Abstract:
Construction of a valve-member monitoring system using wireless communication is facilitated. The valve-member monitoring system is structured with operating-condition sensors each attached to each of multiple steam traps installed on a manifold. The manifold serves as a discharged condensate collecting pipe in which condensate is discharged through the multiple steam traps. The valve-member monitoring system further includes a sensor controlling terminal device that is attached to the manifold or in the vicinity of the manifold and exchanges information by radio with a central control apparatus. In the valve-member monitoring system, the terminal device is connected to the operating-condition sensors each attached to each of the steam traps installed on the manifold with lead lines. This reduces time and effort required to determine which operating-condition sensors are to be connected to the terminal device, and therefore facilitates the construction of the valve-member monitoring system, which are excellent results.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to valve-member monitoring systems for monitoring the operating condition of valve members, which are represented by typical valves and steam traps, installed on fluid piping in factories, plants and other facilities and used in various applications. In particular, the present invention relates to a valve-member monitoring system including operating-condition sensors each attached to each of multiple valve members and a sensor controlling terminal device that exchanges information by radio with a central control apparatus and that is connected to the operating-condition sensors. 
         [0003]    2.Description of the Related Art 
         [0004]    A well-known valve-member monitoring system is disclosed in, for example, U.S. Pat. No. 6,145,529. This type of valve-member monitoring system requires a sensor controlling terminal device, which exchanges information by radio with a central control apparatus, to be connected with associated operating-condition sensors. This involves determining which operating-condition sensors are to be connected to the terminal device. 
       SUMMARY OF THE INVENTION 
       [0005]    In the above-mentioned well-known valve-member monitoring system, the determination of which operating-condition sensors are to be connected to the terminal device needs to be made under consideration of the layout and distance between the terminal device and each operating-condition sensor, obstructions and some other factors, which requires considerable time and effort to make the determination. 
         [0006]    Therefore, the present invention has been made to provide a valve-member monitoring system capable of effectively solving the above-mentioned problem by employing a rational structure. 
         [0007]    For the purpose of solving the problem, a valve-member monitoring system according to an embodiment of the present invention includes operating-condition sensors each attached to each of multiple valve members installed on a manifold. The manifold serves as a discharged condensate collecting pipe in which condensate is discharged through multiple steam traps or serves as a fluid distribution pipe in which fluid is separated and delivered through multiple valves. The valve-member monitoring system further includes a sensor controlling terminal device that is attached to the manifold or is provided in the vicinity of the manifold and exchanges information by radio with a central control apparatus. In the valve-member monitoring system, the sensor controlling terminal device is connected to the operating-condition sensors each attached to each of the valve members installed on the manifold. 
         [0008]    According to the present invention, the operating-condition sensors each attached to each of the valve members installed on the manifold are connected to the terminal device attached to the manifold or provided in the vicinity of the manifold, thereby reducing the time and effort required to determine which operating-condition sensors are to be connected to the terminal device and therefore facilitating the construction of the valve-member monitoring system, which are excellent results. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]    Embodiments of the present invention will be described in detail based on the following figures, wherein: 
           [0010]      FIG. 1  is a schematic plan view showing an overview of a valve-member monitoring system according to an embodiment of the present invention; 
           [0011]      FIG. 2  is a block diagram showing the configuration of a terminal device according to the embodiment of the present invention; 
           [0012]      FIG. 3  is a schematic plan view showing an overview of a valve-member monitoring system of another embodiment of the present invention; and 
           [0013]      FIG. 4  is a block diagram showing the configuration of a sensor according to the embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0014]    An embodiment of the present invention will be described below by referring to  FIGS. 1 to 4 .  FIG. 1  illustrates a monitoring system for monitoring the operating condition of multiple steam traps  1  installed on fluid piping in a factory, plant or another facility. A manifold  3  serves as a discharged condensate collecting pipe  2  in which condensate is discharged through the steam traps  1 . The discharged condensate collecting pipe  2  has four condensate inlets on the left and right sides thereof, a condensate outlet at the top, and a blow port at the bottom. On each of the left and right condensate inlets, an inlet valve  4 , a steam trap  1  and an outlet valve  5  are mounted from the upstream. A blowdown valve  6  is mounted on the blow port at the bottom of the pipe  2 . The number of the condensate inlets is not limited to eight, so four, sixteen or a required number of condensate inlets can be provided. Attached to the entry port of each steam trap  1  is an operating-condition sensor  7 , which may be a vibration sensor or temperature sensor, used for detecting the operating condition of the steam trap  1 . At the upper part of the manifold  3 , a sensor controlling terminal device  9 , which exchanges information by radio with a central control apparatus  8 , is secured with U bolts (not shown). The terminal device  9  can be also attached to an existing or newly-built structure, such as a column, in the vicinity of the manifold  3 . The operating-condition sensors  7  each attached to the multiple steam traps  1  are connected to the terminal device  9  via lead lines  10  (In  FIG. 1 , the lead lines are shown only for the uppermost level, but not shown for the second to fourth levels). 
         [0015]    The terminal device  9 , as shown in  FIG. 2 , includes a digital circuit  21  using a microprocessor, an analog circuit  22  that has an input selector switch circuit  22   a  that successively inputs information detected by the sensors  7 , a communication unit  23  that transmits and receives the information via an antenna  23   a , a power supply controller  24  that controls electric power to be supplied to the analog circuit  22  and communication unit  23 , a power source battery  25 , a storage unit  26  that stores setting information and other type of information, and a warning light  27  using an LED. The digital circuit  21  in the terminal device  9  controls the power supply controller  24  to supply power to the analog circuit  22  at set time intervals or at a set time pursuant to setting information transmitted by radio from the central control apparatus  8  so as to activate the analog circuit  22  from a sleep mode to an active mode. The analog circuit  22  in the active mode inputs information detected by the multiple sensors  7  in succession. After the input process, the power supply controller  24  performs power supply control to return the analog circuit  22  to sleep mode. The input information detected by the sensors is processed in the digital circuit  21 . Subsequent to the input process of the information detected by the sensors, the digital circuit  21  of the terminal device  9 , in the same manner, controls the power supply controller  24  to supply power to the communication unit  23  so as to activate the communication unit  23  from sleep mode to active mode. The communication unit in the active mode transmits the information, which was detected by the sensors and was processed in the digital circuit  21 , to the central control apparatus  8  as well as receives instruction information from the central control apparatus  8 . Subsequent to the transmission/receipt process, the power supply controller  24  performs power supply control to return the communication unit  23  to sleep mode. 
         [0016]    When the digital circuit  21  of the terminal device  9  has received a signal from the central control apparatus  8  while the communication unit  23  is in the sleep mode, the digital circuit  21  temporarily puts the communication unit  23  into active mode to receive the signal. In addition, the digital circuit  21  of the terminal device  9  keeps track of the output voltage of the power source battery  25  and the strength of signals received by the communication unit  23 , while making a function check of the multiple sensors  7  and each component in the terminal device  9  in accordance with instructions from the central control apparatus  8 . When the output voltage of the power source battery  25  is decreased below a set value, the strength of the received signal is decreased below a set value, or a malfunction is detected in the function check of the multiple sensors  7  and components in the terminal device, the digital circuit  21  transmits an anomaly signal to the central control apparatus  8  and flashes a warning light  27  to report the anomaly. Note that the terminal device  9  is operable by not only the power source battery  25 , but also a utility power source, non-utility power source and auxiliary power source such as solar batteries. 
         [0017]    The central control apparatus  8 , as shown in  FIG. 1 , includes a personal computer  13  having a processing controller  11  using a microprocessor and a storage unit  12  using a hard disc or the like, a display monitor  14 , a peripheral device such as a keyboard  15 , and a wireless modem  16  connected thereto. The central control apparatus  8  performs radio communications with the terminal device  9  through the wireless modem  16 . The processing controller  11  of the central control apparatus  8  diagnoses the operating condition of each steam trap  1  based on the above-described sensor-detected information transmitted from the terminal device  9 , displays the diagnosed results on the display monitor  14 , stores the results in the storage unit  12 , and instructs the terminal device  9  through radio communications to flash the warning light  27 . When the processing controller  11  of the central control apparatus  8  has received an anomaly signal about the aforementioned malfunctions and signal strength reduction from the terminal device  9 , the processing controller  11  displays the anomaly information on the display monitor  14  and stores it in the storage unit  12 . The storage unit  12  of the central control apparatus  8  has a program therein that allows the processing controller  11  to perform the above processes including communications using the wireless modem  16 . 
         [0018]      FIG. 3  shows a monitoring system, according to another embodiment of the present invention, that monitors the operating condition of multiple valves  31  installed on fluid piping in a factory, plant or another facility. A manifold  33  serves as a fluid distribution pipe  32  in which fluid is separated and delivered through the valves  31 . The fluid distribution pipe  32  has four steam outlets on the left and right sides thereof, a steam inlet at the top, and a blow port at the bottom. On each of the left and right steam outlets, a valve  31  is mounted. A blowdown valve  36  is mounted on the blow port at the bottom of the pipe  32 . The number of the steam outlets is not limited to eight, so four, sixteen or a required number of steam outlets can be provided. Attached to the exit port of each valve  31  is an operating-condition sensor  7 , which may be a vibration sensor or temperature sensor, used for detecting the operating condition of the valve  31 . At the upper part of the manifold  33 , a sensor controlling terminal device  9 , which exchanges information by radio with a central control apparatus  8 , is secured with U bolts (not shown). The terminal device  9  can be also attached to an existing or a newly-built structure, such as a column, in the vicinity of the manifold  33 . The operating-condition sensors  7  each attached to the multiple valves  31  are connected to the terminal device  9  via lead lines  10  (In  FIG. 3 , the lead lines are shown only for the uppermost level, but not shown for the second to fourth levels). 
         [0019]    Although the sensors  7  are connected to the terminal device  9  with lead lines  10  in the aforementioned embodiment, radio communication is available to connect the terminal device  9  and sensors  7 . Each sensor  7  with radio communication capability, as shown in  FIG. 4 , includes a digital circuit  41  using a microprocessor, a detector  42  that detects the operating condition of the valve  31 , a communication unit  43  that transmits and receives information via an antenna  43   a,  a power supply controller  44  that controls the supply of electric power to the detector  42  and communication unit  43 , a power source battery  45 , a storage unit  46  that stores setting information and other types of information, and a warning light  47  using an LED. The terminal device  9  includes the same components shown in  FIG. 2  except for the analog circuit  22  and sensors  7 . The digital circuit  41  of the sensor  7  that is connected to the terminal device  9  by radio, controls the power supply controller  44  at set time intervals or at a set time pursuant to the setting information transmitted by radio from the central control apparatus  8  so as to activate the detector  42  and communication unit  43  from sleep mode to active mode. The detector  42  in the active mode detects the operating condition of the steam trap  1  or valve  31  and the communication unit  43  in the active mode transmits the detected information to the terminal device  9 . Subsequent to the transmission process, the power supply controller  44  performs power supply control to return the detector  42  and communication unit  43  to sleep mode. When the communication unit  43  has received a signal from the central control apparatus  8  during sleep mode, the digital circuit  41  of the sensor  7  temporarily puts the communication unit  43  into active mode to receive the signal. In addition, the digital circuit  41  of the sensor  7  keeps track of the output voltage of the power source battery  45  and the strength of signals received by the communication unit  43 , while making a function check of components in the sensors in accordance with instructions from the central control apparatus  8 . When the output voltage of the power source battery  45  is decreased below a set value, the strength of the received signal is decreased below a set value, or a malfunction is detected in the function check of the sensor components, the digital circuit  41  transmits an anomaly signal to the central control apparatus  8  and flashes a warning light  47  to report the anomaly. Note that the sensors  7  are operable by not only the power source battery  45 , but also a utility power source, non-utility power source and auxiliary power source such as solar batteries. 
         [0020]    The embodiments of the present invention can be applied to a valve-member monitoring system in which an operating-condition sensor is attached to each of multiple valves installed on fluid piping in factories, plants and other facilities and the plurality of operating-condition sensors are connected to a sensor controlling terminal device capable of exchanging information by radio with a central control apparatus. 
         [0021]    It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and alterations may occur depending on design requirements and other factors insofar as they are within the scope of the appended claims or the equivalents thereof.