JP3030251B2 - Plate heat exchanger - Google Patents

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 for exchanging heat between two kinds of gases.
More specifically, a plurality of heat exchange plates, each of which has a plurality of protrusions for maintaining a space protruding at required intervals on one surface side, and a plurality of heat exchange plates which are adjacent to each other and whose non-protruding surfaces are opposite to each other in a relationship where the adjacent plates are upside down. The first gas is arranged between the plates having the protruding surfaces facing each other, and the plates having the protruding surfaces facing each other are brought into contact with each other, and the first gas is disposed between the plates having the protruding surfaces facing each other. The present invention relates to a plate heat exchanger in which a flow path is formed and a second gas flow path is formed between plates whose non-projecting surfaces face each other.

[0002]

2. Description of the Related Art A plate-type heat exchanger of this kind is
As described above, the first gas passage is formed between the plates having the protruding surfaces facing each other, and the second gas passage is formed between the plates having the non-protruding surfaces facing each other. 2 having different temperatures in the first gas passage and the second gas passage.
The seed gas is circulated so that heat is exchanged between the two gases.

[0003]

In such a plate heat exchanger, a low-pressure gas is passed through a first gas flow path formed between the plates whose protruding surfaces are opposed to each other, so that the non-protruding surfaces are connected to each other. When a high-pressure gas flows through the second gas flow path formed between the opposed plates, the opposed projections are in contact with each other, so that both plates forming the first gas flow path There is no possibility that the high-pressure gas in the two-gas flow path deforms inward to press the low-pressure fluid inside. However, conversely, when the high-pressure gas flows through the first gas flow path and the low-pressure gas flows through the second gas flow path, the non-projecting surfaces of the two plates forming the second gas flow path are mutually opposed. Since no interval maintaining means is provided between the plates, both plates forming the first gas passage are pushed outward by the high-pressure gas flowing through the first gas passage, and the second gas passage is formed. The flowing low-pressure gas is pressed, which causes arrhythmias in the fluid flow, making the heat transfer action very unstable and reducing the efficiency of heat exchange.

According to the present invention, a high-pressure gas is caused to flow through a first gas flow path formed between plates having projecting surfaces facing each other,
The second formed between the plates whose non-projecting surfaces are opposed to each other
Provided is a plate heat exchanger in which even when a low-pressure gas flows through a gas flow path, a low-pressure gas flowing through a second gas flow path is not pressed by a high-pressure gas flowing through a first gas flow path. As an issue.

[0005]

According to the first aspect of the present invention, a plurality of heat exchange plates 1 each having a plurality of projections 2 for maintaining a space protruding at required intervals on one surface side are adjacent to each other. The plates 1 and 1 are arranged at a predetermined interval so that the protruding surfaces 1a and the non-protruding surfaces 1b face each other in a reversed relationship, and between the plates 1 and 1 where the protruding surfaces 1a face each other. Then, the opposing projections 2 are brought into contact with each other to form a first gas flow path 3 between the plates 1 and 1 whose protruding surfaces 1a oppose each other, and between the plates 1 and 1 whose non-projecting surfaces 1b oppose each other In the plate heat exchanger having the second gas flow path 4 formed between the plates 1, 1 whose protruding surfaces 1a are opposed to each other, the engagement is fixed to one protruding surface 1a. The piece 7 is fixed to the other protruding surface 1a, and
A plurality of holding fittings 9 are provided, which are composed of engaged pieces 8 to be engaged with the pieces 7 , and hold the opposed plates 1, 1 so as not to widen the gap therebetween.

According to a second aspect of the present invention, in the plate heat exchanger according to the first aspect, either one of the engaging piece 7 and the engaged piece 8 constituting each of the holding fittings 9 is: The two opposing plates 1 and 1 are fixed by welding to the protruding surface 1a side of one of the plates 1, and the other piece is engaged with the one piece and temporarily fixed to the other piece in a state where the other piece is temporarily fixed. The plate 1 is fixed to the projecting surface 1a side by plug welding from the non-projecting surface 1b side.

According to a third aspect of the present invention, in the plate heat exchanger according to the second aspect, the means for temporarily fixing the one piece to the other piece is formed by the adhesive 10 interposed between the two pieces. It is characterized by becoming.

[0008]

1 is a plan view of a plate heat exchanger according to the present invention as viewed from the front side, FIG. 2 is an enlarged plan view taken along the line V--V in FIG. 1, and FIG. 1 is an enlarged cross-sectional view taken along line WW, FIG. 4 is an enlarged side view taken along line XX in FIG. 1, and FIG. 5 is an enlarged vertical sectional view taken along line YY in FIG. It is. As can be seen from these drawings, this plate-type heat exchanger has a plurality of heat exchangers in which a plurality of arc-shaped projections 2 for maintaining the spacing are provided on one surface side in a plurality of rows and columns at required intervals. Plate 1 for adjacent plates 1
1 is required to be opposite to the projection surface 1a (the surface on which the projection 2 is formed) and the non-projection surface 1b (the surface on which the projection 2 is not formed). By arranging them at intervals, and by contacting the projections 2 facing each other between the plates 1 facing the projection surface 1a side, the plates 1 facing the projection surface 1a side are brought into contact with each other. The first gas flow path 3 is formed, and the non-projecting surface 1b is formed.
A second gas flow path 4 is formed between the plates 1 and 1 whose sides face each other.

As shown in FIGS. 1, 4 and 5, upper and lower edges of each heat exchange plate 1 are integrally provided with upper and lower edge members 5 which are inclined and project toward the projection surface 1a. The opposing edge members 5, 5 of the adjacent plates 1, 1 are abutted and joined by welding, and the right and left edges of each heat exchange plate 1, as shown in FIGS. Left and right edge members 6 that are inclined and protrude toward the non-projecting surface 1b side
Are integrally formed, and opposing edge members 6, 6 of the adjacent plates 1, 1 are abutted and joined by welding, whereby the plurality of heat exchange plates 1 are integrally assembled with each other, and the projections are formed. The first gas flow path 3 is formed between the plates 1 and 1 whose surface sides 1a face each other, and the second gas flow path 4 is formed between the plates 1 and 1 whose face sides 1b face each other.
Is formed. Although not shown, each first gas flow path 3 has a structure communicating with each other, and has a gas supply unit and a gas discharge unit.
Similarly, the gas flow path 4 has a structure communicating with each other, and has a gas supply unit and a gas discharge unit.

In this plate heat exchanger, as can be seen from FIGS. 1 to 5, between the heat exchange plates 1, 1 having the protruding surfaces 1a facing each other, the opposed plates 1, 1 are provided. A plurality of holding fittings 9 for holding the space so as not to widen are provided at a plurality of places. Each holding bracket 9 includes a hook-shaped engaging portion 7 and an engaged portion 8 that engages with the engaging portion 7. One of the plates 1, 1 is fixed to the protruding surface 1a side by fillet welding to the protruding surface 1a side of one of the plates 1, and the engaged piece 8 is engaged with the engaging piece 7 and adhered. In a state temporarily fixed by the agent 10, the other plate 1 is fixed to the projecting surface 1a side by plug welding (also called plug welding) from the non-projecting surface 1b side to the projecting surface 1a side. In this case, the engaged piece 8 is fillet-welded to the protruding surface 1a side of one of the opposing plates 1,
The engaging piece 7 may be plug-welded to the protruding surface 1a side of the other plate 1 from the non-protruding surface 1b side.

As described above, the engaging piece 7 of each holding fitting 9
(Or the piece 8 to be engaged) with one of the opposite plates 1
Of the other plate 1 by plug welding from the non-projection surface 1b side to the projection surface 1a side of the other plate 1. Although the engaging piece 7 (or the engaged piece 8) can be fillet-welded to the protruding surface 1a side of one of the plates 1, it is attached to the engaged piece 8 (or the engaging piece 7). This is because in the engaged state, the engaged piece 8 (or the engaging piece 7) cannot be fillet welded to the protruding surface 1a side of the other plate 1. That is, since the heat exchange plates 1 are sequentially assembled by welding via the edge members 5 and 6 in the manufacture of the plate heat exchanger, one plate is provided between the plates 1 and 1 whose protruding surfaces 1a are opposed to each other. Even if the engaging piece 7 (or the engaged piece 8) can be fillet welded to the plate 1,
The engaging piece 7 (or the engaged piece 8) is
(Or the engaging piece 7), the two plates 1, 1
Is fixed, so that the engaged piece 8 (or the engaging piece 7) cannot be welded from the inside of the plates 1 and 1.

FIG. 6 shows a method of attaching each holding member 9, and as can be seen from this drawing, of the plates 1, 1 whose protruding surfaces 1a face each other, the plate 1 (plate In manufacturing the heat exchanger, the mounting portion 7a of the engaging piece 7 is fixed to a predetermined position on the protruding surface 1a side of the plate 1) to be assembled earlier by fillet welding. The engaged piece 8 is engaged with the engaging piece 7, and an adhesive 10 made of, for example, a thermoplastic resin is interposed between the engaging surfaces of the two pieces 7, 8. The piece 7 is temporarily fixed to the engaged piece 8 to obtain a state as shown by a solid line in FIG. On the other hand, the upper plate 1 (the plate 1 to be assembled later) of the two plates 1 and 1 is previously provided with a circular shape at a position where the engaged piece 8 is welded as shown in FIG. The plate 1 on the upper side of the drawing is brought closer to the plate 1 on the lower side of the drawing, and is brought into contact with the temporarily fixed engaged piece 8. Non-projecting surface 1 of plate 1 on the upper side of the drawing
Plug welding is performed from the b side through the welding hole 11,
The engaged piece 8 is fixed to the protruding surface 1a side of the plate 1 to obtain a state as shown in FIG. 6 and 7, the fillet weld of the engaging piece 7 is indicated by CW, and the plug weld of the engaged piece 8 is indicated by PW. Note that spot welding or the like may be performed instead of the fillet welding.

As means for temporarily fixing the engaged piece 8 to the engaging piece 7, brazing welding may be employed in addition to the adhesive 10, but the adhesive 10 requires less work. Easy and easy. The engaging piece 7 and the engaged piece 8 of each holding fitting 9
May be fixed to the protruding surface 1a side of both plates 1 and 1 by fillet welding and plug welding instead of being fixed by brazing, but in the case of brazing, each piece 7, 8 and the plate are fixed. There is a problem that it is difficult to uniformly interpose a wax between the plate 1 and the respective pieces 7 and 8 and cannot be stably fixed to the protruding surface 1a side of the plate 1. In this regard,
As described above, if the engaging piece 7 and the engaged piece 8 of each holding fitting 9 are fixed to both plates 1 and 1 by fillet welding and plug welding, the engaging piece 7 The engaged portion piece 8 can be easily and securely fixed to the respective protruding surfaces 1a of the opposing plates 1 and 1 in a stable state.

According to the plate heat exchanger having the above-described configuration, a plurality of plates for holding the two plates 1 and 1 facing each other such that the distance between the two plates 1 and 1 does not increase is increased. , A high-pressure gas is allowed to flow through the first gas flow path 3 formed between the two plates 1 and 1 so that the non-projecting surface 1b side faces between the two plates 1 and 1. Even if a low-pressure gas flows through the second gas flow path 4 formed in the first gas flow path, both plates 1 and 1 forming the second gas flow path 4 are inwardly moved by the high-pressure gas flowing through the first gas flow path 3. It is not deformed by being pushed, so that the low-pressure gas flowing through the second gas flow path 4 is not pressed by the high-pressure gas. Accordingly, unlike the conventional plate heat exchanger, there is no possibility that arrhythmia occurs in the flow of the fluid, and the heat transfer operation is stabilized, and efficient heat exchange can be performed. In this plate heat exchanger, when a low-pressure gas flows through the first gas flow path 3 and a high-pressure gas flows through the second gas flow path 4, both plates forming the second gas flow path 4 are used. Both plates 1 and 1 forming the first gas passage 3 are pressed even if the plates 1 and 1 are pushed outward.
The projections 2, 2 protruding from the inner surfaces of the plates 1, 1 are in contact with each other, so that they are not deformed inward.
It is not pressed by the high-pressure gas flowing through the gas flow path 4.

[0015]

According to the first aspect of the present invention, a plurality of holding fittings for holding the two plates facing each other so that the distance between the two plates does not increase is provided between the two plates facing each other. When heat exchange is performed by flowing a high-pressure gas through the first gas flow path formed between the plates and flowing a low-pressure gas through the second gas flow path formed between the two plates whose non-projecting surfaces are opposed to each other. However, the two plates forming the second gas flow path are not deformed by being pressed inward by the high pressure gas flowing through the first gas flow path. Therefore, the low pressure gas flowing through the second gas flow path is not deformed by the high pressure gas. There is no pressing. For this reason, arrhythmia does not occur in the flow of the fluid, the heat transfer action is stabilized, and efficient heat exchange can be performed.

According to the second aspect, either one of the engaging portion and the engaged portion constituting each holding bracket is directly attached to the projecting surface side of one of the opposing plates. In the state where the other piece is engaged with the one piece and is temporarily fixed, the other piece is fixed to the projecting surface side of the other plate by plug welding from the non-projecting surface side. Therefore, the engaging piece and the engaged piece can be easily and securely fixed to the protruding surfaces of the opposing plates in a stable state.

According to the third aspect, by employing an adhesive as a means for temporarily fixing the one piece to the other piece, the temporary fixing operation can be performed easily and easily.

[Brief description of the drawings]

FIG. 1 is a front view of a plate heat exchanger according to the present invention.

FIG. 2 is an enlarged plan view taken along line VV of FIG.

FIG. 3 is an enlarged cross-sectional view taken along line WW of FIG.

FIG. 4 is an enlarged side view taken along the line XX of FIG. 1;

FIG. 5 is an enlarged vertical sectional view taken along line YY of FIG. 1;

FIG. 6 is a perspective view showing a method of attaching the holding fitting.

FIG. 7 is a cross-sectional view showing a mounting state of the holding bracket mounted by the method of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchange plate 1a Projection surface 1b Non-projection surface 2 Projection 3 First gas flow path 4 Second gas flow path 5 Edge member of plate 6 Edge member of plate 7 Engagement piece 8 Engagement piece 9 Holding bracket 10 Adhesive 11 Hole for plug welding CW Fillet weld PW Plug weld

Claims (3)

(57) [Claims] 1. A plurality of heat exchange plates, each having a plurality of projections for maintaining a gap protruding at required intervals on one surface side, and a plurality of heat exchange plates, each having an adjacent plate turned upside down. The non-projection surfaces are arranged at a predetermined interval so as to oppose each other, and between the plates whose projection surfaces oppose each other, the opposing projections are brought into contact with each other, so that the first protrusions between the plates whose projection surfaces oppose each other. In a plate heat exchanger in which a gas flow path is formed and a second gas flow path is formed between plates whose non-projection surfaces are opposed to each other, one projection is provided between the plates whose projection surfaces are opposed to each other. An engaging part fixed to the surface and an engaged part fixed to the other protruding surface and engaged with the engaging part are held so that the interval between the opposing plates does not increase. Characterized by having a plurality of holding brackets for Plate heat exchanger. 2. One of the engaging part and the engaged part constituting each of the holding fittings is fixed by being welded to the protruding surface of one of the opposing plates. The other piece is fixed to the projecting surface side of the other plate by plug welding from the non-projecting surface side in a state of being engaged with the one piece and temporarily fixed. The plate heat exchanger according to claim 1, wherein 3. The plate heat exchanger according to claim 2, wherein the means for temporarily fixing the one piece to the other piece is made of an adhesive interposed between the two pieces. .