JPH0369442A - Oil feeder with residual oil recovery device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of the trouble of feeding wrong kind of oil by mistake by providing bypasses for communication between the upstream and downstream side of a manual operating and closing valve for a nozzle, a check valve for allowing only a flow from the downstream to upstream side and a residual oil recovery device made operative by a pump pressure. CONSTITUTION:There are provided a cylinder composed of a small diameter recovery chamber 16 in communication with as downstream passage of a flow amount meter and a large diameter pressure receiving chamber 17 in communica tion with an upstream passage thereof, a piston 23 slidably movable in liquid tight state in each chamber, a residual oil recovery device 15 having a means for urging the piston 23 toward the pressure receiving chamber 17, bypasses 55 and 57 provided around a manual opening and closing valve 41 for a nozzle 14 and a check valve 54 provided on the bypasses 55 and 57 for allowing only a flow from the downstream to the upstream side of the valve 41. Therefore, the residual oil is recovered from a discharge pipe 36 through the bypass so as to be discharged. This method prevents the trouble of feeding wrong kind of oil by mistake.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a refueling device used at a refueling station or the like to supply fuel oil such as gasoline or diesel oil to automobiles.

(b) Conventional technology and its problems A refueling nozzle is connected to the downstream end of the refueling device, and by operating a manual on-off valve installed inside the refueling nozzle, the amount of refueling specified by the customer can be refilled or the amount can be refilled. It is being done.

At the end of these refueling operations, the remaining oil in the discharge pipe of the nozzle should be completely drained, but the work is often done in a hurry and oil is left behind, and if oil remains, it is difficult to start the next refueling. Sometimes the following inconveniences occur.

■If you point the tip of the cylinder downwards when trying to refuel a car, residual oil will be discharged, staining the car, or being sprayed, causing fire, pollution, and even accidents.

■Mechanism to detect the type of oil on the car side (contamination proof)
In the case of a device equipped with a nozzle, the oil discharged from the nozzle may be determined to be oil from the automobile, and the type of oil may be incorrectly determined.

If you mistakenly refuel with the wrong type of oil, it can cause engine trouble and require a large amount of money to repair and dispose of the oil.

Therefore, a method of suppressing the discharge of residual oil by installing a valve at the downstream end of the discharge pipe that opens when pump pressure is applied has been adopted, but in this case, the valve part becomes large and it is difficult to set the oil supply, which impairs work efficiency. Problems such as being lost are occurring.

(C) Structure and operation for solving the problem The present invention attempts to solve the above problem by not discharging even if there is residual oil from the previous refueling until the pump is started. consists of a pump that pumps out oil, a flow meter that measures the pumped oil, a nozzle that is connected to the downstream end of the flow path and has a manual on/off valve, and a discharge pipe at the tip, and a nozzle with the discharge pipe facing upward. A device comprising a nozzle case housed in a position facing the flowmeter, and a control means for driving the pump when no nozzle is present in the nozzle case and stopping the pump when the nozzle is present, which is connected to a flow path downstream of the flowmeter. A cylinder in which a small-diameter recovery chamber and a large-diameter pressure receiving chamber connected to the upstream flow path of the flowmeter are formed, one piston that slides in each chamber in a liquid-tight state, and this piston is connected to the pressure receiving chamber. a residual oil recovery device comprising a means for biasing the manual on-off valve in the direction of the nozzle; a bypass passage that bypasses the manual on-off valve of the nozzle; When the nozzle is returned to the nozzle case, the pump pressure disappears and the recovery chamber is enlarged, allowing the remaining oil on the discharge pipe side to be recovered in the nozzle via the bypass path. If the manual on-off valve is opened the next time the pump is started, the pump pressure will reduce the size of the recovery chamber and discharge the recovered residual oil.

(D) Embodiment In FIG. 1, reference numeral 1 denotes a pump which is driven by a motor 2 and pumps out oil from a tank (not shown) through a suction pipe 3.

4 is a filter device, which houses a filter medium and has an expanded flow path to slow down the flow of oil, and the air bubbles contained in the oil passing through this are It is led together with the gas through the capillary tube 5 to the gas separator 6.

Gas and oil are completely separated in the gas separator 6, and the gas is discharged to the atmosphere through the atmosphere discharge pipe 7, and the oil is discharged to the return pipe 9 by raising the float 8 when the oil level rises to a certain level. Since the inlet is opened, the water is collected by the suction force of the pump 1.

The bubble-free oil sent out from the filter device 4 passes through the check valve 10 and then passes through the flow meter 11. Connecting pipe 12. The water flows through the hose 13 and is discharged from the nozzle 14.

Reference numeral 15 denotes a residual oil recovery device, which includes a small diameter portion 20 and a pressure receiving chamber 17 that slide into sliding contact with the inner wall 19 of the recovery chamber 16 in a cylinder 18 consisting of a small diameter recovery chamber 16 and a large diameter pressure receiving chamber 17 that share the same central axis j. A piston 23 is installed, which has a large diameter portion 22 in sliding contact with the peripheral wall 21 of the pipe 2, and is always urged in the direction of the pressure receiving chamber 17 by the action of a spring 65.
4 to the connecting pipe 12, and the pressure receiving chamber 17 to the oil pipe line connecting the check valve 10 and the filter device 4 via the pressure receiving pipe 25.
The atmospheric chambers 26 between the recovery chamber 16 and the pressure receiving chamber 17 formed by the piston 23 are connected to the gas phase portion in the gas separator 6 via atmospheric pipes 27, respectively.

Here, the atmospheric chamber 26 is connected to the gas separator 6 by a sealing O-ring 28.2 provided on the piston 23.
This is a device that allows oil to be collected without leaking to the outside even if either of the parts 9 is damaged and oil flows in.

The pressure receiving area of the large diameter portion 22 of the piston 23 is the same as that of the small diameter portion 20.
is larger than the pressure-receiving area of , and is set so that even if pump pressure acts on both pressure-receiving surfaces, it can be moved toward the recovery chamber 16 against the bias of the spring 65 .

30 is a bypass path that bypasses the check valve 10;
A relief valve 31 is provided to release the pressure to the upstream side when the pressure on the downstream side increases.

A pulse transmitter 32 outputs a number of channel pulse signals a corresponding to the amount of oil measured by the flow meter 11.

33 is a nozzle detection switch that outputs a nozzle detection signal. When the nozzle 14 is locked in the nozzle case 34, the output signal is L (low), and when it is disconnected, it is H (high). ) state.

Reference numeral 35 denotes an oil type sensor shown in Japanese Patent Laid-Open No. 64-58697, which detects the gas sucked in through the intake pipe 37 opened at the discharge pipe 36 of the nozzle 14, and outputs a detection signal C.

38 is a display that displays the amount of oil to be supplied, etc., 39 is a control unit that houses an electric circuit that will be described later, 40 is a check valve installed in the suction pipe 3, and 61 is a phototransistor as seen in the Tokuko Sho 6m-9195. This is a type of fuel filler sensor that detects changes in external light using

In FIG. 2, reference numeral 41 is a manual opening/closing valve, and when the lever 42 is rotated counterclockwise in the figure around the support shaft 43, the valve shaft 44
is displaced upward against the bias of the spring 45 and opened.

Reference numeral 46 denotes a negative pressure generating valve, which is biased by a spring 47 in a direction against the flow of oil, and is displaced in the downstream direction by hydraulic pressure, and the negative pressure pipe 49 is caused by the oil flowing through the narrowed portion 48 created at this time. Negative pressure is generated.

Reference numeral 50 is an automatic valve closing mechanism, in which the negative pressure generated in the negative pressure pipe 49 is canceled by the air sucked in from the air suction pipe 5I opened at the tip of the discharge pipe 36, but the rise of oil and bubbles prevents the air from being sucked in. When this becomes impossible, the negative pressure value in the diaphragm chamber 51 connected to the negative pressure pipe 49 increases, the diaphragm 52 is displaced upward against the bias of the spring 53, and the manual on-off valve 41 is automatically closed.

The principle of generating this negative pressure and the operation of automatic valve closing are well known and will not be described in detail.

Reference numeral 54 denotes a check valve, which is installed in a bypass passage 55 that connects the upstream side of the manual on-off valve 41 and the immediate downstream side thereof, and allows flow only from the downstream side to the upstream side.

A check valve 56 is installed in a bypass passage 57 that connects the upstream side of the manual on-off valve 41 and the immediate downstream side of the negative pressure generating valve 46, and allows flow only from the downstream side to the upstream side.

Here, a nozzle equipped with a negative pressure generation valve 46 does not require a bypass passage 55, and a nozzle without a negative pressure generation valve 46, that is, a nozzle without an automatic valve closing mechanism 50, does not require a bypass passage 57. becomes.

In Fig. 3, 60 is a counting circuit which is returned to zero when the nozzle detection signal changes from the L state to the H state, counts the number of flow rate pulse signals a, and outputs the counted value as the oil supply amount signal d. The amount of refueling is displayed on the display 38.

Reference numeral 62 denotes an oil type determination circuit, which determines whether or not the oil type is the same as that of the relevant oil supply device based on the value of the detection signal C, and outputs a refueling permission signal e (one pulse) when it is determined that the oil type is the same. .

Reference numeral 63 denotes a refueling port determination circuit which continues to output a refueling permission signal while determining that the discharge pipe 36 is set to the refueling position based on the output state of the detection signal r output from the refueling port sensor 61.

64 is a motor control circuit, which outputs an energizing signal i to energize the motor 3 when the refueling permission signals e and h are manually input on the condition that the nozzle detection signal is in the H state, and the nozzle detection signal is in the H state. When the output of the energizing signal i changes to the L state, the output of the energizing signal i is stopped and the motor 2 is deenergized.

Based on the above configuration, the operation during refueling work will be described below.

When on standby for refueling, the nozzle 14 is not hooked to the nozzle case 34 with the discharge pipe 36 facing upward.

In this state, the nozzle detection signal outputted from the nozzle detection switch 33 is in the L state, and the motor 2 is in the de-energized state. That is, since the pump l is stopped, the piston 23 is moved into the pressure receiving chamber 1 by the bias of the spring 65.
It is in the state shown in FIG. 1 in which it has been largely displaced in the direction of 7.

When the nozzle 14 is first removed from the nozzle case 34 at the start of refueling work, the nozzle detection signal changes from the L state to the H state, and in response to this, the count value of the counting circuit 60 from the previous refueling is reset to zero.

Next, the discharge pipe 36 of the nozzle 14 is set to a refueling station of an automobile (not shown), and the manual on-off valve 41 is kept open. At this time, the pump 1 is not being driven, so even if the manual on-off valve 41 is opened, the negative pressure generating valve 46 is closed and no oil flows out from the discharge pipe 36.

Then, by setting it to the fuel filler port, the fuel filler sensor 61
outputs a detection signal f, and in response to this, the fuel filler determination circuit 6
3 outputs a refueling permission signal.

On the other hand, the oil type sensor 35 outputs a refueling permission signal e when the oil type sensor 35 determines that the components of the gas sucked through the intake pipe 37 match the oil type of the oil supply device.

Then, the motor control circuit 64 outputs the energizing signal i since the nozzle detection signal S is in the H state and the refueling permission signals e and h are simultaneously present, and the motor 2, that is, the pump l, is rotationally driven to start refueling. do.

At this time, the pump pressure acts on the pressure receiving chamber 17, displacing the piston 23 against the bias of the spring 65, and
6 is pushed out to the connecting pipe 12 via the recovery pipe 24.

The pushed out oil mixes with the oil sent from the flow meter 11 and is discharged from the nozzle 14.

As refueling progresses, the amount of oil supplied is displayed on the display 38.
When the oil supply amount desired by the customer is reached, the operator closes the manual on-off valve 14 to finish the oil supply. At this time, even if oil remains in the discharge pipe 36, the nozzle 14
When the pump is returned to the nozzle case 34, the pump stops, the pump pressure disappears, and as a result, the piston 23 is displaced in the direction of expanding the volume of the collection chamber 16 by the action of the spring 65, creating negative pressure inside the hose 13. Then, the oil remaining in the flow path 66 immediately downstream of the negative pressure generating valve 46 of the nozzle 14 is sucked into the flow path 67 via the bypass pipe 57.

Therefore, the remaining oil in the flow path 66 is collected to the flow path 67 side, and waits in this state until the next visitor.

Note that, as in this embodiment, the downstream side of the manual on-off valve 41.

When the negative pressure generating valve 46 is provided, the bypass passage 55 is not necessary.

At the next time of refueling, the pump 1 is started as described above, thereby reducing the volume of the recovery chamber 16, that is, discharging the recovered oil.

Although the embodiments have been described above, the present invention is not limited thereto, and modifications thereof will be shown below.

■The nozzle 14 has an automatic valve closing mechanism 5 as shown in Fig. 2.
There are some with 0 and others without, and those without 0 do not have the negative pressure generating valve 46, so in that case, the bypass path 55 is used instead of the bypass path 57.

■In this embodiment, the oil type sensor 35 and the oil filler port sensor 61
is provided, and the conditions for energizing the motor 2 are that the refueling permission signals e and h are output based on the detection signals c and f of both sensors, and that the nozzle detection signal is in the H state. Only one of them may be installed, and the refueling permission signal based on the detection signal of the sensor and the H state of the nozzle detection signal may coexist as a condition.

■Without providing oil type sensor 35 or oil filler port sensor, motor 2 is simply conditioned on the change of nozzle detection signal to L state.
It may be made to energize.

In this case, oil discharge will begin immediately when the manual on-off valve of the nozzle is opened.

(e) Effects As detailed above, the upstream and downstream sides of the manual on-off valve of the nozzle are connected by a bypass path, and a check valve that only allows flow from the downstream side to the upstream side is installed, and the residual valve operated by pump pressure is installed. Since we have installed an oil recovery device, the residual oil in the discharge pipe is collected when the pump is stopped and discharged when the pump is activated. This prevents car contamination and accidents due to residual oil, and also prevents residual oil from changing the type of oil used in the car. It is also possible to effectively prevent troubles caused by incorrectly refueling with the wrong type of oil.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the oil supply device and its main parts, FIG. 2 is a diagram showing the structure of the nozzle, and FIG. 3 is a diagram showing the electric circuit in the control section as a block t7. ■... Pump 4... Filter device 6... Air separator 8... Flow) 14... Nozzle 15.
... Residual oil recovery device 16 ... Recovery chamber 17 ... Pressure receiving chamber 23 ... Piston 36 ... Discharge pipe 41 ... Manual on-off valve 46 ... Negative pressure generation valve 50 ... Automatically close Valve mechanism 54.56...Check valve 5557...Bypass path

Claims (1)

[Claims] A pump that pumps out oil, a flow meter that measures the pumped oil, a nozzle connected to the downstream end of the flow path and equipped with a manual on-off valve and a discharge pipe at the tip, and the discharge pipe of the nozzle facing upward. A device comprising a nozzle case stored in a posture, and a control means that drives the pump on the condition that the nozzle case is not present and stops the pump when the nozzle case is present. and a large-diameter pressure receiving chamber connected to the upstream flow path of the flowmeter, a piston that slides in each chamber in a liquid-tight state, and this piston is attached in the direction of the pressure receiving chamber. a residual oil recovery device having a means for controlling the manual on-off valve, a bypass path that bypasses the manual on-off valve of the nozzle, and a reverse oil recovery device installed in the bypass path that allows flow only from the downstream side of the manual on-off valve to the upstream side of the manual on-off valve. A refueling device with a residual oil recovery device equipped with a stop valve.