JPH053913Y2 - - 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 wall between two fluids and performs heat exchange using the partition wall as a heat transfer wall surface is generally called a plate heat exchanger.

7 to 9 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. 8, for example. Another example of a plate heat exchanger is a type in which plates 3 having a shape as shown in Fig. 9 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 for preventing deformation of the plates due to internal pressure, plate 1 shown 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 the same. 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. Plates provided with a plurality of rows of protrusions are alternately turned over and stacked two by two to form a set of two plates, and the protrusions are brought into contact with each other and fixed to form a longitudinal flow path, and the two plates are stacked one on top of the other. A lateral flow path is formed by shifting the protrusion arrangement of the plates by half a pitch in the lateral direction and placing the plates on top of each other with an interval between the plates, and providing an oblique wavy flow path using each of the plates as partition walls. This improves the plate's heat resistance, pressure resistance, and heat transfer coefficient.

(Function) Plates each having a plurality of zigzag rows of long protrusions arranged in rows are alternately turned over and stacked two by two to form a set of two plates, and the protrusions are brought into contact with each other. Each of the plates is fixed to form a vertical flow path, and the protrusion arrangement of the pair of plates is shifted horizontally by half a pitch, and the plates are overlapped with a gap between them to form a horizontal flow path. By providing diagonal wavy flow paths with partition walls, the heat resistance and pressure resistance of the plate as well as the heat transfer coefficient are improved.

In particular, since the other fluid flowing in the lateral direction repeatedly expands and contracts three-dimensionally, the heat exchange efficiency is further improved.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

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 backup plate 11 and a tie rod 12 with a strength corresponding to the internal pressure. Then, a manifold (not shown) serving as an inlet/outlet for the fluid flowing through the channels 9 and 10 is attached to complete the plate heat exchanger.

The present invention is characterized by the plate 6, as shown in FIG. 2, a large number of elliptical long protrusions (13) are provided on one surface (upper surface in the figure) of the plate 6, and are arranged in reversely inclined rows as shown in the figure. The structure is such that the protrusion rows 13, . . . consisting of a plurality of long protrusions provided are closely parallel to each other and oriented in the longitudinal direction of the plate.
A pincushion-shaped flat portion 17 is left between the ends of four adjacent long protrusions 13.

Furthermore, as shown in FIGS. 3 and 4, the plates 6 are alternately turned over and stacked two by two to form a set of two plates, and the protrusion rows 13... are brought into contact with each other and fixed. As a set of sheets, a vertical flow path 14 for one fluid a is formed.

FIG. 5 is a diagram showing the contact portions (black portions) when the plates 6, 6' are stacked. When the plates 6 and 6' are turned over and placed one on top of the other, the elongated projections 13 are brought into contact and fixed at their top surfaces 16. As a result, the two plates 6 and 6' come into contact with each other in a zigzag pattern with an interval between them.

Below the pair of plates 6, 6', a pair of similar plates are stacked one on top of the other with the protrusion arrangement shifted by half a pitch in the lateral direction with respect to the flow direction of the fluid a. A lateral flow path 1 for the other fluid b is arranged between the plates 6 and 6'.
form 5.

Figure 6 shows the contact area (black area) when a set of two plates 6, 6' and plate 6'' are overlapped.
FIG.

When the plates 6, 6' and the plate 6'' are overlapped, they are shifted by half a pitch in the flow direction of the fluid b, but as mentioned above, there is a pincushion-shaped flat surface between the four long protrusions 13,... Since the surfaces 17 remain, when they are shifted laterally, they are brought into contact and fixed at multiple points at flat portions in the flow direction of the fluid b.

As a result, a vertical flow path 14 for one fluid a and a lateral flow path 15 for the other fluid b perpendicular thereto are formed as wavy flow paths on both sides of the plate.

The embodiment of the present invention has the above-mentioned structure, in which plates each having a plurality of zigzag rows of long projections arranged in rows are alternately turned over and stacked two by two. Each plate is made into a pair, and the protrusions are brought into contact with each other and fixed to form a vertical flow path, and the protrusion arrangement of each pair of plates is shifted horizontally by a half pitch, and the plates are stacked at intervals. Each plate has strength to withstand high temperature and high pressure in the vertical and horizontal directions because they are placed together and abutted and fixed at the flat parts of the upstream and downstream ends of the protrusion to form a horizontal flow path. In addition, the strength of each plate is significantly increased by abutting the protrusion rows and the flat parts with each other due to the upside-down arrangement, and by welding and fixing the abutting parts.

In addition, the fluid flowing on both sides of each plate, in each wavy flow path,
The flow becomes zigzag and turbulent, and the relative flow of fluids a and b between one side and the other side of the plate becomes a wavy flow, increasing the heat exchange rate.

In addition, at the downstream end of each long protrusion, the flow becomes a zigzag flow that allows them to merge without a dead zone, resulting in turbulent flow, and the flow on both sides of the plate becomes a wavy flow with oblique flow in each part, causing heat generation. Exchange rate is increased. In particular, the lateral flow path formed by shifting a set of two plates by half a pitch repeats three-dimensional expansion and contraction, making it possible to further enhance heat exchange.

(Effects of the invention) The plate heat exchanger according to the invention has the following features: (1) Rows of vertical protrusions consisting of a large number of long protrusions are closely arranged in parallel in a zigzag shape, and a set of two plates is arranged horizontally. By stacking them on top of each other with a half-pitch shift in the direction, the heat resistance and pressure resistance of each plate are significantly increased both vertically and horizontally.

(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,
In particular, the flow path for fluid b, which is formed by shifting a set of two plates by half a pitch, waves up and down, and repeats expansion and contraction in three dimensions, so the turbulent flow promotion effect is significant and the heat transfer coefficient is increased. The heat exchange performance has been significantly improved.

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

It has the following effects.

[Brief explanation of drawings]

Figure 1 is a block diagram of the plate heat exchanger of the present invention, Figure 2 is a partial plan view of the plate of the present invention, Figure 3 is a plan view showing the overlapping state of the plates, and Figure 4 is a partial plan view of the plates of the present invention. 5 is a plan view showing the contact portion of the protrusion, FIG. 6 is a plan view showing a set of two plates stacked one on top of the other after being shifted laterally, and FIG. 7 is a sectional view taken along line - in the figure. FIG. 8 is a plan view of a conventional plate, FIG. 8 is a sectional view of the conventional plate, and FIG. 9 is a partial perspective view showing another example of the conventional plate. 6, 6', 6''... Plate, 9, 10... Channel, 13... Long projection, 14, 15... Channel, 16
...Top surface, 17...Flat surface.

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, plates each having a plurality of zigzag rows of long projections arranged in rows are alternately arranged. Each plate is turned over and stacked two by two to form a set of two plates, and the protrusions are brought into contact with each other and fixed to form a vertical flow path, and the protrusion arrangement of the two sets of plates is horizontally aligned by half a pitch. A diagonal wavy cross-section is formed by overlapping the plates with an interval between them to form a lateral flow path, and using the plates as partition walls.
A plate heat exchanger characterized by having a flow path.