JP5612928B2 - Cooling tower operation monitoring device - Google Patents

Description

  The present invention directly or indirectly exchanges heat between an external airflow sucked from the atmosphere by the operation of the blower and the fluid to be cooled, and the sucked external airflow passes through the tower body and is discharged to the atmosphere via the blower. The present invention relates to an operation monitoring apparatus for a cooling tower having a configuration as described above.

  This type of conventional cooling tower includes a blower, a tower body, a heat exchanger loaded in the tower body, and the like, and directly or indirectly between the external air flow sucked from the atmosphere and the fluid to be cooled by the operation of the blower. After performing heat exchange and cooling the fluid to be cooled, the sucked external airflow is discharged into the atmosphere through the inside of the tower body via the blower. Conventionally, this kind of cooling tower is usually not accompanied by an electric panel for the purpose of controlling or operating. In such a cooling tower facility, when a malfunction such as a failure occurs, accurate data on the operation time and the number of operations of the cooling tower is required in order to investigate the cause. Moreover, in order to perform efficient maintenance, a measuring facility capable of accurately measuring the operation time and the number of operations of the cooling tower is required. For this reason, it is necessary to provide the measuring equipment for the operation time and the number of operations as needed on the side of purchasing and installing the cooling tower. Further, when sampling the operation time and the number of operations of the cooling tower, a method of electrically inputting from signals and contacts on the electric circuit is used.

Japanese Patent Laid-Open No. 10-197079 Japanese Patent Application No. 2003-12982

  The cooling tower facilities as described above are usually installed in a place where ordinary people do not approach, such as the rooftop of a building or a basement. In such a place, there is a high-voltage (eg, several hundred volts AC) power supply equipment for driving the cooling tower, but it is more electrical than the signals and contacts on the electrical circuit when sampling the cooling tower operating time and frequency. In general, there is no low-voltage (for example, AC 100 volt) power supply facility for input to the power source. Therefore, there is a problem that a low-voltage power supply facility must be provided for this purpose even if a measurement facility for the operation time and the number of operations is provided. In particular, in order to install the measuring equipment for the operation time and the number of operations in the existing cooling tower equipment, it is necessary to provide a low-voltage power supply equipment for that purpose, which causes a problem that the cost increases.

  The present invention has been made in view of the above points, and it is not necessary to provide a low-voltage power supply facility regardless of whether it is a new cooling tower or an existing cooling tower, and can measure a precise operation time and number of operations over a long period of time. An object of the present invention is to provide an operation monitoring device for a cooling tower equipped with facilities.

In order to solve the above-described problems, the present invention includes a blower, a tower body, and a heat exchanger loaded in the tower body. Between the external airflow sucked from the atmosphere and the fluid to be cooled by the operation of the blower. A cooling tower operation monitoring device configured to directly or indirectly exchange heat and exhaust the external airflow after the heat exchange through the inside of the tower body to the atmosphere via a blower, and the tower is operated by the operation of the blower. Negative pressure detection means for detecting that the body is below a predetermined negative pressure, and the number of operation times for measuring the number of operation and the operation time of the cooling tower from the output of the negative pressure detection means with a built-in battery as a power source An operating time measuring means is provided , and the negative pressure detecting means is responsive to a negative pressure introduction pipe having one end opened in the tower body and the other end opened outside the tower body, and the other end of the negative pressure introduction pipe. Negative pressure reaction displacement means mechanically displaced, and mechanical displacement of the negative pressure reaction displacement means Response was characterized in that it comprises a negative pressure detection signal output means for outputting a negative pressure detection signal to the number of operations and operation time measurement means When it comes under a predetermined negative pressure or higher.

  In the cooling tower operation monitoring apparatus according to the present invention, the negative pressure reaction displacement means is a diaphragm that communicates with the other end of the negative pressure introduction pipe and is displaced in conjunction with the pressure in the tower. .

  In the cooling tower operation monitoring apparatus according to the present invention, the negative pressure reaction displacement means is a piston that communicates with the other end of the negative pressure introduction pipe and is displaced in conjunction with the pressure in the tower. .

  In the cooling tower operation monitoring apparatus according to the present invention, the operation frequency / operation time measuring means is configured to operate the cooling tower when the negative pressure detecting means detects a predetermined negative pressure, and to measure the number of detection times. And an operation time measuring device that measures the time during which the negative pressure detecting means detects a predetermined negative pressure as an operation time, and the battery is incorporated in one or both of the operation number measuring device and the operation time measuring device. It is characterized by being.

  The present invention provides a negative pressure detecting means for detecting that the inside of a tower is reduced to a predetermined negative pressure or less due to operation of a blower, and the number of operation of the cooling tower from the output of the negative pressure detecting means using only the battery as a power source. In addition, since the number of operations and operation time measurement means for measuring operation time are provided, there is no need to provide a special power source for operation monitoring with a simple configuration, only the built-in battery is used as the power source, not only the newly installed cooling tower, It is possible to provide an operation monitoring device that measures the number of operations and the operation time of a cooling tower that can be easily attached to an existing cooling tower.

The negative pressure detecting means includes a negative pressure introduction pipe having one end opened in the tower and the other end opened outside the tower, and a negative pressure that is mechanically displaced in response to the negative pressure at the other end of the negative pressure introduction pipe. a pressure reaction displacement hand stage, a negative pressure detection signal output means for outputting a negative pressure detection signal to the number of operations and operation time measurement means When a negative pressure or under response given to the mechanical displacement of the negative pressure reaction displacement means Since it is provided, the pressure in the tower can be mechanically detected, and even if the capacity of the built-in battery is small, the number of operations and the operation time can be measured over a long period of time (for example, more than ten years).

It is a figure which shows the schematic structural example of the cooling tower using the driving | operation monitoring apparatus which concerns on this invention. It is a figure which shows schematic structure of the driving | operation monitoring apparatus which concerns on this invention. It is a figure which shows the other structural example of the negative pressure detection means of the driving | operation monitoring apparatus which concerns on this invention.

Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a diagram showing a schematic configuration example of a cooling tower using an operation monitoring apparatus according to the present invention. In this cooling tower 10, a tower body 11 is loaded with devices and equipment constituting a cooling tower such as a heat exchanger 12 and a blower 14. When the electric motor 15 is activated and the blower 14 is operated, as shown by an arrow A from the outside air intake port 16, the inflowing outside air stream is directly passed between the outside air stream and the fluid to be cooled via the heat exchanger 12. Alternatively, the fluid to be cooled is cooled by indirectly exchanging heat. The external airflow after the heat exchange is passed through the inside of the tower body 11 as indicated by an arrow B, and is released into the atmosphere via the blower 14 as indicated by an arrow C.

As the heat exchanger 12, an external air flow sucked from the external air suction port 16 is brought into direct contact with water to be cooled which forms a water film on the surface of a large number of gas-liquid contact sheets and flows down. The cooling water is directly cooled by the latent heat of vaporization, and the cooled cooling water is sprayed on a pipe arranged meandering in the heat exchanger to indirectly cool the cooling fluid passing through the pipe. There are closed heat exchangers. There is also an air-cooled heat exchanger that cools the liquid to be cooled flowing through the pipe by bringing the external air sucked from the outside air inlet 16 into contact with the pipe meandering in the heat exchanger.

  By operating the blower 14 as described above, the external air flow sucked from the outside air suction port 16 as shown by the arrow A flows through the region of the tower body 11 where the heat exchanger 12 is loaded, and the tower body 11 In the cooling tower configured to pass through the central portion of the inside as indicated by arrow B and further to the atmosphere as indicated by arrow C via the blower 14, the operation of the blower 14, that is, the operation of the cooling tower 10 is performed. As a result, the pressure of the tower body 11 varies, and the internal pressure of the tower body 11 becomes negative. By detecting that the internal pressure of the tower body 11 has become a predetermined negative pressure, it is possible to know that the cooling tower has been operated. In the present invention, the operation of the cooling tower 10 is detected when the internal pressure of the tower body 11 is equal to or lower than a predetermined negative pressure, the number of detections is counted as the number of times of operation, and the predetermined negative pressure continues. An operation monitoring device 20 that measures time and measures the operation time of the cooling tower 10 is provided outside the cooling tower 10. Hereinafter, the operation monitoring device 20 will be described in detail.

  FIG. 2 is a diagram illustrating a schematic configuration of the operation monitoring apparatus 20. When a trouble such as a failure occurs in the cooling tower 10, the operation time and the number of operations of the cooling tower 10 until the trouble occurs are required to find out the cause accurately and quickly. Moreover, in order to perform maintenance efficiently, the data of operation time and the frequency | count of an operation are needed. Therefore, in the present operation monitoring device 20, an operation number measuring device 30 for measuring the number of operations and an operation time measuring device 40 for measuring the operation time are provided.

  The operation number measuring device 30 and the operation time measuring device 40 are each provided with batteries 31 and 41 incorporated therein, and can measure the number of operation times and the operation time for a long time using only the batteries 31 and 41 as a power source. The operation monitoring device 20 is provided with a negative pressure detection switch 21 for detecting that the inside of the tower body 11 has become a predetermined negative pressure or less due to the operation of the cooling tower 10, that is, the operation of the blower 14. When a predetermined negative pressure is detected, the operation number measuring device 30 counts +1 by assuming that the cooling tower 10 is operated, and integrates the number of operations. Further, it is assumed that the cooling tower 10 is in operation while the operation time measuring device 40 detects that the negative pressure detection switch 21 is equal to or lower than the predetermined negative pressure, and that the operation time is integrated by counting +1 every predetermined time. It has become.

  The operation number measuring device 30 includes an LCD display 32. As the built-in battery 31, for example, the cumulative number of operations measured with a lithium battery (battery life of about 7 years or more (25 ° C.)) is 8 digits (0 to 99999999). It can be displayed and the counting input is a no-voltage input. The operation time measuring device 40 includes an LCD display 42. As the built-in battery 41, for example, the cumulative operation time measured with a lithium battery (battery life of about 10 years or more (25 ° C.)) is 7 digits (0.0 h). ~ 99999999.9h), and the count input is a no-voltage input.

  The negative pressure detection switch 21 includes a diaphragm 22, and the inside of the diaphragm 22 communicates with the inside of the tower body 11 of the cooling tower 10 through a negative pressure introduction pipe 23 so that it expands and contracts due to a pressure change in the tower body 11. It has become. That is, when the air blower 14 is stopped and the operation of the cooling tower 10 is stopped, the inside of the tower body 11 is at atmospheric pressure, and the diaphragm 22 communicating with the inside is inflated. When it is operated and the inside of the tower 11 becomes negative pressure, it contracts. Reference numeral 24 denotes a micro switch. The cooling tower 10 is stopped and the inside of the diaphragm 22 is at an atmospheric pressure and is in an ON or OFF state in an expanded state. The cooling tower 10 is operated and the inside of the tower body 11 is contracted to a predetermined negative pressure. In contrast, the state is OFF or ON. The pressure setting of the diaphragm 22 is a dial type setting (30 Pa to 300 Pa). The operation number measuring device 30, the operation time measuring device 40, the negative pressure detection switch 21 and the like constituting the operation monitoring device 20 are accommodated in a sealed case (for example, a resin-made sealed case).

The operation monitoring apparatus 20 having the above configuration is installed at a predetermined position outside the tower body 11, and the inside of the tower body 11 of the cooling tower 10 and the inside of the diaphragm 22 of the negative pressure detection switch 21 are communicated with each other by a negative pressure introduction pipe 23. 22 expands and contracts in conjunction with the internal pressure of the tower body 11, the cooling tower 10 is operated and the internal pressure of the tower body 11 falls below a predetermined negative pressure, and the microswitch 24 is turned off or on, the cooling tower operating frequency meter 30 as 10 is operated +1 counts every one OFF or oN, the operation time counter 40 is incremented count between every predetermined time the OFF or oN continues, its Resolution Measure the cumulative number of operations and cumulative operation time.

  The negative pressure detection switch 21 shown in FIG. 2 connects the inside of the diaphragm 22 and the inside of the tower body 11 with a negative pressure introducing pipe 23, and the pressure fluctuation in the tower body 11 is interlocked with the expansion / contraction of the diaphragm 22, Although the operation of the cooling tower 10 is detected, the operation detection of the cooling tower 10 is not limited to this. For example, the negative pressure detection switch 21 schematically shown in FIG. There is also. In FIG. 3, the negative pressure detection switch 21 is provided with a cylinder 25 and a piston 26 that slides in the cylinder 25. The inside of the cylinder 25 and the inside of the tower body 11 are communicated with each other by a negative pressure introduction pipe 23. A magnet 26 a is provided at a predetermined position of the piston 26, and a magnet switch 28 is provided at a predetermined position on the outer periphery of the cylinder 25.

  When the operation of the cooling tower 10 is stopped and the inside of the tower body 11 is at atmospheric pressure, the piston 26 is pushed to the air release hole 25a side of the cylinder 25 by the elastic force of the spring 27 as shown in FIG. ing. In this state, the magnetic force of the magnet 26a does not act on the magnet switch 28, the magnet switch 28 is inoperative, and its contact is in an ON or OFF state. When the cooling tower 10 is operated, that is, the blower 14 is operated and the inside of the tower body 11 becomes negative pressure, the inside of the cylinder 25 also becomes negative pressure in conjunction with it. The piston 26 whose negative pressure is equal to or lower than a predetermined negative pressure moves to the position of the magnet switch 28 against the elastic force of the spring 27. As a result, the magnet switch 28 is operated and its contact point is in the OFF or ON state opposite to the above, and it is detected that the cooling tower 10 has been operated. Although not shown, the output terminal of the magnet switch 28 is connected to the operation number measuring device 30 and the operation time measuring device 40 as in FIG. 2, and measures the number of operations and the operation time. In the above example, the magnet 26a is installed on the piston 26, and the magnet switch 28 is operated by the magnet 26a. However, if the airtightness in the cylinder 25 is maintained, the magnet switch 28 is replaced with a micro switch 28. A switch may be provided, and the microswitch may be mechanically operated by the movement of the piston 26 so that the contact is turned ON / OFF.

  In the above example, the negative pressure in the tower body 11 due to the operation of the cooling tower 10 is introduced into the negative pressure detection switch 21 installed outside the tower body 11 by the negative pressure introduction pipe 23. A small negative pressure detection switch is operated by operating the inside of the tower so that the contact is turned on or off at atmospheric pressure, and the contact is turned off or on at a predetermined negative pressure or lower. When the negative pressure detection switch detects that the internal pressure of the tower body 11 has become equal to or lower than a predetermined negative pressure (contact point is OFF or ON), it is provided outside the tower body 11. It may be determined that the cooling tower 10 is operated by the operation number measuring device 30 and the operation time measuring device 40. Moreover, when installing the cooling tower 10 in the place which sunlight irradiates on the roof of a building, the battery which can be charged / discharged with a small solar cell can also be used. Further, the battery need not be incorporated in both the operation number measuring device 30 and the operation time measuring device 40, and one battery may be shared by the operation number measuring device 30 and the operation time measuring device 40.

  By configuring the operation monitoring device 20 as described above, the number of operations and the operation time of the cooling tower 10 can be measured for a long time (7 to 10 years). Of course, when the cooling tower 10 is newly installed, An operation monitoring device that can measure the number of operations and the operation time can be easily installed in a cooling tower installed in a place without existing low power supply facilities.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible.

  The present invention provides a negative pressure detecting means for detecting that the inside of a tower is reduced to a predetermined negative pressure or less due to operation of a blower, and the number of operation of the cooling tower from the output of the negative pressure detecting means using only the battery as a power source. In addition, since the number of operations and operation time measurement means for measuring operation time are provided, there is no need to provide a special power source for operation monitoring with a simple configuration, only the built-in battery is used as the power source, not only the newly installed cooling tower, The present invention can be used as an operation monitoring device that measures the number of operation times and the operation time of a cooling tower that can be easily attached to an existing cooling tower.

  The negative pressure detecting means includes a negative pressure introduction pipe having one end opened in the tower and the other end opened outside the tower, and a negative pressure that is mechanically displaced in response to the negative pressure at the other end of the negative pressure introduction pipe. Pressure response displacement means, and negative pressure detection signal output means that operates by mechanical displacement of the negative pressure reaction displacement means, receives electric power from the battery, and outputs a negative pressure detection signal to the operation frequency / operation time measurement means. Since the pressure in the tower can be mechanically detected, it can be used as an operation monitoring device capable of measuring the number of operations and the operation time over a long period of time (for example, more than ten years) even if the capacity of the built-in battery is small.

DESCRIPTION OF SYMBOLS 10 Cooling tower 11 Tower 12 Heat exchanger 14 Blower 15 Electric motor 16 Outside air inlet 20 Operation monitoring device 21 Negative pressure detection switch 22 Diaphragm 23 Negative pressure introduction pipe 24 Micro switch 25 Cylinder 26 Piston 27 Spring 28 Magnetic switch 30 Operation frequency measurement Device 31 Battery 32 LCD display 40 Operating time measuring device 41 Battery 42 LCD display

Claims (4)

Air blower, tower body, heat exchanger loaded in the tower body, heat exchange is completed by directly or indirectly heat exchange between the external air flow sucked from the atmosphere by the operation of the air blower and the fluid to be cooled A cooling tower operation monitoring device configured to discharge the external airflow through the inside of the tower body to the atmosphere via the blower,
A negative pressure detecting means for detecting that the inside of the tower falls below a predetermined negative pressure by the operation of the blower;
Provided with an operation frequency / operation time measurement means for measuring the number of operation times and operation time of the cooling tower from the output of the negative pressure detection means using only the battery as a power source ,
Further, the negative pressure detecting means is mechanically displaced in response to negative pressure at a negative pressure introduction pipe having one end opened in the tower body and the other end opened outside the tower body, and the other end of the negative pressure introduction pipe. Negative pressure reaction displacement means for outputting, and negative pressure detection signal output for outputting a negative pressure detection signal to the operation frequency / operation time measurement means in response to a mechanical displacement of the negative pressure reaction displacement means when the pressure falls below a predetermined negative pressure operation monitoring device of the cooling tower, characterized in that it comprises means. In the cooling tower operation monitoring apparatus according to claim 1 ,
The cooling tower operation monitoring apparatus, wherein the negative pressure reaction displacement means is a diaphragm that communicates with the other end of the negative pressure introduction pipe and is displaced in conjunction with the pressure in the tower. In the cooling tower operation monitoring apparatus according to claim 1 ,
The cooling tower operation monitoring device, wherein the negative pressure reaction displacement means is a piston that communicates with the other end of the negative pressure introduction pipe and is displaced in conjunction with the pressure in the tower. 4. The cooling tower operation monitoring device according to claim 1 , wherein the operation frequency / operation time measuring means detects the predetermined negative pressure and operates the cooling tower when the predetermined negative pressure is detected. An operation number measuring device for measuring the number of times, and an operation time measuring device for measuring the time during which the negative pressure detecting means detects a predetermined negative pressure as an operation time, and the battery is the operation number measuring device or the operation time. An operation monitoring device for a cooling tower, which is incorporated in one or both of the measuring instruments.

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