EP4163495A1 - Schraubenverdichter - Google Patents

Schraubenverdichter Download PDF

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Publication number
EP4163495A1
EP4163495A1 EP22199891.7A EP22199891A EP4163495A1 EP 4163495 A1 EP4163495 A1 EP 4163495A1 EP 22199891 A EP22199891 A EP 22199891A EP 4163495 A1 EP4163495 A1 EP 4163495A1
Authority
EP
European Patent Office
Prior art keywords
propellers
compressor according
rotor
rotors
delivery
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP22199891.7A
Other languages
English (en)
French (fr)
Inventor
Enso Papi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TmIC Srl Termomeccanica Industrial Compressors
Original Assignee
TmIC Srl Termomeccanica Industrial Compressors
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
Application filed by TmIC Srl Termomeccanica Industrial Compressors filed Critical TmIC Srl Termomeccanica Industrial Compressors
Publication of EP4163495A1 publication Critical patent/EP4163495A1/de
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
    • F04C29/0078—Fixing rotors on shafts, e.g. by clamping together hub and shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/20—Manufacture essentially without removing material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/20—Manufacture essentially without removing material
    • F04C2230/21—Manufacture essentially without removing material by casting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/90—Improving properties of machine parts
    • F04C2230/91—Coating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/20—Rotors

Definitions

  • the screw compressor is a rotary volumetric compressor consisting of two parallel rotors fitted externally with several helical profiles (screws) such that they can engage in each other.
  • the two rotors are housed in a stator consisting of two longitudinally intersecting cylinders, in which the rotors turn with a clearance that cannot be reduced beyond a certain limit.
  • the rotor shafts are supported by rolling bearings, and generally one rotor leads the other by meshing the same helical profiles. Sometimes both can be controlled by a pair of external gears, to reduce the friction otherwise present.
  • the profiles of the screws uncover an intake gap, located at one end of the stator, through which air or gas enters to fill the volume between the profiles up to the maximum extension thereof.
  • the profiles penetrate each other, reduce the volume and compress the gas enclosed therein until the delivery gap is uncovered.
  • the operation of the screw compressor is based on the counter-rotating action of two helical rotors that compress the gas or air taken from the intake duct and bring it towards the delivery duct. During this path the space is reduced and, consequently, the pressure rises.
  • the screw compressor is very popular thanks to the diffusion of the technology of its construction. Many manufacturers and assemblers offer this product in many different variants: single-stage, two-stage for high pressure with and without oil for oil-free applications.
  • the speed of rotation is normally higher than that of the motor to which it is connected due to gearboxes or the ratio of pulleys when a belt is present.
  • the current technology involves the use of metallic materials (spheroidal cast iron or steel) for the production of screws and the correct operation of the compressor is linked to the presence of clearances between the profile of the screws and the screws with the compression chamber.
  • metallic materials spheroidal cast iron or steel
  • the presence of such clearances still leads to a lower efficiency of the machine due to the leakages that bring gas from high-pressure zones (delivery) and lower-pressure zones (intake).
  • the compression ratios can be increased by injection of lubricating oil, which helps both the surfaces of the profiles in contact, which acts as a refrigerant to maintain temperature limits suitable for the materials used, and as a sealing fluid between the elements in relative motion between them.
  • Patent CN1032383 describes propellers with a steel shaft, aluminium body and fibre-filled polyamide coating; this composition of different materials is used to ensure a reduction in the overall weight of the finished body, to take full advantage of the special characteristics of the polymeric materials and also to use a higher-performing lubricating fluid.
  • patent CN107448383A uses water as lubricant and not-filled PEEK (polyether ether ketone) to coat the rotor.
  • PEEK polyether ether ketone
  • the present invention aims to improve the performance of a compressor of this type by using entirely polymeric material for the propellers.
  • An aspect of the present invention concerns a screw compressor having the characteristics of claim 1.
  • the screw compressor according to the present invention comprises two rotors or helical screws, respectively male rotor 2 and female rotor 3 enclosed in a casing 4 inside which they counter-rotate.
  • a gas passes through an intake duct 5 created between the two rotors, and the rotation closes this duct at the intake and the compressed gas is pushed towards a delivery 6.
  • Each rotor includes a rotation shaft 21 and 31 which rotates in the case thanks to special bearings which is surrounded by propellers 22 and 32 which engage with each other.
  • the propellers are made in such a way as to reduce progressively the space between rotors and stator, so that the gas sucked in by the suction duct compresses in the direction of the delivery 6.
  • the two rotors are usually designed with different profiles.
  • the male rotor is usually provided with convex lobes, while the female rotor has usually concave cavities. It is thanks to these characteristics that they are engage on to each other.
  • a special motor supplies the compressor with the necessary supply.
  • the motor is used to impart the rotation to the male rotor, which in turn drives the female rotor.
  • the casing is provided with special bearings that are used to keep the rotors in the correct position. They are located at the ends of both rotors, of which they ensure the uniform rotation and constant balance.
  • intake and discharge valves which regulate the initial recovery and the removal of gas from the compressor.
  • the intake valve opens to allow gas to enter the system, while the discharge valve receives the compressed gas at the end of the process.
  • the propellers 22 and 32 are made of a polymeric material.
  • the central body of the screw in particular the shaft 21 and 31 including external projections, can be produced in a more resistant material and subsequently mechanically connected to the polymeric helical parts.
  • the polymeric propellers can be produced starting from a 3D molding process (e.g. FDM) or from a solid profile.
  • FDM 3D molding process
  • the production process of the propellers can include both the use of FDM (Fused Deposition Modeling) and the mechanical processing of a solid cylinder.
  • 3D molding by means of FDM, has excellent piece finishes and a good production speed, but at the same time, the mechanical and chemical characteristics of the polymer remain unchanged.
  • a further finishing step of the obtained rotor may be necessary, to ensure compliance with the geometric and dimensional tolerances of the piece necessary for the correct operation of the machine, in the transients and at operating speed.
  • the shaft is preferably made with a material different from that of the propellers, for example from a more resistant material, in order to absorb most of the bending load generated by compression and the torque imposed by the motor, minimizing the deformations that could be encountered by using a body made solely starting from the same material.
  • the shafts are mechanically connected to the respective propellers in order to transmit the torque of the motor through a suitable locking system.
  • this system comprises tabs and relative slots made both on the rotor and on the shaft, with a variable number depending on the diameter of the shaft and of the torque value to be transmitted, up to the use of a splined shaft.
  • the coupling between propeller and shaft envisages the presence of contact surfaces designed to resist the forces at play.
  • radial thrusts were taken into account by appropriately calibrating the diametrical coupling between shaft and propeller. From the point of view of the axial thrusts, from delivery towards intake, under operating conditions, means for locking the relative axial displacement between the two parts comprising a projection 211 and 311 on the shaft which fits a groove made in the propeller were created.
  • a locking ring 212 and 312 of the propeller side delivery on each rotor is provided.
  • This system has the task of avoiding both the slippage between screw and shaft during torque transmission, and to prevent the axial translations of the rotor along the shaft in both directions, in relation to the loads generated by the mechanics of the meshing between the two rotors and by the fluid dynamics of the compression process itself, taking into account the expansions at play.
  • the internal stator bodies (rotor case-diametrical seat and delivery and suction planes) of the compressor can be coated with an abradable polymeric film.
  • This film not only reduces the space between rotor and respective cylinder, further decreasing the leakages, but also ensures, in case of contact of the rotor with the above-mentioned surfaces, the formation of a groove, preventing plastic deformation or the breakage of the tooth of the rotor due to excessive overheating caused by the friction of the different materials.
  • the purpose of the polymeric film is also to create a thin "sacrificial" barrier between the rotors and the bodies of the compressor.
  • a suitable polymer that can be used for both male and female screws is PEEK (polyether ether ketone), filled with both long and short fibres, which has the right properties of compatibility both with the shaft and with the processed gases, as well as the mechanical and chemical properties such that it can be subjected to both 3D molding (such as FDM) and traditional mechanical machining, starting from the solid (bar or cylinder) and for geometric finishes.
  • PEEK polyether ether ketone
  • Polyamides as well as polyolefins, suitably functionalised and/or filled with appropriate fillers and fibres, can also be used to obtain the profiles. These polymers must have properties of compatibility with both the processed fluids and the shafts on which they are installed, as well as an adequate affinity among them.
  • a category of polymers suitable for coating stator bodies are fluorinated or perfluorinated compounds, as well as the suitably functionalised polyolefins and polyamides.
  • this coating In addition to a chemical compatibility with the material of the propellers, in order to ensure good adhesion, this coating must also be fully compatible with the temperatures and the processed gases in order to avoid a premature and unwanted deterioration.
  • Sprays, powders or plasma can be used to apply the film.
  • high-performance polymers makes it possible, in the case of oil-injected machines, to use higher-performing refrigerant fluid, as well as to improve the mechanical and functional behaviour in the presence of corrosive and/or aggressive gas components.
  • the polymeric propellers are therefore compatible with:
  • the injected fluid becomes, as far as the compression chamber is concerned, primarily a thermodynamic vector, of temperature reduction in the process, in relation to purely energetic heat balances.
  • the screw compressor of the present invention can comprise lubrication channels 7, accessible from the outside, which transport the suitable lubricant to such mechanical parts such as bearings 71, gears, or seals 73.
  • the chamber where the meshing takes place between the rotors is to be isolated, thus being able to use different fluids for each specific purpose (only refrigerant for rotors or lubricant/refrigerant for other mechanical parts).
  • This insulation is created by placing internal seals between the compression chamber and the bearings.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Separation By Low-Temperature Treatments (AREA)
EP22199891.7A 2021-10-07 2022-10-05 Schraubenverdichter Pending EP4163495A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102021000025589A IT202100025589A1 (it) 2021-10-07 2021-10-07 Compressore a vite.

Publications (1)

Publication Number Publication Date
EP4163495A1 true EP4163495A1 (de) 2023-04-12

Family

ID=79018529

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22199891.7A Pending EP4163495A1 (de) 2021-10-07 2022-10-05 Schraubenverdichter

Country Status (3)

Country Link
US (1) US20230114095A1 (de)
EP (1) EP4163495A1 (de)
IT (1) IT202100025589A1 (de)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0101345A1 (de) * 1982-07-22 1984-02-22 BENDIX France Schraubenkompressor
WO1986005555A1 (en) * 1985-03-15 1986-09-25 Svenska Rotor Maskiner Ab A screw-type rotary machine having at least one rotor made of a plastics material
CN1032383A (zh) 1987-10-09 1989-04-12 瑞典转子机械公司 旋转螺杆压缩机的转子
US20080080996A1 (en) * 2006-09-28 2008-04-03 Kabushiki Kaisha Kobe Seiko Sho Screw rotor
CN107448383A (zh) 2016-05-30 2017-12-08 Lg电子株式会社 涡旋式压缩机
CN108916048A (zh) * 2018-08-23 2018-11-30 中山市捷科能机电科技有限公司 一种耐磨自润滑转子及喷水双螺杆压缩机
CN109177216A (zh) * 2018-07-16 2019-01-11 常熟市虞山镇谢桥悦达五金配件厂 一种螺杆压缩机转子的生产方法
WO2020165689A1 (en) * 2019-02-12 2020-08-20 Atlas Copco Airpower, Naamloze Vennootschap Screw rotor and method for manufacturing such screw rotor
US20200376601A1 (en) * 2018-03-16 2020-12-03 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Method for producing shaped article and shaped article
US20210025386A1 (en) * 2018-03-30 2021-01-28 Hitachi Industrial Equipment Systems Co., Ltd. Screw Rotor and Fluid Machine Body

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0101345A1 (de) * 1982-07-22 1984-02-22 BENDIX France Schraubenkompressor
WO1986005555A1 (en) * 1985-03-15 1986-09-25 Svenska Rotor Maskiner Ab A screw-type rotary machine having at least one rotor made of a plastics material
CN1032383A (zh) 1987-10-09 1989-04-12 瑞典转子机械公司 旋转螺杆压缩机的转子
US20080080996A1 (en) * 2006-09-28 2008-04-03 Kabushiki Kaisha Kobe Seiko Sho Screw rotor
CN107448383A (zh) 2016-05-30 2017-12-08 Lg电子株式会社 涡旋式压缩机
US20200376601A1 (en) * 2018-03-16 2020-12-03 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Method for producing shaped article and shaped article
US20210025386A1 (en) * 2018-03-30 2021-01-28 Hitachi Industrial Equipment Systems Co., Ltd. Screw Rotor and Fluid Machine Body
CN109177216A (zh) * 2018-07-16 2019-01-11 常熟市虞山镇谢桥悦达五金配件厂 一种螺杆压缩机转子的生产方法
CN108916048A (zh) * 2018-08-23 2018-11-30 中山市捷科能机电科技有限公司 一种耐磨自润滑转子及喷水双螺杆压缩机
WO2020165689A1 (en) * 2019-02-12 2020-08-20 Atlas Copco Airpower, Naamloze Vennootschap Screw rotor and method for manufacturing such screw rotor

Also Published As

Publication number Publication date
US20230114095A1 (en) 2023-04-13
IT202100025589A1 (it) 2023-04-07

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