JPH06281378A - Plate type heat exchanger - Google Patents

Abstract

PURPOSE:To prevent adherence of scale to a fine gap by forming a ridge at a dam, forming a protrusion contact part or a recess contact part of a double seal in contact with adjacent plate of the ridge in a short block state, and intermittently forming the protrusion contact part, the recess contact part at the dam. CONSTITUTION:Plates 20a having heat transfer surfaces and planar plates 20b inverted at 180 degrees from the plates 20a are alternately laminated to form a plate type heat exchanger. A protrusion contact 27 of a ridge 26 formed at a dam 25 of the plate 20a and a contact with a recess contact 32 of a ridge 31 formed at a double seal 30 of the plate 20b are intermittently formed. Thus, since a fine gap formed at a connector of the contact 27 to the contact 32 is shortened, scale is scarcely adhered, and necessity of dispersively cleaning required for much manpower is eliminated.

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 specifically, a weir portion and 2 located between a passage hole formed in a plate of a plate heat exchanger and a heat transfer surface. The present invention relates to a plate heat exchanger that prevents scale from adhering to the heavy seal portion.

[0002]

Plates used in plate heat exchangers
As shown in FIG. 9, (1a) is generally composed of a rectangular flat plate, and has a corrugated plate-shaped heat transfer surface (2) on its surface.
Passage holes (3) are provided at the four corners.

Gaskets (5) are formed on the plate (1a) around the passage holes (3) and the heat transfer surface (2).
There is provided a gasket groove (4) for mounting the plate, and the plate shown in the figure is formed by mounting the gasket (5) in the gasket groove (4).

Further, FIG. 10 shows a plate (1b) obtained by inverting the plate (1a) by 180 ° on a plane.

When forming the plate heat exchanger, the plate (1a) of FIG. 9 and the plate (1b) of FIG. 10 are alternately laminated so that the first flow passage and the second flow passage are alternately arranged. To form a plate heat exchanger formed in.

Then, two kinds of fluids are supplied to the first and second flow paths of the plate heat exchanger to perform heat exchange between the two kinds of fluids.

[0007]

As described above, the plate (1a) used in the plate heat exchanger has the heat transfer surface (2) in the shape of a corrugated plate to improve the heat transfer performance during heat exchange. With
As shown in FIGS. 11 and 12, the passage hole of the plate (1a)
The ridges (10) and (11) are also formed on the weir (6) and the double seal part (7) located between (3) and the heat transfer surface (2) to improve the pressure resistance of this part. As a result, the pressure resistance and heat transfer performance of the plate as a whole are improved.

However, as described above, the plate (1a) 4
The ridges (10) and (11) on the weir part (6) and the double seal part (7) located in the direction
13 and FIG. 14 are formed when the plate heat exchanger is formed by stacking the plate (1a) and the plate (1b).
As shown in, the ridge (10) formed on the weir (6) of the plate (1a)
The convex contact part (12) of the plate and the concave contact part (13) of the ridge (11) formed on the double seal part (7) of the plate (1b) come into contact with each other, and both contacting parts longitudinally on both sides, Long slit-shaped micro groove (L)
Will be formed.

Incidentally, FIG. 13 shows the plates (1
11A and 11B are cut along the line AA in FIG. 11, and FIG. 14 is cut along the line BB in FIG.

The passage hole of the plate (1a) as described above
When a long slit-shaped minute gap (L) is formed in the weir (6) that connects (3) and the heat transfer surface (2), when the processing liquid is supplied to the plate heat exchanger. However, there was a problem that scales adhered to the minute gaps (L) and grew large.

Further, if the scale adheres to the weir (6) and grows large as described above, it becomes very difficult to remove the scale even if it is washed in place.
Further, when the treatment liquid is a food liquid, it becomes a factor for propagation of various bacteria, so that it is necessary to periodically disassemble and wash the plate heat exchanger, which causes a problem that a great deal of labor is required for this work.

[0012]

[Means for Solving the Problems] Of the passage holes formed at the four corners of the plate for a plate heat exchanger, two weir portions located between the two passage holes communicating with the heat transfer surface and the heat transfer surface. Or, in one of these,

A ridge is formed on the weir, and a convex contact portion of the ridge which comes into contact with an adjacent plate is formed into a short block shape, and the convex contact portion is intermittently formed on the weir.

Alternatively, a high wall portion whose molding height is substantially in contact with an adjacent plate and a low wall portion whose height is approximately half the molding height are alternately arranged in an uneven shape. Or

Alternatively, among the passage holes formed at the four corners of the plate heat exchanger plate, two double seal portions located between the two passage holes which do not communicate with the heat transfer surface and the heat transfer surface,
Or in one of these,

A ridge is formed in the double seal portion, and a concave contact portion of the double seal portion which comes into contact with an adjacent plate is formed into a short block shape, and the concave contact portion serves as the double seal portion. Forming intermittently,

Alternatively, a high wall portion having a height at which the molding height is substantially in contact with an adjacent plate and a low wall portion having a height approximately half the height of the molding are alternately located. It is what

[0018]

As described above, the convex contact portion of the weir portion of the plate type heat exchanger plate or the concave contact portion of the double seal portion is
By making it block-shaped or uneven,
A minute gap formed on the joint surface between the convex contact portion and the concave contact portion is made short to prevent large scale from adhering to the relevant portion and to easily remove scale adhering by cleaning in place. Is.

[0019]

1 and 2 show a plate (20) according to the present invention.
It shows an essential part of the first embodiment of a).

In the figure, (21) is the heat transfer surface of the plate (20a), and (22) is the heat transfer surface (21) of the passage holes formed at the four corners of the plate (20a). , (23) is a gasket groove, (24) is a gasket installed in the gasket groove (23), and (25) is a passage hole (22) communicating with the heat transfer surface (21). It is a weir located between the heat surface (21).

The ridges (26) formed on the weir (25)
Of the above, the convex contact part (27) is not a long rod shape as in the conventional case, but a short block shape, and the convex contact part (27) is intermittently connected to the weir part (25). Form.

Further, in the double seal portion (30) located between the heat transfer surface (21) and the passage hole (22) not communicating with the heat transfer surface (21) of the plate (20a), A ridge (31) having a concave contact portion (32) similar to the conventional one is formed.

A plate (20a) having the above structure and a plate obtained by inverting the plate (20a) by 180 ° in a plane.
(20b) and laminated alternately as in the conventional, to form a plate heat exchanger, the convex contact portion (27) of the ridge (26) formed in the weir portion (25) of the plate (20a) (27), and the plate The contact portion of the ridge (31) formed in the double seal portion (30) of (20b) with the concave contact portion (32) is not continuous as in the conventional case, but is intermittent,
Slit-shaped minute gap (L) formed in this contact part
Is also very short.

If the convex contact portion (27) is formed into a block shape and the contact portion between the convex contact portion (27) and the concave contact portion (32) is intermittent, the weir portion (25) is formed. When the fluid flows, turbulence is likely to occur.

Therefore, when the treatment liquid is supplied to the plate type heat exchanger having the above structure, the minute gap (L) formed in the weir (25) is short and turbulent flow is generated in this portion. Since the scale easily occurs, the scale can be prevented from adhering to and growing in the minute gap (L) of the weir (25), and the scale can be easily removed by the stationary cleaning.

Further, in this embodiment, the convex contact portion (2) of the ridge (26) is
Since the convex contact part (27) is formed in a block shape instead of eliminating all 7), there is no fear that the dam part (26) will decrease in strength.

3 and 4 show the plate (2
It shows an essential part of the second embodiment of 0a).

In the figure, (21) is the heat transfer surface of the plate (20a), and (22) is the heat transfer surface (21) of the passage holes formed at the four corners of the plate (20a). , (23) is a gasket groove, (24) is a gasket installed in the gasket groove (23), and (25) is a passage hole (22) communicating with the heat transfer surface (21). It is a weir located between the heat surface (21).

The ridges (26) formed on the weir (25)
Among them, the shape of the convex contact portion (27), the molding height is a high wall portion (27a) having a height that substantially contacts the adjacent plate,
The low wall portions (27b) each having a height approximately half the molding height are arranged in an alternating shape.

Further, in the double seal portion (30) located between the heat transfer surface (21) and the passage hole (22) not communicating with the heat transfer surface (21) of the plate (20a), A ridge (31) having a concave contact portion (32) similar to the conventional one is formed.

A plate (20a) having the above structure and a plate obtained by inverting the plate (20a) by 180 ° in a plane.
(20b) and laminated alternately as in the conventional, to form a plate heat exchanger, the convex contact portion (27) of the ridge (26) formed in the weir portion (25) of the plate (20a) (27), and the plate The contact portion of the ridge (31) formed in the double seal portion (30) of (20b) with the concave contact portion (32) is intermittent as in the first embodiment, and is formed in this contact portion. The slit-shaped minute gap (L) is also extremely short, and turbulence is likely to occur in this portion.

Therefore, when the treatment liquid is supplied to the plate heat exchanger having the above structure, the minute gap (L) formed in the weir (25) is short and turbulent flow is present in this portion. Since the scale easily occurs, the scale can be prevented from adhering to and growing in the minute gap (L) of the weir (25), and the scale can be easily removed by the stationary cleaning.

5 and 6 show the plate (2
It shows an essential part of the third embodiment of 0a).

In the figure, (21) is the heat transfer surface of the plate (20a), and (22) is the heat transfer surface (21) of the passage holes formed at the four corners of the plate (20a). Not communicating with the passage hole, (23) a gasket groove, (24) a gasket mounted in the gasket groove (23), and (30) a passage hole (22) not communicating with the heat transfer surface (21). It is a double seal part located between the hot surface (21).

Then, of the ridges (31) formed in the double seal portion (30), the concave contact portion (32) does not have a long rod shape as in the conventional case, but has a short dimension. The concave contact portion (32) is intermittently formed in the double seal portion (30).

A weir portion located between the heat transfer surface (21) and the passage hole (22) communicating with the heat transfer surface (21) of the plate (20a).
A ridge (26) having a convex contact portion (27) similar to the conventional one is formed in (25).

A plate (20a) having the above structure and a plate obtained by inverting the plate (20a) by 180 ° in a plane.
(20b) and laminated alternately as in the conventional, to form a plate heat exchanger, the convex contact portion (27) of the ridge (26) formed in the weir portion (25) of the plate (20a) (27), and the plate The contact portion of the ridge (31) formed on the double seal portion (30) of (20b) with the concave contact portion (32) is intermittent as in the first and second embodiments, and this contact portion is The slit-shaped minute gap (L) that is formed is also extremely short, and turbulent flow easily occurs in this part, so scale adheres to the minute gap (L) of the weir (25). ,
It is possible to prevent the growth, and it is possible to easily remove the adhered scale by cleaning in place.

7 and 8 show the plate (2
It shows an essential part of the fourth example (0a).

In the figure, (21) is the heat transfer surface of the plate (20a), and (22) is the heat transfer surface (21) of the passage holes formed at the four corners of the plate (20a). Not communicating with the passage hole, (23) a gasket groove, (24) a gasket mounted in the gasket groove (23), and (30) a passage hole (22) not communicating with the heat transfer surface (21). It is a double seal part located between the hot surface (21).

In the ridges (31) formed in the double seal portion (30), the shape of the concave contact portion is a high wall whose molding height is substantially in contact with the adjacent plate. Part (32a)
And a low wall part (32b) having a height approximately half of this molding height
It is a convex and concave shape in which and are alternately located.

A weir portion located between the heat transfer surface (21) and the passage hole (22) communicating with the heat transfer surface (21) of the plate (20a).
A ridge (26) having a convex contact portion (27) similar to the conventional one is formed in (23).

A plate (20a) having the above structure and a plate (20a) which is obtained by inverting the plate (20a) by 180 ° in a plane.
(20b) and laminated alternately as in the conventional, to form a plate heat exchanger, the convex contact portion (27) of the ridge (26) formed in the weir portion (25) of the plate (20a) (27), and the plate The contact portion of the ridge (31) formed in the double seal portion (30) of (20a) with the concave contact portion (32) is intermittent as in the first to third embodiments, and this contact portion The slit-shaped minute gap (L) that is formed is also extremely short, and turbulent flow easily occurs in this part, so scale adheres to the minute gap (L) of the weir (25). ,
It is possible to prevent the growth, and it is possible to easily remove the adhered scale by cleaning in place.

In the above description, the convex contact portion (27) and the concave contact portion (32) are used alone, but the convex contact portion (27) and the concave contact portion (shown in each embodiment ( 32) may be used in any combination.

[0044]

As described above, according to the present invention, the convex contact portion of the weir portion of the plate for the plate type heat exchanger or the concave contact portion of the double seal portion is formed into a block shape or an uneven shape. Thus, the minute gap formed on the joint surface between the convex contact portion and the concave contact portion is made short, and turbulent flow is easily generated in this portion.

Therefore, when the treatment liquid is supplied to the plate heat exchanger, it is possible to prevent the scale from adhering to the minute gaps formed on the joint surface between the convex contact portion and the concave contact portion, and further,
Even during stationary cleaning, turbulent flow is likely to occur in this part, so even small scales adhering to minute gaps can be reliably removed, and there is no need to perform disassembly cleaning, which required a lot of labor in the past. .

[Brief description of drawings]

FIG. 1 is a plan view showing a main part of a first embodiment of a plate according to the present invention.

FIG. 2 is a partial cross-sectional view showing a laminated state of the first embodiment of the plate according to the present invention.

FIG. 3 is a plan view showing an essential part of a second embodiment of the plate according to the present invention.

FIG. 4 is a partial cross-sectional view showing a laminated state of a second embodiment of the plate according to the present invention.

FIG. 5 is a plan view showing an essential part of a third embodiment of the plate according to the present invention.

FIG. 6 is a partial sectional view showing a laminated state of a third embodiment of the plate according to the present invention.

FIG. 7 is a plan view showing an essential part of a fourth embodiment of the plate according to the present invention.

FIG. 8 is a partial sectional view showing a laminated state of a fourth embodiment of the plate according to the present invention.

FIG. 9 is a plan view showing a conventional example of a plate.

FIG. 10 is a plan view showing a conventional example of a plate.

FIG. 11 is a plan view showing a weir portion of a conventional plate.

FIG. 12 is a plan view showing a double seal portion of a conventional plate.

FIG. 13 is a partial cross-sectional view showing a stacked state of conventional plates.

FIG. 14 is a partial cross-sectional view showing a stacked state of conventional plates.

[Explanation of symbols]

 20a plate 22 passage hole 25 weir 26 ridge 27 convex contact part 30 double seal part 31 ridge 32 concave contact part

Claims (2)

[Claims] 1. Among the passage holes formed at the four corners of the plate of the plate heat exchanger, two weir portions positioned between the two passage holes communicating with the heat transfer surface and the heat transfer surface, or In one of these, a ridge is formed on this weir, and the convex contact portion of this ridge which comes into contact with the adjacent plate is formed into a short block shape.
The convex contact portion is formed intermittently on the weir portion, or the height of the molding is a high wall portion having a height at which it substantially contacts the adjacent plate, and the height is approximately half the height of the molding. A plate-type heat exchanger characterized in that it has an uneven shape in which low walls are alternately positioned. 2. Two double seal portions located between the heat transfer surface and two flow path holes that do not communicate with the heat transfer surface among the flow path holes formed at the four corners of the plate of the plate heat exchanger, Alternatively, in one of them, a ridge is formed in the double seal portion, and a concave contact portion of the double seal portion which comes into contact with an adjacent plate is formed into a short block shape to form a concave contact. Part is intermittently formed in the double seal part, or has a high wall part whose molding height is substantially in contact with an adjacent plate and a half height of this molding height. A plate-type heat exchanger characterized in that it has an uneven shape in which low walls are alternately positioned.