Draining pump and impeller thereof

Abstract

The utility model discloses a draining pump and an impeller thereof. The impeller comprises a rotating shaft, the pump blades are distributed in the circumferential direction of the rotating shaft at intervals and are in central symmetry relative to the central axis of the rotating shaft, the inner end of each pump blade is connected with the outer circumferential face of the rotating shaft in the radial direction of the rotating shaft, the outer end of each pump blade is a free end, and the pump blades are connected with the outer circumferential face of the rotating shaft with the rotating shaft as the center. And each pump blade is an arc-shaped piece which is bent anticlockwise or clockwise. According to the impeller, the arc-shaped pump blades are adopted, so that energy loss caused by interaction of the pump blades and fluid during water fetching can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of drainage pumps, and more specifically, to a drainage pump and an impeller thereof. Background Art

[0002] During the operation of the refrigeration system, when the air conditioner is running, such as during refrigeration and dehumidification, due to the cooling effect of the heat exchanger on the surrounding air, a large amount of condensed water is generated on the surface of the heat exchanger. When the condensed water accumulates to a certain extent, it will drip into the condensate water receiving tray below the heat exchanger. Therefore, a fluid discharging device needs to be installed in the receiving tray to discharge the condensed water in the receiving tray to the outside. The blades in the existing drainage pumps are straight, and when pumping water, the pump blades interact with the fluid, which easily leads to energy loss. Summary of the Utility Model

[0003] An object of the utility model is to provide an impeller that can at least solve the technical problem that the blades in the existing drainage pumps are straight, and when pumping water, the pump blades interact with the fluid, which easily leads to energy loss.

[0004] The utility model also provides a drainage pump including the above impeller.

[0005] In order to achieve the above object, the utility model provides the following technical solutions.

[0006] The impeller according to the first aspect embodiment of the utility model includes: a rotating shaft; an even number of pump blades, the even number of pump blades are circumferentially spaced apart around the rotating shaft and are centrosymmetric with respect to the central axis of the rotating shaft. Along the radial direction of the rotating shaft, the inner end of each pump blade is connected to the outer peripheral surface of the rotating shaft, and the outer end of each pump blade is a free end. Taking the rotating shaft as the center, each pump blade is an arc-shaped member that is bent counterclockwise or clockwise.

[0007] Optionally, the pump blade includes: a first section, the inner end of the first section is connected to the rotating shaft; a second section, the inner end of the second section is connected to the outer end of the first section; wherein, along the axial direction of the rotating shaft, the size of the inner end of the first section is larger than the size of the outer end of the first section and the second section; and / or, the bending degree of the first section is less than the bending degree of the second section.

[0008] Optionally, the first section includes: a first connecting portion, the inner end of the first connecting portion is connected to the outer peripheral surface of the rotating shaft, and the first connecting portion is a straight member extending along the radial direction of the rotating shaft; a second connecting portion, the inner end of the second connecting portion is connected to the outer end of the first connecting portion, and the outer end of the second connecting portion is connected to the inner end of the second section.

[0009] Optionally, the rotating shaft includes: a first shaft body which is cylindrical, and the inner end of the first section is disposed on the outer periphery of the first shaft body and extends along the axial direction of the first shaft body; a second shaft body which is cylindrical and coaxially arranged and connected with the first shaft body, and the radial dimension of the second shaft body is greater than that of the first shaft body.

[0010] Optionally, the rotating shaft further includes: a third shaft body, the cross-section of the third shaft body is circular and the longitudinal section is semi-circular, the third shaft body is located between the first shaft body and the second shaft body, the third shaft body is respectively connected with the first shaft body and the second shaft body, and the third shaft body, the first shaft body and the second shaft body are coaxially arranged; wherein, the inner end of the first section is simultaneously connected with the third shaft body, the first shaft body and the second shaft body.

[0011] Optionally, the number of the pump blades is four, and the four pump blades are divided into a first pump blade, a second pump blade, a third pump blade and a fourth pump blade. The first pump blade and the third pump blade are centrosymmetric with respect to the central axis of the rotating shaft, and the second pump blade and the fourth pump blade are centrosymmetric with respect to the central axis of the rotating shaft.

[0012] Optionally, the inner end of the first pump blade is connected to the rotating shaft at a first position, the inner end of the second pump blade is connected to the rotating shaft at a second position, the inner end of the third pump blade is connected to the rotating shaft at a third position, and the inner end of the fourth pump blade is connected to the rotating shaft at a fourth position. Among them, the first position and the third position are located at both ends of a first diameter of the rotating shaft, the second position and the fourth position are located at both ends of a second diameter of the rotating shaft, and the first diameter and the second diameter are perpendicular to each other.

[0013] Optionally, in the axial direction of the rotating shaft, along the inner end of the pump blade towards the outer end of the pump blade, the size of the pump blade gradually decreases.

[0014] Optionally, in the axial direction of the rotating shaft, the outer surface of the pump blade includes: a first side surface and a second side surface. In the axial direction of the rotating shaft, the height difference between the two ends of the first side surface is greater than the height difference between the two ends of the second side surface.

[0015] The drainage pump according to the second aspect embodiment of the present invention includes: a housing having a receiving space; an impeller, at least a part of the impeller is located in the receiving space, and the impeller is the impeller according to any one of the above.

[0016] By adopting an arc-shaped pump blade, the impeller according to the embodiment of the present invention can improve the motor performance of the drainage pump.

[0017] Other features and advantages of the present utility model will become clear from the following detailed description of exemplary embodiments of the present utility model with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings incorporated in and forming a part of this specification illustrate embodiments of the present utility model and, together with the description, serve to explain the principles of the present utility model.

[0019] Figure 1 FIG. is a schematic structural diagram of a drainage pump according to an embodiment of the present utility model;

[0020] Figure 2 FIG. is a partial structural schematic diagram of a drainage pump according to an embodiment of the present utility model;

[0021] Figure 3 FIG. is a schematic structural diagram of an impeller of a drainage pump according to an embodiment of the present utility model;

[0022] Figure 4 FIG. is a schematic structural diagram of a pump cover of a drainage pump according to an embodiment of the present utility model;

[0023] Figure 5 FIG. is a partial schematic diagram of a drainage pump according to an embodiment of the present utility model;

[0024] Figure 6 FIG. is a schematic structural diagram of an impeller of the prior art;

[0025] Figure 7 FIG. is a schematic structural diagram of a drainage pump of the prior art.

[0026] REFERENCE NUMERALS IN THE DRAWINGS

[0027] Drainage pump 100;

[0028] Impeller 10;

[0029] Rotating shaft 11;

[0030] First shaft body 111; Second shaft body 112; Third shaft body 113;

[0031] Pump blade 12;

[0032] First section body 121; First connecting portion 1211; Second connecting portion 1212;

[0033] Second section body 122;

[0034] First pump blade 123;

[0035] Second pump blade 124;

[0036] Third pump blade 125;

[0037] The fourth pump blade 126;

[0038] The first side surface 127;

[0039] The housing 20;

[0040] The pump cover 21; the base body 22;

[0041] The impeller 10';

[0042] Position A; Position B; Position C; Position D. Specific embodiments

[0043] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0044] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present invention or its application or use.

[0045] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be regarded as part of the specification.

[0046] In all the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0047] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0048] The impeller 10 according to an embodiment of the present invention will be specifically described below with reference to the accompanying drawings.

[0049] As Figures 1 to 5 shown, the impeller 10 according to an embodiment of the present invention includes: a rotating shaft 11 and an even number of pump blades 12.

[0050] Specifically, the even number of pump blades 12 are circumferentially spaced apart around the rotating shaft 11 and are centrosymmetric with respect to the central axis of the rotating shaft 11. Along the radial direction of the rotating shaft 11, the inner end of each pump blade 12 is connected to the outer peripheral surface of the rotating shaft 11, and the outer end of each pump blade 12 is a free end. With the rotating shaft 11 as the center, each pump blade 12 is an arcuate member that bends counterclockwise or clockwise. For example, the pump blade 12 is a curved member in the shape of a "L" and bends counterclockwise.

[0051] In other words, for the impeller 10 according to the embodiment of the present utility model, the rotating shaft 11 is combined with a plurality of pump blades 12. The plurality of pump blades 12 are distributed on the outer periphery of the rotating shaft 11, and each pump blade 12 is an arc-shaped member. Moreover, the number of pump blades 12 is an even number. For example, the number of pump blades 12 is 2, 4, 6, or 8, etc. Another example is that the rotating shaft 11 is a cylindrical member extending in the vertical direction, the number of pump blades 12 is four, and the four pump blades 12 are spaced apart along the circumferential direction of the cylindrical member, and each pump blade 12 extends substantially in the horizontal direction.

[0052] Among them, in the radial direction of the rotating shaft 11, one end of each pump blade 12 is connected to the outer surface of the rotating shaft 11, and the other end of each pump blade 12 is a free end. For example, one radial direction of the rotating shaft 11 is from left to right, the left end of a pump blade 12 is connected to the outer surface of the rotating shaft 11, and the right end is a free end. Or the direction close to the rotating shaft 11 is defined as the inner side, and the direction away from the rotating shaft 11 is defined as the outer side, that is, the inner end of each pump blade 12 is connected to the outer peripheral surface of the rotating shaft 11, and the outer end of each pump blade 12 is a free end.

[0053] In addition, the even number of pump blades 12 are spaced apart along the circumferential direction of the rotating shaft 11 and are centrosymmetric with respect to the central axis of the rotating shaft 11. That is to say, the plurality of pump blades 12 can be divided into two groups, and the two pump blades 12 in each group are centrosymmetric with respect to the rotating shaft 11. For example, the first pump blade and the third pump blade among the four pump blades 12 are centrosymmetric with respect to the rotating shaft 11, and the second pump blade and the fourth pump blade are centrosymmetric with respect to the rotating shaft 11. Another example is that the two pump blades 12 that are symmetric about 180° are taken as a group, and the two are centrosymmetric with respect to the rotating shaft 11. In this embodiment, by using an even number of pump blades 12 and a centrosymmetric design, the service life of the pump blades 12 can be extended, and the consistency of stability during operation can be achieved. In addition, the two centrosymmetric pump blades 12 can be regarded as a whole, and the strength can be improved compared with a single blade.

[0054] In addition, with the rotating shaft 11 as the center, each pump blade 12 is an arc-shaped member that bends counterclockwise or clockwise. That is to say, on the one hand, each pump blade 12 is an arc-shaped member. It can be understood that the arc-shaped member here means that at least a part of the middle of the pump blade 12 deviates from the connection line between the two ends of the pump blade 12. For example, there is a virtual connection line AA' between the left end A and the right end A' of the pump blade 12, and at least a part between A and A' of the pump blade 12 can deviate from the connection line AA'. Or rather, the pump blade 12 is an arc-shaped member and has both an arc-shaped concave surface and an arc-shaped convex surface, and both the concave surface and the convex surface bend counterclockwise or clockwise. On the other hand, the plurality of pump blades 12 can bend clockwise or counterclockwise at the same time.

[0055] Thus, for the impeller 10 according to the embodiment of the present utility model, on the one hand, by adopting an even number of pump blades 12 circumferentially spaced apart around the rotation axis 11 and centrosymmetric with respect to the central axis of the rotation axis 11, the working stability of the pump blades 12 can be improved, and the service life of the pump blades 12 can be extended; on the other hand, by adopting the pump blades 12 in an arc shape bent counterclockwise or clockwise, the resistance of the fluid during the rotation of the motor can be reduced, the energy loss caused by the interaction between the pump blades 12 and the fluid during water pumping can be reduced, the motor performance of the drainage pump 100 can be improved, and the energy utilization rate can be improved.

[0056] According to an embodiment of the present utility model, the pump blade 12 includes: a first section 121 and a second section 122. The inner end of the first section 121 is connected to the rotation axis 11; the inner end of the second section 122 is connected to the outer end of the first section 121. Wherein, along the axial direction of the rotation axis 11, the size of the inner end of the first section 121 is larger than the size of the outer end of the first section 121 and the second section 122. The large-area connection can enhance the strength of the pump blade 12, extend the service life, and can also increase the contact area between the pump blade 12 and the rotation axis 11, improving the bonding strength between the two; and / or, the bending degree of the first section 121 is less than the bending degree of the second section 122, which can realize the arc design of the pump blade 12, reducing the energy loss caused by the interaction between the pump blade 12 and the fluid during water pumping; and can reduce the bending degree at the connection position between the pump blade 12 and the rotation axis 11, improving the bonding stability. Moreover, through the combination of the first section 121 and the second section 122, not only can the overall structural stability of the impeller 10 be improved, but also it is beneficial to change the kinetic energy and pressure of the fluid to achieve the conversion of the fluid volume, improving the energy utilization rate of the water pump.

[0057] According to an embodiment of the present utility model, the first section 121 includes: a first connecting portion 1211 and a second connecting portion 1212. The inner end of the first connecting portion 1211 is connected to the outer peripheral surface of the rotation axis 11, and the first connecting portion 1211 is a straight member extending in the radial direction of the rotation axis 11; the inner end of the second connecting portion 1212 is connected to the outer end of the first connecting portion 1211, and the outer end of the second connecting portion 1212 is connected to the inner end of the second section 122. In this embodiment, by combining the first section 121 with the first connecting portion 1211 and the second connecting portion 1212, the first connecting portion 1211 has a straight-line structure, which is convenient for the processing of the first connecting portion 1211 and its connection with the rotation axis 11, and is also beneficial to realizing the centrosymmetric design. In addition, by connecting the first section 121 with a straight-line structure to the rotation axis 11, the connection between the curved surface and the rotation axis 11 can be further reduced, which is beneficial to improving the reliability of the connection position.

[0058] In some specific embodiments of the present utility model, the rotating shaft 11 includes: a first shaft body 111 and a second shaft body 112. The first shaft body 111 is cylindrical. The inner end of the first section body 121 is provided on the outer periphery of the first shaft body 111 and extends along the axial direction of the first shaft body 111. The second shaft body 112 is cylindrical and is coaxially arranged and connected with the first shaft body 111. The radial dimension of the second shaft body 112 is larger than the radial dimension of the first shaft body 111. For example, along the direction from top to bottom, the second shaft body 112 is located below the first shaft body 111 and extends along the up-and-down direction at the same time. In this embodiment, by adopting the second shaft body 112 with a larger radial dimension than the first shaft body 111, it is beneficial to ensure the structural strength and reliability, as well as the stability of connection with other surrounding structures. In addition, by adopting the first shaft body 111 with a smaller radial dimension, it is beneficial to ensure that the volume and size of the pump impeller 12 in a limited space are larger, thereby further improving the drainage effect. In addition, when the first connecting portion 1211 is connected to the first shaft body 111, the linear first connecting portion 1211 can be tangent to the outer peripheral surface of the first shaft body 111, which can improve the connection stability between the first connecting portion 1211 and the first shaft body 111 and ensure the connection firmness during clockwise or counterclockwise rotation.

[0059] According to an embodiment of the present utility model, the rotating shaft 11 further includes: a third shaft body 113. The cross-section of the third shaft body 113 is circular and the longitudinal section is semi-circular. The third shaft body 113 is located between the first shaft body 111 and the second shaft body 112. The third shaft body 113 is respectively connected to the first shaft body 111 and the second shaft body 112, and the third shaft body 113, the first shaft body 111 and the second shaft body 112 are coaxially arranged; wherein, the inner end of the first section body 121 is simultaneously connected to the third shaft body 113, the first shaft body 111 and the second shaft body 112. In this embodiment, by adopting the third shaft body 113, a smooth transition between the first shaft body 111 and the second shaft body 112 can be achieved. By simultaneously connecting the inner end of the first section body 121 to the third shaft body 113, the first shaft body 111 and the second shaft body 112, the bonding firmness between the inner end of the pump impeller 12 and the outer peripheral surface of the rotating shaft 11 can be ensured.

[0060] In some specific embodiments of the present utility model, the number of pump blades 12 is four. For the convenience of description, the four pump blades 12 can be defined as the first pump blade 123, the second pump blade 124, the third pump blade 125, and the fourth pump blade 126. The first pump blade 123 and the third pump blade 125 are centrosymmetric with respect to the central axis of the rotating shaft 11, and the second pump blade 124 and the fourth pump blade 126 are centrosymmetric with respect to the central axis of the rotating shaft 11. In this embodiment, by using four pump blades 12, the cost can be reduced while ensuring the drainage effect. When the inner ends of the first pump blade 123, the second pump blade 124, the third pump blade 125, and the fourth pump blade 126 are respectively connected to the first shaft body 111 through the first connecting portions 1211, the cross-sectional shape of the formed structure can be a cross-like shape, which is convenient for processing.

[0061] According to an embodiment of the present utility model, the inner end of the first pump blade 123 is connected to the rotating shaft 11 at the first position A, the inner end of the second pump blade 124 is connected to the rotating shaft 11 at the second position B, the inner end of the third pump blade 125 is connected to the rotating shaft 11 at the third position C, and the inner end of the fourth pump blade 126 is connected to the rotating shaft 11 at the fourth position D. Among them, the first position A and the third position C are located at both ends of the first diameter of the rotating shaft 11, the second position B and the fourth position D are located at both ends of the second diameter of the rotating shaft 11, and the first diameter and the second diameter are perpendicular to each other. In this embodiment, by defining the mutual positions of the first pump blade 123, the second pump blade 124, the third pump blade 125, and the fourth pump blade 126, not only can the symmetric center design be realized, but also it is beneficial to processing and manufacturing.

[0062] In some specific embodiments of the present utility model, in the axial direction of the rotating shaft 11, along the inner end of the pump blade 12 towards the outer end of the pump blade 12, the size of the pump blade 12 gradually decreases, avoiding sudden changes in the size of the pump blade 12, and can optimize the drainage effect.

[0063] According to an embodiment of the present utility model, in the axial direction of the rotating shaft 11, the outer surface of the pump blade 12 includes: the first side surface 127 and the second side surface. In the axial direction of the rotating shaft 11, the height difference between the two ends of the first side surface 127 is greater than the height difference between the two ends of the second side surface. For example, the first side surface 121 is the upper side surface of the pump blade 12, and the second side surface is the lower side surface of the pump blade 12. By the height difference between the two ends of the first side surface 127 being greater than the height difference between the two ends of the second side surface, it is beneficial to improve the drainage effect and is also beneficial to the installation of the pump blade 12, reducing the overall size of the impeller 10.

[0064] Optionally, the impeller 10 is an integrally formed part, which can improve the integrity and stability of the structure, is convenient for processing, and reduces the processing procedures.

[0065] In summary, according to the impeller 10 of the embodiment of the present utility model, by adopting the arc-shaped pump blades 12, the kinetic energy and pressure of the fluid can be changed to achieve the conversion of the fluid volume, and the energy utilization rate can be improved.

[0066] The present utility model also provides a drainage pump 100, including: a housing 20 and an impeller 10. The housing 20 has a receiving space, and at least a part of the impeller 10 is located in the receiving space. The impeller 10 is the impeller 10 of any one of the above embodiments. During assembly, as Figure 1 , Figure 2 , Figure 4 and Figure 5 shown, the impeller 10 etc. can be first assembled on the base body 22, and then the pump cover 21 is covered, and finally the drainage pump 100 is assembled.

[0067] As Figure 6 and Figure 7 show, in the prior art, the impeller 10' of the drainage pump adopts a conical structure, and the water pump flow rate of 400 mL / min and the head of 1200 mm can be achieved. It can be seen that the performance parameters of the motor are limited. For example, there are limitations on the flow rate / head, resulting in the motor being unable to break through to meet higher requirements. In contrast, in an embodiment of the present utility model, by adopting four arc-shaped pump blades 12, the water pump flow rate of 800 mL / min and the head of 2000 mm can be achieved. It can be seen that the motor performance of the drainage pump 100 can be improved by adopting the arc-shaped pump blades 12.

[0068] Although some specific embodiments of the present utility model have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for the purpose of illustration and not for the purpose of limiting the scope of the present utility model. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present utility model. The scope of the present utility model is defined by the appended claims.

Claims

1. An impeller (10), characterized in that: include: A rotation axis (11); An even number of pump blades (12) are distributed at intervals in the circumferential direction of the rotating shaft (11) and are centrally symmetrical with respect to the central axis of the rotating shaft (11); along the radial direction of the rotating shaft (11), the inner end of each pump blade (12) is connected to the outer peripheral surface of the rotating shaft (11); the outer end of each pump blade (12) is a free end; and with the rotating shaft (11) as the center, each pump blade (12) is an arc-shaped member that is bent counterclockwise or clockwise.

2. The impeller (10) according to claim 1, characterized in that: The pump blade (12) comprises: A first section (121), the inner end of the first section (121) being connected to the rotating shaft (11); A second section (122), the inner end of the second section (122) being connected to the outer end of the first section (121); Wherein, along the axial direction of the rotating shaft (11), the size of the inner end of the first segment (121) is larger than the size of the outer end of the first segment (121) and the size of the second segment (122); and / or, The curvature of the first section (121) is smaller than the curvature of the second section (122).

3. The impeller (10) according to claim 2, characterized in that: The first section (121) comprises: a first connecting portion (1211), the inner end of the first connecting portion (1211) being connected to the outer peripheral surface of the rotating shaft (11), and the first connecting portion (1211) being a straight piece extending in the radial direction of the rotating shaft (11); A second connecting portion (1212), wherein the inner end of the second connecting portion (1212) is connected to the outer end of the first connecting portion (1211), and the outer end of the second connecting portion (1212) is connected to the inner end of the second segment (122).

4. The impeller (10) according to claim 2, characterized in that: The rotating shaft (11) comprises: A first shaft body (111), wherein the first shaft body (111) is cylindrical, and the inner end of the first section body (121) is arranged on the outer periphery of the first shaft body (111) and extends along the axial direction of the first shaft body (111); The second shaft body (112) is cylindrical and is coaxially arranged and connected to the first shaft body (111); the radial dimension of the second shaft body (112) is greater than the radial dimension of the first shaft body (111).

5. The impeller (10) according to claim 4, characterized in that: The rotating shaft (11) further comprises: a third shaft (113), wherein the cross section of the third shaft (113) is circular and the longitudinal section is semicircular, the third shaft (113) is located between the first shaft (111) and the second shaft (112), the third shaft (113) is connected to the first shaft (111) and the second shaft (112) respectively, and the third shaft (113), the first shaft (111) and the second shaft (112) are coaxially arranged; The inner end of the first section (121) is simultaneously connected to the third shaft (113), the first shaft (111) and the second shaft (112).

6. The impeller (10) according to any one of claims 2 to 5, characterized in that: The number of the pump blades (12) is four, and the four pump blades (12) are divided into a first pump blade (123), a second pump blade (124), a third pump blade (125) and a fourth pump blade (126). The first pump blade (123) and the third pump blade (125) are centrally symmetrical with respect to the central axis of the rotating shaft (11), and the second pump blade (124) and the fourth pump blade (126) are centrally symmetrical with respect to the central axis of the rotating shaft (11).

7. The impeller (10) according to claim 6, characterized in that The inner end of the first pump blade (123) is connected to the rotating shaft (11) at a first position (A), the inner end of the second pump blade (124) is connected to the rotating shaft (11) at a second position (B), the inner end of the third pump blade (125) is connected to the rotating shaft (11) at a third position (C), and the inner end of the fourth pump blade (126) is connected to the rotating shaft (11) at a fourth position (D), wherein the first position (A) and the third position (C) are located at two ends of a first diameter of the rotating shaft (11), the second position (B) and the fourth position (D) are located at two ends of a second diameter of the rotating shaft (11), and the first diameter and the second diameter are perpendicular to each other.

8. The impeller (10) according to any one of claims 1 to 3, characterized in that: In the axial direction of the rotating shaft (11), the size of the pump blade (12) gradually decreases from the inner end of the pump blade (12) to the outer end of the pump blade (12).

9. The impeller (10) according to claim 8, characterized in that In the axial direction of the rotating shaft (11), the outer surface of the pump blade (12) comprises: The first side surface (127) and the second side surface are such that, in the axial direction of the rotating shaft (11), a height difference between two ends of the first side surface (127) is greater than a height difference between two ends of the second side surface.

10. A drainage pump (100), characterized in that: include: A housing (20), wherein the housing (20) has a receiving space; An impeller (10), at least a portion of the impeller (10) is located in the accommodating space, and the impeller (10) is an impeller (10) according to any one of claims 1 to 9.

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