JPS6082817A - Flow-rate measuring apparatus - Google Patents

Abstract

PURPOSE:To obtain a constant zero judging flow rate regardless of the size number of a meter, by changing the zero judging time in correspondence with the size number of the gas meter. CONSTITUTION:A flow rate sensor 2 transmits flow rate pulses corresponding to the measurement of a gas meter. A size-number selecting switch 3 generates a size number signal corresponding to the size number of the gas meter. An operating device 8 computes the flow rate from the flow rate pulses of the sensor 2 and the size number signal of the switch 3, and has a zero judging part 9, which judges the zero flow rate based on the time interval of the flow rate pulses. The judging point 9 is constituted by the following parts: a time setting device 10, which receives the size number signal and outputs a zero judging signal; a timer 5, which measures the time interval of the flow rate pulses; and a comparator 11, which compares the time interval of the flow rate pulses with the zero judging time and outputs a zero flow rate signal when the interval is longer. Therefore, the zero judging flow rate can be made constant regardless of the size number of the meter used.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flow rate measuring device that uses a gas meter to measure the flow rate per unit time.

Structure of a conventional example and its problems As a conventional flow rate measuring device, for example, as shown in FIG. 1, a gas meter 1 is provided with a flow rate sensor 2 that transmits a flow rate pulse in accordance with the measurement by the gas meter. This flow i sensor is composed of a magnet installed in a link mechanism that responds to the membrane 71 of the gas meter 1, and a magnetic field generator that generates the magnetic field of this magnet. A pulse of 1 nogle is output. The flow rate flowing through the scale 1 in one round trip of the metering membrane, that is, the unit metered volume fu changes depending on the meter number. For example, the fu of the N type No. 2 meter is 0.6t, and the fu of the No. 7 meter is 1.7t. Therefore, a number selection switch 3 for weighting the flow rate pulses is provided, and based on the flow rate pulse and the number signal which is the output of the υ number selection switch 3, the calculation device 4 calculates the flow rate at the opening time of approximately cIt. Calculate. The arithmetic unit 4 is provided to determine whether the flow is alright or not.
A timer 5 that determines the flow rate pulse time) *, A k l'll'1, and a determiner 6 that generates a zero flow signal when the timer interval measured by the timer 5 exceeds a predetermined time of 10. The Z/V determination section 7 makes a determination.

” The disadvantage of the double cello determination unit is that the predetermined time TO for upper mouth determination is constant, so the flow rate at which the flow rate is zero is the meter j.
;j- varies depending on the number. That is, N type 2
For the No. 7 meter, a flow rate of 0.67To or less is zero flow rate, but for the No. 7 meter, a flow rate of 1.77To or less is zero flow rate.

Purpose of the Invention The present invention solves the above-mentioned drawbacks of the conventional art, and provides a flow rate measuring device in which the sero-judgment flow rate is constant regardless of the make-up number and regardless of the number of gas makes used. With the goal.

Structure of the Invention, Shigeru Achieving the Second Object, Flow Measuring Device of the Present Invention) 47
．． J consists of a time setter that receives the number signal and outputs the zero judgment time, a timer that measures the entire time interval of the flow rate pulse, and a timer that measures the entire time interval of the flow rate pulse, and compares the zero judgment time and the flow rate pulse interval. ≧In the former case, it is composed of a comparator that outputs an upper flow rate signal, and the time setting device is, for example, 2
Since the zero judgment time for a No. 2 meter is 6 minutes and 17 minutes for a No. 7 meter, the zero judgment flow rate is 7 minutes even for a No. 2 meter.
Description of 33 Embodiments in which the zero judgment flow 11 (is constant even when the meter number is 0.1 t1 minutes and is constant even if the meter number changes) An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, the same number +3- as in FIG. 1 indicates the same thing. 8 is an arithmetic unit that calculates the flow rate per unit time from the flow fi pulse from the flow mll center and the number I1 and number from the number selection switch 3. Be equipped. The cell determination unit 9 sets the LU to the flow j1 (pulse I(, timer 5 for determining the 5-interval failure, and number C-T';).
:This is a device that outputs time and money for Hiro judgment, for example, if the number signal is No. 2, it is 6 minutes, and if it is No. 7, it is 17 minutes. Consisting of a comparator 11 that compares the flow rate pulse interval and zero judgment time 1'
,ru.

The following is a theory regarding the composition of JtJK in Nikkizosei.

Suppose now that the number 10 of the Ganumeter is 2. +j times the signal No. 2, and accordingly, the time setter 10 outputs the zero determination time T'o2, for example, 6 minutes. If the flow rate pulse interval TF measured by the timer 5 is shorter than 6 minutes, the comparator 11 will set the value TF(Ta2).
Flow 11 (does not output. When the flow rate pulse interval TF becomes 6 minutes or more, TF≧To2, so the comparator 11 outputs zero flow rate. In this case, the flow rate J is 0.6t.
/6 minutes - 0, 117 minutes.

Next, if the number of gas meter 1 is 7-, time setting 2
．． If No. 10, the zero judgment time To7 is set accordingly, for example, 17.
Output the minutes. Therefore, the zero judgment flow 1j (is 1
．． 7t/17min = o, 1b/min, which is the same as in the case of No. 2 meter.

As described above, according to this embodiment, the effect of making the zero determination flow rate constant regardless of the meter number is achieved.

In the embodiments described above, a zero determination section is provided, but if the arithmetic unit is constituted by a microcomputer, it may be provided within the microcomputer.

As described above, according to the present invention, even if the meter number changes,
A flow i11 measuring device is obtained in which the zero determination flow rate ii is constant.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional flow rate measuring device, and No. 21 is a block diagram of a cello determining section of a flow rate measuring device according to an embodiment of the present invention. 1...Gas meter, 2...Flow rate range, 3...Number selection switch, 5...Timer, 8...Arithmetic unit, 9... Zero +il constant part, 10--41, 111 setting 21K, 11... comparator.

Claims (1)

[Claims] a flow rate sensor attached to the gas meter and transmitting a flow rate pulse according to the metering of the gas meter; a number selection sensor that generates a number signal according to the meter number of the gas meter; and the flow rate pulse and the number signal. and an arithmetic device comprising a zero determination unit that calculates the flow rate from the flow rate and determines the zero flow rate from the time interval of the flow rate pulse, and the zero determination unit outputs the zero determination time upon receiving the previous symbol number signal. a time setter that measures the time interval of the flow rate pulse, a timer that measures the time interval of the flow rate pulse, and a comparator that compares the zero determination time and the flow rate pulse time interval and outputs a zero flow rate signal when the latter is longer than the J resistance. Configured flow measurement device.