JPH07100452A - Method and device for preventing intrusion of dust from opening of factory building - Google Patents

Abstract

PURPOSE:To prevent effecitvely the intrusion of dust from an opening of a factory building by simple equipment without providing a dust preventing device occupying a factory building space and also without the necessity of a particular handling system for products. CONSTITUTION:An exhaust fan 12 set on a roof of a factory building 1 is stopped by sensing the inflow of atmosphere by means of an air inflow and outflow sensor 11 set in the vicinity of an opening 6 of a clean room 2 of the factory building 1 provided with a clean air supply device 8 for supplying clean air at all times, and the intrusion of dust generated by atmosphere is prevented by closing a shutter 13 placed on the inlet side of the exhaust fan 12. The operation of the exhaust fan 12 is restarted by sensing the outflow of the room air of the clean room 2 to the outside of the room by an air inflow and outflow sensor 11 and the shutter 13 is opened. The intrusion of dust from the opening of the factory building is prevented by the arrangement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for preventing dust intrusion from an opening of a factory building, and more particularly, from a opening of a clean room of a factory building containing a product production facility requiring a clean space. The present invention relates to a dust intrusion prevention method and device.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Laid-Open No. 327659/1992 discloses "a device for preventing dust intrusion at an entrance / exit of an article such as a factory building" as a technique for preventing dust intrusion from an opening of a clean room of a factory building. As shown in FIG. 2, the dust intrusion prevention device according to Japanese Patent Application Laid-Open No. 4-327659 is provided with a dustproof compartment A inside the factory at the entrance and exit of the factory. It is composed of a side gable wall 17, and an extendable ceiling 18 that can be projected from the entrance end and the back end,
An exhaust device 19 from the dustproof section A to the outside of the factory is provided.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The dust intrusion prevention device according to No. 659 requires that the dustproof compartment A be provided inside the factory at the entrance / exit of the factory. Therefore, by providing the dustproof compartment A inside the factory, the original production and storage of products etc. However, there is a problem that the effective space and space in the building that should be secured will be reduced or restricted. Further, the presence of the dustproof space A in the factory poses a problem that the degree of freedom in working is restricted when the product is moved in the factory. In addition, in order to prevent the intrusion of dust by operating the dust intrusion prevention device, the dustproof compartment A in the factory building
The retractable ceiling 18 must be opened and closed when loading and unloading articles from inside and outside, and the door 15 must be opened and closed when loading and unloading articles between the dustproof compartment A and outside the factory. There is a problem in that handling is required when entering the factory, and the time and labor required to do so hinder smooth work in a factory production line or the like.

The present invention eliminates the need to provide the dustproof section A that occupies the space of the factory building as in the dust intrusion prevention device described above, and uses a simple facility to carry out special handling as the product is carried in and out. It is an object of the present invention to provide a method and apparatus for preventing dust intrusion from an opening of a factory building that effectively prevents dust from entering the opening of the factory building that requires a clean space.

[0005]

In order to achieve the above object, the present invention provides an air inflow installed near the opening of a clean room of a factory building equipped with a clean air supply device for constantly supplying clean air.・ The outflow sensor detects the inflow of outside air and stops the exhaust fan installed on the roof of the factory building and closes the air flow breaker installed on the inlet side of the exhaust fan to inflow and outflow the air. The opening of the factory building that detects the inflow of indoor air in the clean room to the outside by the sensor, restarts the operation of the exhaust fan, and opens the air flow path breaker to prevent the ingress of dust by the outside air. It is constructed by the method of preventing dust intrusion from the parts.

The present invention also provides an air inflow / outflow sensor installed near an opening of a clean room of a factory building equipped with a clean air supply device for constantly supplying clean air, and a roof of the factory building. An exhaust fan installed above and an air passage breaker provided on the inlet side of the exhaust fan to block the flow of air are provided, and the inflow and outflow of outside air and the outflow of indoor air by the air inflow / outflow sensor are provided. Dust intrusion from the opening of a factory building characterized by stopping and restarting the operation of the exhaust fan and closing and opening the air flow path circuit breaker by a detection signal to prevent dust from entering due to outside air It is composed of a prevention device.

In the above invention, the clean air supply device supplies clean air to a clean room which requires a clean space in a factory building. Specifically, for example, an air supply fan and this air supply fan. It is composed of a dust filter provided on the outlet side of the. The clean room is a space that requires cleanliness within the factory building, and refers to the entire factory building,
It may be part of one factory. For example, there is a case where the inside of a factory building is partitioned by a wall and one is used as a clean room for production facilities and the other is used as a normal warehouse room. The opening may face the outside of the factory building, but may be provided in a wall or the like that partitions the clean space and forms a clean room in the same factory building. In addition, the opening may not be closed because it is usually used for transportation of products within a factory building, but a door may be provided in the opening. An air inflow / outflow sensor installed near the opening is a device that detects the inflow of outside air containing dust and the outflow of clean air from a clean room. Etc. are used. If there are multiple openings in the clean room, an air inflow / outflow sensor is provided for each opening, if necessary. The present invention intends to maintain the cleanliness in a factory building at a class of about 100,000. Normally, the outside air is in the class 1 million, and even if a clean air supply device is installed in the factory building, the cleanliness deteriorates to around class 500,000 if there is an opening in the factory building. According to the present invention, it becomes possible to maintain the cleanliness in a factory building at a class of about 100,000.

[0008]

In the present invention, the inflow and outflow sensors of air installed in the vicinity of the opening of the clean room of the factory building detect the inflow of outside air to stop the exhaust fan installed on the roof of the factory building. The air passage breaker provided on the inlet side of the exhaust fan is closed to increase the pressure inside the factory building and prevent dust from entering due to the inflow of outside air from the opening. In addition, the air inflow / outflow sensor detects the outflow of clean air from the inside of the clean room, restarts the operation of the exhaust fan, and releases the air flow circuit breaker to dissipate the indoor air, Prevent the temperature rise in the factory building due to heat generation and maintain a suitable working environment in the factory building from the viewpoint of room temperature.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. An example of the dust intrusion prevention device of the present invention will be described with reference to FIG. A factory building 1 shown in FIG. 1 includes a clean room 2 in which a production facility for products of steel strip coils 4 is installed, and an ordinary warehouse room 3
Consists of. The clean room 2 and the warehouse building 3 are partitioned by a closed wall 5, and an opening 6 for carrying out the steel strip coil 4 from the clean room 2 is provided in the lower part of the wall 5. . Further, the warehouse 3 of the factory building 1 is provided with a product carry-out port 7 for carrying out the product to the outside. The dust-laden air entering from the outside by opening the product outlet 7 is stored in the warehouse room 3.
By virtue of the presence, it is possible to weaken the flow into the clean chamber 2 through the opening 6, but the dust intrusion prevention device of the present invention prevents the flow from the opening 6 into the clean chamber 2. The factory building 1 includes a clean air supply device 8, and the clean air supply device 8 includes an air supply fan 9 and a dust filter 10. Further, the air inflow / outflow sensor 1 is provided near the clean room 2 side of the opening 6.
1. An anemometer is used in this example. An exhaust fan 12 is installed on the roof of the factory building 1, and a shutter 13 is installed on the entrance side of the exhaust fan 12. The rotation / stop of the exhaust fan 12 is interlocked with the rotation / closing of the shutter 13 used as an air flow path breaker. In addition to this, a damper, a check valve, a check valve, or the like can be used as the air flow path circuit breaker. Between the air inflow / outflow sensor 11 and the exhaust fan 12, there is provided a signal circuit 14 for transmitting signals from the air inflow / outflow sensor 11 to the outside air inflow / outflow.

Next, an embodiment of the dust intrusion prevention method of the present invention using the above dust intrusion prevention device will be described. An air inflow / outflow sensor 11 installed near the opening 6 of the clean room 2 of the factory building 1 detects inflow of outside air and outflow of indoor air. An anemometer is used as the air inflow / outflow sensor 11, and the air inflow / outflow wind speed control value is set to 0 m / s and the air inflow wind speed is 0 m /
When it is detected that the time exceeds s, the exhaust fan 12 is stopped and the shutter 1 provided on the entrance side of the exhaust fan 12 is stopped.
Close 3 Further, when the wind velocity of the outflow of the indoor air from the clean room 2 exceeds 0 m / s, there is no concern of dust intrusion, and rather, to suppress the rise in room temperature, the operation of the exhaust fan 12 is restarted and the shutter 13 is opened. . In this way, the cleanliness of the outside air was about 1 million,
The cleanliness of the clean room could be maintained below 100,000.

[0011]

According to the present invention, the opening of a factory building where a clean space is required without narrowing the effective space in the factory building and requiring no special handling when loading and unloading products. It is possible to effectively prevent intrusion of dust from the inside. Further, since it is not necessary to provide the dustproof section in the conventional technique, simple equipment can be used and the equipment cost can be reduced. In addition, the amount of clean air used in the factory building can be minimized without waste, the pressure in the factory building can be appropriately maintained, and a clean space can be maintained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 1 Factory Building 2 Clean Room 3 Warehouse Room 4 Steel Coil 5 Wall 6 Opening 7 Product Outlet 8 Clean Air Supply Device 9 Air Supply Fan 10 Dust Filter 11 Air Inflow / Outflow Sensor 12 Exhaust Fan 13 Shutter 14 Signal Circuit 15 Door 16 Side wall 17 Gable wall 18 Flexible ceiling 19 Exhaust device

Claims (2)

[Claims] 1. An air inflow / outflow sensor installed in the vicinity of an opening of a clean room of a factory building equipped with a clean air supply device for constantly supplying clean air to detect the inflow of outside air to detect the inflow of outside air. By stopping the exhaust fan installed on the roof and closing the air flow path breaker provided on the inlet side of the exhaust fan, dust is prevented from entering due to outside air, and the air inflow / outflow sensor prevents A method for preventing dust intrusion from an opening of a factory building, which detects the outflow of indoor air to the outside, restarts the operation of the exhaust fan, and opens the air flow path circuit breaker. 2. An air inflow / outflow sensor installed near an opening of a clean room of a factory building equipped with a clean air supply device for constantly supplying clean air, and installed on a roof of the factory building. An exhaust fan, and an air passage breaker that is provided on the inlet side of the exhaust fan and blocks the flow of air.
The air inflow / outflow sensor is used to stop / restart the operation of the exhaust fan and close / open the air flow path circuit breaker in response to detection signals of inflow of outside air and outflow of indoor air.
A device for preventing dust from entering through the opening of a factory building, which prevents dust from entering due to the outside air.