JPS6071894A - Plate type heat exchanger - Google Patents

Abstract

PURPOSE:To enable the abolishing of flames by a method wherein among plural plates at least a pair of adjacent plates at each outside end are united and jointed at supporting points at each surrounding and around openings and also between plates. CONSTITUTION:Gaskets 31, 41 are arranged at the space formed with each groove 13' and 14 between adjacent plates 11 at the confronting condition each other. And gaskets 91 are arranged at the ring type space formed with grooves 19 between adjacent plates 11. These gaskets are brazed between a pair of adjacent plates positioned at each outside end. On this consequence, adjacent plates 11 are united and jointed each other along a fringe 12 or the groove 13', 14 and around the opening 15-18, and are united and jointed also at the crossing supporting points 21 of the wave shaped parts 20. Adjacent plate pairs those are united and jointed by brazing at the both outerside ends are provided with high stiffness, and can be used in place of usual frames.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Technical Field This invention relates to an improvement in a plate heat exchanger consisting of a plurality of plates that join together to form alternating passages for a heat exchange medium between them.

(1) Prior Art Conventionally, in this type of heat exchanger, the plates are connected by a pair of gaskets between them in order to hold the plates in place and overcome the forces caused by the pressure of the heat exchange medium. It is tightened between the frames with bolts.

By the way, in view of the fact that this frame occupies a fairly large proportion of the entire heat exchanger in terms of weight and price, there has been a demand for a plate heat exchanger that does not use a frame.

OBJECT OF THE INVENTION The present invention aims to provide a lightweight and inexpensive plate heat exchanger that can meet such demands.

20 Structure of the Invention The plate heat exchanger of the present invention has alternating passages (A) (B) for the heat exchange medium between the palms and each other through a gasket.
) and further for directing media into and from said passageway (15) (2) to (18) and adjacent plates palming each other to form a support point (21) in said passageway; consisting of a plurality of plates (11) with corrugated portions (20), of which at least a pair of adjacent plates at each outer end have their peripheries (12) (13') (14)
It is also characterized in that it is permanently joined together around the openings (15) to (18) and further at the support points (21) between the plates.

According to the present invention, it is possible to provide a plate heat exchanger that is lightweight, has sufficient rigidity, and can withstand high medium pressure without relying on a support structure such as a conventional frame. Can be done. In addition, the plate heat exchanger of this invention eliminates the use of a large frame, requiring a smaller installation area, and can be manufactured at a much lower cost than conventional methods. It is.

Example (3) In FIG. 2, the plate (11) has grooves (13) and ridges (14) extending along the outer periphery and inside the periphery (12) so as to surround the heat transfer surface. We are prepared. These grooves (13) and ridges (14) appear as ridges (13') and grooves (14'), respectively, when viewed from inside the page. Each plate (11) is provided with four openings (15) to (18) allowing passage of the heat exchange medium. There is an annular groove or ridge around each opening. That is, the opening (15)
(16) has a groove (19) around it, and an opening (17) (1
There is a ridge (19°) around B). These grooves (1
9) and the ridges (19') are in an inverse relationship to each other on the front and back sides of the plate (11). As shown in the figure, diagonally arranged corrugated portions (20) are formed on the heat transfer surface of the plate (11). Note that the waveform portion may also have a herringbone shape.

The plurality of plates (11) are reversed between adjacent plates, so that one plate is aligned with its long axis as the center.
80°) and upside down (that is, rotated 180° on the plane of the plate) (4) and place the palms of each other. As a result, as shown in Fig. 3, the peripheral edge (12) or ridge (13°
) (14) is the peripheral edge (12) of the adjacent plate (11)
) or ridges (13') (14) (in the drawing, they are shown slightly apart for convenience of illustration) to define the spacing between the plates. Furthermore, between adjacent plates balanced against each other in the manner described above, the corrugations (2o) extend in different directions, thus providing support points (21) at their intersecting positions. Note that the number of plates (11) is appropriately selected so as to obtain a heat exchanger with a desired capacity.

As described above, adjacent plates (
11) Gaskets (31) (41) are arranged in the spaces formed by the grooves (13) and (14'), respectively. Further, a gasket (91) is arranged in an annular space formed by a groove (19) between adjacent plates (11).

Among these groups of plays 1-(11), at least between a pair of adjacent plates located at each outer end,
Braze the parts indicated by the thick lines (5) in Figure 3. As a result of this brazing operation, the adjacent plates (11) have a peripheral edge (12) or a ridge (13).
°) (14) and also along the openings (15) to (18
) are joined together. moreover,
The intersecting part of the waveform part (20), that is, the above-mentioned support point (2
Also in 1), they are joined together.

Alternate passages for the two heat exchange media are thus formed between the plates. That is, in FIG. 3, one medium a is opened at the opening (15) or (16
) into the first passage (A) and exits through the opening (16) or (15) serving as the outlet for medium a. The other medium flows into the second passage (B) through the opening (17) or (18), which is the inlet of the medium, and through the opening (18), which is the outlet of the medium.
) or flows out from (17). Note that (12) is a pipe body attached to the openings (15) to (18) of the outermost plate and connected to pipes for supplying and discharging the heat exchange medium. In the plate (6) located at the outer end where the tube body (22) is not provided, the openings (15) to (1) are closed.

A pair of adjacent plates on both outer ends, joined together by brazing, provides high rigidity and can replace a conventional frame. Note that, depending on the size and number of plates, the pressure of the medium, etc., this joining may be performed on multiple pairs of adjacent plates as shown in Figure 4. Especially when handling high-pressure media, all adjacent pairs may be joined. It is also possible to braze the plates (Fig. 5). However, it is advantageous to braze only the outermost pair of adjacent plates, considering the simplicity of the work and the low manufacturing cost.

The assembled plate heat exchanger is for example 6% i
It is attached to a predetermined location using a bracket (23) as shown in iO, and does not require a large amount of installation space.

In addition, an inlet/outlet nozzle for the heat exchange medium, that is, a pipe body (22)
(11), which also contributes to reducing manufacturing costs.

[Brief explanation of the drawing]

(7) Figure 1 is a schematic diagram of a conventional plate heat exchanger, Figure 2 is a plan view of the plates constituting the plate heat exchanger of the present invention, and Figures 3 to 5 are l-111 of Figure 2. FIG. 6 is a cross-sectional view of the plate heat exchanger along a line, and FIG. 6 is a perspective view of the plate heat exchanger. (11) - plate, (12) - periphery, (13) (1
4'") (19) - Groove, (13") (14)
-Ribule, (15) to (1B) -Opening, (20) -Corrugated part, (21) -Support point, (22) - Pipe body, (31)
(41) (91) - Gasket, (A) (B) - Medium passage. (8) Figure 1 ■ Figure 2

Claims (1)

[Claims] (1) abutment between adjacent plates with openings and adjacent plates that mate via gaskets to form alternating passages for the heat exchange medium between each other and for guiding the medium into and from said passages; comprising a plurality of plates with corrugations forming support points within said passageway, at least a pair of adjacent plates at each outer end of said plurality of plates forming a support point in said passageway; A plate heat exchanger, characterized in that the plate heat exchangers are permanently joined together at the support points of the plate heat exchangers.