Open type water pump for cleaning machine and cleaning machine

Abstract

The open type water pump comprises a pump shell and an impeller, a water suction opening of the impeller corresponds to a water inlet in an up-down mode, a plurality of water guiding ribs spirally extending from the edge to the water inlet are arranged on the bottom wall of the pump shell, a spiral type flow guiding channel is formed between every two adjacent water guiding ribs, and the water guiding ribs are arranged in the spiral type flow guiding channel. The spiral trend of the flow guide channel is consistent with the rotating direction of the impeller. The water guide rib and the flow guide channel which spirally extend from the edge to the water inlet are arranged at the bottom of the pump shell, in the water drawing process, water flow at the bottom of the pump shell flows into the water inlet after being guided by the water guide rib and the flow guide channel, and when the water flow at the bottom of the pump shell flows along the flow guide channel from the far end to the near end of the center of the pump shell; the circumferential sectional area in the movement direction is gradually reduced, so that the flow velocity of each fluid is accelerated in order, the problem of collision disorder of the fluid in the process of being sucked into the pump shell is solved, vortex and blistering of a water inlet are avoided, and the water pumping performance is further improved.

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 water inlet at the bottom of the pump casing is below the water level. During the water absorption process, the water flow near the water inlet at the bottom of the pump casing is accelerated to enter the pump casing. The fluid near the water inlet is prone to turbulence and collision, which may cause eddy currents, bubbling and other problems, resulting in a decrease in pumping performance.

[0004] Therefore, further improvements are needed for the open water pump structure currently used in cleaning machines. 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 avoid eddy currents and bubbles at the water inlet and improve the water pumping performance 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 water inlet being provided on the bottom wall of the pump casing, the impeller being a centrifugal impeller, the water suction port of the impeller corresponding to the water inlet up and down, the bottom wall of the pump casing being provided with water guide ribs spirally extending from the edge to the water inlet, the water guide ribs being multiple and a spiral guide channel being formed between two adjacent water guide ribs, and the spiral trend of the guide channel being consistent with the rotation direction of the impeller.

[0009] The utility model provides water guide ribs spirally extending from the edge to the water inlet at the bottom of the pump casing, a spiral guide channel is formed between two adjacent water guide ribs, and the spiral trend of the guide channel is consistent with the rotation direction of the impeller. In the process of pumping water, the water flow at the bottom of the pump casing flows into the water inlet after being guided by the water guide ribs and the guide channel. When the water flow at the bottom of the pump casing flows along the guide channel from the far end to the near end of the center of the pump casing, the circumferential cross-sectional area in the moving direction gradually decreases, so that the flow rate of each fluid is accelerated in an orderly manner, and the collision disorder problem of the fluid in the process of being sucked into the pump casing is eliminated, thereby avoiding the generation of vortex and foaming at the water inlet, and further improving the water pumping performance.

[0010] Preferably, the impeller comprises an upper cover plate, a lower cover plate and water-drawing blades arranged at intervals from top to bottom, the water inlet is opened at the central part of the lower cover plate, the water-drawing blades are multiple and radially arranged between the upper cover plate and the lower cover plate, and the number of the guide channels is consistent with the number of the water-drawing blades. The number of the guide channels is consistent with the number of the water-drawing blades, so that the water flows from the guide channel at the bottom of the pump housing into the water flow acceleration grooves between the same number of blades in a more orderly state, and the flow state is more orderly.

[0011] Preferably, the diameter of the impeller water suction port is equal to the diameter of the pump housing water inlet and the two correspond to each other up and down, and two adjacent water-drawing blades enclose a water-drawing channel, and along the water flow direction, the end of the guide channel is arranged corresponding to the starting end of the water-drawing channel. With the above structure, the water body sucked into the water inlet along the guide channel can be thrown out along the circumferential direction through the impeller water-drawing channel, changing the direction of the fluid and reducing the hydraulic loss of the water pump.

[0012] Preferably, the lower surface of the upper cover plate is provided with a shaft extending downward and passing through the water suction port, the inner end of each of the water-drawing blades is connected to the outer peripheral surface of the shaft, and the connection between the upper end of the shaft and the lower surface of the upper cover plate forms a smoothly transitioned guide arc surface, which constrains the starting end of the water-drawing flow channel. The above structure is conducive to further reducing the hydraulic loss of the water pump during the process of changing the direction of the fluid.

[0013] 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 further reducing the turbulence of the water flow near the water inlet of the water pump, reducing the energy loss of the water flow, and improving the water suction effect.

[0014] Preferably, the bottom wall of the pump casing is partially concave to form a guide groove arranged around the water inlet, and at least part of the guide groove is gradually inclined upward from the edge to the water inlet, and the water guide ribs are arranged in the guide groove. The guide groove is formed into a conical table structure with a large lower end and a small upper end. The slope of the conical table of the guide groove relative to the horizontal plane is 3 to 6 degrees. With the above structure, after the fluid is accelerated along the spiral guide channel and enters the pump casing, an initial angular velocity of the water flow will be generated. The direction of this angular velocity is in the same direction as the rotation direction of the impeller and the flow output direction of the pump casing, which is beneficial to increase the initial energy of the water body entering the pump casing; at the same time, it reduces the angle of change in the flow direction of the water flow after entering the pump casing, which is beneficial to reduce the hydraulic loss of the water pump.

[0015] Preferably, when viewed from above, the guide groove is elliptical, the pump housing is disc-shaped, and two opposite side walls of the pump housing are respectively formed with water outlets extending spirally outward, and a tongue is formed between each water outlet and the corresponding pump housing side wall, and the two ends of the short axis of the guide groove elliptical structure correspond to a tongue arrangement respectively. The outer end of the guide rib corresponds to the edge arrangement of the guide groove, and the inner end of the guide rib corresponds to the edge arrangement of the water inlet. The above structure is adopted to maximize the rectification and diversion effects and reduce the hydraulic loss of the water pump.

[0016] 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 open water pump, which is arranged in the water return area.

[0017] Compared with the prior art, the utility model has the following advantages: the utility model is provided with a water guide rib which spirally extends from the edge to the water inlet at the bottom of the pump casing, a spiral guide channel is formed between two adjacent water guide ribs, and the spiral trend of the guide channel is consistent with the rotation direction of the impeller. During the water pumping process, the water at the bottom of the pump casing flows into the water inlet after being guided by the water guide rib and the guide channel. When the water at the bottom of the pump casing flows along the guide channel from the far end to the proximal end of the center of the pump casing, the circumferential cross-sectional area in the direction of movement gradually decreases, thereby accelerating the flow rate of each fluid in an orderly manner, eliminating the collision and disorder problem of the fluid in the process of being sucked into the pump casing, thereby avoiding the generation of vortex and foaming at the water inlet, and thus improving the water pumping performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the water pump according to an embodiment of the utility model;

[0019] Figure 2 for Figure 1 Schematic diagram of the bottom structure;

[0020] Figure 3 for Figure 1 Exploded diagram of

[0021] Figure 4 It is a cross-sectional view of an embodiment of the utility model. DETAILED DESCRIPTION

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

[0023] like Figures 1 to 4 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.

[0024] In this embodiment, the water suction port 221 of the impeller 2 corresponds to the water inlet 11 up and down, and the bottom wall of the pump casing 1 is provided with a water guide rib 13 spirally extending from the edge to the water inlet 11. There are multiple water guide ribs 13 and a spiral guide channel 14 is formed between two adjacent water guide ribs 13, and the spiral trend of the guide channel 14 is consistent with the rotation direction of the impeller 2.

[0025] The impeller 2 includes an upper cover plate 21, a lower cover plate 22 and water-drawing blades 23 arranged at intervals from top to bottom, a water inlet 221 is opened at the central part of the lower cover plate 22, a plurality of water-drawing blades 23 are radially arranged between the upper cover plate 21 and the lower cover plate 22, and the number of the guide channels 14 is consistent with the number of the water-drawing blades 23. The number of the guide channels 14 is consistent with the number of the water-drawing blades 23, so that the water flows from the guide channels 14 at the bottom of the pump housing 1 into the water flow acceleration grooves between the same number of blades in a more orderly state, and the flow state is more orderly.

[0026] The diameter of the water suction port 221 of the impeller 2 is equal to the diameter of the water inlet 11 of the pump housing 1 and the two correspond to each other up and down. Two adjacent water-drawing blades 23 enclose a water-drawing channel 24. Along the water flow direction, the end of the guide channel 14 is arranged corresponding to the starting end of the water-drawing channel 24. With the above structure, the water body sucked into the water inlet 11 along the guide channel 14 can be thrown out along the circumferential direction through the water-drawing channel 24 of the impeller 2, changing the direction of the fluid and reducing the hydraulic loss of the water pump.

[0027] The lower surface of the upper cover plate 21 is provided with a shaft 25 extending downward and passing through the water suction port 221, the inner end of each water-drawing blade 23 is connected with the outer peripheral surface of the shaft 25, and the connection between the upper end of the shaft 25 and the lower surface of the upper cover plate 21 forms a smoothly transitioned guide arc surface 251, and the guide arc surface 251 constrains the starting end of the water-drawing flow channel 24. The above structure is conducive to further reducing the hydraulic loss of the water pump during the process of changing the direction of the fluid.

[0028] The lower part and the lower end of the shaft 25 are formed into a bowl-shaped guide surface 252, the lower part of the shaft 25 is arranged through the water inlet 11 of the pump housing 1, and the middle part of the guide surface 252 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 25, which is conducive to further reducing the turbulence of the water flow near the water inlet 11 of the water pump, reducing the energy loss of the water flow, and improving the water suction effect.

[0029] The bottom wall of the pump housing 1 is partially concave to form a guide groove 15 surrounding the water inlet 11. At least part of the guide groove 15 is gradually inclined upward from the edge to the water inlet 11, and the water guide rib 13 is arranged in the guide groove 15. The guide groove 15 is formed into a conical table structure with a large lower end and a small upper end. The slope a formed by the conical table of the guide groove 15 relative to the horizontal plane is 3 to 6 degrees. With the above structure, after the fluid is accelerated along the spiral guide channel 14 and enters the pump housing 1, an initial angular velocity of the water flow will be generated. The direction of this angular velocity is in the same direction as the rotation direction of the impeller 2 and the flow output direction of the pump housing 1, which is conducive to increasing the initial energy of the water body entering the pump housing 1; at the same time, it reduces the angle of change in the flow direction of the water flow after entering the pump housing 1, which is conducive to reducing the hydraulic loss of the water pump.

[0030] From the upward angle, the guide groove 15 is elliptical, the pump housing 1 is disc-shaped, and the two opposite side walls of the pump housing 1 are respectively formed with water outlets 12 extending outward in a spiral, and a tongue is formed between each water outlet 12 and the corresponding side wall of the pump housing 1. The two ends of the short axis of the elliptical structure of the guide groove 15 correspond to a tongue arrangement. The outer end of the guide rib 13 corresponds to the edge of the guide groove 15, and the inner end of the guide rib 13 corresponds to the edge of the water inlet 11. The above structure is adopted to maximize the rectification and diversion effect and reduce the hydraulic loss of the water pump.

[0031] 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 of the impeller 2.

[0032] In this embodiment, a water guide rib 13 spirally extending from the edge to the water inlet 11 is provided at the bottom of the pump casing 1, and a spiral guide channel 14 is formed between two adjacent water guide ribs 13, and the spiral trend of the guide channel 14 is consistent with the rotation direction of the impeller 2. During the water pumping process, the water at the bottom of the pump casing 1 is guided by the water guide rib 13 and the guide channel 14 and flows into the water inlet 11. When the water at the bottom of the pump casing 1 flows from the far end to the proximal end of the center of the pump casing 1 along the guide channel 14, the circumferential cross-sectional area in the direction of movement gradually decreases, thereby accelerating the flow rate of each fluid in an orderly manner, eliminating the collision and disorder problem of the fluid in the process of being sucked into the pump casing, thereby avoiding vortex and bubbling at the water inlet, and thus improving the water pumping performance.

[0033] 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 water inlet (11) is provided on the bottom wall of the pump casing (1); the impeller (2) is a centrifugal impeller (2); the water suction port (221) of the impeller (2) corresponds to the water inlet (11) in upper and lower positions; the bottom wall of the pump casing (1) is provided with a water guide rib (13) extending spirally from the edge to the water inlet (11); the water guide rib (13) is multiple and a spiral guide channel (14) is formed between two adjacent water guide ribs (13); and the spiral trend of the guide channel (14) is consistent with the rotation direction of the impeller (2).

2. The open water pump for a cleaning machine according to claim 1, characterized in that: The impeller (2) comprises an upper cover plate (21), a lower cover plate (22) and water-drawing blades (23) which are arranged at intervals from top to bottom. The water suction port (221) is opened at the central part of the lower cover plate (22). The water-drawing blades (23) are multiple and are arranged radially between the upper cover plate (21) and the lower cover plate (22). The number of the guide channels (14) is the same as the number of the water-drawing blades (23).

3. The open water pump for a cleaning machine according to claim 2, characterized in that: The diameter of the water suction port (221) of the impeller (2) is equal to the diameter of the water inlet (11) of the pump housing (1), and the two correspond to each other in the upper and lower parts. Two adjacent water-drawing blades (23) enclose a water-drawing channel (24). Along the direction of water flow, the end of the guide channel (14) is arranged corresponding to the starting end of the water-drawing channel (24).

4. The open water pump for a cleaning machine according to claim 3, characterized in that: The lower surface of the upper cover plate (21) is provided with a shaft (25) extending downward and passing through the water suction port (221); the inner end of each of the water-drawing blades (23) is connected to the outer peripheral surface of the shaft (25); the connection between the upper end of the shaft (25) and the lower surface of the upper cover plate (21) forms a smoothly transitioned guide arc surface (251); the guide arc surface (251) constrains the starting end of the water-drawing channel (24).

5. The open water pump for a cleaning machine according to claim 4, characterized in that: The lower part and the lower end of the shaft (25) are formed into a bowl-shaped flow guide surface (252); the lower part of the shaft (25) is arranged through the water inlet (11) of the pump housing (1), and the middle part of the flow guide surface (252) is arranged corresponding to the inner wall of the water inlet (11).

6. The open water pump for a cleaning machine according to any one of claims 1 to 5, characterized in that: The bottom wall of the pump housing (1) is partially concave to form a guide groove (15) arranged around the water inlet (11); at least a portion of the guide groove (15) is arranged to gradually tilt upward from the edge to the water inlet (11); and the water guide rib (13) is arranged in the guide groove (15).

7. The open water pump for a cleaning machine according to claim 6, characterized in that: The guide groove (15) is formed into a conical table structure with a larger lower end and a smaller upper end.

8. The open water pump for a cleaning machine according to claim 7, characterized in that: The slope (a) formed by the conical table surface of the guide groove (15) relative to the horizontal plane is 3 to 6 degrees.

9. The open water pump for a cleaning machine according to claim 6, characterized in that: When viewed from an upward angle, the guide groove (15) is elliptical, the pump housing (1) is disc-shaped, and two opposite side walls of the pump housing (1) are respectively formed with water outlets (12) extending spirally outwards, and a partition tongue is formed between each water outlet (12) and the corresponding side wall of the pump housing (1), and two ends of the short axis (25) of the elliptical structure of the guide groove (15) correspond to a partition tongue arrangement.

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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