JPH0256573B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure regulating device, and more particularly to a pressure regulating damper that opens when the pressure in an air-conditioned room exceeds a predetermined pressure.

A typical pressure regulating damper of the type described above is a damper that closes a rectangular opening, with the damper pivoted about one edge of the opening and a weight determining the opening pressure.

This type of damper requires a weight to support the pressure on the entire opening area, and when the damper is opened, it closes again due to the pressure drop, and this process is repeated, increasing the amplitude of the opening and closing of the damper. The mounting part may be damaged.

The cause of the above-mentioned failure is that the weight of the damper is extremely heavy and that there is no difference in opening and closing pressure.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pressure regulating damper for air conditioning, which reduces the weight of the weight and has a damper opening/closing pressure difference.

The outline of the pressure regulating damper according to the present invention is that the blade that closes the opening is divided into a first blade above the shaft and a second blade below the shaft, and the area difference between the first and second blades is adjusted. The weight of the weight is reduced so that a corresponding rotational moment is exerted by the static pressure in the room. Furthermore, a rectifier plate is provided on the indoor side that almost covers the small-area vane but receives static pressure, so that when the damper is opened, dynamic pressure is applied, thereby creating a difference between the opening pressure and the closing pressure.

With this configuration, the indoor static pressure when the damper is closed again is lower than the predetermined static pressure, and vibration of the damper blades does not occur.

Embodiments and drawings illustrating the present invention will be described.

The figure shows a pressure regulating damper according to the invention, which has flanges 2, 3 attached to both ends of a rectangular casing 1 and is attached to a desired attachment point of another duct or a chamber to be pressure regulated. A shaft 4 passing laterally through the casing 1 is rotatably supported relative to the casing. According to the invention, the mounting position of the shaft 4 is a certain distance from the upper edge 5 of the casing.

Attach vanes 6 and 7 above and below the shaft 4.
The seats 8 and 9 are fixed in the casing 1, and the blades 6,
Form the contact surface of 7. A lever 10 is fixed to the outwardly projecting portion of the shaft 4. A weight 11 is fixed along the length of the lever 10 so that its position can be adjusted, and the opening pressure of the damper is adjusted. The lever 10 is extended horizontally in the damper closed position, as shown in FIG. 1, so that the effective acting force is maximum in the closed position.

A cover 12 is attached to the outside of the casing 1. The outer cover 13 of the cover 12 is made removable, and the position of the weight 11 is adjusted and fixed with a set screw 14. Feather 6
Attach balance weight 15 to.

In the casing 1, according to the present invention, a current plate 16,
Install 17. The baffle plates 16 and 17 are arranged horizontally across the inside of the casing so that the airflow hits only the blades 7 when the damper is opened. Therefore, the current plate 16 reaches near the shaft 4. As will be described later, in order to apply static pressure to the blades 6 when the damper is closed, a required distance is provided between the front shaft of the plate 16 and the shaft 4.

The operation will be explained.

According to the present invention, the weight of the weight 11 is
The product of the area difference between the levers and the damper opening static pressure is the lever 10.
It is determined to be equal to the product of the length of and the weight of the weight 11. Due to the gap between the current plate 16 and the shaft 4,
Static room pressure acts on the space on the right side of the blades 6 and 7 in FIG. Since the closing force is applied to the blade 6 and the opening force is applied to the blade 7, it is only necessary to determine the weight 11 based on the difference in effective area between the blades 6 and 7. The weight 11 is therefore significantly lighter than in known dampers in which the pivot axis is located close to the upper edge 5 of the casing.

When the indoor pressure exceeds a predetermined static pressure, the vanes 6 and 7 rotate clockwise about the shaft 4 from the closed position shown in FIG. 1, and the damper opens. Since the lever 10 is horizontal, when the shaft rotates, the component force of the weight 11 decreases due to the rotation of the lever 10, and the closing force decreases. Further, due to the baffle plates 16 and 17, the airflow, ie, the arrow 20, acts only on the blades 7, and only the blades 7 receive the dynamic pressure of the airflow.

Thus, when the indoor static pressure decreases by a certain value below the predetermined static pressure, the weight 11 closes the vanes 6 and 7.
In the closed state, no dynamic pressure acts, and only static pressure acts on the vanes 6, 7, so the damper maintains the closed position until the indoor pressure returns to the predetermined static pressure.

As mentioned above, since the damper according to the present invention has a closing pressure a certain value lower than the opening pressure, it does not generate vibrations, generate noise, or cause damage like known dampers.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of a pressure regulating damper according to the present invention, and FIG. 2 is a right end view. 1... Casing, 4... Shaft, 6, 7... Vane, 10... Lever, 11... Weight, 12... Cover, 16, 17... Current plate.

Claims (1)

[Scope of Claims] 1. A pressure regulating damper that opens when indoor static pressure reaches a predetermined value, comprising an opening that communicates between the chamber and a low-pressure space, and an opening that is rotatable about a horizontal axis. In a device equipped with a blade that opens and closes, and a weight that is attached to a lever fixed to a shaft and applies a closing force to the blade, the blade is divided into two parts: a first blade above the shaft and a weight below the shaft. As the second blade, indoor static pressure is used to generate a rotational moment corresponding to the area difference between the first and second blades, so that the first blade, which has a smaller area, is almost covered, but the static pressure also acts on the first blade. A pressure regulating damper characterized by having a rectifying plate on the indoor side. 2. The pressure regulating damper according to claim 1, wherein the lever is substantially horizontal when the damper is closed.