JPH0369880A - Fluid control valve device - Google Patents

Abstract

PURPOSE:To detect a leakage from one of a plurality valves connected in series, by forming a small diameter leakage detecting passage, in addition to a fluid main passage adapted to be opened and closed by a valve element, and by disposing a fluid detecting element in the leakage detecting passage. CONSTITUTION:A partition wall 2 is disposed in a casing 1 at a substantially center position, and a shut-off valve 4 is disposed in an opening 3 serving as a gas main passage. A small diameter leakage detecting passage 10 which is formed piercing through the partition wall 2, is disposed therein with a gas sensor 11 for detecting gas flowing through the passage 10. Such a kind of casings 1 are connected respectively to gas outlet ports 1b and gas inlet ports 1a. If a leakage occurs when the casings 1 are connected in series, it is detected through the respective leakage detection passages 10. Further, a leakage in from a previous stage casing 1 is determined, and accordingly, the casing 1 can be checked so as to easily repair the casing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fluid control valve device suitable for use as a proportional control valve or for opening/closing a fluid such as fuel gas in a combustion device or the like.

[Conventional technology]

In conventional combustion devices, gas leakage is prevented by providing two valves in series via a regulator valve in the gas passage to the main burner, pilot burner, etc.

[Problem to be solved by the invention]

As mentioned above, conventionally two valves are used to prevent gas leaks, but this is not perfect and a slight gas leak may occur, in which case it is necessary to reliably detect the gas leak. There were also problems such as not being able to determine which valve was causing the gas leak, and requiring time and effort to inspect and repair.

This invention was made in order to solve the above-mentioned problems, and when multiple valves are used, it is equipped with a leak detection function that can reliably detect which valve is causing gas leakage. It is an object of the present invention to provide a fluid control valve device.

[Means to solve the problem]

In this invention, a small-diameter leak detection flow path is provided separately from the main fluid flow path that is opened and closed by the valve body, and a fluid detection element is provided within this leak detection flow path.

[For production]

When the main flow path is closed, if there is a leak such as gas leak from another valve or the like, the fluid detection element in the leak detection flow path can detect this and display it.

〔Example〕

A first embodiment of the present invention will be described below with reference to FIG.

In Fig. 1, 1 is a case with gas inlets 1a at both ends.
and a gas outlet 1b.

2 is a partition plate provided to partition the inside of the case 1 approximately at the center; 3 is an opening provided in the partition plate 2 and serves as a main passage for gas; 4 is a valve body that opens and closes the opening 3; 5 is a valve body 3 6 is a piston rod provided on the valve body 4; 7 is a driving means for opening and closing the valve body 4;
In this embodiment, a solenoid device 7 is used. This solenoid device 7 includes a solenoid coil 8. rod 9
It is made up of etc.

10 is a small-diameter leak detection flow path provided through the partition plate 2, and 11 is a fluid detection element provided within the leak detection flow path 10. In this embodiment, the gas sensor 11 is used. A leak detection circuit 12 is connected to the gas sensor 11 and includes an oscillator, an amplifier, and the like.

Next, the operation will be explained.

When the solenoid coil 8 of the solenoid device 7 is energized from a drive circuit (not shown), the rod 9 descends from the state shown, and its tip presses the piston rod 6 downward. Therefore, the valve body 4 descends against the spring 5, and the opening 3 is opened. Show me this state.

If gas flows in from the pipe connected to Zumo inlet 1a,
This gas passes through the opening 3 and connects to the outlet 1b through a pipe (
(not shown). When the solenoid coil 8 is de-energized, the valve body 4 and the piston rod 6 rise due to the biasing force of the spring 5, pushing up the rod 9, and the valve body 4 closes the opening 3. At this time, another valve (not shown) connected to the front stage of the inlet 1a, another valve (not shown) connected to the rear stage of the outlet 1b, and another valve (not shown) connected to the rear stage of the outlet 1b. (not shown) are closed, and if gas leaks from these valves, the leaked gas will flow to the case 1 where the valve body 4 is blocking the opening 3. It enters the case 1 from the inlet 1a or the outlet 1b, and further passes through the leak detection channel 10. The gas sensor 11 detects this, and as a result, for example, the output frequency of the oscillator in the leak detection circuit 12 changes,
A detection signal corresponding to this frequency change is output.

Therefore, gas leakage can be detected by displaying information based on this detection signal. Note that when the opening 3 is open, the detection signal is prevented from being output.

FIG. 2 shows a second embodiment of the present invention, and the same parts as in FIG. 1 are denoted by the same reference numerals and their explanation will be omitted.

In this second embodiment, the leak detection channel 10
A leak detection valve device 13 for opening and closing is provided. This leak detection pulp device 13 includes a leak detection channel 1
A rod 15 provided with a valve body 14 that opens and closes the valve body 14.
Solenoid coil 16 for moving the rod 15 up and down
It is made up of etc. In addition, the leak detection circuit 1 in FIG.
2 is not shown, but is provided at an appropriate location.

According to the above configuration, by energizing the solenoid coil 16, the rod 15 can be lowered to close the leak detection flow path 10 with the valve body 14.

FIG. 3 shows an example of use of the fluid control valve device according to the second embodiment.

In FIG. 3, two fluid control valve systems W (hereinafter simply referred to as valves) V+ and Vt are used, and these pulps V, , V are connected in series to each other with a governor 17 disposed between them. Connected via .19. Valve■
A pipe 20 is connected to the inlet 1a of the pulp V2, and a pipe 21 is connected to the outlet 1b of the pulp V2. In addition, pulp V
The leak detection pulp device 13 of No. 1 is shown here as Pulp V, and the leak detection device 13 of Pulp V2 is shown as Valve 2 here.

Next, the operation of the above configuration will be explained with reference to the flowchart of FIG.

First, in steps STI and ST2, valves V, , V
, and close the valves V l + V Z.Next, in step ST3, only the valve V is opened and the presence or absence of leak detection in the leak detection channel 10 is checked. If a leak is detected, the process proceeds to step ST4, where it is determined that a leak has occurred in the valve Vt.Next, in step ST5, with only the valve V2 open, the leak detection channel is Check whether leakage to IO is detected. As a result, if a leak is detected, step S
At T6, it is determined that both valves V,,V, are malfunctioning, and a display is made to that effect.If no leak is detected, at step ST7, it is assumed that only valve V1 is malfunctioning, and a display is made to that effect. Display to that effect. If no leak is detected in step ST3, the process proceeds to step ST8, where the valve Vt is assumed to be normal and used as a normal proportional control valve. When the use is finished in step ST9, the pulps V, , V, are closed in step 5TIO, and the valves vl, v are also closed in step 5TII.

Next, in step 5T12, the presence or absence of leak detection is checked with only the pulp V opened. If a leak is detected, in step 5T13, it is assumed that a leak has occurred in the valve Vt, and a failure of the valve V is displayed. If no leak is detected, in step 5T14, it is displayed that the pulps V, , V, are both normal.

FIG. 5 shows another usage example of the fluid @ control valve device, in which the same parts as in FIG. 3 are given the same reference numerals and redundant explanation will be omitted. This example uses ordinary shutoff valves Vs and Va that do not have the leak detection valve device 13, and the pulp (2).

are used, a governor is arranged between these valves V, , V, and the pulps V a and V o are connected in series via direct piping 18, 19.

Next, the operation of the embodiment according to the configuration shown in FIG. 5 will be explained with reference to the flowchart shown in FIG.

First, in steps STI and ST2, the valves Vt,
(a) Close V6 and close valve V6.0 Next, in step ST3, valves V3 and Vo are opened to check whether or not a leak is detected in the leak detection channel 10 of valve V0. If a leak is detected, the process proceeds to step ST4, where it is determined that a leak has occurred in the valve V4.

If no leak is detected in step ST3, the process proceeds to step ST5, where the valve V4 is assumed to be normal and used as a normal shutoff valve.

After the use is completed in step ST6, the valves V, , V4 . V. Close the valve V in step ST8.
Close 0. Next, in step ST9, valve V4
Check to see if a leak is detected with the VO open.

If a leak is detected, in step 5TIO, it is assumed that a leak has occurred in the valve V3, and a pulp ■ and failure are displayed. If no leak is detected, step 5
Valve V,,V in TII.

Both display normal status.

〔Effect of the invention〕

As described above, according to the present invention, a small-diameter leak detection flow path is provided in addition to the main fluid flow path that is opened and closed by the valve body, and a fluid detection element is provided inside the leak detection flow path. By using a fluid circuit with valves connected in series,
The effect of being able to reliably detect in which valve a leak has occurred can be obtained.

[Brief explanation of drawings]

1 and 2 are cross-sectional side views showing fluid control valve devices according to first and second embodiments of the present invention, FIG. 3 is a cross-sectional side view showing an example of the use of the device, and FIG. FIG. 3 is a flowchart showing the operation of the usage example, FIG. 5 is a sectional side view showing another usage example of the same device, and FIG. 6 is a flowchart showing the operation of the usage example of FIG. ■ is the case, 1a is the inlet, 1b is the outlet, 2 is the partition plate, 3
4 is an opening, 4 is a valve body, 10 is a leak detection channel, and 11 is a fluid detection element. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A case having a fluid inlet and an outlet, a partition plate that partitions the inside of the case approximately at the center, an opening provided in the partition plate and serving as a passage for the fluid, a valve body that opens and closes the opening, and the valve. A fluid control valve device comprising a drive means for opening and closing a body, a small-diameter leak detection channel provided through the partition plate, and a fluid detection element provided in the leak detection channel.