Water pump for cleaning machine and cleaning machine

Abstract

The utility model relates to a water pump for cleaning machine and cleaning machine, including pump casing and can rotatingly set up the impeller in the pump casing, the lateral part of pump casing is provided with the water outlet flow channel of spiral extension along the circumference, the throat part of water outlet flow channel and pump casing joint forms the baffle tongue, the distance between impeller outer edge and baffle tongue is 5-7.5 mm. The water pump is provided with the water outlet flow channel spirally extending in the circumferential direction, the partition tongue is formed at the throat position where the water outlet flow channel is connected with the pump shell, and the distance between the outer edge of the impeller and the partition tongue is 5-7.5 mm. By restraining the distance, on the basis that the water drawing flow of the water pump is met, volute noise can be effectively reduced, and therefore the efficiency of the water pump is improved, and the service life of the water pump is prolonged. And the user experience is greatly 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. "An open water pump and cleaning machine" (application number: CN202211216848.9) with publication number CN115573915A discloses a structure in which a concave return water area is provided at the bottom of the box body, and the top of the return water area is covered with a filter plate. The open water pump is arranged in the return water area, and there is a water suction gap between the water suction port at the bottom of the pump housing and the bottom of the return water area. The first water outlet at the top of the pump housing is located above the filter plate and is connected to the water inlet of the first spray arm. The second spray arm is arranged in the upper middle part of the box body and is connected to the second water outlet of the pump housing through a water supply pipe.

[0004] The above-mentioned water pump is an open centrifugal pump structure. Since the water pump is directly placed in the return water area to draw water, the return water path is very short. After the water flows into the pump casing, it is quickly distributed through the flow channel and then output. When a larger water flow rate is met, the throat of the pump casing is very likely to generate snail noise due to the excessive local flow velocity, which not only affects the efficiency and life of the water pump, but also seriously affects the user experience. 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 reduce the volute noise and improve the efficiency and life of the water pump on the basis of meeting the water suction flow rate 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. A water outlet channel extending in a circumferential spiral is arranged on the side of the pump casing. A baffle is formed at the throat where the water outlet channel is connected to the pump casing. The spacing between the outer edge of the impeller and the baffle is 5 to 7.5 mm.

[0009] Preferably, the water inlet is opened on the bottom wall of the pump housing, and the end of the water outlet channel forms a water outlet offset relative to the center of the pump housing. The spirally extending water outlet channel offsets the water outlet relative to the center of the water pump, thereby facilitating the central arrangement of the water outlet and the spray arm connected to the water outlet when the water pump is not centered relative to the washing chamber.

[0010] Preferably, the pump housing includes a disc-shaped body, and the water inlet is opened at the central part of the bottom wall of the body. Preferably, the impeller is a disc-shaped centrifugal impeller, and the centrifugal impeller is arranged concentrically with the water inlet. The above structure is conducive to improving the water pumping effect.

[0011] Preferably, the impeller comprises an upper cover plate and a lower cover plate which are arranged at intervals from top to bottom, and a plurality of blades which are arranged at intervals between the upper cover plate and the lower cover plate, and the blades extend in the radial direction of the impeller. Preferably, a water-drawing channel is formed between two adjacent blades, a water-drawing inlet corresponding to the arrangement of the water inlet is opened in the central part of the lower cover plate, and a water-drawing outlet is formed at the end of the corresponding water-drawing channel on the side of the impeller.

[0012] Preferably, the distance between the outer edge of the impeller and the partition tongue is 6.5-7.5 mm.

[0013] If the clearance between the outer edge of the impeller and the tongue is too large, it will cause a small water flow and low head; if the clearance between the outer edge of the impeller and the tongue is too small, it will not only reduce the efficiency of the pump, but also cause cavitation in the small gap due to the high water pressure in the pump casing, resulting in a large local flow rate and noise. The utility model optimizes the spacing between the outer edge of the impeller and the tongue to be 6.5 to 7.5 mm, which can not only meet the requirements of a water pump flow of 40 L / min and a head of 2 meters, but also effectively reduce the sluice noise and improve the user experience.

[0014] A cleaning machine comprises a water cup, wherein the water cup is provided with a concave water return area, the top of which is covered with a filter plate, and also comprises the above-mentioned water pump, which is arranged in the water return area and is used to pump water in the water return area onto the filter plate.

[0015] Preferably, a slag collection basket and a heating element are also provided in the water return area. From a top view, the water pump, slag collection basket and heating element are arranged in a herringbone structure, and the side walls of the water return area are surrounded by the periphery of the herringbone structure to form a triangular structure, wherein the water pump is provided with an offset water outlet and the outlet extends to the central part of the herringbone structure. The water return area is arranged in the center of the bottom of the washing chamber of the cleaning machine, the water pump is offset relative to the center of the bottom wall of the washing chamber, and the water outlet of the water pump is arranged corresponding to the central part of the bottom of the washing chamber. 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.

[0016] The water return area is arranged in the center of the bottom of the inner tank (i.e. the bottom of the washing chamber), the water pump is offset relative to the center of the bottom wall of the inner tank, and the water outlet of the water pump is arranged corresponding to the central part of the bottom of the inner tank. The "water return area is arranged in the center of the bottom of the inner tank" mentioned above means that the center of the water return area roughly overlaps with the center of the bottom wall of the inner tank. Of course, they may not be completely aligned. For example, it can be: a circular area with a diameter of 5 to 10 mm and the center of the water return area falls within the circular area with the center of the bottom wall of the inner tank as the center of the circle; "the water pump is offset relative to the center of the bottom wall of the inner tank" means that the center of the water pump falls outside the above-mentioned circular area.

[0017] Compared with the prior art, the advantages of the utility model are: the water pump of the utility model has an outlet flow channel extending along the circumferential spiral, and a partition tongue is formed at the throat where the outlet flow channel is connected to the pump casing. The distance between the outer edge of the impeller and the partition tongue is 5 to 7.5 mm. By constraining the distance, the volcanic noise can be effectively reduced on the basis of meeting the water flow rate of the water pump, thereby improving the efficiency and life of the water pump and greatly improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 for Figure 1 A top view of the hidden filter plate;

[0020] Figure 3 This is a schematic diagram of the structure of the water pump according to an embodiment of the utility model;

[0021] Figure 4 for Figure 3 Schematic diagram of the bottom structure;

[0022] Figure 5 It is an assembly diagram of the impeller and the pump casing in the embodiment of the utility model;

[0023] Figure 6 It is a schematic diagram of the structure of the impeller in the embodiment of the utility model. DETAILED DESCRIPTION

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

[0025] The water pump used for the cleaning machine in this embodiment is an open water pump, that is, the water pump is installed in the return water area of ​​the cleaning machine, and no external pipeline is required to guide water. The water in the return water area directly flows back through the water pump and the spray arm.

[0026] like Figures 1 to 6As shown, the water pump 3 of this embodiment includes a pump housing 36 and an impeller 37 rotatably arranged in the pump housing 36. The pump housing 36 is provided with a water outlet channel 34 extending in a circumferential spiral on the side. The throat where the water outlet channel 34 is connected to the pump housing 36 forms a tongue 341. The distance d between the outer edge of the impeller 37 and the tongue 341 is 5 to 7.5 mm, preferably 6.5 to 7.5 mm. If the matching clearance between the outer edge of the impeller 37 and the tongue 341 is too large, it will cause a small water flow rate and low head; if the matching clearance between the outer edge of the impeller 37 and the tongue 341 is too small, it will not only reduce the efficiency of the pump, but also, due to the high water pressure in the pump housing 36, cavitation will occur in the small gap, resulting in a large local flow rate and noise. In this embodiment, the distance between the outer edge of the impeller 37 and the partition tongue 341 is preferably 6.5-7.5 mm, which can not only meet the requirements of a water pump flow rate of 40 L / min and a head of 2 meters, but also effectively reduce the cochlear noise and improve the user experience.

[0027] The pump housing 36 of this embodiment includes a disc-shaped body, and the water inlet 33 is opened in the central part of the bottom wall of the body. The end of the water outlet channel 34 is connected to a water guide pipe 32 extending upward, and the upper end of the water guide pipe 32 forms a water outlet 31 offset relative to the center of the pump housing 36. The water outlet 31 can be connected to a spray arm to spray from bottom to top at the bottom of the washing chamber. The spirally extended water outlet channel 34 offsets the water outlet 31 relative to the center of the water pump 3, so as to facilitate the central arrangement of the water outlet and the spray arm connected to the water outlet when the water pump 3 is not centered relative to the washing chamber.

[0028] The impeller 37 of this embodiment is a disc-shaped centrifugal impeller, which is arranged concentrically with the water inlet 33 .

[0029] The impeller 37 includes an upper cover plate 371 and a lower cover plate 372 which are arranged at intervals from top to bottom, and a plurality of blades 373 which are arranged at intervals between the upper cover plate 371 and the lower cover plate 372. The blades 373 extend along the radial direction of the impeller 37. A water-drawing channel 374 is formed between two adjacent blades 373. A water-drawing inlet 375 corresponding to the arrangement of the water inlet 33 is formed in the central part of the lower cover plate 372. A water-drawing outlet is formed at the side of the impeller 37 at the end of the corresponding water-drawing channel 374.

[0030] The cleaning machine of this embodiment includes a water cup 2 and the water pump 3. The water cup 2 is provided with a concave water return area 21. The top of the water return area 21 is covered with a filter plate 22. The water pump 3 is provided in the water return area 21 and is used to pump the water in the water return area 21 to the spray arm above the filter plate 22. A slag collection basket 4 and a heating element 5 are also provided in the water return area 21. From a top view, the water pump 3, the slag collection basket 4 and the heating element 5 are arranged in a herringbone structure. The side wall of the water return area 21 is surrounded by the periphery of the herringbone structure to form a triangular structure, wherein the water outlet 31 of the water pump 3 extends to the central part of the herringbone structure through the water outlet channel 34. The water return area 21 is arranged in the center of the bottom of the washing chamber of the cleaning machine. The water pump 3 is offset relative to the center of the bottom wall of the washing chamber. The water outlet 31 of the water pump 3 is arranged corresponding to the central part of the bottom of the washing chamber.

[0031] The water pump 3 of this embodiment has a water outlet channel 34 extending along a circumferential spiral. A baffle 341 is formed at the throat where the water outlet channel 34 is connected to the pump casing 36. The distance d between the outer edge of the impeller 37 and the baffle 341 is 5 to 7.5 mm. By constraining this distance, the sluice noise can be effectively reduced on the basis of satisfying the water suction flow rate of the water pump 3, thereby improving the efficiency and life of the water pump and greatly improving the user experience.

[0032] 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 (36) and an impeller (37) rotatably disposed in the pump housing (36), characterized in that: The pump housing (36) is provided with a water outlet channel (34) extending in a circumferential spiral on the side thereof, a baffle (341) is formed at the throat where the water outlet channel (34) is connected to the pump housing (36), and a distance (d) between the outer edge of the impeller (37) and the baffle (341) is 5 to 7.5 mm.

2. The water pump for a cleaning machine according to claim 1, characterized in that: The bottom wall of the pump housing (36) is provided with a water inlet (33), and the end of the water outlet channel (34) forms a water outlet (31) offset relative to the center of the pump housing (36).

3. The water pump for a cleaning machine according to claim 2, characterized in that: The pump housing (36) comprises a disc-shaped body, and the water inlet (33) is opened at the central part of the bottom wall of the body.

4. The water pump for a cleaning machine according to claim 3, characterized in that: The impeller (37) is a disc-shaped centrifugal impeller (37), and the centrifugal impeller (37) is arranged concentrically with the water inlet (33).

5. The water pump for a cleaning machine according to claim 4, characterized in that: The impeller (37) comprises an upper cover plate (371) and a lower cover plate (372) which are arranged in an upper and lower manner, and a plurality of blades (373) which are arranged in an upper and lower manner, and are arranged in an upper and lower manner. The blades (373) extend in the radial direction of the impeller (37).

6. The water pump for a cleaning machine according to claim 5, characterized in that: A water-drawing channel (374) is formed between two adjacent blades (373); a water-drawing inlet (375) corresponding to the arrangement of the water inlet (33) is opened in the central portion of the lower cover plate (372); and a water-drawing outlet is formed on the side of the impeller (37) at the end of the corresponding water-drawing channel (374).

7. The water pump for a cleaning machine according to any one of claims 1 to 6, characterized in that: The distance (d) between the outer edge of the impeller (37) and the partition tongue (341) is 6.5 to 7.5 mm.

8. A cleaning machine, comprising a water cup (2), wherein the water cup (2) is provided with a concave water return area (21), the top of the water return area (21) is covered with a filter plate (22), characterized in that: It also comprises a water pump (3) according to any one of claims 1 to 7, wherein the water pump (3) is arranged in the return water area (21) and is used to pump water in the return water area onto the filter plate (22).

9. The cleaning machine according to claim 8, characterized in that: A slag collecting basket (4) and a heating element (5) are also provided in the water return area (21). When viewed from a top view, the water pump (3), the slag collecting basket (4) and the heating element (5) are arranged in a herringbone structure. The side walls of the water return area (21) are enclosed at the periphery of the herringbone structure to form a triangular structure. The water pump (3) is provided with an offset water outlet (31) and the water outlet extends to the central portion of the herringbone structure.

10. The cleaning machine according to claim 9, characterized in that: The water return area (21) is arranged centrally at the bottom of the washing chamber of the cleaning machine, the water pump (3) is offset relative to the center of the bottom wall of the washing chamber, and the water outlet (31) of the water pump (3) is arranged corresponding to the central part of the bottom of the washing chamber.

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