JP2008241162A - Exhaust system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust system stable in an operation state, by preventing failure of a production device, while reducing equipment cost. <P>SOLUTION: Respective exhaust systems 12 have an exhaust pipe 22 arranged in a room 1 and respectively communicated with an exhaust dust 13, and a built-in fan 23 for blowing air in the room 1 to the exhaust pipe 22. An exhaust fan 14 is arranged in the exhaust duct 13 so as to exhaust air from the built-in fan 23 of the respective exhaust systems 12 to the outside of the room via the exhaust pipe 22 and the exhaust duct 13. A pressure avoiding damper 15 is arranged in the exhaust duct 13 so as to exhaust the air inside of the exhaust duct 13 when pressure inside of the exhaust duct 13 rises and reaches predetermined upper limit pressure. An intake damper 16 is arranged in the exhaust duct 13 so as to supply the air to the inside of the exhaust duct 13 when the pressure inside of the exhaust duct 13 lowers and reaches predetermined lower limit pressure. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an exhaust system.

  Conventionally, in a supply / exhaust system used in a factory or the like where a plurality of production devices are installed indoors, an exhaust device is provided for each production device, and the exhaust from each exhaust device is exhausted to the outside through one duct. ing. However, in this case, since the amount of exhaust differs depending on the number of exhaust devices in operation, there is a problem that the exhaust pressure in the duct is not constant and the production device is broken.

  In order to solve this problem, as shown in FIG. 3, a pressure sensor 52 is installed in the duct 51, and the exhaust fan 53 provided in the duct 51 is inverter-controlled based on the pressure detected by the pressure sensor 52. A system for adjusting the exhaust air volume has been proposed (see, for example, Patent Document 1). In addition, as shown in FIG. 4, there is also a system that adjusts the exhaust air volume by controlling a motor damper 63 provided to open and close the duct 61 based on the pressure detected by the pressure sensor 62 installed in the duct 61. is there.

JP 63-190650 A

  However, the conventional systems as shown in FIGS. 3 and 4 require a control power source, and the control electronic circuit is complicated and expensive, which causes a problem of increased equipment costs. In addition, if the supply from the control power supply is stopped due to a power failure or failure, or if the control electronic circuit breaks down, there is a problem that the exhaust air volume cannot be adjusted and the production apparatus is damaged. There is also a problem that the operation state may become unstable depending on the installation position of the pressure sensor.

  The present invention has been made paying attention to such a problem, and can provide an exhaust system that can reduce equipment costs, can prevent a failure of a production apparatus, etc., and has a stable operation state. It is an object.

  In order to achieve the above object, an exhaust system according to the present invention includes an exhaust duct, a plurality of exhaust devices, an exhaust fan, a pressure-proof damper, and an intake damper, and the exhaust duct communicates with the outside. The exhaust device is disposed indoors, and has an exhaust pipe communicating with the exhaust duct and a built-in fan for blowing the indoor air to the exhaust pipe, and the exhaust fan is the built-in fan of each exhaust device The exhaust duct is provided in the exhaust duct so as to exhaust the air from the outside through the exhaust pipe and the exhaust duct, and the pressure-reducing damper increases the pressure inside the exhaust duct and reaches a predetermined upper limit pressure. Provided in the exhaust duct so as to exhaust the air inside the exhaust duct, and the intake damper is configured so that the internal pressure of the exhaust duct is reduced when the pressure inside the exhaust duct decreases and reaches a predetermined lower limit pressure. That is provided in the exhaust duct to supply air to, and features.

  In the exhaust system according to the present invention, when the pressure inside the exhaust duct reaches a predetermined upper limit pressure, the air inside the exhaust duct is discharged by the pressure avoidance damper, so the pressure inside the exhaust duct is always kept lower than the upper limit pressure. can do. Further, when the pressure inside the exhaust duct reaches a predetermined lower limit pressure, air is supplied to the inside of the exhaust duct by the intake damper, so that the pressure inside the exhaust duct can always be kept higher than the lower limit pressure. As described above, the pressure inside the exhaust duct can be adjusted between the lower limit pressure and the upper limit pressure by the pressure avoidance damper and the intake damper, so that the operation state of the exhaust fan is stabilized and the production apparatus or the like is prevented from malfunctioning. can do.

  By configuring the pressure avoidance damper and the intake damper with a check damper that opens and closes mechanically by the pressure difference between the inside and outside of the exhaust duct, the upper limit pressure and the lower limit pressure are set according to the pressure difference in advance, and the inside of the exhaust duct The pressure of can be adjusted. This eliminates the need for a power source for the pressure-reduction damper and the intake damper, an electronic circuit for control, and the like, so that the equipment cost can be reduced.

  In the exhaust system according to the present invention, the exhaust duct includes a plurality of branch pipes, each branch pipe is provided to communicate with one or a plurality of the exhaust pipes, and the pressure-proof damper includes a plurality of branch pipes. It may be provided in the tube. In this case, each branch pipe can be adjusted to a pressure lower than the upper limit pressure. For this reason, the pressure inside an exhaust duct can be made constant and damage to an exhaust duct, a production apparatus, etc. can be prevented.

  The exhaust system according to the present invention may include one or a plurality of chambers to which one or a plurality of the exhaust pipes are connected, and the exhaust duct may communicate with the exhaust pipes of the respective exhaust devices via the chambers. Good. In this case, since the exhaust from each exhaust device is temporarily stored in the chamber, a sudden change in pressure inside the exhaust duct can be suppressed.

  According to the present invention, it is possible to reduce the facility cost, to prevent a failure of the production apparatus or the like, and to provide an exhaust system with a stable operating state.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show an exhaust system according to an embodiment of the present invention.
As shown in FIGS. 1 and 2, the exhaust system includes a chamber 11, a plurality of exhaust devices 12, an exhaust duct 13, an exhaust fan 14, a pressure-proof damper 15, and an intake damper 16.

As shown in FIG. 1, a plurality of chambers 11 are provided near the ceiling of the room 1.
Each exhaust device 12 is disposed in the room 1 and is provided so as to correspond to the plurality of production apparatuses 2 disposed in the room 1. Each exhaust device 12 includes an exhaust port 21, an exhaust pipe 22, a built-in fan 23, a backflow prevention valve 24, and the like. The exhaust pipe 22 communicates with the exhaust port 21 and extends to the chamber 11 or the ceiling. One or a plurality of exhaust pipes 22 extending to the chamber 11 communicate with the inside of the chamber 11 and are connected to one chamber 11. The built-in fan 23 is provided in the middle of the exhaust pipe 22 so as to suck the air in the room 1 from the exhaust port 21 and send it to the exhaust pipe 22. The backflow prevention valve 24 is provided in the middle of the exhaust pipe 22 downstream from the built-in fan 23 so as to prevent the air in the exhaust pipe 22 from backflowing.

  As shown in FIG. 1, the exhaust duct 13 is arranged outside and communicates with the outside, and has a plurality of branch pipes 25. Each branch pipe 25 is connected to a chamber 11 provided in the room 1 or an exhaust pipe 22 not connected to the chamber 11. The exhaust duct 13 communicates with the exhaust pipe 22 of each exhaust device 12 through each branch pipe 25 via the chamber 11 or directly without passing through the chamber 11.

  As shown in FIG. 1, the exhaust fan 14 is provided at one end of the exhaust duct 13. The exhaust fan 14 sends the air from the built-in fan 23 of each exhaust device 12 to the processing device 26 through the exhaust pipe 22 and the exhaust duct 13 without passing through the exhaust pipe 22, the chamber 11 and the exhaust duct 13. It is like that.

  As shown in FIG. 1, the pressure-reducing damper 15 is composed of a plurality, and each is provided in each branch pipe 25. The pressure avoidance damper 15 is composed of a check damper that mechanically opens and closes due to a pressure difference between the inside and the outside of each branch pipe 25 of the exhaust duct 13. As shown in FIG. 2, the pressure avoidance damper 15 has a preset upper limit pressure when opening and a pressure avoidance closing pressure when closing. The upper limit pressure is set to atmospheric pressure, and the avoidance pressure closing pressure is set to a pressure lower than the upper limit pressure. The pressure avoidance damper 15 opens when the pressure inside the branch pipe 25 increases and reaches the upper limit pressure (A in FIG. 2), and opens until the pressure inside the branch pipe 25 drops to the pressure avoidance closing pressure. When the pressure inside the branch pipe 25 is reduced to the avoidance pressure closing pressure (B in FIG. 2), the valve is closed.

  As shown in FIG. 1, the intake damper 16 is provided at the other end with respect to the exhaust fan 14 of the exhaust duct 13. The intake damper 16 is composed of a check damper that mechanically opens and closes due to a pressure difference between the inside and the outside of the exhaust duct 13. As shown in FIG. 2, the intake damper 16 is preset with a lower limit pressure when the intake damper 16 is opened and an intake closing pressure when the intake damper 16 is closed. The lower limit pressure is set to a pressure lower than the upper limit pressure, and the intake closing pressure is set to a pressure lower than the upper limit pressure and higher than the lower limit pressure. The intake damper 16 opens when the pressure inside the exhaust duct 13 decreases and reaches the lower limit pressure (C in FIG. 2), and opens until the pressure inside the exhaust duct 13 rises to the intake closing pressure. When the pressure of the exhaust duct 13 rises to the intake air closing pressure (D in FIG. 2), it is closed.

Next, the operation will be described.
In the exhaust system according to the embodiment of the present invention, when the internal pressure of the exhaust duct 13 reaches a predetermined upper limit pressure, the internal pressure is discharged from each branch pipe 25 by the pressure avoidance damper 15. Can always be kept below the upper limit pressure. Further, when the pressure inside the exhaust duct 13 reaches a predetermined lower limit pressure, the internal pressure can always be maintained higher than the lower limit pressure by supplying air into the exhaust duct 13 by the intake damper 16. . As described above, the pressure inside the exhaust duct 13 can be adjusted between the lower limit pressure and the upper limit pressure by the pressure avoidance damper 15 and the intake damper 16, so that the operating state of the exhaust fan 14 is stabilized and the backflow is prevented. Failure of the valve 24, the production apparatus 2, etc. can be prevented. For this reason, the exhaust fan 14 can be continuously operated regardless of the number of operating production apparatuses 2 and the operation schedule.

  Since the pressure avoidance damper 15 and the intake damper 16 are composed of check dampers, the internal pressure of the exhaust duct 13 can be adjusted by setting the upper limit pressure and the lower limit pressure in advance based on the pressure difference. This eliminates the need for a power supply for the pressure damper 15 and the intake damper 16, an electronic circuit for control, wiring therefor, and the like, and can reduce equipment costs and wiring work costs.

  Since the pressure avoidance damper 15 is provided in each branch pipe 25, the pressure can be adjusted to a pressure lower than the upper limit pressure for each branch pipe 25. For this reason, the pressure inside the exhaust duct 13 can be made constant, and damage to the exhaust duct 13 and the production apparatus 2 can be prevented.

  In the case where the exhaust duct 13 communicates with the exhaust pipe 22 via the chamber 11, the exhaust from each exhaust device 12 is temporarily stored in the chamber 11, so that a sudden pressure change inside the exhaust duct 13 is caused. Can be suppressed.

  Even if the production apparatus 2 is added, the exhaust pipe 22 of the exhaust apparatus 12 may be connected to the chamber 11 or the exhaust duct 13, and the entire system need not be changed. For this reason, it is easy to change the system, and the cost is low. A plurality of exhaust fans 14 may be provided.

1 is an overall schematic diagram showing an exhaust system according to an embodiment of the present invention. It is a graph which shows the time change of the pressure inside the exhaust duct of the exhaust system shown in FIG. It is a whole schematic diagram which shows the exhaust system by the conventional inverter control. It is a whole schematic diagram which shows the exhaust system by the conventional motor damper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Indoor 2 Production apparatus 11 Chamber 12 Exhaust apparatus 13 Exhaust duct 14 Exhaust fan 15 Depressurization damper 16 Intake damper 21 Exhaust port 22 Exhaust pipe 23 Built-in fan 24 Backflow prevention valve 25 Branch pipe 26 Processing apparatus

Claims (3)

An exhaust duct, a plurality of exhaust devices, an exhaust fan, a pressure-proof damper, and an intake damper;
The exhaust duct communicates with the outside of the room,
Each exhaust device is disposed indoors, and has an exhaust pipe communicating with the exhaust duct, and a built-in fan for blowing air in the room to the exhaust pipe,
The exhaust fan is provided in the exhaust duct so as to exhaust air from the built-in fan of each exhaust device to the outside through the exhaust pipe and the exhaust duct,
The pressure avoidance damper is provided in the exhaust duct to discharge air inside the exhaust duct when the pressure inside the exhaust duct rises and reaches a predetermined upper limit pressure,
The intake damper is provided in the exhaust duct so as to supply air into the exhaust duct when the pressure inside the exhaust duct decreases and reaches a predetermined lower limit pressure,
Features an exhaust system. The exhaust duct has a plurality of branch pipes, and each branch pipe is provided to communicate with one or a plurality of the exhaust pipes,
The pressure-proof damper is composed of a plurality, each provided on each branch pipe,
The exhaust system according to claim 1, wherein: Having one or more chambers connected to one or more said exhaust pipes;
The exhaust duct communicates with the exhaust pipe of each exhaust device through the chamber.
The exhaust system according to claim 1 or 2, characterized in that the exhaust system.

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