RU36781U1 - PULL OUT DROBE - Google Patents

Description

pull out drobe.

The utility model relates to ventilation technology, namely, devices designed to remove harmful substances directly from the place of their formation, and can be used when working with chemical reagents in laboratory conditions.

A fume hood is known, including a work table with a worktop and a working chamber fixed on it, located in the housing and having a front, rear, upper and side walls, with an opening made on the front wall, closed by a movable frame with a transparent insert, and placed inside the working chamber screens attached to the rear wall of the working chamber, see utility model of the Russian Federation. No. 25177 according to class. 08B 15/02, publ. 2002

In this fume hood, the screens are attached to the back wall of the working chamber, on which pockets are made for placement of fastening elements in them, this reduces the working volume of the duct and reduces the ventilation efficiency.

Known fume hood for removing harmful substances when working with chemical reagents, including a work table with a worktop and a working chamber mounted on it, located in the housing and having a front, rear, upper and side walls, with an opening made on the front wall, closed by a movable frame with transparent

 B 08B 15/02

insert, and with a vertical screen placed inside the working chamber, installed with gaps relative to the tabletop and the upper wall of the working chamber, and an inclined screen installed above the vertical screen with gaps relative to the vertical screen and the upper wall of the working chamber, both screens are attached to the rear wall of the working chamber cameras, see the application for the nozle model of the Russian Federation No. 2003109806/20 (011102), a positive decision on the issuance of natent dated May 07, 2003, according to B 08B 15/02.

This technical solution is taken as a prototype of this utility model.

However, it has disadvantages.

In the fume hood of the prototype:

- vertical and inclined screens are attached to the rear wall of the working chamber, on which pockets are made for accommodating fastening elements in them, this reduces the working volume of the duct;

- the presence of pockets on the back wall contributes to the formation of stagnant zones, this reduces the efficiency of ventilation.

The present utility model is based on the solution of the problem, increasing the working volume of the duct, increasing the efficiency of ventilation of the working chamber and expanding the operational capabilities of the fume hood

According to a utility model, this problem is solved due to the fact that the fume hood includes a work table with a worktop and a working chamber fixed on it, mixed in the housing and having front, rear, upper and side walls, with an opening made on the front wall, closed by a movable frame with a transparent insert, and with a vertical screen placed inside the working chamber, installed with gaps relative to the countertop and the upper wall of the working chamber, and an inclined screen installed above the vertical screen, includes gaps vertical screen and the upper wall of the working chamber, while both screens are attached to the wall of the working chamber. The vertical screen is fixed, and the inclined screen has the ability to move in a horizontal plane in the direction from the rear wall of the working chamber to its front wall and change its adjustable gap relative to the vertical screen, while the gaps of the vertical screen are fixed, in addition, both screens are attached to the side walls working chamber. In addition, the adjustable clearance is minimal when working with heavy reagents. In addition, the adjustable clearance is maximized when working with light chemicals. The applicant has not identified sources containing information about technical solutions identical to this utility model, which allows us to conclude that it meets the criterion of “novelty. The essence of the utility model is illustrated by drawings, which depict: in FIG. 1 - general view of a fume hood, axonometry; measure re L measures in FIG. 2 is a diagram of the distribution of air notes in working capri work with heavy reagents; in FIG. 3-diagram of the distribution of air flow in the working chamber with light reagents. A fume hood contains: Table 1, a table top 2. A working chamber 3, a housing (chambers 3) 4, a front wall (chambers 3) 5, a rear wall (chambers 3) 6, side walls (chambers 3) 7, -the top wall (chambers 3) 8. The frame (on the front wall 5) 9. The vertical screen 10, a fixed gap (between the screen 10 and the table top 2) 11, a fixed gap (between the screen 10 and the upper wall 8 ka3) 12. Inclined screen 13, adjustable (minimum) clearance (between screens 10 and 13) 14, adjustable (maximum) clearance (between screens 10 and 13) 15, clearance (between screen 13 and upper wall 8 of camera 3 with the clearance 14) 16, the gap (between the screen 13 and the upper wall 8 of the chamber 3 with a maximum gap of 15) 17., The exhaust pipe 18, The exhaust hood contains a table 1 with a worktop 2, on which the working chamber 3 is installed. The working chamber 3 is placed in the housing 4. The working chamber 3 has a front 5, rear 6, side 7 and upper 8 walls. On the front wall 5 there is an opening closed by a movable frame 9 with a transparent insert. Inside the working chamber 3, a vertical screen 10 is rigidly fixed, installed with a gap 11 relative to the countertop 2 and with a gap 12 relative to the upper wall 8 of the working chamber 3. The gaps 11 and 12 are fixed. Inside the working chamber 3 above the vertical screen 10, an inclined screen 13 is fixed, installed with a gap of 14 or 15 relative to the vertical screen 10, when working with heavy or light reagents, respectively, and with a gap of 16 or 17 relative to the upper wall 8 of the working chamber 3, during operation with heavy or light chemicals, respectively. The inclined screen 13 has the ability to move in a horizontal plane in the direction from the rear wall 6 to the front wall 5 of the working chamber 3 and the ability to change the gap 16 or 17 and the adjustable gap 14 or 15. The vertical 10 and inclined 13 screens are attached to the side walls 7 of the working chamber 3 The vertical screen 10, the inclined screen 13 and the rear wall 6 of the working chamber 3 form an exhaust duct connected to the exhaust pipe 18, which is connected to the ventilation system. 5

The tabletop 2, the working chamber 3 and the structural elements of the working chamber, including the exhaust pipe 18, are made of plastic and rigidly connected, for example, glued.

Vertical 10 and inclined 13 screens and their fasteners are made of plastic.

Plastic is selected taking into account its resistance to a specific aggressive working environment.

A fume hood works as follows; in its image.

Depending on the degree of volatility of harmful things; substance with which

to work, carry out the installation of the inclined screen 13 in the required position.

When working with heavy reagents, the inclined screen 13 is set so that the adjustable gap 14 with the vertical screen 10 is minimal, and the gap 16 with the rear wall 6 of the working chamber 3 is maximum.

When working with light reagents, the inclined screen 13 is set so that the adjustable gap 15 with the vertical screen 10 is maximum, and the gap 17c with the rear wall 6 of the working chamber 3 is minimal.

Through a raised frame 9, chemical reagents are placed on the countertop 2 of the working table 1. By connecting the exhaust pipe 18 to the ventilation system in the working chamber 3 creates a vacuum of air. Harmful substances enter the exhaust channel formed by the rear wall 6 of the working chamber 3, the vertical screen 10 and the inclined screen 13, from where they are removed through the exhaust pipe 18.

The proposed utility model provides:

(f 6 —increasing the working volume of the duct due to the fastening of the screens to the side walls of the working chamber and obtaining a duct width equal to the width of the rear wall; —increasing the ventilation efficiency of the working chamber by increasing the duct volume without stagnant zones and performing an inclined screen with the ability to move and regulation of the gap between the screens; -extending operational capabilities by making the vertical screen stationary with fixed gaps along the upper and lower edges, providing reagents in the working space of the duct, as well as by making the gap between the shields adjustable, providing work with various types of reagents, as well as by attaching the shields to the side walls, which ensures that any additional devices, for example, water and gas taps, are placed on the rear wall of the chamber The proposed utility model can be implemented using conventional, well-known materials and devices, and this determines, according to the applicant, his compliance with the criterion of “industry naya applicability.

Claims (3)

1. A fume hood to remove harmful substances when working with chemical reagents, including a work table with a worktop and a working chamber fixed on it, located in the housing and having a front, rear, upper and side walls, with an opening made on the front wall and closed by a movable frame with a transparent insert, and with a vertical screen placed inside the working chamber, installed with gaps relative to the countertop and the upper wall of the working chamber, and an inclined screen mounted above the vertical screen, with gaps relative to the vertical screen and the upper wall of the working chamber, both screens attached to the wall of the working chamber, characterized in that the vertical screen is fixed, and the inclined screen has the ability to move in a horizontal plane in the direction from the rear wall of the working chamber to its front wall and change its adjustable gap relative to the vertical screen, while the gaps of the vertical screen are fixed, in addition, both screens are attached to the side walls of the working chamber. 2. A fume hood according to claim 1, characterized in that the adjustable clearance is minimal when working with heavy reagents. 3. A fume hood according to claim 1, characterized in that the adjustable gap is made maximum when working with light chemicals.