JP3344451B2 - Automotive oil supply system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil supply apparatus suitable for metering and selling a high-viscosity liquid such as engine oil or machine oil in a tank mounted on a vehicle.

[0002]

2. Description of the Related Art For example, in a facility that consumes a large amount of oil, such as a maintenance shop or a gas station, a required amount of oil is stored in a tank, and the oil is metered and sold as needed. . The supply of oil to such facilities is usually performed using a tank that stores oil in a vehicle and a lorry equipped with a measuring device.

[0003]

However, since engine oil has a very high viscosity compared to fuel oil such as gasoline or light oil, bubbles generated by vibration during transportation are mixed in the oil. There is a problem that measurement using a positive displacement meter includes a large error in the measured value. In order to solve such a problem, a part of the weight is measured while being stored in a container. However, there is a problem that the weighing and selling takes time. The present invention has been made in view of such a problem, and an object of the present invention is to measure the amount of oil containing air bubbles with high accuracy using a positive displacement flow meter suitable for metering and sales. It is an object of the present invention to provide an on-vehicle oil supply device capable of performing the above.

[0004]

According to the present invention, a vehicle is provided with an oil storage tank, a pump, and a positive displacement flow meter, and the oil in the oil storage tank is controlled by a pump. In the oil supply device for vehicles, which is supplied to the nozzle via a hose through
By connecting a check valve between the oil storage tank and the flow meter and connecting a pressure reducing valve in the vicinity of the nozzle, oil bubbles passing through the flow meter are compressed and reduced by the discharge pressure of the pump. I made it.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a first embodiment of the present invention. FIG. 1 shows an example in which the present invention is provided.
The weighing device 3 and the hose reel 4 are mounted.

The metering device 3 sucks the oil in the tank 2 through the check valve 10 to reduce the volume of bubbles in the oil to 1/1.
A high-pressure pump 11 capable of pumping at a pressure that can be compressed to about 0, a positive displacement flow meter 12 for measuring oil from the pump 11, a stop valve 25 provided on the discharge port side of the flow meter 12, The pump 13 drives the motor 13 and calculates a refueling amount based on a flow pulse from a flow pulse transmitter 18 of the flow meter 12, and drives and stops the motor 13 by operating a start switch 14 a of the switch box 14. A control device 16 for opening and closing the small valve 25 and a small valve 15 described later, and for driving and stopping the reel motor 21 by operating the winding switch 14b, and a display 17 for displaying the amount of refueling. I have.

The flow meter 12 has a top space 45 (FIG. 3) connected to the tank 2 by a tube 19 via a stop valve 15.

The hose 2 wound around the hose reel 4
Reference numeral 0 denotes a pressure-resistant hose capable of withstanding a pressure enough to compress bubbles contained in the oil, for example, about 10 kg / sq. 38 (FIG. 3), and the other end is connected to a refueling nozzle 22 via a pressure reducing valve 23.

FIG. 3 shows an embodiment of the flow meter 12 described above, in which a fluid flowing from an inflow port 30 is supplied to one cylinder via a rotary valve 31 and a port 35 provided in a valve seat 32. 33, the one piston 34 is moved by the pressure of the fluid, and the fluid in the other cylinder 33 'is transferred from the other port 35' to the outlet port of the rotary valve 31, the center port 36 of the valve seat 32, the crank chamber. It flows out from the outlet 38 via 37.

The reciprocating motion of the pistons 34, 34 'is transmitted to the crankshaft 40 via the connecting rods 39, 39' as rotational motion, and the fluid flowing from the inlet 30 through the rotary valve 31 attached to the crankshaft 40 is transmitted. Sequentially into the next cylinders 33, 33 ',
It is configured to cause the fluid to flow from the outlet 7 to the outlet 38.

A through hole 46 for connecting to the tube 19 is provided in a top space 45 containing the rotary valve 31. A code board 41 constituting the flow rate pulse transmitter 18 is attached to the crankshaft 40 via a drive shaft 42.

In this embodiment, the fluid that has flowed in from the inflow port 30 selectively flows into the cylinders 33 and 33 'by the rotary valve 31 and slides the pistons 34 and 34', and at a speed proportional to the flow rate. By rotating the crankshaft 40 to rotate the code board 41 constituting the flow rate pulse transmitter 18, the code detection means 43 outputs a flow rate pulse proportional to the flow rate and outputs it to the control device 16 via the cable 44. .

FIG. 4 shows an embodiment of the above-described pressure reducing valve 23, in which a valve seat 5 is provided between an inlet 50 and an outlet 51.
A valve chamber 52 is formed with a weak compression spring 5 therein.
3 accommodates a main valve 55 which is always in elastic contact with the valve seat 54.

On the valve seat side of the main valve 55, a diaphragm chamber 56 into which the liquid on the outlet side flows is formed. The surface of the diaphragm 57 facing the main valve 55 is connected to the main valve 55 via the guide member 58. The other surface is pressed by a compression spring 60 whose pressing force is adjusted by a dial 59.

In this embodiment, if the liquid is sent while the pressure on the outlet side is set to, for example, 2 kg / cm 2 by the dial 59, the liquid flowing from the inlet 50 is
The main valve 55 is pressed to be separated from the valve seat 54 and flows into the valve chamber 52. When the pressure of the inflowing fluid reaches or exceeds the pressure set by the dial 59, the diaphragm 57 moves to the spring 60 side against the elastic pressure of the spring 60, and the main valve 5
5 is elastically contacted with the valve seat 54. Thus, the pressure in the valve chamber 52 is always lower than the pressure set by the dial 59 and is discharged from the outlet 51.

Next, the operation of the device thus constructed will be described with reference to FIG.
A description will be given based on the flowchart shown in FIG.
When the start switch 14a is turned on (FIG. 5 step
B) The control device 16 closes the stop valve 25 to maintain the fluid pressure in the hose 20, turns on the pump motor 13 and turns on the tank 2
Is sent to the flow meter 12. At this stage, small valve 15
Is opened for a predetermined time, for example, about 2 seconds, and then closed, and the air accumulated in the top space 45 of the flow meter 12 is discharged to the tank 2 together with the oil by the previous lubrication (step B in FIG. 5). Then, the indicator 17 is returned to zero, and the stop valve 25 is opened to make it possible to refuel (step C in FIG. 5).
During this time, the hose 20 is pulled out from the hose reel 4, and the nozzle 22 is inserted into the oil supply tank.

Immediately after starting the pump, the flow meter 12 and the hose 2
0, the pressure of the oil in the flow path of the pressure reducing valve 23 increases. As a result, the bubbles contained in the oil are compressed to reduce the volume. This liquid flows into the nozzle 22 by opening the pressure reducing valve 23. When the pressure in the valve chamber 52 reaches or exceeds the set pressure in this way, the valve 55 closes and the nozzle 22
Since the pressure on the side is maintained at or below the set pressure, a special high-pressure seal is not required for the nozzle 22, so that a nozzle having a pressure resistance of about 2 kg / square centimeter for normal fuel oil refueling can be used.

When the nozzle 22 is opened to inject oil into the oil supply tank, the oil is discharged from the nozzle 22 while being reduced in pressure to the set pressure of the pressure reducing valve 23. Thereby, the high pressure pump 11
Accordingly, oil can be discharged at a relatively slow flow rate despite the fact that the liquid is sent at a high pressure, and the generation of useless bubbles at the time of refueling can be prevented.

On the other hand, even when the oil is relatively slowly discharged from the nozzle 2, the flow path from the pump 11 to the pressure reducing valve 23 is pressurized by the high-pressure pump 11 to about 10 kg / cm 2, so that it is included in the oil. Since the bubbles that have been compressed are crushed and flow into the pressure reducing valve 23, the volume of the oil bubbles passing through the flowmeter 12 is extremely small, and the error of the flowmeter 12 due to the bubbles is extremely small.

Since the flow pulse is output from the flow pulse transmitter 18 upon refueling (step d in FIG. 5), the controller 16 counts the flow pulses and displays the refueling amount on the display 17 (step e in FIG. 5). When a predetermined amount of refueling has been completed, the nozzle 22 is closed, the start switch 14a is turned off (Step E in FIG. 5), and the pump motor 13 is stopped (Step F in FIG. 5).

Even when the high-pressure pump 11 is stopped, the flow path from the check valve 10 to the pressure reducing valve 23 maintains the hydraulic pressure at the time of operation of the pump. To accommodate. Thus, even if the hose 22 is long and a large amount of oil is stored therein, it is possible to prevent the oil in the hose from decreasing due to the expansion of air bubbles, and to supply an accurate amount of oil at the next oil supply. be able to.

Next, when the take-up switch 14b is turned on to store the hose 20 (step a in FIG. 6), the control device 16 checks whether the start switch 14a is off, and when the start switch 14a is on, the control device 16 turns on. It waits for the start switch 14a to be turned off without executing the take operation (step b in FIG. 6). This prevents the nozzle 22 from coming off the tank by winding up the hose 20 during refueling.

On the other hand, if the start switch 14a is already off (Step B in FIG. 6), the reel motor 21 is operated (Step C in FIG. 6), and the hose 20 is turned off.
On the reel 4 and waits until the winding switch 14b is turned off (step d in FIG. 6).

When the pressure of the oil in the hose 20 decreases due to a long-time stop of the high-pressure pump 11, bubbles of the oil contained therein expand, and a part of the bubbles is reduced to the top space 45 of the flow meter 12. As described above, since the small valve 15 is opened for a certain period of time at the start of refueling (step b in FIG. 5) and discharged to the tank 2, measurement errors due to bubbles are prevented. At this time, since the stop valve 25 on the discharge side of the flow meter 12 is closed, the pressure in the hose 20 does not decrease.

In the embodiment described above, the pump 11
Is driven by a motor, but it is apparent that a similar effect can be obtained even when driven by a power from an automobile engine via a part lever.

[0026]

As described above, according to the present invention, a vehicle is equipped with an oil storage tank, a pump, and a positive displacement flow meter, and the oil in the oil storage tank is passed through the flow meter by the pump and the nozzle is connected to the nozzle through the hose. A check valve is connected between the oil storage tank and the flow meter, and a pressure reducing valve is connected near the nozzle, so that oil bubbles passing through the flow meter are discharged by the pump. In addition to compressing and reducing with pressure, measurement errors caused by the volume of bubbles can be prevented as much as possible, and even after the pump stops, the pressure is reduced to about the discharge pressure of the pump by the pressure reducing valve and the check valve. Thus, the expansion of bubbles in the flow path can be suppressed to prevent a measurement error at the time of the next refueling, and a nozzle with a small pressure resistance can be used.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of a tank truck to which the present invention is applied.

FIG. 2 is a configuration diagram showing one embodiment of the present invention.

FIG. 3 is a sectional view showing one embodiment of a flow meter.

FIG. 4 is a sectional view showing an embodiment of a pressure reducing valve.

FIG. 5 is a flowchart showing a refueling operation of the same device.

FIG. 6 is a flowchart showing a hose winding operation of the same device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle 2 Tank 3 Measuring device 4 Hose reel 10 Check valve 11 High pressure pump 12 Flow meter 14 Switch box 14a Start switch 14b Winding switch 15 Small valve 16 Control device 17 Indicator 20 Hose 22 Nozzle 23 Pressure reducing valve 25 Stop valve

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-99392 (JP, A) JP-A-59-93595 (JP, A) JP-A-3-162300 (JP, A) JP-A-2- 152700 (JP, A) JP-A-56-48996 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B67D 5/04

Claims (4)

(57) [Claims] 1. An on-vehicle oil supply device which mounts an oil storage tank, a pump, and a positive displacement flowmeter on a vehicle, and supplies oil from the oil storage tank to a nozzle via a hose via a flowmeter via a pump, An on-vehicle oil supply device comprising a check valve connected between the oil storage tank and the flow meter, and a pressure reducing valve connected near the nozzle. 2. The hose is connected to the flow meter through a stop valve, and a top space of the flow meter is connected to the oil storage tank through a small valve, and the small valve is closed before refueling is started. The on-vehicle oil supply device according to claim 1, wherein the small valve is opened for a predetermined time to discharge bubbles to the oil storage tank, and then the stop valve is opened. 3. The on-vehicle oil supply device according to claim 1, wherein the hose is wound around a hose reel driven by a motor, and the motor becomes operable when the refueling operation is completed. 4. The on-vehicle oil supply device according to claim 1, wherein the pump has a discharge pressure of about 10 kg / square centimeter, and the pressure reducing valve has a discharge pressure of about 2 kg / square centimeter.