JP5554600B2 - Cooling tower chemical injection device - Google Patents

Description

  The present invention relates to a chemical injection device for a cooling tower, and more particularly to a chemical injection device for a cooling tower that injects chemicals such as a scale inhibitor, a rust inhibitor, and a slime control agent into the circulating water of the cooling tower.

  Conventionally, in an open circulating cooling water system for industrial use or air conditioning, a cooling tower is widely used as a means for cooling and circulating water whose temperature has been raised by heat exchange with a heat exchanger such as a refrigerator.

  In the open circulation cooling water system using the cooling tower, water is circulated and used, so that water is concentrated by evaporation, and scale failure, corrosion failure, and slime failure are likely to occur. In order to prevent these obstacles, water treatment chemicals (hereinafter referred to as “chemicals”) such as scale inhibitors, rust inhibitors, and slime control agents are added to the cooling water system. In this chemical addition, it is common to employ a method in which a chemical is injected into the lower water tank of the cooling tower by a dedicated chemical injection device installed in the vicinity of the cooling tower.

  Addition of these drugs does not exhibit a sufficient effect as a drug unless the concentration is constantly maintained at a certain level or higher. Therefore, as a method for injecting a medicine by the medicine injecting apparatus, a timer control system in which a constant amount of medicine is injected at a fixed time or every certain time elapses is often adopted.

  However, when injecting chemicals by the timer control method, if the chemicals are injected by the timer control method regardless of the operation status of the cooling tower, there is a situation in which the chemical is injected even when the cooling tower is stopped. In such a case, the drug is excessively injected beyond the required drug concentration. However, the excessive injection of the drug is economically wasteful and may be harmful.

  Therefore, when the timer control method is adopted as the medicine injection operation, it is desirable to link the operation of the medicine injection pump with the operation status of the cooling water circulation pump in the cooling tower. Specifically, when the cooling water circulating pump in the cooling tower is in operation, the chemical injection pump is controlled by the timer control method, and the cooling water circulating pump in the cooling tower is in a stopped state. Does not operate the drug injection pump.

  In order to realize this, conventionally, the operation signal of the cooling tower is taken out from the on / off signal of the circulating pump for cooling water, and the control operation by the timer control method of the drug injection pump is performed while interlocking with the on / off signal. It was.

  However, generally, the cooling tower is installed on the roof of a building or a building, and in many cases, a drug injection device including a drug injection pump is arranged in the vicinity thereof. On the other hand, a circulating pump for cooling water that circulates and transports cooling water (hereinafter referred to as “circulated water”) is often arranged in a central or underground machine room. Therefore, if an on / off signal of the circulating pump for cooling water is sent to the control panel of the drug injection pump, it is necessary to draw the wiring from the center or basement machine room that is separated from the floor to the roof. In addition to the increase in length, a failure often appears in the middle of wiring, which requires a great deal of cost and labor.

  From this point of view, conventionally, a float sensor is attached to the bottom of the sprinkler plate of the cooling tower, the water level of the circulating water is detected by the float sensor, and the operation of the drug injection pump is controlled by the detection signal. An apparatus has been proposed (see, for example, Patent Document 1).

  In the cooling tower chemical injection device described in Patent Document 1, when the cooling water circulation pump is operating, the circulating water accumulates on the water spray plate, the float floats, and the cooling water circulation pump stops and the water spray plate is stopped. The movement of falling float due to the absence of circulating water is taken out as a float sensor signal. When the cooling water circulation pump is operating, the medicine injection pump performs a predetermined control operation, and the cooling water circulation pump In this case, the medicine injection pump is controlled not to be operated when is stopped.

Japanese Patent No. 3675180.

  However, in the medicine injection device using the conventional float sensor, when the circulating pump for cooling water is in operation, the circulating water is sprinkled on the sprinkler plate in the horizontal direction, so it circulates on the sprinkler plate. Water is a fast horizontal stream. For this reason, there has been a problem that the float of the sensor is strongly pressed from the side (horizontal direction) against the slide member that is slidably held in the vertical direction and does not lift up, often resulting in malfunction.

In addition, in recent years, the tendency to pursue efficient operation of cooling towers from the viewpoint of resource saving and energy saving has become stronger, and a method of adjusting the amount of circulating water with an inverter etc. according to the load has been increasingly adopted. It was. In an open circulating cooling water system that adjusts the circulating water volume using this inverter method, the circulating water volume decreases as the load decreases, so the water level on the water spray plate is lower than during normal operation. Will do.
For this reason, in the conventional water level detection method using the float sensor, when the load is reduced, the water level does not rise to the threshold height, so that an erroneous operation state is detected, and there is often a problem that a malfunction occurs.

  Therefore, even if the water flow on the water spray plate is fast, or even if the circulating water volume decreases in response to a decrease in the load, as in an open circulating cooling water system that adjusts the water volume using an inverter system, the sensor will not malfunction. There is a technical problem to be solved in order to detect the accurate operating state of the cooling tower and to reliably control the drug injection pump, and the present invention solves this problem. Objective.

The present invention has been proposed to achieve the above object, and the invention according to claim 1 provides the circulating water to be cooled from the water sprinkling holes provided on the filler of the cooling tower and opened at the bottom. Sprinkling plate flowing down into the gap between the fillers, a detector for detecting the circulating water supplied on the sprinkling plate, and a drug injection in a cooling tower comprising a pump for drug injection controlled by a detection signal of the detector In the device
The detector is a water receiving tank that receives and stores a part of circulating water from a water supply port supplied on the watering plate, and has a drain hole for discharging water in the water receiving tank in the vicinity of the bottom thereof. a receiving tank having to detect the presence or absence of the circulating water contained in the receiving water tank comprises a sensor for outputting the detection signal, that receiving water tank is not arranged on the sprinkler plate cooling A tower drug injection device is provided.

  According to this configuration, when the circulating pump for cooling water is operated and the circulating water is supplied onto the water spray plate, a part of the circulating water supplied onto the water spray plate is sequentially accommodated in the water receiving tank of the detector. . In this way, when a part of the circulating water is accommodated in the water receiving tank, even if a fast water flow is generated on the water spray plate, the generation of a strong horizontal water flow is prevented in the water receiving tank. It is possible to prevent malfunction of the float sensor. Also, when the cooling water circulation pump is driven by an inverter system, even if the amount of circulating water supplied on the water spray plate is reduced in response to the load reduction, the cooling water is accommodated in the water receiving tank. The circulating water level can be raised as it is without decreasing and kept above the threshold height.

  On the other hand, when the operation of the cooling water circulation pump stops, the circulating water is not supplied to the water receiving tank of the detector, and the circulating water contained in the water receiving tank is only discharged from the drain hole, and eventually the water level is reduced. It becomes possible to detect that the operation of the cooling tower is stopped. Therefore, it can be used for an open circulation cooling water system in which the amount of water is adjusted by an inverter method.

  According to a second aspect of the present invention, in the configuration according to the first aspect, the water receiving tank provides a medicine injection device for a cooling tower having an opening degree adjusting means for adjusting an opening degree of the drain hole.

  According to this configuration, for example, when the cooling water circulation pump is driven by the inverter system, the drain hole is previously provided so that the circulating water is accumulated in the water receiving tank even when the load of the cooling water circulation pump is minimum. If the opening degree is adjusted, even if the supply amount of the circulating water decreases in response to the decrease in load, the water level in the water receiving tank can be raised to a threshold height or higher to maintain the necessary water level.

  According to a third aspect of the present invention, in the configuration according to the first or second aspect, when the water tank has a water level exceeding a certain height, the stored circulating water flows out from a specific portion of the water tank to the outside. A cooling tower chemical injection device characterized by having a water discharge portion for forming a water flow in a certain direction in the water receiving tank.

  According to this configuration, when the level of the circulating water stored in the water receiving tank exceeds a certain level, the circulating water in the water receiving tank flows out of the water receiving tank through the water discharge part, and enters the water receiving tank in a certain direction. Since a gentle water flow is formed, the operation status of the cooling tower can be detected even if a sensor for detecting the water flow is used.

  The invention described in claim 4 is the float sensor according to claim 1, 2 or 3, wherein the detection sensor includes a float that moves up and down together with the water level in the water tank, and extracts the movement of the float as a signal. A cooling tower drug injection device is provided.

  According to this configuration, when the circulating pump for cooling water is operated and the circulating water accumulated in the water tank reaches a certain level, the float of the float sensor floats up, for example, the reed switch is turned from on to off (or from off to on). Thus, the movement of the float can be taken out as a detection signal, and the operation state of the cooling tower can be determined based on this detection signal.

  According to a fifth aspect of the present invention, in the configuration according to the first, second, or third aspect, the detection sensor includes a pair of electrodes that measure a water level in the water tank by an electric resistance value, and the pair of electrodes A cooling tower drug injection device, which is an electrode-type sensor that takes out the measurement value detected in step 1 as a signal, is provided.

  According to this configuration, when the circulating pump for cooling water is operated and the circulating water accumulated in the water tank reaches a certain water level, the pair of electrodes of the electrode type sensor is conducted and the electric resistance value changes. The obtained measurement value is taken out as a detection signal, and the operation state of the cooling tower can be determined with this detection signal.

  According to a sixth aspect of the present invention, in the configuration according to the third aspect, the detection sensor includes a switch that can be switched on and off, and an actuator that controls switching of the switch on and off. There is provided a medicine injection device for a cooling tower which is immersed in the water flow of the circulating water and is attached so as to be rotatable in the water flow direction.

  According to this configuration, when the cooling water circulation pump is operated and a gentle flow of the circulating water is formed in the water receiving tank, the actuator is rotated in the water flow direction by the flow of the circulating water and the switch is turned on. The operation state of the cooling tower can be determined with this detection signal.

  A seventh aspect of the present invention is the configuration according to the third aspect, wherein the detection sensor includes a water turbine having a plurality of blades rotating by sequentially immersing a tip portion in the water flow of the circulating water, and the water turbine. A cooling tower chemical injection device including a generator that rotates to generate electric power is provided.

  According to this configuration, when the circulating pump for cooling water is operated and a gentle flow of circulating water is formed in the water receiving tank, the turbine is rotated by the flow of the circulating water and at the same time the power is detected from the generator. Is generated as Therefore, the operation state of the cooling tower can be determined from the detection signal (electric power) output from the generator.

  According to the first aspect of the present invention, when the circulating pump for cooling water is operated and the circulating water is supplied onto the water spray plate, a part of the circulating water supplied onto the water spray plate is sequentially accommodated in the water receiving tank of the detector. Is done. In this way, when a part of the circulating water is accommodated in the water receiving tank, even if a fast water flow is generated on the water spray plate, the generation of a strong horizontal water flow is prevented in the water receiving tank. It is possible to prevent malfunction of the float sensor. Also, when the cooling water circulation pump is driven by an inverter system, even if the amount of circulating water supplied on the water spray plate is reduced in response to the load reduction, the cooling water is accommodated in the water receiving tank. The circulating water level can be raised as it is without decreasing and kept above the threshold height.

  On the other hand, when the operation of the cooling water circulation pump stops, the circulating water is not supplied to the water receiving tank of the detector, and the circulating water contained in the water receiving tank is only discharged from the drain hole, and eventually the water level is reduced. It becomes possible to detect that the operation of the cooling tower is stopped. Therefore, it can be used for an open circulation cooling water system in which the amount of water is adjusted by an inverter method.

  According to the second aspect of the present invention, in the case where the cooling water circulation pump is driven by the inverter system, the drainage hole is previously provided so that the circulating water is accumulated in the water receiving tank even when the load of the cooling water circulation pump is minimum. By adjusting the opening of the tank, even if the amount of circulating water decreases in response to a decrease in load, the water level in the water receiving tank can be raised above the threshold height to maintain the required water level. In addition to the effect of the invention described in claim 1, it is possible to more accurately determine the operating state of the cooling tower and drive / stop the drug injection pump more reliably, and further improve the reliability. Can be expected.

  When the invention according to claim 3 has a water discharge portion that forms a water flow in a certain direction, the circulating water in the water receiving tank is drained only from the specific water discharge portion, and a water flow in a certain direction is reliably formed. Therefore, in addition to the effects of the first or second aspect of the invention, the operation state of the cooling tower can be detected using a sensor that detects the water flow.

  According to the invention described in claim 3, the present invention can be applied to various types of sensors that can detect the presence or absence of circulating water in the water receiving tank.

  For example, various sensors according to claims 4 to 7 can be cited as sensors capable of detecting the presence or absence of circulating water in the water receiving tank.

The sensor for detecting the water level according to claims 4 and 5 is preferably used in the inventions according to claims 1 and 2, and the sensor for detecting the water flow according to claims 6 and 7 is used. It is suitable for use in the invention according to claim 3.

  By using the sensors described in claims 4 to 7, it is possible to detect the presence or absence of circulating water in the water receiving tank with higher reliability and more accurately determine the operating state of the circulating pump for cooling water. It will be possible.

The top view of the cooling tower shown as one Embodiment of this invention. The general | schematic whole block diagram which shows a cross section along the AA line of FIG. 1 and shows a cooling tower same as the above. The principal part expanded sectional view of the detector in a cooling tower same as the above. The perspective view of a detector same as the above shown in FIG. The perspective view which shows another Example of the detection sensor used with the detector of a cooling tower same as the above. The perspective view which shows another Example of the detector in a cooling tower same as the above. The perspective view which partially breaks and shows the Example of the water flow detection type detection sensor used with the detector of a cooling tower same as the above. BB cross-sectional view of FIG. The perspective view which shows another Example of the water flow detection type detection sensor used with the detector of a cooling tower same as the above.

  The present invention provides a water spray plate that is provided on a filler of a cooling tower and that circulates water to be cooled from a water spray hole formed in a bottom portion into a gap of the filler, and the circulation supplied on the water spray plate. In a drug injection device of a cooling tower provided with a detector for detecting water and a drug injection pump controlled by a detection signal of the detector, the detector is one of the pre-circulated water supplied on the watering plate. A water receiving tank that receives and accommodates a portion of the water receiving tank having a drain hole for discharging water in the water receiving tank in the vicinity of the bottom of the water receiving tank, and the level or flow of the circulating water stored in the water receiving tank. This is realized by providing a detection sensor that detects and outputs the detection signal.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a medicine injection device for a cooling tower according to the invention will be described with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment.

  1 and 2, a cooling tower 10 is a cooling tower that sucks outside air into a central air chamber 11 from two directions on the left and right sides, and is usually provided on a rooftop of a building or the like for circulating cooling water. Yes. The air chamber 11 extends in the vertical direction, and an exhaust port 12 is provided at an upper portion, and an exhaust fan 13 is attached to the exhaust port 12. On the left and right sides of the exhaust port 12, there are provided dish-shaped water spray plates 15, 15 having a large number of water spray holes 14, 14... At the bottom, and under each water spray plate 15, 15 a filler 16. Is arranged. A louver 17 is provided outside the filler 16 as an outside air intake.

  Each of the water spray plates 15 and 15 is made of glass fiber reinforced polyester, serves also as an upper water storage tank, and has a water supply port 18a of a circulation line 18 for supplying circulating water pumped up by a cooling water circulation pump P to the front and rear central portions. Is arranged. The water supply port 18a of the circulation line 18 is opened upward, and the water supply port 18a has a substantially dish-like shape that receives the circulating water ejected from the water supply port 18a and directs it downward. The water receiving plate 25 is disposed upside down and in a horizontal state as shown in FIG. Further, a water receiving tank 27 of a detector 26 to be described later is disposed at a position on the water spray plates 15, 15 below the water receiving plate 25 so as to partially overlap the water receiving plate 25. ing. In addition, the detector 26 may be provided only in any one of each watering board 15 and 15.

  Then, the circulating water heated by the refrigerator 19 is sent to the circulation line 18 by the cooling water circulation pump P, and is directed from the water supply ports 18a, 18a provided in the circulation line 18 to the water receiving plates 25, 25. It is blown out and spreads in the horizontal direction when it hits the water receiving plates 25, 25, and a part is dropped and accommodated in the water receiving tank 27 of the detector 26, and the rest all falls on the watering plates 15, 15. And spread horizontally.

  The circulating water that has spread on the water spray plates 15, 15 is sprinkled on the fillers 16, 16 from the water spray plates 15, 15 through the water spray holes 14, 14, and then the gaps between the fillers 16, 16. Is collected in a lower water tank 20 provided at the lower part of the cooling tower 10.

  On the other hand, when the exhaust fan 13 provided at the exhaust port 12 at the upper part of the air chamber 11 is operated, the outside air flows from the louver 17 across the gap of the filler 16 into the air chamber 11 and rises up the air chamber 11. It is discharged from the exhaust port 12.

  In this way, in the cooling tower 10, the outside air that crosses the gap between the fillers 16 and the circulating water that flows down through the gaps between the fillers 16 contact each other in an orthogonal state, whereby a part of the circulating water evaporates and circulates by the heat of vaporization. The water will be cooled. And the cooled circulating water gathers in the lower water tank 20, is supplied to the refrigerator 19 from this lower water tank 20, and cools. Further, the circulating water heated by cooling is supplied again to the watering plates 15 and 15 of the cooling tower 10 and circulates.

  During the operation of the cooling tower 10, the water is ejected from the water supply ports 18 a, 18 a toward the water receiving plates 25, 25, hits the water receiving plates 25, 25, and is dropped and accommodated in the water receiving tank 27 of the detector 26. The circulating water is detected by a detection sensor 28 provided in the detector 26 as described later.

  On the other hand, when the operation of the cooling tower 10 is stopped and the circulating water is not circulated, the supply of the circulating water from the water supply port 18a is stopped, and the circulating water accumulated on the water spray plates 15 and 15 is sprinkled through the holes 14 and 14. ... flows down to the filler 16 through the water level and disappears.

  Here, in a normal case, on the roof of the building where the cooling tower 10 is installed, a chemical tank 21 and chemicals in the chemical tank 21 (a scale inhibitor, a rust preventive agent, a slime control) are located beside the cooling tower 10. A drug injection pump 22 for injecting the drug into the lower water tank 20 and a drug injection device 24 including a liquid supply pipe 23 are provided.

  The medicine injection device 24 controls the operation of the medicine injection pump 22 during operation of the cooling tower 10, and in this embodiment, the medicine injection device 24 is ejected from the water supply ports 18a, 18a toward the water receiving plates 25, 25, The driving of the medicine injection pump 22 is controlled by using the circulating water which falls on and falls in the water receiving tank 27 of the detector 26 when it hits the water receiving plates 25, 25.

  3 and 4 show an embodiment of the detector 26 in more detail. FIG. 3 is an enlarged cross-sectional view of the main part of the detector 26, and FIG. 4 is a perspective view of the detector 26. 3 and 4, the detector 26 includes the water receiving tank 27 and a detection sensor 28 that determines the operation state of the cooling tower 10 from the circulating water dropped and accommodated in the water receiving tank 27.

  The water receiving tank 27 is a substantially rectangular box having an upper surface opened, and a drain hole 30 is provided in the front side wall 27a at a position close to the bottom wall 27c. The drain hole 30 is provided with a drain pipe 33 provided with a ball valve 32 as an opening degree adjusting means that can adjust the amount of water drained from the drain hole 30 on the way. The ball valve 32 is always configured to drain the circulating water from the water receiving tank 27 in order to prevent the float sensor 35 from floating in the water receiving tank 27 when the cooling water circulation pump is stopped. "Open".

  However, the opening degree of the ball valve 32 is set so that the circulating water is accumulated in the water receiving tank 27 even when the cooling water circulation pump P is at a minimum load when the cooling water circulation pump P is driven by an inverter system. Even if the supply amount of the circulating water is reduced in accordance with the decrease in the load, the water level in the water receiving tank 27 can be raised to the threshold level or higher to maintain the necessary water level.

  And the said water receiving tank 27 is arrange | positioned on the water spraying board 15 so that a part by the side of the rear side wall 27b may be located just under the said water receiving plate 25, and it is from the water supply port 18a by the driving | operation of the cooling tower 10. A part of the circulating water which is ejected and falls upon hitting the water receiving plate 25 can be received and accommodated.

  The detection sensor 28 is a float type detection sensor, and includes a sensor holding frame 34 and a float sensor 35. The sensor holding frame 34 is formed in a substantially downward U-shaped cross section, and has attachment pieces 34 a and 34 a provided on the upper surface of the water receiving tank 27 so as to straddle the upper surface of the water receiving tank 27. The left and right attachment pieces 27d and 27d are attached via bolts and nuts 36, respectively. Further, a long hole 37 for attaching a cylinder is provided on the upper surface of the sensor holding frame 34.

  The float sensor 35 passes through the long hole 37 for mounting the cylinder and the upper part is fixed to the sensor holding frame 34 by two upper and lower fixing brackets 38a and 38b, and the sensor holding frame 34 is directed straight downward from the upper surface. A cylindrical body 39 attached in a suspended state, and a float 40 fitted to the outer periphery of the cylindrical body 39 so as to be slidable in the vertical direction are provided. A stopper 41 that restricts the downward movement of the float 40 is attached to the lower end of the cylindrical body 39. Furthermore, the cylinder 39 has a built-in reed switch, and the float 40 has a built-in permanent magnet.

  The float sensor 35 configured as described above is attached to the sensor holding frame 34 so that the float 40 is immersed in the water in the water receiving tank 27. When the water level in the water receiving tank 27 rises, the float 40 rises. When the water level rises to the threshold value, the reed switch in the cylinder 39 is turned on. When the water level decreases below the threshold value and the float 40 descends, the reed switch is turned off. It is comprised so that it may become.

  Therefore, when the operation of the cooling tower 10 is started, the circulating water is ejected from the water supply port 18 a of the circulation line 18, hits the water receiving plate 25 and falls into the water receiving tank 27, and the circulating water is accumulated in the water receiving tank 27. As a result, when the water level in the water receiving tank 27 increases, the float 40 starts to rise, and when it rises to the threshold value, the reed switch in the cylinder 39 is turned on. On the other hand, when the operation of the cooling tower 10 is stopped, the cooling water circulation pump P is also stopped, and when the supply of the circulating water to the water receiving tank 27 is stopped, the water receiving tank 27 is connected via the ball valve 32. Only the circulating water is discharged from the drainage, and eventually the circulating water in the water receiving tank 27 disappears. As a result, the float 40 is lowered and the reed switch is turned off. Therefore, the drug injection device 24 can determine the operating state of the cooling tower 10 using the detection signal from the float sensor 35 and control the drive of the drug injection pump 22 of the drug injection device 24 as intended. It becomes possible.

And like this detector 26, when a part of circulating water is accumulated in the water receiving tank 27 and a detection signal is obtained from the water level in the water receiving tank 27, the circulating pump P for cooling water is switched by, for example, an inverter system. In such a case, the opening degree of the ball valve 32 is adjusted in advance so that the circulating water is accumulated in the water receiving tank 27 even when the load of the cooling water circulation pump P is minimum, so that the load is reduced. Correspondingly, even if the amount of circulating water supplied onto the water spray plate 15 is reduced, the level of the circulating water stored in the water receiving tank 27 can be raised as it is and kept above the threshold height without decreasing. . Therefore, a remarkable effect is obtained in an open circulation cooling water system that adjusts the amount of water by an inverter method.

  FIG. 5 shows another embodiment of the detection sensor 28 used in the detector 26. This detection sensor 28 is an electrode type water level detection sensor, and is attached to the sensor unit 43 having a pair of electrodes 41, 42, a fixing unit 44 for fixing the sensor unit 43, and the fixing unit 44, and And a cover 45 that houses the sensor unit 43 in an internal space 47.

  More specifically, in the sensor unit 43, the first electrode 41 and the second electrode 42 for measuring the electrical resistance value are disposed apart from each other. The first electrode 41 is connected to a circuit in a control device (not shown) via a conducting wire 41a, and the second electrode 42 is connected via a conducting wire 42a. In addition, each conducting wire 41a and 42a is coat | covered with the sealing material 46, and is insulated and waterproofed.

  The fixing part 44 fixes the sensor part 43 and also arranges the connecting parts of the conducting wires 41a, 42 and the sensor part 43 inside to ensure waterproofness of the connecting part.

  The cover 45 has a cylindrical shape with one end open, is attached to the fixed portion 44, and houses the sensor portion 43 in an internal space 47 that communicates with the external environment. Further, in addition to the hole at the front end communicating with the internal space 47 (the front end opening of the internal space 47), a plurality of holes 48 are formed in the side wall of the cover 45. The plurality of holes 48, 48... Pierced in the cover 45 surely sense the water level of the circulating water, and reduce erroneous detection due to the circulating water remaining in the cover 45 and not discharged.

  The detection sensor 28 formed as an electrode-type water level detection sensor configured as described above is arranged in a state of being laid on the bottom surface (bottom wall 27 d) in the water receiving tank 27 of the detector 26. And when the cooling tower 10 stops and the circulating water in the receiving tank 27 is lost, and the sensor part 43 of the detection sensor 28 is not immersed in the circulating water, the first and second electrodes 41 and 42 can be energized. Since there is no electrical resistance value, it shows infinite. On the other hand, when the cooling tower 10 is driven and the circulating water accumulates in the water receiving tank 27 and the water level is generated and raised, the first and second electrodes 41 and 42 are energized through the circulating water, and the electric resistance value is infinite. Therefore, the presence of the circulating water, that is, the operation of the cooling tower 10 can be detected. Therefore, the operation state of the cooling tower 10 can be determined from the detection signal from the detection sensor 28 and used as a signal for controlling the drug injection device 24.

  6 to 8 show still another embodiment of the detector 26, and FIG. 6 is a perspective view showing another embodiment of the detector 26. In FIG. 6, the detector 26 includes the water receiving tank 27 and a detection sensor 28 that determines the operation state of the cooling tower 10 from the circulating water dropped and accommodated in the water receiving tank 27.

  The water receiving tank 27 is a box having a substantially rectangular shape with an open upper surface. Of the front and rear side walls 27a and 27b, the front side wall 27a is notched in a V shape from the upper end to the lower end. The water discharge part 29 and the drain hole 30 formed in the position close | similar to the bottom wall 27c are provided. However, as a method of providing the water discharge portion 29, the height of the front side wall 27a is set higher than that of the other side walls 27b and 27c, in addition to the means for notching the front side wall 27a in a V shape from the upper end to the lower end. Can also be lowered.

  The drain hole 30 is provided with a drain pipe 33 provided with a ball valve 32 as an opening degree adjusting means that can adjust the amount of water drained from the drain hole 30 on the way. The ball valve 32 is always “open” so that the circulating water is drained from the water receiving tank 27 when the cooling water circulation pump is stopped.

  However, the opening degree of the ball valve 32 is set so that the circulating water is accumulated in the water receiving tank 27 even when the cooling water circulation pump P is at a minimum load when the cooling water circulation pump P is driven by an inverter system. Even if the supply amount of the circulating water is reduced in accordance with the decrease in the load, the water level in the water receiving tank 27 can be raised to the threshold level or higher to maintain the necessary water level.

  And the said water receiving tank 27 is arrange | positioned on the water spraying board 15 so that a part by the side of the rear side wall 27b may be located just under the said water receiving plate 25, and it is from the water supply port 18a by the driving | operation of the cooling tower 10. A part of the circulating water which is ejected and falls upon hitting the water receiving plate 25 can be received and accommodated. Further, when the water level in the water receiving tank 27 rises to the position of the water discharge portion 29, further circulating water flows out to the outside of the water receiving tank 27 through the water discharge portion 29, and this outflow causes a certain direction in the water receiving tank 27. A water stream 31 is formed.

  The detection sensor 28 is a water flow detection type detection sensor that detects the presence or absence of operation of the cooling tower 10 using the water flow 31 formed in the water receiving tank 27. As shown in FIGS. The holding frame 50, a reed switch 49 attached to the sensor holding frame 50, and an intermediate portion is configured by an actuator 52 attached to the reed switch 49 via a support arm 53 and a pivot 51 so as to be rotatable. Yes. The sensor holding frame 50 is formed in a substantially U-shaped cross section, and the attachment pieces 34a and 34a provided on the left and right sides of the water receiving tank 27 are provided on the upper surface of the water receiving tank 27. The left and right attachment pieces 27d and 27d are attached via bolts and nuts 36, respectively.

  More specifically, the reed switch 49 of the detection sensor 28 is attached to a sensor holding frame 50 fixed on a mounting piece 27d of the water receiving tank 27 with bolts and nuts 36 as shown in FIGS. Yes. The front and rear surfaces of the sensor holding frame 50 are open. On the other hand, the actuator 52 is attached so as to be rotatable in the front-rear opening direction of the sensor holding frame 50 with the pivot 51 as a fulcrum, a permanent magnet 54 is provided at the upper end, and a paddle plate 55 is attached at the lower end. ing. The actuator 52 is set such that the lower part is heavier than the upper part with the pivot 51 as a boundary, and the center of gravity is set to the lower part, so that the lower part is always on the lower side. It turns like a pendulum.

  The detection sensor 28 configured as described above is configured so that the permanent magnet 54 of the actuator 52 corresponds to the reed switch 49 and the paddle plate 55 intersects the water flow 31 substantially at a right angle. It is attached on the water receiving tank 27 in a state where a part is immersed in water.

  Then, when the operation of the cooling tower 10 is stopped and the circulating water is not supplied into the water receiving tank 27 and no water flow is generated, the detection sensor 28 leads the actuator 52 as shown by a solid line in FIGS. It hangs down substantially parallel to the switch 49, and the permanent magnet 54 is held in a state of approaching the reed switch 49. As a result, the reed switch 49 is turned on (indicated by the dotted line in FIG. 8) in response to the magnetic attraction force of the permanent magnet 54, and this state is maintained.

  On the other hand, the operation of the cooling tower 10 is started, the circulating water is supplied from the water supply port 18 a of the circulation line 18, the water level exceeds the threshold value of the water receiving tank 27, flows out to the outside, and the water flow 31 is created in the water receiving tank 27. Then, the paddle plate 55 continuously receives the flow force of the water flow 31. As a result, the actuator 52 rotates in the direction of the water flow 31 as indicated by a two-dot chain line in FIG. 8, and the permanent magnet 54 is greatly separated from the reed switch 49. Further, when the magnetic attractive force of the permanent magnet 54 with respect to the reed switch 49 is weakened by the rotation of the actuator 52, the contact is restored by the elastic force of the reed switch piece and the circuit is opened, and the reed switch 49 is turned on from off (FIG. 8). (Indicated by a two-dot chain line).

  Further, in the medicine injecting device 24, when the reed switch 49 is on (when the cooling tower 10 is stopped), the medicine injecting pump 22 is electrically operated so as not to operate in the control panel (not shown) of the medicine injecting device 24. A general circuit (for example, an interlock) is formed. On the other hand, when the reed switch 49 is off (during the operation of the cooling tower 10), the drug injection pump 22 performs a control operation by a predetermined timer system in the control panel (not shown) of the drug injection device 24. An electrical circuit is formed.

  The reed switch 49 is turned off when the operation of the cooling tower 10 is stopped (when the permanent magnet 54 approaches the reed switch 49), and turned on when the cooling tower is operated (when the permanent magnet 54 is separated from the reed switch 49). It is also possible to use a type of reed switch that switches so as to be, or to change the positional relationship between the permanent magnet 54 and the reed switch 49.

  Therefore, in the medicine injection device 24 using the water flow detection type detection sensor 28 shown in FIGS. 6 to 8, the detection sensor 28 detects the water flow 31 in a certain direction generated in the water receiving tank 27, and this detection signal is used. It is possible to control the driving of the medicine injection pump 22 as intended.

  FIG. 9 is a schematic perspective view showing another embodiment of the water flow detection type detection sensor 28. The detection sensor 28 here also detects the presence or absence of operation of the cooling tower 10 using the water flow 31 formed in the water receiving tank 27, similarly to the detection sensor shown in FIGS. 7 and 8. is there. The detection sensor 28 is rotatable by a pair of front and rear sensor holding frames 56 and 56 fixed by bolts and nuts 36 on a mounting piece 27d of the water receiving tank 27, and the pair of sensor holding frames 56 and 56. A rotating shaft 57 that is supported, and a water wheel 58 that is mounted on the rotating shaft 57 so as to be integrally rotatable with a plurality (eight in the present embodiment) of blades 58a, 58a. A generator 59 having a rotor (not shown) that rotates integrally with the rotating shaft 57 and attached to the sensor holding frames 56, 56, and a voltage of a current generated by the generator 59. A voltage stabilizer 60 for stabilization, a rechargeable battery 61 for storing electric power after being stabilized by the voltage stabilizer 60, a current generated from the generator 59, and a signal indicating the presence or absence of the water stream 31 A power generation discriminating circuit 62 for output is provided. .

  Here, the detection sensor 28 is mounted on the water receiving tank 27 in a state in which the blades 58a of the water wheel 58 intersect the water flow 31 at a substantially right angle and a part of the blades 58a is immersed in water. Yes.

  When the operation of the cooling tower 10 is stopped and the circulating water is not supplied into the water receiving tank 27 and the water flow 31 is not generated, the detection sensor 28 stops the water wheel 58 together with the rotating shaft 57 and the generator 59, Current generation from the generator 59 is also stopped. This current stop state is determined from the detection signal output from the power generation determination circuit 62, and this signal is sent to the drug injection device 24. Thereby, in the medicine injection device 24, the electric connection between the power source and the motor of the medicine injection pump 22 is cut off, and the medicine injection pump 22 is stopped.

  On the other hand, the operation of the cooling tower 10 is started, and circulating water is supplied from the water supply port 18a of the circulation line 18, and the water level exceeds the threshold value of the water receiving tank 27 and flows to the outside. 31 is made, the blades 58a of the water wheel 58 continuously receive the flow force of the water flow 31, and the water wheel 58, the rotating shaft 57, and the rotor of the generator 59 are continuously rotated integrally to generate current from the generator 59. Occur. The generation of this current is detected by the power generation discriminating circuit 62 and this signal is sent to the drug injection device 24. Thereby, in the medicine injection device 24, an electrical connection is established between the power source and the motor of the medicine injection pump 22, and the medicine injection pump 22 is driven.

  Therefore, even in the medicine injection device 24 using the water flow detection type detection sensor 28 shown in FIG. 9, the detection sensor 28 detects the water flow 31 in a certain direction generated in the water receiving tank 27, and the drug injection pump is detected by this detection signal. It becomes possible to control the drive of 22 as intended.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

  Although this invention demonstrated the case where it applied to the cooling tower provided for the circulation supply of cooling water on the roof of buildings, such as a building, it can be applied also to the chemical injection device of the cooling tower installed other than the roof of a building .

DESCRIPTION OF SYMBOLS 10 Cooling tower 14 Sprinkling hole 15 Sprinkling plate 18 Circulation line 18a Water supply port 19 Refrigerator 24 Drug injection device 25 Water receiving plate 26 Detector 27 Water receiving tank 28 Detection sensor 29 Water discharge part 30 Water draining hole 31 Water flow 32 Ball valve (open) (Degree adjustment means)
33 Drain pipe 35 Float sensor 36 Bolt / nut 37 Cylindrical mounting long holes 38a, 38b Fixing bracket 39 Cylindrical body 40 Float 41 First electrode 42 Second electrode 43 Sensor unit 49 Reed switch 52 Actuator 54 Permanent magnet 55 Paddle plate 58 Water wheel 58a Blade 59 Generator 60 Voltage stabilizer 61 Rechargeable battery 62 Power generation discrimination circuit P Cooling water circulation pump

Claims (7)

A water spray plate provided on the filler of the cooling tower and for flowing down the circulating water to be cooled from the water spray holes formed in the bottom portion to the gap of the filler, and the circulating water supplied on the water spray plate is detected. In a medicine injection device of a cooling tower comprising a detector and a medicine injection pump controlled by a detection signal of the detector,
The detector is a water receiving tank that receives and stores a part of the circulating water from a water supply port supplied on the watering plate, and a drain hole that discharges water in the water receiving tank in the vicinity of the bottom of the water receiving tank. a receiving tank having to detect the presence or absence of the circulating water contained in the receiving water tank comprises a sensor for outputting the detection signal, that receiving water tank is not arranged on the sprinkler plate A cooling tower chemical injection device characterized by the above.   The cooling tower chemical injection device according to claim 1, wherein the water receiving tank has an opening degree adjusting means for adjusting an opening degree of the drain hole.   When the water level exceeds a certain height, the water receiving tank causes the stored circulating water to flow out from a specific location of the water receiving tank to form a water flow in a certain direction within the water receiving tank. The drug injection device for a cooling tower according to claim 1 or 2, further comprising a section.   4. The chemical injection device for a cooling tower according to claim 1, wherein the detection sensor is a float sensor that includes a float that moves up and down together with a water level in the water tank, and extracts the movement of the float as a signal. .   The detection sensor is an electrode type sensor having a pair of electrodes for measuring the water level in the water tank by an electric resistance value, and taking out a measurement value detected by the pair of electrodes as a signal. The chemical injection device for a cooling tower according to claim 1, 2 or 3.   The detection sensor includes a switch that can be switched on / off and an actuator that controls switching of the switch, and the lower end of the actuator is immersed in the water flow of the circulating water so that the water flow direction can be freely rotated. The chemical injection device for a cooling tower according to claim 3, wherein the chemical injection device is attached.   The detection sensor includes a water turbine having a plurality of blades that rotate by sequentially immersing the tip in the water flow of the circulating water, and a generator that rotates integrally with the water turbine to generate electric power. The chemical injection device for a cooling tower according to claim 3.

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