FR2517501A1 - Heat source for electric convection heater - uses diffuser formed from slotted strip cut along its length to permit alternate segments to be bent in opposite directions - Google Patents

Heat source for electric convection heater - uses diffuser formed from slotted strip cut along its length to permit alternate segments to be bent in opposite directions Download PDF

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Publication number
FR2517501A1
FR2517501A1 FR8219501A FR8219501A FR2517501A1 FR 2517501 A1 FR2517501 A1 FR 2517501A1 FR 8219501 A FR8219501 A FR 8219501A FR 8219501 A FR8219501 A FR 8219501A FR 2517501 A1 FR2517501 A1 FR 2517501A1
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FR
France
Prior art keywords
diffuser
air
resistor
convection heater
fins
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
FR8219501A
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French (fr)
Inventor
Norbert Ganz
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.)
PROMOTHERMO VERWARMINGTOEPASSI
Original Assignee
PROMOTHERMO VERWARMINGTOEPASSI
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 PROMOTHERMO VERWARMINGTOEPASSI filed Critical PROMOTHERMO VERWARMINGTOEPASSI
Publication of FR2517501A1 publication Critical patent/FR2517501A1/en
Pending legal-status Critical Current

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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
    • F24H3/00—Air heaters
    • F24H3/002—Air heaters using electric energy supply
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
    • H05B3/50—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material heating conductor arranged in metal tubes, the radiating surface having heat-conducting fins

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Direct Air Heating By Heater Or Combustion Gas (AREA)

Abstract

The heat source for an electric convection heater has an enclosed electric resistance (1) and a diffuser (2) giving augmentation of the surface area exchanging heat with the air. The diffuser (2) starts as flat strip, then has slots machined at intervals along its length to further increase the available heat transfer area. The diffuser is then fitted to the resistance. The slotted diffuser strip is then cut between groups of slots to permit alternate groups of slots to be bent in opposite directions away from the vertical so as to span the greater part of the width of the convection heater enclosure, with the relative dimensions chosed to ensure mixing of hot and cold air in the region of the diffuser.

Description

CORPS DE CHAUFFE POUR CONVECTEUR ELECTRIQUE
L'invention a pour objet un corps de chauffe pour convecteur électrique de chauffage d'un local.HEATING BODY FOR ELECTRIC CONVECTOR
The subject of the invention is a heating body for an electric convector for heating a room.

Les corps de chauffe usuels pour convecteurs électriques comprennent une résistance blindée et - un diffuseur permettant d'augmenter la surface d'échange entre la résistance et l'air circulant par convection naturelle au travers du convecteur électrique. The usual heating bodies for electric convectors include an armored resistance and - a diffuser making it possible to increase the exchange surface between the resistance and the air circulating by natural convection through the electric convector.

Afin d'améliorer encore les conditions d'échange, le corps de chauffe selon l'invention est caractérisé en ce qu'avant assemblage avec la résistance mais après usinage par persiennage, le diffuseur (2) conserve une surface planne et sans aspérité tant dans la (les) partie (s) usinée (s) que dans la (les) partie (s) non persiennée (s). In order to further improve the exchange conditions, the heating body according to the invention is characterized in that before assembly with the resistance but after machining by lamination, the diffuser (2) retains a flat surface and without roughness both in the machined part (s) only in the non-persisted part (s).

Le dessin annexé représente schématiquement et à titre d'exemple une forme d'exécution du corps de chauffe selon l'invention et une variante. The accompanying drawing shows schematically and by way of example an embodiment of the heating body according to the invention and a variant.

La figure 1 en est une vue en coupe du corps de chauffe monté dans un convecteur électrique. Figure 1 is a sectional view of the heater body mounted in an electric convector.

La figure 2 est une vue en plan du diffuseur. Figure 2 is a plan view of the diffuser.

La figure 3 est une vue en coupe du diffuseur représenté à la figure 2. FIG. 3 is a sectional view of the diffuser shown in FIG. 2.

La figure 4 est une vue en coupe du diffuseur monté sur la résistance. Figure 4 is a sectional view of the diffuser mounted on the resistor.

La figure 5 est une vue en coupe d'un convecteur comprenant deux corps de chauffe. Figure 5 is a sectional view of a convector comprising two heating bodies.

Dans le convecteur électrique représenté à la figure 1, la résistance blindée (I) se présente sous la forme d'un cylindre de petit diamètre et de grande longueur.  In the electric convector shown in Figure 1, the shielded resistor (I) is in the form of a cylinder of small diameter and great length.

Le diffuseur (2) est une plaque métallique enroulée autour de la résistance blindée et fixée en (3) par soudure, rivetage ou vissage, ou tout autre mode de fixation. The diffuser (2) is a metal plate wound around the armored resistor and fixed in (3) by welding, riveting or screwing, or any other method of fixing.

Au moins une des extrémités (4) libre de la plaque est usinée en forme de "persienne", c'est-à-dire que l'on procède à des incisions distantes l'une de l'autre d'un certain pas dans la plaque selon une ligne située dans le plan de la plaque et sensiblement perpendiculaire à l'axe d'enroulement de la plaque autour de la résistance.Chaque lame ainsi obtenue est ensuite relevée de telle sorte que l'on obtienne un compromis entre ltefficacité de l'échange thermique entre la plaque et l'air et les pertes de charge de l'air qui entre dans l'appareil selon la flèche (5) et - en ressort selon la flèche
Dans le convecteur représenté à la figure 1 l'air passant sur la résistance ou auprès d'elle est à une température nettement plus élevée que la température de l'air circulant plus loin d'elle.At least one of the free ends (4) of the plate is machined in the form of a "louver", that is to say that incisions are made which are spaced apart from each other by a certain pitch in the plate along a line located in the plane of the plate and substantially perpendicular to the axis of winding of the plate around the resistance. Each blade thus obtained is then raised so that a compromise is obtained between the effectiveness of the heat exchange between the plate and the air and the pressure losses of the air which enters the device according to the arrow (5) and - leaves it according to the arrow
In the convector shown in Figure 1 the air passing over the resistance or near it is at a temperature significantly higher than the temperature of the air flowing further from it.

Comme représenté à la figure 5, on peut être amene à mettre deux résistances dans le même appareil et l'on obtient alors deux lignes d'air plus chaud que le reste de l'air. As shown in Figure 5, we can be brought to put two resistors in the same device and then we get two lines of air hotter than the rest of the air.

Dans ce cas, la disposition des résistances et du diffuseur permet d'obtenir une amélioration de lthomogénéité de la température d'air de sortie
On a représenté à la figure 2 une vue de dessus du diffuseur avant qu'il ne soit enroulé autour de la résistance et à la figure 3 une vue en coupe de ce même diffuseur.In this case, the arrangement of the resistors and the diffuser makes it possible to obtain an improvement in the uniformity of the outlet air temperature.
There is shown in Figure 2 a top view of the diffuser before it is wound around the resistor and in Figure 3 a sectional view of the same diffuser.

Le diffuseur (2) présente la particularité de présenter des ailettes (8) pliées à angle droit par rapport au plan du diffuseur, les ailettes (8) d'un des côtés étant décalées dans le sens de l'axe d'enroulement x x' d'un demi pas par rapport aux ailettes (9).  The diffuser (2) has the particularity of having fins (8) bent at right angles to the plane of the diffuser, the fins (8) on one side being offset in the direction of the winding axis xx ' half a step from the fins (9).

On a représenté à la figure 4 la résistance munie de son diffuseur. FIG. 4 shows the resistance provided with its diffuser.

Le diffuseur (10) est enroulé autour de la résistance (il) de telle sorte que les ailettes (12) et (13) se trouvent opposées quand les deux moitiés du diffuseur se rejoignent selon le plan y y'. The diffuser (10) is wrapped around the resistor (il) so that the fins (12) and (13) are opposite when the two halves of the diffuser meet along the plane y y '.

L'angle du pliage entre les plans y y et z z' résulte de la mise en place dans l'appareil de deux diffuseurs de sorte que les conditions décrites ci-après soient réalisées. The angle of the folding between the planes y y and z z ′ results from the installation in the device of two diffusers so that the conditions described below are fulfilled.

Comme représenté en coupe à la figure 5 un convecteur muni de deux corps de chauffe permet d'obtenir une disposition particulièrement avantageuse quand les extrémités (14) et (15) des diffuseurs (16) et (17) se rejoignent ou presque, de telle sorte que peu ou pas d'air ne puisse passer entre eux. As shown in section in FIG. 5, a convector provided with two heating bodies makes it possible to obtain a particularly advantageous arrangement when the ends (14) and (15) of the diffusers (16) and (17) meet or almost meet, such so that little or no air can pass between them.

La distance entre la résistance (18) et la paroi (19) d'une part et la distance entre la résistance (20) et la paroi (21) d'autre part permettent de faire varier la quantité d'air ne passant pas au-travers des deux diffuseurs (16) et (17), air qui se mélangeant à !'air passant sur les résistances et la partie du diffuseur la plus proche des résistances qui est la plus chaude donne en sortie de l'appareil une température d'air voisine des températures de l'air qui, après avoir passé sur les diffuseurs (16) et (17), constitue le centre de la veine d'air de sortie.  The distance between the resistor (18) and the wall (19) on the one hand and the distance between the resistor (20) and the wall (21) on the other hand make it possible to vary the amount of air not passing through the -through two diffusers (16) and (17), air which mixes with the air passing over the resistors and the part of the diffuser closest to the resistances which is the warmest gives a temperature of air close to the air temperatures which, after passing over the diffusers (16) and (17), constitutes the center of the outlet air stream.

Claims (4)

RevendicationsClaims 1. Corps de chauffe pour convecteur électrique constitué d'une résistance blindée (I) et d'un diffuseur (2) permettant d'augmenter la surface d'échange entre la résistance et l'air, c a r a c t é r i s é en ce que, avant assemblage avec la résistance (1), mais après usinage pour persiennage, le diffuseur (2) conserve une surface plane et sans aspérité tant dans la (les) partie (s) usinée (s) que dans la (les) partie (s) non persiennées (s).1. Heating body for an electric convector consisting of an armored resistor (I) and a diffuser (2) enabling the exchange surface between the resistor and the air to be increased, characterized in that, before assembly with the resistor (1), but after machining for lamination, the diffuser (2) retains a flat and uneven surface both in the part (s) machined (s) and in the part (s) ) not persisted. 2. Corps de chauffe selon la revendication 1, c a r a c t é r i s é en ce que le diffuseur (2) comporte deux rangées d'ailettes (8, 9) ayant un pas donné, l'une (8) des deux rangées d'ailettes étant décalée dans le sens longitudinal d'un demi pas par rapport aux ailettes de l'autre rangée (9), de telle sorte que par pliage on puisse réaliser avec un seul diffuseur deux rangées d'ailettes quinconcées.2. A heater according to claim 1, characterized in that the diffuser (2) comprises two rows of fins (8, 9) having a given pitch, one (8) of the two rows of fins being offset in the longitudinal direction by a half pitch with respect to the fins of the other row (9), so that by folding one can achieve with a single diffuser two rows of staggered fins. 3. Corps de chauffe pour convecteur électrique comportant un diffuseur selon les revendications 1 et 2, c a r a c t é r i s é en ce que, monté dans un carter (7), la distance entre la résistance (1) et la paroi du carter (7) est telle que l'air froid et l'air chaud se mélangent pour donner un air à température voisine de celle donnée par le diffuseur (2).3. Heating body for an electric convector comprising a diffuser according to claims 1 and 2, characterized in that, mounted in a housing (7), the distance between the resistor (1) and the wall of the housing (7) is such that cold air and hot air mix to give air at a temperature close to that given by the diffuser (2). 4. Corps de chauffe selon la revendication 3, obtenu à partir de deux résistances blindées (18, 20), monté symétriquement par rapport au plan médian vertical longitudinal de l'appareil de telle sorte que l'espace entre les extrémités (14, 15) des deux diffuseurs les plus éloignées des résistances blindées (18, 20) ne laisse pratiquement passer aucun air non chauffé. 4. Heating body according to claim 3, obtained from two armored resistors (18, 20), mounted symmetrically with respect to the longitudinal vertical median plane of the device so that the space between the ends (14, 15 ) from the two diffusers furthest from the shielded resistors (18, 20) allows practically no unheated air to pass.
FR8219501A 1981-12-01 1982-11-22 Heat source for electric convection heater - uses diffuser formed from slotted strip cut along its length to permit alternate segments to be bent in opposite directions Pending FR2517501A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH768681 1981-12-01

Publications (1)

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FR2517501A1 true FR2517501A1 (en) 1983-06-03

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FR8219501A Pending FR2517501A1 (en) 1981-12-01 1982-11-22 Heat source for electric convection heater - uses diffuser formed from slotted strip cut along its length to permit alternate segments to be bent in opposite directions

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2764162A1 (en) * 1997-05-27 1998-12-04 Muller Et Cie Reinforced electrical resistance with multiple dissipators manufacturing procedure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR803139A (en) * 1935-06-11 1936-09-23 Improvements to heating radiators
FR2323108A1 (en) * 1975-09-03 1977-04-01 Sepro Heating element for convector heater - has heat-exchange fins divided into sections along resistance wire
FR2339150A1 (en) * 1976-01-23 1977-08-19 Tugonia Ag HEAT EXCHANGER FOR CONVECTION HEATING APPLIANCES

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR803139A (en) * 1935-06-11 1936-09-23 Improvements to heating radiators
FR2323108A1 (en) * 1975-09-03 1977-04-01 Sepro Heating element for convector heater - has heat-exchange fins divided into sections along resistance wire
FR2339150A1 (en) * 1976-01-23 1977-08-19 Tugonia Ag HEAT EXCHANGER FOR CONVECTION HEATING APPLIANCES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2764162A1 (en) * 1997-05-27 1998-12-04 Muller Et Cie Reinforced electrical resistance with multiple dissipators manufacturing procedure

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