JPH10267582A - Plate-type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an occurrence of strain during a press forming of a plate and minimize lowering of the strength of the plate. SOLUTION: On a heat transfer surface 3 of a plate 1 having a wave-formed corrugated contour, strain prevention beads 6 are formed so as to prevent an elongation and a strain in a direction which intersects the waveform. The strain prevention beads 6 are arranged such that they do not overlap with strain prevention beads 6' formed on a neighboring plate at the time of laminating plates so as to avoid a situation that contact support points between to neighboring plates 1 become largely apart from each other.

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 comprising a plurality of stacked plates, wherein the plate is formed into a corrugated uneven shape in order to reduce the size of the apparatus without lowering the pressure resistance. The present invention relates to a plate-type heat exchanger in which the heat transfer surface is prevented from being stretched and distorted in a direction intersecting the waveform.

[0002]

2. Description of the Related Art In general, a plate-type heat exchanger is formed by laminating a plurality of plates (11) as shown in FIG. 2 and alternately flowing different kinds of fluids between adjacent plates (11). Heat exchange is performed between the two fluids via the plate (11).

[0003] The plate (11) has a heat transfer surface (1) formed in four corners of a rectangular metal plate with passage holes (12) serving as entrances and exits of fluid, and formed in the center in a corrugated uneven shape.
3) and a gasket (14) surrounding the periphery of each passage hole (12) and the periphery of the heat transfer surface (13).
Is provided with a gasket groove (15) for fitting support.

The plates (11) are alternately rotated by 180 ° on a plane, that is, turned upside down, and sequentially laminated to form a plate in which different kinds of fluid alternately flow between the adjacent plates (11). Form a heat exchanger.

As described above, the heat transfer surface (13) of the plate (11) is formed in a corrugated shape so as to improve the heat transfer performance at the time of heat exchange, and to alternately turn the plate upside down. When the layers are successively stacked, the corrugations formed on the heat transfer surface (13) of the adjacent plate (11) hit each other in an intersecting state and are supported so as to achieve pressure resistance.

In the plate (11), since the heat transfer surface (13) has a corrugated uneven shape,
The gasket groove (15) located around the heat transfer surface (13) has a flat shape and expands without springback due to press molding, although it expands by springback in the direction intersecting with the waveform by press molding. Absent. Therefore, the extension of the heat transfer surface (13) of the plate (11) is restricted by the gasket groove (15), and the plate (11) is distorted by press molding. This distortion hinders the productivity of the plate (11), and furthermore, the plate (1)
Since the suspension length becomes longer when the device is suspended, the compactness of the device is impaired.

As a countermeasure against such a distortion, as shown in FIG. 3, in order to reduce the amount of springback of the heat transfer surface (13), a continuous strain in a direction intersecting the waveform of the heat transfer surface (13) is obtained. One in which a prevention beat (16) is formed (JP-A-7-260386) is known.

[0008]

However, in the above-mentioned known device, when the plates are laminated, as shown in FIG.
Since it partially overlaps with the distortion prevention beat of the adjacent plate (indicated by a dotted line in FIG. 4 and denoted by reference numeral 16 ′), the contact support point between the adjacent plates (11) is largely separated in the vicinity of the overlap, so that There is a problem that the pressure receiving area at the support point increases and the strength of the plate (11) decreases.

[0009] As shown in Fig. 5, a distortion preventing bead (16 ') having a concavo-convex shape without discontinuity (Japanese Patent Application Laid-Open No. Hei 7-260387) is also known. However, there is a problem that the working of the press mold is difficult. In addition, depending on the disposition of the distortion preventing bead (16 '), the contact support point between the adjacent plates (11) may be largely separated.
There is also a problem that the strength of the steel is reduced. However, in FIG. 5, the solid line on the heat transfer surface (13) of the plate (11) indicates the peak of the corrugated shape, and the dotted line indicates the valley of the corrugated shape.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made to improve and eliminate the problems. It is an object of the present invention to make it possible to reduce the size of an apparatus by preventing distortion of a plate and to further reduce the strength of the plate. The goal is to minimize the decline.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a heat-transfer surface having a corrugated irregular shape of a plate, and a continuous distortion preventing bead extending over a plurality of waveforms in a direction intersecting the waveform. And the continuous strain preventing beads are arranged so as not to overlap with the strain preventing beads of the adjacent plate when the plates are laminated.

According to the present invention, since a continuous strain preventing bead is formed on the heat transfer surface of the plate over a plurality of waveforms in a direction intersecting with the waveform, the continuous strain preventing bead forms a waveform formed by press forming the plate. The amount of springback of the heat transfer surface in the crossing direction can be greatly reduced. In addition, since the continuous strain preventing beats are arranged so as not to overlap with the continuous strain preventing beats of the adjacent plate at the time of stacking the plates, it is possible to avoid a state where the contact support points between the adjacent plates are largely separated at the time of stacking the plates.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows a plate (1) used in the plate heat exchanger of the present invention. This plate (1) has passage holes (2) at the four corners of a rectangular metal plate as inlets and outlets of fluid.
And a heat transfer surface (3) formed in a corrugated shape in order to achieve pressure resistance in the center, and surrounds the periphery of each passage hole (2) and the periphery of the heat transfer surface (3). Groove (5) for fitting and supporting gasket (4)
Is provided. On the heat transfer surface (3), a continuous anti-strain bead (6) is formed over a plurality of waveforms in a direction intersecting with the waveforms. The beats are arranged so as not to overlap with the distortion prevention beats (shown by dotted lines in FIG. 1 and denoted by reference numeral 6 ′, but the waveform is not shown).

In the plate heat exchanger of the present invention,
Since the continuous strain preventing bead (6) extending over a plurality of waveforms is formed on the heat transfer surface (3) of the plate (1) in a direction crossing the waveform, the plate (1) is formed by the continuous strain preventing bead (6). The springback amount of the heat transfer surface (3) in the direction intersecting with the waveform formed by the press forming can be greatly reduced. Moreover, since the continuous strain preventing beats (6) are arranged so as not to overlap with the continuous strain preventing beats (6 ') of the adjacent plate at the time of stacking the plates, the contact support between the adjacent plates (1) at the time of stacking the plates is provided. It is possible to avoid a situation where the points are far apart. This prevents distortion due to the press forming of the plate (1), makes it possible to reduce the size of the device, and suppresses a decrease in the strength of the plate (1) as much as possible.

The height (depth) of the distortion preventing bead (6)
Can be set arbitrarily within the range of the height (depth) of the corrugated shape of the heat transfer surface (3).

It is best that the crossing angle between the distortion preventing bead (6) and the waveform of the heat transfer surface (3) is orthogonal.
Any angle may be used.

[0018]

As described above, according to the present invention, a continuous distortion preventing bead extending over a plurality of waveforms in a direction intersecting with the waveform is formed on the heat transfer surface having a corrugated shape of the plate. Since the continuous strain prevention beads are arranged so that they do not overlap with the distortion prevention beads of the adjacent plates when the plates are stacked, the amount of springback of the heat transfer surface in the direction that intersects the waveform due to the press forming of the plates is large. In addition, it is possible to avoid a state in which the contact points between adjacent plates are greatly separated from each other when the plates are stacked. Therefore, it is possible to prevent distortion due to the press forming of the plate and to make the equipment compact, and it is possible to suppress a decrease in the strength of the plate as much as possible.

[Brief description of the drawings]

FIG. 1 is a plan view of a plate used in a plate heat exchanger of the present invention.

FIG. 2 is a plan view of a plate used in a conventional plate heat exchanger.

FIG. 3 is a plan view of a plate in which a conventional distortion countermeasure is taken.

FIG. 4 is a plan view of the plate of FIG. 3 showing the distortion prevention beats of adjacent plates by dotted lines.

FIG. 5 is a plan view of a plate in which another conventional distortion countermeasure is taken.

[Explanation of symbols]

 Reference Signs List 1 plate 2 passage hole 3 heat transfer surface 4 gasket 5 gasket groove 6 distortion prevention bead

Claims (1)

[Claims] 1. A plate heat exchanger comprising a plurality of plates having a heat transfer surface formed in a corrugated uneven shape, wherein the heat transfer surface of the plate extends over a plurality of waveforms in a direction intersecting the waveforms. A plate type heat exchanger wherein a continuous strain preventing bead is formed, and the continuous strain preventing bead is arranged so as not to overlap with a strain preventing bead of an adjacent plate at the time of laminating the plates.