CN210463636U - Motor cooling system of magnetic suspension centrifugal water chilling unit - Google Patents
Motor cooling system of magnetic suspension centrifugal water chilling unit Download PDFInfo
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- CN210463636U CN210463636U CN201921487085.5U CN201921487085U CN210463636U CN 210463636 U CN210463636 U CN 210463636U CN 201921487085 U CN201921487085 U CN 201921487085U CN 210463636 U CN210463636 U CN 210463636U
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Abstract
The utility model discloses a centrifugal cooling water set motor cooling system of magnetic suspension, including centrifugal compressor, evaporimeter, condenser, choke valve, water-cooling heat exchanger, hydrojet electronic expansion valve, rotor cooling electronic expansion valve. The utility model discloses a magnetic suspension centrifugal compressor motor has a stator cooling channel and a rotor cooling channel, and adopts liquid refrigerant to cool the motor stator; the motor rotor is cooled by adopting the gaseous refrigerant, the refrigerant entering a cooling channel of the motor rotor is ensured to enter the motor in a gaseous state through the water-cooling heat exchanger, the damage of the liquid refrigerant to the motor rotor rotating at a high speed is avoided, meanwhile, the cold quantity of the refrigerant of a rotor cooling loop is recovered through the water-cooling heat exchanger, and the influence of the cooling motor on the refrigerating capacity of the unit is reduced.
Description
Technical Field
The utility model relates to a refrigeration plant field specifically is a centrifugal cooling water set motor cooling system of magnetic suspension.
Background
The centrifugal water chilling unit has a large cooling capacity range and high energy efficiency ratio, is popular in the market at present, and can run without oil due to the magnetic bearing of the magnetic suspension centrifugal compressor, so that an oil film is not formed in a heat exchange system of the unit, thermal resistance loss is avoided, the energy efficiency of the unit system is further improved, an oil circuit is cancelled, the system configuration is simplified, and the running reliability of the system is improved. The centrifugal compressor has high rotating speed, the quality of a motor cooling system during operation is critical to the reliable operation of the compressor, a motor stator of the centrifugal machine can be cooled by refrigerant liquid, and a rotor must be cooled by gaseous refrigerant.
The utility model aims at providing a centrifugal cooling water set motor cooling system of magnetic suspension can guarantee that the inside refrigerated refrigerant of the electric motor rotor that gets into centrifugal compressor is the gaseous state, ensures electric motor rotor safe operation to solve the not enough high problem of fault rate of prior art centrifugal compressor electronic cooling.
In order to achieve the above purpose, the utility model discloses the technical scheme who adopts is:
the utility model provides a centrifugal cooling water set motor cooling system of magnetic suspension which characterized in that: the device comprises a magnetic suspension centrifugal compressor, a condenser, an evaporator, a water-cooling heat exchanger and a gas-liquid separator, wherein the output end of the magnetic suspension centrifugal compressor is connected with the input end of the condenser through a pipeline with a check valve and a ball valve, the output end of the condenser is connected with the input end of the evaporator through a pipeline with a ball valve, the output end of the evaporator is connected with the suction end of the magnetic suspension centrifugal compressor through a pipeline with a ball valve, an angle valve, a filter, an electromagnetic valve and a throttle valve are sequentially communicated and installed in the pipeline between the output end of the condenser and the input end of the evaporator, two bypass pipelines are led out between the filter and the electromagnetic valve, wherein the first bypass pipeline is provided with a liquid injection electronic expansion valve, a drying filter and a ball valve and is communicated with the input end of a cooling, the second bypass pipeline is provided with a rotor cooling electronic expansion valve and communicated to the coolant input end of the water-cooling heat exchanger, the coolant output end of the water-cooling heat exchanger is connected with the input end of the gas-liquid separator through a pipeline, the output end of the gas-liquid separator is communicated with the input end of a compressor motor rotor cooling channel through a pipeline with a dry filter and a ball valve, and the output end of the compressor motor rotor cooling channel is connected with the air suction end of the magnetic suspension centrifugal compressor through a pipeline.
The motor cooling system of the magnetic suspension centrifugal water chilling unit is characterized in that: the balance electromagnetic valve is connected between the air suction end and the output end of the magnetic suspension centrifugal compressor through a pipeline, one end of the hot gas bypass electromagnetic valve is communicated between the condenser and the magnetic suspension centrifugal compressor through a pipeline bypass, and the other end of the hot gas bypass electromagnetic valve is communicated between the evaporator and the throttle valve through a bypass.
The motor cooling system of the magnetic suspension centrifugal water chilling unit is characterized in that: and a pressure sensor, a temperature sensor and a local pressure gauge are arranged on a pipeline between the magnetic suspension centrifugal compressor and the condenser.
The motor cooling system of the magnetic suspension centrifugal water chilling unit is characterized in that: and a pressure sensor, a temperature sensor and a local pressure gauge are arranged on a pipeline between the evaporator and the magnetic suspension centrifugal compressor, and the throttle valve is controlled in a linkage manner based on signals of the pressure sensor, the temperature sensor and the local pressure gauge.
The motor cooling system of the magnetic suspension centrifugal water chilling unit is characterized in that: and a pressure sensor and a temperature sensor are arranged on a pipeline between the water-cooling heat exchanger and the gas-liquid separator, and the rotor is controlled to cool the electronic expansion valve in a linkage manner based on signals of the pressure sensor and the temperature sensor.
The motor cooling system of the magnetic suspension centrifugal water chilling unit is characterized in that: a pressure sensor is installed on a pipeline at the input end of a cooling channel of a motor stator of the compressor, a temperature sensor is installed on a pipeline at the output end of the cooling channel of the motor stator of the compressor, and a liquid spraying electronic expansion valve is controlled in a linkage mode based on signals of the pressure sensor and the temperature sensor.
The utility model discloses a draw forth two-way refrigerant branch road in the refrigerant main loop after the filter, cool off the stator and the rotor of motor respectively, the throttle through hydrojet electronic expansion valve becomes the refrigerant of low temperature low pressure all the way and then gets into the motor stator cooling channel of compressor again and in for motor stator cooling, obtains the superheat degree according to the pressure and the temperature of the motor stator export that detect out, adjusts hydrojet electronic expansion valve's aperture.
The utility model has the advantages that: the utility model discloses in fall into two passageways with centrifugal compressor motor chamber, cool off stator, casing and rotor respectively, make the cooling more accurate, strengthen the cooling effect of motor, guarantee that the motor is under normal operating condition, the stator temperature that makes the centrifugal compressor motor is no longer than 150 ℃, rotor temperature is no longer than 140 ℃, guarantee through water-cooled heat exchanger simultaneously that motor rotor refrigerated refrigerant gets into the motor for the low temperature gaseous state, avoid having the refrigerant liquid drop to get into the motor, cause the liquid to hit and cause the damage to the motor. Meanwhile, part of cold energy of the rotor cooling loop refrigerant is recovered through the water-cooling heat exchanger, and the influence of a cooling motor on the refrigerating capacity of the unit is reduced. The water-cooled heat exchanger utilizes the chilled water entering the evaporator to exchange heat with the refrigerant, so that the pressure of the refrigerant entering the motor cavity can be controlled more easily, and the pressure of the motor cavity is not more than 3.5bar (absolute pressure).
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
As shown in figure 1, the motor cooling system of the magnetic suspension centrifugal chiller comprises a magnetic suspension centrifugal compressor 1, a condenser 5, an evaporator 9, a water-cooling heat exchanger 10 and a gas-liquid separator 11, wherein the output end of the magnetic suspension centrifugal compressor 1 is connected with the input end of the condenser 5 through a pipeline with a check valve 3 and a ball valve, the output end of the condenser 5 is connected with the input end of the evaporator 9 through a pipeline, the output end of the evaporator 9 is connected with the suction end of the magnetic suspension centrifugal compressor 1 through a pipeline with a ball valve, an angle valve 6, a filter 7-1, an electromagnetic valve 4-2 and a throttle valve 8-1 are sequentially communicated and installed in a pipeline between the output end of the condenser 5 and the input end of the evaporator 9, two bypass pipelines are led out between the filter 7-1 and the electromagnetic valve 4-2, wherein the first bypass pipeline, The system comprises a drying filter 7-2 and a ball valve, wherein a first bypass pipeline is communicated with the input end of a cooling channel of a motor stator of the compressor, the output end of the cooling channel of the motor stator of the compressor is communicated with the air suction end of the magnetic suspension centrifugal compressor 1 through a pipeline, a second bypass pipeline is provided with a rotor cooling electronic expansion valve 8-3 and communicated with the coolant input end of a water-cooling heat exchanger 10, the coolant output end of the water-cooling heat exchanger 10 is connected with the input end of a gas-liquid separator 11 through a pipeline, the output end of the gas-liquid separator 11 is communicated with the input end of the cooling channel of the motor rotor of the compressor through a pipeline provided with the drying filter 7-3 and the ball valve, and the.
The magnetic suspension centrifugal compressor further comprises a balance electromagnetic valve 2 and a hot gas bypass electromagnetic valve 4-1, wherein the balance electromagnetic valve 2 is connected between the air suction end and the output end of the magnetic suspension centrifugal compressor 1 through a pipeline, one end of the hot gas bypass electromagnetic valve 4-1 is communicated between the condenser 5 and the magnetic suspension centrifugal compressor 1 through a pipeline bypass, and the other end of the hot gas bypass electromagnetic valve 4-1 is communicated between the evaporator 9 and the throttle valve 8-1 through a bypass.
And a pressure sensor PT1, a temperature sensor TT1 and an on-site pressure gauge PI1 are arranged on a pipeline between the magnetic suspension centrifugal compressor 1 and the condenser 5.
A pressure sensor PT2, a temperature sensor TT2 and an on-site pressure gauge PI2 are arranged on a pipeline between the evaporator 9 and the magnetic suspension centrifugal compressor 1, and the throttle valve 8-1 is controlled in a linkage mode based on signals of the pressure sensor PT2, the temperature sensor TT2 and the on-site pressure gauge PI 2.
A pressure sensor PT3 and a temperature sensor TT3 are arranged on a pipeline between the water-cooled heat exchanger 10 and the gas-liquid separator 11, and the rotor is controlled to cool the electronic expansion valve 8-3 in an interlocking mode based on signals of the pressure sensor PT3 and the temperature sensor TT 3.
A pressure sensor PT4 is installed on a pipeline at the input end of a cooling channel of a stator of a motor of the compressor, a temperature sensor TT4 is installed on a pipeline at the output end of the cooling channel of the stator of the motor of the compressor, and the liquid injection electronic expansion valve 8-2 is controlled in a linkage mode based on signals of the pressure sensor PT4 and the temperature sensor TT 4.
The utility model discloses by magnetic suspension centrifugal compressor 1, evaporimeter 9, condenser 5, angle valve 6, filter 7-1, choke valve 8-1, water-cooling heat exchanger 10, hydrojet electronic expansion valve 8-2, rotor cooling electronic expansion valve 8-3, vapour and liquid separator 11 constitutes, its theory of operation and process as follows.
The circulation flow of the refrigeration system is as follows: the exhaust gas of the magnetic suspension centrifugal compressor 1 enters a shell-and-tube condenser 5, is cooled by cooling water and then condensed into liquid refrigerant, enters an electronic expansion valve 8-1 through a drying filter 7-1 and an electromagnetic valve 4-2 for throttling, enters a falling film shell-and-tube evaporator 9 for evaporation into gaseous refrigerant and returns to the magnetic suspension centrifugal compressor 1. And controlling the opening degree of the throttle valve 8-1 according to the superheat degree of the refrigerant at the outlet of the falling film shell-and-tube evaporator 9.
Liquid spraying and cooling processes of the motor stator: refrigerant liquid is taken from a liquid pipe behind a dry filter 7-1 at the rear end of an outlet of the shell-and-tube condenser 5 to cool a motor stator, and the refrigerant passes through an electronic liquid injection electronic expansion valve 8-2, the dry filter 7-2 and a ball valve in sequence and then enters an inlet of the motor stator to be cooled and then enters an air suction pipe of the compressor. Because the motor stator cooling can contain liquid refrigerant, the liquid-spraying method is adopted, and the refrigerant enters the stator channel for cooling after being throttled and decompressed by the liquid-spraying electronic expansion valve 8-2. The stator outlet pipeline is provided with a temperature sensor TT4 for controlling the opening degree of the liquid jet electronic expansion valve 8-2 according to the temperature, and the stator inlet pipeline is provided with a pressure sensor PT4 for limiting the opening degree of the liquid jet electronic expansion valve 8-2 according to the pressure.
Cooling process of the motor rotor: the motor rotor is required to be cooled by gaseous refrigerant, the pressure of a motor cavity does not exceed 3.5bar (absolute pressure), the refrigerant is subjected to heat exchange with chilled water through a water-cooling heat exchanger 10 to become gaseous refrigerant, and then the gaseous refrigerant passes through a gas-liquid separator 11 to ensure that the refrigerant entering a cooling channel of the motor rotor is completely gaseous, and the flow is that liquid is taken from a refrigerant liquid pipe behind a main path drying filter 7-1 and then enters the cooling channel of the motor rotor through an electronic expansion valve 8-3, the water-cooling heat exchanger 10, the gas-liquid separator 11, the drying filter 7-3 and a ball valve in sequence, and then enters an air suction pipe. The pressure sensor PT3 and the temperature sensor TT3 are arranged at the refrigerant outlet of the water-cooling heat exchanger 10, and the opening degree of the rotor cooling electronic expansion valve 8-3 is controlled according to the actual superheat degree.
A surge protection process: the surge protection is performed by hot gas bypass. The opening and closing of the hot gas bypass electromagnetic valve 4-1 are controlled by setting a proper high-low pressure difference control point. When the differential pressure exceeds the set point, the hot gas bypass solenoid valve 4-1 is opened to discharge hot gas to the evaporator inlet, reducing the condenser pressure to reduce the differential pressure while increasing the refrigeration load to avoid surge.
The utility model discloses can guarantee that cooling electric motor rotor refrigerant is the gaseous state completely, ensure that the motor works in normal temperature state and avoid the refrigerant liquid drop to cause the damage to the rotor of high-speed rotation.
The above embodiments are not limited to the protection scope of the present invention, and all modifications or changes based on the basic idea of the present invention belong to the protection scope of the present invention.
Claims (6)
1. The utility model provides a centrifugal cooling water set motor cooling system of magnetic suspension which characterized in that: the device comprises a magnetic suspension centrifugal compressor, a condenser, an evaporator, a water-cooling heat exchanger and a gas-liquid separator, wherein the output end of the magnetic suspension centrifugal compressor is connected with the input end of the condenser through a pipeline with a check valve and a ball valve, the output end of the condenser is connected with the input end of the evaporator through a pipeline with a ball valve, the output end of the evaporator is connected with the suction end of the magnetic suspension centrifugal compressor through a pipeline with a ball valve, an angle valve, a filter, an electromagnetic valve and a throttle valve are sequentially communicated and installed in the pipeline between the output end of the condenser and the input end of the evaporator, two bypass pipelines are led out between the filter and the electromagnetic valve, wherein the first bypass pipeline is provided with a liquid injection electronic expansion valve, a drying filter and a ball valve and is communicated with the input end of a cooling, the second bypass pipeline is provided with a rotor cooling electronic expansion valve and communicated to the coolant input end of the water-cooling heat exchanger, the coolant output end of the water-cooling heat exchanger is connected with the input end of the gas-liquid separator through a pipeline, the output end of the gas-liquid separator is communicated with the input end of a compressor motor rotor cooling channel through a pipeline with a dry filter and a ball valve, and the output end of the compressor motor rotor cooling channel is connected with the air suction end of the magnetic suspension centrifugal compressor through a pipeline.
2. A magnetic levitation centrifugal chiller motor cooling system as recited in claim 1 wherein: the balance electromagnetic valve is connected between the air suction end and the output end of the magnetic suspension centrifugal compressor through a pipeline, one end of the hot gas bypass electromagnetic valve is communicated between the condenser and the magnetic suspension centrifugal compressor through a pipeline bypass, and the other end of the hot gas bypass electromagnetic valve is communicated between the evaporator and the throttle valve through a bypass.
3. A magnetic levitation centrifugal chiller motor cooling system as recited in claim 1 wherein: and a pressure sensor, a temperature sensor and a local pressure gauge are arranged on a pipeline between the magnetic suspension centrifugal compressor and the condenser.
4. A magnetic levitation centrifugal chiller motor cooling system as recited in claim 1 wherein: and a pressure sensor, a temperature sensor and a local pressure gauge are arranged on a pipeline between the evaporator and the magnetic suspension centrifugal compressor, and the throttle valve is controlled in a linkage manner based on signals of the pressure sensor, the temperature sensor and the local pressure gauge.
5. A magnetic levitation centrifugal chiller motor cooling system as recited in claim 1 wherein: and a pressure sensor and a temperature sensor are arranged on a pipeline between the water-cooling heat exchanger and the gas-liquid separator, and the rotor is controlled to cool the electronic expansion valve in a linkage manner based on signals of the pressure sensor and the temperature sensor.
6. A magnetic levitation centrifugal chiller motor cooling system as recited in claim 1 wherein: a pressure sensor is installed on a pipeline at the input end of a cooling channel of a motor stator of the compressor, a temperature sensor is installed on a pipeline at the output end of the cooling channel of the motor stator of the compressor, and a liquid spraying electronic expansion valve is controlled in a linkage mode based on signals of the pressure sensor and the temperature sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921487085.5U CN210463636U (en) | 2019-09-09 | 2019-09-09 | Motor cooling system of magnetic suspension centrifugal water chilling unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921487085.5U CN210463636U (en) | 2019-09-09 | 2019-09-09 | Motor cooling system of magnetic suspension centrifugal water chilling unit |
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| CN210463636U true CN210463636U (en) | 2020-05-05 |
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| CN201921487085.5U Active CN210463636U (en) | 2019-09-09 | 2019-09-09 | Motor cooling system of magnetic suspension centrifugal water chilling unit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110455002A (en) * | 2019-09-09 | 2019-11-15 | 合肥天鹅制冷科技有限公司 | A kind of magnetic suspension centrifugal refrigerating machines electromotor cooling system |
| US20210207855A1 (en) * | 2020-06-11 | 2021-07-08 | Beijing Baidu Netcom Science And Technology Co., Ltd. | Refrigerating System |
| US20210222923A1 (en) * | 2020-06-11 | 2021-07-22 | Beijing Baidu Netcom Science And Technology Co., Ltd. | Refrigerating system |
| CN113945020A (en) * | 2021-10-19 | 2022-01-18 | 青岛海尔空调电子有限公司 | Control method for centrifugal refrigeration equipment, device and medium |
-
2019
- 2019-09-09 CN CN201921487085.5U patent/CN210463636U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110455002A (en) * | 2019-09-09 | 2019-11-15 | 合肥天鹅制冷科技有限公司 | A kind of magnetic suspension centrifugal refrigerating machines electromotor cooling system |
| US20210207855A1 (en) * | 2020-06-11 | 2021-07-08 | Beijing Baidu Netcom Science And Technology Co., Ltd. | Refrigerating System |
| US20210222923A1 (en) * | 2020-06-11 | 2021-07-22 | Beijing Baidu Netcom Science And Technology Co., Ltd. | Refrigerating system |
| US11781790B2 (en) * | 2020-06-11 | 2023-10-10 | Beijing Baidu Netcom Science And Technology Co., Ltd. | Refrigerating system |
| CN113945020A (en) * | 2021-10-19 | 2022-01-18 | 青岛海尔空调电子有限公司 | Control method for centrifugal refrigeration equipment, device and medium |
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