JP4017803B2 - Gas security device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas security device that measures a gas flow rate and shuts a gas passage when an abnormal flow rate is measured, thereby ensuring safety in using the gas.
[0002]
[Prior art]
In recent years, if a gas meter that measures the amount of gas used has been measured for a large amount of flow or has been used for a long time that is not normal, it is judged abnormal and the gas passage is shut off to ensure safety. One with a built-in gas security device is widespread.
[0003]
In this type of gas safety device flow rate measurement method, a membrane meter that measures the flow rate from the volume that has passed through the meter within a predetermined time is generally used.
[0004]
In this membrane type meter, when a gas air conditioner such as a gas heat pump (GHP) type is installed on the downstream side, the reaction is slow with respect to the pulsation of the gas pressure generated after the start of the GHP operation, and the flow rate fluctuation is absorbed. Smoothed.
[0005]
[Problems to be solved by the invention]
However, when the membrane meter is used, there is a problem that it cannot be realized even if an individual charge system is performed by measuring the time during which the gas pressure pulsates and distinguishing the gas equipment used. .
[0006]
In view of the above-described conventional problems, an object of the present invention is to provide a gas security device capable of detecting a state in which gas pressure is pulsating using an ultrasonic sensor for flow rate measurement.
[0007]
[Means for Solving the Problems]
The gas safety device of the present invention includes a gas flow path in which a gas flows and a blocking means is disposed, an ultrasonic sensor that is disposed at a position opposite to the gas flow path and includes an ultrasonic wave transmitting section and a receiving section , an ultrasonic sensor driving circuit for driving the ultrasonic sensor, and a control circuit for controlling the ultrasonic sensor drive circuit and interrupting means, said control circuit from transmission to reception when ultrasound travels from the downstream to the upstream direction Means for recognizing that a gas pulsation has occurred when the result of subtracting the time difference t2 from transmission to reception when the ultrasonic wave travels from upstream to downstream from the time difference t1 includes a negative value ; A time measuring means for measuring the recognized time, wherein the time measuring means distinguishes and measures the usage time of the specific gas equipment, and the gas fluctuation pressure is measured when a gas equipment such as GHP is used. Occurred Can, at a flow rate change by detecting the gas flow rate in the ultrasonic sensor can detect the state in which the gas pressure is pulsating, it is possible to measure the operating time.
[0009]
Further, the gas flow path in which the gas flows and the blocking means is disposed, the ultrasonic sensor which is disposed at the opposite position of the gas flow path and includes the ultrasonic wave transmitting section and the receiving section, and the ultrasonic sensor is driven. An ultrasonic sensor drive circuit, and a control circuit for controlling the ultrasonic sensor drive circuit and the blocking means, the control circuit from the upstream from the time difference t1 from transmission to reception when the ultrasonic wave travels from downstream to upstream. Means for recognizing that a pulsation of gas occurs when the result of subtracting the time difference t2 from transmission to reception when the ultrasonic wave travels in the downstream direction includes a negative value and a positive value; Time measurement means for measuring the time during which the negative value and the positive value are alternately output, and how many cycles are output with one output of the negative value and the positive value as one cycle. It has a pulsation storage means for storing, and the time measurement The stage and the pulsation storage means, together with measures to distinguish the use time of the specific gas appliance, which was set to detect the occurrence information of the gas pulsations, it is possible to measure the operating time of the gas appliance producing gas pressure fluctuation Gas pulsation information can be detected.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a gas security device of the present invention will be described with reference to FIGS. 1 and 2.
[0011]
In FIG. 1, reference numeral 1 denotes an ultrasonic sensor, which is composed of an ultrasonic wave transmitting section and a receiving section, each disposed at a position opposite to the gas flow path 2, and measures the time from transmission to reception. The gas channel 2 is provided with blocking means (not shown) for blocking the channel. 3 is an ultrasonic sensor driving circuit for driving the ultrasonic sensor 1, and 4 is a control circuit for controlling all operations such as the ultrasonic sensor driving circuit 3 and the blocking means. Reference numeral 5 denotes a time measuring means provided in the control circuit 4 for measuring the time of an event under a certain condition.
[0012]
The operation in the above configuration will be described with reference to FIGS. The ultrasonic wave transmitted from the transmitter of the ultrasonic sensor 1 is received by the receiver located at the counter electrode. At this time, a time difference t is generated between the time of sending and receiving the ultrasonic wave. Further, since the ultrasonic wave passes through the gas flowing through the gas flow path 2 from the time of sending to the time of receiving, the time difference t is small when the ultrasonic wave advances from the upstream to the downstream direction, and the time difference t is super high from the downstream to the upstream direction. When the sound wave advances, the time difference t increases. When the former is t2 and the latter is t1, when (t1-t2) is calculated by the control circuit 4, the result is always a value of (+). If gas is flowing in the opposite direction, the result is (-). In other words, if the calculation result of (t1−t2) is in a state where it is alternately output to (+) and (−), the direction of the gas flowing through the gas flow path 2 is constantly changing, It can be recognized that gas pulsation is occurring.
[0013]
And when it recognizes that the gas is pulsating, the time of pulsation is measured and memorize | stored by the time measurement means 5, and it can distinguish and recognize the use time of specific gas apparatuses, such as GHP.
[0014]
Moreover, it can also be made to alert | report that it is pulsating outside by an alerting | reporting part (not shown). The notification unit may be a display by a display device, an acoustic unit, or a communication unit.
[0015]
Next, another embodiment of the gas security device of the present invention will be described with reference to FIG. In addition, about the component same as the said embodiment, the same referential mark is attached | subjected and description is abbreviate | omitted and only a different point is demonstrated.
[0016]
In the present embodiment, a pulsation storage unit 6 is provided in the control circuit 4 in place of the time measurement unit 5. This pulsation storage means 6 is used when (+) and (−) are alternately output as the calculation result of (t1−t2) output by the control circuit 4 (+) and (−) once. The number of output cycles is stored with the output as one cycle. Also, the number of times this state has occurred, for example, per day is stored.
[0017]
Thereby, the information of the gas pulsation by the apparatus installed in the downstream of the gas security device can be detected.
[0018]
Further, by providing both the time measuring means 5 and the pulsation storage means 6 of each of the above embodiments, the above-mentioned effects can be achieved.
[0019]
【The invention's effect】
According to the gas safety device of the present invention, the following effects can be obtained as is apparent from the above description.
[0020]
By providing a time measurement means that detects fluctuations in gas pressure with an ultrasonic sensor and measures the pulsating time, it is possible to recognize the usage state of a specific gas device and measure its usage time. The fee system can be realized, and the spread of gas equipment can be promoted.
[0021]
Also, using the measurement data from the ultrasonic sensor, the time difference t2 from transmission to reception when the ultrasonic wave advances from the downstream to the upstream direction to the time difference t2 from transmission to reception when the ultrasonic wave advances from the upstream to the downstream direction. If the result of subtracting contains a negative value and a positive value, it is recognized that gas pulsation has occurred, and the negative value and the positive value when the negative value and the positive value are output alternately By providing a pulsation storage means for storing how many times the output of one value of one value is output as one period, it is possible to store the period and number of pulsations, so that it is possible to obtain information on gas pulsations Become.
[0022]
Further, by providing both the time measuring means and the pulsation storage means, it is possible to measure the usage time of the gas equipment that generates the gas fluctuation pressure and to detect the information of the gas pulsation.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an embodiment of a gas security device of the present invention.
FIG. 2 is an operation flowchart of the embodiment.
FIG. 3 is a block diagram showing the configuration of another embodiment of the gas security device of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ultrasonic sensor 2 Gas flow path 3 Ultrasonic sensor drive circuit 4 Control circuit 5 Time measurement means 6 Pulsation memory means

Claims (2)

Gas flow path in which gas flows and a blocking means is disposed, an ultrasonic sensor that is disposed at a position opposite to the gas flow path and includes an ultrasonic transmission unit and a reception unit, and an ultrasonic wave that drives the ultrasonic sensor A sensor drive circuit, and a control circuit for controlling the ultrasonic sensor drive circuit and the blocking means,
The control circuit has a negative value obtained by subtracting the time difference t2 from transmission to reception when the ultrasonic wave travels from upstream to downstream when the ultrasonic wave travels from the downstream to upstream direction. Including a means for recognizing that gas pulsation has occurred, and a time measuring means for measuring the time for recognizing the pulsation,
A gas security device that distinguishes and measures the usage time of a specific gas device by the time measuring means. Gas flow path in which gas flows and a blocking means is disposed, an ultrasonic sensor that is disposed at a position opposite to the gas flow path and includes an ultrasonic transmission unit and a reception unit, and an ultrasonic wave that drives the ultrasonic sensor A sensor drive circuit, and a control circuit for controlling the ultrasonic sensor drive circuit and the blocking means,
The control circuit has a negative value obtained by subtracting the time difference t2 from transmission to reception when the ultrasonic wave travels from upstream to downstream when the ultrasonic wave travels from the downstream to upstream direction. And a means for recognizing that a gas pulsation has occurred, a time measuring means for measuring the time during which the pulsation is recognized, and the negative value and the positive value are output alternately. Pulsation storage means for storing how many cycles were output with one output of the negative value and the positive value as one cycle,
A gas safety device that uses the time measuring means and the pulsation storage means to distinguish and measure the usage time of the specific gas equipment and to detect the occurrence information of the gas pulsation.

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