JPH0567874B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heat exchanger using flexible plastic tubes as heat exchanger tubes. The present invention relates to a shell-and-tube heat exchanger that performs heat exchange by circulating a first fluid in the heat exchanger tubes and a second fluid in the inner space of the casing.

[Conventional technology]

Conventionally, as a multi-tube heat exchanger in which a bundle of plastic tube heat transfer tubes is inserted into a casing, multiple tubes made of fluororesin are bundled together and A bundle of tubes whose terminal parts are tied together and whose open ends are formed into a honeycomb shape is inserted into a metal cylinder (casing), and the first fluid is passed through each tube into the casing. Heat exchangers that exchange heat by circulating a second fluid are known. The heat transfer tubes of this heat exchanger are made of fluorine-based resin, which has excellent corrosion resistance, non-adhesiveness, and non-contamination. Widely used in the field.

In such heat exchangers, a large number of thin and narrow plastic tubes are used as heat transfer tubes. Unlike metal tubes, these plastic tubes are highly flexible, so it is difficult to maintain the tubes in line at appropriate intervals. The tube is inserted into and supported by a plurality of support plates arranged at short intervals in the longitudinal direction of the tube.

[Problem to be solved by the invention]

By the way, in the above heat exchanger, since the plurality of support plates are installed at right angles to the flow direction of the fluid and at short intervals, the fluid flowing inside the inner space of the casing is controlled by each support plate. Although fluid flow holes are provided, there is a problem that the flow resistance is large and the pressure loss is large, so it cannot be applied when it is necessary to flow a highly viscous liquid to the casing side.

In view of these problems in the prior art, the present invention provides a multi-tubular plastic tube heat exchanger that has a small fluid pressure loss within the casing and is suitable for, for example, flowing high viscosity liquid to the casing side. Its purpose is to provide.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a plastic tube bundle in which sleeves are fitted around both ends of a plurality of plastic tubes arranged in parallel to each other, and the plastic tubes are integrally bonded to form a honeycomb-like airtight joint. At least a middle portion of the tube is disposed in the inner cavity of the casing, and heat exchange is performed by circulating the first fluid in the inner cavity of the casing while circulating the first fluid in the inner cavity of the casing. In the exchanger, the plurality of plastic tubes are flexible;
They are inserted and supported by two support plates and folded back in a substantially U-shape through one of the support plates at the midway point, and the other side is provided at the end of each parallel portion extending from this folded portion to both ends. The support plate is stretched between the support plate and the one support plate while maintaining a parallel and spaced relationship due to the load applied to the folded portion.

[Effect]

According to this invention, a plurality of flexible plastic tubes are arranged in parallel, and sleeves are fitted around both ends of the tubes, and the tubes are joined together to form a honeycomb-like airtight joint. The tube bundle is folded back into a substantially U-shape, and support plates are inserted through the folded portion and the ends of each parallel portion from the folded portion to both ends of the tube bundle, and the tube bundle is supported by these two support plates. has been done. Then, a load is applied to this folded portion in the direction opposite to both ends of the tube bundle, and as a result, each plastic tube, which is easy to bend, is supported in a stretched state in the longitudinal direction in the parallel portion. As a result, they are arranged in a parallel and spaced relationship with each other. For this reason, there is no need to insert support plates into the bundle of plastic tubes at short intervals to support each plastic tube apart from the conventional method, and when the fluid on the casing side flows parallel to the plastic tubes, The number of support plates that cause resistance or stagnation can be significantly reduced.

Therefore, the pressure loss of the fluid flowing through the inner space of the casing is reduced, which is particularly advantageous when, for example, a highly viscous fluid such as oil is caused to flow through the casing.

〔Example〕

FIG. 1 is a partially vertical front view showing one embodiment of the plastic tube heat exchanger according to the present invention;
The figure is also a partially longitudinal side view.

In the illustrated plastic tube heat exchanger 1, the plastic tube bundle 10 is made up of a plurality of flexible plastic tubes 11 made of, for example, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin, and has four feet at both ends thereof. A sleeve 12 made of ethylene chloride resin is fitted over the outside, and they are bonded together by means such as heat fusion to form a honeycomb-like airtight joint at the end, and the sleeve 12 is folded back at the midway point to form an airtight joint. Inner cavity 2 of casing 20 in a U-shaped state
1, and the sleeve 12 at both ends connects to the terminal joint 2 at the flange portion 22 of the casing 20.
It is attached by 3. Further, support plates 30 and 40 are provided at the folded part 13 of the plastic tube bundle 10 and at the upper end of each parallel part 14 extending from the folded part 13 to both ends, and each plastic tube 11 has a large number of through holes. are provided at approximately equal intervals from each other,
40, and is supported under tension so that a parallel and spaced relationship is maintained between these support plates 30 and 40.

In the embodiment, each plastic tube 11
Due to the weight of the support plate 30 that engages with the folded portion 13, tension is applied in the longitudinal direction in the parallel portion 14 between the support plates 30 and 40, thereby maintaining a parallel-separated relationship. However, in addition to this, for example, by tensioning a spring between the lower surface of the lower support plate 30 and the bottom surface of the casing 20, each plastic tube 11
The structure may be such that tension is applied to each plastic tube 11, and the manner in which tension is applied to each plastic tube 11 can be changed as appropriate.

In this case, the lower surface of the lower support plate 30 is provided with an arc-shaped protrusion 31 having a larger curvature than the minimum bending radius of the plastic tube 11, and each plastic tube 11 is folded back using this protrusion 31 as a fulcrum. , it will never collapse. In addition,
In the embodiment, the plastic tubes 11 converged at the end portion are inserted one by one into the through holes on one side of the upper support plate 40, and are divided into three rows here, and the plastic tubes 11 are inserted into the lower support plate 30 as they are. are inserted from one side and lined up in a row at the protrusion 31,
Further, they are divided into three rows again at the through hole on the opposite side, and are inserted into the through hole on the other side of the upper support plate 40, and are converged at the end portion.

In addition, the upper support plate 40 is filled with adhesive or the like in the gaps between the through holes, and the plastic tube bundle 10 is filled with adhesive or the like.
The lower support plate 3
Even if the parallel portion 14 of each plastic tube 11 is subjected to tension due to the weight of 0, no load is directly applied to both ends of the plastic tube bundle 10, so that the hermetic joint is protected.

Plastic tube heat exchanger 1 having such a configuration
According to the above, between the support plate 30 and the support plate 40, a plastic tube 1 is used to conduct the fluid on the casing 20 side.
Since there is no support plate that causes flow resistance when flowing parallel to the casing 20 and the plastic tubes 11 are arranged in a parallel and spaced relationship between the support plates 30 and 40, the casing 20 The fluid entering from one outlet 24 does not experience a large pressure loss as in the conventional case while passing through the inner space 21 and exiting from the other outlet 24. Therefore, the casing 20
This is a suitable heat exchanger when a highly viscous liquid is distributed as the side fluid. Furthermore, since the plastic tube bundle 10 in the embodiment is folded back into a substantially U-shape, there is an advantage that the tension at the folded portion 13 can be easily adjusted.

〔Effect of the invention〕

As explained above, according to the present invention, sleeves are fitted onto both end portions of a plurality of flexible plastic tubes, and these are integrally bonded to form a honeycomb-like airtight joint. In a plastic tube heat exchanger in which the middle portion of a tube bundle is disposed in the inner space of a casing and heat exchange is performed through the tube wall of the plastic tube, each plastic tube is folded back into a substantially U-shape. The tube is inserted through and supported by two support plates provided at an interval, and a load is applied to this folded portion in a direction opposite to both ends of the substantially U-shaped tube bundle. As a result, each flexible plastic tube is supported in a stretched state in the longitudinal direction between its support plates, so that it can be spaced parallel to each other with only two support plates, without inserting a support plate in the middle. Arrange while retaining. For this reason, there is no need to insert a large number of support plates into the plastic tube bundle at short intervals as in the past, and the pressure loss when the fluid on the casing side flows parallel to the plastic tubes is significantly reduced. This heat exchanger is suitable for applications where highly viscous fluids flow or where pressure loss is a problem.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and various changes can be made within the technical idea of the present invention, such as changing the arrangement of the tubes and the shape of the casing.

[Brief explanation of drawings]

FIG. 1 is a partially vertical front view showing one embodiment of the plastic tube heat exchanger according to the present invention;
The figure is also a partially longitudinal side view. 10... Plastic tube bundle, 11... Plastic tube, 12... Sleeve, 20...
...Casing, 21...Inner cavity, 23...Terminal joint, 24...Outlet/outlet, 30, 40...Support plate,
31... Protrusion.

Claims (1)

[Claims] 1. Sleeves are fitted around both end portions of a plurality of plastic tubes that are parallel to each other, and at least the middle portion of a bundle of plastic tubes that is integrally bonded to form a honeycomb-like airtight joint is inserted into the inner cavity of the casing. In a plastic tube heat exchanger that performs heat exchange by circulating a first fluid in each plastic tube and circulating a second fluid in the inner space of the casing, the plurality of plastic tubes is flexible, and is inserted and supported by two supporting plates, and is folded back in a substantially U-shape through one of the supporting plates at the midway point, and each parallel portion from this folded portion to both ends. A plastic tube heat exchanger characterized in that the other supporting plate provided at the end portion and the one supporting plate are stretched so as to maintain a parallel-separated relationship due to the load applied to the folded portion. vessel.