JPS621492B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a backflow prevention device for a rooftop ventilation fan using a wind direction plate, which prevents the flap of the shutter that prevents wind and rain from blowing into the roof ventilation fan, and prevents the shutter on the side where the wind and rain blows from The purpose is to quickly close the airflow passage and operate the ventilation side shutter to open slowly.

For conventional rooftop ventilation fans, it is most important to prevent wind and rain from flowing back into the interior, since the original purpose of rooftop ventilation fans is to ventilate the building and maintain equipment. Based on such a request, a device related to Utility Model Publication No. 44-2393 was provided, but
According to the same idea, the lower part of the main shaft with a wind vane attached to it is connected to the shutter by a cable, and the ups and downs of the main shaft are directly related to the shutter, which causes the shutter to operate too sensitively to wind pressure and flapping. There was a drawback that the shutter and the exhaust pipe or the shutter and the peripheral wall of the top cover frequently came into contact, producing noise.

In view of these circumstances, the present invention is based on the above-mentioned Utility Model Act
The purpose is to improve the invention related to 2393, and to open and close the shutters without flapping, while closing the shutters on the wind and rain side quickly, and conversely opening the shutters on the ventilation side gradually. do.

An embodiment of the present invention will be described below in detail with reference to the drawings. An exhaust pipe 4 is erected on the pedestal 1 surrounding a fan motor 3 supported by supporting legs 2 erected on the pedestal 1, The canopy 6 is supported by support rods 7 so as to surround the upper opening of the exhaust pipe 4 and form an air circulation opening 5 around it.
An upper shaft 9 is supported and crowned with... and has a wind direction plate 8 fixed to its upper end, and a shutter 10 at its tip.
The lower shaft 12 is connected to the base end of the index rod 11 which is pivotally connected to the index rod 11 so that the length of the index rod 11 can be freely adjusted. It can be installed vertically or vertically. Shutters 10 and index rods 11 are provided on all sides of the canopy 6, and each shutter 10 is connected to the canopy 6.
The index rod 11 is pivoted and suspended from the peripheral vertical wall 6'.
With the indexing action, the air circulation port 5 is opened and closed in a freely openable and closable manner, and the fixed gear rally 15 opened in the vertical wall 6' of the canopy 6 is opened or closed.
Furthermore, as shown in FIG. 2, each indexing rod 11 is divided at a proper point, and the other end of one rod, on which the shutter 10 is pivotally connected, is fixed to the end plate 16' of the piston cylinder 16, and the other end is connected to the lower shaft 12. A piston 17 is fixed to the other end of the rod and slidably fitted into a piston cylinder 18, and a small hole 19 is bored in the piston 17, and an elastic valve 20 is provided in the piston 17 to freely open and close the small hole 19. The lower shaft 12 connected via the bearing holder 13 to the upper shaft 9 fixed to the wind direction plate 8 bends in a dogleg shape with respect to the upper shaft 9. When the piston 17 moves toward the lower shaft 12, the piston 17 closes the small hole 19 to quickly retract the piston 17, and the piston 17 is fixed as described above to the index rod 11 connected to the bent side of the lower shaft 12. Shatter 10
By opening the small hole 19 when moving to the side, the piston 17 moves slowly. As another embodiment, as shown in FIG. 3, a spring 28 for pressing the piston 17 may be loaded in the piston cylinders 16, 18, and as another embodiment, as shown in FIG. By extending the telescopic bellows member 21 across the vertical wall 6' of the canopy 6, the indexing rod 11 can be indexed by the lower shaft 12 without being separated as in the previous embodiment. When the index rod 11 moves backward, the shutter 10 is opened quickly, and when the index rod 11 moves forward, the shutter 10 is gradually closed. In the figure, 22 is a bearing, 23 and 24 are bearing boxes, 25 is a flexible cap, 26 is a rod adjuster, and 27 is a rod adjuster mounting bracket.

Since the present invention is constructed in this way, when the wind is about to flow backwards into the exhaust stack 4 from the headwind-side air circulation port 5 opened by a strong headwind, the upper shaft 9 integrated with the wind direction plate 8 bends to the leeward side. As the upper shaft 9 bends, the lower shaft 12 also bends downwind in a dogleg shape. Therefore, the index rod 11 on the windward side connected to the lower shaft 12 is indexed to the leeward, and the shutter 10 is moved to the exhaust pipe 4. The air flow opening 5 is closed in contact with the upper edge of the airflow opening 5 to prevent backflow of wind. At this time, the index rod 11 on the leeward side can maintain the original state of the shutter 10 by the movement of the piston 17, that is, the state in which the air circulation port 5 is opened and ventilation is performed, or the bellows member 21 on the windward side can be extended and the leeward side can be maintained. When the bellows member 21 on the side contracts, the shutter 10
Similar opening and closing operations are performed. The shutter 10 on the windward side is also energized by the inflow of wind from the opening of the fixed gear rally 15, and assists the closing operation of the shutter 10, and if the wind is strong enough not to flow back into the exhaust stack 4, the fixed gear rally 15 is energized. The exhaust force from the exhaust stack 4 is stronger than the inflow of wind from the shutter 10.
Since it is pressed against the vertical wall 6' of the canopy 6, there is no risk of it flapping and making noise.
1, when the rod on the side to which the piston 17 is fixed is indexed by the bending of the lower shaft 12, it attracts the elastic valve 20 and causes air to flow in from the small hole 19, so that the piston 17 quickly retracts and the entire length of the index rod 11 is reduced. The shutter 10 is quickly closed by keeping it extended to a predetermined length, and the piston 17 fixed to the index rod 11 on the leeward side presses the elastic valve 20 so that the small hole 19 is closed.
is closed, and therefore the piston 17 is gradually advanced, and with the entire length of the index rod 11 shortened to a predetermined length, the shutter 10 is pressed against the inner wall of the vertical wall 6' to maintain a ventilated state.

As described above, the present invention is a useful invention that has a robust structure, is easy to manufacture, and is reliable in operation.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing an embodiment of the present invention, Fig. 2 is an enlarged cutaway view of main parts showing a piston cylinder connected to a divided index rod, and Fig. 3 is a piston cylinder attached to a separated index rod. Fig. 4 is an enlarged cutaway view of the main part showing another embodiment in which the bellows member is attached across the vertical wall of the shutter and the canopy; FIG. 3 is an enlarged longitudinal cross-sectional view of a main part showing a state in which the attached upper shaft and the lower shaft are connected to the shutter via an index rod. 3...Fan motor, 4...Exhaust pipe, 5...Air circulation port, 6...Canopy, 6'...Vertical wall, 8...
Wind direction plate, 9... Upper shaft, 10... Shaft, 11... Index rod, 12... Lower shaft, 1
3... Bearing holder, 14... Return spring, 1
5... Fixed gear rally, 16, 18... Piston cylinder, 16', 18'... End plate, 19... Small hole,
20... Elastic valve, 21... Bellows member, 28...
Spring.

Claims (1)

[Scope of Claims] 1. An upper shaft 9 having a wind direction plate 8 fixed to the center of a canopy 6 which is crowned so as to open four circumferential air circulation openings 5 at the upper part of an exhaust pipe 4 equipped with a fan motor 3. The bearing holder 13 is provided with a fixed gear lary 15 .
A lower shaft 12 connected to the upper shaft 9 via a return spring 14 is rotatably and vertically suspended from the center of the canopy 6, and the four air circulation openings 5 and the fixed gear rally 15 can be opened and closed. The index rod 11 has piston cylinders 16 and 18 interposed between the lower shaft 12 and the lower shaft 12.
A rooftop ventilation fan using a wind direction plate, in which a small hole 19 is bored in a piston 17 fitted in piston cylinders 16 and 18, and an elastic valve 20 is attached to freely open and close the small hole 19. backflow prevention device. 2. An upper shaft 9 with a wind direction plate 8 fixed to the center of a canopy 6 which is crowned so as to open four circumferential air circulation openings 5 in the upper part of an exhaust pipe 4 equipped with a fan motor 3 is rotatable and raised. A fixed gear lary 15 . . . is formed so as to be freely tiltable and has openings in the four circumferential vertical walls 6 ′ .
A lower shaft 12 connected to the upper shaft 9 via a return spring 14 is rotatably and vertically suspended from the center of the canopy 6, and the four air circulation openings 5 and the fixed gear rally 15 can be opened and closed. The index rod 11 has piston cylinders 16 and 18 interposed between the lower shaft 12 and the lower shaft 12.
This backflow prevention device in a rooftop ventilation fan utilizes a wind direction plate formed by elastically mounting a spring 28 in the piston cylinders 16 and 18, which presses a piston 17 that is connected to the piston cylinders 16 and 18. 3. An upper shaft 9 with a wind direction plate 8 fixed to the center part of a canopy 6 which is crowned so as to open four circumferential air circulation openings 5 in the upper part of an exhaust pipe 4 equipped with a fan motor 3 is rotatable and raised. A lower shaft 12 is installed such that it can be tilted freely and forms a fixed gear rally 15 with openings in the four circumferential vertical walls 6' of the canopy 6, and is connected to the upper shaft 9 via a bearing holder 13 and a return spring 14. The canopy 6 can be rotated and raised or lowered freely.
The shutter 10... and the lower shaft 12 are connected by an index rod 11, and a bellows member 21 is stretched across the shutter 10... and the vertical wall 6' of the canopy 6. A backflow device for a rooftop ventilation fan using a board.