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WO1989001110A1 - A heat transfer device - Google Patents

A heat transfer device Download PDF

Info

Publication number
WO1989001110A1
WO1989001110A1 PCT/FI1988/000094 FI8800094W WO8901110A1 WO 1989001110 A1 WO1989001110 A1 WO 1989001110A1 FI 8800094 W FI8800094 W FI 8800094W WO 8901110 A1 WO8901110 A1 WO 8901110A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
refrigerant
groove
heat transfer
jacket
Prior art date
Application number
PCT/FI1988/000094
Other languages
French (fr)
Inventor
Kauno Touko Ensio Laiho
Original Assignee
Pakkastappi Oy
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 FI873322A external-priority patent/FI76415C/en
Application filed by Pakkastappi Oy filed Critical Pakkastappi Oy
Publication of WO1989001110A1 publication Critical patent/WO1989001110A1/en

Links

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
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/10—Means for stopping flow in pipes or hoses
    • F16L55/103—Means for stopping flow in pipes or hoses by temporarily freezing liquid sections in the pipe
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D15/00—Devices not covered by group F25D11/00 or F25D13/00, e.g. non-self-contained movable devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/0008—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one medium being in heat conductive contact with the conduits for the other medium

Definitions

  • the invention relates to a heat transfer device to be used in the repair of water pipes and intended for preventing the flow of liquid through a pipe and forming a part of a closed refrigeration system, the device forming an evaporator for a refrigerant.
  • the object of the present invention is to pro ⁇ vide a device which avoids the above-mentioned draw ⁇ backs.
  • a further object is to provide a device which , can be adapted to pipes of different sizes and which is easy to arrange into working spots difficult to reach. This is achieved by means of a device according to the invention, which is characterized in that the device is provided with a groove adapted for at least one pipe size and shape.
  • the invention is based on the idea that there is provided around the pipe section to be refrigerated a closed refrigerant circuit, which is easy to fit tightly around the pipe section or a refrigerating me- dium circuit which is connected to a separate cooling medium circuit.
  • a closed refrigerant circuit which is easy to fit tightly around the pipe section or a refrigerating me- dium circuit which is connected to a separate cooling medium circuit.
  • the repair can be carried ' out more rapidly, and adverse environmental effects are avoided; on the other hand, the device can be used in any environment.
  • the device and its connec- tions are easy to construct using existing convention ⁇ al refrigerating units.
  • Figure 1 shows a heat transfer device com ⁇ prising preformed grooves for different pipes sizes and shapes
  • Figure 2 shows a heat transfer device com ⁇ prising two parts movable in parallel with respect to each other on a slide;
  • Figure 3 shows a heat transfer device provided with a straining strap
  • Figure 4 shows a heat transfer device com ⁇ prising two jacket portions hinged on to each other
  • Figure 5 shows a heat transfer device com ⁇ prising a flexible jacket connected to a separate cooling circuit.
  • the heat transfer device of Figure 1 comprises two evaporation chambers 1 and 2 which are hinged on to each other by a flexible tube 4.
  • the tube, and the refrigerant flowing therethrough, is arranged to first go into one chamber 1 and out of it through the end * facing the pipe; then it returns to the other end of
  • the tube ends are connected to a supply and return tube 5 and 6, respectively, of a refrigerating unit 7.
  • the chambers are provided with grooves 8 for pipes of different sizes and shapes.
  • the grooves can f rther be provided with thermally conductive fitting parts 9. 15
  • the chambers can be tightened with respect to each • other by means of screws 3.
  • the heat transfer device of Figure 2 comprises two evaporation chambers 11 and 12 movable with re ⁇ spect to each other on a slide (not shown) .
  • Refriger- 20 ant tubes 4a, 4b are connected to the refrigerant cir ⁇ cuit as described above.
  • the flow of the refrigerant is arranged to take place either through both chambers (A) or through one chamber only (B) .
  • a groove 18 pro ⁇ vided in the chambers 11 and 12 for the pipe to be re- 25 frigerated may also comprise thermally conductive fitting parts for different pipe sizes and shapes.
  • the embodiment of Figure 3 comprises a single • evaporation chamber 21 through which the refrigerant flow is arranged to take place.
  • the tubes 4auß, 4b are s 30 connected to the refrigerant circuit as described above.
  • the device is intended to be fitted around the > pip® "to be refrigerated by means of a thermally con ⁇ ductive straining strap 22.
  • the strap is strained by means of latch means 23.
  • Various thermally conductive 35 fitting parts 29 can be used between the chamber 21 and the pipe.
  • the end face of the chamber can also be formed according to a pipe.
  • the heat transfer device of Figure 4 is formed by two jacket portions 31 and 32 hinged on to each other and acting as an evaporator.
  • the jacket portions correspond to the pipe to be refrigerated in shape so that they together enclose the pipe.
  • the flow of the refrigerant is arranged through the tube 4a into the first jacket portion 31, where it is passed on by guide ribs 34, and further through a connecting tube 33 into the second jacket portion 32, wherefrom it is discharged through the tube 4b.
  • the jacket portions can be provided with evacuating means.
  • the above-men ⁇ tioned refrigerant circuit is connected to the tubes 4a and 4b. Such a structure is intended primarily for large pipes.
  • the heat transfer device of Figure 5 is formed by a jacket 41 made of a flexible material such as plastic. Liquid guide ribs 44 are provided within said jacket.
  • the jacket can be fitted tightly around the pipe to be refrigerated and fixed by a sticker or a fixing spring, for instance.
  • the ' jacket 41 forms part of a separate closed ⁇ heat • transfer circuit A which is connected via a heat exchanger (evaporator) B to a separate closed cooling medium circuit (freon) C known per se.
  • the heat transfer liquid may be glycol or a mixture of water and alcohol which do not freeze at temperatures oc ⁇ curring during the repair.
  • the circulation of the li- quid can be effected by a pump P, such as a piston pump or a gear-type pump.
  • a double hose connected at the bending point thereof by a U-shaped part.
  • the hose can be corre- spondingly fitted around the pipe to be refrigerated and fixed e.g. with a sticker or a tension spring.
  • Both the jacket and the hose can be coated with a material having poor adhesive properties for improv ⁇ ing adherence and adaptability (heat transfer) . Corre- spondingly, they can be insulated for improving effi ⁇ ciency.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)

Abstract

The invention relates to a heat transfer device, particularly clamp-like, intended for preventing the flow of liquid through a pipe and forming part of a closed refrigeration system, the device forming an evaporator for a refrigerant. The device mainly comprises a chamber structure (1, 2) in which the refrigerant is expanded, and it is provided with a groove (8) suited for at least one pipe size and shape. The groove can also be provided with fitting parts (9). So a pipe refrigerator suited for various uses is obtained which does not affect adversely the environment and which is not hazardous to users.

Description

A heat transfer device
The invention relates to a heat transfer device to be used in the repair of water pipes and intended for preventing the flow of liquid through a pipe and forming a part of a closed refrigeration system, the device forming an evaporator for a refrigerant.
It is previously known to block the passage of liquid (water) through the pipe by forming therein a temporary ice plug. The freezing has been effected by spraying a refrigerant, such as liquid freon, on the pipe. Amongst the drawbacks of this kind of solution is the high consumption of refrigerant as it has to be sprayed on the pipe continuously during the repair. Furthermore, the refrigerant may be conveyed into the environment thus damaging it, risking safety at work, and causing health hazards.
Attempts have been made to reduce such draw¬ backs using a device in which the refrigerant circu- lates in a space between the pipe to be refrigerated and the refrigeration means. One drawbac 'is that the refrigerant is in direct contact with the pipe; on the other hand, rather complicated and, as a consequence, expensive solutions are required for ensuring the necessary sealing effect and reliable operation.
Moreover, devices have been developed in which the refrigerant is arranged to circulate partially or entirely around the pipe section to be refrigerated. These devices, however, are massive and complicated in structure as well as cumbersome and difficult to ar¬ range into working spots.
The object of the present invention is to pro¬ vide a device which avoids the above-mentioned draw¬ backs. A further object is to provide a device which , can be adapted to pipes of different sizes and which is easy to arrange into working spots difficult to reach. This is achieved by means of a device according to the invention, which is characterized in that the device is provided with a groove adapted for at least one pipe size and shape.
The invention is based on the idea that there is provided around the pipe section to be refrigerated a closed refrigerant circuit, which is easy to fit tightly around the pipe section or a refrigerating me- dium circuit which is connected to a separate cooling medium circuit. As a consequence, the repair can be carried 'out more rapidly, and adverse environmental effects are avoided; on the other hand, the device can be used in any environment. The device and its connec- tions are easy to construct using existing convention¬ al refrigerating units.
In the following the invention will be de¬ scribed by way of example and in more detail with re¬ ference to the attached drawings, wherein Figure 1 shows a heat transfer device com¬ prising preformed grooves for different pipes sizes and shapes;
Figure 2 shows a heat transfer device com¬ prising two parts movable in parallel with respect to each other on a slide;
Figure 3 shows a heat transfer device provided with a straining strap;
Figure 4 shows a heat transfer device com¬ prising two jacket portions hinged on to each other; and
Figure 5 shows a heat transfer device com¬ prising a flexible jacket connected to a separate cooling circuit.
The heat transfer device of Figure 1 comprises two evaporation chambers 1 and 2 which are hinged on to each other by a flexible tube 4. The tube, and the refrigerant flowing therethrough, is arranged to first go into one chamber 1 and out of it through the end * facing the pipe; then it returns to the other end of
5 the same chamber along the outer surface thereof. In this end the tube forms a spiral providing a hinge ef¬ fect. The tube goes further along the outer surface of the other chamber 2 and into said chamber through one end thereof and further out of it from the other end. 10 The tube ends are connected to a supply and return tube 5 and 6, respectively, of a refrigerating unit 7. The chambers are provided with grooves 8 for pipes of different sizes and shapes. The grooves can f rther be provided with thermally conductive fitting parts 9. 15 The chambers can be tightened with respect to each • other by means of screws 3.
The heat transfer device of Figure 2 comprises two evaporation chambers 11 and 12 movable with re¬ spect to each other on a slide (not shown) . Refriger- 20 ant tubes 4a, 4b are connected to the refrigerant cir¬ cuit as described above. The flow of the refrigerant is arranged to take place either through both chambers (A) or through one chamber only (B) . A groove 18 pro¬ vided in the chambers 11 and 12 for the pipe to be re- 25 frigerated may also comprise thermally conductive fitting parts for different pipe sizes and shapes.
The embodiment of Figure 3 comprises a single •evaporation chamber 21 through which the refrigerant flow is arranged to take place. The tubes 4a„, 4b are s 30 connected to the refrigerant circuit as described above. The device is intended to be fitted around the > pip® "to be refrigerated by means of a thermally con¬ ductive straining strap 22. The strap is strained by means of latch means 23. Various thermally conductive 35 fitting parts 29 can be used between the chamber 21 and the pipe. Naturally, the end face of the chamber can also be formed according to a pipe.
The heat transfer device of Figure 4 is formed by two jacket portions 31 and 32 hinged on to each other and acting as an evaporator. The jacket portions correspond to the pipe to be refrigerated in shape so that they together enclose the pipe. The flow of the refrigerant is arranged through the tube 4a into the first jacket portion 31, where it is passed on by guide ribs 34, and further through a connecting tube 33 into the second jacket portion 32, wherefrom it is discharged through the tube 4b. The jacket portions can be provided with evacuating means. The above-men¬ tioned refrigerant circuit is connected to the tubes 4a and 4b. Such a structure is intended primarily for large pipes.
The heat transfer device of Figure 5 is formed by a jacket 41 made of a flexible material such as plastic. Liquid guide ribs 44 are provided within said jacket. The jacket can be fitted tightly around the pipe to be refrigerated and fixed by a sticker or a fixing spring, for instance.- The ' jacket 41 forms part of a separate closed■ heat •transfer circuit A which is connected via a heat exchanger (evaporator) B to a separate closed cooling medium circuit (freon) C known per se. In the heat transfer circuit the heat transfer liquid may be glycol or a mixture of water and alcohol which do not freeze at temperatures oc¬ curring during the repair. The circulation of the li- quid can be effected by a pump P, such as a piston pump or a gear-type pump.
In place of a jacket it is likewise possible to use a double hose connected at the bending point thereof by a U-shaped part. The hose can be corre- spondingly fitted around the pipe to be refrigerated and fixed e.g. with a sticker or a tension spring.
Both the jacket and the hose can be coated with a material having poor adhesive properties for improv¬ ing adherence and adaptability (heat transfer) . Corre- spondingly, they can be insulated for improving effi¬ ciency.
It is obvious that the separate cooling medium circuit and heat transfer circuit described in connec¬ tion with Figure 5 can be applied also in connection with the other embodiments. It is likewise possible in connection with the different embodiments to use in¬ sulation and an agent, such as grease or the like, promoting heat transfer between the pipe'to be refri¬ gerated and the heat transfer device. The heat trans- fer device can also be applied elsewhere than on pipes.
The drawings and the description related there¬ to are only intended to illustrate the idea of the in¬ vention. In its details, the device according to the invention may vary within the scope of the attached claims.

Claims

Claims :
1. A heat transfer device, particularly clamp¬ like, intended for preventing the flow of liquid through a pipe and forming part of a closed refrigera¬ tion system, said device further forming an evaporator for a refrigerant, c h a r a c t e r i z e d in that the device is provided with a groove (8) corresponding to at least one pipe size and shape.
2. A device according to claim 1, c h a r a c¬ t e r i z e d - in that a groove (18) is formed be¬ tween two counter parts (11, 12) displaceable with re¬ spect to each other.
3. A device according to claim 1, c h a r a c- t e r i z e d in that the groove is formed between a part (21) acting as an evaporator and a flexible fas¬ tening means (22) to be tightened with respect to said part.
4. A device according to claims 1, 2 or 3, c h a r a c t e r i z e d in that the groove (8; 18;
28) is provided with fitting parts (9; 19; 29) suited for different pipe sizes and shapes.
5. A device according to claim 1, c h a r c¬ t e r i z e d in that device comprises at least two separate jackets (31, 32) which follow the shape of the pipe and act as an evaporator, said jackets being interconnected by a connection part (33) and provided with evacuating means.
6. A device according to claim 1, c h a r a c- t e r i z e d in that the device comprises a single jacket (41) of a flexible material, said jacket being fitted tightly around the pipe.
7. A device according to claim 5 or 6, c h a r a c t e r i z e d in that the jacket/s (31, 32; 41) is/are provided with ribs (34; 44) guiding the flow of the refrigerant.
8. A device according to claim 1, c h a r a c¬ t e r i z e d in that a liquid cooled by a separate cooling medium circuit (C) is circulated by a heat ex¬ changer (B) in the device forming part of the closed refrigeration system (A) .
PCT/FI1988/000094 1987-07-30 1988-06-10 A heat transfer device WO1989001110A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI873322A FI76415C (en) 1986-11-17 1987-07-30 The heat transfer device
FI873322 1987-07-30

Publications (1)

Publication Number Publication Date
WO1989001110A1 true WO1989001110A1 (en) 1989-02-09

Family

ID=8524846

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1988/000094 WO1989001110A1 (en) 1987-07-30 1988-06-10 A heat transfer device

Country Status (1)

Country Link
WO (1) WO1989001110A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0559078A1 (en) * 1992-03-03 1993-09-08 Rothenberger Werkzeuge-Maschinen Gmbh Cooling clamp for freezing pipes
WO1994021955A1 (en) * 1993-03-18 1994-09-29 Lothar Beise Method and device for forming a plug in a conduit
EP0736721A1 (en) * 1995-04-08 1996-10-09 Winkler, Konrad, Dr.-Ing. habil. Device for stopping a leak in a reservoir
DE19617619A1 (en) * 1995-05-31 1996-12-12 Spectronics Corp Device or evaporator for freezing a pipe section
WO2000068624A1 (en) 1999-05-06 2000-11-16 Arthur Radichio Pipe freezer
EP2985505A1 (en) * 2014-08-11 2016-02-17 Spectronics Corporation Pipe freezer system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE135309C1 (en) *
US3559423A (en) * 1969-08-08 1971-02-02 Werner Scheidler Equipment for working on liquid-filled conduits
DE2330807A1 (en) * 1973-06-16 1975-01-09 Flomatic Corp Device for freezing a medium flowing within a pipe - restricts supply of refrigerant to required zone
US4370862A (en) * 1976-09-13 1983-02-01 Brister Incorporated Apparatus and method for freezing a slug of liquid in a section of a large diameter fluid transmission line
DE3232603A1 (en) * 1982-09-02 1984-03-08 Messer Griesheim Gmbh, 6000 Frankfurt DEVICE FOR FREEZING A LIQUID IN A PIPELINE

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE135309C1 (en) *
US3559423A (en) * 1969-08-08 1971-02-02 Werner Scheidler Equipment for working on liquid-filled conduits
DE2330807A1 (en) * 1973-06-16 1975-01-09 Flomatic Corp Device for freezing a medium flowing within a pipe - restricts supply of refrigerant to required zone
US4370862A (en) * 1976-09-13 1983-02-01 Brister Incorporated Apparatus and method for freezing a slug of liquid in a section of a large diameter fluid transmission line
DE3232603A1 (en) * 1982-09-02 1984-03-08 Messer Griesheim Gmbh, 6000 Frankfurt DEVICE FOR FREEZING A LIQUID IN A PIPELINE

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0559078A1 (en) * 1992-03-03 1993-09-08 Rothenberger Werkzeuge-Maschinen Gmbh Cooling clamp for freezing pipes
WO1994021955A1 (en) * 1993-03-18 1994-09-29 Lothar Beise Method and device for forming a plug in a conduit
EP0736721A1 (en) * 1995-04-08 1996-10-09 Winkler, Konrad, Dr.-Ing. habil. Device for stopping a leak in a reservoir
DE19617619A1 (en) * 1995-05-31 1996-12-12 Spectronics Corp Device or evaporator for freezing a pipe section
DE19617619C2 (en) * 1995-05-31 1998-07-16 Spectronics Corp Device for freezing a pipe section
WO2000068624A1 (en) 1999-05-06 2000-11-16 Arthur Radichio Pipe freezer
US6286329B1 (en) 1999-05-06 2001-09-11 Arthur Radichio Pipe freezer
EP2985505A1 (en) * 2014-08-11 2016-02-17 Spectronics Corporation Pipe freezer system
JP2016038199A (en) * 2014-08-11 2016-03-22 スペクトロニクス・コーポレイションＳｐｅｃｔｒｏｎｉｃｓ Ｃｏｒｐｏｒａｔｉｏｎ Pipe freezer system
US9574694B2 (en) 2014-08-11 2017-02-21 Spectronics Corporation Pipe freezer system

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