JPS6222787Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a plate heat exchanger.
The purpose is to construct a one-pass designed flow path having different flow characteristics for two heat exchange media while keeping the gap between the plates constant.

Generally, each flow path in a plate heat exchanger is designed to have certain characteristics, so when there is a difference in flow factors such as flow rate or viscosity between two heat exchange media, the flow rate is low or Either a method of flowing a non-viscous fluid in multiple passes must be used, or a single pass must be used to resolve the unavoidable decrease in flow velocity. Even if there is, the pressure loss will be large. Therefore, if it is intended to suppress the pressure loss to an allowable level, the flow velocity of the heat exchange medium on the multiple pass side must naturally be reduced. Further, in the latter case, an increase in the flow velocity cannot be expected, and as a result, the heat transfer coefficient also decreases, which has the disadvantage that the design must be performed in a state far from the optimum design.

The present invention is an attempt to eliminate the above-mentioned drawbacks and construct a flow path with a one-pass design without multiple passes, and the configuration will be explained below with reference to the drawings. 1 is a plate, 2 is a fluid inlet/outlet, 3 is a heat transfer surface, and 4 is a herringbone-type peak formed on the heat transfer surface. 5 is a two-row herringbone-style mound,
As shown in FIG. 2, among the three peaks 4 in the upper part in FIG. 1, the center peak is made into two rows of small peaks,
The mountain portions 4 and the small mountain portions 5 are arranged every other place. 6 and 7 indicate the distances between the contact points of the peaks and valleys when the plate 1 of FIG. 2 is rotated 180 degrees and stacked next to the plate 1 of FIG. 1. 8 is the inter-plate gap.

Since the present invention has the above-mentioned configuration, if one plate 1 is rotated 180 degrees and stacked one on top of the other in turn, the sky surface will be stacked as shown in Figure 3. Further, its cross section is as shown in FIGS. 6 and 7. Therefore, the gap between the plates is constant, and the heat transfer surface of adjacent plates is
The distance 7 between the contacts is long in the portion where the plurality of hill portions 5 are present, and the pressure loss to the fluid flowing therebetween is small. On the other hand, in the portion where the peaks 4 are continuously formed, the distance 6 between the contacts is short, and the pressure loss is large. In FIG. 6, on the surface side of the plate 1, the distance between the contacts 6' and 7' is 6'<7', whereas the distance 6' is 6'<7'. In this way, even if the gap between the plates is constant, by forming a small peak part that does not contact the valley part of the plate adjacent to a part of the peak part on the heat transfer surface, the plate can be By making a relative difference in the cross-sectional area of the opposing flow paths, one wide and the other narrow, it was possible to obtain flow characteristics with low pressure loss for liquids with high viscosity or large flow rates. It should be noted that the characteristics of one heat exchange medium were configured so that the characteristics of the other heat exchange medium were quite flexible.

Figure 8 shows the cross-sectional shape of the fluid undergoing heat exchange on the front and back surfaces of the plate.
It is clear that this is applicable to cases where the fluid 9 and the fluid 10 have different flow rates or different flow characteristics such as viscosity.

In addition, in the present invention, part of the peaks on the heat transfer surface of the plate may be changed depending on the type of heat exchange medium so that it does not come into contact with the valleys of the adjacent plate.
The formation ratio is herringbone, for example, when ordinary peaks and small peaks are formed alternately, when the peaks are continued every five steps and a small peak is inserted between them, or when the heat transfer surface of one plate is formed. Various embodiments are recognized, such as a case in which hill portions are provided alternately with mountain portions only in the lower part where the fluid flows.

[Brief explanation of the drawing]

Fig. 1 is a front view of the plate, Fig. 2 is a front view of the plate with a hill portion, Fig. 3 is a front view showing the stacked state of the heat transfer surface portion, and Fig. 4 is an enlarged view taken along the line X-X of Fig. 1. 5 is an enlarged sectional view taken along the Y-Y line in FIG. FIG. 3 is a cross-sectional view showing the cross-sectional shape of fluid to be exchanged. 1...Plate, 3...Heat transfer surface, 4...Mountain part,
5... Hill area, 8... Gap between plates.

Claims (1)

[Scope of utility model registration request] A large number of plates having herringbone-shaped peaks are laminated and fixed using gaskets so that the peaks and valleys are in contact with each other, and heat exchange between the two liquids is carried out through these plates. In a plate heat exchanger designed to perform
The gap between the plates is constant, and some of the herringbone peaks on the heat transfer surface of the plate are formed into a plurality of small peaks, with the central peak of three parallel peaks forming a plurality of small peaks. A feature is that a portion is provided that does not come into contact with the trough, and a relative difference is created in the cross-sectional area of the flow path facing each other via the plate in this portion, thereby obtaining flow characteristics that correspond to the viscosity and flow rate of the two liquids. Plate heat exchanger.