JP2001280521A - Backflow preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a backflow preventing deice, allowing improvement of heat-resistance performance, and allowing easy engagement of a casing part 1 with a valve element hold part 3 without causing a break in assembling to facilitate the assembling. SOLUTION: In this backflow preventing device, at least one of the casing part 1 and the valve element hold part 3 is formed with axial cutouts, so that the an engagement part is bent radially sufficiently to easily assemble the backflow preventing device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backflow preventing device mainly incorporated in a valve, a pipe joint or the like connected to a water supply pipe.

[0002]

2. Description of the Related Art A conventional backflow prevention device is disclosed in
No. 81650 and the like. As shown in FIG. 9, this is constituted by a casing 1, a valve body 2, and a valve body holding unit 3. The material is based on the use of a synthetic resin having a relatively high elasticity such as polyacetal, etc. The casing 1 and the valve body suppressing portion 3 are also made of a cylinder having a continuous edge by utilizing the elasticity during assembly. Fitted in shape.

[0003]

However, a synthetic resin having a relatively high elasticity, such as a polyacetal, such as a conventional backflow prevention device, generally does not have such a high heat resistance, and may deform or melt under high temperature use. The problem of taking out occurs. Therefore, in order to improve the heat resistance, it is easy to use a material having heat resistance such as a synthetic resin mixed with glass fiber or the like. However, a material having heat resistance has a relatively high rigidity, so that not only the casing portion 1 and the valve body suppressing portion 3 are hardly bent at the time of assembling and fitting is difficult,
It may be damaged.

[0004] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to improve the heat resistance performance,
An object of the present invention is to provide a backflow prevention device that can be easily assembled so that the casing portion 1 and the valve body suppressing portion 3 are not easily fitted or damaged during assembly.

[0005]

Means for Solving the Problems In order to solve the above problems, a backflow prevention device according to each claim of the present invention will be described.

In the backflow prevention device according to the first aspect, one or both of the casing portion and the valve body holding portion are provided with:
Since the cutout is provided in the axial direction, the fitting portion is sufficiently bent in the radial direction, so that the assembling can be easily performed.

According to the second aspect of the present invention, since the notch in the radial direction is provided in the valve body holding portion, the fitting portion of the valve body holding portion is sufficiently bent in the axial direction, so that the assembly can be easily performed.

According to a third aspect of the present invention, a means is provided for making the hooking position of the valve body holding portion and the casing portion movable, so that the valve opening amount is adjusted even for the same member, and the flow is controlled even in regions having different hydrostatic pressures. Pressure can be regulated.

According to the present invention, the display of the used water pressure, the used area, and the like is provided at the hooking position, so that the flow pressure can be easily adjusted by adjusting the valve opening amount with reference to the display.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an exploded perspective view of a first embodiment showing an embodiment of a backflow prevention device of the present invention.
FIG. 2 is a sectional view of the first embodiment. In the backflow prevention device shown in these figures, the O-ring 6 is fitted into the O-ring groove 5 of the valve body portion 4, the O-ring 9 is fitted into the O-ring groove 8 of the casing portion 7, and the valve body of the valve body holding portion 10 is provided. With the spring 12 as an elastic body inserted outside the guide 11 and the valve shaft 13 inserted inside, the valve body holding portion 10 is inserted into the casing portion 7 from the outflow side 14, and the rib 15 The spring 12 is compressed and the O-ring 6 is seated on the seat as a valve seat by the hooking claw 16 projecting in the radial direction from the insertion portion 23 extending in the axial direction from the outer peripheral edge 22 through the hooking groove 17. It is pressed against the surface 18 to prevent backflow. When the fluid pressure is applied from the inflow side 19, the spring 12 is moved until the valve body contact surface 21 contacts the valve body contact surface 20.
Is further compressed, and the valve body 4 is opened to flow water.

According to the present embodiment, when assembling the backflow prevention device, the axial notch 24 from the outflow side 14 of the casing portion 7 causes the outer periphery to expand in the radial direction, so that the valve body holding portion 10 is engaged. The pawl 16 can be easily inserted into the hook groove 17. Further, the locking groove 17 may be provided in the valve body suppressing portion 10, and the locking claw 16 may be provided in the casing portion 7, or the axial notch 24 may be provided in the valve body suppressing portion 10 or the casing portion 7 and the valve body suppressing portion. It may be in both of 10.

FIG. 3 is an exploded perspective view of a second embodiment showing a backflow prevention device according to the present invention. Hereinafter, points different from the first embodiment will be described. The valve body suppressing portion 25 has no edge connected to the outer periphery, and is provided with a radial cutout 26.

According to this embodiment, when assembling the backflow prevention device, the rib 27 is bent in the axial direction on the outflow side by eliminating the edge connected to the outer periphery of the valve body suppressing portion 25 and providing the radial cutout 26. As a result, the rib 2 of the valve body
The hooking claw 28 at the end of the housing 7 has a hooking groove 3
0 can be easily inserted.

FIG. 4 is a front view of a third embodiment showing a backflow prevention device according to the present invention. FIG. 5 is an exploded perspective view of the third embodiment. Hereinafter, points different from the first and second embodiments will be described. An axial notch 32 is provided from the inflow side 31 of the outer periphery of the valve body suppressing portion 36, and a hooking claw 33 near the inflow side end of the outer circumference is engaged with a series of locking grooves 35 of the casing portion 34.

According to the present embodiment, when assembling the backflow prevention device, since the engaging grooves 35 are formed in a series, there is no need to position the engaging claws 33 and the engaging grooves 35 in the circumferential direction, thereby assembling. Can be Further, the axial notch 32 may be provided in the casing portion 34, and the series of engaging grooves 35 may be provided in the frame suppressing portion 36.

FIG. 6 is a cross-sectional front view of a fourth embodiment showing an embodiment of a backflow prevention device of the present invention. FIG. 7 is an exploded perspective view of the fourth embodiment. Hereinafter, points different from the first to third embodiments will be described. A plurality of locking grooves 38 of the casing portion 37 are provided on the axial direction side, and the locking claw 39 changes the position of the locking groove 38 to be locked, thereby changing the position of the valve body guide contact surface 40 of the valve body holding portion 36. And valve body contact surface 4
1, that is, the valve opening amount when the valve body is fully opened can be adjusted.

FIG. 8 is a front view of a fifth embodiment showing a backflow prevention device according to the present invention. Hereinafter, points different from the fourth embodiment will be described. In the casing portion 42, the indication 44 of the appropriate working water pressure is marked on each of the plurality of engaging grooves 43 in the axial direction. For example, when the water pressure at the place where the backflow prevention device is used is 0.6 MPa, as shown in FIG. 8, the locking claw 39 of the valve element suppressing portion 36 is inserted into the lower locking groove 38 indicated as 0.6 MPa. Hang it. In addition, this mark may be a display of a use area as long as it serves as a guide for adjusting the valve opening amount.

In the embodiments described above, the casing section and the valve body holding section can be combined with each other, and the form of the backflow prevention device does not depart from the gist of the present invention. May be changed as appropriate.

[0019]

According to the present invention, the following effects are exhibited by the above configuration.

(1) In the backflow prevention device according to claim 1, wherein the valve body and the elastic portion are accommodated in the casing having the valve seat and the valve body suppressing portion, one of the casing and the valve body suppressing portion is provided. Or, by providing the axial notch on both, the fitting portion is sufficiently bent in the radial direction,
Assembly can be performed easily.

(2) In the backflow prevention device according to the second aspect, wherein the valve body and the elastic portion are accommodated in the casing having the valve seat and the valve body holding portion, the valve body holding portion has a radial cutout. Is provided, the fitting portion is sufficiently bent in the axial direction, and assembly can be easily performed. Further, since there is no continuous edge on the outer periphery of the frame suppressing portion, the water flow surface can be widened and the amount of water discharged can be improved.

(3) According to the third aspect of the present invention, by providing means for freely moving the engaging position between the valve body holding portion and the casing portion, the valve opening amount is adjusted even for the same member, and the region where the hydrostatic pressure is different is provided. However, the fluid pressure can be regulated.

(4) According to the fourth aspect, the display of the used water pressure, the used area and the like is provided at the hooking position, so that the flow pressure can be easily adjusted by adjusting the valve opening amount with reference to the display.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a backflow prevention device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is an exploded perspective view of a backflow prevention device according to a second embodiment of the present invention.

FIG. 4 is a front view of a backflow prevention device according to a third embodiment of the present invention.

FIG. 5 is an exploded perspective view of the same.

FIG. 6 is a sectional front view of a backflow prevention device according to a fourth embodiment of the present invention.

FIG. 7 is a front view of the same.

FIG. 8 is a front view of a backflow prevention device according to a fifth embodiment of the present invention.

FIG. 9 is a half sectional view of a backflow prevention device showing a conventional example.

[Explanation of symbols]

 1, 7, 29, 34, 37 Casing part 2, 4 Valve body part 3, 10, 25, 36 Valve body suppressing part 5, 8 O-ring groove 6, 9 O-ring 11 Valve body guide 12 Spring 13 Valve body shaft 14 Outflow side 15, 27 Rib 22 Outer edge 16, 28, 33, 39 Hooking pawl 17, 30, 35, 38 Hook groove 18 Seat surface (valve seat) 19, 31 Inflow side 20, 40 Valve body guide contact surface 21 Valve body contact surface 22 Edge 23 Insertion part 24, 32 Axial notch 26 Radial notch

Claims (4)

[Claims] In a backflow prevention device in which a valve body portion and an elastic portion are accommodated in a casing portion having a valve seat and a valve body holding portion, one or both of the casing portion and the valve body holding portion are provided with an axial direction. Backflow prevention device characterized by having notches. 2. A backflow prevention device in which a valve body portion and an elastic portion are accommodated in a casing portion having a valve seat and a valve body holding portion, wherein a radial cutout is provided in the valve body holding portion. Backflow prevention device. 3. The apparatus according to claim 1, further comprising means for allowing the engaging position between the valve body suppressing portion and the casing portion to be movable.
Or the backflow prevention device according to 2. 4. The backflow prevention device according to claim 3, wherein an indication of a use water pressure, a use area, and the like is provided at the hooking position.