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Room pressure controlling system

A control system and room pressure technology, applied in heating and ventilation control systems, ventilation systems, heating and ventilation safety systems, etc., can solve problems such as room pressure control obstruction, achieve the effects of reducing the number of operations, prolonging life, and reducing costs

Active Publication Date: 2014-12-03
YAMATAKE HONEYWELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In case of failure of the valve responsible for the PCV function, it will greatly hinder the control of the room pressure

Method used

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  • Room pressure controlling system
  • Room pressure controlling system
  • Room pressure controlling system

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Experimental program
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Embodiment Construction

[0025] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 is a diagram showing the configuration of the room pressure control system according to the embodiment of the present invention, and Figure 8 The same components are assigned the same reference numerals. The room pressure control system of this embodiment is composed of: a fume hood 101 arranged in the room 100; a local exhaust pipeline 102; an air supply pipeline 103; a common exhaust pipeline 104; a local exhaust valve EXV; an air supply valve MAV; Common exhaust valve GEX; controllers 105, 106, 107; communication line 108; differential pressure sensor 109 for measuring the pressure difference between the room 100 and the specified reference room (in this embodiment, the space outside the room 100); And a room pressure monitor 110 for checking the pressure differential.

[0026] figure 2 is a block diagram showing a configuration example of the controller ...

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PUM

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Abstract

A room pressure controlling system having a local exhaust valve, a supply air valve, a common exhaust air valve, controllers and a differential pressure sensor. The controller calculates a correction control output value for the valve operated as the room pressure controlling valve, which is either the supply air valve or the common exhaust air valve, based on a setting value and a room pressure measured by the differential pressure sensor. The controller evaluates whether or not the supply airflow rate and / or the exhaust airflow rate is changing, and if an airflow rate is changing, emphasizes rapid responsiveness of the room pressure control than a reduction in the frequency of actuation of the room pressure controlling valve, if the airflow rate is stable, the controller emphasizes the reduction in the frequency of actuation of the room pressure controlling valve than the rapid responsiveness of the room pressure control.

Description

technical field [0001] The present invention relates to a room pressure control system for keeping the room pressure constant by controlling the air supply air volume and exhaust air volume in the room. Background technique [0002] Biochemical substances harmful to human body are often produced during the experimental operation in chemical experiments. The fume hood is one of the devices to prevent the diffusion of these biochemical substances into the room and prevent pollution to the human body. Generally, a fume hood is equipped with the enclosure (casing) with the sash which can be opened and closed up and down or left and right, and the operator of a laboratory can access the inside of a casing from this sash. In order not to expose an operator who is operating in a fume hood to harmful biochemicals, the enclosure is connected to a local exhaust duct that removes biochemicals. [0003] The room pressure control system is a system that adjusts the local exhaust duct i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F7/00F24F11/00B08B15/04
CPCF24F2011/0042F24F11/04B08B15/023F24F2110/40F24F11/74
Inventor 藤村隆司大曲康仁大村林太郎
Owner YAMATAKE HONEYWELL CO LTD