JPS625258B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a ductless factory exhaust system that allows harmful gases, dust, hot air, and other harmful substances generated in the working areas of various factories to be discharged outdoors without ducting without diffusing them indoors. Regarding equipment.

Gases generated in factories that worsen the working environment.
Although it is desirable to remove dust, hot air, etc. (collectively referred to herein as hazardous substances) from the work area, consideration must be given so as not to hinder the work. For example, in chemical factories and steel mills, even if ducts are installed from the sources of these hazardous substances to discharge them outdoors, the ducts may make it impossible for cranes to move, or the exhaust equipment may interfere with the original production equipment. In some cases, complete removal of these harmful substances cannot be expected.
In addition, the cost of equipment becomes enormous if perfection is to be achieved, and improvements are often neglected, especially in existing factories.

The present invention has developed a device that can extremely effectively discharge harmful substances from the source of the harmful substances to the outdoors without installing duct piping, not only in the case of new factory construction but also in the case of existing factories. A hood that covers the upper part of a source of harmful substances in a factory, and an axial blower installed in the hood with the suction port facing inside the hood and the blowout port facing the space above the hood. It consists of an exhaust blow-off unit, an axial blower installed in the ceiling space with its suction and blow-off ports facing horizontally, and an airflow control blow-off unit installed inside the ceiling, and an outdoor exhaust ventilation fan attached to the ceiling, which contains harmful substances. To provide a ductless factory exhaust system which guides the exhaust gas from the generation source to the outdoors by airflow conveyance without a duct.

To specifically explain the apparatus of the present invention according to the embodiments of the drawings, in FIG. In an example in which the exhaust gas is located on the floor of a factory consisting of a wide area, the entire system is shown for discharging the air to the ventilation fan 2 in the exhaust building without a duct. For convenience of explanation, the space in the factory is divided from bottom to top, as shown in the figure: work area A, intermediate area B,
It is called ceiling airflow control area C. A hood 5 of sufficient size to cover the hazardous substance generation source 1 in the work area A is fixedly installed, and an in-hood exhaust blowing unit 3 is attached to the hood 5 to match the size of the hood 5. The required number has been installed.

This exhaust blow-off unit 3 has a simple structure in which an axial blower 4 is mounted in a cylinder with both ends open, and the blow-off side end has a tapered nozzle opening so as to obtain a jet flow. Therefore, the gas drawn into this unit from one opening end (suction port) by the drive of the axial blower 4 is ejected from the outlet as a jet flow, forming a jet flow with a long reach. This exhaust blow-off unit 3 is fixed to the hood 5 with its suction port facing into the hood 5 and its blow-out port facing the space above the hood 5 (intermediate region B). As a result, dust, harmful gases, hot air, etc. collected in the hood 5 are mixed with the air flow in the work area A drawn into the hood 5 and are drawn into the exhaust blow-off unit 3, and this exhaust blow-off From unit 3, a jet flow containing these dust, harmful gases, hot air, etc. is ejected vertically toward intermediate region B.
It rises to the ceiling airflow control area C, and these harmful substances are carried to the ceiling airflow control area C by riding on this airflow.

In the ceiling airflow control area C, a unidirectional horizontal airflow is caused to flow by an airflow control blowing unit 7 having an axial blower 6 installed in a cylinder with openings at both ends. That is, in substantially the same way as the exhaust blow-off unit 3 described above, the air drawn into this unit 7 from one opening end (suction port) by the drive of the axial blower 6 flows through the tapered nozzle opening. This airflow control blowout unit 7, which blows out the air as a jet from the other open end (blowout port), is fixed in the ceiling airflow control area C with its suction port and blowout port oriented in the horizontal direction. And, as the most preferable aspect,
The units are arranged horizontally in series with each other so that the direction of the outlet of one outlet unit for controlling airflow is directed toward the inlet of the other outlet unit for controlling airflow. Furthermore, several of them are provided in parallel to form a unidirectional airflow that spreads in a plane in the ceiling airflow control area C.

When the vertical upward flow from the exhaust blowing unit 3 reaches the ceiling airflow control area C formed in this way, harmful substances are carried horizontally by this horizontal ceiling airflow, and the outdoor exhaust ventilation fan When it reaches the exhaust ridge 2, it is mixed with the induced flow of the ventilation fan 2 and discharged outdoors. That is, harmful substances such as harmful gases, dust, and hot air are transported from various sources 1 to the ventilation fan 2 in a ductless manner.

On the other hand, in the work area A, supply air (uncontaminated air) is blown out toward the worker's living area from the air supply outlet 9 provided near the worker's living space. In order to prevent this supply air from mixing with harmful substances from the harmful substance generation source 1, an axial blower internal air supply control unit having substantially the same structure as the above-mentioned in-hood exhaust blow-off unit 3 or ceiling airflow control blow-off unit 7 is installed. The air supply flow is controlled by the jet flow from the blow-off unit 10.

As described above, the present invention makes it possible to transport harmful substances from the source to the outdoors without using ducts and without dispersing them indoors, and allows cranes to move freely without using ducts. To provide a device for improving the working environment in a factory that is useful and does not interfere with the installation of other production equipment.
Further, the device of the present invention can separate the supply airflow and the exhaust airflow, so it exhibits an excellent effect in that the required ventilation amount can be reduced. Moreover, this also reduces the heat load.

[Brief explanation of the drawing]

FIG. 1 is an overall diagram of the equipment arrangement of the apparatus of the present invention. 1...Harmful substance generation source, 2...Outdoor exhaust ventilation fan,
3... In-hood exhaust blow-off unit, 4, 6... Axial flow blower, 5... Hood, 7... Air flow control blow-off unit.

Claims (1)

[Claims] 1. A hood that covers the upper part of the source of harmful substances in the factory, and an in-hood exhaust blow-off unit with an axial flow blower attached to the hood with the suction port facing inside the hood and the blow-off port facing the space above the hood. , an airflow control unit installed inside the axial blower installed in the ceiling space with the inlet and outlet oriented horizontally, and an outdoor exhaust ventilation fan installed on the ceiling, which eliminates exhaust gas containing harmful substances. A ductless factory exhaust system that guides the air from the source to the outdoors by airflow conveyance without a duct.