JPS606480B2 - closed cooling tower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a closed type cooling tower that exhibits extremely excellent functionality and is easy to manufacture by configuring the cooling coil portion as a multilayer body of spiral coils.

A closed type cooling tower (also called a closed type evaporative cooling tower) is used to cool the fluid to be cooled without exposing it to the atmosphere. The fluid to be cooled is cooled in a closed manner by sprinkling cooling water and ventilating the outside air to transfer the heat retained in the fluid to the outside air through the cooling water.

The cooling coil section in conventional closed cooling towers has a serpentine shape (
It most commonly consisted of a survain tin coil.

In other words, the main body is a straight pipe, and a pend tube is connected (welded) to both ends of the straight pipe, or both ends are bent to form a meandering coil, and multiple meandering coils are connected with a header. It was usual to form the cooling coil section by doing so. However, this meandering coil is difficult to manufacture, has limited flexibility in designing for cooling loads, and has various problems in terms of functionality. The present invention provides a closed-type cooling tower that can be applied to any of the counter-current type, parallel-current type, or cross-flow type and is highly manufacturable. It is characterized in that it is formed into a multilayer body of substantially horizontal spiral coils.

In other words, when obtaining a counter-current or co-current closed type cooling tower, the cooling coil section is formed into a multilayer body of almost horizontal spiral coils, and the spiral coil section is formed into a multilayer body of spiral coils from the outer periphery toward the inner periphery. In the case of obtaining a cross-flow closed type cooling tower, the structure is such that the outside airflow is passed from below to above the multilayer body of spiral coils. Hereinafter, the present invention will be specifically explained according to each embodiment of the drawings.

FIG. 1 schematically shows a cooling coil section according to the present invention, and simulatively represents a state in which substantially horizontal spiral coils 1 to ln are stacked at appropriate intervals.

Each of the spiral coils 1 to ln has its inner ends 2 to 2n connected to each other by a header (not shown), and its outer ends 3 to 3n connected to each other by a header (not shown). Use in conjunction. Therefore, for example, in order to obtain a flow of the fluid to be cooled from the inside to the outside of each spiral coil 1 to ln, the fluid to be cooled is introduced into the header at the inner end 2 to 2n, and the fluid to be cooled is introduced into the header at the outer end 3 to 3n. The connection method is such that the fluid to be cooled is taken out from the outside, and the opposite connection method is used to obtain a flow of the fluid to be cooled from the outside to the inside.
FIG. 2 is a vertical cross-sectional view of a counter-current or co-current type closed cooling tower in which the substantially horizontal spiral coil multilayer body 4 shown in FIG. 1 is incorporated into the tower.

That is, in the cooling tower shown in FIG. 2, an outside air intake port 5 is provided on the outer periphery of a multilayered body 4 of spiral coils, and a water sprinkler 6 is provided on the upper part of this multilayered body 4. is made to flow across the multilayer body 4. In the case of forming an airflow that crosses the cooling coil section in this way, in the conventional case, a cross-flow type cooling tower is usually used, but in the case of the example of the present invention, due to its principle, a counter-current type or a parallel-flow type is used. cooling tower. In other words, when forming a flow of the fluid to be cooled from the inside of the spiral to the outside of the multilayer body 4 of the spiral coil, the fluid flows opposite to the direction of the airflow, resulting in a counterflow type, and flows from the outside of the spiral to the inside. When the flow of the fluid to be cooled is formed, it follows the direction of the air flow, resulting in a parallel flow type. Which method to adopt can be arbitrarily selected depending on the setting conditions, but depending on the case, it is possible to have a configuration that uses both methods. That is, as shown in FIG.
By dividing the header 6 at the inner end and the header 9 at the outer end into different levels, the direction of the flow of the cooled fluid inside the coil can be reversed as shown by the arrow. A flow of the fluid to be cooled towards the vortex and a flow of the fluid to be cooled from the outside to the inside of the vortex are obtained, resulting in a system that combines countercurrent and parallel flow. The other elements in the cooling tower shown in Fig. 2 are substantially the same as before, and 0 is a cooling water circulation pump;
．． 1 indicates an eliminator, and 12 indicates a lower water tank.
FIG. 3 is a vertical cross-sectional view of a cross-flow closed type cooling tower constructed by incorporating the spiral coil multilayer body 4 described in FIG. 1 into the tower.

When having such a cross-sectional shape, the conventional example usually uses a counter-flow type, but the example of the present invention uses a cross-flow type. That is, the cooling tower shown in FIG. 3 is provided with an outside air intake port 5 at the bottom of the tower body so as to obtain an air flow upward from the bottom of the multilayer body 4 of spiral coils, and a It is configured by installing a water sprinkler 6. As in the case of Fig. 2, 7 is a blower, 10 is a cooling water circulation pump,
11 indicates an eliminator, and 12 indicates a lower water tank.
In the case of the cooling tower shown in FIG.
3 has been installed. In the cooling tower of FIG. 3, the flow of the fluid to be cooled flows in a horizontal direction from the inside to the outside of the vortex and from the outside to the inside, whereas the flow of air is in a direction perpendicular to this.

Not only in this example of the present invention but also in the case of conventional examples, in a cross-flow closed type cooling tower, the temperature at the inlet and outlet sides of the fluid to be cooled, the wet bulb temperature of the outside air taken in, and the amount of outside air ventilation Heat exchange efficiency is generally lower than in countercurrent systems due to the wet bulb temperature of the discharged air and other factors. This decrease in heat exchange efficiency can be effectively avoided by forming the multilayer body 4 of spiral coils in the structure shown in FIG. 4 in the cooling tower of the present invention. As shown in the figure, the header 8 at the inner end and the header 9 at the outer end of each spiral coil 1 to ln are divided into different levels, and the flow direction of the fluid to be cooled is reversed as shown by the arrow. When viewed in longitudinal section, by passing water up and down or up and down in a zigzag pattern, it is possible to approach a countercurrent type and improve heat exchange efficiency. Figure 5 shows an embodiment with multiple spiral coils. In addition to forming a multilayer body with one spiral coil as shown in Fig. 1, multiple spiral coils 1, 1', r, etc. with different overturn diameters are used as shown in Fig. 5. ... ln) may be used to form a multilayer body using multiple (double in Figure 5) spiral coils. Figures 6 and 7 show partial cross-sections of the multilayer body of spiral coils. Then, each spiral coil is arranged in a grid pattern (6th
(Fig. 7) or staggered arrangement (Fig. 7).

In this way, the multiple winding structure and the spiral coils arranged in a grid pattern or staggered pattern can be adopted in both the cases shown in Fig. 2 and Fig. 3, and can be adopted as appropriate according to the manufacturing conditions and design conditions of the tower. It is possible.

As described above, since the hermetic cooling tower according to the present invention has a cooling coil part made up of spiral coils, various effects as described in detail in the main text are exhibited, but the cooling coil part is made up of conventional meandering coils. The advantages of this method compared to other cases are as follows. '1} The coil element is easy to manufacture. In the case of the present invention, a spiral coil element can be easily manufactured by passing a straight pipe through a lo-hoo bender (the roller spacing is changed depending on the length of the straight pipe passing through), and a conventional meandering coil. In the case of,
Even if a meandering coil is made from a single straight tube, the bending process is complicated and inaccurate, and production efficiency is further reduced when a pend tube is welded to the end. {2}
It is easy to adjust the cooling tower capacity.

That is, in the case of the present invention, the capacity can be easily adjusted by changing the number of stacked spiral coils. especially,
In the case of Figure 2, the number of channels for the fluid to be cooled and the area through which the air passes are both proportional to the number of stacked spiral coils, so
In cases where the temperature conditions are almost constant, such as in closed cooling towers for air conditioning, the fluid conditions in the coil section remain unchanged even if the capacity changes, so there is no need to perform design calculations again for any capacity, which is extremely convenient. More flexibility. Such an effect is completely difficult to obtain in the conventional example. '3' The number of types of related parts can be reduced.

In other words, in the case of the present invention, the capacity can be changed by changing the number of stacked coils without changing the size of the spiral coils, so the capacity of the lower water tank or water sprinkler can be increased or decreased without changing the size. Cooling towers of various capacities can be constructed even if most of the parts are single or of low quality, and production costs can be significantly reduced by mass production of single or low-quality units.

[Brief explanation of the drawing]

FIG. 1 is a simulated perspective view of a cooling coil section according to the present invention;
Fig. 2 is a longitudinal sectional view of the cooling tower of the present invention, Fig. 3 is a longitudinal sectional view of the cooling tower of the invention, Fig. 4 is a longitudinal sectional view showing one embodiment of the cooling coil portion, and Fig. 5 is a longitudinal sectional view of the spiral coil. FIG. 6 is a plan view showing one embodiment, FIG. 6 is a partial sectional view showing an arrangement of the spiral coils, and FIG. 7 is a partial sectional view showing another arrangement of the spiral coils. 1-ln... Spiral coil, 4... Multilayer body of spiral coil, 5... Outside air intake, 6...
...Water sprinkler, 7...Blower, 8,9...
・Header, 11...Eliminator, 13・
...Space blocking material. Figure 1 Figure 2 Figure 3 Figure 2 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Scope of Claims] 1. The cooling coil section in a closed cooling tower is formed into a multi-layer body of substantially horizontal spiral coils, and the intake outside air flow is passed from the outer circumference to the inner circumference of the multi-layer body of spiral coils. A closed cooling tower designed to 2 A multilayer body of spiral coils is a patent that is a multilayer body formed by connecting spiral coils so that a flow of the fluid to be cooled from the inside of the spiral to the outside and a flow of the fluid to be cooled from the outside of the spiral to the inside are obtained. A closed cooling tower according to claim 1. 3. The closed type cooling tower according to claim 1 or 2, wherein the multilayer body of spiral coils has a cross-section of the coils in a checkerboard arrangement or a staggered arrangement in its longitudinal section. 4
Claims 1 and 2, wherein the spiral coil is a multiple spiral coil in which a plurality of spiral coils having different spiral diameters are multiplexed.
The closed cooling tower according to item 3 or item 3. 5. A closed type cooling tower in which the cooling coil portion of the closed type cooling tower is formed into a multi-layered body of substantially horizontal spiral coils, and the intake airflow is passed from below to above the multi-layered body of spiral coils. 6. A multilayer body of spiral coils is a patent in which spiral coils are connected so that a flow of the fluid to be cooled from the inside of the spiral to the outside and a flow of the fluid to be cooled from the outside of the spiral to the inside are obtained. A closed cooling tower according to claim 5. 7. The closed type cooling tower according to claim 5 or 6, wherein the multilayer body of spiral coils has a cross-section of the coils in a checkerboard arrangement or a staggered arrangement in its longitudinal section. 8
Claims 5 and 6, wherein the spiral coil is a multiple spiral coil in which a plurality of spiral coils having different spiral diameters are multiplexed.
The closed cooling tower according to paragraph 7 or paragraph 7.