DE102022121595B3 - Mounting for heating resistor - Google Patents

Abstract

The invention relates to a receptacle 3 for a heating resistor 1 for insertion into an exhaust pipe 4, the heating resistor 1 being brought into a shape with several heating loops 1.3a, 1.3b, 1.3c arranged next to one another, which form a basic shape_G with a central axis 1.4 , with adjacent heating loops 1.3a, 1.3b delimiting a groove 1.6 with a groove axis 1.6a, with a one-part or multi-part bearing element 3.1 being provided, which serves to accommodate and support the heating resistor 1, the heating resistor 1 being indirectly via the one or multi-part bearing element 3.1 can be fixed in the exhaust pipe 4, with spacer elements 3a, 3b, 3c being provided which can be inserted into the respective groove 1.6 in order to keep adjacent heating loops 1.3a, 1.3b at a distance.

Description

The invention relates to a receptacle for a heating resistor for insertion into an exhaust pipe, the heating resistor being brought into a shape with several heating loops arranged next to one another, which form a basic shape_G with a central axis, with adjacent heating loops delimiting a groove with a groove axis or the Heating resistor has a basic shape_G with a central axis, in which a plurality of heating loops arranged next to one another are formed, a one-part or multi-part bearing element being provided which serves to accommodate and support the heating resistor, the heating resistor being able to be fixed indirectly via the one-part or multi-part bearing element in the exhaust pipe is, with spacer elements being provided which can be inserted into the respective groove in order to keep adjacent heating loops at a distance.

From the US 5,501,842 A A heating resistor with heating loops is known, in which the heating loops are kept at a distance from one another by spacer elements. The heating resistor is surrounded circumferentially with insulation material and is stored in a tubular body using the insulation material.

1. a) um eine komplementäre Gussform zum geschäumten Heizwiderstand mit einem Tragrahmen mit Stabilisationsteilen, die in der jeweiligen Nut positioniert sind oder
2. b) um mehrere Stabilisationsstifte, die jeweils gegen beide Stirnseiten des Heizwiderstands anliegen, wobei ergänzend eine separate Befestigungsvorrichtung mit einem Befestigungsstift vorgesehen ist, der mit dem Tragrahmen gekoppelt ist.

From the DE 20 2021 102 620 U1 A heating resistor with heating loops is known, in which the heating loops are kept at a distance from one another by a stabilization part. This is the stabilization part

1. a) a complementary mold to the foamed heating resistor with a support frame with stabilization parts that are positioned in the respective groove or
2. b) a plurality of stabilization pins, each of which rests against both end faces of the heating resistor, with a separate fastening device being additionally provided with a fastening pin which is coupled to the support frame.

The DE 695 03 574 T2 describes a heating unit and a catalytic converter. The heating unit is mounted in the housing using support means.

The JP H08 218 856 A describes a heating catalytic converter that is mounted in the housing via bearing means.

The invention is based on the object of designing and arranging a heating resistor and its receptacle in such a way that simple production and assembly as well as optimal storage are guaranteed.

The object is achieved according to the invention in that at least some of the spacer elements serve as holding elements and can be placed in the area B of an open end of the respective groove, the respective spacer element being designed as a pin with a first pin end and a second pin end and a longitudinal axis, whereby the respective spacer element can be inserted into a recess in the bearing element in the direction of the longitudinal axis and at least one pin end can be mechanically connected directly to the bearing element. This ensures that in one assembly step both the spacer elements are placed within the respective groove and a positive connection between the bearing element and the respective spacer element is possible. The respective holding element can thus be placed near the open end of the respective groove. The pin shape ensures that the holding element can be inserted into corresponding recesses in the bearing element. The area B extends to a maximum length that corresponds to half the radius of the basic shape_G of the heating element.

It can also be advantageous in this regard if the at least one bearing element is designed as a one-part or multi-part receiving frame, by means of which the heating resistor can be at least partially circumferentially enclosed. The bearing element can completely circumferentially surround the heating resistor as a two-part frame. Alternatively, several, here at least three, bearing element parts can also be provided, which can be placed in segments on the heating element, so that the heating element is provided with a bearing element part at at least three points and can therefore be fixed.

Furthermore, it can be advantageous if the spacer elements are made of metal, with only a part of the respective spacer element being provided with insulation and one pin end being designed to be insulation-free. The metallic design of the spacer element ensures a simple connection to the bearing element, in particular by welding or soldering. This is accompanied by the need for the respective end of the spacer element to be designed to be insulation-free, meaning that the metallic spacer element has corresponding electrical insulation in the area of the contact zones with the heating resistor.

It can also be advantageous if the at least one bearing element is made of metal and an insulation layer is provided that can be placed between the receiving frame and the heating resistor. What was said above applies here. The metallic design of the bearing element ensures a simple connection to the corresponding spacer element by welding or soldering. They are also common when it comes to the bearing element The contact surfaces are electrically insulated with the heating resistor.

It can advantageously be provided that the at least one bearing element has at least one retaining tab which extends in a direction_R transverse to a circumference_U of the bearing element, the respective retaining tab being mechanically connectable to at least one spacer element. To ensure that the spacer elements are accommodated right up to their introduction into the corresponding recess in the bearing element, partial retaining tabs are advantageous, as this leaves a maximum of the passage area of the heating resistor free for the exhaust gas to be heated.

It can be of particular importance for the present invention if the at least one bearing element has a U- or L-shaped cross-sectional profile Q. In the case of an L-shaped cross-sectional profile Q, a positive connection between the spacer element and the bearing element is only necessary on one side.

In connection with the design and arrangement according to the invention, it can be advantageous if the spacer element is cylindrical and has a stop shoulder at the end, which can be placed against the at least one bearing element. By forming a stop shoulder, a depth stop is provided when inserting the spacer element into the corresponding recess. This simplifies the subsequent welding or soldering. The longitudinal axis of the spacer element can be aligned parallel to the central axis of the heating resistor or at least aligned in the direction of the central axis of the heating resistor.

It can also be advantageous if the spacing element has a head at the end, which can be placed against the at least one bearing element. The use of a head on the spacer element ensures, on the one hand, a depth stop. On the other hand, soldering or welding is only necessary on one side or on the side of the spacer element opposite the head.

The task is also solved by a heating element, consisting of a receptacle as described above and a heating resistor stored and fixed therein.

Furthermore, it can be advantageous if the at least one bearing element is welded or soldered to at least one spacer element. In this case, a corresponding weld seam can be provided in a simple manner at the respective open end of the respective holding element.

It can be advantageous if the groove of adjacent sections has a groove width_bn, with an increased groove width_bv being provided in the area of the respective spacer element. Against the background of the narrowest possible grooves within the heating resistor in order to maximize the area to be heated, corresponding groove widths at the open end of the respective groove are advantageous in order to ensure a sufficient size or width of the spacer element to be used.

Finally, it can be advantageous if the retaining tab extends in the direction of the groove axis and/or that the longitudinal axis is aligned parallel to the central axis. The respective holding tab is therefore positioned in such a way that it or its center can be placed in the area of the respective open end of the respective groove, so that the corresponding spacer element can be guided into the groove via the recess.

The task is also solved by a system consisting of a heating element and at least part of an exhaust system in the form of an exhaust pipe and / or catalytic converter housing, the heating resistor being arranged or mounted within the exhaust system.

• 1 einen Heizwiderstand;
• 2 eine Aufnahme mit einem Heizwiderstand;
• 3 die Schnittdarstellung A-A nach 2;
• 4 eine alternative Querschnittsform;
• 5 eine Teilabgasanlage;
• 6a den Aufnahmerahmen;
• 6b Schnittdarstellung aus 6a.

Further advantages and details of the invention are explained in the patent claims and in the description and shown in the figures. Show it:

• 1 a heating resistor;
• 2 a receptacle with a heating resistor;
• 3 the sectional view AA 2 ;
• 4 an alternative cross-sectional shape;
• 5 a partial exhaust system;
• 6a the recording frame;
• 6b Sectional view 6a .

One after 1 The heating resistor shown has a circular basic shape_G. The heating resistor has several grooves 1.6, which are alternately guided inwards from the outer edge. This one gives after the 1 several connected heating loops 1.3a, 1.3b, which extend in a meandering manner from a left to a right side of the heating resistor. Each heating loop 1.3a - 1.3c thus has two sections or legs 1.3, which are separated from each other by the groove 1.6. In the area of the respective groove end B, the respective groove of width bn has an area of increased width bv. The respective groove Axis 1.6a runs at right angles to one 3 shown central axis 1.4 of the heating resistor 1.

After 2 a heating element 10 is shown, consisting of a heating resistor 1 inserted into a bearing element or into a receiving frame 3.1 as part of a receptacle 3. The receiving frame 3.1 has several retaining tabs 3.2 distributed over the circumference_U, which are in the area of the respective groove or the respective end of the groove are placed. The respective retaining tab 3.2 shows as shown 3 You can see a corresponding recess 3.9, into which the respective spacer element 3a to 3c can be inserted or inserted parallel to the central axis 1.4 of the heating resistor 1. Thus, at the respective open end of the respective groove 1.6 there is a positive connection between the receiving frame 3.1 and the respective spacer element 3a to 3c. Likewise, the heating resistor 1 is fixed in a form-fitting manner within the receiving frame.

According to sectional view AA 2 the receiving frame has a U-shaped cross-sectional profile Q, which circumferentially surrounds the heating resistor. In the area of the respective holding tab 3.2, the receiving frame 3.1 has the recess 3.9, through which the respective spacer element is inserted parallel to the central axis 1.4. The respective spacer element 3a to 3c is thus positioned in the area of the groove 1.6. It has insulation 2.2 in the central area between the two cheeks of the holding frame 3.1, which prevents electrical contact with the heating resistor 1. In addition, an insulation layer 2.1 is provided, which is provided between the receiving frame 3.1 and the circumferential edge of the heating resistor. This prevents electrical contact between the heating resistor 1 and the receiving frame 3.1.

The respective spacer element 3a can have a head 3.4 on one side, via which the spacer element 3a rests axially against the receiving frame 3.1. The head 3.4 forms a depth stop for the respective spacer element 3a. A weld seam 3.5 is provided on the opposite side for a material connection to the receiving frame 3.1. Alternatively, according to the right half of the picture, the spacer element 3a can also have a contact shoulder 3.3, which forms the corresponding depth stop. In this case, as an alternative to the head 3.4 shown, a corresponding weld seam 3.5 would be provided on both sides.

The recording frame 3.1 according to 3 In this exemplary embodiment, it has the same central axis 1.4 as the heating resistor 1.

According to the schematic diagram in 4 In contrast to the U-shaped cross-sectional profile Q, the receiving frame can also have an L-shaped cross-sectional profile. In this embodiment variant, a mechanical connection between the spacer element 3a and the receiving frame 3.1 is only possible on one side. Opposite would be in a corresponding manner as in 3 shown, a head 3.4 is to be provided, which comes into axial contact with the heating resistor 1, taking into account appropriate electrical insulation.

After 5 1 shows a part of an exhaust system 4 consisting of an exhaust pipe or a catalytic converter housing, with the heating element 10 being mounted inside the exhaust system 4.

6a shows the receiving frame 3.1 alone with the integral retaining tabs 3.2. The holding tabs 3.2 have openings 3.2a or extinguishers on both sides into which the spacer elements 3a to 3c, not shown here, are inserted. According to sectional view BB 6b is a spacer element 3a (shown in dashed lines) inserted into the openings 3.2a on both sides of the holding tabs 3.2 on both sides for the purpose of attachment to both holding tabs 3.2.

Reference symbol list

1

Heating resistance

1.3a

heating loop

1.3b

heating loop

1.3c

heating loop

1.3

Section or leg from 1.3a-1.3c

1.4

Central axis of 1

1.6

Nut

1.6a

groove axis

1.7

open end

2.1

Insulation layer, electrical

2.2

Insulation, electrical

3

Recording

3a

Spacer element, holding element

3b

Spacer element, holding element

3c

Spacer element, holding element

3.1

Bearing element, mounting frame

3.2

retaining tab

3.2a

opening, hole

3.3

stop shoulder

3.4

first pen end, head

3.5

second end of the pen

3.6

Longitudinal axis

3.7

Weld

3.8

Central axis

3.9

recess

4

Exhaust system, exhaust pipe, catalytic converter housing

10

Heating element

b

Range from 1.7

Q

Cross-sectional profile

G

Basic form

bn

groove width

bv

groove width

R

Direction

U

Scope

Claims (13)

Recording (3) for a heating resistor (1) for insertion into an exhaust pipe (4), the heating resistor (1) having a basic shape_G with a central axis (1.4), in which one or more heating loops (1.3a, 1.3b, arranged next to one another) 1.3c), the respective heating loop (1.3a, 1.3b) being formed from two adjacent sections (1.3), adjacent sections (1.3) or heating loops (1.3a, 1.3b) having a groove (1.6) with a groove axis (1.6a), wherein a one-piece or multi-part bearing element (3.1) is provided which serves to accommodate and support the heating resistor (1), the heating resistor (1) being indirectly via the one-piece or multi-part bearing element (3.1) in the exhaust pipe (4) can be fixed, with spacer elements (3a, 3b, 3c) being provided which can be inserted into the respective groove (1.6) in order to keep adjacent sections (1.3) at a distance, characterized in that at least some of the spacer elements ( 3a, 3b, 3c) serve as holding elements and can be placed in the area B of an open end (1.7) of the respective groove (1.6), the respective spacer element (3a, 3b, 3c) being designed as a pin with a first pin end (3.4) and a second pin end (3.5) and a longitudinal axis (3.6), wherein the respective spacer element (3a, 3b, 3c) can be inserted into a recess (3.9) of the bearing element (3.1) in the direction of the longitudinal axis (3.6) and at least one pin end ( 3.4, 3.5) can be mechanically connected directly to the bearing element (3.1). Recording (3). Claim 1 , characterized in that the at least one bearing element (3.1) is designed as a one-part or multi-part receiving frame, by means of which the heating resistor (1) can be at least partially circumferentially enclosed. Recording (3). Claim 1 or 2 , characterized in that the spacer elements (3a, 3b, 3c) are made of metal, with only part of the respective spacer element (3a, 3b, 3c) being provided with insulation (2.2) and one pin end (3.4, 3.5) being insulation-free is trained. Recording (3) according to one of the preceding claims, characterized in that the at least one bearing element (3.1) is made of metal and an insulating layer (2.1) is provided which can be placed between the receiving frame (3.1) and the heating resistor (1). Recording (3) according to one of the preceding claims, characterized in that the at least one bearing element (3.1) has at least one holding tab (3.2) which extends in a direction_R transverse to a circumference_U of the bearing element (3.1), the respective holding tab ( 3.2) can be mechanically connected to at least one spacer element (3a, 3b, 3c). Recording (3) according to one of the preceding claims, characterized in that the at least one bearing element (3.1) has a U- or L-shaped cross-sectional profile Q. Recording (3) according to one of the preceding claims, characterized in that the spacer element (3a, 3b, 3c) is cylindrical and has a stop shoulder (3.3) at the end, which can be placed against the at least one bearing element (3.1). Recording (3) according to one of the preceding claims, characterized in that the spacer element (3a, 3b, 3c) has a head (3.4) at the end, which can be placed against the at least one bearing element (3.1). Heating element (10) consisting of a receptacle (3) according to one of the preceding claims and a heating resistor (1) mounted therein. Heating element (10). Claim 9 , characterized in that the at least one bearing element (3.1) is welded or soldered to at least one spacer element (3a, 3b, 3c). Heating element (10). Claim 9 or 10 , characterized in that the groove (1.6) of adjacent sections (1.3) has a groove width_bn, with an enlarged groove width_bv being provided in the area of the respective spacer element (3a, 3b, 3c). Heating element (10) according to one of the Claims 9 until 11 , characterized in that the retaining tab (3.2) extends in the direction of the groove axis (1.6a) and/or that the longitudinal axis (3.6) is aligned parallel to the central axis (1.4). System consisting of a heating element (10) according to one of the preceding Claims 9 until 12 and at least part of an exhaust system (4) in the form of an exhaust pipe and/or a catalyst housing, the heating element (10) being arranged within the exhaust pipe (4).

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