non-return valve

Abstract

The objective is to provide a check valve capable of suppressing the vibration of the valve body. [Solution] A check valve comprising a first member having a first surface, a second member having a second surface facing the first surface of the first member, and a valve body provided between the first surface and the second surface, wherein the fluid flow path is blocked when the valve body contacts the first surface, and the fluid flow path is opened when the valve body contacts the second surface, the second surface has a tapered shape in the direction from the first member toward the second member, and when the fluid flow rate is low, the tip of the valve body contacts the second surface, and when the fluid flow rate is high, the valve body has a shape that conforms to the tapered shape of the second surface.

Description

Technical Field

[0001] The present invention relates to a check valve.

Background Art

[0002] [[ID=II]] A check valve may be provided in a fluid flow path (for example, Patent Document 1, etc.).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The check valve opens and closes by deformation of the valve body. When the valve opens, the valve body contacts the stopper and the flow path is opened. Turbulence may occur in the fluid. Due to the turbulence, a force that lifts the valve body from the stopper is generated. Such a force may cause the valve body to vibrate and generate abnormal sounds. Therefore, an object is to provide a check valve capable of suppressing the sway of the valve body.

Means for Solving the Problems

[0005] The above object can be achieved by a check valve including a first member having a first surface, a second member having a second surface facing the first surface of the first member, and a valve body provided between the first surface and the second surface, wherein the fluid flow path is blocked when the valve body contacts the first surface, the flow path is opened when the valve body contacts the second surface, the second surface has a tapered shape in a direction from the first member toward the second member, when the flow rate of the fluid is low, the tip of the valve body contacts the second surface, and when the flow rate of the fluid is high, the valve body assumes a shape along the tapered shape of the second surface.

[0006] A fluid channel may be formed between the first surface and the second surface.

[0007] The second member may be provided with a hole that penetrates the second member in a direction toward the valve body.

[0008] The second member may have a slit on its second surface, and the slit may function as a fluid passage.

[0009] The valve body may be made of rubber. [Effects of the Invention]

[0010] This provides a check valve capable of suppressing the vibration of the valve body. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a cross-sectional view illustrating a check valve according to the first embodiment. [Figure 2] Figures 2(a) and 2(b) are enlarged cross-sectional views of the valve body. [Figure 3] Figure 3 is a cross-sectional view illustrating a check valve according to the second embodiment. [Modes for carrying out the invention]

[0012] <First Embodiment> The vehicle control device of this embodiment will be described below with reference to the drawings. Figure 1 is a cross-sectional view illustrating a check valve 100 according to the first embodiment, showing the check valve 100 in a closed state. Axis A is the central axis of the check valve 100 in the Z-axis direction. The check valve 100 is, for example, rotationally symmetric with respect to axis A. The X-axis, Y-axis, and Z-axis directions are orthogonal to each other.

[0013] The check valve 100 is installed in the fluid passage. The fluid is, for example, a gas. The check valve 100 has a housing 10 (first member), a stopper 20 (second member), and a valve body 30.

[0014] The housing 10 has a surface 12 (first surface) and a surface 14, and a flow path 16. Surfaces 12 and 14 are inner wall surfaces. Surface 12 is parallel to the XY plane. Surface 14 is parallel to the Z axis and rises from surface 12. The space inside the housing 10 is formed in the area enclosed by surfaces 12 and 14. The stopper 20 and the valve body 30 are housed in the space inside the housing 10. The flow path 16 penetrates the housing 10 in the Z axis direction and connects the outside of the housing 10 to the space inside the housing 10.

[0015] The stopper 20 has a hole 21, a surface 22 (second surface), and a surface 24. Surfaces 22 and 24 are the inner wall surfaces. Surface 24 is spaced apart from surface 14 and faces surface 14. Surface 24 is, for example, parallel to the Z-axis direction. The hole 21 is provided in the center of the stopper 20 in the XY plane. The hole 21 penetrates the stopper 20 in the Z-axis direction.

[0016] Surface 22 is spaced apart from and opposite to surface 12 of the housing 10. Surface 22 is inclined with respect to the XY plane and has a tapered shape in the Z-axis direction. Surface 22 tapers from surface 12 towards the hole 21. The inclination angle of surface 22 from the XY plane may be, for example, 10° or less, or 10° or more.

[0017] A channel 18 is formed between surface 12 and surface 22. A channel 19 is formed between surface 14 and surface 24. Channel 16 and channel 18 are in communication. Channel 18 and channel 19 are in communication.

[0018] The valve body 30 is made of rubber, for example, and has a shaft 32 and a projection 34. The shaft 32 is attached to the housing 10. The projection 34 is an umbrella-shaped portion that protrudes outward from the shaft 32. The projection 34 is thicker, for example, closer to the shaft 32 and thinner further away from the shaft 32. The projection 34 elastically deforms in response to the fluid pressure. The deformation of the projection 34 causes the check valve 100 to close and open.

[0019] The valve body 30 is, for example, circular in the XY plane. As shown in FIG. 1, in the closed valve state, the valve body 30 is umbrella-shaped. The protruding portion 34 of the valve body 30 has a shape that hangs downward toward the housing 10, contacts the surface 12 of the housing 10, and blocks the flow path 18. The fluid flows from the flow path 16 to the inside of the housing 10 but is stopped by the valve body 30.

[0020] FIGS. 2(a) and 2(b) are enlarged cross-sectional views of the valve body 30, showing the open valve state. The surface 35 of the valve body 30 faces the surface 12 of the housing 10. The surface 37 of the valve body 30 is the surface opposite to the surface 35 and faces the surface 22 of the stopper 20. Let the tip of the protruding portion 34 be the tip portion 36. In the closed valve state, the tip portion 36 contacts the surface 12 of the housing 10. The surfaces 35 and 37 are exposed to the fluid.

[0021] As shown in FIGS. 2(a) and 2(b), under the pressure of the fluid, the protruding portion 34 of the valve body 30 is deformed upward in the figure. The protruding portion 34 separates from the housing 10 and moves toward the stopper 20. The stopper 20 restricts the movement of the protruding portion 34. When the protruding portion 34 contacts the surface 22 of the stopper 20, the flow path 18 is opened and the check valve 100 is opened. The fluid flows through the flow path 16, the flow path 18, and the flow path 19.

[0022] The flow rate of the fluid in FIG. 2(a) is more than the flow rate in FIG. 1 and less than the flow rate in FIG. 2(b). In FIG. 2(a), the tip portion 36 of the protruding portion 34 contacts the surface 22 of the stopper 20. The surfaces 35 and 37 of the protruding portion 34 are exposed to the fluid.

[0023] The pressure upstream of the flow path is higher than the pressure downstream. A part of the fluid flowing through the flow path 19 flows into the inside of the hole 21 of the stopper 20. The pressure inside the hole 21 is about the same as the pressure inside the flow path 19. The pressures in the flow paths 16 and 18 are higher than the pressures in the flow path 19 and the hole 21.

[0024] The surface 35 of the valve body 30 is subjected to a pressure similar to that of the flow path 18. The surface 37 is subjected to a pressure similar to that of the inside of the hole 21 of the stopper 20. Since the pressure on surface 37 is lower than the pressure on surface 35, a pressure difference is generated. Due to the pressure difference, the valve body 30 moves toward the stopper 20. Because the surface 22 of the stopper 20 is tapered, a space is created between the surface 37 and surface 22 of the valve body 30, exposing surface 37 and increasing the pressure-receiving area. Therefore, the protrusion 34 is more susceptible to pressure differences. By continuously receiving pressure differences, the protrusion 34 maintains the state shown in Figure 2(a). In other words, the valve body 30 is less prone to vibration, and the tip 36 maintains stable contact with surface 24.

[0025] The fluid flow rate in Figure 2(b) is greater than the flow rate in Figure 2(a). As the flow rate increases, the pressure on the surface 35 of the valve body 30 increases. Because the surface 22 of the stopper 20 is tapered, the protrusion 34 deforms further in the Z-axis direction, becoming a shape that follows the surface 22. That is, the protrusion 34 becomes a wedge shape that is convex in the Z-axis direction. Surface 37 comes into contact with the surface 22 of the stopper 20. The fluid in the flow path 18 presses the wedge-shaped protrusion 34 against the surface 22. As a result, the valve body 30 becomes stable and less prone to vibration.

[0026] According to the first embodiment, a flow path 18 is formed between the surface 12 of the housing 10 and the surface 22 of the stopper 20. When the valve body 30 comes into contact with the surface 22, the flow path 18 opens and the check valve 100 opens. Because the surface 22 has a tapered shape, the valve body 30 deforms according to the fluid flow rate. This makes it possible to suppress the vibration of the protruding portion 34 of the valve body 30.

[0027] Specifically, as shown in Figure 2(a), when the flow rate is low, the tip 36 of the protrusion 34 contacts the surface 22. The surface 37 of the protrusion 34 does not contact the surface 22 and is exposed to the fluid. The area of ​​the valve body 30 that receives the differential pressure (pressure-receiving area) increases. The valve body 30 remains stable in its deformed state and is less prone to vibration.

[0028] As shown in Figure 2(b), when the fluid flow rate increases compared to the example in Figure 2(a), the protrusion 34 deforms into a wedge shape along the tapered shape of the surface 22. Turbulence is more likely to occur when the fluid velocity increases. According to the first embodiment, the valve body 30 is pressed against the surface 22 by the fast-flowing fluid and deforms along the tapered shape. Because the protrusion 34 is pressed against the surface 22, the valve body 30 stabilizes in a deformed state. That is, since the valve body 30 maintains the shape shown in Figure 2(b), vibration of the valve body 30 is less likely to occur. The vibration of the valve body 30 can be suppressed, and abnormal noise associated with vibration is less likely to occur.

[0029] As shown in Figure 1, the stopper 20 has a hole 21. The surface 37 of the valve body 30 is subjected to a pressure similar to that inside the hole 21 of the stopper 20. The surface 35 is subjected to a pressure similar to that of the flow path 18. The differential pressure allows the valve body 30 to maintain its shape. The valve body 30 is less prone to vibration.

[0030] Since the valve body 30 is made of rubber, it is easily deformed by the fluid pressure. As shown in Figures 1 to 2(b), the protrusion 34 of the valve body 30 deforms into an umbrella shape, a nearly horizontal shape, and a wedge shape along the surface 22. The check valve 100 can be closed and opened.

[0031] <Second Embodiment> Figure 3 is a cross-sectional view illustrating a check valve 200 according to the second embodiment. The same configuration as in the first embodiment will not be described. The stopper 20 has a plurality of slits 27. The plurality of slits 27 are arranged radially in the XY plane. The slits 27 extend from the surface 22 in the Z-axis direction and function as fluid passages.

[0032] Figure 3 illustrates the closed state. The protrusion 34 of the valve body 30 hangs down in an umbrella shape. The fluid is blocked by the valve body 30 before it reaches the slit 27. Therefore, the fluid does not flow. When the protrusion 34 deforms upward, the tip 36 of the valve body 30 comes into contact with the surface 22 of the stopper 20. The slit 27 communicates with the flow path 16, and the fluid flows through the slit 27. That is, the check valve 100 opens. If the flow rate increases further, the protrusion 34 deforms into a wedge shape, and the surface 37 comes into contact with the surface 22.

[0033] According to the second embodiment, the slit 27 of the stopper 20 functions as a flow path. Because the surface 22 has a tapered shape, the valve body 30 deforms according to the fluid flow rate. This makes it possible to suppress the vibration of the protruding portion 34 of the valve body 30.

[0034] The check valve may have flow paths 18 and 19 between the housing 10 and the stopper 20, and may also have a slit 27.

[0035] Although preferred embodiments of the present invention have been described in detail above, the present invention is not limited to these specific embodiments, and various modifications and changes are possible within the scope of the gist of the present invention as described in the claims. [Explanation of symbols]

[0036] 10 Housing, 12, 14, 22, 24, 35, 37 Surface, 16, 18, 19 Flow path, 20 Stopper, 27 Slit, 30 Valve body, 32 Shaft, 34 Projection, 36 Tip, 100, 200 Check valve

Claims

1. A first member having a first surface, A second member having a second surface facing the first surface of the first member, A valve body provided between the first surface and the second surface, The valve body contacts the first surface, thereby blocking the fluid flow path. The valve body comes into contact with the second surface, thereby opening the flow path. The second surface has a tapered shape in the direction from the first member toward the second member. When the flow rate of the fluid is low, the tip of the valve body comes into contact with the second surface. When the flow rate of the fluid is high, the valve body of the check valve takes on a shape that conforms to the tapered shape of the second surface.

2. The check valve according to claim 1, wherein a fluid passage is formed between the first surface and the second surface.

3. The check valve according to claim 2, wherein the second member is provided with a hole that penetrates the second member in a direction toward the valve body from the second member.

4. The second member has a slit on the second surface, The check valve according to claim 1 or 2, wherein the slit functions as a fluid passage.

5. The check valve according to claim 1 or 2, wherein the valve body is made of rubber.

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