KR200412707Y1 - control system for cooling tower - Google Patents

Abstract

In a cooling tower control system,

A microcontroller unit which compares and applies an input detection and interlocking signal with a set control value and outputs a control signal; It includes a micro-controller unit, the control value input unit for inputting and modifying the operation control value and condition, the signal input unit for detecting and interlocking signal is input, and the signal input through the signal input unit is compared with the control value and applied to control A control unit having a signal output unit for outputting a signal, a display unit for indicating control values, measurement values, and operation control states, and a power supply unit for supplying control power by dropping and rectifying an AC voltage to a required DC voltage; Configured in the control unit; An interlock control unit for interlocking and controlling the cooling fan motor power switch according to an operation (ON / OFF) signal input from the coolant circulation pump starter and an interlocking control signal output; Outputs one or more of a control temperature detection signal input from a coolant outlet temperature detector provided at a predetermined position of the cooling tower, a control temperature detection signal input from a coolant inlet temperature detector, and a control temperature detection signal input from an air supply temperature detector. A load control unit controlling the cooling fan motor in a full load operation mode, a load load operation mode, and a natural cooling operation mode according to the load control signal; A water quality control unit controlling the water quality management device according to the water quality detection signal inputted from the coolant water quality detector provided in one region of the collection tank of the cooling tower and the output water quality control signal; Overflow input from the overflow detector provided in the overflow pipe of the cooling tower is controlled by controlling the opening and closing of the supplementary water supply means in accordance with the water level detection signal input from the water level detector provided in one region of the water collection tank of the cooling tower and the output water level control signal. It provides a cooling tower control system comprising a water level control unit for controlling the opening and closing of the water-saving automatic valve in accordance with the detection signal and the overflow control signal output. As a result, power energy can be saved by controlling the full load, the reduced load, and the natural cooling operation mode of the cooling fan motor according to the cooling load fluctuation, and the water loss can be prevented by controlling the overflow loss of the cooling water. According to this, it is possible to easily apply the control unit of the cooling tower accessories to be added later, to improve the efficiency of the cooling tower and the control of the accessories and to reduce the cost.

Cooling tower, control system. Microcontroller, Load Control, Water Quality Control

Description

Cooling Tower Control System {control system for cooling tower}

1 is a schematic control configuration diagram of a cooling tower control unit according to the present invention,

2 is a schematic configuration diagram of a cooling tower control system according to a first embodiment of the present invention;

3 is a schematic installation example of the accessory and the detector of FIG. 2;

4A is a schematic flowchart of a control operation of FIG. 2;

4b is a schematic control operation flowchart of FIG. 2;

5 is a schematic configuration diagram of a cooling tower control system according to a second embodiment of the present invention;

6 is a schematic installation example of the attachment and detector of FIG. 5;

7A is a schematic flowchart of a control operation of FIG. 5;

7B is a schematic flowchart of a control operation of FIG. 5.

Explanation of symbols on the main parts of the drawings

1: control unit 2a, 2b: cooling tower control system

10: microcontroller unit 20: control value input unit

30: signal input unit 40: signal output unit

50: remote control input / output unit 60: display unit

70: alarm unit 80: external storage unit

90: power supply unit 100: interlock control unit

101: cooling water pump starter 102: fan motor power switch

103: spraying pump power switch 110: vibration control unit

111: vibration detector 120: load control unit

121: cooling water outlet temperature detector 122: cooling water inlet temperature detector

125: air supply temperature detector 127: operation mode switching unit

130: water quality control unit 131: cooling water quality detector

132, 260: water management device 140: water level control unit

141: water level detector 145: overflow detector

146: automatic water saving valve 147: supplementary water automatic valve

148: overflow alarm means 150: freezing prevention control unit

151: coolant temperature detector 152: coolant flow detector

200a: open cooling tower 200b: hermetic cooling tower

210a, 210b: heat exchanger 211: louver

212: eliminator 215: casing

216: sump tank 220: cooling fan

225: cooling fan motor 230a, 230b: water spray

235: float valve 240, 242: cooling water outflow pipe

241, 243: cooling water inlet pipe 244: supplementary water supply pipe

245: overflow pipe 246: drain valve

247: drainage pipe 248: water treatment agent input pipe

250: watering pump 270: heating heater power switch

280: heating heater

The present invention relates to a cooling tower control system, and more particularly to a cooling tower control system that can be controlled simply and efficiently by the integrated control of the cooling tower and accessories.

In general, in the air conditioner, refrigeration and refrigeration equipment, such as a freezer or industrial heat exchange equipment, the waste heat to be removed is accompanied by the waste heat to remove the waste heat to the atmosphere using a cooling medium. Cooling of cooling tower is divided into air-cooled cooling to make sensible cooling by forced convection of atmospheric air which is lower than the fluid to be cooled and evaporative cooling which uses cooling latent heat by contact of cooling water and air. It is widely used because it is more economical than any other cooling system and its cooling effect is great.

In general, a cooling tower is classified into a counter flow type cooling tower and a cross flow type cooling tower according to the flow type of cooling water and air, and the type of heat exchanger is an open type in which cooling water flows through the surface of the filler heat exchanger. Open circuit heat exchangers and cooling fluids (cooling water or refrigerant) flow into the heat exchanger of the sealed heat pipes and are classified as closed circuit heat exchangers, where the coolant flows along the surface of the heat pipes.

In addition, if the cooling fluid flowing in the sealed heat pipe is a cooling water, it is called a closed circuit type cooling tower. If the cooling fluid flowing in the heat pipe is a refrigerant, an evaporative cooling condenser is used. It is commonly called an evaporative cooling condenser.

And the conventional open cooling tower (200a), similar to the configuration of Figure 3 of the present invention, the air inlet (not shown) and the exhaust port (not shown) in communication with the fan housing (not shown) to form the louver 211 A casing 215 having a time) and forming a heat exchange region therein; A fan unit (not shown) including a cooling fan 220 for discharging air introduced through the air supply port through an exhaust port and a cooling fan motor 225 for driving the cooling fan; A heat exchange part (210a) formed of a filler and heat-exchanging with the cooling water flowing downward through the air introduced from the air supply port; A watering unit 230a disposed above the heat exchanger 210a to sprinkle water toward the heat exchanger 210a; Cooling water inlet pipe 241 for guiding the high temperature cooling water to the spraying unit (230a); An eliminator 212 for recovering water droplets scattered through the exhaust port into the cooling tower; A water collecting tank 216 for collecting the cooling water cooled through the heat exchanger 210a and discharging the cooling water through the cooling water discharge pipe 240 to the cooling load facility; A replenishment water supply pipe 244 and a float valve 235 for replenishing the cooling water consumed into the collection tank 216; An overflow pipe 245 configured to be disposed in a predetermined region of the upper end of the water collecting tank 216 to discharge the coolant overflowed; It consists of a drain valve 246 and the drain pipe 247 which drain the cooling water in the collection tank 216.

Conventional individual operational controls for such cooling towers and accessories are posted in the following known art.

Cooling water temperature control device of the cooling tower disclosed in Patent Publication No. 87-000986 (May 16, 1987),

And blow down apparatus and method as disclosed in US Pat. No. 4,475,536 (October 9, 1984);

Furthermore, the cooling tower water treatment disclosed in US Patent No. 6,746,609 B2 (June 8, 2004),

And ozonation of cooling tower water as disclosed in US Pat. No. 4,172,7866 (October 30, 1979) is known.

The above-described known operation of the cooling tower and the accessory control devices are individually configured to control the operation individually, it is difficult to control the integrated operation, there is a problem of increasing the installation area and cost by installing individually.

In addition, such a conventional cooling tower control device includes cooling tower accessories (vibration blocking device, water quality control device, anti-icing device, cooling water bypass device), white lead, which may be additionally installed in future. (Plume prevention device, fire prevention device, etc.) can not be prepared in advance, so the control means of the additional accessories to be added later may be restricted from the existing electrical and control equipment, as installation must be separately And there is a problem that the additional installation cost can be increased.

The known cooling tower supplies replenishment water to the sump through a float valve or a replenishment water automatic valve which is opened and closed by a change in water level for the replenishment of the cooling water consumed by the evaporation and scattering loss of the cooling water due to the evaporative cooling action, and reaches the proper level. If the float is broken, foreign matter is caught in the valve seat, or the valve is broken, the refill water continues to overflow unless the administrator detects and closes the valve. (Overflow) There is a problem that causes water loss by being discharged to the outside through the outlet.

In addition, the load control device of the known cooling tower controls the logarithmic operation of a plurality of cooling fan fan motors having a single rotational speed according to the load fluctuation detection signal, or rotates through a pole change motor (2-speed). It is common to control the load of the cooling fan by a variable voltage variable frequency control device that controls the speed or changes the frequency to operate the motor at a desired speed. Cooling fan fan motor continues to operate during operation, and the cooling water temperature is significantly lowered due to the decrease in load, and the natural cooling operation is performed even when the atmospheric temperature is lower (by cooling condensation in the cooling fan stopped state). Since cooling fan motor is operated without cooling), there is a problem of wasting power energy.

In addition, in an open type cooling tower operating in a low temperature system, when the cooling water is not circulated due to the abnormality of the cooling water circulation pump at sub-zero air temperature, the cooling water accumulated in the spray pipe, the cooling water remaining in the filler and the cooling water stored in the sump are frozen. Causes massive damage and driving disabilities.

Therefore, the conventional anti-icing control device which prevents freezing within a short time even if the circulation of the cooling water is temporarily stopped (that is, prevents rapid freezing upon drainage of the cooling water system to prevent freezing or resuming cooling water circulation), heats the cooling water circulated. Although it maintains a predetermined cooling water temperature by heating with a heater, there is a problem that the power energy consumption is large and causes an energy loss by heating the entire amount of the circulating cooling water.

And, in the closed cooling tower operating in the low temperature system, when the cooling water is not circulated due to the cooling water circulation pump at the sub-zero temperature, the condensed cooling water in the sealed heat pipe freezes in a short time and causes the sealed heat pipe to freeze. Will cause.

Therefore, the conventional anti-icing control device for operating a heating heater for heating the cooling water in the sump tank heat-controls the cooling water in the sump during the low temperature meter operation period of the cooling tower to maintain a predetermined cooling water temperature and to supply the heated cooling water to the sprinkling pump. It has a configuration that prevents freezing by continuously spraying on the heat exchanger (sealed heat pipe), but has a problem in that the power energy consumption is large and causes energy loss because the cooling water must be heated and the spray pump is operated during the low temperature system.

Therefore, an object of the present invention is to provide a cooling tower control system that can be easily and efficiently controlled by the integrated control of the cooling tower and accessories.

      Another object of the present invention is to provide a cooling tower control system that can reduce the power energy by controlling the full load, reduced load and natural cooling operation mode of the cooling fan motor in accordance with the cooling load fluctuation.

      Another object of the present invention is to provide a cooling tower control system that can prevent the loss of water by controlling the overflow loss of the cooling water.

An object of the present invention is to provide a cooling tower control system that can easily be applied to the control unit of the accessory to be added later if necessary.

Another object of the present invention is to provide a cooling tower control system that can reduce the cost and improve the efficiency of cooling tower and accessory control.

In order to achieve the above object, the present invention, in the cooling tower control system,

A microcontroller unit which compares and applies an input detection and interlocking signal with a set control value and outputs a control signal; Comprising the microcontroller unit, the control value input unit for inputting and modifying the operation control value and the condition, the signal input unit for inputting the detection and interlocking signal, the comparison and operation of the signal input through the signal input unit with the control value A control unit having a signal output unit for outputting a control signal, a display unit for indicating the control value, the measured value and the operation control state, and a power supply unit for supplying control power by dropping and rectifying an AC voltage to a required DC voltage; ; Configured in the control unit; An interlock control unit for interlocking and controlling the cooling fan motor power switch according to an operation (ON / OFF) signal input from the coolant circulation pump starter and an interlock control signal output; One or more of a control temperature detection signal input from a coolant outlet temperature detector provided at a predetermined position of the cooling tower, a control temperature detection signal input from a coolant inlet temperature detector, and a control temperature detection signal input from an air supply temperature detector. A load control unit controlling the cooling fan motor in a full load operation mode, a load reduction operation mode, and a natural cooling operation mode according to the output load control signal; A water quality control unit controlling a water quality management device according to a water quality detection signal inputted from a coolant water quality detector provided in one area of a collection tank of the cooling tower and an output water quality control signal; The opening and closing of the supplementary water supply means is controlled according to the water level detection signal input from the water level detector provided in one area of the collection tank of the cooling tower and the output water level control signal, and is input from the overflow detector provided in the overflow pipe of the cooling tower. It provides a cooling tower control system comprising a water level control unit for controlling the opening and closing of the water-saving automatic valve in accordance with the overflow detection signal and the overflow control signal output.

Here, the cooling tower control system, a counter flow type open cooling tower or hermetic cooling tower, a cross flow type developed cooling tower or hermetic cooling tower, and a counter flow evaporative cooling condenser or cross flow evaporation It can be applied to a cooling condenser.

The microcontroller unit is a well-known and widely used off-the-shelf product (for example, the 8051, 80196 series, etc. of Intel Corporation), and the description thereof will be omitted for the basic configuration and functions of the microcontroller unit.

The microcontroller unit includes a central processing unit (CPU), a RAM, a ROM in which a control program is stored, analog and digital signal converters (ADC, DAC), and a control signal input / output device (I). / O) and peripheral circuits and the like.

In addition, the ROM is preferably EEPROM (electrically erasable programmable read-only memory) that allows a user to modify the contents in the memory.

The microcontroller unit may include an interrupt circuit, a timer, a communication means (UART: universal asynchronous receiver / transmitter, USB: universal serial bus, etc.).

The microcontroller unit includes two-position control (On / Off control), proportional control (P / proportional-control), proportional integral control (PI / proportional-integral control), proportional differential control (PD / proportional-derivative control), Proportional Integral Control (PID / Pro

It can be applied to any one or multiple control methods depending on the control condition among the control methods of the Rtional Integral Derivative Control.

Next, the control software operating the cooling tower control system is preferably programmed to be compatible with a standard window operating system.

The control program may be connected to a keypad or touch screen configured in the control unit, or to a remote control input / output port configured in the control unit, to be used as a computer (desktop PC or laptop) or a portable device. It is preferable to operate and operate by an operation terminal (POT / portable operating terminal), PDA (Personal Digital Assistant).

In addition, the control unit preferably includes interlocking control of the cooling tower and the accessory, load control, water quality control, and water level control, and may further include vibration control and anti-ice control.

The control unit includes the operation of the coolant flow rate input from the coolant flow rate detector, the air supply wet bulb temperature input from the air supply temperature detector, the coolant outlet temperature input from the coolant outlet temperature detector, and the coolant inlet temperature input from the coolant inlet temperature detector. It may be configured to further include an operation efficiency integration unit having an operation efficiency integration and display function in real time to indicate the operation efficiency of the cooling tower by calculating a value.

The control unit includes control unit initialization procedure and diagnostic display, control control parameter parameter display, agreement display of each monitoring control point ADDRESS, operation state monitoring display of each device, alarm occurrence display in case of various abnormalities, Operation indications and misoperation indications, date (year-month-date) and time display at all times, input and display of maintenance schedules (maintenance, repair or replacement) by major components, recording of maintenance items (dates and contents), operation It can be configured to further include maintenance examples such as cumulative time accumulation, various schedules (total control points, status points, alarm points, measurement points, measurement upper and lower limits, etc.), and monitoring display functions such as power failure and recovery processing operation indications. have.

Here, the maintenance example, for each of the main components of the cooling tower (heat exchange unit, fan unit, eliminator, water tank, watering device, watering pump, cooling water heating heater, water quality management device, each detector, each automatic valve, etc.) Maintenance on the display unit according to the calculation of the check, repair, replacement schedule (or cumulative cumulative accumulated time) and operation time cumulative cumulative operation, taking into account the endurance of the component, regular maintenance period, and burnout due to aging. It is desirable to display the date and time in real time, and to complete the maintenance or replacement of the components that are completed after the initializing of operation hours (zero point), and the maintenance example schedule may be modified by the administrator as necessary. Do.

In addition, the control unit includes control control parameter parameter operation, alarm operation of date (year-month-date) and time, alarm operation of maintenance or replacement example time for each major component, request operation of various lists, and data of various programs. And a request operation function of an operation display item, such as a registration change operation, an address change operation of each control point, a power failure and recovery process (sequential startup) operation, and a request operation of other necessary items.

The control unit includes automatic recording of alarms (abnormal high water level, low water level, etc.), automatic recording at normal return, automatic recording at the time of change of state, various operation records, various control contents recording, data log function, maintenance by main components (checking) It can be configured to further include a recording (storage) function, such as a self-diagnosis record (eg, repair or replacement), and other necessary items.

The additional function of the control unit described above can be selectively applied as necessary.

Next, in order to simplify identification and management of the control system, the control unit including the microcontroller unit includes operation display means (lamps), wiring means (terminal blocks, etc.), and control power supply for the operation unit. Constituting a switch (switch or the like) or the like;

It is preferable that the module is divided into an interlocking control unit, a vibration control unit, a load control unit, a water quality control unit, a water level control unit, and an icing control unit.

And the control unit, the basic control parameters are stored, and recognizes and stores the data of the control operation state in real time, and comprises a Y pyrom to provide the basic data for the power failure compensation control operation when re-applied after power failure or artificial power off It can be configured to further include an external storage.

The control unit may further include a control computer of the central control center or a distributed control computer for controlling the control management area, and a remote control input / output unit capable of remote control through a portable terminal.

The control unit compares and applies the alarm detection signal inputted to the microcontroller unit with the set control value to operate the alarm means according to the alarm control signal outputted, and whether the detection alarm signal is released or artificially released by the administrator. In this case, it is preferable that the alarm unit further comprises an alarm unit, wherein the alarm unit includes any one of an alarm sound through a speaker, an alarm character displayed on a display unit, an alarm graphic or an alarm icon, an alarm lamp, or the like. It can be applied in plurality.

Next, the interlocking control unit compares the operation (ON / OFF) signal of the coolant circulation pump starter inputted to the microcontrol unit with a set control value and applies the interlocking control signal to output the cooling fan. It is preferable that the power supply switch of the motor, the cooling water outlet temperature detector power switch, or the power supply of the water spray pump power switch described later be turned ON and closed.

Here, the coolant circulation pump starter may be any one of a direct start operation, a Y-Δ start, a start by a start compensator, and a reactor start method.

The starter and power switch may be an electromagnetic contactor or an electromagnetic switch.

Next, in the load control unit, the cooling fan motor compares and outputs the detection signals tw1, tw2, tw3 and the respective detection signals of the cooling water outlet temperature detector input to the microcontroller unit with the set control values. In accordance with the control signal to be controlled, it is preferable to be controlled in the full load operation mode (detection signal tw1), the reduced load operation mode (detection signal tw2), and the natural cooling operation mode (detection signal tw3).

In the full load operation mode, it is preferable to operate by outputting 100% of the cooling fan rated capacity, and the light load operation mode is preferably operated by outputting less than 70% of the cooling fan rated capacity. When the temperature is drastically lowered and forced ventilation by the cooling fan is not necessary, the cooling fan motor is preferably turned off and operated in a natural cooling operation mode in which the cooling water is cooled by natural convection of the atmosphere.

In addition, the operation switching between the full load operation mode, the light load operation mode and the natural cooling operation mode is a point in time when a detection signal is input to the microcontroller unit in order to ensure stability (determining the persistence of the detection temperature and preventing the rapid operation switching of the driving unit). It is preferable to switch after a time delay of at least 10 seconds by the timer, but may be adjusted to the optimum time delay range according to the conditions of the switching operation.

The cooling fan motor is configured of a pole number conversion motor having an output of 100% at high speed and an output of 60% or less at low speed, a full load motor having an output of 100% of the load, and an output of 70% or less of the load. It is preferable to apply one of a combination of a light load motor having a load, and a plurality of cooling fans and a motor (number control) in which 100% cooling fan load is distributed. It is also possible to configure an inverter device that is variable to control the motor at a desired speed so that the cooling fan motor can be controlled in the full load operation mode, the light load operation mode and the natural cooling operation mode.

The cooling water outlet temperature detector, the cooling water inlet temperature detector, and the air supply temperature detector may be a temperature transmitter that detects a cooling water temperature in real time and inputs a detection signal to the microcontroller, but outputs a detection signal. It can also be applied to other types of detectors.

Here, the control temperature (tw1) which is operated in the full load operation mode when the design temperature condition of the cooling tower is a cooling water outlet temperature of 32 ° C and a cooling water inlet temperature of 37 ° C as an example of the detection temperature range of the cooling water outlet temperature detector. Preferably, the temperature is set between 30 ° C. and 33 ° C., and the control temperature tw2 which is operated in the light load operation mode is preferably set between 25 ° C. and 29 ° C., and the control temperature which is operated in the natural cooling operation mode ( It is preferable to set tw3) to 24 degrees C or less, but the control value of control temperature can also be adjusted to the optimal temperature range according to the temperature fluctuation conditions of cooling water.

The natural cooling operation mode may be operated according to the detection signal of the air supply temperature detector in place of the detection signal of the cooling water outlet temperature detector. In this case, the air supply temperature to be switched to the natural cooling operation mode is set to 18 ° C. or less. It is desirable to be.

The air supply temperature detector is preferably applied to any one of a wet bulb temperature detector and a wet-dry bulb temperature detector for simultaneously detecting a wet bulb temperature and a dry bulb temperature.

In the hermetic cooling tower to which the cooling tower control system of the present invention is applied, the water spray pump compares and applies the detection signals (ta1, ta2) and the respective detection signals of the air supply temperature detector inputted to the microcontroller unit to the set control values. Although it is preferable to perform the operation (ON / OFF) control by the output control signal, it is also possible to control the operation (ON / OFF) in accordance with the detection signal (tw1, tw3) of the cooling outlet temperature detector.

The air supply temperature detection signal detected in real time from the air supply temperature detector may be input to the microcontrol unit to monitor the air supply temperature on the display unit.

Further, in the hermetic cooling tower operating in the room temperature system, when the design wet bulb temperature condition of the cooling tower is assumed to be 27 ° C, the air supply temperature ta1 for turning on the sprinkling pump operation is 18 ° C or higher, and the sprinkling pump operation is performed. It is preferable to set the air supply temperature ta2 to be OFF at 18 ° C. or lower, but the control values of the air supply temperatures ta1 and ta2 may be adjusted to an optimum temperature range depending on the conditions.

Next, the coolant outlet temperature detector and the coolant inlet temperature detector input a detection signal to the microcontroller in real time to monitor the coolant outlet and the inlet temperature on the display unit.

Next, in the above description, the control of the cooling fan motor by full load operation, load reduction operation, and natural cooling operation is based on the detection signal of the cooling outlet temperature detector, but the cooling outlet temperature detector, the cooling water inlet temperature detector, and the air supply temperature detector are described above. It may control with the detection signal of any one or multiple detectors.

Next, the water quality management apparatus is operated according to a control signal outputted by comparing and applying a detection signal of the coolant water quality detector input to the microcontroller unit with a set control value, and efficiently managing the water quality of the coolant (cooling water The power switch of the water quality management device may be configured to further include an interlocking control in conjunction with a coolant pump starter (a spray water pump power switch in the case of a sealed cooling tower) while circulating the total amount of coolant.

And the water quality management device, a forced down (blow down or bleed-off) water quality management device for replacing the contaminated cooling water with a cleaner refill water through the automatic drain valve,

Chemical dosing water quality control device that treats the water within the water quality management standards by inputting the drug,

A side stream filtration water quality management device for removing suspended solids and dissolved solids in contaminated cooling water by filtration;

Ozone sterilization type water quality management device which dissolves ozone (Ozone: O₃) supplied from ozone generator in cooling water and maintains and sterilizes ozone concentration of a certain amount;

Copper ions and silver ions generated by electronic devices form electrostatic charges in negative cells formed in microorganisms and algae bacteria, causing reactions on the surface of microbial cells, preventing the formation of cell membranes. It is preferable to apply any one of the electronic silver-Copper ion purifier water treatment device which sterilizes as a function of neutralizing the survival of bacteria, but it can be applied to a plurality of water management devices of different types. have.

In addition, when the water quality management device is a forced drainage system, the automatic drainage valve and the supplemental water automatic valve (or float valve) are opened according to the detection signal of the cooling water quality detector so that the contaminated coolant is drained to the outside through the drainage automatic valve. At the same time, the replenishment water enters the sump through the replenishment automatic valve (or float valve) to relieve the concentration (or contamination) of the cooling water. Preferably, the drainage automatic valve and the supplementary water automatic valve further include an interlocking control such that an operation (ON / OFF) is interlocked.

The cooling water quality detector includes a pH detector for detecting the concentration of hydrogen ions in the cooling water, a conductivity detector for detecting the electrical conductivity of the cooling water, a chlorine detector for detecting residual chlorine in the cooling water, microorganisms and bacteria in the cooling water, and the like. It is preferable to be configured as one belonging to a bio detector for detecting and the like and adapted to the water management apparatus applied among these detectors.

Next, the water level controller is configured to compare and apply an alarm low water level detection signal of the water level detector input to the microcontroller unit and a coolant flow detection signal of the overflow detector with a control value and output the alarm control signal. It is preferable to further include a control configuration for operating the alarm means of.

The water-saving automatic valve is a water-saving means, and when the abnormal operation of the float valve (or the supplementary water automatic valve) for opening and closing the supplementary water supply to the water tank (remaining foreign matter in the valve seat or closing failure) In order to prevent loss of the coolant flowing into the flow pipe, it is preferable to be in the always open state unless the coolant flow detection signal of the overflow detector is generated, and to protect the valve in the always open state and to reduce power consumption. It is preferable that the automatic valve is closed when the power is supplied (ON) and opened when the operating power is turned off (OFF), but may also be applied to the automatic valve that is opened when the operating power is supplied (ON).

Here, the water-saving automatic valve may be applied to control the opening and closing according to the alarm high-level detection signal of the water level detector which replaces the coolant flow detection signal of the overflow detector, and further includes an alarm high-level detection unit (electrode, etc.). .

Next, the control unit includes a vibration detector for detecting abnormal vibration caused by disassembly of the cooling fan, breakage, external physical shock, and the like, and a vibration detection signal input to the microcontroller unit to be compared with a control value. And a vibration control unit which cuts off the power of the power switch of the cooling fan motor by an applied control signal and outputs the vibration control unit to operate the alarm unit.

Next, the control unit comprises a cooling water temperature detector provided in one region of the water collection tank, a cooling water flow detector provided in a cooling water inlet pipe (or an outlet pipe), and a heating heater for heating the cooling water in the water collection tank. The heating heater is operated by a control signal outputted by comparing and applying the heating heater operation control temperature (ht1) detection signal and the coolant flow detection signal (OFF) input to the microcontroller unit and the set control value. ON), the alarm low level detection signal (ON) of the water level detector input to the microcontroller unit, the heating heater stop control temperature (ht2) detection signal of the coolant temperature detector, and the coolant flow detection signal (ON) The operation of the heating heater is stopped (OFF) by one of a plurality of detection signals and a control signal output by comparing and applying the set control value. In addition, the heater may be configured to further include an anti-icing control unit that operates an alarm unit during abnormal operation (overheating or poor heating, etc.) and failure of the heating heater.

Here, the heating heater operation control temperature (ht1) is preferably set between 2 ℃ ~ 3 ℃, the heating heater stop control temperature (ht2) is preferably set between 4 ℃ ~ 5 ℃, heating heater The control temperatures ht1 and ht2 may be adjusted to the optimum temperature range according to the safety condition of the freezing prevention.

In addition, in the freezing prevention control unit, a freezing temperature season in which the air supply temperature ta1 'is maintained at 2 ° C. or lower and a normal temperature season in which the air supply temperature ta2' is maintained at 3 ° C. or higher are operated. It is preferable to further include an operation mode switching unit for switching the mode, the switching air supply temperature of the operation mode may be adjusted to the optimum temperature range according to the atmospheric temperature conditions such as the fluctuation range of the atmospheric temperature.

In addition, the operation mode switching unit is compared to the control temperature (ta1 'and ta2') detection signal of the air supply temperature detector input to the micro-control unit and the control value output by comparing and calculating the applied control signal to the cryometer and the room temperature meter It is preferred to be converted.

Here, when the operation mode switching unit is switched to the room temperature operation mode, the power of the icing prevention control unit and the heating heater is turned off (OFF), and when the operation mode switching unit is switched to the low temperature operating mode, the power of the icing control unit and the heating heater is open ( ON), the heating heater is turned on by the coolant control temperature (ht1) detection signal of the coolant temperature detector in the cryometer operating mode, and the alarm low level detection signal (ON) of the water level detector and the coolant temperature detector It is preferable to control the operation of the heating heater to be turned off by the detection signal ht2 and one of the detection signals of the cooling water flow detection signal ON of the cooling water flow detector.

In the anti-icing control unit, the sealed cooling tower for operating a heating heater for heating the cooling water in the collection tank in the cryogenic system operation mode, flows in the sealed heat exchange unit (closed heat pipe) due to abnormality of the cooling water circulation pump at sub-zero temperature. When the coolant stops circulation, the spray water pump is driven by the control signal output by comparing and applying the coolant detection signal (OFF) of the coolant flow detector input to the microcontroller unit and the set control value. It is preferable to further include a control configuration for preventing freezing by spraying on the surface of the part. In this case, when the coolant flowing in the sealed heat exchange part (closed heat pipe) is circulated according to the normal operation of the cooling water circulation pump, the microcontrol unit Cooling water detection signal (ON) of the input coolant flow detector and set control And comparison operation, and is preferably applied by stopping the spray pump by a control signal output.

Next, the control unit may further include a control power switch (electromagnetic switch, control power feeder, on / off lamp, etc.) for supplying and cutting off the operating power of various detectors and automatic valves in accordance with the control signal. The apparatus may further include a power supply means (motor control center or power control center) for supplying and cutting off driving power to a cooling fan motor, a sprinkling pump, a water quality control device, a heating heater, and the like according to a control signal.

Next, the control unit may further include an operation switching means (automatic / manual switching switch or the like) for switching between automatic control operation and manual control operation.

Next, the control unit is preferably composed of individual units, but may also be incorporated in a central control center of a building facility (or plant facility).

Next, the control unit further includes a control unit for cooling tower accessories (cooling water bypass device, smoke prevention device, fire protection device, etc.) that may be additionally installed later. In this case, even if the installation of additional control units, detectors and driving power supply means, and the control wiring between the control unit and the attachments and detectors are followed, the installation of additional control units is excluded. And additional equipment costs can also be reduced.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

Prior to the description, in the various embodiments, components having the same configuration will be representatively described in one embodiment by applying the same reference numerals, and in other embodiments, only the configuration different from the embodiment will be described.

1 is a schematic control configuration diagram of a cooling tower control unit according to the present invention, Figure 2 is a schematic configuration diagram of a cooling tower control system according to a first embodiment of the present invention, Figure 3 is an accessory and detector of Figure 2 4 is a schematic installation example, and FIGS. 4A and 4B are schematic control flowcharts of FIG. 2. As shown in these figures, a first embodiment of the present invention is a control system 2a of an open cooling tower 200a, which compares and applies an input detection and interlocking signal with a set control value to output a control signal. A microcontroller unit 10; And a control value input unit 20 for inputting and modifying operation control values and conditions, a signal input unit 30 for inputting detection and interlocking signals, and the signal input unit 30. A signal output unit 40 for comparing and inputting the signal inputted through the control value and outputting it as a control signal, a display unit 60 indicating the control value, the measured value and the operation control state, and a DC for which an AC voltage is required. A control unit (1) having a power supply unit (90) for supplying control power by dropping and rectifying with a voltage; Configured in the control unit (1); An interlocking control unit 100 for interlocking control of the cooling fan motor power switch 102 according to an operation (ON / OFF) signal input from the cooling water circulation pump starter 101 and an output control signal; From the control temperature detection signal input from the cooling water outlet temperature detector 121 provided at a predetermined position of the cooling tower 200a, the control temperature detection signal input from the cooling water inlet temperature detector 122, and the air supply temperature detector 125. A load control unit 120 for controlling the cooling fan motor 225 in a full load operation mode, a load load operation mode, and a natural cooling operation mode according to one or a plurality of control signals output from the input control temperature detection signal; Water quality control unit 130 for controlling the water quality management device 132 or 260 according to the detection signal and the control signal input from the cooling water quality detector 131 provided in one region of the collection tank 216 of the cooling tower (200a) and ; The alarm unit 70 is operated according to the alarm low water level detection signal and the control signal output from the water level detector 141 provided in one area of the water collecting tank 216, and is provided to the overflow pipe 245 of the cooling tower 200a. The cooling tower control system 2a including the water level control part 140 which controls opening and closing of the water-saving automatic valve 146 according to the detection signal input from the overflow detector 145 provided, and the output control signal is provided. .

Here, the control unit 1 includes a control computer (not shown) of the central control center or a distributed control computer (not shown) for controlling by control management area, and a remote control input / output unit 50 capable of remote control; The alarm unit 70 which operates the alarm means according to the alarm control signal outputted by comparing and calculating the alarm detection signal with the set control value, and basic control parameters are stored, and recognizes and stores the data of the control operation state in real time. In addition, the apparatus further includes an external storage unit 80 which is composed of Y pyrom which provides basic data on the power failure compensation control operation when the power is re-applied after power failure or artificial power off.

Next, the control unit 1 is installed at a predetermined position of the cooling fan 220, the vibration detector for detecting abnormal vibration caused by loosening, breakage, external physical shock, etc. of the cooling fan 220 assembly. The power supply of the cooling fan motor power switch 102 is cut off (OFF) by a control signal outputted by comparing and applying a vibration detection signal input from the 111 to the microcontroller unit 10 with a set control value, and It further comprises a vibration control unit 110 for operating the alarm unit 70 by the vibration detection signal.

Next, the load control unit 120 compares and applies the air supply temperature ta1 'detection signal of the air supply temperature detector 125 inputted to the microcontrol unit 10 to a control signal outputted by comparing with the set control value. Operation of the cryometer (for example, an atmospheric temperature of 2 ° C. or less) which is switched by the operation, and a comparison operation of the air supply temperature ta2 'detection signal of the air supply temperature detector 125 inputted to the microcontrol unit 10 with the set control value And an operation mode switching unit 127 for switching the room temperature (for example, an atmospheric temperature of 3 ° C. or higher) operation by the control signal applied and output.

Next, the control unit 2a is provided to the microcontroller unit 10 from a coolant temperature detector 151 provided in one region of the collection tank 216 in a low temperature system (at an atmospheric temperature of 2 ° C. or lower). Comparing and applying the input coolant control temperature ht1 detection signal to the set control value, the heating heater 270 installed in one region of the water collecting tank 216 is operated (ON) by the control signal output. Any one of the alarm low water level detection signal ON of the water level detector 141a, the control temperature ht2 detection signal of the coolant temperature detector 151, and the coolant flow detection signal ON of the coolant flow detector 152 is detected. The operation of the heating heater 270 is stopped (OFF) in response to a signal, and the freezing prevention control unit 150 operating the alarm unit 70 in case of abnormal operation (overheating or poor heating, etc.) and failure of the heating heater 270. It is prepared to include more.

Next, the water quality management apparatus is applied to the drain automatic valve 132 that opens and closes according to the detection signal of the coolant water quality detector 131 and drains the contaminated coolant at the same time as the supply of replenishment water. 3 to the water quality management device of any one of chemical input water quality management device, filtered water quality management device, ozone sterilization water quality management device, and electronic silver-copper ion sterilization device as shown by the dotted line in FIG. It can also be configured.

Next, although not shown in the drawings, the detector and the automatic valve include a power switch for opening and closing the operating power according to the interlocking signal or the control signal.

A schematic control operation for the cooling tower control system according to the present invention configured as described above will be described below with reference to FIGS. 2, 4A, and 4B.

Prior to the description, (ON) of the starter and the power switch is the same as operation, and (OFF) is the operation stop.

In addition, the detection signal from each detector and the interlocking signal of the coolant pump starter are inputted to the microcontrol unit 10, compared with the set control value, and outputted as a control signal. Although not described in detail, the control procedures of the microcontrol unit 10 are all applied.

First, when the control system is started, the interlocking control unit 100, the vibration control unit 110, the load control unit 120, the water quality control unit 130, the water level control unit 140, and the freezing prevention control unit 150 It is initialized to the set control value of the microcontrol unit 10 and is applied to the control operation mode.

Next, in the control operation of the interlocking control unit 100,

The interlocking control unit 100 is applied to the control operation mode (S10) and the cooling water circulation pump (not shown) for circulating the cooling water in accordance with the operating procedure of the refrigerator (not shown) or the cooling load equipment (not shown) In step S11, in which the coolant pump starter 101 is turned on, and the fan motor power switch 102 for driving the fan motor 225 according to the ON signal of the coolant pump starter 101 is turned on. Step S12 of operating the cooling fan motor 225 and the operating power of the cooling water outlet temperature detector 121 according to the (ON) signal of the cooling water pump starter 101 (S14); The fan motor power switch 102 for driving the fan motor 225 in accordance with the step S15 of turning off the coolant pump starter 101 and the (OFF) signal of the coolant pump starter 101 is turned off. The operation power of the cooling water outlet temperature detector 121 is turned off according to the step S16 of stopping the driving of the cooling fan motor 225 and the (OFF) signal of the cooling water pump starter 101. In step S18, the interlocking control is operated.

Here, the fan motor power switch 102 is controlled to be (OFF) when the temperature detection signal tw3 of the cooling water outlet temperature detector 121 is input even when the cooling water pump starter 101 is in the ON state.

In addition, the load control of the cooling tower 200a is effective only when the cooling water pump (not shown) is turned on, and the microcontroller may be operated from the cooling water outlet temperature detector 121 in the OFF state of the cooling water pump (not shown). The coolant pump starter 101 and the coolant outlet temperature are blocked in order to block unnecessary control for outputting a control signal by comparing and calculating and applying temperature detection signals tw1, tw2, and tw3 input to the controller unit 10 with the set control values. The interlocking control of the detector 121 is configured.

By the interlocking control operation, the ON and OFF switching operations of the fan motor power switch 102 and the cooling water outlet temperature detector 121 are performed according to the ON and OFF signals of the coolant pump starter 101. By controlling the cooling tower to be ON only during the operation (ON) of the refrigerator (or cooling load facility) is made possible to prevent the cooling tower from operating in a no-load state, which is scattered with the power energy of the cooling fan motor 225 Cooling water loss can be saved.

Next, in the control operation of the vibration control unit 110,

Cooling pump starter according to the step (S20) of applying the vibration control unit 110 in the control operation mode, the step (S21) of the vibration detection signal (ON) from the vibration detector 111, and the vibration detection signal (ON) The cooling fan motor 225 is driven by the step S22 of forcibly turning OFF 101 and the step S23 of turning OFF the fan motor power switch 102 according to the vibration detection signal ON. Is stopped.

Here, although not shown in the drawings, interlocking control in which the starter of the refrigerator or the cooling load facility is emergency stopped by the vibration detection signal ON may also be applied.

According to the step (S24) of the operator repairing and normalizing and resetting the element that caused the abnormal vibration (for example, breakage or loosening of the fan) of the cooling fan 220, and resetting the vibration The vibration detection signal is automatically turned off (S25), the vibration detection signal is turned off (OFF), and the cooling water pump starter 101 is turned on (S26), and the fan motor power switch 102 In step 27, the vibration control is operated.

By the vibration control operation, when abnormal vibration is generated in the cooling fan 220, the cooling water pump starter 101 and the fan motor power switch 102 are automatically turned off by the vibration detection signal ON (S21). Cooling fan 220 can be stopped safely, the driver can easily recognize through the alarm of abnormal vibration and take safety measures, vibration control is performed to switch to normal operation according to the application of the vibration after repair (reset).

Next, in the control operation of the load control unit 120,

In step S30, the load control unit 120 is applied to the control operation mode, and the initial load operation and the natural cooling operation mode are released (OFF) and the cooling fan motor 225 is full load operation (ON). A step S32 of inputting the control temperature detection signal tw2 from the cooling water outlet temperature detector 121 to the microcontroller unit 10 during the step S31 and the full load operation ON step S31; In step S33, the cooling fan motor 225 switches to the load-loading operation mode according to the control signal outputted by comparing and calculating and applying the control temperature detection signal tw2 to the set control value, and the full load operation and the natural cooling operation. The control temperature detection signal from the cooling water outlet temperature detector 121 during the step S34 in which the cooling fan motor 225 is deloaded (ON) and the deloading operation (ON) is released (OFF). (S3a) is inputted to the microcontroller unit 10, and the control temperature detection signal tw3 is set The cooling fan motor 225 switches to the natural cooling operation mode (S38) and releases the full load operation and the light load operation mode (OFF) according to the control value output by comparing with the value and applying and outputting the cooling fan motor. The control temperature detection signal tw1 is transmitted from the cooling water outlet temperature detector 121 during the step S39 in which the step 225 is spontaneously cooled (ON) and the control operation is repeated again. Is inputted in step S41 and the control temperature detection signal tw1 is compared with the set control value, and the control fan outputs the control signal and outputs the step of switching to the full load operation mode (S42). The load control is activated.

Although not shown in the drawings, the operation switching between the full load operation mode, the load reduction operation mode, and the natural cooling operation mode is detected by the microcontroller unit in order to ensure stability (determining the persistence of the detection temperature and preventing the rapid operation switching of the drive unit). From the time point at which the signal is input, the timer is switched after a time delay of 10 seconds, for example.

By such a load control operation, the cooling fan motor 225 operates at full load operation (100% of the cooling fan rated capacity), at reduced load operation (70% or less of the cooling fan rated capacity), and operation of natural cooling (cooling fan). The load control is performed in the step of stopping the motor (OFF), thereby saving the loss of cooling water scattered with the power energy of the cooling fan motor 225.

Next, in the control operation of the water quality control unit 130,

Step (S50) is applied to the water quality control unit 130 in the control operation mode, and the water quality control concentration detection signal (ON) from the cooling water quality detector 131 is input to the microcontroller unit 10 (S51) And operating the water quality management device 131 or 260 according to the control signal outputted by comparing and calculating and applying the water quality control concentration detection signal ON to the set control value (S52), and the water quality management device 131 or The water quality concentration is relaxed by the operation of the operation 260, the step S3 of turning off the water quality control concentration detection signal from the cooling water quality detector 131 (S3), and the water quality management device 131 or 260 as the detection signal is turned OFF. ), The water quality control is operated in step S54 in which the operation of.

Here, the power switch (not shown) of the water quality management device may be configured to further include an interlocking control step in conjunction with the coolant pump starter 101 for efficient water quality management of the cooling water (water quality management while circulating the cooling water). have.

And the water quality management device, the water quality management device consisting of an automatic drain valve 132,

Chemical dosing water quality management device to quantify the chemicals and to treat the water within the water quality management standards,

A side stream filtration water management device for filtering foreign substances while circulating contaminated cooling water;

Ozone sterilization type water quality management device which dissolves ozone (O₃) in cooling water to maintain and sterilize a certain amount of ozone concentration,

One of the electronic silver-copper ion purifier water management devices is applied, but may be applied to a plurality of water management devices of different types.

By such a water quality control operation, it is possible to prevent excessive concentration (or contamination) of circulating cooling water and lowering of heat exchange.

Next, in the control operation of the water level control unit 140,

The step S60 of applying the water level control unit 140 in the control operation mode, determining whether the overflow detection signal of the overflow detector 131 is OFF (S61), and the overflow detection signal OFF According to the step (S62) of opening the water-saving automatic valve 146 according to the (Open), and the float valve 235 in accordance with the opening (Open) of the water-saving automatic valve 146 to the water level change of the water collection tank (216) When the supplementary water is stopped and supplied to the water tank 216 due to the failure of the single water or the supplementary water supply means (saving water automatic valve and float valve), and the cooling water is reduced to the alarm low level, the water level detector ( The step S65 of turning on the alarm low water level detection signal (141), the step S66 of turning on the alarm unit 70 according to the alarm low level detection signal ON (S66), and supplementing the sump tank 216 Alarm level of the water level detector 141 when the water supply is normalized and the alarm low level is cleared (S67) that the above detection signal (OFF), the step (S68) that the alarm unit 70 (OFF) in accordance with the low alarm level detection signal (OFF), the failure of the float valve 235, etc. Supplying the replenishment water to the sump tank 216 so that the overflow detection signal of the overflow detector 131 is turned on when the coolant flows out through the overflow pipe 245 (S71); In response to the overflow detection signal ON, the alarm unit 70 is turned on (S72), and the water saving automatic valve 146 is closed (S73), and the float valve 235 is repaired. And the overflow detection signal is turned off (OFF) when the coolant flows out through the overflow pipe 245 by the normal operation (S74) and the overflow detection signal is turned off. In step S75 of turning OFF, the water level control is operated.

Here, the water-saving automatic valve 146 is closed by the detection signal ON of the overflow detector 145, but the control is closed according to the alarm high level detection signal ON of the water level detector 141. Can also be applied.

By such a water level control operation, the operator can easily recognize the water level fluctuation state by the coolant level alarm (alarm low level and high alarm level) in the sump and easily cope with it, and it is leaked to the outside due to the failure of the float valve 235 or the like. The loss of the cooling water can be prevented, and the cooling tower 200a in the shortage state of the cooling water can be prevented from operating.

Next, in the control operation of the freezing prevention control unit 150,

In step S80, the anti-icing control unit 150 is applied to the control operation mode, and the standby temperature is lowered in the room temperature operation mode so that the control temperature detection signal ta1 'is supplied from the air supply temperature detector 125 to the microcontroller unit. Step (S81) input to (10), the room temperature operating mode is released in accordance with the control temperature detection signal ta1 '(S82) to switch to the low temperature operating mode (S82), and control from the coolant temperature detector 151 A step S83a of inputting a temperature detection signal ht1 to the microcontroller unit 10 and a step of determining whether the alarm low water level detection signal of the water level detector 141 is OFF (S83b), and a coolant flow detector ( Step (S85) of determining whether the coolant flow detection signal of (152) is (OFF) and the step of heating heater power switch 270 (ON) following the control operation steps (S83a, S83b, S85) described above (S86). ), Determining whether the cooling water is heated (S87), and cooling Step (S88) of operating the fault alarm of the heating heater to the alarm unit 70 when the heating unit is not heated, and detecting the coolant flow of the cooling water flow detector 152 during the heating of the cooling water by the heating heater 280. When the signal (ON) (S91a), the control temperature detection signal ht2 of the coolant temperature detector 151 is activated (S91b), the alarm low water level detection signal of the water level detector 141 (ON) In step S92, the heating heater power switch 270 is turned off by one of the detection signals in step S91c, and the control temperature detection signal ta2 'of the air supply temperature detector 125 is determined. In step S95 and the step S96 of releasing the cryometer operating mode and switching to the room temperature operating mode according to the control temperature detection signal ta2 'of the air supply temperature detector 125, the frost prevention control is operated.

Here, the heating heater 280 may further include a control step of closing the replenishment water automatic valve 147 of the water quality control unit 130 to prevent waste of heating energy in the step of heating the cooling water.

In order to save the cooling water heating energy, the heating heater 280 is operated in a state where the cooling water flow detection signal of the cooling water flow detector 152 is turned off, and the cooling water flow detection signal is turned on. In the step (cooling water does not freeze during the flow), the heating heater 280 is stopped as described above as a preferred control example, but exposed to freezing in the cooling water system (water collection tank, cooling water supply and inlet pipe, cooling heat exchanger, etc.). In order to prevent the freezing of the coolant more safely from the heating heater, the heating heater 280 has a predetermined operating time set by the timer even when the coolant flow detection signal of the coolant flow detector 152 is turned on (for example, 1 hour). It may be configured to further include a control step that is intermittent (ON) in accordance with the operation and repeats in units of one hour stop).

 By the anti-freeze control operation, the heating heater is operated only in the low temperature operating mode, thereby preventing unnecessary operation of the heating heater in the room temperature thermometer, and controlling the heating heater not to operate in the low water level state. It is possible to prevent damage due to fire and overheating due to the operation of the heating heater in a deficient state, and the alarm low level detection signal ON of the water level detector 141 and abnormal operation of the heating heater 280 (overheating or poor heating). Etc.), the operator can easily recognize the abnormal operation state by the alarm to operate easily.

FIG. 5 is a schematic configuration diagram of a cooling tower control system according to a second embodiment of the present invention, FIG. 6 is a schematic diagram illustrating the installation of an accessory and a detector of FIG. 5, and FIG. 7A and 7B are schematic views of FIG. 5. Control operation flow chart. As shown in these figures, as the control system 2b of the hermetic cooling tower 200b, unlike the first embodiment described above, the coolant circulation pump starter is provided to the interlocking control unit 100 configured in the control unit 1. Further comprising a configuration for interlocking control the sprinkling pump power switch 103 in accordance with the operation (ON / OFF) signal input from the 101 and the output control signal,

In addition, the load control unit 120 controls (ON / OFF) to operate the sprinkling pump power switch 103 according to the control temperature detection signals (ta1, ta2) and the control signal output from the air supply temperature detector (125). Further comprises

In addition, the water level controller 140 further includes a control for opening and closing the supplementary water automatic valve 147 according to the low water level detection signal and the high water level detection signal and the control signal outputted from the water level detector 141. System 2b is provided.

Next, the anti-icing control unit 150, which is further included in the control unit 2a, detects the coolant flow provided in one region of the collection tank 216 in a low temperature meter (at an atmospheric temperature of 2 ° C or less) operation mode. The control unit further comprises a control for operating (ON / OFF) the watering pump power switch 103 according to the signal (ON / OFF) and the output control signal.

Next, although not shown in the drawings, the detector and the automatic valve include a power switch for opening and closing the operating power according to the interlocking signal or the control signal.

A schematic control operation for the cooling tower control system according to the present invention configured as described above will be described below with reference to FIGS. 5 and 7A and 7B.

Prior to the description, (ON) of the starter and the power switch is the same as operation, and (OFF) is the operation stop.

In addition, the detection signal from each detector and the interlocking signal of the coolant pump starter are input to the microcontrol unit 10, are compared with the set control value, and are outputted as control signals. Although not described in detail one by one, all of the control procedures of the microcontrol unit 10 is applied.

First, when the control system is started, the interlocking control unit 100, the vibration control unit 110, the load control unit 120, the water quality control unit 130, the water level control unit 140, and the freezing prevention control unit 150 It is initialized to the set control value of the microcontrol unit 10 and is applied to the control operation mode.

Next, in the control operation of the interlocking control unit 100,

The interlocking control unit 100 is applied to the control operation mode (S10) and the cooling water circulation pump (not shown) for circulating the cooling water in accordance with the operating procedure of the refrigerator (not shown) or the cooling load equipment (not shown) In step S11, in which the coolant pump starter 101 is turned on, and the fan motor power switch 102 for driving the fan motor 225 according to the ON signal of the coolant pump starter 101 is turned on. Operating the cooling fan motor 225 (S12) and the watering pump power switch 103 is turned on to operate the watering pump 250 (S13), the operating power of the cooling water outlet temperature detector 121 The fan for driving the fan motor 225 in accordance with the step (S14) that is (ON), the step (S15) that the coolant pump starter (101) (OFF), and the (OFF) signal of the coolant pump starter (101) The motor power switch 102 is turned off to stop the driving of the cooling fan motor 225 (S16) and the watering pump power switch 103 is turned off to stop the sprinkling pump 250. Is a linked control is operating in step (S17), the operating power (OFF) step (S18) that the cooling water outlet temperature sensor (121).

By the interlocking control operation, the fan motor power switch 102, the watering pump power switch 103, and the cooling water outlet temperature detector 121 according to the (ON) and (OFF) signals of the cooling water pump starter 101 ( ON) and (OFF) interlocking control is performed so that the cooling tower is ON only during the operation of the refrigerator (or cooling load facility), thereby preventing the cooling tower from operating under no load, and cooling fan motor ( It is possible to save the loss of cooling energy scattered with the power energy of 225).

Next, the control operation of the vibration control unit 110 is the same as the first embodiment described above.

Next, in the control operation of the load control unit 120,

In step S30, the load control unit 120 is applied to the control operation mode, and the initial load operation and the natural cooling operation mode are released (OFF) and the cooling fan motor 225 is full load operation (ON). In step S31 and the full load operation ON step S31, the detection signal tw2 is input to the microcontroller unit 10 from the cooling water outlet temperature detector 121, and the detection signal ( In step S33, the cooling fan motor 225 switches to the load-load operation mode according to the control signal outputted by comparing and applying tw2) with the set control value, and releasing the full load operation and the natural cooling operation mode (OFF). And a step (S34) in which the cooling fan motor 225 is load-loaded (ON) and a control temperature detection signal ta1 input from the air supply temperature detector 125 are compared with the set control value and applied and outputted. Step 36 of turning on the watering pump power switch 103 in accordance with the control signal, and the load operation (ON) step (S34) In step S37a of inputting the control temperature detection signal tw3 from the cooling water outlet temperature detector 121, and comparing the detection signal tw3 with a set control value and applying and outputting the control signal. A step (S38) of switching to a cooling operation mode and a step (S39) of releasing (OFF) the full load operation and the reduced load operation mode (S39) and naturally cooling the operation (ON) of the cooling fan motor, and the air supply temperature detector ( In operation S37b, the control temperature detection signal ta2 is inputted from 125, and the control temperature detection signal ta2 is compared with the set control value. (OFF) step (40), and as a repeating control operation, step (S41) of inputting the detection signal tw1 from the cooling water outlet temperature detector 121 during the natural cooling operation (ON) step (S32), Comparing and applying the control temperature detection signal tw1 with the set control value According to the control signal a cooling fan motor 225 is a load control is operating in step (S42) that is converted to a full-load operating mode.

Next, the control operation of the water quality control unit 130 is the same as the first embodiment described above.

Next, in the control operation of the water level control unit 140,

The step S60 of applying the water level control unit 140 in the control operation mode, determining whether the overflow detection signal of the overflow detector 131 is OFF (S61), and the overflow detection signal OFF (S62) of opening the water-saving automatic valve 146 according to the step S, a step S63 at which the low water level detection signal ON is input from the water level detector 141, and the low water level detection signal ON A step (S64) of opening the replenishing water automatic valve 147 according to a control signal outputted by comparing with the set control value and applying the output signal (S64), and the alarm low water level detection signal (ON) from the water level detector (141) And (S66) the alarm unit 70 (ON) according to the input step (S65), the control signal outputs by comparing and calculating and applying the alarm low water level detection signal (ON) to the set control value (S66), and the water tank The water level detector 141 when the supplementary water supply to the 216 is normalized and the alarm low water level is cleared. The alarm unit 70 is turned off according to the step S67 of inputting the alarm low water level detection signal OFF from the control signal and comparing and applying and outputting the alarm low water level detection signal OFF to the set control value. In step S68, the step S69 of inputting the high and low level detection signal ON from the level detector 141, and the control signal outputting a comparison operation and applying the high level detection signal OFF to the set control value In step S70 of closing the replenishing water automatic valve 147 and failure of the replenishing water automatic valve 147, the replenishment water supply is continued to the sump tank 216 and the overflow pipe 245 In operation S71, when the coolant flows to the outside via the overflow detection signal 131, the overflow detection signal ON is inputted, and the overflow detection signal ON is compared with the set control value and applied. The alarm unit 70 is turned on according to the control signal (S72) and closing the water-saving automatic valve 146 (S73) and the cooling water outflow through the overflow pipe 245 by the maintenance and normal operation of the refill water automatic valve 147 is stopped. When the overflow detection signal is turned off (S74), and when the overflow detection signal is turned off, the water level control is operated by turning off the alarm unit 70 (S75).

Next, in the control operation of the freezing prevention control unit 150,

In step S80, the anti-icing control unit 150 is applied to the control operation mode, and the standby temperature is lowered in the room temperature operation mode so that the control temperature detection signal ta1 'is supplied from the air supply temperature detector 125 to the microcontroller unit. Step (S81) input to (10), the room temperature operating mode is released in accordance with the control temperature detection signal ta1 '(S82) to switch to the low temperature operating mode (S82), and control from the coolant temperature detector 151 A step (S83a) of inputting the temperature detection signal ht1 to the microcontroller unit 10 and determining whether the alarm low water level detection signal of the water level detector 141 is OFF (S83b), and the control described above. After the operation steps S83a and S83b, the heating heater power switch 270 is turned on (S86), determining whether the cooling water is heated (S87), and the alarm unit 70 when the cooling water is not heated. Step (S88) of operating (ON) the failure alarm of the heating heater, Determining whether the cooling water flow detection signal of the cooling water flow detector 152 is turned off (S89) during heating of the cooling water by a heating heater (280), and the spraying pump as the cooling water flow detection signal is turned off (S). (90) turning on the power switch 103, step (S91b) in which the control temperature detection signal ht2 of the coolant temperature detector 151 is operated, and the alarm low water level detection signal of the water level detector 141 (S92) in which the heating heater power switch 270 is turned off in accordance with a control signal for comparing and calculating and applying the detection signal of any one of the steps S91c to which the control signal is set to ON. A step S93 of turning on the coolant flow detection signal of the coolant flow detector 152 (ON), a step of determining a control temperature detection signal ta2 'of the air supply temperature detector 125 (S95), and a flow detection Step (S94) of turning off the sprinkling pump power switch 103 in accordance with the signal (ON) And a step (S95) of inputting the control temperature detection signal ta2 'of the air supply temperature detector 125, and canceling the cryometer operation mode according to the control temperature detection signal ta2' and switching to the room temperature operation mode. In step S96, the frost control is operated.

Although not described in detail in the above-described embodiments and drawings, the coolant flow rate input from the coolant flow rate detector, the air supply wet bulb temperature input from the air supply temperature detector, the coolant outlet temperature input from the coolant outlet temperature detector, and the coolant inlet temperature The operation value of the cooling water inlet temperature input from the detector may be calculated to further include an operation efficiency integration unit having an operation efficiency integration and a display function representing the operation efficiency of the cooling tower in real time.

Although not described in detail in the above-described embodiments and drawings, the control unit includes main components (for example, heat exchange unit, fan unit, eliminator, water collection tank, watering device, watering pump, cooling water heating heater, water quality management device). , Each detector, each automatic valve, etc.) Input function of maintenance (inspection, repair or replacement) schedule and maintenance execution (date and time), and cumulative counting of operation time by update of maintenance by component It may be configured to further include a maintenance example having a display function for notifying the maintenance date and time, and the recording of the maintenance content by the maintenance schedule and the cumulative counting of the operation time.

As described above, preferred embodiments of the present invention have been described based on the accompanying drawings. However, the present invention, because the present invention can be applied in a variety of industries, the scope of the present invention is not limited to the above embodiments, it will be limited only by the contents described in the claims to be described later.

According to the present invention, the power energy can be saved by controlling the full load, the reduced load and the natural cooling operation mode of the cooling fan motor according to the cooling load fluctuation, and the water loss can be prevented by controlling the overflow loss of the cooling water. In addition, it is possible to easily apply the control unit of the cooling tower accessories added later, if necessary, provides a cooling tower control system that can improve the efficiency of the cooling tower and the control of the accessories and reduce the cost.

Claims (12)

In a cooling tower control system, A microcontroller unit which compares and applies an input detection and interlocking signal with a set control value and outputs a control signal; Comprising the microcontroller unit, the control value input unit for inputting and modifying the operation control value and the condition, the signal input unit for inputting the detection and interlocking signal, the comparison and operation of the signal input through the signal input unit with the control value A control unit having a signal output unit for outputting a control signal, a display unit for indicating the control value, the measured value and the operation control state, and a power supply unit for supplying control power by dropping and rectifying an AC voltage to a required DC voltage; ; Configured in the control unit; An interlock control unit for interlocking and controlling the cooling fan motor power switch according to an operation (ON / OFF) signal input from the coolant circulation pump starter and an interlock control signal output; One or more of a control temperature detection signal input from a coolant outlet temperature detector provided at a predetermined position of the cooling tower, a control temperature detection signal input from a coolant inlet temperature detector, and a control temperature detection signal input from an air supply temperature detector. A load control unit controlling the cooling fan motor in a full load operation mode, a load load operation mode, and a natural cooling operation mode according to the output load control signal; A water quality control unit controlling a water quality management device according to a water quality detection signal inputted from a coolant water quality detector provided in one area of a collection tank of the cooling tower and an output water quality control signal; The opening and closing of the supplementary water supply means is controlled according to the water level detection signal input from the water level detector provided in one area of the collection tank of the cooling tower and the output water level control signal, and is input from the overflow detector provided in the overflow pipe of the cooling tower. Cooling tower control system comprising a water level control unit for controlling the opening and closing of the water-saving automatic valve in accordance with the overflow detection signal and the overflow control signal output. The method of claim 1, The control unit, the cooling tower control system further comprises an alarm unit for operating the alarm means in accordance with the alarm detection signal and the alarm control signal output to the microcontrol unit. The method of claim 1, The control unit includes a basic control parameter, and comprises an EPyrom which recognizes and stores data of a control operation state in real time, and provides basic data on a power failure compensation control operation upon re-applying after power failure or artificial power off. With external storage, Cooling tower control system further comprises a remote control data input and output unit capable of remote control. The method of claim 1, The interlocking control unit, the cooling tower control system further comprises the control of the sprinkling pump interlocked according to the operation (ON / OFF) signal input from the coolant circulation pump starter and the output control signal. The method of claim 1, The control unit compares and applies a vibration detection signal input from a vibration detector that detects abnormal vibration caused by disassembly, breakage of the cooling fan, external physical shock, etc. to a control value, and outputs the control signal. Cooling tower control system further comprises a vibration control unit for shutting off (OFF) the power of the cooling fan motor by operating the alarm unit. The method of claim 1, The load control unit may further include a sprinkling pump control unit which is operated (ON / OFF) according to a control signal outputted by comparing and applying a control temperature detection signal input from the air supply temperature detector with a set control value. Cooling tower control system. The method of claim 1, The load control unit, the cooling tower control system, characterized in that it further comprises an operation mode switching unit for switching between the room temperature operating mode and the low temperature operating mode in accordance with the supply air temperature fluctuations. The method of claim 1, The water quality management device, the water quality management device consisting of a water quality management device consisting of a drainage automatic valve, a chemical water treatment device for the water treatment chemicals input water treatment chemicals, and the ozone water treatment device for the water treatment by adding ozone. Cooling tower control system, characterized in that consisting of any one of the water quality management device consisting of a device, an electronic silver-copper ion sterilizer. The method of claim 1, And said water-saving automatic valve is closed by one of a cooling water flow detection signal of said overflow detector and an alarm high water level detection signal of said water level detector. The method of claim 1, In the control unit, the catchment tank is compared with a set control value by applying a coolant control temperature (ht1) detection signal input from a coolant temperature detector provided in one region of the catchment tank in a low temperature operating mode, and applying the control signal to the catchment unit. A heating heater installed in one region is turned on, and an alarm low level detection signal input from the water level detector, a control temperature (ht2) detection signal input from the coolant temperature detector, and a coolant flow detector are input. The operation of the heating heater is stopped (OFF) according to any one of the coolant flow detection signals (ON), and the freezing prevention of operating the alarm unit in case of abnormal operation (overheating or poor heating) and failure of the heating heater. Cooling tower control system further comprising a control unit. The method of claim 1, The control unit includes a coolant flow rate input from a coolant flow rate detector, an air supply wet bulb temperature input from an air supply temperature detector, a coolant outlet temperature input from a coolant outlet temperature detector, and a coolant inlet temperature input from a coolant inlet temperature detector. Cooling tower control system characterized in that it further comprises a driving efficiency integration unit having an operation efficiency integration and display function for calculating the operating efficiency of the cooling tower in real time by calculating a value. The method of claim 1, The control unit includes an input function of maintenance (check, repair or replace) for each major component and a maintenance (period and contents) matter, a cumulative counting of operation time at an update point of maintenance of each component, Cooling tower control system characterized in that it further comprises a maintenance example having a display function for notifying the date and time of maintenance by the cumulative integration counting of the maintenance schedule and operation time, and the recording of the maintenance content.

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