JP3344493B2 - Liquid supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid supply system for liquids such as gasoline, light oil and other vehicle fuels.

[0002]

2. Description of the Related Art Conventionally, a liquid supply device, such as an automobile fuel such as gasoline or light oil, which is required to be accurately measured for a transaction, requires a high measurement accuracy. Mainly used. In such a liquid supply device, if air or the like is mixed in the liquid, the flow rate is excessively measured. Therefore, usually only the liquid is measured by removing the gas such as air mixed in the liquid by an air separation device or the like. Like that.

[0003]

However, in the air separation device used in such a liquid supply device, the pressure loss is large, and a large motor is used. Therefore, a large amount of energy is required, and vibration and noise are reduced. There is a drawback that the device becomes large and the device becomes large.

On the other hand, when a gas is mixed with a liquid, the volume of the gas shrinks when pressure is applied, and a certain amount of the gas dissolves in the liquid and when the pressure applied to the liquid increases,
It is known that Henry's law increases the solubility of a liquid. According to the study of the present inventor, for example, gasoline dissolves up to about 20% of air at 1 atm and 0 ° C, but when pressure is increased to 5 atm or more, it dissolves almost 100%. It has been found that the entrained air can be ignored. That is, it has been found that if a pressure of about 5 to 10 atm is applied to gasoline, the same accuracy as in the case where air is separated and removed and measured is obtained.

Accordingly, an object of the present invention is to provide an energy-saving and small-sized liquid supply device in which pressure is applied to a liquid to increase measurement accuracy, reduce vibration and noise, and save energy.

[0006]

In order to achieve the above object, a liquid supply device according to the present invention is a liquid supply device for measuring a liquid mixed with a gas, the liquid supply device having a permanent magnet fixed at a central portion.
A plunger made of a magnetic material is provided at one end with a suction port and
Inside a cylinder made of non-magnetic material with a discharge port
And a solenoid provided at an outer diameter portion of the cylinder.
The permanent magnet is repelled by the magnetic field
The plunger is reciprocated in the cylinder by suction
While inhaling and discharging the body, the pressure of the liquid on the discharge side is increased
A linear motor pump with a pressure sensor to measure
Suction valves provided at the suction port and discharge port of the cylinder
And control the opening and closing of the discharge valve and the current flowing through the solenoid
Pressure sensor after sucking the liquid from the suction port
To the liquid in the cylinder based on the pressure signal detected in
Compress by applying constant pressure, then discharge liquid in cylinder
Timing control means for repeating control to perform
Control means sucks into the cylinder of the linear pump motor
When a constant pressure is applied to the
Plunge detected by the position sensor that detects the position of the plunger
Gauge to calculate the volume of liquid under pressure from the
Volume means .

[0007]

The liquid supply device according to the present invention has a timing control means.
Control when the linear pump draws liquid.
Apply predetermined pressure with the lancer and adjust the position of this plunger.
Detect by position sensor and calculate capacity by weighing means
The pressure is applied to the liquid and the flow rate is measured.
Liquid with mixed gas, but liquid with those gases removed
The same accuracy as when weighing the body is obtained.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; FIG. 1 is a diagram illustrating the configuration of a liquid supply device according to a first embodiment of the present invention.

In FIG. 1, a liquid supply device according to the present embodiment includes a pump 10, a timing control circuit (timing control means).
30, a measuring circuit (measuring means) 40, an integrating display circuit (integrating displaying means) 50, and the like.

The pump 10 includes a cylinder 11, a plunger 12, solenoids 14a and 14b, a position sensor 15
And a buffer spring 16 and the like. The cylinder 11 is formed in a cylindrical shape from a non-magnetic material, and is provided with a suction port 17 and a discharge port 18 at one end thereof, a suction valve 20 at the suction port 17, and a discharge valve 21 at the discharge port 18. Is provided. The cylinder 11 is provided with a plunger 12 which reciprocates in a liquid-tight manner in contact with the inner diameter thereof, and a buffer spring 16 is provided on the side opposite to the suction port and the discharge port. The plunger 12 is made of a non-magnetic material, and a strong permanent magnet 13 such as a rare earth magnet magnetized such that both ends in the length direction become N pole and S pole is fixed to a substantially central portion thereof.
The outer diameter of the cylinder 11 has a plunger 12
The two solenoids 14 are located almost at both dead centers of the
a and 14b are provided, and a position sensor 15 for measuring the position of the plunger 12 is provided at the center thereof. As such a position sensor 15, for example, a Hall element for detecting the magnetism of the permanent magnet 13 provided in the plunger 12 is used. The suction port 17 is piped to a tank 23 storing a liquid such as gasoline via a suction valve 20 and a check valve 22, and the discharge port 18 is
Discharge valve 21, accumulator 2 for rectifying pulsating flow
5. It is connected to a fueling nozzle having a nozzle valve 27 via a pressure reducing valve 26 for reducing the liquid pressure to a constant pressure. Further, a pressure sensor 19a for measuring the pressure of the liquid and a temperature sensor 19b for measuring the temperature thereof are provided near the discharge port 18 and upstream of the discharge valve 21.

The timing control circuit 30 receives the lever signal from the nozzle valve 27 and the detected pressure signal from the pressure sensor 19a, and inputs the current directions of the solenoids 14a and 14b for moving the plunger 12, the suction valve 20 and the discharge valve. This is a circuit for controlling the opening / closing timing of the discharge valve 21 of the outlet 18.

The measuring circuit 40 measures the volume of the liquid based on the position of the plunger 12 detected by the position sensor 15, the temperature detected by the temperature sensor 19b, and the timing signal output from the timing control circuit 30. Circuit.

The operation of the liquid supply device having the above configuration will be described. FIG. 3 is a timing chart for explaining the operation of the liquid supply device according to the first embodiment of the present invention.

First, the plunger 12 is located on the side of the discharge port 18 in the cylinder 11 and is provided with the suction valve 20 and the discharge valve 2.
1 are both closed. Next, in order to start refueling, when the lever provided on the refueling nozzle is operated to open the nozzle valve 27, a lever signal for starting refueling is given to the timing circuit 30. After opening the suction valve 20, the timing control circuit 30 causes current to flow through the solenoids 14a and 14b so that a magnetic field that moves the plunger 12 to the suction side, that is, to the left in FIG. The N and S poles of the magnet 13 are repelled and attracted by this magnetic field, the plunger 12 moves to the left, and the liquid stored in the tank 23 becomes
It is sucked into the cylinder 11 through the check valve 22, the suction valve 20, and the suction port 17. When the plunger 12 moves to the left and reaches the position of the left dead center of the stroke, the plunger 12 abuts on the buffer spring 16 and stops at the position shown by the dotted line. When the position sensor 15 detects the position of the left dead center, the timing control circuit 30 controls the solenoids 14a and 14b.
After shutting off the current to the suction valve 20, the suction valve 20 is closed. Thereby, the suction stroke by the pump 10 is completed.

Next, in the timing control circuit 30, a current is applied to the solenoids 14a and 14b so that a magnetic field for moving the plunger 12 in the right direction acts, and the plunger 12 moves in the right direction. At this time, the suction valve 20 and the discharge valve 21
Are closed, the liquid in the cylinder 11 is compressed and the pressure rises to reach the peak point (a in FIG. 3). As a result, the air and the like contained in the liquid are compressed, and at the same time, the solubility is increased and the air is dissolved in the liquid as described above. When the pressure of the liquid reaches a certain peak pressure, for example, about 10 atm, the pressure sensor 19a detects the pressure and is supplied to the timing control circuit 30. At this time, the measuring circuit 40 calculates and stores the volume of the compressed liquid based on the signal regarding the position of the plunger 12 given from the position sensor 15. Thereby, the compression stroke by the pump 10 is completed.

Next, the timing control circuit 30 opens the discharge valve 21. As a result, the plunger 12 moves to the right while discharging the liquid in the cylinder 11, and the discharge port 1
8. Refueling is performed by a refueling nozzle via a discharge valve 21, an accumulator 25, a pressure reducing valve 26, and a nozzle valve 27. When the plunger 12 reaches the position of the right dead center, the timing control circuit 30 cuts off the currents of the solenoids 14a and 14b based on the signal detected by the position sensor 15,
The discharge valve 21 is closed. Thereby, the discharge stroke by the pump 10 is completed.

Next, the same operations of suction, compression, and discharge as described above are repeated again, and the refueling is continued. This behavior is
This is repeated as long as the nozzle valve 27 is opened and the signal is continuously sent to the timing control circuit 30, and the refueling is continued.
Since the discharged liquid forms a pulsating flow every stroke, it is rectified by the accumulator 25, and since the pressure is high, it is reduced to a constant pressure by the pressure reducing valve 26.

The amount of refueling for each cycle is determined by the amount of liquid discharged from the cylinder 11, and the measuring circuit 40 determines from the position of the plunger 12 when the pressure of the pressure sensor 19a reaches 10 atm. It is determined by calculating the product of the stroke up to the right dead center position and the sectional area of the cylinder 11. At this time, the volume changes depending on the temperature, so that the temperature is corrected, so that the weighing circuit 40 corrects the weighing based on the temperature signal given from the temperature sensor 19b. The volume of the liquid calculated by the measuring circuit 40 is integrated in the integrating display circuit 50 and displayed on the display 51.

According to the above configuration, even when a liquid mixed with a gas such as air is measured, if the void ratio is 30% by volume or less in a gas-liquid two-phase flow, the liquid can be accurately separated without separating the gas. And an air separation device such as a conventional liquid supply device is not required. Further, in this embodiment, since a linear motor pump is used, the pump and the motor are integrated, so that the equipment is reduced in size, and a conventional pump or motor is used.
The weighing machine becomes unnecessary and a compact weighing machine can be realized.

FIG. 2 is a view for explaining the structure of a liquid supply device according to a second embodiment of the present invention. The parts corresponding to those in FIG. 1 are denoted by the same reference numerals.

In the figure, the liquid supply device of the second embodiment has two first pumps having the same structure as the pump of the first embodiment.
Pump 10 and second pump 10 ′ (hereinafter referred to as first pump 10 ′)
The first and second pumps 10 and 10 ′ are operated at predetermined different timings by the timing control circuit 30, and the first and second pumps 10 and 10 ′ are operated from the tank 23. The sucked liquid is measured by the position sensors 15 and 15 ′ in a state where pressure is applied, respectively, the volume of the liquid is calculated by the measuring circuit 40, the volume is integrated by the integrating display circuit 50, and displayed on the display 51. It is configured as follows. Other details of the configuration are the same as in the first embodiment.

FIG. 4 is a timing chart for explaining the operation of the liquid supply apparatus according to the second embodiment of the present invention. In the drawings, only the pump process is described, and the description of the solenoid current, the cylinder internal pressure, the opening and closing of the suction valve and the discharge valve is omitted. The same applies to the following timing charts.

The operation timing of the liquid supply device of the second embodiment is such that the first pump 10 and the second pump 10 'perform suction, compression and discharge, respectively, as shown in the pump process of FIG. On the contrary, they operate at different timings.

In this embodiment, the two first and second pumps 10 and 10 'operate at different timings opposite to each other, so that the pulsating flow can be reduced and the moving directions of the plungers 12, 12' and the like are mutually different. In the opposite direction, the mechanical vibration can be reduced, and the oil supply capacity can be increased. Other operations are the same as in the first embodiment.

As another embodiment, for example,
As shown in FIG. 4, if the first to fourth pump processes are operated at mutually different timings, the pulsating flow can be further reduced as compared to the second embodiment, The mechanical vibration can be reduced, and the oil supply capacity can be increased. For example, with four pumps, one
Even with a cylinder having a small stroke discharge of about 20 cc, an oil supply facility for 60 liters per minute can be obtained by supplying power at a frequency of 50 cycles.

That is, by arranging a plurality of pumps having different operation timings in parallel, the pulsating flow can be reduced, the mechanical vibration can be reduced, and the oil supply capacity can be further increased.

In the above embodiment, a linear motor pump is used. However, a reciprocating pump using air pressure may be used, and a similar effect can be obtained with a normal crank rotary plunger pump. In the case of a multi-cylinder pump, the size can be further reduced by synchronizing a large number of intake valves and discharge valves with one rotary valve.

In the above embodiment, the position sensor 15 using a Hall element or the like has been described as an example. However, the present invention is not limited to this, and at least the position of the plunger 13 when a pressure is applied to the liquid can be detected. Sensors can be used.

[0029]

As described above, according to the liquid supply device of the present invention, the liquid to be measured is measured in a state in which pressure is applied, so that even when the liquid containing gas such as air is measured, the liquid to be measured can be used. The same accuracy as in measuring the liquid from which the gas has been removed can be obtained, vibration and noise are reduced, and there is an effect that energy can be saved and the size can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a liquid supply device according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a liquid supply device according to a second embodiment of the present invention.

FIG. 3 is a timing chart for explaining the operation of the liquid supply device according to the first embodiment of the present invention.

FIG. 4 is a timing chart for explaining the operation of the liquid supply device according to the second embodiment of the present invention.

FIG. 5 is a timing chart illustrating an operation of a liquid supply device according to another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 pump 11 cylinder 12 plunger 13 permanent magnet 14 a, 14 b solenoid 15 position sensor 16 buffer spring 17 suction port 18 discharge port 19 a pressure sensor 19 b temperature sensor 20 suction valve 21 discharge valve 22 check valve 23 tank 25 accumulator 26 pressure reducing valve 27 nozzle valve Reference Signs List 30 timing control circuit (timing control means) 40 weighing circuit (weighing means) 50 integration display circuit (integration display means) 51 display

Continuation of the front page (56) References JP-A-54-9559 (JP, A) JP-A-55-162011 (JP, A) JP-A-59-26497 (JP, A) Real opening 58-80531 (JP, A) , U) Shokai Sho 61-131644 (JP, U) JP-B 62-28409 (JP, B1) JP-B 54-15496 (JP, B1) JP-B 5-29853 (JP, B2) Sho-JP 41-10937 (JP, B1) Jikken 40-8455 (JP, Y1) Jikgyo 6-20976 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B67D 5/08 G01F 11/02 G01F 15/08

Claims (1)

(57) [Claims] 1. A liquid supply device for measuring a liquid mixed with a gas, wherein a non-magnetic material having a permanent magnet fixed to a central portion is provided.
Plunger with suction and discharge ports at one end
Is installed in a cylinder made of
Apply current to the solenoid provided on the outside diameter of the cylinder.
By repelling and attracting the permanent magnet by the magnetic field,
Move the plunger back and forth in the cylinder to suck
To measure the pressure of the liquid on the discharge side
A linear motor pump provided with a force sensor and the cylinder
Suction and discharge valves provided at the suction and discharge ports, respectively
By controlling the opening and closing of the solenoid and the current flowing through the solenoid.
Detected by the pressure sensor after inhaling the body from the inlet
A constant pressure is applied to the liquid in the cylinder based on the pressure signal.
To compress and then discharge the liquid in the cylinder.
Repeating timing control means, and the timing control means
The stage converts the liquid sucked into the cylinder of the linear pump motor
When a constant pressure is applied by the plunger, the position of the plunger
From the plunger position detected by the position sensor that detects the position
Metering means for calculating the volume of liquid under pressure
A liquid supply device comprising: