Control method of drainage device, drainage device and household appliance

Abstract

The invention relates to the technical field of household appliances, and discloses a drainage device control method, a drainage device and a household appliance, the drainage device comprises a sleeve, a pump pushing part, a sealing part and a driving device for driving the pump pushing part to rotate, one end of the sleeve is provided with a water inlet, and the other end of the sleeve is provided with a water outlet; the pump pushing piece is coaxially arranged in the sleeve, and a spiral piece is arranged in the pump pushing piece. The sealing piece is arranged in the sleeve and used for closing the water outlet; the sealing piece is connected with the pump pushing piece, the pump pushing piece is driven by the driving device to rotate and drives the sealing piece to move in the direction away from the water outlet under the counter-acting force of water, and the water outlet is opened; starting the driving device, and monitoring the current of the driving device; when the current of the driving device has the first inflection point in the descending stage, the current of the driving device is increased, so that the pump pushing piece continuously drives the sealing piece to move in the direction away from the water outlet, the situation that the pump pushing piece drives the sealing piece to fall downwards to seal the water outlet is avoided, and the situation of drainage failure is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and particularly to a control method for a drainage device, a drainage device, and a household appliance. Background Art

[0002] The drainage methods of washing machines are divided into two categories: upper drainage and lower drainage.

[0003] Upper drainage means lifting the drain pipe and then using a drainage pump to pump the water in the washing machine to a high place and then discharging it. This drainage method has a wide range of applicable occasions, that is, it can drain water upwards or downwards, and the drainage speed is fast. However, it cannot drain all the water, there is always a certain residue, which is likely to cause bacteria and mildew to grow in the barrel, and the noise is also relatively large. Lower drainage means that the drain pipe does not need to be lifted and is directly inserted into the floor drain, and the water path is opened by an electromagnetic valve to drain water by gravity. Although this drainage method does not store water and the noise is relatively small, it can only drain water downwards and the drainage speed is slow.

[0004] When using a drainage pump to pump water for lower drainage, since the drainage pump does not have a water path cutoff function, in order to prevent the washing machine from draining water while filling water, the drain pipe must be lifted a certain distance and then lowered. Therefore, there is an urgent need for a drainage device that can not only perform upper drainage, but also has a fast drainage speed, low noise and does not require the drain pipe to be lifted during lower drainage. However, at present, when the driving device of the drainage device is started, the seal of the drainage device will automatically fall uncontrollably, resulting in drainage failure. Summary of the Invention

[0005] The purpose of the present invention is to provide a control method for a drainage device, a drainage device, and a household appliance, which solves the technical problem that when the driving device of the existing drainage device is started, the seal of the drainage device will automatically fall uncontrollably, resulting in drainage failure.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] The present invention provides a control method for a drainage device. The drainage device includes a sleeve, a pump pusher, a seal, and a driving device for driving the pump pusher to rotate. One end of the sleeve has a water inlet, and the other end has a water outlet; the pump pusher is coaxially arranged inside the sleeve, and the pump pusher includes spiral fins; the seal is arranged inside the sleeve to close the water outlet; the seal is connected to the pump pusher, and the pump pusher rotates under the drive of the driving device and drives the seal to move away from the water outlet under the reaction force of water, opening the water outlet.

[0008] The control method for the drainage device includes the following steps:

[0009] The driving device is started, and the current of the driving device is monitored;

[0010] When a first inflection point appears in the descending stage of the current of the driving device, the current of the driving device is increased.

[0011] When the control method of the drainage device detects that a first inflection point appears in the descending stage of the current of the driving device, the current of the driving device is increased, so that the pump pusher continues to drive the seal to move away from the water outlet direction to open the water outlet, avoiding the pump pusher driving the seal to fall downward to seal the water outlet, and avoiding the situation of drainage failure of the drainage device.

[0012] As a preferred scheme of the control method of the above drainage device, when a first inflection point appears in the descending stage of the current of the driving device, increasing the current of the driving device includes the following steps:

[0013] Increase the voltage of the driving device or increase the frequency of the driving device.

[0014] By increasing the voltage of the driving device or increasing the frequency of the driving device, it is convenient to adjust the rotation speed of the driving device.

[0015] As a preferred scheme of the control method of the above drainage device, when a first inflection point appears in the descending stage of the current of the driving device, the current of the driving device is increased to a preset current value so that the seal is in a stable state of opening the water outlet.

[0016] When a first inflection point appears in the descending stage of the current of the driving device, the current of the driving device is increased to a preset value, so that the seal can be stable in the state of opening the water outlet, avoiding the situation of drainage failure caused by seal control failure.

[0017] As a preferred scheme of the control method of the above drainage device, when a first inflection point appears in the descending stage of the current of the driving device, the current of the driving device is continuously increased; or the current of the driving device is increased intermittently.

[0018] When a first inflection point appears in the descending stage of the current of the driving device, continuously increasing the current of the driving device or intermittently increasing the current of the driving device can rapidly increase the current of the driving device, so that the pump pusher and the seal move upward at a faster speed.

[0019] As a preferred scheme of the control method of the above drainage device, when a first inflection point appears in the descending stage of the current of the driving device, the current of the driving device is increased, and the pump pusher drives the seal to move away from the water outlet direction. When the top of the pump pusher rubs against the sleeve, a second inflection point appears in the current of the driving device, and at this time, the current of the driving device is decreased.

[0020] When the top end of the pump pusher rubs against the sleeve, a second inflection point appears in the current of the driving device. At this time, the current of the driving device is reduced to avoid continuous friction between the top end of the pump pusher and the sleeve.

[0021] As a preferred solution of the control method of the above drainage device, when the pump pusher rubs against the sleeve, a second inflection point appears in the current of the driving device. At this time, the current of the driving device is reduced to a preset current value so that the seal is in a stable state of opening the water outlet.

[0022] When a second inflection point appears in the current of the driving device, the current of the driving device is reduced to a preset current value at this time, so that the seal is in a stable state of opening the water outlet, so that the top end of the pump pusher does not rub against the sleeve, and the seal stably opens the water outlet.

[0023] As a preferred solution of the control method of the above drainage device, the driving device includes:

[0024] A rotor, the rotor is arranged on the outer peripheral wall of the pump pusher;

[0025] A stator, the stator is arranged on the outer peripheral wall of the sleeve, a current is passed through the stator, and the pump pusher rotates under the magnetic force driving action of the stator through the rotor.

[0026] The pump pusher rotates under the magnetic force driving action of the stator through the rotor, so as to drive the lifting of the seal. The driving device has a simple structure and is easy to control.

[0027] As a preferred solution of the control method of the above drainage device, the rotor includes a plurality of permanent magnets, and the permanent magnets are evenly distributed along the outer periphery of the pump pusher;

[0028] The stator includes a plurality of iron cores wound with coils, the iron cores are evenly distributed along the outer periphery of the sleeve, and a current is passed through the coils.

[0029] The present invention also provides a drainage device, which is controlled by the control method of the above drainage device. The drainage device includes a sleeve, a pump pusher and a seal. One end of the sleeve has a water inlet, and the other end has a water outlet; the pump pusher is coaxially arranged inside the sleeve, and the inside of the pump pusher has spiral fins; the seal is arranged inside the sleeve to close the water outlet; the seal is connected to the pump pusher, and the pump pusher rotates under the drive of the driving device and drives the seal to move away from the water outlet under the reaction force of water, opening the water outlet.

[0030] The drainage device is controlled by the above-mentioned control method of the drainage device, which can prevent the pump pusher from driving the seal to fall downward to seal the water outlet, thus avoiding the situation of drainage failure of the drainage device.

[0031] The present invention also provides a household appliance, including the above-mentioned drainage device.

[0032] Through the above-mentioned drainage device, the household appliance can effectively discharge water, avoid the situation of control failure during the drainage process, and improve the user experience of the household appliance.

[0033] Advantages of the present invention:

[0034] For the control method of the drainage device proposed by the present invention, when the control method of the drainage device detects that the current of the driving device appears at the first inflection point during the descending stage, it increases the current of the driving device, so that the pump pusher continues to drive the seal to move away from the water outlet direction to open the water outlet, preventing the pump pusher from driving the seal to fall downward to seal the water outlet, and avoiding the situation of drainage failure of the drainage device.

[0035] For the drainage device proposed by the present invention, which is controlled by the above-mentioned control method of the drainage device, it can prevent the pump pusher from driving the seal to fall downward to seal the water outlet, thus avoiding the situation of drainage failure of the drainage device.

[0036] For the household appliance proposed by the present invention, through the above-mentioned drainage device, it can effectively discharge water, avoid the situation of control failure during the drainage process, and improve the user experience of the household appliance. Description of the drawings

[0037] Figure 1 is a schematic diagram of the drainage device provided by the present invention when the water outlet is blocked in the initial state;

[0038] Figure 2 is a schematic diagram of the drainage device provided by the present invention driving the connecting piece upward;

[0039] Figure 3 is a schematic diagram of the drainage device provided by the present invention driving the seal upward to open the water outlet;

[0040] Figure 4 is a schematic diagram of the structure of the seal provided by the present invention; [[ID=’38]]

[0041] Figure 5 is a cross-sectional view of the driving device provided by the present invention;

[0042] Figure 6 is a flowchart of the control method of the drainage device provided by the present invention;

[0043] Figure 7It is the current-time curve graph of the transmission driving device provided by the present invention and the driving device of this embodiment.

[0044] In the figure:

[0045] 100, water inlet joint;

[0046] 200, stator; 210, magnetic isolation cover; 220, coil; 230, iron core;

[0047] 300, rotor; 310, permanent magnet; 320, fixed groove;

[0048] 400, pump push member; 410, pump push cylinder; 420, spiral fin;

[0049] 500, connecting member; 510, connecting column; 520, limiting ball;

[0050] 600, sleeve; 610, housing body; 620, upper cover; 630, lower cover; 631, connecting section; 632, sealing section; 633, water outlet joint;

[0051] 700, seal; 710, conical cap; 711, cone; 712, protruding column; 713, frustum cavity; 714, cylindrical cavity; 720, spherical seat; 721, blind hole; 730, sealing ring. Detailed implementation manners

[0052] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0053] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the present invention, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the case where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0055] In the description of this embodiment, the orientation or positional relationships such as "up", "down", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0056] Embodiment 1:

[0057] As Figures 1 to 3 shown, this embodiment provides a drainage device for household appliances, including a sleeve 600, a pump pusher 400, a seal 700, and a driving device for driving the pump pusher 400 to rotate. One end of the sleeve 600 has a water inlet, and the other end has a water outlet; the pump pusher 400 is coaxially arranged inside the sleeve 600, and the pump pusher 400 includes a spiral blade 420; the seal 700 is arranged inside the sleeve 600 to close the water outlet; the seal 700 is connected to the pump pusher 400, and the pump pusher 400 rotates under the drive of the driving device and drives the seal 700 to move away from the water outlet direction under the reaction force of water, opening the water outlet.

[0058] The drainage device for household appliances provided in this embodiment not only has the function of an ordinary drainage pump to enable the household appliances to perform upward drainage, but also has the function of blocking the water path so that the household appliances do not need to raise the drainage pipe when performing downward drainage, can select upward drainage or downward drainage according to the needs of users, and can also take into account the drainage speed and noise, improving the user experience.

[0059] This embodiment also provides a household appliance, which includes the above-mentioned drainage device for household appliances. The household appliance in this embodiment can be either a laundry treatment device such as a washing machine or a washing and drying integrated machine, or a domestic device that needs to drain water such as a dishwasher, a water purifier, or a water softener. Next, taking the installation of the drainage device on a washing machine as an example for illustration.

[0060] The drainage device in this embodiment includes a sleeve 600, a pump pusher 400, a seal 700, and a driving device for driving the rotation of the pump pusher 400. The driving device includes a stator 200 and a rotor 300. The stator 200 is installed outside the sleeve 600 and can be fixedly connected to the sleeve 600; the rotor 300 is distributed circumferentially around the pump pusher 400 and fixedly connected thereto. A connecting member 500 is connected to the bottom of the pump pusher 400, and the connecting member 500 is movably restricted within the seal 700.

[0061] Specifically, the sleeve 600 includes a housing body 610, an upper cover 620 provided on the upper part of the housing body 610, and a lower cover 630 provided on the lower part of the housing body 610. An inlet joint 100 is inserted into the upper cover 620. The upper end of the lower cover 630 is a cylindrical connecting section 631 that matches the sleeve 600. The middle part of the lower cover 630 is an inverted frustum-shaped sealing section 632, and the lower end of the lower cover 630 is a smaller-diameter outlet joint 633 that extends downward.

[0062] Optionally, the stator 200 includes a plurality of iron cores 230 wound with coils 220, and the iron cores 230 are evenly distributed along the outer periphery of the sleeve 600. A magnetic shielding cover 210 is provided outside the iron cores 230 of the stator 200 to prevent the magnetic field generated when the stator 200 is powered on from leaking, affecting the operation of other components and reducing the efficiency of the drainage device; the iron cores 230 are formed by laminating multiple layers of silicon steel sheets. The magnetic shielding cover 210 is a circular ring-shaped sleeve structure and can be made of zinc alloy or plastic material containing zinc alloy powder. There are a plurality of iron cores 230 evenly distributed along the outer periphery of the sleeve 600. When the coil 220 is energized, a plurality of adjacent iron cores 230 generate magnetic fields with opposite polarities, and a plurality of opposite iron cores 230 generate the same magnetic field.

[0063] Optionally, the rotor 300 includes a plurality of permanent magnets 310 evenly distributed circumferentially around the pump pusher 400, and the number thereof is the same as that of the iron cores 230. Specifically, a plurality of fixing grooves 320 are evenly distributed on the outer peripheral wall of the pump pusher 400, and the plurality of permanent magnets 310 are fixed to the pump pusher 400 by being installed in the fixing grooves 320. The fixing grooves 320 can be a separate structure or can be machined on the pump pusher 400. In the figure, the fixing grooves 320 are separately provided.

[0064] Optionally, there is also a heat insulation layer that is not marked in the figure but needs to be configured. Each permanent magnet 310 is seamlessly wrapped with a heat insulation layer outside to prevent the permanent magnet 310 from failing due to the discharge of hot water during special programs of the washing machine, such as drum cleaning, disinfection and boiling washing, etc. It should also be noted here that the permanent magnets 310 shown in the figure are only for illustration and do not represent the actual magnetic pole directions.

[0065] Optionally, the pump pusher 400 includes a pump pusher cylinder 410 and a spiral vane 420. The pump pusher cylinder 410 is a cylindrical sleeve structure, preferably made of a non-metallic material. One reason is that it can reduce the weight and driving resistance, and in addition, it can also avoid the generation of eddy currents in the pump pusher cylinder 410 when the magnetic field of the stator 200 changes, consuming the magnetic field strength used to drive the rotor 300. The water inlet joint 100 can be inserted into the pump pusher cylinder 410, which can limit the skew of the pump pusher 400 when not in use. A spiral vane 420 is fixedly installed inside the pump pusher cylinder 410. The spiral vane 420 is a structure that is integrally connected. The wall thickness at the connection with the inner wall of the pump pusher cylinder 410 is the thickest, where the bearing capacity is the largest. Since the center has the smallest bearing capacity and is the thinnest, the overall weight can be reduced. Preferably, the pump pusher cylinder 410 and the spiral vane 420 are integrally injection-molded and demolded by screw. This can reduce the production process, improve efficiency, have higher strength, and also reduce noise and resistance compared to assembly molding.

[0066] Since both the rotor 300 and the pump pusher 400 are immersed in water during use, there is no need for heat dissipation and lubrication.

[0067] Optionally, the pump pusher 400 is originally a hollow structure, and a connecting piece 500 is installed here. The connecting piece 500 connects the pump pusher 400 and the seal 700. When drainage is required, the pump pusher 400 rotates and rises, lifting the seal 700, opening the valve and driving the water flow to drain from the washing machine. When drainage is not required, the pump pusher 400 and its fixedly installed rotor 300 are pressed downward under the transmission of the connecting piece 500, transmitting the pressure to the seal 700, thereby making the seal 700 have better sealing performance and ensuring sealing reliability.

[0068] Specifically, the connecting piece 500 includes a connecting column 510 and a limiting ball 520. The upper end of the connecting column 510 is spherical to reduce the water resistance. The connecting column 510 is arranged at the center of the spiral vane 420, where the water flow is the smallest and there is no eccentricity during rotation. The connecting column 510 can also be integrally injection-molded with the entire pump pusher 400. The bottom of the connecting column 510 can be connected to the limiting ball 520 by threads. The limiting ball 520 is movably installed inside the seal 700. When the rotor 300 drives the pump pusher 400 and the connecting piece 500 to rotate, the limiting ball 520 can reduce the rotational resistance with the seal 700; when the rotor 300 drives the pump pusher 400 to rotate, the pump pusher 400 will rise under the reverse force of the water. When it rises, it drives the connecting piece 500 to rise, and the limiting ball 520 drives the seal 700 to rise, opening the drainage channel.

[0069] Such as Figure 4As shown, the seal 700 includes a vertically movable part, that is, a conical cap 710 and a spherical seat 720. The axis of the conical cap 710 has a cavity. The bottom of the cavity is a cylindrical cavity 714, and the upper part is a frustum cavity 713. The cylindrical cavity 714 and the bottom of the frustum cavity 713 can accommodate the limit ball 520, and the upper middle part of the frustum cavity 713 can prevent the limit ball 520 from passing through. The settings of the cylindrical cavity 714 and the frustum cavity 713 can prevent the rotor 300 from bearing the weight of the seal 700 at the initial stage of startup. The conical cap 710 includes a conical body 711 and a protruding cylinder 712 protruding downward from the plane at the bottom of the conical body 711. External threads are machined on the outer periphery of the protruding cylinder 712. The conical outer surface of the conical body 711 can reduce the water flow resistance and disperse the downward water flow in all directions. The spherical seat 720 is part of a semi-spherical or spherical shape. A blind hole 721 is provided on the upper surface of the spherical seat 720, and internal threads are machined in the blind hole 721 to cooperate with the external threads of the protruding cylinder 712 to achieve disassembly, assembly and fixation. Preferably, both are made of galvanized steel or stainless steel to prevent rust from affecting the seal.

[0070] Optionally, a sealing ring 730 is provided on the inner wall of the sealing section 632 of the sleeve 600. The sealing ring 730 is made of elastic rubber or silica gel material, and the spherical seat 720 can be in sealing contact with the sealing ring 730. In this way, when the stator 200 is not powered on, the rotor 300 and the pump pusher 400 jointly apply the gravity to the seal 700 through the connector 500, and the setting of the sealing ring 730 makes the seal more reliable.

[0071] When drainage is required, power is supplied to the stator 200, and the rotor 300 drives the pump pusher 400 and the connector 500 to rotate. At first, due to the misalignment of the permanent magnet 310 and the iron core 230, the efficiency is not high. When the speed gradually increases, under the reaction force of the water, the rotor 300 drives the pump pusher 400 and the connector 500 to rise together. The efficiency gradually returns to normal, and at the same time, the water passage is opened to allow the water to drain smoothly.

[0072] Reasonably design the drainage power so that the upward reaction force generated by the rated drainage power is equal to the gravity of the rotor 300, the pump pusher 400, the connector 500 and the movable seal 700, so that the water passage can be opened and the above-mentioned whole will not touch the upper cover 620.

[0073] During normal operation, the whole composed of the rotor 300, the pump pusher 400 and the connector 500 will be stably located at the center of the housing 610 and will not hit the wall, saving bearings here.

[0074] When the drainage device is just started, the whole composed of the rotor 300, the pump pusher 400 and the connecting piece 500 rotates slowly. The bottom of the limit ball 520 is in point contact with the bottom wall of the blind hole 721 of the spherical seat 720, and the resistance is very small. As the rotational speed of the whole composed of the rotor 300, the pump pusher 400 and the connecting piece 500 increases, the whole rises, and the limit ball 520 is in line contact with the inner frustum cavity 713 of the conical cap 710, and the frictional force increases, which will lift the movable seal 700 and rotate with the whole body.

[0075] To form a driving device, the driving device also has a driving circuit not shown in the figure. The driving circuit includes a power supply module and a driving module. The power supply module converts alternating current into direct current with the same voltage and different current directions in multiple paths. The driving module is responsible for supplying power to different coils 220 at appropriate times for the above-mentioned direct current. To determine the power supply timing, a plurality of Hall elements are also provided at positions corresponding to the height range of the permanent magnet 310 on the periphery of the housing body 610, for determining whether the permanent magnet 310 has moved to the corresponding position.

[0076] Usually, a pair of opposite polarities of the permanent magnet 310 along the radial direction are the same, and a pair of adjacent ones along the circumferential direction are opposite. To simplify the control logic, it can be set that a pair of coils 220 opposite along the radial direction are wound with the same wire. After the current is applied to the coils 220, the magnetic field polarities generated by the coils 220 are the same.

[0077] As Figure 5 shown, in application, all the coils 220 are connected with the same wire. In this way, as long as the current direction is switched for a pair of connection terminals, the magnetic pole polarities shown in the figure can be reversed. In this way, the power supply module only needs to rectify a pair of direct current power supplies with different directions, and only 1 Hall element needs to be set, and 2 are set for reliability. When two are set, only the signal of one Hall element needs to be obtained to switch the current.

[0078] When the driving device starts, assuming that the input current generates a magnetic field as described above, taking the No. 1 coil as an example, the magnetic field generated at its top attracts the permanent magnet 310 on its right side to approach and repels the permanent magnet 310 on its left side to move away. The remaining coils 220 synchronously produce similar effects, causing the rotor 300 to rotate clockwise in the figure. When the rotation angle of the rotor 300 aligns with the stator 200, normally it will be firmly adsorbed by the magnetic field generated by the coil 220. However, due to the fact that the rotor 300 has a certain mass and speed and thus has angular momentum, it will cross the position of the coil 220 and continue to rotate forward by a small angle. While the coil 220 is aligning with the permanent magnet 310, the Hall element can sense the position of the permanent magnet 310 and immediately send a signal to the drive module. The drive module immediately switches the current direction. At this time, the magnetic pole of the No. 1 coil is reversed, that is, the magnetic pole at its top is switched to S. For the permanent magnet 310 that has just passed its alignment position due to inertia, the suction force immediately becomes a repulsive force, continuing to push the rotor 300 to rotate. The same principle applies to the other coils 220 and the permanent magnets 310 of the rotor 300, driving the rotor 300 to run continuously.

[0079] When the drainage device of this solution is in use, the water in the washing machine drain pipe enters the drainage device through the water inlet in the sleeve 600. The pump pusher 400 rotates relative to the sleeve 600 to drive the water flow towards the water outlet. Since the blades on the inner peripheral wall of the pump push cylinder 410 are spiral blades 420, foreign matters such as lint that enter the drainage device along with the water flow can continue to be discharged from the drainage device through the spiral blades 420 and will not wind around the spiral blades 420 to affect drainage. This solution does not require a lint filtering device, which not only saves costs but also avoids the user from cleaning the lint filtering device regularly.

[0080] As Figure 1 shown, when draining water, the power supply module energizes the stator 200, and the rotor 300 drives the pump pusher 400 and the connecting member 500 to rotate under the magnetic driving force generated by the stator 200. Initially, due to the misalignment between the permanent magnet 310 and the iron core 230, the rotation speed is not high. At this time, the bottom of the limit ball 520 is in point contact with the bottom wall of the blind hole 721 of the spherical seat 720, and the resistance is very small.

[0081] As Figure 2 shown, when the speed gradually increases, under the reaction force of the water, the rotor 300 drives the pump pusher 400 and the connecting member 500 to rise together. At this time, the limit ball 520 on the connecting member 500 moves upward along the frustum cavity 713. During this process, the seal 700 remains stationary and is still in the state of closing the water outlet.

[0082] As Figure 3As shown, when it rises to a certain height, the connecting member 500 is blocked by the upper end of the frustum cavity 713, and the pump pusher 400 also drives the seal 700 to rotate and move upward. Thereby, the seal 700 opens the water passage, allowing water to flow through the water outlet and drain out of the sleeve 600.

[0083] When the drainage is completed, the power module is powered off, and the pump pusher 400, the connecting member 500, and the seal 700 descend under the action of gravity. The outer periphery of the seal 700 abuts against the inner peripheral wall of the sealing section 632, closing the water outlet.

[0084] In the solution of this embodiment, the drainage power can be reasonably designed so that the upward reaction force generated by the rated drainage power is equal to the total gravity of the rotor 300, the pump pusher 400, the connecting member 500, and the seal 700, thereby enabling the water passage to be opened and the above-mentioned whole not to touch the upper end of the sleeve 600.

[0085] In addition, in this solution, when the drainage device is operating normally, the whole composed of the rotor 300, the pump pusher 400, the connecting member 500, and the seal 700 will stably be located at the center of the sleeve 600 and will not touch the inner peripheral wall of the sleeve 600. Bearings can also be saved here, reducing the overall cost of household appliances.

[0086] When the above-mentioned drainage device is used in a washing machine with downward drainage, the water outlet of the sleeve 600 is directly connected to the floor drain through a hose for drainage. When drainage is required, the seal 700 moves upward to open the water outlet for drainage. When the drainage is completed, the seal 700 closes the drain port, and normal water inlet can be achieved without raising the water pipe. Compared with a washing machine using a solenoid valve, the drainage is faster.

[0087] When the above-mentioned drainage device is used in a washing machine with upward drainage, the communicating pipe connected to the sleeve 600 is lifted upward, and the spiral blade 420 in the drainage device rotates to drive the water flow to drain out of the sleeve 600 and flow through the communicating pipe. Compared with a washing machine using an ordinary drainage pump, the noise is lower and there is no need to clean lint.

[0088] Since the household appliance in this embodiment uses the drainage device of the above embodiment. On the one hand, it can be used in household appliances with upward drainage and can also be used in household appliances with downward drainage, thereby expanding the scope of use. On the other hand, foreign matters such as lint in the washing water can directly flow out through the drainage pump and will not wind around the spiral blade 420 to affect drainage. This solution does not require a lint filtering device, which not only saves costs but also avoids the user from cleaning the lint filtering device regularly.

[0089] Embodiment Two:

[0090] As Figure 7As shown in the figure, when the traditional driving device starts, at the moment of starting and powering on, since the rotor is not rotating, when the current passes through the coil 220, the generated magnetic field does not do external work, and all the power is consumed by the resistance of the coil 220. The current will increase rapidly, that is, at time point t1, the current rapidly increases to i1. After time point t1, the rotor starts to rotate and consumes the power of the driving device. As the rotational speed increases, the current will rapidly decrease. When the rotational speed of the rotor is constant, that is, at time node t3, the current will no longer decrease and operates at a constant current. In the present invention, as the rotational speed of the rotor 300 increases, the water in the sleeve 600 will give a reaction force to the pump pusher 400, causing the rotor 300, the pump pusher 400, the connecting member 500, and the seal 700 to move upward, thereby opening the drain port. A water flow from top to bottom is formed in the sleeve 600. Since the whole composed of the rotor 300, the pump pusher 400, the connecting member 500, and the seal 700 is in the water, it will immediately be carried downward by the water flow and close the drain port again. This cycle repeats, resulting in extremely low drainage efficiency or drainage failure. After the rotor 300 descends, the part of the magnetic field generated by the stator 200 received and converted into kinetic energy by the rotor 300 decreases, and the current will do work and generate heat again through the resistance of the coil 220, which is manifested as an increase in the current again from the parameters.

[0091] To avoid the above problems, as Figure 6 shown, this embodiment provides a control method for a drainage device. The control method for the drainage device includes the following steps:

[0092] S11. Start the driving device and monitor the current of the driving device;

[0093] S12. When the current of the driving device appears the first inflection point during the descending stage, increase the current of the driving device.

[0094] When the control method for this drainage device detects that the current of the driving device appears the first inflection point during the descending stage, it increases the current of the driving device, so that the pump pusher 400 continues to drive the seal 700 to move away from the water outlet direction to open the water outlet, avoiding the pump pusher 400 driving the seal 700 to fall downward to seal the water outlet, and avoiding the situation of drainage failure of the drainage device.

[0095] When the current of the driving device appears the first inflection point during the descending stage, increasing the current of the driving device includes the following steps: increasing the voltage of the driving device or increasing the frequency of the driving device, that is, the rotational speed of the driving device can be changed by changing the voltage or frequency of the driving device. By increasing the voltage of the driving device or increasing the frequency of the driving device, it is possible to facilitate the adjustment of the rotational speed of the driving device, make it rise rapidly, and overcome and offset the speed of being carried downward by the water flow.

[0096] When the current of the driving device has a first inflection point during the descending stage, increase the current of the driving device to a preset current value, so that the seal 700 is in a stable state of opening the water outlet, thereby avoiding the situation of drainage failure caused by the control failure of the seal 700; moreover, the pump pusher 400 will not rub against the upper cover 620 of the sleeve 600.

[0097] It should be noted that: the introduction of the preset current value can make the upward reaction force generated by the drainage equal to the gravity of the rotor 300, the pump pusher 400, the connecting member 500 and the movable seal 700, so that the waterway can be opened and the above-mentioned whole will not touch the upper cover 620.

[0098] When the current of the driving device has a first inflection point during the descending stage, continuously increase the current of the driving device; or intermittently increase the current of the driving device, which can rapidly increase the current of the driving device, so that the pump pusher 400 and the seal 700 move upward at a faster speed, overcoming and offsetting the speed of being carried downward by the water flow.

[0099] When the current of the driving device has a first inflection point during the descending stage, increase the current of the driving device. The pump pusher 400 drives the seal 700 to move away from the water outlet. When the top end of the pump pusher 400 rubs against the upper cover 620 of the sleeve 600, a second inflection point appears in the current of the driving device. At this time, reduce the current of the driving device. When the top end of the pump pusher 400 rubs against the sleeve 600, a second inflection point will appear in the current of the driving device. At this time, reduce the current of the driving device to avoid the continuous friction between the top end of the pump pusher 400 and the sleeve 600.

[0100] When the pump pusher 400 rubs against the sleeve 600, a second inflection point appears in the current of the driving device. At this time, reduce the current of the driving device to the preset current value, so that the seal 700 is in a stable state of opening the water outlet, so that the top end of the pump pusher 400 does not rub against the sleeve 600, and the seal 700 stably opens the water outlet.

[0101] Specifically, such as Figure 7As shown, at the moment of starting and powering on, since the rotor 300 is not rotating, when current passes through the coil 220, the generated magnetic field does not do external work, and all the power is consumed by the resistance of the coil 220. The current will increase rapidly, that is, at time point t1, the current rapidly increases to i1. After time point t1, when the rotor 300 starts to rotate, the current decreases as the speed of the rotor 300 increases. When the speed of the rotor 300 is high enough, the rotor 300 drives the pump pusher 400 to rotate. Under the reaction force of water, the pump pusher 400 will open the seal 700 to allow water flow to be generated inside the sleeve 600. Since the rotor 300 and the pump pusher 400 are in the water flow, they will move downward with the water flow. During the downward movement, the magnetic flux received by the rotor 300 from the stator 200 decreases, and the external work done by the magnetic field decreases, so the current will increase again (that is, the first inflection point occurs at time point t2 in the figure). However, this increase is not enough to quickly increase the magnetic field to drive the rotor 300 to operate. At this time, a larger current needs to be input, that is, the current is increased to quickly increase the power. As the magnetic field strength of the stator 200 increases rapidly, the magnetic flux received by the rotor 300 due to its descent is compensated. The rotor 300 will rotate quickly to push the water flow, and the reaction force of the water flow causes the rotor 300 to rise. When the combined body of the rising rotor 300 and the pump pusher 400 touches the upper cover 620 of the sleeve 600, the friction increases and the rotational speed decreases, and the current will increase rapidly again. The time point at this time is t4. At this time, since the combined body of the rotor 300 and the pump pusher 400 has been rubbing against the upper cover 620, the current needs to be reduced to appropriately decrease the magnetic field strength of the stator 200. When it is reduced to the minimum stable operating current (the preset current value), that is, i5, by maintaining a constant input current, the drainage device can operate stably.

[0102] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A control method for a drainage device, characterized in that, The drainage device includes a sleeve (600), a pump pusher (400), a seal (700), and a driving device for driving the pump pusher (400) to rotate. One end of the sleeve (600) has a water inlet, and the other end has a water outlet. The pump pusher (400) is coaxially arranged inside the sleeve (600), and the pump pusher (400) includes spiral fins (420). The seal (700) is arranged inside the sleeve (600) to close the water outlet. The seal (700) is connected to the pump pusher (400). The pump pusher (400) rotates under the drive of the driving device and drives the seal (700) to move away from the water outlet under the reaction force of water, opening the water outlet. The control method of the drainage device includes the following steps: The driving device is started, and the current of the driving device is monitored. When a first inflection point appears in the descending stage of the current of the driving device, increase the current of the driving device.

2. The control method of the drainage device according to claim 1, wherein When a first inflection point appears in the descending stage of the current of the driving device, increasing the current of the driving device includes the following steps: Increase the voltage of the driving device or increase the frequency of the driving device.

3. The control method of the drainage device according to claim 1, characterized in that When a first inflection point appears in the descending stage of the current of the driving device, increase the current of the driving device to a preset current value so that the seal (700) is in a stable state of opening the water outlet.

4. The control method of the drainage device according to claim 1, characterized in that When a first inflection point appears in the descending stage of the current of the driving device, continuously increase the current of the driving device; or intermittently increase the current of the driving device.

5. The control method of the drainage device according to claim 1, characterized in that, When a first inflection point appears in the descending stage of the current of the driving device, increase the current of the driving device. The pump pusher (400) drives the seal (700) to move away from the water outlet. When the top of the pump pusher (400) rubs against the sleeve (600), a second inflection point appears in the current of the driving device. At this time, reduce the current of the driving device.

6. The control method of the drainage device according to claim 5, characterized in that, When the pump pusher (400) rubs against the sleeve (600), a second inflection point appears in the current of the driving device. At this time, reduce the current of the driving device to a preset current value so that the seal (700) is in a stable state of opening the water outlet.

7. The control method of the drainage device according to any one of claims 1-6, characterized in that The driving device includes: A rotor (300) arranged on the outer peripheral wall of the pump pusher (400); A stator (200) arranged on the outer peripheral wall of the sleeve (600). A current is passed through the stator (200), and the pump pusher (400) rotates under the magnetic force drive of the stator (200) through the rotor (300).

8. The control method of the drainage device according to claim 7, characterized in that, The rotor (300) includes a plurality of permanent magnets (310) uniformly arranged along the outer periphery of the pump pusher (400); The stator (200) includes a plurality of iron cores (230) wound with coils (220). The iron cores (230) are uniformly arranged along the outer periphery of the sleeve (600), and a current is passed through the coils (220).

9. Drainage device, characterized in that, Control is performed using the control method of the drainage device according to any one of claims 1-8. The drainage device includes a sleeve (600), a pump pusher (400), and a seal (700). One end of the sleeve (600) has a water inlet, and the other end has a water outlet. The pump pusher (400) is coaxially arranged inside the sleeve (600), and the inside of the pump pusher (400) has a spiral fin (420). The seal (700) is arranged inside the sleeve (600) to close the water outlet. The seal (700) is connected to the pump pusher (400). The pump pusher (400) rotates under the drive of the drive device and drives the seal (700) to move away from the water outlet direction under the reaction force of water, opening the water outlet.

10. A household appliance, characterized in that, It includes the drainage device according to claim 9.

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