Open type water pump for cleaning machine and cleaning machine

Abstract

The utility model relates to an open type water pump for a cleaning machine and the cleaning machine, the water pump comprises a pump shell and an impeller, the upper surface of the impeller is provided with a back blade extending from the central part to the edge, at least the part of the back blade close to the edge of the impeller gradually extends downwards and inclines along the radial direction from inside to outside to form a slope, and correspondingly, the back blade is provided with an opening. The top wall of the pump shell gradually arches upwards inwards from the position corresponding to the outer edge of the impeller to form a matching cavity matched with the slope. The back blade is arranged on the back portion of the impeller, the outer end portion of the back blade is arranged to be of the slope structure, the top wall of the pump shell is arranged to be of the corresponding inverted conical table structure, in the operation process of the impeller, the back blade greatly reduces the pressure difference between the upper portion and the lower portion of the impeller, and therefore axial force of the impeller is reduced, and noise is reduced. The slope of the back blade and the corresponding pump shell matching cavity structure not only are beneficial for further reducing noise, but also can consider the vertical height of the water pump, so that the better water pumping efficiency of the water pump is maintained.

Description

Technical Field

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

[0004] In order to solve the above problems, there are also back blades on the top of the impeller in the prior art. The back blades can reduce the axial force of the impeller to avoid movement and reduce noise. However, if the height of the back blade is small, the effect is not good. If the height of the back blade is large, the vertical height of the water pump needs to be increased, resulting in a large size of the water pump, which not only requires a larger installation space in the return water area, but also affects the overall pumping efficiency of the water pump to a certain extent. Utility Model Content

[0005] The first technical problem to be solved by the utility model is to provide an open water pump for a cleaning machine which can effectively reduce noise and maintain good 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 above-mentioned open water pump in view of 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 open water pump for a cleaning machine comprises a pump casing and an impeller rotatably arranged in the pump casing, the pump casing being provided with a water inlet and a water outlet, the upper surface of the impeller being provided with a back blade extending from a central portion to an edge, the back blade at least close to the edge of the impeller gradually extending downward from the inside to the outside in a radial direction and tilting to form a slope, and correspondingly, the top wall of the pump casing gradually arches upward inward from the corresponding outer edge of the impeller to form a matching cavity matching the slope.

[0009] The utility model arranges a back blade on the back of the impeller, and arranges the outer end part of the back blade into a slope structure, and arranges the top wall of the pump casing into a corresponding inverted conical platform structure. During the operation of the impeller, the back blade greatly reduces the pressure difference between the upper and lower parts of the impeller, thereby reducing the axial force of the impeller and reducing noise. The slope of the back blade and the corresponding matching cavity structure of the pump casing are not only conducive to further reducing noise, but also can take into account the vertical height of the water pump, thereby maintaining a good water pumping efficiency of the water pump.

[0010] Preferably, the matching cavity is in the shape of an inverted cone, the top of the matching cavity is a plane corresponding to the axis of the impeller center, and the length of the inner inclined surface of the matching cavity is greater than the length of the back blade. The above structure is conducive to reducing the force between the top of the impeller and the inner top wall of the pump casing, and by releasing the axial force of the motor, reducing the risk of wear with the volute, the gap between the impeller and the inner top wall and inner bottom wall of the pump casing is more controllable, thereby making the space of the water pump more compact and improving the water pumping efficiency.

[0011] Preferably, the slope of the slope is a, the slope of the inner wall of the matching cavity is b, and b<a. More preferably, a=9-11°, b=6-8°. The above parameters can maintain good water pumping efficiency while taking into account the pump efficiency and reducing noise.

[0012] Preferably, the impeller comprises an upper cover plate and a lower cover plate arranged at intervals from top to bottom, and a water-drawing blade located between the upper cover plate and the lower cover plate, the back blade is located on the upper surface of the upper cover plate, a water suction port is provided at the central portion of the lower cover plate, a shaft extending downward and passing through the water suction port is provided on the lower surface of the upper cover plate, and the inner end of the back blade is arranged corresponding to the periphery of the shaft. The above structure is conducive to improving the water absorption effect.

[0013] Preferably, the water-drawing blade comprises a first part and a second part connected in sequence along the radial direction of the impeller, and the first part extends obliquely from the inner end to the outer end in the direction opposite to the rotation direction of the impeller, so that the connection between the first part and the second part of the water-drawing blade forms a water scooping structure. The above structures are conducive to improving the water-drawing effect of the blade and improving the efficiency of the water pump.

[0014] Preferably, the back blades and the water-drawing blades are staggered in the vertical direction, and the inner end of the first part of the water-drawing blade is arranged close to the inner end of the corresponding back blade, and the first part of the water-drawing blade and the back blade form an angle of 25 to 40 degrees. This structure can better take into account the water-drawing effect and the balancing effect on the axial force of the impeller.

[0015] Preferably, the lower part and the lower end of the shaft are formed into a bowl-shaped flow guide surface, the lower part of the shaft is arranged through the water inlet of the pump housing, and the middle part of the flow guide surface is arranged corresponding to the inner wall of the water inlet. With such a structure, the impeller forms a downward-probing water suction structure through the lower end of its shaft, which is conducive to reducing the turbulence of the water flow near the water suction port of the water pump, reducing the energy loss of the water flow, and improving the water suction effect.

[0016] Preferably, the radial length of the back blade is L, and the radial length corresponding to the slope portion of the back blade is L1, where L1 = (0.5-0.8) L. The above parameters are used to further take into account the water pumping effect and the balancing effect on the impeller axial force.

[0017] A cleaning machine comprises a box body, a concave water return area is arranged at the bottom of the box body, and a water pump is arranged in the water return area.

[0018] Compared with the prior art, the advantages of the present invention are as follows: the present invention arranges a back blade on the back of the impeller, and arranges the outer end portion of the back blade into a slope structure, and arranges the top wall of the pump casing into a corresponding inverted conical structure. During the operation of the impeller, the back blade greatly reduces the pressure difference between the upper and lower parts of the impeller, thereby reducing the axial force of the impeller and reducing noise; the slope of the back blade and the corresponding pump casing matching cavity structure are not only conducive to further reducing noise, but also can take into account the vertical height of the water pump, thereby maintaining a good water pumping efficiency of the water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the water pump according to an embodiment of the utility model;

[0020] Figure 2 for Figure 1 Schematic diagram of the bottom structure;

[0021] Figure 3 for Figure 1 A cross-sectional view of

[0022] Figure 4 This is a schematic diagram of the structure of the impeller in the embodiment of the utility model;

[0023] Figure 5 for Figure 4 Top view of the . DETAILED DESCRIPTION

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] like Figures 1 to 5 As shown, the open water pump for a cleaning machine in this embodiment includes a pump housing 1 and an impeller 2. The pump housing 1 is disc-shaped, and the interior of the pump housing 1 is hollow to form a pump chamber 10. The impeller 2 is rotatably disposed in the pump chamber 10 of the pump housing 1. A water inlet 11 is provided at the bottom of the pump housing 1, and a water outlet 12 is provided at the side for outputting water flow through a spirally extending flow channel. The impeller 2 is a centrifugal impeller.

[0026] In this embodiment, the upper surface of the impeller 2 is provided with a back blade 21 extending from the central part to the edge, and at least the portion of the back blade 21 close to the edge of the impeller 2 gradually extends downward from the inside to the outside along the radial direction and tilts to form a slope 211. Correspondingly, the top wall of the pump casing 1 gradually arches upward inward from the corresponding outer edge of the impeller 2 to form a matching cavity 101 that matches the back blade 21 with the slope 211.

[0027] The mating cavity 101 is in the shape of an inverted cone, the top of the mating cavity 101 is a plane 102 corresponding to the axis 204 at the center of the impeller 2, and the length of the inner inclined surface 103 of the mating cavity 101 is greater than the length of the back blade 21. The above structure is conducive to reducing the force between the top of the impeller 2 and the inner top wall of the pump housing 1, and by releasing the axial force of the motor, reducing the risk of wear with the volute, the gap between the impeller and the inner top wall and inner bottom wall of the pump housing is more controllable, so that the space of the water pump is more compact and the pumping efficiency is improved.

[0028] The slope of the slope 211 is a, and the slope of the inner wall of the matching cavity 101 is b, where b<a. In this embodiment, a=9-11°, b=6-8°. The above parameters can maintain a good pumping efficiency while taking into account the pump efficiency and reducing noise.

[0029] The impeller 2 includes an upper cover plate 201 and a lower cover plate 202 arranged at intervals from top to bottom, and a water-drawing blade 203 located between the upper cover plate 201 and the lower cover plate 202. The back blade 21 is located on the upper surface of the upper cover plate 201. A water suction port 205 is provided at the central portion of the lower cover plate 202. A shaft 204 extending downward and passing through the water suction port 205 is provided on the lower surface of the upper cover plate 201. The inner end of the back blade 21 is arranged corresponding to the periphery of the shaft 204. The above structure is conducive to improving the water absorption effect.

[0030] The water-drawing blade 203 includes a first portion 2031 and a second portion 2032 which are connected in sequence along the radial direction of the impeller 2. The first portion 2031 extends obliquely from the inner end to the outer end in the direction opposite to the rotation direction of the impeller 2, so that the connection between the first portion 2031 and the second portion 2032 of the water-drawing blade 203 forms a scooping structure 2033. The above structures are conducive to improving the water-drawing effect of the blade and improving the efficiency of the water pump.

[0031] The back blade 21 and the water-drawing blade 203 are staggered in the vertical direction, and the inner end of the first part 2031 of the water-drawing blade 203 is arranged close to the inner end of the corresponding back blade 21, and the first part 2031 of the water-drawing blade 203 forms an angle c of 25 to 40 degrees with the back blade 21. This structure can better take into account the water-drawing effect and the balancing effect on the axial force of the impeller.

[0032] The lower part and the lower end of the shaft 204 are formed into a bowl-shaped guide surface 2041, the lower part of the shaft 204 is arranged through the water inlet 11 of the pump housing 1, and the middle part of the guide surface 2041 is arranged corresponding to the inner wall of the water inlet 11. With such a structure, the impeller 2 forms a downward-probing water suction structure through the lower end of its shaft 204, which is conducive to reducing the turbulence of the water flow near the water suction port of the water pump, reducing the energy loss of the water flow, and improving the water suction effect.

[0033] The radial length of the back blade 21 is L, and the radial length corresponding to the slope 211 of the back blade 21 is L1, where L1 = (0.5-0.8) L. The above parameters are used to further take into account the water pumping effect and the balancing effect on the impeller axial force.

[0034] 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 is arranged at the bottom of the box body, and the output shaft of the motor extends upward and passes through the bottom wall of the box body to be connected with the shaft 204 of the impeller 2.

[0035] In this embodiment, a back blade 21 is arranged on the back of the impeller 2, and the outer end portion of the back blade 21 is arranged to be a slope 211 structure, and the top wall of the pump casing 1 is arranged to be a corresponding inverted conical structure. During the operation of the impeller 2, the back blade 21 greatly reduces the pressure difference between the upper and lower parts of the impeller 2, thereby reducing the thrust of the impeller shaft 204 and reducing noise. The slope 211 of the back blade 21 and the corresponding pump casing 1 matching cavity 101 structure are not only conducive to further reducing noise, but also can take into account the vertical height of the water pump, thereby maintaining a good water pumping efficiency of the water pump.

[0036] 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 open water pump for a cleaning machine, comprising a pump housing (1) and an impeller (2) rotatably arranged in the pump housing (1), wherein the pump housing (1) is provided with a water inlet (11) and a water outlet (12), characterized in that: The upper surface of the impeller (2) is provided with a back blade (21) extending from the central part to the edge, and at least the portion of the back blade (21) close to the edge of the impeller (2) gradually extends downward from the inside to the outside in a radial direction and tilts to form a slope (211). Correspondingly, the top wall of the pump casing (1) gradually arches upward inward from the outer edge of the corresponding impeller (2) to form a matching cavity (101) matching with the back blade (21) having the slope (211).

2. The open water pump for a cleaning machine according to claim 1, characterized in that: The matching cavity (101) is in the shape of an inverted conical table, the top of the matching cavity (101) is a plane (102) corresponding to the axis (204) at the center of the impeller (2), and the length of the inner inclined surface (103) of the matching cavity (101) is greater than the length of the back blade (21).

3. The open water pump for a cleaning machine according to claim 2, characterized in that: The slope of the slope (211) is a, and the slope of the inner wall of the matching cavity (101) is b, where b<a.

4. The open water pump for a cleaning machine according to claim 3, characterized in that: a=9~11°, b=6~8°.

5. The open water pump for a cleaning machine according to claim 2, characterized in that: The impeller (2) comprises an upper cover plate (201) and a lower cover plate (202) which are arranged in an upper and lower manner with a spacing therebetween, and a water-drawing blade (203) located between the upper cover plate (201) and the lower cover plate (202); the back blade (21) is located on the upper surface of the upper cover plate (201); a water suction port (205) is provided at the central portion of the lower cover plate (202); a shaft (204) extending downward and passing through the water suction port (205) is provided on the lower surface of the upper cover plate (201); and the inner end of the back blade (21) is arranged corresponding to the periphery of the shaft (204).

6. The open water pump for a cleaning machine according to claim 5, characterized in that: The water-drawing blade (203) comprises a first part (2031) and a second part (2032) which are connected in sequence along the radial direction of the impeller (2); the first part (2031) extends obliquely from the inner end to the outer end in the direction opposite to the rotation direction of the impeller (2), so that the connection between the first part (2031) and the second part (2032) of the water-drawing blade (203) forms a water scooping structure (2033).

7. The open water pump for a cleaning machine according to claim 6, characterized in that: The back blade (21) and the water-drawing blade (203) are staggered in the vertical direction, and the inner end of the first part (2031) of the water-drawing blade (203) is arranged close to the inner end of the corresponding back blade (21), and the first part (2031) of the water-drawing blade (203) and the back blade (21) form an angle (c) of 25 to 40 degrees.

8. The open water pump for a cleaning machine according to claim 5, characterized in that: The lower part and the lower end of the shaft (204) are formed into a bowl-shaped flow guide surface (2041); the lower part of the shaft (204) passes through the water inlet (11) at the bottom of the pump housing (1), and the middle part of the flow guide surface (2041) corresponds to the inner wall of the water inlet (11).

9. The open water pump for a cleaning machine according to any one of claims 1 to 8, characterized in that: The radial length of the back blade (21) is L, and the radial length corresponding to the slope (211) portion of the back blade (21) is L1, where L1=(0.5-0.8)L.

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 the water pump according to any one of claims 1 to 9, which is arranged in the return water area.

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