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EP0167978A2 - Suction tube heat exchanger and method of manufacture - Google Patents

Suction tube heat exchanger and method of manufacture Download PDF

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Publication number
EP0167978A2
EP0167978A2 EP85108234A EP85108234A EP0167978A2 EP 0167978 A2 EP0167978 A2 EP 0167978A2 EP 85108234 A EP85108234 A EP 85108234A EP 85108234 A EP85108234 A EP 85108234A EP 0167978 A2 EP0167978 A2 EP 0167978A2
Authority
EP
European Patent Office
Prior art keywords
tube
suction
heat exchanger
suction tube
capillary tube
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Withdrawn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
EP85108234A
Other languages
German (de)
French (fr)
Other versions
EP0167978A3 (en
Inventor
Edvin List Clausen
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.)
Norsk Hydro ASA
Original Assignee
Norsk Hydro ASA
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 Norsk Hydro ASA filed Critical Norsk Hydro ASA
Publication of EP0167978A2 publication Critical patent/EP0167978A2/en
Publication of EP0167978A3 publication Critical patent/EP0167978A3/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • 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
    • F25B41/37—Capillary tubes
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/05—Compression system with heat exchange between particular parts of the system
    • F25B2400/052—Compression system with heat exchange between particular parts of the system between the capillary tube and another part of the refrigeration cycle
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/05—Compression system with heat exchange between particular parts of the system
    • F25B2400/054—Compression system with heat exchange between particular parts of the system between the suction tube of the compressor and another part of the cycle
    • 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
    • F25B40/00—Subcoolers, desuperheaters or superheaters

Definitions

  • the present ivention concerns a heat exchanger of the so-called suction tube type for locating in the cooling circuit of a refrigerator/freezer in the compressor's suction line, and furthermore a method for manufacturing such heat exchangers.
  • Heat exchangers of this type incorporated into cooling systems in conjunction with a compressor, comprise a capillary tube connected to the system's suction line.
  • the purpose of this arrangement is that heat from the condensing fluid in the capillary tube is transferred to vapor drawn into the compressor through the suction tube. In this way, the efficiency of the cooling system is increased while simultaneously preventing the intake of unevaporated fluid into the compressor.
  • the object of the present invention is therefore to provide a heat exchanger that is cheaper to manufacture, yet qualitatively on a par with the heat exchangers of this type hitherto known and used.
  • Another object of the present invention is to provide a method for the fabrication of heat exchangers which provides a simple, effective, and mechanically/thermally reliable joint between the tubes in the heat exchanger. This is achieved by the heat exchanger and the fabrication method as stated in the characterizing parts of the patent claims 1 and 4 of the present application.
  • the suction line is given an oval cross-section, which is transformed to an essentially circular cross-section in the joining process of plastic deformation.
  • a heat exchanger (8) is shown in more details, comprising a suction line (1) and a capillary tube (2) inserted and fastened in the groove (3) in the suction tube.
  • Two standard tube fittings (9) connect the ends of the suction tube to the cooling circuit. (Only one of the fittings is shown in the figure.)
  • Fig, 3 which shows a vertical cross-section of the heat exchanger at line A-A on Fig. 2, illustrates the superior joint between the suction tube (1) and the capillary tube (2), where up to 80% of the surface of the capillary tube is engaged, and thereby in heat-transferring contact with the walls of the suction line through the inwardly protruding groove (3).
  • Fig. 4 shows both tubes in a vertical cross-section prior to the joining operation.
  • the suction line (1) is illustrated in the preferred embodiment with an oval (elliptical) cross-section and an inwardly projecting groove (3) forming a recess in the tube's circumference.
  • the cross-section of the groove and the diameter of the capillary tube are dimensioned to facilitate insertion of the tube into the groove.
  • the subsequent plastic deformation of the suction line which is transformed to an essentially circular cross-section, results in the walls (32) of the groove being elongated around the perimeter of the tube, partly enclosing the capillary tube.
  • FIG. 5 Another advantageous heat exchanger embodiment (8) according to the present invention is shown in Fig. 5.
  • the integrated groove (3) in the suction line (1) is formed as a projection protruding out from the surface of the tube.
  • the suction tube has an essentially circular cross-section.
  • the plastic deformation occuring in the process of joining the tubes is limited in this case to the deformation of the walls of the groove (32), which encompass the capillary tube after joining, resulting in a solid, reliable mechanical and heat exchanging contact between the tubes.
  • Fig. 7 shows still another embodiment of the suction tube ( 1 ) having an essentially circular cross-section with an inwardly protruding groove (3). Free surface of the capillary tube inserted and fastened in such a groove will achieve a direct contact with the circulating fluidum in the suction tube and result in further improvement of the heat transfer characteristic.
  • the heat exchanger according to the invention is not limited to the preferred embodiments discussed above and illustrated in the figures. Different requirements as to heat exchanging capacity, compact design of the cooling system, etc., may call for the incorporation of more than one capillary tube per suction line, for instance without excluding this variant from the scope of the present invention.
  • both the suction line and the capillary tube may be fabricated of aluminium, since neither the design nor the fabrication of heat exchangers according to the invention raise any limits on the choice of materials.
  • aluminium applied as construction material provides obvious advantages in the form of weight reduction and less problems associated with connections and corrosion in the cooling circuit.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Seasonings (AREA)
  • Saccharide Compounds (AREA)

Abstract

The invention concerns a suction type heat exchanger for locating in cooling circuits, comprising a suction tube (1) and a capillary tube (2). The suction tube is provided with one or more integrated grooves (3) shaped complementary to and dimensioned for insertion of the capillary tube. The method for manufacturing the suction heat exchangers is based on exposure to the plastic deformation of both tubes after insertion of the capillary tube (2) into the groove (3) in the suction tube.

Description

  • The present ivention concerns a heat exchanger of the so-called suction tube type for locating in the cooling circuit of a refrigerator/freezer in the compressor's suction line, and furthermore a method for manufacturing such heat exchangers.
  • Heat exchangers of this type, incorporated into cooling systems in conjunction with a compressor, comprise a capillary tube connected to the system's suction line. The purpose of this arrangement is that heat from the condensing fluid in the capillary tube is transferred to vapor drawn into the compressor through the suction tube. In this way, the efficiency of the cooling system is increased while simultaneously preventing the intake of unevaporated fluid into the compressor.
  • Various types of heat exchangers fabricated of copper or stainless steel are presently used in refrigerators/freezers. The classical heat exchanger design is based on the insertion of the capillary tube into the suction line, providing direct contact between the medium flowing in the suction line and the surface of the capillary tube. This design is characterized by two principal disadvantages. For one, a soldering operation is required in connection with the insertion of the capillary tube through the wall of the suction tube. This increases the cost of the assembly work and imposes a limitation on the choice of materials. In practice, copper tubing is primarily used.
  • For the other, problems occur with the freezing of the capillary tube, forcing one to overdimension, i.e. by increasing the length of both tubes in order to achieve a satisfactory heat exchange.
  • Furthermore, it is known to apply heat exchangers where the capillary tube is either wound around the suction line externally or soldered along the outside of the suction tube. A relatively poor heat transfer through a purely mechanical contact in the case of wound capillary tubing, and problems as to the limited choice of materials and high costs, when the tubes are soldered as described above, are the disadvantages of this design. Even with soldered capillary tubing made of copper, the heat exchange is not optimal due to the contact surface between the tubes being limited to 30-35% at most of the capillary tube's surface.
  • The object of the present invention is therefore to provide a heat exchanger that is cheaper to manufacture, yet qualitatively on a par with the heat exchangers of this type hitherto known and used.
  • Another object of the present invention is to provide a method for the fabrication of heat exchangers which provides a simple, effective, and mechanically/thermally reliable joint between the tubes in the heat exchanger. This is achieved by the heat exchanger and the fabrication method as stated in the characterizing parts of the patent claims 1 and 4 of the present application.
  • In conformity with an advantageous design of the heat exchanger according to the invention, the suction line is given an oval cross-section, which is transformed to an essentially circular cross-section in the joining process of plastic deformation.
  • The invention will be described more explicitly here with references to the enclosed drawings, Figs. 1-7, where:
    • Fig. 1 shows a schematic outline of a compressor cooling system for a refrigerator/freezer.
    • Fig. 2 shows the heat exchanger according to the invention.
    • Fig. 3 shows the heat exchanger in vertical cross-section along the line A-A in Fig. 2.
    • Fig. 4 shows the suction line and capillary tube as individual components in vertical cross-section prior to the joining operation.
    • Fig. 5 shows another design of the heat exchanger according to the invention, and
    • Figs. 6 and 7 show in vertical cross-section two alternative designs of the suction tubing.
    • Fig. 1 shows a schematic outline of a compressor cooling system comprising a condensor (10), an evaporator (15) and a compressor (5) with a capillary tube (2) connecting the condensor with the evaporator. A suction accumulator (4) is also displayed in the figure, with the suction line (1) incorporated in the heat exchanger (8) in front of the compressor connection.
  • In Fig. 2, a heat exchanger (8) is shown in more details, comprising a suction line (1) and a capillary tube (2) inserted and fastened in the groove (3) in the suction tube. Two standard tube fittings (9) connect the ends of the suction tube to the cooling circuit. (Only one of the fittings is shown in the figure.)
  • Fig, 3, which shows a vertical cross-section of the heat exchanger at line A-A on Fig. 2, illustrates the superior joint between the suction tube (1) and the capillary tube (2), where up to 80% of the surface of the capillary tube is engaged, and thereby in heat-transferring contact with the walls of the suction line through the inwardly protruding groove (3).
  • The process for joining the tubing/fabricating the heat exchanger itself is best illustrated in Fig. 4, which shows both tubes in a vertical cross-section prior to the joining operation.
  • The suction line (1) is illustrated in the preferred embodiment with an oval (elliptical) cross-section and an inwardly projecting groove (3) forming a recess in the tube's circumference. The cross-section of the groove and the diameter of the capillary tube are dimensioned to facilitate insertion of the tube into the groove. The subsequent plastic deformation of the suction line, which is transformed to an essentially circular cross-section, results in the walls (32) of the groove being elongated around the perimeter of the tube, partly enclosing the capillary tube. Thus, a simple mechanical joining method ensures that intimate contact is established and maintained between the tubes, providing superior heat transfer between the two mediums - warm fluid in the capillary tube and coolant in the suction line.
  • Another advantageous heat exchanger embodiment (8) according to the present invention is shown in Fig. 5. The integrated groove (3) in the suction line (1) is formed as a projection protruding out from the surface of the tube.
  • As evidenced.by Fig. b, showing a vertical cross-section of the suction tube (1) and the capillary tube (2) prior to joining, the suction tube has an essentially circular cross-section. The plastic deformation occuring in the process of joining the tubes is limited in this case to the deformation of the walls of the groove (32), which encompass the capillary tube after joining, resulting in a solid, reliable mechanical and heat exchanging contact between the tubes.
  • Fig. 7 shows still another embodiment of the suction tube (1) having an essentially circular cross-section with an inwardly protruding groove (3). Free surface of the capillary tube inserted and fastened in such a groove will achieve a direct contact with the circulating fluidum in the suction tube and result in further improvement of the heat transfer characteristic.
  • The above described joining operation (not shown in the figures) may be performed employing all familiar, relevant methods, such as pressing, rolling or drawing of the tubing while simultaneously calibrating the tubes.
  • The heat exchanger according to the invention is not limited to the preferred embodiments discussed above and illustrated in the figures. Different requirements as to heat exchanging capacity, compact design of the cooling system, etc., may call for the incorporation of more than one capillary tube per suction line, for instance without excluding this variant from the scope of the present invention.
  • Furthermore, both the suction line and the capillary tube may be fabricated of aluminium, since neither the design nor the fabrication of heat exchangers according to the invention raise any limits on the choice of materials. As known, aluminium applied as construction material provides obvious advantages in the form of weight reduction and less problems associated with connections and corrosion in the cooling circuit.

Claims (9)

1. Suction line heat exchanger for locating in cooling circuits, comprising a suction tube (1) and a capillary tube (2),
characterized in that
the suction tube (1) is formed as a metal tube provided with one or more integrated, half-closed grooves (3) running longitudinally, providing fastening means for the capillary tube (2), and where the cavity of the grooves is formed complementary to and dimensioned for the insertion of the capillary tube (2).
2. Suction line heat exchanger according to claim 1,
characterized in that
the suction tube (1) is formed with an oval cross-section and where the integrated longitudinally running groove (3) is projecting inwards into the suction tube as a recess in the tube's circumference.
3. Suction line heat exchanger according to claim 1,
characterized in that
the suction tube (1) is formed with an essentially circular cross-section, and where the integrated groove (3) is projecting outwards from the circumference of the tube.
4. Suction line heat exchanger according to claim 1,
characterized in that
the suction tube (1) is formed with an essentially circular cross-section, and where the integrated groove (3) is projecting inwards from the tube wall.
5. Suction line heat exchanger according to one or more of the preceding claims,
characterized in that
the suction tube (1) and the capillary tube (2) are extruded aluminium tubing.
6. Method for fabrication of the suction tube heat exchanger according to one or more of the preceding claims, where the capillary tube (2) is inserted into the complementarily formed grooves (3) in the suction tube (1), and the assembled tubing (1,2) is subsequently subjected to plastic deformation,
characterized in that
the walls (32) of the groove (3) are uniformly deformed into an intimate contact with the capillary tube along the entire length of the joining area between the capillary tube (2) and the suction tube (1).
7. Method according to claim 6,
characterized in that
the oval cross-section of the suction tube (1) is also acquiring an essentially circular cross-section along the joining area between the tubes (1,2) during the plastic deformation process.
8. Method according to claim 6,
characterized in that
the plastic deformation is limited to the walls of the groove (32).
9. Method according to claim 6, 7 or 8,
characterized in that
the plastic deformation joining is accomplished by employing a press operation, a drawing operation or a rolling operation.
EP85108234A 1984-07-06 1985-07-03 Suction tube heat exchanger and method of manufacture Withdrawn EP0167978A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO842755 1984-07-06
NO842755A NO155067C (en) 1984-07-06 1984-07-06 SUGAR HEAT EXCHANGES AND PROCEDURES FOR PRODUCING THE SAME.

Publications (2)

Publication Number Publication Date
EP0167978A2 true EP0167978A2 (en) 1986-01-15
EP0167978A3 EP0167978A3 (en) 1986-06-11

Family

ID=19887755

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85108234A Withdrawn EP0167978A3 (en) 1984-07-06 1985-07-03 Suction tube heat exchanger and method of manufacture

Country Status (3)

Country Link
EP (1) EP0167978A3 (en)
DK (1) DK308485A (en)
NO (1) NO155067C (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0258040A1 (en) * 1986-08-28 1988-03-02 Sumitomo Chemical Company, Limited Thermoplastic resin composition comprising a polyamide
EP0749892A1 (en) * 1995-05-26 1996-12-27 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Beam for a vehicle frame and its method of manufacturing
US7243499B2 (en) * 2004-08-16 2007-07-17 Parker Hannifin Corporation Refrigeration capillary tube inside suction line assembly
CN102313403A (en) * 2011-09-13 2012-01-11 海尔集团公司 Evaporator assembly, refrigerating loop system and refrigerating equipment
CN103673422A (en) * 2013-12-14 2014-03-26 广东奥马电器股份有限公司 Energy-saving air return pipe assembly, machining method and mold
CN107178935A (en) * 2016-03-11 2017-09-19 福特全球技术公司 Nested type HVAC pipeline
US9821420B2 (en) 2014-01-16 2017-11-21 Whirlpool Corporation Method of forming a refrigeration heat exchanger
CN107806726A (en) * 2017-10-19 2018-03-16 合肥华凌股份有限公司 Device for drying and filtering, air-returning pipe component and refrigeration plant
DE102017110706A1 (en) * 2017-05-17 2018-11-22 Miele & Cie. Kg Throttle device for a heat pump and heat pump with a throttle device
JP2020186887A (en) * 2019-05-17 2020-11-19 アクア株式会社 refrigerator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112696857A (en) * 2020-12-28 2021-04-23 南京祥斯知商贸有限公司 Energy-saving refrigerator

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415243A (en) * 1943-10-20 1947-02-04 Bohn Aluminium & Brass Corp Refrigeration apparatus and method of making same
US2687626A (en) * 1952-02-16 1954-08-31 Bohn Aluminium & Brass Corp Heat exchanger having open-sided bore superimposed on closed bore
US3448798A (en) * 1967-01-26 1969-06-10 Wakefield Eng Inc Heat transfer apparatus
CA1106628A (en) * 1976-10-27 1981-08-11 Robert B. Gelbard High efficiency heat exchanger for refrigeration suction line/capillary tube assembly
IT8253373V0 (en) * 1982-06-02 1982-06-02 Indesit REFRIGERATOR CIRCUIT OF THE TYPE WITH EXPANSION CAPILLARY AND HEAT RECOVERY CYCLE

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0258040A1 (en) * 1986-08-28 1988-03-02 Sumitomo Chemical Company, Limited Thermoplastic resin composition comprising a polyamide
EP0749892A1 (en) * 1995-05-26 1996-12-27 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Beam for a vehicle frame and its method of manufacturing
US5839777A (en) * 1995-05-26 1998-11-24 Dr. Ing. H.C.F. Porsche Ag Support of a body structure of a vehicle and process for manufacturing same
US7243499B2 (en) * 2004-08-16 2007-07-17 Parker Hannifin Corporation Refrigeration capillary tube inside suction line assembly
CN102313403A (en) * 2011-09-13 2012-01-11 海尔集团公司 Evaporator assembly, refrigerating loop system and refrigerating equipment
CN103673422A (en) * 2013-12-14 2014-03-26 广东奥马电器股份有限公司 Energy-saving air return pipe assembly, machining method and mold
US9821420B2 (en) 2014-01-16 2017-11-21 Whirlpool Corporation Method of forming a refrigeration heat exchanger
CN107178935A (en) * 2016-03-11 2017-09-19 福特全球技术公司 Nested type HVAC pipeline
DE102017110706A1 (en) * 2017-05-17 2018-11-22 Miele & Cie. Kg Throttle device for a heat pump and heat pump with a throttle device
CN107806726A (en) * 2017-10-19 2018-03-16 合肥华凌股份有限公司 Device for drying and filtering, air-returning pipe component and refrigeration plant
JP2020186887A (en) * 2019-05-17 2020-11-19 アクア株式会社 refrigerator

Also Published As

Publication number Publication date
NO842755L (en) 1986-01-07
DK308485A (en) 1986-01-07
EP0167978A3 (en) 1986-06-11
DK308485D0 (en) 1985-07-05
NO155067C (en) 1987-02-04
NO155067B (en) 1986-10-27

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