Miniature shielded electric pump with metal spacer sleeve

Abstract

The utility model discloses a miniature shielding electric pump with metal isolation sleeve, include: pump cover, pump body, pivot, with the stator subassembly of pump body integral injection, and the rotor subassembly of integral injection with pivot and the tubular isolation sleeve, the tubular isolation sleeve center is equipped with the inner chamber of one end opening, the stator subassembly center forms one pump inner chamber, and the pump inner chamber contains the tubular isolation sleeve, and the inner chamber bottom of tubular isolation sleeve is embedded with annular base, and the center of annular base is equipped with the first bearing of outside wall sleeve and is equipped with sealing ring, and the pivot is inserted in the first bearing to install rotor subassembly in the inner chamber of tubular isolation sleeve, can reduce manufacturing cost under the condition of guaranteeing higher concentricity.

Description

Technical Field

[0001] This utility model relates to a miniature shielded electric pump with an isolation sleeve, which may be classified under IPC category F04D 13 / 06 or F04D29 / 02. Background Technology

[0002] Currently, the motor unit in automotive electronic water pumps typically consists of a rotor assembly 400, a stator assembly 300, and other supporting parts. The current motor unit generally involves molding the rotor assembly 400 and bearings together, and also molding an impeller structure. The steel shaft is then molded integrally with the pump body 200 or an isolation sleeve, providing support for the rotor assembly 400. This manufacturing process requires a high degree of concentricity in the injection-molded parts to ensure good concentricity consistency in the overall product assembly. Furthermore, to guarantee the high concentricity of the injection-molded inserts, high-precision molds and more stringent injection molding production conditions are needed, resulting in high costs. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a miniature shielded electric pump with an isolation sleeve, which can ensure a high degree of concentricity.

[0004] In a first aspect, this utility model provides a miniature shielded electric pump with a metal isolation sleeve, comprising: a pump cover, a pump body, a rotating shaft, a stator assembly integrally injection molded with the pump body, a rotor assembly integrally injection molded with the rotating shaft, and a cylindrical isolation sleeve. The cylindrical isolation sleeve has an inner cavity with one open end at its center. The stator assembly has a pump inner cavity at its center. The pump inner cavity accommodates the cylindrical isolation sleeve. An annular base is embedded at the bottom of the inner cavity of the cylindrical isolation sleeve. A first bearing with a sealing ring on its outer wall is installed at the center of the annular base. The rotating shaft is inserted into the first bearing to install the rotor assembly into the inner cavity of the cylindrical isolation sleeve.

[0005] The miniature shielded electric pump according to the present invention has at least the following beneficial effects: by setting an annular base for fixing a bearing with a sealing ring inside a cylindrical isolation sleeve, and the rotor assembly integrally injection molded with the rotor assembly passes through the bearing, the rotor assembly is installed in the inner cavity of the cylindrical isolation sleeve. Since the sealing ring is elastic, it can reduce the vibration caused by the rotation when the rotor assembly rotates, thereby eliminating the bearing eccentricity. It is not necessary to use high-precision injection molding to integrally mold the shaft with the pump body or isolation sleeve, which reduces the manufacturing cost while ensuring high concentricity.

[0006] According to some embodiments of the present invention, an annular cover with a second bearing integrally injection molded in the center is provided on one end face of the opening of the cylindrical isolation sleeve. The rotating shaft passes through the second bearing to support the rotating shaft, and the annular cover fixes the second bearing to prevent the second bearing from rotating.

[0007] According to some embodiments of this utility model, the annular inner cover has an annular limiting protrusion formed along the direction towards the first bearing, and the annular outer circumferential surface of the limiting protrusion cooperates with the inner circumferential wall of the cylindrical isolation sleeve for limiting. By aligning with the rotor assembly, it prevents the rotor assembly from dislodging due to axial force.

[0008] According to some embodiments of this utility model, the annular middle cover includes a stepped outer annular end face and an inner annular end face, and the outer annular end face and the inner annular end face are provided with flow channels for coolant to pass through. These flow channels can dissipate heat from the rotor assembly, stator assembly, and cylindrical isolation sleeve.

[0009] According to some embodiments of this utility model, an impeller cavity is formed between the annular middle cover and the pump cover. The flow channel includes: a first flow channel axially penetrating the outer annular end face and a second flow channel penetrating the inner annular end face; the first flow channel connects the impeller cavity and the end face of the cylindrical isolation sleeve, and the second flow channel connects the impeller cavity and the inner cavity of the cylindrical isolation sleeve. Direct heat dissipation is provided for the isolation sleeve and rotor assembly, and indirect heat dissipation is provided for the stator assembly.

[0010] According to some embodiments of this utility model, a notch is formed between two adjacent limiting protrusions, the notch connecting to the inner cavity of the cylindrical isolation sleeve. The bottom of the annular inner cover is provided with a first water storage tank and a second water storage tank for buffering coolant. The wall of the first water storage tank has a slot opening facing the rotating shaft, the slot opening communicating with the second water storage tank. The second water storage tank communicates with the inner cavity of the cylindrical isolation sleeve through the notch. The first and second water storage tanks can buffer the incoming coolant, preventing damage caused by the coolant impacting the rotor assembly.

[0011] According to some embodiments of this utility model, the annular base has several arc-shaped baffles distributed circumferentially on the inner side of the annular wall for mounting the first bearing. The inner wall of the arc-shaped baffles is provided with an arc-shaped boss for mounting the first bearing. During installation, the arc-shaped boss can limit the first bearing and prevent it from coming out from the bottom.

[0012] According to some embodiments of this utility model, an annular protrusion is formed on the end face of the rotor assembly facing the pump cover, and an annular boss is formed on the inner sidewall of the annular protrusion, with a ceramic gasket disposed on the annular boss. This improves the wear resistance of the second bearing.

[0013] According to some embodiments of this utility model, the outer periphery of the ceramic gasket is provided with a radially protruding first protrusion, and the inner wall of the annular protrusion is formed with a first groove corresponding to the first protrusion, the first protrusion being embedded in the first groove. This prevents the ceramic gasket from rotating.

[0014] According to some embodiments of the present invention, the outer peripheral wall of the second bearing is provided with a radially recessed second groove. When the annular middle cover is integrally injection molded with the second bearing, the inner peripheral wall of the annular middle cover forms a second protrusion corresponding to the second groove to fix the second bearing and prevent the second bearing from rotating. Attached Figure Description

[0015] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.

[0016] Figure 1 This is an overall schematic diagram of a miniature shielded pump provided in one embodiment of the present invention;

[0017] Figure 2 yes Figure 1 A side view of the miniature shielded pump is shown.

[0018] Figure 3 yes Figure 2 A cross-sectional view of the miniature shielded pump is shown in AA format.

[0019] Figure 4 yes Figure 2 A schematic diagram of the overall shape of the annular base is shown.

[0020] Figure 5 yes Figure 2 A schematic diagram of the first bearing with a sealing ring is shown.

[0021] Figure 6 yes Figure 2 A schematic diagram of the overall ring-shaped inner cover is shown;

[0022] Figure 7 yes Figure 6 The side view of the annular inner cover is shown;

[0023] Figure 8 yes Figure 2 The diagram shows the overall configuration of the second bearing.

[0024] Figure 9 yes Figure 2 A schematic diagram of the overall rotor assembly is shown;

[0025] Figure 10 yes Figure 2 A schematic diagram of the overall ceramic gasket is shown;

[0026] Figure 11 yes Figure 7 The BB section view of the annular inner cover is shown;

[0027] Figure 12 yes Figure 7 The image shows a bottom view of the annular inner cover.

[0028] Icon labels:

[0029] Pump cover 100; impeller cavity 110; pump body 200; stator assembly 300; pump inner cavity 310; rotor assembly 400; rotating shaft 410; annular protrusion 420; annular boss 421; first groove 422; ceramic gasket 430; first protrusion 431; cylindrical isolation sleeve 500; annular base 510; first bearing 520; flange 521; sealing ring 530; arc-shaped baffle 540; arc-shaped boss 541; annular middle cover 600; outer annular end face 610; inner annular end face 620; flow passage 630; first flow passage 631; second flow passage 632; second protrusion 640; second bearing 650; second groove 660; limiting protrusion 670; notch 671; first water storage tank 680; slot 681; second water storage tank 690. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0033] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0034] Reference Figures 1 to 5A miniature shielded electric pump includes: a pump cover 100, a pump body 200, a rotating shaft 410, a stator assembly 300 integrally injection molded with the pump body 200, a rotor assembly 400 integrally injection molded with the rotating shaft 410, and a cylindrical isolation sleeve 500. The cylindrical isolation sleeve has an open inner cavity at its center. The stator assembly 300 has a pump inner cavity 310 at its center, which houses the cylindrical isolation sleeve 500. An annular base 510 is embedded at the bottom of the inner cavity of the cylindrical isolation sleeve 500. A first bearing 520 with a sealing ring 530 on its outer wall is installed at the center of the annular base 510. The rotating shaft 410 is inserted into the first bearing 520 to install the rotor assembly 400 into the inner cavity of the cylindrical isolation sleeve 500. Specifically, before assembling the rotor assembly 400, the sealing ring 530 is first fitted onto the first bearing 520, and then the first bearing 520 is installed into the annular base 510. Next, the annular base 510 with the first bearing 520 installed is embedded into the bottom of the inner cavity of the cylindrical isolation sleeve 500, and the cylindrical isolation sleeve 500 is then placed into the pump inner cavity 310. Finally, the pump shaft of the rotor assembly 400 is inserted into the first bearing 520 to install the rotor assembly 400 into the inner cavity of the cylindrical isolation sleeve 500. Because the first bearing 520 is fitted with the sealing ring 530, which has a certain degree of elasticity, the rotor assembly 400 can reduce the vibration caused by rotation when rotating, thereby eliminating the bearing eccentricity. High-precision injection molding is not required to integrally mold the shaft 410 with the pump body 200 or the isolation sleeve, thus reducing manufacturing costs while ensuring high concentricity.

[0035] refer to Figure 3 , Figure 6 , Figure 7 and Figure 11The cylindrical isolation sleeve 500 has an annular middle cover 600 with a second bearing 650 integrally injection molded in the center at one end face of the opening. The rotating shaft 410 passes through the second bearing 650. The annular middle cover 600 includes an outer annular end face 610 and an inner annular end face 620 in a stepped shape. Both the outer annular end face 610 and the inner annular end face 620 are provided with flow channels 630 for coolant to pass through. An impeller cavity 110 is formed between the annular middle cover 600 and the pump cover 100. The flow channel 630 connects the inner cavity of the cylindrical isolation sleeve 500 and the impeller cavity 110. The flow channel 630 includes a first flow channel 631 axially penetrating the outer annular end face 610 and a second flow channel 632 penetrating the inner annular end face 620. The first flow channel 631 connects the impeller cavity 110 and the end face of the cylindrical isolation sleeve 500, and the second flow channel 632 connects the impeller cavity 110 and the inner cavity of the cylindrical isolation sleeve 500. Specifically, a notch 671 is formed between two adjacent limiting protrusions 670, and the notch 671 connects to the inner cavity of the cylindrical isolation sleeve 500. The bottom of the annular middle cover 600 is provided with a first water storage tank 680 and a second water storage tank 690 for buffering coolant. The wall of the first water storage tank 680 has a slot 681 opening towards the direction of the rotating shaft 410, and the slot 681 communicates with the second water storage tank 690. The second water storage tank 690 communicates with the inner cavity of the cylindrical isolation sleeve 500 through the notch 671. When the canned motor pump is working, the stator assembly 300 generates heat, which is transferred to the metal cylindrical isolation sleeve 500. The coolant in the impeller cavity 110 can enter the first water storage tank 680 through the first flow passage 631 of the outer annular end face 610, and then flow from the slot 681 to the second water storage tank 690. The two water storage tanks buffer the incoming coolant to prevent it from impacting the rotor assembly 400. The second water storage tank 690 flows into the inner cavity of the cylindrical isolation sleeve through the notch 671, thereby carrying away the heat from the cylindrical isolation sleeve 500 and the rotor assembly 400. Then, it flows out from the second flow passage 632 of the inner annular end face 620 to the impeller cavity 110, thus directly dissipating heat from the cylindrical isolation sleeve 500 and the rotor assembly 400, and also indirectly dissipating heat from the stator assembly 300, improving the heat dissipation efficiency of the stator assembly 300.

[0036] Understandably, the number of flow channels 630 can be set according to actual needs. In this utility model, the number of flow channels 630 is preferably 12, with 6 inner annular end faces 620 and 6 outer annular end faces 610, that is, there are 6 first flow channels 631 and 6 second flow channels 632.

[0037] refer to Figure 3 and Figure 7The annular cover 600 has an annular limiting protrusion 670 formed along the direction towards the first bearing 520. The annular outer circumferential surface of the limiting protrusion 670 cooperates with the inner circumferential wall of the cylindrical isolation sleeve 500 for limiting, and the pump cover 100 presses against part of the outer annular end face 610. Specifically, when the rotor assembly 400 rotates, it generates an upward axial force. By pressing against part of the outer annular end face 610 by the pump cover 100, the limiting protrusion 670 of the annular cover 600 can abut against the end face of the rotor assembly 400, thereby preventing damage caused by the rotor assembly 400 dislodging.

[0038] refer to Figures 3 to 5 The annular base 510 has several arc-shaped baffles 540 distributed circumferentially on the inner side of the annular wall for mounting the first bearing 520. The inner sidewall of the arc-shaped baffles 540 is provided with an arc-shaped boss 541 for mounting the first bearing 520. Specifically, when the first bearing 520 is installed, the sealing ring 530, which is fitted over the first bearing 520, abuts against the end face of the arc-shaped boss 541 and the inner sidewall of the arc-shaped baffles 540, thereby fixing the first bearing 520 and limiting its movement to prevent it from easily coming out from the bottom. One end of the sidewall of the first bearing 520 has a radially formed flange 521, which cooperates with the arc-shaped boss 541 to limit the sealing ring 530 and also hold the first bearing 520 in place, preventing it from coming out from the bottom.

[0039] It is understood that the number of arc-shaped baffles 540 can be set according to actual needs. In this utility model, the number of arc-shaped baffles 540 is preferably 6.

[0040] refer to Figure 9 and Figure 10 An annular protrusion 420 is formed on the end face of the rotor assembly 400 facing the pump cover 100. An annular boss 421 is formed on the inner wall of the annular protrusion 420, and a ceramic gasket 430 is disposed on the annular boss 421. When the rotor assembly 400 rotates, it can prevent the second bearing 650 from directly rubbing against the rotor assembly 400, thereby improving the wear resistance of the second bearing 650 and extending its service life. Specifically, the outer periphery of the ceramic gasket 430 is provided with a radially protruding first protrusion 431, and the inner wall of the annular protrusion 420 is formed with a first groove 422 corresponding to the first protrusion 431. The first protrusion 431 is embedded in the first groove 422. Since the first protrusion 431 and the first groove 422 form a locking mechanism, the ceramic gasket 430 can rotate with the rotor assembly 400 without causing rotational friction between the rotor assembly 400 and the ceramic gasket 430, further extending the service life of the ceramic gasket 430 and the rotor assembly 400.

[0041] It is understood that the number of first grooves 422 can be set according to the number of first protrusions 431. In this utility model, the number of first protrusions 431 and first grooves 422 is preferably 3.

[0042] refer to Figure 6 and Figure 8 The outer peripheral wall of the second bearing 650 is provided with a radially recessed second groove 660. When the annular cover 600 and the second bearing 650 are integrally injection molded, the inner peripheral wall of the annular cover 600 forms a second protrusion 640 corresponding to the second groove 660 to fix the second bearing 650. Specifically, when the shaft 410 rotates and rotates within the second bearing 650, the second protrusion 640 is embedded in the second groove 660, thereby fixing the second bearing 650 and preventing the second bearing 650 from rotating due to the rotation of the shaft 410, thus preventing the second bearing 650 from wearing the bearing cover.

[0043] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A miniature shielded electric pump with a metal isolation sleeve, comprising: The pump cover (100), pump body (200), rotating shaft (410), stator assembly (300) integrally injection molded with the pump body (200), rotor assembly (400) integrally injection molded with the rotating shaft (410), and cylindrical isolation sleeve (500) are provided with an inner cavity with one end open at the center of the cylindrical isolation sleeve (500). A pump inner cavity (310) is formed at the center of the stator assembly (300). The pump inner cavity (310) accommodates the cylindrical isolation sleeve (500). The cylindrical isolation sleeve (500) is characterized in that an annular base (510) is embedded at the bottom of the inner cavity of the cylindrical isolation sleeve (500). A first bearing (520) with a sealing ring (530) is installed at the center of the annular base (510). The rotating shaft (410) is inserted into the first bearing (520) to install the rotor assembly (400) in the inner cavity of the cylindrical isolation sleeve (500).

2. The miniature shielded electric pump according to claim 1, characterized in that, The cylindrical isolation sleeve (500) has an annular cover (600) with a second bearing (650) integrally injection molded in the center on one end face of the opening, and the rotating shaft (410) passes through the second bearing (650).

3. The miniature shielded electric pump according to claim 2, characterized in that, The annular cover (600) has several annular limiting protrusions (670) formed in the direction of the first bearing (520), and the annular outer peripheral surface of the limiting protrusions (670) cooperates with the inner peripheral wall of the inner cavity of the cylindrical isolation sleeve (500) for limiting.

4. The miniature shielded electric pump according to claim 3, characterized in that, The annular cover (600) includes a stepped outer annular end face (610) and an inner annular end face (620), and the outer annular end face (610) and the inner annular end face (620) are provided with flow channels (630) for coolant to pass through.

5. The miniature shielded electric pump according to claim 4, characterized in that, An impeller cavity (110) is formed between the annular middle cover (600) and the pump cover (100). The flow passage (630) includes: a first flow passage (631) axially penetrating the outer annular end face (610) and a second flow passage (632) penetrating the inner annular end face (620); the first flow passage (631) connects the impeller cavity (110) and the end face of the cylindrical isolation sleeve (500), and the second flow passage (632) connects the impeller cavity (110) and the inner cavity of the cylindrical isolation sleeve (500).

6. The miniature shielded electric pump according to claim 5, characterized in that, A notch (671) is formed between two adjacent limiting protrusions (670), and the notch (671) connects to the inner cavity of the cylindrical isolation sleeve (500). The bottom of the annular middle cover (600) is provided with a first water storage tank (680) and a second water storage tank (690) for buffering coolant. The wall of the first water storage tank (680) is provided with a slot (681) facing the direction of the rotating shaft (410). The slot (681) connects to the second water storage tank (690). The second water storage tank (690) connects to the inner cavity of the cylindrical isolation sleeve (500) through the notch (671).

7. The miniature shielded electric pump according to claim 1, characterized in that, The annular base (510) has several arc-shaped baffles (540) distributed circumferentially on the inner side of the annular wall for installing the first bearing (520). The inner wall of the arc-shaped baffle (540) is provided with an arc-shaped boss (541) for sleeved on the first bearing (520).

8. The miniature shielded electric pump according to claim 1, characterized in that, The rotor assembly (400) has an annular protrusion (420) on its end face toward the pump cover (100), and an annular boss (421) is formed on the inner wall of the annular protrusion (420), and a ceramic gasket (430) is provided on the annular boss (421).

9. The miniature shielded electric pump according to claim 8, characterized in that, The outer periphery of the ceramic gasket (430) is provided with a first protrusion (431) that is radially protruding, and the inner wall of the annular protrusion (420) is formed with a first groove (422) corresponding to the first protrusion (431), and the first protrusion (431) is embedded in the first groove (422).

10. The miniature shielded electric pump according to claim 2, characterized in that, The outer peripheral wall of the second bearing (650) is provided with a second groove (660) formed by radial recess. When the annular middle cover (600) and the second bearing (650) are integrally injection molded, the inner peripheral wall of the annular middle cover (600) forms a second protrusion (640) corresponding to the second groove (660) to fix the second bearing (650).

Images