JPH059078Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a clean draft device for creating a dust-free and sterile clean working environment within the working space of a chamber body.

[Prior Art] Generally, by maintaining the space inside the chamber at a negative pressure, a draft chamber can exhaust gases that are generated in the working space inside the chamber and are not harmful to the human body without leaking into the room. With this structure, it is installed and used in laboratories, etc.

In addition, the clean bench has a structure that maintains positive pressure inside the chamber at all times by supplying clean air into the chamber, which is a local work space, and creates a clean environment in the space inside the chamber. It is installed and used in laboratories, etc.

On the other hand, the clean draft device according to the present invention is
This device was developed to have both the function of the draft chamber mentioned above and the function of a clean bench.While creating a dust-free and sterile clean work space inside the chamber, experiments can be carried out inside the chamber. It has a structure that allows all of the gases that are generated during various operations that are undesirable for the human body to be discharged to the outside without leaking them into a room such as a laboratory.

By the way, as mentioned above, the above-mentioned clean draft device having such a purpose must have both the functions of a draft chamber and a clean bench. If emphasis is placed on maintaining cleanliness, positive pressure must be maintained inside the chamber, and these contradictory requirements must always be met at the same time.

However, if the pressure inside the chamber is made negative, air from indoors such as laboratories will flow into the chamber, contaminating the clean air, and if the pressure inside the chamber is made positive, gases generated inside the chamber will enter rooms such as laboratories. etc., and contaminates the indoor environment.

The idea was to satisfy these conflicting demands at the same time by using HEPA
After being purified through various filters such as filters, it is sent from above into the working space of the chamber, and a part of the air that has been contaminated by the work is circulated back to the side of the various filters, repurified, and circulated to eliminate the contamination. A conventional method is to exhaust the remaining air.

In addition, as another conventional method, the outside air taken in is purified through various filters such as a HEPA filter, and then sent from above into the working space of the chamber. There is also a system in which the entire amount is exhausted to the outside through a .

[Problems to be solved by the invention] However, when using these conventional methods, it is difficult to block indoor air from flowing in through the openings provided for work needs. This resulted in a decrease in cleanliness within the work space, making it difficult to ensure complete work.

Furthermore, since the airflow inside the chamber was structured to flow from top to bottom, for example,
When it is necessary to place various equipment such as a heater on a work plate installed in the chamber and perform various operations such as heating a chemical solution in a container such as a beaker, the evaporated components, etc. will be carried downward by the air flow. This causes problems such as corrosion of various appliances such as heaters that come into contact with these evaporated components.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned problems seen in the conventional system, and its structural feature is that the chamber body has an opening on one side. A workbench in the processing chamber is connected to an air supply channel formed to forcefully feed clean air on the back side of the chamber body through the back side plate of the processing chamber. A supply branch path that allows air to blow out from the side, and a blowout branch path that allows air to blow out from a lower air outlet provided near the lower edge of the opening surface, and An exhaust flow path is formed in the upper part of the processing chamber so that air can be forcibly exhausted through at least an upper air outlet located above and opposite to the lower air outlet.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a cross-sectional view showing the schematic configuration of a clean draft apparatus as one embodiment of the present invention. A chamber body 1 contains a processing chamber 2 having an opening 6 on its front surface.

The processing chamber 2 is partitioned through the back plate 3, and includes a prefilter 16 for air purification and
Main filter 1 consisting of HEPA filter etc.
The outlet sides of a flow path system 20 which are branched from and communicated with an air supply flow path 15 formed by 7, etc. arranged in the flow path are respectively introduced.

That is, the flow path system 20, which is branched from and communicated with the air supply flow path 15 through which air is fed under pressure by an air supply fan (not shown) or the like, is connected to a large number of holes such as a punching board in the processing chamber 2. An air supply branch 18 which is divided by the workbench 4 having a small hole 5 and whose blowout side is introduced through the small hole 5 of the workbench 4, and the bottom of the opening surface 6 in the processing chamber 2. The lower air outlet 7 provided near the side edge is the air outlet side, and the outlet branch is connected to the lower air outlet 7 through a through hole 9 provided in the mounting plate 8 that covers the lower air outlet 7. A plurality of dampers 21 and 22 for adjusting the air volume are arranged at appropriate positions in each flow path as shown in FIG. It is now possible to adjust the air supply volume.

Of the flow path system 20, the air supply branch path 18, which is the side partitioned by the workbench 2, is
Since a drain pipe 23 is preliminarily installed on the bottom of the workbench 4, waste fluids generated as a result of various experimental work performed on the workbench 4, pure water, etc. can be supplied from the water tap 10, etc. In addition to being used as a sink to drain water to the outside, the workbench 4
By removing it, it can also be used as an appropriate cleaning tank. Furthermore, among the flow path system 20,
On the side of the spouting branch passage 19, a drain pipe 24 is similarly installed at an appropriate bottom surface in the flow passage.
For example, necessary maintenance work such as when removing the mounting plate 8 and washing away dirt in the flow path can be performed smoothly.

In addition, a prefilter 16 is provided at an appropriate position on the back side plate 3 of the processing chamber 2 to feed into the air supply flow path 15.
A maintenance opening 11 for attaching and detaching the main filter 17 is formed, and an appropriate opening/closing plate 1 such as a slide plate is inserted into this maintenance opening 11.
2 is attached in an airtight manner so that it can be opened/closed or attached/detached.

On the other hand, on the upper side of the processing chamber 2, there is an exhaust flow path 30 through which air blown up from below into the processing chamber 2 can be forcibly exhausted by an exhaust fan (not shown) or the like. are divided into sections.

That is, this exhaust flow path 30 is formed with at least an upper suction port 31 provided above and opposite to the lower air outlet 7, and if necessary, located above the workbench 4. The exhaust flow path 3 is connected from the processing chamber 2 to the exhaust flow path 3 through an exhaust port 33 whose opening area is variable using a slide damper 32, for example.
It is also possible to enable exhaust to 0 and keep it in communication.

Further, the opening surface 6 in the processing chamber 2 is formed to be air-lockable between a lower blow-off port 7 located below the opening surface 6 and an upper suction port 31 disposed above the opening surface facing the lower blow-off port 7. ing.

That is, from the lower air outlet 7, clean air supplied via the jetting branch passage 19 which is branched and communicated with the air supply passage 15 can be jetted upward, and on the other hand, The upper suction port 3
1, air can be forcibly taken in through the exhaust flow path 30, so an air curtain is formed between the lower blowout port 7 and the upper suction port 31, and the opening surface 6 is completely air-locked. can do.

In addition, the reference numeral 40 in the figure indicates an illumination light for providing the optimum illuminance for work inside the processing chamber 2, and 41 indicates an illumination lamp.
An opening/closing door for adjusting the opening area of the opening surface 6 as desired; 42 a damper for adjusting the amount of air supplied into the air supply channel 15; 43 a damper for adjusting the amount of air supplied into the air supply channel 15; The dampers used to adjust the displacement from the engine are shown.

Since the present invention is configured in this manner, clean air can be forcibly supplied from the air supply channel 15 via the main filter 17 or the like. In addition, this air supply flow path 15 has a branch air supply path 18 and a jetting branch path 19 that are branched and communicated with each other, so that air is blown up from the bottom to the top in the processing chamber 2. can supply clean air.

That is, clean air can be blown into the processing chamber 2 from the small holes 5 of the workbench 4 through the air supply branch path 18, and at this time, by adjusting the air volume adjustment damper 21, The wind can be blown into the processing chamber 2 by reducing the wind speed. Also,
Clean air can be ejected upward from the through hole 9 of the mounting plate 8 covering the lower air outlet 7 via the ejection branch path 19 . At this time, the amount of ejection can be adjusted by adjusting the air volume adjusting damper 22 provided in the flow path.

On the other hand, the clean air blown into the processing chamber 2 in this way can be forcibly taken in through the upper suction port 31, and the entire amount can be forcibly exhausted through the exhaust flow path 30. I can do it. In addition, when an exhaust port 33 is provided in the upper part of the processing chamber 2 and communicates with the exhaust flow path 30, this exhaust port 3
It is also possible to exhaust the air in the processing chamber 2 via 3.

At this time, depending on the degree of opening of the opening/closing door 42, even if room air from a laboratory or the like that may flow in through the opening surface 6 is taken in from the upper suction port 31, the workbench Since it is relatively far away from the station, it will not adversely affect the various operations performed on the workbench 2 under clean air.

Moreover, even if highly corrosive steam or gas is generated when heating chemicals etc. with the heater installed on the workbench 2 or performing necessary work using various instruments, these The corrosive components of the gas can be guided upward with the air flow and exhausted, so various equipment such as heaters may corrode due to contact with these gases, and various types of equipment that may occur due to the downward flow of steam or gas can be removed. The inconveniences can be effectively prevented.

[Effects of the invention] As described above, according to the invention, the opening provided in the chamber body can be completely air-locked and work can be performed under the supplied clean air, making it suitable for use in laboratories, etc. It is possible to reliably prevent air components that are undesirable for the human body from leaking indoors as a result of work. Moreover, the flow of clean air obtained in the processing room can be guided from below where the workbench is located to above it, so even if room air were to flow in, the flow of clean air could be carried out at the workbench etc. There is no negative effect on the work itself.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of the present invention, FIG. 2 is a front view of FIG. 1, and FIG.
It is a top view when looking down toward the workbench in the figure. 1...Chamber body, 2...Processing chamber, 3...
Back side plate, 4... Working table, 5... Small hole, 6... Opening surface, 7... Lower air outlet, 8... Placement plate, 9...
...Through hole, 10...Water tap, 11...Maintenance opening, 12...Opening/closing plate material, 15...Air supply channel, 1
6... Prefilter, 17... Main filter,
18...Air supply branch road, 19...Blowout branch road,
20... Channel system, 21, 22... Damper for air volume adjustment, 23, 24... Drain pipe, 30... Exhaust channel, 31... Upper suction port, 32... Slide damper, 33... Exhaust Road.

Claims (1)

[Scope of utility model registration request] A processing chamber having an opening on one side is formed in the chamber main body, and an air supply channel is formed to forcefully feed clean air on the back side of the chamber main body through the back side plate of the processing chamber. is a branch path for air supply that communicates with this to enable air to be blown from the workbench side of the processing chamber, and a lower air outlet provided near the lower edge of the opening surface that allows air to be blown from the side of the workbench of the processing chamber. A branch passageway for ejection is disposed in the upper part of the processing chamber, and the air can be forcibly evacuated through at least an upper suction port located above and opposite to the lower air outlet. A clean draft device characterized by forming an exhaust flow path.