JPH04895Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to a draft chamber used in laboratories and the like.

(Prior art) In general, a draft chamber used for various experiments and tests has a vertically movable opening/closing door made of transparent tempered glass installed at the entrance of the laboratory; An air outlet is provided along the opening/closing door to blow out air taken in from the outside from top to bottom. Furthermore, the laboratory is structured to have an exhaust port that guides and discharges air taken into the laboratory from the entrance to the outside via a duct.

(Problem that the invention aims to solve) As mentioned above, the air blown out from the air outlet flows into the laboratory room and is exhausted from the outlet, which prevents harmful gases generated during the experiment from flowing back toward the worker. I've learned not to.

The air outlet is provided to blow out air taken in from outside from the point where the draft chamber is used in the air-conditioned room, so as not to have a large effect on the air in the air-conditioned room. Therefore, during operation, air always flows from the top to the bottom of the inlet, but depending on the experiment, the opening/closing door may be lowered and stopped halfway, leaving the lower part of the inlet open. However, since the lower end of the door is provided with a handle that extends longitudinally and protrudes outward, the air that descends along the door hits the handle, causing the flow to become turbulent and turbulent at the bottom end of the door. A flow was occurring. If a vortex or turbulent flow occurs, there is a risk that the intake of air may be obstructed or, in some cases, the gas may flow back toward the operator.

Therefore, the object of this invention is to provide a draft chamber that can obtain a smooth air flow without generating turbulence by using a simple device.

[Structure of the invention] (Means for solving the problem) In order to achieve the above-mentioned purpose, this invention includes a laboratory chamber formed within the draft chamber body, and upper and lower sections for opening and closing the entrance of the laboratory chamber. It has a movable sliding door, an air outlet installed above the sliding door that blows out air from top to bottom, and an outlet that guides and discharges the air taken into the laboratory to the outside through a duct. A handle section continuous in the longitudinal direction is provided at the lower end of the slide door, and the inner surface of the handle section serves as a guide surface through which air blown out from the outlet is guided into the laboratory room.

(Function) According to such a draft chamber, the air blown out from the air outlet descends along the sliding door, and then is smoothly guided into the laboratory by the guide surface of the handle. You will be able to do it. Therefore, no vortices or turbulence are generated, and there is no possibility that the gas in the laboratory will flow back toward the operator.

(Embodiment) Hereinafter, one embodiment of this invention will be described in detail with reference to the drawings of FIGS. 1 to 4.

In the figure, reference numeral 1 indicates the main body of the draft chamber, which consists of a laboratory chamber 3 and a control chamber 5 set below the laboratory chamber 3.

The laboratory room 3 has a wide working space in the vertical and horizontal directions, and an exhaust passage 11 is formed by a buff-full plate 9 on the rear surface 7 side. Batsuful plate 9
is attached to the rear surface 7 by a bracket (not shown).
The lower end 9a is supported at both ends at a predetermined distance from the lower end 9a.
A space continuing to the air exhaust path 11 is secured between the workbench 13 and the workbench 13. Further, the upper end 9b is inclined forward to ensure a space between it and the top plate 15. A gas tap 17 and a water tap 19 are provided on the workbench 13, and gas and water can be controlled by operating control operating units 23, 23 provided on a control panel 21 of the control room 5. The control panel 21 having the control operation parts 23, 23 is inclined inward from the base part 25 of the laboratory 3 so that when an object is dropped, it does not hit the control panel 21.

On the other hand, a discharge port 29 is provided on the top plate 15 of the laboratory 3 outside the lighting device 27, and the discharge port 29 is connected to a duct 3 equipped with a suction fan (not shown).
1 is connected. Thereby, the gas in the laboratory 3 is discharged to the outside by operating the fan.

In addition, a sliding door 35 that can be moved up and down is provided at the entrance 33 on the entire surface of the laboratory 3, and the entrance 33
Both sides are tapered surfaces 37, 37 facing inward.
It is becoming. The tapered surfaces 37, 37 have a guiding function to guide the air from both side regions into the laboratory chamber 3 without difficulty.

The sliding door 35 is made of transparent tempered glass, and both ends of the sliding door 35 are slidably fitted into guide grooves 39, 39 with a U-shaped cross section formed on the left and right sides of the entrance 33, and are slightly moved up and down by a weight 41. It is balanced so that

That is, the weight 41 is set to have almost the same weight as the sliding door 35, and the weight 41 is set to have almost the same weight as the sliding door 35, and the guide rollers 43, 43
It is connected to a wire 45 whose one end is connected to the slide door 35 through the wire 45, and moves up and down along hoistways 47, 47 provided on the left and right rear sides of the draft chamber body 1. The position is determined by upper and lower stoppers 49, 49 provided within the 47. The upper stopper 49 is a weight 41
The sliding door 35 is set at a position where a slight gap is created at the lower end of the sliding door 35 when the sliding door 35 comes into contact with the slide door 35.

A handle portion 51 that is continuous in the longitudinal direction is fixed to the lower end of the slide door 35 via a bracket 53. The handle portion 51 and the bracket 53 are made of synthetic resin, and the brackets 53 are arranged at predetermined intervals and fixed to the lower end of the slide door 35 with screws 55. The bracket 53 and the handle portion 51 are fixed with screws 57.

The inner surface of the handle portion 51 serves as a guide surface 61 through which air blown out from the air outlet 59 along the slide door 35 is guided into the laboratory room 3 .

The air outlet 59 is connected and communicated via a duct 65 with an air outlet 63a arranged above the inlet 33 and provided with an air blowing fan 63. The air outlet 59 has first and second louvers 6 whose air outlet direction can be changed.
7 and 68 are provided. Furthermore, louver 6
Inside the upstream ducts 65 of 7 and 68, rectifying plates 69 having a large number of holes are arranged in multiple stages.

Further, below the blow-off port 59 and above the inlet 33, an intake port 71 is formed in a slit shape and communicates with the inside of the laboratory 3, and is provided continuously in the width direction.

In the draft chamber configured in this way, when the slide door 35 is raised and the inlet 33 is open, air blown out from the air outlet 59 is taken in from the inlet 33 and discharged to the outside from the outlet 29. Become so. At this time, the air in both side areas of the inlet 33 flows smoothly into the laboratory chamber 3 due to the tapered surfaces 37, 37.

Next, when the slide door 35 is lowered and the lower part of the inlet 33 is open, a part of the air blown from the air outlet 59 flows into the laboratory 3 from the intake port 71 and flows along the slide door 35. The descending air is guided by the guide surface 61 at the handle portion 51, so that a smooth flow toward the inside of the laboratory 51 can be obtained. Therefore, no vortices or turbulence are generated, and there is no risk of gas inside the laboratory flowing back toward the operator.

[Effects of the invention] As explained above, according to the draft chamber of this invention, the air blown out from the outlet can be smoothly directed into the laboratory by the guide surface of the handle. There is no vortex or turbulence, and there is no risk of gas flowing back toward the worker.

[Brief explanation of drawings]

Figure 1 is a partially cutaway side view of the draft chamber of this invention, Figure 2 is an enlarged sectional view of the handle, and Figure 3 is an enlarged sectional view of the handle.
The figure is a perspective view of the bracket, and FIG. 4 is a front view of the draft chamber. 1...Draft chamber body, 3...Laboratory, 29...Exhaust port, 31...Duct, 33...
Entrance, 35...Sliding door, 51...Handle part, 5
9...Air outlet, 61...Guide surface.

Claims (1)

[Scope of utility model registration request] There is a laboratory formed inside the draft chamber body, a sliding door that can be moved up and down to open and close the entrance to the laboratory, an air outlet installed above the sliding door that blows air from top to bottom, and an air outlet installed inside the laboratory. A handle is provided at the lower end of the slide door and is continuous in the longitudinal direction, and the inner surface of the handle is used to guide and discharge the air blown out from the outlet. A draft chamber characterized by having a guide surface for guiding the inside of a laboratory.