CN113489221A

CN113489221A - Motor cooling structure, motor and compressor

Info

Publication number: CN113489221A
Application number: CN202110887826.4A
Authority: CN
Inventors: 刘畅; 赵万东; 于博
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-08-03
Filing date: 2021-08-03
Publication date: 2021-10-08

Abstract

The invention provides a motor cooling structure, a motor and a compressor, wherein the motor cooling structure comprises a stator core, a cooling water jacket and a shell, the cooling water jacket is sleeved on the outer peripheral side of the stator core, the shell is sleeved on the outer peripheral side of the cooling water jacket, a stator winding is wound on the stator core, the motor cooling structure also comprises a heat pipe, one end of the heat pipe is in contact connection with the stator core, and the other end of the heat pipe is at least partially in contact connection with the cooling water jacket. According to the invention, the heat generated by the stator winding is directly introduced into the cooling water jacket through the heat pipe with high heat conductivity, and is efficiently taken away through the cooling liquid in the cooling water jacket, so that the thermal resistance is effectively reduced, the temperature of the stator winding with larger heat productivity is greatly reduced, the baking of the stator winding on the rotor assembly is reduced, and the temperature of the rotor is reduced.

Description

Motor cooling structure, motor and compressor

Technical Field

The invention belongs to the technical field of motor manufacturing, and particularly relates to a motor cooling structure, a motor and a compressor.

Background

The centrifugal air compressor is one of key components in an air supply module of an auxiliary system of an engine of a new energy fuel cell automobile, has the function of providing air meeting the requirements of flow, pressure, temperature and humidity of a galvanic pile when the galvanic pile of a fuel cell system works under different working conditions, and the performance of the centrifugal air compressor directly influences key performance indexes of efficiency, dynamic performance, noise and the like of the fuel cell.

With the progress of a series of basic subjects such as gas dynamics, material science and the like and the improvement of a manufacturing process, the revolution of the ultra-high-speed gas suspension air compressor can reach more than 100000 rpm. When the air compressor runs, a large amount of heat can be generated by a motor stator, a rotor and an air suspension bearing, if the heat cannot be taken out in time, the air compressor runs under a long-term high-temperature working condition, serious damages such as failure of an air bearing coating, demagnetization of the motor and the like are easily caused, and even the whole machine is cracked, so that the cooling system of the ultra-high-speed centrifugal air compressor is very important.

Aiming at the technical problem of heat dissipation of an air compressor, the conventional technical means mainly comprises liquid cooling and gas cooling. For example, the prior art discloses a high-speed motor cooling mechanism for a fuel cell air compressor, and compared with a common air compressor cooling structure, the structure is additionally provided with an air-cooled impeller assembly, an air-cooled impeller and a rotor are coaxial and are arranged between a left shell and a thrust bearing seat, and an active air-cooled heat dissipation mechanism is additionally arranged, so that the airflow disturbance in a motor cavity is increased, the cooling of the motor rotor is realized, and the overall cooling effect is favorably improved.

Although the above technical solution enhances the heat dissipation effect of air cooling, the structure has the following three disadvantages:

1. the structure is used for a single-stage compressor, and is not suitable for a two-stage compressor with higher pressure ratio;

2. an air-cooled impeller is additionally arranged on the rotor, so that the wind resistance is increased, and the energy efficiency of the compressor is reduced;

3. a gap is reserved between the stator winding and the stator core, heat transfer resistance to the cooling water jacket is large, a large amount of heat is taken away through air convection, but the heat dissipation efficiency of air convection cooling is low, so that the temperature rise of the stator is high, and meanwhile, the heat bakes the rotor, so that the temperature of the rotor is raised.

Disclosure of Invention

Therefore, the invention provides a motor cooling structure, a motor and a compressor, which can overcome the defects of large heat resistance of heat transfer from stator windings and stator cores to a cooling water jacket and high temperature rise of a stator and a rotor in the related art.

In order to solve the above problems, the present invention provides a motor cooling structure, which includes a stator core, a cooling water jacket, a housing, a heat pipe, wherein the cooling water jacket is sleeved on an outer peripheral side of the stator core, the housing is sleeved on an outer peripheral side of the cooling water jacket, a stator winding is wound on the stator core, one end of the heat pipe is in contact connection with the stator core, and the other end of the heat pipe is at least partially in contact connection with the cooling water jacket.

Preferably, a cooling flow channel is arranged in the cooling water jacket, and the other end of the heat pipe extends into the cooling flow channel.

Preferably, the stator core has a plurality of stator teeth, a stator slot is formed between two adjacent stator teeth, the stator winding part is located in the stator slot, a baffle is arranged at a notch of the stator slot, and the one end of the heat pipe is located between the baffle and the stator winding.

Preferably, the end of the baffle has a groove, and the one end of the heat pipe is inserted into the groove.

Preferably, the one end and/or the other end of the heat pipe is coated with a heat conducting interface material.

Preferably, the heat-conducting interface material comprises one of heat-conducting silicone grease, heat-conducting gel and heat-conducting gasket.

Preferably, the housing is configured with a cooling gas inlet pipe and a cooling gas outlet pipe, and the cooling gas inlet pipe and the cooling gas outlet pipe are arranged at intervals along the axial direction of the housing.

Preferably, the heat pipe is disposed at an end of the stator core close to the cooling gas outlet pipe.

The invention also provides a motor which comprises the motor cooling structure.

The invention also provides a compressor which comprises the motor cooling structure.

According to the motor cooling structure, the motor and the compressor, heat generated by the stator winding is directly led into the cooling water jacket through the high-heat-conduction heat pipe, and is efficiently taken away through cooling liquid in the cooling water jacket, so that the thermal resistance is effectively reduced, the temperature of the stator winding with larger heat productivity is greatly reduced, the baking of the stator winding on the rotor assembly is reduced, and the temperature of a rotor is reduced.

Drawings

Fig. 1 is a disassembled structure schematic diagram (not shown in the figures) of the motor cooling structure according to the embodiment of the present invention;

fig. 2 is a perspective view of the cooling structure of the motor shown in fig. 1;

fig. 3 is a schematic perspective view of another implementation manner of the motor cooling structure according to the embodiment of the present invention (the housing is not shown in the figure);

fig. 4 is a schematic structural diagram (internal cross section, and the housing is not shown) of still another implementation manner of the motor cooling structure according to the embodiment of the invention;

fig. 5 is a schematic view of an internal structure of a compressor according to an embodiment of the present invention.

The reference numerals are represented as:

1. a stator core; 11. stator teeth; 12. a baffle plate; 2. a cooling water jacket; 21. a cooling flow channel; 22. a water jacket slot; 3. a housing; 4. a stator winding; 5. a heat pipe; 61. a cooling gas introduction pipe; 62. a cooling gas outlet pipe; 63. a coolant introduction pipe; 64. a coolant outlet pipe; 100. a rotor assembly; 101. a thrust bearing; 102. a radial bearing; 103. and a bearing support.

Detailed Description

Referring to fig. 1 to 5 in combination, according to an embodiment of the present invention, there is provided a motor cooling structure, including a stator core 1, a cooling water jacket 2, a housing 3, the cooling water jacket 2 is sleeved (e.g., in an interference fit) on an outer peripheral side of the stator core 1, the housing 3 is sleeved (e.g., in an interference fit) on an outer peripheral side of the cooling water jacket 2, a stator winding 4 is wound on the stator core 1, and further including a heat pipe 5, one end of the heat pipe 5 is in contact connection with the stator core 1, and the other end of the heat pipe 5 is at least partially in contact connection with the cooling water jacket 2, it can be understood that the contact connection refers to the direct contact of one end or the other end of the heat pipe with the mating cooling water jacket 2 or stator winding 4 to form heat transfer. In the technical scheme, the heat generated by the stator winding 4 is directly introduced into the cooling water jacket 2 through the heat pipe 5 with high heat conductivity, and the heat is efficiently taken away through the cooling liquid in the cooling water jacket 2, so that the thermal resistance is effectively reduced, the temperature of the stator winding 4 with large heat productivity is greatly reduced, the baking of the stator winding 4 on the rotor assembly 100 is reduced, and the temperature of the rotor is reduced.

The cooling water jacket 2 has a cooling flow channel 21 therein, in some embodiments, the cooling flow channel 21 is a spiral groove opened toward one side of the outer shell 3, and the other end of the heat pipe 5 extends into the cooling flow channel 21 (as shown in fig. 4), so as to realize direct contact between the heat pipe 5 and the cooling liquid in the cooling flow channel 21, further reduce heat transfer resistance, and improve heat dissipation efficiency. It is understood that the housing 3 is configured with a cooling liquid inlet pipe 63 and a cooling liquid outlet pipe 64, the cooling liquid in the external cooling liquid source is introduced into the cooling flow channel 21 through the cooling liquid inlet pipe 63, and the cooling liquid is led out from the cooling liquid outlet pipe 64 after heat exchange, so as to form a cooling circulation of the cooling liquid.

The stator core 1 is provided with a plurality of stator teeth 11, a stator slot is formed between every two adjacent stator teeth 11, the stator winding 4 is partially positioned in the stator slot, a baffle plate 12 is arranged at the notch of the stator slot, and the one end of the heat pipe 5 is positioned between the baffle plate 12 and the stator winding 4. In the technical scheme, the gap between the baffle 12 with the insulation and isolation effect and the stator winding 4 is used for clamping and fixing one end of the heat pipe 5, a fixing structure does not need to be designed for the one end of the heat pipe 5 independently, and the structure design is simplified. In some embodiments, the end of the baffle 12 has a groove, the end of the heat pipe 5 is inserted into the groove, and it is understood that the groove forms a holding space for the end of the heat pipe 5, and preferably, the groove has an opening surface facing the stator winding 4 side to ensure that the end of the heat pipe 5 can directly contact the stator winding 4, and the groove can be formed by cutting in the baffle 12. And the other end of the heat pipe 5 can be inserted into a water jacket slot 22 on one end surface of the cooling water jacket 2.

In some embodiments, the one end and/or the other end of the heat pipe 5 is coated with a heat conducting interface material, such as one of a heat conducting silicone grease, a heat conducting gel, and a heat conducting gasket. The heat-conducting interface material can further reduce heat transfer resistance and improve cooling and heat dissipation efficiency.

In some embodiments, the housing 3 is configured with a cooling gas inlet pipe 61 and a cooling gas outlet pipe 62, and the cooling gas inlet pipe 61 and the cooling gas outlet pipe 62 are arranged at intervals along the axial direction of the housing 3. In the technical scheme, on the basis that the cooling water jacket 2 is adopted to cool the stator core 1 and the stator winding 4, the external cooling gas is further introduced to cool the inside of the stator winding 4, particularly, one side of the stator winding 4 far away from the stator core 1 and the rotor assembly 100 are efficiently cooled, and the temperature rise can be further reduced.

In some embodiments, as shown in fig. 3, the heat pipes 5 may be disposed at two axial ends of the stator core 1, and a plurality of the heat pipes 5 are disposed at each end, so that efficient cooling and heat dissipation of the internal components of the housing 3 can be achieved. And when still construct on the shell 3 cooling gas inlet tube 61 and cooling gas outlet tube 62, heat pipe 5 set up in stator core 1 is close to the one end of cooling gas outlet tube 62, promptly heat pipe 5 is set up the downstream side in the circulation direction of cooling air current, improves stator winding 4's temperature uniformity nature, reduces the interior air temperature of shell, avoids near the air bearing and the rotor subassembly heat transfer to temperature sensitive, improves the safety in utilization and the life of bearing, avoids the motor inefficacy. And the airflow heat dissipation adopting the application can be right

The motor cooling structure provided by the invention absorbs heat through evaporation of the working medium in the heat pipe 5 near the stator winding 4 and releases heat through condensation near the cooling water jacket 2, and flows back to one side of the stator winding 4 to continuously and rapidly transfer heat to the cooling water jacket 2, and the heat is dissipated by forced convection of cooling liquid instead of the traditional air cooling heat dissipation by introducing cooling gas, thereby greatly reducing the heat transfer resistance of the stator winding 4 with high heat productivity, and the downstream temperature of the cooling air path of the traditional air cooling heat dissipation is heated by the upstream device, the temperature is higher, the heat dissipation capability is weakened, the temperature difference between the two sides of the stator winding 4 is larger, and by adopting the cooling structure, most of heat of the stator winding 4 is conducted to the cooling water jacket 2 through the heat pipe 5, so that the heat dissipation burden of high-temperature cooling gas at the downstream of a gas path is further reduced, the temperatures of a rotor and an air bearing are further reduced, and the service life of a motor is prolonged.

According to an embodiment of the present invention, there is also provided a motor including the motor cooling structure described above.

According to an embodiment of the present invention, as shown in fig. 5, there is further provided a compressor, in particular, an ultra-high speed air suspension air compressor, including the above-mentioned motor cooling structure. Specifically, the housing 3 is a compressor housing, two axial ends of the compressor housing are respectively provided with corresponding bearing supports 103 to form a mounting carrier of a radial bearing 102, a rotor assembly 100 is further disposed in the housing 3, the rotor assembly 100 is supported in the housing 3 through the radial bearings 102 at the two axial ends of the rotor assembly 100, and an axial displacement of the rotor assembly 100 is further limited by two thrust bearings 101 which are oppositely disposed.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. The motor cooling structure is characterized by comprising a stator core (1), a cooling water jacket (2) and a shell (3), wherein the cooling water jacket (2) is sleeved on the outer peripheral side of the stator core (1), the shell (3) is sleeved on the outer peripheral side of the cooling water jacket (2), a stator winding (4) is wound on the stator core (1), the motor cooling structure further comprises a heat pipe (5), one end of the heat pipe (5) is in contact connection with the stator core (1), and the other end of the heat pipe (5) is at least partially in contact connection with the cooling water jacket (2).

2. The motor cooling structure according to claim 1, wherein a cooling flow passage (21) is provided in the cooling water jacket (2), and the other end of the heat pipe (5) protrudes into the cooling flow passage (21).

3. The electric machine cooling structure according to claim 1, wherein the stator core (1) has a plurality of stator teeth (11), a stator slot is formed between two adjacent stator teeth (11), the stator winding (4) is partially located in the stator slot, a baffle (12) is arranged at a notch of the stator slot, and the one end of the heat pipe (5) is located between the baffle (12) and the stator winding (4).

4. A cooling structure of an electric motor according to claim 3, characterized in that the end of the baffle plate (12) has a groove, and the one end of the heat pipe (5) is inserted into the groove.

5. A motor cooling arrangement according to claim 3, characterised in that the one and/or the other end of the heat pipe (5) is coated with a heat conducting interface material.

6. The electric machine cooling structure of claim 5, wherein the thermally conductive interface material comprises one of a thermally conductive silicone grease, a thermally conductive gel, and a thermally conductive gasket.

7. The motor cooling structure according to claim 1, wherein a cooling air introduction pipe (61) and a cooling air discharge pipe (62) are configured on the housing (3), and the cooling air introduction pipe (61) and the cooling air discharge pipe (62) are arranged at intervals along an axial direction of the housing (3).

8. The motor cooling structure according to claim 7, wherein the heat pipe (5) is provided at an end of the stator core (1) near the cooling gas outlet pipe (62).

9. An electric motor characterized by comprising the motor cooling structure of any one of claims 1 to 8.

10. A compressor characterized by comprising the motor cooling structure of any one of claims 1 to 8.