CN110030665A - A kind of defrosting control method, device and air conditioner - Google Patents

Abstract

The invention provides a defrosting control method, a device and an air conditioner, and relates to the technical field of air conditioners. The method includes: in the heating mode, judging whether the air conditioner meets the defrosting control conditions according to the detected outdoor ambient temperature, the defrosting temperature and the running time of the compressor, and when the air conditioner meets the defrosting control conditions, controlling the second valve The valve and the fourth valve are closed, and the first valve and the third valve are opened, so that part of the refrigerant in the exhaust pipe enters the indoor unit heat exchanger through the four-way valve, and the other part of the refrigerant passes through the first valve and the second valve. The inlet pipe enters the outdoor unit heat exchanger. In this way, the part of the outdoor unit heat exchanger that communicates with the first inlet pipe and the first outlet pipe can be heated normally, and the indoor unit of the air conditioner does not need to be shut down, while the outdoor unit heat exchanger is connected to the second inlet pipe and the second outlet pipe. The connected part of the pipe will run refrigerating and defrosting the external unit, realizing the effect of non-stop defrosting of the internal unit, effectively improving the problem of inability to heat the existing defrosting process and improving the user experience.

Description

Defrost control method, device and air conditioner

technical field

The present invention relates to the technical field of air conditioners, and in particular, to a defrosting control method, a device, and an air conditioner.

Background technique

With the development of society, people's living standards continue to improve, the quality of life they pursue is getting higher and higher, and the use of air conditioners is becoming more and more common. At present, the air conditioner will produce condensed water on the surface of the condenser during heating operation. Due to the low temperature outside, the condensed water will condense on the surface of the condenser to produce a frost layer. With the thickening of the frost layer, the heat exchange efficiency of the condenser will be affected. , thus affecting the heating effect.

In order to solve the problem that the accumulation of frost layer affects the heating effect, the temperature of the outer disk is generally detected by the sensor to determine the frosting situation. When the defrosting requirement is met, the four-way valve is reversed, and the cooling mode is transferred to defrost the external unit. At this time, the internal unit is defrosted. Shut down to prevent cold wind from blowing out. In this defrosting mode, the internal unit will stop intermittently, which will affect the user experience.

SUMMARY OF THE INVENTION

The problem solved by the present invention is that the air conditioner needs to be transferred to the refrigeration mode to defrost the external unit, which causes the intermittent shutdown of the internal unit and affects the user experience.

In order to solve the above problems, the present invention provides a defrosting control method, which is applied to an air conditioner. The air conditioner includes an outdoor unit heat exchanger, an indoor unit heat exchanger, a four-way valve and a compressor. The outdoor unit heat exchanger The inlet pipe of the heat exchanger, the indoor unit heat exchanger and the exhaust pipe of the compressor are all connected to the four-way valve, and the inlet pipe of the outdoor unit heat exchanger includes a first inlet pipe and a second inlet pipe , the outlet pipe of the outdoor unit heat exchanger includes a first outlet pipe and a second outlet pipe, the first inlet pipe is communicated with the first outlet pipe, and the second inlet pipe is connected with the second outlet pipe The first outlet pipe is connected to the indoor unit heat exchanger, the second outlet pipe is connected to the air return pipe of the compressor, the exhaust pipe is provided with a first connection point, and the second outlet pipe is connected to the air return pipe of the compressor. A second connection point is arranged on the second inlet pipe, a first connection pipe is arranged between the first connection point and the second connection point, a first valve member is arranged on the first connection pipe, and the first connection pipe is An inlet pipe is provided with a third connection point, one end of the second inlet pipe is connected to the third connection point, a second valve element is arranged on the second inlet pipe, and the second valve element is arranged on the Between the second connection point and the third connection point, the first outlet pipe is provided with a fourth connection point, the second outlet pipe is provided with a fifth connection point, and the second outlet pipe is provided with a fifth connection point. A third valve element is arranged on it and the third valve element is arranged between the fifth connection point and the air return pipe, and a second connection is arranged between the fourth connection point and the fifth connection point The second connecting pipe is provided with a fourth valve member; the method includes:

In the heating mode, determine whether the air conditioner meets the defrost control conditions according to the detected outdoor ambient temperature, the defrost temperature and the running time of the compressor;

When the air conditioner meets the defrosting control condition, the second valve member and the fourth valve member are controlled to be closed, and the first valve member and the third valve member to be opened, so that the exhaust pipe is controlled A part of the refrigerant enters the indoor unit heat exchanger through the four-way valve, and another part of the refrigerant enters the outdoor unit heat exchanger through the first valve member and the second inlet pipe.

In the present invention, the exhaust pipe of the compressor is not only connected to the four-way valve through the first connection point, but also connected to the second inlet pipe of the outdoor heat exchanger through the first connection point and the first connection pipe, while the outdoor The inlet pipe of the machine heat exchanger is divided into two parts: the first inlet pipe and the second inlet pipe, and the outlet pipe of the outdoor machine heat exchanger is also divided into two parts: the first outlet pipe and the second outlet pipe. The outlet pipe is in communication, and the second inlet pipe is in communication with the second outlet pipe, respectively corresponding to part of the heat exchange area on the outdoor unit heat exchanger. When the air conditioner meets the defrost control conditions in the heating mode, by opening the first valve and the third valve, and closing the second valve and the fourth valve, a part of the refrigerant in the exhaust pipe passes through The four-way valve enters the indoor unit heat exchanger, and another part of the refrigerant enters the outdoor unit heat exchanger through the first valve and the second inlet pipe, so that the part of the outdoor unit heat exchanger that communicates with the first inlet pipe and the first outlet pipe The heating operation can be performed normally, and the inner unit of the air conditioner does not need to be shut down, and the part of the outdoor unit heat exchanger connected with the second inlet pipe and the second outlet pipe will run for cooling, and the outer unit will be defrosted, so that the inner unit will be defrosted without stopping. It effectively improves the existing noise caused by frequent starting and stopping of the internal unit during the defrosting process and the problem that heating cannot be performed during the defrosting period, thereby improving the user experience.

Further, the method also includes:

After the first valve element is opened, the opening degree of the first valve element is adjusted according to the defrosting temperature.

In the present invention, when defrosting control is performed, the exhaust pipe of the compressor, the first valve part, the second inlet pipe, the outdoor unit heat exchanger, the second outlet pipe and the return pipe of the compressor will constitute a defrost ring The exhaust pipe of the compressor, the four-way valve, the indoor unit heat exchanger, the first outlet pipe, the outdoor unit heat exchanger, the first inlet pipe, the four-way valve and the return pipe of the compressor will form a heating loop , so the defrost loop only circulates in the air conditioner external unit, which is shorter than the heating loop, so the refrigerant flow in the defrost loop can be controlled by adjusting the opening of the first valve.

Further, the step of adjusting the opening degree of the first valve member according to the defrosting temperature includes:

When the defrosting temperature is less than or equal to a first preset temperature, the opening degree of the first valve element is controlled to increase.

In the present invention, the lower the defrosting temperature, the thicker the frost in the heat exchanger of the outdoor unit, and the greater the required refrigerant flow, so the opening of the first valve needs to be increased.

Further, the step of adjusting the opening degree of the first valve member according to the defrosting temperature includes:

When the defrosting temperature is greater than the first preset temperature and less than or equal to the second preset temperature, the opening degree of the first valve element is controlled to remain unchanged.

Further, the step of adjusting the opening degree of the first valve member according to the defrosting temperature includes:

When the defrosting temperature is greater than the second preset temperature and less than or equal to the third preset temperature, the opening degree of the first valve element is controlled to decrease.

Further, the step of adjusting the opening degree of the first valve member according to the defrosting temperature includes:

When the defrosting temperature is greater than the third preset temperature and the duration is greater than the first preset time, if the collection temperature of the preset collection point of the outdoor unit heat exchanger is greater than the fourth preset temperature, control the The first valve member is closed.

Further, the method also includes:

After the closing time of the first valve element reaches a second preset time, controlling the third valve element to close, and controlling the second valve element and the fourth valve element to open;

When it is detected that the coil temperature of the indoor unit heat exchanger is greater than the fifth preset temperature, the indoor fan of the air conditioner is controlled to operate at the set wind speed, and the defrosting control is exited.

Further, the method also includes:

When the air conditioner meets the defrosting control condition, the internal fan of the air conditioner is controlled to operate at a reduced wind speed.

In the present invention, after the air conditioner enters the defrosting control, by controlling the internal fan of the air conditioner to run at low wind, it can effectively prevent the occurrence of the phenomenon of blowing cold air due to the decrease of the heat exchange function of the heat exchanger of the outdoor unit.

Further, the method also includes:

When the air conditioner meets the defrosting control condition, the outdoor fan of the air conditioner is controlled to stop running or the wind speed of the outdoor fan is reduced to a preset value.

In the present invention, after the air conditioner enters the defrosting control, part of the outdoor unit heat exchanger operates normally for heating, and the other part performs defrosting in the cooling operation, so the outdoor fan can be controlled to reduce the wind speed or stop the operation.

Further, the step of judging whether the air conditioner meets the defrosting control conditions according to the detected outdoor ambient temperature, the defrosting temperature and the running time of the compressor includes:

When the outdoor ambient temperature is less than or equal to the sixth preset temperature and the duration is greater than the third preset time, the continuous operation time of the compressor is greater than the fourth preset time, or the cumulative operation time of the compressor is greater than the fifth preset time When the time is set, the defrosting temperature is less than the seventh preset temperature and the duration is greater than the sixth preset time, it is determined that the air conditioner meets the defrosting control condition.

Further, when the number of times that the air conditioner continuously complies with the defrosting control condition in the heating mode is greater than a preset number of times, the first valve member and the third valve member are controlled to close, and the first valve member and the third valve member are controlled to close. The second valve member and the fourth valve member are opened, and at the same time, the air conditioner is controlled to be operated from the heating mode to the cooling mode.

In the present invention, when the number of times that the air conditioner continuously meets the defrosting control conditions in the heating mode is greater than the preset number of times, the first valve part and the third valve part are controlled to close, and the second valve part and the fourth valve part are opened. , and control the air conditioner to run from heating mode to cooling mode to defrost the external unit, thereby improving the defrosting effect and improving the user experience.

The present invention also provides a defrosting control device, which is applied to an air conditioner. The air conditioner includes an outdoor unit heat exchanger, an indoor unit heat exchanger, a four-way valve and a compressor. The inlet pipe of the outdoor unit heat exchanger , The indoor unit heat exchanger and the exhaust pipe of the compressor are connected with the four-way valve, the inlet pipe of the outdoor unit heat exchanger includes a first inlet pipe and a second inlet pipe, the outdoor unit heat exchanger The outlet pipe of the mechanical heat exchanger includes a first outlet pipe and a second outlet pipe, the first inlet pipe is communicated with the first outlet pipe, the second inlet pipe is communicated with the second outlet pipe, the The first outlet pipe is connected to the indoor unit heat exchanger, the second outlet pipe is connected to the air return pipe of the compressor, the exhaust pipe is provided with a first connection point, and the second inlet pipe is There is a second connection point, a first connection pipe is arranged between the first connection point and the second connection point, a first valve member is arranged on the first connection pipe, and a first valve is arranged on the first inlet pipe. There is a third connection point, one end of the second inlet pipe is connected to the third connection point, the second inlet pipe is provided with a second valve element, and the second valve element is arranged on the second inlet pipe. Between the connection point and the third connection point, the first outlet pipe is provided with a fourth connection point, the second outlet pipe is provided with a fifth connection point, and the second outlet pipe is provided with a third connection point. There are three valve parts and the third valve part is arranged between the fifth connection point and the air return pipe, a second connection pipe is arranged between the fourth connection point and the fifth connection point, and the A fourth valve member is provided on the second connecting pipe; the device includes:

a judgment module, configured to judge whether the air conditioner meets the defrost control conditions according to the detected outdoor ambient temperature, the defrost temperature and the running time of the compressor in the heating mode;

a control module, configured to control the second valve member and the fourth valve member to close, and the first valve member and the third valve member to open when the air conditioner meets the defrosting control condition, so that the A part of the refrigerant in the exhaust pipe enters the indoor unit heat exchanger through the four-way valve, and another part of the refrigerant enters the outdoor unit heat exchanger through the first valve member and the second inlet pipe.

The present invention also provides an air conditioner, comprising an outdoor unit heat exchanger, an indoor unit heat exchanger, a four-way valve, a compressor and a controller, the inlet pipe of the outdoor unit heat exchanger, the indoor unit heat exchanger and the exhaust pipe of the compressor are connected with the four-way valve, the inlet pipe of the outdoor unit heat exchanger includes a first inlet pipe and a second inlet pipe, and the outlet pipe of the outdoor unit heat exchanger includes A first outlet pipe and a second outlet pipe, the first inlet pipe communicates with the first outlet pipe, the second inlet pipe communicates with the second outlet pipe, and the first outlet pipe communicates with the indoor The second outlet pipe is connected to the air return pipe of the compressor, the exhaust pipe is provided with a first connection point, and the second inlet pipe is provided with a second connection point, so A first connection pipe is arranged between the first connection point and the second connection point, a first valve member is arranged on the first connection pipe, and a third connection point is arranged on the first inlet pipe, so One end of the second inlet pipe is connected to the third connection point, the second inlet pipe is provided with a second valve element, and the second valve element is arranged at the second connection point to be connected to the third connection point There is a fourth connection point on the first outlet pipe, a fifth connection point on the second outlet pipe, a third valve element on the second outlet pipe, and the third The valve element is arranged between the fifth connection point and the air return pipe, a second connection pipe is arranged between the fourth connection point and the fifth connection point, and a second connection pipe is arranged on the second connection pipe. Four valve parts, the controller executes the above defrosting control method by running a computer program.

Further, a one-way valve is provided between the air return pipe of the compressor and the four-way valve, and the one-way valve is used to prevent the refrigerant flowing out of the second outlet pipe from flowing back to the four-way valve.

In the present invention, the one-way valve structure is arranged on the air return pipe side of the compressor, which effectively prevents the refrigerant flowing out of the second outlet pipe from flowing back to the four-way valve, which affects the backflow of the heating refrigerant.

Further, the end of the outdoor unit heat exchanger is connected to the second outlet pipe.

In the present invention, in order to ensure the defrosting effect in the outdoor unit heat exchanger, it is necessary to connect the end of the outdoor unit heat exchanger with the second outlet pipe, so that the bottommost flow path in the outdoor unit heat exchanger is in the defrosting ring. Inside the road.

Description of drawings

1 is a schematic diagram of the composition of an air conditioner provided by an embodiment of the present invention;

2 is a schematic flowchart of a defrosting control method provided by an embodiment of the present invention;

3 is another schematic flow chart of a defrosting control method provided by an embodiment of the present invention;

Fig. 4 is another schematic flow chart of the defrosting control method provided by the embodiment of the present invention;

Fig. 5 is the schematic diagram that the opening degree of the first valve member changes with the change of the defrosting temperature;

FIG. 6 is a schematic diagram of functional modules of a defrost control device provided by an embodiment of the present invention.

Description of reference numerals: 10-air conditioner; 100-outdoor unit; 200-interior unit; 300-defrost control device; 101-four-way valve; 102-compressor; 103-exhaust pipe; 104-outdoor unit Heat exchanger; 105-Inlet pipe; 106-Return pipe; 107-Outlet pipe; 108-Capillary pipe; 109-First connecting pipe; 110-Second connecting pipe; 111-Outdoor fan; -outdoor temperature sensor; 114-central temperature sensor; 115-check valve; 201-indoor unit heat exchanger; 202-inner fan; 203-indoor return air temperature sensor; 204-inner disk temperature sensor; 310-judgment module; 320 -Control module; 1051-first inlet pipe; 1052-second inlet pipe; 1071-first outlet pipe; 1072-second outlet pipe; D-first interface; C-second interface; S-third interface; E-fourth port; F1-first valve; F2-second valve; F3-third valve; F4-fourth valve; L1-first connection point; L2-second connection point; L3- Third connection point; L4 - fourth connection point; L5 - fifth connection point.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Please refer to FIG. 1 , which is a schematic diagram of the composition of an air conditioner 10 according to an embodiment of the present invention. The air conditioner 10 includes an external unit 100 and an internal unit 200. In the external unit 100, the first port D of the four-way valve 101 is connected to the exhaust pipe 103 of the compressor 102, and the second port C of the four-way valve 101 It is connected with the inlet pipe 105 of the outdoor unit heat exchanger 104, and the third interface S of the four-way valve 101 is connected with the return pipe 106 of the compressor 102; the inlet pipe 105 of the outdoor unit heat exchanger 104 includes a first inlet pipe 1051 and a second The second inlet pipe 1052, the outlet pipe 107 of the outdoor unit heat exchanger 104 includes a first outlet pipe 1071 and a second outlet pipe 1072, the first inlet pipe 1051 is connected with the first outlet pipe 1071, and the second inlet pipe 1052 is connected with the second outlet pipe 1071. The pipes 1072 are connected, respectively corresponding to half of the heat exchange area of the outdoor unit heat exchanger 104, and the second outlet pipe 1072 is connected with the return air pipe 106; in the indoor unit 200, one end of the indoor unit heat exchanger 201 is connected to the four-way valve 101 The fourth port E of the indoor unit is connected, and the other end of the indoor unit heat exchanger 201 is connected to the first outlet pipe 1071 through the capillary 108 .

The exhaust pipe 103 is provided with a first connection point L1, the second inlet pipe 1052 is provided with a second connection point L2, a first connection pipe 109 is provided between the first connection point L1 and the second connection point L2, A connecting pipe 109 is provided with a first valve member F1, the first inlet pipe 1051 is provided with a third connection point L3, one end of the second inlet pipe 1052 is connected with the third connection point L3, and the second inlet pipe 1052 is provided with a third connection point L3. The second valve element F2 is disposed between the second connection point L2 and the third connection point L3, the first outlet pipe 1071 is provided with a fourth connection point L4, and the second outlet pipe 1072 is provided with a fourth connection point L4. Five connection points L5, the second outlet pipe 1072 is provided with a third valve element F3 and the third valve element F3 is arranged between the fifth connection point L5 and the return pipe 106 of the compressor 102, the fourth connection point L4 and the fifth connection point L4 A second connection pipe 110 is provided between the connection points L5 , and a fourth valve member F4 is provided on the second connection pipe 110 .

The first valve member F1 can be an electronic expansion valve, and the second valve member F2, the third valve member F3 and the fourth valve member F4 can be a solenoid valve or an electronic expansion valve. When the air conditioner 10 operates under normal conditions, the first valve member F1 and the third valve member F3 are kept closed, and the second valve member F2 and the fourth valve member F4 are kept open.

The first connection point L1 , the second connection point L2 , the third connection point L3 , the fourth connection point L4 , and the fifth connection point L5 are all three-way structures, which are used to realize the pipeline is divided into two or two in one.

In the air conditioner 10 shown in FIG. 1 , the defrost temperature sensor 112 , the outdoor temperature sensor 113 , and the middle temperature sensor 114 provided in the outdoor unit 100 are used for the defrost temperature, the outdoor ambient temperature, and the outdoor unit heat exchanger, respectively. 104, the indoor return air temperature sensor 203 and the inner disk temperature sensor 204 installed in the indoor unit 200 are used to detect the indoor return air temperature and the coil temperature of the indoor unit heat exchanger 201, respectively.

A one-way valve 115 is provided between the air return pipe 106 of the compressor 102 and the four-way valve 101. The one-way valve 115 is used to prevent the refrigerant flowing out of the second outlet pipe 1072 from flowing backward to the air conditioner 10 during the defrosting operation of the air conditioner 10. The four-way valve 101 affects the return of the heating and cooling medium.

Optionally, since the water in the outdoor unit heat exchanger 104 flows downward after defrosting, the temperature of the flow path at the bottom of the outdoor unit heat exchanger 104 is relatively low. If the flow path at the bottom is not in the defrosting loop In this embodiment, the end of the outdoor unit heat exchanger 104 can be connected to the second outlet pipe 1072, so that the outdoor unit The bottommost flow path in the heat exchanger 104 is in the defrosting loop, thereby improving the defrosting effect of the outdoor unit heat exchanger 104 .

In this embodiment, the air conditioner 10 may further include a controller (not shown in FIG. 1 ), the controller may be located in the external unit 100 or the internal unit 200, and the controller stores the embodiments of the present invention For the program instructions/modules corresponding to the defrosting control method and device provided, the controller executes various functional applications and data processing by executing these computer programs and modules.

Please refer to FIG. 2 , which is a schematic flowchart of a defrosting control method provided by an embodiment of the present invention. It should be noted that the defrosting control method of the present invention is not limited to the specific sequence shown in FIG. 2 and the following. It should be understood that, in other embodiments, the order of some steps in the defrosting control method of the present invention may be exchanged with each other according to actual needs, or some steps may be omitted or deleted. The defrosting control method can be applied to the above-mentioned controller, and the specific flow shown in FIG. 2 will be described in detail below.

Step S101 , in the heating mode, it is judged whether the air conditioner meets the defrost control conditions according to the detected outdoor ambient temperature, the defrost temperature and the running time of the compressor.

Specifically, when the outdoor ambient temperature is less than or equal to the sixth preset temperature and the duration is greater than the third preset time, the continuous operation time of the compressor 102 is greater than the fourth preset time, or the cumulative operation time of the compressor 102 is greater than the fifth preset time When the time and the defrosting temperature are less than the seventh preset temperature and the duration is greater than the sixth preset time, it is determined that the air conditioner 10 meets the defrosting control conditions.

The outdoor ambient temperature Tao can be detected by the above-mentioned outdoor temperature sensor 113 , and the defrost temperature Tdef can be detected by the above-mentioned defrost temperature sensor 112 .

Step S102, when the air conditioner meets the defrosting control conditions, control the second valve and the fourth valve to close, and the first valve and the third valve to open, so that a part of the refrigerant in the exhaust pipe enters through the four-way valve. The indoor unit heat exchanger, and another part of the refrigerant enters the outdoor unit heat exchanger through the first valve and the second inlet pipe.

In this embodiment, the first valve element F1 may be opened by a preset initial step number, for example, the initial step number may be 160 PLS. When the air conditioner 10 meets the defrost control conditions, it enters the defrost control. By opening the first valve F1 and the third valve F3, and closing the second valve F2 and the fourth valve F4, the exhaust pipe is Part of the refrigerant in 103 enters the indoor unit heat exchanger 201 through the four-way valve 101, and another part of the refrigerant enters the outdoor unit heat exchanger 104 through the first valve F1 and the second inlet pipe 1052, so that the outdoor unit heat exchanger 104 The part communicating with the first inlet pipe 1051 and the first outlet pipe 1071 can be heated normally, and the indoor unit 200 does not need to be shut down. Part of it will run refrigerating to defrost the external unit, thus realizing the effect of non-stop defrosting of the internal unit, effectively improving the noise caused by the frequent starting and stopping of the internal unit during the existing defrosting process and the inability to heat during the defrosting period. problem and improve the user experience.

Optionally, in order to prevent the occurrence of the phenomenon of blowing cold air due to the decrease of the heat exchange function of the outdoor unit heat exchanger 104 after the air conditioner 10 enters the defrost control condition, when the air conditioner 10 meets the defrost control conditions, the air conditioner can be controlled first. The internal fan 202 of the appliance 10 operates at a reduced wind speed.

Optionally, after the air conditioner 10 enters the defrost control, a part of the outdoor unit heat exchanger 104 operates normally for heating, and the other part performs defrosting during the cooling operation, so the second valve part F2 and the fourth valve part F4 can be controlled. When the first valve element F1 and the third valve element F3 are opened, the outdoor fan 111 of the air conditioner 10 is controlled to stop running or to reduce the wind speed of the outdoor fan 111 to a preset value. The preset value may be understood as the preset minimum rotational speed of the outdoor fan 111 .

During the defrosting operation, the exhaust pipe 103 of the compressor 102, the first valve element F1, the second inlet pipe 1052, the outdoor unit heat exchanger 104, the second outlet pipe 1072 and the air return pipe 106 of the compressor 102 will be constituted Frost loop, the exhaust pipe 103 of the compressor 102, the four-way valve 101, the indoor unit heat exchanger 201, the first outlet pipe 1071, the outdoor unit heat exchanger 104, the first inlet pipe 1051, the four-way valve 101 and the compressor The air return pipe 106 of the air conditioner 102 will form a heating loop. Since the defrosting loop only circulates in the air conditioner's outdoor unit, which is shorter than the heating loop, the first valve is adjusted according to the frost condition in the outdoor unit heat exchanger 104 The opening of F1 can control the refrigerant flow in the defrosting loop and improve the defrosting efficiency. Based on this, FIG. 3 shows another schematic flowchart of the defrosting control method provided by the embodiment of the present invention, and the method may further include:

In step S103, after the first valve element is opened, the opening degree of the first valve element is adjusted according to the defrosting temperature.

Specifically, when the defrosting temperature is less than or equal to the first preset temperature, the opening of the first valve F1 is controlled to increase, and when the defrosting temperature is greater than the first preset temperature and less than or equal to the second preset temperature, the first valve F1 is controlled to increase. The opening degree of a valve element F1 remains unchanged. When the defrosting temperature is greater than the second preset temperature and less than or equal to the third preset temperature, the opening degree of the first valve element F1 is controlled to decrease. When the defrosting temperature is greater than the third preset temperature When the preset temperature and the duration is greater than the first preset time, if the collecting temperature of the preset collecting point of the outdoor unit heat exchanger 104 is greater than the fourth preset temperature, the first valve element F1 is controlled to close.

The collection temperature TC of the preset collection point of the outdoor unit heat exchanger 104 can be detected by the above-mentioned central temperature sensor 114, that is, the collection temperature TC of the preset collection point of the outdoor unit heat exchanger 104 is the heat exchange of the outdoor unit temperature at the center of the device 104 .

It can be understood that the lower the defrosting temperature Tdef, the thicker the frost in the outdoor unit heat exchanger 104 and the greater the refrigerant flow required in the defrosting loop, so the opening of the first valve F1 needs to be increased.

It should be noted that the adjustment range of the number of steps of the electronic expansion valve is 0PLS~500PLS, and the effective adjustment range is generally 80PLS~480PLS. Therefore, in the present application, the adjustment range of the number of steps for setting the first valve element F1 is between 100PLS and 450PLS. That is to say, when increasing the opening degree of the first valve element F1, the maximum number of steps is generally not more than 450 PLS, and when reducing the opening degree of the first valve element F1, the minimum number of steps is not less than 100 PLS.

Please refer to FIG. 4 , which is another schematic flowchart of the defrosting control method provided by the embodiment of the present invention. The defrosting control method may further comprise the following steps:

Step S104, after the closing time of the first valve element reaches the second preset time, control the third valve element to close, and control the second valve element and the fourth valve element to open.

Step S105, when it is detected that the coil temperature of the indoor unit heat exchanger is greater than the fifth preset temperature, control the indoor fan of the air conditioner to run at the set wind speed, and exit the defrost control.

The coil temperature of the indoor unit heat exchanger 201 can be detected by the inner disk temperature sensor 204, and the set wind speed can be understood as the rotational speed of the indoor fan 202 when the air conditioner 10 is operating normally.

Step S106, when the number of times that the air conditioner continuously meets the defrosting control conditions in the heating mode is greater than the preset number of times, control the first valve element and the third valve element to close, the second valve element and the fourth valve element to open, and control the The air conditioner operates from heating mode to cooling mode.

In this embodiment, since only part of the outdoor unit heat exchanger 104 is used for defrosting, the defrosting may not be clean when the temperature is too low and the humidity is too high, thereby affecting user experience. In view of this, when the air conditioner 10 defrosts a certain number of times according to the above-mentioned steps S101 to S105, the air conditioner 10 can be controlled to perform a normal logic defrost, and the first valve F1 and the third valve F3 are closed at this time. , the second valve F2 and the fourth valve F4 are opened, the air conditioner 10 is switched from the heating mode to the cooling mode, and the indoor unit is stopped to prevent the cold air from blowing out.

Hereinafter, an example is given to describe the above steps S101 to S106 in detail. Assuming that the preset number of times is 3, the first preset temperature is -2°C, the second preset temperature is 7°C, the third preset temperature is 12°C, the fourth preset temperature is 7°C, and the fifth preset temperature is is 45°C, the sixth preset temperature is 0°C, the seventh preset temperature is -2°C, the first preset time is 2min, the second preset time is 5S, the third preset time is 5min, and the fourth preset time is The time is set to 5min, the fifth preset time is 40min, and the sixth preset time is 5min. When the air conditioner 10 is operating in the heating mode, if the detected outdoor ambient temperature Tao, the defrost temperature Tdef and the running time of the compressor 102 satisfy the following three conditions simultaneously: 1. the outdoor ambient temperature Tao≤0°C and the duration > 5min; ②The continuous running time of the compressor 102>5min or the cumulative running time of the compressor 102>40min; ③The defrost temperature Tdef<-2°C and the duration>5min, then it is determined that the air conditioner 10 meets the defrost control conditions and needs Enter the defrost control process.

After entering the defrosting operation, firstly control the internal fan 202 of the air conditioner 10 to run at a low wind speed to prevent the phenomenon of blowing cold air due to the drop of the external heat exchange, and then control the first valve part F1 and the third valve part F3 to open, and the first valve part F1 and the third valve part F3 are opened. The second valve member F2 and the fourth valve member F4 are closed, and the initial opening steps of the first valve member F1 are 160 PLS. At this time, a part of the outdoor unit heat exchanger 104 is in cooling operation (defrosting), and the other part is in normal heating operation , and control the rotation speed of the outdoor fan 111 to a minimum or stop running. When the first valve element F1 is opened, the defrosting temperature Tdef will gradually increase due to defrosting. At this time, the relationship between the opening degree of the first valve element F1 and the defrosting temperature Tdef can be referred to Figure 5. When Tdef≤-2 At ℃, the opening degree of the first valve part F1 needs to be gradually increased, and the maximum is not higher than 450PLS; when -2<Tdef≤7℃, the opening degree of the first valve part F1 is consistent with the previous state; when 7< When Tdef≤12℃, the opening degree of the first valve F1 gradually decreases, and the minimum opening degree is 100PLS; when Tdef＞12℃ and the duration is greater than 2min, check the temperature TC in the middle of the outdoor unit heat exchanger 104, if TC >7°C, close the first valve F1; otherwise, continue to operate and repeat the previous steps until TC>7°C. When the first valve F1 is closed for 5S, the third valve F3 is closed, the second valve F2 and the fourth valve F4 are opened at the same time, and the coil temperature TE of the indoor unit heat exchanger 201 is detected. When TE>45 When the temperature is ℃, the indoor fan 202 is controlled to run at the set wind speed, and the defrost control is exited.

After the air conditioner 10 continuously performs the above defrost control process three times in the heating mode, when the defrost control conditions are met for the fourth time, the first valve member F1 and the third valve member F3 are controlled to close, and the second valve member F3 is controlled to close. The valve F2 and the fourth valve F4 are opened, and at the same time, the air conditioner 10 is controlled to switch from the heating mode to the cooling mode, and the external unit is defrosted. Defrost effect, improve user experience.

Please refer to FIG. 6 , which is a schematic diagram of functional modules of the defrosting control device 300 according to an embodiment of the present invention. It should be noted that, the basic principles and technical effects of the defrosting control device 300 provided in this embodiment are the same as those in the foregoing method embodiments. For the sake of brief description, the parts not mentioned in this embodiment can be implemented with reference to the foregoing methods. corresponding content in the example. The defrosting control device 300 can be applied to the above-mentioned controller, and includes a judgment module 310 and a control module 320 .

The judgment module 310 is used to judge whether the air conditioner 10 meets the defrost control conditions according to the detected outdoor ambient temperature, the defrost temperature and the running time of the compressor 102 in the heating mode.

Optionally, the judging module 310 is specifically configured to be used when the outdoor ambient temperature is less than or equal to the sixth preset temperature and the duration is greater than the third preset time, the continuous running time of the compressor 102 is greater than the fourth preset time, or the compressor 102 When the accumulated running time is greater than the fifth preset time, the defrost temperature is less than the seventh preset temperature, and the duration is greater than the sixth preset time, it is determined that the air conditioner 10 meets the defrost control conditions.

It can be understood that the judging module 310 can execute the above step S101.

The control module 320 is configured to control the second valve element F2 and the fourth valve element F4 to close, and the first valve element F1 and the third valve element F3 to open when the air conditioner 10 meets the defrosting control condition, so that the exhaust pipe 103 A part of the refrigerant enters the indoor unit heat exchanger 201 through the four-way valve 101 , and another part of the refrigerant enters the outdoor unit heat exchanger 104 through the first valve F1 and the second inlet pipe 1052 .

Optionally, the control module 320 is further configured to adjust the opening degree of the first valve element F1 according to the defrosting temperature after the first valve element F1 is opened.

Wherein, the control module 320 is specifically configured to control the opening of the first valve F1 to increase when the defrosting temperature is less than or equal to the first preset temperature; when the defrosting temperature is greater than the first preset temperature and less than or equal to the second preset temperature When setting the temperature, the opening degree of the first valve element F1 is controlled to remain unchanged; when the defrosting temperature is greater than the second preset temperature and less than or equal to the third preset temperature, the opening degree of the first valve element F1 is controlled to decrease; When the defrosting temperature is greater than the third preset temperature and the duration is greater than the first preset time, if the collection temperature of the preset collection point of the outdoor unit heat exchanger 104 is greater than the fourth preset temperature, the first valve F1 is controlled to close .

Optionally, the control module 320 may be further configured to control the third valve element F3 to close, and control the second valve element F2 and the fourth valve element F4 after the closing time of the first valve element F1 reaches the second preset time. Turn on; when it is detected that the coil temperature of the indoor unit heat exchanger 201 is greater than the fifth preset temperature, the indoor fan 202 of the air conditioner 10 is controlled to run at the set wind speed, and the defrost control is exited.

Optionally, the control module 320 may also be used to control the indoor fan 202 of the air conditioner 10 to operate at a reduced wind speed when the air conditioner 10 meets the defrosting control conditions.

Optionally, the control module 320 can also be used to control the outdoor fan 111 of the air conditioner 10 to stop running or reduce the wind speed of the outdoor fan 111 to a preset value when the air conditioner 10 meets the defrost control conditions.

Optionally, the control module 320 can also be used to control the first valve member F1 and the third valve member F3 to close, and the first valve member F3 to be closed when the number of times the air conditioner 10 continuously meets the defrost control conditions in the heating mode is greater than a preset number of times. The second valve member F2 and the fourth valve member F4 are opened, and at the same time, the air conditioner 10 is controlled to be operated from the heating mode to the cooling mode.

It can be understood that the control module 320 can execute the above steps S102, S103, S104, S105 and S106.

To sum up, in the defrosting control method, device and air conditioner provided by the embodiments of the present invention, since the exhaust pipe of the compressor is not only connected to the four-way valve through the first connection point, but also connected to the four-way valve through the first connection point and the first connection point. A connecting pipe is connected to the second inlet pipe of the outdoor unit heat exchanger, and the inlet pipe of the outdoor unit heat exchanger is divided into two parts: the first inlet pipe and the second inlet pipe, and the outlet pipe of the outdoor unit heat exchanger is also divided into the first inlet pipe and the second inlet pipe. An outlet pipe and a second outlet pipe are two parts, the first inlet pipe is communicated with the first outlet pipe, and the second inlet pipe is communicated with the second outlet pipe, respectively corresponding to part of the heat exchange area on the outdoor unit heat exchanger. When the air conditioner meets the defrost control conditions in the heating mode, by opening the first valve and the third valve, and closing the second valve and the fourth valve, a part of the refrigerant in the exhaust pipe passes through The four-way valve enters the indoor unit heat exchanger, and another part of the refrigerant enters the outdoor unit heat exchanger through the first valve and the second inlet pipe, so that the part of the outdoor unit heat exchanger that communicates with the first inlet pipe and the first outlet pipe The heating operation can be performed normally, and the inner unit of the air conditioner does not need to be shut down, and the part of the outdoor unit heat exchanger connected with the second inlet pipe and the second outlet pipe will run for cooling, and the outer unit will be defrosted, so that the inner unit will be defrosted without stopping. It effectively improves the existing noise caused by frequent starting and stopping of the internal unit during the defrosting process and the problem that heating cannot be performed during the defrosting period, thereby improving the user experience.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Claims (15)

1. a kind of defrosting control method is applied to air conditioner (10), which is characterized in that the air conditioner (10) includes that outdoor unit changes Hot device (104), indoor set heat exchanger (201), four-way valve (101) and compressor (102), the outdoor unit heat exchanger (104) The exhaust pipe (103) of inlet pipe (105), the indoor set heat exchanger (201) and the compressor (102) with the four-way valve (101) it connecting, the inlet pipe (105) of the outdoor unit heat exchanger (104) includes the first inlet pipe (1051) and the second inlet pipe (1052), The outlet pipe (107) of the outdoor unit heat exchanger (104) include the first outlet pipe (1071) and the second outlet pipe (1072), described first into Pipe (1051) is connected to first outlet pipe (1071), and second inlet pipe (1052) is connected to second outlet pipe (1072), First outlet pipe (1071) connect with the indoor set heat exchanger (201), second outlet pipe (1072) and the compressor (102) muffler (106) connection, the exhaust pipe (103) are equipped with the first tie point (L1), second inlet pipe (1052) It is equipped with the second tie point (L2), the first connecting tube is equipped between first tie point (L1) and second tie point (L2) (109), first connecting tube (109) is equipped with the first valve member (F1), and first inlet pipe (1051) connects equipped with third Point (L3), one end of second inlet pipe (1052) are connect with the third tie point (L3), on second inlet pipe (1052) Equipped with the second valve member (F2) and second valve member (F2) is set to second tie point (L2) and the third tie point (L3) between, first outlet pipe (1071) is equipped with the 4th tie point (L4), and second outlet pipe (1072) is equipped with the 5th Tie point (L5), second outlet pipe (1072) are equipped with third valve member (F3) and the third valve member (F3) and are set to described the Between five tie points (L5) and the muffler (106), between the 4th tie point (L4) and the 5th tie point (L5) Equipped with the second connecting tube (110), second connecting tube (110) is equipped with the 4th valve member (F4)；The described method includes:

In a heating mode, according to the runing time of the outdoor environment temperature of detection, defrost temperature and the compressor (102) Judge whether the air conditioner (10) meets defrosting control condition；

When the air conditioner (10) meets defrosting control condition, second valve member (F2) and the 4th valve member (F4) are controlled It closes, first valve member (F1) and the third valve member (F3) are opened, so that a part of refrigerant in the exhaust pipe (103) Enter the indoor set heat exchanger (201) by the four-way valve (101), another part refrigerant passes through first valve member (F1) And second inlet pipe (1052) enters the outdoor unit heat exchanger (104).

2. the method according to claim 1, wherein the method also includes:

After first valve member (F1) is opened, the aperture of first valve member (F1) is adjusted according to the defrost temperature.

3. according to the method described in claim 2, it is characterized in that, described adjust first valve member according to the defrost temperature (F1) the step of aperture includes:

When the defrost temperature is less than or equal to the first preset temperature, the aperture for controlling first valve member (F1) increases.

4. according to the method described in claim 2, it is characterized in that, described adjust first valve member according to the defrost temperature (F1) the step of aperture includes:

When the defrost temperature is greater than the first preset temperature and is less than or equal to the second preset temperature, first valve member is controlled (F1) aperture remains unchanged.

5. according to the method described in claim 2, it is characterized in that, described adjust first valve member according to the defrost temperature (F1) the step of aperture includes:

When the defrost temperature is greater than the second preset temperature and is less than or equal to third preset temperature, first valve member is controlled (F1) aperture reduces.

6. according to the method described in claim 2, it is characterized in that, described adjust first valve member according to the defrost temperature (F1) the step of aperture includes:

When the defrost temperature is greater than third preset temperature and the duration is greater than the first preset time, if the outdoor unit changes The temperature collection of the default collection point of hot device (104) is greater than the 4th preset temperature, then controls first valve member (F1) and close.

7. according to the method described in claim 6, it is characterized in that, the method also includes:

After the shut-in time of first valve member (F1) reaches the second preset time, controls the third valve member (F3) and closes, And control second valve member (F2) and the 4th valve member (F4) opening；

When the coil temperature for detecting indoor set heat exchanger (201) is greater than five preset temperatures, the air conditioner (10) are controlled Inner blower (202) operated with wind speed setting, and exit defrosting control.

8. the method according to claim 1, wherein the method also includes: meet in the air conditioner (10) When defrosting control condition, the inner blower (202) for controlling the air conditioner (10) reduces wind speed operating.

9. the method according to claim 1, wherein the method also includes:

When the air conditioner (10) meets defrosting control condition, the outer blower (111) for controlling the air conditioner (10) stops fortune Turn or the wind speed of the outer blower (111) is reduced to preset value.

10. the method according to claim 1, wherein the outdoor environment temperature according to detection, defrost temperature And the runing time of the compressor (102) judges the step of whether air conditioner (10) meets defrosting control condition packet It includes:

When the outdoor environment temperature is less than or equal to the 6th preset temperature and the duration is greater than third preset time, the compression The continuous operating time of machine (102) is greater than the 4th preset time or the accumulated running time of the compressor (102) is greater than the 5th Preset time, the defrost temperature determine the sky less than the 7th preset temperature and when the duration is greater than six preset times Device (10) are adjusted to meet defrosting control condition.

11. -10 described in any item methods according to claim 1, which is characterized in that the method also includes: when the air-conditioning When the number that device (10) continuously meets the defrosting control condition under the heating mode is greater than preset times, described the is controlled One valve member (F1) and the third valve member (F3) are closed, and second valve member (F2) and the 4th valve member (F4) are opened, simultaneously It controls the air conditioner (10) and refrigeration mode operation is switched to by the heating mode.

12. a kind of defrosting control device is applied to air conditioner (10), which is characterized in that the air conditioner (10) includes outdoor unit Heat exchanger (104), indoor set heat exchanger (201), four-way valve (101) and compressor (102), the outdoor unit heat exchanger (104) Inlet pipe (105), the indoor set heat exchanger (201) and the compressor (102) exhaust pipe (103) with the four-way valve (101) it connecting, the inlet pipe (105) of the outdoor unit heat exchanger (104) includes the first inlet pipe (1051) and the second inlet pipe (1052), The outlet pipe (107) of the outdoor unit heat exchanger (104) include the first outlet pipe (1071) and the second outlet pipe (1072), described first into Pipe (1051) is connected to first outlet pipe (1071), and second inlet pipe (1052) is connected to second outlet pipe (1072), First outlet pipe (1071) connect with the indoor set heat exchanger (201), second outlet pipe (1072) and the compressor (102) muffler (106) connection, the exhaust pipe (103) are equipped with the first tie point (L1), second inlet pipe (1052) It is equipped with the second tie point (L2), the first connecting tube is equipped between first tie point (L1) and second tie point (L2) (109), first connecting tube (109) is equipped with the first valve member (F1), and first inlet pipe (1051) connects equipped with third Point (L3), one end of second inlet pipe (1052) are connect with the third tie point (L3), on second inlet pipe (1052) Equipped with the second valve member (F2) and second valve member (F2) is set to second tie point (L2) and the third tie point (L3) between, first outlet pipe (1071) is equipped with the 4th tie point (L4), and second outlet pipe (1072) is equipped with the 5th Tie point (L5), second outlet pipe (1072) are equipped with third valve member (F3) and the third valve member (F3) and are set to described the Between five tie points (L5) and the muffler (106), between the 4th tie point (L4) and the 5th tie point (L5) Equipped with the second connecting tube (110), second connecting tube (110) is equipped with the 4th valve member (F4)；Described device includes:

Judgment module (310) is used in a heating mode, according to the outdoor environment temperature of detection, defrost temperature and the pressure The runing time of contracting machine (102) judges whether the air conditioner (10) meets defrosting control condition；

Control module (320), for controlling second valve member (F2) when the air conditioner (10) meets defrosting control condition It is closed with the 4th valve member (F4), first valve member (F1) and the third valve member (F3) are opened, so that the exhaust pipe (103) a part of refrigerant in enters the indoor set heat exchanger (201) by the four-way valve (101), another part refrigerant Enter the outdoor unit heat exchanger (104) by first valve member (F1) and second inlet pipe (1052).

13. a kind of air conditioner, which is characterized in that including outdoor unit heat exchanger (104), indoor set heat exchanger (201), four-way valve (101), compressor (102) and controller, inlet pipe (105), the indoor set heat exchanger of the outdoor unit heat exchanger (104) (201) and the exhaust pipe (103) of the compressor (102) is connect with the four-way valve (101), the outdoor unit heat exchanger (104) inlet pipe (105) includes the first inlet pipe (1051) and the second inlet pipe (1052), and the outdoor unit heat exchanger (104) goes out It manages (107) and includes the first outlet pipe (1071) and the second outlet pipe (1072), first inlet pipe (1051) and first outlet pipe (1071) it is connected to, second inlet pipe (1052) is connected to second outlet pipe (1072), first outlet pipe (1071) and institute Indoor set heat exchanger (201) connection is stated, second outlet pipe (1072) connect with the muffler (106) of the compressor (102), The exhaust pipe (103) is equipped with the first tie point (L1), and second inlet pipe (1052) is equipped with the second tie point (L2), institute It states and is equipped with the first connecting tube (109) between the first tie point (L1) and second tie point (L2), first connecting tube (109) it is equipped with the first valve member (F1), first inlet pipe (1051) is equipped with third tie point (L3), second inlet pipe (1052) one end is connect with the third tie point (L3), and second inlet pipe (1052) is equipped with the second valve member (F2) and institute It states the second valve member (F2) to be set between second tie point (L2) and the third tie point (L3), first outlet pipe (1071) it is equipped with the 4th tie point (L4), second outlet pipe (1072) is equipped with the 5th tie point (L5), and described second goes out Pipe (1072) is equipped with third valve member (F3) and the third valve member (F3) is set to the 5th tie point (L5) and described time Between tracheae (106), the second connecting tube (110) are equipped between the 4th tie point (L4) and the 5th tie point (L5), Second connecting tube (110) is equipped with the 4th valve member (F4), and the controller is executed by operation computer program such as power Benefit requires the described in any item methods of 1-10.

14. air conditioner according to claim 13, which is characterized in that the muffler (106) of the compressor (102) and institute It states and is equipped with check valve (115) between four-way valve (101), the check valve (115) is for preventing second outlet pipe (1072) from flowing Refrigerant out is countercurrently to the four-way valve (101).

15. air conditioner according to claim 13, which is characterized in that the end of the outdoor unit heat exchanger (104) and institute State the second outlet pipe (1072) connection.