JPH04302996A - Plate type heat exchanger - Google Patents

Abstract

PURPOSE:To prevent eluation of metal, etc., to a fluid passage and to eliminate a decrease in purity of pure water by integrally forming a plurality of heat transfer plates of synthetic resin, and setting a thickness of a gasket mount to equivalent to or more than that of a corrugated part of a heat transfer surface. CONSTITUTION:A plurality of heat transfer plates 13, 13' having openings 12 at four corners of heat transfer surfaces 11 are integrally formed of synthetic resin. In this case, the resin is mixed with glass fiber, carbon fiber, etc., to improve its strength. In order to improve a heat exchanging efficiency, the plates 13, 13' are formed with corrugated parts 14. Further, a thickness H of gasket mounts 17 at the peripheral edges of the plates 13, 13' mounted with gaskets 15, 16 and opening edges of the openings 12 is set equivalent to or more than that (h) of the parts 14. In order to prevent movements of the gaskets 15, 16 and to facilitate mounting thereof, gasket mounting grooves 18 in which the gaskets 15, 16 are detachably engaged, are formed.

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, and more particularly to a plate heat exchanger which is provided with measures to prevent metals and the like from leaching into the fluid flowing inside.

0002

[Prior Art] Generally, a plate heat exchanger has a plurality of heat transfer plates (3) (3') having openings (2) at the four corners of a heat transfer surface (1), as shown in FIG. Gasket (4
) and (5) are alternately stacked to form heat giving paths and heat receiving paths, thereby exchanging heat between the working fluids.

By the way, the heat transfer plates (3) (3') of the conventional plate heat exchanger are made of a corrosion-resistant metal material such as stainless steel, and as shown in FIGS. 4 and 5, The periphery of the heat transfer plate (3) (3') to which the gasket (4) (5) is attached and the gasket attachment part (6) on the opening edge of the opening (2) are provided to prevent the gasket from moving and to prevent the gasket from being attached. In order to facilitate the installation, a gasket mounting groove (7) is formed, and a heat transfer surface (1) is formed.
) has a corrugated portion (8) to improve the efficiency of heat exchange.
is formed.

0004

[Problems to be Solved by the Invention] Since the heat transfer plates (3) (3') of conventional plate heat exchangers are made of corrosion-resistant metal materials such as stainless steel, Fluids common in heat paths or heat receiving paths, e.g.
When running fresh water, it has sufficient corrosion resistance and liquid tightness. However, even in this case, a trace amount of metal from the heat transfer plate is eluted into the fresh water. therefore,
For example, when extremely pure water is poured into the heat supply path or heat receiving path of a conventional plate heat exchanger using the heat transfer plates (3) (3'), a trace amount of the above-mentioned corrosion-resistant metal is released. There was a problem in that it was eluted into pure water, reducing the purity of the water.

The present invention has been proposed in view of the above-mentioned problems, and it is possible to reliably prevent the purity of pure water from decreasing even if extremely pure water is passed through a heating path or a heat receiving path. The purpose is to provide a plate heat exchanger that can

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention has a plurality of heat transfer plates each having a gasket mounting groove formed in the gasket mounting portion, through a gasket fitted in the gasket mounting groove. In a plate heat exchanger in which heat transfer paths and heat receiving paths are arranged alternately by stacking, and corrugated portions are formed on the heat transfer surface of the heat transfer plate,
The above heat transfer plate is integrally molded with synthetic resin, and
The gasket mounting portion in which the gasket mounting groove is formed is formed to have a thickness equal to or greater than the thickness of the corrugated portion of the heat transfer surface.

[0007]

[Function] The heat transfer plate is integrally molded with synthetic resin, and the gasket mounting part has a gasket mounting groove formed.
Since the thickness is the same as or greater than the thickness of the corrugated portion of the heat transfer surface, even if extremely pure water is poured into the heat giving or receiving path of the heat exchanger, the purity will be maintained. In addition, the strength of the gasket mounting portion is prevented from decreasing, and high liquid tightness can be ensured.

[0008]

Embodiments An embodiment of the plate heat exchanger according to the present invention will be described below with reference to FIGS. 1 and 2.

The plate heat exchanger according to the first embodiment shown in FIGS. 1A and 1B is characterized by a heat transfer plate (13) having openings (12) at the four corners of the heat transfer surface (11). (13'
) are integrally molded from synthetic resin. This synthetic resin may be one in which glass fiber, carbon fiber, or the like is mixed to improve the strength.

[0010] The heat transfer plate (13) (13') is
A corrugated portion (14) is formed on the heat transfer surface (11) in order to improve the efficiency of heat exchange. In addition, a gasket (1
5) Heat transfer plate (13) (1) to which (16) is attached
3') and the opening edge of the opening (12), the thickness (H) of the gasket attachment part (17) is the same as or greater than the thickness dimension (h) of the corrugated part (14). Then, a gasket mounting groove (18) into which the gasket (15) (16) is removably fitted is formed in the gasket mounting portion (17) in order to prevent the gasket from moving and to facilitate the installation of the gasket. do.

[0011] Then, the heat transfer plate (13) (1
3') into the gasket mounting groove (18).
) (16) is removably fitted, a plurality of heat transfer plates (13) (13') are stacked via the gaskets, and tightened in the plate stacking direction, so that the heat giving path and the heat receiving path are alternately connected. to perform heat exchange between the working fluid.

[0012] Since the heat transfer plates (13) (13') are integrally molded from synthetic resin, impurities such as metals will not be leached into the fluid even if the fluid is passed through the heat giving path or heat receiving path of the heat exchanger. There's nothing to do. Therefore, even if extremely high purity water is passed through the heat supply path or the heat reception path, the purity of the pure water will not decrease.

[0013] Also, a laminated heat transfer plate (13) (
13') in the plate stacking direction, the gaskets (15) and (16) are compressed, and the opposing surfaces (19) and (20) of the gasket mounting portions (17) of the adjacent heat transfer plates (13 and 13') are ) come into contact. At this time, the gasket mounting part (17) has the thickness dimension (h) of the corrugated part (14).
Because it is formed to the same or greater thickness,
Has sufficient strength and gaskets (15) (16)
The gasket mounting groove (18) is prevented from deforming due to the repulsive force of the gasket or the internal pressure of the heat exchanger, and high liquid tightness can be obtained.

FIG. 2 shows a second embodiment. Components that are the same as those shown in FIGS. 1(A) and 1(B) are designated by the same reference numerals, and description thereof will be omitted. In this embodiment, a gasket mounting groove (21) and a gasket fitting groove (22) are formed in symmetrical parts on both sides of the gasket mounting portion (17) of the heat transfer plate (13) (13'). . Then, the gasket mounting groove (21) of the heat transfer plate (13) (13')
) into the gaskets (15) and (16), and insert the protruding portions of the gaskets (15 and 16) into the gasket fitting grooves (2) of the adjacent heat transfer plates (13 and 13').
2) is fitted and compressed, and the laminated heat transfer plate (1
3) Ensure liquid tightness when tightening (13').

[0015]

According to the present invention, since the heat transfer plate is integrally molded from synthetic resin, metals and the like will not be eluted into the fluid even if fluid is flowed through the heat giving path or the heat receiving path. Therefore, even if extremely high purity water is passed through the heat giving path or the heat receiving path, the purity of the pure water will not decrease.

[0016] Furthermore, since the gasket mounting portion of the heat transfer plate is formed to have the same thickness as or greater than the thickness of the corrugated portion, the gasket mounting portion has sufficient strength and ensures high liquid tightness. can do.

[Brief explanation of drawings]

FIG. 1(A) is a schematic plan view showing a first embodiment of a heat transfer plate constituting a plate heat exchanger according to the present invention, and FIG. 1(B) is an A of FIG. 1(A). -A cross-sectional view.

FIG. 2 is a sectional view of a main part of a second embodiment of a heat transfer plate.

FIG. 3 is a partially exploded perspective view of a general plate heat exchanger.

FIG. 4 is a schematic plan view of a heat transfer plate constituting a conventional plate heat exchanger.

FIG. 5 is a sectional view taken along line BB in FIG. 4;

[Explanation of symbols] 11 Heat transfer surface 13, 13' Heat transfer plate 14 Waveform section 15, 16 Gasket 17 Gasket mounting part 18, 21 Gasket mounting groove

Claims (1)

[Claims] [Claim 1] A plurality of heat transfer plates each having a gasket mounting groove formed in the gasket mounting portion are stacked with gaskets fitted in the gasket mounting grooves interposed therebetween, and heat supply paths and heat reception paths are alternately provided. In a plate heat exchanger in which a corrugated portion is formed on the heat transfer surface of the heat transfer plate, the heat transfer plate is integrally molded with synthetic resin, and a gasket mounting portion in which a gasket mounting groove is formed,
A plate heat exchanger characterized in that the thickness is the same as or greater than the thickness of the corrugated portion of the heat transfer surface.