JPH0531409Y2 - - 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.

[The problem that the idea 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 to solve the problem]

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. plastic tubes are wound in opposite directions from the center of the frame toward the outside while intersecting each other at the curvature changing portions, and the curvature changing portions of these intersecting plastic tubes are supported substantially parallel to each other. Configure a tube heat exchanger.

[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, and the curvature changing portions of these intersecting plastic tubes are supported substantially parallel to each other, In the case of non-intersecting parts, the fluid inlet side and the outlet side are located alternately, which reduces the temperature difference between the center and the outer part of the spiral tube. Uniform heat exchange is possible compared to a case where the tube is simply wound into a spiral disk shape that gradually decreases or expands in diameter from one end of the tube to the other.

Furthermore, since the plastic tubes intersect at various places in the curvature change parts, turbulence tends to occur on the outside of the tubes when agitating.Moreover, the curvature change parts of the plastic tubes that intersect with each other are supported approximately parallel to each other by the frame. Since there is almost no contact between the tubes at the intersection, or it is possible to prevent the tubes from coming into contact with each other at the intersection, a surface in contact with the liquid can be effectively secured, and therefore the heat exchange efficiency can be greatly improved.

〔Example〕

FIG. 1 is a perspective view showing an embodiment of the plastic tube heat exchanger according to this invention. Bundle up each plastic tube 2 terminals,
A bundle of plastic tubes 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 a multiple loop portion 41 is 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.
Each plastic plate 51 has six tube insertion holes 53 provided at predetermined intervals in a staggered manner on both sides of the engaging portion 52. Tube insertion hole 5
One through hole 54 for a metal rod 6, which will be described later, is provided on the end side of each rod 3.

Then, the plastic tube bundle 4 is moved from its central portion to the plastic plates 51 in opposite directions starting from the vicinity of the engaging portion 52 of the frame 5.
The tubes are sequentially inserted into tube insertion holes 53 provided in the tube. Here, each half of the plastic tube bundle 4 is located between the upper half 51a and 51a of the two plastic plates 51 of the frame 5, and the lower half 51 of the plastic tube bundle 4.
The curvature changing portions 4 of the intersecting plastic tube bundles 4 are arranged substantially parallel to each other, so that the curvature changing portions 4 of the plastic tube bundles 4 intersecting each other are arranged substantially parallel to each other.
Both ends of the plastic plate 51 are supported by the insertion holes 53 located on one side with respect to the longitudinal center line of the two upper halves 51a, 51a, and intersect with the curvature change portion 42a. Both ends of the other curvature change portion 42b are inserted through the plastic plates 51 so as to be supported by the insertion holes 53 located on the other side of the upper halves 51a, 51a, and the upper halves 51a and the lower halves of the plastic plates 51 are It is inserted between the portion 51b at a different position relative to the center line of the insertion hole 53, and is wound in the direction in which the spiral spreads. Further, both end portions of the plastic tube bundle 4 rise up when exiting the tube insertion holes 53 on the end side of the upper half portions 51a, 51a of each plastic plate 51, forming parallel rising portions 43. .

Further, 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 41 of the plastic tube bundle 4. Further, both end portions of the metal rod 6 are connected to the upper half portions 51a, 51 of each plastic plate 51, similar to the plastic tube bundle 4.
It rises at the point where it exits a, and is parallel to the rising part 43 of the plastic tube bundle 4.

The thus formed plastic tube heat exchanger 1 consists of the non-intersecting parts of the plastic tube bundle 4 (the upper half 5 of one plastic plate 51).
1a and the lower half 51b of the other plastic plate 51
), the inlet and outlet sides of the fluid are located alternately during use, so there is little temperature difference between the center and the outer part of the vortex, which results in uniform heat exchange. becomes possible.

Further, since the spiral curvature changing portion 42 has an intersection portion 44, turbulence is likely to occur in the thermal convection of the liquid in the liquid tank.
Since the plastic tube bundles 4 are supported substantially parallel to each other, the plastic tube bundles 4 do not come into contact with each other at the intersection 44, or can even be completely prevented from coming into contact with each other, thereby effectively ensuring a wetted surface. heat exchange efficiency is greatly improved.

In the embodiment, an example was explained in which a plastic tube bundle 4 was used as the heat transfer tube, 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 44 is not necessarily part of 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 insertion holes 53 of each plastic plate 51 do not necessarily have to be arranged alternately, and even if a frame 7 in which two insertion holes 71 are arranged alternately as shown in FIG. bundle 4
The curvature changing portions 42 of can be supported substantially in parallel. Note that the metal rods 6 may be omitted depending on the usage conditions, but in this case, the rising parts of the plastic tube are located almost at both ends of the frame, so when the plastic tube is suspended, a biased force may be applied to the plastic tube. It can be installed without any trouble.

[Effects of the invention] 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 the curvature change portion of the spiral is Because the plastic tubes are supported so that they intersect at each other and the curvature change parts that intersect are approximately parallel to each other, turbulent flow is likely to occur on the outside of the plastic tube, and there is almost no contact between the tubes at the intersection, resulting in poor heat transfer. Since the area is effectively secured, as a result, the heat exchange efficiency is improved compared to the conventional example in which the plastic tube is simply wound into a spiral. Since the inlet side portions and the outlet side portions are alternately located, the temperature difference in each portion of the volute is reduced, which also has the effect of making the heat exchange uniform over the entire surface of the volute disk.

Note that this invention is not limited to the above embodiments, and various modifications may be made within the technical concept of this invention, such as changing the material and shape of the plastic tube, sleeve, and frame, or changing the number of turns of the plastic tube. Changes are of course possible.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the plastic tube heat exchanger according to this invention, and Fig. 2 is a perspective 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 embodiment, and FIG. 3 is a plan view of a frame used in another embodiment of the invention. 2... Plastic tube, 3... Sleeve, 4... Plastic tube bundle, 41... Loop part, 42... Curvature change part, 44... Intersection part, 5, 7... Frame, 51... Plastic plate, 53, 54, 71...Through hole, 6...Metal rod.

Claims (1)

[Scope of utility model registration request] 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
The plastic tubes are wound in opposite directions from the center of the frame toward the outside while intersecting each other at the curvature changing portions, and the curvature changing portions of these intersecting plastic tubes are supported substantially parallel to each other. Plastic tube heat exchanger.