A cleaning machine and a method for adaptively adjusting its stable performance

Abstract

The present invention relates to a cleaning machine and a self-adaptive adjustment method for its stable performance. The cleaning machine includes a housing, a pump housing, a spray arm, an impeller assembly and a motor. The motor includes a housing, a motor shaft, a rotor, a stator, a magnetic part and an electromagnet. The lower end of the motor shaft extends out from under the housing. The magnetic part is installed at the lower end of the motor shaft. The electromagnet is arranged at the bottom of the housing and corresponds to the magnetic part at the lower end of the motor shaft. The electromagnet is attracted to the magnetic part when powered on. The present invention detects the operating power of the motor itself to judge the amount of foam generated in the washing water. When the amount of foam generated is in a high-foam environment, the electromagnet is powered on, and the magnetic part is attracted to the motor shaft and the impeller assembly downward to form a limit to prevent the motor shaft and the impeller assembly from moving up and down, thereby improving the stability of the water flow inside the pump housing, reducing the amount of foam generated, and improving the cleaning effect. The rotor and the stator are just in correspondence with each other to form an effective magnetic field, maintaining the high-efficiency operation of the motor, and further improving the cleaning effect.

Description

Technical Field

[0001] The invention relates to the technical field of dishwashers, and in particular to a washing machine and a method for adaptively adjusting the stability performance thereof. Background Art

[0002] At present, large-capacity dishwashers are widely used in home kitchens.

[0003] The applicant's prior patent ZL202023348766.9 "A dual pump system and a cleaning machine using the dual pump system" discloses a structure, wherein the dual pump system includes an upper impeller, a lower impeller, an upper shell, a lower shell and a driving member, the upper shell having a first accommodating chamber for installing the upper part of the first blade, the upper part of the lower shell having a second accommodating chamber for installing the lower part of the first blade, a first water inlet for supplying water into the second accommodating chamber is opened on the side wall of the lower shell, a third accommodating chamber for installing the lower impeller is opened on the lower part of the lower shell, and a second water inlet and a water outlet are opened on the side wall and / or the bottom wall of the lower shell; the cleaning machine includes a box body and a water supply pipe that can transport water at the bottom of the box body upward, the lower shell body is constrained on the bottom wall of the box body and the water outlet is connected to the lower end of the water supply pipe; the driving member is a motor, which is arranged at the outer bottom of the box body and the motor shaft passes through the bottom wall of the box body and is connected to the lower impeller and the upper impeller to drive the upper impeller and the lower impeller to rotate to achieve water pumping.

[0004] In the above scheme, there are clear requirements for the motor structure and its connection with the upper and lower impellers, and the corresponding motor power. Generally, when using a DC motor, the motor efficiency is 70%-80%. A motor efficiency below 70% will increase the energy consumption of the whole machine and reduce the cleaning efficiency. For a washing environment with no or little foam, the motor power is usually relatively stable and can meet the cleaning needs. However, during the cleaning process, under the action of different pollutants, dishwashing powder or rinse agent, the water in the cavity is prone to produce a large amount of foam, the water volume is reduced, and the water flow entering the flow channel entrains foam, causing a huge change in the flow state of the water flow, and the load stability is extremely poor, resulting in an unstable water flow state for the impeller. Because the motor needs to be designed to avoid the rotor from getting stuck during operation, rotor gaps are designed on the upper and lower sides of the rotor. When the water flow state is unstable, the rotor and the motor shaft will shake up and down. At this time: the rotor and the stator will shift up and down, and the magnetic field will also change, generating an invalid magnetic field, affecting the motor efficiency; the rotor and the motor shaft will also drive the impeller to shake up and down, causing water flow power fluctuations. This fluctuation will intensify the generation of foam and further worsen the internal water flow state; the upper and lower gaps of the impeller in the pump casing are inconsistent and change frequently, which greatly affects the flow state of water in the pump casing, causing water vortices, turbulence, and even backflow collisions inside the pump casing, which directly leads to a decrease in water power and a serious cleaning effect. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a cleaning machine that can always keep the rotor and stator corresponding to each other to avoid the up and down shaking of the rotor, motor shaft and impeller, thereby improving the stability of water flow inside the pump casing, reducing the amount of foam generated and improving the cleaning effect.

[0006] The second technical problem to be solved by the present invention is to provide a method for adaptively adjusting the stability performance of the above-mentioned cleaning machine in view of the current status of the prior art.

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

[0008] A cleaning machine comprises a box body, a pump casing, a spray arm, an impeller assembly and a motor, wherein the pump casing is arranged in the box body and supported at the bottom of the box body, a water outlet is opened at the top of the pump casing, the spray arm is rotatably arranged at the top of the pump casing, a water inlet corresponding to the water outlet is opened at the bottom wall, and a water spray hole is opened at the top wall, the impeller assembly is rotatably arranged in the pump casing, and is used to draw water from the bottom of the box body upward, the motor is arranged at the outer bottom of the box body, and the motor shaft passes through the bottom wall of the box body and is connected to the impeller assembly, the motor comprises a casing, a motor shaft, a rotor The invention relates to a motor, a stator, a magnetic part and an electromagnet. The motor shaft is rotatably supported in the casing through an upper bearing and a lower bearing, and the upper end of the motor shaft extends out of the casing. The rotor is located in the casing, sleeved on the outer periphery of the motor shaft and moves synchronously with the motor shaft. The stator is arranged in the casing and fixed on the outer periphery of the rotor. The lower end of the motor shaft extends out from under the casing. The magnetic part is installed at the lower end of the motor shaft. The electromagnet is arranged at the bottom of the casing and corresponds to the magnetic part arrangement at the lower end of the motor shaft. The electromagnet is attracted to the magnetic part when the power is on.

[0009] Preferably, the electromagnet is formed into a bowl shape with an opening facing upwards to surround the lower end of the motor shaft. When the electromagnet is energized and attracted to the magnetic part, the magnetic part abuts against the inner bottom wall of the electromagnet, and the rotor just corresponds to the stator. With the above structure, the electromagnet, on the one hand, limits the bottom of the motor shaft to prevent it from moving downward, and on the other hand, is used to attract and position the motor shaft.

[0010] As an improvement, the bottom of the housing is provided with a through hole through which the lower end of the power supply shaft extends downward and the accumulated water in the housing is discharged downward into the electromagnet cavity, and the bottom of the electromagnet cavity is provided with a drainage port arranged near the edge. The electromagnet cavity is provided with a drainage impeller installed on the motor shaft and rotating the motor shaft to provide drainage power. The above structure reduces the sealing requirements of the motor housing, and the strong suction and drainage of the motor shaft and the drainage impeller can be used to ensure that there is no accumulated water in the housing.

[0011] In the present invention, the housing has a first cavity surrounding the outer periphery of the motor shaft and a second cavity arranged outside the first cavity, the rotor is arranged in the first cavity, and the stator is arranged in the second cavity.

[0012] Preferably, the housing is provided with an upper bearing for supporting the upper part of the motor shaft at the top and a lower bearing for supporting the lower part of the motor shaft at the bottom. The outer periphery of the motor shaft is sleeved with a first gasket arranged close to the upper end of the rotor and a second gasket arranged close to the lower end of the rotor. There is a first gap between the first gasket and the upper bearing, and there is a second gap between the second gasket and the lower bearing. The first gap and the second gap are reserved for the motor shaft and the rotor to move up and down, so as to avoid damage to the internal parts of the motor due to strong collision.

[0013] Preferably, the motor further comprises a graphite component, which is arranged at the lower end of the rotor and between the rotor and the motor shaft, and close to the lower bearing. This structure is conducive to reducing friction and collision.

[0014] Preferably, the impeller assembly includes an upper impeller and a lower impeller, the spray arm has a first accommodating chamber for installing the upper part of the upper impeller, the upper part of the pump housing has a second accommodating chamber for installing the lower part of the upper impeller, the side wall of the pump housing is provided with a first water inlet for supplying water into the second accommodating chamber, the lower part of the pump housing has a third accommodating chamber for installing the lower impeller, the side wall and / or the bottom wall of the pump housing are provided with a second water inlet and a water outlet, the top edge of the lower impeller and the inner top wall of the third accommodating chamber have a first spacing, and the bottom edge of the lower impeller and the inner bottom wall of the third accommodating chamber have a second spacing. This structure is conducive to avoiding collision between the lower impeller and the pump housing.

[0015] A method for adaptively adjusting the stability performance of a cleaning machine comprises the following steps:

[0016] Water is fed into the box. After the water is fed in, the electromagnet is powered off, the motor runs, and the impeller assembly is driven to rotate, and the water at the bottom of the box is continuously drawn into the spray arm and sprayed upwards.

[0017] During the cleaning process, the motor detects its own power status in real time. When the motor speed reaches the set maximum speed, the motor power decreases by more than 10W, and this status is maintained for no less than 10s, it is determined that a large amount of foam is generated inside the box, the water flow inside the pump casing has entrained an uncontrollable amount of foam, and the impeller assembly and the motor rotor move up and down; at this time, the electromagnet is energized to attract the magnetic part at the bottom of the motor shaft, and the motor shaft and the impeller assembly thereon are positioned, so that the magnetic field between the motor rotor and the stator always remains stable in the effective area, and the impeller assembly runs smoothly, thereby stabilizing the water flow state in the pump casing.

[0018] Compared with the prior art, the advantages of the present invention are: the present invention detects the operating power of the motor itself, thereby judging the amount of foam generated in the washing water; when the amount of foam generated is in a high-foam environment, the electromagnet is energized to adsorb the magnetic parts, thereby sucking the motor shaft and the impeller assembly downward to form a limit, which, on the one hand, prevents the motor shaft and the impeller assembly from moving up and down, improves the stability of the water flow inside the pump casing, reduces the amount of foam generated, and improves the cleaning effect; on the other hand, makes the rotor correspond to the stator to form an effective magnetic field, maintains the high-efficiency operation of the motor, and further improves the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a partial structural schematic diagram of an embodiment of the present invention;

[0020] Figure 2 for Figure 1 Enlarged view of part A. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below with reference to the accompanying drawings.

[0022] like Figure 1 , 2 As shown, the cleaning machine of this embodiment includes a casing 1, a pump casing 2, a spray arm 3, an impeller assembly 4 and a motor 5. The pump casing 2 is arranged in the casing 1 and supported at the bottom of the casing 1. A water outlet 21 is provided at the top of the pump casing 2. The spray arm 3 is rotatably arranged at the top of the pump casing 2 and a water inlet 31 corresponding to the arrangement of the water outlet 21 is provided on the bottom wall, and a water spray hole 32 is provided on the top wall. The impeller assembly 4 is rotatably arranged in the pump casing 2 and is used to draw water from the bottom of the casing 1 upwards. The motor 5 is arranged at the outer bottom of the casing 1 and the motor shaft 51 passes through the bottom wall of the casing 1 and is connected to the impeller assembly 4.

[0023] The motor 5 includes a housing 52, a motor shaft 51, a rotor 53, a stator 54, a magnetic member 55, an electromagnet 56, and a graphite member 57. The motor shaft 51 is rotatably supported in the housing 52 through an upper bearing 511 and a lower bearing 512, and the upper end of the motor shaft 51 extends above the housing 52. The rotor 53 is located in the housing 52, sleeved on the outer periphery of the motor shaft 51, and moves synchronously with the motor shaft 51. The stator 54 is arranged in the housing 52 and fixed on the outer periphery of the rotor 53. The graphite member 57 is arranged at the lower end of the rotor 53 and is located between the rotor 53 and the motor shaft 51, and is arranged close to the lower bearing 512. The lower end of the motor shaft 51 extends below the housing 52. The magnetic member 55 is installed at the lower end of the motor shaft 51. The electromagnet 56 is arranged at the bottom of the housing 52 and is arranged corresponding to the magnetic member 55 at the lower end of the motor shaft 51. The electromagnet 56 is attracted to the magnetic member 55 when the power is on.

[0024] The electromagnet 56 is formed into a bowl shape with an opening facing upwards to surround the lower end of the motor shaft 51. When the electromagnet 56 is energized and attracted to the magnetic member 55, the magnetic member 55 abuts against the inner bottom wall of the electromagnet 56, and the rotor 53 just corresponds to the stator 54. With the above structure, the electromagnet 56, on the one hand, limits the bottom of the motor shaft 51 to prevent it from moving downward, and on the other hand, is used to attract and position the motor shaft 51.

[0025] The housing 52 has a first cavity 521 surrounding the outer periphery of the motor shaft 51 and a second cavity 522 arranged outside the first cavity 521. The rotor 53 is arranged in the first cavity 521, and the stator 54 is arranged in the second cavity 522. An upper bearing 511 for supporting the upper part of the motor shaft 51 is arranged at the top of the housing 52, and a lower bearing 512 for supporting the lower part of the motor shaft 51 is arranged at the bottom. A first gasket 513 arranged close to the upper end of the rotor 52 and a second gasket 514 arranged close to the lower end of the rotor 53 are sleeved on the outer periphery of the motor shaft 51. A first gap 501 is provided between the first gasket 513 and the upper bearing 511, and a second gap 502 is provided between the second gasket 514 and the lower bearing 512. The first gap 501 and the second gap 502 are reserved for the motor shaft 51 and the rotor 53 to move up and down, so as to avoid damage to the internal components of the motor due to strong collision.

[0026] In this embodiment, a through hole 510 is provided at the bottom of the housing 52, through which the lower end of the power supply shaft 51 extends downward and through which the accumulated water in the housing 52 is discharged downward into the cavity 560 of the electromagnet 56. A drainage port 561 arranged near the edge is provided at the bottom of the cavity 560 of the electromagnet 56. A drainage impeller 58 is provided in the cavity 560 of the electromagnet 56, which is mounted on the motor shaft 51 and rotates the motor shaft 51 to provide drainage power. The above structure reduces the sealing requirements of the motor housing 52, and the strong suction and drainage of the motor shaft 51 and the drainage impeller 58 can be used to ensure that there is no accumulated water in the housing 52.

[0027] The impeller assembly 4 of this embodiment includes an upper impeller 41 and a lower impeller 42, the spray arm 3 has a first accommodating chamber 10 for installing the upper part of the upper impeller 41, the upper part of the pump housing 2 has a second accommodating chamber 20 for installing the lower part of the upper impeller 41, the side wall of the pump housing 2 is provided with a first water inlet for supplying water into the second accommodating chamber 20, the lower part of the pump housing 2 has a third accommodating chamber 30 for installing the lower impeller 42, the bottom wall of the pump housing 2 is provided with a second water inlet, the side wall of the pump housing 2 is provided with a water outlet, the top edge of the lower impeller 42 and the inner top wall of the third accommodating chamber 30 have a first spacing 301, and the bottom edge of the lower impeller 42 and the inner bottom wall of the third accommodating chamber 30 have a second spacing 302. This structure is conducive to avoiding collision between the lower impeller and the pump housing 2.

[0028] The method for adaptively adjusting the stability performance of a cleaning machine in this embodiment includes the following steps:

[0029] Water is introduced into the box 1. After the water is introduced, the electromagnet 56 is powered off, and the motor 5 is operated to drive the impeller assembly 4 to rotate, and the water at the bottom of the box 1 is continuously drawn into the spray arm 3 and sprayed upward;

[0030] During the cleaning process, the motor 5 detects its own power status in real time. When the speed of the motor 5 reaches the set maximum speed, the motor power decreases by more than 10W, and this state is maintained for 10s, it is determined that a large amount of foam is generated inside the box body 1, and the water flow inside the pump casing 2 has entrained an uncontrollable amount of foam, and the impeller assembly 4 and the motor 5 rotor 53 move up and down; at this time, the electromagnet 56 is energized, and the magnetic part 55 at the bottom of the motor shaft 51 is attracted to position the motor shaft 51 and the impeller assembly 54 thereon, so that the magnetic field between the motor 5 rotor 53 and the stator 54 is always kept stable in the effective area, and the impeller assembly 4 runs smoothly, thereby stabilizing the water flow state in the pump casing 2.

[0031] In this embodiment, the operating power of the motor 5 is detected by itself, so as to determine the amount of foam generated in the washing water. When the amount of foam generated is in a high-foam environment, the electromagnet 56 is energized to attract the magnetic part 55, thereby sucking the motor shaft 51 and the impeller assembly 4 downward to form a limit. On the one hand, it prevents the motor shaft 51 and the impeller assembly 4 from moving up and down, thereby improving the stability of the water flow inside the pump housing 2, reducing the amount of foam generated, and improving the cleaning effect. On the other hand, it makes the rotor 53 correspond to the stator 54 to form an effective magnetic field, thereby maintaining the high-efficiency operation of the motor 5 and further improving the cleaning effect.

[0032] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A cleaning machine, comprising a housing (1), a pump housing (2), a spray arm (3), an impeller assembly (4) and a motor (5), wherein the pump housing (2) is arranged in the housing (1) and supported at the bottom of the housing (1), a water outlet (21) is provided at the top of the pump housing (2), the spray arm (3) is rotatably arranged at the top of the pump housing (2), a water inlet (31) arranged corresponding to the water outlet (21) is provided on the bottom wall, and a water spray hole (32) is provided on the top wall, the impeller assembly (4) is rotatably arranged in the pump housing (2) and used for drawing water at the bottom of the housing (1) upwards, the motor (5) is arranged at the outer bottom of the housing (1) and the motor shaft (51) passes through the bottom wall of the housing (1) and is connected to the impeller assembly (4), characterized in that: The motor (5) comprises a housing (52), a motor shaft (51), a rotor (53), a stator (54), a magnetic member (55) and an electromagnet (56); the motor shaft (51) is rotatably supported in the housing (52) and its upper end protrudes above the housing (52); the rotor (53) is located in the housing (52), sleeved on the outer periphery of the motor shaft (51) and moves synchronously with the motor shaft (51); the stator (54) is arranged in the housing (52) and fixed on the outer periphery of the rotor (53); the lower end of the motor shaft (51) protrudes below the housing (52); the magnetic member (55) is installed at the lower end of the motor shaft (51); the electromagnet (56) is arranged at the bottom of the housing (52) and corresponds to the magnetic member (55) at the lower end of the motor shaft (51); the electromagnet (56) attracts the magnetic member (55) when powered on; The electromagnet (56) is shaped like a bowl and has an opening facing upwards, surrounding the lower end of the motor shaft (51). When the electromagnet (56) is energized and in an attractive state with the magnetic member (55), the magnetic member (55) abuts against the inner bottom wall of the electromagnet (56), and the rotor just effectively corresponds to the stator.

2. The cleaning machine according to claim 1, characterized in that: The bottom of the housing (52) is provided with a through hole through which the lower end of the power supply shaft (51) extends downward and through which the accumulated water in the housing (52) is drained downward into the cavity of the electromagnet (56); the bottom of the cavity of the electromagnet (56) is provided with a drainage port arranged close to the edge.

3. The cleaning machine according to claim 2, characterized in that: A drainage impeller (58) is arranged in the cavity of the electromagnet (56) and is mounted on the motor shaft and rotates relative to the motor shaft to provide drainage power.

4. The cleaning machine according to claim 1, 2 or 3, characterized in that: The housing (52) comprises a first cavity (521) surrounding the outer periphery of the motor shaft and a second cavity (522) arranged outside the first cavity (521); the rotor is arranged in the first cavity (521) and the stator is arranged in the second cavity (522).

5. The cleaning machine according to claim 4, characterized in that: An upper bearing (511) for supporting the upper part of the motor shaft (51) is arranged at the top of the housing (52), and a lower bearing (512) for supporting the lower part of the motor shaft (51) is arranged at the bottom. A first gasket (513) arranged close to the upper end of the rotor and a second gasket (514) arranged close to the lower end of the rotor are sleeved on the outer periphery of the motor shaft (51). A first gap (501) is defined between the first gasket (513) and the upper bearing (511), and a second gap (502) is defined between the second gasket (514) and the lower bearing (512).

6. The cleaning machine according to claim 4, characterized in that: The motor further comprises a graphite component (57), which is arranged at the lower end of the rotor (53), between the rotor (53) and the motor shaft (51), and close to the lower bearing (512).

7. The cleaning machine according to claim 1, 2 or 3, characterized in that: The impeller assembly (4) comprises an upper impeller (41) and a lower impeller (42); the spray arm has a first accommodating chamber (10) for mounting the upper part of the upper impeller (41); the upper part of the pump casing (2) has a second accommodating chamber (20) for mounting the lower part of the upper impeller (41); a first water inlet for supplying water into the second accommodating chamber (20) is provided on the side wall of the pump casing (2); the lower part of the pump casing (2) has a third accommodating chamber (30) for mounting the lower impeller (42); a second water inlet and a water outlet are provided on the side wall and / or the bottom wall of the pump casing (2); a first spacing is provided between the top edge of the lower impeller (42) and the inner top wall of the third accommodating chamber (30); and a second spacing is provided between the bottom edge of the lower impeller (42) and the inner bottom wall of the third accommodating chamber (30).

8. A method for adaptively adjusting the stability performance of a cleaning machine, characterized in that The following steps are involved: Water is introduced into the box body (1). After the water is introduced, the electromagnet (56) is powered off, the motor is operated, and the impeller assembly (4) is driven to rotate, so that the water at the bottom of the box body (1) is continuously drawn into the spray arm (3) and sprayed upward; During the cleaning process, the motor (5) detects its own power state in real time. When the motor (5) speed reaches the set maximum speed, the motor power decreases by more than 10W, and this state is maintained for at least 10 seconds, it is determined that a large amount of foam is generated inside the box, the water flow inside the pump casing has entrained an uncontrollable amount of foam, and the impeller assembly (4) and the motor rotor are moving up and down; at this time, the electromagnet (56) is energized to attract the magnetic part (55) at the bottom of the motor shaft, and the motor shaft and the impeller assembly (4) thereon are positioned, so that the magnetic field between the motor rotor and the stator is always kept stable in the effective area, and the impeller assembly (4) runs smoothly, thereby stabilizing the water flow state in the pump casing.

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