Electric water pump

Abstract

The utility model relates to an electric water pump, which comprises a lower shell, an upper shell and an upper shell, an upper case coupled to the upper side of the lower case, the inner side of the upper case extending to form an upper support portion; an impeller which is inserted into an internal space formed by the coupling of the lower housing and the upper housing, and to which a thrust plate is coupled; and a rotor integrally formed with the impeller. And a thrust plate configured such that the upper side is supported by the upper support portion and the lower surface is supported by the upper end of the shaft, so that the impeller and the rotor are supported on both sides in the central axis direction, thereby minimizing a friction force between members that are in contact with each other and rotate relative to each other, thereby making it possible to improve efficiency and reduce noise.

Description

Technical Field

[0001] This utility model relates to an electric water pump that uses an electric motor to drive an impeller to rotate in order to pressurize (apply pressure to an object and transport) fluid. Background Technology

[0002] A water pump is a device used to circulate cooling water to an engine or heater for engine cooling or interior heating, etc. These water pumps are mainly divided into mechanical water pumps and electric water pumps. The most commonly used water pumps are electric water pumps, which are driven by a motor controlled by a control device.

[0003] An electric water pump typically includes a housing, stator, rotor, and an impeller and impeller housing that constitute the pump unit. The stator is located inside and fixed to the housing. The rotor is located inside the stator and separated from it. The impeller is coupled to the rotor's rotating shaft. The impeller housing is coupled to the housing to cover and enclose the impeller. Furthermore, the rotor and impeller are integrally formed, with the rotor housed in a recessed space within the impeller housing, and the impeller housed inside the impeller housing. Additionally, the lower end of the shaft is fixed to the impeller housing by molding or other methods. A through-hole is formed at the center of rotation of the rotor and impeller, and a bushing is pressed into and fixed within the through-hole. The shaft is inserted into the inside of the bushing, allowing the rotor and impeller to be rotatably coupled to the shaft.

[0004] Since the impeller generates thrust in the direction of the central axis when it rotates, a retaining ring or washer is attached to the upper end of the shaft that passes through the rotor and the impeller and exposes to the impeller direction to support the upper side of the impeller. That is, it is formed as follows: the structure supports the impeller to move upward due to the upward thrust generated when the impeller rotates.

[0005] However, due to the thrust generated when the impeller rotates, the retaining ring or washer that is connected to the upper end of the shaft comes into contact with the impeller or bushing, which increases the friction, resulting in a decrease in pump efficiency and an increase in noise.

[0006] Patent document: KR 10-2021-0009955A (January 27, 2021) Utility Model Content

[0007] Problems to be solved by utility models

[0008] This invention is proposed to solve the above-mentioned problems. The purpose of this invention is to provide an electric water pump that can support the rotor and impeller on both sides in the direction of the central axis and achieve point contact between the components that are in contact with each other and rotating relative to each other in order to minimize friction.

[0009] means for solving problems

[0010] To achieve the above objectives, the electric water pump of this utility model may include: a lower housing, with a rotor receiving portion protruding downwards, the rotor receiving portion being recessed downwards from its upper surface to form a rotor receiving space; a shaft disposed inside the rotor receiving portion of the lower housing, the lower end of the shaft being fixed to the bottom of the rotor receiving portion, the shaft extending upwards; an impeller disposed on the upper side of the lower housing, a thrust plate being attached to the central portion of the impeller, the lower surface of the thrust plate being adjacent to the upper end of the shaft; and a rotor integrally formed with the impeller, the central portion of the rotor being... The lower housing has a through hole extending vertically for the shaft to be inserted into. The rotor is inserted into the rotor receiving space of the lower housing and can rotate together with the impeller. The upper housing is connected to the upper side of the lower housing. The upper housing and the lower housing are connected to form an impeller receiving space inside the space between the upper housing and the lower housing. The upper housing has an inlet for fluid to flow into the impeller receiving space and an outlet for fluid to flow out. An upper support portion is formed at the lower end of the inlet portion, which extends adjacent to the upper surface of the thrust plate.

[0011] Furthermore, the upper support portion of the upper housing may include: a plurality of brackets extending from the lower inner wall of the inlet portion toward the thrust plate side; a support mounting portion integrally formed with the lower ends of the plurality of brackets; and a support member coupled to the support mounting portion, the lower end of the support member protruding further downward than the support mounting portion, and the support member being disposed adjacent to the thrust plate.

[0012] Furthermore, at least one of the upper surface of the thrust plate and the lower surface of the support member can be formed as a curved surface convex in a direction facing each other.

[0013] Furthermore, the upper surface of the thrust plate can be formed as a plane, and the lower surface of the support member can be formed as a convex curved surface.

[0014] Furthermore, the upper surface of the thrust plate can be formed as a convex curved surface, and the lower surface of the support member can be formed as a plane.

[0015] Furthermore, the entire surface or part of the upper surface of the thrust plate can be formed as a convex curved surface.

[0016] Furthermore, the upper end of the shaft can be formed as an upwardly convex curved surface, and the lower surface of the thrust plate can be formed as a plane.

[0017] Furthermore, the thrust plate can be integrally formed with the impeller in such a way that it is embedded radially outward into the impeller.

[0018] Furthermore, the thickness of the central portion of the thrust plate can be greater than the thickness of the portion embedded in the impeller.

[0019] Furthermore, the thrust plate may have a through hole extending through the upper and lower surfaces. The through hole may be positioned corresponding to the through hole of the rotor and may be positioned radially outward from the center of the thrust plate.

[0020] Furthermore, when the impeller rotates, a portion of the fluid flowing in from the inlet can flow downwards along the space between the impeller and the lower housing and between the rotor and the lower housing on the fluid discharge side of the impeller, then flow upwards along the space between the rotor and the shaft, and flow to the fluid inlet side of the impeller through the connecting hole of the thrust plate.

[0021] Furthermore, the shaft may include: a fixed shaft extending in the vertical direction; and a fixing plate integrally formed with the fixed shaft in a manner perpendicular to the lower end of the fixed shaft. The fixing plate may be embedded in and fixed to the bottom of the rotor housing.

[0022] In addition, a bushing can be inserted and fixed in the through hole of the rotor, and the shaft can be inserted into the inside of the bushing.

[0023] Furthermore, the bushing can be formed as a single body with a length longer than its outer diameter in the vertical direction, and the bushing can be disposed in the region from the upper side to the lower side of the rotor.

[0024] In addition, the electric water pump may also include: a motor housing, which is coupled to the lower side of the lower housing; and a stator, which is disposed inside the motor housing and fitted into the outside of the rotor receiving portion of the lower housing.

[0025] Utility Model Effect

[0026] The electric water pump of this invention has the advantages of improving efficiency and reducing noise by supporting the impeller and rotor on both sides of the central axis and minimizing the friction between the parts that are in contact and rotating relative to each other. Attached Figure Description

[0027] Figures 1 to 3 This is an assembled perspective view, an exploded perspective view, and a front sectional view of an electric water pump according to an embodiment of the present invention.

[0028] Figure 4 This is a perspective view showing the thrust plate in an electric water pump according to an embodiment of the present invention.

[0029] Figure 5 and Figure 6This is a front sectional view showing another embodiment of the thrust plate and support member in an electric water pump according to an embodiment of the present invention.

[0030] Figure 7 This is a front sectional view showing another embodiment of the bushing in an electric water pump according to an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures

[0032] 100: Stator

[0033] 210: Lower shell

[0034] 211: Lower mounting slot; 212: Lower flow channel slot

[0035] 220: Rotor housing 221: Bottom

[0036] 230: Shaft 231: Fixed Shaft

[0037] 232: Fixing plate

[0038] 300: Motor housing

[0039] 400: Rotor; 410: Through hole

[0040] 430: Bushing

[0041] 500: Impeller

[0042] 510: Thrust plate; 511: Connecting hole

[0043] 600: Upper shell

[0044] 610: Entrance section; 611: Support frame

[0045] 612: Support component mounting section; 613: Support component

[0046] 620: Export Department

[0047] 630: Upper mounting slot; 632: Upper flow channel slot Detailed Implementation

[0048] The electric water pump of this utility model will now be described in detail with reference to the accompanying drawings.

[0049] Figures 1 to 3 This diagram shows an assembled perspective view, an exploded perspective view, and a front sectional view of an electric water pump according to an embodiment of the present invention. Figure 4 This is a perspective view showing the thrust plate in an electric water pump according to an embodiment of the present invention.

[0050] As shown in the figure, an electric water pump according to an embodiment of the present invention may include a lower housing 210, a shaft 230, an impeller 500 with a thrust plate 510 attached, a rotor 400, and an upper housing 600, and may also include a motor housing 300 and a stator 100.

[0051] The upper surface of the lower housing 210 is recessed downward to form a lower mounting groove 211 to accommodate a portion of the impeller 500. A lower flow channel groove 212 is recessed radially outward on the lower mounting groove 211 to allow fluid discharged from the impeller 500 to flow. The rotor receiving portion 220 is shaped to protrude downward from the center of the portion forming the lower mounting groove 211, and the rotor receiving portion 220 is recessed downward from its upper surface to form a rotor receiving space.

[0052] The shaft 230 can be disposed within the rotor housing space inside the rotor housing 220. The lower end of the shaft 230 can be engaged and fixed to the bottom 221 of the rotor housing 220, and the shaft 230 can be integrally formed with the lower housing 210 by insert injection molding. Furthermore, the shaft 230 may include a fixed shaft 231 and a fixing plate 232, the fixed shaft 231 extending in the vertical direction, and the fixing plate 232 being integrally formed with the lower end of the fixed shaft 231 in a manner perpendicular to the lower end of the fixed shaft 231. In addition, the shaft 230 can be insert-molded with the lower end of the fixed shaft 231 and the fixing plate 232 embedded in the bottom 221 of the rotor housing 220. Therefore, the shaft 230 is fixed to the rotor housing 220 only at its lower end, while the upper end can be a free end. Furthermore, the upper end of the shaft 230 can be formed into an upwardly convex curved surface or a spherical shape.

[0053] The impeller 500 is used to compress fluid by rotation. The impeller 500 may include an upper plate, a lower plate, and blades, with multiple blades circumferentially spaced between the upper and lower plates. Furthermore, an opening is formed on the upper central portion of the impeller 500, through which fluid flows in, and near the outer periphery of the impeller 500, fluid can be discharged. That is, the impeller can be a centrifugal impeller. Additionally, the impeller 500 may be integrally formed with the rotor 400.

[0054] The rotor 400 is disposed on the lower side of the impeller 500 and can be integrally formed with the impeller 500. The rotor 400 is inserted into the rotor receiving space inside the rotor receiving part 220. A through hole 410 extending vertically is formed in the central part of the rotor 400, and the shaft 230 can be inserted into the through hole 410. A pair of bushings 430 can be inserted and fixed in the through hole 410 of the rotor 400. The pair of bushings 430 can be spaced apart vertically. The shaft 230 is inserted into the inner side of the pair of bushings 430, so that the rotor 400 and the impeller 500 can rotate smoothly around the shaft 230.

[0055] The thrust plate 510 is integrated with the impeller 500. For example, the thrust plate 510 can be integrally formed with the impeller 500 via insert injection molding. Alternatively, the thrust plate 510 can be formed in a disc shape, integrally formed with the impeller 500 in a radially outward embedded state. Furthermore, the upper surface of the thrust plate 510 is exposed towards the opening side above the central portion of the impeller 500, and the lower surface of the thrust plate 510 is exposed towards the through-hole 410 of the rotor 400. Additionally, the upper and lower surfaces of the thrust plate 510 can be formed as planes.

[0056] The upper housing 600 is joined to the upper side of the lower housing 200. Through this joining, an impeller receiving space for accommodating the impeller 500 can be formed inside the upper housing 600 and the lower housing 200. Furthermore, an upper mounting groove 630 is formed by an upward recess on the lower surface of the upper housing 600 to accommodate a portion of the impeller 500, thereby forming an impeller receiving space 601 with the lower mounting groove 211 and the upper mounting groove 630. Additionally, an upper flow channel groove 632 is formed by a recess on the lower surface of the upper housing 600 at a position corresponding to the lower flow channel groove 212 of the lower housing 200, allowing fluid discharged from the impeller 500 to flow. The upper housing 600 has an inlet 610 for fluid inflow and an outlet 620 for fluid outflow. An inflow channel can be formed inside the inlet 610, and an outflow channel can be formed inside the outlet 620. Furthermore, the upper housing 600 is formed through the center, allowing the upper mounting groove 630 to communicate with the inflow channel of the inlet 610, and the upper flow channel groove 632 and the lower flow channel groove 212 to communicate with the outflow channel of the outlet 620. The upper housing 600 extends at the lower end of the inlet 610 to form an upper support portion adjacent to the upper surface of the thrust plate 510. The upper support portion may include multiple brackets 611, a support mounting portion 612, and a support member 613. The multiple brackets 611 extend from the lower inner wall of the inlet 610 toward the thrust plate 510, and the support mounting portion 612 is integrally formed in a state connected to the lower ends of the multiple brackets 611. The support mounting portion 612 has a groove recessed upwards from its lower end, and the support member 613 is inserted into and fixed in the groove of the support mounting portion 612. Furthermore, the support member 613 protrudes further downward than the lower end of the support member mounting portion 612, and the lower end of the support member 613 can be configured adjacent to or in contact with the upper surface of the thrust plate 510.

[0057] The motor housing 300 can be formed into a recessed container shape, or into a shape that is hollow inside and open on the top. Furthermore, the motor housing 300 can be joined to the lower side of the lower housing 210.

[0058] The stator 100 is disposed inside the motor housing 300, and the stator 100 can be engaged with the outer peripheral surface of the core in contact with the inner peripheral surface of the motor housing 300. Furthermore, the central portion of the stator 100 is formed in a vertically penetrating shape so that the stator 100 can fit into the outer side of the rotor receiving portion 220.

[0059] Therefore, the electric water pump of this invention improves rotational stability by supporting the impeller and rotor on both sides of the central axis, and minimizes the friction between the components that are in contact with each other and rotate relative to each other in the central axis direction, thereby improving the efficiency of the electric water pump and reducing noise.

[0060] Furthermore, the thickness of the central portion of the thrust plate 510 can be made thicker than the portion embedded in the impeller 500. As an example, as shown in the figure, the thrust plate 510 can be shaped such that a smaller disc protrudes upward from the central portion of a larger outer diameter disc. Therefore, the thinner radially outer portion of the thrust plate 510 is easily embedded in the impeller 500, while the thicker central portion can be supported on the upper end of the support member 613 and the shaft 230, thereby improving the structural rigidity and durability of the thrust plate 510. In addition, the thrust plate 510 can be formed in various other shapes.

[0061] Furthermore, a through hole 511 penetrating both the upper and lower surfaces may be formed in the thrust plate 510. The through hole 511 is located at a position corresponding to the through hole 410 of the rotor 400, and the through hole 511 may be formed at a position spaced radially outward from the center of the thrust plate 510. Moreover, multiple through holes 511 may be provided, and the multiple through holes 511 are arranged spaced apart from each other in the circumferential direction.

[0062] Furthermore, the impeller 500 is disposed within the impeller housing space formed by the combination of the lower housing 210 and the upper housing 600, and the rotatably disposed impeller 500 can move slightly up and down within the impeller housing space. Additionally, the rotor 400 is rotatably disposed inside the rotor housing 220, therefore a gap exists between the outer circumferential surface of the rotor 400 and the inner circumferential surface of the rotor housing 220. Similarly, a gap also exists between the lower surface of the rotor 400 and the bottom 221 of the rotor housing 220.

[0063] Therefore, when the impeller 500 rotates, a portion of the fluid flowing in from the inlet 610 of the upper housing 600 can flow downwards along the space between the impeller 500 and the lower housing 210 and between the rotor 400 and the lower housing 210 on the fluid discharge side of the impeller 500, then flow upwards along the space between the rotor 400 and the shaft 230, and finally flow through the connecting hole 511 of the thrust plate 510 to the fluid inlet side of the impeller 500. The fluid can pass through the small gap between the bushing 430 and the shaft 230, or a vertically penetrating flow channel can be formed in the part of the rotor 400 where the bushing 430 is attached, allowing the fluid to pass through. This reduces the fluid pressure difference between the upper and lower sides of the impeller, thereby reducing the generation of thrust.

[0064] Figure 5 and Figure 6 This is a front sectional view showing another embodiment of the thrust plate and support member in an electric water pump according to an embodiment of the present invention.

[0065] As shown in the figure, either the upper surface of the thrust plate 510 or the lower surface of the support member 613, which are facing each other, can be formed as a curved surface convex in the direction in which they face each other. For example, as shown... Figure 3 As shown, the upper surface of the thrust plate 510 can be formed as a plane, and the lower surface of the support member 613 can be formed as a convex curved surface. The support member 613 can be a sphere. Or, as... Figure 5 and Figure 6 As shown, the upper surface of the thrust plate 510 can be formed as an upwardly convex curved surface, and the lower surface of the support member 613 can be formed as a plane. The support member 613 can be a thrust pin. Furthermore, as... Figure 5 As shown, the upper surface of the thrust plate 510 can be a convex shape, or as... Figure 6 As shown, it can be formed into a curved surface with a portion of its surface protruding. In addition, the upper end of the shaft 230 can be formed into a curved surface that protrudes upwards, and the lower surface of the thrust plate 510 can be formed into a flat surface.

[0066] Therefore, the upper surface of the thrust plate 510 and the lower surface of the support 613 can easily achieve point contact.

[0067] Figure 7 This is a front sectional view showing another embodiment of the bushing in an electric water pump according to an embodiment of the present invention.

[0068] As shown in the figure, the bushing 430 can be formed as a single body with a length in the vertical direction that is relatively longer than its outer diameter. The bushing 430 can be configured in the region from the upper side to the lower side of the rotor 400. This is because when the impeller 500 and the thrust plate 510 on the upper side of the rotor 400 are integrally formed by insert injection molding, the bushing 430 needs to be pressed into the through hole 410 from the lower side to the upper side of the rotor 400. Therefore, it is easier to insert and connect a longer bushing 430 than to connect a pair of shorter bushings into the through hole 410.

[0069] This utility model is not limited to the above embodiments. Of course, it has a wide range of applications, and various modifications can be made by those skilled in the art without departing from the spirit of this utility model as claimed in the claims.

Claims

1. An electric water pump, characterized in that, include: The lower housing has a rotor receiving portion protruding downwards, and the rotor receiving portion is recessed downwards from the upper surface of the rotor receiving portion to form a rotor receiving space. A shaft is disposed inside the rotor housing of the lower housing, the lower end of the shaft is fixed to the bottom of the rotor housing, and the shaft extends upward. An impeller is disposed on the upper side of the lower housing, and a thrust plate is attached to the central part of the impeller. The lower surface of the thrust plate is disposed adjacent to the upper end of the shaft. The rotor is integrally formed with the impeller. A through hole is formed in the center of the rotor to allow the shaft to be inserted into the through hole. The rotor is inserted into the rotor receiving space of the lower housing and can rotate together with the impeller. as well as The upper housing is joined to the upper side of the lower housing. The upper housing and the lower housing are joined to form an impeller receiving space inside the upper housing and the lower housing. The upper housing has an inlet for fluid to flow into the impeller receiving space and an outlet for fluid to flow out. An upper support portion is formed at the lower end of the inlet, which extends adjacent to the upper surface of the thrust plate.

2. The electric water pump according to claim 1, characterized in that, The upper support portion of the upper housing includes: Multiple supports extend from the lower inner wall of the inlet toward the thrust plate side; The support mounting portion is integrally formed with the lower end of the plurality of brackets; and A support member is attached to the support member mounting portion, the lower end of the support member protruding further downward than the support member mounting portion, and the support member is configured adjacent to the thrust plate.

3. The electric water pump according to claim 2, characterized in that, Either the upper surface of the thrust plate or the lower surface of the support member is formed as a curved surface that convexes in a direction facing each other.

4. The electric water pump according to claim 3, characterized in that, The upper surface of the thrust plate is formed as a plane, and the lower surface of the support member is formed as a convex curved surface.

5. The electric water pump according to claim 3, characterized in that, The upper surface of the thrust plate is formed as a convex curved surface, and the lower surface of the support member is formed as a plane.

6. The electric water pump according to claim 5, characterized in that, The entire surface or part of the upper surface of the thrust plate is formed as a convex curved surface.

7. The electric water pump according to claim 1, characterized in that, The upper end of the shaft is formed as an upwardly convex curved surface, and the lower surface of the thrust plate is formed as a plane.

8. The electric water pump according to claim 1, characterized in that, The thrust plate is integrally formed with the impeller in such a way that it is embedded radially outward into the impeller.

9. The electric water pump according to claim 8, characterized in that, The thickness of the central portion of the thrust plate is greater than the thickness of the portion embedded in the impeller.

10. The electric water pump according to claim 1, characterized in that, The thrust plate has a through hole that extends through the upper and lower surfaces. The through hole is positioned corresponding to the through hole of the rotor and is formed at a position spaced radially outward from the center of the thrust plate.

11. The electric water pump according to claim 10, characterized in that, When the impeller rotates, a portion of the fluid flowing in from the inlet flows downward along the space between the impeller and the lower housing and between the rotor and the lower housing on the fluid discharge side of the impeller, then flows upward along the space between the rotor and the shaft, and flows to the fluid inlet side of the impeller through the connecting hole of the thrust plate.

12. The electric water pump according to claim 1, characterized in that, The shaft includes: A fixed shaft extends in the vertical direction, and A fixing plate extends integrally with the fixing shaft in a manner perpendicular to the lower end of the fixing shaft; The fixing plate is embedded in and fixed to the bottom of the rotor housing.

13. The electric water pump according to claim 1, characterized in that, A bushing is inserted into and fixed in the through hole of the rotor. The shaft is inserted into the inside of the bushing.

14. The electric water pump according to claim 13, characterized in that, The bushing is formed as a single body whose length in the vertical direction is longer than its outer diameter. The bushing is disposed in the region from the upper side to the lower side of the rotor.

15. The electric water pump according to claim 1, characterized in that, Also includes: The motor housing is joined to the lower side of the lower housing; and The stator is disposed inside the motor housing and fits into the outside of the rotor housing of the lower housing.

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