JPH039560Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a lift-type quick-close reversible device in which a valve body is pressed in the axial direction by a coil spring against a valve seat provided in a valve box, causing a quick closing operation. Regarding stop valves.

[Prior art]

Various such lift-type quick-close check valves are known. However, in the prior art, it is relatively difficult to know from the outside whether the check valve is open or closed.

That is, in a lift type check valve, since the valve stem is housed in the valve box, there is no means for confirming the position of any component of the check valve from the outside. For example, it is practically impossible to construct a part of the valve body from a transparent material. As a result, it was not possible to confirm whether the check valve was in an open state due to foreign matter being caught in the valve, malfunction of the valve stem, or the like.

It is known to use proximity switches to detect the position of working parts. However, when trying to detect the position of the valve body of a check valve using a proximity switch, the operating range of the proximity switch differs depending on the proximity switch, so the valve body is in the closed state (no water supply state). Even if you try to detect it, it will be judged as closed even if it is slightly open.

For example, Japanese Unexamined Patent Application Publication No. 55-6074 discloses a check valve that is provided with a detection mechanism for detecting a valve body and can detect whether the valve is opened or closed. However, in such known technology, since the detection mechanism is inserted through a screw hole, it is difficult to finely adjust the position, that is, the length of the protrusion, and it cannot be fixed at a specific position without loosening due to vibration of the piping system. Have difficulty. Therefore, responsiveness is not necessarily good. In addition, screw penetrations are difficult to seal and are prone to leakage.

[Problem to be solved]

Therefore, an object of the present invention is to provide a lift-type quick-close check valve in which a proximity switch, which is a means for detecting the opening and closing of a valve body, can be correctly positioned and which is free from the risk of water leakage.

[Means to solve the problem]

According to the present invention, the valve body is pressed in the axial direction by the coil spring against the valve seat provided in the valve box,
In lift-type quick-closing check valves that are quickly closed by a lift mechanism, a proximity switch is attached to the valve body radially outward of the position where the valve body seats on the valve seat, and the sensitive part of the proximity switch is attached to the valve body. and the proximity switch is housed in a removable resin cap that extends radially inwardly through a mounting hole formed in the valve body and extends radially inwardly from the outer end of the mounting hole. The flange of the proximity switch is fixed to the valve box with bolts through shims at the mounting part of the valve body, and the mounting hole and the side surface of the cap are sealed with O-rings, and the valve body is fixed to the valve body with bolts through shims. The sensitive body is configured to be sensitive to the sensitive part of the sensor.

[Function and effect of the idea]

Therefore, when the valve body opens and closes, the sensing part provided on the valve body also moves in the axial direction of the valve stem, but when the valve body is in the valve closing position, that is, when the valve body is seated on the valve seat. , the proximity switch may be positioned by adjusting the shim to a position where the proximity switch detects the sensitive part. In this manner, the proximity switch operates only when the valve body is in the valve-closed position, so that it is possible to reliably detect from the outside that the valve is closed. The proximity switch is installed in the valve body radially outward of the valve seat and is sealed with an O-ring, so even if it is moved slightly inward or outward in the radial direction by shims, the connection between the valve body and the proximity switch will be maintained. There is no effect on the seal between the two. Therefore, according to the present invention, it is possible to reliably know whether the valve is closed or not based on the signal from the proximity switch, and the operation of the valve itself is not affected in any way. Therefore, it is possible to accurately detect a non-water supply (flow cutoff) state in which the valve body is seated on the valve seat, and a non-water supply contact mechanism can be achieved simply and inexpensively.

Since the proximity switch is detachably housed in a resin cap, the side surface of the cap and the mounting hole can be sealed with an O-ring. Furthermore, there is no need to use any special proximity switch; instead, a commercially available product can be used, and the mounting hole of the cap can be machined to fit it.

[Preferred embodiment]

The sensitive body for the proximity switch is preferably provided on the outer circumferential wall of the valve body and configured to have an area commensurate with the sensitive area required by the proximity switch.
Furthermore, it is preferred that the mounting hole and the mounting portion of the proximity switch be machined so that the dimensions between the sensing element provided on the valve body and the sensing portion of the proximity switch are accurately defined. If the pick-up point of the proximity switch is fixed in this way, an extremely accurate detection effect can be achieved.

〔Example〕

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

In the drawings, a valve body, designated as a whole by the reference numeral 1, has an inlet 2 and an outlet 3, and can be connected to pipes (not shown) by flanges 4, 5, respectively. A check valve, generally designated by the symbol V, is provided between the inlet 2 and the outlet 3. The valve stem 6 of this check valve V is held by a bush 8 held by a bracket 7 extending downward from near the outlet of the outflow port 3 so as to be able to move up and down as shown in the drawing.

A valve seat 9 is provided above the inlet 2 formed in the valve box 1. On the other hand, the valve body 1 is attached to the lower end of the valve stem 6.
0 is set. A rubber sheet constituting a valve engaging portion 11 is fixed to the lower side of the valve body 10 with a nut 13 via a valve cover 12. A coil spring 1 is provided between the valve body 10 and the bush 8.
4 is interposed, and constantly presses the valve body 10 downward in the drawing. In the figure, 12a is an O-ring, and 13 is a bypass valve.

When liquid flows into the inlet 2 during operation, the liquid pressure acts on the valve body 10 and lifts the valve body 10 upward against the coil spring 14. Therefore, the valve stem 6 is guided by the bush 8 and moves upward, and the valve body 1
0 is located at the position indicated by the imaginary line 10a. The liquid can therefore flow from the inlet 2 towards the outlet 3. When the hydraulic pressure disappears, the valve body 10 rapidly moves downward by the action of the coil spring 14, and the rubber sheet 11 engages with the valve seat to close the flow path. All of the above belong to known techniques.

According to the present invention, a proximity switch 20 is provided in the valve body 1 radially outward from the position where the valve body 10 seats on the valve seat 9.
is installed. The proximity switch 20 includes a resin cap 21 that extends radially inward through a mounting hole 22 formed in the valve body 1, and a mounting portion 23 at the outer end of the mounting hole 22. At this point, the proximity switch 20 is connected via the shim 24.
A flange 26 is fixed to the valve body 1 by bolts 25. The sensitive part 27 of the proximity switch 20 is housed in the cap 21 and is located in the mounting hole 22.
and the side surface of the cap 21 are sealed with an O-ring 28. On the other hand, the valve body 10 is provided with a sensitive body 29 so that the valve body 10 itself acts as a sensitive body for the proximity switch 20. Therefore, the proximity switch 20 is located within the lower edge of the valve body 10.
The point Z closest to is the detection part of the proximity switch 20.

The operating range of the proximity switch 20 is known in advance as shown by the broken line A. Therefore, the thickness of the shim 24 is adjusted so that the position of point Z in the valve closed position, that is, in the non-water supply state, is exactly on the line A, and the proximity switch is installed. The mounting portion 23 of the mounting hole 22 may be formed in advance to be slightly closer to the valve stem 6 and configured to be adjustable by changing the thickness of the shim. Even if there is an error in the length a in the axial direction between the center line O of the mounting hole 22 and the point Z, the proximity switch 20
Point Z can be located on line A by changing the length b in the radial direction between the sensitive portion 27 and point Z. Then, the signal from the proximity switch 20 may be displayed on any display section via the wire W.

The valve body 10 is configured to have a necessary and sufficient area as a sensitive body. Further, the sensitive body 29 may not necessarily be provided, and the valve body 10 may be configured as a sensitive body.

〔Effect of the invention〕

Since the present invention is configured as described above, it has the following effects.

(1) Since the position of the proximity switch is adjusted using shims, its positioning and fixation are reliable.

(2) Therefore, by making sure that the operating characteristic area of the sensing part of the proximity switch passes through point Z on the lower edge of the valve body, which is closest to the proximity switch, the valve closing position can be reliably determined. be able to.

(3) The sides of the cap are sealed with O-rings to reliably prevent liquid leakage.

(4) The closed state of the valve, that is, the state of no water supply, can be detected very easily without interfering with the function of the valve.

(5) Since the proximity switch is housed in the cap, a known commercially available proximity switch can be used as the proximity switch itself.

[Brief explanation of drawings]

The drawing is a sectional view showing an embodiment of the present invention. 9... Valve seat, 10... Valve body, 20... Proximity switch, 21... Cap, 24... Shim, 28...
...O-ring.

Claims (1)

[Scope of utility model registration request] In a lift-type quick-close check valve, in which the valve body is pressed in the axial direction by a coil spring against the valve seat provided in the valve box, and the lift mechanism quickly closes the valve, this is the radius of the position where the valve body seats on the valve seat. A proximity switch is attached to the valve box on the outside in the direction, the sensing part of the proximity switch is provided in a position close to the valve body, and the proximity switch is housed in a removable resin cap, and the cap is attached to the valve box. the flange of the proximity switch is secured to the valve body by bolts via shims at the mounting point at the outer end of the mounting hole; A lift-type quick-close check valve characterized in that the mounting hole and the side surface of the cap are sealed with an O-ring, and the valve body is configured as a sensitive body that is sensitive to a sensitive part of a proximity switch.