Impeller for cleaning machine, water pump and cleaning machine

Abstract

The utility model relates to an impeller for a cleaning machine, a water pump and the cleaning machine, the impeller for the cleaning machine comprises an upper cover plate, a lower cover plate and water drawing blades, the upper cover plate and the lower cover plate are vertically arranged at intervals, the water drawing blades are located between the upper cover plate and the lower cover plate, and back blades extending from the center to the edge are arranged on the upper surface of the upper cover plate. According to the embodiment, the back blades are arranged on the upper cover plate of the impeller and can influence the lateral pressure of the impeller, so that in the operation process of the impeller, the pressure difference between the upper portion and the lower portion of the impeller is greatly reduced, the axial force of the impeller is reduced, noise can be lowered, the axial movement force of a motor can be released, and the risk of abrasion with a volute is reduced; gaps between the impeller and the inner top wall and the inner bottom wall of the pump shell are more controllable, and the limit value of the gaps between the impeller and the inner top wall and the inner bottom wall of the pump shell can be set to be about 2.5 mm, so that the space of the water pump is more compact, and the water pumping efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dishwashers, in particular to an impeller, a water pump 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. 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 below the water level and will be affected by the buoyancy of the water. During the process of the impeller rotating to draw water, the impeller may move up and down due to the different pressure differences, which will not only generate noise, but also the contact between the impeller and the pump casing will cause wear of the pump casing, affecting the pumping efficiency. Utility Model Content

[0004] The first technical problem to be solved by the utility model is to provide an impeller for a cleaning machine which can reduce noise and wear on the pump casing and thus improve the water pumping efficiency in view of the current status of the prior art.

[0005] The second technical problem to be solved by the utility model is to provide a water pump using the above impeller 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] An impeller for a cleaning machine comprises an upper cover plate and a lower cover plate which are spaced apart from each other, and a water-drawing blade located between the upper cover plate and the lower cover plate. The upper surface of the upper cover plate is provided with a back blade extending from the central part to the edge, and at least part of the back blade extends from the inside to the outside along the radial direction of the impeller.

[0009] Preferably, the main body of the back blade extends from inside to outside along the radial direction of the impeller, and the part of the back blade close to the edge of the impeller is bent from inside to outside along the rotation direction of the impeller. This structure can form a water scooping structure at the top of the impeller, and as the impeller rotates, the water between the top of the impeller and the top wall of the water pump participates in the circulation.

[0010] Preferably, the bent portion of the back blade forms a first bent section, and the portion of the water-drawing blade close to the edge of the impeller is bent from the inside to the outside along the rotation direction of the impeller to form a second bent section, and the bending directions of the first bent section and the second bent section are consistent. The two bent sections have the same direction, forming a scooping structure with the same direction, which is conducive to improving the water-drawing capacity, avoiding water flow turbulence, and reducing noise.

[0011] Preferably, the length of the second bending section is greater than or equal to the length of the first bending section. In the utility model, the core function of the back blade is to balance the axial force of the impeller and reduce noise, and the water flow at the top of the impeller is extremely small, so the above structure strengthens the scooping and water drawing effect of the water-drawing blade.

[0012] Preferably, the back blades and the water-drawing blades are staggered in the vertical direction. The back blades are arranged in the area between two adjacent water-drawing blades. With such a structure, the axial force of the impeller can be balanced to the maximum extent without greatly affecting the efficiency of the pump. After the axial force is balanced, the wear on the pump casing can be reduced, so that the lower string of blades will not be worn to the lower volute in a long-term use environment.

[0013] Preferably, the height of the water-drawing blade in the vertical direction is 6 to 8 mm. The height of the back blade in the vertical direction is 0.8 to 3 mm, and more preferably 0.8 to 1.5 mm.

[0014] Preferably, the water-drawing blade and / or back blade comprises a first part extending from the central part of the impeller to the edge and a second part inclined along the circumference of the impeller from the outer end of the first part. This structure is conducive to improving the water-drawing effect.

[0015] Preferably, the first portion and the second portion are both straight line segments, and the acute angle a formed by the bending of the second portion relative to the first portion is 20 to 40 degrees, more preferably 25 to 35 degrees.

[0016] Preferably, the ratio of the length L2 of the second part to the length L1 of the first part is 0.2-0.6. The acute angle a formed by the bending of the second part relative to the first part is 30 degrees, and the ratio of the length L2 of the second part to the length L1 of the first part is 1:3 or 1:4. When a is 30 degrees and L2 / L1=1:3, the water pumping efficiency can be significantly improved; when a is 30 degrees and L2 / L1=1:4, the noise can be significantly reduced and the effect of the axial force can be reduced.

[0017] Preferably, a water inlet is provided in the central portion of the lower cover plate corresponding to the first portion of the water-drawing blade, and the second portion of the water-drawing blade extends obliquely in the direction of the water flow relative to the first portion. Preferably, the first portion of the water-drawing blade extends obliquely from the inner end to the outer end against the direction of the water flow, so that the junction between the first portion and the second portion of the water-drawing blade forms a water scooping structure. Preferably, the first portion of the water-drawing blade is inclined at an angle of 25 to 35 degrees against the direction of rotation of the impeller. The above structures are all conducive to improving the water-drawing effect of the blades and improving the efficiency of the water pump.

[0018] Preferably, the water-drawing blades are an even number and are evenly distributed along the circumference of the centrifugal impeller. The even number of water-drawing blades can cooperate with the inner wall of the pump casing in the pump casing to balance the water-drawing force in the circumferential direction, thereby improving the running stability of the water pump.

[0019] A water pump comprises a pump casing, wherein the bottom of the pump casing is provided with a water inlet, the top of the pump casing is provided with a water outlet, and the impeller is rotatably arranged in the pump casing.

[0020] 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.

[0021] Preferably, a slag collecting basket and a heating element are also provided in the return water area. From a top view, the water pump, slag collecting basket and heating element are arranged in a herringbone structure. The side walls of the return water area are enclosed in the periphery of the herringbone structure, wherein the water outlet of the water pump is an offset water outlet and extends to the central part of the herringbone structure. The return water area is a triangular structure with smooth corner transitions, including a first straight side, a second straight side and a third straight side connected end to end, and each straight side is smoothly connected at the intersection by an arc segment. The return water area is arranged in the center of the bottom of the box, the water pump is offset relative to the center of the bottom wall of the box, and the water outlet of the water pump is arranged corresponding to the central part of the bottom of the box. The return water area of ​​the existing washing machine is semicircular in shape as a whole. Considering that the spray arm needs to be arranged in the center relative to the box body in order to better cover the tableware cleaning range, the return water area needs to be offset on the bottom wall of the box body, and the debris collecting basket located next to the spray arm is also offset on the bottom wall of the box body. During the return water process, the ideal effect is that the return water enters the return water area after filtering the residue through the debris collecting basket, and then is further drawn into the spray arm through the water suction port of the open water pump in the return water area. However, since the debris collecting basket is offset too far from the bottom wall of the box body, the return water enters the return water area before flowing to the debris collecting basket, resulting in poor debris collection effect and residue retention problems on the filter plate. At the same time, the structure of the return water area of ​​the existing cleaning machine determines that the heating element located beside the water pump is also offset on the bottom wall of the box. In order to improve the heating efficiency, it is necessary to make the heating element have a corresponding return water area. This requires the return water area to have a volume that meets the installation requirements of the heating element and the slag collection basket, which makes it difficult to reduce the total volume of the return water chamber, resulting in a certain amount of water waste, affecting the water efficiency of the cleaning machine. The utility model sets the return water area as a triangular structure, and uses each corner area of ​​the triangular structure to install the water pump, the slag collection basket, and the heating element, and then guides the outlet water to the remaining space in the central part of the triangular structure through the offset outlet of the water pump, so as to maximize the use of the space of the return water area, which not only greatly reduces the volume of the return water area, which is beneficial to saving the amount of washing water each time, but also helps to improve the return water speed and water efficiency; because the water pump no longer occupies the central part of the bottom of the cleaning machine, the slag collection basket can be closer to the central part of the bottom of the cleaning machine, which is beneficial to improve the slag collection effect.

[0022] Compared with the prior art, the advantages of the utility model are: the utility model is provided with a back blade on the impeller cover plate, the back blade 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 on the volute, and make the gap between the impeller and the top wall and the inner bottom wall of the pump casing more controllable, so that the gap between the impeller and the top wall and the inner bottom wall of the pump casing can be set to a limit value of about 2.5mm, thereby making the space of the water pump more compact and improving the water pumping efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the impeller in the embodiment of the utility model;

[0024] Figure 2 for Figure 1 Schematic diagram of the bottom structure;

[0025] Figure 3 for Figure 1 sectional view of

[0026] Figure 4 This is a schematic diagram of the structure of a water pump in an embodiment of the utility model;

[0027] Figure 5 for Figure 4 Schematic diagram of the bottom structure;

[0028] Figure 6 It is a schematic diagram of the structure of a cleaning machine according to an embodiment of the utility model. DETAILED DESCRIPTION

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0030] like Figures 1 to 6 As shown, the impeller 4 used in the cleaning machine in this embodiment is a centrifugal impeller, which is mainly used in an open water pump.

[0031] The impeller 4 of this embodiment includes an upper cover plate 41 and a lower cover plate 42 which are spaced apart from each other, and a water-drawing blade 43 located between the upper cover plate 41 and the lower cover plate 42 . The upper surface of the upper cover plate 41 is provided with a back blade 44 extending from the center to the edge.

[0032] The back blades 44 and the water-drawing blades 43 are arranged staggered in the vertical direction. The back blades 44 are arranged in the area between two adjacent water-drawing blades 43. With such a structure, the axial force of the impeller can be balanced to the maximum extent without greatly affecting the efficiency of the pump. After the axial force is balanced, the wear on the pump housing 31 can be reduced, so that the lower string of blades will not be worn to the lower pump housing in a long-term use environment.

[0033] The height h1 of the water-drawing blade 43 in the vertical direction is 6 to 8 mm. The height h2 of the back blade 44 in the vertical direction is 0.8 to 3 mm, and more preferably 0.8 to 1.5 mm.

[0034] In this embodiment, at least part of the back blade 44 extends from inside to outside along the radial direction of the impeller 4. Here, "from inside to outside" means from the position close to the center of the impeller to the edge of the impeller. Specifically, the main part of the back blade 44 extends from inside to outside along the radial direction of the impeller, and the part of the back blade 44 close to the edge of the impeller is bent from inside to outside along the rotation direction of the impeller 4. This structure can form a water scooping structure at the top of the impeller 4, and as the impeller rotates, the water between the top of the impeller and the top wall of the water pump participates in the circulation.

[0035] The bent portion of the back blade 44 forms a first bent section, and the portion of the water-drawing blade 43 close to the edge of the impeller 4 is bent from the inside to the outside along the rotation direction of the impeller 4 to form a second bent section, and the bending direction of the first bent section is consistent with that of the second bent section. The two bent sections are in the same direction, forming a scooping structure with a consistent direction, which is beneficial to improving the water-drawing capacity, avoiding water flow turbulence, and reducing noise. The length of the second bent section is greater than or equal to the length of the first bent section. In this embodiment, the core function of the back blade 44 is to balance the axial force of the impeller 4 and reduce noise, and the water flow at the top of the impeller 4 is extremely small. Therefore, the above structure is used to enhance the scooping and water-drawing effect of the water-drawing blade.

[0036] The water-drawing blade 43 and the back blade 44 include a first portion 401 extending from the central portion of the impeller to the edge and a second portion 402 inclined along the circumference of the impeller from the outer end of the first portion 401. This structure is conducive to improving the water-drawing effect. In this embodiment, the second portion of the back blade 44 constitutes a first bending section, and the second portion of the water-drawing blade 43 constitutes a second bending section.

[0037] The first portion 401 and the second portion 402 are both straight segments, and the acute angle a formed by the second portion 402 bending relative to the first portion 401 is 20 to 40 degrees, and more preferably 25 to 35 degrees.

[0038] The ratio of the length L2 of the second part 402 to the length L1 of the first part 401 is 0.2 to 0.6. The acute angle a formed by the second part 402 relative to the first part 401 is 30 degrees, and the ratio of the length L2 of the second part 402 to the length L1 of the first part 401 is 1:3 or 1:4. When a is selected to be 30 degrees and L2 / L1=1:3, the water pumping efficiency can be significantly improved; when a is selected to be 30 degrees and L2 / L1=1:4, the noise can be significantly reduced and the effect of the axial force can be reduced.

[0039] The central part of the lower cover plate 42 is provided with a water inlet 45 arranged corresponding to the first part 401 of the water-drawing blade 43, and the second part 402 of the water-drawing blade 43 extends obliquely in the direction of the water flow relative to the first part 401. The first part 401 of the water-drawing blade 43 extends obliquely from the inner end to the outer end against the direction of the water flow, so that the connection between the first part 401 and the second part 402 of the water-drawing blade 43 forms a scooping structure 403. The first part 401 of the water-drawing blade 43 is inclined against the rotation direction of the impeller at an angle b of 25 to 35 degrees. The above structures are all conducive to improving the water-drawing effect of the blades and improving the efficiency of the water pump.

[0040] The water-drawing blades 43 are an even number and are evenly distributed along the circumference of the centrifugal impeller. The even number of water-drawing blades 43 can cooperate with the inner wall of the pump housing 31 in the pump housing 31 to balance the water-drawing force in the circumferential direction, thereby improving the running stability of the water pump.

[0041] The water pump 3 of this embodiment includes a pump housing 31 , which has a water inlet 311 at the bottom and a water outlet 312 at the top, and also includes the impeller 4 rotatably disposed in the pump housing 31 .

[0042] The cleaning machine of this embodiment comprises a housing 1 , a concave water return area 11 is arranged at the bottom of the housing 1 , and the water pump 3 is arranged in the water return area 11 .

[0043] The return water area 11 is also provided with a slag collection basket 411 and a heating element 5. From a top view, the water pump 3, the slag collection basket 411 and the heating element 5 are arranged in a herringbone structure. The side walls of the return water area 11 are enclosed in the periphery of the herringbone structure, wherein the water outlet 312 of the water pump is an offset water outlet 312 and extends to the central part of the herringbone structure. The return water area 11 is a triangular structure with a smooth corner transition, including a first straight edge, a second straight edge and a third straight edge connected end to end, and each straight edge is smoothly connected at the intersection by an arc segment. The return water area 11 is arranged in the center of the bottom of the box body 1, and the water pump is offset relative to the center of the bottom wall of the box body 1. The water outlet 312 of the water pump is arranged corresponding to the central part of the bottom of the box body 1. The return water area 11 of the existing washing machine is semicircular in shape as a whole. Considering that the spray arm needs to be arranged in the center relative to the box body 1 in order to better cover the tableware cleaning range, the return water area 11 needs to be offset on the bottom wall of the box body 1, and the residue collecting basket 411 located next to the spray arm is also offset on the bottom wall of the box body 1. During the return water process, the ideal effect is that the return water enters the return water area 11 after filtering the residue through the residue collecting basket 411, and then is further drawn into the spray arm through the water suction port of the open water pump located in the return water area 11. However, since the residue collecting basket 411 is offset too far from the bottom wall of the box body 1, the return water enters the return water area 11 before flowing to the residue collecting basket 411, resulting in poor residue collection effect and residue retention problems on the filter plate. At the same time, the structure of the return water area 11 of the existing cleaning machine determines that the heating element 5 located beside the water pump is also offset on the bottom wall of the box body 1. In order to improve the heating efficiency, it is necessary to make the heating element 5 have a corresponding return water area, which requires the return water area 11 to have a volume that meets the installation requirements of the heating element 5 and the slag collection basket 411, resulting in the difficulty in reducing the total volume of the return water chamber, causing a certain amount of water waste, and affecting the water efficiency of the cleaning machine. The utility model sets the return water area 11 as a triangular structure, and uses each corner area of ​​the triangular structure to install the water pump, the slag collection basket 411, and the heating element 5, and then guides the outlet water to the remaining space in the central part of the triangular structure through the offset outlet 312 of the water pump, so as to maximize the use of the space of the return water area 11, which not only greatly reduces the volume of the return water area 11, but also helps to save the amount of washing water each time, and helps to improve the return water speed and water efficiency; because the water pump no longer occupies the central part of the bottom of the cleaning machine, the slag collection basket 411 can be closer to the central part of the bottom of the cleaning machine, which is conducive to improving the slag collection effect.

[0044] In this embodiment, a back blade 44 is provided on the upper cover plate 41 of the impeller 4. The back blade 44 can affect the lateral pressure of the impeller, so that during the operation of the impeller 4, the pressure difference between the upper and lower sides of the impeller 4 is greatly reduced, thereby reducing the axial force of the impeller 4, which can not only reduce noise, but also release the axial force of the motor, reduce the risk of wear with the pump casing 31, and make the gap between the impeller 4 and the inner top wall and the inner bottom wall of the pump casing 31 more controllable, so that the gap between the impeller 4 and the inner top wall and the inner bottom wall of the pump casing 31 can be set to a limit value of about 2.5 mm, thereby making the space of the water pump more compact and improving the water pumping efficiency.

[0045] 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. An impeller for a cleaning machine, comprising an upper cover plate (41), a lower cover plate (42) arranged in an upper and lower interval, and a water-drawing blade (43) located between the upper cover plate (41) and the lower cover plate (42), characterized in that: The upper surface of the upper cover plate (41) is provided with a back blade (44) extending from the central portion to the edge, and at least a portion of the back blade extends from the inside to the outside along the radial direction of the impeller.

2. The impeller for a cleaning machine according to claim 1, characterized in that: The main body of the back blade extends from inside to outside along the radial direction of the impeller, and the portion of the back blade close to the edge of the impeller is bent from inside to outside along the rotation direction of the impeller.

3. The impeller for a cleaning machine according to claim 2, characterized in that: The bent portion of the back blade forms a first bent section, and the portion of the water-drawing blade close to the edge of the impeller is bent from inside to outside along the impeller rotation direction to form a second bent section, and the bending directions of the first bent section and the second bent section are consistent.

4. The impeller for a cleaning machine according to claim 3, characterized in that: The length of the second bending section is greater than or equal to the length of the first bending section.

5. The impeller for a cleaning machine according to any one of claims 1 to 4, characterized in that: The back blade (44) and the water-drawing blade (43) are arranged staggered in the up-down direction.

6. The impeller for a cleaning machine according to claim 5, characterized in that: The back blade (44) is arranged corresponding to the area between two adjacent water-drawing blades (43).

7. The impeller for a cleaning machine according to any one of claims 1 to 4, characterized in that: The height of the water-drawing blade (43) in the vertical direction is 6 to 8 mm.

8. The impeller for a cleaning machine according to any one of claims 1 to 4, characterized in that: The height of the back blade (44) in the vertical direction is 0.8 to 3 mm.

9. The impeller for a cleaning machine according to claim 8, characterized in that: The height of the back blade (44) in the vertical direction is 0.8 to 1.5 mm.

10. The impeller for a cleaning machine according to any one of claims 1 to 4, characterized in that: The water-drawing blade (43) and / or the back blade (44) comprises a first part (401) extending from the central part to the edge of the impeller and a second part (402) inclined along the circumference of the impeller from the outer end of the first part (401).

11. The impeller for a cleaning machine according to claim 10, characterized in that: The first part (401) and the second part (402) are both straight line segments, and the acute angle formed by the bending of the second part (402) relative to the first part (401) is 20 to 40 degrees.

12. The impeller for a cleaning machine according to claim 11, characterized in that: The acute angle formed by the bending of the second portion (402) relative to the first portion (401) is 25 to 35 degrees.

13. The impeller for a cleaning machine according to claim 10, characterized in that: The ratio of the length L2 of the second portion (402) to the length L1 of the first portion (401) is 0.2 to 0.

6.

14. The impeller for a cleaning machine according to claim 10, characterized in that: The acute angle formed by the bending of the second part (402) relative to the first part (401) is 30 degrees, and the ratio of the length L2 of the second part (402) to the length L1 of the first part (401) is 1:3 or 1:

4.

15. The impeller for a cleaning machine according to claim 10, characterized in that: The lower cover plate (42) has a water inlet (45) at the central portion thereof arranged corresponding to the first portion (401) of the water-drawing blade (43), and the second portion (402) of the water-drawing blade (43) extends obliquely toward the direction of water flow relative to the first portion (401).

16. The impeller for a cleaning machine according to claim 10, characterized in that: The first part (401) of the water-drawing blade (43) extends obliquely from the inner end to the outer end in the opposite direction of the water flow, so that the connection between the first part (401) and the second part (402) of the water-drawing blade (43) forms a water scooping structure (403).

17. The impeller for a cleaning machine according to claim 10, characterized in that: The first part (401) of the water-drawing blade (43) is inclined at an angle of 25 to 35 degrees in the direction opposite to the rotation direction of the impeller.

18. The impeller for a cleaning machine according to any one of claims 1 to 4, characterized in that: The water-drawing blades (43) are in an even number and are evenly distributed along the circumference of the impeller.

19. A water pump, comprising a pump housing (31), wherein the pump housing (31) has a water inlet (311) at the bottom and a water outlet (312) at the top, characterized in that: It also comprises an impeller according to any one of claims 1 to 18, wherein the impeller is rotatably disposed in the pump casing (31).

20. A cleaning machine, comprising a housing (1), wherein a concave water return area (11) is provided at the bottom of the housing (1), characterized in that: It also comprises the water pump according to claim 19, which is arranged in the return water area (11).

21. The cleaning machine according to claim 20, characterized in that: A slag collecting basket (411) and a heating element (5) are also provided in the water return area (11); when viewed from a top view, the water pump, the slag collecting basket (411) and the heating element (5) are arranged in a herringbone structure; the side wall of the water return area (11) is enclosed within the periphery of the herringbone structure; the water outlet (312) of the water pump is an offset water outlet (312) and extends to the central portion of the herringbone structure.

22. The cleaning machine according to claim 21, characterized in that: The water return area (11) is a triangular structure with a smooth transition at the corner, comprising a first straight side, a second straight side, and a third straight side connected end to end, and each straight side is smoothly connected through an arc segment at the intersection.

23. The cleaning machine according to claim 22, characterized in that: The water return area (11) is arranged in the center of the bottom of the box body (1), the water pump is offset relative to the center of the bottom wall of the box body (1), and the water outlet (312) of the water pump is arranged corresponding to the central part of the bottom of the box body (1).

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