An electromagnetic valve

Abstract

The application discloses an electromagnetic valve, which comprises a valve body, a valve cover, a first valve port seat, a mounting hole, a mounting hole port, a convex part, a circular ring, a first end part and a contact area. The convex part is arranged on one of the valve cover and the first valve port seat and protrudes in the axial direction of the valve cover. The convex part is in the form of a circular ring and is arranged around the mounting hole port. The first end part is arranged on the other one of the valve cover and the first valve port seat. The convex part is in contact with the first end part in the axial direction of the valve cover. The electromagnetic valve provided by the application can realize the contact between the valve cover and the first valve port seat by the contact between the convex part and the first end part during the rotation of the valve cover into the valve body, thereby reducing the contact area between the valve cover and the first valve port seat, reducing the possibility that the first valve port seat is driven to rotate greatly by the valve cover under the action of friction, reducing the possibility that the communication channel of the first valve port seat is dislocated from the first flow channel of the valve body, and guaranteeing the medium flow performance of the electromagnetic valve.

Description

Technical Field

[0001] This utility model relates to the field of flow path control technology, specifically to a solenoid valve. Background Technology

[0002] Figure 1 The diagram shown is a structural schematic of a solenoid valve in related technologies. Figure 1 As shown, the solenoid valve includes a valve seat 1', an end cap 2', and a valve port seat 3'. The valve port seat 3' includes a first flow channel hole 31', and the valve seat 1' includes a second flow channel hole 11'. The end cap 2' is threadedly connected to the valve body 1'. The valve port seat 3' is fixed inside the valve seat 1' by the axial compressive force generated when the end cap 2' is tightened, ensuring that the first flow channel 31' and the second flow channel 11' are aligned and connected, allowing the medium to flow into or out of the valve seat 1'. During installation, the valve port seat 3' of the above-mentioned solenoid valve will contact and rub against the end cap 2' during tightening. Due to the large contact area, the valve port seat 3' is prone to rotate with the end cap 2', resulting in misalignment between the first flow channel hole 31' and the second flow channel hole 11', affecting the flow performance of the medium inside the solenoid valve. Therefore, this solenoid valve has room for improvement. Utility Model Content

[0003] The purpose of this application is to provide a solenoid valve, including a valve body, a valve cover, and a first valve seat. The valve body includes a mounting hole and a first flow channel. The valve cover is partially located in the mounting hole and is threadedly connected to the valve body. The first valve seat is located in the mounting hole and is at least partially located below the valve cover. The first valve seat includes a communicating channel connected to the first flow channel. The mounting hole includes a mounting opening. One of the valve cover and the first valve seat includes a protrusion that protrudes axially from the valve cover. The protrusion is annular and surrounds the mounting opening. The other of the valve cover and the first valve seat includes a first end portion. The protrusion and the first end portion abut against each other axially in the valve cover. On the same cross-section of the protrusion, the maximum outer diameter of the protrusion is defined as D1, and the minimum inner diameter of the protrusion is defined as D2, satisfying 0.1D2≤D1-D2≤0.36D2.

[0004] The solenoid valve of this application has a protrusion and a first end. The protrusion is annular and surrounds the mounting hole. During the process of screwing the valve cover into the valve body, the protrusion and the first end abut against each other to achieve contact between the valve cover and the first valve seat. This reduces the contact area between the valve cover and the first valve seat, and reduces the possibility that the first valve seat will be driven by the valve cover component to rotate significantly under the action of friction. This further reduces the possibility of misalignment between the connecting channel of the first valve seat and the first flow channel of the valve body, and ensures the medium flow performance of the solenoid valve.

[0005] This application also provides a solenoid valve, including a valve body, a valve cover, and a first valve seat. The valve body includes a mounting hole and a first flow channel. The valve cover is partially located in the mounting hole and is threadedly connected to the valve body. The first valve seat is located in the mounting hole and is at least partially located below the valve cover. The first valve seat includes a communicating channel connected to the first flow channel. The mounting hole includes a mounting opening. One of the valve cover and the first valve seat includes a protrusion that protrudes axially from the valve cover and is dot-shaped. The protrusion surrounds the mounting opening. The other of the valve cover and the first valve seat includes a first end portion, and the protrusion abuts against the first end portion axially in the valve cover.

[0006] The solenoid valve of this application has a protruding part and a first end. The protruding part is in the shape of a raised dot and is arranged around the mounting hole. During the process of screwing the valve cover into the valve body, the protruding part and the first end abut against each other to achieve contact between the valve cover and the first valve seat. This reduces the contact area between the valve cover and the first valve seat, reduces the possibility that the first valve seat will be driven by the valve cover component to rotate significantly under the action of friction, and further reduces the possibility of misalignment between the connecting channel of the first valve seat and the first flow channel of the valve body, thus ensuring the medium flow performance of the solenoid valve. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of a solenoid valve in related technologies;

[0008] Figure 2 A schematic cross-sectional view of an example solenoid valve provided in this application;

[0009] Figure 3 for Figure 2 A three-dimensional schematic diagram of a solenoid valve from a first-person perspective;

[0010] Figure 4 for Figure 2 A three-dimensional schematic diagram of the solenoid valve from a second-view perspective;

[0011] Figure 5 for Figure 2 A schematic diagram at point A in the middle;

[0012] Figure 6 for Figure 2 A schematic diagram at point B in the middle;

[0013] Figure 7 for Figure 2 A cross-sectional schematic diagram of the first valve seat in one example;

[0014] Figure 8 for Figure 7A three-dimensional schematic diagram of the first valve seat from a first-view perspective;

[0015] Figure 8A for Figure 2 The image also shows a three-dimensional schematic diagram of an example of a first valve seat;

[0016] Figure 9 for Figure 7 A three-dimensional schematic diagram of the first valve seat from a second perspective;

[0017] Figure 10 for Figure 2 A three-dimensional schematic diagram of a valve cover as an example;

[0018] Figure 11 for Figure 2 A three-dimensional schematic diagram of the first valve seat in another example;

[0019] Figure 12 for Figure 2 The image also shows a three-dimensional schematic diagram of an example valve cover;

[0020] Figure 12A for Figure 2 A three-dimensional schematic diagram of another example of a valve cover;

[0021] Figure 13 for Figure 2 A schematic diagram at point C in the middle;

[0022] Figure 14 for Figure 2 A schematic diagram at point D in the middle;

[0023] Figure 15 for Figure 2 A cross-sectional schematic diagram of the second valve seat;

[0024] Figure 16 for Figure 2 Schematic cross-sectional view of the middle valve body;

[0025] Figure 17A for Figure 2 Exploded structural diagram of the core iron and piston components;

[0026] Figure 17B for Figure 2 A schematic diagram at point F in the middle;

[0027] Figure 18 A cross-sectional schematic diagram of a solenoid valve, as provided in this application, for another example.

[0028] Figure 19 for Figure 18 A schematic diagram at point E in the middle;

[0029] Figure 20 for Figure 18A three-dimensional schematic diagram of the central ring-shaped component.

[0030] In the picture:

[0031] 1-Valve body component, 11-Valve body, 111-Mounting hole, 1110-Mounting hole opening, 1111-First hole portion, 1112-Second hole portion, 1113-First step portion, 11131-First step surface, 1114-Third hole portion, 1115-Second step portion, 11151-Second step surface, 1116-Fourth hole portion, 1117-Third step portion, 11171-Third step surface, 112-First flow channel, 1121-First flow channel section, 1122-Second flow channel section, 113-Second flow channel, 114-Third flow channel, 12-Second valve seat, 121-First valve port, 122-Second cylindrical portion, 123-Radial protrusion, 1231-Second sealing portion;

[0032] 2-Valve cover assembly, 21-Valve cover, 211-First cylindrical part, 212-Cover-shaped part, 22-Sleeve;

[0033] 3-Piston assembly, 31-Rod, 32-Piston, 321-Piston seal;

[0034] 4-First valve seat, 40-Connecting channel, 401-Through hole, 4011-First valve port, 402-Transverse channel, 403-Longitudinal channel, 42-First sealing part, 43-Annular protrusion, 44-Seat body part;

[0035] 5-Core iron component, 51-Stationary core iron, 52-Moving core iron, 53-Spring;

[0036] 6-Seals;

[0037] a-protrusion, b-first end portion, b1-planar portion;

[0038] x1 - first interval, x2 - second interval. Detailed Implementation

[0039] The embodiments of this application will be further described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0040] Figure 2 A schematic cross-sectional view of an example solenoid valve provided in this application; Figure 3 for Figure 2 A three-dimensional schematic diagram of a solenoid valve from a first-person perspective; Figure 4 for Figure 2 A three-dimensional schematic diagram of the solenoid valve from a second-view perspective; Figure 5 for Figure 2 A schematic diagram at point A in the middle; Figure 6 for Figure 2 A schematic diagram at point B in the middle; Figure 7 for Figure 2 A cross-sectional schematic diagram of the first valve seat in one example; Figure 8 for Figure 7 A three-dimensional schematic diagram of the first valve seat from a first-view perspective; Figure 9 for Figure 7 A three-dimensional schematic diagram of the first valve seat from a second perspective; Figure 10 for Figure 2 A three-dimensional schematic diagram of a valve cover as an example; Figure 11 for Figure 2 A three-dimensional schematic diagram of the first valve seat in another example; Figure 12 for Figure 2 The image also shows a three-dimensional schematic diagram of an example valve cover; Figure 13 for Figure 2 A schematic diagram at point C in the middle; Figure 14 for Figure 2 A schematic diagram at point D in the middle; Figure 15 for Figure 2 A cross-sectional schematic diagram of the second valve seat; Figure 16 for Figure 2 Schematic cross-sectional view of the middle valve body; Figure 17A for Figure 2 Exploded structural diagram of the core iron and piston components; Figure 17B for Figure 2 A schematic diagram at point F in the middle.

[0041] It should be noted that, with Figure 2 For example, the lateral direction of the solenoid valve is the radial direction of the valve cover 21 described below, and the longitudinal direction of the solenoid valve is the axial direction of the valve cover 21 described below.

[0042] The solenoid valve of this embodiment includes a valve body component 1, a valve cover component 2, a piston component 3, a first valve port seat 4, and a core iron component 5. The valve body component 1 includes a valve body 11, and the valve cover component 2 includes a valve cover 21 and a sleeve 22. The valve cover 21 is threadedly connected to the valve body 11. The valve body 11 includes a mounting hole 111 and a first flow channel 112. The valve cover 21 is partially located in the mounting hole 111, and the first valve port seat 4 is located in the mounting hole 111. The first valve port seat 4 is at least partially located below the valve cover 21. The first valve port seat 4 includes a through hole 401 extending axially along the valve cover 21. The through hole 401 includes a first valve port 4011 located at its lower end. The valve body component 1 includes a second valve port 121 located below the first valve port seat 4.

[0043] The piston assembly 3 includes a rod 31 and a piston 32. The rod 31 is connected to the core iron assembly 5 and is disposed through a through hole 401 along the axial direction of the valve cover 21. The piston 32 is located between the first valve seat 12 and the second valve seat 12 described below. In the longitudinal direction of the solenoid valve, the piston assembly 3 can move relative to the valve body 11, and the piston 32 can block the first valve port 4011 or the second valve port 121.

[0044] The sleeve 22 is formed by processing stainless steel tubing. Part of the sleeve 22 is located inside the valve cover 21, and the sleeve 22 is welded and fixed to the valve cover 21. The core iron component 5 is located within the inner cavity of the sleeve 22. The core iron component 5 includes a stationary core iron 51, a moving core iron 52, and a spring 53. The stationary core iron 51 is fixedly connected to the sleeve 22, the moving core iron 52 is fixedly connected to the rod body 31, one end of the spring 53 abuts against the stationary core iron 51, and the other end of the spring 53 abuts against the moving core iron 52. Figure 2 As shown, when the piston 32 blocks the first valve port 4011, there is a second gap x2 between the moving core iron 52 and the stationary core iron 51. That is, the moving core iron 52 and the stationary core iron 51 do not contact each other in the axial direction of the valve cover 21. In this way, the noise of the moving core iron 52 and the stationary core iron 51 engaging can be effectively reduced or eliminated.

[0045] Regarding the medium flow path of the solenoid valve, specifically, the valve body 11 includes a first flow channel 112, a second flow channel 113, and a third flow channel 114. In one specific embodiment, the first flow channel 112 can be used to connect with the inlet pipe, the second flow channel 113 can be used to connect with the first outlet pipe, and the third flow channel 114 can be used to connect with the second outlet pipe. The first flow channel 112 is located above the second flow channel 113. The port of the third flow channel 114 that can connect with either the first flow channel 112 or the second flow channel 113 is located between the first valve port 4011 and the second valve port 121. This port is located on the wall of the second hole portion 1112 described below. The other port of the third flow channel 114 is located on the outer wall of the valve body 11. The first valve port seat 4 includes a connecting channel 40 connected to the first flow channel 112. The connecting channel 40 includes a transverse channel 402 and a longitudinal channel 403. Figure 7 As shown, the longitudinal section of the connecting channel 40 is cross-shaped, the longitudinal channel 403 serves as the aforementioned through hole 401, and the transverse channel 402 penetrates the first valve seat 4 radially along the valve cover 21.

[0046] When the solenoid valve switches flow paths, the moving core 52 can move relative to the valve body 11 through electromagnetic force or the elastic force of the spring 53, driving the piston component 3 to move relative to the valve body 11. The piston 32 blocks the first valve port 4011 or the second valve port 121. The solenoid valve includes at least a first position and a second position. When the solenoid valve is in the first position, that is, when the piston 32 blocks the first valve port 4011, the second flow channel 113 is connected to the third flow channel 114. When the solenoid valve is in the second position, that is, when the piston 32 blocks the second valve port 121, the first flow channel 112 is connected to the third flow channel 114.

[0047] This embodiment uses a two-position four-way solenoid valve as an example. The valve structure used to control media switching is configured as two sets, which operate independently or in conjunction to achieve switching between different flow paths. For example... Figure 2 As shown, specifically, there are two mounting holes 111, located on the left and right sides of the valve body 11. There are two valve cover components 2, two piston components 3, two first valve seat 4, and two core iron components 5. The two first valve seat 4 are located within the two mounting holes 111, and the two valve cover components 2 are fixedly connected to the valve body 11. The second flow channel 113 connects to both mounting holes 111 laterally in the solenoid valve. The first flow channel 112 includes a first flow channel section 1121 and a second flow channel section 1122. The first flow channel section 1121 connects to the inlet pipe. Figure 2 As shown, the first flow channel section 1121 is connected to the second flow channel section 1142 through the connecting channel 40 of the first valve seat 4 on the left side. The second flow channel section 1122 is simultaneously connected to the connecting channels 40 of the two first valve seats 4 in the transverse direction of the solenoid valve. Correspondingly, there are two third flow channels 114, which are respectively connected to two mounting holes 111. In this way, when each core iron component 5 drives the piston component 3 connected to it to move, switching between different flow paths can be realized.

[0048] like Figure 2-12As shown, in this embodiment, the mounting hole 111 includes a mounting opening 1110, which is located on the outer wall of the valve body 11. One of the valve cover 21 and the first valve seat 4 includes a protrusion a, which protrudes along the axial direction of the valve cover 21. The protrusion a is annular and surrounds the mounting opening 1110. The other of the valve cover 21 and the first valve seat 4 includes a first end b, which abuts against the first end b in the axial direction of the valve cover 21. On the same cross-section of the protrusion a, the maximum outer diameter of the protrusion a is defined as D1, and the minimum inner diameter of the protrusion a is defined as D2, which satisfies 0.1D2≤D1-D2≤0.36D2. The solenoid valve, by setting a protrusion a and a first end b, achieves contact between the valve cover 21 and the first valve seat 4 by the protrusion a and the first end b abutting each other during the process of screwing the valve cover 21 into the valve body 11. This reduces the contact area between the valve cover 21 and the first valve seat 4, thereby reducing the possibility that the first valve seat 4 will be driven by the valve cover 21 to rotate significantly under the action of friction. This further reduces the possibility of misalignment between the connecting channel 40 of the first valve seat 4 and the first flow channel 112 of the valve body 11, ensuring the medium flow performance of the solenoid valve.

[0049] like Figure 2 , Figure 6 , Figure 10 and Figure 16 As shown, the mounting hole 111 includes a first hole portion 1111, a second hole portion 1112, and a first stepped portion 1113. The wall of the first hole portion 1111 has a clearance fit with the outer wall of the first valve seat 4. In the axial direction of the valve cover 21, the first stepped portion 1113 is located between the first hole portion 1111 and the second hole portion 1112. The first stepped surface 11131 of the first stepped portion 1113 faces upward, and the first valve seat 4 abuts against the first stepped surface 11131. Thus, when the first valve seat 4 is installed, the axial thrust generated by the threads of the valve cover 21 acts on the first valve seat 4, forcing the first valve seat 4 to move downward along the axial direction of the valve cover 21 until the first valve seat 4 abuts against the first stepped surface 11131, so that the first valve seat 4 is axially positioned by the valve cover 21 and the valve body 11. It is understandable that since the valve cover 21 must rotate during installation, the protrusion a and the first end b can reduce the friction between the valve cover 21 and the first valve seat 4, thereby reducing the extent to which the first valve seat 4 is rotated by the valve cover 21 under the action of friction.

[0050] It should also be noted that during the actual assembly of the solenoid valve, to align the first flow channel 112 with the connecting channel 40, after installing the first valve seat 4 into the valve body 11, the tooling mandrel is sequentially inserted into the first flow channel 112 and the transverse channel 402 to achieve circumferential pre-positioning of the first valve seat 4. Combined with the above, the valve cover 21 is then used to achieve axial positioning of the first valve seat 4, ensuring that the first valve seat 4 is installed in place and that the opening of the transverse channel 402 is aligned with the opening of the first flow channel 112. The outer wall of the tooling mandrel is clearance-fitted with the inner wall of the first flow channel 112, and the inner diameter of the transverse channel 402 is slightly larger than the inner diameter of the first flow channel 112. It is understandable that after the first valve seat 4 contacts the valve cover 21, if the first valve seat 4 is rotated together with the valve cover 21, the rotation amplitude of the first valve seat 4 may exceed the circumferential dimension difference between the outer wall of the tooling mandrel and the inner wall of the transverse channel 402. This would cause the tooling mandrel to be stuck at the first valve seat 4, making it impossible to remove the tooling mandrel later, thus affecting the assembly efficiency of the solenoid valve. However, in this embodiment, the first valve seat 4 and the valve cover 21, through the setting of the protrusion a and the first end b, can control the rotation amplitude of the first valve seat 4 within a reasonable range, thereby avoiding the aforementioned situation where the tooling mandrel is stuck.

[0051] In this embodiment, the protrusion a is annular, and the annular protrusion a is arranged around the mounting hole 1110 in the circumference of the valve cover 21. The wall thickness of the protrusion a gradually decreases in the axial direction of the valve cover 21 towards the first end b. This protrusion a reduces the frictional torque generated at the contact portion between the valve cover 21 and the first valve seat 4, thereby reducing the amplitude of rotation of the first valve seat 4 caused by the valve cover 21 under the action of friction.

[0052] like Figure 7-10 As shown, the first valve seat 4 includes a protrusion a, which protrudes upward along the axial direction of the valve cover 21. The longitudinal section of the protrusion a is smaller at the top and larger at the bottom. The valve cover 21 includes a first end b, which includes a flat portion b1. The flat portion b1 abuts against the protrusion a along the axial direction of the valve cover 21. In this way, when the valve cover 21 rotates and contacts the first valve seat 4, the frictional torque generated at the contact portion between the valve cover 21 and the first valve seat 4 can be reduced.

[0053] Specifically, the longitudinal section of the protrusion a is approximately arc-shaped, and the wall thickness of the protrusion a gradually decreases axially upwards along the valve cover 21. This ensures ease of machining of the protrusion a while creating line contact or small plane contact between the protrusion a and the flat portion b1, effectively limiting the rotation of the first valve seat 4 caused by the valve cover 21. Of course, it is understood that the longitudinal section of the protrusion a is not limited to an arc shape; a conical, trapezoidal, or U-shaped design can also be used.

[0054] Understandably, for the miniaturized design of the solenoid valve, the outer diameter of the first valve seat 4 should not be too large. Based on this, the first valve seat 4 includes a seat body 44 and the aforementioned protrusion a. The protrusion a protrudes upward from the seat body 44, which is cylindrical. The maximum outer diameter of the seat body 44 is defined as D3, satisfying 14mm ≤ D3 ≤ 18mm. Thus, while avoiding excessive rotation of the first valve seat 4 due to the valve cover 21, considering the manufacturability and material cost, the preferred size for the protrusion a is 1.5mm ≤ D1 - D2 ≤ 5mm.

[0055] The difference between the outer diameter of the seat portion 44 and the inner diameter of the protrusion a, which is also the difference between D3 and D2 mentioned above, satisfies 1.5mm ≤ D3 - D2 ≤ 5mm. Figure 7-8 As shown, the dimension of D3 is the same as that of D1, that is, in the radial projection direction of the valve cover 21, the outer surface of the seat portion 44 and the outer surface of the protrusion a form a continuous surface. Thus, when machining the protrusion a, it is not necessary to deliberately control the outer diameter range of the protrusion a, but only to focus on and control the inner diameter range of the protrusion a.

[0056] like Figure 11-12 As shown, as another example, the valve cover 21 includes a protrusion a that protrudes downward along the axial direction of the valve cover 21. The longitudinal section of the protrusion a is larger at the top and smaller at the bottom. The first valve seat 4 includes a first end b, which includes a flat portion b1. The protrusion a and the flat portion b1 abut against each other along the axial direction of the valve cover 21. The difference between the outer diameter and the inner diameter of the protrusion a, that is, the difference between D1 and D2 mentioned above, satisfies 1.5mm ≤ D1 - D2 ≤ 5mm. In this way, when the valve cover 21 rotates and contacts the first valve seat 4, the frictional force generated at the contact portion between the valve cover 21 and the first valve seat 4 is reduced.

[0057] like Figure 6 , Figure 9 As shown, the hardness of valve body component 1 is lower than that of first valve seat 4. First valve seat 4 includes a downwardly protruding first sealing part 42. Along the axial direction of valve cover 21, the wall thickness of the end of the first sealing part 42 near valve cover 21 is greater than the wall thickness of the end of the first sealing part 42 away from valve cover 21. The first sealing part 42 is annular and abuts against valve body component 1.

[0058] Specifically, the first sealing part 42 abuts against the first stepped surface 11131. The valve body 11 is made of aluminum alloy, the first valve seat 4 is made of stainless steel, and the longitudinal section of the first sealing part 42 is conical, with the tip of the cone facing the valve body 11. During the installation and threading of the valve cover 21, the first valve seat 4 is partially engraved into the valve body 11 by the thrust of the valve cover 21, thereby sealing the gap between the first valve seat 4 and the first stepped surface 11131.

[0059] like Figure 2 , Figure 10 , Figure 13 As shown, the valve cover 21 includes a first cylindrical portion 211 and a cap-shaped portion 212. The first cylindrical portion 211 includes a first external thread portion that is threaded to the fourth hole portion 1116 described below. Correspondingly, the fourth hole portion 1116 includes a first internal thread portion. In the axial direction of the valve cover 21, there is a first gap x1 between the cap-shaped portion 212 and the outer wall of the valve body 11. Thus, during the process of screwing the valve cover 21 into the valve body 11, the sealing reliability between the first valve seat 4 and the valve body 11 can be preferentially guaranteed. The solenoid valve also includes a sealing element 6, which is fitted over the first cylindrical portion 211 and is located above the first external thread portion. In the radial direction of the valve cover 21, the outer side of the sealing element 6 abuts against the hole wall of the fourth hole portion 1116, and the inner side of the sealing element 6 abuts against the outer wall of the first cylindrical portion 211, thereby achieving a seal between the valve cover 21 and the valve body 11.

[0060] like Figure 2 , Figure 16 As shown, the mounting hole 111 also includes a fourth hole portion 1116 and a third step portion 1117. The third step surface 11171 of the third step portion 1117 faces upward. In the axial direction of the valve cover 21, the third step portion 1117 is located between the first hole portion 1111 and the fourth hole portion 1116. The hole wall of the first hole portion 1111 is clearance-fitted with the outer wall of the first valve seat 4. The protrusion a is located above the third step surface 11171, and the first end b is located above the third step surface 11171. In this way, when the valve cover 21 is screwed into the valve body 11 but not fully tightened, the valve cover 21 is prevented from abutting against the third step surface 11171, thereby ensuring the sealing reliability between the first valve seat 4 and the valve body 11.

[0061] The inner diameter of the fourth hole 1116 is greater than or equal to the inner diameter of the first hole 1111 described below, that is, the outer diameter of the valve cover 21 is greater than the outer diameter of the first valve seat 4.

[0062] like Figure 2 , Figure 14 , Figure 15As shown, the valve body component 1 also includes a second valve seat 12, which is located below the first valve seat 4. The second valve seat 12 includes a second valve seat 121, and the mounting hole 111 includes a second hole portion 1112, a third hole portion 1114, and a second stepped portion 1115. In the longitudinal direction of the solenoid valve, the second stepped portion 1115 is located between the second hole portion 1112 and the third hole portion 1114, and the second stepped surface 11151 of the second stepped portion 1115 faces the first valve seat 4. Thus, through the above structural design, it is beneficial to reduce the processing cost of the valve body 11, and when the second valve seat 12 is damaged, it can be replaced separately without having to replace the entire valve body 11.

[0063] like Figure 14 As shown, the second valve seat 12 includes a second cylindrical portion 122 and a radial protrusion 123. The second cylindrical portion 122 is fixedly connected to the valve body 11. In the radial direction of the valve cover 21, the radial protrusion 123 protrudes outward from the second cylindrical portion 122. The radial protrusion 123 includes a downwardly protruding second sealing portion 1231, which abuts against the second stepped surface 11151. The second cylindrical portion 122 includes a second external thread, and the mounting hole 111 includes a second internal thread portion located in the third hole portion 1114. The second cylindrical portion 122 is threadedly connected to the valve body 11. The second valve seat 12 is made of stainless steel. The longitudinal section of the second sealing part 1231 is conical, with the tip of the cone facing the valve body 11. During the installation and thread tightening of the second valve seat 12 with the valve body 11, the second sealing part 1231 is partially engraved into the valve body 11 to seal the gap between the second valve seat 12 and the second step surface 11151.

[0064] like Figure 2 , Figure 17A , Figure 17B As shown, the first valve seat 4 includes a downwardly protruding annular protrusion 43, which surrounds the rod 31. The annular protrusion 43 includes a partial through hole 401 and the aforementioned first valve port 4011. The piston 32 includes a non-metallic piston sealing part 321. The outer diameter of the piston sealing part 321 is larger than the inner diameter of the first valve port 121, and the outer diameter of the annular protrusion 43 is smaller than the outer diameter of the piston sealing part 321. Thus, when the piston 32 blocks the first valve port 4011, the sealing size of the piston sealing part 321 can cover the annular protrusion 43, ensuring sealing reliability. Before connecting the piston component 3 to the moving core iron 52, the upper end of the rod 31 must first extend upward through the through hole 401 to the first valve seat 4, and the piston 32 must be positioned below the first valve seat 4. Then, the upper end of the rod 31 is welded and fixed to the moving core iron 52. Thus, when the first valve seat 4 is installed into the valve body 11, the piston component 3 and the moving core iron 52 are installed together with the first valve seat 4.

[0065] Figure 18 A cross-sectional schematic diagram of another example of a solenoid valve provided for this application; Figure 19 for Figure 18 A schematic diagram at point E in the middle; Figure 20 for Figure 18 A three-dimensional schematic diagram of the central ring-shaped component.

[0066] like Figure 18-20 As shown, the hardness of valve body component 1 is lower than that of the first valve seat 4. Valve body component 1 includes an annular member 13. Mounting hole 111 includes a first hole portion 1111, a second hole portion 1112, and a first step portion 1113. The hole wall of the first hole portion 1111 is clearance-fitted with the outer wall of the first valve seat 4. In the axial direction of valve cover 21, the first step portion 1113 is located between the first hole portion 1111 and the second hole portion 1112. The first step surface 11131 of the first step portion 1113 faces upward. In the axial direction of valve cover 21, one end of the annular member 13 abuts against the first step surface 11131, and the other end of the annular member 13 abuts against the first sealing portion 42. In this embodiment, the longitudinal section of the first sealing part 42 is tapered, and the tip of the tapered part faces the first step surface 11131. During the installation and threading of the valve cover 21, the first valve seat 4 partially engraves the first sealing part 42 into the annular part 13 by the thrust of the valve cover 21, thereby sealing the gap between the first valve seat 4 and the annular part 13.

[0067] With this configuration, the sealing between the first valve seat 4 and the valve body 11 is achieved through the annular component 13, eliminating the need for direct contact between the first valve seat 4 and the valve body 11. This reduces the machining accuracy of the first step surface 11131, thereby improving the machining efficiency of the valve body 11.

[0068] The annular part 13 is made of the same aluminum alloy as the valve body 11. Since the first stepped surface 11131 is inside the mounting hole 111, it is not easy to process. However, the annular part 13, as a separate part, is easy to process into a sealing surface that mates with the first sealing part 42.

[0069] Alternatively, the annular component 13 can be made of a metal or plastic with a lower hardness than the first valve seat 4. Specifically, the first valve seat 4 can be made of stainless steel, and the annular component 13 can be made of PTFE (polytetrafluoroethylene) or copper. This makes it easier for the first sealing portion 42 of the first valve seat 4 to be engraved into the annular component 13, thereby ensuring reliable sealing.

[0070] Figure 8A for Figure 2 The image also shows a three-dimensional schematic diagram of an example of a first valve seat; Figure 12A for Figure 2 A three-dimensional schematic diagram of another example of a valve cover.

[0071] like Figure 8A and Figure 12AAs shown, in this embodiment, one of the valve cover 21 and the first valve seat 4 includes a protrusion a, which protrudes along the axial direction of the valve cover 21 and is in the shape of a raised dot. The protrusion a surrounds the mounting hole 1110. The other of the valve cover 21 and the first valve seat 4 includes a first end b, which abuts against the first end b in the axial direction of the valve cover 21. By providing the protrusion a and the first end b, the solenoid valve achieves contact between the valve cover 21 and the first valve seat 4 through the abutment between the protrusion a and the first end b during the process of screwing the valve cover 21 into the valve body 11. This reduces the contact area between the valve cover 21 and the first valve seat 4, thereby reducing the possibility that the first valve seat 4 will be driven by the valve cover 21 to rotate significantly under the action of friction. This further reduces the possibility of misalignment between the connecting channel 40 of the first valve seat 4 and the first flow channel 112 of the valve body 11, ensuring the medium flow performance of the solenoid valve.

[0072] In this embodiment, the first valve seat 4 is an injection-molded part, and includes a protrusion a. The protrusion a protrudes upward along the axial direction of the valve cover 21. There are at least two protrusions a, and the at least two protrusions a are evenly spaced and uniformly arranged circumferentially around the valve cover 21. The valve cover 21 includes a first end b, and the first end b includes a flat portion b1. The flat portion b1 abuts against the protrusion a in the axial direction of the valve cover 21. Alternatively, the valve cover 21 is an injection-molded part, and the valve cover 21 includes a protrusion a. The protrusion a protrudes downward along the axial direction of the valve cover 21. There are at least two protrusions a, and the at least two protrusions a are evenly spaced and uniformly arranged circumferentially around the valve cover 21. The first valve seat 4 includes a first end b, and the first end b includes a flat portion b1. The protrusion a and the flat portion b1 abut against each other in the axial direction of the valve cover 21. In this way, when the valve cover 21 rotates and contacts the first valve seat 4, the frictional torque generated at the contact portion between the valve cover 21 and the first valve seat 4 can be reduced.

[0073] Understandably, considering the manufacturability of the protrusion a and the cost of materials, both the valve body component 1 and the valve cover component 2 in this embodiment are made of plastic, specifically polyphenylene sulfide (PPS). This effectively reduces the cost of the solenoid valve.

[0074] The longitudinal section of the protrusion a is approximately arc-shaped, and the wall thickness of the protrusion a gradually decreases axially upwards along the valve cover 21. This ensures ease of machining of the protrusion a while creating point or small-plane contact between the protrusion a and the flat portion b1, effectively limiting the rotation of the first valve seat 4 caused by the valve cover 21. Of course, it is understood that the longitudinal section of the protrusion a is not limited to an arc shape; it can also be tapered, trapezoidal, or convex.

[0075] The above examples illustrate the principles and implementation methods of this application. The descriptions of the embodiments are merely for the purpose of helping to understand the technical solutions and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A solenoid valve, characterized in that, The valve body (11), valve cover (21), and first valve seat (4) are included. The valve body (11) includes a mounting hole (111) and a first flow channel (112). The valve cover (21) is partially located in the mounting hole (111) and is threadedly connected to the valve body (11). The first valve seat (4) is located in the mounting hole (111) and is at least partially located below the valve cover (21). The first valve seat (4) includes a communicating channel (40) that communicates with the first flow channel (112). The mounting hole (111) includes a mounting opening (1110). One of the valve cover (21) and the first valve seat (4) includes a protrusion (a). The protrusion (a) protrudes along the axial direction of the valve cover (21). The protrusion (a) is annular and is arranged around the mounting opening (1110). The other of the valve cover (21) and the first valve seat (4) includes a first end (b). The protrusion (a) and the first end (b) abut against each other in the axial direction of the valve cover (21). On the same cross-section of the protrusion (a), the maximum outer diameter of the protrusion (a) is defined as D1, and the minimum inner diameter of the protrusion (a) is defined as D2. Then, 0.1D2≤D1-D2≤0.36D2 is satisfied.

2. The solenoid valve according to claim 1, characterized in that, The first valve seat (4) includes the protrusion (a), which protrudes upward along the axial direction of the valve cover (21). The valve cover (21) includes the first end (b), which includes a flat portion (b1). The flat portion (b1) abuts against the protrusion (a) along the axial direction of the valve cover (21). The difference between the outer diameter and the inner diameter of the protrusion (a) satisfies 1.5mm≤D1-D2≤5mm.

3. The solenoid valve according to any one of claims 1-2, characterized in that, The first valve seat (4) includes a seat body (44) and a protrusion (a). The protrusion (a) protrudes upward from the seat body (44). The seat body (44) is cylindrical. The maximum outer diameter of the seat body (44) is defined as D3. The protrusion (a) is annular. The difference between the outer diameter of the seat body (44) and the inner diameter of the protrusion (a) satisfies 2mm≤D3-D2≤5mm.

4. The solenoid valve according to claim 1, characterized in that, The valve cover (21) includes the protrusion (a), which protrudes downward along the axial direction of the valve cover (21). The first valve seat (4) includes the first end (b), which includes a flat portion (b1). The protrusion (a) and the flat portion (b1) abut against each other along the axial direction of the valve cover (21). The difference between the outer diameter and the inner diameter of the protrusion (a) satisfies 1.5mm≤D1-D2≤5mm.

5. The solenoid valve according to any one of claims 1-4, characterized in that, The valve body component (1) includes the valve body (11). The hardness of the valve body component (1) is lower than that of the first valve seat (4). The first valve seat (4) includes a downwardly protruding first sealing part (42). Along the axial direction of the valve cover (21), the cross-sectional area of ​​the end of the first sealing part (42) near the valve cover (21) is greater than the cross-sectional area of ​​the end of the first sealing part (42) away from the valve cover (21). The first sealing part (42) is annular and abuts against the valve body component (1).

6. The solenoid valve according to claim 5, characterized in that, The mounting hole (111) includes a first hole (1111), a second hole (1112), and a first stepped portion (1113). The hole wall of the first hole (1111) is clearance-fitted with the outer wall of the first valve seat (4). In the axial direction of the valve cover (21), the first stepped portion (1113) is located between the first hole (1111) and the second hole (1112). The first stepped surface (11131) of the first stepped portion (1113) faces upward, and the first sealing portion (42) abuts against the first stepped surface (11131).

7. The solenoid valve according to claim 5, characterized in that, The valve body component (1) includes an annular member (13), and the mounting hole (111) includes a first hole (1111), a second hole (1112), and a first stepped portion (1113). The hole wall of the first hole (1111) is clearance-fitted with the outer wall of the first valve seat (4). In the axial direction of the valve cover (21), the first stepped portion (1113) is located between the first hole (1111) and the second hole (1112). The first stepped surface (11131) of the first stepped portion (1113) faces upward. In the axial direction of the valve cover (21), one end of the annular member (13) abuts against the first stepped surface (11131), and the other end of the annular member (13) abuts against the first sealing portion (42).

8. The solenoid valve according to any one of claims 1-7, characterized in that, The mounting hole (111) includes a first hole (1111), a fourth hole (1116), and a third step (1117). In the axial direction of the valve cover (21), the third step (1117) is located between the first hole (1111) and the fourth hole (1116). The third step surface (11171) of the third step (1117) faces upward. The hole wall of the first hole (1111) is clearance-fitted with the outer wall of the first valve seat (4). The protrusion (a) is located above the third step surface (11171), and the first end (b) is located above the third step surface (11171). The solenoid valve includes a seal (6), and the valve cover (21) includes a first cylindrical portion (2111) and a cap portion (212). The first cylindrical portion (2111) includes a first external thread portion that is threadedly connected to the fourth hole portion (1116). The cap portion (212) is located above the first cylindrical portion (2111). In the axial direction of the valve cover (21), the cap portion (212) has a first gap (x1) between it and the outer wall of the valve body (11). The seal (6) is fitted over the first cylindrical portion (2111). The seal (6) is located above the first external thread portion. In the radial direction of the valve cover (21), the outer side of the seal (6) abuts against the hole wall of the fourth hole portion (1116), and the inner side of the seal (6) abuts against the outer wall of the first cylindrical portion (2111).

9. The solenoid valve according to any one of claims 1-8, characterized in that, The solenoid valve includes a valve body component (1), a piston component (3), and a core iron component (5). The piston component (3) includes a rod (31) and a piston (32). The first valve seat (4) includes a downwardly protruding annular protrusion (43) surrounding the rod (31). The communicating channel (40) includes a through hole (401). The rod (31) passes through the through hole (401) along the axial direction of the valve cover (21). The annular protrusion (43) includes a portion of the through hole (401). The annular protrusion (43) includes a first valve port (4011). The valve body component (1) includes... The valve body (11) and the second valve seat (12) are described. The second valve seat (12) includes a second sealing part (1231) that abuts against the valve body (11). The second valve seat (12) is located below the first valve seat (4). The second valve seat (12) includes a second valve port (121). The piston (32) is located between the first valve seat (4) and the second valve seat (12). The piston (32) is capable of blocking the first valve port (4011) or the second valve port (121). The wall thickness of the protrusion (a) gradually decreases in the axial direction of the valve cover (21) towards the first end (b). The core iron component (5) is at least partially located above the first valve seat (4). The core iron component (5) includes a stationary core iron (51) and a moving core iron (52). The moving core iron (52) is fixedly connected to the rod body (31). When the piston (32) blocks the first valve port (4011), there is a second gap (x2) between the moving core iron (52) and the stationary core iron (51). The valve body (11) further includes a second flow channel (113) and a third flow channel (114). The second flow channel (114) is located below the first flow channel (112). The port of the third flow channel (114) that can communicate with the first flow channel (112) or the second flow channel (113) is located between the second valve port (121) and the first valve port (4011). When the piston (32) blocks the first valve port, the second flow channel (113) is connected to the third flow channel (114). When the piston (32) blocks the second valve port (121), the first flow channel (112) is connected to the third flow channel (114) through the connecting channel (40). There are two mounting holes (111), which are located on both sides of the valve body (11). There are two valve covers (21), two piston components (3), two core iron components (5), two first valve seat (4), and two second valve seat (12).

10. A solenoid valve, characterized in that, The valve body (11), valve cover (21), and first valve seat (4) are included. The valve body (11) includes a mounting hole (111) and a first flow channel (112). The valve cover (21) is partially located in the mounting hole (111) and is threadedly connected to the valve body (11). The first valve seat (4) is located in the mounting hole (111) and is at least partially located below the valve cover (21). The first valve seat (4) includes a communicating channel (40) that communicates with the first flow channel (112). The mounting hole (111) includes a mounting opening (1110). One of the valve cover (21) and the first valve seat (4) includes a protrusion (a) that protrudes along the axial direction of the valve cover (21). The protrusion (a) is dot-shaped and is arranged around the mounting opening (1110). The other of the valve cover (21) and the first valve seat (4) includes a first end (b). The protrusion (a) and the first end (b) abut against each other in the axial direction of the valve cover (21).

11. The solenoid valve according to claim 10, characterized in that, The first valve seat (4) is an injection molded part. The first valve seat (4) includes the protrusion (a). The protrusion (a) protrudes upward along the axial direction of the valve cover (21). The number of the protrusions (a) is at least two. The at least two protrusions (a) are equally spaced around the circumference of the valve cover (21). The valve cover (21) includes the first end (b). The first end (b) includes a flat part (b1). The flat part (b1) abuts against the protrusion (a) in the axial direction of the valve cover (21). Alternatively, the valve cover (21) may be an injection molded part, the valve cover (21) may include the protrusion (a), the protrusion (a) may protrude downward along the axial direction of the valve cover (21), the number of the protrusion (a) may be at least two, the at least two protrusions (a) may be equally spaced around the circumference of the valve cover (21), the first valve seat (4) may include the first end (b), the first end (b) may include the flat part (b1), the protrusion (a) and the flat part (b1) may abut against each other in the axial direction of the valve cover (21).

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