JPS6051037B2 - Plate heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate heat exchanger, and particularly to a large plate heat exchanger whose heat transfer surface has a herringbone shape and is intended for large-capacity processing.

Generally, in a plate heat exchanger, for the purpose of large-capacity processing, when the herringbone is made into large waves with a relatively large pitch between the crests, the troughs on the heat transfer surface, which serve as fluid flow paths,
The cross-sectional area of the flow path is maximum at the center of the fulcrum where the peaks of adjacent heat transfer surfaces intersect, and there is a risk of a short bath for both the liquid to be treated and the medium liquid, resulting in a decrease in heat exchange efficiency. There is. Therefore, in view of the above drawbacks of large plate heat exchangers intended for large capacity processing, the present invention is an improvement and elimination of these drawbacks. The structure of the present invention will be described below with reference to embodiments shown in the drawings. In FIG. 1, the left half shows a part of the heat transfer surface when herringbone-shaped plates A and B are laminated together, and the right half shows only a part of the heat transfer surface of plate B.

The pitch between the peaks of each plate A and B is large for the purpose of large-capacity processing, and as shown in Figures 2 and 3.
As shown in the figure, the valley part 1 of plate B and the peak part 2 of plate A
The cross-sectional area of the flow paths 3 that intersect with each other is maximum. The same applies to the flow path 6 where the valley portion 4 of the plate A intersects with the peak portion 5 of the plate B which overlaps the upper surface of the plate A.
Reference numeral 7 denotes a protrusion protruding from the channels 3 and 6 that have the maximum cross-sectional area. In the channel 3, the protrusion J may be provided at the valley 1 of the plate B as shown in FIG. Alternatively, it may be provided on the peak portion 2 of the plate A.

The flow path 6 may be provided in the valley portion 4 of plate A or the peak portion 5 of plate B. By providing the protrusions 7 facing the channels 3 and 6 with the largest cross-sectional area in this way, for example, the liquid to be treated flowing in the valley 1 of the plate B and the medium flowing in the valley 4 of the plate A The fluid collides with the protrusion 7 in the channels 3 and 6, which have the largest cross-sectional areas, and becomes turbulent.

The liquid to be treated passes through a flow path formed by the fluid flowing along the troughs 1 of the plate B due to this turbulent flow and the back surface of the peaks 2 of the plate A that overlap in a state substantially orthogonal to the plate B. This prevents short baths. In short, the liquid to be treated is distributed over the entire heat transfer surface. In addition, since a plurality of channels are formed on the heat transfer surface by the valleys 1 of the plate B and the back surface of the peaks 2 perpendicular to the valleys 1, a protrusion is provided at each intersecting position. The turbulent flow caused by the protrusions 7 spreads over the entire area of the heat transfer surface, improving the heat exchange efficiency of the heat transfer surface. This also applies to the medium fluid flowing through the troughs 4 of the plate A. As explained above, the present invention provides a plate heat exchanger in which a fluid flow path is constructed by laminating plates having heat transfer surfaces in a herringbone shape, and the pitch between the peaks of the herringbone is set relative to the pitch between the peaks of the herringbone. A large wave is made large, and a protrusion is brought into contact with the fluid flow path where the trough of the heat transfer surface where the flow path cross-sectional area is maximum intersects with the crest of the adjacent heat transfer surface, from the trough or peak. Therefore, the fluid flowing through the channel having the maximum cross-sectional area becomes turbulent due to the protrusions, prevents short baths, and flows over the entire heat transfer surface.

Therefore, it has excellent heat exchange efficiency as well as turbulent flow effect, and plays an important role in this type of large heat exchanger.

[Brief explanation of the drawing]

Fig. 1 is a partial plan view showing simultaneously the case where the herringbone-shaped plate according to the present invention is laminated by polymerization and the case of a single unit, Fig. 2 is a sectional view taken along the line ■-■, and Fig. 3 is a cross-sectional view taken along the line ■-■. FIG. A, B... Plate, 1... Valley part of plate B, 2... Mountain part of plate A, 3, 6...
...Flow path, 7...Protrusion.

Claims (1)

[Claims] 1. In a plate heat exchanger in which a fluid flow path is constructed by laminating plates having heat transfer surfaces in a herringbone shape, large waves with a relatively large pitch are formed between the peaks of the herringbone, and the flow It is characterized in that a protrusion is provided protruding from the valley or peak in the fluid flow path where the peak of the heat transfer surface that is adjacent to the valley of the heat transfer surface where the path cross-sectional area is maximum intersects. Plate heat exchanger.