JPH01169253A - Ventilator for work site - Google Patents

Abstract

PURPOSE:To ventilate contaminated substances without allowing their scattering and facilitate the installation of a ventilation device, by installing a removable duct connection device on the way to a ventilation duct by way of a temporary duct whose end is connected with a local exhaust device and a connection metal fitting. CONSTITUTION:A duct facility 4 is provided with a duct connection device container 6 which contains a duct connection device 5. A temporary duct 7 is connected with a discharge 2a of a local exhaust device 2. The temporary duct 7 is further connected with the duct connection device 5. A removable cap 6a is installed to the duct connection device container 6. For example, a power plant in operation prohibits any work which may generate air- contaminating substances. Therefore, the duct connection device 5 is received inside the duct connection device container 6. As a ventilation device is installed by removing the cap 6a, a duct section 5a of the duct connection device 5 is bellow-shaped in construction, and is connected with the temporary duct 7 with a metal fitting 5b of the duct connection device 5 and a metal fitting 7a of the temporary duct 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to equipment for efficiently ventilating contaminated air in a workplace.

[Background of the invention]

Conventionally, workplace ventilation equipment that processes contaminated gases generated from contamination sources such as work machines in the workplace has, for example,
As shown in Japanese Unexamined Patent Publication No. 56-16804, the exhaust outlet of a local exhaust system in a workplace is directed toward a general exhaust system or a natural ventilation opening, and a coarse particle separator provided in the local exhaust system is used. 6 However, there are cases where the work involves handling radioactive pollutants (including gases) and it is necessary to keep the exposure dose of workers low, such as remodeling or demolition of equipment inside a nuclear power plant. For this purpose, it is necessary to suppress the scattering of pollutants and gases as much as possible, but in known examples, radioactive pollutants spread over a wide area because ventilation is carried out between the local exhaust system and the general exhaust system by the flow of air in the atmosphere. It has the disadvantage of being easily scattered.

In addition, in the case of construction of a nuclear power plant, where equipment and piping are installed after the building is first installed, the work area is often sealed, and a general exhaust system, natural ventilation openings, and work area are used. are located extremely far away, and the known example was not an effective solution.

In order to ventilate without scattering pollutants or contaminated air into the air, temporary ducts made of vinyl or other materials are used to run long distances from the source of contamination within a workplace to the outside or to the inlet of a duct. Ta. Therefore, setting up this temporary duct requires a lot of man-hours, which has the drawback of increasing the radiation exposure of workers during remodeling and demolition work of nuclear power generation equipment. In addition, the temporary duct itself is unsafe because it has to be routed over a long distance, which obstructs the passage of workers.
In addition, it hindered the delivery of work equipment and materials, leading to an increase in man-hours and construction period.

[Purpose of the invention]

The purpose of this invention is to solve the problem of conventional ventilation equipment, and to provide a system that can ventilate the workplace without scattering pollutants into the atmosphere, is easy to install, and can be used to protect workers, equipment, etc.
The objective is to provide ventilation equipment that does not impede the passage and transport of materials.

[Summary of the invention]

The structure of the present invention is to exhaust dust generated from a pollution source in a workplace into a permanent duct through a place exhaust device and a temporary duct connected to it, thereby scattering pollutants into the atmosphere with a relatively small amount of power. It is possible to ventilate contaminated air in the workplace without having to worry about it, and it is possible to connect a temporary duct in any direction to the permanent duct, and
The main point is to have equipment that can be stored within the main duct.

[Embodiments of the invention]

Next, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows a workplace equipped with ventilation equipment according to the invention. 1 in the figure is a working part that is a source of air pollution, and a local exhaust system 2 is installed in this air pollution source 1.
In the vicinity of the workplace, there is a duct equipment 4 for ventilation of the building.
I have been placed. Further, the duct equipment 4 is provided with a duct joining equipment storage equipment 6 that stores the duct joining equipment 5. A temporary duct 7 is provided at the discharge port 2a of the local exhaust device 2.
are joined, and the temporary duct 7 is further joined to a duct joining device 5.

The local exhaust device 2 has a suction port 2 adjacent to the air pollution source 1.
b, and an exhaust fan 2c is installed between it and the discharge port 2a. Further, a butterfly valve for adjusting air volume or a damper for preventing backflow is installed at the discharge port 2a.

On the other hand, a dust treatment device (not shown) such as a filter and an exhaust fan (not shown) are installed on the extension of the duct equipment 4, and the air transferred by the duct equipment 4 is discharged outdoors.

First, pollutants generated from the air pollution source 1 are collected as a flow 101 from the suction port 2b by the force of the exhaust fan, and are discharged from the discharge port 2a. The discharged air containing pollutants flows through the temporary duct 7 and becomes 102.
It is discharged to the duct equipment 4 via the duct joint bag @5. After being discharged, it becomes a flow 103 due to the suction force of the exhaust fan located on the extension of the duct equipment 4, and after pollutants are removed by the dust treatment device located on the extension of the duct equipment 4, it is discharged outdoors. .

Next, an embodiment of the ventilation equipment installation preparation method of the present invention will be described based on the drawings.

FIG. 2 is a diagram showing, for example, a location where nuclear power generation equipment is in operation. In the figure, reference numeral 4 indicates duct equipment for ventilation of the building during operation, and in the middle of the duct equipment 4, duct joint equipment storage equipment 6 is installed at regular intervals.

FIG. 3 is a sectional view showing a state in which the duct joining device is housed. 4 in the figure is the aforementioned duct equipment, which is connected to the duct joining device storage equipment 6. The duct joining device 5 is stored in the duct joining device storage facility 6 in a contracted state. The duct joint device storage equipment 6 is equipped with a lid 6a that can be attached and removed using a screw type or the like.
The duct joining device 5 includes the holding plate 6b, the lid 6a, and the frame 6c.
prevents it from falling off.

As shown in FIGS. 2 and 3, for example, in an operating nuclear power generation facility, work that generates air pollutants is not performed, so the duct joint device 5 is connected to the duct joint device storage facility 6.
It is housed in the building and does not obstruct nearby passage. Air movement for building ventilation flows in the duct equipment 4 10
However, since the storage equipment 6 is sealed in the duct joint bag, the flow 104 is not obstructed.

Next, the ventilation equipment of the present invention will be installed, but first, the lid 6a of the duct joint equipment storage equipment 6 located near where the work will be performed is removed. By removing the lid 6a, the duct joining device 5 can be extended in the A direction. Since the duct portion 5a of the duct joining device 5 has a bellows structure, it can be oriented in any direction. Next, the installation is completed by connecting the duct joining bag @5 and the temporary duct 7 with the metal fitting 5b of the duct joining device 5 and the metal fitting 7a of the temporary duct 7 (FIG. 4).

Next, a method for storing ventilation equipment according to the present invention will be explained.

After the work is completed, remove the metal fittings 5b of the duct joining device 5 and the metal fittings 7a of the temporary duct 7, fold up the bellows of the duct portion 5a of the duct joining device 5, store it in the duct joining device storage facility 6, and attach the lid 6a. This completes the storage (Figure 3).

〔Effect of the invention〕

According to the present invention, it is possible to prevent contamination in the workplace, and also contribute to reducing the radiation exposure of workers when one work involves handling radioactive materials.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the equipment of the present invention used in a workplace, Fig. 2 is a perspective view of the equipment of the invention housed, and Fig. 3 is a cross section showing the duct joining device housed. figure,
FIG. 4 is a side view showing the connection between the duct joining device and the temporary duct. 1... Air pollution source, 2... Local exhaust system, 4...
Duct equipment, 5... Duct joining device, 6... Duct joining device storage equipment, 7... Temporary duct. 1st figure 2 figure 3 figure

Claims (1)

[Claims] 1. A ventilation duct consisting of an exhaust fan and a dust treatment device, which transports gas, is provided with a bellows-type expandable duct and fittings for joining the temporary duct in the middle, and one end is connected to a local exhaust system. A ventilation system for a workplace, characterized in that a duct joining device is provided that can be attached and detached via the temporary duct in the direction of the temporary duct and the joining metal fittings.