JPH0460795B2 - - Google Patents

Description

[Detailed Description of the Invention] [Subject of the Invention] The present invention relates to a safety cabinet that handles biologically harmful microorganisms or physicochemically harmful substances, and is used to prevent contaminants from flowing out from working openings. Regarding a suitable workbench.

[Prior art]

One example of conventional equipment is as described in JP-A-57-150377, and since highly dangerous microorganisms and chemical substances are handled in the work space, these devices are not allowed in the work space. It is considered to be an area contaminated by harmful substances. In conventional devices, equipment for work within a work space is carried in and out through a work opening formed in the front of the work space. Therefore, when large equipment is carried in and out, the formation of an air curtain at the work opening is hindered, and there is a risk that contaminants within the work space may flow out of the work space.

In addition, as another related matter, JP-A-57-
No. 83274, which discloses a configuration in which adjacent safety cabinets are connected by a connection port and a partition plate is provided only at one opening of the connection port. There is no structure in which an object storage space is formed in the object storage space and a first opening/closing means and a second opening/closing means are provided on both sides of the object storage space.
Therefore, when carrying an object into or out of the safety cabinet via the connection port, at least one of the first opening/closing means and the second opening/closing means is closed to open the object storage space to the outside. cannot be isolated once. Therefore, the structure of JP-A-57-83274 was simply changed to JP-A-57-83274.
- When combined with No. 150377, air from outside the workbench will flow into the workbench from the connection port during loading and unloading, reducing the amount of air flowing in from the opening in front of the workbench, impairing the air curtain effect. There is a problem. As mentioned above, JP-A-57-150377,
JP-A No. 57-83274 does not disclose anything about the protection of air curtains during loading and unloading of equipment.

[Purpose of the invention]

An object of the present invention is to have an opening in which an air curtain is formed on the front surface, and a laminar flow is supplied to the inside so that either one of the openings is selectively opened to a working space maintained at negative pressure. By providing a housing with first and second opening/closing means, the air curtain protects the work area during loading and unloading of equipment to prevent contaminated materials from leaking from the opening, improving safety and reliability. Our goal is to provide an excellent workbench.

[Summary of the invention]

The present invention provides a work space that has a first opening on the front surface and is kept at a negative pressure inside, and a width of the work space that is arranged facing the work space so as to supply clean air to the work space. the first having a width approximately equal to
an air suction port formed below the opening to draw in the air supplied into the work space from the first filter and outside air to form an air curtain in the first opening; and a second filter for purifying and exhausting the air sucked in from the air suction port, the workbench having at least one of the side and back surfaces of the work space distinguished from the first opening. a casing mounted on the second opening; a first opening/closing means for partitioning between the inside of the casing and the work space; It is characterized in that it has a second opening/closing means for partitioning a space outside the work space, and the first opening/closing means and the second opening/closing means are configured such that one of them is selectively opened. That is.

[Embodiments of the invention]

Examples of the present invention will be described below.

Both sides and the back of the workbench 1 are surrounded by walls 2, forming a workspace 3. A window 4 is provided in front of the work space 3. Lower edge of window 4 and workbench 1
An opening 5 serving as a first opening is provided between the two. A suction port 6 is provided in front of the workbench 1. A chamber 7 is formed below the workbench 1, and a blower 8 for introducing outside air through an opening 5 and a suction port 6 is provided in the chamber 7.

The back and ceiling of the work space 3 have a double structure, forming a passage 9 that guides the air discharged by the blower 8 to the ceiling.

Openings 10 and 11 are provided in the ceiling wall, respectively.
High performance filters 12 and 13 are provided here, respectively.

A part of the air discharged by the blower 8 is discharged to the outside through a high-performance filter 12, and a part is sent into the work space 3 through a high-performance filter 13 and a discharge port 15.

The air sent into the work space 3 enters the chamber 7 through the suction port 6 and the communication hole 14 provided at the rear of the work table 1, and is circulated by the blower 8.

The configuration of the three parts of the work space described above is shown in FIG.
In this embodiment, a second opening 5 is provided on the side surface of the work space 3 of the safety cabinet configured as described above to distinguish it from the first opening 5.
As shown in FIG.
A casing 16 is installed in the opening of the casing 16 and serves as a space for temporarily storing a communication path that communicates the inside and outside of the work space 3 and an object passing through this communication path, and A first partition between the inside of the casing 16 and between the inside of the casing 16 and the outside air.
A second opening/closing means 16a and a second opening/closing means 16b are provided.

In this safety cabinet, a filter 13 is installed above the work space 3 so as to face the work space 3, and the filter 13 has a width approximately equal to the width of the work space 3 (width in the left-right direction in FIG. 2). In this way, a plurality of filters can be combined. Clean air is supplied to the work space 3 in a laminar flow from the outlet 15 at the bottom of the filter 13. In addition, a part of this clean air is sucked into the suction port 6 along with the air outside the work space 3 at the lower front of the work space 3, so this safety cabinet has airflow from the air outlet 15 to the suction port 6, and an opening. The airflow from the outside world to the suction port 6 through the part 5 has a function of preventing contaminants handled in the work space 3 from leaking to the outside world. Opening 5 for large equipment, etc.
If the equipment is brought into the work space 3, the air flow will be disturbed due to this equipment, and there is a risk that the contaminated material in the work space 3 will leak to the outside world.Therefore, a method is adopted to handle the contaminated material after the equipment is brought in. was. Furthermore, when equipment was to be carried out, the contaminants in the work space 3 had to be removed first. In the safety cabinet to which the present invention is applied, a housing 16 having a first opening/closing means 16a and a second opening/closing means 16b apart from the opening 5 is provided between the air outlet 15 and the suction opening 6. By the method described, it became possible to carry in and out equipment without passing through the opening 5.

When carrying equipment into the work space 3, the first opening/closing means 16a is closed and the second opening/closing means 1 is opened.
Equipment is carried into the housing 16 from 6b. Then the second
The first opening/closing means 16b is closed, and then the first opening/closing means 1 is closed.
6a and carry the equipment into the work space 3.

When carrying out the equipment, the second opening/closing means 16b
In the closed state, the first opening/closing means 16a is opened and equipment is carried into the housing 16. Subsequently, the first opening/closing means 16a is closed to remove contaminants, and then the second opening/closing means 16b is opened to carry out the equipment. This results in
Even if large equipment is brought into work space 3 or taken out from work space 3,
Since at least one of the opening/closing means 16a and the second opening/closing means 16b is closed, it is possible to prevent air from flowing into the work space 3 from the housing 16. Therefore, even during loading and unloading, the amount of air flowing in from the opening 5 can be kept constant, and the working space 3 can be kept constant.
The formation of an air curtain at the opening 5 is not hindered.

Further, in this embodiment, the airflow in the work space 3 is made to be in a laminar flow state, so that it is possible to prevent the diffusion of dust from the equipment carried into the work space 3. Furthermore, when the first opening/closing means 16a is opened between the work space 3 and the case 16 as a case to carry in or take out equipment, the negative pressure in the work space 3 causes contaminants to be removed from the case 16. Even if it flows out into the work space 3, the laminar flow prevents it from spreading and contamination within the work space 3 can be prevented.
Furthermore, the first opening/closing means 16a and the second opening/closing means 1
A sealable hinged door supported by a hinge so as to be openable and closable is generally used as the opening/closing door 6b, but when the first opening/closing means 16a is opened, the negative pressure in the work space 3 causes negative pressure in the housing 16 as well. , second opening/closing means 16
b is sucked into the work space 3, improving the degree of sealing between the housing 16 and the housing 16, preventing contaminants from entering the housing 16 from outside, and improving reliability.

Next, FIG. 3 shows an example in which a plurality of safety cabinets 18 of the present invention are connected. When performing a series of operations on materials in a cabinet, the conventional method is to use a large cabinet with space for storing the equipment necessary for the operation and a space for performing the operations, and to use multiple cabinets. It is conceivable to use separate cabinets and move the material out of the openings and into the other cabinets. In this case, if a large cabinet with the space necessary for storing and working equipment is manufactured anew each time, the economic burden will be greater than that of a general product because it is a custom-made product. It will be done. Furthermore, in the method of using a plurality of cabinets, in which materials are once taken out of the cabinet and then moved to another cabinet, there is a possibility that dangerous materials inside the cabinet are also taken out at the same time as the materials are taken out.

In the method of the present invention, since cabinets each having a certain capacity of work space are connected by the housing 16, the necessary space for work can be obtained by connecting a plurality of cabinets, and the above-mentioned problems can be solved. It can be solved.

Furthermore, in the clean air outlet section, when the device is enlarged, conventionally, when attaching a plurality of punching plates 22 to the outlet provided in the case 21, a flat plate is simply bent as shown in FIG. Since only one mounting frame 23 was used, there was a drawback that the air flow was obstructed and a turbulent flow portion 27 was generated.

In addition, as shown in FIG. 5A, the punching plate 22'
A method has been used in which the rising portion 22'a of the punching board is made larger and no mounting frame is provided, but as shown in FIG. It had the disadvantage of detracting from its aesthetic appearance.

To solve this problem, when attaching the punching plate 22 to the air outlet portion of the dust-free sterilization device main body 21, a ventilation portion may be provided in the attachment frame using an attachment frame. An example of the shape of the mounting frame is shown in FIG. The mounting frame includes a frame main body part 24, a ventilation hole 25 made in the main body part, and a punching plate mounting hole 26.
Consisted of.

In the embodiment shown in FIG. 6, the clean air produced by the main body 21 is blown out directly through the punching plate 22 at the outlet portion, and at the same time, it is blown out through the punching plate 22 through the ventilation hole 25 of the mounting frame, and is blown out through the laminar flow section 28. form.

As a result, clean air is also blown out from the mounting frame, which reduces the occurrence of turbulence downstream of the mounting frame 24, and at the same time, since the punching plate 22 is fixed, the step d caused by distortion etc. during installation is eliminated. It becomes possible to maintain the beauty.

Furthermore, since the generation of turbulent flow is reduced, it is possible to improve the cleanliness inside the device.

Note that the opening provided in this mounting frame may be a plurality of slits or a round hole.

Further, this mounting frame is not limited to the workbench of the present invention, but may be used for air purifying devices such as filter units and clean rooms.

〔Effect of the invention〕

According to the present invention, the air curtain has an opening in which an air curtain is formed on the front surface, and one of the openings is selectively opened to a working space in which a laminar flow is supplied inside and maintained at a negative pressure. By providing a housing with first and second opening/closing means, it is possible to prevent contaminants from leaking from the openings in the work space by protecting the air curtain during loading and unloading of equipment, ensuring safety and reliability. You can get an excellent workbench.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing the configuration of a work space portion of a safety cabinet in an embodiment of the present invention;
Fig. 2 is a front view of an embodiment of the present invention, Fig. 3 is a front view of a case where a plurality of safety cabinets shown in Fig. 2 are connected in series, and Fig. 4 is a front view of an air outlet section using a conventional mounting frame. 5A is a sectional view of the blowing part without using a mounting frame, FIG. 5B is an enlarged sectional view of part A in FIG. 5, and FIG. 6 is an installation in an embodiment of the present invention FIG. 7 is a longitudinal sectional view of the air outlet section when a frame is used, and a plan view showing an example of the shape of the mounting frame according to the present invention. Explanation of symbols, 1... workbench, 3... work space,
5...Opening, 6...Suction port, 8...Blower, 1
6... Housing, 16a... First opening/closing means, 16b
...Second opening/closing means.

Claims (1)

[Claims] 1. A work space that has a first opening in the front and whose interior is kept under negative pressure, and a work space that is arranged facing the work space so as to supply clean air to the work space and that is approximately equal in width to the work space. a first filter having a width, and a first filter formed below the opening so as to draw in air supplied into the work space from the first filter and outside air to form an air curtain in the first opening. In a workbench equipped with an air suction port and a second filter that purifies and exhausts the air sucked in from the air suction port, the first filter is provided on at least one of the side and back surfaces of the work space. A housing having a second opening provided separately from the opening, a housing attached to the second opening, a first opening/closing means for partitioning between the inside of the housing and the work space, and the housing. A second opening/closing means is provided for partitioning between the inside of the casing and a space outside the work space, and either one of the first opening/closing means and the second opening/closing means is selectively opened. A workbench characterized by comprising: