ES2376900T3 - Heating device - Google Patents

Abstract

The heating unit (100) comprises a heating element (1), particularly PTC element, with current supplying unit (3) and insulating unit (10).The heating element in heat conducting connection to heat exchanger body (200) is arranged in receiving cavity (20).The heating element is arranged in the framework (2) as a seperately managebale component.The framework with the heating element is inserted into the receiving cavity for the assembly of heating unit.

Description

Heating device.

The invention relates to a heating device according to the preamble of claim 1.

The known heating devices have a heat exchanger body and resistance heating elements arranged in a housing cavity of the heat exchanger body, surfaces of the housing cavity being pressed against surfaces of the resistance heating elements to ensure good heat transmission . These heating devices are used for multiple purposes, eg in electrical cabinets, to keep the electronics contained therein at operating temperature, even in the case of low outdoor temperatures. They are manufactured on a large scale with different thermal powers. The accepted price in the market is relatively low. However, offering different thermal powers also means an adapted number of resistance heating elements, so that for each thermal power an adapted heat exchanger body must also be provided.

A heating device of the type indicated at the beginning is known, for example, from EP 1 574 803 A. Document WO 03/005770 A discloses an electric flat radiator, which has a low surface temperature. Document DE 20 2005 020765 U1 discloses a heating device according to the preamble of claim 1 and is considered the closest state of the art.

The invention aims to manufacture heating devices of the type indicated at the beginning for different thermal powers with a simplified manufacture and with reduced costs.

This objective is achieved by a heating device according to claim 1.

In particular, the objective is achieved by a heating device, comprising at least one heating element, in particular at least one PTC element, with power supply devices and isolation devices, a heat exchanger body with a first surface for the transfer of heat to an environment and with a housing cavity for housing the heating element, the heating element being arranged in the housing cavity in thermoconductive connection with the heat exchanger body, because the heating element is arranged in a frame such as component can be handled separately and because the frame can be inserted together with the heating element in the housing cavity for mounting the heating device.

An essential point of the invention is, therefore, that a single heat exchanger body can be used for different required thermal powers, since a corresponding number of heating elements can be introduced prior to assembly according to the necessary power, so that costs and storage can be reduced. In addition, a symmetrical arrangement guarantees a uniform pressure. In addition, another essential point of the invention is that, in the assembly, the heating element or a group of heating elements can be mounted much more easily in the heat exchanger body, since the frame facilitates handling.

An embodiment is especially preferable in which the frame has separation devices, in particular spacers or windows, which are realized in such a way that several heating elements can be fixed in the frame separately from each other, preferably in an equidistant manner. In this way a simple arrangement is achieved, if necessary also a symmetrical arrangement and orientation of the heating elements.

The power supply devices preferably comprise electrodes in the form of plates, which can be fixed in the frame together with the heating element or the heating elements. They make a good thermal transfer and also a good electrical contact, as well as being easy to manipulate in manufacturing. In addition, the frame is again advantageous, because again only one piece must be inserted into the heat exchanger body, that is, the frame together with the electrodes fixed therein.

The frame preferably has angular pieces and interlocking hooks for fixing the electrodes. In this way a simple preparation is possible, because after the arrangement of one of the electrodes the heating elements can be inserted by applying the other electrode below.

The frame preferably has first guide devices and the heat exchanger body has second guide devices, which are made to cooperate with each other such that the frame with the heating element

or the heating elements can be inserted in a defined position in the housing cavity. This ensures that the frame together with the heating element or heating elements can be inserted quickly and exactly positioned in the housing cavity, in particular in a mass production. The exact positioning is also advantageous for the pressure by a uniform pressure distribution.

The frame preferably has third guide devices, which are made in such a way that the isolation devices covering the power supply devices, in particular an insulating sheet, eg polyimide, can be fixed in the frame in a certain position .

After the heating elements and electrodes have been inserted and fixed in the previous fabrication in the frame, the third guide devices allow an exact orientation of the insulation devices before insertion into the housing cavity. The coating of the power supply devices with an insulating sheet is especially advantageous, because this process can be carried out without great effort and quickly. In particular, if the insulating sheet is made in one piece and is placed around the power supply devices.

The heat exchanger body is made in a plastically deformable manner so that the housing cavity can be reduced for the firm connection of the heat exchanger body to the heating element or to the heating elements. A plastic deformation of this type can be carried out by compression and bending, the union being maintained in a durable manner if the elements provided for deformation are excessively elongated or subjected to a previous tension, so that a sufficient elasticity effect is maintained, even in case of a heating of the heat exchanger body.

The heating device according to the invention comprises a heat exchanger body with a predetermined wall thickness, which has a second surface for the heat transfer of the heating element or of the heating elements to the heat exchanger body, in which in front of the The second surface is provided with a clamping element to press the heating elements against the second surface and in which the clamping element is connected to the heat exchanger body on one or the other side of the heat exchanger body by means of a plastic connection section respectively deformable, in particular in one piece, reducing the wall thickness between the second surface and the clamping element towards one or another outer side of the heat exchanger body, whereby the surfaces on which it rests are prevented from deforming. n the heating element (s), which permanently improves the transfer t Ermic

In the following, the invention will be explained in more detail with the aid of embodiments. Here show

Figure 1 is a perspective sketch of a heating device with a heat exchanger body according to a first embodiment;

Figure 2 a plan view from above of a heating unit according to a first embodiment, as well as a section along the line A-A;

Figure 3 plan views from above, front views and sections A-A, B-B C-C of a frame in the heating unit as a component, as used in the first embodiment according to Figure 2;

Figure 4 a profile of a heat sink of the heat exchanger body according to the first embodiment;

Figure 5 for a better understanding of the invention, a profile of a heat sink of a heat exchanger body according to the state of the art;

Figure 6 a plan view from above of a heating unit according to a second embodiment, as well as a section along the line A-A;

Figure 7 for the best understanding of the invention, a heating device with a heat exchanger body and a heating unit according to the state of the art;

Figures 8 and 9 schematic representations of the embodiment according to Figures 1 and 4, as well as according to Figures 5 and 7 before and after deformation of the connecting elements and

Figure 10 the heating device manufactured with the heat exchanger body according to the first embodiment and with the heating unit in sections A-A and B-B according to the first embodiment.

In the description set forth below, the same reference signs will be used for the same pieces or pieces that act in the same way.

According to Figure 1, the heating device has a heat exchanger body 200 with a heating unit, which in particular has PTC elements, in a housing cavity 20 of the heat exchanger body 200, 26. The housing cavity 20 is closed at both ends with respectively a shaped piece of plastic 11, the cables 12, 13 being exited through one of them at one end for the outward power supply devices.

The heating unit 100 according to Figure 2 comprises several heating elements 1, although at least one PTC element, which are arranged in a frame 2, in particular of plastic, and between electrodes in the form of plates 3, in particular of aluminum. The heating elements 1 are supplied with current by means of connecting flags 4, 5 of the electrodes in the form of plates 3.

As can be seen in detail in Figure 3, the frame 2 has a rectangular or square base surface and has on two opposite sides respectively a first guide device 6, which is made in the frame in the form of strips. In the frame 2, separation devices 7 are provided, in particular spacers or windows, which extend along the length of the frame 2, with which a heating element or several heating elements 1 can be fixed separately from each other. , preferably in an equidistant manner, in the frame 2. In the areas between the molded strips 6 and the separation devices 7 are provided, on the one hand, bent parts 8 in the form of rectangular elevations on each side and on the edge of the frame 2 and, on the other hand, two interlocking hooks 9 arranged at a distance from each other are provided on each side respectively. With the interlocking hooks 9 the electrodes are held in the form of plates 3, fixing the angular pieces 8 these in a predetermined position.

Figure 2 shows the heating unit 100 assembled with the electrodes 2 inserted in the interlocking hooks 9 and fixed by means of the bent parts 8 in position with the connecting flags 4, 5 and the heating elements 1 inserted between the electrodes 3. Before inserting the heating unit 1 into the housing cavity 20, the electrodes 3 are covered with isolation devices 10 (see Figure 6). The inner sides of the strips 6 form the third guide devices 14 for positioning and fixing the isolation devices 10 inside or outside the frame 2. Therefore, a pre-assembly for assembly can be carried out here.

According to Figure 4, the heat exchanger body 200 has ribs 21, which form a first surface 22, which serves to exchange heat between the heat exchanger body 200 and the ambient air or other fluid medium.

A second surface 25 is arranged inside the heat exchanger body 200, which is arranged in front of a clamping surface 27. This clamping surface 27 is formed by a clamping element 27, which in the present embodiment is realized identically to the heat exchanger body 200, so that these two pieces can also be exchanged, at least theoretically; that is, the heating unit is arranged between two identical heat exchanger bodies 200, 26, so that optimum heat dissipation is guaranteed.

The heating unit 100 wrapped on both sides with the isolation device 10 is located after insertion into the housing cavity 20 between the second surface 25 and the clamping surface 27.

The second surface 25 and the clamping surface 27 are formed identically and are made in such a way that they adapt throughout the surface to the surfaces of the heating unit 100, so that the strips or the first guide devices 6 of the frame 2 protrude from the second surface 25 or the clamping surface 26. In this area, that is, between the second surface 25 and the clamping surface 27 oriented towards an outer side of the heat exchanger body 200, recesses 28 are provided. , in which the strips or the first guide devices 6 of the frame 2 of the heating unit 100 fit. In the recesses 28, other ribs 29 are provided, which are shown in the housing cavity 20 as second guide devices 29, which cooperate with the first guide devices 6 of the frame such that the heating unit 100 can be inserted in a defined position in the housing cavity 20. The other ribs 2 9 are oriented by inserting a heating unit according to the first embodiment respectively towards an area of its frame, which results between the interlocking hooks 9, as well as the bent parts 8 and the strips 6.

In case of a corresponding embodiment of the recesses 28 and of the frame 2, it would be possible that after the insertion of the heating unit 100 the other ribs 29 are also arranged outside the frame.

In the heat exchanger body 200 according to the first embodiment, the wall thickness in the area between the second surface 25 and the other rib 29 is less than the wall thickness in the area of the second surface 25 and the wall thickness in the area between the other rib 29 and the outer side of the heat exchanger body 200 in turn less than the wall thickness in the area between the second surface 25 and the other rib 29, so that the wall thickness of the exchanger body of heat 200 is reduced from the second surface 25.

The heat exchanger body 200 and the clamping element 26 formed identically are joined together by connecting sections 30, 30 ’. In the exemplary embodiment, the heat exchanger body 200, the connecting sections 30, 30 'and the clamping element 26 are made in one piece. The easiest way to guarantee this is by manufacturing the heat exchanger body 200, 26 as an extruded part, in particular aluminum. Manufacturing can be done in “material per meter”, so that only pieces of a length that correspond to the heating units to be assembled should be sawn, which further facilitates assembly and further reduces the price.

The connecting sections 30, 30 'have a cross section in V, so that it is easy to perform a deformation by bending with perpendicular forces with respect to the surface of the heating unit 100. The connecting sections 30, 30' comprise in particular respectively a bent element 31, which is connected by thinner points of material, which act as hinges 32, 33, to the heat exchanger body 200 or to the clamping element 26. In the case of the bent elements of this type, it should only apply a relatively reduced force to ensure plastic deformation. In addition, in this way it can be ensured that the material is deformed exactly in the place desired by the builder.

Between the part arranged further inside the connecting section 30, which acts as an angled element 34, and the hinges 32, 33 are arranged relatively rigid connecting sections 35, 36.

The heat exchanger body 200, which has been described for a better understanding of the invention and which refers to the state of the art and that of Figure 5 is distinguished in its configuration of the heat exchanger body according to the first embodiment, because in the recesses 28 no other ribs 29 are provided. Otherwise, the reference signs in Figure 5 refer to the same parts and to the parts that act in the same manner as in the first embodiment. Also in this embodiment, a decreasing wall thickness in the area between the second surface 25 and the outer side of the heat exchanger body 200 may be advantageous.

Unlike the first embodiment, in the heating unit 100 according to Figure 6, the interlocking hooks 9 and the angular pieces 8 are arranged on the edge of the frame 2, in which the electrodes and the electrodes are fixed and fixed. Isolation devices or electrodes only. Also here, the reference signs in Figure 6 refer to the same parts and to the parts that act in the same manner as in the first embodiment.

To mount the heating unit 100 on the heat exchanger body 200, 26 such that the second surface 25 and the clamping surface 27 are firmly seated against the surfaces of the heating unit, according to Figures 4 and 5, a Heating device is performed with a heat exchanger body and a heating unit with compression tools 40, 42, which can attack in the area of the recesses 28 on the surface 22 of the heat exchanger body 200 or on the corresponding surface of the tightening element 26. The pressure for deformation is therefore applied outside the area of the heating unit 100, so that the small excess necessary elongation of the connecting sections 30, 30 'can be carried out without dangers for the heating unit

100. A certain excessive elongation is necessary, since the bent elements 31 can return elastically a little, even in case of elastic deformation, therefore maintaining a sufficient elasticity effect, also in case of a heating of the heat exchanger body 200, 26.

When these compression tools approach each other, the second surface 25 and the clamping surface 27 approximate the surfaces of the heating unit 100, until they come into contact with them.

During this process the bent elements 31 are folded, as it is also shown schematically in Figures 8 and 9. No bending moment is exerted on the heat exchanger body 200 or the clamping element 26, in particular in a configuration with a decreasing wall thickness, so that the deformation of these by additional forces, which do not reinforce the clamping pressure, is prevented. Therefore, the surfaces on which the heating unit 100 rests are not bent, which permanently improves the thermal transfer.

Since the angled element 31 looks out of a recess of the heat exchanger body 200, 26, the assembly of the heat exchanger body 200, 26 is facilitated. Thanks to the previous conformation of the angled elements 31 with a cross section in V or at U, a precise conformation of the connecting sections 30, 30 'with simple means is possible.

Alternatively, if necessary in addition to the compression tools 40-43, which move in the perpendicular direction with respect to the surface of the heating unit 100, it is also possible to work with compression tools 44, 45 (see Figures 4 or 5), which engage directly in the connecting sections 30, 30 '

or in the angled elements 31 and which can approach each other in parallel to the surfaces of the heating unit 100. With this application, the angle of bending is also reduced to (see Figure 4 or Figure 5) of the elbow elements 31, so that the second surface 25 and the clamping surface 27 are pressed against the surfaces of the heating unit 10.

According to FIG. 10, the heating device thus manufactured with a heat exchanger body 200, 26 and a heating unit 100 respectively presents the heating unit 100 according to the first embodiment in the housing cavity 20, the electrodes being covered 3 with an isolation device 10, in particular an insulating sheet, and shaped plastic parts 11 that close the housing cavity 20 at both ends. Through a shaped piece of plastic, the cables 12, 13 connected with the connecting flags 4, 5 go outwards. The shaped plastic parts 11, which close the housing cavity 20, can at the same time serve to keep the heating unit 100 before the forming process during forming in the adjusted position.

Each of the heating units 100 described can be inserted into one of the two heat exchanger bodies 200, 26 described.

List of reference signs

100 Heating unit 1 Heating element, PTC element 2 Frame 3 Power supply devices, electrodes 4 Connection flag 5 Connection flag 6 First guide device, strip 7 Separation devices, window 8 Elbow piece 9 Interlocking hook 10 Device insulation 11 Plastic shaped hook 12 Cable 13 Cable 14 Third guide device, terminal strip 200 Heat exchanger body 20 Housing cavity 21 Nerve 22 First surface 25 Second surface 26 Clamping element 27 Clamping surface 28 Cut-out 29 Second guide device, other rib 30, 30 'Binding section 31 Bending element 32 Hinge 33 Hinge 34 Bending element 35 Binding section 36 Binding section 40-45 Compression tool

Claims (7)

1.-Heating device, which comprises at least one heating element (1), in particular at least one PTC element, with power supply devices (3) and isolation devices (10), a heat exchanger body (200) with a first surface (22) for the transfer of heat to an environment and with a housing cavity (20) for housing the heating element (1), the heating element (1) being arranged in the housing cavity (20) in thermoconductive connection with the heat exchanger body (200), the heating element (1) being arranged in a frame (2) as a separately manipulable component and the frame (2) being able to be inserted together with the heating element (1) in the housing cavity (20) for mounting the heating device and the heat exchanger body (200) presenting a second surface (25) for the heat transfer of the heating element or of the heating elements (1) to the heat exchanger body (200), a clamping element (26) being provided in front of the second surface (25) to press the heating elements (1) against the second surface (25) and the clamping element (26) being attached, in particular in one piece, to the Heat exchanger body (200) on one or the other outer side, respectively, by means of a plasticly deformable junction section (30, 30 '), characterized in that the wall thickness between the second surface (25) and the clamping element (26) decreases towards the one and the other outer side of the heat exchanger body (200). 2. Heating device according to claim 1, characterized in that the frame (2) has separation devices (7), in particular spacers or windows, which are made in such a way that they can be fixed in the frame (2) several heating elements (1) separated from each other, preferably equidistant. 3. Heating device according to one of the preceding claims, characterized in that the power supply devices (3) comprise electrodes in the form of plates, which can be fixed in the frame (2) together with the heating element or elements heaters (1). 4. Heating device according to one of the preceding claims, in particular according to claim 3, characterized in that the frame (2) has angular pieces (8) and interlocking hooks (9) for fixing the electrodes (3). 5. Heating device according to one of the preceding claims, characterized in that the frame (2) has first guide devices (6) and the heat exchanger body (200) has second guide devices (29), which are made by cooperating with others such that the frame (2) can be inserted together with the heating element or the heating elements (1) in a defined position in the housing cavity (20). 6. Heating device according to one of the preceding claims, characterized in that the frame (2) has third guide devices (14) that are made in such a way that the insulation devices (10), in particular an insulating sheet, e.g. eg polyimide, which cover the power supply devices (3) can be fixed in the frame

(2)

 in a predetermined position.

7. Heating device according to one of the preceding claims, characterized in that the heat exchanger body (200) is plastically deformable so that the housing cavity

(twenty)

 it can be reduced for the firm connection of the heat exchanger body (200) to the heating element or to the heating elements (1).