Self-foam water flow system and cleaning machine, cleaning method

Abstract

The present application relates to a self-defoaming water flow system and a cleaning machine and a cleaning method, comprising a water pumping mechanism arranged in a box of the cleaning machine and supported on the bottom of the box, a driving element arranged outside the box for providing power for the water pumping mechanism, a backwater opening provided at the bottom of the water pumping mechanism, the opening degree of the backwater opening increasing with the increase of water pressure and decreasing with the decrease of water pressure, and the opening degree of the backwater opening decreasing with the increase of the amount of bubbles in the water flow when the opening degree of the backwater opening is at the maximum state and the power of the driving element is at the maximum state. The present application automatically balances the opening degree of the backwater opening through the real-time density of the water flow, maintains the stability of the flow state of the water flow in the water pumping mechanism without changing the power and sacrificing the water flow, the stable water flow state helps to reduce or even eliminate the bubbles in the water flow, and the water flow system is automatically maintained in a stable state through the balance of water pressure, at this time, although the water flow of the spray arm is reduced, but it can still maintain high spray lift and high spray water pressure, thereby achieving good cleaning effect.

Description

Technical Field

[0001] This invention relates to the field of dishwasher technology, specifically to a self-defoaming water flow system, a cleaning machine, and a cleaning method. Background Technology

[0002] As people's living standards improve, dishwashers are gradually becoming a common appliance in the kitchen.

[0003] Currently, dishwashers mainly use two types of water flow systems: open and closed. In an open water flow system, the water pump is located inside the washing chamber and is directly connected to it. In a closed water flow system, the water pump is located outside the washing chamber but is connected to it via a pipe. Open water flow systems have a significant advantage in pump performance because they shorten the return water travel distance, thus reducing fluid energy loss.

[0004] The applicant's prior patent ZL 201310749864.9, "Tank-type Washing Machine," discloses a washing machine employing an open water flow system. The machine includes a tank body forming a washing space. The tank body has a recessed section at least in the center. A drain plate with the same shape as the recessed section covers the recessed section. The drain plate has multiple drain holes for draining water. The space between the recessed section and the drain plate forms a draining area. The drain plate is flush with the rest of the bottom of the tank body. A pump is provided within the draining area to pump water from the draining area to the top of the drain plate.

[0005] The aforementioned structure places the water pump within the drain area of ​​the sink, resulting in good water replenishment. However, since the pump's suction area is a constant, it can only provide a constant flow rate for the dishwasher to clean dishes. During the washing process, contaminants such as eggs and detergent on the dishes easily create foam. As the water flow foams, the liquid density of the water-vapor mixture decreases, resulting in a reduction in motor power. To maintain a constant high power, current technology typically increases the motor speed. The increased motor speed further exacerbates foaming. When the motor speed reaches its maximum set value, the further deterioration of foaming leads to a further decrease in liquid density, resulting in a further reduction in power. Consequently, the pumped water head becomes significantly insufficient, weakening the impact on the dish surface and affecting the cleaning effect. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide a self-defoaming water flow system that can automatically defoam without changing the power, thereby balancing the water flow head and impact force and maintaining a high cleaning effect, in light of the current state of the prior art.

[0007] The second technical problem to be solved by the present invention is to provide a cleaning machine that has the above-mentioned self-defoaming water flow system, in view of the current state of the prior art.

[0008] The third technical problem to be solved by the present invention is to provide a cleaning method for the above-mentioned cleaning machine in light of the current state of the prior art.

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

[0010] A self-defoaming water flow system includes a water pump mechanism located in the housing of a cleaning machine and supported at the bottom of the housing. A spray arm is connected to the water pump mechanism. A drive unit for providing power to the water pump mechanism is provided outside the housing. The bottom of the water pump mechanism has a return water port whose opening increases with increasing water pressure and decreases with decreasing water pressure. When the opening of the return water port is at its maximum and the drive unit is at its maximum power, the opening of the return water port further decreases as the amount of air bubbles in the water flow increases.

[0011] In this invention, the power of the drive component is precisely maintained at the maximum opening of the return inlet. With the power of the drive component remaining constant, as the amount of air bubbles in the water flow increases, the water flow density decreases, the pressure within the pumping mechanism decreases, the opening of the return inlet gradually decreases, the amount of water pumped into the pumping mechanism per unit time decreases, the amount of water sprayed by the spray arm decreases, the water flow state within the pumping mechanism gradually stabilizes, the degree of water flow agitation within the pumping mechanism weakens, and the amount of air bubbles in the water flow gradually decreases. This invention automatically balances the opening of the return inlet based on the real-time density of the water flow, thereby maintaining a stable water flow state within the pumping mechanism while sacrificing water flow rate. A stable water flow state helps reduce or even eliminate air bubbles in the water flow, and automatically maintains the water flow system in a stable state by balancing water pressure. At this time, although the spray water flow rate of the spray arm decreases, it can still maintain a high spray head and high spray water pressure, thus achieving a good cleaning effect.

[0012] Preferably, the pumping mechanism includes a pump casing, which comprises an upper casing and a lower casing that can be interlocked to enclose a pump chamber. The lower casing has a suction port at its bottom, and a support edge extending downwards and supported on the bottom wall of the casing is provided at the bottom edge of the lower casing. The return port is located on this support edge. The upper casing is vertically constrained above the lower casing, and the edge of the upper casing has a surrounding edge that can seal the return port when it sinks under its own weight and open it when it floats under hydraulic pressure. With this structure, the opening of the return port can be automatically adjusted according to the water pressure within the pumping mechanism, eliminating the problems of spray arm swaying and jamming caused by unstable water flow velocity.

[0013] Preferably, the lower housing includes a first horizontal portion and a supporting edge extending downward from the edge of the first horizontal portion. The water inlet is located at the center of the first horizontal portion. The upper housing includes an annular second horizontal portion corresponding to the first horizontal portion. The surrounding edge extends downward from the outer edge of the second horizontal portion and is arranged around the supporting edge. An upwardly extending cylinder is provided at the inner edge of the second horizontal portion. The top of the cylinder gradually converges radially towards the center to form the water outlet. The cylinder and the upper surface of the first horizontal portion together enclose the pump chamber. This structure facilitates relative floating between the upper and lower housings.

[0014] To facilitate the connection between the spray arm and the pumping mechanism, the edge of the outlet extends upward to form an outlet sleeve, which is detachably connected to the inlet at the bottom of the spray arm.

[0015] Preferably, the upper surface of the first horizontal portion is provided with an upwardly extending limiting post, and correspondingly, the second horizontal portion has a limiting opening for the limiting post to pass through. The top of the limiting post is provided with a limiting part that can limit the upper shell after it floats. The limiting distance of the limiting post on the upper shell is basically the same as the height of the return water inlet, to ensure smooth opening and closing of the return water inlet.

[0016] Preferably, the upper surface of the first horizontal portion is recessed at its outer edge to form a receiving groove, in which a sealing ring is embedded that can contact and seal with the inner surface of the upper housing after the upper housing sinks.

[0017] In this invention, the pumping mechanism includes a spatial guide vane, an impeller, and a pump casing. The spatial guide vane includes a cover plate and guide vanes. The cover plate is horizontally disposed in the middle of the pump casing and divides the inner cavity of the pump casing into a relatively independent upper cavity and a lower cavity. The outlet is connected to the upper cavity. There are multiple guide vanes arranged vertically on the lower surface of the cover plate. The multiple guide vanes cover the circumferential area of ​​the cover plate and are arranged at intervals along the circumference. The guide vanes extend spirally inward from the edge of the cover plate against the direction of water flow. A flow channel is constrained between two adjacent guide vanes. The cover plate portion corresponding to the top of the guide vane is at least partially missing to form a gap for the flow channel to connect with the upper cavity. The impeller is rotatably disposed in the lower cavity. The bottom of the impeller has an inlet corresponding to the suction port and the side has an outlet corresponding to the gap. This invention incorporates a spatial guide vane and impeller within the pump casing to guide and pressurize axially incoming water before axially outputting it, thus meeting water pressure requirements. Furthermore, the spray arm is mounted on the pump casing without needing to engage with the impeller, improving the stability of the water flow entering the spray arm and consequently enhancing its rotational stability. Simultaneously, since the impeller no longer engages with the spray arm's inlet, the water pressure at the inlet is stabilized, preventing gas intake and water leakage issues.

[0018] Preferably, the return water inlet is equipped with a puncture device for defoaming. This structure can improve the defoaming effect by cooperating with the self-adjustment of the return water inlet opening.

[0019] Preferably, the puncturing element is movably disposed within the support edge, moving upwards to hide within the support edge above the return water inlet and downwards to extend into the return water inlet. A driving body is provided within the surrounding edge, capable of moving the puncturing element up and down with the vertical movement of the upper shell. The driving body is a first magnetic element, and the puncturing element is a second magnetic element. The first magnetic element is embedded in the surrounding edge, and a cavity extending upwards from the top edge of the return water inlet is provided within the support edge. The second magnetic element is movably constrained within this cavity. With this structure, the puncturing element can be withdrawn from the return water inlet without affecting the return water efficiency when defoaming is not required, and can enter the return water inlet to puncture air bubbles when defoaming is required.

[0020] A cleaning machine includes a housing and a spray arm. The bottom of the housing is provided with a recessed return water area. The spray arm is rotatably disposed on the return water area. The machine also includes the aforementioned self-defoaming water flow system. The pump mechanism is disposed in the return water area. The drive unit is disposed on the outer bottom of the housing and the power output shaft passes through the bottom wall of the housing and is connected to the pump mechanism.

[0021] One cleaning method is as follows:

[0022] When the tableware contains easily foaming contaminants, water is introduced into the tank. When the speed of the drive is set to a constant A revolutions / hour, the power of the drive will just keep the opening of the return water outlet at its maximum.

[0023] The power of the drive unit remains constant. As the amount of air bubbles in the water flow increases, the water flow density decreases, the pressure inside the pump mechanism decreases, the opening of the return water port gradually decreases, the amount of water pumped into the pump mechanism per unit time decreases, and the amount of water sprayed out by the spray arm decreases.

[0024] The water flow pattern within the pumping mechanism gradually stabilizes, the degree of agitation of the water flow within the pumping mechanism decreases, and the amount of air bubbles in the water flow gradually decreases. Under the condition of reduced water flow rate, the spray arm maintains a high spray head for the water column.

[0025] When the tableware does not contain easily foaming contaminants and the number of tableware is greater than C sets, water is introduced into the tank. When the rotation speed of the drive component is set to a constant A revolutions per hour, the power of the drive component is just enough to maintain the opening of the return water port at the maximum state. The spray arm maintains a large spray water flow and spray head to clean the tableware.

[0026] When the tableware does not contain easily foaming contaminants and the number of tableware sets is less than or equal to C, water is introduced into the tank, and the rotation speed of the drive component is set to a constant B revolutions per hour, where B < A, and the opening of the return water inlet is maintained in a half-open state; the water inlet volume in the tank is less than the water inlet volume when the drive component rotates at A revolutions per hour, and the spray arm maintains a large spray head to clean the tableware while the spray water flow rate is reduced.

[0027] Compared with the prior art, the advantages of the present invention are as follows: The present invention automatically balances the opening of the return water port by the real-time density of the water flow, thereby maintaining the stability of the water flow state in the pump mechanism without changing the power or sacrificing the water flow rate. The stable water flow state helps to reduce or even eliminate air bubbles in the water flow, and automatically maintains the water flow system in a stable state by balancing the water pressure. At this time, although the spray water flow rate of the spray arm is reduced, it can still maintain a high spray head and high spray water pressure, thereby achieving a good cleaning effect. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0029] Figure 2 for Figure 1 A cross-sectional view (with the return water outlet fully closed);

[0030] Figure 3 for Figure 1 A cross-sectional view (with the return water outlet fully open);

[0031] Figure 4 This is a schematic diagram of the pump casing structure in Embodiment 1 of the present invention;

[0032] Figure 5 for Figure 4 A schematic diagram of the bottom structure;

[0033] Figure 6 for Figure 4 Exploded view;

[0034] Figure 7 This is a schematic diagram of the spatial guide vane in Embodiment 1 of the present invention;

[0035] Figure 8 for Figure 7 A schematic diagram of the bottom structure;

[0036] Figure 9 This is a schematic diagram of the structure of Embodiment 2 of the present invention (with the return water inlet in a half-open state). Detailed Implementation

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

[0038] Example 1:

[0039] like Figures 1-8 As shown, the self-defoaming water flow system of this embodiment includes a water pumping mechanism located in the housing 01 of the cleaning machine and supported at the bottom of the housing 01. A spray arm 02 is connected to the water pumping mechanism. A drive unit 5 for providing power to the water pumping mechanism is provided outside the housing 01. A return water port 131 is opened at the bottom of the water pumping mechanism, which increases in opening degree with increasing water pressure and decreases in opening degree with decreasing water pressure. When the opening degree of the return water port 131 is at its maximum and the drive unit 5 is at its maximum power, the opening degree of the return water port 131 further decreases as the amount of air bubbles in the water flow increases.

[0040] In this embodiment, when the power of the drive unit 5 is just enough to maintain the opening of the return port 131 at its maximum, the power of the drive unit 5 remains unchanged. As the amount of air bubbles in the water flow increases, the water flow density decreases, the pressure inside the pumping mechanism decreases, the opening of the return port 131 gradually decreases, the amount of water pumped into the pumping mechanism per unit time decreases, the amount of water sprayed out by the spray arm 02 decreases, the water flow state inside the pumping mechanism gradually becomes stable, the degree of water flow agitation in the pumping mechanism weakens, and the amount of air bubbles in the water flow gradually decreases.

[0041] Specifically, the pumping mechanism includes a spatial guide vane A, an impeller 3, and a pump casing 1. The spatial guide vane A and the impeller 3 are located in the pump casing 1 and are used to draw water from bottom to top.

[0042] The pump casing 1 includes an upper casing 14 and a lower casing 15 that can be fastened together to enclose the pump chamber 10. The lower casing 15 has a suction port 11 at its bottom. A support edge 13 extends downwards and is supported on the inner bottom wall of the housing 01 at the bottom edge of the lower casing 15. A return port 131 is located on this support edge 13. The upper casing 14 is vertically constrained above the lower casing 15. The support edge 13 is located at the bottom edge of the lower casing 15. The edge of the upper casing 14 has a surrounding edge 141 that seals the return port 131 when it sinks under its own weight and opens it when it floats up in the water. With this structure, the opening degree of the return port 131 can be automatically adjusted according to the water pressure within the pump mechanism, eliminating the problems of spray arm swaying and jamming caused by unstable water flow velocity.

[0043] The lower housing 15 includes a first horizontal portion 151 and a supporting edge 13 extending downward from the edge of the first horizontal portion 151. A water inlet 11 is located at the center of the first horizontal portion 151. The upper housing 14 includes an annular second horizontal portion 142 corresponding to the first horizontal portion 151. A surrounding edge 141 extends downward from the outer edge of the second horizontal portion 142 and is arranged around the supporting edge 13. An upwardly extending cylindrical body 143 is provided at the inner edge of the second horizontal portion 142. The top of the cylindrical body 143 gradually converges radially towards the center to form a water outlet 12. The cylindrical body 143 and the upper surface of the first horizontal portion 151 together enclose the pump chamber 10. This structure facilitates relative floating between the upper housing 14 and the lower housing 15.

[0044] To facilitate the connection between the spray arm 02 and the pump mechanism, the edge of the outlet 12 extends upward to form an outlet sleeve 121, which is detachably connected to the inlet at the bottom of the spray arm 02 via a snap-fit ​​structure.

[0045] The upper surface of the first horizontal section 151 is provided with an upwardly extending limiting post 152. Correspondingly, the second horizontal section 142 has a limiting opening 1421 for the limiting post 152 to pass through. The top of the limiting post 152 is provided with a limiting part 1521 that can limit the upper housing 14 after it floats. The limiting distance of the limiting post 152 on the upper housing 14 is basically the same as the height of the return water port 131 to ensure smooth opening and closing of the return water port 131.

[0046] The upper surface of the first horizontal portion 151 is recessed at its outer edge to form a receiving groove 1522, in which a sealing ring 6 is embedded, which can contact and seal with the inner surface of the upper housing 14 after the upper housing 14 is sunk.

[0047] In this embodiment, the spatial guide vane A includes a cover plate 2 and guide vanes 21. The cover plate 2 is horizontally disposed in the middle of the pump casing 1 and divides the inner cavity of the pump casing 1 into a relatively independent upper cavity 101 and a lower cavity 102. The outlet 12 is connected to the upper cavity 101. There are multiple guide vanes 21 and they are arranged vertically on the lower surface of the cover plate 2. The multiple guide vanes 21 cover the circumferential area of ​​the cover plate 2 and are arranged at intervals along the circumferential direction. The guide vanes 21 extend spirally from the edge of the cover plate 2 inward against the direction of water flow. A guide channel 23 is constrained between two adjacent guide vanes 21. The part of the cover plate 2 corresponding to the top of the guide vane 21 is at least partially missing to form a gap 24 for the guide channel 23 to connect with the upper cavity 101. The impeller 3 is rotatably disposed in the lower cavity 102. The impeller 3 is a centrifugal impeller. In this embodiment, a spatial guide vane and impeller are provided in the pump casing to guide and pressurize axially incoming water through circumferential means before axially outputting it, in order to meet the water pressure requirements. Based on this, the spray arm is set on the pump casing without needing to cooperate with the impeller, which improves the stability of the water flow entering the spray arm and thus improves the rotational stability of the spray arm. At the same time, since the impeller no longer corresponds to the water inlet of the spray arm, the water pressure at the water inlet of the spray arm is stabilized, avoiding the problems of gas intake and water leakage.

[0048] The suction port 11 is located on the bottom wall of the pump casing 1. The bottom wall of the pump casing 1 surrounding the suction port 11 extends radially from the outside to the inside and from top to bottom to form a first guide surface 111. The suction port 11 is located at the lowest end of the first guide surface 111, thus forming a downward-protruding suction port 11. This structure is beneficial for further improving the water suction efficiency and rectifying and guiding the water entering the suction port, thereby reducing energy loss.

[0049] The outer ends of the guide vanes 21 are arranged close to the inner circumferential wall of the pump casing 1 and close to the edge of the impeller 3. In two adjacent guide vanes 21, the outer end portion of the first guide vane 21 and the inner end portion of the second guide vane 21 are staggered to enclose the guide channel 23. The cover plate 2 is missing from the corresponding outer end of the first guide vane 21 to the outer end of the second guide vane 21, forming a gap 24. This structure allows the gap to be properly connected to the outlet end of the guide channel, reducing energy loss.

[0050] The outlet 12 is located in the center of the top wall of the pump casing 1. The upper surface of the cover plate 2 is provided with a converging vane 25 that spirals from the edge to the center to gather the water flow delivered through the notch 24 to the outlet 12. This structure can rectify and guide the water flow entering the upper cavity, avoid energy loss caused by water flow turbulence, and improve water pressure and head.

[0051] The upper surface of the cover plate 2 is provided with a guide cone 26 that gradually extends upward from the edge to the center, and the tip of the guide cone 26 is arranged corresponding to the outlet 12. Multiple converging vanes 25 are arranged at intervals around the cover plate 2, and the bottom edge of the converging vanes 25 is located on the upper surface of the guide cone 26. This structure can rectify and guide the water flow entering the upper cavity, avoid energy loss caused by water flow turbulence, and improve water pressure and head.

[0052] The cleaning machine of this embodiment includes a housing 01 and a spray arm 02. The bottom of the housing 01 is provided with a recessed return water area 011. The spray arm 02 is rotatably mounted on the return water area 011. It also includes the aforementioned self-defoaming water flow system. The water pumping mechanism is located in the return water area 011. The driving component 5 is a motor, which is located at the bottom of the housing 01 and the power output shaft passes through the bottom wall of the housing 01 and is connected to the impeller 3 of the water pumping mechanism.

[0053] The cleaning method in this embodiment is as follows:

[0054] When the tableware contains easily foaming contaminants, water is introduced into the tank 01. When the rotation speed of the drive component 5 is set to a constant 3000 rpm, the power of the drive component 5 is just enough to keep the opening of the return water outlet 131 at its maximum.

[0055] The power of the drive unit 5 remains unchanged. As the amount of air bubbles in the water flow increases, the water flow density decreases, the pressure inside the pump mechanism decreases, the opening of the return port 131 gradually decreases, the amount of water pumped into the pump mechanism per unit time decreases, and the amount of water sprayed out by the spray arm 02 decreases.

[0056] As the water flow pattern within the pump mechanism gradually stabilizes, the degree of agitation of the water flow within the pump mechanism weakens, and the amount of air bubbles in the water flow gradually decreases. Under the condition of reduced spray water flow, the spray arm 02 maintains a high spray head of the water column.

[0057] When the tableware does not contain easily foaming contaminants and the number of tableware is greater than C sets, water is introduced into the tank 01. When the speed of the drive component 5 is set to a constant 3000 rpm, the power of the drive component 5 is just enough to keep the opening of the return water port 131 at its maximum. The spray arm 02 maintains a large spray water flow and spray head to clean the tableware.

[0058] When the tableware does not contain easily foaming contaminants and the number of tableware is less than or equal to C sets, water is introduced into the tank 01, the speed of the drive component 5 is set to a constant 2000 rpm, and the opening of the return water port 131 is kept in a half-open state; the water inlet in the tank 01 is less than the water inlet when the speed of the drive component 5 is 3000 rpm, and the spray arm 02 maintains a large spray head to clean the tableware under the condition of reduced spray water flow.

[0059] In this embodiment, the opening of the return water inlet 131 is automatically balanced by the real-time density of the water flow, thereby maintaining the stability of the water flow state in the pump mechanism without changing the power or sacrificing the water flow rate. The stable water flow state helps to reduce or even eliminate air bubbles in the water flow, and automatically maintains the water flow system in a stable state by balancing the water pressure. At this time, although the spray water flow rate of the spray arm is reduced, it can still maintain a high spray head and high spray water pressure, thereby achieving a good cleaning effect.

[0060] Example 2:

[0061] The difference between this embodiment and Embodiment 1 is that:

[0062] like Figure 9 As shown, a puncture element 7 for defoaming is provided at the return water inlet 131. This structure can improve the defoaming effect by adjusting the opening degree of the return water inlet 131.

[0063] The puncturing element 7 is movably disposed within the support edge 13. It can move upwards to be hidden within the support edge 13 above the return water inlet 131, and downwards to extend into the return water inlet 131. A driving body 71 is disposed within the surrounding edge 141, capable of moving the puncturing element 7 up and down with the floating of the upper housing 14. The driving body 71 is a first magnetic element, and the puncturing element 7 is plate-shaped with serrated edges at the bottom, serving as a second magnetic element. The first magnetic element is embedded in the surrounding edge 141. A cavity 132 extending upwards from the top edge of the return water inlet 131 is provided within the support edge 13, and the second magnetic element is movably constrained within this cavity 132. With this structure, the puncturing element 7 can be withdrawn from the return water inlet 131 without affecting the return water efficiency when defoaming is not required, and can enter the return water inlet 131 to puncture air bubbles when defoaming is required.

[0064] The specification and claims of this invention use terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," to describe various exemplary structural parts and elements of the invention. However, these terms are used herein merely for ease of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A self-foam water flow system, comprising a pump water mechanism arranged in a tank (01) of a cleaning machine and supported on the bottom of the tank (01), a spray arm (02) being connected above the pump water mechanism, a driving member (5) for providing power for the pump water mechanism being arranged outside the tank (01), characterized in that: The pump mechanism has a return water inlet (131) at the bottom that increases in opening degree with increasing water pressure and decreases in opening degree with decreasing water pressure; the pump mechanism includes a pump housing (1), the pump housing (1) includes an upper housing (14) and a lower housing (15) that can be fastened together to enclose the pump chamber (10), the lower housing (15) has a suction port (11) at the bottom, the lower housing (15) has a support side (13) that extends downward and is supported on the bottom wall of the box (01) at the bottom edge, the return water inlet (131) is opened on the support side (13), the upper housing (14) can float up and down and is constrained above the lower housing (15), the upper housing (14) has a surrounding edge (141) that can seal the return water inlet (131) when it sinks under its own weight and open the return water inlet (131) when it floats up under the action of water force; When the opening of the return port (131) is at its maximum and the power of the drive (5) remains constant, the opening of the return port (131) further decreases as the amount of air bubbles in the water flow increases; when the power of the drive (5) just maintains the opening of the return port (131) at its maximum, the power of the drive (5) remains constant, as the amount of air bubbles in the water flow increases, the water flow density decreases, the pressure in the pumping mechanism decreases, the opening of the return port (131) gradually decreases, the amount of water pumped into the pumping mechanism per unit time decreases, the amount of water sprayed by the spray arm (02) decreases, the water flow state in the pumping mechanism gradually becomes stable, the degree of water flow agitation in the pumping mechanism weakens, and the amount of air bubbles in the water flow gradually decreases.

2. The self-defoaming water flow system according to claim 1, characterized in that: The lower housing (15) includes a first horizontal portion (151) and a support edge (13) extending downward from the edge of the first horizontal portion (151). The water inlet (11) is located in the center of the first horizontal portion (151). The upper housing (14) includes an annular second horizontal portion (142) arranged corresponding to the first horizontal portion (151). The surrounding edge (141) extends downward from the outer edge of the second horizontal portion (142) and is arranged around the support edge (13). An upwardly extending cylinder (143) is provided at the inner edge of the second horizontal portion (142). The top of the cylinder (143) gradually converges radially towards the center to form a water outlet (12). The cylinder (143) and the upper surface of the first horizontal portion (151) together enclose the pump chamber (10).

3. The self-defoaming water flow system according to claim 2, characterized in that: The edge of the outlet (12) extends upward to form an outlet sleeve (121), which is detachably connected to the inlet at the bottom of the spray arm (02).

4. The self-defoaming water flow system according to claim 2, characterized in that: The upper surface of the first horizontal portion (151) is provided with an upwardly extending limiting post (152). Correspondingly, the second horizontal portion (142) has a limiting opening (1421) for the limiting post (152) to pass through. The top of the limiting post (152) is provided with a limiting part (1521) that can limit the upper shell (14) after it floats up.

5. The self-defoaming water flow system according to claim 2, characterized in that: The upper surface of the first horizontal portion (151) is recessed at its outer edge to form a receiving groove (1522), in which a sealing ring (6) is embedded, which can contact and seal with the inner surface of the upper housing (14) after the upper housing (14) is sunk.

6. The self-defoaming water flow system according to claim 2, characterized in that: The pumping mechanism includes a spatial guide vane (A), an impeller (3), and the pump casing. The spatial guide vane (A) includes a cover plate (2) and guide vanes (21). The cover plate (2) is horizontally positioned in the middle of the pump casing (1) and divides the inner cavity of the pump casing (1) into a relatively independent upper cavity (101) and a lower cavity (102). The outlet (12) is connected to the upper cavity (101). There are multiple guide vanes (21) arranged vertically on the lower surface of the cover plate (2). The multiple guide vanes (21) cover the circumferential area of ​​the cover plate (2) and are arranged at intervals along the circumferential direction. The guide vane (21) extends spirally inward from the edge of the cover plate (2) against the direction of water flow. A guide channel (23) is constrained between two adjacent guide vanes (21). At least part of the cover plate (2) corresponding to the top of the guide vane (21) is missing to form a notch (24) for the guide channel (23) to communicate with the upper cavity (101). The impeller (3) is rotatably disposed in the lower cavity (102). The bottom of the impeller (3) has an inlet (31) arranged corresponding to the suction port (11), and the side has an outlet (32) arranged corresponding to the notch (24).

7. The self-defoaming water flow system according to any one of claims 1 to 6, characterized in that: The return water inlet (131) is provided with a puncture device (7) for defoaming.

8. The self-defoaming water flow system according to claim 7, characterized in that: The puncturing element (7) is movable up and down in the support side (13), moving upward to hide in the support side (13) above the return water port (131) and moving downward to extend into the return water port (131). The surrounding edge (141) is provided with a driving body (71) that can move the puncturing element (7) up and down with the up and down floating of the upper shell (14).

9. The self-defoaming water flow system according to claim 8, characterized in that: The driving body (71) is a first magnetic component, and the piercing component (7) is a second magnetic component. The first magnetic component is embedded in the surrounding edge (141), and the supporting edge (13) is provided with a cavity (132) extending upward from the top edge of the return water port (131). The second magnetic component is constrained in the cavity (132) by moving up and down.

10. A cleaning machine, comprising a housing (01) and a spray arm (02), wherein the bottom of the housing (01) is provided with a recessed return water area (011), and the spray arm (02) is rotatably disposed on the return water area (011), characterized in that: It also includes a self-defoaming water flow system according to any one of claims 1 to 9, wherein the pumping mechanism is located in the return water area (011), and the driving member (5) is located at the bottom of the housing (01) and the power output shaft passes through the bottom wall of the housing (01) and is connected to the pumping mechanism.

11. A cleaning method, characterized in that: Using the cleaning machine as described in claim 10, When the tableware contains contaminants that are prone to foaming, water is introduced into the tank (01), and the rotation speed of the drive unit (5) is set to a constant A revolutions / hour. The power of the drive unit (5) is just enough to keep the opening of the return water inlet (131) at its maximum. The power of the drive unit (5) remains unchanged. As the amount of air bubbles in the water flow increases, the water flow density decreases. The pressure inside the pumping mechanism decreases, the opening of the return port gradually decreases, the amount of water pumped into the pumping mechanism per unit time decreases, and the amount of water sprayed out by the spray arm (02) decreases. The water flow in the pump mechanism gradually becomes stable, the degree of agitation of the water flow in the pump mechanism is reduced, and the amount of air bubbles in the water flow gradually decreases. The spray arm (02) maintains a high spray head of the water column under the condition of reduced spray water flow.

12. The cleaning method according to claim 11, characterized in that: When the tableware does not contain easily foaming contaminants and the number of tableware is greater than C sets, water is introduced into the box (01). When the rotation speed of the drive component (5) is set to a constant A revolutions / hour, the power of the drive component (5) just keeps the opening of the return water port (131) at its maximum. The spray arm (02) maintains a large spray water flow and spray head to clean the tableware.

13. The cleaning method according to claim 11, characterized in that: When the tableware does not contain easily foaming contaminants and the number of tableware is less than or equal to C sets, water is introduced into the box (01), the rotation speed of the drive (5) is set to a constant B revolutions / hour, B < A, and the opening of the return water port (131) is maintained in a half-open state; the water inlet in the box (01) is less than the water inlet when the rotation speed of the drive is A revolutions / hour, and the spray arm (02) maintains a large spray head to clean the tableware under the condition of reduced spray water flow.

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