JP2002107086A - Plate-type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the changing time of food liquid, when the heat exchanging treatment of two or more kinds of food liquids is carried out in the same device, by solving the problem of flavor spread by gaskets. SOLUTION: A prescribed number of plates 1 are laminated via gaskets 7 coated with a resin or resin gaskets. The gasket 7 coated with the resin is formed by coating a gasket body 7a made of a synthetic rubber with a resin sheet 7b. The resin gasket is made of a resin simple substance. Since the resin sheet 7b of the gasket 7 coated with a resin, for instance, a fluororesin sheet is employed. As the resin of the resin gasket, for instance, a fluororesin is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate heat exchanger for exchanging heat of food liquid.

[0002]

2. Description of the Related Art As shown in FIG. 3, for example, a plate type heat exchanger for exchanging heat of food liquid is constituted by laminating a predetermined number of plates 1, 1... This is formed by tightening and fixing this between a stand frame (S frame) 2 and an end frame (E frame) 3 via a tightening bolt (not shown). By sealing the gaskets 4, 4... Between the plates 1, 1... And between the end plates 1 and the S plate 2, as shown in FIG. Are alternately formed with the gap flow paths 6, 6... For the medium, and the food liquid flows through the gap flow paths 5, 5,. The heat exchange is performed by circulating the medium through the passages 6, 6,.

[0003]

In the plate heat exchanger, heat exchange processing of various food liquids with the same equipment has been conventionally performed. By the way, in order to heat-exchange various kinds of food liquids with the same equipment, it is necessary to wash the inside of the plate heat exchanger with CIP (stationary cleaning) or the like when switching the food liquid. In particular, when a liquid with a strong food odor is used, a gasket made of synthetic rubber 4,
4), there is a problem that the residual food odor absorbed in the food liquid is transferred to the food liquid after the switching and deteriorates the quality. Therefore, the CIP at the time of the switching needs to be performed more than enough. Therefore, a long time is required for the CIP at the time of switching, and there is a problem that the time required for switching the food liquid becomes too long.

In general, the CIP performs a cleaning operation while sequentially switching each CIP solution such as an acid, an alkali, and water at about 60 to 80 ° C. In order to shorten a cleaning time for deodorization, each CIP is used. When the operation is performed with the temperature and concentration of the liquid raised, the influence on the synthetic rubber gaskets 4, 4,... Is great, and the product life of the gaskets 4, 4,. In some cases, it has to be replaced, and there has been a problem that running costs increase.

[0005] The present invention has been proposed in view of the above-mentioned problems, and solves the problem of incense transfer to a gasket so that two or more types of food liquids can be heat-exchanged by the same equipment. It is an object of the present invention to provide a plate heat exchanger that shortens the time.

[0006]

In order to achieve the above object, the present invention provides a plate type heat exchanger for exchanging heat of a food liquid constituted by laminating a predetermined number of plates via a gasket. As the gasket, a resin-coated gasket in which a gasket body made of synthetic rubber is coated with a resin sheet, or a resin gasket made of a single resin is used. Specifically, the resin sheet of the resin-coated gasket is a fluororesin sheet, or the resin of the resin gasket is a fluororesin.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a plate heat exchanger according to the present invention will be described with reference to the embodiments shown in FIGS. The same components as those shown in FIGS. 3 to 5 are denoted by the same reference numerals, and description thereof will be omitted.

In the plate heat exchanger of the present invention, as shown in FIG. 1, gap channels 5, 5,... For food liquid are sealed with resin-coated gaskets 7, 7,.

The resin-coated gasket 7 is shown in FIGS.
As shown in FIG. 5, a gasket main body 7a having the same material and shape as the gasket 4, and a resin sheet having a U-shaped cross section integrally formed on the gasket main body 7a so as to surround the liquid contact side from three sides, for example, a fluororesin And a sheet 7b. The fluororesin sheet 7a has a characteristic that the fluororesin is a non-adhesive resin and has low liquid permeability.

In the plate heat exchanger according to the present invention, the food liquid is sealed by the resin-coated gaskets 7, 7,. Will be in contact with As a result, the food liquid can be prevented from contacting the gasket main body 7a of the resin-coated gasket 7, so that the odor of the food liquid can be prevented from being transferred to the resin-coated gasket 7. For this reason, it is not necessary to take a long time for the CIP when switching the food liquid as in the related art, or to increase the concentration or the temperature of each CIP liquid to perform the cleaning operation, so that the food liquid can be washed off with a low load and in a short time. At the same time, the smell of food liquid is low,
It can be deodorized in a short time. Therefore, when two or more types of food liquids are subjected to heat exchange processing by the same device, the switching time of the food liquids can be greatly reduced.

As described above, an embodiment of the present invention has been described, but the present invention is not limited to such an embodiment. For example, in the above-described embodiment, the resin-coated gasket 7 has the gasket main body 7a covered and integrated with the fluororesin sheet 7b.
b may be coated and integrated. Further, in the above-described embodiment, the resin-coated gasket 7 in which the resin sheet 7b is coated and integrated on the gasket main body 7a is used. However, when the operating conditions are low pressure, the resin gasket is made of a resin alone, for example, a fluororesin alone. It is possible to use
The same effect as the resin-coated gasket 7 can be obtained. Furthermore,
In the above embodiment, the gap channels 5, 5,... For the food liquid are sealed by the resin-coated gaskets 7, 7,. It may be sealed with a resin gasket.

[0012]

As described above, according to the present invention,
Using a resin-coated gasket or a resin gasket to prevent the smell of food liquid from being transferred to the gasket. The washing can be performed in a short time, and the switching time of the food liquid can be greatly reduced. In addition, since the inside of the chamber can be cleaned with a low load and in a short time, the influence on the gasket is reduced, and the product life of the gasket is extended, thereby extending the gasket replacement interval and reducing the running cost. Can be suppressed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a plate heat exchanger according to the present invention.

FIG. 2 is a perspective view of a main part of a gasket used in the plate heat exchanger according to the present invention.

FIG. 3 is an exploded perspective view showing an example of a plate heat exchanger.

FIG. 4 is a schematic longitudinal sectional view of the plate heat exchanger taken along the line AA in FIG. 3;

FIG. 5 is a cross-sectional view of a main part of the plate heat exchanger taken along the line BB in FIG. 3;

[Explanation of symbols]

 Reference Signs List 1 plate 2 S plate 3 E plate 4 gasket 5 gap flow path (for food liquid) 6 gap flow path (for medium) 7 resin-coated gasket 7a gasket main body 7b resin sheet (fluororesin sheet)

Claims (3)

[Claims] 1. A plate heat exchanger for exchanging heat of a food liquid constituted by laminating a predetermined number of plates via a gasket, wherein a gasket main body made of synthetic rubber is used as the gasket. A plate-type heat exchanger using a resin-coated gasket coated with a resin or a resin gasket made of a resin alone. 2. The plate heat exchanger according to claim 1, wherein the resin sheet of the resin-coated gasket is a fluororesin sheet, or the resin of the resin gasket is a fluororesin. 3. The plate type heat exchanger according to claim 1, wherein two or more types of food liquids are switched and heat exchanged by the same device.