Water pump for cleaning machine and cleaning machine

Abstract

The utility model relates to a water pump for a cleaning machine and the cleaning machine, the water pump comprises a pump shell and an impeller rotatably arranged in the pump shell, the impeller comprises an upper cover plate, a lower cover plate and water drawing blades arranged between the upper cover plate and the lower cover plate, and a plurality of salient points are at least arranged in a local area on the upper surface of the upper cover plate. According to the utility model, the plurality of salient points are arranged on the upper surface of the upper cover plate of the impeller, and the roughness of the upper cover plate is increased, so that the rotation angular velocity of fluid between the upper cover plate and the inner top wall of the pump shell is increased, the water pressure drop on the upper cover plate along the radial direction is increased, and the axial force on the upper cover plate is correspondingly reduced; therefore, the overall axial force of the impeller is reduced, the noise is reduced, and the water pumping efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dishwashers, in particular to a water pump for a washing machine and a washing machine. Background Art

[0002] Dishwashers have been widely used in home kitchens. Dishwashers are generally provided with a spray arm for spraying water, a concave water return area is provided at the bottom of the cabinet, the top of the water return area is covered with a filter plate, and a water pump is used to pump water from the water return area to the spray arm above the filter plate to realize the circulation spraying of washing water.

[0003] Using an open water pump to draw water for the spray arm can greatly shorten the return water path, improve the return water efficiency, and facilitate the maintenance of the water pump. The Chinese invention patent application with publication number CN115500758A, "A spatial guide vane and an open water pump, a cleaning machine" (application number: CN202211216030.7), discloses an open water pump structure, which includes a pump casing, a spatial guide vane and an impeller. Among them, the impeller is a centrifugal impeller, which rotates to pump the water in the return water area of ​​the cleaning machine into the water pump and further pump it into the spray arm to achieve spray cleaning.

[0004] Since the above-mentioned water pump is an open water pump and is directly installed in the return water area, in the cleaning state, the centrifugal impeller is located below the water level and will be affected by the buoyancy of the water. During the process of the impeller rotating and pumping water, the impeller may move up and down due to the different pressure differences, causing noise, and the contact between the impeller and the pump casing will also cause wear of the pump casing, affecting the pumping efficiency. Utility Model Content

[0005] The first technical problem to be solved by the utility model is to provide a water pump for a cleaning machine which can balance the axial force of the impeller to reduce noise and improve water pumping efficiency in view of the current status of the prior art.

[0006] The second technical problem to be solved by the utility model is to provide a cleaning machine using the water pump according to the current status of the prior art.

[0007] The technical solution adopted by the utility model to solve at least one of the above technical problems is:

[0008] A water pump for a cleaning machine comprises a pump casing and an impeller rotatably arranged in the pump casing, wherein the impeller comprises an upper cover plate, a lower cover plate and water-drawing blades arranged between the upper cover plate and the lower cover plate, and the upper surface of the upper cover plate is provided with a plurality of convex points at least in a local area.

[0009] The utility model provides a plurality of convex points on the upper surface of the impeller upper cover plate, and the provision of the convex points increases the roughness of the upper cover plate, thereby increasing the rotational angular velocity of the fluid between the upper cover plate and the top wall inside the pump casing, so that the water pressure drop along the radial direction above the upper cover plate increases, and the axial force received by the corresponding upper cover plate is reduced, thereby reducing the overall axial force of the impeller, which is beneficial to reducing noise and improving water pumping efficiency.

[0010] Preferably, the upper surface of the upper cover plate is provided with back blades extending from the central part to the edge, and the back blades are multiple and divide the upper surface of the upper cover plate into multiple fan-shaped areas, and the convex points are distributed in the fan-shaped areas. The back blades can affect the lateral pressure of the impeller, so that during the operation of the impeller, the pressure difference between the upper and lower parts of the impeller is greatly reduced, thereby reducing the axial force of the impeller, which can not only reduce noise, but also release the axial force of the motor, reduce the risk of wear with the volute, thereby making the space of the water pump more compact and improving the water pumping efficiency.

[0011] Preferably, in at least one of the fan-shaped regions, the diameter of the protrusions near the center of the impeller is smaller than the diameter of the protrusions near the edge of the impeller. Preferably, in at least one of the fan-shaped regions, the density of the protrusions near the center of the impeller is smaller than the density of the protrusions near the edge of the impeller. The above structure can reduce the impact on the flow direction of the fluid while balancing the axial force of the impeller, thereby maintaining a good water pumping effect.

[0012] Preferably, the number of the fan-shaped areas is an even number, and the convex points are distributed in the fan-shaped areas arranged at intervals. Further preferably, the number of the fan-shaped areas is 8, and the convex points are distributed in the 4 fan-shaped areas arranged at intervals. The above structure is conducive to improving the balancing force of the impeller on the water body in the circumferential direction, so as to further reduce noise and improve the water pumping effect.

[0013] Preferably, the main body of the back blade extends radially from the inside to the outside along the impeller, and the part of the back blade close to the edge of the impeller is bent from the inside to the outside along the rotation direction of the impeller. Preferably, the main body of the back blade and the bent part form a scooping structure at the junction, the scooping structure and its part radially outward of the impeller form a first area, and the part radially inward of the impeller forms a second area, and the density and / or diameter of the convex points in the first area are greater than the density and / or diameter of the convex points in the second area. The above structures are all conducive to improving the water-drawing effect and further improving the efficiency of the water pump.

[0014] Preferably, the water-drawing blade includes a first part extending from the central part of the impeller to the edge and a second part inclined from the outer end of the first part along the circumferential direction of the impeller, and the first part extends from the inner end to the outer end in a direction opposite to the water flow, so that the junction between the first part and the second part of the water-drawing blade forms a water scooping groove. The water scooping groove corresponds to the water scooping structure of the back blade, which is conducive to improving the water-drawing balance of the impeller in the circumferential direction and improving the efficiency of the water pump.

[0015] A cleaning machine comprises a box body, a concave water return area is arranged at the bottom of the box body, and also comprises the above-mentioned water pump, which is arranged in the water return area.

[0016] Compared with the prior art, the utility model has the following advantages: the utility model is provided with a number of convex points on the upper surface of the impeller upper cover plate, and the setting of the convex points increases the roughness of the upper cover plate, thereby increasing the rotational angular velocity of the fluid between the upper cover plate and the inner top wall of the pump casing, so that the water pressure drop along the radial direction above the upper cover plate increases, and the corresponding axial force on the upper cover plate is reduced, thereby reducing the overall axial force of the impeller, which is beneficial to reducing noise and improving water pumping efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the water pump according to an embodiment of the utility model;

[0018] Figure 2 for Figure 1 Schematic diagram of the bottom structure;

[0019] Figure 3 for Figure 1 A cross-sectional view of

[0020] Figure 4 This is a schematic diagram of the structure of the impeller in the embodiment of the utility model;

[0021] Figure 5 for Figure 4 Schematic diagram of the bottom structure. DETAILED DESCRIPTION

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0023] Embodiment 1:

[0024] like Figures 1 to 5 As shown, the water pump for a cleaning machine in this embodiment includes a pump casing 1 and an impeller 2 rotatably disposed in the pump casing 1. The pump casing 1 is disc-shaped, and a circular water inlet 11 is provided in the center of the bottom wall of the pump casing 1. The side wall of the pump casing 1 is formed with a water outlet 12 through a flow channel extending outward in a spiral. Two water outlets 12 are provided in this embodiment, and the two water outlets 12 are symmetrical relative to the center of the impeller 2. The impeller 2 is a centrifugal impeller rotatably disposed in the pump casing 1.

[0025] In this embodiment, the impeller 2 includes an upper cover plate 21 , a lower cover plate 22 and water-drawing blades 23 disposed between the upper cover plate 21 and the lower cover plate 22 . A plurality of protrusions 200 are disposed at least partially on the upper surface of the upper cover plate 21 .

[0026] The upper surface of the upper cover plate 21 is provided with a back blade 24 extending from the central part to the edge. There are multiple back blades 24 and the upper surface of the upper cover plate 21 is divided into multiple sector-shaped areas 210. The convex points 200 are distributed in the sector-shaped areas 210. The back blades 24 can affect the lateral pressure of the impeller 2, so that during the operation of the impeller 2, the pressure difference between the upper and lower parts of the impeller 2 is greatly reduced, thereby reducing the axial force of the impeller 2, which can not only reduce noise, but also release the axial force of the motor, reduce the risk of wear with the volute, thereby making the space of the water pump more compact and improving the water pumping efficiency.

[0027] In at least one sector-shaped area 210, the diameter of the protrusion 200 near the center of the impeller 2 is smaller than the diameter of the protrusion 200 near the edge of the impeller 2. In at least one sector-shaped area 210, the density of the protrusion 200 near the center of the impeller 2 is smaller than the density of the protrusion 200 near the edge of the impeller 2. With the above structure, the axial force of the impeller 2 can be balanced while reducing the impact on the flow direction of the fluid and maintaining a good water pumping effect.

[0028] The main body 241 of the back blade 24 of this embodiment extends from inside to outside along the radial direction of the impeller 2, and the part of the back blade 24 close to the edge of the impeller 2 is bent from inside to outside along the rotation direction of the impeller 2. The main body 241 of the back blade 24 and the bent part 242 form a scooping structure 240 at the connection point, and the scooping structure 240 and the part thereof extending radially outward from the impeller 2 form a first area 01, and the part of the scooping structure 240 extending radially inward from the impeller 2 forms a second area 02. The density and diameter of the convex points 200 in the first area 01 are greater than the density and diameter of the convex points 200 in the second area 02. The above structures are all conducive to improving the water-drawing effect and further improving the efficiency of the water pump.

[0029] The water-drawing blade 23 includes a first portion 231 extending from the central part to the edge of the impeller 2 and a second portion 232 inclined from the outer end of the first portion 231 along the circumferential direction of the impeller. The first portion 231 extends from the inner end to the outer end in a direction opposite to the water flow, so that the connection between the first portion 231 and the second portion 232 of the water-drawing blade 23 forms a water-scooping groove 233. The water-scooping groove 233 corresponds to the water-scooping structure 240 of the back blade 24, which is beneficial to improving the water-drawing balance of the impeller 2 in the circumferential direction and improving the efficiency of the water pump.

[0030] The cleaning machine of this embodiment includes a box body, a concave water return area is arranged at the bottom of the box body, and the water pump is arranged in the water return area. A motor can be arranged at the outer bottom of the box body, and the output shaft of the motor passes through the bottom wall of the box body upward and is connected to the impeller.

[0031] In this embodiment, a number of protrusions 200 are arranged on the upper surface of the upper cover plate 21 of the impeller 2. The arrangement of the protrusions 200 increases the roughness of the upper cover plate 21, thereby increasing the rotational angular velocity of the fluid between the upper cover plate 21 and the inner top wall of the pump casing 1, so that the water pressure drop along the radial direction on the upper cover plate 21 increases, and the axial force on the corresponding upper cover plate 21 is reduced, thereby reducing the overall axial force of the impeller 2, which is beneficial to reducing noise and improving water pumping efficiency.

[0032] Embodiment 2:

[0033] In this embodiment, the number of fan-shaped areas is an even number, and the convex points are distributed in the fan-shaped areas arranged at intervals. In this embodiment, there are 8 fan-shaped areas, and the convex points are distributed in the 4 fan-shaped areas arranged at intervals. The above structure is conducive to improving the balancing force of the impeller on the water body in the circumferential direction, so as to further reduce noise and improve the water pumping effect.

[0034] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A water pump for a cleaning machine, comprising a pump housing (1) and an impeller (2) rotatably arranged in the pump housing (1), wherein the impeller (2) comprises an upper cover plate (21), a lower cover plate (22) and a water-drawing blade (23) arranged between the upper cover plate (21) and the lower cover plate (22), characterized in that: The upper surface of the upper cover plate (21) is provided with a plurality of protrusions (200) at least in a local area.

2. The water pump for a cleaning machine according to claim 1, characterized in that: The upper surface of the upper cover plate (21) is provided with a back blade (24) extending from the central portion to the edge, and the back blades (24) are multiple and divide the upper surface of the upper cover plate (21) into multiple sector-shaped areas (210), and the protrusions (200) are distributed in the sector-shaped areas (210).

3. The water pump for a cleaning machine according to claim 2, characterized in that: In at least one of the fan-shaped regions (210), the diameter of the protrusion (200) close to the center of the impeller (2) is smaller than the diameter of the protrusion (200) close to the edge of the impeller (2).

4. The water pump for a cleaning machine according to claim 2, characterized in that: In at least one of the fan-shaped regions (210), the density of the protrusions (200) close to the center of the impeller (2) is smaller than the density of the protrusions (200) close to the edge of the impeller (2).

5. The water pump for a cleaning machine according to claim 2, characterized in that: The number of the fan-shaped regions (210) is even, and the protrusions (200) are distributed in the fan-shaped regions (210) arranged at intervals.

6. The water pump for a cleaning machine according to claim 5, characterized in that: There are eight fan-shaped areas (210), and the protrusions (200) are distributed in four fan-shaped areas (210) arranged at intervals.

7. The water pump for a cleaning machine according to any one of claims 2 to 6, characterized in that: The main body (241) of the back blade (24) extends from the inside to the outside along the radial direction of the impeller (2), and the part of the back blade (24) close to the edge of the impeller (2) is bent from the inside to the outside along the rotation direction of the impeller (2).

8. The water pump for a cleaning machine according to claim 7, characterized in that: The main part (241) and the bent part (242) of the back blade (24) form a scooping structure (240) at the connection point, the scooping structure (240) and its portion radially outward of the impeller (2) form a first area (01), and the portion radially inward of the impeller (2) forms a second area (02), and the density and / or diameter of the protrusions (200) in the first area (01) is greater than the density and / or diameter of the protrusions (200) in the second area (02).

9. The water pump for a cleaning machine according to claim 7, characterized in that: The water-drawing blade (23) comprises a first portion (231) extending from the central portion of the impeller (2) to the edge thereof, and a second portion (232) inclined from the outer end of the first portion (231) along the circumference of the impeller (2), wherein the first portion (231) extends obliquely from the inner end to the outer end in the opposite direction of the water flow, so that the junction between the first portion (231) and the second portion (232) of the water-drawing blade (23) forms a water scooping groove (233).

10. A cleaning machine, comprising a box, the bottom of which is provided with a concave water return area, characterized in that: It also includes a water pump as described in any one of claims 1 to 9, which is arranged in the return water area.

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