Friction-free direct-acting diaphragm electromagnetic valve

Abstract

The utility model discloses a friction-free direct-acting type diaphragm electromagnetic valve which comprises a valve body and an electromagnet assembly, and an inlet flow channel and an outlet flow channel are arranged on the valve body. The electromagnet assembly comprises a shell, a coil frame arranged in the shell, a coil arranged on the coil frame, a static iron core fixedly arranged in the center of the coil frame, a movable iron core movably arranged in the center of the coil frame, a diaphragm valve head arranged on the movable iron core and a pre-tightening spring acting on the movable iron core. A shaft hole is formed in the center of the static iron core, the outer edges of the first supporting spring and the second supporting spring are connected into the shell, the center of the first supporting spring is connected to the upper end of the center shaft in a matched mode, and the center of the second supporting spring is connected to the lower end of the movable iron core in a matched mode. Through the design of the supporting spring, it is ensured that no friction force is generated in the working process of the direct-drive electromagnetic valve, and meanwhile pollution is prevented through the diaphragm valve head blocking flow channel and the electromagnetic assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a frictionless direct-acting diaphragm solenoid valve. Background Art

[0002] Solenoid valves, as common fluid control components, are widely used in industrial automation, automotive braking systems, aerospace, and other fields. With technological advancements, frictionless and clean solenoid valves are becoming key market demands. Direct-drive solenoid valves require fast response to ensure system accuracy, but traditional direct-drive solenoid valves often suffer from high friction, leading to response lag and reduced accuracy. Furthermore, friction can increase valve core wear, impacting service life and reliability. A frictionless design can effectively reduce energy loss and improve overall efficiency.

[0003] With increasing environmental protection and safety requirements, the cleanliness performance of solenoid valves has become increasingly important. Especially in fields with extremely high requirements for environmental cleanliness, such as semiconductor manufacturing, medical devices, and food processing, the use of clean solenoid valves can effectively prevent particulate matter and contaminants from entering the working medium, ensuring system cleanliness and stability.

[0004] Existing direct-drive solenoid valves struggle to meet the combined requirements of frictionlessness and cleanliness. Therefore, designing a frictionless and clean solenoid valve is an important direction for current technological development, as it can both improve equipment efficiency and extend its service life. Utility Model Content

[0005] The purpose of this utility model is to provide a frictionless direct-acting diaphragm solenoid valve. The utility model realizes radial support by means of double support springs, avoids the generation of friction, ensures the stability of the moving iron core during movement, realizes the clean performance of the solenoid valve by means of a diaphragm valve head, and meets the increasing market demand.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a frictionless direct-acting diaphragm solenoid valve, comprising a valve body and an electromagnet assembly, the valve body being provided with an inlet flow channel and an outlet flow channel, and a flow port being provided between the inlet flow channel and the outlet flow channel; the electromagnet assembly comprising an outer shell, a coil frame arranged in the outer shell, a coil arranged on the coil frame, a static iron core fixedly arranged at the center of the coil frame, a moving iron core movably arranged at the center of the coil frame, a diaphragm valve head arranged on the moving iron core for controlling the on and off of the flow port, and a pre-tightening spring acting on the moving iron core to urge the diaphragm valve head to move toward the flow port; it also comprises a central axis, a first support spring and a second support spring, an axial hole for the central axis to pass through is opened axially at the center of the static iron core, the inner diameter of the axial hole is larger than the outer diameter of the central axis, the outer edges of the first support spring and the second support spring are both connected to the inner shell, and the center of the first support spring is matched to be connected to the upper end of the central axis, and the center of the second support spring is matched to be connected to the lower end of the moving iron core.

[0007] The present invention is further configured such that the first support spring and the second support spring are both circular sheet structures, and a first through hole for the central axis to pass through is provided at the center of the first support spring, and a second through hole for the moving iron core to pass through is provided at the center of the second support spring, a first limiting flange for fitting with the bottom surface of the first support spring is provided on the central axis, and a second limiting flange for fitting with the bottom surface of the second support spring is provided at the bottom of the moving iron core, and when the diaphragm valve head is in contact with the flow port, the first support spring and the second support spring are in a free state.

[0008] The present invention is further configured as follows: the outer shell includes a shell body and a top cover; the top cover, shell body and valve body are connected together from top to bottom by fasteners; a sealing ring is sandwiched between the shell body and the valve body; the bottom of the shell body is provided with a support flange extending inward; the bottom end of the coil frame is tightly abutted against the top end of the support flange; a cover plate is sandwiched between the top end of the coil frame and the bottom end of the top cover; the outer edge of the first support spring is sandwiched between the top cover and the shell body; the outer edge of the second support spring is sandwiched between the shell body and the valve body.

[0009] The utility model is further configured as follows: a first step groove is provided on the cover plate, a second step groove corresponding to the first step groove is provided on the top cover, and the outer edge of the first support spring is embedded between the first step groove and the second step groove; a third step groove is provided at the bottom end of the shell body, and the outer edge of the second support spring is embedded in the third step groove.

[0010] The present invention is further configured such that the lower end of the top cover is provided with a first clearance recess for the first support spring to extend into when deformed, and the lower end of the support flange of the shell body is provided with a second clearance recess for the second support spring to extend into when deformed.

[0011] The present invention is further configured such that a plurality of curved holes are distributed in a circumferential array on the second support spring, and a plurality of curved platforms that match the curved holes are provided on the diaphragm valve head.

[0012] The utility model is further configured such that a plurality of annular grooves are concentrically provided on the upper end of the valve body, and a plurality of annular protrusions that fit with the annular grooves are provided on the lower end of the diaphragm valve head.

[0013] The utility model is further configured such that the lower end of the moving iron core is provided with a connecting protrusion with an inverted T-shaped cross section, and the diaphragm valve head is provided with a connecting groove with an inverted T-shaped cross section for fitting with the connecting protrusion.

[0014] The present invention is further configured such that the central shaft and the moving iron core are connected together via a latch.

[0015] The utility model is further configured such that a spring groove is provided at the lower end of the static iron core, the pre-tightening spring is arranged in the spring groove, and the upper end of the pre-tightening spring is tightly pressed against the inner end of the spring groove, and the lower end of the pre-tightening spring is tightly pressed against the upper end of the moving iron core.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The utility model provides a frictionless direct-acting diaphragm solenoid valve, in which a double support spring replaces the traditional spring design, ensuring the stability of the movement of the moving iron core while providing the reset elastic force, so that the moving iron core can avoid friction caused by deflection and offset during movement, and the diaphragm valve head blocks the flow channel and the electromagnetic component to prevent contamination. The diaphragm valve head is combined with the moving iron core and the second support spring, so that the diaphragm valve head and the second support spring cooperate and counteract each other, preventing the diaphragm valve head from being deformed during long-term use and causing leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram of the entire utility model;

[0019] Figure 2 A cross-sectional view of the utility model as a whole;

[0020] Figure 3 An exploded view of the entire utility model;

[0021] Figure 4 A cross-sectional view showing the assembly of the central axis portion of the present invention;

[0022] Figure 5 This is a cross-sectional view of the assembly of the diaphragm valve head portion of the utility model.

[0023] In the figure: 1. Valve body; 2. Electromagnet assembly; 3. Inlet flow channel; 4. Outlet flow channel; 5. Flow port; 6. Housing; 7. Coil frame; 8. Coil; 9. Static iron core; 10. Moving iron core; 11. Diaphragm valve head; 12. Preload spring; 13. Center shaft; 14. First support spring; 15. Second support spring; 16. Shaft hole; 17. First through hole; 18. Second through hole; 19. First limit flange; 20. Second limiting flange; 21. Shell; 22. Top cover; 23. Sealing ring; 24. Support flange; 25. Cover plate; 26. First step groove; 27. Second step groove; 28. Third step groove; 29. First clearance recess; 30. Second clearance recess; 31. Bend hole; 32. Bend platform; 33. Annular groove; 34. Annular protrusion; 35. Connecting protrusion; 36. Connecting groove; 37. Latch; 38. Spring groove. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Example: As shown in the attached Figures 1 to 5 The frictionless direct-acting diaphragm solenoid valve shown in the figure includes a valve body 1 and an electromagnet assembly 2, wherein the valve body 1 is provided with an inlet flow channel 3 and an outlet flow channel 4, and a flow port 5 is provided between the inlet flow channel 3 and the outlet flow channel 4; the electromagnet assembly 2 includes a housing 6, a coil frame 7 arranged in the housing 6, a coil 8 arranged on the coil frame 7, a static iron core 9 fixedly arranged at the center of the coil frame 7, a moving iron core 10 movably arranged at the center of the coil frame 7, a diaphragm valve head 11 arranged on the moving iron core 10 for controlling the on-off of the flow port 5, and a diaphragm valve head 11 that acts on the moving iron core 10 to move the diaphragm valve head 11 toward the flow port 5. The solenoid valve also includes a central axis 13, a first support spring 14, and a second support spring 15. The center of the static iron core 9 is axially provided with an axial hole 16 for the central axis 13 to pass through. The inner diameter of the axial hole 16 is larger than the outer diameter of the central axis 13. The central axis 13 passes through the axial hole 16 without contacting the inner wall of the axial hole 16. The outer edges of the first support spring 14 and the second support spring 15 are both connected to the housing 6, and the center of the first support spring 14 is connected to the upper end of the central axis 13, and the center of the second support spring 15 is connected to the lower end of the moving iron core 10. The design of the double support springs replacing the traditional springs ensures the stability of the movement of the moving iron core 10 while providing the reset elastic force, so that the moving iron core 10 avoids friction caused by deflection and offset during movement.

[0026] As attached Figure 2 As shown, the first support spring 14 and the second support spring 15 are both circular sheet structures, and a first through hole 17 for the central axis 13 to pass through is provided at the center of the first support spring 14, and a second through hole 18 for the moving iron core 10 to pass through is provided at the center of the second support spring 15. A first limiting flange 19 for fitting with the bottom surface of the first support spring 14 is provided on the central axis 13, and a second limiting flange 20 for fitting with the bottom surface of the second support spring 15 is provided at the bottom of the moving iron core 10. When the diaphragm valve head 11 abuts against the flow port 5, the first support spring 14 and the second support spring 15 are in a free state.

[0027] As attached Figure 2 As shown, the housing 6 includes a body 21 and a top cover 22. The top cover 22, body 21, and valve body 1 are connected together from top to bottom by fasteners. A sealing ring 23 is sandwiched between the body 21 and the valve body 1. The bottom of the body 21 is provided with an inwardly extending support flange 24. The bottom end of the coil bobbin 7 is tightly abutted against the top end of the support flange 24. A cover plate 25 is sandwiched between the top end of the coil bobbin 7 and the bottom end of the top cover 22. The outer edge of the first support spring 14 is sandwiched between the top cover 22 and the body 21, and the outer edge of the second support spring 15 is sandwiched between the body 21 and the valve body 1. The detachable design of the housing 6 facilitates the disassembly and assembly of various components.

[0028] As attached Figure 2 As shown, the cover plate 25 is provided with a first stepped groove 26, and the top cover 22 is provided with a second stepped groove 27 corresponding to the first stepped groove 26. The outer edge of the first support spring 14 is embedded between the first stepped groove 26 and the second stepped groove 27. The bottom end of the housing 21 is provided with a third stepped groove 28, and the outer edge of the second support spring 15 is embedded in the third stepped groove 28. The first support spring 14 and the second support spring 15 are positioned and installed to ensure the stability of the installation structure.

[0029] As attached Figure 2 As shown, the lower end of the top cover 22 is provided with a first clearance recess 29 for the first support spring 14 to extend into when it is deformed, and the lower end of the support flange 24 of the shell body 21 is provided with a second clearance recess 30 for the second support spring 15 to extend into when it is deformed. This design provides clearance space for the first support spring 14 and the second support spring 15, so that the deformation of the first support spring 14 and the second support spring 15 is not hindered.

[0030] As attached Figure 2 and attached Figure 5As shown, the second support spring 15 is provided with a plurality of curved holes 31 distributed in a circumferential array, and the diaphragm valve head 11 is provided with a plurality of curved platforms 32 that fit with the curved holes 31. The second support spring 15 and the diaphragm valve head 11 are connected together so that the diaphragm valve head 11 and the second support spring 15 cooperate and counteract each other, thereby preventing the diaphragm valve head 11 from deforming during long-term use and causing leakage.

[0031] As attached Figure 2 As shown, the upper end of the valve body 1 is concentrically provided with multiple annular grooves 33, and the lower end of the diaphragm valve head 11 is provided with multiple annular protrusions 34 that fit with the annular grooves 33 to position and install the diaphragm valve head 11 and improve the stability of the installation of the edge of the diaphragm valve head 11.

[0032] As attached Figure 5 As shown, the lower end of the moving iron core 10 is provided with a connecting protrusion 35 with an inverted T-shaped cross section, and the diaphragm valve head 11 is provided with a connecting groove 36 with an inverted T-shaped cross section for matching with the connecting protrusion 35. The connection structure between the two is simple and reliable, and disassembly and assembly are very convenient.

[0033] As attached Figure 4 As shown, the central shaft 13 and the moving iron core 10 are connected together through a pin 37, which can realize a linkage connection between the two, and the connection structure is very firm.

[0034] As attached Figure 4 As shown, a spring slot 38 is provided at the lower end of the static iron core 9, and the preload spring 12 is arranged in the spring slot 38, and the upper end of the preload spring 12 is pressed against the inner end of the spring slot 38, and the lower end of the preload spring 12 is pressed against the upper end of the moving iron core 10.

[0035] The working principle of the present utility model is as follows: when the coil 8 is energized, the coil 8 generates a closed-loop magnetic flux, the static iron core 9 is magnetized by the coil 8 and generates magnetism, the movable iron core 10 overcomes the elastic force of the preload spring 12, the first support spring 14, and the second support spring 15 and moves smoothly toward the static iron core 9. The diaphragm valve head 11 moves along with the movable iron core 10, and the fluid enters the outlet flow channel 4 from the inlet flow channel 3. When the coil 8 is de-energized, the static iron core 9 is demagnetized, and the movable iron core 10 and the diaphragm valve head 11 are reset under the combined action of the preload spring 12, the first support spring 14, and the second support spring 15, blocking the inlet flow channel 3. The preload force provided by the preload spring 12 provides a better sealing effect, and no friction is generated during the movement due to the action of the first support spring 14 and the second support spring 15.

Claims

1. A frictionless direct-acting diaphragm solenoid valve, comprising a valve body (1) and an electromagnet assembly (2), wherein the valve body (1) is provided with an inlet flow channel (3) and an outlet flow channel (4), and a flow port (5) is provided between the inlet flow channel (3) and the outlet flow channel (4); the electromagnet assembly (2) comprises a housing (6), a coil frame (7) disposed in the housing (6), a coil (8) disposed on the coil frame (7), a static iron core (9) fixedly disposed at the center of the coil frame (7), a movable iron core (10) movably disposed at the center of the coil frame (7), a diaphragm valve head (11) disposed on the movable iron core (10) for controlling the on / off of the flow port (5), and a preload spring (12) acting on the movable iron core (10) to urge the diaphragm valve head (11) to move toward the flow port (5); and characterized in that: It also includes a central axis (13), a first support spring (14) and a second support spring (15); an axial hole (16) for the central axis (13) to pass through is opened axially at the center of the static iron core (9); the inner diameter of the axial hole (16) is larger than the outer diameter of the central axis (13); the outer edges of the first support spring (14) and the second support spring (15) are both connected to the housing (6), and the center of the first support spring (14) is matched to be connected to the upper end of the central axis (13), and the center of the second support spring (15) is matched to be connected to the lower end of the moving iron core (10).

2. The frictionless direct-acting diaphragm solenoid valve according to claim 1, characterized in that: The first support spring (14) and the second support spring (15) are both circular sheet structures, and a first through hole (17) for the central axis (13) to pass through is provided at the center of the first support spring (14), and a second through hole (18) for the moving iron core (10) to pass through is provided at the center of the second support spring (15). A first limiting flange (19) for fitting with the bottom surface of the first support spring (14) is provided on the central axis (13), and a second limiting flange (20) for fitting with the bottom surface of the second support spring (15) is provided at the bottom of the moving iron core (10). When the diaphragm valve head (11) abuts against the flow port (5), the first support spring (14) and the second support spring (15) are in a free state.

3. The frictionless direct-acting diaphragm solenoid valve according to claim 2, characterized in that: The housing (6) comprises a shell body (21) and a top cover (22); the top cover (22), the shell body (21) and the valve body (1) are connected together from top to bottom by fasteners; a sealing ring (23) is sandwiched between the shell body (21) and the valve body (1); a supporting flange (24) extending inward is provided at the bottom of the shell body (21); the bottom end of the coil frame (7) is tightly abutted against the top end of the supporting flange (24); a cover plate (25) is sandwiched between the top end of the coil frame (7) and the bottom end of the top cover (22); the outer edge of the first support spring (14) is sandwiched between the top cover (22) and the shell body (21); and the outer edge of the second support spring (15) is sandwiched between the shell body (21) and the valve body (1).

4. The frictionless direct-acting diaphragm solenoid valve according to claim 3, characterized in that: The cover plate (25) is provided with a first stepped groove (26), the top cover (22) is provided with a second stepped groove (27) corresponding to the first stepped groove (26), and the outer edge of the first support spring (14) is embedded between the first stepped groove (26) and the second stepped groove (27); the bottom end of the shell body (21) is provided with a third stepped groove (28), and the outer edge of the second support spring (15) is embedded in the third stepped groove (28).

5. The frictionless direct-acting diaphragm solenoid valve according to claim 4, characterized in that: The lower end of the top cover (22) is provided with a first recessed portion (29) for the first support spring (14) to extend into when deformed, and the lower end of the support flange (24) of the shell body (21) is provided with a second recessed portion (30) for the second support spring (15) to extend into when deformed.

6. The frictionless direct-acting diaphragm solenoid valve according to claim 1, characterized in that: The second support spring (15) is provided with a plurality of curved holes (31) distributed in a circumferential array, and the diaphragm valve head (11) is provided with a plurality of curved platforms (32) that align with the curved holes (31).

7. The frictionless direct-acting diaphragm solenoid valve according to claim 1, characterized in that: The upper end of the valve body (1) is concentrically provided with a plurality of annular grooves (33), and the lower end of the diaphragm valve head (11) is provided with a plurality of annular protrusions (34) that fit with the annular grooves (33).

8. The frictionless direct-acting diaphragm solenoid valve according to claim 1, characterized in that: The lower end of the moving iron core (10) is provided with a connecting protrusion (35) with an inverted T-shaped cross section, and the diaphragm valve head (11) is provided with a connecting groove (36) with an inverted T-shaped cross section for fitting with the connecting protrusion (35).

9. The frictionless direct-acting diaphragm solenoid valve according to claim 1, characterized in that: The central shaft (13) and the moving iron core (10) are connected together via a latch (37).

10. The frictionless direct-acting diaphragm solenoid valve according to claim 1, characterized in that: The lower end of the static iron core (9) is provided with a spring groove (38), the preload spring (12) is arranged in the spring groove (38), and the upper end of the preload spring (12) is tightly pressed against the inner end of the spring groove (38), and the lower end of the preload spring (12) is tightly pressed against the upper end of the moving iron core (10).

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