TWI541475B - Exhaust pipe anti - backflow device - Google Patents

Description

Anti-backflow device for exhaust duct

The invention relates to a backflow prevention device, in particular to a backflow prevention device for an exhaust duct which can improve the use effect thereof.

According to a conventional anti-backflow device, such as the "Backward Damper Structure" approved by the Department of Economics on June 1, 1994, which is mainly issued in a ventilator provided with an exhaust fan. Outside, and its inlet end faces the exhaust fan, and its exhaust end faces outward; when the exhaust fan draws out the air, its airflow exerts a thrust on one side of the baffle facing obliquely downward, causing the baffle to be oriented on the axis of rotation The heart rotates at an angle, and an opening is formed on the upper and lower sides between the baffle and the air duct, so that the air is smoothly discharged from the opening; when the air blower is turned off and the air thrust is lost, the weight of the lower half of the baffle is Rotating back to the original position; if the air pressure on the outer side of the vent is large, and the thrust is applied to one side of the inclined upper surface of the baffle, the upper and lower sides of the baffle are blocked by the inner side wall of the air duct and cannot be rotated. And the side edge of the baffle is tightly closed with the air duct to prevent the outside air from entering the vent. The above-mentioned conventional structure is not difficult to find that there are still some shortcomings, the main reasons are as follows: The board must be assembled After being placed in the air duct and aligning the shaft hole of the baffle with the shaft hole of the vent, the shaft can be inserted into the baffle and the vent by the outside of the air duct. The assembly method is quite inconvenient and more convenient. In any skewed state, the rotating shaft will not be inserted smoothly, so that there is a lack of assembly, and the baffle is monolithically placed at the vent of the air duct. If the air pressure of the exhaust gas is too small, it will not be smooth. Push the baffle open, or only open the opening at a smaller angle, thus affecting the efficiency of gas discharge.

And a conventional anti-backflow device, such as the anti-backflow device of the bathroom ventilation duct, which is approved by the Department of Health, on March 11, 101, and has a housing. The inner circumference has an accommodating space, and an inlet end opening and an air outlet end opening are respectively formed at opposite ends of the accommodating space; an intake end unit is arranged in the inlet a gas outlet opening and communicating with the inlet end opening; an outlet end unit disposed at the outlet end opening and communicating with the outlet end opening; and at least one anti-backflow unit disposed in the receiving space, the anti-backflow unit including The frame body has an inner space, and a plurality of leaf sheets are pivoted on the frame body and located in the inner space; the plurality of leaf sheets are arranged up and down, partially overlapped, and can only be opened toward the air outlet end. The direction is one-way open. It is not difficult to find out that the above-mentioned conventional structure has some shortcomings. The main reasons are as follows: the plurality of hinges are convexly provided on both sides of the leaflet, and must be plural at the time of assembly. The hinges of the leaflets are simultaneously inserted into the left and right side plates of the frame to further combine the frames, so that the frame is easily displaced or peeled off during assembly, and there are also disadvantages that it is difficult to assemble, and the leaflets are Vertically facing downwards, so that the weight of the leaflet is not pressed on another leaflet, so that there is a gap between the leaflets, and there is no pressure-proof effect, and the outer flap is protruded between the leaflets. Non-flat table Let countercurrent gas can easily flip the bottom up leaflets to increase the gap, so that the effect of reducing blocking reverse flow of gas.

In view of this, the inventors have been engaged in the manufacturing development and design experience of related products for many years, and after detailed design and careful evaluation of the above objectives, the present invention has finally become practical.

The technical problem to be solved by the present invention is to provide an anti-backflow device for an exhaust duct in view of the above-mentioned shortcomings existing in the prior art.

A frame system is formed with an inclined ring along the inner edge, and a front end edge and a rear end edge are formed by the ring spacer frame, and the angle of inclination of the ring is directed toward the rear end edge of the frame body and is circulated with the gas. The direction forms an angle of 45 degrees to 80 degrees, and the frame body is symmetrically formed with a plurality of C-shaped buckles at the ring shape, and the C-shaped buckles are all formed with a notch toward the rear edge of the frame body, and the plurality of plate bodies are formed with one of the plates. a blocking piece, and an overlapping portion is formed on one side of the blocking piece, and a round rod is protruded from the two ends of the overlapping portion of the plate body, so that the overlapping portion of the plate body can pass through the ring edge from the front edge of the frame body And inserting the round rod into the C-shaped buckle from the notch on the side of the rear edge of the frame body, and the plate body is formed with a groove at the overlapping portion, and the ring or the other plate body of the frame is accommodated by the groove. The lower edge of the flap.

The first main object of the present invention is that the angle of inclination of the ring can make the plate body face the rear end edge of the frame body and form an angle of 45 degrees to 80 degrees with the gas flow direction, so that the block body of the plate body can be tightly weighted by the body. Resisting the overlap between the ring of the frame and the other plate, not only has the elimination frame The function of the gap between the body and the plate body can prevent the counter-flowing gas from opening the plate body at any angle, so as to effectively improve the single-guide flow and prevent the use of the reverse flow.

A second main object of the present invention is that the plate body is formed with a groove in the overlapping portion, and the groove is used to receive the ring of the frame body or the lower edge of the blocking piece of the other plate body, that is, the plate body concealing frame When the body forms a flat surface that is inclined, the effect of the counterflow gas not being able to open the plate at any angle is achieved.

A third main object of the present invention is that the overlapping portion of the plate body passes through the ring of the frame body from the front end edge, and the round bar is placed in the gap of the C-shaped buckle in a reverse manner at the rear edge of the frame body. In addition, the plurality of plates are quickly pivoted to the C-shaped buckle position of the frame, which can form a convenient assembly.

Other objects, advantages and novel features of the invention will be apparent from the description and appended claims.

[this creation]

10‧‧‧ frame

11‧‧‧ Ring

12‧‧‧ front edge

13‧‧‧ rear edge

14‧‧‧C-shaped buckle

141‧‧ ‧ gap

20‧‧‧ board

21‧‧ ‧Flap

22‧‧‧ overlap

221‧‧‧ Groove

23‧‧‧ Round rod

Figure 1 is a perspective view of the present invention.

Figure 2 is a perspective exploded view of the present invention.

Figure 3 is a cross-sectional view of the present invention.

Fig. 4 is a schematic view showing the state of use of the present invention (1).

Fig. 5 is a schematic view showing the state of use of the present invention (2).

In order to enable your review committee to have a better understanding and understanding of the purpose, features and effects of the present invention, please refer to the following [detailed description of the drawings] as follows: First, please refer to Figure 1, Figure 2 and Section 3. As shown in the figure, an anti-backflow device for an exhaust duct includes: a frame 10 and a plurality of plates 20, and a frame 10 is formed with an inclined ring 11 along the inner edge, and A front end edge 12 and a rear end edge 13 are formed by the ring frame 11 and the angle of inclination of the ring 11 is toward the rear end edge 13 of the frame 10 and forms an angle of 45 to 80 degrees with the gas flow direction. And the frame body 10 is symmetrically formed with a plurality of C-shaped buckles 14 at the ring 11 , and the C-shaped buckles 14 are formed with a notch 141 toward the rear edge 13 of the frame 10 , and a plurality of plates 20 are formed with a block a sheet 21 and an overlap formed on one side of the flap 21 22, the plate body 20 is further provided with a round bar 23 at both ends of the overlapping portion 22, so that the overlapping portion 22 of the plate body 20 can pass through the ring ring 11 from the front end edge 12 of the frame body 10, and is in the frame body 10. Then, on the side of the end edge 13 , the round bar 23 is embedded in the C-shaped buckle 14 from the notch 141 , so that the blocking piece 21 of the plate body 20 is pivoted with the round bar 23 as the axis yoke against the overlap of the ring 11 and the other plate body 20 . The portion 22 allows the gas to be pushed away from the rear end edge 13 of the frame 10 to the front end edge 12, and the gas is blocked by the plate body 20 and cannot be circulated from the front end edge 12 of the frame body 10 to the rear end edge 13. In order to achieve the function of preventing backflow, the plate body 20 is formed with a recess 221 in the overlapping portion 22, and the ring 11 of the frame body 10 or the lower edge of the flap 21 of the other plate body 20 is received by the recess 221 That is, when the panel 20 conceals the frame 10, a flat surface which is inclined obliquely is formed, thereby achieving the effect that the counterflow gas cannot open the panel 20 at an arbitrary angle.

For the actual use, please refer to FIG. 4 and FIG. 5 together with FIG. 2, and the overlapping portion 22 of the plate body 20 is passed through the ring 11 of the frame body 10 by the front end edge 12, and is in the frame. After the body 10 is at the end edge 13 , the round bar 23 is placed in the notch 141 of the C-shaped buckle 14 in a reverse manner, thereby quickly pivoting the plurality of plates 20 to the C-shaped buckle 14 of the frame 10 to form a position. The utility model has the advantages of convenient assembly, and allows the blocking piece 21 of the plate body 20 to lie against the overlapping portion 22 of the ring 11 of the frame body 10 or the other plate body 20 with the round bar 23 as an axis, thereby transmitting a plurality of plates. 20 concealed at the ring 11 of the frame 10, and according to the inclination angle of the ring 11, the plate 20 is directed toward the rear end edge 13 of the frame 10 and forms an angle of 45 to 80 degrees with the gas flow direction. When assembled in the exhaust duct, the exhaust gas is blown by the rear edge 13 of the frame body 10, and the weight of the plate body 20 is used to easily flip the plate body 20, so that the plate body 20 is rounded. The shaft is rotated at an appropriate angle to achieve the purpose of gas discharge, and when the outside air enters the front edge of the frame 10 in the reverse direction, due to the block 20 21 is pressed against the overlapping portion 22 of the ring 11 of the frame 10 and the other plate 20, so that the external air can be blocked from flowing through the frame 10, thereby preventing the use of the reverse flow. Further, the through-loop 11 is The inclination angle causes the plate body 20 to face the rear end edge 13 of the frame body 10 and forms an angle of 45 degrees to 80 degrees with the gas flow direction, so that the flap 21 of the plate body 20 can closely contact the ring 11 of the frame body 10 with the weight of the body. The overlapping portion 22 with the other plate body 20 not only has the function of eliminating the gap between the frame body 10 and the plate body 20, but also prevents the counterflow gas from opening the plate body 20 at an arbitrary angle, thereby effectively improving the single-guide flow and preventing it. The effect of countercurrent use.

In summary, the present invention has indeed achieved a breakthrough structural design, and has improved invention content, while at the same time achieving industrial utilization and progress, and the present invention is not found in Any publication is also novel. When it complies with the relevant provisions of the Patent Law, it submits an application for a patent for invention according to law, and invites the examination committee of the bureau to grant a legal patent right.

The above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto; that is, the equivalent variations and modifications made by the scope of the present invention should still belong to the present invention. Within the scope of the patent.

10‧‧‧ frame

11‧‧‧ Ring

12‧‧‧ front edge

13‧‧‧ rear edge

14‧‧‧C-shaped buckle

141‧‧ ‧ gap

20‧‧‧ board

21‧‧ ‧Flap

22‧‧‧ overlap

221‧‧‧ Groove

23‧‧‧ Round rod

Claims (2)

An anti-backflow device for an exhaust duct, comprising: a frame body, the frame system is formed with an inclined ring along the inner edge, and a front end edge and a rear end edge are formed by the ring spacer frame body, The angle of inclination of the ring is toward the rear end edge of the frame and forms an angle of 45 degrees to 80 degrees with the gas flow direction, and the frame body is symmetrically formed with a complex array of C-shaped buckles at the ring, and the C-shaped buckle A notch is formed toward the rear edge of the frame; and a plurality of plates are formed, the plate body is formed with a blocking piece, and an overlapping portion is formed on one side of the blocking piece, and the plate body is at both ends of the overlapping portion A round bar is convexly arranged, so that the overlapping portion of the plate body can pass through the ring edge from the front edge of the frame body, and the round bar is embedded in the C-shaped buckle from the notch on the side of the rear edge of the frame body to block the plate body. The yaw with the round rod as the axis oscillates against the overlapping portion of the ring and the other plate body, so that the gas can be pushed away from the rear end edge of the frame body to the front end edge, and the gas is blocked by the plate body. The front edge of the frame is circulated to the rear edge to achieve the function of preventing backflow. The anti-backflow device of the exhaust duct according to the first aspect of the invention, wherein the plate body is formed with a groove at the overlapping portion, and the groove or the other body is blocked by the groove. The lower edge of the film can form a sloped flat surface when the plate body conceals the frame body, thereby achieving the effect that the counterflow gas cannot open the plate body at any angle.