JP3104917U - Local exhaust ventilation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a local exhaust device which generates a rapid airflow by bringing an intake port close to a target object, applies the rapid airflow to the entire target device, and efficiently sucks and exhausts the entire device with a minimum amount of exhaust air. provide.
SOLUTION: In a local exhaust device comprising a liquid 5 which emits a volatile gas such as an organic solvent, a tank 1 for storing the liquid, and an intake nozzle 2 for sucking a volatile gas leaking from an upper opening of the tank 1. The suction port 6 of the suction nozzle 2 is arranged close to the liquid level in the tank, and suction and exhaust is performed by using a suction airflow from the surroundings obtained by the close arrangement.
[Selection diagram] Fig. 1

Description

  The present invention relates to a local exhaust device that cleans a work environment at a work site where paint is suctioned and exhausted from a paint at a work site that handles the paint.

At the site where paint is handled, the working environment is polluted by volatile gases generated from the solvent. In particular, in a closed work facility, the diffused volatile gas becomes full and adversely affects the human body.
Therefore, in a work place, it is necessary to keep the concentration of the solvent vapor as low as possible, and it is necessary to provide a necessary general ventilation device according to the type of the organic solvent. Then, it is necessary to determine the performance standard of the ventilation device in the whole workplace and maintain the work environment while operating them during the work.
Further, depending on a paint stirring device or the like, a method of enclosing the entire device with a curtain or the like and efficiently collecting volatile gas generated from a solvent during stirring to perform local exhaustion is adopted.
As described above, as a method of specifying a portion to be sucked and exhausted and sucking only a necessary portion, for example, a suction portion is partially formed as in Japanese Patent Publication No. 54-21461, and ventilation is effectively performed depending on the size of a workpiece. There is a way to do that.
Japanese Patent Publication No. 54-22461

Generally, when local exhaust is performed from a place distant from the gas generation source, in order to reliably inhale hot air, steam, exhaust gas, etc., these exhaust devices usually cover the entire target device or the entire painting area. It is provided to suck. As the distance increases and the crosswinds increase, the amount of intake air becomes enormous, and a useless amount of air is required.
In addition, in the above-described conventional local exhaust device, in order to use a curtain or an air curtain or the like, a special device including a blower and accessory equipment is required, the manufacturing cost is high, a large amount of installation work is required, and a special There was a problem that operating costs were also required.
In the technique of Japanese Patent Publication No. 54-22461, a local exhaust device in which the size of the device is reduced is described. However, the technology described in this publication has a problem that the device is complicated due to the provision of a primary processing device and a secondary processing device. was there.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to generate a rapid airflow by bringing an intake port close to an object, and to apply the rapid airflow to a target device. An object of the present invention is to provide a local exhaust device that efficiently suctions and exhausts the entire device with a minimum amount of exhaust air.

  As a means for achieving the above object, in the local exhaust device according to claim 1, a liquid that emits a volatile gas such as an organic solvent, a tank that stores the liquid, and a volatile gas that leaks from an upper opening of the tank In a local exhaust device including an intake nozzle that sucks air, a configuration is adopted in which the intake port of the intake nozzle is disposed close to the liquid level in the tank, and suction and exhaust is performed using a suction airflow from the surroundings obtained by the close arrangement. And

  In the local exhaust device according to claim 2, in the local exhaust device according to claim 1, an intake nozzle is inserted into the center of the liquid surface from an opening at the upper part of the tank, and the intake port is horizontally arranged facing the liquid surface. Then, the airflow is uniformly sucked from the outer edge of the intake port.

In the local exhaust device according to claim 3, a liquid that emits a volatile gas such as an organic solvent, a cylindrical body such as a filter or a funnel through which the liquid flows down, and a volatile gas that leaks from an upper opening of the cylindrical body In a local exhaust device having an intake nozzle for sucking air,
The suction port of the suction nozzle is disposed close to the upper side surface of the cylindrical body, and suction and exhaust are performed using a suction air flow obtained by disposing the suction port.

  In the local exhaust device according to the fourth aspect, a local exhaust device includes a liquid that emits a volatile gas such as an organic solvent, a tank that stores the liquid, and an intake nozzle that suctions the volatile gas leaking from an upper opening of the tank. In the apparatus, an intake port is extended along one end of the opening above the storage tank, and suction and exhaust are performed uniformly from the intake port.

  According to a fifth aspect of the present invention, there is provided the local exhaust device according to the fourth aspect, wherein the intake port is disposed over substantially half a circumference of the opening above the circular storage tank.

Since the present invention is configured as described above, the following effects can be obtained.
In the local exhaust device according to the first aspect, since the intake port is brought close to the liquid level in the tank, the intake port is narrowed by a gap between the liquid level and the liquid level, and a rapid airflow is generated there. Along the way, the suction airflow propagates and inhales volatile gases.
The rapid air flow reaches the tank side and the tank top from the liquid level, and covers the entire tank.
Conventionally, a method of ventilating the entire gas generating portion from a distant point has been used. However, the local exhaust device of the present invention can ventilate the entirety with an extremely small air volume as compared with a conventional exhaust device.

  In the local exhaust device according to the second aspect, the suction port is horizontally arranged facing the liquid surface, and the rapid airflow is uniformly sucked from the outer edge of the suction port. Can be spread.

  In the local exhaust device according to the third aspect, since the intake port of the intake nozzle is disposed close to the upper side surface of the cylindrical body through which the liquid flows, the intake port is narrowed by the cylindrical body. A rapid airflow is generated in the air, and the suction airflow sucks volatile gas along the cylindrical body.

In the local exhaust device according to the fourth aspect, since the intake port extends along the opening edge at the upper end of the storage tank, a suction airflow is generated in a constant direction at the opening edge, and suction and exhaust are performed according to the airflow.
In the local exhaust device according to the fifth aspect, since the intake port is disposed over a half circumference of the upper end edge of the circular storage tank, suction and exhaust is uniformly performed in a certain direction over the entire opening.

  Hereinafter, the best mode for carrying out the present invention will be described.

As shown in FIG. 1, the local exhaust device according to the first embodiment has a tank 1 for storing paint 5 and an intake nozzle 2 inserted into the tank 1 from above.
The paint 5 has a property of generating a volatile gas harmful to the human body by containing an organic solvent. When the volatile gas is filled in the work place, the paint 5 has a bad effect on the human body. Perform suction and exhaust to maintain a good working environment.
The tank 1 is a cylindrical tank, which is surrounded by a horizontal bottom surface 3 and a vertical side surface 4, and the top surface is opened to the same extent as the bottom surface. Therefore, the volatile gas emitted from the paint 5 has a shape that is diffused from the opening.
The intake nozzle 2 is a pipe having a circular cross section, and the intake port 6 has a circular shape. This nozzle is inserted vertically into the center of the tank 1 and its intake port 6 faces the liquid surface horizontally. The distance between the liquid surface and the inlet 6 depends on the suction capacity, but is set to a distance of several centimeters so as not to suck the liquid.
In addition, since the intake port 6 faces the liquid surface close to the liquid level, the intake port 6 is narrowed between the liquid level and the intake air flow distribution, which acts on the circumference and acts on the outer peripheral edge of the upper portion of the tank. .

When the suction nozzle 2 is inserted into the center of the tank 1 and the suction port 6 is arranged so as to face the liquid surface, the airflow sucked from the suction port 6 is narrowed between the suction port 6 and the liquid surface. In this state, the amount of exhaust air accelerates and suction is rapidly performed.
Then, as indicated by the arrow, the rapid air flow travels along the liquid surface, reaches the side wall, rises the side wall, performs suction from the upper end, and absorbs all volatile gas emitted from the liquid surface.
At the position v in the figure, a control wind speed of a required predetermined value can be obtained using the tank edge even with a small amount of exhaust air.
Conventionally, the volatile gas is sucked entirely from a distance, but in the present embodiment, the rapid airflow is used with a small amount of exhaust air by bringing the intake port 6 close to an obstacle (liquid level). As a result, the entire exhaust can be efficiently performed.

As shown in FIGS. 2A and 2B, the local exhaust device according to the second embodiment includes a tank 1 for storing paint, a paint 5 to be poured into the tank 1, and a filtering device for filtering the paint 5. 7 and the intake nozzle 2 arranged on the side surface of the filtration device 7 are the main components.
The tank 1 is a cylindrical tank, which is surrounded by vertical side surfaces 4 and has an open upper surface. Therefore, the volatile gas emitted from the paint has a shape that is diffused from the opening.
Further, the bottom surface 3 is inclined obliquely, and a paint discharge nozzle 8 is disposed at the lower end thereof. The nozzle 8 is opened and closed to take out the paint in the tank.
The filtration device 7 is configured to have a cylindrical side surface 9 and a bottom surface 10 of a wire mesh, and is a device that removes foreign matter of the paint with the wire mesh 10 while the paint flows down from above.
The intake nozzle 2 is a pipe having a circular cross section, and the intake port 6 has a circular shape. This nozzle is in a state of facing close to the cylindrical side surface 9 of the filtering device 7. The distance between the side surface 9 and the intake port 6 is set to a distance of about several cm, depending on the intake capacity.
Further, since the intake port 6 faces the side face 9, the intake port 6 is narrowed between the side face 9 and the normal intake air flow is accelerated to increase the intake speed.

The paint 5 is introduced into the tank through the filter 7 while the paint 5 flows down from the paint discharge nozzle 11 to the filter 7.
The foreign matter is removed from the paint 5 flowing down by the filtering device 7, and volatile gas is generated from the upper end and the lower end of the filtering device 7.
Here, the volatile gas is sucked and discharged from the intake port 6 because the intake port 6 is arranged close to the side surface. The airflow sucked from the intake port 6 is in a state where the intake port 6 is narrowed between the intake port 6 and the side surface 9, and the amount of exhaust air is accelerated.
Then, as indicated by the arrows, the rapid air flow flows up, down, left, and right along the side surface of the filtration device 7, and absorbs all volatile gas emitted from the upper end and the lower end of the side surface of the filtration device.
At the position v in the figure, a control wind speed of a required predetermined value can be obtained using the tank edge even with a small exhaust air amount.
In the related art, the volatile gas is sucked entirely from a distance, but in the present embodiment, the rapid airflow is used with a small amount of exhaust air by bringing the intake port close to the obstacle (side surface 9). Exhaust can be efficiently performed.
In this embodiment, the circular filtering device 7 is used. However, as the shape of the circular filtering device (cylindrical body), a filtering device having a square shape in plan view (outer shape) as shown in (c) is used. However, the same effect can be obtained.

The local exhaust device according to the third embodiment includes, as shown in FIGS. 3A and 3B, a tank 1 for storing paint, a paint 5 to be poured into the tank 1, and a funnel 12 for guiding the paint. The suction nozzle 2 disposed on the side surface of the funnel 12 has a main configuration.
The tank 1 is a cylindrical tank, in which only the insertion opening of the funnel 12 is open, and the side and top surfaces are closed.
The funnel 12 is composed of a cylindrical upper end portion 13 and an inclined portion 14 converging diagonally downward from the upper end portion 13, receives the flowing paint at the inclined portion, and guides the paint to the mouth of the tank.
The intake nozzle is a pipe having a circular cross section, and the intake port 6 has a circular shape. This nozzle faces close to the cylindrical upper end 13 of the funnel. The distance between the upper end 13 and the intake port 6 is set to a distance of about several cm, depending on the intake capacity.
In addition, since the intake port 6 faces the side surface of the funnel 12, the intake port is in a state of being narrowed between the side surface and the normal exhaust air volume is accelerated and the intake speed is increased.

The paint is introduced into the tank 1 through the funnel 12 while the paint 5 flows down from the paint discharge nozzle 11 to the funnel 12.
As the paint flows down, volatile gas is generated from the upper end of the funnel.
Here, since the inlets are close to the upper end 13 of the funnel, these volatile gases are sucked and discharged from the inlet 6. The airflow sucked from the intake port is in a state where the intake port is narrowed with the side surface, and the amount of exhaust air is accelerated.
Then, the rapid airflow flows up, down, left, and right along the side surface of the filtration device as indicated by arrows, and absorbs all volatile gas emitted from the upper end of the side surface of the funnel 12. The intake wind speed travels along the side surface of the funnel and reaches the opposite side, and inhales so as to surround the outer edge of the funnel.
In the position of v in the figure, a required predetermined value of control wind speed can be obtained using the edge of the cylindrical body even with a small exhaust air amount.
In the related art, the volatile gas is sucked entirely from a distance. In the present embodiment, the rapid airflow is used with a small amount of exhaust air by bringing the intake port close to the obstacle (upper end 13). Exhaust can be performed efficiently.
In this embodiment, the circular funnel 12 is used. However, the same effect can be obtained even when the shape of the circular funnel (cylindrical body) is a square-shaped funnel (outer shape). Can be obtained.

As shown in FIGS. 4A, 4B, 4C, and 4D, the local exhaust device according to the fourth embodiment includes a tank 1 for storing paint, a rotary shaft 15 for kneading the paint, and a rotation drive unit. 16 and the intake port 6 arranged along the opening edge of the upper end of the tank are the main components.
The tank 1 is a cylindrical tank, which is surrounded by a horizontal bottom surface 3 and a vertical side surface 4, and has an upper surface opened to the same extent as the bottom surface. Therefore, the volatile gas emitted from the paint has a shape that is diffused from the opening.
The rotation drive unit 16 has two stirring shafts 15 inserted into the tank, and the stirring shaft 15 is driven and rotated to knead the paint in the tank. At the time of kneading, the main body of the rotary drive unit 16 descends to the upper surface of the tank and closes the upper surface of the tank.
The intake port 6 extends along the opening edge of the upper end of the tank, and is configured to perform suction and exhaust uniformly from the intake port.
That is, as shown in FIGS. 4C and 4D, the intake duct 18 is arranged so as to surround a half circumference of the tank, and the intake port 6 extends inside the intake duct 18. Therefore, suction and exhaust are performed uniformly from the intake port through the duct.

During the kneading of the paint, the rotation drive unit 16 closes the top of the tank, so that the leakage of volatile gas is small, but the volatile gas leaking from the junction between the rotation drive unit 16 and the tank 1 is sucked through the suction port 6. Is done.
When the kneading is completed, the rotation drive unit 16 rises, the upper portion of the tank 1 is released, and the volatile gas diffuses from the upper surface of the tank.
Here, the intake duct 18 is arranged so as to surround a half circumference of the tank 1, and the intake port 6 extends inside the intake duct 18. Therefore, the gas leaking from the tank edge is uniformly sucked and exhausted from the intake port 6. At the location (v) in FIG. 14B, a required predetermined value of control wind speed can be obtained using the tank edge even with a small amount of exhaust air.

As shown in FIGS. 5A and 5B, the local exhaust device according to the fifth embodiment includes a tank 1 for storing paint, a rotating shaft 15 for kneading the paint, and an opening edge at the upper end of the tank. The arranged intake port 6 has a main configuration.
The tank 1 is a cylindrical tank, which is surrounded by a horizontal bottom surface 3 and a vertical side surface 4, and has an upper surface opened to the same extent as the bottom surface. Therefore, the volatile gas emitted from the paint has a shape that is diffused from the opening.
The rotating shaft 15 is inserted into the tank, and the agitator 17 at the tip of the rotating shaft 15 rotates to knead the paint in the tank.
The intake port 6 extends along one end of the opening above the tank, and is configured to perform uniform suction and exhaust from the intake port.
That is, as shown in FIG. 5B, the intake duct 18 covers substantially one-third of the opening on one end side of the tank, and the intake port 6 extends at the tip of the duct 18. . Therefore, suction and exhaust are uniformly performed from the intake port.

When the paint is kneaded, the volatile gas diffuses from the upper surface of the tank.
Here, the intake duct 18 is arranged so as to surround a half circumference of the tank 1, and the intake port 6 extends inside the intake duct 18. Therefore, gas leaking from the tank edge is uniformly sucked and exhausted from the inlet 6.
At the position v in the figure, a predetermined required amount of control wind speed can be obtained using the tank edge even with a small exhaust air amount.

Although the embodiment of the present invention has been described above, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change within a range not departing from the gist of the present invention, the present invention is not limited to the embodiment. included.
For example, the shape of the intake port is not particularly limited, and the present invention includes any configuration in which the intake port is brought close to an object, or any configuration in which the intake port extends along the opening edge of the upper end of the tank. .

FIG. 2 is a schematic side view of the local exhaust device according to the first embodiment. It is a schematic explanatory view of a local exhaust device according to a second embodiment. It is a schematic explanatory view of a local exhaust device according to a third embodiment. It is a schematic explanatory view of a local exhaust device according to a fourth embodiment. It is a schematic explanatory view of a local exhaust device according to a fifth embodiment.

Explanation of reference numerals

Reference Signs List 1 tank 2 suction nozzle 3 bottom surface 4 side surface 5 paint 6 suction port 7 filtration device 8 nozzle 9 side surface 10 bottom surface (wire mesh)
DESCRIPTION OF SYMBOLS 11 Nozzle 12 Funnel 13 Upper end part 14 Inclined part 15 Stirring shaft 16 Rotation drive part 17 Stirrer 18 Intake duct

Claims (5)

In a local exhaust device including a liquid that emits a volatile gas such as an organic solvent, a tank that stores the liquid, and an intake nozzle that suctions the volatile gas that leaks from an upper opening of the tank,
A local exhaust device in which an intake port of the intake nozzle is disposed close to a liquid surface in a tank, and suction and exhaust is performed using a suction airflow from the surroundings obtained by the close arrangement.   2. A structure in which an intake nozzle is inserted into the center of the liquid surface from an opening at an upper portion of the tank, the intake port is horizontally arranged facing the liquid surface, and the airflow is uniformly sucked from an outer edge of the intake port. Local exhaust system. A local exhaust having a liquid that emits a volatile gas such as an organic solvent, a cylindrical body such as a filtering device or a funnel through which the liquid flows down, and an intake nozzle that suctions the volatile gas leaking from an upper opening of the cylindrical body. In the device,
A local exhaust device in which an intake port of the intake nozzle is disposed close to an upper side surface of a cylindrical body, and suction and exhaust is performed using a suction airflow obtained by disposing the intake port in close proximity. A liquid that emits a volatile gas such as an organic solvent, a tank that stores the liquid, and a local exhaust device that includes an intake nozzle that suctions a volatile gas that leaks from an upper opening of the tank.
A local exhaust device having a configuration in which an intake port extends along one end of an opening above the storage tank, and suction and exhaust are performed uniformly from the intake port. 5. The local exhaust device according to claim 4, wherein the intake port is arranged over substantially half a circumference of the opening above the circular storage tank.

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