JP2003106781A - Welded plate type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welded plate type heat exchanger capable of exchanging heat of a fluid uniformly. SOLUTION: The welded plate type heat exchanger 30 is characterized by that plates 14, 14' are further laminated on both sides of a lamination direction of a plate cassette 12, and a second fluid distribution passage L2 for circulating a second fluid for exchanging heat is further formed on an outer side of the plate cassettes 12a, 12b on both ends. Thereby, a first fluid circulating in a first fluid distribution passage L1 in the plate cassettes 12a, 12b on both of the ends can exchange heat with the second fluid circulating in the second fluid distribution passage L2 on both sides as like the first fluid passing the first fluid distribution passage L1 in the other plate cassette 12. Thus, more uniform heat exchange can be performed.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding type plate heat exchanger. FIG. 2 is a perspective view showing an exploded view of a general welded plate type heat exchanger 10. As shown in FIG. As shown in FIG. 2, the welding type plate heat exchanger 10 has a plurality of plate cassettes 12 stacked with a gasket 11 interposed therebetween, and allows a first fluid to be subjected to heat exchange to flow through the plate cassettes 12. The second fluid for heat exchange is circulated between the plate cassettes 12 to perform heat exchange between the two. More specifically, as shown in FIG. 3, the plate cassette 12 has two plates 14 having a heat transfer surface 13 on the surface.
Are superimposed and welded along a predetermined welding line set on the periphery. Each plate 14 is formed of a rectangular flat plate, and has a corrugated heat transfer surface 13 on its surface.
Is formed. At four corners of the plate 14, a welding side passage hole 15 and a gasket side passage hole 16 serving as a fluid inlet / outlet are opened in pairs. Plate cassette 12,
The plates 14 are superposed as a set of two plates, and a welding line W set as shown by a dotted line in FIG.
Along, two plates 14 are welded by laser welding or the like. Thus, a first fluid distribution passage L1 through which the first fluid for heat exchange flows is formed inside the two plates 14. The welding line W communicates the welding-side passage hole 15 with the first fluid distribution passage L1 formed inside the plate cassette 12, and the gasket-side passage 16 and the first fluid distribution passage L
It is set so that 1 is cut off twice. [0004] Outside the plate cassette 12, a gasket line G for mounting the gasket 11 on the periphery is set as shown by a dashed line in FIG. The gasket line G includes the gasket-side passage hole 16 and the plate cassette 12.
The second fluid distribution passage L2 formed on the outer side of the first fluid distribution passage L2 is communicated, and the welding side passage hole 15 and the second fluid distribution passage L2 are double-blocked. The gasket line G is provided with a gasket 11 made of a heat-resistant elastic material such as synthetic rubber. As shown in FIG. 2, the welded plate type heat exchanger 10 has a gasket 11 mounted on a gasket line G, and a plurality of plate cassettes 12 are stacked, and two frames 18 from both sides in the stacking direction. , 19 and joined together. Thereby, as shown in FIGS. 4 (a) and 4 (b), the welding-side passage hole 15 and the gasket-side passage hole 16 of each plate cassette 12 communicate with each other, and the gasket 11 seals between the plate cassettes 12. A second fluid distribution passage L2 is formed. This welded plate heat exchanger 10 is shown in FIG.
As shown in (a) and (b), the plate cassette 12 is formed by the m-th plate and the (m + 1) -th plate (m is an odd number), and the m-th plate and the (m + 1) -th plate A first fluid distribution passage L1 is formed between the first and second plates, and a second fluid distribution passage L2 is formed between the (m-1) th plate and the mth plate. The welded plate heat exchanger 10 is configured as described above, and as shown in FIG.
5 through the first fluid distribution passage L1 formed in the plate cassette 12, heat-exchanged first fluid flows therethrough. As shown in FIG.
A second fluid distribution passage L2 formed between
And heat exchange between the two fluids. The first fluid distribution passage L1 formed in the plate cassette 12 of the welded plate heat exchanger 10 is formed by welding the pair of plates 14 constituting the plate cassette 12 by welding. The sealing performance is very stable even for fluids such as chemicals. Therefore, the welding type plate heat exchanger 10 is the first type in the plate cassette 12.
In the fluid distribution passage L1, a fluid such as a chemical such as a rubber gasket, whose sealing property is impaired, is circulated as the first fluid for heat exchange, and is cooled in the second fluid distribution passage L2 between the plate cassettes 12. It is suitable for applications in which water is circulated as a second fluid for heat exchange to cool chemicals. Incidentally, in consideration of the production efficiency of the plate cassette 12, the plate cassette 12 has a plate 14 having holes 15 and 16 formed at all four corners. In other words, when polymerizing the plate 14 in the plate cassette 12,
There is no need to worry about the knitting of 14, and the plate cassette 12 can be constituted by any of the plates 14. Further, the frame 18 mounted on the front side in the laminating direction of the laminated body of the plate cassette 12 is shown in FIG.
As shown in (b), since the inlet and outlet for the fluid are formed in the welding-side passage hole 15 and the gasket-side passage hole 16,
Nozzles 21 and 22 communicating with the welding side passage hole 15 and the gasket side passage hole 16 are formed at the corners. Similarly, nozzles 23 and 24 communicating with the welding side passage hole 15 and the gasket side passage hole 16 are formed at four corners of the frame 19 mounted on the rear side. Then, the nozzles 23 and 24 of the rear frame 19 are
A gasket 25 and a closing flange 26 are attached for sealing. As shown in FIGS. 4 (a) and 4 (b), the welded plate type heat exchanger 10 having the above structure has only one side in the plate cassettes 12a and 12b at both ends. The second fluid distribution passage L2 is not formed. Therefore, the fluid flowing through the first fluid distribution passage L1 in the plate cassettes 12a and 12b at both ends has insufficient heat exchange as compared with the fluid flowing through the first fluid distribution passage L1 in the other plate cassettes 12. There is a possibility,
There has been a problem that uniform heat exchange cannot be performed with the fluid. Further, when a high-temperature fluid is allowed to flow through the first fluid distribution passage L1, the frames 18, 19 at both ends of the welded plate heat exchanger 10 become hot, which may be dangerous. Also,
Considering the use of the hot water after the heat exchange, there is a problem that the heat exchange of the fluid flowing through the first fluid distribution passage L1 in the plate cassettes 12a and 12b at both ends is insufficient, and the loss of the radiation energy is large. Was. Accordingly, an object of the present invention is to provide a welded plate heat exchanger capable of performing more uniform heat exchange of a fluid. [0011] A welded plate heat exchanger according to the present invention is obtained by laminating a plurality of plate cassettes in which two plates are overlapped and their peripheral edges are welded with a gasket interposed therebetween. A first fluid for heat exchange in the plate cassette, and a second fluid for heat exchange between the plate cassettes. A plate is further laminated on one side, and the second fluid is caused to flow between the plate cassettes at both ends and the laminated plate. According to this welded plate heat exchanger, the first fluid flowing through the fluid distribution passages in the plate cassettes at both ends is further formed with a fluid distribution passage through which the second fluid flows, so that other Through the fluid distribution passage in the plate cassette of
Since heat exchange similar to that of the first fluid is performed, more uniform heat exchange can be performed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a welded plate type heat exchanger according to an embodiment of the present invention will be described with reference to the drawings.
The same members and the same portions as those of the above-described welded plate heat exchanger 10 are denoted by the same reference numerals. This welded plate type heat exchanger 30 is shown in FIG.
(a) As shown in (b), a gasket 11 is further attached to both sides of the laminated body of the plate cassette 12, plates 14 and 14 'are laminated, and these are superimposed on two frames 18, 19'. It is. This welded plate heat exchanger 30 is shown in FIG.
As shown in (a) and (b), the plate cassette 12 is formed by the (n + 1) th plate and the (n + 2) th plate (n is an odd number). A first fluid distribution passage L1 is formed between the + 2nd plate and the second fluid distribution passage L1 between the nth plate and the (n + 1) th plate.
2 are formed. The welded plate heat exchanger 30 is configured as described above, and as shown in FIG. 1B, the plate cassettes 12a and 12b at both ends and the plate 1
A second fluid distribution passage L2 through which the second fluid for heat exchange flows is further formed between the second fluid distribution passage L2 and the second fluid distribution passage L2. This allows
As shown in FIG. 1 (a), the first fluid to be subjected to heat exchange flows from the welding side passage hole 15 to the first fluid distribution passage L1 formed in the plate cassette 12, as shown in FIG. 1 (b). Then, heat is exchanged with the second fluid distribution passage L2 formed between the gasket-side passage hole 16 and the plate cassette 12, and between the plate cassettes 12a and 12b at both ends and the plates 14 and 14 'stacked on the outside thereof. The second fluid is circulated to perform heat exchange between the two fluids. According to the welding type plate heat exchanger 30, since the plates 14 are further laminated on both sides of the laminated body of the plate cassette 12, the plate cassettes 12a, 12b at both ends are provided.
A second fluid distribution passage L2 through which a second fluid for heat exchange flows is further formed outside. As a result, the first fluid flowing through the first fluid distribution passage L1 in the plate cassettes 12a and 12b at both ends is the same as the first fluid passing through the first fluid distribution passage L1 in the other plate cassettes 12. Since heat exchange is performed with the second fluid passing through the second fluid distribution passage L2, more uniform heat exchange can be performed. As shown in FIGS. 1 (a) and 1 (b), a plate 14 'mounted on the rear side in the direction of fluid flow in the stacking direction of the stack of plate cassettes 12 has a welding side passage hole. 15 and the gasket side passage hole 16 may not be formed, and further the rear frame 19 '
A nozzle without the nozzles 23 and 24 can also be adopted. With this configuration, it is possible to omit the gasket 25 and the closing flange 26 attached in the conventional welded plate heat exchanger 10, and to reduce the manufacturing cost. Although the welded plate heat exchanger according to one embodiment of the present invention has been described above, the welded plate heat exchanger according to the present invention is not limited to the above. For example, the plate to be further laminated may be provided only on one side of the plate cassette in the laminating direction. In addition, when further plates are laminated on only one side in the laminating direction of the plate cassette,
It is preferable to stack the plates 14 'in which the welding side passage hole 15 and the gasket side passage hole 16 are not provided. In this case, since the rear side of the plate cassette in the stacking direction is covered with the plate 14 ', the nozzles 23 and 24, the gasket 25 for sealing, and the closing flange 26 can be omitted from the frame 19 on the rear side. According to the welding type plate heat exchanger according to the present invention, the plates are further laminated on both sides or at least one side in the laminating direction of the plate cassette. Of the second fluid
A fluid distribution passage is formed. Thereby, the first fluid flowing through the first fluid distribution passages in the plate cassettes at both ends is the same as the first fluid passing through the first fluid distribution passages in the other plate cassettes, and the second fluid distribution passages on both sides are also provided. Circulating the
Since heat exchange is performed between the two fluids, more uniform heat exchange can be performed. Further, even when a high-temperature fluid flows through the first fluid distribution passage L1, since the second fluid distribution passages are formed at both ends of the stacked body of the plate cassette, it is possible to prevent the frames at both ends from becoming hot. And the energy loss of the heat radiation energy can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a) is a longitudinal sectional side view showing the vicinity of a welding side passage hole of a welded plate heat exchanger according to the present invention, and (b) is a welded plate according to the present invention. FIG. 4 is a vertical side view showing the vicinity of a gasket-side passage hole of the heat exchanger. FIG. 2 is an exploded perspective view of a conventional welded plate heat exchanger. FIG. 3 is a plan view showing a plate cassette of the welding type plate heat exchanger. 4 (a) is a longitudinal side view showing the vicinity of a welding side passage hole of a conventional welding type plate heat exchanger, and FIG. 4 (b) is the vicinity of a gasket side passage hole of a conventional welding type plate heat exchanger. FIG. [Description of Signs] 30 Welding type plate heat exchanger 11 Gasket 12 Plate cassettes 12a, 12b Plate cassettes 13 at both ends Heat transfer surfaces 14, 14 'Plate 15 Weld side passage hole 16 Gasket side passage hole 18, 19' Frame W Welding line G Gasket line

Claims (1)

Claims: 1. A plurality of plate cassettes in which two plates are overlapped and their peripheral edges are welded are laminated with a gasket interposed therebetween, and a first fluid to be heat-exchanged in the plate cassettes is provided. In the welding type plate heat exchanger, wherein the second fluid to be circulated and heat exchanged between the plate cassettes is circulated, plates are further laminated on both sides or at least one side in the laminating direction of the plate cassettes, The weld-type plate heat exchanger, wherein the second fluid flows between the stacked plates.