EP4269749A1 - Machine à piston rotatif et son utilisation - Google Patents

Machine à piston rotatif et son utilisation Download PDF

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Publication number
EP4269749A1
EP4269749A1 EP22169723.8A EP22169723A EP4269749A1 EP 4269749 A1 EP4269749 A1 EP 4269749A1 EP 22169723 A EP22169723 A EP 22169723A EP 4269749 A1 EP4269749 A1 EP 4269749A1
Authority
EP
European Patent Office
Prior art keywords
gas
rotor
rotors
housing
steam
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
EP22169723.8A
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German (de)
English (en)
Inventor
Gerard Sterz
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP22169723.8A priority Critical patent/EP4269749A1/fr
Priority to DE102023109882.9A priority patent/DE102023109882A1/de
Publication of EP4269749A1 publication Critical patent/EP4269749A1/fr
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C1/00—Rotary-piston machines or engines
    • F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
    • F01C1/12—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type
    • F01C1/126—Rotary-piston machines or engines 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 elements extending radially from the rotor body not necessarily cooperating with corresponding recesses in the other rotor, e.g. lobes, Roots type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/06—Heating; Cooling; Heat insulation
    • 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
    • F04C2210/00—Fluid
    • F04C2210/22—Fluid gaseous, i.e. compressible
    • F04C2210/227—Steam

Definitions

  • the invention relates to a rotary piston engine and in particular to a Roots engine.
  • the invention also relates to a device for reducing a pressurized gas and in particular to a device for expanding a pressurized gas by reducing the pressure while maintaining the volume of the gas to generate mechanical energy using a rotary piston machine, in particular a Roots machine.
  • the invention further relates to systems with such a device and in particular to systems in which the pressurized gas can be water vapor.
  • Pressurized gases are used in a variety of industrial processes.
  • An example of this is a steam circuit with a steam generator, pressure reduction station and the unit that processes the steam.
  • turbomachines are typically used, which provide steam at different pressures at different outlets. However, if there are only small pressure differences, turbomachines are too complex.
  • the object of the invention is to create a rotary piston machine that can be used for both the compression and the expansion of gases at high temperatures, as is the case with water vapor, for example.
  • the rotors which are rotatably arranged in the rotor chamber of the housing, each have a rotor shaft with two or three or even more radially projecting rotor arms.
  • the rotor chamber of the housing in which the at least two rotors are accommodated, has cylindrical inner walls along which the rotors move in a gas-tight manner as they rotate.
  • the rotors are arranged between an inlet opening and an outlet opening of the housing.
  • the bearings for the rotor shafts are located on two housing end walls, while the cylindrical inside of the wall is formed on the inside of a housing peripheral wall between the two housing end walls.
  • two heat shields are arranged in the rotor chamber of the housing, which rest against the housing end walls from the inside. These heat shields protect the bearings located in the housing end walls from excessive heating by hot gases used by the device to generate mechanical energy. Such hot gases are present, for example, in steam cycles in which the temperature of the steam can be 200 ° C and more. If the device were to be equipped without heat shields, there would be a risk that the bearings would suffer thermal damage.
  • the synchronous transmission which is typically arranged outside the rotor chamber, can also be protected from the effects of heat.
  • This synchronous gear ensures that adjacent interlocking rotors rotate in the same opposite direction.
  • the heat shield is fluid-cooled, and the condensate of a water vapor circuit, for example, can be used as the cooling fluid.
  • the condensate is used as a barrier fluid and thus in a certain way as a heat shield for cooling the shaft seals of the rotors.
  • Such shaft seals are known in the prior art; As an example, reference is made here to labyrinth or cooling ring or mechanical ring or floating ring or stuffing box seals
  • each heat shield has cooling channels running through it, which extend between an inlet-side collecting channel and an outlet-side collecting channel and whose shape leads to the same hydraulic pressure conditions.
  • the heat shields have through openings through which the axial ends of the rotor shafts of the rotors extend.
  • the through openings advantageously surround the shaft seals of the rotor shafts.
  • the cooling channels surround the through openings on two opposite sides and extend between the inlet-side collecting channel and the outlet-side collecting channel. Appropriate cooling channel routing ensures that the cooling channels all have the same length or the same hydraulic pressure conditions.
  • the advantage of the invention is the relatively simple and trouble-free design of the rotary piston machine, which is constructed much more simply than, for example, a turbo machine.
  • the rotary piston engine according to the invention has relatively good efficiencies at low pressure conditions, which is not the case with a turbo engine.
  • the speed of the rotors is significantly lower than the speed of the bladed rotor of a turbomachine, which is also extremely complex in design due to its large number of different stator and rotor blades. Due to the heat shields, for example, when choosing the pivot bearings for the rotors, standard components can be rejected because the heat shields are these Protect bearings from the high gas inlet temperatures. Cooling of the bearings is therefore unnecessary and the use of more cost-intensive materials that are temperature-resistant is not necessary.
  • the heat shields not only protect the bearings and the synchronous gear for the rotors but also the shaft seal areas.
  • the processed medium in the case of a steam cycle, water
  • the Roots machine e.g. rotary piston machine and in particular Roots machine
  • the machine uses small pressure differences to generate mechanical energy.
  • the pressure of a medium can be increased by small pressure differences by introducing mechanical energy. In both cases, heat energy is not used to generate mechanical energy during expansion or to realize the pressure difference during compression.
  • the rotational energy that is available on the rotor shaft of at least one of the rotors can expediently be used to operate a generator to generate electricity or also to operate a mechanical system.
  • the rotary piston machine according to the invention can be used for the compression of hot gases by rotating the rotor shaft of one of the rotors by a machine, in particular an electric machine.
  • a shut-off valve can be provided which can be closed quickly if the pressure of the water vapor cannot or may not be reduced by relaxing in the device according to the invention, for example because of safety and security Operation of the system as required.
  • a control valve can also be provided in the parallel connection to the pressure reduction station, and another such control valve can also be part of the pressure reduction station.
  • Such a system can advantageously be a compressor that provides compressed gas for, for example, the operation of a blast furnace.
  • Turbo compressors are typically used as compressors, which, which is also common, are operated with a surge limit control. If such a surge limit control is too sluggish, there is a risk that the compressor will exceed its surge limit, which can lead to the generation of mechanical shocks and pulses, not only within the compressor but also in the downstream system components. This in turn can result in damage to the system.
  • the advantage of the device according to the invention is the relatively simple and trouble-free structure of the rotary piston machine, which is constructed much more simply than, for example, a turbomachine.
  • the device according to the invention has relatively good efficiencies at low pressure conditions, which is not the case with a turbomachine.
  • the speed of the rotors is significantly lower than the speed of the bladed rotor of a turbomachine, which is also extremely complex in design due to its large number of different stator and rotor blades.
  • the heat shields mean that, for example, standard components can be used when choosing pivot bearings for the rotors, as the heat shields protect these bearings from the high gas inlet temperatures. Cooling of the bearings is therefore unnecessary and the use of more cost-intensive materials that are temperature-resistant is not necessary.
  • the heat shields not only protect the bearings and the synchronous gear for the rotors but also the shaft seal areas.
  • the processed medium in the case of a steam cycle, water
  • a rotary piston machine is used to expand the pressurized gas by reducing the pressure and maintaining the volume of the gas, which has at least two interlocking Has rotors which are rotatably mounted in a housing.
  • the two rotors each have a rotor shaft with two or three or even more radially projecting rotor arms.
  • the rotor chamber of the housing in which the at least two rotors are accommodated, has cylindrical inner walls along which the rotors move in a gas-tight manner as they rotate.
  • the rotors are arranged between an inlet opening and an outlet opening of the housing.
  • the bearings for the rotor shafts are located on two housing end walls, while the cylindrical inside of the wall is formed on the inside of a housing peripheral wall between the two housing end walls.
  • Such a rotary piston machine is also referred to as a Roots machine, which is typically used as a compressor.
  • the device according to the invention is an isochoric machine, i.e. a machine that reduces the pressure of the gas but leaves its volume unchanged.
  • two heat shields are arranged in the housing, which rest against the housing end walls from the inside. These heat shields protect the bearings located in the housing end walls from excessive heating by hot gases used by the device to generate mechanical energy. Such hot gases are present, for example, in steam cycles in which the temperature of the steam can be 200 ° C and more. If the device were to be equipped without heat shields, there would be a risk that the bearings would suffer thermal damage.
  • the synchronous transmission which is typically arranged outside the rotor chamber, can also be protected from the effects of heat.
  • This synchronous gear ensures that adjacent interlocking rotors rotate in the same opposite direction.
  • the heat shield is fluid-cooled, and the condensate of a water vapor circuit, for example, can be used as the cooling fluid.
  • the condensate is used as a barrier fluid and thus In a certain way it is used as a heat shield for cooling the shaft seals of the rotors.
  • Such shaft seals are known in the prior art; A labyrinth seal is an example.
  • the rotational energy that is available on the rotor shaft of at least one of the rotors can expediently be used to operate a generator to generate electricity.
  • each heat shield has cooling channels running through it, which extend between an inlet-side collecting channel and an outlet-side collecting channel and whose shape leads to the same hydraulic pressure conditions.
  • the heat shields have through openings through which the axial ends of the rotor shafts of the rotors extend.
  • the through openings advantageously surround the shaft seals of the rotor shafts.
  • the cooling channels surround the through openings on two opposite sides and extend between the inlet-side collecting channel and the outlet-side collecting channel. Appropriate cooling channel routing ensures that the cooling channels all have the same length or the same hydraulic pressure conditions.
  • a shut-off valve can be provided which can be closed quickly if the pressure of the water vapor cannot or may not be reduced by relaxing in the device according to the invention, for example because of safety and security Operation of the system as required.
  • a control valve can also be provided in the parallel connection to the pressure reduction station, and another such control valve can also be part of the pressure reduction station.
  • Such a system can advantageously be a compressor that provides compressed gas for, for example, the operation of a blast furnace.
  • Turbo compressors are typically used as compressors, which, which is also common, are operated with a surge limit control. If such a surge limit control is too sluggish, there is a risk that the compressor will exceed its surge limit, which will lead to the generation of mechanical shocks and pulses not only within the compressor but also in the downstream system components. This in turn can result in damage to the system.
  • Fig. 1 shows schematically a rotary piston engine 10 as a Roots machine, which has a housing 12 with a gas inlet opening 14 and a gas outlet opening 16. There is a rotor chamber 18 between the two openings (see Fig. 2 ).
  • the housing 12 has a housing peripheral wall 20 provided with the two openings and two housing end walls 22. Flanged to one of the two housing end walls 22 is a cover 24 for a synchronous gear 26.
  • a first cross-sectional view through the housing 12 shows Fig. 2 .
  • the inside 34 of the housing peripheral wall 20 is cylindrical.
  • the interlocking rotors provide a gas-tight seal between them, which is also the case on the inside 34 of the housing peripheral wall 20.
  • Minimal clearances are typically provided here, so that the rotors 30 do not directly actuate the inside 34 of the housing peripheral wall 20, but rather move along it with a minimal distance.
  • the synchronous gear 26 can be seen.
  • the shafts 32 of the two rotors 28 are rotatably mounted on the housing end walls 22, which in Fig. 3 is shown at 36.
  • a shaft seal 38 Between the rotor chamber 18 and the pivot bearings 36 there is a shaft seal 38, which can be designed, for example, as a labyrinth seal.
  • two heat shields 40 are used, which are arranged within the rotor chamber 18 on the inside of the housing end walls 22.
  • the two heat shields 40 have through openings 42 for the shafts 32 of the rotors 28. These heat shields 40 are cooled by a fluid and protect the pivot bearings 36 and the synchronous gear 26 from the effects of heat.
  • the shaft seals 38 are located in the through openings 42 (or behind them when viewed from the rotor chamber 18).
  • FIG. 4 A top view of the cooling channel side 44 of a heat shield 40 which faces the housing end walls 22 in the installed state and rests on the inside thereof Fig. 4 .
  • the cooling channel side 44 has two coolant collecting channels 46, 48, between which there are several cooling channels 50, which connect the two collecting channels 46, 48 to one another.
  • the collecting channels 46, 48 and the cooling channels 50 are incorporated as grooves into the cooling channel side 44 of the heat shield 40.
  • a circumferential seal 51 seals the cooling channel side 44 from the inside of the housing end wall 22.
  • the design of the cooling channels 50 is chosen so that the hydraulic conditions in all cooling channels 50 are essentially identical.
  • FIG. 5 An example of an application of the rotary piston engine 10 according to the invention for generating electrical energy by utilizing low differential pressures of gases, in particular water vapor, is shown in Fig. 5 shown.
  • This figure shows a steam circuit 52, in which steam is generated at the pressure P1 in a steam generator 54.
  • This water vapor reaches a water vapor processing unit 58 via a pressure control valve 56, in which the water vapor relaxes and condenses.
  • the condensate reaches a boiler feed pump 64 via the condensate line 60, which brings the condensate to the document P1 and supplies it to the steam generator 54.
  • the rotary piston machine 10 is connected parallel to the pressure control valve 56, which, more generally speaking, is a pressure reduction station, which can be connected upstream of a further pressure control valve 66 and/or to which a pressure control valve 68 can also be connected in parallel. Furthermore, a shut-off valve 70 is provided, which is closed if the pressure reduction of the water vapor required for the operation of the rotary piston engine 10 is not available due to the process.
  • the rotary piston engine 10 drives a generator 72 to convert the pressure difference of the water vapor into electrical energy.
  • the condensate is used to cool the rotary piston engine 10 or the heat shields 40 of the rotary piston engine 10.
  • the shaft seals 38 are also cooled or supplied with barrier medium.
  • the condensate can also be used for this purpose.
  • the condensate behind the boiler feed pump 64 is branched off via a branch line 62 and fed to the two cooling plates of the rotary piston machine 10 and then into the condensate line 60 reach.
  • Pressure control valves 74, 76 can be located in the branch line 62 both in front of and behind the heat shields 40.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
EP22169723.8A 2022-04-25 2022-04-25 Machine à piston rotatif et son utilisation Pending EP4269749A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22169723.8A EP4269749A1 (fr) 2022-04-25 2022-04-25 Machine à piston rotatif et son utilisation
DE102023109882.9A DE102023109882A1 (de) 2022-04-25 2023-04-19 Drehkolbenmaschine und ihre Verwendung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22169723.8A EP4269749A1 (fr) 2022-04-25 2022-04-25 Machine à piston rotatif et son utilisation

Publications (1)

Publication Number Publication Date
EP4269749A1 true EP4269749A1 (fr) 2023-11-01

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ID=81386663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22169723.8A Pending EP4269749A1 (fr) 2022-04-25 2022-04-25 Machine à piston rotatif et son utilisation

Country Status (2)

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EP (1) EP4269749A1 (fr)
DE (1) DE102023109882A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3106381A (en) * 1961-04-26 1963-10-08 Eberspaecher J Turbomachine housing
JPH0367087A (ja) * 1989-08-03 1991-03-22 Sei Okano 空冷式揺動型圧縮機のロータ支承軸軸受防熱及び冷却装置
JPH0717978U (ja) * 1993-08-27 1995-03-31 株式会社島津製作所 ドライ真空ポンプ
DE102013112024A1 (de) * 2013-10-31 2015-04-30 ENVA Systems GmbH Drehkolbengebläse mit einem Dichtsystem
EP3808982A1 (fr) * 2019-10-15 2021-04-21 Ebara Corporation Appareil de pompe à vide

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3106381A (en) * 1961-04-26 1963-10-08 Eberspaecher J Turbomachine housing
JPH0367087A (ja) * 1989-08-03 1991-03-22 Sei Okano 空冷式揺動型圧縮機のロータ支承軸軸受防熱及び冷却装置
JPH0717978U (ja) * 1993-08-27 1995-03-31 株式会社島津製作所 ドライ真空ポンプ
DE102013112024A1 (de) * 2013-10-31 2015-04-30 ENVA Systems GmbH Drehkolbengebläse mit einem Dichtsystem
EP3808982A1 (fr) * 2019-10-15 2021-04-21 Ebara Corporation Appareil de pompe à vide

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Publication number Publication date
DE102023109882A1 (de) 2023-10-26

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