JPH0599481A - Regulator for flow rate of air - Google Patents

Abstract

PURPOSE:To permit the introduction of stabilized amount of atmosphere at all times by a method wherein the title device is regulated automatically so as to be capable of introducing a given flow rate of air by keeping a balance between a draft resistance and the pressure of a spring. CONSTITUTION:A lid plate 1 is connected to a regulating plate 2 for flow rate of air through a shaft 3 and a spring 5 is provided between the lid plate 1 and an outside cover 4 while a casing 6 is mounted in the cover of a main body so that air is collided uniformly against the regulating plate 2 for flow rate of air. Accordingly, airflow, entered between the lid plate 1 and the cover of main body, is introduced into the inside of an unit through the casing 6. In this case, the introduced air pushes the regulating plate 2 for flow rate of air whereby the flow rate of air is choked. Accordingly, a force, pushing the regulating plate 2 for flow rate of air, is weakened, then, the lid plate 1 is opened again by the spring 5 whereby atmosphere is introduced. According to this method, the stabilized amount of atmosphere can be introduced at all times even when a pressure difference between the inlet port and the outlet port of the flow rate regulating device is fluctuated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for adjusting the amount of air introduced into a room such as a clean room by adjusting the balance between the pressure inside and outside the room and the spring pressure of the apparatus.

[0002]

2. Description of the Related Art A damper is attached to an outside air inlet of a conventional clean room or the like, and the air volume is adjusted by this damper. And this damper is a manual type or an automatic type.

[0003]

In order to adjust the amount of outside air introduced in the related art, it is difficult to make fine adjustment because the opening of the damper is manually operated, and it cannot be said that an appropriate amount of outside air is introduced. There was a problem.

An object of the present invention is to automatically adjust the introduced amount of outside air to an optimum state.

[0005]

[Means for Solving the Problems] Generally, in a clean room or the like, the outside air is introduced in order to maintain a positive pressure in the room. The outside air is introduced into the room through the fact that the suction side duct of the air conditioner has a negative pressure. By utilizing this negative pressure, a constant air flow is made to flow by maintaining the balance between the resistance of the air hitting the air flow adjusting device provided at the inlet and the spring pressure of the device.

[0006]

The outside air entering from the outside air introduction port is guided to the inside through the inside of the casing. A lid is attached to the inlet of the inlet, and the lid is connected to the air volume adjusting plate inside the casing. The lid also has a spring.
When the outside air flows in the casing, the outside air pushes the air volume adjusting plate, so that the lid is closed and the air volume is reduced. When the air volume is further reduced, the force that pushes the air volume adjusting plate becomes weaker, so the lid opens due to the force of the spring. By utilizing this balance, a constant air volume is maintained.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The air flow rate adjusting device of the present invention will be described below with reference to the illustrated embodiments. In the figure, D is a return duct,
A hole H having a required opening area for introducing outside air is formed in a part of the return duct D, and an outer cover 4 having a required length is provided so as to surround the outer periphery of the hole H of the return duct D.

A cylindrical casing 6 is inserted inside the outer cover 4, its tip is fixed to the outer cover 4, and a lid plate 1 is provided opposite to the outer surface of the outer cover 4 to form a lid. A spring 5 is provided between the outer covers 4, and the lid plate 1 is pushed out by this spring pressure to open the opening surface of the casing 6.

A shaft 3 is projectingly provided inside the lid plate 1. The shaft 3 is inserted into a casing 6 and a conical air volume adjusting plate 2 is fixed to the tip of the shaft. A packing 7 may be provided on the inner side surface of the cover plate 1 so that the cover plate 1 can be closed tightly when the cover plate 1 is pressed against the opening surface of the casing against the elastic force of the spring 5 by the outside air suction pressure.

Therefore, the lid plate 1 and the air volume adjusting plate 2 are connected by the shaft 3, and the spring 5 is provided between the lid plate and the outer cover 4.
And the casing 6 is installed in the main body cover so that the wind uniformly hits the air volume adjusting plate.
The wind that has entered between the cover plate 1 and the body cover is introduced into the unit through the casing. At this time, since the incoming wind pushes the air volume adjusting plate, the air volume is reduced. Further, when the force pushing the air volume adjusting plate weakens for this reason, the lid plate is opened again by the spring and the outside air is introduced.

[0011]

According to the present invention, since the amount of introduced outside air is automatically adjusted, it is not necessary to manually adjust the opening degree of the damper like a manual damper. Further, even if the pressure difference between the inlet and outlet of the air volume adjusting device fluctuates, it is possible to always introduce a stable outside air amount. Furthermore, the amount of outside air introduced can be easily adjusted by changing the resistance of the air volume adjusting plate.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an air flow rate adjusting device of the present invention.

[Explanation of symbols]

 1 Cover Plate 2 Air Volume Adjustment Plate 3 Shaft 4 Outer Cover 5 Spring 6 Casing 7 Packing

Claims (1)

[Claims] 1. An outside air introduction device in a clean room or the like consisting of a temperature control unit and a prefabricated chamber, which automatically introduces a constant air volume (variable air volume) by maintaining a balance between ventilation resistance and spring pressure. An air volume adjusting device characterized by adjusting.