JPH0272095A - Safety device for oil feeding apparatus - Google Patents

Abstract

PURPOSE:To prevent oil from being blown out with a built-in valve left open at the start of the next feeding by providing an air releasing valve to open an air pipe to the outside in conjunction with changes in the position of a hooking means holding a nozzle with built-in valve left open. CONSTITUTION:Unless the lever 29 of a nozzle 7 is placed back in a predetermined position after a pump motor 2 is deenergized by a preset feeding, the depressing of an air supply means 14 causes air to escape to the outside through an air releasing hole 35 and the reduced-diameter portion 36 of a valve shaft 23 instead of being sent to a pressure sensor 12 and, therefore, a pressure detection signal (b) is not generated. As a result, the feeding operation will not move on to the next process, i.e., the nozzle 7 is not raised to a feed standby position. An operator, aware of this, should put the lever back in place to cut off the communication between the valve chamber 22 of a valve body 24 and an outflow passageway 37 and then depress the air supply means 14 again.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an apparatus used at a gas station or the like to supply gasoline, diesel oil, and fuel oil to automobiles.

(Ron) Prior Art In recent years, there has been an increase in the number of oil supply devices equipped with preset functions and stop functions.

With these devices, when the refueling operation progresses and the refueling amount reaches a preset value or the exact value, the valve on the main body side is automatically closed and the pump motor is de-energized to end the refueling process, so it is safe to do so. Therefore, it is necessary to remember to close the built-in valve of the nozzle that remains open after refueling.

Therefore, the present applicant previously proposed a nozzle/I/all in which a built-in valve is closed by turning the tip of the nozzle upward, as shown in Japanese Patent Publication No. 60-24039.

(c) Problems to be solved by the invention In order to point the tip of the nozzle upward so that it is above the built-in valve, the entire grip must be made quite heavy, or a spring must be used to force the tip of the nozzle upward at all times. There is no choice but to install all the parts, and it will be difficult to refuel in this case.If you do not use the above method, you will have to consciously direct the tip of the cylinder upwards.If you neglect this, the built-in valve will close and there will be no 2"L. There is.

2) To solve all the problems, the current refueling work cannot be completed unless the built-in valve of the nozzle is closed. A pump that pumps out, a flowmeter that measures all the oil pumped out, a flowmeter connected to the downstream end of the flowmeter, a built-in nozzle that opens and closes by manual operation, and a flowmeter located near the nozzle. In a refueling device consisting of an air supply device and a specific pressure sensor connected to the air supply device via an air pipe, the built-in valve of the nozzle μ is opened.
It is equipped with an atmosphere release valve that opens the air pipe to the atmosphere in conjunction with the displacement position of the locking tool that is locked in the A state.

(E) If the built-in valve of the working nozzle is left open, the atmosphere release valve is open, and even if you try to operate the air supply device to send air to the pressure sensor, the air will escape from the atmosphere release valve and reach the pressure sensor. No operation signal is sent from the pressure sensor.

(f) Example In Fig. 1, (1) is a pump and a pump motor (2).
), pumps up oil from an underground tank (not shown) through a suction pipe (3) and sends it to a flow meter (4).

The NFC oil measured by the flow meter (4) is sent to the hose lifting unit (6) through seven oil feed pipes (5).

Inside the hose lifting unit (6) is a hose reel (9) for winding a hose (8) with a nozzle (7) connected to its tip, and a hose reel motor αG for driving the hose reel in forward and reverse directions. From the rotation of the hose (9), the length of the hose (8), that is, the nozzle /L/(
7) Nozzle position detector that detects all heights from the ground 0υ
and a pressure sensor@, which will be described later, are housed therein.

Q3 is an air pipe, one end goes to the pressure sensor α4, and the other end uses a rubber bag or piston system near the nozzle/v(7). It is connected to the air supply device α, which has a structure for sending out air, and from a branch point OG on the way, it is also connected to the atmosphere release valve of the nozzle/v (7), which will be described later.

0Q is a flow rate pulse transmitter that outputs one flow rate parnu signal a every time the flowmeter measures a unit oil amount (1/100 liter), (17) is an fL friend oil supply amount indicator installed in an open area,
(G) is a presetting gearboard, and α1 is a constant control unit that houses four electrical circuits to be described later.

In Figures 2A and 2B, the nozzle /L/(7) is the hose (
8) is connected to the lower end of the rotary pipe joint (1) as shown in the figure so that it can rotate in the vertical plane and in the horizontal plane.

Cυ is the main body, in which is formed a valve chamber (A) through which the inflow from the hose (8) is guided, and a valve shaft extending in the longitudinal direction of the main body Cυ. n9 valve body (built-in valve)■, the direction that always closes the valve body h' (left side in the figure) Spring 4, which biases the valve shaft (C), and the support shaft (1) swing around the entire center. The lever that can be moved dynamically and extends through the cutout hole of the square shaft and the sliding hole (c) formed below the main body Qυ in the vertical plane as shown in the figure. It is movable and the lever is fixed.The left end has a cylinder tip.
is connected.

In addition, on the right side of the main body &1), an atmosphere release hole (to) is bored at a position intersecting the sliding hole through which the valve stem (c) is displaced.An air pipe α] is connected to one end of the hole. The other end is open to the atmosphere at the sliding point.

On the other hand, a small diameter portion (7) is formed in the valve stem (C), and the valve body (C) releases the blockage between the valve chamber □□□ and the outflow path (B) leading to the tip (to). The atmosphere release hole (7) communicates with the atmosphere release hole (7) through the small diameter part (G) only when the valve stem is open. It is fully configured.

In Fig. 5, 1 is a switch, and 1 is a diaphragm that is constantly biased by a spring and is divided into a sensor chamber 11 - a pressurized chamber and an atmospheric pressure chamber. ing.

The actuator is fixed to the diaphragm (A) and when the diaphragm (G) bends against the bias of the spring (T), the switch (T) is pressed to check the pressure, but a high force is applied. 1゜←In the hose reel motor control circuit, the pressure detection signal is input when the nozzle (7) is in the refueling standby position and the refueling standby position signal C is output from the nozzle position detector αυ. and the forward rotation signal ei is output high to energize the Haw reel motor 011 to rotate forward. Note that this normal rotation bias is caused by the nozzle (7) descending to the refueling position and detecting the nozzle position detector α.
This continues until the refueling position signal d is output from υ.

On the other hand, when the nozzle (7) is in the refueling position and the refueling position multiplier d is output from the nozzle position detector Ql), if the pressure detection signal G is input, a reverse rotation signal f is output. output and energize the hose reel motor Q (1 reverse direction.
This reverse biasing continues until the nozzle ρ(7) rises to the refueling standby position and the refueling standby position signal C is output from the nozzle position detector Oυ.

(c) is a supply fFjJ amount counting circuit, which calculates the amount of oil supplied by counting the number of flow rate pulse signals a after inputting the normal rotation signal e, whose count value returns to zero, The calculated value is outputted as a refueling value signal and the refueling amount display 28 displays the oil amount.

0υ is a comparison circuit, which compares the preset value set in advance on the keyboard (to) with the preset value that is output as n preset value l - [guise l (closed), and the count value of the inn Q counting circuit (!ri, that is, the oil supply value The value of No. 11 is compared, and both output '-16' and refueling stop fiJ No. S (one pulse).

(η is the pump motor control circuit, and the pump motor is energized while 1a and d are input at pine itE.
On the other hand, when the refueling stop signal S is input, the pump motor stops outputting the minute signal t even if the refueling position [, -r d is input. to completely stop the pump motor (2).

This drive stop continues until the pressure detection signal fFJ is input twice.

The first embodiment based on Figures 1.2A, 211, and 5 in the above 114 Ebisu? explain.

When the air supply device Q4) is suppressed at the start of refueling, the 9 qi in the air supply device A4 flows through the trachea υ and is detected by the pressure sensor (2).
reaches the pressurizing chamber 0]), and bends the diaphragm against the bias of the spring. Then, the actuator @3 presses the knob ■, so a pressure detection signal is output.

On the other hand, at this time, the nozzle (7) is in the refueling standby position and the refueling standby position signal C is output from the nozzle position detector συ, so the hose reel motor is controlled [! ! J road @
The on-road four-turn signal e is output to urge the hose reel motor QG to rotate forward until the nozzle μ (7) descends to the refueling position.

At this time, due to the generation of the normal rotation signal e, the count value in the refueling amount counting circuit returns to zero.

When the nozzle/L' (7) finishes descending to the refueling position i, a refueling position signal d is output from the nozzle position detector αυ.

Then, the pump motor (2) is energized by the generation of the pump motor energizing signal t, and the hose reel motor αO is stopped by the disappearance of the normal rotation signal e.

After that, input the desired amount (20 liters) from the preset keyboard (G), then insert the tip 03 of the nozzle (7) into the oil filler port (not shown), and fully pull the lever 4 to fully displace the valve body (C). The valve chamber (■) and the outflow passage (■) are communicated with each other.

Since the pump motor (2) is already energized at this time, refueling will begin.

As the refueling work progresses, the value of the refueling amount, that is, the value of the refueling value signal, changes to the value of the preset value signal, that is, 20 liters)/i/
When reaching , a refueling stop signal sH is output to the comparator circuit (g) to completely stop the output of the pump motor energizing signal gt.

At this point, the preset area has been refueled and the nozzle is 1v.
Since the valve body (c) of (7) is in the open state as shown in Fig. 2B, after this, the lever is returned to the position shown in Fig. 2A, and the air supply tool is opened.
4 is pressed to deflect the diaphragm (2) and output from the pressure sensor (2) to the pressure detection doublet tb'.

When the pressure detection signal is output, a reverse rotation signal f is output from the hose reel motor control circuit, and the hose reel motor αO is energized in the reverse direction, and the nozzle /'l/(7) moves from the refueling position to standby for refueling. It will rise to the hour position and wait for the next visitor.

However, with preset lubrication, Bondemo p
- (After the 21 nozzles are deenergized, the air that should be sent to the pressure sensor (a) even if the air supply device α is suppressed is not returned to the position shown in Figure 2A unless the lever in (7) is returned to the position shown in Figure 2A. escapes into the atmosphere through the atmosphere opening hole (G) and the small diameter part of the valve stem (A), and does not reach the pressure sensor @, so the pressure detection signal is not output. /I/(7)
does not rise to the refueling standby position.

When the operator noticed this, he returned the lever fully, cut off the communication between the valve chamber (A) and the outflow passage (B) through the valve body (C), and pressed the air supply tool q4 again.'' good.

In the first embodiment described above, the atmosphere release valve (B) is opened and closed by the movement of the position of the valve body (C) itself, but the atmosphere release valve [Yes] is then opened and closed by the position of the lever). A second embodiment showing the configuration? 3rd A. I will explain based on 3BIE money.

For parts with the same functions as those in the first embodiment, the same seconds and names will be used, and redundant explanation will be omitted.

The trowel is a valve stem with a valve body Gυ fixed to the right end, and is placed parallel to the valve stem (A), with the left end close to or facing the lever handle, and the valve stem slope is inserted by the spring force.
In other words, the valve body Gυ is biased in the direction of protruding toward the air opening (2), bypassing the sliding hole (2) and closing the extended atmosphere opening (2).

That is, in the second embodiment, the atmosphere release hole (7), the valve stem (2), and the valve body 6υ constitute the atmosphere release valve (m).

Therefore, when the valve body 34 is in the non-lubricating position as shown in Fig. 3A, the lever handle is pushed against the valve stem (to) and displaced to the position shown, so that the valve body Gp completely closes the atmosphere opening hole (to). Therefore, even if the air supply device α is suppressed, air will not escape from the atmosphere opening hole and will be reliably transmitted to the pressure sensor.

However, as shown in Figure 3B, when the valve body (C) is in a position that allows full refueling, the lever handles are displaced one length clockwise as shown in the figure, and the valve body 6υ opens the atmosphere opening hole (7) to the atmosphere. If the pressure sensor (2) is in the open position, air will escape from here and the air supply to the pressure sensor (2) will be obstructed.

Next, based on Figures 4A and 4B, we will show an embodiment of JG3 in which the atmosphere release valve is opened and closed depending on the displacement position of the locking piece Gυ that locks the lever in the refueling allowable position. Explain.

Rotation up to a certain angle around the support shaft is allowed.A valve body made of a rubber plate is installed on the right end of the locking piece 0υ. When the l2fJt is not engaged, the lower end of the opening (opening to the atmosphere) that bypasses the sliding hole 01 and is extended is closed.

That is, in the third embodiment, the atmosphere release hole (to), the locking piece C(I), and the valve body constitute an atmosphere release valve @.

Therefore, as shown in Fig. 4A, if the valve body is blocking the atmosphere release hole (end), air may not escape from the atmosphere release hole (end) when the air supply tool α (lt) is pressed. Therefore, the pressure is reliably transmitted to the pressure sensor @, but when the locking piece 0η locks the lever (G) as shown in Figure 4B, the valve body opens the atmosphere release hole 05, so the air supply device aψ is Even if a suppression operation is performed, air escapes through the atmosphere release hole (7) and the pressure sensor @ does not produce an output.

Although the valve body (to) is closed only by the weight of the locking piece 0υ, the locking piece 0υ may be biased clockwise in the figure by a spring.

In the explanation of each of the above embodiments, the air supply device α4) is one that sends out the air stored in its internal space by pressing operation, and the air supply device α4) is not limited to the rubber bag type or piston type, but may be of other types. In addition to the diaslam type pressure sensor, strain gauge type, semiconductor type, etc. can also be used.

Furthermore, the present invention is applicable not only to a system in which the nozzle 7L/'6 is suspended from the ceiling, but also to a system in which the fuel supply system is installed on the ground together with the main body.

(g) Effects As detailed above, if the nozzle's built-in valve is in a constant open state, it will not be possible to move on to the next stroke, such as lifting the nozzle or restarting the pump, so the built-in valve will open when refueling starts next time. It is possible to reliably prevent accidents such as oil suddenly gushing out while the oil is still standing.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the arrangement of the oil supply device, Fig. 2A. Figure 2B shows the structure of the nozzle in the first embodiment, Figures 3A and 3B show the structure of the nozzle in the second embodiment, and Figures 4A and 4B show the structure of the nozzle in the third embodiment. FIG. 5 is a block diagram showing the electric circuit in the control section.

Claims (1)

[Claims] 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 meter and has a built-in valve that opens and closes when manually operated, and an air supply placed near the nozzle. and a pressure sensor connected to the air supply device via an air pipe, the oil supply device comprising an atmosphere release valve that opens the air pipe to the atmosphere when the built-in valve of the nozzle is in an open state. Safety device for refueling equipment.