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CN115789985A - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
CN115789985A
CN115789985A CN202211515797.XA CN202211515797A CN115789985A CN 115789985 A CN115789985 A CN 115789985A CN 202211515797 A CN202211515797 A CN 202211515797A CN 115789985 A CN115789985 A CN 115789985A
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CN
China
Prior art keywords
temperature
value
air conditioner
temperature sensor
condition
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Pending
Application number
CN202211515797.XA
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Chinese (zh)
Inventor
邹海如
朱磊
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Hisense Guangdong Air Conditioning Co Ltd
Original Assignee
Hisense Guangdong Air Conditioning Co Ltd
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Application filed by Hisense Guangdong Air Conditioning Co Ltd filed Critical Hisense Guangdong Air Conditioning Co Ltd
Priority to CN202211515797.XA priority Critical patent/CN115789985A/en
Publication of CN115789985A publication Critical patent/CN115789985A/en
Pending legal-status Critical Current

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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an air conditioner, comprising: a refrigerant circulation circuit; a compressor; an outdoor heat exchanger and an indoor heat exchanger; a four-way valve; a first temperature sensor for detecting a temperature of a top of the compressor; a second temperature sensor for detecting a temperature at a discharge port of the compressor; a controller configured to perform a discharge control operation on the compressor, including: and after the expansion valve is controlled to operate at a fixed opening degree for a first preset time period, controlling the adjusting time of the opening degree of the expansion valve according to the difference value of the temperature value of the first temperature sensor and the temperature value of the second temperature sensor, so that the temperature value of the first temperature sensor or the temperature value of the second temperature sensor is equal to or approximately equal to the target exhaust temperature of the compressor. The air conditioner can effectively control the actual exhaust temperature of the compressor, and can truly realize the target exhaust temperature of the compressor, thereby ensuring that the air conditioner is efficiently and stably carried out.

Description

Air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner.
Background
During operation of an air conditioner, it is important to accurately control the compressor discharge temperature. The discharge temperature of the compressor is the temperature of the discharge gas after the compressor compresses the gaseous refrigerant, and the discharge temperature can be changed along with different working conditions of the compressor and the like. When the air conditioner adjusts the indoor temperature, the target discharge temperature of the compressor is different based on different working conditions of the air conditioner, such as different ambient temperatures, different frequencies of the compressor, and the like. In order for an air conditioner to operate efficiently under different operating conditions, it is necessary to adjust the compressor discharge temperature in time to be equal or approximately equal to the target discharge temperature of the compressor. Adjusting the compressor discharge temperature to be equal to or approximately equal to the target discharge temperature of the compressor may ensure efficient and stable operation of the air conditioner under the respective operating conditions.
A conventional way of adjusting the discharge temperature of the compressor is to install a discharge temperature sensor at a discharge pipe of the compressor to obtain the discharge temperature at the time of operation of the compressor, and adjust the discharge temperature to be equal to or approximately equal to a target discharge temperature based on the obtained discharge temperature. However, under the conditions of insufficient refrigerant quantity and/or too small opening degree of the expansion valve of the air conditioner, the exhaust temperature sensor may be greatly influenced by the external environment temperature and cannot reflect the exhaust temperature really, so that the exhaust temperature of the compressor is acquired incorrectly, the exhaust temperature of the compressor cannot be controlled really and effectively, the target exhaust temperature of the compressor cannot be realized really, and the air conditioner cannot be guaranteed to be performed efficiently and stably.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide an air conditioner, which can effectively collect the actual exhaust temperature of the compressor, can truly realize the target exhaust temperature of the compressor, and further ensure that the air conditioner can be efficiently and stably operated.
An air conditioner according to an embodiment of the present invention includes: the refrigerant circulation loop is used for circulating the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator and the four-way valve; the compressor is used for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser for working; an outdoor heat exchanger and an indoor heat exchanger, one of which operates as a condenser and the other of which operates as an evaporator; the four-way valve is used for controlling the flow direction of refrigerant in the refrigerant circulation loop so as to switch the outdoor heat exchanger and the indoor heat exchanger between the condenser and the evaporator; a first temperature sensor for detecting a temperature of a top of the compressor; a second temperature sensor for detecting a temperature at a discharge port of the compressor; a controller configured to perform a discharge control operation on the compressor, including: after the expansion valve is controlled to operate at a fixed opening degree for a first preset time period, controlling the adjusting time of the opening degree of the expansion valve according to the difference value of the temperature value of the first temperature sensor and the temperature value of the second temperature sensor, so that the temperature value of the first temperature sensor or the temperature value of the second temperature sensor is equal to or approximately equal to the target exhaust temperature of the compressor.
Therefore, according to the air conditioner provided by the embodiment of the invention, the first temperature sensor for detecting the temperature at the top of the compressor and the second temperature sensor for detecting the temperature at the exhaust port of the compressor are arranged, and the controller is configured to control the adjustment time of the opening degree of the expansion valve according to the difference value between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor after the expansion valve is operated at the fixed opening degree for the first preset time period, so that the temperature value of the first temperature sensor or the temperature value of the second temperature sensor is equal to or approximately equal to the target exhaust temperature of the compressor, the actual exhaust temperature of the compressor can be truly reflected, the erroneous collection of the actual exhaust temperature of the compressor is avoided, the effective control of the actual exhaust temperature of the compressor is further realized, the actual exhaust temperature of the compressor is truly equal to or approximately equal to the target exhaust temperature of the compressor, and the air conditioner is further ensured to be efficiently and stably performed.
According to some embodiments of the invention, the controller is specifically configured to: if the absolute value of the difference between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor is equal to or lower than a first preset temperature difference value, adjusting the opening degree of the expansion valve at a first time interval according to the difference between the temperature value of the second temperature sensor and the target exhaust temperature, so that the temperature value of the second temperature sensor is equal to or approximately equal to the target exhaust temperature of the compressor; if the absolute value is between the first preset temperature difference value and a second preset temperature difference value, adjusting the opening degree of the expansion valve at a second time interval according to the difference between the target exhaust temperature and the average value of the temperature values of the first temperature sensor and the second temperature sensor, so that the temperature value of the first temperature sensor is equal to or approximately equal to the target exhaust temperature of the compressor, wherein the second preset temperature difference value is greater than the first preset temperature difference value; and if the absolute value is higher than or equal to the second preset temperature difference value, adjusting the opening degree of the expansion valve at a third time interval according to the difference between the temperature value of the first temperature sensor and the target exhaust temperature, so that the temperature value of the first temperature sensor is equal to or approximate to the target exhaust temperature of the compressor.
According to some embodiments of the invention, the second time interval is 1.5 times the first time interval and the third time interval is 2 times the first time interval.
According to some embodiments of the invention, the controller is configured to: after the expansion valve is controlled to operate at a fixed opening degree for the first preset time period, judging whether the temperature value of the first temperature sensor is greater than a first preset temperature value or not; if the judgment result is negative, controlling the adjusting time of the opening degree of the expansion valve according to the absolute value of the difference value of the temperature value of the first temperature sensor and the temperature value of the second temperature sensor; and if so, controlling the compressor to stop running and reporting the refrigerant leakage fault.
According to some embodiments of the invention, the air conditioner further comprises: a first cut-off valve connected between the four-way valve and one end of the indoor heat exchanger; a second cut-off valve connected between the other end of the indoor heat exchanger and the expansion valve; the controller is further configured to determine whether the first and second cutoff valves are opened according to a difference value between the temperature value of the first temperature sensor, and the temperature value of the second temperature sensor after controlling the air conditioner to operate for a second preset time period.
According to some embodiments of the invention, the control device is configured to determine whether the first and second stop valves are open by: judging whether the air conditioner meets a first condition and a second condition, wherein the first condition is that the temperature value of the first temperature sensor is lower than or equal to a second preset temperature value, and the second condition is that the difference value is lower than or equal to a third preset temperature difference value; if the air conditioner meets the first condition and does not meet the second condition, controlling the opening degree of the expansion valve to increase; after the air conditioner is operated for a first time period under the condition that the opening degree of the expansion valve is increased, judging whether the air conditioner meets the first condition, the second condition and a third condition, wherein the third condition is that the difference value between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor is lower than or equal to a fourth preset temperature difference value, and the fourth preset temperature difference value is larger than the third preset temperature difference value; and if the air conditioner does not meet the first condition and/or the third condition, controlling the compressor to stop running and reporting a system fault.
According to some embodiments of the invention, the controller is further specifically configured to determine whether the first and second shut-off valves are open by: if the air conditioner meets the first condition, the second condition and the third condition, determining that the first stop valve and the second stop valve are both opened and quitting the operation of judging whether the first stop valve and the second stop valve are opened; if the air conditioner meets the first condition and the third condition and does not meet the second condition, controlling the compressor to continuously operate for a second time period, acquiring a temperature value of the first temperature sensor, a temperature value of the second temperature sensor and a difference value between the temperature values after the second time period, and judging whether the air conditioner meets the first condition and the second condition; if the air conditioner does not meet the first condition or meets the first condition but does not meet the second condition, controlling the compressor to stop running and reporting a system fault; and if the air conditioner meets the first condition and the second condition, determining that the first stop valve and the second stop valve are both opened and quitting the operation of judging whether the first stop valve and the second stop valve are opened.
According to some embodiments of the invention, the controller is further configured to perform an operation of determining whether the air conditioner has refrigerant leakage, including: after controlling the compressor to continuously run for a third preset time period, obtaining a temperature value of the first temperature sensor and a temperature value of the second temperature sensor, recording a difference value between the temperature values, and judging whether the air conditioner meets a fourth condition and a fifth condition, wherein the fourth condition is that the temperature value of the first temperature sensor is not greater than a third preset temperature value, and the fifth condition is that the temperature difference value is not greater than a fifth preset temperature difference value; if the air conditioner meets the fourth condition and does not meet the fifth condition, controlling the compressor to continue to operate for a fourth preset time period, acquiring the temperature value of the first temperature sensor and the temperature value of the second temperature sensor after the fourth preset time period, recording the difference value between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor, and judging whether the air conditioner meets the fourth condition and the fifth condition; if the air conditioner meets the fourth condition and does not meet the fifth condition, controlling the opening degree of the expansion valve to increase, and after the air conditioner runs for a third time period under the condition that the opening degree of the expansion valve is increased, judging whether the air conditioner meets the fourth condition and the fifth condition; if the air conditioner meets the fourth condition but does not meet the fifth condition, controlling the compressor to stop running and reporting a refrigerant leakage fault; if the air conditioner does not meet the fourth condition, controlling the compressor to stop running and reporting a refrigerant leakage fault; and if the air conditioner meets the fourth condition and the fifth condition, judging that the air conditioner does not leak the refrigerant and quitting the operation of judging whether the air conditioner leaks the refrigerant.
According to some embodiments of the invention, the controller is configured to: sequentially performing the operation of judging whether the first stop valve and the second stop valve are opened and the operation of judging whether the air conditioner leaks the refrigerant; and when the exhaust control operation performed on the compressor conflicts with the operation of judging whether the first stop valve and the second stop valve are opened, continuing the operation of judging whether the first stop valve and the second stop valve are opened, temporarily interrupting the exhaust control operation performed on the compressor, and after the conflict disappears, re-performing the operation of controlling the adjustment time of the opening degree of the expansion valve according to the difference value of the temperature value of the first temperature sensor and the temperature value of the second temperature sensor; or when the exhaust control operation performed on the compressor conflicts with the operation for judging whether the air conditioner leaks the refrigerant, continuing the operation for judging whether the air conditioner leaks the refrigerant, temporarily interrupting the exhaust control operation on the compressor, and after the conflict disappears, re-performing the operation for controlling the adjusting time of the opening degree of the expansion valve according to the difference value between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor.
According to some embodiments of the invention, the temperature probe of the first temperature sensor is a steel piece and the temperature probe of the second temperature sensor is a copper piece.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
fig. 1 is a schematic view of a conventional air conditioner.
Fig. 2 is a schematic structural block diagram of an air conditioner according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of an air conditioner according to an embodiment of the present invention.
Fig. 4 is a structural view of a portion of an outdoor unit of an air conditioner according to an embodiment of the present invention.
Fig. 5 is a schematic operation flow diagram of a discharge control operation of a compressor by a controller of an air conditioner according to an embodiment of the present invention.
Fig. 6 is a schematic operation flow diagram of a controller of an air conditioner according to an embodiment of the present invention for determining whether first and second cutoff valves are opened.
Fig. 7 is a schematic operation flow diagram of the controller of the air conditioner for determining whether refrigerant leakage occurs in the air conditioner according to the embodiment of the present invention.
Reference numerals:
an air conditioner 1000; a refrigerant circulation circuit 10; a compressor 20; an expansion valve 30; a four-way valve 40; an outdoor heat exchanger 50; an indoor heat exchanger 60; a first temperature sensor 70; a second temperature sensor 80; a controller 90; a first cut-off valve 101; and a second shut-off valve 102.
Detailed Description
Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary.
Fig. 1 is a schematic view of an air conditioner, the basic structure of which can be understood in conjunction with fig. 1, in which the air conditioner performs a cooling/heating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. Wherein the refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies a refrigerant to the air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat exchange with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a system cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
An air conditioner according to some embodiments of the present application includes an air conditioner indoor unit installed in an indoor space. The indoor unit, i.e., the indoor unit, is connected to an outdoor unit, i.e., the outdoor unit, installed in an outdoor space through a pipe. The outdoor unit of the air conditioner may be provided with a compressor, an outdoor heat exchanger, an outdoor fan, an expander and the like for system circulation, and the indoor unit of the air conditioner may be provided with an indoor heat exchanger and an indoor fan.
An air conditioner 1000 according to an embodiment of the present invention is described below with reference to fig. 2 to 7.
As shown in fig. 2 to 4, the air conditioner 1000 according to the embodiment of the present invention includes a refrigerant circulation circuit 10, a compressor 20, an outdoor heat exchanger 50, an indoor heat exchanger 60, and a four-way valve 40. One of the outdoor heat exchanger 50 and the indoor heat exchanger 60 operates as a condenser, and the other operates as an evaporator. The refrigerant circulation circuit 10 circulates a refrigerant in a circuit including a compressor 20, a condenser, an expansion valve 30, an evaporator, and a four-way valve 40. The four-way valve 40 controls the flow direction of the refrigerant in the refrigerant circulation circuit 10 so that the exterior heat exchanger 50 and the interior heat exchanger 60 are switched between operating as a condenser and an evaporator.
The air conditioner 1000 further includes a first temperature sensor 70 and a second temperature sensor 80, wherein the first temperature sensor 70 is used for detecting the temperature at the top of the compressor 20, and the second temperature sensor 80 is used for detecting the temperature at the discharge port of the compressor 20.
The air conditioner 1000 further includes a controller 90. The controller 90 may be a Processor with data Processing and analyzing functions, such as a Central Processing Unit (CPU) in the air conditioner 1000, and the like, and the controller 90 may include a monitoring Unit, a determining Unit, a control Unit, and the like for Processing and analyzing data. The controller 90 is configured to perform a discharge control operation on the compressor 20, including: after controlling the expansion valve 30 to operate at a fixed opening degree for a first preset time period, the adjustment time of the opening degree of the expansion valve 30 is controlled according to the difference between the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80 so that the temperature value of the first temperature sensor 70 or the temperature value of the second temperature sensor 80 is equal to or approximately equal to the target discharge temperature of the compressor 20. It is understood that the target discharge air temperature of the compressor 20 is different under different operating parameters and different environmental parameters of the air conditioner 1000. The method for obtaining the target discharge temperature of the compressor 20 is not limited in the present invention, for example, the target discharge temperature of the compressor 20 may be known or calculated according to the operation parameters and the environmental parameters of the air conditioner 1000, which are all included in the scope of the present invention, and the present invention is not described in detail herein.
Specifically, referring to fig. 3-5, a first temperature sensor 70 may be provided at the top of the compressor 20 to measure the temperature at the top of the compressor 20; a second temperature sensor 80 may be provided on the discharge line of the compressor 20 to measure the compressor20 at the exhaust port. The controller 90 may acquire the temperature value TT of the first temperature sensor 70 after controlling the expansion valve 30 to operate at the fixed opening degree for a first preset time period (as shown in S1 of fig. 5) 1 And temperature value TP of second temperature sensor 80 1 Difference value TT between 1 -TP 1 (as shown in S2 of fig. 5). For example, the controller 90 may start the compressor 20 after receiving a start instruction to turn on the heating or cooling mode of the air conditioner 1000 (as indicated by S0 of fig. 5), and then control the expansion valve 30 to operate at a fixed opening degree. The controller 90 acquires the temperature value TT of the first temperature sensor 70 after controlling the expansion valve 30 to operate at a fixed opening degree for a first preset time period 1 And temperature value TP of second temperature sensor 80 1 Difference value TT between 1 -TP 1 . The first preset time period is self-defined, for example, the first preset time period is 7 minutes, 8 minutes, 9 minutes, and the like, but is not limited thereto. Optionally, the first preset time period is 8 minutes.
The controller 90 is obtaining the temperature value TT of the first temperature sensor 70 1 And temperature value TP of second temperature sensor 80 1 Difference of (TT) 1 -TP 1 Then, according to the difference TT 1 -TP 1 The adjustment time of the opening degree of the expansion valve 30 is controlled so that the temperature value of the first temperature sensor 70 or the temperature value of the second temperature sensor 80 is equal to or approximately equal to the target discharge temperature T of the compressor 20 Target . Specifically, the thermal conductivity of the temperature probe of the second temperature sensor 80 is better than that of the temperature probe of the first temperature sensor 70, so that the temperature sensing speed of the second temperature sensor 80 is high, and the temperature sensor can quickly respond to the temperature change at the air outlet of the compressor 20 and provide an accurate temperature value in a short time; however, when the refrigerant is insufficient and/or the opening degree of the expansion valve 30 is excessively small, the temperature value of the second temperature sensor 80 may not reflect the actual discharge temperature of the compressor 20. On the other hand, since the thermal conductivity of the temperature probe of the first temperature sensor 70 is inferior to that of the temperature probe of the second temperature sensor 80, the temperature sensing speed of the first temperature sensor 70 is relatively slow, and the response to the temperature change is relatively delayed, but the temperature measurement stability is excellent, and the air conditioner is provided with the temperature sensorIn the device 1000, when the refrigerant is insufficient and/or the opening degree of the expansion valve 30 is excessively small, the actual discharge temperature of the compressor 20 can be relatively accurately indicated. Therefore, when the air conditioner 1000 is in a state of insufficient refrigerant or the opening degree of the expansion valve 30 is too small, the temperature value TP of the second temperature sensor 80 is set 1 May be significantly lower than the actual discharge temperature of the compressor 20, the temperature value TT of the first temperature sensor 70 1 Temperature value TP of the second temperature sensor 80 1 Difference value TT between 1 -TP 1 May be significant, at which time the temperature value TT of the first temperature sensor 70 1 The actual discharge temperature of the compressor 20 can be relatively accurately reflected so that the controller 90 follows the temperature value TT of the first temperature sensor 70 1 Equal or approximately equal to the target discharge temperature T of the compressor 20 Target The opening degree of the expansion valve 30 is adjusted and the expansion valve 30 is adjusted at a longer time interval (i.e., the time interval between two consecutive adjustments of the expansion valve 30 is longer) because the response speed of the first temperature sensor 70 to the temperature change is slow. In contrast, the temperature value TT at the first temperature sensor 70 1 Temperature value TP associated with second temperature sensor 80 1 Difference value TT between 1 -TP 1 When the temperature is not significant, it indicates that the air conditioner 1000 is not in shortage of refrigerant and/or the opening degree of the expansion valve 30 is too small, and the temperature value TP of the second temperature sensor 80 is obtained at this time because the response speed of the second temperature sensor 80 to the temperature change is fast 1 Can be considered to actually reflect the actual discharge temperature of the compressor 20, the controller 90 follows the temperature value TP of the second temperature sensor 80 1 Equal or approximately equal to the target discharge temperature T of the compressor 20 Target The opening degree of the expansion valve 30 is adjusted and the expansion valve 30 is adjusted at shorter time intervals (i.e., the time interval between two consecutive adjustments of the expansion valve 30 is shorter) due to the fast response speed of the second temperature sensor 80 to temperature changes.
The air conditioner in the prior art adopts a strategy of controlling the exhaust of the compressor, in which a temperature sensor is only arranged on an exhaust pipe of the compressor, and the opening degree of the expansion valve 30 is controlled according to the comparison result of the target exhaust temperature and the temperature value of the temperature sensor, so as to finally realize the temperature value and the target temperature valueThe target exhaust temperature is equal, wherein, even if the air conditioner has insufficient refrigerant and/or insufficient opening degree of the expansion valve, the temperature value of the temperature sensor is used as the actual exhaust temperature of the compressor. In contrast, the air conditioner 1000 of the present invention may determine whether the air conditioner 1000 has a refrigerant shortage and/or an insufficient opening degree of the expansion valve 30 by using the two temperature sensors to measure the temperature at the top of the compressor 20 and the temperature at the discharge port of the compressor 20, respectively, according to the difference between the two temperature sensors, so as to flexibly select the temperature value of the two temperature sensors, which is more capable of reflecting the actual discharge temperature of the compressor 20, as the actual discharge temperature of the compressor 20, and adjust the opening degree of the expansion valve 30 at a proper time interval according to the difference, so as to realize the temperature value which is more capable of reflecting the actual discharge temperature of the compressor 20 and the target discharge temperature T of the compressor 20 Target Equal or approximately equal. It can be seen that the air conditioner 1000 of the present application can implement that, in the process of controlling the exhaust of the compressor 20, the actual exhaust temperature of the compressor 20 can be truly reflected, thereby avoiding the erroneous acquisition of the actual exhaust temperature of the compressor 20, further implementing the effective control of the actual exhaust temperature of the compressor 20, and being capable of realistically implementing the target exhaust temperature T of the compressor 20 Target Thereby ensuring efficient and stable operation of the air conditioner 1000.
Therefore, according to the air conditioner 1000 of the embodiment of the present invention, by providing the first temperature sensor 70 for detecting the temperature at the top of the compressor 20 and the second temperature sensor 80 for detecting the temperature at the exhaust port of the compressor 20, and configuring the controller 90 to control the adjustment time of the opening degree of the expansion valve 30 according to the difference between the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80 after the expansion valve 30 is operated at the fixed opening degree for the first preset time period, so that the temperature value of the first temperature sensor 70 or the temperature value of the second temperature sensor 80 is equal to or approximately equal to the target exhaust temperature of the compressor 20, the actual exhaust temperature of the compressor 20 can be truly reflected, thereby avoiding the erroneous collection of the actual exhaust temperature of the compressor 20, and thus achieving effective control of the actual exhaust temperature of the compressor 20, and being able to truly achieve that the actual exhaust temperature of the compressor 20 is equal to or approximately equal to the target exhaust temperature of the compressor 20, and thus ensuring that the air conditioner 1000 is efficiently and stably performed.
According to a further embodiment of the present invention, referring to fig. 5, the controller 90 is specifically configured to:
if the temperature value TT of the first temperature sensor 70 1 Temperature value TP associated with second temperature sensor 80 1 Difference value TT between 1 -TP 1 Is equal to or lower than the first preset temperature difference value, according to the temperature value TP of the second temperature sensor 80 1 And target exhaust temperature T Target Difference value TP of 1 -T Target To adjust the opening degree of the expansion valve 30 at first time intervals so that the temperature value TT of the second temperature sensor 80 1 Equal or approximately equal to the target discharge temperature T of the compressor 20 Target (as shown in S4 and S41);
if the absolute value is between the first preset temperature difference value and the second preset temperature difference value, the temperature value TT of the first temperature sensor 70 is determined 1 And temperature value TP of second temperature sensor 80 1 Average value of (TT) 1 +TP 1 ) /2 and target exhaust temperature T Target Difference between (TT) 1 +TP 1 )/2-T Target To adjust the opening degree of the expansion valve 30 at the second time interval so that the temperature value TT of the first temperature sensor 80 1 Equal or approximately equal to the target discharge temperature T of the compressor 20 Target Wherein the second preset temperature difference value is greater than the first preset temperature difference value (as shown in S4 and S42);
if the absolute value is higher than or equal to a second preset temperature difference value, the temperature value TT of the first temperature sensor 70 is determined 1 And target exhaust temperature T Target Difference of (TT) 1 -T Target To adjust the opening degree of the expansion valve 30 at the third time interval so that the temperature value TT of the first temperature sensor 70 1 Equal to the target discharge temperature T of the compressor 20 Target (as shown in S4 and S43).
Specifically, the controller 90 determines the temperature value TT of the first temperature sensor 70 1 Temperature value TP associated with second temperature sensor 80 1 Difference value TT between 1 -TP 1 Is equal to or lower than the first preset temperature difference value, it indicates the temperature value TP of the second temperature sensor 80 1 Can be considered to actually reflect the actual discharge temperature of the compressor 20, the temperature value TP of the second temperature sensor 80 can be used 1 And target exhaust temperature T Target Difference value TP of 1 -T Target The opening degree of the expansion valve 30 is adjusted at first time intervals to finally realize the temperature value TP of the second temperature sensor 80 1 Equal or approximately equal to the target discharge temperature T of the compressor 20 Target . Optionally, the first preset temperature difference value is 5 ℃. Of course, the first preset temperature difference value can also be set to other values, such as 4 ℃ or 6 ℃. Optionally, the first time interval is 90 seconds. Of course, the present invention is not limited thereto, and the first time interval may also be considered to be other values, such as 80 seconds, 85 seconds, 100 seconds, 105 seconds, and the like.
Alternatively, the controller 90 determines the temperature value TT of the first temperature sensor 70 1 Temperature value TP of the second temperature sensor 80 1 Difference value TT between 1 -TP 1 When the absolute value of (a) is between the first preset temperature difference value and the second preset temperature difference value, it indicates that the air conditioner 1000 may have insufficient refrigerant and/or insufficient opening degree of the expansion valve 30, and the temperature value TP of the second temperature sensor 80 1 The accuracy of the actual discharge temperature of the compressor 20 is influenced to a certain extent, and the actual discharge temperature of the compressor 20 cannot be reflected particularly accurately by the hysteresis of the response of the first temperature sensor 70 to the temperature change, and at this time, the temperature value TT of the first temperature sensor 70 1 And temperature value TP of second temperature sensor 80 1 Can relatively accurately reflect the actual discharge temperature of the compressor 20, the controller 90 thus calculates the temperature value TT of the first temperature sensor 70 1 And temperature value TP of second temperature sensor 80 1 Average value of (TT) 1 +TP 1 ) /2 and target exhaust temperature T Target Difference between (TT) 1 +TP 1 )/2-T Target To adjust the opening degree of the expansion valve 30 at a second time interval, wherein the second predetermined temperature difference is greater than the first predetermined temperature differenceThe value is obtained. Optionally, the second preset temperature difference value is 10 ℃. Of course, the second predetermined temperature difference value may be set to other values, such as 9 ℃ or 11 ℃. For example, the first preset temperature difference value is 5 ℃ and the second preset temperature difference value is 10 ℃. Optionally, the second time interval is greater than the first time interval.
Still alternatively, the controller 90 determines the temperature value TT of the first temperature sensor 70 1 Temperature value TP of the second temperature sensor 80 1 Difference value TT between 1 -TP 1 When the absolute value of (a) is equal to or higher than the second preset temperature difference value, it indicates that there is a significant temperature difference between the first temperature sensor 70 and the second temperature sensor 80, the air conditioner 1000 has a refrigerant shortage and/or an opening degree of the expansion valve 30 is insufficient, and the temperature value TP of the second temperature sensor 80 1 The actual discharge temperature of the compressor 20 is greatly influenced by the external environment and cannot be reflected at all really, but the first temperature sensor 70 is not influenced by the external environment significantly because of the hysteresis of the temperature change thereof, so the temperature value TT of the first temperature sensor 70 1 Can be considered to relatively accurately reflect the actual discharge temperature of the compressor 20, the controller 90 is therefore responsive to the temperature value TT of the first temperature sensor 70 1 And target exhaust temperature T Target Difference TT of 1 -T Target To adjust the opening degree of the expansion valve 30 at the third time interval.
Optionally, the second time interval is 1.5 times the first time interval and the third time interval is 2 times the first time interval. Specifically, according to the temperature value TP of the second temperature sensor 80 1 And target exhaust temperature T Target Difference value TP of 1 -T Target When the opening degree of the expansion valve 30 is adjusted, since the second temperature sensor 80 can respond quickly to a temperature change, a time interval between two consecutive adjustments of the opening degree of the expansion valve 30 can be short (i.e., a first time interval); according to the temperature value TT of the first temperature sensor 70 1 And target exhaust temperature T Target Difference of (TT) 1 -T Target When the opening degree of the expansion valve 30 is adjusted, since the first temperature sensor 70 has a certain hysteresis in response to a temperature change, the opening degree of the expansion valve 30 is adjusted twice in successionThe time interval may be longer (i.e., the third time interval); based on a similar principle, according to the temperature value TT of the first temperature sensor 70 1 And temperature value TP of second temperature sensor 80 1 Average value of (TT) 1 +TP 1 ) /2 and target exhaust temperature T Target Difference value (TT) therebetween 1 +TP 1 )/2-T Target When the opening degree of the expansion valve 30 is adjusted, a time interval between two consecutive adjustments of the opening degree of the expansion valve 30 (i.e., a second time interval) may be between the first time interval and the second time interval. So configured, the temperature value TP according to the second temperature sensor 80 can be obtained 1 And target exhaust temperature T Target Difference value TP of 1 -T Target Adjusting the opening degree of the expansion valve 30 in accordance with the temperature value TT of the first temperature sensor 70 1 And temperature value TP of second temperature sensor 80 1 Average value of (TT) 1 +TP 1 ) /2 and target exhaust temperature T Target Difference value (TT) therebetween 1 +TP 1 )/2-T Target Adjusting the opening degree of the expansion valve 30 according to the temperature value TT of the first temperature sensor 70 1 And target exhaust temperature T Target Difference of (TT) 1 -T Target When the opening degree of the expansion valve 30 is adjusted, appropriate time intervals for adjusting the opening degree of the expansion valve 30 are selected, so that the opening degree of the expansion valve 30 is prevented from being adjusted too frequently, and the opening degree of the expansion valve 30 is prevented from being adjusted in time.
It is understood that the controller 90 can control the temperature TP of the second temperature sensor 80 1 And target exhaust temperature T Target Difference value TP of 1 -T Target To adjust the opening degree of the expansion valve 30 at first time intervals, according to the temperature value TT of the first temperature sensor 70 1 And temperature value TP of second temperature sensor 80 1 Average value of (TT) 1 +TP 1 ) /2 and target exhaust temperature T Target Difference between (TT) 1 +TP 1 )/2-T Target To adjust the opening degree of the expansion valve 30 at second time intervals or in accordance with the temperature value TT of the first temperature sensor 70 1 And target exhaust temperature T Target Difference of (TT) 1 -T Target To adjust the expansion valve 30 at a third time intervalThe temperature value TT of the first temperature sensor 70 is acquired again each time the opening degree of the expansion valve 30 is adjusted 1 And temperature value TP of second temperature sensor 80 1 And the difference between the two TT 1 -TP 1 And according to the difference TT 1 -TP 1 The adjustment time of the opening degree of the expansion valve 30 is controlled again until the temperature value of the first temperature sensor 70 or the second temperature sensor 80, which is selected to more truly represent the actual discharge temperature of the compressor 20, is equal to or approximately equal to the target discharge temperature of the compressor 20.
Further, referring to fig. 5, the controller 90 is further configured to: after the expansion valve 30 is controlled to operate at a fixed opening degree for a first preset time period, the temperature value TT of the first temperature sensor 70 is first judged 1 Whether the temperature is larger than a first preset temperature value or not;
if the judgment result is no, the temperature value TT of the first temperature sensor 70 is judged 1 And temperature value TP of second temperature sensor 80 1 Difference of (TT) 1 -TP 1 The absolute value of the opening degree of the expansion valve 30;
if yes, the compressor 20 is controlled to stop running, and a refrigerant leakage fault is reported.
Specifically, the controller 90 first determines the temperature value TT of the first temperature sensor 70 after controlling the expansion valve 30 to operate at a fixed opening degree for a first preset time period (as indicated by S1 in fig. 5), in other words, before performing discharge temperature control on the compressor 20 1 Whether it is greater than a first preset temperature value. The first preset temperature value is an upper limit value of the operating temperature of the compressor 20, and in order to ensure that the compressor 20 operates normally and avoid damage to the compressor 20, it is necessary to ensure that the compressor 20 operates at a temperature not higher than the first preset temperature value. Optionally, the first preset temperature value is 115 ℃, although the invention is not limited thereto. Before the discharge temperature control of the compressor 20, the temperature value TT of the first temperature sensor 70 is detected 1 I.e., whether the top temperature of the compressor 20 exceeds the first preset temperature value, it can be determined whether the compressor 20 is in a safety bar not higher than the first preset temperature value, i.e., the upper limit value of the operating temperatureWork under the piece. In detail, the controller 90 determines the temperature value TT of the first temperature sensor 70 1 If the temperature is not higher than the first preset temperature, the compressor 20 is considered to be operated under a safe condition, and the temperature TT is determined according to the temperature of the first temperature sensor 70 1 And temperature value TP of second temperature sensor 80 1 Difference TT of 1 -TP 1 The absolute value of the expansion valve 30 to control the operation of the adjustment time of the opening degree of the expansion valve 30 to perform the discharge temperature control of the compressor 20. Instead, the controller 90 detects the temperature value TT of the first temperature sensor 70 1 When the first preset temperature value is exceeded, it is considered that the top temperature of the compressor 20 is excessively high and this phenomenon may be caused by insufficient refrigerant due to refrigerant leakage, and the controller 90 controls the compressor 20 to stop operating and reports a refrigerant leakage failure (as shown in S3 and S31 of fig. 5) to prevent the compressor 20 from being damaged.
According to some embodiments of the present invention, referring to fig. 3, the air conditioner 1000 further includes a first cut-off valve 101 and a second cut-off valve 102, the first cut-off valve 101 being connected between the four-way valve 40 and one end of the indoor heat exchanger 60, and the second cut-off valve 102 being connected between the other end of the indoor heat exchanger 60 and the expansion valve 30. In other words, the first stop valve 101 is a low-pressure valve of the air conditioner 1000, and the second stop valve 102 is a high-pressure valve of the air conditioner 1000. When the air conditioner 1000 is in a normal operation state, both the high pressure valve and the low pressure valve of the air conditioner 1000 should be in an open state, so that the refrigerant is normally circulated between the indoor unit and the outdoor unit of the air conditioner 1000. Therefore, it is important to determine whether the first cut valve 101 (i.e., the low pressure valve) and the second cut valve 102 (i.e., the high pressure valve) are normally opened to determine whether the air conditioner 1000 is normally operated.
Referring to fig. 3 in conjunction with fig. 6, the controller 90 is also configured to perform an operation of determining whether the first and second cutoff valves 101 and 102 of the air conditioner 1000 are open. Specifically, the controller 90 is further configured to control the air conditioner 1000 to operate for a second preset time period (as shown by S1' in fig. 6) and then to control the temperature value TT according to the first temperature sensor 70 2 Temperature value TT of first temperature sensor 70 2 And temperature value TP of second temperature sensor 80 2 Difference of (2)TT 2 -TP 2 To determine whether the first and second cutoff valves 101 and 102 are open. In other words, the controller 90 may acquire the temperature value TT of the first temperature sensor 70 after controlling the air conditioner 1000 to operate for a second preset time period (e.g., 2 minutes, but not limited thereto) (as shown by S1 'in fig. 6) after receiving a cooling or heating on command of the air conditioner 1000 and controlling the compressor 20 to start (as shown by S0' in fig. 6) 2 And temperature value TP of second temperature sensor 80 2 And temperature value TT of first temperature sensor 70 2 And temperature value TP of second temperature sensor 80 2 Difference value TT between 2 -TP 2 (as shown by S5' in fig. 6), according to the temperature value TT of the first temperature sensor 70 2 And a temperature value TT of the first temperature sensor 70 2 And temperature value TP of second temperature sensor 80 2 Difference value TT between 2 -TP 2 To determine whether the first cut valve 101 (i.e., the low pressure valve) and the second cut valve 102 (i.e., the high pressure valve) are open.
When both the first and second cutoff valves 101 and 102 are opened, refrigerant circulates between the indoor unit and the outdoor unit of the air conditioner 1000, and the temperature value TT of the first temperature sensor 70 2 Should not be too high, and the temperature value TT of the first temperature sensor 70 2 And temperature value TP of second temperature sensor 80 2 Difference value TT between 2 -TP 2 And will not be significant. In contrast, when at least one of the first and second cutoff valves 101 and 102 is not normally opened, the refrigerant is not circulated before the indoor and outdoor units of the air conditioner 1000, but the compressor 20 is always operated and the temperature continues to be increased due to heat generated from the operation, and thus the temperature value TT measured by the first temperature sensor 70 provided at the top of the compressor 20 2 Higher; and a temperature value TP measured by a second temperature sensor 80 provided at a discharge pipe of the compressor 20 when the refrigerant is not circulated 2 Is greatly influenced by the external environment and may be at a low value, so the temperature value TT of the first temperature sensor 70 2 And temperature value TP of second temperature sensor 80 2 Difference value TT between 2 -TP 2 May be larger. Thus, utilizing the firstTemperature value TT of temperature sensor 70 2 Temperature value TT of first temperature sensor 70 2 And temperature value TP of second temperature sensor 80 2 The difference between the first and second cut-off valves 101 and 102 can be accurately determined whether to open, so that when it is determined that the first and second cut-off valves 101 and 102 are not normally opened, corresponding protective measures, such as controlling the compressor 20 to stop running, can be taken to prevent the air conditioner 1000 from being damaged.
According to some specific embodiments of the present invention, as shown in fig. 3 and with reference to fig. 6, the controller 90 is specifically configured to determine whether the first and second cutoff valves 101 and 102 are open by:
determining whether the air conditioner 1000 satisfies a first condition (shown as S8 'in fig. 6) and a second condition (shown as S10' in fig. 6), wherein the first condition is that the temperature value of the first temperature sensor 70 is lower than or equal to a second preset temperature value, and the second condition is that the difference value is lower than or equal to a third preset temperature difference value;
if the air conditioner 1000 satisfies the first condition and does not satisfy the second condition, the opening degree of the expansion valve 30 is controlled to be increased (as shown by S12' in fig. 6);
after the air conditioner 1000 is operated for a first period of time (as shown in S13' in fig. 6) with the opening degree of the expansion valve 30 increased, determining whether the air conditioner 1000 satisfies a first condition, a second condition, and a third condition, wherein the third condition is that a difference between a temperature value of the first temperature sensor 70 and a temperature value of the second temperature sensor 80 is lower than or equal to a fourth preset temperature difference value, and the fourth preset temperature difference value is greater than the third preset temperature difference value;
if the air conditioner 1000 does not satisfy the first condition and/or the third condition (as indicated by S15 'in fig. 6), the compressor 20 is controlled to stop operating and a system failure is reported (as indicated by S16' in fig. 6).
For example, the second preset temperature value is the upper limit value of the operating temperature of the compressor 20 when the temperature value TT of the first temperature sensor 70 is 2 If the temperature is higher than the second preset temperature value, the compressor 20 exceeds the maximum temperature for safe operation, and the compressor 20 may be damaged if it continues to operate. E.g. second presetThe temperature value is 115 ℃, but is not limited thereto. The third preset temperature difference value (for example, but not limited to, 7 ℃) is a preset maximum difference value between the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80 when both the first cut-off valve 101 (i.e., the low pressure valve) and the second cut-off valve 102 (i.e., the high pressure valve) of the air conditioner 1000 are properly opened.
Specifically, referring to fig. 6, if the air conditioner 1000 satisfies the first condition (yes as in S8 'of fig. 6) but does not satisfy the second condition (no as in S10' of fig. 6), that is, the temperature value TT of the first temperature sensor 70 2 Lower than or equal to a second preset temperature value (e.g., 115 ℃), and the temperature value TT of the first temperature sensor 70 2 And a temperature value TP of the second sensor 2 Difference value TT between 2 -TP 2 If the temperature difference is greater than the third preset temperature difference value, it is considered that the circulation of the refrigerant in the air conditioner 1000 is blocked, and at least one of the first and second cutoff valves 101 and 102 may not be properly opened. When the air conditioner 1000 satisfies the first condition (yes in S8 'in fig. 6) but does not satisfy the second condition (no in S10' in fig. 6), which may be caused by the opening degree of the expansion valve 30 being too small, the controller 90 may control the opening degree of the expansion valve 30 to increase (e.g., S12 'in fig. 6), e.g., control the opening degree of the expansion valve 30 to be maximum, and acquire the temperature value TT of the first temperature sensor 70 after the air conditioner 1000 is operated for the first period of time (e.g., 2 minutes, but not limited thereto) with the opening degree of the expansion valve 30 increased (as shown in S13' in fig. 6) in order to eliminate the second condition 3 And temperature value TP of second temperature sensor 80 3 And the difference between the two TT 3 -TP 3 (as indicated by S14' in fig. 6), and determines whether the air conditioner 1000 satisfies the first, second, and third conditions to determine whether the first and second cutoff valves 101 and 102 are open. Wherein the third condition is a temperature value TT of the first temperature sensor 70 3 And temperature value TP of second temperature sensor 80 3 Difference of (TT) 3 -TP 3 Less than or equal to a fourth predetermined temperature differential value (e.g., but not limited to 15 c), which is greater than the third predetermined temperature differential value. For exampleThe third preset temperature difference value is 7 ℃, and the fourth preset temperature difference value is 15 ℃.
As shown in S15 'and S16' of fig. 6, if the air conditioner 1000 does not satisfy the first condition, i.e., the temperature value TT of the first temperature sensor 70 3 Above a second preset temperature value (e.g., 115 °), the controller 90 directly controls the compressor 20 to stop operating and reports a system failure; alternatively, if the air conditioner 1000 does not satisfy the third condition, i.e., the temperature value TT of the first temperature sensor 70 3 And temperature value TP of second temperature sensor 80 3 Difference of (TT) 3 -TP 3 If the temperature is higher than the fourth preset temperature difference value, it indicates that at least one of the first stop valve 101 and the second stop valve 102 of the air conditioner 1000 is not opened, the controller 90 controls the compressor 20 to stop operating and reports a system fault; still alternatively, if the air conditioner 1000 does not satisfy the first and third conditions, i.e., the temperature value TT of the first temperature sensor 70 3 A temperature value TT higher than a second preset temperature value (for example 115 °) and of the first temperature sensor 70 3 And temperature value TP of second temperature sensor 80 3 Difference TT of 3 -TP 3 Above the fourth preset temperature difference value, the controller 90 controls the compressor 20 to stop operating and reports a system failure.
Further, the controller 90 is also specifically configured to determine whether the first and second cutoff valves 101 and 102 are open by:
if the air conditioner 1000 satisfies the first condition, the second condition, and the third condition (no in S23 'in fig. 6), it is determined that both the first cut valve and the second cut valve have been opened and the operation of determining whether the first cut valve and the second cut valve are opened is exited (as shown in S25' in fig. 6);
if the air conditioner 1000 satisfies the first condition and the third condition and does not satisfy the second condition (as shown in S17' in fig. 6), controlling the compressor 20 to continue to operate for a second period of time (as shown in S18' in fig. 6) and after the second period of time, acquiring the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80 and the difference therebetween (as shown in S19' in fig. 6), and determining whether the air conditioner 1000 satisfies the first condition (as shown in S20' in fig. 6) and the second condition (as shown in S21' in fig. 6);
if the air conditioner 1000 does not satisfy the first condition (as indicated by "no" of S20' in fig. 6) or satisfies the first condition (as indicated by "yes" of S20' in fig. 6) but does not satisfy the second condition (as indicated by "no" of S21' in fig. 6), controlling the compressor 20 to stop operating and reporting a system failure (as indicated by S23' and S24' in fig. 6);
if the air conditioner 1000 satisfies the first condition (yes in S20' in fig. 6) and the second condition (yes in S21' in fig. 6), it is determined that both the first and second cut valves 101 and 102 have been opened and the operation of determining whether the first and second cut valves 101 and 102 are opened is exited (as indicated by S22' in fig. 6).
Specifically, referring to fig. 3 in conjunction with fig. 6, when the controller 90 determines that the air conditioner 1000 satisfies the first, second, and third conditions, in other words, determines the temperature value TT of the first temperature sensor 70 of the air conditioner 1000 3 Less than or equal to the second preset temperature, and the temperature value TT of the first temperature sensor 70 3 And temperature value TP of second temperature sensor 80 3 Difference value TT between 3 -TP 3 Is lower than or equal to a fourth preset temperature difference value, and the temperature value TT of the first temperature sensor 70 3 And temperature value TP of second temperature sensor 80 3 Difference value TT between 3 -TP 3 When it is lower than or equal to the third preset temperature difference value (as indicated by S23 'in fig. 6), it is determined that both the first and second cut valves 101 and 102 are opened and the operation of determining whether the first and second cut valves 101 and 101 are opened is exited (as indicated by S25' in fig. 6). In this case, further, the controller 90 exits the operation of determining whether the first and second cut valves 101 and 102 are open (as indicated by S25 'in fig. 6) after controlling the air conditioner 1000 to operate for a predetermined period of time (e.g., 5 minutes) when determining that the air conditioner 1000 satisfies the first, second, and third conditions (as indicated by S24' in fig. 6).
When the controller 90 determines that the air conditioner 1000 satisfies the first condition and the third condition, and does not satisfy the second condition, in other words, determines the temperature value TT of the first temperature sensor 70 of the air conditioner 1000 3 Less than or equal to a second preset temperature, and the temperature value TT of the first temperature sensor 70 3 And temperature value TP of second temperature sensor 80 3 Difference value TT between 3 -TP 3 Lower than or equal to the fourth preset temperature difference value, but at the temperature value TT of the first temperature sensor 70 3 And temperature value TP of second temperature sensor 80 3 Difference value TT between 3 -TP 3 Above the third preset temperature difference value (as shown in S17 'of fig. 6), in order to prevent the air conditioner 1000 from entering a stable state sufficient to determine whether the first and second cut-off valves 101 and 102 are open after operating for the first time period with the opening degree of the expansion valve 30 increased, the controller 90 needs to continue to control the compressor 20 to operate for a second time period (for example, 5 minutes, but not limited thereto) (as shown in S18' of fig. 6) to ensure that the air conditioner 1000 enters a stable state in which it can determine whether the first and second cut-off valves 101 and 102 are open. After the second period of time, the controller 90 acquires the temperature value TT of the first temperature sensor 70 4 And temperature value TP of second temperature sensor 80 4 And the difference value TT between the two 4 -TP 4 (as indicated by S19' in fig. 6), and it is determined again whether the air conditioner 1000 satisfies the first condition (as indicated by S20' in fig. 6) and the second condition (as indicated by S21' in fig. 6), i.e., the temperature value TT of the first temperature sensor 70 4 -TP 4 Whether or not it satisfies a temperature value TT lower than or equal to a second preset temperature value and that of the first temperature sensor 70 4 And temperature value TP of second temperature sensor 80 4 Difference value TT between 4 -TP 4 Whether the temperature difference is less than or equal to a third preset temperature difference value is satisfied. If the controller 90 determines that the temperature value TT of the first temperature sensor 70 is not equal to the predetermined value 4 Above a second preset temperature value, the compressor 20 is controlled to stop operating and a system fault is reported (as indicated by S26' in fig. 6). If the controller 90 determines that the temperature value TT of the first temperature sensor 70 is not equal to the predetermined value 4 Not higher than the second preset temperature value (yes in S20' of fig. 6), but the temperature value TT of the first temperature sensor 70 4 And temperature value TP of second temperature sensor 80 4 Difference value TT between 4 -TP 4 Higher than a third predetermined temperature difference (e.g. ofNo in S21 'in fig. 6), it is considered that at least one of the first and second cutoff valves 101 and 102 is not opened, and the compressor 20 is controlled to stop operating and a system failure is reported (as shown in S27' in fig. 6). If the controller 90 determines that the temperature value TT of the first temperature sensor 70 is not equal to the predetermined value 4 Lower than or equal to a second preset temperature value (yes in S20' in fig. 6) and the temperature value TT of the first temperature sensor 70 4 And temperature value TP of second temperature sensor 80 4 The difference therebetween is less than or equal to the third preset temperature difference value (yes in S21 'in fig. 6), it is determined that both the first and second cutoff valves 101 and 102 have been opened and the operation of determining whether the first and second cutoff valves 101 and 102 are open is exited (as indicated by S22' in fig. 6).
Further, referring to fig. 3 in conjunction with fig. 6, in the controller 90 performing the operation of determining whether the first and second cutoff valves 101 and 102 of the air conditioner 1000 are open, the controller 90 is further configured to:
after controlling the air conditioner 1000 to operate for a second preset time period (shown as S1' in fig. 6), the temperature value TT of the first temperature sensor 70 is acquired 1 ' and temperature value TP of the second temperature sensor 80 1 ', and records the temperature value TT of the first temperature sensor 70 1 ' with the temperature value TP of the second temperature sensor 80 1 ' a first difference Δ T1= TT between 1 ’-TP 1 '(as shown by S2' in FIG. 6);
determining whether the air conditioner 1000 satisfies a first condition (as indicated by S3' in fig. 6);
if it is determined that the air conditioner 1000 does not satisfy the first condition (no in S3 'of fig. 6), controlling the compressor 20 to stop and reporting a system failure (as shown in S4' of fig. 6);
if it is determined that the air conditioner 1000 satisfies the first condition (yes in S3' of fig. 6), the air conditioner is controlled to continue for a predetermined period of time, and then the temperature value TT of the first temperature sensor 70 is acquired 2 And temperature value TP of second temperature sensor 80 2 And records the temperature value TT of the first temperature sensor 70 2 Temperature value TP of the second temperature sensor 80 2 Second difference therebetween Δ T2= TT 2 -TP 2 (as shown by S5' in fig. 6);
determining whether Δ T1- Δ T2 is less than or equal to a predetermined threshold (shown as S6' in FIG. 6);
if it is determined that Δ T1- Δ T2 are not less than the predetermined threshold value (no in S6 'in fig. 6), the operation of determining whether the first and second cut valves 101 and 102 are open or not is exited (as shown in S7' in fig. 6).
If it is judged that the Δ T1- Δ T2 is less than the predetermined threshold value (yes in S6' in fig. 6), the above-described operation of judging whether the air conditioner 1000 satisfies the first and second conditions (S8 ' and S10' in fig. 6) is performed.
Therefore, the trend judgment of the exhaust temperature of the compressor can be carried out by utilizing the delta T1-delta T2, so as to avoid the misjudgment caused by slow heat dissipation and slow temperature reduction of the shell of the compressor 20 after the compressor 20 is stopped.
For example, the predetermined threshold is 2 ℃, but is not limited thereto. For example, the predetermined period of time is 4 minutes, but is not limited thereto.
According to some embodiments of the present invention, referring to fig. 3 in combination with fig. 7, the controller 90 is further configured to perform an operation of determining whether the air conditioner 1000 leaks refrigerant, including:
after controlling the compressor 20 to continuously operate for a third preset time period (as shown in S1 "in fig. 7), obtaining the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80 and recording a difference value therebetween (as shown in S2" in fig. 7), and determining whether the air conditioner 1000 satisfies a fourth condition (as shown in S3 "in fig. 7) and a fifth condition (as shown in S5" in fig. 7), the fourth condition being that the temperature value of the first temperature sensor 70 is not greater than the third preset temperature value, the fifth condition being that the temperature difference value is not greater than the fifth preset temperature difference value;
if the air conditioner 1000 satisfies the fourth condition (yes in S3 "in fig. 7) and does not satisfy the fifth condition (no in S5" in fig. 7), controlling the compressor 20 to continue to operate for a fourth preset time period (as shown in S7 "in fig. 7), and after the fourth preset time period, acquiring the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80 and recording a difference therebetween (as shown in S8" in fig. 7), and determining whether the air conditioner 1000 satisfies the fourth condition (as shown in S9 "in fig. 7) and the fifth condition (as shown in S11" in fig. 7);
if the air conditioner 1000 satisfies the fourth condition (yes in S9 "in fig. 7) and does not satisfy the fifth condition (no in S11" in fig. 7), controlling the opening degree of the expansion valve 30 to increase, and determining whether the air conditioner 1000 satisfies the fourth condition (indicated by S15 "in fig. 7) and the fifth condition (indicated by S16" in fig. 7) after operating the air conditioner 1000 for the third period of time (indicated by S13 "in fig. 7) with the opening degree of the expansion valve 30 increased;
if the air conditioner 1000 satisfies the fourth condition (yes in S15 in fig. 7) but does not satisfy the fifth condition (no in S17 in fig. 7), controlling the compressor 20 to stop operating and reporting a refrigerant leakage failure (as shown in S18 in fig. 7);
if the air conditioner 1000 does not satisfy the fourth condition (no in S15 "in fig. 7), controlling the compressor 20 to stop operating and reporting a refrigerant leakage failure (S16" in fig. 7);
if the air conditioner 1000 satisfies the fourth condition (yes in S15 of fig. 7) and the fifth condition (yes in S17 of fig. 7), it is determined that the air conditioner 1000 does not leak the refrigerant and the operation of determining whether the refrigerant of the air conditioner 1000 leaks is exited (S19 of fig. 7).
Specifically, the controller 90 controls the compressor 20 to continuously operate for a third preset time period (as indicated by S1 ″), for example, 25 minutes, but is not limited thereto. For example, the controller 90 controls the compressor 20 to continuously operate for a third preset time period after receiving a cooling or heating on command of the air conditioner 1000 and controlling the compressor 20 to start (as indicated by S0 "in fig. 7). After the compressor 20 is continuously operated for the third preset time period, the controller 90 obtains the temperature value TT of the first temperature sensor 70 5 And temperature value TP of second temperature sensor 80 5 And recording the difference between the two TT 5 -TP 5 (as indicated by S2 "). Then, the controller 90 determines the first temperatureTemperature value TT of sensor 70 5 Whether it is greater than a third predetermined temperature value (e.g., but not limited to 15 deg.C) (as shown in S3 ″) and the temperature difference value TT 5 -TP 5 If it is greater than a fifth preset temperature difference value (e.g., 10 deg.c), but not limited thereto (as shown in S5 "). The controller 90 determines the temperature value TT of the first temperature sensor 70 5 If the temperature value is greater than the third preset temperature value, it indicates that the air conditioner 1000 does not satisfy the fourth condition, the compressor 20 exceeds the upper limit of the normal operation, and in order to avoid the damage of the compressor 20, the controller 90 controls the compressor 20 to stop operating and reports a refrigerant leakage fault (as shown in S4 "). When the controller 90 determines that the air conditioner 1000 satisfies the fourth condition (yes in S3 "in fig. 7) but does not satisfy the fifth condition (no in S5" in fig. 7), that is, the temperature value TT of the first temperature sensor 70 5 Not greater than the third preset temperature value, but temperature value TT of the first temperature sensor 70 5 And temperature value TP of second temperature sensor 80 5 When the difference value between the two temperature sensors is greater than the fifth preset temperature difference value, it indicates that the temperature difference value between the two temperature sensors is too large, and when the refrigerant of the air conditioner 1000 leaks, the compressor 20 of the air conditioner 1000 continuously operates, so that the temperature value TT of the first temperature sensor 70 for measuring the top temperature of the compressor 20 5 May be increased accordingly, but the refrigerant leakage may result in the measured value TP of the second temperature sensor 80 provided at the discharge port of the compressor 20 5 Low, resulting in a significant temperature difference between the measured temperatures of the two temperature sensors. When the air conditioner 1000 determines that the air conditioner 1000 satisfies the fourth condition but does not satisfy the fifth condition, the compressor is controlled to continue to operate for a fourth preset time period (as shown in S7 ″), so as to prevent the air conditioner from not reaching the steady state. Thereafter, the temperature value TT of the first temperature sensor 70 is acquired 6 And temperature value TP of second temperature sensor 80 6 And the difference between the two TT 6 -TP 6 (as indicated by S8 ″), and determines whether the fourth condition and the fifth condition are satisfied by the air conditioner 1000 (as indicated by S9 ″, S11 ″). The controller 90 determines the temperature TT of the first temperature sensor 70 6 Not greater than the third preset temperature value (yes in S9 "in fig. 7), but temperature value TT of the first temperature sensor 70 6 And temperature value TP of second temperature sensor 80 6 When the difference therebetween is greater than the fifth preset temperature difference value (no in S11 "of fig. 7), the opening degree of the expansion valve 30 is controlled to be increased, for example, the opening degree of the expansion valve 30 is controlled to be adjusted to the maximum, and after the opening degree of the expansion valve 30 is increased (for example, the opening degree is adjusted to the maximum), the controller 90 controls the air conditioner 1000 to continue to operate for a third period of time (for example, but not limited thereto) (as shown in S13" of fig. 7), and determines again whether the air conditioner 1000 satisfies the fourth and fifth conditions (as shown in S15 "and S17") when the third period of time expires. This is done to avoid acquisition errors caused by excessive indoor temperature and/or indoor humidity on the temperature of the first temperature sensor 70 and the temperature of the second temperature sensor 80. If the controller 90 determines that the air conditioner 1000 satisfies the fourth condition (yes in S15 of fig. 7) but does not satisfy the fifth condition (no in S17 of fig. 7) this time, it indicates that refrigerant leakage occurs inside the air conditioner 1000, and the controller 90 may control the compressor 20 to stop operating and report a refrigerant leakage failure (S18); or, if the controller 90 determines that the air conditioner 1000 does not satisfy the fourth condition this time (no in S15 "in fig. 7), it indicates that the temperature of the compressor 20 is too high, and the controller 90 controls the compressor 20 to stop operating and reports a refrigerant leakage fault in order to ensure the safety of the compressor 20 (as shown in S16"); alternatively, if the controller 90 determines that the air conditioner 1000 satisfies the fourth condition (yes in S15 of fig. 7) and the fifth condition (yes in S17 of fig. 7) this time, it indicates that the air conditioner 1000 has not leaked the refrigerant, the controller 90 may determine that the air conditioner 1000 has not leaked the refrigerant and quit the operation of determining whether the refrigerant of the air conditioner 1000 has leaked (as shown in S19).
According to some embodiments of the present invention, the operation of determining whether the first and second cutoff valves 101 and 102 are opened and the operation of determining whether the air conditioner 1000 has refrigerant leakage are sequentially performed. In other words, the operation of determining whether the first and second cutoff valves 101 and 102 are opened is performed prior to the operation of determining whether the refrigerant leaks from the air conditioner 1000.
Further, the controller 90 is configured to:
when the discharge control operation performed on the compressor 20 conflicts with the operation of determining whether the first and second cutoff valves 101 and 102 are opened, the operation of determining whether the first and second cutoff valves 101 and 102 are opened is continued, the discharge control operation performed on the compressor 20 is temporarily interrupted, and after the conflict disappears, the operation of controlling the adjustment time of the opening degree of the expansion valve 30 based on the difference between the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80 is resumed; or
When the discharge control operation of the compressor 20 collides with the operation of determining whether the air conditioner 1000 has a refrigerant leakage, the operation of determining whether the air conditioner 1000 has a refrigerant leakage is continued, the discharge control operation of the compressor 20 is temporarily interrupted, and after the collision disappears, the operation of controlling the adjustment time of the opening degree of the expansion valve 30 based on the difference between the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80 is resumed.
For example, the discharge control operation of the compressor 20 by the controller 90 includes controlling the adjustment time of the opening degree of the expansion valve 30, in other words, adjusting the opening degree of the expansion valve 30 at a certain adjustment time; the operation of the controller 90 to determine whether the first and second cut-off valves 101 and 102 are open includes controlling the opening degree of the expansion valve 30 to increase. It can be seen that both of these operations by the controller 90 involve adjusting the opening degree of the expansion valve 30, and may involve different adjustments of the opening degree of the expansion valve 30, where the two operations conflict. In this case, the controller 90 keeps continuing the operation of determining whether the first and second cut-off valves 101 and 102 are open, temporarily interrupts the discharge control operation of the compressor 20, and after the collision disappears, the controller 90 has adjusted the opening degree of the expansion valve 30 according to the operation of determining whether the first and second cut-off valves 101 and 102 are open, the controller 90 regains the temperature of the first temperature sensor 70 and the temperature of the second temperature sensor 80 and regains the operation of controlling the adjustment time of the opening degree of the expansion valve 30 according to the difference between the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80 to adjust the opening degree of the expansion valve 30.
For another example, the discharge control operation of the compressor 20 by the controller 90 includes controlling the adjustment time of the opening degree of the expansion valve 30, in other words, adjusting the opening degree of the expansion valve 30 for a certain adjustment time; the operation of the controller 90 for determining whether the air conditioner 1000 has a refrigerant leakage includes controlling the opening degree of the expansion valve 30 to be increased. It can be seen that both of these operations by the controller 90 involve adjusting the opening degree of the expansion valve 30, and may involve different adjustments of the opening degree of the expansion valve 30, where the two operations conflict. In this case, the controller 90 keeps continuing the operation of determining whether the air conditioner 1000 has a refrigerant leakage, temporarily interrupts the discharge control operation of the compressor 20, and after the collision disappears and the controller 90 has adjusted the opening degree of the expansion valve 30 according to the operation of determining whether the air conditioner 1000 has a refrigerant leakage, the controller 90 regains the temperature of the first temperature sensor 70 and the temperature of the second temperature sensor 80 and regains the operation of controlling the adjustment time of the opening degree of the expansion valve 30 according to the difference between the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80 to adjust the opening degree of the expansion valve 30.
According to some embodiments of the present invention, the temperature probe of the first temperature sensor 70 is a steel piece and the temperature probe of the second temperature sensor 80 is a copper piece. Of course, the invention is not limited thereto.
Other configurations and operations of the air conditioner 1000 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.
The above description of the technology may refer to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration embodiments in which the embodiments are described. These embodiments, while described in sufficient detail to enable those skilled in the art to practice them, are non-limiting; other embodiments may be utilized and changes may be made without departing from the scope of the described embodiments. For example, the order of operations described in a flowchart is non-limiting, and thus the order of two or more operations illustrated in and described in accordance with the flowchart may be altered in accordance with several embodiments. As another example, in several embodiments, one or more operations illustrated in and described with respect to the flowcharts are optional or may be eliminated. Additionally, certain steps or functions may be added to the disclosed embodiments, or two or more steps may be permuted in order. All such variations are considered to be included in the disclosed embodiments and in the claims.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. An air conditioner, comprising:
the refrigerant circulation loop is used for circulating the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator and the four-way valve;
the compressor is used for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser for working;
an outdoor heat exchanger and an indoor heat exchanger, wherein one of the heat exchangers operates as a condenser and the other operates as an evaporator;
the four-way valve is used for controlling the flow direction of the refrigerant in the refrigerant circulation loop so as to switch the outdoor heat exchanger and the indoor heat exchanger between the condenser and the evaporator;
a first temperature sensor for detecting a temperature of a top of the compressor;
a second temperature sensor for detecting a temperature at a discharge port of the compressor;
a controller configured to perform a discharge control operation on the compressor, including: after the expansion valve is controlled to operate at a fixed opening degree for a first preset time period, controlling the adjusting time of the opening degree of the expansion valve according to the difference value of the temperature value of the first temperature sensor and the temperature value of the second temperature sensor, so that the temperature value of the first temperature sensor or the temperature value of the second temperature sensor is equal to or approximately equal to the target exhaust temperature of the compressor.
2. The air conditioner of claim 1, wherein the controller is specifically configured to:
if the absolute value of the difference between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor is equal to or lower than a first preset temperature difference value, adjusting the opening degree of the expansion valve at a first time interval according to the difference between the temperature value of the second temperature sensor and the target exhaust temperature, so that the temperature value of the second temperature sensor is equal to or approximately equal to the target exhaust temperature of the compressor;
if the absolute value is between the first preset temperature difference value and a second preset temperature difference value, adjusting the opening degree of the expansion valve at a second time interval according to the difference between the target exhaust temperature and the average value of the temperature values of the first temperature sensor and the second temperature sensor, so that the temperature value of the first temperature sensor is equal to or approximately equal to the target exhaust temperature of the compressor, wherein the second preset temperature difference value is greater than the first preset temperature difference value;
and if the absolute value is higher than or equal to the second preset temperature difference value, adjusting the opening degree of the expansion valve at a third time interval according to the difference between the temperature value of the first temperature sensor and the target exhaust temperature, so that the temperature value of the first temperature sensor is equal to or approximate to the target exhaust temperature of the compressor.
3. The air conditioner according to claim 2, wherein the second time interval is 1.5 times the first time interval, and the third time interval is 2 times the first time interval.
4. The air conditioner according to claim 1, wherein the control appliance body is configured to:
after the expansion valve is controlled to operate at a fixed opening degree for the first preset time period, judging whether the temperature value of the first temperature sensor is greater than a first preset temperature value or not;
if the judgment result is negative, controlling the adjusting time of the opening degree of the expansion valve according to the absolute value of the difference value of the temperature value of the first temperature sensor and the temperature value of the second temperature sensor;
and if so, controlling the compressor to stop running and reporting the refrigerant leakage fault.
5. The air conditioner according to any one of claims 1 to 4, further comprising:
a first cut-off valve connected between the four-way valve and one end of the indoor heat exchanger;
a second cut-off valve connected between the other end of the indoor heat exchanger and the expansion valve;
the controller is further configured to determine whether the first and second cutoff valves are opened according to a difference value between the temperature value of the first temperature sensor, and the temperature value of the second temperature sensor after controlling the air conditioner to operate for a second preset time period.
6. The air conditioner according to claim 5, wherein the control device body is configured to determine whether the first and second cutoff valves are open by:
judging whether the air conditioner meets a first condition and a second condition, wherein the first condition is that the temperature value of the first temperature sensor is lower than or equal to a second preset temperature value, and the second condition is that the difference value is lower than or equal to a third preset temperature difference value;
if the air conditioner meets the first condition and does not meet the second condition, controlling the opening degree of the expansion valve to increase;
after the air conditioner is operated for a first time period under the condition that the opening degree of the expansion valve is increased, judging whether the air conditioner meets the first condition, the second condition and a third condition, wherein the third condition is that the difference value between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor is lower than or equal to a fourth preset temperature difference value, and the fourth preset temperature difference value is larger than the third preset temperature difference value;
and if the air conditioner does not meet the first condition and/or the third condition, controlling the compressor to stop running and reporting a system fault.
7. The air conditioner of claim 6, wherein the controller is further specifically configured to determine whether the first and second shut-off valves are open by:
if the air conditioner meets the first condition, the second condition and the third condition, determining that the first stop valve and the second stop valve are both opened and quitting the operation of judging whether the first stop valve and the second stop valve are opened;
if the air conditioner meets the first condition and the third condition and does not meet the second condition, controlling the compressor to continuously operate for a second time period, acquiring a temperature value of the first temperature sensor, a temperature value of the second temperature sensor and a difference value between the temperature values after the second time period, and judging whether the air conditioner meets the first condition and the second condition;
if the air conditioner does not meet the first condition or meets the first condition but does not meet the second condition, controlling the compressor to stop running and reporting a system fault;
and if the air conditioner meets the first condition and the second condition, determining that the first stop valve and the second stop valve are both opened and quitting the operation of judging whether the first stop valve and the second stop valve are opened.
8. The air conditioner of claim 5, wherein the controller is further configured to perform an operation of determining whether refrigerant leakage occurs in the air conditioner, comprising:
after controlling the compressor to continuously operate for a third preset time period, obtaining a temperature value of the first temperature sensor and a temperature value of the second temperature sensor, recording a difference value between the temperature values, and judging whether the air conditioner meets a fourth condition and a fifth condition, wherein the fourth condition is that the temperature value of the first temperature sensor is not greater than a third preset temperature value, and the fifth condition is that the temperature difference value is not greater than a fifth preset temperature difference value;
if the air conditioner meets the fourth condition and does not meet the fifth condition, controlling the compressor to continue to operate for a fourth preset time period, acquiring the temperature value of the first temperature sensor and the temperature value of the second temperature sensor after the fourth preset time period, recording the difference value between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor, and judging whether the air conditioner meets the fourth condition and the fifth condition;
if the air conditioner meets the fourth condition and does not meet the fifth condition, controlling the opening degree of the expansion valve to increase, and after the air conditioner runs for a third time period under the condition that the opening degree of the expansion valve is increased, judging whether the air conditioner meets the fourth condition and the fifth condition;
if the air conditioner meets the fourth condition but does not meet the fifth condition, controlling the compressor to stop running and reporting a refrigerant leakage fault;
if the air conditioner does not meet the fourth condition, controlling the compressor to stop running and reporting a refrigerant leakage fault;
and if the air conditioner meets the fourth condition and the fifth condition, judging that the air conditioner does not leak refrigerants and quitting the operation of judging whether the air conditioner leaks the refrigerants.
9. The air conditioner of claim 8, wherein the controller is configured to: sequentially performing the operation of judging whether the first stop valve and the second stop valve are opened and the operation of judging whether the air conditioner leaks the refrigerant; and
when the exhaust control operation performed on the compressor conflicts with the operation of judging whether the first stop valve and the second stop valve are opened, the operation of judging whether the first stop valve and the second stop valve are opened is continued, the exhaust control operation performed on the compressor is temporarily interrupted, and after the conflict disappears, the operation of controlling the adjusting time of the opening degree of the expansion valve according to the difference value of the temperature value of the first temperature sensor and the temperature value of the second temperature sensor is performed again; or
When the exhaust control operation performed on the compressor conflicts with the operation for judging whether the air conditioner leaks the refrigerant, the operation for judging whether the air conditioner leaks the refrigerant is continuously performed, the exhaust control operation on the compressor is temporarily interrupted, and after the conflict disappears, the operation for controlling the adjusting time of the opening degree of the expansion valve according to the difference value of the temperature value of the first temperature sensor and the temperature value of the second temperature sensor is performed again.
10. The air conditioner according to any one of claims 1 to 4, wherein the temperature probe of the first temperature sensor is a steel member, and the temperature probe of the second temperature sensor is a copper member.
CN202211515797.XA 2022-11-30 2022-11-30 Air conditioner Pending CN115789985A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211515797.XA CN115789985A (en) 2022-11-30 2022-11-30 Air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211515797.XA CN115789985A (en) 2022-11-30 2022-11-30 Air conditioner

Publications (1)

Publication Number Publication Date
CN115789985A true CN115789985A (en) 2023-03-14

Family

ID=85443381

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211515797.XA Pending CN115789985A (en) 2022-11-30 2022-11-30 Air conditioner

Country Status (1)

Country Link
CN (1) CN115789985A (en)

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