CN111828277A

CN111828277A - Washing machine water pump and washing machine

Info

Publication number: CN111828277A
Application number: CN201910309189.5A
Authority: CN
Inventors: 赵志强; 许升; 杨旭光
Original assignee: Qingdao Haier Washing Machine Co Ltd; Qingdao Haier Co Ltd
Current assignee: Chongqing Haier Washing Machine Co Ltd; Haier Smart Home Co Ltd
Priority date: 2019-04-17
Filing date: 2019-04-17
Publication date: 2020-10-27
Anticipated expiration: 2039-04-17
Also published as: CN111828277B

Abstract

The invention discloses a washing machine water pump and a washing machine. The invention relates to a washing machine water pump, which comprises a control part, a motor part and a pump part, wherein the control part and the pump part are respectively fixed at two ends of the motor part, a control cavity is arranged in the control part, a control panel is fixedly arranged in the control cavity, the control part is detachably connected with the motor part, and the control panel is sealed in the control cavity. The washing machine water pump adopts the direct-current brushless motor and is provided with the independent control part, and the control part, the motor part and the pump part are integrated into a whole, so that the water pump can be installed on washing machines of different models as a single-controlled whole, and the washing machine water pump has the advantages of good compatibility, small whole volume, wide application range, low noise and high efficiency.

Description

Washing machine water pump and washing machine

Technical Field

The invention belongs to the field of washing machines, particularly relates to a washing machine water pump and a washing machine, and more particularly relates to a direct-current brushless water pump.

Background

The washing machine is designed as a device for washing laundry by using electricity, and generally, the washing machine includes: a tub for holding washing water; a washing tub rotatably installed inside the tub; a pulsator rotatably installed at the bottom of the washing tub; a motor and a clutch configured to rotate the washing tub and the pulsator. When the pulsator rotates to agitate the laundry and the washing water in the washing tub, thereby removing stains from the laundry. The washing machine further includes a drainage system in which a drainage pump is used to drain the washed water from the washing machine through a drainage pipe.

The drainage system of the washing machine at present mostly adopts an alternating current motor water pump, the working noise generated in the drainage process is larger, the flow is smaller, the efficiency is lower, and the experience comfort level of a user in the washing process is influenced. In order to improve this situation, some washing machines employ a dc brushless water pump, and a driving unit is provided in a main control panel of the washing machine to adjust an operating state of the dc brushless water pump. However, the control and driving of the water pump are integrated with the control panel of the washing machine, and when the water pump is applied to other washing machines, the control panel of the washing machine needs to be replaced together with the control panel of the washing machine, which possibly causes the incompatibility of the control panel and influences the application range of the water pump.

The present invention has been made in view of this situation.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a water pump of a washing machine and the washing machine. The washing machine water pump adopts the direct current brushless motor and is provided with the independent control part, so that the water pump is used as a whole which can be independently controlled to be arranged on different washing machines, and the washing machine water pump has the advantages of good compatibility, wide application range, low noise and high efficiency.

In order to solve the technical problems, the invention adopts the technical scheme that:

the invention provides a water pump of a washing machine, which comprises a control part, a motor part and a pump part, wherein the control part and the pump part are respectively fixed at two ends of the motor part, a control cavity is arranged in the control part, a control plate is fixedly arranged in the control cavity, the control part is detachably connected with the motor part, and the control plate is sealed in the control cavity.

In a further scheme, the motor part comprises a shell, and the control panel is fixed at the rear end of the shell; the control part comprises a control shell, a control chamber with an opening facing one side is formed in the control shell, and the opening is matched with the rear end face of the shell; the control shell is detachably connected with the machine shell.

In a further scheme, a positioning structure is arranged on the rear end face of the machine shell, and/or on the control panel, and/or on the control shell;

preferably, the positioning structure comprises a first convex part which is positioned in the middle of the rear end face of the casing and protrudes towards one side of the control plate in the axial direction; the middle part of the control plate is provided with a through hole matched with the first convex part, and the control plate 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 housing toward one side of the control plate, and a cavity for accommodating the end of the motor shaft is formed inside the first protrusion.

In a further scheme, a propping structure is arranged on the inner wall of the control shell, the propping structure is positioned in the middle of the inner wall of the control shell opposite to the opening, and the inner wall opposite to the control shell protrudes towards one side of the machine shell; after the control shell is connected with the machine shell, the abutting structure abuts against the first convex part.

In a further scheme, a second convex part is also arranged on the rear end face of the shell, is positioned on the periphery of the first convex part and is concentric with the first convex part; the protruding height of the second convex part is smaller than that of the first convex part;

preferably, after the control plate is sleeved on the first convex part, part of the surface of the control plate is attached to the surface of the second convex part.

In a further scheme, a fixing boss is arranged on the rear end face of the casing, a fixing hole is formed in the fixing boss, a connecting hole for the fixing piece to penetrate through is formed in the control panel, and after the control panel is positioned, the fixing piece penetrates through the connecting hole and is fixed with the fixing hole;

preferably, the fixing boss is positioned at the periphery of the second convex part; more preferably, the fixing boss is arranged close to the edge of the rear end face of the casing.

In a further scheme, a limiting structure is further arranged on the inner peripheral side wall of the control shell, the edge of the control plate is matched with the limiting structure, and the limiting structure limits the control plate to move in the axial direction;

preferably, the limiting structure is a limiting table and is formed by sinking the inner peripheral side wall of the control shell close to one end of the opening in the direction away from the center, and the edge of the control plate abuts against the surface of the limiting table;

preferably, the inner diameter of the opening of the control housing is larger than the outer diameter of the rear end face of the casing, and the inner circumference of the opening of the control housing covers the outer circumference of the rear end of the casing.

In a further scheme, the peripheral walls of the control shell and the casing are provided with mutually matched connecting structures;

preferably, the connecting structure comprises a clamping block arranged on the periphery of the control shell and a clamping hole arranged on the periphery of the shell, one side of the clamping block is fixed with the peripheral surface of the control shell, the other side of the clamping block horizontally extends towards the direction of the shell, and a protruding structure is arranged at the extending end of the clamping block; after the control shell is connected with the machine shell, the protruding structure is inserted into the clamping hole.

In a further scheme, an outgoing line interface is arranged on the control shell, a wiring terminal is installed in the outgoing line interface, and the control panel is connected with an external power supply through the wiring terminal;

preferably, a stator and a rotor are arranged in the casing, and the control board is connected with the stator through an inner lead.

The second purpose of the invention is to provide a washing machine, which is provided with the washing machine water pump according to any one or combination of the above schemes, and the washing machine water pump is connected with a main control unit of the washing machine.

After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:

1. the washing machine water pump adopts the direct-current brushless motor, the motor is provided with the independent control part, and the control part, the motor part and the pump part are integrated into a whole, so that the water pump can be installed on washing machines of different models as a single-controlled whole, and the washing machine water pump has the advantages of good compatibility, small whole volume, wide application range, low noise and high efficiency.

2. The control part of the washing machine water pump is detachably connected with the motor part, the control panel is fixed in the control cavity through various positioning structures, fixing structures and limiting structures, the fixing effect is good, and other fixing media such as glue filling are not needed for fixing, so that the cost can be saved, the assembly and disassembly are convenient, and the control panel is convenient to maintain.

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a schematic view of the overall structure of a water pump of a washing machine according to the present invention;

FIG. 2 is a schematic view of the overall structure of the water pump of the washing machine according to another aspect of the present invention;

FIG. 3 is a top view of the washer pump of the present invention;

FIG. 4 is a cross-sectional view of a washer pump of the present invention;

FIG. 5 is an enlarged view of the sealing ring of the water pump shaft of the washing machine according to the present invention;

FIG. 6 is a side view of the washer pump of the present invention;

FIG. 7 is a graph of the relationship between the current and the rotation speed of the water pump of the washing machine according to the present invention;

in the figure: the device comprises a 100 control shell, a 101 control cavity, a 102 control panel, a 104 abutting structure, a 105 limit table, 106 wiring terminals, 107 through holes, 108 connecting holes, 109 fixing pieces, 110 clamping blocks and 111 outgoing line interfaces;

200, 201, a first convex part, 202, a second convex part, 203, 204, a fixing hole, 205, a clamping hole, 206, 207, a rotor, 208, a motor shaft, 209, a front bearing, 210, a rear bearing, 211, a shaft sealing ring, 212, an outer sealing part, 213, an inner sealing part, 214, a first sealing contact part, 215, a second sealing contact part and 216, wherein the concave cavity is formed by the first convex part, the second convex part, the 203, the fixing boss, the fixing hole, the fixing;

300 pump case, 301 fixed knot construct, 302 water inlet, 303 delivery port, 304 impeller, 305 pump case sealing washer.

It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended 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., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example one

As shown in fig. 1 to 6, the present embodiment provides a water pump for a washing machine, which includes a control part, a motor part, and a pump part, wherein the control part and the pump part are respectively fixed at two ends of the motor part, the control part has a control chamber 101 therein, a control board 102 is fixedly disposed in the control chamber 101, the control part is detachably connected with the motor part, and the control board 102 is sealed in the control chamber 101.

In this embodiment, the washing machine water pump is wholly divided into three parts, and the control part can realize independent detection and control, and motor part adopts the brushless direct current motor, has impeller 304 in the water pump portion, and impeller 304 rotates under the motor drive and carries liquid medium. So, control part, motor part and pump portion integration are a whole, therefore but the water pump is installed on the washing machine of different models as a single control's whole, and compatibility is good, and whole small, and the range of application is wide, small in noise, efficient.

The control part and the pump part are respectively fixed at two ends of the motor part, and the specific positions can be the control part, the motor part and the pump part from left to right as shown in the figure, and also can be arranged in other directions, such as up and down. So, control unit keeps away from pump portion, can avoid the liquid medium of transmission in the pump portion to reveal and influence control unit, guarantees the safe operation of water pump.

The control panel 102 comprises a control unit, a detection unit and a driving unit which are integrated, and integrates detection and control functions, so that the water pump can be conveniently installed on washing machines of different models as a whole which can be controlled independently, and the compatibility of the water pump is greatly improved. The control part is detachably connected with the motor part, the control panel 102 is sealed in the control chamber 101, the installation mode is convenient for installing the control panel 102 and disassembling and maintaining the control panel 102, and labor and cost are saved.

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 comprises a control shell 100, a control chamber 101 with an opening facing one side is formed in the control shell 100, and the opening is matched with the rear end face of the machine shell 200; the control housing 100 is detachably connected to the casing 200.

Each part of the motor is arranged in the casing 200 of the motor part, which specifically comprises: a stator 206, a rotor 207, and a motor shaft 208, the stator 206 being fixed in the casing 200 and wound with a coil; the rotor 207 is positioned in a rotor 207 cavity formed between the two stators 206 and is capable of rotating relative to the stators 206, the motor shaft 208 is mounted at the middle of the housing 200 through a bearing, and the outer circumference of the motor shaft 208 is fixedly connected with 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, and the reliability in high-speed operation can be improved. 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 to extend into the pump casing 300 of the pump part and is fixedly connected with the impeller 304 in the pump part. Thus, when the rotor 207 rotates the motor shaft 208, the motor shaft 208 rotates the impeller 304.

In the scheme, the control panel 102 is fixed at the rear end of the casing 200 of the motor part, then the control housing 100 of the control part covers the control panel 102, and the control housing 100 is detachably fixed at the rear end of the casing 200, so that the control panel 102 is protected and further fixed. The opening of the control chamber 101 formed in the control housing 100 is toward the rear end of the casing 200, and may be the same size as the rear end surface or slightly larger than the periphery of the rear end surface, so as to enclose the control board 102. Thus, after the control panel 102 is fixed and the control housing 100 is connected to the casing 200, the control part and the motor part are integrated, which is beneficial to the overall operation of the water pump.

Further, the control housing 100 is provided with an outlet port 111, a connection terminal 106 is installed in the outlet port 111, and the control board 102 is connected to an external power source through the connection terminal 106. The control board 102 is connected to the stator 206 by internal leads through the rear face of the casing 200.

The connection terminal 106 is a dc power connection terminal 106, and the connection terminal 106 is fixed on the upper portion of the control housing 100. When the control board 102 is mounted, a part of the edge of the control board 102 is held between the connection terminal 106 and the rear end surface of the housing 200, and the control board 102 is connected to an external power source through the connection terminal 106 and is connected to the stator 206 through an inner lead. In this manner, the lead is convenient, and the control board 102 can be fixed.

For conveniently installing and fixing the control board 102 and for conveniently arranging the external lead and the internal lead of the control board 102, a positioning structure is provided on the rear end face of the casing 200, and/or on the control board 102, and/or on the control housing 100, so as to conveniently position and install the control board 102.

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

The first protrusion 201 may be formed to protrude from the middle of the rear end surface of the housing 200, or may be a separately provided protrusion. The first protrusion 201 is shaped to fit the through hole 107 of the control plate 102, and may be circular, polygonal, or irregular, preferably circular or polygonal. When the first convex part 201 is circular, the control board 102 is sleeved on the first convex part 201 through the through hole 107 to realize positioning during installation, and then the control board 102 is slightly rotated to adjust the position so as to align the position and the fixed position of the lead, so that the installation is convenient. Or when the first convex part 201 is polygonal, the control plate 102 is sleeved on the first convex part 201 through the through hole 107, so that alignment of each position can be realized, and the installation efficiency is improved.

Preferably, the first protrusion 201 is formed by protruding from the center of the rear end surface of the housing 200 toward the control plate 102, and the inside of the first protrusion 201 forms a cavity for accommodating the end of the motor shaft 208. Thus, the first convex part 201 can play a role in positioning the control panel 102 and can also play a role in mounting the motor shaft 208, so that the number of the arranged parts is reduced, the space in the water pump can be saved, and the cost is saved.

In addition, after the control casing 100 is installed on the machine shell 200, in order to reduce the vibration of the control casing 100 when the water pump works, an abutting structure 104 is arranged on the inner wall of the control casing 100, the abutting structure 104 is positioned in the middle of the inner wall of the control casing 100 opposite to the opening, and the inner wall of the control casing 100 opposite to the opening protrudes towards one side of the machine shell 200; after the control housing 100 is connected to the chassis 200, the abutting structure 104 abuts on the first protrusion 201.

The center of the inner wall of the control housing 100 opposite to the rear end face of the casing 200 is provided with an abutting structure 104, after the control housing 100 is connected with the casing 200, the abutting structure 104 abuts on the first protrusion 201, and based on the reaction force, the first protrusion 201 and the abutting structure 104 can also give a supporting force to the control housing 100. Therefore, the strength of the rear end face of the control shell 100 can be increased, the side wall of the rear end of the control shell 100 can be fixed, and large vibration generated during the operation of the water pump is avoided.

In consideration of the heat dissipation effect on the control board 102, further, a second protrusion 202 is further disposed on the rear end surface of the chassis 200, and the second protrusion 202 is located at the periphery of the first protrusion and is concentric with the first protrusion 201; the second protrusion 202 protrudes to a height smaller than the protrusion height of the first protrusion 201. After the control panel 102 is sleeved on the first protrusion 201, part of the surface of the control panel 102 is attached to the surface of the second protrusion 202, and a certain gap is formed between the part of the surface and the rear end face of the casing 200, so that the heat dissipation effect of the control panel 102 can be ensured, the control panel 102 can be sufficiently fixed, the vibration is reduced, and the service life of the control panel 102 is prolonged.

In order to fix the control board 102 at the rear end of the chassis 200, further, a fixing boss 203 is disposed on the rear end face of the chassis 200, a fixing hole 204 is disposed on the fixing boss 203, a connecting hole 108 for the fixing member 109 to pass through is disposed on the control board 102, and after the control board 102 is positioned, the fixing member 109 passes through the connecting hole 108 and is fixed with the fixing hole 204. The fixing boss 203 is located at the periphery of the second protrusion 202, and preferably, the fixing boss 203 is disposed near the edge of the rear end face of the chassis 200, so as to avoid the functional unit on the control board 102 and facilitate installation.

In this embodiment, the height of the protrusion of the fixing boss 203 is the same as the height of the protrusion of the second protrusion 202, and the connection hole 108 of the control plate 102 is located near the edge thereof. Thus, after the control board 102 is sleeved on the first protrusion 201, a part of the surface of the control board 102 is attached to the surface of the second protrusion 202, a certain gap is formed between the part of the surface and the rear end face of the chassis 200, the connection hole 108 of the control board 102 is exactly aligned with the fixing hole 204 of the fixing boss 203, and the fixing member 109, such as a screw, sequentially penetrates through the connection hole 108 and the fixing hole 204 to fix the control board 102 on the rear end face of the chassis 200.

In order to further enhance the fixing effect, reduce the noise of the water pump during operation, and reduce the vibration of the control plate 102, the inner peripheral sidewall of the control housing 100 is further provided with a limiting structure, the edge of the control plate 102 is matched with the limiting structure, and the limiting structure limits the control plate 102 to move in the axial direction.

As a specific embodiment, the limiting structure is a limiting table 105, the limiting table 105 is formed by recessing an inner peripheral side wall of the control housing 100 near one end of the opening in a direction away from the center, and an edge of the control plate 102 abuts against a surface of the limiting table 105.

The limit table 105 is located at one end of the control housing 100 close to the opening, and is partially recessed in the axial direction in the direction away from the center, so that a stepped structure is formed, the control panel 102 is fixed on the rear end face of the machine shell 200, after the control housing 100 covers the control panel 102 in the control chamber 101, the edge of the control panel 102 abuts against the surface of the limit table 105, the front and back movement of the control table is limited, and the fixing effect is further enhanced.

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

In order to realize the connection between the control casing 100 and the casing 200 of the motor part, further, the peripheral walls of the control casing 100 and the casing 200 are provided with mutually matched connecting structures, so that the installation and the disassembly are convenient.

As a specific embodiment, the connecting structure includes a clamping block 110 disposed at the periphery of the control housing 100 and a clamping hole 205 disposed at the periphery of the casing 200, one side of the clamping block 110 is fixed to the peripheral surface of the control housing 100, the other side extends horizontally in the direction of the casing 200, and the extending end of the clamping block 110 is provided with a protruding structure; after the control housing 100 is connected to the casing 200, the protruding structure is inserted into the engaging hole 205. Thus, 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, and manual disassembly and assembly are facilitated.

Example two

The present embodiment is a further limitation of the first embodiment, as shown in fig. 4 and 5, the pump portion includes a pump casing 300, the pump casing 300 has a fixing structure 301, a water inlet 302 and a water outlet 303, an impeller 304 is disposed in the pump casing 300, and the impeller 304 is fixed at the front end of the motor shaft 208. The pump case 300 is fixed at the front end of the casing 200 of the motor part, and a sealing ring of the pump case 300 is arranged at the joint of the casing 200 and the pump case 300 to prevent the liquid in the pump part from entering the motor part.

In addition, a shaft sealing structure is arranged on the front side of a front bearing 209 of the motor shaft 208, and the shaft sealing structure is sleeved on the motor shaft 208 to seal the front end of the motor part and prevent liquid from permeating into the motor part along the motor shaft 208.

Specifically, the shaft seal structure is a shaft seal 211 fixed inside the front end of the casing 200. Shaft seal 211 includes an outer seal 212 and an inner seal 213, outer seal 212 including a sealing surface configured to mate with the front end structure of chassis 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 disposed at a certain angle.

In one embodiment, the shaft seal 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 being disposed at an angle to form an annular cavity 216 therebetween. The first seal contact portion 214 and the second seal contact portion 215 are both in contact with the outer peripheral surface of the motor shaft 208, and seal. And a lubricating medium can be arranged in the annular concave cavity 216, so that the abrasion of a contact part is reduced, and the sealing effect is improved.

EXAMPLE III

In this embodiment, which is a further limitation of the first embodiment or the second embodiment, as shown in fig. 7, a control method for a water pump of a washing machine is provided, in which 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 water pump of the washing machine works, the control unit judges whether air enters the water pump or not according to the current value detected by the detection unit, and if the air enters the water pump, the control unit controls the driving unit to reduce the running rotating speed of the water pump.

The washing machine water pump is installed in the drainage system of the washing machine, and when the water quantity in the washing machine water pump is small, or the water flow contains excessive detergent foam and the like and enters a large amount of air, great noise is generated. The washing machine water pump of this embodiment adopts the water pump of embodiment one, is equipped with the control panel on the water pump, and whether the control panel integration detects drive control function can judge the air that gets into in the water pump through the current value that detects to this adjusts the operation rotational speed of water pump, so can reduce the noise of water pump greatly, guarantees the normal operating of water pump.

The detection unit, the driving unit and the control unit are integrated on the control panel, the detection unit detects an actual current value and transmits a signal to the control unit, and the control unit receives the signal and then compares the signal with a pre-stored current critical value. Therefore, the water pump of this embodiment is convenient to be installed on different washing machines, and is compatible good, also can avoid the condition of getting into the air in the pump, production great noise.

More specifically, the detection unit detects an actual current value of the water pump, the control unit compares the actual current value with a current critical value corresponding to the operating rotating speed, and if the actual current value is smaller than the current critical value, the control unit controls the driving unit to reduce the operating rotating speed to a preset rotating speed.

The washing machine water pump is a direct current brushless water pump, the current of the direct current brushless water pump is matched with the rotating speed, the flow rate is matched, for example, the current value of the water pump is 1.8A, the corresponding rotating speed is 4100 revolutions, and the flow rate is 45L. When the water pump is in an airless state, the rotating speed and the current value are in a linear proportional relation, and the larger the rotating speed is, the larger the current value is. In the air-free state, the current value is a certain value when the water pump runs at a certain rotating speed.

In order to determine whether air is introduced into the water pump by detecting the actual current value, the control unit needs to compare the actual current value with a pre-stored current value, which may be a critical current value. The critical current value is set by:

when the water pump operates at the operating speed N and is in an air-free 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 beta, wherein beta is smaller than 1 and is an allowable maximum reduction coefficient.

When the water pump runs at the rotating speed N, if the water pump is in an air-free state, the actually detected current value should be the set current value I theoretically, and after partial air enters the water pump, the actually detected current value is smaller than I, and the more the air enters, the smaller the detected actual current value is. However, when only a small amount of air is introduced, the influence on the noise generation is not large, and therefore, adjustment is not required, and when the current is reduced to a certain level or less, a large noise is easily generated, so that an allowable maximum reduction coefficient is established, and the current threshold value is I × β. The control unit compares the detected actual current value with the current critical value to avoid the condition that the rotating speed of the water pump is adjusted too frequently, and simultaneously, the condition of generating larger noise can be avoided.

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

The control method for judging the control unit of the water pump according to the actual current value specifically comprises the following steps:

in case 1, when the control unit analyzes that the actual current value I1 is less than I × β, it is determined that the water amount in the water pump is too small and the air is too much, and the control unit controls the driving unit to reduce the rotation speed to the preset rotation speed, so that the generation of loud noise can be avoided.

In case 2, when the control unit analyses that the actual current value I1 is equal to I, or is less than I and not less than I x β, the operation is continued with the operating speed N. So, can avoid the too frequent condition of water pump adjustment rotational speed, also can avoid producing the condition of great noise simultaneously.

In this embodiment, reducing the operating rotational speed to the preset rotational speed includes: and reducing the running rotating speed N to a preset rotating speed M, wherein the preset rotating speed M is a set rotating speed value in an air-free state corresponding to the actual current value I1.

When the washing machine water pump judges that the air in the water pump is too much and the rotating speed needs to be reduced, the rotating speed is reduced to a specific value, and the specific value is a set rotating speed value corresponding to an actual current value I1 according to the linear relation between the current and the rotating speed. After the control unit of the control board controls the driving unit to reduce the rotating speed to the set rotating speed value, the actual current value is continuously detected in real time, and the conditions that air is too much and the rotating speed generates large noise at an over-high speed are avoided.

Further, in order to make the relationship between the preset rotation speed and the actual current value more clear, the ratio of the set current value I to the operating rotation speed N is a, and the ratio of the actual current value I1 to the preset rotation speed M is b, where a is equal to b. Therefore, the rotating speed of the water pump is reduced to a set rotating speed value corresponding to the actual current value, so that the best water drainage effect is achieved.

Example four

The present embodiment is further limited to the first embodiment to the third embodiment, and provides a washing machine having a washing machine water pump as described in any one or combination of the first embodiment, the washing machine water pump is installed on a drain pipeline of the washing machine, and a control panel of the washing machine water pump is connected to a main control unit of the washing machine through a pipeline.

So, washing machine water pump adopts direct current brushless motor, has independent control part, and control part, motor part and pump portion integration are a whole, therefore the water pump can install on the washing machine of different models as a whole that can independent control, and is compatible good, and whole small, and the range of application is wide, and is small in noise, efficient.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a washing machine water pump, its characterized in that includes control part, motor portion and pump portion, and control part and pump portion fix respectively at the both ends of motor portion, control chamber has in the control part, and the control panel is set up to the control chamber internal fixation, control part and motor portion detachable are connected, seal the control panel in control chamber.

2. The washing machine water pump as claimed in claim 1, wherein the motor part comprises a housing, the control panel is fixed at the rear end of the housing; the control part comprises a control shell, a control chamber with an opening facing one side is formed in the control shell, and the opening is matched with the rear end face of the shell; the control shell is detachably connected with the machine shell.

3. The washing machine water pump according to claim 2, characterized in that a positioning structure is arranged on the rear end face of the machine shell, and/or on the control panel, and/or on the control shell;

4. The washing machine water pump as claimed in claim 3, wherein the inner wall of the control casing is provided with an abutting structure, the abutting structure is located at the middle part of the inner wall of the control casing opposite to the opening, and the inner wall opposite to the control casing is protruded towards one side of the machine shell; after the control shell is connected with the machine shell, the abutting structure abuts against the first convex part.

5. The washing machine water pump according to any one of claims 2-4, characterized in that a second convex part is arranged on the rear end surface of the casing, the second convex part is positioned at the periphery of the first convex part and is concentric with the first convex part; the protruding height of the second convex part is smaller than that of the first convex part;

6. The washing machine water pump according to any one of claims 2-5, characterized in that a fixing boss is arranged on the rear end face of the casing, a fixing hole is arranged on the fixing boss, a connecting hole for the fixing member to pass through is arranged on the control panel, and after the control panel is positioned, the fixing member passes through the connecting hole and is fixed with the fixing hole;

7. The washing machine water pump according to any one of claims 2 to 6, characterized in that the control casing is further provided with a limiting structure on the inner peripheral side wall, the edge of the control plate is matched with the limiting structure, and the limiting structure limits the control plate to move in the axial direction;

8. A washing machine water pump according to any one of claims 2-7, characterized in that the control casing and the outer peripheral wall of the machine shell are provided with mutually matched connecting structures;

9. The washing machine water pump as claimed in any one of claims 2 to 8, wherein the control housing is provided with an outlet port, a connection terminal is installed in the outlet port, and the control panel is connected to an external power supply through the connection terminal;

10. A washing machine characterized in that it has a washing machine pump according to any of claims 1-10 connected to the main control unit of the washing machine.