WO2023040184A1 - Dispositif d'étanchéité statique à refroidissement interne résistant aux hautes pressions et hautes températures - Google Patents

Dispositif d'étanchéité statique à refroidissement interne résistant aux hautes pressions et hautes températures Download PDF

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Publication number
WO2023040184A1
WO2023040184A1 PCT/CN2022/076889 CN2022076889W WO2023040184A1 WO 2023040184 A1 WO2023040184 A1 WO 2023040184A1 CN 2022076889 W CN2022076889 W CN 2022076889W WO 2023040184 A1 WO2023040184 A1 WO 2023040184A1
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WO
WIPO (PCT)
Prior art keywords
motor
impeller
temperature
sealing device
outer cover
Prior art date
Application number
PCT/CN2022/076889
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English (en)
Chinese (zh)
Inventor
吴加林
Original Assignee
成都佳灵绿色能源有限责任公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN202111100971.XA external-priority patent/CN114251298A/zh
Priority claimed from CN202122278250.XU external-priority patent/CN216343006U/zh
Application filed by 成都佳灵绿色能源有限责任公司 filed Critical 成都佳灵绿色能源有限责任公司
Publication of WO2023040184A1 publication Critical patent/WO2023040184A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/10—Centrifugal pumps for compressing or evacuating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer

Definitions

  • the invention relates to the technical field of power devices, in particular to a high temperature and high pressure resistant internal cooling static sealing device.
  • a power plant refers to a device that converts mechanical energy into electrical energy or converts electrical energy into mechanical energy; the former refers to turbogenerators and turboexpanders, and the latter refers to various blowers.
  • Compressors such as centrifugal compressors are one A machine that relies on the input of mechanical energy to increase the gas pressure and discharge the gas.
  • the commonly used centrifugal compressor mainly includes two parts: the motor and the impeller of the compressor. When the motor rotates, the impeller will also be higher than the rotation.
  • the gas inlet from the front of the casing enters the impeller inside the casing along the axial direction, and the high-speed rotating impeller accelerates the gas, then decelerates it and changes it into radial motion, so that the kinetic energy is converted into potential energy (pressure) and finally along the radial direction of the impeller. , from the gas outlet pipe of the casing, leaving the compressor for use by the user;
  • This prior art centrifugal compressor has the following problems.
  • a sealing device called a shaft seal is installed between the part of the output shaft of the motor that penetrates the housing and the housing.
  • the sealing device for high-temperature, high-pressure and large-capacity occasions, this It is impossible for the sealing device to completely eliminate the leakage of gas. If the compressed gas is flammable, explosive, toxic and harmful, once leakage occurs, it will cause environmental pollution and seriously damage the health of operators. Therefore, this problem must be solved. Power The device can be well developed and applied.
  • the present invention provides a high temperature and high pressure resistant internally cooled static sealing device, including an impeller mechanical mechanism, a motor and an outer cover, the main shaft of the impeller mechanical mechanism and the motor of the motor Shaft connection, the outer cover at least seals the motor and the motor shaft, the outer cover is provided with an inlet pipe, the low-temperature liquid enters the outer cover through the inlet pipe, cools the motor, absorbs the heat of the motor and turns it into high-temperature steam, enters the impeller mechanical mechanism to participate in the cycle, Thus, the dynamic seal of the bearing of the impeller mechanical mechanism is transformed into a static seal.
  • the impeller mechanism includes an impeller compartment and an impeller located in the impeller compartment, the impeller is fixed on the main shaft, part of the main shaft is located in the outer cover, the low-temperature and high-pressure liquid enters the outer cover through the inlet pipe, and is heated by the fan in the motor shaft. After being pressed, it enters the motor for cooling, and absorbs the heat of the motor to become high-temperature and high-pressure steam. Since the pressure of the high-temperature and high-pressure steam inside the outer cover is greater than the internal pressure of the impeller mechanism, the high-temperature and high-pressure steam enters the interior of the impeller mechanism through the bearing gap on the main shaft, thus realizing the impeller mechanism.
  • Mechanism bearing high temperature and high pressure resistant internal cooling static seal.
  • a shutdown seal which is used to connect the main shaft and the motor shaft, so that the high-temperature and high-pressure steam flows from the motor to the impeller in one direction, and blocks the gas flow from the impeller compartment to the motor in the opposite direction when the impeller mechanical device stops running , to prevent the motor from being heated.
  • a temperature sensor is also included, and the temperature sensor is used to detect the temperature of the stator coil of the motor.
  • a controller is also included.
  • the controller controls the flow of the low-temperature and high-pressure liquid in the inlet pipe through the temperature of the stator coil detected by the temperature sensor. The higher the temperature of the stator coil, the greater the flow of the low-temperature and high-pressure liquid.
  • it also includes a cooling pipeline, which is arranged between the shutdown seal and the rear wall of the impeller compartment.
  • a first thermal insulation layer is also included, and the first thermal insulation layer surrounds the cooling pipeline.
  • a second thermal insulation layer is also included, and the second thermal insulation layer is arranged between the outer cover and the rear wall of the impeller compartment.
  • the inlet pipe is arranged at a position corresponding to the motor shaft on the motor non-power side of the housing.
  • turbomechanical mechanism and its main shaft are enclosed in a housing.
  • the energy is recovered, and all the heat generated by the motor is recovered to the impeller mechanical mechanism, the efficiency of the impeller mechanical mechanism is improved, the temperature of the motor is reduced, the life of the motor is improved, and the energy consumption of the motor is reduced;
  • the present invention can be used in systems ranging from a few kilowatts to hundreds of thousands of kilowatts.
  • Fig. 1 is the schematic diagram of an embodiment of the static sealing device of internal cooling of high temperature and high pressure resistance of the present invention
  • Fig. 2 is a schematic diagram of another embodiment of the high temperature and high pressure resistant internal cooling static sealing device of the present invention.
  • Icons 1-main shaft, 2-impeller mechanism, 3-rear wall, 4-second insulation layer, 5-cooling pipeline, 6-stop seal, 7-bearing seat, 8-coupling, 9-motor, 10-outer cover, 11-inlet pipe, 12-first insulation layer, 13-compression intake pipe, 14-compression exhaust pipe, 15-impeller chamber.
  • connection can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components.
  • the static sealing device of the internal cooling of the high temperature and high pressure resistance includes an impeller mechanism 2, a motor 9 and a closed outer cover 10, and the main shaft 1 of the impeller mechanism is connected to the motor shaft of the motor, The outer cover at least seals the motor and the motor shaft.
  • An inlet pipe is opened on the outer cover. The low-temperature liquid enters the outer cover through the inlet pipe to cool the motor. The heat absorbed by the motor becomes high-temperature steam and enters the impeller mechanical mechanism to participate in circulation, so that the impeller The bearing dynamic seal of the mechanical mechanism is transformed into a static seal.
  • the impeller mechanism includes an impeller compartment 15 and an impeller located in the impeller compartment, the impeller is fixed on the main shaft, part of the main shaft is located in the outer cover, and the low-temperature and high-pressure liquid enters through the inlet pipe.
  • the outer cover is pressurized by the fan (not shown) in the motor shaft and then enters the motor for cooling. It absorbs the heat of the motor and turns it into high-temperature and high-pressure steam.
  • the pressure of the high-temperature and high-pressure steam inside the outer cover is greater than the internal pressure of the impeller mechanism, the high-temperature and high-pressure steam passes through the main shaft The gap of the upper bearing enters the interior of the impeller mechanism, thereby realizing the high temperature and high pressure internal cooling static seal of the impeller mechanism bearing. If there is no such measure, the gas inside the impeller mechanism will leak a lot from the inside to the outside.
  • the sealing device further includes a shutdown seal 6, which is used to communicate with the main shaft and the motor shaft, so that high-temperature and high-pressure steam flows from the motor to the impeller in one direction, blocking the stoppage of the impeller mechanical device. During operation, the gas in the impeller compartment flows in the opposite direction to the motor to prevent the motor from being heated.
  • a shutdown seal 6 which is used to communicate with the main shaft and the motor shaft, so that high-temperature and high-pressure steam flows from the motor to the impeller in one direction, blocking the stoppage of the impeller mechanical device.
  • the gas in the impeller compartment flows in the opposite direction to the motor to prevent the motor from being heated.
  • the sealing device further includes a temperature sensor (not shown) for detecting the temperature of the stator coil of the motor.
  • the sealing device further includes a controller (not shown), the controller controls the flow of the low-temperature and high-pressure liquid in the inlet pipe through the temperature of the stator coil detected by the temperature sensor, the higher the temperature of the stator coil, the higher the temperature of the low-temperature high-pressure liquid The greater the flow.
  • a controller not shown
  • the controller controls the flow of the low-temperature and high-pressure liquid in the inlet pipe through the temperature of the stator coil detected by the temperature sensor, the higher the temperature of the stator coil, the higher the temperature of the low-temperature high-pressure liquid The greater the flow.
  • the sealing device further includes a cooling pipeline 5 arranged between the shutdown seal and the rear wall 3 of the impeller compartment.
  • a first thermal insulation layer 12 is also included, and the first thermal insulation layer surrounds the cooling pipeline.
  • the sealing device further includes a second thermal insulation layer 4 , and the second thermal insulation layer is arranged between the outer casing 10 and the rear wall 3 of the impeller compartment.
  • the inlet pipe on the outer cover is arranged at the position corresponding to the motor shaft on the non-power side of the outer cover, so that the same low-temperature and high-pressure liquid as the working fluid of the impeller mechanical mechanism enters the inside of the motor to The motor is cooled, absorbing the heat of the motor and turning it into high-temperature and high-pressure steam, which flows from the motor side through the bearing gap to the impeller mechanical mechanism in one direction.
  • the sealing device is a semi-closed externally sealed internal cooling turbine, as shown in Figure 1, the sealing device includes an inlet pipe 11 (low temperature inlet pipe or/and low temperature inlet pipe), motor 9 , impeller cabin 15, impeller, main shaft 1, bearing seat 7, shutdown seal 6 and coupling 8, the motor shaft of motor 9 is connected with the main shaft 1 of impeller 2 by coupling 8, and are all fixed on the same rigid base (fixed impeller power machinery, bearing seat and motor chassis), a completely closed outer cover 10 is used to connect the motor 9 with the rear wall 3 of the impeller cabin, and the motor 9 and the bearing seat 7 are all sealed in the outer cover 10 to completely transform the dynamic seal.
  • inlet pipe 11 low temperature inlet pipe or/and low temperature inlet pipe
  • motor 9 impeller cabin 15, impeller, main shaft 1, bearing seat 7, shutdown seal 6 and coupling 8
  • the motor shaft of motor 9 is connected with the main shaft 1 of impeller 2 by coupling 8, and are all fixed on the same rigid base (fixed impeller power machinery, bearing seat and motor chassis)
  • an inlet pipe 11 is provided at the position corresponding to the shaft on the non-power side of the motor of the outer cover 10, and the inlet pipe corresponds to a position in the opposite direction along the motor shaft, and a shaft fan is installed inside the ordinary motor to seal it in the outer cover, and Installed on the other side of the motor with no shaft protruding, the low-temperature and high-pressure liquid that is close to 0 degrees and exactly the same as the working medium of the impeller mechanism enters the closed outer cover from the outer cover 10 through the inlet pipe 11, and is blown by the motor shaft fan after being absorbed.
  • the motor 9 is cooled to the inside of the motor 9.
  • the motor shaft of the motor 9 communicates with the main shaft 1 of the impeller 2 through the shutdown seal 6, and the gas can only flow from the motor 9. It flows in one direction to the side of the impeller 2, and controls the flow rate of the low-temperature gas by detecting the temperature of the stator coil to ensure that the stator coil of the motor 9 works within a specified temperature range.
  • the main shaft 1, the bearing seat 7 and the coupling 8 are made of stainless steel to reduce heat conduction; a heat insulating material (second insulation layer 4) is installed between the outer cover 10 and the rear wall 3, and the rear wall 3 of the entire impeller compartment is covered Sealed with heat insulating material, between the bearing seat 7 and the impeller 2, there is a section of cooling pipeline 5 with heat preservation and shutdown heat insulation function installed outside the shaft.
  • the length of the cooling pipeline is determined according to the working temperature (the higher the working temperature, the The longer the length of the cooling pipeline is, when the working temperature of the whole machine is low, such as lower than 150 degrees, the cooling pipeline 5 may not be used.
  • the cooling pipeline 5 is close to the side of the bearing seat 7, and the shutdown sealing device 6 is installed.
  • the stop seal 6 will block the gas flow from the side of the impeller 2 to the side of the motor 9, preventing the high-temperature gas from the side of the impeller 2 from flowing to the side of the motor 9 to heat the motor 9 to prevent damage to the motor 9;
  • the bearing inside the bearing housing 7 adopts High temperature resistant bearings, lubricated with grease;
  • the electric power line of the motor and the monitoring system line are connected through the glass melting and casting sealing sleeve (aviation joint) installed on the outer cover 10.
  • the sealing device is a carbon dioxide compressor
  • the inlet pressure is 3 MPa
  • the temperature is 390 degrees
  • the exhaust pressure is 3.2 MPa
  • the temperature is 400 degrees
  • the flow rate is 60 kg/s
  • the motor power is 630 kw
  • the motor The efficiency is 0.87
  • the carbon dioxide liquid with a pressure of 3.3 MPa and a temperature of -3 degrees is input into the closed outer cover 10 through the inlet pipe 11, and the carbon dioxide liquid enters After the outer cover 10 evaporates immediately and becomes gas, but the pressure does not change.
  • the impeller mechanism and its main shaft are encapsulated in the outer cover, that is to say, the motor 9, the motor shaft, the impeller mechanism 2, and the main shaft 1 of the impeller mechanism are all sealed in the outer cover
  • the low-temperature and high-pressure liquid enters the outer cover through the inlet pipe and absorbs the heat of the motor to become high-temperature and high-pressure steam. Since the pressure of the high-temperature and high-pressure steam inside the outer cover is greater than that inside the impeller mechanism, the high-temperature and high-pressure steam can only flow from the motor side to the impeller mechanism through the bearing gap. One-way flow on the side, thus realizing the internal cooling of the motor.
  • the sealing device is a fully sealed internal cooling turbine, which is suitable for small power mechanical mechanisms.
  • the sealing device is a fully sealed internally cooled gas compressor, including a compressor body, a main shaft, an outer cover, a motor, a motor shaft, an inlet pipe, a compressed air intake pipe and a compressed exhaust pipe , the gas enters from the compressed intake pipe 13, and is discharged from the compressed exhaust pipe after being compressed.
  • the low-temperature and high-pressure inlet pipe 11 is installed on the rear side of the motor 9, and the low-temperature liquid is input. After the low-temperature liquid enters the sealed outer cover, it absorbs the heat of the motor and evaporates immediately.
  • the sealing device is a fully enclosed internally cooled trifluoromethane high-temperature compressor.
  • the specific structure is shown in Figure 2. Due to technological needs, it is required to increase the trifluoromethane r23 gas at 190 degrees and 1 MPa to 200 degrees 1.2 MPa, the common fully enclosed refrigeration compressor cannot meet the above requirements because the motor cannot bear such a high temperature, so the fully enclosed internal cooling compressor of the present invention is adopted; the compressor body can adopt any compressor (for example, Scroll compressor or scroll compressor), the gas enters from the compression inlet pipe 13, and is discharged from the compression exhaust pipe 14 after being compressed.
  • An inlet pipe 11 is provided at the low temperature and high pressure on the rear side of the motor 9, and the input pressure is 24 degrees below zero.
  • liquid trifluoromethane absorbs the heat of the motor and evaporates immediately after entering the sealed outer cover, and becomes a low-temperature and high-pressure steam. Because its pressure is greater than the pressure at the main shaft inlet end of the compressor body, the gas flows to the compressor in one direction. When the body and liquid evaporate into gas, the heat generated by both the stator and the rotor of the motor will be taken away by cooling, so the motor will be cooled.
  • sealing device of the present invention simplifies complex problems, transforms the moving and rotating seal into a static seal, and the cost can be reduced to a fraction to Few 1/10.

Abstract

L'invention concerne un dispositif d'étanchéité statique à refroidissement interne résistant aux hautes pressions et hautes températures, comprenant un mécanisme mécanique de roue (2), un moteur (9) et une enveloppe externe (10). Une broche (1) du mécanisme mécanique de roue (2) est reliée à un arbre de moteur du moteur (9), l'enveloppe externe (10) entoure au moins le moteur (9) et l'arbre du moteur, l'enveloppe externe (10) est pourvue d'un tuyau d'entrée (11), un liquide à basse température pénètre dans l'enveloppe externe (10) par l'intermédiaire du tuyau d'entrée (11) pour refroidir le moteur (9), et la chaleur absorbée en provenance du moteur (9) se transforme en vapeur à haute température et pénètre dans le mécanisme mécanique de roue (2) pour participer à la circulation, ce qui permet de convertir l'étanchéité dynamique des paliers du mécanisme mécanique de roue (2) en étanchéité statique. Le dispositif d'étanchéité peut abaisser le niveau d'étanchéité, éliminer les échanges par fuites entre gaz internes et externes, et réduire l'utilisation d'une huile d'étanchéité.
PCT/CN2022/076889 2021-09-18 2022-02-18 Dispositif d'étanchéité statique à refroidissement interne résistant aux hautes pressions et hautes températures WO2023040184A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN202111100971.X 2021-09-18
CN202122278250.X 2021-09-18
CN202111100971.XA CN114251298A (zh) 2021-09-18 2021-09-18 耐高温高压的内冷却的静止的密封装置
CN202122278250.XU CN216343006U (zh) 2021-09-18 2021-09-18 耐高温高压的内冷却的静止的密封装置

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WO2023040184A1 true WO2023040184A1 (fr) 2023-03-23

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002064956A (ja) * 2000-08-14 2002-02-28 Ishikawajima Harima Heavy Ind Co Ltd 高速回転電動機とその冷却方法
US20070172363A1 (en) * 2003-04-11 2007-07-26 Pierre Laboube Centrifugal motor-compressor unit
CN104061174A (zh) * 2014-05-30 2014-09-24 高锦启 一种离心式压缩机
CN105351221A (zh) * 2015-12-15 2016-02-24 中国科学院合肥物质科学研究院 一种耐高温高压无泄漏离心式压缩机
CN106286338A (zh) * 2015-06-02 2017-01-04 上海优耐特斯压缩机有限公司 对采用高速电机的离心压缩机泄漏空气进行冷却的结构
CN110513308A (zh) * 2019-09-26 2019-11-29 无锡职业技术学院 一种半封闭式离心压缩机

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002064956A (ja) * 2000-08-14 2002-02-28 Ishikawajima Harima Heavy Ind Co Ltd 高速回転電動機とその冷却方法
US20070172363A1 (en) * 2003-04-11 2007-07-26 Pierre Laboube Centrifugal motor-compressor unit
CN104061174A (zh) * 2014-05-30 2014-09-24 高锦启 一种离心式压缩机
CN106286338A (zh) * 2015-06-02 2017-01-04 上海优耐特斯压缩机有限公司 对采用高速电机的离心压缩机泄漏空气进行冷却的结构
CN105351221A (zh) * 2015-12-15 2016-02-24 中国科学院合肥物质科学研究院 一种耐高温高压无泄漏离心式压缩机
CN110513308A (zh) * 2019-09-26 2019-11-29 无锡职业技术学院 一种半封闭式离心压缩机

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