WO1990001658A1 - Agencement de montage d'appareil de chauffage - Google Patents

Agencement de montage d'appareil de chauffage Download PDF

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Publication number
WO1990001658A1
WO1990001658A1 PCT/GB1989/000891 GB8900891W WO9001658A1 WO 1990001658 A1 WO1990001658 A1 WO 1990001658A1 GB 8900891 W GB8900891 W GB 8900891W WO 9001658 A1 WO9001658 A1 WO 9001658A1
Authority
WO
WIPO (PCT)
Prior art keywords
conduit
housing
spring member
arrangement according
heated
Prior art date
Application number
PCT/GB1989/000891
Other languages
English (en)
Original Assignee
Raychem Sa
Raychem Limited
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 Raychem Sa, Raychem Limited filed Critical Raychem Sa
Publication of WO1990001658A1 publication Critical patent/WO1990001658A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1818—Arrangement or mounting of electric heating means
    • 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
    • F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
    • F16L53/30—Heating of pipes or pipe systems
    • F16L53/35—Ohmic-resistance heating
    • F16L53/38—Ohmic-resistance heating using elongate electric heating elements, e.g. wires or ribbons

Definitions

  • This invention relates to the mounting of an elongate heater on a surface to be heated, which may be the outer surface of a pipe for conveying a fluid.
  • the pipe may contain hot water and be part of a district heating system, or it may contain oil or other industrial liquids that need to be maintained above a cer ⁇ tain temperature level in order that they do not become too viscous to flow.
  • An elongate heater may be applied to the outer surface of a pipe in a number of ways.
  • an elongate heating tape may be helically wrapped around, or laid uni- directionally along, the pipe, and retained in place with fixing straps. Insulation in the form of tape or sheet wrappings, or polyurethane foam is then applied to the heat- traced pipe.
  • the method is very time-consuming to carry out.
  • a small bore tube may be fixed to, for example welded along, the pipe and the heater inserted therein. This method however can result in poor thermal transfer to the pipe, and thus to its contents, if the heater is too loose a fit in the tube, and if it is to be a tight fit then it can be difficult to instal.
  • the pipes are typically of 6 metre length and have the insulation cut back at their ends. The ends of the pipes are then welded together, the heater of one pipe is connected to that of the next, and the joint area is itself insulated. Thus, a joint in the heater is required at the end of every 6 metre section. Furthermore, should the heater need to be replaced, for example upgraded to one with a higher thermal output, access thereto can be difficult.
  • an arrangement for containing a heating element and suitable for mounting on a surface to be heated comprising a housing that defines an elongate conduit and that has an elongate spring member mounted within the conduit, and preferably substantially coter- minously therewith, so as to separate the conduit laterally into two portions, the spring member having a first pre ⁇ ferably stable position whereby, in operation, an elongate heating element can pass along a first portion of the con ⁇ duit and whereby on being displaced from the first position the spring member urges an inserted heating element into thermal contact with said surface.
  • the spring member is a lamina of generally rectangular configuration and its opposing elongate edges are located at positions on the inside of the housing that are spaced apart by a distance that is less than the width of the rectangular spring member.
  • the conduit, and also the housing may be of generally rectangular configuration.
  • the housing may have a non-rectangular configuration, for example of a smooth shape. In order to provide an overall smooth outer profile, the housing may be contoured to merge into the surface to be heated, or additional com ⁇ ponents may be secured thereto to achieve this result.
  • the spring member may be retained at its opposing elongate edges in respective longitudinal grooves in the inside of the housing.
  • the conduit preferably has an open side that faces the surface to be heated so that with a heater located in the first portion of the conduit and the sprir.g member displaced from the stable position, the heater is urged into good thermal contact with the surface and held there against the force of the spring.
  • the first portion of the con ⁇ duit may be closed, with an inserted heater being urged into good thermal contact with the closure by the action of the spring member, the closure itself then being urged into good thermal contact with the surface to be heated.
  • Air pressure introduced into a second portion of the conduit may be used to displace the spring member from its stable position, but preferably this displacement is achieved by movement of a displacing member, of generally wedge configuration, along the second portion of the conduit from one end thereof towards the other end.
  • the displacing member advantageously is pulled through the conduit from the other end by means of one or more wires or ropes attached thereto.
  • the displacing member may be guided by the housing as it is pulled along the conduit.
  • a single displacing member may be located at one end of the series, and the wire or other pulling means of one mounting arrangement mav be oined to that of the next. Accordingly, a single pulling means at the other end of the series can be activated to D ull t he displacing member through each of the second conduit por ⁇ tions. An elongate heater previously introduced along each of the first conduit portions will thus be urged towards the surface to be heated along the entire length of the multiple arrangement.
  • pre-insulated beatable surfaces such as pipes
  • Each length would comprise a pipe for example, a housing with fitted spring member mounted therein, all advan ⁇ tageously enclosed within thermal insulating material.
  • Pulling means such as a wire or rope may be pre-installed in the second conduit portions, and a displacing member may be provided for each length, but need only be provided for operation with a plurality of lengths.
  • An interconnecting member may be provided for adjoining pairs of housings, forming an interconnecting conduit between successive lengths.
  • the housing and any connection pieces and/or t he soring member and/or the surface to be heated may be made from metal, such as aluminium, or plastics, or other suitable material.
  • conduit yet still, on displacement of the spring member, be in good thermal contact with the surface to be heated.
  • the heater may be any suitable elongate heater, but preferably is a self-regulating heater sold by the Chemelex Division of Raychem, under its trade names AUTOTRACE, HWAT or WINTERGARD for example. Such heaters are typically about 10 to 13mm wide and about 5 to 8mm thick.
  • the housing will thus be dimensioned to be as small as possible to minimise its profile, and yet the conduit will be of sufficient dimensions conveniently to accept the heater and to allow the displacing means to operate freely.
  • a method of heating a surface comprising mounting on the surface a housing that defines an elongate conduit and that has an elongate spring member mounted in a stable position within the conduit substantially coterminously therewith so as to separate the conduit laterally into two portions, inserting the heater into a first portion of the conduit that lies between the spring member and the surface to be heated, and causing the spring member to be displaced from its stable position such that it urges the heater into thermal contact with the surface to be heated.
  • the housing of the invention may be arranged such that the spring member, when in operation is positioned so as to urge an inserted heater towards the surface to be heated, may be displaced back towards the stable position so that the heater can be conveniently removed.
  • displacement may conveniently by achieved bv means of the same displacing member, now being pulled along the firs t portion of the conduit that contains the heater.
  • Figure 1 is a cross-sectional elevation through a housing of the arrangement containing t h e spring member and a heater;
  • Figure 2 is a plan view of the displacing memoer in the conduit
  • Figure 3 is a section through the displacing mem D er along the line A-A of Figure 2 ;
  • Figure 4 is a section along the line A '-A' of Figure 3;
  • Figure 5 is a schematic elevation at a join t of t wo lengths of a pre-insulated housing.
  • Figure 6 is a section through a member for in t ercon ⁇ necting two lengths of the housing of Figure 1;
  • Figure 7 is a section through the housing of Figure 1 with a smoothing profile secured thereto.
  • an aluminium housing 2 is of generally rectangular cross-section open at one side, and is approximately 6 metres in length.
  • the housing 2 has three pairs of parallel grooves 4,6,8 extending all the way along its opposing side walls, and a rectangular lamina leaf spring 10 is located by its elongate longitudinal edges in the grooves 6 and extends from one end of the housing 2 to the other end.
  • the spring 10 is biassed into a flexed stable position as shown in full outline in Figure 1, and laterally divides the conduit 12 defined by the housing 2 into two portions 14,16.
  • the spring 10 forms a closure for the conduit 14, and is aisplaceable from its stable position in the direction of the open-sided conduit 16 whilst still being retained in the grooves 6.
  • a displacing wedge 18 has planar upper and side sur ⁇ faces, a smoothly contoured lower surface, and projections 24 at the corners of its leading and trailing edges.
  • a rope 26 in excess of 6 metres long is attached to the leading edge of the wedge 18.
  • the wedge 18 has two spaced apart pairs of guiding pegs 28, and is arranged to be introduced at one end of the housing 2 into the closed conduit portion 14 with the pegs 28 slidably engaged within the grooves 4, and with the rope 26 extending along the conduit 12 and emerging at its other end. Entry of the wedge 18 into the conduit is faciliated by the projections 24, and its guiding within the conduit is facilitated by the matching of its upper and side surfaces to the inner surface of tne housing 2. The rope 26 is pulled from the other end of the 6 metre long housing 2, and the wedge 18 is thus drawn along the conduit portion 14. By this action, and with little force, the spring 10 is engaged by the smooth lower surface of the wedge 18 and displaced from its stable position.
  • the housing 2 with the spring 10, and preferably, also the rope 26, in place, is loosely taped in a straight line along the outer surface of a steel pipe 30 of length slighly in excess of 6 metres, whose liquid contents are to be heated.
  • the housing 2 and an equal length of the pipe 30 are then thermally insulated with polyurethane foam 31.
  • Such a pre-insulated unit is ready for installation, for example by being one of a series of prepared pipes that are welded together to give a total length of say approximately 100 metres.
  • the ropes 26 of successive units can be tied together in the regions of the pipe joints 33, and a wedge 18 attached to one end of the continuous rope.
  • An aluminium housing connection piece 32 (as shown in detail in Figure 6) is clipped over the adja ⁇ cent ends of successive housings 2 at each pipe join t region, being secured together by interlocking ridges 34 and grooves 36 respectively on the inside cf the piece 32 an d the outside of the housing 2.
  • a pair of con ⁇ necting pieces 32 are used together with a short, bridging length of housing 2 with its associated spring 18.
  • a self-regulating Chemelex HWAT heater 38 is passed as a continuous length, of say 100 metres, from one end of the interconnected conduit portions 16, through successive housings 2, past joint regions 33 to emerge at the o t her end for termination, for connection to a power source, or for con ⁇ nection to another length of heater. It will thus be appre ⁇ ciated that a joint in the heater is not required at each region where the pipe has to be joined.
  • the heater 38 may be inserted at an earlier stage, for example after the pipes 30 have been joined and before the connection pieces 32 have been fitted and before the joint regions have been insu ⁇ lated.
  • the large cross-sectional area of the now-closed conduit portion 16 allows the relativelv small- sectioned heater 38 to be passed through long lengths of housings 2 very easily.
  • Good thermal contact of the heater 38 with the pipes 30 is then achieved by pulling the rope 26 to draw the wedge 18 smoothly through each housing 2 and connecting piece 32 from one end to the other.
  • the wedge 18 and rope 26 are then removed from the housing. in this way successive springs 10 are displaced from their stable posi ⁇ tion into the position shown in broken outline in Figure 1, thereby to contact the heater 38 and to urge this into, and maintain, positive thermal contact with the pipe 30.
  • heaters 38 of various dimensions may be used in a single size arrange ⁇ ment of housing and spring member, whilst still retaining the advantages of ease of insertion and good thermal contact for the heater.
  • the aluminium housing 2 is to be mounted on a generally flat surface 40 which may be an indoor or outdoor floor for example, that needs to be heated for space heating or for prevention of the formation of ice thereon, for example.
  • the housing 2 may need to be covered by a floor covering or other material, and the edges of its rectangular con ⁇ figuration may be a disadvantage.
  • the housing 2 may itself be modified in shape such that is provides a smoothly contoured outer surface, it is envisaged that for convenience of manufacturing of housings, and for good inventory control, one design of housing, such as the housing 2 for example, would be used, and one or more con ⁇ touring profiles be supplied where and when required.
  • an elongate aluminium profile 42 has a flat base 44 and a rectangular channel 46 with internal ridges 48 extending along its upper surface.
  • the channel 46 is arranged to receive the housing 2 as a push fit therein, with the ridges 48 retaining the housing 2 by sliding engagement with the housing outer grooves 36.
  • the profile 42 has an upper sur ⁇ face 50 that extends smoothly away on each side of the chan ⁇ nel 46 to its base 44, and has provision for screw mounting on to the flat surface 40. It can be seen that a portion 52 of the base 44 separates the heater 38 from the surface 40, but this is a small thickness of a good thermally conducting material.
  • a pair of profiles could be mounted one on each side of the housing 2, dispensing with the intermediate portion 52 and thus allowing direct contact between the heater 2 and the surface 40.
  • the present invention may be used with pipes, or other surfaces to be heated, that are of a single continuous length that is other than the 6 metres referred to herein by way of example.

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)
  • Pipe Accessories (AREA)
  • Resistance Heating (AREA)

Abstract

Un câble (28) d'appareil de chauffage est monté en bon contact thermique avec le substrat (3) à chauffer par le fait qu'il se situe sur ce dernier à l'intérieur d'un logement (2). Ledit logement comporte un conduit (12) contenant un ressort (10) lequel dans une première position est sollicité à l'opposé du substrat (3) et ménage une grande ouverture (16) à travers laquelle on peut commodément tirer le câble (2). On fait ensuite passer une lame (18) dans le conduit (12) de manière à pousser le ressort (10) dans une seconde position poussant l'appareil de chauffage (38) contre le substrat (30).
PCT/GB1989/000891 1988-08-05 1989-08-03 Agencement de montage d'appareil de chauffage WO1990001658A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8818684.6 1988-08-05
GB888818684A GB8818684D0 (en) 1988-08-05 1988-08-05 Heater mounting arrangement

Publications (1)

Publication Number Publication Date
WO1990001658A1 true WO1990001658A1 (fr) 1990-02-22

Family

ID=10641689

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1989/000891 WO1990001658A1 (fr) 1988-08-05 1989-08-03 Agencement de montage d'appareil de chauffage

Country Status (2)

Country Link
GB (1) GB8818684D0 (fr)
WO (1) WO1990001658A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5081023A (en) * 1989-01-20 1992-01-14 Toyo Yozo Company, Ltd. Antibiotic l53-18a and process for preparation thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1108673A (en) * 1964-10-08 1968-04-03 Thermon Mfg Co Heat transfer apparatus
EP0021597A2 (fr) * 1979-06-21 1981-01-07 Eaton Corporation Dispositif de transfert de chaleur permettant de fixer de façon amovible des moyens chauffants ou réfrigérants sur un tube
WO1988005988A1 (fr) * 1987-02-09 1988-08-11 Bylin Heating Systems, Inc. Procede et agencement de chauffage et d'isolation pour un reseau de conduites installees

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1108673A (en) * 1964-10-08 1968-04-03 Thermon Mfg Co Heat transfer apparatus
EP0021597A2 (fr) * 1979-06-21 1981-01-07 Eaton Corporation Dispositif de transfert de chaleur permettant de fixer de façon amovible des moyens chauffants ou réfrigérants sur un tube
WO1988005988A1 (fr) * 1987-02-09 1988-08-11 Bylin Heating Systems, Inc. Procede et agencement de chauffage et d'isolation pour un reseau de conduites installees

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5081023A (en) * 1989-01-20 1992-01-14 Toyo Yozo Company, Ltd. Antibiotic l53-18a and process for preparation thereof

Also Published As

Publication number Publication date
GB8818684D0 (en) 1988-09-07

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