JPH0351669Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a plate heat exchanger among heat exchangers.

(Prior Art) A heat exchanger that uses a plate as a partition between two fluids and performs heat exchange using the partition as a heat transfer wall surface is generally called a plate heat exchanger.

FIGS. 5 to 7 show conventional examples of such plate heat exchangers.

In other words, the conventional plate heat exchanger
As shown in the figure, a plurality of plates 1 are stacked at intervals, and a gasket 2 is placed between the peripheries of each plate 1.
is interposed and a group of laminated plates are tightened with tie bolts (not shown), and the two fluids flowing between each plate 1 are sealed by each plate and the gasket. .

The plate 1 is a plate pressed into a shape as shown in FIG. 6, for example. Another example of a plate heat exchanger is a type in which plates 3 having a shape as shown in Fig. 7 are stacked and two opposing sides of the plates 3 are alternately welded to form a flow path. There are also some.

Furthermore, in these conventional plate heat exchangers, as a method of preventing deformation of the plates due to internal pressure, plate 1 in FIG. A method of fixing them by welding each other is used, and a suitable spacer (not shown) is provided.

The former is mainly used in liquid-liquid heat exchangers, but by adopting a structure in which gasket 2 seals between plates 1, it can be used at low pressures of about 20 kg/cm ² G or less and about 200°C or less. Limited to low temperature applications. In the latter case, most of them have a usage limit of 1 Kg/cm ² G or less, and their use is limited to low-pressure gas heat exchangers.

(Problems to be solved by the invention) In the conventional plate heat exchanger, the formation of the convex portions and concave portions of the plates is limited to one direction, so the strength of each plate against high temperature and high pressure is limited. You can get it in one direction, but you can't expect it in the other direction.
In the orthogonal flow of two fluids using each plate as a partition wall, there is a limit to increasing the heat transfer coefficient, and as mentioned above, the applications are limited, and there are problems such as the inability to make the device compact and lightweight.

(Means for Solving the Problems) The present invention provides a plate heat exchanger for dealing with the above-mentioned problems. A plurality of rows of projections are arranged in parallel at intervals, oriented vertically on one side of each plate and horizontally on the other side, forming a row of vertical projections and a row of horizontal projections, and each adjacent plate is arranged upside down. By providing diagonal wavy flow paths with each plate serving as a partition wall through contact between the vertical protrusion rows and the horizontal protrusion rows, the heat resistance, pressure resistance strength, and heat transfer coefficient of the plates are improved. is improving.

(Function) A plurality of zigzag-shaped vertical projection rows arranged in parallel at intervals on one side of each plate, and a plurality of zigzag-shaped rows arranged in parallel at intervals on the other side of the same plate. By interchanging the horizontal projection rows, the vertical projection rows and the horizontal projection rows by turning them over,
Each plate has high heat resistance and pressure resistance in the vertical and horizontal directions, and is formed by the abutment of the vertical and horizontal protrusion rows, with each plate serving as a partition wall. Due to the flow passages, the fluid in each wavy flow passage becomes a turbulent wavy flow, and the wavy flows on both sides of each plate form a relatively oblique flow to enhance heat exchange.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4.

FIG. 1 shows a perspective view of a plate heat exchanger according to the present invention, in which a plurality of plates 6 are stacked at mutually spaced intervals. Two adjacent plates 6 are alternately welded step by step at both ends 7 and at both ends 8 perpendicular to these ends 7 to form orthogonal passages 9 and 10. Separate fluids are flown through and heat exchange occurs between them. The stacked plates 6 are tightened by a strengthening backup plate 11 and tie rods 12 according to internal pressure. Then, a manifold (not shown) that serves as an inlet and an outlet for the fluid flowing through the channels 9 and 10 is installed.
The plate heat exchanger is completed.

The present invention is characterized by the plate 6, as shown in FIG.
A large number of long protrusions 13 having the same shape are recessed on the other surface (lower surface in the figure) of the plate 6, and a plurality of long protrusions 14 are sequentially arranged in a row with a reverse slope as shown in the figure. , 13 in a zigzag shape are oriented in the vertical direction (in the vertical direction in the figure) on one side of each plate 6, and in the horizontal direction (in the horizontal direction in the figure) on the other side. The vertical protrusion rows 14 and the horizontal protrusion rows 13 are arranged in parallel at intervals.

Furthermore, as shown in FIGS. 3 and 4, the plates 6 are alternately turned upside down and stacked, and the adjacent longitudinal protrusion rows 14... mutually and the adjacent transverse protrusion rows 13... are brought into contact with each other and fixed (welded). ), and diagonal wavy flow paths 15 and 16 with each plate 6 as a partition wall are provided on one side and the other side of the plate 6.

6' and 6'' shown in FIGS. 3 and 4 indicate plates in an inverted arrangement, a and b indicate the flow directions of the two fluids, and the flow directions of fluids a and b are oblique currents in each part, It becomes a wavy flow.

The embodiment of the present invention has the above-mentioned configuration, and the plurality of zigzag vertical projection rows 14 on one side and the plurality of zigzag horizontal projection rows 13 on the other side provided on each plate are Since each plate 6 is formed of a plurality of long protrusions 14 and 13 that are arranged in a row in a reversely inclined arrangement, it is possible to form zigzag rows of vertical and horizontal protrusions on the same plate, and each plate 6 has vertical and horizontal protrusions.
It has the strength to withstand high temperature and pressure in the lateral direction, and the strength of each plate is greatly increased by the fact that the vertical protrusion rows and the horizontal protrusion rows are in contact with each other due to the upside-down arrangement, and by welding and fixing the contact parts. ing.

Further, the fluids a and b flowing on one side and the other side of each plate 6 become a zigzag flow in the respective wavy flow paths 15 and 16, and become turbulent, and The relative flow of fluids a and b becomes a wavy flow which becomes an oblique flow in each part, and the heat exchange rate is increased.

As a specific example, comparing the case where the protrusions on one side and the other side of the plate are simply arranged perpendicularly, and the case where the protrusions are arranged in a wavy flow as in the present invention, the difference in the front side of the inlet of the plate heat exchanger When air is flowed at a flow rate of 2 to 19 Kg/m ³ sec, the plate surface heat transfer coefficient is 1.2 to 1.3 for the latter (this invention), when the former is 1, and it has been confirmed that the heat transfer coefficient is large. Ta.

Note that when the protrusion rows 14..., 13... are formed by a plurality of long protrusions 14, 13 as described above, a gap is formed between each long protrusion, but the ends of each long protrusion are By forming the arcuate shape, mixing of fluids is promoted at the same intervals, and an adverse effect as a dead zone is prevented.

(Effects of the invention) The plate heat exchanger according to the invention has the following features: (1) A plurality of zigzag-shaped vertical protrusion rows are arranged in parallel at intervals on one side of each plate, and on the other side of the plate. Similarly, multiple rows of horizontal protrusions are arranged in parallel at intervals, and due to the upside-down arrangement, the vertical and horizontal protrusion rows are in contact with and fixed to each other, making each plate heat resistant both vertically and horizontally. , the pressure resistance is significantly increased.

(2) The two fluids in the diagonal wavy flow path with the laminated plates as partition walls are as follows:
Each becomes a turbulent flow with a wavy flow,
Since the wavy flows on both sides of each plate relatively exchange heat, the heat transfer coefficient is significantly increased and the heat exchange performance is improved.

(3) Therefore, it can be made smaller and more compact, as well as lighter in weight, and its uses can be greatly expanded.

[Brief explanation of drawings]

Figure 1 is an overall perspective view of the plate heat exchanger of the present invention, Figure 2 is a plan view showing the plate shape of the present invention, Figure 3 is a sectional view taken along the - line in Figure 2, and Figure 4 is a Fig. 5 is a front view showing an example of a conventional plate shape, Fig. 6 is a sectional view of an example of a conventional plate, and Fig. 7 is a sectional view of another conventional plate. FIG. 6, 6', 6''... plate, 13, 14... long projection, 15, 16... wavy flow path,
a, b...fluid.

Claims (1)

[Scope of utility model registration request] In an orthogonal type heat exchanger in which orthogonal flow paths are formed between stacked plates using the plates as partition walls, a plurality of zigzag-shaped protrusion rows consisting of a plurality of long protrusions arranged in rows are arranged on one side of each plate. The longitudinal protrusion rows and the transverse protrusion rows are arranged vertically on one side and horizontally on the other side, spaced apart and parallel to each other, and the longitudinal protrusion rows and the transverse protrusion rows are arranged between each adjacent plate by being reversed. 1. A plate heat exchanger characterized in that diagonal wavy flow paths are provided in which each of the plates serves as a partition wall by abutting the rows against each other.