JP2007061750A - Draft chamber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a draft chamber capable of opening and shutting doors by both up-and-down and right-and-left movement as well as obtaining a stream of intake air having a constant predetermined wind speed without reverse flow if an open area is varied. <P>SOLUTION: The draft chamber is characterized in that: an open area of a front opening 3 in the up-and-down direction, an open area of a front opening 3 in the right-and-left direction and an exhaust airflow amount are determined according to a detected signal from an up-and-down opening position sensor 31, a detected signal from a right-and-left opening position sensor 33 and a detected signal from an exhaust airflow detection sensor 43 respectively by a control part 15; comparison operations are carried out with respect to determined information of the open area in the up-and-down direction to that of the exhaust airflow amount or determined information of the open area in the right-and-left direction to that of the exhaust airflow amount respectively; and an exhaust airflow adjusting means 11 is controlled according to when the front opening is opened in the up-and-down direction or in the right-and-left direction respectively so that the intake air having a predetermined wind speed always flows into a working room. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a draft chamber.

  In general, the interior of the draft chamber is created in an experimental work space. The front opening of the work space can be opened and closed by a transparent door, and the inside can be seen from the outside through the door.

  The opening area of the front opening during the experiment is not opened entirely, but the opening area is limited by the opening / closing door, and the opening area is wide enough to allow the operation of the experimental instruments and the like in the work space.

The reason why the opening area is limited by the opening / closing door without opening the front opening to the entire surface is, for example, to protect the experimenter from toxic gas generated in the work space during the experiment. Specifically, the opening area of the front opening is limited by the open / close door, while the suction air flow from the front opening to the inside work space is created, so that toxic gas generated during the experiment This prevents backflow from the front opening to the room.
Japanese Patent No. 2801864

  The flow of the suction air from the front opening to the inside work space is created by forcibly exhausting the air in the work space to the outside by an exhaust device. It is the set wind speed value. Since the front opening at this time has a standard opening area, if the opening area is changed, the wind speed value of the suction air also changes. For example, if the opening area is limited to be small during the experiment, the passage area is reduced correspondingly, and the wind speed of the suction air increases. On the other hand, it is known that if the opening area of the front opening is increased, the passage area is correspondingly increased, and the wind speed of the suction air becomes slower, especially during the experiment. In the case of opening, the flow of the suction air becomes slow, causing a problem that, for example, harmful gas or the like flows backward into the room.

  In addition, since the change in the flow of the suction air during the experiment affects the atmosphere around the experiment area, it may be difficult to obtain data under the same conditions.

  Accordingly, an object of the present invention is to provide a draft chamber which can always obtain a set suction air flow even when the opening area of the front opening is changed.

  In order to achieve the above object, according to the present invention, an openable / closable door for opening and closing a front opening of the work space in the vertical and horizontal directions is provided in a chamber body having a work space inside, and the opening and closing thereof. Exhaust air volume adjusting means that creates a flow of suction air from the front opening to the work space when the door is opened and forcibly exhausts the suction air to the outside through the exhaust duct, and the vertical direction of the door A detection signal from an upper and lower opening position sensor for detecting the upper and lower opening position, a detection signal from a left and right opening position sensor for detecting a left and right opening position in the left and right direction of the door, and an exhaust wind speed for detecting an exhaust wind speed flowing through the exhaust duct And a control unit to which detection signals from the detection sensors are respectively input. The control unit determines the opening area in the vertical direction of the front opening by the detection signal from the vertical opening position sensor. The opening area in the left and right direction of the opening is determined by the detection signal from the direction position sensor, the exhaust air volume is determined by the detection signal from the exhaust air speed detection sensor, and the calculated opening area information and exhaust air volume information in the vertical direction or Calculating the wind speed value of the suction air at each opening area from the direction opening area information and the exhaust air volume information, and controlling the exhaust air volume adjusting means so that the air speed value is the same as the set suction air speed value It is characterized by.

  According to the present invention, it is possible to obtain a front opening having an opening area opened in the vertical direction by the opening and closing door. In addition, since the front opening opening of the opening area opened in the left-right direction can be obtained by the opening and closing door, experiment with the most suitable opening state of the front opening corresponding to various experiments by selecting each front opening Work can be done.

  In addition, when the front opening has an opening area opened in the vertical direction, or when the front opening has an opening area opened in the left-right direction, the flow of the intake air set by the function of the exhaust air volume adjusting means can be obtained. it can.

  As a result, during the experiment, for example, even if the front opening is wide open, the set suction air flow corresponding to the opening change is secured, and the backflow of harmful gas from the front opening is reliably prevented. , To ensure the safety of the experimenter. Moreover, the experiment can be performed under the same conditions where the flow of the suction air does not change.

  In the present invention, first, the control unit calculates the wind speed value of the suction air of the combined opening area from the combined opening area information obtained by combining the opening area in the vertical direction and the opening area in the horizontal direction and the exhaust air volume information. However, by controlling the exhaust air volume adjusting means so that the wind speed value becomes the same as the set wind speed, the harmful gas generated during the experiment can flow backward from the front opening to the indoor side. Stop without fail.

  Second, by providing the exhaust wind speed detection sensor in a sensor duct, one end of which is connected to the exhaust duct and the other end being opened to the atmosphere, no corrosive gas or the like that causes defects is directly touched. Like that.

  Thirdly, by setting the exhaust air volume adjusting means as an open / close control valve that is provided in the exhaust duct and controls the flow of the exhaust air, the flow of the set intake air is secured with a simple structure.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 5.

  FIG. 1 is a schematic explanatory diagram of the entire draft chamber according to the present invention. The interior of the draft chamber main body 1 is a work space for performing an experiment, and the front opening 3 of the work space has an open / close door 5 and the upper part is a ceiling provided with an exhaust duct 7.

  The exhaust duct 7 is connected to and communicated with an extension duct 9 extended to the outside as indicated by a virtual line, and an open / close control valve 11 serving as an exhaust air volume adjusting means is provided inside. The extension duct 9 is provided with an exhaust device 13, and by operating the exhaust device 13, for example, as shown in FIG. 3, a flow of suction air a from the front opening 3 toward the internal working space is created. It has become.

  The opening / closing control valve 11 is rotated when a signal from a control unit 15 described later is input to the drive unit 17, so that the duct passage width of the exhaust duct 7 can be expanded or reduced. Thereby, for example, by rotating the duct passage width of the exhaust duct 7 in the direction of reducing, the flow of the suction air a is set to be slow in proportion thereto.

  Further, by rotating the duct passage width of the exhaust duct 7 in the direction of expanding, the flow of the suction air a is set to be proportionally faster.

  The open / close door 5 has a structure in which a pair of sliding door type open / close bodies 23 slidable to the left and right with respect to a frame body 21 that is framed in a vertically moving square guided by the left and right guide rails 19 is provided. .

  The upper and lower parts of the frame body 21 are in a relationship between a duck and a sill, and the opening / closing body 23 is assembled so as to be slidable left and right. As shown in FIG. 2, one side of a wire 27 wound around a pulley 25 is coupled to both sides of the frame body 21 and a balance weight 29 is coupled to the other side of the wire 27, respectively. The open / close door 5 can be moved up and down. The vertical movement position of the open / close door 5 can be detected by the vertical opening position sensor 31.

  The opening / closing body 23 is made of two transparent glass plates so that the inside can be seen, and can be opened and closed on the right half or the left half by sliding left and right. The left and right sliding openings of the opening / closing body 23 can be detected by a left / right opening position sensor 33.

  The vertical opening position sensor 31 is a potentiometer whose resistance value changes in accordance with the vertical movement of the balance weight 29 as shown in FIG. In the potentiometer, the wire 35 extended from the balance weight 29 is wound around the winding pulley 39 via the rotating pulley 37, so that the rotational power of the rotating pulley 37 is transferred via the conduction mechanism 41 composed of a worm and a worm wheel. The amount of change in the resistance value at that time is input to the control unit 15 as upper and lower opening position information.

  The left and right opening position sensor 33 includes a plurality of sensor portions S1, S2, and S3 arranged along the upper end portion of the frame body 21. When the opening and closing body 23 slides, the slide opening position of the opening and closing body 23 is detected. The opening position information is input to the control unit 15.

  In this case, by providing a large number of sensor portions S1 of the left and right opening position sensor 33, it is possible to detect a continuous fine opening state, but since the opening width is generally determined to some extent by experiments, it is detected intermittently. Even if it is a means to do, it can plan without trouble.

  The control unit 15 is configured so that a detection signal from the exhaust wind speed detection sensor 43 is input to the input side in addition to the detection information from the vertical opening position sensor 31 and the detection information from the left and right opening position sensor 33.

  The exhaust air speed detection sensor 43 detects the flow of exhaust air in the exhaust duct 7 and is installed in the sensor duct 45. One end of the sensor duct 45 is in continuous communication with the exhaust duct 7 in a state where a part of the passage is restricted, and the other end is open to the room 47.

  Therefore, when the exhaust air flows through the exhaust duct 7, the exhaust duct 7 becomes a negative pressure region V <b> 1 with respect to the atmospheric pressure V in the room 47, thereby creating a flow from the room 47 into the exhaust duct 7. As a result, detection can be performed without contact with a corrosive gas or the like that causes a failure.

  The flow of air toward the exhaust duct 7 changes in proportion to the speed of the exhaust air flow. For example, when the flow of exhaust air becomes faster, the flow in the sensor duct 45 toward the exhaust duct 7 also becomes faster. By detecting the flow toward the exhaust duct 7, the flow of the exhaust air, that is, the flow of the intake air a is detected. I can know.

  Specifically, the exhaust wind speed detection sensor 43 is a wind speed sensor for examining the wind speed value flowing in the sensor duct 45, and the wind speed value detected by the wind speed sensor is input to the control unit 15 as exhaust wind speed information.

  As described above, the control unit 15 receives the detection signal from the vertical opening position sensor 31, the detection signal from the left and right opening position sensor 33, and the detection signal from the exhaust wind speed detection sensor 43 on the input side. However, when the detection signal from the vertical opening position sensor 31 is input, the vertical opening area of the front opening 3 is calculated from the detection signal, and when the detection signal from the left and right opening position sensor 33 is input, the detection is performed. When a function for calculating the opening area in the left-right direction of the front opening 3 from the signal and a combination detection signal from the vertical opening position sensor 31 and the left and right opening position sensor 33 are input, the combination opening of the front opening 3 from the detection signal A function for determining the area and a function for determining the amount of exhaust air from the detection signal when the detection signal from the exhaust air speed detection sensor 43 is input.

  The opening area P can be obtained from the position obtained from the detection signal by inputting in advance dimension information of either the vertical H or the horizontal L from the position obtained by P = H × L where vertical: H and horizontal: L. It is possible to determine the opening area by multiplying with information.

  On the other hand, the control unit 15 is preliminarily input with the air velocity value of the suction air that has been set at the time of the standard opening area, and the calculated opening area information and exhaust air volume information in the vertical direction and the opening information and exhaust air volume in the left and right direction. The opening / closing control calculates the wind speed value of the suction air at each opening area from the information, the combined opening area information and the exhaust air volume information, and the wind speed value becomes the same as the preset suction air speed value inputted in advance. It has a function of controlling the opening and closing of the valve 11.

  Thereby, the flow of the suction | inhalation wind of the wind speed always set corresponding to the opening area of the said opening 3 is ensured.

  According to the draft chamber configured as described above, when the lowermost opening / closing door 5 in the fully closed state is raised, the front opening 3 having an opening area opened up and down as shown by the hatched area in FIG. 3 is obtained. . At this time, the open / close control valve 11 is actuated by a signal from the control unit 15, and a flow of the suction air a having a set wind speed toward the work space is always obtained. As a result, the backflow of harmful gas generated inside does not occur. Similarly, if one of the opening / closing bodies 23 constituting the lowermost opening / closing door 5 in the fully closed state is slid to the left, for example, as shown in the shaded area in FIG. Mouth 3 is obtained.

  At this time, the open / close control valve 11 is actuated by a signal from the control unit 15, and a flow of suction air having a set wind speed toward the work space is always obtained. Similarly, after raising the lowermost opening / closing door 5 in the fully closed state, the opening / closing body 23 constituting the opening / closing door 5 is slid left and right to open the combination opening area as shown by the hatched area in FIG. A front opening 3 is obtained.

  At this time, the open / close control valve 11 is actuated by a signal from the control unit 15 so that it is possible to always obtain a flow of suction air having a set wind speed toward the work space, and backflow of harmful gas from the front opening 3. To ensure the safety of the experimenter. In addition, the experiment can be performed under the same conditions where the flow of the suction air does not change.

  In addition, by selecting the front opening 3 having an opening area opened in the vertical direction, an opening area opened in the horizontal direction, and a combination opening area combining the two, the most suitable front opening corresponding to various experiments is selected. Experimental work can be performed with the mouth 3 open.

  In the present embodiment, the exhaust air volume adjusting means has been described as the open / close control valve 11, but it may be a means for directly controlling the operation of the exhaust device 13 within a strong and weak range.

BRIEF DESCRIPTION OF THE DRAWINGS Outline explanatory drawing of the whole draft chamber concerning this invention. The outline explanatory view of an up-and-down opening position sensor. The schematic explanatory drawing which showed the state in which the front opening | mouth was opened to the up-down direction. The schematic explanatory drawing which showed the state by which the front opening | mouth was opened in the left-right direction. FIG. 3 is a schematic explanatory diagram showing a combined opening state in which the front opening is vertically and horizontally.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chamber main body 3 Front opening 5 Opening door 7 Exhaust duct 11 Opening / closing control valve (exhaust air volume adjustment means)
DESCRIPTION OF SYMBOLS 13 Exhaust apparatus 15 Control part 21 Frame body 23 Opening / closing body 31 Vertical opening position sensor 33 Left and right opening position sensor 43 Exhaust wind speed detection sensor 45 Sensor duct

Claims (4)

  An openable / closable door that opens and closes the front open port of the work space in the vertical and horizontal directions in the chamber body having an internal work space, and suction from the front open port into the work space when the open / close door opens. Exhaust air volume adjusting means for forcibly exhausting the intake air to the outside through the exhaust duct and a detection signal from the vertical opening position sensor for detecting the vertical opening position in the vertical direction of the door And a control unit to which a detection signal from a left / right opening position sensor that detects a left / right opening position in the left / right direction of the open / close door and a detection signal from an exhaust wind speed detection sensor that detects an exhaust wind speed flowing through the exhaust duct are respectively input. The control unit has an opening area in the vertical direction of the front opening by a detection signal from the vertical opening position sensor, and the opening by the detection signal from the horizontal position sensor. Each of the left and right opening areas is determined by the detection signal from the exhaust air speed detection sensor, and each of the calculated vertical opening area information and exhaust air volume information, or the left and right opening area information and exhaust air volume information. A draft chamber characterized by calculating a wind speed value of the suction air in an opening area and controlling the exhaust air volume adjusting means so that the wind speed value is the same as the set suction wind speed value.   The control unit calculates a wind speed value of the suction air of the combined opening area from the combined opening area information and the exhaust air volume information combining the opening area in the vertical direction and the opening area in the left and right direction, and the suction air in which the wind speed value is set 2. The draft chamber according to claim 1, wherein the exhaust air volume adjusting means is controlled so as to be equal to the wind speed value.   2. The draft chamber according to claim 1, wherein the exhaust air velocity detection sensor is provided in a sensor duct having one end connected continuously to the exhaust duct and the other end opened to the atmosphere indoors.   2. The draft chamber according to claim 1, wherein the exhaust air volume adjusting means is an open / close control valve provided in the exhaust duct for controlling the flow of exhaust air.

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