Piston assembly for electromagnetic valve and electromagnetic valve

Abstract

The utility model discloses a piston assembly used for an electromagnetic valve and the electromagnetic valve. The piston assembly used for the electromagnetic valve comprises a piston body, the fixed seat is arranged on the piston body in a sleeving manner; and the sealing piece is arranged on the piston body in a sleeving mode and abuts against the fixing base, the sealing piece comprises a supporting framework and a sealing body, and the supporting framework is arranged in the sealing body. According to the piston assembly for the electromagnetic valve, the piston body is sleeved with the fixing base and the sealing piece, the sealing piece abuts against the fixing base, the sealing piece comprises the supporting framework and the sealing body, and the supporting framework is arranged in the sealing body, so that the strength and rigidity of the sealing piece can be enhanced; according to the electromagnetic valve, the sealing piece and the fixing base are attached more tightly and flatly, media are difficult to enter the space between the sealing piece and the fixing base, the deformation resistance of the sealing piece is improved, the problem that the electromagnetic valve fails due to extrusion deformation of the sealing piece can be effectively solved, the internal leakage performance level of the electromagnetic valve is improved, and the reliability of the electromagnetic valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solenoid valves, and more particularly to a piston assembly for a solenoid valve and a solenoid valve. Background Art

[0002] In related technologies, during the operation of the solenoid valve, the medium will enter between the seal and the fixed seat. Due to the changes in temperature and pressure inside the solenoid valve, the medium accumulated between the seal and the fixed seat can easily squeeze and deform the seal, affecting the performance of the solenoid valve. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems in the prior art. To this end, one object of the present invention is to provide a piston assembly for a solenoid valve, which can prevent the seal from being squeezed and deformed, thereby ensuring the reliability of the solenoid valve.

[0004] Another object of the present invention is to provide a solenoid valve having the above piston assembly.

[0005] According to an embodiment of the present invention, a piston assembly for a solenoid valve includes: a piston body; a fixing seat, which is sleeved on the piston body; a sealing member, which is sleeved on the piston body and abuts against the fixing seat, and the sealing member includes a supporting frame and a sealing body, and the supporting frame is arranged in the sealing body.

[0006] According to the piston assembly for the solenoid valve according to the embodiment of the present invention, the fixed seat and the seal are sleeved on the piston body, and the seal is against the fixed seat. The seal includes a supporting frame and a sealing body. The supporting frame is arranged in the sealing body, which can enhance the strength and rigidity of the seal, so that the seal and the fixed seat fit more tightly and smoothly, and it is difficult for the medium to enter between the seal and the fixed seat. The ability of the seal to resist deformation is increased, which can effectively prevent the problem of solenoid valve failure caused by extrusion and deformation of the seal, improve the internal leakage performance level of the solenoid valve, and improve the reliability of the solenoid valve.

[0007] In addition, the piston assembly for the solenoid valve according to the above embodiment of the utility model may also have the following additional technical features:

[0008] According to some embodiments of the present invention, in the piston assembly for a solenoid valve, the support frame and the sealing body are integrally formed as an injection-molded part.

[0009] According to some embodiments of the present invention, the support frame is provided with an avoidance hole for avoiding the piston body and a hollow portion spaced apart from the avoidance hole, and the hollow portion passes through the support frame along the thickness direction of the support frame.

[0010] According to some embodiments of the present invention, the hollow portions are multiple and spaced apart along the circumferential direction of the avoidance hole.

[0011] According to some embodiments of the present invention, the hollow portion is formed as a through hole; or, the supporting skeleton includes an annular portion and a plurality of extension portions, the annular portion defines the avoidance hole, the plurality of extension portions are arranged at intervals along the circumferential direction of the annular portion and connected to the outer peripheral wall of the annular portion, and the hollow portion is defined between two adjacent extension portions.

[0012] According to some embodiments of the present invention, at least one of the piston body and the seal is provided with an exhaust channel, one end of the exhaust channel is located between the seal and the fixing seat and the other end extends to the outer wall surface of the piston body or the seal.

[0013] According to some embodiments of the present invention, a limiting portion extending toward the direction approaching the sealing member is provided on the outer edge of the fixing seat, the sealing member is located on the inner side of the limiting portion, and a first flange is provided on the free end of the limiting portion, which abuts against the end face of the sealing member away from the fixing seat.

[0014] According to some embodiments of the present invention, a protrusion extending along the circumferential direction of the seal is provided on the outer peripheral wall of the seal near one end of the fixing seat, and the first flange abuts against the end face of the protrusion away from the fixing seat.

[0015] According to some embodiments of the present invention, a second flange is provided at one axial end of the piston body close to the seal, and the second flange abuts against an end face of the seal away from the fixing seat.

[0016] According to some embodiments of the present invention, a fixing gasket is provided between the sealing member and the second flange along the axial direction of the piston body.

[0017] The solenoid valve according to the embodiment of the present invention includes the piston assembly for the solenoid valve according to the embodiment of the present invention.

[0018] According to the solenoid valve of the embodiment of the present invention, the fixing seat and the sealing member are sleeved on the piston body, and the sealing member is against the fixing seat. The sealing member includes a supporting frame and a sealing body. The supporting frame is arranged in the sealing body, which can enhance the strength and rigidity of the seal, make the seal and the fixing seat fit more tightly and smoothly, and make it difficult for the medium to enter between the seal and the fixing seat. The ability of the seal to resist deformation is increased, which can effectively prevent the problem of solenoid valve failure caused by extrusion and deformation of the seal, improve the internal leakage performance level of the solenoid valve, and improve the reliability of the solenoid valve.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a partial cross-sectional view of a solenoid valve according to a first embodiment of the present utility model;

[0022] Figure 2 is a cross-sectional view of a piston assembly according to the first embodiment of the present utility model, wherein the second flange abuts against the sealing member;

[0023] Figure 3 is a cross-sectional view of a piston assembly according to the first embodiment of the present invention, wherein the second flange does not abut against the sealing member;

[0024] Figure 4 1 is a schematic structural diagram of a piston body of a piston assembly according to a first embodiment of the present utility model;

[0025] Figure 5 1 is a schematic structural diagram of a fixing seat of a piston assembly according to a first embodiment of the present utility model;

[0026] Figure 6 is a cross-sectional view of a solenoid valve according to a second embodiment of the present utility model;

[0027] Figure 7 is a cross-sectional view of a piston assembly according to a second embodiment of the present utility model;

[0028] Figure 8 is a cross-sectional view of a sealing member of a piston assembly according to a second embodiment of the present utility model;

[0029] Figure 9 is a bottom view of a sealing member of a piston assembly according to a second embodiment of the present utility model;

[0030] Figure 10 is a cross-sectional view of a solenoid valve according to a third embodiment of the present utility model;

[0031] Figure 11 is a cross-sectional view of a piston assembly according to a third embodiment of the present utility model;

[0032] Figure 12 is a cross-sectional view of a sealing member of a piston assembly according to a third embodiment of the present utility model;

[0033] Figure 13 is a cross-sectional view of a solenoid valve according to a fourth embodiment of the present utility model;

[0034] Figure 14 is a cross-sectional view of a piston assembly according to a fourth embodiment of the present utility model;

[0035] Figure 15 is a cross-sectional view of a sealing member of a piston assembly according to a fourth embodiment of the present utility model;

[0036] Figure 16 yes Figure 15 Cross-sectional view along line AA;

[0037] Figure 17 1 is a schematic structural diagram of a support frame of a piston assembly according to a fourth embodiment of the present utility model;

[0038] Figure 18 It is a schematic structural diagram of a support frame of a piston assembly according to a fifth embodiment of the present utility model.

[0039] Reference numerals:

[0040] 100, piston assembly; 200, solenoid valve;

[0041] 10. Piston body; 11. Position limiting boss; 12. Second flange; 13. Groove;

[0042] 20. Fixed seat; 21. Limiting portion; 22. First flange;

[0043] 30. Sealing member; 31. Abutment area; 32. Raised portion; 301. Support frame; 302. Sealing body;

[0044] 40. Exhaust channel;

[0045] 51. Avoidance hole; 52. Hollow portion; 53. Ring portion; 54. Extension portion;

[0046] 60. Fixing gasket;

[0047] 71. Drive device; 72. Pilot valve unit; 73. Inlet; 74. Outlet; 75. Piston seat; 76. Valve seat; 77. Elastic member; 78. Valve port; 721. Pilot valve port;

[0048] 81. First sealing ring; 82. Second sealing ring; 83. Third sealing ring; 84. Fourth sealing ring. DETAILED DESCRIPTION

[0049] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0051] In the description of the present invention, "first feature" and "second feature" may include one or more such features, "plurality" means two or more, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them, the first feature "above", "above" and "above" the second feature include the first feature being directly above and diagonally above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0052] The piston assembly 100 for the solenoid valve 200 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0053] Reference Figures 13-18 As shown, the piston assembly 100 for the solenoid valve 200 according to an embodiment of the present invention may include: a piston body 10 , a fixing seat 20 and a sealing member 30 .

[0054] Specifically, the fixing seat 20 and the sealing member 30 are both sleeved on the piston body 10 , and the sealing member 30 abuts against the fixing seat 20 , so that the fixing seat 20 can limit the sealing member 30 , ensuring a good sealing effect of the piston assembly 100 .

[0055] In related technologies, during the operation of the solenoid valve, the medium will enter between the seal and the fixed seat. Due to the changes in temperature and pressure inside the solenoid valve, the medium accumulated between the seal and the fixed seat can easily squeeze and deform the seal, affecting the performance of the solenoid valve.

[0056] Therefore, in the present invention, if Figures 13-18 As shown, the seal 30 includes a support frame 301 and a sealing body 302. The support frame 301 is arranged in the sealing body 302, which can enhance the strength and rigidity of the seal 30, so that the seal 30 and the fixing seat 20 fit more tightly and smoothly, and it is difficult for the medium to enter between the seal 30 and the fixing seat 20. The seal 30 can also withstand greater force and impact force, thereby increasing the ability of the seal 30 to resist deformation, thereby solving the problem that the seal 30 is squeezed and deformed by the high pressure of the medium during use of the solenoid valve 200, and can prevent the solenoid valve 200 from failing due to squeezing and deformation of the seal 30, thereby improving the internal leakage performance level of the solenoid valve 200 and improving the reliability of the solenoid valve 200.

[0057] According to the embodiment of the utility model, the piston assembly 100 for the solenoid valve 200 is sleeved on the piston body 10 through the fixing seat 20 and the sealing member 30, and the sealing member 30 is against the fixing seat 20. The sealing member 30 includes a supporting skeleton 301 and a sealing body 302. The supporting skeleton 301 is arranged in the sealing body 302, which can enhance the strength and rigidity of the sealing member 30, so that the seal 30 and the fixing seat 20 fit more tightly and smoothly, and it is difficult for the medium to enter between the seal 30 and the fixing seat 20. The ability of the sealing member 30 to resist deformation is increased, which can effectively prevent the failure of the solenoid valve 200 due to the extrusion deformation of the seal 30, thereby improving the internal leakage performance level of the solenoid valve 200 and improving the reliability of the solenoid valve 200.

[0058] According to some embodiments of the present invention, the support frame 301 and the sealing body 302 are integrally injection-molded parts, so that the connection strength between the support frame 301 and the sealing body 302 is high, the manufacturing is simple, and the assembly process is reduced, which is conducive to improving production efficiency.

[0059] In some embodiments of the present invention, Figure 16-18 As shown, the support frame 301 is provided with an avoidance hole 51 and a hollow portion 52. The avoidance hole 51 can avoid the piston body 10 to avoid interference between the support frame 301 and the piston body 10, so as to facilitate the sealing member 30 to be sleeved on the piston body 10. The hollow portion 52 is spaced from the avoidance hole 51. The hollow portion 52 is arranged along the thickness direction of the support frame 301 (for example, Figure 14 The hollow portion 52 (in the up and down directions shown in FIG) penetrates the support frame 301, which can reduce the weight of the support frame 301, and the connection strength between the support frame 301 and the sealing body 302 can be improved through the hollow portion 52, ensuring a more reliable connection.

[0060] According to some embodiments of the present invention, Figure 16-18As shown, there are multiple (greater than or equal to two) hollow parts 52, and the multiple hollow parts 52 are spaced apart along the circumferential direction of the avoidance hole 51. The multiple hollow parts 52 can further reduce the weight of the support skeleton 301, which is beneficial to reducing production costs, and can effectively strengthen the connection strength between the support skeleton 301 and the sealing body 302 in the circumferential direction, ensuring a more reliable connection.

[0061] In some embodiments, as Figure 18 As shown, the hollow portion 52 is formed as a through hole, which makes the structure simple, facilitates processing and manufacturing, and helps reduce production costs.

[0062] Or, as Figure 16 and Figure 17 As shown, the support skeleton 301 includes an annular portion 53 and multiple extension portions 54. The annular portion 53 defines an avoidance hole 51. The multiple extension portions 54 are spaced apart along the circumferential direction of the annular portion 53, and the multiple extension portions 54 are all connected to the outer peripheral wall of the annular portion 53, ensuring that the structure of the support skeleton 301 is compact and effectively improving the structural strength of the support skeleton 301. At the same time, a hollow portion 52 is defined between two adjacent extension portions 54, which can ensure that the support skeleton 301 is reliably connected to the sealing body 302, thereby facilitating improving the connection strength between the support skeleton 301 and the sealing body 302.

[0063] In the embodiment of the present invention, the number of the extension portions 54 can be flexibly set according to actual conditions. For example, the extension portions 54 can be as follows: Figure 17 Eight are shown, but there may be two, three, four, five, six, seven, nine or more, all of which are within the scope of protection of the present invention.

[0064] In some embodiments of the present invention, Figures 1-9 As shown, at least one of the piston body 10 and the seal 30 is provided with an exhaust channel 40, that is, the piston body 10 may be provided with an exhaust channel 40, or the seal 30 may be provided with an exhaust channel 40, or both the piston body 10 and the seal 30 may be provided with an exhaust channel 40. One end of the exhaust channel 40 is located between the seal 30 and the fixing seat 20, and the other end of the exhaust channel 40 extends to the outer wall surface of the piston body 10 or the seal 30. As a result, the medium that enters between the seal 30 and the fixing seat 20 can be discharged through the exhaust channel 40 and will not accumulate between the seal 30 and the fixing seat 20. This solves the problem of the seal 30 being squeezed and deformed by the medium during use of the solenoid valve 200, thereby preventing the problem of the solenoid valve 200 failing due to the squeeze and deformation of the seal 30, and improving the reliability of the solenoid valve 200.

[0065] For example, when the temperature and pressure inside the solenoid valve 200 increase, the liquid medium between the seal 30 and the fixed seat 20 will turn into a gaseous medium, causing the volume and pressure of the medium to increase rapidly. The gaseous medium can be discharged through the exhaust channel 40, avoiding the medium from being trapped in a relatively sealed space and generating a large pressure, thereby avoiding squeezing the seal 30.

[0066] In the embodiment of the present invention, the extension of the exhaust passage 40 can be set according to actual conditions. For example, the exhaust passage 40 can extend along a straight line, a curve, or a broken line.

[0067] In some embodiments of the present invention, Figure 1-Figure 5 As shown, the fixing seat 20 and the piston body 10 are separate parts, which facilitates the processing and manufacturing of the fixing seat 20 and the piston body 10 respectively, and helps to reduce the complexity of the structure.

[0068] In addition, if Figure 4 As shown, when the exhaust passage 40 is provided in the piston body 10, a groove 13 is provided on the outer peripheral wall of the piston body 10, and the exhaust passage 40 is defined between the portion of the groove 13 and the fixing seat 20, and one end of the groove 13 is located on the side of the fixing seat 20 away from the seal 30 (for example Figure 2 The other end of the exhaust passage 40 extends to the end of the fixing seat 20 close to the sealing member 30 (eg Figure 2 ), which facilitates the discharge of the medium between the seal 30 and the fixing seat 20 through the exhaust channel 40, and the groove 13 is easy to process on the piston body 10, which is conducive to reducing production costs.

[0069] It should be noted that, for the convenience of description, the directions such as “upper” and “lower” in the present invention are based on the directions shown in the accompanying drawings, and are not limitations on the directions in actual application.

[0070] According to some embodiments of the present invention, Figures 1-4 As shown, the exhaust passage 40 is arranged along the axial direction of the piston body 10 (eg Figure 2 The exhaust passage 40 is extended in the vertical direction shown in the figure, which facilitates the processing of the exhaust passage 40 and can avoid obstruction to the flow of the medium, thereby ensuring smooth discharge of the medium.

[0071] In some embodiments of the present invention, Figures 1-4 As shown, a limiting boss 11 is provided on the outer peripheral wall of the piston body 10, and the end surface of the fixing seat 20 away from the sealing member 30 (eg Figure 2The upper end surface shown in FIG) abuts against the limiting boss 11, and the limiting boss 11 can limit the fixing seat 20, ensuring that the fixing seat 20 is reliably positioned on the piston body 10, and preventing the fixing member from moving on the piston body 10 and causing the sealing effect of the seal 30 to be poor, thereby ensuring the reliable sealing effect of the piston assembly 100. In addition, the end of the groove 13 away from the seal 30 (for example Figure 2 The upper end shown in FIG) extends to the limiting boss 11, which can prevent the limiting boss 11 from blocking the exhaust channel 40 and ensure that the medium flows out of the exhaust channel 40 smoothly.

[0072] According to some embodiments of the present invention, Figure 6-Figure 9 As shown, the seal 30 has an abutting area 31, which abuts against the valve port 78 of the solenoid valve 200 to ensure reliable sealing of the piston assembly 100. When the exhaust channel 40 is provided on the seal 30, one end of the exhaust channel 40 is located at the end surface of the seal 30 close to the fixing seat 20 (for example, Figure 7 ), and the other end of exhaust passage 40 extends to the outer wall surface of abutment region 31 on the side away from the central axis of seal 30. This facilitates the discharge of the medium between seal 30 and mounting base 20 through exhaust passage 40. Exhaust passage 40 is also easily machined on seal 30, which helps reduce production costs. Furthermore, when abutment region 31 abuts valve port 78, the medium is prevented from being discharged externally through exhaust passage 40, ensuring a good sealing effect for piston assembly 100.

[0073] It should be noted that “the other end of the exhaust passage 40 extends to the outer wall surface of the abutment area 31 on the side away from the central axis of the seal 30 ”, and the “outer wall surface” here can be the outer peripheral wall or end surface of the seal 30 .

[0074] In some embodiments of the present invention, Figure 6-Figure 8 As shown, the exhaust passage 40 is arranged along the axial direction of the seal 30 (eg Figure 7 The exhaust passage 40 is extended in the vertical direction shown in the figure, which facilitates the processing of the exhaust passage 40 and can avoid obstruction to the flow of the medium, thereby ensuring smooth discharge of the medium.

[0075] In the embodiment of the present invention, the specific connection method between the fixing seat 20 and the piston body 10 can be set according to actual conditions.

[0076] For example, in some embodiments, Figure 6 、 Figure 7 、 Figure 10 、 Figure 11 、 Figure 13 and Figure 14As shown, the fixing seat 20 and the piston body 10 are an integrated piece, so that the connection strength between the fixing seat 20 and the piston body 10 is high, the manufacturing is simple, and the assembly process is reduced, which is conducive to improving production efficiency.

[0077] Or, as Figure 1-Figure 3 As shown, the fixing seat 20 and the piston body 10 have an interference fit, which ensures that the fixing seat 20 is securely fixed on the piston body 10 and is not prone to loosening or falling off.

[0078] In some embodiments, a groove 13 is provided on the outer peripheral wall of the piston body 10, such as Figure 1-Figure 3 As shown, the fixing seat 20 and the piston body 10 have an interference fit, and the sealing member 30 and the fixing seat 20 have an interference fit, which can ensure that the fixing seat 20 is reliably fixed on the piston body 10, and the sealing member 30 and the fixing seat 20 are reliably fixed, which can ensure that the flatness of the contact end surfaces of the fixing seat 20 and the sealing member 30 is good, so that the fixing seat 20 and the sealing member 30 fit well, ensuring reliable sealing and reducing internal leakage.

[0079] Or, as Figure 1-Figure 3 As shown, the fixing seat 20 is welded to the piston body 10 to ensure that the fixing seat 20 and the piston body 10 are reliably connected, so that the fixing seat 20 is reliably fixed on the piston body 10 and is conducive to reducing production costs.

[0080] According to some embodiments of the present invention, Figure 1-Figure 3 、 Figure 5-Figure 7 、 Figure 10 、 Figure 11 、 Figure 13 and Figure 14 As shown, a limiting portion 21 is provided on the outer edge of the fixing seat 20, and the limiting portion 21 faces the direction close to the sealing member 30 (for example Figure 11 ), which is beneficial to improving the structural strength of the fixing seat 20, and the sealing member 30 is located on the inner side of the limiting portion 21. The limiting portion 21 can limit the sealing member 30, ensuring that the fixing seat 20 can limit the sealing member 30 reliably, thereby ensuring that the piston assembly 100 is sealed reliably.

[0081] In addition, if Figure 10 and Figure 11 As shown, a first flange 22 is provided on the free end of the limiting portion 21, and the first flange 22 is in contact with the end surface of the sealing member 30 away from the fixing seat 20 (eg Figure 11The lower end surface shown in the figure is offset against the lower end surface of the solenoid valve 20, and the fixation of the seal 30 can be strengthened by the first flange 22, which effectively improves the connection strength between the seal 30 and the fixing seat 20, makes the seal 30 and the fixing seat 20 fit more tightly and smoothly, avoids the problem of the outer edge of the seal 30 warping, and makes it difficult for the medium to enter between the seal 30 and the fixing seat 20, so that the seal 30 is not easily squeezed out or blown out by the medium during use of the solenoid valve 200, and can prevent the solenoid valve 200 from failing due to the seal 30 falling out or deforming, which is beneficial to improving the reliability of the solenoid valve 200 and improving the internal leakage performance level of the solenoid valve 200.

[0082] In some embodiments, when the fixing seat 20 is processed and formed, the first flange 22 has the same extension direction as the limiting portion 21. When the seal 30 is installed on the inner side of the limiting portion 21, the first flange 22 is riveted inward so that the first flange 22 presses the end face of the seal 30 away from the fixing seat 20 to achieve riveted fixation, ensure that the seal 30 is reliably fixed, and facilitate assembly and processing.

[0083] In some embodiments of the present invention, Figure 10-12 As shown, a protrusion 32 is provided on the outer peripheral wall of the seal 30 near one end of the fixed seat 20, and the protrusion 32 extends along the circumferential direction of the seal 30. The first flange 22 abuts against the end face of the protrusion 32 away from the fixed seat 20. While ensuring that the seal 30 is fixed reliably, the extension length of the limiting portion 21 can be reduced, thereby ensuring high structural strength and reducing the material used in the fixed seat 20, which is beneficial to reducing production costs. At the same time, when the piston assembly 100 is sealed, the first flange 22 can be avoided from interfering with other structures, thereby ensuring a good sealing effect.

[0084] In some embodiments of the present invention, Figure 1-Figure 3 、 Figure 6 、 Figure 7 、 Figure 10 、 Figure 11 、 Figure 13 and Figure 14 As shown, the piston body 10 is close to one axial end of the seal 30 (eg Figure 2 ) is provided with a second flange 12, which abuts against the end face of the seal 30 away from the fixing seat 20. The second flange 12 and the fixing seat 20 can achieve axial positioning of the seal 30, prevent the seal 30 from moving on the piston body 10, ensure that the seal 30 is securely fixed to the piston body 10, and thus ensure reliable sealing of the piston assembly 100. For example, the second flange 12 and the end face of the seal 30 away from the fixing seat 20 can be abutted by riveting.

[0085] In some embodiments, a first flange 22 is provided on the free end of the limiting portion 21, such as Figure 10 and Figure 11 As shown, the first flange 22 abuts against the end face of the seal 30 away from the fixed seat 20, and the second flange 12 abuts against the end face of the seal 30 away from the fixed seat 20, so that the radial inner side and the radial outer side of the seal 30 are both fixed, which can make the seal 30 fit more tightly and smoothly with the fixed seat 20, avoid the problem of the outer edge of the seal 30 warping, and make it difficult for the medium to enter between the seal 30 and the fixed seat 20, so that the seal 30 of the solenoid valve 200 is not easily affected by the medium and is squeezed out or blown out during use, and can prevent the solenoid valve 200 from failing due to the seal 30 falling out or deforming, which is beneficial to improving the reliability of the solenoid valve 200 and improving the internal leakage performance level of the solenoid valve 200.

[0086] According to some embodiments of the present invention, Figure 1-Figure 3 、 Figure 6 、 Figure 7 、 Figure 10 、 Figure 11 、 Figure 13 and Figure 14 As shown, a fixing gasket 60 is provided between the seal 30 and the second flange 12 along the axial direction of the piston body 10. The fixing gasket 60 can further fix the seal 30 to prevent the seal 30 from loosening due to vibration or impact. The fixing gasket 60 can absorb part of the vibration energy and play a buffering role, thereby avoiding damage to the seal 30 and helping to extend the service life.

[0087] In some embodiments, as Figure 2 、 Figure 7 、 Figure 11 and Figure 14 As shown, the outer peripheral wall of the fixed gasket 60 is located radially outside the outer peripheral wall of the second flange 12, so that the contact area between the fixed gasket 60 and the seal 30 is larger, which can improve the fixing reliability of the second flange 12 to the seal 30, thereby ensuring that the seal 30 is reliably fixed on the piston body 10.

[0088] The solenoid valve 200 according to the embodiment of the present invention includes a piston assembly 100 for the solenoid valve 200 according to the embodiment of the present invention. Since the piston assembly 100 for the solenoid valve 200 according to the embodiment of the present invention has the above-mentioned beneficial technical effects, the piston assembly 100 for the solenoid valve 200 according to the embodiment of the present invention is sleeved on the piston body 10 through the fixing seat 20 and the sealing member 30, and the sealing member 30 is against the fixing seat 20. The sealing member 30 includes a support frame 301 and a sealing body 302. The support frame 301 is arranged in the sealing body 302, which can enhance the strength and rigidity of the sealing member 30, so that the sealing member 30 and the fixing seat 20 fit more tightly and smoothly, making it difficult for the medium to enter between the sealing member 30 and the fixing seat 20, and increasing the ability of the sealing member 30 to resist deformation, which can effectively prevent the problem of failure of the solenoid valve 200 due to extrusion deformation of the sealing member 30, thereby improving the internal leakage performance level of the solenoid valve 200 and improving the reliability of the solenoid valve 200.

[0089] In some embodiments, as Figure 1 、 Figure 6 、 Figure 10 and Figure 13 As shown, the solenoid valve 200 includes a piston seat 75, on which is provided a valve port 78 and an inlet 73 and an outlet 74 connected to the valve port 78. The piston assembly 100 is movably arranged in the piston seat 75 along the axial direction of the piston assembly 100, so that the piston assembly 100 can be against the valve port 78, thereby enabling the piston assembly 100 to open or close the connection between the inlet 73 and the outlet 74, thereby meeting the control requirements of the solenoid valve 200.

[0090] In addition, if Figure 1 、 Figure 6 、 Figure 10 and Figure 13 As shown, the solenoid valve 200 further includes a valve seat 76, which is located on a side of the piston assembly 100 away from the valve port 78 (eg, Figure 1 ), the valve seat 76 is located in the piston seat 75 and is connected to the piston seat 75, which can confine the piston assembly 100 in the piston seat 75, prevent the piston assembly 100 from falling out of the piston seat 75, ensure the working reliability of the solenoid valve 200, and at the same time prevent external impurities from entering the piston assembly 100 and causing damage to the piston assembly 100, thereby ensuring the sealing reliability of the piston assembly 100.

[0091] In some embodiments, as Figure 1 、 Figure 6 、 Figure 10 and Figure 13As shown, a third sealing ring 83 is provided between the valve seat 76 and the piston seat 75. The third sealing ring 83 can achieve sealing between the valve seat 76 and the piston seat 75, preventing the medium from flowing out through the gap between the valve seat 76 and the piston seat 75, thereby ensuring reliable sealing.

[0092] In some embodiments, as Figure 1-Figure 3 、 Figure 6 、 Figure 7 、 Figure 10 、 Figure 11 、 Figure 13 and Figure 14 As shown, a fourth sealing ring 84 is provided between the piston assembly 100 and the valve seat 76. The fourth sealing ring 84 can achieve a seal between the piston assembly 100 and the valve seat 76, preventing the medium from flowing out through the gap between the piston assembly 100 and the valve seat 76, thereby ensuring a reliable seal. For example, the fourth sealing ring 84 can be a piston ring.

[0093] In some embodiments, as Figure 1 、 Figure 6 、 Figure 10 and Figure 13 As shown, the solenoid valve 200 includes a drive device 71, which can drive the piston assembly 100 to move along the axial direction of the piston assembly 100, meet the movement requirements of the piston assembly 100, and realize automatic control of the solenoid valve 200, making the control more convenient. For example, the drive device 71 can be an electromagnet assembly.

[0094] In some embodiments, as Figure 1 、 Figure 6 、 Figure 10 and Figure 13 As shown, the solenoid valve 200 further includes an elastic member 77, which is located in the piston seat 75, one end of the elastic member 77 is connected to the piston assembly 100, and the other end of the elastic member 77 is connected to the end of the piston seat 75 away from the valve seat 76 (for example Figure 1 The elastic member 77 is connected to the lower end of the valve opening 78, and the driving device 71 is connected to the lower end of the valve opening 78. The elastic member 77 can drive the piston assembly 100 to move away from the valve opening 78, and the driving device 71 can drive the piston assembly 100 to move toward the valve opening 78, thereby achieving communication and disconnection between the inlet 73 and the outlet 74, meeting the required control requirements, making the control simple, and helping to reduce production costs. For example, the elastic member 77 can be a tower spring.

[0095] In some embodiments, as Figure 1-Figure 3 、 Figure 6 、 Figure 7 、 Figure 10 、 Figure 11 、 Figure 13 and Figure 14As shown, the solenoid valve 200 further includes a pilot valve portion 72, which is provided on a side of the piston body 10 away from the seal 30 (eg Figure 2 ), the pilot valve is provided with a pilot valve port 721, and a portion of the drive device 71 abuts against the pilot valve port 721. By controlling the pilot valve port 721 through the drive device 71, different control requirements for the solenoid valve 200 can be achieved. For example, the pilot valve port 721 adjusts the opening and closing speed of the solenoid valve 200 by controlling the flow rate of the medium; alternatively, the pilot valve port 721 can precisely control the pressure of the medium by adjusting the opening degree.

[0096] In some embodiments, as Figure 1-Figure 3 、 Figure 6 、 Figure 7 、 Figure 10 、 Figure 11 、 Figure 13 and Figure 14 As shown, the pilot valve portion 72 is fixed to the piston body 10 by riveting, ensuring that the pilot valve portion 72 is securely fixed to the piston body 10 and facilitating assembly.

[0097] In some embodiments, the solenoid valve 200 further includes a valve block, and the piston seat 75 is disposed in the valve block. The valve block can protect the piston seat 75 to prevent the piston seat 75 from being exposed and damaged, thereby extending the service life of the solenoid valve 200.

[0098] In some embodiments, as Figure 1 、 Figure 6 、 Figure 10 and Figure 13 As shown, one end of the valve seat 76 close to the valve port 78 (eg Figure 1 A second sealing ring 82 is provided between the lower end (shown in the figure) and the valve block. The second sealing ring 82 can achieve sealing between the valve seat 76 and the valve block, preventing the medium from flowing out through the gap between the valve seat 76 and the valve block, and ensuring reliable sealing.

[0099] In some embodiments, as Figure 1 、 Figure 6 、 Figure 10 and Figure 13 As shown, the end of the valve seat 76 away from the valve port 78 (eg Figure 1 A first sealing ring 81 is provided between the upper end (as shown in the figure) and the valve block. The first sealing ring 81 can achieve sealing between the valve seat 76 and the valve block, preventing the medium from flowing out through the gap between the valve seat 76 and the valve block, and ensuring reliable sealing.

[0100] Other structures and operations of the piston assembly 100 and the solenoid valve 200 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0101] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0102] Throughout this specification, reference to terms such as "embodiment," "specific embodiment," and "example" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0103] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A piston assembly for a solenoid valve, characterized in that: include: Piston body; A fixing seat, the fixing seat being sleeved on the piston body; A sealing member is sleeved on the piston body and abuts against the fixing seat. The sealing member comprises a supporting frame and a sealing body. The supporting frame is arranged in the sealing body.

2. The piston assembly for a solenoid valve according to claim 1, characterized in that: The support frame and the sealing body are integrally injection-molded parts.

3. The piston assembly for a solenoid valve according to claim 2, characterized in that: The support frame is provided with an avoidance hole for avoiding the piston body and a hollow portion spaced apart from the avoidance hole, and the hollow portion penetrates the support frame along the thickness direction of the support frame.

4. The piston assembly for a solenoid valve according to claim 3, characterized in that: The hollow portions are multiple and spaced apart along the circumferential direction of the avoidance hole.

5. The piston assembly for a solenoid valve according to claim 3 or 4, characterized in that: The hollow portion is formed as a through hole; Alternatively, the support skeleton includes an annular portion and multiple extension portions, the annular portion defines the avoidance hole, the multiple extension portions are spaced apart along the circumferential direction of the annular portion and connected to the outer peripheral wall of the annular portion, and the hollow portion is defined between two adjacent extension portions.

6. The piston assembly for a solenoid valve according to claim 1, characterized in that At least one of the piston body and the seal is provided with an exhaust channel, one end of the exhaust channel is located between the seal and the fixing seat and the other end extends to the outer wall surface of the piston body or the seal.

7. The piston assembly for a solenoid valve according to claim 1, characterized in that A limiting portion extending toward the sealing member is provided on the outer edge of the fixing seat, and the sealing member is located on the inner side of the limiting portion. A first flange is provided on the free end of the limiting portion, and the first flange abuts against the end face of the sealing member away from the fixing seat.

8. The piston assembly for a solenoid valve according to claim 7, characterized in that: A protrusion extending along the circumferential direction of the sealing member is provided on the outer peripheral wall of one end of the sealing member close to the fixing seat, and the first flange abuts against the end surface of the protrusion away from the fixing seat.

9. The piston assembly for a solenoid valve according to claim 1, characterized in that: A second flange is provided at one axial end of the piston body close to the sealing member, and the second flange abuts against an end surface of the sealing member away from the fixing seat.

10. The piston assembly for a solenoid valve according to claim 9, characterized in that: A fixing gasket is provided between the sealing member and the second flange along the axial direction of the piston body.

11. A solenoid valve, characterized in that: The invention comprises a piston assembly for a solenoid valve according to any one of claims 1 to 10.

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