Water pump for cleaning machine and cleaning machine

Abstract

The water pump comprises a pump shell and an impeller, the side portion of the pump shell spirally extends outwards in the circumferential direction to form at least two relatively independent flow channels, a partition tongue is formed between an inlet of each flow channel and a pump cavity, the distance between the impeller and the partition tongue is h, the diameter of the impeller is D, and h / D = 0.075-0.345. The impeller is completely surrounded by the water pump, so that the volume leakage loss is reduced; at least two relatively independent spiral flow channels are arranged in the circumferential direction of the pump shell, in the circulation conveying process of water flow in the pump, a part of water is shunted along the spiral trend of the water flow every time the water flow passes through one flow channel, and multidirectional drawing of the water flow is achieved in this way; due to the fact that part of pressure at the position of the corresponding baffle tongue in the pump is offset by water flow separated from the flow channels, the pressure on the two sides of the baffle tongue is balanced, the problem of pressure build-up on the inner side of the baffle tongue is solved, and the damping and noise reduction effects are achieved on the basis that the water pumping efficiency 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 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] ZL 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 water pump volume leakage loss is large, which greatly affects the water pumping efficiency and lift 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 washing machine" has improved the above 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 lower accommodating chamber and the centrifugal impeller disposed therein in the application together constitute a centrifugal water pump structure, and the upper accommodating chamber and impeller use the water-drawing structure of the first-generation water pump of the applicant, except that the water inlet 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 zone and the high-pressure zone of the water flow, the pressure difference is extremely large, resulting in a pressure-blocking situation on the inner side of the baffle, and the baffle and the corresponding pump body have a large vibration amplitude, which not only generates a large noise, but also greatly affects the water pumping efficiency; for the upper water-drawing structure formed by it, there is still a certain volume leakage problem, which affects the water pumping efficiency and head of the water pump.

[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 response to the current status of the prior art, which can eliminate the problem of pressure buildup inside the baffle by performing natural diversion and pressure balancing, thereby improving water pumping efficiency, reducing vibration and 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 and an impeller arranged in the pump casing, wherein a water inlet is provided at the bottom of the pump casing, and the side of the pump casing extends outward along a circumferential spiral to form at least two relatively independent flow channels, and a partition tongue is formed between the inlet of each flow channel and the pump chamber, the distance between the impeller and the partition tongue is h, the diameter of the impeller is D, and h / D=0.075~0.345.

[0011] As a preferred solution of the utility model, the flow channel includes a first flow channel and a second flow channel, a first partition tongue is formed between the inlet of the first flow channel and the pump chamber, and a second partition tongue is formed between the inlet of the second flow channel and the pump chamber. The two flow channels can eliminate the pressure holding problem of the water in the pump chamber through diversion, and can also maintain a high water flow output head of each flow channel.

[0012] Preferably, the distance between the impeller and the first baffle is h1, the distance between the impeller and the second baffle is h2, the area of ​​the first flow channel entrance is S1, the area of ​​the second flow channel entrance is S2, S2 / S1≥1, h1=(a1-1)D / 2, h2=((S2 / S1)*a2-1)D / 2, wherein a1=1.15~1.3, a2=1.15~1.3. Or,

[0013] The distance between the impeller and the first baffle tongue is h1, the distance between the impeller and the second baffle tongue is h2, the area of ​​the first flow channel entrance is S1, the area of ​​the second flow channel entrance is S2, h1 / h2=(a1-1) / ((S2 / S1)*a2-1), wherein a1=1.15~1.3, a2=1.15~1.3.

[0014] Taking into account that the water flow rates of different flow channels can be the same or different as needed, when the water flow rates drawn out of different flow channels are different, vibration and noise may be generated due to the unstable flow state in the pump. The utility model adjusts the corresponding spacing between the tongues to perform a double balance of water flow and pressure at the inlet of the flow channels outputting different flow rates, so as to reduce vibration and noise.

[0015] Preferably, the area of ​​the first flow channel entrance is S1, the area of ​​the second flow channel entrance is S2, the base circle diameter of the first flow channel entrance is D1, the base circle diameter of the second flow channel entrance is D2, D1 = a1*D, D2 = (S2 / S1)*a2*D, wherein a1 = 1.15-1.3, a2 = 1.15-1.3. Further preferably, S2 / S1 = 1-1.3. The outlet flow channel is used to form an "island effect" by diverting the flow on the basis of the internal circulation of the pump, that is, taking the impeller as an island, a relatively stable circulation is formed by diverting and dividing the flow and pressure at the periphery of the impeller. For impellers of corresponding diameters, the base circle diameters of the corresponding inlets are optimized for different outlet flow channels, which is conducive to reliable diversion and coordination of each outlet flow channel in the circumferential direction, forming a more stable circulation, so that the fluid in the pump does not have local pressure build-up and the overall flow is stable, thereby improving the pumping efficiency and reducing vibration and noise.

[0016] Preferably, the area of ​​the first flow channel entrance is S1, the area of ​​the second flow channel entrance is S2, the distance between the impeller and the first baffle is h1, and the distance between the impeller and the second baffle is h2, then when S1=S2, h1=h2. When S1=S2, that is, the outlet heads corresponding to the first flow channel and the second flow channel are equivalent, at this time, under the condition that the double outlet flow channels eliminate the pressure in the pump, the radial force of the impeller is also balanced by the outlet flow rate, which can further reduce the vibration and noise of the water pump.

[0017] Preferably, the volute corresponding to the pump housing includes a first volute segment for pressurizing water entering the first flow channel and a second volute segment for pressurizing water entering the second flow channel, and the first volute segment and the second volute segment are symmetrically arranged in the circumferential direction of the pump housing. The first baffle tongue and the second baffle tongue are symmetrically arranged in the circumferential direction of the pump housing. When two flow channels are provided, the use of symmetrically arranged volute segments can not only make the pressurization of the corresponding flow channels more stable, but also further balance the radial force of the impeller in the circumferential direction, so that the flow channel presents a stable water flow output effect, minimizes impeller vibration, and reduces shock and noise.

[0018] Preferably, the pump housing has a disc-shaped body, and the inlets of the first flow channel and the second flow channel are arranged symmetrically in the circumferential direction of the body, but the first flow channel and the second flow channel have different spiral angles. If the spiral angles of the first flow channel and the second flow channel are the same, the water pump as a whole will occupy a large volume in the horizontal plane, and if the flow channels can adopt different spiral angles, the overall volume of the water pump can be reduced on the basis of conveniently adjusting the water outlet direction of the flow channel, and it is more suitable to be installed as an open water pump in the return water area, saving installation space and improving return water efficiency.

[0019] As another preferred embodiment of the utility model, the flow channel includes a first flow channel, a second flow channel, and a third flow channel, a first partition tongue is formed between the inlet of the first flow channel and the pump chamber, a second partition tongue is formed between the inlet of the second flow channel and the pump chamber, and a third partition tongue is formed between the inlet of the third flow channel and the pump chamber. The three flow channels can eliminate the problem of pressure retention by diverting the water in the pump chamber, and can also realize multi-channel water supply through one pump as needed.

[0020] Preferably, the distance between the impeller and the first baffle tongue is h1, the distance between the impeller and the second baffle tongue is h2, the distance between the impeller and the third baffle tongue is h3, the area of ​​the first flow channel entrance is S1, the area of ​​the second flow channel entrance is S2, the area of ​​the third flow channel entrance is S3, h1 = (a1-1)D / 2, h2 = ((S2 / S1)*a2-1)D / 2, h3 = ((S3 / S1)*a3-1)D / 2, wherein a1 = 1.15-1.3, a2 = 1.15-1.3, a3 = 1.15-1.3. Considering that the water flow rates diverted from different flow channels can be the same or different as needed, when the water flow rates drawn out from different flow channels are different, vibration and noise may be generated due to unstable flow in the pump. The utility model adjusts the corresponding baffle tongue spacing to perform dual balance of water flow and pressure at the entrance of the flow channels outputting different flow rates to reduce vibration and noise.

[0021] Preferably, the area of ​​the first flow channel entrance is S1, the area of ​​the second flow channel entrance is S2, the area of ​​the third flow channel entrance is S3, the base circle diameter of the first flow channel entrance is D1, the base circle diameter of the second flow channel entrance is D2, the base circle diameter of the third flow channel entrance is D3, D1 = a1*D, D2 = (S2 / S1)*a2*D, D3 = (S3 / S1)*a3*D, wherein a1 = 1.15 to 1.3, a2 = 1.15 to 1.3, a3 = 1.15 to 1.3. Further preferably, S2 / S1 ≥ 1, S3 / S2 ≥ 1, S3 / S2 ≥ S2 / S1, S3 / S1 = 1 to 1.3. The outlet flow channel is used to form an "island effect" by diverting flow on the basis of the circulation in the pump, that is, taking the impeller as an island, a relatively stable circulation is formed around the impeller by diverting flow and dividing pressure. For impellers of corresponding diameters, the base circle diameters of the corresponding inlets are optimized for different outlet flow channels, which is conducive to reliable diversion and coordination of the circumferential direction of each outlet flow channel, forming a more stable circulation, preventing local pressure build-up in the fluid in the pump and stabilizing the overall flow state, thereby improving pumping efficiency and reducing vibration and noise.

[0022] Preferably, the impeller is a centrifugal impeller, the bottom of the impeller has an impeller inlet corresponding to the water inlet of the pump casing, and the side of the impeller has an impeller outlet corresponding to the inner side wall of the pump casing.

[0023] A water pump for a cleaning machine comprises a pump casing and an impeller arranged in the pump casing, a water inlet is provided at the bottom of the pump casing, the side of the pump casing extends outward along a circumferential spiral to form at least two relatively independent flow channels, a partition tongue is formed between the inlet of each flow channel and the pump chamber, and the spacing between the impeller and the partition tongue is h, h=5~7.5mm.

[0024] 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.

[0025] Preferably, a water guide section extending upward to the water return area is provided at the end of the flow channel, and a bottom spray arm arranged near the top of the water return area and connected to the upper end of the water guide section is provided in the box. The water guide section is preferably integrally formed 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.

[0026] Preferably, the water return area 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 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.

[0027] Compared with the prior art, the advantages of the utility model are: the pump casing of the utility model completely surrounds the impeller, which reduces the volume leakage loss compared with the first generation of open water pumps, and is beneficial to improving the water pumping efficiency and head; the utility model arranges at least two relatively independent spiral flow channels on the circumference of the pump casing, and during the circulation transportation process of the water flow in the pump, each time it passes through a flow channel, a part of the water is diverted along the spiral trend of the water flow. In this way, not only the multi-directional absorption of the water flow is realized, but also the water flow diverted by each flow channel 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, eliminating the problem of pressure build-up on the inside of the baffle tongue. On the basis of improving the water pumping efficiency, the violent vibration of the baffle tongue is avoided, thereby achieving the effect of shock absorption and noise reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1This is a schematic diagram of the structure of the water pump in Example 1 of the utility model;

[0029] Figure 2 for Figure 1 Schematic diagram of the bottom structure;

[0030] Figure 3 This is a diagram showing the assembly position relationship between the lower part of the pump casing and the impeller in Embodiment 1 of the present utility model;

[0031] Figure 4 This is a partial structural schematic diagram of a cleaning machine according to Embodiment 1 of the utility model;

[0032] Figure 5 for Figure 4 Assembly position relationship diagram of the grey water pump and the return water area;

[0033] Figure 6 This is a schematic diagram of the pump housing and its flow channel in Example 3 of the utility model. DETAILED DESCRIPTION

[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0035] 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.

[0036] Embodiment 1:

[0037] like Figures 1 to 5As shown, the water pump for the cleaning machine of this embodiment includes a pump housing 1 and an impeller 2 arranged in the pump housing 1. The bottom of the pump housing 1 is provided with a water inlet 11. The side of the pump housing 1 extends outward along the circumferential spiral to form at least two relatively independent flow channels. A tongue is formed between the inlet of each flow channel and the pump chamber 10. The distance between the impeller 2 and the tongue is h. The diameter of the impeller 2 is D, and h / D = 0.075-0.345. When the above distance h is too small, the efficiency of the water pump is low and a lot of worm noise will be generated; when the distance h is too large, although the worm noise can be avoided, the efficiency of the water pump is very low. This is because, at the diaphragm (i.e., the volute of the pump casing), part of the pressurized water is diverted from the outside of the volute through the flow channel to the outside, and part of it flows back from the inside of the volute to the next volute line segment, thereby establishing a relatively stable laminar flow on both sides of the volute, and the two act on the volute from both sides to suppress its vibration; on the other hand, the water flowing back to the next volute line is diverted again at the outlet of the next flow channel, and part or all of it is diverted to the outside, reducing the efficiency loss caused by the idling of the return water in the volute. In this embodiment, by setting h / D=0.075~0.345, the diversion ratio can be controlled within a reasonable range, achieving a better shock absorption and noise reduction effect, while maintaining a higher water pump efficiency. After experimental testing, it was found that for a water pump with an impeller diameter of D, when h / D=0.075~0.345, the volute noise can be within an acceptable range while satisfying the water pump flow rate of not less than 40L / min and the head of not less than 2 meters.

[0038] In this embodiment, the distance between the impeller and the baffle is h=5-7.5 mm, which can ensure that the water pump flow is not less than 40 L / min and the head is not less than 2 meters while keeping the snail noise within an acceptable range.

[0039] Although the distance between the impeller 2 and the baffle is controlled within the above range, the pumping efficiency and the noise level can be taken into account, but it should be emphasized that the baffle spacing mentioned in the present embodiment does not exist independently, but is mainly for cooperating with more than one flow channel so that the water flows in the pump chamber 10 with the impeller 2 as the landing point to form an island effect, that is, the water flows in the pump chamber 10 always circulates around the impeller 2 relatively steadily, and each time it passes through a flow channel, a part of the water is diverted through the corresponding flow channel along the spiral trend of the water flow. In this way, not only the multi-directional absorption of the water flow is realized, but also the water flow diverted by each flow channel offsets a part of the pressure at the corresponding baffle in the pump and balances the pressure on both sides of the baffle, eliminating the pressure build-up problem on the inside of the baffle. On the basis of improving the pumping efficiency, the violent vibration of the baffle is avoided, thereby achieving the effect of shock absorption and noise reduction.

[0040] Specifically, two flow channels are provided in this embodiment, namely, the first flow channel 01 and the second flow channel 02. A first baffle 011 is formed between the inlet of the first flow channel 01 and the pump chamber 10, and a second baffle 021 is formed between the inlet of the second flow channel 02 and the pump chamber 10. The two flow channels can eliminate the problem of pressure retention by diverting the water in the pump chamber 10, and can also maintain a high water output head of each flow channel.

[0041] In this embodiment, the area of ​​the inlet of the first flow channel 01 is S1, the area of ​​the inlet of the second flow channel 02 is S2, the distance between the impeller 2 and the first baffle 011 is h1, and the distance between the impeller 2 and the second baffle 021 is h2. The distance between the impeller 2 and the first baffle 011 is h1, the distance between the impeller 2 and the second baffle 021 is h2, the area of ​​the inlet of the first flow channel 01 is S1, and the area of ​​the inlet of the second flow channel 02 is S2, S2 / S1≥1, h1=(a1-1)D / 2, h2=((S2 / S1)*a2-1)D / 2, h1 / h2=(a1-1) / ((S2 / S1)*a2-1), wherein a1=1.15~1.3, a2=1.15~1.3. Taking into account that the water flow rates of different flow channels can be the same or different as needed, when the water flow rates drawn out of different flow channels are different, vibration and noise may be generated due to the unstable flow state in the pump. The utility model adjusts the corresponding spacing between the tongues to perform a double balance of water flow and pressure at the inlet of the flow channels outputting different flow rates, so as to reduce vibration and noise.

[0042] The base circle diameter of the entrance of the first flow channel 01 is D1, and the base circle diameter of the entrance of the second flow channel 02 is D2, D1 = a1*D, D2 = (S2 / S1)*a2*D, wherein a1 = 1.15-1.3, a2 = 1.15-1.3. In this embodiment, S2 / S1 = 1-1.3. The outlet flow channel is used to form an "island effect" by diverting the flow on the basis of the internal circulation of the pump, that is, taking the impeller as an island, a relatively stable circulation is formed around the impeller by diverting the flow and dividing the pressure. For impellers of corresponding diameters, the base circle diameters of the corresponding entrances are optimized for different outlet flow channels, which is conducive to reliable coordination of the circumferential diversion of each outlet flow channel, forming a more stable circulation, preventing local pressure build-up in the fluid in the pump, and stabilizing the overall flow state, thereby improving pumping efficiency and reducing vibration and noise. Utility model

[0043] In this embodiment, the volute corresponding to the pump housing 1 includes a first volute segment a for pressurizing water entering the first flow channel 01, and a second volute segment b for pressurizing water entering the second flow channel 02. The first volute segment a and the second volute segment b are symmetrically arranged in the circumferential direction of the pump housing 1. The first baffle tongue 011 and the second baffle tongue 021 are symmetrically arranged in the circumferential direction of the pump housing 1. With the above structure, the relationship between the output flow rate of each flow channel and the spacing between the baffle tongues is balanced in combination with the corresponding pressurized volute segments, so as to more accurately set the water pump structure, eliminate the pressure buildup and noise problems in the pump, maintain good water pumping efficiency, and reduce shock and noise. When two flow channels are set, the use of symmetrically arranged volute segments can not only make the pressurization of the corresponding flow channels more stable, but also further balance the radial force of the impeller in the circumferential direction, so that the flow channel presents a stable water flow output effect, minimizes the vibration of the impeller, and reduces shock and noise.

[0044] The pump housing 1 of this embodiment has a disc-shaped body, and the inlets of the first flow channel 01 and the second flow channel 02 are arranged symmetrically in the circumferential direction of the body, but the spiral angles of the first flow channel 01 and the second flow channel 02 are different. If the spiral angles of the first flow channel 01 and the second flow channel 02 are the same, the water pump as a whole will occupy a large volume in the horizontal plane, and if the flow channels can adopt different spiral angles, the overall volume of the water pump can be reduced on the basis of conveniently adjusting the water outlet direction of the flow channel, and it is more suitable to be installed as an open water pump in the return water area, saving installation space and improving return water efficiency.

[0045] The impeller 2 of this embodiment is a centrifugal impeller. The bottom of the impeller 2 has an impeller inlet corresponding to the water inlet 11 of the pump casing 1 , and the side of the impeller 2 has an impeller outlet corresponding to the inner side wall of the pump casing 1 .

[0046] 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 012 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 is provided near the top of the water return area 31 and connected to the upper end of the water guide section 012. The water guide section 012 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 012, which is conducive to reducing fluid energy loss.

[0047] In this embodiment, the return water area 11 is a triangular structure with rounded corners, the water pump 2 is arranged in the installation area enclosed by a corner and its adjacent straight edge, and the water guide section 012 is located at the center of the triangular structure. The return water 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 return water area 31 in the return water area 31, and the water outlet of the water pump (i.e., the upper port of the water guide section 012) is arranged in the center of the return water area 31. The above structure is conducive to reducing the volume of the return water area and improving the return water 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.

[0048] Embodiment 2:

[0049] In this embodiment, based on the embodiment 1, D=52mm, D1=D2=66mm, S1=S2=200mm 2 , S2 / S1=1, h1=h2=7mm, a1=a2=1.27. When S1=S2, that is, the outlet lifts of the first flow channel 01 and the second flow channel 02 are equivalent, at this time, the double outlet flow channels eliminate the pressure in the pump, and the radial force of the impeller is balanced by the outlet flow, which can further reduce the vibration and noise of the water pump.

[0050] According to actual measurements, the actual water pumping efficiency of this embodiment reaches 48%, and the noise performance is 50.1dB, which is significantly better than the existing water pump with a water pumping efficiency of 43% and a noise performance of 56.3b.

[0051] Embodiment 3:

[0052] The difference between this embodiment and embodiment 1 is that three water outlet channels are provided in this embodiment.

[0053] like Figure 6 As shown, the flow channel of this embodiment includes a first flow channel 01, a second flow channel 02, and a third flow channel 03. A first partition tongue 011 is formed between the inlet of the first flow channel 01 and the pump chamber 10, a second partition tongue 021 is formed between the inlet of the second flow channel 02 and the pump chamber 10, and a third partition tongue 031 is formed between the inlet of the third flow channel 03 and the pump chamber 10. The three flow channels can eliminate the problem of pressure retention by diverting the water in the pump chamber, and can also realize multi-channel water supply through one pump as needed.

[0054] The distance between the impeller 2 and the first partition tongue 011 is h1, the distance between the impeller 2 and the second partition tongue 021 is h2, the distance between the impeller 2 and the third partition tongue 031 is h3, the area of ​​the entrance of the first flow channel 01 is S1, the area of ​​the entrance of the second flow channel 02 is S2, and the area of ​​the entrance of the third flow channel 03 is S3, h1 = (a1-1)D / 2, h2 = ((S2 / S1)*a2-1)D / 2, h3 = ((S3 / S1)*a3-1)D / 2, wherein a1 = 1.15~1.3, a2 = 1.15~1.3, a3 = 1.15~1.3. Taking into account that the water flow rates of different flow channels can be the same or different as needed, when the water flow rates drawn out of different flow channels are different, vibration and noise may be generated due to the unstable flow state in the pump. The utility model adjusts the corresponding spacing between the tongues to perform a double balance of water flow and pressure at the inlet of the flow channels outputting different flow rates, so as to reduce vibration and noise.

[0055] The base circle diameter of the entrance of the first flow channel 01 is D1, the base circle diameter of the entrance of the second flow channel 02 is D2, and the base circle diameter of the entrance of the third flow channel 03 is D3. D1 = a1*D, D2 = (S2 / S1)*a2*D, D3 = (S3 / S1)*a3*D, wherein a1 = 1.15 to 1.3, a2 = 1.15 to 1.3, and a3 = 1.15 to 1.3. In this embodiment, S2 / S1 ≥ 1, S3 / S2 ≥ 1, S3 / S2 ≥ S2 / S1, and S3 / S1 = 1 to 1.3. The outlet flow channel is used to form an "island effect" by diverting flow on the basis of the circulation in the pump, that is, taking the impeller as an island, a relatively stable circulation is formed around the impeller by diverting flow and dividing pressure. For impellers of corresponding diameters, the base circle diameters of the corresponding inlets are optimized for different outlet flow channels, which is conducive to reliable diversion and coordination of the circumferential direction of each outlet flow channel, forming a more stable circulation, preventing local pressure build-up in the fluid in the pump and stabilizing the overall flow state, thereby improving pumping efficiency and reducing vibration and noise.

[0056] 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) and an impeller (2) arranged in the pump housing (1), characterized in that: The side of the pump housing (1) extends outward along a circumferential spiral to form at least two relatively independent flow channels, and a partition tongue is formed between the inlet of each flow channel and the pump chamber (10), the distance between the impeller (2) and the partition tongue is h, the diameter of the impeller is D, and h / D=0.075~0.

345.

2. The water pump for a cleaning machine according to claim 1, characterized in that: The flow channel comprises a first flow channel (01) and a second flow channel (02); a first partition tongue (011) is formed between the inlet of the first flow channel (01) and the pump chamber (10); and a second partition tongue (021) is formed between the inlet of the second flow channel (02) and the pump chamber (10).

3. The water pump for a cleaning machine according to claim 2, characterized in that: The distance between the impeller (2) and the first partition tongue (011) is h1, the distance between the impeller (2) and the second partition tongue (021) is h2, the area of ​​the entrance of the first flow channel (01) is S1, the area of ​​the entrance of the second flow channel (02) is S2, S2 / S1≥1, h1=(a1-1)D / 2, h2=((S2 / S1)*a2-1)D / 2 Among them, a1=1.15~1.3, a2=1.15~1.

3.

4. The water pump for a cleaning machine according to claim 2, characterized in that: The distance between the impeller (2) and the first partition tongue (011) is h1, the distance between the impeller (2) and the second partition tongue (021) is h2, the area of ​​the entrance of the first flow channel (01) is S1, the area of ​​the entrance of the second flow channel (02) is S2, S2 / S1≥1, h1 / h2=(a1-1) / ((S2 / S1)*a2-1) Among them, a1=1.15~1.3, a2=1.15~1.

3.

5. The water pump for a cleaning machine according to claim 2, characterized in that: The area of ​​the entrance of the first flow channel (01) is S1, the area of ​​the entrance of the second flow channel (02) is S2, the base circle diameter of the entrance of the first flow channel (01) is D1, the base circle diameter of the entrance of the second flow channel (02) is D2, S2 / S1≥1, D1=a1*D,D2=(S2 / S1)*a2*D Among them, a1=1.15~1.3, a2=1.15~1.

3.

6. The water pump for a cleaning machine according to any one of claims 3 to 5, characterized in that: S2 / S1=1~1.

3.

7. The water pump for a cleaning machine according to claim 2, characterized in that: The distance between the impeller (2) and the first baffle (011) is h1, the distance between the impeller (2) and the second baffle (021) is h2, the area of ​​the entrance of the first flow channel (01) is S1, and the area of ​​the entrance of the second flow channel (02) is S2, then when S1=S2, h1=h2.

8. The water pump for a cleaning machine according to claim 2, characterized in that: The first partition tongue (011) and the second partition tongue (021) are symmetrically arranged in the circumferential direction of the pump housing (1).

9. The water pump for a cleaning machine according to claim 2, characterized in that: The volute corresponding to the pump housing (1) comprises a first volute segment (a) for pressurizing water entering the first flow channel (01) and a second volute segment (b) for pressurizing water entering the second flow channel (02); the first volute segment (a) and the second volute segment (b) are symmetrically arranged in the circumferential direction of the pump housing (1).

10. The water pump for a cleaning machine according to claim 2, characterized in that: The pump housing (1) has a disc-shaped body, and the inlets of the first flow channel (01) and the second flow channel (02) are symmetrically arranged in the circumferential direction of the body, but the spiral angles of the first flow channel (01) and the second flow channel (02) are different.

11. The water pump for a cleaning machine according to claim 1, characterized in that: The flow channel comprises a first flow channel (01), a second flow channel (02), and a third flow channel (03); a first partition tongue (011) is formed between the inlet of the first flow channel (01) and the pump chamber (10); a second partition tongue (021) is formed between the inlet of the second flow channel (02) and the pump chamber (10); and a third partition tongue (031) is formed between the inlet of the third flow channel (03) and the pump chamber (10).

12. The water pump for a cleaning machine according to claim 11, characterized in that: The distance between the impeller (2) and the first partition tongue (011) is h1, the distance between the impeller (2) and the second partition tongue (021) is h2, the distance between the impeller (2) and the third partition tongue (031) is h3, the area of ​​the entrance of the first flow channel (01) is S1, the area of ​​the entrance of the second flow channel (02) is S2, and the area of ​​the entrance of the third flow channel (03) is S3. h1=(a1-1)D / 2, h2=((S2 / S1)*a2-1)D / 2, h3=((S3 / S1)*a3-1)D / 2 Among them, a1=1.15~1.3, a2=1.15~1.3, a3=1.15~1.

3.

13. The water pump for a cleaning machine according to claim 11, characterized in that: The area of ​​the entrance of the first flow channel (01) is S1, the area of ​​the entrance of the second flow channel (02) is S2, and the area of ​​the entrance of the third flow channel (03) is S3. The base circle diameter of the entrance of the first flow channel (01) is D1, the base circle diameter of the entrance of the second flow channel (02) is D2, and the base circle diameter of the entrance of the third flow channel (03) is D3. D1=a1*D, D2=(S2 / S1)*a2*D, D3=(S3 / S1)*a3*D Among them, a1=1.15~1.3, a2=1.15~1.3, a3=1.15~1.

3.

14. The water pump for a cleaning machine according to claim 13, characterized in that: S2 / S1≥1, S3 / S2≥1, S3 / S2≥S2 / S1, S3 / S1=1~1.

3.

15. The water pump for a cleaning machine according to any one of claims 1 to 5 and 7 to 14, characterized in that: The impeller (2) is a centrifugal impeller.

16. A water pump for a cleaning machine, comprising a pump housing (1) and an impeller (2) arranged in the pump housing (1), characterized in that: The bottom of the pump housing (1) is provided with a water inlet (11), and the side of the pump housing (1) extends outward along a circumferential spiral to form at least two relatively independent flow channels, and a partition tongue is formed between the inlet of each flow channel and the pump chamber (10), and the distance between the impeller (2) and the partition tongue is h, where h=5-7.5 mm.

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 (012) extending upward to above the water return area (31) is provided at the end of the flow channel, 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 (012) 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 enclosed by a corner and its adjacent straight edge, and the water guide section (012) is located at the center of the triangular structure.

Images