MICRO-FLOW VALVE CONTROL MECHANISM

Abstract

The present disclosure discloses a micro-flow valve control mechanism, which comprises an electromagnetic coil, a base, a ring seat, a moving plate and an elastic plate; wherein the elastic plate is positioned above the base, the ring seat and the moving plate are positioned between the base and the clastic plate, the moving plate is positioned at the inner side of the ring seat. In this scheme, the structure of valve air intake control is optimized, and the ring seat plays the guiding role in the lifting of the moving plate to a certain extent, which ensures that the moving plate will not deflect in the air intake process, so that the outer ring at the lower side of the moving plate can allow air to enter uniformly, thus ensuring the working stability of the electromagnetic valve.

Claims

1. A micro-flow valve control mechanism, comprising an electromagnetic coil, a base (1), a ring seat (2), a moving plate (3) and an elastic plate (4), wherein the elastic plate (4) is positioned above the base (1), the ring seat (2) and the moving plate (3) are positioned between the base (1) and the elastic plate (4), the moving plate (3) is positioned at the inner side of the ring seat (2), and the base (1) is provided with a sealing ring (5) matched with the moving plate (3); the electromagnetic coil is positioned at the upper side of the elastic plate (4), the electromagnetic coil generates upward attraction force to the moving plate (3), and the elastic plate (4) generates downward elastic force to the moving plate (3).

2. The micro-flow valve control mechanism according to claim 1, wherein the outer circumference of the upper side of the base (1) is provided with a plurality of are-shaped retaining walls, the upper surfaces of the plurality of arc-shaped retaining walls are flush, the ring seat (2) is located on the arc-shaped retaining walls, and an air intake opening structure is formed between adjacent arc-shaped retaining walls.

3. The micro-flow valve control mechanism according to claim 1, wherein the outer circumference of the moving plate (3) is in clearance fit with the inner wall of the ring seat (2).

4. The micro-flow valve control mechanism according to claim 1, wherein when the electromagnetic coil generates upward attraction force to the moving plate (3), the distance between the moving plate (3) and the sealing ring (5) is valve opening degree D, where D=D1+D2; D1 is the maximum lifting displacement distance of the moving plate (3) before the moving plate (3) is in contact with the elastic plate (4); and D2 is the deformation of the elastic plate (4) generated in the vertical direction after the moving plate (3) is in contact with the elastic plate (4).

5. The micro-flow valve control mechanism according to claim 4, wherein the height of the ring seat (2) is H1, the thickness of the moving plate (3) is H2, and the height of the sealing ring (5) is H3, where H1=H2+H3+D1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The technical scheme of the present disclosure will be further explained with reference to the drawings hereinafter.

[0012] FIG. 1 is a schematic diagram of a micro-flow valve control mechanism according to the present disclosure.

[0013] FIG. 2 is a schematic diagram of a stress structure of a moving plate according to the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The present disclosure will be further explained in detail with reference to the drawings and specific embodiments hereinafter.

[0015] As shown in FIG. 1 to FIG. 2, the micro-flow valve control mechanism of the present disclosure comprises an electromagnetic coil, a base 1, a ring seat 2, a moving plate 3 and an elastic plate 4, wherein the elastic plate 4 is positioned above the base 1, the ring seat 2 and the moving plate 3 are positioned between the base 1 and the elastic plate 4, and both the moving plate 3 and the elastic plate 4 are circular sheet structures; the moving plate 3 is positioned at the inner side of the ring seat 2, and the outer circumference of the moving plate 3 is in clearance fit with the inner wall of the ring seat 2, so that the ring seat 2 plays the guiding role in the lifting of the moving plate 3 to a certain extent; the base 1 is provided with a sealing ring 5 matched with the moving plate 3, and runner holes on the base 1 are located in the inner ring of the sealing ring 5. When the electromagnetic coil is not powered on, the moving plate 3 is located on the sealing ring 5 to seal the runner holes on the base 1. The sealing ring 5 can be made of Teflon, nitrile rubber buna, silica gel and other materials.

[0016] The outer circumference of the upper side of the base 1 is provided with a plurality of arc-shaped retaining walls, the upper surfaces of the plurality of arc-shaped retaining walls are flush, the ring seat 2 is located on the arc-shaped retaining walls, and an air intake opening structure is formed between adjacent arc-shaped retaining walls. Of course, it is not necessary to design an are-shaped retaining wall structure on the base 1, and the air intake opening structure can 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.

[0017] The electromagnetic coil is located at the upper side of the elastic plate 4. After the electromagnetic coil is powered on, upward magnetic attraction force F.sub.1 is generated to the moving plate 3. After moving upward, the moving plate 3 will press the elastic plate 4, so that the elastic plate 4 generates downward elastic force F.sub.2 to the moving plate 3. When passing between the moving plate 3 and the base 1, fluid will generate downward acting force F.sub.3 to the moving plate 3 due to Bernoulli effect, where F.sub.1=F.sub.2+F.sub.3. The current in the electromagnetic coil changes so as to change the magnetic attraction force F.sub.1, and F.sub.1 overcomes F.sub.2 and F.sub.3 to control the opening degree of the moving plate 3. Different opening degrees will produce different flow, and achieve the effect of precise control of micro flow. Thus, the micro flow will be proportionally controlled through electromagnetic valve.

[0018] When the electromagnetic coil generates upward magnetic attraction force to the moving plate 3, the distance between the moving plate 3 and the sealing ring 5 is valve opening degree D, where D=D1+D2; D1 is the maximum lifting displacement distance of the moving plate 3 before the moving plate 3 is in contact with the elastic plate 4; and D2 is the deformation of the elastic plate 4 generated in the vertical direction after the moving plate 3 is in contact with the elastic plate 4. Generally, D1 and D2 are not larger than 15 microns.

[0019] The height of the ring seat 2 is H1, the thickness of the moving plate 3 is H2. and the height of the sealing ring 5 is H3, where H1=H2+H3+D1. The ring seat 2 can be designed according to this formula during processing. However, as a part of the sealing ring 5 is generally buried in the base 1, the height H3 of the sealing ring 5 mentioned in the formula refers to the height of the sealing ring 5 higher than the mating surface of the ring seat 2 and the base 1.

[0020] In the figure, for the convenience of illustration, the components are slightly separated, but in fact, the lower side of the ring seat 2 should be tightly attached to the base 1, and the elastic plate 4 should be pressed by the electromagnetic coil at the upper side of the ring seat 2.

[0021] The above embodiments are only to illustrate the technical concept and characteristics of the present disclosure, aiming at enabling those skilled in the art to understand and implement the content of the present disclosure, rather than limit the scope of protection of the present disclosure. All equivalent changes or modifications made according to the spirit of the present disclosure should be included in the scope of protection of the present disclosure.