A stable opening and closing structure of a high-precision flow valve

Abstract

The present invention discloses a stable opening and closing structure of a high-precision flow valve, comprising an electromagnetic coil, a base, a ring seat, an opening and closing assembly and a spring; the spring is located above the base, the ring seat and the opening and closing assembly are located between the base and the spring, and the opening and closing assembly is located on the inner side of the ring seat; the opening and closing assembly comprises a movable plate and a sealing ring, and the sealing ring is fixedly arranged at the bottom of the movable plate; the electromagnetic coil is located on the upper side of the spring; this scheme optimizes the structure of the valve intake control, and a ring seat is arranged outside the movable plate, and the ring seat plays a certain guiding role in the lifting and lowering of the movable plate, ensuring that the movable plate will not be deflected during the intake process, so that the lower side of the movable plate can be evenly intaked, thereby ensuring the stability of the solenoid valve; the electromagnetic coil generates an upward suction force on the movable plate, and the spring generates a downward elastic force on the movable plate, and the height of the movable plate can be fine-tuned by changing the coil current, thereby changing the valve opening; a sealing ring is provided on the bottom surface of the movable plate, which can ensure the sealing of the valve after the coil is powered off.

Description

Technical Field

[0001] The invention relates to a stable opening and closing structure of a high-precision flow valve. Background Art

[0002] The solenoid valve is the main component for fluid flow control. The solenoid valve generally attracts the magnetic core through the electromagnetic coil and controls the flow rate by the opening of the magnetic core. The existing solenoid valve structure is not reasonable enough, resulting in an unstable intake structure and affecting the accuracy of flow control.

[0003] Recently, the applicant applied for a micro-flow valve control mechanism, in which the sealing ring is designed on the base, and in order to cooperate with the air intake of the base, an air intake hole needs to be opened on the sealing ring; but during testing, it was found that when the sealing ring is set on the base, the airtightness between the sealing ring and the base must also be considered, and very high requirements are placed on the processing accuracy and assembly accuracy of the sealing ring. If the sealing ring is changed to a solid one and fixed to the lower side of the moving plate, this problem can be avoided. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a stable opening and closing structure of a high-precision flow valve.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a stable opening and closing structure of a high-precision flow valve, comprising an electromagnetic coil, a base, a ring seat, an opening and closing assembly and a spring; the spring is located above the base, the ring seat and the opening and closing assembly are located between the base and the spring, and the opening and closing assembly is located on the inner side of the ring seat; the opening and closing assembly comprises a moving plate and a sealing ring, and the sealing ring is fixedly arranged at the bottom of the moving plate; the electromagnetic coil is located on the upper side of the spring, the electromagnetic coil generates an upward suction force on the moving plate, and the spring generates a downward elastic force on the moving plate.

[0006] Preferably, the sealing ring is a circular solid thin sheet structure, the lower surface of the moving plate has a receiving groove structure, and the upper part of the sealing ring is embedded in the receiving groove structure.

[0007] Preferably, a plurality of arcuate retaining walls are provided on the outer circumference of the upper side of the base, the upper surfaces of the plurality of arcuate retaining walls are flush, the ring seat rests on the arcuate retaining walls, and an air intake opening structure is formed between adjacent arcuate retaining walls.

[0008] Preferably, the outer circumference of the moving plate is loosely matched with the inner wall of the ring seat.

[0009] Preferably, when the electromagnetic coil generates an upward suction force on the movable plate, the distance between the bottom surface of the sealing ring and the upper surface of the base is the valve opening D, D=D1+D2; D1 is the maximum rising displacement distance of the movable plate before it contacts the elastic plate; D2 is the deformation amount of the elastic plate in the vertical direction after the movable plate contacts the elastic plate.

[0010] Preferably, the height of the ring seat is H1, the thickness of the opening and closing assembly is H2, and H1=H2+D1.

[0011] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0012] This solution optimizes the structure of the valve intake control. A ring seat is set outside the rotor. The ring seat plays a certain guiding role in the rise and fall of the rotor, ensuring that the rotor will not deflect during the intake process, so that the lower side of the rotor can intake air evenly, ensuring the stability of the solenoid valve operation; the electromagnetic coil generates an upward suction force on the rotor, and the spring generates a downward elastic force on the rotor. The height of the rotor can be fine-tuned by changing the coil current, thereby changing the valve opening; a sealing ring is set on the bottom surface of the rotor to ensure the sealing of the valve after the coil is powered off. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The technical solution of the present invention will be further described below with reference to the accompanying drawings:

[0014] Attachment Figure 1 A schematic diagram of a stable opening and closing structure of a high-precision flow valve according to the present invention;

[0015] Attachment Figure 2 This is a schematic diagram of the force structure of the opening and closing assembly of the present invention. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 1-2 As shown, the stable opening and closing structure of a high-precision flow valve described in the present invention comprises an electromagnetic coil, a base 1, a ring seat 2, an opening and closing assembly and a spring 4; a flow channel hole is provided on the base 1, the spring 4 is located above the base 1, and the ring seat 2 and the opening and closing assembly are located between the base 1 and the spring 4; the opening and closing assembly is located on the inner side of the ring seat 2, the opening and closing assembly comprises a movable plate 3 and a sealing ring 5, the sealing ring 5 is fixedly arranged at the bottom of the movable plate 3, the movable plate 3 and the spring 4 are both circular thin plate structures, the sealing ring 5 is a circular solid thin plate structure, the lower surface of the movable plate 3 has a receiving groove structure, and the upper part of the sealing ring 5 is embedded in the receiving groove structure; when the electromagnetic coil is not energized, the movable plate 3 falls on the upper surface of the base 1 with the sealing ring 5, closing the flow channel hole on the base 1, and the sealing ring 5 can be made of Teflon, nitrile rubber, silicone or the like; the outer circumference of the movable plate 3 is clearance-matched with the inner wall of the ring seat 2, so that the ring seat 2 can play a certain guiding role in the lifting and lowering of the movable plate 3;

[0018] A plurality of arc-shaped retaining walls are provided on the outer circumference of the upper side of the base 1. The upper surfaces of the plurality of arc-shaped retaining walls are flush with the upper surface of the portion where the flow channel hole is provided in the middle of the base 1. The ring seat 2 falls on the arc-shaped retaining walls, and an air intake opening structure is formed between adjacent arc-shaped retaining walls. Of course, the base 1 may also not be designed with an arc-shaped retaining wall structure, and the air intake opening structure may be transferred to the lower end of the ring seat 2, but the air intake opening structure must be lower than the lower surface of the moving plate 3.

[0019] The electromagnetic coil is located on the upper side of the elastic piece 4. When the electromagnetic coil is energized, it generates an upward magnetic attraction force F1 on the movable piece 3. After the movable piece 3 moves upward, it will press the elastic piece 4, so that the elastic piece 4 generates a downward elastic force F2 on the movable piece 3. When the fluid passes between the movable piece 3 and the base 1, it will generate a downward force F3 on the movable piece 3 due to the Bernoulli effect, F1=F2+F3; the current of the electromagnetic coil changes to change the magnetic attraction force F1, and F1 overcomes F2 and F3 to control the opening of the movable piece 3; different openings will produce different flow rates, achieving the effect of precise control of small flow rates.

[0020] When the electromagnetic coil generates an upward magnetic attraction force on the movable plate 3, the distance between the bottom surface of the sealing ring 5 and the upper surface of the base 1 is the valve opening D, D=D1+D2; D1 is the maximum upward displacement distance of the movable plate 3 before it contacts the elastic plate 4; D2 is the deformation amount of the elastic plate 4 in the vertical direction after the movable plate 3 contacts the elastic plate 4; under normal circumstances, D1 and D2 are not greater than 15 microns.

[0021] The height of the ring seat 2 is H1, and the overall thickness of the moving plate 3 and the sealing ring 5 is H2. H1=H2+D1. The ring seat 2 can be designed according to this formula during processing.

[0022] For the sake of convenience in illustration, the components are slightly separated in the figure. In reality, the lower side of the ring seat 2 should be in close contact with the base 1 , and the spring 4 should be pressed against the upper side of the ring seat 2 by the electromagnetic coil.

[0023] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A stable opening and closing structure of a high-precision flow valve, characterized by: The invention comprises an electromagnetic coil, a base (1), a ring seat (2), an opening and closing assembly and a spring (4); the spring (4) is located above the base (1), the ring seat (2) and the opening and closing assembly are located between the base (1) and the spring (4), and the opening and closing assembly is located on the inner side of the ring seat (2); the opening and closing assembly comprises a movable plate (3) and a sealing ring (5), and the sealing ring (5) is fixedly arranged at the bottom of the movable plate (3); the electromagnetic coil is located on the upper side of the spring (4), the electromagnetic coil generates an upward suction force on the movable plate (3), and the spring (4) generates a downward elastic force on the movable plate (3); the outer circumference of the movable plate (3) is in clearance fit with the inner wall of the ring seat (2); When the electromagnetic coil generates an upward suction force on the movable plate (3), the distance between the bottom surface of the sealing ring (5) and the upper surface of the base (1) is the valve opening D, where D=D1+D2; D1 is the maximum upward displacement distance of the movable plate (3) before the movable plate (3) contacts the elastic plate (4); and D2 is the deformation amount of the elastic plate (4) generated in the vertical direction after the movable plate (3) contacts the elastic plate (4).

2. The stable opening and closing structure of a high-precision flow valve according to claim 1 is characterized in that: The sealing ring (5) is a circular solid thin sheet structure. The lower surface of the moving plate (3) has a receiving groove structure, and the upper part of the sealing ring (5) is embedded in the receiving groove structure.

3. The stable opening and closing structure of a high-precision flow valve according to claim 1 is characterized in that: A plurality of arcuate retaining walls are provided on the outer circumference of the upper side of the base (1), the upper surfaces of the plurality of arcuate retaining walls are flush, the annular seat (2) falls on the arcuate retaining walls, and an air intake opening structure is formed between adjacent arcuate retaining walls.

4. The stable opening and closing structure of a high-precision flow valve according to claim 1 is characterized in that: The height of the ring seat (2) is H1, and the thickness of the opening and closing component is H2, where H1=H2+D1.

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