JPH0113267Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to an improvement of a plate heat exchanger.

BACKGROUND ART In this type of plate heat exchanger, the heat transfer plate generally has an opening 1, as shown in FIG.
A plate A is inserted with a gasket 5a, surrounding the openings 3 and 4 so as to communicate with each other, and closing the other openings 1 and 2. There are two types of plates B, each of which has a gasket 5a inserted therein, and a plurality of plates A and B are alternately superimposed so that heat exchange fluids of different types are transferred to one plate A or B in the gap between the plates. A plate heat exchanger is constructed by forming a fluid flow path or a heat exchange chamber that circulates through the plate. In a heat exchanger with such a configuration, in plate A, fluid flows in from opening 1, passes through the heat transfer surface, flows from opening 2 to opening 2 of plate B, and further flows to the back side of plate B. It merges with the fluid traveling through the heat transfer surface of another plate A, which polymerizes into
It is discharged. In plate B, another fluid enters through the openings 3 and exits through the openings 4 through the heat transfer surface. Then, on the heat transfer surface of the plates A and B, which are alternately laminated and laminated,
Heat exchange between the two fluids takes place. By the way, in the plates A and B, the plate heat transfer surfaces are formed by press molding, for example, in the form of corrugations 6 consisting of alternating arrays of weir portions 7 and groove portions 8 each having a trapezoidal cross section. This waveform 6 improves the heat exchange efficiency, and when plates A and B are superposed, the dam part 7 of plate A
This has the effect that the grooves 8 of plate B and the grooves 8 of plate B intersect and abut, and at the same time, the grooves 8 of plate A and the dam 7 of plate B cross and abut each other, supporting the adjacent plates. There is.

Problems to be Solved by the Invention In the plate heat exchanger described above, the fluid flowing in from the opening 1 of the plate A has a groove 8 on the heat transfer surface of the adjacent plate B with respect to the flow direction of the fluid. Since they intersect and create resistance, they tend to flow mainly along the grooves 8 of the plate A toward the openings 2. Therefore, in the plate heat exchanger described above, attempts are made to reduce pressure loss. For example, it is necessary to widen the width of the groove portion 8 to enlarge the flow path, but on the other hand, there is a drawback that the bending strength of the groove bottom in the direction perpendicular to the waveform 6 is reduced.

The purpose of this invention is to provide a plate heat exchanger that can reduce pressure loss without reducing strength, in view of the above-mentioned problems in this type of plate heat exchanger.

Means to Solve the Problem This invention has openings at the four corners of the heat transfer surface, and allows the two fluids to be heat exchanged to flow from the inflow opening at one corner diagonally to the outflow opening at the other corner on both sides of the heat transfer surface. Weir parts parallel to each other and groove parts wider than the weir parts are formed on the heat transfer surface in an alternating arrangement along the flow direction of each fluid to achieve wave-like transmission. Two types of heat transfer plates that serve as hot surfaces are combined with their wavy heat transfer surfaces in contact with each other, and multiple sets of these are stacked, and two fluids for heat exchange are formed between each layer. In a plate type heat exchanger in which heat is exchanged via the heat transfer plates by alternately flowing through the channels, the bottom surface of each groove formed on the heat transfer surface of each heat transfer plate has a surrounding area. Reinforcing convex portions that are raised and depressed inside are formed at appropriate intervals and low along each groove portion.

Effect The heat exchange fluid flows through the wide groove, reducing pressure loss. Furthermore, the reinforcing convex portions prevent a decrease in bending strength in the direction perpendicular to the waveforms due to the wide groove portions of the heat transfer plate. Of course, since the reinforcing convex portion is formed low, it does not increase the flow path resistance.

Embodiments The configuration of this invention will be described below with reference to the drawings.

FIGS. 3 and 4 show an embodiment of the plate heat transfer surface of the plate heat exchanger according to this invention, in which alternating weir parts 11 and groove parts 12 of, for example, trapezoidal cross sections are formed by press molding. The waveform 13 is composed of an array. The waveform 13 is the weir part 1
The groove portion 12 is formed wider than the groove portion 1, and a large number of annular convex portions 14 are provided protruding from the bottom surface of the wide groove portion 12. As shown in FIG. 4, the height of the convex portion 14 is set to be low enough not to increase the flow path resistance of the groove portion 12.

In this invention, as described above, a large number of annular protrusions 14 are protruded from the bottom surface of the groove 12 of the waveform 13, so that the annular protrusions 14 improve the resistance to bending of the bottom surface of the groove 12. It is possible to increase the bending strength in the direction perpendicular to the

FIG. 5 shows another embodiment of the convex portion 14, in which the convex portion 14 is provided in an elliptical ring shape.

Note that the shape of the convex portion 14 is not limited to the annular shape shown in the drawings, but may be formed in a circular or pseudo-circular shape.

Effects of the invention As explained above, this invention has the following effects. That is, when the weir part and the groove part are provided in parallel on the heat transfer surface,
Moreover, when the pressure loss of the heat exchange fluid is reduced by widening the groove width, the bending strength in the direction perpendicular to the wave curve in the widened groove portion decreases.

In view of the above points, the present invention has a structure in which the bottom of each groove is
By forming reinforcing convex parts at appropriate intervals,
It has improved bending strength.

Providing reinforcing convex portions at the bottoms of grooves whose width has been increased to reduce the pressure loss of the heat exchange fluid increases the pressure loss of the heat exchange fluid.

Therefore, the present invention suppresses pressure loss to a low level by forming the reinforcing convex portion with a raised periphery, a depressed interior, and a low height.

The reinforcing convex part has a raised periphery and a depressed inside, resulting in an annular raised part with an inverted U-shaped or inverted V-shaped cross section, and exhibits sufficient reinforcing rib action even if the height is low. be able to.

In this way, the reinforcing convex part is formed low enough not to increase the flow path resistance, in line with the fact that the width of the groove part is widened and the pressure loss of the heat exchange fluid is reduced. To improve the bending strength of the plate by making the width of the groove wider to reduce the pressure loss of the heat exchange fluid without significantly affecting the flow of the heat exchange fluid, and by having a structure for the integrated load. I can do it.

[Brief explanation of drawings]

Figure 1 is a schematic plan view showing the plates in this type of plate heat exchanger, and Figure 2 is a schematic plan view showing the adjacent two plates.
Oblique view showing cross abutments between seed plates, 3rd
The figure is a plan view of the main part of the plate heat transfer surface of the plate heat exchanger according to this invention, FIG. 4 is a sectional view taken along the line of FIG. 3, and FIG. FIG. 11... Weir part, 12... Groove part, 13... Waveform,
14...Protrusion.

Claims (1)

[Claim for Utility Model Registration] The heat transfer surface has openings at the four corners, and on both sides of the heat transfer surface for the two fluids to be heat exchanged, the inflow opening at one corner diagonally with respect to the outflow opening at the other corner intersects. 2. A wave-shaped heat transfer surface is formed by forming weir portions parallel to each other and groove portions wider than the weir portion in an alternating arrangement along the flow direction of each fluid.
Heat transfer plates of different types are combined with their wavy heat transfer surfaces in contact with each other, and multiple sets of these are stacked, and the fluid for heat exchange is alternately passed through the channels formed between each layer. In a plate heat exchanger in which heat is exchanged through the heat transfer plates, the bottom surface of each groove formed on the heat transfer surface of each heat transfer plate has a raised periphery and a depressed interior. A plate heat exchanger characterized in that reinforcing convex portions are formed along each groove portion at appropriate intervals and at a low height.