DE102018207112A1 - Heating device for heating a fluid - Google Patents

Abstract

The invention relates to a heating device for heating a fluid (12a), in particular water, with at least one fluid guide unit (14a; 14b) for specifying a flow direction (16a, 16b) of the fluid (12) and with at least one fluid guide unit (14a 14b), in particular a heating coil unit, for heat transfer to the fluid (12a).
It is proposed that the heating device comprise at least one heat-insulating unit (20a, 20b) arranged in sections between the fluid-guiding unit (14a, 14b) and the heating unit (18a, 18b).

Description

State of the art

There has already been proposed a heating device for heating a fluid, in particular water, with at least one fluid guide unit for specifying a flow direction of the fluid and with at least one heating unit arranged in the fluid guide unit, in particular a heating coil unit, for heat transfer to the fluid.

Disclosure of the invention

The invention relates to a heating device for heating a fluid, in particular water, with at least one fluid guide unit for specifying a flow direction of the fluid and with at least one arranged in the fluid guide unit heating unit, in particular a Heizwendeleinheit, for heat transfer to the fluid.

It is proposed that the heating device comprises at least one heat-insulating unit arranged in sections between the fluid-guiding unit and the heating unit. Preferably, the heating device is provided to heat the fluid under the supply of electrical energy. The fluid is preferably water, in particular process water and / or drinking water. It is also conceivable that the fluid is air and / or a heat transfer medium for a closed heating and / or cooling circuit, for example a hydrocarbon, ammonia, a thermal oil or the like. Preferably, the heating device comprises at least one inlet channel to an inlet of the fluid to be heated in the heating device. Preferably, the heater comprises at least one exit channel to an outlet of the heated fluid from the heater. Preferably, the input channel is arranged on the fluid guide unit, in particular formed integrally with the fluid guide unit. Preferably, the output channel is arranged on the fluid guide unit, in particular formed integrally with the fluid guide unit. Preferably, the output channel is fluidly connected to the input channel, in particular within the heater, via the fluid guide unit.

Preferably, the fluid guiding unit comprises at least one pipe section, a channel section, a shaft section, a hose section and / or another fluid guide section which appears expedient to the person skilled in the art for specifying a flow direction of the fluid, in particular from the inlet channel to the outlet channel. Preferably, the fluid guide unit comprises at least one heating channel. A "heating channel" should in particular be understood to mean a fluid-guiding section in which the heating unit is arranged. Preferably, the fluid guide unit comprises at least one floor mounting element, in particular a bottom half, and at least one ceiling mounting element, in particular a ceiling half, for forming a fluid guide section. Preferably, at least two base mounting elements, which are provided to form different fluid guide sections, materially connected, in particular in one piece with each other. Preferably, at least two ceiling mounting elements, which are provided to form different fluid guide sections, materially connected, in particular in one piece with each other. By "one-piece" should be understood in particular formed in one piece. Preferably, this is a piece of a single blank, a mass and / or a casting, more preferably in an injection molding process, in particular a one- and / or multi-component injection molding process prepared. In particular, the fluid guide unit comprises at least two mounting half shells for forming at least a majority of the fluid guide sections. It is also conceivable that two fluid guide sections are connected to each other via a flange, screw, plug and / or clamp connection. It is conceivable that the heating device comprises fluid flow regulating elements arranged on the fluid guiding unit, for example a check valve, a regulating valve, a propeller unit or the like.

Preferably, the heating unit is designed as a resistance heater. In particular, the heating unit is intended to increase its temperature by applying an electric current. Preferably, the heating unit has at least two connection elements to a supply of electric current from a, in particular external, power source. The heating unit preferably has a current conductor unit between the connection elements, in particular with a positive resistance coefficient. Preferably, the conductor unit comprises a heating coil. It is also conceivable that the current conductor unit has an at least substantially straight heating wire, a heating coil, a heating grid, a heating coil and / or a heating wire with another form that appears expedient to the person skilled in the art. The heating coil preferably has at least one winding element, preferably more than ten winding elements, particularly preferably more than 50 winding elements. Preferably, the heating coil, in particular completely, within the fluid guide unit, in particular within at least the heating channel, arranged. Preferably, a longitudinal axis of the heating unit, in particular the heating coil, at least substantially parallel to a longitudinal axis of the heating channel. Preferably The connecting elements protrude partially into the fluid guiding unit, in particular into the at least one heating channel.

The thermal insulation unit is provided to at least partially suppress and / or insulate a heat transfer from the heating unit to the fluid guiding unit. In particular, the heat insulation unit is provided to keep a temperature of the fluid guide unit, in particular of the heating channel, preferably an inner wall of the heating channel, below a threshold value during operation of the heating device, in particular the heating unit. The threshold value is preferably dependent on a material of the fluid guiding unit. Preferably, the threshold value is at least smaller than a melting temperature of the fluid guiding unit. Preferably, the threshold value is determined by at least one further temperature-dependent limit value of the fluid guiding unit, which in particular results in damage to the fluid guiding unit and / or a change in the chemical composition of the fluid flowing through the fluid guiding unit. For example, the further temperature-dependent parameter of the fluid guiding unit is a yield point, a standardized dimensional stability, a chemical resistance, an outgassing behavior or the like. Preferably, the thermal insulation unit comprises at least one spacer element, to avoid direct contact of the heating unit with the fluid guide unit, in particular with the inner wall of the heating channel. Preferably, the heat insulation unit comprises at least one heat insulation element, in particular with a main volume fraction of the heat insulation unit, which in particular has a maximum heat conductivity which is at least smaller than a minimum thermal conductivity of the fluid. It is conceivable that at least one heat insulation element of the heat insulation unit has at least one gas inclusion, in particular an air pocket, in particular for a reduction of an effective heat conductivity of the heat insulation unit compared to a solid embodiment. It is also conceivable that the thermal insulation unit has at least one reflection element, for example a metal foil, for a reflection of heat radiation. Preferably, the heat insulation unit in the fluid guide unit, in particular in the heating channel, arranged, in particular fixed. It is also conceivable that the heat insulation unit is attached to the heating unit and in particular is arranged together with the heating unit in the fluid guide unit. Preferably, the heat insulation unit is completely disposed within the fluid guide unit, in particular in the heating channel. Preferably, the heat insulation unit between the heating unit, in particular the conductor unit, and the fluid guide unit, in particular the inner wall of the heating channel is arranged. Preferably, the heat-insulating unit is arranged at a distance from the heating unit, in particular the conductor unit. Preferably, at least one surface, in particular in a mounted between the heating unit and the fluid guide unit state of the heat insulation unit of a heating unit surface facing the heat insulation unit grooves, ridges, knobs, pins o. The like., In particular to a small-area, in particular punctual, contact Heat insulation unit with the heating unit and / or the fluid guide unit, in particular during a movement of the heating unit relative to the fluid guide unit. A "small-area contact" of an object with a further object should be understood in particular to mean that an entire contact surface of the object with the further object is less than 50%, preferably less than 25%, particularly preferably less than 10% of a total facing the further object Surface of the object includes.

"Substantially parallel" is to be understood here as meaning, in particular, an alignment of a direction relative to a reference direction, in particular in a plane, wherein the direction relative to the reference direction is a deviation, in particular less than 8 °, advantageously less than 5 ° and particularly advantageously less than 2 °. By "intended" is intended to be understood in particular specially designed and / or equipped. The fact that an object is intended for a specific function should in particular mean that the object fulfills and / or executes this specific function in at least one application and / or operating state.

Due to the inventive design of the heater, an advantageously reliable temperature resistance of the heater can be achieved. In particular, the inner wall of the fluid guiding unit can advantageously be protected from a temperature influence above the threshold value. In particular, materials, in particular having a low temperature resistance, which are advantageously inexpensive and / or allow an advantageously flexible shaping, can be used for the fluid guiding unit.

It is further proposed that the heat insulation unit envelop the heating unit at least partially, in particular rotationally symmetrically, in at least one plane. Preferably, the thermal insulation unit at least partially surrounds the heating unit in a plane at least substantially perpendicular to the longitudinal axis of the heating unit and / or the heating channel. Preferably, the heat insulation unit is arranged rotationally symmetrically in the heating channel with respect to the longitudinal axis of the heating channel. Preferably, the surrounds Heat insulation unit, the heating unit, in particular the conductor unit, with respect to the longitudinal axis of the heating unit rotationally symmetrical. For example, the thermal insulation unit has at least one heat insulation element of the heat insulation unit, which is designed as a hose element and / or as a pipe element and which surrounds the heating unit. By way of example, the heat insulation unit comprises at least two heat insulation elements formed separately from one another, in particular at least substantially rotationally symmetrical and in particular spaced apart and / or at least partially touching or overlapping, in the heating channel and / or around the heating unit. The heat insulation unit preferably has at least one heat insulation element for each mounting half shell of the fluid guidance unit. It is also conceivable that the thermal insulation unit is arranged asymmetrically in the fluid guide unit and / or envelops the heating unit asymmetrically. The term "substantially perpendicular" is intended here to define, in particular, an orientation of a direction relative to a reference direction, the direction and the reference direction, in particular in one plane, including an angle of 90 ° and the angle a maximum deviation of, in particular, less than 8 °, advantageously less than 5 ° and particularly advantageously less than 2 °. By virtue of the configuration according to the invention, the heating unit can advantageously be held in a position spaced from the inner wall of the heating channel by the heat insulation unit along the longitudinal axis of the heating channel. In particular, a heat transfer from the heating unit to the fluid guiding unit can advantageously be avoided by direct contact of the heating unit with the fluid guiding unit.

It is also proposed that the heat insulation unit is arranged along a longitudinal axis of a heating channel of the fluid guiding unit over an at least substantially entire maximum extent of the heating channel in the heating channel. A "substantially entire extension" is to be understood in particular as meaning a coherent partial section and / or a plurality of spaced-apart partial sections of the extension which comprise more than 50%, preferably more than 75%, particularly preferably more than 90%, of the extension / includes. Preferably, the heat insulation unit is arranged over an at least substantially entire maximum extent of the conductor unit, in particular the heating coil, along the longitudinal axis of the heating unit in the heating channel. Preferably, the heat insulation unit is arranged over an at least substantially entire maximum extent of the heating unit, in particular following a course of the heating channel, from connection element to connection element on the heating unit. The heat insulation unit is preferably arranged along the longitudinal axis of the heating channel of the fluid guiding unit over the at least substantially entire maximum extent of the heating channel on the inner wall of the heating channel. Preferably, the heat insulation unit at least substantially completely covers the heating channel. It is conceivable that the thermal insulation unit has at least one recess, for example for arranging a sensor unit, in particular a temperature sensor, within the heating channel. It is conceivable for the heat insulation unit to comprise at least one spacer element in order to keep, in a state of the heat insulation unit arranged in the heating channel, a surface of a main volume portion of the heat insulation unit facing the inner wall spaced from the fluid guidance unit. The embodiment according to the invention advantageously makes it possible to avoid heat transfer from the heating unit to the fluid guiding unit via direct contact of the heating unit with the fluid guiding unit via the at least substantially entire maximum extent of the heating unit and / or heating channel.

Furthermore, it is proposed that the heat insulation unit is integrally formed with the fluid guide unit. Preferably, the heat insulation unit is formed integrally with the fluid guide unit. Preferably, at least one heat insulating element of the thermal insulation unit is integrally formed with one of the mounting half shells of the fluid guide unit. In particular, at least one of the mounting half-shells of the fluid-guiding unit and at least one heat-insulating element of the heat-insulating unit is designed as a multi-component injection-molded part, in particular as a 2K part and / or as an overmolding part. It is also conceivable that the heat insulation unit and / or the fluid guide unit have at least one connecting element, which is provided in particular for a downstream production of a cohesive connection of the fluid guide unit with the heat insulation unit. For example, the connecting element is designed as a welding surface, as an adhesive surface and / or as a soldering surface. The embodiment according to the invention makes it advantageously possible to achieve an at least substantially complete lining of the heating channel with the heat insulation unit. In particular, a contact of the heating unit, in particular the conductor unit, can be advantageously avoided with the inner wall of the heating channel.

Furthermore, it is proposed that the heat insulation unit is designed as an insert. Preferably, the heat insulation unit is arranged with positive and / or non-positive engagement with the fluid guide unit. Preferably, the Heat insulation unit at least one heat insulating element, which is at least partially complementary to the inner wall of the fluid guide unit, in particular the heating channel is formed. For example, at least one heat insulating element of the thermal insulation unit is designed as a tubular element and / or as a tubular element, which receives in particular the heating unit. For example, at least one thermal insulation element of the thermal insulation unit is designed as a planar base element, in particular to an at least partial lining of the heating channel. For example, the thermal insulation unit comprises at least one band-shaped heat insulating element which is arranged in particular straight, spiral, serpentine and / or patternless on the inner wall of the heating channel following the longitudinal axis of the heating channel. The inventive design, the heat insulation unit can be advantageously designed flexible. In particular, a shape of the heat insulation unit can advantageously be easily adapted to differently configured heating devices, in particular heating channels.

In addition, it is proposed that the heating device comprises a fixing unit for fixing the heat insulation unit formed as an insert part. Preferably, the fixing unit is arranged in the fluid guide unit, in particular in the heating channel. In particular, the fixing unit is formed integrally with the fluid guiding unit. Preferably, the fixing unit is provided as a positioning aid in a mounting of the heat insulation unit in the fluid guide unit. Preferably, the fixing unit fixes the thermal insulation unit within the heating channel. By way of example, the fixing unit comprises a structural element designed as a pin, as a cone, as a hook and / or as another extension, which projects in particular into the heating channel from the inner wall of the heating channel and which, in particular, in a fixed state of the thermal insulation unit in the heating channel into a corresponding opening the heat insulation unit, in particular of the tubular element, the tubular element and / or the flat base element engages. It is also conceivable that the thermal insulation unit has at least one extension which engages in a recess of the heating channel. For example, the fixing unit comprises a fixing element designed as a groove in the inner wall of the heating channel, in particular for receiving the band-shaped heat insulation element. It is also conceivable that the fixing unit has a fixing element designed as a friction layer, which is applied in particular to the inner wall of the heating channel. It is also conceivable that the thermal insulation unit is fixed by means of screws and / or clamps in the fluid guide unit. As a result of the configuration according to the invention, the heat insulation unit can advantageously be arranged simply in the fluid guidance unit. In particular, an advantageously reliable positioning of the thermal insulation unit in the heating channel can be achieved. In particular, slipping of the heat insulation unit, in particular during operation and / or during transport of the heating device, can advantageously be avoided.

It is further proposed that the thermal insulation unit consists at least essentially of at least one engineering plastic, in particular a polyphthalamide (PPA). The term "an object consisting essentially of a substance" should in particular be understood to mean that at least a volume fraction and / or a mass fraction of the substance in a total volume and / or a total mass of the object is at least greater than 33%, preferably greater than 68 %, more preferably greater than 99%. Preferably, at least one heat-insulating element of the heat-insulating unit consists at least essentially of the technical plastic, in particular of a technical thermoplastic. For example, at least one heat-insulating element of the heat-insulating unit consists at least substantially of polyoxymethylene, polyamide or polycarbonate, particularly preferably of PPA. The embodiment according to the invention makes it possible to provide an advantageously temperature-resistant thermal insulation unit.

Furthermore, it is proposed that a region of the fluid guiding unit which is at least partially protected by the heat insulation unit consists at least partially of at least one standard plastic, in particular polypropylene (PP). Preferably, the fluid guide unit consists at least substantially of the standard plastic. For example, the fluid guiding unit consists at least substantially of polyethylene and / or polyvinyl chloride, preferably of PP, more preferably of glass fiber reinforced PP. Preferably, a protected by the heat insulating unit portion of the fluid guide unit of the heating unit, in particular the heating coil, from at least partially covered by the heat insulation unit. Preferably, at least one mounting half-shell consists at least substantially of the standard plastic, in particular polypropylene. The embodiment according to the invention makes it possible to provide an advantageously cost-effective fluid-guiding unit, in particular an advantageously cost-effective heating apparatus.

It is proposed a water heater, in particular a bare-wire water heater, with a heater according to the invention. There will be a water heater, especially bare-wire water heater, with a proposed heater according to the invention. Preferably, the water heater comprises a housing, in particular for a protection of the heater and / or a user. Preferably, the instantaneous water heater comprises at least one, in particular fluidly connected to the input channel, fluid inlet channel, for introducing a fluid to be heated. Preferably, the water heater comprises at least one fluid outlet channel fluidly connected to the output channel for discharging the heated fluid. Preferably, the heating device is fluidly arranged between the fluid inlet channel and the fluid outlet channel. Preferably, the flow heater comprises a fluid regulation unit on the fluid inlet channel, for adjusting a volume flow as a function of a, in particular externally generated, pressure difference between the fluid inlet channel and the fluid outlet channel. It is also conceivable that the instantaneous heater comprises a fluid delivery unit, for example a pump and / or a compressor, for conveying the fluid through the instantaneous heater, in particular the heating device. Preferably, the water heater has at least one power supply unit. Preferably, the power supply unit comprises at least one power connection to a supply of the water heater with power from an external source, in particular a public power grid. It is also conceivable that the power supply unit comprises an internal power generation and / or storage unit, for example a battery unit, an accumulator unit and / or a power generator. Preferably, the water heater has at least one user interface for operating the water heater, in particular by a user. For example, the user interface is intended to set a fluid quantity and / or a fluid temperature. Preferably, the instantaneous water heater comprises a sensor device for measuring at least one fluid and / or operating parameter, for example a fluid temperature, a volumetric flow, an inlet pressure of the fluid, an energy consumption, an electric current or the like. Preferably, the instantaneous water heater comprises a control unit, to a control or regulation of a fluid and / or operating parameter. A "control and / or regulating unit" should in particular be understood to mean a unit having at least one control electronics. By "control electronics" is meant in particular a unit with a processor unit and with a memory unit and with an operating program stored in the memory unit. Preferably, the water heater comprises a differential pressure switch, to control an amount of heat supplied via the heater in dependence on a volume flow. The embodiment according to the invention makes it possible to provide an advantageously cost-effective and / or advantageously temperature-resistant instantaneous water heater.

In addition, the invention proceeds from a method for assembling a heating device, in particular a heating device according to the invention, which comprises at least one fluid guiding unit for specifying a flow direction of a fluid and at least one heating unit arranged in the fluid guiding unit, in particular a heating coil unit, for heat transfer to the fluid , It is proposed that in at least one method step, a heat insulation unit for the heating unit is arranged on the fluid guide unit. During a production of the fluid guiding unit, in particular the mounting half-shells, the heat-insulating unit is preferably arranged on the fluid-guiding unit in at least one method step, in particular connected in a material-locking manner to the fluid-guiding unit. Preferably, the thermal insulation unit is arranged on the fluid guide unit, in particular in the heating channel, by means of a multi-component injection molding process. Alternatively, the heat insulation unit is arranged, in particular fixed, in the fluid guidance unit, in particular in the heating channel, during a heat insulation installation following the production. Preferably, during the thermal insulation assembly, the thermal insulation unit is placed in at least one process step in the heating channel, pressed and / or inserted. Preferably, during the thermal insulation assembly, the thermal insulation unit, in particular at least one heat insulating element, fixed to the fluid guide unit, in particular in at least one mounting half-shell, via the at least one connecting element cohesively and / or force-locking and / or positive locking via the fixing unit. Preferably, during a heating unit assembly in at least one method step, the heating unit is arranged in the fluid guiding unit. Preferably, in at least one method step, the heating unit is arranged along a longitudinal axis of the heating channel. In particular, in at least one method step, the heating unit is arranged in a mounting half-shell of the fluid-guiding unit. Preferably, in at least one method step, the heating unit is arranged on the heat insulation unit, in particular on at least one heat insulation element. Alternatively, the heat-insulating unit, in particular the tubular heat-insulating element, is fastened to the heating unit and arranged together with it in the fluid-guiding unit. Preferably, during a fluid guide unit closure in at least one method step, the mounting half shells are materially connected to one another, in particular welded. It is also conceivable that the mounting shells by a Pressing process and / or screwing be connected. Preferably, the heat insulation unit and the heating unit, in particular the heating coil, during the fluid guide unit closure within the heating channel, in particular no play, clamped. The inventive design of the method, an advantageous low-noise heater can be mounted. In particular, an assembly of the low-noise heating device can advantageously be designed simply.

The heating device according to the invention, the instantaneous water heater according to the invention and / or the method according to the invention should / should not be limited to the application and embodiment described above. In particular, the heating device according to the invention, the instantaneous water heater according to the invention and / or the method according to the invention can have a different number of individual elements, components and units as well as method steps in order to fulfill a mode of operation described herein. In addition, in the value ranges indicated in this disclosure, values lying within the stated limits are also to be disclosed as disclosed and used as desired.

list of figures

Further advantages emerge from the following description of the drawing. In the drawings, two embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

• 1 eine schematische Darstellung eines erfindungsgemäßen Durchlauferhitzers,
• 2 eine schematische Darstellung einer erfindungsgemäßen Heizvorrichtung in einem vormontierten Zustand,
• 3 eine schematische Darstellung eines Querschnitts einer Fluidführungseinheit der erfindungsgemäßen Heizvorrichtung,
• 4 ein Flussdiagramm eines erfindungsgemäßen Verfahrens und
• 5 eine schematische Darstellung eines Querschnitts einer Fluidführungseinheit einer alternativen erfindungsgemäßen Heizvorrichtung.

Show it:

• 1 a schematic representation of a flow heater according to the invention,
• 2 a schematic representation of a heating device according to the invention in a preassembled state,
• 3 a schematic representation of a cross section of a fluid guide unit of the heating device according to the invention,
• 4 a flow chart of a method according to the invention and
• 5 a schematic representation of a cross section of a fluid guide unit of an alternative heating device according to the invention.

Description of the embodiments

1 shows a water heater 28a , in particular a bare-wire water heater, with a heating device 10a , The heater 10a is for heating a fluid 12a , in particular water provided. The heater 10a includes at least one fluid guide unit 14a for specifying a flow direction 16a of the fluid 12a , Preferably, the water heater comprises 28a a housing 32a , in particular for protection of the heating device 10a and / or a user. Preferably, the water heater comprises 28a at least one fluid inlet channel 34a , to let in a portion to be heated 36a of the fluid 12a , Preferably, the water heater comprises 28a at least one fluid outlet channel 38a , to skipping a heated portion 40a of the fluid 12a , Preferably, the heating device 10a fluidically between the fluid inlet channel 34a and the fluid outlet channel 38a arranged. Preferably, the water heater comprises 28a a fluid regulation unit 42a , in particular a control valve, on the fluid inlet channel 34a , to an adjustment of a volume flow as a function of a, in particular externally generated, pressure difference between the fluid inlet channel 34a and the fluid outlet channel 38a , The heater 10a includes at least one heating unit 18a , in particular a heating coil unit, for a heat transfer to the fluid 12a , The heater 10a comprises at least a sectionally between the fluid guide unit 14a and the heating unit 18a arranged heat insulation unit 20a (please refer 3 ). Preferably, the water heater 28a at least one power supply unit 44a on. Preferably, the power supply unit comprises 44a , at least one power connection to a supply of the water heater 28a with electricity from an external source, in particular a public power grid. Preferably, the water heater 28a at least one user interface 46a to an operation of the water heater 28a especially by a user. For example, the user interface 46a intended to set a fluid quantity and / or a fluid temperature. Preferably, the water heater comprises 28a a sensor device 48a for a measurement of at least one fluid and / or operating parameter, for example a fluid temperature, a volume flow, an inlet pressure of the fluid 12 , a power consumption, an electric current, or the like. Preferably, the instantaneous water heater comprises 28a a control unit 50a , to a control or regulation of a fluid and / or operating parameter. Preferably, the water heater comprises 28a a differential pressure switch 52a to control one over the heater 10a supplied amount of heat as a function of a volume flow of the fluid 12a , Preferably, between the fluid inlet channel 34a and the heater 10a at least one check valve 54a arranged.

2 shows the heater 10a , in particular a mounting half-shell 56a the fluid guide unit 14a , in a preassembled condition. Preferably, the heating unit comprises 18a at least one heating coil 58a , Preferably, the heating unit comprises 18a at least one more heating coil 60a . 62a , Preferably, the heating unit 18a in the heating channel 24a and / or at least one further heating channel 64a . 66a the fluid guide unit 14a arranged. In particular, at least the heating coil 58a , in particular completely, in the heating channel 24a arranged. Preferably, the heating channel 24a and / or the other heating channels 64a . 66a at least substantially U-shaped, in particular with two legs at least substantially parallel and at least one bend connecting the legs 67a , educated. Preferably, the heating coil 58a in the heating channel 64a arranged at least substantially U-shaped. Preferably, the heating unit 18a , in particular the heating coil 58a , and the heating channel 24a in one in the heating channel 24a mounted state of the heating unit 18a at least the common longitudinal axis 22a in particular at least substantially parallel to one of the legs of the heating channel 24a runs. Preferably, the heating channel 24a and at least one of the further heating channels 64a . 66a , In particular, the respective associated legs, at least substantially arranged parallel to each other. Preferably, the heating unit 18a at least two electrical connection elements 68a . 70a on, over which the heating unit 18a , in particular the heating coil 58a in the heating channel 24a in at least two places, in particular at one of the bends 67a opposite end of the heating channel 24a , is fixed. Preferably, the at least one further heating coil 60a . 62a analogous to the heating coil 58a formed and in particular analog in the at least one further heating channel 64a . 66a arranged.

3 shows a cross section of the fluid guide unit 14a , in particular the U-shaped heating channel 24a , Preferably, the fluid guide unit comprises 14a the mounting half-shell 56a , Preferably, the fluid guide unit comprises 14a one with the mounting half-shell 56a combinable further mounting half-shell 72a , in particular for the formation of the heating channel 24a , The heat insulation unit 20a is designed as, in particular tubular, insert. Preferably, the heat insulation unit 20a , in particular at least one heat-insulating element 74a . 76a . 78a . 80a the heat insulation unit 20a in the heating channel 24a arranged. In particular, the thermal insulation unit 20a , in particular the thermal insulation element 74a . 76a . 78a . 80a between the heating unit 18a , in particular the heating coil 58a , and the fluid guide unit 14a , in particular an inner wall 82a of the heating channel 24a arranged. A through the heat insulation unit 20a at least partially protected area of the fluid guide unit 14a consists at least partially of at least one standard plastic, in particular polypropylene (PP). Preferably, the mounting half-shell exists 56a and / or the further mounting half-shell 72a at least essentially of the standard plastic, in particular PP. The heat insulation unit 20a envelops the heating unit 18a in at least one plane, in particular in one to the longitudinal axis 22a substantially vertical plane, at least partially, in particular rotationally symmetrical. In particular, the thermal insulation element envelops 74a . 76a . 78a . 80a the heating unit 18a , in particular the heating coil 58a , in at least one plane at least partially, in particular rotationally symmetrical. In particular, the thermal insulation unit closes 20a the heating unit 18a , in particular the heating coil 58a , in at least one level at least substantially completely. Preferably, the heat insulation unit 20a , in particular for a simple assembly, at least in two parts. Preferably, at least two heat insulation elements complement each other 74a . 76a . 78a . 80a to an at least substantially complete enclosure of the heating unit 18a , in particular the heating coil 58a , in at least one level. It is also conceivable that the heat insulation unit 20a at least one further heat insulating element, in particular a tubular element, comprising, as a single component, the heating unit 18a , in particular the heating coil 58a wrapped in at least one level at least substantially complete. Preferably, the thermal insulation element envelops 74a . 76a . 78a . 80a the heating unit 18a , in particular the heating coil 58a in at least one of the legs of the U-shaped heating channel 24a in at least one level. Preferably, the heat insulation unit 20a , in particular the thermal insulation element 74a . 76a . 78a . 80a spaced from the heating unit 18a , in particular the heating coil 58a arranged. The heat insulation unit 20a is along the longitudinal axis 22a of the heating channel 24a the fluid guide unit 14a over an at least substantially entire maximum extent of the heating channel 24a in the heating channel 24a arranged (see 2 ). The heater 10a has a fixing unit 26a to a fixation of the formed as an insert heat insulation unit 20a on. Preferably, the fixing unit 26a in the fluid guide unit 14a , in particular in the heating channel 24a arranged. In particular, the fixing unit 26a in one piece with the fluid guide unit 14a educated. Preferably, the fixing unit comprises 26a at least one fixing element 84a . 86a , in particular a pin element, in particular of the inner wall 82a of the heating channel 24a starting in the heating channel 24a protrudes. Preferably, the fixing element engages 84a . 86a in one within the heating channel 24a fixed state of the heat insulation unit 20a in a corresponding opening of the thermal insulation unit 20a into it. The heat insulation unit 20a consists at least essentially of at least one engineering plastic, in particular a polyphthalamide (PPA). In particular, the thermal insulation unit covers 20a in one in the fluid guide unit 14a arranged state at least partially the heating channel 24a , in particular to a shield of the fluid guide unit 14a before a temperature effect by the heating unit 18a ,

4 shows a flowchart of a method 30a for mounting the heater 10a which at least the fluid guide unit 14a for specifying the flow direction 16a of the fluid 12a and at least those in the fluid guide unit 14a arranged heating unit 18a , in particular the heating coil unit, for heat transfer to the fluid 12a includes. In at least one process step, a thermal insulation unit is used 20a for the heating unit 18a at the fluid guide unit 14a arranged. Preferably, the thermal insulation unit becomes 20a during a thermal insulation assembly 88a in the fluid guide unit 14a , in particular in the heating channel 24a arranged, in particular fixed. Preferably, during the thermal insulation assembly 88a the heat insulation unit 20a in at least one step in the heating channel 24a placed, pressed and / or inserted. Preferably, during the thermal insulation assembly 88a the heat insulation unit 20a , in particular at least one heat-insulating element 74a . 76a . 78a . 80a at the fluid guide unit 14a , in particular in at least the mounting half-shell 56a and / or the further mounting half-shell 72a arranged. Preferably, during the thermal insulation assembly 88a the heat insulation unit 20a , in particular at least one heat-insulating element 74a . 76a . 78a . 80a at the fluid guide unit 14a , in particular in at least the mounting half-shell 56a and / or the further mounting half-shell 72a , in particular by means of the fixing unit 26a , positively and / or positively fixed. Preferably, during a heating unit assembly 90a in at least one method step, the heating unit 18a in the fluid guide unit 14a arranged. Preferably, in at least one process step, the heating unit 18a along the longitudinal axis 22a of the heating channel 24a arranged. In particular, in at least one method step, the heating unit 18a in the mounting half-shell 56a and / or the further mounting half-shell 72a arranged. Preferably, in at least one process step, the heating unit 18a at the heat insulation unit 20a , in particular on at least one heat insulating element 74a . 76a . 78a . 80a arranged. Alternatively, the thermal insulation unit 20a , in particular a hose element of the thermal insulation unit 20a and / or a tubular element of the thermal insulation unit 20a , on the heating unit 18a arranged, in particular, the heating unit 18a inside the heat insulation unit 20a arranged, and together in the fluid guide unit 14a arranged. Preferably, during a fluid guide unit closure 92a in at least one step, the mounting half-shell 56a and the additional mounting half-shell 72a connected to each other cohesively, in particular welded.

In the 5 a further embodiment of the invention is shown. The following descriptions and the drawings are essentially limited to the differences between the exemplary embodiments, with reference in principle to the same reference components, in particular with respect to components with the same reference numerals, to the drawings and / or the description of the other embodiments, in particular 1 to 4 , can be referenced. To distinguish the embodiments of the letter a is the reference numerals of the embodiment in the 1 to 4 readjusted. In the embodiment of 5 the letter a is replaced by the letter b.

5 shows a cross section of a heater 10b for heating a fluid, in particular water, with at least one fluid guide unit 14b for specifying a flow direction 16b the fluid and at least one in the fluid guide unit 14b arranged heating unit 18b , in particular a Heizwendeleinheit, for heat transfer to the fluid. The heater 10b comprises at least a sectionally between the fluid guide unit 14b and the heating unit 18b arranged heat insulation unit 20b , The heat insulation unit 20b is cohesive with the fluid guide unit 14b educated. Preferably, at least one heat insulating element 74b . 76b . 78b . 80b cohesively with a mounting half-shell 56b and / or another mounting half-shell 72b educated. In particular, the mounting half shell form 56b and / or another mounting half-shell 72b and at least one heat insulating element 74b . 76b . 78b . 80b a multi-component injection molded part. The heat insulation unit 20b consists at least essentially of at least one engineering plastic, in particular PPA. A through the heat insulation unit 20b at least partially protected area of the fluid guide unit 14b consists at least partially of at least one standard plastic, in particular PP.

With regard to further features and / or functions of the heating device 10b may refer to the description of 1 to 4 to get expelled. In particular, the heater is 10b to operation with the instantaneous water heater 28a suitable. In particular, the heater is 10b for the procedure 30a suitable, wherein a thermal insulation assembly already during manufacture of the fluid guide unit 14b , in particular the mounting half-shell 56b and / or another mounting half-shell 72b , realized by a multi-component injection molding process.

Claims (10)

Heating device for heating a fluid (12a), in particular water, with at least one fluid guide unit (14a; 14b) for specifying a flow direction (16a; 16b) of the fluid (12) and with at least one heating unit (14a; 14b) arranged in the fluid guide unit (14a). 18a, 18b), in particular a heating coil unit, for heat transfer to the fluid (12a), characterized by at least one heat insulating unit (20a, 20b) arranged in sections between the fluid guiding unit (14a, 14b) and the heating unit (18a, 18b). Heating device after Claim 1 , characterized in that the heat insulation unit (20a, 20b) at least partially, in particular rotationally symmetrical, surrounds the heating unit (18a, 18b) in at least one plane. Heating device after Claim 1 or 2 characterized in that the thermal insulation unit (20a; 20b) along a longitudinal axis (22a; 22b) of a heating channel (24a; 24b) of the fluid guiding unit (14a; 14b) extends over at least substantially the entire maximum extent of the heating channel (24a; 24b) the heating channel (24a, 24b) is arranged. Heating device according to one of the preceding claims, characterized in that the heat insulation unit (20b) is formed cohesively with the fluid guide unit (14b). Heating device according to one of Claims 1 to 4 , characterized in that the heat insulation unit (20a) is formed as an insert. Heating device after Claim 5 , characterized by a fixing unit (26a) for fixing the heat insulation unit (20a) formed as an insert. Heating device according to one of the preceding claims, characterized in that the heat insulation unit (20a; 20b) consists at least substantially of at least one engineering plastic, in particular a polyphthalamide (PPA). Heating device according to one of the preceding claims, characterized in that an area of the fluid guiding unit (14a; 14b) which is at least partially protected by the heat insulating unit (20a; 20b) consists at least partially of at least one standard plastic, in particular polypropylene (PP). Instantaneous water heater, in particular bare-wire water heater, with a heater according to one of Claims 1 to 8th , Method for mounting a heating device, in particular a heating device according to one of Claims 1 to 8th in which at least one fluid guide unit (14a; 14b) for presetting a flow direction (16a; 16b) of a fluid (12a) and at least one heating unit (18a; 18b), in particular a heating coil unit, arranged in the fluid guide unit (14a; to the fluid (12a), characterized in that in at least one method step, a heat insulation unit (20a; 20b) for the heating unit (18a; 18b) is arranged on the fluid guiding unit (14a; 14b).

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