JP3994218B2 - Header structure of plate / fin type heat exchanger and header mounting method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a header structure of a plate-fin type heat exchanger and a method for mounting the header.
[0002]
[Prior art]
As shown in FIGS. 9 and 10, the conventional plate-fin heat exchanger includes a low-temperature fluid inflow header 1 and a heated low-temperature fluid outflow header 2, oblique AC sections 3a provided on the inflow side and the outflow side, and The oblique alternating current section 3b, the high temperature fluid inlet 5 provided in the oblique alternating current section 3b, the high temperature fluid outlet 6 provided in the oblique alternating current section 3a, the low temperature fluid 7 provided between the oblique alternating current section 3a and the oblique alternating current section 3b, It is a rectangular type composed of a counter flow portion 4 that exchanges heat with the high-temperature fluid 8.
[0003]
As shown in FIG. 11, which is an AA cross-sectional view of FIG. 10, FIG. 12 is a BB cross-sectional view of FIG. 10, and FIG. 13 is a perspective view of each member. And a first separator 9a (FIG. 13 (a)) provided with two holes 23a and 24a for inserting the two headers 1 and 2, and two holes 23a and 24a for insertion into the cryogenic fluid channel 12a. , The second separator 10a (FIG. 13C) provided with embossed portions 22e and 22f, a heat transfer facilitator 15a for the high-temperature fluid channel 13a, and two oblique channel members 20a and 21a ( (D)) of FIG. 13 is repeated to stack two or more stages, and in many cases 80 or more stages, on which the first separator 9a and the heat transfer facilitator 14a for the low-temperature fluid flow path 12a and two are stacked. Of the oblique flow path members 18a and 19a ((b) of FIG. 13) A plate-shaped third separator 11a (FIG. 13 (e)) provided with holes 23a and 24a for inserting the headers 1 and 2 is stacked, and a reinforcing member 26 is inserted between the separators 9a and 10a. Further, covers 16 and 17 having two header mounting holes 23 and 24 on the upper and lower sides are overlapped.
[0004]
The separators 9a and 10a, the heat transfer promoting bodies 14a and 15a, and the covers 16 and 17 are laminated while brazing a brazing material between them in advance. Necessary for brazing after lamination. The laminated body 27 is configured by melting the brazing material in a high-temperature vacuum furnace while applying pressure in the laminating direction and bonding the members together. The separators 9a and 10a are joined to each other by welding the peripheral part and the inner peripheral part of the low temperature side fluid inlet / outlet part, and each flow path is partitioned by the separators 9a and 10a so that fluids do not mix with each other. .
[0005]
As described above, the header mounting holes 23 and 24 of the covers 16 and 17 in the laminated body 27 bonded together as described above are manufactured separately from the laminated body 27 and closed at one end. And the low-temperature fluid outflow header 2 is inserted from the upper and lower sides, and the headers 1 and 2 are hermetically fixed to the header mounting holes 23 and 24 of the covers 16 and 17 by welding 30, respectively. A mold heat exchanger is configured.
[0006]
As shown in FIGS. 14 and 15, the headers 1 and 2 are provided with a window-like fluid inlet / outlet channel 28 on the entire circumferential side surface in order to distribute the fluid to the respective cryogenic fluid channels 12 a. At this time, in order to distribute the fluid uniformly, the headers 1 and 2 need to have a large fluid inlet / outlet flow path 28, but have sufficient strength to prevent expansion and deformation of the plate-fin heat exchanger. Therefore, the fluid inlet / outlet channel 28 is determined to have an optimum size.
[0007]
Further, what is shown in FIG. 16 is one in which the shape of the plate-fin heat exchanger is symmetric. Such a symmetrical shape has an advantage that the types of the separators 9a and 10a can be reduced by providing the separators 9a and 10a so as to be reversed. Due to the symmetrical shape, there is an advantage that generation of local thermal stress can be prevented. Further, as another plate fin type heat exchanger, in addition to providing the headers 1 and 2 for the low temperature fluid as described above, it is also possible to provide a header on the high temperature fluid side. Further, as shown in FIGS. 14 and 15, an annular stay 29 having header mounting holes 23, 24 is fixed to the covers 16, 17 to increase the strength of the connecting portion between the laminate 27 and the headers 1, 2. Something like that is also considered.
[0008]
In the conventional plate-fin type heat exchanger described above, the low-temperature fluid 7 that has entered the oblique flow path member 18a of the low-temperature fluid flow path 12a from the header 1 flows into the diagonal flow path member 13a of the high-temperature fluid flow path 13a. The high-temperature fluid 8 heated by the high-temperature fluid 8 entering from the inlet 5 of 20a flows out of the header 2 through the slant flow-path member 19a of the low-temperature fluid flow path 12a, and the high-temperature fluid 8 after the heat exchange is finished in the high-temperature fluid flow path 13a. It flows out from the outlet 6 of the oblique flow path member 21a.
[0009]
[Problems to be solved by the invention]
In the conventional rectangular plate and fin heat exchanger, when the headers 1 and 2 are attached to the laminate 27, the headers are attached to the header mounting holes 23 and 24 provided in the covers 16 and 17 or the stay 29 of the laminate 27. After inserting 1 and 2 from one side, the headers 1 and 2 are fixed to the header mounting holes 23 and 24 on both sides by welding.
[0010]
However, the header mounting holes 23 and 24 provided in the covers 16 and 17 or the stay 29 have a diameter slightly larger than the outer diameter of the headers 1 and 2 by a welding allowance (about 1 to 3 mm). Only.
[0011]
On the other hand, when the laminated body 27 is manufactured integrally by lamination and brazing, even if the position management of each member is strictly performed, the positions of the covers 16 and 17 in the lamination direction, the covers 16, 17 or The axis lines of the header mounting holes 23 and 24 provided in the stay 29 are out of order. Causes of such deviation include manufacturing errors of the separators 9a, 10a, and 11a and the heat transfer promoting bodies 14a and 15a, slight displacement during stacking, separators 9a, 10a, and 11a and heat transfer during brazing. It is conceivable that the brazing material sandwiched between the promoting bodies 14a and 15a melts, and the separators 9a, 10a and 11a and the heat transfer promoting bodies 14a and 15a become slightly free and misaligned. Such a tendency of occurrence of deviation becomes larger as the number of stacked stages becomes larger.
[0012]
If the headers 1 and 2 are inserted and fixed from one side into the header mounting holes 23 and 24 of the laminated body 27 in which an error due to such a shift has occurred, the header mounting of the cover 16 or 17 on one side or the header of the stay 29 is performed. There may occur a case in which the leading ends of the headers 1 and 2 passing through the holes 23 and 24 are stopped by the other covers 16 and 17 or the stay 29 and cannot pass through the header mounting holes 23 and 24 on the other side.
[0013]
When such a situation occurs, it is necessary to grind the header mounting holes 23 and 24 on the other side and to perform alignment many times until the leading ends of the headers 1 and 2 can penetrate the header mounting holes 23 and 24. In addition, since the header mounting holes 23 and 24 are ground as described above, the welding between the covers 16 and 17 or the stay 29 and the headers 1 and 2 may be defective. In addition, the method of correcting the header mounting holes 23 and 24 by grinding as described above has a problem in that the time and man-hours required for manufacturing the plate-fin type heat exchanger increase, leading to an increase in cost. .
[0014]
SUMMARY OF THE INVENTION An object of the present invention is to provide a header structure of a plate-fin type heat exchanger and a header mounting method that can simplify the header mounting operation.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, the header structure of the plate-fin type heat exchanger of the present invention is a plate-type heat exchanger in which the header is inserted into the header mounting holes provided on both sides of the laminate and fixed by welding. A header structure of a fin-type heat exchanger, which is inserted into a header mounting hole from one side of the laminate and fixed by welding, and an inner surface of the cylinder through the header mounting hole from the other side of the laminate And a lid that is inserted into the header mounting hole and fixed by welding.
[0016]
The strength guide member may be a radial plate, the cylinder may be provided with a fluid inlet / outlet channel, and the cylinder is not provided with a fluid inlet / outlet channel, and between the tip of the cylinder and the lid. A fluid inlet / outlet channel may be formed.
[0017]
The header mounting method of the plate fin type heat exchanger of the present invention is the header of the plate fin type heat exchanger in which the header is inserted into the header mounting holes provided on both sides of the laminate and fixed by welding. The cylindrical body is inserted into the header mounting hole from one side of the laminate, and the strength guide member provided on the lid is fitted to the inner surface of the cylindrical body through the header mounting hole from the other side of the multilayer body. The lid body is inserted into the header mounting hole on the other side, the cylinder body and the lid body are welded and fixed to the laminated body, and the strength guide member is welded and fixed to the inner surface of the cylinder body.
[0018]
The operation of the above means will be described.
[0019]
In the present invention, even if there is a positional shift in the header mounting hole of the laminated body assembled by laminating and brazing the separator plate and the heat transfer promoting body, the cylinder body and the lid body configured separately are combined into the laminated body. On the other hand, it can be easily assembled by inserting them from opposite sides, so that the assembly work of the plate-fin heat exchanger can be performed efficiently.
[0020]
In addition, since the strength guide member of the lid is fitted to the cylinder and fixed by welding, the strength of the header is increased by the strength guide member and the strength of the plate-fin heat exchanger is improved. Can be made.
[0021]
Furthermore, when the strength guide member is formed of a radial plate, there is no problem that the strength guide member impedes fluid flow.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to FIGS. 1 is a perspective view for explaining an embodiment for carrying out the present invention, FIG. 2 is a cross-sectional view of the header installation portion of FIG. 1 according to the present invention, and FIG. 3 is a plan view seen from the III-III direction of FIG. It is.
[0023]
The embodiment shown in FIG. 1 to FIG. 3 includes headers 1 and 2 that are inserted into the header mounting holes 23 and 24 provided in the covers 16 and 17 or the stay 29 constituting the laminated body 27. Is formed of a cylindrical body 31 and a lid body 32. The cylinder 31 and the lid 32 can be fitted to the header mounting holes 23 and 24 with a slight gap.
[0024]
On the upper surface of the lid 32, an intensity guide member 33 made of a radial plate 33 a extending in a required length is provided integrally above the inner surface of the cylindrical body 31.
[0025]
In order to fix the headers 1 and 2 to the laminated body 27, the cylindrical body 31 is inserted into the header mounting holes 23 and 24 from one side of the laminated body 27 (from the upper side in FIGS. Is inserted into the header mounting holes 23 and 24 from the other side of the laminated body 27 (from the lower side in FIGS. 1 and 2), and the strength guide member 33 of the lid body 32 is fitted inside the cylindrical body 31. At this time, a required interval is maintained so that a required fluid inlet / outlet channel 28 is formed between the lower end of the cylindrical body 31 and the lid 32.
[0026]
Next, the cylinder 31 and the lid 32 are fixed to the header mounting holes 23 and 24 of the laminated body 27 by welding 30, and the strength guide member 33 of the lid 32 is attached to the inner surface of the cylinder 31. It is fixed by welding 34 from the inside of 31. As a result, a plate-and-fin heat exchanger in which the headers 1 and 2 are fixed to the laminate 27 can be configured. Although the illustrated strength guide member 33 is configured by only the radial plate 33a, for example, a small-diameter pipe or bar is fixed to the center and the radial plate 33a is attached to the outer periphery thereof. May be.
[0027]
FIG. 4 shows another example of the embodiment shown in FIGS. 1 to 3, in which a plurality of communication holes 35 are provided in the strength guide member 33. Providing the communication holes 35 has an effect of improving the fluid flow distribution.
[0028]
FIGS. 5 to 8 show an embodiment different from those shown in FIGS. 1 to 3. In FIGS. 5 to 8, the headers 1 and 2 are provided, and the fluid inlet / outlet channel 28 is provided near one end. A cylindrical body 36 and a lid body 37 are provided. The cylinder 36 and the lid 37 can be fitted to the header mounting holes 23 and 24 with a slight gap.
[0029]
On the upper surface of the lid body 37, a strength guide member 38 made of a radial plate 38a that can be fitted to the inner surface of the cylindrical body 36 is integrally provided. The strength guide member 38 has a shorter length than the strength guide member 33 shown in FIGS.
[0030]
In order to fix the headers 1 and 2 to the laminated body 27, the cylindrical body 36 is inserted into the header mounting holes 23 and 24 from one side of the laminated body 27 (from the upper side in FIG. 7), while the lid 37 is placed on the laminated body. 27 is inserted into the header mounting holes 23 and 24 from the other side (from the lower side in FIG. 7), and the strength guide member 38 of the lid 37 is fitted inside the cylinder 36.
[0031]
Next, the cylinder body 36 and the lid body 37 are fixed to the header mounting holes 23 and 24 of the laminated body 27 by welding 30, and the strength guide member 33 of the lid body 32 is attached to the inner surface of the cylinder body 31. It is fixed by welding 34 from the inside of 31. As a result, a plate-and-fin heat exchanger in which the headers 1 and 2 are fixed to the laminate 27 can be configured.
[0032]
As described above, the cylinders 31 and 36 are inserted into the header mounting holes 23 and 24 from one side of the multilayer body 27 and fixed to the upper header mounting holes 23 and 24 by welding 30, and from the other side of the multilayer body 27. The strength guide members 33 and 38 provided in the lid bodies 32 and 37 are fitted to the inner surfaces of the cylindrical bodies 31 and 36 through the header attachment holes 23 and 24, and the lid bodies 32 and 37 are fitted to the header attachment holes 23 and 24 on the other side. Then, the lid bodies 32 and 37 are fixed to the lower header mounting holes 23 and 24 by welding 30, and the cylindrical bodies 31 and 36 and the strength guide members 33 and 38 of the lid bodies 32 and 37 are welded 34. Since the header mounting holes 23 and 24 of the laminated body 27 assembled by laminating and brazing the separator and the heat transfer facilitating member are vertically displaced, they are configured separately. The cylinders 31 and 36 and the lid bodies 32 and 37 are laminated. It can be assembled easily inserted from opposite sides relative to 7, thus it is possible to perform the assembling operation of the plate-fin heat exchanger efficiently. At this time, the strength guide members 33 and 38 act as guides for fitting the cylindrical bodies 31 and 36 and the lid bodies 32 and 37 together.
[0033]
In addition, since the strength guide members 33 and 38 of the lid bodies 32 and 37 are fitted to the cylindrical bodies 31 and 36 and fixed by welding 34, the strength guide members 33 and 38 allow the headers 1 and 2 to be fixed. The strength can be increased and the strength of the plate-fin heat exchanger can be improved.
[0034]
It should be noted that the present invention is not limited to the illustrated embodiments, and it is needless to say that various modifications can be made without departing from the gist of the present invention.
[0035]
Further, when the strength guide members 33 and 38 are configured by the radial plates 33a and 38a, the strength guide members 33 and 38 do not cause a problem that obstructs the flow of fluid.
[0036]
【The invention's effect】
According to the present invention, even if there is a misalignment in the header mounting hole of the laminated body assembled by laminating and brazing the separator and the heat transfer promoting body, the separately configured cylinder and lid are laminated. It can be easily assembled by inserting the body from opposite sides, and therefore, there is an effect that the assembly work of the plate-fin heat exchanger can be efficiently performed.
[0037]
In addition, since the strength guide member of the lid is fitted to the cylinder and fixed by welding, the strength of the header is increased by the strength guide member and the strength of the plate-fin heat exchanger is improved. There is an effect that can be made.
[0038]
Furthermore, when the strength guide member is formed of a radial plate, there is no problem that the strength guide member impedes fluid flow.
[Brief description of the drawings]
FIG. 1 is a perspective view of an embodiment for carrying out the present invention.
FIG. 2 is a cross-sectional view of the header installation portion of FIG.
3 is a plan view seen from the III-III direction of FIG.
4 is a side view showing another example of FIG. 1. FIG.
FIG. 5 is a perspective view showing a state in which a cylinder body and a lid body are assembled, which shows another example of the embodiment for carrying out the present invention.
6 is a perspective view showing a state in which the cylindrical body and the lid body of FIG. 5 are assembled. FIG.
7 is a cross-sectional view of a header installation portion to which the header of FIGS. 5 and 6 is applied. FIG.
8 is a sectional view taken along line VIII-VIII in FIG.
FIG. 9 is a perspective view of a conventional plate-fin heat exchanger.
10 is a plan view of the plate-fin heat exchanger of FIG.
11 is a cross-sectional view taken along the line AA in FIG.
12 is a cross-sectional view taken along the line BB in FIG.
FIGS. 13A, 13B, 13C, 13D, and 13E are perspective views of each member of the plate-fin heat exchanger.
FIG. 14 is a cross-sectional view of a header installation portion in a conventional plate-fin heat exchanger.
15 is a cross-sectional view seen from the XV-XV direction of FIG.
16 is a perspective view seen from the XV-XV direction of FIG.
[Explanation of symbols]
1, 2 Header 23, 24 Header mounting hole 27 Laminate 28 Fluid inlet / outlet flow path 30 Welding 31, 36 Cylindrical body 32, 37 Lid 33, 38 Strength guide members 33a, 38a Radial plate 34 Welding

Claims (5)

It is a header structure of a plate-fin type heat exchanger in which the header is inserted into the header mounting holes on both sides of the laminate and fixed by welding, and inserted into the header mounting holes from one side of the laminate. A cylindrical body that is fixed by welding and a strength guide member that fits into the inner surface of the cylindrical body from the other side of the laminated body through the header mounting hole, and is inserted into the header mounting hole and fixed by welding. A plate-fin type heat exchanger header structure, comprising: The header structure according to claim 1, wherein the strength guide member is a radial plate. The header structure according to claim 1 or 2, wherein the cylinder includes a fluid inlet / outlet channel. 3. The header structure according to claim 1, wherein the cylinder does not include a fluid inlet / outlet channel, and a fluid inlet / outlet channel is formed between the tip of the cylinder and the lid. A method of mounting a header of a plate-fin type heat exchanger in which a header is inserted into a header mounting hole provided on both sides of a laminate and fixed by welding, and the header mounting hole is provided from one side of the laminate. The cylinder is inserted into the cylinder, the strength guide member provided in the lid is fitted to the inner surface of the cylinder through the header mounting hole from the other side of the laminate, and the lid is inserted into the header mounting hole on the other side. A plate and fin type heat exchanger header mounting method, wherein a body and a lid are welded and fixed to a laminate, and the strength guide member is welded and fixed to an inner surface of a cylindrical body.

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