KR20030052555A - Cooling tower of Rotary Type - Google Patents

Abstract

PURPOSE: A rotary cooling tower is provided to automatically starting and stopping the cooling tower according to the predetermined temperature, prevent locking of the rotating part, and improve cooling efficiency. CONSTITUTION: A rotary cooling tower(50) comprises an outlet temperature sensor(62) to detect the temperature of a coolant discharged from the cooling tower; a control unit(60) comparing the temperature detected from the outlet temperature sensor with a predetermined temperature and outputting a motor control signal for switching a fan motor(64) installed to the cooling tower on/off or for accelerating and decelerating the speed; and an inverter(66) controlling a driving current flowing into the fan motor by the motor control signal output from the control unit. The cooling tower comprises a rotary coupler(70) having plural radial distribution pipes, a rotary guide mechanism installed to the upper end portion of the fixed distribution pipe, to guide the rotary coupler; plural water spray pipes(74) having coolant injection holes(74a) for injecting the coolant; a turbine blade rotating the rotary coupler with the rotary power given from the oil pressure of the coolant; and a differential clutch installed between the rotary coupler and a fan shaft(64a), to transmit rotary power of the rotary coupler to the fan shaft or cutting off the rotary power.

Description

Cooling Tower of Rotary Type

The present invention relates to a rotary cooling tower for cooling industrial cooling water, and more particularly, to allow the sprinkling pipe to be rotated at low speed by the fluid energy of the cooling water so that the cooling water is sprayed and sprayed evenly. When the motor is stopped, the rotational force using the coolant as the power source is transmitted to the fan shaft via the differential clutch to prevent the fixing of the rotating parts such as bearings.The feedback temperature is controlled by comparing the outlet temperature of the cooling tower with the set temperature. The present invention relates to a rotary cooling tower to be automatically adjusted within a certain deviation.

In general, a cooling tower is a type of heat exchanger that draws heat from high-temperature cooling water and lowers the water temperature by evaporating a portion of the water by directly contacting the cold air and the cooling water to reuse the cooling water used in the cooler. Cooling water flows on the cooling towers and air is blown from the bottom.

In addition, the cooling tower is divided into counterflow type and crossflow type according to the heat exchange method. The cooling tower is classified into natural ventilation type and forced ventilation type according to the ventilation method. have.

In addition, the cooling tower is mainly used for cooling large-capacity industrial machines such as steel mills, chemical plants, food plants, and wastewater treatment plants. Especially, the cooling towers used in steel mills are used to cool extra large synchronous motors of blowers that supply hot air. It is used to cool equipment which is easy to overheat, such as a cooler.

Among the cooling towers, a conventional cooling tower made of a forced ventilation type is shown in FIG. 1. As shown in the drawing, a cooling fan 14 rotated by a fan motor 12 is installed at an upper center of the cooling tower 10. The air was sucked from the lower part of the cooling tower 10 to be discharged to the outlet of the upper side, and the vertical tube 16 into which the cooling water (W1) from which heat was taken is introduced is installed in the inner lower center of the cooling tower (10). there was.

In addition, for example, four water pipes 20 for spraying the cooling water W1 are radially fixed to the upper end of the vertical pipe 16, as shown in FIGS. 2 and 3. In order to prevent sagging of the 20, the upper end of the vertical pipe 16 and the free end of the watering pipe 20 were connected through the tension rope 22, and the filler 18 in the lower side of the cooling tower (10) Is installed to increase the cooling efficiency by increasing the heat exchange area of the cooling water (W1) falling from the sprinkling pipe (20).

In addition, a manual valve 24 is installed in the inlet pipe 19 leading to the vertical pipe 16 of the cooling tower 10 to block or open a flow path through which the coolant W1 flows. In the lower part of the cooling tower 10, a discharge pipe 26 for discharging the coolant W1 collected after cooling is installed, and the fan motor 12 is connected to an operation panel 28 installed in an electrical room for remote control. It was configured to be.

In addition, the sprinkling pipe 20 has a plurality of cooling water injection holes 21 are formed at equal intervals in the longitudinal direction, the cooling water injection hole 21 is formed vertically downward toward the filler 18 It was comprised so that the cooling water W1 may be injected.

On the other hand, Figure 4 is a view showing a conventional cooling tower applied to the cooling of the blower, for cooling the cooling water (W1) circulated through the plurality of pumps 30, 31, 32 as shown therein Branched to the coolers of each blower (33) (34) and (35), heat exchanged, and then flowed into the respective cooling towers (36) (37) (38) (39) through parallel flow paths, and then cooled and gathered to the place. Afterwards, it was configured to be distributed and circulated again to the coolers of the blower facilities 33, 34, 35.

In addition, manual valves V1, V2, V3, and V4 are installed in series at the inlets of the cooling towers 36, 37, 38, and 39 to block or open the flow path. A thermometer 40 for measuring the temperature of the cooling water W1 discharged and collected from the plurality of cooling towers 36, 37, 38, and 39 was installed in the pipe through which water flows, and each blower 33 is provided. Thermometers 42, 43 and 44 were also installed in (34) and (35) to check that cooling was performed properly.

However, since the conventional cooling tower is not equipped with a device capable of automatically adjusting the temperature control as shown in Figure 4, the operator judges by looking at the thermometer installed in the cooling water line one by one cooling tower (36) (37) (38) Temperature is difficult to control because the number of operating of the (39) has been determined and the fan motors (36a) (37a) (38a) (39a) on the cooling towers (36) (37) (38) (39) were started and stopped. However, since temperature management is performed manually at a relatively long time interval, there is a problem that the temperature deviation is severe because overheating or subcooling may occur during the time when the temperature management is not performed.

In addition, when the fan motor 12 is in a stopped state for a long time as shown in FIG. 1, bearings for supporting the fan motor 12 may be premature due to high temperature water vapor generated inside the cooling tower 10. There was a problem that it is impossible to operate because it is stuck to, and to operate it normally, there was an economic burden to repair and repair at a high cost.

Also, as shown in FIGS. 2 and 3, the water spray pipe 20 installed in the cooling tower 10 is installed in a fixed state, and the cooling water spray hole formed in the water spray pipe 20 ( Since 21) is formed vertically downward, the cooling water W1 sprayed therethrough is not sprayed evenly on the lower filler 18, and is concentrated only on a portion (hatched in FIG. 3), thereby greatly improving cooling efficiency. Had problems falling.

The present invention has been made to solve the above problems, the object is that the start / stop of the cooling tower according to the set temperature can be made automatically, even if the fan motor is stopped to maintain the low-speed rotation by the water pressure rotating part It is possible to prevent the seizure of the, and to provide a rotary cooling tower that can improve the cooling efficiency by allowing the cooling water is injected more evenly to the filler.

1 is a cross-sectional perspective view showing the structure of a conventional cooling tower

Figure 2 is a front view showing the structure of the spray pipe provided in the conventional cooling tower

3 is a plan view showing the structure of the watering pipe provided in the conventional cooling tower

4 is a view showing the flow of cooling water in a plurality of cooling towers applied to the conventional cooling of the blower facility.

5 is a view showing the configuration of a rotary cooling tower according to the present invention

6 is a cross-sectional view showing the configuration of a rotary cooling tower according to the present invention.

Figure 7a is an exploded perspective view showing an extract of the differential clutch couple in the rotary cooling tower according to the present invention

Figure 7b is an exploded perspective view showing a portion of the rotary coupler in the rotary cooling tower according to the present invention

8 is a plan view showing an extract of the rotary coupler in the rotary cooling tower according to the present invention;

Figure 9a is a perspective view showing a state in which power is connected to the fan shaft from the rotary coupler by the differential clutch according to the present invention

Figure 9b is a perspective view showing the disconnected state of the rotary coupler and the fan shaft by the differential clutch according to the present invention

10 is a view showing that the cooling tower according to the present invention is applied to the cooling of the blower facility.

11 is a flowchart for explaining the operation of the control device for controlling the cooling tower according to the present invention.

* Explanation of Signs of Major Parts of Drawings *

50: cooling tower 54: fixed piping

60 control unit 62 outlet temperature sensor

64: fan motor 64a: fan shaft

66: inverter 70: rotary coupler

72: radial distribution tube 72a: cooling water injection hole

74: watering pipe 76: turbine blade

80: rotation guide mechanism 82: fixed shaft

84: bearing 90: differential clutch

92: helical shaft 92a: spiral portion

94: serration axis 96: serration hall

W2: coolant

In order to achieve the object of the present invention, the outlet temperature sensor for detecting the temperature of the cooling water discharged from the cooling tower, the temperature detected by the outlet temperature sensor and the preset temperature is compared with the fan motor provided in each cooling tower ON / It is characterized by consisting of a control unit for outputting a motor control signal for turning OFF or acceleration / deceleration and an inverter provided in each cooling tower to control the drive current flowing to the fan motor by the motor control signal output from the control unit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

5 and 6 are views and cross-sectional views respectively showing the configuration of the rotary cooling tower according to the present invention, Figure 7b is an exploded perspective view showing an extract of the rotary coupler in the rotary cooling tower according to the present invention, As described above, an outlet temperature sensor 62 for detecting the temperature of the cooling water discharged from the cooling tower 50 is provided in each cooling tower 50 in comparison with the temperature detected by the outlet temperature sensor 62 and a preset set temperature. Each cooling tower 50 is provided by a control unit 60 for outputting a motor control signal for turning on / off or accelerating / decelerating a fan motor 64 and a motor control signal output from the control unit 60. And an inverter 66 for controlling the drive current flowing through the fan motor 64.

Here, the cooling tower 50 is provided with a rotary coupler 70 having a plurality of radially divided radially distributed pipes 72, and a rotation guide mechanism installed at an upper end of the fixed pipe 54 to rotate the rotary coupler 70. 80 and radially installed in the radial distribution pipe 72, and obtained from the water pressure of the plurality of watering pipes 74 and the water pressure of the cooling water W2 having the cooling water injection holes 74a for injecting the cooling water W2. Installed between the turbine blade 76 and the rotary coupler 70 and the fan shaft 64a for rotating the rotary coupler 70 by the rotational force, and the rotational force of the rotary coupler 70 according to the difference in the rotational force of both sides of the fan shaft 64a. It consists of a differential clutch (90) to pass or block.

The fixed pipe 54 is flanged to the upper end of the vertical pipe (54g) (54h) is installed vertically from the lower side inside the cooling tower (50).

The rotary coupler 70 may be configured such that, for example, six radial distribution pipes 72 are formed radially, as shown in FIG. 8, and a connection portion between the radial distribution pipes 72 and the sprinkling pipe 74. In the flange 72d (74d) was placed to facilitate the disassembly / assembly.

In addition, the rotation guide mechanism 80 has a lower end installed perpendicular to the center of the upper end of the fixed pipe 54, the upper end of the fixed shaft 82 and the outer ring through the rotary coupler 70 and the rotary coupler ( 70 is installed at the upper end of the center, the inner ring is composed of a bearing 84 is installed on the upper end of the fixed shaft 82, the lower end of the fixed shaft 82 is fixed pipe 54 through the nut (82d) Is connected perpendicular to the top center of the.

Here, an oil chamber 84k is installed between the bearing 84 and the rotary coupler 70 to prevent leakage.

The cooling water injection hole 74a is formed to be inclined to form an angle of 45 ° in the direction opposite to the rotation direction, for example.

Figure 7a is an exploded perspective view showing the differential clutch portion in the rotary cooling tower according to the present invention, as shown in the differential clutch 90 is installed in the center of the rotary coupler 70, the outer peripheral surface For example, a helical shaft 92 having a spiral portion 92a formed at an angle of 45 °, and a serration shaft screwed to the helical shaft 92 to interrupt power between the rotary coupler 70 and the fan shaft 64a ( 94) and the serration pipe 96 connected to the center of the fan shaft 64a and transmitting to the fan shaft 64a the rotational force transmitted from the serration shaft 94 while being engaged with or separated from the serration shaft 94. Configured.

A stop bolt 92g is installed at an upper end of the helical shaft 92 to prevent the serration shaft 94 from being separated.

In addition, the rotary coupler 70 is configured to cover the upper side with a bearing cover 84a, for example, to accommodate the bearing 84 therein, and the bearing cover 84a by a bolt 84h penetrating sideways. ) And the rotary coupler 70 is coupled.

In addition, the helical shaft 92, the serration shaft 94, and the serration pipe 96 constituting the differential clutch 90 are concealed by the oil tank 200 fixed to the upper end of the bearing cover 84a. The upper end of the oil tank 200 is provided with a cover 204 sealed with a gasket 202, and is opened and closed by a stopper bolt 206 on the upper surface of the cover 204 to inject grease therein. A grease injection port 208 is formed, and an oil is provided between the cover 204 and the fan shaft 64a to prevent a grease leak by blocking a gap between the fan shaft 64a penetrating the center of the cover 204. The seal 209 is installed, and an oil chamber 210 is installed between the helical shaft 92 and the oil tank 200.

In addition, the oil tank 200 is fixed by a fastening bolt 207 which is screwed to the upper surface of the bearing cover 84a through the bottom surface.

On the other hand, Figure 10 is a plurality of cooling towers 300, 302, 304, 306 the same as the cooling tower 50 according to the present invention is applied to the cooling of the blower facility, as shown in the cooling water ( W2) is circulated through the plurality of pumps P1, P2, and P3, and the cooling water W2 is branched to a cooler provided in each blower 400, 402, 404, and then heat exchanged. The cooling towers 300, 302, 304, and 306 flow through the flow paths, respectively, and then cooled and collected in one place, and then distributed and circulated to the coolers of the blower facilities 400, 402, and 404.

In addition, automatic valves SV1, SV2, SV3, SV4, and manual valves V12, V13, V14, and V15 are provided at the inlets of the cooling towers 300, 302, 304, and 306, respectively. It is installed in series to block or open the flow path, the outlet temperature sensor 62 for detecting the temperature of the cooling water (W2) is discharged from the plurality of cooling towers (300, 302, 304, 306) is collected It is installed in a pipe through which water flows, and each blower 400, 402, 404 is provided with thermometers 410, 412, 414 for checking that cooling is performed properly.

In the figure, reference numeral 64k denotes a speed reducer for reducing the rotational force of the fan motor 64.

Hereinafter, the operation according to the present invention will be described in detail with reference to the accompanying drawings.

At this time, as shown in FIGS. 5 and 6, the driver opens the manual valve 68, supplies power to the control terminal 100, the control unit 60, and the inverter 66, and then controls the control terminal 100. When the operation command of the cooling tower 50 is issued through the control unit 60, the control unit 60 opens the automatic valve 67 to supply the cooling water W2 pumped by the pumps P1, P2, and P3 to the cooling tower 50. At the same time, the fan motor 64 is operated by the inverter 66 to rotate the cooling fan 65 connected to the fan shaft 64a to form an air flow in the cooling tower 50.

At this time, when the high temperature coolant W2 is supplied to the rotary coupler 70 via the open automatic valve 67 and the fixed pipe 54, the coolant W2 is radially formed in the rotary coupler 70. It is supplied to each sprinkling pipe 74 through the radial distribution pipe 72, and is injected to the filler 69 below through the cooling water injection hole 74a formed in the sprinkling pipe 74.

In this process, the cooling water W2 vertically rising to the rotary coupler 70 through the fixed pipe 54 hits the turbine blade 76 installed on the inner wall of the rotary coupler 70 and turns helically. As the hydraulic power of the cooling water W2 is transmitted to the turbine blade 76 laterally, the rotary coupler 70 rotates in the opposite direction to the turning direction of the cooling water W2.

At this time, the rotary coupler 70 and the sprinkling pipe 74 which are rotated by the turbine blade 76 are guided by the fixed shaft 82 and the bearing 84 constituting the rotation guide mechanism 80, and the fixed shaft The cooling water W2, which is horizontally rotated at the center of the 82 and is injected from the cooling water injection hole 74a of the sprinkling pipe 74, is evenly sprayed on the upper surface of the filler 69.

In addition, since the cooling water injection hole 74a formed in the sprinkling pipe 74 is formed to be inclined at a predetermined angle (for example, 45 °) in a direction opposite to the rotational direction, a slight negative pressure is formed in the cooling water injection hole 74a. W2) will be more smoothly discharged, and also serves to receive less wind resistance generated when the sprinkling pipe 74 is rotated.

Meanwhile, as shown in FIG. 11, the control unit 60 is discharged from each cooling tower 50 by the outlet temperature sensor 62 installed at the outlet of the cooling tower 50 in step S1 and collected in one place. The water temperature of (W2) is periodically detected. At this time, the controller 60 determines if the deviation between the outlet temperature detected in step S2 and the preset set temperature is less than the limit temperature (eg, 5 ° C.). In order to maintain the speed of the fan motor 64 being driven through the inverter 66 at, and the deviation is more than the limit temperature (for example, 5 ° C), the preset set temperature and the detected outlet temperature in step S4 to each other Will be compared.

That is, when the outlet temperature is less than the set temperature, the appropriate number of fan motors 64 are selected from the fan motors 64 running in step S5, and the fan motor 64 selected in step S6 is stopped again, and the automatic valve ( 67) to close the outlet temperature of the cooling water (W2) to be controlled.

When the fan motor 64 selected in this process is stopped, the speed of the fan shaft 64a gradually decreases and falls below the speed of the rotary coupler 70, and the rotary coupler 70 and the fan shaft are driven by the differential clutch 90. 64a are connected to each other so that the fan shaft 64a is rotated by the rotational force of the rotary coupler 70 as shown in FIG. 9A.

The power transmission action by the differential clutch 90 as described above is a fan motor that is being rotated at high speed while the helical shaft 92 installed at the upper center of the rotary coupler 70 is rotated together with the rotary coupler 70. When 64 is decelerated and falls below the rotational speed of the rotary coupler 70, a speed difference occurs between the low speed fan shaft 64a and the helical shaft 92 of medium speed (eg, 30 rpm), wherein the helical shaft 92 The serration shaft 94 is further forced by the helical shaft 92 because of the higher speed of the rotation, and is rotated in the direction of arrow "A" in the drawing, and at a predetermined angle (eg, 45 °) to the helical shaft 92. The horizontal rotational force acting on the serration shaft 94 by the spiral portion 92a is divided into two parts, the downward direction V1 and the lateral direction H1 in FIG. 9A, and are lowered downward. (96), the rotational force of the rotary coupler 70 is transferred to the fan shaft (64a) and fan motor (64) It is paenchuk (64a) and the fan motor 64 is rotating at the same speed as the rotating coupler (70).

Thereafter, when the outlet temperature of the cooling water W2 rises and the outlet temperature detected by the outlet temperature sensor 62 in step S4 of FIG. 11 becomes equal to or higher than the set temperature, the controller 60 stops the fan motor ( After selecting the appropriate number of fan motors 64 from 64), the fan motor 64 selected in step S8 is again operated, and the automatic valve 67 is opened to control the outlet temperature of the cooling water W2 to drop. .

When the fan motor 64 selected in this process is driven, when driven by the interleaver 66, the speed of the rotary coupler 70 is exceeded while gradually accelerating to the stationary fan shaft 64a. As shown in FIG. 9B, the rotary coupler 70 and the fan shaft 64a which are connected to each other are separated by the differential clutch 90 so that the fan shaft 64a and the cooling fan 65 are fastened by the fan motor 64. The rotary coupler 70 and the sprinkling pipe 74 are rotated at a low speed (eg, 30 rpm) by the turbine blade 76.

That is, the power interruption action by the differential clutch 90 causes the fan motor 64 to be stopped while the helical shaft 92 installed at the upper center of the rotary coupler 70 is being rotated together with the rotary coupler 70. When the acceleration is gradually accelerated to exceed the rotational speed of the rotary coupler 70, a speed difference occurs between the fan shaft 64a at a high speed (eg, 1800 rpm) and the helical shaft 92 at a medium speed (eg, 30 rpm). Since the speed of 64a is faster, the serration shaft 94 is further exerted by the serration pipe 96 which is rotated together with the fan shaft 64a, so that the serration shaft 94 is rotated in the direction of arrow "B" in the figure of FIG. 9B. At the same time, the horizontal rotational force acting on the serration shaft 94 by the spiral 92a formed at a predetermined angle (for example, 45 °) on the helical shaft 92 is the upper direction V2 and the lateral direction in the drawing of FIG. 9B. (H2) It is divided into two branches and ascended upwards, separated from the serration pipe 96, and connected to the rotary coupler 70. This is cut off.

In addition, the rotary ring 78 and the packing 79 installed between the rotary coupler 70 and the fixed pipe 54 prevent leakage from occurring between the rotary body and the fixed body.

As described above, the present invention is configured to be always rotated by a rotating body rotating with the hydraulic pressure of the coolant as a power source even when the driving current is blocked by the fan motor on the cooling tower, thereby preventing the attachment of the bearing and the rotating part. Since the cooling water sprayed from the water spray pipe is rotated in the horizontal direction by the rotary coupler to be sprayed at all times, the spraying can be more evenly improved to improve the cooling efficiency, and the cooling water spray hole is inclined at a predetermined angle. Since the resistance to the spraying direction can be reduced during rotation, the spraying effect can be smoothed. The temperature of the cooling water can be detected from time to time by using the exit temperature sensor installed at the outlet of the cooling water. Because it is configured to drive automatically It is able to reduce a variation has the effect of being able to prevent the supercooling and overheating of the cooling tower.

Claims (5)

An outlet temperature sensor 62 for detecting a temperature of the cooling water discharged from the cooling tower 50; Outputs a motor control signal for turning on / off or accelerating / decelerating the fan motor 64 provided in each cooling tower 50 by comparing the temperature detected from the outlet temperature sensor 62 with a preset set temperature. A control unit 60; Rotary cooling tower device, characterized in that consisting of an inverter 66 provided in each cooling tower 50 by the motor control signal output from the control unit 60 to control the drive current flowing to the fan motor (64). The cooling tower (50) of claim 1, further comprising: a rotary coupler (70) having a plurality of radial distribution pipes (72) radially branched; A rotation guide mechanism (80) installed at the upper end of the fixed pipe (54) to guide the rotation of the rotary coupler (70); A plurality of sprinkling tubes 74 radially installed in the radial distribution pipes 72 and having cooling water injection holes 74a for injecting cooling water W2; A turbine blade (76) for rotating the rotary coupler (70) with a rotational force obtained from the water pressure of the cooling water (W2); It is installed between the rotary coupler 70 and the fan shaft (64a) is characterized in that consisting of a differential clutch 90 for transmitting or blocking the rotational force of the rotary coupler 70 to the fan shaft (64a) according to the difference in the rotational force of both sides Rotary cooling tower unit. According to claim 2, The rotation guide mechanism 80 is the lower end is installed perpendicular to the center of the upper end of the fixed pipe 54, the upper end fixed shaft 82 through the rotary coupler 70; The outer ring is installed in the central upper end of the rotary coupler 70, the inner ring is a rotary cooling tower device, characterized in that consisting of a bearing (84) is installed on the upper end of the fixed shaft (82). The rotating cooling tower apparatus according to claim 2, wherein the cooling water injection hole (74a) is inclined to form a predetermined angle in a direction opposite to the rotation direction. The helical shaft (92) of claim 2, wherein the differential clutch (90) is installed at the center of the rotary coupler (70) and has a spiral portion (92a) formed on an outer circumferential surface thereof; A serration shaft 94 screwed to the helical shaft 92 to control power between the rotary coupler 70 and the fan shaft 64a; Connected to the center of the fan shaft (64a), it is composed of a serration pipe (96) for transmitting to the fan shaft (64a) the rotational force transmitted from the serration shaft 94 while being engaged with or separated from the serration shaft (94) Rotary cooling tower device characterized in that.