JP2005270820A - Draft chamber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a draft chamber formed so as to prevent turbulence eddy flow and vortex flow from generating in a confluent portion of an air flow flowing down along the back face of an elevating door when the elevating door is close and an air flow introduced into a treatment chamber through an air intake passage. <P>SOLUTION: The draft chamber is provided with an air guide member 20 protruding backward in mountain shape at the back face of the lower end part of the elevating door 14, also forming an upper part guide face 20a turning backward, slantwise and downward to bend an air flow F1 flowing down along the back face of the elevating door 14 backward on the upper face, and forming a lower part guide face 20b directing an air flow F2 located at the upper part of the back part opening of the air intake passage 12 and passing through the air intake passage 12 when the elevating door 14 is close in a direction along the upper face of a base plate 8 on the lower face. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a draft chamber in which an intake passage opening forward is provided at a front end portion of a bottom plate of a processing chamber.

  A conventional draft chamber used in a laboratory or the like has contaminated air or specific gravity on the upper surface of a bottom plate, which is a work surface in the processing chamber, when the elevator door provided at the front opening of the processing chamber is closed. In order to prevent accumulation of large gas or the like, there is an intake passage that is inclined obliquely upward at the front end portion of the bottom plate, through which outside air is introduced along the work surface (for example, Patent Document 1).

In addition, the rear surface of the handle provided at the lower end of the lift door protrudes rearward, and a concave curved surface is provided on the upper portion to deflect the air flow flowing down along the rear surface of the lift door, and the lower surface is treated. The air flowing into the processing chamber through the lower part of the elevator door at the front opening of the chamber is directed rearward and upward so that the air flow deflected by the concave curved surface and the turbulent flow are smoothly merged. Some have a convex curved surface (rear arc portion) (Patent Document 2).
Japanese Patent No. 3326306 Utility Model Registration No. 2607704

  However, in the thing of patent document 1, when a raising / lowering door is closed, the airflow which flowed down along the rear surface of the raising / lowering door and the airflow which flowed in into the process chamber through the intake passage made a right angle or an obtuse angle. There is a problem that a turbulent flow or vortex flow is generated at the merged portion, the normal air flow in the processing chamber is obstructed, and the air circulation efficiency is deteriorated.

  Moreover, in the thing of patent document 2, even if the flow of air when the elevator door is opened is improved, no countermeasure is taken against the air flow when the elevator door is closed. Assuming that the handle is attached to the lifting door of Patent Document 1, the rear end of the concave surface of the handle and the opening at the rear of the intake passage are considerably separated in the vertical direction. Turbulence and vortex flow are generated between the air flow deflected rearward and the air flow introduced from the intake passage, and a part (upper part) of the air flow introduced from the intake passage becomes a convex curved surface of the handle. The air flow on the intake passage side is diffused in the vertical direction in the processing chamber, and the flow in the direction along the work surface is reduced, thereby preventing the retention of air on the work surface. To reduce.

  In view of the above-described problems of the prior art, the present invention provides an air flow that flows along the rear surface of the lift door when the lift door is closed, and an air that is introduced into the processing chamber through the intake passage. Prevents the generation of turbulence and eddy currents at the junction with the flow, improves the air flow in the processing chamber, effectively prevents air from staying on the work surface, and easily puts equipment in and out of the processing chamber. An object is to provide a draft chamber that can be made.

According to the present invention, the above problem is solved as follows.
(1) A lift door is provided at the front opening of the processing chamber provided with an exhaust port connected to the exhaust device at the top, and the lower end of the lift door is placed on the front end of the bottom plate of the processing chamber when the lift door is closed. In the draft chamber provided with an intake passage which is directed obliquely upward after introducing outside air into the processing chamber, the rear surface of the lower end of the elevator door protrudes in a mountain shape toward the rear, and the upper surface of the elevator door An upper guide surface that is inclined downward after deflecting the air flow flowing down along the rear surface is formed on the lower surface, and the lower surface is positioned above the rear opening of the intake passage when the elevating door is closed. An air guide member formed with a lower guide surface for directing an air flow through the passage in a direction along the upper surface of the bottom plate is provided.

(2) In the above item (1), the upper guide surface and the lower guide surface of the air guide member intersect with each other in a pointed shape at the rear end.

(3) In the above item (1) or (2), the lower guide surface is a concave curved surface continuous to the intake passage.

(4) In any one of the above items (1) to (3), the air guide member is formed integrally with a handle provided on the front surface of the lower end portion of the elevating door.

(5) In any one of the above items (1) to (4), when the lifting door reaches the lower limit position, the front edge member that is brought into contact with the lower end of the lifting door is used as the front end of the bottom plate of the processing chamber. And an intake passage is formed between the front edge member and the front end of the bottom plate.

(6) In the above item (5), the upper surface of the front edge member is made level with the upper surface of the bottom plate.

(7) In the above item (5) or (6), a cushioning material is provided at the lower end of the lifting door so as to come into contact with the upper surface of the front edge member when the lower limit position is reached.

(1) According to the first aspect of the present invention, the air flow in the processing chamber flowing down along the rear surface of the lift door is deflected backward along the upper guide surface of the air guide member, and the intake passage. The air flow introduced into the processing chamber through the air is deflected rearward along the lower guide surface of the air guide member, and both air flows are disturbed when they exit rearward from the rear end of the air guide member. Without causing flow or vortex flow, they join together in a laminar flow, flow backward, and flow along the work surface, which is the upper surface of the bottom plate, so that polluted air and gases with high specific gravity remain on the work surface. Can be effectively prevented, and the flow of air in the processing chamber can be improved.

(2) According to the invention described in claim 2, the air flow along the upper guide surface and the air flow along the lower guide surface can be merged in an orderly manner without generating turbulent flow or vortex flow.

(3) According to the invention described in claim 3, the air flow introduced into the processing chamber from the intake passage flows smoothly rearward in a laminar flow along the lower guide surface continuous to the intake passage. be able to.

(4) According to the invention described in claim 4, since the air guide member can be formed integrally with the handle, the manufacturing becomes easy and the positioning to the lifting door and the mounting work are simplified.

(5) According to the invention described in claim 5, the intake passage can be easily formed and the appearance of the front lower portion of the processing chamber can be improved.

(6) According to the invention described in claim 6, since the upper surface of the front edge member is flush with the upper surface of the bottom plate, it is possible to easily carry in and out the laboratory equipment and instruments into the processing chamber.

(7) According to the invention described in claim 7, the cushioning material can prevent the occurrence of a collision sound when the elevating door is closed and the deformation and breakage of the front edge member, thereby improving the durability. it can.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the draft chamber has a housing (4) that forms a processing chamber (3) with an open front on a base (2) provided with an open door (1) on the front. It is made up of what was placed.

  An exhaust port (6) connected to an exhaust device (not shown) is provided at substantially the center of the top plate (5) in the processing chamber (3).

  As shown in FIG. 3, on the front end surface of the bottom plate (8) in the processing chamber (3), there are an inclined surface (9a) inclined from the upper end toward the front lower side, and a horizontal surface (9b) facing the front from the front lower end. ) Having a long left and right intake guide (9) is fixed.

  Above the intake guide (9), a horizontal piece (10a) whose upper surface is flush with the upper surface of the bottom plate (8), an inclined piece (10b) that is inclined forward and downward from its front end, and from its front end A front edge member (10) that is long in the left-right direction, which is a so-called airfoil, consisting of a hanging piece (10c) that hangs down directly below and a bent piece (10d) that extends rearward from its lower end, The intake guide (9) is supported by a plurality of support plates (11) rising from a plurality of locations in the longitudinal direction. Between the front edge member (10) and the intake guide (9), a processing chamber (3 ) Is directed rearward from the front side, and then an intake passage (12) is formed which is directed obliquely upward rearward and guides outside air into the processing chamber (3).

  A fixed translucent plate (13) is provided in the upper part of the front opening of the processing chamber (3), and an elevator door (14) made of the translucent plate is disposed in front of the housing (4). It is mounted so as to be movable up and down along a guide groove (16) facing the up and down direction provided on the inner surface of the both side plates (15).

  The elevating door (14) is linked to a balance weight (not shown), can move up and down with light force, and can be stopped at an arbitrary opening, that is, at an arbitrary height. Since this structure is not directly related to the present invention, the description thereof is omitted.

  A horizontally long handle (17) is attached to the lower end of the elevator door (14). This handle (17) has a concave groove (18) facing in the left-right direction in the center of the upper part, and by fitting this concave groove (18) to the lower end of the elevator door (14) and fixing it, It is attached to the handle (17).

On the front side of the handle (17) with respect to the elevating door (14), a concave groove (19) for handing is provided in the left-right direction.
An air guide member (20) is formed integrally on the rear side of the handle (17) from the elevating door (14) so as to protrude rearward in a mountain shape when viewed from the side.

  On the upper surface of the air guide member (20), there is formed an upper guide surface (20a) which is directed obliquely downward after deflecting the air flow (F1) flowing down along the rear surface of the elevating door (14) backward. Yes.

  The lower surface of the air guide member (20) is located above the rear opening of the intake passage (12) and is continuous with the upper edge of the rear opening of the intake passage (12) when the elevating door (14) is closed. A lower guide surface (20b) is formed which forms a concave curved surface and directs the air flow (F2) passing through the intake passage (12) in a direction along the upper surface of the bottom plate (8).

  The upper guide surface (20a) and the lower guide surface (20b) intersect each other at an acute angle at the pointed portion (20c) at the rear end of the air guide member (20).

  A hollow portion (21), (22), and (23) are provided in the upper and lower portions of the front side of the handle (17) and the center of the rear surface side, respectively, and a hollow portion (23) having a triangular shape in rear side view is provided. Inside, a rib (24) extending horizontally from the inside of the tip (20c) to the front is provided.

  Also, at the lower end of the handle (17), when the elevating door (14) reaches the lower limit position, an elastic body such as rubber, which is in contact with the upper surface of the horizontal piece (10a) in the front edge member (10). A cushioning material (25) is provided.

  In this draft chamber, when the elevating door (14) is closed to the lower limit position, the lower guide surface (20b) of the air guide member (20) is located above the rear opening of the intake passage (12). (12) The air flow (F2), which is located in a concave curved surface continuous with the upper edge and is introduced into the processing chamber (3) through the intake passage (12), flows into the lower guide surface (20b). Along the back.

  Further, the air flow (F1) in the processing chamber (3) flowing down along the rear surface of the lift door (14) is counteracted backward along the upper guide surface (20a) of the air guide member (20). When the air guide member (20) exits behind the tip (20c), both airflows (F1) and (F2) smoothly flow into a laminar flow without causing turbulence or vortex flow. It joins and goes to the rear and flows along the work surface, which is the upper surface of the bottom plate (8).

  Therefore, polluted air or gas with a large specific gravity staying on the work surface is caused to flow backward by the combined air flow (F1) (F2), so it is effective that they stay on the work surface. In addition to being prevented, an ideal air flow without turbulence or vortex flow can be formed in the processing chamber (3).

  As shown by an imaginary line in FIG. 2, when the elevating door (14) is opened to an arbitrary position, the air flow (F3) flowing into the processing chamber (3) through the lower part is moved to the air guide member ( The air flow (F1) that flows backward along the lower guide surface (20b) of 20) and flows down along the rear surface of the lift door (14) or fixed translucent plate (13) is the same as above. In addition, the two airflows (F1) and (F3) generate turbulence and vortex flow when they are warped backward along the upper guide surface (20a) and come out rearward from the tip (20c). It merges and becomes a laminar flow and flows smoothly toward the rear.

  In the above example, the upper guide surface (20a) of the air guide member (20) is an inclined surface inclined backward and downward, but it may be a gentle concave curved surface.

It is an external appearance perspective view of one Embodiment of this invention. Similarly, it is a center vertical side view. It is an expansion vertical side view of the A section of FIG.

Explanation of symbols

(1) Open door
(2) Base
(3) Processing room
(4) Housing
(5) Top plate
(6) Exhaust port
(8) Bottom plate
(9) Intake guide
(9a) Inclined surface
(9b) Horizontal plane
(10) Front edge material
(10a) Horizontal piece
(10b) Tilting piece
(10c) Hanging piece
(10d) Folded piece
(11) Support plate
(12) Intake passage
(13) Fixed translucent plate
(14) Lift door
(15) Side plate
(16) Guide groove
(17) Handle
(18) Concave groove
(19) Groove
(20) Air guide member
(20a) Upper guide surface
(20b) Lower guide surface
(20c) Tip
(21) (22) (23) Hollow part
(24) Rib
(25) cushioning material
(F1) (F2) (F3) Air flow

Claims (7)

An elevating door is provided at the front opening of the processing chamber having an exhaust port connected to an exhaust device at the top, and outside air passes through the lower end of the elevating door at the front end of the bottom plate of the processing chamber when the elevating door is closed. In a draft chamber provided with an intake passage that is directed obliquely upward after being introduced into the processing chamber,
An upper guide surface is formed on the rear surface of the lower end portion of the lift door so as to protrude rearwardly, and on the upper surface, the upper guide surface faces obliquely downward after deflecting the air flow flowing down along the rear surface of the lift door backward. And a lower guide surface on the lower surface, which is positioned above the rear opening of the intake passage when the elevator door is closed, and directs the air flow passing through the intake passage in a direction along the upper surface of the bottom plate. A draft chamber provided with a guide member.   The draft chamber according to claim 1, wherein the upper guide surface and the lower guide surface of the air guide member intersect with each other in a pointed shape at the rear end.   The draft chamber according to claim 1 or 2, wherein the lower guide surface is a concave curved surface continuous to the intake passage.   The draft chamber according to any one of claims 1 to 3, wherein the air guide member is formed integrally with a handle provided on a front surface of a lower end portion of the elevating door.   When the elevator door reaches the lower limit position, a front edge member is provided at the front end of the bottom plate of the processing chamber so that the lower end of the elevator door contacts, and between the front edge member and the front end of the bottom plate. The draft chamber according to any one of claims 1 to 4, wherein an intake passage is formed.   The draft chamber according to claim 5, wherein the upper surface of the front edge member is flush with the upper surface of the bottom plate. The draft chamber according to claim 5 or 6, wherein a cushioning material is provided at the lower end of the elevating door so as to come into contact with the upper surface of the front edge member when the lower limit position is reached.

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