CN114776849A

CN114776849A - Check valve and valve device

Info

Publication number: CN114776849A
Application number: CN202111609571.1A
Authority: CN
Inventors: 浅野恒; 坂本骏
Original assignee: Fujikoki Corp
Current assignee: Fujikoki Corp
Priority date: 2021-01-22
Filing date: 2021-12-27
Publication date: 2022-07-22
Also published as: JP2022112581A; JP7233117B2

Abstract

Provided are a check valve and a valve device which can ensure smooth fluid flow and can ensure stable operation for a long time. The check valve is provided with: a hollow valve body provided with a valve seat and a passage; and a valve body disposed in a passage of the valve body, the valve body having a base portion abutting against the valve seat, a plurality of inlet-side leg portions extending from the base portion along an axis, and a plurality of outlet-side leg portions extending from the base portion to a side opposite to the inlet-side leg portions, the inlet-side leg portions and the outlet-side leg portions being slidable in the axial direction with respect to an inner periphery of the valve body.

Description

Check valve and valve device

Technical Field

The present invention relates to a check valve and a valve device.

Background

Conventionally, in a refrigeration cycle used in an air conditioning apparatus such as an automobile air conditioner, a check valve is used to control a flow direction of a refrigerant (fluid).

Patent document 1 discloses a check valve having a valve body including a disc-shaped portion serving as a pressure receiving portion that receives fluid pressure, a groove portion formed in the disc-shaped portion and holding a packing, four projecting pieces extending from the disc-shaped portion, and a claw portion bent outward at the tip end of each projecting piece. The check valve is used by being attached to a seal member housing portion in a pipe.

When the fluid flows in the forward direction in the pipe, the entire valve body moves in the forward direction along with the fluid flow, but the claw portion of the valve body is engaged with the seal member housing portion and functions as a stopper, and the movement of the entire valve body is stopped. At this time, the fluid flows in the forward direction through between the sealing member housing portion and the disc portion.

On the other hand, when the fluid flows in the opposite direction in the pipe, the entire valve body moves in the opposite direction in accordance with the flow of the fluid, and the gasket attached to the valve body abuts against the seal member housing portion, whereby the flow of the fluid in the opposite direction can be prevented.

Documents of the prior art

Patent literature

Patent document 1: japanese patent laid-open publication No. 2012-77894

Technical problems to be solved by the invention

In the check valve of patent document 1, the movement of the valve body is supported by the radially outer surface of the four projecting pieces extending from the disc-shaped portion being guided by the seal member housing portion. However, since the projecting piece extends only toward the upstream side, it is easily inclined by receiving the flow of the fluid, and thus there is a concern that: strong interference, sliding contact, or the like occurs between the valve element and the seal member housing portion, and the valve element is prevented from operating or the sliding portion is accelerated from being worn.

In the check valve of patent document 1, a claw portion is formed at an end portion of a projecting piece extending toward the upstream side, and the valve body is prevented from coming out of the pipe by locking of the claw portion. However, in order to lock the pawl portion with a sufficient force, the projecting piece must exert a strong force on the tube, and as a result, the frictional force between the projecting piece and the tube increases, preventing smooth operation. Further, the fluid collides with the claw portion, and turbulence is generated on the upstream side of the valve body, which may hinder a smooth flow of the fluid.

Disclosure of Invention

The purpose of the present invention is to provide a check valve and a valve device that can ensure smooth fluid flow and can ensure stable operation over a long period of time.

Means for solving the problems

The check valve of the present invention includes:

a hollow valve body provided with a valve seat and a passage; and

a valve body disposed in the passage of the valve main body,

the valve body has a base portion abutting against the valve seat, a plurality of inlet-side leg portions extending from the base portion along an axis, and a plurality of outlet-side leg portions extending from the base portion to a side opposite to the inlet-side leg portions,

the inlet-side leg portion and the outlet-side leg portion are slidable in an axial direction with respect to an inner periphery of the valve main body.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, it is possible to provide a check valve and a valve device that can ensure smooth fluid flow and can ensure stable operation for a long period of time.

Drawings

Fig. 1 is an axial sectional view showing a check valve according to the present embodiment in a closed state.

Fig. 2 is an axial sectional view of the check valve of the present embodiment shown in an open state.

Fig. 3 is an assembled perspective view of the check valve shown in a state where the valve main body is half-sectioned along the axis.

Fig. 4 is an exploded perspective view showing a state before assembly of the check valve of the present embodiment.

Fig. 5 is a sectional view showing an assembled state of the check valve of the present embodiment.

Fig. 6 is a sectional view of a valve device in which a check valve is attached to a joint of a pipe.

Description of the symbols

10 check valve

20 valve body

30 valve core

32 entrance leg

33 outlet side foot

34 projecting part

40O-shaped ring

L axis

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Structure of check valve)

Fig. 1 is an axial cross-sectional view of a check valve 10 according to the present embodiment, showing a valve closed state. Fig. 2 is an axial sectional view of the check valve 10 of the present embodiment, showing an open state. Fig. 3 is an assembled perspective view of the check valve 10 shown in a state where the valve main body 20 is half-sectioned along the axis. Here, the axis of the fluid passage of the check valve 10 is denoted by L.

The check valve 10 has: a hollow valve body 20, the valve body 20 having a refrigerant flow path (also referred to as a passage) for passing a refrigerant therein; a valve body 30, the valve body 30 being disposed in the fluid passage of the valve body 20; and an O-ring 40, the O-ring 40 being attached to the valve core 30.

The check valve 10 is disposed at a joint connected to refrigerant piping connected to, for example, an evaporator and a compressor (not shown). Here, in fig. 1, the flow of the refrigerant is indicated by arrows, and the left side of the check valve 10 is the refrigerant inlet side and the right side is the refrigerant outlet side.

The valve body 20 made of metal includes, in order from the inlet side in fig. 1 along the axis L, a substantially cylindrical inlet-side passage 21, a conical valve seat 22 that expands in diameter from the inlet side toward the outlet side, a substantially cylindrical central passage 23, and a substantially cylindrical reduced-diameter passage 24 formed on the outlet side of the central passage 23. The valve main body 20 may be made of resin, in addition to metal.

The valve body 20 is formed by continuously providing a reduced diameter cylindrical portion 25 on the inlet side and an enlarged diameter cylindrical portion 26 on the outlet side. The reduced diameter cylindrical portion 25 includes a first peripheral groove 27, and the enlarged diameter cylindrical portion 26 includes a second peripheral groove 28. As described below with reference to fig. 6, the

peripheral grooves

27 and 28 are provided with gaskets that prevent leakage of the refrigerant between the check valve 10 and the joint when the check valve 10 is assembled to the joint of the pipe.

The valve element 30 made of resin is formed by connecting a disk portion 31 having a smaller diameter than the diameter-reduced passage 24, three inlet leg portions 32 extending in parallel along the axis L from the disk portion 31 to the inlet side, and three outlet leg portions 33 extending along the axis L from the disk portion 31 to the outlet side. An annular groove 38 for holding an O-ring 40 is formed on the outer periphery of the disk portion 31. The disk portion 31 and the O-ring 40 constitute a base portion.

A projection 34 is formed in the middle of the outer surface of each outlet leg 33. The projection 34 includes a slope 35 that is distant from the axis L from the inlet side toward the outlet side, a parallel surface 36 that is substantially parallel to the axis L, and a step 37 that intersects the parallel surface 36. In a free state, in a cross section orthogonal to the axis L, the circumscribed circle diameter of the parallel surface 36 of the three protrusions 34 is larger than the inner diameter of the reduced diameter passage 24, but smaller than the inner diameter of the central passage 23.

The radially outer side surface 32a of the inlet leg 32 facing the inner periphery of the inlet passage 21 forms a part of a cylindrical surface having substantially the same diameter as or a slightly smaller diameter than the inlet passage 21. The radially outer surface 33a of the outlet-side leg 33, which is located on the outlet side of the projection 34 and faces the inner periphery of the reduced diameter passage 24, constitutes a part of a cylindrical surface having substantially the same diameter as or a slightly smaller diameter than the reduced diameter passage 24.

As shown in the drawing, when the valve body 30 is provided in the valve body 20, the inlet leg portion 32 slides on the inner periphery of the inlet passage 21, and the outlet leg portion 33 slides on the inner periphery of the reduced diameter passage 24, whereby the valve body 30 is guided and movable in the axis L direction.

Fig. 4 is an exploded perspective view showing a state before assembly of the check valve of the present embodiment. Fig. 5 is a sectional view showing an assembled state of the check valve 10 of the present embodiment. When the valve body 20 is assembled with the valve body 30, first, the O-ring 40 is attached to the ring groove 38 of the disk portion 31. Next, the operator holds the valve main body 20 with one hand, and pinches the tips of the outlet-side feet 33 with the fingers of the other hand to bring them close to each other. From this state, as shown in fig. 4, the valve body 20 is approached by the valve body 30 from the downstream side, and the inlet leg portion 32 and the disk portion 31 are inserted into the valve body 20 by passing the valve body 30 through the inside of the reduced diameter passage 24.

As the distal ends of the outlet-side legs 33 are brought close to each other, the outlet-side legs 33 are elastically deformed so that the distal ends thereof approach the axis L, as shown by the broken line in fig. 5. Therefore, in the cross section orthogonal to the axis L, the circumscribed diameter of the parallel surfaces 36 of the three protrusions 34 is smaller than the inner diameter of the reduced diameter passage 24, so that the protrusions 34 can enter the valve main body 20 through the inside of the reduced diameter passage 24. At this time, since the inclined surface 35 is formed on the inlet side of the projection 34, even if the projection 34 abuts against the reduced diameter passage 24 at the time of entry, entry of the projection 34 into the valve main body 20 is not prevented, and smooth assembly is facilitated.

After the projection 34 enters the valve main body 20, the outlet-side leg 33 is restored from elastic deformation by releasing a finger from the outlet-side leg 33. Thereby, the step portion 37 of the protrusion 34 faces the axial inner surface 24a of the reduced diameter passage 24. Therefore, when the valve body 30 is pressed toward the outlet side, the stepped portion 37 abuts against the axial inner surface 24a of the reduced diameter passage 24, thereby preventing the valve body 20 from coming off the valve body 30. The check valve 10 is assembled as described above. The check valve 10 may be assembled by a robot, not by an operator.

Fig. 6 is a sectional view of a valve device 50 in which the check valve 10 is attached to a joint of a pipe. In fig. 6, the valve device 50 is composed of an upstream pipe 60, a downstream pipe 70, and a check valve 10 disposed between the upstream pipe 60 and the downstream pipe 70.

The upstream pipe 60 includes: a body 62, the body 62 having a flow path 61 along an axis L; and a side portion 63, the side portion 63 extending from an end of the main body 62 in a direction orthogonal to the axis L. A screw hole 64 parallel to the axis L is formed in an end surface of the side portion 63. Further, a small-diameter cylindrical surface 65 is formed at an end of the flow path 61 of the body 62.

The downstream pipe 70 includes: a body 72 having a flow path 71 along an axis L; and a side portion 73, the side portion 73 extending from an end portion of the main body 72 in a direction orthogonal to the axis L. A through hole 74 parallel to the axis L is formed in an end surface of the side portion 73. Further, a large-diameter cylindrical surface 75 having a larger diameter than the small-diameter cylindrical surface 65 is formed at an end of the flow path 71 of the body 72.

When assembling the valve device 50, the packing 81 is first disposed in the first peripheral groove 27 of the check valve 10, and the packing 82 is disposed in the second peripheral groove 28. In this state, the reduced diameter cylindrical portion 25 of the check valve 10 is inserted into the small diameter cylindrical surface 65 of the upstream pipe 60, and the flow path 61 is communicated with the inlet-side passage 21. At this time, it is preferable that the upstream end of the check valve 10 does not abut against the small-diameter cylindrical surface 65 and the step portion of the flow path 61. The packing 81 seals between the reduced diameter cylindrical portion 25 and the small diameter cylindrical surface 65, thereby suppressing leakage of the refrigerant.

Next, the downstream pipe 70 is brought close to the diameter-enlarged cylindrical portion 26 of the check valve 10 protruding from the upstream pipe 60, and the diameter-enlarged cylindrical portion 26 is inserted into the large-diameter cylindrical surface 75, so that the flow path 71 communicates with the diameter-reduced passage 24. At this time, the gasket 82 seals between the enlarged diameter cylindrical portion 26 and the large diameter cylindrical surface 75, thereby suppressing leakage of the refrigerant.

Subsequently, after the screw holes 64 of the side portions 63 and the through holes 74 of the side portions 73 are aligned, the bolts 83 are inserted through the through holes 74, and the bolts 83 are screwed into the screw holes 64 to fasten the

side portions

63, 73. The assembly of the valve device 50 is completed as described above.

Here, it is preferable that the axial length of the enlarged diameter cylindrical portion 26 is slightly larger than the axial length of the large diameter cylindrical surface 75. Accordingly, the upstream end surface of the diameter-enlarged cylindrical portion 26 facing the axial direction comes into contact with the end surface of the upstream pipe 60, and the downstream end surface of the diameter-enlarged cylindrical portion 26 and the large-diameter cylindrical surface 75 of the downstream pipe 70 come into contact with the step portion of the flow path 71. Therefore, the

side portions

63 and 73 are brought close to each other by tightening the bolt 83, and the enlarged diameter cylindrical portion 26 can be held without play in the axial direction.

Next, the operation of the valve device 50 including the check valve 10 will be described. In fig. 6, when the refrigerant pressure in the flow path 61 of the upstream pipe 60 is lower than the refrigerant pressure in the flow path 71 of the downstream pipe 70, the pressure difference presses the disk portion 31, and the valve body 30 moves toward the outlet side, and the O-ring 40 separates from the valve seat 22. Thus, the refrigerant having entered the inlet-side passage 21 from the flow passage 61 flows through the gap between the O-ring 40 and the valve seat 22 into the central passage 23, and further flows out through the reduced-diameter passage 24 into the flow passage 71. Therefore, a normal flow of the refrigerant from the upstream pipe 60 to the downstream pipe 70 is ensured.

On the other hand, when the refrigerant pressure in the flow path 71 of the downstream pipe 70 is higher than the refrigerant pressure in the flow path 61 of the upstream pipe 60, the pressure difference presses the disk part 31 in the opposite direction, so that the valve body 30 moves toward the inlet side, and the O-ring 40 is seated on the valve seat 22. As a result, the refrigerant in the center passage 23 cannot flow toward the inlet-side passage 21, and the refrigerant is prevented from flowing back from the downstream pipe 70 to the upstream pipe 60.

According to the present embodiment, when the valve body 30 moves in the valve main body 20, the inlet side leg portion 32 slides with respect to the inner periphery of the inlet side passage 21, and the outlet side leg portion 33 slides with respect to the inner periphery of the reduced diameter passage 24. Therefore, the valve body 30 can be guided over a wide span corresponding to the entire length of the valve body 20, so that the valve body 30 can be prevented from being inclined inside the valve body 20 while suppressing an increase in size of the check valve 10, and smooth operation can be ensured while suppressing strong interference between members, sliding contact, and the like.

Further, since the outlet-side leg portion 33 does not slide with respect to the central passage 23 but slides only with respect to the inner periphery of the reduced diameter passage 24 having a smaller thickness in the axial direction than the central passage 23, resistance generated therebetween is small, and smooth operation can be further ensured.

Further, since the projection 34 is formed on the outlet-side leg 33, the flow resistance can be suppressed to be lower than that in the case where the projection 34 is provided on the inlet-side leg 32, and thus a smooth flow of the refrigerant can be ensured when the valve is opened.

The present invention is not limited to the above-described embodiments, and any constituent elements of the above-described embodiments may be modified within the scope of the present invention. In the above-described embodiment, any component can be added or omitted. For example, the number of the inlet-side leg portions and the outlet-side leg portions may be two or four or more.

Claims

1. A check valve is characterized by comprising:

a hollow valve body provided with a valve seat and a passage; and

a valve body disposed in the passage of the valve main body,

2. The check valve of claim 1,

a reduced diameter passage is formed on an outlet side of the valve body, a projection is formed on a radially outer surface of the outlet side leg of the valve body, and the valve body is prevented from being detached from the valve body by the projection abutting against an axially inner surface of the reduced diameter passage.

3. The check valve of claim 2,

an inclined surface is formed on the inlet side of the protrusion.

4. The check valve of claim 2 or 3,

the valve body is provided with a central passage between the valve seat and the reduced diameter passage,

the outlet leg does not slide with respect to the inner periphery of the central passage.

5. The check valve of any one of claims 2 to 4,

when the end portions of the outlet-side leg portions are brought close to each other, the diameter of the circumscribed circle of the projection portion is smaller than the diameter of the inner circumference of the reduced diameter passage as viewed in the axial direction of the valve main body.

6. A valve device, characterized in that,

the disclosed device is provided with: the check valve of any one of claims 1 to 5; an upstream pipe having a small-diameter cylindrical surface; and a downstream pipe having a large-diameter cylindrical surface with a larger diameter than the small-diameter cylindrical surface,

the check valve body includes a reduced diameter cylindrical portion inserted into the small diameter cylindrical surface and an enlarged diameter cylindrical portion inserted into the large diameter cylindrical surface.