JPH0539325Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a plate heat exchanger that is made up of a large number of laminated heat transfer plates used for heat exchange of fluids in the food, pharmaceutical, and chemical industries, etc. It is.

[Conventional technology]

Normally, a plate heat exchanger has flow holes 3, 3, which serve as liquid inlets and outlets, at the four corners of a heat transfer surface 2, which has an appropriate uneven pattern on the surface, as shown in FIG.
... and surrounds the heat transfer surface 2 including a pair of vertically opposing holes, for example, holes 3, 3 at the upper right end and lower right corner in the drawing.
At the same time, a pair of holes facing each other vertically, for example, holes 3, 3 in the upper left corner and lower left corner in the drawing are installed.
This heat transfer plate 1 is shown in FIG. 4 and FIG. As shown, each heat transfer plate 1,
1... A large number of fluid passages are formed between the two fluid passages, and different fluids are alternately passed through the fluid passages so that heat exchange is performed between the two fluids via the heat transfer plate 1.

[The problem that the idea aims to solve]

Incidentally, in such a plate heat exchanger, it is necessary to drain the heat exchange fluid in order to recover expensive liquid and prevent liquid mixing due to residual liquid. However, since the circulation holes 3, 3... opened at the four corners of the heat transfer plate 1 are surrounded by gaskets 4, 5, 5 at regular intervals, even if the heat exchange fluid is drained, Liquid remains in the lower part of the gaskets 4, 5, 5 between adjacent heat transfer plates 1, 1. As a result, it is not possible to recover a large amount of expensive liquid, resulting in high lining costs, and the remaining liquid from the previous heat exchange mixes with the liquid during the next heat exchange, causing problems. In addition, even if liquid is supplied at the start of operation, air remains in the upper part of the gaskets 4, 5, 5 between the adjacent heat transfer plates 1, 1, and an air pocket is formed.
(cleaning in place), the adjacent heat transfer plate 1,
It is not possible to clean the inner top of the gasket 5 for the first pass, leaving dirt behind, resulting in a disadvantage that poor cleaning tends to occur.

Therefore, in view of the above-mentioned problems of the conventional plate heat exchanger, the purpose of this invention is to provide a plate heat exchanger that can more completely remove the liquid and air from the heat exchange fluid with a simple configuration. It is.

[Means to solve the problem]

In order to achieve the above-mentioned purpose, this idea consists of stacking a number of heat transfer plates with flow holes, which serve as inlets and outlets for fluid, at the four corners of the heat transfer surface that has been given an appropriate uneven pattern, with gaskets interposed between them. In a plate heat exchanger that allows different fluids to flow between the plates, a technical measure has been taken in which cutouts are provided above and below each of the flow holes in the heat transfer plates, the tips of which are as close as possible to the inner periphery of the gasket. There is.

[Effect]

As with the above technical means, if cutouts are provided above and below each circulation hole of the heat transfer plate, the tips of which are as close to the inner circumference of the gasket as possible, the bottom and top parts of the gasket between adjacent heat transfer plates can be cut out. The liquid and air accumulated in the heat exchanger fluid can flow out through the notches, thereby allowing the heat exchange fluid to be drained more completely and the air to be vented more completely, thereby solving the above problem.

〔Example〕

An embodiment of this invention shown in FIGS. 1 and 2 will be described below.

FIG. 1 is a schematic plan view of a heat transfer plate 6 used in the plate heat exchanger according to this invention.
This heat transfer plate 6 has a heat transfer surface 7 with an appropriate uneven pattern, and has flow holes 8, which serve as inlets and outlets for fluid, at the four corners of the heat transfer surface 7.
8..., and surrounds the heat transfer surface 7 including a pair of vertically opposing holes, for example, holes 8 and 8 in the upper right corner and lower right corner in the drawing.
At the same time, a pair of holes facing each other vertically, for example, holes 8, 8 in the upper left corner and lower left corner in the drawing are installed.
Pass gaskets 10, 10 integrally formed with the fluid passage gasket 9 surrounding the fluid passage gasket 9 are attached. As shown in FIG. 2, cutouts 8a, 8a, . . . , 8b, 8b are formed above and below each of the circulation holes 8, 8, . ...is established.

Therefore, the heat transfer plate 6 having such a configuration,
The plate heat exchanger according to the invention is constructed by stacking a large number of heat transfer plates that are alternately turned upside down and forming a large number of fluid passages through which different heat exchange fluids alternately flow between the heat transfer plates.

Such a plate heat exchanger has a heat transfer plate 6
Notches 8a, 8a at the top and bottom of each communication hole 8, 8...
..., 8b, 8b..., when the heat exchange fluid is drained, the adjacent heat transfer plates 6,
The liquid that accumulates in the lower part of the gaskets 9, 10, 10 of No. 6 is removed by the notches 8a provided at the lower part of the communication holes 8, 8...
8a..., and when the liquid is supplied at the start of operation, the air accumulated in the upper part of the gaskets 9, 10, 10 between the adjacent heat transfer plates 6, 6 can be drained from the flow holes 8, 8... It can flow out through the notches 8b, 8b, .

In the above embodiment, the heat transfer surface 7 is surrounded by a fluid passage gasket 9, including a pair of vertically opposing holes, for example, the holes 8, 8 in the upper right corner and the lower right corner in the drawing. A trapezoidal type heat transfer plate 6 is described in which a pair of holes 8, 8 in the upper left corner and a lower left corner are surrounded by separate path gaskets 10, 10 in the drawing. The idea is to surround the heat transfer surface, including a pair of diagonally located holes, with a fluid passage gasket, and to surround the other diagonally located pair of holes with separate path gaskets. A flow type heat transfer plate is also applicable.

[Effect of idea]

As explained above, this device provides notches at the top and bottom of each circulation hole of the heat transfer plate, the tips of which are as close to the inner circumference of the gasket as possible, thereby making it possible to more completely remove the liquid and air from the heat exchange fluid. As a result, the ability to recover expensive liquids can be improved, liquid mixing due to residual liquid can be reliably prevented, and cleaning performance can be greatly improved by eliminating cleaning residues.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of a heat transfer plate used in a plate heat exchanger according to this invention, and FIG. 2 is an enlarged plan view of the main parts thereof. Fig. 3 is a schematic plan view of a heat transfer plate used in a conventional plate heat exchanger, Fig. 4 is an exploded perspective view illustrating the arrangement of heat transfer plates in a plate heat exchanger, and Fig. 5 is a heat transfer plate. It is a longitudinal cross-sectional view when the plates are combined. 6... Heat transfer plate, 7... Heat transfer surface, 8... Communication hole, 8b, 8b... Notch, 9... Gasket for fluid passage, 10... Gasket for path.

Claims (1)

[Scope of Claim for Utility Model Registration] A heat transfer plate that has flow holes that serve as inlets and outlets for fluid at the four corners of a heat transfer surface that has an appropriate uneven pattern,
In a plate heat exchanger in which a large number of heat transfer plates are laminated via gaskets and different liquids flow between the heat transfer plates, there are cutouts whose tips are as close as possible to the inner periphery of the gasket above and below each circulation hole of the heat transfer plates. A plate heat exchanger characterized by having a notch.