JPH0311550Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a leakage detection device for detecting gas leakage from gas pipes of gas ovens, gas boilers, and other combustion devices.

(Conventional technology and its problems) Conventional devices for detecting leakage beyond valves in gas piping are:
As shown in FIG. 1, an upstream shutoff valve and a downstream shutoff valve are installed in the piping, and a suction pump is used to create a vacuum between the shutoff valves to detect gas leakage beyond the valves. Although this device is functionally superior, it requires a suction pump to create a vacuum between the two valves installed in the piping, and equipment to release the gas emitted when creating a vacuum. Because of this, the configuration and control became complicated and expensive, and in practice it was only installed in large-sized combustion equipment. The present invention provides a small and low-cost detection device with a unique configuration.
The following is an explanation using the figures below.

(Means for solving the problem) Reference numeral 1 indicates a first solenoid valve, and reference numeral 2 indicates a second solenoid valve. A common chamber 3 in which the downstream side of the first electromagnetic valve 1 and the upstream side of the second electromagnetic valve 2 are commonly formed is formed in the gas pipe 4. Reference numeral 5 denotes a leak detection section, and this leak detection section 5 is configured into a detection chamber 8 and a pressure chamber 9 by a diaphragm 7 operated by an actuating means 6, and the common chamber 3 has a detection chamber 8 and a detection chamber 9. The pressure chamber 9 communicates with the upstream side of the first solenoid valve 1 through a pressure tube 12, and the detection chamber 8 is provided with a pressure detection means 10 such as a pressure sensor.
The configuration is such that the The actuation means 6 of the leak detection section 5 may be electromagnetic or electric means such as a solenoid.

(Function) In the above configuration, for example, during a temporary stop for temperature adjustment of combustion devices, the first solenoid valve 1 and the second solenoid valve 2 are closed in this order. Due to this closure, the pressure in the detection chamber 8 is reduced to approximately atmospheric pressure. Further, the diaphragm 7 is lowered by the actuating means 6, and the pressure inside the detection chamber 8 is lowered to, for example, -200 mmAq. This can be done by lowering the diaphragm 7 by 1 cc if the total internal volume of the detection chamber 8 and the common chamber 3 is about 50 cc. In such a state, if there is a leak in the first solenoid valve 1, the second solenoid valve 2, or both, the pressure in the detection chamber 8 increases via the common chamber 3 and the detection tube 11. . The pressure detecting means 10 detects this pressure rise and learns that there is a leak in the electromagnetic valves 1, 2, etc., and stops supplying gas to the combustion device until they are repaired or replaced. That is, since the pressure inside the detection chamber 8 is below atmospheric pressure, even if there is a leak, there will be no flow of gas to the combustion device until at least the pressure in the detection chamber 8 reaches atmospheric pressure or higher. Immediately after detecting the pressure rise by the detection means 10, the operation of the combustion device is stopped,
At the same time, turn on the alarm output. This also prevents gas from flowing into the combustion device that is temporarily stopped for temperature adjustment. In this case, since the pressure impulse chamber 9 is provided and the pressure escape is configured on the upstream side of the first electromagnetic valve 1 via the pressure impulse pipe 12, there is no abnormal pressure or drop in the pressure impulse chamber 9.
It is possible to accurately grasp the pressure change in the detection chamber 8.

(Effects of the invention) Since the invention is as described above, it does not require complicated configuration and control, and can be extremely miniaturized, so it can be provided at a low price and can be used in large-scale combustion equipment. Of course, it has the advantage of being able to install even small-scale equipment.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a conventional device, and FIG. 2 is a schematic diagram of the device of the present invention. Reference numeral 1...First solenoid valve, 2...Second solenoid valve, 3...Common chamber, 4...Gas piping, 5...Leakage detection section, 6...Operating means, 7...Diaphragm,
8... detection chamber, 9... pressure impulse chamber, 10... pressure detection means, 11... detection tube, 12... pressure impulse tube.

Claims (1)

[Scope of utility model registration request] In the gas piping, a common chamber is formed in which the downstream side of the first solenoid valve and the upstream side of the second solenoid valve are commonly configured, and a detection chamber and a pressure chamber are separated by a diaphragm operated by an actuating means. a leakage detection section is provided, the detection chamber and the common chamber are communicated with each other through a detection tube, the upstream side of the first electromagnetic valve and the pressure impulse chamber are communicated with each other through a pressure impulse tube, and the detection chamber is connected to the detection chamber. is a leak detection device equipped with pressure detection means.