Miniature proportional solenoid valve without magnetic shield ring

Abstract

The present application relates to flow control valve technical field, belong to a kind of no magnetic ring miniature proportional solenoid valve, including valve body, fixedly arranged in the valve body valve seat, with the detachable connection of the valve body stop iron, and the armature slidably arranged in the stop iron, the second blind hole is opened in the stop iron, flexible component is equipped between the armature and second blind hole, can reduce friction, reduce noise, prolong product life, ensure working air gap, prevent the effect of residual magnetism sticking, improve product current flow curve resolution;The end of the armature close to the valve seat is equipped with composite rubber pad for cooperating with valve seat sealing, and armature cap is located at the same end, and sheet spring is equipped between the armature cap and stop iron end face for providing reset force;Compared with existing electromagnetic structure, greater electromagnetic force can be provided under the same size specification, higher durability life, faster response speed and lower processing difficulty.

Description

Technical Field

[0001] This invention relates to the field of flow control valve technology, specifically a miniature proportional solenoid valve without a magnetic isolation ring. Background Technology

[0002] Miniature proportional solenoid valves are commonly used in the medical field and in smart devices. In the medical field, they are mainly used to precisely control the mixing ratio of different gases to ensure oxygen concentration or anesthetic dosage. In smart devices, they can be used to control water pressure and flow rate in fully automatic coffee machines.

[0003] Most existing domestic and foreign solenoid valve products of the same type use platform or basin-type solenoid structures. Because these solenoid structures use the structure mode of magnetic circuit breakers, the external mating parts of the moving iron (moving parts) are usually processed into independent parts similar to bearings, and air is used in the middle to act as a magnetic circuit breaker, so that the magnetic field can pass through the moving iron (moving parts) to the maximum extent and obtain a larger electromagnetic force.

[0004] However, this design places high demands on product assembly and is prone to solenoid valve jamming. During the movement of the solenoid valve's moving iron, it is subjected to lateral attraction from the stationary iron. If the coaxiality of the external mating parts of the moving iron is poor, it can easily wobble and jam, causing the product to malfunction. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a miniature proportional solenoid valve without a magnetic isolation ring. Compared with existing electromagnetic structures, it can provide greater electromagnetic force, longer service life, faster response speed, and lower processing difficulty for the same size specifications.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a miniature proportional solenoid valve without a magnetic isolation ring, comprising a valve body, a valve seat fixedly disposed within the valve body, a stop iron detachably connected to the valve body, and an armature slidably disposed within the stop iron. The stop iron has a second blind hole, and a flexible component is provided between the armature and the second blind hole. The end of the armature near the valve seat has a composite rubber gasket for sealing with the valve seat, and an armature cap is provided at the same end. A leaf spring for providing a restoring force is provided between the armature cap and the end face of the stop iron.

[0007] Preferably, the valve seat is provided with a first through hole and a sealing cone surface, both of which are close to the composite rubber pad. The first through hole is a medium flow channel, and its size is adjusted to set the slope of the flow-current curve.

[0008] Preferably, the stop has a groove on its outer side and a second step inside the stop. The leaf spring is installed in the second step. The valve body has a first blind hole and a first step. The valve seat is connected to the valve body by an interference fit through the first step. A sealing ring is installed at the first step.

[0009] Preferably, the stop is connected to the valve body by a thread, and the sealing ring on the end face is squeezed by the thread to form a seal.

[0010] Preferably, the flexible component includes a gasket and a film disposed between the stop and the armature, the gasket being located between the opposite end faces of the stop and the armature, and the film being located between the stop and the sidewall of the armature.

[0011] Preferably, the armature has a stepped hole formed by a second through hole, a third blind hole and a fourth blind hole in sequence. The second through hole and the third blind hole are used to balance the pressure. A first pressure-inducing hole is opened on the wall of the fourth blind hole. A spring is installed in the third blind hole. The composite rubber pad is fitted into the fourth blind hole with a gap. The free end of the spring is connected to the composite rubber pad.

[0012] Preferably, the solenoid valve further includes a yoke and a pole shoe. The yoke is sleeved on a stop iron. The yoke has a fifth blind hole and a sixth blind hole. A coil assembly is installed in the fifth blind hole, and the pole shoe is installed in the sixth blind hole. The stop iron, the yoke, and the pole shoe are connected to form a closed magnetic circuit. The end of the stop iron away from the valve seat extends out of the yoke and is connected to a fastener. A large gasket is provided between the fastener and the outer wall of the yoke.

[0013] Preferably, the valve body is provided with an air inlet and an air outlet, and the air inlet and air outlet are provided with a filter screen and a filter screen gasket for fixing the filter screen.

[0014] Preferably, the stop iron, armature iron, yoke iron, and pole shoe are made of magnetically conductive metal material, and their surfaces are all coated with a wear-resistant and corrosion-resistant coating.

[0015] Preferably, the valve body, valve seat, leaf spring, spring, large washer, fastener, armature cap, and gasket are all made of non-magnetic materials.

[0016] Compared with the prior art, the present invention provides a miniature proportional solenoid valve without a magnetic isolation ring, which has the following advantages: The present invention discloses a miniature proportional solenoid valve without a magnetic isolation ring, comprising a valve body, a valve seat fixedly disposed within the valve body, a stop iron detachably connected to the valve body, and an armature slidably disposed within the stop iron. A second blind hole is provided within the stop iron, and a flexible component is provided between the armature and the second blind hole. This flexible component reduces friction, noise, extends product life, ensures a working air gap, and prevents residual magnetism from adhering. The groove in the stop iron enhances the electromagnetic force of the solenoid valve, improving the resolution of the product's current-flow curve. A composite rubber gasket for sealing with the valve seat is provided at one end of the armature near the valve seat, and an armature cap is provided at the same end. A leaf spring for providing a reset force is provided between the armature cap and the end face of the stop iron. Compared with existing electromagnetic structures, this valve offers greater electromagnetic force, longer lifespan, faster response speed, and lower processing difficulty for the same size specifications. Furthermore, the medium channel of the present invention is formed by a first through hole opened in the air inlet, air outlet and valve seat. The slope of the set flow-current curve can be adjusted by changing the diameter of the first through hole, thereby improving the control accuracy at small openings, increasing the proportional solenoid valve adjustment ratio, and reducing the dependence on the controller and cost.

[0017] The features and advantages of the present invention will be described in detail through embodiments and in conjunction with the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an embodiment of a miniature proportional solenoid valve without a magnetic isolation ring according to the present invention; Figure 2 This is a schematic diagram of the valve body structure of the present invention; Figure 3 This is a schematic diagram of the valve seat structure of the present invention; Figure 4 This is a schematic diagram of the retaining structure of the present invention; Figure 5 This is a schematic diagram of the armature structure of the present invention; Figure 6 This is a schematic diagram of the yoke structure of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0020] See Figures 1-6A miniature proportional solenoid valve without a magnetic ring includes a valve body 1, a valve seat 2 fixedly disposed within the valve body 1, a stop 4 detachably connected to the valve body 1, and an armature 12 slidably disposed within the stop 4. The stop 4 has a second blind hole 25, and a flexible component is provided between the armature 12 and the second blind hole 25. The armature 12 has a composite rubber gasket 14 for sealing with the valve seat 2 at one end near the valve seat 2, and an armature cap 15 is provided at the same end. A leaf spring 16 for providing a restoring force is provided between the armature cap 15 and the end face of the stop 4.

[0021] In one embodiment, the valve seat 2 is provided with a first through hole 23 and a sealing cone surface 24. Both the first through hole 23 and the sealing cone surface 24 are close to the composite rubber pad 14. The first through hole 23 is a medium flow channel. The slope of the flow-current curve is set by adjusting its size. The sealing cone surface 24 and the composite rubber pad form a seal between the air inlet side and the air outlet side under the action of the elastic force of the spring 13 and the air pressure, preventing the medium from leaking from here.

[0022] In one possible implementation, the stop 4 is provided with a groove, which can reduce magnetic leakage and effectively improve the magnetic induction intensity of the moving iron area to obtain higher electromagnetic force. The stop 4 is also provided with a second step 26, and the leaf spring 16 is installed in the second step 26. The valve body 1 is provided with a first blind hole 21 and a first step 22. The valve seat 2 is connected to the valve body 1 by interference fit through the first step 22 to separate the high-pressure side and the low-pressure side. A sealing ring 3 is installed at the first step 22.

[0023] In one possible implementation, the stop 4 is connected to the valve body 1 by a thread, and the sealing ring 3 on the end face is squeezed by the thread to form a seal, preventing the working medium from leaking through the threaded connection.

[0024] In one possible implementation, the flexible component includes a gasket 10 and a film 11 disposed between the stop 4 and the armature 12. The gasket 10 is located between the opposite end faces of the stop 4 and the armature 12, and serves to reduce noise, extend product life, ensure working air gap, and prevent residual magnetism from sticking together. The film 11 is located between the sidewalls of the stop 4 and the armature 12, and serves to reduce friction, extend product life, and improve the resolution of the product current flow curve.

[0025] In one embodiment, the armature 12 has a stepped hole formed by a second through hole 27, a third blind hole 28, and a fourth blind hole 30 in sequence. The second through hole 27 and the third blind hole 28 are used to balance pressure. A first pressure-inducing hole 29 is opened on the wall of the fourth blind hole 30. A spring 13 is installed in the third blind hole 28. The composite rubber pad 14 is fitted into the fourth blind hole 30 with a gap, so that the composite rubber pad can slide when subjected to overpressure, thus extending the life of the sealing surface. The free end of the spring 13 is connected to the composite rubber pad 14, and the spring 13 provides sealing force for the sealing between the composite rubber pad 14 and the valve seat 2.

[0026] In one possible implementation, the solenoid valve further includes a yoke 6 and a pole shoe 5. The yoke 6 is fitted onto a stop 4. The yoke 6 has a fifth blind hole 31 and a sixth blind hole 32. A coil assembly 7 is installed in the fifth blind hole 31, and the pole shoe 5 is installed in the sixth blind hole 32. The stop 4, yoke 6, and pole shoe 5 are connected to form a closed magnetic circuit. The end of the stop 4 away from the valve seat 2 extends from the yoke 6 and is connected to a fastener 9. A large gasket 8 is provided between the fastener 9 and the outer wall of the yoke 6. Specifically, the fastener 9 is a threaded cap, and the end of the stop 4 is threaded, thus cooperating with the threaded cap and the large gasket 8 to fasten the pole shoe 5, yoke 6, and coil assembly 7.

[0027] In one embodiment, the valve body 1 is provided with an air inlet 19 and an air outlet 20. A filter screen 18 and a filter screen gasket 17 for fixing the filter screen 18 are disposed within the air inlet 19 and the air outlet 20. The air inlet 19 and the air outlet 20 are clearance-fitted with the filter screen 18 and interference-fitted with the filter screen gasket 17, allowing the filter screen 18 to effectively intercept excess material in the medium. In one possible implementation, the stop 4, armature 12, yoke 6, and pole shoe 5 are made of magnetically conductive metal material, and their surfaces are all coated with a wear-resistant and corrosion-resistant coating.

[0028] In one possible implementation, the valve body 1, valve seat 2, leaf spring 16, spring 13, large washer 8, fastener 9, armature cap 15, and washer 10 are all made of non-magnetic materials.

[0029] Working principle of the invention: When the coil assembly 7 is energized, the armature 12 will move towards the stop 4 under the action of electromagnetic force. At this time, the armature 12 overcomes the spring force of the leaf spring 16 and drives the composite rubber pad 14 to disengage from the valve seat 2. The first through hole 23 is opened as a medium flow channel, thereby connecting the air inlet 19 and the air outlet 20 to realize the medium exchange function. When the coil assembly 7 is de-energized, the armature 12 will be pushed by the spring force of the leaf spring 16 to move towards the valve seat 2, thus resetting the armature 12; the spring 13 will push the composite rubber pad 14 to re-contact with the valve seat 2, forming a seal, and the air inlet 19 will be disconnected from the air outlet 20, thus achieving the pressure holding function.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A miniature proportional solenoid valve without a magnetic isolation ring, characterized in that: It includes a valve body (1), a valve seat (2) fixedly disposed in the valve body (1), a stop iron (4) detachably connected to the valve body (1), and an armature (12) slidably disposed in the stop iron (4). A second blind hole (25) is provided in the stop iron (4), and a flexible component is provided between the armature (12) and the second blind hole (25). The armature (12) has a composite rubber pad (14) for sealing with the valve seat (2) at one end, and an armature cap (15) is provided at the same end. A leaf spring (16) for providing restoring force is provided between the armature cap (15) and the end face of the stop (4).

2. The miniature proportional solenoid valve without magnetic isolation ring according to claim 1, characterized in that: The valve seat (2) is provided with a first through hole (23) and a sealing cone surface (24). The first through hole (23) and the sealing cone surface (24) are both close to the composite rubber pad (14). The first through hole (23) is a medium flow channel. The slope of the flow rate-current curve is set by adjusting its size.

3. The miniature proportional solenoid valve without magnetic isolation ring according to claim 1, characterized in that: The stop (4) has a groove on its outside and a second step (26) inside the stop (4). The leaf spring (16) is installed in the second step (26). The valve body (1) has a first blind hole (21) and a first step (22). The valve seat (2) is connected to the valve body (1) by interference fit through the first step (22). A sealing ring (3) is installed at the first step (22).

4. The miniature proportional solenoid valve without magnetic isolation ring according to claim 3, characterized in that: The stop (4) is connected to the valve body (1) by a thread, and the sealing ring (3) on the end face is squeezed by the thread to form a seal.

5. A miniature proportional solenoid valve without magnetic isolation ring according to claim 1, characterized in that: The flexible component includes a gasket (10) and a film (11) disposed between the stop (4) and the armature (12). The gasket (10) is located between the opposite end faces of the stop (4) and the armature (12), and the film (11) is located between the sidewalls of the stop (4) and the armature (12).

6. The miniature proportional solenoid valve without magnetic isolation ring according to claim 1, characterized in that: The armature (12) has a stepped hole formed by a second through hole (27), a third blind hole (28) and a fourth blind hole (30) in sequence. The second through hole (27) and the third blind hole (28) are used to balance the pressure. The fourth blind hole (30) has a first pressure-guiding hole (29) on its wall. A spring (13) is installed in the third blind hole (28), and the composite rubber pad (14) is fitted into the fourth blind hole (30) with a gap. The free end of the spring (13) is connected to the composite rubber pad (14).

7. The miniature proportional solenoid valve without magnetic isolation ring according to claim 1, characterized in that: The solenoid valve also includes a yoke (6) and a pole shoe (5). The yoke (6) is sleeved on the stop (4). The yoke (6) has a fifth blind hole (31) and a sixth blind hole (32). A coil assembly (7) is installed in the fifth blind hole (31). The pole shoe (5) is installed in the sixth blind hole (32). The stop (4), the yoke (6) and the pole shoe (5) are connected to form a closed magnetic circuit. The end of the stop (4) away from the valve seat (2) extends out of the yoke (6) and is connected to a fastener (9). A large gasket (8) is provided between the fastener (9) and the outer wall of the yoke (6).

8. A miniature proportional solenoid valve without magnetic isolation ring according to claim 1, characterized in that: The valve body (1) is provided with an air inlet (19) and an air outlet (20). The air inlet (19) and the air outlet (20) are provided with a filter screen (18) and a filter screen gasket (17) for fixing the filter screen (18).

9. A miniature proportional solenoid valve without magnetic isolation ring according to any one of claims 1-8, characterized in that: The stop iron (4), armature (12), yoke iron (6), and pole shoe (5) are made of magnetically conductive metal materials, and their surfaces are all coated with a wear-resistant and corrosion-resistant coating.

10. A miniature proportional solenoid valve without magnetic isolation ring according to claim 9, characterized in that: The valve body (1), valve seat (2), leaf spring (16), spring (13), large washer (8), fastener (9), armature cap (15), and gasket (10) are all made of non-magnetic materials.

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