CN107725392B - Electronic pump - Google Patents
Electronic pump Download PDFInfo
- Publication number
- CN107725392B CN107725392B CN201610658710.2A CN201610658710A CN107725392B CN 107725392 B CN107725392 B CN 107725392B CN 201610658710 A CN201610658710 A CN 201610658710A CN 107725392 B CN107725392 B CN 107725392B
- Authority
- CN
- China
- Prior art keywords
- pump
- diameter
- circumference
- pump shaft
- blade
- 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.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2261—Rotors specially for centrifugal pumps with special measures
- F04D29/2266—Rotors specially for centrifugal pumps with special measures for sealing or thrust balance
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
An electronic pump comprises a rotor assembly, the rotor assembly comprises a rotor and an impeller, the impeller comprises an upper cover plate, a lower cover plate and blades, the blades are formed between the upper cover plate and the lower cover plate, the blades comprise a first blade and a second blade, the outer edge of the upper cover plate is defined as a first circumference, the second blade starts from a second circumference, the diameter of the first circumference is a first diameter, the diameter of the second circumference is a second diameter, the second diameter is equal to 0.6-0.7 times of the first diameter, the first blade starts from a third circumference, the diameter of the third circumference is a third diameter, the lower cover plate of the impeller is formed with a balance hole, the center of the balance hole is located in a fourth circumference, the diameter of the fourth circumference is a fourth diameter, and the fourth diameter is larger than the third diameter and smaller than the second diameter; therefore, the pressure of the upper side and the lower side of the lower cover plate is balanced, the axial force of the upward movement of the rotor assembly is reduced, the limiting element is favorable for reducing abrasion, and the service life of the electronic pump is prolonged.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to a heat cycle system, in particular to an electronic pump.
[ background of the invention ]
In recent decades, electronic pumps have gradually replaced conventional mechanical pumps and are widely used in heat cycle systems. The electronic pump has the advantages of no electromagnetic interference, high efficiency, environmental protection, stepless speed regulation and the like, and can well meet the market requirement.
The electronic pump comprises a rotor assembly, the rotor assembly comprises an impeller and a rotor, the impeller and the rotor rotate around the pump shaft, the impeller is limited by a limiting device along the axial direction of the pump shaft, but when the electronic pump runs, the rotor assembly can cause the abrasion of the limiting device and even cause the function failure.
Therefore, there is a need for improvement of the prior art to solve the above technical problems.
[ summary of the invention ]
The invention aims to provide an electronic pump, which can improve the abrasion of a limiting part and prolong the service life of the electronic pump.
In order to achieve the purpose, the invention adopts the following technical scheme: an electronic pump comprises a pump shell, a pump shaft, a rotor assembly and a limiting part, wherein the pump shell is provided with a pump inner cavity, the rotor assembly is arranged in the pump inner cavity, the limiting part limits the position of the rotor assembly in the pump inner cavity, one end of the pump shaft is fixedly arranged with the pump shell, the other end of the pump shaft extends into the pump inner cavity in a cantilever manner, the rotor assembly is sleeved on the outer peripheral surface of the pump shaft and can rotate around the pump shaft, the rotor assembly comprises a rotor and an impeller, the rotor is fixedly connected with the impeller, the rotor comprises a permanent magnet, the impeller comprises an upper cover plate, a lower cover plate and blades, the blades are formed between the upper cover plate and the lower cover plate and comprise first blades and second blades, and the length of the first blades is greater than that of the second blades, the first blades and the second blades are distributed at intervals, the outer edge of the upper cover plate is defined as a first circumference, the diameter of the first circumference is a first diameter, a second circumference is defined, the second blades start from the second circumference, the diameter of the second circumference is a second diameter, the second diameter is equal to 0.6-0.7 times of the first diameter, a third circumference is defined, the first blades start from the third circumference, the diameter of the third circumference is a third diameter, the lower cover plate of the impeller is formed with balance holes, a fourth circumference is defined, the center of each balance hole is located at the fourth circumference, the diameter of the fourth circumference is a fourth diameter, the fourth diameter is larger than the third diameter, and the fourth diameter is smaller than the second diameter.
Compared with the prior art, the impeller comprises the upper cover plate, the blades and the lower cover plate, the lower cover plate is provided with the balance hole, so that the pressure on the upper side and the lower side of the lower cover plate is balanced, the axial force of the upward movement of the rotor assembly is reduced, the limiting element is favorable for reducing abrasion, and the service life of the electronic pump is prolonged.
[ description of the drawings ]
FIG. 1 is a schematic cross-sectional view of an electronic pump;
FIG. 2 is an exploded schematic view of a rotor assembly of the electronic pump;
FIG. 3 is a cross-sectional structural view of the rotor assembly of FIG. 1;
FIG. 4 is a schematic cross-sectional view of the second portion of FIG. 2;
FIG. 5 is a schematic view of one construction of the spacing element of FIG. 1;
FIG. 6 is a schematic front view of a first portion of the rotor assembly of FIG. 3;
fig. 7 is a schematic front view of the second part of fig. 2.
[ detailed description ] embodiments
The invention will be further described with reference to the following figures and specific examples:
fig. 1 is a schematic structural diagram of an embodiment of an electronic pump 100, in which the electronic pump 100 includes a pump housing capable of forming a pump cavity, in this embodiment, the pump housing includes a pump cover 10, an isolation sleeve 20, and a motor housing 30; in the embodiment, the pump cover 10, the isolation sleeve 20 and the motor housing 30 are respectively formed by injection molding, the pump cover 10 and the isolation sleeve 20 and the motor housing 30 are fixedly connected through the screws 120 or the bolts, and the sealing rings 130 are respectively arranged at the connection part of the pump cover 10 and the isolation sleeve 20 and the connection part of the isolation sleeve 20 and the motor housing 30, so that the sealing performance of the connection part can be improved; the isolating sleeve 20 divides the inner cavity of the pump into a wet cavity 91 and a dry cavity 92, wherein a working medium can flow through the wet cavity 91, and no working medium flows through the dry cavity 92; of course, the pump housing may have other structures, and the structure of the pump housing adopted in this embodiment is relatively simple in manufacturing process and convenient in assembling parts. The electronic pump 100 in this embodiment is mainly used in a heat cycle system, the heat cycle system includes a cooling cycle system and/or a heating cycle system, and the electronic pump 100 is used to provide a circulating power for a circulating medium. The electronic pump 100 in the present embodiment may be applied to a vehicle cooling circulation system. The electronic pump 100 in this embodiment can be applied to the occasions with small volume and high lift requirements.
The electronic pump 100 further includes a pump shaft 40, a rotor assembly 50, a stator assembly 60, and a control unit 70; rotor assembly 50 is disposed in wet chamber 91, and stator assembly 60 and control unit 70 are disposed in dry chamber 92; the pump shaft 40 and the isolation sleeve 20 are fixed through injection molding, the rotor assembly 50 can rotate around the pump shaft 40, the rotor assembly 50 comprises an impeller 5 and a rotor 4, the rotor 4 comprises a permanent magnet 41, the rotor assembly 50 and the stator assembly 60 are separated through the isolation sleeve 20, the stator assembly 60 is electrically connected with the control unit 70, and the control unit 70 is electrically connected with an external power supply or a signal circuit through a connecting line. In the present embodiment, the electronic pump 100 is an inner rotor type electronic pump, which means that the permanent magnet of the rotor assembly 50 is disposed closer to the pump shaft 40 than the stator assembly 60.
The rotor assembly 50 comprises at least a two-part injection molded part: a first portion 501 and a second portion 502. The first portion 501 and the second portion 502 are secured by welding, such as ultrasonic welding. The first part 501 comprises an upper cover plate 51 and blades 52, and the first part 501 is integrally injection-molded, wherein in one embodiment, the injection-molded material is a mixture comprising polyphenylene sulfide plastic (PPS plastic for short) and glass fibers; the second part 502 comprises the lower cover plate 53, the permanent magnet 41 and the first bearing 42, the second part 502 comprises a rotor injection molding part which is formed by taking the permanent magnet 41 and the first bearing 42 as injection inserts and injecting a molding material to form a molding layer, wherein the molding material of the molding layer in one embodiment comprises a mixture of polyphenylene sulfide plastic (abbreviated as PPS plastic) and glass fiber, and the molding material of the molding layer can be other thermoplastic materials with relatively good mechanical properties. The first portion 501 and the second portion 502 are fixed integrally by welding.
The electronic pump 100 further includes a limiting portion of the rotor assembly, through which the rotor assembly 50 is limited to the pump cavity, and particularly, the movement of the rotor assembly is limited to a corresponding position range of the pump cavity. The limiting portion includes a pump shaft 40, a first limiting portion 1 and a second limiting portion 2, specifically, the rotor assembly 50 is disposed at the periphery of the pump shaft 40, and then the pump shaft 40 defines a rotation center position of the rotor assembly 50, the first limiting portion 1 is used for limiting an upper end position of the rotor assembly 50, specifically, the first limiting portion 1 is used for limiting a movement position of the rotor assembly 50 toward an inlet of the electronic pump 100 along the pump shaft 40 due to an axial force when the rotor assembly is started. The second position-limiting part 2 is used for limiting the lower end position of the rotor assembly 50, and specifically, the second position-limiting part 2 is used for limiting the position of the rotor assembly 50 moving towards the fixed end of the pump shaft 40 along the pump shaft 40 when the rotor assembly 50 stops rotating. The first and second position-limiting portions 1 and 2 are fixedly disposed relative to the pump shaft 40, and the first and second position-limiting portions 1 and 2 can limit the position of the rotor assembly 50 relative to the pump shaft 40. Therefore, the first limiting part and the second limiting part are fixedly arranged relative to the pump shaft, so that the abrasion of the pump shaft to the first limiting part and the second limiting part can be reduced, the noise of relative motion can also be reduced, and the service life of a product is prolonged.
The first limit part 1 comprises a limit element 11 and a connecting element 12, the connecting element 12 is connected with the pump shaft 40, the limit element 11 is fixed with the pump shaft 40 through the connecting element 12, and the limit element 11 blocks the upward movement distance and the stop position of the rotor assembly 50 along the axial direction of the pump shaft 40, so that the maximum axial movement distance of the rotor assembly 50 towards the free end of the pump shaft does not exceed the fixed position of the pump shaft 40 where the limit element 11 is located.
Referring to fig. 5, the position limiting element 11 is made of a metal material and has a certain thickness and hardness, the position limiting element 11 is formed with a central hole 110, the position limiting element 11 includes an upper end surface 111 and a lower end surface 112, the upper end surface and the lower end surface are subjected to surface treatment to reduce the friction coefficient of the upper end surface and the lower end surface, or at least the lower end surface 112 is subjected to surface treatment, so that when the electronic pump works, the friction force between the rotor assembly 50 and the position limiting element 11 can be reduced, generally, the surface roughness of the lower end surface 112 is less than 1.6, in the embodiment, in order to prevent installation errors, the surface roughness of the upper end surface and the lower end surface is less than 1; the central hole 110 of the limiting element 11 is used for the connecting element 12 to pass through and is fixed with the pump shaft 40; in order to reduce wear of the stop element 11, at least the lower end face 112 is coated with a diamond-like coating, and in order to prevent mounting errors, both the upper end face 111 and the lower end face 112 may be coated with a diamond-like coating.
The connecting element 12 comprises a screw having a flat portion in mating contact with the upper end surface 111 of the stop element; the pump shaft 40 comprises a connecting part which is used for being matched and connected with the connecting element 2, and the connecting part comprises a threaded hole 4011; the pump shaft 40 is formed with a threaded hole 4011, the threaded hole 4011 extends from the free end to the inside of the pump shaft 40 along the axial direction of the pump shaft 40, a screw is in threaded connection with the threaded hole 4011, and the screw presses the limit element 11 to the free end of the pump shaft 40, so that the limit element 11 is fixedly connected with the pump shaft 40.
A gasket 58 is arranged between the second limiting part 2 and the rotor assembly, so that impact abrasion of the rotor assembly and the second limiting part is reduced.
The impeller 5 includes an upper cover plate 51, a lower cover plate 53 and blades 52, the blades 52 are disposed between the upper cover plate 51 and the lower cover plate 53, in this embodiment, the blades 52 include a first blade 521 and a second blade 522, the length of the first blade 521 is greater than the length of the second blade 522, the first blade 521 and the second blade 522 are arranged at intervals, the impeller 5 includes four first blades 521 and four second blades 522, the outer edge of the upper cover plate 51 or the lower cover plate 53 is defined as a first circumference, the diameter of the first circumference is a first diameter Φ 1, the second blade 522 starts from a second circumference, the diameter of the second circumference is a second diameter Φ 2, and the second diameter Φ 2 is equal to 0.6 times to 0.7 times of the first diameter Φ 1. The first blade 521 comprises a first side face 733 and a second side face 744, the first side face 733 being concave and the second side face 744 being convex; a third circumference is defined having a third diameter Φ 3, from which the first vanes start, the third diameter Φ 3 being smaller than the second diameter Φ 2.
In the present embodiment, the blades 52 are integrally injection-molded with the upper cover plate 51, the lower cover plate 53 is provided with mounting grooves 532, the mounting grooves 532 are provided corresponding to the first blades 521, each mounting groove 532 includes a concave side 533 and a convex side 534, the concave side 533 corresponds to the first side 733 of the first blade 521, and the convex side 534 corresponds to the second side 733 of the first blade 521. The first blade is installed corresponding to the installation groove, and the first blade 521 and the lower cover plate 53 are welded and fixed into a whole.
In order to further balance the axial force at the two ends of the rotor assembly 50 and reduce the abrasion of the limiting element 11 of the first limiting part 1, a balancing hole 531 is formed in the lower cover plate 53 of the impeller 5, and the balancing hole 531 can be communicated with the upper side and the lower side of the lower cover plate 53, so that the pressure difference between the upper side and the lower side of the lower cover plate 53 is reduced, the upward movement acting force of the rotor assembly 50 is favorably reduced, and the abrasion of the limiting element 11 is favorably reduced by the rotor assembly.
Defining a fourth circumference, wherein the center of the balancing hole 531 is located on the fourth circumference, the number of the balancing holes is multiple in the embodiment, the diameter of the fourth circumference is a fourth diameter Φ 4, the fourth diameter Φ 4 is larger than the third diameter Φ 3, and the fourth diameter Φ 4 is smaller than the second diameter Φ 2; in this way, the balancing holes are arranged as far as possible between the adjacent first vanes 521 and in the region of the third and second circumferential diameters, which is advantageous for reducing the influence of the balancing holes on the flow of the impeller working medium.
The number of the balance holes 531 is greater than or equal to two, the total flow area of the balance holes 531 is equal to the sum of the flow area of each balance hole 531, an annular gap 301 is formed between the outer edge of the impeller 5 and the shell, the working medium passes through the annular gap 301, an annular flow cross section area is formed on the working medium by the annular gap 301, and the balance holes 531 are distributed in the annular gapThe total flow area of the holes 531 is equal to 5 to 8 times the annular flow cross-sectional area. When the electronic pump works, the working medium enters the impeller, enters the wet cavity below the lower cover plate 53 through the annular gap 301, the annular gap 301 thus communicates between the wet chamber above the lower cover plate 53 and the wet chamber below the lower cover plate 53, since the pressure of the working medium gradually increases from the center of the impeller 5 to the outer edge of the impeller, the pressure of the wet chamber below the lower cover plate 53 is approximately the same as the pressure of the outer edge of the impeller 5, so that the pressure of the wet chamber below the lower cover plate 53 is greater than the pressure of the wet chamber above the lower cover plate, due to the pressure difference, the impeller 5 moves towards the free end of the pump shaft, so that the total flow area of the balance holes 531 is ensured to be larger than or equal to the annular flow cross-sectional area, since the pressure of the working medium at the annular flow cross-section is greater than the pressure of the working medium at the balancing holes, the total flow area of the balancing holes can be increased in order to further reduce the pressure difference. The design is favorable for reducing pressure difference, reduces the pressure of the rotor component moving towards the direction of the free end of the pump shaft, and then reduces the force borne by the first limiting part and reduces abrasion. Specifically, the total flow area of the balance holes 531 is 3mm or more2Less than or equal to 18mm2. The impeller 5 comprises 4 balancing holes 531, the flow cross section of the balancing holes 531 is approximately circular, and the flow area of each balancing hole 531 is larger than 1.7mm2Less than 3.2mm2(ii) a Therefore, the communication of the working medium is ensured, and the circulation of the working medium in the adjacent blades is not influenced.
After the impeller is assembled, the balancing hole 531 is disposed between the adjacent first blades 521, specifically, the balancing hole 531 is disposed between the adjacent mounting grooves 532, and a distance between an outer edge of the balancing hole 531 and a concave side surface 533 of the mounting groove 532 where the balancing hole 531 is closer to is greater than or equal to 1 mm. Further, when the balance hole 531 is projected to the corresponding upper cover plate 51, the upper end surface direction is upward from the lower end surface of the upper cover plate 51 along the axial direction of the impeller 5, a line connecting the start end S of the second blade 522 and the center O of the impeller forms a first line segment SO, a line connecting the start end F of the first blade 521 adjacent to the concave surface side of the second blade 522 and the center O of the impeller 5 forms a second line segment FO, a line connecting the center P of the balance hole 531 and the center O of the impeller forms a third line segment PO, an intersection point C of the second circumference and the first side surface of the first blade close to the balance hole forms a fourth line segment CO, an included angle between the first line segment SO and the fourth line segment CO is a first included angle α, an included angle between the third line segment PO and the second line segment FO is a second included angle β, and the second included angle β is smaller than the first included angle α.
It should be noted that: although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the present invention may be modified and equivalents may be substituted for those skilled in the art, and all technical solutions and modifications that do not depart from the spirit and scope of the present invention should be covered by the claims of the present invention.
Claims (11)
1. The utility model provides an electronic pump, includes pump casing, pump shaft, rotor subassembly and spacing portion, the pump casing is formed with the pump inner chamber, the rotor subassembly set up in the pump inner chamber, spacing portion restriction the rotor subassembly is in the position of pump inner chamber, its characterized in that: one end of the pump shaft is fixedly arranged with the pump shell, the other end of the pump shaft extends into the inner cavity of the pump in a cantilever manner, the rotor assembly is sleeved on the outer peripheral surface of the pump shaft and can rotate around the pump shaft, the rotor assembly comprises a rotor and an impeller, the rotor is fixedly connected with the impeller, the rotor comprises a permanent magnet, the impeller comprises an upper cover plate, a lower cover plate and blades, the blades are formed between the upper cover plate and the lower cover plate, the blades comprise a first blade and a second blade, the length of the first blade is greater than that of the second blade, the first blade and the second blade are distributed at intervals, the outer edge of the upper cover plate is defined as a first circumference, the diameter of the first circumference is a first diameter, a second circumference is defined, the second blade starts from the second circumference, and the diameter of the second circumference is a second diameter, the second diameter is equal to 0.6 to 0.7 times the first diameter, defining a third circumference from which the first vane originates, the third circumference having a third diameter, the lower cover plate of the impeller being formed with a balancing hole defining a fourth circumference, the balancing hole having a center at the fourth circumference, the fourth circumference having a fourth diameter, the fourth diameter being greater than the third diameter and the fourth diameter being less than the second diameter; projecting the balance hole onto the upper cover plate from the lower end surface of the upper cover plate in the axial direction of the impeller to the upper end surface direction, wherein a line connecting the starting end of the second blade and the center of the impeller forms a first line segment, the starting end of the first blade adjacent to the concave surface of the second blade and the center of the impeller form a second line segment, a third line segment is formed by a connecting line of the center of the balance hole and the center of the impeller, the first blade comprises a first side surface, the first side surface is a concave surface, a fourth line segment is formed by a connecting line of the impeller center and an intersection point of the second circumference and the first side surface of the first blade close to the balance hole, the included angle between the first line segment and the fourth line segment is a first included angle, the included angle between the third line segment and the second line segment is a second included angle, and the second included angle is smaller than the first included angle.
2. The electronic pump of claim 1, wherein: the number of the balance holes is larger than or equal to two, the total flow area of the balance holes is equal to the sum of the flow areas of the balance holes, an annular gap is formed between the outer edge of the impeller and the shell, an annular flow cross-sectional area is formed in the annular gap, and the total flow area of the balance holes is larger than or equal to the annular flow cross-sectional area.
3. The electronic pump of claim 1, wherein: the number of the balance holes is more than or equal to two, the total flow area of the balance holes is equal to the sum of the flow areas of all the balance holes, and the total flow area of the balance holes is more than or equal to 3mm2Less than or equal to 18mm2。
4. The electronic pump of claim 3, wherein the pump body comprises a cylindrical body having a cylindrical shapeThe method comprises the following steps: the blades comprise four first blades and four second blades, the impeller comprises four balance holes, the balance holes are arranged between the adjacent first blades, the flow cross section of each balance hole is approximately circular, and the flow area of each balance hole is larger than or equal to 1.7mm2Less than or equal to 3.2mm2。
5. The electronic pump according to any one of claims 1 to 4, wherein: first blade with the upper cover plate is integrative fixed, the apron is provided with the mounting groove down, the mounting groove with first blade corresponds the setting, the balancing hole sets up adjacent between the mounting groove, with the concave side distance of a mounting groove that the balancing hole is closer to the distance more than or equal to 1mm of the outward flange in balancing hole.
6. The electronic pump according to any one of claims 1 to 4, wherein: the limiting part comprises a first limiting part and a second limiting part, the first limiting part limits the rotor assembly to move along the direction of the pump shaft far away from the pump shaft fixing part, the second limiting part limits the rotor assembly to move along the direction of the pump shaft towards the pump shaft fixing part, the first limiting part is fixedly arranged with the free end of the pump shaft, and the second limiting part is fixedly arranged with the pump shaft fixing part; the first limiting part is arranged close to the free end relative to the second limiting part.
7. The electronic pump of claim 5, wherein: the limiting part comprises a first limiting part and a second limiting part, the first limiting part limits the rotor assembly to move along the direction of the pump shaft far away from the pump shaft fixing part, the second limiting part limits the rotor assembly to move along the direction of the pump shaft towards the pump shaft fixing part, the first limiting part is fixedly arranged with the free end of the pump shaft, and the second limiting part is fixedly arranged with the pump shaft fixing part; the first limiting part is arranged close to the free end relative to the second limiting part.
8. The electronic pump of claim 6, wherein: the first limiting part comprises a screw and a limiting element, the screw is connected with the pump shaft, the screw and the free end press and fix the limiting element, and the limiting element is located between the plane part of the screw and the end part of the free end.
9. The electronic pump of claim 7, wherein: the first limiting part comprises a screw and a limiting element, the screw is connected with the pump shaft, the screw and the free end press and fix the limiting element, and the limiting element is located between the plane part of the screw and the end part of the free end.
10. The electronic pump according to claim 8 or 9, wherein: the limiting element comprises an upper end face and a lower end face, the upper end face is in contact with the screw, the lower end face is in contact with the free end, and at least the surface roughness of the lower end face of the limiting element is smaller than 1.6.
11. The electronic pump of claim 10, wherein: the limiting element comprises a coating, at least the lower end face of the limiting element is coated with the coating, and the coating is made of diamond-like carbon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610658710.2A CN107725392B (en) | 2016-08-11 | 2016-08-11 | Electronic pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610658710.2A CN107725392B (en) | 2016-08-11 | 2016-08-11 | Electronic pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107725392A CN107725392A (en) | 2018-02-23 |
| CN107725392B true CN107725392B (en) | 2020-10-27 |
Family
ID=61200558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610658710.2A Active CN107725392B (en) | 2016-08-11 | 2016-08-11 | Electronic pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107725392B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4890980A (en) * | 1988-08-08 | 1990-01-02 | Ingersoll-Rand Company | Centrifugal pump |
| US6676366B2 (en) * | 2002-03-05 | 2004-01-13 | Baker Hughes Incorporated | Submersible pump impeller design for lifting gaseous fluid |
| CN101865157A (en) * | 2010-06-11 | 2010-10-20 | 中国兵器工业集团第七O研究所 | Centrifugal water pump |
| CN101985942A (en) * | 2010-11-18 | 2011-03-16 | 姜堰市德华船用泵业制造有限公司 | Tangent pump for ships |
| CN103573693A (en) * | 2013-11-12 | 2014-02-12 | 成都科盛石油科技有限公司 | Low-specific-speed centrifugal pump impeller |
| CN105443447A (en) * | 2014-09-24 | 2016-03-30 | 杭州三花研究院有限公司 | Electronic pump |
-
2016
- 2016-08-11 CN CN201610658710.2A patent/CN107725392B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4890980A (en) * | 1988-08-08 | 1990-01-02 | Ingersoll-Rand Company | Centrifugal pump |
| US6676366B2 (en) * | 2002-03-05 | 2004-01-13 | Baker Hughes Incorporated | Submersible pump impeller design for lifting gaseous fluid |
| CN101865157A (en) * | 2010-06-11 | 2010-10-20 | 中国兵器工业集团第七O研究所 | Centrifugal water pump |
| CN101985942A (en) * | 2010-11-18 | 2011-03-16 | 姜堰市德华船用泵业制造有限公司 | Tangent pump for ships |
| CN103573693A (en) * | 2013-11-12 | 2014-02-12 | 成都科盛石油科技有限公司 | Low-specific-speed centrifugal pump impeller |
| CN105443447A (en) * | 2014-09-24 | 2016-03-30 | 杭州三花研究院有限公司 | Electronic pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107725392A (en) | 2018-02-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10451074B2 (en) | Electric pump | |
| CN106286378B (en) | Centrifugal pump | |
| CN111306071B (en) | Rotor assembly and electronic pump | |
| EP3618240B1 (en) | Fan motor and manufacturing method therefor | |
| EP3613996B1 (en) | Fan motor and manufacturing method of the same | |
| CN107725392B (en) | Electronic pump | |
| EP3150859B1 (en) | Electric pump | |
| CN106481596B (en) | Electrically driven pump | |
| CN105443397A (en) | Electronic pump | |
| CN107181334B (en) | Fan stator and fan thereof | |
| CN209604274U (en) | A kind of electronic water pump for automobile | |
| CN220081738U (en) | Impeller and pump housing sealing assembly and pump unit with same | |
| CN205089683U (en) | Impeller, rotor subassembly, centrifugal pump and electric drive pump | |
| CN213899146U (en) | Impeller of low-noise brushless electric fuel pump | |
| CN114001036B (en) | Miniature hydraulic suspension mechanical pump and assembly method thereof | |
| CN212959239U (en) | Noise reduction impeller, rotor assembly and centrifugal pump | |
| CN216617913U (en) | Electronic water pump | |
| KR102400236B1 (en) | Fan motor and Manufacturing method of the same | |
| CN115102312A (en) | Drainage motor rotor and drainage motor comprising same | |
| CN116950923A (en) | Impeller and pump housing sealing assembly and pump unit with same | |
| CN114033712A (en) | Electronic water pump, thermal management system and vehicle | |
| CN114704474A (en) | New forms of energy water pump of easily assembling | |
| JP2000274386A (en) | External driving type line pump | |
| CN112901527A (en) | Air bearing compressor | |
| CN109210009A (en) | A kind of pump housing drive end bearing bracket, the pump housing and magnetic drive pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |