Electric valve

Abstract

A valve body assembly comprises a valve seat, a valve port piece, a first connecting pipe and a second connecting pipe, a valve port is formed in the valve port piece, the valve seat is provided with a valve cavity, the valve port piece is arranged in the valve cavity, the first connecting pipe is communicated with the valve cavity from the circumferential side of the valve seat through the valve port, and the second connecting pipe is directly communicated with the valve cavity from the circumferential side of the valve seat; the transmission assembly comprises a screw rod and a threaded sleeve, the screw rod penetrates through the threaded sleeve and is in threaded connection with the threaded sleeve, and one of the screw rod and the threaded sleeve is connected with the valve element and used for driving the valve element to move axially. The electrically operated valve provided by the utility model has low requirements on mounting space, can realize two-way circulation, and is low in noise during use.

Description

Technical Field

[0001] The present application relates to the technical field of switch valves, and in particular to an electric valve. Background Art

[0002] At present, the electric valve mainly includes a valve body, a valve core, a transmission member, an inlet pipe and an outlet pipe, wherein the inlet pipe is directly connected to the side wall of the valve body, a valve port is formed at one end of the valve body along the axial direction, and the outlet pipe is inserted into the valve port. The transmission member is used to drive the valve core to move in the valve body to close the valve port to separate the inlet pipe and the outlet pipe; or to open the valve port to connect the inlet pipe with the outlet pipe. In this way, it is necessary to reserve space on the side of the valve body and one end along the axial direction to arrange the inlet pipe and the outlet pipe respectively, so that the electric valve has a relatively high requirement for the installation space.

[0003] In addition, the common transmission part is configured in a manner that the moving iron core and the static iron core are attracted to each other, wherein the static iron core is fixedly connected to the valve body, and the static iron core and the moving iron core are connected by a spring. When the coil is energized, the moving iron core overcomes the spring force under the action of magnetic attraction and moves toward the static iron core to open the valve port; when the coil is de-energized, the magnetic force between the moving iron core and the static iron core disappears, and the moving iron core moves toward the valve port to close the valve port under the action of the spring force and its own gravity. However, due to the instantaneous attraction of the static iron core and the moving iron core at the moment the coil is energized, a large attraction noise will be generated. At the same time, the valve port is instantly opened, the inlet pipe and the outlet pipe are instantly connected, and the fluid flow rate is fast, thereby generating relatively large fluid noise. Since the moving iron core relies on the spring force and its own gravity to close the valve port, if the fluid pressure at the outlet pipe is greater than that at the inlet pipe, the moving iron core will be pushed open by the fluid under the action of the pressure difference, and the valve port will open accidentally. Therefore, this electric valve can only be used to make the fluid flow from the inlet pipe to the outlet pipe, but cannot make the fluid flow from the outlet pipe to the inlet pipe, that is, the above electric valve cannot be used in occasions requiring two-way flow. Utility Model Content

[0004] Based on this, it is necessary to provide an electric valve to solve the problems that conventional electric valves have high requirements for installation space, cannot achieve two-way flow, and have high noise during use.

[0005] The present application provides an electric valve, including a valve body assembly, a transmission assembly and a valve core, wherein the valve body assembly has a valve port, the valve core is movably mounted on the valve body assembly, and the transmission assembly is used to drive the valve core to move toward or away from the valve port to close or open the valve port. The valve body assembly includes a valve seat, a valve port member, a first connecting pipe and a second connecting pipe, the valve port is opened in the valve port member, the valve seat has a valve cavity, the valve port member is mounted in the valve cavity, the first connecting pipe is connected to the valve cavity from the periphery of the valve seat through the valve port, and the second connecting pipe is directly connected to the valve cavity from the periphery of the valve seat; the transmission assembly includes a screw and a threaded sleeve, the screw is passed through the threaded sleeve and is threadedly connected to the threaded sleeve, wherein one of the screw and the threaded sleeve is connected to the valve core and is used to drive the valve core to move axially.

[0006] In one embodiment, the first connecting pipe and the second connecting pipe are coaxially arranged.

[0007] In one of the embodiments, the valve port is coaxially arranged with the valve core, and an interface is provided on the side wall of the valve port member, the interface is communicated with the valve port, and is used for installing the first connecting pipe.

[0008] In one embodiment, a matching surface is formed on the inner wall of the valve port, the matching surface is configured as a conical surface, and the radius of the matching surface tends to decrease along the direction from the valve core to the valve port member.

[0009] In one embodiment, the threaded sleeve is fixedly connected to the valve body assembly, and the valve core is connected to the screw rod. As the screw rod rotates circumferentially, the screw rod can drive the valve core to move axially.

[0010] In one of the embodiments, the valve body assembly also includes a guide sleeve, which is connected to one end of the valve seat and forms a valve cavity between the guide sleeve and the valve seat, and a movable seal is formed between the outer wall of the valve core and the inner wall of the guide sleeve. The threaded sleeve is arranged at the end of the guide sleeve away from the valve cavity, and the threaded sleeve is fixedly connected to the valve seat; and / or the threaded sleeve is fixedly connected to the guide sleeve.

[0011] In one of the embodiments, a stop step is formed on the inner wall of the valve seat, the guide sleeve is disposed on the stop step, and the outer wall of the guide sleeve is interference fit with the inner wall of the stop step.

[0012] In one embodiment, a positioning groove is formed on the bottom wall of the valve cavity, and the valve mouth piece is installed in the positioning groove; or, the valve mouth piece and the valve seat are integrally formed.

[0013] In one embodiment, the positioning groove is coaxially arranged with the stop step.

[0014] In one embodiment, the valve core is provided with a balancing channel, which runs through one end of the valve core close to the valve port and one end away from the valve port. When the valve core moves to close the valve port, the balancing channel is connected to the first connecting pipe.

[0015] Compared with the prior art, the electric valve provided by the present application, since the first connecting pipe and the second connecting pipe are connected to the valve cavity from the peripheral side of the valve seat respectively, therefore, in the process of installing the electric valve, it is only necessary to consider reserving space on the peripheral side of the valve seat to arrange the first connecting pipe and the second connecting pipe, and there is no need to reserve space at one end of the valve seat along the axial direction, thereby reducing the requirements of the electric valve for installation space. In addition, during the cooperation between the threaded sleeve and the movable thread of the screw, one plays a guiding and limiting role in the axial movement of the other, so that the screw or the threaded sleeve can drive the valve core to move more smoothly and slowly to slowly open or close the valve port. Therefore, compared with the method of using the static iron core and the moving iron core to attract each other in the related structure, the electric valve provided by the present application can avoid the attraction noise generated by the attraction between the moving iron core and the static iron core when opening the valve, and can also avoid the instantaneous increase in the fluid velocity caused by the instantaneous opening of the valve port, thereby generating relatively large fluid noise. Since the screw or threaded sleeve can only move axially relative to the other when subjected to circumferential force, when the valve core moves to close the valve mouth, even if the fluid pressure at the first connecting pipe is greater than the pressure in the valve cavity and the second connecting pipe, the fluid exerts an axial force on the valve core directed toward the screw, and cannot push the valve core to move in the direction away from the valve mouth. Therefore, the first connecting pipe can be used as an inlet pipe or an outlet pipe, and correspondingly, the second connecting pipe can be used as an outlet pipe or an inlet pipe. That is, the electric valve provided in the present application can achieve two-way circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A cross-sectional view of the electric valve provided for this application;

[0018] Figure 2 A cross-sectional view of a valve seat assembly according to an embodiment of the present application;

[0019] Figure 3 A cross-sectional view of a valve seat assembly according to another embodiment of the present application.

[0020] Figure numerals: 10, valve body assembly; 11, valve seat; 111, valve cavity; 112, stop step; 113, first through hole; 114, second through hole; 115, positioning groove; 12, valve mouth piece; 121, valve mouth; 122, interface; 123, mating surface; 13, first connecting pipe; 14, second connecting pipe; 15, guide sleeve; 16, sleeve; 161, rotor cavity; 20, transmission assembly; 21, screw; 22, threaded sleeve; 23, rotor; 30, valve core; 31, balance channel. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0022] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0024] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0026] See also Figure 1 The present application provides an electric valve, which includes a valve body assembly 10, a transmission assembly 20 and a valve core 30. The valve body assembly 10 has a valve port 121, and the valve core 30 is movably mounted on the valve body assembly 10. The transmission assembly 20 is used to drive the valve core 30 to move toward or away from the valve port 121 to close or open the valve port 121. Among them, the valve body assembly 10 includes a valve seat 11, a valve port member 12, a first connecting pipe 13 and a second connecting pipe 14. The valve port 121 is opened in the valve port member 12, the valve seat 11 has a valve cavity 111, the valve port member 12 is mounted in the valve cavity 111, the first connecting pipe 13 is connected to the valve cavity 111 from the periphery of the valve seat 11 through the valve port 121, and the second connecting pipe 14 is directly connected to the valve cavity 111 from the periphery of the valve seat 11. The transmission assembly 20 includes a screw 21 and a threaded sleeve 22. The screw 21 is inserted into the threaded sleeve 22 and threadedly connected to the threaded sleeve 22. One of the screw 21 and the threaded sleeve 22 is connected to the valve core 30 and is used to drive the valve core 30 to move axially.

[0027] Since the first connecting pipe 13 and the second connecting pipe 14 are connected to the valve cavity 111 from the peripheral side of the valve seat 11, during the installation of the electric valve, it is only necessary to consider reserving space on the peripheral side of the valve seat 11 to arrange the first connecting pipe 13 and the second connecting pipe 14, without reserving space at one end of the valve seat 11 along the axial direction, thereby reducing the requirements of the electric valve for the installation space. In addition, during the process of the threaded sleeve 22 and the screw 21 movable thread matching, one plays a guiding and limiting role in the axial movement of the other, so that the screw 21 or the threaded sleeve 22 can drive the valve core 30 to move more steadily and slowly to slowly open or close the valve port 12. Therefore, compared with the method of using the static iron core and the moving iron core to attract each other in the related structure, the electric valve provided in the present application can avoid the attraction noise generated by the attraction of the moving iron core and the static iron core when opening the valve, and can also avoid the instantaneous increase of the fluid speed caused by the instantaneous opening of the valve port 121, thereby generating a relatively large fluid noise. Since the screw 21 or the threaded sleeve 22 can only move axially relative to the other when subjected to circumferential force, when the valve core 30 moves to close the valve mouth 12, even if the fluid pressure at the first connecting pipe 13 is greater than the pressure at the valve cavity 111 and the second connecting pipe 14, the fluid exerts an axial force on the valve core 30 directed toward the screw 21, and cannot push the valve core 30 to move in a direction away from the valve mouth 12. Therefore, the first connecting pipe 13 can be used as an inlet pipe or an outlet pipe, and correspondingly, the second connecting pipe 14 can be used as an outlet pipe or an inlet pipe. That is, the electric valve provided in the present application can achieve two-way flow.

[0028] There are two forms of the way in which the threaded sleeve 22 and the active thread of the screw rod 21 drive the valve core 30 to move axially, one of which is as follows: Figure 1 As shown, the threaded sleeve 22 is fixedly connected to the valve body assembly 10, and the valve core 30 is connected to the screw 21. As the screw 21 rotates circumferentially, the screw 21 can drive the valve core 30 to move axially; another is that the screw 21 is limited in the axial direction to the valve body assembly 10, the threaded sleeve 22 is limited in the circumferential direction to the valve body assembly 10, the valve core 30 is connected to the threaded sleeve 22, and as the screw 21 rotates circumferentially, the threaded sleeve 22 can drive the valve core 30 to move axially. The following takes the threaded sleeve 22 fixedly connected to the valve body assembly 10, the valve core 30 connected to the screw 21, and as the screw 21 rotates circumferentially, the screw 21 can drive the valve core 30 to move axially as an example to introduce the process of the transmission assembly 20 driving the valve core 30 to move.

[0029] like Figure 1 As shown, further, the first connecting pipe 13 and the second connecting pipe 14 are coaxially arranged, so that the through hole on the valve seat 11 connected with the first connecting pipe 13 and the second connecting pipe 14 is coaxially arranged, which facilitates the processing of the through hole on the valve seat 11.

[0030] Specifically, Figure 2As shown, a first through hole 113 and a second through hole 114 are provided on the side wall of the valve seat 11 , and the first through hole 113 and the second through hole 114 are coaxially arranged. The first through hole 113 is used to install the first connecting pipe 13 , and the second through hole 114 is used to install the second connecting pipe 14 .

[0031] like Figure 1 As shown, the valve port 121 is coaxially arranged with the valve core 30, and an interface 122 is provided on the side wall of the valve port member 12, which is in communication with the valve port 121 and is used to install the first connecting pipe 13. The interface 122 is coaxially arranged with the first through hole 113 and is directly opposite to each other. In this way, the structure of the valve port member 12 is simple, and after the first connecting pipe 13 is connected to the interface 122, the valve core 30 can realize the connection or isolation of the first connecting pipe 13 and the second connecting pipe 14 by opening or closing the valve port 121.

[0032] Furthermore, if Figure 1 and Figure 2 As shown, the inner wall of the valve port 121 is provided with a mating surface 123, which is configured as a conical surface, and the radius of the mating surface 123 tends to decrease along the direction from the valve core 30 to the valve port member 12. In this way, when the outer edge of the valve core 30 abuts against the conical surface, the conical surface can simultaneously provide radial and axial support forces for the valve core 30, so that the valve core 30 can firmly close the valve port. In addition, by adjusting the depth of the valve core 30 extending into the valve port 121, the size of the opening of the valve port 121 can be adjusted, so that the flow rate can be adjusted.

[0033] Optionally, in one embodiment, if Figure 1 and Figure 2 As shown, the valve port member 12 is fixedly connected to the valve seat 11. That is, the valve port member 12 and the valve seat 11 are separately provided, the valve port member 12 and the valve seat 11 are processed separately, and then the valve port member 12 and the valve seat 11 are assembled. Specifically, the valve port member 12 and the valve seat 11 are welded.

[0034] Furthermore, a positioning groove 115 is formed on the bottom wall of the valve cavity 111, and the valve port member 12 is installed in the positioning groove 115. By forming the positioning groove 115 on the bottom wall of the valve cavity 111, the valve port member 12 can be installed at a desired position of the valve cavity 111 accurately and conveniently.

[0035] In another embodiment, if Figure 3 As shown, the valve port member 12 is integrally formed with the valve seat 11. Specifically, the valve port member 12 can be formed by grooving and drilling the valve seat 11.

[0036] like Figure 1As shown, the valve body assembly 10 also includes a guide sleeve 15, which is connected to one end of the valve seat 11, and a valve cavity 111 is formed between the guide sleeve 15 and the valve seat 11, and the outer wall of the valve core 30 and the inner wall of the guide sleeve 15 are movably sealed. The threaded sleeve 22 is arranged at the end of the guide sleeve 15 away from the valve cavity, and the threaded sleeve 22 is fixedly connected to the valve seat 11; and / or, the threaded sleeve is fixedly connected to the guide sleeve. In other words, there are three types of connection between the threaded sleeve 22, the guide sleeve 15 and the valve seat 11, one of which is that the threaded sleeve 22 is only fixed on the valve seat 11; another is that the threaded sleeve 22 is only fixed on the guide sleeve 15; the third is that the outer wall of the threaded sleeve 22 is fixed on the valve seat 11, and the inner wall of the threaded sleeve 22 is transitionally matched with the outer wall of the guide sleeve 15.

[0037] In this way, the guide sleeve 15 can not only support the threaded sleeve 22, but also guide the movement of the valve core 30, so that the screw rod 21 can drive the valve core 30 to move more stably.

[0038] Furthermore, if Figure 2 As shown, the inner wall of the valve seat 11 is provided with a stop step 112, the guide sleeve 15 is mounted on the stop step 112, and the positioning groove 115 is coaxially arranged with the stop step 112. In this way, it can be ensured that the guide sleeve 15 and the valve port member 12 are coaxially arranged, so that it can be ensured that when the valve core 30 moves along the inner wall of the guide sleeve 15, the valve port 121 can be opened or closed more accurately.

[0039] Furthermore, the outer wall of the guide sleeve 15 is interference-fitted with the inner wall of the stop step 112. In this way, the guide sleeve 15 can be prevented from deflecting, thereby facilitating further ensuring the coaxiality between the guide sleeve 15 and the valve port member 12.

[0040] Please continue reading Figure 1 The valve body assembly 10 further includes a sleeve 16, which is connected to the valve seat 11. The transmission assembly 20 further includes a rotor 23, which is movably mounted in the sleeve 16 and fixedly connected to one end of the screw 21 away from the valve port 12, so as to drive the screw 21 to rotate. The rotation of the rotor 23 drives the screw 21 to rotate, and the screw 21 is threadedly matched with the threaded sleeve 22, so as to realize the axial movement of the screw 21 relative to the threaded sleeve 22, so as to approach the valve port 12 or move away from the valve port 12.

[0041] Specifically, the sleeve 16 is connected to the valve seat 11, and a rotor cavity 161 is formed between the sleeve 16 and the valve seat 11, and the rotor 23 is located in the rotor cavity 161. One end of the screw 21 away from the valve port 12 is passed through the threaded sleeve 22 and fixedly connected to the rotor 23, and the rotor 23 can drive the screw 21 to rotate circumferentially and move axially.

[0042] like Figure 1As shown, the valve core 30 is provided with a balancing channel 31, which runs through one end of the valve core 30 close to the valve port 12 and the other end away from the valve port 12; when the valve core 30 moves to close the valve port 121, the balancing channel 31 is connected to the first connecting pipe 13.

[0043] When the valve core 30 closes the valve port 121 and the first connecting pipe 13 is used as an outlet pipe, since the pressure at the first connecting pipe 13 is relatively small and the pressure in the valve cavity 111 is relatively large, the valve core 30 will be subjected to pressure directed to the valve port 121, resulting in the need for the screw 21 to provide a relatively large force on the valve core 30 to overcome the pressure on the valve core 30 and drive the valve core 30 to move in a direction away from the valve port 121. In this embodiment, by providing a balancing channel 31 on the valve core 30, the first connecting pipe 13 is connected to the guide sleeve 15, so that the end face of the valve core 30 close to the valve port member 12 and the end face away from the valve port member 12 are subjected to the same pressure, thereby facilitating the screw 21 to drive the valve core 30 to move in a direction away from the valve port member 12 to open the valve port member 12.

[0044] Specifically, one end of the screw rod 21 close to the valve port member 12 is inserted into the valve core 30 , and a balance channel 31 is formed between the outer wall of the screw rod 21 and the inner wall of the valve core 30 .

[0045] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. An electric valve, comprising a valve body assembly (10), a transmission assembly (20) and a valve core (30), wherein the valve body assembly (10) has a valve port (121), the valve core (30) is movably mounted on the valve body assembly (10), and the transmission assembly (20) is used to drive the valve core (30) to move toward or away from the valve port (121) so as to close or open the valve port (121); It is characterized in that The valve body assembly (10) comprises a valve seat (11), a valve port member (12), a first connecting pipe (13) and a second connecting pipe (14); the valve port (121) is opened in the valve port member (12); the valve seat (11) has a valve cavity (111); the valve port member (12) is installed in the valve cavity (111); the first connecting pipe (13) is connected to the valve cavity (111) from the peripheral side of the valve seat (11) through the valve port (121); and the second connecting pipe (14) is directly connected to the valve cavity (111) from the peripheral side of the valve seat (11); The transmission assembly (20) comprises a screw rod (21) and a threaded sleeve (22), wherein the screw rod (21) is inserted into the threaded sleeve (22) and is threadedly connected to the threaded sleeve (22), wherein one of the screw rod (21) and the threaded sleeve (22) is connected to the valve core (30) and is used to drive the valve core (30) to move axially.

2. The electric valve according to claim 1, characterized in that: The first connecting pipe (13) and the second connecting pipe (14) are coaxially arranged.

3. The electric valve according to claim 1, characterized in that: The valve port (121) is coaxially arranged with the valve core (30); an interface (122) is provided on the side wall of the valve port member (12); the interface (122) is communicated with the valve port (121) and is used for installing the first connecting pipe (13).

4. The electric valve according to claim 1, characterized in that: The inner wall of the valve port (121) is provided with a mating surface (123), the mating surface (123) is configured as a conical surface, and the radius of the mating surface (123) tends to decrease along the direction from the valve core (30) to the valve port member (12).

5. The electric valve according to claim 1, characterized in that: The threaded sleeve (22) is fixedly connected to the valve body assembly (10), and the valve core (30) is connected to the screw rod (21). As the screw rod (21) rotates circumferentially, the screw rod (21) can drive the valve core (30) to move axially.

6. The electric valve according to claim 5, characterized in that: The valve body assembly (10) further comprises a guide sleeve (15), wherein the guide sleeve (15) is connected to one end of the valve seat (11) and is surrounded by the valve seat (11) to form the valve cavity (111), wherein the outer wall of the valve core (30) and the inner wall of the guide sleeve (15) are movably sealed and cooperated with each other, and the threaded sleeve (22) is arranged at one end of the guide sleeve (15) facing away from the valve cavity (111), and the threaded sleeve (22) is fixedly connected to the valve seat (11); and / or the threaded sleeve (22) is fixedly connected to the guide sleeve (15).

7. The electric valve according to claim 6, characterized in that: The inner wall of the valve seat (11) is provided with a stop step (112), the guide sleeve (15) is mounted on the stop step (112), and the outer wall of the guide sleeve (15) is interference fit with the inner wall of the stop step (112).

8. The electric valve according to claim 7, characterized in that: The bottom wall of the valve cavity (111) is provided with a positioning groove (115), and the valve port member (12) is installed in the positioning groove (115); Alternatively, the valve port member (12) and the valve seat (11) are integrally formed.

9. The electric valve according to claim 8, characterized in that: The positioning groove (115) is coaxially arranged with the stop step (112).

10. The electric valve according to claim 1, characterized in that: The valve core (30) is provided with a balancing channel (31), and the balancing channel (31) passes through one end of the valve core (30) close to the valve port (12) and one end away from the valve port (12). When the valve core (30) moves to close the valve port (121), the balancing channel (31) is connected to the first connecting pipe (13).

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