JPH0384273A - Mounting method for resin part - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a damage and to prevent leakage of internal fluid through a mounting part to the valve body of a resin part by a method wherein the resin part is uniformly pressed against a valve body by means of a mounting member made of a metal to prevent concentration of a stress to a part of the resin part. CONSTITUTION:A resin part (cut off valve cover) 8 is arranged in a position at a valve body 1. By pressing at least a part of the resin part 8 against the valve body 1 through the medium of a mounting member 12 made of a metal. The resin part 8 is secured in a position at the valve body 1. This method prevents deformation and breakage of the resin part 8 through prevention of concentration of a stress to a part of the resin part 8, and prevents leakage of internal fluid through the mounting part of the resin part 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for attaching resin parts to a valve that partially includes resin parts, such as a water valve for a water heater.

[Prior Art] For example, when a conventional water stop valve cover for a water heater water valve is made of resin such as polyacetal resin and is attached to the water valve body, the water stop valve cover is assembled by the method shown in Fig. 3. was being installed. That is, a water stop valve diaphragm 2 and a water stop valve seat 3 are placed inside a water valve body 1 made of brass.
, a pilot valve 4, a pilot valve spring 5, a pilot valve spindle 6, a spindle guide 7, etc. When attaching a water stop valve cover 8 made of resin to a water valve having a known configuration, a hole is formed in the water stop valve cover 8. 9 was provided, and the water stop valve cover 8, which is a resin part, was attached to the water valve body 1 by passing through the hole 9 and screwing a set screw 10 into a screw hole 11 formed in the water valve body 1. .

[The problem that the invention attempts to solve I! ! ] However, with the conventional installation method, stress concentration occurs near the hole for the female screw formed in the resin water stop valve cover, causing deformation and cracking of the water stop valve cover, resulting in problems with the strength of the resin parts. In addition, due to the high pressure of the internal fluid, there were functional problems such as leakage of the internal fluid from the mounting of the resin parts.

This invention solves the above-mentioned problems, and it is possible to install resin parts by eliminating strength problems such as deformation and cracking of resin parts, and without functional problems such as internal fluid leakage. Our goal is to provide a method.

[Means for Solving the Problems] A method for attaching a resin part according to the present invention is as follows: a tM resin part is placed at a predetermined position on a valve body, and at least a part of the resin part is attached via a metal member. The resin part is fixed at a predetermined position of the valve body by pressing against the valve body.

[Function] The metal mounting member presses the resin part evenly against the valve body to prevent stress concentration, thereby preventing stress concentration on a part of the resin part and preventing deformation and cracking of the resin part. Additionally, the attachment of the plastic parts prevents leakage of internal fluids from the parts.

[Examples] Examples of the present invention will be described below based on the drawings. 1st
The figure is a partial cross-sectional view of the vicinity of the pilot valve of the water valve of a gas water heater showing an embodiment of the present invention, and Fig. 2 is a plan view showing the metal mounting members used in the embodiment of the present invention. . As shown in Fig. 1, inside the water valve body 1 made of brass, there is a water stop valve diaphragm 2 for opening and closing the water supply channel, a water stop valve seat 3, and a force required to open and close the water stop valve diaphragm 2. Components such as a pilot valve 4, a pilot valve spring 5, a pilot valve spindle 6, and a spindle guide 7 are housed in order to reduce the amount of water, and the opening 1a of the water valve body 1 that houses these components is made of polyacetal resin. Water stop valve cover 8, which is a resin part molded with
The pilot valve spindle 6 passes through this water stop valve cover 8 and is linked to a pilot valve operating section (not shown). The water stop valve cover 8 has a second
An annular fitting made of stainless steel plate, whose plan view is shown in the figure, is fixed to the water valve main body 1 by means of a member 12. In other words, when installing the water stop valve cover 8, metal installation is performed using member 1.
Insert the set screw 10 into the hole 13 provided around 2,
A screw hole 1 formed with this female screw 10 in the water valve body 1
The metal fitting of the water stop valve cover 8 is carried out by pressing and fixing the water stop valve cover 8 to the water valve main body 1 using a member 12 by screwing the water stop valve cover 8 into the water valve body 1 . In this way, when the water stop valve cover 8 made of resin is attached to a metal member, its peripheral portion is evenly pressed against the water valve body 1 by the member 12, and stress is concentrated on a part of the water stop valve cover 8. Since the water stop valve cover 8 is sufficiently pressed against the water valve body 1, even if the water pressure inside the valve is high to a certain extent, water leakage may occur from the installation. There is no such thing.

In the above embodiment, the case where the resin part is a water stop valve cover has been described, but the present invention is not limited to this, and other parts of the water valve, for example, the cover of the water valve that controls the supply of water, It can also be used when attaching a water valve cover etc. made of resin to the water valve body, and can also be applied to attaching resin parts other than water valves, such as gas valves. be. Furthermore, the type of resin material is not limited to polyacetal resin, but can be applied to parts made of polyamide resin and other various materials.

Further, the material of the metal mounting member may be any material having the necessary strength, and various metal materials such as iron plate, brass plate, etc. can be used.

Furthermore, the shape of the metal mounting member is not limited to the above embodiments, and may be partially annular or composed of multiple members, or may be of any other shape as necessary. .

[Effects of the Invention] The resin part mounting method of the present invention is configured such that the metal mounting member uniformly presses the resin part against the valve body to prevent stress concentration. Damage such as cracking of the resin parts due to concentration of stress in one part can be prevented, and the attachment of the resin parts to the valve body can effectively prevent leakage of internal fluid from the parts.

[Brief explanation of drawings]

Fig. 1 is a partial cross-sectional view showing an embodiment of the present invention, Fig. 2 is a plan view showing a member for attaching metal parts according to the present invention, and Fig. 3 is a partial cross-sectional view showing a conventional method for attaching resin parts. It is a diagram. 1...Water valve body, 8...Water stop valve cover, 12...Metal mounting parts

Claims (1)

[Claims] In a method of attaching a resin part to a valve, such as a water valve, in which part of the resin part is used, the resin part is arranged at a predetermined position in a valve body, and at least a part of the resin part is attached to a metal part. A method for attaching a resin part, characterized in that the resin part is fixed at a predetermined position on the valve body by pressing the resin part against the valve body through a member.