JP2013241903A - Electric water pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight electric water pump in which the cooling performance of a motor is high, the electric power is not wastefully consumed, and the performance of a pump is enhanced.SOLUTION: An accommodation space S formed inside a resin-made housing 2 is demarcated into a motor room S1 and a pump room S2 by a bulkhead 3 made of an aluminum alloy. A motor 6 is accommodated in the motor room S1, and an impeller 7, which is rotation-integrally fixed to an output shaft 5 of the motor 6 and sucks/discharges water by rotational operation, is accommodated in the pump room S2.

Description

  The present invention relates to an electric water pump that sucks and discharges water by rotating an impeller.

  In recent years, there has been a demand for reducing the weight of a vehicle in order to improve fuel efficiency, and an electric water pump used in a vehicle is becoming common in which various parts are made of resin.

  For example, the electric water pump disclosed in Patent Document 1 is a so-called canned type, and includes a resin housing having a housing space inside, and the housing space is separated from the motor chamber by a resin partition. It is divided into a pump room.

  The motor chamber is partitioned by a cylindrical stainless steel can into a first space inside the can and an annular second space outside the can. A rotor and an output shaft are disposed in the first space, a stator is disposed in the second space, and the output shaft is fitted into the pump chamber. The pump chamber accommodates an impeller having a plurality of blades, and is fixed to the output shaft of the motor so as to rotate together.

  A plurality of communication holes for communicating the first space and the pump chamber are formed in a portion corresponding to the first space of the partition wall, and water in the pump chamber is supplied from the communication holes to the first space. The first space is filled with water by being guided to the space, and the motor is cooled.

JP 2008-274890 A (paragraphs 0022 to 0027, FIG. 1)

  However, the electric water pump as disclosed in Patent Document 1 is lightweight and has high cooling performance around the motor. However, since the rotor is immersed in water, when the rotor rotates in water, the water agitation resistance This puts a load on the motor and wastes power.

  Further, since water moves between the pump chamber and the first space through each communication hole, the flow of water is disturbed in the pump chamber when the water is sucked / discharged by the rotation operation of the impeller. There is a risk that the resistance of water passing through the pump chamber will increase and the performance of the pump will deteriorate.

  The present invention has been made in view of such a point, and an object of the present invention is to reduce the weight of the motor and to improve the performance of the pump without wastefully consuming electric power with a high motor cooling performance. An object of the present invention is to provide an electric water pump.

  In order to achieve the above object, the present invention is characterized in that the housing space inside the resin housing is divided into two spaces by a partition wall made of a metal having high heat dissipation.

  That is, in the first invention, a resin-made cylindrical housing having an accommodation space is provided, and the accommodation space is partitioned into two spaces by a partition wall made of a metal having high heat dissipation, and one partition space is provided. Is characterized in that a motor is accommodated, and the other compartment space contains an impeller that is fixed integrally with the output shaft of the motor and that sucks and discharges water by a rotating operation.

  According to a second aspect, in the first aspect, the partition wall has a peripheral wall extending around the outer peripheral edge and surrounding the motor.

  According to a third invention, in the first or second invention, the housing is formed by joining the first and second divided bodies, which are divided into two in the direction of the center line of the cylinder, with their respective opening edge portions abutted against each other. The partition is insert-molded in the first divided body.

  According to a fourth invention, in the third invention, at the opening edge of each of the first and second divided bodies, concave grooves facing each other are annularly provided over the entire circumference of the opening, An annular resin introduction portion is formed by the both concave grooves in a state where the opening edge portions of each of the first and second divided bodies are butted together, and a molten resin is introduced into the resin introduction portion and solidified. The both opening edge portions are joined via a resin ring.

  In the first invention, since the housing of the electric water pump is made of resin, the weight of the entire electric water pump can be reduced. In addition, the heat generated by the rotation of the motor moves to the water in the pump chamber sequentially through the partition wall made of metal with high heat dissipation, so the motor periphery does not become hot and the motor periphery is cooled efficiently. Can do. Furthermore, since the rotor of the motor does not rotate in water, there is no load on the motor due to the stirring resistance of water, and power is not wasted. In addition, since the pump chamber that houses the impeller and the motor chamber that houses the motor are completely separated by a partition wall, the water flows between the pump chamber and the motor chamber, so that the water flows in the pump chamber. The water can flow smoothly through the pump chamber and the pump performance can be improved.

  In the second invention, since the peripheral wall surrounds the motor and the area of the partition wall facing the motor is increased, the partition wall can absorb a lot of heat generated by the rotation of the motor at a time, and the water in the pump chamber can be efficiently collected. Can dissipate heat.

  In 3rd invention, since a partition is integrally assembled | attached to a 1st division body by insert molding, an assembly man-hour can be reduced and the sealing performance between a partition and a 1st division body can be improved.

  In the 4th invention, since the whole part which the 1st and 2nd division body faced is connected continuously by a resin ring, the sealing nature between the 1st and 2nd division body can be improved. Moreover, it is not necessary to prepare a separate sealing member, and the number of parts can be reduced to reduce the cost.

It is sectional drawing of the electric water pump which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the state which fills the cavity in a metal mold | die with the 1st division body which concerns on Embodiment 1 of this invention, and is shape | molded. It is sectional drawing which shows the state which has filled the resin in the cavity in a metal mold | die with respect to the 2nd division body which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the state which integrated the 1st and 2nd division body which concerns on Embodiment 1 of this invention via the resin ring. FIG. 3 is a view corresponding to FIG. 1 according to Embodiment 2 of the present invention. FIG. 3 is a view corresponding to FIG. 2 according to Embodiment 2 of the present invention. FIG. 5 is a view corresponding to FIG. 4 according to Embodiment 2 of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.
Embodiment 1 of the Invention
FIG. 1 shows an electric water pump 1 according to Embodiment 1 of the present invention. The electric water pump 1 is for supplying water to various regions (for example, a radiator, a heater core, an oil cooler, etc.) of the vehicle, and is attached to a fixed side (not shown) of the vehicle.

  The electric water pump 1 includes a substantially cylindrical resin housing 2 having both ends opened, and a housing space S is formed inside the housing 2.

  The housing 2 is divided into two in the cylinder center line direction, the first half-divided body 2a located on one side in the cylinder center line direction, and the second half-divided part located in the other side in the cylinder center line direction. And a body 2b, each of the opening edge portions 20a and 20b of each of the first divided body 2a and the second divided body 2b are butted and joined.

  In the opening edge 20a, a first groove 21 is annularly provided over the entire circumference of the opening, and an inner edge portion of the opening of the first groove 21 protrudes from an outer edge. Yes.

  The opening edge 20b is provided with a second groove 22 facing the first groove 21 in an annular shape over the entire circumference of the opening. The edge part protrudes from the outer edge part.

  When the opening edge portions 20a and 20b of the first divided body 2a and the second divided body 2b are abutted with each other, the inner edge portion of the first groove 21 opening and the second groove 22 opening. The inner end edge portion of the first contact groove portion 22 comes into contact with the first groove groove 21 and the second groove groove 22 to form an annular first resin introduction portion 23a.

  Also, an annular second resin introduction portion that is continuous with the first resin introduction portion 23a between the outer edge portion of the first groove 21 opening and the outer edge portion of the second groove 22 opening. 23b is formed.

  Further, by introducing molten resin into the first and second resin introduction portions 23a and 23b and solidifying, both the opening edge portions 20a and 20b are joined through the resin ring 24 to form the housing 2. It has come to be.

  Inside the opening edge 20a of the first divided body 2a, an aluminum alloy partition wall 3 is disposed to close the opening. The partition wall 3 allows the housing space S to be placed in a motor chamber S1 (on the first divided body 2a side). It is partitioned into a first partition space) and a pump chamber S2 (second partition space) on the second divided body 2b side.

  The partition wall 3 extends from the outer peripheral edge of the partition body 30a to the motor chamber S1 along the inner surface of the first divided body 2a. And a peripheral wall 30b.

  A through hole 3a is formed at the center of the partition wall body 30a, and an output shaft 5 extending in the cylinder center line direction of the housing 2 is rotatably fitted to the through hole 3a via a mechanical seal 3b. Yes.

  A so-called axial gap type motor 6 is accommodated in the motor chamber S1 so as to be surrounded by the peripheral wall 30b.

  The motor 6 includes a thick disk-shaped stator 6 a having a plurality of coils (not shown), and the stator 6 a has a central axis that coincides with the cylinder center line of the housing 2 at the central portion of the output shaft 5 on the motor chamber S 1 side. And is fixed to the inner side surface of the peripheral wall 30b.

  A pair of thin disk-like rotors 6b having a plurality of magnets 6c around the output shaft 5 are fixed to the output shaft 5 integrally with the output shaft 5 on both sides of the stator 6a in the cylinder center line direction. The output shaft 5 is rotated by the magnetic action of a magnet 6c and a coil (not shown).

  A short cylindrical portion 25 having a communication hole 25a communicating with the pump chamber S2 is integrally provided at the center of the other end in the cylinder center line direction of the second divided body 2b, and the tip of the short cylindrical portion 25 is It is connected to a water supply tank (not shown).

  In the pump chamber S2, an impeller 7 having a plurality of blades 7a provided at equal intervals around the output shaft 5 is fixed integrally with the rotation, and by the rotation operation of the impeller 7 accompanying the rotation of the output shaft 5, Water is sucked into the pump chamber S2 from the front end opening of the short cylindrical portion 25 through the communication hole 25a, and is pressurized in the pump chamber S2 while rotating and moving through the pump chamber S2, so that water discharge (not shown) is performed. It is discharged from the outlet.

  That is, the electric water pump 1 sucks and discharges water by rotating the impeller 7 accommodated in the pump chamber S2.

  The first divided body 2a is injection molded by the first mold 8.

  As shown in FIG. 2, the first mold 8 includes a first fixed mold 81 and a first movable mold 82 that is opposed to the first fixed mold 81 so as to be able to advance and retreat.

  In the center of the first fixed mold 81, an arrangement space 80a is formed penetrating vertically so as to arrange the assembly 10 in which the output shaft 5, the motor 6 and the impeller 7 are assembled to the partition wall 3 and the peripheral wall 30b.

  The inner surface of the upper half portion of the first fixed mold 81 constitutes a molding surface 81a for molding the surface of the first divided body 2a.

  On the other hand, on the inner surface of the lower half portion of the first fixed mold 81, an annular bulging portion 81b that bulges into the arrangement space 80a is formed, and the assembly 10 is in such a position that the impeller 7 is positioned upward. Is inserted into the arrangement space 80a from above, the lower end periphery of the assembly 10 comes into contact with the bulging portion 81b so that the assembly 10 can be arranged in the arrangement space 80a.

  In the center of the first movable mold 82, an interference avoidance space 80b that avoids interference with the impeller 7 in a mold closed state is formed so as to penetrate vertically, and the opening surface is formed on the dividing surface 82a of the first movable mold 82. A first annular groove 21c for forming the first groove groove 21 and the outer portion of the first groove groove 21 at the end edge portion 20a is projected.

  The assembly 10 is arranged in the arrangement space 80a, and the first molding die 8 is closed with the peripheral wall 30b, the bulging portion 81b, the molding surface 81a, and the first annular protrusion 82c. A first cavity 11a is formed, and a thermoplastic resin is injected and filled into the first cavity 11a so that the first divided body 2a is injection-molded and the partition wall 3 is insert-molded into the first divided body 2a. It has become.

  The second divided body 2b is injection molded by the second mold 9.

  As shown in FIG. 3, the second molding die 9 includes a second fixed die 91 and a second movable die 92 disposed so as to face the second fixed die 91 so as to be able to advance and retreat.

  On the split surface 91a of the second fixed mold 91, a molding surface 91b for molding the back surface of the second split body 2b, the second concave groove 22 and the second concave groove 22 at the opening edge 20b. A second annular protrusion 91c is formed so as to project the outer portion of the first protrusion.

  On the other hand, the dividing surface 92a of the second movable mold 92 is formed with a forming surface 92b for forming the surface of the second divided body 2b and the inner surface of the short cylindrical portion 25.

  Then, with the second molding die 9 closed, a second cavity 11b is formed by the molding surface 91b, the second annular protrusion 91c, and the molding surface 92b, and a thermoplastic resin is applied to the second cavity 11b. By injection filling, the second divided body 2b is injection molded.

  The second movable mold 92 is retracted with respect to the second fixed mold 91 in a state including the molded second divided body 2b, and the first divided section in which the partition wall 3 is insert-molded as shown in FIG. The first fixed die 81 including the body 2a can be slid upward.

  When the first fixed die 81 and the second movable die 92 are closed, the first and second resin introduction portions 23a and 23b are formed between the opening edge 20a and the opening edge 20b. The resin ring 24 is formed by injecting and filling the first and second resin introducing portions 23a and 23b with a thermoplastic resin, and the first divided body 2a and the second divided body 2b are connected to the resin ring. 24 to be joined.

  As mentioned above, according to Embodiment 1 of this invention, since the housing 2 of the electric water pump 1 is formed with resin, the weight of the entire electric water pump 1 can be reduced. Further, since the heat generated by the rotation of the motor 6 sequentially moves to the water in the pump chamber S2 through the partition wall 3 formed of an aluminum alloy material having a high heat dissipation property, the periphery of the motor 6 does not become high heat, and the efficiency The periphery of the motor 6 can be cooled well. Furthermore, since the rotor 6b of the motor 6 does not rotate in water, there is no load on the motor 6 due to the stirring resistance of water, and power is not wasted. In addition, since the pump chamber S2 that houses the impeller 7 and the motor chamber S1 that houses the motor 6 are completely separated by the partition wall 3, water moves between the pump chamber S2 and the motor chamber S1. Thus, the flow of water is not disturbed in the pump chamber S2, and the water can smoothly flow through the pump chamber S2 to improve the performance of the electric water pump 1.

  Further, since the peripheral wall 30b surrounds the motor 6 and the area of the partition wall 3 facing the motor 6 is increased, the partition wall 3 can absorb a lot of heat generated by the rotation of the motor 6 at a time, and the pump chamber can be efficiently made. Heat can be dissipated in the water of S2.

  Furthermore, since the partition wall 3 and the peripheral wall 30b are integrally assembled to the first divided body 2a by insert molding, the number of assembling steps can be reduced, and the sealing performance between the partition wall 3 and the first divided body 2a can be improved. .

In addition, since the opening edge portions 20a and 20b which the first divided body 2a and the second divided body 2b meet are continuously connected by the resin ring 24, between the first divided body 2a and the second divided body 2b. Sealability can be improved. Moreover, it is not necessary to prepare a separate sealing member, and the number of parts can be reduced to reduce the cost.
<< Embodiment 2 of the Invention >>
FIG. 5 shows an electric water pump 1 according to Embodiment 2 of the present invention. In the second embodiment, the partial structure on the first divided body 2a side in the electric water pump 1 and the structure of the mold corresponding thereto are different from the first embodiment, and the others are the same as the first embodiment. Only the parts different from the first embodiment will be described below.

  As shown in FIG. 5, the first divided body 2a of the second embodiment has a bottomed cylindrical shape whose other end in the cylinder center line direction is closed, and the wiring of the motor 6 is passed through the center of the bottomed portion. A through hole 2c is formed through.

  On the inner side surface of the peripheral wall portion of the first divided body 2a, an annular divided body projecting portion 2d is provided projecting substantially in the center of the first divided body 2a in the cylinder center line direction. It contacts the outer periphery of the stator 6a. And the surrounding wall 30b of Embodiment 2 is located in the partition 3 side of the said division body protrusion part 2d.

  On the other hand, a lid member 12 made of an aluminum alloy that closes the side of the anti-partition wall 3 of the motor 6 is attached to the anti-partition wall 3 side of the split protrusion 2d, and the lid member 12 has a through hole 2c. Corresponding through holes 12a are formed through.

  Moreover, as shown in FIG.6 and FIG.7, the 1st fixed type | mold 81 of Embodiment 2 becomes a shape corresponding to the surface of the 1st division body 2a of Embodiment 2 as the shape of the molding surface 81a, The lid member 12 is insert-molded into the first divided body 2 a together with the partition wall 3.

  As described above, in the second embodiment of the present invention, the same effect as in the first embodiment can be obtained, and at the same time as the first divided body 2a is molded, the entire assembly 10 is covered with the first divided body 2a. The motor 6 can be firmly protected, and in order to protect the motor 6 firmly, an operation of attaching a cover member for enclosing the assembly 10 to the first divided body 2a later is not required.

  In Embodiments 1 and 2 of the present invention, the partition wall 3 is formed of an aluminum alloy material. However, the present invention is not limited to this, and the partition wall 3 may be formed of copper or a material with high heat dissipation.

  In Embodiments 1 and 2 of the present invention, the partition wall 3 is formed integrally with the first divided body 2a by insert molding. However, after the first divided body 2a is injection molded, the partition wall 3 is formed on the first divided body 2a. It may be assembled.

  Further, the present invention is applied to the electric water pump 1 using the axial gap type motor 6, but can also be applied to the electric water pump 1 using other types of motors.

  The present invention is suitable for an electric water pump that sucks and discharges water by rotating the impeller.

DESCRIPTION OF SYMBOLS 1 Electric water pump 2 Housing 2a 1st division body 2b 2nd division body 3 Partition 5 Output shaft 6 Motor 7 Impeller 20a, 20b Opening edge part 21 1st groove groove 22 2nd groove groove 23a 1st resin introduction part 24 resin ring 30b peripheral wall S accommodating space S1 motor chamber (first partition space)
S2 Pump room (second compartment)

Claims (4)

A resin-made cylindrical housing having an accommodation space inside,
The housing space is divided into two spaces by a partition wall made of a metal with high heat dissipation. One of the partition spaces contains a motor, and the other partition space rotates integrally with the output shaft of the motor. An electric water pump characterized by containing an impeller that is fixed to a rotary shaft and sucks and discharges water by a rotating operation. In the electric water pump according to claim 1,
The electric water pump according to claim 1, wherein the partition wall has a peripheral wall that extends to the one partition space and surrounds the motor at an outer peripheral edge. In the electric water pump according to claim 1 or 2,
The housing is a joined body in which the first and second half-divided bodies divided into two in the cylinder center line direction are joined by abutting each opening edge.
The electric water pump, wherein the partition wall is insert-molded in the first divided body. The electric water pump according to claim 3,
On the opening edge of each of the first and second divided bodies, concave grooves facing each other are annularly provided over the entire circumference of the opening,
An annular resin introduction portion is formed by the both concave grooves in a state in which the opening edge portions of the first and second divided bodies are abutted with each other, and a molten resin is introduced into the resin introduction portion and solidified. Thus, the electric water pump is characterized in that both opening edge portions are joined via a resin ring.

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