JPH0264399A - plate heat exchanger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a plate heat exchanger, and more particularly to an improved structure for an inlet/outlet of a heat exchange medium.

(Prior Art) A plate heat exchanger is constructed by bundling a large number of heat exchange plates between a pair of frame plates. Each heat exchange plate has ports interconnecting the passages of one medium and ports interconnecting the passages of the other medium, typically these are e.g. to 2
They are arranged in pairs, with two at the bottom and two at the bottom. These ports are aligned and communicate only with their respective media passages, and media is introduced into and taken out of each passage through media ports provided in the frame plate.

Conventionally, the medium inlet/outlet has generally been constituted by a nozzle 1.2 for connection to piping for supplying and discharging the medium, as shown in FIG.

[Problem to be solved by the invention]

If the pitch L of adjacent ports is smaller than the sum of the radii of the nozzle flanges 3.4, it is necessary to make a difference in the length of the nozzles 1.2 to prevent the flanges 3.4 from interfering with each other. However, there is a drawback that the provision of a nozzle increases the manufacturing cost accordingly.

Therefore, as shown in Fig. 5, a structure without a nozzle is constructed by lining the through hole 6 made in the frame Fi5 with a synthetic rubber or metal material and connecting the pipe flange of the pipe directly to the frame plate 5. is generally adopted.

However, as explained in Fig. 4, when the pitch L of adjacent ports is smaller than the sum of the radii of the pipe flanges, if the pipe flanges of the piping are connected directly to the frame plate, the flanges will interfere with each other and cannot be installed. Therefore, such a lining structure could not be adopted for small heat exchangers. Furthermore, in order to directly press the frame plate, a large machine tool that can attach the entire frame plate is required, which is also impractical from this point of view.

The main object of the invention is to provide an improved media inlet/outlet structure for plate heat exchangers of the above-mentioned type, which contributes to cost reduction and which can also be used in small heat exchangers.

[Means to solve the problem]

In this invention, a through hole is provided in the frame plate in alignment with the position of the port of the heat exchange plate, a boss whose inner surface is lined is fitted into the through hole, and a pipe flange of the piping is attached to the outer end surface of the boss. I tried to connect.

〔Example〕

Referring to FIG. 1, which shows one embodiment of the invention, frame plate 12 is provided with through holes 14, 16 aligned with the locations of ports in a heat exchange plate (not shown).
．． By fitting bosses 18, 20 into 16, an inlet/outlet for the heat exchange medium is formed. The boss 18.20 has a hollow cylindrical shape, has a counterbore on both end faces, and is lined with a lining 22.24 over the inner surface and the counterbore. - Metal may be used as the lining material, or an integrally molded material such as synthetic rubber may be inserted; in any case, the lining material should be determined taking into account the characteristics of the medium. It is something.

By applying lining, the material of the boss can be selected regardless of the medium.

It is advantageous in terms of manufacturing control to make all the bosses the same length. However, when the distance between adjacent ports, and therefore also the center-to-center distance of the bosses, is less than the sum of the radii of the pipe flanges of the piping connecting to those bosses, especially in small heat exchangers, Avoid interference between flanges by making the lengths different. In this case, as mentioned above, there are no restrictions on the material of the boss, so even if one boss is made longer, the effect on cost is small. The difference in length between the bosses ΔH is set to be larger than the total dimension of the thickness of the flange and the thickness of the seal gasket used therein. In this way, the pipe flanges will not interfere with each other. The pipe flange of the piping is connected to the end face of the boss,
Bolts are screwed into the screw holes 26 of the frame plate 12 and fastened.

The shape of the boss is not particularly limited; for example, the shape of the boss
As shown in the figure, the counterbore may be eliminated, or as shown in Fig. 5, the screw hole 26 for attaching the piping flange can be provided on the end face of the boss. [Effects of the Invention] Rather than lining,
Since the lined boss fits into the through hole of the frame plate, it is much easier to line a thick (and heavy) frame plate, and does not require large machine tools. Even when the distance between ports is short, interference between pipe flanges can be avoided by making the boss lengths different.Furthermore, since there is a lining, the material of the boss is not subject to restrictions due to the characteristics of the medium. Therefore, even if a somewhat long boss is used, the effect on the cost of the nozzle is not large.As described above, the present invention provides an economical medium inlet/outlet structure that can be applied to small-sized ones. A plate heat exchanger can be provided.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a frame plate showing an embodiment of the present invention, Figs. 2 and 3 are sectional views of a boss portion showing another embodiment of the invention, and Fig. 4 shows a conventional technique. A plan view of a frame plate. FIG. 5 is a sectional view of a frame plate showing another conventional technique. 12: 14. 18. 22. 26: Frame plate 16; Through hole 20: Boss 24; Lining screw hole Patent applicant: Hisaka Seisakusho Co., Ltd.
Rijin Gangwon Province Go No. 4
Figure @ Figure 2 Figure 5 Figure 3

Claims (4)

[Claims] (1) A large number of heat exchange plates are bundled between a pair of frame plates, and passages for different media are formed on both sides of each heat exchange plate, with ports connecting the passages for one medium to each other and the other. In a plate heat exchanger in which a heat exchange plate is provided with ports that communicate media passages with each other, a through hole is provided in the frame plate in alignment with the position of the port in the heat exchange plate, and the through hole is inserted into the inner surface. A plate-type heat exchanger, characterized in that a lined boss is fitted into the plate, and a pipe flange of the piping is connected to the outer end surface of the boss. (2) The plate heat exchanger according to claim 1, characterized in that the lengths of the bosses are made to differ when the distance between the centers of adjacent bosses is smaller than the sum of the radii of pipe flanges of the pipes connected to the bosses. exchanger. (3) The plate heat exchanger according to claim 1, wherein the frame plate is provided with screw holes for receiving bolts for fixing pipe flanges of the piping. (4) The plate heat exchanger according to claim 1, wherein the end face of the boss is provided with a screw hole for receiving a bolt for fixing a pipe flange of the piping.