JPH0449516Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial Application Field> This invention relates to a cooling tower that has the function of sterilizing bacteria in spray water.

<Problems with the prior art> In this type of cooling tower, the technology related to improving the shape of the heat exchanger, the flow rate control of piping and the spray water, and the spraying device related to improving the cooling efficiency of the spray water has been developed. Although advances have been made since the advent of cooling towers,
The type that sterilizes spray water in a cooling tower uses chemicals.

Recently, from the viewpoint of public health, there has been a demand in the technical field of cooling towers for cooling towers that have a function of sterilizing sprayed water.

In order to improve the above-mentioned problems, this invention uses a flowing water type ultraviolet sterilizer to sterilize the sprayed water in the riser piping system before spraying it onto the closed heat exchanger. The purpose is to provide the market with

<Means for solving the problem> This idea uses this heat to cool the warmed circulating cooling water that is supplied from the load section into the closed heat exchanger and flows through the closed heat exchanger without contact. Sprayed water is sprinkled on the exchanger, allowed to flow down on the surface of the heat exchanger, and once collected in a lower water tank, is pumped up from the lower water tank via a riser pipe and onto the heat exchanger again using a water pump, and is circulated and distributed again. In a closed type cooling tower in which cooling water is repeatedly cooled in a non-contact manner and this cold water is sent to the load section for reuse, a flowing water type ultraviolet sterilizer for sterilizing the sprayed water is provided in the riser piping system. It is a closed type cooling tower with certain characteristics.

<Operations and Effects> The functions and effects of this device configured as described above will be explained below.

In this cooling tower, spray water is sprayed onto the heat exchanger in order to cool the warmed circulating cooling water that is supplied from the load section into the closed heat exchanger and flows through the closed heat exchanger without contact. After flowing down on the surface of the heat exchanger and once collected in a lower water tank, it is pumped up from the lower water tank via a rising pipe onto the heat exchanger using a pump and circulated again to cool the circulating cooling water repeatedly in a non-contact manner. This circulating cooling water is sent to the load section as cold water and reused.

In particular, in the cooling tower of this invention, when the water sprayed on the closed heat exchanger comes into direct contact with the outside air in countercurrent or crossflow, if bacteria are sucked into the cooling tower together with the outside air, When the sprayed water flows into the lower water tank and is reused after passing through the rising piping system driven by the water pump, the sprayed water is sterilized by the action of the flowing water type ultraviolet sterilizer while passing through this rising piping system, and the sprayed water is The bacteria are killed by the sterilizing power of the ultraviolet rays, and the proliferation of sterilizers is suppressed. Since the sprayed water after the sterilization treatment is sprayed onto the closed heat exchanger again, the generation of contaminants on the surface of the heat exchanger can be suppressed.

In addition, part of the spray water to the ultraviolet sterilizer can be supplied by using the water pump for spraying the spray water onto the heat exchanger, which reduces the structure and number of parts. The head loss caused by the passage of the sprayed water can also be practically ignored.

Since a running water type external radiation sterilization device is provided in the rising piping system, the installation direction of this ultraviolet sterilization device is not limited, and even if it is oriented horizontally or perpendicularly to the cooling tower outside air intake and the outer panel, Spray water can be passed through this ultraviolet sterilizer.

<Example> Next, a typical example of this invention will be described based on the drawings.

<First Embodiment> In FIG. 1, A indicates the entire cross-flow closed type cooling tower, and an upper part, which is a type of water sprinkler, is installed above the closed type heat exchanger 11 filled in the main body 10. A water tank 12 is installed in the main body 10, and the upper water tank 12 is hermetically sealed with a lid 13 as required.

The invention is the same even if the water sprinkling device is constructed by providing a horizontally arranged water sprinkling pipe with a large number of downward water sprinkling holes instead of the upper water tank 12.

A drop-in water tank 14, which is a type of lower water tank for storing spray water sprayed from the upper water tank 12 to the heat exchanger 11, is provided at the lower part of the main body 10, and extends horizontally from the drop-in water tank 14. The upper end of the spray water riser pipe 16 connected to the horizontal draw pipe 15 via the water pump P is connected to the upper water tank 12, forming a spray water riser piping system, that is, a spray water circulation system.

The structure described above is the same as that of a known closed cooling tower.

In this example of the invention, a bypass pipe 17 branched from the riser pipe 16 is further provided with an internally illuminated or externally illuminated running water type ultraviolet sterilizer 18. In this case, the internal illumination type is a rod-shaped ultraviolet germicidal lamp19.
is piped inside a concentric short cylindrical pipe 17a, and the spray flowing inside the bypass pipe 17 is sterilized from the inside by this sterilizing lamp 19 (see Fig. 2).
In addition, the externally illuminated type means that the short tube 17a itself is made of an ultraviolet-transparent material, such as quartz glass.
A rod-shaped ultraviolet sterilizing lamp 19 is installed on the outer circumferential surface of the tube 7a in parallel with the short cylindrical pipe 17a, and the spray water flowing through the bypass pipe 17 is sterilized from the outside by the sterilizing lamp 19 (Fig. 3). reference). In addition,
The short cylindrical pipe 17a is detachably connected to the bypass pipe 17.

Reference numerals 20 and 21 indicate first and second spray water flow rate regulating valves provided in the bypass pipe 17 above and downstream of the ultraviolet sterilizer 18, and 22 indicates the ultraviolet sterilizer 1.
8 is a third spray water flow rate adjustment valve provided in a part of the riser pipe 16 that is parallel to the riser pipe 16. A spray water bypass circuit is formed in which a part of the spray water is guided to the ultraviolet sterilizer 18 and joined together again.

<Second Embodiment> This is shown in Fig. 4, in which the internally illuminated water jet type ultraviolet sterilizer shown in Fig. 2 in the description of the first embodiment is replaced with an ultraviolet sterilizer 18a with a self-cleaning device. Other than that, the same reference numerals as in the first embodiment are as follows.
They have the same structure and function.

The ultraviolet sterilizer 18a with the self-cleaning device
is structured as follows.

In FIG. 4, an outer cylinder 23 is arranged concentrically surrounding the outside of a rod-shaped ultraviolet germicidal lamp 19.
A brush body 24 surrounding the rod-shaped ultraviolet germicidal lamp 19 is arranged over the entire length of the germicidal lamp 19 in a shape that rotates at the flow rate of the sprayed water flowing through the bypass pipe 17. The illustrated brush body 23 has a spiral shape, and an axial impeller 25 that is rotated by the flow of sprayed water is integrally installed at one end of the brush body 24 near the upstream side of the bypass pipe 17, if necessary. is installed on.

The brush body 24 is not limited to a spiral shape, but may be two rod-shaped brushes rotating around the periphery of the germicidal lamp 19a.

Spray water supply port 26 provided at one end of this outer cylinder 23
The primary side of the bypass pipe 17 is connected to the secondary side of the bypass pipe 17, and the spray water outlet 27 provided at the other end is connected to the secondary side of the bypass pipe 17, and the ultraviolet sterilizer 18a is interposed in the bypass pipe 17.

<Effect of the embodiment> The operation of the above embodiment will now be explained.

An upper water tank 12 is provided to cool the warmed circulating cooling water that is supplied from a load section (for example, a refrigerator) into the closed heat exchanger and flows through the closed heat exchanger in a non-contact manner.
The spray water is sprinkled onto the closed heat exchanger 11 from
While flowing down the surface of this heat exchanger 11, the warmed circulating cooling water flowing inside the closed heat exchanger is cooled without contact, and its temperature rises, and when it comes into contact with the outside air, it is affected by the latent heat of vaporization and is slightly heated. After being temporarily stored in the dropping water tank 14 in a state where the temperature is lowered, the water is pumped up by the pump P, and is sprayed again from the upper water tank 12 for circulation use. The circulating cooling water cooled in this manner is again supplied to the load section and reused.

On the other hand, a part of the sprayed water passes through the bypass pipe 17 and is led to the ultraviolet sterilizer 18 (=18a) where it is sterilized, and then passes through the bypass pipe 17 to the riser pipe 16.
It joins with the remaining sprayed water rising through the water tank 12 and is supplied into the upper water tank 12.

At this time, the amount of sprayed water to be sterilized is adjusted and changed by the sprayed water flow regulating valves 20, 21, and 22.

In the second embodiment, the brush body 24 to the axial impeller 25 are rotated on the circumferential surface of the germicidal lamp 19 due to the rotational force caused by the flow rate of the sprayed water flowing through the bypass pipe 17, and the sterilization is carried out. The foreign substances adhering to the surrounding surface of the lamp 19 are captured and cleaned.

Cleaning the ultraviolet sterilizer 18 (=18a),
When repairing, the first and second spray water flow rate regulating valves 20 and 21 provided in the bypass pipe 17 are completely closed, and a part of the spray water is not guided to the bypass pipe 17, but the third spray water flow rate is The adjustment valve 23 is fully opened, all of the sprayed water is pumped up through the riser pipe to the upper water tank 12, and the ultraviolet sterilizer 18 (=18a) is repaired and cleaned while the cooling tower continues to operate.

<Effects specific to the embodiment> The embodiment described above exhibits the effects of this invention, and
The unique effects are as follows.

By providing the first and second spray water flow rate regulating valves 20 and 21 in the bypass pipe 17, these regulating valves 20 and 21 can be completely closed during operation of the cooling tower, and a portion of the spray water will be exposed to the ultraviolet rays. Sterilizer 18 (=
18a), and in this state, the ultraviolet sterilizer 18 (=18a) is connected to the bypass pipe 1.
7 can be removed, cleaned, and repaired.
Furthermore, these first and second spray water flow rate adjustment valves 2
0, 21, by providing a third spray water flow rate regulating valve 22 provided in the riser pipe 16,
Spray an appropriate amount of water into the ultraviolet sterilizer 18 (=18a)
You can detour to

In particular, in the second embodiment, a brush body 24 and an impeller 25, which are rotated by the flow of sprayed water flowing through the ultraviolet sterilizer 18a, are provided over the entire length of the sterilizing lamp 19 so as to surround the circumferential surface of the sterilizing lamp 19. Therefore, while a part of the sprayed water is sterilized by the sterilizing lamp 19, the brush body 2 that comes into sliding contact with the peripheral surface of the sterilizing lamp 19
4, cleaning can be performed automatically, the amount and intensity of ultraviolet light emitted from the sterilizing lamp 19 can be maintained approximately constant, and a portion of the sprayed water can be efficiently sterilized.

[Brief explanation of the drawing]

The figure is related to this invention.
Schematic diagrams of the embodiment, FIGS. 2 and 3 are piping diagrams showing different examples of the ultraviolet sterilizer part, and FIG.
The figure is a piping diagram showing the ultraviolet sterilizer part of the second embodiment. Explanation of the main symbols in the figure: 18, 18a... Ultraviolet sterilizer.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Spraying warmed circulating cooling water supplied from the load section into the closed heat exchanger and flowing through the closed heat exchanger over the heat exchanger in order to cool it in a non-contact manner. Water is sprayed, allowed to flow down on the surface of the heat exchanger, and once collected in a lower water tank, is pumped up from the lower water tank via a riser pipe and onto the heat exchanger again using a water pump, and is circulated and sprayed again to repeatedly deplete the circulating cooling water. In a closed cooling tower of the type in which the circulating cooling water is cooled by contact and is sent as cold water to the load section for reuse, a flowing water type ultraviolet sterilizer for sterilizing the sprayed water is provided in the riser piping system. A closed cooling tower featuring: 2. The ultraviolet sterilizer is arranged in a bypass pipe branched from the riser pipe, and above and downstream of the ultraviolet sterilizer, the bypass pipe includes:
The closed type cooling tower according to claim 1, each of which is provided with one spray water flow rate regulating valve. 3. The closed cooling tower according to claim 2, wherein the ultraviolet sterilizer is an internally illuminated or externally illuminated type. 4. The closed cooling tower according to claim 3, wherein the internal illumination type ultraviolet sterilizer is an ultraviolet sterilizer with a self-cleaning device.