Miniature shielding electric pump with foreign matter prevention structure

Abstract

The utility model discloses a miniature shielding electric pump with a foreign matter prevention structure, which comprises a pump cover, a pump body, a rotor, a stator and an impeller, the rotor, the stator and the impeller are positioned in the pump body, the impeller and the rotor are fixedly connected in the radial direction through a rotating shaft, and the rotor and the rotating shaft are integrated through injection molding; the pump further comprises a bearing cover integrated with the first rotor bearing in an injection molding mode, the bearing cover is installed between the pump cover and the pump body, the bearing cover is rotationally connected to the rotating shaft through the first rotor bearing, a through hole is formed in the end face, close to the first rotor bearing, of the bearing cover, and the through hole communicates with the impeller cavity and the rotor cavity. A second annular convex rib is arranged on the end face, close to the through hole, of the bearing cover, an annular convex face is arranged on the end face, away from the through hole, of the bearing cover, the second annular convex rib and the annular convex face form a first annular groove corresponding to the first annular convex rib, and the annular convex face, the second annular convex rib, the first annular convex rib and the first annular groove form a labyrinth gap. Impurities can be prevented from entering the rotor cavity while the rotor is cooled, and the rotor is prevented from being stuck.

Description

Technical Field

[0001] The utility model relates to a miniature canned motor pump with a foreign body protection structure, which can be classified into F04D29 / 58 or F04D29 / 40 by IPC classification. Background Art

[0002] In the related art, the rotor cavity and pump cover of the miniature shielded electric pump (commonly known as an electronic water pump) currently used in electric vehicles are open. Some have a through hole in the bearing cover to connect the rotor cavity and the impeller cavity. As shown in Chinese patent CN203548350U "A water pump with a rotor water-cooling heat dissipation structure", if impurities are mixed into the working medium, there is a certain risk of the impurities causing the water pump rotor to jam during operation. Therefore, how to ensure rotor heat dissipation while preventing rotor jamming has become an urgent problem to be solved.

[0003] For common knowledge and terminology, please refer to the Mechanical Engineering Handbook and Electrical Engineering Handbook published by the Machinery Industry Press (1978-1983 edition or the 2nd edition in 1997), the Pump Theory and Technology published by the Machinery Industry Press (1st edition in 2014), and the national standard GB / T7021 Terminology of Centrifugal Pumps. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention provides a miniature canned motor pump with a foreign body prevention structure, which can prevent foreign matter from entering the rotor cavity while cooling the rotor.

[0005] In the first aspect, the utility model provides a miniature shielded electric pump with an anti-foreign matter structure, comprising: a pump cover, a pump body, a rotor, a stator and an impeller, wherein the pump cover is provided with a water inlet along the direction of the pump axis, the rotor, stator and impeller are located inside the pump body, the impeller and the rotor are fixedly connected axially along the pump axis through the rotating shaft, and further comprises a bearing cover injection-molded integrally with the first rotor bearing, the first rotor bearing is located at the center of the bearing cover, the bearing cover is installed between the pump cover and the pump body, and is rotatably connected to the rotating shaft through the first rotor bearing, and forms an impeller cavity for accommodating the impeller between the pump cover and the pump body, and forms a rotating shaft for accommodating the rotor between the pump cover and the pump body. The sub-cavity; the end surface of the bearing cover near the first rotor bearing is provided with a through hole, the through hole connecting the impeller cavity and the rotor cavity, the back surface of the impeller faces away from the water inlet, the back surface of the impeller is provided with a first annular rib, the end surface of the bearing cover near the through hole is provided with a second annular rib, the end surface of the bearing cover away from the through hole is provided with an annular convex surface, the second annular rib and the annular convex surface form a first annular groove corresponding to the first annular rib, the annular convex surface, the second annular rib, the first annular rib and the first annular groove form a labyrinth gap for preventing impurities from entering the rotor cavity. According to the embodiment of the utility model, the micro canned electric pump has at least the following beneficial effects: the labyrinth gap formed by the annular convex surface, the second annular rib, the first annular groove on the bearing cover and the first annular rib on the back of the impeller cooperate to form a labyrinth path gap, so that the coolant cannot directly impact the rotor cavity when the water pump is working, and the labyrinth gap can effectively prevent impurities in the coolant from entering the rotor cavity, while the coolant can enter the rotor cavity through the through hole on the bearing cover for heat dissipation, thereby preventing the rotor from getting stuck and enhancing the stability of the rotor operation.

[0006] According to some embodiments of the present invention, an annular stopper cover is provided between the pump cover and the bearing cover, and the outer edge of the bearing cover is provided with a plurality of lugs, and the annular stopper cover presses the lugs. The stopper cover presses the lugs of the bearing cover to limit the axial movement of the rotor.

[0007] According to some embodiments of the present invention, a positioning post is provided on the pump body, a positioning hole is provided on the annular limiting cover, and the annular limiting cover is ultrasonically welded to the positioning post through the positioning hole so that the annular limiting cover can be installed on the pump body, making it easier to position the limiting cover during installation.

[0008] According to some embodiments of the present invention, the edge of the back of the impeller is provided with a back blade. The back blade, the inner circumference of the annular limit cover, and the annular convex surface cooperate to form a buffer channel for buffering the coolant. The buffer channel can effectively prevent the working medium from impacting the rotor cavity, thereby reducing the impact force of impurities.

[0009] According to some embodiments of the present invention, a third annular rib extends from the inner circumference of the annular limit cover along the pump shaft direction, and the third annular rib, the back blade, the inner circumference of the annular limit cover, the annular convex surface and the outer circumference of the impeller form the buffer water channel.

[0010] According to some embodiments of the present invention, an annular ceramic gasket is installed between the first rotor bearing and the rotor, and the end faces of the annular ceramic gasket abut against the end faces of the first rotor bearing and the rotor, respectively. The ceramic gasket can prevent the first rotor bearing from wearing the rotor.

[0011] According to some embodiments of the present invention, a second annular groove is provided on the end face of the pump body close to the outer edge, and a first sealing ring is installed in the second annular groove. When the pump cover is connected to the pump body, the first sealing ring is located on the outer edge end face of the pump cover and abuts against the first sealing ring to enhance the sealing of the connection between the pump cover and the pump body.

[0012] According to some embodiments of the present invention, a bearing mounting portion is further provided at the bottom of the rotor cavity, and a second rotor bearing is installed on the bearing mounting portion. Part of the rotating shaft is passed through the second rotor bearing, and a gap is left between the second rotor bearing and the two opposite end faces of the rotor to increase the cooling area of the rotor and enhance the cooling efficiency.

[0013] According to some embodiments of the present invention, the inner circumference of the bearing mounting portion is provided with a first step, the outer circumference of the second rotor bearing is provided with a second step that mates with the first step, and a second sealing ring is embedded between the first and second steps. The second sealing ring serves to align the centering, preventing the rotor from seizing due to misalignment between the two ends of the second rotor bearing.

[0014] According to some embodiments of the present invention, a gap is left between the outer circumference of the rotor and the inner circumference of the pump body for the coolant to flow through. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0016] Figure 1 This is an overall schematic diagram of a miniature canned motor pump provided by one embodiment of the present utility model;

[0017] Figure 2 yes Figure 1 A top view of a miniature canned motor pump is shown;

[0018] Figure 3 yes Figure 2 AA cross-sectional view of the micro canned motor pump shown;

[0019] Figure 4 yes Figure 3 A partial enlarged view of a miniature canned motor pump is shown;

[0020] Figure 5 This is a partial schematic diagram of a miniature canned motor pump provided by one embodiment of the present utility model;

[0021] Figure 6 This is another partial schematic diagram of a miniature canned motor pump provided by one embodiment of the present utility model;

[0022] Figure 7 yes Figure 6 BB cross-sectional view of the micro canned motor pump shown;

[0023] Figure 8 This is a top view of a bearing cover provided by one embodiment of the present utility model;

[0024] Figure 9 yes Figure 8 The CC section of the bearing cap is shown;

[0025] Figure 10 This is a top view of an impeller provided by one embodiment of the utility model;

[0026] Figure 11 yes Figure 10 DD section of the impeller shown;

[0027] Figure 12 yes Figure 11 A bottom view of the impeller is shown.

[0028] Figure Number:

[0029] Pump cover 100; water inlet 101;

[0030] Pump body 200; positioning column 210; second annular groove 220; first sealing ring 230; bearing mounting portion 240; first stepped portion 241; second rotor bearing 250; second stepped portion 251; second sealing ring 252;

[0031] Rotor 300; rotor cavity 301; bearing cover 310; first rotor bearing 320; through hole 330; annular convex surface 340; second annular rib 350; first annular groove 360; lug 370; annular ceramic gasket 380;

[0032] Impeller 400; impeller cavity 401; first annular rib 410; buffer water channel 420; back blade 430;

[0033] Rotating shaft 500;

[0034] Maze gap 600;

[0035] Annular limiting cover 700; positioning hole 710; third annular rib 720. DETAILED DESCRIPTION

[0036] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of this utility model, "a plurality" means more than two. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0039] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0040] Reference Figures 1 to 4 as well as Figure 7The micro shielded electric pump includes: a pump cover 100, a pump body 200, a rotor 300, a stator and an impeller 400. The pump cover 100 is provided with a water inlet 101 along the pump axis direction. The rotor 300, the stator and the impeller 400 are installed inside the pump body 200. The impeller 400 and the rotor 300 are fixedly connected along the pump axis direction through the rotating shaft 500. The stator and the pump body 200 are injection molded as one. The rotor 300 and the rotating shaft 500 are injection molded as one. A bearing cover 310 is provided between the pump cover 100 and the pump body 200. The bearing cover 310 and the first rotor bearing 320 are injection molded as one. The first rotor bearing 320 is injection molded at the center of the bearing cover 310. The bearing cover 310 is rotatably mounted on the bearing through the first rotor bearing 320. An impeller cavity 401 for accommodating the impeller 400 is formed between the bearing cover 310 and the pump cover 100, and a rotor cavity 301 for accommodating the rotor 300 is formed between the bearing cover 310 and the pump body 200. A through hole 330 is provided on the end face of the bearing cover 310 near the first rotor bearing 320. The through hole 330 connects the impeller cavity 401 and the rotor cavity 301, and the through holes 330 are evenly distributed along the circumference of the first rotor bearing 320. The back of the impeller 400 faces away from the water inlet 101 of the pump cover 100, and a first annular rib is provided on the back of the impeller 400. 410, a second annular rib 350 is provided on the end surface of the bearing cover 310 close to the through hole 330, and an annular convex surface 340 is provided on the end surface of the bearing cover 310 away from the through hole 330. The second annular rib 350 and the annular convex surface 340 form a first annular groove 360 corresponding to the first annular rib 410. The annular convex surface 340, the second annular rib 350, the first annular rib 410 and the first annular groove 360 form a labyrinth gap 600, which is used to prevent impurities from entering the rotor cavity 301.

[0041] Specifically, when the micro-shielded electric pump is in operation, the coolant enters the rotor cavity 301 from the water inlet 101. As the impeller 400 rotates, part of the coolant enters the labyrinth gap 600. The path of the labyrinth gap 600 is "concave-convex", which can prevent impurities in the coolant from entering the rotor cavity 301, thereby preventing the rotor 300 from getting stuck.

[0042] It is understandable that the number of the through holes 330 can be set to multiple and can be set according to actual needs to improve the heat dissipation efficiency of the rotor 300. The number of the through holes 330 is preferably 6.

[0043] refer to Figures 5 to 9An annular stopper cover 700 is provided between the pump cover 100 and the bearing cover 310. A plurality of lugs 370 are provided on the outer edge of the bearing cover 310. The annular stopper cover 700 presses against the lugs 370 to limit axial movement of the rotor 300. A positioning post 210 is provided on the pump body 200. A positioning hole 710 is provided on the annular stopper cover 700. The annular stopper cover 700 is positioned by the positioning hole 710 and the positioning post 210. The annular stopper cover 700 is then ultrasonically welded to the pump body 200. Specifically, a flange extends from the inner bottom of the annular stopper cover 700. After ultrasonic welding, the flange presses against the lugs 370 of the bearing cover 310, thereby pressing the bearing cover 310 and securing the bearing cover 310.

[0044] It is understood that when the rotor 300 moves axially, the rotor 300, the rotating shaft 500, and the impeller 400 move axially together. However, because the stopper cap 700 presses against the bearing cap 310, the bearing cap 310 is fixed. When the rotor 300 moves axially, the rotor 300 is supported by the bearing cap 310, thereby limiting the space for axial movement of the rotor 300. In addition, because the space for axial movement of the rotor 300 is limited, the cross-sectional size of the path of the labyrinth gap 600 between the bearing cap 310 and the impeller 400 is also limited, so that the cross-sectional size of the labyrinth gap 600 path is not too large, thereby preventing the ingress of impurities.

[0045] refer to Figures 10 to 12 The edge of the back of the impeller 400 is provided with a back blade 430, and the inner circumference of the annular limit cover 700 and the annular convex surface 340 cooperate to form a buffer water channel for buffering the coolant, which can effectively prevent the coolant or cooling medium from impacting the rotor cavity 301, and on the other hand, it also reduces the impact force of impurities in the cooling medium. Specifically, the inner circumference of the annular limit cover 700 extends a third annular rib 720 along the direction of the pump axis. The third annular rib 720, the back blade 430, the inner circumference of the annular limit cover 700, the annular convex surface 340 and the outer circumference of the impeller 400 form a buffer water channel 420. When the coolant enters the buffer water channel 420, the back blade 430 and the annular convex surface 340 in the buffer water channel 420 cooperate to hinder the flow of the coolant, thereby preventing the coolant from being flushed into the rotor cavity 301 due to excessive impact.

[0046] refer to Figure 3 、 Figure 4 and Figure 7An annular ceramic gasket 380 is installed between the first rotor bearing 320 and the rotor 300. The end faces of the annular ceramic gasket 380 abut against the end faces of the first rotor bearing 320 and the rotor 300, respectively. Specifically, the end face of the rotor 300 is provided with a mounting groove corresponding to the annular ceramic gasket 380, and the annular ceramic gasket 380 is installed in this mounting groove. When the water pump is operating, the rotor 300 rotates at high speed. The ceramic gasket 380 can effectively prevent the first rotor bearing 320 from wearing the rotor 300, thereby improving the operating efficiency of the rotor 300 and extending the service life of the water pump.

[0047] refer to Figure 3 A second annular groove 220 is provided on the end face of the pump body 200 close to the outer edge, and a first sealing ring 230 is installed in the second annular groove 220. When the pump cover 100 is connected to the pump body 200, the outer edge end face of the pump cover 100 abuts against the first sealing ring 230, thereby enhancing the sealing of the connection between the pump cover 100 and the pump body 200.

[0048] Still refer to Figure 3 A bearing mounting portion 240 is also provided at the bottom of the rotor cavity 301. The bearing mounting portion 240 is mounted with a second rotor bearing 250. The rotating shaft 500 is passed through the second rotor bearing 250. A gap is left between the two opposite end faces of the second rotor bearing 250 and the rotor 300, thereby increasing the cooling area of the rotor 300 and providing high cooling efficiency. Specifically, after the coolant enters the rotor cavity 301 from the through hole 330, it flows to the bottom of the rotor 300. The rotor 300 enters the gap between the second rotor bearing 250 and the rotor 300 to fully dissipate the heat from the bottom of the rotor 300. In addition, the gap between the second rotor bearing 250 and the rotor 300 also limits the axial movement space of the rotor 300, making the structure of the entire water pump more compact.

[0049] Specifically, the inner circumference of the bearing mounting portion 240 is provided with a first stepped portion 241, and the outer circumference of the second rotor bearing 250 is provided with a second stepped portion 251 that mates with the first stepped portion 241. A second sealing ring 252 is embedded between the first stepped portion 241 and the second stepped portion 251. The second sealing ring 252 serves to align the rotor 300, preventing the two ends of the second rotor bearing 250 from becoming misaligned during operation and causing the rotor 300 to become stuck.

[0050] A gap is left between the outer circumference of the rotor 300 and the inner circumference of the pump body 200 for the coolant to flow through. This dissipates heat from the outer circumference of the rotor 300 and increases the coolant's retention time for more effective heat dissipation. Specifically, after the coolant flows from the through-holes 330 into the rotor cavity 301, the gap between the outer circumference of the rotor 300 and the inner circumference of the pump body 200, as well as between the second rotor bearing 250 and the two end faces of the rotor 300, allows the coolant to cover the entire rotor, effectively dissipating heat from the rotor 300.

[0051] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A miniature canned motor pump with a foreign body protection structure, comprising: A pump cover (100), a pump body (200), a rotor (300), a stator and an impeller (400), wherein the pump cover (100) is provided with a water inlet (101) along the pump axis direction, the rotor (300), the stator and the impeller (400) are located inside the pump body (200), the impeller (400) and the rotor (300) are axially fixedly connected along the pump axis through a rotating shaft (500), and the pump cover (100) further comprises a bearing cover (310) which is injection-molded integrally with the first rotor bearing (320). ), the first rotor bearing (320) is located at the center of the bearing cover (310), the bearing cover (310) is installed between the pump cover (100) and the pump body (200), and is rotatably connected to the rotating shaft (500) through the first rotor bearing (320), and forms an impeller cavity (401) for accommodating the impeller (400) between the bearing cover (310) and the pump body (200), and forms a rotor cavity (301) for accommodating the rotor (300) between the bearing cover (310); 0) is provided with a through hole (330) on the end surface close to the first rotor bearing (320), the through hole (330) is connected to the impeller cavity (401) and the rotor cavity (301), the back of the impeller (400) is facing away from the water inlet (101), the back of the impeller (400) is provided with a first annular rib (410), the end surface of the bearing cover (310) close to the through hole (330) is provided with a second annular rib (350), the bearing cover (310) is away from the An annular convex surface (340) is provided on the end surface of the through hole (330); the second annular convex rib (350) and the annular convex surface (340) form a first annular groove (360) corresponding to the first annular convex rib (410); the annular convex surface (340), the second annular convex rib (350), the first annular convex rib (410) and the first annular groove (360) form a labyrinth gap (600) for preventing impurities from entering the rotor cavity (301).

2. The miniature canned motor pump according to claim 1, characterized in that: An annular limiting cover (700) is provided between the pump cover (100) and the bearing cover (310), and a plurality of lugs (370) are provided on the outer edge of the bearing cover (310), and the annular limiting cover (700) presses the plurality of lugs (370).

3. The miniature canned motor pump according to claim 2, characterized in that: The pump body (200) is provided with a positioning column (210), and the annular limiting cover (700) is provided with a positioning hole (710). The annular limiting cover (700) is ultrasonically welded to the positioning column (210) through the positioning hole (710) so that the annular limiting cover (700) is installed on the pump body (200).

4. The miniature canned motor pump according to claim 2, characterized in that: The edge of the back side of the impeller (400) is provided with a back blade (430), and the back blade (430), the inner peripheral surface of the annular limiting cover (700) and the annular convex surface (340) cooperate to form a buffer water channel (420) for buffering the cooling liquid.

5. The miniature canned motor pump according to claim 4, characterized in that: A third annular convex rib (720) extends from the inner circumference of the annular limiting cover (700) along the pump shaft direction, and the third annular convex rib (720), the back blade (430), the inner circumference of the annular limiting cover (700), the annular convex surface (340) and the outer circumference of the impeller (400) form the buffer water channel (420).

6. The miniature canned motor pump according to claim 1, characterized in that: An annular ceramic gasket (380) is installed between the first rotor bearing (320) and the rotor (300), and the end faces of the annular ceramic gasket (380) are respectively in contact with the end faces of the first rotor bearing (320) and the rotor (300).

7. The miniature canned motor pump according to claim 1, characterized in that: A second annular groove (220) is provided on the end face of the pump body (200) close to the outer edge, and a first sealing ring (230) is installed in the second annular groove (220). When the pump cover (100) is connected to the pump body (200), the first sealing ring (230) is located on the outer edge end face of the pump cover (100) and abuts against the first sealing ring (230).

8. The miniature canned motor pump according to claim 1, characterized in that: A bearing mounting portion (240) is further provided at the bottom of the rotor cavity (301), a second rotor bearing (250) is mounted on the bearing mounting portion (240), a portion of the rotating shaft (500) is passed through the second rotor bearing (250), and a gap is left between the second rotor bearing (250) and two end surfaces opposite to the rotor (300).

9. The miniature canned motor pump according to claim 8, characterized in that: The inner circumferential surface of the bearing mounting portion (240) is provided with a first stepped portion (241), the outer circumferential surface of the second rotor bearing (250) is provided with a second stepped portion (251) that matches the first stepped portion (241), and a second sealing ring (252) is embedded between the first stepped portion (241) and the second stepped portion (251).

10. The miniature canned motor pump according to claim 1 or 8, characterized in that: A gap is left between the outer circumference of the rotor (300) and the inner circumference of the pump body (200) for the coolant to flow through.

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