Water pump for cleaning machine and cleaning machine

Abstract

The water pump comprises a pump shell and an impeller rotatably arranged in the pump shell, a water inlet is formed in the bottom of the pump shell, and an adjusting assembly capable of adjusting the size of the water inlet is arranged at the bottom of the pump shell. The adjusting assembly comprises a frame edge which expands along with increasing of water flow and contracts along with decreasing of the water flow, and the frame edge is arranged around the edge of the water inlet. The adjusting assembly capable of adjusting the size of the water inlet is arranged at the bottom of the pump shell, the adjusting assembly is mainly achieved through the frame edge which expands along with increasing of water flow and contracts along with decreasing of the water flow, when the rotating speed of the impeller is large, the frame edge expands along with increasing of the water flow, so that the water inlet area is increased, and when the rotating speed of the impeller is small, the frame edge contracts. The rims shrink along with the reduction of the water flow, so that the water inlet area is reduced, the water inlet area is matched with the water flow, the water inlet flow speed is controlled within a relatively stable range, and the water pumping performance is improved.

Description

Technical Field

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

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

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

[0004] Since the above-mentioned water pump is an open water pump, it is directly installed in the return water area. In the cleaning state, the water inlet at the bottom of the water pump is below the water level. During the pumping process, as the washing environment changes, the impeller speed may change at the same power. When the impeller speed is low, the water flow rate is small; when the speed is high, the water flow rate is large. Since the area of ​​the water pump inlet remains unchanged, when the water flow rate is different, the water flow velocity at the water inlet of the pump casing will be very different. A large difference in inlet flow velocity will cause unstable pump performance and affect the water pumping performance. Utility Model Content

[0005] The first technical problem to be solved by the utility model is to provide a water pump for a cleaning machine which can automatically adjust the water inlet area to adapt to the water flow rate and improve the water pumping performance 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 above-mentioned water pump in view of the current status of the prior art.

[0007] The technical solution adopted by the utility model to solve at least one of the above technical problems is:

[0008] A water pump for a cleaning machine comprises a pump casing and an impeller rotatably arranged in the pump casing, a water inlet is opened at the bottom of the pump casing, an adjusting component capable of adjusting the size of the water inlet is arranged at the bottom of the pump casing, the adjusting component comprises a frame edge which expands as the water flow increases and contracts as the water flow decreases, and the frame edge is arranged around the edge of the water inlet.

[0009] The utility model provides an adjusting component capable of adjusting the size of the water inlet at the bottom of the pump casing. The adjusting component is mainly realized by a frame edge which expands as the water flow increases and contracts as the water flow decreases. When the impeller speed is relatively high, the frame edge expands as the water flow increases, thereby increasing the water inlet area. When the impeller speed is relatively low, the frame edge contracts as the water flow decreases, thereby reducing the water inlet area. Thus, the water inlet area is adapted to the water flow, and the water inlet flow rate is controlled within a relatively stable range, thereby improving the water pumping performance.

[0010] Preferably, the frame edge includes a first edge, a second edge, a third edge, and a fourth edge that can enclose a mouth-shaped structure. The frame edge partially covers the edge of the water inlet during its contraction process, and the frame edge partially exposes the edge of the water inlet during its expansion process. The first edge, the second edge, the third edge, and the fourth edge have a certain width, such as a width of 5 to 20 mm, which can partially cover the edge of the water inlet during contraction to reduce the area of ​​the water inlet. The above structure makes it convenient to achieve the contraction and expansion of the entire frame edge by simply moving each edge, thereby adjusting the area of ​​the water inlet.

[0011] Preferably, the first end of the first side abuts against the inner side of the second side arranged perpendicularly thereto and is arranged close to the first end of the second side, the second end of the second side abuts against the inner side of the third side arranged parallel to the first side and is arranged close to the first end of the third side, the second end of the third side abuts against the inner side of the fourth side arranged parallel to the second side and is arranged close to the first end of the second side, and the second end of the fourth side abuts against the inner side of the first side and is arranged close to the second end of the first side.

[0012] Preferably, the adjustment assembly also includes a driving structure arranged on the outside of the frame edge and making the frame edge keep the corners tightly overlapped during the relative expansion and contraction process. Further preferably, the outside of the first edge is provided with a first limit arm inclined from the first edge outward and toward the second edge, and the first limit arm can be reciprocated along its length direction and constrained at the bottom of the pump housing; the outside of the second edge is provided with a second limit arm inclined from the second edge outward and toward the third edge, and the second limit arm can be reciprocated along its length direction and constrained at the bottom of the pump housing; the outside of the third edge is provided with a third limit arm inclined from the third edge outward and toward the fourth edge, and the third limit arm can be reciprocated along its length direction and constrained at the bottom of the pump housing; the outside of the fourth edge is provided with a fourth limit arm inclined from the fourth edge outward and toward the first edge, and the fourth limit arm can be reciprocated along its length direction and constrained at the bottom of the pump housing. The above structure is adopted so that the frame edge can maintain a complete mouth-shaped structure during the expansion and contraction process, thereby reducing the influence of the water flow state at the water inlet.

[0013] In order to facilitate the directional movement of each side, the bottom wall of the pump housing is provided with limiting grooves corresponding to the first limiting arm, the second limiting arm, the third limiting arm, and the fourth limiting arm, and each limiting arm can be constrained in the corresponding limiting groove for reciprocating sliding. The limiting groove is also provided with a first elastic member elastically compressed between the first end wall of the limiting groove and the corresponding limiting arm, and a second elastic member elastically compressed between the second end wall of the limiting groove and the corresponding limiting arm. The first elastic member, the second elastic member, the limiting groove, and the corresponding limiting arm together constitute the driving structure.

[0014] Preferably, the cross section of the limit groove is formed into a trapezoidal structure with a small upper end and a large lower end, and correspondingly, each limit arm is provided with a limit block with a cross section matching the limit groove of the trapezoidal structure. The above structure is conducive to improving the reliability and stability of the movable connection between the frame edge and the pump housing.

[0015] Preferably, the impeller comprises an upper cover plate, a lower cover plate and a water-drawing blade located between the upper cover plate and the lower cover plate, and a water suction port corresponding to the water inlet is provided in the central part of the lower cover plate, and the diameter of the water suction port is smaller than the diameter of the water inlet. The above structure is adopted to ensure that the impeller always has a good water-drawing effect as the water inlet area of ​​the water inlet is adjusted.

[0016] 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.

[0017] Compared with the prior art, the utility model has the following advantages: the utility model is provided with an adjusting component capable of adjusting the size of the water inlet at the bottom of the pump casing, and the adjusting component is mainly realized by a frame edge which expands as the water flow rate increases and contracts as the water flow rate decreases. When the impeller speed is relatively high, the frame edge expands as the water flow rate increases, thereby increasing the water inlet area; when the impeller speed is relatively low, the frame edge contracts as the water flow rate decreases, thereby reducing the water inlet area, thereby matching the water inlet area with the water flow rate, and controlling the water inlet flow rate within a relatively stable range, thereby improving the water pumping performance. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 for Figure 1 Schematic diagram of the bottom structure;

[0020] Figure 3 for Figure 2 Exploded diagram of

[0021] Figure 4 for Figure 1 Exploded diagram of

[0022] Figure 5 It is a cross-sectional view of a water pump according to an embodiment of the utility model. DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] like Figures 1 to 5 As shown, the water pump for a cleaning machine in this embodiment includes a pump casing 1 and an impeller 2 rotatably disposed in the pump casing 1. The pump casing 1 is disc-shaped, and a circular water inlet 11 is provided in the center of the bottom wall of the pump casing 1. A water outlet 12 is formed on the side wall of the pump casing 1 through a flow channel extending outward in a spiral. The impeller 2 is a centrifugal impeller rotatably disposed in the pump casing 1.

[0025] In this embodiment, an adjusting component 3 capable of adjusting the size of the water inlet 11 is provided at the bottom of the pump housing 1. The adjusting component 3 includes a frame edge 31 which expands as the water flow increases and contracts as the water flow decreases. The frame edge 31 is arranged around the edge of the water inlet 11.

[0026] The frame edge 31 includes a first edge 311, a second edge 312, a third edge 313, and a fourth edge 314 that can enclose a mouth-shaped structure. The frame edge 31 covers the edge of the water inlet 11 as it contracts, and exposes the edge of the water inlet 11 as it expands. The first edge 311, the second edge 312, the third edge 313, and the fourth edge 314 have a certain width, such as a width of 5 to 20 mm, and can cover the edge of the water inlet 11 when contracted to reduce the area of ​​the water inlet 11. The above structure facilitates the contraction and expansion of the entire frame edge by simply moving each edge, thereby adjusting the area of ​​the water inlet.

[0027] The first end of the first edge 311 abuts against the inner side of the second edge 312 arranged perpendicularly thereto and is arranged close to the first end of the second edge 312, the second end of the second edge 312 abuts against the inner side of the third edge 313 arranged parallel to the first edge 311 and is arranged close to the first end of the third edge 313, the second end of the third edge 313 abuts against the inner side of the fourth edge 314 arranged parallel to the second edge 312 and is arranged close to the first end of the second edge 312, and the second end of the fourth edge 314 abuts against the inner side of the first edge 311 and is arranged close to the second end of the first edge 311.

[0028] The adjustment assembly 3 further includes a driving structure 32 which is arranged on the outer side of the frame edge 31 and enables the frame edge 31 to maintain tight overlap at the corners during the relative expansion and contraction process. A first limiting arm 310 is arranged on the outer side of the first side 311, which is inclined outward from the first side 311 and toward the second side 312, and the first limiting arm 310 can be constrained at the bottom of the pump casing 1 for reciprocating movement along its length direction; a second limiting arm 320 is arranged on the outer side of the second side 312, which is inclined outward from the second side 312 and toward the third side 313, and the second limiting arm 320 can be constrained at the bottom of the pump casing 1 for reciprocating movement along its length direction; a third limiting arm 330 is arranged on the outer side of the third side 313, which is inclined outward from the third side 313 and toward the fourth side 314, and the third limiting arm 330 can be constrained at the bottom of the pump casing 1 for reciprocating movement along its length direction; a fourth limiting arm 340 is arranged on the outer side of the fourth side 314, which is inclined outward from the fourth side 314 and toward the first side 311, and the fourth limiting arm 340 can be constrained at the bottom of the pump casing 1 for reciprocating movement along its length direction. The above structure is adopted to enable the frame edge 31 to maintain a complete U-shaped structure during the expansion and contraction process, thereby reducing the influence of the water flow state at the water inlet 11.

[0029] In order to facilitate the directional movement of each side, the bottom wall of the pump housing 1 is provided with limiting grooves 30 corresponding to the first limiting arm 310, the second limiting arm 320, the third limiting arm 330, and the fourth limiting arm 340, respectively, and each limiting arm can be constrained to slide back and forth in the corresponding limiting groove 30. The limiting groove 30 is also provided with a first elastic member 01 elastically compressed between the first end wall of the limiting groove 30 and the corresponding limiting arm, and a second elastic member 02 elastically compressed between the second end wall of the limiting groove 30 and the corresponding limiting arm. The first elastic member 01, the second elastic member 02, the limiting groove 30 and the corresponding limiting arm together constitute the driving structure 32.

[0030] The cross section of the above-mentioned limit groove 30 is formed into a trapezoidal structure with a small upper end and a large lower end. Correspondingly, each limit arm is provided with a limit block 300 whose cross section matches the limit groove 30 of the trapezoidal structure. The above-mentioned structure is conducive to improving the reliability and stability of the movable connection between the frame edge 31 and the pump housing 1.

[0031] In this embodiment, the impeller 2 includes an upper cover plate 21, a lower cover plate 22, and a water-drawing blade 23 located between the upper cover plate 21 and the lower cover plate 22. A water suction port 221 corresponding to the water inlet 11 is provided at the central portion of the lower cover plate 22, and the diameter of the water suction port 221 is smaller than the diameter of the water inlet 11. The above structure is adopted to ensure that the impeller 2 always has a good water-drawing effect as the water inlet area of ​​the water inlet 11 is adjusted.

[0032] The cleaning machine of this embodiment includes a box body, a concave water return area is arranged at the bottom of the box body, and the water pump is arranged in the water return area. A motor can be arranged at the outer bottom of the box body, and the output shaft of the motor passes through the bottom wall of the box body upward and is connected to the impeller.

[0033] In this embodiment, an adjusting component 3 capable of adjusting the size of the water inlet 11 is arranged at the bottom of the pump housing 1. The adjusting component 3 is mainly realized by a frame edge 31 that expands as the water flow rate increases and contracts as the water flow rate decreases. When the impeller 2 rotates at a high speed, the frame edge 31 expands as the water flow rate increases, thereby increasing the water inlet area. When the impeller 2 rotates at a low speed, the frame edge 31 contracts as the water flow rate decreases, thereby reducing the water inlet area, thereby matching the water inlet area with the water flow rate and controlling the water inlet flow rate within a relatively stable range to improve the water pumping performance.

[0034] 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) rotatably arranged in the pump housing (1), wherein a water inlet (11) is provided at the bottom of the pump housing (1), and characterized in that: The bottom of the pump housing (1) is provided with an adjustment component (3) capable of adjusting the size of the water inlet (11); the adjustment component (3) comprises a frame edge (31) which expands as the water flow rate increases and contracts as the water flow rate decreases; the frame edge (31) is arranged around the edge of the water inlet (11).

2. The water pump for a cleaning machine according to claim 1, characterized in that: The frame edge (31) comprises a first edge (311), a second edge (312), a third edge (313), and a fourth edge (314) that can enclose a U-shaped structure. The frame edge (31) covers the edge portion of the water inlet (11) during its contraction process, and exposes the edge portion of the water inlet (11) during its expansion process.

3. The water pump for a cleaning machine according to claim 2, characterized in that: The first end of the first side (311) abuts against the inner side of the second side (312) arranged perpendicularly thereto and is arranged close to the first end of the second side (312); the second end of the second side (312) abuts against the inner side of the third side (313) arranged parallel to the first side (311) and is arranged close to the first end of the third side (313); the second end of the third side (313) abuts against the inner side of the fourth side (314) arranged parallel to the second side (312) and is arranged close to the first end of the second side (312); the second end of the fourth side (314) abuts against the inner side of the first side (311) and is arranged close to the second end of the first side (311).

4. The water pump for a cleaning machine according to claim 3, characterized in that: The adjustment component (3) also includes a driving structure (32) which is arranged on the outside of the frame edge (31) and enables the frame edge (31) to maintain tight overlap at the corners during the relative expansion and contraction process.

5. The water pump for a cleaning machine according to claim 4, characterized in that: A first limiting arm (310) is arranged on the outer side of the first side (311) and is inclined outwardly from the first side (311) and toward the second side (312); the first limiting arm (310) can be constrained at the bottom of the pump housing (1) by reciprocating movement along its length direction; a second limiting arm (320) is arranged on the outer side of the second side (312) and is inclined outwardly from the second side (312) and toward the third side (313); the second limiting arm (320) can be constrained at the bottom of the pump housing (1) by reciprocating movement along its length direction; A third limiting arm (330) is arranged on the outer side of the third side (313) and is inclined outwardly from the third side (313) and toward the fourth side (314); the third limiting arm (330) can be constrained at the bottom of the pump housing (1) by reciprocating movement along its length direction; and a fourth limiting arm (340) is arranged on the outer side of the fourth side (314) and is inclined outwardly from the fourth side (314) and toward the first side (311); the fourth limiting arm (340) can be constrained at the bottom of the pump housing (1) by reciprocating movement along its length direction.

6. The water pump for a cleaning machine according to claim 5, characterized in that: The bottom wall of the pump housing (1) is provided with limiting grooves (30) corresponding to the first limiting arm (310), the second limiting arm (320), the third limiting arm (330), and the fourth limiting arm (340), respectively, and each limiting arm can be constrained to slide back and forth in the corresponding limiting groove (30).

7. The water pump for a cleaning machine according to claim 6, characterized in that: The limiting groove (30) is also provided with a first elastic member (01) elastically compressed between a first end wall of the limiting groove (30) and a corresponding limiting arm, and a second elastic member (02) elastically compressed between a second end wall of the limiting groove (30) and a corresponding limiting arm. The first elastic member (01), the second elastic member (02), the limiting groove (30) and the corresponding limiting arm together constitute the driving structure (32).

8. The water pump for a cleaning machine according to claim 6, characterized in that: The cross section of the limiting groove (30) is formed into a trapezoidal structure with a small upper end and a large lower end. Correspondingly, each limiting arm is provided with a limiting block (300) having a cross section that matches the limiting groove (30) of the trapezoidal structure for limiting.

9. The water pump for a cleaning machine according to any one of claims 1 to 8, characterized in that: The impeller (2) comprises an upper cover plate (21), a lower cover plate (22) and a water-drawing blade (23) located between the upper cover plate (21) and the lower cover plate (22); a water suction port (221) arranged corresponding to the water inlet (11) is provided at the central portion of the lower cover plate (22); and the diameter of the water suction port (221) is smaller than the diameter of the water inlet (11).

10. A cleaning machine, comprising a box, the bottom of which is provided with a concave water return area, characterized in that: It also includes the water pump according to any one of claims 1 to 9, which is arranged in the return water area.

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