JP3682343B2 - Plate heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plate heat exchanger suitable for use in, for example, heat sterilization treatment of liquid food, and more particularly to the shape of a plate heat transfer surface.
[0002]
[Prior art]
In general, a plate-type heat exchanger has a plurality of heat transfer plates stacked to form a plurality of medium flow paths between the plates, and different types of media are alternately circulated through these medium flow paths to transfer heat between the media. Heat exchange is performed via a plate.
[0003]
As a heat transfer plate in this type of plate heat exchanger, those shown in FIGS. 6 and 7 are common.
[0004]
The heat transfer plate 1A shown in FIG. 6 is formed by forming passage holes 3A serving as medium entrances and exits at the four corners of the heat transfer surface 2A, and forming a herringbone corrugation 4A in the middle thereof. 1B is formed by forming passage holes 3B serving as the entrances and exits of the medium at the four corners of the heat transfer surface 2B, and forming corrugated corrugated ribs 4B in the middle thereof.
[0005]
When these heat transfer plates 1A and 1B are turned upside down and stacked, support points (points at which the flanges of adjacent plates abut) S ₁ and S ₂ are generated between the plates. The points S ₁ and S ₂ are distributed over the entire heat transfer surfaces 2A and 2B.
[0006]
[Problems to be solved by the invention]
By the way, in the plate type heat exchanger using the heat transfer plates 1A and 1B, if a medium containing scale flows on the heat transfer surfaces 2A and 2B of the heat transfer plates 1A and 1B, the support points S ₁ and S ₂ Since the scale adheres, accumulates, and grows in the dead flow region that has a low flow velocity generated on the downstream side, the medium flow path is blocked. Further, when the medium includes a fibrous material, the fiber is caught at the support points S ₁ and S _2, and when this grows, the medium flow path is also blocked.
[0007]
If the medium flow path is blocked in this way, maintenance work such as cleaning for performance recovery is required. In addition, if such a phenomenon occurs in a plate heat exchanger for food heating applications, the deposits will be burnt, and the removal of this burn will require physical removal work by disassembling the heat exchanger. It takes a lot of labor and time.
[0008]
The present invention has been proposed in view of such circumstances, and it is an object of the present invention to prevent clogging of a medium flow path by eliminating scale adhesion and fibrous catching.
[0009]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention forms continuous vertical ridges on the heat transfer surface of the heat transfer plate and supports the plates with this continuous ridge.
[0010]
According to the present invention, since the plates are supported by the continuous vertical struts, the support points between the plates become the continuous support lines in the vertical direction, and the fiber is caught in the medium flow path or the scale is attached. Can be eliminated. As a result, clogging of the medium flow path and blockage due to scale adhesion can be prevented. Further, since the gaps between the ribs meander or the widths of the gaps are alternately reduced / expanded, turbulent flow can be generated in the medium to improve the heat transfer performance.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0012]
FIG. 1 shows a heat transfer plate 10A in the plate heat exchanger of the present invention. This heat transfer plate 10A is formed with passage holes 12A serving as medium entrances and exits at four corners of the heat transfer surface 11A, and continuous vertical flanges 13A formed therebetween.
[0013]
In the plate heat exchanger of the present invention, the vertical continuous flange 13A is formed on the heat transfer surface 11A of the heat transfer plate 10A. Therefore, when the heat transfer plate 10A is turned upside down and stacked, as shown in FIG. Further, since the support point S3 between the plates becomes a continuous support line in the vertical direction, there is no starting point where the fiber is caught in the medium flow path or the scale adheres, and clogging or scale adhesion does not occur. The height of the medium flow path formed between the plates can ensure twice the molding depth of the flange 13A, and the cross-sectional area of the medium flow path does not extremely decrease or expand compared to the conventional one. Therefore, it becomes easy for the solid scale to pass through and the blockage of the medium flow path can be prevented.
[0014]
Since there is little clogging and scale adhesion in this way, when used as a heat exchanger using a medium such as seawater or river water that easily adheres to fibers and scales, or as a heat sterilizer for food media that burns due to scale adhesion, It is possible to prevent clogging of the medium flow path and clogging due to scale adhesion. Therefore, maintenance work such as cleaning for performance recovery other than periodic inspection and physical burn-out removal work by disassembling the heat exchanger are unnecessary, and labor and time required for maintenance can be reduced.
[0015]
3 to 5 show heat transfer plates 10B, 10C, and 10D according to other embodiments of the present invention. When all of them are turned upside down, the support point S3 between the plates is a continuous support in the vertical direction. Become a line.
[0016]
That is, the heat transfer plate 10B shown in FIG. 3 is formed by forming passage holes 12B serving as medium entrances and exits at four corners of the heat transfer surface 11B, and forming a vertical continuous ridge 13B in a meandering manner. .
[0017]
A heat transfer plate 10C shown in FIG. 4 has passage holes 12C serving as medium entrances and exits at the four corners of the heat transfer surface 11C, and a continuous vertical flange 13C is formed in the middle, and a plane is formed on the flange 13C. The unevenness is formed so that the width of the ribs decreases and expands alternately.
[0018]
A heat transfer plate 10D shown in FIG. 5 has passage holes 12D serving as medium entrances and exits at the four corners of the heat transfer surface 11D, and a vertical flange 13D is formed in the middle of the passage hole 12D. On the top, the unevenness is formed so that the gaps meander.
[0019]
The heat transfer plates 10B, 10C, and 10D shown in FIGS. 3 to 5 can obtain the same effect as the heat transfer plate 10A of FIG. 1 and also generate turbulent flow in the medium to improve the heat transfer performance. be able to.
[0020]
【The invention's effect】
As described above, according to the present invention, the support point between the plates is used as a support line that is continuous in the vertical direction, and the starting point where the fiber is caught in the medium flow path or the scale adheres is eliminated. Therefore, clogging of the medium flow path and clogging due to scale adhesion can be prevented, and maintenance work such as cleaning for performance recovery other than periodic inspection becomes unnecessary, and labor and time required for maintenance can be reduced.
[0021]
Moreover, if it is used as a heat sterilizer for a medium in which scorching occurs due to scale adhesion, scorching due to scale adhesion can be prevented, and physical scoring removal work by disassembling the heat exchanger becomes unnecessary.
[Brief description of the drawings]
FIG. 1 is a plan view of a heat transfer plate in a plate heat exchanger of the present invention.
FIG. 2 is a schematic cross-sectional view of a state in which the heat transfer plates of FIG. 1 are stacked.
FIG. 3 is a plan view of a heat transfer plate in a plate heat exchanger according to another embodiment of the present invention.
FIG. 4 is a plan view of a heat transfer plate in a plate heat exchanger according to another embodiment of the present invention.
FIG. 5 is a plan view of a heat transfer plate in a plate heat exchanger according to another embodiment of the present invention.
FIG. 6 is a plan view of a herringbone type heat transfer plate in a conventional plate heat exchanger.
FIG. 7 is a plan view of a corrugated heat transfer plate in a conventional plate heat exchanger.
[Explanation of symbols]
10A, 10B, 10C, 10D Heat transfer plates 11A, 11B, 11C, 11D Heat transfer surfaces 12A, 12B, 12C, 12D Passage holes 13A, 13B, 13C, 13D

Claims (3)

In the plate type heat exchanger formed by laminating by alternately turning the heat transfer plate upside down by forming passage holes to be the entrance and exit of the medium at the four corners of the heat transfer surface ,
When the heat transfer plates are alternately turned upside down and stacked, the vertical direction of the heat transfer surface forms a support line in which the flanges of adjacent plates continuously contact each other in the vertical direction to support the plates. And forming multiple continuous folds of
A plate heat exchanger, characterized in that it is formed by meandering so that the width between adjacent scissors is meandering in the vertical direction . In the plate type heat exchanger formed by laminating by alternately turning the heat transfer plate upside down by forming passage holes serving as the entrance and exit of the medium at the four corners of the heat transfer surface,
When the heat transfer plates are alternately turned upside down and laminated, the vertical direction on the heat transfer surface forms a support line in which the flanges of adjacent plates continuously contact each other in the vertical direction to support between the plates. And forming multiple continuous folds of
A plate-type heat exchanger characterized in that the ridges are provided with irregularities on a plane so that the width between adjacent ridges is alternately reduced and enlarged. In the plate type heat exchanger formed by laminating by alternately turning the heat transfer plate upside down by forming passage holes to be the entrance and exit of the medium at the four corners of the heat transfer surface,
When the heat transfer plates are alternately turned upside down and stacked, the vertical direction of the heat transfer surface forms a support line in which the flanges of adjacent plates continuously contact each other in the vertical direction to support the plates. And forming multiple continuous folds of
A plate-type heat exchanger characterized in that the ridges are provided with irregularities on a plane so that the width of the ridges alternately decreases and expands so that the spaces between adjacent ridges meander in the vertical direction .

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