WO2015115256A1

WO2015115256A1 - Heat exchanger

Info

Publication number: WO2015115256A1
Application number: PCT/JP2015/051446
Authority: WO
Inventors: 真大石; 高木　俊; 祥啓古賀; 久保　修一
Original assignee: イビデン株式会社
Priority date: 2014-01-28
Filing date: 2015-01-21
Publication date: 2015-08-06
Also published as: JP2015140959A

Abstract

Provided is a heat exchanger that uses a honeycomb structure for which a new function can be imparted to the honeycomb structure, and the flow of a new fluid can be handled. This heat exchanger (1000) has a first end surface (11), a second end surface (12), a first side wall (21), and a second side wall (22), and has multiple flow paths (60) extending from the first end surface (11) to the second end surface (12) and partitioned by inner walls (50). Connecting holes (30) have a first aperture (31), which is formed in the first side wall (21) or the second side wall (22), and a second aperture (32), which is formed in multiple inner walls (50) opposing the first apertures (31), and connects multiple flow paths (60). The flow paths (60) having a first aperture (31) or a second aperture (32) have a sealed part (70) on the first end surface (11) and the second end surface (12) respectively, thereby forming first spaces (41). The other flow paths (60) form second spaces (42) extending from the first end surface (11) to the second end surface (12). The first spaces (41) and the second spaces (42) are isolated from each other by the inner walls (50). A catalyst layer (43) is supported on the inner surface of the first spaces (41) or the second spaces (42), thereby imparting a function of purifying harmful gases included in an exhaust gas.

Description

Heat exchanger

The present invention relates to a heat exchanger using a ceramic honeycomb structure.

The honeycomb structure is composed of a large number of flow paths that are partitioned by inner walls. When a fluid passes through the flow path of the honeycomb structure, heat, a substance, and the like can be moved through the inner wall, so that it is widely used as a heat exchanger.

Among them, ceramic honeycomb structures are excellent in heat resistance and chemical stability, and are therefore used in heat exchangers used under high temperature and corrosive environments.
Patent Document 1 is a high-temperature heat exchanger including an element made of a porous silicon carbide sintered body that exchanges heat between a fluid flowing through the inside and a fluid existing outside. A high temperature heat exchanger is described in which the element is a honeycomb structure having a plurality of cells extending in the longitudinal direction. It is described that a heat exchanger using such a honeycomb structure is excellent in strength and can efficiently exchange heat between fluids having different temperatures.

JP-A-6-345555

The ceramic is used in the honeycomb structure because the atoms constituting the material are strongly bonded by a covalent bond and have high strength, heat resistance, and corrosion resistance. On the other hand, the ceramic material becomes a hard and brittle material due to such a feature of the covalent bond.
For this reason, the ceramic honeycomb structure is manufactured by a simple forming method such as extrusion, and has a simple shape in which flow paths are arranged in one direction. Because of this shape, the parts to which the honeycomb structure is applied are designed on the assumption that the flow paths are aligned in one direction, and the degree of freedom in designing a heat exchanger using the honeycomb structure is small.

In the present invention, there is provided a honeycomb structure that exceeds the scope of application of a heat exchanger using such a conventional honeycomb structure made of ceramic, gives a new function to the honeycomb structure, and can handle a new fluid flow. It aims at providing the used heat exchanger.

The heat exchanger of the present invention for solving the above-mentioned problems has at least a first end face, a second end face, a first side wall, and a second side wall, and is partitioned by an inner wall from the first end face to the second end face. In a heat exchanger using a ceramic honeycomb structure having a plurality of flow paths extending, a first opening formed in the first side wall or the second side wall, and a plurality of faces facing the first opening A connection hole formed on the inner wall and connecting a plurality of the flow paths, and the flow path having the first opening or the second opening includes the first end surface and the second flow path. Each of the second end faces has a sealing portion, and the flow path having the first opening or the second opening constitutes a first space by being connected by the connection hole, and the first opening And the flow path without the second opening is A second space extending from the first end surface to the second end surface is formed, and the first space and the second space are separated from each other by the inner wall, and the first space or the A catalyst layer is provided on the inner surface of the second space.

In the heat exchanger of the present invention, the flow path extends from the first end face toward the second end face. Moreover, the side surface of the honeycomb structure has a first side wall and a second side wall, and the second side wall is located opposite to the first side wall.

According to the heat exchanger using the honeycomb structure of the present invention, unlike the conventional honeycomb structure in which the flow path extends in one direction, a fluid flow can be created in the direction across the honeycomb structure. Further, in such a honeycomb structure, since the first opening and the second opening are formed inside the first opening, not only the flow path located on the outermost periphery but also the flow path on the inner side. A fluid flow can be created. In addition, since the second opening is formed at a position facing the first opening, the fluid can be moved to the flow path inside the second opening in the shortest distance, and the fluid flows efficiently. A heat exchanger can be provided.

In addition, since the heat exchanger of the present invention is made of ceramic and has heat resistance and corrosion resistance and high strength, it can handle a fluid even in a severe environment such as a high temperature environment or a corrosive environment.
Furthermore, in the heat exchanger according to the present invention, the first space has the sealing portions on the first end surface and the second end surface, respectively, so that the fluid from the first end surface and the second end surface side is in the first space. Intrusion can be prevented. Furthermore, since the first space is separated from the second space by the inner wall, the fluid flowing in the first space (first fluid) and the fluid flowing in the second space (second fluid) are in direct contact with each other. Absent. For this reason, functions, such as heat transfer and filtration, can be held in the inner wall.

Further, since the catalyst layer is provided on the inner surface of the first space or the second space, a function of purifying harmful gas contained in the exhaust gas can be provided. Furthermore, it is possible to provide a function of efficiently purifying harmful gas by heating the exhaust gas having a low temperature by heat exchange.

Furthermore, it is desirable that the heat exchanger of the present invention has the following aspect.
(1) The heat exchanger has a plurality of the connection holes.
Since the heat exchanger of the present invention has a plurality of connection holes, a larger amount of fluid can flow in the direction crossing the flow path of the honeycomb structure.

(2) The connection holes are alternately formed in the plurality of flow paths facing the first side wall or the second side wall.
In the heat exchanger according to the present invention, the connection holes are alternately formed in the plurality of flow paths facing the first side wall or the second side wall, whereby the flow in the direction crossing the flow path of the honeycomb structure is performed. Can be placed in alternating flow paths. For this reason, the area of the inner wall separating the fluid flowing along the flow path (second fluid) and the fluid flowing in the direction crossing the flow path (first fluid) can be increased.

(3) The first space has a plurality of the connection holes.
Since the heat exchanger of the present invention has a plurality of connection holes in the first space, the plurality of connection holes can serve as an inlet and an outlet for the fluid flowing in the first space. By providing the inlet and the outlet with a plurality of connection holes in the first space, the fluid flowing through the first space (first fluid) can be used continuously.

Also, having a plurality of connection holes in the first space has an effect of increasing the amount of heat passing through the inner wall. The amount of heat passing through the inner wall that separates the first space and the second space is proportional to the temperature difference between the first space and the second space. By forming a flow from the inlet to the outlet in the fluid flowing through the first space, a new first fluid can be constantly supplied, and a temperature difference can be generated on the inner wall to increase the amount of heat that moves.

(4) The heat exchanger has the connection holes on the first side surface and the second side surface, respectively.
In the heat exchanger of the present invention, the first fluid that connects the inlet and the outlet flows through the same distance by passing through any flow path by having connection holes in the first and second side walls, respectively. it can. For this reason, since the 1st fluid can be spread over the whole inner wall, the heat exchanger which can perform heat transfer or mass transfer efficiently can be provided.

(5) The first opening and the second opening are formed in a slit shape, and the length of the first opening is longer than the length of the second opening.
The heat exchanger of the present invention can efficiently supply fluid from the side of the elongated channel by configuring the first opening and the second opening in a slit shape. Furthermore, by making the first opening larger than the second opening, the resistance of the first fluid in the first opening can be reduced while reducing the influence on the strength reduction of the entire heat exchanger, and the pressure can be reduced. Loss can be reduced efficiently.

(6) The plurality of second openings are longer in order toward the first opening.
The heat exchanger of the present invention is configured such that the second opening becomes longer in order toward the first opening, thereby reducing the influence on the strength reduction of the honeycomb structure, while reducing the influence on the first opening. The resistance of the first fluid can be reduced, and the pressure loss can be reduced more efficiently.

(7) The first opening and the second opening are configured in a slit shape, and the length of the first opening and the length of the plurality of second openings are both equal. And
In the heat exchanger of the present invention, the first opening and the second opening are formed in a slit shape, and the length of the first opening and the lengths of the plurality of second openings are both equal. By configuring in this manner, the volume of the connection hole formed by the first opening and the second opening can be increased. By increasing the volume of the connection hole, the first fluid can be efficiently distributed according to the resistance generated in each flow path connected to the connection hole.

(8) The connection hole is characterized in that the second openings having five or more layers are stacked.
The heat exchanger of the present invention can supply the first fluid to the sixth flow path counted from the first side wall side by stacking the second openings of five layers or more. By adopting such a configuration, the area of the inner wall that separates the first space and the second space can be increased.

(9) The connection hole is characterized in that the second openings of 10 layers or more are stacked.
The heat exchanger of the present invention can supply the first fluid to the eleventh channel counted from the first side wall side by stacking the second openings of 10 layers or more. With such a configuration, the area of the inner wall separating the first space and the second space can be further increased.

(10) The ceramic is characterized by comprising any of silicon carbide, silicon-impregnated silicon carbide, alumina, cordierite, silicon nitride, aluminum nitride, or zirconia.
The heat exchanger of the present invention has heat resistance, corrosion resistance, and high strength when the honeycomb structure is made of any of silicon carbide, silicon-impregnated silicon carbide, alumina, cordierite, silicon nitride, aluminum nitride, or zirconia. Heat exchanger can be provided.

According to the present invention, since the flow of the fluid can be drawn not only in the flow path formed by the inner wall of the honeycomb structure constituting the heat exchanger but also in the direction crossing the flow path, the conventional ceramic honeycomb structure A new function not provided in the heat exchanger using the body can be added. Moreover, since it has a catalyst layer in the inner surface of 1st space or 2nd space, the function which purifies the harmful gas contained in exhaust gas can be provided. Furthermore, it is possible to provide a function of efficiently purifying harmful gas by heating the exhaust gas having a low temperature by heat exchange.

It is a perspective view of the heat exchanger of a 1st embodiment concerning the present invention. (A) is a perspective view of the modification of the heat exchanger of 1st Embodiment which concerns on this invention, (b) is a perspective view of another modification. 2A and 2B are cross-sectional views of the heat exchanger according to the first embodiment of the present invention, in which FIG. 1A is a cross-sectional view taken along the line A-A ′ of FIG. 1, and FIG. (A)-(e) is sectional drawing of the modification of the connection hole of the heat exchanger of 1st Embodiment which concerns on this invention, and is a figure equivalent to Fig.3 (a). (A)-(c) is a perspective view of the modification of the heat exchanger of 1st Embodiment which concerns on this invention. 5A is a cross-sectional view of a modification of the heat exchanger of FIGS. 5A to 5C, FIG. 5A is a cross-sectional view taken along the line CC ′ of FIG. 5A, and FIG. 5B is an E view of FIG. FIG. 5C is a cross-sectional view taken along the line DD ′ in FIG. 5A and the cross-sectional view taken along the line FF ′ in FIG. 5B. (A) is a perspective view of the heat exchanger of 2nd Embodiment which concerns on this invention, (b) is a perspective view of the modification of the heat exchanger of 2nd Embodiment which concerns on this invention. FIGS. 7A to 7C are cross-sectional views of a heat exchanger according to a second embodiment of the present invention, FIG. 7A is a cross-sectional view taken along the line GG ′ of FIG. 7A, and FIG. FIG. 7B is a cross-sectional view taken along the line II ′ of FIG. 7B, and FIG. 7C is a cross-sectional view taken along the line HH ′ of FIG. (A) And (b) is explanatory drawing which shows an example of the manufacturing method of the connection hole of the heat exchanger which concerns on this invention. It is explanatory drawing which shows another example of the manufacturing method of the connection hole of the heat exchanger which concerns on this invention. (A) And (b) is process drawing which shows an example of the manufacturing method of the connection hole of the heat exchanger which concerns on this invention. (A) And (b) is process drawing which shows another example of the manufacturing method of the connection hole of the heat exchanger which concerns on this invention. It is explanatory drawing which shows an example of the method of manufacturing the connection hole of the heat exchanger which concerns on this invention with a laser beam, (a) is the case where the light-transmitting stick | rod which has a curved surface in the flow path is inserted (B) shows the case where devitrified glass is inserted in the flow path, and (c) shows the case where water is put in the flow path. It is explanatory drawing which shows an example of the method of manufacturing the connection hole of the heat exchanger using the honeycomb structure which concerns on this invention with the laser beam guided by the water flow (water jet), (a) is in a flow path. When a light-transmitting rod having a curved surface is inserted, (b) is when devitrified glass is inserted in the flow path, and (c) is when water is put in the flow path. is there. (A) is the external appearance photograph of the heat exchanger using the honeycomb structure of the Example which concerns on this invention, (b) is the explanatory drawing. (A) is the cross-sectional photograph of the connection hole of the heat exchanger using the honeycomb structure of the Example which concerns on this invention, (b) is the explanatory drawing. It is explanatory drawing which shows the cutting position and cutting direction of FIG. 3 which are sectional drawings of FIG. 1 in detail. It is a perspective view of the heat exchanger of 3rd Embodiment which concerns on this invention. FIG. 19 is a cross-sectional view of a heat exchanger according to a third embodiment of the present invention, where (a) is a KK ′ cross-sectional view of FIG. 18 and (b) is a LL ′ cross-sectional view of FIG. 18 (b). . It is a perspective view of the heat exchanger of 4th Embodiment which concerns on this invention. FIG. 21 is a cross-sectional view of a heat exchanger according to a fourth embodiment of the present invention, where (a) is a KK ′ cross-sectional view of FIG. 20 and (b) is a LL ′ cross-sectional view of FIG. 20 (b). . It is a perspective view of the heat exchanger of 5th Embodiment which concerns on this invention. FIG. 23 is a cross-sectional view of a heat exchanger according to a fifth embodiment of the present invention, where (a) is a KK ′ cross-sectional view of FIG. 22 and (b) is a LL ′ cross-sectional view of FIG. 22 (b). .

In the present specification, the cross section of the honeycomb structure indicates a cross section cut in the depth direction of the connection hole along the flow path. For example, FIG. 17 describes in detail the cutting position of FIG. 3, which is a cross-sectional view of FIG. 4 is a sectional view of FIG. 1, FIG. 6 is a sectional view of FIG. 5, and FIG. 8 is a sectional view of FIG.
The pattern and size of the honeycomb of the heat exchanger of the present invention are not particularly limited. In the present embodiment, a heat exchanger using a honeycomb structure having an 8 × 8 lattice flow path has been described. For example, a hexagonal flow path honeycomb, a combination of octagonal and quadrangular flow paths is used. The honeycomb is not particularly limited.

The shape of the heat exchanger of the present invention is not particularly limited. Other cylinders such as hexahedrons and hexagonal cylinders can also be applied. In the case of a cylinder, a region where a group of connection holes are formed in the side surface can be defined as a first side wall, and a region on the opposite side can be defined as a second side wall.

The heat exchanger of the present invention has at least a first end surface, a second end surface, a first side wall, and a second side wall, and has a plurality of flow paths partitioned by an inner wall and extending from the first end surface to the second end surface. In a heat exchanger using a ceramic honeycomb structure, a plurality of first openings formed in the first side wall or the second side wall and a plurality of inner walls facing the first opening are formed. A connection hole comprising a second opening for connecting the flow path, and the flow path having the first opening or the second opening is sealed to the first end face and the second end face, respectively. The flow path having the first opening or the second opening constitutes a first space by being connected by the connection hole, and the first opening and the second opening The flow path without an opening is formed from the first end surface to the first flow path. A second space extending to an end surface is formed, and the first space and the second space are separated from each other by the inner wall, and a catalyst is formed on the inner surface of the first space or the second space. Has a layer.

In the honeycomb structure of the heat exchanger of the present invention, the flow path extends from the first end face toward the second end face. Moreover, the side surface of the honeycomb structure has a first side wall and a second side wall, and the second side wall is located opposite to the first side wall.

According to the heat exchanger of the present invention, unlike the conventional honeycomb structure in which the flow path extends in one direction, a fluid flow can be created in the direction across the honeycomb structure. In addition, since such a heat exchanger has the first opening and the second opening formed inside the first opening, not only the flow path located on the outermost periphery but also the inner flow path. A fluid flow can be created. In addition, since the second opening is formed at a position facing the first opening, the fluid can be moved to the flow path inside the second opening in the shortest distance, and the fluid flows efficiently. A honeycomb structure that can be provided can be provided.

Furthermore, since the heat exchanger of the present invention is made of ceramic and has heat resistance and corrosion resistance and high strength, the fluid can be handled even in a severe environment such as a high temperature environment or a corrosive environment.
Moreover, since it has a catalyst layer in the inner surface of 1st space or 2nd space, the function to purify the noxious gas contained in exhaust gas can be provided. Furthermore, it is possible to provide a function of efficiently purifying harmful gas by heating the exhaust gas having a low temperature by heat exchange.

In the heat exchanger according to the present invention, the first space has sealing portions on the first end surface and the second end surface, respectively, so that the fluid enters the first space from the first end surface and the second end surface side. Can be prevented. Furthermore, since the first space is separated from the second space by the inner wall, the fluid flowing in the first space (first fluid) and the fluid flowing in the second space (second fluid) are in direct contact with each other. Absent. For this reason, functions, such as heat transfer and filtration, can be held in the inner wall.

In the heat exchanger of the present invention, it is preferable that the heat exchanger has a plurality of the connection holes.
Since the heat exchanger of the present invention has a plurality of connection holes, a larger amount of fluid can flow in the direction crossing the flow path of the honeycomb structure.

In the heat exchanger according to the present invention, it is preferable that the connection holes are alternately formed in the plurality of flow paths facing the first side wall or the second side wall.
In the heat exchanger according to the present invention, the connection holes are alternately formed in the plurality of flow paths facing the first side wall or the second side wall, whereby the flow in the direction crossing the flow path of the honeycomb structure is performed. Can be placed in alternating flow paths. For this reason, the area of the inner wall separating the fluid flowing along the flow path (second fluid) and the fluid flowing in the direction crossing the flow path (first fluid) can be increased.

In the heat exchanger according to the present invention, it is preferable that the first space has a plurality of the connection holes.
Since the heat exchanger of the present invention has a plurality of connection holes in the first space, the plurality of connection holes can serve as an inlet and an outlet for the fluid flowing in the first space. By providing an inlet and an outlet with a plurality of connection holes in the first space, the fluid (first fluid) flowing through the first space can be continuously supplied.

The heat exchanger of the present invention preferably has the connection holes on the first side surface and the second side surface, respectively.
In the heat exchanger of the present invention, the first fluid that connects the inlet and the outlet flows through the same distance by passing through any flow path by having connection holes in the first and second side walls, respectively. it can. For this reason, since the first fluid can be spread over the entire inner wall, it is possible to provide a honeycomb structure capable of efficiently performing heat transfer or mass transfer.

In the heat exchanger according to the present invention, it is preferable that the first opening and the second opening are formed in a slit shape, and the length of the first opening is longer than the length of the second opening. .
The heat exchanger of the present invention can efficiently supply fluid from the side of the elongated channel by configuring the first opening and the second opening in a slit shape. Furthermore, by making the first opening larger than the second opening, it is possible to reduce the resistance of the first fluid in the first opening while reducing the influence on the strength reduction of the entire honeycomb structure, Pressure loss can be reduced efficiently.
In the present specification, the length of the opening is the length in the direction of the flow path.

In the heat exchanger according to the present invention, it is preferable that the plurality of second openings become longer in order toward the first opening.
The heat exchanger of the present invention is configured such that the second opening becomes longer in order toward the first opening, thereby reducing the influence on the strength reduction of the honeycomb structure, while reducing the influence on the first opening. The resistance of the first fluid can be reduced, and the pressure loss can be reduced more efficiently.

In the heat exchanger of the present invention, the first opening and the second opening are configured in a slit shape, and the length of the first opening and the length of the plurality of second openings are any Are also preferably equal.
In the heat exchanger of the present invention, the first opening and the second opening are formed in a slit shape, and the length of the first opening and the lengths of the plurality of second openings are both equal. By configuring in this manner, the volume of the connection hole formed by the first opening and the second opening can be increased. By increasing the volume of the connection hole, the first fluid can be efficiently distributed according to the resistance generated in each flow path connected to the connection hole.

In the heat exchanger according to the present invention, it is preferable that the connection holes have the second openings of five layers or more stacked.
The heat exchanger of the present invention can supply the first fluid to the sixth flow path counted from the first side wall side by stacking the second openings of five layers or more. By adopting such a configuration, the area of the inner wall that separates the first space and the second space can be increased.
In addition, the aspect ratio between the diameter or width and depth of the connection hole formed by stacking the second openings of five layers or more is 6 or more if the channel is a square channel, and the channel in the deep position is connected to the connection hole. Can be connected.

In the heat exchanger according to the present invention, it is preferable that the connection hole has the second openings of 10 layers or more stacked.
The heat exchanger of the present invention can supply the first fluid to the eleventh channel counted from the first side wall side by stacking the second openings of 10 layers or more. With such a configuration, the area of the inner wall separating the first space and the second space can be further increased.
In addition, the aspect ratio of the diameter or width and depth of the connection hole formed by stacking the second openings of 10 layers or more is 11 or more in the case of a square channel, and a channel at a deeper position is connected. Can be connected with holes.

In the heat exchanger of the present invention, the ceramic is preferably made of any of silicon carbide, silicon-impregnated silicon carbide, alumina, cordierite, silicon nitride, aluminum nitride, or zirconia.
The heat exchanger according to the present invention is made of any one of silicon carbide, silicon-impregnated silicon carbide, alumina, cordierite, silicon nitride, aluminum nitride, or zirconia, so that it has heat resistance and corrosion resistance and has a high strength honeycomb structure. Can be provided.
When used in a heat exchanger, it is desirable to use silicon carbide, silicon carbide impregnated with silicon, aluminum nitride, or silicon nitride. These ceramics have high thermal conductivity and are suitable as heat exchangers.

The heat exchanger of the present invention can be obtained by forming connection holes in the first side wall or the second side wall of the honeycomb-shaped ceramic. It can be obtained by forming the first and second openings. Connection holes can be formed in the honeycomb-shaped ceramic on the first side wall or the second side wall by laser processing. The laser processing machine used for laser processing is not particularly limited. A honeycomb-shaped ceramic can be processed by using a widely used high-power laser beam. The wavelength and output of the laser beam of the laser processing machine can be appropriately selected according to the honeycomb ceramic.
Further, it is possible to perform processing more efficiently by using a laser processing machine combined with a water flow of a water jet that has recently been used. The laser processing method combined with the water jet water flow guides the laser light into the water jet water flow and can guide it to the processing point while totally reflecting it, so that the laser light passes through a thin water flow without diffusing. The depth of focus is deep, and it has higher processing performance than a processing machine using only laser light.

The heat exchanger of the present invention can be obtained by processing without penetrating the bottom of the connection hole by using a laser processing machine combined with a water flow of a high processing performance water jet.
Processing while leaving the bottom of the connection hole can be realized by scattering laser light at a predetermined location and dispersing light energy. By inserting the light diffusing medium at a predetermined location, the laser light is weakened below and cannot be processed. The light diffusion medium is not particularly limited as long as light can be dispersed. For example, a light-transmitting rod having a curved surface such as a glass rod, devitrified glass, glass having bubbles inside, water, and the like can be used. A light-transmitting substance is not heated by laser light, and light is scattered on a curved surface, so that the ability to process laser light can be reduced, and the bottom of the connection hole can be formed without penetrating. Can be processed.

In addition, devitrified glass has a phase-separated interior even if the surface is not curved, so that light is easily scattered, the ability to process laser light can be reduced, and the bottom is formed without penetrating. be able to. Moreover, it can process by leaving the bottom of a connection hole by filling water in a predetermined location. When filled with water, a large amount of bubbles are generated by boiling water heated by mixing and processing with a water jet stream. For this reason, the laser beam is rapidly attenuated in the filled water, and processing can be performed while leaving the bottom of the connection hole. Even when water is not filled, water is supplied by the water flow along with the laser light, but the amount of water used for the water flow is small and the laser light scatters quickly near the place where the ceramic is processed (processing point). As the laser beam is weakened, bubbles cannot be formed in the section.

The heat exchanger of the present invention can be processed by tilting or scanning the laser beam according to the shape, although there are various modifications of the connection holes.

Further, when processing while scanning with laser light, the connection hole having a desired shape can be formed by appropriately changing the length of the light diffusion medium inserted into each flow path.
The sealing part of the heat exchanger of the present invention may be formed in any way and is not particularly limited. For example, a plug made of the same ceramic material as that constituting the inner wall may be inserted. For example, when the honeycomb structure is made of silicon carbide, silicon nitride, or silicon carbide impregnated with silicon, silicon powder may be applied to the plug as an adhesive and then fired. Silicon melts and functions as an adhesive.
Further, for example, it can be obtained by injecting and baking a paste in which an inorganic binder, an organic binder, and inorganic particles are mixed. As the inorganic binder, alumina sol, silica sol or the like can be used. As the organic binder, polyvinyl alcohol, phenol resin or the like can be used. As the inorganic particles, silicon carbide, alumina, cordierite, silicon nitride, aluminum nitride, zirconia or the like can be used.

Next, an embodiment of the present invention will be described.
In the first embodiment and the second embodiment, a honeycomb structure before mainly forming a catalyst layer will be described.

The first embodiment has a sealing portion on the first end surface and the second end surface of the flow path constituting the first space, and a connection hole is formed on the first side wall to constitute the first space. It is a heat exchanger with which the 1st end surface and 2nd end surface of 2 space are open | released.

2nd Embodiment is a heat exchanger of the following forms.
Connection holes are alternately formed in the plurality of channels facing the first side wall, and the bottoms of the connection holes reach the second end surface. The connection hole does not penetrate the second end face. The first end face and the second end face of the flow path having the first opening and the second opening each have a sealing portion, thereby constituting a first space.
The flow path without the first opening and the second opening constitutes a second space extending from the first end surface to the second end surface, and the first space and the second space are separated from each other by the inner wall. . The first space has connection holes on the first and second side walls. Four independent spaces constitute the first space, and 32 4 × 8 independent flow paths constitute the second space.

The third to fifth embodiments are heat exchangers having a catalyst layer on the inner surface of the first space or the second space.

<First Embodiment>
The heat exchanger of 1st Embodiment is demonstrated using a figure.
FIG. 1 is a perspective view of a heat exchanger according to a first embodiment of the present invention. FIG. 2 is a perspective view of a modification of the heat exchanger according to the first embodiment of the present invention. 3 is a cross-sectional view of the heat exchanger according to the first embodiment of the present invention. FIG. 3A is a cross-sectional view taken along the line AA ′ in FIG. 1, and FIG. 3B is a cross-sectional view taken along the line BB ′ in FIG. is there. FIG. 4 is a cross-sectional view of a modification of the connection hole of the heat exchanger according to the first embodiment of the present invention. This corresponds to a cross-sectional view taken along the line AA ′ of FIG. FIG. 5 is a perspective view of a modification of the heat exchanger according to the first embodiment of the present invention. 6 is a cross-sectional view of a modification of the heat exchanger of FIG. 5, where (a) is a cross-sectional view along CC ′ in FIG. 5 (a), and (b) is a cross-sectional view along EE ′ in FIG. 5 (b). FIG. 5C is a sectional view taken along the line DD ′ of FIG. 5A and a sectional view taken along the line FF ′ of FIG.

As shown in FIG. 1, the heat exchanger (1000) of the first embodiment includes eight flow paths 60 in contact with the first side wall 21 of the honeycomb structure 1000 (heat exchanger) having 8 × 8 flow paths. Of these, four connection holes 30 are provided alternately. As shown in FIG. 3A, each connection hole 30 includes a first opening 31 formed in the first side wall 21 and a plurality of second openings 32 formed in the inner wall 50. As shown in FIG. 3A, the first opening 31 and the second opening 32 have a slit shape, and the lengths of the first opening 31 and the second opening 32 are the same. As shown in FIG. 3B, the cross section of the row adjacent to the row where the connection hole 30 is formed does not have a hole in the inner wall 50.

The position, shape, and number of the connection holes 30 are not particularly limited. 2 and 5 are modified examples in which the position and surface shape of the connection hole 30 are different. FIG. 2A shows a honeycomb structure 1000 (heat exchanger) having one slit-like connection hole 30, and FIG. 2B shows a part of the channel 60 facing the first side wall 21. A slit-like connection hole 30 is formed. Each connection hole 30 is also formed in a slit shape. FIG. 5A shows that four circular connection holes 30 are alternately arranged among the eight flow paths 60 in contact with the first side wall 21 of the honeycomb structure 1000 having the 8 × 8 flow paths 60. A honeycomb structure 1000 (heat exchanger) is shown. FIG. 5B shows the connection of four groups so as to alternate among the eight channels 60 in contact with the first side wall 21 of the honeycomb structure 1000 (heat exchanger) having 8 × 8 channels. Each group of connection holes 30 includes a hole 30 and is a honeycomb structure 1000 (heat exchanger) including five circular connection holes 30. FIG. 5C shows a honeycomb structure 1000 (heat exchanger) having one circular connection hole 30.

The shape of the connection hole 30 in the depth direction is not particularly limited. FIG. 4 shows a modification of the connection hole 30, is a cross-sectional view of the connection hole 30 in the flow path direction, and shows a cross-section A-A ′ of FIG. 1. FIG. 4A shows a connection hole 30 having a V-shaped cross section. The first opening 31 is longer than the second opening 32, and a plurality of second openings 32 are formed in the first opening 31. It is comprised so that it may become long in order. FIG. 4B shows the connection hole 30 aligned so that one side of the first opening 31 and the second opening 32 is vertical, and the first opening 31 is longer than the second opening 32 and includes a plurality of holes. The second opening 32 is configured to become longer in order toward the first opening 31, and the connection hole 30 has a trapezoidal cross section. FIG. 4C shows a connection hole 30 in which the first opening 31 and the second opening 32 have the same length and penetrate the first side wall 21 and the second side wall 22. FIG. 4D shows the connection hole 30 in which the connection hole 30 is formed from the first side wall 21 and the second side wall 22 and shares the inner wall 50 serving as the bottom. FIG. 4 (e) shows the connection hole 30 that is larger in the inside, the first opening 31 is shorter than the second opening 32, and the plurality of second openings 32 are sequentially directed toward the first opening 31. It is configured to be shorter.

The honeycomb pattern and size of the honeycomb structure 1000 (heat exchanger) are not particularly limited. In the present embodiment, the honeycomb structure 1000 (heat exchanger) having the 8 × 8 lattice-like flow paths 60 has been described. For example, the honeycombs of the hexagonal flow paths 60, the octagonal and the quadrangular flow paths There are no particular limitations such as 60 honeycombs.

The heat exchanger 1000 of this embodiment can be obtained by forming the connection holes 30 in the first side wall 21 or the second side wall 22 of the honeycomb-shaped ceramic. The first opening 31 and the second opening 32 are formed by inserting a light diffusion medium 90 into a flow path 60 facing the second side wall 22 and scanning with laser light 80 as shown in FIG. Can be processed. Depending on the shape of the connection hole 30, the connection hole 30 having a desired shape can be obtained by appropriately changing the insertion length of the light diffusion medium 90 as shown in FIG. In addition, as shown in FIGS. 11 and 12, the connection hole 30 having a desired shape may be obtained by scanning the laser beam 80 while appropriately tilting it.

The heat exchanger 1000 of the present embodiment can be processed by inserting the light diffusion medium 90 and leaving the bottom of the connection hole 30. FIGS. 13 and 14 show how the laser light 80 is diffused by the light diffusion medium 90. FIGS. 13A, 13B, and 13C show only the laser beam 80, and FIGS. 14A, 14B, and 14C show processing by combining the laser beam 80 and the water flow 82. FIGS. . As a processing machine in which the laser beam 80 and the water flow 82 are combined, for example, an MCS300 type laser processing machine manufactured by Makino Milling Co. can be used.

FIGS. 13 (a) and 14 (a) are explanatory views using a glass rod 91 for the light diffusion medium 90, and processing is performed leaving the bottom of the connection hole 30 by diffusion of the laser light 80 by the convex surface of the glass. Can do.
FIG. 13B and FIG. 14B are explanatory diagrams using a devitrified glass 92 for the light diffusion medium 90, and processing is performed by diffusing the laser light 80 by irregular reflection inside the glass and leaving the bottom of the connection hole 30. can do.
FIGS. 13C and 14C are explanatory diagrams in which water 93 is used for the light diffusing medium 90, and the laser light 80 is diffused by heat due to processing and turbulent reflection of bubbles generated by the turbulent flow of the water 93. Processing can be performed leaving the bottom of the connection hole 30.

Second Embodiment
The heat exchanger of 2nd Embodiment is demonstrated using a figure.
In addition, the same code | symbol is attached | subjected to the site | part which is common in the heat exchanger (1000) which concerns on 1st Embodiment mentioned above, and the overlapping description is abbreviate | omitted.
Fig.7 (a) is a perspective view of the heat exchanger of 2nd Embodiment which concerns on this invention. (A) is a perspective view of the modification of the heat exchanger of 2nd Embodiment which concerns on this invention. 8A and 8B are cross-sectional views of the heat exchanger according to the second embodiment of the present invention, in which FIG. 8A is a cross-sectional view taken along the line GG ′ of FIG. 7A, and FIG. FIG. 7C is a cross-sectional view taken along line I-H 'in FIG. 7A and a cross-sectional view taken along line JJ ′ in FIG. 7B.

In the honeycomb structure 1000 (heat exchanger) of the second embodiment, the connection holes 30 are alternately formed in the plurality of flow paths 60 facing the first side wall 21, and the bottom of the connection holes 30 reaches the second side wall 22. Yes. The connection hole 30 does not penetrate the second side wall 22. The first end face 11 and the second end face 12 of the flow path 60 having the first opening 31 and the second opening 32 each have a sealing portion 70, thereby forming a first space 41.

The channel 60 without the first opening 31 and the second opening 32 constitutes a second space 42 extending from the first end surface 11 to the second end surface 12, and the first space 41 and the second space 42. Are separated from each other by an inner wall 50. The first space 41 has a connection hole 30 on the first side wall 21 and the second side wall 22 side. The first space 41 is composed of four independent spaces, and 32 independent 4 × 8 flow paths 60 form the second space 42.
The first space 41 can create a fluid flow from the first side wall 21 to the second side wall 22 (and vice versa). The second space 42 can also create a fluid flow from the first end surface 11 to the second end surface 12 (and vice versa). Since the first space 41 and the second space 42 are separated by the inner wall 50, the amount of heat can be moved through the inner wall 50 without being mixed with each other. This effect can be suitably used as a heat exchanger.

The heat exchanger 1000 of the present embodiment can be processed by inserting the light diffusion medium 90 and leaving the bottom of the connection hole 30. FIGS. 13 and 14 show how the laser light 80 is diffused by the light diffusion medium 90. 13 (a), (b), and (c) show only processing with the laser beam 80, and FIGS. 14 (a), (b), and (c) show processing with the laser beam 80 in combination with a water jet (water flow 82). Show. As a laser processing machine used in combination with a water jet, an MCS300 laser processing machine manufactured by Makino Milling Co. can be used.

In this example, the result of manufacturing the honeycomb structure (heat exchanger) 1000 according to the present invention by forming the connection hole 30 having a trapezoidal cross section in the honeycomb-shaped ceramic actually made of porous silicon carbide, This will be described with reference to FIGS. 15 and 16.
A honeycomb structure (heat exchanger) 1000 according to the present invention is formed using a honeycomb-shaped ceramic made of silicon carbide of 34 mm × 34 mm × 130 mm, having 24 × 24, a total of 576 square channels 60. Produced. In addition, the end surface in the longitudinal direction has a channel opening and is a first end surface 11 and a second end surface 12. The four surfaces other than the first end surface 11 and the second end surface 12 are side walls, of which the surface forming the connection hole 30 is the first side wall 21, and the opposite surface is the second side wall 22. The inner wall 50 has a thickness of 0.25 mm, and the first side wall 21 and the second side wall 22 have a thickness of 0.3 mm. The size of the channel 60 is a square having a side of 1.14 mm.

As shown in FIG. 15, connection holes 30 were formed in this honeycomb-shaped ceramic. By forming the first openings 31 in the twelve channels 60 out of the twenty-four channels 60 facing the first side wall 21 and further forming the

second openings

32, 12 The connection hole 30 was formed. The bottom of the connection hole 30 is the second side wall 22, and the second openings 32 are formed in all the inner walls 50. The distance between the first opening 31 and the second opening 32 and the first end surface 11 is 10 mm, the first opening 31 extends from the first end surface 11 to a position of 40 mm, and the second opening 32 in the lowermost layer is One end surface 11 extends to a position of 25 mm. The second opening 32 becomes longer toward the first opening 31 in order, and the connection hole 30 has a trapezoidal cross section. The width of the first opening 31 is 0.6 mm.

A detailed processing method will be described below. When forming the connection hole 30, a circular glass rod 91 longer than the flow path 60 is inserted into the flow path 60 facing the second side wall 22, and the other flow paths 60 have portions other than the trapezoidal basin. A circular glass rod 91 was inserted up to.
Next, it processed using the MCS300 type | mold laser processing machine by Makino milling company along the flow path 60 which faces the 1st side wall 21. FIG. Processing was performed at a laser wavelength of 532 nm, an output of 80 W, a nozzle diameter of the water flow 82 of φ80 μm, and a scanning speed of 300 mm / min.

The honeycomb structure (heat exchanger) 1000 obtained by processing in this way was cut along the connection holes 30 to confirm the connection holes 30. As shown in FIG. 16, the connection hole 30 had a trapezoidal cross section, the inner wall 50 penetrated all, the first opening 31 had a length of 30 mm, and the lowermost second opening 32 had a length of 15 mm.
Thus, it was confirmed that the connection hole 30 can be formed by a laser processing machine using the water flow 82. The method of forming the connection holes 30 in the honeycomb structure (heat exchanger) 1000 is not limited to the laser beam 80 using the water flow 82, and the water flow 82 is used in combination as long as it takes time and is a high-power laser processing machine. Can be processed without any problems.

Also, the size, arrangement, and number of the connection holes 30 can be selected as appropriate.

<Third Embodiment>
The heat exchanger of 3rd Embodiment is demonstrated using a figure.
In addition, the same code | symbol is attached | subjected to the site | part which is common in the heat exchanger (1000) which concerns on 1st Embodiment mentioned above, and the heat exchanger (1000) which concerns on 2nd Embodiment, and the overlapping description is abbreviate | omitted. To do.
FIG. 18 is a perspective view of a heat exchanger according to a third embodiment of the present invention. 19 is a cross-sectional view of the heat exchanger according to the third embodiment of the present invention. FIG. 19A is a cross-sectional view taken along the line KK ′ of FIG. 18, and FIG. 19B is a cross-sectional view taken along the line LL ′ of FIG. FIG.

As shown in FIGS. 18 and 19A, in the heat exchanger (1000) of the third embodiment, the catalyst layer 43 is provided on the inner surface of the first space 41, and the inner surface of the second space 42 is provided on the inner surface. There is no catalyst layer (see FIG. 19B).
Although it does not specifically limit as a catalyst active component carry | supported by the catalyst layer 43, For example, noble metals, such as Pt, Rh, Pd, Ce, Cu, V, Fe, Au, Ag, etc. are mentioned. Of these, Pt is most preferred. Moreover, although the said noble metal etc. can be used independently, you may use 2 or more types together.
By these catalytically active components, for example, HC and CO contained in the exhaust gas can be purified.

The catalyst layer may be composed of only the catalytically active component, but may be one in which the catalytically active component is supported on the catalyst support material layer. The catalyst support material layer preferably has, for example, a large specific surface area and a function of increasing the contact area between the gas and the catalyst.
The material of the catalyst carrier constituting the catalyst layer and supporting the catalytic active component is not particularly limited, and examples thereof include alumina, titania, silica, ceria, zirconia and the like. Among these, alumina is most preferable from the viewpoint of heat resistance and chemical stability. Among aluminas, γ-alumina has a high specific surface area and can be suitably used as a catalyst support material.
In addition, the heat exchanger 1000 of the present invention may carry a catalytic active component such as an alkali metal or an alkaline earth metal in addition to the catalytic active component as long as the object of the present invention is not impaired. . By using these catalytically active components, NOx contained in the exhaust gas can be purified.

Next, a method for forming the above-described catalyst layer will be described. In the following description, a case where alumina is used as the catalyst support material layer will be described, but the same applies to the case where other catalyst support material layers are used.
First, an inorganic binder is added to alumina and mixed, and pulverized to produce a fine powder. As alumina, for example, γ-alumina can be used. γ-alumina can be adjusted by a sol-gel method or the like. Moreover, as an inorganic binder, although it does not specifically limit, a hydrated alumina etc. can be used, for example.

Next, the fine powder is combined with pure water and stirred using a stirrer or the like to prepare a slurry.
Then, the slurry is attached by spraying slurry on the inner surface of the honeycomb structure 1000 which is a ceramic block, or by immersing the honeycomb structure 1000 in the slurry and performing so-called wash coating.
Next, the honeycomb structure 1000 coated with the slurry is dried and fired at a predetermined temperature to form a catalyst support material layer on the inner surface of the honeycomb structure 1000.

When a catalytically active component is supported on the honeycomb structure 1000 by another supporting method, first, a solution of an aluminum-containing metal compound that becomes a catalyst support material layer is prepared.
As a raw material of the aluminum-containing metal compound, a metal compound such as a metal inorganic compound or a metal organic compound can be used.
As the metal inorganic compound, for example, Al (NO ₃ ) ₃ , AlCl ₃ , AlOCl, AlPO ₄ , Al ₂ (SO ₄ ) ₃ , Al ₂ O ₃ , Al (OH) ₃ or the like can be used. Among these, Al (NO ₃ ) ₃ and AlCl ₃ are more preferable because they are easily dissolved in solvents such as alcohol and water and are easy to handle.

As the metal organic compound, for example, metal alkoxide, metal acetyl cetonate, metal carboxylate and the like can be used. Specifically, Al (OCH ₃ ) ₃ , Al (OC ₂ H ₃ ) ₃ , Al (iso-OC ₃ H ₇ ) _3, or the like can be used.
As the solvent, for example, water, alcohol, diol, polyhydric alcohol, ethylene glycol, ethylene oxide, triethanolamine, xylene and the like can be used. These solvents are used by mixing at least one kind in consideration of dissolution of the metal compound.
Moreover, when preparing the said solution, you may add catalysts, such as hydrochloric acid, a sulfuric acid, nitric acid, an acetic acid, and a hydrofluoric acid. Furthermore, in order to improve the heat resistance of alumina, a simple substance or a compound of Li, K, Ca, Sr, Ba, La, Pr, Nd, Si, and Zr may be added together with the metal compound.

Next, a predetermined inner surface of the honeycomb structure 1000 is impregnated with the solution of the aluminum-containing metal compound by a sol-gel method. At this time, in order to spread the solution into all the pores that are gaps between the ceramic particles of the honeycomb structure 1000, for example, a method of filling the solution and degassing the honeycomb structure 1000 in a container Alternatively, it is desirable to employ a method of pouring the solution from one side of the honeycomb structure 1000 and deaeration from the other side.
As the deaerator, for example, an aspirator, a vacuum pump, or the like can be used.

Next, the honeycomb structure 1000 is heated at 120 to 170 ° C. for about 2 hours to evaporate and remove the solution to be gelled and fixed on the surface of the ceramic particles, and the excess solution is removed and 300 to 500 is removed. Temporary baking is performed by heating to about ° C.
Next, hydrothermal treatment is performed at 50 to 100 ° C. for 1 hour or longer. By performing this hydrothermal treatment, the alumina thin film formed on the surface of the ceramic particles grows in the form of fibrils (needle-like particles), exhibits a so-called flocked structure, and becomes a thin film with a rough surface.
Then, the catalyst support material layer is formed on the inner surface of the honeycomb structure 1000 by firing at 500 to 1000 ° C. for about 5 to 20 hours.

Next, the catalyst layer is formed by supporting the catalyst active component on the catalyst support material layer formed by any one of the above methods, and the heat exchanger 1000 of this embodiment can be manufactured.
The method for supporting the catalytically active component is not particularly limited, and examples thereof include an impregnation method, an evaporation to dryness method, an equilibrium adsorption method, an incipient wetness method, and a spray method. Further, the catalytically active component may be supported in any form. The form of the catalytically active component at the time of carrying can be a fine powder such as a metal or an alloy, or a compound. Examples of the compound include metal complexes. These forms of catalytically active components can be supported by using a dispersed or dissolved liquid.
The catalyst active component was supported after the catalyst support material layer was formed, but the supporting process is not particularly limited, and the catalyst active component is further added to the fine powder and water that are raw materials of the catalyst support material layer, It may be supported simultaneously with the formation of the catalyst support material layer.

As described above, in the heat exchanger according to the third embodiment, by supporting the catalyst layer 43 in the first space 41 of the honeycomb structure 1000, the exhaust gas passing through the first space 41 is cooled. In addition, a function of purifying harmful gas contained in the exhaust gas can be provided. In addition, a function of efficiently purifying harmful gas can be provided by heating the exhaust gas having a low temperature by heat exchange.
FIG. 19A shows the case where the catalyst layer 43 is provided on the entire top, bottom, left, and right of all the flow paths 60 in the first space 41, but this is not restrictive. For example, it may be provided only in the predetermined flow path 60, or may be provided only on a predetermined surface.
The shape of the first space 41 is not limited to that shown in FIG. 19A, and the first space 41 having various shapes can be employed.

<Fourth embodiment>
The heat exchanger of 4th Embodiment is demonstrated using a figure.
In addition, the same code | symbol is attached | subjected to the site | part which is common in the heat exchanger (1000) which concerns on 1st Embodiment mentioned above thru | or the heat exchanger (1000) which concerns on 3rd Embodiment, and the overlapping description is abbreviate | omitted. To do.
FIG. 20 is a perspective view of a heat exchanger according to the fourth embodiment of the present invention. 21 is a cross-sectional view of the heat exchanger according to the fourth embodiment of the present invention, where (a) is a cross-sectional view taken along the line KK ′ of FIG. 20, and (b) is a cross-sectional view taken along the line LL ′ of FIG. FIG.

As shown in FIGS. 20 and 21B, the heat exchanger (1000) of the fourth embodiment has a catalyst layer 43 on the inner surface of the second space 42, and the inner surface of the first space 41. Does not have a catalyst layer (see FIG. 21A).
Since the supported catalyst layer 43 and the method for supporting the catalytically active component are the same as in the case of the third embodiment described above, description thereof is omitted.

As described above, in the heat exchanger according to the fourth embodiment, since the catalyst layer 43 is provided in the second space 42 of the honeycomb structure 1000, the exhaust gas flowing through the second space 42 is cooled. Before, a function of purifying harmful gas contained in the exhaust gas can be imparted. In addition, a function of efficiently purifying harmful gas can be provided by heating the exhaust gas having a low temperature by heat exchange.
FIG. 21B shows the case where the catalyst layers 43 are provided on the entire upper, lower, left, and right sides of all the flow paths 60 in the second space 42, but the present invention is not limited to this. For example, it may be provided only in the predetermined flow path 60, or may be provided only on a predetermined surface.
The shape of the first space 41 is not limited to that shown in FIG. 21A, and the first space 41 having various shapes can be employed.

<Fifth Embodiment>
The heat exchanger of 5th Embodiment is demonstrated using a figure.
In addition, the same code | symbol is attached | subjected to the site | part which is common in the heat exchanger (1000) which concerns on 1st Embodiment mentioned above thru | or the heat exchanger (1000) which concerns on 4th Embodiment, and the overlapping description is abbreviate | omitted. To do.
FIG. 22 is a perspective view of a heat exchanger according to the fifth embodiment of the present invention. 23 is a cross-sectional view of a heat exchanger according to a fifth embodiment of the present invention, where (a) is a cross-sectional view taken along the line KK ′ of FIG. 22, and (b) is a cross-sectional view taken along the line LL ′ of FIG. FIG.

As shown in FIGS. 22, 23 (a) and (b), in the heat exchanger (1000) of the fifth embodiment, the catalyst layer 43 is provided on the inner surface of the first space 41 and the inner surface of the second space 42. Have.
Note that the catalyst layer 43 and the catalyst active component loading method and the like are the same as in the third embodiment described above, and a description thereof will be omitted.

As described above, in the heat exchanger of the fifth embodiment, since the catalyst layer 43 is provided in the first space 41 and the second space 42 of the honeycomb structure 1000, the first space 41 or Before the exhaust gas flowing through the second space 42 is cooled, a function of purifying harmful gas contained in the exhaust gas can be provided. In addition, a function of efficiently purifying harmful gas can be provided by heating the exhaust gas having a low temperature by heat exchange.
23A and 23B show the case where the catalyst layers 43 are provided on the entire upper, lower, left, and right sides of all the flow paths 60 in the first space 41 and the second space 42. Not limited to. For example, it may be provided only in the predetermined flow path 60, or may be provided only on a predetermined surface.
The shape of the first space 41 is not limited to that shown in FIG. 23A, and the first space 41 having various shapes can be employed.

The heat exchanger of the present invention can be used as a heat exchanger for an internal combustion engine, a combustion furnace, or the like.

DESCRIPTION OF SYMBOLS 11 1st end surface 12 2nd end surface 21 1st side wall 22 2nd side wall 30 Connection hole 31 1st opening 32 2nd opening 41 1st space 42 2nd space 43 Catalyst layer 50 Inner wall 60 Flow path 70 Sealing Part 80 Laser light 82 Water flow (water jet)
85 Laser source 90 Light diffusion medium 91 Glass rod 92 Devitrified glass 93 Water 1000 Honeycomb structure (heat exchanger)

Claims

A ceramic honeycomb structure having at least a first end surface, a second end surface, a first side wall, and a second side wall, and having a plurality of flow paths partitioned by an inner wall and extending from the first end surface to the second end surface is used. In the heat exchanger
A first opening formed in the first sidewall or the second sidewall;
A plurality of second openings that are formed in the plurality of inner walls facing the first openings and connect the plurality of flow paths;
The flow path having the first opening or the second opening has a sealing portion on each of the first end face and the second end face, and the flow having the first opening or the second opening. The road constitutes the first space by being connected by the connection hole,
The flow path without the first opening and the second opening constitutes a second space extending from the first end face to the second end face,
The first space and the second space are separated from each other by the inner wall and have a catalyst layer on the inner surface of the first space or the second space. .
The heat exchanger according to claim 1, wherein the heat exchanger has a plurality of the connection holes.
The heat exchanger according to claim 1 or 2, wherein the connection holes are alternately formed in a plurality of the flow paths facing the first side wall or the second side wall.
The heat exchanger according to any one of claims 1 to 3, wherein the first space has a plurality of the connection holes.
The heat exchanger according to any one of claims 1 to 4, wherein the heat exchanger has the connection holes on the first side surface and the second side surface, respectively.
The first opening and the second opening are configured in a slit shape,
6. The heat exchanger according to claim 1, wherein a length of the first opening is longer than a length of the second opening.
The heat exchanger according to claim 6, wherein the plurality of second openings are sequentially longer toward the first opening.
The first opening and the second opening are configured in a slit shape,
6. The heat exchanger according to claim 1, wherein the length of the first opening and the length of the plurality of second openings are all equal. 6.
The heat exchanger according to any one of claims 1 to 8, wherein the connection holes are stacked with the second openings having five or more layers.
10. The heat exchanger according to claim 9, wherein the connection hole has the second openings of 10 layers or more stacked.
11. The ceramic according to claim 1, wherein the ceramic is made of any one of silicon carbide, silicon-impregnated silicon carbide, alumina, cordierite, silicon nitride, aluminum nitride, or zirconia. Heat exchanger.