solenoid valve

Abstract

The present invention discloses a solenoid valve including a valve cover (60), a valve core (20) attached within the valve cover (60), a first sealing structure (43) and a sealing sleeve (42), the sealing sleeve (42) being attached to one end of the valve cover (60) and the first sealing structure (43) being provided at one end of the sealing sleeve (42) adjacent to the valve cover (60) to form a valve opening (41), and a drive assembly (30) for driving the valve core (20) to move it along the axial direction to open and close the valve opening (41), and having a hardness difference between the part of the first sealing structure that engages with the valve core and the valve core, thereby solving the problem in the prior art that medium leakage is likely to occur at the valve opening when the valve core seals the valve opening.

Description

[Technical Field]

[0001] FIELD OF THE INVENTION This application relates to the technical field of solenoid valves, and more particularly to solenoid valves. [Background technology]

[0002] Currently, during the operation of a solenoid valve, the valve core has a non-communicating state that blocks the valve port and a communicating state that bypasses the valve port.

[0003] However, in the prior art, when the valve core seals the valve port, the valve core and the valve port come into strong contact with each other, causing leakage of the medium at the valve port, which affects the operational reliability of the solenoid valve. Summary of the Invention

[0004] The main object of the present application is to provide a solenoid valve that solves the problem in the prior art that medium leakage is likely to occur at the valve port when the valve core seals the valve port.

[0005] To achieve the above object, the present application provides a solenoid valve including a valve cover and a valve core attached within the valve cover, a first sealing structure and a sealing sleeve, wherein the sealing sleeve is attached to one end of the valve cover and the first sealing structure is provided at one end of the sealing sleeve adjacent to the valve cover to form a valve port, and a drive assembly that drives the valve core to move it axially to open and close the valve port, and wherein there is a hardness difference between the valve core and the portion of the first sealing structure that engages with the valve core.

[0006] When the technical aspects of the present application are applied, a soft seal is formed between the valve core and the first sealing structure, which seals the connection between the valve core and the valve port, and prevents the medium that has entered the valve port from leaking through the connection between the valve core and the valve port, which could affect the operational reliability of the solenoid valve. This solves the problem in prior art that medium leakage is likely to occur at the valve port when the valve core seals the valve port.

[0007] Preferably, the hardness of the first sealing structure is less than the hardness of the valve core so that a soft seal is formed.

[0008] Preferably, the hardness of the valve core is less than the hardness of the first sealing structure so that a soft seal is formed.

[0009] Preferably, the hardness of the first sealing structure is less than the hardness of the sealing sleeve.

[0010] Preferably, the first sealing structure is made of one of rubber, silica gel and plastic.

[0011] Preferably, the first sealing structure is limited between the valve cover and the sealing sleeve, and the valve cover includes a valve cover body, an annular plate provided on the side of the valve cover body away from the drive assembly and abutting the sealing sleeve, and an annular step provided on the inner surface of the annular plate and abutting the first sealing structure, wherein an installation space is formed between the annular step and the annular plate, and the first sealing structure is provided within the installation space.

[0012] Preferably, the valve orifice includes a first hole segment and a second hole segment connected to each other, the first hole segment is connected to the internal cavity of the sealing sleeve via the second hole segment, and the first hole segment is a tapered hole, and the inner diameter of the tapered hole gradually decreases along the direction from the first sealing structure to the sealing sleeve.

[0013] Preferably, the drive assembly includes a first magnetic attraction structure and a second magnetic attraction structure, the valve core is connected to one end of the first magnetic attraction structure remote from the second magnetic attraction structure, a through hole is provided in the first magnetic attraction structure, and a balancing hole is provided in the valve core, and the balancing hole is connected to the through hole.

[0014] Preferably, the balancing hole includes a first segment proximate the through hole and a second segment distal to the through hole, the second segment having a larger inner diameter than the first segment.

[0015] Preferably, the solenoid valve further includes a valve seat having a mounting passage and a flow passage, the valve cover, the sealing sleeve and the first sealing structure all being mounted in the mounting passage.

[0016] Preferably, the solenoid valve further includes a second sealing structure provided between the sealing sleeve and the valve seat, or a third sealing structure provided between the valve cover and the valve seat, or the second sealing structure and the third sealing structure, wherein the second sealing structure is provided between the sealing sleeve and the valve seat, and the third sealing structure is provided between the valve cover and the valve seat.

[0017] Preferably, the sealing sleeve includes a sealing sleeve body and an annular protrusion provided on the outer peripheral surface of the sealing sleeve body, the annular protrusion having an annular groove, and the second sealing structure provided in the annular groove.

[0018] Preferably, when the first sealing structure is provided at one end of the sealing sleeve adjacent to the valve cover to form the valve port, the first sealing structure is provided with a first engagement portion, the valve core is provided with a second engagement portion, one of the first engagement portion and the second engagement portion is a first protrusion, and the other of the first engagement portion and the second engagement portion is a first recess, and the first protrusion enters into the first recess and is restrictively engaged with the first recess. [Brief explanation of the drawings]

[0019] The drawings in the specification that form a part of this application are intended to provide a further understanding of the application, and the schematic examples and descriptions thereof are intended to aid in the interpretation of the application and are not intended to unduly limit the application.

[0020] [Figure 1] 1 shows a cross-sectional view of a first embodiment of a solenoid valve according to the present application. [Figure 2] 2 shows an enlarged schematic diagram of the solenoid valve at A in FIG. 1.

[0021] Here, the above drawings include the following reference numerals: 10 valve seat, 11 valve chamber, 12 first through hole, 13 second through hole, 20 valve core, 21 balancing hole, 30 drive assembly, 31 first magnetic attraction structure, 32 second magnetic attraction structure, 41 valve port, 431 first hole segment, 432 second hole segment, 42 sealing sleeve, 421 sealing sleeve body, 422 annular protrusion, 4221 annular groove, 43 first sealing structure, 50 second sealing structure, 60 valve cover, 61 annular plate, 62 annular step, 63 valve cover body, 64 radial communicating hole, 70 third sealing structure, 80 spring. DETAILED DESCRIPTION OF THE INVENTION

[0022] It should be noted that, unless contradictory, the embodiments and features in the embodiments in the present application can be combined with each other. The present application will be described in detail below in conjunction with the embodiments with reference to the drawings.

[0023] Unless otherwise explained, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0024] In this application, unless otherwise specified, directional terms such as "upper, lower" used generally refer to the direction shown in the drawings or to the vertical, perpendicular, or gravitational direction. Similarly, for ease of understanding and explanation, "left, right" generally refer to the left, right, and "inner, outer" refer to the inner, outer sides of the contours of each component itself, but the above directional terms are not intended to limit the application.

[0025] The present application provides a solenoid valve that solves the problem in the prior art that medium leakage is likely to occur at the valve port when the valve core seals the valve port.

[0026] Example 1 1 and 2, the solenoid valve includes a valve cover 60, a valve core 20, a first sealing structure 43, a sealing sleeve 42, and a drive assembly 30. The valve core 20 is mounted in the valve cover 60. The sealing sleeve 42 is mounted at one end of the valve cover 60, and the first sealing structure 43 is provided at one end of the sealing sleeve 42 adjacent to the valve cover 60 to form a valve port 41. The drive assembly 30 drives the valve core 20 to move axially and open or close the valve port 41. There is a difference in hardness between the portion of the first sealing structure 43 that engages with the valve core 20 and the valve core 20.

[0027] When the technical aspect of this embodiment is applied, a soft seal is formed between the valve core 20 and the first sealing structure 43, which seals the connection between the valve core 20 and the valve port 41. This prevents any medium that has entered the valve port 41 from leaking through the connection between the valve core 20 and the valve port 41 and affecting the operational reliability of the solenoid valve. This solves the problem in the prior art that medium leakage is likely to occur at the valve port when the valve core seals the valve port.

[0028] In this embodiment, the hardness of the first sealing structure 43 is lower than that of the valve core 20, so as to form a soft seal. In this way, the above design ensures soft contact between the first sealing structure 43 and the valve core 20, further reducing structural wear between the first sealing structure 43 and the valve core 20 and extending the service life of the solenoid valve. At the same time, the above design reduces the impact force between the first sealing structure 43 and the valve core 20 when the valve core 20 moves toward the first through-hole 12, preventing structural damage to the first sealing structure 43 and the valve core 20.

[0029] It should be noted that the hardness relationship between the first sealing structure 43 and the valve core 20 is not limited thereto, and can be adjusted according to the working conditions and usage requirements.

[0030] In other embodiments not shown in the drawings, the hardness of the valve core is lower than that of the first sealing structure to form a soft seal. This design allows for soft contact between the first sealing structure and the valve core, further reducing structural wear between the first sealing structure and the valve core and extending the service life of the solenoid valve. At the same time, this design reduces the impact force between the first sealing structure and the valve core as the valve core moves toward the first through-hole, preventing structural damage to the first sealing structure and the valve core.

[0031] In this embodiment, the hardness of the first sealing structure 43 is less than that of the sealing sleeve 42. As such, the above design allows the first sealing structure 43 and the sealing sleeve 42 to make contact softer, further reducing structural wear between the first sealing structure 43 and the sealing sleeve 42 and extending the service life of the first sealing structure 43. At the same time, the above design reduces the impact force between the first sealing structure 43 and the sealing sleeve 42 during the movement of the valve core 20 toward the first through-hole 12, thereby preventing structural damage to the first sealing structure 43 and the sealing sleeve 42.

[0032] As shown in FIG. 1 , the valve seat 10 has a flow passage and further includes a first through-hole 12 and a second through-hole 13, both of which are connected to the flow passage. The valve core 20 is movably mounted in the flow passage and is used to control the connection and disconnection of the first through-hole 12 and the second through-hole 13. The drive assembly 30 includes a first magnetic attraction structure 31 and a second magnetic attraction structure 32. The valve core 20 is connected to one end of the first magnetic attraction structure 31 remote from the second magnetic attraction structure 32. The first magnetic attraction structure 31 has a through-hole, and the valve core 20 has a balancing hole 21 that is connected to the through-hole. In this way, the through-hole is connected to the valve port 41 through the balancing hole 21. When the medium enters the valve port 41, it quickly flows into the through-hole through the balancing hole 21, effectively balancing the pressure difference across the valve core 20.

[0033] Specifically, when the drive assembly 30 is in the second state, a first sealing structure 43 is provided between the valve core 20 and the first through hole 12. The first sealing structure 43 seals the connection between the valve core 20 and the first through hole 12, preventing any medium that has entered the first through hole 12 from leaking into the second through hole 13 via the connection between the valve core 20 and the first through hole 12 and affecting the operational reliability of the solenoid valve. This solves the problem of medium leakage from the valve port when the valve core 20 seals the valve port in the prior art. At the same time, when the drive assembly 30 is in the first state, the first through hole 12 is connected to the second through hole 13 via the valve port 41 of the first sealing structure 43, ensuring that the medium can flow into the second through hole 13 via the first through hole 12.

[0034] Optionally, the valve core 20 and the first magnetic attraction structure 31 may be separate structures or an integral structure. In this way, the above design makes the processing method of the valve core 20 and the first magnetic attraction structure 31 more flexible, not only meeting different application requirements and working conditions, but also improving the processing flexibility of the operator.

[0035] In this embodiment, the balancing hole 21 includes a first segment close to the through hole and a second segment farther from the through hole, and the inner diameter of the second segment is larger than that of the first segment. Thus, the above design realizes the balancing function within a large diameter, and the inner diameter of the second segment can be adjusted according to the flow requirement of the valve port.

[0036] 1, the solenoid valve further includes a valve seat 10. The valve seat 10 has an attachment passage and a flow passage, and the valve cover 60, the sealing sleeve 42, and the first sealing structure 43 are all attached to the attachment passage. This design makes the attachment and detachment of the solenoid valve easier and simpler, reducing the difficulty of attachment and detachment, and also realizes a compact design of the solenoid valve, reducing the overall space occupied by the solenoid valve.

[0037] Optionally, the first sealing structure 43 is made of one of rubber, silica gel, and plastic. Thus, the above design allows for more diversified material selection for the first sealing structure 43 to meet different usage requirements and working conditions. Specifically, the first sealing structure 43 is made of PTFE, which provides wear resistance and soft sealing.

[0038] In this embodiment, the first sealing structure 43 is provided on and connected to the sealing sleeve 42. As such, the first sealing structure 43 is fixed to the sealing sleeve 42. When the actuator assembly 30 is in the second state, the valve core 20 abuts against the first sealing structure 43, and the medium that has entered the first through-hole 12 enters the valve chamber 11 through the valve port 41. The above design of the first sealing structure 43 prevents the medium from leaking at the connection between the first sealing structure 43 and the valve core 20 and into the second through-hole 13, and further improves the sealing reliability of the solenoid valve.

[0039] 2, the valve orifice 41 includes a first hole segment 431 and a second hole segment 432 connected to each other, and the first hole segment 431 is connected to the internal cavity of the sealing sleeve 42 via the second hole segment 432. Here, the first hole segment 431 is a tapered hole, and the inner diameter of the tapered hole gradually decreases along the direction from the first sealing structure 43 to the sealing sleeve 42. In this way, the above design simplifies the operation of the valve core 20 entering the first hole segment 431, allows the valve core 20 to seal the first hole segment 431, and further ensures that the drive assembly 30 is in the second state. Here, when the drive assembly 30 is in the second state, at least a portion of the valve core 20 enters the tapered hole and abuts against the hole wall of the tapered hole.

[0040] Specifically, the central axes of the first hole segment 431 and the second hole segment 432 are coaxial, and when the drive assembly 30 is in the second state, at least a portion of the valve core 20 enters the tapered hole and abuts against the inner wall of the tapered hole. When the medium enters the first through hole 12, it can enter the valve chamber 11 through the sealing sleeve 42 and the first sealing structure 43. However, since the valve core 20 seals the first hole segment 431, the medium cannot enter the second through hole 13 through the connection between the first sealing structure 43 and the valve core 20.

[0041] Alternatively, the solenoid valve may further include a second sealing structure 50, which is disposed between the sealing sleeve 42 and the valve seat 10; or the solenoid valve may further include a third sealing structure 70, which is disposed between the valve cover 60 and the valve seat 10; or the solenoid valve may further include a second sealing structure 50 and a third sealing structure 70, which is disposed between the sealing sleeve 42 and the valve seat 10, and the third sealing structure 70 is disposed between the valve cover 60 and the valve seat 10.

[0042] As shown in FIG. 1 , the solenoid valve further includes a second sealing structure 50. The second sealing structure 50 is disposed between the sealing sleeve 42 and the valve seat 10. The second sealing structure 50 is made of rubber or silica gel. The second sealing structure 50 seals the connection between the first sealing structure 43 and the valve chamber 11, preventing the medium in the first through-hole 12 from entering the connection between the second sealing structure 50 and the valve chamber 11, further improving the sealing performance of the solenoid valve. At the same time, the above design simplifies the structure of the second sealing structure 50, making it easier to process and achieve, thereby reducing the manufacturing costs of the second sealing structure 50.

[0043] Optionally, the second sealing structure 50 is a sealing ring.

[0044] As shown in FIG. 1, the valve cover 60 has a radial communication hole 64 that communicates with the second through-hole 13, thereby ensuring that the medium can flow smoothly within the solenoid valve.

[0045] 1, the solenoid valve further includes a third sealing structure 70, which is provided between the valve cover 60 and the valve seat 10. In this manner, the third sealing structure 70 is used to seal the upper part of the radial communicating hole 64, and prevents the medium from leaking from this portion.

[0046] 1 , the sealing sleeve 42 includes a sealing sleeve body 421 and an annular protrusion 422 provided on the outer circumferential surface of the sealing sleeve body 421. The annular protrusion 422 has an annular groove 4221, and the second sealing structure 50 is provided in the annular groove 4221. As such, the above design makes it easier and simpler to attach and detach the second sealing structure 50 and the sealing sleeve 42, reducing the difficulty of attaching and detaching them. At the same time, the above design makes the structure of the sealing sleeve 42 simpler and easier to process, thereby reducing the processing costs of the sealing sleeve 42.

[0047] 1 , the first sealing structure 43 is limited between the valve cover 60 and the sealing sleeve 42, and the valve cover 60 includes a valve cover body 63, an annular plate 61, and an annular step 62. Here, the annular plate 61 is provided on the side of the valve cover body 63 away from the drive assembly 30 and abuts against the sealing sleeve 42. The annular step 62 is provided on the inner surface of the annular plate 61 and abuts against the first sealing structure 43. An installation space is formed between the annular step 62 and the annular plate 61, and the first sealing structure 43 is installed in the installation space. In this way, the first sealing structure 43 is attached to the sealing sleeve 42 via the valve cover 60, which facilitates and simplifies replacement and installation / removal of the first sealing structure 43, reducing the difficulty of installation / removal.

[0048] Specifically, the central axes of the annular plate 61 and the annular step 62 are arranged coaxially, and the annular step 62 is arranged pressed against the first sealing structure 43 so that the first sealing structure 43 is pressed against the sealing sleeve 42, thereby further preventing the medium from entering the connection portion between the first sealing structure 43 and the sealing sleeve 42.

[0049] As shown in FIG. 1, the solenoid valve further includes a spring 80, which is disposed between the first magnetic attraction structure 31 and the second magnetic attraction structure 32.

[0050] Optionally, the first sealing structure 43 is provided with a first engaging portion, and the valve core 20 is provided with a second engaging portion, one of which is a first protrusion and the other of which is a first recess, and the first protrusion enters and is restrictively engaged with the first recess. Thus, the above design of the first engaging portion and the second engaging portion improves the sealing reliability between the first sealing structure 43 and the valve core 20 and prevents medium leakage from the valve port 41.

[0051] In this embodiment, the first engagement portion is a first protrusion, and the second engagement portion is a first recess.

[0052] It should be noted that the structures of the first and second engaging portions are not limited thereto and can be adjusted according to working conditions and usage requirements. Optionally, the first engaging portion is a first recess and the second engaging portion is a first protrusion.

[0053] Example 2 The solenoid valve in the second embodiment is different from that in the first embodiment in that the first sealing structure 43 is disposed at a different position.

[0054] In this embodiment, the first sealing structure is provided on the valve core and connected to the valve core, thus the above design makes the placement position of the first sealing structure more flexible, not only meeting different usage requirements and working conditions, but also making the processing more flexible for operators.

[0055] In this embodiment, when the drive assembly is in the second state, the surface of the first sealing structure facing the sealing sleeve and the surface of the sealing sleeve facing the first sealing structure are designed to be in close contact with each other, which prevents the medium from entering the contact surface between the first sealing structure and the sealing sleeve and further prevents the medium from entering the second through-hole, thereby avoiding leakage in the solenoid valve.

[0056] Optionally, a third engagement portion is provided on the first sealing structure 43, and a fourth engagement portion is provided on the inner wall of the valve port 41, one of the third engagement portion and the fourth engagement portion is a second protrusion, and the other of the third engagement portion and the fourth engagement portion is a second recess, and the first protrusion enters and is limit-engaged with the second recess. Thus, the above design of the third engagement portion and the fourth engagement portion improves the sealing reliability between the first sealing structure 43 and the valve core 20 and prevents medium leakage from the valve port 41.

[0057] In this embodiment, the third engagement portion is the second protrusion, and the fourth engagement portion is the second recess.

[0058] It should be noted that the structures of the third and fourth engaging portions are not limited thereto and can be adjusted according to the working conditions and usage requirements. Optionally, the third engaging portion is the second recess and the fourth engaging portion is the second protrusion.

[0059] As can be seen from the above description, the above embodiments of the present application achieve the following technical effects. A soft seal is formed between the valve core and the first sealing structure, which seals the connection between the valve core and the valve orifice, and prevents any medium that has entered the valve orifice from leaking through the connection between the valve core and the valve orifice, thereby affecting the operational reliability of the solenoid valve. This solves the problem in prior art that medium leakage is likely to occur at the valve orifice when the valve core seals the valve orifice.

[0060] It is clear that the above-mentioned embodiments are only some of the embodiments of the present application, and are not all of the embodiments. Based on the embodiments in the present application, any other embodiments that can be obtained by a person skilled in the art without creative efforts should fall within the scope of protection of the present application.

[0061] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present application. As used herein, the singular also intends to include the plural unless the context clearly dictates otherwise, and it should also be understood that when the terms "comprise" and / or "comprises" are used herein, it means that features, steps, operations, devices, assemblies, and / or combinations thereof are present.

Claims

1. a valve cover (60) and a valve core (20) mounted in the valve cover (60); a first sealing structure (43) and a sealing sleeve (42), the sealing sleeve (42) being attached to one end of the valve cover (60), the first sealing structure (43) being provided at one end of the sealing sleeve (42) adjacent to the valve cover (60) and forming a valve port (41); a drive assembly (30) that drives the valve core (20) to move along the axial direction to open and close the valve port (41); a hardness difference is provided between the valve core (20) and a portion of the first sealing structure (43) that is engaged with the valve core (20); The first sealing structure (43) is confined between the valve cover (60) and the sealing sleeve (42), and the valve cover (60) A valve cover body (63), an annular plate (61) provided on the side of the valve cover body (63) away from the drive assembly (30) and abutting against the sealing sleeve (42); an annular step (62) provided on the inner surface of the annular plate (61) and abutting against the first sealing structure (43), wherein an installation space is formed between the annular step (62) and the annular plate (61), and the first sealing structure (43) is provided within the installation space.

2. A valve cover (60) and a valve core (20) attached within the valve cover (60), a first sealing structure (43) and a sealing sleeve (42), the sealing sleeve (42) being attached to one end of the valve cover (60), the first sealing structure (43) being provided at one end of the sealing sleeve (42) adjacent to the valve cover (60) and forming a valve port (41); a drive assembly (30) that drives the valve core (20) to move along the axial direction to open and close the valve port (41); a hardness difference is provided between the valve core (20) and a portion of the first sealing structure (43) that is engaged with the valve core (20); The valve port (41) includes a first hole segment (431) and a second hole segment (432) connected to each other, the first hole segment (431) is connected to an internal cavity of the sealing sleeve (42) via the second hole segment (432), and the first hole segment (431) is a tapered hole, and the inner diameter of the tapered hole gradually decreases along the direction from the first sealing structure (43) to the sealing sleeve (42).

3. A valve cover (60) and a valve core (20) attached within the valve cover (60), a first sealing structure (43) and a sealing sleeve (42), the sealing sleeve (42) being attached to one end of the valve cover (60), the first sealing structure (43) being provided at one end of the sealing sleeve (42) adjacent to the valve cover (60) and forming a valve port (41); a drive assembly (30) that drives the valve core (20) to move along the axial direction to open and close the valve port (41); a hardness difference is provided between the valve core (20) and a portion of the first sealing structure (43) that is engaged with the valve core (20); The drive assembly includes a first magnetic attraction structure (31) and a second magnetic attraction structure (32), the valve core (20) is connected to one end of the first magnetic attraction structure (31) remote from the second magnetic attraction structure (32), a through hole is provided in the first magnetic attraction structure (31), and a balancing hole (21) is provided in the valve core (20), and the balancing hole (21) is connected to the through hole.

4. A valve cover (60) and a valve core (20) attached within the valve cover (60), a first sealing structure (43) and a sealing sleeve (42), the sealing sleeve (42) being attached to one end of the valve cover (60), the first sealing structure (43) being provided at one end of the sealing sleeve (42) adjacent to the valve cover (60) and forming a valve port (41); a drive assembly (30) that drives the valve core (20) to move along the axial direction to open and close the valve port (41); a hardness difference is provided between the valve core (20) and a portion of the first sealing structure (43) that is engaged with the valve core (20); An electromagnetic valve, wherein the first sealing structure (43) is provided with a first engagement portion, the valve core (20) is provided with a second engagement portion, one of the first engagement portion and the second engagement portion is a first protrusion, the other of the first engagement portion and the second engagement portion is a first recess, and the first protrusion enters into the first recess and is limitedly engaged with the first recess.

5. 5. The solenoid valve according to claim 1, wherein the hardness of the first sealing structure (43) is lower than the hardness of the valve core (20) so that a soft seal is formed.

6. 5. The solenoid valve according to claim 1, wherein the hardness of the valve core (20) is lower than the hardness of the first sealing structure (43) so that a soft seal is formed.

7. 5. The solenoid valve according to claim 1, wherein the hardness of the first sealing structure (43) is less than the hardness of the sealing sleeve (42).

8. 5. The solenoid valve according to claim 1, wherein the first sealing structure (43) is made of one of rubber, silica gel and plastic.

9. 4. The solenoid valve according to claim 3, wherein the balancing hole (21) includes a first segment adjacent to the through hole and a second segment distant from the through hole, and the inner diameter of the second segment is larger than that of the first segment.

10. 5. The solenoid valve of claim 1, further comprising a valve seat (10) having a mounting passage and a flow passage, wherein the valve cover (60), the sealing sleeve (42), and the first sealing structure (43) are all mounted in the mounting passage.

11. a second sealing structure (50) provided between the sealing sleeve (42) and the valve seat (10); or a third sealing structure (70) provided between the valve cover (60) and the valve seat (10); or 11. The solenoid valve according to claim 10, further comprising a second sealing structure (50) and a third sealing structure (70), wherein the second sealing structure (50) is provided between the sealing sleeve (42) and the valve seat (10), and the third sealing structure (70) is provided between the second sealing structure (50), the valve lid (60), and the valve seat (10).

12. The solenoid valve of claim 11, wherein the sealing sleeve (42) includes a sealing sleeve body (421) and an annular protrusion (422) provided on the outer peripheral surface of the sealing sleeve body (421), the annular protrusion (422) has an annular groove (4221), and the second sealing structure (50) is provided in the annular groove (4221).

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