DE20004518U1 - Attachment for heating cartridge - Google Patents

Description

NEYMEYER & PARTNER GbR, Patent Attorneys * J J J JJ .* 1*1* 78052 Villingen-Schwenningen (DE)

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TH 07 March 2000

Applicant: Türk + Hillinger GmbH 78532 Tuttlingen

Applicant No.: 1522213

Description: Mounting for heating cartridge

Description

The invention relates to a device for fastening the metal tubular sleeve, which is open at one end, of an electric heating cartridge to a metal, at least partially round holder which can be inserted into the wall of a cavity containing a medium to be heated and with which the heating cartridge is positioned in the cavity.

Electric heating cartridges with a tubular sleeve open at one end, from which the connecting strands or connecting wires of the heating element housed in the tubular sleeve are led out, are usually fixed firmly and immovably in holders by means of which they can be fastened in the wall of a cavity in which a medium to be heated, e.g. a liquid, a wax or the like, is located.

NEYMEYER & PARTNER GbR, Patent Attorneys ¹ JJJJJ , · \ Jj J 78052 Vfflingen-Schwenningen (DE)

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These holders are usually provided with a thread that can be screwed into a threaded hole in the wall in question.

However, there are also applications in which it is necessary to attach the heating cartridge with its tubular sleeve to the holder in a pivotable manner, so that the heating cartridge can be pivoted in all directions relative to the holder or its axis by at least a small angle of about 5° to 10°.

This requirement arises, for example, when such a heating cartridge with the holder attached to it has to be installed in heating or cooling systems that are relatively closely surrounded by other construction elements or components and it is not possible to insert the heating cartridge with the holder straight into the wall opening provided for this purpose in the cavity containing the medium.

The invention is therefore based on the object of creating a device of the type mentioned at the outset with which it is possible to connect the heating cartridge in a simple manner but in a non-detachable manner in such a way that the heating cartridge can be pivoted in all directions by an angle of at least 5° with little axial play in the holder relative to its axis.

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This object is achieved according to the invention in that the pipe sleeve, which is open at one end, is provided with a radially outwardly widened edge which is arranged with axial and radial play in an annular groove of the holder, wherein the end section of the pipe sleeve immediately adjacent to the widened edge is enclosed by an annular collar of the holder which projects radially inwards relative to the annular groove.

The design according to the invention not only enables the heating cartridge to be pivoted in the holder, but also creates a connection that can be produced using simple means and in a simple manner, which is non-detachable and limits the axial mobility of the heating cartridge in the holder to a minimum.

As provided in claims 2 and 3, the extended edge of the tubular sleeve can be formed in different ways, the embodiment according to claim 2 probably representing the simplest and most advantageous way.

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The design according to claim 4 enables the expanded edge of the pipe sleeve to be introduced into the holder or its annular groove in a very simple manner, whereby the production of the final state, by means of which the permanent connection between the pipe sleeve and the holder is created, is made possible in a simple manner by bringing a conical peripheral section into its approximately cylindrical final shape, for example by means of a conical press sleeve.

The embodiment according to claim 5 serves to facilitate the use of a conical press sleeve which is pushed from the front side over the conical peripheral section from which the heating cartridge protrudes from the holder.

With the aid of the design according to claim 6, it is achieved that the pivotability of the tubular sleeve in the holder is maintained with minimal radial play.

The embodiments according to claims 7 to 10 relate to design details of the holder, which are a prerequisite for achieving the desired properties.

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NEYMEYER& PARTNERGbR, Patent Attorneys ·· · * JJ _&psgr; ' « J · » 78052 Villingen-Schwenningen(DE)

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shafts of the connection between the pipe sleeve and the holder, wherein claims 11, 12 and 13 contain further advantageous embodiments of the invention.

The invention is explained in more detail below with reference to the drawing. It shows:

Fig. 1 shows in section the arrangement of a heating cartridge with holder in the wall of a cavity containing, for example, liquid;

Fig. 2 shows an enlarged sectional view of the lower section of a holder accommodating the heating cartridge in its original form;

Fig. 3 partially cutaway of the upper end section of the tubular sleeve of the heating cartridge to be connected to the holder:

Fig. 4 also shows in section the lower holder section of Fig. 2 in its final form with permanently connected heating cartridge;

Fig. 5 shows the lower end section of the holder shown in Fig. 2 in its initial form with

NEYMEYER & PARTNER GbR, Patent Attorneys ¹ JJJ J *, , * » &iacgr; » &Idigr; ⁷⁸⁰⁵² VUüngen-Schwenningen (DE)

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a pressing sleeve used to deform it;

Fig. 6 the upper end section of the tubular sleeve of the heating cartridge with welded flange ring;

Fig. 7 the upper pipe sleeve end with a positively attached flange ring.

Fig. 1 shows in solid lines and in natural size a heating cartridge 1 which is attached to a substantially multi-stage cylindrical holder 2 and is attached by means of this holder 2 in an upper horizontal wall 3 of a cavity 4 filled with a medium (not shown), e.g. a liquid. This cavity is enclosed by the upper horizontal wall 3, two further vertical walls 5 and 6 and by a bottom wall 7.

To accommodate the holder 2, the upper wall 3 is provided with a correspondingly designed, continuous vertical bore 8.

Phantom lines show how the heating cartridge 1 can be pivoted in all directions relative to the central axis 9 of the holder 2 by an angle Wl of approximately 5° to 10°. If necessary, this angle Wl can be adjusted by

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NEYMEYER & PARTNER GbR, Patent Attorneys * J J J J* .* ? » 'j ' 780S2 Vülingen-Schwenningen (DE)

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The angle can also be limited to less than .5° or increased to more than 10° depending on the design of the holder 2.

Above the housing 10 enclosing the cavity 4
For example, a component 11 is arranged near the axis 9, which prevents the heating cartridge 1 with the holder 2 from being inserted in an exactly vertical position through the bore 8 into the cavity 4.
the image reproduced in phantom lines is recognizable,
that the holder 2 must assume an inclined position in order to be able to pass the component 11 when the heating cartridge 1 is inserted through the bore 8 into the cavity 4
becomes.

It is therefore necessary to attach the heating cartridge, which is provided with a tubular sleeve 12 open at the top, to the holder 2 in such a way that the pivoting by the angle
Wl is made possible in all directions. This should include both
the axial and radial movement of the
Pipe sleeve 12 or the heating cartridge 1 in the holder 2 should be kept as small as possible.

NEYMEYER & PARTNER GbR, Patent Attorneys '.JJJ * · _&bgr; * * · · * 78052 Villingen-Schwenningen (DE)

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In order to maintain or create such a connection or fastening of the metal, usually made of aluminum, tubular sleeve 12 of the electric heating cartridge 1, which is open at its upper end, to the essentially round holder 2, the tubular sleeve 12 is provided at its upper, open end with a radially outwardly widened edge 15, which is arranged with axial and radial play in an annular groove 18 of the holder 2. The end section 19 of the tubular sleeve 12 immediately adjacent to the widened edge 15 is enclosed by an annular collar 20 of the holder 2 which projects radially inwards relative to the annular groove 18.

In the embodiment of Fig. 3, the expanded edge 15 is formed by widening the pipe sleeve end. However, it is also possible to form the expanded edge as a flange ring 16, which, as shown in Fig. 6, is firmly connected to the upper open end 19 by gluing or welding. Another possibility is to secure the flange ring 16 in a form-fitting manner by appropriately deforming the upper pipe sleeve end 19. In this case, the upper pipe sleeve end 19 has a radially outwardly projecting support edge 22 below the flange ring 16 and a

Neymeyer& PARTNERGbR, Patent Attorneys ¹ JJ | Jj ,· » * « * 78052 Villingen-Schweraiingen(DE)

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Flange ring 16 has a radially outwardly flanged end edge 23.

The initial shape of the lower section of the holder 2, which receives the upper sleeve end 19 of the heating cartridge 1, is shown in its initial shape in Fig. 2. It can be seen that the holder 2 is provided with a conical peripheral section 24 in the axial region of its end section comprising the annular groove 18 and the annular collar 20, which extends in the direction of the heating cartridge 1 and adjoins a cylindrical section 25. As a result of the conicity of the section 24, the diameter d5 of its end edge 26 is larger than the diameter d6 of the cylindrical section 25. The end edge 26 of this conical peripheral section 24 is either conically bevelled in the opposite direction or, as shown in the exemplary embodiment, is provided with a rounding radius R of 0.2 mm to 1 mm. This rounding or conical bevel has the purpose of achieving better sliding properties when deforming using the press sleeve 30 shown schematically in Fig. 5.

The cone angle W2 of the conically expanded circumferential section 24 is a maximum of 60°. The annular groove 18 is also

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NEYMEYER & PARTNER GbR, Patent Attorneys ¹ J | j JJ , * * * '♦♦ 78052 VüTingen-Schwenningen (DE)

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provided with two opposing conical ring surfaces 18/1 and 18/2. The conicity of the ring surface 18/1 with its cone angle W3 corresponds at least approximately in both direction and size to the conicity or cone angle W3 of the conically expanded peripheral section 24. The conicity or cone angle W4 of the oppositely conical ring surface 18/2 is between 70° and 90°. W4 is selected so that after deformation, i.e. after the radial inward pressing of the conical peripheral section 24 into the at least approximately cylindrical final shape shown in Fig. 4, the ring surface 18/2 runs at least approximately parallel to the opposite, flat ring surface 17 and thus approximately at right angles to the central axis 9 ^T of the holder 2. The ring surface 18/1 thereby assumes a position approximately parallel to the axis.

In the initial form of the holder 2 shown in Fig. 2, the conical section 18/2 of the annular groove 18 is adjoined to the front side 29 by an annular surface 28 which is conical in the opposite direction to the conicity of section 18/2 and whose cone angle W5 is smaller, e.g. approximately half as large as the cone angle W2 of the peripheral section 24 which is conical in its initial form. This results in a cone angle W6 (Fig. 4) for the annular surface 28 in its final form which is approximately the same size as the original cone angle.

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NEYMEYER & PARTNER GbR, Patent Attorneys *J J * J J .' * Jj-? 78052 VUlingen-Schwenningen (DE)

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angle W5. However, in the final state, the conicity of the ring surface 28 is opposite to that of the initial shape. While the ring surface 28 widens towards the front face 29 in the initial state, the ring surface 28 in its final shape shown in Fig. 4 has a narrowing in the direction of the front face 29. The conicities of the ring surface 28 are thus opposite to one another in the initial state and in the final state.

The two mutually oppositely conical ring surfaces 18/2 and 28 form in their initial form an inner ring edge 27, the diameter d2 of which should be at least as large as the diameter d3 of the extended edge 15 or the flange ring 16. In order to be able to easily insert the edge 15 or the flange ring 16 into the ring groove 18, it is more advantageous to select d2 at least slightly larger than d3.

The front annular surface 29', which is flat in the initial form of the holder 2, also undergoes a change during the deformation of the conical peripheral section 24. As can be seen from Fig. 4, it also runs conically in the final form of the holder 2, whereby the angle W7 which the annular surface 28 already made in the initial form with

NEYMEYER & PARTNER GbR, Patent Attorneys JJJ % ', .* 5 J &iacgr; * 78052 Villingcn-Schwcnningen (DE)

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the annular surface 18/2 of the annular groove 18 is maintained.

For the passage of the connecting wires 31 of the heating cartridge 1, the holder 2 is provided with a central cylindrical through-bore 33 which ends with a conical extension 34 in the annular groove 18.

The remaining parts or sections of the holder 2 can be different or have any shape. Only the lower end region, which receives the upper end section of the sleeve 12 of the heating cartridge 1, is essential to the invention.

Because of the required strength and thermal load, the holder 2 is usually made of a suitable metal, e.g. brass, which can not only be easily machined but can also be cold formed using the press sleeve 30. The press sleeve 30 is provided with a conical press section 36, which is followed at the bottom by a cylindrical bore 35, the diameter d7 of which is at least approximately the same size as the diameter d6 of the cylindrical section 25. Preferably, this bore 35 can also be made smaller by about 0.2

NEYMEYER & PARTNER GBR, Patent Attorneys ·; J ** ;*";**** «"ti**; 78052 Vülingen-Schwenningen (DE)

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mm to 0.3 mm larger than the diameter d6 of the cylindrical section 25. If the diameter d.7 of the bore 35 is chosen to be the same size as the outer diameter d6 of the cylindrical section 25, then when the press sleeve 30 is pushed in the direction of the arrow 38, i.e. from the lower end face 29 over the conical peripheral section 24, a deformation results, the final state of which is shown in Fig. 4 and described above.

It can be seen in Fig. 4 that the radially outwardly expanded edge 15 has a certain axial play s and that, as a result of the conical shape of the annular surface 28, the heating cartridge 1 can be pivoted in all directions by the pivot angle Wl, which can be approximately 5° to 10°, whereby the edge 15 in the respective maximum inclined position rests on the one hand on the annular surface 18/2, which in the final state runs approximately at right angles to the axis 9', and on the other hand on the flat annular surface 17 of the annular groove 18.

It is clear that the edge 27 of the annular collar 20, formed by the annular surfaces 18/2 and 28 running obliquely to one another at the angle W7, should in the final state lie on a diameter which is only minimally larger than the diameter dl of the tubular sleeve 12 in order to obtain a minimum radial play.

Claims (13)

1. Device for fastening the metal tubular sleeve (12) of an electric heating cartridge (1), which is open at one end, to a metal, at least partially round holder (2) which can be inserted into the wall (3) of a cavity (4) containing a medium to be heated and with which the heating cartridge (1) is positioned in the cavity (4), characterized in that the tubular sleeve (12), which is open at one end, is provided with a radially outwardly widened edge (15) which is arranged with axial and radial play in an annular groove (18) of the holder (2), the end section of the tubular sleeve (12) which immediately adjoins the widened edge (15) being enclosed by an annular collar (20) of the holder (2) which projects radially inwards relative to the annular groove (18). 2. Device according to claim 1, characterized in that the expanded edge (15) is formed by widening the tubular sleeve end (12). 3. Device according to claim 1, characterized in that the extended edge consists of a flange ring (16) connected in a form-fitting or material-fitting manner to the pipe sleeve end (12). 4. Device according to one of claims 1 to 3, characterized in that the initial shape of the holder (2) in the axial region of its end section comprising the annular groove (18) and the annular collar (20) is provided with a conical peripheral section (24) which adjoins a cylindrical section (25) in a widening manner in the direction of the heating cartridge (1) and which in its final state has at least approximately the cylindrical shape of the cylindrical section (25). 5. Device according to claim 4, characterized in that the outer end edge (26) of the conical peripheral portion (24) is conically bevelled or provided with a rounding radius (R) of 0.2 mm to 1 mm. 6. Device according to one of claims 1 to 5, characterized in that the annular collar (20) in its final shape has a conical annular surface (28) widening towards the annular groove (18). 7. Device according to claim 4 or 5, characterized in that the cone angle (W2) of the conically expanded peripheral portion (24) is a maximum of 60°. 8. Device according to claim 4, 5 or 6, characterized in that the annular groove (18) in its initial form has a first conical annular surface (18/1) whose conicity (W3) corresponds at least approximately to the conicity (W2) of the conical peripheral portion (24). 9. Device according to claim 4, 5 or 6, characterized in that the annular groove (18) in its initial form has a second conical annular surface (18/2) whose conicity (W4) is opposite to the conicity (W3) of the first annular surface (18/1) and is approximately half as large as the conicity (W2) of the peripheral portion (24). 10. Device according to claim 1, characterized in that the annular collar (20) in its initial shape has an inner diameter (d2) which is at least equal to the outer diameter (d3) of the enlarged edge (15, 16) of the tubular sleeve (12). 11. Device according to one of claims 1 to 9, characterized in that the inner surface (28) of the annular collar (20) in its initial shape has a conicity (W5) widening away from the annular groove (18) which is smaller than the cone angle (W2) of the conical peripheral section (24). 12. Device according to one of claims 1 to 9, characterized in that the holder (2) has an axial bore (33) ending in the axial plane of the annular groove (18) and concentric with the annular groove (18) and the annular collar (20) for the passage of the connecting strands (31) of the heating cartridge (1). 13. Device according to claim 4, characterized in that an axially attachable press sleeve (30) with a partly conical and partly cylindrical press bore (36; 35) is provided for the radial deformation of the conical peripheral section (24).