JPH0329663Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a valve that is attached to a fluid piping to open/close a flow path and adjust the degree of opening, and particularly relates to a valve equipped with a structure for detecting the life of the valve. .

Valves of various types are used for a variety of purposes, but especially those used for medical purposes, nuclear power plants, chemical plants, etc., can cause serious accidents if they malfunction. , resulting in a loss.

Prior Art Conventionally, valve maintenance has been performed regularly and strictly. In other words, at predetermined intervals, such as once a year or once every six months, equipment and various plants were shut down and valves were overhauled and repaired. In addition, for valves that would have a particularly large impact in the event of a failure, a counter to count the number of operations and an hour meter to total the energization time were installed separately, and these were used to determine maintenance timing and lifespan. .

Problems that the present invention aims to solve In this case, regular maintenance involves maintenance of valves that are used infrequently and therefore have a low probability of failure, resulting in wasted maintenance costs. There was a problem that maintenance costs increased, and installing a counter and hour meter separately from the valve required new electrical wiring, which increased the equipment size.

Therefore, the technical problem of the present invention is to obtain a valve with a simple life detection structure.

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problems is to provide a flange on the valve shaft that rotates the valve body, and to arrange a sealing member on the upper surface of the flange. In the valve, a life detection member is disposed outside the valve stem via an elastic member, and at least the outer end of the valve stem and the life detection member are formed of a magnet and a magnet or a magnetic material that is attracted to the magnet. It is something.

Effect The operation of the above technical means is as follows.

When opening/closing or adjusting the degree of opening of the valve body,
Rotate the valve stem. The more the valve is operated, that is, the more times the valve stem is rotated, the more the sealing member wears, and the more the valve stem is displaced outwardly by the fluid pressure. Since at least the outer end of the valve stem and the life detection member are formed of a magnet and a magnet or magnetic material that is attracted to the magnet,
When the valve stem is displaced outward by a certain amount or more, a life detection member disposed outside the valve stem is attracted to the valve stem by magnetic force against the elastic force of the elastic member. By checking the movement of this life detection member, the number of valve operations, that is, the life span can be easily detected.

Effect of invention The present invention produces the following specific effects.

The present invention has a simple structure and can detect the lifespan of each valve, and based on the above detection, only valves that require maintenance can be maintained. Furthermore, by manufacturing the valve integrally with the valve, it can be manufactured at low cost and no new equipment is required.

Embodiment An embodiment illustrating a specific example of the above technical means will be described (see FIG. 1).

The valve casing is formed by a body 1 and an end piece 3 which is threadedly connected to the body 1. Inlet 4 to main body 1 and end member 3
An outlet 5 and a valve chamber 6 are provided to form a fluid passage.

A valve body 7 is rotatably arranged within the valve chamber 6. A through hole 8 and a guide hole 9 are formed perpendicularly to each other in the valve body 7, and a parallel keyway 10 is provided above the guide hole 9.

An annular valve seat 11 is provided on the inlet 4 side and the outlet 5 side of the valve body 7,
Place 12. Both valve seats 11 and 12 are liner 1
3 and 14, and is biased toward the valve body 7 by disc springs 15 and 16. O-rings 17 and 18 are arranged around the outer peripheries of both valve seats 11 and 12.

A bearing hole 19 and a holding hole 22 are formed in the main body 1, and a valve shaft 21 is placed in the holding hole 22 via a bush 23.

The valve shaft 21 is prevented from popping out by a holder 26 screwed to the valve casing. A gland seat 29 is arranged from the outer periphery to the lower surface of the flange 28 formed on the valve shaft 21, and biased toward the flange 28 by a liner 30 and disc springs 31, 32 arranged on the lower surface. Packings 34 and 35 are arranged on the upper surface of the flange 28 and the outer periphery of the valve shaft 21.

The upper end of the valve shaft 21 is connected to an operation source 33 such as a motor.
The output shaft 25 is connected to the output shaft 25 via a connecting rod 24.
A heat dissipation fin is formed on the outer periphery of the connecting rod 24, and a magnet 50 serving as a life detection member is disposed inside, and springs 51 and 52 are disposed above and below the magnet 50. A window 53 is opened in the connecting rod 24 so that the position of the magnet 50 inside can be seen. The valve stem 21 is made of SUS420F.

When the output shaft 25 is rotated, the connecting rod 24 and the valve shaft 21 are rotated, and the valve body 7 is opened and closed. As the number of rotations of the valve stem 21 increases, the packings 34 and 35 become more worn, and the valve stem 21 is further displaced outward by the fluid pressure. When the valve shaft 21 is displaced outward by a certain amount or more, the magnet 50 is attracted to the valve shaft 21 against the elastic force of the spring 52. By checking the movement of the magnet 50 through the window 53, the life span can be detected.

In this embodiment, the operation source unit 3 such as a motor
Although an automatic valve with 3 is shown, it can also be used with a manual valve. Although the life detection member is made of a magnet and the valve stem is made of a magnetic material, the life detection member may be made of a magnetic material and a magnet may be attached to the outer end of the valve stem.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a valve equipped with a life detection structure according to an embodiment of the present invention. 1: Main body, 3: End member, 4: Inlet, 5: Outlet,
6: Valve chamber, 7: Valve body, 8: Through hole, 11: Inlet annular valve seat, 12: Outlet annular valve seat, 19: Bearing hole,
21: Valve stem, 24: Connecting rod, 25: Output shaft, 5
0: magnet, 52: spring, 53: window.

Claims (1)

[Scope of utility model registration request] In a valve in which a flange is provided on the valve shaft that rotates the valve body, and a sealing member is arranged on the upper surface of the flange, a life detection member is disposed outside the valve shaft via an elastic member, and at least one of the valve shafts is A valve with a lifespan detection structure in which the outer end and the lifespan detection member are formed of a magnet and a magnet or magnetic material that is attracted to the magnet.