Valve needle assembly and electromagnetic valve

Abstract

The valve needle assembly comprises a valve needle shell, a connecting rod and a valve needle, a containing cavity is formed in the valve needle shell, and a first protruding part is arranged on the inner wall of the containing cavity; one end of the connecting rod is movably matched with the accommodating cavity; one end of the valve needle is movably matched with the containing cavity, one end of the valve needle elastically abuts against one end of the connecting rod, a second protruding part is formed at one end of the valve needle, and the second protruding part is in curved surface contact with the first protruding part. Therefore, the arrangement of the first protruding part and the second protruding part facilitates the simplification of the assembly of the valve needle and the valve needle shell, the curved surface contact between the first protruding part and the second protruding part can disperse the pressure on the contact surface, reduce the abrasion between parts, provide better stability, reduce the machining precision of the valve needle assembly, and enhance the sealing effect; the action of the valve needle is more stable and reliable, direct impact between parts can be reduced, and noise generated when the electromagnetic valve works is lowered.

Description

Technical Field

[0001] The invention relates to the technical field of solenoid valves, and in particular to a valve needle assembly and a solenoid valve. Background Art

[0002] In the prior art, in the existing electromagnetic zigzag valves, the valve needle and the screw are mostly rigidly or weakly rigidly connected. Since the valve needle assembly of the zigzag valve has more parts, this connection method leads to very high requirements on the processing and assembly accuracy of each part of the valve needle assembly in order to ensure the coaxiality of the valve needle assembly and thus realize its function, resulting in high difficulty and cost in the production of the valve. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the first object of the present invention is to provide a valve needle assembly that can reduce the machining accuracy of the solenoid valve and improve the stability and reliability of the solenoid valve.

[0004] A second object of the present invention is to provide a solenoid valve, comprising the valve needle assembly described in the above embodiment.

[0005] According to an embodiment of the first aspect of the present invention, the valve needle assembly comprises: a valve needle housing, a connecting rod and a valve needle, the valve needle housing forming a accommodating cavity, the inner wall of the accommodating cavity being provided with a first protrusion; one end of the connecting rod movably cooperates with the accommodating cavity; one end of the valve needle movably cooperates with the accommodating cavity, the one end of the valve needle and the one end of the connecting rod elastically stop each other, the one end of the valve needle is formed with a second protrusion, and the second protrusion is in curved surface contact with the first protrusion.

[0006] According to the valve needle assembly of an embodiment of the present invention, the provision of the first protrusion and the second protrusion facilitates to simplify the assembly of the valve needle and the valve needle housing. The curved contact between the first protrusion and the second protrusion can better disperse the pressure on the contact surface and reduce the wear between components. It can also provide better stability, reduce the machining accuracy of the valve needle assembly, enhance the sealing effect, ensure that the movement of the valve needle is more stable and reliable, and reduce the direct impact between components and reduce the noise generated when the solenoid valve is working.

[0007] In some embodiments, the first protrusion and the second protrusion are in spherical contact.

[0008] In some embodiments, the surface of the first raised portion facing the valve needle is a first curved surface, and the end of the first curved surface away from the inner wall of the accommodating cavity extends downwardly and tilted horizontally along the radial direction of the valve needle shell away from the center of the accommodating cavity; the surface of the second raised portion facing the side wall of the accommodating cavity is a second curved surface, and the shape of the second curved surface is adapted to the shape of the first curved surface.

[0009] In some embodiments, it also includes: a first elastic member, the first elastic member is arranged between the connecting rod and the valve needle; the one end of the valve needle cooperates with the first elastic member, and the outer peripheral surface of the one end of the valve needle cooperating with the first elastic member is a spherical surface.

[0010] In some embodiments, it also includes: a bearing assembly, the bearing assembly is arranged between the first elastic member and the one end of the connecting rod, the bearing assembly includes: a bearing and a bearing gasket, the bearing sleeve is arranged on the one end of the connecting rod, and the bearing cooperates with the inner wall of the accommodating cavity; the bearing gasket is arranged between the connecting rod and the first elastic member, and at least a part of the bearing gasket cooperates with the first elastic member.

[0011] In some embodiments, the valve needle includes: a guide portion and an adjustment portion, the guide portion is guided and cooperated with the inner wall of the accommodating cavity; the adjustment portion is arranged at the end of the guide portion away from the connecting rod, and the cross-sectional area of ​​the adjustment portion tends to decrease along the axial direction of the valve needle housing toward the end away from the guide portion.

[0012] In some embodiments, it further includes: a sealing member, wherein a sealing groove is formed on an outer peripheral wall of one end of the guide portion adjacent to the adjusting portion, and the sealing member is disposed in the sealing groove.

[0013] According to an embodiment of the second aspect of the present invention, an electromagnetic valve comprises: a valve body assembly, a valve port assembly and a valve needle assembly, wherein the valve body assembly is formed with at least one first connecting port and at least one second connecting port; the valve port assembly is arranged in the valve body assembly, and the valve port assembly is connected with the first connecting port and the second connecting port; the valve needle assembly is arranged in the valve body assembly, and the valve needle assembly, the valve port assembly and the valve body assembly movably cooperate to connect and shut off the first connecting port and the second connecting port, and the valve needle assembly is the valve needle assembly according to the embodiment of the first aspect of the present invention mentioned above.

[0014] In some embodiments, the valve port assembly includes: a valve port ring, a valve port seat and a second elastic member, the valve port seat cooperates with the valve port ring, and the valve port seat is connected with the first connecting port and the second connecting port; the second elastic member is arranged at one end of the valve port ring away from the valve port seat, and the two ends of the second elastic member are respectively connected to the valve port ring and the valve body assembly.

[0015] In some embodiments, it also includes: a valve port gasket, which is arranged between the valve port seat and the valve body assembly, and the valve port seat and the valve port gasket are detachably matched.

[0016] In some embodiments, one of the first communicating port and the second communicating port is opposite to the valve port seat along the radial direction of the valve needle housing; the other of the first communicating port and the second communicating port is opposite to the valve port seat along the axial direction of the valve needle, and the valve port gasket is arranged adjacent to one of the first communicating port and the second communicating port that is opposite to the valve port seat along the axial direction of the valve needle housing.

[0017] In some embodiments, the valve port gasket is a polytetrafluoroethylene member.

[0018] In some embodiments, it further includes: a drive assembly, wherein the drive assembly is disposed in the valve body assembly, and the drive assembly is connected to the connecting rod to drive the connecting rod to move axially in the valve needle housing.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be 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 easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a schematic diagram of a solenoid valve according to an embodiment of the present invention;

[0022] Figure 2 is a cross-sectional schematic diagram of a solenoid valve according to an embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of assembling a valve needle assembly and a valve port assembly according to an embodiment of the present invention;

[0024] Figure 4 is a schematic cross-sectional view of the assembly of a valve needle assembly and a valve port assembly according to an embodiment of the present invention;

[0025] Figure 5 is a schematic diagram of a valve needle assembly according to an embodiment of the present invention;

[0026] Figure 6 is a cross-sectional schematic diagram of a valve needle assembly according to an embodiment of the present invention;

[0027] Figure 7 is a schematic diagram of a valve port assembly according to an embodiment of the present invention;

[0028] Figure 8 4 is a cross-sectional schematic diagram of a valve port assembly according to an embodiment of the present invention.

[0029] Reference numerals:

[0030] 100. Solenoid valve;

[0031] 10. Valve body assembly; 11. First communication port; 12. Second communication port; 13. Valve body cavity;

[0032] 20. Valve port assembly; 21. Valve port ring; 22. Second elastic member; 23. Valve port seat; 24. Third connecting port; 25. Fourth connecting port; 26. Valve port gasket;

[0033] 30. Valve needle assembly; 31. Connecting rod; 32. Valve needle housing; 321. First protrusion; 322. Accommodation chamber; 33. Valve needle; 331. Second protrusion; 332. Guide; 333. Adjustment; 334. Sealing member; 34. First elastic member; 35. Bearing assembly; 351. Bearing; 352. Bearing gasket;

[0034] 40. Drive assembly;

[0035] A. Axial direction; B. Radial direction. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 8 The valve needle assembly 30 according to the embodiment of the present invention is described, comprising: a valve needle housing 32, a connecting rod 31 and a valve needle 33. The valve needle assembly 30 has an axial direction A and a radial direction B.

[0037] Specifically, if Figure 1-Figure 8 As shown, the valve needle housing 32 is formed with an accommodating cavity 322, and a first protrusion 321 is provided on the inner wall of the accommodating cavity 322; one end of the connecting rod 31 is movably engaged with the accommodating cavity 322; one end of the valve needle 33 is movably engaged with the accommodating cavity 322, one end of the valve needle 33 and one end of the connecting rod 31 are elastically stopped, and a second protrusion 331 is formed at one end of the valve needle 33, and the second protrusion 331 is in curved contact with the first protrusion 321.

[0038] Combination Figure 1-Figure 8 The needle housing 32, the connecting rod 31 and the needle 33 all extend along the axial direction A of the needle assembly 30. The needle housing 32 defines an accommodating chamber 322 inside. The accommodating chamber 322 is suitable for cooperating with the connecting rod 31 and the needle 33. One end of the connecting rod 31 along the axial direction A is suitable for movably cooperating with one end of the accommodating chamber 322 along the axial direction. One end of the needle 33 along the axial direction A is suitable for movably cooperating with the other end of the accommodating chamber 322 along the axial direction. One end of the connecting rod 31 along the axial direction A elastically stops with one end of the needle 33 along the axial direction A. The connecting rod 31 can undergo a certain displacement along the axial direction A in the accommodating chamber 322. The connecting rod 31 can transmit external power to the needle 33, thereby driving the needle 33 to move.

[0039] A first protrusion 321 is formed on the inner wall of the accommodating cavity 322. The first protrusion 321 is formed by at least a portion of the surface of the inner wall of the accommodating cavity 322 protruding in the direction of the central axis of the accommodating cavity 322. The first protrusion 321 is disposed on the inner wall of the accommodating cavity 322 in a circumferential direction of the accommodating cavity 322. The valve needle 33 is provided with a second protrusion 331 formed on one end of the accommodating cavity 322 along the axial direction A. The second protrusion 331 is formed by at least a portion of the surface of the outer circumferential surface of the valve needle 33 protruding in a direction away from the center line of the valve needle 33. The second protrusion 331 is disposed on the outer circumferential surface of the accommodating cavity 322 in a circumferential direction of the valve needle 33. The first protrusion 321 is suitable for forming a curved surface contact with the second protrusion 331.

[0040] According to the valve needle assembly 30 of the embodiment of the present invention, the provision of the first protrusion 321 and the second protrusion 331 facilitates to simplify the assembly of the valve needle 33 and the valve needle housing 32. The curved contact between the first protrusion 321 and the second protrusion 331 can better disperse the pressure on the contact surface and reduce the wear between components. It can also provide better stability, reduce the processing accuracy of the valve needle assembly 30, enhance the sealing effect, ensure that the movement of the valve needle 33 is more stable and reliable, and can also reduce the direct impact between components and reduce the noise generated when the solenoid valve 100 is working.

[0041] According to some embodiments of the present invention, Figure 3-Figure 6 As shown, the first protrusion 321 and the second protrusion 331 are in spherical contact.

[0042] The outer peripheral side surface of one of the first protrusion 321 and the second protrusion 331 is formed as a convex spherical surface, and the outer peripheral side surface of the other of the first protrusion 321 and the second protrusion 331 is formed as a concave spherical surface, and a spherical contact relationship is formed between the first protrusion 321 and the second protrusion 331. Spherical contact allows the valve needle 33 to be fine-tuned in multiple directions. The setting of spherical contact allows the valve needle 33 to rotate or deflect freely within a certain range, so that the valve needle 33 can adjust its position more flexibly under the action of external force to achieve the best sealing effect. Spherical contact can disperse the pressure on the contact surface, reduce the formation of local high stress points, and thus reduce the wear rate. Spherical contact can provide better stability. The spherical surface provides a continuous contact surface. Even when the position of the valve needle 33 changes slightly, it can maintain a good contact state, ensuring that the movement of the valve needle assembly 30 is more stable and reliable. Spherical contact can reduce the direct impact between components and can reduce the noise generated when the valve needle assembly 30 is working to a certain extent.

[0043] Therefore, the spherical contact between the first protrusion 321 and the second protrusion 331 can ensure that the valve needle assembly 30 maintains good performance in long-term use, improve the flexibility and reliability of the valve needle assembly 30 during operation, reduce wear and maintenance costs, and extend the service life of the valve needle assembly 30.

[0044] According to some embodiments of the present invention, Figure 3-Figure 6 As shown, the side surface of the first protrusion 321 facing the valve needle 33 is a first curved surface, and the end of the first curved surface away from the inner wall of the accommodating cavity 322 extends downwardly and tilted horizontally along the radial direction of the valve needle housing 32 toward the center away from the accommodating cavity 322; the side surface of the second protrusion 331 facing the side wall of the accommodating cavity 322 is a second curved surface, and the shape of the second curved surface is adapted to the shape of the first curved surface.

[0045] The first curved surface of the first protrusion 321 is suitable for forming a good contact and match with the second curved surface of the second protrusion 331. The first curved surface and the second curved surface are arranged to extend obliquely, which helps to guide the movement direction of the valve needle 33, so that it can move smoothly along the predetermined direction when opening and closing, avoiding unnecessary deviation or jamming. The first curved surface and the second curved surface are adapted to each other, and even when the valve needle assembly 30 is subjected to external interference or vibration, it can automatically adjust to the correct position through the guiding effect of the curved surface, thereby improving the sealing performance.

[0046] Thus, the arrangement of the first curved surface and the second curved surface can ensure that the valve needle 33 can move smoothly during the opening and closing process, and can automatically adjust to the correct position through the guiding effect of the curved surface even when the valve needle assembly 30 is subject to external interference or vibration. Good curved surface matching can ensure that the valve needle 33 fits tightly in the closed state, improve the sealing effect, and reduce the possibility of leakage. The design of the first curved surface and the second curved surface optimizes the mechanical properties of the valve needle assembly 30 and improves the overall reliability and durability of the valve needle assembly 30.

[0047] According to some embodiments of the present invention, Figure 3-Figure 6 As shown, it also includes: a first elastic member 34, which is arranged between the connecting rod 31 and the valve needle 33; one end of the valve needle 33 cooperates with the first elastic member 34, and the outer peripheral surface of the one end of the valve needle 33 and the first elastic member 34 is a spherical surface.

[0048] The first elastic member 34 extends along the axial direction A, and one end of the connecting rod 31 adjacent to the valve needle 33 along the axial direction A is provided on the third protrusion. The third protrusion is formed by a portion of an end surface of the valve needle 33 adjacent to the connecting rod 31 along the axial direction A protruding toward the side where the connecting rod 31 is located. The outer peripheral surface of the third protrusion is formed as a spherical surface, and one end of the first elastic member 34 along the axial direction contacts and stops with the outer peripheral surface of the third protrusion.

[0049] Therefore, the first elastic member 34 is arranged between the connecting rod 31 and the valve needle 33, and plays the role of buffering and resetting. The outer peripheral surface of one end of the valve needle 33 that cooperates with the first elastic member 34 is a spherical surface, so that the valve needle 33 can automatically adjust the angle within a certain range when contacting the first elastic member 34 to adapt to forces in different directions, which helps to compensate for tolerances in the manufacturing and assembly process and reduce the difficulty of assembling the valve needle assembly 30.

[0050] According to some embodiments of the present invention, Figure 3-Figure 6 As shown, it also includes: a bearing assembly 35, the bearing assembly 35 is arranged between the first elastic member 34 and one end of the connecting rod 31, and the bearing assembly 35 includes: a bearing 351 and a bearing gasket 352, the bearing 351 is sleeved on one end of the connecting rod 31, and the bearing 351 cooperates with the inner wall of the accommodating cavity 322; the bearing gasket 352 is arranged between the connecting rod 31 and the first elastic member 34, and at least a part of the bearing gasket 352 cooperates with the first elastic member 34.

[0051] The bearing 351 is sleeved on one end of the connecting rod 31 adjacent to the valve needle assembly 30 in the axial direction. The arrangement of the bearing 351 enables the connecting rod 31 to slide smoothly inside the valve needle housing 32 during movement, thereby reducing friction and wear. A bearing washer 352 is provided at one end of the connecting rod 31 adjacent to the valve needle 33 in the axial direction A. The side of the bearing washer 352 away from the connection is suitable for contacting and matching with the other end of the first elastic member 34 in the axial direction A.

[0052] Therefore, the main function of the bearing 351 is to reduce the friction between the connecting rod 31 and the inner wall of the valve needle housing 32, and to improve the smoothness and stability of the movement of the connecting rod 31. The use of the bearing 351 makes the connecting rod 31 smoother when moving, and makes the valve needle assembly 30 react faster when opening and closing. The bearing gasket 352 is suitable for forming a buffer layer between the connecting rod 31 and the first elastic member 34, reducing the direct contact between the connecting rod 31 and the first elastic member 34, protecting the first elastic member 34 from direct mechanical impact, and preventing the elastic member from deformation or fatigue damage due to long-term pressure. The bearing gasket 352 can also help evenly distribute the force of the first elastic member 34 and improve the stability of the system. The combined use of the bearing 351 and the bearing gasket 352 makes the connecting rod 31 more stable during movement, reduces shaking and unnecessary displacement, and improves the overall reliability and precision of the valve needle assembly 30.

[0053] According to some embodiments of the present invention, Figure 3-Figure 6 As shown, the valve needle 33 includes: a guide portion 332 and an adjusting portion 333, the guide portion 332 is guided and cooperated with the inner wall of the accommodating chamber 322; the adjusting portion 333 is arranged at the end of the guide portion 332 away from the connecting rod 31, and the cross-sectional area of ​​the adjusting portion 333 along the axial direction of the valve needle housing 32 toward the end away from the guide portion 332 tends to decrease.

[0054] The guide portion 332 extends along the axial direction A. The guide portion 332 is suitable for guiding and cooperating with the inner wall of the accommodating chamber 322. The guide portion 332 enables the valve needle 33 to move relative to the valve needle housing 32 along the axial direction A in the accommodating chamber 322. The adjusting portion 333 is provided at one end of the guide portion 332 away from the connecting rod 31. The adjusting portion 333 is in the shape of a cone-shaped structure or other similar gradual structures. The adjusting portion 333 is suitable for cooperating with the communication port. Due to its gradually decreasing cross-sectional area, the valve needle 33 can control the opening size of the communication port when it moves, thereby accurately controlling the flow rate of the fluid.

[0055] Therefore, the main function of the guide portion 332 is to ensure that the valve needle 33 can move in the correct direction during movement, reduce deviation, and improve the stability and accuracy of the movement of the valve needle 33. The cross-sectional area of ​​the end of the adjustment portion 333 facing away from the guide portion 332 is gradually reduced along the axial direction, so that the valve needle assembly 30 can achieve more accurate flow control.

[0056] According to some embodiments of the present invention, Figure 3-Figure 6 As shown, it also includes: a sealing member 334. A sealing groove is formed on the outer peripheral wall of one end of the guide portion 332 adjacent to the adjusting portion 333, and the sealing member 334 is arranged in the sealing groove.

[0057] The sealing groove extends along the circumference of the guide portion 332 . The sealing groove is formed by at least a portion of the surface of the outer peripheral wall of the guide portion 332 being recessed toward the central axis of the guide portion 332 . The sealing member 334 is suitable for being embedded and assembled in the sealing groove.

[0058] Therefore, the setting of the sealing groove is suitable for assembling the sealing member 334, ensuring that when the valve needle 33 is in the closed position, the sealing member 334 is suitable for abutting against other components to form a good seal, and the sealing member 334 can fit closely with other components to form an effective seal, reduce fluid leakage, and improve the sealing performance of the valve needle assembly 30. The setting of the sealing member 334 can also reduce the direct contact between the valve needle 33 and other components, thereby reducing wear and tear, and facilitate maintenance, which helps to extend the service life of the valve needle assembly 30.

[0059] According to the solenoid valve 100 in the embodiment of the second aspect of the present invention, Figure 1-Figure 8 As shown, the solenoid valve 100 includes: a valve body assembly 10, a valve port assembly 20 and a valve needle assembly 30. The valve body assembly 10 is formed with at least one first communication port 11 and at least one second communication port 12; the valve port assembly 20 is arranged in the valve body assembly 10, and the valve port assembly 20 is communicated with the first communication port 11 and the second communication port 12; the valve needle assembly 30 is arranged in the valve body assembly 10, and the valve needle assembly 30, the valve port assembly 20 and the valve body assembly 10 are movably matched to connect and shut off the first communication port 11 and the second communication port 12, and the valve needle assembly 30 is the valve needle assembly 30 according to the embodiment of the first aspect of the present invention.

[0060] The valve body assembly 10 defines a valve body cavity 13 inside, and the valve port assembly 20 and the valve needle assembly 30 are arranged in the valve body cavity 13. The valve port assembly 20 and the valve needle assembly 30 can move in the valve body cavity 13. The valve port assembly 20 and the valve needle assembly 30 can move relative to the solenoid valve 100 along the axial direction A in the valve body cavity 13 to achieve the connection and disconnection of the first communication port 11 and the second communication port 12. The first communication port 11 and the second communication port 12 are suitable for communicating with an external pipeline or system to facilitate the fluid to enter and exit the solenoid valve 100.

[0061] According to the solenoid valve 100 of the embodiment of the present invention, by applying the valve needle assembly 30 in the above embodiment, the design of the curved contact between the second protrusion 331 and the first protrusion 321 in the valve needle assembly 30 can reduce the friction and direct impact between the internal components of the solenoid valve 100, extend the service life of the solenoid valve 100, improve the stability of the valve needle 33 during movement, ensure its movement is more stable and reliable, and improve the overall reliability of the solenoid valve 100.

[0062] According to some embodiments of the present invention, Figure 3-Figure 8 As shown, the valve port assembly 20 includes: a valve port ring 21, a valve port seat 23 and a second elastic member 22. The valve port seat 23 cooperates with the valve port ring 21, and the valve port seat 23 is connected to the first connecting port 11 and the second connecting port 12; the second elastic member 22 is arranged at one end of the valve port ring 21 away from the valve port seat 23, and the two ends of the second elastic member 22 are respectively connected to the valve port ring 21 and the valve body assembly 10.

[0063] One end of the valve ring 21 along the axial direction A is suitable for matching with the valve seat 23, and one end of the valve seat 23 along the axial direction A is inserted in the valve ring 21. The other end of the valve ring 21 along the axial direction A is suitable for matching with the second elastic member 22, which extends along the axial direction A. One end of the second elastic member 22 along the axial direction A is embedded in the other end of the valve ring 21 along the axial direction A away from the valve seat 23. The other end of the second elastic member 22 along the axial direction A is abutted against the valve body assembly 10. A communication channel is formed in the valve seat 23, and at least part of the valve needle 33 is matched in the communication channel of the valve seat 23. The valve seat 23 is formed with a third communication port 24 and a fourth communication port 25, the third communication port 24 is opposite to the valve needle 33 along the radial direction of the valve needle 33, the fourth communication port 25 is opposite to the valve needle 33 along the axial direction of the valve needle 33, and the adjustment portion 333 of the valve needle 33 is suitable for detachably matching with the valve seat 23.

[0064] Therefore, the setting of the second elastic member 22 can ensure the close fit between the valve seat 23 and the valve body assembly 10, so that the valve seat 23 can quickly return to the initial position when not subjected to external force, which helps to improve the response speed and operating efficiency of the solenoid valve 100.

[0065] According to some embodiments of the present invention, Figure 2 As shown, it also includes: a valve port gasket 26, which is arranged between the valve port seat 23 and the valve body assembly 10, and the valve port seat 23 and the valve port gasket 26 are detachably matched.

[0066] The valve gasket 26 is arranged on the end face of the valve seat 23 away from the second elastic member 22 along the axial direction A. When the end of the valve seat 23 away from the second elastic member contacts the valve body assembly 10, the valve gasket 26 is arranged between the valve seat 23 and the valve body assembly 10 to play a certain buffering role. The valve gasket 26 can avoid direct contact between the valve seat 23 and the valve body assembly 10, thereby reducing wear. The valve gasket 26 can also increase the sealing between the valve seat 23 and the valve body assembly 10. By adding a gasket between the two components, any small gaps or uneven places can be filled, thereby improving the overall sealing effect. By providing the valve gasket 26, it can be ensured that the sealing effect between the valve seat 23 and the valve body assembly 10 is still good even after long-term use, thereby improving the reliability and stability of the solenoid valve 100.

[0067] According to some embodiments of the present invention, Figure 1-Figure 8 As shown, one of the first communicating port 11 and the second communicating port 12 is opposite to the valve port seat 23 along the radial direction of the valve needle housing 32; the other of the first communicating port 11 and the second communicating port 12 is opposite to the valve port seat 23 along the axial direction of the valve needle housing 32, and the valve port gasket 26 is arranged adjacent to one of the first communicating port 11 and the second communicating port 12 that is opposite to the valve port seat 23 along the axial direction of the valve needle housing 32.

[0068] It is assumed that the first connecting port 11 is opposite to the valve port seat 23 along the radial direction of the valve needle housing 32, the second connecting port 12 is opposite to the valve port seat 23 along the axial direction of the valve needle housing 32, the valve port gasket 26 is arranged adjacent to the second connecting port 12, and the valve port gasket 26 is arranged along the circumference of the valve needle housing 32 and opposite to one end of the valve port seat 23 along the axial direction A away from the second elastic member 22.

[0069] Thus, the arrangement of the first communication port 11 and the second communication port 12 can accurately control the direction of fluid inflow and outflow, which helps to optimize the fluid path and reduce the resistance loss of the fluid during the switching process. The valve port gasket 26 is arranged near one of the communication ports, which can provide an additional sealing effect at the position adjacent to the communication port and the valve port seat 23, further reducing the risk of fluid leakage. By reasonably arranging the positions of the first communication port 11 and the second communication port 12 and arranging the valve port gasket 26 at an appropriate position, it can be ensured that the solenoid valve 100 maintains good sealing performance under various working conditions, thereby improving its overall reliability and service life.

[0070] According to some embodiments of the present invention, the valve port gasket 26 is a polytetrafluoroethylene member.

[0071] PTFE is extremely chemically inert and does not react with any chemicals. It has excellent chemical stability. PTFE can withstand a high temperature range and is suitable for high or low temperature environments. PTFE has a very low friction coefficient, which makes it a good lubricant between moving parts, reducing wear and extending the service life of equipment. Other substances are not easy to adhere to the surface of PTFE, and fluids are not easy to deposit on its surface, which is conducive to keeping it clean and reducing maintenance workload.

[0072] Therefore, the valve port gasket 26 is a polytetrafluoroethylene member with good chemical stability and low friction coefficient, which can provide excellent sealing performance and reduce fluid leakage. The wear resistance and corrosion resistance of the polytetrafluoroethylene member enable the valve port gasket 26 to maintain a good sealing effect after long-term use, thereby extending the service life of the solenoid valve 100. Using polytetrafluoroethylene as the valve port gasket 26 can ensure that the solenoid valve 100 can maintain stable performance under various working conditions and improve the overall reliability of the system.

[0073] According to some embodiments of the present invention, Figure 1-Figure 8 As shown, as shown, it also includes: a driving assembly 40, which is disposed in the valve body assembly 10, and the driving assembly 40 is connected to the connecting rod 31 to drive the connecting rod 31 to move axially in the valve needle housing 32.

[0074] The drive assembly 40 generally includes an electromagnetic coil. When the electromagnetic coil is energized, a magnetic field is generated, thereby attracting or repelling the connecting rod 31 connected thereto. This electromagnetic force can drive the connecting rod 31 to move in the axial direction of the valve needle housing 32, thereby controlling the opening or closing of the valve needle 33. The electromagnetic drive assembly 40 can respond quickly to electrical signals, so that the electromagnetic valve 100 can complete the opening or closing action in a short time, thereby improving the response speed of the system. By accurately controlling the current intensity and power-on time of the electromagnetic coil, the moving distance of the connecting rod 31 can be accurately controlled, thereby realizing accurate adjustment of the opening degree of the valve needle 33.

[0075] Therefore, by arranging the driving assembly 40 inside the valve body assembly 10 and connecting it with the connecting rod 31, the solenoid valve 100 can achieve fast and accurate control, thereby improving the response speed and reliability of the system.

[0076] Specifically, combined Figure 1-Figure 8 , the working principle of the solenoid valve 100 is as follows:

[0077] When the solenoid valve 100 is in a closed state, the valve seat 23 fits tightly with the valve body assembly 10 under the pressure of the second elastic member 22, and the valve needle assembly 30 cooperates with the valve seat assembly 20, thereby cutting off the flow channel in the valve seat 23, that is, the contact surface between the valve needle 33 and the valve seat 23 forms a seal, thereby realizing two-way closure of the flow channel.

[0078] When the solenoid valve 100 is in a low flow condition, the coil in the solenoid valve 100 will be energized to generate a magnetic field to drive the drive assembly 40. The drive assembly 40 drives the valve needle assembly 30 to rotate and move upward along its axis through the connecting rod 31, so that the valve needle 33 is separated from the fourth communication port 25 of the valve seat 23, and the third communication port 24 is connected to the fourth communication port 25. The third communication port 24 of the valve seat 23 is opposite to and connected to the first communication port 11 of the valve body assembly 10 along the radial direction B of the solenoid valve 100, and the fourth communication port 25 of the valve seat 23 is suitable for being opposite to and connected to the second communication port 12 of the valve body assembly 10, that is, the first communication port 11, the third communication port 24, the fourth communication port 25 and the second communication port 12 are connected to each other to form a complete flow channel. Among them, the variable cross-section design of the adjustment part 333 of the valve needle 33 allows the flow rate of the fluid to be adjusted by changing the position of the valve needle 33, so as to achieve fluid regulation under low flow conditions.

[0079] When the solenoid valve 100 is in a high flow condition, the valve needle assembly 30 will continue to move upward along the axis. After the annular outer periphery of the valve needle housing 32 contacts the valve port ring 21, the valve needle housing 32 will exert an upward force on the valve port assembly 20. At this time, the valve port assembly 20 will overcome the influence of the downward spring force of the second elastic member 22 under the action of the valve needle assembly 30, and move upward with the valve needle assembly 30. As the valve port assembly 20 moves upward, the first connecting port 11 of the valve body assembly 10 is connected to the second connecting port 12, which can increase the flow rate of the fluid. In this process, the valve needle assembly 30 and the valve port assembly 20 remain in a relatively static state, and they move upward as a whole. By controlling the moving distance of the valve needle assembly 30 and the valve port assembly 20, flow regulation under high flow conditions can be achieved.

[0080] When the solenoid valve 100 changes from a high flow rate working condition to a low flow rate working condition or is closed, the driving assembly 40 moves downward along the axis and drives the valve needle assembly 30 to move downward. At the same time, the valve port assembly 20 also starts to move downward under the elastic force of the second elastic member 22 of the valve port spring. When the valve needle 33 seat contacts the valve body assembly 10, the high flow rate mode is closed, and the valve needle assembly 30 continues to move downward until the valve needle 33 contacts the valve needle 33 seat to form a seal, thereby cutting off the flow channel and realizing the two-way closure of the flow channel.

[0081] 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 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0082] In the description of the present invention, "first feature" and "second feature" may include one or more of the features. In the description of the present invention, "plurality" means two or more. In the description of the present invention, a first feature "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. In the description of the present invention, a first feature "above", "above" and "above" a second feature may include the first feature being directly above and obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature.

[0083] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0084] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A valve needle assembly, characterized in that: include: A valve needle housing (32), wherein the valve needle housing (32) is formed with a receiving cavity (322), and a first protrusion (321) is provided on the inner wall of the receiving cavity (322); A connecting rod (31), one end of which is movably matched with the accommodating cavity (322); A valve needle (33), one end of the valve needle (33) is movably engaged with the accommodating cavity (322), the one end of the valve needle (33) and the one end of the connecting rod (31) are elastically abutted, the one end of the valve needle (33) is formed with a second protrusion (331), and the second protrusion (331) and the first protrusion (321) are in curved contact.

2. The valve needle assembly according to claim 1, characterized in that: The first protrusion (321) and the second protrusion (331) are in spherical contact.

3. The valve needle assembly according to claim 1, characterized in that: A surface of the first protrusion (321) facing the valve needle (33) is a first curved surface, and an end of the first curved surface away from the inner wall of the accommodating cavity (322) extends downwardly and tiltedly along the radial direction of the valve needle housing (32) away from the center of the accommodating cavity (322); A surface of one side of the second protruding portion (331) facing the side wall of the accommodating cavity (322) is a second curved surface, and the shape of the second curved surface matches the shape of the first curved surface.

4. The valve needle assembly according to claim 1, characterized in that: Also includes: a first elastic member (34), the first elastic member (34) being arranged between the connecting rod (31) and the valve needle (33); The one end of the valve needle (33) cooperates with the first elastic member (34), and the outer peripheral surface of the one end of the valve needle (33) and the first elastic member (34) that cooperates is a spherical surface.

5. The valve needle assembly according to claim 4, characterized in that: Also includes: A bearing assembly (35), the bearing assembly (35) being arranged between the first elastic member (34) and the one end of the connecting rod (31), the bearing assembly (35) comprising: A bearing (351), wherein the bearing (351) is sleeved on the one end of the connecting rod (31), and the bearing (351) is matched with the inner wall of the accommodating cavity (322); A bearing gasket (352), wherein the bearing gasket (352) is disposed between the connecting rod (31) and the first elastic member (34), and at least a portion of the bearing gasket (352) cooperates with the first elastic member (34).

6. The valve needle assembly according to claim 1, characterized in that: The valve needle (33) comprises: A guide portion (332), the guide portion (332) being in guiding cooperation with an inner wall of the accommodating cavity (322); An adjusting portion (333), wherein the adjusting portion (333) is disposed at an end of the guide portion (332) away from the connecting rod (31), and the cross-sectional area of ​​the adjusting portion (333) along the axial direction of the valve needle housing (32) toward an end away from the guide portion (332) tends to decrease.

7. The valve needle assembly according to claim 6, characterized in that: Also includes: A sealing member (334) is formed with a sealing groove on the outer peripheral wall of one end of the guide portion (332) adjacent to the adjusting portion (333), and the sealing member (334) is arranged in the sealing groove.

8. A solenoid valve (100), characterized in that: include: A valve body assembly (10), wherein the valve body assembly (10) is formed with at least one first communication port (11) and at least one second communication port (12); a valve port assembly (20), wherein the valve port assembly (20) is arranged in the valve body assembly (10), and the valve port assembly (20) is in communication with the first communication port (11) and the second communication port (12); A valve needle assembly (30), wherein the valve needle assembly (30) is disposed in the valve body assembly (10), wherein the valve needle assembly (30), the valve port assembly (20) and the valve body assembly (10) movably cooperate to connect and disconnect the first connecting port (11) and the second connecting port (12), and the valve needle assembly (30) is a valve needle assembly (30) according to any one of claims 1 to 7.

9. The solenoid valve (100) according to claim 8, characterized in that: The valve port assembly (20) comprises: Valve port ring (21); a valve seat (23), the valve seat (23) being matched with the valve ring (21), the valve seat (23) being connected with the first communication port (11) and the second communication port (12); A second elastic member (22), wherein the second elastic member (22) is arranged at one end of the valve port ring (21) away from the valve port seat (23), and the two ends of the second elastic member (22) are respectively connected to the valve port ring (21) and the valve body assembly (10).

10. The solenoid valve (100) according to claim 9, characterized in that: Also includes: A valve port gasket (26) is provided between the valve port seat (23) and the valve body assembly (10), and the valve port seat (23) and the valve port gasket (26) are detachably matched.

11. The solenoid valve (100) according to claim 10, characterized in that: One of the first communicating port (11) and the second communicating port (12) is opposite to the valve port seat (23) along the radial direction of the valve needle housing (32); the other of the first communicating port (11) and the second communicating port (12) is opposite to the valve port seat (23) along the axial direction of the valve needle (33), and the valve port gasket (26) is arranged adjacent to one of the first communicating port (11) and the second communicating port (12) which is opposite to the valve port seat (23) along the axial direction of the valve needle housing (32).

12. The solenoid valve (100) according to claim 10, characterized in that: The valve port gasket (26) is a polytetrafluoroethylene member.

13. The solenoid valve (100) according to claim 8, characterized in that: Also includes: A drive assembly (40), wherein the drive assembly (40) is disposed in the valve body assembly (10), and the drive assembly (40) is connected to the connecting rod (31) to drive the connecting rod (31) to move axially in the valve needle housing (32).

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