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, the piston assembly is used for blocking or opening the valve port, and the piston assembly is provided with a piston cavity; 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 provided with a pilot valve port and a communicating channel, the pilot valve port is formed in the end, away from the piston assembly, of the pilot valve seat and used for communicating the connecting pipe with the pilot valve cavity, one end of the communicating channel communicates with the pilot valve cavity, and the other end of the communicating channel communicates with the piston cavity; a port, away from one side of the pilot valve cavity, of the communicating channel is coaxial with the pilot valve seat. By means of the electromagnetic valve, the problem that in the prior art, a pilot valve seat is difficult to machine 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 typically 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 chamber for sealing the valve port of the valve body assembly, thereby controlling the flow of the fluid. The pilot valve assembly is mounted on the valve body assembly and is provided with a pilot valve chamber, which is connected to the piston chamber. By controlling the pressure in the piston chamber, the movement of the piston assembly is controlled. In current solenoid valves, a connecting channel is typically provided on the pilot valve seat to achieve communication between the pilot valve chamber and the piston chamber. During the processing of the connecting channel, the relative position of the connecting channel and the piston assembly must be positioned, which places high demands on the processing technology of the pilot valve seat. This makes it impossible to ensure the connection function of the connecting channel, affecting the processing yield rate. Utility Model Content

[0003] The utility model provides a solenoid valve to solve the problem in the prior art that the pilot valve seat is difficult to process.

[0004] The utility model provides a solenoid valve, which includes: a valve body assembly, the valve body assembly having a circulation cavity, the circulation cavity having a valve port, and the valve port being used to connect to a connecting pipe; a piston assembly, which is arranged in the circulation cavity, the piston assembly being used to block or open the valve port, and the piston assembly having a piston cavity; 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 port and a communicating channel being provided on the pilot valve seat, the pilot valve port being provided at one end of the pilot valve seat away from the piston assembly, the pilot valve port being used to connect the connecting pipe and the pilot valve cavity, 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, and a port of the communicating channel on a side away from the pilot valve cavity is coaxially arranged with the pilot valve seat.

[0005] Furthermore, the pilot valve port is coaxially arranged with the pilot valve seat, and the port of the communication channel close to the pilot valve cavity side is not coaxial with the pilot valve seat.

[0006] Furthermore, the communication channel has a plurality of hole sections that are connected in sequence, and the hole section close to the pilot valve chamber and the hole section close to the piston assembly both extend along the axial direction of the pilot valve seat.

[0007] Furthermore, a balance channel is provided between the piston chamber and the circulation chamber to connect the piston chamber and the circulation chamber.

[0008] Furthermore, the communication channel has a plurality of hole segments that are connected in sequence, one of the plurality of hole segments is arranged to penetrate the outer side wall of the pilot valve seat, and the hole segment that penetrates the outer side wall of the pilot valve seat forms a balancing channel.

[0009] Furthermore, a balancing hole is provided on the piston assembly, the balancing hole communicates with the pilot valve cavity and the flow cavity, and the balancing hole forms a balancing channel.

[0010] Furthermore, a sealing plate is provided in the balancing channel, and an adjustment hole is provided on the sealing plate.

[0011] Furthermore, the valve port includes a first valve port and a second valve port, which are relatively arranged at the two ends of the circulation chamber, the first valve port is used to connect to the first connecting pipe, and the second valve port is used to connect 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, and 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.

[0012] Furthermore, 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.

[0013] Furthermore, a positioning boss is provided on the pilot valve seat, and the positioning boss is annularly arranged on the outer periphery of the communicating channel. A second connecting hole is provided on the piston assembly, and the positioning boss is inserted into the second connecting hole.

[0014] The solenoid valve employing the technical solution of the present invention includes a valve body assembly, a piston assembly, and a pilot valve assembly. A communication channel connects the pilot valve chamber and the piston chamber. By arranging the port of the communication channel, remote from the pilot valve chamber, to be coaxial with the pilot valve seat, the communication channel can be easily positioned on the pilot valve seat, ensuring precise machining of the communication channel and preventing deviations when the pilot valve seat and the piston assembly mate, thereby ensuring the communication function of the communication channel. This also facilitates clamping of the fixture and machining of the communication channel during the machining of the pilot valve seat, improving the convenience and production efficiency of the pilot valve seat machining. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1The structure diagram of the solenoid valve provided by the present invention is shown when the fluid flows from the first connecting pipe to the second connecting pipe and the piston assembly is in a conducting state;

[0017] Figure 2 A schematic structural diagram of the solenoid valve provided by the present invention is shown when the fluid flows from the first connecting pipe to the second connecting pipe and the piston assembly is in an open state;

[0018] Figure 3 A schematic diagram of the structure of the solenoid valve provided by the present invention is shown when the fluid flows from the second connecting pipe to the first connecting pipe and the piston assembly is in a blocked state;

[0019] Figure 4 A schematic diagram of the structure of the solenoid valve provided by the present invention is shown when the fluid flows from the second connecting pipe to the first connecting pipe and the piston assembly is in a blocked state;

[0020] Figure 5 A side cross-sectional view of a pilot valve seat provided by a first embodiment of the present utility model is shown;

[0021] Figure 6 A side cross-sectional view showing the cooperation between the pilot valve seat and the piston sleeve provided by the first embodiment of the present utility model is shown;

[0022] Figure 7 A side cross-sectional view showing the cooperation between the pilot valve seat and the piston sleeve provided by the second embodiment of the present utility model is shown;

[0023] Figure 8 Shown Figure 6 A partial enlarged view of point A in the middle.

[0024] The above drawings include the following reference numerals:

[0025] 1. First takeover; 2. Second takeover;

[0026] 100, circulation chamber; 200, piston chamber; 300, pilot valve chamber;

[0027] 10. Valve body assembly; 101. First valve port; 102. Second valve port;

[0028] 20. Piston assembly;

[0029] 21. First piston; 22. Second piston; 23. Piston sleeve; 232. Second connecting hole; 233. Balance hole; 24. Elastic member;

[0030] 30. Pilot valve assembly; 301. First flow channel; 302. Second flow channel; 303. Pilot valve port;

[0031] 31. First one-way valve; 32. Second one-way valve;

[0032] 34, pilot valve seat; 3441, first hole section; 3442, second hole section; 3443, third hole section;

[0033] 346, positioning boss; 348, sealing plate; 3481, adjustment hole. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] like Figures 1 to 5 As shown, an embodiment of the present invention provides a solenoid valve, comprising a valve body assembly 10, a piston assembly 20, and a pilot valve assembly 30. The valve body assembly 10 has a flow chamber 100, which has a valve port for connecting to a pipe. The piston assembly 20 is disposed in the flow chamber 100 and is used to block or open the valve port. The piston assembly 20 has a piston chamber 200. The pilot valve assembly 30 is disposed on the piston assembly 20. The pilot valve assembly 30 has a pilot valve chamber 300 and a pilot valve seat 34. The pilot valve seat 34 is provided with a pilot valve port 303 and a communication channel. The pilot valve seat 34 is provided with the pilot valve port 303 at one end away from the piston assembly 20. The pilot valve port 303 is used to connect the pipe with the pilot valve chamber 300. One end of the communication channel communicates with the pilot valve chamber 300, and the other end communicates with the piston chamber 200. The port of the communication channel away from the pilot valve chamber 300 is coaxially arranged with the pilot valve seat 34.

[0036] Using the technical solution of the present invention, a solenoid valve includes a valve body assembly 10, a piston assembly 20, and a pilot valve assembly 30. A communication channel connects the pilot valve chamber 300 and the piston chamber 200. By arranging the port of the communication channel, located away from the pilot valve chamber 300, to be coaxial with the pilot valve seat 34, the communication channel is easily positioned on the pilot valve seat 34, ensuring precise machining of the communication channel and preventing deviation of the pilot valve seat 34 when mating with the piston assembly 20, thereby ensuring the communication function of the communication channel. This also facilitates clamping of the fixture and machining of the communication channel during the machining of the pilot valve seat 34, improving the convenience and production efficiency of the pilot valve seat 34.

[0037] Specifically, in the present application, the pilot valve port 303 is coaxially arranged with the pilot valve seat 34, while the port of the communication channel on the side close to the pilot valve cavity 300 is not coaxial with the pilot valve seat 34. This arrangement facilitates the positioning of the pilot valve port 303 during machining, ensuring the machining effect of the pilot valve port 303. The coaxiality of the port of the communication channel on the side close to the pilot valve cavity 300 with the pilot valve seat 34 allows the communication channel to avoid the pilot valve port 303, resulting in a more reasonable spatial arrangement.

[0038] Furthermore, the communication channel has multiple serially connected hole segments. The hole segment near the pilot valve chamber 300 and the hole segment near the piston assembly 20 both extend axially along the pilot valve seat 34. This arrangement allows the communication channel to be directly precision-machined before the pilot valve seat 34 and piston assembly 20 are assembled, ensuring a high-quality machining process and efficient fluid flow within the communication channel.

[0039] Reference Figure 5 and Figure 6 As shown, the communication passage comprises a first hole section 3441, a second hole section 3442, and a third hole section 3443, which are sequentially connected. The end of the third hole section 3443 remote from the first hole section 3441 communicates with the piston chamber 200, while the end of the first hole section 3441 remote from the third hole section 3443 communicates with the pilot valve chamber 300. The first and third hole sections 3441 and 3443 extend axially along the pilot valve seat 34, while the second hole section 3442 extends perpendicular to the axis of the pilot valve seat 34. This arrangement ensures coaxiality between the third hole section 3443 and the second connecting hole 232, facilitating installation and positioning of the pilot valve seat 34.

[0040] Specifically, in this embodiment, a plurality of first hole sections 3441 may be provided, and the plurality of first hole sections 3441 are all connected to the third hole section 3443 through the second hole section 3442 to meet the circulation requirements of the fluid under different flow requirements.

[0041] In the present application, a balancing channel is provided between the piston chamber 200 and the circulation chamber 100 to connect the piston chamber 200 with the circulation chamber 100. Through the above arrangement, the fluid in the circulation chamber 100 can enter the piston chamber 200 through the balancing channel, thereby achieving pressure balance in the piston chamber 200 and ensuring the pressure requirement of the piston assembly 20 when the solenoid valve is opened and closed.

[0042] In the first embodiment of this application, refer to Figure 5 and Figure 6As shown, the communication channel has multiple serially connected hole segments. One of the multiple hole segments is disposed through the outer wall of the pilot valve seat 34. The hole segment that penetrates the outer wall of the pilot valve seat 34 forms a balancing channel. Specifically, in this embodiment, a second hole segment 3442 is disposed horizontally and penetrates the outer wall of the pilot valve seat 34. The second hole segment 3442 forms a balancing channel. This allows fluid to enter the piston chamber 200 through the second hole segment 3442 and the third hole segment 3443. This also facilitates the processing of the second hole segment 3442. The balancing channel can be formed during the processing of the communication channel on the pilot valve seat 34, thereby improving production efficiency. The overall volume of the pilot valve seat 34 is relatively small, which also reduces the processing difficulty.

[0043] In the second embodiment of the present application, refer to Figure 7 As shown, the piston assembly 20 is provided with a balancing hole 233, which connects the pilot valve chamber 300 with the circulation chamber 100, forming a balancing channel. Through this arrangement, the fluid in the circulation chamber 100 can flow into the piston chamber 200 through the balancing hole 233. Including the balancing channel in the piston assembly 20 allows the piston chamber 200 to communicate directly with the circulation chamber, shortening the fluid flow path.

[0044] Reference Figure 8 As shown, a sealing plate 348 is provided in the balancing channel, and an adjustment hole 3481 is provided on the sealing plate 348. With this arrangement, when the flow area of ​​the balancing channel needs to be adjusted, only the sealing plate 348 with a different aperture of the adjustment hole 3481 needs to be replaced, which facilitates the standardization of various parts of the solenoid valve and facilitates production and processing.

[0045] 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 to the first connecting pipe 1, and the second valve port 102 is used to connect to the second connecting pipe 2; the piston assembly 20 has a relatively set 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 enable the first connecting pipe 1 to 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, the first flow channel 301 and the second flow channel 302. One end of a 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 chamber 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 chamber 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 chamber 300, and the piston assembly 20 is in a conducting state; when the pilot valve assembly 30 is in the closed state, the pilot valve chamber 300 is not communicated with the first flow channel 301 and the second flow channel 302, and the piston assembly 20 is in a blocked state.

[0046] Furthermore, 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 disposed on the first flow channel 301, and allows one-way flow from the pilot valve chamber 300 to the first connecting pipe 1. The second one-way valve 32 is disposed on the second flow channel 302, and allows one-way flow from the pilot valve chamber 300 to the second connecting pipe 2. When the pilot valve assembly 30 is switched to an open state, the first one-way valve 31 connects the pilot valve chamber 300 with the first flow channel 301, while the pilot valve chamber 300 is not connected to the second flow channel 302. Alternatively, the second one-way valve 32 connects the pilot valve chamber 300 with the second flow channel 302, while the pilot valve chamber 300 is not connected to the first flow channel 301. Through the above-mentioned 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.

[0047] Specifically in this application, refer to Figure 1As shown, the piston assembly 20 further 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 within a piston sleeve 23. The end of the first piston 21 away from the second piston 22 forms a first sealed end, and the end of the second piston 22 away from the first piston 21 forms a second sealed end. 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 to provide an elastic force that forces the first piston 21 and the second piston 22 to move away from each other.

[0048] 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:

[0049] 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 switches to the open state, the first one-way 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 one-way 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 in the direction away from the first valve port 101, the first valve port 101 opens, the fluid enters the circulation chamber 100, and the pressure on the side wall of the end of the second piston 22 is greater than the pressure in the piston chamber 200 and the pressure of the elastic member 24. The second piston 22 can move in the direction 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.

[0050] 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 switches 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 chamber 300, the first one-way valve 31 on the first flow channel 301 is opened, the pilot valve chamber 300 is connected to the first flow channel 301, the piston chamber 200 can be connected to the first flow channel 301, the pressure in the piston chamber 200 is reduced, at this time the pressure in the second connecting pipe 2 is greater than the pressure in the piston chamber 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 in the direction away from the second valve port 102, the second valve port 102 opens, the fluid enters the circulation chamber 100, and the side wall at the end of the first piston 21 is subjected to a pressure of the fluid that is greater than the pressure in the piston chamber 200 and the pressure of the elastic member 24. The first piston 21 can move in the direction away from the first valve port 101 under the drive of 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.

[0051] In a feasible embodiment of the present application, when the solenoid valve switches from an open state to a closed state, the switching action of the piston assembly 20 is as follows:

[0052] 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 is matched 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.

[0053] In the present application, the minimum flow area of ​​the balancing channel is smaller than the flow area when the first flow channel 301 and the second flow channel 302 are 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 lower 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.

[0054] Specifically, the pilot valve seat 34 is provided with a positioning boss 346, which is annularly arranged on the outer periphery of the communication channel. The piston assembly 20 is provided with a second connecting hole 232, and the positioning boss 346 is inserted into the second connecting hole 232. The positioning boss 346 is inserted into the second connecting hole 232, thereby limiting the displacement of the pilot valve seat 34 in the axial direction, thereby facilitating the installation and positioning of the pilot valve seat 34.

[0055] 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, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0056] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. 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 actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as 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 the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0057] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention 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. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0058] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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.

[0059] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

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) is used to block or open the valve port, and the piston assembly (20) has a piston chamber (200); A pilot valve assembly (30) is arranged on the piston assembly (20), the pilot valve assembly (30) having a pilot valve cavity (300) and a pilot valve seat (34), the pilot valve seat (34) being provided with a pilot valve port (303) and a communicating channel, the pilot valve seat (34) being provided with the pilot valve port (303) at one end away from the piston assembly (20), the pilot valve port (303) being used to connect the connecting pipe with the pilot valve cavity (300), one end of the communicating channel being in communication with the pilot valve cavity (300), and the other end of the communicating channel being in communication with the piston cavity (200), and the port of the communicating channel at the side away from the pilot valve cavity (300) being coaxially arranged with the pilot valve seat (34).

2. The solenoid valve according to claim 1, characterized in that: The pilot valve port (303) is coaxially arranged with the pilot valve seat (34), and the port of the communication channel close to the pilot valve chamber (300) is not coaxial with the pilot valve seat (34).

3. The solenoid valve according to claim 2, characterized in that: The communication channel has a plurality of hole sections that are connected in sequence, and the hole section close to the pilot valve chamber (300) and the hole section close to the piston assembly (20) both extend along the axial direction of the pilot valve seat (34).

4. The solenoid valve according to claim 1, 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).

5. The solenoid valve according to claim 4, characterized in that: The communication channel has a plurality of hole sections that are connected in sequence, one of the plurality of hole sections is arranged to penetrate the outer wall of the pilot valve seat (34), and the hole section that penetrates the outer wall of the pilot valve seat (34) forms the balance channel.

6. The solenoid valve according to claim 4, characterized in that: The piston assembly (20) is provided with a balancing hole (233), the balancing hole (233) communicating with the pilot valve cavity (300) and the circulation cavity (100), and the balancing hole (233) forms the balancing channel.

7. The solenoid valve according to claim 4, 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).

8. The solenoid valve according to claim 4, 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 oppositely at two ends of the circulation chamber (100), the first valve port (101) being used for connecting to a first connecting pipe (1), and the second valve port (102) being used for connecting 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.

9. The solenoid valve according to claim 8, 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).

10. The solenoid valve according to claim 1, characterized in that: The pilot valve seat (34) is provided with a positioning boss (346), the positioning boss (346) being arranged in an annular shape on the outer periphery of the connecting passage; the piston assembly (20) is provided with a second connecting hole (232), the positioning boss (346) being inserted into the second connecting hole (232).

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