Solenoid valve

Abstract

The utility model relates to an electromagnetic valve which comprises a valve body provided with an air inlet and a water inlet. The positioning disc is positioned in the valve body, is used for opening the water inlet and closing the air inlet when water enters the valve body, and is also used for closing the water inlet and opening the air inlet when water enters the valve body; the positioning disc comprises a disc body and a plug, the disc body is provided with a pressure relief hole, and the pressure relief hole is respectively communicated with the water inlet and the air inlet; the plug is movably installed in the disc body and used for closing the pressure relief hole when the water flow pressure of the water inlet is smaller than a preset value so as to cut off communication between the air inlet and the water inlet. The plug is further used for opening the pressure relief hole when the water flow pressure of the water inlet is larger than a preset value so as to communicate the air inlet with the water inlet. The positioning disc plays an anti-siphon role in the valve body, meanwhile, when the water flow pressure of the water inlet is too large in the positioning disc, water drainage and pressure relief can be conducted to the air inlet through the pressure relief hole, the safety of the electromagnetic valve and an installation pipeline of the electromagnetic valve is improved, and the service life of the electromagnetic valve and the installation pipeline of the electromagnetic valve is prolonged.

Description

Technical Field

[0001] The present application relates to the field of valve devices, and in particular to a solenoid valve. Background Art

[0002] Toilets on the market are usually equipped with a flush solenoid valve, which includes a water inlet, a water outlet and an air inlet. At the same time, the interior of the solenoid valve is also designed with an anti-siphon device to prevent sewage in the water outlet from flowing back into the water inlet and polluting the clean water source in the solenoid valve.

[0003] In the prior art, when the water pressure at the water inlet is too high, the solenoid valve is prone to rupture under the action of high pressure, which affects the service life of the battery valve. Utility Model Content

[0004] The present application provides a solenoid valve, which can solve the problem in the prior art that solenoid valves are prone to rupture under high pressure.

[0005] An embodiment of the present application provides a solenoid valve, comprising: a valve body, having an air inlet and a water inlet; a positioning disc, located within the valve body, the positioning disc being used to open the water inlet and close the air inlet when water is admitted to the valve body, and also being used to close the water inlet and open the air inlet when the valve body stops admitting water; the positioning disc comprising a disc body and a plug, the disc body being provided with a pressure relief hole, the pressure relief hole being connected to the water inlet and the air inlet respectively; the plug being movably mounted within the disc body, the plug being used to close the pressure relief hole when the water flow pressure at the water inlet is less than a preset value, so as to cut off the connection between the air inlet and the water inlet; the plug being further used to open the pressure relief hole when the water flow pressure at the water inlet is greater than a preset value, so as to connect the air inlet and the water inlet.

[0006] In one possible design, the valve body also has an air intake channel connected to the air inlet, and the disk body includes a positioning portion, at least a portion of the positioning portion extends into the air intake channel through the air inlet; when the positioning portion moves in the air intake channel, the inner wall of the air intake channel is used to guide the movement of the positioning portion and to prevent the positioning portion from escaping from the air intake channel; the positioning portion is provided with a pressure relief channel, which is respectively connected to the pressure relief hole and the air intake channel; the plug is movably installed on the positioning portion, and when the plug opens the pressure relief hole, the water flow from the water inlet can flow to the air intake channel through the pressure relief hole and the pressure relief channel.

[0007] In a possible design, the positioning portion is provided with a plurality of positioning columns distributed at intervals along the circumference of the positioning portion, and the positioning columns protrude toward the center of the positioning portion along the radial direction of the positioning portion; a limiting space is formed between the plurality of positioning columns, and the plug is movably installed in the limiting space.

[0008] In a possible design, the positioning disk further includes a fixing member and a compression spring, wherein the fixing member is fixedly connected to the disk body; along the axial direction of the positioning disk, two ends of the compression spring are fixedly connected to the fixing member and the plug, respectively.

[0009] In one possible design, the fixing member includes a fixedly connected fixing portion and a spring mounting column, the fixing portion is used to be fixedly connected to the positioning portion, and the fixing portion is a hollow disc structure; the end of the compression spring away from the plug is sleeved on the spring mounting column.

[0010] In a possible design, the disk body is fixedly mounted with a plug lining, which is located at the edge of the pressure relief hole and is arranged around the pressure relief hole; the plug can abut against the plug lining when closing the pressure relief hole.

[0011] In a possible design, the positioning portion is a hollow cylindrical structure.

[0012] In a possible design, the positioning plate also includes a sealing portion fixedly connected to the positioning portion, and the sealing portion is used to open the water inlet and close the air inlet when water enters the valve body, and is also used to close the water inlet and open the air inlet when water stops entering the valve body; the pressure relief hole is arranged in the sealing portion.

[0013] In one possible design, an upper lining is installed on the side of the sealing portion close to the air inlet along the axial direction of the positioning plate, and the upper lining is used to abut against the edge of the air inlet when the sealing portion closes the air inlet; and / or, a lower lining is installed on the side of the sealing portion close to the water inlet along the axial direction of the positioning plate, and the lower lining is used to abut against the edge of the water inlet when the sealing portion closes the water inlet.

[0014] In a possible design, the sealing portion includes a fixedly connected sealing body and a lower lining mounting column, the lower lining is sleeved on the lower lining mounting column, and the pressure relief hole passes through the sealing body and the lower lining mounting column; the lower lining mounting column also has a limiting portion, and along the axial direction of the positioning plate, at least part of the lower lining is clamped between the sealing body and the limiting portion.

[0015] In this application, the positioning disc can play an anti-siphon role, preventing external sewage from flowing back into the valve body when the water intake stops, thereby polluting the clean water source inside the valve body. In addition, when water is entering the valve body, if the water flow pressure at the water inlet is greater than the preset value, the plug can move upward under the action of the water pressure to open the pressure relief hole. At this time, the water at the water inlet can flow to the air inlet through the pressure relief hole, thereby achieving the effect of pressure relief, preventing the solenoid valve from rupturing due to excessive pressure inside the solenoid valve, and also reducing the risk of the solenoid valve installation pipeline rupturing due to the high pressure inside the solenoid valve, which is beneficial to improving the safety of the solenoid valve and its installation pipeline, and extending the service life of the solenoid valve and its installation pipeline.

[0016] It should be understood that the foregoing general description and the following detailed description are merely illustrative and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of the solenoid valve provided in this application;

[0018] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the solenoid valve along the AA′ direction when the air inlet is closed;

[0019] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of the solenoid valve along the AA′ direction when the air inlet is open;

[0020] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of the solenoid valve when the plug opens the pressure relief hole;

[0021] Figure 5 for Figure 2 A schematic diagram of the structure of the positioning plate;

[0022] Figure 6 for Figure 5 A schematic diagram of the structure of the fixing parts;

[0023] Figure 7 for Figure 5 A schematic structural diagram of a portion of the positioning plate in another perspective;

[0024] Figure 8 for Figure 5 Schematic diagram of the structure of the disk;

[0025] Figure 9 for Figure 8 Schematic diagram of the structure of the disk from another perspective.

[0026] Reference numerals:

[0027] 1-valve body;

[0028] 11-air inlet;

[0029] 12-water inlet;

[0030] 13- air intake passage;

[0031] 14-water inlet channel;

[0032] 15-water outlet channel;

[0033] 2- Positioning plate;

[0034] 21-disc body;

[0035] 211-pressure relief hole;

[0036] 212- positioning unit;

[0037] 212a-pressure relief channel;

[0038] 212b- positioning column;

[0039] 212c-limited space;

[0040] 212d-through groove;

[0041] 213-blocking part;

[0042] 213a-blocking body;

[0043] 213b-lower lining mounting column;

[0044] 213ba-limiting part;

[0045] 213c-upper lining mounting column;

[0046] 213ca-groove;

[0047] 214- plug lining;

[0048] 215-upper lining;

[0049] 216-lower lining;

[0050] 22-plug;

[0051] 221-spring mounting slot;

[0052] 23-fixing parts;

[0053] 231-fixed part;

[0054] 232-spring mounting column;

[0055] 24-Compression spring.

[0056] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0057] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0058] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0059] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0060] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0061] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described based on the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should be understood that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also be indirectly connected to the other element "on" or "under" through an intermediate element.

[0062] The embodiment of the present application provides a solenoid valve, such as Figure 1 and Figure 2 As shown, the solenoid valve includes a valve body 1 and a positioning plate 2 located in the valve body 1. The valve body 1 includes an air inlet channel 13, a water inlet channel 14 and a water outlet channel 15. The valve body 1 has an air inlet 11 connected to the air inlet channel 13 and a water inlet 12 connected to the water inlet channel 14. Specifically, as Figure 2As shown, when water flows into the water inlet channel 14 and flows to the water inlet 12, the positioning plate 2 can float upward under the buoyancy of the water flow. At this time, the positioning plate 2 can open the water inlet 12 and close the air inlet 11 at the same time, thereby preventing water from flowing through the air inlet 11 to the air inlet channel 13, ensuring that all water can flow to the water outlet channel 15; Figure 3 As shown, when the water inlet channel 14 stops inflowing water, the positioning disk 2 can move downward and reset under the action of the air pressure in the air inlet channel 13, so that the water inlet 12 can be closed while the air inlet 11 is opened. At this time, the outside air can flow into the interior of the valve body 1 through the air inlet channel 13 and the air inlet 11, thereby preventing the siphon effect from occurring inside the valve body 1 and preventing the outside sewage from flowing back into the valve body 1 through the water outlet channel 15 and polluting the clean water source inside the valve body 1.

[0063] Furthermore, if Figure 2 As shown, the positioning plate 2 includes a plate body 21 and a plug 22. The plate body 21 is provided with a pressure relief hole 211, which is connected to the water inlet 12 and the air inlet 11 respectively. The plug 22 is movably installed in the plate body 21. When water enters the water inlet channel 14, if the water flow pressure at the water inlet 12 is less than a preset value, the plug 22 can seal the pressure relief hole 211 to keep the pressure relief hole 211 in a closed state. At this time, the connection between the air inlet 11 and the water inlet 12 is cut off by the plug 22, ensuring that the water flow at the water inlet 12 can stably flow to the water outlet channel 15; Figure 4 As shown, if the water flow pressure at the water inlet 12 is greater than the preset value, the plug 22 can move upward under the action of the water pressure to open the pressure relief hole 211. At this time, the air inlet 11 and the water inlet 12 are connected, and the water at the water inlet 12 can flow to the air inlet 11 through the pressure relief hole 211 and be discharged from the valve body 1 through the air inlet channel 13, thereby achieving the effect of pressure relief, preventing the solenoid valve from being ruptured due to excessive pressure inside the solenoid valve, and reducing the risk of the solenoid valve installation pipeline being ruptured due to the high pressure inside the solenoid valve, which is beneficial to improving the safety of the solenoid valve and its installation pipeline, and extending the service life of the solenoid valve and its installation pipeline.

[0064] It should be noted that the preset value of the water flow pressure refers to the safe pressure value of the solenoid valve and its installation pipeline during use, which is related to the usage scenario of the solenoid valve and the type of its installation pipeline. The user can adjust the preset value as needed. This embodiment does not limit the specific size of the preset value.

[0065] like Figure 2 and Figure 5As shown, the disc body 21 includes a fixedly connected positioning portion 212 and a blocking portion 213. When water is introduced into the valve body 1 through the water inlet channel 14, the blocking portion 213 can abut against the edge of the air inlet 11 when the positioning disc 2 floats up, so as to close the air inlet 11 while opening the water inlet 12; when the water inlet channel 14 stops introducing water into the valve body 1, the blocking portion 213 can abut against the edge of the water inlet 12 when the positioning disc 2 moves down, so as to close the water inlet 12 while opening the air inlet 11.

[0066] Along the axial direction of the positioning disk 2, the positioning portion 212 is located above the blocking portion 213. At least a portion of the positioning portion 212 extends into the air inlet channel 13 through the air inlet port 11 and can move in the air inlet channel 13. The inner wall of the air inlet channel 13 is used to cooperate with the positioning portion 212, which can limit and guide the positioning portion 212, thereby preventing the positioning disk 2 from shaking during the movement, which is beneficial to improving the stability of the positioning disk 2 during the movement process, and can also reduce the risk of the positioning disk 2 falling out of the air inlet channel 13.

[0067] It should be noted that if Figure 2 As shown, the air inlet passage 13 has a right-angle structure and includes a portion extending along the axial direction Z of the positioning plate 2 and a portion extending along the radial direction X of the positioning plate 2. The portion extending along the axial direction Z of the positioning plate 2 includes a section with a wider diameter that cooperates with the positioning portion 212 and a section with a narrower diameter located above the positioning portion 212. The portion extending along the axial direction Z of the positioning plate 2 is used to communicate with the outside world.

[0068] Specifically, the pressure relief hole 211 is provided in the blocking portion 213, and the positioning portion 212 is provided with a pressure relief channel 212a. The gap between the side wall of the positioning portion 212 and the plug 22 and the through groove 212d at the top of the positioning portion 212 together form the pressure relief channel 212a. The pressure relief channel 212a is respectively connected to the pressure relief hole 211 and the air inlet channel 13. The plug 22 is movably mounted on the positioning portion 212. Figure 4 As shown, when the water flow pressure at the water inlet 12 is greater than the preset value and the plug 22 opens the pressure relief hole 211, the pressure relief hole 211 can be connected to the air inlet channel 13 through the pressure relief channel 212a. At this time, the water flow at the water inlet 12 can flow to the outside through the pressure relief hole 211, the pressure relief channel 212a and the air inlet channel 13, thereby realizing the pressure relief process of the valve body 1.

[0069] like Figure 2 and Figure 5 As shown, the positioning disc 2 further includes a fixing member 23 and a compression spring 24. The fixing member 23 is fixedly connected to the positioning portion 212. Along the axial direction Z of the positioning disc 2, the two ends of the compression spring 24 are fixedly connected to the fixing member 23 and the plug 22 respectively. Figure 2As shown, when the water flow pressure at the water inlet 12 is less than a preset value, the plug 22 can seal the pressure relief hole 211 under the action of the compression spring 24; Figure 4 As shown, when the water pressure at the water inlet 12 is greater than a preset value, the plug 22 can move upward under the action of the water flow and compress the compression spring 24 to open the pressure relief hole 211. When the water pressure at the water inlet 12 decreases to less than the preset value or the water inlet channel 14 stops flowing, the plug 22 can move downward under the action of the restoring force of the compression spring 24 to reset and reseal the pressure relief hole 211, thus achieving automatic resetting of the plug 22. In particular, when the safety pressure value of the solenoid valve and its installation pipeline changes (i.e., the preset pressure value changes), the user can replace the compression spring 24 with a different specification so that the plug 22 can open the pressure relief hole 211 when the water pressure reaches the preset pressure value.

[0070] Specifically, if Figure 6 As shown, the fixing member 23 includes a fixedly connected fixing portion 231 and a spring mounting column 232. The fixing portion 231 is fixedly connected to the positioning portion 212. The end of the compression spring 24 away from the plug 22 is sleeved on the spring mounting column 232. The spring mounting column 232 can limit the compression spring 24 and prevent the compression spring 24 from deviating along the radial direction X of the positioning disk 2 when it moves. Figure 2 and Figure 7 As shown, the plug 22 is provided with a spring mounting groove 221, and the end of the compression spring 24 away from the fixing member 23 is located inside the spring mounting groove 221. The spring mounting groove 221 can also limit the compression spring 24 to prevent the compression spring 24 from deviating along the radial direction X of the positioning plate 2 when moving.

[0071] like Figure 6 As shown, the fixing portion 231 can be a hollowed-out disc structure, which helps reduce the weight of the fixing member 23, thereby reducing the overall weight of the positioning disk 2 and increasing the buoyancy of the positioning disk 2 in water. This in turn helps improve the sealing performance of the blocking portion 213 against the air inlet 11, thereby enhancing the anti-siphon effect of the positioning disk 2. Furthermore, when the fixing portion 213 is hollowed out, the water in the pressure relief channel 212a can also flow into the air inlet channel 13 through the hollowed-out portion of the fixing portion 231, which helps improve pressure relief efficiency.

[0072] like Figure 5 and Figure 7As shown, the positioning portion 212 is provided with a plurality of positioning posts 212b spaced apart along the circumference of the positioning portion 212. The positioning posts 212b protrude toward the center of the positioning portion 212 along the radial direction X of the positioning portion 212. A limiting space 212c is formed between the plurality of positioning posts 212b, and the plug 22 is movably mounted within the limiting space 212c. By providing the plurality of positioning posts 212b, the plug 22 can be limited in the radial direction X of the positioning portion 212, thereby improving the stability of the plug 22 during its upward and downward movement.

[0073] like Figure 5 As shown, the positioning portion 212 can be a hollow cylindrical structure. This can reduce the weight of the positioning plate 2 while ensuring the structural strength of the positioning portion 212, thereby increasing the buoyancy of the positioning plate 2 in the water flow and improving the anti-siphon effect of the positioning plate 2. In addition, the hollow structure of the positioning portion 212 can expand the cross-sectional area of ​​the pressure relief channel 212a, which is conducive to improving the efficiency and effect of pressure relief.

[0074] like Figure 2 、 Figure 3 and Figure 5 As shown, along the axial direction Z of the positioning disc 2, an upper lining 215 is installed on the side of the blocking portion 213 close to the air inlet 11. The upper lining 215 is used to abut against the edge of the air inlet 11 when the blocking portion 213 closes the air inlet 11, thereby improving the sealing between the blocking portion 213 and the air inlet 11. And / or, along the axial direction Z of the positioning disc 2, a lower lining 216 is installed on the side of the blocking portion 213 close to the water inlet 12. The lower lining 216 is used to abut against the edge of the water inlet 12 when the blocking portion 213 closes the water inlet 12, thereby improving the sealing between the blocking portion 213 and the water inlet 12.

[0075] Specifically, if Figure 8 As shown, the blocking portion 213 includes a blocking body 213a and an upper lining mounting column 213c fixedly connected to one end of the blocking body 213a close to the air inlet 11 along the axial direction Z of the blocking portion 213, and the upper lining 215 is sleeved on the upper lining mounting column 213c. At this time, the positioning portion 212 and the blocking body 213a can jointly limit the axial movement of the upper lining 215 along the axial direction Z of the positioning plate 2, thereby improving the installation reliability of the upper lining 215.

[0076] In addition, if Figure 9 As shown, the upper lining mounting post 213c is provided with a groove 213ca, combined with Figure 2 As shown, the bottom of the groove 213ca is connected to the pressure relief hole 211. A sealing lining 214 is installed in the groove 213ca. The sealing lining 214 is located at the edge of the pressure relief hole 211 and is arranged around the pressure relief hole 211. When the plug 22 closes the pressure relief hole 211, it can abut against the plug lining 214, thereby improving the sealing between the plug 22 and the pressure relief hole 211.

[0077] like Figure 8 As shown, the sealing portion 213 further includes a lower lining mounting post 213b fixedly connected to the end of the sealing body 213a near the water inlet 12 along the axial direction Z of the sealing portion 213. The lower lining 216 is sleeved on the lower lining mounting post 213b. The pressure relief hole 211 extends through the upper lining mounting post 213c, the sealing body 213a, and the lower lining mounting post 213b. The lower lining mounting post 213b further includes a limiting portion 213ba. Along the axial direction Z of the positioning plate 2, at least a portion of the lower lining 216 is clamped between the sealing body 213a and the limiting portion 213ba. The limiting portion 213ba and the sealing body 213a can jointly limit the movement of the lower lining 216 along the axial direction Z of the positioning plate 2, thereby improving the installation reliability of the lower lining 216.

[0078] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A solenoid valve, characterized in that: include: A valve body (1) having an air inlet (11) and a water inlet (12); a positioning disc (2) located in the valve body (1), the positioning disc (2) being used to open the water inlet (12) and close the air inlet (11) when water is flowing into the valve body (1), and also being used to close the water inlet (12) and open the air inlet (11) when water stops flowing into the valve body (1); The positioning disk (2) comprises a disk body (21) and a plug (22); the disk body (21) is provided with a pressure relief hole (211); the pressure relief hole (211) is respectively connected to the water inlet (12) and the air inlet (11); The plug (22) is movably mounted in the disk body (21), and the plug (22) is used to close the pressure relief hole (211) when the water flow pressure of the water inlet (12) is less than a preset value, so as to cut off the communication between the air inlet (11) and the water inlet (12); The plug (22) is also used to open the pressure relief hole (211) when the water flow pressure of the water inlet (12) is greater than a preset value, so as to connect the air inlet (11) and the water inlet (12).

2. The solenoid valve according to claim 1, characterized in that The valve body (1) further comprises an air inlet passage (13) communicating with the air inlet (11); the disc body (21) comprises a positioning portion (212); at least a portion of the positioning portion (212) extends into the air inlet passage (13) through the air inlet (11); When the positioning portion (212) moves in the air intake channel (13), the inner wall of the air intake channel (13) is used to guide the movement of the positioning portion (212) and to prevent the positioning portion (212) from falling out of the air intake channel (13); The positioning portion (212) is provided with a pressure relief channel (212a), and the pressure relief channel (212a) is respectively communicated with the pressure relief hole (211) and the air intake channel (13); The plug (22) is movably mounted on the positioning portion (212); when the plug (22) opens the pressure relief hole (211), water from the water inlet (12) can flow toward the air inlet channel (13) through the pressure relief hole (211) and the pressure relief channel (212a).

3. The solenoid valve according to claim 2, characterized in that The positioning portion (212) is provided with a plurality of positioning posts (212b) spaced apart along the circumference of the positioning portion (212), and the positioning posts (212b) protrude toward the center of the positioning portion (212) along the radial direction of the positioning portion (212); A limiting space (212c) is formed between the plurality of positioning columns (212b), and the plug (22) is movably installed in the limiting space (212c).

4. The solenoid valve according to claim 2, characterized in that The positioning disc (2) further comprises a fixing member (23) and a compression spring (24), wherein the fixing member (23) is fixedly connected to the disc body (21); Along the axial direction of the positioning disk (2), the two ends of the compression spring (24) are fixedly connected to the fixing member (23) and the plug (22) respectively.

5. The solenoid valve according to claim 4, characterized in that The fixing member (23) comprises a fixedly connected fixing portion (231) and a spring mounting column (232), wherein the fixing portion (231) is used for fixedly connecting with the positioning portion (212), and the fixing portion (231) is a hollow disc structure; One end of the compression spring (24) away from the plug (22) is sleeved on the spring mounting post (232).

6. The solenoid valve according to claim 1, characterized in that The disk body (21) is fixedly mounted with a plug lining (214), and the plug lining (214) is located at the edge of the pressure relief hole (211) and is arranged around the pressure relief hole (211); The plug (22) can abut against the plug lining (214) when closing the pressure relief hole (211).

7. The solenoid valve according to claim 2, characterized in that The positioning portion (212) is a hollow cylindrical structure.

8. The solenoid valve according to claim 2, characterized in that The positioning plate (2) further comprises a blocking portion (213) fixedly connected to the positioning portion (212), the blocking portion (213) being used to open the water inlet (12) and close the air inlet (11) when water is flowing into the valve body (1), and also being used to close the water inlet (12) and open the air inlet (11) when water stops flowing into the valve body (1); The pressure relief hole (211) is provided on the blocking portion (213).

9. The solenoid valve according to claim 8, characterized in that An upper lining (215) is installed on the side of the blocking portion (213) close to the air inlet (11) along the axial direction of the positioning disk (2), and the upper lining (215) is used to abut against the edge of the air inlet (11) when the blocking portion (213) closes the air inlet (11); And / or, along the axial direction of the positioning plate (2), a lower lining (216) is installed on the side of the sealing portion (213) close to the water inlet (12), and the lower lining (216) is used to abut against the edge of the water inlet (12) when the sealing portion (213) closes the water inlet (12).

10. The solenoid valve according to claim 8, characterized in that The blocking portion (213) comprises a blocking body (213a) and a lower lining installation column (213b) that are fixedly connected; the lower lining (216) is sleeved on the lower lining installation column (213b); and the pressure relief hole (211) passes through the blocking body (213a) and the lower lining installation column (213b); The lower lining installation column (213b) also has a limiting portion (213ba), and along the axial direction of the positioning plate (2), at least a portion of the lower lining (216) is clamped between the blocking body (213a) and the limiting portion (213ba).

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