RU2418253C1 - Bellows-type heat exchanger - Google Patents

Abstract

FIELD: power industry.

SUBSTANCE: in welded plate-type heat exchanger consisting of casing and cassettes placed inside it and made from round membranes welded to each other along inner and outer outlines, the cassettes are made in the form of weld bellows, and membranes have one hole which is located immediately at external outline of membrane. At that, each next ruffle of bellows, which is formed of two membranes, is located so that its internal hole is diametrically opposite to hole of the previous ruffle.

EFFECT: improving heat exchange between media, simplifying the heat exchanger design and heat exchanger assembly.

5 dwg

Description

Well-known plate heat exchangers, widely distributed in everyday life, energy, chemical industry and other fields.

Plate heat exchangers include domestic heaters made of plates, plate heat exchangers with gaskets, welded plate heat exchangers, etc. In our opinion, the latest heat exchangers are closest in design to the invention proposed in this application and can serve as an analogue. Consider the device of the welded plate heat exchanger "GEAShell" company MASHIMPEKS, following its description on the website of the company www. mashimpeks.ru/cat/geshell, published in 2007. The heat exchanger is based on identical round plates with two openings. In Fig. 1, the plate is marked with the number 1. Cross sections of two such plates located to each other by the protrusions are marked with the number 2. Two plates are centered along the internal holes and then welded to each other along the contours of these holes (in Fig. 1, these are welds with numbers 3). The pairs of plates obtained in this way are connected to each other by welding along the outer contours (in figure 1 these are welds with number 4), forming a cartridge (in figure 1. the cartridge is marked with the number 5), which has an internal volume. The cartridge may consist of an arbitrary number of plates. The cassette is a rigid structure, i.e. the plates of its components cannot move relative to each other.

The GEAShell welded plate heat exchanger is shown in FIG. The cassette 5 is installed in the casing (figure 2, the casing is marked with the number 6). For simplicity, a heat exchanger with one cartridge is shown. In fact, there can be several cassettes. They can be connected to each other both in parallel and in series. Two media enter the heat exchanger. One enters the casing from the outside of the cassette 5, and the other enters the inside of the cassette. From figure 2 it is seen that both environments before leaving the heat exchanger, pass only between one any pair of plates. Here, bold arrows indicate the movement of the medium outside the cassette, and thin arrows show the movement of the medium inside the cassette.

A welded bellows is also known, in which there is no through hole. A description of this bellows is given in the abstract published in the journal "Inventions", No. 8, 1995, the number of the application for the invention 92006729/29. The design of such a bellows is similar to the design of the cartridge. The welded bellows for the heat exchanger are made of identical round membranes with one hole, which is located directly at the outer contour of the membrane. In Fig. 3, the membrane is marked with the number 7. Cross sections of two such membranes located to each other by the protrusions are marked with the number 8. Two membranes are centered on the inner hole and then welded along the contour of this hole (in Fig. 3, this is weld 3). The resulting design of two membranes is called the "corrugation" of the welded bellows. The welded bellows (in figure 3, the welded bellows is indicated by the number 9) consists of an arbitrary number of corrugations. Moreover, each subsequent corrugation in the bellows is located so that its inner hole is diametrically opposite to the hole of the previous corrugation. The corrugations are connected together along the outer contours by welding (in Fig. 3 these are welds 4), forming a welded bellows, which has an internal volume. A welded bellows is not a rigid structure - bellows corrugations are able to move relative to each other.

The bellows heat exchanger is depicted in figure 4. The welded bellows 9 is installed in the casing (figure 4. The casing is indicated by the number 6). Figure 4 shows for simplicity, a single-bellows heat exchanger. In fact, there may be several bellows. They can be connected to each other both in parallel and in series. Two media enter the heat exchanger. One into the casing from the outside of the bellows 9, and the other into the bellows. From figure 4 it is seen that the environment outside the bellows before leaving the heat exchanger, passes only between any one pair of membranes. The medium flowing inside the welded bellows passes all the corrugations (pairs of membranes). 4, bold arrows indicate the movement of the medium outside the bellows, and thin arrows show the inside of the bellows.

The invention is aimed at achieving the following technical results: improving heat transfer between media; simplification of the design of the heat exchanger; simplification of heat exchanger assembly.

This is achieved by the fact that in a welded plate heat exchanger, consisting of a casing and cassettes placed inside it, made of round membranes, welded to each other along internal and external contours, the cassettes are made in the form of welded bellows, and the membranes have one hole that is located directly at the outer contour of the membrane, with each subsequent bellows corrugation formed of two membranes, located so that its inner hole is diametrically opposite to the hole of the previous corrugation.

There are the following fundamental differences of the proposed heat exchanger from the analogue.

1. In the GEAShell heat exchanger, heat transfer occurs due to the passage of media only between some two plates of the cartridge, while in a welded bellows one of the media passes inside all the corrugations, due to which this medium receives (or gives) a significant amount heat (figure 2, figure 4).

2. In each membrane of a welded bellows there is only one hole, therefore, the manufacturing process for making a bellows is simpler in comparison with the similar manufacturing process for making a cartridge consisting of plates with two holes (Fig. 1, Fig. 3).

3. The welded bellows is not a rigid structure. Its corrugations can move relative to each other. Therefore, the assembly of parts of the heat exchanger during its manufacturing process is simplified. The design of the cartridge, which is an integral part of the analogue, is such that it does not allow the plates to move relative to each other. Therefore, the manufacture of such a heat exchanger requires rather tight dimensional tolerances for its assembly.

Here is a list of drawings with a brief explanation of what is shown on each of them.

Figure 1 illustrates the device of the cartridge 5. The cartridge consists of the same plates 1. The cross sections of two such plates located to each other by the protrusions are marked with the number 2. The numbers 3 indicate welds along the contours of the two holes of the plates. The number 4 indicates welds along the outer contours of the plates.

Figure 2 explains the device of the welded heat exchanger "GEAShell". The heat exchanger consists of a casing 6, in which the cartridge is installed 5. Bold arrows indicate the movement of the medium outside the cartridge, and thin arrows show the movement of the medium inside the cartridge.

Figure 3 explains the device and the manufacturing procedure of the welded bellows 9. The bellows consists of the same membranes 7. Cross sections of two such membranes located to each other by protrusions are marked with a number

8. The number 3 indicates the welds along the contour of the membrane opening. The number 4 indicates welds along the outer contours of the membranes.

Figure 4 illustrates the structure of a bellows heat exchanger. The heat exchanger consists of a casing 6, in which a welded bellows 9 is installed. Bold arrows indicate the movement of the medium outside the bellows, and thin arrows show the movement of the medium inside the bellows.

Figure 5 is a photograph of a fabricated welded bellows with pipes attached to it. The bellows has ten corrugations.

For testing in accordance with figure 4 was made a bellows heat exchanger. The photograph of FIG. 5 shows for this heat exchanger a bellows with pipes attached to it. It consists of ten corrugations. The outer diameter of the bellows is 80 mm, the inner diameter of the hole is 6 mm, and the membrane wall thickness is 0.15 mm. During the test, water with a temperature of about 52 ° C was supplied inside the bellows for cooling. Cooling water with a temperature of about 13 ° C was supplied into the casing. Outside and inside the bellows, the same pressure was maintained at 0.5 bar. When working under these conditions, the heat exchanger proved to be quite effective, reducing the temperature of the cooled water by about 10 ° C.

Claims (1)

A welded plate heat exchanger, consisting of a casing and cassettes placed inside it, made of round membranes welded to each other along internal and external circuits, characterized in that the cassettes are made in the form of welded bellows, and the membranes have one hole that is located directly at the outer the contour of the membrane, with each subsequent bellows corrugation formed of two membranes located so that its inner hole is diametrically opposite to the hole of the previous corrugation.

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