JPH0764396B2 - Liquid supply device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a so-called “full tank supply” automatic liquid supply device.

(Prior Art) A liquid supply nozzle used at a gas station, etc.
As seen in JP-A-51-27885, when the air passage pipe opened at the tip of the nozzle is blocked by the liquid in the tank, the valve closing mechanism is automatically operated to stop the liquid supply. However, in reality, the air flow tube is blocked by the bubbles generated on the upper surface of the liquid and the liquid supply is stopped, so to fully fill the tank, operate the lever several times. It has a disadvantage that the valve closing mechanism must be reset each time.

(Object) The present invention has been made in view of such inconvenience, and an object of the present invention is to provide a novel liquid supply device capable of filling the tank with a single liquid supply operation. .

(Means for Achieving the Purpose) That is, the present invention is a liquid supply device for achieving the above-mentioned object, in which the liquid supply nozzle communicating with the oil supply pump on the metering device side is always blocked by the biasing member. A main valve biased in the direction of the main valve is disposed, one of the hydraulic chambers of the main valve is located upstream of the flow path through the small hole, and the other is located downstream of the flow path through the passage. While communicating, on the downstream side of the main valve,
A first valve that communicates with an air flow path pipe that opens near the tip of the nozzle and a negative pressure generating portion in the flow path and closes the passage with negative pressure generated in this pipe; and with the operation lever, closes the passage. While the main valve opening / closing mechanism having the second valve is provided, the metering device side stops the liquid supply by the signal from the liquid supply stop detecting means, and after a predetermined time by the signal from the time measuring means. A liquid supply pump that starts liquid supply while reducing the discharge amount is arranged.

(Examples) Therefore, the details of the present invention will be described below based on illustrated examples.

FIG. 1 shows an embodiment of the present invention. The nozzle body 1 is roughly divided into a grip portion 2, a body portion 3 and a cylinder tip portion 4 and is connected to the rear end of the grip portion 1. The liquid that has flowed into the nozzle body 1 from the liquid supply hose 5 is configured to flow from the opening 13 provided in the body portion 3 to the cylinder tip portion 4 via the check valve 8.

The main valve 10 provided in the body portion 3 is formed as a diaphragm type valve stretched in the hydraulic chamber 11, and the spring 12 acting on the back surface always closes the opening 13 of the flow path reaching the cylinder tip portion 4. When the hydraulic pressure in the hydraulic chamber 11 communicating with the upstream side 6 of the flow path via the small hole 14 decreases, the hydraulic pressure of the upstream side 6 resists the spring 12 and bends to information. Therefore, the opening 13 is opened.

On the other hand, the main valve opening / closing mechanism 15 provided on the downstream side of the main valve 10 described above.
Is a through hole 18, 20 that leads from the hydraulic chamber 11 to the downstream side 7 of the flow path.
It is configured as a valve mechanism that opens and closes.
Is connected to the downstream side 7 of the flow path, and when the liquid level in the tank is detected, it functions to shut off the hydraulic chamber 11 and the downstream side 7 of the flow path. The main valve opening / closing mechanism 15 includes a first liquid chamber 17 communicating with the hydraulic chamber 11 via a passage 16 and a first liquid chamber 17 via a through hole 18.
To the downstream side 7 of the flow path via the passage 20
Liquid chamber 19 of each of these through holes 18, 20 by a first valve 21 operated by an automatic valve closing mechanism 22 described later and a second valve 27 operated by an operating lever 29. It is configured to be opened and closed.

Explaining this in more detail, the automatic valve closing mechanism 22 for operating the first valve 21 checks if the air passage pipe 23 opened at the tip of the tip 4 of the nozzle body 1 is blocked by a picture in the tank. In order to close the passage 18 against the spring 25, the first valve 21 integrated with the diaphragm 24 is deformed downward by the negative pressure from the negative pressure generating portion 50 opening near the valve 8 in the drawing. The operating lever 29, which is configured to lower the valve and operates the second valve 27, pulls this around the fulcrum 30 to move the lever.
A second valve 27, which is integral with 26, is pushed up against a spring 28 to open a through hole 20 communicating with the downstream side 7 of the flow path.

Reference numeral 31 in the drawing indicates a latch that is locked at a position where the operation lever 29 is pulled.

3 and 4 show a metering device 51 and a liquid supply control device 40. The liquid supply control device 40 of the metering device 51 is a pulse signal from a flow rate pulse transmitter 34 connected to a flow meter 52. When the liquid is cut off, the liquid supply stop detection means 41 for outputting a signal to the time measurement means 42 and the motor control means 43, and the signal set from the liquid supply stop detection means 41, the pump 53 of the pump 53 after the preset time has elapsed When the signal is input from the timing means 42, the pump motor 37 is controlled so as to reduce the discharge amount every time a signal is input from the timing means 42, and the liquid is supplied when the signal is input several times. The flow rate pulse transmitter is set by the signal from the motor control means 43 and the nozzle switch 35, which is configured so as not to accept the signal after the stop.
The flow rate pulse from 34 is settled, and the counting means 44 which outputs the integrated value to the display 36 via the display driving means 45.

Next, the liquid supply operation by the above-mentioned device will be described.

As shown in FIG. 1, under the condition that the liquid supply nozzle main body 1 is hung on the nozzle hook of the measuring device 51, that is, the liquid supply pump 53 is stopped and the operation lever 29 is not operated. As described above, the main valve 10 is biased by the spring 12 used on the back surface of the main valve 10 to close the opening 13 of the flow path, and the first valve 10
21 is pulled up by the spring 25 to open the through hole 18 communicating with the second liquid chamber 19, and the second valve 27 is actuated by the spring 28 acting on itself.
The through hole 20 which is urged by the valve and communicates with the downstream side 7 of the flow path is closed.

Under this condition, for example, if the nozzle body 1 is removed from the nozzle hook to fill the fuel tank of an automobile with gasoline,
The signal from the nozzle switch 35 resets the counting means 44 to zero the display 36, and at the same time, the pump motor
37 drives the liquid supply pump 53 to start liquid supply operation.

Therefore, next pull the operating lever 29 and latch it.
When it is hung on 31, the second valve 27 pushed up by the link operating lever opens the through hole 20 as shown in FIG. 2 (a). Therefore, the hydraulic chamber 11 on the back of the main valve 10 has the passage 16, the first
Through the liquid chamber 17, the through hole 18, the second liquid chamber 19, and the through hole 20 to communicate with the downstream side 7 of the flow path to reduce the hydraulic pressure, and thereby the main valve 10
Is pushed up by the hydraulic pressure on the upstream side 6 to open the opening portion 13 to enable the liquid supply.

Then, the liquid level in the tank rises due to this liquid supply, and when the open end of the cylinder tip portion 4 is eventually closed by the bubbles formed on the liquid surface, the automatic valve closing communicating with the air passage pipe 23 is performed. The negative pressure chamber of the mechanism 22 receives negative pressure in the negative pressure generating portion 50 of the check valve 8 to become negative pressure, and this negative pressure attracts the diaphragm 24 downward against the spring 25 (see FIG. 2 ( b)), the through-hole 18 that presses down the first valve 21 integrated therewith and leads to the second liquid chamber 19.
To block. As a result, the rear hydraulic chamber 11 of the main valve 10 has a small hole.
Since the hydraulic pressure flowing from 14 becomes equal to the hydraulic pressure on the upstream side 6, the main valve 10 closes the opening 13 of the flow path by the biasing force of the spring 12 to temporarily stop the liquid supply.

In such a state, the liquid supply stop detection means 41 detects the liquid supply stop based on the output signal from the flow path pulse transmitter 34, and sets the timing means 42 by the signal,
A signal is sent to the motor control means 43 to stop the pump motor 37.

On the other hand, since the negative pressure generated in the negative pressure generating section 50 disappears due to the stop of the liquid supply, the diaphragm 24 is biased by the spring 25 acting on itself, and the original state as shown in FIG. Then, the first valve 21 which is integral therewith is pulled up to open the through hole 18 leading to the second liquid chamber 19.

Then, when a preset time, that is, a time of 2 to 3 seconds until the bubbles in the tank disappear, the time measuring means
In response to the signal from 42, the motor control means 43 restarts the pump motor at a speed that reduces the liquid supply flow rate from 50 / min to 20 / min, for example.

Therefore, the liquid fed into the upstream side 6 of the flow path by the liquid supply pump pushes up the diaphragm 10 and flows into the tank from the opening 13 through the cylinder tip portion 4 in the same manner as described above.

Then, when the liquid level in the tank further rises and the air flow tube 23 opened at the tip of the cylinder tip portion 4 is closed again by the bubbles in the tank, the same operation as above is repeated, for example, 20
By continuously supplying liquid into the tank with the flow rate reduced from / min to 5 / min, and repeating this three or four times, the motor control means 43 considers that the tank is full. The pump motor 37 is stopped without receiving a subsequent signal from the timing means 42, and all liquid supply is completed.

Then, when the operating lever 29 is finally released from the latch 31, the second valve 27 pushed up by the operating lever 29 moves to the spring 28.
Is forced to close the through hole 20 communicating with the downstream side 7 of the flow path to return to the initial state shown in FIG.

By the way, although the above description is for the embodiment configured as a full tank liquid supply device, an integer signal is output from the counting means 44 at the time of re-liquid supply after the temporary liquid supply is stopped, and the pump motor 37 is generated by this integer signal. The present invention can also be applied to a liquid supply device provided with an integer amount liquid supply stop function for stopping. Further, as means for reducing the liquid supply flow rate after the temporary liquid supply is stopped, in addition to the rotation speed control of the pump motor 37,
It can also be performed by controlling the opening degree of a valve provided in a part of the liquid supply path.

(Effect) As described above, according to the present invention, the first automatic valve that closes the passage connecting the hydraulic chamber of the main valve and the downstream side of the flow path is provided on the downstream side of the main valve that opens and closes the flow path. Since the main valve opening / closing mechanism including the second manual valve and the second manual valve is provided, the repetitive full tank liquid supply operation can be performed by the main valve opening / closing mechanism different from the main valve, and the device is Not only can it be greatly simplified and its operation can be performed more reliably, but also the liquid supply can be stopped by closing the liquid supply nozzle, and after a certain period of time, the flow rate can be reduced to supply liquid. By performing the liquid supply operation, by performing the liquid supply operation for the first time, the subsequent full tank liquid supply operation is automatically repeated, and the labor saving of the liquid supply operation of this type can be achieved to a greater extent.

[Brief description of drawings]

The drawings each show an embodiment of the present invention.
The figure is a side view of the device shown in cross section, FIGS. 2 (a) and 2 (b) are diagrams showing the operation of the same device, FIG. 3 is a diagram showing a liquid supply device, and FIG. 4 is a diagram showing a control device. Is. 1 ... Nozzle body, 10 ... Main valve 15 ... Main valve opening / closing mechanism, 16 ... Passage 21 ... First valve, 27 ... Second valve 22 ... Automatic valve closing mechanism, 29 ... Operation lever

Claims (1)

[Claims] 1. A liquid supply nozzle communicating with an oil supply pump on the side of a metering device is provided with a main valve urged by a urging member in a direction to always close a flow passage, and a hydraulic chamber of the main valve. One of them is connected to the upstream side of the flow path through a small hole, and is connected to the downstream side of the flow path through the other passage, respectively, and at the downstream side of the main valve, in the vicinity of the nozzle tip and in the flow path. A first valve that communicates with an air flow pipe that opens to the negative pressure generating portion and closes the passage by a negative pressure generated in the pipe, and a second valve that is operated by an operating lever to close the passage. While the main valve opening / closing mechanism provided with is arranged, the metering device side stops the liquid supply in response to a signal from the liquid supply stop detection means, and the discharge amount is throttled after a fixed time by a signal from the time measuring means thereafter. A liquid supply device, characterized in that the liquid supply pump for starting liquid supply is arranged.