Blade mounting structure of fire damper

Abstract

The utility model discloses a blade mounting structure of a fire damper, which comprises a rotating shaft, a blade and a connecting piece, positioning bulges are extruded on the rotating shaft, two positioning bulges form a group, at least two groups of bulges are arranged on the rotating shaft, a semicircular groove is pressed in the middle of the blade, the rotating shaft is exactly embedded into the groove of the blade, and the connecting piece is arranged on the rotating shaft. The connecting piece is a square plate, a semicircular groove is pressed in the middle of the connecting piece, the four corners of the connecting piece are fixedly connected to the blade through bolts, meanwhile, the connecting piece is matched with the groove of the blade and wraps and clamps the rotating shaft, a strip-shaped hole is correspondingly formed in the groove of the connecting piece, and the positioning protrusion on the rotating shaft is embedded into the strip-shaped hole. The mode that the connecting plates are connected with the main shaft more conveniently is adopted, the positioning protrusions are extruded on the rotating shaft and matched with the strip-shaped holes of the connecting pieces, effective stress supporting is formed, the blades are effectively driven to turn over when the rotating shaft rotates, and the mode facilitates installation, reduces cost and improves connection firmness.

Description

Technical Field

[0001] This utility model relates to the technical field of fire damper auxiliary equipment, specifically a blade mounting structure for a fire damper. Background Technology

[0002] A fire damper is a type of valve controlled by a shape memory alloy, which closes using gravity and a spring mechanism. Newer products also utilize the deformation of the shape memory alloy to close the valve. Its function is to automatically close the valve when the smoke temperature reaches 70℃ or 280℃, by which time most people have already evacuated and smoke extraction is no longer practical. Since the smoke is already ignited, the valve automatically closes to prevent the fire from spreading.

[0003] When the blades of a fire damper are activated, they are rotated by a shaft. However, most existing methods of connecting the blades and the shaft use welding or connecting plates. While welding is strong, it is complicated to manufacture and requires high precision. In order to improve the strength, connecting plates often use a shaft with a polygonal cross-section, which results in higher costs and limited improvement in strength. Summary of the Invention

[0004] The purpose of this invention is to provide a blade mounting structure for a fire damper to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a blade mounting structure for a fire damper, comprising: a rotating shaft, blades, and a connecting piece. The upper and lower ends of the rotating shaft are movably connected to the frame of the fire damper. Positioning protrusions are pressed onto the rotating shaft, and the positioning protrusions are arranged in pairs. At least two sets of protrusions are provided on the rotating shaft. A semi-circular groove is pressed into the middle position of the blade, and the rotating shaft is precisely embedded in the groove of the blade. The connecting piece is a square plate, and a semi-circular groove is pressed into the middle position of the connecting piece. The four corners of the connecting piece are fixed to the blade by bolts. At the same time, the grooves of the connecting piece and the blade match each other and clamp the rotating shaft. A strip hole is correspondingly opened on the groove of the connecting piece, and the positioning protrusions on the rotating shaft are embedded in the strip hole.

[0006] Furthermore, the rotating shaft is movably connected to the frame of the fire damper via a connecting seat. The connecting seat is shaped like a "Z" and has an inverted U-shaped elastic sealing sheet on top, with a through hole on the elastic sealing sheet for the rotating shaft to pass through.

[0007] Furthermore, the positioning protrusion is a raised area formed by opposing stamping.

[0008] Compared with the prior art, the beneficial effects of this utility model are:

[0009] 1. The blade installation structure of the fire damper of this utility model adopts a more convenient connection plate to the main shaft. By extruding positioning protrusions on the rotating shaft and cooperating with the strip holes of the connecting plate, an effective force support is formed. When the rotating shaft rotates, it effectively drives the blade to rotate. This method is convenient for installation, reduces costs, and improves the firmness of the connection.

[0010] 2. The blade installation structure of the fire damper of this utility model improves the sealing performance of the blade by attaching an elastic sealing sheet above the connecting seat.

[0011] 3. The blade mounting structure of the fire damper of this utility model has a positioning protrusion formed by opposing stamping, which is easy to process, the amount of protrusion is controllable, and the adaptability is good.

[0012] This utility model has the advantages of simple structure, safety and effectiveness, and good performance. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the rotating shaft structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the cross-sectional structure of the positioning protrusion of this utility model;

[0016] In the diagram: 1-shaft; 2-blade; 3-connecting piece; 4-positioning protrusion; 5-strip hole; 6-connecting seat; 7-elastic sealing piece. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1 , 23. This utility model provides a blade installation structure for a fire damper, including: a rotating shaft 1, a blade 2, and a connecting piece 3. The upper and lower ends of the rotating shaft 1 are movably connected to the frame of the fire damper. The rotating shaft 1 has positioning protrusions 4 pressed on it, and the positioning protrusions 4 are in groups of two. The rotating shaft 1 is provided with at least two groups of protrusions. The blade 2 has a semi-circular groove pressed in the middle position, and the rotating shaft 1 is precisely embedded in the groove of the blade 2. The connecting piece 3 is a square plate, and the connecting piece 3 has a semi-circular groove pressed in the middle position. The four corners of the connecting piece 3 are fixed to the blade 2 by bolts. At the same time, the groove of the connecting piece 3 matches each other with the groove of the blade 2 and clamps the rotating shaft 1. The groove of the connecting piece 3 has a corresponding strip hole 5, and the positioning protrusions 4 on the rotating shaft 1 are embedded in the strip hole 5. The main shaft is connected by a more convenient connecting plate. By pressing out the positioning protrusion 4 on the rotating shaft 1, and cooperating with the strip hole 5 of the connecting plate 3, an effective force support is formed. When the rotating shaft 1 rotates, it effectively drives the blade 2 to flip. This method is convenient for installation, reduces costs, and improves the firmness of the connection.

[0019] Furthermore, the rotating shaft 1 is movably connected to the frame of the fire damper via a connecting seat 6. The connecting seat 6 is shaped like a "Z" and has an inverted U-shaped elastic sealing sheet 7 on top, with a corresponding through hole for the rotating shaft 1 to pass through. By fitting the elastic sealing sheet 7 onto the connecting seat 6, the sealing performance of the blade 2 is improved.

[0020] Furthermore, the positioning protrusion 4 is a raised area formed by opposing stamping. The positioning protrusion 4 is formed by opposing stamping, which is convenient to process, the amount of protrusion is controllable, and the adaptability is good.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A blade mounting structure for a fire damper, characterized in that, include: The rotating shaft (1), blade (2), and connecting piece (3) are movably connected to the frame of the fire damper at both ends. The rotating shaft (1) has positioning protrusions (4) pressed on it, and the positioning protrusions (4) are in groups of two. The rotating shaft (1) has at least two groups of protrusions. The blade (2) has a semi-circular groove pressed in the middle position, and the rotating shaft (1) is just embedded in the groove of the blade (2). The connecting piece (3) is a square plate. The connecting piece (3) has a semi-circular groove pressed in the middle position. The four corners of the connecting piece (3) are fixed to the blade (2) by bolts. At the same time, the groove of the connecting piece (3) matches and clamps the rotating shaft (1). The groove of the connecting piece (3) has a corresponding strip hole (5). The positioning protrusions (4) on the rotating shaft (1) are embedded in the strip hole (5).

2. The blade mounting structure of a fire damper according to claim 1, characterized in that, The rotating shaft (1) is movably connected to the frame of the fire damper via a connecting seat (6). The connecting seat (6) is shaped like a zigzag. An inverted U-shaped elastic sealing sheet (7) is provided above the connecting seat (6), and a through hole is correspondingly opened on the elastic sealing sheet (7) for the rotating shaft (1) to pass through.

3. The blade mounting structure of a fire damper according to claim 1, characterized in that, The positioning protrusion (4) is a raised part formed by opposing stamping.

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