JPH04326035A - Gas pipe leak detection device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas leak detection device for ensuring safety in gas use when a gas pipe leaks after a gas meter.

0002

[Prior Art] Conventionally, this type of gas pipe leak detection device
As shown in FIG. 3, a flow rate measuring means 11 outputs a flow rate signal g according to the amount of passing gas, and upon receiving the flow rate signal g sent from the flow rate measuring means 11, detects the gas usage state and outputs a pulse signal p. a gas usage timer 13 that counts up a timer starting from reception of the first pulse signal p of the usage status detection unit 12 and outputs an alarm signal a when it reaches a predetermined value (30 days); Detection part 1
If the flow rate pulse signal p from 2 is not received for a predetermined time (60 minutes), that is, if the gas is not used for 60 minutes, a reset signal r1 is output from the no-pulse detector 14 and the usage state detector 12, which reset the gas usage timer 13. a usage state calculation unit 15 that calculates the flow rate in the usage state when the interval between the flow rate pulse signals p is stable for a predetermined number of consecutive times;
A registration permission means 16 outputs a registration permission signal s for permitting storage of the flow rate of the calculation result of the usage state calculation unit 15, and stores the flow rate of the calculation result of the usage status calculation unit 15 while the registration permission signal s is applied. After being stored in the usage status storage unit 17, the flow rate calculated by the usage status calculation unit 15 is compared with the flow rate registered in the usage status storage unit 17, and it is determined that the flow rate is the same. If the reset signal r2
The gas usage timer 13 is composed of a proper usage state determining section 18 that outputs the gas usage timer 13 and resets the gas usage timer 13, and a notification means 19 that receives the alarm signal a of the gas usage timer 13 and issues a warning.

[0003] Now, if the gas pipe leaks and the interval between pulse signals p (period in which no gas is used) continues to be less than 60 minutes, the timer counts up for 30 days and outputs an alarm signal a to notify the user. Means 19 warns of gas pipe leakage. When the gas pipe is normal, the flow rate pulse interval is at least 60 minutes or more during the 30 days, and the no-pulse detection unit 14
The reset signal r1 is output from the gas usage timer 1.
The timer 3 is set to be reset.

[0004] Furthermore, if the pilot flame of the gas appliance has been on for 30 days or more, the pilot flame flow rate is stored in the usage state storage section 17 by inputting the registration permission signal s. When a flow rate that is considered to be the same as this stored flow rate flows, a reset signal r2 is output from the proper usage state storage unit 18,
The timer of the gas usage timer 13 is reset.

[0005]

[Problem to be Solved by the Invention] However, in such a gas pipe leak detection device, the registration permission signal s is applied in order to register the flow rate that is regarded as the pilot flame flow rate. Sometimes, if the pilot fire happened to be used in multiple devices, the total flow rate was registered. and,
In order to reduce the flow rate when multiple pilot lights are used at the same time, if the pilot light of one appliance is used for 30 days, a gas pipe leakage occurs if the gas flow rate is lower than the memorized minimum gas flow rate. A false alarm was issued.

[0006] In other words, in the conventional device, there was a problem in that the setting conditions for the alarm output were found to be inadequate, resulting in false alarms being issued.

Therefore, in the gas pipe leakage detection device of the present invention, it is an object of the present invention to improve the reliability of the device by improving the method of registering the pilot flame flow rate.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the means of the present invention includes a flow rate measuring means that outputs a flow rate signal corresponding to the amount of passing gas, and a stop interval of the flow rate signal and a first a usage state detection section that compares the magnitude with a predetermined time and outputs a reset signal and a timer signal, respectively, and outputs a count signal when the pause period is longer than a second predetermined time; a first timer section that outputs an alarm signal A when a predetermined time elapses after starting counting of the first timer, and resets the count of the first timer upon receiving the reset signal; a usage state calculating section that calculates the flow rate in the usage state when received as a stable flow rate at the timer, a second timer section that counts a predetermined period of time, a start signal applying means that starts the second timer, and the second timer. a plurality of usage status storage unit that stores a plurality of flow rates of the calculation results of the usage status calculation unit during operation, and a comparison between the flow rate of the calculation results of the usage status calculation unit and the flow rate of the usage status storage unit, and the flow rate of the usage status calculation unit is the same. If it is deemed that there is a gas leak, the gas passage comprises a proper usage state determination section that outputs a reset signal to reset the count of the first timer, and a notification means that receives the alarm signal A and issues a gas leak warning. It is equipped with a shutoff means for shutting off the

[0009]

[Operation] According to the above means, the present invention stores a plurality of flow rates calculated by the usage status calculation unit in the usage status storage unit while the second timer unit is activated by the activation signal application unit. After the operation of the second timer section has stopped, the calculation result of the usage state calculation part is compared with the flow rate stored in the multiple usage state storage part (i.e., the flow rate of the calculation result while the timer is operating), and if the flow rate is the same. If it is determined that there is, a reset signal is output and the count of the first timer is reset. Then, the warning signal is no longer output depending on the pilot flame flow rate stored during the timer operation.

By storing a plurality of pilot lights while the timer is operating in this manner, false alarms caused by pilot lights are reduced and the reliability of leakage detection is improved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the gas pipe leak detection device of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention, which includes a flow rate measuring means 1 that outputs a flow rate signal G corresponding to the amount of gas passing through, and a flow rate signal G of the flow rate measuring means 1 that receives the flow rate signal G and determines its rest period and preset period. 1 predetermined time (now, 6
The usage state detecting unit 2 compares the magnitude with 0 minutes). When the pause period is less than 60 minutes, a timer signal T is output, and when it is longer than 60 minutes, a reset signal R1 is output.
Output. Further, the usage state detection unit 2 compares the pause period with a second predetermined time (currently 2 minutes), and outputs a count signal C if the pause period is longer than 2 minutes.

[0012] The first timer section 3 starts counting the timer upon receiving the timer signal T from the usage state detection section 2, and outputs an alarm signal A when a preset predetermined period (currently 30 days) has elapsed. The usage state detection unit 2 is output within this predetermined period.
When receiving a reset signal R1 of 1 or a reset signal R2 of a proper usage state determining section 8, which will be described later, the timer stops counting. When the usage state calculation unit 4 receives the count signal C from the usage state detection unit 2 stably (for example, the flow rate fluctuation rate is 2% or less) and continuously a predetermined number of times (here, it is assumed to be two times), The flow rate at this time is calculated and flow rate calculation data Q is output. The second timer unit 5 is activated for a predetermined period (currently 30
count up the timer.

When the second timer section 5 is operating, it receives a flow rate calculation instruction, and the usage status calculation unit 4 outputs the flow rate calculation data Q to the multiple usage status storage unit 7. The multiple use state storage section 7 stores a plurality of pieces of this flow rate calculation data, and when the second timer section 5 is not operating, the stored flow rate calculation data MQ1 to MQN are stored in the appropriate use state determination section 8. Output to. When the second timer section 5 is not operating, it receives a flow rate comparison instruction, and the usage condition calculation section 4 outputs the flow rate calculation data Q to the appropriate usage condition determination section 8. The proper usage state determination section 8 compares the flow rate calculation data Q of the usage state calculation section 4 with the flow rate calculation data MQ1 to MQN of the multiple usage state storage section 7 (currently, the difference in flow rate is within 5%).
If so, it is assumed that the flow rates are the same and a reset signal R2 is output.

When the notification means or cutoff means 9 receives the alarm signal A from the first timer section 3, it determines that there is a gas leak in the gas pipe (not shown) after the gas meter (downstream side), and stops using the gas. As an instruction to ensure safety, a warning is issued or an instruction is given to shut off the gas passage (not shown).

The above-mentioned means can be easily realized by using arithmetic and judgment functions based on program operations of a microcomputer or the like.

FIG. 2 shows a program flow of the above means. It is now assumed that the flow from the start of processing to the end of processing is processed periodically by an interval timer or the like. In process 21 (the number on the upper left of each block), the usage state detection section 2 detects the usage state, and outputs a count signal C, a reset signal R1, and a timer signal T. For each signal, the process moves to process 22 in the case of the count signal C, to process 27 (described later) in the case of the reset signal R1, and to process 28 (described later) in the case of the timer signal T. In process 22, the usage state calculation unit 4 calculates the usage status as flow rate calculation data Q, and in process 23, it is determined whether or not the timer of the second timer unit 5 is operating, and if it is in operation, the process moves to process 24. . If it is not in operation, the process moves to process 25.

In step 24, the plurality of usage state storage section 7 stores a plurality of flow rate calculation data Q of the usage state calculation section 4 as MQ1 to MQN, and the processing ends. In process 25, the proper usage state determination section 8 compares the flow rate calculation data of the usage state calculation section 4 with MQ1 to MQN of the multiple usage state storage section 7, and if the flow rates are considered to be the same (within 5%), a reset signal R2 is sent.
is output, and the process proceeds to process 26. In process 26, the first timer section 3 receives the reset signal R2, clears the first timer, and ends the process. If the flow rates are not the same, the process ends.

Further, in process 27, the second timer section 3 receives the reset signal R1, clears the first timer, and ends the process. Further, in process 28, the second timer section 3 receives the count signal T and counts up the first timer, and in process 29, it is determined whether or not the first timer has reached 30 days. If so, the process ends. When 30 days or more have passed, an alarm signal A is output and the process moves to process 30. In step 30, the notification means or cutoff means 9 receives the alarm signal A and issues a warning or cuts off the gas passage.

[0019]

As is clear from the above description, the gas pipe leakage device of the present invention eliminates false alarms when a pilot light is used in a gas appliance, and can be expected to improve the reliability of the device.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram showing an embodiment of the gas pipe leak detection device of the present invention.

[Fig. 2] Program flow diagram in one embodiment of the present invention

[Figure 3] Functional block diagram of a conventional gas pipe leak detection device

[Explanation of symbols]

1 Flow rate measurement means 2 Usage status detection section 3 First timer section 4 Usage status calculation section 5 Second timer section 6 Start signal application means 7 Multiple usage status storage unit 8 Proper usage condition determination section 9. Notification means or blocking means

Claims (1)

[Claims] 1. A flow rate measuring means for outputting a flow rate signal corresponding to an amount of gas passing through the flow rate measuring means; and a flow rate measuring means for comparing a stop interval of the flow rate signal with a first predetermined time and outputting a reset signal and a timer signal respectively; a usage state detection unit that outputs a count signal when the pause interval is longer than a second predetermined time; and a usage state detection unit that receives the timer signal, starts counting a first timer, and outputs an alarm signal A when a predetermined time elapses. a first timer unit that resets the count of the first timer upon receiving the reset signal; and a usage state calculation unit that calculates the flow rate in the usage state when the timer signal is received as a stable flow rate a predetermined number of times in succession; A second timer unit that counts a predetermined period of time, a start signal applying means that starts the second timer, and a plurality of use cases that store a plurality of flow rates as calculation results of the usage state calculation unit while the second timer is operating. When the flow rate calculated by the state storage unit and the usage state calculation unit is compared with the flow rate in the usage state storage unit and it is determined that the flow rates are the same,
Notifying means for receiving the alarm signal A and notifying a gas leak warning, comprising a proper usage state determination unit that outputs a reset signal that resets the count of the first timer;
Or a gas pipe leak detection device equipped with a shutoff means to shut off the gas passage.