CN111120689B

CN111120689B - Air conditioner and control method thereof

Info

Publication number: CN111120689B
Application number: CN201811290369.5A
Authority: CN
Inventors: 高斌
Original assignee: Guangdong Meizhi Precision Manufacturing Co Ltd
Current assignee: Guangdong Meizhi Precision Manufacturing Co Ltd
Priority date: 2018-10-31
Filing date: 2018-10-31
Publication date: 2021-12-03
Anticipated expiration: 2038-10-31
Also published as: WO2020087903A1; CN111120689A

Abstract

The invention discloses an air conditioner and a control method thereof, wherein the air conditioner comprises: a compressor having a discharge port and a return port; the first end of the indoor heat exchanger is connected with the first end of the outdoor heat exchanger through a throttling element; the reversing assembly is provided with a first interface to a fourth interface, the first interface is connected with the exhaust port, the second interface is connected with the second end of the outdoor heat exchanger, the third interface is connected with the air return port, and the fourth interface is connected with the second end of the indoor heat exchanger; when the compressor is stopped, the first interface is communicated with the third interface. According to the air conditioner, when the compressor is stopped, the air outlet and the air return port of the compressor can be quickly communicated to realize pressure balance, so that the compressor can be quickly restarted, and the air conditioner is simple in structure and low in cost.

Description

Air conditioner and control method thereof

Technical Field

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

Background

Generally, when a compressor of an air conditioner is stopped from a previous operation to restart, a pressure difference between a discharge port and a return port of the compressor must be within a certain required range before restarting. In particular, for a rolling rotor compressor, the pressure difference must reach a small value, for example 1kgf/cm²Otherwise, the compressor cannot be started again, so that the function of quickly running the air conditioner again after the air conditioner is stopped cannot be realized. However, in the related art, in order to implement the function of quickly restarting the refrigeration device after the shutdown, many parts need to be added to the air conditioner, which increases the number of parts in the air conditioner, resulting in higher cost of the air conditioner.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an air conditioner which can quickly communicate the exhaust port and the return port of the compressor to realize pressure balance when the compressor is stopped, so that the compressor can be quickly restarted, and the air conditioner has the advantages of simple structure and low cost.

The invention also provides a control method of the air conditioner.

An air conditioner according to an embodiment of the present invention includes: a compressor having a discharge port and a return port; the first end of the indoor heat exchanger is connected with the first end of the outdoor heat exchanger through a throttling element; the reversing assembly is provided with a first interface to a fourth interface, the first interface is connected with the exhaust port, the second interface is connected with the second end of the outdoor heat exchanger, the third interface is connected with the air return port, and the fourth interface is connected with the second end of the indoor heat exchanger; when the compressor is stopped, the first interface is communicated with the third interface.

According to the air conditioner provided by the embodiment of the invention, when the compressor is stopped, the first interface is communicated with the third interface, so that the exhaust port and the return port of the compressor can be quickly communicated to realize pressure balance when the compressor is stopped, the compressor can be quickly restarted, and the air conditioner is simple in structure and low in cost.

In some embodiments of the invention, the second port is not in communication with the fourth port when the compressor is shut down.

Optionally, when the compressor is stopped, the third port is communicated with a port connected with a low-pressure side heat exchanger.

In some embodiments of the present invention, the reversing component is a four-way valve.

Optionally, the four-way valve includes: the valve body is internally provided with a valve cavity, and the valve body is provided with the first interface to the fourth interface; the valve core is movably arranged in the valve cavity and provided with a first position to a third position, a communicating part protruding towards the inner wall of the valve cavity is arranged on the valve core, a communicating channel is arranged on the communicating part, a first chamber to a third chamber are defined by the valve core, the communicating part and the inner wall of the valve cavity, the communicating channel is communicated with the second chamber, and the third interface is communicated with the second chamber; in the first position, the first port and the second port are both in communication with the first chamber, and the fourth port is in communication with the second chamber; in the second position, the first port is communicated with the second chamber through the communication passage; in the third position, the second port is in communication with the second chamber, and the first port and the fourth port are both in communication with the third chamber.

In some embodiments of the invention, the valve chamber has first and second opposing side walls, the first port is located on the first side wall, the second to fourth ports are located on the second side wall, a first sub-chamber and a second sub-chamber are defined between the valve core, the communication portion and the first side wall, and a third sub-chamber, a fourth sub-chamber and the second chamber are defined between the valve core and the second side wall, wherein the third sub-chamber and the first sub-chamber are located on the same side of the second chamber and communicate to define the first chamber, and the second sub-chamber and the fourth sub-chamber are located on the same side of the second chamber and communicate to define the third chamber.

Optionally, the valve cartridge comprises: the first blocking block and the second blocking block are arranged at intervals in the moving direction of the valve core; the connecting plate is connected between the first blocking block and the second blocking block, the communicating part protruding towards the direction close to the first side wall is formed on the surface of the connecting plate facing the first side wall, the communicating part, the connecting plate, the first blocking block and the first side wall define the first sub-chamber, and the communicating part, the connecting plate, the second blocking block and the first side wall define the second sub-chamber; the first separation plate and the second separation plate are arranged on the surface, far away from the first side wall, of the connecting plate and are arranged in a spaced mode in the moving direction of the valve core, the first separation plate is located between the second separation plate and the first blocking block, the first separation plate, the second separation plate, the connecting plate and the second side wall define the second chamber, the first blocking block, the first separation plate, the connecting plate and the second side wall define the third sub-chamber, and the second separation plate, the second blocking block, the connecting plate and the second side wall define the fourth sub-chamber.

In some optional embodiments of the present invention, the first blocking block, the second blocking block, the connecting plate, the communicating portion, the first partition plate, and the second partition plate are integrally formed.

Optionally, the four-way valve further includes a first connection pipe and a second connection pipe, the first connection pipe is connected to the second interface and the third interface respectively, the first connection pipe is connected in series with a first control valve, the second connection pipe is connected to the third interface and the fourth interface respectively, and the second connection pipe is connected in series with a second control valve; a surface of the communication portion facing the first side wall defines a first stop surface and a second stop surface spaced apart by an end of the communication channel facing the first side wall; a surface of the first divider plate facing the second side wall defines a third stop surface, a surface of the second divider plate facing the second side wall defines a fourth stop surface, and the spool has a fourth position and a fifth position; at the fourth position, the first stop surface blocks the first port, the fourth stop surface blocks the fourth port, the first control valve is disconnected, the second control valve is opened, and the second port is not communicated with the third port; in the fifth position, the second stop surface blocks the first port, the third stop surface blocks the second port, the first control valve is opened, the second control valve is disconnected, and the third port and the fourth port are not communicated.

In some alternative embodiments of the present invention, the four-way valve includes a solenoid control for actuating movement of the spool.

In some embodiments of the invention, the throttling element is an electronic expansion valve, a thermal expansion valve, or a capillary tube.

According to the control method of the air conditioner, the air conditioner is the air conditioner, and the control method comprises the following steps: controlling the compressor to start, controlling the first interface and the third interface to be disconnected, and conducting the third interface and an interface of the reversing assembly, which is connected with the low-pressure side heat exchanger; detecting the discharge pressure P1 of the compressor and the pressure P2 of the high-pressure side heat exchanger; and when the P1 is more than or equal to P2, controlling the first interface to be communicated with the interface of the reversing assembly, which is connected with the high-pressure side heat exchanger.

According to the control method of the air conditioner, when the compressor is controlled to be started, the first interface and the third interface are controlled to be disconnected, the third interface is connected with the interface, connected with the low-pressure side heat exchanger, of the reversing assembly, the return port of the compressor can suck the refrigerant in the low-pressure side heat exchanger, so that the exhaust pressure P1 of the compressor can be increased rapidly, and when the pressure P1 is larger than or equal to P2, the first interface is controlled to be connected with the interface, connected with the high-pressure side heat exchanger, of the reversing assembly, so that the refrigerant of the high-pressure side heat exchanger can be prevented from flowing back to the exhaust port of the compressor, and the success rate of starting the compressor can be improved.

In some embodiments of the invention, the pressure at the first interface is sensed to obtain a discharge pressure P1 of the compressor.

According to the control method of the air conditioner, the air conditioner is the air conditioner, and the control method comprises the following steps: controlling the compressor to start, controlling the first interface and the third interface to be disconnected, and conducting the third interface and an interface of the reversing assembly, which is connected with the low-pressure side heat exchanger; and after t seconds, controlling the first interface to be communicated with the interface of the reversing assembly, which is connected with the high-pressure side heat exchanger.

According to the control method of the air conditioner, when the compressor is controlled to be started, the first interface and the third interface are controlled to be disconnected, the third interface is connected with the interface, connected with the low-pressure side heat exchanger, of the reversing assembly, the air return port of the compressor can suck the refrigerant in the low-pressure side heat exchanger, so that the exhaust pressure P1 of the compressor can be increased rapidly, and after t seconds, the first interface is controlled to be communicated with the interface, connected with the high-pressure side heat exchanger, of the reversing assembly, so that the refrigerant of the high-pressure side heat exchanger can be prevented from flowing back to the exhaust port of the compressor, and the success rate of starting the compressor can be improved.

In some embodiments of the present invention, 1 ≦ t ≦ 10.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a four-way valve according to one embodiment of the present invention, wherein the valve spool is in a first position;

FIG. 2 is a schematic diagram of the valve spool of the four-way valve of FIG. 1 in a second position;

FIG. 3 is a schematic diagram of the valve spool of the four-way valve of FIG. 2 in a third position;

FIG. 4 is a schematic communication diagram of the interface states of the four-way valve of FIG. 1, wherein the first interface is in communication with the second interface and the third interface is in communication with the fourth interface;

FIG. 5 is a schematic communication diagram of the states of the ports of the four-way valve of FIG. 2, wherein the first port is in communication with the third port and the second port and the fourth port are both disconnected;

FIG. 6 is a schematic communication diagram of the interface states of the four-way valve of FIG. 3, wherein the first interface is in communication with the fourth interface and the second interface is in communication with the third interface;

FIG. 7 is a schematic diagram of the communication of a four-way valve according to yet another embodiment of the present invention, wherein the first port is in communication with the second port and the third port is in communication with the fourth port;

FIG. 8 is a schematic diagram of the four-way valve of FIG. 7 with the first port in communication with the third port and the second and fourth ports disconnected;

FIG. 9 is a schematic diagram of the communication of the four-way valve according to FIG. 7, wherein the first port is in communication with the fourth port and the second port is in communication with the third port;

FIG. 10 is a schematic diagram of the communication of a four-way valve according to yet another embodiment of the present invention, wherein the first port is in communication with the second port and the third port is in communication with the fourth port;

FIG. 11 is a schematic illustration of the communication of the four-way valve of FIG. 10 with the first port, the third port, and the fourth port in communication and the second port disconnected;

FIG. 12 is a schematic diagram of the communication of the four-way valve of FIG. 10, wherein the first port is in communication with the fourth port and the second port is in communication with the third port;

FIG. 13 is a schematic diagram of a four-way valve according to another embodiment of the present invention, wherein the valve spool is in a first position;

FIG. 14 is a schematic view of a communication configuration of the four-way valve of FIG. 13 with the valve spool in a fourth position;

FIG. 15 is a schematic view of the communication configuration of the four-way valve of FIG. 13 with the valve spool in a second position;

FIG. 16 is a schematic view of a communication configuration of the four-way valve of FIG. 13 with the valve spool in a fifth position;

FIG. 17 is a schematic view of a communication configuration of the four-way valve of FIG. 13 with the valve spool in a third position;

FIG. 18 is a schematic structural view of an air conditioner according to some embodiments of the present invention, wherein the valve cartridge is in a first position;

FIG. 19 is a schematic structural view of an air conditioner according to some embodiments of the present invention, wherein the valve cartridge is in a third position;

FIG. 20 is a schematic structural view of an air conditioner according to some embodiments of the present invention, wherein the valve cartridge is in a second position;

fig. 21 is a schematic structural view of an air conditioner according to some embodiments of the present invention, wherein the valve spool is located at the second position and the third port communicates with the fourth port.

Reference numerals:

an air conditioner 100;

a four-way valve 10;

a first interface 101; a second interface 102; a third interface 103; a fourth interface 104;

a valve body 1; a first side wall 1 a; a second side wall 1 b;

a valve chamber 11; a first chamber 111; a first sub-chamber 1111; a third sub-chamber 1112; a second chamber 112; a third chamber 113; the second sub-chamber 1131; a fourth sub-chamber 1132;

a valve core 2; a communicating portion 21; a communication passage 211; a first cut-off surface 21 a; a second stop surface 21 b;

a first barrier block 22; a second barrier block 23; a connecting plate 24; a first communication port 241; a second communication port 242;

a first partition plate 25; a third stop surface 251; a second partition plate 26; a fourth stop surface 261;

an electromagnetic control 3;

a first connecting pipe 4; the first control valve 41;

a second connection pipe 5; the second control valve 51;

a compressor 20; an exhaust port 201; a return air port 202;

an indoor heat exchanger 30;

an outdoor heat exchanger 40;

a throttling element 50.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

A four-way valve 10 according to an embodiment of the present invention is described below with reference first to fig. 1-17.

As shown in fig. 1 to 12, according to the four-way valve 10 of the embodiment of the present invention, the four-way valve 10 includes a valve body 1 and a valve core 2, a valve chamber 11 is defined in the valve body 1, a first port 101 to a fourth port 104 are provided on the valve body 1, the valve core 2 is movably disposed in the valve chamber 11 and has a first position to a third position, a communicating portion 21 protruding toward an inner wall of the valve chamber 11 is provided on the valve core 2, the communicating portion 21 is provided with a communicating passage 211, the communicating portion 21 and the inner wall of the valve chamber 11 define a first chamber 111, a second chamber 112 and a third chamber 113, the communicating passage 211 communicates with the second chamber 112, and the third port 103 communicates with the second chamber 112.

Referring to fig. 1, in the first position, the first port 101 and the second port 102 are both in communication with the first chamber 111, and the fourth port 104 is in communication with the second chamber 112 such that the third port 103 is in communication with the fourth port 104; referring to fig. 2, in the second position, the first port 101 communicates with the second chamber 112 through the communication passage 211, so that the first port 101 communicates with the third port 103; referring to fig. 3, in the third position, the second port 102 is in communication with the second chamber 112, and the first port 101 and the fourth port 104 are both in communication with the third chamber 113, such that the second port 102 is in communication with the third port 103, and the first port 101 is in communication with the fourth port 104. Therefore, the first interface 101, the second interface 102, the third interface 103 and the fourth interface 104 can be communicated in various ways, which is beneficial to meeting the diversified requirements of the air conditioner 100 on the flow path switching function of the four-way valve 10.

For example, as shown in fig. 18 to 20, when the four-way valve 10 is applied to the air conditioner 100, the air conditioner 100 further includes: the compressor 20 has a discharge port 201 and a return port 202, the indoor heat exchanger 30, the outdoor heat exchanger 40, and the throttling element 50, and the first end of the indoor heat exchanger 30 is connected to the first end of the outdoor heat exchanger 40 through the throttling element 50. The four-way valve 10 has a first port 101 to a fourth port 104, the first port 101 is connected to the exhaust port 201, the second port 102 is connected to the second end of the outdoor heat exchanger 40, the third port 103 is connected to the return port 202, and the fourth port 104 is connected to the second end of the indoor heat exchanger 30; when the compressor 20 is stopped, the first port 101 communicates with the third port 103.

Specifically, the valve element 2 is movable in the left-right direction, and as shown in fig. 1 and 18, when the valve element 2 is in the first position, the first port 101 and the second port 102 are both communicated with the first chamber 111, the fourth port 104 is communicated with the second chamber 112, that is, the first port 101 and the second port 102 are communicated, and the third port 103 is communicated with the fourth port 104, so that the outdoor heat exchanger 40 is a high-pressure side heat exchanger, the indoor heat exchanger 30 is a low-pressure side heat exchanger, and the air conditioner 100 operates in a cooling condition;

as shown in fig. 3 and 19, when the valve core 2 is in the third position, the second port 102 and the third port 103 are both communicated with the second chamber 112, and the first port 101 and the fourth port 104 are both communicated with the third chamber 113, so that the indoor heat exchanger 30 is a high-pressure side heat exchanger, the outdoor heat exchanger 40 is a low-pressure side heat exchanger, and the air conditioner 100 operates under a heating condition;

referring to fig. 2 and 20, when the compressor 20 is stopped, the valve core 2 moves to the second position, the first port 101, the communication passage 211, the second chamber 112 and the third port 103 are communicated with each other, and the second port 102 and the third port 103 are disconnected from the other ports, so that the exhaust port 201 and the return port 202 of the compressor 20 can be quickly communicated to realize pressure balance when the compressor 20 is stopped, and the compressor 20 can be quickly restarted, and the structure is simple and low in cost.

According to the four-way valve 10 of the embodiment of the invention, the valve core 2 is provided with the first position, the second position and the third position, so that the four-way valve 10 has various functions, when the four-way valve 10 is used for the air conditioner 100, the first interface 101, the second interface 102, the third interface 103 and the fourth interface 104 can be communicated in various ways, and the requirement of the air conditioner 100 on the diversification of the flow path switching function of the four-way valve 10 can be favorably met.

In some embodiments of the present invention, referring to fig. 13-17, the valve chamber 11 has a first side wall 1a and a second side wall 1b (as shown in fig. 13) opposite to each other, the first port 101 is located on the first side wall 1a, the second port 102, the third port 103 and the fourth port 104 are located on the second side wall 1b, the valve core 2, the communication portion 21 and the first side wall 1a define a first sub-chamber 1111 and a second sub-chamber 1131, and the valve core 2 and the second side wall 1b define a third sub-chamber 1112, a fourth sub-chamber 1132 and a second chamber 112, wherein the third sub-chamber 1112 and the first sub-chamber 1111 are located on the same side of the second chamber 112 and communicate to define a first chamber 111, and the second sub-chamber 1131 and the fourth sub-chamber 1132 are located on the same side of the second chamber 112 and communicate to define a third chamber 113. It will be appreciated that first sub-chamber 1111 communicates with second sub-chamber 1131, and third sub-chamber 1112 communicates with fourth sub-chamber 1132. Therefore, the reversing function of the four-way valve 10 is realized conveniently, and the reversing of the four-way valve 10 is reliable.

For example, as shown in fig. 13 and 18, when the valve core 2 is in the first position, the first port 101, the first sub-chamber 1111, the second sub-chamber 1131 and the second port 102 are communicated, and the third port 103, the second chamber 112 and the fourth port 104 are communicated, so that the outdoor heat exchanger 40 is a high-pressure side heat exchanger, the indoor heat exchanger 30 is a low-pressure side heat exchanger, and the air conditioner 100 operates under a refrigeration condition;

as shown in fig. 17 and 19, when the valve core 2 is in the third position, the second port 102, the second chamber 112 and the third port 103 are communicated with each other, and the first port 101, the third sub-chamber 1112, the fourth sub-chamber 1132 and the fourth port 104 are communicated with each other, so that the indoor heat exchanger 30 is a high-pressure side heat exchanger, the outdoor heat exchanger 40 is a low-pressure side heat exchanger, and the air conditioner 100 operates under a heating condition;

as shown in fig. 15 and 20, when the spool 2 is in the second position, the first port 101, the communication passage 211, the second chamber 112, and the third port 103 communicate with each other, and the second port 102 and the third port 103 are disconnected from the other ports. Of course, the present invention is not limited to this, and for example, when the compressor is stopped in a cooling state, as shown in fig. 15 and 21, when the spool 2 moves to the second position, the first port 101, the communication passage 211, the second chamber 112, and the third port 103 communicate with each other, the second port 102 is disconnected, and the third port 103 and the fourth port 104 communicate with each other; for another example, when the compressor is stopped in the heating state, and the valve element 2 is in the second position, the first port 101, the communication passage 211, the second chamber 112, and the third port 103 are communicated with each other, the third port 103 is disconnected, and the third port 103 is communicated with the second port 102.

Alternatively, referring to fig. 13 to 17, the valve body 2 includes a first blocking block 22, a second blocking block 23, a connecting plate 24, a first partition plate 25, and a second partition plate 26, the first blocking block 22 and the second blocking block 23 are disposed at intervals in the moving direction of the valve body 2 (for example, as shown in fig. 16, the first blocking block 22 and the second blocking block 23 are disposed at intervals in the left-right direction), the connecting plate 24 is connected between the first blocking block 22 and the second blocking block 23, a surface of the connecting plate 24 facing the first side wall 1a is formed with a communicating portion 21 protruding toward a direction close to the first side wall 1a, the communicating portion 21, the connecting plate 24, the first blocking block 22, and the first side wall 1a define a first sub-chamber 1111, and the communicating portion 21, the connecting plate 24, the second blocking block 23, and the first side wall 1a define a second sub-chamber 1131.

Further, as shown in fig. 13 to 17, a first partition plate 25 and a second partition plate 26 are provided on a surface of the connecting plate 24 remote from the first side wall 1a and are spaced apart in the moving direction of the spool 2 (for example, as shown in fig. 16, the first partition plate 25 and the second partition plate 26 are provided on a lower surface of the connecting plate 24 and are spaced apart in the left-right direction), the first partition plate 25 is located between the second partition plate 26 and the first blocking block 22, the first partition plate 25, the second partition plate 26, the connecting plate 24, and the second side wall 1b define the second chamber 112, the first blocking block 22, the first partition plate 25, the connecting plate 24, and the second side wall 1b define the third sub-chamber 1112, and the second partition plate 26, the second blocking block 23, the connecting plate 24, and the second side wall 1b define the fourth sub-chamber 1132. Therefore, the valve core 2 has simple and reliable structure, and is beneficial to realizing the reversing function of the four-way valve 10. Alternatively, as shown in fig. 13, the connection plate 24 is provided with a first communication port 241 and a second communication port 242 which are arranged at an interval in the left-right direction, the first communication port 241 and the second communication port 242 penetrate the connection plate 24 in the thickness direction of the connection plate 24, the first communication port 241 is used for communicating the first sub-chamber 1111 with the second sub-chamber 1131, and the second communication port 242 is used for communicating the third sub-chamber 1112 with the fourth sub-chamber 1132.

In some alternative embodiments of the present invention, the first barrier block 22, the second barrier block 23, the connecting plate 24, the communicating portion 21, the first partition plate 25 and the second partition plate 26 are integrally formed pieces. Therefore, the valve core 2 is simple to manufacture, redundant assembly parts and connection procedures are omitted, the assembly efficiency of the valve core 2 is greatly improved, and the reliability of the operation of the valve core 2 is guaranteed. For example, as shown in fig. 1 to 6, the first port 101 is located on the first side wall 1a, and the second port 102, the third port 103, and the fourth port 104 are located on the second side wall 1b and arranged in sequence, and the cross section of the valve body 1 may be formed in a circular shape or a square shape. Optionally, the four-way valve 10 is a metallic piece.

Of course, the present invention is not limited to this, the flow path scheme inside the four-way valve 10 can also be as shown in fig. 7-9, and the main difference from the embodiment in fig. 1 is that the second port 102 and the fourth port 104 are located on the first side wall 1a, and the first port 101 and the third port 103 are located on the second side wall 1b, and the specific structure thereof is not described in detail here.

Alternatively, as shown in fig. 13 and 17, the four-way valve 10 further includes a first connection pipe 4 and a second connection pipe 5, the first connection pipe 4 is connected to the second port 102 and the third port 103, respectively, the first connection pipe 4 is connected in series with the first control valve 41, the second connection pipe 5 is connected to the third port 103 and the fourth port 104, respectively, and the second connection pipe 5 is connected in series with the second control valve 51. For example, the first control valve 41 and the second control valve 51 have signals transmitted to the control system of the air conditioner 100, and the on and off of the first control valve 41 and the second control valve 51 can be independently controlled by the control system of the air conditioner 100.

Referring to fig. 13 to 17, a surface of the communication portion 21 facing the first side wall 1a defines a first cut-off surface 21a and a second cut-off surface 21b, the first cut-off surface 21a and the second cut-off surface 21b being spaced apart by an end of the communication channel 211 facing the first side wall 1a, for example, as shown in fig. 13 to 17, an upper surface of the communication portion 21 defines a first cut-off surface 21a and a second cut-off surface 21b, the first cut-off surface 21a and the second cut-off surface 21b being spaced apart by an upper end of the communication channel 211.

Referring to fig. 13 to 17, the surface of the first partition plate 25 facing the second side wall 1b defines a third shut-off surface 251, the surface of the second partition plate 26 facing the second side wall 1b defines a fourth shut-off surface 261, and the spool 2 has a fourth position and a fifth position. For example, as shown in fig. 13 to 17, the lower surface of the first partition plate 25 defines a third stop surface 251, the lower surface of the second partition plate 26 defines a fourth stop surface 261, and the spool 2 has a fourth position and a fifth position.

As shown in fig. 14, in the fourth position, the first stop surface 21a blocks the first port 101, the fourth stop surface 261 blocks the fourth port 104, the first control valve 41 is off and the second control valve 51 is open, the second port 102 and the third port 103 are not in conduction, so that in the fourth position, the first port 101 and the third port 103 can be disconnected from each other, the second port 102 and the third port 103 are not in conduction, and the third port 103 and the fourth port 104 are in conduction.

As shown in fig. 16, in the fifth position, the second stop surface 21b blocks the first port 101, the third stop surface 251 blocks the second port 102, the first control valve 41 is opened, the second control valve 51 is opened, and the third port 103 and the fourth port 104 are not in communication with each other. In the fourth position, the first interface 101 and the third interface 103 can be disconnected from each other, the third interface 103 and the fourth interface 104 are not conducted, and the second interface 102 and the third interface 103 are conducted.

In some alternative embodiments of the invention, as shown with reference to fig. 13-17, the four-way valve 10 comprises a solenoid control member 3, the solenoid control member 3 being adapted to drive the movement of the spool 2. This is advantageous in that a reliable movement of the valve slide 2 between the first, second and third positions is achieved. Of course, the present invention is not limited to this, and the movement of the spool 2 may be driven by a pilot valve assembly, and the movement of the spool 2 among the first position, the second position, and the third position may be realized.

As shown in fig. 18 to 21, the air conditioner 100 according to the embodiment of the present invention may include: the compressor 20 has a discharge port 201 and a return port 202, the indoor heat exchanger 30 has a first end connected to a first end of the outdoor heat exchanger 40 through a throttling element 50, the outdoor heat exchanger 40, and a reversing assembly.

Referring to fig. 1 to 9, the reversing assembly has a first port 101 to a fourth port 104, the first port 101 is connected to the exhaust port 201, the second port 102 is connected to the second end of the outdoor heat exchanger 40, the third port 103 is connected to the return port 202, and the fourth port 104 is connected to the second end of the indoor heat exchanger 30; when the compressor 20 is stopped, the first port 101 communicates with the third port 103. For example, the reversing component is a four-way valve 10, the four-way valve 10 has a first port 101 to a fourth port 104, the first port 101 is connected to the exhaust port 201, the second port 102 is connected to the second end of the outdoor heat exchanger 40, the third port 103 is connected to the return port 202, and the fourth port 104 is connected to the second end of the indoor heat exchanger 30; when the compressor 20 is stopped, the first port 101 communicates with the third port 103.

As shown in fig. 1 and 18, the valve element 2 can move in the left-right direction, when the valve element 2 is in the first position, the first port 101 and the second port 102 are both communicated with the first chamber 111, and the fourth port 104 is communicated with the second chamber 112, so that the outdoor heat exchanger 40 is a high-pressure side heat exchanger, the indoor heat exchanger 30 is a low-pressure side heat exchanger, and the air conditioner 100 operates under a refrigeration condition;

referring to fig. 2 and 20, when the compressor 20 is stopped, the valve spool 2 moves to the second position, the first port 101 communicates with the second chamber 112 through the communication passage 211, and the second port 102 or the third port 103 communicating with the high pressure side heat exchanger is disconnected from the other ports, so that the exhaust port 201 and the return port 202 of the compressor 20 can be quickly communicated to achieve pressure balance when the compressor 20 is stopped, and the compressor 20 can be quickly restarted, and the structure is simple and low in cost. Of course, the present invention is not limited thereto, and the reversing assembly may be constructed of a plurality of pipes having control valves.

According to the air conditioner 100 of the embodiment of the invention, when the compressor 20 is stopped, the first interface 101 is communicated with the third interface 103, so that the exhaust port 201 and the return port 202 of the compressor 20 can be quickly communicated to realize pressure balance when the compressor 20 is stopped, the compressor 20 can be quickly restarted, and the air conditioner is simple in structure and low in cost.

In some embodiments of the present invention, the second port 102 is not in communication with the fourth port 104 when the compressor 20 is off. Thus, when the compressor 1 is stopped, the high-pressure side heat exchanger is kept in a high-pressure state (it can be understood that when the air conditioner 100 is refrigerating, the high-pressure side heat exchanger is the outdoor heat exchanger 40, and when the air conditioner 100 is refrigerating, the high-pressure side heat exchanger is the indoor heat exchanger 30), and when the compressor 20 is stopped, the second interface 102 is not communicated with the fourth interface 104, so that the throttling element 50 still has a certain flow rate under the action of the pressure difference, the residual heat of the high-pressure side heat exchanger can still release heat, and the low-pressure side heat exchanger can still have the capacity of evaporating and absorbing heat, thereby improving the overall efficiency of the air conditioner 100. For example, the second port 102 and the fourth port 104 are both in the disconnected state, in other words, the refrigerant cannot flow out from the second port 102 and the fourth port 104.

Alternatively, the third port 103 communicates with the port to which the low pressure side heat exchanger is connected when the compressor 20 is stopped. It should be noted that, when the compressor 20 is stopped, the first port 101 is communicated with the third port 103, so that the exhaust port 201 and the return port 202 of the compressor 20 can be quickly communicated to achieve pressure balance, at this time, the pressure of the refrigerant in the low-pressure side heat exchanger is greater than the pressure of the refrigerant between the exhaust port 201 and the return port 202 of the compressor 20, and when the compressor 20 is stopped, by communicating the third port 103 with the port connected with the low-pressure side heat exchanger, the pressure difference between the high-pressure side heat exchanger and the low-pressure side heat exchanger can be increased, which is beneficial to improving the overall efficiency of the air conditioner 100.

For example, when the air conditioner 100 is in the cooling mode before the compressor 20 is stopped, as shown in fig. 21, when the compressor 20 is stopped, the high-pressure side heat exchanger is the outdoor heat exchanger 40, and the low-pressure side heat exchanger is the indoor heat exchanger 30, so that the first port 101 is controlled to be communicated with the third port 103, and the third port 103 is controlled to be communicated with the fourth port 104; when the air conditioner 100 is in a heating mode before the compressor 20 is stopped, and when the compressor 20 is stopped, the high-pressure side heat exchanger is the indoor heat exchanger 30, and the low-pressure side heat exchanger is the outdoor heat exchanger 40, the first port 101 is controlled to be communicated with the third port 103, and the third port 103 is controlled to be communicated with the second port 102.

In some embodiments of the present invention, the throttling element 50 is an electronic expansion valve, a thermal expansion valve, or a capillary tube. Thus, the throttling capacity of the throttling element 50 is advantageously ensured, thereby facilitating an increase in the operating efficiency of the air conditioner 100.

As shown in fig. 13 to 21, according to a control method of the air conditioner 100 according to the embodiment of the present invention, the air conditioner 100 is the air conditioner 100 according to the above-described embodiment of the present invention, and the control method includes: and controlling the compressor 20 to start, controlling the first interface 101 and the third interface 103 to be disconnected, and conducting the third interface 103 and the interface of the reversing assembly, which is connected with the low-pressure side heat exchanger. By connecting the third port 103 to the port of the reversing assembly that is connected to the low-pressure side heat exchanger, the return port 202 of the compressor 20 can suck the refrigerant in the low-pressure side heat exchanger when the compressor 20 is started, thereby facilitating a rapid increase in the discharge pressure P1 of the compressor 20.

For example, when the compressor 20 is stopped, the first port 101 and the third port 103 are communicated (of course, the first port 101 and the third port 103 may be communicated, and the third port 103 is communicated with a port connected to the low-pressure side heat exchanger), if the compressor 20 performs a cooling operation before the stop, at this time, the outdoor heat exchanger 40 is a high-pressure side heat exchanger, the indoor heat exchanger 30 is a low-pressure side heat exchanger, the control system of the air conditioner 100 may control the reversing component to communicate the third port 103 with the fourth port 104, but delay the communication between the first port 101 and the second port 102, so that the compressor 20 is rapidly started, and during the start of the compressor 20, the return air port 202 of the compressor 20 may suck the refrigerant in the indoor heat exchanger 30 to rapidly increase the pressure;

if the air conditioner 100 is in heating operation before shutdown, in which the outdoor heat exchanger 40 is a low-pressure side heat exchanger and the indoor heat exchanger is a high-pressure side heat exchanger, the control system of the air conditioner 100 may control the reversing component to communicate the third port 103 with the second port 102 but to delay communication between the first port 101 and the fourth port 104, so that the compressor 20 is rapidly started, and during the start-up of the compressor 20, the return air port 202 of the compressor 20 may suck the refrigerant in the outdoor heat exchanger 40 to rapidly increase the pressure.

Then, the discharge pressure P1 of the compressor 20 and the pressure P2 of the high-pressure side heat exchanger are detected, for example, pressure sensors may be respectively disposed in the flow paths of the outdoor heat exchanger 40 and the outdoor heat exchanger 40, the pressure P2 of the high-pressure side heat exchanger is detected by the pressure sensors, and when P1 is equal to or greater than P2, the first port 101 is controlled to communicate with the port of the reversing assembly connected to the high-pressure side heat exchanger.

For example, when P1 < P2, the disconnected first port 101 is kept communicated with the high-pressure side heat exchanger if the compressor 20 is not stopped until P1 is more than or equal to P2, and then the first port 101 is controlled to be communicated with the port of the reversing assembly connected with the high-pressure side heat exchanger; when P1 < P2, the first port 101 and the third port 103 are communicated to balance the pressure between the return port 202 and the exhaust port 201 of the compressor 20 if the compressor 20 is stopped, and then the first port 101 and the third port 103 are controlled to be disconnected and the compressor 20 is started again. This prevents the refrigerant in the high-pressure side heat exchanger from flowing back to the discharge port 201 of the compressor 20, which is advantageous for increasing the success rate of starting the compressor 20.

According to the control method of the air conditioner 100 in the embodiment of the invention, when the compressor 20 is controlled to start, the first interface 101 and the third interface 103 are controlled to be disconnected, and the third interface 103 is connected with the interface of the reversing assembly, which is connected with the low-pressure side heat exchanger, so that when the compressor 20 is started, the return air port 202 of the compressor 20 can suck the refrigerant in the low-pressure side heat exchanger, thereby facilitating the rapid increase of the exhaust pressure P1 of the compressor 20, and when P1 is greater than or equal to P2, the first interface 101 is controlled to be connected with the interface connected with the high-pressure side heat exchanger, thereby preventing the refrigerant of the high-pressure side heat exchanger from flowing back to the exhaust port 201 of the compressor 20, thereby facilitating the improvement of the success rate of the start of the compressor 20.

In some embodiments of the present invention, the pressure at the first port 101 is sensed to obtain a discharge pressure P1 of the compressor 20. Thereby, detection of the discharge pressure P1 of the compressor 20 is facilitated. For example, a pressure sensor may be provided at the first port 101 to obtain a discharge pressure P1 of the compressor 20.

According to the control method of the air conditioner 100 of the embodiment of the present invention, the air conditioner 100 is the air conditioner 100 according to the above-mentioned embodiment of the present invention, and the control method includes: and controlling the compressor 20 to start, controlling the first interface 101 and the third interface 103 to be disconnected, and conducting the third interface 103 and the interface of the reversing assembly, which is connected with the low-pressure side heat exchanger. By connecting the third port 103 to the port of the reversing assembly that is connected to the low-pressure side heat exchanger, the return port 202 of the compressor 20 can suck the refrigerant in the low-pressure side heat exchanger when the compressor 20 is started, thereby facilitating a rapid increase in the discharge pressure P1 of the compressor 20.

For example, the control system of the air conditioner 100 may record the working state of cooling or heating before the compressor 20 is stopped, when the compressor 20 is stopped, the first port 101 and the third port 103 are communicated (of course, the first port 101 and the third port 103 may be communicated, and the third port 103 is communicated with the port connected to the low-pressure side heat exchanger), if the compressor 20 is in cooling operation before the compressor is stopped, at this time, the outdoor heat exchanger 40 is a high-pressure side heat exchanger, the indoor heat exchanger 30 is a low-pressure side heat exchanger, the control system of the air conditioner 100 may control the reversing component to communicate the third port 103 and the fourth port 104, but delay communication between the first port 101 and the second port 102 to enable the compressor 20 to start quickly, and when the compressor 20 is started, the return port 202 of the compressor 20 may suck the refrigerant in the indoor heat exchanger 30 to boost quickly;

if the air conditioner 100 is in heating operation before shutdown, in which the outdoor heat exchanger 40 is a low-pressure side heat exchanger and the indoor heat exchanger is a high-pressure side heat exchanger, the control system of the air conditioner 100 may control the reversing component to communicate the third port 103 with the second port 102 but to delay communication between the first port 101 and the fourth port 104, so that the compressor 20 is rapidly started, and when the compressor 20 is started, the return air port 202 of the compressor 20 may suck the refrigerant in the outdoor heat exchanger 40 to rapidly increase the pressure.

And after t seconds, controlling the first interface 101 to be communicated with the interface connected with the high-pressure side heat exchanger. It should be noted that the discharge pressure of the compressor 20 continuously increases within t seconds of delaying the communication between the first connection port 101 and the high pressure side heat exchanger, and the value of t may be controlled such that the discharge pressure P1 of the compressor 20 is greater than the pressure P2 of the high pressure side heat exchanger when the connection port of the first connection port 101 and the high pressure side heat exchanger is communicated.

For example, after t seconds, if the compressor 20 is not stopped, the first port 101 is controlled to be communicated with the port connected with the high-pressure side heat exchanger, if the compressor 20 is stopped, the first port 101 and the third port 103 are communicated to balance the pressure between the return air port 202 and the exhaust port 201 of the compressor 20, and finally the first port 101 and the third port 103 are controlled to be disconnected and the compressor 20 is started again. This prevents the refrigerant in the high-pressure side heat exchanger from flowing back to the discharge port 201 of the compressor 20, which is advantageous for increasing the success rate of starting the compressor 20.

According to the control method of the air conditioner 100 in the embodiment of the invention, when the compressor 20 is controlled to start, the first interface 101 and the third interface 103 are controlled to be disconnected, and the third interface 103 is connected with the interface of the reversing assembly, which is connected with the low-pressure side heat exchanger, so that the refrigerant in the low-pressure side heat exchanger can be sucked into the air return port 202 of the compressor 20, and therefore, the discharge pressure P1 of the compressor 20 can be increased rapidly, and after t seconds, the first interface 101 is controlled to be connected with the interface of the reversing assembly, which is connected with the high-pressure side heat exchanger, so that the refrigerant in the high-pressure side heat exchanger can be prevented from flowing back to the air outlet 201 of the compressor 20, and the success rate of starting the compressor 20 can be improved.

In some embodiments of the present invention, 1 ≦ t ≦ 10. Therefore, on one hand, when t is not too small, and communication between the first port 101 and the port connected to the high-pressure side heat exchanger cannot be ensured, the discharge pressure P1 of the compressor 20 is greater than the pressure P2 of the high-pressure side heat exchanger, and on the other hand, t is not too large, so that the starting time of the compressor 20 is not too long. For example, t may be 1, 3, 5, 8, or 10. Preferably, 2. ltoreq. t.ltoreq.6.

A control method of the air conditioner 100 according to some embodiments of the present invention will be described with reference to fig. 13-21, in which the direction changing assembly is the four-way valve 10 according to fig. 13-17.

The first embodiment,

Referring to fig. 13 to 20, when the air conditioner 100 is stopped in the cooling mode, the control system of the air conditioner 100 controls the solenoid controller 3 to move the valve spool 2 from the first position (the first control valve 41 is turned off and the second control valve 51 is turned off as shown in fig. 13 and 18) to the left to the second position (the first control valve 41 is turned off and the second control valve 51 is turned off as shown in fig. 15 and 20), and the first port 101 communicates with the second chamber 112 through the communication passage 211 to communicate with the third port 103, so that the exhaust port 201 and the return port 202 of the compressor 20 can be quickly communicated to achieve pressure balance when the compressor 20 is stopped.

When the air conditioner 100 controls the compressor 20 to start and switch to the cooling mode, the valve spool 2 moves from the second position (as shown in fig. 15 and 20) to the right to the fourth position (as shown in fig. 14), the first stop surface 21a blocks the first port 101, the fourth stop surface 261 blocks the fourth port 104, the first control valve 41 is turned off, the second control valve 51 is opened, the second port 102 and the third port 103 are not communicated, and the third port 103 and the fourth port 104 are communicated, so that the refrigerant in the indoor heat exchanger 30 can be sucked into the return port 202 of the compressor 20 to be rapidly pressurized during the start of the compressor 20;

the discharge pressure P1 of the compressor 20 and the pressure P2 of the outdoor heat exchanger 40 are detected, when P1 is equal to or more than P2, the control valve core 2 moves from the fourth position (shown in FIG. 14) to the right to the first position (shown in FIGS. 13 and 18), so that the first port 101 is communicated with the second port 102 of the four-way valve 10. Accordingly, the refrigerant of the outdoor heat exchanger 40 is prevented from flowing back to the discharge port 201 of the compressor 20, thereby contributing to an increase in the success rate of starting the compressor 20.

When the air conditioner 100 is stopped in the heating mode, as shown in fig. 1, the control system of the air conditioner 100 controls the electromagnetic control member 3 to move the valve spool 2 rightward from the third position (the first control valve 41 is turned off and the second control valve 51 is turned off as shown in fig. 17 and 19) to the second position (the first control valve 41 is turned off and the second control valve 51 is turned off as shown in fig. 15 and 20), the first port 101 communicates with the second chamber 112 through the communication passage 211 to communicate with the third port 103, so that the exhaust port 201 and the return port 202 of the compressor 20 can be quickly communicated to achieve pressure balance when the compressor 20 is stopped.

When the air conditioner 100 controls the compressor 20 to start and switch to the heating mode, the valve element 2 moves from the second position (as shown in fig. 15) to the fifth position (as shown in fig. 16) to the left, the second stop surface 21b blocks the first port 101, the third stop surface 251 blocks the second port 102, the first control valve 41 is opened, the second control valve 51 is disconnected, the second port 102 is communicated with the third port 103, and the third port 103 is not communicated with the fourth port 104, so that the refrigerant in the outdoor heat exchanger 40 can be sucked into the return port 202 of the compressor 20 to be rapidly pressurized during the start of the compressor 20.

The discharge pressure P1 of the compressor 20 and the pressure P2 of the indoor heat exchanger 30 are detected, and when P1 is equal to or more than P2, the control valve core 2 moves to the left from the fifth position to the third position (as shown in FIG. 13), so that the first interface 101 and the fourth interface 104 of the four-way valve 10 are connected. This prevents the refrigerant in the indoor heat exchanger 30 from flowing back to the discharge port 201 of the compressor 20, which is advantageous for increasing the success rate of starting the compressor 20.

Example II,

Referring to fig. 13 to 19 and 21, when the air conditioner 100 is stopped in the cooling mode, as shown in fig. 1, the control system of the air conditioner 100 controls the electromagnetic control member 3 to move the valve spool 2 leftward from the first position (the first control valve 41 is turned off and the second control valve 51 is turned off as shown in fig. 13) to the second position (the first control valve 41 is turned off and the second control valve 51 is turned on as shown in fig. 15 and 21), the first port 101 communicates with the second chamber 112 through the communication passage 211 to communicate with the third port 103, and the third port 103 communicates with the fourth port 104, so that the exhaust port 201 and the return port 202 of the compressor 20 can be quickly communicated to achieve pressure balance when the compressor 20 is stopped.

When the air conditioner 100 controls the compressor 20 to start and switch to the cooling mode, the valve element 2 moves from the second position (shown in fig. 15) to the right to the fourth position (shown in fig. 14), the first stop surface 21a blocks the first port 101, the fourth stop surface 261 blocks the fourth port 104, the first control valve 41 is disconnected, the second control valve 51 is opened, the second port 102 is not communicated with the third port 103, and the third port 103 is communicated with the fourth port 104, so that the return port 202 of the compressor 20 can suck the refrigerant in the indoor heat exchanger 30 to quickly increase the pressure during the start of the compressor 20;

the discharge pressure P1 of the compressor 20 and the pressure P2 of the outdoor heat exchanger 40 are detected, and when P1 is equal to or more than P2, the control valve core 2 moves from the fourth position (shown in FIG. 14) to the right to the first position (shown in FIG. 13), so that the first port 101 is communicated with the port of the four-way valve 10 connected with the high-pressure side heat exchanger. Accordingly, the refrigerant of the outdoor heat exchanger 40 is prevented from flowing back to the discharge port 201 of the compressor 20, thereby contributing to an increase in the success rate of starting the compressor 20.

When the air conditioner 100 is stopped in the heating mode, as shown in fig. 1, the control system of the air conditioner 100 controls the electromagnetic control member 3 to move the valve spool 2 rightward from the third position (as shown in fig. 17, the first control valve 41 is turned off and the second control valve 51 is turned off) to the second position (as shown in fig. 17, and controls the first control valve 41 to be opened and the second control valve 51 to be turned off), the first port 101 communicates with the second chamber 112 through the communication passage 211 to communicate with the third port 103, and the second port 102 communicates with the third port 103, so that the exhaust port 201 and the return port 202 of the compressor 20 can be quickly communicated to achieve pressure balance when the compressor 20 is stopped.

When the air conditioner 100 controls the compressor 20 to start and switch to the heating mode, the valve element 2 moves leftward from the second position (as shown in fig. 15) to the fifth position (as shown in fig. 16), the second stop surface 21b blocks the first port 101, the third stop surface 251 blocks the second port 102, the first control valve 41 is opened, the second control valve 51 is opened, the second port 102 and the third port 103 are connected, and the third port 103 and the fourth port 104 are not connected. During start-up of the compressor 20, the return port 202 of the compressor 20 may draw refrigerant in the outdoor heat exchanger 40 for rapid pressurization.

The discharge pressure P1 of the compressor 20 and the pressure P2 of the indoor heat exchanger 30 are detected, and when P1 is equal to or more than P2, the control valve core 2 moves leftwards from the fifth position to the third position (as shown in FIG. 13), so that the first port 101 is communicated with the port of the four-way valve 10 connected with the high-pressure side heat exchanger. This prevents the refrigerant in the indoor heat exchanger 30 from flowing back to the discharge port 201 of the compressor 20, which is advantageous for increasing the success rate of starting the compressor 20.

Example III,

Referring to fig. 13 to 20, when the air conditioner 100 is stopped in the cooling mode, as shown in fig. 1, the control system of the air conditioner 100 controls the solenoid control member 3 to move the spool 2 leftward from the first position (the first control valve 41 is turned off and the second control valve 51 is turned off as shown in fig. 13 and 18) to the second position (the first control valve 41 is turned off and the second control valve 51 is turned off as shown in fig. 15 and 20), and the first port 101 communicates with the second chamber 112 through the communication passage 211 to communicate with the third port 103, so that the exhaust port 201 and the return port 202 of the compressor 20 can be quickly communicated to achieve pressure equalization when the compressor 20 is stopped.

When the air conditioner 100 controls the compressor 20 to start and switch to the cooling mode, the valve spool 2 moves from the second position (as shown in fig. 15 and 20) to the right to the fifth position (as shown in fig. 14), the first stop surface 21a blocks the first port 101, the fourth stop surface 261 blocks the fourth port 104, the first control valve 41 is turned off, the second control valve 51 is opened, the second port 102 and the third port 103 are not communicated, and the third port 103 and the fourth port 104 are communicated, so that the refrigerant in the indoor heat exchanger 30 can be sucked into the return port 202 of the compressor 20 to be rapidly pressurized during the start of the compressor 20;

after 5 seconds, the control system of the air conditioner 100 controls the valve spool 2 to move rightward from the fourth position (shown in fig. 14) to the first position (shown in fig. 13 and 18), so that the first port 101 communicates with the port of the four-way valve 10 connected to the high-pressure side heat exchanger. Accordingly, the refrigerant of the outdoor heat exchanger 40 is prevented from flowing back to the discharge port 201 of the compressor 20, thereby contributing to an increase in the success rate of starting the compressor 20.

After 5 seconds, the control system of the air conditioner 100 controls the valve element 2 to move leftward from the fifth position to the third position (as shown in fig. 13), so that the first port 101 communicates with the port of the four-way valve 10 connected to the high-pressure side heat exchanger. This prevents the refrigerant in the indoor heat exchanger 30 from flowing back to the discharge port 201 of the compressor 20, which is advantageous for increasing the success rate of starting the compressor 20.

Example four,

after 5 seconds, the control system of the air conditioner 100 controls the valve body 2 to move rightward from the fourth position (shown in fig. 14) to the first position (shown in fig. 13), so that the first port 101 communicates with the port of the four-way valve 10 connected to the high-pressure side heat exchanger. Accordingly, the refrigerant of the outdoor heat exchanger 40 is prevented from flowing back to the discharge port 201 of the compressor 20, thereby contributing to an increase in the success rate of starting the compressor 20.

When the air conditioner 100 controls the compressor 20 to start and switch to the heating mode, the valve core 2 moves to the fifth position (as shown in fig. 15) from the second position (as shown in fig. 16, the second stop surface 21b blocks the first port 101, the third stop surface 251 blocks the second port 102, the first control valve 41 is opened, the second control valve 51 is disconnected, the second port 102 is communicated with the third port 103, and the third port 103 is not communicated with the fourth port 104. during the start of the compressor 20, the return air inlet 202 of the compressor 20 can suck the refrigerant in the outdoor heat exchanger 40 to quickly increase the pressure.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An air conditioner, comprising:

a compressor having a discharge port and a return port;

the first end of the indoor heat exchanger is connected with the first end of the outdoor heat exchanger through a throttling element;

the reversing assembly is provided with a first interface to a fourth interface, the first interface is connected with the exhaust port, the second interface is connected with the second end of the outdoor heat exchanger, the third interface is connected with the air return port, and the fourth interface is connected with the second end of the indoor heat exchanger;

the reversing component is a four-way valve; the four-way valve comprises: the valve body is internally provided with a valve cavity, and the valve body is provided with the first interface to the fourth interface; the valve core is movably arranged in the valve cavity and provided with a first position to a third position, a communicating part protruding towards the inner wall of the valve cavity is arranged on the valve core, a communicating channel is arranged on the communicating part, a first chamber to a third chamber are defined by the valve core, the communicating part and the inner wall of the valve cavity, the communicating channel is communicated with the second chamber, and the third interface is communicated with the second chamber; in the first position, the first port and the second port are both in communication with the first chamber, and the fourth port is in communication with the second chamber; in the second position, the first port is communicated with the second chamber through the communication passage; in the third position, the second port is in communication with the second chamber, and the first port and the fourth port are both in communication with the third chamber;

when the compressor is stopped, the first interface is communicated with the third interface.

2. The air conditioner according to claim 1, wherein the second port is not communicated with the fourth port when the compressor is stopped.

3. The air conditioner according to claim 2, wherein the third port communicates with a port to which a low pressure side heat exchanger is connected when the compressor is stopped.

4. The air conditioner of claim 1, wherein the valve chamber has first and second opposing sidewalls, the first port is located on the first sidewall, the second through fourth ports are located on the second sidewall, the valve spool, the communication and the first sidewall define first and second sub-chambers therebetween, and the valve spool and the second sidewall define third, fourth and second sub-chambers therebetween, wherein the third and first sub-chambers are located on the same side of the second chamber and communicate to define the first chamber, and the second and fourth sub-chambers are located on the same side of the second chamber and communicate to define the third chamber.

5. The air conditioner of claim 4, wherein the valve cartridge comprises:

the first blocking block and the second blocking block are arranged at intervals in the moving direction of the valve core;

the connecting plate is connected between the first blocking block and the second blocking block, the communicating part protruding towards the direction close to the first side wall is formed on the surface of the connecting plate facing the first side wall, the communicating part, the connecting plate, the first blocking block and the first side wall define the first sub-chamber, and the communicating part, the connecting plate, the second blocking block and the first side wall define the second sub-chamber;

the first separation plate and the second separation plate are arranged on the surface, far away from the first side wall, of the connecting plate and are arranged in a spaced mode in the moving direction of the valve core, the first separation plate is located between the second separation plate and the first blocking block, the first separation plate, the second separation plate, the connecting plate and the second side wall define the second chamber, the first blocking block, the first separation plate, the connecting plate and the second side wall define the third sub-chamber, and the second separation plate, the second blocking block, the connecting plate and the second side wall define the fourth sub-chamber.

6. The air conditioner according to claim 5, wherein the first block, the second block, the connecting plate, the communication portion, the first partition plate, and the second partition plate are integrally formed.

7. The air conditioner according to claim 4, wherein the four-way valve further comprises a first connection pipe and a second connection pipe, the first connection pipe is connected to the second port and the third port, respectively, a first control valve is connected in series to the first connection pipe, the second connection pipe is connected to the third port and the fourth port, respectively, a second control valve is connected in series to the second connection pipe;

a surface of the communication portion facing the first side wall defines a first stop surface and a second stop surface spaced apart by an end of the communication channel facing the first side wall; a surface of the first divider plate facing the second side wall defines a third stop surface, a surface of the second divider plate facing the second side wall defines a fourth stop surface, and the spool has a fourth position and a fifth position;

at the fourth position, the first stop surface blocks the first port, the fourth stop surface blocks the fourth port, the first control valve is disconnected, the second control valve is opened, and the second port is not communicated with the third port;

in the fifth position, the second stop surface blocks the first port, the third stop surface blocks the second port, the first control valve is opened, the second control valve is disconnected, and the third port and the fourth port are not communicated.

8. The air conditioner of claim 1, wherein the four-way valve includes an electromagnetic control for actuating movement of the valve element.

9. The air conditioner of claim 1, wherein the throttling element is an electronic expansion valve, a thermal expansion valve, or a capillary tube.

10. A control method of an air conditioner, characterized in that the air conditioner is the air conditioner according to any one of claims 1 to 9, the control method comprising:

controlling the compressor to start, controlling the first interface and the third interface to be disconnected, and conducting the third interface and an interface of the reversing assembly, which is connected with the low-pressure side heat exchanger;

detecting the discharge pressure P1 of the compressor and the pressure P2 of the high-pressure side heat exchanger;

and when the P1 is more than or equal to P2, controlling the first interface to be communicated with the interface of the reversing assembly, which is connected with the high-pressure side heat exchanger.

11. The control method of an air conditioner according to claim 9, wherein a pressure at the first interface is detected to obtain a discharge pressure P1 of the compressor.

12. A control method of an air conditioner, characterized in that the air conditioner is the air conditioner according to any one of claims 1 to 9, the control method comprising:

and after t seconds, controlling the first interface to be communicated with the interface of the reversing assembly, which is connected with the high-pressure side heat exchanger.

13. The control method of an air conditioner according to claim 12, wherein t is 1. ltoreq. t.ltoreq.10.