WO2015068783A1

WO2015068783A1 - Heat exchanger

Info

Publication number: WO2015068783A1
Application number: PCT/JP2014/079509
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: 2013-11-06
Filing date: 2014-11-06
Publication date: 2015-05-14
Also published as: JPWO2015068783A1

Abstract

A heat exchanger comprising a ceramic honeycomb structure having at least a first end surface, a second end surface, a first sidewall, a second sidewall, and a plurality of channels extending from the first end surface to the second end surface and partitioned by inner walls, wherein: the honeycomb structure also has a connecting hole comprising a first opening formed in the first sidewall or the second sidewall, and a second opening for connecting the plurality of channels and formed in the plurality of inner walls facing the first opening; the channels having the first or second openings also have a sealing part on each of the first and second end surfaces; the channels having the first or second openings form a first space by being connected via the connecting hole, and the channels not having the first or second openings form 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 one another by the inner walls.

Description

Heat exchanger

The present invention relates to a heat exchanger made of 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.

Japanese Unexamined Patent Publication No. 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.

The present invention exceeds the application range of such a conventional heat exchanger composed of a ceramic honeycomb structure, and has a honeycomb structure that can provide a new function to the honeycomb structure and handle a new fluid flow. An object is to provide a 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. A heat exchanger composed of a ceramic honeycomb structure having a plurality of extending flow paths, wherein a first opening formed in the first side wall or the second side wall and a plurality of inner walls facing the first opening And a second opening for connecting a plurality of flow paths, and the flow path having the first opening or the second opening has the first end face and the second end face. Each of the flow paths having the first or the second opening constitutes a first space by being connected by the connection hole, and the first opening and the first opening 2 without the opening is the first end face Constitutes a second space extending al the second end surface, said first space, said second space is characterized by being isolated from each other by the inner wall.

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 composed of 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.

Furthermore, the honeycomb structure of the present invention desirably 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) It is preferable that the said heat exchanger has the said connection hole in the said 1st side wall and the said 2nd side wall, 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 configured 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 become longer in order toward the first opening on the side wall.
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.
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 holes are stacked with the second openings having five or more layers.
The heat exchanger of this invention can supply a 1st fluid to the 6th flow path counted from the 1st side wall side by stacking the 2nd opening 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) In the connection hole, the second openings having ten or more layers are stacked.
The heat exchanger of the present invention can supply the first fluid to the eleventh channel counted from the first side wall by stacking the second openings of five or more layers. 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 made 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. 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 New functions can be added that are not found in heat exchangers made of body.

The perspective view of the heat exchanger of Embodiment 1 which concerns on this invention. It is a perspective view of the modification of the heat exchanger of Embodiment 1 which concerns on this invention, (a) shows the honeycomb structure which has one slit-shaped connection hole, (b) has the 1st side wall. 1 shows a honeycomb structure in which slit-like connection holes are formed in a part of a facing channel. 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. FIG. 6 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, corresponding to the cross-sectional view taken along the line AA ′ of FIG. 1, (a) having a V-shaped cross-sectional shape; A certain connection hole is shown, (b) shows the connection hole aligned so that one side of the 1st and 2nd opening becomes perpendicular, and (c) shows the length of the 1st opening and the 2nd opening Shows a connection hole penetrating the first side wall and the second side wall, and (d) is a connection hole formed from the first side wall and the second side wall, each sharing a bottom inner wall, (E) shows a connection hole whose inside is larger. It is a perspective view of the modification of the heat exchanger of Embodiment 1 which concerns on this invention, (a) shows the honeycomb structure which has four circular connection holes, (b) is a connection of four groups. A group of connection holes has a honeycomb structure including five circular connection holes, and (c) shows a honeycomb structure having one circular connection hole. FIG. 6 is a cross-sectional view of a modification of the heat exchanger of FIG. 5, (a) is a cross-sectional view taken along the line CC ′ of FIG. 5 (a), (b) is a cross-sectional view taken along the line EE ′ of FIG. 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. (A) is a perspective view of the heat exchanger of Embodiment 2 which concerns on this invention. (B) is a perspective view of the modification of the heat exchanger of Embodiment 2 which concerns on this invention. 7A and 7B are cross-sectional views of a heat exchanger according to a second embodiment of the present invention, in which FIG. 7A is a cross-sectional view along GG ′ in FIG. 7A and FIG. 7B is a cross-sectional view along II ′ in FIG. FIGS. 7C and 7C are a sectional view taken along line HH ′ in FIG. 7A and a sectional view taken along line JJ ′ in FIG. It is explanatory drawing which shows an example of the manufacturing method of the connection hole of the heat exchanger which concerns on this invention, and a connection hole is an example comprised by 1st and 2nd opening of slit shape with the same length, (a ) Shows an explanatory diagram using a cross-sectional view, and (b) shows an explanatory diagram using a side view. It is explanatory drawing which shows an example of the manufacturing method of the connection hole of the heat exchanger which concerns on this invention, a connection hole is slit shape, 1st opening is longer than 2nd opening, and 2nd opening is 1st. It becomes longer toward the opening. It is explanatory drawing which shows an example of the manufacturing method of the connection hole of the heat exchanger which concerns on this invention, a connection hole is slit shape, 1st opening is longer than 2nd opening, and 2nd opening is 1st. (A) shows a step of forming first and second openings having the same length, and (b) shows a laser after the step (a). A process of scanning while appropriately tilting light is shown. It is explanatory drawing which shows an example of the manufacturing method of the connection hole of the heat exchanger which concerns on this invention, a connection hole is slit shape, 1st opening is shorter than 2nd opening, and 2nd opening is 1st. (A) shows a process of forming first and second openings having the same length, and (b) shows a laser after the process of (a). A process of scanning while appropriately tilting light is shown. 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 light-transmitting stick | rod which has a curved surface in the flow path. . In (b), devitrified glass is inserted in the flow path. In (c), 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 consisting of the honeycomb structure which concerns on this invention with the laser beam guide | induced by the water flow (water jet), (a) is in a flow path. A light-transmitting rod having a curved surface is inserted. In (b), devitrified glass is inserted in the flow path. In (c), water is put in the flow path. It is the external appearance photograph (a) of the heat exchanger which consists of a honeycomb structure of the Example which concerns on this invention, and its explanatory drawing (b). It is a cross-sectional photograph (a) of the connection hole of the heat exchanger which consists of a honeycomb structure of the Example which concerns on this invention, and its explanatory drawing (b). It is explanatory drawing which shows in detail the cutting position and cutting | disconnection direction of FIG. 3 which are sectional drawings of FIG.

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 made of a honeycomb structure having an 8 × 8 grid-like flow path has been described. For example, a hexagonal flow path honeycomb, a combination of octagonal and quadrangular flow paths is used. There are no particular limitations on honeycombs.

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. A heat exchanger composed of a ceramic honeycomb structure, wherein a plurality of flow paths are formed in a first opening formed in the first side wall or the second side wall and a plurality of inner walls facing the first opening. And the flow path having the first or second opening has a sealing portion on each of the first end face and the second end face, and The flow path having the first or second opening constitutes a first space by being connected by the connection hole, and the flow path without the first opening and the second opening has a first end face A second space extending from the first end surface to the second end surface, And between the second space are separated from each other by the inner wall.

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, it can handle a fluid even in a severe environment such as a high temperature environment or a corrosive environment.

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.

The heat exchanger of the present invention is not particularly limited, but preferably has a plurality of 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 of 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 wall and the second side wall, 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. .
In the honeycomb structured body of the present invention, the first opening and the second opening are formed in a slit shape, whereby fluid can be efficiently supplied from the side of the elongated channel. 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 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 both 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.

The connection hole of the heat exchanger of the present invention is preferably formed by stacking five or more second openings.
The heat exchanger of this invention can supply a 1st fluid to the 6th flow path counted from the 1st side wall side by stacking the 2nd opening 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.

The connection hole of the heat exchanger of the present invention preferably has 10 or more layers of second openings stacked.
The heat exchanger of the present invention can supply the first fluid to the eleventh channel counted from the first side wall by stacking the second openings of five or more layers. 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.

The ceramic of the heat exchanger of the present invention is preferably made of any one of silicon carbide, silicon-impregnated silicon carbide, alumina, cordierite, silicon nitride, aluminum nitride, or zirconia.
The heat exchanger of 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 can guide the laser beam into the water jet water flow and guide it to the processing point while totally reflecting it, and the laser beam passes through the 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. Alumina sol, silica sol, etc. can be used as the inorganic binder, polyvinyl alcohol, phenol resin, etc. can be used as the organic binder, and silicon carbide, alumina, cordierite, silicon nitride, aluminum nitride, zirconia, etc. can be used as the inorganic particles.

Next, Embodiment 1 and Embodiment 2 of the present invention will be described.

The first embodiment has sealing portions 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, and the second It is a heat exchanger with which the 1st end surface and 2nd end surface of this space are open | released.

Embodiment 2 is a heat exchanger of the following form.
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.

<Embodiment 1>
The heat exchanger of Embodiment 1 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. . 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 according to Embodiment 1 includes eight channels 60 in contact with the first side wall 21 of the honeycomb structure 1000 (heat exchanger) having 8 × 8 channels. The four connection holes 30 are provided. 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 four circular connection holes 30 that are alternately arranged among the eight flow paths 60 in contact with the first side wall 21 of the honeycomb structure 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. (A) shows the connection hole whose cross-sectional shape is V-shaped, the first opening 31 is longer 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 long. (B) shows the connection holes aligned so that one side of the first and second openings is vertical. The first opening 31 is longer than the second opening 32, and the plurality of second openings 32 are The connection hole is configured to become longer in order toward the first opening 31, and the connection hole has a trapezoidal cross section. (C) shows the connection hole 30 having the same length of the first opening 31 and the second opening 32 and penetrating the first side wall 21 and the second side wall 22. (D) shows the connection hole 30 in which the connection hole 30 is formed from the 1st side wall 21 and the 2nd side wall 22, and each shares the inner wall used as a bottom. (E) shows the connection hole 30 having a larger inside, the first opening 31 is shorter than the second opening 32, and the plurality of second openings 32 become shorter toward the first opening 31 in order. It is configured as follows.

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 grid-like flow paths 60 has been described. For example, a hexagonal flow path honeycomb, octagonal and quadrangular flow paths are used. There are no particular limitations on the honeycomb of the combination.

The honeycomb structure (heat exchanger) of the present embodiment can be obtained by forming connection holes in the first side wall or the second side wall of the honeycomb-shaped ceramic. As shown in FIG. 9, the first and second openings are formed by inserting the light diffusion medium 90 into the flow path 60 facing the second side wall 22 and moving the laser source 85 to scan the laser light 80. 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 length of insertion of the light diffusion medium 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. First, similarly to the example of FIG. 9, after forming the slit-like first and

second openings

31 and 32 having the same length as shown in FIGS. 11A and 12A, FIG. As shown in FIG. 12B, scanning is performed while the laser beam 80 is appropriately inclined. In the example of FIG. 11, the first opening is longer than the second opening, and the second opening is sequentially longer toward the first opening. In the example of FIG. 12, the first opening is the second opening. The second opening is shorter toward the first opening in order.

The honeycomb structure 1000 (heat exchanger) of the present embodiment can be processed by leaving the bottom of the connection hole 30 by inserting the light diffusion medium 90. 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. 13 (c) and 14 (c) are explanatory views using water 93 as the light diffusion medium 90. The laser light 80 is diffused and connected by the turbulent reflection of bubbles generated by heat and water turbulence due to processing. Processing can be performed leaving the bottom of the hole 30.

<Embodiment 2>
The heat exchanger of Embodiment 2 is demonstrated using a figure.
Fig.7 (a) is a perspective view of the heat exchanger of Embodiment 2 which concerns on this invention. (B) is a perspective view of the modification of the heat exchanger of Embodiment 2 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. FIG. 8A is a cross-sectional view taken along the line GG ′ of FIG. 7A, and FIG. 8B is a cross-sectional view taken along II of FIG. 'Cross sectional view, (c) is a HH' sectional view of FIG. 7 (a) and JJ 'sectional view of FIG. 7 (b).

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 bottoms of the connection holes 30 reach the second side wall 22. . The connection hole 30 does not penetrate the second side wall 22. Each of the first end surface 11 and the second end surface 12 of the flow path having the first opening and the second opening has a sealing portion 70, thereby forming a first space.

The flow path without the first opening and the second opening constitutes a second space extending from the first end surface 11 to the second end surface 12, and the first space and the second space are separated from each other by the inner wall. ing. The first space has connection holes on the first and second side walls. The first space is composed of four independent spaces, and 32 4 × 8 independent flow paths constitute the second space.
The first space can create a fluid flow from the first side wall 21 to the second side wall 22 (and vice versa). The second space 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 and the second space are separated by the inner wall, they do not mix with each other, and the amount of heat can be moved through the inner wall.
This effect can be suitably used as a heat exchanger.

The honeycomb structure (heat exchanger) of the present embodiment can be obtained by forming connection holes in the first side wall or the second side wall of the honeycomb-shaped ceramic. As shown in FIG. 9, the first and second openings can be processed by inserting a light diffusion medium 90 into a flow path 60 facing the second side wall 22 and scanning with laser light 80. it can. Depending on the shape of the connection hole, the connection hole having a desired shape can be obtained by appropriately changing the length of insertion of the light diffusion medium 90 as shown in FIG. Further, as shown in FIG. 11 and FIG. 12, a connection hole having a desired shape may be obtained by scanning while appropriately tilting the laser beam 80. .

The honeycomb structure (heat exchanger) of the present embodiment can be processed while leaving the bottom of the connection hole by inserting a light diffusion medium. 13 and 14 show how the laser light is diffused by the light diffusion medium 90. FIGS. 13A, 13B, and 13C show processing using only laser light, and FIGS. 14A, 14B, and 14C show processing using laser light that also uses a water jet. 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.

FIGS. 13 (a) and 14 (a) are explanatory views using a glass rod 91 for the light diffusing medium 90, and processing is performed by diffusing the laser light 80 by the convex surface of the glass, leaving the bottom of the connection hole. it can.
FIG. 13B and FIG. 14B are explanatory diagrams in which a devitrifying glass 92 is used for the light diffusion medium 90, and the laser light 80 is diffused by irregular reflection inside the glass so as to leave the bottom of the connection hole. be able to.
FIGS. 13 (c) and 14 (c) are explanatory views using water 93 as the light diffusion medium 90. The laser light 80 is diffused and connected by the turbulent reflection of bubbles generated by heat and water turbulence due to processing. It can be processed leaving the bottom of the hole.

In this example, a result of manufacturing a honeycomb structure (heat exchanger) according to the present invention by forming connection holes having a trapezoidal cross section in a honeycomb-shaped ceramic actually made of porous silicon carbide is shown in FIG. This will be described with reference to FIG.
A honeycomb structure 1000 (heat exchanger) 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 flow paths 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 has a thickness of 0.25 mm, and the first and second side walls have a thickness of 0.3 mm. The size of the flow path is a square having a side of 1.14 mm.

As shown in FIG. 15, connection holes were formed in this honeycomb-shaped ceramic. Twelve connection holes 30 are formed by forming first openings in twelve flow paths alternately among the twenty-four flow paths facing the first side wall, and further forming second openings. did. The bottom of the connection hole 30 is the second side wall 22, and the second opening is formed in all the inner walls. The distance between the first opening and the second opening and the first end face is 10 mm, the first opening 31 extends from the first end face 11 to a position of 40 mm, and the second opening 32 in the lowermost layer is the first end face 11. To 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 is 0.6 mm.

A detailed processing method will be described below. When forming the connection hole, a circular glass rod longer than the flow path is inserted into the flow path facing the second side wall 22, and the circular glass up to a portion other than the trapezoidal basin is inserted into the other flow path. Inserted a stick.
Next, it processed using the MCS300 type | mold laser processing machine by Makino milling company along the flow path which faces a 1st side wall. 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 1000 (heat exchanger) 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 can be formed by a laser processing machine using a water flow. The method of forming the connection hole 30 in the honeycomb structure 1000 (heat exchanger) is not limited to the laser beam using the water flow 82. If the laser processing machine takes time and has a high output, the water flow is not used together. Can be processed.

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

This application is based on Japanese Patent Application No. 2013-230359 filed on November 6, 2013, the contents of which are incorporated herein by reference.

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 50 Inner wall 60 Flow path 70 Sealing part 80 Laser beam 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 face, a second end face, 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 face to the second end face. In the heat exchanger,
A first opening formed in the first sidewall or the second sidewall;
A second opening formed on a plurality of inner walls facing the first opening and connecting a plurality of flow paths;
A connection hole made of
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 path having the first or second opening is While constituting 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 heat exchanger comprising a honeycomb structure, wherein the first space and the second space are separated from each other by the inner wall.
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 in the first side wall and the second side wall, 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,
8. The heat exchanger according to claim 1, wherein a length of the first opening and a plurality of the second openings are equal to each other. 9.
The heat exchanger according to any one of claims 1 to 8, wherein the connection hole has five or more layers of the second openings stacked.
10. The heat exchanger according to claim 9, wherein the connection hole has the second openings of 10 layers or more stacked.
The heat exchange according to any one of claims 1 to 10, wherein the ceramic is made of silicon carbide, silicon carbide impregnated with silicon, alumina, cordierite, silicon nitride, aluminum nitride, or zirconia. vessel.