JP7361946B2 - non-return valve - Google Patents

Description

The present disclosure relates to a check valve attached to a refrigerant pipe of a refrigeration cycle of an air conditioner.

BACKGROUND ART Conventionally, refrigerant piping of a refrigeration cycle in an air conditioner is sometimes provided with a check valve to prevent backflow of refrigerant and the like. In the check valve, a valve body provided inside the check valve operates to prevent backflow of fluid due to back pressure of a fluid such as a refrigerant passing through the check valve.

For example, Patent Document 1 discloses a valve body having a valve seat portion, a valve body having a valve portion slidably disposed inside the valve body and closing the valve seat portion, and a valve opening operation of the valve body. A check valve is disclosed that includes a restriction pin that restricts the limit of the check valve. In this check valve, when the valve body is opened, the valve body comes into line contact with the regulation pin, so that the limit of the valve opening operation of the valve body is regulated by the regulation pin, and the engaging means moves the valve body around the valve body. A stop is made.

Patent No. 3395731

However, the check valve described in Patent Document 1 has a problem in that a pressure loss occurs because the regulating pin that regulates the valve opening operating limit of the valve body is disposed in a flow path through which fluid flows. In addition, when the valve body opens, the valve body comes into line contact with the regulation pin, but since the contact area between the valve body and the regulation pin at this time is small, the impact force applied to the regulation pin becomes excessive, and the regulation pin There is a risk that problems such as rattling and coming off may occur.

The present disclosure has been made in view of the problems in the conventional technology described above, and is capable of suppressing pressure loss when fluid passes through it and ensuring the strength of the regulating means when the valve body opens. The purpose is to provide check valves.

The check valve of the present disclosure includes a valve body formed in a cylindrical shape, and a valve body provided in the valve body and movable in the axial direction of the valve body, wherein the valve body is formed in a cylindrical shape. and has an accommodating part for accommodating the valve body, an inflow part formed at one end into which the fluid flows, and an outflow part formed at the other end from which the fluid flows out, and the accommodating part has a accommodating part in which the fluid flows out. a guide member having a guide part that guides the valve body; a bent part formed by bending the inflow side of the guide part inward and functioning as a valve seat; and a guide member formed separately from the guide member. In addition, a valve body stopping member is formed in a cylindrical shape on the outflow side of the guide member and restricts movement of the valve body toward the outflow side.

As described above, according to the present disclosure, the valve body stopper member that restricts the movement of the valve body toward the outflow portion side is formed in a cylindrical shape. This prevents the flow of fluid passing through the check valve from being obstructed, thereby suppressing pressure loss when fluid passes. Further, since the valve body makes surface contact with the valve body stop member when the valve is opened, the strength of the regulating means when the valve body is opened can be ensured.

1 is a perspective view showing an example of the appearance of a check valve according to Embodiment 1. FIG. FIG. 2 is a schematic cross-sectional view showing an example of the internal structure of the check valve shown in FIG. 1. FIG. FIG. 3 is a schematic diagram showing an enlarged view of the lower part of the guide member shown in FIG. 2; FIG. 3 is a schematic diagram showing an enlarged view of the upper part of the guide member shown in FIG. 2; 3 is a perspective view showing an example of the configuration of the valve body of FIG. 2. FIG. FIG. 3 is a schematic cross-sectional view showing an example of an internal structure of a check valve according to a second embodiment. FIG. 7 is a schematic diagram showing an enlarged view of the periphery of the valve body stopper member shown in FIG. 6; It is a schematic sectional view showing an example of the internal structure of a check valve when a guide member and a valve body stopping member are formed integrally.

Embodiments of the present disclosure will be described below with reference to the drawings. The present disclosure is not limited to the following embodiments, and can be variously modified without departing from the gist of the present disclosure. Further, the present disclosure includes all combinations of configurations that can be combined among the configurations shown in the following embodiments. Furthermore, the shape, size, arrangement, etc. of the configurations shown in each figure can be changed as appropriate within the scope of the present disclosure.

In addition, in the following description, terms indicating directions (for example, "top", "bottom", "right", "left", "front", and "back") are used as appropriate to facilitate understanding. These terms are for purposes of explanation and do not limit this disclosure. In the embodiment described below, "upper", "lower", "right", "left", "front", "rear", etc. are used when the installation plate is viewed from the front. Note that in each drawing, the relative dimensional relationship or shape of each component may differ from the actual one.

Embodiment 1.
The check valve according to the first embodiment will be described below. The check valve according to the first embodiment is arranged, for example, in the piping of an air conditioner, and prevents the backflow of fluid such as refrigerant and restricts the fluid to flow in only one direction. Specifically, in the check valve, an internal valve body opens when fluid flows in from one end. Moreover, when fluid flows in from the other end, the valve body closes.

[Configuration of check valve 1]
FIG. 1 is a perspective view showing an example of the appearance of the check valve according to the first embodiment. FIG. 2 is a schematic cross-sectional view showing an example of the internal structure of the check valve shown in FIG. FIG. 2 shows an example of a cross section taken along an xy plane passing through the central axis of the check valve 1 shown in FIG. As shown in FIGS. 1 and 2, the check valve 1 includes a valve body 10 and a valve body 20.

(Valve body 10)
The valve body 10 is, for example, formed in a cylindrical shape. The valve body 10 is formed with a housing section 11, an inflow section 12, and an outflow section 13. Further, a guide member 14 and a valve body stopper member 15 are formed inside the valve body 10. Normally, a fluid such as a refrigerant flows through the valve body 10 from an inlet 12 toward an outlet 13, as shown by the solid arrow in FIG.

The accommodating portion 11 is formed in the central portion of the valve body 10 and accommodates the guide member 14, the valve body stopper member 15, and the valve body 20. The inflow portion 12 is formed at one end of the valve body 10 and serves as an inlet for fluid flowing into the check valve 1 . The outflow portion 13 is formed at the other end of the valve body 10 and serves as an outlet for fluid passing through the check valve 1 .

Pipes are connected to the inflow section 12 and the outflow section 13 by welding or the like. Piping is not limited to welding, and may be connected using screws or flanges, for example. In this example, a case will be described in which pipes are connected by welding. Further, the inflow portion 12 and the outflow portion 13 are formed to have different inner diameters. In this way, since the diameters of the pipes that can be connected to each of the inflow part 12 and the outflow part 13 are different, incorrect connection of the pipes to the valve body 10 is prevented. Thereby, the check valve 1 can be correctly installed in the direction in which it is desired to block the flow of fluid.

The valve body 10 is drawn so that the diameter thereof gradually decreases from the accommodating portion 11 toward the inflow portion 12 and the outflow portion 13, respectively. By performing the drawing process, the guide member 14 and the valve body stopper member 15 are positioned. In addition, below, the inflow part 12 side of the valve body 10 may be called a "lower part," and the outflow part 13 side may be called an "upper part" and demonstrated.

The guide member 14 provided inside the valve body 10 is formed in a cylindrical shape and guides the valve body 20 disposed inside. The guide member 14 has a guide portion 14a and a bent portion 14b. The guide portion 14a is arranged so as to be in contact with the accommodating portion 11 of the valve body 10. A bent portion 14b is provided at the lower part of the guide portion 14a and is bent inward so as to project and is integrally formed with the guide portion 14a. The bent portion 14b functions as a valve seat for the valve body 20.

FIG. 3 is a schematic diagram showing an enlarged view of the lower part of the guide member shown in FIG. 2. FIG. As shown in FIG. 3, a mating portion 14c is formed at the upper portion of the inner peripheral side of the bent portion 14b (inside the dotted line circle). The mating portion 14c comes into contact with the valve body 20 when it moves toward the inflow portion 12 side. The mating portion 14c is rounded. This is to prevent damage to the valve body 20 when the valve body 20 comes into contact with the bent portion 14b due to backflow of fluid. Further, a lower portion of the inner circumference of the bent portion 14b (inner circumference on the inflow portion 12 side) is chamfered. This is to reduce the pressure loss that occurs when the fluid flows in from the inflow portion 12 and passes inside the inner circumference of the bent portion 14b.

An arbitrary rounded chamfer is applied to the inner bent portion at the boundary between the guide portion 14a and the bent portion 14b. This is to relieve stress applied when the valve body 20 moves in the axial direction (x direction) and when fluid flows. Further, an arbitrary rounded chamfer is also applied to the outer bent portion at the boundary between the guide portion 14a and the bent portion 14b. This is to prevent the outer bent portion from damaging the inner surface of the valve body 10 at the throttle location when the valve body 10 is subjected to the drawing process.

The thickness of the bent portion 14b in the direction in which the fluid flows (x direction) is determined by, for example, the pressure of the fluid flowing inside the check valve 1, or the pressure applied when the valve body 20 contacts the bent portion 14b due to fluid flowing backwards. It is preferable to have a thickness that can withstand.

As shown in FIG. 2, in the guide member 14, the inner circumferential surface of the guide portion 14a and the inner circumferential surface of the bent portion 14b have the same axis. This prevents fluid from leaking toward the inflow section 12 due to shaft wobbling when the valve body 20 blocks the fluid flow when the fluid flows from the outflow section 13 side and flows backward.

In the first embodiment, the valve body 20 and the guide member 14 are formed so that the gap between the valve body 20 and the inner surface of the guide member 14 is reduced. This reduces wobbling when the valve body 20 moves in the axial direction (x direction), so fluid leakage due to shaft wobbling can be prevented. Further, the guide member 14 has a higher inner surface roughness to reduce frictional resistance with the valve body 20. Thereby, the valve body 20 can be smoothly moved in the axial direction (x direction).

A groove that is concave inward is formed on the outer peripheral surface of the guide portion 14a of the guide member 14, and a seal member 16 is provided in the groove. In a state in which the guide member 14 is disposed in the housing portion 11 , the seal member 16 blocks fluid flowing between the outer peripheral surface of the guide member 14 and the inner peripheral surface of the housing portion 11 . The sealing member 16 is made of a material capable of blocking the flow of fluid flowing through the gap between the guide member 14 and the housing portion 11, such as rubber, resin, or metal.

The seal member 16 is disposed, for example, at the center of the guide portion 14a in the axial direction (x direction). When manufacturing the check valve 1, brazing or the like is performed on both end surfaces of the valve body 10, but by arranging the seal member 16 in the center portion of the guide portion 14a in this way, the seal member 16 is attached to the valve body 10. It is located at the farthest position from both end faces of the main body 10. Therefore, thermal melting of the seal member 16 due to brazing or the like can be prevented.

The thickness between the inner circumferential surface and the outer circumferential surface of the guide member 14 (guide portion 14a) (thickness in the y direction) is the same as that when fluid flows and when the valve body 20 is in the axial direction (x direction) during the product life. The thickness shall be such that it will not lose its thickness even if it is moved. Further, the guide member 14 is formed using a harder material than the valve body 20. This is to prevent the guide member 14 from being damaged when the valve body 20 moves the guide member 14 in the axial direction (x direction).

FIG. 4 is a schematic diagram showing an enlarged view of the upper part of the guide member shown in FIG. 2. FIG. As shown in FIG. 4, the valve body stopper member 15 is formed in a cylindrical shape and is provided so as to be located above the valve body 20 and the guide member 14. The valve body stop member 15 functions as a stopper to prevent the valve body 20 from moving above the valve body stop member 15 when the valve body 20 opens and moves upward. That is, the valve body stopper member 15 is provided as a regulating means for regulating the valve opening operation limit of the valve body 20.

The valve body stopper member 15 is formed separately from the guide member 14. Thereby, in order to improve the pressure loss of the check valve 1, it is possible to design the check valve 1 without being restricted in the shape of each member, such as by providing an additional structure on the valve body stop member 15. . Further, by forming the valve body stopper member 15 and the guide member 14 separately, the shape of each member can be simplified.

Furthermore, by forming the valve body stopper member 15 and the guide member 14 separately, various problems that occur when manufacturing the check valve 1 can be suppressed. For example, the valve body 10 is subjected to a drawing process, but even if the valve body stopper 15 is deformed during this process, since it is separate from the guide member 14, the guide member 14 (especially the valve body 20 can be prevented from deforming. Further, for example, when the valve body stopper member 15 and the guide member 14 are integrated at a stage before being housed in the valve body 10, the guide member 14 (particularly the portion where the valve body 20 slides) may be deformed. there is a possibility. However, by making the valve body stopper member 15 and the guide member 14 separate, such deformation of the members can be prevented.

Furthermore, in Embodiment 1, the valve body 10 is manufactured by performing a drawing process while the guide member 14 and the valve body stopper member 15 are accommodated. This reduces the need for integrating the guide member 14 and the valve body stopper member 15, thereby simplifying the process for manufacturing the check valve 1.

The thickness of the valve body stop member 15 is determined by, for example, the pressure of the fluid flowing inside the check valve 1 or the impact of the valve body 20 that collides with the valve body stop member 15 when the valve body 20 is opened by the flowing fluid. It should be thick enough to withstand the force.

The corner portion of the upper outer circumferential side (outflow portion 13 side of the outer circumference) of the valve body stopper member 15 is rounded. The valve body stop member 15 is positioned by the drawing process performed on the upper part of the valve body 10, but since the corners are chamfered, the valve body stop member 15 is positioned when the drawing process is performed. Damage to the valve body 10 due to the corner coming into contact with the inner surface of the valve body 10 is prevented.

Since the valve body stop member 15 is formed into a cylindrical shape, the valve body 20 comes into surface contact with the valve body stop member 15 . In this case, compared to the case where the valve body 20 is in line contact, the impact force applied to the valve body stopper member 15 is dispersed, so that problems such as damage to the valve body stopper member 15 can be suppressed.

Note that the inner diameter of the valve body stopper member 15 is preferably made as large as possible. This is to prevent the flow of fluid flowing through the check valve 1 from being obstructed. Further, for example, the valve body stopper member 15 may have an R-chamfered corner portion on the inner peripheral side. This is to suppress sudden changes in the flow when the fluid passes through the valve stopper member 15.

Moreover, it is preferable that the valve main body 10 described above has a wall thickness that can withstand a pressure that is five times or more the design pressure of the fluid flowing inside the pipe. This product is designed to satisfy the 5x pressure burst test of the UL (Underwriters Laboratories) standard, which is the strictest of the various product safety standards (KHK standard and UL standard, etc.) for general check valves in Japan and overseas. This is to make it happen.

Furthermore, the total length (x direction) of the valve body 10 is preferably 140 mm or more. As described above, when manufacturing the check valve 1, brazing or the like is performed on both end surfaces of the valve body 10, but in this case, it is necessary to prevent the influence of heat on the seal member 16 provided on the guide member 14. It has been found that a distance of 70 mm or more is required in order to Therefore, in order to prevent heat melting of the seal member 16 due to brazing or the like to both end faces of the valve body 10, the total length of the valve body 10 needs to be 140 mm or more. In this way, by setting the entire length (x direction) of the valve body 10 to 140 mm or more, it is possible to prevent the seal member 16 provided on the guide member 14 from melting due to heat.

(Valve body 20)
The valve body 20 in FIG. 2 is arranged between the bent part 14b of the guide member 14 provided in the housing part 11 and the valve body stopper member 15, and is arranged in the housing part 11 in the axial direction (x direction) depending on the direction of fluid flow. ). When fluid flows from the inflow section 12 to the outflow section 13 , the valve body 20 moves to the outflow side within the housing section 11 . As a result, fluid passes through the check valve 1. On the other hand, when the fluid flows from the outflow section 13 to the inflow section 12, the valve body 20 moves toward the inflow side within the housing section 11 and comes into contact with the bent section 14b that functions as a valve seat. This blocks the fluid and prevents backflow within the check valve 1.

FIG. 5 is a perspective view showing an example of the configuration of the valve body in FIG. 2. FIG. As shown in FIG. 5, the valve body 20 includes a valve portion 21 and a guide portion 22.

The valve portion 21 contacts the bent portion 14b of the guide member 14, which functions as a valve seat of the valve body 10, when the fluid flows back from the outflow portion 13 to the inflow portion 12. As a result, the fluid flow path formed by the bent portion 14b is closed by the valve portion 21, so that backflow of fluid is prevented.

The guide portion 22 guides the valve body 20 when the valve body 20 moves the guide member 14 in the axial direction. The outer diameter of the guide portion 22 is approximately equal to the inner diameter of the guide member 14 of the valve body 10. The guide portion 22 has a plurality of blades that protrude in the outer circumferential direction at equal angular intervals from the central axis. Thereby, the fluid that flows in from the inflow portion 12 of the valve body 10 and passes through the flow path formed by the bent portion 14b flows out from the outflow portion 13 through between the plurality of blades. In the first embodiment, the guide portion 22 has four blades, but the number is not limited to this, and the guide portion 22 may have three or more blades in consideration of stability.

Further, the blades of the guide portion 22 have a shape that rotates regularly when the fluid passes through them. In this way, by forming the blades of the guide part 22 into a rotating shape, the blades of the guide part 22 move in the axial direction (x direction) at a fixed location, and can be moved to a specific location on the inner surface of the guide member 14. This can prevent damage caused by rubbing the chisel.

The valve body 20 has such a mass that it can be moved by the pressure of the fluid so that it moves toward the outflow section 13 when the fluid flows from the inflow section 12 to the outflow section 13. Further, the valve body 20 is made of resin or the like, and is made of a softer material than the guide member 14 . This is to prevent the guide member 14 from being damaged when the valve body 20 moves the guide member 14 in the axial direction (x direction).

Note that a hole 21a may be formed in the valve portion 21 of the valve body 20. The hole portion 21a allows the flow path on the inflow portion 12 side and the flow path on the outflow portion 13 side to communicate with each other when the valve body 20 moves toward the inflow portion 12 side and contacts the bent portion 14b of the valve body 10. By providing the hole portion 21a, the lower portion of the valve body 10 (on the inflow portion 12 side) is completely closed, and damage to the piping can be prevented. The diameter of the hole 21a is preferably about 0.4 mm or less. This is to prevent fluid from flowing backward while preventing damage to the piping.

[Operation of check valve 1]
In the check valve 1 formed in this way, when the fluid flowing in the pipe flows in from the inflow part 12 of the valve body 10, the valve body 20 receives pressure from the inflow part 12 side, so that the fluid flows in the axial direction (x direction). move to the outflow portion 13 side. Then, the valve body 20 comes into contact with the valve body stopper member 15 disposed on the outflow portion 13 side of the guide member 14 . At this time, the inflowing fluid passes between the blades of the guide portion 22 in the valve body 20 via the bent portion 14b of the guide member 14 that functions as a valve seat, and flows out from the outflow portion 13.

On the other hand, when the fluid flowing in the pipe flows in from the outflow section 13 of the valve body 10, the valve body 20 receives pressure from the outflow section 13 side and moves toward the inflow section 12 side in the axial direction (x direction). Then, the valve portion 21 of the valve body 20 comes into contact with the bent portion 14b that is provided on the inlet portion 12 side of the guide member 14 and functions as a valve seat. As a result, the fluid flowing in from the outflow portion 13 is blocked.

As described above, in the check valve 1 according to the first embodiment, the valve body stop member 15 formed in a cylindrical shape is provided on the outflow portion 13 side of the guide member 14 provided in the housing portion 11. . Thereby, when the fluid passes through the check valve 1, the flow of the fluid is prevented from being obstructed, so that pressure loss can be suppressed. In addition, since the valve body stop member 15 is formed in a cylindrical shape, the valve body 20 comes into surface contact with the valve body stop member 15 when the valve is opened, and the impact force at the time of contact is dispersed. The strength of the valve body stopper member 15 when the valve 20 is opened can be ensured.

In the check valve 1, a groove is provided on the outer periphery of the guide portion 14a, and a seal member 16 is provided in this groove. This blocks the fluid flowing between the outer circumferential surface of the guide member 14 and the inner circumferential surface of the accommodating portion 11, thereby preventing fluid leakage when the fluid flows backward.

In the check valve 1, the sealing member 16 provided in the guide portion 14a is provided in the central portion of the check valve 1 in the axial direction. Thereby, it is possible to prevent the seal member 16 from melting due to heat when the check valve 1 is manufactured by performing brazing or the like on both end surfaces of the check valve 1.

In the check valve 1, the inner periphery of the guide portion 14a and the inner periphery of the bent portion 14b of the guide member 14 have the same axis. Thereby, when fluid flows from the outflow part 13 side and flows backward, it is possible to prevent fluid leakage to the inflow part 12 side due to shaft wobbling when the valve body 20 blocks the flow of the fluid.

In the check valve 1, the bent portion 14b of the guide member 14 has a mating portion 14c formed on the inner periphery on the outflow portion 13 side, which is chamfered. Thereby, damage to the valve body 20 can be prevented when the valve body 20 comes into contact with the bent portion 14b due to backflow of fluid.

In the check valve 1, the bent portion 14b is chamfered on the inner periphery on the inflow portion 12 side. Thereby, the pressure loss that occurs when fluid flows in from the inflow portion 12 can be further reduced.

In the check valve 1, the boundary between the guide portion 14a and the bent portion 14b in the guide member 14 is chamfered. This makes it possible to alleviate the stress applied when fluid flows, and also prevents damage to the inner surface of the throttle area of the valve body 10 when the valve body 10 is subjected to a drawing process. can.

In the check valve 1, the valve body stop member 15 is chamfered on the outer periphery on the outflow portion 13 side. Thereby, when the valve body 10 is subjected to the drawing process, damage to the valve body 10 due to the corners of the valve body stopper member 15 coming into contact with the inner surface of the valve body 10 can be prevented.

In the check valve 1, the valve body stop member 15 is formed separately from the guide member 14. Thereby, the shapes of the guide member 14 and the valve body stopper member 15 can be simplified. Further, it is possible to suppress problems when manufacturing the check valve 1, and to simplify the manufacturing process.

Embodiment 2.
Next, Embodiment 2 will be described. The second embodiment differs from the first embodiment in that a protrusion is provided in the housing portion 11 of the valve body 10 between the guide member 14 and the valve body stopper member 15. In the second embodiment, parts common to those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 6 is a schematic cross-sectional view showing an example of the internal structure of the check valve according to the second embodiment. Similar to Embodiment 1, FIG. 6 shows an example of a cross section taken along an xy plane passing through the central axis of check valve 1 having the appearance shown in FIG. As shown in FIG. 6, the check valve 1 includes a valve body 10 and a valve body 20. Further, the valve body 10 is formed with an accommodating portion 11 in which a guide member 14 and a valve body stopper member 15 are provided, an inflow portion 12, and an outflow portion 13.

In the second embodiment, the housing portion 11 is formed with a protrusion 17 that protrudes inward. The protrusion 17 is provided between the guide member 14 and the valve body stopper member 15, and is provided for positioning both members. The protruding portion 17 may be provided on the entire inner periphery of the accommodating portion 11 or may be provided on a part of the inner periphery. That is, the protrusion 17 may be provided in any manner as long as it can position the guide member 14 and the valve body stopper member 15.

By providing the protruding portion 17 in this manner, the guide member 14 and the valve body stopper member 15 do not come into contact with each other. Therefore, positioning can be easily performed without bringing the guide member 14 and the valve body stopper member 15 into contact with each other.

FIG. 7 is an enlarged schematic diagram showing the vicinity of the valve body stopper member in FIG. 6. As shown in FIG. 7, in the guide portion 14a of the guide member 14, the corners (inside the dotted circle) of the surface (top surface) on the outflow portion 13 side are rounded. This is to prevent the protrusion 17 from being damaged when the guide member 14 comes into contact with the protrusion 17. Further, in the valve body stopper member 15, the corners (inside the dot-dashed line circles) of the surface (lower surface) on the inflow portion 12 side are also rounded to prevent damage to the protruding portion 17.

As described above, in the second embodiment, the housing portion 11 is provided with the protruding portion 17 that protrudes inward between the guide member 14 and the valve body stopper member 15. Thereby, positioning can be easily performed without bringing the guide member 14 and the valve body stopper member 15 into contact with each other.

Although the first and second embodiments have been described above, the present disclosure is not limited to the first and second embodiments described above, and various modifications and applications are possible without departing from the gist of the present disclosure. be. For example, in Embodiments 1 and 2, a case has been described in which the guide member 14 and the valve body stopper member 15 are formed separately, but the guide member 14 and the valve body stopper member 15 are not limited to this. , may be integrally formed.

FIG. 8 is a schematic cross-sectional view showing an example of the internal structure of a check valve in which the guide member and the valve body stopper member are integrally formed. As shown in FIG. 8, in the check valve 1 of this example, a valve body stop portion 14d is formed on the upper part of the guide member 14 formed in the housing portion 11. As shown in FIG.

The valve body stop portion 14d is bent inward and formed integrally with the guide portion 14a. The valve body stop portion 14d functions as the valve body stop member 15 in the first and second embodiments.

Further, in this case, the valve body 20 is included in the guide member 14. Then, when the fluid flows in from the inflow section 12 of the valve body 10, the valve body 20 moves in the axial direction (x direction) from the inflow section 12 side to the outflow section 13 side, and comes into contact with the valve body stop part 14d. On the other hand, when fluid flows in from the outflow part 13 of the valve body 10, the valve body 20 moves in the axial direction (x direction) from the outflow part 13 side to the inflow part 12 side, and comes into contact with the bent part 14b.

In this way, even when the guide portion 14a and the valve body stop portion 14d are integrally formed, the pressure loss that occurs when fluid flows through the check valve 1 can be suppressed, as in the first and second embodiments. At the same time, it is possible to ensure the strength when the valve body 20 is opened.

In addition, the guide member 14 of such a check valve 1 can be produced by performing press working, for example. Specifically, by pressing both ends of the cylindrical member forming the guide member 14 with the valve body 20 housed therein, the inwardly bent bent portion 14b and the valve body stop portion 14d are formed. It is formed.

Reference Signs List 1 Check valve, 10 Valve body, 11 Storage part, 12 Inflow part, 13 Outflow part, 14 Guide member, 14a Guide part, 14b Bend part, 14c Matching part, 14d Valve body stop part, 15
Valve body stop member, 16 Seal member, 17 Projection portion, 20 Valve body, 21 Valve portion, 22 Guide portion.

Claims (9)

A valve body formed in a cylindrical shape,
a valve body provided within the valve body and movable in the axial direction of the valve body;
The valve body is
an accommodating portion formed in a cylindrical shape and accommodating the valve body;
an inflow portion formed at one end into which fluid flows;
an outflow portion formed at the other end from which the fluid flows out;
The accommodating part is
a guide member having a guide portion that guides the accommodated valve body; and a bent portion that is formed by bending the inflow side of the guide portion inward and functions as a valve seat;
A check that is formed separately from the guide member and has a cylindrical valve stopper member formed on the outlet side of the guide member to restrict movement of the valve body toward the outlet side. valve. The guide section is
A groove is provided on the outer periphery,
The check valve according to claim 1, wherein a sealing member is provided in the groove. The guide section is
The check valve according to claim 2, wherein the sealing member is provided at the central portion in the axial direction. The guide member is
The check valve according to any one of claims 1 to 3, wherein the inner periphery of the guide portion and the inner periphery of the bent portion have the same axis. The bent portion is
A mating portion that contacts the valve body is formed on the outflow portion side of the inner periphery,
The check valve according to any one of claims 1 to 4, wherein the mating portion is chamfered. The bent portion is
The check valve according to any one of claims 1 to 5, wherein the inner circumference of the check valve is chamfered on the inlet side. The guide member is
The check valve according to any one of claims 1 to 6, wherein a boundary between the guide portion and the bent portion is chamfered. The valve body stopper member is
The check valve according to any one of claims 1 to 7, wherein the outer periphery of the outflow portion side is chamfered. The accommodating part is
The check valve according to any one of claims 1 to 8, wherein a protrusion protruding inward is provided between the guide member and the valve stopper member.

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