JPS58109779A - Gas pressure regulator - Google Patents

Abstract

PURPOSE:To avoid danger attendant with the breakage of a diaphragm, by a method wherein the change with time of a material constituting a diaphragm is electrically detected, so that the breakage of the diaphragm can be predicted. CONSTITUTION:An electrically conductive layer 7 is produced on a part or the entire part of the surface of the diaphragm 6 on the side of a primary chamber 2, another electrically conductive layer 9 is produced on the opposite surface of the diaphragm 6, and a circuit is constructed with the layers 7, 9 constituting one side of a bridge. When the material constituting the diaphragm 6 is craked or is swollen or damaged in other way due to a gas of a hydrocarbon, the electric resistance between the layers 7 and 9 is changed, the balance of the bridge is broken, and an output E thereof is increased. When the increase of the output E exceeds an allowable increase amount, the diaphragm 6 is replaced.

Description

[Detailed description of the invention] The present invention relates to a gas pressure regulating device.

In the conventional gas pressure regulating device shown in FIG. 4, gas flows in the direction of the arrow, and the diaphragm 16 is pushed upward by the pope P1, and the valve 16 interlocked with the diaphragm 16 is also moved upward at the same time, causing the gap 17f between the valve parts. The specifications of each bt part are determined so as to reduce the pressure to a predetermined pressure drop ΔP and obtain a set pressure P2 of P2 = Pl - ΔP. Now, paying attention to the diaphragm 16, the diaphragm has both the role of generating a force to move the valve 16 upward in response to the first valve P1 as described above, and the role of a seal to prevent gas from leaking to the outside. However, if the diaphragm 16 were to break, there is a problem in that it is used in such a way that gas would inevitably flow out to the outside.

The present invention solves the above-mentioned conventional problems, and aims to detect changes in the diaphragm over time and avoid dangers associated with breakage of the diaphragm 4.

The present invention provides a gas pressure regulating device having a diaphragm.
Four layers of gold are formed on both sides of the diaphragm, and the electrical properties between the gold layers are detected. As the deterioration of the diaphragm progresses, the physical properties of the diaphragm material will change, and the electrical properties will also change, so the degree of deterioration can be indirectly monitored by monitoring the electrical properties.

By replacing parts before the diaphragm breaks, risks associated with damage can be avoided.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

Gas flows in the direction of the arrow. It enters a primary chamber 2 from an inlet 1, passes through a gap 3 in the valve section, enters a secondary chamber 4, and reaches a combustion section (not shown) from an outlet 6. A conductive layer 7 is formed on a part or all of the surface of the diaphragm 6 on the primary chamber 2 side, for example, by using vapor deposition or other means, and a part of the conductive layer 7 is brought into conduction with the casing part 8 of the pressure regulating device. On the other hand, another conductive layer 9 is formed on the opposite surface of the diaphragm 6 to face the conductive layer 7, and the conductive layer 9 and the housing portion 8 are kept in an electrically insulated state. ,
The terminal 1o, which is insulated from the housing part 8, and the conductive layer 9 are connected by a flexible conductor 11, so that the conductive layer 9 and the terminal 10 are electrically connected. On the other hand, the θ terminal 12 is installed in a conductive state with the 1′V body portion B so that the conductive state with the conductive layer T can be maintained.

Also, the - of the bridge between the two terminals 10 and 12 is appropriately selected so that the output E is minimized. After the diaphragm 6 is molded, it is aged for a certain period of time, and after it is assembled into a pressure regulating device, the pressure regulating device is further aged, and then the above-mentioned R1 to R5 are adjusted.

If the material of the diaphragm 6 cracks due to ozone or swells due to hydrocarbon gas, both conductive layers 7
．． 9 changes, the balance of the bridge is lost, and E increases. By separately determining the relationship between the resistance change of the diaphragm 6 and the relationship between material deterioration, E
It is possible to set the allowable increase amount.

When X exceeds the allowable increase amount, it means that the diaphragm has deteriorated, so replacing the entire pressure regulating device or parts such as the diaphragm can prevent the risk of gas leakage due to damage to the diaphragm 6. Next, I created a circuit 13 that turns on when the input voltage e of the gate exceeds the allowable amount of the output E, and set the switch to 0N10F.
By providing the indicator 14 that operates in conjunction with F 2 , it is possible to monitor the state of deterioration of the diaphragm 6, and for the above-mentioned reason, it is possible to prevent gas leakage due to diaphragm damage.

Also, as shown in FIG. 3, the resistance R on each side of the bridge is
1, R2, R5 are constant, and the diaphragm is D-1, D
-2・・・・・・・・・By reading all the output voltages (200 pieces) at that time instead of D-N, it is possible to know the variation in the material between diaphragms in a non-destructive state, and the quality of the diaphragms can be stabilized. This can contribute to the safety of the vehicle, and as a result, damage is less likely to occur and safety can be increased.

As described above, according to the present invention, the following effects can be obtained.

(1) Changes in the material of the diaphragm over time can be monitored during use and can be predicted before breakage occurs, making it possible to prevent gas leaks due to breakage of the diaphragm.

(2) Since the material of the diaphragm can be inspected in a non-destructive state, it is easy to inspect for variations in diaphragm molding or non-uniformity in the mixture of rubber, which is the main material of the diaphragm, contributing to stabilization of quality. If quality can be stabilized, safety will also increase.

(3) By covering the entire side of the diaphragm that comes into contact with gas with a metal layer, contact between rubber and gas is avoided, the rate of rubber deterioration is slowed down, and durability is increased.

[Brief explanation of drawings]

Figure 1 is an elevational sectional view and bridge circuit diagram showing an example of a gas pressure regulator, Figure 2 is a display system diagram, Figure 3 is a diaphragm inspection circuit diagram, and Figure 4 is a conventional example of a gas pressure regulator. FIG. 6...Diaphragm, 7,9...Conductive layer, 14...Display device. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3e! U'l #! Figure 4

Claims (2)

[Claims] (1) A gas pressure regulating device configured to form conductive layers on both sides of a diaphragm, detect changes in electrical properties between the conductive layers, and monitor changes in the material of the diaphragm. (2) A claim that generates an electrical output corresponding to a change in the material of the diaphragm, and connects the electrical output to the input of an indicator that is adjusted to operate when a voltage exceeding a preset value is applied. The gas pressure regulating device according to item 1.