Water pump for cleaning machine and cleaning machine

Abstract

The water pump comprises a pump shell with a pump cavity, the bottom of the pump shell is provided with a water inlet communicated with the pump cavity, the side portion of the pump shell is provided with a first flow channel spirally extending outwards in the circumferential direction, and the first flow channel extends outside the pump cavity and is close to the outer side of the pump shell. The side wall, clamped between the pump cavity and the first flow channel, of the pump shell forms a flow dividing partition plate, and the inner end of the flow dividing partition plate forms a first partition tongue of the pump shell. The first flow channel extends close to the outer side wall of the pump cavity, the pump cavity and the first flow channel are separated through the flow dividing partition plate, after part of water flow enters the first flow channel, the direction of the water flow in the first flow channel is basically consistent with the circulation direction of the inner side of the flow dividing partition plate, and therefore pressure on the two sides of the flow dividing partition plate is balanced; the vibration of the first baffle tongue caused by differential pressure impact is greatly reduced, so that the noise is reduced; the pump shell is relatively closed, volume leakage loss is reduced, and water pumping efficiency and lift can be 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 equipped with spray arms for spraying water columns, and a concave return water area is set at the bottom of the box. The top of the return water area is covered with a filter plate. A water pump is used to pump water from the return water area to the spray arm above the filter plate to achieve a circulating spray of washing water. 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.

[0003] CN 201320889409.4 "Open Sink Cleaning Machine" discloses the first generation of open water pump structure developed by the applicant, which realizes the water pump without pipeline water drawing through the cooperation of the guide bracket and the spray arm, and at the same time, its hydraulic output path has no bends, which is convenient for achieving the effect of no residual water after the water pump is used. However, due to the large open area of ​​the guide bracket, the volume leakage loss of the water pump is large, which greatly affects the water pumping efficiency and head of the water pump.

[0004] In order to solve the above problems, the applicant's prior application CN202011629753.0 "A water pump volute for a cleaning machine" has improved the above-mentioned open water pump structure, and in order to meet the two-way water supply requirements of large-volume dishwashers, the pump chamber is divided into upper and lower parts. In fact, the accommodating chamber located at the lower part of the application and the centrifugal impeller disposed therein together constitute a centrifugal water pump structure, and the accommodating chamber and impeller located at the upper part have adopted the water-drawing structure of the first-generation water pump of the applicant, except that the water suction port is changed from the bottom of the water pump to the side. For the lower centrifugal water pump structure formed by it, a circulation is formed in the pump. Every time water is discharged, since the two sides of the water pump baffle correspond to the low-pressure area and the high-pressure area of ​​the water flow respectively, the pressure difference is extremely large, resulting in large vibration at the baffle and generating noise, which seriously affects the user experience.

[0005] Therefore, further improvements need to be made to the water pump structure currently used in cleaning machines. Utility Model Content

[0006] The first technical problem to be solved by the utility model is to provide a water pump for a cleaning machine in view of the current status of the prior art, which can balance the pressure difference on both sides of the baffle tongue to reduce the vibration of the baffle tongue and thus reduce the noise.

[0007] The second technical problem to be solved by the utility model is to provide a water pump for a cleaning machine which can reduce volume leakage and thus improve water pumping efficiency in view of the current status of the prior art.

[0008] The third technical problem to be solved by the utility model is to provide a cleaning machine using the above-mentioned water pump in view of the current status of the prior art.

[0009] The technical solution adopted by the utility model to solve at least one of the above technical problems is:

[0010] A water pump for a cleaning machine comprises a pump casing having a pump chamber, a water inlet connected to the pump chamber being formed at the bottom of the pump casing, a first flow channel extending outwardly along a circumferential spiral being provided on the side of the pump casing, the first flow channel extending outside the pump chamber and close to the outer side of the pump casing, a side wall of the pump casing sandwiched between the pump chamber and the first flow channel forming a diverter baffle, and an inner end of the diverter baffle forming a first baffle tongue of the pump casing.

[0011] Preferably, the side of the pump housing is also provided with a second flow channel extending outwardly along a circumferential spiral, and the second flow channel is arranged at intervals from the first flow channel. Considering that a large-volume dishwasher may require two or more water supplies, the utility model is also provided with the above-mentioned second flow channel to achieve two-way water supply requirements through one water pump.

[0012] Preferably, the outer end of the diversion baffle extends outward along its spiral trend and is connected to the first side of the second flow channel, and the second side of the second flow channel is connected to the side wall of the pump casing and forms a second partition tongue of the pump casing at the connection. Further preferably, the first partition tongue and the second partition tongue are symmetrically arranged in the circumferential direction of the pump casing, and the straight line passing through the first partition tongue and the second partition tongue is L, and the first flow channel and the second flow channel are located on the same side of the straight line L. In the existing centrifugal water pump structure, when two water outlet flow channels need to be set, and the two water outlet flow channels need to be arranged adjacent to each other under specific installation requirements, the partition tongues corresponding to the two water outlet flow channels will also be arranged adjacently, and the two water outlets are output successively, which not only causes the circulation in the pump cavity to be unstable in the circumferential direction and has a large impact on the partition tongues, but also the adjacently arranged partition tongues cause the inner wall of the pump cavity to have uneven pressurization effect on the two water outlets, which not only generates a large noise, but also greatly affects the output head of the two water outlets and the pumping efficiency of the water pump. The utility model realizes the purpose of adjacent arrangement of the first flow channel and the second flow channel by cooperating with the spiral trend of the first flow channel through the flow dividing baffle plate, and at the same time, takes into account the advantage of the symmetrical arrangement of the two baffles, so that the water flow in the pump cavity can circulate stably, and each water outlet is fully pressurized by the inner wall of the corresponding pump casing, which not only effectively reduces the noise, but also helps to improve the head of the two water outlets and the pumping efficiency.

[0013] Preferably, the inner side wall of the flow dividing baffle and the inner side wall of the pump casing between the flow dividing baffle and the second flow channel jointly form a second pressurizing surface for pressurizing the water flow output through the second flow channel. The second pressurizing surface is formed by using the flow dividing baffle and the inner side wall of the pump casing extending downstream thereof, which simplifies the overall structure of the pump and reduces the output stroke of the transition connection between the corresponding parts of the water flow, thereby reducing water flow loss.

[0014] Preferably, along the water flow direction, the inner side wall length of the diverter baffle is 10% to 100% of the length of the second pressurized surface. More preferably, the inner side wall length of the diverter baffle is 50% to 90% of the length of the second pressurized surface. By limiting the length of the diverter baffle, i.e., the shared length of the first flow channel and the inner side wall of the pump chamber, the pressure difference on both sides of the diverter baffle can be balanced, thereby improving the pressurization effect of the water pump on the output water flow and the water discharge head.

[0015] Preferably, a portion of the inner side wall of the pump casing located upstream of the first flow channel forms a first pressurizing surface for pressurizing the water flow output through the first flow channel. This structure mainly pressurizes the water flow output from the first flow channel to ensure that the water flow output from the first flow channel has a larger head.

[0016] Preferably, at least part of the first pressurizing surface and the second pressurizing surface are centrally symmetrically arranged in the circumferential direction, and the center of symmetry of the two is generally the center of the pump casing, or the center of the impeller. Further preferably, the symmetrical part of the first pressurizing surface and the second pressurizing surface in the circumferential direction is not less than 50% of the length of the first pressurizing surface or the second pressurizing surface. Further, the projection of the first pressurizing surface in the horizontal plane forms a first spiral line segment, and the projection of the second pressurizing surface in the horizontal plane forms a second spiral line segment. The first spiral line segment and the second spiral line segment are centrally symmetrically arranged in the circumferential direction, and the center of symmetry of the two is generally the center of the pump casing, or the center of the impeller. Arranging at least part of the first pressurizing surface and the second pressurizing surface centrally symmetrically allows the water flow in the pump to run more smoothly in the circumferential direction, and the pressurization effect of the two water outlets is more uniform, which is conducive to reducing noise and improving the water pumping effect.

[0017] Preferably, the projection of the inner wall of the first flow channel in the horizontal plane is consistent with the spiral trajectory of the corresponding second spiral segment. Such a structure is adopted to make the force transmission on the diverter baffle more uniform and improve the pressure difference balance effect on both sides of the diverter baffle.

[0018] Preferably, the water flow direction at the outer end of the first flow channel is a, the water flow direction at the outer end of the second flow channel is b, and the angle formed between a and b is 15 to 90 degrees. Further preferably, the angle formed between a and b is 30 to 45 degrees. Since in the utility model, the first flow channel extends in a spiral trajectory as a whole, and at least the downstream part of the second flow channel is a straight pipe section, the direction a mentioned above can be considered as the tangent direction of the end of the first flow channel, and the direction b can be considered as the central axis direction of the second flow channel. By adopting the scheme of the utility model, the water outlet directions of the two flow channels are arranged at the above-mentioned angle, so that the two flow channels can be basically adjacent and compact. When installed in the return water area, it only takes up a small space, which can save installation space, help reduce the volume of the return water area, and reduce water consumption.

[0019] In the utility model, a rotatable centrifugal impeller is arranged in the pump chamber, and the centrifugal impeller is used to provide conveying power for the water outlet.

[0020] Preferably, the outer end of the flow dividing baffle is located on the side of the central axis of the second flow channel away from the water inlet. This structure makes the two flow channels close to each other and compact.

[0021] 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. The box body is provided with a spray arm located above the water return area and connected to the flow channel.

[0022] Preferably, the end of the first flow channel is provided with a water guide section extending upward to above the water return area, and the box body is provided with a bottom spray arm arranged near the top of the water return area and connected to the upper end of the water guide section. The water guide section is preferably formed integrally with the water pump, so that the water flow thrown out by the spiral is thrown upward to the bottom spray arm through the water guide section, which is conducive to reducing fluid energy loss.

[0023] Preferably, the water return area is a triangular structure with rounded corners, the water pump is arranged in an installation area constrained by a corner and its adjacent straight edge, and the water guide section is located at the center of the triangular structure. The above structure is adopted to reduce the volume of the water return area and improve the water return efficiency. In addition, the slag collection effect can be improved by reasonably arranging the positions of various functional parts. Specifically: the water return 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 to better cover the tableware cleaning range, the water return area needs to be offset on the bottom wall of the box body, and the slag collection basket located next to the spray arm is also offset on the bottom wall of the box body. In the water return process, the ideal effect is that the water return enters the water return area after filtering the residue through the slag collection basket, and then is further drawn into the spray arm through the water suction port of the open water pump located in the water return area. However, since the offset distance of the slag collection basket relative to the bottom wall of the box body is too large, the water return enters the water return area before it flows to the slag collection basket, resulting in poor slag collection effect and the problem of residue retention 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 can use each corner area of ​​the triangular structure to install the water pump, the slag collection basket, and the heating element, and then guide 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.

[0024] Compared with the prior art, the advantages of the utility model are: the utility model allows the first flow channel to extend close to the outer wall of the pump chamber, and uses a diverter baffle to separate the pump chamber and the first flow channel. When part of the water flows into the first flow channel, the direction of the water flow in the first flow channel is basically consistent with the circulation direction on the inner side of the diverter baffle, thereby balancing the pressure on both sides of the diverter baffle, greatly reducing the vibration of the first baffle tongue caused by the pressure difference impact, thereby reducing noise; the pump casing of the utility model is relatively closed, reducing the volume leakage loss, which is beneficial to improving the water pumping efficiency and lift. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of a water pump in an embodiment of the utility model;

[0026] Figure 2 for Figure 1Schematic diagram of the bottom structure;

[0027] Figure 3 It is an assembly diagram of the lower part of the pump casing and the impeller in the embodiment of the utility model;

[0028] Figure 4 A top view of the lower part of the pump housing in the embodiment of the utility model;

[0029] Figure 5 It is a partial structural schematic diagram of a cleaning machine in an embodiment of the utility model;

[0030] Figure 6 This is an assembly diagram of the functional parts in the return water area in the embodiment of the utility model. DETAILED DESCRIPTION

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] The water pump for a washing machine in this embodiment is mainly used in a dishwasher, and therefore has a small size. Although the manufacturing material is not limited, plastic materials are often used in consideration of manufacturing cost and precision. This is one of the reasons why the water pump is prone to vibration and makes a lot of noise.

[0033] Embodiment 1:

[0034] like Figures 1 to 6 As shown, the water pump for a cleaning machine in this embodiment comprises a pump casing 1 and an impeller 2. The pump casing 1 has a hollow pump chamber 10. The impeller 2 is a centrifugal impeller rotatably disposed in the pump chamber 10. A water inlet 11 is provided at the bottom of the pump casing 1. A first flow channel 01 extending outwardly along a circumferential spiral is provided on the side of the pump casing 1. The first flow channel 01 extends outside the pump chamber 10 and close to the outside of the pump casing 1. The side wall of the pump casing 1 sandwiched between the pump chamber 10 and the first flow channel 01 constitutes a flow dividing baffle 100. The inner end of the flow dividing baffle 100 constitutes a first baffle tongue 001 of the pump casing 1. In this embodiment, the first flow channel 01 extends close to the outer wall of the pump chamber 10, and the diverter baffle 100 is used to separate the pump chamber 10 and the first flow channel 01. When part of the water flows into the first flow channel 01, the direction of the water flow in the first flow channel 01 is basically consistent with the circulation direction on the inner side of the diverter baffle 100, thereby balancing the pressure on both sides of the diverter baffle 100, greatly reducing the vibration of the first baffle 001 caused by the pressure difference impact, thereby reducing noise; the pump casing 1 of this embodiment is relatively closed, which reduces the volume leakage loss and is beneficial to improving the water pumping efficiency and lift.

[0035] Embodiment 2:

[0036] The difference between this embodiment and embodiment 1 is that the pump housing 1 of this embodiment is provided with two water outlet channels.

[0037] like Figures 1 to 6As shown, in this embodiment, the side of the pump housing 1 is further provided with a second flow channel 02 extending outwardly along a circumferential spiral, and the second flow channel 02 is arranged at intervals from the first flow channel 01. Considering that a large-volume dishwasher may require two-way or multi-way water supply, the utility model is further provided with the above-mentioned second flow channel 01 to achieve the two-way water supply requirement through one water pump.

[0038] The outer end of the flow dividing baffle 100 extends outward along its spiral trend and is connected to the first side of the second flow channel 02. The second side of the second flow channel 02 is connected to the side wall of the pump housing 1 and forms the second partition tongue 002 of the pump housing 1 at the connection. The first partition tongue 001 and the second partition tongue 002 are arranged symmetrically in the circumferential direction of the pump housing 1. The straight line passing through the first partition tongue 001 and the second partition tongue 002 is L. The first flow channel 01 and the second flow channel 02 are located on the same side of the straight line L. In the existing centrifugal water pump structure, when two water outlet flow channels need to be set, and the two water outlet flow channels need to be arranged adjacently under specific installation requirements, the partition tongues corresponding to the two water outlet flow channels will also be arranged adjacently, and the two water outlets are output successively, which not only causes the circulation in the pump cavity to be unstable in the circumferential direction and has a large impact on the partition tongues, but also the adjacently arranged partition tongues cause the inner wall of the pump cavity to pressurize the two water outlets unevenly, which not only generates a large noise, but also greatly affects the output head of the two water outlets and the pumping efficiency of the water pump. The utility model realizes the purpose of adjacent arrangement of the first flow channel and the second flow channel by cooperating with the spiral trend of the first flow channel through the flow dividing baffle plate, and at the same time, takes into account the advantage of the symmetrical arrangement of the two baffles, so that the water flow in the pump cavity can circulate stably, and each water outlet is fully pressurized by the inner wall of the corresponding pump casing, which not only effectively reduces the noise, but also helps to improve the head of the two water outlets and the pumping efficiency.

[0039] The inner wall of the pump casing 1 located upstream of the first flow channel 01 forms a first pressurizing surface 011 for pressurizing the water flow output through the first flow channel 01. This structure is mainly used to pressurize the water flow output from the first flow channel 01 to ensure that the water flow output from the first flow channel 01 has a large head. The inner wall of the flow dividing baffle 100 and the inner wall of the pump casing 1 between it and the second flow channel 02 together form a second pressurizing surface 021 for pressurizing the water flow output through the second flow channel 02. The second pressurizing surface 021 is formed by using the flow dividing baffle 100 and the inner wall of the pump casing 1 extending downstream thereof, which simplifies the overall structure of the pump and reduces the output stroke of the transition connection of each part of the water flow to reduce water flow loss.

[0040] Along the water flow direction, the length of the inner wall of the diverter baffle 100 is 10% to 100%, preferably 50% to 90%, of the length of the second pressurizing surface 021. The length of the diverter baffle 100, i.e., the shared length of the first flow channel 01 and the inner wall of the pump chamber 10, is limited in order to improve the pressurizing effect of the water pump on the output water flow and increase the water discharge head while balancing the pressure difference on both sides of the diverter baffle 100.

[0041] In this embodiment, at least part of the first pressurizing surface 011 and the second pressurizing surface 021 are arranged symmetrically in the circumferential direction. The symmetrical part of the first pressurizing surface 011 and the second pressurizing surface 021 in the circumferential direction is not less than 50% of the length of the first pressurizing surface 011 or the second pressurizing surface 021. Further, the projection of the first pressurizing surface 011 in the horizontal plane forms the first spiral segment 012, and the projection of the second pressurizing surface 021 in the horizontal plane forms the second spiral segment 022, and the first spiral segment 012 and the second spiral segment 022 are arranged symmetrically in the circumferential direction. The symmetrical arrangement of at least part of the first pressurizing surface 011 and the second pressurizing surface 021 allows the water flow in the pump to run more smoothly in the circumferential direction, and the pressurization effect of the two water outlets is more uniform, which is conducive to reducing noise and improving the water pumping effect.

[0042] The projection of the inner wall of the first flow channel 01 in the horizontal plane is consistent with the spiral trajectory of the corresponding second spiral segment 022. Such a structure is adopted to make the force transmission on the flow dividing baffle 100 more uniform and improve the pressure difference balance effect on both sides of the flow dividing baffle.

[0043] In this embodiment, the water flow direction at the outer end of the first flow channel 01 is a, and the water flow direction at the outer end of the second flow channel 02 is b. The angle m formed between a and b is 15 to 90 degrees, preferably 30 to 45 degrees. Since in the embodiment, the first flow channel 01 extends as a spiral trajectory as a whole, and at least the downstream portion of the second flow channel 02 is a straight pipe section, the direction a mentioned above can be considered as the tangent direction of the end of the first flow channel 01, and the direction b can be considered as the central axis direction of the second flow channel 02. By adopting the solution of this embodiment, the water outlet directions of the two flow channels are arranged at the above-mentioned angle, so that the two flow channels can be basically adjacent and compact, and can fit well with the triangular structure mentioned later. When installed in the return water area, it only takes up a small space, which can save installation space, help reduce the volume of the return water area, and reduce water consumption.

[0044] The cleaning machine of this embodiment includes a housing 3, a concave water return area 31 is provided at the bottom of the housing 3, and the water pump is provided in the water return area 31. The housing 3 is provided with a spray arm located above the water return area 31 and connected to the flow channel. Specifically, a water guide section 013 extending upward to above the water return area 31 is provided at the end of the first flow channel 01, and a bottom spray arm 4 arranged near the top of the water return area 31 and connected to the upper end of the water guide section 013 is provided in the housing 3. The water guide section 013 is preferably formed integrally with the water pump, so that the water flow thrown out by the spiral is thrown upward to the bottom spray arm 4 through the water guide section 013, which is conducive to reducing the fluid energy loss. A motor is provided at the bottom of the housing 3, and the output shaft of the motor is upward and passes through the housing 3 and the water inlet 11 to be connected to the impeller 2.

[0045] In this embodiment, the water return area 11 is a triangular structure with rounded corners, the water pump is arranged in the installation area enclosed by a corner and its adjacent straight edge, and the water guide section 013 is located at the center of the triangular structure. The water return area 31 is located in the central part of the bottom of the box body 3. From a top view, the water pump is offset relative to the center of the water return area 31 in the water return area 31, and the water outlet of the water pump (i.e., the upper port of the water guide section 013) is arranged in the center of the water return area 31. The above structure is conducive to reducing the volume of the water return area and improving the water return efficiency. In addition, the slag collection effect can be improved by reasonably arranging the positions of various functional parts. Specifically: 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. In this embodiment, the return water area 31 is set as a triangular structure, and each corner area of ​​the triangular structure can be used to install the water pump, the slag collection basket 5, and the heating element 6. Then, the water outlet of the water pump is offset horizontally relative to the center of the water pump to guide the outlet to the remaining space in the central part of the triangular structure, which maximizes the use of the space of the return water area, not only greatly reducing the volume of the return water area, which is beneficial to saving the amount of washing water each time, but also to improving 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 improving the slag collection effect.

[0046] 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 (1) having a pump chamber (10), characterized in that: The bottom of the pump housing (1) is provided with a water inlet (11) which is connected to the pump chamber (10); the side of the pump housing (1) is provided with a first flow channel (01) which extends outwardly along a circumferential spiral; the first flow channel (01) extends outside the pump chamber (10) close to the outside of the pump housing (1); the side wall of the pump housing (1) sandwiched between the pump chamber (10) and the first flow channel (01) constitutes a diverter baffle (100); the inner end of the diverter baffle (100) constitutes a first baffle tongue (001) of the pump housing (1).

2. The water pump for a cleaning machine according to claim 1, characterized in that: The side of the pump housing (1) is also provided with a second flow channel (02) extending outwardly along a circumferential spiral, and the second flow channel (02) is arranged at an interval with the first flow channel (01).

3. The water pump for a cleaning machine according to claim 2, characterized in that: The junction between the second flow channel (02) and the side wall of the pump casing (1) forms a second partition tongue (002) of the pump casing (1).

4. The water pump for a cleaning machine according to claim 3, characterized in that: The inner side wall of the flow dividing baffle (100) and the inner side wall of the pump housing (1) between the flow dividing baffle (100) and the second flow channel (02) jointly form a second pressurizing surface (021) for pressurizing the water flow output through the second flow channel (02).

5. The water pump for a cleaning machine according to claim 4, characterized in that: Along the water flow direction, the length of the inner side wall of the diversion baffle (100) is 10% to 100% of the length of the second pressurizing surface (021).

6. The water pump for a cleaning machine according to claim 5, characterized in that: The length of the inner wall of the flow dividing baffle (100) is 50% to 90% of the length of the second pressurizing surface (021).

7. The water pump for a cleaning machine according to claim 4, characterized in that: The inner wall of a portion of the pump casing (1) located upstream of the first flow channel (01) forms a first pressurizing surface (011) for pressurizing the water flow output through the first flow channel (01).

8. The water pump for a cleaning machine according to claim 7, characterized in that: At least parts of the first pressurizing surface (011) and the second pressurizing surface (021) are arranged symmetrically in the circumferential direction.

9. The water pump for a cleaning machine according to claim 8, characterized in that: The symmetrical portion of the first pressurizing surface (011) and the second pressurizing surface (021) in the circumferential direction is not less than 50% of the length of the first pressurizing surface (011) or the second pressurizing surface (021).

10. The water pump for a cleaning machine according to claim 7, characterized in that: The projection of the first pressurizing surface (011) in the horizontal plane forms a first spiral segment (012), and the projection of the second pressurizing surface (021) in the horizontal plane forms a second spiral segment (022), and the first spiral segment (012) and the second spiral segment (022) are arranged symmetrically in the circumferential direction.

11. The water pump for a cleaning machine according to claim 10, characterized in that: The projection of the inner wall of the first flow channel (01) in the horizontal plane is consistent with the spiral trajectory of the corresponding second spiral line segment (022).

12. The water pump for a cleaning machine according to any one of claims 3 to 11, characterized in that: The first partition tongue (001) and the second partition tongue (002) are symmetrically arranged in the circumferential direction of the pump housing (1), a straight line passing through the first partition tongue (001) and the second partition tongue (002) is L, and the first flow channel (01) and the second flow channel (02) are located on the same side of the straight line L.

13. The water pump for a cleaning machine according to any one of claims 2 to 11, characterized in that: The water flow direction at the outer end of the first flow channel (01) is a, the water flow direction at the outer end of the second flow channel (02) is b, and the angle (m) formed between a and b is 15 to 90 degrees.

14. The water pump for a cleaning machine according to claim 13, characterized in that: The angle (m) formed between a and b is 30 to 45 degrees.

15. The water pump for a cleaning machine according to any one of claims 2 to 11, characterized in that: The outer end of the flow dividing baffle (100) is located on a side of the central axis of the second flow channel (02) away from the water inlet (11).

16. The water pump for a cleaning machine according to any one of claims 1 to 11, characterized in that: A rotatable impeller (2) is arranged in the pump chamber (10).

17. A cleaning machine, comprising a box (3), wherein a concave water return area (31) is provided at the bottom of the box (3), characterized in that: It also comprises a water pump as claimed in any one of claims 1 to 16, wherein the water pump is arranged in the water return area (31), and the box body (3) is provided with a spray arm located above the water return area (31) and connected to the flow channel.

18. The cleaning machine according to claim 17, characterized in that: A water guide section (013) extending upward to above the water return area (31) is provided at the end of the first flow channel (01), and a bottom spray arm arranged near the top of the water return area (31) and connected to the upper end of the water guide section (013) is provided in the box body (3).

19. The cleaning machine according to claim 18, characterized in that: The water return area (31) is a triangular structure with rounded corners, the water pump is arranged in an installation area constrained by a corner and its adjacent straight edge, and the water guide section (013) is located at the center of the triangular structure.

Images