JPH09188400A - Oil supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent oil liquid, in the form of vapor, from being mixed into exhausted compressed air so that the oil is wasted by providing a sensing means for sensing whether or not a diaphragm of a diaphragm pump is broken. SOLUTION: An oil supply device 1 includes a diaphragm pump 12 for sending oil liquid to an underground tank 2. A bubble sensing sensor unit 25 for sensing bubbles mixed into oil liquid is provided at the upper end of a vertical pipe 11a of oil pipe 11 through which oil liquid delivered from the pump 12 flows. Ultrasonic waves transmitted from an ultrasonic wave transmitter are propagated through oil liquid flowing through the pipe 11 and received by an ultrasonic wave receiver. Since ultrasonic waves advance at a velocity corresponding to the density of the oil liquid flowing in the pipe 11, the time it takes for the ultrasonic waves to be received after being transmitted is measured, whereby whether or not the diaphragm of the pump 12 is broken and bubbles are mixed into the oil liquid can be judged from the variation of measured phase difference (time differential).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refueling device, and in particular, an air-driven diaphragm pump is installed in an underground tank of a gas filling station, and an oil liquid stored in the underground tank by the operation of the diaphragm pump is used as a weighing machine. The present invention relates to an oil supply device configured to deliver liquid.

[0002]

2. Description of the Related Art In a gas station where a plurality of weighing machines for measuring oil liquid and supplying oil from a refueling nozzle are installed, an underground tank for storing oil liquid is buried underground for each oil type.
The oil liquid in the underground tank is sent to the refueling nozzle to refuel the fuel tank of the vehicle. Further, in each of the weighing machines installed in the fueling station, a suction pump driven by a flow meter or an electric motor is arranged in a liquid supply conduit communicating with each fueling nozzle.

In each of the weighing machines, when the fueling nozzle is removed from the nozzle hook of the weighing machine, the motor of the suction pump is activated and the suction pump sucks up the oil liquid in the underground tank and sends it to the fueling nozzle. It is designed to be liquid (see Japanese Utility Model Publication No. 39-34012).

However, in a fueling device having such a weighing machine and an underground tank, it is necessary to store the electric motor in an explosion-proof case in order to prevent ignition by the electric motor, and together with this, the flow rate inside each weighing machine. A meter and a bubble separator must be provided. Therefore, in a weighing machine having a plurality of refueling hoses and refueling nozzles, there is a problem that the internal structure becomes complicated and the size becomes large.

In view of the above-mentioned conventional techniques, it has been considered to simplify the structure of the weighing machine by installing an electric pump unit in the underground tank. For example, as disclosed in Japanese Unexamined Patent Publication No. 48-49014, a pump unit including an electric motor and a suction pump is built in an underground tank, and an oil liquid is supplied from the pump unit to each oil supply nozzle of a plurality of weighing machines. There is a configuration for sending the liquid.

[0006]

However, when the electric pump unit is installed in the underground tank as in the conventional case, there are the following problems. Since the oil supply device using the electric pump unit is installed in an oil liquid having flammability, it is necessary to have an explosion-proof structure in order to prevent sparks of the electric motor from catching the oil liquid. For the same reason as above, various safety measures are necessary. When there is a power failure, the pump unit does not work and refueling becomes impossible. Since a fixed amount is constantly discharged when the pump is driven, a relief mechanism (passage) is required, which requires waste of power consumption and adjustment of the relief pressure of the relief mechanism (even if the electric pump unit is built into the weighing machine. Similarly, relief pressure adjustment is required). To prevent the pump temperature from rising, it is necessary to take measures to prevent idling.

As described above, the conventional refueling device causes a cost increase due to the above reasons, and the cost advantage, which is the original purpose, is lost. At the gas station, the size of the underground tank tends to increase, and the conventional electric pump unit has a limited head and cannot cope with this.

Therefore, in order to solve the above-mentioned problems (1) to (3), the present applicant has decided to install an air-driven diaphragm pump in the underground tank instead of the conventional electric pump unit to send the oil liquid. Are considering. However, since this air-driven diaphragm pump does not generate sparks unlike the electric type, there is no need to worry about safety measures, but since the diaphragm is reciprocally driven in oil liquid, it has been used for a long time. In this case, the diaphragm made of rubber or ethylene tetrafluoride resin may be cracked and damaged.

In this case, the compressed air for driving leaks from the damaged portion of the diaphragm and is mixed in the oil liquid to be fed, and as a result, the oil liquid containing bubbles is discharged from the oil supply nozzle. Therefore, there is a problem that the measured value of the flow meter and the actually supplied flow rate do not match.

Further, there is a problem that the oil liquid flows out from the damaged portion of the diaphragm and is mixed with the exhausted compressed air in the form of oil vapor to be wasted. Then, an object of the present invention is to provide an oil supply device which solved the above-mentioned problem.

[0011]

In order to solve the above problems, the present invention has the following features. Claim 1
The invention of (1) provides an air-driven diaphragm pump in a tank in which oil liquid is stored, and in the oil supply device that drives the diaphragm pump to send the oil liquid in the tank to a measuring machine, the diaphragm of the diaphragm pump is It is characterized in that a detecting means for detecting whether or not it is broken is provided.

Therefore, according to the first aspect, it is possible to detect whether or not the diaphragm of the diaphragm pump is damaged. Therefore, when the diaphragm is damaged, replacement work can be performed immediately. Further, the invention of claim 2 is characterized in that the detecting means is an ultrasonic sensor for detecting the density of the oil liquid flowing through the liquid supply pipe line connected to the discharge port of the diaphragm pump. .

Therefore, according to the second aspect of the present invention, by detecting the density of the oil liquid flowing through the liquid feed pipe line connected to the discharge port of the diaphragm pump by the ultrasonic sensor, the compressed air for driving is supplied to the diaphragm pump. It is possible to reliably and safely detect that the diaphragm has leaked into the oil liquid, and to notify that the diaphragm has been damaged.

Further, the invention according to claim 3 is characterized in that the detecting means is an optical sensor for detecting the transmittance of the oil liquid flowing through the liquid supply pipe line connected to the discharge port of the diaphragm pump. It is a thing. Therefore, according to the third aspect, by detecting the permeability of the oil liquid flowing through the liquid supply line connected to the discharge port of the diaphragm pump, the compressed air for driving is supplied from the damaged portion of the diaphragm of the diaphragm pump to the oil liquid. It is possible to reliably and safely detect that the diaphragm has leaked into it, and to notify that the diaphragm has been damaged.

According to a fourth aspect of the present invention, the detection means determines whether the diaphragm of the diaphragm pump is damaged due to the difference between the amount of air supplied to the diaphragm pump and the amount of exhaust gas exhausted from the diaphragm pump. The feature is to detect whether or not.

Therefore, according to the fourth aspect, it is possible to detect that the diaphragm of the diaphragm pump is damaged from the difference between the amount of air supplied to the diaphragm pump and the amount of exhaust gas exhausted from the diaphragm pump.
It is possible to reliably and early detect that the driving compressed air is flowing into the oil liquid from the diaphragm-damaged portion of the diaphragm pump, and notify that the diaphragm has been damaged.

Further, the invention of claim 5 is characterized in that the detecting means detects whether or not the diaphragm is broken based on a change in the cumulative flow rate of the oil liquid with respect to the number of reciprocating movements of the diaphragm. Is. Therefore, according to the fifth aspect, it is possible to detect that the diaphragm is broken based on the change in the cumulative flow rate of the oil liquid with respect to the number of reciprocating movements of the diaphragm. Therefore, the oil liquid is flowing out from the damaged portion of the diaphragm of the diaphragm pump. Can be detected reliably and early to notify that the diaphragm is damaged.

Further, the invention of claim 6 is characterized in that the detecting means detects whether or not the diaphragm is damaged based on a change in the cumulative flow rate of air with respect to the number of reciprocating movements of the diaphragm. is there. Therefore, according to the sixth aspect, it is possible to detect that the diaphragm is damaged based on the change in the integrated flow rate of air with respect to the number of times the diaphragm is reciprocated. Therefore, it is ensured that the air is flowing out from the damaged part of the diaphragm of the diaphragm pump. Moreover, it is possible to detect it early and notify that the diaphragm is damaged.

Further, in the invention of claim 7, the detecting means measures the oil vapor concentration in the air exhausted from the diaphragm pump to detect whether or not the oil liquid is mixed in the exhaust. It is a feature. Therefore, claim 7
According to the method, the concentration of oil vapor in the air discharged from the diaphragm pump can be measured to detect that the oil liquid is mixed in the exhaust gas.Therefore, it is possible to confirm that the oil liquid is flowing out from the damaged diaphragm part of the diaphragm pump. It is possible to reliably and easily detect and notify that the diaphragm is damaged.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an oil supply device according to the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing a schematic configuration of a first embodiment of an oil supply apparatus, FIG. 2 is a block diagram showing an attachment state of a bubble detection sensor of the first embodiment, and FIG. 3 is a connection state of respective devices of the first embodiment. It is a block diagram showing.

A refueling device 1 installed at a gas filling station feeds the oil liquid of an underground tank 2 buried underground in the gas filling station to a plurality of weighing machines 3 installed on the ground to supply a fuel tank of a vehicle (see FIG. (Not shown). Each of the weighing machines 3 is provided with a plurality of oil supply pipelines 4, and each is connected to an oil supply hose 5 and an oil supply nozzle 6. The fueling nozzle 6 is
It is hooked on a nozzle hook 7 provided on the side surface of the weighing machine 3 except during the fueling work.

A flow meter 8, a strainer 9, and a valve 10 are arranged in each oil supply pipe line 4. Furthermore, the lower end of each oil supply pipeline 4 is connected to the liquid supply pipeline 11 buried in the ground, and the end of the liquid supply pipeline 11 extends into the underground tank 2. An air-driven diaphragm pump 12 is installed at the bottom of the underground tank 2. Since the oil liquid is stored inside the underground tank 2, the diaphragm pump 12 is provided in a state of being submerged in the oil liquid, but since it is an air-driven system, it has a structure that does not generate sparks like the electric type. Yes Safety is ensured. The structure of the diaphragm pump 12 will be described later.

In the middle of the vertical line 11a of the liquid feed line 11 extending vertically from the upper part of the diaphragm pump 12 and the horizontal line 11b to which the oil supply line 4 is connected, the diaphragm pump 12 operates. An accumulator 13 for absorbing pulsation generated when the oil liquid in the underground tank 2 is sent to the weighing machine 3 is provided. Further, in the middle of the oil supply pipe line 4, a pipe line 14 for returning the oil liquid remaining in the oil supply pipe line 4 to the underground tank 2 at the time of repair or inspection of the weighing machine 3 is branched and connected. A valve 15 arranged in the pipeline 14.
Is normally closed and is opened when the weighing machine 3 is repaired or inspected.

At the upper end portion of the vertical pipe line 11a of the liquid feed pipe line 11 through which the oil liquid discharged from the diaphragm pump 12 flows, a bubble detection sensor unit 25 for detecting the inclusion of air in the oil liquid is provided. It is arranged. As shown in FIG. 2, the bubble detection sensor unit 25 has, for example, a configuration including an ultrasonic sensor, and the ultrasonic transmitter 25a and the ultrasonic receiver 2 are provided at a position of 180 degrees on the outer circumference of the liquid supply conduit 11.
5b and are attached.

Ultrasonic transmitter 25a and ultrasonic receiver 25b
Are provided so as to face each other, and when an oscillation signal from the oscillator 26 is output to the ultrasonic transmitter 25a, ultrasonic waves of the frequency set by the oscillator 26 are transmitted from the ultrasonic transmitter 25a. . The ultrasonic wave transmitted from the ultrasonic wave transmitter 25a propagates through the oil liquid flowing through the liquid supply conduit 11 and is received by the ultrasonic wave receiver 25b.

Reference numeral 27 is a phase comparator, which is an ultrasonic transmitter 25a.
Measures the time from when the ultrasonic wave is transmitted to when the ultrasonic wave is received by the ultrasonic wave receiver 25b. Since the ultrasonic waves travel at a propagation speed according to the density of the oil liquid flowing through the liquid supply conduit 11, the ultrasonic wave propagation speed becomes slow when a large amount of bubbles are mixed in the oil liquid. Therefore, it is possible to determine from the change in the phase difference (time difference) measured by the phase comparator 27 whether or not air bubbles are mixed in the oil liquid.

Therefore, when a large amount of air bubbles are mixed in the oil liquid fed through the liquid feed conduit 11, the density of the oil liquid changes and the ultrasonic wave propagation speed, that is, the ultrasonic receiver 25b. Since the time until it is received changes, the presence / absence of bubbles can be detected by the bubble detection sensor unit 25.
Therefore, the diaphragm 4 of the diaphragm pump 12
When the compressed air leaks into the oil liquid due to breakage of the valves 6, 47 (see FIG. 4 described later), the output (phase difference) from the phase comparator 27 changes. Therefore, by checking the change in the output from the bubble detection sensor unit 25, it is possible to determine whether or not the diaphragms 46, 47 are damaged.

The diaphragm pump 12 has an air supply line 1 for supplying driving air in addition to the oil supply line 4.
6 and the exhaust pipe line 17 for exhaust are connected. Each of the pipelines 4, 16 and 17 extends vertically from the upper portion of the diaphragm pump 12 and is provided with a recess 1 provided on the ground of the gas station.
It has grown to eight.

The air supply conduit 16 has a vertical conduit 16a extending vertically from the diaphragm pump 12 and the recess 1
It is composed of a horizontal conduit 16b which is bent in the horizontal direction from 8 and extends into the building 19. The end of the horizontal pipeline 16b is a tank 20a of the compressor 20 installed in the building 19.
It is connected to the discharge port provided in.

Further, the horizontal pipeline 1 near the compressor 20
An on-off valve 21 and a control valve 22 which are electromagnetic valves are arranged at 6. That is, the diaphragm pump 12 is driven by supplying compressed air as a drive source when the opening / closing valve 21 is opened, and is brought into a stopped state by closing the opening / closing valve 21. Therefore, when any one of the oil supply nozzles 6 of each weighing machine 3 is removed from the nozzle hook 7, the opening / closing valve 21 is opened and the diaphragm pump 12 is driven, so that the oil liquid can be supplied to the oil supply nozzle 6. Become.

The control valve 22 is an adjusting valve for adjusting the pressure and flow rate of the compressed air supplied to the diaphragm pump 12, and the pressure and flow rate of the compressed air are controlled to predetermined values by controlling the valve opening. It is configured to be able to. Then, the diaphragm pump 12 is driven in a cycle (the number of reciprocations per unit time) according to the pressure and flow rate of the compressed air adjusted by the control valve 22.

In the diaphragm pump 12, the diaphragm reciprocates by the compressed air supplied from the compressor 20 to feed the oil liquid in the underground tank 2 and exhaust the used air to the exhaust pipe line 17. Further, a silencer 23 is connected to the upper end of the exhaust pipe line 17 to mute the sound generated as the air is discharged.

A control device 28 is arranged inside the building 19. As shown in FIG.
A CPU 29, a display unit 30, and an alarm unit 31 are provided in the CPU 29, and the CPU 29 has an opening / closing valve 21, a control valve 22, a bubble detection sensor unit 25, and a nozzle switch 32 of the nozzle hook 7 provided in each weighing machine 3. Are connected.

Here, the structure of the diaphragm pump 12 will be described. 4 is a vertical cross-sectional view of the diaphragm pump 12, and FIG. 5 is a vertical cross-sectional view of the automatic air valve of the diaphragm pump 12 taken along the line AA in FIG. The diaphragm pump 12 includes the first and second casings 3 arranged on the left and right.
First and second pump chambers 37 and 38 are provided inside the valves 5 and 36, and an automatic air valve 39 is provided between the casings 35 and 36. Further, the casings 35, 36
The suction side manifold 40 for sucking the oil liquid is provided in the lower part of the
And a discharge side manifold 41 for discharging the oil liquid is connected to the upper portions of the casings 35 and 36.

Suction port 35 of casings 35 and 36
a, 36a, connection ports 40a, 41a, 40b of the manifolds 40, 41 connected to the discharge ports 35b, 36b,
Ball-shaped check valves 42 to 45 are provided at 41b. Further, the pump chambers 37 and 38 are made of rubber or tetrafluoroethylene resin and have first and second diaphragms 46 and 4, respectively.
It is partitioned by 7, and is provided between the diaphragms 46, 47 and the lids 48, 49 of the casings 35, 36 for the first and second parts.
The diaphragm chambers 50 and 51 are formed.

The diaphragms 46, 47 are clamped on the outer peripheral side between the casings 35, 36 and the bowl-shaped lids 48, 49, and on the inner peripheral side by the disc-shaped gripping portions 52, 53. The grips 52, 53 are formed by the casings 35, 3
It is fixed to both ends of a rod 54 penetrating between 6 and can reciprocate in the left-right direction in the figure together with the rod 54.

The diaphragms 46 and 47 are the holding members 5
2, 53 and the casings 35, 36 are attached in a bent state in an arc shape, and are flexible because they are made of rubber or tetrafluoroethylene resin. It is transformed by the supply and discharge of compressed air.

The compressed air is alternately supplied to the diaphragm chamber 50 or 51 by the switching operation of the automatic air valve 39, so that the rod 54 slides in the left-right direction (X direction) in the drawing and the pump chambers 37, 38. The volume of is alternately expanded or reduced. Along with this, the oil liquid in the underground tank 2 is sucked from the suction port 40c of the suction side manifold 40 and flows into the pump chamber 37 or 38. Then, the rod 54 and the grips 52, 53 slide in the opposite directions, so that the oil liquid sucked into the pump chamber 37 or 38 flows out to the discharge side manifold 41, and then flows from the discharge port 41c to the liquid supply conduit 11. Is ejected.

Further, the automatic air valve 39 is provided in the casing 35.
And a bearing 56 for slidably supporting the rod 54 in a center block 55 interposed between
First supply / discharge passage 57 communicated with the diaphragm chamber 50 of
, A second supply / discharge passage 58 communicating with the second diaphragm chamber 51, and a first and a second communicating with the space 59 and the cylinder 64.
Second communication paths 59a and 59b are provided.

Further, an exhaust port 60 is provided above the space 59 formed inside the center block 55. The exhaust port 60 is provided with a ball-shaped check valve 61 and is connected to the exhaust pipe line 17. An air switching unit 62 is integrally provided behind the center block 55. The air switching unit 62 includes a cylinder 64 formed to extend in the vertical direction, a piston 65 sliding in the cylinder 64 in the vertical direction, and a compression generated by the compressor 20 via the air supply conduit 16. Air cylinder 6
4 and an air supply path 66 that leads into the interior of the vehicle.

A strainer 67 is provided in the air supply passage 66 for preventing foreign matter from entering, and an air inlet 68 to which the air supply conduit 16 is connected is provided above the strainer 67. . The piston 65 receives the compressed air supplied from the air supply passage 66 from the upper chamber 64 of the cylinder 64.
A first air passage 65a leading to a and a second air passage 65b guiding the compressed air supplied from the air supply passage 66 to the lower chamber 64b of the cylinder 64 are provided extending in the vertical direction in the figure. ing. A guide rod 68 protruding from the upper portion of the cylinder 64 is inserted into the first air passage 65a to prevent the piston 65 from rotating in the cylinder 64.

Further, the piston 65 has a switching port 65c for communicating the supply / discharge passage 57 and the communication passage 59b of the center block 55 or the communication between the supply / discharge passage 58 and the communication passage 59a. This switching port 65c is a piston 65
It is formed in a U shape inside, and when the piston 65 moves to the upper end position, it connects the first supply / discharge passage 57 and the second communication passage 59b, and when the piston 65 moves to the lower end position. The second supply / discharge passage 58 communicates with the first communication passage 59a.

An air supply groove 65d communicating with the air supply passage 66 is provided on the outer circumference of the piston 65.
The air supply groove 65d supplies and discharges the air supplied from the air supply passage 66 according to the sliding position of the piston 65.
Alternatively, the air supply system path is switched so as to supply the air to 58.

The center block 55 includes the cylinder 6
First exhaust passage 6 that communicates the upper chamber 64a of the No. 4 with the bearing 56.
9 (shown by a broken line in FIG. 5) and the lower chamber 64b of the cylinder 64.
And a second exhaust passage 70 (indicated by a broken line in FIG. 5) communicating with the bearing 56. FIG. 6 shows the bearing 56 and the automatic air valve 3.
It is sectional drawing which shows the structure of 9.

Grooves 56a to 56d are provided at predetermined intervals on the inner circumference of the bearing 56. The exhaust passages 69 and 70 are in communication with the grooves 56b and 56c that are open to the inner circumference of the bearing 56. Further, the exhaust ports 71, 72 are communicated with the grooves 56 a, 56 d that open to the inner circumference of the bearing 56. And
The exhaust passages 69 and 70 are opened and closed by the sliding positions of the small diameter portions 54a and 54b provided on the outer periphery of the rod 54, and
The exhaust ports 71 and 72 opening to the outer periphery of the bearing 56 are communicated with each other through the small diameter portions 54a and 54b. Therefore, as the rod 54 slides in the X direction, the air in the upper chamber 64a or the lower chamber 64b of the cylinder 64 is discharged to the exhaust port 71 or 7.
2 flows into the space 59 of the center block 55 and is exhausted from the exhaust port 60 to the exhaust pipe line 17.

Next, the operation of the diaphragm pump 12 having the above structure will be described. 7 to 9 are process diagrams for explaining the operation of the diaphragm pump 12. 6, in the automatic air valve 39, the compressed air supplied through the air supply pipe 16 is supplied to the upper chamber 64a of the cylinder 64, and the piston 65 moves downward. At this time, since the switching port 65c of the piston 65 communicates the first supply / discharge passage 57 with the second communication passage 59b, the air in the first diaphragm chamber 51 passes through the first supply / discharge passage 57. Then, it is discharged into the space 59 of the center block 55 and is discharged into the atmosphere through the exhaust port 60 and the exhaust pipe line 17.

At the same time, the compressed air supplied from the air supply pipe 16 passes through the second supply / discharge passage 58 via the air supply groove 65d of the piston 65 and is supplied to the second diaphragm chamber 52. As a result, as shown in FIG. 7, the volume of the first diaphragm chamber 51 is reduced, the volume of the second diaphragm chamber 52 is increased, and the rod 54 is moved to the second position.
Slide to the diaphragm chamber 52 side. At this time, the first diaphragm 46 changes to a state of being recessed toward the first diaphragm chamber 51 side, and the second diaphragm 47 changes to a state of expanding to the second pump chamber 38.

By the operation of the rod 54, the first diaphragm 46 and the second diaphragm 47 as described above, the first
In the pump chamber 37, since the volume of the first diaphragm chamber 51 is reduced and the volume is increased to generate negative pressure, the check valve 42 on the suction side is opened and the oil in the underground tank 2 is opened. The liquid is sucked into the first pump chamber 37 via the suction side manifold 40.

In the other second pump chamber 38, the second pump chamber 38
Since the volume of the diaphragm chamber 52 decreases due to the increase in the volume, the pressure in the second pump chamber 38 increases and the check valve 45 on the discharge side opens. Therefore, the second
The oil liquid sucked into the pump chamber 38 is discharged to the discharge side manifold 41, and is sent to the oil supply pipe line 4 of each weighing machine 3 via the liquid supply pipe line 11.

This completes the first half cycle of the diaphragm pump 12. In the next operation step, when the rod 54 slides toward the second pump chamber 38 side in FIG. 7,
The small diameter portion 54a of the rod 54 is formed in the grooves 56a and 56 of the bearing 56.
In order to communicate with b, the air in the upper chamber 64a of the cylinder 64 flows out to the grooves 56a and 56b of the bearing 56 through the exhaust passage 69, and the space 5 of the center block 55 from the exhaust port 71.
It is discharged to 9. This causes the piston 65 to start moving upward.

In the automatic air valve 39, the compressed air supplied through the air supply conduit 16 is supplied to the lower chamber 64b of the cylinder 64, and the air in the upper chamber 64a of the cylinder 64 is exhausted. , The piston 65 moves upward. At this time, the switching port 65c of the piston 65 is
As shown in FIG. 8, the second supply / discharge passage 58 and the first communication passage 5
9a, the second diaphragm chamber 52
Of the air passes through the second supply / discharge passage 58 and is discharged into the space 59 of the center block 55, and the exhaust port 60 and the exhaust pipe line 1
It is exhausted to the atmosphere via 7.

At the same time, the compressed air supplied from the air supply conduit 16 passes through the first supply / discharge passage 57 via the air supply groove 65d of the piston 65 and is supplied to the first diaphragm chamber 51. As a result, as shown in FIG. 9, the volume of the second diaphragm chamber 52 is reduced and the volume of the first diaphragm chamber 51 is increased, so that the rod 54 moves to the first position.
Sliding toward the diaphragm chamber 51 side. At this time, the first diaphragm 46 changes to a state in which it swells into the first pump chamber 37, and the second diaphragm 47 changes to a state in which it is recessed toward the second diaphragm chamber 52.

The operation of the rod 54, the first diaphragm 46 and the second diaphragm 47 as described above causes the second movement.
In the pump chamber 38, the volume of the second diaphragm chamber 52 is reduced and the volume is increased to generate a negative pressure. Therefore, the check valve 44 on the suction side is opened and the oil in the underground tank 2 is opened. The liquid is sucked into the second pump chamber 38 via the suction side manifold 40.

In the other first pump chamber 37, the first pump chamber 37
Since the volume of the diaphragm chamber 51 decreases as the volume of the diaphragm chamber 51 increases, the pressure in the first pump chamber 37 increases and the check valve 43 on the discharge side opens. Therefore, the first
The oil liquid sucked into the pump chamber 37 is discharged to the discharge side manifold 41, and is sent to the oil supply pipe line 4 of each weighing machine 3 via the liquid supply pipe line 11.

This completes the latter half cycle of the diaphragm pump 12. In the next operation step, when the rod 54 slides toward the first pump chamber 37 side in FIG. 9,
The small diameter portion 54b of the rod 54 is formed in the grooves 56c and 56 of the bearing 56.
In order to communicate with d, the air in the lower chamber 64b of the cylinder 64 flows out into the grooves 56c and 56d of the bearing 56 via the exhaust passage 70, and the space 5 of the center block 55 from the exhaust port 72.
It is discharged to 9. This causes the piston 65 to start moving downward.

Then, the state shown in FIG. 6 is restored again. By repeating the operations of FIGS. 6 to 9 in this manner, the rod 54, the first diaphragm 46, and the second diaphragm 47 reciprocate in the X direction to reciprocate in the first pump chamber 37 and the second pump chamber. At 38, the suction process and the discharge process are alternately performed. Therefore, the oil liquid alternately discharged from the pump chambers 37 and 38 is sent to the oil supply nozzle 6 of each weighing machine 3.

In the diaphragm pump 12 which performs the pumping operation as described above, since the diaphragms 46 and 47 reciprocate due to the supply of compressed air by the switching operation of the automatic air valve 39, the rubber diaphragm 4 is used when it is used for a long period of time.
Cracks may occur at 6, 47. In that case, the compressed air in the diaphragm chambers 51 and 52 leaks into the oil liquid in the pump chambers 37 and 38, and the oil liquid containing bubbles is discharged from the diaphragm pump 12.

Further, when the diaphragms 46, 47 are damaged, the oil liquid in the pump chambers 37, 38 is discharged from the diaphragm chamber 5.
The compressed air containing vapor and leaking into the exhaust pipe 1, 52
It will be exhausted to 7. Next, the CPU of the control device 28
The processing executed by 29 will be described with reference to the flowchart of FIG.

In step S1 (hereinafter "step" is omitted), the CPU 29 refuels the fuel tank of the vehicle.
It is determined whether or not is removed. That is, even if one of the fueling nozzles 6 of each weighing machine 3 has a nozzle hook 7
If the nozzle switch 32 is turned off, the nozzle switch 32 is turned off. Therefore, in S1, it is checked whether or not the nozzle switch 32 is turned off.

When one nozzle switch 32 is turned off in S1, the process proceeds to S2, and the opening / closing valve 21 arranged in the air supply pipe line 16 is opened. When the opening / closing valve 21 is opened, the compressed air generated by the compressor 20 is supplied to the automatic air valve 39 of the diaphragm pump 12 via the air supply pipe 16. Therefore, in the diaphragm pump 12, as described above, the rod 54, the first diaphragm 46, and the second diaphragm 47 reciprocate in the X direction to alternately suck in the first pump chamber 37 and the second pump chamber 38. The discharging step is performed.

At the next step S3, the liquid feed conduit 11 for feeding the oil liquid discharged from the diaphragm pump 12 to each measuring machine 3.
The output of the air bubble detection sensor unit 25 provided at is read. That is, since the bubble detection sensor unit 25 is configured by an ultrasonic sensor, the time (phase difference) Ta from the ultrasonic wave transmitter 25a transmitting the ultrasonic wave to the ultrasonic wave receiver 25b being phased is calculated. Read from the comparator 27.

In the next step S4, the current time (phase difference) Ta read from the phase comparator 27 is compared with a preset reference value (time (phase difference) measured without bubbles (phase difference)) T. . In the next S5, the comparison result of the two is Ta =
When T or Ta≈T, it is determined that bubbles are not mixed in the oil liquid discharged from the diaphragm pump 12, and the process proceeds to S6.

At S6, it is determined whether or not all the nozzle switches 32 provided on the nozzle hook 7 of each weighing machine 3 are turned on. That is, when all of the fueling nozzles 6 of each weighing machine 3 are not returned to the nozzle hook 7, the fuel is being refueled by any one of the plurality of fueling nozzles 6, and thus the above S
Returning to step 3, the processes of S3 to S6 are repeated. However, when all the fueling nozzles 6 of each weighing machine 3 are returned to the nozzle hook 7, the process proceeds to S7, and the opening / closing valve 21 arranged in the air supply pipe line 16 is closed. As a result, the diaphragm pump 12 is brought into a stopped state, and the liquid supply to each weighing machine 3 is stopped.

However, since the ultrasonic wave travels at a propagation speed according to the density of the oil liquid flowing through the liquid supply conduit 11, the ultrasonic wave propagation speed becomes slow when a large amount of bubbles are mixed in the oil liquid. Therefore, in S5, the comparison result between the current time (phase difference) Ta read from the phase comparator 27 and the preset reference value (time (phase difference) measured in the absence of bubbles) T is Ta. When> T, it is determined that bubbles are mixed in the oil liquid discharged from the diaphragm pump 12, and the process proceeds to S8.

Then, in S8, a message such as "the diaphragm of the diaphragm pump is damaged" is displayed on the display unit 30 and an alarm is issued from the alarm unit 31 to inform the operator that an abnormality has occurred in the diaphragm pump 12. To do. This allows the operator to recognize that the diaphragms 46 and 47 of the diaphragm pump 12 are damaged and air is mixed in the oil liquid, and to immediately perform repair work. Therefore, the diaphragm 4
It is possible to prevent the oil supply work from being performed without knowing that the 6, 6 and 47 are damaged, and the oil liquid containing bubbles is discharged from the oil supply nozzle 6 and the measured value of the flow meter 8 and the actually supplied oil flow rate. It is possible to solve the problem that and do not match.

Further, in the case of performing full tank refueling, full tank detection is performed by the rise of the liquid level at the refueling port. However, if the diaphragms 46, 47 are damaged and compressed air leaks into the oil solution, the oil solution is refueled. A large amount of bubbles will be generated on the liquid surface of the fuel tank that has been crushed. In this case, the automatic valve closing mechanism of the refueling nozzle 6 (which is well known and will not be described) will malfunction due to bubbles.

However, in the present embodiment, as described above, the diaphragm 46, 47 of the diaphragm pump 12 is constituted by the bubble detection sensor unit 25 composed of the ultrasonic sensor.
Since the damage is reliably and safely detected and notified, the replacement work of the diaphragms 46 and 47 can be immediately performed, and thereby the malfunction of the automatic valve closing mechanism of the fuel nozzle 6 can be eliminated.

FIG. 11 is a block diagram showing the essential parts of the second embodiment of the present invention. In the second embodiment, an optical sensor unit 75 is used instead of the ultrasonic sensor of the first embodiment to determine whether or not air bubbles are mixed in the oil liquid. FIG.
In No. 1, 76 is a light emitting element and 77 is a light receiving element. The light emitting element 7 is provided at a position of 180 degrees on the outer circumference of the liquid supply conduit 11.
6 and the light receiving element 77 are attached.

The light emitting element 76 and the light receiving element 77 are provided so as to face each other, and the light emitting element 76 to the light receiving element 7 are provided.
Light is emitted toward 7. The light receiving element 77 outputs a signal according to the intensity of the received light to the light receiving level determiner 78. The light receiving level determiner 78 determines the light receiving level based on the signal output from the light receiving element 77. That is, since the light from the light emitting element 76 has a light intensity corresponding to the light transmittance of the oil liquid flowing through the liquid supply conduit 11, when a large amount of bubbles are mixed in the oil liquid, the bubbles in the oil liquid are mixed. As a result, light is diffusely reflected, so that the light transmittance is lowered and the light receiving level of the light receiving element 77 is lowered.

Therefore, it is possible to determine whether the bubbles are mixed in the oil liquid from the change of the signal output from the light receiving element 77 by the light receiving level determination device 78. Therefore, when a large amount of air bubbles are mixed in the oil liquid sent through the liquid sending conduit 11, the light transmittance of the oil liquid is lowered and the light receiving level of the light receiving element 77 is lowered, so that the optical sensor The unit 75 can detect the presence or absence of bubbles. Therefore, when the diaphragms 46 and 47 of the diaphragm pump 12 are damaged and the compressed air leaks into the oil liquid, the output from the light receiving level determiner 78 changes. Therefore, it is possible to determine whether or not the diaphragms 46, 47 are damaged by checking the output change from the optical sensor unit 75.

Next, the processing executed by the CPU 29 of the control device 28 will be described with reference to the flowchart of FIG. Since S11 and S12 are the same as S1 and S2, the description thereof is omitted. In the next S13, the output of the optical sensor unit 75 provided in the liquid feed conduit 11 for feeding the oil liquid discharged from the diaphragm pump 12 to each of the weighing machines 3 is read. That is, the output from the light receiving level determiner 78 is read.

In next step S14, the light receiving level La of the light receiving element 77 is compared with a preset reference value L (light receiving level measured in a state without bubbles). In the next S15, when the comparison result of the both is La ≧ L, it is determined that no bubbles are mixed in the oil liquid discharged from the diaphragm pump 12, and the process proceeds to S16.

In S16, it is determined whether or not all the nozzle switches 32 provided on the nozzle hook 7 of each weighing machine 3 are turned on. That is, when all the fueling nozzles 6 of each weighing machine 3 are not returned to the nozzle hook 7,
Since any one of the plurality of refueling nozzles 6 is refueling, the process returns to S13 and the processes of S13 to S16 are repeated. However, when all the fueling nozzles 6 of each weighing machine 3 have been returned to the nozzle hook 7, the process proceeds to S17 and the air supply pipeline 1
The on-off valve 21 arranged at 6 is closed to stop the diaphragm pump 12.

However, in S15, the light receiving level La of the light receiving element 77 and the preset reference value L are set.
When the comparison result with (the light receiving level measured without bubbles) is La <L, it is determined that bubbles are mixed in the oil liquid discharged from the diaphragm pump 12, and the process proceeds to S18.

Then, in S18, a message such as "the diaphragm of the diaphragm pump is damaged" is displayed on the display unit 30 and an alarm is issued from the alarm unit 31 to inform the operator that an abnormality has occurred in the diaphragm pump 12. To do. In this way, the optical sensor unit 75
The diaphragms 46, 4 of the diaphragm pump 12
Since the damage of 7 is reliably and safely detected and notified, the operator can immediately perform the repair work of the diaphragm pump 12.

FIG. 13 is a block diagram of the third embodiment of the present invention. In FIG. 13, the same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. Reference numeral 81 denotes a flow meter for measuring the air supply amount, which is arranged in the air supply pipeline 16 downstream of the on-off valve 21 and the control valve 22.

Reference numeral 82 denotes a flow meter for measuring the amount of exhaust gas from the diaphragm pump 12, which is provided in the exhaust pipe line 17. In the third embodiment, when the diaphragms 46 and 47 are not damaged, the air supply amount and the exhaust amount are equal, but when the diaphragms 46 and 47 are damaged,
The presence or absence of damage to the diaphragms 46 and 47 is detected by utilizing the fact that the exhaust amount is smaller than the air supply amount. That is, when the diaphragms 46 and 47 of the diaphragm pump 12 are damaged and air leaks into the oil liquid, the control device 28 reduces the amount of air exhausted from the exhaust pipe line 17, and therefore the flow meter 81 on the supply side. The presence or absence of breakage of the diaphragms 46, 47 is detected by comparing the air supply amount measured by (1) with the exhaust amount measured by the exhaust side flow meter 82.

Next, the processing executed by the CPU 29 of the control device 28 will be described with reference to the flowchart of FIG. Since S21 and S22 are the same as S11 and 12, the description thereof is omitted. In the next S23, the air supply amount Q _A measured by the flow meter 81 on the supply side and the exhaust amount Q _B measured by the flow meter 82 on the exhaust side are read during a predetermined time (for example, about 1 minute).

In the next step S24, the air supply amount Q _A and the exhaust amount Q _B are compared. In the next S25, when the comparison result of both is Q _A ≈Q _B, it is determined that no bubbles are mixed in the oil liquid discharged from the diaphragm pump 12, and the process proceeds to S26. In S26, it is determined whether or not all the nozzle switches 32 provided on the nozzle hook 7 of each weighing machine 3 are turned on. That is, when all of the fueling nozzles 6 of each weighing machine 3 are not returned to the nozzle hook 7, it is in the process of refueling at any one of the plurality of fueling nozzles 6, so the process returns to S23 and the processes of S23 to S26. repeat. However, when all the oil supply nozzles 6 of each weighing machine 3 have been returned to the nozzle hook 7, the process proceeds to S27, the on-off valve 21 arranged in the air supply pipe line 16 is closed, and the diaphragm pump 12 is closed. To stop.

However, in S25, Q _A
> Q _B, that is, the displacement Q rather than the supply Q _{A
When B} is small, it is determined that bubbles are mixed in the oil liquid discharged from the diaphragm pump 12, and the process proceeds to S28. Then, in S28, a message such as "the diaphragm of the diaphragm pump is damaged" is displayed on the display unit 30 and an alarm is issued from the alarm unit 31 to notify the operator that an abnormality has occurred in the diaphragm pump 12.

As a result, the operator can recognize that the diaphragms 46, 47 of the diaphragm pump 12 are damaged and air is mixed in the oil liquid, and can immediately perform repair work. Further, there is a fixed proportional relationship between the integrated flow rate Q of the air supplied to the diaphragm pump 12 and the number N of times the diaphragm pump 12 is driven.

FIG. 15 is a graph showing the correlation between the cumulative flow rate Q per predetermined time and the pump driving frequency N. In this way, the relationship between the integrated flow rate Q and the number of times of driving the pump N can be represented by the graph I created based on the experimental data. Therefore, the diaphragm 4 of the diaphragm pump 12
In the case where Nos. 6 and 47 are not damaged, there is no air leakage, and therefore the graph I has a slope a.

However, when the diaphragms 46, 47 of the diaphragm pump 12 are damaged and air leakage occurs, the integrated flow rate Q with respect to the number N of times of driving the pump increases, so that the slope a of the graph I becomes large. Change to the area A side. Therefore, in S24 and S25, by comparing the slope a of the graph I with the reference value a _o (the slope measured in the state without bubbles), the diaphragms 46 and 4 are
7 can determine the presence or absence of damage. That is, a
= A _o , it is determined that the diaphragms 46, 47 are not damaged, and when a> a _o , the diaphragms 46, 47 are not damaged.
It can be determined that there is damage.

Further, there is a fixed proportional relationship between the integrated air consumption amount V used in the diaphragm pump 12 and the number N of times the diaphragm pump 12 is driven by the pump. FIG. 16 is a graph showing the correlation between the integrated air consumption amount V per predetermined time and the pump driving frequency N.

Thus, the relationship between the cumulative air consumption amount V and the pump driving frequency N can be represented by the graph II created based on the experimental data. Therefore, when the diaphragms 46 and 47 of the diaphragm pump 12 are not damaged, there is no air leakage, and therefore the graph II has a slope b.

However, when the diaphragms 46 and 47 of the diaphragm pump 12 are damaged and air leakage occurs, the cumulative air consumption amount V with respect to the number of times N the pump is driven decreases, and therefore the slope b of the graph II is shown. Getting smaller B
Change to the area side. Therefore, the diaphragm 4 by comparing the above S24,25, the graph II of inclination b the reference value b _o (gradient measured in the absence of air bubbles)
6, 47 can judge the presence or absence of damage. That is, when b = b _o , it is determined that the diaphragms 46 and 47 are not damaged, and when b <b _o , the diaphragm 4 is not damaged.
It can be determined that 6,6 are damaged.

As described above, the integrated flow rate Q with respect to the number N of times of driving the pump increases, so that the diaphragm pump 12
Since the damage of the diaphragms 46, 47 is reliably and early detected and notified, the operator can immediately perform the repair work on the diaphragm pump 12.

FIG. 17 is a block diagram showing a modification of the third embodiment. In FIG. 17, the same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. Reference numeral 83 is a flow meter for measuring the flow rate from the oil liquid sent through the liquid sending conduit 11.
The control device 28, instead of looking at the change in the integrated flow rate Q or the integrated air consumption amount V with respect to the pump driving number N,
The flow rate measurement value of the flow meter 83 provided in the liquid supply conduit 11 per predetermined time is read. The presence or absence of breakage of the diaphragms 46 and 47 can be detected by monitoring the presence or absence of a change in the measured value of the flow meter (the amount of oil liquid fed) with respect to the number of times N the pump is driven.

FIG. 18 is a block diagram of the fourth embodiment of the present invention. In FIG. 18, the same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. 84 is the exhaust pipe line 17
This is an oil vapor concentration sensor that detects vapor (oil vapor) contained in the air exhausted from the. The oil vapor concentration sensor 84 is composed of a semiconductor gas sensor and outputs a signal of a level corresponding to the concentration of vapor mixed in the air exhausted from the diaphragm pump 12.

Therefore, the presence or absence of vapor can be determined by comparing the level of the signal output from the oil vapor concentration sensor 84 with a reference value (oil vapor concentration measured in the absence of vapor). When the diaphragms 46, 47 are damaged, the compressed air mixes with the oil liquid and a part of the oil liquid flows into the diaphragm chambers 51, 52, so that the vapor exhausted from the diaphragm pump 12 contains vapor. Contained. That is, if the level of the signal output from the oil vapor concentration sensor 84 is equal to or higher than the reference value, the diaphragm 4
It can be determined that 6, and 47 are damaged.

Next, the processing executed by the CPU 29 of the control device 28 will be described with reference to the flowchart of FIG. Since S31 and S32 are the same processes as S21 and 22, the description thereof is omitted. In S33, the oil vapor concentration sensor 8
Read the output from 4.

In next step S34, the oil vapor concentration H detected by the oil vapor concentration sensor 84 is compared with the reference value H _O. In the next S35, when the comparison result of both is H≈H _O, it is determined that no bubbles are mixed in the oil liquid discharged from the diaphragm pump 12, and the process proceeds to S36.

In S36, it is determined whether or not all the nozzle switches 32 provided on the nozzle hook 7 of each weighing machine 3 are turned on. That is, when all the fueling nozzles 6 of each weighing machine 3 are not returned to the nozzle hook 7,
Since refueling is being performed by any one of the plurality of refueling nozzles 6, the process returns to S33 and the processes of S33 to S36 are repeated. However, when all of the oil supply nozzles 6 of each weighing machine 3 are returned to the nozzle hook 7, the process proceeds to S37, and the air supply pipeline 1
The on-off valve 21 arranged at 6 is closed to stop the diaphragm pump 12.

However, in S35, H>
When it is H _O, it is judged that vapor is mixed in the air exhausted from the diaphragm pump 12 and S38
Proceed to. Then, in S38, a message such as "the diaphragm of the diaphragm pump is damaged" is displayed on the display unit 30 and an alarm is issued from the alarm unit 31 to notify the operator that an abnormality has occurred in the diaphragm pump 12.

As described above, the fact that the diaphragms 46 and 47 of the diaphragm pump 12 have been damaged is reliably and easily detected and notified based on the oil vapor concentration H detected by the oil vapor concentration sensor 84. The repair work of the diaphragm pump 12 can be immediately performed.

[0096]

As described above, according to the first aspect, it is possible to detect whether or not the diaphragm of the diaphragm pump has been damaged. Therefore, if the diaphragm is damaged, replacement work can be performed immediately. Thereby, the operator can recognize that the diaphragm of the diaphragm pump is damaged and air is mixed in the oil liquid, and can immediately perform repair work. Therefore, it is possible to prevent refueling work without knowing that the diaphragm is damaged, and the oil liquid containing bubbles is discharged from the refueling nozzle and the measured value of the flow meter and the actual refueled flow rate are It is possible to solve the problem that they do not match.

According to the second aspect of the present invention, the compressed air for driving is damaged by the diaphragm of the diaphragm pump by detecting the density of the oil liquid flowing through the liquid feed pipe connected to the discharge port of the diaphragm pump by the ultrasonic sensor. It is possible to reliably and safely detect the outflow from the portion into the oil liquid, and to notify that the diaphragm is damaged.

According to the third aspect, by detecting the permeability of the oil liquid flowing through the liquid feed line connected to the discharge port of the diaphragm pump, the compressed air for driving is supplied with oil from the damaged portion of the diaphragm of the diaphragm pump. It is possible to reliably and safely detect the fact that it is flowing into the liquid, and to notify that the diaphragm has been damaged.

According to the fourth aspect, it is possible to detect that the diaphragm of the diaphragm pump is damaged from the difference between the amount of air supplied to the diaphragm pump and the amount of exhaust gas exhausted from the diaphragm pump. It is possible to reliably and early detect that compressed air is flowing into the oil liquid from the diaphragm-damaged portion of the diaphragm pump, and notify that the diaphragm has been damaged.

According to the present invention, the damage of the diaphragm can be detected based on the change of the integrated flow rate of the oil liquid with respect to the number of reciprocating movements of the diaphragm, so that the oil liquid flows out from the damaged portion of the diaphragm of the diaphragm pump. This can be detected reliably and early to notify that the diaphragm is damaged.

According to the sixth aspect, it is possible to detect that the diaphragm is damaged based on the change in the cumulative flow rate of air with respect to the number of reciprocating movements of the diaphragm. Therefore, it is possible to confirm that the air is flowing out from the diaphragm damaged part of the diaphragm pump. It is possible to reliably and early detect and notify that the diaphragm is damaged.

According to the present invention, the concentration of oil vapor in the air exhausted from the diaphragm pump can be measured to detect that the oil liquid is mixed in the exhaust gas. Therefore, the oil liquid is collected from the damaged portion of the diaphragm of the diaphragm pump. It is possible to reliably and easily detect the outflow and notify that the diaphragm is damaged.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a schematic configuration of a first embodiment of an oil supply apparatus according to the present invention.

FIG. 2 is a block diagram showing an attached state of the bubble detection sensor of the first embodiment.

FIG. 3 is a block diagram showing a connection state of each device of the first embodiment.

FIG. 4 is a vertical cross-sectional view of a diaphragm pump.

5 is a vertical cross-sectional view of the automatic air valve of the diaphragm pump taken along the line AA in FIG.

FIG. 6 is a cross-sectional view showing the structure of a rod bearing and an automatic air valve.

FIG. 7 is a process diagram for explaining the operation of the diaphragm pump following FIG.

FIG. 8 is a process diagram for explaining the operation of the diaphragm pump following FIG. 7.

FIG. 9 is a process diagram for explaining the operation of the diaphragm pump following FIG. 8.

FIG. 10 is a flowchart illustrating a process executed by a CPU.

FIG. 11 is a block diagram of a second embodiment of the present invention.

FIG. 12 is a flowchart illustrating a process executed by a CPU of the second embodiment.

FIG. 13 is a configuration diagram of a third embodiment of the present invention.

FIG. 14 is a flowchart illustrating a process executed by a CPU of the third embodiment.

FIG. 15 is a graph showing a correlation between an integrated flow rate Q per predetermined time and a pump driving frequency N.

FIG. 16 is a graph showing a correlation between an integrated air consumption amount V per predetermined time and a pump driving frequency N.

FIG. 17 is a configuration diagram showing a modification of the third embodiment.

FIG. 18 is a configuration diagram of a fourth embodiment of the present invention.

FIG. 19 is a flowchart illustrating a process executed by the CPU of the fourth embodiment.

[Explanation of symbols]

 1 Refueling Device 2 Underground Tank 3 Metering Machine 4 Refueling Pipeline 5 Refueling Hose 6 Refueling Nozzle 7 Nozzle 8 Flowmeter 11 Liquid Delivery Pipeline 12 Diaphragm Pump 16 Air Supply Pipeline 17 Exhaust Pipeline 20 Compressor 21 Open / Close Valve 22 Control Valve 25 air bubble detection sensor unit 27 phase comparator 28 control device 29 CPU 30 indicator 31 alarm device 37 first pump chamber 38 second pump chamber 39 automatic air valve 46 first diaphragm 47 second diaphragm 50 first diaphragm Diaphragm chamber 51 Second diaphragm chamber 64 Cylinder 65 Piston 75 Optical sensor unit 81, 82, 83 Flow meter 84 Oil vapor concentration sensor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norito Maeno 1-3-12 Nishishinbashi, Minato-ku, Tokyo Within Nippon Oil & Oil Co., Ltd. (72) Inventor Koji Yokoyama 1-6 Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa No. 3 Tokico Co., Ltd. (72) Inventor Kenji Tokuda 1-6-3 Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Tokiko Co., Ltd. (72) Atsushi Asai 1-6 Fujimi, Kawasaki-ku, Kanagawa Prefecture No. 3 Tokico Corporation

Claims (7)

[Claims] 1. An oil supply device for providing an air-driven diaphragm pump in a tank in which oil liquid is stored, and for driving the diaphragm pump to send the oil liquid in the tank to a measuring machine. A refueling device, characterized in that it is provided with a detection means for detecting whether or not the oil is damaged. 2. The oil supply device according to claim 1, wherein the detection means is an ultrasonic sensor for detecting the density of the oil liquid flowing through the liquid supply pipe line connected to the discharge port of the diaphragm pump. 3. The detection means comprises an optical sensor for detecting the permeability of an oil liquid flowing through a liquid supply line connected to a discharge port of the diaphragm pump.
Refueling equipment. 4. The detecting means detects whether or not the diaphragm of the diaphragm pump is damaged from a difference between an air supply amount supplied to the diaphragm pump and an exhaust amount exhausted from the diaphragm pump. The refueling device according to claim 1, which is characterized in that. 5. The oil supply device according to claim 1, wherein the detection means detects whether or not the diaphragm is broken based on a change in an integrated flow rate of the oil liquid with respect to the number of reciprocating movements of the diaphragm. 6. The oil supply apparatus according to claim 1, wherein the detection means detects whether or not the diaphragm is damaged based on a change in an integrated flow rate of air with respect to the number of reciprocating movements of the diaphragm. 7. The detection means measures the oil vapor concentration in the air exhausted from the diaphragm pump to detect whether an oil liquid is mixed in the exhaust gas. Refueling device.