JPS5826224A - Detection of abnormality in measuring in fluid measuring device - Google Patents

Abstract

PURPOSE:To detect the abnormality in a flow measuring system in the case of connecting plural flowmeters of the same capability in parallel and adding and displaying the values of the respective flowmeters by announcing the difference or ratio in the measured values exceeds a specified value. CONSTITUTION:An oil lifting pipe 1 communicated with a tank not shown is connected via a pump 3 to branch pipes 2a, 2b. After flow rates are measured with flowmeters 5a, 5b having pulse transmitters 6a, 6b, the pulse are supplied to an oil feed pipe 8. The outputs of the transmitter 6a, 6b are displayed 16 with a selecting circuit 14 and a display driving circuit 15 after counting 11a, 11b and adding 12. The outputs of the circuits 11a, 11b are inputted to the circuit 14 and a comparator 13. If there is more than a specified difference in the count values of the flowmeters 5a, 5b, alarm 19 is raised through a driving circuit 18. Thus if there is abnormality in one of the flowmeters 5a, 5b, said abnormality is detected by the alarm 19.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting measurement abnormality in a fluid metering device.

In a fluid needle metering device, such as a gasoline metering machine, high speed 1
[In order to produce a large amount of oil supplied per unit time, a flow rate needle with higher capacity than the standard flow rate needle installed in the standard specification refueling machine is required. However, since it is undesirable to specially manufacture flow rate needles with different specifications from the viewpoint of manufacturing costs and management, it is desirable to increase the capacity by combining multiple values of standard specification flow rate needles.

The present invention provides a method for detecting when a failure or abnormality occurs in one flowmeter, one transmitter, or a metering system including a counting circuit in a fluid needle metering device equipped with a plurality of flow rate needles of the same capacity. ◇ A detailed explanation will be given with reference to the drawings.

Reference numeral 1 denotes an oil pump pipe, the lower part of which communicates with an underground tank (not shown), and the upper end of which is divided into two branch pipes 2ax2b.

3 is the oil supply pump inserted into the pumping pipe 1, 4 is the pump motor, 5as5b is the first and second flow rate needle inserted into the branch pipe 2ax2b, respectively, and 6a s 6b is the measured value of the flow rate needles 5a and 5b, respectively. The flow rate pulse (Ij
l t )f l/1 pulse per 100 liters) B&,
first and second flow pulse transmitters, complete with B'b;
7 is a communication pipe VavbSvo that connects the primary side of the flowmeter 5a of the branch pipe 2a and the secondary side of the flowmeter 5b of the branch pipe 2b.
are valves inserted into the branch pipe 2as2b and the communication pipe 7, respectively.

The branch pipes 2a and 2b are combined to form an oil supply pipe 8, which is connected to a known oil supply nozzle (not shown) via a hose (not shown).

Reference numeral 9 denotes a nozzle detection switch, which is installed, for example, in a nozzle case provided in the housing of a ground-mounted refueling machine, and is operated by hooking and unhooking the nozzle to the nozzle case. When the nozzle is removed from the nozzle case, the signal from the nozzle detection switch (nozzle signal) rises (becomes H), and when the nozzle is returned to the nozzle case, the nozzle signal falls (becomes L).

The nozzle signal H causes the motor control circuit 10 to energize the pump motor number, and also causes the first and second counting circuits 11
a %llb , the adder circuit 12 and the comparator circuit 13 are set to 9. The nozzle signal IL causes the motor control circuit 1o to de-energize the motor 4.

Normally, the valves V5LzVb are open and the valve VO is closed. When the nozzle is removed from the nozzle case and the nozzle tip is inserted into the tank to be refueled to perform refueling, the flow rate pulses transmitted from the pulse transmitter 6ax6b as refueling progresses. is the stitch count circuit 11
The number of stitches is determined by axllb. The counting output signals Oa, Ob
is added by the area calculation circuit 12 and the addition result (oil supply amount) signal p
is input to the display drive circuit 15 via the switching circuit 14,
The amount of refueling (and the amount of refueling It if necessary) is displayed on the display 16.
will be displayed. This toggle switching circuit 14 is a switch 1
L0 stitch count circuit 11a,
The count output signal [0aSOb of 11/b is also input to the comparison circuit 13 and the switching circuit 14.

The comparison circuit 13 outputs Ryoga4! at all times or at regular intervals. joa
and Ob are compared, and if there is a difference of more than a certain value between the two, an abnormality detection signal 1 is output, and the alarm drive circuit 18 makes an alarm ll1.
19 to perform the notification operation.

The comparison by the comparison circuit 13 can be performed, for example, by using the signal 4jo3 as a reference and determining the ratio or difference between the signal Ob and the signal Ob. For example, each time the signal Oa reaches a certain value (for example, every 1 liter), the difference between the two signals Oa and Ob is determined.

The abnormality detection signal I is also input to the motor control circuit 10 to stop the motor 4.

Then, return the nozzle to the nozzle case and close the valve Va.

Close vb, open vO, and connect flowmeters 5a and 5b to connecting pipe 7.
The switching circuit 14 is switched by the changeover switch 17 so that, for example, the output Oa of the counting circuit 11a is guided to the display drive circuit 15, and the nozzle is removed from the nozzle case to return the counting circuits 11&, 11b to zero. and operate the nozzle to supply a certain amount of oil. The amount of oil supplied is displayed on the display 1116 as a measured value by the flow meter 5a depending on the switching state of the switch 14.

The above-mentioned fixed amount of oil supply is also measured as the same amount of oil supply by a flowmeter 5b connected in series with the flow rate needle 5a. Therefore, the changeover switch 17 is changed to guide the count output signal ob of the meter k circuit 1 to the display drive circuit 15, and the measured value of the flowmeter 5b is displayed on the display w16.

Furthermore, signal 06. , Ok) is selectively input to the display drive circuit 15#c via the switching circuit 14, when the changeover switch 1F is operated, 1 becomes the signal 1 of the changeover switch 17.
Therefore, the comparison circuit 13 does not perform a comparison operation.

If there is a difference greater than the allowable value between the previous display value (measurement value of flowmeter 5a) and the current display value (measurement value of flowmeter 5b), either one of the measurement systems (flow rate needle, flow rate pulse) It is judged that there is a failure or abnormality in the transmitter, counting circuit section)
It is possible to detect which system has an abnormality by comparing it with the measured value at .

In the above embodiment, only two flowmeters, that is, two measurement systems are provided, but 3II or more flowmeters may be provided.

In this case, the comparison circuit 13 may be configured to use any one system as a reference and compare the measured values of that system simultaneously or sequentially with the measured values of the other systems.

As described above, according to the present invention, ? ll1ll
! In a fluid metering device having several metering systems, abnormalities in each metering system can be easily detected.

[Brief explanation of the drawing]

The figure is a plotter diagram showing an example of an apparatus for carrying out the method of the present invention. N 1...Fist pump, 2...l pump motor, 5a
15b...Flow rate needle, 6a, 6be...Flow rate pulse transmitter, 9...Nozzle detection switch, 10---Motor control circuit 11a% llb...Fist meter enemy circuit, 12.Contest-addition circuit-13 Jin: Comparison circuit, 14: Switching circuit, 1
5 proboscis...display device drive circuit, 16...-display device,'
17-.6 changeover switch, 18... Alarm-drive circuit, 19... Alarm.

Claims (1)

[Claims] In a fluid measuring device in which multiple flow rate needles of the same capacity are connected and arranged in parallel and the measured values of each flow rate needle are added and displayed, when the difference or ratio of the measured values of the flow rate needles exceeds a certain value. , a measurement abnormality detection method characterized in that this is notified.