JPH01107851A - Method and device for blowing and exhausting in draft chamber - Google Patents

Abstract

PURPOSE:To eliminate the need for considering wind area velocity in the case of introducing air through the aperture face of a treatment chamber and to extremely inhibit discharge of air-conditioned air and to make work environment comfortable by performing air lock with an air curtain device. CONSTITUTION:The passage system of a chamber main body 1 is constituted of a draft air duct 16 for air-locking the front aperture face of a treatment chamber 2, a suction path 10, a first air feed path 12 for returning one part of air to the chamber 2, a second air feed path 15 for discharging the residual part of air to an exhauxt path 14 and this exhaust path 14. When total amount discharged from the exhaust path 14 is regulated to 100, blowing amount via the draft air duct 16 is regulated to 50-80 and suction amount sucked through the suction path 10 is regulated to introduction amount in a range within both 50-80 via the duct 16 and 10-35 from an outside 21. 25-75 of this suction amount is returned to the chamber 2 via the air feed path 12 and also when the residual amount of suction amount discharged via the air feed path 15 is defined as A, amount obtained by subtracting A from total exhaust amount 100 is discharged through the exhaust port 8 of the chamber 2 as exhaust amount to the path 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air exhaust force method in a draft chamber and an apparatus therefor.

[Prior art] Traft chambers are devices installed in chemical laboratories to ensure the safety and health of workers, and are used to diffuse odors and toxic gases generated by chemical experiments into the laboratory. It can be efficiently discharged outdoors without any waste.

FIGS. 2 and 3 show structural examples of conventionally used raft chambers.

Among these, the one shown in FIG. 2 has a chemical experiment ring and a processing chamber 31 for conducting various experiments in the chamber main body 30 with an opening 32 arranged in the front thereof, and also has a ceiling section of the processing chamber 31. An exhaust port 33 equipped with a damper 34 is provided at the rear side of the processing chamber 3I, and an exhaust path 35 communicating with the processing chamber 31 at its lower part is provided on the back side of the processing chamber 3I. The structure is such that contaminated air within the processing chamber 31 can be forcibly exhausted by a blower (not shown) through an upper space 36 where air exhausted from the port 33 joins. Therefore, the entire amount of air to be discharged is taken in at a predetermined surface wind velocity from the opening 32 of the processing chamber 31 that communicates with the external space such as the laboratory, and the air generated in the processing chamber 31 due to experiments, etc. Both the contaminated air and the contaminated air were forced out.

On the other hand, the one shown in FIG. 3 is an air curtain system based on the conventional structure shown in FIG. 2, and further includes an opening 38 facing downward at the upper part of the outer front surface of the chamber body 30!
It has a structure in which Ff37 is installed. Therefore, part of the exhaust volume can be supplemented with outside air by the air pumped through the opening 38, so that the air conditioned from the external space such as the laboratory that is taken in through the opening 32 of the processing chamber 31 is reduced. The amount of air intake could be reduced accordingly.

[Problems to be Solved by the Invention] By the way, among the above-mentioned conventional devices, the device having the structure shown in FIG. It is necessary to take in air through the opening surface 32 of the processing chamber 31 at a surface wind speed and forcefully exhaust it. Therefore, in order to obtain the desired surface wind speed, a blower capable of quickly responding to this is required. ,
The amount of expensive air conditioned air discharged increases, which not only poses a problem in terms of energy conservation, but also requires a large amount of cost to install facility equipment.

Furthermore, since the device with the structure shown in FIG. 3 is equipped with an air curtain device 37, the above-mentioned problems found in the device with the structure in FIG. 2 can be improved to a considerable extent; When a person performs experimental work using the processing chamber 31, the person is exposed to the outside air blown out from the opening 38 of the air curtain device 37 from above. Therefore, especially in summer and winter when there is a large temperature difference between the indoor temperature and the outdoor temperature, there is a problem in that the worker is forced to perform experimental work in an uncomfortable working environment because of the temperature difference.

[Object of the Invention] The present invention has been made in view of the above-mentioned problems observed in conventional devices, and its purpose is to take in air from the opening surface of the processing chamber by air locking with an air curtain device. Eliminates the need to consider the actual surface wind speed, and
It is an object of the present invention to provide a tray chamber capable of suppressing the discharge of conditioned air as much as possible and providing a preferable working environment for experiments.

[Means for Solving the Problems] The present invention has been made to achieve the above objects, and a first aspect of the present invention is that the flow passage system in the chamber body connects the front opening surface of the processing chamber with air. An air blowing passage for locking, an air intake passage for mainly sucking in the air that is pressurized from this air blowing passage, and a first air passage for circulating a part of the air sent from this air intake passage back to the processing chamber. an air passage, a second air passage that guides the remainder of the air sent out from the intake passage to an exhaust passage, and an exhaust passage that communicates with the processing chamber via an exhaust port, and this exhaust When the total amount of air discharged from the air passage is 0, the amount of air blown to the front opening of the processing chamber via the air passage is 50 to 80, and the amount of air intake from the intake passage is 50 to 80. ~80, 10 from outside
The intake amount is in the range of ~35, and the intake amount is 25 to 75.
is returned to the processing chamber via the first air supply path, and the exhaust amount to the exhaust path is equal to The configuration is characterized in that air is discharged from the exhaust port in an amount equal to the total exhaust amount, which is 100 minus A.

Further, the second invention provides a processing chamber having an opening surface on the front surface disposed in the chamber main body, an upper exhaust port, a lower exhaust port, and an inner side of the opening surface facing toward the workbench. and an air curtain device capable of air locking, and below the processing chamber partitioned by the workbench, the intake side of the blower is connected to an intake path having an intake port opened at the front side of the workbench, A flow path system is arranged in which the air supply side is connected to a first air supply path having an air supply port opened in the processing chamber and a second air supply path connected to an exhaust path communicating with the processing chamber. There is a structural feature in the fact that it was established.

[Example] Hereinafter, the present invention will be described in detail based on the drawings.

FIG. 1 is a cross-sectional view showing a schematic configuration of a draft chamber as an embodiment of the present invention.
A processing chamber 2 having an opening surface 5 on the front surface and a flow path system 3 located at a lower position and partitioned by a work table 4 in the processing chamber 2 are disposed therein.

Of these, the processing chamber 2 includes an air curtain device 6 that can air lock the opening surface 5, an upper exhaust port 8, and a lower exhaust port 13. By passing through the opened blow-out lower, outside air that is forced into the air passage 16 by a blower (not shown) is blown out, and the opening surface 5 arranged at the front of the processing chamber 2 can be air-locked, and the flow passage Preferably, a filter 22 is disposed therein for rectifying and purifying the air flow. Further, if necessary, a damper 23 for sending air into the processing chamber 5 may be provided so as to be able to open and close. The upper exhaust port 8 provided in the processing chamber 2 is provided to mainly discharge relatively light gas generated within the processing chamber 2, and the lower exhaust port 13 is provided to discharge relatively light gas generated within the processing chamber 2. These are provided mainly to discharge relatively heavy gas generated in the processing chamber 2, and are connected to the exhaust passages 14 provided on the back side of the processing chamber 2, and dampers 18 and 19 are attached to each of them. has been done.

Further, on the front side of the workbench 4 in the processing chamber 2, an intake port 9 communicating with an air intake passage 10 forming a flow path system 3, which will be described later, is provided on the left and right side walls of the processing chamber 2. Air supply ports 11 each have a wind direction control plate 17 that communicates with a first air supply path 12 of a flow path system 3 to be described later.

In addition, the reference numeral 20 in the figure indicates a front door, and the reference numeral 24 indicates a damper disposed at the terminal end of the exhaust path 14.

On the other hand, in the flow path system 3, the air intake side of the interposed blower F is connected to an air intake path 10 having an air intake port 9 opened at the front side of the workbench, and the air curtain is External space 2 such as a laboratory that is air-conditioned with the air blown out from the device 6! The air inside the processing chamber 2 can be effectively sucked in while partially taking in the air inside the processing chamber 2, and the opening surface 5 of the processing chamber 2 can be air-locked (hereinafter, such an air lock method is referred to as a "push-pull structure"). ). Further, the air supply side of the blower F includes a first air supply path 12 having an air supply port 11 opened in the processing chamber 2 and an air volume control plate 25 provided in the flow path, and the exhaust path 12. is conducted to,
Moreover, it is branched and connected to a second air supply path 15 having an air volume control plate 26 in the flow path, and the air supply port 1! A part of the air sucked from the intake port 9 can be sent into the processing chamber 2 through the second air supply path 15 connected to the exhaust path 12. It is also used in part to promote efficient ventilation.

In addition, in the apparatus of the present invention, the air inlet 11 provided in the processing chamber 2 is provided not only on the left and right side walls of the processing chamber 2 as shown in the illustrated example, but also at a desired appropriate location such as the back side. You can also do that. Further, a damper having an appropriately structured structure may be provided in the flow path system 3 such as the intake path 10, if necessary.

Next, a method for blowing and exhausting air as an example in the thus configured raft chamber will be described.

The entire flow path system in the chamber body 1 includes an air passage 16 for air-locking the opening surface 5 provided at the front of the processing chamber 2, and an air passage 16 for mainly inhaling the air pressure-fed from this air passage 16. An air intake passage 10, a first air supply passage 12 for recirculating a part of the air sent from the intake passage 10 to the processing chamber 2, and an exhaust passage I4 for discharging the remainder of the air sent from the intake passage 10. and an exhaust path 14 communicating with the processing chamber 2 via the upper exhaust port 8 and the lower exhaust port 13.

When the total amount of exhaust from this exhaust path 14 is assumed to be 100.

The amount of air blown to the opening surface 5 of the processing chamber 2 through the air duct 16 is 50 to 80. More preferably, 70 is blown.

Furthermore, the intake passage 10 has a push-pull structure.
The amount of air taken in from the air passage 16 is in the range of 50 to 60, the external space 21 such as a laboratory, or 610 to 35, more preferably, the intake amount is from the air passage 16 to 70, and the external space 21 to 30. Inhale. 25 to 75 of this intake air amount,
More preferably, the gas 40 is returned to the processing chamber 2 via the first air supply path 12.

In addition, the total amount of exhaust sent to the exhaust path 14 (already 10
0), when the remaining amount of intake air drawn out via the second air supply path 15 is A, the amount from the upper exhaust port 8 and the lower exhaust port I3 of the processing chamber 2 is Exhaust by discharging an amount of air equal to 100 minus A.

Since the present invention employs the push-pull structure as described above, the air ejected from the ejection lower that has reached the vicinity of the inlet 9 can be efficiently sucked in from the inlet 9. Air can effectively flow in and out between the processing chamber 2 and an external space 21 such as a laboratory where the chamber main body l is installed, through the opening surface 5 located at the front and blocked by an air curtain. It can be air-locked to prevent expensive, conditioned air inside the laboratory from being discharged to the outside unnecessarily.

In addition, since it has a push-pull structure, the air discharge from the processing chamber 2 depends on the type of experiment being conducted and the speed of the air flow from the external space 21 flowing in through the opening surface 5 of the processing chamber 2. Since the settings can be made uniformly at all times without considering the relationship with surface wind speed), the selection of the blower (not shown) can also be made uniformly. Furthermore, although it is said that the opening surface 5 of the processing chamber 2 is placed in an airlock state due to the push-pull structure, a portion of the air from the external space 21 side and the processing chamber 2 side may be taken in at the same time. This also makes it possible to form an air curtain with less air turbulence.

Furthermore, a part of the intake air that has passed through the intake path 10 can be returned to a desired direction inside the processing chamber 2 through the first air path 12 and from the air inlet port having the wind direction control plate 17. As a result, air containing contaminated gases generated from experiments, etc., is carried along with this recirculated air flow and is more efficiently carried out from the upper exhaust port 8 and, in some cases, from the lower exhaust port 13. It can be discharged from Furthermore, the remainder of the intake air that has passed through the intake path 10 can be sent out to the exhaust path 12 via the second air supply path 15, so that the number of ventilations in the processing chamber 2 can be increased.

[Effects of the Invention] As described above, according to the present invention, by providing a flow path system having a push-pull structure in the chamber main body, the processing chamber can be opened by sucking air blown out from the air curtain device. Since the opening surface can be air-locked, the intake and release of conditioned air from outside spaces such as laboratories can be significantly reduced, and the load on the exhaust fan can be reduced, resulting in even greater energy savings. In addition to this, a part of the air taken in through the intake port can be recirculated into the processing chamber, allowing it to be efficiently discharged together with the contaminated air inside the processing chamber, and the remainder can be removed from the exhaust path. It is also possible to increase the number of times the air in the processing chamber is ventilated by exhausting the air through the process chamber. Furthermore, since the air curtain device is provided inside the chamber main body,
Since outside air is not blown directly over the worker's head, experiments can be conducted under favorable environmental conditions.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing an example of the device of the present invention, and FIGS. 2 and 3 are schematic cross-sectional views showing an example of a conventional device. l... Chamber body, 2... Processing chamber, 3... Channel system, 4... Work table, 5... Opening surface, 6... Air curtain device, 7... Spout port , 8... Upper exhaust port, 9...
-Intake port, 10...Intake path. 11... Air supply port, 12... First air supply path, I
3...Lower exhaust port, 14...Exhaust path, 15...
-Second air supply path, 16...Air supply path, 17...Wind direction control board, 18.19...Damper. 20...Front door, 21...External space, 22
...Filter, 23.24-...Damper,
25, 26... Air volume control board, F... Blower Figure 1 1 Chamber body 2 Processing chamber 6 Channel system 4 Workbench 5 Opening surface 6
Air curtain device 7, blowout port 8, upper exhaust port 9, intake port 10...intake path 11, air supply port 12, first air supply path 16, and lower exhaust port
14 Exhaust passage 15...Second air supply passage Fig. 2 Fig. 3

Claims (1)

[Claims] 1. The flow path system in the chamber main body includes an air blowing path for airlocking the front opening surface of the processing chamber, and an air intake path for mainly sucking the air pressure-fed from this air blowing path. , a first air supply path for causing a part of the air sent out from the intake path to flow back into the processing chamber, and a second air supply path for leading the remainder of the air sent out from the intake path to an exhaust path. and,
Consisting of an exhaust path communicating with the processing chamber via an exhaust port, and when the total amount of exhaust from this exhaust path is 100,
The amount of air blown to the front opening of the processing chamber through the air duct is 50 to 80, and the amount of air taken in from the air intake path is 50 to 80 from the air duct and 10 to 35 from the outside. 25 to 75 of this intake air amount is returned to the processing chamber through the first air supply path, and the exhaust amount to the exhaust path is equal to the intake air amount derived through the second air supply path. A method for blowing and exhausting air in a draft chamber, characterized in that when the remaining amount is A, air is exhausted from the exhaust port of the processing chamber in an amount obtained by subtracting A from the total exhaust amount of 100. 2. The processing chamber, which is arranged in the chamber body and has an opening surface on the front side, has an upper exhaust port, a lower exhaust port, and an air lock that allows the inside of the opening surface to be turned toward the workbench. An air curtain device is provided, and an air intake side of a blower is connected to an air intake path having an intake port opened at the front side of the work bench, and an air supply side is connected to the lower part of the processing chamber divided by the work bench, and the air supply side is connected to an air intake passage having an intake port opened in the front side of the work bench. A flow path system is provided that is connected to a first air supply path having an air supply port opened in the process chamber and a second air supply path connected to an exhaust path communicating with the processing chamber. draft chamber.