WO2019062510A1

WO2019062510A1 - Method and device for protection control of air conditioner

Info

Publication number: WO2019062510A1
Application number: PCT/CN2018/104314
Authority: WO
Inventors: 景延芹; 李敬胜; 连建春; 杨文钧; 王彩平
Original assignee: 青岛海尔空调器有限总公司
Priority date: 2017-09-29
Filing date: 2018-09-06
Publication date: 2019-04-04
Also published as: CN107747790B; CN107747790A

Abstract

A method and device for protection control of an air conditioner, which belongs to the technical field of air conditioners. The method comprises the following steps: acquiring the operation voltage of the air conditioner and the ambient temperature (S1); and when the operation voltage and the ambient temperature are outside of a preset range, reducing the revolution speed of an indoor fan (S2 and S3). The described technical solution solves the problem of when a constant frequency air conditioner is in a high temperature-low voltage environment, a compressor is liable to stop working due to the action of the overload protector of the compressor.

Description

Air conditioner protection control method and device

The present application is filed on the basis of the Chinese Patent Application No. PCT Application Serial No.

Technical field

The invention relates to the technical field of air conditioners, and in particular to a method and a device for protecting and controlling air conditioners.

Background technique

With the continuous improvement of people's living standards, the requirements for the use of air conditioners are also increasing. The fixed-frequency air-conditioning refrigeration will cause higher pressure in the air-conditioning system in low-voltage and high-temperature environments. The exhaust gas temperature will be higher and the current will be larger. There is no technology for the fixed-frequency air conditioner in the high-temperature low-voltage environment, there is no measure for the indoor fan speed, it is easy to cause the compressor's overload protector to operate, the compressor is easy to stop, and the overload protector takes at least half an hour to start again after the action, so the indoor The temperature fluctuates greatly and the user experience is poor. It is easy to cause damage to the protector when the compressor starts and stops repeatedly.

Summary of the invention

The invention provides a protection control method and device for an air conditioner, which can reduce the temperature and power of the exhaust gas by periodically reducing the rotation speed of the indoor fan or suspending the indoor fan, thereby avoiding the action of the compressor overload protector, and solving the existing Corresponding problems in technology.

In order to achieve the above object, according to a first aspect of the present invention, a protection control method for a fixed frequency air conditioner in a high temperature and low voltage environment is provided, comprising the following steps:

Obtaining the operating voltage and ambient temperature of the air conditioner;

When the operating voltage and the ambient temperature are outside the set area, the indoor fan speed is decreased.

Preferably, the set area refers to an action closed area of the compressor protector, wherein the operating voltage is between 184V and 253V and the ambient temperature is within 45°C.

Preferably, when the operating voltage and the ambient temperature are outside the set area, detecting the coil initial temperature T1;

When the indoor fan speed decreases by the first set gear operation preset time t1, the current temperature T2 of the coil is detected;

When the temperature difference between the coil initial temperature T1 and the coil current temperature T2 is greater than the set value N, the air conditioner operates according to a user-set operating condition.

Preferably, when the indoor fan speed is 0, after the preset time t1 is run, the air conditioner detects the current temperature T2 of the coil.

Preferably, when the temperature difference between the coil initial temperature T1 and the coil current temperature T2 is less than or equal to the set value N, the indoor fan speed is decreased after the second set gear is operated for a preset time t2. And detecting the current temperature T3 of the coil. When the temperature difference between the current temperature T2 of the coil and the current temperature T3 of the coil is greater than the set value N, the air conditioner operates according to a user-set operating condition.

Preferably, when the operating voltage and the ambient temperature are in a set region, the air conditioner operates according to a user-set operating condition.

According to a second aspect of the embodiments of the present invention, a protection control apparatus for an air conditioner is provided, including:

An obtaining unit, configured to obtain an operating voltage and an ambient temperature of the air conditioner;

And a control unit, configured to control the fan speed of the indoor device to decrease when the operating voltage and the ambient temperature are outside the set region.

Preferably, the device further includes: a first detecting unit, configured to detect a coil initial temperature T1 when the operating voltage and the ambient temperature are outside a set region;

a first control unit, configured to control when the indoor fan speed decreases by a first set gear operation preset time t1;

a second detecting unit, configured to detect a current temperature T2 of the coil;

The second control unit is configured to control the air conditioner to operate according to a user-set operating condition when a temperature difference between the coil initial temperature T1 and the coil current temperature T2 is greater than a set value N.

Preferably, the device further includes: a third control unit, configured to detect the current temperature T2 of the coil after controlling the preset time t1 of the air conditioner operation when the indoor fan speed is 0.

Preferably, the device further includes: a fourth control unit, configured to control the indoor fan when a temperature difference between the coil initial temperature T1 and the coil current temperature T2 is less than or equal to the set value N After the second set gear is operated for the preset time t2, the current temperature T3 of the coil is detected. When the temperature difference between the current temperature T2 of the coil and the current temperature T3 of the coil is greater than the set value N, The air conditioner operates according to the user-set operating conditions.

The method and device for protecting and controlling a fixed-frequency air conditioner in a high-temperature and low-voltage environment provide a purpose of reducing the temperature and power of the exhaust gas by periodically reducing the rotational speed of the fan in the air-conditioning room, thereby avoiding the occurrence of the action of the compressor protector. Ensure that the air conditioner compressor does not stop.

The above general description is to be construed as illustrative and illustrative and not restrictive.

DRAWINGS

The drawings are intended to provide a further understanding of the invention, and are intended to be illustrative of the invention. In the drawing:

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the range of action distribution of a compressor protector in a method of controlling the air conditioner of the present invention.

2 is a schematic flow chart of a method for protecting and controlling an air conditioner according to an embodiment of the present invention.

3 is a flow chart showing a method of protecting and controlling an air conditioner according to a first embodiment of the present invention.

4 is a flow chart showing a method for protecting and controlling an air conditioner according to a second embodiment of the present invention.

Detailed ways

In the following detailed description, numerous specific details are set forth However, it will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods and procedures have not been described in detail so as not to affect the understanding of the invention.

Referring to FIG. 1, the relationship between voltage and temperature and the range of action distribution of the fixed-frequency compressor protector can be obtained. When the voltage is lower than 184V or higher than 253V, the compressor protector is in the non-A zone, that is, Possible action or action zone, the remaining zone is zone A, ie the compressor protector closure zone.

The embodiment of the invention is used for solving the problem that the air conditioner is shut down when the air conditioner is in the non-A area, especially when the ambient temperature is higher than 45 ° C and the operating voltage is lower than 184 V, the compressor is protected by the protection action caused by the overload.

A first aspect of the embodiments of the present invention provides a protection control method for an air conditioner, as shown in FIG. 2, including the following steps:

S1, obtaining the operating voltage and ambient temperature of the air conditioner.

The obtaining of the operating voltage and the ambient temperature is to determine whether the fixed-frequency air conditioner is in a high-temperature and low-voltage environment, and is also a precondition for the control and protection of the present invention. There are many acquisition methods. In this embodiment, the operating voltage and the ambient temperature are preferably obtained by the acquiring unit. The value of the acquisition unit contains the detector for the detection of the operating voltage, and the ambient temperature can be detected by the outdoor ambient temperature sensor.

S2, determining whether the operating voltage and the ambient temperature are outside the set area.

Among them, the setting area is the non-A area. For the set area, it is also divided according to the operating voltage and the ambient temperature. The set area is the compressor protector closed area, and the outside of the set area is the compressor protector action area. The high temperature and low voltage environment in which the fixed frequency air conditioner of the protection control is located. The corresponding judgment unit of the internal setting of the fixed frequency air conditioner will judge the area according to the obtained operating voltage and ambient temperature.

S3, reduce the indoor fan speed.

Among them, reducing the indoor fan speed is to reduce the exhaust temperature and avoid the protection action of the compressor protector.

Specifically, according to the first embodiment of the present invention, as shown in FIG. 3, the above air conditioning protection control method includes the following steps:

S301. Acquire an operating voltage and an ambient temperature of the air conditioner.

S302. Determine whether the operating voltage and the ambient temperature are in the set area. If yes, go to step S307; if no, go to step S303.

S303, detecting a fan speed and a coil initial temperature T1. The fan speed can be detected by the corresponding detection unit, and the initial temperature of the coil can be detected by the indoor coil temperature sensor, which is the coil temperature at the beginning of the operation of the air conditioner.

S304, the indoor fan speed is decreased by the first set gear running preset time t1, the first set gear is preferably a gear, and t1 is preferably 20 minutes. In order to achieve the corresponding effect, the first set gear can also be selected as the second gear or higher, but that will cause the indoor temperature to rise too fast, which is not conducive to the comfort of the room. The selection of 20 minutes can meet the coil temperature drop. The time of the process is required, and the protector does not act during the process because the time is too long. The compressor protector generally has an action time of 30 minutes.

S305. Detect the current temperature T2 of the coil. The current temperature of the coil is also detected by the indoor coil temperature sensor, which is the coil temperature of the indoor fan after running for 20 minutes by lowering the first speed.

S306. Determine whether the temperature difference between the initial temperature air conditioner coil initial temperature T1 and the coil current temperature T2 is greater than a set value N. If yes, go to step S307; if no, go to step S303. Wherein, the fixed frequency air conditioner internally sets a corresponding judging unit to determine whether the temperature difference is greater than the set value N, and N is preferably 3.

S307, the air conditioner operates according to the user-set working condition. Among them, when the temperature difference between T1 and T2 is greater than 3, it means that by reducing the speed of the indoor fan once, the coil temperature drops a lot and reaches the expected value, ensuring that the exhaust temperature also drops at this time, and the compressor protector does not. When an action occurs, the air conditioner can operate according to the user's set condition.

Meanwhile, when the temperature difference between T1 and T2 is less than or equal to 3, step S303 is performed again, indicating that by lowering the indoor fan speed, the coil temperature drop value does not reach the expected value, and it is necessary to continue to reduce the indoor fan speed second profile. After the bit is operated, the second preset time t2 is run until the temperature difference of the coil temperature is detected to be greater than 3, and the air conditioner operates according to the user-set working condition. Wherein, the second set gear position is preferably one gear, and the second preset time t2 is preferably 20 minutes.

Specifically, according to the second embodiment of the present invention, as shown in FIG. 4, the above air conditioning protection control method includes the following steps:

S401. Acquire an operating voltage and an ambient temperature of the air conditioner.

S402. Determine whether the fixed frequency air conditioner is in the set area at the moment. If yes, go to step S409; if no, go to step S403.

S403, detecting the fan speed and the coil initial temperature T1.

S404: Determine whether the fan speed of the fixed frequency air conditioner is zero. If yes, go to step S406; if no, go to step S405. Among them, the air conditioner has a corresponding judgment unit to determine whether the indoor fan speed is zero or not.

S406, the air conditioner runs for 20 minutes. Among them, the air conditioner indoor fan speed is zero, indicating that the fan has been suspended by reducing the speed, and there is no need to reduce the speed.

S405, the indoor fan speed is reduced by one gear, and the air conditioner is operated for 20 minutes.

S407, detecting the current temperature T2 of the coil.

S408, determining whether the temperature difference between the initial temperature air conditioner coil initial temperature T1 and the coil current temperature T2 is greater than 3. If yes, go to step S409; if no, go to step S403.

S409, the air conditioner operates according to the user-set working condition. Among them, when the temperature difference between T1 and T2 is greater than 3, it means that by reducing the speed of the indoor fan once, the coil temperature drops a lot and reaches the expected value, ensuring that the exhaust temperature also drops at this time, and the compressor protector does not. When an action occurs, the air conditioner can operate according to the user's set condition.

Meanwhile, when the temperature difference between T1 and T2 is less than or equal to 3, step S403 is performed again, indicating that by lowering the indoor fan speed, the coil temperature drop value does not reach the expected value, and it is necessary to continue to reduce the indoor fan speed second profile. After the bit is operated, the second preset time t2 is run until the temperature difference of the coil temperature is detected to be greater than 3, and the air conditioner operates according to the user-set working condition.

The specific implementation of the above second embodiment differs from the first embodiment in that, since the indoor fan is likely to have a temperature difference in the process of lowering the rotational speed before it is greater than 3, it is suspended. The indoor fan speed is directly operated for 20 minutes. Since the indoor fan is suspended within 20 minutes, the coil temperature will drop rapidly and the expected temperature difference will be reached.

The method provided by the invention is to reduce the temperature of the exhaust fan and power by periodically reducing the speed of the indoor fan or suspending the indoor fan, thereby avoiding the action of the compressor overload protector and ensuring that the user does not in the high temperature and low voltage environment. The multiple start and stop of the fixed-frequency air-conditioning compressor causes the indoor temperature fluctuation to be too large and the experience is poor, and the damage of the compressor protector due to multiple starts and stops is also avoided.

A second aspect of the embodiments of the present invention provides a protection and control device for an air conditioner, including:

a determining unit, configured to determine whether the operating voltage and the ambient temperature are in a set area;

The control unit is configured to control the fan speed of the indoor device to decrease when the operating voltage and the ambient temperature are outside the set area.

According to a first specific embodiment, the apparatus comprises:

The acquisition unit is configured to obtain an operating voltage and an ambient temperature of the air conditioner. It includes an operating voltage detection module and an ambient temperature detection module, which are used to separately detect the operating voltage and the ambient temperature to obtain values.

The first determining unit is configured to determine whether the operating voltage and the ambient temperature are in the set area, that is, the A area.

The first detecting unit is configured to detect the coil initial temperature T1 when the operating voltage and the ambient temperature are outside the set area.

The first control unit is configured to control the preset time t1 after the indoor fan speed decreases by the first set gear position.

The second detecting unit is configured to detect the current temperature T2 of the coil.

The second determining unit is configured to determine a magnitude relationship between the temperature difference between the coil initial temperature T1 and the coil current temperature T2 and the set value N.

The second control unit is configured to control the air conditioner to operate according to a user-set operating condition when the temperature difference between the coil initial temperature T1 and the coil current temperature T2 is greater than the set value N.

The fourth control unit is configured to: when the temperature difference between the coil initial temperature T1 and the coil current temperature T2 is less than or equal to the set value N, control the indoor fan speed to decrease after the second set gear running preset time t2, and detect the disk The current temperature T3 of the tube, when the temperature difference between the current temperature T2 of the coil and the current temperature T3 of the coil is greater than the set value N, the air conditioner operates according to a user-set operating condition.

According to a second specific embodiment, the apparatus comprises:

The acquisition unit is configured to obtain an operating voltage and an ambient temperature of the air conditioner.

The second determining unit is configured to determine whether the indoor fan speed is zero.

The third control unit is configured to control the preset time t1 of the air conditioner operation when the indoor fan speed is zero.

The third determining unit is configured to determine a magnitude relationship between the temperature difference between the coil initial temperature T1 and the coil current temperature T2 and the set value N.

The fourth control unit is configured to: when the temperature difference between the coil initial temperature T1 and the coil current temperature T2 is less than or equal to the set value N, control the indoor fan speed to decrease after the second set gear running preset time t2, and detect the disk When the current temperature T3 of the tube is greater than the set value N when the current temperature T2 of the coil and the current temperature T3 of the coil are greater than the set value N, the air conditioner operates according to the user-set operating condition.

The protection control device provided by the present invention has a close relationship between each unit included, and the order of action of each unit depends on the order of the steps in the specific implementation of the method.

In addition, the protection control method and device for the fixed frequency air conditioner provided by the present invention are applicable to any of the three conditions of the fixed frequency air conditioner in the high temperature, low voltage, high temperature and low voltage, and are not limited to the high temperature and the low voltage. harsh environment.

The description of the above embodiments is only for helping to understand the method and the core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. The above description should not be construed as limiting the invention.

Claims

A method for controlling and controlling an air conditioner, comprising the steps of:

Obtaining the operating voltage and ambient temperature of the air conditioner;

When the operating voltage and the ambient temperature are outside the set area, the indoor fan speed is decreased.
The method according to claim 1, wherein said set area is an action closed area of a compressor protector, wherein said set voltage is between 184V and 253V and the ambient temperature is Within 45 ° C.
The method of claim 1 further comprising:

When the operating voltage and the ambient temperature are outside the set area, detecting the coil initial temperature T1;

When the indoor fan speed decreases by the first set gear operation preset time t1, the current temperature T2 of the coil is detected;

When the temperature difference between the coil initial temperature T1 and the coil current temperature T2 is greater than the set value N, the air conditioner operates according to a user-set operating condition.
The method of claim 3, further comprising:

When the indoor fan speed is 0, after the preset time t1 is run, the air conditioner detects the current temperature T2 of the coil.
The method of claim 3, further comprising:

When the temperature difference between the coil initial temperature T1 and the coil current temperature T2 is less than or equal to the set value N, the indoor fan speed is decreased by the second set gear after the preset time t2, and the detecting disc is detected. The current temperature T3 of the tube, when the temperature difference between the current temperature T2 of the coil and the current temperature T3 of the coil is greater than the set value N, the air conditioner operates according to a user-set operating condition.
The method of claim 1 wherein said air conditioner operates in a user set operating condition when said operating voltage and said ambient temperature are in a set region.
A protection control device for an air conditioner, characterized in that the device comprises:

An obtaining unit, configured to obtain an operating voltage and an ambient temperature of the air conditioner;

And a control unit, configured to control the fan speed of the indoor device to decrease when the operating voltage and the ambient temperature are outside the set region.
The device of claim 7 further comprising:

a first detecting unit, configured to detect a coil initial temperature T1 when the operating voltage and the ambient temperature are outside a set region;

a first control unit, configured to control when the indoor fan speed decreases by a first set gear operation preset time t1;

a second detecting unit, configured to detect a current temperature T2 of the coil;

The second control unit is configured to control the air conditioner to operate according to a user-set operating condition when a temperature difference between the coil initial temperature T1 and the coil current temperature T2 is greater than a set value N.
The device of claim 8 further comprising:

The third control unit is configured to detect the current temperature T2 of the coil after controlling the preset time t1 of the air conditioner operation when the indoor fan speed is 0.
The device of claim 8 further comprising:

a fourth control unit, configured to control the indoor fan speed to decrease by the second set gear when the temperature difference between the coil initial temperature T1 and the coil current temperature T2 is less than or equal to the set value N After the preset time t2, the current temperature T3 of the coil is detected. When the temperature difference between the current temperature T2 of the coil and the current temperature T3 of the coil is greater than the set value N, the air conditioner operates according to a user setting condition. .