JP5817984B2 - Liquid supply device - Google Patents

Description

  The present invention relates to a liquid supply apparatus that supplies a conductive liquid to a predetermined supply target member via a hose by a pump with an electric motor.

  Conventionally, an electric motor has been used as a drive source for rotational drive in many fields, and in the field of automobiles, it is also used as a drive source for radiator fans, fuel pumps, water pumps, and the like. This electric motor is usually controlled by a rotor having a plurality of permanent magnets, a stator having a plurality of laminated cores and coils wound around these cores, and a method such as PWM (Pulse Width Modulation). And a drive circuit for transmitting a drive pulse based on a control signal from the control circuit to the coil of the stator. The control circuit is provided with a microcomputer for performing control arithmetic processing, and the drive circuit is provided with a reactor, a rectifier, a transistor constituting a switching circuit, and the like.

The electric motor is known to generate an electromagnetic wave (electromagnetic noise) that affects an electronic device from roughly two parts because of its configuration.
The first is electromagnetic noise emitted from a control circuit installed on the control board.
Since the control circuit includes a crystal oscillator that performs a periodic count operation, electromagnetic waves of a certain period are emitted from the crystal oscillator due to the count operation by the crystal oscillator, and electromagnetic waves are also emitted from the control circuit itself. Has been.

The second is electromagnetic noise generated from a stator coil or the like.
Electromagnetic waves are generated from the drive circuit itself and the winding coil connected to the drive circuit.
Since the winding coil has inductance, when the energized current is switched from on to off or from off to on, a large counter electromotive force is induced in the winding coil by the self-induction action, and electromagnetic waves are generated from the coil. Will occur.

Conventionally, the casing of an electric motor is formed of a conductive metal material, and even if the electric motor itself generates electromagnetic noise, the metal casing is grounded (grounded) via a fixed member. There was almost no influence of electromagnetic noise.
On the other hand, for the purpose of reducing the weight and cost of components, there are many cases where the casing for housing components such as an electric motor is changed from metal to lightweight and inexpensive synthetic resin.
In this way, when the material of the casing of the electric motor is changed to a non-conductive synthetic resin casing, the interior of the electric motor and the ground are electrically insulated, so electromagnetic noise generated inside the electric motor is casing. There is a possibility that it will be emitted to the outside through the cable and affect the electronic equipment for communication.

  In particular, vehicles such as automobiles are equipped with many communication electronic devices such as a radio, a television, a navigation system, and a keyless entry system. Since various sensors and antennas are attached to the vehicle body as receiving parts of these communication electronic devices, electromagnetic noise radiated from the electric motor may cause radio noise or malfunction of each electronic device. Therefore, a technique for suppressing electromagnetic noise radiated from the electric motor has been proposed.

  In the fuel pump with an electric motor of Patent Document 1, a pump module housed in a metal subtank is disposed in a fuel tank made of synthetic resin, and the metal subtank surrounding the pump module is grounded to the vehicle body by a seal ground wiring. It is connected. Thereby, the electromagnetic noise radiated | emitted from power MOSFET equivalent to the switching circuit of a fuel pump is interrupted | blocked by metal subtanks, and generation | occurrence | production of the electromagnetic noise radiated | emitted outside is suppressed.

  In recent years, in order to improve fuel efficiency, a generator, drive motor, inverter, travel battery, etc. are mounted on the vehicle in addition to the engine and fuel tank, and the travel power source of the vehicle can be switched between the engine and the drive motor. The demand for hybrid vehicles is increasing. In this hybrid vehicle, the devices that operate according to the driving power source are different, and therefore, the required cooling temperature from the engine side is different from the required cooling temperature from the drive motor (hybrid) side. Therefore, each power source is provided with two cooling systems capable of circulating the cooling water independently.

  Although the engine cooling system can circulate the cooling water between the engine and the radiator using a water pump driven by the engine, the hybrid cooling system has a water motor with an electric motor that can independently drive the cooling water. A pump is used to circulate between the hybrid radiator through a cooling water passage such as a rubber hose. These cooling systems usually use the same component radiator cooling water (Long Life Coolant: LLC), and the composition of this radiator cooling water is JIS standard ethylene glycol as an antifreeze component and rust prevention. It is defined as a phosphate-based substance as an agent component and 5% or less of water.

JP 2008-38901 A

  In the fuel pump with an electric motor of Patent Document 1, since the metal subtank surrounding the pump module is grounded to the vehicle body (ground) via the seal ground wiring, electromagnetic noise generated from the electric motor is detected by the metal subtank. It can block and suppress electromagnetic noise radiated to the outside. However, in this fuel pump with an electric motor, although the fuel tank has been reduced in weight by changing the material of the fuel tank from metal to synthetic resin, a new metal sub tank or seal ground wiring has been added to the fuel pump. Therefore, there is a risk of increasing the weight and cost of the entire apparatus.

  As a result of intensive studies by the present inventors, electromagnetic noise generated from an electric motor when the circulated moving medium (liquid) contains many ions and has conductivity like the above-described cooling system that circulates cooling water. Is propagating in the cooling water, and when the passage member (rubber hose or the like) forming the cooling water passage has conductivity, electromagnetic noise generated from the electric motor propagates in the passage member. In particular, the inventors have found that the cooling water or the passage member of the cooling water functions as a transmitting antenna that transmits electromagnetic noise to the surroundings.

  Therefore, the higher the conductivity of the moving medium, the higher the antenna effect due to the moving medium. Even if the moving medium is extremely low in conductivity such as pure water or petroleum, the conductivity of the passage member is high. The higher the is, the higher the antenna effect of the passage member is, and there is a possibility that electromagnetic noise transmitted from the electric motor to the surroundings through the passage member may increase. In other words, when the casing of the water pump with an electric motor is changed to a synthetic resin casing, which is a non-conductive material, the electric motor transmits to the surroundings via a passage member such as a rubber hose regardless of the conductivity of the moving medium. There is a risk of increased electromagnetic noise.

  An object of the present invention is to provide a liquid supply device capable of achieving both weight reduction of the device and suppression of electromagnetic noise transmitted from the electric motor to the surroundings regardless of the conductivity of the liquid.

Liquid supply apparatus according to claim 1, comprising a pump mounted on a vehicle having an electronic device for communication, the electric motor with pump and an electric motor for driving the pump, the discharge side of the electric motor with pump A conductive liquid that functions as an antenna when flowing to a predetermined supply target member via a discharge-side hose connected to the discharge-side hose, and the suction-side hose connected to the suction side of the pump with the electric motor in the liquid supply apparatus for circulating in the circuit of the electrically conductive liquid by the supply target member returning the conductive liquid to the electric motor with pump, formed by and non-conductive material containing the said pump and the electric dynamic motor has been the provided housing, formed of a material containing the discharge conductivity-side hose and the suction side hose material or a conductive material, the discharge-side It is characterized in that the over scan and the suction-side hose on the ground ground.

  In this liquid supply apparatus, since the casing that accommodates the pump and the electric motor is formed of a non-conductive material such as a synthetic resin, the pump with the electric motor is compared with the pump with the electric motor that uses a metal casing. Weight reduction and cost reduction can be achieved.

Invention 請 Motomeko 2 is the invention of claim 1, wherein the electric motor with pump is characterized in that a water pump for supplying cooling water to the electronic device.
According to a third aspect of the present invention, in the second aspect of the invention, the electronic device is an in-vehicle electronic device.

According to the invention of claim 1, even if the casing of the pump with the electric motor is formed of a non-conductive material such as synthetic resin, the hose that is the liquid movement path can be reliably grounded. Regardless of the length of the hose that functions as a conductive or transmitting antenna, it is possible to suppress the electromagnetic noise transmitted from the electric motor to the surroundings while reducing the weight of the liquid supply device with a simple structure. And malfunction of electronic equipment can be prevented.
In addition, even a liquid supply device that supplies a highly conductive liquid with a high antenna effect can be reliably grounded using a hose that is a liquid movement path, without increasing the number of components. Electromagnetic noise can be suppressed.

According to the invention 請 Motomeko 2, even cooling water such that the fluid with a high conductivity, can prevent erroneous operation of the electronic device by electromagnetic noise generated from the electric motor.
According to the invention of claim 3 , malfunction of the vehicle-mounted electronic device due to electromagnetic noise generated from the electric motor can be prevented.

It is a top view of the vehicle carrying the HV cooling system which concerns on Example 1 of this invention. It is a perspective view of an engine unit. It is a partial longitudinal cross-sectional view of a pump with an electric motor. It is a figure which shows the electric constitution of an electric motor. It is a figure which shows the support structure of the pump with an electric motor. It is a figure which shows the movement path | route of the cooling water of HV cooling system. It is a principal part enlarged view which shows the modification of ground contact. It is a principal part enlarged view which shows another modification of ground contact.

  Hereinafter, modes for carrying out the present invention will be described based on examples. 2, 3, and 5, the vertical direction is the vertical direction, and the horizontal direction is the horizontal direction.

Embodiment 1 of the present invention will be described below with reference to FIGS.
As shown in FIGS. 1 and 2, the hybrid vehicle V includes an engine unit EU, a hybrid cooling system 1 (fluid supply device), a traveling high-voltage battery B, and the like.
The hybrid vehicle V includes a radio receiver R, a navigation system, a keyless entry system, and the like as in-vehicle electronic devices, and a plurality of sensors and antennas corresponding to these in-vehicle electronic devices. The rear window glass is provided with a glass antenna A electrically connected to the radio receiver R.

  Hybrid cooling system 1 (hereinafter referred to as HV cooling system) includes a pump 2 with an electric motor that can discharge cooling water as a moving medium by pressurization, a hose 3 that forms a cooling water moving path, and a supply target member. For example, a hybrid radiator 4 (hereinafter referred to as an HV radiator) for cooling the cooling water whose temperature has been raised by the heat exchange.

  In the HV cooling system 1, long life coolant (LLC) is used as cooling water, similarly to an engine cooling system (not shown). LLC contains ethylene glycol as an antifreeze component and a phosphate-based substance (for example, potassium phosphate) as a rust inhibitor component. Since this phosphate has a high ionization tendency and has a higher bondability to metal than oxygen in the air, it forms an anticorrosive film on the metal surface by ion bonding with the metal.

First, the pump 2 with an electric motor will be described.
As shown in FIGS. 3 to 5, the pump 2 with an electric motor includes a cylindrical casing 20 made of synthetic resin, a pump 21 for moving cooling water, an electric motor 22 that rotationally drives the pump 21, A control base 25 on which a control circuit 23 and a drive circuit 24 for controlling and driving the motor 22 are disposed, a shaft 26 that forms a common rotation axis for the drive shaft of the pump 21 and the rotation shaft of the electric motor 22, and the like. Yes.

The casing 20 is made of a synthetic resin of a non-conductive material, and includes a casing 20a in which the pump 21 is accommodated, a cylindrical casing 20b in which the electric motor 22 is accommodated, and a casing 20c in which the control base 25 is accommodated. It is formed by three members.
The casing 20a is integrally formed with a pipe-shaped suction hole 20d for sucking the recirculated cooling water and a pipe-shaped discharge hole 20e for discharging the pressurized cooling water to the outside. The suction hole 20d is formed to extend upward from the upper central position of the casing 20a and has a common axis with the axis of the shaft 26. The discharge hole 20 e is formed so as to extend in the horizontal direction from the right side portion of the casing 20 a and has an axis that is orthogonal to the axis of the shaft 26.

  As shown in FIG. 5, the casing 20 is fixed to the vehicle body member VB via a metal mounting bracket 50. The mounting bracket 50 mounts the casing 20 (the pump 2 with the electric motor) and extends in the horizontal direction, and extends upward from the end of the support portion 50a and is attached to the vehicle body member VB via bolts or the like. It is formed by the fastening part 50b which can be fastened. The support portion 50a is provided with an opening through which the casing 20c can be inserted from above, and the casing 20b is fastened by bolts or the like.

  As shown in FIG. 3, the pump 21 includes an impeller 21a fixed to the tip portion of the shaft 26, a vortex chamber 21b in which the impeller 21a can rotate inside the casing 20a, and the like. The impeller 21a has a plurality of blade portions, and the plurality of blade portions divide the inside of the casing 20a into a plurality of spaces in the circumferential direction. Therefore, when the shaft 26 is rotated, the cooling water is sucked from the suction hole 20d by the rotation of the impeller 21a, and the cooling water pressurized by the plurality of blades is discharged from the discharge hole 20e.

  As shown in FIGS. 3 and 4, the electric motor 22 includes three sets of stators 22 a, 22 b, and 22 c as stators, a rotor 22 d as a rotor fixed to a middle portion of the shaft 26, and the like. It is a phase AC motor.

  The three sets of stators 22a, 22b, and 22c are configured by winding coils connected to an AC power source around the stator cores 22x, 22y, and 22z, respectively. Each of the stator cores 22x, 22y, and 22z is formed by laminating a plurality of magnetic body pieces, and is fixed to the casing 20b so as to be arranged at equal intervals (every 120 ° intervals) in the circumferential direction. The rotor 22d has a plurality of pairs of permanent magnets 22f fixed in the circumferential direction.

As shown in FIG. 4, the control circuit 23 includes a CPU 23 a that calculates the rotation speed of the electric motor 22 and an energization ratio (duty ratio) corresponding to the rotation speed, a crystal oscillator 23 b that operates the CPU 23 a, and the like. It is formed as a microprocessor.
The drive circuit 24 is formed by an inverter including drive transistors 24a, 24b, and 24c, a rectifier (not shown), a reactor (not shown), and the like.
The drive circuit 24 constitutes a switching circuit that changes the applied voltage based on the control signal (duty ratio of the switching pulse) transmitted from the control circuit 23 and controls the on / off of the drive transistors 24a, 24b, and 24c.

  As a result, a rotating magnetic field is generated in the electric motor 22 by passing a three-phase alternating current through the stators 22a, 22b, and 22c. Therefore, the rotor 22d can be rotated using the tensile torque generated by the rotating magnetic field. The impeller 21a is rotationally driven through a shaft 26 fixed to the shaft. The discharge amount of the pump 21 is controlled by changing the torque (duty ratio of the switching pulse) of the electric motor 22 and the frequency of the AC power supply.

Next, the engine unit EU provided with the HV cooling system 1 will be briefly described.
As shown in FIG. 2, the engine unit EU contains an in-line four-cylinder engine E, a power generator (not shown) driven by the engine E, and a travel motor (not shown) connected to the battery B. The transaxle TA and the power control unit PU are integrally formed. The engine unit EU is supported on a front frame (not shown) via a plurality of engine mounts.

  The engine E is disposed horizontally so that the cylinder arrangement direction is the vehicle width direction, and includes an engine cooling system (not shown) for cooling each cooling target member (for example, a combustion chamber) of the engine E. Yes. The engine cooling system includes an engine radiator (not shown) disposed on the front side of the engine E, a water pump (not shown) connected to the rotating shaft of the engine E, and cooling water discharged from the water pump. Is constituted by a cooling water passage or the like for circulating the air to the engine radiator via the member to be cooled.

  The transaxle TA is arranged at the lower part of the right side (left side with respect to the vehicle traveling direction) of the engine E, and the power control unit PU is provided at the upper part of the transaxle TA. The power control unit PU is an in-vehicle electronic device including an inverter that drives a traveling motor, a boost converter, a DC-DC converter, and the like. A reservoir tank 5 that separates gas from cooling water circulating in the HV cooling system 1 is disposed at a position on the rear side of the power control unit PU. The reservoir tank 5 is made of a synthetic resin material, and is fixed to the vehicle body member by a mounting bracket.

Next, the hose 3 that forms the moving path of the cooling water will be described.
In the HV cooling system 1 of the present embodiment, as shown in FIG. 6, the transaxle TA, the power control unit PU, the HV radiator 4, the reservoir tank 5 and the like are cooling water supply target members, and each supply target member is a hose. 3 are connected in series. The hose 3 is formed in a loop shape from the discharge hole 20e of the pump 2 with an electric motor to the suction hole 20d, and includes a plurality of flexible hose portions 31 to 37. The plurality of hose portions 31 to 37 are made of a rubber material to which carbon (C) is added and has conductivity.

  As shown in FIGS. 2, 5, and 6, the discharge hole 20 e of the pump 2 with the electric motor and the transaxle TA are connected by a hose portion 31, a hose portion 32, and a metal pipe member 41. The hose portion 31 has an upstream end fastened to the discharge hole 20e by the clip 61, extends outward from the discharge hole 20e in the vehicle width direction, and is formed in a substantially U shape in front view. The downstream end of the hose portion 31 is connected to one end of a pipe member 41 whose axial center extends in the vehicle width direction at a position near the lower side of the pump 2 with the electric motor. The hose portion 32 is connected to the other end of the pipe member 41, extends in the vehicle width direction, and is connected to the transaxle TA. Thereby, the cooling water discharged from the discharge hole 20 e passes through the hose portion 31 and the hose portion 32 connected to the hose portion 31 via the pipe member 41 and is supplied to the transaxle TA.

The transaxle TA and the HV radiator 4 installed at the upper position of the engine radiator are connected by a hose portion 33 extending in the vehicle width direction.
One end of the hose part 33 is connected to the front part of the transaxle TA, and the other end is connected to the outer end part in the vehicle width direction of the HV radiator 4. The cooling water supplied to the HV radiator 4 moves through the passage in the HV radiator 4 toward the center in the vehicle width direction, and exchanges heat with the traveling wind at the time of the transition.

The hose portion 34 is formed in a substantially U shape in a plan view from the vehicle width direction center side end portion of the HV radiator 4 and connected to the front side portion of the power control unit PU.
After cooling the power control unit PU, the cooling water is supplied to the reservoir tank 5 through a hose portion 35 extending from the rear portion of the power control unit PU to the rear upper side.

The reservoir tank 5 and the suction hole 20d are connected by a hose portion 36, a hose portion 37, and a metal pipe member 42. The hose portion 36 extends forward and downward from the front portion of the reservoir tank 5 and is connected to the upper end of a pipe member 42 whose axial center extends in the vertical direction at a position near the upper side of the pump 2 with the electric motor. The hose portion 37 has an upstream end connected to the lower end of the pipe member 42, and a downstream end fastened to the suction hole 20 d by a clip 62. The pipe member 42 is disposed so as to be substantially vertically above the pipe member 41.
As a result, the cooling water separated in the reservoir tank 5 passes through the hose portion 36 and the hose portion 37 connected to the hose portion 36 via the pipe member 42 and is returned to the suction hole 20d.

  As shown in FIG. 5, the pipe members 41 and 42 are coupled to the mounting bracket 50 via metal connection brackets 51 and 52, respectively. The connection bracket 51 extending in the vertical direction has its lower end joined to the outer peripheral portion of the pipe member 41, the upper end fixed to the lower portion of the fastening portion 50b, and the connection bracket 52 extending in the vertical direction has the upper end connected to the outer peripheral portion of the pipe member 42. The lower end is fixed to the upper part of the fastening part 50b. Therefore, the connection bracket 51 and the connection bracket 52 are arranged substantially linearly via the fastening portion 50b. Thereby, the hose 3 is grounded via the pipe members 41, 42, the connection brackets 51, 52 and the mounting bracket 50.

Next, operations and effects of the HV cooling system 1 according to the first embodiment will be described.
This HV cooling system 1 has a pump 21, an electric motor 22, and a casing 20 that accommodates a control circuit 23 and a drive circuit 24, which is made of synthetic resin. Therefore, the HV cooling system 1 is compared with a pump with an electric motor using a metal casing. Thus, weight reduction and cost reduction of the pump 2 with the electric motor can be achieved. In addition, since the hose 3 that is the moving path of the cooling water can be reliably grounded via the pipe members 41, 42, etc., the conductivity of the cooling water and the length of the hose 3 that functions as a transmitting antenna are concerned. However, electromagnetic noise transmitted from the electric motor 22 to the surroundings through the hose 3 can be suppressed while reducing the weight of the HV cooling system 1 with a simple structure, and malfunction of the electronic device can be prevented.

Even if the cooling water circulating through the HV cooling system 1 is a component with a high ionization tendency that increases the antenna effect, it can be reliably grounded by using the hose 3 that is the moving path of the cooling water. Electromagnetic noise can be suppressed without increasing.
Since the pump 2 with the electric motor is a water pump that supplies the cooling water having conductivity to the power control unit PU, even if the cooling water is a radiator cooling water having high conductivity, the electromagnetic generated from the electric motor 22 It is possible to prevent malfunction of the power control unit PU due to noise.

Based on FIG. 7, a modification 1A of the HV cooling system 1 according to the first embodiment will be described.
Only the configuration different from the HV cooling system 1 of the first embodiment will be described, and the same members as those of the first embodiment are denoted by the same reference numerals and the description thereof will be omitted.

  As shown in FIG. 7, the hose 3A of the HV cooling system 1A is formed in a loop shape from the discharge hole 20e to the suction hole 20d of the pump 2 with the electric motor, and has conductivity with carbon (C) added. It is formed with the rubber material which has. The discharge hole 20e of the pump 2 with the electric motor and the transaxle TA are connected by the hose portion 31A alone without using the pipe member 41 shown in the first embodiment. The hose portion 31A is fixed to the vehicle body member VB by a metal mounting bracket 50A.

  As a result, the hose portion 31A can be directly grounded to the ground via the mounting bracket 50A without using a conductive joint member or the like, so that the number of parts can be further reduced and electromagnetic noise generated from the electric motor 22 to the outside can be reduced. It can be effectively suppressed.

Based on FIG. 8, another modification 1B of the HV cooling system 1 according to the first embodiment will be described.
As shown in FIG. 8, the hose 3B of the HV cooling system 1B is formed in a loop shape from the discharge hole 20e to the suction hole 20d of the pump 2 with the electric motor, and has conductivity with carbon (C) added. It is formed with the rubber material which has. The suction hole 20d of the pump 2 with the electric motor and the reservoir tank 5 are connected by a single hose portion 36A. The downstream end of the hose portion 36A is fastened to the suction hole 20d by a metal clip 62A having conductivity, and the clip 62A is fixed to the vehicle body member VB by a bolt 63.

  Thereby, since the clip 62A is provided in the suction hole 20d of the pump 21, the length from the suction hole 20d forming the antenna for transmitting electromagnetic noise to the ground contact point (clip 62A) can be minimized. Electromagnetic noise transmitted from the electric motor 22 to the surroundings via the hose 3B can be prevented.

Next, a modification in which the above embodiment is partially changed will be described.
1] In the above embodiment, an example in which the pipe member for grounding the ground is provided in the vicinity of the suction hole and the discharge hole, but the pipe member may be provided in at least one of them. Moreover, it is also possible to arrange | position a pipe member between other cooling water supply object members, and to provide three or more places.

2] In the above embodiment, the example in which the hose for circulating the cooling water is formed of a magnetic material containing carbon has been described. However, at least the hose only needs to have conductivity, and is formed of another conductive material. It is also possible to use a special hose.
3) In the above-described embodiment, the example applied to the HV cooling system for a vehicle has been described. However, it is sufficient that at least a pump with an electric motor capable of supplying a conductive liquid is provided, and an electric motor such as a machine tool or a building machine may be provided. It may be applied to a pump with a pad.

4) In the above embodiment, the example in which the pump with the electric motor incorporates both the control circuit and the drive circuit has been described. However, the pump with the electric motor only needs to include at least the stator inside the casing. Can also be installed outside the casing.
In the case of a control circuit including a drive circuit, only the control circuit may be accommodated inside the casing, or only the drive circuit is accommodated inside the pump with the electric motor, and the control circuit is arranged outside the pump with the electric motor. It is also possible.

5) In the above embodiment, an example in which the reservoir tank is formed of a synthetic resin material has been described. However, the reservoir tank may be formed of a conductive material such as metal and the reservoir tank may be grounded as a conductive joint member. . In this case, the reservoir tank is grounded by being fixed to the engine or the vehicle body via a metal mounting bracket.
6) In addition, those skilled in the art can implement the present invention in various forms added with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

  The present invention provides a liquid supply apparatus that supplies liquid to a predetermined supply target member via a hose by a pump with an electric motor, and the hose is formed of a conductive material, and a part of the hose is grounded to ground. Regardless of the electrical conductivity, it is possible to achieve both weight reduction of the apparatus and suppression of electromagnetic noise transmitted from the electric motor to the surroundings.

DESCRIPTION OF SYMBOLS 1 HV cooling system 2 Pump with electric motor 3 Hose 4 HV radiator 20 Casing 20d Suction hole 20e Discharge hole 21 Pump 22 Electric motor 23 Control circuit 24 Drive circuit 41, 42 Pipe member 50, 50A Mounting bracket 51, 52 Connection bracket 62A Clip TA transaxle PU power control unit

Claims (3)

A pump mounted on a vehicle having an electronic device for communication, comprising an electric motor with pump and an electric motor for driving the pump, through a connected discharge side hose to the discharge side of the electric motor with pump The conductive liquid that functions as an antenna when flowing to a predetermined supply target member, and the conductive liquid is supplied from the supply target member via a suction side hose connected to the suction side of the pump with the electric motor. In the liquid supply apparatus for circulating the conductive liquid in the circuit by returning to the pump with the electric motor ,
A casing formed by and non-conductive material containing the said pump and the electric dynamic motor provided,
Wherein the discharge-side hose and the suction-side hose is made of a material containing a conductive material or a conductive material, a liquid supply apparatus, characterized in that the discharge side hose and the suction-side hose and the grounded. The liquid supply apparatus according to claim 1, wherein the pump with an electric motor is a water pump that supplies cooling water to an electronic device. The liquid supply apparatus according to claim 2 , wherein the electronic device is a vehicle-mounted electronic device.

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