JP2022112581A - Check valve and valve device - Google Patents

Abstract

To provide a check valve and a valve device capable of securing a stable operation over a long period while securing a smooth flow of fluid.SOLUTION: A check valve 10 includes a hollow valve body 20 including a valve seat 22 and a passage 23, and a valve element 30 arranged in the passage of the valve body, the valve element having base parts 31, 40 abutting on the valve seat, a plurality of inlet side leg parts 32 extending from the base parts along an axial line, and a plurality of outlet side leg parts 33 extending from the base parts to an opposite side to the inlet side leg parts, respectively, the inlet side leg parts and the outlet side leg parts being slidable relative to an inner periphery of the valve body in the axial direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to check valves and valve devices.

2. Description of the Related Art Conventionally, check valves are used to control the flow direction of refrigerant (fluid) in refrigeration cycles used in air conditioning equipment such as car air conditioners.

Patent Document 1 discloses a disc-shaped portion as a pressure receiving portion that receives fluid pressure, a groove formed in the disc-shaped portion to hold a packing, and four protruding pieces extending from the disc-shaped portion. , a check valve having a valve body provided with a claw portion bent outward at the tip of each projecting piece. Such a check valve is used by being attached to a seal member accommodating portion within a pipe.

When the fluid flows in the pipe in the positive direction, the entire valve body moves in the positive direction according to the fluid flow, but the pawl portion of the valve body is engaged with the seal member accommodating portion and functions as a stopper to prevent the entire valve body from moving forward. stops moving. At this time, the fluid passes between the seal member accommodating portion and the disk-shaped portion and flows in the forward direction.

On the other hand, when the fluid tries to flow in the opposite direction in the piping, the entire valve body moves in the opposite direction according to the flow of the fluid, and the packing attached to the valve body comes into contact with the seal member accommodation section, thereby directional fluid flow can be blocked.

JP 2012-77894 A

In the check valve of Patent Document 1, the radial outer surfaces of the four protruding pieces extending from the disk-shaped portion are guided by the sealing member accommodating portion, thereby assisting the movement of the valve body. However, since the protruding piece extends only toward the upstream side, it is likely to incline due to the flow of the fluid. It may interfere with operation or accelerate wear of sliding parts.

Further, in the check valve of Patent Document 1, a claw portion is formed at the end of the protruding piece extending toward the upstream side, and the engagement of the claw portion prevents the valve body from coming out of the pipe. is doing. However, in order to engage the pawl with sufficient force, the protruding piece must be urged against the pipe with a strong force, which increases the frictional force between the protruding piece and the pipe, resulting in smooth operation. movement is hindered. In addition, there is a possibility that turbulent flow will occur on the upstream side of the valve body due to the contact of the fluid with the pawl, thereby hindering the smooth flow of the fluid.

SUMMARY OF THE INVENTION An object of the present invention is to provide a check valve and a valve device that can ensure stable operation over a long period of time while ensuring smooth fluid flow.

The check valve according to the present invention is
a hollow valve body with a seat and a passage;
a valve body arranged in the passage of the valve body,
The valve body includes a base that abuts against the valve seat, a plurality of inlet-side legs extending from the base along an axis, and a plurality of legs extending from the base in a direction opposite to the inlet-side legs. and a book exit leg,
The inlet leg and the outlet leg are axially slidable relative to the inner periphery of the valve 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 stable operation over a long period of time while ensuring smooth fluid flow.

FIG. 1 is an axial cross-sectional view of the check valve of this embodiment shown in a closed state. FIG. 2 is an axial cross-sectional view of the check valve of this embodiment shown in an open state. FIG. 3 is an assembled perspective view of the check valve showing a state in which the valve body is split in half 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 cross-sectional view showing an assembled state of the check valve of this embodiment. FIG. 6 is a cross-sectional view of a valve device in which a check valve is attached to a pipe joint.

BEST MODE FOR CARRYING OUT THE INVENTION 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 of this embodiment, showing a closed state. FIG. 2 is an axial cross-sectional view of the check valve 10 of this embodiment, showing an open state. FIG. 3 is an assembled perspective view of the check valve 10 showing the valve body 20 split in half along the axis. Here, let L be the axis of the fluid passage of the check valve 10 .

The check valve 10 includes a hollow valve body 20 having a refrigerant flow path (also referred to as a passage) through which the refrigerant passes, a valve body 30 arranged in the fluid passage of the valve body 20, and attached to the valve body 30. and an O-ring 40 that is

The check valve 10 is arranged at a joint to which refrigerant pipes connected to, for example, an evaporator and a compressor (not shown) are connected. Here, as the flow of the refrigerant is indicated by the arrows in FIG. 1, the left side of the check valve 10 is the inlet side of the refrigerant, and the right side thereof is the outlet side of the refrigerant.

The metal valve body 20 includes, from the inlet side in FIG. It has a cylindrical central passage 23 and a substantially cylindrical reduced diameter passage 24 formed on the outlet side of the central passage 23 . The valve body 20 may be made of resin instead of metal.

The valve body 20 is formed by connecting an inlet-side reduced-diameter cylindrical portion 25 and an outlet-side enlarged-diameter cylindrical portion 26 . The reduced-diameter cylindrical portion 25 has a first circumferential groove 27 and the large-diameter outer peripheral surface 26 has a second circumferential groove 28 . As will be described later with reference to FIG. 6, packings are provided in the circumferential grooves 27 and 28 to prevent refrigerant leakage between the check valve 10 and the joint when the check valve 10 is assembled to the joint of the pipe. placed.

The resin valve body 30 includes a disk portion 31 having a diameter smaller than that of the diameter-reduced passage 24, three inlet-side leg portions 32 extending from the disk portion 31 toward the inlet side in parallel along the axis L, and the disk portion 31 Three outlet-side leg portions 33 extending along the axis L are continuously provided from the outlet side. A ring groove 38 for holding an O-ring 40 is formed in the outer circumference of the disc portion 31 . The disk portion 31 and the O-ring 40 constitute a base portion.

A protrusion 34 is formed in the middle of the outer surface of each outlet-side leg 33 . The projecting portion 34 includes a slope 35 that separates 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 stepped portion 37 that intersects the parallel surface 36 . In a free state, in a cross section perpendicular to the axis L, the circumscribed circle diameter of the parallel surfaces 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 .

A radially outer surface 32a of the inlet-side leg portion 32 facing the inner periphery of the inlet-side passage 21 is part of a cylindrical surface having a diameter substantially the same as or slightly smaller than that of the inlet-side passage 21 . A radially outer surface 33a of the outlet-side leg portion 33 facing the inner periphery of the diameter-reduced passage 24 on the exit side of the protrusion 34 has a cylindrical surface with a diameter substantially equal to or slightly smaller than that of the diameter-reduced passage 24. part of it.

When the valve body 30 is installed in the valve main body 20 as shown in the figure, the inlet side leg portion 32 slides against the inner circumference of the inlet side passage 21, and the outlet side leg portion 33 slides along the reduced diameter passage 24. By sliding on the inner periphery, the valve body 30 is guided in the direction of the axis L and becomes movable.

FIG. 4 is an exploded perspective view showing a state before assembly of the check valve of the present embodiment. FIG. 5 is a cross-sectional view showing an assembled state of the check valve 10 of this embodiment. When assembling the valve body 30 to the valve body 20 , first, the O-ring 40 is attached to the ring groove 38 of the disk portion 31 . Next, the operator holds the valve body 20 with one hand, and pinches the tips of the outlet-side legs 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 30 is brought closer to the valve body 20 from the downstream side and passed through the diameter-reduced passage 24 while the inlet-side leg portion 32 and the disk portion 31 are moved toward the valve body. 20.

By bringing the tips of the outlet-side leg portions 33 closer to each other, the outlet-side leg portions 33 are elastically deformed so that the tips approach the axis L, as indicated by the dotted line in FIG. Therefore, in a cross section perpendicular to the axis L, the circumscribed circle diameter of the parallel surfaces 36 of the three protrusions 34 is smaller than the inner diameter of the diameter-reduced passage 24, so that the protrusion 34 passes through the inside of the diameter-reduced passage 24. to enter the valve body 20 . At this time, since the inclined surface 35 is formed on the inlet side of the protrusion 34, even if the protrusion 34 comes into contact with the diameter-reduced passage 24 during entry, the entry into the valve body 20 is not blocked and smooth. Contributes to efficient assembly.

After the protrusion 34 has entered the valve body 20 , the outlet-side leg 33 recovers from elastic deformation by releasing the finger from the outlet-side leg 33 . As a result, the stepped portion 37 of the projecting portion 34 faces the axially inner side surface 24 a of the diameter-reduced passage 24 . Therefore, when the valve body 30 is pressed toward the outlet side, the stepped portion 37 abuts against the axially inner side surface 24a of the diameter-reduced passage 24, thereby preventing the valve body 30 from slipping out of the valve body 20. be. As described above, the assembly of the check valve 10 is completed. The assembly of the check valve 10 is not limited to an operator, and may be performed by a robot.

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

The upstream pipe 60 has a main body 62 having a flow path 61 along the axis L, and a side portion 63 extending from an end of the main body 62 in a direction perpendicular to the axis L. As shown in FIG. A threaded hole 64 parallel to the axis L is formed in the end face of the side portion 63 . A small-diameter cylindrical surface 65 is formed at the end of the flow path 61 of the main body 62 .

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

When assembling the valve device 50 , first, the packing 81 is arranged in the first circumferential groove 27 of the check valve 10 and the packing 82 is arranged in the second circumferential 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 to allow the flow path 61 and the inlet-side passage 21 to communicate with each other. At this time, it is desirable that the upstream end of the check valve 10 does not contact the stepped portion between the small-diameter cylindrical surface 65 and the flow path 61 . The packing 81 seals between the diameter-reduced cylindrical portion 25 and the small-diameter cylindrical surface 65, thereby suppressing refrigerant leakage.

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

After that, after aligning the screw hole 64 of the side portion 63 with the through hole 74 of the side portion 73, the bolt 83 is inserted through the through hole 74 and screwed into the screw hole 64, thereby fastening the side portions 63, 73. can do As described above, the assembly of the valve device 50 is completed.

Here, it is preferable to make the axial length of the enlarged diameter cylindrical portion 26 slightly larger than the axial length of the large diameter cylindrical surface 75 . As a result, the upstream end surface of the enlarged diameter cylindrical portion 26 facing the axial direction abuts the end surface of the upstream pipe 60, and the downstream end surface of the enlarged diameter cylindrical portion 26 flows with the large diameter cylindrical surface 75 of the downstream pipe 70. It abuts on the stepped portion of the path 71 . Therefore, by bringing the side portions 63 and 73 closer together by tightening the bolt 83, the diameter-enlarged cylindrical portion 26 can be clamped without backlash 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 disc portion 31 is pushed by the pressure difference and the valve body 30 exits. side, and the O-ring 40 separates from the valve seat 22 . As a result, the refrigerant that has entered the inlet side passage 21 from the passage 61 flows through the gap between the O-ring 40 and the valve seat 22 into the central passage 23, and further through the reduced diameter passage 24 into the passage 71. and flow out. Therefore, a normal refrigerant flow 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 side pipe 70 becomes higher than the refrigerant pressure in the flow path 61 of the upstream side pipe 60, the disk portion 31 is pushed in the opposite direction by the pressure difference, Body 30 moves toward the inlet and O-ring 40 seats on valve seat 22 . As a result, the refrigerant in the central passage 23 cannot flow toward the inlet passage 21, thereby preventing the refrigerant from flowing back from the downstream pipe 70 to the upstream pipe 60. FIG.

According to this embodiment, when the valve body 30 moves within the valve main body 20, the inlet-side leg portion 32 slides against the inner circumference of the inlet-side passage 21, and the outlet-side leg portion 33 is reduced in diameter. It slides against the inner circumference of passageway 24 . Therefore, the valve body 30 can be guided over a relatively large span corresponding to the entire length of the valve body 20, thereby suppressing an increase in the size of the check valve 10 and allowing the valve body 30 inside the valve body 20 to move. Inclination can be suppressed, and strong stiffness and sliding contact between members can be suppressed to ensure smooth operation.

In addition, since the outlet-side leg portion 33 does not slide on the central passage 23 but slides only on the inner circumference of the diameter-reduced passage 24 whose thickness in the axial direction is smaller than that of the central passage 23, both Less resistance is created between them, ensuring smoother operation.

In addition, since the protrusion 34 is formed on the outlet leg 33, the flow resistance can be kept lower than when the protrusion 34 is provided on the inlet leg 32. A smooth flow of the refrigerant can be ensured.

It should be noted that the present invention is not limited to the above-described embodiments. Variations of any of the components of the above-described embodiments are possible within the scope of the invention. Also, arbitrary components can be added or omitted in the above-described embodiments. For example, the number of inlet-side legs and outlet-side legs may be two or four or more.

10 check valve 20 valve body 30 valve body 32 inlet side leg 33 outlet side leg 34 projection 40 O-ring L axis

Claims (6)

a hollow valve body with a seat and a passage;
a valve body arranged in the passage of the valve body,
The valve body includes a base that abuts against the valve seat, a plurality of inlet-side legs extending from the base along an axis, and a plurality of legs extending from the base in a direction opposite to the inlet-side legs. and a book exit leg,
the inlet leg and the outlet leg are axially slidable relative to an inner circumference of the valve body;
A check valve characterized by: A diameter-reduced passage is formed on the outlet side of the valve body, and a projection is formed on the radially outer surface of the outlet-side leg of the valve body, and the projection extends in the axial direction of the diameter-reduced passage. By contacting the inner surface, the valve body is prevented from being detached from the valve body.
The check valve according to claim 1, characterized in that: A slope is formed on the entrance side of the protrusion,
The check valve according to claim 2, characterized in that: the valve body includes a central passage between the valve seat and the reduced diameter passage;
the outlet leg does not slide against the inner circumference of the central passage;
4. The check valve according to claim 2 or 3, characterized in that: When the ends of the outlet-side leg portions are brought close to each other, the circumscribed circle diameter of the protrusion is smaller than the inner circumference circle diameter of the diameter-reduced passage when viewed in the axial direction of the valve body.
The check valve according to any one of claims 2 to 4, characterized in that: A check valve according to any one of claims 1 to 5, an upstream pipe provided with a small-diameter cylindrical surface, and a downstream pipe provided with a large-diameter cylindrical surface having a diameter larger than the small-diameter cylindrical surface. death,
A valve body of the check valve has a diameter-reduced cylindrical portion inserted into the small-diameter cylindrical surface and an enlarged-diameter cylindrical portion inserted into the large-diameter cylindrical surface,
A valve device characterized by:

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