JP2003148720A - Liquid supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid supply device which maintains a flow rate under a restriction of the maximum delivery pressure, and controls noises and vibrations by smoothing pulsation of a discharge flow from an electromagnetic pump. SOLUTION: An electromagnetic pump 1C comprises a closed valve 18 and a check valve 173 which stop inflow or outflow of a liquid to the pump when driving is suspended, wherein a gas damper 5 which includes a damper room 51 and a fuel discharge pipe 52 is installed inside a fuel delivery pipe 171. The pulsation change of the discharging liquid due to the operation of the electromagnetic pump is absorbed by the gas damper, thereby smoothing the pulsation. In addition, by using elastic pipes in some portions of pipes which connects the electromagnetic pump and a liquid surface control device to send a fuel liquid, the pulsation change of the discharging liquid is also absorbed by expansion and contraction of the pipes, thereby smoothing the pulsation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention properly controls a fuel liquid such as petroleum or kerosene stored in a fuel tank regardless of fluctuations in external load pressure and suppresses the influence of noise and vibration due to pulse pressure. The present invention relates to a liquid supply device that can be temporarily stored in a relay between a fuel tank and a combustion device and pumped up to a relay tank so-called oil leveler for adjusting the liquid level.

[0002]

2. Description of the Related Art Conventionally, a plunger, which is internally slidably contacted with a cylinder, is vibrated in the axial direction by a periodical change of magnetic force so that fuel in a fuel tank is discharged toward a combustion device. Electromagnetic pumps are known. Such an electromagnetic pump is normally attached to a fuel tank of an oil heater used for heating as an electromagnetic pump for combustion, and discharges fuel toward a combustion device provided directly above the fuel tank. .

When using these electromagnetic pumps, 50H
It is usually driven by a pulse of half-wave rectified commercial alternating current of z, 60 Hz.
Pulsation occurs in the ejected liquid by reciprocating once or 60 times. In order to smooth this pulsation, an accumulator connected in close proximity to the upstream side of the shutoff valve facing the discharge port of the electromagnetic pump (see Japanese Patent Laid-Open No. 4-203803) or the discharge check valve to the discharge port. It is known that an elastic tubular diaphragm is built into a tubular cavity provided in the middle of the discharge passage leading to the discharge passage (see Japanese Utility Model Publication No. 03-41099).

As a method of supplying a fuel liquid to a combustion device, a fuel is pumped up to an intermediate tank provided between the fuel tank and the combustion device by an electromagnetic pump for pumping and temporarily stored in the intermediate space. . The present applicant intends to prevent leakage of fuel into a pump in this type of electromagnetic pump irrespective of the height or difference in the lift (the height difference between the liquid level in the fuel tank and the electromagnetic pump) for sucking fuel. (Japanese Patent Application No. 2000-228565).

Fuel is normally supplied to the combustor from an external tank in an oil water heater, a boiler for hot water room heaters, a forced air supply / exhaust type oil warmer, and the like. At this time, if the external tank cannot be installed at a place sufficiently higher than the combustor, or if it is at a low place, it cannot be naturally supplied due to the drop from the external tank.

Further, the relay tank is often installed in an oil combustor such as a boiler or a forced oil supply / exhaust type oil warmer, and is used as a so-called oil leveler for maintaining a constant level of fuel from an external fuel tank. To be
When the liquid level of the liquid fuel that is consumed for combustion drops, this oil leveler transmits the buoyancy of the float by the principle of this lever to operate in the direction of opening the needle valve and let the oil from the external fuel tank flow in, When the surface rises, the needle valve is closed to keep the liquid level constant by constantly balancing the combustion amount.

In the electromagnetic pump used for the above purpose, since the plunger acts as a free piston, air is also properly sucked, and the fuel in the fuel tank is burned even if air is present in the pipe at the early stage of driving the pump. It is also possible to send it to a relay tank. This is the reason why such an electromagnetic pump is applied as a pumping pump.

[0008]

In the technical field of electromagnetic pumps, when the relay tank is used as an oil leveler, there is a problem that the needle valve and the float in the oil leveler vibrate due to the pulsating pressure and generate noise.

This phenomenon of vibration is not a problem when the flow rate of the fuel liquid is high, but occurs when the flow rate of the fuel liquid becomes low after the needle valve starts to close. Since the displacement of the electromagnetic pump when the plunger reciprocates is the discharge amount,
Pulsating pressure that fluctuates with each cycle of the pulse is generated.
The reason for this is that the accumulator does not sufficiently accumulate the pressure and smooth the pulsating pressure.

Further, if an oil leveler of a conventional model, which is supplied in a pulsating flow due to a drop, is used for pumping up, there is no space for adding a liquid level sensor or a margin for adding a control circuit, or cost reduction is achieved. From the viewpoint, the liquid level sensor may not be used. In this case, the drive of the pumping pump cannot be turned on and off depending on the position of the liquid level, so it is necessary that the needle valve does not open due to the discharge pressure of the pump even when the pump is driven when the liquid level rises and the needle valve closes. is there. This is to call the internal pressure when closing the needle valve of the discharge side of the pipe, that is, the needle valve of the oil leveler, to be referred to as the sealing closing pressure, it is necessary that the discharge pressure of the pumping pump is equal to or less than the opening pressure of the needle valve, That is, it means that the maximum discharge pressure (closed closing pressure) of the pumping pump is limited.

Generally, in an electromagnetic plunger pump, the flow rate is determined by the difference between the discharge pressure generated when the plunger moves upward and the external load pressure. Therefore, when the external load pressure fluctuates, the discharge amount also fluctuates, and the load The influence of the pressure increases as the discharge pressure decreases. It should be noted that this load pressure fluctuates with time because air bubbles staying in the filter in the oil leveler, the needle valve, and the discharge pipe of the downward gradient dissolve in the fuel with time. When there is a pulsation in the discharge pressure, the peak value of the pulsation becomes the maximum discharge pressure, and the discharge pressure must be lowered due to the maximum discharge pressure limitation described above, so that the effective discharge pressure is kept low. Under the above circumstances, if the smoothing action of the accumulator is not sufficient, there is a problem that the discharge amount is easily changed with respect to the pressure change.

When an abnormally high hydraulic pressure is applied to the suction side of the electromagnetic pump, the check valve in the pump may be pushed downstream by the hydraulic pressure to close the outlet. .

The present invention has been made in view of the above situation, and can properly and properly supply liquid fuel such as petroleum and kerosene stored in a fuel tank regardless of fluctuations in external load pressure. Liquid supply that can be pumped up while suppressing the effects of noise and vibration due to pulse pressure, and that is particularly suitable as a relay tank function with a liquid level adjustment function that temporarily stores in a relay between the fuel tank and the combustion device. The purpose is to provide a device.

[0014]

The invention according to claim 1 is
In a liquid supply device equipped with an electromagnetic pump that discharges liquid by reciprocatingly driving an electromagnetic plunger toward a liquid level adjusting device that adjusts the liquid level to a predetermined value, this electromagnetic pump is stopped. Has a stop valve and a check valve for closing the inflow or discharge of the liquid into the pump main body in a state, and at least a part of the piping path connecting between the electromagnetic pump main body and the liquid level adjusting device is It is made of an elastic material so as to absorb the pulsation of the discharged liquid generated in the pipe path by the reciprocating movement of the plunger.

In this structure, the pulse pressure fluctuation of the discharged liquid due to the operation of the electromagnetic pump is absorbed and smoothed by the expansion and contraction of the piping path made of the elastic body. Further, vibrations and vibration noises transmitted to the liquid level adjusting device via the members forming the piping path are suppressed.

According to a second aspect of the present invention, there is provided a liquid supply device including an electromagnetic pump for discharging liquid by reciprocatingly driving an electromagnetic plunger toward a liquid level adjusting device for adjusting the liquid level to a predetermined value. , The electromagnetic pump has a stop valve and a check valve for closing the inflow or discharge of the liquid into the pump body in a state where the drive is stopped, and connects the electromagnetic pump body and the liquid level adjusting device. The gas damper is built in or attached externally to the electromagnetic pump so as to face the piping path.

According to the present invention, the pulse pressure fluctuation of the discharged liquid due to the operation of the electromagnetic pump is absorbed by the gas damper, the pulsation is smoothed, and the vibration and vibration noise transmitted to the liquid level adjusting device can be suppressed.

According to a third aspect of the present invention, there is provided a liquid supply device including an electromagnetic pump for ejecting liquid by reciprocatingly driving an electromagnetic plunger toward a liquid level adjusting device for adjusting the liquid level to a predetermined value. , The electromagnetic pump has a stop valve and a check valve for closing the inflow or discharge of the liquid into the pump body in a state where the drive is stopped, and the electromagnetic pump body and the liquid level adjusting device are connected to each other. An accumulator having a side chamber separated by an elastic diaphragm facing a connecting pipe path is built in or attached to the electromagnetic pump.

According to this invention, the pulse pressure fluctuation of the discharged liquid due to the operation of the electromagnetic pump is absorbed by the accumulator,
It is possible to smooth the pulsation and suppress the vibration and the vibration sound transmitted to the liquid level adjusting device.

According to a fourth aspect of the present invention, there is provided a liquid supply device equipped with an electromagnetic pump for discharging liquid by reciprocating driving of an electromagnetic plunger toward a liquid level adjusting device for adjusting the liquid level to a predetermined value. , The electromagnetic pump has a stop valve and a check valve for closing the inflow or discharge of the liquid into the pump body in a state where the drive is stopped, and the electromagnetic pump body and the liquid level adjusting device are connected to each other. The accumulator having a side chamber separated by an elastic diaphragm facing the connecting pipe path is built in or externally attached to the liquid level adjusting device.

In this structure, the accumulator is incorporated in the liquid level adjusting device, and thereby the same operation as that of claim 2 or 3 can be obtained.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the overall structure of a liquid supply apparatus according to a first embodiment. The liquid supply device includes an electromagnetic pump 1, a liquid level adjusting device 2 having a function of adjusting the liquid level of a fuel liquid relay tank, and a liquid level adjusting device 2, and a pipe path 3 for connecting the components to transport a fuel liquid. Here, the piping path 3 refers to the flow path of the entire process of liquid transportation from the fuel discharge part 17 of the electromagnetic pump 1 to the needle valve 211 of the liquid level adjusting device 2.

The fuel liquid is supplied from a fuel tank TK (not shown).
It is pumped up by the electromagnetic pump 1 and supplied to the liquid level adjusting device 2 via the piping path 3. The liquid fuel relayed and stored in the liquid level adjusting device 2 is pumped up by the fuel suction pipe 91 and the combustion pump 92, and sent to the combustion chamber 93 (not shown) for consumption. The electromagnetic pump 1
1 and the liquid level adjusting device 2, the liquid level adjusting device 2 is located on the second floor of the building, the electromagnetic pump 1 is located on the first floor, and the fuel tank It is possible that TK is underground.

The electromagnetic pump 1 has an electromagnetic coil 15 at the center.
, A yoke 54 forming a magnetic path, an upstream fuel suction portion 16, and a downstream fuel discharge portion 17.
A fuel suction hole 162e is opened at the upstream end of the fuel suction portion 16, and the pump nut 19a pumps up the pump pipe 19
b is fixed and connected. The details of the electromagnetic pump 1 will be described later with reference to FIG. 2 showing the second embodiment.

The liquid level adjusting device 2 includes a filter chamber 22 containing a filter 22a for filtering dust particles contained in fuel.
And a liquid level adjusting chamber 21 having a relay tank and a liquid level adjusting function. The liquid level adjusting chamber 21 includes a needle valve 211 that is an inlet for the fuel liquid, a float 212 that controls opening and closing of the needle valve 211, and a float support shaft 213.

Of the piping path 3, the piping path of the section connecting the electromagnetic pump 1 and the liquid level adjusting device 2 has a discharge pipe joint part 32 connected to the fuel discharge part 17 of the electromagnetic pump 1 and the liquid level adjusting device 2. The inflow pipe joint part 33 connected to the fuel liquid inflow side and the elastic pipe 31 which is a pipe path connecting the joint parts 32, 33.

The operation of the liquid level adjusting device 2 will now be described. The fuel that has passed through the filter 22a for filtering the dust particles in the fuel flows from the filter chamber 22 to the needle valve 211.
Through the liquid level adjusting chamber 21 or is blocked. One end of the needle valve 211 is connected to the float 212, and the float 212 has a float support shaft 213.
It is rotatably supported around. When the float 212 rises to a predetermined height due to the rise of the liquid level in the liquid level adjusting chamber 21, the buoyancy of the float 212 is transmitted to the needle valve 211 by the action of the lever with the float support shaft 213 as a fulcrum. The needle valve 211 is closed,
The rise of the liquid level 214 is prevented.

Fuel F stored in the liquid level adjusting chamber 21
Is pumped up by the combustion pump 92 through the fuel suction pipe 91 and consumed. When the liquid level 214 is lowered due to the pumping of fuel by the combustion pump 92, the float 212 descends and the needle valve 211 is opened, and the fuel F
Is replenished. In this way, the liquid level 214 is adjusted and held within the predetermined range in the liquid level adjusting chamber 21.

Next, the elastic pipe 31 will be described.
The pipe joints 321 and 331 made of metal in both the pipe joint portions 32 and 33 described above are attached to the cap nuts 322 and 33.
2 are fixed to the fuel discharge part 17 and the filter chamber inlet 22b, respectively. Furthermore, at both ends of the elastic pipe 31,
Using the fittings 323 and 333, the above-mentioned pipe fitting 3
It is fixed to 21, 331.

The flow of fuel discharged from the electromagnetic pump is
Due to the reciprocating motion of the electromagnetic plunger, half of the period does not flow,
It becomes a pulsating flow. That is, in the electromagnetic pump, the displacement change amount when the plunger reciprocates becomes the discharge amount, and the pulsating pressure that fluctuates with each cycle of the pulse is generated. As in the circuit, a sufficient capacitive component is needed.

According to the present invention, a part of the pipe path 3 connecting the electromagnetic pump 1 and the liquid level adjusting device 2 is made of an elastic body pipe 31 made of an elastic body, so that the elastic body pipe 31 is made to have a capacity component. Can be regarded as, and a large effect of smoothing the pulsating flow can be obtained. That is, when the plunger moves upward, the elastic pipe expands and accumulates pressure, and when the plunger moves downward, the elastic pipe contracts to its original state and releases the accumulated pressure. In other words, pressure fluctuations are accepted as volume fluctuations.
In the configuration of the present invention, since the elastic pipe 31 can be provided over a long section, a large possible capacity change amount can be obtained, and a sufficient smoothing effect can be obtained.

The elastic pipe 31 may be made of any material as long as it has elasticity and is not deteriorated by the fuel liquid petroleum or kerosene, and rubber containing a base cloth is preferable. Also,
In FIG. 1 showing the first embodiment, the elastic pipe 3 is provided over the entire section of the pipe path 3 from the pipe joint 32 of the electromagnetic pump 1 to the inflow pipe joint 33 of the liquid level adjusting device 2.
However, it is also possible to perform piping using a normal copper pipe for most of this section, and to use a part of the section as elastic piping as required.

FIG. 2 shows the structure of the electromagnetic pump of the liquid supply apparatus according to the second embodiment. The electromagnetic pump 1 is composed of an electromagnetic pump main body part, which will be described later, and an accumulator 4 built in the electromagnetic pump main body part. The configuration of the electromagnetic plunger type electromagnetic pump main body described below has a configuration equivalent to that proposed by the present applicant (Japanese Patent Application No. 2000-228565).

The main body of the electromagnetic pump is a cylindrical cylinder 1.
2, an electromagnetic plunger 13 which is mounted inside the cylinder 12 and which is swingable in the axial direction while being supported by a biasing means (first coil spring 122 described later), and inside the plunger 13. A cylindrical valve body 14, an electromagnetic coil 15 provided around the cylinder 12, a fuel suction portion 16 connected to a lower end portion of the cylinder 12, a fuel discharge portion 17 connected to an upper end portion of the cylinder 12, and a fuel. A check valve 173 built in the discharge part 17 and a shut-off valve 18 attached to one upper end of the cylinder 12 for preventing fuel from flowing through the cylinder 12 when the driving is stopped. Has been done.

The electromagnetic coil 15 is formed by winding a predetermined wire around a coil bobbin 151 made of a cylindrical non-magnetic material. The coil bobbin 151 has an annular gap formed between the coil bobbin 151 and the cylinder 12.

A cylindrical upper magnetic body 152 is fitted from above and a cylindrical lower magnetic body 153 is fitted from below into the annular gap to form a magnetic path inside the cylinder 12. ing. As a result, the biasing means (first
The plunger 1 is resisted against the biasing force of the coil spring 122).
A strong magnetic flux that moves 3 down is generated. Further, a yoke 154 made of a magnetic material having a U-shape in a side view is externally fitted to each of the magnetic bodies 152 and 153. The yoke 154 forms an external magnetic path and plays a role as a constituent material of the electromagnetic pump 1. The terminal block 155 is provided above the coil bobbin 151.
Both ends of the coil wire are connected to the terminal block 155, and the electromagnetic coil 15 is excited intermittently by turning on a power switch (not shown).

The fuel suction section 16 is a first suction cylinder 161 fitted and connected to the lower end of the cylinder 12, and a second suction cylinder 1 fitted and connected to the first suction cylinder 161.
62 and a bottomed cylindrical filter cylinder 163 which is externally fitted and connected to the lower end of the first suction cylinder 161 in the second suction cylinder 162. Also, the first
At the center of the suction cylinder 161, a fuel suction hole 161e, which penetrates in the vertical direction and is concentric with the cylinder 12, is formed. The second suction cylinder 162 is provided with a fuel suction hole 162e which is concentric with the first suction cylinder 161 and which vertically penetrates.

The fuel discharge part 17 has a fuel discharge cylinder 171 connected to the upper end of the cylinder 12, a valve receiving cylinder 172 installed in the fuel discharge cylinder 171, and a valve receiving cylinder 172.
Of the cylindrical check valve 173 mounted on the
A second coil spring 174 for urging the valve 3 in the valve closing direction and a packing 175 made of an elastic material such as rubber laminated on the lower end portion of the valve receiving cylinder 172 are configured.

The fuel discharge cylinder 171 is provided with a male screw for screwing a cap nut for connecting the discharge side pipe member and a fuel discharge hole 171f. A fuel passage hole 172a that is concentric with the cylinder 12 is formed in the bottom of the valve receiving cylinder 172. Then, the second coil spring 174 is fitted and inserted into the fuel discharge hole 171f, and the check valve 173 pressed by the urging force of the second coil spring 174 closes the fuel passage hole 172a. It is designed to be installed in the inside of 171.

The packing 175 is a fuel discharge cylinder 171.
The thickness dimension is set so that the upper edge portion of the cylinder 12 is pressed against and in contact with the lower surface of the packing 175 in a state in which the cylinder 12 is screwed to the cylinder 12, whereby the inside of the cylinder 12 is reliably sealed. The packing 175 is provided with a fuel passage hole 175a which is concentric with the fuel passage hole 172a of the valve receiving cylinder 172 and has substantially the same diameter.

Next, the plunger 13 and the shutoff valve 18 will be described. The length dimension of the plunger 13 is set to be slightly longer than half the length dimension of the cylinder 12, and the outer dimension is set to be slightly smaller than the inner diameter dimension of the cylinder 12. It has a so-called free piston function in which it can move up and down smoothly and the stroke length changes according to the load.

The plunger 13 is provided with a valve body mounting chamber 131 having a circular shape in a plan sectional view, which is recessed at the axial center position of the lower half so as to extend in the vertical direction, and has a valve body mounting chamber in the lower half. A fuel suction hole 132 having a diameter smaller than that of 131 is formed concentrically. The stop valve 18 is the valve body mounting chamber 13
It is press-fitted into the upper opening of No. 1 and fixed to the plunger 13. The cylindrical valve body 14 is installed in the valve body mounting chamber 131 of the plunger 13 and has a diameter slightly smaller than the inner diameter of the valve body mounting chamber 131 so that the liquid fuel can be circulated. .

A third coil spring 133 is housed inside the valve body mounting chamber 131 in a compressed state. Normally, the cylindrical valve body 14 is pressed against the third coil spring 133 to be in close contact with the bottom of the valve body mounting chamber 131, whereby the fuel suction hole 132 is closed. Further, a first coil spring 122 is installed inside the cylinder 12. The first coil spring 122 is interposed in a compressed state between the bottom portion of the plunger 13 and the first suction cylinder 161, and thus normally pushes the plunger 13 upward so that the stop valve 18 seals the packing. It is designed to stop at 175.

The shut-off valve 18 has a circular valve body 181 whose outer dimensions are slightly larger than the inner diameter of the valve body mounting chamber 131 of the plunger 13, and a T-shape in a side sectional view formed in the valve body 181. And a T-shaped flow path 183. Then, the shutoff valve 18 is integrally fixed to the plunger 13 by press-fitting the valve body 181 into the valve body mounting chamber 131. Then, the valve body mounting chamber 131, the T-shaped flow path 183, and the cylinder 12
A space above the plunger 13 inside forms a pump chamber 120 for sucking and discharging the liquid fuel by the vertical movement of the plunger 13.

The biasing force of the first coil spring 122 is appropriately set so that the biasing force pushes the plunger 13 upwards when no current is being supplied to the electromagnetic coil 15. The lower opening of the fuel passage hole 172a is closed by the abutment of the upper surface of the shutoff valve 18 to the packing 175 by this, while
In the state where the current is supplied to, the plunger 13 is moved downward by the magnetic field formed between the magnetic bodies 152 and 153, and the fuel passage hole 172a is opened.

In addition to the above-described operation, the first coil spring 122 has a cylinder in a stroke range in which the closing valve 18 does not come into contact with the packing 175 while a predetermined drive pulse signal is supplied to the electromagnetic coil 15. The biasing force is set so as to move up and down within 12 in a vibrational manner. Further, the third coil spring 133 causes the pump chamber 1 to move by the downward movement of the plunger 13 due to the supply of the drive pulse signal to the electromagnetic coil 15.
When the pressure inside 20 is reduced, the biasing force is set so as to allow the upward movement of the cylindrical valve body 14 in the valve body mounting chamber 131.

Further, in this embodiment, the cylinder 1
2 has an inner diameter of 8.00 mm, while the plunger 13 has an outer dimension of 7.94 mm, which allows the inner peripheral surface of the cylinder 12 and the plunger to be positioned concentrically. An annular gap having a radial gap size of approximately 30 μm is formed between the outer circumferential surface of the ring 13 and the outer circumferential surface of the ring 13.

On the outer peripheral surface of the plunger 13, a plurality of labyrinth grooves 136 each having a triangular cross section are provided as annular grooves. The labyrinth groove 136 is provided between the inner peripheral surface of the cylinder 12 and the outer peripheral surface of the plunger 13 by 30
This is to prevent air from leaking from the gap even when a gap of μm or more is formed.

That is, the electromagnetic pump 1 of the present invention is used for pumping up liquid fuel, and the electromagnetic pump 1 is of a so-called minus head, which is provided at a considerably higher level with respect to the liquid level in the fuel tank. In this case, in the early stage of driving the electromagnetic pump 1, the air in the pipe connecting the fuel tank and the electromagnetic pump 1 is sucked by the electromagnetic pump 1 to make the inside of the pipe a negative pressure, and the liquid fuel in the fuel tank is once transferred into the cylinder 12. Need to pump up.

However, the viscosity of air is much lower than that of liquid fuel, and the air leaks from the annular gap between the cylinder 12 and the plunger 13, so that the liquid fuel in the fuel tank is not sucked into the pump chamber 120. So usually
Although priming oil is filled by priming the pipe with liquid fuel, this operation is very troublesome. In order to eliminate such an inconvenience, by providing such a labyrinth groove 136, the air in the laminar flow state that has leaked into the annular gap between the cylinder 12 and the plunger 13 becomes a turbulent flow state, and the resulting pressure The increased loss reduces the amount of air that leaks into the annular gap. Therefore, when the plunger 13 is lowered, the degree of vacuum in the pump chamber 120 is improved, while when the plunger 13 is raised, the degree of compression in the pump chamber 120 is increased, and the liquid fuel in the fuel tank is not primed. It will be pumped up to the pump 1.

According to the electromagnetic pump 1 of this embodiment, when the driving pulse signal (pulse current) to the electromagnetic coil 15 excites the electromagnetic coil 15 to generate a magnetic flux between the magnetic bodies 152 and 153, the plunger 13 is magnetically driven. The stop valve 18 receives the suction force and resists the urging force of the first coil spring 122.
Is lowered from the state of being in contact with the packing 175, the vacuum state appears in the pump chamber 120 due to the increase in the volume of the pump chamber 120 at this time, and the fuel suction hole 132 of the plunger 13 with the cylindrical valve body 14 as a boundary. Side and pump chamber 12
Since the pressure balance with the 0 side is lost and the pressure on the fuel suction hole 132 side becomes higher than that in the pump chamber 120, the cylindrical valve body 14
Is pushed by the liquid fuel in the fuel suction hole 132, rises in the valve body mounting chamber 131 against the biasing force of the third coil spring 133, and the valve closed state is eliminated. Suctioned into 120.

On the other hand, when the magnetic flux between the magnetic bodies 152 and 153 disappears due to the demagnetization of the electromagnetic coil 15 during the pulse rest period of the pulse drive signal, the urging force of the first coil spring 122 pushes the plunger 13 upward. ,
The liquid fuel in the pump chamber 120 presses the check valve 173 upward, and the liquid fuel is discharged from the fuel discharge hole 171f by the opening of the check valve 173 against the biasing force of the second coil spring 174. To be done.

When the supply of the pulse drive signal to the electromagnetic coil 15 is stopped, the plunger 13 is moved upward by the urging force of the first coil spring 122, whereby the closing valve 18 comes into contact with the packing 175 and the closing valve 18 is closed. In order to close the hole of the packing 175 on the upper surface of 18, the fuel discharge hole 171
Since the communication state between the inside of f and the inside of the pump chamber 120 is double-closed by the check valve 173 and the closing valve 18, the inside of the fuel discharge hole 171f and the inside of the pump chamber 120 are closed. It is possible to reliably prevent the liquid fuel from flowing.

Since the urging structure for urging the plunger 13 employs a so-called single spring urging system using only the first coil spring 122, the conventional structure in which the plunger 13 is clamped by the upper and lower coil springs is used. The plunger 13 in the cylinder 12 is
Since it is not necessary to secure a space for mounting the coil spring on the upper portion, the capacity of the pump chamber 120 can be reduced.

Therefore, if the stroke amounts of the plungers 13 are the same, it becomes possible to increase the capacity ratio, which is the ratio of the minimum capacity to the maximum capacity of the pump chamber 120, as compared with the conventional case, and the pump is correspondingly increased. Since the compression ratio when the air is present in the chamber 120 (the discharge force of the liquid fuel when the pump chamber 120 is filled with the liquid fuel) can be increased, the electromagnetic pump 1 is initially driven. Not only can liquid fuel be pumped from the fuel tank without priming, but also when the fuel tank is provided at a level lower than the electromagnetic pump 1, or in addition to this, the fuel tank and the electromagnetic pump 1 Even if the length of the pipe connecting the two is long, the liquid fuel can be pumped up with a stronger suction force.

The above is the configuration of the electromagnetic pump main body. Next, the accumulator 4 built in the electromagnetic pump body will be described.

The fuel discharge cylinder 171 is formed by shaving a hexagonal bar. A through lateral hole 41 is formed on the side surface facing the one side of the above-described hexagon facing the fuel discharge hole 171f which is a liquid flow path in the axial direction of the fuel discharge cylinder 171. The through lateral hole 41 has a step, and the central side of the fuel discharge cylinder 171 is a small simple hole, and the external side is a larger hole with a female thread cut, and the accumulator 4 is built in the outside step portion. Has been done. The accumulator 4 is constructed by fixing an elastic diaphragm 42 made of rubber with a base cloth and having a diameter of 8 mm and a thickness of 2 mm by means of a diaphragm retainer 43 which is a male screw using the above-mentioned female screw. A recess is provided on the diaphragm side of the diaphragm retainer 43. When the elastic diaphragm 42 is pressed and fixed, a side chamber 44 is formed which serves as a space having an accumulator function, that is, a function of absorbing pressure fluctuation.

The accumulator 4 having the side chambers 44 separated by the elastic diaphragm 42 according to the present invention includes the fuel discharge cylinder 17
It fits within one side of the hexagonal column material, which is the first material. In addition, as shown in FIG. 2, the accumulator 4 includes a fuel discharge cylinder 17
There is no protrusion from the outer circumference of No. 1 and it is embedded and built in. For this reason, when mounting the electromagnetic pump 1 at a predetermined place,
Although it does not have a built-in accumulator, it has the advantage that it can be installed using conventional installation locations and installation methods. It has been confirmed that the vibration of the float is prevented by the electromagnetic pump 1 including one accumulator 4 of the present invention. The accumulator 4 can be built in one fuel discharge cylinder 171 up to every other surface of the hexagonal material, and a larger effect can be obtained by housing a plurality of accumulators. The above points also apply to other embodiments described later.

FIG. 3 shows the structure of the electromagnetic pump of the liquid supply apparatus according to the third embodiment. Electromagnetic pump 1 of the present embodiment
A is an accumulator 4A in the electromagnetic pump body described later.
It is configured to be attached externally.

The electromagnetic pump body of the electromagnetic pump 1A is shown in FIG.
The structure of the fuel discharge cylinder 171 is different from the main body of the electromagnetic pump 1 shown in FIG. In the present embodiment, the fuel discharge cylinder 1
71 is formed with a through lateral hole 41a facing the fuel discharge hole 171f, and a through lateral hole 41 having a stepped screw portion is formed on the side surface of the cap nut 322 facing the through lateral hole 41a to hold down the accumulator 4A with a diaphragm. It is fixedly attached at 43. Side chamber 4 separated by an elastic diaphragm 42 made of an elastic material
The accumulator 4A having 4 has the same structure as the accumulator 4 in FIG. The fuel discharge cylinder 171 and the pipe joint 321 are connected to each other by sandwiching the end portion of the pipe, which is so-called flare-processed, with a portion of which the diameter is enlarged by the cap nut 322 as usual, but in the present invention, the end portion of the cap nut 322 is further connected. An O-ring 324 is provided between the fuel discharge cylinders 171 to provide a closed space.

In the present embodiment, since the conventional electromagnetic pump can be built in the cap nut which is an external component to be attached when performing on-site construction, the conventional electromagnetic pump has the through lateral hole 41a added to the fuel discharge cylinder 171. The accumulator 4A can be attached only by work.

FIG. 4 shows the structure of the electromagnetic pump of the liquid supply apparatus according to the fourth embodiment. Electromagnetic pump 1 of the present embodiment
B is the second fuel discharge cylinder 1 in the electromagnetic pump body described later.
71a is externally attached to the second fuel discharge cylinder 171a,
It has a configuration in which an accumulator 4B is built in. The electromagnetic pump main body of the electromagnetic pump 1B has the same structure as that of the electromagnetic pump 1 shown in FIG. 2, which does not include an accumulator.

In this embodiment, the second fuel discharge cylinder 171 is used.
a is inserted between the cap nut 322 and the pipe joint 321 and the fuel discharge cylinder 171.
An O-ring 324 is provided between 1a and the fuel discharge cylinder 171 for sealing. Then, the second fuel discharge cylinder 171
2a, the fuel discharge cylinder 171 in the second embodiment of FIG.
The accumulator 4B is incorporated in the same manner as the accumulator 4 incorporated in the. Further, in the present embodiment, the second fuel discharge cylinder 171a having the built-in accumulator 4B.
By using a conventional electromagnetic pump (Japanese Patent Application No. 2000-2285).
65) has the advantage that it can be used as it is without processing.

FIG. 5 shows the structure of the liquid level adjusting device 2 of the liquid supply device according to the fifth embodiment. Accumulators 4C and 4D having side chambers separated by a diaphragm made of an elastic body are externally attached to and built in the liquid level adjusting device 2.

First, the structure in which the accumulator 4C is externally attached will be described. In the present embodiment, the second cap nut 32a is inserted between the inflow pipe joint portion 33 and the filter chamber inlet 22b. Second cap nut 332
Between the a and the filter chamber inlet 22b, there is an O for sealing.
A ring 334 is provided. Second cap nut 332a
In the same manner as the accumulator 4C in the second embodiment shown in FIG. 2, the accumulator 4C is incorporated in the through lateral hole 41 portion provided facing the piping path. Next, the accumulator 4D
This is an example of a case where an accumulator is built in the liquid level adjusting device 2, and it is installed so as to face the filter chamber 22 located below the needle valve 211.

According to this embodiment, the accumulator 4C
Can be attached to the conventional liquid level adjusting device by using the second cap nut 332a without any design change. In addition, the accumulator 4D is the needle valve 2
It is effective because it is provided in the vicinity of 11.

6 and 7 show the structure of the electromagnetic pump of the liquid supply apparatus according to the sixth embodiment. The electromagnetic pump 1C of the present embodiment has a configuration in which the gas damper 5 is built in the fuel discharge cylinder 171 of the electromagnetic pump main body.

The electromagnetic pump 1C according to the present embodiment uses the discharge portion structure itself of the pump instead of the accumulator 4 using the elastic diaphragm provided in the electromagnetic pump 1 of the second embodiment shown in FIG. The gas damper is configured so that an operation equivalent to that provided with the same accumulator can be obtained. The fuel discharge hole 171f inside the fuel discharge cylinder 171 is enlarged, and the fuel discharge hole 171 is airtightly coupled to the upper end of the fuel discharge cylinder 171.
A fuel delivery pipe 52 is provided so as to hang inward. As a result, the enlarged space of the fuel discharge hole 171f becomes the damper chamber 51, and the damper chamber 51 and the fuel delivery pipe 52 constitute the built-in type gas damper 5. Further, the check valve 173 is a check valve seat 1 made of a flat plate portion.
The check valve 173 is located in a space surrounded by the check valve case 172b and the check valve case 172b. The check valve 173 is directed toward the check valve seat 172a by a second coil spring 174 having one end supported by an upper flange portion of the check valve case 172b. Is being urged. During operation of the electromagnetic pump 1C, as shown in FIG. 7, the gas 53 stays in the upper space of the damper chamber 51, the fuel F stays in the lower space, and the fuel delivery pipe 52 is located below the interface between the two.
The lower end surface of is located. Under these circumstances, when the plunger of the electromagnetic pump moves upward, the peak value of the discharge pressure is absorbed by the gas 53 in the gas damper 5 contracting (accumulating), and the fuel is stored in the space formed by the contraction. When the fuel is accumulated and the plunger moves downward, the check valve 173 is closed, and the accumulated gas 53 is expanded, so that the accumulated fuel is discharged to the pipe outside the pump. Thus, the fuel delivery pipe 52 provided in the fuel discharge hole 171f
The pressure fluctuation of the fuel discharged from is not the pressure fluctuation of the fuel passing through the check valve 173 with the operation of the electromagnetic pump 1C but the pressure fluctuation smoothed by the gas damper 5 (effect of the accumulator). ing. In the liquid supply device according to the present embodiment, the pressure fluctuation of the pipe path leading to the liquid level adjusting device causes the gas damper 5 provided in the electromagnetic pump.
The liquid supply device is suppressed by.

As described above, the gas damper 5 utilizes the compressibility of the gas to absorb and smooth the pulsation of the fuel discharge pressure, and the gas needs to stay in the damper chamber 51. is there. When the pumping pump is installed, the air existing in the suction pipe is sucked and discharged to the discharge side of the pump as the pump is driven. When the pump is further driven, the inside of the pipe becomes a negative pressure, the liquid fuel in the fuel tank is sucked, and the pump and the pipe are filled with the fuel. At this time, in the damper chamber 51 of the gas damper 5, the lower end of the fuel delivery pipe 52 is lower than the ceiling of the damper chamber 51, so that air is retained in the upper portion of the damper chamber structurally. The amount of the staying gas 53 depends on the outflow speed at which the air dissolves in the fuel and flows out, and the air supply speed due to the bubbles generated due to the cavitation due to the negative pressure during the driving of the pump and the air bubbles brought from the fuel tank. Determined by balance.
With respect to this point, it has been confirmed from the long-term operation results according to the present embodiment that the gas 53 required as the gas damper is maintained and the practicality of the gas damper 5 is confirmed.

FIG. 8 shows a modification of the sixth embodiment, and in this electromagnetic pump, in order to efficiently secure the bubbles brought in by the fuel flowing into the damper chamber 51, the check valve case 172b is provided. The fuel path from the inside to the damper chamber is configured to pass through the opening Q provided on the side of the check valve case 172b. In this example, the check valve case 1
Since the direction in which the fuel is discharged from 72b does not face the opening of the fuel delivery pipe 52, the gas that has dissolved in the fuel is trapped in the upper portion of the damper chamber 51 and remains in the gas 53.
The probability of becoming is high.

FIG. 9 shows the structure of the gas damper portion of the electromagnetic pump of the liquid supply apparatus according to the seventh embodiment. The electromagnetic pump of this embodiment has a structure in which a gas damper 5A is externally attached instead of using the accumulator 4 having an elastic diaphragm. The gas damper 5A is externally attached by inserting the gas damper joint 50 having the gas damper 5A between the fuel discharge cylinder 171 of the electromagnetic pump body, the cap nut 322, and the pipe joint 321. The fuel discharge cylinder 171 and the gas damper joint 50 are sealed and connected via an O-ring 324. In such a gas damper 5A, since the damper chamber 51 can be made larger than the built-in gas damper described above, the pressure fluctuation of the discharged fuel can be suppressed more efficiently.

Next, the effect of the gas damper 5 according to the sixth embodiment described above will be described with reference to FIG. FIG. 10 shows a flow rate fluctuation measurement value a in the case of using the gas damper of the present embodiment and a flow rate fluctuation measurement value b in the case of using the conventional gas damper. When the gas damper 5 is used, pressure fluctuation is suppressed and noise during pump operation is suppressed. Further, as can be seen from FIG. 10, regarding the flow rate of the fuel assembled from the fuel tank to the liquid level adjusting device,
It has the effect of stabilizing and increasing the flow rate itself. According to this measurement result, in the conventional measured value b without a gas damper, the flow rate fluctuation is 40 cc / min, and the average flow rate is 50 cc / min, whereas in the measured value a with a gas damper of the present embodiment, Flow rate fluctuation is 10cc
/ Min, the average flow rate is 100 cc / min. Thus, by using the gas damper, the fuel pumping performance of the electromagnetic pump is improved in both quality and quantity.

[0073]

As described above, according to the first aspect of the invention, the electromagnetic valve having the stop valve and the check valve for stopping the inflow or discharge of the liquid into the pump body in the state where the driving is stopped. Since at least a part of the piping path connecting the pump main body and the liquid level adjusting device is made of an elastic body, there is no backflow of liquid fuel in the electromagnetic pump, and the pulsation of the discharge liquid supplied to the liquid level adjusting device. Can be smoothed. For example, by configuring a part of the piping path with a rubber tube that is an elastic body, the pulse pressure fluctuation of the discharge liquid in the piping path is absorbed by the expansion and contraction of the rubber tube, and is transmitted via the piping material. Vibration and vibration noise will be suppressed.

Further, since the pulsation of the discharged liquid is smoothed, fluctuations in external load pressure are suppressed, noise and vibration are suppressed and absorption, and the liquid supply device can operate stably.
Furthermore, by suppressing pulsation, the effective discharge flow rate can be improved, and the needle valve of the liquid level adjuster can be stably closed and held even when the electromagnetic pump is driven, so the conventional oil leveler can also be used. In addition, it is possible to realize a fuel liquid supply device of a pumping relay system from an external fuel tank.

According to the second aspect of the present invention, since the gas damper for retaining and retaining the gas that accumulates the liquid pressure due to the contractility is built in or attached externally to the electromagnetic pump, the pulsation is smoothed, and the vibration and Vibration noise can be suppressed. In addition, when the gas damper of the present method is built in or attached externally, it is possible to perform the construction easily and at a low cost with minimal processing on the conventional electromagnetic pump or without processing.

According to the third aspect of the invention, since the accumulator having the side chamber separated by the elastic diaphragm is built in or attached to the electromagnetic pump, the pulsation is smoothed and the vibration and the vibration noise are suppressed. You can In addition, when installing the accumulator of this method internally or externally,
It is possible to easily carry out the construction with a minimum cost for a conventional electromagnetic pump, or at low cost without any processing.

According to the invention of claim 4, since the accumulator having the side chambers separated by the elastic diaphragm is built in or externally attached to the liquid level adjusting device, the same effect as that of claim 2 can be obtained. Further, when the accumulator of this system is externally attached to the conventional liquid level adjusting device, it can be implemented at low cost.

[Brief description of drawings]

FIG. 1 is a sectional view showing an overall configuration of a liquid supply apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an electromagnetic pump including an accumulator according to a second embodiment of the present invention.

FIG. 3 is a sectional view of an electromagnetic pump to which an accumulator according to a third embodiment of the present invention is externally attached.

FIG. 4 is a sectional view of an electromagnetic pump to which an accumulator according to a fourth embodiment of the present invention is externally attached.

FIG. 5 is a cross-sectional view of a liquid level adjusting device that externally and internally has an accumulator according to a fifth embodiment of the present invention.

FIG. 6 is a sectional view of an electromagnetic pump including a gas damper according to a sixth embodiment of the present invention.

FIG. 7 is a detailed sectional view of the gas damper.

FIG. 8 is a sectional view showing a modified example of the gas damper.

FIG. 9 is a partial cross-sectional view of an electromagnetic pump externally attached with a gas damper according to a seventh embodiment of the present invention.

FIG. 10 is a fluctuation diagram of the measured flow rate for explaining the effect of using the gas damper according to the present invention.

[Explanation of symbols]

1, 1A, 1B, 1C Electromagnetic pump 13 Electromagnetic plunger 173 Check valve 18 stop valve 2 Liquid level adjusting device 211 needle valve 212 float 214 Liquid level 3 piping system 31 Elastic piping 4,4A, 4B, 4C, 4D Accumulator 5, 5A gas damper

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3H069 AA06 BB02 CC04 DD31 DD32                       EE05 EE11                 3H071 AA07 BB01 CC21 CC25 DD14                       DD31 DD35 DD62 DD73                 3K068 AA15 BB17 BB18 CA16

Claims (4)

[Claims] 1. A liquid supply device comprising an electromagnetic pump for discharging liquid by reciprocating drive of an electromagnetic plunger toward a liquid level adjusting device for adjusting the liquid level to a predetermined value. At least one of the piping paths for connecting the electromagnetic pump main body and the liquid level adjusting device, which has a stop valve and a check valve for closing the inflow or discharge of the liquid into the pump main body while the driving is stopped. A liquid supply device characterized in that the part is made of an elastic body so as to be able to absorb the pulsation of the discharged liquid generated in the piping path by the reciprocating motion of the electromagnetic plunger. 2. A liquid supply device comprising an electromagnetic pump for discharging liquid by reciprocating drive of an electromagnetic plunger toward a liquid level adjusting device for adjusting the liquid level to a predetermined value. It has a stop valve and a check valve for closing the inflow or discharge of the liquid into the pump body in the state where the driving is stopped, and faces the piping path connecting the electromagnetic pump body and the liquid level adjusting device. A liquid supply device characterized in that a gas damper is built in or externally attached to the electromagnetic pump. 3. A liquid supply device comprising an electromagnetic pump for discharging liquid by reciprocating drive of an electromagnetic plunger toward a liquid level adjusting device for adjusting the liquid level to a predetermined value. It has a stop valve and a check valve for closing the inflow or discharge of the liquid into the pump body in the state where the driving is stopped, and faces the piping path connecting the electromagnetic pump body and the liquid level adjusting device. A liquid supply device, wherein an accumulator having side chambers separated by an elastic diaphragm is built in or attached to the electromagnetic pump. 4. A liquid supply device comprising an electromagnetic pump for discharging liquid by reciprocating drive of an electromagnetic plunger toward a liquid level adjusting device for adjusting the liquid level to a predetermined value. It has a stop valve and a check valve for closing the inflow or discharge of the liquid into the pump body in the state where the driving is stopped, and faces the piping path connecting the electromagnetic pump body and the liquid level adjusting device. A liquid supply device, wherein an accumulator having side chambers separated by an elastic diaphragm is built in or externally attached to the liquid level adjusting device.