EP3421804B1 - Laundry dryer comprising a heat pump - Google Patents
Laundry dryer comprising a heat pump Download PDFInfo
- Publication number
- EP3421804B1 EP3421804B1 EP17177913.5A EP17177913A EP3421804B1 EP 3421804 B1 EP3421804 B1 EP 3421804B1 EP 17177913 A EP17177913 A EP 17177913A EP 3421804 B1 EP3421804 B1 EP 3421804B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- refrigerant
- compressor
- oil
- sump
- laundry dryer
- 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.)
- Active
Links
- 239000003507 refrigerant Substances 0.000 claims description 74
- 239000003921 oil Substances 0.000 claims description 43
- 239000010687 lubricating oil Substances 0.000 claims description 32
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 238000007598 dipping method Methods 0.000 claims description 2
- 239000002480 mineral oil Substances 0.000 claims description 2
- 235000010446 mineral oil Nutrition 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 1
- 238000000034 method Methods 0.000 description 24
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000005461 lubrication Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 230000000717 retained effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000004512 die casting Methods 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000000748 compression moulding Methods 0.000 description 2
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000010726 refrigerant oil Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
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
- 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
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/02—Lubrication
- F04B39/0223—Lubrication characterised by the compressor type
- F04B39/023—Hermetic compressors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/02—Lubrication
- F04B39/0223—Lubrication characterised by the compressor type
- F04B39/023—Hermetic compressors
- F04B39/0261—Hermetic compressors with an auxiliary oil pump
-
- 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
- F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
- F04C18/356—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member
-
- 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
- F04C2240/809—Lubricant sump
-
- 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
Definitions
- the invention relates to a laundry dryer including a heat pump that includes a compressor for compressing a refrigerant, comprising a housing for containing said refrigerant, a refrigerant pump, said pump disposed within said housing, and a sump for containing an amount of lubricating oil to a predetermined level is defined within said housing separate from said refrigerant pump.
- JP 2009 00 22 87 A is about a compressor.
- This compressor has a bottom section for an oil sump 4 and additionally this bottom section is forming the deepest section. Additionally this compressor has an oil intake port 10 that is arranged right above the deepest section of the oil sump 4.
- JP H10 47267 A relates to a compressor used for air conditioning or refrigeration.
- WO 2011 148453 A1 discloses a two-stage rotary compressor wherein the inner diameter of a cylinder is increased without an increase or with only a slight increase in the outer diameter of the cylinder, so that increase of the size of the compressor is suppressed, and the air volume of the compressor is increased.
- a spring is provided in a high-stage vane chamber of a high-stage compression unit, and a high-stage vane is pushed against a high-stage rolling piston (22) by the force of the spring.
- US 2003 010 573 A1 discloses an oil pickup apparatus for a hermetic compressor connected with a crank shaft in order to pickup an oil filled up in a lower part of a shell, comprising an oil pickup tube having one end immersed in the oil and being connected with the crank shaft to be rotated together, and the oil pickup tube having an impeller portion integrally formed at the oil pickup tube in order to pickup the oil by a centrifugal force when the crank shaft rotates and supply the oil to an upper part of the compressor.
- the publication WO 2016/024009 A1 discloses such compressor and also such heat pump.
- the disclosed compressor is a rotary compressor having a displacement between 5 cm 3 and 10 cm 3 . It may contain a lubricating oil of a type selected from PAG and POE type oils at an amount between 150 cm 3 and 210 cm 3 , and may be dedicated for compressing the refrigerant commonly known as R290 or propane.
- the compressor may be included in a heat pump comprising in addition a refrigerant condenser for condensing the refrigerant as compressed by the compressor, thereby releasing heat, a restrictor, particularly a capillary, for reducing an internal pressure of the liquid refrigerant, thereby converting it to a two-phase fluid including both liquid and gas, an evaporator for fully evaporating the refrigerant, thereby absorbing heat.
- the refrigerant is guided through all of these components as detailed in a closed circuit.
- the amount of refrigerant contained in the heat pump may be restricted to 150 g.
- the refrigerant commonly known as R1270 or propylene may be used.
- the heat pump may be comprised in a laundry dryer.
- a compressor as typically dedicated to use in a laundry dryer heat pump uses refrigerant oil in an amount of 120 cm 3 to 350 cm 3 , depending on the displacement of the pump for compressing the refrigerant in the compressor, this displacement being typically from 2 cm 3 to 25 cm 3 .
- a compressor with a displacement of 5,5 cm 3 may require some 120 cm 3 of oil, and a compressor with a displacement of 12,4 cm 3 may require an amount of 210 cm 3 .
- the IEC 60335-2-11 regulation limits the amount of refrigerant to be loaded into a heat pump of a household appliance as a laundry dryer to 150 g for compliance with safety standards.
- refrigerants like R290 and R1270 have considerable solubilities into usual lubrication oils.
- a proper relation between the amount of refrigerant and the amount of oil must be retained; a minimum amount of oil being defined by providing oil at a weight which is around 20 % of the sum of the weights of the oil and the refrigerants at least.
- the pump is understood to comprise, besides the machine for accomplishing the gas compression process for compressing the refrigerant, a motor, in particular an electric motor that drives that machine.
- said means include a solid insert placed within the sump below the level, thereby filling up a considerable portion of the volume defined by the sump and reducing the necessity to use oil in excess of the minimum amount required for mere filling the sump.
- Such insert may be manufactured from any material suitable for being retained in the compressor at the given operating conditions and appropriate for mass production, for example by die-casting. Such material may be a cheap metal like an appropriately selected aluminum alloy or even plastic, and may be added to the compressor within a just slightly modified mass production process.
- alternative methods for die-casting include, depending on the material selected, injection molding, and compression molding, both with using plastic material, and powder metallurgy, forging, and sheet-metal forming, these three with using metal material. It is also noted that the insert may be composed of several components which are put together prior to or upon manufacturing the compressor.
- the said insert is fixed to the pump, or alternatively to the housing, and more specifically to a lower cap of the housing and closing the housing at a bottom side.
- a lower cap may have a semi-spherical or semi-ellipsoidal shape.
- fixing may be accomplished by one of a rivet, a clamp, and a weld.
- the insert is dipping into the sump particularly by being attached to the pump, with also the pump extending below the predetermined level. This may assist for transferring lubricant oil into the pump, and avoid special lubricating means separate from the pump for providing proper lubrication to the pump.
- the insert also allows keeping essentially all other components of the compressor without changes in shape, thus possibly retaining an original and approved design.
- the insert may be applied with a lower cap of the housing that defines the sump at least to a major extent, and that is being left with a shape according to its original design.
- said insert has a volume of more than 50 % of a volume of said sump.
- an insert may be used in a compressor with a diameter of 106 mm, and a sump below a suction tube of the pump extending to 27 mm down from the tube to a spherical cap of the housing, the original sump volume of about 130 cm 3 could be filled with some 70 cm 3 by an insert, leaving a volume of just 60 cm 3 to be filled with lubricating oil.
- a further preferred embodiment of the invention provides that said means include a cap that closes said housing around said sump, and said cap is shaped conformant to components placed within said housing and located above said sump. Accordingly departure is made from shaping such lower cap of a housing simply spherical as may appear to be expedient in view of mechanical strain by the pressure difference across the housing, and a shape is provided that conforms to the components located proximate to the cap within the housing, thus ascertaining a specifically low free volume for containing a liquid as lubricating oil.
- the modified cap may feature the shape adapted in accordance with the invention on its inside only, thereby retaining its external spherical shape and replacing an insert made separately, or it may feature the shape adapted also on its outside. Thereby the manufacturing process may be retained with a minimum of modifications if any.
- the lubricating oil is selected from the group consisting of PAG oil, mineral oil, POE oil, and PVE oil. Particularly preferred may be the oil denoted as PAG-100S.
- the pump has a displacement between 2 cm 3 and 25 cm 3 .
- the amount of lubricating oil is between 30 cm 3 and 120 cm 3 .
- the refrigerant is R290.
- Alternatives to R290 may be R1270 and R32.
- the refrigerant is contained in an amount not exceeding 150 g.
- This embodiment makes specific use of the advantage obtained by reducing the amount of refrigerant dissolved in the lubricating oil, thus retaining a particularly large amount of the refrigerant for operating the heat pump process.
- Such laundry dryer comprising a heat pump may be dedicated to being used in a private household as a household appliance, by drying an amount of wet laundry of some 5 kg to 12 kg during a process time interval of 2 hours to 3 hours.
- the invention may also be applied to a variety of other household appliances including, but not limited to, dishwashers and air conditioners for household use.
- Fig. 1 shows a schematic representation of a laundry dryer 1, the laundry dryer 1 to be understood also as a representative of any household appliance.
- This dryer 1 comprises a rotatable drum 2 for holding laundry 3 to be dried by process air that is conveyed by a process air guide 4 by some blower means not shown for clarity.
- the dryer 1 as shown by Fig. 1 is a tumble dryer 1 specifically dedicated to drying wet laundry 3.
- the dryer may also be understood to be a combination machine dedicated both to washing laundry 3 and drying laundry 3.
- the drum 2 may be permeable by washing suds or rinsing suds, and held in a closed tub which in its turn contains such suds.
- means for entering and removing suds have to be present, as means for allowing the drum 2 to rotate very fast in order to extract suds from the laundry by centrifugation. All of these means are known as such, and are not displayed in Fig. 1 for clarity.
- the process air guide 4 is essentially closed in itself for circulating a flow of process air, thus defining a condensation-type dryer 1 which relies on extracting humidity from the laundry 3 to be dried by heated process air, and cooling process air after saturation with humidity for extracting the humidity by condensation. Subsequently the process air is heated again and recirculated to the laundry 3.
- an open process air guide 4 may also be considered.
- Such open process air guide 4 would have to include some heating means, but would not necessarily include cooling means for extracting humidity from the process air. Rather the saturated process air could simply be vented from the dryer 1. This would define a vented-type dryer 1.
- the innovation to be described subsequently imposes not necessarily a requirement for a specific type of dryer 1. Thus the following description will focus on a condensation-type dryer 1 as a model without any intent or implication to define a limitation.
- the dryer 1 includes a heat pump 5, 6, 7, 8, 9 of the compressor type and implementing a reverse Rankine process to provide cyclic heating and cooling of process air circulating.
- a heat exchanger or heat source and also termed condenser 5 serves to heat process air flowing through by liquefying a circulating refrigerant which is R290 (alternatively R1270 or R32) and present in a total amount of 150 g in accordance with the IEC 60335-2-11 regulation, and another heat exchanger or heat sink and also termed evaporator 6 serves to cool process air flowing through by evaporating the circulating refrigerant.
- the refrigerant circulates within a refrigerant circuit closed in itself.
- the refrigerant enters the evaporator 5 from a restrictor 8 embodied as a capillary or valve and dedicated to reduce the internal pressure of the refrigerant in its liquid phase, thereby creating a dual-phase mixture of liquid and gas, and is fully evaporated in the evaporator 5 by absorbing heat from the process air. Subsequently the gaseous refrigerant passes to the compressor 9 for being compressed to an increased internal pressure, thereby being also heated adiabatically. The compressed gaseous refrigerant then passes to the condenser 6, and is liquefied by releasing heat to the process air. From the condenser 6 the refrigerant returns to the restrictor 8, thereby closing its cycle.
- a restrictor 8 embodied as a capillary or valve and dedicated to reduce the internal pressure of the refrigerant in its liquid phase, thereby creating a dual-phase mixture of liquid and gas, and is fully evaporated in the evaporator 5 by absorbing heat from the process air.
- the compressor 9 now comprises a pump 10 which serves to compressing the refrigerant and includes an electric motor for driving the pump 10 and not shown for clarity, and a housing which encloses all functional components of the compressor 9 and is hermetically sealed.
- the pump 10 may be a rotary pump, and have a displacement between 2 cm 3 and 25 cm 3 .
- a lower bound of the housing 11 is given by a lower cap 12.
- the pump 10 may by partially immersed in the lubricating oil, or some means for sucking lubricating oil from the sump 13 may dip into the sump 13.
- the amount of lubricating oil to be provided in a compressor 9 depends on multiple conditions, some of them being geometric realities like the position of the predetermined level 14 and the geometry of the housing 11 including its lower cap 12 and defining the sump 13, and another being a requirement of providing at least a minimum amount of lubricating oil in relation to the amount of refrigerant in the refrigerant circuit 7. Defining this minimum amount at 20 % to 22 % of the amount of refrigerant which is 150 g, the minimum amount would be 38 g to 42 g, equating for PAG-100S type oil 38 cm 3 to 42 cm 3 .
- compressors 9 In usual practice of designing compressors 9 however the specified minimum amount will be grossly exceeded, by requiring lubricating oil in amounts of 130 cm 3 or even 250 cm 3 . Taking now into account that a considerable amount of refrigerant will be dissolved in the lubricating oil, in particular to some 30 % of the amount of the oil, it follows that a heat pump 5, 6, 7, 8, 9 including such compressor 9 may face a problem in view of the limited total amount of refrigerant. With the data presented above, this may be a quantity from 40 g of refrigerant at 120 g of oil to even 60 g of refrigerant at 200 g of oil.
- the present innovation provides for reducing dissolution of refrigerant into lubricating oil by reducing the amount of oil to be provided in a compressor 9. According exemplary solutions are shown in Figures 2 to 11 .
- Fig. 2 shows a lower part of a compressor 9 including the pump 10 placed in the housing 11.
- the housing 11 is essentially cylindrical and terminates in a lower cap 12 inserted into and fixed to the housing's 11 cylindrical portion.
- the lower cap 12 bulges outside slightly in order to accommodate the operational pressure difference between the inside and the outside of the housing 11.
- the compressor 9 also includes an insert 15 made of die-cast material and fixed, in this case bolted, to the pump 10. With the pump 10 this insert 15 will dip into the sump 13 formed in the lower part of the housing 11, and thus allow for providing a much lower amount of lubricating oil in the sump 13 for reaching a predetermined level 14.
- the insert 15 has a volume of more than 50 % of a volume of said sump 13, as may be inferred from Fig 2 easily.
- the insert 15 is used in a compressor 9 with a diameter of 106 mm, and a sump 13 below a suction tube 16 of the pump 10 extending to 27 mm down from the tube to the lower cap 12. Thereby the original sump volume of about 130 cm 3 may even be filled with some 70 cm 3 by the insert 15, leaving a volume of just 60 cm 3 to be filled with lubricating oil.
- insert 15 alternative methods for die-casting include, depending on the material selected, injection molding, and compression molding, both with using plastic material, and powder metallurgy, forging, and sheet-metal forming, these three with using metal material. It is also noted that the insert 15 may be composed of several components which are put together prior to or upon manufacturing the compressor 9.
- Fig. 3 The configuration of Fig. 3 is much similar to the configuration of Fig. 2 except for the insert 15 being riveted to the lower cap 12 by rivets 19.
- Fig. 4 is much similar to the configuration of Fig. 2 except for the insert 15 being press-fitted to the cylindrical portion of the housing 11 below the pump 10.
- the insert 15 is fitted to the lower cap 12 which in its turn is fixed to the cylindrical portion of the housing 11 by a circumferential weld 18.
- a rim portion of the lower cap 12 is bent inwards somewhat for forming a clamp 21 that fixes the insert 15 to the lower cap 12.
- the insert 15 has a spring element 17 which fixes it to the lower cap 12.
- the lower cap 12 is again fixed to the cylindrical portion of the housing 11 by a weld 18.
- the insert 15 is made from metal that can be welded, and is fixed to the circumference of the lower cap 12 by a weld 18.
- the insert 15 is made by molding from a suitable plastic material.
- the insert 15 is molded around a metal ring 20, which in its turn is fixed to the lower cap 12 by a circumferential weld 18.
- the insert 15 is formed directly within the lower cap 12, and concurrently bonded to the lower cap 12, by molding. It is noted that by providing the insert 15 directly on its inside the lower cap 12 features the shape adapted in accordance with the invention on its inside only, thereby retaining its external spherical shape. Thereby the functional features of the cap as regards resistance to operational pressure differences and manufacturing process are retained with a minimum of modifications.
- the combination of the lower cap 12 and the insert 15 is shaped towards the inside of the housing 11 conformant to components including the pump 10 and the suction pipe 16 placed within the housing 11, and located above the sump 13.
- this feature is implemented in a different manner by replacing the original spherical lower cap 12 by a novel lower cap 12a which may be manufactured from sheet stock as the lower cap 12 in the embodiments described hereinabove but which is shaped in its entirety conformant to the components including in the present case a lower flange 22 surrounding the suction tube 16 and a shaft 23 placed within the housing 12 and located above the sump 13.
- a general advantage of all embodiments is the reduction of amount of refrigerant dissolved in the lubricating oil, thus saving considerable amounts of refrigerant for performing the heat pump process. This provides for an increased mass flow through the heat pump 5, 6, 7, 8, 9 (see Fig. 1 ), and thus for improved performance.
- the amount of refrigerant dissolved in the lubricating oil of type PAG-100S be reduced to 24 g, in comparison to a dissolved amount of 63 g in a heat pump of equal construction and dimensions except for replacing the innovative compressor 9 by a conventional one.
- the reason is that by using an insert 15 as disclosed herein the total amount of lubricating oil to be provided in the compressor 9 could be reduced from 210 g to 80 g.
- the invention provides for a laundry dryer including a heat pump, wherein a particularly high fraction of the total amount of the refrigerant is available for performing the heat pump process. This is of particular importance to a flammable refrigerant like R290, R1270, and R32, and used in a heat pump of a household appliance wherein the total amount of refrigerant is limited due to pertinent regulation, such as 150 g of refrigerant as allowed by the IEC 60335-2-11 regulation.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
Description
- The invention relates to a laundry dryer including a heat pump that includes a compressor for compressing a refrigerant, comprising a housing for containing said refrigerant, a refrigerant pump, said pump disposed within said housing, and a sump for containing an amount of lubricating oil to a predetermined level is defined within said housing separate from said refrigerant pump.
-
JP 2009 00 22 87 A oil sump 4 and additionally this bottom section is forming the deepest section. Additionally this compressor has anoil intake port 10 that is arranged right above the deepest section of theoil sump 4. -
JP H10 47267 A -
WO 2011 148453 A1 discloses a two-stage rotary compressor wherein the inner diameter of a cylinder is increased without an increase or with only a slight increase in the outer diameter of the cylinder, so that increase of the size of the compressor is suppressed, and the air volume of the compressor is increased. A spring is provided in a high-stage vane chamber of a high-stage compression unit, and a high-stage vane is pushed against a high-stage rolling piston (22) by the force of the spring. -
US 2003 010 573 A1 discloses an oil pickup apparatus for a hermetic compressor connected with a crank shaft in order to pickup an oil filled up in a lower part of a shell, comprising an oil pickup tube having one end immersed in the oil and being connected with the crank shaft to be rotated together, and the oil pickup tube having an impeller portion integrally formed at the oil pickup tube in order to pickup the oil by a centrifugal force when the crank shaft rotates and supply the oil to an upper part of the compressor. - The publication
WO 2016/024009 A1 discloses such compressor and also such heat pump. The disclosed compressor is a rotary compressor having a displacement between 5 cm3 and 10 cm3. It may contain a lubricating oil of a type selected from PAG and POE type oils at an amount between 150 cm3 and 210 cm3, and may be dedicated for compressing the refrigerant commonly known as R290 or propane. The compressor may be included in a heat pump comprising in addition a refrigerant condenser for condensing the refrigerant as compressed by the compressor, thereby releasing heat, a restrictor, particularly a capillary, for reducing an internal pressure of the liquid refrigerant, thereby converting it to a two-phase fluid including both liquid and gas, an evaporator for fully evaporating the refrigerant, thereby absorbing heat. The refrigerant is guided through all of these components as detailed in a closed circuit. On purpose of conforming to the standard IEC 60335-2-11 the amount of refrigerant contained in the heat pump may be restricted to 150 g. As an alternative to R290, the refrigerant commonly known as R1270 or propylene may be used. The heat pump may be comprised in a laundry dryer. - A compressor as typically dedicated to use in a laundry dryer heat pump uses refrigerant oil in an amount of 120 cm3 to 350 cm3, depending on the displacement of the pump for compressing the refrigerant in the compressor, this displacement being typically from 2 cm3 to 25 cm3. A compressor with a displacement of 5,5 cm3 may require some 120 cm3 of oil, and a compressor with a displacement of 12,4 cm3 may require an amount of 210 cm3.
- In the case of a flammable refrigerant like R290 and R1270 which are hydrocarbons and R32 which is difluoromethane, the IEC 60335-2-11 regulation limits the amount of refrigerant to be loaded into a heat pump of a household appliance as a laundry dryer to 150 g for compliance with safety standards. In designing a heat pump in accordance with such regulation it has to be taken into account that refrigerants like R290 and R1270 have considerable solubilities into usual lubrication oils. First, a proper relation between the amount of refrigerant and the amount of oil must be retained; a minimum amount of oil being defined by providing oil at a weight which is around 20 % of the sum of the weights of the oil and the refrigerants at least. For 150 g of refrigerant this calls for a minimum amount of oil at some 40 g. Second, the lower portion of a closed compressor housing that defines a sump for containing the lubrication oil must be filled to an appropriate level, for ascertaining proper lubrication of the pump in operation. This however increases the amount of lubricating oil in the compressor much above the specified minimum level, to 120 g or even more (assuming a specific weight of usual oil at or near 1 g/cm3, as with conventional PAG-100S oil).
- In addition to the two criteria specified previously it must also be considered that a considerable amount of refrigerant will be dissolved in the lubricating oil, in particular to some 30 % of the mass of the oil. Such amount of dissolved refrigerant is no more available for circulation through the heat pump. With the data presented above, this may be a quantity from 40 g of refrigerant at 120 g of oil to even 60 g of refrigerant at 200 g of oil. It follows that under limitation of the total amount of refrigerant to 150 g, operational conditions for the heat pump will be considerably affected by dissolution of refrigerant into the lubricating oil.
- Accordingly, it is an object of the invention to overcome the disadvantages of the prior art as detailed above, and provide a laundry dryer comprising a heat pump with a compressor with improved requirements for lubricating oil, in particular for applications which require the use of a flammable refrigerant like R290 and R1270 in a limited amount.
- According to the invention this object is achieved by a laundry dryer in accordance with the independent claim attached. Preferred yet facultative embodiments of the invention are defined in the dependent claims and exhibited in the drawing attached. Preferred embodiments of the compressor imply preferred embodiments of the heat pump and vice versa, even if not shown or described herein in detail.
- In accordance with the invention attention is given to properties of the compressor which influence the amount of lubricating oil necessary for ascertaining proper lubrication. Special care is applied to effectively reduce the amount of oil that needs to be present for the purpose, in order to limit the amount of refrigerant dissolved in the oil and enable use of a maximum amount of refrigerant for the heat pump operation intended.
- In the present context the pump is understood to comprise, besides the machine for accomplishing the gas compression process for compressing the refrigerant, a motor, in particular an electric motor that drives that machine.
- According to the invention said means include a solid insert placed within the sump below the level, thereby filling up a considerable portion of the volume defined by the sump and reducing the necessity to use oil in excess of the minimum amount required for mere filling the sump. Thereby the mass of oil that could dissolve the refrigerant instead of allowing it to circulate through the heat pump is reduced, thus allowing an increased portion of the total for operating the heat pump. Such insert may be manufactured from any material suitable for being retained in the compressor at the given operating conditions and appropriate for mass production, for example by die-casting. Such material may be a cheap metal like an appropriately selected aluminum alloy or even plastic, and may be added to the compressor within a just slightly modified mass production process.
- As to manufacturing the insert, alternative methods for die-casting include, depending on the material selected, injection molding, and compression molding, both with using plastic material, and powder metallurgy, forging, and sheet-metal forming, these three with using metal material. It is also noted that the insert may be composed of several components which are put together prior to or upon manufacturing the compressor.
- According to more preferred embodiments of the invention the said insert is fixed to the pump, or alternatively to the housing, and more specifically to a lower cap of the housing and closing the housing at a bottom side. Such lower cap may have a semi-spherical or semi-ellipsoidal shape. Even more preferred, such fixing may be accomplished by one of a rivet, a clamp, and a weld.
- According to the invention, the insert is dipping into the sump particularly by being attached to the pump, with also the pump extending below the predetermined level. This may assist for transferring lubricant oil into the pump, and avoid special lubricating means separate from the pump for providing proper lubrication to the pump.
- Applying the insert also allows keeping essentially all other components of the compressor without changes in shape, thus possibly retaining an original and approved design. In particular the insert may be applied with a lower cap of the housing that defines the sump at least to a major extent, and that is being left with a shape according to its original design.
- According to another preferred embodiment of the invention said insert has a volume of more than 50 % of a volume of said sump. As an example, an insert may be used in a compressor with a diameter of 106 mm, and a sump below a suction tube of the pump extending to 27 mm down from the tube to a spherical cap of the housing, the original sump volume of about 130 cm3 could be filled with some 70 cm3 by an insert, leaving a volume of just 60 cm3 to be filled with lubricating oil.
- In addition to providing means as an insert, a further preferred embodiment of the invention provides that said means include a cap that closes said housing around said sump, and said cap is shaped conformant to components placed within said housing and located above said sump. Accordingly departure is made from shaping such lower cap of a housing simply spherical as may appear to be expedient in view of mechanical strain by the pressure difference across the housing, and a shape is provided that conforms to the components located proximate to the cap within the housing, thus ascertaining a specifically low free volume for containing a liquid as lubricating oil.
- The modified cap may feature the shape adapted in accordance with the invention on its inside only, thereby retaining its external spherical shape and replacing an insert made separately, or it may feature the shape adapted also on its outside. Thereby the manufacturing process may be retained with a minimum of modifications if any.
- In addition to adapting the shape of the cap as described above it may be contemplated to apply modifications to internal components of the compressor also, to obtain a further reduction of sump volume for containing lubricating oil.
- In accordance with yet another preferred embodiment of the invention the lubricating oil is selected from the group consisting of PAG oil, mineral oil, POE oil, and PVE oil. Particularly preferred may be the oil denoted as PAG-100S.
- In accordance with yet a further preferred embodiment of the invention the pump has a displacement between 2 cm3 and 25 cm3.
- In accordance with still another preferred embodiment of the invention the amount of lubricating oil is between 30 cm3 and 120 cm3.
- In accordance with a preferred embodiment of the invention the refrigerant is R290. Alternatives to R290 may be R1270 and R32.
- In accordance with another preferred embodiment of the invention the refrigerant is contained in an amount not exceeding 150 g. This embodiment makes specific use of the advantage obtained by reducing the amount of refrigerant dissolved in the lubricating oil, thus retaining a particularly large amount of the refrigerant for operating the heat pump process.
- Such laundry dryer comprising a heat pump may be dedicated to being used in a private household as a household appliance, by drying an amount of wet laundry of some 5 kg to 12 kg during a process time interval of 2 hours to 3 hours. As in a laundry dryer the invention may also be applied to a variety of other household appliances including, but not limited to, dishwashers and air conditioners for household use.
- Preferred embodiments of the invention will now be described with reference to the Figures of the drawing attached. In the drawing:
- Fig. 1
- shows schematically a laundry dryer including a heat pump with a compressor;
- Fig: 2
- a first embodiment of a compressor;
- Fig. 3
- a second embodiment of a compressor;
- Fig. 4
- a third embodiment of a compressor;
- Fig. 5
- a fourth embodiment of a compressor;
- Fig. 6
- a fifth embodiment of a compressor;
- Fig. 7
- a sixth embodiment of a compressor;
- Fig. 8
- a seventh embodiment of a compressor;
- Fig. 9
- an eighth embodiment of a compressor;
- Fig. 10
- an example of a compressor not according to the invention; and
- Fig. 11
- another example of a compressor not according to the invention.
-
Fig. 1 shows a schematic representation of alaundry dryer 1, thelaundry dryer 1 to be understood also as a representative of any household appliance. Thisdryer 1 comprises arotatable drum 2 for holding laundry 3 to be dried by process air that is conveyed by aprocess air guide 4 by some blower means not shown for clarity. Thedryer 1 as shown byFig. 1 is atumble dryer 1 specifically dedicated to drying wet laundry 3. Yet the dryer may also be understood to be a combination machine dedicated both to washing laundry 3 and drying laundry 3. In such case thedrum 2 may be permeable by washing suds or rinsing suds, and held in a closed tub which in its turn contains such suds. Of course means for entering and removing suds have to be present, as means for allowing thedrum 2 to rotate very fast in order to extract suds from the laundry by centrifugation. All of these means are known as such, and are not displayed inFig. 1 for clarity. - The
process air guide 4 is essentially closed in itself for circulating a flow of process air, thus defining a condensation-type dryer 1 which relies on extracting humidity from the laundry 3 to be dried by heated process air, and cooling process air after saturation with humidity for extracting the humidity by condensation. Subsequently the process air is heated again and recirculated to the laundry 3. As an alternative an openprocess air guide 4 may also be considered. Such openprocess air guide 4 would have to include some heating means, but would not necessarily include cooling means for extracting humidity from the process air. Rather the saturated process air could simply be vented from thedryer 1. This would define a vented-type dryer 1. The innovation to be described subsequently imposes not necessarily a requirement for a specific type ofdryer 1. Thus the following description will focus on a condensation-type dryer 1 as a model without any intent or implication to define a limitation. - The
dryer 1 includes aheat pump 5, 6, 7, 8, 9 of the compressor type and implementing a reverse Rankine process to provide cyclic heating and cooling of process air circulating. A heat exchanger or heat source and also termed condenser 5 serves to heat process air flowing through by liquefying a circulating refrigerant which is R290 (alternatively R1270 or R32) and present in a total amount of 150 g in accordance with the IEC 60335-2-11 regulation, and another heat exchanger or heat sink and also termed evaporator 6 serves to cool process air flowing through by evaporating the circulating refrigerant. The refrigerant circulates within a refrigerant circuit closed in itself. The refrigerant enters the evaporator 5 from a restrictor 8 embodied as a capillary or valve and dedicated to reduce the internal pressure of the refrigerant in its liquid phase, thereby creating a dual-phase mixture of liquid and gas, and is fully evaporated in the evaporator 5 by absorbing heat from the process air. Subsequently the gaseous refrigerant passes to the compressor 9 for being compressed to an increased internal pressure, thereby being also heated adiabatically. The compressed gaseous refrigerant then passes to the condenser 6, and is liquefied by releasing heat to the process air. From the condenser 6 the refrigerant returns to the restrictor 8, thereby closing its cycle. - The compressor 9 now comprises a
pump 10 which serves to compressing the refrigerant and includes an electric motor for driving thepump 10 and not shown for clarity, and a housing which encloses all functional components of the compressor 9 and is hermetically sealed. Thepump 10 may be a rotary pump, and have a displacement between 2 cm3 and 25 cm3. A lower bound of thehousing 11 is given by alower cap 12. Above thelower cap 12 there is located a sump 13 containing a lubricating oil, in particular an oil of type PAG-100S, applied for lubricating thepump 10 by means not shown in detail for clarity. Within the sump 13 the lubricating oil is contained to apredetermined level 14. In a concrete embodiment thepump 10 may by partially immersed in the lubricating oil, or some means for sucking lubricating oil from the sump 13 may dip into the sump 13. - As elaborated hereinabove the amount of lubricating oil to be provided in a compressor 9 depends on multiple conditions, some of them being geometric realities like the position of the predetermined
level 14 and the geometry of thehousing 11 including itslower cap 12 and defining the sump 13, and another being a requirement of providing at least a minimum amount of lubricating oil in relation to the amount of refrigerant in therefrigerant circuit 7. Defining this minimum amount at 20 % to 22 % of the amount of refrigerant which is 150 g, the minimum amount would be 38 g to 42 g, equating for PAG-100S type oil 38 cm3 to 42 cm3. - In usual practice of designing compressors 9 however the specified minimum amount will be grossly exceeded, by requiring lubricating oil in amounts of 130 cm3 or even 250 cm3. Taking now into account that a considerable amount of refrigerant will be dissolved in the lubricating oil, in particular to some 30 % of the amount of the oil, it follows that a
heat pump 5, 6, 7, 8, 9 including such compressor 9 may face a problem in view of the limited total amount of refrigerant. With the data presented above, this may be a quantity from 40 g of refrigerant at 120 g of oil to even 60 g of refrigerant at 200 g of oil. It follows that under limitation of the total amount of refrigerant to 150 g, operational conditions for theheat pump 5, 6, 7, 8, 9 will be considerably affected by dissolution of refrigerant into the lubricating oil, and no option available for increasing the total amount of refrigerant in theheat pump 5, 6, 7, 8, 9. - Accordingly the present innovation provides for reducing dissolution of refrigerant into lubricating oil by reducing the amount of oil to be provided in a compressor 9. According exemplary solutions are shown in
Figures 2 to 11 . -
Fig. 2 shows a lower part of a compressor 9 including thepump 10 placed in thehousing 11. Thehousing 11 is essentially cylindrical and terminates in alower cap 12 inserted into and fixed to the housing's 11 cylindrical portion. Thelower cap 12 bulges outside slightly in order to accommodate the operational pressure difference between the inside and the outside of thehousing 11. In order to reduce free space above thelower cap 12, the compressor 9 also includes aninsert 15 made of die-cast material and fixed, in this case bolted, to thepump 10. With thepump 10 thisinsert 15 will dip into the sump 13 formed in the lower part of thehousing 11, and thus allow for providing a much lower amount of lubricating oil in the sump 13 for reaching apredetermined level 14. Theinsert 15 has a volume of more than 50 % of a volume of said sump 13, as may be inferred fromFig 2 easily. Theinsert 15 is used in a compressor 9 with a diameter of 106 mm, and a sump 13 below asuction tube 16 of thepump 10 extending to 27 mm down from the tube to thelower cap 12. Thereby the original sump volume of about 130 cm3 may even be filled with some 70 cm3 by theinsert 15, leaving a volume of just 60 cm3 to be filled with lubricating oil. - As to manufacturing the
insert 15, alternative methods for die-casting include, depending on the material selected, injection molding, and compression molding, both with using plastic material, and powder metallurgy, forging, and sheet-metal forming, these three with using metal material. It is also noted that theinsert 15 may be composed of several components which are put together prior to or upon manufacturing the compressor 9. - The configuration of
Fig. 3 is much similar to the configuration ofFig. 2 except for theinsert 15 being riveted to thelower cap 12 byrivets 19. - Also the configuration of
Fig. 4 is much similar to the configuration ofFig. 2 except for theinsert 15 being press-fitted to the cylindrical portion of thehousing 11 below thepump 10. - According to
Fig. 5 , theinsert 15 is fitted to thelower cap 12 which in its turn is fixed to the cylindrical portion of thehousing 11 by acircumferential weld 18. A rim portion of thelower cap 12 is bent inwards somewhat for forming aclamp 21 that fixes theinsert 15 to thelower cap 12. - According to
Fig. 6 theinsert 15 has aspring element 17 which fixes it to thelower cap 12. In its own turn thelower cap 12 is again fixed to the cylindrical portion of thehousing 11 by aweld 18. - According to
Fig. 7 theinsert 15 is made from metal that can be welded, and is fixed to the circumference of thelower cap 12 by aweld 18. - According to
Fig. 8 theinsert 15 is fixed to thelower cap 12 byrivets 19. - According to
Fig 9 theinsert 15 is made by molding from a suitable plastic material. In order to provide for fixing theinsert 15 is molded around a metal ring 20, which in its turn is fixed to thelower cap 12 by acircumferential weld 18. - According to
Fig. 10 theinsert 15 is formed directly within thelower cap 12, and concurrently bonded to thelower cap 12, by molding. It is noted that by providing theinsert 15 directly on its inside thelower cap 12 features the shape adapted in accordance with the invention on its inside only, thereby retaining its external spherical shape. Thereby the functional features of the cap as regards resistance to operational pressure differences and manufacturing process are retained with a minimum of modifications. - As a general feature of all embodiments shown the combination of the
lower cap 12 and theinsert 15 is shaped towards the inside of thehousing 11 conformant to components including thepump 10 and thesuction pipe 16 placed within thehousing 11, and located above the sump 13. - According to
Fig. 11 this feature is implemented in a different manner by replacing the original sphericallower cap 12 by a novel lower cap 12a which may be manufactured from sheet stock as thelower cap 12 in the embodiments described hereinabove but which is shaped in its entirety conformant to the components including in the present case a lower flange 22 surrounding thesuction tube 16 and a shaft 23 placed within thehousing 12 and located above the sump 13. - A general advantage of all embodiments is the reduction of amount of refrigerant dissolved in the lubricating oil, thus saving considerable amounts of refrigerant for performing the heat pump process. This provides for an increased mass flow through the
heat pump 5, 6, 7, 8, 9 (seeFig. 1 ), and thus for improved performance. In a practical case of a heat pump using R290 as the refrigerant in an amount of 150 g, the amount of refrigerant dissolved in the lubricating oil of type PAG-100S be reduced to 24 g, in comparison to a dissolved amount of 63 g in a heat pump of equal construction and dimensions except for replacing the innovative compressor 9 by a conventional one. The reason is that by using aninsert 15 as disclosed herein the total amount of lubricating oil to be provided in the compressor 9 could be reduced from 210 g to 80 g. - Accordingly the invention provides for a laundry dryer including a heat pump, wherein a particularly high fraction of the total amount of the refrigerant is available for performing the heat pump process. This is of particular importance to a flammable refrigerant like R290, R1270, and R32, and used in a heat pump of a household appliance wherein the total amount of refrigerant is limited due to pertinent regulation, such as 150 g of refrigerant as allowed by the IEC 60335-2-11 regulation.
- Reference Numerals
- 1
- Dryer
- 2
- Drum
- 3
- Laundry
- 4
- Process air guide
- 5
- Condenser
- 6
- Evaporator
- 7
- Refrigerant circuit
- 8
- Restrictor
- 9
- Compressor
- 10
- Pump
- 11
- Housing
- 12
- Lower cap
- 12a
- Lower cap, modified
- 13
- Sump
- 14
- Level
- 15
- Insert
- 16
- Suction tube
- 17
- Spring element
- 18
- Weld
- 19
- Rivet
- 20
- Metal ring
- 21
- Clamp
- 22
- Lower flange
- 23
- Shaft
Claims (11)
- Laundry dryer (1) comprising a heat pump (5, 6, 7, 8, 9),
wherein the heat pump includes a refrigerant evaporator (6), a compressor (9), a refrigerant condenser (5), and a refrigerant restrictor (8), all connected in series within a closed loop (7) containing a refrigerant for circulation, wherein said compressor (9) is a compressor (9) for compressing the refrigerant, comprising a housing (11) for containing said refrigerant, a refrigerant pump (10), said pump (10) disposed within said housing (11), characterized in that
the compressor (6) comprises a sump (13) for containing an amount of lubricating oil to a predetermined level (14) defined within said housing (11) separate from said refrigerant pump (10),
wherein said housing (11) includes means (15, 12a) for reducing the amount of lubricating oil contained in said sump (13) while maintaining said level (14),
wherein said means (15, 12a) include a solid insert (15) placed within said sump (13) below said level (14),
wherein said insert (15) is dipping into the sump. - Laundry dryer (1) according to claim 1, wherein said insert (15) is fixed to said pump (10).
- Laundry dryer (1) according to claim 1, wherein said insert (15) is fixed to said housing (11).
- Laundry dryer (1) according to any of the preceding claims, wherein said insert (15) is fixed by one of a rivet (19), a clamp (21), and a weld (18).
- Laundry dryer (1) according to any of the preceding claims, wherein said insert (15) has a volume of more than 50 % of a volume of said sump (13).
- Laundry dryer (1) according to any preceding claim, wherein said means (15, 12a) include a cap (12a) that closes said housing (11) around said sump (13), and said cap (12a) is shaped conformant to components (10, 16) placed within said housing (11) and located above said sump (13).
- Laundry dryer (1) according to any preceding claim, wherein said lubricating oil is selected from the group consisting of PAG oil, mineral oil, POE oil, and PVE oil.
- Laundry dryer (1) according to any preceding claim, wherein the pump (10) has a displacement between 2 cm3 and 25 cm3.
- Laundry dryer (1) according to claim 9, wherein the amount of lubricating oil is between 30 cm3 and 120 cm3.
- Laundry dryer (1) according to any preceding claim, wherein said refrigerant is a compound selected from the group consisting of R290, R1270, and R32.
- Laundry dryer (1) according to any preceding claim, wherein said refrigerant is contained in an amount not exceeding 150 g.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17177913.5A EP3421804B1 (en) | 2017-06-26 | 2017-06-26 | Laundry dryer comprising a heat pump |
PL17177913T PL3421804T3 (en) | 2017-06-26 | 2017-06-26 | Laundry dryer comprising a heat pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17177913.5A EP3421804B1 (en) | 2017-06-26 | 2017-06-26 | Laundry dryer comprising a heat pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3421804A1 EP3421804A1 (en) | 2019-01-02 |
EP3421804B1 true EP3421804B1 (en) | 2021-04-21 |
Family
ID=59239820
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17177913.5A Active EP3421804B1 (en) | 2017-06-26 | 2017-06-26 | Laundry dryer comprising a heat pump |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3421804B1 (en) |
PL (1) | PL3421804T3 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2024057438A1 (en) * | 2022-09-14 | 2024-03-21 | 三菱電機株式会社 | Compressor, refrigeration cycle device, and method for manufacturing compressor |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1047267A (en) * | 1996-07-29 | 1998-02-17 | Matsushita Refrig Co Ltd | Scroll compressor |
KR100422367B1 (en) * | 2001-07-14 | 2004-03-12 | 삼성광주전자 주식회사 | Oil pickup apparatus for Hermetic compressor |
JP2009002287A (en) * | 2007-06-25 | 2009-01-08 | Panasonic Corp | Hermetic compressor |
JP2011157831A (en) * | 2010-01-29 | 2011-08-18 | Sanden Corp | Fluid machinery |
WO2011148453A1 (en) * | 2010-05-24 | 2011-12-01 | 三菱電機株式会社 | Two-stage rotary compressor and heat pump apparatus |
EP2985466A1 (en) | 2014-08-14 | 2016-02-17 | BSH Electrodomésticos España, S.A. | Rotary compressor, heat pump, and household appliance |
-
2017
- 2017-06-26 EP EP17177913.5A patent/EP3421804B1/en active Active
- 2017-06-26 PL PL17177913T patent/PL3421804T3/en unknown
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
EP3421804A1 (en) | 2019-01-02 |
PL3421804T3 (en) | 2021-11-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN105298802B (en) | Linearkompressor and the refrigerator including the Linearkompressor | |
EP4036406B1 (en) | Sealed system for refrigeration appliance | |
US20170306941A1 (en) | Hermetic compressor and refrigeration device | |
JP2003294325A (en) | Compressor equipment | |
JPWO2008142822A1 (en) | Expander-integrated compressor and refrigeration cycle apparatus including the same | |
EP2657524A1 (en) | Hermetic reciprocating compressor | |
KR980009900A (en) | Hermetic compressor | |
EP3421804B1 (en) | Laundry dryer comprising a heat pump | |
JP2017524870A (en) | Rotary compressor, heat pump, and household equipment | |
CA3137384A1 (en) | Rotary compressor and refrigeration cycle device | |
JP4696530B2 (en) | Fluid machinery | |
JP6204867B2 (en) | Electric compressor | |
KR102320908B1 (en) | Compressors and refrigeration cycle units | |
US11168687B2 (en) | Scroll compressor | |
CN104632621B (en) | Refrigeration system and its rotary compressor | |
KR102106011B1 (en) | Method for controlling linear compressor and refrigerator | |
JP6138625B2 (en) | Hermetic compressor and refrigerator using the same | |
JP2002048066A (en) | Closed compressor | |
KR20070052549A (en) | Compressor having heat pipe | |
KR101300961B1 (en) | Rotary compressor | |
JP2012515873A (en) | Compressors, especially radial piston compressors that use carbon dioxide as refrigerant | |
US1888860A (en) | Compressor | |
JP2016102639A (en) | Rotary type compressor and air conditioner with the same | |
JP6927911B2 (en) | Refrigeration cycle equipment | |
KR20020000799A (en) | Refrigerating system for domestic refrigerating appliances |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20190702 |
|
RBV | Designated contracting states (corrected) |
Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
17Q | First examination report despatched |
Effective date: 20200507 |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
INTG | Intention to grant announced |
Effective date: 20201214 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE PATENT HAS BEEN GRANTED |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602017036971 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: REF Ref document number: 1384920 Country of ref document: AT Kind code of ref document: T Effective date: 20210515 |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG9D |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 1384920 Country of ref document: AT Kind code of ref document: T Effective date: 20210421 |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: MP Effective date: 20210421 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 Ref country code: HR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210721 Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 Ref country code: RS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 Ref country code: NO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210721 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210823 Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210821 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210722 Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602017036971 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 Ref country code: SM Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 Ref country code: MC Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
REG | Reference to a national code |
Ref country code: BE Ref legal event code: MM Effective date: 20210630 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20210721 |
|
26N | No opposition filed |
Effective date: 20220124 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20210626 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20210630 Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20210626 Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20210721 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20210630 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210821 Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20210630 Ref country code: AL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20210630 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO Effective date: 20170626 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20230630 Year of fee payment: 7 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: TR Payment date: 20230619 Year of fee payment: 7 Ref country code: PL Payment date: 20230614 Year of fee payment: 7 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210421 |