CN110374885A - A kind of pump - Google Patents

A kind of pump Download PDF

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Publication number
CN110374885A
CN110374885A CN201810520535.XA CN201810520535A CN110374885A CN 110374885 A CN110374885 A CN 110374885A CN 201810520535 A CN201810520535 A CN 201810520535A CN 110374885 A CN110374885 A CN 110374885A
Authority
CN
China
Prior art keywords
pump
cavity
pump housing
motor shaft
slot
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.)
Pending
Application number
CN201810520535.XA
Other languages
Chinese (zh)
Inventor
不公告发明人
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.)
SANHUA REFRIGERATION GROUP CO Ltd ZHEJANG
Original Assignee
SANHUA REFRIGERATION GROUP CO Ltd ZHEJANG
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
Priority to CN2018103320086 priority Critical
Priority to CN201810332008 priority
Application filed by SANHUA REFRIGERATION GROUP CO Ltd ZHEJANG filed Critical SANHUA REFRIGERATION GROUP CO Ltd ZHEJANG
Publication of CN110374885A publication Critical patent/CN110374885A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00Pumping installations or systems
    • F04D13/02Units comprising pumps and their driving means
    • F04D13/06Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606Canned motor pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/40Casings; Connections of working fluid
    • F04D29/42Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/58Cooling; Heating; Diminishing heat transfer
    • F04D29/5806Cooling the drive system
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K7/00Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003Couplings; Details of shafts
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K9/00Arrangements for cooling or ventilating
    • H02K9/19Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil

Abstract

The invention discloses a kind of pumps, pump includes the pump housing, motor, impeller, the pump housing includes pump housing inner cavity, and motor includes motor shaft, separation sleeve, rotor, and the inner cavity of separation sleeve includes epicoele and cavity of resorption, separation sleeve includes upper end cover, lower cover, upper end cover is equipped with the first through slot, has axial gap between the bottom of the upper holding tank of upper bearing (metal) and upper end cover, and lower cover is equipped with by-pass prot, rotor is equipped with axially extending bore, and motor shaft is equipped with communicating passage.By-pass prot is connected to pump housing inner cavity and cavity of resorption, and axially extending bore is connected to cavity of resorption and epicoele, and the first through slot is connected to epicoele and axial gap, and communicating passage is connected to axial gap and pump housing inner cavity.Pump provided by the invention can be radiated and be lubricated to motor shaft and bearing.

Description

A kind of pump
Technical field
The present invention relates to fluid control technology fields, more particularly to a kind of pump.
Background technique
Pump is the mechanical equipment for forcing fluid to flow in pipe-line system for generating power.Along with modern industry and Economic rapid development, pump are used widely in household and commercial kitchen area.
Pump includes motor shaft and the bearing set on motor shaft both ends and motor shaft cooperation.It pumps during operation, due to electricity Very little is arranged to obtain in the fit clearance of arbor and bearing, and motor shaft and the mutual friction of bearing phase can generate heat, if without heat dissipation and Lubrication, will affect the service life of pump.
In view of this, how motor shaft and bearing being radiated and be lubricated, improvement is provided for those skilled in the art Project.
Summary of the invention
The object of the present invention is to provide a kind of pumps, can motor shaft and bearing be radiated and be lubricated.
To achieve the above object, the present invention provides a kind of pump, including the pump housing, motor, impeller, the pump housing includes the pump housing Inner cavity, set on the import of the pump housing lower end and set on the outlet of the pump housing side, the impeller is set in the pump housing Chamber;The motor include motor casing, the separation sleeve in the motor casing, set on the inner cavity of the separation sleeve rotor, set In stator, motor shaft outside the separation sleeve;The inner cavity of the separation sleeve includes epicoele above the rotor and is located at rotor The cavity of resorption of lower section, the separation sleeve include upper end cover, lower cover, and the upper end cover is equipped with upper holding tank, and the upper holding tank is solid Surely it is equipped with upper bearing (metal), the internal perisporium of the upper holding tank and/or the periphery wall of the upper bearing (metal) are equipped with the first through slot, the upper axis Hold has axial gap between the bottom of the upper holding tank;The lower cover is equipped with lower holding tank, and the lower holding tank is solid Surely it is equipped with lower bearing, the lower cover includes the first central through hole, by-pass prot;The rotor is equipped with axially extending bore;The motor Axis is equipped with communicating passage, and the motor shaft passes through first central through hole and is fixedly connected with the impeller,
The by-pass prot is connected to the pump housing inner cavity and the cavity of resorption, the axially extending bore be connected to the cavity of resorption and it is described on Chamber, first through slot are connected to the epicoele and the axial gap, the communicating passage be connected to the axial gap with it is described Pump housing inner cavity.
Pump provided by the invention, including the pump housing, motor, impeller, the pump housing include pump housing inner cavity, motor include motor shaft, every From set, rotor, the inner cavity of separation sleeve includes epicoele and cavity of resorption, and separation sleeve includes upper end cover, lower cover, and it is logical that upper end cover is equipped with first There is axial gap, lower cover is equipped with by-pass prot, and rotor is equipped with axis between the bottom of the upper holding tank of slot, upper bearing (metal) and upper end cover To through-hole, motor shaft is equipped with communicating passage.By-pass prot is connected to pump housing inner cavity and cavity of resorption, and axially extending bore is connected to cavity of resorption and epicoele, the One through slot is connected to epicoele and axial gap, and communicating passage is connected to axial gap and pump housing inner cavity.Pump of the invention, can be to motor Axis and bearing are radiated and are lubricated.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of pump provided by the present invention;
Fig. 2 is the structural schematic diagram of lower cover in Fig. 1;
Fig. 3 is the structural schematic diagram of upper end cover in Fig. 1;
Fig. 4 is the structural schematic diagram of another upper end cover;
Fig. 5 is the structural schematic diagram of rotor in Fig. 1;
Fig. 6 is the top view of another motor shaft.
Fig. 1 is into Fig. 6:
The pump housing 1, import 11, outlet 12, pump housing inner cavity 13, low-pressure area 131, higher-pressure region 132;
Motor 2, rotor 21, magnet steel 211, bracket 212;
Cylindrical portion 2121, rib 2122, the second central through hole 213, through-hole 214, stator 22;
Separation sleeve 23, upper end cover 231, upper holding tank 2311, the first through slot 2312;
Internal perisporium 2313, opening portion 2314, bottom 2315;
Lower cover 232, lower holding tank 2324, the first central through hole 2321, by-pass prot 2322;
Annular recess 2323, lower bearing 24, upper bearing (metal) 25, strainer 26, motor casing 27;
Separation sleeve inner cavity 28, epicoele 281, cavity of resorption 282, axial gap 2811;
Motor shaft 3, communicating passage 31, radial slot 32, the second through slot 33, third central through hole 34;
Impeller 4, partition 5;
Interior flat part 51, the 4th central through hole 511, outer flat part 52, flange part 53.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawings and detailed description The present invention is described in further detail.
Herein, the terms such as " upper and lower, inside and outside " are positional relationships based on the figure and establishment, with reference to the accompanying drawings The difference in shown product orientation, corresponding direction and positional relationship are also possible to change therewith, therefore, can not be managed Solution is the absolute limit to protection scope.The axis direction and diameter for axially and radially referring to pump provided by the present invention described below Direction.
Referring to Figure 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, wherein Fig. 1 is the structural schematic diagram of pump provided by the present invention; Fig. 2 is the structural schematic diagram of lower cover in Fig. 1;Fig. 3 is the structural schematic diagram of upper end cover in Fig. 1;Fig. 4 is another upper end cover Structural schematic diagram;Fig. 5 is the structural schematic diagram of rotor in Fig. 1;Fig. 6 is the top view of another motor shaft.
As shown in Figure 1, pump provided in this embodiment, including the pump housing 1, motor 2, impeller 4.The pump housing 1 and motor 2 pass through screw It is fixedly connected, naturally it is also possible to be fixedly connected by modes such as riveting, ultrasonic bonding or laser weldings.The pump housing 1 includes being set to The import 11 of lower end and outlet 12 set on side.The substantially cup-shaped of the pump housing 1, with receiving portion, the receiving portion is as pump Intracoelomic cavity 13, impeller 4 are set in the pump housing inner cavity 13.By being powered to motor 2, driving impeller 4 rotates, and the rotation of impeller 4 makes leaf Wheel is centrally formed low-pressure area 131, and higher-pressure region 132 is formed around impeller, and the import of the pump housing 1 is set to low-pressure area 131, and the pump housing 1 goes out Mouth 12 is set to higher-pressure region 132 and fluid is delivered to outlet 12 from import 11 under the action of the centrifugal force.
Motor 2 includes motor shaft 3, motor casing 27, the separation sleeve 23 in the motor casing 27, is set to separation sleeve inner cavity 28 Rotor 21, the stator 22 outside separation sleeve 23.Separation sleeve inner cavity 28 includes being located at the epicoele 281 of 21 top of rotor and being located at The cavity of resorption 282 of 21 lower section of rotor.Separation sleeve 23 includes upper end cover 231, lower cover 232 and connection upper end cover 231, lower cover 232 sleeve.Upper end cover 231, lower cover 232 are made of stainless steel materials cutting, punching press respectively, and sleeve is by thin-wall stainless steel Material is cut into, then by the way that composition separation sleeve 23 is welded and fixed.Upper end cover 231 is equipped with upper holding tank 2311, holding tank on this 2311 are provided with upper bearing (metal) 25 by interference fit, and the internal perisporium 2313 of upper holding tank 2311 is equipped with the first through slot 2312, or on The periphery wall of bearing 25 is equipped with the internal perisporium 2313 of the first through slot 2312 or upper holding tank 2311 and the periphery of upper bearing (metal) 25 Wall is equipped with the first through slot 2312, has axial gap 2811 between upper bearing (metal) 25 and the bottom 2315 of upper holding tank 2311, above-mentioned First through slot 2312 is connected to epicoele 281 and axial gap 2811;Equally, lower cover 232 is equipped with lower holding tank 2324, lower holding tank 2324 are provided with lower bearing 24 also by interference fit, and lower cover 232 is equipped with the first central through hole 2321, opposite first center leads to The symmetrically arranged by-pass prot 2322 in the axle center in hole 2321, the by-pass prot 2322 are connected to pump housing inner cavity 13 and cavity of resorption 282.Rotor 21 is set There is through-hole 214, which is connected to epicoele 281 and cavity of resorption 282.
Motor shaft 3 is equipped with communicating passage 31, and communicating passage 31 is connected to axial gap 2811 and pump housing inner cavity 13.Motor shaft 3 It is fixedly connected across the first central through hole 2321 and with impeller 4.Motor shaft 3 is made of stainless steel bars Vehicle Processing, respectively with Lower bearing 24 and the cooperation of 25 small―gap suture of upper bearing (metal), consider, the fit clearance of usual motor shaft and bearing for pump run stability It is located in the range of 0.02-0.08mm.
In the present embodiment, by the rotation of impeller 4, the fluid in pump housing inner cavity 13 is made to pass sequentially through the 232 of lower cover By-pass prot 2322, cavity of resorption 282, the through-hole 214 of rotor 21, epicoele 281, upper holding tank 2311 and/or upper bearing (metal) 25 first Through slot 2312, radial clearance 2811, the communicating passage 31 of motor shaft 3, return in pump housing inner cavity 13, form a recycle stream Road, in the present embodiment, import of 232 by-pass prot 2322 of lower cover as circulatory flow is located at higher-pressure region 132, motor Outlet of the communicating passage 31 of axis 3 as circulatory flow is located at low-pressure area 131, the import of circulatory flow and going out for circulatory flow Mouth is located at the different radial positions of pump, could form pressure difference in this way, enable flow across circulatory flow.By the way that the recycle stream is arranged The fit clearance that road flows into fluid constantly between upper bearing (metal) 25, lower bearing 24 and motor shaft 3 is lubricated, and is reduced between the two Abrasion, improve the operation stability of pump, extend the service life of pump.Fluid can take away upper bearing (metal) 25, lower axle simultaneously The heat generated between 24 and motor shaft 3 by friction is held, is radiated to pump.
Further, as shown in figure 5, motor shaft 3 is equipped with third central through hole 34 and radial slot 32, radial slot 32 is opened in One end of the separate import 11 of motor shaft 3, third central through hole 34 and radial slot 32 are used as communicating passage 31.
Certainly, the other end is extended to as shown in fig. 6, can also be arranged in the outer rim of motor shaft 3 from one end of motor shaft 3 Second through slot 33, the second through slot 33 is at least arranged 2, and the axle center of opposite motor shaft 3 is symmetrical arranged, and the second through slot 33 is as company Circulation passage 31.So set, be conducive to increase the throughput of fluid, enhancing heat dissipation and lubricant effect;And so set, work as fluid When flowing through the second through slot 33, balanced is reached to the radial force that motor shaft 3 applies, keeps pump operation steady.
Further, as shown in figure 5, rotor 21 includes magnet steel 211 and bracket 212, magnet steel 211 is magnetic material, bracket 212 be plastic material, and the two is by being integrally formed.Bracket 212 includes centrally located cylindrical portion 2121 and from the cylinder The rib 2122 that portion 2121 radially extends forms radial clearance between consecutive web 2122, which forms through-hole 214.Cylindrical portion 2121 be equipped with the second central through hole 213, motor shaft 3 pass through second central through hole 213 and with cylindrical portion 2121 It is fixedly connected.
Further, as shown in Figure 3, Figure 4, above-mentioned first through slot 2312 is from the opening portion 2314 of upper holding tank 2311 along interior 2313 axial direction of peripheral wall or spiral extension are to bottom 2315.It is of course also possible to which the periphery wall setting first in upper bearing (metal) 25 is logical Slot 2312.So set, can enable flow across between upper bearing (metal) 25 and upper end cover 231, upper axis in pump operation process can be taken away Hold the heat generated by friction.
Further, as shown in Fig. 2, lower cover 232 is additionally provided with annular groove 2323, passed through in annular groove 2323 The fit system that is full of is chimeric annular filter screen 26, which covers by-pass prot 2322, and it is recessed that by-pass prot 2322 is located at the annular The bottom of slot 2323, by-pass prot 2322 is at least arranged 2, and the axle center of opposite first central through hole 2321 is symmetrical arranged.It is above-mentioned Annular filter screen 26 is used to filter the impurity in fluid, and impurity is made not to be caught in the cooperation of lower bearing 24, upper bearing (metal) 25 and motor shaft 3 In gap, it is stuck motor shaft 3 is not will lead to.
Further, as shown in Figure 1, pump further includes partition 5, partition 5 is made of stainless steel materials punching press, including interior plate Portion 51, outer flat part 52, the flange part 53 for connecting interior flat part 51 and outer flat part 52.Specifically, interior flat part 51 and lower end For lid 232 by being welded and fixed, interior flat part 51 is additionally provided with the 4th central through hole 511, which does not cover bypass axially Hole 2322.The pump housing 1 and the sandwiched outer flat part 52 of motor casing 27, or sealing ring, the pump housing are first placed between the pump housing 1 and motor casing 27 1 and motor casing 27 pass through the sandwiched outer flat part 52 of sealing ring.It is cooperatively formed by outer flat part 52, separation sleeve 23, motor casing 27 Bore of stator (not shown), stator 22 are set in the bore of stator.Partition 5 is connected to bore of stator not with pump housing inner cavity 13, makes fluid not It avoids burning out stator 22 into bore of stator.The intensity for being conducive to enhance partition 5 by the way that flange part 53 is arranged, will not be because of fluid Impact force leads to 5 bending deformation of partition.
Pump provided by the present invention is described in detail above.Herein only for specific embodiments of the present invention into Elaboration is gone, the explanation of embodiments above is merely used to help understand method and its core concept of the invention.It should refer to It out, for those skilled in the art, should if can also make under the premise of not departing from feature of the present invention Improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (8)

1. a kind of pump, including the pump housing, motor, impeller, the pump housing includes pump housing inner cavity, the import set on the pump housing lower end With the outlet for being set to the pump housing side, the impeller is set to the pump housing inner cavity;The motor include motor shaft, motor casing, Separation sleeve in the motor casing, the rotor in the separation sleeve, the stator outside the separation sleeve;It is described every From the inner cavity of set include epicoele above the rotor and the cavity of resorption below the rotor, the separation sleeve include upper End cap, lower cover, the upper end cover are equipped with upper holding tank, and the upper holding tank is fixed with upper bearing (metal), the upper holding tank The periphery wall of internal perisporium and/or the upper bearing (metal) is equipped with the first through slot, between the upper bearing (metal) and the bottom of the upper holding tank With axial gap;The lower cover is equipped with lower holding tank, and the lower holding tank is fixed with lower bearing, and the lower cover includes First central through hole, by-pass prot;The rotor is equipped with axially extending bore;The motor shaft is equipped with communicating passage, and the motor shaft is worn It crosses first central through hole to be fixedly connected with the impeller, the by-pass prot is connected to the pump housing inner cavity and the cavity of resorption, institute It states axially extending bore and is connected to the cavity of resorption and the epicoele, first through slot is connected to the epicoele and the axial gap, described Communicating passage is connected to the axial gap and the pump housing inner cavity.
2. pump according to claim 1, which is characterized in that the motor shaft includes third central through hole and radial slot, institute One end far from the import that radial slot is located at the motor shaft is stated, the radial slot and the third central through hole are as institute State communicating passage.
3. pump according to claim 1, which is characterized in that the outer rim of the motor shaft is equipped with from one end of the motor shaft The second through slot of the other end is extended to, second through slot is at least 2, and the axle center of the relatively described motor shaft is symmetrical arranged, Second through slot is as the communicating passage.
4. pump according to claim 1, which is characterized in that the rotor includes magnet steel and bracket, and the bracket includes circle Canister portion and the rib to extend radially outwardly from the cylindrical portion, the radial clearance between the adjacent rib form the through-hole, The cylindrical portion is equipped with the second central through hole, and the motor shaft, which passes through second central through hole and fixes with the cylindrical portion, to be connected It connects.
5. pump according to claim 1, which is characterized in that first through slot is from the opening portion of the upper holding tank along institute State the bottom that internal perisporium axially extends to the upper holding tank;
Or, first through slot is from the opening portion of the upper holding tank along the internal perisporium spiral extension to the upper holding tank Bottom.
6. pump according to claim 1-5, which is characterized in that the lower cover further includes annular recess, described Annular recess is equipped with the strainer for covering the by-pass prot, and the by-pass prot is at least 2, and relatively described first central through hole Axle center is symmetrical arranged, and the by-pass prot is set to the bottom of the annular recess.
7. pump according to claim 1-5, which is characterized in that the pump further includes partition, and the partition includes Interior flat part, outer flat part, the connection interior flat part and the outer flat part flange part, the interior flat part and it is described under End cap is welded and fixed, and the interior flat part is equipped with the 4th central through hole, and the interior flat part does not cover the by-pass prot, institute axially It is directly or indirectly sandwiched by the pump housing and the motor casing to state outer flat part.
8. pump according to claim 1, which is characterized in that the motor can drive the impeller to rotate, the impeller Be centrally formed low-pressure area, form higher-pressure region around the impeller, the import is set to the low-pressure area, and the outlet is set to The higher-pressure region.
CN201810520535.XA 2018-04-13 2018-05-28 A kind of pump Pending CN110374885A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2018103320086 2018-04-13
CN201810332008 2018-04-13

Publications (1)

Publication Number Publication Date
CN110374885A true CN110374885A (en) 2019-10-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810520535.XA Pending CN110374885A (en) 2018-04-13 2018-05-28 A kind of pump

Country Status (1)

Country Link
CN (1) CN110374885A (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10238491A (en) * 1997-02-26 1998-09-08 Nikkiso Co Ltd Canned motor pump
US6174143B1 (en) * 1997-10-31 2001-01-16 Siemens Canada Limited Pump motor having submersible stator and rotor and insulated winding set terminals
CN201223150Y (en) * 2008-04-11 2009-04-22 宁波市明达现代办公设备有限公司 Baffle with reinforcing rods
RU2470189C1 (en) * 2011-06-16 2012-12-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Поволжский государственный технологический университет" Radial-flow pump with wet motor
CN203130530U (en) * 2013-03-12 2013-08-14 上海新源动力有限公司 Inner-circulation compulsory water-cooling electric water pump
CN204168020U (en) * 2014-07-03 2015-02-18 扬州科光技术发展有限公司 A kind of permanent magnet machine rotor
CN106936239A (en) * 2015-12-31 2017-07-07 丹佛斯(天津)有限公司 rotating shaft, motor and compressor for motor
CN107725395A (en) * 2017-10-25 2018-02-23 常州威灵电机制造有限公司 Electronic water pump

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10238491A (en) * 1997-02-26 1998-09-08 Nikkiso Co Ltd Canned motor pump
US6174143B1 (en) * 1997-10-31 2001-01-16 Siemens Canada Limited Pump motor having submersible stator and rotor and insulated winding set terminals
CN201223150Y (en) * 2008-04-11 2009-04-22 宁波市明达现代办公设备有限公司 Baffle with reinforcing rods
RU2470189C1 (en) * 2011-06-16 2012-12-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Поволжский государственный технологический университет" Radial-flow pump with wet motor
CN203130530U (en) * 2013-03-12 2013-08-14 上海新源动力有限公司 Inner-circulation compulsory water-cooling electric water pump
CN204168020U (en) * 2014-07-03 2015-02-18 扬州科光技术发展有限公司 A kind of permanent magnet machine rotor
CN106936239A (en) * 2015-12-31 2017-07-07 丹佛斯(天津)有限公司 rotating shaft, motor and compressor for motor
CN107725395A (en) * 2017-10-25 2018-02-23 常州威灵电机制造有限公司 Electronic water pump

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