TW201716730A - Heat pump air condition system and control method thereof - Google Patents

Abstract

A heat pump air condition system includes a first, a second, and a third shut-off valve, a refrigerant cycling module, and a liquid supplying module. The refrigerant cycling module includes a first, a second, and a third heat exchanger, a four-way valve, a compressor, and an expansion device. The four-way valve includes a first, a second, a third, and a fourth connecting port connecting to each other. The first connecting port, the compressor, the first heat exchanger, and the second connecting port are connected in sequence. The third connecting port, the second heat exchanger, the expansion device, the third heat exchanger, and the forth connecting port are connected in sequence. The first shut-off valve is disposed between the expansion device and the third heat exchanger. The second shut-off is disposed between the third heat exchanger and the fourth connecting port. One end of the third shut-off valve is connecting between the expansion device and the first shut-off valve, and another end is connecting between the second shut-off and the fourth connecting port. The liquid supplying module is connected to the first heat exchanger.

Description

Heat pump air conditioning system and control method thereof

This proposal relates to a heat pump air conditioning system and a control method thereof, particularly a heat pump air conditioning system and a control method thereof that achieve different heat exchange modes by changing the flow direction of the refrigerant.

In the past 100 years, hot water, air-conditioning and heating have become an indispensable part of people's daily lives. In most cases, hot water is provided by the heat pump unit, and air conditioning and heating are provided by the air conditioner. Wherein, the heat pump device is composed of a heating device and a water supply device, and the water supply device supplies water to the heating device, and the heating device lifts the water to a specific temperature for use by a person. As for the air conditioner, at least a compressor, an expansion valve, an evaporator, a condenser, and a fan are provided. The refrigerant exchanges heat with the evaporator and the condenser, respectively, and supplies the cold air or the heating to the user by blowing the fan.

As described above, the existing air conditioner and the heat pump device are two independent devices, and each has its own limitations in terms of use or price. In response, manufacturers have developed a hybrid heat pump air conditioning system that combines an air conditioner and a heat pump. In detail, the composite heat pump air conditioning system will have three reversing valve, electronic expansion valve and the like to switch the operation state between the heat pump, the cold air and the heating by changing the flow direction of the refrigerant.

However, during the mode switching process of the composite heat pump air conditioner, excessive refrigerant may be trapped in the partially closed pipeline, which causes a problem of insufficient refrigerant in the pipeline being operated, thereby reducing the performance coefficient of the system.

In view of the above problems, the present proposal provides a heat pump air conditioning system and a control method thereof to avoid the problem of insufficient refrigerant in the pipeline to improve the performance coefficient of the system.

The heat pump air conditioning system of one embodiment of the present invention comprises a refrigerant circulation module, a first shut-off valve, a second shut-off valve, a third shut-off valve and a liquid supply module. The refrigerant circulation module is used for circulating a refrigerant. The refrigerant circulation module comprises a square valve, a compressor, a first heat exchanger, a second heat exchanger, a third heat exchanger and an expansion device. The square valve includes a first interface, a second interface, a third interface, and a fourth interface. The first interface, the compressor, the first heat exchanger and the second interface are connected in series. The third interface, the second heat exchanger, the expansion device, the third heat exchanger, and the fourth interface are sequentially connected in series. The first shut-off valve is disposed between the expansion device and the third heat exchanger. The second shut-off valve is disposed between the third heat exchanger and the fourth interface. The third shut-off valve has a first end connected to the expansion device and the first shut-off valve, and a second end connected between the second shut-off valve and the fourth port. The liquid supply module is connected to the first heat exchanger.

The control method of the heat pump air conditioning system according to an embodiment of the present proposal includes the following steps. A heat pump air conditioning system as described above is provided. The first shut-off valve and the third shut-off valve are closed, the second shut-off valve is opened, and the first interface is connected to the fourth interface, and the second interface is connected to the third interface. Operating the compressor to cause the refrigerant located in the third heat exchanger to sequentially flow through the second shut-off valve, the fourth interface, the first interface, the compressor, the first heat exchanger, the second interface, and the third interface Two heat exchangers. When the compressor is operated to a preset state, the first shut-off valve and the second shut-off valve are closed, the liquid supply module, the third shut-off valve and the second heat exchanger are turned on, and the first interface and the third interface are The interface is connected, and the second interface is connected to the fourth interface. Operating the compressor to sequentially flow the refrigerant from the compressor through the first heat exchanger, the second interface, the fourth interface, the third shut-off valve, the expansion device, the second heat exchanger, the third interface, and the first interface Flow back to the compressor. The refrigerant is exothermic in the first heat exchanger and absorbs heat in the second heat exchanger.

The control method of the heat pump air conditioning system according to an embodiment of the present proposal includes the following steps. A heat pump air conditioning system as described above is provided. Closing the third shut-off valve, opening the first shut-off valve, the second shut-off valve, the second heat exchanger and the third heat exchanger, and connecting the first interface with the fourth interface, and making the second interface and the second interface The three interfaces are connected. Operating the compressor to sequentially flow refrigerant from the compressor through the first heat exchanger, the second interface, the third interface, the second heat exchanger, the expansion device, the first shut-off valve, the third heat exchanger, and the second The shut-off valve, the fourth interface, and the first interface flow back to the compressor. The refrigerant is exothermic in the second heat exchanger and absorbs heat in the third heat exchanger.

The control method of the heat pump air conditioning system according to an embodiment of the present proposal includes the following steps. A heat pump air conditioning system as described above is provided. Closing the third shut-off valve, opening the first shut-off valve, the second shut-off valve, the second heat exchanger and the third heat exchanger, and connecting the first interface with the third interface, and making the second interface and the second interface Four interfaces are connected. Operating the compressor to sequentially flow refrigerant from the compressor through the first heat exchanger, the second port, the fourth port, the second shut-off valve, the third heat exchanger, the first shut-off valve, the expansion device, and the second The heat exchanger, the third interface, and the first interface flow back to the compressor. The refrigerant absorbs heat in the second heat exchanger and exotherms in the third heat exchanger.

The heat pump air-conditioning system and the control method thereof according to an embodiment of the present invention are capable of switching the first, second and third shut-off valves and the square valve when switching the mode of the heat pump air-conditioning system, and extracting the pipeline to be shut down The refrigerant in the pipeline will still be in operation, thereby avoiding the problem of insufficient refrigerant in the operating pipeline, thereby increasing the coefficient of performance of the system.

The above description of the contents of this proposal and the following description of the implementation of the proposal are used to demonstrate and explain the spirit and principle of this proposal, and provide a further explanation of the scope of the patent application of this proposal.

The detailed features and advantages of the embodiments of the present invention are described in detail in the following detailed description of the embodiments of the present invention. The content, the scope of the patent application and the schema, any person skilled in the art can easily understand the purpose and advantages of this proposal. The following examples further illustrate the views of this proposal in detail, but do not limit the scope of this proposal by any point of view.

Referring to FIG. 1, a structural configuration diagram of a heat pump air conditioning system 1 according to an embodiment of the present proposal is shown.

In this embodiment, the heat pump air conditioning system 1 includes a refrigerant circulation module 10, a first shutoff valve 21, a second shutoff valve 22, a third shutoff valve 23, a liquid supply module 30, and a Control device 40.

The refrigerant circulation module 10 is configured to circulate a refrigerant. The refrigerant circulation module 10 includes a square valve 11, a compressor 12, a first heat exchanger 13, a second heat exchanger 14, an expansion device 15, and a third heat exchanger 16.

The four-way valve 11 of the present embodiment is also known as a four-way valve, and includes a first interface 111, a second interface 112, a third interface 113 and a fourth interface 114. The first interface 111, the compressor 12, the first heat exchanger 13, and the second interface 112 are sequentially connected in series through a refrigerant line. The third interface 113, the second heat exchanger 14, the expansion device 15, the third heat exchanger 16, and the fourth interface 114 are also serially connected in series through a refrigerant line.

The communication state in the square valve 11 can be switched such that the first interface 111 is in communication with the fourth interface 114 and the second interface 112 is in communication with the third interface 113, or can be switched such that the first interface 111 is in communication with the third interface 113 and the second interface 112 is in communication with the fourth interface 114. In addition, the communication state in the square valve 11 may be closed by the first interface 111 and the second interface 112, and may be closed by the third interface 113 and the fourth interface 114.

The compressor 12 of the present embodiment allows the refrigerant to flow from the compressor 12 to the first heat exchanger.

The first heat exchanger 13 of this embodiment may be a liquid heat exchanger. The refrigerant in the first heat exchanger 13 can exchange heat with a liquid fluid, which can be, for example, water.

The second heat exchanger 14 of the present embodiment may be a gas heat exchanger disposed outdoors. The second heat exchanger 14 can include an outdoor fan 141. The refrigerant in the second heat exchanger 14 can exchange heat with a gaseous fluid, which can be, for example, a gas stream generated by the operation of the outdoor fan 141.

The third heat exchanger 16 of the present embodiment may be a gas heat exchanger disposed indoors. The third heat exchanger 16 can include an indoor fan 161. The refrigerant in the third heat exchanger 16 can exchange heat with a gaseous fluid, which can be, for example, a gas stream generated by the operation of the indoor fan 161. In addition, the third heat exchanger 16 may also include a refrigerant pressure sensor (not shown) to detect the pressure of the refrigerant in the third heat exchanger 16.

The expansion device 15 of the present embodiment may be, but not limited to, an expansion valve or a capillary tube.

The first shut-off valve 21 is disposed between the expansion device 15 and the third heat exchanger 16 through a refrigerant line. The second shut-off valve 22 is disposed between the third heat exchanger 16 and the fourth port 114 of the square valve 11 through a refrigerant line. The third shut-off valve 23 has a first end 231 and a second end 232. The first end 231 is connected between the expansion device 15 and the first shut-off valve 21 through a refrigerant line. The second end 232 is coupled between the second shut-off valve 22 and the fourth port 114 of the square valve 11 through a refrigerant line.

The liquid supply module 30 includes a liquid displacing device 31, a liquid storage device 32, an inlet pipe 33 and an outlet pipe 34. The liquid storage device 32 can be used to store a liquid such as water. The liquid inlet pipe 33 and the liquid discharge pipe 34 are connected to the liquid discharge device 31, and the liquid inlet pipe 33 and the liquid discharge pipe 34 are simultaneously connected to the liquid storage device 32. The liquid supply module 30 is connected to the first heat exchanger 13 such that the discharge pipe 34 passes through the first heat exchanger 13.

The flooding device 31 can drive the liquid to circulate between the first heat exchanger 13 and the liquid storage device 32. In detail, the liquid displacing device 31 can drive the liquid from the liquid storage device 32 through the liquid inlet pipe 33 to the liquid rushing device 31, and then through the liquid discharge pipe 34 to pass through the first heat exchanger 13, with the first heat. The refrigerant in the exchanger 13 is subjected to heat exchange and then returned to the liquid storage device 32.

The flooding device 31 may include a variable frequency pump, or may include a frequency pump and a three-way linear valve to adjust the flow rate of the fluid flowing into the first heat exchanger 13 for heat exchange.

The control device 40 is electrically connected to the square valve 11, the compressor 12, the first heat exchanger 13, the second heat exchanger 14, the expansion device 15, the third heat exchanger 16, the first shutoff valve 21, and the second shutoff The valve 22, the third shutoff valve 23, and the liquid repellency device 31. The control device 40 is used to control the operation of various components within the heat pump air conditioning system 1.

Next, various control types of the heat pump air conditioning system 1 of the present proposal will be described.

2A and 2B are schematic diagrams showing a first control type of the heat pump air conditioning system 1 of FIG. 1. The first control type of the heat pump air conditioning system 1 of the present embodiment may include a shutdown mode, a pump set mode, and a pure heat pump mode. The heat pump air conditioning system 1 can be switched to the pump set mode before switching from the shutdown mode in which all components are turned off to the pure heat pump mode. The shutdown mode, pump set mode, and pure heat pump mode of the heat pump air conditioning system 1 can also be performed separately. In this embodiment, the heat pump air conditioning system 1 can be controlled by the following steps.

First, the heat pump air conditioning system 1 in the shutdown mode as described above is provided. Next, the control device 40 is caused to close the first shutoff valve 21 and the third shutoff valve 23, open the second shutoff valve 22, and switch the square valve 11. At this time, the control device 40 switches the communication state in the square valve 11 to the first interface 111 to communicate with the fourth interface 114, and the second interface 112 to communicate with the third interface 113.

As shown in FIG. 2A, the control device 40 operates the compressor 12 to cause the refrigerant between the first shut-off valve 21 and the third heat exchanger 16 and the refrigerant located in the third heat exchanger 16 to flow through the second shut-off. The valve 22 also flows to the fourth interface 114 of the square valve 11. The refrigerant in the refrigerant line between the third shut-off valve 23 and the fourth port 114 of the square valve 11 also flows to the fourth port 114. The two refrigerants are merged to the fourth port 114 of the square valve 11, and sequentially flow through the first port 111 of the square valve 11, the compressor 12, the first heat exchanger 13, the second port 112 of the square valve 11, and the square valve. The third interface 113 of 11 is to the second heat exchanger 14.

Since the refrigerant piping space in the second heat exchanger 14 is large, a large amount of refrigerant can be stored. Moreover, since the operation of the compressor 12 forces the flow of the refrigerant, the refrigerant does not flow back to the third heat exchanger 16 disposed inside the chamber.

At this time, the liquid discharge device 31 of the liquid supply module 30 can be in a closed state, so that the refrigerant does not undergo heat exchange when flowing through the first heat exchanger 13. In other embodiments, the liquid rinsing device 31 of the liquid supply module 30 can also be opened, so that the refrigerant flowing through the first heat exchanger 13 can release the liquid in the liquid discharge pipe 34. The liquid heated by the refrigerant can be returned to the liquid storage device 32 to raise the overall temperature of the liquid in the liquid storage device 32.

As shown in FIG. 2B, when operating the compressor 12 to a predetermined state, the control device 40 can switch the heat pump air conditioning system 1 from the pumping mode to the pure heat pump mode. Wherein, the preset state includes a specified time, or the pressure of the refrigerant contained in the third heat exchanger 16 is lower than a specified pressure, and the specified pressure may be greater than one atmosphere to prevent leakage of the refrigerant. In other words, after the control device 40 operates the compressor 12 in the pumping mode for a specified time, it indicates that the refrigerant content in the third heat exchanger 16 is low, and the heat pump air conditioning system 1 can be switched to the pure heat pump mode. Alternatively, the control device 40 operates the compressor 12 in the pumping mode until the refrigerant pressure sensor of the third heat exchanger 16 detects that the pressure of the refrigerant located in the third heat exchanger 16 is lower than a specified pressure, indicating The refrigerant content in the third heat exchanger 16 is low, and the heat pump air conditioning system 1 can be switched to the pure heat pump mode. In the pure heat pump mode, the heat pump air conditioning system 1 can be controlled by the following steps.

The control device 40 closes the first shut-off valve 21 and the second shut-off valve 22, opens the liquid-discharging device 31, the third shut-off valve 23 and the second heat exchanger 14 of the liquid supply module 30, and switches the square valve 11 . At this time, the control device 40 switches the communication state in the square valve 11 to the first interface 111 to communicate with the third interface 113, and the second interface 112 to communicate with the fourth interface 114. The control device 40 operates the compressor 12 to sequentially flow the refrigerant from the compressor 12 through the first heat exchanger 13, the second port 112 of the square valve 11, the fourth port 114 of the square valve 11, and the third shut-off valve 23. The expansion device 15, the second heat exchanger 14, the third port 113 of the square valve 11, and the first port 111 of the square valve 11 flow back to the compressor 12 to complete a single refrigerant cycle.

The flooding device 31 drives the liquid to circulate between the first heat exchanger 13 and the liquid storage device 32. At this time, the refrigerant in the first heat exchanger 13 can release the liquid in the liquid discharge pipe 34. The liquid heated by the refrigerant can be returned to the liquid storage device 32 to raise the overall temperature of the liquid in the liquid storage device 32. When the refrigerant flows through the second heat exchanger 14, the refrigerant absorbs heat, and the outdoor fan 141 of the second heat exchanger 14 can discharge the heat by the refrigerant and the cooled gas is discharged to the outside. Therefore, in the heat pump air conditioning system 1, hot water can be supplied to the liquid storage device 32, and the demand of the user's pure heat pump can be achieved.

Since the pure heat pump mode means that only the hot water demand is provided without providing the air conditioning or heating demand, the third heat exchanger 16 for changing the indoor temperature is generally not operated, and thus the third heat exchanger 16 is turned off and a refrigerant line in the vicinity. When the heat pump air conditioning system 1 is switched to the pure heat pump mode, if the refrigerant in the refrigerant line in and near the third heat exchanger 16 is transferred to the second heat exchanger 14, the subsequent pure heat pump can be avoided. The problem of insufficient refrigerant is encountered in the operation of the model.

Referring to FIG. 3A, FIG. 3B and FIG. 3C, a second control type diagram of the heat pump air conditioning system 1 of FIG. 1 is illustrated. The second control mode of the heat pump air conditioning system 1 of the present embodiment may include a pure cold air mode, a pump set mode, and a pure heat pump mode, wherein the pump set mode shown in FIG. 3B is similar to the pump set mode shown in FIG. 2A, FIG. 3C The pure heat pump mode shown is similar to the pure heat pump mode shown in Figure 2B. The pure air-conditioning mode, pump set mode, and pure heat pump mode of the heat pump air conditioning system 1 can also be performed separately. In this embodiment, the heat pump air conditioning system 1 can be controlled by the following steps.

As shown in Fig. 3A, first, in the pure cold air mode, the heat pump air conditioning system 1 as described above is provided. Next, the control device 40 is caused to close the third shut-off valve 23, open the first shut-off valve 21, the second shut-off valve 22, the second heat exchanger 14, and the third heat exchanger 16, and switch the square valve 11. At this time, the control device 40 switches the communication state in the square valve 11 to the first interface 111 to communicate with the fourth interface 114, and the second interface 112 to communicate with the third interface 113. The control device 40 operates the compressor 12 to sequentially flow the refrigerant from the compressor 12 through the first heat exchanger 13, the second port 112 of the square valve 11, the third port 113 of the square valve 11, and the second heat exchanger 14. The expansion device 15, the first shut-off valve 21, the third heat exchanger 16, the second shut-off valve 22, the fourth interface 114 of the square valve 11, and the first interface 111 of the square valve 11 flow back to the compressor 12, In turn, a single refrigerant cycle is completed.

Here, since the liquid repellency device 31 is in a closed state, heat is not exchanged when the refrigerant flows through the first heat exchanger 13. When the refrigerant flows through the second heat exchanger 14, the refrigerant exotherms, and the outdoor fan 141 of the second heat exchanger 14 can discharge the gas heated by the refrigerant to the outside. When the refrigerant flows through the third heat exchanger 16, the refrigerant absorbs heat, and the indoor fan 161 of the third heat exchanger 16 can discharge the heat that is cooled by the refrigerant and the cooled gas is discharged into the room, thereby providing a requirement for pure cold air.

The heat pump air conditioning system 1 can be switched to the pump set mode before switching from the pure cool air mode to the pure heat pump mode. In the pumping mode, the control device 40 closes the first shut-off valve 21 and the third shut-off valve 23, opens the second shut-off valve 22, and switches the square valve 11. At this time, the control device 40 switches the communication state in the square valve 11 to the first interface 111 to communicate with the fourth interface 114, and the second interface 112 to communicate with the third interface 113.

As shown in FIG. 3B, the control device 40 operates the compressor 12 to cause the refrigerant between the first shut-off valve 21 and the third heat exchanger 16 and the refrigerant located in the third heat exchanger 16 to flow through the second shut-off. The valve 22 also flows to the fourth interface 114 of the square valve 11. The refrigerant in the refrigerant line between the third shut-off valve 23 and the fourth port 114 of the square valve 11 also flows to the fourth port 114. The two refrigerants are merged to the fourth port 114 of the square valve 11, and sequentially flow through the first port 111 of the square valve 11, the compressor 12, the first heat exchanger 13, the second port 112 of the square valve 11, and the square valve. The third interface 113 of 11 is to the second heat exchanger 14.

Since the refrigerant piping space in the second heat exchanger 14 is large, a large amount of refrigerant can be stored. Moreover, since the operation of the compressor 12 forces the flow of the refrigerant, the refrigerant does not flow back to the third heat exchanger 16 disposed inside the chamber.

At this time, the liquid discharge device 31 of the liquid supply module 30 can be in a closed state, so that the refrigerant does not undergo heat exchange when flowing through the first heat exchanger 13. In other embodiments, the liquid rinsing device 31 of the liquid supply module 30 can also be opened, so that the refrigerant flowing through the first heat exchanger 13 can release the liquid in the liquid discharge pipe 34. The liquid heated by the refrigerant can be returned to the liquid storage device 32 to raise the overall temperature of the liquid in the liquid storage device 32. Thereby, the liquid in the liquid storage device 32 can be preheated.

As shown in FIG. 3C, when operating the compressor 12 to a predetermined state, the control device 40 can switch the heat pump air conditioning system 1 from the pumping mode to the pure heat pump mode. Wherein, the preset state includes a specified time, or the pressure of the refrigerant contained in the third heat exchanger 16 is lower than a specified pressure, and the specified pressure may be greater than one atmosphere to prevent leakage of the refrigerant. In other words, after the control device 40 operates the compressor 12 in the pumping mode for a specified time, it indicates that the refrigerant content in the third heat exchanger 16 is low, and the heat pump air conditioning system 1 can be switched to the pure heat pump mode. Alternatively, the control device 40 operates the compressor 12 in the pumping mode until the refrigerant pressure sensor of the third heat exchanger 16 detects that the pressure of the refrigerant located in the third heat exchanger 16 is lower than a specified pressure, indicating The refrigerant content in the third heat exchanger 16 is low, and the heat pump air conditioning system 1 can be switched to the pure heat pump mode. In the pure heat pump mode, the heat pump air conditioning system 1 can be controlled by the following steps.

The control device 40 closes the first shut-off valve 21 and the second shut-off valve 22, opens the liquid-discharging device 31, the third shut-off valve 23 and the second heat exchanger 14 of the liquid supply module 30, and switches the square valve 11 . At this time, the control device 40 switches the communication state in the square valve 11 to the first interface 111 to communicate with the third interface 113, and the second interface 112 to communicate with the fourth interface 114. The control device 40 operates the compressor 12 to sequentially flow the refrigerant from the compressor 12 through the first heat exchanger 13, the second port 112 of the square valve 11, the fourth port 114 of the square valve 11, and the third shut-off valve 23. The expansion device 15, the second heat exchanger 14, the third port 113 of the square valve 11, and the first port 111 of the square valve 11 flow back to the compressor 12 to complete a single refrigerant cycle.

The flooding device 31 drives the liquid to circulate between the first heat exchanger 13 and the liquid storage device 32. At this time, the refrigerant in the first heat exchanger 13 can release the liquid in the liquid discharge pipe 34. The liquid heated by the refrigerant can be returned to the liquid storage device 32 to raise the overall temperature of the liquid in the liquid storage device 32. When the refrigerant flows through the second heat exchanger 14, the refrigerant absorbs heat, and the outdoor fan 141 of the second heat exchanger 14 can discharge the heat by the refrigerant and the cooled gas is discharged to the outside. Therefore, in the heat pump air conditioning system 1, hot water can be supplied to the liquid storage device 32, and the demand of the user's pure heat pump can be achieved.

Since the pure heat pump mode means that only the hot water demand is provided without providing the air conditioning or heating demand, the third heat exchanger 16 for changing the indoor temperature is generally not operated, and thus the third heat exchanger 16 is turned off and a refrigerant line in the vicinity. When the heat pump air conditioning system 1 is switched to the pure heat pump mode, if the refrigerant in the refrigerant line in and near the third heat exchanger 16 is transferred to the second heat exchanger 14, the subsequent pure heat pump can be avoided. The problem of insufficient refrigerant is encountered in the operation of the model.

Referring to FIG. 4A, FIG. 4B and FIG. 4C, a third control mode diagram of the heat pump air conditioning system 1 of FIG. 1 is illustrated. The third control mode of the heat pump air conditioning system 1 of the present embodiment may include a cold air heat pump composite mode, a pump set mode, and a pure heat pump mode, wherein the pump set mode shown in FIG. 4B is similar to the pump set mode shown in FIG. 2A. The pure heat pump mode shown in 4C is similar to the pure heat pump mode shown in Figure 2B. The air-conditioning heat pump composite mode, pump set mode, and pure heat pump mode of the heat pump air conditioning system 1 can also be performed separately. In this embodiment, the heat pump air conditioning system 1 can be controlled by the following steps.

As shown in Fig. 4A, first, in the cold air heat pump composite mode, the heat pump air conditioning system 1 as described above is provided. Next, the control device 40 is caused to close the third shut-off valve 23, open the first shut-off valve 21, the second shut-off valve 22, the second heat exchanger 14, and the third heat exchanger 16, and switch the square valve 11. At this time, the control device 40 switches the communication state in the square valve 11 to the first interface 111 to communicate with the fourth interface 114, and the second interface 112 to communicate with the third interface 113. The control device 40 operates the compressor 12 to sequentially flow the refrigerant from the compressor 12 through the first heat exchanger 13, the second port 112 of the square valve 11, the third port 113 of the square valve 11, and the second heat exchanger 14. The expansion device 15, the first shut-off valve 21, the third heat exchanger 16, the second shut-off valve 22, the fourth interface 114 of the square valve 11, and the first interface 111 of the square valve 11 flow back to the compressor 12, In turn, a single refrigerant cycle is completed.

In addition, the cold air heat pump composite mode further includes the step of opening the liquid discharge device 31 of the liquid supply module 30. The flooding device 31 drives the liquid to circulate between the first heat exchanger 13 and the liquid storage device 32. At this time, the refrigerant in the first heat exchanger 13 can release the liquid in the liquid discharge pipe 34. The liquid heated by the refrigerant can be returned to the liquid storage device 32 to raise the overall temperature of the liquid in the liquid storage device 32. Therefore, while the heat pump air conditioning system 1 provides the user's air conditioning demand, hot water can also be supplied to the liquid storage device 32, and the demand of the user heat pump can be achieved.

The heat pump air conditioning system 1 can be switched to the pump set mode before switching from the cold air heat pump composite mode to the pure heat pump mode. In the pumping mode, the control device 40 closes the first shut-off valve 21 and the third shut-off valve 23, opens the second shut-off valve 22, and switches the square valve 11. At this time, the control device 40 switches the communication state in the square valve 11 to the first interface 111 to communicate with the fourth interface 114, and the second interface 112 to communicate with the third interface 113.

As shown in FIG. 4B, the control device 40 operates the compressor 12 to cause the refrigerant between the first shut-off valve 21 and the third heat exchanger 16 and the refrigerant located in the third heat exchanger 16 to flow through the second shut-off. The valve 22 also flows to the fourth interface 114 of the square valve 11. The refrigerant in the refrigerant line between the third shut-off valve 23 and the fourth port 114 of the square valve 11 also flows to the fourth port 114. The two refrigerants are merged to the fourth port 114 of the square valve 11, and sequentially flow through the first port 111 of the square valve 11, the compressor 12, the first heat exchanger 13, the second port 112 of the square valve 11, and the square valve. The third interface 113 of 11 is to the second heat exchanger 14.

Since the refrigerant piping space in the second heat exchanger 14 is large, a large amount of refrigerant can be stored. Moreover, since the operation of the compressor 12 forces the flow of the refrigerant, the refrigerant does not flow back to the third heat exchanger 16 disposed inside the chamber.

At this time, the liquid discharge device 31 of the liquid supply module 30 can be in a closed state, so that the refrigerant does not undergo heat exchange when flowing through the first heat exchanger 13. In other embodiments, the liquid rinsing device 31 of the liquid supply module 30 can also be opened, so that the refrigerant flowing through the first heat exchanger 13 can release the liquid in the liquid discharge pipe 34. The liquid heated by the refrigerant can be returned to the liquid storage device 32 to raise the overall temperature of the liquid in the liquid storage device 32. Therefore, when the cold air heat pump composite mode is switched to the pump set mode, the liquid can be continuously heated, and the liquid temperature can be prevented from dropping suddenly.

As shown in FIG. 4C, when operating the compressor 12 to a predetermined state, the control device 40 can switch the heat pump air conditioning system 1 from the pumping mode to the pure heat pump mode. Wherein, the preset state includes a specified time, or the pressure of the refrigerant contained in the third heat exchanger 16 is lower than a specified pressure, and the specified pressure may be greater than one atmosphere to prevent leakage of the refrigerant. In other words, after the control device 40 operates the compressor 12 in the pumping mode for a specified time, it indicates that the refrigerant content in the third heat exchanger 16 is low, and the heat pump air conditioning system 1 can be switched to the pure heat pump mode. Alternatively, the control device 40 operates the compressor 12 in the pumping mode until the refrigerant pressure sensor of the third heat exchanger 16 detects that the pressure of the refrigerant located in the third heat exchanger 16 is lower than a specified pressure, indicating The refrigerant content in the third heat exchanger 16 is low, and the heat pump air conditioning system 1 can be switched to the pure heat pump mode. In the pure heat pump mode, the heat pump air conditioning system 1 can be controlled by the following steps.

The control device 40 closes the first shut-off valve 21 and the second shut-off valve 22, opens the liquid-discharging device 31, the third shut-off valve 23 and the second heat exchanger 14 of the liquid supply module 30, and switches the square valve 11 . At this time, the control device 40 switches the communication state in the square valve 11 to the first interface 111 to communicate with the third interface 113, and the second interface 112 to communicate with the fourth interface 114. The control device 40 operates the compressor 12 to sequentially flow the refrigerant from the compressor 12 through the first heat exchanger 13, the second port 112 of the square valve 11, the fourth port 114 of the square valve 11, and the third shut-off valve 23. The expansion device 15, the second heat exchanger 14, the third port 113 of the square valve 11, and the first port 111 of the square valve 11 flow back to the compressor 12 to complete a single refrigerant cycle.

The flooding device 31 drives the liquid to circulate between the first heat exchanger 13 and the liquid storage device 32. At this time, the refrigerant in the first heat exchanger 13 can release the liquid in the liquid discharge pipe 34. The liquid heated by the refrigerant can be returned to the liquid storage device 32 to raise the overall temperature of the liquid in the liquid storage device 32. When the refrigerant flows through the second heat exchanger 14, the refrigerant absorbs heat, and the outdoor fan 141 of the second heat exchanger 14 can discharge the heat by the refrigerant and the cooled gas is discharged to the outside. Therefore, in the heat pump air conditioning system 1, hot water can be supplied to the liquid storage device 32, and the demand of the user's pure heat pump can be achieved.

Since the pure heat pump mode means that only the hot water demand is provided without providing the air conditioning or heating demand, the third heat exchanger 16 for changing the indoor temperature is generally not operated, and thus the third heat exchanger 16 is turned off and a refrigerant line in the vicinity. When the heat pump air conditioning system 1 is switched to the pure heat pump mode, if the refrigerant in the refrigerant line in and near the third heat exchanger 16 is transferred to the second heat exchanger 14, the subsequent pure heat pump can be avoided. The problem of insufficient refrigerant is encountered in the operation of the model.

Referring to FIG. 5A, FIG. 5B and FIG. 5C, a fourth control mode diagram of the heat pump air conditioning system 1 of FIG. 1 is illustrated. The fourth control mode of the heat pump air conditioning system 1 of the present embodiment may include a pure heating mode, a pump set mode, and a pure heat pump mode, wherein the pump set mode shown in FIG. 5B is similar to the pump set mode shown in FIG. 2A, FIG. 5C. The pure heat pump mode shown is similar to the pure heat pump mode shown in Figure 2B. The pure heating mode, pump set mode, and pure heat pump mode of the heat pump air conditioning system 1 can also be performed separately. In this embodiment, the heat pump air conditioning system 1 can be controlled by the following steps.

As shown in Fig. 5A, first, in the pure heating mode, the heat pump air conditioning system 1 as described above is provided. Next, the control device 40 is caused to close the third shut-off valve 23, open the first shut-off valve 21, the second shut-off valve 22, the second heat exchanger 14, and the third heat exchanger 16, and switch the square valve 11. At this time, the control device 40 switches the communication state in the square valve 11 to the first interface 111 to communicate with the third interface 113, and the second interface 112 to communicate with the fourth interface 114. The control device 40 operates the compressor 12 to sequentially flow the refrigerant from the compressor 12 through the first heat exchanger 13, the second port 112 of the square valve 11, the fourth port 114 of the square valve 11, and the second shut-off valve 22 The third heat exchanger 16, the first shutoff valve 21, the expansion device 15, the second heat exchanger 14, the third interface 113 of the square valve 11, and the first interface 111 of the square valve 11 flow back to the compressor 12, In turn, a single refrigerant cycle is completed.

Here, since the liquid repellency device 31 is in a closed state, heat is not exchanged when the refrigerant flows through the first heat exchanger 13. When the refrigerant flows through the second heat exchanger 14, the refrigerant absorbs heat, and the outdoor fan 141 of the second heat exchanger 14 can discharge the heat by the refrigerant and the cooled gas is discharged to the outside. When the refrigerant flows through the third heat exchanger 16, the refrigerant exotherms, and the indoor fan 161 of the third heat exchanger 16 discharges the gas heated by the refrigerant into the room, thereby providing the demand for pure heating.

The heat pump air conditioning system 1 can be switched to the pump set mode before switching from the pure heating mode to the pure heat pump mode. In the pumping mode, the control device 40 closes the first shut-off valve 21 and the third shut-off valve 23, opens the second shut-off valve 22, and switches the square valve 11. At this time, the control device 40 switches the communication state in the square valve 11 to the first interface 111 to communicate with the fourth interface 114, and the second interface 112 to communicate with the third interface 113.

As shown in FIG. 5B, the control device 40 operates the compressor 12 to pass the refrigerant between the first shut-off valve 21 and the third heat exchanger 16 and the refrigerant located in the third heat exchanger 16 through the second shut-off. The valve 22 also flows to the fourth interface 114 of the square valve 11. The refrigerant in the refrigerant line between the third shut-off valve 23 and the fourth port 114 of the square valve 11 also flows to the fourth port 114. The two refrigerants are merged to the fourth port 114 of the square valve 11, and sequentially flow through the first port 111 of the square valve 11, the compressor 12, the first heat exchanger 13, the second port 112 of the square valve 11, and the square valve. The third interface 113 of 11 is to the second heat exchanger 14.

Since the refrigerant piping space in the second heat exchanger 14 is large, a large amount of refrigerant can be stored. Moreover, since the operation of the compressor 12 forces the flow of the refrigerant, the refrigerant does not flow back to the third heat exchanger 16 disposed inside the chamber.

At this time, the liquid discharge device 31 of the liquid supply module 30 can be in a closed state, so that the refrigerant does not undergo heat exchange when flowing through the first heat exchanger 13. In other embodiments, the liquid rinsing device 31 of the liquid supply module 30 can also be opened, so that the refrigerant flowing through the first heat exchanger 13 can release the liquid in the liquid discharge pipe 34. The liquid heated by the refrigerant can be returned to the liquid storage device 32 to raise the overall temperature of the liquid in the liquid storage device 32. Thereby, the liquid in the liquid storage device 32 can be preheated.

As shown in FIG. 5C, when operating the compressor 12 to a predetermined state, the control device 40 can switch the heat pump air conditioning system 1 from the pumping mode to the pure heat pump mode. Wherein, the preset state includes a specified time, or the pressure of the refrigerant contained in the third heat exchanger 16 is lower than a specified pressure, and the specified pressure may be greater than one atmosphere to prevent leakage of the refrigerant. In other words, after the control device 40 operates the compressor 12 in the pumping mode for a specified time, it indicates that the refrigerant content in the third heat exchanger 16 is low, and the heat pump air conditioning system 1 can be switched to the pure heat pump mode. Alternatively, the control device 40 operates the compressor 12 in the pumping mode until the refrigerant pressure sensor of the third heat exchanger 16 detects that the pressure of the refrigerant located in the third heat exchanger 16 is lower than a specified pressure, indicating The refrigerant content in the third heat exchanger 16 is low, and the heat pump air conditioning system 1 can be switched to the pure heat pump mode. In the pure heat pump mode, the heat pump air conditioning system 1 can be controlled by the following steps.

The control device 40 closes the first shut-off valve 21 and the second shut-off valve 22, opens the liquid-discharging device 31, the third shut-off valve 23 and the second heat exchanger 14 of the liquid supply module 30, and switches the square valve 11 . At this time, the control device 40 switches the communication state in the square valve 11 to the first interface 111 to communicate with the third interface 113, and the second interface 112 to communicate with the fourth interface 114. The control device 40 operates the compressor 12 to sequentially flow the refrigerant from the compressor 12 through the first heat exchanger 13, the second port 112 of the square valve 11, the fourth port 114 of the square valve 11, and the third shut-off valve 23. The expansion device 15, the second heat exchanger 14, the third port 113 of the square valve 11, and the first port 111 of the square valve 11 flow back to the compressor 12 to complete a single refrigerant cycle.

The flooding device 31 drives the liquid to circulate between the first heat exchanger 13 and the liquid storage device 32. At this time, the refrigerant in the first heat exchanger 13 can release the liquid in the liquid discharge pipe 34. The liquid heated by the refrigerant can be returned to the liquid storage device 32 to raise the overall temperature of the liquid in the liquid storage device 32. When the refrigerant flows through the second heat exchanger 14, the refrigerant absorbs heat, and the outdoor fan 141 of the second heat exchanger 14 can discharge the heat by the refrigerant and the cooled gas is discharged to the outside. Therefore, in the heat pump air conditioning system 1, hot water can be supplied to the liquid storage device 32, and the demand of the user's pure heat pump can be achieved.

Since the pure heat pump mode means that only the hot water demand is provided without providing the air conditioning or heating demand, the third heat exchanger 16 for changing the indoor temperature is generally not operated, and thus the third heat exchanger 16 is turned off and a refrigerant line in the vicinity. When the heat pump air conditioning system 1 is switched to the pure heat pump mode, if the refrigerant in the refrigerant line in and near the third heat exchanger 16 is transferred to the second heat exchanger 14, the subsequent pure heat pump can be avoided. The problem of insufficient refrigerant is encountered in the operation of the model.

Referring to FIG. 6A, FIG. 6B and FIG. 6C, a fifth control mode diagram of the heat pump air conditioning system 1 of FIG. 1 is illustrated. The fifth control mode of the heat pump air conditioning system 1 of the present embodiment may include a heating heat pump composite mode, a pump set mode, and a pure heat pump mode, wherein the pump set mode shown in FIG. 6B is similar to the pump set mode shown in FIG. 2A. The pure heat pump mode shown in 6C is similar to the pure heat pump mode shown in Figure 2B. The heat pump heat pump composite mode, pump set mode and pure heat pump mode of the heat pump air conditioning system 1 can also be performed separately. In this embodiment, the heat pump air conditioning system 1 can be controlled by the following steps.

As shown in Fig. 6A, first, in the heating heat pump composite mode, the heat pump air conditioning system 1 as described above is provided. Next, the control device 40 is caused to close the third shut-off valve 23, open the first shut-off valve 21, the second shut-off valve 22, the second heat exchanger 14, and the third heat exchanger 16, and switch the square valve 11. At this time, the control device 40 switches the communication state in the square valve 11 to the first interface 111 to communicate with the third interface 113, and the second interface 112 to communicate with the fourth interface 114. The control device 40 operates the compressor 12 to sequentially flow the refrigerant from the compressor 12 through the first heat exchanger 13, the second port 112 of the square valve 11, the fourth port 114 of the square valve 11, and the second shut-off valve 22 The third heat exchanger 16, the first shutoff valve 21, the expansion device 15, the second heat exchanger 14, the third interface 113 of the square valve 11, and the first interface 111 of the square valve 11 flow back to the compressor 12, In turn, a single refrigerant cycle is completed.

In addition, the heating heat pump composite mode further includes the step of opening the liquid discharge device 31 of the liquid supply module 30. The flooding device 31 drives the liquid to circulate between the first heat exchanger 13 and the liquid storage device 32. At this time, the refrigerant in the first heat exchanger 13 can release the liquid in the liquid discharge pipe 34. The liquid heated by the refrigerant can be returned to the liquid storage device 32 to raise the overall temperature of the liquid in the liquid storage device 32. Therefore, while the heat pump air conditioning system 1 provides the user's heating demand, hot water can also be supplied to the liquid storage device 32, and the demand of the user heat pump can be achieved.

The heat pump air conditioning system 1 can be switched to the pump set mode before switching from the heating heat pump composite mode to the pure heat pump mode. In the pumping mode, the control device 40 closes the first shut-off valve 21 and the third shut-off valve 23, opens the second shut-off valve 22, and switches the square valve 11. At this time, the control device 40 switches the communication state in the square valve 11 to the first interface 111 to communicate with the fourth interface 114, and the second interface 112 to communicate with the third interface 113.

As shown in FIG. 6B, the control device 40 operates the compressor 12 to cause the refrigerant between the first shut-off valve 21 and the third heat exchanger 16 and the refrigerant located in the third heat exchanger 16 to flow through the second shut-off. The valve 22 also flows to the fourth interface 114 of the square valve 11. The refrigerant in the refrigerant line between the third shut-off valve 23 and the fourth port 114 of the square valve 11 also flows to the fourth port 114. The two refrigerants are merged to the fourth port 114 of the square valve 11, and sequentially flow through the first port 111 of the square valve 11, the compressor 12, the first heat exchanger 13, the second port 112 of the square valve 11, and the square valve. The third interface 113 of 11 is to the second heat exchanger 14.

Since the refrigerant piping space in the second heat exchanger 14 is large, a large amount of refrigerant can be stored. Moreover, since the operation of the compressor 12 forces the flow of the refrigerant, the refrigerant does not flow back to the third heat exchanger 16 disposed inside the chamber.

At this time, the liquid discharge device 31 of the liquid supply module 30 can be in a closed state, so that the refrigerant does not undergo heat exchange when flowing through the first heat exchanger 13. In other embodiments, the liquid rinsing device 31 of the liquid supply module 30 can also be opened, so that the refrigerant flowing through the first heat exchanger 13 can release the liquid in the liquid discharge pipe 34. The liquid heated by the refrigerant can be returned to the liquid storage device 32 to raise the overall temperature of the liquid in the liquid storage device 32. Therefore, when the heating heat pump composite mode is switched to the pumping mode, the liquid can be continuously heated, and the sudden drop of the liquid temperature can be avoided.

As shown in FIG. 6C, when operating the compressor 12 to a predetermined state, the control device 40 can switch the heat pump air conditioning system 1 from the pumping mode to the pure heat pump mode. Wherein, the preset state includes a specified time, or the pressure of the refrigerant contained in the third heat exchanger 16 is lower than a specified pressure, and the specified pressure may be greater than one atmosphere to prevent leakage of the refrigerant. In other words, after the control device 40 operates the compressor 12 in the pumping mode for a specified time, it indicates that the refrigerant content in the third heat exchanger 16 is low, and the heat pump air conditioning system 1 can be switched to the pure heat pump mode. Alternatively, the control device 40 operates the compressor 12 in the pumping mode until the refrigerant pressure sensor of the third heat exchanger 16 detects that the pressure of the refrigerant located in the third heat exchanger 16 is lower than a specified pressure, indicating The refrigerant content in the third heat exchanger 16 is low, and the heat pump air conditioning system 1 can be switched to the pure heat pump mode. In the pure heat pump mode, the heat pump air conditioning system 1 can be controlled by the following steps.

The control device 40 closes the first shut-off valve 21 and the second shut-off valve 22, opens the liquid-discharging device 31, the third shut-off valve 23 and the second heat exchanger 14 of the liquid supply module 30, and switches the square valve 11 . At this time, the control device 40 switches the communication state in the square valve 11 to the first interface 111 to communicate with the third interface 113, and the second interface 112 to communicate with the fourth interface 114. The control device 40 operates the compressor 12 to sequentially flow the refrigerant from the compressor 12 through the first heat exchanger 13, the second port 112 of the square valve 11, the fourth port 114 of the square valve 11, and the third shut-off valve 23. The expansion device 15, the second heat exchanger 14, the third port 113 of the square valve 11, and the first port 111 of the square valve 11 flow back to the compressor 12 to complete a single refrigerant cycle.

The flooding device 31 drives the liquid to circulate between the first heat exchanger 13 and the liquid storage device 32. At this time, the refrigerant in the first heat exchanger 13 can release the liquid in the liquid discharge pipe 34. The liquid heated by the refrigerant can be returned to the liquid storage device 32 to raise the overall temperature of the liquid in the liquid storage device 32. When the refrigerant flows through the second heat exchanger 14, the refrigerant absorbs heat, and the outdoor fan 141 of the second heat exchanger 14 can discharge the heat by the refrigerant and the cooled gas is discharged to the outside. Therefore, in the heat pump air conditioning system 1, hot water can be supplied to the liquid storage device 32, and the demand of the user's pure heat pump can be achieved.

Since the pure heat pump mode means that only the hot water demand is provided without providing the air conditioning or heating demand, the third heat exchanger 16 for changing the indoor temperature is generally not operated, and thus the third heat exchanger 16 is turned off and a refrigerant line in the vicinity. When the heat pump air conditioning system 1 is switched to the pure heat pump mode, if the refrigerant in the refrigerant line in and near the third heat exchanger 16 is transferred to the second heat exchanger 14, the subsequent pure heat pump can be avoided. The problem of insufficient refrigerant is encountered in the operation of the model.

Referring to Table 1, the following will explain the effect of the operating time of the pump set mode on the coefficient of performance of the pure heat pump mode when the modes are switched to the pump set mode and then switched to the pure heat pump mode. Among them, the heat pump air conditioning system 1 has a heating capacity of 6 kW in the pure heat pump mode.

As shown in Table 1, when only the pure heat pump mode is operated and the setting of the third heat exchanger 16 is never operated, the coefficient of performance (COP) of the heat pump air conditioning system 1 is 4.16, and this is taken as a follow-up. Discuss the benchmark for the coefficient of performance. When switching to the pure heat pump mode after operating the pure air-conditioning mode, that is, when the pump set mode operation time is 0 seconds, the performance coefficient of the heat pump air-conditioning system 1 is 3.02, which is only about 72.6 percent of the reference. When the pure air-conditioning mode is switched to the pump set mode and then switched to the pure heat pump mode state, when the pump set mode operates for 5 seconds, the heat pump air-conditioning system 1 has a coefficient of performance of 3.51, which is about the reference percentage. 84.4. When the pump set mode operation time is 7 seconds, the heat pump air conditioning system 1 has a coefficient of performance of 3.96, which is about 95.2 percent of the reference. When the pump set mode operation time is 8 seconds, the heat pump air conditioning system 1 has a coefficient of performance of 3.99, which has reached 95.9 percent of the benchmark.

Therefore, it can be seen from the above experiments that the design and control method of the heat pump air conditioning system 1 of the present proposal can effectively improve the performance coefficient of the system.

In summary, the heat pump air conditioning system and the control method thereof according to the embodiment of the present invention can switch the first, second and third shut-off valves and the square valve when switching the mode of the heat pump air-conditioning system, and the extraction is about to be closed. The refrigerant in the operating pipeline is in the pipeline that will still operate, thereby avoiding the problem of insufficient refrigerant in the operating pipeline, thereby increasing the performance coefficient of the system.

Although this proposal is disclosed above in the foregoing embodiments, it is not intended to limit the proposal. All changes and refinements are within the scope of the patent protection of this proposal without departing from the spirit and scope of this proposal. Please refer to the attached patent application scope for the scope of protection defined in this proposal.

1‧‧‧Heat pump air conditioning system
10‧‧‧Refrigerant circulation module
11‧‧‧tetragonal valve
111‧‧‧First interface
112‧‧‧second interface
113‧‧‧ third interface
114‧‧‧fourth interface
12‧‧‧Compressor
13‧‧‧First heat exchanger
14‧‧‧second heat exchanger
141‧‧‧Outdoor fan
15‧‧‧Expansion device
16‧‧‧ Third heat exchanger
161‧‧‧ indoor fan
21‧‧‧First shut-off valve
22‧‧‧Second shut-off valve
23‧‧‧ Third shut-off valve
231‧‧‧ first end
232‧‧‧ second end
30‧‧‧liquid supply module
31‧‧‧Liquid device
32‧‧‧Liquid storage device
33‧‧‧Inlet pipe
34‧‧‧Draining tube
40‧‧‧Control device

1 is a structural configuration diagram of a heat pump air conditioning system according to an embodiment of the present proposal. 2A and 2B are schematic diagrams showing a first control type of the heat pump air conditioning system of FIG. 1, wherein FIG. 2A shows a pump set mode, and FIG. 2B shows a pure heat pump mode. 3A, 3B and 3C are schematic diagrams showing a second control mode of the heat pump air conditioning system of Fig. 1, wherein Fig. 3A shows a pure cold air mode, Fig. 3B shows a pump set mode, and Fig. 3C shows a pure heat pump mode. 4A, 4B, and 4C are schematic diagrams showing a third control mode of the heat pump air conditioning system of Fig. 1, wherein Fig. 4A shows a cold air heat pump composite mode, Fig. 4B shows a pump set mode, and Fig. 4C shows a pure heat pump mode. 5A, 5B, and 5C are schematic diagrams showing a fourth control mode of the heat pump air conditioning system of Fig. 1, wherein Fig. 5A shows a pure heating mode, Fig. 5B shows a pumping mode, and Fig. 5C shows a pure heat pump mode. 6A, 6B, and 6C are schematic diagrams showing a fifth control mode of the heat pump air conditioning system of Fig. 1, wherein Fig. 6A shows a heating heat pump composite mode, Fig. 6B shows a pump set mode, and Fig. 6C shows a pure heat pump mode.

1‧‧‧Heat pump air conditioning system

10‧‧‧Refrigerant circulation module

11‧‧‧tetragonal valve

111‧‧‧First interface

112‧‧‧second interface

113‧‧‧ third interface

114‧‧‧fourth interface

12‧‧‧Compressor

13‧‧‧First heat exchanger

14‧‧‧second heat exchanger

141‧‧‧Outdoor fan

15‧‧‧Expansion device

16‧‧‧ Third heat exchanger

161‧‧‧ indoor fan

21‧‧‧First shut-off valve

22‧‧‧Second shut-off valve

23‧‧‧ Third shut-off valve

231‧‧‧ first end

232‧‧‧ second end

30‧‧‧liquid supply module

31‧‧‧Liquid device

32‧‧‧Liquid storage device

33‧‧‧Inlet pipe

34‧‧‧Draining tube

40‧‧‧Control device

Claims (26)

A heat pump air conditioning system includes: a refrigerant circulation module for circulating a refrigerant, the refrigerant circulation module comprising a square valve, a compressor, a first heat exchanger, a second heat exchanger, a third heat exchanger and an expansion device, the square valve includes a first interface, a second interface, a third interface and a fourth interface, the first interface, the compressor, the first The heat exchanger and the second interface are connected in series, the third interface, the second heat exchanger, the expansion device, the third heat exchanger and the fourth interface are connected in series; a first shutdown a valve disposed between the expansion device and the third heat exchanger; a second shut-off valve disposed between the third heat exchanger and the fourth port; a third shut-off valve having a first One end and a second end, the first end is connected between the expansion device and the first shut-off valve, the second end is connected between the second shut-off valve and the fourth interface; a liquid module connected to the first heat exchanger. The heat pump air conditioning system of claim 1, further comprising a control device electrically connected to the square valve, the compressor, the first heat exchanger, the second heat exchanger, the third heat exchanger, the a first shut-off valve, the second shut-off valve, and the third shut-off valve. The heat pump air-conditioning system of claim 1, wherein the liquid supply module comprises a liquid-discharging device, a liquid storage device, an inlet pipe connected to the liquid-discharging device, and an outlet pipe, the liquid inlet pipe and The liquid outlet pipe is connected to the liquid storage device, respectively, and the liquid discharge pipe passes through the first heat exchanger. The heat pump air conditioning system of claim 3, further comprising a control device electrically connected to the square valve, the compressor, the first heat exchanger, the second heat exchanger, the third heat exchanger, the a first shut-off valve, the second shut-off valve, the third shut-off valve, and the flooding device. The heat pump air conditioning system of claim 3, wherein the flooding device comprises a variable frequency pump, or comprises a frequency pump and a three-way linear valve, wherein the flooding device is adapted to adjust to flow into the first heat exchanger. The flow of heat exchange fluid. The heat pump air conditioning system of claim 1, wherein the second heat exchanger comprises an outdoor fan, and the third heat exchanger comprises an indoor fan. The heat pump air conditioning system of claim 1, wherein the communication state within the four-way valve is switchable such that the first interface is in communication with the fourth interface and the second interface is in communication with the third interface, or can be switched to The first interface is in communication with the third interface and the second interface is in communication with the fourth interface. The heat pump air conditioning system of claim 1, wherein the communication state within the four-party valve is that the first interface is closed with the second interface and the third interface is closed with the fourth interface. The heat pump air conditioning system of claim 1, wherein the compressor is configured to flow the refrigerant from the compressor to the first heat exchanger. The heat pump air conditioning system of claim 1, wherein the expansion device is an expansion valve or a capillary. A control method of a heat pump air conditioning system, comprising: providing a heat pump air conditioning system according to any one of claims 1 to 10; closing the first shutoff valve and the third shutoff valve, opening the second shutoff valve, And the first interface is connected to the fourth interface, and the second interface is connected to the third interface; the compressor is operated to cause the refrigerant located in the third heat exchanger to sequentially flow through the second a valve, the fourth interface, the first interface, the compressor, the first heat exchanger, the second interface, the third interface to the second heat exchanger; operating the compressor to a pre- When the state is set, the first shutoff valve and the second shutoff valve are closed, the liquid supply module, the third shutoff valve and the second heat exchanger are turned on, and the first interface and the third Connecting the interface, and connecting the second interface to the fourth interface; and operating the compressor to sequentially flow the refrigerant from the compressor through the first heat exchanger, the second interface, the fourth interface, The third shut-off valve, the expansion device, the second heat exchanger, the third interface, the first interface Back to the compressor where the refrigerant in the first heat exchanger and endothermic heat exchanger to the second. The control method of the heat pump air conditioning system according to claim 11, wherein the preset state comprises a pressure after the specified time or the refrigerant in the third heat exchanger is lower than a specified pressure. The control method of the heat pump air-conditioning system according to claim 11, wherein the liquid supply module comprises a liquid-discharging device, a liquid storage device, a liquid inlet pipe connected to the liquid-discharging device, and a liquid discharge pipe. The liquid pipe and the liquid discharge pipe are respectively connected to the liquid storage device, and the liquid discharge pipe passes through the first heat exchanger. The method of controlling a heat pump air conditioning system according to claim 11, wherein the second heat exchanger comprises an outdoor fan, and the third heat exchanger comprises an indoor fan. A control method of a heat pump air conditioning system, comprising: providing a heat pump air conditioning system according to any one of claims 1 to 10; closing the third shutoff valve, opening the first shutoff valve, the second shutoff valve, The second heat exchanger and the third heat exchanger, and the first interface is in communication with the fourth interface, and the second interface is in communication with the third interface; and the compressor is operated to cause the refrigerant to The compressor sequentially flows through the first heat exchanger, the second interface, the third interface, the second heat exchanger, the expansion device, the first shutoff valve, the third heat exchanger, and the The second shut-off valve, the fourth interface, and the first interface flow back to the compressor, wherein the refrigerant exotherms in the second heat exchanger and absorbs heat in the third heat exchanger. The control method of the heat pump air conditioning system of claim 15, further comprising opening the liquid supply module, wherein the refrigerant exotherms in the first heat exchanger. The control method of the heat pump air conditioning system of claim 15, further comprising: closing the first shutoff valve and the third shutoff valve, opening the second shutoff valve, and causing the first interface and the fourth The interface is connected, and the second interface is connected to the third interface; the compressor is operated to cause the refrigerant located in the third heat exchanger to sequentially flow through the second shut-off valve, the fourth interface, the first An interface, the compressor, the first heat exchanger, the second interface, and the third interface to the second heat exchanger; when the compressor is operated to a preset state, the first shutdown is turned off a valve and the second shut-off valve, the liquid supply module, the third shut-off valve and the second heat exchanger are opened, and the first interface is connected to the third interface, and the second interface is The fourth interface is in communication; and operating the compressor to sequentially flow the refrigerant from the compressor through the first heat exchanger, the second interface, the fourth interface, the third shut-off valve, and the expansion device The second heat exchanger, the third interface, and the first interface flow back to the compressor, wherein the refrigerant A first heat exchanger and endothermic heat exchanger to the second. The control method of the heat pump air conditioning system according to claim 17, wherein the preset state comprises a pressure after the specified time or the refrigerant in the third heat exchanger is lower than a specified pressure. The method of controlling a heat pump air conditioning system according to claim 15, wherein the liquid supply module comprises a liquid displacing device, a liquid storage device, a liquid inlet pipe connected to the liquid repellent device, and a liquid outlet pipe. The liquid pipe and the liquid discharge pipe are respectively connected to the liquid storage device, and the liquid discharge pipe passes through the first heat exchanger. The method of controlling a heat pump air conditioning system according to claim 15, wherein the second heat exchanger comprises an outdoor fan, and the third heat exchanger comprises an indoor fan. A control method of a heat pump air conditioning system, comprising: providing a heat pump air conditioning system according to any one of claims 1 to 10; closing the third shutoff valve, opening the first shutoff valve, the second shutoff valve, The second heat exchanger and the third heat exchanger, and the first interface is in communication with the third interface, and the second interface is in communication with the fourth interface; and the compressor is operated to cause the refrigerant to The compressor sequentially flows through the first heat exchanger, the second interface, the fourth interface, the second shut-off valve, the third heat exchanger, the first shut-off valve, the expansion device, and the The second heat exchanger, the third interface, and the first interface flow back to the compressor, wherein the refrigerant absorbs heat in the second heat exchanger and exotherms in the third heat exchanger. The control method of the heat pump air conditioning system of claim 21, further comprising: opening the liquid supply module, wherein the refrigerant exotherms in the first heat exchanger. The control method of the heat pump air conditioning system of claim 21, further comprising: closing the first shutoff valve and the third shutoff valve, opening the second shutoff valve, and causing the first interface and the fourth The interface is connected, and the second interface is connected to the third interface; the compressor is operated to cause the refrigerant located in the third heat exchanger to sequentially flow through the second shut-off valve, the fourth interface, the first An interface, the compressor, the first heat exchanger, the second interface, and the third interface to the second heat exchanger; when the compressor is operated to a preset state, the first shutdown is turned off a valve and the second shut-off valve, the liquid supply module, the third shut-off valve and the second heat exchanger are opened, and the first interface is connected to the third interface, and the second interface is The fourth interface is in communication; and operating the compressor to sequentially flow the refrigerant from the compressor through the first heat exchanger, the second interface, the fourth interface, the third shut-off valve, and the expansion device The second heat exchanger, the third interface, and the first interface flow back to the compressor, wherein the refrigerant A first heat exchanger and endothermic heat exchanger to the second. The control method of the heat pump air conditioning system according to claim 23, wherein the preset state comprises a pressure after the specified time or the refrigerant in the third heat exchanger is lower than a specified pressure. The control method of the heat pump air-conditioning system according to claim 21, wherein the liquid supply module comprises a liquid-discharging device, a liquid storage device, an inlet pipe connected to the liquid-discharging device, and an outlet pipe, the inlet The liquid pipe and the liquid discharge pipe are respectively connected to the liquid storage device, and the liquid discharge pipe passes through the first heat exchanger. The method of controlling a heat pump air conditioning system according to claim 21, wherein the second heat exchanger comprises an outdoor fan, and the third heat exchanger comprises an indoor fan.