KR20160118612A - Electric water pump - Google Patents

Abstract

The present invention relates to an electric water pump. The electric water pump comprises: a pump cover comprising an inlet into which cooling water flows and an outlet from which pressurized cooling water is discharged; a stator chamber in which a stator for generating a magnetic field by a control signal applied from the outside is arranged; a rotor chamber in which a rotor rotated by a magnetic field generated by the stator is arranged; a separation wall separating a space between the stator chamber and the rotor chamber; a shaft fixed on the rotor to rotate with the rotor; and an impeller fixed on a front end of the shaft to rotate with the shaft and pressurize the cooling water flowing into the inlet. A wing unit is disposed on a portion of the shaft to promote a flow of the cooling water. Cooling efficiency and performance of the water pump by the cooling water are improved.

Description

Electric water pump {ELECTRIC WATER PUMP}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water pump, and more particularly, to an electric water pump having a wing portion to facilitate the flow of cooling water.

Generally, a water pump is a device for circulating cooling water to an engine and a heater for cooling the engine and heating the room. The cooling water discharged from the water pump exchanges heat with the engine, the heater, or the radiator, circulates, and then flows back to the water pump. These water pumps are largely divided into a mechanical water pump and an electric water pump.

The mechanical water pump is connected to a pulley fixed to the crankshaft of the engine and driven in accordance with the rotation of the crankshaft (that is, the rotation of the engine). Therefore, the flow rate of the cooling water discharged from the mechanical water pump is determined according to the rotational speed of the engine. However, the flow rate of the cooling water required in the heater and the radiator is determined irrespective of the rotational speed of the engine. Accordingly, in the region where the engine speed is low, the heater and the radiator can not be normally operated, and the engine speed has to be increased to normally operate the heater and the radiator. As a result, there is a problem that the fuel efficiency of the vehicle is lowered.

The electric water pump is driven by a motor controlled by a control device. The electric water pump can determine the flow rate of the cooling water irrespective of the rotation speed of the engine and can reduce the required power of 60 ~ 70% compared with the mechanical water pump. And the application thereof to recent vehicles is increasing.

DC motors are generally used for electric water pumps, especially BLDC (Brushless DC) motors. A controller for controlling such a BLDC motor is provided together with a motor, and an electric circuit is built in the inside of the controller. As the controller operates, inherent heat is generated in each electric element, and proper cooling is required to prevent overheating.

Accordingly, the BLDC motor has a cooling water line between a stator wound with a coil and a rotor fitted with a permanent magnet. However, the spacing between the stator and the rotor should be within a few millimeters to maintain the function of the BLDC motor. Due to such spatial constraints, the flow rate of cooling water flowing between the stator and the rotor is not sufficient and the flow is also not smooth. Therefore, there is a problem that the heat generated in the electric water pump is not easily cooled.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an electric water pump having a wing for improving cooling performance by promoting cooling water flow.

In order to achieve the above object, according to an embodiment of the present invention, there is provided a pump cover including an inlet through which electric water pump cooling water is introduced and an outlet through which pressurized cooling water exits; A stator chamber in which a stator for generating a magnetic field is disposed by a control signal applied from the outside; A rotor chamber in which a rotor rotating by a magnetic field generated by the stator is disposed; A separating wall separating a space between the stator chamber and the rotor chamber; A shaft fixed to the rotor and rotated together with the rotor; An impeller fixed to a front end of the shaft to rotate together with the shaft and pressurize the cooling water introduced into the inlet; And a wing part is provided on a part of the shaft to facilitate the flow of the cooling water.

The wing portion may be provided at a front end portion or a rear end portion of the shaft.

The shaft may include a body extending axially from the center of the separating wall and an extension extending in the axial direction with a radius smaller than that of the body at the front or rear of the body, And at least one or more vanes protruding from the front or rear surface of the body portion and rotating to increase fluid flow.

The wing portion may include at least one wing protruding radially outward from a radially outer portion of the extended portion and rotating to increase fluid flow.

The at least one wing may have a shape in which the thickness of the at least one wing protrudes radially outward and the tip has a pointed shape.

Wherein the wing portion includes at least one long wing protruding radially outward from an outer circumferential surface of the extended portion; At least one blade extending radially outward from an outer circumferential surface of the extended portion, the blade having a turning radius shorter than the long blade; . ≪ / RTI >

The at least one long blade may be arranged alternately with the at least one blade.

The electric water pump may further include a stator chamber, a body including the rotor chamber, and a driver case mounted on a rear end of the body and including a fixing portion for fixing the partition wall.

The electric water pump may form a space between a rear surface of the separating wall and a front surface of the driver case.

The front end of the fixing part may be formed spaced apart from the rear surface of the separating wall.

As described above, according to the embodiment of the present invention, the wings are provided in the shaft rotating together with the rotor, thereby facilitating the flow of the cooling water flowing in the narrow space between the shaft and the separation wall. Thereby, cooling efficiency and cooling performance of the electric water pump are improved.

1 is a cross-sectional view of an electric water pump according to an embodiment of the present invention.
Fig. 2 is an enlarged configuration view of the portion "A" in Fig.
3 is a perspective view of a wing applied to an electric water pump according to an embodiment of the present invention.
4 is a cross-sectional view of a wing applied to an electric water pump according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

For convenience of description, the left side of the drawing is referred to as 'forward', 'shear', 'front end' and the like, and the right side of the drawing is referred to as 'rear', 'rear end', 'rear end' Quot;

The parts denoted by the same reference numerals throughout the specification mean the same or similar components.

1 is a cross-sectional view of an electric water pump according to an embodiment of the present invention.

An electric water pump 1 according to an embodiment of the present invention includes a pump cover 10, a body 30, a driver case 50, and a driver cover 70. A body 30 is coupled to a rear end of the pump cover 10 to form a volute chamber 14 and a rotor chamber 35. A driver case 50 is coupled to a rear end of the body 30 A stator chamber 45 is formed and a driver cover 70 is coupled to a rear end of the driver case 50 to form a driver chamber 85. [

A rotor 37 fixed to the shaft 100 is mounted in the rotor chamber 35. The impeller 17 is mounted on the rotor chamber 37, A stator 47 is mounted on the driver chamber 45 and a driver 80 is mounted on the driver chamber 85. The shaft 100 has a central axis x and the rotor 37 rotates about the central axis x together with the shaft 100. The stator 47 is disposed concentrically with the central axis x of the shaft 100.

An inlet 12 is formed at the front end of the pump cover 10 so that cooling water flows into the electric water pump 1 through the inlet 12 and an outlet 15 is formed in a side portion of the pump cover 10, Flows out through the outlet (15). An inclined surface 3 is formed at the rear end of the inlet 12 of the pump 10 and a rear end 20 of the pump cover 10 extends from the inclined surface 3 to the rear side. The rear end portion 20 of the pump cover 10 is coupled to the cover mounting portion 32 of the body 30 by a fixing means such as a bolt B or the like. The inclined surface 3 is inclined with respect to the central axis x of the shaft 100.

The pump cover 10 is formed with a bolt chamber 14 to which cooling water is pressurized and an impeller 17 for pressurizing and discharging the cooling water through the outlet 15 is formed in the bolt chamber 14, Respectively. The impeller 17 is fixed to the front end of the shaft 100 and rotates together with the shaft 100. To this end, a bolt hole 29 is formed at the center of the impeller 17, and a thread is formed on the inner circumferential surface of the bolt hole 29. The impeller 17 is fixed to the shaft 100 by screwing the impeller bolt 28 inserted into the bolt hole 29 into the front end of the shaft 100. A washer (w) may be interposed between the impeller (17) and the impeller bolt (28).

The center of the impeller 17 and the rotor 37 as the rotating element in the water pump 1 and the center of the stator 47 as the stationary element of the rotor 37 are arranged on the central axis x, The cooling water is smoothly guided, and the operating performance of the water pump 1 is improved.

The impeller (17) is divided into a plurality of spaces by a plurality of vanes (18). The cooling water flowing into the plurality of spaces is pressed in accordance with the rotation of the impeller 17. On the other hand, the cooling water flowing into the inlet 12 may be transmitted to the rotor chamber 35 through the impeller 17 as indicated by arrows in FIG.

The body 30 has a hollow cylindrical shape and is joined to the rear end of the pump cover 10. [ The body 30 includes an adapter 25, a separation wall 90, a stator chamber 45, and a rotor chamber 35 which are mounted inside the radius.

The adapter 25 supports the separating wall 90 at the rear end of the impeller 17. A bearing 31 is provided between the bearing mounting portion 26 and the shaft 100 so as to smoothly rotate the shaft 100. [ And also prevents the shaft 100 from tilting.

A through hole 27 is formed at the center of the adapter 25 so that the front end of the shaft 100 passes through the through hole 27 and protrudes into the bolt chamber 14, And the impeller 17 is fixed to the front end portion. The impeller 17 is fixed to the shaft 100 by the impeller bolt 28. The impeller 17 may be pressed into the outer diameter of the shaft 100. [

On the other hand, the adapter 25 has a connecting hole 34 formed outside the radius of the bearing mounting portion 26. The cooling water having passed through the impeller 17 is transmitted to the rotor chamber 35 through the connecting hole 34 as indicated by an arrow. On the other hand, the cooling water introduced into the rotor chamber 35 passes through the gap 5 inside the radius of the separation wall 90 and flows through the shaft 100, the rotor 37, (47) and the like. Therefore, the durability of the water pump 1 can be increased. In addition, it prevents accumulation of suspended matter contained in the cooling water in the rotor chamber (35).

The separating wall 90 is formed in a cup shape in which the impeller 17 side is opened and is interposed between the stator 47 and the rotor 37. That is, the stator 47 is disposed outside the radius of the separating wall 90, and the rotor 37 is disposed radially inward.

The separation wall 90 includes a front surface 91 forming a bolt chamber 14 with the pump cover 10 and a front surface 91 of the separation wall 90 is centered radially outward The first barrier ribs 92 and the second barrier ribs 93 are sequentially formed.

The first partition wall 92 is engaged with the rear end portion 20 of the pump cover 10. A sealing means such as an O-ring O is interposed between the first partition wall 92 and the rear end portion 20 to prevent the cooling water from leaking to the outside of the bolt chamber 14.

The second partition wall 93 protrudes rearward from the front surface 91 to define a boundary between the stator chamber 45 and the rotor chamber 35. A stator 47 is mounted outside the radius of the second partition wall 93.

The stator chamber 45 is formed on the outer periphery of the separating wall 90 and the stator 47 is mounted on the stator chamber 45. The stator 47 is directly or indirectly fixed to the body 30, and generates a magnetic field by a control signal applied from the outside.

The rotor chamber 35 is formed at an inner peripheral portion of the separating wall 90 and the rotor 60 is mounted to the rotor chamber 35 and the rotor 37 and the shaft 100 are mounted.

The support portion 60 is made of a resilient rubber material, so that the thrust of the shaft 100 is relieved from being transmitted to the bearing 31. On the other hand, when the support portion 60 is in direct contact with the bearing 31, rotation friction occurs between the bearing 31 and the rubber supporting portion 60, thereby deteriorating the performance of the water pump 1. Therefore, a thrust ring 65 may be installed between the support 65 and the bearing 31 to reduce rotational friction.

The rotor 37 is fixed to the outer peripheral portion of the shaft 100 by a method such as press fitting or welding. A permanent magnet is mounted on the rotor 37 and is rotated by a magnetic field generated by the stator 47.

The shaft 100 will be described in more detail with reference to FIGS. 2 to 4. FIG.

3 is a perspective view of a wing portion applied to an electric water pump according to an embodiment of the present invention, and Fig. 4 is a perspective view of an electric water pump according to an embodiment of the present invention. Fig. Fig.

2 to 4, the shaft 100 includes a body portion 105, an extension portion 120, and a wing portion 110. As shown in Figs. The body portion 105 extends axially along the central axis x at the center of the separating wall 93. The extension portion 120 extends in the axial direction when the body portion 105 has a smaller radius than the body portion 105 at the front or rear of the body portion 105.

At least one of the wing portions 110 may be provided on the front or rear portion of the shaft 100. The wing portion 110 is formed in a wing shape so that the shaft 100 rotates together to make a flow of the fluid. That is, the wing 110 may extend axially from the front or rear surface of the body 105 or extend radially outward from the outer surface of the extension 120.

The wing portion 110 functions as a conventional blade, and is obvious to a person skilled in the art. Accordingly, when the shaft 100 rotates, the wing 110 rotates in conjunction with the rotation of the wing 110. The kinetic energy generated when the wing 110 rotates can be transmitted to the fluid to increase the flow of the fluid. The water pump 1 can be cooled more quickly by the cooling water passing through the narrow gap 5 between the shaft 100 and the separation wall 90. [

In the present specification, the wing 110 is integrally formed at the rear end of the shaft 100. However, the present invention is not limited thereto, and the wing 110 may be formed at any position where the cooling water including the front end of the shaft 100 flows. .

3 to 4, the wing portion 110 may be formed so as to protrude from the side surface of the body portion 105 and the outer peripheral surface of the extension portion 120 according to an embodiment of the present invention, for example, . The wing 110 includes at least one long wing 111 and at least one short wing 112.

Referring to FIG. 4, each of the long wings 111 is formed so as to extend radially outwardly from the outer circumferential surface of the extending portion 120 than the respective short wings 112. Further, each of the short vanes 112 may be disposed between the respective long vanes 111.

Accordingly, when the shaft 100 is rotated, the flow change becomes larger than when the length of the long wing 111 and the length of the short wing 112 are the same. Therefore, the cooling performance can be improved.

Meanwhile, each of the long wings 111 and the short wings 112 may be formed to have a thin shape and a sharp tip while extending radially outward. Therefore, the side surfaces of each of the long wings 111 and the respective short wings 112 are curved, and the shaft 100 can be rotated to increase the flow of the cooling water in a state in which the rotation resistance is not greatly increased. have.

The driver case 50 is coupled to the rear end of the body 30 and the driver case 50 is coupled to the body 30 so that the stator chamber 45 is formed in the body 30. As shown in FIG. 2, the driver case 50 includes a first fixing part 51 and a second fixing part 52 protruding forward to support the separation wall 90. A part of the separation wall 90 is inserted and fixed between the first fixing part 51 and the second fixing part 52.

At this time, spacing spaces D1, D2, and D3 are formed between the rear surface of the separation wall 90 and the front surface of the driver case 50. That is, between the rear end surface of the separation wall 90 and the front end surface of the driver case 50, between the rear surface of the separation wall 90 and the front end of the first fixing portion 51, D2, and D3 are formed between the rear surface of the second fixing portion 51 and the front end of the second fixing portion 51, respectively. These spacing spaces D1, D2 and D3 prevent the axial vibration due to the thrust of the shaft 100 from being transmitted to the driver 80 disposed behind the driver case 50. [

The driver cover 70 is formed in a disk shape at a predetermined distance from the driver case 50 in the axial direction. The driver cover 70 is coupled to the driver case 50 by a coupling means such as a bolt to form a driver chamber 85 between the driver case 50 and the driver cover 70. A sealing means such as an O-ring (O) is provided at the radially outer end of the driver cover (70) to prevent dust or the like from entering the driver chamber (85).

A driver 80 for controlling the operation of the water pump 1 is mounted in the driver chamber 85. The driver 80 includes a microprocessor and a printed circuit board (PCB), and is electrically connected to an external controller (not shown) to receive a control signal of the controller.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

Claims (10)

A pump cover including an inlet through which cooling water flows;
A stator chamber in which a stator for generating a magnetic field is disposed by a control signal applied from the outside;
A rotor chamber in which a rotor rotating by a magnetic field generated by the stator is disposed;
A separating wall separating a space between the stator chamber and the rotor chamber;
A shaft fixed to the rotor and rotated together with the rotor;
An impeller fixed to a front end of the shaft to rotate together with the shaft and pressurize the cooling water introduced into the inlet;
, ≪ / RTI &
Wherein a portion of the shaft is provided with a wing portion to facilitate the flow of cooling water.
The method according to claim 1,
Wherein the wing portion is provided at a front end portion or a rear end portion of the shaft.
3. The method of claim 2,
The shaft
A body extending axially from a center of the separating wall;
An extension extending in the axial direction and having a smaller radius than the body at the front or rear of the body;
Lt; / RTI >
The wing
And at least one wing protruding from a front portion or a rear portion of the body portion and rotating to increase fluid flow.
3. The method of claim 2,
The wing
And at least one wing protruding radially outward from a radial outer periphery of the body or extension and rotating to increase fluid flow.
5. The method of claim 4,
Wherein at least one of the at least one blades protrudes radially outward and has a thinner thickness and a sharp tip.
5. The method of claim 4,
The wing
At least one long blade projected radially outward from an outer peripheral surface of the extended portion;
At least one blade extending radially outward from an outer circumferential surface of the extended portion, the blade having a turning radius shorter than the long blade;
And an electric water pump.
The method according to claim 6,
Wherein the at least one long wing is disposed at least alternately with the at least one wing.
5. The method of claim 4,
A stator chamber, a body including the rotor chamber;
A driver case mounted on a rear end of the body and including a fixing part protruding forward to fix the separating wall;
And an electric water pump.
9. The method of claim 8,
And a spacing space is formed between the rear surface of the separating wall and the front surface of the driver case.
10. The method of claim 9,
Wherein a front end portion of the fixing portion is spaced apart from a rear surface of the separating wall.

Images