CN115514119B - Porous stator structure in supercritical carbon dioxide power generation system - Google Patents
Porous stator structure in supercritical carbon dioxide power generation system Download PDFInfo
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- CN115514119B CN115514119B CN202211279642.0A CN202211279642A CN115514119B CN 115514119 B CN115514119 B CN 115514119B CN 202211279642 A CN202211279642 A CN 202211279642A CN 115514119 B CN115514119 B CN 115514119B
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- hole
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- stator
- stator body
- air inlet
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000010248 power generation Methods 0.000 title claims abstract description 24
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 22
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 22
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 230000004323 axial length Effects 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 230000001154 acute effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000020169 heat generation Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000005284 excitation Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- 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
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
-
- 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
Abstract
The invention discloses a hole-shaped stator structure in a supercritical carbon dioxide power generation system, which comprises a stator body, wherein a plurality of air inlet structures are arranged on the stator body in a penetrating way, and the air outlet direction of each air inlet structure is the same as the rotating direction of a rotor; a plurality of hole slots are also formed in the stator body, and the hole slots are positioned at the downstream of the air inlet structure. The hole-shaped stator structure introduces positive inclined circumferential airflow in the same rotation direction as the rotor through the air inlet structure, so that circumferential speed gradient near the rotor surface in the motor cavity is reduced, and rotor wind friction loss coefficient and rotor wind friction loss are further reduced. The hole-shaped stator structure is introduced into the hole groove at the downstream of the air inlet structure to reduce the average circumferential speed of the airflow in the motor cavity and inhibit the airflow exciting force in the motor cavity so as to avoid the airflow exciting instability phenomenon caused by positive inclined airflow, thereby effectively realizing the purposes of low wind friction loss of the motor rotor and safe and stable operation of the motor rotor.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a hole-shaped stator structure in a supercritical carbon dioxide power generation system.
Background
The method is an important means for solving the problem that the temperature of a part is increased and the service life is reduced under the working condition of high heat load of a motor in the supercritical carbon dioxide power generation system; however, the introduction of external air flow can cause the friction and heat generation of the motor rotor and the flowing working medium, so that excessive wind friction loss is generated. Research shows that the wind friction loss is directly proportional to the wind friction coefficient, the working medium density, the third power of the rotor rotating speed, the fourth power of the rotor radius and the length of the cavity, and the wind friction loss coefficient is related to the circumferential speed gradient near the inner rotor surface of the motor cavity, and the larger the circumferential speed gradient of the airflow is, the more serious the wind friction loss of the rotor is. The inherent characteristics of high-speed and high-density fluid in the supercritical carbon dioxide power generation system can aggravate the loss of rotor wind of a motor so as to restrict the power generation of the unit at a load, so that the reduction of the loss of rotor wind friction by reducing the coefficient of rotor wind loss has very important significance in the supercritical carbon dioxide power generation system.
Disclosure of Invention
The invention aims to provide a hole-shaped stator structure in a supercritical carbon dioxide power generation system, which solves the problem of excessive wind friction loss caused by friction heat generation between a motor rotor and a flowing working medium.
The invention provides a hole-shaped stator structure in a supercritical carbon dioxide power generation system, which is characterized by comprising a stator body, wherein a plurality of air inlet structures are arranged on the stator body in a penetrating way, and the air outlet direction of each air inlet structure is the same as the rotating direction of a rotor; and the stator body is also provided with a plurality of hole slots, and the hole slots are positioned at the downstream of the air inlet structure.
By adopting the technical scheme, on one hand, the hole-shaped stator structure introduces positive inclined circumferential airflow with the same rotation direction as the rotor through the circumferential air inlet structure, so that circumferential speed gradient near the rotor surface in the motor cavity is reduced, and further rotor wind friction loss coefficient and rotor wind friction loss are reduced. On the other hand, the porous stator structure is introduced into the pore groove at the downstream of the circumferential air inlet structure to reduce the average circumferential speed of the airflow in the motor cavity and inhibit the airflow exciting force in the motor cavity so as to avoid the airflow exciting instability phenomenon of the motor rotor under the condition that the circumferential airflow with the same rotation direction as that of the rotor is introduced, effectively realize the purposes of low motor rotor wind friction loss and safe and stable operation of the motor rotor, and provide effective guarantee for full load output and long-term reliable operation of the supercritical carbon dioxide Brayton cycle power generation system, and have very important engineering significance.
As a possible preferred design, several of the air intake structures are distributed along the circumference of the stator body; preferably, the plurality of air inlet structures are uniformly distributed along the circumferential direction of the stator body; preferably, a plurality of the air inlet structures are distributed in at least one ring; preferably, each of the air intake structures is adjacent to one end of the stator body.
As a possible preferred design, an included angle between the air outlet direction of each air inlet structure and the radial direction of the stator body is an acute angle.
As a possible preferred design, the air intake structure is a pipe, one end of which penetrates the stator body.
As a possible preferred design, a number of the holes are distributed along the circumference of the stator body; preferably, the plurality of holes and grooves are distributed in at least one ring, and the central axis of each ring coincides with the central axis of the stator body.
As a possible preferred design, the number of slots is divided into circumferential 6-36 groups, the number of slots in each group being distributed in a line parallel to the central axis of the stator body.
As a possible preferred design, any two adjacent groups of the holes and grooves are arranged in parallel.
As a possible preferred design, any two adjacent groups of slots are located on the same section of the stator body in the radial direction.
As a possible preferred design, the axial length of the region of the slot does not exceed 1/3 of the axial length of the stator body.
As a possible preferred design, the cross-sectional shape of the end of each of the hole grooves facing the rotor is circular, elliptical or hexagonal, and the major axis of the ellipse is disposed in parallel with the central axis of the stator body.
Drawings
Fig. 1 is a three-dimensional simplified structural diagram of a rotor-stator in a motor in the present embodiment;
FIG. 2 is a three-dimensional view of the hole-shaped stator structure in the present embodiment;
fig. 3 is a circumferential cross-sectional view of a circumferential air intake section of the hole-shaped stator structure in the present embodiment.
Wherein, 1-is a rotor structure; 2-stator structure; 3-an air intake structure; 4-the air outlet direction of the air inlet structure; 5-radial direction; 6-an included angle between the central axis of the air inlet structure and the radial direction; 7-a hole groove; 8-the regional axial length of the hole slot; 9-axial length of the stator body; 10-stator body.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. The meaning of "a number" is one or more than one unless specifically defined otherwise.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The supercritical carbon dioxide power generation system usually adopts an external cooling air flow to ventilate and cool the inside of the generator, and the method is an important means for solving the problem that the temperature of a part is increased and the service life is reduced under the working condition of high heat load of the generator in the supercritical carbon dioxide power generation system; however, the introduction of external air flow can cause friction heat generation between the motor rotor and the flowing working medium, so that wind friction loss is generated.
In order to solve the above problems, the inventors of the present invention found that the cause of the above problems is mainly: the wind friction loss is directly proportional to the wind friction coefficient, the working medium density, the third power of the rotor rotating speed, the fourth power of the rotor radius and the length of the cavity, and the wind friction loss coefficient is related to the circumferential speed gradient near the inner rotor surface of the motor cavity, and the larger the circumferential speed gradient of the airflow is, the more serious the wind friction loss of the rotor is. The characteristic of high-rotation speed and high-density fluid in the supercritical carbon dioxide power generation system can aggravate the loss of wind friction of a motor rotor, so that the unit is restricted to generate power at a load.
Based on the above reasons for causing wind loss, the inventors of the present invention introduced a circumferential air flow to reduce the circumferential velocity gradient near the inner rotor face of the motor chamber, thereby reducing the rotor wind loss coefficient and rotor wind loss.
As used herein, the term "wind friction loss" refers to the lost work generated by frictional heat generation between the airflow and the rotor.
As shown in fig. 1, a three-dimensional structure of a rotor-stator in the motor according to the present embodiment is shown. When external air flow is introduced into the area between the rotor structure 1 and the stator structure 2, heat generated in the rotation process of the rotor is taken away, but the inherent characteristics of high rotating speed and high density of the carbon dioxide power generation system cause excessive loss of rotor wind so as to influence the output efficiency and output work of the power generation system.
As shown in fig. 2, the present embodiment provides a hole-shaped stator structure in a supercritical carbon dioxide power generation system. As shown in fig. 2, the hole-shaped stator structure 2 in the supercritical carbon dioxide power generation system comprises a stator body 10, wherein a plurality of air inlet structures 3 are arranged on the stator body 10 in a penetrating manner, and the air outlet direction 4 of each air inlet structure is the same as the rotation direction of the rotor.
In this embodiment, as shown in fig. 2, by providing the air intake structure 3 and making the air outlet direction 4 of the air intake structure the same as the rotation direction of the rotor, the circumferential speed gradient near the inner rotor surface of the motor chamber is reduced, and the rotor wind friction loss coefficient and the rotor wind friction loss are further reduced.
In this embodiment, although the introduction of the air flow in the same direction as the rotation direction of the rotor can reduce the wind friction loss of the rotor, the average circumferential speed of the air flow in the chamber is increased to generate an excessive rotor airflow exciting force, and even the instability of the rotor is possibly induced, so as to be shown in fig. 2, a plurality of hole slots 7 are formed in the stator body 10, and the hole slots 7 are located at the downstream of the air inlet structure 3, so that the circumferential movement of the air flow when passing through the hole slots 7 is inhibited, and the average circumferential speed of the air flow in the motor chamber is reduced to inhibit the airflow exciting force in the motor chamber, thereby effectively achieving the purpose of safe and stable operation with low wind friction loss of the rotor.
In this embodiment, specific distribution positions of the plurality of air intake structures 3 are not particularly limited, and may be distributed on the stator body 10 in a dispersive manner, or may be distributed in a centralized manner, or may be distributed on the stator body 10 in various shapes.
In the present embodiment, there is no particular requirement on the specific structure of the air intake structure 3, as long as the direction of the air flow velocity entering the stator body 10 is circumferential and the same as the rotation method of the rotor is satisfied.
In this embodiment, the number and inner diameter of the air intake structure 3 are set to match rotor wind loss and rotor stability. When the flow rate of the cooling air flow is fixed, the inner diameter of the air inlet structure 3 can be reduced, the circumferential number of the air inlet structure 3 is increased to enhance the positive inclined jet flow effect of the air flow so as to fully inhibit rotor wind friction loss, however, the too strong positive inclined jet flow easily causes rotor air flow excitation instability, and at the moment, the circumferential number of the downstream hole slots 7 needs to be increased so as to enhance rotor stability and avoid rotor instability.
In a possible embodiment of the slot, as shown in fig. 2, a plurality of air inlet structures 3 are distributed along the circumference of the stator body 10, so that the air flow can enter as uniformly as possible along the circumference of the stator body 10, and the air flow stability is better.
In a possible embodiment, as shown in fig. 2, a plurality of the air inlet structures 3 are uniformly distributed along the circumferential direction of the stator body 10, so that the air flow distribution is more uniform.
In a possible embodiment, as shown in fig. 2, several air inlet structures 3 are distributed in at least one ring, so that the circumferential air flow velocity is more stable.
In a possible embodiment of the slot, as shown in fig. 2, each of the air intake structures 3 is close to one end of the stator body 10.
In a possible embodiment, as shown in fig. 2, in order to save costs, the air intake structure 3 may be a duct, which is inclined so as to satisfy the same direction of the incoming air flow as the rotation direction of the rotor. The pipe needs to meet high temperature resistance, such as steel pipe.
In a possible embodiment, the air outlet direction 4 of each air inlet structure forms an acute angle with the radial direction 5 of the stator body 10, so as to ensure that the deviation between the air flow direction entering the stator body 10 and the rotation direction of the rotor is small, thereby effectively reducing the wind loss coefficient.
In this embodiment, the number and size of the holes 7 are set to match rotor stability and rotor wind loss determination. Although the hole slots can effectively reduce the airflow exciting force, and the effect is better as the circumferential groups of the hole slots are more, the excessive hole slot groups can cause the increase of the wind friction loss of the hole slot sections so as to offset the effect of reducing the wind friction loss of the rotor partially and wholly, so that the optimal circumferential groups and diameter of the hole slots can be obtained by calculating the rotor loss work under the condition through the fluid dynamics calculation software.
In a possible embodiment, as shown in fig. 2, a plurality of the holes 7 are distributed along the circumference of the stator body 10, so as to reduce the average circumferential speed of the airflow in the motor cavity as much as possible, thereby inhibiting the airflow exciting force in the motor cavity.
In a possible embodiment, as shown in fig. 2, the plurality of holes 7 are distributed in at least one ring, and the central axis of each ring coincides with the central axis of the stator body 10; in order to uniformly reduce the average circumferential speed of airflow at all parts in the circumferential direction in the motor cavity.
In a possible embodiment, as shown in fig. 2, the plurality of slots 7 are divided into groups 6-36 in the circumferential direction, the plurality of slots 7 in each group being distributed in a line parallel to the central axis of the stator body 10. The comprehensive indexes of the average circumferential velocity of the air flow and the wind friction loss of the rotor in the range are better, and the simple fitting relation between the circumferential group number of the hole slots and the inclination angle of the air inlet structure is as follows:
n＝θ/3+6
wherein n is the number of circumferential groups of the hole slots; θ is the inclination angle of the air intake structure 3.
In a possible embodiment, as shown in fig. 2, any two adjacent sets of the hole grooves 7 are arranged in parallel. As shown in fig. 2, any two adjacent groups of slots 7 are located on a section of the same stator body 10 in the radial direction 5.
In a possible implementation manner, the axial length 8 of the region of the hole slot is not more than 1/3 of the axial length 9 of the stator body, so as to avoid excessive loss of wind friction of the rotor of the hole slot section and ensure effective reduction of wind friction loss. In fact, the longer the axial length of the area of the hole slot is, the better the effects of reducing the average circumferential speed of the airflow and suppressing the vibration of the airflow of the rotor are, however, the longer the hole slot 7 is arranged, the larger the loss of the airflow rotor is, and the meaning of controlling the loss of the rotor is lost.
In this embodiment, the cross section of the end of the slot 7 facing the rotor is required to be circular, elliptical or hexagonal, and the major axis of the ellipse should be parallel to the central axis of the stator body 10, so as to better block the circumferential movement of the air flow, thereby reducing the average circumferential speed of the air flow, and reducing the excitation of the air flow, so as to enhance the stability of the rotor.
Example
The technical scheme of the example is as follows: the porous stator structure 2 in the supercritical carbon dioxide power generation system comprises a stator body 10, wherein a plurality of air inlet structures 3 are arranged on the stator body 10 in a penetrating manner, and the air outlet direction 4 of each air inlet structure is the same as the rotating direction of a rotor; the stator body 10 is further provided with a plurality of holes 7, and the holes 7 are located at the downstream of the air inlet structure 3. The air inlet structures 3 are distributed in a ring; each of the air intake structures 3 is close to one end of the stator body 10. The included angle between the air outlet direction 4 of each air inlet structure and the radial direction 5 of the stator body 10 is an acute angle. The air inlet structure 3 is a pipe, and one end of the pipe penetrates through the stator body 10. The plurality of holes 7 are divided into 6-36 groups and distributed in at least one ring, the central axis of the ring coincides with the central axis of the stator body 10, the holes 7 in each group are distributed in a line parallel to the central axis of the stator body 10. Any two adjacent groups of the hole grooves 7 are arranged in parallel. Any two adjacent groups of holes 7 are located on the same section of the stator body 10 along the radial direction 5. The axial length of the region of the slot 7 does not exceed 1/3 of the axial length 9 of the stator body. The cross section of the end of each hole groove 7 facing the rotor is circular.
As shown in fig. 2 and 3, the present example discloses a hole-shaped stator structure 2 in a supercritical carbon dioxide power generation system, which comprises a stator body 10, 6 steel pipes are arranged on the stator body 10 in a penetrating manner, the 6 steel pipes are distributed in a ring shape, and the central axis of the ring coincides with the central axis of the stator body 10; the air outlet direction of each steel pipe is the same as the rotation direction of the rotor, and the included angle is an acute angle, namely not more than 90 degrees.
18 groups of holes 7 are formed in the stator body 10 along the circumferential direction of the stator body, the cross section of each hole 7 is circular, and all the holes 7 are positioned at the downstream of the steel pipe; the axial length of the region of the slot 7 does not exceed 1/3 of the axial length 9 of the stator body.
The working principle of this example is: the hole-shaped stator structure 2 in the supercritical carbon dioxide power generation system introduces positive inclined circumferential airflow in the same rotation direction as the rotor through the steel pipe, so that circumferential speed gradient near the rotor surface in the motor cavity is reduced, and further rotor wind friction loss coefficient and rotor wind friction loss are reduced. On the other hand, the porous stator structure 2 in the supercritical carbon dioxide power generation system introduces uniformly distributed porous grooves 7 at the downstream of the steel pipe to reduce the average circumferential speed of the airflow in the motor cavity and inhibit the airflow exciting force in the motor cavity, so that the phenomenon of airflow excitation instability of the motor rotor 1 under the condition of introducing the circumferential airflow in the same direction as the rotation direction of the rotor is avoided, and the aim of safe and stable operation under low rotor wind loss is effectively realized.
The structure disclosed by the invention is easy to implement and has good application prospect, provides effective guarantee for full-load output and long-term reliable operation of the supercritical carbon dioxide Brayton cycle power generation system, and has very important engineering significance.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The porous stator structure in the supercritical carbon dioxide power generation system is characterized by comprising a stator body (10), wherein a plurality of air inlet structures (3) are arranged on the stator body (10) in a penetrating manner, and the air outlet direction (4) of each air inlet structure is the same as the rotating direction of a rotor; a plurality of hole slots (7) are further formed in the stator body (10), and gas flows into the hole slots (7) through the gas inlet structure (3);
the axial length of the region of the hole slot (7) is not more than 1/3 of the axial length (9) of the stator body;
the plurality of hole slots (7) are divided into 6-36 groups in the circumferential direction, and the plurality of hole slots (7) in each group are distributed in a line which is parallel to the central axis of the stator body (10);
the fitting relation between the circumferential group number of the hole grooves and the inclination angle of the air inlet structure is as follows:
n＝θ/3+6
wherein n is the number of circumferential groups of the hole slots; θ is the tilt angle of the air intake structure (3), 0< tilt angle <90 °;
the inclination angle refers to an included angle between an air outlet direction (4) of each air inlet structure and a radial direction (5) of the stator body (10).
2. The hole stator structure according to claim 1, characterized in that several of the air inlet structures (3) are distributed along the circumference of the stator body (10).
3. The hole stator structure according to claim 2, characterized in that several of the air inlet structures (3) are evenly distributed along the circumference of the stator body (10).
4. The perforated stator structure according to claim 2, characterized in that several of the air inlet structures (3) are distributed in at least one ring.
5. The hole stator structure according to claim 2, characterized in that each of the air intake structures (3) is close to an axial end of the stator body (10).
6. The hole stator structure according to claim 1, characterized in that the air intake structure (3) is a rectilinear duct, one end of which extends through the stator body (10).
7. The hole stator structure according to claim 1, characterized in that a number of the hole slots (7) are distributed along the circumference of the stator body (10).
8. The hole stator structure according to claim 7, characterized in that a number of the hole slots (7) are distributed in at least one ring, the central axis of each ring coinciding with the central axis of the stator body (10).
9. The hole stator structure according to claim 1, characterized in that any adjacent two groups of the hole slots (7) are arranged in parallel.
10. The hole stator structure according to any one of claims 1-9, characterized in that the cross-sectional shape of the end of each hole slot (7) facing the rotor is circular, oval or hexagonal, and that the major axis of the oval is arranged parallel to the central axis of the stator body (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211279642.0A CN115514119B (en) | 2022-10-19 | 2022-10-19 | Porous stator structure in supercritical carbon dioxide power generation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211279642.0A CN115514119B (en) | 2022-10-19 | 2022-10-19 | Porous stator structure in supercritical carbon dioxide power generation system |
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| CN115514119A CN115514119A (en) | 2022-12-23 |
| CN115514119B true CN115514119B (en) | 2024-01-23 |
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| CN114060409A (en) * | 2020-07-29 | 2022-02-18 | 青岛海尔智能技术研发有限公司 | Gas bearing, compressor and air conditioning system |
| CN214013961U (en) * | 2020-12-31 | 2021-08-20 | 常州市科杰塑料套管有限公司 | Stator core convenient to dismouting |
| CN115173597A (en) * | 2022-07-19 | 2022-10-11 | 浙江大学 | Permanent magnet motor |
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| CN115514119A (en) | 2022-12-23 |
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