JP3232939B2 - Check valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve in which a check valve assembly using a valve member is prevented from being deformed during press-fitting.

[0002]

2. Description of the Related Art A check valve has a function of flowing a fluid in one direction only from upstream to downstream, and a check valve function depends on the close contact between a valve seat of a housing member and a valve member. Therefore, in manufacturing and mounting the check valve assembly, it is necessary to assemble the check valve assembly while maintaining a high accuracy of the valve seat and the valve member with a certain accuracy, and to press-fit the same into the pipeline of the fluid device.

Accordingly, a check valve assembly for assembling a valve seat and a valve member while maintaining a certain degree of accuracy has been proposed in Japanese Utility Model Laid-Open Publication No. Hei.
No. 168071. FIG. 8 is a sectional view of the conventional check valve, and FIG. 9 is an exploded sectional view of the conventional check valve assembly.

[0004] As shown in FIG. 8, a check valve assembly 100A includes a ball 110 as a valve member and a ball 11 in a hollow portion 101 of a housing member 100 shown in FIG.
The seat member 106 having a seat surface 107 which is a valve seat that comes into contact with the housing member 100 is inserted (in the directions of arrows A and B), and the tip 102A of the small diameter portion 102 of the housing member 100 is crimped (bent inward) to manufacture (form). .

The check valve assembly 100
A is press-fitted into the pipeline 201 of the fluid device 200. That is,
Check valve assembly 10 in the state shown by the two-dot chain line in FIG.
The check valve assembly 100A is disposed at the position indicated by the solid line in FIG. 8 by pressing and pressing OA in the direction of arrow C using a jig (not shown).

In this structure, the sheet surface 107 of the sheet member 106 is connected to the hollow portion 101 of the housing member 100.
Of the check valve assembly 100A and separated from the press-fitting portion and the caulking portion of the check valve assembly 100A.
7 is suppressed.

However, when the sheet member 106 is pressed into the front end portion 102A of the housing member 100 or when the front end portion 1
When caulking 02A, a radial load is input to the seat member 106, so that the seat member 106 is deformed in the direction of arrow D, and as a result, the seat surface 107 is deformed, The sealing property with 110 decreases.

When the check valve assembly 100A is press-fitted into the conduit 201 of the fluid device 200, a radial load is applied to the large-diameter portion 103 of the housing member 100, and this load is applied to the small-diameter portion 102 (caulking). Part) to be transformed. In other words, the influence of the deformation of the small-diameter portion 102 causes the deformation of the sheet member 106 in the direction of arrow D, and the result also extends to the seat surface 107, and the sealing performance between the seat surface 107 and the ball 110 is reduced. .

In view of the above, it is an object of the present invention to provide a check valve in which a seat surface is not deformed by a load at the time of caulking or press-fitting a housing member.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a check valve which is press-fitted into a pipeline to form a one-way passage in a part of a fluid device, wherein the large-diameter portion and the small-diameter portion for press-fitting are provided in the outer shape. While forming, a hollow housing member having a step between the large diameter portion and the small diameter portion, a through hole that penetrates the housing member in the axial direction, and a valve seat is formed in the small diameter portion ,
A valve member disposed in the through-hole of the housing member corresponding to the valve seat, and connected to a side opposite to the large-diameter portion of the small-diameter portion,
And a caulking portion which is deformed by caulking force and holds the valve member in the through hole.

[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 using, for example, a caulking jig. The small-diameter portion or the large-diameter portion is set to be thick enough to withstand a caulking force acting in a radial direction or the like, so that the caulking does not affect the valve seat. Further, the housing member after the valve member is inserted and swaged is press-fitted into the pipeline of the fluid device. During this press-fitting, the valve seat is
The valve seat is not affected by the radial load because the valve seat is disposed in the small-diameter portion that is spaced apart from the valve seat.

[0012]

【Example】

(First Embodiment) FIGS. 1 to 4 show a first embodiment of the present invention. FIG. 1 shows 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 substantially cylindrical housing member 11 has a large-diameter portion 11A, a small-diameter portion 11B, and a caulked portion 11C connected to the outer shape thereof. A step 12 is formed between the large-diameter portion 11A and the small-diameter portion 11B in a radial direction (a direction perpendicular to the axis). In addition, between the small diameter part 11B and the caulking part 11C, it is an inclined step part.

The housing member 11 is formed with a passage 13 having a small diameter and a hollow portion 14 having a diameter larger than the passage 13 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 as a seat is formed.

The seat surface 15 of the present embodiment is disposed at a position substantially corresponding to the step 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 is caulking the caulking portion 11C, and the radial direction when the check valve assembly 10 is press-fitted into the conduit 51 of the fluid device 50. It is assumed that the load is not affected. That is, the small diameter portion 11
B is set to a thickness sufficient to withstand a caulking load when caulking the caulking portion 11C. Also, the large diameter portion 11A
Is set to a thickness that withstands a radial load when the housing member 11 is pressed into the conduit 51 of the fluid device 50. The 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 sufficient thickness to hold a ball 40 described later in the hollow portion 14. Further, in the method of caulking the caulking portion 11C, in this embodiment, the caulking portion 11C is pressed in the axial direction of the housing member 11 by a jig (not shown) 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 51 and a small-diameter pipe 52 are connected to the fluid device 50 via a step. The large-diameter conduit 51 has a slightly smaller diameter than the large-diameter portion 11 </ b> A of the housing member 11. The small-diameter conduit 52 is shown in FIG.
As shown in the figure, the diameter is smaller than 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 into the hollow portion 14 of the housing member 11 in the direction of arrow D. After the insertion, the check valve assembly 10 is manufactured by pressing the tip of the caulked portion 11C along the axial direction of the housing member 11 with a jig (not shown).

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. Directional load, bending load), and the influence of caulking does not reach the sheet surface 15;
5 can be prevented. Therefore, a stable caulked shape can be formed, and the occurrence of defective products can be prevented.

Next, a procedure for mounting the check valve assembly 10 in the conduit 51 of the fluid device 50 will be described with reference to FIGS.

As shown in FIG. 3, a surface 60B which has a relief portion 60A which is a columnar concave portion large enough to accommodate the small diameter portion 11B and the caulked portion 11C of the housing member 11 and which can abut the step portion 12. The check valve assembly 10 is pressed into the conduit 51 using a jig 60 having Then, as shown in FIG. 4, press-fitting is performed until the housing member 11 of the check valve assembly 10 comes into contact with the stepped 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 line 5 of the fluid device 50.
At the time of press-fitting, the large-diameter portion 11A is larger in diameter than the small-diameter portion 11B, and a step 12 is formed between them. Can be prevented.

Furthermore, according to this embodiment, the step 12 of the housing member 11 can be used as a 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 swaged portion 11C is not deformed even during this pressing.

According to this embodiment, the fluid device 50
Member 1 serving as a portion that press-fits against pipe line 51
Since the large-diameter portion 11A and the caulked portion 11C are separated to prevent deformation of the seat surface 15, the check valve assembly 10 before press-fitting can be inspected in the same state as used after press-fitting. Therefore, it is not necessary to press-fit a defective product in the inspection state, and the check valve assembly 10 having a good inspection state (use state) can be press-fitted.

(Second Embodiment) FIGS. 5 and 6 show a second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is 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 of a case in which there is no influence of a radial load when press-fitting into the pipeline 51 of FIG. In other words, the seat surface 15 has the large diameter portion 11.
Since it is necessary to keep the housing member 11 in the axial direction, the housing member 11 is disposed in the small-diameter portion 11B (substantially in the axial direction of the small-diameter portion 11B).

As shown in FIG. 6, the caulking means of this embodiment is an example in which the caulking portion 11C is pressed from a substantially central side surface in the axial direction. In this caulking, a caulking force is applied from the outside of the caulked portion 11C to the inside in the diametrical direction over the entire circumference to reduce the inner diameter of the caulked portion 11C, thereby forming the reduced portion 11D and preventing the ball 40 from coming off. The reduced portion 11D may be formed on the entire periphery of the caulked portion 11C, or may be formed only on a part thereof.

The portion to be caulked may be the site shown in FIG. 6 or another portion such as the tip of the caulked portion 11C 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 press-fitted into the conduit 51 of the fluid device 50, the deformation of the seat surface 15 can be prevented without being affected by the radial load on the small diameter portion 11 (the seat surface 15). Other functions and effects are the same as those of the above-described embodiment.

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

In this embodiment, the small diameter portion 11B is
This is an example in which the seat surface 15 is not affected by the radial load when caulking 1C. That is, the seat surface 15 is connected to the large-diameter portion 11 having a sufficiently large thickness in the radial direction of the housing member 11.
A, and was arranged radially away from the small diameter portion 11B so that the deformation load during 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 swaged, the large-diameter portion 11A is not affected by the radial load. Deformation can be prevented. Other functions and effects are the same as those of the first embodiment.

In the first to third embodiments, the step 1
Although 2 is a plane perpendicular to the axis, if it is axially symmetric, the present invention can be similarly applied to an inclined surface on which no deformation load acts on the seat surface 15. In the first to third embodiments, the swaged portion 11C is thinner than the small diameter portion 11B.
If the caulking portion 11C can be caulked, the small-diameter portion 11
The same applies to the case where the thickness is larger than B.

[0034]

As described above, according to the present invention, it is possible to obtain a check valve in which the seat surface is not deformed by the load at the time of swaging or press-fitting the swaging portion of the housing member.

[Brief description of the 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 a ball is inserted into the housing member of the first embodiment.

FIG. 3 is a cross-sectional view showing a state in which the check valve assembly according to the first embodiment is pressed into a fluid device by a jig.

FIG. 4 is a cross-sectional view showing a state where the check valve assembly according to 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 sectional view of a conventional check valve assembly.

[Explanation of symbols]

 DESCRIPTION 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

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroyuki Hatakeyama 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (56) References JP-A-64-35181 (JP, A) (JP, U) Japanese Utility Model Hei 6-49868 (JP, U) Japanese Utility Model 60-5159 (JP, Y2) Japanese Utility Model Utility Model 3-55013 (JP, Y2) (58) Fields surveyed (Int. Cl. ⁷⁾ , DB name) F16K 15/00-15/20

Claims (1)

(57) [Claims] 1. A check valve press-fitted into a conduit 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 between the large-diameter portion and the small- diameter portion, a through-hole passing through the housing member in the axial direction, and a valve seat being formed in the small-diameter portion ; A valve member disposed in the hole corresponding to the valve seat, connected to the opposite side of the large-diameter portion of the small-diameter portion, deformed by a caulking force, and a caulking portion holding the valve member in the through-hole; A check valve comprising: