JP2000205447A - Check valve with opening display function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve with an opening display function capable of displaying valve opening in simple structure, that is, detecting an approximate flow rate. SOLUTION: A magnet 12 is installed on an outer peripheral side part of a check valve body 10. A reed switch 15 to detect magnetism of the magnet 12 is arranged on the side of a main body 2 facing against the magnet 12. It is possible to grasp an approximate flow rate by detecting an opening and closing valve moving position of the check valve body 10 by providing a plural number of the reed switches 15 in a moving area of the check valve body 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve which is attached to various kinds of fluid pipes such as steam, compressed air and liquid to permit a forward fluid flow but to close a reverse fluid flow. In particular, the present invention relates to a check valve having an opening display function capable of detecting a movement position of a check valve body, displaying a valve opening of the check valve body, and grasping an approximate flow rate flowing down the check valve.

[0002]

2. Description of the Related Art Conventional check valves include, for example, Japanese Utility Model Application
No. 0-10964. This is because the check valve body is formed in a disk shape and a projection is provided on the outer periphery thereof, and the outer end of the projection is slid on the inner peripheral wall surface of the valve casing, so that the flow of the fluid in the forward direction is allowed but the flow in the reverse direction is allowed. The fluid flow is closed.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
Although the function as a check valve can be surely performed, the flow rate flowing down the valve cannot be detected, and a flow meter must be attached separately from the check valve. However, there has been a problem that the mounting work becomes complicated.

Accordingly, an object of the present invention is to provide a check valve having an opening display function capable of detecting a flow rate with a simple structure.

[0005]

Means for solving the above-mentioned problems According to the present invention, an inlet and an outlet are formed in a valve casing, and a valve seat is provided between the inlet and the outlet.
In a check valve in which a check valve body is arranged on the outlet side of the valve seat and an elastic member for urging the check valve body toward the valve seat is attached, a magnet is mounted on an outer peripheral side of the check valve body. A magnetic detecting means for detecting the magnetism of the magnet is arranged on the valve casing side facing the magnet, and a plurality of the magnetic detecting means are provided within a moving range of the check valve body, and the magnetic detecting means is operated by the plurality of magnetic detecting means. It detects the moving position of the valve stop.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of magnetic detecting means are provided within a moving range of a check valve body in opposition to a magnet attached to the check valve body, so that the moving position of the check valve body can be controlled by a plurality of positions. It can be detected by the magnetic detecting means, and the open / closed valve state of the check valve can be detected. By detecting the open / closed state of the check valve, it is possible to grasp the outline of the flow rate flowing down the check valve, that is, whether the flow rate is high or low.

A so-called reed switch can be used as the magnetic detecting means for detecting the magnetism of the magnet, and the reed switch may be any one that can detect magnetism, such as a Hall IC or a proximity sensor.

[0008]

FIG. 1 is an overall structural view of a check valve having an opening display function according to the present invention. The inlet body 1 and the outlet body 2 form a valve casing. Inlet 4 connected to inlet body 1 and inlet pipe 3
And the outlet 5 is provided in the outlet body 2 so that the outlet pipe 6
Connect with

An annular valve seat 9 is provided at an end of the inlet main body 1,
A disc-shaped check valve body 10 is arranged on the outlet 5 side of the valve seat 9.
The check valve element 10 is large enough to cover the valve seat 9 and is urged toward the valve seat 9 by a coil spring 11 as an elastic member. The check valve causes the fluid from the inlet 4 to flow down to the outlet 5 side, but the flow on the opposite side, that is, the flow from the outlet 5 to the inlet 4 side is closed by the check valve body 10 sitting on the valve seat 9. Things.

A magnet 12 is provided on the outer peripheral side of the check valve body 10.
Attach. A guide member 13 is provided on the outer periphery of the magnet 12 so that the valve body 10 is slidably disposed in the main body 2. A plurality of reed switches 15 as magnetic detecting means are attached to the main body 2 facing the magnet 12. The reed switches 15 are arranged at equal intervals during a period from the closed state where the check valve body 10 is located on the valve seat 9 to the fully opened state on the outlet 5 side, and the open / close valve movement position of the check valve body 10 So that it can be detected.

The check valve 10 and the main body 2 are made of a non-magnetic material so as not to hinder the operation of the magnet 12 and the reed switch 15. Also, reed switch 15
Is connected to the simple flow indicator 14 so that the valve opening of the check valve 10 can be displayed. The simple flow indicator 14 displays zero percent when the position of the check valve 10 is closed on the valve seat 9 and displays 100 percent when the valve is fully open, based on the opening of the valve 10. It shows a simple flow rate.

In this embodiment, the inflow pipe 3 and the outflow pipe 6
The pressure sensors 7 and 8 are respectively attached to the sensors to detect a differential pressure before and after the check valve, and the flow rate flowing down can be more accurately detected from the differential pressure and the valve opening of the check valve body 10. To do.

A storage unit (not shown) is provided in the simplified flow rate indicator 14, and the relationship between the Cv value, which is the capacity coefficient of the check valve, and the valve opening degree of the check valve body 10, the Cv value and the before and after values of the valve. An equation for calculating the flow rate from the differential pressure is stored, and the flow rate can be calculated from the relationship between these storage units.

[0014]

By detecting the valve opening of the check valve with a plurality of magnetic detecting means, the valve opening can be displayed with a simple structure, that is, the approximate flow rate can be detected. A check valve can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a check valve having an opening display function according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inlet main body 2 Outlet main body 4 Inlet 5 outlet 9 Valve seat 10 Check valve 11 Coil spring 12 Magnet 14 Simple flow rate display 15 Reed switch

Claims (1)

[Claims] An inlet and an outlet are formed in a valve casing, a valve seat is provided between the inlet and the outlet, a check valve is disposed on an outlet side of the valve seat, and the check valve is a valve. In a check valve having an elastic member biased to a seat side, a magnet is attached to an outer peripheral side of a check valve body, and magnetic detecting means for detecting magnetism of the magnet is arranged on a valve casing side facing the magnet. A check valve with an opening degree display function, wherein a plurality of the magnetic detecting means are provided within a moving range of the check valve body, and a moving position of the check valve body is detected by the plurality of magnetic detecting means. .