JP3892499B2 - Management apparatus and management method for differential pressure holding damper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a damper installed on a wall between two chambers in order to maintain a pressure difference between two chambers at a constant value, that is, a management apparatus and a management method for a differential pressure retaining damper.
[0002]
The differential pressure holding damper (barometric damper) opens and closes according to the pressure difference between the two chambers, and the damper body with the counterweight operates to keep the pressure difference constant by automatically increasing or decreasing the passing air volume. For example, it is installed to maintain a predetermined positive pressure by managing the differential pressure in a room such as a clean room.
[0003]
Conventionally, when such a test and adjustment of the differential pressure holding damper and management of the operation status, etc., an operator goes to the installation location of the differential pressure holding damper and visually observes the operating status of the opening and closing.
[0004]
[Problems to be solved by the invention]
In a clean room, etc., where differential pressure management is required for many rooms, the differential pressure holding damper must be managed in response to changes in the operating condition of the air conditioner or environmental changes such as the opening and closing of doors and changes in human behavior. Therefore, it is necessary to visually observe the operating conditions of all the differential pressure retaining dampers, and it takes a lot of time and labor to manage the airflow.
The present invention aims to solve such problems.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, a limit switch for opening / closing detection is installed in the differential pressure holding damper, and a monitoring device for detecting the operation of the damper by an ON-OFF signal of this limit switch is installed remotely, This monitoring device starts monitoring the ON / OFF signal of the limit switch after the elapse of a predetermined time after the start of the operation of the air conditioner, and when the limit switch issues a signal corresponding to the closing of the differential pressure holding damper. Measure the duration of the signal, and if it continues for a predetermined time, determine the abnormality and issue an alarm, and start monitoring the ON / OFF signal of the limit switch after the elapse of the predetermined time after the operation of the air conditioner is stopped If the limit switch emits a signal corresponding to the opening of the differential pressure holding damper, the duration of the signal is counted and Suggest managing device of the differential pressure holding the damper which is configured to perform a sequence processing for issuing an alarm by determining normal.
[0006]
In the present invention, an opening / closing detection limit switch is installed in the differential pressure holding damper, and a monitoring device for detecting the operation of the damper is remotely installed by an ON-OFF signal of the limit switch. When the limit switch ON-OFF signal is monitored after a predetermined time has elapsed since the start of the operation, and the limit switch is emitting a signal corresponding to the closing of the differential pressure holding damper, the duration of the signal is set to When the time is measured and the operation continues for a predetermined time, an abnormality is determined and an alarm is issued, and monitoring of the limit switch ON-OFF signal is started after the elapse of the predetermined time after the operation of the air conditioner is stopped. When a signal corresponding to the opening of the pressure holding damper is issued, the duration of the signal is measured, and if it continues for a predetermined time, an abnormality is judged and an alarm is given. We propose a method of managing it and the differential pressure holding the damper that emits.
[ 0007 ]
According to the above management device, since the operation state of opening / closing of the differential pressure holding damper can be detected by the monitoring device, a large number of differential pressure holding dampers can be collectively managed remotely.
[0008]
In the monitoring device, it is possible to determine whether the operation of each differential pressure holding damper is normal or abnormal by judging the operation status of the opening and closing of a large number of differential pressure holding dampers in light of the operating state of the air conditioner. it can. Such a determination operation can be performed by a sequence process linked to the operation of the air conditioner in the monitoring device. After the start of the air conditioner and after the stop of the operation, the air conditioner is started by monitoring after a predetermined time has elapsed. By excluding the “abnormality response signal” in the unstable state of airflow immediately after the start of operation of the machine and immediately after the operation is stopped, only true operation abnormality can be detected.
[ 0009 ]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a system diagram conceptually showing the configuration of a differential pressure holding damper management device to which the present invention is applied, and FIGS. 2 and 3 are longitudinal sectional views of the differential pressure holding damper to which the present invention is applied. These are the AA arrow enlarged views of FIG.
Reference numeral 1 denotes a differential pressure holding damper. The differential pressure holding damper 1 is generally composed of a damper frame 3 attached to the opening of the wall 2 between the two chambers A and B, and a fulcrum 4 around the damper frame 3. The damper blade 5 is rotatably supported. The damper frame 3 is provided with a seat 6 with which the damper blade 5 abuts and closes the opening, and the damper blade 5 is provided with a lever 7 on the outside so that the counterweight 8 is attached to this lever. 7 and can be fixed by a tightening screw 9 at an appropriate position. As the basic structure and the incidental structure of the differential pressure maintaining damper 1, those having an appropriate structure can be used, and the basic operation is the same as that of the conventional one, and detailed description thereof is omitted. To do.
[ 0010 ]
In the differential pressure maintaining damper of the present invention, an open / close detection limit switch is installed in addition to the above basic configuration. That is, in the configuration of FIGS. 2 to 4, the switch mounting box 10 is installed on the lower side of the damper frame 3 in the drawing, that is, inside the position corresponding to the end side far from the fulcrum 4 of the damper blade 5. A limit switch 11 is installed in the mounting box 10. More specifically, an inclined surface 12 is formed in the mounting box 10, and a long hole 14 for attaching the limit switch body 13 is formed in the inclined surface 12. The length direction of the long hole 14 is along the inclined surface 12, but corresponds to the left-right direction of the damper frame 3.
[ 0011 ]
The limit switch body 13 is rod-shaped and has a clamping nut 15 for clamping. The limit switch body 13 is inserted into the long hole 14 and clamped by the clamping nut 15 to be fixed. The limit switch 11 has a wire spring protruding from the limit switch body 13 as an actuator 16, that is, the limit switch 11 uses a wire spring tactile switch. By attaching the limit switch body 13 to the mounting box 10 as described above, the tip of the wire spring 16 can project outward in an oblique direction beyond the opening as shown in FIG. The protruding length and the horizontal position can be adjusted by shifting the fixing position of the limit switch body 13 along the long hole 14.
[ 0012 ]
In the above configuration, as shown in FIG. 3, due to the pressure difference between the A chamber and the B chamber, the damper blade 5 rotates upward against the weight including the counterweight 8, and the differential pressure retaining damper 1 is opened. In the state where the wire spring 16 is in a free state, the wire spring 16 is ON. That is, in this example, the limit switch 11 always uses a closed contact.
[ 0013 ]
However, when the damper blade 5 rotates downward due to the weight including the counterweight 8 and is closed, the wire spring 16 is pushed by the damper blade 5 to be elastically deformed, and the contact portion in the limit switch body 13 operates to operate the limit switch. 11 is OFF. From the above, the open / close state of the damper blade 5 can be detected by the ON-OFF signal of the limit switch 11.
[ 0014 ]
As long as the limit switch is configured to generate an ON-OFF signal in accordance with the open / closed state of the damper blade 5, in addition to the configuration described above, the configuration of the actuator 16, the configuration of the contacts, the support configuration, etc. The configuration can be used.
[ 0015 ]
Next, in FIG. 1, reference numeral 1 (1a, 1b, 1c,...) Is a differential pressure holding damper having the above-described configuration, and each reference numeral excluding the suffixes a, b, and c is the same reference numeral in FIGS. The description of these elements is omitted.
These plural or many differential pressure holding dampers 1 are configured on the wall between the plural or many chambers, and the monitoring device 17 is configured at a position appropriately separated from these differential pressure holding dampers 1. Yes. Each signal line 19 from the limit switch 11 of the differential pressure holding damper 1 is connected to an input portion provided in the apparatus main body 18 of the monitoring device 17, so that a plurality or a plurality of differential pressure holdings at remote positions are held. The operation state of opening and closing of the damper 1 can be remotely detected by the monitoring device 17, and therefore, the plurality or a plurality of differential pressure holding dampers 1 can be collectively managed.
The monitoring device 17 can monitor the opening / closing operation of each of the differential pressure retaining dampers 1 in a normal operation state, thereby managing the airflow from the air conditioner, that is, managing the differential pressure in each chamber.
[ 0016 ]
Next, a sequence in which the monitoring device 17 confirms whether the operations of the plurality of differential pressure holding dampers 1 are normal or abnormal will be described next.
[1]... Monitoring during operation of air conditioner Step S1: The signal of the limit switch 11 is monitored by the monitoring device body 18. At this time, the signal of the limit switch 11 is ignored and is not monitored until a predetermined time, for example, 120 seconds elapses after the air conditioner starts operation, and the signal of the limit switch 11 is monitored after the predetermined time elapses. Start. By providing such a predetermined time, it is possible to detect only a true abnormality by excluding an “abnormality response signal” in a state where the airflow is unstable immediately after the start of operation of the air conditioner.
↓
Step S2: The signal of the limit switch 11 is judged and a signal corresponding to “open” of the differential pressure holding damper 1, that is, in the above example, when an ON signal is issued, it is determined as “normal” and in step S1. Continue monitoring. On the other hand, if the limit switch 11 has issued an OFF signal that is a signal corresponding to the “closed” of the differential pressure retaining damper, it is temporarily determined as “abnormal” and the process proceeds to the next step S3.
↓
Step S3: The time duration of the OFF signal in Step S2 is measured, and when it continues for a predetermined time, for example, 30 seconds, it is determined as true “abnormal” and the process proceeds to the alarm processing in the next Step S4. As described above, only when the abnormality response signal continues for a predetermined time is determined as a true “abnormality”, the differential pressure holding damper is temporarily caused by the air flow fluctuation due to the opening / closing of the room door or the movement of the person. It is possible to prevent the alarm process from being performed when the operation is closed.
↓
Step S4: When it is determined in step S3 that the true “abnormality” has occurred, an alarm process for turning on the alarm lamp 20 and sounding the buzzer 21 is performed. In this case, the alarm lamp 20 continues to be lit until the reset process is performed by the reset switch after on-site confirmation, and the buzzer 21 is set to perform the reset process or continue to ring until a predetermined time, for example, 60 minutes elapses. .
[ 0017 ]
[2] ... Monitoring when the air conditioner is stopped Step S11: Until the predetermined time, for example, 120 seconds elapses after the air conditioner stops operation, the signal of the limit switch 11 is ignored and monitoring is not performed. After the elapse of time, monitoring of the signal of the limit switch 11 is started. Accordingly, in the same manner as described above, it is possible to detect only a true abnormality by excluding the “abnormality response signal” in a state where the airflow is unstable immediately after the operation of the air conditioner is stopped.
↓
Step S12: The signal of the limit switch 11 is judged, and if the signal corresponding to “closed” of the differential pressure retaining damper 1, that is, in the above example, the OFF signal is issued, the monitoring is continued as “normal”. . On the other hand, if the limit switch 11 has issued an ON signal that is a signal corresponding to the “open” of the differential pressure holding damper, it is temporarily determined as “abnormal” and the process proceeds to the next step S13.
↓
Step S13: The time duration of the ON signal in Step S12 is counted, and if it continues for a predetermined time, for example, 30 seconds, it is determined as true “abnormal” and the process proceeds to the alarm processing in the next Step S14.
↓
Step S14: Alarm processing similar to that in step S4 is performed.
[ 0018 ]
With the above sequence, the open / closed state of the differential pressure retaining damper 1 can be collectively monitored by the remote monitoring device 17, and an alarm can be issued as necessary, so that the airflow management of all the rooms is performed collectively. be able to.
[ 0019 ]
Such airflow management can be performed in a clean room or the like, for example, during test operation, or for test adjustment after the facility is completed.
[ 0020 ]
【The invention's effect】
As described above, the present invention can detect the operation state of opening and closing of the differential pressure holding damper in a remotely installed monitoring device, so that a large number of differential pressure holding dampers can be monitored at a time, and airflow management can be performed. The time and labor required can be reduced.
[Brief description of the drawings]
FIG. 1 is a system diagram conceptually showing the structure of a management apparatus for a differential pressure holding damper to which the present invention is applied.
FIG. 2 is a longitudinal sectional view of a differential pressure retaining damper to which the present invention is applied in a closed state.
FIG. 3 is a longitudinal sectional view of a differential pressure holding damper to which the present invention is applied in an open state.
4 is an enlarged view taken along the line AA in FIG. 2;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Differential pressure maintenance damper 2 Wall 3 Damper frame 4 Support point 5 Damper blade 6 Seat 7 Lever 8 Counterweight 9 Tightening screw 10 Mounting box 11 Limit switch 12 Inclined surface 13 Limit switch body 14 Long hole 15 Tightening nut 16 Actuator (Wire spring)
17 Monitoring device 18 Monitoring device body 19 Signal line 20 Alarm lamp 21 Buzzer

Claims (2)

A limit switch for opening / closing detection is installed in the differential pressure holding damper, and a monitoring device that detects the operation of the damper by the ON-OFF signal of this limit switch is installed remotely. When a limit switch ON-OFF signal is monitored after a predetermined time has elapsed, and the limit switch issues a signal corresponding to the closing of the differential pressure holding damper, the time duration of the signal is counted and If the time continues, an abnormality is determined and an alarm is issued, and monitoring of the limit switch ON / OFF signal is started after the elapse of a predetermined time after the operation of the air conditioner is stopped, and the limit switch opens the differential pressure holding damper. When the signal corresponding to the signal is issued, the duration of the signal is counted, and when the signal is continued for a predetermined time, an abnormality is determined and an alarm is issued. Management device of the differential pressure holding the damper, characterized in that a configuration of performing A limit switch for open / close detection is installed in the differential pressure holding damper, and a monitoring device for detecting the operation of the damper is remotely installed by an ON-OFF signal of the limit switch. When a limit switch ON-OFF signal is monitored after a predetermined time has elapsed, and the limit switch issues a signal corresponding to the closing of the differential pressure holding damper, the time duration of the signal is counted and If the time continues, an abnormality is determined and an alarm is issued, and monitoring of the limit switch ON / OFF signal is started after the elapse of a predetermined time after the operation of the air conditioner is stopped, and the limit switch opens the differential pressure holding damper. When a signal corresponding to is issued, the duration of the signal is counted, and if the signal continues for a predetermined time, an abnormality is determined and an alarm is issued. Management method of the differential pressure holding the damper to

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