Centrifugal water pump for cleaning machine and cleaning machine

Abstract

The centrifugal water pump for the cleaning machine comprises a volute and an impeller, the number of flow channels is two, the flow channels are symmetrically arranged in the circumferential direction of the volute, a first partition tongue is formed between an inlet of one flow channel and the side wall of the volute, and a second partition tongue is formed between an inlet of the other flow channel and the volute. The first baffle tongue and the second baffle tongue are symmetrically arranged about the center of the volute; the centrifugal impeller is provided with an odd number of blades. When the first baffle tongue corresponds to the outer end of any blade, the second baffle tongue corresponds to the area between the two adjacent blades, and due to the fact that the water flow pressure borne by the baffle tongues is small when the baffle tongues correspond to the ends of the blades and the water flow pressure borne by the baffle tongues is large when the baffle tongues correspond to fluid between the blades, the two baffle tongues are arranged in a peak staggering mode all the time. Due to the fact that the noise is a sound wave, the phases of the noise generated at the two separating tongues are just staggered by 0.5 period, resonance generated due to the fact that the phases of the noise at the two positions are the same is avoided, and vibration and noise of the water pump are effectively reduced.

Description

Technical Field

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

[0002] For a dishwasher with a larger volume, in order to achieve a better washing effect, at least two groups of spray arms arranged up and down are generally provided. When working, the washing pump delivers water to each spray arm for spraying up and down. After washing the dishes, the water that falls back gathers in the water cup at the bottom of the dishwasher. The washing pump delivers the falling water to each spray arm again, completing a water flow cycle.

[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. For example, the applicant's prior application CN202211216848.9 "An open water pump and cleaning machine" discloses a structure, which includes a pump casing, a cover plate, and an impeller. The pump casing has a water suction port at the bottom, a first water outlet at the top, and a second water outlet at the side. The cover plate is arranged in the pump casing and divides the inner cavity of the pump casing into an upper cavity and a lower cavity. The lower cavity is formed with a first flow channel and a second flow channel arranged relatively and used to draw water in both directions. The second water outlet is arranged in the lower cavity. The cover plate is provided with a notch at the edge thereof for connecting the second flow channel to the upper cavity, and the first water outlet is connected to the upper cavity; a first splitter blade and a second splitter blade extending vertically are arranged on the lower surface of the cover plate, the first splitter blade is arranged close to the outer wall of the first splitter portion, and the end portion thereof extends toward the water suction port along the extension trajectory of the splitter end, and the second splitter blade is arranged close to the outer wall of the second splitter portion, and the end portion thereof extends toward the water suction port along the extension trajectory of the splitter end.

[0004] The above scheme utilizes the cover plate to constrain the first flow channel and the second flow channel for diverting water in the pump casing, and the inner wall of the diverter blade under the cover plate and the other inner walls of the pump casing jointly constrain a fixed volute trajectory. Since the washing environment in the washing chamber is relatively complex, it will be affected by the properties of detergent powder and pollutants on the surface of the cleaned object. In order to achieve a good water pumping effect under different conditions, the speed of the water pump motor often needs to change with the washing environment. When the impeller speed is high, pulsation of the pressure water flow will be generated at the volute tongue. This pulsation will cause the water pump to vibrate violently and increase the noise, which will not only affect the performance of the water pump, but also seriously affect the user experience. Utility Model Content

[0005] The first technical problem to be solved by the utility model is to provide a centrifugal water pump for a cleaning machine which reduces noise by avoiding resonance in view of the current status of the prior art.

[0006] The second technical problem to be solved by the utility model is to provide a cleaning machine using the centrifugal 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 centrifugal water pump for a cleaning machine, comprising:

[0009] The volute is in the shape of a disk, with a water inlet at the bottom and a flow channel extending outward along a circumferential spiral at the side;

[0010] An impeller is rotatably disposed in the volute and is used to pump water out through the flow channel;

[0011] There are two flow channels and they are symmetrically arranged in the circumferential direction of the volute. A first partition tongue is formed between the inlet of one flow channel and the side wall of the volute, and a second partition tongue is formed between the inlet of the other flow channel and the volute. The first partition tongue and the second partition tongue are symmetrically arranged about the center of the volute. The impeller is a centrifugal impeller and includes an odd number of blades.

[0012] The utility model separates two centrally symmetrical flow channels by symmetrically arranged first and second partition tongues, and the impeller has an odd number of blades. When the first partition tongue corresponds to the outer end of any blade, the second partition tongue will correspond to the area between two adjacent blades. Since the water flow pressure on the partition tongue is smaller when the partition tongue corresponds to the end of the blade, and is larger when the partition tongue corresponds to the fluid between the blades, the utility model always arranges the two partition tongues in staggered peaks. Since noise is a sound wave, the noise phases generated at the two partition tongues are exactly staggered by 0.5 cycles, thus avoiding resonance caused by the same noise phase at the two locations, thereby effectively reducing the vibration and noise problems of the water pump.

[0013] In the utility model, the impeller includes an upper cover plate, a lower cover plate and blades, the upper cover plate and the lower cover plate are arranged at intervals up and down, the blades are arranged at intervals and radially between the upper cover plate and the lower cover plate, and a water suction port corresponding to the water inlet is opened in the central part of the lower cover plate. The centrifugal blades are used to better adapt to the water absorption effect of the volute.

[0014] Preferably, the two blades and the upper cover plate at the top and the lower cover plate at the bottom together enclose a water suction channel, and when the impeller rotates to the state where the first baffle tongue is arranged with the outer end of any blade, the second baffle tongue corresponds to the outer port of a water suction channel. When the first baffle tongue corresponds to the outer end of any blade, the second baffle tongue corresponds to the outer port of the water suction channel. Since the water flow pressure on the baffle tongue is smaller when the baffle tongue corresponds to the end of the blade, and the water flow pressure on the baffle tongue is larger when the baffle tongue corresponds to the outer port of the water suction channel, the two baffle tongues are always arranged at staggered peaks, and the noise phases generated at the two baffle tongues are exactly staggered by 0.5 cycles, thereby avoiding resonance caused by the same phase of the noise at the two locations and reducing noise.

[0015] Preferably, the top wall of the upper cover plate is also provided with back blades, the number of which is equal to the number of the blades and corresponds to the blades one by one on the upper cover plate. The provision of the back blades is conducive to balancing the circumferential and radial forces of the impeller, improving the rotation stability of the impeller, and further reducing noise.

[0016] Preferably, the number of the blades is 5 to 11. More preferably, the number of the blades is 7. For a cleaning machine using an open water pump, since the volume of the volute is limited, by limiting the number of blades, the noise of the water pump can be reduced while meeting the water pumping demand.

[0017] Preferably, the radius of the water inlet is R, the radius of the blade is r, R>r, and Rr≤0.7mm. The distance between the impeller and the first baffle is equal to the distance between the impeller and the second baffle, which is d, d>(Rr). The above structure is conducive to further reducing noise while taking into account the water-drawing performance.

[0018] Preferably, the flow channel includes a first part and a second part connected along the water flow direction, the first part decreases in width from the corresponding tongue to the outside, and the second part gradually increases in width from the end of the first part to the outside. This structure can provide rectification and buffering at the output of the volute water flow, further reduce noise, and reduce fluid energy loss.

[0019] A cleaning machine comprises a box body and a first spray arm and a second spray arm arranged in the box body, the bottom of the box body is provided with a concave return water area, and also includes the above-mentioned centrifugal water pump, the volute is arranged in the return water area and the water inlet is arranged downward, the first spray arm is arranged near the top of the return water area and is connected to a flow channel outlet of the volute through a pipe, and the second spray arm is arranged above the first spray arm and is connected to another flow channel outlet of the volute through a pipe.

[0020] Compared with the prior art, the advantages of the present invention are: the present invention separates two centrally symmetrical flow channels by symmetrically arranged first and second partition tongues, and the impeller has an odd number of blades. When the first partition tongue corresponds to the outer end of any blade, the second partition tongue will correspond to the area between two adjacent blades. Since the water flow pressure on the partition tongue is smaller when the partition tongue corresponds to the end of the blade, and is larger when the partition tongue corresponds to the fluid between the blades, the present invention always arranges the two partition tongues in staggered positions. Since noise is a sound wave, the noise phases generated at the two partition tongues are exactly staggered by 0.5 cycles, thus avoiding resonance caused by the same noise phase at the two locations, thereby effectively reducing the vibration and noise problems of the water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of a centrifugal water pump in 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 for Figure 1 Another cross-sectional view of . 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 centrifugal water pump for a cleaning machine in this embodiment includes a volute 1, an impeller 2, and a driving member. The volute 1 is disc-shaped, with a water inlet 11 at the bottom of the volute 1, and a flow channel extending outward along a circumferential spiral is provided on the side. The impeller 2 is a centrifugal impeller, which is rotatably arranged in the volute 1 and is used to pump water out through the flow channel. The driving member is a motor, which is arranged under the volute 1 and is used to drive the impeller 2 to rotate. The output shaft of the driving member passes through the water inlet 11 upward and is connected to the shaft at the center of the impeller 2.

[0027] In this embodiment, there are two flow channels 10 and they are symmetrically arranged in the circumferential direction of the volute 1. A first partition tongue 101 is formed between the inlet of one flow channel 10 and the side wall of the volute 1, and a second partition tongue 102 is formed between the inlet of the other flow channel 10 and the volute 1. The first partition tongue 101 and the second partition tongue 102 are symmetrically arranged about the center of the volute 1, and the impeller 2 has an odd number of blades 23.

[0028] Specifically, the impeller 2 includes an upper cover plate 21, a lower cover plate 22 and blades 23. The upper cover plate 21 and the lower cover plate 22 are arranged at intervals in the upper and lower directions. The blades 23 are arranged at intervals and radially between the upper cover plate 21 and the lower cover plate 22. The central part of the lower cover plate 22 is provided with a water suction port 221 arranged corresponding to the water inlet 11. The centrifugal blades are used to better adapt to the water absorption effect of the volute.

[0029] The two blades 23, the upper cover plate 21 at the top and the lower cover plate 22 at the bottom together enclose a water suction channel 24. When the impeller 2 rotates to the state where the first baffle tongue 101 is arranged with the outer end of any blade 23, the second baffle tongue 102 corresponds to the outer end of a water suction channel 24. When the first baffle tongue 101 corresponds to the outer end of any blade 23, the second baffle tongue 102 corresponds to the outer end of the water suction channel 24. Since the water flow pressure on the baffle tongue when it corresponds to the end of the blade 23 is smaller, and the water flow pressure on the baffle tongue when it corresponds to the outer end of the water suction channel 24 is larger, the two baffle tongues are always arranged at staggered peaks, and the noise phases generated at the two baffle tongues are exactly staggered by 0.5 cycles, thus avoiding resonance caused by the same phase of the noise at the two locations and reducing noise.

[0030] The top wall of the upper cover plate 21 is also provided with back blades 25, the number of which is equal to the number of blades 23 and corresponds to the blades 23 one by one on the upper cover plate 21. The provision of the back blades 25 is conducive to balancing the circumferential and radial forces of the impeller 2, improving the rotation stability of the impeller 2, and further reducing noise.

[0031] The number of blades 23 in this embodiment is 5 to 11, preferably 7. For a cleaning machine using an open water pump, since the volume of the volute is limited, by limiting the number of blades, the noise of the water pump can be reduced while meeting the water pumping demand.

[0032] In this embodiment, the radius of the water inlet 11 is R, the radius of the blade 23 is r, R>r, and Rr≤0.7mm. The distance between the impeller 2 and the first baffle 101 is equal to the distance between the impeller 2 and the second baffle 102, which is d, d>(Rr). The above structure is conducive to further reducing noise while taking into account the water-drawing performance.

[0033] The flow channel 10 includes a first part 01 and a second part 02 connected along the water flow direction. The first part 01 decreases in width from the corresponding tongue to the outside, and the second part 02 gradually increases in width from the end of the first part 01 to the outside. This structure can provide rectification and buffering at the water flow output of the volute 1, further reduce noise, and reduce fluid energy loss.

[0034] The cleaning machine of this embodiment includes a box body and a first spray arm and a second spray arm arranged in the box body. A concave return water area is arranged at the bottom of the box body, and it also includes the above-mentioned open water pump. The volute 1 is arranged in the return water area and the water inlet 11 is arranged downward. The first spray arm is arranged near the top of the return water area and is connected to a flow channel outlet of the volute 1 through a pipe. The second spray arm is arranged above the first spray arm and is connected to another flow channel outlet of the volute 1 through a pipe.

[0035] In this embodiment, two centrally symmetrical flow channels 10 are separated by symmetrically arranged first partition tongues 101 and second partition tongues 102, and the impeller has an odd number of blades 23. When the first partition tongue 101 corresponds to the outer end of any blade 23, the second partition tongue 102 will correspond to the area between two adjacent blades 23. Since the water flow pressure on the partition tongue is smaller when the partition tongue corresponds to the end of the blade 23, and the water flow pressure on the partition tongue is larger when the partition tongue corresponds to the fluid between the blades 23, in this embodiment, the two partition tongues are always arranged at staggered peaks. Since noise is a sound wave, the noise phases generated at the two partition tongues are exactly staggered by 0.5 cycles, which avoids resonance caused by the same noise phase at the two locations, thereby effectively reducing the vibration and noise problems of the water pump.

[0036] 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 centrifugal water pump for a cleaning machine, comprising: The volute (1) is in the shape of a disk, the bottom of the volute (1) is provided with a water inlet (11), and the side is provided with a flow channel (10) extending outward in a circumferential spiral; An impeller (2) is rotatably disposed in the volute (1) and is used to pump water out through the flow channel (10); The invention is characterized in that: the flow channels (10) are two and are symmetrically arranged in the circumferential direction of the volute (1); a first partition tongue (101) is formed between the inlet of one of the flow channels (10) and the side wall of the volute (1); a second partition tongue (102) is formed between the inlet of the other flow channel (10) and the volute (1); the first partition tongue (101) and the second partition tongue (102) are symmetrically arranged about the center of the volute (1); the impeller (2) is a centrifugal impeller (2) and includes an odd number of blades (23); The radius of the water inlet (11) is R, the radius of the blade (23) is r, R>r, and Rr≤0.7 mm.

2. The centrifugal water pump for a cleaning machine according to claim 1, characterized in that: The impeller (2) comprises an upper cover plate (21), a lower cover plate (22) and blades (23); the upper cover plate (21) and the lower cover plate (22) are arranged at intervals up and down; the blades (23) are arranged at intervals and radially 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 opened at the central portion of the lower cover plate (22).

3. The centrifugal water pump for a cleaning machine according to claim 2, characterized in that: The two blades (23) together with the upper cover plate (21) at the top and the lower cover plate (22) at the bottom form a water suction channel (24); when the impeller (2) rotates to a state where the first baffle tongue (101) is arranged with the outer end of any blade (23), the second baffle tongue (102) corresponds to an outer end of a water suction channel (24).

4. The centrifugal water pump for a cleaning machine according to claim 2, characterized in that: The top wall of the upper cover plate (21) is also provided with back blades (23), the number of which is equal to the number of the blades (23) and which correspond one to another on the upper cover plate (21).

5. The centrifugal water pump for a cleaning machine according to any one of claims 1 to 4, characterized in that: The number of the blades (23) is 5 to 11.

6. The centrifugal water pump for a cleaning machine according to claim 5, characterized in that: The number of the blades (23) is 7.

7. A centrifugal water pump for a cleaning machine according to any one of claims 1 to 4, characterized in that: The distance between the impeller (2) and the first partition tongue (101) is equal to the distance between the impeller (2) and the second partition tongue (102), and the distance is d, d>(Rr).

8. A centrifugal water pump for a cleaning machine according to any one of claims 1 to 4, characterized in that: The flow channel (10) comprises a first part (01) and a second part (02) connected along the water flow direction, wherein the width of the first part (01) decreases from the corresponding baffle to the outside, and the width of the second part (02) gradually increases from the end of the first part (01) to the outside.

9. A cleaning machine, comprising a box body and a first spray arm and a second spray arm arranged in the box body, wherein a concave water return area is arranged at the bottom of the box body, characterized in that: It also includes a centrifugal water pump as described in any one of claims 1 to 8, wherein the volute (1) is arranged in the return water area and the water inlet (11) is arranged downward, the first spray arm is arranged near the top of the return water area and is connected to an outlet of a flow channel (10) of the volute (1) through a pipeline, and the second spray arm is arranged above the first spray arm and is connected to an outlet of another flow channel (10) of the volute (1) through a pipeline.

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