WO2018014810A1 - 一种排水泵及使用该排水泵的洗衣机 - Google Patents

一种排水泵及使用该排水泵的洗衣机 Download PDF

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Publication number
WO2018014810A1
WO2018014810A1 PCT/CN2017/093171 CN2017093171W WO2018014810A1 WO 2018014810 A1 WO2018014810 A1 WO 2018014810A1 CN 2017093171 W CN2017093171 W CN 2017093171W WO 2018014810 A1 WO2018014810 A1 WO 2018014810A1
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WO
WIPO (PCT)
Prior art keywords
pump
bearing
shaft
cavity
motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/093171
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English (en)
French (fr)
Inventor
赵志强
许升
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Haier Washing Machine Co Ltd
Original Assignee
Qingdao Haier Washing Machine Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao Haier Washing Machine Co Ltd filed Critical Qingdao Haier Washing Machine Co Ltd
Priority to US16/318,165 priority Critical patent/US10837137B2/en
Priority to JP2019502065A priority patent/JP2019522754A/ja
Publication of WO2018014810A1 publication Critical patent/WO2018014810A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements
    • D06F39/085—Arrangements or adaptations of pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/0613—Special connection between the rotor compartments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/041—Axial thrust balancing
    • F04D29/0413—Axial thrust balancing hydrostatic; hydrodynamic thrust bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/086—Sealings especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/08—Insulating casings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/124—Sealing of shafts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
    • H02K5/1672—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003—Couplings; Details of shafts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H02K7/085—Structural association with bearings radially supporting the rotary shaft at only one end of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/44—Current or voltage
    • D06F2103/48—Current or voltage of the motor driving the pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps

Definitions

  • the invention belongs to the field of drainage pumps, and in particular to a drainage pump for a washing machine.
  • the washing machine uses the drainage pump as the active drainage device.
  • the drainage pump used in the washing machine is a permanent magnet drainage pump.
  • the permanent magnet type drain pump comprises a permanent magnet motor, and a pump body is fixed at one end of the permanent magnet motor adjacent to the output shaft, the pump body is tubular, and one end of the permanent magnet motor is sealedly connected with one end of the pump body and the output of the permanent magnet motor
  • the shaft extends into the pump body, and the pump shaft is fixed at the end of the output shaft of the permanent magnet motor.
  • the output pump of the pump body side of the drain pump is generally The sealing plate is provided with sealing gaskets.
  • the insulation plate In order to install such parts, the insulation plate needs to be designed to be a sinking hole on the pump body side. This design not only increases the parts of the drainage pump, but also increases the maintenance and repair of the drainage pump. Difficulty, and reduce the overall reliability of the pump wheel, there is also a space between the pump wheel and the isolation plate, which causes the pump wheel to have a pressure difference on both sides of the pump wheel during the rapid operation. The noise.
  • the present invention has been made in view of the above.
  • the technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and provide a drain pump and a washing machine using the same, the drain pump effectively reducing parts, high assembly efficiency, good sealing effect, and significantly reduced The noise when the drain pump is running.
  • a drain pump includes a pump wheel, a pump wheel shaft, a pump shaft, a permanent magnet, a bearing, a motor base, a pump casing, and a partition plate, wherein the motor base and the pump casing enclose a sealed cavity, and the partition plate
  • the sealing cavity is divided into two cavities, one side is a motor cavity and the other side is a pump wheel cavity; the pump wheel is located in the pump wheel cavity, and the isolation plate has a cylindrical structure on the motor cavity side to form a bearing seat a plane on the side of the pump wheel chamber; the bearing is fastened to the bearing housing, through the central hole of the bearing housing of the spacer, through the two chambers, the bearing is in the pump wheel chamber
  • the pump protrudes from the plane of the partition plate and closely fits with the pump wheel to form a second contact; the pump wheel is integrally molded with the pump wheel shaft, and the pump wheel shaft is tightly fixed to the bearing Inside, through the insulation plate into the motor cavity, and connected to the pump shaft in the motor cavity.
  • the pump wheel shaft is screwed to the pump shaft, and the screw fastening direction is consistent with the rotation direction of the pump wheel.
  • the pump wheel shaft has an annular groove in a circumferential direction, and a sealing ring is disposed in the groove to completely fill a gap between the inner wall of the bearing and the pump wheel shaft.
  • the pump shaft is integrally provided with the permanent magnet.
  • the bearing is in close contact with the permanent magnet or the protrusion integrally molded with the permanent magnet to form a first contact.
  • the pump casing and the motor base are tightly connected by bolts or screws, and the contact portion of the pump casing that is in planar contact with the partition plate is a limiting platform, the limiting platform is annular, and the radius is larger than the radius of the separating plate. .
  • the edge of the spacer at the circumference of the spacer is bent toward the motor cavity to form a first extrusion sealing structure of the spacer.
  • the motor seat and the partition plate have a second extrusion sealing structure in which the protruding portion forms a motor seat.
  • annular sealing ring is pressed against the first extrusion sealing structure and the second extrusion sealing structure.
  • washing machine having a drain pump of any of the features described above.
  • Figure 1 is a cross-sectional view showing the structure of a drain pump of the present invention
  • Figure 2 is a partially enlarged cross-sectional view showing the structure of the drain pump of the present invention
  • connection In the description of the present invention, it should be noted that the terms “installation”, “connected”, and “connected” are to be understood broadly, and may be fixed or detachable, for example, unless otherwise explicitly defined and defined. Connected, or integrally connected; can be mechanical or electrical; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.
  • the present invention discloses a drain pump and a washing machine having the same, the drain pump including a pump impeller 7, a pump impeller 20, a pump shaft 13, a permanent magnet 12, a bearing 16, and a motor base. 25.
  • the pump casing 2 and the partitioning plate 23 are characterized in that: the motor base 25 and the pump casing 2 enclose a sealed cavity, and the separating plate 23 divides the sealing cavity into two cavities, one side is a motor
  • the chamber 27 has the pump wheel chamber 28 on the other side, and the pump wheel 7 is located in the pump wheel chamber 28;
  • the partition plate 23 has a cylindrical structure on the side of the motor chamber 27 to form a bearing housing 17, at the pump
  • the side of the wheel chamber 28 is flat;
  • the bearing 16 is fastened to the bearing housing 17, through the central hole of the bearing housing 17 of the spacer 23, through the two chambers, the bearing 16 is at the pump wheel
  • the cavity 28 protrudes slightly from the plane of the partition plate 23 and is in close contact with the pump impeller 7 to form a second contact 26;
  • the pump impeller 7 is integrally molded with the pump impeller shaft 20, and the pump impeller shaft 20 is tightly fixed in the chamber Inside the bearing 16, it enters the motor cavity 27 through the spacer 23 and is
  • the drain pump of the present invention includes a pump impeller 7, a pump impeller shaft 20, a pump shaft 13, a permanent magnet 12, a bearing 16, a motor base 25, a pump casing 2, and a partition plate 23,
  • the motor base 25 and the pump casing 2 enclose a sealed cavity, and the partition plate 23 divides the sealed cavity into two cavities, one side is a motor cavity 27, and the other side is a pump wheel cavity 28;
  • the pump wheel 7 is located in the pump wheel chamber 28,
  • the partition plate 23 has a cylindrical structure on the side of the motor cavity 27 to form a bearing seat 17, which is flat on the side of the pump wheel chamber 28;
  • the wheel 7 fits snugly, A second contact 26 is formed;
  • the pump impeller 7 is integrally injection molded with the pump impeller shaft 20, the pump impeller shaft 20 is tightly
  • the connection between the pump shaft and the pump wheel is on the pump chamber side, that is, in a liquid environment.
  • a copper insert is usually attached to the end of the pump shaft.
  • the insert is tightly inserted into the pump wheel and connected to the pump wheel.
  • the insert also needs to be provided with a seal ring structure, and at the same time, in order to prevent the pump wheel or the insert from wearing on the partition plate, It is also desirable to provide a gasket that is typically made of a wear resistant plastic POM. The result of this is that a large number of parts and components are combined, making the drainage pump high in manufacturing cost and complicated in assembly.
  • the pump impeller 7 and the impeller shaft 20 are of unitary construction such that the pump impeller 20 can pass through the partition plate 23 within the bearing 16 into the permanent magnet 12 rotating chamber, thereby allowing the pump impeller 20 and the pump shaft 13 to
  • the connection is in a liquid-free chamber environment, eliminating the need to consider water corrosion at the joints and greatly simplifying the construction of the drain pump.
  • the pump impeller shaft 20 and the pump shaft 13 are screwed together, and the screw fastening direction coincides with the rotation direction of the pump impeller 7.
  • connection methods such as interference fit connection, adhesive connection or spline connection.
  • the pump wheel shaft 20 has an annular groove in the circumferential direction, and a sealing ring 22 is placed in the groove to completely fill the inner wall of the bearing 16 and the pump shaft A gap between 20, preferably a V-shaped Y-ring, can effectively prevent water from entering the motor cavity 27 from the pump chamber 18.
  • the integrated arrangement of the pump shaft 13 and the permanent magnet 12 also reduces the combination of components.
  • the bearing 16 is coaxially and securely mounted on the bearing housing 17 on the spacer 23, and may be fixed by an interference fit, a bonding or a screw connection, or a sealant may be provided.
  • the seal between the structure of the bearing 16 and the spacer 23 is ensured so that liquid cannot enter the motor cavity 27 from the pump wheel chamber 28 through the mounting faces of both.
  • the bearing 16 of the drain pump of the present invention is in close contact with the permanent magnet 12 or the projection integrally molded with the permanent magnet 12 to form the first contact 24.
  • the first contact 24 defines a stop device that limits axial movement of the bearing 16.
  • the other end of the bearing 16 passes through the center hole of the bearing housing 17 of the spacer 23 and slightly protrudes from the plane of the spacer 23 to closely abut the pump impeller 7 to form a second contact 26.
  • Such a bearing design has two advantages: one is to eliminate the gasket design in the existing bearing design, simplifying the structural composition of the bearing, and the second is that in the bearing design of the present invention, the bottom of the pump wheel is in tight contact with the second bearing The tight fit, so the gap formed between the pump wheel and the isolating plate is extremely small, thereby reducing the pressure difference between the pump wheel during the fast running process, and finally reducing the noise of the working of the drain pump.
  • the bearing material may be stainless steel, brass or engineering plastic. Preferred is the material is cheap, injection molding efficiency High engineering plastic material; further preferably wear-resistant self-lubricating engineering plastic filled with solid grease and reinforcing fibers such as glass fiber carbon fiber.
  • the solid grease is embedded in a fine mesh composed of a myriad of reinforcing fibers as fine small particles, which greatly reduces the coefficient of friction.
  • the maximum water absorption rate of the engineering plastic is 0.2%, so as to prevent the coefficient coefficient from being excessively deformed.
  • the groove is provided on the circumferential surface of the bearing, and the sealing ring is placed, and the pump wheel shaft that is in contact with the rotating operation has no groove structure, and the same sealing effect can be achieved.
  • the pump casing 2 and the motor base 25 are fastened by bolts or screws.
  • the contact portion of the pump casing 2 that is in planar contact with the partition plate 23 is a limiting platform 8, and the limiting platform 8 has a ring shape and a radius. Greater than the radius of the spacer 23, the limit stop 8 limits the axial movement of the spacer 23.
  • the circumferential edge of the partitioning plate 23 is bent toward the motor cavity 27 to form a first pressing sealing structure 9 of the separating plate 23, and the motor base 25 and the partitioning plate 23 are opposite portions, and have projections.
  • a second extrusion sealing structure 29 of the motor base 25 is formed, and the annular sealing ring 11 is pressed against the first extrusion sealing structure 9 and the second extrusion sealing structure 29.
  • the pressing sealing boss structure of the separating plate 23 and the motor base 25 presses the annular sealing ring 11 in the figure to prevent the liquid in the pump casing 2 from entering the inside of the motor housing 25 and preventing the liquid from being passed from the pump casing 2 and the motor base. The junction of 25 leaked.
  • a drain pump according to the present invention has all of the technical features of Embodiments 1-3.
  • a washing machine using the drain pump of any of the above embodiments 1-4 is a washing machine using the drain pump of any of the above embodiments 1-4.
  • the drain pump has a drain pump structure as shown in FIGS. 1 and 2, and includes at least a pump impeller 7, a pump impeller shaft 20, a pump shaft 13, a permanent magnet 12, a bearing 16, a motor base 25, a pump casing 2, and a partition plate 23.
  • the motor base 25 and the pump casing 2 enclose a sealed cavity, and the partition plate 23 divides the sealed cavity into two cavities, one side is a motor cavity 27, and the other side is a pump wheel cavity 28;
  • the pump impeller 7 is located in the pump impeller chamber 28, and the partition plate 23 has a cylindrical structure on the side of the motor chamber 27 to form a bearing seat 17, which is flat on the side of the pump impeller chamber 28;
  • the bearing 16 is fastened and mounted On the bearing block 17, through the central hole of the bearing seat 17 of the separating plate 23, through the two cavities, the bearing 16 slightly protrudes from the plane of the separating plate 23 in the pump wheel chamber 28, and Closely fitting with the pump impeller 7 to form a second contact 26;
  • the pump impeller 7 is integrally molded with the pump impeller shaft 20, and the pump impeller shaft 20 is tightly fixed in the bearing 16 and enters the motor cavity 27 through the partition plate 23. And connected to the pump shaft 13 in the motor cavity 27.
  • the pump impeller shaft 20 and the pump shaft 13 are screwed together, and the screw fastening direction coincides with the rotation direction of the pump impeller 7.
  • connection methods such as interference fit connection, adhesive connection or spline connection.
  • the pump wheel shaft 20 has an annular groove in the circumferential direction, and a sealing ring 22 is placed in the groove to completely fill the inner wall of the bearing 16 and the pump shaft A gap between 20, preferably a V-shaped Y-ring, can effectively prevent water from entering the motor cavity 27 from the pump chamber 18.
  • the integrated arrangement of the pump shaft 13 and the permanent magnet 12 also reduces the combination of components.
  • the bearing 16 is coaxially and securely mounted on the bearing housing 17 on the spacer 23, and may be fixed by an interference fit, adhesive or screw connection, or a sealant may be provided to ensure the structure and isolation of the bearing 16.
  • the seal between the plates 23 prevents liquid from entering the motor cavity 27 from the pump wheel chamber 28 through the mounting faces of both.
  • the bearing 16 of the drain pump of the present invention is in close contact with the permanent magnet 12 or the projection integrally molded with the permanent magnet 12 to form the first contact 24.
  • the first contact 24 defines a stop device that limits axial movement of the bearing 16.
  • the other end of the bearing 16 passes through the center hole of the bearing housing 17 of the spacer 23 and slightly protrudes from the plane of the spacer 23 to closely abut the pump impeller 7 to form a second contact 26.
  • the bearing material may be stainless steel, brass or engineering plastic. Preferred are engineering plastic materials which are inexpensive in material and high in injection molding efficiency; further preferably, wear-resistant self-lubricating engineering plastics are filled with solid grease, and reinforcing fibers such as glass fiber carbon fibers.
  • the solid grease is embedded in a fine mesh composed of a myriad of reinforcing fibers as fine small particles, which greatly reduces the coefficient of friction.
  • the maximum water absorption rate of the engineering plastic is 0.2%, so as to prevent the coefficient coefficient from being excessively deformed.
  • the groove is provided on the circumferential surface of the bearing, and the sealing ring is placed, and the pump wheel shaft that is in contact with the rotating operation has no groove structure, and the same sealing effect can be achieved.
  • the pump casing 2 and the motor base 25 are fastened by bolts or screws.
  • the contact portion of the pump casing 2 that is in planar contact with the partition plate 23 is a limiting platform 8, and the limiting platform 8 has a ring shape and a radius. Greater than the radius of the spacer 23, the limit stop 8 limits the axial movement of the spacer 23.
  • the circumferential edge of the separating plate 23 is bent toward the motor cavity 27 to form a first pressing sealing structure 9 of the separating plate 23, and the motor seat 25 is opposite to the separating plate 23, and has a protruding portion to form a second pressing of the motor base 25.
  • the sealing structure 29 is pressed against the first extrusion sealing structure 9 and the second extrusion sealing structure 29.
  • the pressing sealing boss structure of the separating plate 23 and the motor base 25 presses the annular sealing ring 11 in the figure to prevent the liquid in the pump casing 2 from entering the inside of the motor housing 25 and preventing the liquid from being passed from the pump casing 2 and the motor base. The junction of 25 leaked.
  • the drain pump used in the washing machine of the present invention, the pump impeller 7 and the pump impeller shaft 20 are of unitary construction, such that the pump impeller 20 can pass through the partition plate 23 in the bearing 16 into the rotating chamber of the permanent magnet 12, thereby allowing the pump
  • the connection of the axle 20 to the pump shaft 13 is in a liquid-free chamber environment, thus eliminating the need for water corrosion at the joints and greatly simplifying the construction of the drain pump.
  • the optimized bearing design brings at least two advantages: First, the gasket design in the existing bearing design is eliminated.
  • the structural composition of the bearing is improved.
  • the bottom of the pump wheel and the second contact of the bearing are tightly fitted, so that the gap formed between the pump wheel and the isolating plate is extremely small, thereby reducing the pump wheel.
  • there is a pressure difference on both sides of the pump wheel which ultimately reduces the noise of the working of the drain pump.
  • the washing machine having any one of the drainage pumps of the embodiments 1-4 has a simpler structure, more convenient maintenance, and a lower noise level than the conventional washing machine.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Manufacturing & Machinery (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Abstract

一种排水泵及使用该排水泵的洗衣机，该排水泵的电机座（25）与泵壳（2）围成一个密封腔，隔离板（23）将密封腔分成两个腔体，一侧为电机腔（27），另一侧为泵轮腔（28）；泵轮（7）位于泵轮腔（28）内，隔离板（23）在电机腔（27）侧具有圆筒形结构形成轴承座（17），在泵轮腔（28）侧为平面；轴承（16）紧固安装在轴承座（17）上，通过隔离板（23）的轴承座（17）的中心孔，贯穿上述两个腔体，轴承（16）在泵轮腔（28）内略凸出于隔离板（23）的平面，并与泵轮（7）紧密贴合，形成第二接触；泵轮（7）与泵轮轴（20）为一体注塑，泵轮轴（20）紧密固定在轴承（16）内，穿过隔离板（23）进入电机腔（27），并在电机腔（27）内与泵轴（13）连接。该排水泵及使用该排水泵的洗衣机，有效减少了零部件，组装效率高，密封效果好，同时明显降低了排水泵运行时的噪音。

Description

一种排水泵及使用该排水泵的洗衣机 技术领域
本发明属于排水泵领域，具体地说，涉及一种洗衣机用排水泵。
背景技术
洗衣机为适应更复杂的使用环境以及提供更好的用户使用感受，都使用排水泵作为主动排水设备，目前，洗衣机上使用的排水泵都是永磁式排水泵。永磁式排水泵包括永磁电机，永磁电机的邻近输出轴一端固定有泵体，所述泵体为管状，永磁电机的一端与泵体一端间里密封状连接且永磁电机的输出轴伸入泵体内，永磁电机的输出轴端部固定有泵轮，为了避免泵体内的液体顺着输出轴进入到电机内造成电机损坏，一般会在排水泵的泵体侧的输出泵与隔离板结合部位设置密封垫片，为了安装此类零件，隔离板需要设置为在泵体侧为下沉沉孔设计，这样的设计不但增多了排水泵的零件，增加了排水泵保养的和检修的难度，并降低泵轮整体的可靠性之外，还让泵轮与隔离板之间存在了一个空间，该空间造成了泵轮在快速运转的过程中，泵轮两侧存在压力差，产生一定的噪音。
如何在满足密封条件，保证液体不会通过泵轮腔进入电机腔的前提下，简化排水泵的结构，提高排水泵的可靠性，并且针对噪声产生根源更大限度地降低水泵运行时的噪声，都是目前需要解决的问题。
有鉴于此特提出本发明。
发明内容
本发明要解决的技术问题在于克服现有技术的不足，提供一种排水泵及使用该排水泵的洗衣机，所述排水泵有效减少了零部件，组装效率高，密封效果好，同时明显降低了排水泵运行时的噪音。
为了实现该目的，本发明采用如下技术方案：
一种排水泵，包括泵轮、泵轮轴、泵轴、永磁体、轴承、电机座、泵壳、和隔离板，所述电机座与泵壳围成一个密封腔，所述隔离板将所述密封腔分成两个腔体，一侧为电机腔，另一侧为泵轮腔；所述泵轮位于泵轮腔内，所述隔离板在所述电机腔侧具有圆筒形结构形成轴承座，在所述泵轮腔侧为平面；所述轴承紧固安装在所述轴承座上，通过隔离板的轴承座的中心孔，贯穿上述两个腔体，所述轴承在所述泵轮腔内略凸出于隔离板的平面，并与泵轮紧密贴合，形成第二接触；所述泵轮与泵轮轴为一体注塑，所述泵轮轴紧密固定在所述轴承 内，穿过隔离板进入电机腔,并在所述电机腔内与泵轴连接。
进一步地，所述泵轮轴与泵轴为螺纹连接，螺纹紧固方向与泵轮旋转方向一致。
进一步地，所述泵轮轴圆周方向上具有环形凹槽，所述凹槽内放置有密封圈，完全填充轴承内壁与泵轮轴之间的缝隙。
进一步地，所述泵轴与永磁体一体设置。
进一步地，所述轴承与永磁体或者与所述永磁体一体注塑的凸出部紧密贴合，形成第一接触。
进一步地，泵壳与电机座通过螺栓或者螺钉紧固连接，所述泵壳的与隔离板平面贴合的接触部为限位台，所述限位台为环形，且半径大于隔离板的半径。
进一步地，所述隔离板圆周处边缘向电机腔弯折形成隔离板的第一挤压密封结构。
进一步地，电机座与所述隔离板相对部位，具有凸出部形成电机座的第二挤压密封结构。
进一步地，环形密封圈受压于所述第一挤压密封结构与第二挤压密封结构。
另外还揭示了一种洗衣机，其具有以上任一所述特征的排水泵。
下面结合附图对本发明的具体实施方式作进一步详细的描述。
附图说明
附图作为本发明的一部分，用来提供对本发明的进一步的理解，本发明的示意性实施例及其说明用于解释本发明，但不构成对本发明的不当限定。显然，下面描述中的附图仅仅是一些实施例，对于本领域普通技术人员来说，在不付出创造性劳动的前提下，还可以根据这些附图获得其他附图。在附图中：
图1是本发明排水泵结构剖视图；
图2是本发明排水泵结构局部放大剖视图；
图中：1、排水口，2、泵壳，3、进水口，4、泵塞，5、泵座，6、残水口，7、泵轮，8、限位台，9、第一挤压密封结构，10、连接孔，11、环形密封圈，12、永磁体，13、泵轴，14、硅钢片，15、电机壳，16、轴承，17、轴承座，18、泵腔，19、间隙，20、泵轮轴，21、螺纹连接，22、密封圈，23、隔离板，24、第一接触，25、电机座，26、第二接触，27、电机腔，28、泵轮腔，29、第二挤压密封结构
需要说明的是，这些附图和文字描述并不旨在以任何方式限制本发明的构思范围，而是 通过参考特定实施例为本领域技术人员说明本发明的概念。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对实施例中的技术方案进行清楚、完整地描述，以下实施例用于说明本发明，但不用来限制本发明的范围。
在本发明的描述中，需要说明的是，术语“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本发明中的具体含义。
如图1至图2所示，本发明揭示了一种排水泵和具有该排水泵的洗衣机，该排水泵包括泵轮7、泵轮轴20、泵轴13、永磁体12、轴承16、电机座25、泵壳2、和隔离板23，其特征在于：所述电机座25与泵壳2围成一个密封腔，所述隔离板23将所述密封腔分成两个腔体，一侧为电机腔27，另一侧为泵轮腔28，所述泵轮7位于泵轮腔28内；所述隔离板23在所述电机腔27侧具有圆筒形结构形成轴承座17，在所述泵轮腔28侧为平面；所述轴承16紧固安装在所述轴承座17上，通过隔离板23的轴承座17的中心孔，贯穿上述两个腔体，所述轴承16在所述泵轮腔28内略凸出于隔离板23的平面，并与泵轮7紧密贴合，形成第二接触26；所述泵轮7与泵轮轴20为一体注塑，所述泵轮轴20紧密固定在所述轴承16内，穿过隔离板23进入电机腔27,并在所述电机腔27内与泵轴13连接。
实施例1：
如图1和图2所示，本发明中的排水泵，包括泵轮7、泵轮轴20、泵轴13、永磁体12、轴承16、电机座25、泵壳2、和隔离板23，所述电机座25与泵壳2围成一个密封腔，所述隔离板23将所述密封腔分成两个腔体，一侧为电机腔27，另一侧为泵轮腔28；所述泵轮7位于泵轮腔28内，所述隔离板23在所述电机腔27侧具有圆筒形结构形成轴承座17，在所述泵轮腔28侧为平面；所述轴承16紧固安装在所述轴承座17上，通过隔离板23的轴承座17的中心孔，贯穿上述两个腔体，所述轴承16在所述泵轮腔28内略凸出于隔离板23的平面，并与泵轮7紧密贴合， 形成第二接触26；所述泵轮7与泵轮轴20为一体注塑，所述泵轮轴20紧密固定在所述轴承16内，穿过隔离板23进入电机腔27,并在所述电机腔27内与泵轴13连接。
现有大部分排水泵的设计中，泵轴与泵轮的连接部位是在泵腔侧，即在有液体的环境中。为了使泵轮和泵轴更好地配合在一起，通常在泵轴的末端连接有铜质的嵌件。该嵌件紧紧地插入泵轮与泵轮连接在一起，为了防止液体进入二者连接部位的内部，嵌件还需要设置密封圈结构，同时为了防止泵轮或者嵌件对隔离板产生磨损，还需要设置一般由耐磨塑料POM制成的垫片。这样造成的结果就是造成了大量的零部件组合，使得排水泵的制造成本高，组装复杂。
本发明中泵轮7和泵轮轴20是一体的结构，这样的设计使得泵轮轴20可以在轴承16内穿过隔离板23进入永磁体12旋转腔室，从而让泵轮轴20与泵轴13的连接处处在一个无液体的腔室环境中，因而无需考虑连接处的水腐蚀问题，同时很大程度上简化了排水泵的结构。
本发明中举例说明泵轮轴20与泵轴13是通过螺纹连接在一起的，螺纹紧固方向与泵轮7旋转方向一致。(当然，同领域的技术人员也可以联想到的是通过过盈配合连接、粘合连接或者花键连接等多种连接方式使泵轮轴与泵轴紧固连接)。
为了更好地实现泵轮腔28和电机腔27之间的密封，所述泵轮轴20圆周方向上具有环形凹槽，所述凹槽内放置有密封圈22，完全填充轴承16内壁与泵轮轴20之间的缝隙，优选V型Y型密封圈，可以有效防止水从泵腔18进入电机腔27。
同时泵轴13与永磁体12的一体设置也同样减少了部件的组合。
实施例2：
如图1和图2所示，轴承16同轴紧固地安装在隔离板23上的轴承座17上，可以采用一种过盈配合、粘合或者螺丝连接等方式固定，或者设置密封胶来确保轴承16结构与隔离板23之间的密封，使液体无法通过二者的安装面由泵轮腔28进入电机腔27。
本发明中的排水泵的轴承16与永磁体12或者与所述永磁体12一体注塑的凸出部紧密贴合，形成第一接触24。所述第一接触24形成了限位装置，限制轴承16的轴向运动。轴承16的另一端穿过隔离板23的轴承座17的中心孔且微微凸出于隔离板23的平面，与泵轮7紧紧贴合，形成第二接触26。这样的轴承设计有两个好处：一是取消了现有的轴承设计中的垫片设计，简化了轴承的结构组成，二是在本发明的轴承设计中，泵轮底部与轴承第二接触紧紧贴合，因而泵轮和隔离板之间形成的间隙极小，从而减少了泵轮在快速运转的过程中泵轮两侧存在压力差，最终大幅度减少了排水泵工作的噪音。
所述轴承的材质可以是不锈钢，黄铜以及工程塑料。优选的是材料便宜，注射成型效率 高的工程塑料材质；进一步地优选耐磨自润滑的工程塑料，该工程塑料里面填充有固体润滑脂，和增强纤维如玻纤碳纤等。所述的固体润滑脂作为细微的小颗粒嵌入无数个增强纤维组成的细微网格中，极大地降低了摩擦系数。所述工程塑料最大吸水率0.2％，以防系数系数过大变形。
进一步可以联想到的是，轴承圆周面设置凹槽，放置密封圈，而与之旋转运转接触的泵轮轴无凹槽结构，也能实现同样的密封效果。
另外，泵壳2与电机座25通过螺栓或者螺钉紧固连接，所述泵壳2的与隔离板23平面贴合的接触部为限位台8，所述限位台8为环形，且半径大于隔离板23的半径，该限位台8限制隔离板23的轴向运动。
实施例3：
如图1和图2所示，隔离板23圆周处边缘向电机腔27弯折形成隔离板23的第一挤压密封结构9，电机座25与所述隔离板23相对部位，具有凸出部形成电机座25的第二挤压密封结构29，环形密封圈11受压于所述第一挤压密封结构9与第二挤压密封结构29。隔离板23与电机座25的这种挤压密封凸台结构，将图中的环形密封圈11挤压，防止泵壳2中的液体进入电机座25内部以及防止液体由泵壳2与电机座25的连接处泄露。
实施例4
本发明所述的一种排水泵，具有实施例1-3所有的技术特征。
实施例5：
一种洗衣机，该洗衣机采用上述实施例1-4中任意一种排水泵。
该排水泵具有如图1和图2所示的排水泵结构，至少包括泵轮7、泵轮轴20、泵轴13、永磁体12、轴承16、电机座25、泵壳2、和隔离板23，所述电机座25与泵壳2围成一个密封腔，所述隔离板23将所述密封腔分成两个腔体，一侧为电机腔27，另一侧为泵轮腔28；所述泵轮7位于泵轮腔28内，所述隔离板23在所述电机腔27侧具有圆筒形结构形成轴承座17，在所述泵轮腔28侧为平面；所述轴承16紧固安装在所述轴承座17上，通过隔离板23的轴承座17的中心孔，贯穿上述两个腔体，所述轴承16在所述泵轮腔28内略凸出于隔离板23的平面，并与泵轮7紧密贴合，形成第二接触26；所述泵轮7与泵轮轴20为一体注塑，所述泵轮轴20紧密固定在所述轴承16内，穿过隔离板23进入电机腔27,并在所述电机腔27内与泵轴13连接。
泵轮轴20与泵轴13是通过螺纹连接在一起的，螺纹紧固方向与泵轮7旋转方向一致。(当然，同领域的技术人员也可以联想到的是通过过盈配合连接、粘合连接或者花键连接等多种连接方式使泵轮轴与泵轴紧固连接)。
为了更好地实现泵轮腔28和电机腔27之间的密封，所述泵轮轴20圆周方向上具有环形凹槽，所述凹槽内放置有密封圈22，完全填充轴承16内壁与泵轮轴20之间的缝隙，优选V型Y型密封圈，可以有效防止水从泵腔18进入电机腔27。
同时泵轴13与永磁体12的一体设置也同样减少了部件的组合。
进一步地，轴承16同轴紧固地安装在隔离板23上的轴承座17上，可以采用一种过盈配合、粘合或者螺丝连接等方式固定，或者设置密封胶来确保轴承16结构与隔离板23之间的密封，使液体无法通过二者的安装面由泵轮腔28进入电机腔27。
本发明中的排水泵的轴承16与永磁体12或者与所述永磁体12一体注塑的凸出部紧密贴合，形成第一接触24。所述第一接触24形成了限位装置，限制轴承16的轴向运动。轴承16的另一端穿过隔离板23的轴承座17的中心孔且微微凸出于隔离板23的平面，与泵轮7紧紧贴合，形成第二接触26。所述轴承的材质可以是不锈钢，黄铜以及工程塑料。优选的是材料便宜，注射成型效率高的工程塑料材质；进一步地优选耐磨自润滑的工程塑料，该工程塑料里面填充有固体润滑脂，和增强纤维如玻纤碳纤等。所述的固体润滑脂作为细微的小颗粒嵌入无数个增强纤维组成的细微网格中，极大地降低了摩擦系数。所述工程塑料最大吸水率0.2％，以防系数系数过大变形。
进一步可以联想到的是，轴承圆周面设置凹槽，放置密封圈，而与之旋转运转接触的泵轮轴无凹槽结构，也能实现同样的密封效果。
另外，泵壳2与电机座25通过螺栓或者螺钉紧固连接，所述泵壳2的与隔离板23平面贴合的接触部为限位台8，所述限位台8为环形，且半径大于隔离板23的半径，该限位台8限制隔离板23的轴向运动。
隔离板23圆周处边缘向电机腔27弯折形成隔离板23的第一挤压密封结构9，电机座25与所述隔离板23相对部位，具有凸出部形成电机座25的第二挤压密封结构29，环形密封圈11受压于所述第一挤压密封结构9与第二挤压密封结构29。隔离板23与电机座25的这种挤压密封凸台结构，将图中的环形密封圈11挤压，防止泵壳2中的液体进入电机座25内部以及防止液体由泵壳2与电机座25的连接处泄露。
本发明的洗衣机所使用的排水泵，泵轮7和泵轮轴20是一体的结构，这样的设计使得泵轮轴20可以在轴承16内穿过隔离板23进入永磁体12旋转腔室，从而让泵轮轴20与泵轴13的连接处处在一个无液体的腔室环境中，因而无需考虑连接处的水腐蚀问题，同时很大程度上简化了排水泵的结构。
同时优化的轴承设计带来至少两个好处：一是取消了现有的轴承设计中的垫片设计，简 化了轴承的结构组成，二是在本发明的轴承设计中，泵轮底部与轴承第二接触紧紧贴合，因而泵轮和隔离板之间形成的间隙极小，从而减少了泵轮在快速运转的过程中泵轮两侧存在压力差，最终大幅度减少了排水泵工作的噪音。
因此具有实施例1-4任意一种排水泵的洗衣机，结构更加简单，检修更加方便，同时噪音水平要更低于以往的洗衣机。
以上所述仅是本发明的较佳实施例而已，并非对本发明作任何形式上的限制，虽然本发明已以较佳实施例揭露如上，然而并非用以限定本发明，任何熟悉本专利的技术人员在不脱离本发明技术方案范围内，当可利用上述提示的技术内容作出些许更动或修饰为等同变化的等效实施例，但凡是未脱离本发明技术方案的内容，依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本发明方案的范围内。

Claims (10)

  1. 一种排水泵，包括泵轮(7)、泵轮轴(20)、泵轴(13)、永磁体(12)、轴承(16)、电机座(25)、泵壳(2)、和隔离板(23)，其特征在于：所述电机座(25)与泵壳(2)围成一个密封腔，所述隔离板(23)将所述密封腔分成两个腔体，一侧为电机腔(27)，另一侧为泵轮腔(28)；所述泵轮(7)位于泵轮腔(28)内，所述隔离板(23)在所述电机腔(27)侧具有圆筒形结构形成轴承座(17)，在所述泵轮腔(28)侧为平面；所述轴承(16)紧固安装在所述轴承座(17)上，通过隔离板(23)的轴承座(17)的中心孔，贯穿上述两个腔体，所述轴承(16)在所述泵轮腔(28)内略凸出于隔离板(23)的平面，并与泵轮(7)紧密贴合，形成第二接触(26)；所述泵轮(7)与泵轮轴(20)为一体注塑，所述泵轮轴(20)紧密固定在所述轴承(16)内，穿过隔离板(23)进入电机腔(27),并在所述电机腔(27)内与泵轴(13)连接。
  2. 根据权利要求1所述排水泵，其特征在于：所述泵轮轴(20)与泵轴(13)为螺纹连接，螺纹紧固方向与泵轮(7)旋转方向一致。
  3. 根据权利要求1所述排水泵，其特征在于：所述泵轮轴(20)圆周方向上具有环形凹槽，所述凹槽内放置有密封圈(22)，完全填充轴承(16)内壁与泵轮轴(20)之间的缝隙。
  4. 根据权利要求1所述排水泵，其特征在于：所述泵轴(13)与永磁体(12)一体设置。
  5. 根据权利要求1所述排水泵，其特征在于：所述轴承(16)与永磁体(12)或者与所述永磁体(12)一体注塑的凸出部紧密贴合，形成第一接触(24)。
  6. 根据权利要求1所述排水泵，其特征在于：泵壳(2)与电机座(25)通过螺栓或者螺钉紧固连接，所述泵壳(2)的与隔离板(23)平面贴合的接触部为限位台(8)，所述限位台(8)为环形，且半径大于隔离板(23)的半径。
  7. 根据权利要求1所述排水泵，其特征在于：所述隔离板(23)圆周处边缘向电机腔(28)弯折形成隔离板(23)的第一挤压密封结构(9)。
  8. 根据权利要求7所述排水泵，其特征在于：电机座(25)与所述隔离板(23)相对部位，具有凸出部形成电机座(25)的第二挤压密封结构(29)。
  9. 根据权利要求8所述排水泵，其特征在于：环形密封圈(11)受压于所述第一挤压密封结构(9)与第二挤压密封结构(29)。
  10. 一种洗衣机，其特征在于：具有如权利要求1-9任一所述的排水泵。
PCT/CN2017/093171 2016-07-19 2017-07-17 一种排水泵及使用该排水泵的洗衣机 Ceased WO2018014810A1 (zh)

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