JPH02154878A - Gas cutoff device - Google Patents

Abstract

PURPOSE:To prevent gas from being cut off when a large quantity of gas flows by stopping the judging function on proper usage conditions of gas for a fixed period during the air bleeding of a gas pipeline. CONSTITUTION:A start signal applying means 11, a timer 10 and a judging function stop unit 12 are newly added to the controller 5 of a conventional gas cutoff device. The usage quantity measured by a gas flow measuring means 3 is normally compared with the proper usage conditions preset by a proper usage condition judging unit 8. If the usage quantity is large, gas feeding is stopped by a cutoff means 4. On the other hand, when a gas cutoff device is to be newly installed, the bleeding of the air remaining in a pipeline is judged as an abnormality, and the gas is undesirably cut off. In this case, an external setter 6 is operated, a timer 10 is started by the start signal applying means 11, the judging function stop unit 12 is operated to stop the function of the judging unit 8 for the preset period, thereby the air bleeding of the gas pipeline can be efficiently performed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a gas shutoff device that automatically shuts off a gas passage in the event of an abnormality and prevents gas accidents caused by city gas, propane gas, etc.

2. Description of the Related Art As shown in FIG. 3, a conventional gas cutoff device of this type includes a gas meter 2 in a gas supply line 1, a flow rate measuring means 3 that emits a signal according to the amount of gas passing through the gas meter 2, and A shutoff means 4 is provided to stop the supply of gas, and the usage state is determined based on the flow rate signal from the flow rate measuring means 3. If the proper gas usage conditions set and memorized in advance are deviated from, it is determined that there is an abnormality and the shutoff means 4 is shut off. It was equipped with a control section 5 that issues a closing signal. Further, the control section 5 stores a plurality of proper gas usage conditions, and can select one proper gas usage condition using an external setting device 6 according to the actual gas usage of the gas consumer.

An example of the configuration of this conventional control section is shown in FIG. Components with the same reference numerals as in FIG. 2 are components having the same functions. The control unit 5 includes a usage state detection unit 7 that inputs the flow rate signal from the aforementioned flow rate measuring means 3 and detects the usage state of the gas, and a usage state detection unit 7 that detects the gas usage state by inputting the flow rate signal from the aforementioned flow rate measuring means 3, and a usage state detection unit 7 that detects the gas usage state selected from a plurality of stored gas proper usage conditions. An appropriate usage condition determination unit 8 that determines that there is an abnormality when the conditions are exceeded and outputs a cutoff signal; and an external setting device 6 that externally selects and sets one of a plurality of gas appropriate usage conditions.
and an external signal control section 9 that performs communication control with the external signal control section 9.

When a gas cutoff device configured as described above is newly installed at a gas consumer, if air remains in the gas piping inside the house, this air is once released to the outside and the gas piping is connected to the gas line. It had to be kept full and the gas ready for use.

Problems to be Solved by the Invention However, with the configuration described above, when a gas cutoff device is newly installed at a gas consumer and the gas appliance or gas pipe is opened to remove air from the gas pipe inside the house, a large amount of There is a problem in that the gas flows, and the proper usage condition determining unit 9 determines that there is an abnormality and outputs a shut-off signal, and the shut-off means 4 stops the gas supply and interrupts the air venting of the gas pipe.

The present invention solves this conventional problem, and aims to stop the function of determining the proper usage conditions of gas for a certain period of time when air is removed from gas pipes, and to effectively remove air from gas pipes. do.

Means for Solving the Problems In order to solve the above problems, the gas cutoff device of the present invention includes a flow rate measuring means for generating a signal in response to the passing gas in a gas passage, and a flow rate signal sent from the flow rate measuring means. a usage state detection section that detects the usage state of the gas; a proper usage condition determination section that determines that it is abnormal if the signal from the usage state detection section deviates from the gas proper usage conditions and outputs a cutoff signal; and a proper usage condition determination section that counts a predetermined time. a timer, a start signal applying means for starting the timer, a determination function stop section that stops the function of the timer while the timer is operating for the appropriate usage condition determination section;
A configuration comprising: a control section including an external signal control section that performs communication control between the start signal application means and the external setting device; and a cutoff means that cuts off the gas passage in response to a cutoff signal from the control section. It is.

Operation According to the above-described configuration, when the present invention sends a function stop signal to the appropriate usage condition determining section from the outside using an external setting device, the timer is activated and starts counting a certain period of time. While the timer is operating, the determination function stop section stops the function of the appropriate usage condition determination section so that the gas will not be shut off even if a large amount of gas flows through the gas passage.

Example Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, the same reference numerals as in FIGS. 3 and 4 indicate components having the same functions. The control unit 5 includes a usage state detection unit 7 which inputs a flow rate signal from a conventional flow measurement means 3 and detects the usage state of the gas flowing in the gas supply line 1, and a usage state detection unit 7 that detects the usage state of the gas flowing in the gas supply line 1. External setting device 6
a suitable usage condition determination section 8 that determines that an abnormality occurs when the proper gas usage conditions selected from a plurality of stored proper usage conditions are outputted and outputs a cutoff signal; and a timer 10 that counts a predetermined time; A starting signal applying means 11 for starting the timer 10, a determination function stopping section 12 for stopping the function of the timer 10 while the timer 10 is in operation with respect to the appropriate usage condition determining section 8, the starting signal applying means 11 and an external setting device. external signal control unit 9 that controls communication with 6;
It is composed of C.

The operation of the gas cutoff device configured as above will be explained. First, the external setting device 6 communicates with the external signal control unit 9 to select and set one appropriate gas usage condition from among a plurality of pre-stored gas usage conditions according to the actual gas usage status of the gas consumer. do. When the usage state detection unit 7 receives a signal generated by the flow rate measuring means 3 in accordance with the gas flow rate passing through the gas meter 2 through the gas supply line 1 as a flow rate signal, the appropriate usage condition determination unit 8 determines whether the selected gas Compare and judge with proper usage conditions. Here, it is determined that there is an abnormality in the gas supply system, such as when a large flow rate is flowing, a cutoff signal is output, and the gas supply is closed by the cutoff means 4. On the other hand, when installing a new gas cutoff device, there may be some air remaining in the indoor gas piping, and it is necessary to open the indoor gas supply system and extract the air inside the piping to the outside. In such a case, the appropriate usage condition determining unit 8 may determine that a large flow of gas is released and the gas supply may be stopped by the shutoff means 4.In order to avoid such problems,
The external setting device 6 is operated to send data including information for temporarily stopping the appropriate usage condition determination function to the external signal control section 9.

FIG. 2 is a diagram showing a communication method between the external setting device 6 and the external signal control section 9. As shown in FIG. The external setting device 6 turns on the coil.
By turning off, data is transmitted and the external signal control unit 9
Then, the coil on/off signal is converted to a reed switch contact signal and the data is received. The external signal control unit 9 checks whether the data received by the receiver is erroneous or not, and the receiver sends back the data by blinking the LED.

The external setting device 6 compares the data sent back via the phototransistor with the sent data to confirm that there are no errors.

By performing the above communication, the external signal control section 9 activates the activation signal applying means 11 to activate the timer 10.

The timer 10 counts for a certain period of time. During this time, the determination function stop section 12 stops the determination function of the appropriate usage condition determination section 8. While the determination function is stopped, even if the gas supply system is opened and a large amount of gas flows, the gas passage will not be blocked, making it possible to efficiently remove air from the gas piping.

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

(1) When venting air from gas piping (air purge), the function of the proper usage condition determining section of the gas cutoff device can be temporarily stopped, so air can be efficiently vented from gas piping.

(2) Since the function of the proper usage condition determining section of the gas cutoff device can be stopped using a complicated communication pattern using an external setting device, there is a very low possibility that the function will stop due to an external error or the like.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a gas cutoff device according to an embodiment of the present invention, Fig. 2 is a diagram showing a communication method between an external setting device and an external signal control unit of the device, and Fig. 3 is a diagram showing a conventional gas cutoff device. Block diagram of gas cutoff device, FIG. 4 is a block diagram of a conventional gas cutoff device. DESCRIPTION OF SYMBOLS 1...Gas supply line, 2...Gas meter, 3...Flow rate measuring means, 4...Shutoff means, 5...Control unit, 6 -... External setting device, 7... Usage condition detection section, 8... Appropriate usage condition determination section, 9... External signal control section, 10...
... Timer 11 ... Start signal application means, 12 ... Judgment function stop section. Agent's name: Ben, Buried soil p No.t, i and 1 other person Figure 1 $2 Figure

Claims (1)

[Claims] a flow rate measuring means that emits a signal according to the amount of gas passing through the gas passage; a usage state detection section that detects the usage state of the gas based on the flow rate signal sent from the flow rate measurement means; and a usage state detection section that detects whether the signal from the usage state detection section is gas appropriate. an appropriate usage condition determination unit that determines that deviation from the usage conditions is abnormal and outputs a cutoff signal; a timer that counts a predetermined time; a start signal application unit that starts the timer; a determination function stop section that stops the function while the is in operation;
a control section comprising an external signal control section that performs communication control with an external setting device that starts stopping the determination function of appropriate usage conditions from the outside; and a cutoff means that cuts off the gas passage in response to a cutoff signal from the control section. Gas cutoff device equipped with.