JP2000039270A - Cooling tower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure stabilized control while simplifying piping work by disposing means for stirring water in the outlet coupling pipe of a cooling tower on the upstream side of a sensor. SOLUTION: The outlet coupling pipe 16 of a cooling tower comprises a short pipe section 161 and a flange 162 and the suction end is opened to a lower water tank 15. A flange is provided for the led out outer part and fixed to the side face part of the lower water tank 15 by welding, for example. An outlet water temperature sensor 18 is fixed watertightly to the wall of the pipe 16 on the downstream side of the short pipe section 161 while projecting the temperature-sensitive part into the pipe and stirring parts Pa, Pb, Pc are disposed at a plurality of points on the upstream side of the sensor 18. Water flowing from the lower water tank 15 the outlet coupling pipe 16 while having temperature difference is stirred through stirring action of the stirring parts thus measuring temperature accurately at the temperature-sensitive part the sensor 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a cooling tower that recirculates and uses cooling water.

[0002]

2. Description of the Related Art FIG. 6 is a schematic view of an entire cross-flow cooling tower as an example of a conventional cooling tower. In FIG. 6, 1 is a cooling tower, 11 is a water supply pipe, 12 is a watering tank, 13 is a filler,
4 is a louver, 15 is a lower water tank, 16A is an outlet connection pipe,
17 is a blower, 18A is a sensor for measuring the outlet water temperature, 21 to 21
25 and 27 are circulating water pipes, 21L to 24L are elbow type pipe members, and 26 is a refrigerator including a circulating pump,
The circulating water pipe 27 is connected to the water supply pipe 11. In FIG. 6, a stand and the like are not shown.

The flow of water in the cooling tower 1 is such that circulating water warmed by a load device such as a refrigerator 26 is supplied to a water supply pipe 11 by a circulation pump (not shown), and the water is supplied from the water supply pipe 11 to the sprinkler tank 1.
2. Next, water is sprinkled over the entire area of the filler 13 through a water sprinkling hole (not shown) on the lower surface of the water sprinkling tank 12 to flow down. During this flow, the cold air sucked from the louver 14 by the exhaust power of the blower 17 comes into contact with the flowing water of the filler 13, and the flowing water is cooled and collected in the lower water tank 15. The collected water is supplied again to the water spray tank 12 as circulating water through the outlet connection pipe 16A.

Since the cooling tower 1 needs to maintain a constant cooling water temperature, if the cooling capacity is increased due to a decrease in the outside air temperature and the falling water of the filler 13 may be overcooled, the cooling tower 1 The outlet water temperature Tc is measured by an outlet water temperature measuring sensor 18A, and the blower 17 is stopped by temperature control means (not shown).
If the temperature is too high, measures such as rotating the blower 17 by a temperature control means (not shown) to continue cooling are taken.

[0005]

However, in the cross-flow cooling tower 1, the water temperature T after flowing down the outside of the filler 13, which is directly exposed to the outside air temperature, on the side close to the louver 14.
a is low, while the water temperature Tb after flowing down the central portion of the filler 13 is high, and the temperature difference between the two often occurs clearly. Since each of the flowing waters flows into the outlet connecting pipe 16A while having a temperature difference, the outlet-side water temperature Tc of the cooling tower fluctuates excessively and cannot be accurately measured. 18B, a position where the cooling water on the outlet side of the cooling tower is naturally stirred, that is, the outlet connecting pipe 1
6A, or must be provided after the elbow-type piping members 21L to 24L are provided near the outlet connection pipe 16A and forcibly agitated, in terms of construction and cost. There was a problem.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a cooling tower according to claim 1 is provided with a sensor for measuring the water temperature at the outlet of the cooling tower attached to the outlet connecting pipe of the cooling tower. In the cooling tower, water stirring means is provided in the outlet connection pipe of the cooling tower and on the upstream side of the sensor.

Further, the cooling tower according to claim 2 is characterized in that the stirring means is a plate-like body provided perpendicular to the inner wall of the outlet connection pipe. The cooling tower according to claim 4 is characterized in that the stirring means is a rod-like body vertically provided on the inner wall of the outlet connection pipe. .

That is, the present invention provides a cooling tower provided with water agitating means in the outlet connecting pipe and upstream of the temperature sensor so that the outlet water temperature of the cooling tower can be accurately measured in the outlet connecting pipe.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The cooling tower of the present invention will be described in detail with reference to FIGS. FIG. 1 is a partially enlarged schematic sectional view of the vicinity of an outlet connecting pipe of the cooling tower of the present invention. FIGS. 2 to 5 show first to fourth water stirring means used in the cooling tower of the present invention.
It is a schematic diagram which shows an Example.

Before the description of the present invention, a comparison between FIG. 1 showing the vicinity of the outlet connection pipe of the present invention and FIG. 6 showing a conventional cooling tower shows that (a) the water supply pipe 11 of FIG. The water tank 12, the filler 13, the louver 14, the blower 17, the refrigerator 26 including the circulation pump, and the circulation water pipes 21, 25, 27 are not shown in FIG. 1 but may be considered to be the same in FIG. ,
(B) The lower tank 15 of FIG. 1 and FIG. 6 is the same,
(C) The outlet connection pipe 16 of FIG. 1 is the outlet connection pipe 16A of FIG.
(D) The mounting position of the sensor 18 in FIG. 1 is inside the outlet connection pipe 16 and FIG.
Is different from the mounting position of the sensor 18B of FIG.
In FIG. 6, the elbow type piping members 21L to 24L in FIG. 6 are unnecessary.

As shown in FIG. 1, the outlet connection pipe 16 of the cooling tower
Is composed of a short pipe portion 161 and a flange 162, has a suction end opened in the lower water tank 15, and is provided with a flange on the outside of the lower water tank 15, and is attached to a side surface of the lower water tank 15 by welding or the like. Short pipe part 161 of outlet connection pipe 16
An outlet water temperature measuring sensor 18 is attached to the pipe wall in a state where the temperature sensing part projects into the pipe downstream of the sensor, and a plurality of stirring parts Pa and P are provided at a plurality of locations on the upstream side of the sensor 18.
b and Pc are provided. Lower water tank 1 with temperature difference
The water that has flowed into the outlet connection pipe 16 from the fifth side is agitated by the agitation action of the agitating component, so that the temperature-sensitive portion of the sensor 18 can accurately measure.

In FIG. 1, three stirring parts are temporarily provided. However, the number of the stirring parts is not limited to three. The stirring parts can be freely changed in consideration of the water stirring performance, economy and workability. Can be done. Further, in the following description of the embodiment, the stirring part is shown as a flat plate, but the present invention is not limited to this, and the stirring part may be pipe-shaped or rod-shaped. The cross section of the rod-shaped object may be round or square.

2 to 5 will be described. In each figure,
The left end side is upstream and the lower water tank 15 side, and the right end side is downstream and the flange 162 side. The portion indicated by the dotted line in the drawing is the outlet connection pipe 16 composed of the short pipe portion 161 and the flange 162, and the outlet water temperature measurement sensor 18 is further described on the downstream side by the dotted line. A circle drawn by a solid line in the short tube portion 161 indicates the inner wall surface of the short tube portion 161, and a black portion in the solid line inner wall surface indicates the shape and arrangement of the stirring plate as a stirring component, and accordingly, the outlet The number of stirring plates provided in the connection pipe 16 is the number of circles drawn by solid lines.

Referring to FIG. 2, a description will be given of a stirring plate which is a first embodiment of a stirring component used in the cooling tower of the present invention. This stirring plate is composed of a crescent-shaped stirring plate P11 welded to the upstream side (left side in the figure) of the inner wall portion of the short pipe portion 161 and a crescent-shaped stirring plate P12 welded to the downstream side (right side in the figure). It consists of two stirring plates. The cooling water flow having a temperature difference is caused by the stirring plate P
Turbulence is caused by the baffle effect of the stirring plate 11 and the stirring plate P12, and no stirring plate is provided on the upper side of the inner wall portion of the short tube portion 161 to use as a water channel for letting the trapped air bubbles escape. At the same time, no stirring plate is provided on the lower side of the inner wall portion of the short pipe portion 161, and the stirring plate is used as a water channel for washing out entangled refuse and solid matter. In this way, the cooling water is sufficiently stirred without impairing the function of the water channel.

Referring to FIG. 3, a stirring plate which is a second embodiment of the stirring component will be described. This stir plate has an arrangement in which the combination of the stir plate P11 and the stir plate P12 in FIG. 2 described above is repeated twice on the inner wall portion of the short tube portion 161, and the stir plates P11, P11, It is composed of four stirring plates such as a stirring plate P12, a stirring plate P11 and a stirring plate P12. The cooling water flow having a temperature difference has a further turbulent flow effect by repeating the example of FIG. 2 twice, and similarly to FIG. 2, a water channel on the upper side of the short pipe portion for releasing the trapped air bubbles is provided. A waterway is provided at the lower part of the short pipe section to remove entrained debris and solids. In this way, the cooling water is sufficiently stirred without impairing the function of the water channel.

A stirring plate which is a third embodiment of the stirring component will be described with reference to FIG. The stirring plate has a narrow band-shaped stirring plate P21 which is welded to the upstream side of the inner wall of the short tube portion 161 so as to avoid the vicinity of the upper end, and a lower end portion downstream of the inner wall portion of the short tube portion 161. And a stirrer plate P22 in the form of a narrow band which is welded to avoid the vicinity of the right shoulder. The cooling water flow having a temperature difference is turbulent due to the baffle plate effect between the stirring plate P21 and the stirring plate P22, and a water channel on the upper side of the short pipe portion for releasing the entrained bubbles as in FIG. There is a waterway at the bottom of the short pipe section to remove entrained debris and solids. In this way, the cooling water is sufficiently stirred without impairing the function of the water channel.

Referring to FIG. 5, a stirring plate which is a fourth embodiment of the stirring component will be described. This stirring plate is a crescent-shaped stirring plate P3 welded to the left side wall on the upstream side of the inner wall portion of the short pipe portion 161.
1, a crescent-shaped stirring plate P32 welded to the right side wall of the middle part of the upstream and downstream, and a strip-shaped stirring plate P33 rising slightly to the right on the downstream side so as to avoid the vicinity of the lower end, Consists of three stirring plates. The cooling water flow having the temperature difference is the stirring plate P
The turbulence is generated by the baffle plate effect of the agitating plate 31, the agitating plate P32, and the agitating plate P33, and the water channel on the upper side of the short pipe portion and the garbage and solids trapped in the same manner as in FIG. A waterway is provided below the short pipe section to wash away objects. In this way, the cooling water is sufficiently stirred without impairing the function of the water channel.

The length of the short pipe portion 161 is preferably about 30 cm in consideration of the welding operation of the stirring plate, but is not limited to this as long as it can be performed in construction. Further, the present invention can be applied not only to the above-described cross-flow cooling tower, but also to a counter-flow cooling tower or the like.

The installation procedure of the outlet connection pipe 16 used in the present invention is, for example, to prepare a short pipe with a flange of about 30 cm in length and a required pipe diameter, and to easily work each stirring part on the inner surface of the pipe. The outlet water temperature measurement sensor 18 may be welded in a watertight manner to form a short pipe with a processed flange, and the processed short pipe with a flange may be subjected to penetration welding or flange fastening to the side wall of the lower water tank 15.

If the outlet connection pipe 16 itself is provided with a function of improving the stirring performance of the cooling water as described above, the cooling water temperature T becomes a precisely averaged water temperature, and the cooling water temperature T is located at the position of the averaged water temperature. Since the outlet water temperature sensor 18 is provided, a temperature control unit and a motor rotation speed control unit (neither is shown) based on the detection value of the sensor 18
The energy-saving operation of the blower can be performed reliably and simply by using the air conditioner, and there is no need to provide an extra piping member, so that the problems in the conventional construction and cost can be solved.

[0021]

As described above, according to the present invention, in a cooling tower in which a sensor for measuring the water temperature at the outlet of the cooling tower is attached to the outlet connecting pipe of the cooling tower, the cooling water is located within the outlet connecting pipe of the cooling tower and upstream of the sensor. The cooling tower is provided with a water stirring means, so that the passing water temperature of the outlet connection pipe becomes a precisely averaged value due to the stirring performance of the stirring means composed of a plurality of stirring parts. Therefore, it is only necessary to provide the sensor near the most downstream in the outlet connection pipe,
In the control aspect, stable control is possible, in the construction aspect, the piping structure is simplified, and the cost is reduced.

[Brief description of the drawings]

FIG. 1 is a partially enlarged schematic cross-sectional view of the vicinity of an outlet connection pipe of a cooling tower according to the present invention.

FIG. 2 is a schematic view showing a first embodiment of water stirring means used in the cooling tower of the present invention.

FIG. 3 is a schematic diagram showing a second embodiment of the water stirring means.

FIG. 4 is a schematic view showing a third embodiment of the water stirring means.

FIG. 5 is a schematic view showing a fourth embodiment of the water stirring means.

FIG. 6 is an overall schematic diagram of a conventional cross-flow cooling tower.

[Explanation of symbols]

15 Lower water tank 16 Outlet connection pipe P11, P12, P21, P22, P31 to P33
Stirring plate 18 Sensor for measuring cooling water temperature T Cooling water temperature

Claims (4)

[Claims] 1. A cooling tower in which a sensor for measuring the outlet water temperature of a cooling tower is attached to an outlet connecting pipe of the cooling tower, wherein a means for stirring water is provided in the outlet connecting pipe of the cooling tower and upstream of the sensor. A cooling tower. 2. The cooling tower according to claim 1, wherein the stirring means is a plate-like body provided vertically on the inner wall of the outlet connection pipe. 3. The cooling tower according to claim 1, wherein the stirring means is a tubular body provided vertically on the inner wall of the outlet connection pipe. 4. The cooling tower according to claim 1, wherein the stirring means is a rod-shaped body provided vertically on the inner wall of the outlet connection pipe.