JPS5842880A - Diaphragm device - Google Patents

Abstract

PURPOSE:To prevent a diaphragm from damage due to ozone, when a diaphragm device of various kind, used with a diaphragm of rubber, is used in contact to the air, by adsorbing or decomposing the ozone in the air through filter and providing the filter to the side of the diaphragm contacted to the air. CONSTITUTION:In case of applying a device to a gas governor and the like, a primary pressure chamber A, communicated to an inlet 1, and a secondary pressure chamber B, communicated to an outlet 2, are separated by a valve seat 3 and valve body 4, and the valve body 4 is connected to a diaphragm 5, then the diaphragm 5 is pressed and urged from the upper by a spring 6. Then a filter 10, filled with a meal oxide, is provided in a communication passage of an air chamber C to the outside. In this way, ozone of air, introduced into the air chamber C in accordance with operation of the diaphragm 5, can be removed by the metal oxide in the filter 10, and the diaphragm 5 is never suspicious to be deteriorated and damaged by the ozone.

Description

Detailed Description of the Invention The present invention aims to improve reliability by protecting the diaphragm from ozone in the air in a diaphragm device that controls, measures, or detects the pressure of a fluid by receiving the pressure of the fluid with a diaphragm. purpose.

The main components of the present invention include a diaphragm surface that comes into contact with air;
A filter that adsorbs or decomposes a small amount of ozone present in the air is provided in the path to the air passage hole, so that the ozone concentration in the air in contact with the diaphragm is maintained at an extremely low level.

Fig. 1 shows a well-known gas valve as a conventional example. An air chamber communicating with the atmosphere is formed through the pressure chamber A, the secondary pressure chamber opening, and the air passage hole 8. As is well known, even if the pressure in the primary pressure chamber A changes, the pressure at the secondary royal port set by the pressure adjustment screw 7 does not change.

A problem with this conventional example is that the diaphragm 6 facing the air chamber may be damaged by ozone in the air.

In other words, due to the principle of operation of this gas governor, it is necessary that the pressure in the air chamber/% remains constant even when the Diaphragm moves or the ambient temperature changes.
is in communication with the atmosphere through the air passage hole 8. This means that when the diaphragm 6 moves, that is, when the gas governor operates or the ambient temperature changes, the air inside the air chamber enters and leaves the outside air, and the ozone in the atmosphere flows into the air chamber.
63゜6o3' On the other hand, nitrile rubber is generally used as the material for the diaphragm of a gas governor in order to satisfy the various characteristics of a gas governor, and nitrile rubber has a high ozone concentration and is stretched. It is also generally known that Kiren will enter if you do so. Therefore, gas governors having a diaphragm in contact with air may be susceptible to damage due to this ozone, and appropriate countermeasures are desired.

Of course, this problem is not limited to gas governors, but also applies to pressure regulators, control valves, etc. whose diaphragms are used in contact with air.
This is a common problem with measuring instruments, detectors, etc. (hereinafter collectively referred to as diaphragm devices), and similar to gas governors, countermeasures are desired.

On the other hand, from a different perspective from the present invention, some ideas have been proposed, such as a method for detecting damage at an early stage when the diaphragm is damaged and closing the original pulp, and a method for sealing the pulp without having any holes for communication with the atmosphere. However, depending on the diaphragm device, it is not necessarily suitable due to characteristics, structural complexity, cost, etc.
For example, in the above-mentioned gas governor, the structure shown in the conventional example shown in FIG. 1 is still commonly used, although efforts have been made to improve reliability as much as possible in the design.

The present invention has a relatively simple configuration under the current circumstances, and is intended to eliminate ozone, which is the main cause of diaphragm damage, and further improve the reliability of the diaphragm.

An embodiment of the present invention is shown in FIG. Figure 2 shows conventional example cylinder 1.
In one embodiment of the present invention in the gas governor shown in 1.
Similarly to the figure, 1 is an inlet, 2 is an outlet, 3 is a valve seat, 4 is a valve body, 6 is a diaphragm, 6 is a spring, 7 is a pressure adjustment screw foot, - secondary pressure chamber A, secondary pressure chamber The mouth constitutes an air chamber. In FIG. 2 of the present invention, the air chamber C communicates with the atmosphere through an air passage hole 9 via a filter 10 through which air can pass. One layer of the filter is filled with metal oxide.

In this configuration, when the gas governor operates or the ambient temperature changes as described in the conventional example, the air in the air chamber breathes with outside air through the filter 10.

6-1 The air taken in from the outside air through this breathing action passes through the filter 10, and the minute amount of unstable ozone contained in the air is changed into relatively stable oxygen by the action of metal oxides, and at least ozone is almost removed and enters the air chamber C. And protects the diaphragm 6 from ozone. On the other hand, the secondary pressure chamber inlet side of the diaphragm 6 is filled with gas as fuel, and ozone does not act thereon.

FIG. 3 shows another embodiment of the invention. Figure 3 shows a gas governor in which the pressure at the outlet is made variable by electromagnetic force; 1 is the inlet, 0.2 is the outlet, 3 is the valve seat, 4 is the valve body, 5 is the diaphragm, and 11 is the electromagnetic granger.

12 is an electromagnetic coil, 9 is an air passage hole, and 10 is a filter. And - secondary pressure chamber A, secondary royal entrance.

An air chamber C is formed.

In this configuration, when the current flowing through the electromagnetic coil 12 is changed, the electromagnetic force generated in the electromagnetic plunger 11 is changed, and the force acting on the valve body 4 interlocked with the diaphragm 6 is changed. can be changed.

In this case as well, as in the embodiment shown in FIG. 2, the air chamber C communicates with the atmosphere through the air passage hole 9 through the filter, preventing ozone from entering the air chamber C and protecting the diaphragm 6. Especially in the 3N embodiment.

Generally, the electromagnetic force is frequently changed to control the outlet pressure, and the diaphragm 6 is operated many times, so there are many opportunities for breathing with the atmosphere, and the present invention is highly effective.

FIG. 4 shows, as another embodiment of the present invention, an example of a differential pressure detector in which the fluid is air. In Fig. 4, 6 is a diaphragm that operates in response to air pressure.

13 is a magnetic core that interlocks with the diaphragm 6; 14 is a group of coils that together with the magnetic core 13 constitute a differential transformer; the magnetic core 1;
Detect position 3. 10 is a filter, and 9 is an air passage hole. In the embodiment shown in FIG. 4, since both the high pressure chamber 2 and the low pressure chamber 4 are in contact with air, the filter 10 is used on both sides. In particular, in the embodiment shown in FIG. 4, the difference in pressure acting on both sides of the diaphragm 6 is generally very small;
It is not uncommon for it to be below mH2O. Therefore, the accuracy of the differential pressure detector is closely related to the rigidity of the diaphragm 6, and it is generally desired that the thickness of the diaphragm 5 be made as flexible as possible. Therefore, countermeasures against ozone are more important, and the effects of the present invention are significant.

In the embodiment shown in FIG. 4, an example of a differential pressure detector when the fluid is air is shown, and a case where air pressure acts on both sides of the diaphragm is explained. However, when detecting gas pressure, one side of the diaphragm is used. is in contact with gas.

The other side will be in contact with the air, so a filter only needs to be provided on the air side.

The effects of the present invention are applicable when various diaphragm devices using rubber diaphragms are used in contact with air, where there is a risk of causing ozone irritation.

The provision of a simple filter protects the diaphragm from ozone and significantly increases the reliability of the diaphragm device.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of a conventional example, and FIGS. 2 to 4 are explanatory diagrams of the configuration of each embodiment of the present invention. 6...Diaphragm, 10...Filter. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) A diaphragm device in which at least one side of a rubber diaphragm is in contact with the air, and a filter for adsorbing or decomposing ozone is provided on the side where the diaphragm is in contact with the air. (2) The diaphragm device according to claim 1, wherein the filter has a metal oxide as a main component.