JPH11135308A - Liquid resistor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact liquid resistor which has a simple structure, and moreover the liquid of which for dipping electrodes can be cooled easily and the load of which can be adjusted accurately. SOLUTION: A liquid resistor is constituted in such a way that the resistor is used by adjusting its load by controlling the dipping amount of a fixed electrode 13 in water by adjusting the surface level of the water with respect to the electrode 13. At the same time, the inside of a main body 12 of its tank is divided into two chambers arranged in parallel in the horizontal direction by providing a vertical partition 11. One chamber is used as an electrode tank 14, and the other chamber is used as a water tank 15. In addition, the temperature of the water in the electrode tank 14 is prevented from rising even when the resistor consumes electric power in such a way that the water is guided to the top of the tank 14 and showered in the tank 14 from the top and, at the same time, the water is cooled by blowing the outside air upon the shower water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid resistor as a load device for use in a measurement test of an output characteristic of a power supply device such as a generator, and more particularly, to reduce its size and improve its measurement accuracy. About technology.

[0002]

2. Description of the Related Art As a liquid resistor of this type, a liquid resistor as shown in FIG. 12 has been conventionally known. That is, this liquid resistor is provided with electrodes 1 to which three-phase high-voltage cables are respectively connected, and these electrodes 1 are suspended by installing a frame 3 in a water tank 2 to adjust the amount of immersion in water. The load is adjusted and used, and the output power of the generator is consumed by using the water in the water tank 2 as a resistance. This liquid resistor is of the movable electrode type.

The following two fixed electrode type liquid resistors are known for such a movable electrode type liquid resistor. That is, the liquid resistor disclosed in Japanese Patent Publication No. 1-44411 or the like has a cylindrical base electrode for storing a predetermined amount of water therein, and is adhered to the bottom center of the base electrode.
A cylindrical fixed electrode that stands vertically through the insulator and connects the output cable of the power supply to the lower end of the outside thereof, and is suspended so as to be able to move up and down to adjust the exposed length of the fixed electrode. And an insulated sheath.

Further, the liquid resistor disclosed in Japanese Utility Model Laid-Open No. 59-77201 discloses an electrode tank in which fixed electrodes are vertically arranged, a liquid tank for storing an electrolyte, an electrode tank and a liquid tank. It comprises an electrolytic solution circulating device that circulates the electrolytic solution between the tank and adjusts the level of the electrolytic solution in contact with the fixed electrode.

[0005]

However, the above-described conventional liquid resistors have the following problems. That is, the movable electrode type liquid resistor shown in FIG. 12 has a configuration in which the electrode 1 is suspended by installing the frame 3 in the water tank 2 and adjusting the load by adjusting the amount of immersion in water. Therefore, a large-sized hanging device 4 for the electrode 1 is required at the upper part of the water tank 2, and the entire device is increased in size, and a movable portion called the hanging device 4 for the electrode 1 is provided.
The device becomes complicated.

A fixed electrode type liquid resistor disclosed in Japanese Patent Publication No. 1-44431, etc., raises and lowers an insulating sheath tube covering the fixed electrode to adjust the exposed length of the main electrode. Since the configuration is such that the load is adjusted and used, an elevating / lowering device for the insulating sheath tube is required, and the entire device is increased in size, and the device is complicated because there is a movable part called the elevating / lowering device.

Further, the fixed electrode type liquid resistor disclosed in Japanese Utility Model Laid-Open No. 59-77201 and the like has a configuration in which the load is adjusted by adjusting the level of the electrolyte by circulating the electrolyte. This eliminates the need for a device for raising and lowering the electrode and raising and lowering the insulating sheath tube, and allows a configuration without a movable portion, thereby eliminating the disadvantages of the above two prior arts.

However, in this case, since the electrode tank is provided on the upper part of the liquid storage tank, there is a drawback that the entire apparatus becomes large due to an increase in the height of the entire apparatus. Further, in each of the above-mentioned liquid resistors, a cooling device for water or electrolyte is not provided, and the temperature of the water or electrolyte rises due to power consumption, and the electrical conductivity thereof changes. Adjustment becomes inaccurate, and the effect of consuming the output power of the generator with the water in the water tank as a resistance is not properly exhibited. Means such as a heat exchanger and a cooling tower are known as a liquid cooling device. However, when these are provided in a conventional liquid resistor, they are provided in a different installation form, which further promotes an increase in the size of the entire device. Problem arises.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, has a simple structure, is compact, and can easily cool a liquid in which an electrode is immersed. It is an object of the present invention to provide a liquid resistor that can accurately adjust the resistance.

[0010]

According to a first aspect of the present invention, there is provided a liquid resistor in which a vent body is opened at an upper part, and a tank body is divided into two chambers by a partition extending in a vertical direction. An electrode tank formed by one chamber in the tank main body, and a required number of fixed electrodes are vertically arranged, and a liquid storage tank formed by the other chamber in the tank main body to store liquid, A liquid circulation device that circulates liquid between the electrode tank and the liquid storage tank to adjust the level of the liquid that contacts each fixed electrode, and guides the liquid in the electrode tank to the upper part of the electrode tank, A liquid jetting device that makes a shower from the upper part of the electrode tank and jets the liquid toward the inside of the electrode tank, and a cooling blower that is provided on the tank body wall and blows external air to the shower liquid to cool the liquid. And is characterized by including.

[0011] The invention according to claim 2 is characterized in that it is configured to include a replenishing device for a liquid storage tank for replenishing liquid to the liquid storage tank.

The invention according to a third aspect is characterized in that the invention includes a replenishing device for an electrode tank for replenishing the electrode tank with a liquid.

The invention according to a fourth aspect is characterized in that a shielding plate is provided for shielding the opening at the upper end of the liquid storage tank so as to allow ventilation.

According to a fifth aspect of the present invention, in the liquid circulating device, the liquid circulation device includes a supply passage communicating between the bottom of the liquid storage tank and the bottom of the electrode tank.
A discharge passage communicating the bottom of the electrode tank and the bottom of the storage tank, a part of the supply passage and the part of the discharge passage are shared by a single passage, a circulation pump is interposed in the common passage, and In addition, a passage opening / closing means is interposed in each of an upstream portion and a downstream portion of the common passage of the supply passage and an upstream portion and a downstream portion of the common passage of the discharge passage.

According to a sixth aspect of the present invention, in the liquid ejecting apparatus, the ejecting liquid supply passage which communicates a bottom portion and an upper portion of the electrode tank, and has a passage portion extending substantially horizontally in the tank main body on the upper side thereof. A discharge liquid supply passage having a large number of discharge holes opened downward in the passage portion, and a suction pump is interposed in the passage.

The invention according to claim 7 is characterized in that a plurality of casters for movement are provided at the bottom of the tank main body.

The operation of the present invention will be described. In the invention according to claim 1, the liquid in the liquid storage tank flows into the electrode tank by the liquid circulation device, the electrode tank is filled with the liquid, and the liquid filled in the electrode tank is stored in the electrode tank. It flows into the liquid tank and is returned into the liquid storage tank. The liquid level in the liquid storage tank is adjusted by the flow of the liquid between the liquid storage tank and the electrode tank. The load is adjusted by adjusting the amount of electrode immersion in the liquid depending on the liquid level in the liquid storage tank. For example, when the load is adjusted to 0%, 25%, 50%, 75%, and 100%, the water level is adjusted to five levels from a low water level to a high water level.

On the other hand, the liquid in the electrode tank is jetted downward from the upper part of the electrode tank as a shower liquid through the jetted liquid supply passage by the liquid jetting device, and the outside air is introduced into the tank main body by the cooling blower. Then, the introduced outside air is blown against the shower liquid, and removes heat of evaporation from the shower water to cool the shower liquid. This heat of evaporation is released from the exhaust port of the tank body to the outside air. Therefore, the liquid in the electrode tank is cooled, the temperature of the liquid can be prevented from rising due to power consumption, the conductivity of the liquid can be kept substantially constant, and the load can be adjusted accurately.

In the invention according to claim 2, the liquid level in the liquid storage tank is kept constant by introducing the replenishing liquid into the liquid storage tank.

In the invention according to claim 3, the liquid level in the electrode tank is kept constant at a liquid level set according to the load by introducing the replenishing liquid into the liquid storage tank.

In the invention according to claim 4, the shower liquid ejected downward from the upper part of the electrode tank through the ejected liquid supply passage is prevented from flowing into the liquid storage tank by the shielding plate.

In the invention according to claim 5, the supply passage communicating the bottom of the liquid storage tank and the bottom of the electrode tank is opened, and the circulating pump is driven to supply the liquid from the liquid storage tank to the electrode tank. The liquid is returned from the electrode tank to the storage tank by opening the discharge passage communicating the tank bottom and the storage tank bottom and driving the circulation pump.

In the invention according to claim 6, the liquid in the electrode tank passes through the jet liquid supply passage to a passage portion extending substantially horizontally in the tank main body, and downwardly from a large number of ejection holes provided in this passage portion. Is ejected as a shower liquid.

[0024] In the invention according to claim 7, the tank main body can be freely moved by a plurality of moving casters provided at the bottom thereof.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the attached drawings. FIG. 1 is a schematic view showing a schematic structure of a water resistor as one embodiment of a liquid resistor according to the present invention. FIGS. 2 to 4 are front views and plan views showing specific structures of the water resistor. And a side view. In these figures,
The water resistor is formed by a tank main body 12 divided into two chambers by a partition 11 having an exhaust opening 10 opened at an upper portion and having a vertically extending inside, and one chamber in the tank main body 12,
Electrode tank 14 in which required number of fixed electrodes 13 are vertically arranged
And a water storage tank 15 formed by the other chamber in the tank main body 12 and storing water as a liquid, and water is circulated between the electrode tank 14 and the water storage tank 15 so that each fixed electrode A water circulating device as a liquid circulating device for adjusting the level of water contacting with the electrode tank; water in the electrode tank 14 being guided to the upper part of the electrode tank 14;
A water jetting device as a liquid jetting device for jetting the liquid into the inside 4; a cooling air blowing device provided on the wall of the tank main body 12 to blow external air to the shower water to cool the water;
A water tank rehydration device as a water tank refilling device for refilling the water tank 15, and an electrode tank rehydration device as an electrode tank refill device for refilling the electrode tank 14 with water. Is done.

The tank body 12 is formed in a rectangular box shape, and the partition wall 11 extends upward from a substantially middle position in the width direction of the inner bottom surface of the tank body 12 to a substantially middle position in the height direction.
It is bent substantially horizontally in the horizontal direction and extends to a position at a predetermined interval on one side wall. The portion extending in the lateral direction is a shielding plate 11A that allows the upper end opening of the liquid storage tank 15 to be ventilated.
Is composed.

The exhaust port 10 is provided at a position on the upper wall of the tank body 12 directly above the electrode tank 14, and the exhaust duct 16 (which is detachably attached to the exhaust port 10). (See FIG. 5). in this case,
The air discharge opening 10 is connected to a mounting tubular portion 10A having a mounting flange portion 10a formed on the outer peripheral portion, while the air discharge duct 16 has a lower end portion and a side end portion as shown in FIG. It is formed of an open elbow-shaped cylinder, and has a mounting flange 16a formed on the outer peripheral portion at the lower end.

Then, with the lower end of the air discharge duct 16 inserted into the mounting cylinder 10A, the two mounting flanges 10
a, 16a, the exhaust duct 16
Can be attached to the exhaust port 10. The air discharge duct 16 can selectively change the air discharge direction to a plurality by changing the mounting direction of the mounting tube portion 10A.

A caster 17 for traveling is fixedly attached to each of the four corners on the bottom surface of the tank body 12. Further, on the outer wall of the tank body 12, a water level gauge 18 and an electrode tank 1 in a water storage tank 15 each formed of a pipe are provided.
4 and a water level gauge 19 in each of them.
The fixed electrode 13 includes three output electrodes and one ground electrode.

Each electrode 13 is, as shown in FIG.
S. 304 is made of a plate member formed of a material,
Through holes 1 in the upper, middle and lower parts, respectively, arranged side by side
3a are opened three by three. Such electrodes 13 are arranged side by side at predetermined intervals so that the plate surfaces are parallel to each other,
The support rod members 20 (see FIG. 7) are connected and supported.

As shown in FIG. 8, the support rod member 20 is a pipe member 20 made of vinyl chloride having a double inner / outer structure.
A and a flange member 20B disposed on both outer surfaces of both ends of the pipe member 20A. Are integrated.

The support rod member 20 is penetrated through each through hole 13a corresponding to the lateral direction of the electrodes 13 arranged in parallel. At the upper end of each electrode 13, as shown in FIG.
Connection conductors for grounding and connection conductors 21 for each phase
A to 21D are connected.

A terminal box 22 having a built-in output terminal block and a ground terminal is attached to the outer surface of one side wall of the tank body 12, and connection conductors extending from the output terminal block and the ground terminal are provided in the electrode bath 14. It is inserted into the upper part, and the vertically arranged electrode 13 is connected to the insertion end of the connection conductor, and is supported in a suspended state.

The water circulating device includes a supply pipe 2 serving as a supply passage connecting the bottom of the water storage tank 15 and the bottom of the electrode tank 14.
3A, 23B, and discharge pipes 24A, 24B as discharge passages connecting the bottom of the electrode tank 14 and the bottom of the water storage tank 15
And supply pipes 23A and 23B and discharge pipe 2
4A and 24B are shared by a single pipe 23C, a load control line pump 26 as a circulating pump is interposed in the shared pipe 25, and a supply pipe 23 is provided.
The electromagnetic valves 27A and 27B and the electromagnetic valves 28A and 28B as passage opening / closing devices are interposed in A and 23B and the discharge pipes 24A and 24B respectively.

The water jetting device is a jetted water supply pipe 28 as a jetted water supply passage connecting the bottom and the upper part of the electrode tank 14, and a pipe part extending substantially horizontally into the tank body 12 on the upper side thereof. 28A, a jet line supply pipe 28 having a large number of jet holes 28a opened downward in the pipe section 28A, and a cooling line pump 29 as a suction pump is interposed in the pipe 28. It consists of.

The cooling blower is composed of a ventilation fan 30 mounted on an opening formed in the upper part of the side wall of the tank body 12 on the water storage tank 15 side.
0A and a fan 30B disposed inside the wind tunnel 30A.
And a drive motor 30C for the fan 30B.

The water tank rehydration device and the electrode tank rehydration device are connected to a water supply source (not shown), and are provided with a water refill pipe 31 provided with a water refill pump (not shown). And the two branch pipes 31A, 31
B is connected to the water storage tank 15 and the electrode tank 14, respectively, and each of the branch pipes 31A and 31B is provided with a manual valve 32 and an electromagnetic valve 33 as opening and closing devices, respectively. 2 and 4, the unexplained reference numeral 34 is an overflow port, 35 is a control box, and 36 is a drain port.

FIG. 10 shows the two pumps 26 and 2 described above.
9, the drive motors 26A, 29A, the fan drive motor 30C of the ventilation fan 30, the four electromagnetic valves 27A, 27
B, 28A, 28B, wiring diagram for three-phase AC power supply,
FIG. 11 is a circuit diagram showing two pumps 26 and 29.
The drive motors 26A and 29A are turned on and off by switches 36 and 37, respectively, and the fan drive motor 30C of the ventilation fan 30 is turned on and off by a switch 38, respectively, and the four electromagnetic valves 27A, 27B, 28A, 2
8B is turned on and off by switches 39 and 40, respectively.

Next, the operation of the water resistor having such a configuration will be described together with its method of use. The water in the water storage tank 15 opens the electromagnetic valves 27A and 27B, and opens the electromagnetic valves 28A and 28B.
Is closed, and the pump 26 is driven to flow into the electrode tank 14 via the supply pipes 23A and 23B, and the electrode tank 14 is filled with water. Water filled in the electrode tank 14 opens the electromagnetic valves 28A and 28B,
When the electromagnetic valves 27A and 27B are closed and the pump 26 is driven, it flows into the water storage tank 15 via the discharge pipes 24A and 24B, and is returned to the water storage tank 15.

The water level in the water storage tank 15 is adjusted by the flow of water between the water storage tank 15 and the electrode tank 14. Depending on the water level in the water storage tank 15, the amount of the electrode 13 immersed in the water is adjusted to adjust the load. For example, load 0
When adjusting to%, 25%, 50%, 75%, and 100%, respectively, the water level is adjusted to five levels from a low water level to a high water level.

On the other hand, by driving the pump 29,
The water in the electrode tank 14 is discharged through the jet water supply pipe 28.
It reaches a pipe portion 28A extending substantially horizontally in the tank body 12,
While the shower water is jetted downward from a large number of jet holes 28a provided in the pipe portion 28A, the ventilation fan 3
By the drive of 0, outside air is introduced into the tank main body 12, and the introduced outside air is blown to the shower water, and the shower water is cooled by removing heat of evaporation from the shower water. This heat of evaporation is released from the exhaust port 10 to the outside air.

Accordingly, the water in the electrode tank 14 is cooled, the temperature of the water can be prevented from rising due to power consumption, the conductivity of the water can be kept substantially constant, and the load adjustment can be performed accurately. Become. As a result, the action of consuming the output power of the generator using the water in the electrode tank 14 as a resistance can always be properly exerted.

Further, the water level in the water storage tank 15 is kept constant by introducing makeup water into the water storage tank 15 by opening and closing the manual valve 32. Also, the electrode tank 1
The water level of 4 is such that the supply water is introduced into the electrode tank 14 by opening and closing the electromagnetic valve 33, so that the water level set according to the load is kept constant.

According to the water resistor having such a configuration, the water level is adjusted with respect to the fixed electrode 13 so that the amount of the electrode 13 immersed in water is adjusted and the load is adjusted. There is no need for a large electrode suspending device at the upper part of the water storage tank 14 or a device for adjusting the exposure length of the electrode by raising and lowering the insulating sheath tube covering the electrode, thereby avoiding an increase in the size of the entire device. In addition to the above, since the movable portion can be eliminated, the structure of the device can be simplified.

In the water resistor having such a configuration,
The inside of the tank body 12 is partitioned into two chambers that are arranged side by side by a partition wall 11 extending in the vertical direction, and one of the chambers is used as an electrode tank 14.
Because the other chamber is configured as the water storage tank 15,
Compared to the conventional configuration in which an electrode tank is provided above the storage tank,
There is an advantage that the entire device can be reduced in size, for example, the height of the entire device can be reduced, and that the device is compact and easy to carry in and out of a predetermined place, and has excellent handling properties.

In particular, the provision of the plurality of casters 17 for movement at the bottom of the tank body 12 facilitates movement of the tank body 12 and facilitates movement to the installation location. Further, in the water resistor having such a configuration, the water in the electrode tank 14 is guided to the upper part of the electrode tank 14, the water is showered from the upper part of the electrode tank 14, and is jetted into the electrode tank 14, and By blowing external air to the shower water to cool the water, the temperature of the water is prevented from rising due to power consumption, so that it is possible to suppress a change in the conductivity of the water. Thus, the adjustment of the load becomes accurate, and the action of consuming the output power of the generator using the water in the electrode tank 14 as a resistance is properly exhibited.

Further, since the water cooling structure is provided integrally with the tank main body 12, it is not necessary to separately install means such as a heat exchanger and a cooling tower on the water resistor, and the size of the entire apparatus can be increased. Can be blocked.

[0048]

As described above, according to the first aspect of the present invention, an exhaust port is opened at the upper part, and the tank body is divided into two chambers by a partition that extends inside in the vertical direction.
An electrode tank formed by one chamber in the tank body, and a required number of fixed electrodes are vertically arranged; a liquid storage tank formed by the other chamber in the tank body to store liquid; and the electrode A liquid circulation device that circulates the liquid between the tank and the liquid storage tank to adjust the liquid level of the liquid that comes into contact with each fixed electrode, and guides the liquid in the electrode tank to the upper part of the electrode tank, and transfers the liquid to the electrode tank. A liquid ejecting device that makes a shower from the upper part of the tank and ejects the liquid toward the inside of the electrode tank, a cooling blower that is provided on the tank body wall and blows external air to the shower liquid to cool the liquid, Therefore, the present invention provides a liquid resistor that has a simple structure, is compact, has a simple structure, can easily cool a liquid in which an electrode is immersed, and can accurately adjust a load. be able to.

According to the second aspect of the present invention, since the liquid storage tank is provided with a liquid replacement device for replenishing the liquid with the liquid in the liquid tank, the liquid level in the liquid tank is determined by the liquid level in the liquid tank. It is kept constant by being introduced inside.

According to the third aspect of the present invention, since the replenishing device for the electrode tank is configured to replenish the liquid to the electrode tank, the liquid level in the electrode tank is adjusted by introducing the replenishing liquid into the liquid storage tank. By doing so, the liquid level set according to the load is kept constant.

According to the fourth aspect of the present invention, since the shielding plate is provided so as to ventilate the opening at the upper end of the liquid storage tank, the shower liquid ejected downward from the upper part of the electrode tank through the ejection liquid supply passage. Is prevented from flowing into the liquid storage tank by the shielding plate.

According to the fifth aspect of the present invention, the liquid circulating device includes a supply passage communicating the bottom of the storage tank with the bottom of the electrode tank, a discharge passage communicating the bottom of the electrode tank with the bottom of the storage tank,
A part of the supply passage and the discharge passage are shared by a single passage, a circulation pump is interposed in the common passage, and the upstream and downstream parts of the common passage of the supply passage, and the discharge Since the passage opening / closing means is interposed at the upstream part and the downstream part of the shared passage, respectively, the supply passage communicating the bottom of the liquid storage tank and the bottom of the electrode tank is opened to drive the circulation pump. The liquid is supplied from the liquid storage tank to the electrode tank, the discharge passage communicating the bottom of the electrode tank and the liquid storage tank bottom is opened, and the liquid is returned from the electrode tank to the liquid storage tank by driving the circulation pump. It is.

According to the sixth aspect of the present invention, the liquid jetting device is a jetting liquid supply passage communicating between the bottom and the upper part of the electrode tank, and a passage extending substantially horizontally in the tank main body at the upper side thereof. And a discharge liquid supply passage provided with a large number of discharge holes opened downward in the passage portion, and a suction pump interposed in the passage. Since it is provided integrally with the water resistor, it is not necessary to separately install a means such as a heat exchanger or a cooling tower on the water resistor, and it is possible to prevent an increase in the size of the entire apparatus and contribute to a reduction in the size of the apparatus.

According to the seventh aspect of the present invention, since the plurality of casters for movement are provided at the bottom of the tank body, the tank body can be easily moved, and can be easily moved to the installation place.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic structure of a water resistor showing one embodiment of a liquid resistor according to the present invention.

FIG. 2 is a front view showing a specific structure of the water resistor.

FIG. 3 is also a plan view

FIG. 4 is a side view of the same.

FIG. 5 is a front view of an exhaust duct.

FIG. 6 is a front view of an electrode.

FIG. 7 is a side view showing a connection structure of electrodes.

8 is an enlarged view of FIG.

FIG. 9 is a side view showing a conductor connection structure to electrodes.

FIG. 10 is a wiring diagram of a motor for driving a pump, a motor for driving a fan of a ventilation fan, and an electromagnetic valve for a three-phase AC power supply.

FIG. 11 is a circuit diagram thereof.

FIG. 12 is a front view showing an example of a conventional liquid resistor.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 10 exhaust port 11 partition wall 12 tank body 13 fixed electrode 14 electrode tank 15 water storage tank 17 caster 23A, 23B supply pipe 24A, 24B discharge pipe 25 common pipe 26 load control line pump 27A, 27B, 28A, 28B electromagnetic valve 28 ejection Water supply pipe 28a Jet hole 29 Cooling line pump 30 Ventilation fan

Claims (7)

[Claims] 1. A tank body divided into two chambers by a partition wall having an exhaust opening at an upper part and having a vertically extending inside, and a required number of fixed electrodes formed by one chamber in the tank body. An electrode tank, which is disposed vertically, and a liquid storage tank formed by the other chamber in the tank main body and storing liquid, and circulating liquid between the electrode tank and the liquid storage tank to fix each fixed electrode A liquid circulation device for adjusting the liquid level of the liquid that comes into contact with the liquid; A liquid resistor, comprising: an apparatus; and a cooling blower provided on the tank body wall to blow external air to the shower liquid to cool the liquid. 2. The liquid resistor according to claim 1, further comprising a refilling device for a liquid storage tank for replenishing the liquid with the liquid storage tank. 3. The liquid resistor according to claim 1, further comprising a replenishing device for an electrode tank for replenishing the electrode tank with a liquid. 4. The liquid resistor according to claim 1, further comprising a shielding plate for permeablely shielding an upper end opening of the liquid storage tank. 5. The liquid circulation device according to claim 1, further comprising a supply passage connecting the bottom of the storage tank and the bottom of the electrode tank, and a discharge passage connecting the bottom of the electrode tank and the bottom of the storage tank. A part of the passage is shared by a single passage, a circulation pump is interposed in the shared passage, and the upstream and downstream portions of the supply passage common passage and the discharge passage common passage upstream The liquid resistor according to any one of claims 1 to 4, wherein a passage opening / closing means is interposed in each of the part and the downstream part. 6. The liquid jetting device according to claim 1, further comprising a jetting liquid supply passage communicating between a bottom portion and an upper portion of the electrode tank, the passage portion extending substantially horizontally in the tank main body at an upper side thereof. 6. An ejection liquid supply passage having a large number of ejection holes opened downward in the liquid supply passage, and a suction pump is interposed in the passage. The liquid resistor as described. 7. The liquid resistor according to claim 1, further comprising a plurality of casters for movement at the bottom of the tank body.