JPH0552566U - Plate fin heat exchanger - Google Patents

Abstract

(57) [Abstract] [Purpose] A plate fin heat exchanger is used to reduce the temperature gradient applied to the header mounting portion and reduce the generated thermal stress. [Structure] By providing a heat insulating chamber that is isolated from the high temperature passage and the low temperature passage between the headers for the high temperature fluid and the header for the low temperature fluid that are adjacent to each other, the fluids with large temperature differences are in the vicinity of the same header. Avoid distribution in.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a plate fin heat exchanger, and more particularly to a technique for reducing thermal stress generated in a header mounting portion.

[0002]

[Prior Art]

 2 and 3 show a structural example of a conventional plate fin heat exchanger. In the figure, reference numeral 1 is a casing, reference numeral 2 is a side block, reference numeral 3 is a separator, reference numeral 4 is a corrugated fin, reference numeral 5 is a heat exchange passage, reference numeral 6 is a high temperature passage, reference numeral 7 is a low temperature passage, Reference numerals 6a and 7a are small flow paths, reference numeral 8 is both front plates, reference numeral 9 is a connection flow path, reference numeral 10A is a high temperature fluid inlet header, reference numeral 10B is a high temperature fluid outlet header, and reference numeral 11A is a low temperature fluid inlet header. 11B is a cryogenic fluid outlet header.

In the plate fin heat exchanger having such a structure, the high temperature fluid is inserted from the high temperature fluid inlet header 10A to the high temperature fluid outlet header 10B as indicated by the solid arrow in FIG. The low temperature fluid is inserted from the fluid inlet header 11A toward the low temperature fluid outlet header 11B as shown by the broken line arrow in FIG. 2 to perform heat exchange. 5 and the connection flow path 9 increase the contact area between the corrugated fins 4 and the fluid to improve the heat exchange efficiency, thereby enabling downsizing and other general heat generation. Since the heat exchange efficiency is higher than that of the exchanger, it is considered suitable for heat exchange, for example, when the first fluid is a gas in a high temperature state.

[0004]

[Problems to be solved by the device]

 By the way, in such a plate fin heat exchanger, the heat exchanger can be downsized on the basis of high heat exchange efficiency, but in order to secure an effective heat transfer section in such a downsized casing. The high temperature fluid inlet header 10A and the low temperature fluid outlet header 11B, and the high temperature fluid outlet header 10B and the low temperature fluid inlet header 11A are welded and attached to adjacent positions of the adjacent surfaces of the casing, respectively. However, since a high-temperature fluid and a low-temperature fluid having a temperature difference of about 200 ° C. flow at the same time in the vicinity of this mounting portion, they may be damaged by thermal stress.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to alleviate a temperature difference in a mounting portion of a header and reduce a thermal stress generated in the mounting portion. It is a thing.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention comprises a high temperature channel and a low temperature channel formed by stacking separators arranged at parallel intervals and corrugated fins arranged between them. A plate fin heat exchanger formed by arranging a plurality of heat exchange flow paths in parallel, wherein a high temperature fluid header connected to both ends of the high temperature flow path and a low temperature fluid connected to both ends of the low temperature flow path Provided is a plate fin heat exchanger in which a heat insulating chamber that is isolated from the high temperature passage and the low temperature passage is arranged between the header and the header.

[0007]

[Action]

 The high-temperature fluid passes through the high-temperature passage through the high-temperature fluid headers at both ends of the high-temperature passage. Then, the low-temperature fluid is inserted through the low-temperature fluid header through the low-temperature fluid header in a laminated state through the low-temperature fluid header, and heat exchange is performed between these insertions. Due to the adiabatic chamber installed between the header for high temperature fluid and the header for low temperature fluid, it is possible to prevent two fluids with a large temperature difference from flowing in the vicinity of the same header at the same time, and to attach them to the header mounting part The resulting temperature gradient becomes gentle.

[0008]

【Example】

 An embodiment of the plate fin heat exchanger according to the present invention will be described below with reference to FIG. In the present embodiment, the portions having the same configurations as those of the conventional plate fin heat exchanger shown in FIGS. 2 and 3 are designated by the same reference numerals to simplify the description.

In FIG. 1, reference numeral 21 is a high temperature fluid inlet header, reference numeral 22 is a high temperature fluid outlet header, reference numeral 23 is a flow expanding portion, reference numeral 24 is a contracting portion, reference numeral 25 is a heat insulating chamber, reference numeral 26 is a partition fin, Reference numeral 27 is a reinforcing fin, reference numeral 28 is a low temperature header side welding portion, and reference numeral 29 is a high temperature header side welding portion.

The plate fin heat exchanger of this embodiment has a high temperature formed by arranging corrugated fins 4 between separator plates 3 which are arranged inside the rectangular parallelepiped casing 1 at parallel intervals. The flow passages 6 and the low temperature flow passages 7 are alternately arranged in a laminated state, and a high temperature fluid inlet header 21 and a high temperature fluid outlet header 22 are provided on a pair of facing surfaces at both ends of the casing 1 in the longitudinal direction, and other facing surfaces are provided. The low temperature fluid inlet header 11A and the low temperature fluid outlet header 11B are arranged in diagonal positions, the low temperature fluid inlet header 11A is brought close to the high temperature fluid outlet header 22, and the low temperature fluid outlet header 11B is moved to the high temperature fluid inlet header 21. It is common to the conventional example shown in FIG. 2 in that they are arranged close to each other. However, the mounting widths of the high-temperature fluid inlet header 21 and the high-temperature fluid outlet header 22 are set to be smaller than the width dimension of the casing 1, respectively, and they are separated from each other so as to be spaced apart from the low-temperature fluid outlet header 11B and the low-temperature fluid inlet header 11A. Is different from the conventional example in that the heat insulating chamber 25 is formed between the low temperature fluid inlet header 11A and the low temperature fluid outlet header 11B and the high temperature passage 6.

The heat insulating chamber 25 partitions a part of the high temperature passage 6 from the low temperature header side welded portion 29 of the high temperature fluid inlet header 21 and the high temperature fluid outlet header 22 to the low temperature fluid header 11A / 11B mounting surface. It is a space having a triangular cross section formed in a corner portion of the casing 1 by being partitioned by.

The reinforcing fins 27 are a plurality of fins provided in the heat insulating chamber 25 in parallel with the partition fins 26, and are formed by using an integral corrugated plate together with the flow spreading portion 23 and the partition fins 26. And functions as a rib that reinforces the casing 1.

The flow expanding portion 23 is a part of the high temperature flow path 6, and the heat insulating chamber 25 having a triangular cross section expands the flow path width from the width of the high temperature fluid inlet header 21 to the width of the casing 1. It is a part formed so as to do.

The contracting portion 24 is formed in the same manner as the expanding portion 23 so as to reduce the passage width from the width of the casing 1 to the width of the high temperature fluid outlet header 22. Department.

According to the plate fin heat exchanger configured as described above, the high-temperature fluid enters the high-temperature flow passages 6 in the casing 1 from the high-temperature fluid inlet header 21, passes through the widening portion 23, and then flows into the casing 1. After passing through the high-temperature flow path 6 having the same width as the width dimension, the high-temperature fluid outlet header 22 joins the high-temperature fluid outlet header 22 through the contracting portion 24, and the high-temperature fluid outlet header 22 discharges it to the outside.

On the other hand, the low-temperature fluid flows backward from the high-temperature fluid through the connection flow path 9 that flows in a direction orthogonal to the high-temperature fluid from the low-temperature fluid inlet header 11A provided on the surface adjacent to the high-temperature fluid outlet header 22. After passing through the low temperature flow passage 7 flowing in the direction, the low temperature fluid outlet header 11B provided on the surface adjacent to the high temperature fluid inlet header 21 through the connection flow passage 9 merges and discharges to the outside.

Here, the high temperature fluid inlet header 21 and the high temperature fluid outlet header 22 are arranged with a space between the low temperature fluid outlet header 11B and the low temperature fluid inlet header 11A, and the low temperature fluid headers 11A and 11B and the high temperature flow path. Since the heat insulation chamber 25 is provided between the low temperature fluid header 11A and 11B, the high temperature fluid does not flow around the low temperature fluid headers 11A and 11B. The temperature gradient applied to the welded portion 29, particularly to the high temperature header side welded portion 29, is relaxed.

When the heat insulating chamber 25 is provided between the low temperature flow passage and the high temperature fluid headers 21 and 22 in the same manner as described above, it is provided to the low temperature header side welded portion 28 of the high temperature fluid headers 21 and 22. The temperature gradient will be alleviated.

Further, since the casing 1 is not limited to the rectangular parallelepiped shape, the heat insulating chamber 25 is not limited to one having a triangular cross section, and the high temperature fluid is in the low temperature fluid headers 11A and 11B or the low temperature fluid is the high temperature fluid. Any shape may be used as long as it is provided so as not to come into direct contact with the mounting portion of the headers 21 and 22.

[0020]

[Effect of the device]

 As described in detail above, according to the plate fin heat exchanger of the present invention, the heat insulation chamber that is isolated from the high temperature passage and the low temperature passage is provided between the high temperature fluid header and the low temperature fluid header. Since the two fluids having a large temperature difference are prevented from flowing in the vicinity of the header at the same time, the temperature gradient applied to the header mounting portion is relaxed, and the heat applied to the header mounting portion is thereby reduced. The stress can be reduced.

[Brief description of drawings]

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

FIG. 2 is a partially cutaway plan view showing a conventional example of a plate fin heat exchanger.

3 is a view taken along the line DD of FIG.

[Explanation of Codes] 3 Separation Plate 4 Corrugated Fin 5 Heat Exchange Flow Path 6 High Temperature Flow Path 7 Low Temperature Flow Path 9 Connection Flow Path 11A Low Temperature Fluid Inlet Header 11B Low Temperature Fluid Outlet Header 21 High Temperature Fluid Inlet Header 22 High Temperature Fluid Outlet Header 23 Expanding part 24 Contracting part 25 Insulation chamber 26 Partition fin 27 Reinforcing fin 28 Low temperature header-side welded part 29 High temperature header-side welded part

Claims (1)

[Scope of utility model registration request] 1. A plurality of heat exchange passages, which are high temperature passages and low temperature passages, are formed in parallel and are formed by stacking separators arranged at parallel intervals and corrugated fins arranged between them. A plate fin heat exchanger comprising, between a high temperature fluid header connected to both ends of the high temperature channel and a low temperature fluid header connected to both ends of the low temperature channel, a high temperature channel and A plate fin heat exchanger, characterized in that a heat insulating chamber in an isolated state is arranged with respect to the low temperature passage.