JPH0342524A - Gas shut off device - Google Patents

Abstract

PURPOSE:To cope with all gas meter numbers without extending a memory part by setting meter information with communication by means such as a flow rate sensor, a gas flow rate arithmetic part, and the memory part. CONSTITUTION:A flow rate sensor 3, a gas flow rate arithmetic part 4, a memory part 15, etc., are provided. Information indicating the number of pulses of the signal outputted from the sensor 3 in one rotation, the shut-off alarm level range, or the like is received to calculate a total sum maximum flow rate discrimination value, an individual maximum flow rate discrimination value, a safe continuation table discrimination value, etc., which are preliminarily calculated in the memory part in a conventional manner, by a shut-off discrimination value arithmetic part 14, and results are stored in the memory part 15. Thus, meter information is set by communication to cope with all gas meter numbers without extending the memory part.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a gas shutoff device that monitors the flow rate of gas and shuts off the gas passage in case of an abnormality.

2. Description of the Related Art A conventional example will be described with reference to FIG. In Fig. 2, there is a gas cutoff device, 2 is a gas meter, 3 is a flow rate sensor that detects the flow rate in the gas passage, 4 is a gas flow rate calculation unit that calculates the gas flow rate from the signal of the flow rate sensor 3, and 5 is a cutoff/block for each meter. A memory section for each meter stores the judgment value of the alarm level, 6 a memory selection information means for receiving the judgment value of which meter in the memory section, and 7 a memory section for each meter based on the memory selection information means 6. 5 is a memory selection unit that selects a judgment value from 5; 8 is a cutoff judgment unit that compares the calculated value of the gas flow rate calculation unit with the judgment value selected by the memory selection unit 7 and makes a cutoff judgment; A valve drive unit receives a signal and drives a cutoff valve. IO is a cutoff valve that receives a signal from the valve drive unit 9 and cuts off a gas passage. 11 is a communication means.

The memory unit 5 stores, for each meter, a total maximum flow rate determination value that is the determination value of the overall flow rate, an individual maximum flow rate determination value that is the maximum determination value of each individual appliance, and a flow rate classification and cutoff time for each individual appliance. Judgment values such as a safety continuity table are stored in memory. However, this judgment value changes depending on the gas type and meter number, so in order to correspond to gas types and meter numbers nationwide, it is necessary to make the memory section huge or to install a gas cutoff device with a memory section corresponding to each. becomes necessary.

Problems to be Solved by the Invention As mentioned above, if the memory section is to be compatible with any gas type and meter number, the cost of the memory section will increase enormously. In addition to being limited, there were cases where selection errors were made to match the contents of the memory section.

Means for Solving the Problem In order to solve this problem, the gas cutoff device of the present invention has the following features:
a flow rate sensor that detects the flow rate of the gas passage; a gas flow rate calculation unit that calculates the gas flow rate from a signal from the flow rate sensor; a meter information reception unit that receives meter information from an external communication means; and a meter information reception unit that receives meter information from the meter information unit. A cutoff judgment value calculation section calculates a cutoff judgment value of the meter based on the meter information; a memory section stores the cutoff judgment value calculation result; and a cutoff judgment value calculation section that compares the values of the gas flow rate calculation section and the memory section and shuts off the meter. The fuel cell includes a shutoff determining section that makes a determination, a valve driving section that receives a signal from the shutoff determining section and drives a shutoff valve in the gas passage, and the shutoff valve.

Function: By setting the meter information through communication using this means, the gas cutoff device can be made compatible with all gas types and meter numbers without adding a memory section.

EXAMPLE An example of the present invention will be described below with reference to FIG. In Figure 1, the same numbers as in Figure 2 represent the same items, 13
14 is a meter information receiving section that receives meter information from an external communication means, 14 is a cutoff judgment value calculation section that calculates a meter cutoff judgment value based on the meter information from the meter information section 13, and 15 is a cutoff judgment value. A memory section 12 that stores calculation results is a cutoff determination section that compares the calculation results of the gas flow rate calculation section with the values in the memory section and makes a cutoff determination. The meter information receiving section receives information such as the calorie of the flowing gas, the unit measurement volume which is the meter number, how many pulses the flow sensor 3 outputs in one revolution, and the shutoff alarm level range. In the conventional example, the total maximum flow rate determination value, the individual maximum flow rate determination value, the safety continuity table determination value, etc., which are previously stored in the memory unit 5, are calculated by the shutoff determination value calculation unit 14, and the results are stored in the memory unit 15. . By setting the meter information through communication, it is possible to support all gas types and meter numbers without adding a memory section.

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

(1) By setting meter information through communication, it is possible to support all gas types and meter numbers without adding a memory unit. Moreover, it can be realized at low cost.

(2) Since the meter status is written directly instead of being selected in accordance with the internal memory, errors in setting the cutoff judgment value are reduced, and changes in the judgment value for changes in calories and size can be set using communication means. This can be easily done by

(3) In addition, in the past, there were many errors in meter selection, which meant that the meter had to be replaced and customers were often unable to use gas. There will be no more unusable things.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a gas cutoff device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional example. 3...Flow rate sensor, 4...Gas flow rate calculation unit, 9...Valve drive unit, lO...Shutoff valve, 12... Shutoff determination unit, 13... Meter information receiving unit, 14... Shutdown judgment value calculation unit,
15... Memory section.

Claims (1)

[Claims] a flow rate sensor that detects the flow rate of the gas passage; a gas flow rate calculation unit that calculates the gas flow rate from a signal from the flow rate sensor; a meter information reception unit that receives meter information from an external communication means; and a meter information reception unit that receives meter information from the meter information unit. A cutoff judgment value calculation section calculates a cutoff judgment value of the meter based on the meter information; a memory section stores the cutoff judgment value calculation result; and a cutoff judgment value calculation section that compares the values of the gas flow rate calculation section and the memory section and shuts off the meter. A gas cutoff device comprising: a cutoff determination section that makes a determination; a valve drive section that receives a signal from the cutoff determination section and drives a cutoff valve in a gas passage; and the cutoff valve.