CN112303955B

CN112303955B - Heat pump system, control method and control device thereof, air conditioning equipment and storage medium

Info

Publication number: CN112303955B
Application number: CN202011294377.4A
Authority: CN
Inventors: 杨智峰
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2024-05-24
Anticipated expiration: 2040-11-18
Also published as: CN112303955A

Abstract

The invention relates to a heat pump system, a control method and a control device thereof, an air conditioning device and a storage medium. The heat pump system comprises a compressor, an indoor heat exchanger, a first outdoor heat exchanger, a second outdoor heat exchanger and a switching device, wherein a second port of the indoor heat exchanger is connected with a second port of the first outdoor heat exchanger through a first pipeline, a second port of the second outdoor heat exchanger is connected with the first pipeline through a second pipeline, the switching device is connected with an exhaust port and an air suction port of the compressor and the first port of the indoor heat exchanger, the first port of the first outdoor heat exchanger and the first port of the second outdoor heat exchanger, and is configured to control one of the first outdoor heat exchanger and the second outdoor heat exchanger to be in a condenser mode and the other of the first outdoor heat exchanger and the second outdoor heat exchanger to be in an evaporator mode when the heat pump system is in a defrosting mode. Based on the method, the problem of indoor temperature imbalance in the defrosting process can be improved.

Description

Heat pump system, control method and control device thereof, air conditioning equipment and storage medium

Technical Field

The present invention relates to the field of air conditioning apparatuses, and in particular, to a heat pump system, a control method and a control device thereof, an air conditioning apparatus, and a storage medium.

Background

Compared with an electric heating system, the heat pump technology has the advantages of lower energy consumption and the like, so that the heat pump technology is applied to various air conditioning products, but is limited in application in occasions with higher requirements on temperature precision, such as a constant temperature and humidity machine and the like, and one of the important reasons is that the conventional heat pump system has the problem of indoor temperature imbalance in the defrosting process.

Specifically, when the heat pump system is in heating operation, at certain outdoor temperatures, the outdoor heat exchanger can be frosted, the frosting can lead to the performance reduction of the outdoor heat exchanger, the heat exchanger air duct is blocked, the heating quantity of the heat pump system is reduced, and when the heating quantity is reduced to the condition that the indoor load requirement cannot be met, the heat pump system needs to enter a defrosting mode. When the conventional heat pump system is in defrosting operation, heat required by defrosting of the outdoor heat exchanger is taken indoors, the indoor heat exchanger is switched from a condenser mode to an evaporator mode, and at the moment, the indoor heat exchanger cannot be reheated, so that indoor temperature fluctuation is caused, imbalance occurs, and the temperature control precision requirement is difficult to meet.

Therefore, it is necessary to improve the problem of indoor temperature imbalance of the heat pump system in the defrosting process, so as to improve the temperature control accuracy of the heat pump system, and enable the heat pump system to be applied to occasions with high temperature control accuracy.

Disclosure of Invention

The embodiment of the invention provides a heat pump system, a control method and a control device thereof, air conditioning equipment and a storage medium, so as to solve the problem of indoor temperature imbalance in the defrosting process.

The heat pump system provided by the invention comprises:

A compressor;

an indoor heat exchanger;

A first outdoor heat exchanger;

A second outdoor heat exchanger; and

The switching device is used for controlling the switching of the indoor heat exchanger, the first outdoor heat exchanger and the second outdoor heat exchanger between an evaporator mode and a condenser mode by controlling the on-off relation among a first port of the indoor heat exchanger, a first interface of the first outdoor heat exchanger and a first port of the second outdoor heat exchanger and an exhaust port and an air suction port of the compressor;

The second port of the indoor heat exchanger is connected with the second port of the first outdoor heat exchanger through a first pipeline, and the second port of the second outdoor heat exchanger is connected with the first pipeline through a second pipeline;

The switching device is configured to control one of the first and second outdoor heat exchangers and the indoor heat exchanger to be in a condenser mode and the other of the first and second outdoor heat exchangers to be in an evaporator mode when the heat pump system is in a defrosting mode.

In some embodiments, the switching device comprises:

The first switching valve comprises a first valve port, a second valve port, a third valve port and a fourth valve port, when the first valve port is communicated with one of the second valve port and the third valve port, the fourth valve port is communicated with the other of the second valve port and the third valve port, the first valve port is communicated with the exhaust port, the second valve port is communicated with the first port, the third valve port is connected with the first port through a third pipeline, and the fourth valve port is communicated with the air suction port; and

The second switching valve comprises a first switching port, a second switching port, a third switching port and a fourth switching port, when the first switching port is communicated with one of the second switching port and the third switching port, the fourth switching port is communicated with the other of the second switching port and the third switching port, the first switching port is communicated with the exhaust port, the second switching port is communicated with the first interface, the third switching port is connected with the first port through a fourth pipeline, and the fourth switching port is communicated with the air suction port.

In some embodiments, the switching device further comprises:

the first valve is arranged on the third pipeline and used for controlling the on-off of the third pipeline; and

The second valve is arranged on the fourth pipeline and used for controlling the on-off of the fourth pipeline.

In some embodiments, the first and second pipes are connected at a connection point, the heat pump system further comprising:

The first outdoor throttling piece is arranged on the first pipeline and is positioned between the second interface and the connecting point; and

The second outdoor throttling piece is arranged on the second pipeline.

In some embodiments, the switching device is further configured to at least one of:

When the heat pump system is in a refrigeration mode, controlling the indoor heat exchanger to be in an evaporator mode, and the first outdoor heat exchanger and the second outdoor heat exchanger to be in a condenser mode;

When the heat pump system is in the heating mode, the indoor heat exchanger is controlled to be in the condenser mode, and the first outdoor heat exchanger and the second outdoor heat exchanger are controlled to be in the evaporator mode.

In some embodiments, the compressor is located indoors or outdoors.

In some embodiments, the heat pump system further comprises an inter-tube heat exchanger, wherein a first flow channel and a second flow channel capable of exchanging heat with each other are arranged in the inter-tube heat exchanger, and the first interface and the first port are respectively connected with the switching device through the first flow channel and the second flow channel, or the second interface and the second port are respectively connected with the indoor heat exchanger through the first flow channel and the second flow channel.

In some embodiments, the second port and the second port are connected to the indoor heat exchanger by a first flow passage and a second flow passage, respectively, and the first flow passage is located between a first outdoor restriction and the second port of the heat pump system.

In some embodiments, the inter-tube heat exchanger is located indoors or outdoors.

In some embodiments, the heat pump system further comprises a first outdoor fan and a second outdoor fan, the first outdoor fan and the first outdoor heat exchanger are located in a first air duct, the second outdoor fan and the second outdoor heat exchanger are located in a second air duct, and the first air duct and the second air duct are independently arranged.

The control method of the heat pump system provided by the invention is used for controlling the heat pump system of each embodiment, and comprises the following steps:

determining a target operating mode of the heat pump system;

and controlling the action of the switching device based on the target operation mode.

In some embodiments, controlling the switching device action based on the target operating mode includes at least one of:

When the target operation mode is a defrosting mode, the switching device is controlled to act, so that one of the first outdoor heat exchanger and the second outdoor heat exchanger and the indoor heat exchanger are both in a condenser mode, and the other of the first outdoor heat exchanger and the second outdoor heat exchanger is in an evaporator mode;

when the target operation mode is a refrigeration mode, the switching device is controlled to act, so that the indoor heat exchanger is in an evaporator mode, the first outdoor heat exchanger and the second outdoor heat exchanger are in a condenser mode, or one of the first outdoor heat exchanger and the second outdoor heat exchanger is in the evaporator mode, and the other is in the condenser mode;

when the target operation mode is a heating mode, the switching device is controlled to act, so that the indoor heat exchanger is in a condenser mode, and the first outdoor heat exchanger and the second outdoor heat exchanger are in an evaporator mode, or one of the first outdoor heat exchanger and the second outdoor heat exchanger is in the evaporator mode, and the other is in the condenser mode.

In some embodiments, when the target operation mode is a defrosting mode, controlling the switching device to act so that one of the first outdoor heat exchanger and the second outdoor heat exchanger and the indoor heat exchanger are both in a condenser mode, and the other of the first outdoor heat exchanger and the second outdoor heat exchanger is in an evaporator mode includes at least one of:

when the target operation mode is a first defrosting mode, controlling the switching device to act, so that the second outdoor heat exchanger and the indoor heat exchanger are both in a condenser mode, and the first outdoor heat exchanger is in an evaporator mode;

When the target operation mode is a defrosting mode, the switching device is controlled to act, so that the first outdoor heat exchanger and the indoor heat exchanger are both in a condenser mode, and the second outdoor heat exchanger is in an evaporator mode.

determining a target operating mode of the heat pump system;

the first switching valve, the second switching valve, the first valve, and the second valve actions are controlled based on the target operating mode.

In some embodiments, controlling the first switching valve, the second switching valve, the first valve, and the second valve action based on the target operating mode includes at least one of:

When the target operation mode is a first defrosting mode, a first valve port of a first switching valve is controlled to be communicated with a second valve port, a third valve port of the first switching valve is controlled to be communicated with a fourth valve port, a first switching port of the second switching valve is controlled to be communicated with a third switching port, a second switching port of the second switching valve is controlled to be communicated with a fourth switching port, the first valve is controlled to be closed, the second valve is opened, the second outdoor heat exchanger and the indoor heat exchanger are both in a condenser mode, and the first outdoor heat exchanger is in an evaporator mode;

When the target operation mode is a second defrosting mode, a first valve port of the first switching valve is controlled to be communicated with a third valve port, a second valve port of the first switching valve is controlled to be communicated with a fourth valve port, a first switching port of the second switching valve is controlled to be communicated with a second switching port, a third switching port of the second switching valve is controlled to be communicated with a fourth switching port, the first valve is controlled to be opened, the second valve is closed, the first outdoor heat exchanger and the indoor heat exchanger are both in a condenser mode, and the second outdoor heat exchanger is in an evaporator mode;

When the target operation mode is a first refrigeration mode, a first valve port of a first switching valve is controlled to be communicated with a second valve port, a third valve port of the first switching valve is controlled to be communicated with a fourth valve port, a first switching port of the second switching valve is controlled to be communicated with a second switching port, a third switching port of the second switching valve is controlled to be communicated with a fourth switching port, the first valve and the second valve are controlled to be opened, so that the indoor heat exchanger is in an evaporator mode, and the first outdoor heat exchanger and the second outdoor heat exchanger are in a condenser mode;

when the target operation mode is a second refrigeration mode, a first valve port of the first switching valve is controlled to be communicated with a second valve port, a third valve port of the first switching valve is controlled to be communicated with a fourth valve port, a first switching port of the second switching valve is controlled to be communicated with a third switching port, a second switching port of the second switching valve is controlled to be communicated with a fourth switching port, the first valve is controlled to be opened, the second valve is closed, the indoor heat exchanger and the first outdoor heat exchanger are in an evaporator mode, and the second outdoor heat exchanger is in a condenser mode;

when the target operation mode is a third refrigeration mode, a first valve port of the first switching valve is controlled to be communicated with a third valve port, a second valve port of the first switching valve is controlled to be communicated with a fourth valve port, a first switching port of the second switching valve is controlled to be communicated with a second switching port, a third switching port of the second switching valve is controlled to be communicated with a fourth switching port, the first valve is controlled to be closed, the second valve is opened, the indoor heat exchanger and the second outdoor heat exchanger are in an evaporator mode, and the first outdoor heat exchanger is in a condenser mode;

When the target operation mode is a first heating mode, a first valve port of a first switching valve is controlled to be communicated with a third valve port, a second valve port of the first switching valve is controlled to be communicated with a fourth valve port, a first switching port of a second switching valve is controlled to be communicated with a second switching port, a third switching port of the second switching valve is controlled to be communicated with the fourth switching port, the first valve and the second valve are controlled to be opened, so that the indoor heat exchanger is in a condenser mode, and the first outdoor heat exchanger and the second outdoor heat exchanger are in an evaporator mode;

when the target operation mode is a second heating mode, a first valve port of the first switching valve is controlled to be communicated with a third valve port, a second valve port of the first switching valve is controlled to be communicated with a fourth valve port, a first switching port of the second switching valve is controlled to be communicated with a second switching port, a third switching port of the second switching valve is controlled to be communicated with a fourth switching port, the first valve is controlled to be opened, the second valve is closed, so that the indoor heat exchanger and the first outdoor heat exchanger are both in a condenser mode, and the second outdoor heat exchanger is in an evaporator mode;

When the target operation mode is a third heating mode, the first valve port of the first switching valve is controlled to be communicated with the second valve port, the third valve port is controlled to be communicated with the fourth valve port, the first switching port of the second switching valve is controlled to be communicated with the third switching port, the second switching port is controlled to be communicated with the fourth switching port, the first valve is controlled to be closed, the second valve is opened, the indoor heat exchanger and the second outdoor heat exchanger are both in a condenser mode, and the first outdoor heat exchanger is in an evaporator mode.

The control device of the heat pump system comprises a memory and a processor coupled to the memory, wherein the processor is configured to execute the control method of each embodiment based on instructions stored in the memory.

The air conditioning equipment provided by the invention comprises the heat pump system and the control device of each embodiment.

The computer readable storage medium provided by the present invention stores computer instructions that are executed by a processor to perform the control method of the embodiments.

According to the scheme of the invention, in the defrosting process, the indoor heat exchanger can be always in the condenser mode without being switched to the evaporator mode under the cooperation of the switching device, the first outdoor heat exchanger and the second outdoor heat exchanger, so that the indoor heat exchanger can still heat in the defrosting process and output heating quantity, indoor temperature fluctuation caused in the defrosting process can be reduced, and the problem of indoor temperature imbalance in the defrosting process can be effectively solved.

Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

Fig. 1 is a schematic diagram of a heat pump system according to a first embodiment of the present invention.

Fig. 2 is a schematic structural view of a heat pump system according to a second embodiment of the present invention.

Fig. 3 is a schematic view of a refrigerant flow path of the heat pump system of fig. 2 in a first cooling mode.

Fig. 4 is a schematic view of a refrigerant flow path of the heat pump system of fig. 2 in a second cooling mode.

Fig. 5 is a schematic view of a refrigerant flow path of the heat pump system of fig. 2 in a third cooling mode.

Fig. 6 is a schematic view of a refrigerant flow path of the heat pump system of fig. 2 in a first heating mode.

Fig. 7 is a schematic view of a refrigerant flow path of the heat pump system of fig. 2 in a second heating mode.

Fig. 8 is a schematic view of a refrigerant flow path of the heat pump system of fig. 2 in a third heating mode.

Fig. 9is a schematic view of a refrigerant flow path of the heat pump system of fig. 2 in a first defrosting mode.

Fig. 10 is a schematic view of a refrigerant flow path of the heat pump system of fig. 2 in a second defrosting mode.

Fig. 11 is a schematic structural view of a heat pump system according to a third embodiment of the present invention.

Fig. 12 is a schematic structural view of a heat pump system according to a fourth embodiment of the present invention.

Fig. 13 is a schematic structural view of a heat pump system according to a fifth embodiment of the present invention.

Fig. 14 is a schematic structural view of a heat pump system according to a sixth embodiment of the present invention.

FIG. 15 is a logic block diagram of a method of controlling a heat pump system in accordance with some embodiments of the invention.

Fig. 16 is a schematic diagram of a control device according to some embodiments of the invention.

In the figure:

100. an indoor unit; 200. an outdoor unit; 300. a switching device;

1. a compressor; 10. an air suction port; 11. an exhaust port;

2. A first switching valve; 2D, a first valve port; 2C, a second valve port; 2E, a third valve port; 2S, a fourth valve port;

3. A second switching valve; 3D, first switching port; 3C, a second switching port; 3E, a third switching port; 3S, a fourth switching port;

4. A first valve; 5. a second valve;

7. an indoor fan;

81. A first pipeline; 82. a second pipeline; 83. a third pipeline; 84. a fourth pipeline;

9. An indoor heat exchanger; 9a, a first port; 9b, a second port;

12. an inter-tube heat exchanger; 121. a first flow passage; 122. a second flow passage; q, a first working port; m, a second work port; p, a third working port; n, the fourth work port;

13. an indoor throttle member; 14. a first stop valve; 15. a second shut-off valve;

20. a first outdoor heat exchanger; 20a, a first interface; 20b, a second interface;

21. A second outdoor heat exchanger; 21a, a first port; 21b, a second port;

22. A first outdoor throttle; 23. A second outdoor throttle;

24. a first outdoor fan; 25. A second outdoor fan;

26. A memory; 27. a processor; 28. a communication interface; 29. a bus;

F. The connection point.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on embodiments of the present invention, are within the scope of the present invention.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for defining the components, and are merely for convenience in distinguishing the corresponding components, and the terms are not meant to have any special meaning unless otherwise indicated, so that the scope of the present invention is not to be construed as being limited.

In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.

Fig. 1 to 14 exemplarily show the structure of the heat pump system of the present invention. Fig. 15 exemplarily shows a control method of the present invention. Fig. 16 exemplarily shows a control apparatus of the present invention.

Referring to fig. 1 to 14, the heat pump system provided by the present invention includes a compressor 1, an indoor heat exchanger 9, a first outdoor heat exchanger 20, a second outdoor heat exchanger 21, and a switching device 300.

The compressor 1 compresses a refrigerant. The compressor 1 has a discharge port 11 and an intake port 10. The refrigerant compressed by the compressor 1 is discharged from the discharge port 11. The refrigerant having undergone the cooling or heating cycle flows back to the compressor 1 through the suction port 10, and is compressed by the compressor 1. Referring to fig. 1-11 and 14, in some embodiments, the compressor 1 is disposed indoors, which may reduce the risk of theft of the compressor 1. While, as a modification, referring to fig. 12 and 13, in other embodiments, the compressor 1 may be disposed outdoors.

The indoor heat exchanger 9 is arranged indoors, belongs to a part of an indoor unit, and is used for realizing heat exchange between a refrigerant and indoor air so as to cool or heat the indoor air and realize the purpose of refrigeration or heating. The indoor heat exchanger 9 has a first port 9a and a second port 9b for refrigerant to enter and exit the indoor heat exchanger 9.

Referring to fig. 1-14, in some embodiments, an indoor fan 24 is correspondingly disposed at the indoor heat exchanger 9, so as to promote heat exchange between the refrigerant flowing through the indoor heat exchanger 9 and the indoor air, so as to promote heat exchange effect of the refrigerant at the indoor heat exchanger 9. Meanwhile, the indoor heat exchanger 9 is correspondingly provided with an indoor throttling element 13. The indoor throttle member 13 is connected to the second port 9b for throttling the refrigerant flowing into and out of the indoor heat exchanger 9. The indoor throttle 13 may be various throttle elements such as an electronic expansion valve, a thermal expansion valve, and a throttle plate.

The first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 are disposed outdoors, are part of an outdoor unit, and are used for realizing heat exchange between the refrigerant and the outdoor air, and complete a temperature regulation process together with the indoor heat exchanger 9. The first outdoor heat exchanger 20 has a first port 20a and a second port 20b for refrigerant to enter and exit the first outdoor heat exchanger 20. The second outdoor heat exchanger 21 has a first port 21a and a second port 21b for refrigerant to enter and exit the second outdoor heat exchanger 21. The first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 may be provided in the same outdoor unit, or may be provided in two separate outdoor units. The first stop valve 14 and the second stop valve 15 can be arranged on the pipeline between the outdoor unit and the indoor unit, so that the pipeline between the indoor unit and the outdoor unit can be conveniently disassembled and assembled.

Referring to fig. 1-14, in some embodiments, a first outdoor fan 24 is disposed at the first outdoor heat exchanger 20, so as to promote heat exchange between the refrigerant flowing through the first outdoor heat exchanger 20 and the outdoor air, so as to promote heat exchange effect of the refrigerant at the first outdoor heat exchanger 20. The second outdoor heat exchanger 21 is correspondingly provided with a second outdoor fan 25 for promoting heat exchange between the refrigerant flowing through the second outdoor heat exchanger 21 and the outdoor air so as to promote the heat exchange effect of the refrigerant at the second outdoor heat exchanger 21. The first outdoor fan 24 and the first outdoor heat exchanger 20 may be located in a first air duct, the second outdoor fan 25 and the second outdoor heat exchanger 21 are located in a second air duct, and the first air duct and the second air duct are independently disposed.

In addition, with continued reference to fig. 1-14, in some embodiments, first and second outdoor heat exchangers 20 and 21 are further provided with first and second outdoor throttles 22 and 23, respectively. The first outdoor throttle member 22 and the second outdoor throttle member 23 are connected to the second port 20b and the second port 21b, respectively, for throttling the refrigerant flowing into and out of the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21, respectively. The first outdoor throttle 22 and the second outdoor throttle 23 may be various throttle elements such as an electronic expansion valve, a thermal expansion valve, a throttle orifice plate, and the like.

To improve the problem of indoor temperature imbalance during defrosting and to improve the temperature control accuracy of the heat pump system, referring to fig. 1-14, in some embodiments, the discharge port 11 and the suction port 10 of the compressor 1 are connected to the first port 9a of the indoor heat exchanger 9, the first interface 20a of the first outdoor heat exchanger 20, and the first port 21a of the second outdoor heat exchanger 21 by the switching device 300.

The second port 9b of the indoor heat exchanger 9 is connected to the second port 20b of the first outdoor heat exchanger 20 through the first pipe 81. The second port 21b of the second outdoor heat exchanger 21 is connected to the first pipe 81 through the second pipe 82. The first pipe 81 and the second pipe 82 are connected at a connection point F. In this case, the indoor throttle 13 and the first outdoor throttle 22 are both disposed on the first pipe 81 and located between the second port 9b and the connection point F and between the second port 20b and the connection point F, respectively; the second outdoor throttle 23 is disposed on the second pipeline 82, i.e., between the second port 21b and the connection point F.

The switching device 300 controls switching of the indoor heat exchanger 9, the first outdoor heat exchanger 20, and the second outdoor heat exchanger 21 between the evaporator mode and the condenser mode by controlling the on-off relationship between the first port 9a of the indoor heat exchanger 9, the first interface 20a of the first outdoor heat exchanger 20, and the first port 21a of the second outdoor heat exchanger 21, and the discharge port 11 and the suction port 10 of the compressor 1. The evaporator mode refers to a state when the heat exchanger is used as an evaporator. The condenser mode refers to a state when the heat exchanger is used as a condenser.

Also, the switching device 300 is configured to control one of the first interface 20a and the first port 21a and the first port 9a to communicate with the exhaust port 11 and the other of the first interface 20a and the first port 21a to communicate with the suction port 10, that is, to control one of the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 and the indoor heat exchanger 9 to be in the condenser mode and the other of the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 to be in the evaporator mode, when the heat pump system is in the defrosting mode.

When defrosting is needed, the switching device 300 is controlled to act, so that one of the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 and the indoor heat exchanger 9 are both in the condenser mode, and the other of the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 is in the evaporator mode, so that when defrosting is carried out by one of the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 in the condenser mode, one of the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 in the evaporator mode can provide heat required by defrosting, heat can be absorbed from outside without heat absorption from inside, the indoor heat exchanger 9 is not required to be switched to the evaporator mode any more, and can be kept in the condenser mode, therefore, the problem of indoor temperature fluctuation caused by incapacity of heating when defrosting is carried out by switching the indoor heat exchanger 9 to the evaporator mode can be avoided, the problem of indoor temperature imbalance in the defrosting process is solved, the temperature control constant performance of the heat pump system is effectively improved, the heat pump system can be used in a heat pump constant humidity control range with high precision and the heat pump system can be used in a more effective and temperature and constant-humidity environment, and the heat pump system can be used in a more efficient and temperature-controllable environment.

For example, referring to fig. 9, when the second outdoor heat exchanger 21 needs to defrost, the second outdoor heat exchanger 21 is switched to the condenser mode, and the first outdoor heat exchanger 20 is still kept in the evaporator mode, at this time, the first outdoor heat exchanger 20 in the evaporator mode can absorb heat from the outside to defrost the second outdoor heat exchanger 21 in the condenser mode, so that when the second outdoor heat exchanger 21 is defrosted, the indoor heat exchanger 9 does not need to be switched to the evaporator mode, but can keep the condenser mode to continue heating, thereby not affecting the output of the heating amount of the indoor heat exchanger 9 and improving the stability of the indoor temperature while achieving the defrosting purpose of the second outdoor heat exchanger 21. The defrosting process of the second outdoor heat exchanger 21 may be referred to as a first defrosting mode, in other words, the first defrosting mode refers to an operation mode of the heat pump system when the second outdoor heat exchanger 21 is defrosted.

For another example, referring to fig. 10, when the first outdoor heat exchanger 20 needs to defrost, the first outdoor heat exchanger 20 is switched to the condenser mode, and the second outdoor heat exchanger 21 is still kept in the evaporator mode, at this time, the second outdoor heat exchanger 21 in the evaporator mode can absorb heat from the outside to defrost the first outdoor heat exchanger 20 in the condenser mode, so that when the first outdoor heat exchanger 20 is defrosted, the indoor heat exchanger 9 can still be kept in the condenser mode to continue heating, thereby not affecting the output of the heating amount of the indoor heat exchanger 9 and improving the stability of the indoor temperature while achieving the defrosting purpose of the first outdoor heat exchanger 20. The defrosting process of the first outdoor heat exchanger 20 may be referred to as a second defrosting mode, in other words, the second defrosting mode refers to an operation mode of the heat pump system when the first outdoor heat exchanger 20 is defrosted.

It can be seen that, based on the connection relationship and the mutual coordination among the switching device 300, the first outdoor heat exchanger 20, the second outdoor heat exchanger 21 and the indoor heat exchanger 9, an asynchronous defrosting process (that is, the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 are not simultaneously defrosted) can be realized, so that the indoor heat exchanger 9 can always maintain in the condenser mode in the defrosting mode (including the first defrosting mode and the second defrosting mode), continuously output the heating amount, effectively improve the problem of indoor temperature imbalance in the defrosting process, and improve the temperature control accuracy of the heat pump system.

In addition, during defrosting, the indoor heat exchanger 9 is always in the condenser mode, which is also beneficial in that:

(1) The problem of indoor temperature imbalance of the initial heating stage recovered after defrosting is finished can be solved, and the temperature control accuracy is further improved. In the traditional heat pump system, after the indoor heat exchanger is switched to an evaporator mode in the defrosting process, in order to prevent cold air blowing, the indoor temperature is further reduced, an indoor fan is forced to stop running, the evaporation of the indoor heat exchanger is poor, the liquid return of the system is serious, a large amount of liquid refrigerant exists in a gas-liquid separator, the heating circulation refrigerant is seriously insufficient after defrosting, the heating quantity after defrosting cannot be recovered by 100%, the indoor temperature is still unbalanced after defrosting, namely, the traditional heat pump system has the problem of indoor temperature imbalance in the defrosting process, and the problem of indoor temperature imbalance also exists in the initial stage of heating after defrosting is finished. In the heat pump system provided by the invention, the indoor heat exchanger 9 can be always in the condenser mode in the defrosting process, so that the indoor fan 7 can continuously run without stopping, the problem of insufficient refrigerant in the initial stage of heating after defrosting caused by stopping the indoor fan 7 can be avoided, and the problem of indoor temperature imbalance in the initial stage of heating after defrosting is finished can be effectively improved.

(2) Is beneficial to reducing energy consumption. On the one hand, as the temperature control accuracy of the heat pump system is improved, the application range can be expanded to occasions with higher temperature control accuracy requirements, and the application of the electric heating system in the occasions is reduced, so that the power consumption can be reduced, and the energy consumption is reduced. On the other hand, in the defrosting process, the indoor heat exchanger 9 can be always kept in the condenser mode, so that the problem of indoor temperature imbalance is solved, and therefore, the electric heating system is not required to be used for heating in the defrosting process to assist in adjusting the indoor temperature, and from the perspective, the problem of power consumption increase caused by the electric heating system can be avoided, and the energy consumption is effectively reduced.

Therefore, the heat pump system provided by the invention is an energy-saving heat pump system capable of accurately controlling temperature.

Besides the asynchronous defrosting process, the heat pump system provided by the invention can realize normal refrigerating and heating processes.

Wherein, to achieve a normal refrigeration process, referring to fig. 3-5, in some embodiments, the switching device 300 is further configured to: when the heat pump system is in the cooling mode, the indoor heat exchanger 9 is controlled to be in the evaporator mode, and the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 are in the condenser mode, or one of the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 is in the evaporator mode, and the other is in the condenser mode. Thus, when cooling is required, the switching device 300 is controlled to operate so that the indoor heat exchanger 9 is in the evaporator mode and the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 are in the condenser mode, or so that one of the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 is in the evaporator mode with the indoor heat exchanger 9 and the other of the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 is in the condenser mode, thereby realizing the cooling mode. The cooling mode when the indoor heat exchanger 9 is in the evaporator mode and the first and second outdoor heat exchangers 20 and 21 are in the condenser mode may be referred to as a first cooling mode. The cooling mode when the indoor heat exchanger 9 and the first outdoor heat exchanger 20 are both in the evaporator mode and the second outdoor heat exchanger 21 is in the condenser mode may be referred to as a second cooling mode. The cooling mode when the indoor heat exchanger 9 and the second outdoor heat exchanger 21 are both in the evaporator mode and the first outdoor heat exchanger 20 is in the condenser mode may be referred to as a first cooling mode. In some embodiments, the cooling modes include a first cooling mode, a second cooling mode, and a third cooling mode. During the cooling process, as the outdoor temperature decreases, the heat pump system sequentially operates in a first cooling mode and a second cooling mode (or a third cooling mode).

While in order to achieve a normal heating process, referring to fig. 6-8, in some embodiments, the switching device 300 is configured to: when the heat pump system is in the heating mode, the indoor heat exchanger 9 is controlled to be in the condenser mode, and the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 are in the evaporator mode, or one of the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 is in the evaporator mode, and the other is in the condenser mode. In this way, when heating is required, the switching device 300 is controlled to operate so that the indoor heat exchanger 9 is in the condenser mode and the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 are in the evaporator mode, or so that one of the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 is in the condenser mode with the indoor heat exchanger 9 and the other of the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 is in the evaporator mode, thereby realizing the heating mode. The heating mode in which the indoor heat exchanger 9 is in the condenser mode and the first and second outdoor heat exchangers 20 and 21 are in the evaporator mode may be referred to as a first heating mode. The heating mode when the indoor heat exchanger 9 and the first outdoor heat exchanger 20 are both in the condenser mode and the second outdoor heat exchanger 21 is in the evaporator mode may be referred to as a second heating mode. The heating mode when the indoor heat exchanger 9 and the second outdoor heat exchanger 21 are both in the condenser mode and the first outdoor heat exchanger 20 is in the evaporator mode may be referred to as a third heating mode. In some embodiments, the heating modes include a first heating mode, a second heating mode, and a third heating mode. In the heating process, the heat pump system sequentially operates in a second heating mode (or a third heating mode), a first heating mode and a defrosting mode as the outdoor temperature is reduced. When defrosting is needed, the heat pump system is switched to a defrosting mode from the first heating mode. The indoor heat exchanger 9 is always in condenser mode during the whole heating process.

The heat pump system is arranged to be capable of realizing a refrigerating mode and a heating mode, and also capable of realizing a first defrosting mode and a second defrosting mode, so that the operation modes are more various, and the functions are more abundant.

As an implementation of the switching device 300 in the previous embodiments, referring to fig. 2-14, in some embodiments the switching device 300 comprises a first switching valve 2 and a second switching valve 3.

The first switching valve 2 includes a first valve port 2D, a second valve port 2C, a third valve port 2E, and a fourth valve port 2S. The first valve port 2D communicates with the exhaust port 11. The second valve port 2C communicates with the first port 21 a. The third valve port 2E is connected to the first port 9a through a third pipe 83. The fourth valve port 2S communicates with the intake port 10. When the first valve port 2D communicates with one of the second valve port 2C and the third valve port 2E, the fourth valve port 2S communicates with the other of the second valve port 2C and the third valve port 2E, in other words, the first switching valve 2 has a first state in which the first valve port 2D communicates with the second valve port 2C and the fourth valve port 2S communicates with the third valve port 2E, and a second state in which the first valve port 2D communicates with the third valve port 2E and the fourth valve port 2S communicates with the second valve port 2C. In this way, the first switching valve 2 is switched between the first state and the second state, that is, the on-off relationship between the first port 21a and the first port 9a and the exhaust port 11 and the intake port 10 is controlled, and the second outdoor heat exchanger 21 and the indoor heat exchanger 9 are controlled to be switched between the evaporator mode and the condenser mode.

In some embodiments, referring to fig. 2-10, the first switching valve 2 is a four-way valve, and the first switching valve 2 may also be referred to as a first four-way valve. When the four-way valve structure is adopted by the first switching valve 2, the structure is simpler, and the control is more convenient. However, the implementation of the first switching valve 2 is not limited to this, and in other embodiments, the first switching valve 2 may also include several valves (e.g., solenoid valves) connected in series and/or parallel, and the valves may be combined to cooperate to implement the function of the first switching valve 2.

In addition, the switching of the first switching valve 2 between the first state and the second state may be controlled by controlling whether the first switching valve 2 is powered. For example, in some embodiments, the first switching valve 2 is in the first state when power is lost; when the first switching valve 2 is powered on, it is in the second state.

The second switching valve 3 includes a first switching port 3D, a second switching port 3C, a third switching port 3E, and a fourth switching port 3S. The first switching port 3D communicates with the exhaust port 11. The second switching port 3C communicates with the first interface 20 a. The third switching port 3E is connected to the first port 9a through a fourth pipe 84. The fourth switching port 3S communicates with the suction port 10. When the first switching port 3D communicates with one of the second switching port 3C and the third switching port 3E, the fourth switching port 3S communicates with the other of the second switching port 3C and the third switching port 3E, in other words, the second switching valve 3 has a first operation state in which the first switching port 3D communicates with the second switching port 3C and the fourth switching port 3S communicates with the third switching port 3E, and a second operation state in which the first switching port 3D communicates with the third switching port 3E and the fourth switching port 3S communicates with the second switching port 3C. In this way, the second switching valve 3 is switched between the first operating state and the second operating state, that is, the on-off relationship between the first port 20a and the first port 9a and the exhaust port 11 and the intake port 10 can be controlled, and further, the first outdoor heat exchanger 20 and the indoor heat exchanger 9 can be controlled to be switched between the evaporator mode and the condenser mode.

In some embodiments, referring to fig. 2-14, the second switching valve 3 is a four-way valve, and the second switching valve 3 may also be referred to as a second four-way valve. When the second switching valve 3 adopts a four-way valve structure, the structure is simpler, and the control is more convenient. However, the implementation of the second switching valve 3 is not limited thereto, and for example, in other embodiments, the second switching valve 3 may also include several valves (e.g., solenoid valves) connected in series and/or parallel, and the valves may be combined to implement the function of the second switching valve 3.

In addition, the switching of the second switching valve 3 between the first operating state and the second operating state may be controlled by controlling whether the second switching valve 3 is powered. For example, in some embodiments, the second switching valve 3 is in the first operating state when power is lost; when the second switching valve 3 is powered on, it is in the second operating state.

Based on the first switching valve 2 and the second switching valve 3 provided, it is possible to conveniently and efficiently control the communication relationship between the first port 9a, the first port 20a, and the first port 21a, and the exhaust port 11 and the intake port 10, so as to control the switching of the indoor heat exchanger 9, the first outdoor heat exchanger 20, and the second outdoor heat exchanger 21 between the evaporator mode and the condenser mode.

Wherein, referring to fig. 3, when the heat pump system is in the first cooling mode, the first switching valve 2 is in the first state, the second switching valve 3 is in the first operating state, the switching device 300 controls the first port 20a and the first port 21a to communicate with the exhaust port 11, and the first port 9a to communicate with the air suction port 10, so that the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 are both in the condenser mode, and the indoor heat exchanger 9 is in the evaporator mode.

Referring to fig. 4, when the heat pump system is in the second cooling mode, the first switching valve 2 is in the first state, the second switching valve 3 is in the second operating state, and the switching device 300 controls the first port 21a to communicate with the exhaust port 11, and the first port 9a and the first port 20a are both in communication with the suction port 10, so that the second outdoor heat exchanger 21 is in the condenser mode, and the indoor heat exchanger 9 and the first outdoor heat exchanger 20 are both in the evaporator mode.

Referring to fig. 5, when the heat pump system is in the third cooling mode, the first switching valve 2 is in the second state, the third switching valve 3 is in the first operating state, and the switching device 300 controls the first port 21a to communicate with the exhaust port 11, and the first port 9a and the first port 21a are both in communication with the suction port 10, so that the first outdoor heat exchanger 20 is in the condenser mode, and the indoor heat exchanger 9 and the second outdoor heat exchanger 21 are both in the evaporator mode.

Referring to fig. 6, when the heat pump system is in the first heating mode, the first switching valve 2 is in the second state, the second switching valve 3 is in the first operating state, and the switching device 300 controls the first port 9a to communicate with the exhaust port 11, the first port 20a and the first port 21a to communicate with the suction port 10, so that the indoor heat exchanger 9 is in the condenser mode, and the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 are both in the evaporator mode.

Referring to fig. 7, when the heat pump system is in the second heating mode, the first switching valve 2 is in the second state, the third switching valve 3 is in the first operating state, the switching device 300 controls the first port 9a and the first port 20a to communicate with the exhaust port 11, and the first port 21a to communicate with the suction port 10, so that the second outdoor heat exchanger 21 is in the evaporator mode, and the indoor heat exchanger 9 and the first outdoor heat exchanger 20 are in the condenser mode.

Referring to fig. 8, when the heat pump system is in the third heating mode, the first switching valve 2 is in the first state, the second switching valve 3 is in the second operating state, and the switching device 300 controls both the first port 9a and the first port 21a to communicate with the exhaust port 11, and the first port 21a to communicate with the suction port 10, so that the first outdoor heat exchanger 20 is in the evaporator mode, and both the indoor heat exchanger 9 and the second outdoor heat exchanger 21 are in the condenser mode.

Referring to fig. 9, when the heat pump system is in the first defrosting mode, the first switching valve 2 is in the first state, the second switching valve 3 is in the second operating state, both the first port 9a and the first port 21a are controlled to communicate with the exhaust port 11, and the first port 20a communicates with the suction port 10 such that both the indoor heat exchanger 9 and the second outdoor heat exchanger 21 are in the condenser mode, and the first outdoor heat exchanger 20 is in the evaporator mode.

Referring to fig. 10, when the heat pump system is in the second defrosting mode, the first switching valve 2 is in the second state, the second switching valve 3 is in the first operating state, both the first port 9a and the first port 20a are controlled to communicate with the exhaust port 11, and the first port 21a communicates with the suction port 10 such that both the indoor heat exchanger 9 and the first outdoor heat exchanger 20 are in the condenser mode, and the second outdoor heat exchanger 21 is in the evaporator mode.

With continued reference to fig. 9 and 10, in order to prevent high-low pressure direct communication from being caused between the third pipe 83 and the fourth pipe 84 when the first switching valve 2 and the second switching valve 3 are in the opposite state, which would affect the implementation of the system function and the safety of the system operation, in some embodiments, the third valve port 2E and the first port 9a, and the third switching port 3E and the first port 9a are all provided to be connected in an on-off manner, so that the problem caused by the direct communication of high-low pressure is avoided by controlling one of the third pipe 83 and the fourth pipe 84 to be communicated and the other to be disconnected when the first switching valve 2 and the second switching valve 3 are in the opposite state.

For example, referring to fig. 9, in the first defrosting mode, the third valve opening 2E is in an off state with the first opening 9a, and the third switching opening 3E is in a communication state with the first opening 9a, so as to prevent the high pressure refrigerant flowing out of the exhaust port 11 and flowing through the fourth pipe 84 from directly flowing back to the suction port 10 via the third pipe 83, thereby causing direct conduction of the high and low pressures.

For another example, referring to fig. 10, in the second defrosting mode, the third valve opening 2E is in a communication state with the first opening 9a, and the third switching opening 3E is in a disconnection state with the first opening 9a, so as to prevent the high-pressure refrigerant flowing out of the exhaust port 11 and flowing through the third pipe 83 from directly flowing back to the suction port 10 via the fourth pipe 84, thereby causing direct conduction of the high-low pressure.

In order to achieve an on-off connection between the third valve port 2E and the first port 9a and between the third switching port 3E and the first port 9a, however, referring to fig. 2-14, in some embodiments the switching device 300 comprises not only the aforementioned first switching valve 2 and second switching valve 3, but also the first valve 4 and second valve 5. The first valve 4 is disposed on the third pipeline 83, and is used for controlling the on-off of the third pipeline 83 so as to realize the on-off connection between the third valve port 2E and the first port 9 a. The second valve 5 is disposed on the fourth pipeline 84, and is used for controlling the on-off of the fourth pipeline 84, so as to realize the on-off connection between the third switching port 3E and the first port 9 a.

The first valve 4 and the second valve 5 may be solenoid valves or electric ball valves, and at this time, the third pipeline 83 (i.e., between the third valve port 2E and the first port 9 a) and the fourth pipeline 84 (i.e., between the third switching port 3E and the first port 9 a) may be conveniently and efficiently controlled by controlling whether the first valve 4 and the second valve 5 are powered. For example, in some embodiments, when the first valve 4 and the second valve 5 are powered, the third line 83 and the fourth line 84 are controlled to communicate, respectively; when the first valve 4 and the second valve 5 are deenergized, the third pipe 83 and the fourth pipe 84 are controlled to be disconnected, respectively.

When the switching device 300 includes the first switching valve 2, the second switching valve 3, the first valve 4, and the second valve 5, the controlling the switching device 300 includes controlling the first switching valve 2, the second switching valve 3, the first valve 4, and the second valve 5. For example, in some embodiments, the correspondence between the states of the components of the first switching valve 2, the second switching valve 3, the first valve 4, the second valve 5, and the like and the respective operation modes of the heat pump system is shown in the following table 1.

Table 1 correspondence table between each component state and each operation mode of heat pump system

In some embodiments, the adjustment strategy for each component is set for different modes of operation. When the heat pump system operates in different operation modes, corresponding adjustment processing is carried out on each component according to an adjustment strategy. For example, referring to the adjustment modes in brackets in table 1 above, in some embodiments, in the first cooling/dehumidifying mode, the first heating mode, the first defrosting mode, and the second defrosting mode, the output adjustment is performed on the compressor 1, the rotation number (rotation number per unit time) adjustment is performed on the indoor fan 7, and the opening adjustment is performed on the indoor throttle 13, the first outdoor throttle 22, and the second outdoor throttle 23; in the first cooling/dehumidifying mode and the first heating mode, the first and second outdoor fans 24 and 25 are revolution-adjusted; in the first defrosting mode, the second outdoor fan 25 is turned off, and the first outdoor fan 24 is subjected to revolution adjustment; in the second defrosting mode, the first outdoor fan 24 is turned off, and the second outdoor fan 25 is turned on.

Fig. 3-10 show the refrigerant flow paths of the heat pump system in the first cooling mode, the second cooling mode, the third cooling mode, the first heating mode, the second heating mode, the third heating mode, the first defrosting mode and the second defrosting mode, respectively, based on the cooperation of the first switching valve 2, the second switching valve 3, the first valve 4 and the second valve 5.

Referring to fig. 3, when the target operation mode is the first cooling mode, the first valve port 2D of the first switching valve 2 is controlled to communicate with the second valve port 2C, the third valve port 2E is controlled to communicate with the fourth valve port 2S, the first switching port 3D of the second switching valve 3 is controlled to communicate with the second switching port 3C, the third switching port 3E is controlled to communicate with the fourth switching port 3S, and both the first valve 4 and the second valve 5 are controlled to be opened, so that the indoor heat exchanger 9 is in the evaporator mode, and the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 are in the condenser mode. At this time, the refrigerant flowing out of the compressor 1 is split into two paths, one path flows to the first outdoor heat exchanger 20 through the first switching port 3D and the second switching port 3C of the second switching valve 3, condenses and releases heat at the first outdoor heat exchanger 20, the other path flows to the second outdoor heat exchanger 21 through the first valve port 2D and the second valve port 2C of the first switching valve 2, condenses and releases heat at the second outdoor heat exchanger 21, and the two paths of refrigerant flowing out of the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 are merged at the connection point F, flow together to the indoor heat exchanger 9, evaporate and release heat at the indoor heat exchanger 9 to cool indoor air, then flow out of the indoor heat exchanger 9, split into two paths, one path flows to the third valve port 2E and the fourth valve port 2S of the first valve 4 and the first switching valve 2, the other path flows to the third switching port 3E and the fourth switching port 3S of the second valve 5 and the second switching valve 3, finally, flows to the air suction port 10, and finally flows back to the compressor 1, and the whole refrigeration cycle is completed.

Referring to fig. 4, when the target operation mode is the second cooling mode, the first valve port 2D of the first switching valve 2 is controlled to communicate with the second valve port 2C, the third valve port 2 is controlled to communicate with the fourth valve port 2S, and the first switching port 3D of the second switching valve 3 is controlled to communicate with the third switching port 3E, the second switching port 3C is controlled to communicate with the fourth switching port 3S, and the first valve 4 is controlled to be opened, the second valve 5 is closed, the indoor heat exchanger 9 and the first outdoor heat exchanger 20 are placed in the evaporator mode, and the second outdoor heat exchanger 21 is placed in the condenser mode. At this time, the refrigerant flowing out of the compressor 1 flows to the first outdoor heat exchanger 21 through the first valve port 2D and the second valve port 2C of the first switching valve 2, flows out of the second outdoor heat exchanger 21 after condensing and releasing heat through the second outdoor heat exchanger 21, is split into two paths at the connection point F, one path flows through the indoor heat exchanger 9 to absorb heat by evaporation, flows back to the compressor 1 through the first valve 4 and the third valve port 2E and the fourth valve port 2S of the first switching valve 2, and the other path flows back to the compressor 1 through the first outdoor heat exchanger 20 to absorb heat by evaporation, and flows back to the compressor 1 through the third switching port 3C and the fourth switching port 3S of the second switching valve 3. In this process, the indoor heat exchanger 9 bears the evaporation load together with the first outdoor heat exchanger 20.

Referring to fig. 5, when the target operation mode is the third cooling mode, the first valve port 2D of the first switching valve 2 is controlled to communicate with the third valve port 2E, the second valve port 2C is controlled to communicate with the fourth valve port 2S, and the first switching port 3D of the second switching valve 3 is controlled to communicate with the second switching port 3C, the third switching port 3E is controlled to communicate with the fourth switching port 3S, and the first valve 4 is controlled to be closed, the second valve 5 is opened, the indoor heat exchanger 9 and the second outdoor heat exchanger 21 are placed in the evaporator mode, and the first outdoor heat exchanger 20 is placed in the condenser mode. At this time, the refrigerant flowing out of the compressor 1 flows to the first outdoor heat exchanger 20 through the first switching port 3D and the second switching port 3C of the second switching valve 3, flows out of the first outdoor heat exchanger 20 after condensing and releasing heat through the first outdoor heat exchanger 20, is split into two paths at the connection point F, one path flows through the indoor heat exchanger 9 to absorb heat by evaporation, flows back to the compressor 1 through the second valve 5 and the third switching port 3E and the fourth switching port 3S of the second switching valve 3, and the other path flows back to the compressor 1 through the second outdoor heat exchanger 21 to absorb heat by evaporation, and flows back to the compressor 1 through the second valve port 2C and the fourth valve port 2S of the first switching valve 2. In this process, the indoor heat exchanger 9 bears the evaporation load together with the second outdoor heat exchanger 21.

Referring to fig. 6, when the target operation mode is the heating mode, the first valve port 2D of the first switching valve 2 is controlled to communicate with the third valve port 2E, the second valve port 2C is controlled to communicate with the fourth valve port 2S, and the first switching port 3D of the second switching valve 3 is controlled to communicate with the third switching port 3E, the second switching port 3C is controlled to communicate with the fourth switching port 3S, and both the first valve 4 and the second valve 5 are controlled to be opened, so that the indoor heat exchanger 9 is in the condenser mode, and the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 are in the evaporator mode. At this time, the refrigerant flowing out of the compressor 1 is split into two paths, one path flows to the first valve 4 through the first valve port 2D and the third valve port 2E of the first switching valve 2, the other path flows to the second valve 5 through the first switching port 3D and the third switching port 3E of the second switching valve 3, and the two paths of refrigerants flowing out of the first valve 4 and the second valve 5 are merged together to flow to the indoor heat exchanger 9, condense and release heat at the indoor heat exchanger 9 to raise the temperature of indoor air, then flows out of the indoor heat exchanger 9 and split into two paths at the connection point F, flows to the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 respectively, flows to the second switching valve port 3C and the fourth switching port 3S of the second switching valve 3 respectively after evaporating and absorbing heat at the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21, and the second valve port 2C and the fourth valve port 2S of the first switching valve 2 are merged together and finally flows back to the compressor 1, and the whole cycle of the valve port is completed.

Referring to fig. 7, when the target operation mode is the second heating mode, the first valve port 2D of the first switching valve 2 is controlled to communicate with the third valve port 2E, the second valve port 2C is controlled to communicate with the fourth valve port 2S, and the first switching port 3D of the second switching valve 3 is controlled to communicate with the second switching port 3C, the third switching port 3E is controlled to communicate with the fourth switching port 3S, and the first valve 4 is controlled to be opened, the second valve 5 is closed, so that both the indoor heat exchanger 9 and the first outdoor heat exchanger 20 are in the condenser mode, and the second outdoor heat exchanger 21 is in the evaporator mode. At this time, the refrigerant flowing out of the compressor 1 is split into two paths, one path flows to the indoor heat exchanger 9 through the first valve port 2D and the third valve port 2E of the first switching valve 2 and the first valve 4, condenses and releases heat at the indoor heat exchanger 9, outputs the heating amount, and the other path flows to the first outdoor heat exchanger 20 through the first switching port 3D and the second switching port 3C of the second switching valve 3, condenses and releases heat at the first outdoor heat exchanger 20, after which the two paths of refrigerant flowing out of the indoor heat exchanger 9 and the first outdoor heat exchanger 20 are merged at the connection point F, flow to the second outdoor heat exchanger 21 together, and flow to the suction port 10 through the second valve port 2C and the fourth valve port 2S of the first switching valve 2 after evaporating and absorbing heat through the second outdoor heat exchanger 21, and flow back to the compressor 1. In this process, the indoor heat exchanger 9 bears the condensing load together with the first outdoor heat exchanger 20.

Referring to fig. 8, when the target operation mode is the third heating mode, the first valve port 2D of the first switching valve 2 is controlled to communicate with the second valve port 2C, the third valve port 2E is controlled to communicate with the fourth valve port 2S, and the first switching port 3D of the second switching valve 3 is controlled to communicate with the third switching port 3E, the second switching port 3C is controlled to communicate with the fourth switching port 3S, and the first valve 4 is controlled to be closed, the second valve 5 is opened, so that both the indoor heat exchanger 9 and the second outdoor heat exchanger 21 are in the condenser mode, and the first outdoor heat exchanger 20 is in the evaporator mode. At this time, one path flows to the indoor heat exchanger 9 through the first switching port 3D and the third switching port 3E of the second switching valve 3 and the second valve 5, condenses and releases heat at the indoor heat exchanger 9, outputs the amount of heat generation, and the other path flows to the second outdoor heat exchanger 21 through the first valve port 2D and the second valve port 2C of the first switching valve 2, condenses and releases heat at the second outdoor heat exchanger 21, after which the two paths of refrigerant flowing out from the indoor heat exchanger 9 and the second outdoor heat exchanger 21 are merged at the connection point F, flow to the first outdoor heat exchanger 20 together, and flow to the suction port 10 through the second switching port 3C and the fourth switching port 3S of the second switching valve 3 after evaporating and absorbing heat through the first outdoor heat exchanger 20, and flow back to the compressor 1. In this process, the indoor heat exchanger 9 bears the condensing load together with the second outdoor heat exchanger 21.

Referring to fig. 9, when the target operation mode is the first defrosting mode, the first valve port 2D of the first switching valve 2 is controlled to communicate with the second valve port 2C, the third valve port 2E is controlled to communicate with the fourth valve port 2S, and the first switching port 3D of the second switching valve 3 is controlled to communicate with the third switching port 3E, the second switching port 3C is controlled to communicate with the fourth switching port 3S, and the first valve 4 is controlled to be closed, the second valve 5 is opened, so that both the second outdoor heat exchanger 21 and the indoor heat exchanger 9 are in the condenser mode, and the first outdoor heat exchanger 20 is in the evaporator mode. At this time, the refrigerant flowing out of the compressor 1 is split into two paths, one path flows to the indoor heat exchanger 9 through the first switching port 3D and the third switching port 3E of the second switching valve 3 and the second valve 5, condenses and releases heat at the indoor heat exchanger 9, the other path flows to the second outdoor heat exchanger 21 through the first valve port 2D and the second valve port 2C of the first switching valve 2, condenses and releases heat at the second outdoor heat exchanger 21, and is defrosted, and then the two paths of refrigerant flowing out of the indoor heat exchanger 9 and the second outdoor heat exchanger 21 are merged at the connection point F, flow to the first outdoor heat exchanger 20 together, flow to the air inlet 10 through the second switching port 3C and the fourth switching port 3S of the second switching valve 3 after evaporating and absorbing heat through the first outdoor heat exchanger 20, and flow back to the compressor 1.

Referring to fig. 10, when the target operation mode is the second defrosting mode, the first valve port 2D of the first switching valve 2 is controlled to communicate with the third valve port 2E, the second valve port 2C is controlled to communicate with the fourth valve port 2S, and the first switching port 3D of the second switching valve 3 is controlled to communicate with the second switching port 3C, the third switching port 3E is controlled to communicate with the fourth switching port 3S, and the first valve 4 is controlled to be opened, the second valve 5 is closed, so that both the first outdoor heat exchanger 20 and the indoor heat exchanger 9 are in the condenser mode, and the second outdoor heat exchanger 21 is in the evaporator mode. At this time, the refrigerant flowing out of the compressor 1 is split into two paths, one path flows to the indoor heat exchanger 9 through the first valve port 2D and the third valve port 2E of the first switching valve 2 and the first valve 4, condenses and releases heat at the indoor heat exchanger 9, outputs the heating amount, and the other path flows to the first outdoor heat exchanger 20 through the first switching port 3D and the second switching port 3C of the second switching valve 3, condenses and releases heat at the first outdoor heat exchanger 20, and is defrosted, and then the two paths of refrigerant flowing out of the indoor heat exchanger 9 and the first outdoor heat exchanger 20 are merged at the connection point F, flow to the second outdoor heat exchanger 21 together, and flow to the air suction port 10 through the second valve port 2C and the fourth valve port 2S of the first switching valve 2 after evaporating and absorbing heat through the second outdoor heat exchanger 21, and flow back to the compressor 1.

It can be seen that the first switching valve 2, the second switching valve 3, the first valve 4 and the second valve 5 are matched, so that the working modes of the indoor heat exchanger 9, the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 can be conveniently switched, the requirements of refrigeration, heating and defrosting processes are met, an asynchronous defrosting process is realized, the indoor heat exchanger 9 can be kept in a condenser mode in the defrosting process, the heating and temperature control imbalance problem caused by switching the indoor heat exchanger 9 to an evaporator mode in the defrosting process is reduced, and a more accurate and energy-saving temperature regulation process is realized.

To further reduce the negative impact of the defrosting process on the heat pump system, referring to fig. 1-14, in some embodiments, the heat pump system further includes an inter-tube heat exchanger 12 located indoors or outdoors. The inter-tube heat exchanger 12 is provided with a first flow passage 121 and a second flow passage 122 which can exchange heat with each other. And, referring to fig. 1-8, in some embodiments, the first interface 20a and the first port 21a are coupled to the switching device 300 via the first flow path 121 and the second flow path 122, respectively. Or referring to fig. 9-10, in other embodiments, the second port 20b and the second port 21b are connected to the indoor heat exchanger 9 through a first flow passage 121 and a second flow passage 122, respectively. The interface of the first flow channel 121 and the switching device 300 or the indoor heat exchanger 9 may be referred to as a first working port q, the interface of the first flow channel 121 and the first outdoor heat exchanger 20 may be referred to as a second working port m, the interface of the second flow channel 122 and the switching device 300 or the indoor heat exchanger 9 may be referred to as a third working port p, and the interface of the first flow channel 121 and the second outdoor heat exchanger 21 may be referred to as a fourth working port n.

For example, referring to fig. 1-10 and 12, in some embodiments, the inter-tube heat exchanger 12 is disposed outdoors and connected between the first and second outdoor heat exchangers 20, 21 and the switching device 300. At this time, the first interface 20a and the first port 21a are connected to the switching device 300 through the first flow path 121 and the second flow path 122, respectively. The first working port q is connected to the switching device 300, specifically to the second switching port 3C of the second switching valve 3. The second working port m is connected to the first interface 20 a. The third working port p is connected to the switching device 300, specifically to the second port 2C of the first switching valve 2. The fourth working port n is connected to the first port 21 a. The difference between the embodiments of fig. 1-6 and fig. 8 is mainly that in the embodiment of fig. 1-6 the compressor 1 is located indoors, whereas in the embodiment of fig. 8 the compressor 1 is located outdoors.

For another example, referring to fig. 11, in some embodiments, the inter-tube heat exchanger 12 is still connected between the first and second outdoor heat exchangers 20 and 21 and the switching device 300, and the connection relationship is the same as that of the embodiments shown in fig. 1-6 and 8, but the inter-tube heat exchanger 12 is not disposed outdoors but disposed indoors. Also, as shown in fig. 11, in this embodiment, the compressor 1 is also located indoors.

For another example, referring to fig. 13 and 14, in some embodiments, the inter-tube heat exchanger 12 is not connected between the first and second outdoor heat exchangers 20 and 21 and the switching device 300, but is connected between the first and second outdoor heat exchangers 20 and 21 and the indoor heat exchanger 9, although still disposed outdoors. At this time, the second port 20b and the second port 21b are connected to the indoor heat exchanger 9 through the first flow passage 121 and the second flow passage 122, respectively. Specifically, the first flow passage 121 is located between the first outdoor throttle 22 and the second port 20b of the heat pump system. The second flow passage 122 is located between the second outdoor throttle 23 and the second port 21b of the heat pump system. The first working port q is connected to the second port 9b of the indoor heat exchanger 9 through the first outdoor throttle 22. The second working port m is connected to the second interface 20 b. The third working port p is connected to the connection point F through the third throttle 23, thereby achieving connection to the second port 9b of the indoor heat exchanger 9. The fourth working port n is connected to the second port 21 b. The difference between the embodiments shown in fig. 13 and 14 is mainly that in the embodiment shown in fig. 13, the compressor 1 is located outdoors, whereas in the embodiment shown in fig. 14, the compressor 1 is located indoors.

Based on the above arrangement, referring to fig. 9 and 10, in the defrosting mode, the inter-tube heat exchanger 12 can evaporate the refrigerant together with the outdoor heat exchanger serving as the evaporator before the refrigerant flows back to the compressor 1, and the evaporation of the refrigerant flowing back to the compressor 1 is increased on the basis of the outdoor heat exchanger serving as the evaporator, so that the reduction, even the defrosting liquid return, of the refrigerant is avoided, the effect of quickly recovering the output of the replication heat after the defrosting is important, the negative influence of the defrosting on the heat pump system can be effectively reduced, and the temperature control accuracy and the operation safety of the heat pump system are improved.

For example, in the embodiment in which the heat exchanger 12 between the pipes is disposed between the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 and the switching device 300, and the first port 20a and the first port 21a are connected to the switching device 300 through the first flow channel 121 and the second flow channel 122, respectively, referring to fig. 5, when the heat pump system is in the first defrosting mode, the low-temperature low-pressure refrigerant flowing out of the first outdoor heat exchanger 20 flows through the first flow channel 121, because there is a heat exchange temperature difference between the low-temperature low-pressure refrigerant and the high-temperature high-pressure refrigerant flowing out of the exhaust port 12 and flowing through the second flow channel 122, the heat of the refrigerant in the second flow channel 122 can be absorbed, and further evaporation is performed, so that the heat exchanger 12 between the pipes can evaporate the refrigerant again after the refrigerant is evaporated by the first outdoor heat exchanger 20, and evaporate the refrigerant flowing back to the compressor 1 mostly or completely, so as to avoid or reduce defrosting liquid back, and improve the temperature control accuracy and operation safety of the heat pump system; meanwhile, referring to fig. 10, when the heat pump system is in the second defrosting mode, the low-temperature low-pressure refrigerant flowing out of the second outdoor heat exchanger 21 flows through the second flow passage 122, because of the heat exchange temperature difference between the low-temperature low-pressure refrigerant flowing out of the exhaust port 12 and flowing through the first flow passage 121, the low-temperature low-pressure refrigerant can exchange heat with the refrigerant in the first flow passage 121, absorb heat of the refrigerant in the first flow passage 121, and further evaporate, so that the inter-tube heat exchanger 12 can evaporate the refrigerant again after evaporating the refrigerant in the second outdoor heat exchanger 21, and most or all of the refrigerant flowing back to the compressor 1 is evaporated, thereby avoiding or reducing defrosting liquid return and improving the temperature control accuracy and operation safety of the heat pump system.

Similarly, in the embodiment in which the inter-tube heat exchanger 12 is disposed between the first and second outdoor heat exchangers 20 and 21 and the indoor heat exchanger 9, and the first port 20a and the first port 21a are connected to the indoor heat exchanger 9 through the first and second flow passages 121 and 122, respectively, the inter-tube heat exchanger 12 also functions to improve the defrosting back-liquid phenomenon, which is similar to the description of fig. 5 to 6 described above, the difference is mainly that in the defrosting mode, the refrigerant does not flow through the outdoor heat exchanger (for example, the first outdoor heat exchanger 20 in the first defrosting mode or the second outdoor heat exchanger 21 in the second defrosting mode) serving as an evaporator before flowing to the outdoor heat exchanger serving as an evaporator, but flows through the inter-tube heat exchanger 12, so that the refrigerant flows through one flow passage of the inter-tube heat exchanger 12 before flowing to the outdoor heat exchanger serving as an evaporator, and the refrigerant also flows through the other flow passage 12 serving as an evaporator, and the heat back-liquid phenomenon can be improved, and the evaporation can be improved.

Therefore, by adding the inter-pipe heat exchanger 12 between the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 and evaporating the low-temperature low-pressure liquid refrigerant flowing back to the compressor 1 by using the high-temperature high-pressure refrigerant flowing out of the compressor 1, the defrosting liquid return phenomenon can be effectively improved, the phenomenon that the low-temperature low-pressure refrigerant is directly returned to the compressor 1 without sufficient evaporation in the defrosting process is prevented, the full load output of heating capacity can be realized immediately after the defrosting is finished, and the temperature control precision and the operation safety of the system are improved.

Meanwhile, the added heat exchanger 12 between the pipes does not affect the first cooling mode and the first heating mode. For example, referring to fig. 3, when the heat pump system is in the cooling mode, both the refrigerant flowing through the first passage 121 and the second passage 122 of the inter-tube heat exchanger 12 are high-temperature and high-pressure vapor flowing out of the exhaust port 11, and the two refrigerant are the same in temperature, so that there is no heat exchange temperature difference between the first passage 121 and the second passage 122, and no heat exchange is performed, and therefore, the inter-tube heat exchanger 12 does not or hardly interfere with the cooling process in the first cooling mode. For another example, referring to fig. 6, when the heat pump system is in the heating mode, the two-path refrigerant flowing through the first and second paths 121 and 122 of the inter-pipe heat exchanger 12 are low-temperature and low-pressure refrigerant flowing to the compressor 1 after being evaporated by the outdoor heat exchanger, and the two-path refrigerant have the same temperature, so that there is no heat exchange temperature difference between the first and second paths 121 and 122, and no heat exchange is performed, and therefore, the inter-pipe heat exchanger 12 does not or rarely interfere with the heating process in the first heating mode.

In addition, the added heat exchanger 12 between the pipes is beneficial to improving the energy-saving effect. Specifically, since the inter-tube heat exchanger 12 can share the evaporation load, the power of the outdoor fan corresponding to the outdoor heat exchanger serving as the evaporator (i.e., the first outdoor fan 24 in the first defrosting mode or the second outdoor fan 25 in the second defrosting mode) can be reduced, and even referring to the above table 1, in some embodiments, the power of the outdoor fan corresponding to the outdoor heat exchanger serving as the evaporator can be reduced to 0, and the outdoor fan corresponding to the outdoor heat exchanger serving as the evaporator can be turned off, so that the energy consumption consumed by the outdoor fan can be effectively reduced, and the energy saving effect can be improved.

Referring to fig. 15, based on the heat pump system of the foregoing embodiments, the present invention also provides a control method of the heat pump system, including:

s100, determining a target operation mode of a heat pump system;

S200, the switching device 300 is controlled to operate based on the target operation mode.

The target operation mode of the heat pump system in step S100 refers to a mode required to operate the heat pump system, and may be a cooling mode, a heating mode or a defrosting mode, and the defrosting mode may include a first defrosting mode and a second defrosting mode.

In step S200, the operation of the switching device 300 is controlled based on the target operation mode, which means that the switching device 300 is controlled to operate so as to switch the heat pump system to the target operation mode. Referring to fig. 11, in some embodiments, controlling the switching device 300 action based on the target operation mode in step S200 includes at least one of:

S230, when the target operation mode is a defrosting mode, controlling the switching device 300 to act so that one of the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 and the indoor heat exchanger 9 are both in a condenser mode, and the other of the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 is in an evaporator mode;

s210, when the target operation mode is the cooling mode, controlling the switching device 300 to operate, so that the indoor heat exchanger 9 is in the evaporator mode, and the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 are in the condenser mode, or one of the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 is in the evaporator mode, and the other is in the condenser mode;

S220, when the target operation mode is the heating mode, the switching device 300 is controlled to operate so that the indoor heat exchanger 9 is in the condenser mode and the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 are in the evaporator mode, or one of the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 is in the evaporator mode and the other is in the condenser mode.

Wherein, when the cooling mode includes the first cooling mode, step S210 includes:

The switching device 300 is controlled to operate so that the indoor heat exchanger 9 is in the evaporator mode and the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 are in the condenser mode.

When the cooling mode includes the second cooling mode, step S210 includes:

The switching device 300 is controlled to operate so that the indoor heat exchanger 9 and the first outdoor heat exchanger 20 are in the evaporator mode and the second outdoor heat exchanger 21 is in the condenser mode.

When the cooling mode includes the third cooling mode, step S210 includes:

The switching device 300 is controlled to operate so that the indoor heat exchanger 9 and the second outdoor heat exchanger 21 are in the evaporator mode and the first outdoor heat exchanger 20 is in the condenser mode.

When the heating mode includes the first heating mode, step S220 includes:

The switching device 300 is controlled to operate so that the indoor heat exchanger 9 is in the condenser mode and the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 are in the evaporator mode.

When the heating mode includes the second heating mode, step S220 includes:

The switching device 300 is controlled to operate so that the indoor heat exchanger 9 and the first outdoor heat exchanger 20 are both in the condenser mode and the second outdoor heat exchanger 21 is in the evaporator mode.

When the heating mode includes the first heating mode, step S220 includes:

the switching device 300 is controlled to operate so that both the indoor heat exchanger 9 and the second outdoor heat exchanger 21 are in the condenser mode and the first outdoor heat exchanger 20 is in the evaporator mode.

When the defrosting mode includes the first defrosting mode, step S230 includes:

When the target operation mode is the first defrosting mode, the switching device 300 is controlled to operate so that the second outdoor heat exchanger 21 and the indoor heat exchanger 9 are both in the condenser mode and the first outdoor heat exchanger 20 is in the evaporator mode.

When the defrosting mode includes the second defrosting mode, step S230 includes:

when the target operation mode is the second defrosting mode, the switching device 300 is controlled to operate so that the first outdoor heat exchanger 20 and the indoor heat exchanger 9 are both in the condenser mode and the second outdoor heat exchanger 21 is in the evaporator mode.

In addition, when the switching device 300 specifically includes the first switching valve 2, the second switching valve 3, the first valve 4, and the second valve 5, the control of the operation of the switching device 300 in S200 may specifically refer to the control of the operation of the first switching valve 2, the second switching valve 3, the first valve 4, and the second valve 5.

For example, when the target operation mode is the first defrosting mode, the first valve port 2D and the second valve port 2C of the first switching valve 2 are controlled to communicate, the third valve port 2E and the fourth valve port 2S are controlled to communicate, the first switching port 3D and the third switching port 3E of the second switching valve 3 are controlled to communicate, the second switching port 3C and the fourth switching port 3S are controlled to close, the second valve 5 is opened, the second outdoor heat exchanger 21 and the indoor heat exchanger 9 are both in the condenser mode, and the first outdoor heat exchanger 20 is in the evaporator mode.

When the target operation mode is the second defrosting mode, the first valve port 2D of the first switching valve 2 is controlled to be communicated with the third valve port 2E, the second valve port 2C is controlled to be communicated with the fourth valve port 2S, the first switching port 3D of the second switching valve 3 is controlled to be communicated with the second switching port 3C, the third switching port 3E is controlled to be communicated with the fourth switching port 3S, the first valve 4 is controlled to be opened, the second valve 5 is closed, the first outdoor heat exchanger 20 and the indoor heat exchanger 9 are both in the condenser mode, and the second outdoor heat exchanger 21 is in the evaporator mode.

For another example, when the target operation mode is the first cooling mode, the first valve port 2D and the second valve port 2C of the first switching valve 2 are controlled to communicate, the third valve port 2E and the fourth valve port 2S are controlled to communicate, the first switching port 3D and the second switching port 3C of the second switching valve 3 are controlled to communicate, the third switching port 3E and the fourth switching port 3S are controlled to open, the first valve 4 and the second valve 5 are both controlled to open, the indoor heat exchanger 9 is in the evaporator mode, and the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 are in the condenser mode.

When the target operation mode is the second refrigeration mode, the first valve port 2D of the first switching valve 2 is controlled to be communicated with the second valve port 2C, the third valve port 2 is controlled to be communicated with the fourth valve port 2S, the first switching port 3D of the second switching valve 3 is controlled to be communicated with the third switching port 3E, the second switching port 3C is controlled to be communicated with the fourth switching port 3S, the first valve 4 is controlled to be opened, the second valve 5 is closed, the indoor heat exchanger 9 and the first outdoor heat exchanger 20 are caused to be in the evaporator mode, and the second outdoor heat exchanger 21 is caused to be in the condenser mode.

When the target operation mode is the third cooling mode, the first valve port 2D of the first switching valve 2 is controlled to be communicated with the third valve port 2E, the second valve port 2C is controlled to be communicated with the fourth valve port 2S, the first switching port 3D of the second switching valve 3 is controlled to be communicated with the second switching port 3C, the third switching port 3E is controlled to be communicated with the fourth switching port 3S, the first valve 4 is controlled to be closed, the second valve 5 is opened, the indoor heat exchanger 9 and the second outdoor heat exchanger 21 are placed in the evaporator mode, and the first outdoor heat exchanger 20 is placed in the condenser mode.

For another example, when the target operation mode is the first heating mode, the first valve port 2D of the first switching valve 2 is controlled to communicate with the third valve port 2E, the second valve port 2C is controlled to communicate with the fourth valve port 2S, the first switching port 3D of the second switching valve 3 is controlled to communicate with the second switching port 3C, the third switching port 3E is controlled to communicate with the fourth switching port 3S, and both the first valve 4 and the second valve 5 are controlled to be opened, so that the indoor heat exchanger 9 is in the condenser mode, and the first outdoor heat exchanger 20 and the second outdoor heat exchanger 21 are in the evaporator mode. This step is denoted S221 in fig. 11.

When the target operation mode is the second heating mode, the first valve port 2D of the first switching valve 2 is controlled to be communicated with the third valve port 2E, the second valve port 2C is controlled to be communicated with the fourth valve port 2S, the first switching port 3D of the second switching valve 3 is controlled to be communicated with the second switching port 3C, the third switching port 3E is controlled to be communicated with the fourth switching port 3S, the first valve 4 is controlled to be opened, the second valve 5 is closed, the indoor heat exchanger 9 and the first outdoor heat exchanger 20 are both in the condenser mode, and the second outdoor heat exchanger 21 is in the evaporator mode.

When the target operation mode is the third heating mode, the first valve port 2D of the first switching valve 2 is controlled to be communicated with the second valve port 2C, the third valve port 2E is controlled to be communicated with the fourth valve port 2S, the first switching port 3D of the second switching valve 3 is controlled to be communicated with the third switching port 3E, the second switching port 3C is controlled to be communicated with the fourth switching port 3S, the first valve 4 is controlled to be closed, the second valve 5 is opened, the indoor heat exchanger 9 and the second outdoor heat exchanger 21 are both in the condenser mode, and the first outdoor heat exchanger 20 is in the evaporator mode.

In addition, the present invention also provides a control device of a heat pump system, comprising a memory 26 and a processor 27 coupled to the memory, the processor 27 being configured to execute the control method of the foregoing embodiments based on instructions stored in the memory 26.

For example, referring to fig. 16, in some embodiments, the control device includes a memory 26, a processor 27, a communication interface 28, and a bus 29. The memory 26 is used to store instructions. The processor 27 is coupled to the memory 26 and is configured to execute control methods implementing the foregoing embodiments based on instructions stored by the memory 131. The memory 26, the processor 27, and the communication interface 28 are connected by a bus 29.

The memory 26 may be a high-speed RAM memory or a nonvolatile memory (non-volatile memory) or the like. Memory 26 may also be a memory array. The memory 26 may also be partitioned and the blocks may be combined into virtual volumes according to certain rules. Processor 27 may be a central processing unit CPU, or an Application-specific integrated Circuit ASIC (Application SPECIFIC INTEGRATED Circuit), or one or more integrated circuits configured to implement the control method of the heat pump system of the present invention.

In yet another aspect, the present invention provides an air conditioning apparatus, which includes the heat pump system of each of the foregoing embodiments and the control device of each of the foregoing embodiments.

Still another aspect of the present invention provides a computer-readable storage medium. The computer readable storage medium stores computer instructions. The computer instructions are executed by the processor to perform the control methods of the foregoing embodiments.

The foregoing description of the exemplary embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims

1. A heat pump system, comprising:

a compressor (1);

An indoor heat exchanger (9);

A first outdoor heat exchanger (20);

a second outdoor heat exchanger (21); and

A switching device (300) for controlling the switching of the indoor heat exchanger (9), the first outdoor heat exchanger (20) and the second outdoor heat exchanger (21) between an evaporator mode and a condenser mode by controlling the on-off relationship between a first port (9 a) of the indoor heat exchanger (9), a first port (20 a) of the first outdoor heat exchanger (20) and a first port (21 a) of the second outdoor heat exchanger (21) and an exhaust port (11) and an intake port (10) of the compressor (1), the switching device (300) comprising a first switching valve (2) and a second switching valve (3), the first switching valve (2) comprises a first valve port (2D), a second valve port (2C), a third valve port (2E) and a fourth valve port (2S), when the first valve port (2D) is communicated with one of the second valve port (2C) and the third valve port (2E), the fourth valve port (2S) is communicated with the other of the second valve port (2C) and the third valve port (2E), the first valve port (2D) is communicated with the exhaust port (11), the second valve port (2C) is communicated with the first port (21 a), the third valve port (2E) is connected with the first port (9 a) through a third pipeline (83), the fourth valve port (2S) is communicated with the air suction port (10), the second switching valve (3) comprises a first switching port (3D), a second switching port (3C), a third switching port (3E) and a fourth switching port (3S), when the first switching port (3D) is communicated with one of the second switching port (3C) and the third switching port (3E), the fourth switching port (3S) is communicated with the other of the second switching port (3C) and the third switching port (3E), the first switching port (3D) is communicated with the air discharge port (11), the second switching port (3C) is communicated with the first port (20 a), the third switching port (3E) is connected with the first port (9 a) through a fourth pipeline (84), and the fourth switching port (3S) is communicated with the air suction port (10);

The second port (9 b) of the indoor heat exchanger (9) is connected with the second interface (20 b) of the first outdoor heat exchanger (20) through a first pipeline (81), and the second port (21 b) of the second outdoor heat exchanger (21) is connected with the first pipeline (81) through a second pipeline (82);

-the switching device (300) is configured to control one of the first and second outdoor heat exchangers (20, 21) and the indoor heat exchanger (9) to be in the condenser mode and the other of the first and second outdoor heat exchangers (20, 21) to be in the evaporator mode when the heat pump system is in the defrosting mode;

The heat pump system further comprises an inter-pipe heat exchanger (12), a first flow passage (121) and a second flow passage (122) which can exchange heat with each other are arranged in the inter-pipe heat exchanger (12), and the first interface (20 a) and the first port (21 a) are respectively connected with the switching device (300) through the first flow passage (121) and the second flow passage (122), or the second interface (20 b) and the second port (21 b) are respectively connected with the indoor heat exchanger (9) through the first flow passage (121) and the second flow passage (122).

2. The heat pump system according to claim 1, wherein the switching device (300) further comprises:

a first valve (4) arranged on the third pipeline (83) and used for controlling the on-off of the third pipeline (83); and

And the second valve (5) is arranged on the fourth pipeline (84) and is used for controlling the on-off of the fourth pipeline (84).

3. The heat pump system according to claim 1, wherein the first pipe (81) and the second pipe (82) are connected at a connection point (F), the heat pump system further comprising:

a first outdoor throttle (22) arranged on the first pipeline (81) and located between the second interface (20 b) and the connection point (F); and

And a second outdoor throttle (23) provided on the second pipe (82).

4. The heat pump system according to claim 1, wherein the switching device (300) is further configured to at least one of:

Controlling the indoor heat exchanger (9) to be in the evaporator mode and the first outdoor heat exchanger (20) and the second outdoor heat exchanger (21) to be in the condenser mode when the heat pump system is in the cooling mode;

When the heat pump system is in a heating mode, the indoor heat exchanger (9) is controlled to be in the condenser mode, and the first outdoor heat exchanger (20) and the second outdoor heat exchanger (21) are controlled to be in the evaporator mode.

5. Heat pump system according to claim 1, characterized in that the compressor (1) is located indoors or outdoors.

6. The heat pump system according to claim 1, wherein the second interface (20 b) and the second port (21 b) are connected to the indoor heat exchanger (9) via the first flow channel (121) and the second flow channel (122), respectively, and the first flow channel (121) is located between a first outdoor restriction (22) and the second interface (20 b) of the heat pump system.

7. The heat pump system according to claim 1, wherein the inter-tube heat exchanger (12) is located indoors or outdoors.

8. The heat pump system of claim 1, further comprising a first outdoor fan (24) and a second outdoor fan (25), the first outdoor fan (24) and the first outdoor heat exchanger (20) being located in a first air duct, the second outdoor fan (25) and the second outdoor heat exchanger (21) being located in a second air duct, the first air duct being provided independently of the second air duct.

9. A control method of a heat pump system for controlling the heat pump system according to any one of claims 1 to 8, comprising:

determining a target operating mode of the heat pump system;

-controlling the switching device (300) to act based on the target operating mode.

10. The control method according to claim 9, characterized in that the control switching means (300) action based on the target operation mode comprises at least one of:

when the target operation mode is a defrosting mode, controlling the switching device (300) to act so that one of the first outdoor heat exchanger (20) and the second outdoor heat exchanger (21) and the indoor heat exchanger (9) are both in the condenser mode, and the other of the first outdoor heat exchanger (20) and the second outdoor heat exchanger (21) is in the evaporator mode;

When the target operation mode is a refrigeration mode, controlling the switching device (300) to act so that the indoor heat exchanger (9) is in the evaporator mode, and the first outdoor heat exchanger (20) and the second outdoor heat exchanger (21) are in the condenser mode, or one of the first outdoor heat exchanger (20) and the second outdoor heat exchanger (21) is in the evaporator mode, and the other is in the condenser mode;

When the target operation mode is a heating mode, the switching device (300) is controlled to operate, so that the indoor heat exchanger (9) is in the condenser mode, the first outdoor heat exchanger (20) and the second outdoor heat exchanger (21) are in the evaporator mode, or one of the first outdoor heat exchanger (20) and the second outdoor heat exchanger (21) is in the evaporator mode, and the other is in the condenser mode.

11. The control method according to claim 10, wherein when the target operation mode is a defrosting mode, controlling the switching device (300) to operate such that one of the first outdoor heat exchanger (20) and the second outdoor heat exchanger (21) and the indoor heat exchanger (9) are both in a condenser mode, and the other of the first outdoor heat exchanger (20) and the second outdoor heat exchanger (21) is in an evaporator mode includes at least one of:

When the target operation mode is a first defrosting mode, controlling the switching device (300) to act, so that the second outdoor heat exchanger (21) and the indoor heat exchanger (9) are both in the condenser mode, and the first outdoor heat exchanger (20) is in the evaporator mode;

When the target operation mode is a defrosting mode, the switching device (300) is controlled to act, so that the first outdoor heat exchanger (20) and the indoor heat exchanger (9) are both in the condenser mode, and the second outdoor heat exchanger (21) is in the evaporator mode.

12. A control method of a heat pump system for controlling the heat pump system according to any one of claims 2 to 8, comprising:

determining a target operating mode of the heat pump system;

The first switching valve (2), the second switching valve (3), the first valve (4) and the second valve (5) are controlled to operate based on the target operation mode.

13. The control method according to claim 12, characterized in that the controlling of the first switching valve (2), the second switching valve (3), the first valve (4) and the second valve (5) actions based on the target operation mode comprises at least one of:

When the target operation mode is a first defrosting mode, a first valve port (2D) of the first switching valve (2) is controlled to be communicated with a second valve port (2C), a third valve port (2E) is controlled to be communicated with a fourth valve port (2S), a first switching port (3D) of the second switching valve (3) is controlled to be communicated with a third switching port (3E), a second switching port (3C) is controlled to be communicated with a fourth switching port (3S), the first valve (4) is controlled to be closed, the second valve (5) is opened, the second outdoor heat exchanger (21) and the indoor heat exchanger (9) are both in the condenser mode, and the first outdoor heat exchanger (20) is in the evaporator mode;

when the target operation mode is a second defrosting mode, a first valve port (2D) of the first switching valve (2) is controlled to be communicated with a third valve port (2E), a second valve port (2C) is controlled to be communicated with a fourth valve port (2S), a first switching port (3D) of the second switching valve (3) is controlled to be communicated with a second switching port (3C), a third switching port (3E) is controlled to be communicated with a fourth switching port (3S), the first valve (4) is controlled to be opened, the second valve (5) is closed, the first outdoor heat exchanger (20) and the indoor heat exchanger (9) are both in the condenser mode, and the second outdoor heat exchanger (21) is in the evaporator mode;

When the target operation mode is a first refrigeration mode, a first valve port (2D) of the first switching valve (2) is controlled to be communicated with a second valve port (2C), a third valve port (2E) is controlled to be communicated with a fourth valve port (2S), a first switching port (3D) of the second switching valve (3) is controlled to be communicated with a second switching port (3C), a third switching port (3E) is controlled to be communicated with a fourth switching port (3S), and the first valve (4) and the second valve (5) are controlled to be opened, so that the indoor heat exchanger (9) is in the evaporator mode, and the first outdoor heat exchanger (20) and the second outdoor heat exchanger (21) are in the condenser mode;

when the target operation mode is a second refrigeration mode, a first valve port (2D) of the first switching valve (2) is controlled to be communicated with a second valve port (2C), a third valve port (2) is controlled to be communicated with a fourth valve port (2S), a first switching port (3D) of the second switching valve (3) is controlled to be communicated with a third switching port (3E), a second switching port (3C) is controlled to be communicated with a fourth switching port (3S), the first valve (4) is controlled to be opened, the second valve (5) is closed, the indoor heat exchanger (9) and the first outdoor heat exchanger (20) are in the evaporator mode, and the second outdoor heat exchanger (21) is in the condenser mode;

When the target operation mode is a third refrigeration mode, a first valve port (2D) of the first switching valve (2) is controlled to be communicated with a third valve port (2E), a second valve port (2C) is controlled to be communicated with a fourth valve port (2S), a first switching port (3D) of the second switching valve (3) is controlled to be communicated with a second switching port (3C), a third switching port (3E) is controlled to be communicated with a fourth switching port (3S), the first valve (4) is controlled to be closed, the second valve (5) is opened, the indoor heat exchanger (9) and the second outdoor heat exchanger (21) are in the evaporator mode, and the first outdoor heat exchanger (20) is in the condenser mode;

When the target operation mode is a first heating mode, a first valve port (2D) of the first switching valve (2) is controlled to be communicated with a third valve port (2E), a second valve port (2C) is controlled to be communicated with a fourth valve port (2S), a first switching port (3D) of the second switching valve (3) is controlled to be communicated with a second switching port (3C), a third switching port (3E) is controlled to be communicated with a fourth switching port (3S), and the first valve (4) and the second valve (5) are controlled to be opened, so that the indoor heat exchanger (9) is in the condenser mode, and the first outdoor heat exchanger (20) and the second outdoor heat exchanger (21) are in the evaporator mode;

When the target operation mode is a second heating mode, a first valve port (2D) of the first switching valve (2) is controlled to be communicated with a third valve port (2E), a second valve port (2C) is controlled to be communicated with a fourth valve port (2S), a first switching port (3D) of the second switching valve (3) is controlled to be communicated with a second switching port (3C), a third switching port (3E) is controlled to be communicated with a fourth switching port (3S), the first valve (4) is controlled to be opened, the second valve (5) is closed, the indoor heat exchanger (9) and the first outdoor heat exchanger (20) are both in the condenser mode, and the second outdoor heat exchanger (21) is in the evaporator mode;

when the target operation mode is a third heating mode, a first valve port (2D) of the first switching valve (2) is controlled to be communicated with a second valve port (2C), a third valve port (2E) is controlled to be communicated with a fourth valve port (2S), a first switching port (3D) of the second switching valve (3) is controlled to be communicated with a third switching port (3E), a second switching port (3C) is controlled to be communicated with a fourth switching port (3S), the first valve (4) is controlled to be closed, the second valve (5) is opened, the indoor heat exchanger (9) and the second outdoor heat exchanger (21) are both in the condenser mode, and the first outdoor heat exchanger (20) is in the evaporator mode.

14. A control device of a heat pump system comprising a memory (26) and a processor (27) coupled to the memory, the processor (27) being configured to execute the control method according to any of claims 9-13 based on instructions stored in the memory (26).

15. An air conditioning apparatus comprising a heat pump system according to any one of claims 1 to 8 and a control device according to claim 14.

16. A computer readable storage medium storing computer instructions for execution by a processor of a control method according to any one of claims 9-13.