CN110571954B - Annular flow passage structure between stator and rotor of shielded motor - Google Patents
Annular flow passage structure between stator and rotor of shielded motor Download PDFInfo
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- CN110571954B CN110571954B CN201910974890.9A CN201910974890A CN110571954B CN 110571954 B CN110571954 B CN 110571954B CN 201910974890 A CN201910974890 A CN 201910974890A CN 110571954 B CN110571954 B CN 110571954B
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- rotor
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- annular flow
- shielding sleeve
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention discloses an annular flow passage structure between a stator and a rotor of a shielded motor, which comprises a stator shielding sleeve, a rotor shielding sleeve and an annular flow passage between the stator shielding sleeve and the rotor shielding sleeve, wherein a flow guide convex rib is arranged on the inner cylindrical surface of the stator shielding sleeve and/or the outer cylindrical surface of the rotor shielding sleeve, and the section shape, the size, the number, the layout and the like of the flow guide convex rib can be arranged according to specific technical requirements and application environments. The annular flow passage structure between the stator and the rotor of the shield motor is beneficial to improving the working efficiency, the rotating speed and the power density of the shield motor on one hand, and can also reduce the probability of faults caused by overheating of the motor, vaporization of a cooling medium and the like on the other hand.
Description
Technical Field
The invention relates to the technical field of shielded motors, in particular to an annular flow passage structure between a stator and a rotor of a shielded motor.
Background
The fully-closed type canned motor pump without the dynamic seal (and the leakage risk caused by the dynamic seal) structure has unique due advantages in the fields of petrochemical industry, nuclear power, aerospace, refrigeration and the like, particularly when high-temperature, high-pressure, inflammable, explosive, corrosive or extremely toxic fluid media are conveyed.
A canned motor for a pump capable of transporting liquid containing particles, disclosed in patent document CN110043472A, the canned motor for a pump comprises a motor cavity, a pump cavity and a negative pressure suction device, wherein an output end of the motor cavity is connected with the pump cavity, the negative pressure suction device comprises a first negative pressure suction device and a second negative pressure suction device, and the first negative pressure suction device and the second negative pressure suction device are respectively installed at the top end and the bottom end of the pump cavity; the shielding motor further comprises a cooling device, and one end of the cooling device is connected with the motor cavity.
However, since the rotor structure (rotating shaft, bearing, etc.) of the canned motor is completely immersed in the fluid, the liquid abrasion loss caused by the rotation of the rotor in the fluid rapidly increases with the increase of the rotating speed, and particularly when the rotating speed of the motor is as high as 15,000rpm or more, the efficiency of the canned motor is greatly reduced due to the liquid abrasion loss, and the temperature of the motor is greatly increased. The method not only needs to add more cooling measures and structure weight, improves complexity and cost of use and maintenance, but also reduces working reliability of the shielding motor, and the rotating speed and power density of the shielding motor are difficult to further improve.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an annular flow channel structure between a stator and a rotor of a shield motor.
The invention provides an annular flow passage structure between a stator and a rotor of a shielded motor, which comprises a stator shielding sleeve, a rotor shielding sleeve and a flow guide convex rib;
the stator shielding sleeve and the rotor shielding sleeve are sleeved, matched and encircled from outside to inside to form an annular flow passage;
in a use state, the rotor shielding sleeve is completely immersed in a set fluid, namely the annular flow passage is filled with the set fluid in the use state;
the flow guide convex ribs are arranged in the annular flow channel;
preferably, the guide ribs comprise rotor guide ribs and stator guide ribs; the rotor guide convex ribs and the stator guide convex ribs are respectively arranged on the rotor side and the stator side of the annular flow channel;
preferably, the rotor guide ribs and the stator guide ribs are respectively arranged on the rotor shielding sleeve and the stator shielding sleeve;
preferably, the guide ribs are only arranged outside the rotor shielding sleeve.
Preferably, the guide ribs are only arranged on the inner side of the stator shielding sleeve;
preferably, the cross-sectional shape of the guide ribs is any one or any combination of a semicircular cross section, a rectangular cross section, a trapezoidal cross section and a triangular cross section;
preferably, the length value of the guide ribs in the radial direction of the annular flow passage is R1, the length value of the radial gap at the corresponding position of the annular flow passage is R2, and the value range of R1 is 60-80% of R2;
preferably, the length value of the guide ribs in the axial direction of the annular flow passage is L1, and the length value of the radial clearance at the corresponding position of the annular flow passage is R2, so that the value range of L1 is 1 to 5 times that of R2;
preferably, if the flow area of the annular flow passage provided with the guide ribs in the axial direction is S1 and the flow area of the annular flow passage not provided with the guide ribs in the axial direction is S2, S1 is not less than 80% of S2.
The invention provides an annular flow passage structure between a stator and a rotor of a shielded motor, which comprises a stator shielding sleeve, a rotor shielding sleeve and a flow guide convex rib;
the stator shielding sleeve and the rotor shielding sleeve are sleeved, matched and encircled from outside to inside to form an annular flow passage;
in a use state, the rotor shielding sleeve is completely immersed in a set fluid, namely the annular flow passage is filled with the set fluid in the use state;
the flow guide convex ribs are arranged in the annular flow channel;
the guide convex ribs comprise rotor guide convex ribs and stator guide convex ribs; the rotor guide convex ribs and the stator guide convex ribs are respectively arranged on the rotor side and the stator side of the annular flow channel; wherein:
the rotor guide ribs and the stator guide ribs are respectively arranged on the rotor shielding sleeve and the stator shielding sleeve;
the guide ribs are arranged only on one of the outside of the rotor shielding sleeve or the inside of the stator shielding sleeve;
the cross section of the flow guide convex rib is any one or combination of a semicircular cross section, a rectangular cross section, a trapezoidal cross section and a triangular cross section;
the length value of the guide convex ribs in the radial direction of the annular flow passage is R1, the length value of the radial gap at the corresponding position of the annular flow passage is R2, and the value range of R1 is 60-80% of R2;
the length value of the guide convex ribs in the axial direction of the annular flow passage is L1, the length value of the radial clearance at the corresponding position of the annular flow passage is R2, and the value range of L1 is 1-5 times of that of R2;
if the axial flow area of the annular flow passage provided with the guide ribs is S1 and the axial flow area of the annular flow passage not provided with the guide ribs is S2, S1 is not less than 80% of S2.
The invention has the beneficial effects that:
according to the annular flow passage structure between the stator and the rotor of the shielding motor, the flow state of fluid in the annular flow passage can be changed through the arrangement of the guide ribs, the liquid friction loss is reduced by reducing the relative circumferential speed between the fluid in the annular flow passage and the rotor, and the cooling heat exchange performance is improved by increasing the axial speed of the fluid in the annular flow passage. Compared with the prior art, the annular flow passage structure between the stator and the rotor of the shielding motor is beneficial to reducing the liquid film loss of the shielding motor and improving the working efficiency of the motor, so that the rotating speed and the power density of the motor can be further improved; on the other hand, the cooling performance of the shielding motor is improved, and the probability of motor faults caused by motor overheating and cooling medium vaporization caused by the motor overheating is reduced.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic cross-sectional view of an annular flow passage structure between a stator and a rotor of a canned motor according to an embodiment of the present invention.
Fig. 2 is an expanded view of an inner cylindrical surface of a stator shielding sleeve and an outer cylindrical surface of a rotor shielding sleeve of the annular flow path structure between the stator and the rotor of the canned motor according to the first embodiment of the present invention.
Fig. 3 is a schematic cross-sectional view of an annular flow passage structure between a stator and a rotor of a canned motor according to a second embodiment of the present invention.
Fig. 4 is an expanded view of an inner cylindrical surface of a stator shielding sleeve and an outer cylindrical surface of a rotor shielding sleeve of the annular flow path structure between the stator and the rotor of the canned motor according to the second embodiment of the present invention.
| Rotor guide rib 1 |
| |
| |
| |
| Annular flow passage 5 |
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The invention provides an annular flow passage structure between a stator and a rotor of a shielded motor, which comprises a stator shielding sleeve 3, a rotor shielding sleeve 4 and a flow guide convex rib; the stator shielding sleeve 3 and the rotor shielding sleeve 4 are sleeved, matched and encircled from outside to inside to form an annular flow passage 5; in a use state, the rotor shielding sleeve 4 is completely immersed in the set fluid, namely the annular flow channel 5 is filled with the set fluid in the use state; the flow guide convex ribs are arranged in the annular flow passage 5; the guide convex ribs comprise rotor guide convex ribs 1 and stator guide convex ribs 2; the rotor guide convex ribs 1 and the stator guide convex ribs 2 are respectively arranged on the rotor shielding sleeve 4 side and the stator shielding sleeve 3 side of the annular flow passage 5; wherein:
the rotor guide ribs 1 and the stator guide ribs 2 are respectively arranged on the rotor shielding sleeve 4 and the stator shielding sleeve 3;
or
The guide ribs are arranged only on one of the outside of the rotor shielding sleeve 4 and the inside of the stator shielding sleeve 3;
specifically, the cross-sectional shape of the guide ribs is any one or any combination of a semicircular cross section, a rectangular cross section, a trapezoidal cross section and a triangular cross section; the length value of the guide convex ribs in the radial direction of the annular flow passage 5 is R1, the length value of the radial clearance at the corresponding position of the annular flow passage 5 is R2, and the value range of R1 is 60-80% of R2; the length value of the guide convex ribs in the axial direction of the annular flow passage 5 is L1, the length value of the radial clearance at the corresponding position of the annular flow passage 5 is R2, and the value range of L1 is 1 to 5 times of that of R2; if the axial flow area of the annular flow passage 5 provided with the guide ribs is S1 and the axial flow area of the annular flow passage 5 not provided with the guide ribs is S2, S1 is not less than 80% of S2.
Furthermore, the annular flow passage structure between the stator and the rotor of the shield motor in the preferred embodiment of the invention can reduce the relative circumferential speed between the fluid in the annular flow passage and the rotor and increase the axial speed of the fluid in the annular flow passage. The structural scheme is beneficial to improving the working efficiency of the shielding motor, and further achieves the purposes of energy conservation and speed increase.
The invention provides an annular flow passage structure between a stator and a rotor of a shielded motor, which comprises a stator shielding sleeve, a rotor shielding sleeve and an annular flow passage between the stator shielding sleeve and the rotor shielding sleeve, wherein a flow guide convex rib is arranged on the inner cylindrical surface of the stator shielding sleeve and/or the outer cylindrical surface of the rotor shielding sleeve, the cross section shape, the size, the number, the layout and the like of the flow guide convex rib can be set according to specific technical requirements and application occasions, and the specific description is as follows:
the cross section of the flow guide convex rib can be in different cross section shapes such as a semicircular cross section, a rectangular cross section, a trapezoidal cross section, a triangular cross section and the like;
the height of the guide convex ribs is generally 60 to 80 percent of the height of the annular gap between the stator and the rotor;
the length of the flow guide convex rib is generally 1 to 5 times of the height of the annular gap between the stator and the rotor;
the layout of the diversion convex ribs can be arranged on the inner cylindrical surface of the stator shielding sleeve in a segmented mode, or the outer cylindrical surface of the rotor shielding sleeve in a segmented mode, or both the stator shielding sleeve and the rotor shielding sleeve in a simultaneous mode, and the axial flow area of the stator-rotor annular gap after the diversion convex ribs are arranged is generally not less than 80% of that of the stator-rotor annular gap without the diversion convex ribs;
the number of the flow guide convex ribs can be increased as much as possible on the premise of meeting the requirements;
the first embodiment is as follows:
fig. 1 to fig. 2 are schematic cross-sectional views and expanded structural diagrams of an annular flow channel structure between a stator and a rotor of a canned motor according to an embodiment of the present invention. As shown in fig. 1 to 2, the annular flow passage structure between the stator and the rotor of the canned motor provided by the present invention includes: the stator shielding sleeve (generally made of metal material) 3 with discontinuous guide ribs 2 on the inner cylindrical surface, the rotor shielding sleeve (generally made of metal material) 4 with discontinuous guide ribs 1 on the outer cylindrical surface, and an annular flow channel 5 between the stator shielding sleeve and the rotor shielding sleeve.
In fig. 1, the fluid flows from top to bottom perpendicular to the paper, and the rotor rotates clockwise; in fig. 2 the fluid flows from top to bottom along the paper and the rotor rotates from left to right along the paper.
Example two:
fig. 3 to 4 are schematic cross-sectional views and expanded structural diagrams of an annular flow channel structure between a stator and a rotor of a canned motor according to a second embodiment of the present invention. As shown in fig. 3 to 4, the annular flow passage structure between the stator and the rotor of the canned motor provided by the present invention includes: the stator shielding sleeve 3 with continuous guide ribs 2 on the inner cylindrical surface, the rotor shielding sleeve 4 without guide ribs on the outer cylindrical surface and the annular flow passage 5 between the stator shielding sleeve and the rotor shielding sleeve.
In FIG. 3, the fluid flows from top to bottom perpendicular to the page, and the rotor rotates clockwise; in fig. 4 the fluid flows from top to bottom along the paper and the rotor rotates from left to right along the paper.
In other embodiments of the present invention, the operation of the valve may be further varied according to specific technical requirements and applications, the cross section types (such as symmetrical type, asymmetrical type and the like) of the rotor guide convex ribs 1 and the stator guide convex ribs 2, the cross section shapes (such as semicircular shape, parabolic shape and the like), the convex rib lengths and the distribution thereof (such as equal length, unequal length and the like of which the lengths are changed according to a certain rule), the convex rib widths and the distribution thereof (such as equal width, unequal width and the like of which the widths are changed according to a certain rule), the convex rib heights and the distribution thereof (such as equal height, unequal height and the like of which the heights are changed according to a certain rule), the convex rib quantity, the distribution positions (such as a cylindrical surface fluid inlet section, a fluid outlet section, a middle section or other specified positions and the like), the layout (such as uniform distribution, random distribution, interval uniform distribution, distribution density and the like), the line type (such as spiral line.
According to the annular flow passage structure between the stator and the rotor of the shielding motor, the flow state of fluid in the annular flow passage 5 can be changed by arranging the rotor guide ribs 1 and the stator guide ribs 2, the liquid friction loss is reduced by reducing the relative circumferential speed between the fluid and the rotor in the annular flow passage 5, and the cooling heat exchange performance is improved by increasing the axial speed of the fluid in the annular flow passage 5. The annular flow passage structure between the stator and the rotor of the shielding motor is beneficial to reducing the liquid film loss of the shielding motor and improving the working efficiency of the motor, so that the rotating speed and the power density of the motor can be further improved; on the other hand, the cooling performance of the shielding motor is improved, and the probability of motor faults caused by motor overheating and cooling medium vaporization caused by the motor overheating is reduced.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (1)
1. An annular flow passage structure between a stator and a rotor of a shielded motor is characterized by comprising a stator shielding sleeve (3), a rotor shielding sleeve (4) and a flow guide convex rib;
the stator shielding sleeve (3) and the rotor shielding sleeve (4) are sleeved, matched and encircled from outside to inside to form an annular flow passage (5);
in a use state, the rotor shielding sleeve (4) is completely immersed in a set fluid, namely the annular flow channel (5) is filled with the set fluid in the use state;
the flow guide convex ribs are arranged in the annular flow channel (5);
the flow guide convex ribs comprise rotor flow guide convex ribs (1) and stator flow guide convex ribs (2); the rotor guide convex ribs (1) and the stator guide convex ribs (2) are respectively arranged on the rotor shielding sleeve (4) side and the stator shielding sleeve (3) side of the annular flow passage (5); wherein:
-the rotor guide ribs (1) and the stator guide ribs (2) are respectively arranged on the rotor shielding sleeve (4) and the stator shielding sleeve (3); or
-the guide ribs are arranged only one of outside the rotor shield (4) or inside the stator shield (3);
the cross section of the flow guide convex rib is any one or combination of a semicircular cross section, a rectangular cross section, a trapezoidal cross section and a triangular cross section;
the length value of the guide convex ribs in the radial direction of the annular flow passage (5) is R1, the length value of the radial clearance at the corresponding position of the annular flow passage (5) is R2, and the value range of R1 is 60-80% of R2;
the length value of the guide convex ribs in the axial direction of the annular flow passage (5) is L1, the length value of the radial clearance at the corresponding position of the annular flow passage (5) is R2, and the value range of L1 is 1-5 times of that of R2;
and (3) setting the axial flow area of the annular flow passage (5) provided with the flow guide ribs to be S1, and setting the axial flow area of the annular flow passage (5) not provided with the flow guide ribs to be S2, wherein S1 is not less than 80 percent of S2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910974890.9A CN110571954B (en) | 2019-10-14 | 2019-10-14 | Annular flow passage structure between stator and rotor of shielded motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910974890.9A CN110571954B (en) | 2019-10-14 | 2019-10-14 | Annular flow passage structure between stator and rotor of shielded motor |
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| Publication Number | Publication Date |
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| CN110571954A CN110571954A (en) | 2019-12-13 |
| CN110571954B true CN110571954B (en) | 2021-03-16 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114922821B (en) * | 2022-06-09 | 2024-01-05 | 浙江理工大学 | Anti-blocking shielding pump and control method thereof |
| CN115158622B (en) * | 2022-06-15 | 2023-05-23 | 中国船舶重工集团公司第七一九研究所 | Integrated motor propulsion device suitable for complex water area |
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| JP2006067729A (en) * | 2004-08-27 | 2006-03-09 | Aisin Seiki Co Ltd | Electric pump |
| CN102927015A (en) * | 2012-11-05 | 2013-02-13 | 安徽松久电机电器有限公司 | Cooling shield electric pump for converter |
| CN105464996A (en) * | 2014-08-15 | 2016-04-06 | 德昌电机(深圳)有限公司 | Electric liquid pump |
| CN106208487A (en) * | 2016-07-12 | 2016-12-07 | 合肥新沪屏蔽泵有限公司 | A kind of motor for shielded electric pump |
| CN107769420A (en) * | 2017-11-10 | 2018-03-06 | 中国矿业大学 | A kind of protected type switched reluctance machines and low-loss control method |
| CN108808950A (en) * | 2018-07-31 | 2018-11-13 | 浙江浙水工贸有限公司 | Protected type permanent magnetism high speed motor for submerged pump |
| CN109950986A (en) * | 2017-12-21 | 2019-06-28 | 北京有色金属研究总院 | A method for improving the stability of the stator shielding sleeve of a shielded motor |
-
2019
- 2019-10-14 CN CN201910974890.9A patent/CN110571954B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006067729A (en) * | 2004-08-27 | 2006-03-09 | Aisin Seiki Co Ltd | Electric pump |
| CN102927015A (en) * | 2012-11-05 | 2013-02-13 | 安徽松久电机电器有限公司 | Cooling shield electric pump for converter |
| CN105464996A (en) * | 2014-08-15 | 2016-04-06 | 德昌电机(深圳)有限公司 | Electric liquid pump |
| CN106208487A (en) * | 2016-07-12 | 2016-12-07 | 合肥新沪屏蔽泵有限公司 | A kind of motor for shielded electric pump |
| CN107769420A (en) * | 2017-11-10 | 2018-03-06 | 中国矿业大学 | A kind of protected type switched reluctance machines and low-loss control method |
| CN109950986A (en) * | 2017-12-21 | 2019-06-28 | 北京有色金属研究总院 | A method for improving the stability of the stator shielding sleeve of a shielded motor |
| CN108808950A (en) * | 2018-07-31 | 2018-11-13 | 浙江浙水工贸有限公司 | Protected type permanent magnetism high speed motor for submerged pump |
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