Pump shell for cleaning machine, water pump and cleaning machine

Abstract

The pump shell comprises a disc-shaped body, a water inlet is formed in the bottom of the body, a water outlet is formed in the top of the body, a flow channel spirally extending in the circumferential direction is arranged on the side portion of the body, and the tail end of the flow channel extends upwards to form the water outlet located on the top wall of the body. And the water outlet is offset relative to the central part of the body. On the basis of the centrifugal pump shell, the water inlet is formed in the bottom wall so as to meet the requirement for open type communication of a water return area and the pump shell, meanwhile, the tail end of the flow channel extending in the circumferential spiral mode extends upwards to form the water outlet located on the top wall of the body so as to achieve bottom drawing-in and top output of water flow. Therefore, the volume is reduced on the basis of meeting the water drawing pressure and lift, the water consumption is saved, and the water efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dishwashers, in particular to a pump casing, a water pump 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. "An open water pump and cleaning machine" (application number: CN202211216848.9) with publication number CN115573915A discloses an open water pump structure. For an open water pump, it is directly located in the return water area to provide a large water-drawing power and water pressure. In order to meet the water pressure and head requirements, the existing water pump draws water from the return water area from bottom to top at the same time. It is necessary to set a multi-stage impeller or cooperate with the space guide vane in the water pump, resulting in a larger overall volume of the water pump, occupying a larger volume of the return water area, making it difficult to reduce the total volume of the return water chamber, resulting in a certain amount of water waste, affecting the water efficiency of the cleaning machine. Utility Model Content

[0004] The first technical problem to be solved by the utility model is to provide a pump casing for a cleaning machine which can reduce the volume, save water and improve water efficiency on the basis of meeting the water suction pressure and lift, in view of the current status of the prior art.

[0005] The second technical problem to be solved by the utility model is to provide a water pump using the above-mentioned pump casing in view of the current status of the prior art.

[0006] The third technical problem to be solved by the utility model is to provide a cleaning machine using the above-mentioned water pump in view of the current status of the prior art.

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

[0008] A pump casing for a cleaning machine comprises a disc-shaped body, a water inlet at the bottom and a water outlet at the top, a flow channel extending in a circumferential spiral is provided on the side of the body, the end of the flow channel extends upward to form a water outlet located on the top wall of the body, and the water outlet is offset relative to the central part of the body.

[0009] Preferably, the top wall of the body is provided with a water outlet pipe extending upward from the end of the flow channel, and the upper end of the water outlet pipe constitutes the water outlet. This structure facilitates the upward discharge of water, thereby facilitating the installation of the spray arm on the basis of making the upper and lower heights of the water pump thinner.

[0010] Preferably, the bottom of the body is formed with a first flow guiding curved surface at the corresponding inner bottom wall of the flow channel, which smoothly connects the inner bottom wall of the flow channel with the lower port of the water outlet pipe, and the first flow guiding curved surface forms an arc structure that gradually extends upward along the water flow direction. This structure is conducive to reducing the fluid energy loss at the water flow reversal point and maintaining a large water pressure and head.

[0011] In order to facilitate production and assembly, the pump housing includes an upper housing and a lower housing which are spliced ​​together, and the first flow guide curved surface is formed on the lower housing.

[0012] Preferably, the top of the body is formed with a second guide curved surface at the corresponding inner top wall of the flow channel, which smoothly connects the inner top wall of the flow channel with the lower port of the water outlet pipe, and the second guide curved surface forms an arc structure that gradually extends upward along the water flow direction. This structure is conducive to reducing the fluid energy loss at the water flow reversal point and maintaining a large water pressure and head.

[0013] In order to facilitate production and assembly, the pump housing includes an upper housing and a lower housing which are spliced ​​together, and the second flow guide curved surface is formed on the upper housing.

[0014] In order to facilitate production and assembly, the water outlet pipe and the upper shell are formed in one piece.

[0015] In the utility model, the water inlet is opened in the central part of the bottom of the main body, the projection of the central axis of the water outlet pipe on the horizontal plane is O1, the projection of the water inlet on the horizontal plane is O2, the straight lines passing through O1 and O2 constitute the X-axis, the straight line passing through O2 and perpendicular to the X-axis constitutes the Y-axis, the connection between the flow channel and the main body forms a throat part, the volute corresponding to the throat part is in the fourth quadrant, and the height of the volute corresponding to the inner cavity of the pump casing in the positive half axis of the Y-axis is less than the height of the negative half axis.

[0016] Preferably, the starting end of the spiral line corresponding to the inner cavity of the pump casing is point A located at the throat of the fourth quadrant, and the spiral line includes a first curve segment and a second curve segment extending counterclockwise from point A and connected to each other, the end of the first curve segment is point B located on the positive half axis of the Y axis, the starting end of the second curve segment is point B and the end is point C located on the negative half axis of the Y axis, O2C=(1.3~2.0)O2B.

[0017] Preferably, the spiral curve corresponding to the flow channel includes a third curve segment, a fourth curve segment, and a fifth curve segment. The starting end of the third curve segment is point A and the end is point D located on the positive half axis of the X-axis. The starting end of the fourth curve segment is point C and the end is point E located on the positive half axis of the X-axis. The fifth curve segment is formed between D and E and is an arc segment that arches upward above the X-axis.

[0018] A water pump comprises the above-mentioned pump casing, wherein a rotatable centrifugal impeller is arranged in the pump casing.

[0019] 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. A driving member is arranged at the bottom of the box body, and the output shaft of the driving member passes through the bottom wall of the box body and the water inlet and is connected to the centrifugal impeller in the pump casing.

[0020] Preferably, a slag collection basket and a heating element are also provided in the water return area. From a top view, the water pump, slag collection basket and heating element are arranged in a herringbone structure, and the side walls of the water return area are surrounded by the periphery of the herringbone structure to form a triangular structure, wherein the water pump is provided with an offset water outlet and the outlet extends to the central part of the herringbone structure. The water return area is arranged in the center of the bottom of the washing chamber of the cleaning machine, the water pump is offset relative to the center of the bottom wall of the washing chamber, and the water outlet of the water pump is arranged corresponding to the central part of the bottom of the washing chamber. The return water area of ​​the existing washing machine is semicircular in shape as a whole. Considering that the spray arm needs to be arranged in the center relative to the box body in order to better cover the tableware cleaning range, the return water area needs to be offset on the bottom wall of the box body, and the debris collecting basket located next to the spray arm is also offset on the bottom wall of the box body. During the return water process, the ideal effect is that the return water enters the return water area after filtering the residue through the debris collecting basket, and then is further drawn into the spray arm through the water suction port of the open water pump in the return water area. However, since the debris collecting basket is offset too far from the bottom wall of the box body, the return water enters the return water area before flowing to the debris collecting basket, resulting in poor debris collection effect and residue retention problems on the filter plate. At the same time, the structure of the return water area of ​​the existing cleaning machine determines that the heating element located beside the water pump is also offset on the bottom wall of the box. In order to improve the heating efficiency, it is necessary to make the heating element have a corresponding return water area. This requires the return water area to have a volume that meets the installation requirements of the heating element and the slag collection basket, which makes it difficult to reduce the total volume of the return water chamber, resulting in a certain amount of water waste, affecting the water efficiency of the cleaning machine. The utility model sets the return water area as a triangular structure, and uses each corner area of ​​the triangular structure to install the water pump, the slag collection basket, and the heating element, and then guides the outlet water to the remaining space in the central part of the triangular structure through the offset outlet of the water pump, so as to maximize the use of the space of the return water area, which not only greatly reduces the volume of the return water area, which is beneficial to saving the amount of washing water each time, but also helps to improve the return water speed and water efficiency; because the water pump no longer occupies the central part of the bottom of the cleaning machine, the slag collection basket can be closer to the central part of the bottom of the cleaning machine, which is beneficial to improve the slag collection effect.

[0021] The water return area is arranged in the center of the bottom of the inner tank (i.e. the bottom of the washing chamber), the water pump is offset relative to the center of the bottom wall of the inner tank, and the water outlet of the water pump is arranged corresponding to the central part of the bottom of the inner tank. The "water return area is arranged in the center of the bottom of the inner tank" mentioned above means that the center of the water return area roughly overlaps with the center of the bottom wall of the inner tank. Of course, they may not be completely aligned. For example, it can be: a circular area with a diameter of 5 to 10 mm and the center of the water return area falls within the circular area with the center of the bottom wall of the inner tank as the center of the circle; "the water pump is offset relative to the center of the bottom wall of the inner tank" means that the center of the water pump falls outside the above-mentioned circular area.

[0022] Compared with the prior art, the advantages of the utility model are: on the basis of the centrifugal pump casing, the utility model arranges the water inlet on the bottom wall to meet the demand for open connection between the return water area and the pump casing. At the same time, the end of the flow channel extending in the circumferential spiral is extended upward to form a water outlet located on the top wall of the main body to realize the bottom intake and top output of water flow, thereby reducing the volume on the basis of meeting the water intake pressure and head, saving water and thus improving water efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the pump housing of an embodiment of the utility model;

[0024] Figure 2 This is a schematic diagram of the bottom structure of the water pump according to the embodiment of the utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the lower housing of the pump housing of the utility model embodiment;

[0026] Figure 4 This is a schematic diagram of the structure of the upper housing of the pump casing of the utility model embodiment;

[0027] Figure 5 This is a schematic diagram of the structure of a cleaning machine according to an embodiment of the utility model;

[0028] Figure 6 It is a spiral line diagram of the pump casing of the embodiment of the utility model. DETAILED DESCRIPTION

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0030] like Figures 1 to 5 As shown, the pump housing for a cleaning machine of this embodiment is suitable for an open water pump arranged in the washing chamber of the cleaning machine, and the pump housing includes a disc-shaped body 1, a water inlet 11 is opened at the bottom, a water outlet 12 is arranged at the top, and a flow channel 13 extending in a circumferential spiral is arranged on the side of the body 1. The end of the flow channel 13 extends upward to form a water outlet 12 located on the top wall of the body 1, and the water outlet 12 is offset relative to the central part of the body 2.

[0031] The top wall of the body 1 is provided with a water outlet pipe 14 extending upward from the end of the flow channel 13, and the upper end of the water outlet pipe 14 constitutes the water outlet 12. This structure facilitates the upward discharge of water, thereby facilitating the installation of the spray arm on the basis of making the upper and lower heights of the water pump thinner.

[0032] For the convenience of production and assembly, the pump housing includes an upper housing 101 and a lower housing 102 which are spliced ​​together. After the two are spliced ​​together, they can be fixed and sealed by means of buckles, screws, welding, etc. The water outlet pipe 14 is integrally injection molded with the upper housing 101 .

[0033] The bottom of the body 1 is formed with a first guide curved surface 131 at the corresponding inner bottom wall of the flow channel 13, which smoothly connects the inner bottom wall of the flow channel 13 with the lower end of the water outlet pipe 14. The first guide curved surface 31 forms an arc structure that gradually extends upward along the water flow direction. The first guide curved surface 131 is formed on the lower shell 102. The top of the body 1 is formed with a second guide curved surface 132 at the corresponding inner top wall of the flow channel 13, which smoothly connects the inner top wall of the flow channel 13 with the lower end of the water outlet pipe 14. The second guide curved surface 132 forms an arc structure that gradually extends upward along the water flow direction. The second guide curved surface 132 is formed on the upper shell 101. The above structure is conducive to reducing the fluid energy loss at the water flow reversal point and maintaining a large water pressure and head.

[0034] In this embodiment, the water inlet 11 is opened at the central part of the bottom of the body 1. Figure 6 As shown, the projection of the central axis of the outlet pipe 14 on the horizontal plane is O1, the projection of the water inlet 11 on the horizontal plane is O2, the straight lines passing through O1 and O2 constitute the X-axis, the straight line passing through O2 and perpendicular to the X-axis constitutes the Y-axis, and the connection between the flow channel 13 and the body 1 forms a throat portion 15, and the volute corresponding to the throat portion 15 is in the fourth quadrant, and the height of the volute corresponding to the inner cavity of the pump casing in the positive half axis of the Y-axis is less than the height of the negative half axis.

[0035] Specifically, the starting end of the spiral line corresponding to the inner cavity of the pump casing is point A located at the throat portion 15 of the fourth quadrant. The spiral line includes a first curve segment 01 and a second curve segment 02 that extend counterclockwise from point A and are connected to each other. The end of the first curve segment 01 is point B located on the positive half axis of the Y axis. The starting end of the second curve segment 02 is point B and the end is point C located on the negative half axis of the Y axis. O2C = (1.3-2.0) O2B. The spiral line corresponding to the flow channel 13 includes a third curve segment 03, a fourth curve segment 04, and a fifth curve segment 02. The starting end of the third curve segment 03 is point A and the end is point D located on the positive half axis of the X axis. The starting end of the fourth curve segment 04 is point C and the end is point E located on the positive half axis of the X axis. The fifth curve segment 05 is formed between D and E and is an arc segment that arches upward above the X axis.

[0036] The water pump of this embodiment comprises the above-mentioned pump casing, in which a rotatable centrifugal impeller 2 is arranged.

[0037] The cleaning machine of this embodiment includes a box body 3, a concave water return area 31 is arranged at the bottom of the box body 3, and also includes the above-mentioned water pump, which is arranged in the water return area 31. A driving member is arranged at the bottom outside the box body 3. The output shaft of the driving member passes through the bottom wall of the box body 3 and the water inlet 11 and is connected to the centrifugal impeller 2 in the pump casing to drive the centrifugal impeller 2 to rotate and realize water pumping.

[0038] The return water area 31 is also provided with a slag collection basket 4 and a heating element 5. From a top view, the water pump, the slag collection basket 4 and the heating element 5 are arranged in a herringbone structure. The side walls of the return water area 31 are enclosed in the periphery of the herringbone structure to form a triangular structure, wherein the water pump is provided with an offset water outlet 12 and the water outlet 12 extends to the central part of the herringbone structure. The return water area 31 is arranged in the center of the bottom of the washing chamber of the cleaning machine, the water pump is offset relative to the center of the bottom wall of the washing chamber, and the water outlet 12 of the water pump is arranged corresponding to the central part of the bottom of the washing chamber. The return water area of ​​the existing washing machine is semicircular in shape as a whole. Considering that the spray arm needs to be arranged in the center relative to the box body in order to better cover the tableware cleaning range, the return water area needs to be offset on the bottom wall of the box body, and the debris collecting basket located next to the spray arm is also offset on the bottom wall of the box body. During the return water process, the ideal effect is that the return water enters the return water area after filtering the residue through the debris collecting basket, and then is further drawn into the spray arm through the water suction port of the open water pump in the return water area. However, since the debris collecting basket is offset too far from the bottom wall of the box body, the return water enters the return water area before flowing to the debris collecting basket, resulting in poor debris collection effect and residue retention problems on the filter plate. At the same time, the structure of the return water area of ​​the existing cleaning machine determines that the heating element located beside the water pump is also offset on the bottom wall of the box. In order to improve the heating efficiency, it is necessary to make the heating element have a corresponding return water area. This requires the return water area to have a volume that meets the installation requirements of the heating element and the slag collection basket, which makes it difficult to reduce the total volume of the return water chamber, resulting in a certain amount of water waste, affecting the water efficiency of the cleaning machine. The utility model sets the return water area as a triangular structure, and uses each corner area of ​​the triangular structure to install the water pump, the slag collection basket, and the heating element, and then guides the outlet water to the remaining space in the central part of the triangular structure through the offset outlet of the water pump, so as to maximize the use of the space of the return water area, which not only greatly reduces the volume of the return water area, which is beneficial to saving the amount of washing water each time, but also helps to improve the return water speed and water efficiency; because the water pump no longer occupies the central part of the bottom of the cleaning machine, the slag collection basket can be closer to the central part of the bottom of the cleaning machine, which is beneficial to improve the slag collection effect.

[0039] Based on the centrifugal pump casing, the present embodiment sets the water inlet 11 on the bottom wall to meet the requirement of open connection between the return water area 31 and the pump casing 1. At the same time, the end of the circumferential spiral extension flow channel 13 is extended upward to form a water outlet 12 located on the top wall of the main body 1 to achieve the bottom intake and top output of water flow, thereby reducing the volume on the basis of meeting the water intake pressure and head, saving water and improving water efficiency. The present water pump forms an open water pump in the return water area, and the water flow connection between the return water area and the water pump can be achieved without pipeline connection, which is convenient for achieving no residual water in the water pump; the water pump casing completely surrounds the impeller therein, reducing the volume leakage loss. At the same time, the water pump realizes the pressurized extraction of water flow through the spiral extension flow channel, which not only meets the pressurization demand of the water flow, but also reduces the bending path of the water flow output, which is conducive to reducing the fluid energy loss, thereby improving the water pumping efficiency and head.

[0040] 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 pump housing for a cleaning machine, comprising a disc-shaped body (1), a water inlet (11) at the bottom, and a water outlet (12) at the top, characterized in that: The side of the body (1) is provided with a flow channel (13) extending in a circumferential spiral direction, the end of the flow channel (13) extends upward to form a water outlet (12) located on the top wall of the body (1), and the water outlet (12) is offset relative to the central part of the body (1).

2. The pump housing for a cleaning machine according to claim 1, characterized in that: The top wall of the body (1) is provided with a water outlet pipe (14) extending upward from the end of the flow channel (13), and the upper end of the water outlet pipe (14) constitutes the water outlet (12).

3. The pump housing for a cleaning machine according to claim 2, characterized in that: A first flow-guiding curved surface (131) is formed at the bottom of the body (1) at the inner bottom wall of the corresponding flow channel (13) to smoothly connect the inner bottom wall of the flow channel (13) with the lower end of the water outlet pipe (14); the first flow-guiding curved surface (131) forms an arc-shaped structure that gradually extends upward along the direction of water flow.

4. The pump housing for a cleaning machine according to claim 3, characterized in that: The pump casing comprises an upper casing (101) and a lower casing (102) which are spliced ​​together, and the first flow guide curved surface (131) is formed on the lower casing (102).

5. The pump housing for a cleaning machine according to claim 2, characterized in that: A second flow-guiding curved surface (132) is formed at the top of the main body (1) at the inner top wall of the corresponding flow channel (13) and smoothly connects the inner top wall of the flow channel (13) with the lower end of the water outlet pipe (14); the second flow-guiding curved surface (132) forms an arc-shaped structure that gradually extends upward along the direction of water flow.

6. The pump housing for a cleaning machine according to claim 5, characterized in that: The pump casing comprises an upper casing (101) and a lower casing (102) which are spliced ​​together, and the second flow guide curved surface (132) is formed on the upper casing (101).

7. The pump housing for a cleaning machine according to claim 6, characterized in that: The water outlet pipe (14) and the upper shell (101) are integrally formed.

8. The pump housing for a cleaning machine according to any one of claims 2 to 7, characterized in that: The water inlet (11) is opened at the central part of the bottom of the body (1); the projection of the central axis of the water outlet pipe (14) on the horizontal plane is O1; the projection of the water inlet (11) on the horizontal plane is O2; the straight lines passing through O1 and O2 constitute the X-axis; the straight line passing through O2 and perpendicular to the X-axis constitutes the Y-axis; the connection between the flow channel (13) and the body (1) forms a throat portion; the spiral line corresponding to the throat portion is in the fourth quadrant; the height of the spiral line corresponding to the pump casing inner cavity on the positive half axis of the Y-axis is less than the height on the negative half axis.

9. The pump housing for a cleaning machine according to claim 8, characterized in that: The starting end of the spiral line corresponding to the inner cavity of the pump casing is point A located at the throat of the fourth quadrant. The spiral line includes a first curve segment (01) and a second curve segment (02) extending counterclockwise from point A and connected to each other. The end of the first curve segment (01) is point B located on the positive half axis of the Y axis. The starting end of the second curve segment (02) is point B and the end is point C located on the negative half axis of the Y axis. O2C=(1.3-2.0)O2B.

10. The pump housing for a cleaning machine according to claim 9, characterized in that: The spiral curve corresponding to the flow channel (13) comprises a third curved line segment (03), a fourth curved line segment (04), and a fifth curved line segment (05); the starting end of the third curved line segment (03) is point A, and the end point is point D located on the positive half axis of the X-axis; the starting end of the fourth curved line segment (04) is point C, and the end point is point E located on the positive half axis of the X-axis; the fifth curved line segment (05) is formed between point D and point E and is an arc segment that arches upward above the X-axis.

11. A water pump, characterized in that: The pump casing comprises the pump casing as claimed in any one of claims 1 to 10, wherein a rotatable centrifugal impeller (2) is arranged in the pump casing.

12. A cleaning machine, comprising a box (3), wherein a concave water return area (31) is provided at the bottom of the box (3), characterized in that: It also includes the water pump as described in claim 11, which is arranged in the return water area (31), and a driving member is provided at the outer bottom of the box body (3), and the output shaft of the driving member passes through the bottom wall of the box body (3) and the water inlet (11) and is connected to the centrifugal impeller (2) in the pump casing.

13. The cleaning machine according to claim 12, characterized in that: A slag collecting basket (4) and a heating element (5) are also provided in the water return area (31). When viewed from a top view, the water pump, the slag collecting basket (4) and the heating element (5) are arranged in a herringbone structure. The side walls of the water return area (31) are enclosed at the periphery of the herringbone structure to form a triangular structure. The water pump is provided with an offset water outlet (12) and the water outlet extends to the central portion of the herringbone structure.

14. The cleaning machine according to claim 13, characterized in that: The water return area (31) is arranged centrally at the bottom of the washing chamber of the cleaning machine, the water pump is offset relative to the center of the bottom wall of the washing chamber, and the water outlet (12) of the water pump is arranged corresponding to the central part of the bottom of the washing chamber.

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