Drainage structure for cleaning machine and control method thereof

Abstract

A drainage structure for a cleaning machine and a control method thereof, wherein a drive motor and a drainage pump motor are installed in a drainage pump housing of the drainage structure, a drive output end of the drive motor is connected to and fixed to the drainage pump motor, a drainage pump impeller is provided inside the housing, the drainage pump impeller is mounted on the output shaft of the drainage pump motor, a pump chamber water outlet is provided on the side wall of the housing, the drainage pump impeller is adjacent to the pump chamber water outlet, and the drainage pump motor and the drainage pump impeller can move as a whole along the axial direction of the drainage pump impeller under the drive of a driving member, thereby adjusting the axial relative position of the drainage pump impeller and the pump chamber water outlet. The drainage structure for a cleaning machine can perform adaptive axial movement in the pump chamber according to the working conditions, can better adapt to the conditions of increased food residue and low drainage efficiency, and realize adaptive improvement of drainage and slag removal capacity. Different power feedback signals are obtained according to different motor loads, and different working conditions of the drainage pump impeller are identified, so that the system can make targeted adaptive actions.

Description

Technical Field

[0001] The present invention relates to cleaning equipment, in particular to a drainage structure for a cleaning machine and a control method thereof. Background Art

[0002] A dishwasher is a device that sprays cold or hot water onto dishes to remove dirt and wash the dishes or fruits and vegetables. Dishwashers are one of the most common types of dishwashers. Their popularity has greatly improved the convenience of dishwashing. Their "large capacity" meets the basic dishwashing needs of households, but this also increases the amount of food residue left on the dishes. Currently, some technologies collect all food residue, requiring cleaning each time, which is cumbersome and can lead to bacterial growth, affecting the user experience. However, draining the residue with water runs the risk of clogging the drainage system. When a dishwasher washes dishes, a large amount of food residue will fall off the surface of the dishes. After these residues enter the pump cavity of the drain pump, they will increase a certain load and pressure on the rotation of the drain pump impeller. In order to enhance the slag discharge capacity, some drain pumps have made an "avoidance" treatment on the drain pump impeller (a larger space is left at the water suction position in front of the impeller to accommodate some food residue so that it does not directly enter the gap between the impeller blades and the pump cavity, increasing the risk of blockage). This causes the axis of the impeller in the water to deviate from the center of the drain outlet, and air entrapment occurs in the drain pump, increasing the risk of exhaust and drainage difficulties. Making space avoidance at the front end of the impeller (and aligning the slag storage position with the drain outlet) is conducive to improving the slag discharge capacity, but the exhaust and drainage capacity decreases, and it is difficult to cope with the extreme state of the drain pipe hanging at a large height; aligning the center of the impeller with the center of the drain outlet (that is, no avoidance at the front end) can improve the exhaust and drainage capacity, but faces the risk of slag discharge difficulties. Therefore, the axial position of the drainage pump impeller is very critical. The current existing drainage system has poor adaptability, making it difficult to balance the drainage capacity and slag discharge capacity, and has a high failure rate. The position of the drainage pump impeller is single and cannot be adaptively adjusted according to the actual drainage conditions. Summary of the Invention

[0003] The first technical problem to be solved by the present invention is to provide a drainage structure for a cleaning machine in which the axial position of the impeller of a drainage pump can be adjusted in response to the current status of the above-mentioned prior art.

[0004] The second technical problem to be solved by the present invention is to provide a control method for the drainage structure of a cleaning machine that can intelligently adjust the axial position of the drainage pump impeller under different working conditions to achieve adaptive improvement of the drainage and slag removal capabilities.

[0005] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: the drainage structure for a cleaning machine includes a shell, the shell has a water inlet and a pump chamber water outlet, the water inlet is used to communicate with the drain outlet of the cleaning machine, a drainage and slag discharge channel connecting the water inlet and the pump chamber water outlet is formed inside the shell, and a drainage pump shell is installed on the shell, which is characterized in that: a driving member and a drainage pump motor are installed in the drainage pump shell, the driving output end of the driving member is connected to and fixed on the drainage pump motor, a drainage pump impeller is provided in the area inside the shell and adjacent to the pump chamber water outlet, the drainage pump impeller is installed on the output shaft of the drainage pump motor, and the pump chamber water outlet is provided on the side wall of the shell, and the drainage pump motor and the drainage pump impeller can move as a whole along the axial direction of the drainage pump impeller under the drive of the driving member, thereby adjusting the relative position of the drainage pump impeller and the pump chamber water outlet in the axial direction of the drainage pump impeller.

[0006] Preferably, the drain pump impeller has at least a first axial limit position and a second axial limit position. When the drain pump impeller is in the first axial limit position, the drain pump impeller and the pump chamber outlet are offset by a maximum position in the axial direction of the drain pump impeller, thereby leaving a maximum space for accommodating food residue between the front end of the drain pump impeller and the pump chamber outlet. When the drain pump impeller is in the second axial limit position, the drain pump impeller and the pump chamber outlet are completely aligned in the axial direction of the drain pump impeller. In this way, when the drain pump impeller is in the first axial limit position, a large space is left at the front end of the pump chamber, which can accommodate a maximum amount of food residue, sewage, and other waste. With the centrifugal action of the impeller, pollutants are gradually discharged from the chamber. In this case, the system has a strong capacity for accommodating food residue, and is suitable for "heavy-load" washing modes with a large amount of tableware and food residue and heavy oil pollution, such as ultra-clean washing. When the drainage pump impeller is in the second axial extreme position, the drainage efficiency is the highest. There is no risk of air entrapment under the condition of extreme hanging height capacity, but at the same time the slag discharge capacity is correspondingly weakened. This mode is suitable for "light load" washing mode, such as ultra-fast washing.

[0007] Further preferably, the drain pump impeller further has an axially intermediate position between the first axial extreme position and the second axial extreme position. When the drain pump impeller is in the axially intermediate position, the drain pump impeller and the pump chamber water outlet are axially offset, leaving space for accommodating food residues between the front end of the drain pump impeller and the pump chamber water outlet. When the drain pump impeller is in the axially intermediate position, the exhaust capacity and the residue discharge capacity are relatively balanced, the drain pump impeller is basically aligned with the water outlet, and air entrapment is less likely to occur. At the same time, a certain amount of space is left at the front end of the drain pump to accommodate food residues. Therefore, this mode is more suitable for conventional situations, such as daily washing, energy-saving washing, and other washing sequences.

[0008] In order to make the water drainage and slag discharge smoother, the water outlet direction of the pump chamber water outlet is perpendicular to the axial direction of the drainage pump impeller.

[0009] Preferably, a water hole and a pump chamber water inlet are provided in the drainage and slag discharge channel. The water hole is located upstream of the pump chamber water inlet in the direction of fluid flow. A valve mounting port is provided on the housing for mounting a control valve for controlling the opening and closing of the water hole. In this way, the water hole can be opened or closed as needed.

[0010] Further preferably, the pump chamber water suction port is arranged in the axial extension direction of the drainage pump impeller, and the water outlet direction of the water hole and the water inlet direction of the pump chamber water suction port are perpendicular to each other.

[0011] The driving member can have various structures. Preferably, the driving member is a driving motor, and the tail end of the driving motor is fixed to the drain pump housing through a motor fixing nut. In this way, the motor fixing nut can limit the axial position of the driving motor on the drain pump housing.

[0012] More preferably, the driving motor is a DC motor. The DC motor has a consistent rotation direction, which can stabilize the drainage and slag removal capabilities and enhance the ability to resist the hanging height of the external drainage pipe.

[0013] The driving motor can have a variety of structures to drive the drainage pump motor and the drainage pump impeller to move axially. Preferably, an axial mounting hole is opened inside the drainage pump casing, and the driving motor and the drainage pump motor are installed in the axial mounting hole. The driving motor has a push rod, and the drainage pump motor has an axial socket for inserting the push rod.

[0014] In order to make the axial movement of the drainage pump motor and the drainage pump impeller more stable, there are at least two push rods, which are evenly distributed along the circumference.

[0015] In order to achieve radial sealing of the drain pump motor, a sealing sleeve is sleeved on the outer peripheral wall of the drain pump motor to seal with the axial mounting hole, thereby preventing water from leaking into the active space of the drive motor push rod.

[0016] The technical solution adopted by the present invention to solve the second technical problem is: the control method for the drainage structure of the cleaning machine is characterized by comprising the following steps:

[0017] Step 1:

[0018] The control valve is opened and the drainage pump starts running. At this time, the initial position of the drainage pump impeller is not fixed, and the position at the last end is memorized;

[0019] Detect the drain pump output power and read the power value P. Compare it with the preset value Pn. Pn is the actual output power under full-load drainage. If the drain pump power P < (Pn-5w) when detected for the first time and the state lasts for t1 (t1≥10s), proceed to step 2. If it recovers to "(Pn-5w)≤P≤(Pn+5w)" within the 10s detection time and maintains this state for a certain period of time t2 (t2≥5s), it is determined that the system has escaped the risk of air entrapment and proceed to step 3. Otherwise, proceed to step 2 as well.

[0020] If the drainage pump power P reaches "(Pn-5w)≤P≤(Pn+5w)" during the first detection and this state lasts for a period of time t3 (t3≥10s), the drainage is considered normal and step 3 is executed. If it exceeds this range within 10s, the timing test is restarted.

[0021] If the drain pump power P reaches "P>(Pn+5w)" during the first detection and lasts for a period of time t4 (t4≥5s), go to step 5. If it exceeds this range within 5s, restart the timing test.

[0022] Step 2:

[0023] It is determined that there is air in the pump cavity, and the drainage pump impeller "axial position correction" sequence 1 intervenes: the drainage pump impeller moves axially and reaches the equilibrium position. At this time, the power test is performed again. If "P<(Pn-5w) and the state lasts for t1 (t1≥10s)", step 4 is executed. If it recovers to "(Pn-5w)≤P≤(Pn+5w)" within the 10s test time and maintains this state for a certain period of time (t2≥5s), it is determined that the system has escaped the risk of air entrapment, and step 3 is executed. If it cannot be maintained for 5s (t2<5s), the timing test is restarted.

[0024] Step 3:

[0025] Execute normal drainage logic until drainage is completed;

[0026] Step 4:

[0027] The impeller of the drainage pump reciprocates twice within the stroke range completed in step 2 to break the "cyclonic balance" state caused by the trapped air phenomenon, break up and discharge the bubbles in time;

[0028] The first activation is accompanied by the operation of the drainage pump until it ends; the second activation is accompanied by the operation of the drainage pump and step 1 is executed synchronously until the drainage is normal and step 3 is executed. If P < (Pn-5w) appears again after returning to step 1 and the state lasts for t1 (t1 ≥ 10s), step 6 is executed;

[0029] Step 5:

[0030] If the drainage is poor due to food residue stuck or other issues, the drainage pump axial position correction sequence is activated: the drainage pump motor and impeller are retracted to the left limit position to allow more space for drainage, and the process returns to step 1 until drainage is normal and then to step 3.

[0031] Step 6:

[0032] Execute the "full stroke axial movement" procedure for the drainage pump impeller, and run it back and forth between the left and right extreme positions twice. The first movement is accompanied by the operation of the drainage pump, and step 1 is executed synchronously until the drainage is normal and step 3 is executed.

[0033] Further preferably, the reciprocating speed of the drainage pump impeller in step 4 and step 6 is 1 mm / s.

[0034] Compared with the prior art, the advantages of the present invention are: the drainage structure for the cleaning machine adopts a direct discharge method, the slag discharge capacity is enhanced, there is no need to manually clean the slag basket every time, saving time and effort, and avoiding the risk of odor and bacteria caused by food residues; an axial expansion drainage pump chamber is designed, and the rear end water outlet is designed to increase the front end slag storage volume, enhance the slag discharge capacity, and reduce the risk of clogging. The drainage pump assembly can perform adaptive axial movement in the pump chamber according to the working conditions, and can better adapt to the conditions of increased food residue and low drainage efficiency, and realize adaptive improvement of drainage and slag discharge capacity. The drainage pump motor power can be read, and different power feedback signals are obtained according to different motor loads. The different working conditions of the drainage pump impeller are identified, and the system makes targeted adaptive actions. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic structural diagram of a drainage structure according to an embodiment of the present invention;

[0036] Figure 2 for Figure 1 An exploded schematic diagram of the drainage structure shown;

[0037] Figure 3 for Figure 1 The schematic diagram of the structure of the drainage structure shown is shown with the shell removed;

[0038] Figure 4 for Figure 3 The structure shown is a schematic diagram of the structure after the drainage pump housing is removed;

[0039] Figure 5 This is a structural cross-sectional view of the embodiment when the impeller of the drainage pump is in the first axial limit position;

[0040] Figure 6 This is a structural cross-sectional view of the embodiment when the impeller of the drainage pump is in the second axial limit position;

[0041] Figure 7 This is a structural cross-sectional view of the embodiment when the drainage pump impeller is in the axial middle position. DETAILED DESCRIPTION

[0042] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0043] like Figures 1 to 4 As shown, the drainage structure for a cleaning machine of this embodiment includes a housing 1 and a drainage pump housing 2 mounted on the housing 1. The housing 1 has a water inlet 11 and a pump chamber water outlet 12. The water inlet 11 is used to communicate with the drainage outlet of the cleaning machine. The pump chamber water outlet 12 is provided on the side wall of the housing 1. A drainage and slag discharge channel connecting the water inlet 11 and the pump chamber water outlet 12 is formed inside the housing 1. A water hole 13 and a pump chamber water intake 14 are provided in the drainage and slag discharge channel. Along the direction of fluid flow, the water hole 13 is provided upstream of the pump chamber water intake 14. A valve mounting port 15 is provided on the housing 1. The valve mounting port 15 is used to install a control valve (not shown in the figure). The control valve is used to open or close the water hole 13. When the water hole 13 is open, the drainage and slag discharge channel is open. When the water hole 13 is closed, the drainage and slag discharge channel is closed.

[0044] The drain pump housing 2 is mounted on the casing 1, and an axial mounting hole 21 is provided inside the drain pump housing 2. The drive motor 5 and the drain pump motor 3 are mounted in the axial mounting hole 21. The tail end of the drive motor 5 is fixed to the drain pump housing 2 by a motor fixing nut 6 to achieve axial limitation. The drive motor 5 of this embodiment is a DC motor. The rotation direction of the DC motor is consistent, which can stabilize the drainage and slag discharge capabilities and enhance the ability to resist the hanging height of the external drain pipe. The drive motor 5 has three circumferentially evenly distributed push rods 51, and the front end of the push rod 51 is inserted into the axial socket of the drain pump motor 3 and fixed by screws. A sealing sleeve 7 is provided on the outer peripheral wall of the drain pump motor 3 to seal with the axial mounting hole 21 to achieve radial sealing of the drain pump motor 3.

[0045] The drain pump impeller 4 is mounted on the output shaft of the drain pump motor 3 and secured with an impeller retaining nut 8. The drain pump impeller 4 is located within the housing 1, adjacent to the pump chamber water outlet 12. The water outlet direction of the pump chamber water outlet 12 is perpendicular to the axial direction of the drain pump impeller 4. Furthermore, the pump chamber water intake 14 is located in the axial direction of the drain pump impeller 4, with the water outlet direction of the water hole 13 and the water inlet direction of the pump chamber water intake 14 being perpendicular to each other.

[0046] Driven by the drive motor 5, the drainage pump motor 3 and the drainage pump impeller 4 can move as a whole along the axial direction of the drainage pump impeller 4, thereby adjusting the relative position of the drainage pump impeller 4 and the pump chamber water outlet 12 in the axial direction of the drainage pump impeller 14. The drainage pump impeller 4 can reciprocate between the first axial extreme position, the second axial extreme position and the axial middle position. The total axial movement of the drainage pump impeller is 2A mm (the total stroke is 2A), and it can move A mm in the forward and reverse directions respectively at the middle equilibrium position. For example, the total stroke of the drainage pump involved in this embodiment is about 12 mm, and it can be adjusted in the forward and reverse directions by a maximum of 6 mm at the middle equilibrium position (it can hover at any axial position), and it can be adaptively adjusted according to the power feedback.

[0047] like Figure 5 As shown, the impeller 4 is in its first axial limit position. At this point, the impeller 4 and the pump chamber outlet 12 are offset to their maximum axial position, leaving a maximum space between the front end of the impeller 4 and the pump chamber outlet 12 for accommodating food residue. This allows for the maximum amount of food residue, sewage, and other waste. With the centrifugal action of the impeller, pollutants are gradually expelled from the chamber. Under this operating condition, the system has a high capacity for accommodating food residue and a strong ability to resist the risk of residue jamming. Under the action of the residue, the mixture system inside the pump chamber is relatively complex, and the bubbles formed are also dispersed by the dual effects of food residue extrusion and shearing from the impeller. They are less likely to accumulate in the center or around the impeller, thus minimizing the risk of air entrapment and improving exhaust capacity. However, under clear water conditions (e.g., a small amount of tableware or a low level of contamination), if the drain pipe is hung at a high height (e.g., over 800 mm), exhaust capacity will be significantly impacted. At this point, bubbles tend to accumulate around the impeller, forming a "trapped air" phenomenon, reducing both exhaust and drainage capacity. Therefore, this mode is more suitable for "heavy-load" washing modes with more tableware and food residue and more serious oil pollution, such as ultra-clean washing.

[0048] like Figure 6 As shown, the drain pump impeller 4 is in an axially intermediate position between the first and second axial extreme positions. In this operating condition, the air exhaust and debris removal capabilities are relatively balanced, and the drain pump impeller 4 is substantially aligned with the pump chamber water outlet 12, making air entrapment less likely. There is also sufficient space at the front end of the drain pump to accommodate food residue. Therefore, this mode is more suitable for conventional washing sequences, such as daily washing and energy-saving washing.

[0049] like Figure 7As shown, the drainage pump impeller 4 is in the second axial extreme position. At this time, the drainage pump impeller 4 and the pump chamber water outlet 12 are completely aligned in the axial direction of the drainage pump impeller. Under this working condition, the drainage efficiency is the highest, and there is no risk of air entrapment under the condition of extreme hanging height capacity, but at the same time the slag discharge capacity is correspondingly weakened. This mode is suitable for "light load" washing mode, such as ultra-fast washing. At the same time, this mode is also very suitable for the last 1 to 2 washing processes of all washing sequences (the corresponding water quality has reached a relatively good level, and the food residues are basically completely carried away by the wastewater and discharged out of the cavity).

[0050] During the operation of the drainage pump motor 3, its real-time operating power keeps changing (it changes with the impeller load, with higher power when the load is greater and lower power when the load is less). Therefore, the working condition of the drainage pump in the pump chamber can be identified based on the power change. The judgment logic and control method are as follows:

[0051] Step 1:

[0052] The control valve is opened and the drainage pump starts running. At this time, the initial position of the drainage pump impeller is not fixed, and the position at the last end is memorized;

[0053] Detect the drain pump output power and read the power value P. Compare it with the preset value Pn. Pn is the actual output power under full-load drainage. If the drain pump power P < (Pn-5w) when detected for the first time and the state lasts for t1 (t1≥10s), proceed to step 2. If it recovers to "(Pn-5w)≤P≤(Pn+5w)" within the 10s detection time and maintains this state for a certain period of time t2 (t2≥5s), it is determined that the system has escaped the risk of air entrapment and proceed to step 3. Otherwise, proceed to step 2 as well.

[0054] If the drainage pump power P reaches "(Pn-5w)≤P≤(Pn+5w)" during the first detection and this state lasts for a period of time t3 (t3≥10s), the drainage is considered normal and step 3 is executed. If it exceeds this range within 10s, the timing test is restarted.

[0055] If the drain pump power P reaches "P>(Pn+5w)" during the first detection and lasts for a period of time t4 (t4≥5s), go to step 5. If it exceeds this range within 5s, restart the timing test.

[0056] Step 2:

[0057] It is determined that there is air in the pump cavity, and the drainage pump impeller "axial position correction" sequence 1 intervenes: the drainage pump impeller moves axially and reaches the equilibrium position. At this time, the power test is performed again. If "P<(Pn-5w) and the state lasts for t1 (t1≥10s)", step 4 is executed. If it recovers to "(Pn-5w)≤P≤(Pn+5w)" within the 10s test time and maintains this state for a certain period of time (t2≥5s), it is determined that the system has escaped the risk of air entrapment, and step 3 is executed. If it cannot be maintained for 5s (t2<5s), the timing test is restarted.

[0058] Step 3:

[0059] Execute normal drainage logic until drainage is completed;

[0060] Step 4:

[0061] The impeller of the drainage pump reciprocates twice within the stroke range completed in step 2, with a speed of 1 mm / s, to break the "cyclonic balance" state caused by the trapped air phenomenon, break up and discharge the bubbles in time;

[0062] The first activation is accompanied by the operation of the drainage pump until it ends; the second activation is accompanied by the operation of the drainage pump and step 1 is executed synchronously until the drainage is normal and step 3 is executed. If P < (Pn-5w) appears again after returning to step 1 and the state lasts for t1 (t1 ≥ 10s), step 6 is executed;

[0063] Step 5:

[0064] If the drainage is poor due to food residue stuck or other issues, the drainage pump axial position correction sequence is activated: the drainage pump motor and impeller are retracted to the left limit position to allow more space for drainage, and the process returns to step 1 until drainage is normal and then to step 3.

[0065] Step 6:

[0066] Execute the "full stroke axial movement" procedure of the drainage pump impeller, and run back and forth between the left and right extreme positions twice. The running speed can be 1mm / s. The first movement is accompanied by the operation of the drainage pump, and step 1 is executed synchronously until the drainage is normal and step 3 is executed.

Claims

1. A drainage structure for a cleaning machine, comprising a housing (1), wherein the housing (1) has a water inlet (11) and a pump chamber water outlet (12), wherein the water inlet (11) is used to communicate with a drainage outlet of the cleaning machine, and a drainage and slag discharge channel communicating with the water inlet (11) and the pump chamber water outlet (12) is formed inside the housing (1), and a drainage pump housing (2) is installed on the housing (1), characterized in that: A driving member and a drainage pump motor (3) are installed in the drainage pump housing (2), and the driving output end of the driving member is connected to and fixed on the drainage pump motor (3). A drainage pump impeller (4) is provided in the housing (1) and in an area adjacent to the pump chamber water outlet (12). The drainage pump impeller (4) is installed on the output shaft of the drainage pump motor (3), and the pump chamber water outlet (12) is provided on the side wall of the housing (1). The drainage pump motor (3) and the drainage pump impeller (4) can move as a whole along the axial direction of the drainage pump impeller (4) under the drive of the driving member, thereby adjusting the axial position of the drainage pump impeller (4) and the pump chamber water outlet (12) in the drainage pump impeller (4). The relative position in the direction; the water outlet direction of the pump chamber water outlet (12) is perpendicular to the axial direction of the drainage pump impeller (4); a water hole (13) and a pump chamber water suction port (14) are provided in the drainage and slag discharge channel, and along the fluid flow direction, the water hole (13) is provided upstream of the pump chamber water suction port (14); a valve mounting port (15) is provided on the housing (1), and the valve mounting port (15) is used to install a control valve that controls the opening and closing of the water hole (13); the pump chamber water suction port (14) is provided in the axial extension direction of the drainage pump impeller (4), and the water outlet direction of the water hole (13) and the water inlet direction of the pump chamber water suction port (14) are perpendicular to each other.

2. The drainage structure for a cleaning machine according to claim 1, characterized in that: The drainage pump impeller (4) has at least a first axial limit position and a second axial limit position. When the drainage pump impeller (4) is in the first axial limit position, the drainage pump impeller (4) and the pump chamber water outlet (12) are offset to a maximum position in the axial direction of the drainage pump impeller, so that a maximum space for accommodating food residues is left between the front end of the drainage pump impeller (4) and the pump chamber water outlet (12). When the drainage pump impeller (4) is in the second axial limit position, the drainage pump impeller (4) and the pump chamber water outlet (12) are completely aligned in the axial direction of the drainage pump impeller.

3. The drainage structure for a cleaning machine according to claim 2, characterized in that: The drainage pump impeller (4) further has an axial intermediate position between a first axial limit position and a second axial limit position. When the drainage pump impeller (4) is in the axial intermediate position, the drainage pump impeller (4) and the pump chamber water outlet (12) are axially staggered, so that a space for accommodating food residues is left between the front end of the drainage pump impeller (4) and the pump chamber water outlet (12).

4. The drainage structure for a cleaning machine according to claim 1, characterized in that: The driving component is a driving motor (5), and the tail end of the driving motor (5) is fixed to the drainage pump housing (2) via a motor fixing nut (6).

5. The drainage structure for a cleaning machine according to claim 4, characterized in that: The driving motor (5) is a DC motor.

6. The drainage structure for a cleaning machine according to claim 4, characterized in that: An axial mounting hole (21) is provided inside the drainage pump housing (2), and the drive motor (5) and the drainage pump motor (3) are mounted in the axial mounting hole (21). The drive motor (5) has a push rod (51), and the drainage pump motor (3) has an axial insertion hole for inserting the push rod (51).

7. The drainage structure for a cleaning machine according to claim 6, characterized in that: There are at least two push rods (51), which are evenly distributed along the circumference.

8. The drainage structure for a cleaning machine according to claim 6, characterized in that: A sealing sleeve (7) is sleeved on the outer peripheral wall of the drainage pump motor (3) and is used to seal with the axial mounting hole (21).

9. A control method for a drainage structure of a cleaning machine, characterized in that Using the drainage structure according to any one of claims 1 to 8, the control method comprises the following steps: Step 1: The control valve is opened and the drainage pump starts running. At this time, the initial position of the drainage pump impeller is not fixed, and the position at the last end is memorized; Detect the drain pump output power and read the power value P, and compare it with the preset value Pn. Pn is the actual output power under full-load drainage state. If the drain pump power P is less than (Pn - 5w) for the first time and the state lasts for t1, go to step 2. If the state recovers to "(Pn - 5w) ≤ P ≤ (Pn + 5w)" within the 10s detection time and remains in this state for a certain period of time t2, the system is determined to have escaped the risk of air trapping and step 3 is executed. Otherwise, step 2 is also executed. If the drain pump power P reaches "(Pn - 5w)≤P≤(Pn + 5w)" during the first test and this state lasts for time t3, the drainage is considered normal and step 3 is executed. If it exceeds this range within 10s, the timing test is restarted. If the drain pump power P reaches "P>(Pn + 5w)" during the first test and lasts for t4, go to step 5. If it exceeds this range within 5s, restart the test. Step 2: If air is detected in the pump chamber, the drainage pump impeller "axial position correction" sequence 1 is activated: the drainage pump impeller moves axially and reaches the equilibrium position. A power test is then performed again. If "P < (Pn - 5w) and remains in this state for t1," proceed to step 4. If the state recovers to "(Pn - 5w) ≤ P ≤ (Pn + 5w)" within the 10s test time and is maintained for a certain period of time, the system is deemed to have escaped the risk of air entrapment and proceed to step 3. If the state cannot be maintained for 5s, the test is repeated. Step 3: Execute normal drainage logic until drainage is completed; Step 4: The impeller of the drainage pump reciprocates twice within the stroke range completed in step 2 to break the "cyclonic balance" state caused by the trapped air phenomenon, break up and discharge the bubbles in time; The first pumping is accompanied by the drain pump running until it ends; the second pumping is accompanied by the drain pump running and step 1 is executed synchronously until the drainage is normal and step 3 is executed. If P < (Pn - 5w) appears again after returning to step 1 and the state lasts for t1, step 6 is executed; Step 5: If the drainage is poor due to food residue stuck, the drainage pump axial position correction sequence is intervened: the drainage pump motor and drainage pump impeller are retracted to the left limit position as a whole to leave more space for residue discharge, and then return to step 1 until the drainage is normal and proceed to step 3; Step 6: Execute the "full-stroke axial movement" procedure for the drainage pump impeller, and run it back and forth between the left and right extreme positions twice. The first movement is accompanied by the operation of the drainage pump, and step 1 is performed synchronously until drainage is normal and step 3 is performed.

10. The control method for the drainage structure of a cleaning machine according to claim 9, characterized in that: The reciprocating speed of the drainage pump impeller in step 4 and step 6 is 1 mm / s.

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