KR102027834B1 - Electric water pump - Google Patents

Abstract

An electronic water pump mounted on a vehicle and capable of transferring a fluid such as cooling water is disclosed. An electronic water pump according to the present invention includes a main body formed with an inlet and an outlet; a stator assembly mounted inside the housing of the main body to form a rotating magnetic field when electricity is supplied; And an impeller assembly rotatably assembled in the center of the stator assembly and rotated by the rotating magnetic field to suck cooling water from the inlet and discharge it to the outlet, wherein the stator assembly is formed in a double cylindrical shape. An inner core having a cylindrical portion and an outer cylindrical portion connected radially at regular angles by a connecting portion, wherein the outer cylindrical portion is cut by the cut portion at predetermined angles, and each connected to the inner cylindrical portion by the connecting portion; A fixed shaft fixed to the center of the inner cylindrical portion; A stator body coupled to the inner core by insert injection to allow winding and fusing to form the rotating magnetic field; A connector having an upper end of the fixed shaft inserted into an upper end of the stator body, and electrically connecting the winding and the PCB on the upper side of the stator body; And an outer core made of a cylindrical shape having a height similar to that of the inner core and press-fitted to an outer surface of the inner core.

Description

Electronic water pump {Electric water pump}

The present invention relates to an electronic water pump mounted on a vehicle and capable of transferring a fluid such as cooling water.

In general, a vehicle drives the engine to obtain driving power, and thus, the engine temperature must be maintained in a predetermined temperature range by treating heat obtained as a by-product of engine driving. The engine cooling method is air-cooled and water-cooled, but except for special vehicles to use a water-cooled cooling system that is realistically stable. The water-cooled engine is provided with a water pump so that the coolant circulates through the water jacket formed in the engine to cool the engine.

Currently, the development direction of the vehicle is focused on the environment-friendly, high efficiency and high fuel consumption vehicles, in order to achieve this goal, the motorization of automotive parts is being made. In order to circulate the coolant in the engine and the heater for the cooling system and the indoor heating of the automobile engine, research is being actively conducted for the motorization of the water pump, which is a key component.

The coolant discharged from the water pump performs heat exchange with the engine, the heater, or the radiator, circulates, and then flows back into the water pump. These water pumps are largely divided into mechanical water pumps and electric water pumps.

As the mechanical water pump is connected to the pulley and belt fixed to the crankshaft of the engine and driven by the rotation of the crankshaft, that is, the rotational driving force of the engine, the flow rate of the coolant discharged from the mechanical water pump depends on the rotational speed of the engine. do. By the way, the flow volume of the cooling water required by a heater and a radiator is determined irrespective of the rotation speed of an engine. Therefore, the heater and the radiator did not operate normally in the region where the engine speed was low, and the engine speed had to be increased to operate the heater and the radiator normally. This caused a problem that the fuel economy of the vehicle falls. In addition, since the mechanical water pump is driven together with the rotation of the engine, it is impossible to arbitrarily control the engine cooling in an optimal state, increase the engine load, reduce the fuel efficiency of the entire vehicle, and make the structure around the engine complicated and bulky. There was a problem.

Accordingly, an electronic water pump was developed to improve the problems of the mechanical water pump. Unlike the mechanical water pump, the electronic water pump is a power source that is a battery, and is driven by a motor whose power supply is controlled by a controller. There is an advantage that can determine the flow rate of the cooling water irrespective of the rotational speed. However, since the parts used in the electronic water pump are electrically operated, it is important to ensure that the electrically operated parts have sufficient waterproof performance, and it is important to ensure sufficient waterproof performance to increase the performance and durability of the electronic water pump. It is becoming.

The electronic water pump is formed with an inlet through which the coolant is introduced and an outlet through which the coolant is discharged, and basically includes an impeller rotatably provided therein and an electric motor provided inside the case to rotate the impeller.

At this time, when the electric motor is a DC motor, the rotating shaft of the DC motor and the impeller shaft coupled to the impeller are engaged and rotated, and the impeller shaft is rotated and supported by a bearing like a mechanical water pump, thereby using an electronic motor using a DC motor. The water pump is disadvantageous in that the volume of the DC motor and the impeller shaft is bulky, and a separate sealing or bypass line is required to prevent cooling water from invading into the bearing.

In order to convert the electronic water pump into a compact and optimized configuration, the electric motor uses a BLDC motor, a shaft is fixed to the inner center of the motor case, a stator and a rotor are installed, and an impeller is inserted into the rotor together with injection molding. Therefore, an electronic water pump has been developed, which is rotatably inserted into a shaft and configured to rotate an impeller by rotation of a rotor.

However, since the electronic water pump according to the prior art has a structure in which a rotor and impeller-integrated insert injection molding is rotated by being inserted into a fixed shaft, its structure is complicated and difficult to assemble, and the inner diameter surface in contact with the shaft is rotated at high speed. Deterioration is easily scratched or damaged, there was a problem that the metering pumping is difficult as the rotation center is finely twisted due to thermal expansion and durability is reduced.

Registered Patent No. 1054323

An object of the present invention is to solve this problem, to provide a simple assembly structure and to provide an electronic water pump that ensures sufficient waterproof performance with such a structure, while maintaining its durability even at high speed rotation for a long time.

As a specific means for achieving the above object, the present invention, the inlet and outlet is formed body; A stator assembly mounted inside the housing of the main body to form a rotating magnetic field when electricity is supplied; And an impeller assembly rotatably assembled in the center of the stator assembly and rotated by the rotating magnetic field to suck cooling water from the inlet and discharge it to the outlet, wherein the stator assembly is formed in a double cylindrical shape. An inner core connected to the cylindrical portion and the outer cylindrical portion radially at every predetermined angle by the connecting portion, wherein the outer cylindrical portion is cut by the cutting portion at every predetermined angle, and respectively connected to the inner cylindrical portion by the connecting portion; A fixed shaft inserted into the stator body when the stator body is injected into the center of the inner cylindrical part; A stator body coupled to the inner core by insert injection to allow winding and fusing to form the rotating magnetic field; A connector assembled to an upper end of the stator body to which an upper end of the fixed shaft is fixed, and electrically connecting the winding and the PCB on the upper side of the stator body; And an outer core formed in a cylindrical shape having a height similar to that of the inner core, and pressed into the outer surface of the inner core, wherein the stator body may have a shape corresponding to a flow path shape formed in the lower cover of the main body.

As another specific means for achieving the above object, the present invention, the inlet and outlet is formed body; A stator assembly mounted inside the housing of the main body to form a rotating magnetic field when electricity is supplied; And an impeller assembly rotatably assembled in the center of the stator assembly and rotated by the rotating magnetic field to suck cooling water from the inlet and discharge it to the outlet, wherein the impeller assembly has a cylindrical shape to form a skeleton. ; A magnet formed in a shorter length than the rotor core and spaced apart from the outer surface of the rotor core vertically at a predetermined angle; Injection molded to surround the space between the rotor core and the magnet and the inside and outside, rotatably inserted into a fixed shaft provided in the stator assembly, and has a spiral wing at one end to suck the fluid into the inlet and then the outflow And an impeller body that is rotated to be discharged to a sphere, wherein the impeller body has a shape of a rotation shaft support part rotatably in a fixed shaft provided in the stator assembly, and a foreign object discharge part having a groove shape so as to be discharged when foreign materials enter the rotation shaft support part. It can be formed along.

At this time, the main body, the upper and lower housing opening; An upper cover assembled to seal an upper portion of the housing and equipped with an air vent mechanism for releasing air inside the housing; And a lower cover assembled to seal the lower part of the housing and having the inlet and the outlet formed therein, wherein the upper cover is made of a different material from the housing or the lower cover, and has a heat transfer rate greater than that of the housing or the lower cover. And a flange for assembling is formed on the outer surface of the housing and the lower cover, respectively, and a flange is formed on the outer surface of the stator assembly to be interposed between the housing and the flange of the lower cover, the flange of the housing Positioning protrusions or holes may be formed in the flange of the stator assembly and formed at positions corresponding to each other.

At this time, the inner core is formed on the inner surface of the inner core is inserted into the cut portion of the inner core may be pressed into the inner core outer surface.

In this case, the impeller body is integrally formed with the rotor core and the magnet by primary and secondary injection to form the impeller assembly, but the rotor core and the end of the magnet are aligned to be positioned at the same height. After the primary injection is made by the length of the magnet, the remaining portion including the spiral blade may be made by secondary injection.

In this case, a serration junction may be formed at the interface between the first injection and the second injection.

In this case, in the first injection, the impeller body outer side may be formed by the magnet length, and the inner side may be formed shorter than that by the second injection.

At this time, the fixing shaft of the stator assembly may be inserted and supported by the inner hole of the impeller body formed by the secondary injection.

At this time, the inner hole may be formed along the longitudinal direction of the foreign material discharge portion of the groove shape for discharging the foreign material.

At this time, the impeller body may be formed in the disk in a vertical direction with respect to the axial direction, the spiral blade is formed in the disk around the axial direction, a closed disk covering the spiral blade may be formed.

According to the present invention as described above has the following advantages.

(1) The present invention provides a simple structure in which the stator assembly, the impeller assembly, and the housing are assembled, so that assembly can be performed smoothly and productivity can be improved.

(2) The present invention can realize a durable assembly form by applying the insert injection or the first and second injection to the stator assembly and the impeller assembly difficult to implement an integral form of the injection molding.

1 is a perspective view as seen from the top of the electronic water pump according to the present invention.
Figure 2 is a perspective view from the bottom of the electronic water pump according to the present invention.
3 is an exploded perspective view as viewed from the bottom of the electronic water pump according to the present invention.
Figure 4 is an exploded perspective view seen from the top of the electronic water pump according to the present invention.
5 is a cross-sectional view of the electronic water pump according to the present invention.
Figure 6 is a perspective view showing the type of impeller blades that are some components of the electronic water pump according to the present invention.
7 is an exploded perspective view of a fixed shaft wine core which is a component of the electronic water pump according to the present invention.
8 is a perspective view showing before and after the stator body injection of the stator assembly which is a part of the electronic water pump according to the present invention.
9 is an exploded perspective view of a connector of a stator assembly which is a part of an electronic water pump according to the present invention.
10 is an exploded perspective view of the outer core of the stator assembly which is a part of the electronic water pump according to the present invention.
11 is a perspective view of a stator assembly which is a component of the electronic water pump according to the present invention.
12 is a process perspective view showing a primary injection for manufacturing an impeller assembly which is a component of an electronic water pump according to the present invention.
13 is a plan view after the first injection of the impeller assembly which is a part of the electronic water pump according to the present invention.
14 is a cross-sectional view of an impeller assembly which is a component of the electronic water pump according to the present invention.
15 is a plan view of an impeller assembly which is a part of the electronic water pump according to the present invention.
16 is an exploded perspective view of a housing and a stator assembly which are some components of the electronic water pump according to the present invention.
17 and 18 are an exploded perspective view and a plan view showing the assembly of the stator body and the lower cover which are some components of the electronic water pump according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

In this specification, terms such as "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof. In addition, when a part such as a layer, film, region, plate, etc. is said to be "on" another part, this includes not only when the other part is "right on" but also another part in the middle. Conversely, when a part such as a layer, film, region, plate, etc. is "below" another part, this includes not only the other part "below" but also another part in the middle.

Hereinafter, an electronic water pump according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The electronic water pump 1 according to the first embodiment of the present invention basically applies the principle of the BLDC motor, and smoothly transfers the coolant as a fluid by rotating the impeller by supplying electricity. Unlike the mechanical water pump, the electronic water pump 1 has an advantage of supplying electricity to transfer fluid at a desired speed at a desired time.

1 to 16, the electronic water pump 1 includes a main body 10, a stator assembly 30, and an impeller assembly 40.

3 and 5, the main body 10 is formed with an inlet 12a and an outlet 12b. The stator assembly 30 and the impeller assembly 40 are mounted inside the main body 10.

In this case, referring to FIGS. 1 to 5, the main body 10 is assembled to seal the upper and lower housings 11 and the upper part of the housing 11, and the air inside the housing 11 is evacuated. And an upper cover 13 on which the air vent mechanism 20 is mounted, and a lower cover 12 assembled to seal the lower portion of the housing 11 and having the inlet 12a and the outlet 12b formed therein.

In this case, referring to FIG. 5, the main body 10 is open because the inlet 12a and the outlet 12b are formed toward the impeller assembly 40, but the housing 11 is the upper cover 13. And the lower cover 12 are assembled with the O-rings 14-16, so that the coolant can only penetrate to the center hole of the stator assembly 30, and soak out of the stator body 33. It cannot be.

At this time, the upper cover 12, referring to Figures 1, 4, 5, made of a different material than the body 10 or the lower cover 12, than the housing 11 or lower cover 12 It may be made of a material having a higher heat transfer rate.

At this time, adjacent to the upper cover 12 is provided with a component that generates heat during operation, such as the PCB 50, to facilitate the discharge of heat to the top by heat transfer. In addition, the upper cover 12 has a heat dissipation structure that maximizes heat transfer by increasing a contact area protruding in a tooth shape in a number of projections.

At this time, the upper cover 13 is formed with a flange (13a) on the outside, it is assembled with the flange (11a) of the housing (11).

At this time, in the housing 11 and the lower cover 12, referring to Figure 1, the assembling flanges 12c are formed on the outer surface, respectively, coupled, the flange 33f is also in the stator assembly 30 It is formed and coupled between the body 10 and the flange 12c of the lower cover 12 are coupled.

When the stator assembly 30 is fastened and assembled together between the housing 11 and the lower cover 12, the stator assembly 30 may have a solid durability as if the stator assembly 30 is integrally assembled with the main body 10.

In this case, referring to FIG. 16, the positioning protrusion 11c corresponds to the flange 11a of the housing 11, and the positioning hole 33g corresponds to the flange 33f of the stator assembly 30. It is formed at the position to be combined. By the configuration of the positioning projection 11c and the hole 33g, the stator assembly 30 can be assembled at a clear position.

3 to 11, the stator assembly 30 is mounted inside the main body 10 to form a rotating magnetic field when electricity is supplied to the inner core 32 and the fixed shaft 31. , A stator body 33, a connector 60, and an outer core 34.

7, the inner core 32 is a member forming a skeleton, and has a double cylindrical shape, and the inner cylindrical portion 32a and the outer cylindrical portion 32b are radially connected at regular angles ( 32c), the outer cylinder portion 32b is cut by the cutting portion 32d at the predetermined angle, and is connected to the inner cylinder portion 32a by the connecting portion 32c, respectively.

At this time, all surfaces except the outer surface of the outer cylindrical portion 32b of the inner core 32 are molded by the stator body 33 so as not to be exposed to the outside.

5 and 7, the fixed shaft 31 is fixed to the center of the inner cylindrical portion 32a.

In this case, referring to FIG. 5, the fixed shaft 31 is fixed at the time of injection molding to the stator body 33, and the stator body 33 is also fixed to the housing 11. 31 constitutes a central axis for maintaining a fixed state.

Referring to FIG. 8, the stator body 33 is coupled to the inner core 32 by insert injection to allow winding and fusing to form the rotating magnetic field.

At this time, the stator body 33 is manufactured as shown in the upper part of FIG. 8 by insert injection in a state where the inner core 32 and the fixed shaft 31 are arranged as shown in FIG. Only 33 is shown. Here, the stator body 33 is manufactured by injection molding, and since the inner core 32 is formed in a shape that surrounds the inner core 32, the part having the inner core 32 appears as a cavity 33c, and the inner core 32. ), It has an outer cylindrical part 33b and an inner cylindrical part 33a, and the fixed shaft 31 is fixed to the upper end part.

At this time, since the stator body 33 has the above-described structure, it is difficult to manufacture a general injection path together with the inner core 32 and is molded by insert injection.

9 to 11, the upper end of the stator body 33 is fixed to the upper end of the fixed shaft 31 is assembled to the upper portion of the winding and the stator body 33 The PCB 50 is electrically connected.

At this time, the connector 60 transfers the power provided by connecting the winding wound on the stator body 33 to the PCB 50 to the stator body 33.

At this time, referring to Figure 9, the upper end of the stator body 33 is made of a cylindrical shape, the coupling protrusions 33e of different sizes are formed on the side of the upper end, and the coupling protrusion 33e on the connector 60 The coupling groove into which is inserted is formed and assembled at the corresponding position. Since the two coupling protrusions having different sizes are inserted into two coupling grooves, the positions are always assembled at the same position.

Referring to FIG. 10, the outer core 34 has a cylindrical shape having a height similar to that of the inner core 32, and is pressed into an outer surface of the inner core 32.

At this time, since the outer surface of the inner core 32 is exposed from the stator body 33, when the outer core 34 is assembled, the outer core 34 and the inner core 32 are in close contact with each other.

At this time, the inner core (34) inner surface is formed with an inner projection (34a) is inserted into the cutout portion 32d of the inner core 32 is pressed into the outer surface of the inner core (32).

12 to 15, the impeller assembly 40 is rotatably assembled in the center of the stator assembly 30 and rotated by the rotating magnetic field so as to suck the coolant from the inlet 12a to the outlet ( 12b).

At this time, the impeller assembly 40, the rotor core 41 is formed in a cylindrical shape to form a skeleton, and formed shorter than the rotor core 41 and spaced apart from the outer surface of the rotor core 41 vertically at a predetermined angle And injection molding to surround the space between the rotor core 41 and the magnet 42 and the inner and outer sides, and are rotatable on the fixed shaft 31 provided in the stator assembly 40. It has a spiral blade (40a) is inserted into one end includes an impeller body 43 is rotated so that the fluid is sucked into the inlet (12a) and then discharged to the outlet (12b).

At this time, the impeller body 43 is integral with the rotor core 41 and the magnet 42 by primary and secondary injection to form the impeller assembly 40, but the rotor core 41 and the The first injection is made by the length of the magnet 42 in a state where the ends of the magnets 42 are positioned at the same height as each other, and then the second part including the spiral blades 40a is secondly injected.

At this time, serration junction portions 43a and 43b are formed at the interface between the first injection and the second injection.

In this case, in the first injection, the outer side of the impeller body 43 is formed by the length of the magnet 42, and the inner side is formed shorter than the second injection.

At this time, the fixing shaft 31 of the stator assembly 30 is inserted and supported by the inner hole 40c of the impeller body 43 formed by the secondary injection.

In this case, a foreign material discharge portion 40d having a groove shape for discharging the foreign material is formed in the inner hole 40c along the longitudinal direction.

At this time, referring to Figure 6 (b), another embodiment of the impeller body 40 'is shown. The impeller body 40 'is formed with a disc in a direction perpendicular to the axial direction, the spiral blade 40a' is formed in the disc around the axial direction, and a closed disc 40c 'covering the spiral wing. ) May be formed.

Meanwhile, referring to FIG. 1, it can be seen that the housing 11 of the electronic water pump 1 is assembled by the upper and lower covers 12 and 13. Upper and lower covers 12 and 13 are assembled with the housing 11 by flange bolts, respectively. Here, the upper cover 13 is made of a structure and material that is favorable for heat dissipation.

Referring to FIG. 2, the inlet 12a and the outlet 12b are shown formed in the lower cover 12. The coolant flowing in the central vertical direction is discharged by bending the direction vertically through the outlet 12b formed horizontally on the side surface.

Referring to FIG. 3, the direction in which the internal components are assembled is shown in a state where the upper and lower parts are inverted. Here, it can be seen that each coupling portion has O-rings 14 and 15 for sealing. In particular, it can be seen that only the stator assembly 30 and the impeller assembly 40 are assembled within the main body 10.

Referring to FIG. 4, it can be seen that the upper cover 13 is assembled. The PCB 50 is assembled inside the upper cover 13, and the assembly located at the bottom is assembled to be completely waterproof with the lower side.

5, it can be seen that the internal configuration of the electronic water pump 1 according to the present invention at a time, the stator body 33 is completely waterproof with the lower part, the stator body It can be seen that the impeller assembly 40 is rotated inside the 33.

Referring to FIG. 6, two embodiments of impeller assemblies 40, 40 ′ are shown. (a) shows a typical spiral winged impeller 40, and (b) shows a gloss-type impeller 40 'with the addition of one disc 40c' in addition thereto. The addition of these discs can help with quiet operation.

Referring to FIG. 7, a fixed shaft 31 and an inner core 32 are shown. The fixed shaft 31 is fixed to the center of the stator assembly body 33 and inserted into the center of the impeller assembly 40 to form a rotation center. The inner core 32 has the form of a stator coil for winding the motor.

Referring to FIG. 8, the upper figure shows the state of the stator assembly 30 after insert injection of the fixed shaft 31 and the inner core 32, and the lower figure shows the fixed shaft 31 and the inner core 32. Only pure stator body 33 is shown. Because of this structure, the stator body 33 is molded by insert injection.

Referring to FIG. 9, the connector 60 is assembled to the stator body 33. On the upper side of the stator body 33, protrusions 33e having different sizes are formed, and grooves corresponding thereto are formed and assembled inside the connector 60, so that the assembly can be made at an accurate position.

Referring to FIGS. 10 and 11, an assembly view for finally pressing the outer core 34 into the stator assembly 30 is shown. The protrusions 34a inside the outer core 34 are press-fitted in a state where they are located at the cutout 32d. After the press-fitting, the inner core 32 and the outer core 34 are in close contact with each other.

12 and 13, it can be seen that the rotor core 41 and the magnet 42 are assembled by primary injection molding. Injection molding is performed in a state where a plurality of divided magnets 42 are arranged to be spaced apart from the rotor core 41 outside. The state after the injection molding can be seen in FIG. 13. Between the rotor core 41 and the magnet 42 is filled by injection molding.

Referring to Figure 14, it can be seen that the appearance of the impeller assembly 40 by the first and second injection molding. After the primary injection molding, only the length of the magnet 42 is injection molded, wherein the inner side 40e is shorter than the injection molding. Then, serration junctions 43a and 43b are formed for secondary molding. That is, the cross section is processed into a tooth shape or a curved shape, and the second injection molding is performed. By this serration junction part 43a, 43b, the 1st and 2nd injection molding part is firmly joined. The secondary molded part is also provided with a spiral blade 40a, an inlet 12a and an outlet 12b, and a hole 40c for supporting the inner fixed shaft 31.

Referring to FIG. 15, the spiral vanes 40a of the impeller assembly 40 and the central hole 40c of the disc 40b are shown, and the foreign material ejecting portion 40d is also shown on the side of the hole 40c. have.

Referring to FIG. 16, the positioning groove 33g and the projection 11c are formed to assemble the stator assembly 30 at the correct position of the housing 11. By this positioning projection and groove, the stator assembly 30 can be assembled and fixed at the correct position of the housing 11.

Referring to FIGS. 17 and 18, it can be seen that the stator body 30 has a shape corresponding to a flow path shape formed in the lower cover 12 of the main body 10.

As shown, the stator body 30 is coupled to the lower cover 12 to form a flow path for guiding the flow of the fluid by the rotation of the impeller to the outlet 12b0, but after assembling each other, In other words, a straight guide 12e for guiding to the protruding spiral guide 12d and the last outlet 12b is protruded in the vicinity of the outer portion of the lower cover 12. The spiral guide 33h and the linear guide 33i are formed to match the stator body 30, that is, to correspond to each other. There is no need to put the guide cover.

The operation of the electronic water pump 1 according to the present invention is as follows.

First, referring to FIG. 5, when power is applied through the PCB 50, a control signal is generated as programmed in the PCB 50, and electricity is statored through the connector 60 according to the signal. Provided to the assembly 30.

When power is supplied to the stator assembly 30, a rotating magnetic field is formed around the stator assembly 30, and the impeller assembly 40 rotates about the fixed shaft 31 according to the principle of the motor.

When the impeller assembly 40 is rotated, the coolant is sucked into the inlet 12a and discharged to the outlet 12b by the spiral blade 40a. This operation is performed in an instant, and since the amount of cooling water to be transferred is determined according to the power supply provided, the amount of cooling water is ultimately determined by the control signal of the PCB 50.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments set forth herein, and those skilled in the art who understand the spirit of the present invention, within the scope of the same idea, the addition of components Other embodiments may be easily proposed by changing, deleting, adding, and the like, but this will also fall within the spirit of the present invention.

1: electronic water pump
10: main body 11: housing
12: lower cover 13: upper cover
30: stator assembly 31: fixed shaft
32: inner core 33: stator body
34: outer core 40: impeller assembly
41: rotor core 42: magnet
43: impeller body 50: PCB
60 connector

Claims (3)

A body formed with an inlet and an outlet;
A stator assembly mounted inside the housing of the main body to form a rotating magnetic field when electricity is supplied;
And an impeller assembly rotatably assembled in the center of the stator assembly and rotated by the rotating magnetic field to suck cooling water from the inlet and discharge it to the outlet.
The stator assembly,
It is made of a double cylindrical shape, the inner cylindrical portion and the outer cylindrical portion is connected radially by the connecting portion at a predetermined angle, the outer cylindrical portion is cut by the incision at a predetermined angle, each connected to the inner cylindrical portion by the connecting portion core;
A fixed shaft inserted into the stator body when the stator body is injected into the center of the inner cylindrical part;
A stator body coupled to the inner core by insert injection to allow winding and fusing to form the rotating magnetic field;
A connector assembled to an upper end of the stator body to which an upper end of the fixed shaft is fixed, and electrically connecting the winding and the PCB on the upper side of the stator body;
An outer core formed of a cylindrical shape having a height similar to that of the inner core and press-fitted to the inner core outer surface;
Including,
The stator body is made of a shape corresponding to the flow path shape formed on the lower cover of the main body,
The upper end of the stator body is made of a cylindrical shape, the coupling protrusions of different sizes are formed on the side of the upper end, and the coupling groove into which the coupling protrusion is inserted is formed and assembled in the connector,
The inner core is formed on the inner core inner projection is inserted into the cut portion of the inner core is an electronic water pump pressed into the outer surface of the inner core. A body formed with an inlet and an outlet;
A stator assembly mounted inside the housing of the main body to form a rotating magnetic field when electricity is supplied;
And an impeller assembly rotatably assembled in the center of the stator assembly and rotated by the rotating magnetic field to suck cooling water from the inlet and discharge it to the outlet.
The impeller assembly,
A rotor core consisting of a cylinder to form a skeleton;
A magnet formed in a shorter length than the rotor core and spaced apart from the outer surface of the rotor core vertically at a predetermined angle;
Injection molded to surround the space between the rotor core and the magnet and the inside and outside, rotatably inserted into a fixed shaft provided in the stator assembly, and has a spiral wing at one end to suck the fluid into the inlet and then the outflow An impeller body rotated to be discharged into a sphere;
Including,
The impeller body has a rotation shaft support portion rotatably formed on the fixed shaft provided in the stator assembly, and the foreign object discharge portion in the form of a groove is formed along the longitudinal direction so as to be discharged when foreign matter enters the rotation shaft support portion.
The impeller body is integrally formed with the rotor core and the magnet by primary and secondary injection to constitute the impeller assembly, but the length of the magnet in a state where the rotor core and one end of the magnet are aligned at the same height as each other As long as the first injection is made, the remaining part including the spiral blade is second injected, and a serration junction is formed at the interface between the first injection and the second injection, and the impeller in the first injection The outer side of the body is formed by the length of the magnet, the inner side is formed shorter than that formed by the secondary injection, the fixed shaft of the stator assembly is inserted by the inner hole of the impeller body formed by the secondary injection Is supported, the inner hole is a foreign material discharge portion of the groove shape for foreign material discharge Electronic water pump formed along the length direction. The method according to claim 1 or 2,
The main body,
Upper and lower housings;
An upper cover assembled to seal an upper portion of the housing and equipped with an air vent mechanism for releasing air inside the housing;
A lower cover assembled to seal a lower portion of the housing and having the inlet and the outlet formed therein;
Including,
The upper cover is made of a material different from that of the housing or the lower cover, and is made of a material having a higher heat transfer rate than the housing or the lower cover, and flanges for assembly are respectively formed on the outer surface and coupled to the housing and the lower cover. The flange is also formed in the stator assembly and is interposed between the housing and the flange of the lower cover, and is coupled to the flange of the housing and the flange of the stator assembly. Electronic water pump.

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