Water pump for cleaning machine and cleaning machine

Abstract

The water pump comprises a volute and an impeller which is rotatably arranged in the volute, the volute is in a disc shape, a water inlet is formed in the bottom of the volute, water outlets which spirally extend outwards are formed in the side portion of the volute, the number of the water outlets is two, and a partition tongue is formed between each water outlet and the volute. The two side walls of the volute correspondingly form a volute line for pressurizing the outlet water of the corresponding water outlet, the volute line comprises a first volute line section and a second volute line section which extend from the baffle tongue in the water flow direction and are in smooth transition connection, and the second volute line section tends to expand outwards relative to the first volute line section in the water outlet direction. By means of the structure, water output from all the water outlets can be guided more smoothly, impact force on the baffle tongue is reduced, vibration and noise at the baffle tongue are further reduced, and the water pumping effect is improved.

Description

Technical Field

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

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

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

[0004] Since the water pump is an open type water pump, it is directly installed in the return water area. In the cleaning state, the water inlet at the bottom of the water pump is below the water level. During the pumping process, as the washing environment changes, the impeller speed may change at the same power. The volute of the existing centrifugal water pump volute is generally determined by a single spiral equation. For an open type water pump, the volute determined by a single spiral equation cannot well adapt to the requirement that the impeller changes speed with the washing environment, which easily leads to vibration at the diaphragm, resulting in increased noise and poor water pumping effect. 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 that can better guide the water flow, thereby reducing the vibration and noise at the baffle and improving the water pumping effect, in view of the current status of the existing technology.

[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 volute and an impeller rotatably arranged in the volute, the volute is disc-shaped and has a water inlet at the bottom and a water outlet extending spirally outward at the side, there are two water outlets and a tongue is formed between each water outlet and the volute, and the two side walls of the volute form corresponding volute lines for pressurizing water outlets of the corresponding water outlets, the volute line comprises a first volute line segment and a second volute line segment extending from the tongue along the direction of water flow and smoothly transitioning to each other, and the second volute line segment tends to expand outwardly relative to the first volute line segment along the water outlet direction.

[0009] The utility model firstly diverts the outlet water in the circumferential direction of the volute through two centrally symmetrical water outlets. During the circulation transportation process of the water body in the pump, a part of the water is diverted along the spiral trend of the water flow each time it passes through a water outlet. The diverted water flow offsets a part of the pressure at the corresponding baffle tongue in the pump and balances the pressure on both sides of the baffle tongue, which is beneficial to reducing the vibration at the baffle tongue and achieving the effect of shock absorption and noise reduction. At the same time, the pressurized surface of the volute adopts two smoothly connected first volute line segments and second volute line segments, which is beneficial to more smoothly guide the output water bodies of each water outlet, reduce the impact force on the baffle tongue, further reduce the vibration and noise at the baffle tongue, and improve the water pumping effect.

[0010] In the present invention, the center of the volute is taken as the origin O, the starting point of the first volute line segment corresponding to the tongue is A, the straight line passing through OA is the X-axis, the straight line passing through O and perpendicular to OA is the Y-axis, the spiral angle of point i on the first volute line segment is θ, and the distance from the point to O is RiO, the spiral angle of point i on the second volute line segment is θ, and the distance from the point to O is RiO', then

[0011] RiO=K 11 θπ / 180+K 12

[0012] RiO'=K 21 θπ / 180+K 22

[0013] Among them, K 11 >K 21 , K 22 >K 12 .

[0014] More preferably, RiO=4.43θπ / 180+31.9, RiO'=3θπ / 180+35.27.

[0015] The above structure is helpful to reduce the vibration caused by the water flow and water pressure impact at the baffle, thereby reducing noise and improving the water pumping effect.

[0016] Preferably, the water outlet forms a direct current section at least at its inlet, and the outer wall of the direct current section is tangentially connected to the end of the second spiral segment. This structure is conducive to further guiding the output water body and avoiding vibration problems caused by the large internal and external pressure difference.

[0017] Preferably, the partition tongue is formed between the inner wall of the direct current section and the volute, and the outer wall of the partition tongue is arranged obliquely to form a guide surface, which gradually expands the width of the direct current section entrance against the direction of the water flow. The end of the second volute line segment is arranged corresponding to the guide surface. The above structure is conducive to further balancing the pressure inside and outside the partition tongue, so that the water flow is output more smoothly during the output process at the water outlet.

[0018] Preferably, the impeller comprises an upper cover plate, a lower cover plate and a water-drawing blade located between the upper cover plate and the lower cover plate, and a water suction port corresponding to the water inlet is provided in the central part of the lower cover plate. The above structure is adopted to cooperate with the volute structure to output water stably and improve the water pumping effect.

[0019] 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.

[0020] Compared with the prior art, the advantages of the utility model are: the utility model first diverts the outlet water in the circumferential direction of the volute through two centrally symmetrical water outlets. During the circulation transportation of the water in the pump, a part of the water is diverted along the spiral trend of the water flow each time it passes through a water outlet. The diverted water flow offsets a part of the pressure at the corresponding baffle tongue in the pump and balances the pressure on both sides of the baffle tongue, which is beneficial to reducing the vibration at the baffle tongue and achieving the effect of shock absorption and noise reduction. At the same time, the pressure surface of the volute adopts two smoothly connected first volute line segments and second volute line segments, which is beneficial to more smoothly guide the output water of each water outlet, reduce the impact force on the baffle tongue, further reduce the vibration and noise at the baffle tongue, and improve the water pumping effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the water pump according to an embodiment of the utility model;

[0022] Figure 2 for Figure 1 Schematic diagram of the bottom structure;

[0023] Figure 3 for Figure 1 A cross-sectional view of

[0024] Figure 4 It is the volute line diagram corresponding to the volute of the embodiment of the utility model. DETAILED DESCRIPTION

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] like Figures 1 to 4 As shown, the water pump for a cleaning machine in this embodiment includes a volute 1 and an impeller 2 rotatably disposed in the volute 1. The volute 1 is disc-shaped, and a circular water inlet 11 is provided in the center of the bottom wall of the volute 1. A water outlet 12 is formed on the side wall of the volute 1 through a flow channel extending outward in a spiral. The impeller 2 is a centrifugal impeller rotatably disposed in the volute 1.

[0027] There are two water outlets 12 in the present embodiment, and a partition tongue 10 is formed between each water outlet 12 and the volute 1. The two side walls of the volute 1 correspond to form a volute line 100 for pressurizing the water outlet of the corresponding water outlet 12. The volute line 100 includes a first volute line segment 101 and a second volute line segment 102 which extend from the partition tongue 10 along the direction of water flow and transition smoothly. The second volute line segment 102 tends to expand outward relative to the first volute line segment 101 along the water outlet direction.

[0028] Specifically, the center of the volute 1 is taken as the origin O, the starting point of the first volute segment 101 corresponding to the tongue 10 is A, the straight line passing through OA is the X-axis, the straight line passing through O and perpendicular to OA is the Y-axis, the spiral angle of point i on the first volute segment 101 is θ, and the distance from the point to O is RiO, the spiral angle of point i on the second volute segment 102 is θ, and the distance from the point to O is RiO', then

[0029] RiO=K 11 θπ / 180+K 12

[0030] RiO'=K 21 θπ / 180+K 22

[0031] Among them, K 11 >K 21 , K 22 >K 12 .

[0032] In this embodiment, RiO=4.43θπ / 180+31.9, RiO'=3θπ / 180+35.27. In the positive semi-axis region corresponding to the X-axis, the first spiral line corresponds to the region of θ=0-135 degrees, the second spiral line corresponds to the region of θ=135-180 degrees, and θ is obtained by rotating the positive semi-axis of the X-axis counterclockwise; in the negative semi-axis region corresponding to the X-axis, the first spiral line corresponds to the region of θ=0-135 degrees, the second spiral line corresponds to the region of θ=135-180 degrees, and θ is obtained by rotating the negative semi-axis of the X-axis counterclockwise.

[0033] For example, when θ=135, the first spiral line is connected to the second spiral line, RiO=RiO'=42.34; when θ=60, the corresponding point i is located on the first spiral line, RiO=36.54; when θ=150, the corresponding point i is located on the second spiral line, RiO'=43.12.

[0034] The above structure is helpful to reduce the vibration caused by the water flow and water pressure impact at the baffle, thereby reducing noise and improving the water pumping effect.

[0035] The water outlet 12 forms a direct current section 121 at least at its inlet, and the outer wall of the direct current section 121 is tangentially connected to the end of the second spiral line section 102. This structure is conducive to further guiding the output water body and avoiding vibration problems caused by the large internal and external pressure difference.

[0036] The partition tongue 10 is formed between the inner wall of the direct current section 121 and the volute 1, and the outer wall of the partition tongue 10 is arranged obliquely to form a guide surface 01, which gradually expands the width of the direct current section 12 at the entrance against the direction of the water flow. The end of the second volute line section 102 is arranged corresponding to the guide surface 01. The above structure is conducive to further balancing the pressure inside and outside the partition tongue 10, so that the water flow is output more smoothly during the output process at the water outlet 12.

[0037] The impeller 2 of this embodiment includes an upper cover plate 21, a lower cover plate 22 and a water-drawing blade 23 located between the upper cover plate 21 and the lower cover plate 22. A water suction port 221 corresponding to the water inlet 11 is provided in the central portion of the lower cover plate 22. The above structure is adopted to cooperate with the volute structure to output water stably and improve the water pumping effect.

[0038] The cleaning machine of this embodiment includes a box body, a concave water return area is arranged at the bottom of the box body, and the water pump is arranged in the water return area. A motor can be arranged at the outer bottom of the box body, and the output shaft of the motor passes through the bottom wall of the box body upward and is connected to the impeller.

[0039] In this embodiment, the outlet water is first diverted in the circumferential direction of the volute 1 through two centrally symmetrical water outlets 12. During the circulation transportation process of the water in the pump, a part of the water is diverted along the spiral trend of the water flow each time it passes through a water outlet 12. The diverted water flow offsets a part of the pressure at the corresponding baffle tongue in the pump and balances the pressure on both sides of the baffle tongue, which is beneficial to reducing the vibration at the baffle tongue 10 and has the effect of shock absorption and noise reduction. At the same time, the pressurized surface of the volute 1 adopts two smoothly connected first volute line segments 101 and second volute line segments 102, which is beneficial to more smoothly guide the output water of each water outlet 12, reduce the impact force on the baffle tongue 10, further reduce the vibration and noise at the baffle tongue 10, and improve the water pumping effect.

[0040] 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 volute (1) and an impeller (2) rotatably arranged in the volute (1), wherein the volute (1) is disc-shaped and has a water inlet (11) at the bottom and a water outlet (12) extending spirally outward at the side, characterized in that: There are two water outlets (12), and a partition tongue (10) is formed between each water outlet (12) and the volute (1). The two side walls of the volute (1) are formed into a volute line for pressurizing the water outlet of the corresponding water outlet (12). The volute line includes a first volute line segment (101) and a second volute line segment (102) extending from the partition tongue (10) along the direction of water flow and smoothly transitioning to each other. The second volute line segment (102) has a tendency to expand outwards relative to the first volute line segment (101) along the water outlet direction.

2. The water pump for a cleaning machine according to claim 1, characterized in that: The center of the volute (1) is taken as the origin O, the starting point of the first volute line segment (101) corresponding to the partition tongue (10) is A, the straight line passing through OA is the X-axis, the straight line passing through O and perpendicular to OA is the Y-axis, the spiral angle of point i on the first volute line segment (101) is θ, and the distance from the point to O is RiO, the spiral angle of point i on the second volute line segment (102) is θ, and the distance from the point to O is RiO', then RiO=K 11 θπ / 180+K 12 RiO’=K 21 θπ / 180+K 22 Among them, K 11 >K 21 , K 22 >K 12 .

3. The water pump for a cleaning machine according to claim 2, characterized in that: RiO=4.43θπ / 180+31.9, RiO′=3θπ / 180+35.

27.

4. The water pump for a cleaning machine according to any one of claims 1 to 3, characterized in that: The water outlet (12) forms a direct current section (121) at least at its inlet, and the outer side wall of the direct current section (121) is tangentially connected to the end of the second spiral line section (102).

5. The water pump for a cleaning machine according to claim 4, characterized in that: The partition tongue (10) is formed between the inner wall of the direct current section (121) and the volute (1), and the outer wall of the partition tongue (10) is arranged obliquely to form a guide surface (01), which gradually expands the width of the direct current section (121) at the entrance against the direction of water flow.

6. The water pump for a cleaning machine according to claim 5, characterized in that: The end of the second spiral segment (102) is arranged corresponding to the guide surface (01).

7. The water pump for a cleaning machine according to any one of claims 1 to 3, characterized in that: The impeller (2) comprises an upper cover plate (21), a lower cover plate (22) and a water-drawing blade (23) located between the upper cover plate (21) and the lower cover plate (22); a water suction port (221) arranged corresponding to the water inlet (11) is provided at the central portion of the lower cover plate (22).

8. 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 7, which is arranged in the return water area.

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