JPH05264180A - Plate type heat exchanger - Google Patents

Abstract

PURPOSE:To obtain a plate type heat exchanger, reduced in manufacturing cost thereof and capable of effecting stabilized heat exchange for a long period of time. CONSTITUTION:A first passage hole gasket groove 5, surrounding a first passage hole 2, is formed on the forming surface of gasket groove 7 of a plate 1. The first passage hole gasket groove 5 is formed so as to be more shallow than the other gasket groove 7 and independent from the other gasket groove 7. A cassette l is constituted by connecting the rear sides 1a of the plates 1 to each other and, further, a plurality of sets of cassettes 11 are laminated while interposing a passage hole gasket 13, fitted into the first passage hole gasket groove 5 and provided with a given thickness, and a main gasket 12, fitted into the other gasket groove 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate type heat exchanger used when one of two types of mediums for heat exchange is a corrosive medium such as high temperature, strong acid and solvent.

[0002]

2. Description of the Related Art A general plate type exchanger has a plurality of plates (21) having passage holes (20) at four corners and a gasket (22) made of synthetic rubber or the like, as shown in FIG. The first flow path (23) through which the first medium flows and the second flow path (24) through which the second medium flows are alternately formed between the plates (21). Has been done.

By the way, in the plate heat exchanger described above, when one medium is a corrosive medium such as high temperature, strongly acidic or solvent, the gasket (22) deteriorates as the medium passes through the flow path. There is a risk. Such alteration of the gasket (22) is not preferable because it causes problems such as liquid leakage of the medium. Therefore, under the above conditions, the plate heat exchanger having a structure in which the gasket is excluded from the flow path of the corrosive medium is used. Hereinafter, a specific configuration of such a plate heat exchanger will be described with reference to FIGS. 4 and 5.

As shown in FIG. 4 (a), the plate (25)
The first passage hole (26) and the second passage hole (2
7) and 7) are formed in pairs, and the gasket groove is formed by further projecting the bottom portion to the back surface (25a) of the plate (25) by press molding or the like. The gasket groove has first and second passage hole gasket grooves (29) (30) surrounding the first and second passage holes (26) (27) in an annular shape.
And an outer peripheral gasket groove (31) which surrounds the heat transfer surface (32) of the plate (25) in a drum shape and is continuous with the tops of the passage hole gasket grooves (29) (30), and the outer peripheral gasket. Corner gasket grooves (34a) (34) formed at four corners of the groove (31) and communicating with the outer peripheral gasket groove (31).
b) and. Of these, the inner half circumference of the first passage hole gasket groove (29) and the corner gasket groove (34a) on the first passage hole (26) side (both indicated by dotted lines) are the other gasket grooves (one point). (Shown by the chain line).

Prepare two such plates (25),
Turn one plate (25) over while turning it over
a) by facing each other, and further by joining the bottom walls of the deep gasket groove (dashed line) among the gasket grooves protruding on the back surface (25a) of the plate (25) by means such as seam welding, A cassette (36) is constructed. Then, the first flow path (38) sealed by the outer peripheral gasket groove (31) and the corner gasket groove (34b) on the second passage hole (27) side is formed on the joint surface of the cassette (36) by this welding. It is formed. At this time, since the bottom walls of the shallow gasket grooves (dotted lines) of both plates (25) (25) are separated from each other with a gap, the first passage hole (26) communicates with the first flow passage (38). On the other hand, since the second passage hole gasket groove (30) and the corner gasket groove (34b) adjacent thereto are welded to the mating surface, the second passage hole (27) becomes the first passage (38).
Separated from.

[0006] The cassette (36) thus configured
As shown in FIG. 4B, a plurality of sets are laminated with the main gasket (40) and the passage hole gasket (41) interposed between the surface (25b) of the plate (25). The main gasket (40) is formed in a substantially trapezoidal shape so as to fit into a part of the outer peripheral gasket groove (31) and the corner gasket groove (34a) on the first passage hole (26) side. A thick part (40a) fitted in the outer peripheral gasket groove (31) and a thin part (40a) fitted in the corner gasket groove (34a).
b) and are integrally provided. Meanwhile, passage hole gasket (41)
Is formed in an annular shape so as to be fitted into the first passage hole gasket groove (29), and like the main gasket (40), the thick portion (41) fitted into the deep groove (solid line portion).
a) and a thin portion (41) to be fitted in the shallow groove (dotted line portion)
b) and are integrally provided. Such gaskets (40)
By interposing (41), cassettes (36) (36)
The second flow path (43) sealed by the main gasket (40) is formed on the laminated surface of the. Further, since the passage hole gasket (41) seals the first passage hole (26), the first passage hole (26) is isolated from the second passage (43).

Similarly, by stacking a plurality of sets of cassettes (36) with gaskets (40) and (41) interposed, as shown in the sectional view of FIG. 5, the first flow path (38) and the second flow path (38) are formed.
A plate-type heat exchanger having alternating flow paths (43) is configured. Here, as described above, the first flow path (38) is not sealed by the gasket but is sealed by the outer peripheral gasket groove (31) and the corner gasket groove (34b) protruding to the back surface (25a) of the plate (25). ing. This allows a corrosive medium to flow in the first flow path (38), and allows stable heat exchange between this corrosive medium and the normal medium flowed in the second flow path (43) for a long period of time. Is performed.

[0008]

By the way, as described above, since the two kinds of gaskets interposed between the cassettes are closely adhered to the deep groove and the shallow groove gasket groove, the thick wall portion and the thin wall portion are integrally formed. There is a need to. However, in order to obtain such a gasket, it is necessary to precisely form a thick wall portion and a thin wall portion in the mold for molding the gasket, which increases the manufacturing cost of the mold. In addition, since this gasket contains a large amount of thick parts, the amount of gasket material used increases. From such a point, the conventional plate heat exchanger has a problem that the manufacturing cost of the gasket becomes high. On the other hand, such gaskets having different thicknesses may cause a difference in sealing effect between the thick portion and the thin portion when stacking the cassettes, which is not preferable for stable heat exchange for a long period of time. In particular, the passage hole gasket that seals the first passage hole is used for the first passage to the second passage.
In order to surely prevent the inflow of the medium, it is necessary to exhibit a particularly stable sealing effect.

Therefore, an object of the present invention is to provide a plate type heat exchanger which is low in manufacturing cost and can perform stable heat exchange for a long period of time.

[0010]

[Means for Solving the Problems] To achieve the above object,
In the present invention, two plates, each having a first passage hole and a second passage hole formed in pairs at the four corners, and a gasket groove formed around the heat transfer surface,
The cassette wall is formed by adhering the bottom walls of the gasket groove to each other while closely adhering to each other to form a cassette, and a plurality of sets of the cassettes are laminated with a gasket fitted in the gasket groove interposed therebetween to form each cassette. Between the plates of the first passage communicating with the first passage hole is sealed by the gasket groove of both plates, and the second passage communicating between the cassette and the second passage hole is sealed by the gasket. In the plate heat exchanger configured as described above, the first passage hole gasket groove surrounding the first passage hole is shallower than the other gasket grooves and independent of the other gasket grooves on the surface of the plate where the gasket groove is formed. Formed,
The passage hole gasket was fitted in the first passage hole gasket groove.

[0011]

Since the first passage hole gasket groove surrounding the first passage hole is formed independently of the other gasket grooves, the passage hole gasket fitted in the first passage hole gasket groove has a thick wall portion and a thin wall portion. Can be formed with a constant thickness without configuring As a result, a mold for molding the passage hole gasket can be easily manufactured, and a constant sealing effect can be obtained over the entire circumference of the passage hole gasket. Further, since the first passage hole gasket groove is formed shallower than the other gasket grooves, the passage hole gasket can be formed thinner, and the amount of gasket material used when forming the passage hole gasket is reduced.

[0012]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 (a) is a perspective view showing how the plates (1) are joined. As shown in the figure, the plate (1) is formed with a pair of first passage holes (2) and second passage holes (3) at its four corners, as in the conventional product. A gasket groove is formed such that the bottom portion is projected to the back surface (1a) of the plate (1) by molding or the like. The gasket groove is a first and second passage hole gasket groove (5) surrounding the first and second passage holes (2) and (3) in an annular shape.
(6) and the top of the second passage hole gasket groove (6), and the outer peripheral gasket groove (7) surrounding the heat transfer surface (4) independently of the first passage hole gasket groove (5). )When,
It is composed of corner gasket grooves (8a) and (8b) formed at four corners of the outer peripheral gasket groove (7). Further, the first passage hole gasket groove (5) and the corner gasket groove (8a) adjacent to the first groove (5) are formed so as to be shallower than the other gasket grooves (shown by a chain line).

Two plates (1) having such a structure
The first channel (10) is formed between the plates (1) and (1) by joining (1) to each other by joining the bottom walls of the deep groove gasket groove (dashed line) by means such as seam welding. A cassette (11) is provided which is provided. At this time, the first passage hole gasket groove (5) of both plates (1) (1) and the corner gasket groove (8a) adjacent thereto are separated from each other with a gap, and the second passage hole gasket groove (6) and this Since the corner gasket groove (8b) adjacent to is welded, the first flow path (10) communicates only with the first passage hole (2).

FIG. 1 (b) is a perspective view showing a stacked state of the cassettes (11) and (11). As shown in the figure, the cassettes (11) (11) are laminated via the main gasket (12) and the passage hole gasket (13). Of these, the main gasket (12) is the thick part (12a) as in the past.
And the thin portion (12b) are integrally formed into a substantially trapezoidal shape. On the other hand, unlike the conventional product, the passage hole gasket (13) is formed with a uniform thickness over the entire circumference. By interposing such gaskets (12) and (13), the laminated surfaces of both cassettes (11) and (11) communicate with the second passage hole (3) and are isolated from the first passage hole (2). A second flow path (14) is formed.

Similarly, by stacking a plurality of cassettes (11) with gaskets (12) and (13) interposed, as shown in the sectional view of FIG.
A plate heat exchanger having alternating flow paths (14) is configured. At this time, as described above, since the first passage hole gasket groove (5) surrounding the first passage hole (2) is formed independently of the other gasket grooves, the passage hole gasket (13) is thick. It can be formed with a constant thickness without configuring the thin and thin portions. As a result, a mold for molding the passage hole gasket (13) can be easily manufactured, and a constant sealing effect can be obtained over the entire circumference of the passage hole gasket (13). Further, since the first passage hole gasket groove (5) is formed shallower than the other gasket grooves, the passage hole gasket (13) can be formed thinly, and the gasket material at the time of forming the passage hole gasket (13) can be formed. It is possible to reduce the amount used.

In the above description, the case where the cassette (11) is composed of one type of plate having the same shape has been described, but each cassette (11) is different in type, such as a corrugated shape of the heat transfer surface. It may be formed of a plate. As shown in FIG. 3, the plate (1) having the first passage hole gasket groove (5) and the plate (1 ′) having no first passage hole gasket groove (5) are joined together. Cassette (1
The same effect can be achieved by stacking a plurality of sets of cassettes (11 ′) with the various gaskets (12) and (13) interposed therebetween to form 1 ′).

[0018]

As described above, according to the present invention, the manufacturing process of the mold for molding the passage hole gasket is facilitated, and the amount of the gasket material used during molding is reduced.
A reduction in the manufacturing cost of the passage hole gasket, and further, the manufacturing cost of the entire plate heat exchanger is achieved. Moreover, since a stable sealing effect can be obtained over the entire circumference of the passage hole gasket, stable heat exchange can be performed for a long period of time.

[Brief description of drawings]

FIG. 1A is a perspective view showing a joining state of plates of a plate heat exchanger according to the present invention, and FIG. 1B is a perspective view showing a joining state of cassettes of the same.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a sectional view showing another embodiment.

FIG. 4A is a perspective view showing how plates are joined in a conventional plate heat exchanger, and FIG. 4B is a perspective view showing how cassettes are joined together.

5 is a sectional view taken along line BB in FIG. 4 (b).

FIG. 6 is a perspective view showing a structure of a general plate heat exchanger.

[Explanation of symbols]

 1 plate 2 1st passage hole 3 2nd passage hole 5 1st passage hole gasket groove 6 2nd passage hole gasket groove 7 outer peripheral gasket groove 8a / 8b outer peripheral gasket groove 10 first flow passage 11 cassette 12 main gasket 13 passage Hole gasket 14 Second flow path

Claims (1)

[Claims] 1. A pair of plates, each having a first passage hole and a second passage hole formed in pairs at four corners, and a gasket groove formed around a heat transfer surface, The cassette wall is formed by adhering the bottom walls of the gasket groove to each other while closely adhering to each other to form a cassette, and a plurality of sets of the cassettes are laminated with a gasket fitted in the gasket groove interposed therebetween to form each cassette. Between the plates of the first passage communicating with the first passage hole is sealed by the gasket groove of both plates, and the second passage communicating between the cassette and the second passage hole is sealed by the gasket. In the plate heat exchanger configured as described above, the first passage hole gasket groove surrounding the first passage hole is shallower than the other gasket grooves on the surface of the plate where the gasket groove is formed. The formed independently from the gasket groove, plate heat exchanger, characterized in that the passage holes gasket is fitted into the first passage hole gasket groove.