WO2005054756A1 - Dispositif chauffant en forme de plaque et piece moulee d'un chauffe-eau instantane et chauffe-eau instantane - Google Patents

Dispositif chauffant en forme de plaque et piece moulee d'un chauffe-eau instantane et chauffe-eau instantane Download PDF

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Publication number
WO2005054756A1
WO2005054756A1 PCT/EP2004/053241 EP2004053241W WO2005054756A1 WO 2005054756 A1 WO2005054756 A1 WO 2005054756A1 EP 2004053241 W EP2004053241 W EP 2004053241W WO 2005054756 A1 WO2005054756 A1 WO 2005054756A1
Authority
WO
WIPO (PCT)
Prior art keywords
heating device
wall
molded part
channel
central region
Prior art date
Application number
PCT/EP2004/053241
Other languages
German (de)
English (en)
Inventor
Martin Stickel
Original Assignee
BSH Bosch und Siemens Hausgeräte GmbH
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 BSH Bosch und Siemens Hausgeräte GmbH filed Critical BSH Bosch und Siemens Hausgeräte GmbH
Priority to PL04804661T priority Critical patent/PL1718906T3/pl
Priority to ES04804661T priority patent/ES2406731T3/es
Priority to EP04804661.9A priority patent/EP1718906B1/fr
Publication of WO2005054756A1 publication Critical patent/WO2005054756A1/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

Definitions

  • the invention relates to a heating device for fluids for installation in a water heater with a heat transfer element, wherein the heat transfer element has a substantially planar central region, on which an electric heating element is arranged, and a channel surrounding the central region, which is for receiving a wall portion of a molded part, to attach the heater to the molded part has.
  • the application further relates to a molded part adapted to the heating device and to a continuous flow heater which has at least the heating device and the molded part.
  • Tubular heaters usually consist of a resistance wire, which is arranged centrally in a stainless steel tube, so that no voltage breakdowns on this are possible.
  • the space between the resistance wire and the stainless steel tube is filled with an insulation-resistant material, usually a magnesium oxide powder.
  • an insulation-resistant material usually a magnesium oxide powder.
  • heaters having an applied on a support plate electrical resistance heater are used, inter alia, in coffee machines or kettles and are subject to only static pressure, ie they are operated virtually without pressure. The requirements for the tightness and the attachment of a heater with a molding are therefore not particularly high.
  • the heating device, and in particular the heat transfer element to which the heating element is applied does not require any special shaping and frequently only flat or simply deformed heat transfer elements are used.
  • a heating vessel for liquids in which an electric heating element is attached to the underside of a metallic vessel base or provided thereon.
  • the vessel base has a heat transfer member having a substantially planar central portion on which the electric heating element is disposed and a channel circumscribing the central portion for receiving a wall portion of a molded part around the heater the advantage to install.
  • the outer channel wall is rolled over a bead provided in the wall portion to clamp the lower end portion of the wall portion therebetween and a seal in the form of a sealing ring.
  • the plate-shaped heating device for a pressure-stable water heater on a channel wall which is formed from a series of axially extending tabs, which are provided for the positive reception of the wall portion of the molded part.
  • the tabs allow the heater with the molding, z. B. to lock, to interlock or secure with a bayonet lock and securely hold in position.
  • the tabs which preferably have recesses in the channel wall, ensure secure attachment of the components, the heating device and the molded part, even if the fluid to be heated is in a fluid space formed between them under pressure and a high temperature.
  • the molding for a fluid flow heater according to the invention for joining with a heating device according to the invention comprises a central portion which is adapted in shape to the central region of the heater, and a central portion surrounding wall portion for insertion into the channel of the heat transfer element of the heater, wherein the Wall section having a series of connecting means which are provided for non-releasable, positive connection in respective tabs of the heat transfer element in the heating device to prevent after assembly, a release of the two components, even under pressure.
  • the molding is preferably made of a Plastic formed.
  • latching hooks are preferably used as connecting means.
  • Latch hooks have the advantage that the assembly can be made particularly simple, since the two components can be joined together by applying a force.
  • the latching hooks spread apart the tabs formed in the channel wall a little until they reach the region of the recess of the tabs, as a result of which the tabs return to their starting position due to the resilient properties of the heat transfer element, in particular in the region of the channel wall.
  • By appropriate design of the latching hook creates a permanent connection. The separation of the heating device and molded part would only be possible in that the channel wall and in particular the channel tabs would be mechanically bent over the outermost end of the latching hook, so that they no longer engage in the recesses of respective tabs and a pulling apart.
  • the recesses of the tabs extend from the channel wall into a section of the channel bottom.
  • a particularly good backup of the connection is provided. Due to the high-temperature fluid, which is under pressure due to the containment of the fluid space, both the molding and the plate-shaped heating device may deform. In particular, the molded part will have such a deformation.
  • a deformation of at least one of the two components has the consequence that the original arrangement of latching hook can change to the respective tabs, so that slipping out of the latching hook would be conceivable from a recess.
  • the protrusion provided in the molding at the end of the wall portion which in the initial state (i.e., without pressurization) projects through the part of the recess located in the channel bottom can effectively prevent such a situation.
  • the projection which bears intimately against the edge of the recess in the channel bottom, counteracts the deformation by a counterforce which holds the latching hook in its position relative to the recess in the tab.
  • the tabs in the channel wall could be formed both in the inner, ie the channel area facing the central area and in the outer channel wall, it is preferred if these are formed in the outer channel wall facing away from the central area. In this variant can be particularly easy way to achieve a good tightness of the heater formed from the heater and the molded part heater.
  • the inner and outer channel wall substantially parallel to each other and are aligned substantially perpendicular to the central region.
  • the heat transfer member has an upwardly extending wall connecting the central region with a raised rim surrounding the plate, the inner channel wall extending downwardly from the edge without passing below the surface of the central region extend.
  • the relative location of the channel edge to the area of the central area with a certain distance, which does not need to be large, allows unhindered access to the central area to provide the heating element, e.g. B. by means of a printing process to apply to this.
  • the edge which, like the channel, can be produced for example by means of embossing, serves to increase the rigidity of the heat transfer element and thus of the heating device. The edge basically prevents uncontrolled, temperature-related distortions or deformations of the heat transfer element.
  • the inner channel wall which extends from the edge down, also forms a sealing surface, which allows a radial seal between the heater and the molding. Due to the installation position of the heater with the edge upwards, this forms a water barrier, which prevents that in case of leakage escaping fluid can reach the heating element. First of all, the fluid would have to overcome the edge, which is curved upward, against gravity. The transition areas between the channel bottom and respective channel walls continue to represent a drip edge, can drain on the escaping water before it reaches the edge. In addition to a mechanical reinforcement of the heater, the edge also causes an increase in the length of the thermal path to the channel into which the wall portion of the molding is inserted.
  • the upwardly extending wall may be turned outwardly away from the central area or substantially perpendicular to the central area. In the first variant, a slightly greater pressure resistance is achieved.
  • the electrical heating element has an electrically insulating substrate with an electrical resistance heating strip applied to the substrate.
  • the heat transfer element is preferably made of a material, in particular stainless steel, which has a low thermal conductivity, in particular in the lateral direction.
  • the connecting means are provided on the side of the wall portion, which is associated with the channel wall with the tabs. This is the outside of the wall portion in accordance with the preferred embodiment of the heater.
  • At least one connecting means engages in a tab of the heating device.
  • the fewer connecting means per tab the larger, i. E. a connecting means should be made wider in order not to let the forces per unit area or length section become too great.
  • the inner wall region of the wall section of the molding directed towards the inner channel wall of the heating device is designed to receive a sealing ring which is arranged radially between the inner channel wall and the wall region, radially after the joining of the molded part with the heating device ,
  • the inner wall region of the wall section must in particular be designed in such a way that the sealing ring is held in position even under deformation of one of the two components.
  • a displacement which could be favored for example by a plastic deformation of the molded part, must be prevented in order to ensure the tightness even in extreme situations.
  • the inner wall region is preferably stepped.
  • the inner wall portion is formed such that it adjoins at least partially to the inner channel wall of the heater after assembly with the heater in the pressure-unloaded state.
  • the molded part has at least one inlet and at least one outlet opening for the fluid, wherein these are arranged in the central region of the molded part.
  • the instantaneous water heater according to the invention has either a heating device as described above or a molded part as described above or both. This has the same advantages as described above in connection with the heater or the molding.
  • the water heater between the molding and the heater has a seal.
  • This is preferably a sealing ring, the has a circular or round cross-section. Sealing rings of the type mentioned can be arranged in a particularly simple manner between these two components when joining the molding and heating device.
  • the cross section allows for some deformation, so that the sealing function is ensured at different, pressure-induced, relative positions of the molding and heating device.
  • FIG. 1 shows a plan view of the outer surface of a heating device according to the invention
  • FIG. 2 shows a section through the heating device from FIG. 1 along the line A-A
  • FIG. 3 shows a side view of the heating device according to the invention, the latter being shown in its subsequent installation position, with the outer surface facing downwards,
  • FIG. 4 shows a detailed view of the edge of the heating device bordered by a dashed line in FIG. 2,
  • FIG. 5 is a perspective view of a continuous heater according to the invention composed of a heating device and a molded part
  • FIG. 6 shows an enlarged sectional view of the outer region of the flow heater, from which the intermeshing of heating device, molded part and sealing ring emerges.
  • FIG. 1 shows a heating device 1 according to the invention in a plan view of its outer surface 14.
  • the heating device 1 has a substantially circular shape.
  • a heat transfer element 3 e.g. made of a stainless steel
  • a heating element 2 is arranged on a central area 4 of a heat transfer element 3, e.g. made of a stainless steel.
  • the heating element 2 consists, for example, of a total of seven circular concentric circular segments, each of which forms a heating section 5.
  • the heating sections 5 are arranged relative to one another in such a way that adjacent ends of the circular segments are electrically connected to one another via a short conductor track 7.
  • the single heating circuit in this case thus extends from one connection end 11 via the outermost concentric ring and each of the further concentric rings to a further connection end 12.
  • the heating element 2 of the present heating device 1 has a single heating circuit.
  • all the heating sections 5 of the heating element 2 are connected in series with one another by corresponding conductor track sections 7.
  • Part of this heating circuit is also a fuse 10, which is located substantially in the center of the central region 4, in which the heating segments 5 the have the lowest radii.
  • FIGS. 2 and 3 show the heating device 1 in its later installation position, e.g. in a dishwasher or a washing machine.
  • the mounting position is defined such that the outer surface 14, on which the heating element 2, the fuse 10, another and later described temperature monitoring element 8 and a contacting device 9 are turned down.
  • the inner surface 13, which comes into contact with the fluid, however, is arranged upward.
  • the fuse 10 is intended to prevent damage to the heating element 2 in the event of a dry running of the heater by melting connection ends 26 of the fuse 10 at contact points 28 which are connected to the conductor 7 of the heating circuit via a solder. Due to the small radii of the heating segments, power concentrations are created in this area which promote the triggering of the fuse. Due to its installation position, the separation of the contact points 28 in the case of melting of the solder can be supported by gravity.
  • the heat transfer member is made of a metal such as a stainless steel, which has a poor thermal conductivity in the lateral direction. Perpendicular thereto, i. in a plane perpendicular to the drawing plane, however, the heat transfer element on the other hand, a good thermal conductivity, so that an effective transfer of the energy generated by the heating element is ensured to the fluid.
  • a temperature monitoring element 8 with a negative temperature coefficient is provided in a mounting area 6.
  • the behavior of the heating element can be deduced by detecting and evaluating the fluid temperature flowing around the inside of the heat transfer element.
  • the use of an NTC resistor as a temperature monitoring device has the advantage that the evaluation of the supplied signal is much easier compared to a PTC resistor.
  • a PTC resistor requires high temperature gradients in order to detect a sufficient change in the resistance.
  • the mounting region 6, which is recessed by the heating element 2 in the central region 3 of the heat transfer element 3, and the contacting device 9 is arranged. With the contacting device 9, the terminal ends 11 and 12 of the heating element 2 via respective conductor tracks 24 and 25 are electrically connected.
  • the contacting device 9 has corresponding contact tongues in its interior, via which it can be mechanically and electrically connected to a correspondingly formed plug. Via the contacting device 9, the heating element 9 is supplied with the necessary voltage and the necessary current.
  • the temperature monitoring device is arranged in the immediate vicinity of the contacting device 9 and electrically connected thereto. This can be contacted via the contacting all provided in the heater electrical loads via a single plug contact.
  • FIG. 1 shows a section along the line A-A of Figure 1, and the side view of Figure 3, the design of the heat transfer device 3 is better understood.
  • the central area 4 is surrounded by a peripheral edge 15.
  • the rim 15 is formed by a wall 17 extending upwardly from the central portion 4 at an angle and a channel wall 18 extending downwardly from the rim 15.
  • the channel wall 18 is part of a channel 16, which further has an outer channel wall 19 and a channel bottom 22.
  • the channel 16, which circumscribes the central region outside the edge 15, serves to receive a wall section of the molded part in order to attach the heating device to the molded part in a manner that is stable in terms of pressure and temperature.
  • the channel wall 19 is formed with a series of tabs 20, which are for receiving latching hooks which are formed in the wall portion of the molding 50 of a flow heater 100 according to the invention ( Figure 5).
  • the channel walls 18 and 19 are arranged substantially parallel to each other and substantially perpendicular to the plane formed by the central region 4.
  • the channel bottom does not extend below the central region 4.
  • the distance d is therefore 0 in the limiting case or, as shown, greater than 0. This makes it possible in a simple manner, on the outer surface 14 of the central region 4, the heating element 2, in particular the heating sections. 5 to apply in a printing process.
  • the geometry of the metal plate may be formed, for example, by a stamping operation in which the tabs 20 are formed and an embossment.
  • the inner channel wall 18 provides a sealing seat, which allows a radial seal between the heater and the molded part. Due to the mounting position of the heater shown in Figures 2 to 4, with the outer surface 14 down, the edge in conjunction with the channel 16 also forms a water barrier, which prevents in the event of leakage of the water heater, the exiting fluid to the heating element can run.
  • the channel bottom 23 thus represents a drip edge, can drain on the exiting fluid before it can reach the serving as a water barrier edge 15.
  • the tabs formed in the outer channel wall 19 each have a recess 21 which extends from the outer channel wall 19 in the direction of the channel bottom 22. This design ensures that a secure locking of the heating device 1 can be done with the molding 50.
  • FIG. 5 shows, in a perspective view, the instantaneous water heater 100 according to the invention, which shows the heating device 1 with a molded part 50 connected thereto.
  • the molded part 50 which consists for example of a plastic, has an inlet opening 51, which is oriented radially. Furthermore, two outlet openings 52 extending axially are provided. Each of the outlet openings 52 can be connected to a separate spray device of a dishwasher. Of course, the arrangement of the inlet opening and the outlet openings can also take place at locations other than those shown in the figure.
  • the latching between the heating device 1 and the molded part 50 can be seen.
  • the latching takes place via the already mentioned tabs 20, engage in the latching hooks 53, and prevent the release of the molded part 50 of the heating device 1 under pressure.
  • a sealing ring is arranged between the molding 50 and the heater 1, a sealing ring is arranged. More specifically, the sealing ring is disposed between a wall of the molded part extending in the channel 16 and the inner channel wall 18, whereby also under pressure, i. under a possible deformation, in particular of the molding, but also the heater, a high density is ensured.
  • FIG. 6 which shows an enlarged sectional view of the outside portion of the flow heater 100, the intermeshing of the heater 1, the molding 50, and a seal ring 57 will become more apparent.
  • the inner wall portion 58 is stepped to receive a seal 57 between the inner duct wall 18 and the inner wall portion.
  • the seal 57 is formed as a sealing ring and in the initial state o-shaped.
  • the seal lies in the reference numeral 58th provided level of the inner wall area.
  • a further step is formed, which allows the wall 55 to be adjacent to the inner channel wall 18 and the edge 15.
  • the outer wall region has latching hooks 53, of which only one can be seen in cross-section.
  • the catch hook 53 protrudes through the recess 21 of a tab 20.
  • the recess 21 extends from the outer channel wall 19 down into a portion of the channel bottom 22. Through this region of the recess 21 protrudes a projection 56 which is arranged at the outer end of the wall portion 55.
  • the projection 50 adjoins in the unloaded state to an edge 23 of the recess.
  • a reinforcement 59 circulates the central region 54 in a circular manner and serves only for mechanical reinforcement. Depending on the pressures for which the water heater must be designed, the gain 59 could be performed radially wider. If necessary, if only slight pressures occur, it would also be dispensable.
  • the design of the inner wall area in conjunction with the sealing ring ensures reliable sealing of the flow heater 100, even in the case of a possible deformation of the molded part 50 and / or heating device 1. This is essentially based on the fact that the inner channel wall 18 a sealing seat forms for a radial seal.
  • the fluid space formed in the interior between the heating device and the molded part has no flow resistance, as is the case, for example, with tubular heating elements located in the interior of a fluid space.
  • the pump power can be reduced in a water heater according to the invention, since less flow losses are compensated. With a smaller pump costs can be saved.
  • higher pressures can be achieved while maintaining the previously used pumps, so that the mechanical loading of a wash ware is increased.
  • the instantaneous water heater according to the invention has a very low number of parts and can be produced in a particularly simple manner.
  • the necessary measures for producing a secure seal measures are much lower, since only a single sealing ring between the Schuvo ⁇ ichtung and the molded part must be provided.

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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)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)

Abstract

L'invention concerne un dispositif chauffant (1) en forme de plaque, une pièce moulée (50) destinée à un chauffe-eau instantané et un chauffe-eau instantané (100) de pression et de température stables. Le dispositif chauffant (1) en forme de plaque destiné à un chauffe-eau instantané (100) pour fluides comprend un élément de transfert thermique (3). Cet élément de transfert thermique présente une zone centrale (4) sensiblement plane sur laquelle est placé un élément chauffant électrique (2) et un canal (16) qui entoure la zone centrale (4) et permet de loger une section de paroi (55) d'un élément moulé (50) afin de monter le dispositif chauffant (1) sur l'élément moulé (50). Une autre paroi de canal (19) formée d'une série de pattes (20) d'extension axiale qui sont destinées à agripper des moyens de liaison prévus dans la section paroi (55) de la pièce moulée (50).
PCT/EP2004/053241 2003-12-04 2004-12-02 Dispositif chauffant en forme de plaque et piece moulee d'un chauffe-eau instantane et chauffe-eau instantane WO2005054756A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PL04804661T PL1718906T3 (pl) 2003-12-04 2004-12-02 Podgrzewacz przepływowy
ES04804661T ES2406731T3 (es) 2003-12-04 2004-12-02 Calentador de flujo continuo
EP04804661.9A EP1718906B1 (fr) 2003-12-04 2004-12-02 Chauffe-eau écoulement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10356789.5 2003-12-04
DE10356789A DE10356789A1 (de) 2003-12-04 2003-12-04 Plattenförmige Heizvorrichtung und Formteil für einen Durchlauferhitzer und Durchlauferhitzer

Publications (1)

Publication Number Publication Date
WO2005054756A1 true WO2005054756A1 (fr) 2005-06-16

Family

ID=34638359

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/053241 WO2005054756A1 (fr) 2003-12-04 2004-12-02 Dispositif chauffant en forme de plaque et piece moulee d'un chauffe-eau instantane et chauffe-eau instantane

Country Status (5)

Country Link
EP (1) EP1718906B1 (fr)
DE (1) DE10356789A1 (fr)
ES (1) ES2406731T3 (fr)
PL (1) PL1718906T3 (fr)
WO (1) WO2005054756A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102987910A (zh) * 2012-10-25 2013-03-27 宁波好伙伴电器有限公司 电热水壶
CN103948312A (zh) * 2014-05-04 2014-07-30 宁波好伙伴电器有限公司 一种电热水壶及其制备方法
CN104957978A (zh) * 2015-07-20 2015-10-07 周林斌 一种加热防爆水壶的装配方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2602524A1 (fr) * 1986-08-08 1988-02-12 Bosch Siemens Hausgeraete Dispositif de chauffage instantane pour le liquide de lavage et de rincage d'un lave-vaisselle ou d'un lave-linge
EP0485211A1 (fr) * 1990-11-09 1992-05-13 Pifco Limited Appareil de chauffage
US5914063A (en) * 1994-12-13 1999-06-22 Strix Limited Liquid heating vessels
DE29918863U1 (de) * 1999-10-27 2001-04-05 Forbach Gmbh Kunststoff-Kanalkörper für einen elektrisch beheizten Durchlauferhitzer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2602524A1 (fr) * 1986-08-08 1988-02-12 Bosch Siemens Hausgeraete Dispositif de chauffage instantane pour le liquide de lavage et de rincage d'un lave-vaisselle ou d'un lave-linge
EP0485211A1 (fr) * 1990-11-09 1992-05-13 Pifco Limited Appareil de chauffage
US5914063A (en) * 1994-12-13 1999-06-22 Strix Limited Liquid heating vessels
DE69520563T2 (de) 1994-12-13 2001-11-22 Strix Ltd Gefässe zum erhitzen von flüssigkeiten
DE29918863U1 (de) * 1999-10-27 2001-04-05 Forbach Gmbh Kunststoff-Kanalkörper für einen elektrisch beheizten Durchlauferhitzer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102987910A (zh) * 2012-10-25 2013-03-27 宁波好伙伴电器有限公司 电热水壶
CN103948312A (zh) * 2014-05-04 2014-07-30 宁波好伙伴电器有限公司 一种电热水壶及其制备方法
CN104957978A (zh) * 2015-07-20 2015-10-07 周林斌 一种加热防爆水壶的装配方法
CN104957978B (zh) * 2015-07-20 2017-03-29 周林斌 一种加热防爆水壶的装配方法

Also Published As

Publication number Publication date
DE10356789A1 (de) 2005-07-07
EP1718906B1 (fr) 2013-04-24
EP1718906A1 (fr) 2006-11-08
PL1718906T3 (pl) 2013-09-30
ES2406731T3 (es) 2013-06-07

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