JPH04157220A - Spring and quick-closing check valve using it - Google Patents

Abstract

PURPOSE:To eliminate fatigue of a spring due to bending moment by separating at least one of hooks on both ends of a spring, from a main body holding it rotatably in the main body, and making the end of the main body from which the hook is separated smaller in diameter as it nears the tip of the main body. CONSTITUTION:The main body 2 of a spring 1 is provided with hooks 3 and 4. The hook 3 is made integrally with the main body and hook 4 is formed separately from the main body. One end 2a of the main body on the hook 4 side is made smaller in diameter as it nears the tip of the main body. The end 4a of the hook 4 is bent in S-shape and held in the main body 2 rotatably. According, even if a bending moment is applied to the spring, it is not subjected to fatigue due to bending moment since the hook 4 can make turning movement. The spring is used as an outer spring for giving turning movement to the valve body of a quick-closing check valve.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a coiled spring with hooks at both ends and a quick-close check valve using the spring.

1"" L4 The above-mentioned coil spring is well known, and its hook is locked between two members, giving an elastic action in the direction of bringing the two members closer to each other. This type of spring is used in a wide variety of ways.1 For example, in a quick-closing check valve installed in the middle of a water pipeline, it is used to quickly close the check valve to prevent backflow and water hammer. It is common to equip a spring with a spring. In this case, if the liquid flowing inside the water pipe is dirty water or corrosive, it is not possible to install a spring inside the valve, so the valve stem is extended outward and the valve stem is mounted outside the valve box. A spring is attached to the extension. This is called an external spring type quick-close check valve, and it is now widely used.

These external spring type quick-close check valves are usually configured such that the spring exerts a rotational moment on the valve stem via the spring lever arm.

The strong force of the spring acts on the contact point of the pin with the spring lever arm or rotating disk where the spring is engaged, and relative slippage occurs under the action of the above strong force each time the valve is opened or closed. As a result, wear occurs at the contact points, requiring the spring to be replaced after several months.

In order to solve such problems,
Publication No. 7 discloses an external spring type quick-close check valve that is equipped with a spring on the outside of the valve, and one end of the spring is locked to a pin provided on a rotating member fixed to the valve stem. It has been proposed that one end of this colored spring can be locked.

Problems to be Solved by the Invention In the above external spring type quick-close check valve, a collar is loosely attached to the pin and one end of the collar spring is locked, so that wear at the contact point is reduced.

Spring life is extended.

However, with the above external spring type quick-close check valve,
As shown in FIG. 8, one end of the spring 100, which is locked to the spring lever arm 101, is applied with a strong force to the pin 1.
02 as the center in the direction of arrow P, and the spring 1
A bending moment is added to 00. For this reason, the part of the spring 100 indicated by the symbol A becomes fatigued, and the spring 100 becomes fatigued.
00 was frequently damaged at the part indicated by A. Therefore, the external spring type quick-close check valve has a spring of 100
There was a problem in that the exchange cycle had to be changed for a short period of time.

The present invention solves the above-mentioned conventional problems, and provides a coil spring that does not become fatigued even with bending moments applied to the spring and can significantly extend its life, and a quick-close check valve using the spring. The purpose is to

Means to resolve issues The structure of the present invention that achieves the above object is as follows.

(1) In a coiled spring with hooks at both ends, at least one of the hooks and the spring body are separated, and one end of the spring body on the separated hook side is formed so that the diameter becomes smaller toward the tip. , a spring characterized in that one end of a hook separated within the spring body is rotatably held within the spring body.

(2) In a quick-closing check valve equipped with a coiled spring equipped with hooks at both ends on the outside of the valve, at least one of the hooks and the spring body are separated, and one end of the spring body on the separated hook side a spring formed to have a smaller diameter toward the tip and rotatably retains one end of a hook separated within the spring body; a pin provided on a rotating member fixed to the valve stem; 1. A quick-closing check valve using a spring, characterized in that the spring has a bearing attached to the pin, and a hook of the spring is locked to the pin via the bearing.

! - According to the structure of claim (1), at least one of the hooks is held rotatably with respect to the spring body, so that the hook can be rotated even in response to a bending moment applied to the spring. Since the spring is not subjected to excessive force, the bending moment applied to the spring does not cause fatigue, dramatically extending the life of the spring.

According to the structure of claim (2), the spring, which holds at least one of the hooks so as to be rotatable with respect to the spring body, is latched to the pin provided on the rotating member fixed to the valve stem via the bearing. By doing so, the life of the spring can be extended dramatically.

Example Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view of a spring according to the present invention.

In FIG. 1, reference numeral 1 indicates a coiled spring, 2 indicates the spring body, and 3 and 4 hooks. In this embodiment, the hook 3 on the right side in the drawing is integrally formed with the spring body 2, but the hook 4 on the left side in the drawing is separated from the spring body 2.

In this case, one end 2a of the spring body 2 on the hook 4 side is formed so that the diameter becomes smaller toward the tip. Further, the end portion 4a of the hook 4 is bent slightly, and the hook 4 is formed into a substantially S-shape as a whole. Then, the end portion 4a of the hook 4 enters into the spring body 2, and the hook 4 is rotatably held relative to the spring body 2.

In the spring 1 configured as described above, the hook 4 is rotatably held relative to the spring body 2, so even if a bending moment is applied to the spring, the hook 4 rotates and there is no space between the hook 4 and the spring body 2. No excessive force is applied.

Therefore, even if the spring 1 is used at a location where a bending moment is applied, the spring 1 will not be fatigued and its life will be extended.

FIG. 2 is an explanatory cross-sectional view of a quick-closing check valve using a spring according to the present invention.

In FIG. 2, reference numeral 10 is a check valve, and 11 and 12 are its valve body and valve body. As shown in FIGS. 3 and 4, a valve body arm 13 is fixedly attached to the valve body 12 and is fixed to a valve stem 15 by a stopper screw 14. As shown in FIGS. The valve stem 15 is rotatably and axially movably attached to the valve body 11 by a bearing bush 16. On the outside of the bearing bushing 16, a bushing retainer 17 is screwed into a plate 20 formed in a substantially diamond shape, and the plate 20 is fixed to the valve body 11. The above-mentioned bearing bush 16 is supported on this bush and presser foot 17.

An annular groove 18 is provided on the inner surface of the bushing holder 17,
A type 0 bucking ring 19 is inserted into this.

At the free end of the valve stem 15 protruding outward from the valve body 11,
The center of the spring lever arm 21 is fixed by a screw 22, and pins 23.
24 is provided protrudingly. In this case, each pin 23 , 24 is located on the same circumference around the axis of the valve stem 15 and is symmetrical about the axis of the valve stem 15 . In addition, each pin 23, 24 has a bearing 25 as shown in FIG.
is installed.

Fixing pins 26 and 27 are fixed to the plate body 20, and these fixing pins 26 and 27 are also located on the same circumference centered on the axis of the valve stem 15.

Then, the fixed pin 26, the pin 23 and the fixed pin 2
7 and pin 24 are provided with springs 1 according to the present invention shown in FIGS. 3 and 6, respectively. In this case, in this embodiment, the hook 4 is locked to the pins 23 and 24,
A hook 3 is engaged with the fixing pin 26, 27.

The two springs 1 are tension springs, and they work together to rotate the spring lever arm 21 counterclockwise. Therefore, a counterclockwise rotational moment is exerted on the valve stem 3, and this spring force is applied to the valve stem 15.
It is transmitted to the valve body 11 via the valve body arm 13, and acts to place the valve body 1 on its valve seat.

As described above, by using the spring 1 of the present invention in an external spring type quick-close check valve, the hook 4 is rotatably held relative to the spring body 2, so that it can withstand the bending moment applied to the spring 1. No fatigue and longer lifespan. Moreover, since the hook 4 is locked to the bearing 25 attached to the pin 23.24, the hook 4 and the bearing 25 rotate together around the pin 23.24, and the bending moment applied to the spring 1 is becomes smaller, and spring 1
The life of the quick-closing check valve itself is further extended, and it becomes longer than the life of the quick-closing check valve itself, making it unnecessary to replace the spring 1.

In the spring 1 of the present invention, as shown in FIG. 7, the hook 3 is also constructed in the same manner as the hook 4, and both ends 2a of the spring body 2 are also formed to have a smaller diameter toward the tip. , 4 may enter into the spring body 2 and be rotatably held relative to the spring body 2. Further, in the quick-closing check valve, a bearing 25 may also be attached to the fixing pin 26, 27, and the spring 1 may be locked through the bearing 25.

According to the above configuration, in the present invention, at least one of the hooks is rotatably held with respect to the spring body, so that the bending moment applied to the spring can be absorbed by the rotation of the hook. Therefore, no excessive force is applied to the spring.

Since the spring does not get fatigued by the bending moment applied to it, its life can be dramatically extended.

Furthermore, in the quick-closing check valve, a spring in which at least one of the hooks is rotatably held relative to the spring body is locked to a pin provided on a rotating member fixed to the valve stem via a bearing. , it is possible to dramatically extend the life of the spring.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a spring showing an embodiment of the present invention, Fig. 2 is a cross-sectional explanatory view of a quick-closing check valve using a spring according to the present invention, and Fig. 3 is an external spring type quick-closing valve. 4 is a front view of the exterior spring portion of the check valve, FIG. 5 is an enlarged sectional view of the pin portion in FIG. 3, and FIG. 6 is an enlarged view of the main part of FIG. 2. , FIG. 7 is a sectional view showing another embodiment of the spring according to the present invention, and FIG. 8 is a front view of a conventional exterior spring portion. 1...Spring 2...Spring body 3.4...Hook 10...Check valve 15...Valve stem 21... ... Spring lever arm 23.24 ... Pin 25 ... Bearing Fig. 4

Claims (2)

[Claims] (1) In a coiled spring with hooks at both ends, at least one of the hooks and the spring body are separated, and one end of the spring body on the separated hook side is formed so that the diameter becomes smaller toward the tip. , a spring characterized in that one end of a hook separated within the spring body is rotatably held within the spring body. (2) In a quick-closing check valve equipped with a coiled spring equipped with hooks at both ends on the outside of the valve, at least one of the hooks and the spring body are separated, and one end of the spring body on the separated hook side a spring formed to have a smaller diameter toward the tip and rotatably retains one end of a hook separated within the spring body; a pin provided on a rotating member fixed to the valve stem; 1. A quick-closing check valve using a spring, characterized in that the spring has a bearing attached to the pin, and a hook of the spring is locked to the pin via the bearing.