EP3147507A1 - Drehkolbenverdichter für eine wärmepumpe - Google Patents

Drehkolbenverdichter für eine wärmepumpe Download PDF

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Publication number
EP3147507A1
EP3147507A1 EP15382463.6A EP15382463A EP3147507A1 EP 3147507 A1 EP3147507 A1 EP 3147507A1 EP 15382463 A EP15382463 A EP 15382463A EP 3147507 A1 EP3147507 A1 EP 3147507A1
Authority
EP
European Patent Office
Prior art keywords
compressor
working fluid
service
pipe
heat pump
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.)
Withdrawn
Application number
EP15382463.6A
Other languages
English (en)
French (fr)
Inventor
Ruben CUELLO COLLADO
Jose Antonio Ruiz Bermejo
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.)
BSH Hausgeraete GmbH
BSH Electrodomesticos Espana SA
Original Assignee
BSH Hausgeraete GmbH
BSH Electrodomesticos Espana SA
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 BSH Hausgeraete GmbH, BSH Electrodomesticos Espana SA filed Critical BSH Hausgeraete GmbH
Priority to EP15382463.6A priority Critical patent/EP3147507A1/de
Publication of EP3147507A1 publication Critical patent/EP3147507A1/de
Withdrawn legal-status Critical Current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
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • 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
    • F04C2240/80—Other components
    • 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
    • F04C2240/80—Other components
    • F04C2240/806—Pipes for fluids; Fittings therefor

Definitions

  • the invention relates to a rotary compressor for a heat pump of a household appliance wherein the compressor comprises a low pressure inlet for a working fluid, a high pressure outlet for the working fluid, and a service inlet for charging or filling the working fluid into the heat pump.
  • the invention is particularly useful for clothes dryers.
  • heat pumps of household clothes dryers typically comprise - in that order - a compressor, a condenser, an expansion valve, and an evaporator which are connected by respective connection pipings to form a circuit.
  • the circuit is filled or charged with working fluid and may thus also be called a "working fluid circuit".
  • heat pumps have a dedicated pipe (called a service pipe) that is brazed to one of the connection pipings of the working fluid circuit between the high pressure outlet of the compressor and the expansion valve. The additional brazing may create additional points of leakage.
  • brazed joints of the piping may suffer from deformations during its assembly process, especially during a helium leakage test, at a vacuum station, during charging of refrigerant, and during sealing of the service pipe. These deformations increase the risk of leakages and of generating noise in the pipes.
  • brazing material comprising copper (Cu) with a certain content of silver (Ag) is used which achieves a higher ductility but increases costs compared to joints not requiring silver.
  • the desire to use piping with pipes having a lower external diameter as a cost saving measure makes it more difficult to add the service pipe.
  • the external diameter of the service pipe is 6 mm. If the external diameter of the service pipe near or equal to the external diameter of the pipes of the connection piping to which it is to be joined, it is required to drill up to 50% of the available surface of the connection piping. This results in a small or no penetration of the service pipe into the connection piping which results in a mechanically weak joint. This, in turn, leads to an increased risk of mechanical damage of the joint during operation, either by plastic deformation or as a result of fatigue forces.
  • a tee connector 103 may be used to connect a service pipe 102 to a connection piping 101 a, 101b.
  • the tee connector 103 fluidically connects the service pipe 102 to two separated pipes 101 a and 101b of the piping 101 a, 101b. While pipe 101 a connects to the high pressure outlet of the compressor (not shown), pipe 101b connects to the condenser (not shown). This, however, increases costs and the number of brazed connections (by two) with in turn increased a risk of leakages.
  • a rotary compressor as rolling piston type compressor, for a heat pump of a household appliance
  • the compressor comprises a low pressure inlet (also called suction port) for a working fluid and a high pressure outlet (also called discharge tube or discharge port) for the working fluid, and wherein the compressor further comprises a service inlet for charging the working fluid directly into the compressor.
  • This compressor has the advantage that there is no need for attaching a service pipe to a connection piping of the heat pump. Thus, leakages caused by a respective joint between the service pipe and the connection piping can be avoided.
  • a contact area between the service inlet and the compressor can be leak tested in advance to assembly without further effort since usually compressors are leak tested anyway. This even more reduces a risk of leakages of the working fluid. Additionally, this gives a better match between simulations and empirical tests from a vibration point of view.
  • the household appliance can be a kitchen appliance or a laundry care appliance.
  • the kitchen appliance can be a cooling appliance like a refrigerator or a freezer cabinet.
  • the laundry care appliance can be a laundry drying appliance.
  • the low pressure inlet may in particular be used for connecting a low pressure region of the compressor to a connection piping connecting the low pressure inlet to the evaporator.
  • the high pressure outlet may in particular be used for connecting a high pressure region of the compressor to a connection piping connecting the high pressure outlet to the condenser.
  • a piping may comprise one or more joint pipes.
  • the working fluid may in particular be a refrigerant.
  • the service inlet may be a separately manufactured hollow piece that is fixed to the compressor by welding ensuring leak tightness and thus connects an interior region of the compressor comprising the working fluid with the exterior of the compressor.
  • the service inlet may be manufactured by working, in particular machining, an outer wall of the compressor, for example a top or bottom lid or a lateral wall.
  • the service inlet leads to a high pressure region of the compressor. This gives the advantage that start-up problems can be avoided that would be caused by compressor oil sweeping when filling the working fluid, in particular refrigerant.
  • the service inlet is positioned in a lid or top shell of the compressor.
  • the lid of a rotary compressor usually acts as a wall of a high pressure region of the working fluid in the compressor such that this gives easy access to the high pressure region.
  • the service inlet comprises or is a tube or pipe (in the following also called "service pipe”).
  • service pipe can be joined in an automatic or semi-automatic way to the compressor lid (e.g. in the same way as for a high pressure outlet comprising a discharge pipe), thus avoiding the fully manual pipe-to-pipe brazing of a conventional service pipe.
  • the service pipe may be fixed by brazing to a wall of the compressor.
  • the service pipe is a straight pipe. This gives the advantage that a particularly small amount of material is needed. Also, the service pipe can be provided by simple cutting and does not require any bending. But the service pipe may also be bended to allow a better access directing its free end to a specific position.
  • connection piping is 6 mm or smaller. This also enables a reduction of material.
  • an outer diameter of the service pipe can be 6 mm or smaller. This diameter reduction from a current value of 8 mm can be achieved without regard for the service pipe and enables a particularly large reduction of material.
  • the service pipe comprises copper.
  • Copper has the advantage of being rather ductile such that it can easily be formed (e.g. quenched) to achieve a highly tight sealing to prevent leakage of the working fluid. Also, copper is simple to braze and chemically robust.
  • the service pipe may in particular be made of copper of at least 90%, in particular at least 95%, in particular at least 99%, in particular at least 99.8%.
  • the service pipe may comprise aluminium (Al).
  • Al aluminium
  • the service pipe may in particular be made of aluminium of at least 90%, in particular at least 95%, in particular at least 99%, in particular at least 99.8%.
  • the service pipe penetrates the lid (i.e. protrudes from an inner surface into the interior of the compressor) at least 1 mm. This enables a particularly easy handling of the service pipe during its fixing to the lid.
  • the service pipe has a length outside the compressor of at least 20 mm. This gives the advantage of having enough length to tightly seal the service pipe after filling or charging the heat pump with the working fluid.
  • a household appliance comprising a heat pump having a rotary compressor and a service inlet for charging working fluid into the heat pump wherein the compressor is a compressor as described above.
  • the household appliance can be a kitchen appliance or a laundry care appliance.
  • the kitchen appliance can be a cooling appliance like a refrigerator and/or a freezer cabinet.
  • the laundry care appliance can be a laundry drying appliance.
  • the laundry drying appliance can be a stand-alone clothes dryer or a washing machine / clothes dryer combination.
  • the object is further achieved by a method for filling or charging working fluid into a heat pump of a household appliance comprising a rotary compressor wherein the method comprises charging the working fluid directly into the compressor.
  • the method achieves the same advantages as the compressor and the household appliance and can be evolved in analogy to the compressor and the household appliance.
  • the method comprises charging the working fluid into the compressor through a service pipe into a high pressure region of the compressor wherein the service pipe leads through a wall of the compressor.
  • Fig.1 shows a vertical cross-section of a single stage rotary compressor 1 vertically positioned in the appliance that can be used as a drive of a heat pump 2 of a household appliance in form of, e.g., a laundry dryer 3.
  • a discharge tube or pipe 4 of the compressor 1 acts as a high pressure outlet for a working fluid (refrigerant R).
  • the discharge pipe 4 is connected to an inlet of a condenser 5 via a first copper connection piping 6.
  • An outlet of the condenser 5 is connected to an inlet of an expansion valve 7 via a second copper connection piping 8, and an outlet of the expansion valve 7 is connected to an inlet of an evaporator 9 via a third copper connection piping 10.
  • An outlet of the evaporator 9 is connected to a suction tube or pipe 11 acting as a low pressure inlet of the compressor 1 via a fourth copper connection piping 12.
  • the suction pipe 11 leads to a low pressure region 13 within the compressor 1.
  • the incoming low-pressure refrigerant R is compressed by a compressing section 14 of the compressor 1.
  • the compressing section 14 is driven by a motor 15.
  • the compressed and thus high-pressure refrigerant R flows upwards to a high pressure region 16 of the compressor 1.
  • the high pressure region 16 is capped by a top lid 17.
  • the discharge pipe 4 leads through the lid 17 such that the refrigerant R can flow through the connection piping 6 to the condenser 5.
  • the heat pump 2 comprises a cooling circuit for the refrigerant R composed of the components 1 and 4 to 12.
  • a service inlet in form of a copper service pipe 18 is provided.
  • the service pipe 18 is a straight pipe that leads through a hole in the top lid 17 and is tightly joint to the lid 17 e.g. by brazing. This enables an easy and inexpensive way to attach the service pipe 18, in particular by an automated or semi-automated process.
  • the service pipe 18 (having an outer diameter of the pipe is 6 mm or smaller) penetrates the interior surface of the top lid 17 at least 1 mm and thus leads to the high pressure region 16 of the compressor 1. At the outside of the top lid 17, the service pipe 18 extends or has a length of at least 20 mm. After filling the refrigerant R directly into the compressor 1, this outer section is tightly sealed by quenching, e.g. by tightly crimping, the service pipe 18.
  • the top lid 17 also comprises an electrical connector 19 for the motor 15.
  • Fig.2 shows an oblique cut-out view onto a rotary compressor 21.
  • the rotary compressor 21 is similar to the compressor 1 and may also be used to drive the heat pump 2.
  • the rotary compressor 21 has a lid 22 where the discharge pipe 23 is located centrally and may be a straight pipe to enable an easier fixing. Consequently, the electrical connector 19 is moved off-center.
  • the service pipe 18 is shown in its open, unquenched form.
  • Fig.5 shows lateral view of a rotary compressor 1 horizontally positioned that may also be used to drive the heat pump 2.
  • the rotary compressor 1 has a top lid 22 where the discharge pipe 23 is located centrally, a bottom lid 25 and a lateral wall 24 in which the service pipe 18 is located and may be a bended pipe to enable an easier access.
  • the present invention is not restricted to the described embodiments.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP15382463.6A 2015-09-25 2015-09-25 Drehkolbenverdichter für eine wärmepumpe Withdrawn EP3147507A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15382463.6A EP3147507A1 (de) 2015-09-25 2015-09-25 Drehkolbenverdichter für eine wärmepumpe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15382463.6A EP3147507A1 (de) 2015-09-25 2015-09-25 Drehkolbenverdichter für eine wärmepumpe

Publications (1)

Publication Number Publication Date
EP3147507A1 true EP3147507A1 (de) 2017-03-29

Family

ID=54252233

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15382463.6A Withdrawn EP3147507A1 (de) 2015-09-25 2015-09-25 Drehkolbenverdichter für eine wärmepumpe

Country Status (1)

Country Link
EP (1) EP3147507A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4086538A1 (de) 2021-05-03 2022-11-09 BSH Hausgeräte GmbH Kompressormodul mit mitteln zum kühlen und haushaltsgerät damit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63280885A (ja) * 1987-05-12 1988-11-17 Sanyo Electric Co Ltd 密閉型回転圧縮機
JP2004293446A (ja) * 2003-03-27 2004-10-21 Mitsubishi Electric Corp 密閉型圧縮機
AT9232U1 (de) * 2006-05-22 2007-06-15 Acc Austria Gmbh Kältemittelverdichter
US20090113740A1 (en) 2007-11-06 2009-05-07 Bsh Bosch Und Siemens Hausgeraete Gmbh Dryer with heat pump
US20090139107A1 (en) 2007-11-30 2009-06-04 Bsh Bosch Und Siemens Hausgeraete Gmbh Exhaust air dryer with a heat pump and a first fan
US20100083527A1 (en) 2007-01-15 2010-04-08 BSH Bosch und Siemens Hausgeräte GmbH Condensation dryer comprising a heat pump and method for operating the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63280885A (ja) * 1987-05-12 1988-11-17 Sanyo Electric Co Ltd 密閉型回転圧縮機
JP2004293446A (ja) * 2003-03-27 2004-10-21 Mitsubishi Electric Corp 密閉型圧縮機
AT9232U1 (de) * 2006-05-22 2007-06-15 Acc Austria Gmbh Kältemittelverdichter
US20100083527A1 (en) 2007-01-15 2010-04-08 BSH Bosch und Siemens Hausgeräte GmbH Condensation dryer comprising a heat pump and method for operating the same
US20090113740A1 (en) 2007-11-06 2009-05-07 Bsh Bosch Und Siemens Hausgeraete Gmbh Dryer with heat pump
US20090139107A1 (en) 2007-11-30 2009-06-04 Bsh Bosch Und Siemens Hausgeraete Gmbh Exhaust air dryer with a heat pump and a first fan

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4086538A1 (de) 2021-05-03 2022-11-09 BSH Hausgeräte GmbH Kompressormodul mit mitteln zum kühlen und haushaltsgerät damit

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