WO2018121418A1

WO2018121418A1 - Expansion switching valve

Info

Publication number: WO2018121418A1
Application number: PCT/CN2017/117819
Authority: WO
Inventors: 黄健; 张小伟; 陈雪峰; 叶梅娇
Original assignee: 比亚迪股份有限公司
Priority date: 2016-12-29
Filing date: 2017-12-21
Publication date: 2018-07-05
Also published as: CN108253162A

Abstract

An expansion switching valve comprises a valve body (500). A first inlet (501a), a second inlet (501b), an outlet (502), and an internal flow path communicating the first inlet (501a), the second inlet (501b), and the outlet (502) are formed at the valve body (500). A first valve core (503) and a second valve core (504) are installed at the internal flow path. The first valve core (503) allows or blocks direct communication between the first inlet (501a) and the outlet (502). The second valve core (504) allows or blocks communication between the second inlet (501b) and the outlet (502) by means of a flow restriction hole (505). Installation of the first valve core (503) and the second valve core (504) at the internal flow path in the same valve body realizes blocking and flow control of a refrigerant or throttling expansion. The expansion switching valve has a simple structure and can be manufactured and installed easily. Applying the expansion switching valve in a heat pump system can simplify pipeline connection, lower costs, and reduce a charge of refrigerant introduced into the entire heat pump system, thereby facilitating oil return to a compressor.

Description

Expansion switch valve

Cross-reference to related applications

The present application claims priority to Chinese Patent Application No. 20161124647, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present disclosure relates to the field of control valves and, in particular, to an expansion switch valve.

Background technique

In a heat pump system, it is sometimes necessary to control the refrigerant to reduce the pressure or to reduce the flow only, and the existing electronic expansion valve can only control the refrigerant to throttle or not. In order to meet this demand of the heat pump system, the prior art uses a structure in which an electronic expansion valve and an electromagnetic switching valve are connected in parallel. This structure requires two three-way joints and six pipelines, which are complicated in structure and inconvenient to install. When the solenoid valve is closed and the electronic expansion valve is used, the electronic expansion valve inlet is a medium-temperature high-pressure liquid refrigerant, and the electronic expansion valve outlet is a low-temperature low-pressure liquid refrigerant. Since the pipeline is connected, the inlet and outlet of the solenoid valve are also respectively The state of the refrigerant in the inlet and outlet of the electronic expansion valve is the same, and the refrigerant pressure at the inlet and outlet of the solenoid valve is different, which easily causes damage to the internal structure of the solenoid valve. In addition, due to the relatively large number of pipes, the refrigerant charge of the entire heat pump system is increased and the cost is increased. When the heat pump system is operated at low temperatures, it is difficult to return the oil to the compressor. This complicated structure is also detrimental to the oil return of the heat pump system.

Summary of the invention

It is an object of the present disclosure to provide an expansion switch valve that is capable of both on-off control and throttling control through a medium, and has a simple structure.

In order to achieve the above object, the present disclosure provides an expansion switch valve including a valve body, wherein the valve body is formed with a first inlet, a second inlet, an outlet, and a communication at the first inlet, the second inlet, and An inner flow passage between the outlets, wherein the inner flow passage is mounted with a first valve core and a second valve core, the first valve core directly connecting or disconnecting the first inlet and the outlet, The second spool causes the second inlet and the outlet to communicate or disconnect through the orifice.

Optionally, the internal flow passage includes a first flow passage communicating with the first inlet and a second flow passage communicating with the second inlet, and the first flow passage is formed with a first valve core a valve port formed on the second flow path to form a second valve port that cooperates with the second valve body, the first flow path and the second flow path meet at the Downstream of the second valve port and in communication with the outlet.

Optionally, the first spool and the second spool are parallel to each other.

Optionally, the second flow channel and the outlet are perpendicular to each other, the first flow path is formed as a first through hole parallel to the second flow path, and the second inlet is opened in the first A second through hole on the sidewall of the second flow path is in communication with the second flow path, and the first through hole and the second through hole communicate with the first inlet and the second inlet, respectively.

Optionally, the first through hole and the second flow path are respectively communicated with the outlet through a third through hole and a fourth through hole, and the third through hole and the fourth through hole are coaxial and open to each other And perpendicular to the exit.

Optionally, the first inlet and the second inlet are parallel to each other on the same side of the valve body, and the outlets are parallel to the first inlet and the second inlet, respectively.

Optionally, the outlet is disposed between the first spool and the second spool.

Optionally, the first spool is coaxially disposed with the first valve port in a moving direction to selectively block or disengage the first valve port.

Optionally, the second spool is coaxially disposed with the second valve port in a moving direction to selectively block or disengage the second valve port.

Optionally, the first valve core includes a first valve stem and a first plug connected to an end of the first valve stem, the first plug is used for sealing against an end surface of the first valve port Upper to block the first flow path.

Optionally, the second valve core includes a second valve stem, the end of the second valve stem is formed as a conical head structure, and the second valve port is formed into a tapered shape matching the conical head structure Hole structure.

Optionally, the valve body includes a valve seat formed with the internal flow passage and a first valve housing and a second valve housing mounted on the valve seat, and the first valve housing is mounted for driving the a first electromagnetic driving portion of the first valve body, a second electromagnetic driving portion for driving the second valve core is mounted in the second valve housing, the first valve core extending from the first valve housing to The inner flow passage in the valve seat, the second spool extending from the second valve housing to the inner flow passage in the valve seat.

Optionally, the valve seat is formed in a polyhedral structure, the first valve housing and the second valve housing are disposed on the same surface of the polyhedral structure, and the first inlet and the second inlet are disposed at the same On the same surface of the polyhedral structure, and the first valve housing, the first inlet and the outlet are respectively disposed on different surfaces of the polyhedral structure, wherein the first valve housing and the second valve housing The mounting directions are parallel to each other, and the opening directions of the inlet and the outlet are parallel to each other.

According to the above technical solution, the on-off control or the throttling expansion control of the refrigerant can be realized by integrally installing the first valve core and the second valve core on the internal flow passage of the same valve body having the first inlet, the second inlet and the outlet. The function is simple in structure, easy to manufacture and install, and when the expansion switch valve provided by the present disclosure is applied to a heat pump system, the pipe connection can be simplified, the cost can be simplified, and the refrigerant charge of the entire heat pump system can be reduced, and the compressor can be returned to the oil. .

Other features and advantages of the present disclosure will be described in detail in the detailed description which follows.

DRAWINGS

The drawings are intended to provide a further understanding of the disclosure, and are in the In the drawing:

1 is a perspective structural view of an expansion switch valve in one direction according to an exemplary embodiment of the present disclosure;

2 is a perspective structural view of the expansion switch valve in another direction according to an exemplary embodiment of the present disclosure;

3 is a cross-sectional structural view of an expansion switch valve according to an exemplary embodiment of the present disclosure, wherein a first valve port is in an open state and a second valve port is in a closed state;

4 is another schematic cross-sectional structural view of an expansion switch valve according to an exemplary embodiment of the present disclosure, wherein a first valve port is in a closed state and a second valve port is in an open state;

FIG. 5 is a first internal structural diagram of an expansion switch valve according to an exemplary embodiment of the present disclosure, wherein a first valve port is in an open state;

6 is a second internal structural diagram of an expansion switch valve provided in accordance with an exemplary embodiment of the present disclosure, wherein the second valve port is in an open state.

Reference mark:

500 valve body 501a first import 502 exit

503 first valve plug 513 first valve stem 523 first plug

504 second spool 514 second stem 505 throttle

506 first flow passage 516 first valve port 526 first through hole

507 second flow passage 517 second valve port 527 second through hole

510 valve seat 511 first valve housing 521 first electromagnetic drive

512 second valve housing 522 second electromagnetic driving portion 501b second inlet

508 third through hole 509 fourth through hole

detailed description

The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are not to be construed

In the present disclosure, the orientation words used, such as "up, down, left, and right", are generally relative to the drawing direction of the drawing, and the "upstream, downstream" is relative to The medium, for example, in the flow direction of the refrigerant, specifically, the flow direction toward the refrigerant is downstream, and the flow direction away from the refrigerant is upstream, and "inside and outside" means the inside and outside of the contour of the corresponding member.

As shown in FIG. 1 to FIG. 6, the present disclosure provides an expansion switch valve including a valve body 500, wherein the valve body 500 is formed with a first inlet 501a, a second inlet 501b, an outlet 502, and a first connection therebetween. An inner flow passage between the inlet 501a, the second inlet 501b and the outlet 502, the first spool 503 and the second spool 504 are mounted on the inner flow passage, and the first spool 503 directly connects the first inlet 501a and the outlet 502 or Disconnected, the second spool 504 causes the second inlet 501b and the outlet 502 to communicate or disconnect through the orifice 505.

Wherein, the "direct communication" achieved by the first valve body 503 means that the coolant entering from the first inlet 501a of the valve body 500 can pass over the first valve body 503 and flow directly to the valve through the internal flow passage without being throttled. The outlet 502 of the body 500, the "disconnected communication" achieved by the first spool 503 means that the coolant entering from the first inlet 501a of the valve body 500 cannot pass over the first spool 503 and cannot flow through the internal flow passage to the valve body. Exit 502 of 500. The "connected through the orifice" realized by the second spool 504 means that the coolant entering from the second inlet 501b of the valve body 500 can flow over the second spool 504 and flow through the orifice to the valve body. The outlet 502 of 500, and the "disconnected communication" achieved by the second spool 504 means that the coolant entering from the second inlet 501b of the valve body 500 cannot pass over the second spool 504 and cannot flow through the orifice 505. The outlet 502 of the valve body 500.

In other words, the expansion switch valve has at least a first working position, a second working position and a third working position. In the first working position, the first spool 503 directly connects the first inlet 501a and the outlet 502, and the second spool 504 causes the second inlet 501b and the outlet 502 to be in communication communication; in the second working position, the first spool 503 disconnects the first inlet 501a from the outlet 502, and the second spool 504 causes the second inlet 501b and the outlet 502 Through the orifice 505, in the third working position, the first spool 503 disconnects the first inlet 501a from the outlet 502, and the second spool 504 disconnects the second inlet 501b and the outlet 502.

Thus, by controlling the first spool 503 and the second spool 504, the expansion switch valve of the present disclosure can cause the coolant entering from the first inlet 501a and the second inlet 501b to achieve at least three states. That is, 1) an off state; 2) a direct communication state over the first valve body 503; and 3) a throttle communication mode over the second valve body 504.

Wherein, the high temperature and high pressure liquid refrigerant can be a low temperature and low pressure mist-like hydraulic refrigerant after being throttled by the orifice 505, thereby creating conditions for the evaporation of the refrigerant, that is, the cross-sectional area of the orifice 505 is smaller than the first The cross-sectional area of each of the inlet 501a, the second inlet 501b and the outlet 502, and the opening degree of the orifice 505 can be adjusted by controlling the second spool to control the flow rate through the orifice 505 to prevent refrigerant Insufficient cooling caused by too little, and prevention of liquid hammering of the compressor due to excessive refrigerant. That is, the cooperation of the second spool 504 and the valve body 500 can cause the expansion switch valve to function as an expansion valve.

Thus, by mounting the first spool 503 and the second spool 504 on the internal flow passage of the same valve body 500 having the first inlet 501a, the second inlet 501b, and the outlet 502, between the first inlet 501a and the outlet 502 is achieved. The on-off control or the throttling control between the second inlet 501b and the outlet 502 is simple in structure, easy to manufacture and install, and when the expansion switch valve provided by the present disclosure is applied to the heat pump system, the pipe connection can be simplified, and the entire heat pump can be reduced. The refrigerant charge of the system reduces the cost and is more conducive to the oil return of the heat pump system.

As an exemplary internal mounting structure of the valve body 500, as shown in FIGS. 1 to 6, the valve body 500 includes a valve seat 510 formed with an internal flow passage and a first valve housing 511 mounted on the valve seat 510. And a second valve housing 512, a first electromagnetic driving portion 521 for driving the first valve core 503 is mounted in the first valve housing 511, and a second electromagnetic driving for driving the second valve core 504 is mounted in the second valve housing 512. Portion 522, the first spool 503 extends from the first valve housing 511 to the internal flow passage in the valve seat 510, and the second spool 504 extends from the second valve housing 512 to the internal flow passage in the valve seat 510.

Wherein, the control of the on/off power of the first electromagnetic driving portion 521 (for example, the electromagnetic coil) can conveniently control the position of the first valve core 503 in the internal flow path, thereby controlling the first inlet 501a and the outlet 502 to directly communicate or disconnect. Open communication; by controlling the on/off of the second electromagnetic driving portion 522 (for example, an electromagnetic coil), the position of the second spool 504 in the internal flow path can be conveniently controlled, thereby controlling whether the second inlet 501b and the outlet 502 are connected to the section. The flow holes 505 are in communication. In other words, it can be understood that the electronic expansion valve and the solenoid valve are integrally arranged in parallel in the valve body 500, thereby enabling automatic control of the on/off and/or throttling of the expansion switch valve and simplifying the course of the pipe.

In order to make full use of the spatial position of the expansion switch valve in various directions, to avoid interference between the expansion switch valve and different pipe connections, the valve seat 510 is formed into a polyhedral structure, and the first valve casing 511 and the second valve casing 512 are disposed in the polyhedral structure. On the same surface, the first inlet 501a and the second inlet 501b are disposed on the same surface of the polyhedral structure, and the first valve housing 511, the first inlet 501a and the outlet 502 are respectively disposed on different surfaces of the polyhedral structure, wherein The mounting directions of the first valve housing 511 and the second valve housing 512 are parallel to each other, and the opening directions of the first inlet 501a and the outlet 502 are parallel to each other. In this way, the inlet and outlet pipes can be connected to different surfaces of the polyhedral structure, which can avoid the problem of messy and entangled pipe arrangement.

As shown in FIG. 3 to FIG. 6, the internal flow passage includes a first flow passage 506 communicating with the first inlet 501a and a second flow passage 507 communicating with the second inlet 501b. The first flow passage 506 is formed with the first spool 503 mating first valve port 516, an orifice 505 is formed on the second flow passage 507 to form a second valve port 517 that cooperates with the second valve core 504, and the first flow passage 506 and the second flow passage 507 meet Downstream of the second valve port 517 and in communication with the outlet 502.

That is, the closing or opening of the first valve port 516 is achieved by changing the position of the first valve core 503 at the internal flow path, thereby controlling the cutting or conduction of the first flow path 506 connecting the first inlet 501a and the outlet 502, thereby The function of communicating or disconnecting the solenoid valve described above can be achieved. Similarly, the closing or opening of the second valve port 517 is achieved by changing the position of the second spool 504 at the internal flow passage, thereby controlling the cutting or conduction of the second flow passage 507 communicating the second inlet 501b and the outlet 522. Thus, the throttling function of the electronic expansion valve can be achieved.

The first flow passage 506 can communicate with the first inlet 501a and the outlet 502 in any suitable arrangement, and the second flow passage 507 can communicate with the second inlet 501b and the outlet 502 in any suitable arrangement to reduce the overall footprint of the valve body. As shown in FIG. 3 and FIG. 4, the second flow path 507 and the outlet 502 are perpendicular to each other, the first flow path 506 is formed as a first through hole 526 parallel to the second flow path 507, and the second inlet 501b is opened in the second The second through hole 527 on the side wall of the flow path 507 is in communication with the second flow path 507, and the first through hole 526 and the second through hole 527 are in communication with the first inlet 501a and the second inlet 501b, respectively.

To minimize the total length of the inner flow passage, as shown in FIGS. 3 and 4, the first through hole 526 and the second flow passage 507 communicate with the outlet 502 through the third through hole 508 and the fourth through hole 509, respectively. The third through hole 508 and the fourth through hole 509 are coaxial and open to each other and perpendicular to the outlet 502. In this way, it is possible to ensure that the total length of the internal flow path in the valve body 500 is the shortest, thereby ensuring that the refrigerant can flow rapidly through the expansion switching valve.

In order to facilitate the connection of the first inlet, the second inlet and the outlet of the valve body 500 to the pipe joints of different pipelines, as shown in FIGS. 1 to 6, the first inlet 501a and the second inlet 501b are opened in parallel with each other in the valve body. On the same side of the 500, the outlet 502 is parallel to the first inlet 501a and the second inlet 501b, respectively. Thus, the pipe joints of the pipes located upstream and downstream of the valve body 500 can be respectively attached to the opposite sides of the valve body 500, thereby preventing the messy and entangled conditions of the different pipe arrangements.

Further, to minimize the total length of the internal flow passage, as shown in FIGS. 3 and 4, the outlet 502 is disposed between the first spool 503 and the second spool 504.

It should be noted that the outlet 502 here is disposed between the first spool 503 and the second spool 504, indicating the projection of the outlet 502 on a plane composed of the first spool 503 and the second spool 504. Between the first spool 503 and the second spool 504.

The first spool 503 and the second spool 504 may be disposed at any suitable angle. In an exemplary embodiment, for ease of arrangement, as shown in Figures 3 and 4, the first spool 503 and the second The spools 504 are parallel to each other.

As shown in FIGS. 3 and 4, in order to facilitate the closing and opening of the first valve port 516, the first valve core 503 is coaxially disposed with the first valve port 516 in the moving direction to selectively block or disengage the first valve. Port 516.

To facilitate the closing and opening of the second valve port 517, as shown in FIGS. 3 and 4, the second valve core 504 is coaxially disposed with the second valve port 517 in the moving direction to selectively block or disengage the second valve. Port 517.

Further, as shown in FIG. 5, in order to ensure the reliability of the first valve core 503 blocking the first flow passage 506, the first valve core 503 may include a first valve stem 513 and an end connected to the end of the first valve stem 513. The first plug 523 is used for sealing against the end surface of the first valve port 516 to block the first flow passage 506.

In order to facilitate adjustment of the opening degree of the orifice 505 of the expansion switch valve, as shown in FIG. 6, the second valve core 504 includes a second valve stem 514, and the end of the second valve stem 514 is formed into a tapered head structure. The second valve port 517 is formed as a tapered hole structure that cooperates with the tapered head structure.

The opening of the orifice 505 of the expansion switch valve can be adjusted by the up and down movement of the second valve core 504, and the up and down movement of the second valve core 504 can be adjusted by the second electromagnetic driving portion 522. If the opening of the orifice 505 of the expansion switch valve is zero, as shown in FIG. 3, the second spool 504 is at the lowest position, and the second spool 504 blocks the second valve port 517, and the refrigerant is completely unable to pass the throttle. The hole 505, that is, the second valve port 517; if the expansion switch valve orifice 505 has an opening degree, as shown in FIG. 4, there is a gap between the tapered head structure of the end portion of the second valve body 504 and the orifice 505 After the refrigerant is throttled, it flows to the outlet 502. If it is required to increase the throttle opening degree of the expansion switch valve, the second solenoid 504 can be moved upward by controlling the second electromagnetic driving portion 522 to move the tapered head structure away from the orifice 505, thereby realizing the orifice 505. The opening degree becomes larger; on the contrary, when it is required to reduce the opening degree of the orifice 505 of the expansion switching valve, the second valve body 504 is driven to move downward.

In use, when only the direct communication function of the expansion switch valve is required, that is, when the expansion switch valve is located at the first working position described above, as shown in FIGS. 3 and 5, the first electromagnetic drive portion 521 is powered off, first The first plug 523 of the valve core 503 is separated from the first valve port 516, the first valve port 516 is in an open state; the second electromagnetic drive portion 522 is energized, the second valve core 504 is at the lowest position, and the second valve core 504 is blocked. The flow hole 505, the refrigerant cannot flow from the second inlet 501b through the second flow path 507 to the outlet 502, and can only flow from the first inlet 501a through the first valve port 516, the first through hole 526, and the third through hole 508 to Exit 502.

It should be noted that the dotted line with arrows in FIGS. 3 and 5 represents the circulation route and the direction of the refrigerant when the direct communication function is used.

When only the throttle communication function of the expansion switch valve is required, that is, when the expansion switch valve is located at the second working position as described above, as shown in FIGS. 4 and 6, the first electromagnetic drive portion 521 is energized, and the first valve body 503 is The first plug 523 blocks the first valve port 516, the first valve port 516 is in a closed state; the second electromagnetic driving portion 522 is powered off, the second valve core 504 is at the highest position, and the second valve core 504 is out of the throttle hole. 505, the refrigerant cannot flow from the first inlet 501a through the first flow passage 506 to the outlet 502, and can only flow from the second inlet 501b through the second through hole 527, the orifice 505 and the fourth through hole 509 to the outlet 502. And the size of the opening of the orifice 505 can be adjusted by moving the second spool 504 up and down.

It should be noted that the dotted line with arrows in FIGS. 4 and 6 represents the circulation route and the tendency of the refrigerant when the throttle communication function is used.

When the direct communication function and the throttle communication function of the expansion switch valve are not required to be used at the same time, that is, when the expansion switch valve is located at the third working position described above, the first electromagnetic drive portion 521 is energized, and the first plug of the first valve body 503 is blocked. The head 523 blocks the first valve port 516, the first valve port 516 is in a closed state; the second electromagnetic driving portion 522 is energized, the second valve core 504 is at the lowest position, and the second valve core 504 blocks the throttle hole 505, the refrigerant Neither the first inlet 501a nor the second inlet 501b can flow to the outlet 502, that is, the internal flow passage is in an off state.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solutions of the present disclosure within the scope of the technical idea of the present disclosure. These simple variations are all within the scope of the disclosure.

It should be further noted that the specific technical features described in the above specific embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure is applicable to various possibilities. The combination method will not be described separately.

In addition, any combination of various embodiments of the present disclosure may be made as long as it does not deviate from the idea of the present disclosure, and should also be regarded as the disclosure of the present disclosure.

Claims

An expansion switch valve includes a valve body (500), wherein the valve body (500) is formed with a first inlet (501a), a second inlet (501b), an outlet (502), and a communication body An internal flow passage between an inlet (501a), the second inlet (501b) and the outlet (502), the inner spool is provided with a first spool (503) and a second spool (504) The first spool (503) causes the first inlet (501a) and the outlet (502) to communicate directly or disconnected, and the second spool (504) causes the second inlet (501b) And the outlet (502) communicates or disconnects through the orifice (505).
The expansion switch valve according to claim 1, wherein said internal flow passage includes a first flow passage (506) communicating with said first inlet (501a) and communicating with said second inlet (501b) a second flow path (507), the first flow path (506) is formed with a first valve port (516) that cooperates with the first valve body (503), and the throttle hole (505) is formed in the second flow path (506) a second valve port (517) formed on the second flow path (507) to cooperate with the second valve body (504), the first flow path (506) and the second flow path (507) Converging downstream of the second valve port (517) and in communication with the outlet (502).
The expansion switch valve according to claim 2, wherein the first spool (503) and the second spool (504) are parallel to each other.
The expansion switch valve according to claim 2, wherein said second flow path (507) and said outlet (502) are perpendicular to each other, and said first flow path (506) is formed to be opposite said second flow a first through hole (526) parallel to each other (507), the second inlet (501b) passing through a second through hole (527) opened on a sidewall of the second flow path (507) and the first The second flow path (507) is in communication, and the first through hole (526) and the second through hole (527) are in communication with the first inlet (501a) and the second inlet (501b), respectively.
The expansion switch valve according to claim 4, wherein the first through hole (526) and the second flow path (507) pass through the third through hole (508) and the fourth through hole (509), respectively. And communicating with the outlet (502), the third through hole (508) and the fourth through hole (509) are coaxial and open to each other, and perpendicular to the outlet (502).
The expansion switch valve according to any one of claims 1 to 5, characterized in that the first inlet (501a) and the second inlet (501b) are opened in parallel with each other in the valve body (500) On the side, the outlets (502) are parallel to the first inlet (501a) and the second inlet (501b), respectively.
The expansion switch valve of claim 6 wherein said outlet (502) is disposed between said first spool (503) and said second spool (504).
The expansion switch valve according to any one of claims 2 to 5, wherein the first valve body (503) is coaxially disposed with the first valve port (516) in a moving direction to selectively The first valve port (516) is blocked or disengaged.
The expansion switch valve according to any one of claims 2 to 5, wherein the second valve core (504) is coaxially disposed with the second valve port (517) in a moving direction to selectively The second valve port (517) is blocked or disengaged.
The expansion switch valve according to claim 8, wherein said first valve body (503) includes a first valve stem (513) and a first plug attached to an end of said first valve stem (513) (523), the first plug (523) is for sealing against the end face of the first valve port (516) to block the first flow path (506).
The expansion switch valve according to claim 9, wherein said second valve body (504) includes a second valve stem (514), and an end of the second valve stem (514) is formed into a tapered head structure The second valve port (517) is formed into a tapered hole structure that cooperates with the tapered head structure.
The expansion switch valve according to claim 1, wherein said valve body (500) includes a valve seat (510) formed with said internal flow passage and a first valve mounted on said valve seat (510) a casing (511) and a second valve casing (512), wherein the first valve casing (511) is mounted with a first electromagnetic driving portion (521) for driving the first valve core (503), the second A second electromagnetic driving portion (522) for driving the second valve body (504) is mounted in the valve housing (512), and the first valve core (503) extends from the first valve housing (511) to The inner flow passage in the valve seat (510), the second valve core (504) extends from the second valve housing (512) to the inner flow passage in the valve seat (510) .
The expansion switch valve according to claim 12, wherein said valve seat (510) is formed in a polyhedral structure, and said first valve housing (511) and said second valve housing (512) are disposed in said polyhedron On the same surface of the structure, the first inlet (501a) and the second inlet (501b) are disposed on the same surface of the polyhedral structure, and the first valve casing (511), the first inlet ( 501a) and the outlet (502) are respectively disposed on different surfaces of the polyhedral structure, wherein a mounting direction of the first valve casing (511) and the second valve casing (512) are parallel to each other, the The opening directions of an inlet (501a) and the outlet (502) are parallel to each other.