WO2020211677A1

WO2020211677A1 - Washing machine water pump and washing machine

Info

Publication number: WO2020211677A1
Application number: PCT/CN2020/083440
Authority: WO
Inventors: 赵志强; 许升; 杨旭光
Original assignee: 青岛海尔洗衣机有限公司; 海尔智家股份有限公司
Priority date: 2019-04-17
Filing date: 2020-04-07
Publication date: 2020-10-22

Abstract

A washing machine water pump and a washing machine. The washing machine water pump comprises a control part, a motor part, and a pump part; the control part and the pump part are respectively fixed at two ends of the motor part; the control part internally comprises a control chamber (101); a control panel (102) is fixedly provided inside the control chamber (101); the control part is detachably connected to the motor part; and the control panel (102) is encased in the control chamber (101). The washing machine water pump uses a brushless direct-current motor and comprises an independent control part, and the control part, the motor part and the pump part are integrated as a whole. Therefore, the water pump, as a whole which can be controlled independently, can be mounted to different models of washing machines, is good in compatibility, and has a small overall volume, a wide range of applications, low noise, and high efficiency.

Description

Washing machine water pump and washing machine

Technical field

The invention belongs to the field of washing machines, in particular to a washing machine water pump and a washing machine, and more particularly to a DC brushless water pump.

Background technique

The washing machine is designed as a device for washing clothes by using electricity. Generally speaking, the washing machine includes: a tub for containing washing water; a washing tub, which is rotatably installed inside the tub; a pulsator, which is rotatably installed on the washing tub The bottom of the motor and clutch are configured to rotate the washing tub and pulsator. When the pulsator rotates, the laundry and washing water in the washing tub are stirred, thereby removing stains on the laundry. The washing machine also includes a drainage system, in which a drainage pump is used to drain the washed water in the washing machine through a drainage pipe.

At present, AC motor water pumps are mostly used in the drainage systems of washing machines. The working noise generated during the drainage process is relatively large, the flow rate is relatively small, and the efficiency is relatively low, which affects the comfort of the user during the washing process. In order to improve this situation, some washing machines use a DC brushless water pump, and a drive unit is provided in the main control board of the washing machine to adjust the working state of the DC brushless water pump. However, the control and drive of this type of water pump are integrated with the control panel of the washing machine. When applied to other washing machines, it needs to be replaced together with the control panel of the washing machine, which may cause incompatibility of the control panel and affect the application range of the water pump.

In view of this, the present invention is proposed.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a washing machine water pump and a washing machine. The washing machine water pump of the present invention adopts a DC brushless motor and has an independent control part. Therefore, the water pump is installed on different washing machines as a unit that can be individually controlled, with good compatibility, wide application range, low noise and high efficiency. The control method of the present invention judges whether air enters the pump and adjusts the speed, which can greatly reduce the noise of the water pump and ensure the normal operation of the water pump.

In order to solve the above technical problems, the basic idea of the technical solution adopted by the present invention is:

The first object of the present invention is to provide a washing machine water pump, which includes a control part, a motor part and a pump part. The control part and the pump part are respectively fixed at both ends of the motor part. The control part has a control chamber and is fixed in the control chamber. A control board is arranged, and the control part is detachably connected with the motor part to seal the control board in the control chamber.

In a further solution, the motor part includes a housing, and the control board is fixed at the rear end of the housing; the control part includes a control housing, and a control chamber with a side opening is formed in the control housing. The rear end surface of the casing is matched; the control casing is detachably connected with the casing.

In a further solution, a positioning structure is provided on the rear end surface of the casing, and/or the control board, and/or the control housing;

Preferably, the positioning structure includes a first convex portion, the first convex portion is located in the middle of the rear end of the casing and protrudes toward the control board in the axial direction; the middle of the control board is provided with the first convex The through hole matched with the part, the control board is sleeved on the first convex part through the through hole;

Preferably, the first protrusion is formed by protruding from the center of the rear end surface of the casing toward the side of the control board, and the inside of the first protrusion forms a cavity in which the end of the motor shaft is arranged.

In a further solution, an abutment structure is provided on the inner wall of the control housing, and the abutment structure is located in the middle of the inner wall of the control housing opposite to the opening, and protrudes toward the side of the housing relative to the inner wall of the control housing; After the shells are connected, the abutting structure abuts on the first protrusion.

In a further solution, a second convex portion is further provided on the rear end surface of the casing, and the second convex portion is located on the periphery of the first convex portion and is arranged concentrically with the first convex portion; The protrusion height of the first protrusion is smaller than the protrusion height of the first protrusion;

Preferably, after the control board is sleeved on the first convex portion, part of the surface of the control board is attached to the surface of the second convex portion.

In a further solution, a fixing boss is provided on the rear surface of the casing, a fixing hole is provided on the fixing boss, a connecting hole for the fixing member to pass through is provided on the control board, and the control board is positioned Afterwards, the fixing member passes through the connecting hole and is fixed to the fixing hole;

Preferably, the fixed boss is located on the periphery of the second convex part; more preferably, the fixed boss is arranged close to the edge of the rear end surface of the casing.

In a further solution, a limit structure is further provided on the inner peripheral side wall of the control housing, and the edge of the control board is matched with the limit structure, and the limit structure restricts the movement of the control board in the axial direction;

Preferably, the limiting structure is a limiting platform formed by recessing the inner peripheral side wall of the end of the control housing close to the opening in a direction away from the center, and the edge of the control board abuts against the surface of the limiting platform;

Preferably, the inner diameter of the opening of the control housing is larger than the outer diameter of the rear end surface of the housing, and the inner circumference of the opening of the control housing covers the outer circumference of the rear end of the housing.

In a further solution, the outer peripheral wall of the control casing and the casing is provided with a mutually matched connection structure;

Preferably, the connecting structure includes a clamping block arranged on the outer periphery of the control housing and a clamping hole arranged on the outer periphery of the housing. One side of the clamping block is fixed to the outer peripheral surface of the control housing, and the other side faces the outer periphery of the housing. The direction extends horizontally, and the extension end of the clamping block is provided with a protruding structure; after the control housing is connected to the casing, the protruding structure is inserted into the clamping hole.

In a further solution, a lead-out interface is provided on the control housing, a wiring terminal is installed in the lead-out interface, and the control board is connected to an external power source through the wiring terminal;

Preferably, a stator and a rotor are arranged in the casing, and the control board is connected to the stator through inner leads.

The second object of the present invention is to provide a washing machine having a washing machine water pump as described in any one of the above solutions or a combination of solutions, and the washing machine water pump is connected to the main control unit of the washing machine.

The third object of the present invention is to provide a method for controlling a washing machine water pump. The water pump includes a control board. The control board includes a detection unit, a drive unit and a control unit. The control method includes:

When the washing machine water pump is working, the control unit judges whether air has entered the water pump according to the current value detected by the detection unit, and if it determines that air has entered, it controls the driving unit to reduce the running speed of the water pump.

In a further solution, the detection unit detects the actual current value of the water pump, and the control unit compares the actual current value with the current critical value corresponding to the operating speed. If the actual current value is less than the current critical value, the control unit controls the drive unit to reduce the operating speed To the preset speed.

In a further scheme, when the pump is running at the operating speed N, the set current value of the airless state corresponding to the operating speed N is I, and the current critical value corresponding to the operating speed N is I*β, where β is less than 1 , Is the maximum allowable reduction factor;

Preferably, the range of the maximum allowable reduction coefficient β is 0.5-0.9.

In a further solution, when the control unit analyzes that the actual current value I1 is less than I*β, it determines that the amount of water in the water pump is too little and there is too much air, and then the drive unit is controlled to reduce the rotation speed to a preset rotation speed.

In a further solution, when the control unit analyzes that the actual current value I1 is equal to I, or is less than I and not less than I*β, the operation speed N is maintained to continue the operation.

In a further solution, reducing the operating speed to a preset speed includes: reducing the operating speed N to a preset speed M, where the preset speed M is a set speed value in an airless state corresponding to the actual current value I1.

In a further solution, the ratio of the set current value I to the operating speed N is a, and the ratio of the actual current value I1 to the preset speed M is b, where a is equal to b.

In a further solution, the detection unit, the drive unit and the control unit are integrated on the control board, the detection unit detects the actual current value and transmits the signal to the control unit, and the control unit compares the signal with the pre-stored current critical value after receiving the signal.

As a further solution, the washing machine water pump of the present invention has a control method as described in any one of the above solutions or a combination of solutions.

In a further solution, the washing machine water pump includes a control part, a motor part, and a pump part. The control part and the pump part are respectively fixed at both ends of the motor part. The control part has a control chamber, and the control panel is fixedly arranged in the control chamber. The part and the motor part are detachably connected to seal the control board in the control chamber.

After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

1. The washing machine water pump of the present invention adopts a DC brushless motor. The motor has an independent control part. The control part, the motor part and the pump part are integrated as a whole, so the water pump can be installed in different types of washing machines as a separately controllable whole It has good compatibility, small overall size, wide application range, low noise and high efficiency.

2. The control part and the motor part of the washing machine water pump of the present invention are connected in a detachable manner. The control board is fixed in the control chamber through a variety of positioning structures, fixing structures and limit structures. The fixing effect is good and no other fixing is required. The medium, such as glue, is fixed, so it not only saves costs, but also facilitates disassembly and assembly, and facilitates the maintenance of the control panel.

3. The control method of the present invention judges whether air enters the pump and adjusts the speed, which can greatly reduce the noise of the water pump and ensure the normal operation of the water pump.

The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

Description of the drawings

The accompanying drawings are used as a part of the present invention to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings in the following description are only some embodiments, and for those of ordinary skill in the art, other drawings can be obtained from these drawings without creative work. In the attached picture:

Figure 1 is a schematic diagram of the overall structure of the washing machine water pump of the present invention;

2 is a schematic diagram of the overall structure of the washing machine water pump of the present invention from another angle;

Figure 3 is a top view of the washing machine water pump of the present invention;

Figure 4 is a sectional view of the washing machine water pump of the present invention;

Figure 5 is a schematic diagram of an enlarged structure of the sealing ring of the water pump shaft of the washing machine of the present invention;

Figure 6 is a side view of the washing machine water pump of the present invention;

Figure 7 is a diagram of the relationship between the current and the rotation speed of the washing machine water pump of the present invention;

In the picture: 100 control enclosure, 101 control chamber, 102 control board, 104 abutment structure, 105 limit table, 106 connection terminal, 107 through hole, 108 connection hole, 109 fixing part, 110 clamping block, 111 lead wire interface;

200 chassis, 201 first protrusion, 202 second protrusion, 203 fixing boss, 204 fixing hole, 205 clamping hole, 206 stator, 207 rotor, 208 motor shaft, 209 front bearing, 210 rear bearing, 211 shaft Sealing ring, 212 outer sealing part, 213 inner sealing part, 214 first sealing contact part, 215 second sealing contact part, 216 cavity;

300 pump casing, 301 fixed structure, 302 water inlet, 303 water outlet, 304 impeller, 305 pump casing sealing ring.

It should be noted that these drawings and text descriptions are not intended to limit the scope of the invention in any way, but to explain the concept of the invention for those skilled in the art by referring to specific embodiments.

detailed description

In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention. , But not used to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the pointed device or element must have a specific orientation or a specific orientation. The structure and operation cannot therefore be understood as a limitation of the present invention.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise clearly specified and limited. For example, they can be fixed or detachable. Connected or integrally connected; it can be mechanically or electrically connected; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms in the present invention can be understood in specific situations.

Example one

As shown in Figures 1 to 6, this embodiment provides a washing machine water pump, including a control part, a motor part, and a pump part. The control part and the pump part are respectively fixed at both ends of the motor part, and the control part has a control chamber. 101. A control board 102 is fixedly arranged in the control chamber 101, and the control part is detachably connected with the motor part to seal the control board 102 in the control chamber 101.

In this embodiment, the water pump of the washing machine can be divided into three parts. The control part can realize independent detection and control. The motor part adopts a DC brushless motor. The water pump part has an impeller 304 which is driven by the motor to rotate and transport the liquid medium. In this way, the control part, the motor part and the pump part are integrated into a whole, so the water pump can be installed on different types of washing machines as a separately controllable whole, with good compatibility, small overall size, wide application range, low noise and efficiency high.

The control part and the pump part are respectively fixed at the two ends of the motor part. The specific positions can be as shown in the figure. From left to right, they are the control part, the motor part and the pump part. They can also be arranged in other orientations, such as up and down. In this way, the control part is far away from the pump part, which can prevent the leakage of the liquid medium transmitted in the pump part from affecting the control part, and ensure the safe operation of the water pump.

The control board 102 includes an integrated control unit, a detection unit, and a drive unit, which integrates detection and control functions. It is convenient for the water pump to be installed on different types of washing machines as a separately controllable whole, and its compatibility is greatly improved. The control part and the motor part are detachably connected to seal the control board 102 in the control chamber 101. This installation method facilitates the installation of the control board 102 and the disassembly and maintenance of the control board 102, which saves manpower and costs.

Specifically, the motor part includes a housing 200, and the control board 102 is fixed at the rear end of the housing 200; the control part includes a control housing 100, and a control chamber 101 that opens toward one side is formed in the control housing 100, The opening is matched with the rear surface of the casing 200; the control casing 100 and the casing 200 are detachably connected.

The housing 200 of the motor part is provided with various parts of the motor, specifically including: a stator 206, a rotor 207 and a motor shaft 208. The stator 206 is fixed in the housing 200 and is wound with coils; the rotor 207 is formed between the two stators 206 The rotor 207 is in a cavity and can rotate relative to the stator 206. The motor shaft 208 is installed in the middle of the casing 200 through a bearing, and the outer circumference of the motor shaft 208 is fixedly connected to the rotor 207. The front end of the motor shaft 208 is provided with a front bearing 209, and the rear end is provided with a rear bearing 210, so that the rotor 207 is completely suspended, which can improve the reliability during high-speed operation. The rear end of the motor shaft 208 is fixed to the rear end of the casing 200, and the front end of the motor shaft 208 penetrates the front end of the casing 200 into the pump casing 300 of the pump part, and is fixedly connected with the impeller 304 in the pump part. In this way, when the rotor 207 drives the motor shaft 208 to rotate, the motor shaft 208 drives the impeller 304 to rotate.

In this solution, the control board 102 is fixed at the rear end of the housing 200 of the motor section, and then the control housing 100 of the control section is used to cover the control board 102, and the control housing 100 is detachably fixed to the rear end of the housing 200. The control board 102 plays a role of protection and further fixing. The opening of the control chamber 101 formed in the control housing 100 faces the rear end of the casing 200, and may be the same size as the rear end surface, or may be slightly larger than the periphery of the rear end surface to facilitate sealing the control board 102. In this way, after the control board 102 is fixed and the control housing 100 is connected to the housing 200, the control part and the motor part become a whole, which is beneficial to the overall use of the water pump.

Further, the control housing 100 is provided with a lead-out interface 111, and a wiring terminal 106 is installed in the lead-out interface 111, and the control board 102 is connected to an external power source through the wiring terminal 106. The control board 102 is connected to the stator 206 through the rear end surface of the casing 200 through inner leads.

Wherein, the connecting terminal 106 is a DC power connecting terminal 106, and the connecting terminal 106 is fixed on the upper part of the control housing 100. After the control board 102 is installed, a part of the edge of the control board 102 is clamped between the terminal 106 and the rear surface of the casing 200. The control board 102 is connected to an external power source through the terminal 106 and connected to the stator 206 through an inner lead. In this way, the lead is convenient, and at the same time, the control board 102 can be fixed.

In order to facilitate the installation and fixation of the control board 102, and also for the convenience of setting the outer and inner leads of the control board 102, the rear end surface of the casing 200, and/or the control board 102, and/or the control housing 100 are provided There is a positioning structure, so that the control board 102 can be conveniently positioned and installed.

As a specific embodiment, the positioning structure includes a first protrusion 201, which is located in the middle of the rear end surface of the casing 200 and protrudes toward the control board 102 in the axial direction; A through hole 107 matched with the first convex portion 201 is provided in the middle of the board 102, and the control board 102 is sleeved on the first convex portion 201 through the through hole 107.

The first protrusion 201 may be formed by protruding from the middle of the rear end surface of the casing 200, or may be a separately provided protrusion. The shape of the first convex portion 201 is matched with the through hole 107 on the control board 102, and it can be circular, polygonal, or irregular, preferably circular or polygonal. When the first convex portion 201 is circular, when installing, first put the control board 102 on the first convex portion 201 through the through hole 107 to achieve positioning, and then slightly rotate the control board 102 to adjust the position, align the position of the lead and fix it The location is sufficient and the installation is convenient. Or when the first convex part 201 is polygonal, the control board 102 is sleeved on the first convex part 201 through the through hole 107 to realize the alignment of various positions and improve the installation efficiency.

In a preferred solution, the first protrusion 201 is formed by protruding from the center of the rear end surface of the casing 200 toward the side of the control board 102, and the inside of the first protrusion 201 forms a cavity in which the end of the motor shaft 208 is arranged. In this way, the first protrusion 201 can play a role in positioning the control board 102, and can also play a role in mounting the motor shaft 208, reducing the number of components, saving space in the water pump and saving costs.

In addition, after the control housing 100 and the casing 200 are installed, in order to reduce the vibration of the control housing 100 when the water pump is working, an abutment structure 104 is provided on the inner wall of the control housing 100, and the abutment structure 104 is located in the control housing 100 opposite to the opening. The middle part of the inner wall of the control housing 100 protrudes toward the housing 200 relative to the inner wall of the control housing 100; after the control housing 100 is connected to the housing 200, the abutting structure 104 abuts on the first protrusion 201.

An abutment structure 104 is provided in the center of the inner wall of the control housing 100 opposite to the rear surface of the housing 200. After the control housing 100 is connected to the housing 200, the abutment structure 104 abuts on the first protrusion 201. Based on the reaction force, the first A convex portion 201 and abutting structure 104 also give support to the control housing 100. In this way, the strength of the rear end surface of the control housing 100 can be increased, and the rear end side wall of the control housing 100 can be fixed, so as to avoid large vibrations during the operation of the water pump.

Considering the heat dissipation effect of the control board 102, further, a second convex portion 202 is further provided on the rear end surface of the casing 200. The second convex portion 202 is located on the periphery of the first convex portion and is connected to the first convex portion. A protrusion 201 is arranged concentrically; the protrusion height of the second protrusion 202 is smaller than the protrusion height of the first protrusion 201. After the control board 102 is sleeved on the first protrusion 201, part of the surface of the control board 102 is attached to the surface of the second protrusion 202, and there is a certain gap between the part of the surface and the rear end surface of the casing 200. In this way, The heat dissipation effect of the control board 102 is ensured, and the control board 102 can be fully fixed, thereby reducing vibration and prolonging the service life of the control board 102.

In order to fix the control board 102 at the rear end of the casing 200, further, a fixing boss 203 is provided on the rear end of the casing 200, and a fixing hole 204 is provided on the fixing boss 203. The control The board 102 is provided with a connecting hole 108 through which the fixing member 109 passes. After the control board 102 is positioned, the fixing member 109 passes through the connecting hole 108 and is fixed to the fixing hole 204. The fixed boss 203 is located on the periphery of the second convex part 202. Preferably, the fixed boss 203 is arranged close to the edge of the rear end surface of the casing 200, so as to avoid the functional units on the control board 102 and facilitate installation.

In this solution, the protrusion height of the fixed boss 203 is the same as the protrusion height of the second protrusion 202, and the connecting hole 108 on the control board 102 is located near its edge. In this way, after the control board 102 is sleeved on the first protrusion 201, part of the surface of the control board 102 is attached to the surface of the second protrusion 202, and there is a certain gap between the part of the surface and the rear surface of the casing 200, and the control The connecting hole 108 of the board 102 is exactly aligned with the fixing hole 204 of the fixing boss 203, and the fixing member 109, such as a screw, passes through the connecting hole 108 and the fixing hole 204 in order to fix the control board 102 on the rear surface of the casing 200.

In order to further enhance the fixing effect, reduce the noise during the operation of the water pump, and reduce the vibration of the control board 102, a limit structure is also provided on the inner peripheral side wall of the control housing 100. The edge of the control board 102 and the limit structure In cooperation, the limit structure restricts the movement of the control board 102 in the axial direction.

As a specific embodiment, the limiting structure is a limiting platform 105, and the limiting platform 105 is formed by recessing the inner peripheral side wall of the control housing 100 close to the opening in the direction away from the center, and the control board 102 The edge of the abutting against the surface of the limit platform 105.

The limit platform 105 is located at one end of the control housing 100 close to the opening, and is partially recessed away from the center in the axial direction to form a stepped structure. The control board 102 is fixed on the rear surface of the housing 200, and the control housing 100 controls the control board. After 102 is covered in the control chamber 101, the edge of the control board 102 abuts against the surface of the limit table 105 to restrict the front and back movement of the console, and further enhance the fixing effect.

Further, the inner diameter of the opening of the control housing 100 is greater than the outer diameter of the rear end surface of the housing 200, and the inner circumference of the opening of the control housing 100 covers the outer circumference of the rear end of the housing 200, so that the entire control board 102 can be covered In the control chamber 101, the control part and the motor part are formed into an integral structure.

In order to realize the connection between the control housing 100 and the housing 200 of the motor part, further, the outer peripheral wall of the control housing 100 and the housing 200 are provided with a mutually cooperating connection structure to facilitate installation and removal.

As a specific embodiment, the connecting structure includes a clamping block 110 arranged on the outer periphery of the control housing 100 and a clamping hole 205 arranged on the outer periphery of the casing 200. One side of the clamping block 110 is connected to the control housing 100. The outer peripheral surface is fixed, and the other side extends horizontally in the direction of the housing 200. The extension end of the clamping block 110 is provided with a protruding structure; after the control housing 100 is connected to the housing 200, the protruding structure is inserted into the clamping hole 205 . In this way, through the clamping block 110 and the clamping hole 205, the control housing 100 and the casing 200 can be quickly fixedly connected and disassembled, which is convenient for manual disassembly and assembly.

Example two

This embodiment is a further limitation of the first embodiment. As shown in Figures 4 and 5, the pump part includes a pump housing 300. The pump housing 300 has a fixed structure 301, a water inlet 302, and a water outlet 303. The pump housing 300 is provided with There is an impeller 304 which is fixed at the front end of the motor shaft 208. The pump housing 300 is fixed at the front end of the housing 200 of the motor part, and a sealing ring of the pump housing 300 is arranged at the connection between the housing 200 and the pump housing 300 to prevent the liquid of the pump part from entering the motor part.

In addition, the front side of the front bearing 209 of the motor shaft 208 is also provided with a shaft sealing structure. The shaft sealing structure is sleeved on the motor shaft 208 to seal the front end of the motor part to prevent liquid from leaking into the motor along the motor shaft 208 Ministry.

Specifically, the shaft sealing structure is a shaft sealing ring 211 fixed inside the front end of the casing 200. The shaft sealing ring 211 includes an outer sealing portion 212 and an inner sealing portion 213, and the outer sealing portion 212 includes a sealing surface configured to cooperate with the front end of the casing 200.

The inner sealing portion 213 includes a plurality of sealing contact portions, each of which is in contact with the motor shaft 208, and adjacent sealing contact portions are arranged at a certain angle.

As a specific embodiment, the shaft seal ring 211 includes at least a first seal contact portion 214 and a second seal contact portion 215. The first seal contact portion 214 and the second seal contact portion 215 are arranged at an angle. An annular cavity 216 is formed therebetween. Both the first seal contact portion 214 and the second seal contact portion 215 contact the outer peripheral surface of the motor shaft 208 to perform sealing. A lubricating medium can be arranged in the annular cavity 216 to reduce the wear of the contact part and improve the sealing effect.

Example three

This embodiment is a further limitation of Embodiment 1 or Embodiment 2. As shown in FIG. 7, this embodiment provides a method for controlling a washing machine water pump. The water pump includes a control board, and the control board includes a detection unit, a drive unit, and a control unit. Unit, the control method includes:

When the washing machine water pump is working, the control unit judges whether air has entered the water pump according to the current value detected by the detection unit, and if it is judged that air has entered, it controls the driving unit to reduce the running speed of the water pump.

The washing machine water pump is installed in the drainage system of the washing machine. When the amount of water in the washing machine pump is very small, or the water flow contains too much detergent foam, etc., and a lot of air enters, a lot of noise will be generated. The washing machine water pump of this embodiment adopts the water pump of the first embodiment. The water pump is equipped with a control panel. The control panel integrates a detection drive control function. The detected current value can determine whether air enters the water pump, thereby adjusting the running speed of the water pump , This can greatly reduce the noise of the water pump and ensure the normal operation of the water pump.

The detection unit, drive unit and control unit are integrated on the control board. The detection unit detects the actual current value and transmits the signal to the control unit. The control unit receives the signal and compares it with the pre-stored current critical value. Therefore, the water pump of this embodiment can be easily installed on different washing machines, has good compatibility, and can also prevent air from entering the pump and generating loud noise.

More specifically, the detection unit detects the actual current value of the water pump, and the control unit compares the actual current value with the current critical value corresponding to the operating speed. If the actual current value is less than the current critical value, the control unit controls the drive unit to reduce the operating speed To the preset speed.

The washing machine water pump is a DC brushless water pump. The current of the DC brushless water pump matches the speed and flow rate. For example, the current value of the water pump is 1.8A, the corresponding speed is 4100 rpm, and the flow rate is 45L. When the water pump is in the airless state, the speed and the current value show a linear proportional relationship, the greater the speed, the greater the current value. In the airless state, when the pump runs at a certain speed, the current value is also a certain value.

In order to determine whether air has entered the water pump by detecting the actual current value, the control unit needs to compare the actual current value with a preset current value, and the preset current value may be a critical current value. The critical current value is set in the following way:

When the pump is running at the operating speed N, and in the airless state, the set current value corresponding to the operating speed N is I, and the current critical value corresponding to the operating speed N is I*β, where β is less than 1, which is The maximum allowable reduction factor.

When the pump is running at speed N, if there is no air in the pump, the theoretically detected actual current value should be the set current value I, and when part of the air enters the water pump, the actual detected current will be less than I , The more air enters, the smaller the actual current value detected. However, when only a small amount of air enters, it has little effect on the noise generation, so no adjustment is required. When the current drops below a certain level, it is easy to produce larger noise, so a maximum allowable reduction factor is established. The current critical value is I*β. The control unit compares the detected actual current value with the current critical value, so as to avoid the situation that the water pump adjusts the speed too frequently, and it can also avoid the situation of generating large noise.

As a specific implementation, the allowable maximum reduction coefficient β may range from 0.5 to 0.9.

The control method for the control unit of the water pump to judge according to the actual current value specifically includes:

Case 1: When the control unit analyzes that the actual current value I1 is less than I*β, it judges that the amount of water in the water pump is too little and the air is too much, and then the drive unit is controlled to reduce the speed to the preset speed, which can avoid generating large noise.

In case 2, when the control unit analyzes that the actual current value I1 is equal to I, or is less than I and not less than I*β, it keeps the operating speed N and continues to run. In this way, it is possible to avoid the situation that the water pump adjusts the rotation speed too frequently, and at the same time, it can also avoid the situation of generating large noise.

In this embodiment, reducing the operating speed to the preset speed includes: reducing the operating speed N to the preset speed M, where the preset speed M is the set speed value in the airless state corresponding to the actual current value I1.

When the washing machine water pump judges that there is too much air in the water pump and needs to reduce the rotation speed, it reduces the rotation speed to a specific value. The specific value is a set rotation speed value corresponding to the actual current value I1 according to the linear relationship between the current and the rotation speed. After the control unit of the control board controls the drive unit to reduce the rotation speed to the set rotation speed value, it continues to detect the actual current value in real time to avoid excessive air and excessively fast rotation speed to produce loud noise.

Further, in order to clarify the relationship between the preset speed and the actual current value more clearly, the ratio of the preset current value I to the operating speed N is a, and the ratio of the actual current value I1 to the preset speed M is b, where a Equal to b. Therefore, the speed of the water pump after reducing the speed is the set speed value corresponding to the actual current value in order to achieve the best drainage effect.

Example four

This embodiment is a further limitation of Embodiment 1 to Embodiment 3. This embodiment provides a washing machine having the washing machine water pump as described in any one of the solutions or the combination in the first embodiment, and the washing machine water pump is installed in On the drain pipeline of the washing machine, the control board of the washing machine water pump is connected with the main control unit of the washing machine through a line.

In this way, the washing machine water pump adopts a DC brushless motor and has an independent control part. The control part, the motor part and the pump part are integrated into a whole, so the water pump can be installed on different types of washing machines as a separately controllable whole, with good compatibility , And the overall volume is small, the application range is wide, the noise is small, and the efficiency is high.

The above are only the preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed as above in preferred embodiments, it is not intended to limit the present invention. Any technology familiar with this patent Without departing from the scope of the technical solution of the present invention, the personnel can use the technical content suggested above to make slight changes or modification into equivalent embodiments with equivalent changes, but any content that does not depart from the technical solution of the present invention is based on the technology of the present invention Essentially, any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the present invention.

Claims

A washing machine water pump, which is characterized by comprising a control part, a motor part and a pump part, the control part and the pump part are respectively fixed at two ends of the motor part, the control part has a control chamber, and a control board is fixedly arranged in the control chamber, The control part is detachably connected with the motor part, and the control board is enclosed in the control chamber.
The washing machine water pump according to claim 1, wherein the motor part comprises a casing, and the control board is fixed at the rear end of the casing; the control part comprises a control casing, and the control casing is formed with an orientation A control chamber with a side opening, the opening is matched with the rear surface of the casing; the control casing is detachably connected with the casing.
The washing machine water pump according to claim 2, wherein a positioning structure is provided on the rear end surface of the cabinet, and/or the control board, and/or the control housing;

Preferably, the positioning structure includes a first convex portion, the first convex portion is located in the middle of the rear end of the casing and protrudes toward the control board in the axial direction; the middle of the control board is provided with the first convex The through hole matched with the part, the control board is sleeved on the first convex part through the through hole;

Preferably, the first protrusion is formed by protruding from the center of the rear end surface of the casing toward the side of the control board, and the inside of the first protrusion forms a cavity in which the end of the motor shaft is arranged.
The washing machine water pump according to claim 3, wherein an abutting structure is provided on the inner wall of the control housing, and the abutting structure is located in the middle of the inner wall of the control housing opposite to the opening, and is opposite to the inner wall of the control housing. It protrudes toward the side of the casing; after the control casing is connected to the casing, the abutting structure abuts on the first convex portion.
A washing machine water pump according to any one of claims 2-4, wherein a second convex portion is further provided on the rear end surface of the casing, and the second convex portion is located on the upper side of the first convex portion. The outer periphery is arranged concentrically with the first protrusion; the protrusion height of the second protrusion is smaller than the protrusion height of the first protrusion;

Preferably, after the control board is sleeved on the first convex portion, part of the surface of the control board is attached to the surface of the second convex portion.
A washing machine water pump according to any one of claims 2-5, wherein a fixed boss is provided on the rear surface of the cabinet, and a fixed hole is provided on the fixed boss, and the The control board is provided with a connection hole for the fixing part to pass through. After the control board is positioned, the fixing part passes through the connection hole and is fixed to the fixing hole;

Preferably, the fixed boss is located on the periphery of the second convex part; more preferably, the fixed boss is arranged close to the edge of the rear end surface of the casing.
The washing machine water pump according to any one of claims 2-6, wherein a limit structure is provided on the inner peripheral side wall of the control housing, and the edge of the control board is matched with the limit structure to limit The position structure restricts the movement of the control board in the axial direction;

Preferably, the limiting structure is a limiting platform formed by recessing the inner peripheral side wall of the end of the control housing close to the opening in a direction away from the center, and the edge of the control board abuts against the surface of the limiting platform;

Preferably, the inner diameter of the opening of the control housing is larger than the outer diameter of the rear end surface of the housing, and the inner circumference of the opening of the control housing covers the outer circumference of the rear end of the housing.
The washing machine water pump according to any one of claims 2-7, wherein the outer peripheral wall of the control housing and the casing is provided with a mutually matched connection structure;

Preferably, the connecting structure includes a clamping block arranged on the outer periphery of the control housing and a clamping hole arranged on the outer periphery of the housing. One side of the clamping block is fixed to the outer peripheral surface of the control housing, and the other side faces the outer periphery of the housing. The direction extends horizontally, and the extension end of the clamping block is provided with a protruding structure; after the control housing is connected to the casing, the protruding structure is inserted into the clamping hole.
The washing machine water pump according to any one of claims 2-8, wherein the control housing is provided with a lead-out interface, and a wiring terminal is installed in the lead-out interface, and the control board is connected through the wiring The terminal is connected with the external power supply;

Preferably, a stator and a rotor are arranged in the casing, and the control board is connected to the stator through inner leads.
A washing machine, characterized in that the washing machine has the washing machine water pump according to any one of claims 1-10, and the washing machine water pump is connected to the main control unit of the washing machine.
A method for controlling a washing machine water pump is characterized in that the water pump includes a control board, the control board includes a detection unit, a driving unit and a control unit, and the control method includes:

When the washing machine water pump is working, the control unit judges whether air has entered the water pump according to the current value detected by the detection unit, and if it determines that air has entered, it controls the driving unit to reduce the running speed of the water pump.
The method for controlling a washing machine water pump according to claim 11, wherein the detection unit detects the actual current value of the water pump, and the control unit compares the actual current value with the current critical value corresponding to the operating speed, if the actual current value If the current is less than the critical value, the control unit controls the drive unit to reduce the running speed to the preset speed.
The method for controlling a washing machine water pump according to claim 12, wherein when the water pump is operating at an operating speed N, the set current value of the airless state corresponding to the operating speed N is equal to I The corresponding current critical value is I*β, where β is less than 1, which is the maximum allowable reduction factor;

Preferably, the range of the maximum allowable reduction coefficient β is 0.5-0.9.
The method for controlling a washing machine water pump according to claim 13, wherein when the control unit analyzes that the actual current value I1 is less than I*β, it is judged that the amount of water in the water pump is too little and the air is too much, and the control driving unit is reduced Speed to preset speed.
The method for controlling a washing machine water pump according to claim 13 or 14, characterized in that, when the control unit analyzes that the actual current value I1 is equal to I, or less than I and not less than I*β, the running speed N is maintained to continue running .
The method for controlling a washing machine water pump according to any one of claims 13-15, wherein reducing the running speed to a preset speed comprises: reducing the running speed N to a preset speed M, wherein the preset speed M is the set speed value in the airless state corresponding to the actual current value I1.
The method for controlling a washing machine water pump according to claim 16, wherein the ratio of the set current value I to the operating speed N is a, and the ratio of the actual current value I1 to the preset speed M is b , Where a is equal to b.
The method for controlling a washing machine water pump according to any one of claims 11-17, wherein the detection unit, the drive unit and the control unit are integrated on the control board, and the detection unit detects the actual current value and sends the signal Passed to the control unit, the control unit receives the signal and compares it with the pre-stored current critical value.