JPH0410903Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has a multi-layer structure in which the casing is sequentially bordered and has a corrugated shape, and the corrugated shape forms a flow path in a casing through which exhaust gas passes. It is placed,
The present invention relates to a filling matrix for a catalytic reactor, in particular for purifying exhaust gases in internal combustion engines, consisting of a metal plate which can be coated with a catalyst on its surface, ie a layer of catalytic material can be formed thereon.

[Conventional technology]

Filling matrices, such as the one shown in the heading, are known (see German Patent Application No. No. 2733640). To prevent slippage between the wound layers, the adjacent layers are formed with protrusions and/or depressions to engage each other.

[Problem that the invention attempts to solve]

The above-mentioned disadvantage of the conventional filling matrix is that the flow channels extend approximately in the axial direction of the casing, so even if openings are provided in the corrugated and smooth plates to secure the wound layers to each other, as is known in the art, It is not possible to equalize the exhaust gas radially as it flows through the matrix. Since the flow resistance is extremely small in the axial flow path, less exhaust gas flows into the adjacent flow path due to turbulence phenomena. This can be achieved by a structure in which two corrugated plates each having a ladder-shaped wave cross section are wound together, or a matrix structure in which similar metal strips are wound in layers (German Patent Application Publication No. 2902779).
The same applies to If the known somewhat parabolic flow profile upon entry into the reactor is not equalized in the radial direction, the result is that no or only insufficient reaction takes place in the marginal region of the matrix. Therefore,
The structural length of the filling matrix must be set relatively long.

The aim of the invention is therefore to promote an equalization of the flow profile and to reduce the structural length so that the contact surfaces can be utilized more effectively.

[Means for solving problems]

According to the invention, in the filling matrix as shown in the header, each channel is constituted by a plurality of corrugated portions which are one after the other in the flow direction and offset from each other in a direction transverse to the flow direction. With this arrangement, the exhaust gases flowing through the housing are forced to change direction in the individual layers in short flow sections. Since the upper and lower layers are constructed similarly, this direction change can be carried out both upwards and downwards, and therefore using corrugated plates with the wide surface necessary for the reaction in relation to the configuration of the flow profile. However, unlike the known configuration, an equalization effect can be obtained as if grids were stacked alternately to equalize the flow. Therefore, in the configuration of the present invention, the turbulence effect is also increased in the radial direction in the casing through which the exhaust gases pass, and the flow profile is equalized and extends to the edge area of the filling matrix, so that this edge area also participates in the reaction. This increases the responsiveness of the matrix. Therefore, the filled matrix of the present invention does not require a long construction like known matrices.

The corrugated portions are configured as corrugated strips of the same configuration extending in a direction transverse to the flow direction, and each strip is configured laterally by a partial length of the wavelength and/or longitudinally by a partial width of the width of the corrugated ribbon. It is preferable that they be arranged with their positions shifted from each other in the direction. The width of the corrugated plates measured in the machine direction may vary, at least for some of the corrugated plates;
The so-called turbulent flow wall is constructed such that the corrugated plates are directly in contact with each other at the front and rear ends in the direction crossing the flow direction, or are connected integrally and are provided between two heat exchange catalyst flow walls in a heat exchanger. It is highly preferable that the configuration corresponds to a part of . Such a turbulent flow plate can be manufactured by using a roll or the like, and can be provided with necessary irregularities.

In order to achieve the effect of the present invention by stacking such turbulent flow plates, the waves of the corrugated plates must be made such that the ``peaks'' bordering the ``valley'' of the adjacent layer are wider than the ``valley''. must be configured. This means that each corrugated plate has a wave with a trapezoidal cross-section, the narrow part of which opens into the adjacent layer.
This can be achieved extremely easily by configuring the structure to form a "trough". Such a plate having an inverted trapezoid cross section is first rolled into a corrugated plate having a rectangular cross section, and then the plate is compressed to obtain the trapezoidal cross section. If you wind up such a corrugated plate,
Differences in the diameter of the individual layers cause differences in deformation, but especially when using a corrugated board with a trapezoidal cross section, at least the crests of the waves correspond to the crests of the waves of the opposing layer below. Since they are in contact, the wound layers will not fit into each other. It goes without saying that it is also possible to form a filling matrix by horizontally stacking corrugated or turbulent plates according to the invention. The filling matrix constructed in this way can be soldered or welded in a known manner and then coated with a catalyst.

Another way to prevent individual layers from interdigitating is to tilt the layers that border each other with respect to the flow direction so that the flow channel portions of two adjacent layers are oriented with respect to each other. preferable. This reliably prevents interlocking of two adjacent layers, as already mentioned, while also resulting in an increased turbulence effect and an evenization of the flow profile. The flow channel portions of each layer may be configured to form an acute angle with respect to the flow direction, and the flow channel portions of adjacent layers may be oriented in opposite directions with respect to the flow direction of the matrix. A strip plate having flow path portions offset at the front and rear ends, which are arranged in a direction crossing the flow direction, can be manufactured by diagonally rolling or stamping a corresponding plate.

[Embodiments] The present invention will be described below based on embodiments shown in the accompanying drawings.

Figures 1, 2, 3a and 3b schematically illustrate the basic structure of the matrix of the present invention. As is clear from FIG. 1, in this embodiment, there are no conventional through channels in any layer in the cylindrical casing wall 1, and the channels are arranged sequentially in the flow direction 2. It consists of a plurality of corrugated bands 3, 4, 5, 6, 7, 8, etc. that extend in the direction crossing the flow direction, and among them, all the corrugated bands 3, 4, 6, and 7 have the same structure. In contrast, the corrugated bands 5 and 8 have a wider width in the flow direction than the other corrugated bands. In each layer, all corrugated bands 3 to 8 have the same length, but are offset from each other by 1/4 of a wavelength a in a direction transverse to the flow direction 2, as is clear from FIG.
Therefore, as is clear from FIGS. 1 and 2, each flow path forming portion 9, 9' has the same length in the flow direction,
The respective vertical walls 9a, 9a' are offset from each other so as to be located in the center of the preceding and succeeding channel forming portions, respectively. Since these vertical walls, together with the bottom wall arranged with them, form upwardly opening channel sections, the first channel section is downwardly opening, so that the channel forming sections 9, 9' In addition to the flow direction 2, as is clear from Figures 3a and 3b,
It is also connected in the direction perpendicular to the flow direction, that is, in the case of this embodiment, also in the radial direction. Arrow 10 indicating the flow shown in Figure 1 and Figures 3a and 3b
As is clear from the above, the flow from the channel sections 9, 9' respectively splits once again into two axially following corrugated bands into two sub-flows, but since the flow resistance is the same, the upper and lower layers 11, 12 or 13, or in the case of a concentric circular matrix, also divided into partial flows flowing through radially adjacent layers 14, 15 or 16. As is clear from FIG. 3a, the individual layers 11, 12, 13, each constructed in the manner shown in FIGS. 1 and 2, can be stacked one after the other. Furthermore, as shown in FIG. 3b, the plates having the basic structure shown in FIGS. 1 and 2 can be arranged in the same circular matrix. This matrix configuration is also shown in FIGS. 4 and 5.

The matrix according to the invention has a shape which makes it possible to radially equalize the incoming flow in the direction of arrow 2 in a very simple manner.

The exhaust gas supplied from the inlet pipe 17 therefore has an inlet profile 18 as shown schematically, but by the time it leaves the casing 1 it has an equalized flow profile 19 due to the configuration of the matrix. This equalization takes place relatively quickly, so that the edge areas of the casing wall 1, which would normally not take part in the reaction in the known reactor, can take part in the conversion process with this new configuration. The matrix and the reactor can therefore be constructed shorter in the flow direction 2.

FIG. 4 shows the flow channels as schematically shown in FIGS. 1 and 2 in individual layers 11, 1 as shown in FIGS. 4 and 5.
A preferred embodiment is shown in which each 2, 13 or 14, 15, 16 continuous strip 20 is formed. An individual strip metal sheet 20 as shown in FIG. It can be manufactured by processing to obtain the basic shape shown in Figure 4. By compression processing, a trapezoidal cross-sectional shape of the strip plate 20 is obtained, and this cross-sectional shape is such that the troughs 26 of the channel portions 9, 9' that are open toward the adjacent layer are closed to the closed peaks 25 on the side of the adjacent layer 11 or 12. It is advantageous in that it is wider in the direction intersecting the flow direction 2 than the flow direction 2. That is, it is possible to stack the strip plates as shown in FIG. 4 without having to fit them into each other. This is 1
The same is true when one or two strips are spirally wound together to form a cylindrical matrix as shown in FIG.

FIG. 6 basically has the same configuration as the strip plate 20 in FIG. 4, but as shown in FIG. 5 and two strip-shaped metal plates 21 and 21a arranged alternately. The strips 21, 21a are at an angle α to the wall 9a of the channel section 9, 9', i.e.
The difference from the case in FIG. 4 is that the cuts are made at angles α in opposite directions with respect to the flow direction 2. The angle α can be set to 5°, for example. By stacking the metal strips 21 and 21a constructed in this manner as shown in FIGS. 3a and 4, a double layer 22 having the construction shown in the lower part of FIG. 6 is obtained. A plurality of such bilayers can be stacked horizontally one after the other or rolled up as shown in FIGS. 3b and 5 to form a matrix. In a matrix constructed in this manner, it is not necessary to make the cross-sectional shape of the corrugations trapezoidal as shown in FIGS. 4 and 5 in order to prevent two adjacent metal strips from fitting into each other. The band-shaped metal plates 21 and 21a are formed of a wave-shaped band piece 3 having an arbitrary waveform, for example, the waveform shown in FIG.
4 or 5, and the waveform may be a waveform close to a sine wave. individual channel sections 9 of adjacent layers;
By slanting 9' to each other, there is no risk that two mutually adjacent layers will fit into each other.

In FIG. 2, the corrugated strips 3, 4 each have the same configuration and are laterally offset from each other by 1/4 of the wavelength a. This deviation is not 1/4, but a/3,
It may be a/5, a/6, etc. In particular, when it is part of a spiral plate as shown in Figure 4, the overlapping corrugated plates are offset from each other in the transverse direction by a partial length of the wavelength and the partial length of the width b of the corrugated plate (Fig. 2) is They may also be offset from each other in the flow direction 2 by an amount. This is advantageous in that overlapping plates can be prevented from fitting into each other even when the corrugated plates do not have an inverted trapezoid cross section as shown in FIGS. 4 and 5.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal cross-sectional view of a cylindrical reactor according to the invention, with the flow direction being in principle the axial direction of the reactor; FIG. 2 is a flow path in one layer of the reactor shown in FIG. Figures 3a and 3b are respectively a perspective view illustrating the division of the reactor of layered plates (Figure 3a) and a reactor of rolled plates (Figure 3b) into the reactor of Figure 1. 4 is a detailed perspective view showing two layers of superimposed metal plates constructed according to the invention; FIG. FIG. 6 schematically shows two metal plate layers constructed in accordance with the invention and placed one on top of the other and with their channel portions forming an angle to the flow direction. It is a diagram. In the figure, 1... Casing (wall), 2... Flow direction, 3, 4, 5, 6, 7, 8... Corrugated plate, 9,
9′...Flow path portion, 11, 12, 13, 14, 1
5, 16...layer, 17...introduction tube, and 20...
...It is a metal strip plate.

Claims (1)

[Claims for Utility Model Registration] 1. A matrix for a catalytic reactor for purifying exhaust gas of an internal combustion engine, comprising a plurality of plate-shaped metal strips having surfaces coated with a catalytic material, the metal strips comprising: The metal strip has a corrugated press-formed portion whose upper and lower surfaces are in contact with each other to form a plurality of layers, and the metal strip is arranged in a casing through which exhaust gas flows, and the corrugated portion are arranged so as to form flow passages that are continuous in the flow direction but mutually displaced laterally with respect to the flow direction, and the flow passages have alternating peaks 25 and valleys 26. are formed by corrugated bands 3 to 8 having in the direction of flow 2, which are directly joined at leading and trailing edges extending transversely with respect to the flow direction 2, and which
~8 are mutually shifted by a length less than the wavelength a, and are continuous waveform bands 20 in a coil shape.
A matrix for a catalytic reactor for purifying exhaust gas of an internal combustion engine, characterized by comprising: 2 In claim 1 of utility model registration, part of the waveform bands 3 and 4 have the same form, but the other parts 5 and 8 have the same wavelength, but are different from the circulating parts 9 and 9'. A matrix for a catalytic reactor for exhaust gas purification of an internal combustion engine, characterized in that its length in the direction of flow 2 increases. 3 In the device according to claim 1 or 2 of the utility model registration, the waveforms of the waveform bands 3 to 8 are such that the crests 25 of each waveform are in the layer 1 adjacent to the ridges 25.
A matrix for a catalytic reactor for exhaust gas purification of an internal combustion engine, characterized in that the troughs 25 are longer than the adjacent troughs 25 of 1 and 12. 4 In the device described in claim 3 of the utility model registration, each of the corrugations of the corrugated band 20 has a trapezoidal cross-sectional shape, and the narrow portion of the trapezoidal cross-sectional shape is a valley portion that opens to the adjacent layers 11 and 12. A matrix for a catalytic reactor for purifying exhaust gas of an internal combustion engine. 5. In the device according to any one of claims 1 to 4, the flow sections 9, 9' formed in the corrugated bands 3 to 8 are arranged at an angle with respect to the adjacent layers and the supply flow direction 2. Catalytic reactor matrix for exhaust gas purification of internal combustion engines located at α. 6 In the device according to claim 5 of the utility model registration, the flow passage portions 9, 9' are arranged at an angle α in the direction opposite to the adjacent layers 21, 21a with respect to the supply flow direction 2. Catalytic reactor matrix for exhaust gas purification.