Piston seatless joint type electromagnetic valve

Abstract

The utility model relates to solenoid valve structure technical field especially relates to a piston seat clamping type solenoid valve without, include: valve seat, valve core subassembly and set up at the joint of valve seat and valve core subassembly's clamping assembly, valve core subassembly includes coaxial setting static core and moving core and is used for driving moving core to realize the drive subassembly of valve port opening or closing, valve seat is equipped with the installation groove that clamping assembly is embedded, is equipped with ring groove on the lateral wall of installation groove, clamping assembly includes the connecting disc and the clamping spring, the central hole of connecting disc adopts the interference fit with static core, the clamping spring is installed in ring groove, its outside wall is closely butt on the lateral wall of ring groove, the inner hole diameter of clamping spring is less than the outer circle diameter of connecting disc. Through connecting disc and static core interference fit, the piston seat is saved, reduces the processing difficulty and equipment requirement, further saves the processing cost, and the clamping structure of clamping spring and connecting disc simplifies the assembly procedure of valve seat and valve core subassembly, shortens the assembly period, improves the production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve structure technology, and in particular to a piston-seat-less snap-fit ​​electromagnetic valve. Background Technology

[0002] Solenoid valves, as a common fluid control element, are widely used in industrial automation, hydraulic transmission, pneumatic systems and other fields. They control the movement of the valve core through electromagnetic force to open or close the fluid passage.

[0003] In existing technologies, the structure of a solenoid valve typically includes key components such as a stationary iron core, a moving iron core, a piston seat, and a valve seat. To ensure the stability of the valve core's movement and its sealing performance, a piston seat is integrally installed below the stationary iron core. The piston seat and the valve seat are assembled through threaded connections, welding, or other fixing methods. The piston head is movably installed within the piston seat and performs sealing or opening actions corresponding to the valve port position of the valve seat.

[0004] However, since the piston seat and the stationary iron core are made in one piece, the precision and performance requirements of the processing equipment are high, which directly leads to an increase in manufacturing costs. In addition, the connection between the piston seat and the valve seat requires multiple assembly processes, which prolongs the overall assembly cycle of the solenoid valve and seriously affects production efficiency. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a piston-seat-less snap-fit ​​solenoid valve, which effectively solves the problems in the background technology.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a piston-seat-less snap-fit ​​solenoid valve, comprising: a valve seat, a valve core assembly, and a snap-fit ​​assembly disposed at the connection between the valve seat and the valve core assembly; The valve core assembly includes a stationary iron core and a moving iron core arranged coaxially, and a drive assembly for driving the moving iron core to open or close the valve port. The valve seat is provided with a mounting groove for the snap-fit ​​assembly to be inserted, and an annular groove is provided on the side wall of the mounting groove; The snap-fit ​​assembly includes a connecting disc and a snap ring. The center hole of the connecting disc is interference-fitted with the stationary iron core. The snap ring is installed in the annular groove, and its outer side wall is tightly abutted against the side wall of the annular groove. The inner diameter of the snap ring is smaller than the outer diameter of the connecting disc.

[0007] Furthermore, a sealing structure is provided on the contact surface between the mounting groove and the connecting plate.

[0008] Furthermore, the valve core assembly also includes a valve needle, a piston head, a first elastic element, and a limiting element; The piston head is located at the valve port of the valve seat, the valve needle and the first elastic element are placed in the center hole of the moving iron core, and the limiting element is fixedly located at the end of the moving iron core away from the stationary iron core. The valve needle is axially floating and disposed in the center hole of the moving iron core via the first elastic element, and the end of the valve needle passes through the stationary iron core and abuts against the piston head.

[0009] Furthermore, the piston head includes a sliding sleeve and a sealing head disposed on the end face of the sliding sleeve facing the valve port.

[0010] Furthermore, a shock-absorbing pad is provided at the end of the moving iron core away from the stationary iron core.

[0011] Furthermore, the inner edge of the connecting disc extends axially toward the moving iron core to form a sleeve, and the outer cylindrical surface of the end of the stationary iron core is provided with a stepped groove for the sleeve to be inserted. Furthermore, the sleeve and the stepped groove are interference-fitted.

[0012] Furthermore, the axial length of the sleeve is less than the depth of the mounting groove.

[0013] Furthermore, the drive assembly includes an electromagnetic coil sleeved on the outside of the valve core assembly and a return spring disposed between the stationary iron core and the moving iron core.

[0014] Furthermore, a magnetic shielding sleeve is fitted onto the outer cylindrical surface of the stationary iron core near the end of the moving iron core.

[0015] Furthermore, the moving iron core has a conical protrusion at one end near the stationary iron core, while the stationary iron core has a conical groove for the protrusion to be inserted.

[0016] The beneficial effects of this utility model are as follows: by using the interference fit between the connecting plate and the stationary iron core, this utility model eliminates the piston seat, reduces the processing difficulty and equipment requirements, and further saves processing costs; and the snap-fit ​​structure between the snap ring and the connecting plate simplifies the assembly process of the valve seat and valve core assembly, shortens the assembly cycle, and improves production efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic cross-sectional view of the overall structure of the piston-seat-less snap-fit ​​solenoid valve in this embodiment of the present invention; Figure 2 This is a schematic diagram of the installation of the snap-fit ​​component in an embodiment of this utility model; Figure 3 This is a partial cross-sectional schematic diagram of the piston-seat-less snap-fit ​​solenoid valve in this embodiment of the present invention; Figure 4 for Figure 3A magnified view of part A.

[0018] Reference numerals: 1. Valve seat; 11. Mounting groove; 12. Annular groove; 2. Valve core assembly; 21. Stationary iron core; 22. Moving iron core; 23. Drive assembly; 231. Electromagnetic coil; 232. Return spring; 24. Valve needle; 25. Piston head; 251. Sliding sleeve; 252. Sealing head; 26. First elastic element; 27. Shock-absorbing pad; 28. Magnetic shielding sleeve; 29. ​​Limiting element; 3. Snap-fit ​​assembly; 31. Connecting disc; 31a. Sleeve; 32. Snap ring; 4. Sealing structure. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] like Figures 1 to 4 The pistonless snap-fit ​​solenoid valve shown includes: a valve seat 1, a valve core assembly 2, and a snap-fit ​​assembly 3 disposed at the connection between the valve seat 1 and the valve core assembly 2; The valve core assembly 2 includes a stationary iron core 21 and a moving iron core 22 arranged coaxially, and a drive assembly 23 for driving the moving iron core 22 to open or close the valve port; The valve seat 1 is provided with a mounting groove 11 for the snap-fit ​​assembly 3 to be embedded, and an annular groove 12 is provided on the side wall of the mounting groove 11; The snap-fit ​​assembly 3 includes a connecting disc 31 and a retaining ring 32. The center hole of the connecting disc 31 is interference-fitted with the stationary iron core 21 to ensure a secure connection. The retaining ring 32 is installed in the annular groove 12, with its outer side wall tightly abutting against the side wall of the annular groove 12, providing stable radial support. The inner diameter of the retaining ring 32 is smaller than the outer diameter of the connecting disc 31. This ensures that the connecting disc 31 is reliably limited by the retaining ring 32, preventing axial movement.

[0021] By using the interference fit between the connecting disc 31 and the stationary iron core 21, the piston seat is eliminated, reducing the processing difficulty and equipment requirements, and further saving processing costs; in addition, the snap-fit ​​structure between the snap ring 32 and the connecting disc 31 simplifies the assembly process of the valve seat 1 and the valve core assembly 2, shortens the assembly cycle, and improves production efficiency.

[0022] In the preferred structure of this scheme, a sealing structure 4 is provided on the contact surface between the mounting groove 11 and the connecting plate 31. The end face sealing structure 4 can effectively prevent fluid leakage from the gap between the two, ensuring the accuracy and reliability of fluid control during the operation of the solenoid valve.

[0023] In a preferred embodiment, the valve core assembly 2 further includes a valve needle 24, a piston head 25, a first elastic element 26, and a limiting element 29; the piston head 25 is disposed at the valve port position of the valve seat 1, the valve needle 24 and the first elastic element 26 are disposed in the central hole of the moving iron core 22, and the limiting element 29 is fixedly disposed at the end of the moving iron core 22 away from the stationary iron core 21; the valve needle 24 is axially floating in the central hole of the moving iron core 22 through the first elastic element 26, and the end of the valve needle 24 penetrates the stationary iron core 21 and abuts against the piston head 25.

[0024] The valve needle 24, the first elastic element 26, and the limiting element 29 are sequentially arranged axially within the central hole of the moving iron core 22. The boss of the limiting element 29 is embedded in the central hole and is press-fitted with it. The fit between the limiting element 29 and the valve needle 24 provides axial compression to the first elastic element 26. The valve needle 24 can float axially through the first elastic element 26. When the moving iron core 22 drives the valve needle 24 to move, the elastic element can buffer the impact force of the moving iron core 22 on the valve needle 24, reducing component wear and extending service life. At the same time, the floating arrangement allows the valve needle 24 to better fit with the piston head 25. Even with minor assembly errors or component wear, the sealing effect of the piston head 25 on the valve port can be guaranteed by the compensation effect of the elastic element, improving sealing reliability.

[0025] As a preferred embodiment of the above scheme, the piston head 25 includes a sliding sleeve 251 and a sealing head 252 disposed on the end face of the sliding sleeve 251 facing the valve port.

[0026] The piston head 25 adopts a split structure, which can be manufactured using different materials according to usage requirements, reducing the overall processing difficulty. Furthermore, when one part needs to be replaced, there is no need to replace the entire piston head 25, thus reducing maintenance costs.

[0027] In a preferred embodiment of this invention, a shock-absorbing pad 27 is provided at the end of the moving iron core 22 away from the stationary iron core 21. This pad absorbs the impact force and vibration generated during the resetting process of the moving iron core 22, reduces collision noise between the moving iron core 22 and other components, and reduces the impact of vibration on the overall structure of the solenoid valve, thus helping to maintain the stability of the solenoid valve's operation and extend its service life.

[0028] In a preferred embodiment of this utility model, the inner edge of the connecting disc 31 extends axially toward the moving iron core 22 to form a sleeve 31a. A stepped groove is provided on the outer cylindrical surface of the end of the stationary iron core 21 for the sleeve 31a to be inserted into; and the sleeve 31a and the stepped groove are interference-fitted. The sleeve 31a increases the contact area and fitting length between the connecting disc 31 and the stationary iron core 21, making the connection more robust and reliable. It effectively resists the axial and radial forces generated during the operation of the solenoid valve, preventing loosening of the connection and further ensuring the stability of the overall structure.

[0029] Based on the above scheme, the axial length of the sleeve 31a is less than the depth of the mounting groove 11 to avoid interference between the sleeve 31a and the installation of the electromagnetic coil 231.

[0030] In a preferred embodiment of this utility model, the drive assembly 23 includes an electromagnetic coil 231 sleeved on the outside of the valve core assembly 2 and a reset spring 232 disposed between the stationary iron core 21 and the moving iron core 22.

[0031] The electromagnetic coil 231 generates magnetic force through the stationary iron core 21 to control the moving iron core 22 to close the valve port. The return spring 232 drives the moving iron core 22 to return to its original position after the moving iron core 22 loses its magnetic attraction, thereby opening the valve port. The two work together to make the opening and closing action of the solenoid valve respond quickly and stably, ensuring that the control commands can be accurately executed under different working conditions, thus improving the reliability of operation.

[0032] In this design, a magnetic shielding sleeve 28 is fitted onto the outer cylindrical surface of the stationary iron core 21 near the moving iron core 22. This effectively reduces magnetic leakage between the stationary iron core 21 and other components, allowing the magnetic force generated by the electromagnetic coil 231 to act more on the moving iron core 22, enhancing the attraction to the moving iron core 22, improving the response speed and driving force of the solenoid valve, and ensuring that the moving iron core 22 can quickly and reliably complete the valve port closing action.

[0033] In a preferred embodiment of this invention, the moving iron core 22 has a conical protrusion at one end near the stationary iron core 21, while the stationary iron core 21 has a conical groove for the protrusion to be inserted. When the moving iron core 22 moves toward the stationary iron core 21 under the action of electromagnetic force, the guiding effect of the conical surface can automatically correct any slight radial offset that may exist in the moving iron core 22, ensuring that the two are coaxially aligned. This avoids local wear or jamming caused by eccentricity when the moving iron core 22 and the stationary iron core 21 are attracted together, and ensures the long-term stability of the solenoid valve.

[0034] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A piston seatless cartridge solenoid valve, characterized by, It includes a valve seat (1), a valve core assembly (2), and a snap-fit ​​assembly (3) disposed at the connection between the valve seat (1) and the valve core assembly (2); The valve core assembly (2) includes a stationary iron core (21) and a moving iron core (22) arranged coaxially, and a drive assembly (23) for driving the moving iron core (22) to open or close the valve port; The valve seat (1) is provided with a mounting groove (11) for the snap-fit ​​assembly (3) to be inserted, and an annular groove (12) is provided on the side wall of the mounting groove (11); The snap-fit ​​assembly (3) includes a connecting disc (31) and a snap ring (32). The center hole of the connecting disc (31) is interference-fitted with the stationary iron core (21). The snap ring (32) is installed in the annular groove (12), and its outer side wall is tightly abutted against the side wall of the annular groove (12). The inner diameter of the snap ring (32) is smaller than the outer diameter of the connecting disc (31).

2. The piston-less seat spool solenoid valve according to claim 1, wherein A sealing structure (4) is provided on the contact surface between the mounting groove (11) and the connecting plate (31).

3. The piston-less seat spool solenoid valve according to claim 1, wherein The valve core assembly (2) also includes a valve needle (24), a piston head (25), a first elastic element (26), and a limiting element (29); The piston head (25) is located at the valve port of the valve seat (1), the valve needle (24) and the first elastic element (26) are placed in the center hole of the moving iron core (22), and the limiting element (29) is fixedly located at one end of the moving iron core (22) away from the stationary iron core (21). The valve needle (24) is axially floating in the center hole of the moving iron core (22) via the first elastic element (26), and the end of the valve needle (24) passes through the stationary iron core (21) and abuts against the piston head (25).

4. The piston-less seat spool solenoid valve according to claim 3, wherein The piston head (25) includes a sliding sleeve (251) and a plug head (252) disposed on the end face of the sliding sleeve (251) facing the valve port.

5. The piston-less seat spool solenoid valve according to claim 1, wherein The moving iron core (22) is provided with a shock-absorbing pad (27) at the end away from the stationary iron core (21).

6. The piston-less seat spool solenoid valve according to claim 1, wherein The inner hole edge of the connecting disc (31) extends axially toward the moving iron core (22) to form a sleeve (31a), and the outer cylindrical surface of the end of the stationary iron core (21) is provided with a stepped groove for the sleeve (31a) to be inserted. Furthermore, the sleeve (31a) and the stepped groove are interference fit.

7. The piston-less seat spool solenoid valve according to claim 6, wherein The length of the sleeve (31a) along the axial direction is less than the depth of the mounting groove (11).

8. The piston-less seat spool solenoid valve according to claim 1, wherein The drive assembly (23) includes an electromagnetic coil (231) sleeved on the outside of the valve core assembly (2) and a return spring (232) disposed between the stationary iron core (21) and the moving iron core (22).

9. The piston-less seat spool solenoid valve according to claim 1, wherein A magnetic shielding sleeve (28) is fitted on the outer cylindrical surface of the stationary iron core (21) near the moving iron core (22).

10. The pistonless snap-fit ​​solenoid valve according to claim 1, characterized in that, The moving iron core (22) has a conical protrusion at one end near the stationary iron core (21), while the stationary iron core (21) has a conical groove for the protrusion to be inserted.

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