JP2008190740A - Primary heat transfer surface type heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a primary heat transfer surface type heat exchanger, reducing thermal stress generated in a heat transfer core, restraining bypass flow generated in a gap to a housing, and easily positioning the heat transfer core. <P>SOLUTION: This primary heat transfer surface type heat exchanger includes a heat transfer core where primary heat transfer surfaces are stacked with alternations of a high temperature fluid passage and a low temperature fluid passage formed between the respective layers. The heat exchanger includes the heat transfer core and a housing storing the heat transfer core with a gap, wherein a flexible pressing spacer having flexibility is installed on the inner surface of the housing to seal the gap between the heat transfer core and the housing. Thus, the gap between the heat transfer core and the housing is sealed to restrain a bypass flow, and the heat transfer core is abutted on the pressing spacer, thereby facilitating positioning of the heat transfer core. The generation of thermal stress due to differences in thermal expansion and heat contraction between the heat transfer core and the housing can be restrained by the pressing spacer having flexibility. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat exchanger that employs a primary surface transmission system, and more specifically, a thermal stress generated in a heat transfer core, and a bypass generated in a gap between the heat transfer core and a housing that accommodates the heat transfer core. The present invention relates to a primary heat transfer type heat exchanger that can suppress flow and facilitate positioning of a heat transfer core in a housing.

  In recent years, from the viewpoint of effective use of energy, distributed energy systems have been viewed as promising as an alternative to large-scale power generation systems. Among them, heat generation such as gas turbines and direct generation from fuel through chemical processes High-temperature fuel cells are being actively developed. In these distributed energy systems, exhaust heat recovery performance greatly affects the performance of gas turbines and high-temperature fuel cells, so gas turbines and high-temperature fuel cells have good heat recovery efficiency and effective heat exchange. It is essential to use a high-performance heat exchanger.

  In addition, since gas turbines and high-temperature fuel cells are repeatedly started and stopped, it is required to employ a heat exchanger having high durability against a temperature cycle. As a heat exchanger capable of sufficiently exhibiting such a function, a plate fin type heat exchanger for high temperature is used.

  The heat transfer core of a high-temperature plate fin type heat exchanger generally has a configuration in which a high-temperature fluid passage and a low-temperature fluid passage are alternately stacked with a tube plate interposed therebetween, and the low-temperature fluid passage is between two tube plates. It consists of a corrugated fin, a distributor fin, and a block with a spacer bar. The tube plate and the distributor fin are integrated with the corrugated fin by brazing or the like, but are basically separate members and may be referred to as a secondary heat transfer surface for convenience.

  On the other hand, instead of disposing another member by brazing or the like, for example, a thin alloy sheet such as stainless steel is formed in a corrugated shape so as to have a pleating property, or is bent. The heat transfer surface that is in direct contact with the hot and cold fluid on both sides of the surface is called the primary heat transfer surface.

  Up to now, various heat transfer cores have been proposed by combining the primary heat transfer surface and the secondary heat transfer surface, but in the high-temperature plate fin heat exchanger, the fuel efficiency is improved and the temperature cycle is reduced. From the viewpoint of high durability, a new heat exchanger has been developed that employs a primary surface transfer method, that is, a heat exchange method using only the primary heat transfer surface instead of the secondary heat transfer surface. .

  By producing a dimple-shaped distributor integrated with the primary heat transfer surface, the present inventors have obtained the same drift prevention effect as a passage formed by a secondary heat transfer surface such as a distributor fin. In Patent Document 1, a heat transfer core based on a primary heat transfer system using a primary heat transfer face plate configured integrally with a crushed distributor has been proposed.

  FIG. 1 is a view showing a heat transfer core by a primary surface transfer system, wherein FIG. 1 (a) is a view showing an example of a primary heat transfer surface plate, and FIG. 1 (b) is a view showing two or more primary heat transfer surface plates. It is a perspective view of the heat transfer core obtained by combining, and (c) is a figure showing typically the section of the distributor part of a heat transfer core. In addition, H in FIG.1 (b) shows the flow of a high temperature fluid, and L shows the flow of a low temperature fluid, respectively.

  The primary heat transfer surface plate 1 used in the heat transfer core 6 of the primary surface transfer system proposed in Patent Document 1 is formed by crushing a part of the primary heat transfer surface 2, and then distributing from the plane portion 3 and the dimple 4 to the distributor. By obtaining a part, it becomes the primary heat-transfer surface plate 1 comprised integrally with the distributor. Furthermore, the heat transfer core 6 is obtained by combining two types of primary heat transfer surface plates and sealing the side portions with the spacer bars 5. By adopting such a configuration, it is possible to prevent the drift of the low-temperature fluid and to improve the fuel efficiency by increasing the recovery rate of the high-temperature exhaust heat.

  The heat transfer core obtained from the primary heat transfer surface or the secondary heat transfer surface is accommodated in the housing and functions as a heat exchanger. However, if the heat transfer core is disposed in the housing without providing a gap between the outer periphery of the heat transfer core and the inner surface of the housing, thermal stress is generated due to the difference in thermal expansion and contraction between the heat transfer core and the housing, The heat transfer core is damaged. For this reason, when manufacturing a heat exchanger, in order to avoid the occurrence of thermal stress in the heat transfer core, the heat transfer core is provided with a margin in the housing, that is, a sufficient gap is provided. Deploy.

  FIG. 2 is a diagram schematically showing an example of a primary surface-type heat exchanger in which a heat transfer core is housed in a housing. In FIG. 2, the black arrow indicates the flow direction of the high-temperature fluid, and the white arrow indicates the flow direction of the bypass flow.

  In the primary heat transfer type heat exchanger 12 illustrated in FIG. 2, the heat transfer core 6 including the header 8 is disposed in the housing 7 with a sufficient gap in order to avoid generation of thermal stress. . The high-temperature and low-pressure fluid flowing from the inlet duct 9 is cooled by exchanging heat with the low-temperature and high-pressure fluid flowing from the header 8 in the heat transfer core 6 and then flows out from the outlet duct 10. . However, if a gap is provided between the heat transfer core 6 and the housing 7, the bypass flow flowing between the heat transfer core 6 and the housing 7 increases, and effective heat exchange by the heat transfer core 6 is not performed. There is a problem that the exchange efficiency decreases.

  In order to solve such a problem, for example, in Patent Document 2, a gap is provided between the outer periphery of the heat transfer core and the inner surface of the housing, and the heat transfer core is disposed in the housing. A laminated heat exchanger in which a wire mesh is interposed between the outer periphery of the housing and the inner surface of the housing is disclosed. According to this heat exchanger, since the heat stress generated between the heat transfer core and the housing is relieved by the wire mesh that is an elastic body, the heat transfer core can be prevented from being damaged by the heat stress. Moreover, since the clearance gap between the outer periphery of a heat-transfer core and the inner surface of a housing becomes a path | route which has a big distribution resistance by a wire mesh, the bypass flow which flows between a heat-transfer core and a housing can be suppressed as much as possible.

  However, the laminated heat exchanger disclosed in Patent Document 2 makes it difficult for fluid to flow between the heat transfer core and the housing by interposing a wire mesh between the outer periphery of the heat transfer core and the inner surface of the housing. Therefore, it is difficult to obtain a bypass flow sealing effect that can realize the heat exchange efficiency required for the heat exchanger that employs the primary transmission method.

  Furthermore, in the device configuration in which a gap is provided between the heat transfer core and the housing and the wire mesh is interposed, when the heat transfer core is inserted into the housing, there is no place where the heat transfer core comes into contact. There is a problem that it becomes difficult to position the heat transfer core in the direction perpendicular to the surface where the gap is provided, and the productivity of the heat exchanger is reduced.

  In addition, in the device configuration in which the wire mesh is interposed between the heat transfer core and the housing, when low-temperature fluid leaks from the heat transfer core, it becomes difficult to detect the heat transfer core and repair of the heat transfer core becomes difficult. .

Japanese Patent Application No. 2005-335379 JP 2004-132562 A

  As described above, when manufacturing the heat exchanger, if the heat transfer core is disposed in the housing without providing a gap between the heat transfer core and the housing, a difference in thermal expansion or heat shrinkage between the heat transfer core and the housing. This causes a problem that thermal stress is generated and the heat transfer core is damaged. Also, if a gap is provided between the heat transfer core and the housing in order to avoid the occurrence of thermal stress in the heat transfer core, the bypass flow flowing between the heat transfer core and the housing will increase. Therefore, the heat exchange efficiency decreases. Furthermore, if a gap is provided between the heat transfer core and the housing, there is no place where the heat transfer core contacts when the heat transfer core is inserted into the housing. Since it becomes difficult to position the heat transfer core with respect to the direction, and it takes time to manufacture the heat exchanger, productivity decreases.

  The present invention has been made in view of the above-described problems, can reduce the thermal stress generated in the heat transfer core, and can suppress the bypass flow generated in the gap between the heat transfer core and the housing that houses the heat transfer core. An object of the present invention is to provide a primary heat transfer type heat exchanger that facilitates positioning of a heat transfer core in a housing.

  The present inventors have made various studies for the purpose of solving the above problems. As a result, a spacer is installed on the inner surface of the housing when the heat transfer core is placed with a gap in the housing in order to suppress the thermal stress generated by the difference in thermal expansion and contraction between the heat transfer core and the housing. Then, attention is paid to the fact that the heat transfer core is easily positioned with respect to the direction perpendicular to the surface in which the gap is provided by bringing the heat transfer core into contact with the spacer.

  Furthermore, the present inventors have a spring structure for the spacer, so that the heat transfer core is pressed and the gap is sealed, so that the bypass flow between the heat transfer core and the housing can be suppressed, and the temperature can be reduced. We obtained knowledge that it was possible to avoid damage to the heat transfer core because it was possible to flexibly cope with the deformation of the heat transfer core accompanying changes.

The present invention has been completed on the basis of the above-described findings, and the gist of the present invention is the following (1) to (4) primary transmission type heat exchanger.
(1) In a primary heat transfer type heat exchanger having a heat transfer core in which a primary heat transfer surface plate is stacked and a high temperature fluid passage and a low temperature fluid passage are alternately formed between the layers, the heat transfer core; A housing for accommodating the heat transfer core through a gap is provided, and a flexible pressing spacer is installed on the inner surface of the housing so as to seal the gap between the heat transfer core and the housing. Primary heat transfer type heat exchanger characterized by the above.
(2) In the primary surface heat transfer heat exchanger according to (1), the pressing spacer is parallel to the stacking direction of the primary heat transfer surface plate among the inner surfaces of the housing, and the fluid inflow portion. Or by installing it on the surface that does not have the outflow part, and on the surface perpendicular to the stacking direction of the primary heat transfer surface plate, compared to the case where the pressing spacer is installed only in one direction, the heat transfer core and the housing The generated thermal stress due to a difference in thermal expansion or a difference in thermal contraction can be suppressed.
(3) In the primary transmission type heat exchanger described in (1) or (2) above, if a pressing spacer made of a bent metal thin plate is used, the structure of the pressing spacer is not complicated, and it is installed. Is desirable because it becomes easier.
(4) In the primary transmission type heat exchanger described in (1) to (3) above, if a stainless steel material or a Ni-based super heat-resistant alloy is used as the material for the pressing spacer, the strength and bending workability are excellent. It is desirable because a thin plate can be obtained.

  In the present invention, the “primary heat transfer surface plate” refers to a surface formed by forming a thin alloy sheet into a corrugated shape or bending it, instead of disposing another member integrated by brazing or the like. It refers to a heat transfer surface plate having heat transfer surfaces in direct contact with hot and cold fluids on both sides.

  According to the primary heat transfer type heat exchanger of the present invention, even if the heat transfer core is arranged with a gap in the housing, the spacer between the heat transfer core and the housing is provided by installing a pressing spacer on the inner surface of the housing. Since the gap is sealed, a bypass flow can be prevented and a decrease in heat exchange efficiency can be suppressed. In addition, when the heat transfer core is inserted into the housing, the heat transfer core is brought into contact with the pressing spacer so that the heat transfer core can be easily positioned in the direction perpendicular to the surface where the gap is provided. In addition, since the dimensional error of the heat transfer core and the housing is absorbed by the flexible pressing spacer, the manufacture of the heat exchanger is facilitated, so that the productivity can be prevented from decreasing.

  In addition, the primary heat transfer type heat exchanger of the present invention employs a structure in which the heat transfer core is disposed with a gap in the housing, and has a flexible pressing spacer on the inner surface of the housing. The generation of thermal stress due to the difference in thermal expansion and contraction between the heat transfer core and the housing can be suppressed, and the heat transfer core can be prevented from being damaged.

  Below, the primary transmission type heat exchanger of this invention is demonstrated based on drawing.

  FIG. 3 is a diagram schematically showing an example of the primary transmission type heat exchanger of the present invention. FIG. 3A is a diagram showing a heat exchanger having a trapezoidal heat transfer core, and FIG. ) Is a view showing an AA cross section. In the primary heat transfer type heat exchanger 12 illustrated in FIG. 3, the trapezoidal heat transfer core 6 is accommodated in the housing 7, and the heat transfer core 6 is arranged on the surface facing the surface to which the header 8 is connected. A gap is provided between the housing 7 and a flexible pressing spacer 11 is provided at two locations on the inner surface of the housing.

FIG. 4 is a diagram schematically showing an example of a primary surface heat transfer heat exchanger according to the present invention. FIG. 4A is a view showing a heat exchanger having a hexagonal heat transfer core. b) is a view showing an AA cross section.
In the primary heat transfer type heat exchanger 12 illustrated in FIG. 4, the hexagonal heat transfer core 6 is accommodated in the housing 7, parallel to the stacking direction of the primary heat transfer surface plates, and the header 8 or On two surfaces different from the surfaces to which the ducts 9 and 10 are connected, a gap is provided between the heat transfer core 6 and the housing 7, and two flexible pressing spacers 11 are provided on the inner surface of the housing. Is installed.

  Thus, since the pressing spacer 11 is installed on the surface where the gap is provided between the heat transfer core 6 and the housing 7, the heat transfer core 6 is inserted when the heat transfer core 6 is inserted into the housing 7. Is brought into contact with the pressing spacer 11 to facilitate positioning of the heat transfer core 6 in the direction perpendicular to the surface provided with the gap. Further, since the pressing spacer 11 has flexibility, the dimensional error of the heat transfer core 6 and the housing 7 is absorbed, so that the heat exchanger 12 can be easily manufactured and the productivity can be prevented from being lowered. .

  Furthermore, in order to more effectively suppress the thermal stress generated due to the difference in thermal expansion and contraction between the heat transfer core and the housing, the inner surface of the housing is parallel to the stacking direction of the primary heat transfer surface plate and the fluid It is also possible to install a pressing spacer having flexibility on a surface that does not have an inflow portion or an outflow portion and a surface that is perpendicular to the stacking direction of the primary heat transfer surface plate.

  FIG. 5 is a diagram schematically showing an example of the primary surface heat transfer heat exchanger of the present invention in which pressing spacers are installed on multi-directional surfaces, and FIG. 5 (a) has a trapezoidal heat transfer core. It is a figure which shows a heat exchanger, The same (b) is a figure which shows an AA cross section. In the primary heat transfer type heat exchanger 12 illustrated in FIG. 5, the trapezoidal heat transfer core 6 is accommodated in the housing 7, and the surface of the inner surface of the housing 7 that faces the surface to which the header 8 is connected. The pressing spacers 11 having flexibility are provided on two surfaces perpendicular to the stacking direction of the primary heat transfer surface plates, that is, three surfaces.

  FIG. 6 is a diagram schematically showing an example of a primary heat transfer type heat exchanger of the present invention in which pressing spacers are installed on multi-directional surfaces. FIG. 6A shows a hexagonal heat transfer core. It is a figure which shows the heat exchanger which has, and the same (b) is a figure which shows an AA cross section. In the primary heat transfer type heat exchanger 12 illustrated in FIG. 6, the hexagonal heat transfer core 6 is accommodated in the housing 7, parallel to the stacking direction of the primary heat transfer surface plates, and the header 8 or Flexible pressing spacers 11 are installed on two surfaces different from the surfaces to which the ducts 9 and 10 are connected, and two surfaces perpendicular to the stacking direction of the primary heat transfer surface plates, that is, four surfaces.

  Thus, the pressing spacer used in the primary heat transfer type heat exchanger of the present invention seals the gap even when the gap between the heat transfer core and the housing is provided in not only one direction but also in multiple directions. it can. In addition, by providing flexible pressing spacers in multiple directions, it is generated due to thermal expansion differences and thermal contraction differences between the heat transfer core and the housing, compared to when the pressing spacers are installed only in one direction. Thermal stress can be further suppressed.

  In the primary transfer type heat exchanger 12 illustrated in FIGS. 3 to 6, the high-temperature and low-pressure fluid flowing from the inlet duct 9 is heated in the heat transfer core 6 with the low-temperature and high-pressure fluid flowing from the header 8. After cooling by exchanging, it flows out from the outlet duct 10. At this time, since the gap between the heat transfer core 6 and the housing 7 is sealed by the pressing spacer 11, it is possible to prevent the occurrence of a bypass flow that flows between the heat transfer core and the housing. Therefore, according to the primary heat transfer type heat exchanger of the present invention, the heat exchange efficiency is 5 to 15 compared with the conventional primary heat transfer type heat exchanger in which the heat transfer core is disposed with a gap in the housing. % Can be improved.

  FIG. 7 is a diagram schematically showing an example of the structure of the pressing spacer used in the primary transmission type heat exchanger of the present invention, and FIG. 7 (a) is a diagram showing a triangular and both-end fixed pressing spacer. FIG. 4B is a diagram showing a trapezoidal type and a both-end fixed pressing spacer, and FIG. 4C is a diagram showing a triangular one-sided pressing spacer. 7 indicate the flow direction of the fluid flowing into the gap between the heat transfer core 6 and the housing 7.

  The pressing spacer 11 used in the primary heat transfer type heat exchanger of the present invention is not particularly limited in structure, and presses the heat transfer core 6 so that the gap between the heat transfer core 6 and the housing 7 can be sealed. In addition, any structure having flexibility to follow the deformation of the heat transfer core 6 accompanying a temperature change can be applied. However, since the primary transmission type heat exchanger is required to have high durability against a temperature cycle, a complicated structure should be avoided. Therefore, as the pressing spacer 11, a bent metal thin plate may be used. desirable.

  Moreover, the shape of the pressing spacer 11 used in the primary transmission type heat exchanger of the present invention can be applied to a triangle as shown in FIGS. 7A and 7C or a trapezoid as shown in FIG. 7B. Although not illustrated in FIG. 7, a circle, an ellipse, a waveform, or the like can be applied. Furthermore, as shown in FIGS. 7A and 7B, the pressing spacer 11 using the bent metal thin plate is fixed by welding or brazing at both ends of the metal thin plate contacting the housing 7 as shown in FIGS. In addition, as shown in FIG. 7C, a method of fixing one end of a thin plate in contact with the housing 7 by welding or brazing can also be applied.

  That is, the pressing spacer 11 used in the primary heat transfer type heat exchanger of the present invention presses the heat transfer core 6 so as to seal the gap between the heat transfer core 6 and the housing 7 and is accompanied by a temperature change. Any shape and installation method can be used as long as it has flexibility to follow the deformation of the heat transfer core 6. Therefore, even if any pressing spacer 11 illustrated in FIGS. 7A to 7C is used, it is possible to prevent the fluid from flowing between the heat transfer core 6 and the housing 7 and to transfer heat. Generation of thermal stress due to a difference in thermal expansion and thermal contraction between the core 6 and the housing 7 can be suppressed, and the heat transfer core 6 can be prevented from being damaged.

  FIG. 8 is a diagram schematically showing an example of the structure of a pressing spacer used in the primary surface heat transfer heat exchanger according to the present invention. FIG. 8 (a) shows the pressing when a groove is provided on the outer surface of the heat transfer core. FIG. 4B is a diagram showing a pressing spacer when a protrusion is provided on the outer surface of the heat transfer core. As shown in FIG. 8, among the outer surfaces of the heat transfer core 6, by providing grooves, protrusions, etc. on the surface where a gap is provided between the housing 7 and using a pressing spacer of a corresponding shape, When the heat transfer core 6 is inserted into the housing 7, the heat transfer core 6 can be easily positioned even in a direction horizontal to the surface where the gap is provided. Thereby, manufacture of a heat exchanger becomes easy and it can prevent that productivity falls.

  FIG. 9 is an exploded view schematically showing an example of main components of the primary transmission type heat exchanger of the present invention. In the primary heat transfer type heat exchanger shown in FIG. 9, a hexagonal heat transfer core 6 is adopted, and the header 8, the inlet duct 9 and the outlet duct 10 are arranged in the stacking direction of the primary heat transfer surface plate. Connected in the same vertical plane. In addition, flexible pressing spacers 11 are installed on the four inner surfaces of the housing 7.

  As described above, since the primary heat transfer type heat exchanger of the present invention does not require a complicated structure, when a low-temperature fluid leaks from the heat transfer core, the detection becomes easy and the heat transfer core Repair becomes easy.

  The material for the pressing spacer used in the primary transmission heat exchanger of the present invention is preferably made of a stainless steel material or a Ni-base superalloy. As described above, if a stainless steel material or a Ni-based super heat-resistant alloy is used as a raw material, a thin plate having high strength and excellent bending workability can be obtained. Furthermore, since the primary heat transfer surface plate is usually manufactured using a stainless steel or Inconel sheet, the unnecessary portion of the sheet that is discarded when the primary heat transfer surface plate is manufactured is diverted as a pressing spacer. If so, the material cost can be reduced. As the stainless steel material, for example, SUS347, SUS321, SUS310, SUS310S, SUS304 or the like can be used, and as the Ni-based superalloy, for example, Inconel 625 or the like can be used.

  According to the primary heat transfer type heat exchanger of the present invention, even if the heat transfer core is arranged with a gap in the housing, the spacer between the heat transfer core and the housing is provided by installing a pressing spacer on the inner surface of the housing. Since the gap is sealed, a bypass flow can be prevented and a decrease in heat exchange efficiency can be suppressed. In addition, when the heat transfer core is inserted into the housing, the heat transfer core is brought into contact with the pressing spacer so that the heat transfer core can be easily positioned in the direction perpendicular to the surface where the gap is provided. In addition, since the dimensional error of the heat transfer core and the housing is absorbed by the flexible pressing spacer, the manufacture of the heat exchanger is facilitated, so that the productivity can be prevented from decreasing.

  In addition, the primary heat transfer type heat exchanger of the present invention employs a structure in which the heat transfer core is disposed with a gap in the housing, and has a flexible pressing spacer on the inner surface of the housing. The generation of thermal stress due to the difference in thermal expansion and contraction between the heat transfer core and the housing can be suppressed, and the heat transfer core can be prevented from being damaged. Thereby, the primary transmission type heat exchanger of the present invention can maintain a high fuel efficiency, is easy to manufacture, and has a high durability against a temperature cycle. Widely applicable in the field of

It is a figure which shows the heat-transfer core by a primary surface transmission system, (a) is a figure which shows an example of a primary heat-transfer surface plate, (b) is obtained by combining two or more primary heat-transfer surface plates. It is a perspective view of a heat transfer core, and (c) is a figure showing typically a section of a distributor part of a heat transfer core. It is a figure which shows typically an example of the primary surface transmission type heat exchanger which accommodated the heat-transfer core in the housing. It is a figure which shows typically an example of the primary surface-type heat exchanger of this invention, the same (a) is a figure which shows the heat exchanger which has a trapezoid type heat-transfer core, and the same (b) is A-. It is a figure which shows A cross section. It is a figure which shows typically an example of the primary surface-type heat exchanger of this invention, the same (a) is a figure which shows the heat exchanger which has a hexagonal type heat-transfer core, and the same (b) is A It is a figure which shows -A cross section. It is a figure which shows typically an example of the primary transmission type heat exchanger of this invention by which the spacer for pressing was installed in the surface of multi-direction, The same (a) shows the heat exchanger which has a trapezoid type heat transfer core. (B) is a figure which shows an AA cross section. It is a figure which shows typically an example of the primary transmission type heat exchanger of this invention in which the spacer for pressing was installed in the multi-directional surface, The same (a) is a heat exchanger which has a hexagonal type heat transfer core. (B) is a figure which shows an AA cross section. It is a figure which shows typically the structural example of the spacer for a press used for the primary transmission type heat exchanger of this invention, The figure (a) is a figure which shows the spacer for a press which is a triangle type and both ends are fixed, (B) is a figure which shows the trapezoidal type and the both-ends fixed pressing spacer, and the figure (c) is a figure which shows the triangular type and the one side fixed pressing spacer. It is a figure which shows typically the structural example of the spacer for press used for the primary-surface-transfer-type heat exchanger of this invention, The figure (a) shows the spacer for press at the time of providing a groove | channel in the outer surface of a heat-transfer core. FIG. 4B is a diagram showing a pressing spacer when a protrusion is provided on the outer surface of the heat transfer core. It is an exploded view which shows typically an example of the main components of the primary transmission type heat exchanger of this invention.

Explanation of symbols

1. Primary heat transfer surface plate Primary heat transfer surface 3. Flat part of primary heat transfer surface after crushing process Dimple 5. Spacer bar 6. Heat transfer core 7. Housing 8. Header 9 Inlet duct 10. Outlet duct 11. Pressing spacer 12. Primary heat transfer type heat exchanger

Claims (4)

In a primary heat transfer type heat exchanger having a heat transfer core in which a primary heat transfer surface plate is laminated and a passage for high-temperature fluid and a passage for low-temperature fluid are alternately formed between each layer,
The heat transfer core includes a housing that accommodates the heat transfer core through a gap, and the inner surface of the housing is flexible so as to seal the gap between the heat transfer core and the housing. A primary heat transfer type heat exchanger characterized in that a spacer is installed.   Of the inner surface of the housing, the pressing spacer is parallel to the laminating direction of the primary heat transfer surface plate and has no fluid inflow portion or outflow portion, and the laminating direction of the primary heat transfer surface plate The primary transmission type heat exchanger according to claim 1, wherein the primary transmission type heat exchanger is installed on a plane perpendicular to the vertical plane.   The primary transfer heat exchanger according to claim 1 or 2, wherein the pressing spacer is made of a bent metal thin plate.   The primary transfer type heat exchanger according to any one of claims 1 to 3, wherein the pressing spacer is made of a stainless steel material or a Ni-base superalloy.

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