JPH08219313A - Check valve - Google Patents

Abstract

PURPOSE: To provide a check valve without the deformation of a seal surface by the load at the time of the caulking or press fit of a housing member. CONSTITUTION: When a caulking part 11C is caulked, since a small diameter part 11B has a larger diameter and higher rigidity than those of the part 11c, the part 11c has bearing force to a diameter direction load, and the caulking can not affect a seat surface 15 to prevent the deformation of the surface 15. When a housing member 11 is pressed in the pipe line 51 of a fluid apparatus 50, since a large diameter part 11A has a diameter larger than that of the part 11b to cause a step part 12 between both sides to generate the bearing force to diameter direction load input at the time of press fit, the deformation of the surface 15 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve designed to prevent deformation of a check valve assembly using a valve member during press-fitting.

[0002]

2. Description of the Related Art A check valve has a function of allowing a fluid to flow in one direction only from upstream to downstream, and a backflow prevention function depends on the close contact between a valve seat of a housing member and a valve member. Therefore, when manufacturing and mounting the check valve assembly, it is necessary to assemble the check valve assembly while maintaining a highly accurate valve seat and valve member with a certain degree of accuracy, and press fit them into the pipeline of the fluid device.

Therefore, a check valve assembly for assembling the valve seat and the valve member while maintaining a certain degree of accuracy is an actual flat valve 1-
No. 168071. 8 is a sectional view of the conventional check valve, and FIG. 9 is an exploded sectional view of the conventional check valve assembly.

As shown in FIG. 8, a check valve assembly 100A includes a ball 110, which is a valve member, and a ball 11 in a hollow portion 101 of a housing member 100 shown in FIG.
A seat member 106 having a seat surface 107 that is a valve seat that abuts 0 is inserted (direction of arrows A and B), and a tip 102A of a small diameter portion 102 of a housing member 100 is caulked (folded inward) to be manufactured (formed). .

Then, the check valve assembly 100
A is press-fitted into the pipe line 201 of the fluid device 200. That is,
Check valve assembly 10 in the state of the chain double-dashed line in FIG.
The check valve assembly 100A is arranged at the position shown by the solid line in FIG. 8 by press-fitting 0A in the direction of arrow C using a jig (not shown).

In this structure, the seat surface 107 of the seat member 106 is connected to the hollow portion 101 of the housing member 100.
The seat surface 10 by arranging the check valve assembly 100A on the inner side of the seat and separating it from the press-fitting portion and the crimping portion of the check valve assembly 100A.
The deformation of No. 7 is suppressed.

However, when the sheet member 106 is press-fitted into the tip portion 102A of the housing member 100 or the tip portion 1
When the 02A is swaged, a radial load is input to the seat member 106, so that the seat member 106 is deformed in the direction of the arrow D, and as a result, the seat surface 107 is deformed. The sealing property with 110 is deteriorated.

Further, when the check valve assembly 100A is press-fitted into the conduit 201 of the fluid device 200, a radial load is input to the large diameter portion 103 of the housing member 100, so this load is applied to the small diameter portion 102 (caulking). Part) is also input and transformed. That is, the influence of the deformation of the small diameter portion 102 causes the seat member 106 to be deformed in the direction of the arrow D, and as a result, the seat surface 107 is also deformed, and the sealing property between the seat surface 107 and the ball 110 is deteriorated. .

In view of the above facts, an object of the present invention is to obtain a check valve in which the seat surface is not deformed by the load when the caulking portion of the housing member is caulked or press-fitted.

[0010]

DISCLOSURE OF THE INVENTION The present invention is a check valve which is press-fitted into a conduit to form a one-way passage in a part of a fluid device, and has a large-diameter portion and a small-diameter portion for press-fitting in its outer shape. A hollow housing member that is formed and has a step portion between the large diameter portion and the small diameter portion; a through hole that axially penetrates the housing member and a valve seat is formed in an intermediate portion; The valve member arranged in the through hole of the member corresponding to the valve seat is connected to the opposite side of the large diameter portion of the small diameter portion and is deformed by the caulking force to hold the valve member in the through hole. And a part.

[0011]

According to the above construction, after the valve member is inserted into the through hole of the housing member, the caulking portion is caulked by using a caulking jig, for example. Since the small-diameter portion or the large-diameter portion is set to have a wall thickness that can withstand the caulking force acting in the radial direction or the like, the caulking does not affect the valve seat. Further, the housing member after the valve member is inserted and caulked is press-fitted into the conduit of the fluid device. At the time of this press-fitting, in the configuration in which the valve seat is arranged in the small diameter portion, the small diameter portion is axially separated from the large diameter portion, so the valve seat may be affected by the radial load. Absent. Further, when the valve seat is arranged in the large diameter portion, the large diameter portion is set to have a wall thickness that can withstand press-fitting (radial load), so that the valve seat is not affected by the radial load.

[0012]

【Example】

(First Embodiment) FIGS. 1 to 4 show a first embodiment of the present invention. 1 is a check valve assembly 10
FIG. 2 is a view showing a state in which the ball 40 is inserted into the housing member 11.

The outer shape of the substantially cylindrical housing member 11 is formed by connecting a large diameter portion 11A, a small diameter portion 11B and a caulking portion 11C. A step portion 12 is formed between the large diameter portion 11A and the small diameter portion 11B in the radial direction (direction orthogonal to the axis). Note that there is an inclined step between the small diameter portion 11B and the crimped portion 11C.

A small-diameter passage 13 and a hollow portion 14 having a larger diameter than the passage 13 are formed in the housing member 11 along the axis thereof, and a valve is provided between the passage 13 and the hollow portion 14. A seat surface 15 having a truncated cone shape that is a seat is formed.

The seat surface 15 of this embodiment is arranged at a portion substantially corresponding to the step portion 12 when viewed in the axial direction of the check valve assembly 10. The position of the seat surface 15 is not affected by the radial load when the small diameter portion 11B crimps the crimped portion 11C, and the radial direction when the check valve assembly 10 is press-fitted into the conduit 51 of the fluid device 50. This is based on the assumption that it is not affected by the load. That is, the small diameter portion 11
B is set to a thickness that can sufficiently withstand the caulking load when caulking the caulking portion 11C. Also, the large diameter portion 11A
Is set to have a wall thickness that can withstand a radial load when the housing member 11 is press-fitted into the conduit 51 of the fluid device 50. The wall thickness of the small diameter portion 11B or the large diameter portion 11A is determined by a test or the like.

The caulking portion 11C is set to have a wall thickness sufficient to hold the ball 40 described later in the hollow portion 14. Further, the caulking method of the caulking portion 11C is performed by pressing the caulking portion 11C along the axial direction of the housing member 11 with a jig (not shown) in this embodiment to move the caulking portion 11C from the state of FIG. 2 to the state of FIG. Bend inward.

As shown in FIG. 4, a large-diameter pipe line 51 and a small-diameter pipe line 52 are connected to the fluid device 50 via a step portion. The large-diameter conduit 51 is slightly smaller than the large-diameter portion 11A of the housing member 11. The small diameter conduit 52 is shown in FIG.
As shown in, the diameter is smaller than that of the large diameter portion 11A.

Next, a procedure for manufacturing the check valve assembly 10 will be described. As shown in FIG. 2, the ball 40 is inserted in the hollow portion 14 of the housing member 11 in the arrow D direction. After the insertion, the tip of the crimped portion 11C is crimped by pressing it along the axial direction of the housing member 11 with a jig (not shown) to manufacture the check valve assembly 10.

According to this embodiment, when the caulking portion 11C is caulked, the small diameter portion 11B is larger in diameter and thicker than the caulking portion 11C and has high rigidity, so that the small diameter portion 11B has a caulking force (radial direction or axial direction). Directional load, bending load), the influence of caulking does not affect the seat surface 15, and the seat surface 1
The deformation of No. 5 can be prevented. Therefore, it is possible to stably form the crimped shape and prevent the occurrence of defective products.

Subsequently, a procedure for mounting the check valve assembly 10 on the conduit 51 of the fluid device 50 will be described with reference to FIGS. 3 and 4.

As shown in FIG. 3, a surface 60B having a recess 60A which is a cylindrical recess having a size for accommodating the small-diameter portion 11B and the caulked portion 11C of the housing member 11 and which can contact the step portion 12. The check valve assembly 10 is pressed into the conduit 51 using the jig 60 having Then, as shown in FIG. 4, the housing member 11 of the check valve assembly 10 is press-fitted until it comes into contact with the step portion between the conduits 51 and 52 of the fluid device 10.

According to this embodiment, the check valve assembly 10 (housing member 11) is connected to the conduit 5 of the fluid device 50.
When press-fitting into 1, the large-diameter portion 11A has a larger diameter than the small-diameter portion 11B, and a step portion 12 is formed between them, so that there is a resistance against a radial load input at the time of press-fitting. Can be prevented.

Further, according to this embodiment, the stepped portion 12 of the housing member 11 can be used as the pressing surface of the jig 60, and when the jig 60 presses the housing member 11 without contacting the caulking portion 11C. Also, since there is no influence of the jig 60, the caulking portion 11C is not deformed even during this pressing.

According to this embodiment, the fluid device 50
Housing member 1 which is a portion that press-fits and abuts on the conduit 51 of
Since the large diameter portion 11A of 1 and the crimp portion 11C are separated to prevent the deformation of the seat surface 15, the check valve assembly 10 before press-fitting can be inspected in the same state of use after press-fitting. Therefore, a defective product in this inspection state is not pressed in, and the check valve assembly 10 in a good inspection state (usage state) can be pressed in.

(Second Embodiment) FIGS. 5 and 6 show a second embodiment of the present invention. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

FIG. 5 is a sectional view of the housing member, and FIG. 6 is a sectional view of the check valve assembly. In this embodiment, the seat surface 15 connects the check valve assembly 10 to the fluid device 50.
This is an example in the case of being unaffected by the radial load when press-fitting into the conduit 51. That is, the seat surface 15 has the large-diameter portion 11
Since it is necessary to move away from A in the axial direction, it is arranged within the small diameter portion 11B of the housing member 11 (approximately the center of the small diameter portion 11B in the axial direction).

Further, as shown in FIG. 6, the caulking means of this embodiment is an example in which the caulking portion 11C is caulked by being pressed from the side surface substantially in the center in the axial direction. The caulking applies caulking force from the outside of the caulking portion 11C to the inside in the diametrical direction over the entire circumference to reduce the inner diameter of the caulking portion 11C to form the contracted portion 11D and prevent the ball 40 from coming out. The reduced portion 11D may be formed on the entire circumference of the crimped portion 11C or may be formed on only a part thereof.

Whether the portion to be caulked is the portion shown in FIG. 6 or another portion such as the tip of the caulking portion 11C can be similarly applied as long as the ball 40 can be held in the hollow portion 14. .

Also in this embodiment, since the seat surface 15 is kept away from the large diameter portion 11A, the check valve assembly 1
Even when 0 is pressed into the conduit 51 of the fluid device 50, the small-diameter portion 11 (seat surface 15) is not affected by the radial load, and the deformation of the seat surface 15 can be prevented. The other operational effects are the same as those in the above-mentioned embodiment.

(Third Embodiment) FIG. 7 shows a housing member 11 used in a check valve according to a third embodiment of the present invention. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, the small diameter portion 11B is the caulking portion 1
This is an example of the case where the seat surface 15 is not affected by the radial load when caulking 1C. That is, the seat surface 15 is formed on the large diameter portion 11 of the housing member 11 having a sufficiently large radial thickness.
It was arranged in A and was kept away from the small diameter portion 11B in the radial direction so that the deformation load at the time of press fitting did not reach the seat surface 15.

Also in this embodiment, since the seat surface 15 is kept away from the small diameter portion 11B, even when the caulking portion 11C is caulked, the large diameter portion 11A is not affected by the radial load, and the seat surface 15 Deformation can be prevented. The other operational effects are similar to those of the first embodiment.

In the first to third embodiments, the step portion 1
Although 2 is a plane perpendicular to the axis, if it is axisymmetric, it can be applied in the same manner even if it is an inclined surface to which a deformation load does not act on the seat surface 15. Moreover, in the said 1st-3rd Example, although the crimping | crimped part 11C is made thinner than the small diameter part 11B,
If the caulking portion 11C can be caulked, the small diameter portion 11
Even if it is thicker than B, it can be similarly applied.

[0034]

As described above, according to the present invention, it is possible to obtain the check valve in which the seat surface is not deformed by the load when the caulking portion of the housing member is caulked or press-fitted.

[Brief description of drawings]

FIG. 1 is a sectional view showing a check valve assembly according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the housing member showing a state before inserting balls into the housing member of the first embodiment.

FIG. 3 is a cross-sectional view showing a state in which the check valve assembly of the first embodiment is press-fitted into a fluid device with a jig.

FIG. 4 is a cross-sectional view showing a state in which the check valve assembly of the first embodiment is mounted on a fluid device.

FIG. 5 is a sectional view showing a housing member according to a second embodiment.

FIG. 6 is a sectional view showing a check valve assembly according to a second embodiment.

FIG. 7 is a sectional view showing a housing member according to a third embodiment.

FIG. 8 is a sectional view showing a conventional check valve.

FIG. 9 is an exploded cross-sectional view of a conventional check valve assembly.

[Explanation of symbols]

 10 Check valve assembly 11 Housing member 11A Large diameter part 11B Small diameter part 11C Caulking part 12 Step part 14 Hollow part 15 Seat surface (valve seat) 40 Ball 50 Fluid equipment 51 Pipe line

Front page continued (72) Inventor Hiroyuki Hatakeyama 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Co., Ltd.

Claims (1)

[Claims] 1. A check valve which is press-fitted into a pipe line to form a one-way passage in a part of a fluid device, wherein a large-diameter portion and a small-diameter portion for press-fitting are formed in an outer shape,
A hollow housing member having a step portion between the large diameter portion and the small diameter portion, a through hole that axially penetrates the housing member and a valve seat is formed in an intermediate portion, and a through hole of the housing member A valve member disposed corresponding to the valve seat, and a caulking portion that is connected to the opposite side of the large diameter portion of the small diameter portion and is deformed by a caulking force to hold the valve member in the through hole. A check valve characterized by having.