EP4141355A1 - Appareil de refroidissement et/ou de congélation - Google Patents

Appareil de refroidissement et/ou de congélation Download PDF

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Publication number
EP4141355A1
EP4141355A1 EP22191838.6A EP22191838A EP4141355A1 EP 4141355 A1 EP4141355 A1 EP 4141355A1 EP 22191838 A EP22191838 A EP 22191838A EP 4141355 A1 EP4141355 A1 EP 4141355A1
Authority
EP
European Patent Office
Prior art keywords
refrigerant
expansion unit
porous body
refrigerant line
filter drier
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
EP22191838.6A
Other languages
German (de)
English (en)
Inventor
Jascha Ruebeling
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.)
Liebherr Hausgeraete Ochsenhausen GmbH
Original Assignee
Liebherr Hausgeraete Ochsenhausen GmbH
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
Priority claimed from DE102021128680.8A external-priority patent/DE102021128680A1/de
Application filed by Liebherr Hausgeraete Ochsenhausen GmbH filed Critical Liebherr Hausgeraete Ochsenhausen GmbH
Publication of EP4141355A1 publication Critical patent/EP4141355A1/fr
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/003—Filters

Definitions

  • the present invention relates to a refrigerator and/or freezer with a refrigerant circuit which includes a refrigerant line and in which a condenser and an evaporator located downstream of the condenser are arranged, with at least one expansion unit being arranged upstream of the evaporator, in which the refrigerant flows through is relaxed.
  • Conventional refrigerant circuits of known refrigerators and freezers include a condenser, an evaporator and an expansion unit in the form of a capillary arranged between the condenser and the evaporator. After flowing through the evaporator, the refrigerant reaches the compressor, where it is compressed and conveyed back to the condenser by the compressor.
  • the refrigerant is expanded over a length of several meters from the high to the low pressure of the system and thus from the liquid to the two-phase area of the refrigerant.
  • This capillary which extends several meters and extends downstream from the condenser and upstream from the evaporator, can be thermally exchanged with the suction line of the compressor using an internal heat exchanger, resulting in better cooling capacity of the compressor.
  • a filter drier is arranged upstream of the capillary to dehumidify the refrigerant and filter out foreign particles that could clog the capillary arranged downstream.
  • an expansion unit is used, the special feature of which is that the refrigerant expands over a distance of a few millimeters from high to low pressure, so that extensive adjustments to the previous structure of a refrigerator and / or freezer are required.
  • a porous or an electronic expansion element is used.
  • the invention therefore relates to a refrigerator and/or freezer with a refrigerant circuit, the refrigerant circuit having a refrigerant line for conducting a refrigerant, a compressor for compressing the refrigerant, a condenser for condensing the refrigerant, a filter drier for filtering and dehumidifying the refrigerant, an expansion unit for expanding the refrigerant, and an evaporator for evaporating the refrigerant.
  • the invention is characterized in that the filter dryer and the Expansion unit directly adjacent to each other, with the filter drier being located upstream of the expansion unit.
  • the filter drier is arranged directly in front of the expansion unit, which simplifies the production of the coolant circuit.
  • the filter drier can be preassembled on the expansion unit before the two assembled components are installed in the coolant circuit, in particular in the interior of the coolant line.
  • the two installation steps one installation step for the filter drier and another for connecting the expansion unit
  • the two installation steps that are common in the prior art become just one common installation step.
  • the filter drier is fully integrated into the refrigerant line, preferably in such a way that the filter drier is surrounded by the refrigerant line.
  • the filter drier is inserted or installed inside the refrigerant line such as a refrigerant line pipe.
  • the refrigerant line such as a refrigerant line pipe.
  • the filter drier has the external shape of a rod and can be pushed into the interior of the refrigerant line.
  • the configuration of the filter drier in the form of a rod is particularly advantageous, since it can then be pushed into a tubular refrigerant line.
  • the expansion unit is arranged in the interior of the refrigerant line and is preferably used to fix the filter drier. If the expansion unit is also designed to be inserted or installed inside the refrigerant line, this circumstance can be used to fix the filter drier in the refrigerant line. For example, if the filter drier strikes a stop on the refrigerant line (for example a collar of the refrigerant line that protrudes radially inwards), the filter drier can be fixed at the other end with the aid of the expansion unit. It is therefore possible that after the expansion unit has come into contact with the filter drier, attachment of the expansion unit to the refrigerant line also ensures that the filter drier is fixed.
  • the filter drier is introduced into the refrigerant line by a ball bed, with a fixing insert for fixing the ball bed being preferably provided in the refrigerant line on the side of the filter drier facing away from the expansion unit.
  • the fixing insert is fixed in the refrigerant line at least on one side, for example by an inwardly extending groove in the refrigerant line.
  • a pebble bed is a preferred form for implementing the filter drier, as this is particularly easy to produce and can be introduced into the refrigerant circuit in a simple manner.
  • a fixing insert for example in the form of a grid, whose grid spacing does not allow balls in the pebble bed to pass through, should be provided.
  • the fixing insert alone cannot ensure a fixed position of the bed of balls in the refrigerant line.
  • the expansion unit is used after introducing the pebble bed to the pebble bed between the fixing insert and the expansion unit.
  • the expansion unit is realized by a porous body
  • the porous body like the fixing insert at the other end of the bed, serves to hold the balls of the ball bed at a predetermined location along the refrigerant line. No soldering is required to create the filter drier, since after the insertion of the fixing insert, all that is necessary is to take the pebble bed into the refrigerant line and fix it by inserting the expansion unit into the interior of the refrigerant line. It can of course be provided that there is a further fastening step for fastening the expansion unit, although this is optional. It is also conceivable that the expansion unit, for example a porous body, is slightly oversized compared to the inside diameter of the refrigerant line, so that pressing in the porous body already ensures adequate attachment in the refrigerant line.
  • the expansion unit is arranged in the refrigerant line in such a way that a ball bed arranged between the fixing insert and the expansion unit is clamped in place in the refrigerant line.
  • the filter drier can therefore be prevented in a simple manner from slipping when the refrigerator and/or freezer is being transported.
  • the expansion unit is designed to perform a quasi-punctiform expansion of the refrigerant from high to low pressure over a length of less than 5 cm, preferably less than 3 cm and preferably less than 1 cm to perform, wherein the expansion unit is preferably an electronic expansion valve, a porous expansion element, which comprises or consists of a porous body, a thermostatic expansion valve or an orifice tube.
  • the expansion unit is or includes a porous body permeable to refrigerant, the porous body acting as an expansion unit preferably being arranged inside the refrigerant line.
  • the refrigerant circuit also includes an internal heat exchanger for heat exchange between a high-pressure side and a suction line of the refrigerant circuit.
  • the filter drier and the expansion unit are arranged downstream of the internal heat exchanger and upstream of the evaporator, preferably with the expansion unit being arranged in the inlet area of the evaporator, in particular directly at the inlet of the evaporator.
  • the arrangement position between the internal heat exchanger and the evaporator ensures a particularly low noise level when the refrigerant expands through the expansion unit.
  • the filter drier or the refrigerant line has a socket for evacuating the coolant circuit at the level of the filter drier.
  • the nozzle can be used to quickly evacuate the high-pressure side of the refrigerant circuit during the manufacturing process. This so-called “two-sided evacuation” can lead to speed advantages in the context of routine tests to be carried out in the course of production, since the evacuation takes place at two points.
  • the expansion unit is pressed into the refrigerant line, preferably a pipe, with the expansion unit designed as a porous body and the refrigerant line preferably having a cylindrical shape, the porous body having a cylindrical shape and the Refrigerant line has a conical shape or the porous body as well as the refrigerant line have a conical shape.
  • the porous body has a slight oversize.
  • the porous body has an insertion or centering bevel in order to simplify pressing the porous body into the refrigerant pipe.
  • the porous body can be rounded off at one of its ends or provided with a chamfer on the edge area.
  • the porous body has a cylindrical shape and the tube has a conical shape, the porous body centers itself due to the conical tube shape.
  • the above configurations of the porous body and the refrigerant tube occur, for example, in the connecting tube between the inner heat exchanger outlet and the evaporator inlet on, in which the connecting tube slowly expands its cross-section.
  • porous body has a conical shape just like the refrigerant tube, this has the advantage over the configurations discussed above that a more uniform surface pressure occurs on the radial lateral surface of the porous body.
  • the refrigerant line is pressed onto the expansion unit, with the expansion unit designed as a porous body and the refrigerant line, e.g. in the form of a tube, preferably having a cylindrical shape, the porous body in a support sleeve is arranged, the length of which exceeds that of the porous body and is pressed in the region of the excess length to a support sleeve enclosing wall of the pipe from the inside or the porous body has a thread on one of its outer peripheral surfaces, which with can be brought into connection with a corresponding mating thread arranged on the inner circumference of the coolant line.
  • the porous expansion unit can be inserted into the pipe with sufficient play so that the pipe touches the porous body from the outside is pressed and connected to it in a form-fitting manner.
  • the expansion unit designed as a porous body has an essentially cylindrical shape, has a thread on its outer peripheral surface and has a notch on one of its two end faces for screwing in the porous body.
  • the refrigerant circuit is designed in such a way that the refrigerant is compressed by a compressor, then flows through a condenser before it is passed through the expansion element and then, after flowing through the evaporator, back to the suction side of the compressor is guided.
  • a refrigerant line 2 connects a compressor 3, a condenser 4 and an evaporator 7.
  • the evaporator 7 then leads the refrigerant to the suction side of the compressor 3.
  • An expansion unit 6 (in the present case a capillary) is also provided between the condenser 4 and the evaporator 7.
  • a filter drier 8 is arranged between the condenser 4 and the capillary 6 , which is used to dehumidify the refrigerant and to filter out particles that could lead to a blockage of the subsequent capillary 6 .
  • the in 1 illustrated filter drier 8 to a component that must be soldered between two ends of the coolant line 2.
  • FIG. 2 shows a refrigerant circuit 1 according to the invention, in which a refrigerant line 2 connects a compressor 3, a condenser 4 and an evaporator 7.
  • the evaporator 7 then leads the refrigerant to the suction side of the compressor 3.
  • an internal heat exchanger 5 can be provided, in which a part of the refrigerant line 2 (i.e. the suction line) downstream from the evaporator 7 is in a heat-exchanging connection with the high-pressure side.
  • the arrangement of the expansion unit 6, which according to the invention can be formed by a porous body or an electronic expansion element, among other things, can advantageously be provided between the condenser 4 and the evaporator 7 downstream of the internal heat exchanger 5.
  • the arrangement position of the expansion element downstream of the internal heat exchanger results in a particularly low noise level when the refrigerant expands.
  • the filter drier 8 is arranged upstream of the expansion unit 6 and is located directly in front of the expansion unit 8 .
  • the arrangement of the filter dryer 8 directly upstream of the expansion unit 6 results in advantages with regard to the production of the coolant circuit 1.
  • FIG. 3 shows a first embodiment for the implementation of the filter drier 8, which is arranged immediately upstream of the expansion unit 6, viewed in the direction of flow of the refrigerant.
  • the illustration also shows that both the filter drier 8 and the expansion unit 6 are integrated into the interior of the refrigerant line 2 .
  • the refrigerant line 2 can have a tubular shape, so that an approximately cylindrical shape of the filter drier 8 as well as the expansion unit 6 is appropriate.
  • a solder joint can be saved compared to the system known from the prior art with a conventional filter dryer.
  • the process of arranging these two components can be carried out more quickly and without expensive equipment.
  • the filter drier 8 or the coolant line 2 may have a socket in the area where the filter drier 8 is accommodated, in order to enable two-sided evacuation of the coolant circuit 1 .
  • the area downstream of an internal heat exchanger 5 that can be provided as an option up to the inlet of the evaporator 7 has proven to be a particularly advantageous arrangement position in the refrigerant circuit 1 . Arranging the expansion unit 6 in this area results in a particularly low noise level when the refrigerant expands from high to low pressure
  • the filter drier 8 is realized by a bed of balls, which is held between a fixing insert 9 and the expansion unit 6 .
  • the fixing insert 9 can have a plate-like basic shape, which is embodied by several struts that are connected to one another.
  • the struts of the fixing insert 9 form openings through which a ball of the ball bed 8 cannot pass.
  • the fixing insert 9 blocks the ball bed 8 so that the bed 8 can be arranged at a defined location inside the refrigerant line 1 (for example a refrigerant line pipe).
  • the expansion unit 6 which can be embodied by a porous body, for example, is pushed into the interior of the refrigerant line 2 and locked with the refrigerant line 2 .
  • a bed of balls 8 can be clamped between these two components, so that the filter drier, which is in the form of a bed of balls, remains at the intended location in the coolant line 2 even when a refrigerator and/or freezer according to the invention is being transported.
  • the porous body itself can assume the filter function, so that the filter drier 8 then only has to assume the task of drying the refrigerant. If, on the other hand, an electronic expansion valve is used as the expansion unit 6, the filter dryer 8 must also take over the filter function, so that a corresponding granularity should be selected for the pebble bed or an additional filter should be provided.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
EP22191838.6A 2021-08-26 2022-08-24 Appareil de refroidissement et/ou de congélation Pending EP4141355A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021122061 2021-08-26
DE102021128680.8A DE102021128680A1 (de) 2021-08-26 2021-11-04 Kühl- und/oder Gefriergerät

Publications (1)

Publication Number Publication Date
EP4141355A1 true EP4141355A1 (fr) 2023-03-01

Family

ID=83059203

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22191838.6A Pending EP4141355A1 (fr) 2021-08-26 2022-08-24 Appareil de refroidissement et/ou de congélation

Country Status (1)

Country Link
EP (1) EP4141355A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69316149T2 (de) * 1992-10-23 1998-04-16 Matsushita Refrigeration Kältemittelkompressor und Kältesystem mit diesem Kompressor
US5987914A (en) * 1997-08-19 1999-11-23 Mitsubishi Denki Kabushiki Kaisha Refrigerating/air-conditioning apparatus
KR20070039843A (ko) * 2005-10-10 2007-04-13 삼성전자주식회사 냉장고
US7320229B2 (en) * 2005-08-02 2008-01-22 Denso Corporation Ejector refrigeration cycle
DE102011078317A1 (de) * 2011-06-29 2013-01-03 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät mit einem Verdampfer
US20130283841A1 (en) * 2012-02-23 2013-10-31 Ford Global Technologies, Llc Heat Exchanger for an Air Conditioning System
DE102012112708A1 (de) * 2012-12-20 2014-06-26 Denso Automotive Deutschland Gmbh Kältemittelkreislauf, insbesondere in einem Fahrzeug
DE102015219171A1 (de) * 2015-10-05 2017-04-06 BSH Hausgeräte GmbH Kältemaschine für ein Haushaltskältegerät

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69316149T2 (de) * 1992-10-23 1998-04-16 Matsushita Refrigeration Kältemittelkompressor und Kältesystem mit diesem Kompressor
US5987914A (en) * 1997-08-19 1999-11-23 Mitsubishi Denki Kabushiki Kaisha Refrigerating/air-conditioning apparatus
US7320229B2 (en) * 2005-08-02 2008-01-22 Denso Corporation Ejector refrigeration cycle
KR20070039843A (ko) * 2005-10-10 2007-04-13 삼성전자주식회사 냉장고
DE102011078317A1 (de) * 2011-06-29 2013-01-03 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät mit einem Verdampfer
US20130283841A1 (en) * 2012-02-23 2013-10-31 Ford Global Technologies, Llc Heat Exchanger for an Air Conditioning System
DE102012112708A1 (de) * 2012-12-20 2014-06-26 Denso Automotive Deutschland Gmbh Kältemittelkreislauf, insbesondere in einem Fahrzeug
DE102015219171A1 (de) * 2015-10-05 2017-04-06 BSH Hausgeräte GmbH Kältemaschine für ein Haushaltskältegerät

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