The catalyst electric heating

 

(57) Abstract:

The invention relates to a device for catalytic conversion of exhaust gases in the exhaust system, in particular in the exhaust system of internal combustion engines, preferably internal combustion engines with spark ignition. The device has at least two elements having a honeycomb structure, which are located in a common tubular casing and through which pass through the exhaust gas, and the neighboring elements with a honeycomb structure are mechanically connected with each other supporting elements present inside elements with a honeycomb structure. The first element with a honeycomb structure is installed in the outer tubular casing with a certain gap, and has at least two shells forming the casing surface of the first element, and connected respectively with the supply circuit. The device has elektroizolyatsionnye connecting elements, each of which is connected one end with the corresponding shell, and the other end connected to the adjacent element with a honeycomb structure. General tubular casing has at least one herpes bumps adjacent to the tubular casing of the second element with a honeycomb structure. Ostrosatiricheskih conversion of exhaust gases in the exhaust system, in particular in the exhaust system of internal combustion engines, preferably internal combustion engines with spark ignition, which meets the criteria specified in the restrictive part of paragraph 1 of the claims.

From international application WO 92/13636 known element with a honeycomb structure, with several relying on each other washers. This element has at least two spaced apart from each other at a certain distance washer, through which pass through the exhaust gas. To connect washers between the near axis set support.

However, the manufacture of such element with a honeycomb structure is time-consuming, since the position of the poles on both parts of the element with a honeycomb structure should be clearly established in advance. Pre-installation of supports, however, associated with certain problems, as relatively difficult to manufacture two identical element with a honeycomb structure. It depends, in particular, from the fact that elements with a honeycomb structure composed of rolled metal sheets and when ruanruan impossible to precisely predict the exact position of the grooves for the feet.

Known daduh - the first and second elements with a honeycomb structure through which pass through the fluid medium. Elements with a honeycomb structure are mechanically connected with each other by using incoming into elements with a honeycomb structure supporting elements. With the goal of more rapidly to achieve the required for catalytic conversion of exhaust gas conditions one element with a honeycomb structure is carried out with electric heating. For this purpose, the element with a honeycomb structure provided with at least two connected with the casing surface element takarasiennes, each of which is connected with one electrical power supply. Distributors serve for uniform current distribution. Element with a honeycomb structure electrically heated connected to the tubular casing intermediate insulating layer. The tubular casing has at least two projecting corrugation which are appropriately formed grooves on takarasiennes. These tamarapalli provided protruding outward pins that elektrosokirani from the tubular casing. The pins used for connecting to the electrical heated catalyst. Due to the discrepancies between the s and the shells are experiencing mechanical load. To reduce this mechanical loading tamarapalli provided protruding outward corrugations, thereby resulting force is transferred from tamarapalli tubular housing. Such a device is described in P. F. Kuper, W. Maus and others in SAE Technical Paper Series 940465.

In the manufacture of such a device, the connection of the support element by element with a honeycomb structure carry out soldering. During the soldering process, which is carried out in an appropriate furnace, the insulation layer releases moisture, since this layer is an expanded fibrous material. Allocation of moisture in the atmosphere furnace for soldering affects the soldering process, resulting simultaneously in the same oven you can bind only a very limited number of devices.

The present invention was based on the task to improve the known device in such a way as to provide a simpler design and better manufacturing.

This problem is solved according to the distinctive characteristics of paragraph 1 of the claims. Preferred embodiments of the invention are subject of the dependent claims.

The device according to the invention for catalytically electrically insulating fasteners, each fastening element is connected by its end surface of the casing element with a honeycomb structure having a heater, and the other end connected to the adjacent element with a honeycomb structure. Using these measures, we achieve sustainable in mechanical relation to the connection of the first element with a honeycomb structure, with heating, with the second adjacent element with a honeycomb structure. Electrically insulating connecting elements are perceived due to thermal expansion force so that the contact is not exposed to mechanical loads. Another advantage of this alternative implementation is that you can abandon blown fibrous material between the element with a honeycomb structure having electric heating, and a tubular casing, so that the soldering process can be performed in a known manner. Thanks to the present invention, it became possible to bind in a vacuum furnace at the same time many devices and in the atmosphere of the furnace for brazing will not stand out moisture.

The connecting elements can be soldered to the metal sheet element with a honeycomb structure, if this element is a metal body carrier cat is raspredeliteli can be a metal strip. These metal strips can be connected with at least some of the fastening elements. The connection of the fastening elements with takarasiennes can be carried out by soldering or welding.

Definite advantage is also achieved in the case when tamarapalli made in the form of a shell. Due to this, achieve efficient current distribution element with a honeycomb structure. Each tamarapalli may have a contour that corresponds to the element with a honeycomb structure.

It is proposed to provide two spaced apart from each other at a certain distance and consecutive takarasiennes, which form at least part of the surface of the cover element with a honeycomb structure. With this design, each fastening element connected to only one tamarapalli.

It may be appropriate to provide adjacent the second element with a honeycomb structure of the inner tubular casing and connect fasteners with this inner casing. The connection of the inner casing with mounting elements may be effected by soldering or welding.

If both element with a honeycomb structure connected with on brasno to perform common tubular casing with at least one support internal corrugation thus, to the inner corrugation adjoined to the inner casing adjacent element with a honeycomb structure. This inner corrugation in such a device, in which the inner diameter of the common tubular casing is constant and equal to the external diameter of the element with a honeycomb structure, prevents the flow part of the flow of exhaust gas through the device without purification.

Internal corrugation is preferably performed so that the connection element with a honeycomb structure with a common tubular casing carried out with force closure.

Instead of or in addition to the connection with the power circuit common tubular casing element with a honeycomb structure of the latter in the area of the inner corrugation may be soldered or welded to a common tubular housing. When the connection by soldering General tubular casing element with a honeycomb structure, at least at some stage of it can be covered with a layer of solder.

Internal corrugation on a common tubular casing may be formed prior to installation of the element with a honeycomb structure in this common casing. Internal corrugation should be carried out only in the case when elements with a honeycomb structure is placed in a General truboobrobka structure have freedom of movement not only in the axial but in the radial direction.

Internal corrugation can be made by knurling or radial forging hood, in particular rotary forging. To minimize relative sprains necessary, so that he was near the front side of the second element with a honeycomb structure facing to the first element.

For electrical junction element with a honeycomb structure having electric heating, which is adjacent to the second element with a honeycomb structure, each of the fixing and/or supporting element has first and separated from her second liner covering the corresponding end portions of pins. Between the sleeves and the pin is provided an insulating layer. The advantage of this design is that it provides double insulation. Electrical breakdown between the pin and element with a honeycomb structure can additionally prevent the insulation layer mounted on the end surface of the pin.

Other advantages and distinctive features in more detail below on the example of the preferred option of carrying out the invention. In this case, the relevant drawings shows:

in Fig. 1 is a schematic longitudinal section Mgr II-II and

in Fig. 3 - connecting element in the section.

In Fig. 1 shows a preferred embodiment of a device for catalytic conversion of exhaust gases in the exhaust system. The device includes two sequentially installed in a common tubular casing 1 of item 2, 3 with a honeycomb structure through which the exhaust gas G. the First element 2 with a honeycomb structure is placed in a common tubular housing 1 with a slight clearance and is equipped with electric heating. The outer casing surface of the first element 2 with a honeycomb structure formed by two takarasiennes 4, 5 having the form of a shell. Tamarapalli 4, 5 are connected respectively by leads 6, 7. The current leads 6, 7 protrude outwards through the openings 8, 9 provided in a common tubular casing 1. Current-carrying parts 6, 7 are passed through the connecting elements 10, 11, which are welded to a common casing 1. The connecting element 11 has an insulating layer 13, therefore, the current leads 6, 7 elektrosokirani of the total tubular casing 1.

Two elements 2, 3 are connected to each other by incoming into elements with a honeycomb structure of fasteners 12. For clarity, the example of which the structure has an inner tubular casing 14. Tamarapalli 4, 5 respectively connected to the inner casing 14 of the element 3 with a honeycomb structure using additional fixing element 15.

In General, the tubular casing 1 has two encircling the inner corrugation 16. Internal corrugations 16 are designed so that they come into contact with the inner casing 14 of the element 3 with a honeycomb structure. At contact surfaces between the corrugations 16 and the inner casing 14 may be provided for connection of a specific material.

Internal corrugations 16 preferably near element 2 with a honeycomb structure having electric heating, thus avoiding too large relative extensions.

In Fig. 3 shows a longitudinal section of the fastening element 15.

The fastening element 15 has a first sleeve 17 and separated from her second sleeve 18, each of which covers a respective end sections of the pin 19. Between the sleeve 17, respectively 18 and pin 19 has an insulating layer 20, 21 respectively, through which the pin 19 has no capacity even when the sleeves 17, 18 are energized. Electric strength at break of the support elements is doubled. is thanks to this reach of reducing the number of different parts in the manufacture of the device. Electrical separation of elements with a honeycomb structure between them is improved when using the same fastening elements and supporting elements.

In Fig. 3 shows a possible design of the support element. As can be seen in Fig. 3, on the end surface of the pin 19 can optionally be applied insulating layer 22. Instead of applying insulating layer only on the end surface of one of the pin layer can be applied to the entire end surface of the site. For this example, the fastening elements and the supporting elements are immersed their end surfaces in the mass, which has insulating properties and which after drying at elevated temperatures and remains on the end surfaces.

However, double electrical insulation can not be used if the design of the connecting element or electrical characteristics of the element 3 with a honeycomb structure such that there is no fear of a short circuit.

Device for catalytic conversion of exhaust gases produced as follows. First to join together in a single structural element, both elements 2, 3 with a honeycomb structure using the reference Almedina, in particular by welding, the current leads 7 and 6 to takarasiennes 4, 5. At the same time by welding the connecting elements 10, 11 are secured on a common tubular casing 1. Then make internal bumps 16 on a common casing 1.

Prepared in this way the device can be placed in a vacuum furnace for brazing, in which the total tubular casing 1 is connected with the inner tubular casing 14. For this purpose, the inner casing 14 in preparation put a layer of solder. Upon completion of the soldering process, the device can be submitted for final treatment.

1. Device for catalytic conversion of exhaust gases in the exhaust system, in particular in the exhaust system of internal combustion engines, preferably internal combustion engines with spark ignition, which has at least one first and one second element (2; 3) with a honeycomb structure, which are consistently located in the same General tubular casing (1) and through which exhaust gas, and at least the first element (2) with a honeycomb structure having electric heating and has at least one tamarapalli (4; 5), installed in the external trubor other support elements (12), included inside elements (2; 3) with a honeycomb structure, characterized by the presence of additional elektroizolyatsionnyh fastening elements (15), each fastening element (15) is connected to one of its end section with the casing surface of the first element (2) with a honeycomb structure having a heater, and its second end connected to the adjacent second element (3) with a honeycomb structure.

2. The device under item 1, characterized in that tamarapalli (4; 5) forms part of the housing surface of the first element (2) with a honeycomb structure, and at least some of the fastening elements (15) are connected with tamarapalli (4; 5).

3. The device under item 1 or 2, characterized in that tamarapalli (4; 5) has the shape of a shell.

4. The device according to PP.1, 2 or 3, characterized in that two spaced apart from each other at a certain distance and consecutive takarasiennes (4; 5) form at least part of the surface of the first casing element (2) with a honeycomb structure, and each fixing element (15) connected to only one tamarapalli (4; 5).

5. Device according to one or more paragraphs.1 to 4, characterized in that each fastening element (15) is connected with the internal Trou who eat what is common tubular casing (1) has at least one encircling the inner corrugation (16) adjacent to the inner tubular casing (14) of the second element (3) with a honeycomb structure.

7. The device according to p. 6, characterized in that the inner corrugation (16) is made by knurling.

8. The device according to p. 6, characterized in that the inner corrugation (16) are made radial forging hood.

9. The device according to p. 6, characterized in that the inner tubular casing (14) of the second element (3) with a honeycomb structure in the area of the inner corrugation (16) is connected to a common tubular casing (1).

10. The device according to p. 9, characterized in that the inner tubular casing (14) of the second element with a honeycomb structure in the area of the inner corrugation (16) is connected to a common tubular casing (1) with the power circuit.

11. The device according to p. 9, characterized in that the inner tubular casing (14) of the second element (3) with a honeycomb structure in the area of the inner corrugation (16) is connected to a common tubular casing (1) by soldering.

12. The device according to p. 9, characterized in that the tubular casing (14) of the second element (3) with a honeycomb structure in the area of the inner corrugation (16) is connected with the General trubal the/or the fastening element (12; 15) includes a pin (19) and the first (17) and second (18) liner covering the respective end sections of the pin (19), and between the sleeves (17; 18) and a pin (19) is provided an insulating layer (20; 21).

14. The device according to p. 13, characterized in that each end surface of the pin (19) applied electrically insulating layer.

15. The device according to p. 13, characterized in that each end surface of each of the supporting and/or mounting element (12; 15) applied electrically insulating layer.

 

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