JPH0531407Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a heat exchanger that uses a plastic tube as a heat transfer tube. Relating to a supported plastic tube heat exchanger.

[Conventional technology]

Conventionally, this type of heat exchanger used by being immersed in a plating tank, a pickling tank, etc., has been disclosed, for example, in Japanese Patent Publication No. 58-9917, Japanese Patent Application Publication No. 60-2894, and Japanese Patent Application Publication No. 59-1989.
There are heat exchangers shown in each publication of No. 97500, and these heat exchangers are made by moving a plastic tube from the outside in a direction that gradually reduces the diameter of each support plate against a frame consisting of two support plates intersecting at right angles. It has a structure in which it is wound while being sequentially inserted into the insertion hole, and the whole is held in a disk shape.

[Problem that the invention attempts to solve]

However, in the above conventional plastic tube heat exchanger, the plastic tube is wound to form a concentric vortex, so the outer edge of the vortex near the inlet and outlet of one of the fluids in the plastic tube and the other side of the vortex of the fluid A large temperature gradient occurs between the central portion near the inlet and the inlet, and this poses a problem in that uniform heat exchange is not carried out, especially when stirring within the liquid tank is restricted. In addition, since the plastic tubes are located on the same plane and wound in an aligned manner, the flow of fluid in the direction perpendicular to the disk-shaped plastic tube becomes laminar, resulting in poor heat exchange efficiency. There is also a drawback.

In view of these problems of the prior art, the object of this invention is to provide a plastic tube heat exchanger that is capable of uniform heat exchange and has good heat exchange efficiency.

[Means for solving problems]

In order to solve the above-mentioned problems of the prior art, this invention provides a plastic tube heat exchanger in which at least one plastic tube is wound in a disc shape through a frame and supported by the frame. A plastic tube heat exchanger is constructed by winding the plastic tubes in opposite directions from the center of the frame toward the outside while intersecting each other at the curvature change portions.

In this configuration, the heat transfer tube can be composed of one or more plastic tubes, and when multiple plastic tubes are used, they are bundled and the end portions are integrally fused with a plastic sleeve to form a honeycomb. A sealed structure like this is advantageous because it not only simplifies terminal connection but also greatly increases the heat transfer area.

[Effect]

According to this invention, as described above, in a plastic tube heat exchanger in which at least one plastic tube as a heat transfer tube is wound in a disk shape through a frame and supported by the frame, the at least one plastic tube is are wound in opposite directions from the center of the frame toward the outside while intersecting each other at the curvature changing portions, so in the non-intersecting portions, the fluid inlet side portion and the outlet side portion alternate. As a result, the temperature difference between the center and outer parts of the spiral tube is reduced, so the diameter of the tube is gradually reduced or expanded from one end to the other, as in the conventional method. This allows for more uniform heat exchange compared to the one that is simply wound into a spiral disk shape.

Furthermore, since the plastic tubes intersect at various points in the curvature change section, turbulent flow tends to occur outside the tubes when stirring, thereby improving heat exchange efficiency.

〔Example〕

FIG. 1 is a front view showing an embodiment of the plastic tube heat exchanger according to this invention. Bundle up each plastic tube 2 terminals,
A plastic tube bundle 4 has a sealed structure in which individual tubes 2 are integrally fused to a sleeve 3 made of tetrafluoroethylene resin and both end portions are formed into a honeycomb shape, and multiple loop portions 4a are formed in the middle portion. It is supported by the frame 5 in this state.

Here, the frame 5 consists of two plates 5 made of tetrafluoroethylene resin, as shown in detail in FIG.
1 are intersected at right angles and engaged with each other, and each plastic plate 51 is provided with six tube insertion holes 53 at predetermined intervals on both sides of the engaging portion 52. One through hole 54 for a metal rod 6, which will be described later, is provided on the end side of the rod 53.

Then, the plastic tube bundle 4 is inserted into the tube insertion hole 53 provided in the plastic plate 51 from near the engaging part 52 of the frame 5 in opposite directions to each other from the engaging part 52 side.
The upper half and lower half of the two plastic plates 51 are wound in the direction in which the spiral spreads while intersecting with each other, and both ends of the plastic plates 51 are inserted into the tube insertion holes on the end side of the upper half of each plastic plate 51. The structure is such that it rises at the point where it exits 53, forming parallel rising parts 4b.

Furthermore, in the embodiment, a metal rod 6 covered with plastic is inserted into the plastic plate 51 in parallel with the loop portion 4a and serves as a reinforcement and a weight on the outside of the outermost loop portion 4a of the plastic tube bundle 4. Further, both end portions of the metal rod 6 stand up when exiting the upper half of each plastic tube plate 51, similar to the plastic tube bundle 4, and are parallel to the rising portion 4b of the plastic tube bundle 4. .

In the plastic tube heat exchanger 1 thus formed, in the non-intersecting portion of the plastic tube bundle 4 (between the upper half of one plastic plate 51 and the lower half of the other plastic plate 51), the plastic tube heat exchanger 1 is free of fluid during use. Since the inlet and outlet portions of the vortex are alternately located, there is little temperature difference between the center and the outer portion of the vortex, which enables uniform heat exchange.

Further, since the curvature change portion of the spiral has the intersection portion 4c, turbulence is likely to occur when the inside of the liquid tank is stirred, and heat exchange efficiency is also improved.

In addition, in the embodiment, an example in which a plastic tube bundle 4 is used as a heat transfer tube has been described, but of course, a single tube may be wound in such a shape, and furthermore, the plastic tube bundle 4 may be wound at an intersection. Part 4c is not necessarily frame 5
It is not necessary to position them only on the upper and lower sides; for example, they can be changed as appropriate, such as intersecting at various locations on the upper, lower, left, and right sides of the frame 5. Furthermore, the metal rod 6 may be omitted depending on the usage conditions. In this case, since the rising portions of the plastic tube are located at substantially both ends of the frame, no biased force is applied to the plastic tube when it is hung, and the plastic tube can be easily attached.

[Effect of idea]

As explained above, according to this invention, at least one plastic tube is wound in a spiral disk shape in opposite directions from the center of the frame outward, and intersects at the curvature change part of the spiral. As a result, turbulent flow is likely to occur on the outside of the plastic tube, and as a result, the heat exchange efficiency is improved compared to the conventional example in which the plastic tube is simply wound in a spiral. In this case, since the inlet and outlet sides of the tube are located alternately, the temperature difference in each part of the volute is small, which also has the effect of making heat exchange uniform over the entire surface of the volute disk. .

It should be noted that this invention is not limited to the above-mentioned embodiments, and it is of course possible to make various changes within the technical concept of this invention, such as changing the materials and shapes of the plastic tube, sleeve, and frame.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the plastic tube heat exchanger according to this invention, and Fig. 2 is a front view showing an embodiment of the plastic tube heat exchanger according to this invention.
FIG. 3 is a perspective view of a frame used in the illustrated embodiment. 2...Plastic tube, 3...Sleeve, 4...Plastic tube bundle, 4a...Loop portion, 4c...Intersection portion, 5...Frame, 5
1...Plastic plate, 53, 54...Insertion hole,
6...Metal rod.

Claims (1)

[Claims for Utility Model Registration] (1) In a plastic tube heat exchanger in which at least one plastic tube is wound in a disk shape through a frame and supported by the frame, the at least one plastic tube is A plastic tube heat exchanger characterized in that the plastic tube heat exchanger is wound in opposite directions from the center to the outside while intersecting each other at the curvature changing portions. (2) In the plastic tube heat exchanger described in claim 1 of the utility model registration claim, the plastic tubes are composed of a plurality of plastic tubes, the plurality of plastic tubes are bundled, and their terminal parts are integrally fused with the plastic sleeve. 1. A plastic tube heat exchanger characterized in that the plastic tubes are joined together to form a honeycomb-like joint.