Draining pump

Abstract

The utility model discloses a drainage pump which comprises a shielding sleeve (20), a stator core (30) and a rotor part (70), the shielding sleeve (20) is provided with a rotor inner cavity (23), the rotor part (70) is located in the rotor inner cavity (23), the stator core (30) comprises a pole shoe part, the pole shoe part and the shielding sleeve (20) form an integrated structure through injection molding, and the rotor part (70) is located in the rotor inner cavity (23). The shielding sleeve (20) comprises a thin-wall-shaped isolation layer (24), the isolation layer (24) is attached to the inner circumferential wall of the pole shoe component, and at least one part of the rotor inner cavity (23) is formed by the inner wall of the isolation layer (24). The drainage pump can reduce the air gap between the stator core and the rotor, thereby improving the motor efficiency, reducing the size and weight, and reducing the cost.

Description

Technical Field

[0001] The utility model relates to the technical field of cleaning equipment, in particular to a drainage pump. Background Art

[0002] Equipment such as washing machines or dishwashers are usually equipped with a drain pump. Taking a washing machine as an example, its drain pump is used to drain water from the inner drum of the washing machine. In order to ensure electrical safety, a shielding shell structure is required to separate water and live components.

[0003] Generally, a drainage pump uses a shielded shell, the stator core is placed outside the shielded shell, and the rotor is inside the shielded shell. Since the rotor cavity is filled with water, the shielding sleeve must have a certain strength. The shielding shell is set between the stator core and the rotor, so that the air gap between the stator core and the rotor is equal to the sum of the thickness of the shielding shell and the assembly gap, which easily leads to a large air gap between the stator core and the rotor, low pump efficiency, and high energy consumption. Utility Model Content

[0004] The utility model aims to provide a drainage pump, which can reduce the air gap between the stator core and the rotor, thereby improving the motor efficiency.

[0005] To achieve the above-mentioned purpose, the utility model provides a drainage pump, including a shielding sleeve, a stator core and a rotor component, the shielding sleeve is provided with a rotor inner cavity, the rotor component is located in the rotor inner cavity, the stator core includes a pole shoe component, the pole shoe component and the shielding sleeve are formed into an integral structure by injection molding, the shielding sleeve includes a thin-walled isolation layer, the isolation layer is adhered to the inner circumferential wall of the pole shoe component, and the inner wall of the isolation layer forms at least a part of the rotor inner cavity.

[0006] The drainage pump provided by the utility model is formed into an integral structure by injection molding of a pole shoe component and a shielding sleeve. The shielding sleeve includes a thin-walled isolation layer, which is attached to the inner circumferential wall of the shoe component. The inner wall of the isolation layer forms at least a part of the rotor cavity, which can relatively reduce the air gap between the stator core and the rotor component and relatively improve the motor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A schematic diagram of the overall structure of a drainage pump provided by an embodiment of the utility model;

[0008] Figure 2 for Figure 1 A longitudinal sectional view of the drain pump shown;

[0009] Figure 3 for Figure 1 A transverse cross-sectional view of the drainage pump shown at the split stator core;

[0010] Figure 4 for Figure 3 A partial enlarged view of the isolation layer shown in;

[0011] Figure 5 It is a schematic diagram of press-fitting the pole arm component, the first pole shoe component, and the second pole shoe component;

[0012] Figure 6 It is a schematic diagram of the partial structure of the first pole shoe component, the second pole shoe component and the shielding sleeve being integrally injection molded.

[0013] In the figure:

[0014] 10. Coil 20. Shielding sleeve 21. Shielding sleeve 22. Mounting cover 23. Rotor inner cavity 24. Isolation layer 30. Stator core 31. First pole shoe component 311. First mounting groove 312. First positioning groove 32. Second pole shoe component 321. Second mounting groove 322. Second positioning groove 33. Pole arm component 331. First mounting boss 332. Second mounting boss 40. Pump body assembly 50. Upper bearing seat 60. Shielding sleeve component 70. Rotor component 80. Center shaft 90. Lower bearing seat 100. Impeller. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0016] In this article, the terms "upper, lower, inside, outside" and the like are established based on the positional relationships shown in the drawings. The corresponding positional relationships may also change depending on the drawings, and therefore cannot be understood as absolute limitations on the scope of protection; moreover, relational terms such as "first" and "second" and the like are merely used to distinguish one component from another with the same name, and do not necessarily require or imply any actual relationship or order between these components.

[0017] Please refer to Figures 1 to 4 , Figure 1 A schematic diagram of the overall structure of a drainage pump provided by an embodiment of the utility model; Figure 2 for Figure 1 A longitudinal sectional view of the drain pump shown; Figure 3 for Figure 1 A transverse cross-sectional view of the drainage pump shown at the split stator core; Figure 4 for Figure 3 A partial enlarged view of .

[0018] As shown in the figure, in a specific embodiment, the drain pump provided by the utility model can be used in equipment such as washing machines or dishwashers, or other electrical appliances that require drainage drive. The structure of the drain pump is mainly explained below by taking the drain pump used in a washing machine as an example.

[0019] The drainage pump is mainly composed of four parts, namely a coil 10, a shielding sleeve 20, a stator core 30 and a pump body assembly 40, wherein the shielding sleeve 20 is further divided into a shielding sleeve 21 and a mounting cover 22, the shielding sleeve 21 has a small diameter portion located at the upper end, a large diameter portion located in the middle, and a rectangular portion located at the lower end, and the mounting cover 22 is disc-shaped and is located below the rectangular portion of the shielding sleeve 21 for connecting with the pump body assembly 40.

[0020] A rotor component 70 is provided inside the shielding sleeve 21, and the rotor component is provided with a central axis 80. An upper bearing seat 50 is provided at the upper end of the central axis 80, and a lower bearing seat 90 is provided at the lower end of the central axis 50. When the rotor component 70 rotates, it can drive the impeller 100 to rotate together, and then promote the flow of water in the pump body assembly 40 through the impeller 100.

[0021] The center of the shielding sleeve 20 is provided with a rotor inner cavity 23 for installing a rotor component 70. The stator core 30 is mainly composed of a first pole shoe component 31, a second pole shoe component 32 and a pole arm component 33. The first pole shoe component 31, the second pole shoe component 32 and the pole arm component 33 are all multi-layer silicon steel sheet structures. The first pole shoe component 31 and the second pole shoe component 32 are located inside the shielding sleeve 20 and are integrally injection molded with the rectangular portion of the shielding sleeve 21. The three together form a shielding sleeve component 60. The two ends and the outer sides of the first pole shoe component 31 and the second pole shoe component 32 are planar shapes, and the inner shapes are described below.

[0022] Part of the material of the shielding sleeve 20 forms an isolation layer 24 close to the inner wall of the first pole shoe component 31 and the second pole shoe component 32. Since the shielding sleeve 20 is made of plastic, the isolation layer 24 is a thin-walled plastic layer, and the inner wall of the isolation layer 24 is at least a part of the rotor inner cavity 23.

[0023] In this embodiment (see Figure 4 ), the rotor cavity 23 is circular in cross section, and the isolation layer 24 has a first part a, a transition part b and a second part c in a clockwise or counterclockwise direction, the thickness of the first part a is greater than the thickness of the second part c, the thickness of the transition part b gradually decreases from the first part a to the second part c, and the thickness of the thinnest part is between 0.5mm-1.5mm, while the thickness of a general shielding sleeve is above 2mm, and the thickness of the isolation layer 24 of the first pole shoe component 31 and the second pole shoe component 32 is rotationally symmetrical in the circumferential direction.

[0024] By using the pole shoe component as an insert and integrally injection molding with the shielding sleeve 20, the plastic layer covering the inner surface of the inner wall of the pole shoe component can be made as thin as possible, so that the gap between the rotor component 70 and the pole shoe component is as small as possible, while ensuring the pressure resistance of the shielding sleeve 20, thereby making the air gap between the stator core 30 and the rotor component 70 as small as possible, thereby improving the motor efficiency, thereby reducing the weight of the coil 10 and reducing the coil cost.

[0025] In another embodiment, the rotor inner cavity 23 is circular in cross section, and the isolation layer 24 has a uniform thickness between 0.5 mm and 1.5 mm, which can also achieve corresponding technical effects.

[0026] In another embodiment, the rotor inner cavity 23 is circular in cross section, and the thickness of the isolation layer 24 gradually becomes thinner in the clockwise or counterclockwise direction, with the thickness at the thinnest point being between 0.5 mm and 1.5 mm, which can also achieve corresponding technical effects.

[0027] Please refer to Figure 4 , Figure 5 , Figure 4 It is a schematic diagram of press-fitting the pole arm component, the first pole shoe component, and the second pole shoe component; Figure 5 It is a schematic diagram of the partial structure of the first pole shoe component, the second pole shoe component and the shielding sleeve being integrally injection molded.

[0028] The first pole shoe component 31 and the second pole shoe component 32 are respectively provided with a first mounting groove 311 and a second mounting groove 321 at one end exposed from the shielding sleeve, and the pole arm component 33 is "U"-shaped, with a first mounting boss 331 adapted to the first mounting groove 311 and a second mounting boss 332 adapted to the second mounting groove 321 at its two ends.

[0029] One end of the first pole shoe component 31 and the second pole shoe component 32 which are integrally injection-molded with the shielding sleeve 20 is respectively provided with a first positioning groove 312 and a second positioning groove 322 , and the interiors of the first positioning groove 312 and the second positioning groove 322 are filled with the material of the shielding sleeve 20 .

[0030] The first mounting groove 311 and the second mounting groove 321 have different shapes, the first positioning groove 312 and the second positioning groove 322 have different shapes, and the first mounting groove 311 has the same shape as the second positioning groove 322 , and the second mounting groove 321 has the same shape as the first positioning groove 312 .

[0031] In this way, the first mounting boss 331 is matched with the first mounting groove 311, the second mounting boss 332 is matched with the second mounting groove 321, and the first mounting boss 331 cannot be installed in the second mounting groove 321, and the second mounting boss 332 cannot be installed in the first mounting groove 311. With this structure, it is possible to avoid the pole shoe component from being installed in the wrong position, avoid the stator core 30 from being assembled incorrectly, and make the two pole shoe components required by the stator core 30 interchangeable, thereby reducing the number of required molds.

[0032] Specifically, the first mounting groove 311, the second mounting groove 321, the first positioning groove 312 and the second positioning groove 322 all include a semicircular head and a neck with a width less than the diameter of the semicircular head, and the shapes of the first mounting boss 331 and the second mounting boss 332 are consistent with the shapes of the first mounting groove 311 and the second mounting groove 321; the neck length of the first mounting groove 311 is greater than the neck length of the second mounting groove 321; the neck length of the first positioning groove 312 is less than the neck length of the second positioning groove 322.

[0033] During assembly, the coil 10 is put onto the pole arm component 33, and then the first mounting boss 331 of the pole arm component 33 is aligned with the first mounting groove 311 of the first pole shoe component 31, and the second mounting boss 332 of the pole arm component 33 is aligned with the second mounting groove 321 of the second pole shoe component 32, and the coil 10 and the pole arm component 33 are pressed into the shielding sleeve component 60 by press-fitting.

[0034] The above embodiments are only preferred solutions of the present invention and are not limited thereto. On this basis, targeted adjustments can be made according to actual needs to obtain different implementations. For example, the first mounting groove 311, the second mounting groove 321, the first positioning groove 312, and the second positioning groove 322 can be designed into other shapes suitable for press-fitting, etc. Since there are many possible implementation methods, they will not be described one by one here.

[0035] The drainage pump provided by the utility model is introduced in detail above. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A drainage pump, characterized in that: The invention comprises a shielding sleeve (20), a stator core (30) and a rotor component (70), wherein the shielding sleeve (20) is provided with a rotor inner cavity (23), the rotor component (70) is located in the rotor inner cavity (23), the stator core (30) comprises a pole shoe component, the pole shoe component and the shielding sleeve (20) are formed into an integral structure by injection molding, and the shielding sleeve (20) comprises a thin-walled isolation layer (24), the isolation layer (24) is attached to the inner peripheral wall of the pole shoe component, and the inner wall of the isolation layer (24) forms at least a part of the rotor inner cavity (23).

2. The drainage pump according to claim 1, characterized in that: The pole shoe component comprises a first pole shoe component (31) and a second pole shoe component (32); the rotor inner cavity (23) is circular in cross section; and the isolation layers (24) of the first pole shoe component (31) and the second pole shoe component (32) have a uniform thickness ranging from 0.5 mm to 1.5 mm.

3. The drainage pump according to claim 1, characterized in that: The pole shoe component comprises a first pole shoe component (31) and a second pole shoe component (32); the rotor inner cavity (23) is circular in cross section; the thickness of the isolation layer (24) of the first pole shoe component (31) and the second pole shoe component (32) gradually becomes thinner in a clockwise or counterclockwise direction, and the thickness at the thinnest part is between 0.5 mm and 1.5 mm.

4. The drainage pump according to claim 1, characterized in that: The pole shoe component comprises a first pole shoe component (31) and a second pole shoe component (32); the rotor inner cavity (23) is circular in cross section; the isolation layer (24) of the first pole shoe component (31) and the second pole shoe component (32) comprises a first portion (a), a transition portion (b) and a second portion (c) in a clockwise or counterclockwise direction; the thickness of the first portion (a) is greater than the thickness of the second portion (c); and the thickness of the transition portion (b) gradually becomes thinner from the first portion (a) to the second portion (c).

5. The drainage pump according to claim 3 or 4, characterized in that: The thickness of the isolation layer (24) of the first pole shoe component (31) and the second pole shoe component (32) is rotationally symmetric in the circumferential direction.

6. The drainage pump according to any one of claims 2 to 4, characterized in that: It also comprises a pole arm component (33), wherein one end of the first pole shoe component (31) and the second pole shoe component (32) exposed outside the shielding sleeve (20) is respectively provided with a first mounting groove (311) and a second mounting groove (321), and the pole arm component (33) is in a "U" shape, and two ends thereof are provided with a first mounting boss (331) adapted to the first mounting groove (311) and a second mounting boss (332) adapted to the second mounting groove (321).

7. The drainage pump according to claim 6, characterized in that: One end of the first pole shoe component (31) and the second pole shoe component (32) integrally injection-molded with the shielding sleeve (20) is respectively provided with a first positioning groove (312) and a second positioning groove (322), and the interiors of the first positioning groove (312) and the second positioning groove (322) are filled with the material of the shielding sleeve (20).

8. The drainage pump according to claim 7, characterized in that: The first mounting groove (311) and the second mounting groove (321) have different shapes, the first positioning groove (312) and the second positioning groove (322) have different shapes, the shape of the first mounting groove (311) is the same as the shape of the second positioning groove (322), and the shape of the second mounting groove (321) is the same as the shape of the first positioning groove (312).

9. The drainage pump according to claim 8, characterized in that: The first mounting groove (311), the second mounting groove (321), the first positioning groove (312) and the second positioning groove (322) all comprise a semicircular head and a neck with a width smaller than the diameter of the semicircular head; the shapes of the first mounting boss (331) and the second mounting boss (332) match the shapes of the first mounting groove (311) and the second mounting groove (321); the neck length of the first mounting groove (311) is greater than the neck length of the second mounting groove (321); and the neck length of the first positioning groove (312) is less than the neck length of the second positioning groove (322).

10. The drainage pump according to claim 9, characterized in that: It also includes a coil (10), wherein the coil (10) is sleeved on the pole arm component (33).

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