A pump

Abstract

The application discloses a pump, comprising a driving assembly, a shell assembly and a rotating assembly, the shell assembly comprises a first shell and a water distribution disc, the first shell and the water distribution disc are sealingly fixed, a containing cavity is formed in the pump, the rotating assembly comprises an impeller, a rotor and a rotating shaft, the pump further comprises a bearing support, the bearing support is fixed or position-limited with the water distribution disc and / or the first shell, so that the containing cavity is divided into a first sub-cavity and a second sub-cavity, part of the impeller is located in the second sub-cavity, the rotor is located in the first sub-cavity, the bearing support further has a plurality of through holes, the equivalent diameter of the through holes is 4-6 mm, and the through holes are communicated with the first sub-cavity and the second sub-cavity. By arranging the bearing support, the bearing support has a plurality of through holes, the equivalent diameter of the through holes is 4-6 mm, the through holes are communicated with the first sub-cavity and the second sub-cavity, part of the fluid in the first sub-cavity can enter the second sub-cavity through the through holes, and the fluid entering the second sub-cavity can flush away the silt.

Description

[Technical Field]

[0001] This invention relates to the field of fluid control, and in particular to a pump. [Background Technology]

[0002] A pump includes a drive assembly, a housing assembly, and a rotating assembly. The housing assembly includes a first housing and a water distribution plate. The drive assembly includes a stator coil. The rotating assembly includes an impeller, a rotor, and a shaft. The shaft passes through the rotor and is fixed to the rotor. The rotor is located in the receiving cavity of the water distribution plate. For the stability of the shaft, a bearing bracket and a bearing are also provided. The bearing bracket cover is fixed to the water distribution plate. The shaft passes through the bearing, and there is a clearance fit between the bearing and the shaft.

[0003] During pump operation, when the impeller rotates, a vacuum is created in the hole near the bearing support, allowing some mud and sand to enter the gap between the bearing support and the shaft. As the shaft rotates, the mud and sand particles rotate as well, causing bearing wear and thus reducing the pump's service life. [Summary of the Invention]

[0004] To address the aforementioned problems, a pump is provided, comprising a drive assembly, a housing assembly, and a rotating assembly. The housing assembly includes a first housing and a water distribution plate, which are sealed and fixed together. A receiving cavity is formed within the pump. The rotating assembly includes an impeller, a rotor, and a shaft. The pump further includes a bearing bracket, which is fixed or positioned to the water distribution plate and / or the first housing, thereby dividing the receiving cavity into a first sub-cavity and a second sub-cavity. A portion of the impeller is located within the second sub-cavity, and the rotor is located within the first sub-cavity. The bearing bracket also has multiple through holes, each with an equivalent diameter of 4–6 mm, which connect the first and second sub-cavities.

[0005] Such a pump, by setting a bearing bracket with multiple through holes, the equivalent diameter of which is 4 to 6 mm, connects the first sub-cavity and the second sub-cavity. Part of the fluid in the first sub-cavity can enter the second sub-cavity through the through holes, and the fluid entering the second sub-cavity can flush away mud and sand. Attached Figure Description

[0006] Figure 1 This is a three-dimensional schematic diagram of the pump in an embodiment of the present invention;

[0007] Figure 2 yes Figure 1 A cross-sectional schematic diagram of the pump in the embodiment shown;

[0008] Figure 3 yes Figure 2 A magnified view of a portion of the image;

[0009] Figure 4 yes Figure 1The illustrated embodiment shows a front view of the pump's bearing bracket.

[0010] Figure 5 yes Figure 4 Cross-sectional view. Detailed Implementation

[0011] The technical solution of the specific implementation method is described below with reference to the accompanying drawings.

[0012] It should be noted that although this specification has described the present invention in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify, combine or make equivalent substitutions to the present invention, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

[0013] refer to Figures 1-2 A pump, applicable to household appliances such as dishwashers, but not limited thereto, includes a drive assembly, a housing assembly, and a rotating assembly. The housing assembly has a pump inlet pipe 31 and a pump outlet pipe 32. The housing assembly includes a first housing 11 and a water distribution plate 12, which are sealed together to form a receiving cavity within the pump. The rotating assembly includes an impeller 51, a rotor 52, and a shaft 53, with the rotor 52 and shaft 53 located within the receiving cavity, and a portion of the impeller 51 also located within the receiving cavity.

[0014] The pump also includes a bearing bracket 4. In this embodiment, the bearing bracket 4 is fixed or limited to the water distribution plate 12 and / or the first housing 11, so that the accommodating cavity is divided into a first sub-cavity 111 and a second sub-cavity 112. Part of the impeller 51 is located in the first sub-cavity 111, and the rotor 52 is located in the second sub-cavity 112.

[0015] The water distribution plate 12 includes a bottom wall with a first bearing. One end of the rotating shaft 53 passes through the first bearing and is limited thereto. The other end of the rotating shaft 53 is fixed to the impeller 51.

[0016] like Figure 4 and Figure 5As shown, in this embodiment, the bearing bracket 4 includes a main body 40, a first mating part 42, and a second mating part 43, wherein the first mating part 42 is located on the outer periphery of the main body 40, and the second mating part 43 is located on the inner periphery of the main body 40. The first mating part 42 includes a flange 421 and an extension 422, wherein the flange 421 extends axially from the connection between the first mating part 42 and the main body 40 toward the rotating shaft, and the extension 422 is connected to the flange 421 and is perpendicular to the axis of the rotating shaft. At least a portion of the extension 422 is limited or fixed between the water distribution plate 12 and the first housing 11. In this embodiment, at least a portion of the extension 422 is clamped between the water distribution plate 12 and the first housing 11.

[0017] The second mating part 43 has a cylindrical structure, including a cylindrical wall part 433 and a bottom wall part 434. The second mating part 43 has a receiving cavity 432 and a through hole 431, wherein the through hole 431 penetrates the bottom wall part 434. A second bearing 401 is disposed within the receiving cavity 432 and is riveted into the receiving cavity 432, resulting in an interference fit between the second bearing 401 and the cylindrical wall part 433. A seal 402 is also provided between the cylindrical wall part 433 and the second bearing 401. The seal 402 improves the fixing performance between the second bearing 401 and the bearing bracket 4, and also absorbs vibrations during shaft rotation through the elastic properties of the seal, thereby improving the support stability of the bearing bracket for the rotating shaft.

[0018] like Figures 2 to 5 As shown, the bearing bracket 4 is located between the rotor 52 and the impeller 51. The rotating shaft 53 passes through the second bearing 401, and the rotating shaft 53 and the second bearing 401 are rotatably fitted together. Furthermore, a magnetic ring 521 is provided on the side of the rotor 52 facing the second bearing 401. The magnetic ring 521 can be made of ceramic material, and the side of the magnetic ring 521 facing the second bearing 401 and the side of the second bearing 401 facing the magnetic ring 521 are in sliding fit when they contact each other. By providing the bearing bracket 4, the stability of the rotating assembly during rotation can be improved. On the other hand, when the impeller 51 rotates, the rotating assembly will move as a whole away from the pump inlet pipe 31. The sliding fit between the magnetic ring 521 and the second bearing 401 serves to limit the movement and maintain the rotational stability of the rotating assembly.

[0019] The first mating part 42 has a first end 423 near the impeller 51, and the second mating part 43 has a second end 435 away from the impeller 51. Along the axial direction of the rotating shaft 53, there is a certain distance between the first end 423 and the second end 435. The inner circumference of the main body 40 is connected to the second end 435, and the outer circumference of the main body 40 is connected to the first end 423, making the main body 40 have a generally frustum-shaped structure. The larger diameter end of the main body 40 is close to the impeller 51, and the smaller diameter end is close to the rotor 52. This improves the strength of the bearing support, thereby enhancing the rotational stability of the rotating assembly.

[0020] like Figure 4 and Figure 5 As shown, the bearing bracket 4 also has multiple through holes 41, and the main body 40 includes multiple reinforcing ribs 401. The through holes 41 penetrate the main body 40 and are located between adjacent reinforcing ribs 401. The through holes 41 are symmetrically distributed in the main body 40. By providing through holes 41 and reinforcing ribs 401, the strength of the bearing bracket 4 can be improved, enabling it to adapt to higher rotational speeds of the rotating assembly, and the weight of the bearing bracket 4 can also be reduced.

[0021] Furthermore, the equivalent diameter of the through hole 41 is 4 to 6 mm, and the number of through holes 41 is 3 to 8. For example, in this embodiment, the number of through holes 41 is 6. In this way, when the impeller rotates, a vacuum state is created in the part of the through hole 431 near the bearing support. Even if the mud and sand enter the bearing hole from the high pressure to the low pressure, due to the rotation of the impeller, some of the fluid in the first sub-cavity 111 can enter the second sub-cavity 112 through the through hole 41. The fluid entering the second sub-cavity 112 has a certain flow velocity and can enter the through hole 431 of the bearing support to flush away the mud and sand, which can prevent the mud and sand from adhering between the shaft and the bearing.

[0022] In order to improve the efficiency of the fluid entering the second sub-cavity 112 in flushing out impurities such as mud and sand, and reduce the pump efficiency loss caused by the fluid entering the second sub-cavity 112, the vertical distance d between the center of the through hole 41 and the rotation center line of the shaft 53 and the vertical distance D1 between the outer peripheral edge of the bearing bracket and the rotation center line of the shaft 53 must satisfy d≥3 / 4D1.

[0023] The first housing 11 also includes a flow guide 113 with a flow guide groove 114. The flow guide cooperates with the impeller, dividing the first sub-cavity 111 into a first region 115 and a second region 116. The second region 116 is closer to the bearing support than the first region 115. The first region 115 is connected to the channel 311 in the pump inlet pipe 31, and the second region 116 is connected to the through hole 41. The flow guide groove connects the first region 115 to the channel in the pump outlet pipe 32. Thus, when the impeller rotates, most of the fluid after being acted upon by the impeller flows out of the pump through the channel in the pump outlet pipe 32 after passing through the first region and the flow guide groove. A small portion of the fluid remains in the second region. Due to the rotation of the impeller, the second region is under negative pressure, causing the fluid in the second region to flow into the second sub-cavity 112 at a certain speed under negative pressure. This not only provides a good flushing effect but also minimizes the loss of pump efficiency.

[0024] To better facilitate the flushing of impurities by the fluid, the vertical distance d between the center of the through hole 41 and the rotation center line of the shaft 53 and the vertical distance D2 between the outer peripheral edge of the impeller and the rotation center line of the shaft 53 must satisfy d≥1 / 2D2.

[0025] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pump comprising a drive assembly, a housing assembly, and a rotating assembly, the housing assembly comprising a first housing (11) and a water distribution plate (12), the first housing (11) and the water distribution plate (12) being sealed and fixed, a receiving cavity being formed inside the pump, the rotating assembly comprising an impeller (51), a rotor (52), and a rotating shaft (53), characterized in that, The pump also includes a bearing bracket (4), which is fixed or limited to the water distribution plate and / or the first housing, so that the accommodating cavity is divided into a first sub-cavity (111) and a second sub-cavity (112). The impeller is located in the second sub-cavity, and the rotor is located in the first sub-cavity. The bearing bracket (4) also has a plurality of through holes (41), the equivalent diameter of which is 4 to 6 mm. The through holes (41) connect the first sub-cavity (111) and the second sub-cavity (112). Part of the fluid in the first sub-cavity (111) enters the second sub-cavity (112) through the through holes (41) and can flush out mud and sand. The vertical distance d between the center of the through hole (41) and the rotation center line of the shaft (53) and the vertical distance D1 between the outer peripheral edge of the bearing bracket and the rotation center line of the shaft (53) satisfy d ≥ 3 / 4D1. The number of through holes (41) is 3 to 8.

2. The pump according to claim 1, characterized in that, The perpendicular distance d between the center of the through hole (41) and the rotation center line of the shaft (53) and the perpendicular distance D2 between the outer peripheral edge of the impeller and the rotation center line of the shaft (53) satisfy d≥3 / 4D2.

3. The pump according to claim 1 or 2, characterized in that, The bearing bracket (4) includes a main body (40), a first mating part (42) and a second mating part (43). The first mating part (42) is located on the outer periphery of the main body (40), and the second mating part (43) is located on the inner periphery of the main body (40). The first mating part (42) includes a flange (421) and an extension (422). The flange extends axially from the connection between the first mating part and the main body to the rotating shaft. The extension is connected to the flange and is perpendicular to the axis of the rotating shaft. At least a portion of the extension is limited or fixed between the water distribution plate and the first housing.

4. The pump according to claim 3, characterized in that, The second mating part is cylindrical and includes a cylindrical wall and a bottom wall. The second mating part has a receiving cavity and a through hole. The through hole passes through the bottom wall. A second bearing is provided in the receiving cavity. A sealing element is also provided between the cylindrical wall and the second bearing.

5. The pump according to claim 4, characterized in that, The bearing support is located between the rotor and the impeller. The rotating shaft passes through the second bearing and is rotatably engaged with the second bearing. The rotor is provided with a magnetic ring on the side facing the second bearing. The side of the magnetic ring facing the second bearing and the side of the second bearing facing the magnetic ring are in sliding engagement when they are in contact with each other.

6. The pump according to claim 5, characterized in that, The first mating part has a first end near the impeller, and the second mating part has a second end away from the impeller. In the axial direction of the rotating shaft, there is a certain distance between the first end and the second end. The inner circumferential side of the main body is connected to the second end, and the outer circumferential side of the main body is connected to the first end. The main body has a generally frustum-shaped structure, and the large-diameter end of the main body is close to the impeller, and the small-diameter end of the main body is close to the rotor.

7. The pump according to claim 6, characterized in that, The main body includes multiple reinforcing ribs, and the through holes penetrate the main body. The through holes are located between adjacent reinforcing ribs and are symmetrically distributed in the main body.

8. The pump according to any one of claims 3-7, characterized in that, The first housing also has a flow guide portion with a flow guide groove. The flow guide portion cooperates with the impeller to divide the first sub-cavity into a first area and a second area. The second area is closer to the bearing bracket than the first area. The second area communicates with the through hole, and the flow guide groove communicates with the first area.

Images