JPH0493736A - Mechanism for detecting breakdown of sealing part of controller - Google Patents

Abstract

PURPOSE:To detect the breakdown of a sealing part readily by forming a hole in the outer surface of a controller for controlling the flow rate of fluid, and attaching leakage detecting member. CONSTITUTION:A hole 13 is formed in the outer surface of a diaphragm valve 1, which is a controller for flow rate, and communicated to a gap 12 in the valve 1. A leakage detecting member 14 is attached to the hole 13. The member 14 is formed of a tubular body 15 and a rod-shaped body 17. An inner part 18 of the tubular body 15 is made hollow as shown on the Figure (A), and the rod-shaped body 17 is inserted. When a diaphragm 5 of the valve 1 is broken by some cause and the fluid leaks into the gap 12 between a body 10 and a bonnet pushing piece 8, the fluid filling the gap 12 flows into the inner part 18 of the tubular body 15 and pushes the rod-shaped body 17. A tip part 17c is protruding to the outside of the tubular body 15 as in the Figure (B). The breakdown of the diaphragm 5 which is the sealing part of the valve 1 can be detected by visually recognizing this state.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a seal damage detection mechanism for a controller. To provide a seal breakage detection mechanism for a controller that promptly detects leakage to the outside due to breakage or the like.

(Prior Art and its Problems) An example of a controller, such as a diaphragm valve, is one having the structure shown in FIG.

This diaphragm valve consists of a handle (a), a valve stem (b), a diaphragm holder (C), a diaphragm (d), and a valve body (e).
), bonnet (f), bonnet holder (g), spring (h), and body (1).

To close the valve, turn the handle (a), the valve stem (b) descends and is deformed by the pressure of the diaphragm (d) or valve stem (b), and along with this, the valve body (e) or spring (h) resists. and descends to block the flow path 1).

To open the valve, turn the handle (a) in the opposite direction to the above case to raise the valve stem (b), and the elastic force of the spring (h) will also raise the valve body (e), opening the flow path (). ) is opened, and the diaphragm (d) also returns to its original shape by being pressed by the valve body (e).

In the example shown in FIG. 7, the valve is in an open state, and the fluid flowing through the pipe flows through the flow path (j) of the hotty (1).

By the way, some of the fluid flows through the valve body (e) and the spring receiver (
It also flows into the spring storage space <p> in the body i (i) through the gap with the spring k).

This fluid is normally blocked by a diaphragm (d), which is a seal, and does not flow out of the body (1).

However, if this diaphragm (d) is damaged for some reason, such as fatigue due to long-term use, fluid will leak from that part.

The leaked fluid is contained in the honnet (f) and honnet presser foot (g).
It leaks to the outside from the gap between the two or from the leak check hole (m) (indicated by a broken line) formed in the bonnet holder (g).

Such leakage not only prevents the normal flow of fluid, but can also be extremely dangerous if the fluid is a toxic gas or combustible gas.

Therefore, if the above-mentioned fluid leak occurs, is it necessary to immediately detect it and replace the damaged parts? Conventionally, there was no means to quickly detect damage to the seal part of the controller.
In order to prevent fluid leakage due to damage to the seal, measures were taken such as making the diaphragm double-layered.
There was a problem with not being able to tell if it was the diaphragm in the third stage or if it was damaged.

There has been a desire in the industry to create a mechanism that can quickly detect damage to the seal (diaphragm) of a controller.

(Means for Solving the Problems) The present invention provides a seal breakage detection mechanism comprising a hole formed on the outer surface of a controller for controlling the flow rate of fluid and a leakage detection member attached to the hole. The hole communicates with a cavity in the controller, and the leak detection member is composed of a cylindrical body attached to the hole and a movable member or a pressure sensor provided on the cylindrical body, and is either the leak detection member or the movable member. In this case, the cylindrical body is moved outwardly by the pressure of the fluid filled in the gap in the controller, and in the case of a leak detection member or a pressure sensor, the gap in the controller is moved outwardly. A seal breakage detection mechanism for a controller is characterized in that it is capable of sensing the pressure of a fluid filled with the fluid and transmitting the signal to the signal generator, wherein the movable member is a cylindrical body and the cylindrical body. A signal generating device external to the controller by providing an electrical contact point between the movable member and its vicinity. The above problem is solved by a structure that communicates with the.

(Function) When the seal inside the controller is damaged, fluid leaks out of the seal, and when this fluid fills the gap inside the controller, the fluid also flows into the hole formed on the outer surface of the controller.

The pressure of the fluid flowing into the hole also applies fluid pressure to the leak detection member attached to the hole.

If the leak detection member is a cylindrical body and a rod-shaped movable member provided inside the cylindrical body, the fluid pressure causes the rod-shaped movable member to protrude outside the cylindrical body, that is, to the outside of the hole, thereby sealing the seal. Damage can be detected visually.

If the outer side of the rod-shaped body is colored, visual inspection becomes easier.

When the movable member is a cylindrical body and an elastic expansion/contraction body connected thereto, breakage of the seal portion can be visually detected by the opening of the elastic expansion/contraction body extending due to fluid flowing into the cylindrical body.

Control is achieved by providing electrical contacts on the movable member and its vicinity so that when the movable member moves under fluid pressure, both of the contacts come into contact with each other, so that both of the contacts come into contact in the event of fluid leakage. Damage to the seal can be detected even at a location far from the controller by a signal from a signal generator outside the device.

If the leak detection member is a pressure sensor, this pressure sensor senses the fluid pressure and transmits it to the signal generator, and it is possible to detect whether the seal portion is damaged or not based on the signal from the signal generator.

(Example) Hereinafter, an example of the seal breakage detection mechanism of a controller according to the present invention will be described with reference to the drawings.

In FIG. 1, (1) shows a diaphragm valve which is a controller developed by the present invention;
) is a handle (2), a valve stem (3), a diaphragm holder (4), and a tire flam (5) as described in the explanation of the prior art.
), valve body (6), bonnet (7), bonnet holder (
8), a spring (9), and a body (10).

As described above, the flow path Ql) is opened and closed by moving the valve body (6) up and down by operating the handle (2).

An O-ring (28) (2
9) or intervening.

A hole qλ communicating with the gap qz in the diaphragm valve (]) is formed on the outer surface of the diaphragm valve (1), in this embodiment the outer surface of the bonnet retainer (8), and a female thread is formed on the inner periphery of this hole 0λ. (13a) is formed.

A leak detection member 04) is attached to the hole 03.

Below, each aspect of the leak detection member G4) is shown in Fig. 2 (A).
This will be explained with reference to FIGS.

Figure 2 (A) and (B) show the leak detection member (I4).
A first embodiment of the invention is shown.

Leakage detection member Q4) consists of a cylindrical body q9 and this cylindrical body (]5)
In this example, the movable member is a rod-shaped body q force.

A male thread (15a) is formed on the outer periphery of the proximal end of the cylindrical body Q9 to be screwed into the female thread (13a).

The interiors qe of these q cylindrical bodies are hollow, and the large-diameter portion (18a
) and a small diameter portion (18b) are formed.

The rod-shaped body q force is inserted into the cylindrical body q9, and this rod-shaped body G force is inserted into the large-diameter base (17a) of the piston or the large-diameter portion (18a) of the cylindrical body q9. piston rod (
17b) is inserted through the small diameter portion (18a).

The piston rod (17b) is made longer than the small diameter portion (18a), and is initially inserted halfway into the small diameter portion (18a).

A ○ ring q■ is fitted on the outer periphery of the piston rod (17b), and this 0 ring 09 is brought into contact with the inner surface of the cylindrical body (19) to connect the inside of the cylindrical body LIP and the tire flam valve (
1) The outside is airtight.

The rod-shaped body q′7) is connected to the small-diameter portion (1, 8b) of the cylindrical body Gω.
) is movable in the longitudinal direction.

Next, to explain the operating state of the leak detection mechanism according to this embodiment, first, the diaphragm (5) of the diaphragm valve (1)
When the fluid leaks from the damaged part into the gap Q between the body (IQ) and the bonnet presser (8), the gap (12) gradually fills with the fluid.

This fluid also flows into the interior q& of the cylindrical body q9 and enters the rod-shaped body 0.
The base (17a) of 71 is pressed to push this rod-shaped body (171) out of the cylindrical body q9.

As a result, as shown in FIG. 2(B), the tip (17c) of the piston rod (17b) of the rod-shaped body opening η is projected to the outside of the cylindrical body o9.

By visually confirming the state in which the piston rod (17b) protrudes from the cylindrical body G9, the diaphragm valve (1)
It is possible to detect fluid leakage from the diaphragm (5), that is, damage to the diaphragm (5), which is the sealing part.

Furthermore, if the tip (17c) of the piston rod (27b) is colored red or the like, it will be easier to notice if the tip (17C) protrudes.

3A and 3B show a second embodiment of the leakage detection mechanism, and in this example, the outer periphery of the piston rod (17b) of the rod-shaped body 07) and the tip of the cylindrical body 15) are shown. An electrical contact (21) is provided on the inner periphery.

Both these contacts (20+(21,)
It is connected to the.

To explain its operating state, first, as mentioned above, when the gap G is filled with fluid and the rod-shaped body 17+ or the cylindrical body (1511) is pressed outward, the position shown in FIG. 3(B) is Contact α
l (21) or contact.

Then, the wiring (22) is energized and a predetermined signal is transmitted from the signal generator (23).

This makes it possible to detect damage to the seal at a location away from the controller (diaphragm valve).

A third embodiment is shown in FIGS. 4(A) and 4(B), in which the movable member is an elastic expansion/contraction body (24) connected to the cylindrical body OSl. The cylindrical body 09 of the member 0.1) has a male screw (15a) on the outer periphery and has no step on the inner surface, and the elastic expansion/contraction body (24) is connected to the tip thereof.

This elastic expansion/contraction body (24) may be any member that expands when fluid enters inside, or may be a balloon-shaped member.
In this embodiment, a resin or metal alloy is used.

This elastic expansion/contraction body (24) is in a contracted state during normal times, and the hole 13 is closed by this elastic expansion/contraction body (24).

To explain the operating state of the leakage detection mechanism in this embodiment, first, when the gap Oz is filled with fluid due to fluid leakage as described above, the leakage detection member G4) is filled with fluid, and the elastic expansion and contraction occurs. The body (24) is compressed from within to stretch it.

This expansion causes the elastic expansion and contraction body (24) to expand as shown in FIG.
), and if you visually check this, you can detect if the seal is damaged.

5(A) and 5(B) show a fourth embodiment, and in this example, electrical contacts are provided at the tip of the elastic expansion/contraction body (24) and a wall (25) provided in the vicinity thereof. ■(21) is provided.

Both contacts (21) are connected to a signal generator (23) outside the diaphragm valve (1) via wiring (22).

Note that (28) is ground.

In this example, when the elastic expansion/contraction body (24) expands due to fluid pressure as described above, both contacts (21) come into contact and become energized, as shown in FIG. 5(B), and the signal generator (
23) A signal is generated, and by visually checking this signal, it is possible to detect whether the seal is damaged.

A fifth embodiment is shown in FIG. 6, and in this example, a cylindrical body 05) and a cylindrical body 05) are used as the leak detection member G4).
A pressure sensor (26) installed inside the pressure sensor (26) is employed.

The pressure sensor (26) is installed inside the cylindrical body 15), and the wiring (27) extending from the pressure sensor (26) or the signal generator (
23).

To explain its operating state, when fluid flows into the cylindrical body +19 and fluid pressure is applied to the pressure sensor (26), the pressure sensor (26) senses this and generates an electric signal as a signal generator (23). Damage to the seal can be detected by the signal transmitted from the signal generator (23).

In each of the embodiments described above, the controller (diaphragm valve)
1)) Connect the hole q3 formed on the outer surface to the leak detection member 04)
It can be used as a leak check hole in the product manufacturing process before installation of the hole q3, and in this way, it is possible to check for defective products by letting fluid flow in through the hole q3 and checking whether fluid comes out from the flow path at+.

Furthermore, in the second, fourth, and fifth embodiments, fluid leakage can be quickly dealt with by connecting the electrical contact (21) to a monitoring or alarm system by wiring.

(Effects of the Invention) The present invention provides a seal breakage detection mechanism comprising a hole formed on the outer surface of a controller for controlling the flow rate of fluid and a leakage detection member attached to the hole, wherein the hole is connected to the controller. The leak detection member includes a cylindrical body attached to the hole and a movable member provided on the cylindrical body, and the movable member communicates with the fluid filled in the cavity in the controller. The seal breakage detection mechanism of the controller is characterized in that it is movable to the outside of the cylindrical body by the pressure of the controller, so that the following effects are achieved.

In other words, even if the fluid from the flow path of the controller breaks the seal inside the controller, it will not leak to the outside, and the pressure of the fluid will cause the movable member to protrude to the outside of the cylindrical body. Damage to the seal can be detected easily and quickly by visual inspection, and subsequent measures can be taken quickly.

Furthermore, if the movable member is a rod-shaped body and its tip is colored, it will be easier to notice the protrusion of the rod-shaped body when the seal part is damaged.

If you adopt a configuration in which electrical contacts are provided on the movable member and its vicinity so that they come into contact when the movable member moves in response to fluid pressure, or a configuration in which a pressure sensor is provided inside the cylindrical body, the electrical contact point can be placed in the vicinity of the controller. Sole damage can be detected via a signal generator located at a location, and seal damage can therefore be centrally managed at one location.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view showing a controller showing a seal damage detection mechanism according to the present invention, and FIG. 2(A) is an enlarged view of the seal damage detection mechanism according to the first embodiment of the invention. 2(B) is an enlarged sectional explanatory view showing its operating state; FIG. 3(A) is an enlarged sectional explanatory view of the seal damage detection mechanism according to the second embodiment; FIG. ) is an enlarged cross-sectional explanatory view showing its operating state, FIG. 4(A) is an enlarged cross-sectional explanatory view of the seal breakage detection mechanism according to the third embodiment,
B) is an enlarged cross-sectional explanatory diagram showing its operating state, FIG. 5(F) is an enlarged cross-sectional explanatory diagram of the seal breakage detection mechanism according to the fourth embodiment, and FIG. FIG. 6 is an enlarged cross-sectional explanatory view of a seal breakage detection mechanism according to the fifth embodiment, and FIG. 7 is a partially cross-sectional front view showing an example of a conventional controller. (1)...Diaphragm valve (controller) qz...Void
q3 Hole Op/Leak detection member 09
...Cylindrical body 0 force...Rod-shaped body (2 [) (21
)...Contact (23)/Signal generator (24)...
・Elastic expansion/contraction body (26) pressure sensor

Claims (6)

[Claims] (1) A seal breakage detection mechanism consisting of a hole formed on the outer surface of a controller that controls the flow rate of fluid and a leak detection member attached to the hole, the hole communicating with a gap in the controller. , the leakage detection member is composed of a cylindrical body attached to the hole and a movable member provided on the cylindrical body, and the movable member is moved into the cylindrical shape by the pressure of the fluid filling the gap in the controller. A seal breakage detection mechanism for a controller characterized by being movable outward from the body. (2) The movable member is a rod-shaped body inserted into a cylindrical body,
2. The seal breakage detection mechanism for a controller according to claim 1, wherein the rod-shaped body is capable of being projected outward from the cylindrical body by the pressure of the fluid filling the gap in the controller. (3) The seal breakage detection mechanism for a controller according to claim (2), wherein a portion of the rod-shaped body closer to the outside of the cylindrical body is colored. (4) The movable member is an elastic expansion/contraction body connected to the cylindrical body, and the elastic expansion/contraction body is changed from a contracted state to an extended state outward from the cylindrical body by the fluid filling the gap in the controller. The seal breakage detection mechanism for a controller according to claim 1, wherein the mechanism is capable of being deformed into a shape. (5) Electrical contacts are provided on the movable member and in the vicinity of the movable member, both contacts are electrically connected to a signal generating device outside the controller, and both contacts are provided in the air gap inside the controller. The seal breakage detection mechanism for a controller according to claim 1, wherein the movable member is made contactable by movement of the movable member due to the pressure of the fluid filled with the controller. (6) The leak detection member is a pressure sensor, and this pressure sensor is installed in a hole on the outside of the controller and electrically communicated with a signal generator outside the controller. The seal breakage detection mechanism for a controller according to claim 1, wherein the mechanism is capable of sensing the pressure of the fluid filling the gap and transmitting the signal to the signal generating device.