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
  • F04D29/00—Details, component parts, or accessories
  • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
  • F04D29/056—Bearings
  • F04D29/057—Bearings hydrostatic; hydrodynamic
• • 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
  • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
  • F04D29/056—Bearings
• • 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
  • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
  • F04D29/051—Axial thrust balancing
  • F04D29/0513—Axial thrust balancing hydrostatic; hydrodynamic thrust bearings
• • 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
  • F04D29/40—Casings; Connections of working fluid
  • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
  • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps

Definitions

• the invention relates to a radial fan for a refrigeration system, wherein the radial fan comprises a motor housing in which a shaft is rotatably mounted, which receives at one end at least one impeller of a compressor which is attached to the motor housing and at least one radial bearing with at least one Axialgaslager, through which the shaft is rotatably mounted in the housing.
• a radial fan for a gas laser comprises between a first and a second radial bearing, in particular radial gas bearing, a motor which is formed by a rotor and a stator.
• a motor which is formed by a rotor and a stator.
• On a shaft of the impeller opposite the Axialgaslager is provided, that is, between the Axialgaslager and the impeller of the engine and the respectively adjacent to the engine arranged radial gas bearings are provided.
• Each of these radial gas bearings and the Axialgaslager is supplied under pressure, a gas, so that a wear-free and maintenance-free bearing of the shaft is given to the housing.
• the invention has for its object to propose a radial fan for a chiller, by which a simple structure and safe operation are possible.
• a radial fan in which at least one channel is provided with a connection for a pressure medium, which opens into a rotor chamber which extends between the impeller and the adjacent thereto radial bearing or Axialgaslager.
• the rotor space in the motor housing of the radial fan adjoins a gas space of the compressor arranged on the motor housing.
• this sealing arrangement has the advantage that a pressure level in the motor housing of the radial fan can be kept low, whereby condensation of a coolant for operating a chiller is prevented and safe operation of the radial bearing and / or Axialgaslagers is guaranteed.
• the axial gas bearing is preferably positioned between a radial bearing assigned to the engine and the impeller.
• the radial bearing is designed as a radial gas bearing.
• the channel in the motor housing preferably leads directly into the rotor space and communicates with the gas space of the compressor facing the impeller, wherein the rotor space also communicates with a working gap between an axial stator and a disk of the axial gas bearing in the direction of the axial gas bearing.
• the at least one axial gas bearing and the radial bearing arranged adjacent thereto are connected by a common rotor space.
• a heating device is preferably provided adjacent to the axial gas bearing or adjacent to the axial gas bearing.
• condensation of a gas or a refrigerant on an active surface of the axial and / or radial gas bearing can be counteracted.
• a heater is operated at a temperature at which the axial and / or radial gas bearing is heated to a temperature which is above a dew point of the gas or the refrigerant at the prevailing pressure.
• the motor housing of the radial blower with the compressor arranged thereon is preferably aligned vertically in an operating state. It is preferably provided a so-called vertical operation.
• the compressor is facing down and the motor housing oriented upward.
• This orientation of the motor housing in a vertical operation also has the advantage that condensation can be reduced or prevented, or in case of condensate formation in a system downtime, the condensate flows down.
• FIG. 1 shows a schematic view of a refrigerating machine
• FIG. 2 shows an inventive radial fan for a refrigerator according to Figure 1
• Figure 3 is a schematically enlarged view of the Axialgaslagers and the connection of the compressor to the motor housing of the radial fan.
• FIG. 1 shows a refrigerating machine 1.
• a cooling medium is moved therein in a closed circuit and thereby transferred successively into different states of matter.
• the gaseous cooling medium is first compressed by a radial blower 11 and passed with a gas pressure line 6 into a compression side 8 of the chiller 1.
• a condenser 3 the cooling medium condenses while releasing heat.
• the liquid cooling medium is guided by means of a liquid pressure line 7 to a throttle 5 and relaxed there.
• the cooling medium expands (evaporates) while absorbing heat at low temperature.
• the evaporator 4 can advantageously be designed as a flooded evaporator 4.
• the radial fan 11 is shown in a longitudinal section.
• the cooling medium of at least one impeller 16, 26 of a compressor 27, in particular Turboradialver emphasizers radially accelerated and compressed in the gas pressure line 6 of the compression side 8 of the chiller 1 out.
• the impeller 16, 26 is seated on a shaft 17, which is driven in the central region of the motor housing 21 by a motor 20.
• This motor consists of a shaft 18 connected to the rotor 18 and a motor housing 21 attached to the stator 19.
• the area, which is seen from the shaft 17 outside of the impeller 16, 26, forms the pressure side of the fan.
• each radial bearing in particular a lower radial gas bearing 22 and an upper radial gas bearing 23, respectively.
• These radial gas bearings 22 include stationary bearing surfaces, which are referred to as radial stator 24.
• the shaft in the region of the radial gas bearings 22, 23 comprises rotating bearing surfaces 25.
• the pressure medium for the gas bearings is advantageously the cooling medium.
• Axialgaslager 31 Between the impeller 16 of the compressor 27 and the lower radial gas bearing 22 Axialgaslager 31 is provided.
• This Axialgaslager 31 includes a rotating disc 32 and adjacent to the disc 32 and at the top and bottom axial stators 34, which each have stationary bearing surfaces 35.
• the disc 32 includes rotating bearing surfaces 36 which are opposed to the stationary bearing surface 35.
• a channel 41 which is connected to the compression side 8 of the refrigerator 1, under the impeller 16. Through this channel 41, the pressurized cooling medium is passed in a gaseous state under the impeller 16 to the Axialgaslager 31st to protect against the entry of particles.
• the rotating bearing surfaces 25 of the radial gas bearing 22 and / or the rotating bearing surfaces 36 of the Axialgaslagers 31 surfaces which include grooves.
• herringbone patterns are provided.
• Such grooves or surface depressions are preferably introduced with an ultrashort pulse laser, in particular a picosecond laser. This allows processing with very short processing times. In addition, this processing step is rework-free and meets the high demands on the precise design.
• the very short laser pulses in the microsecond range result in a direct sublimation of the material.
• a post-processing, in particular burr-free, production of these grooves can be provided.
• an ion beam method is used.
• a micro-machining can be provided.
• the radial fan 11 is vertically aligned in a mounting situation in the refrigerator.
• the compressor 27 are aligned downward and the motor housing 21 aligned vertically upwards.
• the radial blower 11 may advantageously be arranged directly above a flooded evaporator 4, so that if necessary condensate formed at standstill of the chiller 1 back down into the evaporator 4.
• FIG. 3 shows a schematically enlarged view of the axial-gas bearing 31 as well as a connection of the compressor 27 to the motor housing 21 of the radial fan 11.
• the connection of the compressor 27 with the housing 52 to the motor housing 21 of the radial blower 11 takes place without the use of a labyrinth seal or the like.
• the supply of the pressurized cooling medium via the channel 41 is used to prevent entry of particles into the Axialgaslager 31.
• the Axialgaslager 31 itself has such a narrow gap between the bearing surfaces 35 of the stator 34 and the bearing surfaces 36 of the rotating disk 32, that by the Axialgaslager 31 itself a seal between a rotor chamber 46 in the housing 21 and a gas space 49 in the compressor 27 is formed ,
• the rotor chamber 46 is formed in the radial direction between a through hole 47 in the motor housing 21 and the shaft 17 mounted therein.
• the gas space 49 is formed between a housing section 51 of the motor housing 21 or housing 52 of the compressor 27 and the impeller 16.
• a housing 52 of the compressor 27 preferably surrounds the housing section 51 and is connected fixedly to the motor housing 21 outside this housing section 51.
• a pressure port 54 is provided for the pressurized cooling medium, which is the channel 41 is supplied.
• the cooling medium flows mainly in the direction of the gas space 49; in the opposite direction, the gas flow is prevented by the axial bearing 31, which seals the rotor space 46.
• the compressor 27 is preferably designed as a multi-stage compressor or turbocompressor.
• a first stage forms the impeller 26, and the second stage forms the impeller 16.
• the seal between the pressure side of the second stage or the impeller 16 of the compressor 27 and the motor housing 21 of the radial blower 11 take place.
• a lower pressure than on the pressure side of the compressor 27 can be adjusted, whereby condensation of the cooling medium in the radial bearings 22, 23 is prevented.
• the pressure connection 54 may preferably have a filter element. This serves to ensure that no particles enter the compressor 27 and / or the Axialgaslager 31.
• This radial fan 11 may further comprise a heating device 56 in the region of the axial gas bearing 31 or on an axial stator 34 or between the two axial stators 34.
• a heater 56 serves to heat the Axialgaslagers 31 to a temperature which is above the dew point of the cooling medium at an applied pressure. As a result, condensation of the cooling medium can be prevented.
• Such a heater 56 may be formed as an electrically driven heater such as a resistance heater or a PTC element.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=66092319

Family Applications (1)

Country Status (7)

Family Cites Families (17)

• 2018
  • 2018-04-13 DE DE102018108828.0A patent/DE102018108828A1/de active Pending
• 2019
  • 2019-04-02 US US17/047,214 patent/US11333158B2/en active Active
  • 2019-04-02 EP EP19716109.4A patent/EP3775569A1/de active Pending
  • 2019-04-02 CN CN201980025236.1A patent/CN111954763B/zh active Active
  • 2019-04-02 CA CA3096808A patent/CA3096808C/en active Active
  • 2019-04-02 WO PCT/EP2019/058234 patent/WO2019197207A1/de active Application Filing
  • 2019-04-11 TW TW108112687A patent/TWI823924B/zh active

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