JP2019027439A - Check valve - Google Patents

Abstract

To achieve simplification of a structure of a check valve and a manufacturing process.SOLUTION: A check valve 1 includes: a body 2 having a valve seat 22 in a flow passage 10; a valve body 4 for opening/closing the flow passage 10 by being attached to/detached from the valve seat 22 from a secondary side; and a locking ring 26 fitted in the body 2 further on the secondary side than the valve seat 22. The locking ring 26 includes: a locking part which can lock the valve body 4 from the secondary side; and a guide part integrally provided with the locking part. The valve body 4 includes: a body 40 having an attachment/detachment part attached to/detached from the valve seat 22, and locked to the locking part on the opposite side from the attachment/detachment part; a first slide part 34 extending from the body 40 and supported by an inner peripheral part of the body 2; and a second slide part 36 extending from the body 40 and supported by the guide part. The locking ring 26 is an elastic body which can be reduced in the radial direction by having a discontinuous portion at one part, and has a shape in which neither the locking part nor the guide part interferes with the reduction deformation, in an insertion state in the flow passage 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a check valve that regulates the flow of fluid in one direction from a primary side to a secondary side.

  A device that controls the flow of fluid from the primary side to the secondary side is provided with a check valve that prevents backflow of the fluid. As such a check valve, there is one that forms a valve chamber at the center of the body, accommodates the valve body, and supports it in the axial direction (see, for example, Patent Document 1). A valve seat is formed on the primary side of the valve chamber in the body, and a valve body stopper is disposed on the secondary side of the valve chamber. The valve body stopper has a flow hole, allows fluid flow, and restricts axial displacement of the valve body. The valve body stopper is inserted from the secondary side opening (outlet) of the body and then fixed by a support ring that is inserted into the body.

  The valve body includes a main body that can move in the axial direction in the valve chamber, a guide bar that protrudes from the main body to the primary side and is supported on the inner peripheral surface of the body, and a flow hole in the valve body stopper that protrudes from the main body to the secondary side. The guide bar is supported by the inner peripheral surface of the. The valve body can be attached to and detached from the valve seat by opening and closing the flow path by sliding the guide bars at both ends in the axial direction.

JP 2010-185464 A

  Such a check valve is obtained through a simple process of sequentially inserting and assembling a valve body, a valve body stopper, and a support ring to the body, and can be realized at a relatively low cost. However, since the design concept is that the valve body is supported by the valve body stopper, a support ring is required as the fixing means. The inventors have focused on this point and have come to the realization that there is room for improvement toward further simplification of the check valve structure and manufacturing process.

  The present invention has been made in view of such problems, and one of its purposes is to realize the structure of the check valve and the simplification of the manufacturing process.

  One aspect of the present invention is a check valve that regulates the flow of fluid in one direction from the primary side to the secondary side. The check valve is disposed in the flow path, a body having an introduction port for introducing a fluid, a discharge port for discharging the fluid, and a valve seat formed in a flow path connecting the introduction port and the discharge port. A valve body that opens and closes the flow path by attaching to and detaching from the secondary side of the valve seat, and a member that is fitted to the body on the secondary side of the valve seat in the flow path and forms a valve chamber between the valve seat and the valve seat A stop ring.

  The locking ring includes a locking portion that can lock the valve body from the secondary side, and a guide portion that is provided integrally with the locking portion. The valve body is disposed in the valve chamber and has a detachable portion that is detachably attached to the valve seat, a main body that is locked to the locking portion on the side opposite to the detachable portion, and a body that extends from the main body to the primary side. The 1st sliding part supported by the inner peripheral part of this, and the 2nd sliding part extended from the main body to the secondary side and supported by the guide part are included. The locking ring is an elastic body that can be reduced in the radial direction by having a discontinuous part in a part, and has a shape in which neither the locking part nor the guide part interferes with the reduction deformation when inserted into the flow path. Have.

  According to this aspect, when the locking portion and the guide portion are integrally formed as the locking ring, the locking portion and the guide portion do not interfere with the reduction deformation of the locking ring during insertion into the body. Is adopted. That is, the number of parts can be reduced by integrally forming the locking portion and the guide portion, and both can be simultaneously assembled to the body in the form of a locking ring. Thereby, the structure of the check valve and the simplification of the manufacturing process can be realized.

  According to the present invention, the structure of the check valve and the simplification of the manufacturing process can be realized.

It is a figure showing the structure of the non-return valve which concerns on 1st Embodiment. It is a figure showing the structure of a valve body. It is a figure showing the structure of a latching ring. It is a figure showing the assembly | attachment method to the body of a valve body and a locking ring. It is a figure showing the structure of the non-return valve which concerns on 2nd Embodiment. It is a figure showing the structure of a valve body. It is a figure showing the structure of a latching ring.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, for the sake of convenience, the positional relationship between the structures may be expressed based on the illustrated state. In the following embodiments and modifications thereof, substantially the same components are denoted by the same reference numerals, and the description thereof may be omitted as appropriate.

[First Embodiment]
FIG. 1 is a diagram illustrating the structure of a check valve according to the first embodiment. (A) is a longitudinal cross-sectional view, (B) is an A direction arrow view of (A), and (C) is an A direction arrow view of (A). Hereinafter, on the basis of the original flow direction of the fluid, the upstream side of the check valve is also referred to as “primary side” and the downstream side is also referred to as “secondary side”. The upstream pressure of the check valve is also called “primary pressure”, and the downstream pressure is also called “secondary pressure”. The check valve of this embodiment is applied to the refrigeration cycle of an automotive air conditioner.

  As shown in FIG. 1A, the check valve 1 is configured by accommodating a valve body 4 in a tubular body 2. The body 2 is obtained by processing a metal material such as an aluminum alloy and has a linear flow path 10. A fluid introduction port 12 is provided at one end of the flow path 10, and a lead-out port 14 is provided at the other end. The body 2 has a first pipe connection part 16 on one end side and a second pipe connection part 18 on the other end side. The 1st piping connection part 16 is connected to a primary side external piping (not shown), and the 2nd piping connection part 18 is connected to a secondary side external piping (not shown).

  An annular valve seat 22 is formed by partially reducing the inner diameter of the body 2, and the inner peripheral portion of the reduced portion forms the valve hole 20. The valve seat 22 is located at the secondary opening end of the valve hole 20. The body 2 is also provided with an annular groove 24 at a position spaced from the valve seat 22 to the secondary side, and a locking ring 26 is fitted thereto. A valve chamber 28 is formed between the valve seat 22 and the locking ring 26. The valve body 4 is disposed in the valve chamber 28, and both ends thereof are slidably supported by the valve hole 20 and the locking ring 26, respectively. That is, the valve chamber 28 defines a substantial movable range of the valve body 4.

  An O-ring 30 (functioning as “seal member” and “valve member”) is fitted to the outer peripheral surface of the valve body 4. When the O-ring 30 is attached to and detached from the valve seat 22, the valve portion is opened and closed. A spring 32 (which functions as a “biasing member”) that biases the valve body 4 in the valve closing direction is interposed between the valve body 4 and the locking ring 26. Due to the load of the spring 32, a differential pressure between the primary pressure and the secondary pressure when the check valve 1 opens (hereinafter also referred to as “valve opening differential pressure”) is set.

  As shown in FIG. 1B, three leg portions 34 extend from the peripheral edge portion of the primary side end face of the valve body 4 and are slidably inserted into the valve hole 20. These leg portions 34 function as “first sliding portions”. On the other hand, as shown in FIG. 1C, three leg portions 36 extend from the central portion of the secondary side end face of the valve body 4 and are slidably inserted into the locking ring 26. These leg portions 36 function as “second sliding portions”. Details of the valve body 4 and the locking ring 26 will be described later.

FIG. 2 is a diagram illustrating the structure of the valve body 4. (A) is a side view, (B) is a front view, and (C) is a rear view.
As shown in FIGS. 2A and 2B, the valve body 4 is obtained by integral molding (injection molding) of a resin material, and includes a stepped disk-shaped main body 40 and an axial direction from the front of the main body 40. It has three legs 34 that extend. An annular fitting recess 42 is provided around the center of the main body 40 in the axial direction, and an O-ring 30 is fitted therein. The three legs 34 are arranged at equal intervals along the peripheral edge of the main body 40, and the radius of curvature of the outer peripheral surface thereof is substantially equal to the radius of curvature of the valve hole 20. Accordingly, the three legs 34 are slidably supported by the valve hole 20.

  As shown in FIGS. 2A and 2C, the valve body 4 also has three legs 36 extending in the axial direction from the back surface of the main body 40. A base 44 having a Y-shaped cross section projects from the center of the back surface of the main body 40, and leg portions 36 extend from three vertices of the base 44. The leg portion 36 has a pentagonal cross section, and one apex thereof is configured to face the axis L of the valve body 4.

FIG. 3 is a diagram illustrating the structure of the locking ring 26. (A) shows a no-load state, and (B) shows a load state.
As shown in FIG. 3A, the locking ring 26 is an elastic body made of a spring steel plate (stainless steel or the like), and has an annular portion 50 fitted in the annular groove 24, and a radial direction from the inner periphery of the annular portion 50. Three extending portions 52 extending inward are provided. The annular portion 50 has the same structure as a so-called snap ring (C ring), and has a notch (discontinuous portion) in a part in the circumferential direction. The locking ring 26 is obtained by punching a spring steel plate with a press. The annular portion 50 and the extending portion 52 are integrally formed (integrated molding) by punching.

  Tool insertion holes 54 are respectively provided at the two peripheral ends of the annular portion 50. As shown in FIG. 3 (B), the tip of a predetermined tool is inserted into the pair of tool insertion holes 54 and an external force is applied so that the two peripheral ends are brought close to each other (refer to a two-dot chain line arrow). The stop ring 26 can be reduced in the radial direction. Thereby, the locking ring 26 can be inserted into the flow path 10 of the body 2. That is, in the no-load state shown in FIG. 3A, the outer diameter of the locking ring 26 is larger than the inner diameter of the flow path 10, but in the loaded state shown in FIG. The diameter is smaller than the inner diameter of the flow path 10 and can be inserted.

  The three extending parts 52 are arranged at substantially equal intervals along the inner peripheral edge of the annular part 50, and they are arranged in a Y shape. Even if an external force is applied to insert the locking ring 26 into the flow path 10, the three extending portions 52 do not interfere with each other, and the triangular gap S is maintained so as to be surrounded by each tip. . A fan-shaped flow hole 56 for allowing fluid to pass therethrough is formed between adjacent extending portions 52. The three extending portions 52 function as “locking portions” that can lock the valve body 4 from the secondary side, and also function as “guide portions” that support the three leg portions 36 slidably ( (See FIG. 1C). The “guide portion” is located approximately at the center of the locking ring 26.

  FIG. 4 is a diagram illustrating a method of assembling the valve body 4 and the locking ring 26 to the body 2. (A) shows the state before insertion of the locking ring 26 into the flow path 10, (B) shows the state of the insertion process, and (C) shows the state after insertion. (D) is CC sectional view taken on the line of FIG. 1 (A).

  When the valve body 4 is assembled to the body 2, the valve body 4, the spring 32, and the locking ring 26 are sequentially inserted into the flow path 10 as shown in FIG. As shown in FIG. 4B, when the locking ring 26 is inserted, the outer diameter of the annular portion 50 is reduced using a tool such as pliers so as to be accommodated in the flow path 10. At this time, the locking ring 26 is inserted in such a manner that the tip portions of the three extending portions 52 are inserted into the triangular region surrounded by the three leg portions 36. As shown in FIGS. 4C and 4D, when the locking ring 26 reaches the annular groove 24, the external force by the tool is released, so that the shape of the annular portion 50 is elastically restored, and the elastic reaction force thereof. Thus, the annular groove 24 is securely fitted.

Next, the operation of the check valve 1 will be described with reference to FIG.
When the primary pressure is greater than the secondary pressure and the differential pressure is greater than the above-described valve opening differential pressure, the valve body 4 separates from the valve seat 22 against the biasing force of the spring 32, that is, the check valve 1 Is opened, and the flow path 10 is opened. At this time, the fluid introduced from the primary side via the introduction port 12 passes through the valve portion and the flow hole 56 and is led out to the secondary side via the lead-out port 14. The displacement of the valve body 4 in the valve opening direction (secondary side) is regulated by the base 44 being locked by the locking ring 26.

  When the differential pressure between the primary pressure and the secondary pressure becomes smaller than the valve opening differential pressure, or when the secondary pressure becomes higher than the primary pressure, the valve body 4 is seated on the valve seat 22. That is, the check valve 1 is closed and the flow path 10 is blocked. Thereby, the back flow of the fluid is prevented. In such an opening / closing operation of the check valve 1, the three legs 34 are guided to the body 2 (valve hole 20) on the primary side, and the three legs 36 are guided to the locking ring 26 on the secondary side. . Thereby, the stable operation | movement which prevented or suppressed the axial deflection of the valve body 4 is ensured.

  As described above, according to this embodiment, the locking portion and the guide portion are integrally formed as the locking ring 26. None of the guides interfere. For this reason, when the locking ring 26 is assembled to the body 2, it can be inserted without any problem in a state of being contracted in the radial direction. That is, the number of parts can be reduced by integrally forming the locking portion and the guide portion, and both can be simultaneously assembled to the body 2 in the form of the locking ring 26. Thereby, simplification of the structure and manufacturing process of the check valve 1 can be realized.

[Second Embodiment]
FIG. 5 is a diagram illustrating the structure of a check valve according to the second embodiment. (A) is a longitudinal cross-sectional view, (B) is an A direction arrow view of (A), and (C) is an A direction arrow view of (A). Below, it demonstrates centering on difference with 1st Embodiment.

  As shown in FIGS. 5A and 5B, the check valve 201 is configured by assembling a valve body 204 and a locking ring 226 to the body 2. As shown in FIG. 5C, a shaft portion 236 extends from the center of the secondary side end face of the valve body 204 and is slidably inserted into the locking ring 226. The shaft portion 236 functions as a “second sliding portion”. Details of the valve body 204 and the locking ring 226 will be described later.

FIG. 6 is a diagram illustrating the structure of the valve body 204. (A) is a side view, (B) is a front view, and (C) is a rear view.
As shown in FIGS. 6A to 6C, in the valve body 204, a base 244 having a circular cross section projects from the center of the back surface of the main body 40, and further extends in the axial direction from the center of the base 244. A shaft portion 236 is provided. The shaft portion 236 has a semicircular cross section in which one side surface is cut flat by a so-called D cut.

FIG. 7 is a diagram illustrating the structure of the locking ring 226. (A) shows a no-load state, and (B) shows a load state.
As shown in FIG. 7A, the locking ring 226 has one extending portion 252 that extends radially inward from the inner periphery of the annular portion 50. A distal end portion 238 of the extending portion 252 is formed in a disc shape, and an insertion hole 240 complementary to the shaft portion 236 (semicircular shape) is provided at the center thereof. The distal end portion 238 is located approximately at the center of the locking ring 226. Since the shaft portion 236 is inserted into the insertion hole 240, the rotation of the valve body 4 is prevented.

  With such a configuration, as shown in FIG. 7B, even when an external force is applied to insert the locking ring 226 into the flow path 10, the annular portion 50 does not interfere with the extending portion 252. . A circulation hole 256 for allowing fluid to pass therethrough is formed around the extending portion 252. The extending portion 252 functions as a “locking portion” that can lock the valve body 204 from the secondary side, and also functions as a “guide portion” that slidably supports the shaft portion 236 (FIG. 5C )reference).

  Also in this embodiment, when the locking ring 226 is assembled to the body 2, the number of parts can be reduced by integrally forming the locking portion and the guide portion, which can be inserted without any problem in a radially reduced state. it can. That is, the same effect as the first embodiment can be obtained.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments, and various modifications can be made within the scope of the technical idea of the present invention. Nor.

  In the above embodiment, the locking ring is made of a metal material, but may be obtained by integral molding of a resin material. However, the locking ring is assumed to have elasticity in the radial direction.

  In the said embodiment, the structure which fits the O-ring 30 in the main body 40 of the valve body was illustrated. The O-ring 30 functionally constitutes a part of the main body 40. In the modification, the O-ring 30 may be omitted, and the main body 40 may be directly attached to and detached from the valve seat 22.

  In the above embodiment, the check valve having the above structure is applied to the refrigeration cycle of the automotive air conditioner, but may be applied to the refrigeration cycle of the residential air conditioner. Or you may apply to the fluid circulation circuit of the water circuit of other hot-water supply apparatuses, or other apparatuses. In that case, the body and the valve body may be obtained by integral molding (injection molding) of a resin material instead of a metal material.

  In addition, this invention is not limited to the said embodiment and modification, A component can be deform | transformed and embodied in the range which does not deviate from a summary. Various inventions may be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments and modifications. Moreover, you may delete some components from all the components shown by the said embodiment and modification.

1 check valve, 2 body, 4 valve body, 10 flow path, 12 inlet port, 14 outlet port, 20 valve hole, 22 valve seat, 24 annular groove, 26 locking ring, 28 valve chamber, 30 O-ring, 32 Spring, 34 legs, 36 legs, 40 body, 44 base, 50 annular part, 52 extension part, 54 tool insertion hole, 56 flow hole, 201 check valve, 204 valve body, 226 locking ring, 236 shaft Part, 240 insertion hole, 244 base, 252 extension part, 256 flow hole.

Claims (2)

In a check valve that regulates the flow of fluid in one direction from the primary side to the secondary side,
A body having an introduction port for introducing a fluid, a derivation port for deriving a fluid, and a valve seat formed in a flow path connecting the introduction port and the derivation port;
A valve body that is disposed in the flow path and opens and closes the flow path by being attached to and detached from the valve seat from the secondary side;
A locking ring that is fitted to the body on the secondary side of the valve seat in the flow path and forms a valve chamber with the valve seat;
With
The locking ring is
A locking part capable of locking the valve body from the secondary side;
A guide portion provided integrally with the locking portion;
Including
The valve body is
A main body that is disposed in the valve chamber and has a detachable portion that is attached to and detached from the valve seat, and is locked to the locking portion on a side opposite to the detachable portion;
A first sliding portion extending from the main body to the primary side and supported by an inner peripheral portion of the body;
A second sliding portion extending from the main body to the secondary side and supported by the guide portion;
Including
The locking ring is an elastic body that can be reduced in the radial direction by having a discontinuous part in a part, and both the locking part and the guide part are reduced in deformation when inserted into the flow path. A check valve having a shape that does not interfere. The locking portion is composed of a portion extending radially inward from the annular portion of the locking ring,
The check valve according to claim 1, wherein the guide portion is located substantially in the center of the locking ring.

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