EP0693662A1 - Cleaning method for heating elements of an air heating system, esp. clotches-drier - Google Patents
Cleaning method for heating elements of an air heating system, esp. clotches-drier Download PDFInfo
- Publication number
- EP0693662A1 EP0693662A1 EP95401683A EP95401683A EP0693662A1 EP 0693662 A1 EP0693662 A1 EP 0693662A1 EP 95401683 A EP95401683 A EP 95401683A EP 95401683 A EP95401683 A EP 95401683A EP 0693662 A1 EP0693662 A1 EP 0693662A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- overheating
- cycle
- heating element
- heating
- heating elements
- 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.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims description 20
- 238000004140 cleaning Methods 0.000 title claims description 5
- 238000013021 overheating Methods 0.000 claims abstract description 27
- 238000001035 drying Methods 0.000 claims abstract description 10
- 239000003570 air Substances 0.000 description 13
- 239000004020 conductor Substances 0.000 description 8
- 238000009825 accumulation Methods 0.000 description 5
- 230000035508 accumulation Effects 0.000 description 5
- 239000000428 dust Substances 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000010445 mica Substances 0.000 description 2
- 229910052618 mica group Inorganic materials 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000010339 dilation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 244000144992 flock Species 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F58/00—Domestic laundry dryers
- D06F58/20—General details of domestic laundry dryers
- D06F58/26—Heating arrangements, e.g. gas heating equipment
Definitions
- the present invention relates to a method for cleaning the heating elements of an air heating system. It applies in particular to the heating elements of tumble dryers, the latter being condensing or circulating air.
- open fire heating elements consist of resistive turns kept isolated from the metal structure for example by mica or soapstone elements. These heating elements at open fire are advantageous because they allow in particular good heat exchanges, they have a low thermal inertia and radiate heat satisfactorily.
- the surface occupied by the heating wires must occupy the maximum cross-section of air.
- the turns are very nested between them. They are staggered, for example.
- Another solution could be to increase the number of filters upstream of the heating elements, but such a solution is too expensive.
- the object of the invention is to overcome the aforementioned drawbacks, and in particular to make it possible to prevent laundry fluff from forming on dryer heating elements, and that in an economical manner.
- the subject of the invention is a method of cleaning a heating element of an air heating system, characterized in that it consists, during an operating cycle, of creating an overheating of the heating element for at least a controlled period of time.
- the main advantages of the invention are that it adapts to all air heating systems comprising heating elements of the type of those with open fire, in particular to tumble dryers, that it adapts equally well to machines with electronic control than with electromechanical control, which it allows in certain cases not to release odor, and which it is simple to implement.
- FIG. 1 represents by FIG. 1, an exemplary embodiment of a heating element of a dryer.
- Figure 1 shows an exemplary embodiment of a heating element with open fire used in a dryer.
- This is for example made up of turns 1 corresponding to one or more resistive conductors in parallel. These turns actually form helical electrical conductors with spirals. these conductors are kept isolated from each other and from the structure of the dryer by insulating supports 2, in mica for example.
- the dust and the stuffing of linen deposited on the turns and between them obstructing the passage of air between them, cause the degradation of the heating element, by obstruction of this passage in particular or by deformation then breakage of one or more helical conductors. They can also cause ignition.
- the method according to the invention consists during an operating cycle, preferably at each cycle, of creating an overheating of the heating element for at least one controlled period of time.
- the method therefore consists in a drying cycle, preferably in each cycle, to create an overheating of the heating element for at least a period of time. control. Several periods of overheating can be achieved in each cycle.
- This overheating can be achieved for example by reducing the flow of air passing through the heating element, in particular by eliminating it. It can also be carried out for example by increasing the intensity of current passing through the electrical conductors of the heating element, by causing for example a momentary overcurrent.
- periods of overheating lasting only a few seconds are sufficient, to suppress the accumulations produced, when they are executed regularly, preferably at each drying cycle.
- the regulatory safety circuit breakers against accidental overheating also have, for example, reaction times greater than the duration of the overheating periods used in the method according to the invention. In this way no untimely machine shutdown occurs.
- the duration of the overheating period can be a few seconds, 4 to 5 seconds for example. In fact, it lasts the time necessary for the surface temperature of the electrical conductors of the heating element to allow it burn the accumulating elements that have gathered around it.
- Overheating can for example be carried out at the start of the cycle, or even at the end of the cycle. It can also be executed in the middle of the cycle, and more generally at any time during the cycle.
- An additional advantage of the method according to the invention is that it does not give off an odor since the overheating operation can be carried out at each cycle.
- the method according to the invention is not limited only to cleaning the heating elements of a tumble dryer, but more generally to all air heating systems based on heating elements of the open fire type in particular. If the air heating system has long operating cycles, especially if it is an ambient air heating system for building interiors, several short-term overheats for example, can be performed in the operating cycle.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Drying Of Solid Materials (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
- Control Of Washing Machine And Dryer (AREA)
Abstract
Description
La présente invention concerne un procédé de nettoyage des éléments chauffant d'un système de chauffage d'air. Elle s'applique notamment aux éléments chauffant de sèche-linge, ces derniers étant à condensation ou à circulation d'air.The present invention relates to a method for cleaning the heating elements of an air heating system. It applies in particular to the heating elements of tumble dryers, the latter being condensing or circulating air.
La plupart des sèche-linge utilisent maintenant la technique de chauffage de l'air par éléments chauffant dits à "feu nu". Ces éléments chauffant sont constitués de spires résistives maintenues isolées de la structure métallique par exemple par du mica ou des éléments de stéatite. Ces éléments chauffant à feu nu sont avantageux car ils permettent notamment de bons échanges thermiques, ils possèdent une faible inertie thermique et rayonnent la chaleur de façon satisfaisante.Most dryers now use the air heating technique called "open fire" heating elements. These heating elements consist of resistive turns kept isolated from the metal structure for example by mica or soapstone elements. These heating elements at open fire are advantageous because they allow in particular good heat exchanges, they have a low thermal inertia and radiate heat satisfactorily.
Pour améliorer encore l'échange thermique entre la source de chaleur constituée de ces éléments chauffant à feu nu et l'air, la surface occupé par les fils chauffant doit occuper au maximum la section d'air de passage. Pour cela les spires sont très imbriquées entre elles. Elles sont placées en quinconce par exemple.To further improve the heat exchange between the heat source made up of these heating elements with open fire and the air, the surface occupied by the heating wires must occupy the maximum cross-section of air. For this the turns are very nested between them. They are staggered, for example.
Or, dans les sèche-linge à condensation et dans une moindre mesure dans les sèche-linge à évacuation, de la poussière et de la bourre de linge viennent s'accrocher à ces spires. Avec le temps, une dégradation des éléments chauffant peu se produire ainsi qu'une prise de feu de la bourre de linge. Un autre inconvénient est que la section de passage d'air diminue, ce qui peut altérer grandement le rendement du sèche-linge.However, in condensing dryers and to a lesser extent in exhaust dryers, dust and fluff of laundry cling to these turns. Over time, degradation of the heating elements can occur as well as a catch of fluff of the linen. Another disadvantage is that the air passage section decreases, which can greatly affect the performance of the dryer.
Le phénomène d'encrassement, notamment de bourrage, étant d'autant plus sensible que les spires sont rapprochées, une solution diminuant ses effets peut consister à éloigner les spires les unes des autres. Cependant une telle solution ne permet pas d'améliorer l'échange thermique comme expliqué précédemment et surtout risque de s'avérer insuffisante. En effet, la bourre de linge s'accrochant aux spires, risque de créer des dilatations et des déformations de celles-ci qui finissent éventuellement par casser, et cela qu'elles soient rapprochées ou non les unes des autres.The phenomenon of fouling, in particular of stuffing, being all the more sensitive as the turns are brought closer together, a solution reducing its effects may consist in moving the turns away from each other. However, such a solution does not make it possible to improve the heat exchange as explained above and, above all, risks proving to be insufficient. Indeed, the flock of linen clinging to the turns, risks creating dilations and deformations of these which eventually end up breaking, and that whether or not they are brought close to each other.
Une autre solution pourrait consister à augmenter le nombre de filtres en amont des éléments chauffant, mais une telle solution est trop onéreuse.Another solution could be to increase the number of filters upstream of the heating elements, but such a solution is too expensive.
Le but de l'invention est de pallier les inconvénients précités, et de permettre notamment d'empêcher que de la bourre de linge se constitue sur des éléments chauffant de sèche-linge, et cela de façon économique.The object of the invention is to overcome the aforementioned drawbacks, and in particular to make it possible to prevent laundry fluff from forming on dryer heating elements, and that in an economical manner.
A cet effet, l'invention a pour objet un procédé de nettoyage d'un élément chauffant d'un système de chauffage d'air, caractérisé en ce qu'il consiste lors d'un cycle de fonctionnement à créer une surchauffe de l'élément chauffant pendant au moins une période de temps contrôlée.To this end, the subject of the invention is a method of cleaning a heating element of an air heating system, characterized in that it consists, during an operating cycle, of creating an overheating of the heating element for at least a controlled period of time.
L'invention a pour principaux avantages qu'elle s'adapte à tous systèmes de chauffage de l'air comportant des éléments chauffant du type de ceux à feu nu notamment à des sèche-linge, qu'elle s'adapte aussi bien à des machines à commande électronique qu'à commande électromécanique, qu'elle permet dans certains cas de ne pas dégager d'odeur, et qu'elle est simple à mettre en oeuvre.The main advantages of the invention are that it adapts to all air heating systems comprising heating elements of the type of those with open fire, in particular to tumble dryers, that it adapts equally well to machines with electronic control than with electromechanical control, which it allows in certain cases not to release odor, and which it is simple to implement.
D'autre caractéristiques et avantages de l'invention apparaîtront à l'aide de la description qui suit, faite en regard du dessin annexé qui représente par la figure 1, un exemple de réalisation d'un élément chauffant de sèche-linge.Other characteristics and advantages of the invention will become apparent with the aid of the description which follows, given with reference to the appended drawing which represents by FIG. 1, an exemplary embodiment of a heating element of a dryer.
La figure 1, présente un exemple de réalisation d'un élément chauffant à feu nu utilisé dans un sèche-linge. Celui-ci est par exemple constitué de spires 1 correspondant à un ou plusieurs conducteurs résistifs en parallèle. Ces spires forment en fait des conducteurs électriques hélicoïdaux à spirales. ces conducteurs sont maintenus isolés les uns des autres ainsi que de la structure du sèche-linge par des support isolants 2, en mica par exemple. La poussière et la bourre de linge déposés sur les spires et entre elles obstruant le passage de l'air entre ces dernières, provoquent la dégradation de l'élément chauffant, par obstruction de ce passage notamment ou par déformation puis cassure d'un ou plusieurs conducteurs hélicoïdaux. Ils peuvent aussi provoquer une mise à feu.Figure 1 shows an exemplary embodiment of a heating element with open fire used in a dryer. This is for example made up of
Pour empêcher toute accumulation de poussière ou de bourre de linge sur un élément chauffant, le procédé selon l'invention consiste lors d'un cycle de fonctionnement, de préférence à chaque cycle, à créer une surchauffe de l'élément chauffant pendant au moins une période de temps contrôlée. Dans le cas d'application à un sèche-linge, le procédé consiste donc lors d'un cycle de séchage, de préférence à chaque cycle, à créer une surchauffe de l'élément chauffant pendant au moins une période de temps contrôlé. Plusieurs périodes de surchauffe peuvent être réalisées à chaque cycle.To prevent any accumulation of dust or linen fluff on a heating element, the method according to the invention consists during an operating cycle, preferably at each cycle, of creating an overheating of the heating element for at least one controlled period of time. In the case of application to a dryer, the method therefore consists in a drying cycle, preferably in each cycle, to create an overheating of the heating element for at least a period of time. control. Several periods of overheating can be achieved in each cycle.
Cette surchauffe peut être réalisée par exemple en diminuant le flux d'air traversant l'élément chauffant, en le supprimant notamment. Elle peut aussi être réalisée par exemple en augmentant l'intensité de courant passant dans les conducteurs électriques de l'élément chauffant, en provoquant par exemple un surcourant momentané.This overheating can be achieved for example by reducing the flow of air passing through the heating element, in particular by eliminating it. It can also be carried out for example by increasing the intensity of current passing through the electrical conductors of the heating element, by causing for example a momentary overcurrent.
Les expériences réalisées par la déposante ont montré qu'en surchauffant régulièrement l'élément chauffant, par exemple à chaque cycle de séchage, et cela pendant quelques secondes seulement, par exemple cinq secondes environ, la poussière et la bourre de linge ne s'agglutinaient pas sur les conducteurs électriques de l'élément chauffant. La température de surface des conducteurs dépassant par exemple 300°C en quelques secondes, l'accumulation de poussière ou d'éléments de bourre de linge est désagrégée. Cette désagrégation est notamment possible car l'accumulation est faible puisque l'opération de surchauffe est effectuée régulièrement, à chaque cycle de séchage par exemple. Dans ce dernier cas, la faible accumulation réalisée d'un cycle à l'autre est ainsi entièrement désagrégée. Les produits de la désagrégation sont ensuite éliminés ou plutôt évacués par le flux d'air traversant l'élément chauffant.The experiments carried out by the applicant have shown that by regularly overheating the heating element, for example at each drying cycle, and this for only a few seconds, for example about five seconds, the dust and the fluff of laundry do not clump together not on the electrical conductors of the heating element. Since the surface temperature of the conductors exceeds 300 ° C. for example in a few seconds, the accumulation of dust or laundry stuffing elements is disaggregated. This disaggregation is in particular possible because the accumulation is low since the overheating operation is carried out regularly, at each drying cycle for example. In the latter case, the small accumulation produced from one cycle to the next is thus entirely disaggregated. The disintegration products are then eliminated or rather evacuated by the air flow passing through the heating element.
La déposante a vérifié que contrairement à ce que pourrait laisser prévoir les habitudes de sécurité et de fiabilité, ces surchauffes régulières sont compatibles avec les normes de sécurité imposées, notamment sur les sèche-linge. En particulier, parce qu'elle a montré que des périodes de surchauffe durant seulement quelques secondes étaient suffisantes, pour supprimer les accumulations produites, quand elles sont éxécutées de façon régulière, de préférence à chaque cycle de séchage. Les coupe-circuit réglementaires de sécurité contre les surchauffes accidentelles ont par ailleurs par exemple des temps de réaction supérieurs à la durée des périodes de surchauffe utilisées dans le procédé selon l'invention. De cette façon aucun arrêt intempestif de la machine ne se produit. La durée de la période de surchauffe peut être de quelques secondes, 4 à 5 secondes par exemple. En fait, elle dure le temps nécessaire à ce que la température de surface des conducteurs électriques de l'élément chauffant permette à celle-ci de brûler les éléments d'accumulation s'étant agglutinés autour de celui-ci.The applicant verified that, contrary to what security and reliability habits might suggest, these regular overheats are compatible with the safety standards imposed, in particular on tumble dryers. In particular, because it has shown that periods of overheating lasting only a few seconds are sufficient, to suppress the accumulations produced, when they are executed regularly, preferably at each drying cycle. The regulatory safety circuit breakers against accidental overheating also have, for example, reaction times greater than the duration of the overheating periods used in the method according to the invention. In this way no untimely machine shutdown occurs. The duration of the overheating period can be a few seconds, 4 to 5 seconds for example. In fact, it lasts the time necessary for the surface temperature of the electrical conductors of the heating element to allow it burn the accumulating elements that have gathered around it.
La surchauffe peut par exemple être réalisée en début de cycle, ou encore en fin de cycle. Elle peut aussi être éxécutée en milieu de cycle, et plus généralement à n'importe quel moment du cycle.Overheating can for example be carried out at the start of the cycle, or even at the end of the cycle. It can also be executed in the middle of the cycle, and more generally at any time during the cycle.
Dans le cas d'application à un sèche-linge, si le cycle de séchage est commandé par un microprocesseur, le coût supplémentaire sur chaque sèche-linge pour la mise en oeuvre du procédé selon l'invention est nul, car le matériel reste identique, seules quelques lignes de programmes doivent alors êtres ajoutées dans la mémoire du microprocesseur.In the case of application to a dryer, if the drying cycle is controlled by a microprocessor, the additional cost on each dryer for implementing the method according to the invention is zero, because the material remains identical , only a few lines of programs should then be added to the microprocessor's memory.
Dans le cas où le cycle de séchage est commandé par un programmateur électromécanique, seule une came supplémentaire doit être par exemple ajoutée à ce dernier et le surcoût est ici très faible.In the case where the drying cycle is controlled by an electromechanical programmer, only an additional cam must for example be added to the latter and the additional cost here is very low.
Un avantage supplémentaire du procédé selon l'invention est qu'il n'entraîne pas de dégagement d'odeur puisque l'opération de surchauffe peut être effectuée à chaque cycle.An additional advantage of the method according to the invention is that it does not give off an odor since the overheating operation can be carried out at each cycle.
Enfin, le procédé selon l'invention ne se limite pas seulement au nettoyage des éléments chauffant de sèche-linge, mais plus généralement à tous systèmes de chauffage de l'air à base d'éléments chauffant de type à feu nu notamment. Si le système de chauffage de l'air possède des cycles de fonctionnement de longue durée, notamment s'il s'agit d'un système de chauffage de l'air ambiant pour des intérieurs de bâtiments, plusieurs surchauffe de courtes durée par exemple, peuvent être réalisées dans le cycle de fonctionnement.Finally, the method according to the invention is not limited only to cleaning the heating elements of a tumble dryer, but more generally to all air heating systems based on heating elements of the open fire type in particular. If the air heating system has long operating cycles, especially if it is an ambient air heating system for building interiors, several short-term overheats for example, can be performed in the operating cycle.
Claims (10)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9409100A FR2722869B1 (en) | 1994-07-22 | 1994-07-22 | 1 PROCEDURE FOR CLEANING ELEMENTS C2 AIR HEATING, ESPECIALLY ONE DRY |
| FR9409100 | 1994-07-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0693662A1 true EP0693662A1 (en) | 1996-01-24 |
| EP0693662B1 EP0693662B1 (en) | 1998-01-14 |
Family
ID=9465662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95401683A Expired - Lifetime EP0693662B1 (en) | 1994-07-22 | 1995-07-13 | Cleaning method for heating elements of an air heating system, esp. clothes-drier |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0693662B1 (en) |
| DE (1) | DE69501438T2 (en) |
| ES (1) | ES2111375T3 (en) |
| FR (1) | FR2722869B1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100565240B1 (en) | 2004-05-13 | 2006-03-30 | 엘지전자 주식회사 | Heater for clothes dryer |
| EP2013402A2 (en) * | 2006-04-17 | 2009-01-14 | LG Electronics Inc. | Dryer and method of controlling for the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3541303A (en) * | 1967-11-08 | 1970-11-17 | Gen Motors Corp | Lint collecting and burning screen |
| US4825560A (en) * | 1986-12-29 | 1989-05-02 | Hitachi, Ltd. | Electric clothes dryer |
-
1994
- 1994-07-22 FR FR9409100A patent/FR2722869B1/en not_active Expired - Fee Related
-
1995
- 1995-07-13 ES ES95401683T patent/ES2111375T3/en not_active Expired - Lifetime
- 1995-07-13 DE DE69501438T patent/DE69501438T2/en not_active Expired - Fee Related
- 1995-07-13 EP EP95401683A patent/EP0693662B1/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3541303A (en) * | 1967-11-08 | 1970-11-17 | Gen Motors Corp | Lint collecting and burning screen |
| US4825560A (en) * | 1986-12-29 | 1989-05-02 | Hitachi, Ltd. | Electric clothes dryer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100565240B1 (en) | 2004-05-13 | 2006-03-30 | 엘지전자 주식회사 | Heater for clothes dryer |
| EP2013402A2 (en) * | 2006-04-17 | 2009-01-14 | LG Electronics Inc. | Dryer and method of controlling for the same |
| EP2013402A4 (en) * | 2006-04-17 | 2009-12-30 | Lg Electronics Inc | Dryer and method of controlling for the same |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0693662B1 (en) | 1998-01-14 |
| FR2722869B1 (en) | 1996-08-23 |
| FR2722869A1 (en) | 1996-01-26 |
| DE69501438T2 (en) | 1998-04-23 |
| DE69501438D1 (en) | 1998-02-19 |
| ES2111375T3 (en) | 1998-03-01 |
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