JPH059079Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a draft chamber, and more specifically, to the design of a draft chamber for installing various auxiliary equipment necessary for various operations such as experiments in a processing chamber. Regarding a draft chamber with a greater degree of freedom.

[Prior Art] A draft chamber is a device installed in a chemical laboratory, etc. to ensure the safety and health of workers. It was developed with the intention of efficiently discharging toxic gases and other gases outside the laboratory through the working opening provided in the front of the chamber, without allowing them to leak into the laboratory.

Regarding the draft chamber used for this purpose, it is necessary to maintain negative pressure in the processing chamber at all times in order to prevent leakage of odors, toxic gases, etc. into the laboratory. However, keeping the processing chamber at negative pressure means that a large amount of expensive air-conditioned air that is supplied to the laboratory is also drawn in at the same time, which is an economical improvement. There was room for this.

In order to eliminate such inconvenience, the present applicant has already filed Utility Application No. 55-22219 (Utility Application No. 56-126241).
The draft chamber shown in Figures 3 and 4 was proposed as a draft chamber.

That is, according to FIG. 3, a processing chamber 32 having a working opening 33 on the front surface is defined above a workbench 34 disposed in the main body 31 via a peripheral wall 41. Above the opening 33 in the processing chamber 32, an air supply port 40 for forcefully feeding air downward has an opening width corresponding to the width of the opening 33, and an air supply path. 4
It has been established in connection with 2.

On the other hand, on the lower side of the opening 33, an intake port 35 for forcibly sucking the air forced downward from the air supply port 40 communicates with an exhaust path 44 via an intake path 38. , and is covered with a plate material 36 having a through hole 37.

Therefore, the air curtain formed between the air intake port 35 and the air supply port 40 causes
The opening 33 of No. 2 can be reliably shielded (hereinafter referred to as push-pull type), and the expensive air-conditioned air supplied into the laboratory does not need to flow into the processing chamber 32 through the opening 33. It was possible to effectively prevent the liquid from flowing into the water and being discharged, and in addition to the original function of the device, it also had an excellent effect in terms of economy.

[Problems to be solved by the invention] By the way, the push-pull type draft chamber described above has an air intake passage 38 disposed below the workbench 34 with a width corresponding to the width of the air intake port 35. The exhaust passage 44 is formed uniformly and communicates with an exhaust passage 44 having a similar width.

Therefore, as shown in FIG. 4, an intake passage 38 is disposed below the workbench 34 in the main body 31 so as to cover the entire surface thereof when viewed from above.

Therefore, the workbench 34 in the processing chamber 32
For example, a water faucet 4 as shown in the illustration is installed in a work space including
When ancillary equipment 47 such as a sink 46 having a diameter of 5 is to be installed, these are usually formed to have a predetermined depth, so that
This had to be installed under conditions where a portion of the flow path was partially blocked by penetrating a portion of the flow path.

This is a major factor that obstructs the smooth flow of air passing through the intake passage 38.
This is not a desirable phenomenon for a push-pull type draft chamber in which air is sucked in uniformly from the intake port 35 and the entire opening 33 is to be covered with an air curtain.

On the other hand, it is also necessary to install as many various auxiliary facilities 47 as possible in the work space including the workbench 34 so as to meet the various demands of the workers.

However, the more auxiliary equipment 47 is arranged in the work space including the workbench 34, the more the auxiliary equipment 47 obstructs the smooth flow of air flowing through the intake passage 38 located below. It reaches the end.

As a result, only the minimum necessary auxiliary equipment 47 can be provided in the work space including the workbench 34, resulting in a significant restriction in design freedom.

[Means for solving the problems] The present invention was made in view of the above-mentioned problems observed in the conventional push-pull type device, and its purpose is to improve the structure of the intake passage. An object of the present invention is to provide a push-pull type draft chamber that can greatly increase the degree of freedom in design for arranging various auxiliary equipment in a work space including a work table in a processing room. .

In other words, the structural feature of the present invention is that a working opening is provided in the front of a processing chamber that is partitioned above a workbench installed in the main body, and an air supply is provided above this opening. Air is forced downward from the mouth through an intake port provided at the bottom of the opening,
A draft chamber is connected to the air intake port and is capable of forming an air curtain in the opening by forcibly drawing air into the exhaust path through an air intake path arranged below the workbench. The intake passage includes a wide portion connected to an intake port that is opened and has a width corresponding to the width of the opening;
A narrow portion is provided on the back side of the processing chamber and is connected to an exhaust passage which is vertically provided and has a width narrower than the width of the opening.

[Function] For this reason, the air intake path located below the workbench is
Although it has a wide part on the starting end side connected to the intake port, the terminal end side connected to the exhaust path is formed as a narrow part, so there is a wide part below the workbench. It is possible to create a free space corresponding to the narrowing from the narrow part to the narrow part. Therefore, in the work space including the work table on the side of the processing chamber, it is possible to arrange various auxiliary equipment as well as the free space formed below the work table. Therefore, it is possible to increase the degree of design freedom when installing various auxiliary equipment in the work space including the workbench, and it can also be used as a draft chamber for the main body of the equipment to meet the end user's requests. It is possible to provide a structure that flexibly corresponds to the following.

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

FIG. 1 is an explanatory diagram showing a schematic configuration of a draft chamber as an embodiment of the present invention when viewed from the side.
A working opening 3 is provided at the front of the processing chamber 2 that is divided upwardly, and an air supply port 5 is provided above this opening 3, and an intake port 6 is provided below. Each has been established. Air is forced downward from the air supply port 5, and the air sucked in through the air intake port 6, which is covered by a plate 7 having a through hole 8, is interposed below the workbench 4. By forcibly discharging the air into the exhaust path 20 through the arranged intake path 9, an air curtain is formed in the opening 3 and can be blocked.

Further, the intake passage 9 includes a peripheral wall 10 defining the intake passage 9, and a wide portion 11 that is connected to an intake port 6 having a width corresponding to the width of the opening 3; The narrow part 12 is connected to the exhaust passage 20 which is vertically installed on the back side of the processing chamber 2 and has a width narrower than the width of the opening 3, so that the workbench 4 in the main body 1 can be It is formed leaving an extra space 13 on both left and right sides of the lower part.

FIG. 2 is a plan view showing a specific shape of the air intake passage 9 as an example, which has a wide portion 11 and a narrow portion 12, and shows the air intake port 6 located on the starting end side. The peripheral wall 10 located at the connecting portion of the inlet 6 has a wide portion 1 having a width corresponding to the intake port 6.
1 is formed. Further, a peripheral wall 10 located at a connection portion with the exhaust path 20 located on the terminal end side
A narrow portion 12 is formed with a width corresponding to the exhaust path 20.

On the other hand, the intake passage 9 is formed through the peripheral wall 10 consisting of such a wide part 11 and a narrow part 12.
is an inclined portion 15 in which the left and right side walls 14 of the peripheral wall 10 are inclined so as to gradually become narrower inward from the wide portion 11 located on the base end side thereof;
and a parallel portion 16 extending from the terminal end of the inclined portion 15 to the narrow portion 12 located on the terminal end side of the intake passage 9.

Although not shown in the drawings, of the peripheral wall 10 that partitions and forms the intake passage 9 having a wide part 11 and a narrow part 12, the left and right side walls 14 have a wall parallel to the rear half thereof. The wide part 11 without providing the part 12
It is also possible to form only an inclined part extending from the starting end of the narrow part 12 to the terminal end of the narrow part 12. Further, even if the intake passage 9 is provided with the inclined portion 15 and the parallel portion 16, the positional relationship thereof is not limited to the illustrated example, and even if the inclined portion 15 is made longer, Alternatively, a structure may be adopted in which the parallel portion 16 is made longer.

Since the present invention is configured in this way, even though the intake path 9 located below the workbench 4 has the wide portion 11 on the starting end side connected to the intake port 6, Since the terminal end side connected to the exhaust path 20 is formed as the narrow part 12, the lower part of the workbench 4 is formed from the wide part 11 to the narrow part 12.
A free space 13 corresponding to the narrowing can be created. Therefore, for the work space including the work table 4 on the side of the processing chamber 2, together with the free space part 13 formed below the work table 4,
In addition to making it possible to arrange auxiliary equipment 19 such as a sink 18 equipped with a water tap 17 as shown in the example shown in the figure, for example, although not shown, the height can be gradually lowered from the back to the front, and ultrasonic cleaning can be performed. Ancillary equipment 19 is provided in which a plurality of sinks are arranged by arranging devices, etc., and pure water is always fluidized from upstream to downstream, and used sequentially from the downstream sink to the upstream sink. This also makes it possible to clean base materials such as substrates.

Therefore, it is possible to increase the degree of design freedom when installing various incidental equipment 19 as described above in the work space including the workbench 4.
In addition to the function of the draft chamber as the main body of the device, it can be provided in large quantities or as a one-off product with a structure that flexibly meets the needs of end users.

Further, the intake passage 9 has a wide part 11 and a narrow part 1.
2, it is possible to eliminate the impeding factors that disturb the flow of air from within the flow path, and the air can be sucked uniformly from the air intake port 6 over the entire area, It is also possible to ensure that the opening 3 is shielded by the air curtain.

[Effects of the invention] As described above, according to the invention, even though the intake passage located below the workbench has a wide part on the starting end side connected to the intake port, the exhaust passage Since the end portion connected to the workbench is formed as a narrow portion, a free space corresponding to the narrowing from the wide portion to the narrow portion can be created below the workbench. Therefore, in the work space including the work table on the side of the processing chamber, it is possible to arrange various auxiliary equipment as well as the free space formed below the work table. Therefore, it is possible to increase the degree of design freedom when arranging various auxiliary equipment in the work space including the workbench, and it can also be used as a draft chamber for the main body of the equipment to meet the end user's requests. It is possible to provide a structure that flexibly corresponds to the following. In addition, the air intake path is formed by eliminating factors that impede the flow of air from within the flow path, so air can be drawn evenly from the intake port, and the opening is securely closed with an air curtain. can be shielded.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of an embodiment of the present invention, FIG. 2 is a plan view showing a schematic configuration of an intake passage in the embodiment of FIG. 1, and FIG. 3 is a diagram of a conventional device. FIG. 4, which is an explanatory diagram showing a schematic configuration, is a plan view showing a schematic configuration of an air intake passage in the conventional example shown in FIG. 3. 1...Main body, 2...Processing chamber, 3...Opening, 4
...Workbench, 6...Intake port, 9...Intake path, 10
...Peripheral wall, 11...Wide width part, 12...Narrow width part, 1
3...Free space section, 14...Side wall, 15...Slope section, 16...Parallel section, 19...Ancillary equipment.

Claims (1)

[Scope of Claim for Utility Model Registration] A working opening is provided in the front of the processing chamber that is partitioned above the workbench installed in the main body, and the air supply port provided above the opening opens downward. The air that is being pumped towards is communicated with the intake port provided below the opening, and is forced to be forced into the exhaust path via the intake path located below the workbench. In the draft chamber that makes it possible to form an air curtain at the opening by suction, the air intake path has a wide portion connected to an air intake port opened with a width corresponding to the width of the opening. and a narrow portion connected to an exhaust passage vertically disposed on the back side of the processing chamber and having a width narrower than the width of the opening.