Open water pump and cleaning machine

Abstract

The present invention relates to an open water pump and cleaning machine, comprising a pump casing, a cover plate, and an impeller. The pump casing has a water inlet at the bottom, a first water outlet at the top, and a second water outlet at the side. The cover plate is arranged in the pump casing and divides the inner cavity of the pump casing into an upper cavity and a lower cavity. The lower cavity is provided with a first flow channel and a second flow channel arranged opposite to each other and used to pump water out in both directions on the circumference. The second water outlet is arranged on the side of the lower cavity and is connected to the first flow channel. A notch is provided on the edge of the cover plate for connecting the second flow channel to the upper cavity. The first water outlet is connected to the upper cavity. The present invention utilizes the cover plate to constrain the first flow channel and the second flow channel for diverting water in the pump casing. Under its diversion effect, the interference problem of the two water outlets is eliminated, the energy loss of the water flow is reduced, and the two water outlets can maintain a high head and a large water flow rate. The operation of the water pump of the present invention can be completed by relying on only one impeller. The overall structure is simple, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of dishwashers, and in particular to an open water pump and a washing machine. Background Art

[0002] Larger dishwashers typically have at least two sets of spray arms arranged vertically to achieve optimal washing results. During operation, a wash pump delivers water to each spray arm for spraying. After rinsing dishes, the water returns to the water cup at the bottom of the dishwasher, where it is pumped back to the spray arms, completing a water cycle.

[0003] For example, the Chinese invention patent application "Energy-saving Dishwasher" (application number: CN201611232345.5) with application publication number CN106859563A discloses a structure, which includes a cavity for accommodating tableware and providing a cleaning space, a spray system for spraying water to wash the tableware, and a pump body for pumping water and supplying water to the spray system; the spray system is arranged in the cavity; the water pumping end of the pump body is connected to the cavity, and the water supply end is connected to the spray system; the spray system includes an inner water pipe and two or more spray devices, and the two or more spray devices are respectively arranged on the inner water pipe; the water supply end of the pump body is connected to a water distribution device, and the water distribution device is provided with two or more water outlets corresponding to the two or more spray devices, and the spray devices are connected to the corresponding water outlets; when working, the water distribution device opens one or more water outlets according to instructions, so that one or more spray devices perform cleaning work.

[0004] In the aforementioned existing dishwashers capable of both bottom and top spraying, the pump used to supply water to the spray system typically employs a closed structure. Specifically, the pump housing is located below the dishwasher, housing a rotatable impeller. The water inlet of the pump housing communicates with the bottom of the wash chamber, while the water outlet is connected to a water diversion device that divides the water flow into a first branch supplying water to the first spray arm and a second branch supplying water to the second spray arm. Because the water pressures for both the top and bottom sprays are independently supplied by the wash pump, the head, flow rate, and impact force of the water flow in each branch are significantly reduced after diversion, impacting the cleaning effect.

[0005] To address the above-mentioned issues, the applicant's prior patent application ZL 202023348766.9, "A dual-pump system and a cleaning machine using the dual-pump system," discloses a structure comprising an upper impeller, a lower impeller, an upper housing, a lower housing, and a drive element. The upper housing has a first accommodating chamber for mounting the upper portion of a first blade, the upper portion of the lower housing has a second accommodating chamber for mounting the lower portion of the first blade, a first water inlet is provided on the side wall of the lower housing for supplying water into the second accommodating chamber, the lower portion of the lower housing has a third accommodating chamber for mounting the lower impeller, and a second water inlet and outlet are provided on the side wall and / or bottom wall of the lower housing. The dual-pump system is an open system. The second accommodating chamber, the first accommodating chamber, and the upper impeller supply water for the bottom spray, while the third accommodating chamber and the lower impeller supply water for the top and / or middle spray. Since the power of the two water flows is independently supplied by the corresponding pumps, the head and water flow of each water flow are increased, which is conducive to improving the cleaning effect.

[0006] However, since it uses an independent upper impeller to supply water to the bottom layer and a lower impeller to supply water to the upper layer, the overall structure is relatively complex and the production cost is high, and it is impossible to take into account the pumping effect while saving costs. Summary of the Invention

[0007] An open water pump that can provide power for two washing water routes respectively, and improves the head and water flow rate on the basis of simplifying the structure and saving costs, thereby improving the cleaning effect.

[0008] The second technical problem to be solved by the present invention is to provide a cleaning machine using the above-mentioned open water pump in response to the current status of the existing technology.

[0009] The technical solution adopted by the present invention to solve at least one of the above technical problems is:

[0010] An open water pump comprising:

[0011] The pump housing has a water inlet at the bottom, a first water outlet at the top and a second water outlet at the side;

[0012] a cover plate disposed in the pump housing and dividing the inner cavity of the pump housing into an upper cavity and a lower cavity; a first flow channel and a second flow channel arranged opposite to each other and used for pumping water out in two directions are formed on the circumference of the lower cavity; the second water outlet is disposed on the side of the lower cavity and communicates with the first flow channel; a notch is formed on the edge of the cover plate for communicating the second flow channel with the upper cavity; and the first water outlet is communicated with the upper cavity;

[0013] The impeller is rotatably arranged in the lower cavity and is used to provide power for bidirectional water pumping.

[0014] Preferably, the lower cavity of the pump housing is provided with a first diverter portion and a second diverter portion that spirally extend inwardly from the inner circumferential wall of the pump housing. The first diverter portion and the second diverter portion are arranged opposite each other circumferentially of the pump housing, with their tips facing the incoming water direction, thereby forming a diverter end. The first and second diverter portions cooperate with the inner wall of the pump housing to form a symmetrically arranged first and second flow channel structures that are tangentially connected to the water-drawing area in the center of the lower cavity, thereby improving the diversion and water-drawing effects, reducing fluid energy loss, and increasing water flow rate and head.

[0015] Preferably, the first flow channel is formed on the periphery of the first diverter portion, and the second flow channel is formed on the periphery of the second diverter portion, and the water outlet directions of the first flow channel and the second flow channel are opposite. This structure and arrangement is conducive to the rational distribution of the flow of the first flow channel and the second flow channel, and improves the diverted flow rate.

[0016] Preferably, the portion of the inner bottom wall of the pump housing corresponding to the second flow channel extends upward along the direction of water flow to form a diversion slope for directing water toward the notch in the cover plate. Because water diverted from the second flow channel is directed upward through the first water outlet, the provision of this diversion slope helps improve water diversion, providing flow rectification and diversion, preventing fluid turbulence during the transition from circumferential to axial flow, thereby reducing energy loss.

[0017] As an improvement, the lower surface of the cover plate is provided with vertically extending first and second diverter blades. The first diverter blade is arranged close to the outer wall of the first diverter portion, with its end extending toward the water inlet along the extension trajectory of its diverter end. The second diverter blade is arranged close to the outer wall of the second diverter portion, with its end extending toward the water inlet along the extension trajectory of its diverter end. This structure can bring the water diversion structure closer to the water inlet, thereby improving the water diversion effect.

[0018] Preferably, the second splitter blade is arranged close to the inner edge of the guide slope, and the outer sidewall of the second splitter blade, the guide slope, and the inner sidewall of the pump casing outside the guide slope together enclose the second flow channel. This structure not only encloses the second flow channel and increases its depth, but also ensures a reasonable vertical connection between the second flow channel and the notch, thereby reducing fluid energy loss.

[0019] Preferably, the notch includes a first portion and a second portion arranged along the water flow direction. The first portion is located at the end of the second splitter blade and forms the inlet guide area of the second flow channel. The second portion is arranged above the second splitter blade and corresponds to the width of the second flow channel. This notch structure more effectively cooperates with the second flow channel, ensuring that the fluid is consistently guided and rectified during the reversal process, thereby reducing energy loss.

[0020] Preferably, the first water outlet is located in the center of the top wall of the pump housing, and the upper surface of the cover plate is provided with a baffle for directing water flowing upward through the notch toward the first water outlet. This structure not only boosts the water flow directed upward through the second flow channel, but also guides this flow to reduce energy loss.

[0021] Further preferably, the top edge of the baffle contacts the inner top wall of the pump casing to enclose a converging flow channel, which includes a semi-enclosed converging area arranged around the first water outlet and a guide area whose width gradually increases from the opening of the converging area to the inner wall of the pump casing, and the guide area surrounds the notch.

[0022] Preferably, the baffle includes an arcuate segment for defining a semi-enclosed converging area, a first curved segment extending from the first end of the arcuate segment toward the inner sidewall of the pump casing, and a second curved segment extending from the second end of the arcuate segment toward the inner sidewall of the pump casing. The first curved segment is positioned corresponding to the edge of the notch at the entrance of the second flow channel, and the second curved segment is positioned corresponding to and outside the end of the second flow channel. This structure constrains the positional arrangement of the converging flow channel, the notch, and the second flow channel, further reducing energy loss and increasing water pressure.

[0023] Preferably, the upper surface of the cover plate is provided with a guide member located within the semi-enclosed flow-concentrating area and configured to direct water toward the first water outlet. The guide member is formed into a tapered structure that gradually extends upward from the edge of the semi-enclosed flow-concentrating area toward the center. This structure further reduces energy loss and increases water pressure.

[0024] Further preferably, the inner wall surface of the pump housing corresponding to the upper cavity extends radially outward and inward, from bottom to top, to form a curved flow guide structure that matches the outer surface of the tapered structure. The curved flow guide structure and the tapered structure together enclose a flow guide channel whose lower end connects with the notch at the upper end of the second flow channel and whose upper end smoothly connects with the first water outlet. This structure further reduces energy loss and increases water pressure.

[0025] Preferably, the impeller is a centrifugal impeller having a water inlet at the bottom and a water outlet at the side. The ends of the first and second diverter blades are both located near the edge of the impeller and corresponding to the water outlet. The inner wall surfaces of the first and second diverter blades cooperate with the impeller to pressurize the circumferentially flowing water. Simultaneously, during the circumferential flow of the water, the ends of the first and second diverter blades can divert the water while reducing energy loss.

[0026] Preferably, the impeller bottom extends radially from the outside to the inside and from the top to the bottom to form a downward-protruding water inlet. Correspondingly, at least a portion of the pump casing bottom wall extends radially from the outside to the inside and from the top to the bottom to form a downward-protruding water suction port that matches the water inlet. This structure lowers the water pump suction port, which is beneficial for improving water suction and return efficiency and preventing gas inhalation.

[0027] A cleaning machine comprises a box body, a first spray arm and a second spray arm, and also comprises the above-mentioned open water pump, a concave return water area is provided at the bottom of the box body, the top of the return water area is covered with a filter plate, the pump housing is arranged in the return water area, and there is a water suction gap between the water suction port at the bottom of the pump housing and the bottom of the return water area, the first water outlet at the top of the pump housing is located above the filter plate and is connected to the water inlet of the first spray arm, the second spray arm is arranged in the upper middle part of the box body and is connected to the second water outlet of the pump housing through a water supply pipe.

[0028] Compared with the prior art, the advantages of the present invention are: the present invention utilizes a cover plate to constrain a first flow channel and a second flow channel for diverting water in the pump casing. Under its diversion effect, the interference problem of the two water outlets is eliminated, the water flow energy loss is reduced, and the two water outlets can maintain a higher head and a larger water flow rate; the operation of the water pump of the present invention can be completed by relying on only one impeller, the overall structure is simple, and the production cost is reduced; in addition, the present invention maintains an open water flow system, which is convenient for disassembly and cleaning of the water flow system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of an open water pump according to an embodiment of the present invention;

[0030] Figure 2 for Figure 1 A first sectional view (longitudinal section);

[0031] Figure 3 for Figure 1 A second sectional view (longitudinal section) of

[0032] Figure 4 for Figure 1 A second cross-sectional view (transverse section);

[0033] Figure 5 This is a partial structural diagram of an open water pump according to an embodiment of the present invention (the upper part of the pump casing is hidden);

[0034] Figure 6 This is a diagram showing the coordination structure of the cover plate and the splitter blades according to an embodiment of the present invention;

[0035] Figure 7 for Figure 6 Schematic diagram of the structure from another angle;

[0036] Figure 8 This is a schematic structural diagram of the lower half of the pump casing according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0038] like Figures 1 to 8 As shown, the open water pump of this embodiment includes a pump housing 1, a cover plate 2, an impeller 3, and a drive member 9. The pump housing 1 has a water inlet 13 at the bottom, a first water outlet 11 at the top, and a second water outlet 12 at the side. The cover plate 2 is disposed transversely within the pump housing 1 and divides the interior of the pump housing 1 into an upper cavity 101 and a lower cavity 102. The lower cavity 102 is circumferentially formed with a first flow channel 10 and a second flow channel 20 arranged opposite each other and used to pump water out in both directions. The second water outlet 12 is disposed on the side of the lower cavity 102 and communicates with the first flow channel 10. A notch 23 is disposed on the edge of the cover plate 2 for connecting the second flow channel 20 to the upper cavity 101. The first water outlet 11 is communicated with the upper cavity 101. The impeller 3 is rotatably disposed within the lower cavity 102 to provide power for bidirectional water pumping from the first and second flow channels 10 and 20.

[0039] The lower chamber 102 of the pump housing 1 is provided with a first diverter portion 14 and a second diverter portion 15 that spirally extend inwardly from the inner circumferential wall of the pump housing 1. The first diverter portion 14 and the second diverter portion 15 are arranged opposite each other circumferentially around the pump housing 1, with their tips facing the incoming water, thereby forming a diverter end 100. The first and second diverter portions 14, 15 cooperate with the inner wall of the pump housing 1 to form a symmetrically arranged first flow channel 10 and a second flow channel 20 structure that are tangentially connected to the water-drawing area in the center of the lower chamber 102. This improves the diversion and water-drawing effects, reduces fluid energy loss, and increases water flow and head.

[0040] The first flow channel 10 is formed around the first diverter 14, and the second flow channel 20 is formed around the second diverter 15. The water flows out of the first flow channel 10 and the second flow channel 20 in opposite directions. This structure and arrangement facilitates the rational distribution of the flow rates of the first flow channel 10 and the second flow channel 20, thereby increasing the diverted flow rate.

[0041] The portion of the inner bottom wall of the pump housing 1 corresponding to the second flow channel 20 extends upward along the direction of water flow to form a diversion slope 201 for directing water toward the notch 23 of the cover plate 2. Because the water diverted from the second flow channel 20 is directed upward through the first water outlet 11, the provision of the diversion slope 201 improves the water diversion effect, providing a rectifying and guiding effect, preventing fluid turbulence during the transition from circumferential flow to axial flow, thereby reducing energy loss.

[0042] The lower surface of the cover plate 2 is provided with vertically extending first and second diverter blades 21, 22. The first diverter blade 21 is arranged close to the outer wall of the first diverter portion 14, with its end extending toward the water inlet 13 along the extension trajectory of its diverter end. The second diverter blade 22 is arranged close to the outer wall of the second diverter portion 15, with its end extending toward the water inlet 13 along the extension trajectory of its diverter end. This structure can bring the water diversion structure closer to the water inlet 13, thereby improving the water diversion effect.

[0043] The second splitter blades 22 are arranged close to the inner edge of the guide slope 201. The outer sidewalls of the second splitter blades 22, the guide slope 201, and the inner sidewall of the pump casing 1 outside the guide slope 201 together enclose the second flow channel 20. This structure not only encloses the second flow channel 20 and increases the depth of the second flow channel 20, but also ensures a reasonable vertical connection between the second flow channel 20 and the notch 23, thereby reducing fluid energy loss.

[0044] The notch 23 includes a first portion 231 and a second portion 232 arranged along the water flow direction. The first portion 231 is located at the end of the second splitter blade 22 and forms the inlet guide area 233 of the second flow channel 20. The second portion 232 is arranged above the second splitter blade 22 and matches the width of the second flow channel 20. This structure of the notch 23 more effectively cooperates with the second flow channel 20, ensuring that the fluid is consistently guided and rectified during the reversing flow process, thereby reducing energy loss.

[0045] The first water outlet 11 is located in the center of the top wall of the pump housing 1. A baffle 24 is provided on the upper surface of the cover plate 2 to direct the water flowing upward through the notch 23 toward the first water outlet 11. This structure squeezes the water flowing upward through the second flow channel 20 while also guiding this flow to reduce energy loss.

[0046] The top edge of the baffle 24 contacts the inner top wall of the pump casing 1 to enclose a converging flow channel 240. The converging flow channel 240 includes a semi-enclosed converging area 2401 arranged around the first water outlet 11 and a guide area 2402 whose width gradually increases from the opening of the converging area 2401 to the inner wall of the pump casing 1. The guide area 2402 surrounds the gap 23.

[0047] Baffle 24 includes an arcuate segment 241 for defining a semi-enclosed flow converging area 2401, a first curved segment 242 extending from the first end of arcuate segment 241 toward the inner sidewall of pump casing 1, and a second curved segment 243 extending from the second end of arcuate segment 241 toward the inner sidewall of pump casing 1. First curved segment 242 is positioned corresponding to the edge of notch 23 at the entrance of second flow channel 20, while second curved segment 243 is positioned corresponding to and outside the end of second flow channel 20. This structure constrains the positional arrangement of converging flow channel 240, notch 23, and second flow channel 20, further reducing energy loss and increasing water pressure.

[0048] The upper surface of the cover plate 2 is provided with a diversion member 25 located within the semi-enclosed flow-gathering area 2401 and used to divert water toward the first water outlet 11. The diversion member 25 is formed into a conical structure that gradually extends upward from the edge of the semi-enclosed flow-gathering area 2401 toward the center. The inner wall surface of the pump housing 1 corresponding to the upper cavity 101 extends radially outward and inward, from bottom to top, to form a curved diversion structure 16 that matches the outer surface of the conical structure. The curved diversion structure 16 and the conical structure together enclose a diversion channel 140, the lower end of which connects with the notch 23 at the upper end of the second flow channel 20 and the upper end smoothly connects with the first water outlet 11. This structure helps further reduce energy loss and increase water pressure.

[0049] The impeller 3 is a centrifugal impeller with a water inlet 31 at the bottom and a water outlet 32 at the side. The ends of the first and second splitter blades 21, 22 are located near the edge of the impeller 3 and corresponding to the water outlet 32 of the impeller 3. The inner walls of the first and second splitter blades 21, 22 cooperate with the impeller 3 to pressurize the circumferentially flowing water. Simultaneously, during the circumferential flow of the water, the ends of the first and second splitter blades 21, 22 can divert the water flow while minimizing energy loss.

[0050] The bottom of the impeller 3 extends radially from the outside to the inside and from the top to the bottom to form a downward-probing water inlet 31. Correspondingly, a portion of the bottom wall of the pump casing 1 extends radially from the outside to the inside and from the top to the bottom to form a downward-probing water suction port 13 that matches the water inlet 31. This structure lowers the water pump suction port 13, which is beneficial for improving water suction and return efficiency and preventing gas inhalation.

[0051] The driving member 9 is a motor, which is arranged under the pump housing 1. The motor shaft passes through the water suction port 13 upward and is connected to the impeller 3 to drive the impeller 3 to rotate.

[0052] The cleaning machine of this embodiment includes a box body, a first spray arm 8 and a second spray arm, and also includes the above-mentioned open water pump. A concave return water area is provided at the bottom of the box body, and the top of the return water area is covered with a filter plate. The pump housing 1 is provided in the return water area. There is a water suction gap 90 between the water suction port 13 at the bottom of the pump housing 1 and the bottom of the return water area. The first water outlet 11 at the top of the pump housing 1 is located above the filter plate and is connected to the water inlet of the first spray arm. The second spray arm is provided in the upper middle part of the box body and is connected to the second water outlet 12 of the pump housing 1 through a water supply pipe.

[0053] In this embodiment, the cover plate 2 is used to constrain the first flow channel 10 and the second flow channel 20 for diverting water in the pump casing 1. Under the diversion effect, the interference problem of the two water outlets is eliminated, the energy loss of the water flow is reduced, and the water outlets in both directions can maintain a high head and a large water flow rate; the operation of the water pump in this embodiment can be completed by relying on only one impeller 3, the overall structure is simple, and the production cost is reduced; in addition, this embodiment maintains an open water flow system, which is convenient for disassembly and cleaning of the water flow system.

[0054] In the present specification and claims, directional terms such as "front," "back," "up," "down," "left," "right," "side," "top," and "bottom" are used to describe various exemplary structural parts and components of the present invention. However, these terms are used herein for convenience of description only and are based on the exemplary orientations shown in the accompanying drawings. Because the embodiments disclosed herein can be arranged in various orientations, these directional terms are intended for illustrative purposes only and should not be construed as limiting. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. An open water pump, characterized in that include: The pump housing (1) has a water inlet (13) at the bottom, a first water outlet (11) at the top, and a second water outlet (12) at the side. A cover plate (2) is provided in the pump housing (1) and divides the inner cavity of the pump housing (1) into an upper cavity (101) and a lower cavity (102); a first flow channel (10) and a second flow channel (20) are formed on the circumference of the lower cavity (102) and are arranged opposite to each other and used for pumping water out in two directions; the second water outlet is provided on the side of the lower cavity (102) and is connected to the first flow channel (10); a notch (23) is provided on the edge of the cover plate (2) for connecting the second flow channel (20) with the upper cavity (101); and the first water outlet (11) is connected to the upper cavity (101); The impeller (3) is rotatably disposed in the lower cavity (102) and is used to provide power for bidirectional water pumping.

2. The open water pump according to claim 1, characterized in that: A first diversion portion (14) and a second diversion portion (15) are provided in the lower cavity (102) of the pump housing (1), and the first diversion portion (14) and the second diversion portion (15) are spirally extended inwardly along the circumferential direction from the inner peripheral wall of the pump housing (1). The first diversion portion (14) and the second diversion portion (15) are arranged opposite to each other in the circumferential direction of the pump housing (1), and the tips thereof are directed toward the direction of incoming water, thereby forming a diversion end (100).

3. The open water pump according to claim 2, characterized in that: The first flow channel (10) is formed on the periphery of the first diversion portion (14), and the second flow channel (20) is formed on the periphery of the second diversion portion (15), and the water outlet directions of the first flow channel (10) and the second flow channel (20) are opposite.

4. The open water pump according to claim 3, characterized in that: The portion of the inner bottom wall of the pump housing (1) corresponding to the second flow channel (20) extends from bottom to top along the direction of water flow to form a diversion slope (201) for guiding the water flow toward the notch (23) of the cover plate (2).

5. The open water pump according to claim 4, characterized in that: The lower surface of the cover plate (2) is provided with a first splitter blade (21) and a second splitter blade (22) extending vertically. The first splitter blade (21) is arranged close to the outer wall of the first splitter portion (14) and its end portion extends toward the water suction port (13) along the extension trajectory of its splitter end (100). The second splitter blade (22) is arranged close to the outer wall of the second splitter portion (15) and its end portion extends toward the water suction port (13) along the extension trajectory of its splitter end (100).

6. The open water pump according to claim 5, characterized in that: The second splitter blade (22) is arranged close to the inner edge of the guide slope (201), and the outer side wall of the second splitter blade (22), the guide slope (201), and the inner side wall of the pump casing (1) outside the guide slope (201) together enclose the second flow channel (20).

7. The open water pump according to claim 6, characterized in that: The notch (23) comprises a first portion (231) and a second portion (232) arranged along the water flow direction; the first portion (231) is located at the end of the second splitter blade (22) and constitutes an inlet guide area (233) of the second flow channel (20); the second portion (232) is arranged above the second splitter blade (22) and matches the width of the second flow channel (20).

8. The open water pump according to claim 5, characterized in that: The first water outlet (11) is opened at the central part of the top wall of the pump housing (1), and the upper surface of the cover plate (2) is provided with a baffle (24) for collecting water flowing upward through the notch (23) to the first water outlet (11).

9. The open water pump according to claim 8, characterized in that: The top edge of the baffle (24) contacts the inner top wall of the pump casing (1) to enclose a converging flow channel (240), and the converging flow channel (240) includes a semi-enclosed converging area (2401) arranged around the first water outlet (11) and a guide area (2402) whose width gradually increases from the opening of the semi-enclosed converging area to the inner wall of the pump casing (1), and the guide area (2402) surrounds the notch (23).

10. The open water pump according to claim 9, characterized in that: The baffle (24) comprises an arc segment (241) for constraining a semi-enclosed flow-gathering area (2401), a first curved segment (242) extending from a first end of the arc segment (241) toward an inner wall of the pump casing (1), and a second curved segment (243) extending from a second end of the arc segment (241) toward an inner wall of the pump casing (1), wherein the first curved segment (242) is arranged corresponding to an edge of the notch (23) at an inlet of the second flow channel (20), and the second curved segment (243) is arranged corresponding to an end of the second flow channel (20) and is located outside the end of the second flow channel (20).

11. The open water pump according to claim 9, characterized in that: The upper surface of the cover plate (2) is provided with a guide member (25) located within the semi-enclosed flow-gathering area (2401) and used to guide water to the first water outlet (11). The guide member (25) is formed into a conical structure that gradually extends upward from the edge of the semi-enclosed flow-gathering area (2401) to the center.

12. The open water pump according to claim 11, characterized in that: The inner wall surface of the pump housing (1) corresponding to the upper cavity (101) extends radially from the outside to the inside and from the bottom to the top to form a curved guide structure (16) that matches the outer surface of the conical structure. The curved guide structure (16) and the conical structure together enclose a guide channel (140) whose lower end is connected to the notch (23) at the upper end of the second flow channel (20) and whose upper end is smoothly connected to the first water outlet (11).

13. The open water pump according to claim 5, characterized in that: The impeller (3) is a centrifugal impeller (3) having a water inlet (31) at the bottom and a water outlet (32) at the side, and the ends of the first splitter blade (21) and the second splitter blade (22) are both close to the edge of the impeller (3) and arranged corresponding to the water outlet (32) of the impeller (3).

14. The open water pump according to any one of claims 1 to 13, characterized in that: The bottom of the impeller (3) extends radially from the outside to the inside and from the top to the bottom to form a downward-probing water inlet (31). Correspondingly, at least a portion of the bottom wall of the pump casing (1) extends radially from the outside to the inside and from the top to the bottom to form a downward-probing water suction port (13) matching the water inlet (31).

15. A cleaning machine comprising a housing, a first spray arm and a second spray arm, characterized in that: It also includes an open water pump according to any one of claims 1 to 14, wherein a concave return water area is provided at the bottom of the box body, and the top of the return water area is covered with a filter plate, the pump housing (1) is provided in the return water area, and a water suction gap is provided between the water suction port (13) at the bottom of the pump housing (1) and the bottom of the return water area, the first water outlet (11) at the top of the pump housing (1) is located above the filter plate and is connected to the water inlet of the first spray arm, and the second spray arm is provided in the upper middle part of the box body and is connected to the second water outlet of the pump housing (1) through a water supply pipe.

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