JP2003019439A - Draft chamber air feed/exhaust system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute the above system in such a manner that the balance of a the air-intake and air volume displacement can be obtained regardless of the air-intake and air volume displacement of an air conditioner for indoor use when a plurality of draft chambers are installed in one chamber. SOLUTION: The exhaust air quantity from the respective chamber bodies 1, a plurality of which are arranged in one chamber are exhaust outside by one system of exhaust wind trunk (37) and the air-intake volume from outside is blown off from diffusers 43 into the room 3 by one system of air-intake wind trunk 49. The respective chamber bodies 1 are provided with opening/ closing control valves 31 for exhaust and opening/closing control valves 39 for air intake of which the valve opening degrees move to an open or close side in correspondence to the opening or closing of opening/closing doors 15. The quantity of the air intake appropriate for the air volume displacement is taken into the respective chamber bodies by the opening/closing control valves 31 for exhaust and the opening/closing control valves 39 for air intake are in correspondence to the opening and closing rates of the opening/closing doors 15, by which the respectively independently balanced air-intake and air volume displacement are obtained.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a draft chamber supply / exhaust system used in a laboratory or the like. 2. Description of the Related Art A draft chamber is used by being installed in a laboratory, a laboratory, or the like. A front opening of a working space formed inside a chamber main body can be opened and closed by an opening / closing door. On the other hand, in order to prevent harmful gases and the like from flowing back into the room from the front open port that is open during the experiment, a flow for taking in room air from the front open port is created, and air in the work space is removed. Means to exhaust air to the outside are taken. [0003] In the draft chamber during the experiment, indoor air is introduced into the working space from the front opening, and then exhausted to the outside. This means that the expensive conditioned air in the room is thrown away. [0004] In particular, when a plurality of draft chambers are installed in one room, the amount of exhaust air for exhausting indoor air to the outside increases, so that the balance between the amount of exhaust air and the amount of air supply tends to be lost. In this case, the ratio of the outside air load applied to the indoor air conditioner increases, the operation becomes almost 100% full operation, and there is a possibility that the air volume balance is disturbed and the indoor environment is disturbed. I can't do it. In addition, a running cost is required, which is not desirable in terms of cost. Accordingly, the present invention provides an air conditioner dedicated to a draft chamber separate from an air conditioner for room air conditioning even when a plurality of air conditioners are installed in one room, and a supply conditioned by the outside air conditioner. It is an object of the present invention to provide a draft chamber supply / exhaust system capable of achieving a balance between air volume and exhaust volume, and having excellent running cost and energy saving. [0006] In order to achieve the above object, according to a first aspect of the present invention, there is provided a chamber body having a plurality of chambers arranged in a single room and having a working space therein. An opening / closing door for opening and closing a front opening of the work space, and a system of exhaust air passages extending from the work space of each chamber body and communicating through a communication air passage to exhaust air in each work space to the outside. A system air supply passage for communicating conditioned air to each air outlet through an air supply communication air passage extended from each air outlet of each chamber main body, and the opening / closing door provided in the exhaust air communication air passage An exhaust opening / closing control valve that is controlled in a direction in which the valve opening is opened when the valve is opened in the opening direction and in a direction in which the valve opening is closed when the door is closed. In the direction in which the valve opening is opened when the opening and closing door is operated in the opening direction, An air supply opening / closing control valve, each of which is controlled in a direction in which the valve opening is closed when the opening / closing door is closed, an exhaust fan provided in the exhaust air path, and an external air conditioner provided in the air supply air path And controlling rotation of the exhaust fan based on a static pressure value in the exhaust air passage, while performing operation control of the outside air conditioner based on a static pressure value in a supply air passage. And Accordingly, when the opening height of the opening door is increased and the amount of air sucked into the work space is increased, the air in the work space corresponding to the amount is exhausted to the outside as the exhaust air amount.
At the same time, conditioned air having a supply air volume substantially equal to the exhaust air volume is blown out from the air outlet toward the room, so that each chamber body can obtain a balanced exhaust air volume and supply air volume independently. Further, when the opening height of the opening door is reduced and the amount of air sucked into the work space is reduced, the air in the work space corresponding to the amount is exhausted to the outside as the amount of exhaust air. At the same time, conditioned air having substantially the same air volume as the exhaust air volume is blown out from the outlet toward the room, so that each chamber main body can obtain the balanced exhaust air volume and supply air volume independently. At this time, by slowing the wind speed from the outlet,
The diffusion of the blown airflow into the room is reduced. As a result, the influence on the indoor environment is reduced, so that the outside air conditioner can blow air only by controlling the supply air temperature, thus consuming less energy. In addition, since the operation does not disturb the indoor temperature and humidity, the indoor air conditioner does not operate. The harmony device can be operated without running costs. Moreover, experiments under comfortable conditions can be continuously performed. An embodiment of the present invention will be specifically described below with reference to FIGS. 1 to 4. In FIG. 1, reference numeral 1 denotes a chamber main body of a plurality of draft chambers 5 installed in a room 3, in this embodiment five units. The interior of the chamber body 1 is a working space 11 partitioned by an upper ceiling surface 7 and a lower working surface 9 as shown in FIG.
Can be opened and closed by a sliding door 15 which is guided by left and right guide rails 14 and moves up and down. The opening / closing door 15 is made of a transparent glass plate so that the inside of the work space 11 can be seen from the outside, and a lower end portion is a handle portion 17 for manual operation. As shown in FIG. 3, one side of a wire 21 wrapped around a pulley 19 is connected to both sides of the upper end of the door 15, and a balance weight balanced with the door 15 is connected to the other of the wires 21. 23 are mounted. Thus, the opening / closing door 15 can be opened / closed with a light operating force by raising or lowering the handle portion 17 by hand. An exhaust communication air passage 25 and an air supply communication air passage 27 formed by ducts are provided between the ceiling surface 7 of the work space 11 and the upper space. The exhaust communication air passage 25 has an exhaust opening / closing control valve 31 inside, and one end thereof is connected to and connected to an exhaust suction port 33 provided on the ceiling surface 7. The other end of the exhaust communication air passage 25 protrudes outward from the upper space, and is connected to an exhaust air passage 37 provided with an exhaust fan 35 so that the air in each work space 11 passes through one system of the exhaust air passage 37. To be guided outside the room. The air supply communication air passage 27 has an air supply opening / closing control valve 39 inside, one end of which communicates with an air outlet 43 provided on a front panel 41 above the front opening 13, and an inner side. An outlet chamber 45 is provided. The other of the supply air passages 27 protrudes outward from the upper space, and is connected to an air supply passage 49 provided with an outside air conditioner 47 so that the outside air is supplied to each of the air outlets through a single supply air passage 49. 43. As shown in FIG. 1, the rotation of the exhaust fan 35 provided in the exhaust air passage 37 is controlled by the static pressure detecting means 51 based on the static pressure value of the exhaust air passage 37, and passes through each opening / closing door 15. The opening wind speed is controlled to be substantially constant. The outside air conditioner 47 provided in the supply air passage 49
Has a heat exchanger 55 and a fan 57 arranged in a case 53. For example, the heat exchanger 55 heats the cooling water from the cooling water tank 63 in summer and the heating water from the heating tank 65 in winter by the open / close proportional control of the two-way valve 61 controlled by the temperature sensor 59 provided inside the air supply passage 49. Water is supplied to each. Thus, heat is exchanged when the outside air taken in from the outside air inlet 67 by the rotation of the fan 57 passes through the heat exchanger 55, and is cooled as conditioned air or heated conditioned air. The air is supplied to the supply air passage 49. The operation of the fan 57 of the outside air conditioner 47 is controlled by the static pressure detecting means 69 based on the static pressure value of the supply air passage 49 so that the amount of exhaust air flowing through the exhaust air passage 37 is substantially equal to the amount of exhaust air. It is supposed to be. On the other hand, among the exhaust opening / closing control valve 31 and the air supply opening / closing control valve 39, the exhaust opening / closing control valve 31 is linked to the opening / closing operation of the opening / closing door 15 when the opening height H is large. When the opening is large and the opening height H is small, the opening and closing control is performed so that the valve opening becomes small. The opening / closing control valve 39 for the air supply is controlled to open and close so that the amount of air supplied is substantially the same as the amount of exhaust air controlled by the opening / closing control valve 31 for exhaust. More specifically, as shown in FIG.
1 and a position detection sensor 75 for detecting the opening height H of the opening / closing door 15 provided in an air flow measurement passage 71 opened between the upper space 1 and the upper space, respectively. Is controlled by a control unit 77 that performs an air volume calculation based on a detection signal from the controller. In the constant wind speed mode, the control unit 77
Based on the detection signals from the wind speed sensor 73 and the position detection sensor 75, it functions to calculate the optimal valve opening of the exhaust on-off control valve 31 and output a command signal for the valve opening. The position detection sensor 75 is a potentiometer whose resistance value changes in accordance with the vertical movement of the balance weight 23 as shown in FIG. The potentiometer is a wire 7 extending from the balance weight 23.
9 is wound around the winding pulley 83 via the rotating pulley 81, the rotational power of the rotating pulley 81 is transmitted via a transmission mechanism 85 including a worm and a worm wheel, and the amount of change in resistance at that time is opened. The information is input to the control unit 77 as height information. The air supply opening / closing control valve 39 is provided with a wind speed sensor 73.
And a control unit 77 that calculates the air volume based on a detection signal from the position detection sensor 75. Control unit 7
Reference numeral 7 designates an air supply opening / closing control valve 3 so that an air supply air amount substantially equal to an exhaust air amount flows through the air supply connection air passage 27 based on an input signal.
9 is controlled. The control unit 77 operates the constant air volume mode switch (not shown) of the operation panel in place of the constant air speed mode so that the opening height H of the opening / closing door 15 is not affected. A command signal for keeping the valve opening degree of the exhaust opening / closing control valve 31 and the air supply opening / closing control valve 39 constant is output, and a constant air volume mode is obtained. The draft chamber 5 configured as described above
According to the opening of the opening / closing door 15, a flow of the air in the room 3 toward the inside of the working space 11 is created in the front opening 13, and the air in each of the working spaces 11 flows through the exhaust air path 37 of one system. The air is exhausted through the room. At the same time air supply passage 4
The conditioned air is blown out from the outlet 43 of each chamber main body 1 to the room 3 via 9. At this time, in each chamber body 1, the open / close door 1
When the opening height H of the opening / closing door 5 is small, the exhaust opening / closing control valve 31 has a small valve opening degree, and when the opening height H of the opening / closing door 15 is large, the exhaust opening / closing control valve 31 has a corresponding opening degree. While being controlled to a large valve opening, the air supply opening / closing control valve 39 is controlled to a valve opening corresponding to the exhaust opening / closing control valve 31, so that a supply air volume substantially equal to the exhaust air volume flows. As a result, a balanced supply amount and exhaust amount can be obtained independently in each chamber body 1. At this time, the diffusion of the blown airflow into the room is reduced by reducing the speed of the blown air from the blowout port.
As a result, since the influence on the indoor environment is reduced, the outside air conditioner can blow air only by controlling the supply air temperature, and the energy consumption can be reduced, and the operation is performed without applying a load to the indoor air conditioner. Experiments can be performed under comfortable conditions even when a plurality of chamber bodies 1 are installed in one room. Moreover, the exhaust fan and the fan of the outside air conditioner are operated with the minimum required power, and the cooling water or heating water used in the outside air conditioner is also controlled to the required amount. Therefore, since the entire system is in energy-saving operation, operation with low running cost can be performed. As described above, according to the first aspect of the present invention,
According to the above, each of the plurality of chamber bodies installed in one room can perform an operation in which a balanced exhaust amount and an air supply amount can be independently obtained, so that the supply and exhaust amount balance is adjusted for indoor air. Energy consumption can be reduced because it is not necessary to rely on the harmony device. In addition, experiments can be performed under comfortable conditions, and operation can be performed with low running costs because only a minimum amount of energy is used.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall schematic explanatory diagram in which a plurality of draft chambers according to the present invention are installed in one room. FIG. 2 is a schematic sectional side view of a draft chamber according to the present invention. FIG. 3 is a schematic explanatory diagram of a position detection sensor. FIG. 4 is a schematic front view of a draft chamber. [Description of Signs] 1 ... Chamber main body 3 ... Room 11 ... Work space 13 ... Front opening 15 ... Open / close door 25 ... Exhaust communication air path 27 ... Supply communication air path 31 ... Exhaust open / close control valve 35 ... Exhaust fan 37 ... Exhaust air path 39 ... Air supply opening / closing control valve 47 ... Outside air conditioner 49 ... Air supply air path

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Claims (1)

Claims: 1. A plurality of chamber bodies arranged in one room and having a work space therein, an opening / closing door for opening and closing a front opening of the work space, and a work space of each chamber body. Through an exhaust air passage that extends from the exhaust air passage that extends from each chamber, and an air supply air passage that extends from each air outlet of each chamber body. A supply air passage that communicates conditioned air to each outlet through
Exhaust opening / closing control that is provided in the exhaust air passage and is controlled in a direction in which the valve opening is opened when the opening and closing door is operated in the opening direction, and in a direction in which the valve opening is closed when the opening and closing door is operated in the closing direction. A valve, which is provided in the air supply communication air passage and is controlled in a direction in which the valve opening is opened when the opening and closing door is operated in the opening direction, and in a direction in which the valve opening is closed when the opening and closing door is operated in the closing direction. An open / close control valve for air, an exhaust fan provided in the exhaust air path, and an external air conditioner provided in the supply air path, and the exhaust gas is set to a static pressure value in the exhaust air path. A draft chamber supply / exhaust system, wherein the rotation of the outside air conditioner is controlled based on a static pressure value in a supply air passage while controlling the rotation based on the rotation.