JPS62122998A - Liquid feeder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a liquid supply device for supplying foaming liquid such as gasoline, and particularly to a liquid supply device suitable for use in automatic replenishment. Regarding equipment.

[Prior art]

Generally, when refueling a vehicle with gasoline using a gasoline supply device or the like, so-called full tank refueling is often performed, in which the fuel tank is refilled until it is full. For this reason, the refueling nozzle is equipped with a liquid level sensor, and when the liquid level sensor is activated, the automatic valve closing mechanism attached to the refueling nozzle or a signal from the liquid level sensor causes the pump and solenoid valve to stop operating. It is configured to do this.

[Problem that the invention seeks to solve]

However, since gasoline is a foaming liquid, bubbles are likely to be generated during refueling, and the liquid level sensor may be activated by the bubbles, causing refueling to be stopped before the tank is actually full. For this reason, the reality is that workers at gas stations manually refill additional fuel, which has the drawback of requiring time and effort to refuel.

The present invention was made in view of the problems of the prior art, and it is possible to determine whether the liquid sensor installed in the discharge pipe of the liquid supply nozzle truly outputs a detection signal due to liquid, or whether bubbles attached to the liquid sensor are detected. It is an object of the present invention to provide a liquid supply device which can accurately supply a full tank of liquid by confirming whether a detection signal has been outputted or not.

[Means for solving problems]

In order to solve the above problems, the present invention, as shown in the functional block diagram of FIG.
and a liquid supply nozzle 3 provided on the other side of the flow path 1 and having a discharge pipe at the tip thereof, the liquid supply nozzle 3 is provided on the discharge pipe of the liquid supply nozzle 3, and when an oil liquid is detected. The operating liquid sensor 4, the liquid level preliminary detection means 5 provided in the liquid supply nozzle 3 and detecting that the liquid level has reached nearly full, and the signal from the liquid level preliminary detection means 5, A liquid supply stop means 6 stops the liquid supply means 2 for a predetermined time tA, and after a first predetermined time period has elapsed by the liquid supply stop means 6, the liquid supply stop means 6 is operated again and the liquid sensor a liquid supply restart means 7 that stops the operation when a detection signal is input from the liquid sensor 4; and a liquid supply restart means 7 that stops the operation when a detection signal is input from the liquid sensor 4; a micro-driving means 8 that repeats micro-driving a plurality of times for a second predetermined time t; 2, and a full tank confirmation means 9 for stopping the operation of the minute drive means 8 and operating the liquid supply restart means 7 again when the detection signal disappears.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The liquid supply device according to the present invention will be described below with reference to FIGS. 2 to 11, taking a gasoline supply device as an example.

First, in FIG. 2, reference numeral 11 indicates a fixed oil supply device, and the oil supply device 11 includes a main body 12, a pipe 13 provided in the main body 12, and one end of which connects to an underground tank (not shown), and A pump 15 driven by a pump motor 14 provided in the middle of the pipe 13, a flow meter 17 equipped with a flow rate pulse transmitter 16, and a flow meter 17 provided at the other end of the pipe 13 via a hose 18, which will be described later Sensor 37, displacement sensor 58
In order to unhook the refueling nozzle 19, there is a nozzle accommodating part 20 provided on the side wall of the main body 12, and when the refueling nozzle 19 is hung in the nozzle accommodating part 20, an opening signal is output. , a nozzle switch 2 that outputs a closing signal when removed, and a refueling amount indicator 22 that displays the amount of refueling, each having a specific configuration shown in FIG. 6, each of which is connected via a signal line. It is roughly composed of a device 23.

Next, the specific structure of the oil supply nozzle 19 will be described with reference to FIGS. 3 to 5.

Reference numeral 31 designates a nozzle body whose one end side is connected to the hose 18, into which a fluid flow path 32 and pipe 33 are inserted, one end is connected to the detection hole 34, and the other end is connected to the main valve described later. A negative pressure pipe connected to the negative pressure chamber 54 of the displacement mechanism 45, and a negative pressure generating mechanism (not shown) in the middle of the negative pressure pipe 35.
It is open to

36 is a connecting member located near the detection hole 34 and has a communication hole 36A formed therein to connect the middle of the negative pressure pipe 35, and 37 is a connecting member 36 that is exposed in the communication hole 36A. A buried liquid sensor, for example, an ultrasonic sensor is used as the liquid sensor 37, and the liquid (gasoline)
The presence or absence of liquid is detected from changes in received waves when the communicating hole 36A is full and when it is not full, and a detection signal is output. Note that the liquid sensor 37 is not limited to an ultrasonic sensor, and a rechargeable sensor or the like may be used.

Reference numeral 38 indicates a valve seat provided in the middle of the flow path 32, and reference numeral 39 indicates a valve mechanism that is opened and closed by an operating lever 56, which will be described later. A valve passage 41 bored in the valve body 40, an auxiliary valve body 42 that seats and leaves the main valve body 40 to open and close the valve passage 41, and the main valve body 40 and the auxiliary valve body 42 are attached in the valve closing direction. Spring 43, 4
It is composed of 4.

Further, 45 indicates a main valve displacement mechanism that closes the main valve body 42 when the liquid level reaches a predetermined liquid level. It is slidably inserted into the nozzle body 31, and the lower end side is the nozzle body 31
A hollow shaft 47 that protrudes outward and becomes an operating end that is operated by the operating lever 56, and whose upper end side is located inside the sleeve 46, and a hollow shaft 47 that is slidably inserted into the hollow shaft 47 and when the valve is opened by the operating lever 56, will be described later. is displaced upward together with the hollow shaft 47 via the roller 50 to open the auxiliary valve body 42 and the main valve body 40 in this order, and the roller 50
When activated and displaced downward, the enlarged diameter portion 48A contacts the upper end of the hollow shaft 47 to close only the main valve body 40, and the valve body rod 48 is urged upward. a pair of rollers 50 that are inserted into the axial middle of the hollow shaft 47 and the valve rod 48 and capable of engaging with and disengaging from the valve rod 48;
The "U"-shaped receiver with the elongated hole 51A that receives the 0 so as to be movable only in the axial direction is a plate and a slotted diaphragm.
? and M2 provided on the outside of the S diaphragm 52.
A negative pressure chamber 54 formed between S and the diaphragm 52
and a compression spring 55 stretched within the negative pressure chamber 54. Here, the negative pressure chamber 54 is opened at the other end of the negative pressure pipe 35 described above.

On the other hand, 56 is an operating lever whose one end side is pivotally supported by the nozzle body 31, and when the operating lever 56 is operated, the hollow shaft 47 is pushed up and the main valve body 40 and the auxiliary valve body 42 can be opened. . In addition, when automatically refueling, the other end of the operating lever 56 is connected to the lever guard 57.
It can be hooked to a hook (not shown) provided in the.

Further, numeral 58 indicates a displacement sensor as liquid level preliminary detection means used in this embodiment, and the displacement sensor 58 detects that the main valve body 40 is closed from the operating state of the main valve displacement mechanism 45 described above. It is something.

For this reason, the displacement sensor 58 according to this embodiment has a support plate 51.
4, and a photocoupler 60 that outputs a main valve displacement signal only when the shielding plate 59 is displaced in the direction of arrow A in FIG. Note that the displacement sensor 58 is not limited to a photoelectric sensor, and may be a magnetic sensor consisting of a permanent magnet instead of the shielding plate 59 and a magnetoresistive element instead of the photocoupler 60, or an ultrasonic sensor. Good too.

Next, FIG. 6 shows a specific configuration of the control device 23 in FIG. It is composed of a display drive circuit 62 that drives each digit of , and a processing circuit 63 consisting of a microcomputer or the like. The processing circuit 63 includes a CPU 64 that performs arithmetic processing, a ROM 65 that stores programs shown in FIGS. 9 to 11, a RAM 66 that has a configuration shown in FIG. 67, a system bus 68 connecting these, and a CPU
an oscillator 69 connected to 64 and oscillating clock pulses;
The flow rate pulse generator 16 is directly connected to the CPU 64 via a waveform type circuit (not shown).

Furthermore, FIG. 7 shows a specific configuration of the storage area realized in the RAM 66, in which the pulse counter PLSCN
T, a pulse timer counter Ptm, a bubble extinguishing timer tA, a minute drive timer t, and a minute drive number counter FLG.

Here, the pulse counter PLSCNT is an area for counting flow rate pulses by the flow rate pulse interrupt process shown in FIG. 10, and the pulse timer counter Pta+ is an area for counting flow rate pulses by the timer interrupt process shown in FIG. The bubble extinguishing wait timer tA measures the clock pulses after the displacement sensor 58 outputs the main valve displacement signal. , an area where a timer signal is emitted after a predetermined time tA (for example, 5 to 20 seconds) in which the bubbles will disappear, and the minute drive timer tl has a pulse stop flag PFLG of "1".
After that, a minute time ts (for example, 60 to 150
area where a minute drive stop signal is output after m5ec),
The minute drive number counter FLG is an area where the number of minute drives of the pump is set to, for example, "3" and is subtracted by "1" for each minute drive.

The present embodiment is constructed as described above, and its operation will now be described with reference to the time chart of FIG. 8 and the flow charts of FIGS. 9 to 11.

First, in the flow rate pulse interrupt process shown in FIG. 10, when a flow rate pulse is input from the flow rate pulse generator 16 regardless of the process shown in FIG. 9, the pulse timer counter Pt+w is reset to zero by the interrupt process (step 5ill). A stop flag PF provided in the pulse timer counter Ptm
Set LG to "0" to indicate refueling step 3112
), and the value of the pulse counter PLSCNT is incremented by 1, and the amount of oil to be supplied is calculated (step 3113).
.

On the other hand, in the timer interrupt processing shown in FIG. 11, when a clock pulse is input from the oscillator 69 regardless of the processing shown in FIG. Compare the counted clock pulse number Ptea with a predetermined value,
Determine whether the refueling operation has stopped (step 512
2). Then, the number of clock pulses Ptn+ is set to a predetermined value K(
For example, if the value reaches 1 second), it is confirmed that the refueling has stopped, and the pulse stop flag PFLG is
Let be rlJ.

Here, if the pulse stop flag PFLG is "0", the flow rate pulse is continuously inputted, and if it is "1", it is assumed that the refueling has stopped, and a flag is set in the CPU 64. Move the flowchart to the next process.

Next, the overall processing of the full tank refueling operation will be described based on the flowchart shown in FIG.

First, when the refueling nozzle 19 is removed from the nozzle housing 20 in order to refuel a vehicle parked near the refueling device 11, a close 2 signal is output from the nozzle switch 21, and refueling begins (step 31). By inputting this closing signal to the processing circuit 63, the RAM is stored under the control of the CPU 64.
66 pulse counter PLSCNT, bubble disappearance wait timer tA, and minute drive timer tll are reset (step S2). In addition, the pump motor 14 is driven via the pump motor drive circuit 61 (step S3),
The previous displayed value in the refueling amount display 22 is reset to zero via the display drive circuit 62.

Now, if the refueling operation is stopped after proceeding to step S3, the refueling nozzle 19 is hooked to the nozzle storage part 20, and an open signal is output from the nozzle switch 21 to the processing circuit 63 (step S4). Then, the process moves to step 313, where the drive of the pump motor 14 is stopped, and the refueling is completed.

However, when the discharge pipe 33 of the refueling nozzle 19 is inserted into the fuel tank of the vehicle and the operating lever 56 is pulled up, the auxiliary valve body 4 constituting the valve mechanism 39 is moved via the main valve displacement mechanism 45.
2. The main valve bodies 40 are sequentially opened, and the fluid flow path 32 is wide open. As a result, the oil in the underground tank flows through the pipe 13, pump 15, flow meter 17, and hose 18 to the oil supply nozzle 19.
It is discharged from. The flow rate at this time is measured by the flow meter 17, a flow pulse is transmitted from the flow pulse transmitter 16, and the amount of refueling is counted by the flow pulse interrupt process shown in FIG. It is displayed on the oil supply amount display 22 via. In addition, refueling nozzle 1
When oil flows through the inside of the negative pressure pipe 35 due to the negative pressure generation mechanism,
Although the air inside is sucked, the main valve displacement mechanism 45 does not operate while the detection hole 34 is open to the atmosphere.

When refueling continues in this way, oil liquid is discharged from the discharge pipe 33 into the fuel tank, but at this time, the air sucked from the negative pressure generation mechanism is also discharged, and the air becomes bubbles. It gets mixed into the liquid and causes bubbles inside the fuel tank.

As refueling progresses, the bubbles rise as the liquid level in the fuel tank rises, and the detection hole 34 becomes blocked by the bubbles or the liquid level. As a result, the air in the negative pressure chamber 54 constituting the main valve displacement mechanism 45 is sucked by the negative pressure generating mechanism, and the diaphragm 52 is displaced to the left side in FIG. 4 against the compression spring 55. The receiver attached to the diaphragm 52 is the plate 51
follows this and is displaced to the left, the roller 50 is removed from the valve rod 48, and the main valve body 40 is released from the open state. Thus, due to the hydraulic pressure acting on the main valve body 40 and the spring force of the spring 43, the main valve body 40 is displaced downward together with the valve body rod 48 against the spring force of the spring 49, and is seated on the valve seat 38. and close the valve. At this time, the valve body rod 48 has its enlarged diameter portion 48A.
comes into contact with the upper end of the hollow shaft 47, and only the main valve body 40 closes, but the auxiliary valve body 42 is prevented from closing by its tip 48B and continues to be in the open state. This state is exactly the state shown in FIG.

As mentioned above, the main valve displacement mechanism 45 operates, and the receiver moves to the plate 51.
When the photocoupler 6 is displaced, the shielding plate 59 attached thereto and constituting the displacement sensor 58 is also displaced in the direction of arrow A, and the photocoupler 6
From 0, a main valve displacement signal is output. (Thus, it is detected that the main valve body 40 of the refueling nozzle 19 is closed (step S5), and in response to the input of the main valve displacement signal, the processing circuit 63 outputs a pump motor stop signal, and the pump motor is stopped. The motor 14 is stopped (step 36).As a result, the discharge of oil from the oil supply nozzle 19 is stopped, and the flow rate characteristic during this period is shown as a symbol a in FIG.

Next, in response to input of the main valve displacement signal, a bubble extinguishing timer tA in the RAM 66 is started under the control of the CPU 64 (step S7), and the timer tA outputs a timer signal after 15 seconds (step S8).

During this time, the discharge of oil from the fuel nozzle 19 is stopped, so the bubbles in the fuel tank gradually disappear.

Then, the processing circuit 63 determines whether or not the detection signal is input from the liquid sensor 37 while the timer signal is output from the bubble disappearance waiting timer tA (step S9
). When the detection signal is input from the liquid sensor 37, the process moves to step S16, and the minute drive number counter FL
The number of times "3" is set in G, and the process moves to the minute drive from step SL7 onwards.

On the other hand, when no detection signal is input from the liquid sensor 37, the process moves to the next step SIO, where a pump drive signal is output and the pump motor 14 is restarted.

The embodiment shown in FIG. 8 shows a case where no detection signal is output from the liquid sensor 37, so step S10
When the pump motor 14 is restarted, oil is again discharged from the fuel supply nozzle 19 into the fuel tank. At this time, in the refueling nozzle 19, the main valve body 40 is closed and only the auxiliary valve body 42 is open, so that the fluid flows from the fluid passage 32 to the discharge pipe 33 only through the valve passage 41. Therefore, the flow rate at this time is in a constricted small flow state.

Then, in the next step 311, it is determined whether a detection signal is output from the liquid sensor 37 due to a rise in the liquid level or bubbles.
Further, in step 512, a waiting loop is created to monitor whether or not the nozzle switch 21 is opened or closed. For example, liquid sensor 3
If the nozzle switch 21 is opened while the detection signal is not being output from 7, the refueling operation is stopped during additional refueling, the refueling nozzle 19 is closed, and then the refueling nozzle 19 is moved to the nozzle housing 20. It is determined that the pump motor 14 is overloaded, and the pump motor 14 is stopped in the next step S13.
Refueling ends.

Further, when it is determined in step 311 that a detection signal is output from the liquid sensor 37, step 3
14, the pump motor 14 is stopped, and the next step S15
It is monitored whether the pulse stop flag PFLG has become "1" or not.

On the other hand, when the pump motor 14 stops, the transmission of flow rate pulses from the flow rate pulse generator 16 also stops, so the value of the pulse timer counter Ptm, which is executed by the timer interrupt processing as described above, is increased by a predetermined value. Therefore, the pulse stop flag PFLG is set to "1".

Thus, in step S15, the pulse stop flag PFLG
When it is determined that the number of times has become "1", it is assumed that the flow of oil has completely stopped, and "3" is set in the minute drive number counter FLG in step S16. Incidentally, the flow rate characteristics during this period are shown as reference numerals in FIG.

Next, when the re-driving of the pump motor 14 is stopped as described above, the process moves to step 317 and subsequent steps to confirm the full tank by minute drive control. Note that FIG. 8 shows a case where it is determined that the tank is not full in the first full tank check operation, and the tank is full in the second full tank check operation.

Therefore, the pump motor 14 is started (step 517).
, m When the small drive timer 1B starts (step 51
3), 'From the oil supply nozzle 19, the minute drive timer tIl
Oil is discharged only for the time set in . Then, in the next step S19, it is monitored whether the minute drive timer t has reached the set time, and when the minute drive timer t has reached the set time, a minute drive stop signal is output and the pump motor 14 is stopped (step 520). Then, in step S21, the pulse stop flag PFLG is set to "
1", the next step S22
Then, it is determined whether a detection signal is input from the liquid sensor 58 or not. Note that the flow rate characteristic during this period is indicated by symbol C in FIG.

Now, in this embodiment, depending on the first minute drive,
A detection signal is continuously output from the liquid sensor 37, and whether it is truly full depending on the liquid level, bubbles adhering to the detection sensor 37, or liquid locally adhering to the negative pressure pipe 35. In other words, it is not possible to determine whether the liquid is due to the bridging phenomenon.

In this way, as a result of the determination in step S22, in the next step S23, the set number of times of minute drive number counter FLG is "3".
"1" is subtracted from "1" to set the set number of times to "2", and after determining in the next step S24 that the counter FLG is not rOJ, the minute drive timer t3 is reset. Then, it is determined whether or not the nozzle switch 21 is open (step 526), and if it is open, it is assumed that the refueling operation is continuing, and the start FL is
If the number of times G is set is "0", it means that the full tank check has been completed as described later, and if the nozzle switch 21 is opened in step 326, the refueling operation is stopped midway. , refueling ends.

As mentioned above, when the process returns to step S17 and the second minute drive is started, the oil liquid is again minutely discharged from the oil supply nozzle 19 in steps SL8 to S21, and the flow rate characteristics during this time are as shown in FIG. is denoted by the symbol d. In this embodiment, as a result of this minute discharge, the liquid sensor 37
This means that the detection signal from the bubble has disappeared, and the previous detection signal is due to the adhesion of bubbles or bridging. Therefore, in step S22, it is determined that the detection signal has disappeared, and the process returns to step SIO to restart the liquid supply.

Therefore, the operation after refueling is resumed will be described next.

Since the refueling nozzle 19 is currently throttled to a small flow rate, the second additional refueling is performed at a small flow rate by restarting the pump motor 14. This additional lubrication continues until the liquid sensor 37 outputs a detection signal again (step 5ll), and the pump motor 14 stops (step 514), after the lubrication stop flag PFLG becomes "1" Set drive number counter FLG to "3"
(step S15.516). In this way, additional liquid supply at a predetermined flow rate has been performed, and the flow rate characteristics during this period are shown as symbol e in FIG.

Furthermore, when the above-mentioned processing is completed, step SL is performed again.
The minute drive process and the full tank confirmation process from 7 to S26 are started. In the case of this embodiment, it is assumed that when the liquid sensor 37 outputs the detection signal again, the inside of the fuel tank is truly full. For this reason, step 817
In the first minute drive in ~S26, the detection signal does not disappear from the liquid sensor 37, and the minute drive number counter FLG is simply set to "2".

Hereinafter, the second and third minute drives are the same as the first time. The flow rate characteristics during this period are indicated by symbols f and gth in FIG.

In this way, step S22 is performed by micro-driving a total of three times.
In this case, a detection signal is continuously output from the liquid sensor 37, which means that full refueling is confirmed. As a result, after the third minute drive, the number of times set in the minute drive number counter FLG also becomes "0", and after confirming this in step S24, the process moves to step S27.

Therefore, the operator holding the refueling nozzle 19 automatically exits from the operating state of the refueling amount indicator 22. As a result, the hollow shaft 46 is displaced downward together with the valve body loft 48 by the springs 43 and 44, and the auxiliary valve body 42 also moves toward the main valve body 40.
Sit down and close the valve.

On the other hand, when the refueling nozzle 19 is pulled up from the fuel tank,
The inside of the negative pressure chamber 54 becomes atmospheric pressure again, and the roller 50 is fitted into the valve rod 48 again by the spring 55, returning to the initial state. Finally, insert the refueling nozzle 19 into the nozzle storage part 20.
When the nozzle switch 21 is opened, step 5
27) A series of refueling operations are completed and preparations are made for the next refueling operation.

Note that in the embodiment of the present invention, steps 85 to S8
The processing operations up to and the bubble extinguishing timer tA are specific examples of the liquid supply stop means according to the present invention, and steps 89 to 31
The processing operations up to step 4 are specific examples of the liquid supply restart means, and the processing operations of steps SL5 to SL327, the pulse timer counter Ptm, the micro drive timer t, and the micro drive number counter FLG are micro drive. This is a specific example of the means, and step 322 is a specific example of the full tank confirmation means. However, the present invention is not limited to the above-mentioned embodiments, and various processing programs can be employed, or the present invention may be constructed using a hardware circuit.

In addition, in the embodiment, a fixed type fuel supply device is taken as an example of the fuel supply device, but a suspended type gasoline fuel supply device may also be used (on the other hand, it may be applied to a shipping device for tank lorries, tank cars, etc.).

Furthermore, in the embodiment, driving and stopping of the pump motor 14 was cited as an example of a liquid sending means for flowing oil through the pipe 13, but a solenoid valve is provided in the middle of the pipe 13, and the solenoid valve is opened and closed. Liquid feeding control may be performed by In this case, steps S10 and S17 are set to "open the solenoid valve", and step S
6. S14゜S20 is set to "Solenoid valve closed", and step S3
Insert the step "Solenoid valve open" after step S26. It is sufficient to return S27 to before step S13.

〔Effect of the invention〕

The liquid supply device according to the present invention is as described in detail above, and after normal liquid supply at a large flow rate, the liquid supply is stopped for a predetermined time to wait for the bubbles to disappear, and then the liquid supply is resumed until the liquid sensor is activated. Since it is configured to perform minute drive operations and full tank confirmation operations, it is possible to always reliably supply a full tank of liquid, and also reduces the complicated operations by the operator, thereby shortening the time required for liquid supply work. be able to.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram showing the basic configuration of a fluid supply device according to the present invention, FIGS. 2 to 11 relate to embodiments of the present invention, and FIG. 2 is an overall configuration of a fluid supply device used in this embodiment. Fig. 3 is a vertical cross-sectional view of main parts showing the specific structure of the refueling nozzle used in this example, Fig. 4 is a cross-sectional view in the direction of the IV-IV arrow in Fig. 3, and Fig. 5 is a main valve displacement FIG. 6 is a circuit configuration diagram of this embodiment; FIG. 7 is an explanatory diagram showing the specific configuration of the RAM in FIG. 6; Fig. 8 is a time chart showing the operation of this embodiment, Fig. 9 is a flowchart showing the refueling processing operation of the refueling device, Fig. 10 is a flowchart showing flow rate pulse interrupt processing, and Fig. 11 is a timer interrupt processing. FIG. DESCRIPTION OF SYMBOLS 11... Oil supply device, 13... Piping, 14... Pump motor 1, 15... Pump, 16... Flow rate pulse transmitter, 17... Flow rate needle, 18... Hose, 19・
...Refueling nozzle, 21... Nozzle switch, 22...
- Oil supply amount indicator, 23... Control device, 31... Nozzle body, 33... Discharge pipe, 35... Negative pressure pipe, 3
7...Liquid sensor, 39...Valve mechanism, 45...Main valve displacement mechanism, 56...Operation lever, 58...Displacement sensor (liquid level preliminary detection means), 63...Processing circuit , 64・
...CPU, 65...ROM, 66...RAM.

Claims (2)

[Claims] (1) A liquid supply means consisting of a pump or an electromagnetic valve provided in the middle of a flow path that connects to a tank on one side, and a liquid supply nozzle provided on the other side of the flow path and having a discharge pipe at its tip. In the liquid device, a liquid sensor is provided on the discharge pipe of the liquid supply nozzle and is activated when an oil liquid is detected, and a liquid sensor is provided on the liquid supply nozzle and detects when the liquid level has reached nearly full level. a surface preliminary detection means, a liquid supply stop means for stopping the liquid supply means for a first predetermined time based on a signal from the liquid surface preparation detection means, and after the first predetermined time by the liquid supply stop means has elapsed; a liquid supply restarting means for activating the liquid supply stopping means again and stopping the operation when a detection signal is input from the liquid sensor; micro-driving means for micro-driving the liquid feeding means by repeating a plurality of times for a second predetermined time each time; A liquid supply device comprising: a full tank confirmation means for stopping the liquid supply means, and stopping the operation of the minute drive means when the detection signal disappears, and activating the liquid supply restart means again. (2) The liquid supply device according to claim (1), wherein the liquid level equipment detection means is a displacement sensor provided in a main valve displacement mechanism operated by negative pressure.