JPH0590167U - Plate fin heat exchanger - Google Patents

Abstract

(57) [Summary] [Purpose] In relation to the plate fin heat exchanger, the brazed part is isolated from the outside to reduce the effect when a leakage accident occurs,
Also, ensure the inspectability of the brazed part. A plurality of separators and corrugated fins that are arranged between the separators and form a plurality of stacked heat exchange passages in parallel are provided, and a heat exchange section is housed inside the separator container. One of the inlet and outlet of the cryogenic fluid is connected to the heat exchange passage through the collecting pipe that penetrates the isolation container, and the other of the inlet and outlet is connected to the heat exchange passage through the internal space of the isolation container. Is arranged in a state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a plate fin heat exchanger.

[0002]

[Prior Art]

 FIG. 4 and FIG. 5 show a structural example of the plate fin heat exchanger disclosed in Japanese Utility Model Laid-Open No. 2-140172. In the figure, reference numeral 1 is a casing, 2 is a side block, 3 is a separating plate (plate), 4 is a corrugated fin, 5 is a heat exchange channel, 6 is a high temperature channel, 7 is a low temperature channel, and 6a and 7a. Is a small channel, 8 is both front plates, 9 is a connecting channel, 10A and 10B are high temperature fluid merging headers, and 11A and 11B are low temperature fluid merging headers.

In the plate fin heat exchanger having such a structure, the high-temperature fluid is inserted between the high-temperature fluid merging headers 10 A and 10 B as shown by solid arrows in FIG. The low temperature fluid is inserted between the headers 11A and 11B as shown by the broken line arrow in FIG. 4 to perform heat exchange. At that time, the heat exchange flow path 5 and the connection flow are connected. In the passage 9, the contact area between the corrugated fins 4 and the fluid is increased to improve the heat exchange efficiency, and the heat exchange efficiency is higher than that of other general heat exchangers. It is considered to be suitable for heat exchange between a gas and a gas, such as a gas in a high temperature state or air in a low temperature state, because of its high temperature, and downsizing based on high heat exchange efficiency. Can be planned.

[0004]

[Problems to be solved by the device]

 However, in such a plate fin heat exchanger, since the space between the side block 2 and the separator 3 has a brazing structure, it is necessary to prevent leakage of the internal fluid. In particular, when handling fluids containing radioactive substances, harmful substances, etc., it is required to establish reliability against leakage, but it is difficult to satisfy such demands with the structures of the examples shown in FIGS. 4 and 5. is there.

The present invention effectively solves the problems of the prior art. In other words, the purpose is to make it possible to isolate the brazed part from the outside and to ensure the checkability of the brazed part.

[0006]

[Means for Solving the Problems]

 To achieve the above object, the plate fin heat exchanger according to the present invention employs the following means. A plate fin heat exchanger according to a first aspect of the present invention comprises: separator plates arranged at parallel intervals; and corrugated fins arranged between the separator plates to form a plurality of stacked heat exchange channels in parallel. In the heat exchanger, the heat exchange section is housed inside the isolation container, and one of the inlet and outlet of the high temperature fluid and the low temperature fluid is connected to the heat exchange flow path via the collecting pipe that penetrates the isolation container. The other of the inlets and outlets is arranged so as to be connected to the heat exchange passage via the internal space of the isolation container. In the plate fin heat exchanger according to claim 2, a configuration is added in which a collecting pipe is arranged at the inlet / outlet of the high temperature fluid and the inlet / outlet of the low temperature fluid is connected to the internal space of the isolation container. In the plate fin heat exchanger according to the third aspect, a partition wall that partitions the internal space of the isolation container is arranged between the inner wall of the isolation container and the outer side of the heat exchange section. In the plate fin heat exchanger according to the fourth aspect, a configuration is added in which the heat exchange flow passage for the high temperature fluid and the heat exchange flow passage for the low temperature fluid are arranged in an orthogonal state. In the plate fin heat exchanger according to claim 5, a separation flange that allows the collecting pipe and the heat exchange unit to be pulled out from the isolation container is arranged in a part of the isolation container, and a part of the flange is joined to the partition wall. In addition, a configuration in which a separate engaging connection portion is arranged is added.

[0007]

[Action]

 In the plate fin heat exchanger according to claim 1, since the heat exchange section is isolated by the isolation container, the brazing portion is isolated from the outside, and when the fluid leaks from the brazing portion, the fluid Will not spread outside. Then, one of the fluids is supplied to and recovered from the heat exchange passage via the internal space of the isolation container, thereby reducing the pressure loss in the connection portion. In the plate fin heat exchanger according to claim 2, the high temperature fluid is inserted into the collecting pipe and the low temperature fluid is inserted into the internal space of the isolation container, so that the liquid amount becomes large. The effect on the surrounding environment of the heat exchanger is reduced by reducing the temperature of the heat exchanger and bringing the low temperature fluid side closer to the outside. According to the plate fin heat exchanger of the third aspect, by disposing the partition wall, the occurrence of a fluid short circuit between the inlet and the outlet is suppressed. In the plate fin heat exchanger according to claim 4, since the heat exchange flow paths are orthogonal to each other, it is easy to set the collecting pipe away from the vicinity of the connection port with the internal space of the isolation container, and the inlet and outlet ports are separated from each other. Reduces mutual interference with position settings. According to the plate fin heat exchanger of the fifth aspect, by pulling out the collecting pipe and the heat exchanging part from the isolation container, the heat exchanging part is opened, and the brazing part and the like can be inspected.

[0008]

【Example】

 An embodiment of the plate fin heat exchanger according to the present invention will be described below with reference to FIGS.

In these drawings, reference numeral 20 is an isolation container, 21 is a heat exchange part, 22 is a collecting pipe, 23 is an internal space, 24 is a partition wall, 25 is a separation flange, 26 is an engaging connection part, 27 Is a fitting.

Explaining these details, the isolation container 20 is separable from the portion of the separation flange 25, and in the example of FIG. 2, by welding the edge portion of the separation flange 25 1. The structure is such that a sealing property during assembly is obtained.

As shown in FIG. 2, the heat exchanging portion 21 is placed in an internal space 23 in a state of being suspended from the upper mirror portion of the isolation container 20 by two collecting pipes 22. .. Then, the heat exchange part 21 has side blocks 2, separators 3, corrugated fins 4, etc. so as to form the heat exchange flow path 5 and the connection flow path 9 described in the examples of FIGS. 4 and 5. It is made up of a set of integrated units. In addition, as shown in FIGS. 1 and 2, the heat exchange flow path for high temperature fluid (high temperature flow path) 6 and the heat exchange flow path for low temperature fluid (low temperature flow path) 7 are in mutually orthogonal states. Will be distributed to.

As shown in FIG. 1, FIG. 2 and FIG. 3, the collecting pipe 22 is in a state of penetrating the isolation container 20 and is connected to the high temperature flow path 6 of the heat exchanging part 21. A slit 22a is formed, the upper part serves as an inlet / outlet for high-temperature fluid (high-temperature fluid merging headers 10A and 10B), and the lower part is closed by a closing lid 22b.

The partition wall 24 is arranged between the inner wall of the isolation container 20 and the outer portion of the heat exchange section 21 so as to divide the entire area of the inner space 23 into two parts. The partition wall 24 is integrally attached to, for example, the heat exchange portion 21 and the collecting pipe 22 so as to surround the periphery thereof, and the engaging connection portion 26 is interposed, whereby the partition wall 24 of the isolation container 20 is provided. The joining state or the separated state is set to be selectable with respect to the mounting member 27 integrated with the inner wall surface. That is, the mounting member 27 is arranged in a U shape in the range below the separating flange 25 in FIG. 2, and is joined to the edge of the partition wall 24 in this range and at the inlet / outlet of the cryogenic fluid. (Head for low temperature fluid merging) The fluid pressure difference between 11A and 11B is set so that the contact between the joints is tight.

Therefore, half of the internal space 23 is used for the cold fluid merging head 11A that is the inlet side of the cryogenic fluid, and the other half of the internal space 23 is for the cold fluid merging that is the outlet side of the cryogenic fluid. The internal space 23 is directly connected (communicated) to the upstream and the downstream of the low temperature flow passage 7, and the connection flow passage 9 is omitted on the low temperature side.

In the plate fin heat exchanger configured as described above, when the high temperature fluid is fed from the inlet side high temperature fluid merging header 10 A, the inside of the collecting pipe 22, the slit 22 a, the high temperature passage 6, the slit 22a, and the other collecting pipe 22, and is discharged from the high temperature fluid merging header 10B on the outlet side. Then, the low temperature fluid is sent from the low temperature fluid merging header 11A, passes through the internal space 23 of the isolation container 20, the low temperature passage 7, and the other half of the internal space 23, and is used for low temperature fluid merging on the outlet side. The heat is discharged from the header 11B and heat is exchanged in the heat exchange section 21.

In this case, the brazed portion of the heat exchange section 21 is isolated from the outside by the isolation container 20, and even if fluid leakage from the brazed portion occurs, this is not the case. It does not lead to the diffusion of fluid to the outside.

Since the volume of the cryogenic fluid is large in the internal space 23 of the isolation container 20, the pressure is made uniform, and the volume of the cryogenic fluid and the low temperature flow are equalized. Since the fluid is circulated between the passage 7 and the passage 7, even if the fluid is a liquid such as water, the pressure loss at the connecting portion of the passage can be reduced.

Therefore, it is advantageous to insert the high temperature fluid into the collecting pipe 22 and insert the low temperature fluid into the internal space 23. The reason is that, as shown in FIG. 1, the environment of the heat exchanger is reduced by reducing the flow path resistance of the low temperature fluid having a larger liquid volume than that of the collecting pipe 22 and by bringing the low temperature fluid side close to the outside. This is to reduce the effect on

On the other hand, as shown in FIG. 1, when the high temperature channel 6 and the low temperature channel 7 are set in an orthogonal state, the collecting pipe 22 is separated from the vicinity of both ends of the low temperature channel 7, and Mutual interference with the position setting is reduced.

When pulling out the heat exchange section 21 to the outside of the isolation container 20 at the time of regular inspection, etc., the heat exchange section 21, the collecting pipe 22, and the partition wall 24 are separated from the separation flange 25. It is done by pulling out from 20. By exposing the outer portion of the heat exchange section 21, the brazed portion is inspected.

<Other Embodiments> In the present invention, the following technique can be adopted instead of the above-described embodiment. Insert hot fluid into the internal space 23. Arranging the high-temperature flow path 6 and the low-temperature flow path 7 in parallel and opposite flow. In that case, the connection channel 9 should be provided in the low temperature channel 7. When the isolation container 20 and the heat exchange section 21 are separated, a structure in which part or all of the partition wall 24 is left inside the isolation container 20 is adopted. Disposing the engaging connection portion 26 in another portion, and adopting another structure.

[0022]

[Effect of the device]

 As described above, the plate fin heat exchanger according to the present invention has the following effects. (1) By accommodating the heat exchange part inside the isolation container, the brazed part can be isolated from the outside, and the safety at the time of internal fluid leakage can be improved. (2) By isolating the heat exchange part from the outside, it is possible to prevent the accident from spreading at the time of leakage even if the internal fluid contains radioactive substances or harmful substances. (3) By arranging the internal space of the isolation container and the heat exchange flow path in a connected state, it is possible to smooth the flow of the fluid and reduce the pressure loss in the flow path. (4) By selecting the insertion of the cryogenic fluid into the internal space of the isolation container, the flow resistance of the cryogenic fluid is reduced, and by bringing the cryogenic fluid side closer to the outside, the environment surrounding the heat exchanger is reduced. The influence can be reduced. (5) By placing a partition wall that separates the internal space of the isolation container between the inner wall of the isolation container and the outer portion of the heat exchange section, it is possible to suppress the occurrence of a fluid short circuit between the inlet and outlet. By filling the inside of the isolation container with a fluid, it is possible to reduce the temperature change applied to the container wall and reduce the occurrence of thermal stress. (6) By making the high temperature and low temperature flow paths orthogonal to each other, it becomes easy to set the collecting pipe away from the vicinity of the connection port with the internal space of the isolation container, and it is possible to reduce mutual interference with the position setting of each inlet and outlet. it can. (7) With the configuration in which the separation flange is arranged on a part of the isolation container and the engaging connection part for joining and separating the part is arranged on the partition wall, the collecting pipe and the heat exchange part are separated from the isolation container. It is possible to easily carry out inspections of the brazed part by pulling out and opening the heat exchange part.

[Brief description of drawings]

FIG. 1 is a plan sectional view showing an embodiment of a plate fin heat exchanger according to the present invention.

FIG. 2 is a front sectional view showing an embodiment of a plate fin heat exchanger according to the present invention.

FIG. 3 is an enlarged cross-sectional view of a chain line C portion of FIG.

FIG. 4 is a plan view showing a conventional example of a plate fin heat exchanger.

5 is a view taken along the line EE of FIG.

[Explanation of symbols]

 2 Side Blocks 3 Separation Plates 4 Corrugated Fins 5 Heat Exchange Channels 6 High Temperature Channels (High Temperature Fluid Channels) 7 Low Temperature Channels (Low Temperature Fluid Channels) 6a ・ 7a Small Channels 8 Front Plate 9 Connection Flow Channel 10A / 10B Header for high temperature fluid merging (inlet / outlet) 11A ・ 11B Header for low temperature fluid merging (inlet / outlet) 20 Isolation container 21 Heat exchange section 22 Collecting pipe 22a Slit 22b Closing lid 23 Internal space 24 Partition wall 25 Separation flange 26 Engagement Mating connection 27 Mounting bracket

Claims (5)

[Scope of utility model registration request] 1. A heat exchanger comprising: separators arranged at parallel intervals; and corrugated fins formed between the separators to form a plurality of stacked heat exchange channels in parallel.
The heat exchange section is housed inside the isolation container, one of the inlet and outlet of the high temperature fluid and the low temperature fluid is arranged in a connection state with the heat exchange flow path via the collecting pipe that penetrates the isolation container, and the other of the inlet and outlet is A plate fin heat exchanger, wherein the plate fin heat exchanger is arranged so as to be connected to a heat exchange flow path via an internal space of an isolation container. 2. The plate fin heat exchanger according to claim 1, wherein a collecting pipe is arranged at an inlet / outlet port of the high temperature fluid, and an inlet / outlet port of the low temperature fluid is connected to an internal space of the isolation container. 3. The plate fin heat according to claim 1, wherein a partition wall that partitions the internal space of the isolation container is provided between the inner wall of the isolation container and the outer portion of the heat exchange section. Exchanger. 4. The plate fin heat exchanger according to claim 1, wherein the heat exchange passage for the high temperature fluid and the heat exchange passage for the low temperature fluid are arranged in an orthogonal state. 5. A separating flange for dismounting the collecting pipe and the heat exchange part from the separating container is arranged in a part of the isolation container, and an engaging connection part for joining and separating the part in a partition wall. The plate fin heat exchanger according to claim 3 or 4, characterized in that