Water pump for cleaning machine and cleaning machine

Abstract

According to the water pump for the cleaning machine and the cleaning machine, the partial area, corresponding to the center of an impeller, of the top wall of a pump shell is made of a soft rubber sheet, and the soft rubber sheet has elasticity and can be subjected to self-adaptive deformation under pressure; when the cleaning condition requires low-power operation of the water pump, the axial force formed by the pressure difference between the front cover plate and the rear cover plate of the impeller of the water pump is relatively small, the negative pressure between the impeller and the inner top wall of the pump shell is small, and the soft rubber sheet slightly deforms downwards, so that the axial force of the water pump is balanced, the volume loss of the water pump is eliminated, the vibration noise is reduced, and the operation efficiency is improved; when the cleaning condition requires high-power operation of the water pump, the axial force formed by the pressure difference between the front cover plate and the rear cover plate of the impeller of the water pump is relatively high, the negative pressure between the impeller and the inner top wall of the pump shell is increased, and the soft rubber sheet continuously deforms downwards to reduce the space between the impeller and the inner top wall of the pump shell, so that the axial force of the water pump is balanced to the maximum extent; volume loss of the water pump is eliminated, vibration noise is reduced, and operation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of dishwashers, and specifically refers to a water pump for a cleaning machine and a cleaning machine. Background Art

[0002] With the improvement of people's living standards, dishwashers have gradually become common equipment in the kitchen. The water pump is an essential component in a dishwasher, and its performance directly affects the quality of the cleaning effect.

[0003] The applicant's prior patent ZL 202222653782.1, "An impeller structure and a water pump and a cleaning machine applying the impeller structure", discloses a structure in which the impeller structure includes an upper cover plate, a lower cover plate and blades. A back vane extending radially is arranged at the top of the upper cover plate. An outlet communicating with the water inlet through a water guiding channel is formed between the edge of the upper cover plate and the edge of the lower cover plate. The impeller is rotatably arranged in the pump housing. A water suction port is opened at the bottom of the pump housing, a first outlet is opened at the top, and a second outlet is opened at the side.

[0004] In the above water pump, a back vane is arranged at the top of the upper cover plate. The back vane cooperates with the inner top wall of the pump housing to balance the axial force to a certain extent and reduce vibration and noise. However, under different working conditions, as the operating power of the water pump changes, the distance between the inner top wall of the pump housing and the top of the impeller remains unchanged, but the generated pressure changes. This results in the back vane being unable to fully and effectively balance the axial force, and vibration and noise of the water pump still exist. In addition, there is also a certain amount of loss between the top of the impeller and the inner top wall of the water pump, which affects the operating efficiency of the water pump. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a water pump for a cleaning machine that can automatically balance the axial force according to the change of working conditions, thereby reducing vibration and noise, in view of the current situation of the prior art.

[0006] The second technical problem to be solved by the present invention is to provide a water pump for a cleaning machine that can automatically compensate for the volumetric loss according to the change of working conditions, thereby improving the operating efficiency, in view of the current situation of the prior art.

[0007] The third technical problem to be solved by the present invention is to provide a cleaning machine applying the above water pump, in view of the current situation of the prior art.

[0008] The technical solution adopted by the present invention to solve at least one of the above technical problems is as follows:

[0009] A water pump for a cleaning machine, comprising a pump housing and an impeller. The impeller is rotatably arranged in the pump housing. The bottom of the pump housing is provided with a water inlet, and the side is provided with a water outlet. The top wall of the pump housing is made of a deformable soft film material at the position corresponding to the center of the impeller. The soft film material deforms and stretches downward as the negative pressure in the area above the impeller increases, thereby changing the distance between the top wall of the pump housing and the top of the impeller, and deforms and resets upward as the negative pressure in the area above the impeller decreases.

[0010] Preferably, the impeller extends downward in a concave shape from the center of its top to form a shaft of the impeller. The inside of the shaft is hollow to form a concave cavity, and the soft film material is arranged corresponding to the concave cavity. Preferably, the soft film material deforms and protrudes into the concave cavity as the negative pressure in the area above the impeller increases. With the above structure, on the one hand, it is convenient to connect the concave cavity with the motor shaft extending from below the impeller, and the concave cavity can provide space for the soft film material to deform and protrude downward, allowing the soft film material to deform to a greater extent to better eliminate volume loss and balance the axial force of the water pump.

[0011] Preferably, the upper surface of the impeller and the concave cavity are smoothly connected through an arc structure. With such a structure, the water flow energy loss can be reduced.

[0012] Preferably, the upper surface of the impeller is provided with back blades distributed radially, and the inner ends of the back blades extend to the edge of the concave cavity. The back blades themselves can cooperate with the inner top wall of the pump housing to balance the axial force of the water pump. In the present invention, the back blades surrounding the soft film material can cooperate with the deformation of the soft film material to better balance the axial force of the water pump.

[0013] Preferably, the top of the pump housing is provided with a top cover detachably connected thereto. The top wall of the pump housing is provided with an opening corresponding to the impeller. The top cover is installed at the opening and covers the opening. The lower surface of the top cover constitutes a part of the inner top wall of the pump housing, and the soft film material is arranged on the top cover. Preferably, the top cover is made of hard plastic, and the soft film material is arranged in the middle of the top cover and integrally formed with it. With the above structure, it is convenient to install the soft film material on the pump housing and convenient for production and manufacturing.

[0014] Preferably, a notch for installing the soft film material is opened in the middle of the top cover, and the soft film material is injection-molded and welded together with the edge of the notch. With such a connection method, the production is convenient and the structural reliability is good.

[0015] Preferably, a buffer cavity that can surround the soft film material is provided above the top cover, and the top cover is provided with a diversion hole for draining the accumulated water in the buffer cavity into the pump housing. The buffer cavity can provide buffering for the deformation and reset of the soft film material to improve its operation stability.

[0016] Preferably, in the state after production is completed, the soft film material is slightly arched upward from the edge towards the center thereof, and there are a plurality of the diversion holes which are arranged at intervals around the periphery of the soft film material. With such a structure, it is beneficial to guide the accumulated water in the buffer cavity to the pump housing for discharge.

[0017] For the convenience of installation and assembly, an installation cover for restraining the top cover on the pump housing is provided at the top of the pump housing. The top cover is restrained under the installation cover. A first fitting set extending upward from the opening edge is provided on the top wall of the pump housing, and the installation cover is detachably locked on the first fitting set.

[0018] Preferably, a second fitting set extending downward is provided at the edge of the installation cover, and a third fitting set extending downward is provided on the lower surface of the installation cover near the second fitting set. A clamping groove for clamping the first fitting set therein is formed between the second fitting set and the third fitting set, and a sealing ring which is elastically pressed against the third fitting set and the first fitting set respectively is further provided in the clamping groove. This structure is beneficial to improving the sealing performance of the top of the pump housing.

[0019] Preferably, a fourth fitting set extending upward is provided on the upper surface of the top cover. The fourth fitting set is inserted into the third fitting set and is tightly sealed with it. The buffer cavity is jointly enclosed by the upper surface of the top cover, the fourth fitting set and the lower surface of the installation cover. This structure is beneficial to improving the sealing performance of the buffer cavity and avoiding pressure loss of the pump housing through the buffer cavity.

[0020] A cleaning machine includes a box body and a spray arm. A concave water return area is provided at the bottom of the box body, and a filter plate covers the top of the water return area. The spray arm is arranged above the filter plate. The cleaning machine further includes the above-mentioned water pump. The pump housing is arranged in the water return area. There is a water absorption gap between the water absorption port at the bottom of the pump housing and the bottom of the water return area. The spray arm is communicated with the water outlet of the pump housing.

[0021] Preferably, the water outlet includes a first water outlet and a second water outlet. The spray arm includes a first spray arm and a second spray arm. The pump housing bends upward from its first water outlet and extends at least to the filter plate and is rotatably connected to the first spray arm. The second spray arm is arranged in the upper middle part of the box body and is communicated with the second water outlet through a water delivery pipe.

[0022] Compared with the prior art, the advantages of the present invention are as follows: In the present invention, a partial area of the top wall of the pump casing corresponding to the center of the impeller is made of a soft film material. The soft film material has elasticity and can deform adaptively under pressure. When the cleaning condition requires the water pump to operate at low power, the axial force formed by the pressure difference between the front and rear covers of the water pump impeller is relatively small. At this time, the negative pressure between the impeller and the inner top wall of the pump casing is relatively small, and the soft film material deforms slightly downward, thereby balancing the axial force of the water pump, eliminating the volumetric loss of the water pump, reducing vibration and noise, and improving the operating efficiency. When the cleaning condition requires the water pump to operate at high power, the axial force formed by the pressure difference between the front and rear covers of the water pump impeller is relatively high. At this time, the negative pressure between the impeller and the inner top wall of the pump casing increases, and the soft film material continues to deform downward to reduce the space between the impeller and the inner top wall of the pump casing, thereby maximizing the balance of the axial force of the water pump, eliminating the volumetric loss of the water pump, reducing vibration and noise, and improving the operating efficiency. Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the water pump according to an embodiment of the present invention;

[0024] Figure 2 is Figure 1 the bottom structural diagram of;

[0025] Figure 3 is Figure 1 the sectional view of (in the non-use state);

[0026] Figure 4 is Figure 1 the sectional view of (in the low-power state of the water pump);

[0027] Figure 5 is Figure 1 the sectional view of (in the high-power state of the water pump). Detailed Embodiment

[0028] The present invention will be further described in detail below in conjunction with the embodiments of the drawings.

[0029] The water pump of this embodiment for the cleaning machine is an open water pump directly arranged in the washing cavity of the cleaning machine, and this open water pump adopts a centrifugal water pump structure.

[0030] As Figures 1 to 5 shown, the water pump of this embodiment includes a pump casing 1 and an impeller 2. The impeller 2 is rotatably arranged in the pump casing 1. The bottom of the pump casing 1 is provided with a water inlet 11, and the side is provided with a water outlet. The top wall of the pump casing 1 at the position corresponding to the center of the impeller 2 is made of a deformable soft film material 3. The soft film material 3 deforms and stretches downward as the negative pressure in the area above the impeller 2 increases, thereby changing the distance between the top wall of the pump casing 1 and the top of the impeller 2, and deforms and resets upward as the negative pressure in the area above the impeller 2 decreases.

[0031] The impeller 2 extends downward and is recessed from the center of its top to form a shaft 21 of the impeller 2. The inside of the shaft 21 is hollow to form a cavity 22, and the soft film material 3 is arranged corresponding to the cavity 22. The soft film material 3 deforms and protrudes into the cavity 22 as the negative pressure in the area above the impeller 2 increases. With the above structure, on the one hand, it is convenient to connect the cavity 22 with the motor shaft 21 extending from below the impeller 2, and the cavity 22 can provide space for the soft film material 3 to deform and protrude downward, allowing the soft film material 3 to deform to a greater extent to better eliminate volumetric losses and balance the axial force of the water pump shaft 21.

[0032] The upper surface of the impeller 2 and the cavity 22 are smoothly connected by an arc structure. With such a structure, the energy loss of the water flow is reduced.

[0033] The upper surface of the impeller 2 is provided with back vanes 23 distributed radially, and the inner ends of the back vanes 23 extend to the edge of the cavity 22. The back vanes 23 themselves can cooperate with the inner top wall of the pump casing 1 to balance the axial force of the water pump shaft 21. In this embodiment, the back vanes 23 surrounding the soft film material can cooperate with the deformation of the soft film material 3 to better balance the axial force of the water pump shaft 21.

[0034] The top of the pump casing 1 is provided with a top cover 4 detachably connected thereto. An opening corresponding to the impeller 2 is opened on the top wall of the pump casing 1. The top cover 4 is installed at the opening and covers the opening. The lower surface of the top cover 4 constitutes a part of the inner top wall of the pump casing 1, and the soft film material is provided on the top cover 4. The top cover 4 is made of hard plastic, and the soft film material 3 is provided in the middle of the top cover 4 and integrally formed therewith. With the above structure, it is convenient to install the soft film material 3 on the pump casing 1 and convenient for production and manufacturing.

[0035] A notch 41 for installing the soft film material 3 is opened in the middle of the top cover 4, and the soft film material 3 and the edge of the notch 41 are welded together by injection molding. With such a connection method, the production is convenient and the structural reliability is good.

[0036] A buffer cavity 100 that can surround the soft film material 3 is provided above the top cover 4. The top cover 4 is provided with a diversion hole 42 for draining the accumulated water in the buffer cavity 100 into the pump casing 1. The buffer cavity 100 can provide buffering for the deformation and reset of the soft film material 3 to improve its operating stability.

[0037] In the state after production, the soft film material 3 arches slightly upward from the edge to the center, and there are multiple diversion holes 42 arranged at intervals around the periphery of the soft film material 3. With such a structure, it is beneficial to guide the accumulated water in the buffer cavity 100 into the pump casing 1 for drainage.

[0038] For the convenience of installation and assembly, an installation cover 5 for constraining the top cover 4 on the pump housing 1 is provided at the top of the pump housing 1. The top cover 4 is constrained under the installation cover 5. A first fitting set 12 extending upward from the opening edge is provided on the top wall of the pump housing 1, and the installation cover 5 is detachably locked on the first fitting set 12.

[0039] A second fitting set 51 extending downward is provided at the edge of the installation cover 5. The second fitting set 51 surrounds the outside of the first fitting set 12 and is locked by a buckle. A third fitting set 52 extending downward is provided on the lower surface of the installation cover 5 near the second fitting set 51. A clamping groove 50 for clamping the first fitting set 51 therein is formed between the second fitting set 51 and the third fitting set 52. A sealing ring 53 elastically pressed against the third fitting set 52 and the first fitting set 51 respectively is further provided in the clamping groove 50. This structure is beneficial to improving the sealing performance of the top of the pump housing 1.

[0040] A fourth fitting set 43 extending upward is provided on the upper surface of the top cover 4. The fourth fitting set 43 is inserted into the third fitting set 52 and is tightly sealed with it. A buffer cavity 100 is jointly enclosed by the upper surface of the top cover 4, the fourth fitting set 43, and the lower surface of the installation cover 5. This structure is beneficial to improving the sealing performance of the buffer cavity 100 and avoiding pressure loss of the pump housing 1 through the buffer cavity 100.

[0041] In this embodiment, a partial area of the top wall of the pump housing 1 corresponding to the center of the impeller 2 is made of a soft rubber sheet 3. The soft rubber sheet 3 has elasticity and can adaptively deform under pressure. When the cleaning condition requires the water pump to operate at a low power, the axial force formed by the pressure difference between the front and rear covers of the water pump impeller 2 is relatively small. At this time, the negative pressure between the impeller 2 and the inner top wall of the pump housing 1 is relatively small, and the soft rubber sheet 3 deforms slightly downward, thereby balancing the axial force of the water pump, eliminating the volumetric loss of the water pump, reducing vibration and noise, and improving the operating efficiency. When the cleaning condition requires the water pump to operate at a high power, the axial force formed by the pressure difference between the front and rear covers of the water pump impeller 2 is relatively high. At this time, the negative pressure between the impeller 2 and the inner top wall of the pump housing 1 increases, and the soft rubber sheet 3 continues to deform downward to reduce the space between the impeller 2 and the inner top wall of the pump housing 1, thereby maximizing the balance of the axial force of the water pump, eliminating the volumetric loss of the water pump, reducing vibration and noise, and improving the operating efficiency.

[0042] The cleaning machine of this embodiment includes a box body and a spray arm. A concave water return area is provided at the bottom of the box body, and a filter plate covers the top of the water return area. The spray arm is arranged above the filter plate. It also includes the above-mentioned water pump, and the pump housing 1 is arranged in the water return area. There is a water suction gap between the water suction port at the bottom of the pump housing 1 and the bottom of the water return area. The spray arm is communicated with the water outlet of the pump housing 1. The water outlet includes a first water outlet 131 and a second water outlet 132. The spray arm includes a first spray arm and a second spray arm. The pump housing 1 bends upward from its first water outlet and extends at least to the filter plate and is rotatably connected to the first spray arm. The second spray arm is arranged in the upper middle part of the box body and is communicated with the second water outlet through a water supply pipe.

[0043] In the description and claims of the present invention, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention. However, these terms are used here only for the purpose of convenient description and are determined based on the exemplary orientations shown in the drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions should only be regarded as illustrative and not as restrictive. For example, "upper" and "lower" are not necessarily limited to the 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), wherein the impeller (2) is rotatably disposed in the pump housing (1), and the pump housing (1) is provided with a water inlet (11) at the bottom and a water outlet at the side, wherein: The top wall of the pump housing (1) is formed of a deformable soft rubber sheet (3) at the central portion of the impeller (2). The soft rubber sheet (3) deforms and stretches downward as the negative pressure in the area above the impeller (2) increases, thereby changing the distance between the top wall of the pump housing (1) and the top of the impeller (2), and deforms and resets upward as the negative pressure in the area above the impeller (2) decreases.

2. The water pump for a cleaning machine according to claim 1, characterized in that: The impeller (2) is recessed downward from the center of its top to form a shaft (21) of the impeller (2), the shaft (21) is hollow inside to form a cavity (22), and the soft rubber sheet (3) is arranged corresponding to the cavity (22).

3. The water pump for a cleaning machine according to claim 2, characterized in that: The soft rubber sheet (3) deforms and bulges toward the concave cavity (22) as the negative pressure in the area above the impeller (2) increases.

4. The water pump for a cleaning machine according to claim 2, characterized in that: The upper surface of the impeller (2) and the concave cavity (22) are smoothly transitioned and connected via an arc-shaped structure.

5. The water pump for a cleaning machine according to claim 2, characterized in that: The upper surface of the impeller (2) is provided with radially distributed back blades (23), and the inner ends of the back blades (23) extend to the edge of the concave cavity (22).

6. The water pump for a cleaning machine according to any one of claims 1 to 5, characterized in that: The top of the pump casing (1) is provided with a top cover (4) which is detachably connected thereto; the top wall of the pump casing (1) is provided with an opening corresponding to the arrangement of the impeller (2); the top cover (4) is installed at the opening and covers the opening; the lower surface of the top cover (4) constitutes a part of the inner top wall of the pump casing (1); and the soft rubber sheet (3) is arranged on the top cover (4).

7. The water pump for a cleaning machine according to claim 6, characterized in that: The top cover (4) is made of hard plastic, and the soft plastic sheet (3) is arranged in the middle of the top cover (4) and is formed integrally therewith.

8. The water pump for a cleaning machine according to claim 7, characterized in that: A notch (41) for installing the soft rubber sheet (3) is provided in the middle of the top cover (4), and the soft rubber sheet (3) and the edge of the notch (41) are welded together by injection molding.

9. The water pump for a cleaning machine according to claim 6, characterized in that: A buffer cavity (100) capable of surrounding the soft rubber sheet (3) is arranged on the top cover (4), and a guide hole (42) is provided on the top cover (4) for draining the accumulated water in the buffer cavity (100) into the pump housing (1).

10. The water pump for a cleaning machine according to claim 9, characterized in that: In the finished production state, the soft rubber sheet (3) is slightly arched upward from the edge to the center, and the guide holes (42) are multiple and arranged at intervals around the periphery of the soft rubber sheet (3).

11. The water pump for a cleaning machine according to claim 9, characterized in that: The top of the pump housing (1) is provided with a mounting cover (5) for restraining the top cover (4) on the pump housing (1); the top cover (4) is restrained under the mounting cover (5); the top wall of the pump housing (1) is provided with a first assembly sleeve (12) extending upward from the edge of the opening; the mounting cover (5) is detachably locked on the first assembly sleeve (12).

12. The water pump for a cleaning machine according to claim 11, characterized in that: The edge of the installation cover (5) is provided with a second assembly sleeve (51) extending downward, and the lower surface of the installation cover (5) is provided with a third assembly sleeve (52) extending downward near the second assembly sleeve (51). A clamping groove (50) for clamping the first assembly sleeve (12) therein is formed between the second assembly sleeve (51) and the third assembly sleeve (52), and a sealing ring (53) is also provided in the clamping groove (50) for elastically pressing the third assembly sleeve (52) and the first assembly sleeve (12) respectively.

13. The water pump for a cleaning machine according to claim 12, characterized in that: The upper surface of the top cover (4) is provided with a fourth assembly sleeve (43) extending upward, and the fourth assembly sleeve (43) is inserted into the third assembly sleeve (52) and is pressed and sealed therewith. The upper surface of the top cover (4), the fourth assembly sleeve (43) and the lower surface of the installation cover (5) jointly enclose the buffer cavity (100).

14. A cleaning machine, comprising a box body and a spray arm, wherein a concave water return area is provided at the bottom of the box body, a filter plate is covered on the top of the water return area, and the spray arm is provided on the filter plate, characterized in that: It also includes a water pump according to any one of claims 1 to 13, wherein the pump housing (1) is arranged in a water return area, a water suction gap is provided between the water suction port at the bottom of the pump housing (1) and the bottom of the water return area, and the spray arm is connected to the water outlet of the pump housing (1).

15. The cleaning machine according to claim 14, characterized in that: The water outlet comprises a first water outlet and a second water outlet, the spray arm comprises a first spray arm and a second spray arm, the pump housing (1) is bent upward from its first water outlet and extends to at least the filter plate and is rotatably connected to the first spray arm, and the second spray arm is arranged in the upper middle part of the box body and is connected to the second water outlet through a water supply pipe.

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