JPH0631338Y2 - cooling tower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a cooling tower having a function of killing bacteria in circulating water.

<Prior art and its problems> In this type of cooling tower, the shape of the heat exchanger related to the improvement of the cooling efficiency of circulating water, the control of the flow rate of piping and circulating water, and the technology related to the improvement of the sprinkler are cooling Although making progress since the advent of towers, the type of sterilization of circulating water in cooling towers uses chemicals.

Recently, in the technical field of cooling towers from the viewpoint of public health, the advent of cooling towers having a sterilizing function of circulating water has been desired.

<Problems to be Solved by the Invention> This invention responds to the above-mentioned request and receives a part of circulating water by a simple means, and after sterilization, returns it to the lower water tank of the cooling tower to eliminate the harmful effects of the prior art. Is a cooling tower whose purpose is to provide to the market, that is, a problem to be solved.

<Means for Solving Problems> In this invention, a water receiving device for receiving a part of circulating water is provided in the cooling tower above the lower water tank of the cooling tower, and the discharge pipe of this water receiving device is the cooling tower. The discharge pipe is connected to the primary side of an external water tank that is juxtaposed outside the cooling tower, the secondary side of which is connected to the lower water tank and a circulating water bypass passage is formed outside the cooling tower. A cooling tower is characterized in that an ultraviolet sterilizer is immersed in the external water tank forming a part of the circulating water bypass passage.

<Operation of Device> The operation of the device having the above-described structure is as follows.

In the case of a countercurrent cooling tower, the circulating water sprinkled on the packing material filled in the cooling tower body comes into contact with the outside air taken from the outside air intake of the cooling tower while flowing down on the packing material, It is cooled by latent heat, dropped into the lower water tank, collected and supplied to the load part, where it is heated up and then sent again to the cooling tower to be sprayed on the packing material.

While falling from this filling material to the lower water tank, a part of the circulating water is received by the water receiving device and guided through the discharge pipe into the external water tank provided side by side outside the cooling tower body.

While flowing in this external water tank from the primary side to the secondary side without power due to the height difference, the guided circulating water is sterilized by the ultraviolet sterilization device immersed in the external water tank, and in contact with the outside air. Bacteria mixed in the circulating water, overflowing from the secondary side of the external water tank in a state of sterilizing the microorganisms, this circulating water is returned to the lower water tank, after mixing with the residual circulating water flowing down from the filler, It is supplied from the lower water tank to the load part.

The volume ratio of the circulating water introduced into the external water tank is 10 to 20% of the total circulating water amount.

The present invention is not limited to the countercurrent cooling tower, and is the same as the invention when applied to the crossflow cooling tower, and also when the sealed heat exchanger is used instead of the packing material. is there.

<Effects of the Invention> The effects of the invention configured and acting as described above are as follows.

Part of the circulating water received by the water receiving device is supplied to an external water tank, and the received circulating water is gravity-flowed from the primary side to the secondary side by utilizing the height difference between the primary side and the secondary side. During this movement, after the sterilization treatment with an ultraviolet sterilizer, it has a structure that it is poured into the lower water tank and merged with the remaining circulating water and sent to the load part, so it is not necessary to use a pump other than the circulating water pump used for the known cooling tower. Without using a power source, it is possible to take in a suitable amount of circulating water and return it to the lower water tank after sterilization treatment.
It can be attached to a new cooling tower at the time of manufacture or can be added to an existing cooling tower without greatly expanding the installation place. Furthermore, the circulating water can be easily sterilized without causing secondary pollution due to the chemical treatment of the circulating water, and the occurrence of the local military disease caused by Legionella bacteria, which is said to be derived from the cooling tower circulating water system, can be eliminated.

At this time, the volume ratio of the circulating water introduced into the external water tank is set to 10 to 20% of the total amount of the circulating water, and at such a ratio, it is possible to suppress the growth of bacteria in the circulating water, and in particular, it is caused by the Regionola bacteria. Eliminate the occurrence of local military illness.

Next, a typical embodiment of this invention will be described.

<First Embodiment> In FIG. 1, A is an evaporation type countercurrent cooling tower, and an outside air intake 13 is formed in a cooling tower body 12 between a lower water tank 10 and a filler 11.

A funnel-shaped tray 14 which is a water receiving device for receiving a part of the circulating water falling from the filling material 11 to the lower water tank 10 is installed above the water surface of the lower water tank 10.

The discharge pipe 15 connected to the bottom of the tray 14 is the cooling tower body 1
2 Primary side short pipe 1 of an external water tank 16 that extends substantially horizontally to the outside and is provided at the outer end of the discharge pipe 15 in parallel outside the cooling tower A
7 is detachably connected.

A secondary side short pipe 18 of the external water tank 16 is an overflow pipe, is detachably connected to the lower water tank 10, and a circulating water bypass passage 19 is formed outside the cooling tower A.
An ultraviolet sterilizer 21 having a sterilizing lamp 20 extending from the secondary side short pipe 18 of the external water tank 16 forming a part of the circulating water bypass passage 19 toward the primary side short pipe 17 is detachably inserted and detachable. It is attached to the side wall of 16 and is immersed in the circulating water flowing in the external water tank 16.

A protective net 24 is provided around the quartz glass 23 surrounding the germicidal lamp 20, and a reflector plate 25 is provided on the inner wall of the external water tank 16.

26 and 27 are primary and secondary short pipes 17 and 1 of the external water tank 16.
It is an open / close valve that also serves as a flow rate adjusting valve provided in the lower water tank 10 and a discharge pipe 15 in which 8 are connected.

B is a sprinkler of this cooling tower A.

The operation of the first embodiment is as follows.

The cooling process of the circulating water in the counterflow type cooling tower A is the same as that of the known cooling tower of this type, and it is one of the circulating water flowing down from the packing material 11 in countercurrent contact with the outside air and cooled by the latent heat action. The part is once received by the receiving tray 14, then flows through the discharge pipe 15 and the primary side short pipe 17 in the external water tank 16 from the primary side to the secondary side by utilizing the height difference, and during this movement. Sterilized by the ultraviolet sterilizer 21 and returned to the lower water tank 10 through the secondary short pipe 18 which is an overflow pipe.
The remaining circulating water joins and is supplied to the load part, and after the temperature rises, the water is sprayed again from the water sprinkler B onto the filler 11.

The flow rate and flow velocity of the circulating water supplied from the tray 14 to the external water tank 16, that is, sterilized, is adjusted by the degree of throttling of the opening / closing valves 26 and 27 according to the quality of the circulating water.

During the continuous operation of the cooling tower A, if algae or the like adhere to the peripheral surface of the quartz glass 23 of the sterilizing lamp 20 and the sterilizing power of ultraviolet rays decreases, the external water tank 16 is emptied or the operation is continued. (2) With the on-off valves 26, 27 closed, the entire ultraviolet sterilizer 21 is pulled out from the inside of the external water tank 16 to wash off the algae and the like adhering to the quartz glass 23 and the protective net 24, and at the same time, wash the inside of the external water tank 16. Then, the ultraviolet ray sterilizer 21 is inserted again into the external water tank 16 and attached. It is preferable that the power source of the ultraviolet sterilizer is interlocked with a switch for starting and stopping the cooling tower, and that the power source is turned off independently.

When the capacity of the external water tank 16 is changed, the short pipes 17 and 18 on the primary side and the secondary side are removed from the corresponding discharge pipes 15 and the lower water tank 10, and the external water tank 16 having a new capacity is installed in the cooling tower A. Hold next to you outside.

<Second Embodiment> The difference from the first embodiment is that the water receiving area of the water receiving device 14a can be changed. Specifically, the inner pipe 28
Circulating water receiving port 29 on the upper surface over a range of about 180 °
An outer cylinder 30 for adjusting the circulating water receiving opening area is slidably fitted to the outer peripheral surface of the inner pipe 28. The inner pipe 28 and the outer cylinder 30 serve to receive the water. Device 14a
Are configured (see FIG. 3).

The discharge pipe 15 connected to the inner cylinder 28 of the water receiving device 14a passes through the main body 12 of the cooling tower A and extends to the outside. Other components having the same symbols as those in the first embodiment have the same configuration and operation as those in the first embodiment.

The operation of the second embodiment is as follows.

The outer cylinder 30 of the water receiving device 14a slides with respect to the inner cylinder 28,
The area of the receiving port 29 is adjusted, and the flow rate of the circulating water to the external water tank 16 is changed and adjusted.

In this state, the cooling tower A is operated to sterilize a part of the circulating water supplied to the external water tank 16 and return it to the lower water tank 10 as in the first embodiment.

In order to repair or replace the ultraviolet sterilization processing device 21 of the external water tank 16, the power supply is turned off, the inlet 29 is completely closed by the outer cylinder 30, and the secondary short pipe 18 is circulated through the external water tank 16. After all the water is made to flow into the lower water tank 10 and the outer water tank 16 is emptied, the ultraviolet sterilizer 21 is pulled out from the outer water tank 16 and cleaned, and then reloaded or replaced with a new one.

At this time, the on-off valves 26 and 27 of the first embodiment are not required, and the external water tank 16 is held by the cooling tower body 12 by a stay (not shown) so that it cannot be integrally separated.

Alternatively, the on-off valves 26, 27 are used only when cleaning or replacing the bypass passage 19 described above.

In addition, when the external water tank 16 is attached to an existing cooling tower, a joint port is provided in the discharge pipe of the pan similar to the pan 14 which is usually used as one component of the blowdown device, and the lower water tank 10 is provided with the joint port. Also has a joint mouth,
The short pipes 16 and 18 on the primary and secondary sides of the external water tank 16 are detachably connected to these joint ports respectively, and an ultraviolet device 21
The built-in external water tank 16 is arranged in parallel while being held by a stay extending outward from the existing cooling tower body.

<Third Embodiment> The first embodiment except that the tray 14 having the upper surface open to the bottom surface of the upper water tank 40 of the cross-flow cooling tower C shown in FIG. 4 is installed below the upper water tank 40. The same code as
It has the same structure and function. Reference numeral 41 is a closed heat exchanger.

The operation of the third embodiment is as follows.

A part of the circulating water flowing down from the upper water tank 40 to the closed heat exchanger 41 is transferred to the external pan 1 in the saucer 14 as in the first embodiment.
6, after sterilization, the cooling water flowing in the closed heat exchanger 41 while flowing down over the closed heat exchanger 41 is joined with the remaining circulating water indirectly cooled in the lower water tank 10a, and again. It is pumped up to the upper water tank 40.

The ultraviolet sterilizer 21 is repaired and replaced as in the first embodiment.

<Effects peculiar to the embodiment> When the ultraviolet sterilizer 21 is detachably mounted in the external water tank 16, the ultraviolet sterilizer 21 can be easily pulled out and cleaned while the external water tank 16 is empty.

When the external water tank 16 is detachably provided to the cooling tower body 12, the external water tank 16 can be easily installed in the cooling tower body 12 regardless of whether it is new or existing, and the inside of the external water tank 16 can be repaired or cleaned. In addition, the external water tanks 16 having different capacities can be easily replaced without taking up space.

The discharge pipe 15 to which the primary and secondary sides of the external water tank 16 are connected
When the on-off valves 26 and 27 are provided in the lower water tank 10, the inflow amount and the flow velocity of the circulating water into the lower water tank 16 are controlled by these on-off valves 2.
6 and 27 can be appropriately adjusted, and after the primary side opening / closing valve 26 is completely closed, the drain valve 50 provided at the bottom of the external water tank 16 is opened to circulate from the external water tank 16 during cleaning. Water can be completely drained to the lower aquarium 10.

In the second embodiment in which the water receiving device 14 is composed of the concentric inner cylinder 28 and the outer cylinder 30 and the water receiving area of the circulation inlet 29 can be changed and adjusted, the water receiving area of this inlet 29 is set before the operation. If it is set to an appropriate value, the circulating water suitable for sterilization can always be supplied to the external water tank 16, and the external water tank 16 can be completely closed by supplying the circulating water to the external water tank 16. Can be easily shut off.

When the outer water tank 16 is set almost horizontally, the outer water tank 16 can be stably attached to the cooling tower body 12 while being held.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 relates to the present invention, FIG. 1 is a schematic view of one embodiment, FIG. 2 is a longitudinal sectional view showing the main part thereof, and FIG. 3 is a schematic view of a second embodiment. FIG. 4 and FIG. 4 are schematic views of the third embodiment. Description of main symbols in the figure 10 ... Lower water tank, 14 ... Sauce, 15 ... Discharge pipe, 16 ... External water tank, 21 ... UV sterilizer.

Claims (9)

[Scope of utility model registration request] 1. A water receiving device for receiving a part of circulating water in a cooling tower is provided above a lower water tank of the cooling tower, and a discharge pipe of the water receiving device is extended outside the cooling tower. The discharge pipe is connected to the primary side of the external water tanks arranged side by side outside the cooling tower, the secondary side is connected to the lower water tank, and the circulating water bypass passage is formed outside the cooling tower. A cooling tower, wherein an ultraviolet sterilizer is immersed in the external water tank forming a part. 2. The cooling tower according to claim 1, wherein the ultraviolet sterilizer is a plug-in type ultraviolet sterilizer which is detachably attached to the external water tank. 3. The cooling tower according to claim 1, wherein the periphery of the ultraviolet sterilizer is covered with a protective net. 4. The cooling tower according to claim 1, wherein the cooling tower is a countercurrent cooling tower. 5. The cooling tower according to claim 1, wherein the cooling tower is a cross-flow type cooling tower. 6. The cooling tower according to claim 1, wherein the circulating water passage is substantially horizontal. 7. The cooling tower according to claim 1, wherein the external water tank is attached to the cooling tower main body in a holding manner. 8. The cooling tower according to claim 1, wherein the water receiving device has a water receiving area whose adjustment is adjustable. 9. The cooling tower according to claim 1, wherein the external water tank is removable from the cooling tower body.