Solenoid valve

Abstract

The utility model provides an electromagnetic valve which comprises a valve body assembly, a valve core assembly, a valve core assembly, a valve core assembly, a valve core assembly and a valve core assembly, and is characterized in that the valve body assembly is provided with a circulation cavity, and the circulation cavity is provided with a valve port; the piston assembly is arranged in the circulation cavity and comprises a piston sleeve and a piston, the piston sleeve is provided with a piston cavity, the piston is movably arranged in the piston cavity, and the piston is used for blocking or opening the valve port; the pilot valve assembly is arranged on the piston assembly and provided with a pilot valve cavity and a pilot valve seat, the pilot valve seat is connected with the piston sleeve, a pilot valve port is formed in the pilot valve seat and communicated with the pilot valve cavity, the pilot valve port is used for communicating the connecting pipe with the pilot valve cavity, a communicating channel is formed between the pilot valve seat and the piston sleeve, one end of the communicating channel is communicated with the pilot valve cavity, and the other end of the communicating channel is communicated with the pilot valve cavity. The other end of the communicating channel communicates with the piston cavity. By means of the technical scheme, the problem that in the prior art, the communicating path of the pilot valve cavity and the piston cavity is complex can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, in particular to a solenoid valve. Background Art

[0002] Existing solenoid valves usually include a valve body assembly, a piston assembly and a pilot valve assembly. The valve body assembly is connected to the pipeline. The piston assembly has a piston cavity for blocking the valve port of the valve body assembly, thereby controlling the on-off of the fluid flow path. The pilot valve assembly is arranged on the valve body assembly. The pilot valve assembly is provided with a pilot valve cavity, which is connected to the piston cavity. By controlling the pressure of the piston cavity, the movement of the piston assembly is controlled. In the current solenoid valve, the pilot valve assembly is usually arranged on the valve body assembly. By connecting the pilot valve cavity with the valve body assembly, the connection with the piston cavity is achieved. However, this will prolong the flow path of the fluid and affect the reaction time of the piston assembly. In addition, in the manufacturing process of the solenoid valve, corresponding openings need to be opened on the valve body assembly, the pilot valve assembly and the piston assembly. This will result in the need to locate more holes during the assembly process of the solenoid valve, affecting the assembly accuracy of the solenoid valve. Utility Model Content

[0003] The utility model provides a solenoid valve to solve the problem of complex communication paths between a pilot valve cavity and a piston cavity in the prior art.

[0004] The utility model provides a solenoid valve, which comprises: a valve body assembly, the valve body assembly having a circulation cavity, the circulation cavity having a valve port, and the valve port is used to be connected to a connecting pipe; a piston assembly, which is arranged in the circulation cavity, the piston assembly comprising a piston sleeve and a piston, the piston sleeve having a piston cavity, the piston being movably arranged in the piston cavity, and the piston being used to block or open the valve port; a pilot valve assembly, which is arranged on the piston assembly, the pilot valve assembly having a pilot valve cavity and a pilot valve seat, the pilot valve seat being connected to the piston sleeve, the pilot valve seat being provided with a pilot valve port, the pilot valve port being communicated with the pilot valve cavity, the pilot valve port being used to connect the connecting pipe with the pilot valve cavity, a communicating channel being provided between the pilot valve seat and the piston sleeve, one end of the communicating channel being communicated with the pilot valve cavity, and the other end of the communicating channel being communicated with the piston cavity.

[0005] Further, the communication channel arranged on the pilot valve seat extends along the axial direction of the pilot valve seat.

[0006] Furthermore, a mounting groove is provided on the piston sleeve, the pilot valve seat is provided in the mounting groove, a first connecting hole is provided in the mounting groove, a straight hole is provided on the pilot valve seat, the first connecting hole is provided corresponding to the straight hole, and the first connecting hole is connected with the straight hole to form a connecting channel.

[0007] Furthermore, the inner diameter of the straight hole is equal to the inner diameter of the first connecting hole.

[0008] Furthermore, a plurality of communication channels are provided.

[0009] Furthermore, a balance channel is provided between the piston chamber and the circulation chamber to connect the piston chamber and the circulation chamber.

[0010] Further, the valve port includes a first valve port and a second valve port, the first valve port and the second valve port are relatively arranged at two ends of the circulation chamber, the first valve port is connected to the first connecting pipe, and the second valve port is connected to the second connecting pipe; the piston assembly has a relatively arranged conducting state and a blocking state, when the piston assembly is in the blocking state, it can block the first valve port and / or the second valve port, when the piston assembly is in the conducting state, it can make the first connecting pipe communicate with the second connecting pipe through the circulation chamber; the pilot valve assembly also has a first flow channel and a second flow channel, one end of the first flow channel is used to communicate with the first connecting pipe, and the other end of the first flow channel is communicated with the pilot valve chamber, one end of the second flow channel is used to communicate with the second connecting pipe, and the other end of the second flow channel is communicated with the pilot valve chamber, the pilot valve assembly has a relatively arranged open state and a closed state, when the pilot valve assembly is in the open state, one of the first flow channel and the second flow channel is communicated with the pilot valve chamber, and the piston assembly is in the conducting state; when the pilot valve assembly is in the closed state, the pilot valve chamber is not communicated with the first flow channel and the second flow channel, and the piston assembly is in the blocking state.

[0011] Further, the minimum flow area of ​​the balancing channel is smaller than the minimum flow area when the first flow channel is connected to the pilot valve cavity, and the minimum flow area of ​​the balancing channel is smaller than the minimum flow area when the second flow channel is connected to the pilot valve cavity.

[0012] Furthermore, a first balancing hole is provided on the piston sleeve, the first balancing hole connects the piston cavity and the circulation cavity, and the first balancing hole forms a balancing channel.

[0013] Furthermore, a second balancing hole is provided on the pilot valve seat, the second balancing hole communicates with the flow cavity and the communicating channel, and the second balancing hole forms a balancing channel.

[0014] Furthermore, a sealing plate is provided in the balancing channel, and an adjustment hole is provided on the sealing plate.

[0015] The technical solution of the utility model is applied, and the solenoid valve includes a valve body assembly, a piston assembly and a pilot valve assembly. The pilot valve seat is arranged on the piston sleeve, and a connecting channel is arranged between the pilot valve seat and the piston sleeve to connect the pilot valve cavity and the piston cavity. Compared with the scheme of connecting through the valve body assembly in the traditional technical scheme, the flow path of the fluid can be shortened and the response speed of the solenoid valve can be improved; and by processing the connecting channel between the pilot valve seat and the piston sleeve, the number of openings that need to be processed in the production process of the solenoid valve can be reduced as much as possible, the processing difficulty is reduced, and fewer holes need to be positioned and aligned, which can improve the assembly efficiency of the solenoid valve, and at the same time, the assembly accuracy of the solenoid valve can be guaranteed, and the flow effect of the fluid between the pilot valve cavity and the piston cavity can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 The structure schematic diagram of the solenoid valve provided by the utility model when the fluid flows from the first connecting pipe to the second connecting pipe and the piston assembly is in a conducting state is shown;

[0018] Figure 2 The structure schematic diagram of the solenoid valve provided by the utility model is shown when the fluid flows from the first connecting pipe to the second connecting pipe and the piston assembly is in a blocking state;

[0019] Figure 3 The structure schematic diagram of the solenoid valve provided by the utility model is shown when the fluid flows from the second connecting pipe to the first connecting pipe and the piston assembly is in an open state;

[0020] Figure 4 The structure schematic diagram of the solenoid valve provided by the utility model is shown when the fluid flows from the second connecting pipe to the first connecting pipe and the piston assembly is in a blocking state;

[0021] Figure 5 A side cross-sectional view showing the cooperation between the pilot valve seat and the piston sleeve provided by the embodiment of the utility model is shown;

[0022] Figure 6 Shows Figure 5 A partial enlarged view of point A in the middle.

[0023] The above drawings include the following reference numerals:

[0024] 1. First takeover; 2. Second takeover;

[0025] 100, circulation chamber; 200, piston chamber; 300, pilot valve chamber;

[0026] 10. Valve body assembly; 101. First valve port; 102. Second valve port;

[0027] 20. Piston assembly;

[0028] 21. first piston; 22. second piston; 23. piston sleeve; 231. first connecting hole; 233. first balancing hole; 24. elastic member;

[0029] 30. pilot valve assembly; 301. first flow channel; 302. second flow channel; 303. pilot valve port;

[0030] 31. First one-way valve; 32. Second one-way valve; 34. Pilot valve seat; 343. Straight hole; 348. Sealing plate; 3481. Adjusting hole. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0032] like Figures 1 to 5 As shown, the embodiment of the utility model provides a solenoid valve, which includes a valve body assembly 10, a piston assembly 20 and a pilot valve assembly 30. The valve body assembly 10 has a circulation cavity 100, and the circulation cavity 100 has a valve port, which is used to connect with a pipe. The piston assembly 20 is arranged in the circulation cavity 100, and the piston assembly 20 includes a piston sleeve 23 and a piston, and the piston sleeve 23 has a piston cavity 200. The piston is movably arranged in the piston cavity 200, and the piston is used to block or open the valve port. The pilot valve assembly 30 is arranged on the piston assembly 20. The pilot valve assembly 30 has a pilot valve cavity 300 and a pilot valve seat 34. The pilot valve seat 34 is connected to the piston sleeve 23. A pilot valve port 303 is arranged on the pilot valve seat 34. The pilot valve port 303 is connected to the pilot valve cavity 300. The pilot valve port 303 is used to connect the connecting pipe with the pilot valve cavity 300. A connecting channel is provided between the pilot valve seat 34 and the piston sleeve 23. One end of the connecting channel is connected to the pilot valve cavity 300, and the other end of the connecting channel is connected to the piston cavity 200.

[0033] By applying the technical solution of the utility model, the solenoid valve includes a valve body assembly 10, a piston assembly 20 and a pilot valve assembly 30. The pilot valve seat 34 is arranged on the piston sleeve 23, and a communication channel is arranged between the pilot valve seat 34 and the piston sleeve 23 to connect the pilot valve cavity 300 and the piston cavity 200. Compared with the scheme of connecting through the valve body assembly in the traditional technical scheme, the flow path of the fluid can be shortened and the response speed of the solenoid valve can be improved; and by processing the communication channel between the pilot valve seat 34 and the piston sleeve 23, the number of openings that need to be processed in the production process of the solenoid valve can be reduced as much as possible, the processing difficulty is reduced, and fewer holes need to be positioned and aligned, which can improve the assembly efficiency of the solenoid valve, and at the same time, the assembly accuracy of the solenoid valve can be guaranteed, and the flow effect of the fluid between the pilot valve cavity 300 and the piston cavity 200 can be guaranteed.

[0034] In a feasible embodiment of the present application, the communication channel provided on the pilot valve seat 34 extends along the axial direction of the pilot valve seat 34. Through the above arrangement, during the processing of the pilot valve seat 34, the communication channel can be roughly processed on the pilot valve seat 34, and then the pilot valve seat 34 is fixed on the piston sleeve 23, and the communication channel is finely processed, so that the matching accuracy of the communication channel on the pilot valve seat 34 and the piston sleeve 23 is higher, and the flow capacity is stronger.

[0035] Specifically in this application, refer to Figure 5 As shown, the piston sleeve 23 is provided with a mounting groove, the pilot valve seat 34 is provided in the mounting groove, the mounting groove is provided with a first connecting hole 231, the pilot valve seat 34 is provided with a straight hole 343, the first connecting hole 231 and the straight hole 343 are provided correspondingly, and the first connecting hole 231 and the straight hole 343 are connected to form a connecting channel. Through the above arrangement, the straight hole 343 can be pre-roughly machined on the pilot valve seat 34, and the first connecting hole 231 can also be pre-roughly machined on the piston sleeve 23. During the assembly process of the pilot valve seat 34 and the piston sleeve 23, the first connecting hole 231 and the straight hole 343 can be used to improve the positioning effect. After the assembly is completed, the straight hole 343 and the first connecting hole 231 can be uniformly fine-machined, so as to improve the matching accuracy of the first connecting hole 231 and the straight hole 343, prevent the matching error between the first connecting hole 231 and the straight hole 343 from reducing the flow area of ​​the connecting channel, and ensure the flow effect of the fluid in the connecting channel.

[0036] Specifically, the inner diameter of the straight hole 343 is equal to the inner diameter of the first connection hole 231. Through the above arrangement, the matching effect of the straight hole 343 and the first connection hole 231 can be ensured, and the fluid in the connecting channel is prevented from being subjected to flow resistance due to the change in the flow area, thereby ensuring the flow effect of the fluid. At the same time, it is also convenient to simultaneously perform fine processing on the straight hole 343 and the first connection hole 231, thereby improving the processing efficiency.

[0037] In some feasible embodiments of the present application, a plurality of communication channels are provided. Such a configuration can meet the requirements of pilot valve assemblies with different flow capacity requirements and improve the applicability of the solenoid valve. Specifically, the communication channels can be provided with 2 or 3 channels.

[0038] Specifically in the present application, the valve port includes a first valve port 101 and a second valve port 102, the first valve port 101 and the second valve port 102 are relatively arranged at the two ends of the circulation chamber 100, the first valve port 101 is used to connect with the first connecting pipe 1, and the second valve port 102 is used to connect with the second connecting pipe 2. The piston assembly 20 has a relatively arranged conducting state and a blocking state. When the piston assembly 20 is in the blocking state, it can block the first valve port 101 and / or the second valve port 102. When the piston assembly 20 is in the conducting state, it can make the first connecting pipe 1 communicate with the second connecting pipe 2 through the circulation chamber 100. The pilot valve assembly 30 also has a first flow channel 301 and a second flow channel 302. One end of the first flow channel 301 is used to communicate with the first connecting pipe 1, and the other end of the first flow channel 301 is communicated with the pilot valve cavity 300. One end of the second flow channel 302 is used to communicate with the second connecting pipe 2, and the other end of the second flow channel 302 is communicated with the pilot valve cavity 300. The pilot valve assembly 30 has a relatively set open state and a closed state. When the pilot valve assembly 30 is in the open state, one of the first flow channel 301 and the second flow channel 302 is communicated with the pilot valve cavity 300, and the piston assembly 20 is in the conducting state; when the pilot valve assembly 30 is in the closed state, the pilot valve cavity 300 is not communicated with the first flow channel 301 and the second flow channel 302, and the piston assembly 20 is in the blocked state.

[0039] Further, the pilot valve assembly 30 also includes a first one-way valve 31 and a second one-way valve 32. The first one-way valve 31 is arranged on the first flow channel 301, and the first one-way valve 31 is unidirectionally connected from the pilot valve chamber 300 to the direction of the first connecting pipe 1, and the second one-way valve 32 is arranged on the second flow channel 302, and the second one-way valve 32 is unidirectionally connected from the pilot valve chamber 300 to the direction of the second connecting pipe 2. When the pilot valve assembly 30 is switched to the open state, the first one-way valve 31 connects the pilot valve chamber 300 with the first flow channel 301, and the pilot valve chamber 300 is not connected with the second flow channel 302; or, the second one-way valve 32 connects the pilot valve chamber 300 with the second flow channel 302, and the pilot valve chamber 300 is not connected with the first flow channel 301. Through the above arrangement, when the fluid flows from the first connecting pipe 1 to the second connecting pipe 2, after the pilot valve assembly 30 switches to the open state, the first one-way valve 31 is closed, the first flow channel 301 is not connected to the pilot valve chamber 300, the second one-way valve 32 is opened, and the second flow channel 302 can be connected to the pilot valve chamber 300; when the fluid flows from the second connecting pipe 2 to the first connecting pipe 1, after the pilot valve assembly 30 switches to the open state, the second one-way valve 32 is closed, the second flow channel 302 is not connected to the pilot valve chamber 300, the first one-way valve 31 is opened, and the first flow channel 301 can be connected to the pilot valve chamber 300.

[0040] Specifically in this application, refer to Figure 1As shown, the piston assembly 20 also includes a first piston 21, a second piston 22, and an elastic member 24. The first piston 21 and the second piston 22 are both movably disposed in the piston sleeve 23, the end of the first piston 21 away from the second piston 22 forms a first sealing end, the first end of the second piston 22 away from the first piston 21 forms a second sealing end, and the first piston 21, the second piston 22 and the inner wall of the piston sleeve 23 cooperate to form a piston chamber 200. The elastic member 24 is disposed between the first piston 21 and the second piston 22, and the elastic member 24 can provide an elastic force for the first piston 21 and the second piston 22 to move away from each other.

[0041] In a feasible embodiment of the present application, when the solenoid valve switches from a closed state to an open state, the switching action of the piston assembly 20 is as follows:

[0042] Reference Figure 1 and Figure 2 As shown, when the fluid flows from the first connecting pipe 1 to the second connecting pipe 2, the pressure in the first connecting pipe 1 is greater than the pressure in the second connecting pipe 2, the pilot valve assembly 30 is switched to the open state, the first check valve 31 on the first flow channel 301 is closed, the first flow channel 301 is not connected to the pilot valve chamber 300, the second check valve 32 on the second flow channel 302 is opened, the pilot valve chamber 300 is connected to the second flow channel 302, the piston chamber 200 can be connected to the second flow channel 302, the pressure in the piston chamber 200 is reduced, at this time the pressure in the first connecting pipe 1 is greater than the pressure in the piston chamber 200, the first piston 21 is The pressure to the first connecting pipe 1 is greater than the pressure in the piston chamber 200 and the elastic member 24, the first piston 21 moves away from the first valve port 101, the first valve port 101 opens, the fluid enters the circulation chamber 100, the side wall at the end of the second piston 22 is subjected to a pressure of the fluid greater than the pressure in the piston chamber 200 and the pressure of the elastic member 24, the second piston 22 can move away from the second valve port 102 driven by the pressure difference, the second valve port 102 opens, the piston assembly 20 switches to the conducting state, and the fluid can flow from the first connecting pipe 1 to the second connecting pipe 2 through the circulation chamber 100.

[0043] Reference Figure 3 and Figure 4As shown, when the fluid flows from the second connecting pipe 2 to the first connecting pipe 1, the pressure in the second connecting pipe 2 is greater than the pressure in the first connecting pipe 1, the pilot valve assembly 30 is switched to the open state, the second one-way valve 32 on the second flow channel 302 is closed, the first flow channel 301 is not connected to the pilot valve cavity 300, the first one-way valve 31 on the first flow channel 301 is opened, the pilot valve cavity 300 is connected to the first flow channel 301, the piston cavity 200 can be connected to the first flow channel 301, the pressure in the piston cavity 200 is reduced, and at this time the pressure in the second connecting pipe 2 is greater than the pressure in the piston cavity 200, and the second piston 22 is The pressure to the second connecting pipe 2 is greater than the pressure in the piston chamber 200 and the elastic member 24, the second piston 22 moves away from the second valve port 102, the second valve port 102 opens, the fluid enters the circulation chamber 100, the side wall at the end of the first piston 21 is subjected to a pressure of the fluid greater than the pressure in the piston chamber 200 and the pressure of the elastic member 24, the first piston 21 can move away from the first valve port 101 driven by the pressure difference, the first valve port 101 opens, the piston assembly 20 switches to the conducting state, and the fluid can flow from the second connecting pipe 2 to the first connecting pipe 1 through the circulation chamber 100.

[0044] In the present application, a balance channel is provided between the piston chamber 200 and the circulation chamber 100 to connect the piston chamber 200 and the circulation chamber 100. Through the above arrangement, the fluid in the circulation chamber 100 can enter the piston chamber 200 through the balance channel, and pass through the piston chamber 200 and the pilot valve chamber 300, and flow to the first flow channel 301 or the second flow channel 302, so as to meet the pressure requirement of the piston chamber 200 when the solenoid valve is opened and closed.

[0045] In a feasible embodiment of the present application, when the solenoid valve switches from the open state to the closed state, the switching action of the piston assembly 20 is as follows:

[0046] Reference Figures 1 to 4 As shown, the pilot valve assembly 30 is switched to a closed state, the first flow channel 301 and the second flow channel 302 are not connected to the pilot valve chamber 300, the fluid in the circulation chamber 100 flows into the piston chamber 200 through the balance channel, the pressure in the piston chamber 200 increases, the pressure of the piston chamber 200 on the first piston 21 and the second piston 22 cooperates with the pressure of the elastic member 24 on the first piston 21 and the second piston 22, so that the first piston 21 moves toward the first valve port 101, and the second piston 22 moves toward the second valve port 102, the piston assembly 20 is switched to a blocked state, the first piston 21 blocks the first valve port 101, the second piston 22 blocks the second valve port 102, and the first connecting pipe 1 and the second connecting pipe 2 are not connected to the circulation chamber 100.

[0047] In the present application, the minimum flow area of ​​the balancing channel is smaller than the minimum flow area when the first flow channel 301 is connected to the pilot valve chamber 300, and the minimum flow area of ​​the balancing channel is smaller than the minimum flow area when the second flow channel 302 is connected to the pilot valve chamber 300, that is, the flow capacity of the balancing channel at the minimum flow area is smaller than the flow capacity when the first one-way valve 31 and the second one-way valve 32 are opened. When the piston assembly 20 is in the conducting state, the pressure in the piston chamber 200 drops, and the pressure in the piston chamber 200 is smaller than the pressure in the flow chamber 100. The first piston 21 and the second piston 22 will not move under the elastic force of the elastic member 24 to ensure stable operation of the solenoid valve.

[0048] In a specific embodiment of the present application, refer to Figure 6 As shown, the piston sleeve 23 is provided with a first balancing hole 233, which connects the piston chamber 200 with the circulation chamber 100, and forms a balancing channel. Through the above arrangement, the fluid in the circulation chamber 100 can flow into the piston chamber 200 through the first balancing hole 233, and the balancing channel is processed on the piston sleeve 23, so that the piston chamber 200 can be directly connected with the circulation chamber, shortening the circulation path of the fluid.

[0049] In some other embodiments of the present application, a second balancing hole can be provided on the pilot valve seat 34, the second balancing hole connects the circulation chamber 100 and the communication channel, and the second balancing hole forms a balancing channel. Through the above arrangement, the fluid in the circulation chamber 100 will flow into the piston chamber 200 through the balancing channel and the communication channel. Compared with setting the balancing channel on the piston sleeve 23, by setting the balancing channel on the pilot valve seat 34, the second balancing hole can be processed when processing the communication channel on the pilot valve seat 34, which is convenient for improving production efficiency. The overall volume of the pilot valve seat 34 is small, which can also reduce the difficulty of processing.

[0050] Furthermore, a sealing plate 348 is provided in the balancing channel, and an adjustment hole 3481 is provided on the sealing plate 348. Through the above arrangement, when the flow area of ​​the balancing channel needs to be adjusted, only the sealing plate 348 with the adjustment hole 3481 having a different aperture needs to be replaced, which is conducive to the standardization of various parts of the solenoid valve and facilitates production and processing.

[0051] In some implementations of the present application, a stepped surface may be provided in the first balancing hole 233 or the second balancing hole to limit the displacement of the sealing plate 348 .

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0053] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0054] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0055] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0056] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0057] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A solenoid valve, characterized in that: The solenoid valve comprises: A valve body assembly (10), the valve body assembly (10) having a flow chamber (100), the flow chamber (100) having a valve port, the valve port being used for connecting to a pipe; A piston assembly (20) is arranged in the circulation chamber (100), the piston assembly (20) comprising a piston sleeve (23) and a piston, the piston sleeve (23) having a piston chamber (200), the piston being movably arranged in the piston chamber (200), and the piston being used to block or open the valve port; A pilot valve assembly (30) is arranged on the piston assembly (20), the pilot valve assembly (30) having a pilot valve chamber (300) and a pilot valve seat (34), the pilot valve seat (34) being connected to the piston sleeve (23), the pilot valve seat (34) being provided with a pilot valve port (303), the pilot valve port (303) being communicated with the pilot valve chamber (300), the pilot valve port (303) being used to connect the connecting pipe with the pilot valve chamber (300), a communication channel being provided between the pilot valve seat (34) and the piston sleeve (23), one end of the communication channel being communicated with the pilot valve chamber (300), and the other end of the communication channel being communicated with the piston chamber (200).

2. The solenoid valve according to claim 1, characterized in that: The communication passage arranged on the pilot valve seat (34) extends along the axial direction of the pilot valve seat (34).

3. The solenoid valve according to claim 2, characterized in that: The piston sleeve (23) is provided with a mounting groove, the pilot valve seat (34) is arranged in the mounting groove, a first connecting hole (231) is arranged in the mounting groove, a straight hole (343) is arranged on the pilot valve seat (34), the first connecting hole (231) and the straight hole (343) are arranged correspondingly, and the first connecting hole (231) and the straight hole (343) are connected to form the connecting channel.

4. The solenoid valve according to claim 3, characterized in that: The inner diameter of the linear hole (343) is equal to the inner diameter of the first connecting hole (231).

5. The solenoid valve according to claim 1, characterized in that: The communicating channels are provided in plurality.

6. The solenoid valve according to claim 5, characterized in that: A balance channel is provided between the piston chamber (200) and the circulation chamber (100) so as to connect the piston chamber (200) and the circulation chamber (100).

7. The solenoid valve according to claim 6, characterized in that: The valve port comprises a first valve port (101) and a second valve port (102), the first valve port (101) and the second valve port (102) being arranged at two ends of the circulation chamber (100) opposite to each other, the first valve port (101) being connected to a first connecting pipe (1), and the second valve port (102) being connected to a second connecting pipe (2); The piston assembly (20) has a conducting state and a blocking state which are arranged relatively to each other. When the piston assembly (20) is in the blocking state, it can block the first valve port (101) and / or the second valve port (102). When the piston assembly (20) is in the conducting state, it can make the first connecting pipe (1) communicate with the second connecting pipe (2) through the flow chamber (100); The pilot valve assembly (30) further comprises a first flow channel (301) and a second flow channel (302); one end of the first flow channel (301) is used to communicate with the first connecting pipe (1), and the other end of the first flow channel (301) is used to communicate with the pilot valve cavity (300); one end of the second flow channel (302) is used to communicate with the second connecting pipe (2), and the other end of the second flow channel (302) is used to communicate with the pilot valve cavity (300); the pilot valve assembly (30) has an open state and a closed state which are arranged relatively; when the pilot valve assembly (30) is in the open state, one of the first flow channel (301) and the second flow channel (302) is communicated with the pilot valve cavity (300), and the piston assembly (20) is in the conducting state; when the pilot valve assembly (30) is in the closed state, the pilot valve cavity (300) is not communicated with the first flow channel (301) and the second flow channel (302), and the piston assembly (20) is in the blocking state.

8. The solenoid valve according to claim 7, characterized in that: The minimum flow area of ​​the balancing channel is smaller than the minimum flow area when the first flow channel (301) is connected to the pilot valve chamber (300), and the minimum flow area of ​​the balancing channel is smaller than the minimum flow area when the second flow channel (302) is connected to the pilot valve chamber (300).

9. The solenoid valve according to claim 6, characterized in that: The piston sleeve (23) is provided with a first balancing hole (233), the first balancing hole (233) communicating the piston cavity (200) with the circulation cavity (100), and the first balancing hole (233) forming the balancing channel.

10. The solenoid valve according to claim 6, characterized in that: The pilot valve seat (34) is provided with a second balancing hole, the second balancing hole communicating with the flow chamber (100) and the communicating channel, the second balancing hole forming the balancing channel.

11. The solenoid valve according to claim 9 or 10, characterized in that: A sealing plate (348) is arranged in the balancing channel, and an adjustment hole (3481) is provided on the sealing plate (348).

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