JP4416076B2 - Joined plate heat exchanger - Google Patents

Description

  The present invention relates to a joining plate type heat exchanger in which cassette plates obtained by permanently joining the peripheral portions of two thin plate plates by laser welding or the like are stacked with a gasket interposed therebetween.

  A general plate heat exchanger has a heat transfer plate in which passage holes through which a first fluid and a second fluid to be subjected to heat flow are formed and a heat transfer surface on the surface are stacked with a gasket interposed therebetween. In addition, a flow path through which the first fluid and the second fluid circulate alternately is formed between the stacked heat transfer plates, and the first fluid and the second fluid pass through the heat transfer surfaces of the plates. Heat exchange is performed.

  On the other hand, as shown in FIG. 3, the joining type plate heat exchanger 1 superimposes two plates 2 and 3, and laminates a cassette plate 5 joined at the periphery thereof via a gasket 6. The first fluid and the second fluid to be heat-exchanged are circulated through the first flow path 7 formed in the cassette plate 5 and the second flow path 8 formed between the cassette plates 5, respectively. The heat exchange is performed.

  Specifically, as shown in FIGS. 3 and 4, the plates 2 and 3 of the cassette plate 5 are substantially rectangular plates, and the two first passage holes 9 and 10 through which the first fluid to be heat-exchanged flow, Two second passage holes 11 and 12 through which the second fluid to be exchanged flow are formed at the four corners, and a heat transfer surface 15 is provided at the center. The cassette plate 5 superimposes the plates 2 and 3 as a set with the first passage holes 9 and 10 and the second passage holes 11 and 12 communicating with each other, and the heat transfer surface 15 and the first passage. The peripheral portions 13 and 14 of the plates 2 and 3 are joined by welding so as to surround the holes 9 and 10 and the second passage holes 11 and 12, respectively. In the joining plate type heat exchanger 1, a gasket 6 is attached to the cassette plate 5 so as to surround the heat transfer surface 15, the second passage holes 11, 12, and the first passage holes 9, 10. 6, the cassette plate 5 is stacked, and frames 17 and 18 are attached and fixed to both ends thereof.

The joining plate heat exchanger 1 circulates a first fluid that exchanges heat through the first passage holes 9, 10 and the first flow path 7 formed in the cassette plate 5, and the second passage hole 11, A second fluid is circulated through a second flow path 8 formed by a gasket 6 between 12 and the cassette plate 5, and heat exchange is performed between the two fluids (Patent Document 2).
Japanese Patent Laid-Open No. 5-79786 (stage 0010, FIG. 1) JP 2002-107087 A

  In the above general plate type heat exchanger, an annular heat-resistant elastic gasket is interposed in the periphery of the plate passage hole to reduce the pressure loss of the fluid flowing through the plate passage hole, thereby improving the flow performance and stacking. The fluid smoothly flows through the flow path formed by the passage hole of the plate (see, for example, Patent Document 1).

  On the other hand, in the junction type plate heat exchanger 1, the second passage holes 11 and 12 whose peripheral portions are joined among the passage holes 9 to 12 of the cassette plate 5 are joined as shown in FIG. In order to ensure the certainty, the second passage holes 11 and 12 of the cassette plate 5 are welded 22 to the hole peripheral part slightly apart from the hole end face 21. For this reason, a slight gap s between the two plates 2 and 3 may be formed in the hole end surface 21 of the second passage holes 11 and 12.

  Especially when used for food applications, if there is such a gap s, the fluid that has entered the gap s will be spoiled and contamination problems will occur. This causes problems such as a decrease in quality, unsanitary conditions, and an increase in maintenance costs.

  The purpose of the present invention is to prevent the formation of a gap in the hole end surface of the second passage hole where the peripheral edge is joined in the joining plate type heat exchanger, and reduce the work frequency of cleaning and sterilization treatment, An object of the present invention is to provide a junction type plate heat exchanger capable of increasing working efficiency.

In order to achieve the above object, the bonded plate heat exchanger according to the present invention has a first passage hole through which a first fluid to be heat-exchanged flows, a second passage hole through which a second fluid flows, and heat transfer. A plate having a surface is superposed as a set of two, and the periphery of the plate is welded so as to surround the heat transfer surface and the first passage hole, and the periphery of the hole apart from the hole end surface of the second passage hole Plate-type heat exchanger in which a plurality of cassette plates formed by welding so as to surround a portion are stacked with a heat transfer surface, a second passage hole, and a gasket surrounding each first passage hole interposed therebetween In the method, the planar portions provided around the second passage holes of the two plates constituting the cassette plate are overlapped with each other, the overlapping portions are joined by welding the peripheral portions of the holes, and the overlapping portions of the overlapping portions are joined together. in welding two passage hole side end portion over the entire circumference If then, characterized in that the sandwich from the plate laminating direction on both sides of gasket polymerization of the cassette adjacent plates.

  According to this joining type plate heat exchanger, the edge of the second passage hole of the cassette plate is joined by welding over the entire circumference, so there is a gap between the hole end surfaces of the second passage holes 11 and 12 to which the peripheral portions are joined. Does not occur. For this reason, this joining type plate type heat exchanger can suppress the work frequency of washing and sterilization treatment, and can raise work efficiency, and is hygienic and suitable for food use.

  For example, a plate including two first passage holes through which a first fluid to be heat-exchanged and two second passage holes through which a second fluid to be heat-exchanged is formed, and having a heat transfer surface, As a set of two sheets, polymerization is performed with the first passage hole and the second passage hole communicating with each other, and the peripheral portion of the plate is welded so as to surround the heat transfer surface, the first passage hole, and the second passage hole, respectively. A plurality of cassette plates formed by joining together with a gasket interposed so as to surround the heat transfer surface, the second passage hole, and the first passage hole, and are formed in the first passage hole and the cassette plate. Joining type for exchanging heat between the first fluid flowing through the first flow path and the second fluid flowing through the second flow path formed by the gasket between the second passage hole and the cassette plate In the plate heat exchanger, the edge of the second passage hole is all around They may be joined by Watari welding.

  In this case, the second passage hole is formed such that one of the two plates of the cassette plate is larger than the hole of the other plate, and the passage holes of the two plates are concentrically aligned. It is good to superpose and join the step which arises in the peripheral part of the passage hole of two plates by welding over the perimeter. In this case, since welding may be performed aiming at the step generated at the peripheral portion of the second passage hole, the joining spot becomes wide, welding can be easily performed, and it becomes easy to fill the gap on the end surface of the second passage hole. .

  In this case, if the step generated at the edge of the second passage hole is filled with a gasket attached to the outer surface of the cassette plate, the flow performance of the fluid flowing through the second passage hole is not impaired.

  In addition, a welding means is not limited, A various well-known method is employable. For example, laser welding, TIG welding (tungsten inert gas welding), or the like can be employed as means for welding the edge of the second passage hole of the cassette plate.

  According to the junction type plate heat exchanger according to the present invention, the gap between the two plates of the cassette plate is welded and closed at the hole end surface of the second passage hole of the cassette plate. Various problems such as contamination caused by the intrusion of fluid into the gap can be solved, the work frequency of cleaning and sterilization treatment can be suppressed, and work efficiency can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected and demonstrated to the same member and site | part as the junction type plate type heat exchanger mentioned above.

  As shown in FIG. 1, the second passage holes 11 and 12 of the cassette plate 5 of the junction plate heat exchanger according to the first embodiment are arranged around the edges 23 of the superposed second passage holes 11 and 12. And the gap s between the two plates of the cassette plate 5 is completely filled. Thus, the hole end surfaces 21 of the second passage holes 11 and 12 are joined with the end surfaces 21a and 21b of the two plates being flush with each other.

  According to the joining plate type heat exchanger using the cassette plate 5, there is no gap s between the two plates 2 and 3 of the superposed cassette plate 5 at the end face 21 of the second passage holes 11 and 12. The contamination problem does not occur in the second passage holes 11 and 12. For this reason, the work frequency of washing and sterilization treatment can be suppressed, and work efficiency can be increased.

  As mentioned above, although the joining type plate type heat exchanger concerning a 1st embodiment was explained, welding of the 2nd passage holes 11 and 12 in a cassette plate is changed into the conventional welding line, and the 2nd passage holes 11 and 12 are changed. Only the edge 23 may be welded over the entire circumference. In this case, it is preferable to ensure the welding reliability of the second passage holes 11 and 12 by setting the joining width of the edges 23 of the second passage holes 11 and 12 to be wide.

  Next, a bonded plate heat exchanger according to the second embodiment will be described.

  In the junction plate heat exchanger according to the second embodiment, the second passage holes 11 and 12 formed in one plate 2 of the two plates 2 of the cassette plate 5 are formed in the other plate 3. The diameter is set larger than the second passage holes 11, 12. The cassette plate 5 overlaps the second passage holes 11 and 12 of the two plates 2 and 3 in a concentric manner and is generated at the peripheral edge of the second passage holes 11 and 12 of the two plates 2 and 3. The step 26 is joined to the entire circumference by welding.

  The joining plate type heat exchanger using the cassette plate 5 has a step 26 on the two plates 2 and 3 of the cassette plate 5 at the peripheral edge of the second passage holes 11 and 12 of the superposed cassette plate 5. Therefore, welding may be performed aiming at the step 26. For this reason, welding aiming at the gap s between the two plates 2 and 3 is easy, and a weld bead is generated at the step 26, so that a welding error is hardly caused.

  In the junction plate heat exchanger of the second embodiment, as in the junction plate heat exchanger of the first embodiment, the end surface 21 of the second passage holes 11 and 12 is provided on the end surface 21 of the cassette plate. There is no gap s between the two plates 2, 3, and the second passage holes 11, 12 do not have a contamination problem.

  Further, in the junction plate type heat exchanger of the second embodiment, as shown in FIG. 2, the step 26 of the second passage holes 11 and 12 is filled with the gasket 6 attached to the outer surface of the cassette plate 5. Good. If the step 26 of the second passage holes 11 and 12 is filled with the gasket 6, the flow performance of the fluid flowing through the second passage holes 11 and 12 is not impaired.

  Note that the plate heat exchanger of the present invention is not limited to the various embodiments described above, and it is needless to say that various modifications can be made without departing from the scope of the present invention.

  Since the present invention is characterized in that the edge of the second passage hole is joined by welding over the entire circumference, for example, the position of the passage hole of the plate cassette, the shape of the flow path, the uneven shape of the heat transfer surface, and the like are various. It can be changed.

The fragmentary longitudinal cross-sectional view of the 2nd channel | path hole of the joining type plate heat exchanger which concerns on 1st Embodiment of this invention. The fragmentary longitudinal cross-section of the 2nd channel | path hole of the joining type plate type heat exchanger which concerns on 2nd Embodiment of this invention. The perspective view which shows the organization of the plate cassette of a joining type plate-type heat exchanger. The front view of a plate cassette. The AA longitudinal cross-sectional view of the 2nd channel | path hole of a joining type plate type heat exchanger.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joining type plate type heat exchanger 2, 3 Plate 5 Cassette plate 6 Gasket 7 1st flow path 8 2nd flow path 9, 10 1st passage hole 11, 12 2nd passage hole 13, 14 Welding line 15 Heat transfer surface 17, 18 Frame 21 Hole end surface 21a, 21b Plate end surface 22 Welding 23 Edge 26 Step s Clearance

Claims (3)

A plate having a first passage hole through which the first fluid to be heat-exchanged flows, a second passage hole through which the second fluid circulates, and a heat transfer surface is polymerized as a pair, and the heat transfer surface A plurality of cassette plates formed by welding the peripheral portions of the plates so as to surround one passage hole and welding them so as to surround the hole peripheral portion away from the hole end surface of the second passage hole, In the joined plate type heat exchanger laminated with the gasket surrounding each of the surface, the second passage hole, and the first passage hole,
The flat portions provided around the second passage holes of the two plates constituting the cassette plate are overlapped with each other, the overlapping portions are joined by welding the peripheral portions of the holes, and the second passages of the overlapping portions are joined. A joint-type plate heat exchanger characterized in that the hole-side end portions are joined by welding over the entire circumference , and a gasket is sandwiched from both sides in the plate stacking direction by overlapping portions of adjacent cassette plates .   The second passage hole is formed such that one of the two plates of the cassette plate is larger than the hole of the other plate, and the passage holes of the two plates are concentrically aligned. The joining type plate heat exchanger according to claim 1, wherein the steps formed at the peripheral edge portions of the passage holes of the two plates are joined by welding over the entire circumference.   The junction type plate heat exchanger according to claim 2, wherein a step formed at an edge of the second passage hole is filled with the gasket.

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