CN109965821B

CN109965821B - Cleaning machine

Info

Publication number: CN109965821B
Application number: CN201711463051.8A
Authority: CN
Inventors: 郑峰; 顾洪良; 徐慧
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2017-12-28
Filing date: 2017-12-28
Publication date: 2021-10-29
Anticipated expiration: 2037-12-28
Also published as: CN109965821A

Abstract

The invention relates to a cleaning machine, comprising a box body, a spray arm and a water pump, wherein the box body is provided with a washing space, the spray arm is arranged in the washing space, the water pump is provided with an impeller assembly which can pump water in the washing space into the spray arm, the impeller assembly comprises a first impeller which can disperse fluid along the radial direction and a second impeller which can draw the fluid in the axial direction, and the second impeller is arranged at the upstream of the first impeller according to the fluid flowing direction. When the impeller is used, the second impeller is axial, so that the relative flow rate of water flow at the outer edge of the second impeller is the maximum, bubbles can be generated at the outer edge of the second impeller at first, when the water flow reaches the first impeller, the liquid close to the first central shaft compresses the bubbles at the outer edge under the action of centrifugal force, the liquid can only move close to the outer edge along the axial direction, and the bubbles collapse at a high-pressure area formed at the upper end of the first impeller, so that the development of the bubbles is greatly limited, the cavitation erosion resistance of the first impeller is improved, the flow and the lift of the pump are improved, and the cleaning effect is improved.

Description

Cleaning machine

Technical Field

The invention relates to a cleaning machine.

Background

The water pump adopted in the existing dish or fruit and vegetable washing machine has two types of closed type and open type, which mainly aims at the situation that whether the impeller is positioned in the closed cavity, the closed type water pump has a complex structure and higher processing requirements, and the open type water pump does not have the problems.

Chinese patent No. CN104235061B entitled "an open water pump" (application No. CN201310750285.6) discloses a structure including an upper housing, a lower housing, and an impeller, where the impeller includes a shaft located at the center and a plurality of axially extending first blades uniformly distributed on the circumferential surface of the shaft along the circumferential direction, the first blades are axially divided into an upper section and a lower section connected to each other, an upper accommodating cavity for accommodating the upper section of the first blades is formed in the upper housing, a lower accommodating cavity for accommodating the lower section of the first blades is formed in the lower housing, a water inlet of the water pump is located below and at the side surface of the lower housing, a water outlet is located at the side surface of the upper housing, the bottom of at least the lower section of the first blades is gradually and smoothly bent on the circumferential surface of the shaft along the rotation direction of the impeller, and the height ratio of the lower section height of the first blades to the upper section height is 1-5. The impeller can draw water at a low water level, is not easy to cause bubbles formed by cleaning solution or food residues on the water surface to be drawn into the impeller to influence the water drawing, and can draw enough flow from the water inlet. However, since the first blades for the axial drawing and the centrifugal dispersion are integrally formed and the first blade portion for the axial drawing is short, when cavitation bubbles carried in the liquid develop to a certain extent during the drawing, the characteristics of the outer edge of the first blade are affected to degrade the performance, since the liquid in the flow passage of the centrifugal first blade flows from the axial direction to the radial direction and the density of the liquid is higher than that of the gas, the cavitation bubbles in the liquid are easily separated under the action of the centrifugal force and rapidly expand to block the flow passage, so that the suction performance of the pump is rapidly reduced, the flow rate of the discharged water is affected, and the cleaning effect of the cleaning machine using the water pump is affected.

Disclosure of Invention

The invention aims to solve the technical problem of the prior art and provides a cleaning machine which can improve the flow and the lift of a pump by limiting the development of cavitation bubbles in liquid so as to improve the cleaning effect.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a cleaning machine, includes box, spray arm and water pump, the box has the washing space, the spray arm is located in this washing space, the water pump has the impeller subassembly that can go into the water pump in the washing space in the spray arm, its characterized in that: the impeller assembly comprises a first impeller capable of dispersing fluid in a radial direction and a second impeller capable of drawing fluid in an axial direction, wherein the second impeller is arranged at the upstream of the first impeller according to the fluid flow direction.

In the above aspect, the first impeller includes a first central shaft and at least two first blades, and the first blades are arranged at intervals on the outer periphery of the first central shaft.

As a modification, the first central shaft is formed with an end cover having an outer diameter gradually increasing in the fluid flow direction, and at least a part of the edge of the first blade is connected to an inner end surface of the end cover. By adopting the structure, a concave cavity is formed at the upper end of the end cover, and a negative pressure area is formed between the concave cavity and the inner top wall of the spray arm in the use process, so that water flow can go upwards; meanwhile, the lower surface of the end cover can prevent cavitation bubbles mixed in water flow from continuously floating upwards and separating out, the risk that the cavitation bubbles block a flow channel can be effectively reduced, and adverse effects on the suction performance of the pump are avoided.

Preferably, the first vanes are arranged on the end cover and the first central shaft in a radial direction of the first central shaft.

Preferably, the spray arm is hollow to form a water collecting cavity, a water inlet communicated with the water collecting cavity is formed in the side wall of the spray arm, and at least the upper part of the first blade penetrates through the water inlet and extends into the water collecting cavity. The lower surface of the end cover and the outer peripheral surface of the first central shaft form a smooth-transition arc surface, correspondingly, the first blade is formed into a fan-shaped structure with a notch at the position of a circle center, a longer arc edge on the fan-shaped structure is matched and connected with the arc surface, and the upper part of the fan-shaped structure extends to the outer side of the end cover or the outer edge of the fan-shaped structure is flush with the edge of the end cover. The structure can ensure that the first blade, the end cover and the first central shaft are compactly matched, the line shape is smooth, and a better centrifugal dispersion effect is realized on water flow.

In each of the above preferred embodiments, the second impeller includes a second center shaft and second blades provided on an outer peripheral surface of the second center shaft, and the second blades extend spirally in the axial direction on the outer peripheral surface of the second center shaft. The impeller with the structure has good axial water drawing performance, and the relative flow velocity of fluid at the outer edge of the second impeller is the maximum, so that cavitation bubbles can be generated at the outer edge of the second impeller at first, and the impeller is matched with the first impeller with the centrifugal effect at the downstream of the second impeller, and the development of the cavitation bubbles is limited.

As an improvement, the second blades are two, and the two second blades are arranged on the outer peripheral surface of the second central shaft in a staggered spiral mode.

Preferably, the total number of spiral turns of the two second blades on the outer peripheral surface of the second central shaft is one, and the number of spiral turns of each second blade on the outer peripheral surface of the second central shaft is half of one.

Preferably, a flow guide sleeve is arranged between the water pump and the water inlet of the spray arm, the second impeller is arranged in the flow guide sleeve, a shaft sleeve capable of rotating relative to the flow guide sleeve is arranged on the periphery of the second impeller, and the inner wall surface of the shaft sleeve is connected with the outer edge of the second blade and is coaxially arranged with the second central shaft. The structure can avoid the interference between the edge of the second blade and the inner wall surface of the guide sleeve.

Compared with the prior art, the invention has the advantages that: the impeller assembly comprises a first impeller capable of dispersing fluid along a radial direction and a second impeller capable of drawing the fluid in an axial direction, wherein the second impeller is arranged at the upstream of the first impeller according to the fluid flowing direction, when the impeller assembly is used, because the second impeller is axial, the relative flow velocity of water flow at the outer edge of the second impeller is the largest, cavitation can be generated at the outer edge of the second impeller firstly, when the fluid reaches the first impeller, the fluid close to a first central shaft compresses the cavitation bubbles at the outer edge under the action of centrifugal force, so that the fluid can only move close to the outer edge along the axial direction, and the cavitation bubbles collapse in a high-pressure area formed at the upper end of the first impeller, thereby greatly limiting the development of the cavitation bubbles, improving the cavitation erosion resistance of the first impeller, improving the flow and lift of a pump, and further improving the cleaning effect.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is a schematic view of an assembly structure of the motor, the flow guide sleeve and the first impeller in fig. 1;

FIG. 3 is a schematic structural diagram of a first impeller according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of the hidden shaft sleeve of FIG. 3;

FIG. 5 is a schematic structural diagram of a second impeller according to an embodiment of the present invention;

FIG. 6 is a schematic view of the structure of FIG. 5 at another angle;

fig. 7 is a schematic view of an assembly structure of the motor, the first impeller and the second impeller according to the embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 7, the cleaning machine of the present embodiment includes a box body 1, a spray arm 2 and a water pump 3, and the cleaning machine of the present embodiment can be designed as a water tank type cleaning machine. The cabinet 1 is hollow to form a washing space 11, and the shower arm 2 is rotatably provided at the bottom of the washing space 11. Thereby spray arm 2 is inside cavity and forms catchment chamber 21, and it has the water inlet 22 that is linked together with catchment chamber 21 to open on the lower lateral wall of spray arm 2, has seted up a plurality of apopores 23 of interval arrangement on the last lateral wall of spray arm 2.

The water pump 3 includes a motor 31 and an impeller assembly 4 capable of pumping water in the washing space 11 into the spray arm 2, the impeller assembly 4 includes a first impeller 41 capable of dispersing fluid in a radial direction and a second impeller 42 capable of drawing fluid in an axial direction, the second impeller 42 is disposed upstream of the first impeller 41 according to a fluid flow direction, and the second impeller 42 of the present embodiment is disposed below the first impeller 41. The first impeller 41 and the second impeller 42 are both connected to an output shaft 311 of the motor 31.

The first impeller 41 of the present embodiment includes a first central shaft 411 and a plurality of first blades 412, and the first blades 412 are arranged at intervals on the outer periphery of the first central shaft 411. The outer diameter of the first center shaft 411 is gradually increased in the fluid flow direction to form an end cover 413 in an umbrella shape, and a part of the edge of the first blade 412 is connected to an inner end surface of the end cover 413. Specifically, the first vanes 412 are arranged on the end cover 413 and the first center shaft 411 in a radial direction of the first center shaft 411. The majority of the first blade 412 projects through the water inlet 22 into the water collection chamber 21 of the spray arm 2. A smooth transition arc 400 is formed between the lower surface of the end cover 413 and the outer peripheral surface of the first central shaft 411, correspondingly, the first blade 412 is formed into a fan-shaped structure with a notch 410 at the central angle, the longer arc edge of the fan-shaped structure is matched and connected with the arc 400, and the upper part of the fan-shaped structure extends to the outer side of the end cover 413 or is flush with the edge of the end cover 413. The first impeller 41 of the present embodiment is integrally formed. The structure enables the first blade 412, the end cover 413 and the first central shaft 411 to be compactly matched, and the linear shape of the first blade is smooth, so that the first blade plays a better centrifugal dispersion role in water flow.

The second impeller 42 of the present embodiment includes a second central shaft 421 and a second blade 422 provided on the outer peripheral surface of the second central shaft 421, and the second blade 422 extends spirally in the axial direction on the outer peripheral surface of the second central shaft 421. The impeller with the structure has good axial water drawing performance, and the relative flow velocity of fluid at the outer edge of the second impeller 42 is the maximum, so that cavitation bubbles can be generated at the outer edge of the second impeller 42 firstly, and the cavitation bubbles are matched with the first impeller 41 with the centrifugal effect at the downstream of the second impeller 422, and the development of the cavitation bubbles is limited. The second blades 422 of this embodiment are two, and the two second blades 422 are arranged in a staggered spiral on the outer circumferential surface of the second central shaft 421. The total number of spiral turns of the two second blades 422 on the outer peripheral surface of the second central shaft 421 is one, and the number of spiral turns of each second blade 422 on the outer peripheral surface of the second central shaft 421 is half one. A flow guide sleeve 5 is arranged between the water pump 3 and the water inlet 22 of the spray arm 2, the second impeller 42 is arranged in the flow guide sleeve 5, a shaft sleeve 423 capable of rotating relative to the flow guide sleeve 5 is arranged on the periphery of the second impeller 42, and the inner wall surface of the shaft sleeve 423 is connected with the outer edge of the second blade 422 and is coaxially arranged with the second central shaft 421. The second impeller 42 of the present embodiment is integrally formed. This structure can prevent the edge of the second blade 422 from interfering with the inner wall surface of the shroud 5.

When the cleaning machine of the embodiment is used, because the second impeller 42 is axial, the relative flow velocity of water flow at the outer edge of the second impeller 42 is the largest, and cavitation bubbles can firstly occur at the outer edge of the second impeller 42, when the water flow reaches the first impeller 41, the liquid close to the first central shaft 411 compresses the cavitation bubbles at the outer edge under the action of centrifugal force, so that the liquid can only move close to the outer edge along the axial direction, and the cavitation bubbles collapse at a high-pressure area formed at the upper end of the first impeller 41, thereby greatly limiting the development of the cavitation bubbles, improving the cavitation erosion resistance of the first impeller, improving the flow and lift of the pump, and further improving the cleaning effect.

Claims

1. The utility model provides a cleaning machine, includes box (1), spray arm (2) and water pump (3), box (1) has washing space (11), spray arm (2) are located in this washing space (11), water pump (3) have can with wash the impeller subassembly (4) of water pump income spray arm (2) in the space (11), its characterized in that: the impeller assembly (4) comprises a first impeller (41) capable of dispersing fluid in a radial direction and a second impeller (42) capable of drawing fluid in an axial direction, and the second impeller (42) is arranged upstream of the first impeller (41) according to the fluid flow direction;

the first impeller (41) comprises a first central shaft (411) and first blades (412), and the first blades (412) are at least two and are arranged at intervals on the periphery of the first central shaft (411); the outer diameter of the first central shaft (411) is gradually increased along the fluid flow direction to form an end cover (413), and at least part of the edge of the first blade (412) is connected to the inner end face of the end cover (413); a smooth transition arc surface (400) is formed between the lower surface of the end cover (413) and the outer peripheral surface of the first central shaft (411), correspondingly, the first blade (412) is formed into a fan-shaped structure with a notch (410) at the center of a circle, the longer arc-shaped edge of the fan-shaped structure is matched and connected with the arc surface (400), and the upper part of the fan-shaped structure extends to the outer side of the end cover (413) or the outer edge of the fan-shaped structure is flush with the edge of the end cover (413);

the second impeller (42) comprises a second central shaft (421) and second blades (422) arranged on the outer peripheral surface of the second central shaft (421), and the second blades (422) spirally extend on the outer peripheral surface of the second central shaft (421) along the axial direction; a flow guide sleeve (5) is arranged between the water pump (3) and the water inlet (22) of the spray arm (2), the second impeller (42) is arranged in the flow guide sleeve (5), a shaft sleeve (423) capable of rotating relative to the flow guide sleeve (5) is arranged on the periphery of the second impeller (42), and the inner wall surface of the shaft sleeve (423) is connected with the outer edge of the second blade (422) and is coaxially arranged with the second central shaft (421).

2. The cleaning machine of claim 1, wherein: the first vanes (412) are arranged on the end cover (413) and the first central shaft (411) in a radial direction of the first central shaft (411).

3. The cleaning machine of claim 2, wherein: the spraying arm (2) is hollow inside to form a water collecting cavity (21), a water inlet (22) communicated with the water collecting cavity (21) is formed in the side wall of the spraying arm (2), and at least the upper part of the first blade (412) penetrates through the water inlet (22) to extend into the water collecting cavity (21).

4. The cleaning machine of claim 1, wherein: the second blades (422) are two, and the two second blades (422) are arranged on the outer peripheral surface of the second central shaft (421) in a staggered spiral mode.

5. The cleaning machine of claim 4, wherein: the total number of spiral turns of the two second blades (422) on the outer peripheral surface of the second central shaft (421) is one turn, and the number of spiral turns of each second blade (422) on the outer peripheral surface of the second central shaft (421) is half a turn.