CN118100524A - Method for cooling motor rotor of high-speed magnetic levitation motor direct-drive heat pump compressor - Google Patents
Method for cooling motor rotor of high-speed magnetic levitation motor direct-drive heat pump compressor Download PDFInfo
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- CN118100524A CN118100524A CN202410309376.4A CN202410309376A CN118100524A CN 118100524 A CN118100524 A CN 118100524A CN 202410309376 A CN202410309376 A CN 202410309376A CN 118100524 A CN118100524 A CN 118100524A
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- 238000001816 cooling Methods 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims description 33
- 238000005339 levitation Methods 0.000 title claims description 17
- 239000007788 liquid Substances 0.000 claims description 25
- 230000008569 process Effects 0.000 claims description 19
- 230000007246 mechanism Effects 0.000 claims description 12
- 239000002826 coolant Substances 0.000 claims description 11
- 239000000725 suspension Substances 0.000 abstract description 13
- 238000010586 diagram Methods 0.000 description 13
- 239000007789 gas Substances 0.000 description 7
- 230000003068 static effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000011555 saturated liquid Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Abstract
The invention relates to the technical field of cooling of magnetic suspension motors, in particular to a motor rotor cooling method of a high-speed magnetic suspension motor direct-drive heat pump compressor.
Description
Technical Field
The invention relates to the technical field of cooling of magnetic suspension motors, in particular to a method for cooling a motor rotor of a direct-drive heat pump compressor of a high-speed magnetic suspension motor.
Background
A heat pump is a device that transfers thermal energy from a low temperature heat source to a high temperature heat source. The working mechanism of the heat pump cycle mainly realizes energy transfer through working medium phase change (see fig. 1 and 2), a low-temperature low-pressure gas-liquid mixed working medium (T1, P1) is evaporated to a low-temperature low-pressure overheated gas working medium (T2, P2) through an evaporator, the overheated gas is pressurized through a heat pump compressor to be changed into a high-temperature high-pressure overheated gas working medium (T3, P3), heat is transferred to a high-temperature heat source through heat exchange between a condenser and a high-temperature heat source (Thot), the high-temperature high-pressure overheated gas working medium is changed into a high-temperature high-pressure saturated liquid working medium (T4, P4), and the saturated liquid working medium is decompressed into a gas-liquid mixed working medium (T1, P1) through a decompression valve to enter the next cycle. Through this cycle, the heat from the low temperature heat source is "pumped" into the high temperature heat source.
The compressor is a key design of the heat pump cycle, and its working efficiency and stability affect the efficiency and stability of the whole heat pump cycle. In order to operate efficiently, the existing heat pump compressor is usually directly connected with a high-efficiency high-speed geomagnetic suspension motor to provide a power source for the compressor, and the heat pump compressor is hung with air compressing impellers on two sides of the magnetic suspension motor according to heat source parameters to realize efficient heat energy transfer, so that the heat pump compressor is made into a fully-closed two-stage magnetic suspension motor direct-drive heat pump compressor, as shown in fig. 3, 1 is a first-stage air compressor shell, 2 is the first-stage air compressing impeller, 3 is a first-stage interstage air seal, 4 is a first-stage connecting flange, 5 is a motor rotor, 6 is the magnetic suspension motor, 7 is a second-stage interstage air seal, 8 is a second-stage connecting flange, 9 is a second-stage air compressor shell, and 10 is a second-stage air compressing impeller.
The rotor of the magnetic suspension motor consists of a permanent magnet and a magnetic suspension bearing, and is suspended in the air and rotates along with a rotating magnetic field, so that power output is realized, however, the rotor can continuously dissipate heat in the process of outputting power in a rotating way, so that the temperature of the rotor is continuously increased, and when the temperature of the rotor is too high, the permanent magnet of the rotor can be irreversibly demagnetized. Therefore, the cooling of the rotor of the magnetic suspension motor is extremely important.
The existing cooling for the magnetic suspension motor rotor is natural air cooling, forced air cooling and water cooling, the natural air cooling can flow air into a compressor working medium through dynamic and static intermittence, so that the efficiency of the compressor is affected, the forced air cooling is complicated for the heat pump compressor with both sides respectively hanging the air compressing impeller, a fan cannot be arranged, the water cooling can cause impact and corrosion to the motor rotor, the motor is not utilized to stably operate for a long time, and the internal structure is complicated.
Disclosure of Invention
The invention aims to provide a method for cooling a motor rotor of a high-speed magnetic levitation motor direct-drive heat pump compressor, which aims to solve the technical problems that in the prior art, natural air cooling can flow air into a working medium of the compressor through dynamic and static intermittence so as to influence the efficiency of the compressor, the internal structure of the heat pump compressor with air compressing impellers hung on two sides by forced air cooling is complex, a fan cannot be arranged, water cooling can cause impact and corrosion to the motor rotor, the motor is not utilized to stably operate for a long time, and the internal structure is complex.
In order to achieve the purpose, the invention discloses a motor rotor cooling method of a high-speed magnetic levitation motor direct-drive heat pump compressor, which comprises the following steps:
step one: transferring heat energy of the low-temperature heat source to the high-temperature heat source through the evaporator, the heat pump compressor, the condenser and the pressure reducing valve;
Step two: collecting the temperature at the outlet of the heat pump compressor and transmitting the temperature to an external controller;
step three: the controller controls the cooling mechanism to cool the motor rotor in the heat pump compressor according to the transmitted temperature.
When the temperature at the outlet of the heat pump compressor is less than 50 ℃, the temperature at the outlet of the heat pump compressor is less than the temperature of a motor rotor in the heat pump compressor;
The cooling mechanism comprises a motor cooling air inlet and a motor cooling air outlet, the motor cooling air inlet is connected with the outlet of the heat pump compressor and the motor rotor of the heat pump compressor, and the motor cooling air outlet is connected with the inlet of the heat pump compressor and the motor rotor of the heat pump compressor;
The specific cooling process is as follows:
And the air at the outlet of the heat pump compressor is introduced into the motor through the cooling air inlet of the motor, and the cooling is completed through the cooling air outlet of the motor after cooling the motor rotor and introducing the cooling air into the inlet of the compressor.
When the temperature at the outlet of the heat pump compressor is greater than or equal to 50 ℃, the temperature at the outlet of the heat pump compressor is greater than the temperature of a motor rotor in the heat pump compressor;
The cooling mechanism comprises a motor cooling air inlet, a motor cooling air outlet, a gas-liquid separator and a working medium pump, wherein the gas-liquid separator is connected with a low-temperature low-pressure working medium, the working medium pump is connected with the gas-liquid separator, the motor cooling air inlet is connected with the working medium pump and a motor rotor of the heat pump compressor, and the motor cooling air outlet is connected with a heat pump compressor inlet and a motor rotor of the heat pump compressor;
The specific cooling process is as follows:
The low-temperature low-pressure working medium is introduced into the gas-liquid separator, and the gas-liquid separator separates the low-temperature low-pressure working medium;
The separated low-temperature liquid is introduced into the evaporator to complete the subsequent process, the low-temperature gas is pressurized by the working medium pump, and the low-temperature high-pressure gaseous working medium is introduced into the motor cooling medium inlet to cool the motor rotor;
And introducing the cooled low-temperature high-pressure gaseous working medium into the inlet of the compressor, and continuing to compress to finish the subsequent process.
When the temperature at the outlet of the heat pump compressor is greater than or equal to 50 ℃, the temperature at the outlet of the heat pump compressor is greater than the temperature of a motor rotor in the heat pump compressor;
The cooling mechanism comprises a motor cooling inlet, a motor cooling outlet and a preheater, the preheater is arranged between the pressure reducing valve and the evaporator, the preheater is connected with the compressor and the motor cooling inlet, and the motor cooling outlet is connected with the inlet of the heat pump compressor and the motor rotor of the heat pump compressor;
The specific cooling process is as follows:
The high-temperature high-pressure gaseous working medium led out from the outlet of the heat pump compressor exchanges heat with the low-temperature low-pressure gas-liquid mixed working medium led out from the pressure reducing valve in the preheater;
The high-temperature high-pressure gaseous working medium subjected to heat exchange is changed into a high-temperature high-pressure gaseous working medium, and then the high-temperature high-pressure gaseous working medium is introduced into the motor through the cooling air inlet of the motor to cool the motor rotor;
And introducing the cooled low-temperature high-pressure gaseous working medium into an inlet of the heat pump compressor, and continuing to compress to finish the subsequent process.
According to the motor rotor cooling method of the high-speed magnetic suspension motor direct-drive heat pump compressor, the heat energy of a low-temperature heat source is transferred to a high-temperature heat source through the evaporator, the heat pump compressor, the condenser and the pressure reducing valve, the temperature at the outlet of the heat pump compressor is collected and is transmitted to the external controller, and the controller controls the cooling mechanism to cool the motor rotor in the heat pump compressor according to the transmitted temperature.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a temperature entropy diagram of a heat pump cycle of the present invention.
Fig. 2 is a schematic diagram of a temperature entropy diagram of a heat pump cycle of the present invention.
Fig. 3 is a schematic diagram of a magnetic levitation motor direct-drive two-stage heat pump compressor of the present invention.
Fig. 4 is a schematic structural view of embodiment 1 of the present invention.
Fig. 5 is a flow chart of the steps of embodiment 1 of the present invention.
Fig. 6 is a schematic structural view of embodiment 2 of the present invention.
Fig. 7 is a flow chart of the steps of embodiment 2 of the present invention.
Fig. 8 is a schematic structural view of embodiment 3 of the present invention.
Fig. 9 is a temperature entropy diagram corresponding to example 3 of the present invention.
Fig. 10 is a flow chart of the steps of embodiment 3 of the present invention.
Fig. 11 is a schematic view of the direction of intake of the motor rotor cooling medium of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Referring to fig. 1 to 3, fig. 1 is a temperature entropy diagram of a heat pump cycle according to the present invention, fig. 2 is a schematic diagram of a temperature entropy diagram of a heat pump cycle according to the present invention, and fig. 3 is a schematic diagram of a magnetic levitation motor direct-drive two-stage heat pump compressor according to the present invention. The invention provides a method for cooling a motor rotor of a high-speed magnetic levitation motor direct-drive heat pump compressor, which comprises the following steps:
step one: transferring heat energy of the low-temperature heat source to the high-temperature heat source through the evaporator, the heat pump compressor, the condenser and the pressure reducing valve;
Step two: collecting the temperature at the outlet of the heat pump compressor and transmitting the temperature to an external controller;
step three: the controller controls the cooling mechanism to cool the motor rotor in the heat pump compressor according to the transmitted temperature.
According to the invention, the heat energy of a low-temperature heat source is transferred to a high-temperature heat source through the evaporator, the heat pump compressor, the condenser and the pressure reducing valve, the temperature at the outlet of the heat pump compressor is collected and is transmitted to the external controller, and the controller controls the cooling mechanism to cool the motor rotor in the heat pump compressor according to the transmitted temperature.
Example 1: referring to fig. 4 and 5, fig. 4 is a schematic structural diagram of embodiment 1 of the present invention, and fig. 5 is a flowchart of steps of embodiment 1 of the present invention. The invention provides a motor rotor cooling method of a high-speed magnetic levitation motor direct-drive heat pump compressor, which comprises the following steps:
step one: transferring heat energy of the low-temperature heat source to the high-temperature heat source through the evaporator, the heat pump compressor, the condenser and the pressure reducing valve;
Step two: collecting the temperature at the outlet of the heat pump compressor and transmitting the temperature to an external controller;
Step three: when the temperature at the outlet of the heat pump compressor is less than 50 ℃, the temperature at the outlet of the heat pump compressor is less than the temperature of a motor rotor in the heat pump compressor;
Step four: and the air at the outlet of the heat pump compressor is introduced into the motor through the cooling air inlet of the motor, and the cooling is completed through the cooling air outlet of the motor after cooling the motor rotor and introducing the cooling air into the inlet of the compressor.
By adopting the method for cooling the motor rotor of the high-speed magnetic levitation motor direct-drive heat pump compressor, the structure is simple in the mode, extra equipment is not needed, cooling media are self-circulation working media of the heat pump compressor, the cooling media flow into the working media of the heat pump compressor through dynamic and static gaps, pollution to the working media of the heat pump compressor is avoided, the cooled media flow into the inlet of the compressor, the subsequent working procedures are completed through recompression, and the overall efficiency of the system is not reduced.
Example 2: referring to fig. 6 and 7, fig. 6 is a schematic structural diagram of embodiment 2 of the present invention, and fig. 7 is a flowchart of steps of embodiment 2 of the present invention. The invention provides a motor rotor cooling method of a high-speed magnetic levitation motor direct-drive heat pump compressor, which comprises the following steps:
step one: transferring heat energy of the low-temperature heat source to the high-temperature heat source through the evaporator, the heat pump compressor, the condenser and the pressure reducing valve;
Step two: collecting the temperature at the outlet of the heat pump compressor and transmitting the temperature to an external controller;
step three: when the temperature at the outlet of the heat pump compressor is greater than or equal to 50 ℃, the temperature at the outlet of the heat pump compressor is greater than the temperature of a motor rotor in the heat pump compressor;
step four: the low-temperature low-pressure working medium is introduced into the gas-liquid separator, and the gas-liquid separator separates the low-temperature low-pressure working medium;
step five: the separated low-temperature liquid is introduced into the evaporator to complete the subsequent process, the low-temperature gas is pressurized by the working medium pump, and the low-temperature high-pressure gaseous working medium is introduced into the motor cooling medium inlet to cool the motor rotor;
Step six: and introducing the cooled low-temperature high-pressure gaseous working medium into the inlet of the compressor, and continuing to compress to finish the subsequent process.
According to the method for cooling the motor rotor of the high-speed magnetic levitation motor direct-drive heat pump compressor, the evaporator inlet working medium (T1, P1) is a gas-liquid two-phase mixed working medium, but liquid working medium is introduced into the motor cooling rotor to impact and corrode the rotor and influence the stability and service life of the rotor, so that before the working medium led out of the evaporator inlet is pressurized, the gas-liquid separator is firstly arranged to separate the gas-liquid two-phase low-temperature low-pressure working medium, the liquid working medium is introduced into the evaporator again to complete the subsequent process, the separated low-temperature low-pressure gaseous working medium is pressurized through the working medium pump, the low-temperature high-pressure gaseous working medium is introduced into the motor cooling medium inlet to cool the motor rotor, and the cooled low-temperature high-pressure gaseous working medium is introduced into the heat pump compressor inlet to continue the subsequent process after compression, so that the motor rotor can be cooled more conveniently.
Example 3: referring to fig. 8 to 10, fig. 8 is a schematic structural diagram of embodiment 3 of the present invention, fig. 9 is a temperature entropy diagram corresponding to embodiment 3 of the present invention, and fig. 10 is a flow chart of steps of embodiment 3 of the present invention. The invention provides a motor rotor cooling method of a high-speed magnetic levitation motor direct-drive heat pump compressor, which comprises the following steps:
step one: transferring heat energy of the low-temperature heat source to the high-temperature heat source through the evaporator, the heat pump compressor, the condenser and the pressure reducing valve;
Step two: collecting the temperature at the outlet of the heat pump compressor and transmitting the temperature to an external controller;
step three: when the temperature at the outlet of the heat pump compressor is greater than or equal to 50 ℃, the temperature at the outlet of the heat pump compressor is greater than the temperature of a motor rotor in the heat pump compressor;
Step four: the heat exchange between the high-temperature high-pressure gaseous working medium led out from the outlet of the heat pump compressor and the low-temperature low-pressure gas-liquid mixed working medium led out from the pressure reducing valve is carried out in the preheater:
Step five: the high-temperature high-pressure gaseous working medium subjected to heat exchange is changed into a high-temperature high-pressure gaseous working medium, and then the high-temperature high-pressure gaseous working medium is introduced into the motor through the cooling air inlet of the motor to cool the motor rotor;
step six: and introducing the cooled low-temperature high-pressure gaseous working medium into an inlet of the heat pump compressor, and continuing to compress to finish the subsequent process.
According to the method for cooling the motor rotor of the high-speed magnetic levitation motor direct-drive heat pump compressor, the preheater is added before the evaporator behind the pressure reducing valve, a heat source of the preheater is a high-temperature high-pressure gaseous working medium (T3, P3) led out from an outlet of the heat pump compressor, a cold source is a low-temperature low-pressure gaseous working medium (T1, P1) behind the pressure reducing valve, after heat exchange of the preheater, the high-temperature high-pressure gaseous working medium (T3, P3) is changed into a low-temperature high-pressure gaseous working medium (T5, P5), then the low-temperature high-pressure gaseous working medium is led into a motor cooling medium inlet to cool the motor rotor, the cooled low-temperature high-pressure gaseous working medium is led into a heat pump compressor inlet (T2, P2), and the subsequent working procedures are continuously compressed, wherein the temperature and the pressure of each point are more than the temperature of the motor rotor is more than T5, and the temperature of P3 is more than P5 and more than P2; and after heat exchange, the cold source working medium of the preheater is introduced into the evaporator to enter a subsequent circulation process.
The motor rotor cooling methods adopted by the three embodiments of the invention all use the gaseous working medium of the heat pump circulation system as the cooling medium of the motor, thereby effectively solving the defects of the existing motor rotor cooling technology and simultaneously preventing the problem of system working medium pollution caused by introducing other gases from the outside;
Meanwhile, the cooling medium returns to the circulation system again after completing the cooling task, so that the problem of insufficient air-entraining efficiency of the system due to flow reduction is avoided, meanwhile, heat in the motor is also brought into the system and is effectively utilized by the system, and the system efficiency is improved.
In the invention, the air inlet direction beta of the cooling medium of the motor rotor is less than or equal to 135 degrees (as shown in figure 11), and the invention controls the air inlet direction beta of the cooling medium to be less than or equal to 135 degrees in order to prevent the motor rotor from vibrating due to disturbance caused by the impact of the introduced cooling medium on the motor rotor during operation
The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, and those skilled in the art will appreciate that all or part of the procedures described above can be performed according to the equivalent changes of the claims, and still fall within the scope of the present invention.
Claims (4)
1. The motor rotor cooling method of the high-speed magnetic levitation motor direct-drive heat pump compressor is characterized by comprising the following steps of:
step one: transferring heat energy of the low-temperature heat source to the high-temperature heat source through the evaporator, the heat pump compressor, the condenser and the pressure reducing valve;
Step two: collecting the temperature at the outlet of the heat pump compressor and transmitting the temperature to an external controller;
step three: the controller controls the cooling mechanism to cool the motor rotor in the heat pump compressor according to the transmitted temperature.
2. A method for cooling a motor rotor of a high-speed magnetic levitation motor direct-drive heat pump compressor according to claim 1,
When the temperature at the outlet of the heat pump compressor is less than 50 ℃, the temperature at the outlet of the heat pump compressor is less than the temperature of a motor rotor in the heat pump compressor;
The cooling mechanism comprises a motor cooling air inlet and a motor cooling air outlet, the motor cooling air inlet is connected with the outlet of the heat pump compressor and the motor rotor of the heat pump compressor, and the motor cooling air outlet is connected with the inlet of the heat pump compressor and the motor rotor of the heat pump compressor;
The specific cooling process is as follows:
And the air at the outlet of the heat pump compressor is introduced into the motor through the cooling air inlet of the motor, and the cooling is completed through the cooling air outlet of the motor after cooling the motor rotor and introducing the cooling air into the inlet of the compressor.
3. A method for cooling a motor rotor of a high-speed magnetic levitation motor direct-drive heat pump compressor according to claim 1,
When the temperature at the outlet of the heat pump compressor is greater than or equal to 50 ℃, the temperature at the outlet of the heat pump compressor is greater than the temperature of a motor rotor in the heat pump compressor;
The cooling mechanism comprises a motor cooling air inlet, a motor cooling air outlet, a gas-liquid separator and a working medium pump, wherein the gas-liquid separator is connected with a low-temperature low-pressure working medium, the working medium pump is connected with the gas-liquid separator, the motor cooling air inlet is connected with the working medium pump and a motor rotor of the heat pump compressor, and the motor cooling air outlet is connected with a heat pump compressor inlet and a motor rotor of the heat pump compressor;
The specific cooling process is as follows:
The low-temperature low-pressure working medium is introduced into the gas-liquid separator, and the gas-liquid separator separates the low-temperature low-pressure working medium;
The separated low-temperature liquid is introduced into the evaporator to complete the subsequent process, the low-temperature gas is pressurized by the working medium pump, and the low-temperature high-pressure gaseous working medium is introduced into the motor cooling medium inlet to cool the motor rotor;
And introducing the cooled low-temperature high-pressure gaseous working medium into the inlet of the compressor, and continuing to compress to finish the subsequent process.
4. A method for cooling a motor rotor of a high-speed magnetic levitation motor direct-drive heat pump compressor according to claim 1,
When the temperature at the outlet of the heat pump compressor is greater than or equal to 50 ℃, the temperature at the outlet of the heat pump compressor is greater than the temperature of a motor rotor in the heat pump compressor;
The cooling mechanism comprises a motor cooling inlet, a motor cooling outlet and a preheater, the preheater is arranged between the pressure reducing valve and the evaporator, the preheater is connected with the compressor and the motor cooling inlet, and the motor cooling outlet is connected with the inlet of the heat pump compressor and the motor rotor of the heat pump compressor;
The specific cooling process is as follows:
The high-temperature high-pressure gaseous working medium led out from the outlet of the heat pump compressor exchanges heat with the low-temperature low-pressure gas-liquid mixed working medium led out from the pressure reducing valve in the preheater;
The high-temperature high-pressure gaseous working medium subjected to heat exchange is changed into a high-temperature high-pressure gaseous working medium, and then the high-temperature high-pressure gaseous working medium is introduced into the motor through the cooling air inlet of the motor to cool the motor rotor;
And introducing the cooled low-temperature high-pressure gaseous working medium into an inlet of the heat pump compressor, and continuing to compress to finish the subsequent process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410309376.4A CN118100524A (en) | 2024-03-19 | 2024-03-19 | Method for cooling motor rotor of high-speed magnetic levitation motor direct-drive heat pump compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410309376.4A CN118100524A (en) | 2024-03-19 | 2024-03-19 | Method for cooling motor rotor of high-speed magnetic levitation motor direct-drive heat pump compressor |
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| Publication Number | Publication Date |
|---|---|
| CN118100524A true CN118100524A (en) | 2024-05-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410309376.4A Pending CN118100524A (en) | 2024-03-19 | 2024-03-19 | Method for cooling motor rotor of high-speed magnetic levitation motor direct-drive heat pump compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118100524A (en) |
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- 2024-03-19 CN CN202410309376.4A patent/CN118100524A/en active Pending
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