JPS61180892A - Plate type heat exchanger - Google Patents

Abstract

PURPOSE:To improve the heat transfer rate and the pressure resistance of the titled plate type heat exchanger by alternately turning back a plurality of plates in which projection portions and recess projections are disposed alternately in a grid shape as portions and recess portions have contact points and are continued smoothly at the contact points, allowing the positions of neighboring projections portions of respective plates to be coincident to each other and made contact with each other, and causing a fluid to flow between respective plates along clearances formed between respective plates. CONSTITUTION:Separate fluids flow along flowpaths alternately formed between respective plates 6. Upon this occasion, since projection portions 14 and recess portions 13 of plates 6 are projected in flowpaths 15 and 16, flows of respective fluids repeat expansion and contraction, and the turbulent effect is amplified. By this turbulent effect, the heat transfer rate becomes high and the heat transfer wall surface becomes difficult to be stained. Further, since respective plates make multi-point contact at respective contact portions of recess portions 13 and projection portions 14 and the plates 6 are constituted to smoothly continue, it is possible to cause the thermal stress to escape as the distortion of the plates 6. Hence, the heat exchange becomes strong in the thermal impact and the pressure resistance is improved.

Description

[Detailed description of the invention] Industrial applications The present invention relates to heat exchangers, particularly plate heat exchangers.

BACKGROUND ART A heat exchanger that uses a plate as a two-fluid partition and performs heat exchange using the partition as a heat transfer wall surface is generally called a plate heat exchanger.

7 to 9 show conventional examples of such a plate heat exchanger.

That is, the conventional plate-to-plate heat exchanger is constructed by stacking a plurality of plates 1 as shown in FIG. A gasket 2 is interposed around these plates 1. Furthermore, plate 1 has tie bolts (not shown).
It is tightened by. This allows each plate 1
This is to seal the fluid flowing between them. At this time, a plate pressed into the shape shown in FIG. 8, for example, is used as the plate 1.

As another example of a conventional plate heat exchanger, as shown in FIG. 9, plates 3 pressed into a corrugated shape are stacked and two opposing sides of the plates 3 are alternately welded to form a flow path. There are also some formats.

Problems to be Solved by the Invention In these conventional plate heat exchangers, as a method for preventing plate deformation due to internal pressure,
Since the convex parts 4 of the plate 1 shown in the figure form a certain angle and contact each other at multiple points, in the latter case, the concave part 5 shown in FIG. 9 is fixed by welding, and an appropriate spacer (not shown) is provided. I've been exposed to a lot of things.

The former is mainly used in liquid-liquid heat exchangers,
By employing a structure in which the gasket 2 is used to seal between the plates 1, applications are limited to low pressures of about 20 kg/cyst G or less and low temperatures of about 200°C or less.

On the other hand, in the case of the latter, most of them have a usage limit of less than 1 kf/cd G, and their use is limited to low-pressure gas heat exchangers.

Therefore, the present invention provides a plate that can withstand higher temperatures and pressures as a heat transfer element, thereby making the heat exchanger more compact, lighter, and less expensive. The aim is to provide a replacement device.

Means to Solve the Problems The present invention improves heat transfer in a plate heat exchanger by stacking a plurality of plates each having a concave and convex arrangement and allowing fluid to flow between these plates. This is designed to improve the rate, pressure resistance, etc.

More specifically, the plate heat exchanger according to the present invention includes:
A plurality of plates in which convex portions and concave portions have contact points and are arranged alternately in a lattice pattern and are smoothly continuous at each contact point are alternately turned over, and the positions of adjacent convex portions of each of these plates are determined. The plates are brought into contact with each other so that the fluid flows through the gaps formed between the plates.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram conceptually showing a plate heat exchanger according to this embodiment.

In the figure, a plurality of plates 6 are stacked at intervals from each other. The gap between each plate 6 is such that two adjacent plates 6 have both ends 7 and these both ends 7.
Both end portions 8 at positions orthogonal to each other are alternately welded layer by layer to form flow paths 9 and 10 which are perpendicular to each other in each layer. Different fluids flow through these flow path areas and 10 to perform heat exchange.

The plates 6 stacked in this manner are tightened by a backup plate 11 and tie rods 12 depending on the internal pressure. Then, if a manifold (not shown) is installed, which serves as an inlet and outlet for the fluid flowing through the channels 9 and 10,
The plate heat exchanger is completed.

Although the outline of the plate heat exchanger according to this embodiment has been described above, the feature of the plate heat exchanger according to this embodiment lies in the shape of the plates 6 and the way they are stacked. This will be explained below.

FIG. 2 is a partial plan view of the plate 6.

As shown in the figure, the plate 6 has a substantially hemispherical recess 13.
are arranged in a grid pattern. Further, on the plate 6, substantially hemispherical convex portions 14 are arranged in a lattice shape, each of which is sized to be inscribed in each of the four concave portions 13 forming one lattice.

Figure 3 is the same as Figure 2! -1 sectional view, plate 6
The stacked state is shown together with adjacent upper and lower plates 6' and 6'.

In the figure, the plates 6' and 6'' are stacked with the plate 6 turned over.The tips of the protrusions 14a and 14b of the plate 6 and the protrusions 14a' and 14b' of the plate 6' Each plate is positioned so that the tip of the plate comes into contact with the tip of the plate.

In this way, a flow path 15 is formed between the plate 6 and the plate 6', that is, in the gap on the side where the convex portions 14 are in contact with each other. On the other hand, similarly, a flow path 16 is formed between the plates 6 and 6'', that is, in the gap on the side where the recesses 13 are in contact with each other. The flow direction of each fluid in the channel 16 is approximately the same as the direction of the lattice of the convex portions 14 and the concave portions 13, which are arranged in a lattice-like manner (direction of arrows A and B in FIG. 2).Flow path 15 The relationship between the flow path 16 and the flow path 16 corresponds to the relationship between the flow path 9 and the flow path 10 conceptually shown in FIG.

FIG. 4 shows the IV-IV cross section of FIG. 2, that is, the cross section including the contact point between the concave portion 13 and the convex portion 14 of the plate 6, together with the plate 6/.

As shown in the figure, the shapes of the recess 13 and the projection 14 are determined so that the plate 6 is smoothly continuous at the contact point between the recess 13 and the projection 14.

Next, the effect will be explained.

As shown in FIG. 3, different fluids flow through channels 15 and 16 alternately formed between each plate 6. As shown in FIG. At this time, the channels 15 and 16 include the convex portion 14 and the concave portion 1 of the plate 6.
3 protrudes from each other, so the flow of each fluid expands and
As the contraction is repeated, the turbulence effect is amplified. Due to this turbulent flow effect, the heat transfer coefficient increases and the heat transfer wall surface becomes less likely to be contaminated.

Moreover, each plate 6 has a concave portion 13 or a convex portion 1
Since the 4 pieces are stacked in contact with each other at multiple points, the pressure resistance is increased.

Furthermore, the plate heat exchanger according to this embodiment has a recess 13.
Since the plate 6 is arranged to be smoothly continuous at the contact point between the plate 6 and the convex portion 14, thermal stress can be released as distortion of the plate 6, and the plate 6 is strong against thermal shock. Moreover, pressure resistance is further improved. Therefore, it is possible to practically manufacture a plate type heat exchanger up to about 100 kg/cdt G.

To explain this point in more detail, if the plates 6 are smoothly continuous, the buckling will be spherical and therefore very strong. For example, in Figure 6c.

As shown, if the concave portion 17 and the convex portion 18 do not continue smoothly and a step 19 is formed, that portion becomes a flat plate and becomes weak, resulting in a decrease in pressure resistance.

In FIG. 4, while maintaining the smooth continuity of the plate 6 at the contact point between the recess 13 and the protrusion 14, by making the recess 13 and the protrusion 14 different shapes, the flow path 16 and 15 can have a flow path shape depending on the properties of each fluid flowing through them.

Further, as shown in FIG. 5, the tip portions of the recesses 13 and/or the protrusions 14 of the plates 6 may be made partially flat to increase the contact area between adjacent plates 6. At this time, if the contact portions 20 of the two plates 6 are welded, the pressure resistance can be further improved.

In any of the above examples, the flow path 15 between each plate 6
The direction of fluid flow in and 16 is preferably in the direction of arrows A and B shown in FIG. 2, ie, along the grid. For example, if we consider the case where fluid flows in the directions of arrows C and D shown in Figure 2, the flow path becomes smaller (see flow path 15 shown in Figure 4), and there is a convexity in the center of the flow path. This is because the pressure loss increases due to the location of the concave portion (or concave portion), resulting in low performance VE.

Effects of the Invention As detailed above, the plate heat exchanger according to the present invention has a laminated structure of plates having a plurality of convex portions and concave portions whose shape and arrangement are devised, so that the plate type heat exchanger according to the present invention has a high heat transfer coefficient. At the same time, it can withstand high temperatures and pressures.

Therefore, since thin plates can be used for the plates, it is possible to make the plate heat exchanger more compact, lighter, and furthermore cost-reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram conceptually showing a plate heat exchanger according to the present invention, FIG. 2 is a partial plan view of a plate showing an example of the present invention, FIG. 3 is a sectional view of FIG. The figure is r in Figure 2.
FIG. 5 is a partial vertical sectional view of a plate showing another example of the present invention, FIG. 6a is a plan view showing a part of the plate to explain the present invention, and FIG. v in figure 6a
'+b-vrb sectional view, Figure 6C is Vl of Figure 6a
The c--C sectional view and FIGS. 7 to 9 are diagrams showing a conventional plate heat exchanger. 6.-Plate, 13.-Concave portion, 14.-Convex portion, 15.
16...Flow path. (Others/names) Figure 1 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] A plurality of plates in which convex portions and concave portions have contact points and are arranged alternately in a lattice pattern and are smoothly continuous at each contact point are alternately turned over, and the positions of adjacent convex portions of each of these plates are determined. A heat exchanger in which the plates are brought into contact with each other so as to allow fluid to flow through the gaps formed between the plates.