A dead volume free rocker arm three-way solenoid valve

Abstract

This invention relates to a three-way solenoid valve with a rocker arm and no dead volume, comprising a valve body, a valve seat, a common port, a normally open port, a normally closed port, a rocker arm, and a diaphragm. The valve seat covers the valve body, the rocker arm is disposed on the valve body, and the diaphragm is disposed on both the valve body and the rocker arm. The common port, normally open port, and normally closed port are all disposed on the valve seat. A curved first guide vane is provided below the common port. A long, block-shaped fourth guide vane is fixedly connected to the diaphragm on one side of the first guide vane. The first guide vane and the fourth guide vane constitute a flow guiding structure, which divides the fluid flowing into the common port into two streams: one stream flows to the normally closed port, and the other flows to the normally open port. This invention utilizes basic fluid mechanics principles and innovates the internal valve structure design, enabling subsequent fluids (including liquids or gases) to completely replace and discharge the reagents originally present in the valve, especially those in dead flow areas.

Description

Technical Field

[0001] This invention relates to the fields of rocker arm solenoid valve technology and analytical instrument technology. Specifically, it utilizes the sweeping flow principle in fluid mechanics to design a sweeping flow structure, achieving a residue-free effect for fluids (including liquids or gases) within the rocker arm three-way solenoid valve, thereby improving experimental accuracy and precision. It is a dead-volume-free rocker arm three-way solenoid valve suitable for medical, environmental, and analytical instrument applications. Background Technology

[0002] The rocker arm solenoid valves currently used in medical applications are patented products invented in Japan, the United States, and Germany twenty years ago, and the patent protection has expired. The most similar patented technology in China is the "rocker arm miniature solenoid valve, CN200720103486.7", which has also expired. Related technologies at home and abroad have certain advantages, such as the advanced rocker arm technology, which can solve the pump effect problem caused by non-rocker arm solenoid valves, etc.

[0003] Currently, rocker arm solenoid valves are relatively advanced and delicate components, so they are often installed in sophisticated, cutting-edge, and expensive experimental analytical equipment. Because these devices are very sophisticated, cutting-edge, and expensive, in order to save on experimental costs and high expenses, they are usually not dedicated to the experimental detection of a single fluid (including liquid or gaseous reagents), but rather different fluids (including liquid or gaseous reagents) flow through them at different times. However, because current technology and research focus too much on rocker arm technology, a drawback of existing rocker arm valve technology has been overlooked: there is a dead volume inside the valve. When two fluids (including liquid or gaseous reagents) pass through it, the reagents remaining in the valve affect the accuracy of the measurement. This is due to the structure of the rocker arm valve. Currently, all rocker arm solenoid valve manufacturers in the world are aware of this problem, but it has not been perfectly solved. Therefore, Shenzhen's key research project "N015" in 2019 proposed that the medical community needs rocker arm solenoid valves without dead volume and hopes that large enterprises with the capability can complete the research and development. Our company has been researching and manufacturing rocker arm solenoid valves for more than ten years. Based on the problem of dead volume, we have invented a rocker arm three-way solenoid valve without dead volume, so that there are no dead flow corners in the flow channel inside the valve. That is, the subsequent fluid (including liquid or gaseous reagents) completely replaces and discharges the reagents originally present in the valve.

[0004] Therefore, this invention discloses a rocker arm three-way solenoid valve with no dead volume, which utilizes the sweeping principle in fluid mechanics to design a sweeping structure, achieving the effect of no fluid (including liquid or gaseous reagents) residue inside the rocker arm three-way solenoid valve, thereby improving the accuracy and precision of experiments. Summary of the Invention

[0005] The purpose of this invention is to provide a dead-volume-free rocker arm three-way solenoid valve that utilizes the sweeping principle in fluid mechanics to design a sweeping structure, achieving a residue-free fluid (including liquids or gases) inside the rocker arm three-way solenoid valve, thereby improving experimental accuracy and precision. This is applicable to the fields of medical and environmental protection as well as analytical instruments.

[0006] A three-way solenoid valve with a rocker arm and no dead volume includes a valve body, a valve seat, a common port, a normally open port, a normally closed port, a rocker arm, and a diaphragm. The valve seat covers the valve body, the rocker arm is disposed on the valve body, and the diaphragm is disposed on both the valve body and the rocker arm. The common port, normally open port, and normally closed port are all disposed on the valve seat. The valve body is characterized in that: a curved first guide vane is provided below the common port, and a long, block-shaped fourth guide vane is fixedly connected to one side of the first guide vane. The first guide vane and the fourth guide vane constitute a flow guiding structure, which divides the fluid flowing into the common port into two streams, one stream flowing to the normally closed port and the other stream flowing to the normally open port.

[0007] Furthermore, the common port, normally open port, and normally closed port are arranged in a triangular pattern on the valve seat.

[0008] Furthermore, a cylindrical second guide vane is provided on the left side of the diaphragm, the upper surface of the second guide vane being a first inclined surface, the first inclined surface being located below the normally closed opening; a cylindrical third guide vane is provided on the right side of the diaphragm, the upper surface of the third guide vane being a second inclined surface, the second inclined surface being located below the normally open opening.

[0009] Furthermore, the first guide vane is disposed on the diaphragm below the common port, and the first guide vane is an inverse function curved surface structure with a cross-section shaped like a "mountain peak".

[0010] Furthermore, the upper surface of the fourth guide vane is a third inclined surface.

[0011] Further, the first inclined plane is tilted counterclockwise by 3 to 15 degrees along the horizontal direction from the normally closed opening to the normally open opening, and can be selected from any one of 4 degrees, 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees, 10 degrees, 11 degrees, 12 degrees, 13 degrees, and 14 degrees. The second inclined plane is tilted clockwise by 3 to 15 degrees along the horizontal direction from the normally closed opening to the normally open opening, and can be selected from any one of 4 degrees, 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees, 10 degrees, 11 degrees, 12 degrees, 13 degrees, and 14 degrees.

[0012] Furthermore, the lower opening of the common port has a smooth transition, the lower periphery of the normally closed port forms a stepped first protrusion towards the valve seat, and the lower periphery of the normally open port forms a stepped second protrusion towards the valve seat.

[0013] Furthermore, the normally open and normally closed openings are symmetrically arranged relative to the first guide vane.

[0014] Furthermore, the tilt angle of the rocker arm is -15 to 15 degrees along the horizontal direction from the normally closed opening to the normally open opening (where -15 to 0 degrees is clockwise tilt and 0 to 15 degrees is counterclockwise tilt), and can be selected as any one of -4 degrees, -5 degrees, -6 degrees, -7 degrees, -8 degrees, -9 degrees, -10 degrees, -11 degrees, -12 degrees, -13 degrees, -14 degrees, 4 degrees, 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees, 10 degrees, 11 degrees, 12 degrees, 13 degrees, and 14 degrees.

[0015] The above structure achieves the following effects: This technical solution utilizes fundamental fluid mechanics knowledge to innovate a new flow scheme, significantly improving reagent flow, controlling reagent flow within the valve, and eliminating dead zones. Firstly, by fully leveraging fluid mechanics techniques, a first guide vane with a special curved surface and a fourth guide vane in the common port of the valve are innovatively designed. These two elements form a guide structure that divides the flow channel in two, splitting the fluid flowing into the common port into two streams: one flowing towards the normally closed port and the other towards the normally open port. Fluid kinetic energy guides the fluid to sweep away dead zones and eliminate dead volume. Simultaneously, the fourth guide vane prevents short-circuit flow; the absence of the fourth guide vane would lead to sweeping failure. Secondly, a second and third guide vane with a sloping upper surface are innovatively designed at the normally closed and normally open ports, respectively, using fluid kinetic energy to guide the fluid to sweep away dead zones. Third, the triangular distribution of the three-way valve's common, normally open, and normally closed ports ensures smooth fluid flow, completely altering the fluid circulation within the valve and eliminating dead volume. Fourth, a unique flow-guiding structure within the valve ensures no dead zones in any reverse flow, and the alternation of forward and reverse flow enhances fluid replacement through sweeping. Through these innovations, especially the addition of a second and third flow-guiding wing to the existing first and fourth wing-based flow-guiding mechanism, the sweeping effect is optimal, completely changing the fluid circulation within the valve, eliminating dead volume, and achieving a residue-free effect for fluids (including liquids or gases) within the rocker arm three-way solenoid valve. This allows sophisticated experimental analytical equipment to smoothly and accurately detect and analyze different fluids (including liquids or gases) at different times, improving experimental accuracy and precision, resulting in exceptionally significant economic benefits and experimental effects. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the rocker arm three-way solenoid valve structure of the present invention, in which fluid flows from the normally closed port to the common port.

[0017] Figure 2 for Figure 1A magnified view of a portion of region S1.

[0018] Figure 3 for Figure 1 A top view of a rocker arm three-way solenoid valve.

[0019] Figure 4 This is a schematic diagram of the rocker arm three-way solenoid valve structure of the present invention, in which fluid flows from a common port to a normally closed port.

[0020] Figure 5 for Figure 4 A magnified schematic diagram of a portion of region S2.

[0021] Figure 6 for Figure 4 A top view of a rocker arm three-way solenoid valve.

[0022] Figure 7 for Figure 1 Computer fluid dynamics simulation diagram of a rocker arm three-way solenoid valve.

[0023] Figure 8 for Figure 4 Computer fluid dynamics simulation diagram of a rocker arm three-way solenoid valve.

[0024] In the figure, 1. rocker arm three-way solenoid valve, 11. valve body, 12. valve seat, 13. diaphragm, 14. rocker arm, 15. moving iron and spring, 16. first guide vane, 17. second guide vane, 18. first inclined surface, 19. third guide vane, 111. second inclined surface, 112. first protrusion, 113. normally closed port, 114. common port, 115. normally open port, 116. fourth guide vane, 2. second protrusion. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] The fluids mentioned in this article include liquids or gases, hereinafter the same. Figures 1 to 8As shown, a three-way solenoid valve 1 with a rocker arm and no dead volume includes a valve body 11, a valve seat 12, a common port 114, a normally closed port 113, a normally open port 115, a rocker arm 14, and a diaphragm 13. The valve seat 12 covers the valve body 11, the rocker arm 14 is disposed on the valve body 11, and the diaphragm 13 is disposed on the valve body 11 and the rocker arm 14. The common port 114, the normally closed port 113, and the normally open port 115 are all disposed on the valve seat 12. The valve body 11 is provided with a movable iron and a spring 15. When energized, the rocker arm 14, driven by the movable iron and spring 15, causes the diaphragm 13 to move, thereby switching the normally closed port 113 to open and the normally open port 115 to close. The valve body 11, valve seat 12, common port 114, diaphragm 13, and normally closed port 113 together form a fluid flow channel. When de-energized, the rocker arm 14, driven by the movable iron and spring 15, causes the diaphragm 13 to move, thereby switching the normally closed port 113 to close and the normally open port 115 to open. The valve body 11, valve seat 12, common port 114, diaphragm 13, and normally open port 115 together form a fluid flow channel.

[0027] Below the common inlet 114, a curved first guide vane 16 is provided, and a long strip-shaped fourth guide vane 116 is fixedly connected to a diaphragm 13 on one side of the first guide vane 16 (see...). Figure 3 , Figure 6 The first guide vane 16 and the fourth guide vane 116 form a flow guiding structure, which divides the fluid flowing into the common inlet 114 into two streams: one stream flows to the normally open inlet 115, and the other flows to the normally closed inlet 113. The first guide vane 16 is preferably an inverse function curved surface structure with a "mountain peak" shaped cross-section. (See [reference]). Figure 1 , Figure 3 As shown. The first guide vane 16, based on fundamental fluid mechanics theory, divides the fluid in two, using fluid kinetic energy to guide the fluid and sweep away dead zones, eliminating dead volume. The fourth guide vane 116 prevents short-circuit flow; the absence of the fourth guide vane 116 would lead to sweeping failure. Furthermore, the lower opening of the common port 114 has a smooth transition, which facilitates fluid swirling and enhances the sweeping effect. Additionally, the upper surface of the fourth guide vane 116 is designed as a third inclined surface. During the process of the rocker arm 14 driving the diaphragm 13 to switch flow channels under the drive of the moving iron and spring 15 (i.e., during the rocker arm diaphragm swing), this third inclined surface seals the flow channel, improving sweeping efficiency. The first guide vane 16 and the fourth guide vane 116 can be mounted on the valve seat 12, and the diaphragm 13 can be replaced with other materials.

[0028] A cylindrical second guide vane 17 with a first inclined surface 18 is provided on the left side of the diaphragm 13. The first inclined surface 18 is located below the normally closed port 113. When energized, the movable iron and spring 15 act on the rocker arm 14 to open the normally closed port 113. A cylindrical third guide vane 19 with a second inclined surface 111 is provided on the right side of the diaphragm 13. The second inclined surface 111 is located below the normally open port 115. When de-energized, the movable iron and spring 15 act on the rocker arm 14 to open the normally open port 115. The first inclined surface 111 is inclined counterclockwise by 3 to 15 degrees along the horizontal direction from the normally closed port 113 to the normally open port 115, and can be selected from any one of 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 14 degrees. The second inclined plane 18 is inclined clockwise at an angle of 3 to 15 degrees along the horizontal direction from the normally closed opening 113 to the normally open opening 115, and can be selected from any one of 4 degrees, 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees, 10 degrees, 11 degrees, 12 degrees, 13 degrees, and 14 degrees.

[0029] The second guide vane 17 fully utilizes the "sweeping" technology of fluid mechanics, innovatively designing a cylindrical structure with a "first inclined plane 18" on the diaphragm 13 region below the normally closed port 113 of the valve. Utilizing the sweeping principle of fluid kinetic energy, it guides the fluid to impact the dead zone within the valve region below the normally closed port 113, eliminating the dead volume within the valve at the lower part of the normally closed port 113. Similarly, the third guide vane 19 fully utilizes the "sweeping" technology of fluid mechanics, innovatively designing a cylindrical structure with a "second inclined plane 111" on the diaphragm 13 region below the normally open port 115 of the valve. Utilizing the sweeping principle of fluid kinetic energy, it guides the fluid to impact the dead zone within the valve region below the normally open port 115, eliminating the dead volume within the valve at the lower part of the normally open port 115. The "sweeping" effect is best when the angle of the first inclined plane 18 is 8 degrees counterclockwise along the horizontal direction from the normally closed port 113 to the normally open port 115, or when the angle of the second inclined plane 111 is 8 degrees clockwise along the horizontal direction from the normally closed port 113 to the normally open port 115. That is, when energized, the fluid flowing towards the normally open port 115 flows around it under the action of the second guide vane 17 and the third guide vane 19, sweeping to zero dead volume, and finally flows out through the normally closed port 113. When de-energized, since the flow channel structure is symmetrical about the normally closed port 113 and the normally open port 115, the sweeping occurs around the normally closed port 113, and the outlet is the normally open port 115. The second guide vane 17 and the third guide vane 19 work in conjunction with the first guide vane 16 and the fourth guide vane 116 to further enhance the sweeping effect of the original guide structure composed of the first guide vane 16 and the fourth guide vane 116.

[0030] In addition, the lower periphery of the normally closed port 113 forms a stepped first protrusion 112 towards the valve seat 12, and the lower periphery of the normally open port 115 forms a stepped second protrusion 2 towards the valve seat 12. The first protrusion 112 or the second protrusion 2 has the technical effect of blocking the flow of fluid, which is conducive to forming a swirling flow and enhancing the sweeping effect on the dead volume inside the valve at the lower part of the normally closed port 113 or the normally open port 115.

[0031] The common port 114, normally closed port 113, and normally open port 115 are arranged in a triangular pattern on the valve seat 12. This triangular arrangement of the three ports of the tee allows for unobstructed fluid flow, thus completely altering the fluid flow pattern within the valve and eliminating dead volume. Preferably, the normally closed port 113 and normally open port 115 are symmetrically arranged relative to the first guide vane 16, ensuring uniform fluid kinetic energy distribution in both directions and achieving the best sweeping effect.

[0032] The tilt angle of the rocker arm 14 is -15 to 15 degrees in the horizontal direction from the normally closed port 113 to the normally open port 115, and can be selected from any one of -4 degrees, -5 degrees, -6 degrees, -7 degrees, -8 degrees, -9 degrees, -10 degrees, -11 degrees, -12 degrees, -13 degrees, -14 degrees, 4 degrees, 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees, 10 degrees, 11 degrees, 12 degrees, 13 degrees, and 14 degrees. The angle of the fluid flow channel can be adjusted by rotating the rocker arm 14, reducing the deformation area of ​​the diaphragm 13, and further improving the sweeping effect of the fluid.

[0033] See Figure 1 , Figure 4 , Figure 7 and Figure 8 The fluid can also flow in reverse. When energized, the fluid flows from the normally closed port 113 to the common port 114. Guided by the second guide vane 17 and the fourth guide vane 116 (both cylindrical structures) and the first guide vane 16 (an inverse function surface structure), one stream of fluid sweeps around the normally open port 115 and then flows to the common port 114, while the other stream flows directly to the common port 114. When not energized, since the flow channel structure is symmetrical about the normally closed port 113 and the normally open port 115, the sweeping occurs around the normally closed port 113, and the outlet remains at the common port 114. Alternating forward and reverse sweeping flows can improve the fluid replacement effect.

Claims

1. A three-way solenoid valve with a rocker arm and no dead volume, comprising a valve body, a valve seat, a common port, a normally open port, a normally closed port, a rocker arm, and a diaphragm, wherein the valve seat covers the valve body, the rocker arm is disposed on the valve body, the diaphragm is disposed on the valve body and the rocker arm, and the common port, normally open port, and normally closed port are all disposed on the valve seat, characterized in that: Below the common port, there is a curved first guide vane. A long block-shaped fourth guide vane is fixedly connected to one side of the first guide vane. The first guide vane and the fourth guide vane constitute a guide structure. This guide structure divides the fluid flowing into the common port into two streams, one stream flows to the normally closed port and the other stream flows to the normally open port. A cylindrical second guide vane is provided on the left side of the diaphragm, the upper surface of which is a first inclined surface, and the first inclined surface is located below the normally closed opening. A cylindrical third guide vane is provided on the right side of the diaphragm, the upper surface of which is a second inclined surface, and the second inclined surface is located below the normally open opening. The first guide vane is disposed on the diaphragm below the common port. The first guide vane is an inverse function curved surface structure with a cross-section shaped like a "mountain peak". The upper surface of the fourth guide vane is a third inclined surface, and the first guide vane and the fourth guide vane are arranged perpendicularly to each other; The common port, normally open port, and normally closed port are arranged in a triangular pattern on the valve seat.

2. The dead-volume rocker arm three-way solenoid valve according to claim 1, characterized in that: The first inclined plane is inclined counterclockwise by 3 to 15 degrees along the horizontal direction from the normally closed opening to the normally open opening, and the second inclined plane is inclined clockwise by 3 to 15 degrees along the horizontal direction from the normally closed opening to the normally open opening.

3. The dead-volume rocker arm three-way solenoid valve according to claim 1, characterized in that: The lower opening of the common port has a smooth transition, the lower periphery of the normally closed port forms a stepped first protrusion towards the valve seat, and the lower periphery of the normally open port forms a stepped second protrusion towards the valve seat.

4. The dead-volume-free rocker arm three-way solenoid valve according to claim 1, characterized in that: The normally open and normally closed ports are symmetrically arranged relative to the first guide vane.

5. A three-way solenoid valve with a rocker arm and no dead volume as described in claim 1, characterized in that: The rocker arm is tilted at an angle of -15 to 15 degrees along the horizontal direction from normally closed to normally open, where -15 to 0 degrees is clockwise tilt and 0 to 15 degrees is counterclockwise tilt.

6. A three-way solenoid valve with a rocker arm and no dead volume as described in claim 2, characterized in that: The first inclined plane is tilted counterclockwise along the horizontal direction from the normally closed opening to the normally open opening at an angle of any one of 4 degrees, 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees, 10 degrees, 11 degrees, 12 degrees, 13 degrees, and 14 degrees.

7. A three-way solenoid valve with a rocker arm and no dead volume as described in claim 2, characterized in that: The second inclined plane is inclined clockwise along the horizontal direction from the normally closed opening to the normally open opening by any one of the following: 4 degrees, 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees, 10 degrees, 11 degrees, 12 degrees, 13 degrees, or 14 degrees.

8. A three-way solenoid valve with a rocker arm and no dead volume as described in claim 5, characterized in that: The tilt angle of the rocker arm is any one of the following along the horizontal direction from the normally closed opening to the normally open opening: -4 degrees, -5 degrees, -6 degrees, -7 degrees, -8 degrees, -9 degrees, -10 degrees, -11 degrees, -12 degrees, -13 degrees, -14 degrees, 4 degrees, 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees, 10 degrees, 11 degrees, 12 degrees, 13 degrees, 14 degrees.

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