A compression expansion integrated high-speed motor unit cooling structure

Abstract

The embodiment of the application provides a compression expansion integrated high-speed motor unit cooling structure. The structure adopts a water cooling and forced air cooling combined cooling form, wherein the water cooling is used for cooling of a motor stator, a spiral cooling water channel is arranged in a motor stator outside shell; the forced air cooling is mainly used for cooling of a motor rotor and two side bearings, four groups of interfaces are reserved in a cooling air path, a parallel connection design is adopted, and the air volume of each interface can be adjusted to adjust the whole machine cooling. Four groups of air inlet and outlet air channels adopt a pre-buried type full-circumferential air distribution ring design, a communication path from the air distribution ring to a motor cavity / bearing cavity is circumferentially distributed, so that air inlet of the motor cavity is more uniform, and circumferential uniformity of a temperature field of each component is improved. The motor stator rotor and two side bearing cooling air paths adopt a parallel connection design, and the motor stator rotor and two end magnetic bearings are separately cooled, so that the influence of hot air after cooling of the motor stator rotor on bearing cooling can be minimized. The application can adjust the water inlet volume / air volume of each interface to adjust the whole machine temperature field, effectively improve air inlet uniformity of the motor cavity, optimize cooling and heat dissipation effect, and be suitable for a compressor, a turbine coaxial arrangement integrated high-speed motor unit.

Description

Technical Field

[0001] This application relates to the field of high-speed motor design technology, and in particular to a cooling structure for a high-speed motor unit with integrated compression and expansion. Background Technology

[0002] High-speed motors are widely used in industrial drives, transportation, and household appliances. While they can achieve high power output when the rotor rotates at high speeds, the high operating frequency and heavy load also increase internal copper losses, iron losses, and mechanical losses, resulting in a significant amount of heat generation. If the motor's cooling structure is inadequate or heat dissipation is insufficient, heat can easily accumulate inside the motor, leading to excessively high local temperatures. This can cause problems such as aging and failure of the winding insulation, demagnetization of permanent magnets, affecting motor performance and lifespan, and in severe cases, even causing motor damage.

[0003] The integrated compression-expansion high-speed generator set is a new type of generator set in which the compressor and turbine are coaxially arranged on both sides of the high-speed motor rotor. It has advantages such as compact structure, high energy density, and low vibration and noise, and is an important technical route in the design and research of supercritical carbon dioxide generator sets. In the integrated compression-expansion high-speed generator set, the temperature of the working fluid flowing through the turbine generally exceeds 400°C, which further worsens the heat dissipation conditions of the high-speed motor. Summary of the Invention

[0004] The purpose of this invention is to provide a cooling structure for a high-speed motor unit with integrated compression and expansion to solve the heat dissipation problem of such units.

[0005] This invention provides a cooling structure for a high-speed motor unit with integrated compression and expansion, comprising: The unit adopts a cooling system combining water cooling and forced air cooling. Water cooling is used to cool the motor stator, while forced air cooling is mainly used to cool the motor rotor and the bearings on both sides.

[0006] In some embodiments, the cooling water circuit has two sets of interfaces, one for water inlet and one for water outlet, and the cooling water channel adopts a spiral design and is located in the housing outside the motor stator.

[0007] In some embodiments, the cooling air path has four sets of interfaces, which are respectively located at the volute bearing housing, the near-volute side of the housing, the near-pressure side of the housing, and the pressure end bearing housing. The design adopts a two-inlet and two-outlet configuration, and the cooling of the whole machine can be adjusted by adjusting the air volume of each interface.

[0008] In some embodiments, the four sets of intake and exhaust channels all adopt a pre-embedded full-circumferential air distribution ring design. The connecting passage from the air distribution ring to the motor cavity / bearing cavity is circumferentially distributed, thereby improving the uniformity of air intake in the motor cavity and the circumferential uniformity of the temperature field of each component.

[0009] In some embodiments, the cooling air paths of the motor stator and rotor and the bearings on both sides are designed in parallel, so that the motor stator and rotor and the magnetic bearings at both ends are cooled separately.

[0010] In some embodiments, the cooling water channel is provided around the housing outside the motor stator; Cooling water flows in from the cooling water inlet and flows out from the cooling water outlet.

[0011] In some embodiments, the air inlet of the housing air distribution ring is divided into multiple equal-diameter interfaces, and the air outlet has a circumferentially distributed structure.

[0012] In some embodiments, the air inlet of the housing air distribution ring is divided into three equal-diameter interfaces, and the air outlet has ten equal-diameter interfaces evenly distributed circumferentially.

[0013] In some embodiments, the outlet of the air distribution ring of the pressure end bearing housing has a circumferentially distributed structure.

[0014] In some embodiments, the air outlet of the pressure end bearing housing air inlet distribution ring has sixteen equal-diameter interfaces that are evenly distributed circumferentially.

[0015] Compared with the prior art, the present invention has the following advantages: the temperature field of the whole machine can be adjusted by adjusting the water inlet / airflow of each interface; the uniformity of air intake in the motor cavity can be effectively improved to optimize the cooling and heat dissipation effect. Attached Figure Description

[0016] The accompanying drawings illustrate, by way of example and not limitation, the various embodiments discussed herein.

[0017] Figure 1 This is a diagram showing the main structural components of a high-speed motor unit with integrated compression and expansion according to an embodiment of the present invention; Figure 2 This is a cooling interface diagram of a high-speed motor unit with integrated compression and expansion according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the cooling airflow inside a high-speed motor unit with integrated compression and expansion according to an embodiment of the present invention; Figure 4 This is a cooling water flow diagram of a high-speed motor unit with integrated compression and expansion according to an embodiment of the present invention; Figure 5 This is a diagram of the air intake and distribution circulation channel of a high-speed motor unit with integrated compression and expansion according to an embodiment of the present invention. Figure 6 This is a diagram of the air inlet and distribution circulation channel of the pressure end bearing housing of a high-speed motor unit with integrated compression and expansion according to an embodiment of the present invention.

[0018] Symbol explanation: 1-Vortex end bearing housing cover plate, 2-Vortex end bearing housing, 3-Jet housing, 4-Water flow channel cover plate, 5-Pressure end bearing housing, 6-Pressure end bearing housing cover plate, 7-Pressure end protection bearing, 8-Thrust magnetic bearing, 9-Pressure end radial magnetic bearing, 10-Motor stator, 11-Motor rotor, 12-Motor rotor sheath, 13-Vortex end radial magnetic bearing, 14-Shaft, 15-Vortex end protection bearing, 16-Vortex end bearing housing cooling air inlet, 17-Jet housing near-vortex side cooling air inlet, 18-Cooling water outlet inlet, 19-Cooling water inlet inlet, 20-Jet housing near-pressure side cooling air inlet, 21-Pressure end 22 - Cooling air inlet for the housing near the vortex side; 23 - Cooling air inlet for the pressure end bearing housing; 24 - Cooling air for the vortex end radial magnetic bearing; 25 - Cooling air for the motor rotor; 26 - Cooling air for the pressure end radial magnetic bearing; 27 - Cooling air for the thrust magnetic bearing; 28 - Cooling air outlet for the vortex end bearing housing; 29 - Cooling air outlet for the housing near the pressure side; 30 - Cooling water outlet; 31 - Cooling water inlet; 32 - Air inlet for the housing air distribution ring; 33 - Air outlet for the housing air distribution ring; 34 - Air inlet for the pressure end bearing housing air distribution ring; 35 - Air outlet for the pressure end bearing housing air distribution ring. Detailed Implementation

[0019] In order to gain a more detailed understanding of the features and technical content of the embodiments of this application, the implementation of the embodiments of this application will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of this application.

[0020] In the embodiments described in this application, it should be noted that, unless otherwise stated and limited, the term "connection" should be interpreted broadly. For example, it can be an electrical connection, or a connection between two internal components. It can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above term according to the specific circumstances.

[0021] It should be noted that the terms "first," "second," and "third" used in the embodiments of this application are merely used to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first," "second," and "third" can be interchanged in a specific order or sequence where permitted. It should be understood that the objects distinguished by "first," "second," and "third" can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in an order other than those illustrated or described herein.

[0022] This invention is achieved through the following technical solution: (1) The unit adopts a cooling system that combines water cooling and forced air cooling. Water cooling is used for cooling the motor stator, while forced air cooling is mainly used for cooling the motor rotor and the bearings on both sides.

[0023] (2) The cooling water circuit has two sets of interfaces for water inlet and water outlet. The cooling water channel adopts a spiral design and is located in the housing outside the motor stator.

[0024] (3) Four sets of cooling air ducts are reserved, respectively located at the turbine end bearing housing, the near-turbine side of the housing, the near-pressure side of the housing, and the pressure end bearing housing component / position. A two-inlet and two-outlet design is adopted, and the cooling of the whole machine can be adjusted by adjusting the air volume of each interface. The four sets of air inlet and outlet ducts of the unit adopt a pre-embedded full-circumferential air distribution ring design. The connecting passage from the air distribution ring to the motor cavity / bearing cavity is circumferentially evenly distributed, thereby making the air intake of the motor cavity more uniform and improving the circumferential uniformity of the temperature field of each component. In addition, the cooling air ducts of the motor stator and rotor and the bearings on both sides are designed in parallel, and the motor stator and rotor and the magnetic bearings at both ends are cooled separately. Compared with the series air duct cooling, the hot air after cooling the motor stator and rotor can minimize the impact on the cooling of the bearings.

[0025] The main structural composition diagram of the integrated compression and expansion high-speed motor unit of the present invention is shown below. Figure 1 As shown, the main components include a vortex end bearing housing cover plate (1), a vortex end bearing housing (2), a housing (3), a water flow channel cover plate (4), a pressure end bearing housing (5), a pressure end bearing housing cover plate (6), a pressure end protection bearing (7), a thrust magnetic bearing (8), a pressure end radial magnetic bearing (9), a motor stator (10), a motor rotor (11), a motor rotor sheath (12), a vortex end radial magnetic bearing (13), a rotating shaft (14), and a vortex end protection bearing (15). The rotor portion of the rotating shaft (14) houses the pressure end protection bearing (7), the motor rotor (11), the motor rotor sheath (12), the thrust magnetic bearing (8), the pressure end radial magnetic bearing (9), and the vortex end radial magnetic bearing (13), as well as the vortex end protection bearing (15). Furthermore, splines are reserved at both ends of the rotating shaft (14) as interfaces between the compressor and the turbine.

[0026] The cooling interface diagram of the integrated compression and expansion high-speed motor unit of the present invention is shown below. Figure 2 As shown, there are a total of six sets of interfaces. There are four sets of cooling air interfaces: the turbine end bearing housing cooling air interface (16), the housing near-turbine side cooling air interface (17), the housing near-pressure side cooling air interface (20), and the pressure end bearing housing cooling air interface (21). Among them, the turbine end bearing housing cooling air interface (16) and the pressure end bearing housing cooling air interface (21) are each equipped with one flange interface, and the housing near-turbine side cooling air interface (17) and the housing near-pressure side cooling air interface (20) are each equipped with three flange interfaces. There are two sets of cooling water interfaces: the cooling water outlet interface (18) and the cooling water inlet interface (19). The cooling water interfaces can be connected by threads or flanges.

[0027] A schematic diagram of the cooling gas flow inside the integrated compression and expansion high-speed motor unit of the present invention is shown below. Figure 3As shown. Cooling gas flows into the unit from the near-vortex side cooling gas inlet (17) of the casing and the pressure end bearing housing cooling gas inlet (21), which are the near-vortex side inlet cooling gas (22) of the casing and the pressure end bearing housing inlet cooling gas (23); the cooling gas in the unit cavity is based on Figure 3 The arrows indicate the directions of sequential splitting and merging, and cooling of each component, forming cooling gas including the vortex end radial magnetic bearing cooling gas (24), motor rotor cooling gas (25), pressure end radial magnetic bearing cooling gas (26), and thrust magnetic bearing cooling gas (27); finally, the cooling gas flows out of the unit from the vortex end bearing housing cooling gas interface (16) and the casing near-pressure side cooling gas interface (20), namely the vortex end bearing housing outlet cooling gas (28) and the casing near-pressure side outlet cooling gas (29).

[0028] The cooling water flow path diagram of the integrated compression and expansion high-speed motor unit of the present invention is shown below. Figure 4 As shown. The cooling water channel adopts a spiral design, and in the example, it rotates three and a half times. Cooling water flows in from the cooling water inlet (31) and flows out from the cooling water outlet (30).

[0029] The air intake and distribution circulation channel diagram of the integrated compression and expansion high-speed motor unit of the present invention is shown below. Figure 5 As shown. Cooling gas enters the air distribution ring from the air inlet (32) of the housing air distribution ring, flows out of the air distribution ring from the air outlet (33) of the housing air distribution ring, and enters the motor cavity. Since the air flow rate in the housing air distribution ring is usually large, the air inlet (32) of the housing air distribution ring is divided into three equal-diameter ports. In order to enhance the uniformity of air intake in the motor cavity, the air outlet (33) of the housing air distribution ring has a circumferentially distributed structure, and there are ten equal-diameter ports in this example.

[0030] The air inlet and distribution circulation channel diagram of the pressure end bearing housing of the integrated compression and expansion high-speed motor unit of the present invention is shown below. Figure 6 As shown. Cooling gas enters the distribution ring from the air inlet (34) of the air inlet distribution ring of the pressure end bearing housing, and flows out of the distribution ring from the air outlet (35) of the air inlet distribution ring of the pressure end bearing housing and enters the pressure end bearing cavity. In order to enhance the uniformity of air intake in the pressure end bearing cavity, the air outlet (35) of the air inlet distribution ring of the pressure end bearing housing has a circumferentially uniform structure, and there are a total of sixteen equal diameter interfaces in this example.

[0031] The technical solutions described in the embodiments of this application can be combined arbitrarily without conflict.

[0032] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cooling structure for a high-speed motor unit with integrated compression and expansion, characterized in that, include: The unit adopts a cooling system combining water cooling and forced air cooling. Water cooling is used to cool the motor stator, while forced air cooling is mainly used to cool the motor rotor and the bearings on both sides.

2. The cooling structure of the integrated compression and expansion high-speed motor unit according to claim 1, characterized in that, The cooling water circuit has two sets of interfaces, one for water inlet and one for water outlet. The cooling water channel adopts a spiral design and is located in the housing outside the motor stator.

3. The cooling structure of the integrated compression and expansion high-speed motor unit according to claim 1, characterized in that, The cooling airflow path has four sets of interfaces, which are respectively located at the turbine end bearing housing, the turbine side of the housing, the pressure side of the housing, and the pressure end bearing housing. It adopts a two-inlet and two-outlet design, and the cooling of the whole machine can be adjusted by adjusting the airflow of each interface.

4. The integrated compression and expansion high-speed motor unit cooling structure according to claim 3, characterized in that, All four sets of intake and exhaust channels adopt a pre-embedded full-circumferential air distribution ring design. The connecting passage from the air distribution ring to the motor cavity / bearing cavity is circumferentially distributed, thereby improving the uniformity of air intake in the motor cavity and the circumferential uniformity of the temperature field of each component.

5. The cooling structure of the integrated compression and expansion high-speed motor unit according to claim 1, characterized in that, The cooling air paths for the motor stator and rotor and the bearings on both sides are designed in parallel, so that the motor stator and rotor and the magnetic bearings at both ends are cooled separately.

6. The integrated compression-expansion high-speed motor unit cooling structure according to claim 2, characterized in that, The cooling water channel is arranged around the outer casing of the motor stator; Cooling water flows in from the cooling water inlet and flows out from the cooling water outlet.

7. The cooling structure of the integrated compression and expansion high-speed motor unit according to claim 4, characterized in that, The intake port of the air distribution ring of the housing is divided into multiple equal diameter interfaces, and the outlet has a circumferentially distributed structure.

8. The cooling structure of the integrated compression and expansion high-speed motor unit according to claim 7, characterized in that, The intake port of the housing air distribution ring is divided into three equal-diameter interfaces, and the outlet has ten equal-diameter interfaces that are evenly distributed circumferentially.

9. The cooling structure of the integrated compression and expansion high-speed motor unit according to claim 4, characterized in that, The air outlet of the air inlet distribution ring of the pressure end bearing housing has a circumferentially distributed structure.

10. The cooling structure of the integrated compression-expansion high-speed motor unit according to claim 9, characterized in that, The air outlet of the air inlet distribution ring of the pressure end bearing housing has sixteen equal-diameter interfaces that are evenly distributed circumferentially.

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