Normally closed fireproof door

Abstract

The utility model discloses a normally-closed fireproof door which comprises a door body, a door frame and a door closer arranged between the door body and the door frame. The door closer comprises a fixed seat arranged on the door body, a rotating shaft arranged on the fixed seat and a connecting unit arranged on the rotating shaft and connected with the door body; a friction wheel is arranged on the rotating shaft, a damping wheel in extrusion contact with the friction wheel is arranged on the door body, and the damping wheel is used for applying resistance to the friction wheel to slow down the rotating speed of the friction wheel; an elastic piece is arranged between the damping wheel and the door body; according to the damping wheel for the normally-closed fireproof door, the speed of a door closer when a door body is closed can be reduced through the damping wheel, so that the impact of the door body on a door frame when the door body is closed due to the dead weight is reduced, the service life of the fireproof door is prolonged, and the reliability of the fireproof door is improved.

Description

Technical Field

[0001] This utility model relates to the field of fire door technology, and in particular to normally closed fire doors. Background Technology

[0002] With the acceleration of urbanization and the surge in the number of buildings, fire safety is receiving increasing attention. Among various building safety facilities, fire doors are a crucial component. They not only prevent the spread of fire but also effectively isolate smoke, playing an extremely important role in protecting people's lives.

[0003] Fire doors are mostly made of metal. Normally closed fire doors are named for their ability to remain closed in non-emergency situations. This allows them to function immediately in the event of a fire, preventing flames and toxic gases from spreading to other areas through corridors and other passageways.

[0004] Existing normally closed fire doors are used in conjunction with mechanical door closers to achieve their automatic closing function, but they still have the following disadvantages and deficiencies during use:

[0005] Because fire doors are usually made of metal and have a high overall weight, when used with a door closer, the closing force should not be too large to facilitate opening the fire door. When the closing force is too small, the fire door will hit the door frame due to its own inertia during the automatic closing process after being opened by the door closer, which will affect the service life of the door and the door frame.

[0006] When the closing force is large, the force required to open the door is also large, making it difficult to open. Utility Model Content

[0007] This utility model addresses the shortcomings of existing technologies by providing a normally closed fire door.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a normally closed fire door, comprising a door body, a door frame, and a door closer disposed between the door body and the door frame.

[0009] In the above scheme, preferably, the door closer includes a fixed seat on the door body, a rotating shaft on the fixed seat, and a connecting unit on the rotating shaft and connected to the door body.

[0010] A friction wheel is provided on the rotating shaft, and a damping wheel is provided on the door body to press against the friction wheel. The damping wheel is used to apply resistance to the friction wheel to slow down the rotation speed of the friction wheel.

[0011] An elastic element is installed between the damping wheel and the door body.

[0012] In the above scheme, preferably, the friction wheel is provided with a plurality of friction teeth evenly.

[0013] In the above scheme, preferably, the damping wheel is a rubber wheel.

[0014] In the above scheme, preferably, a bracket for mounting a damping wheel is slidably provided on the door body, and the elastic element is disposed between the bracket and the door body.

[0015] In the above scheme, preferably, a one-way bearing is provided between the damping wheel and the bracket.

[0016] In the above scheme, preferably, the door body is provided with a guide plate, the bracket is provided with a guide rod that cooperates with the guide plate, and the elastic element is provided between the guide plate and the bracket.

[0017] In the above scheme, preferably, the guide rod is provided with a traction component, the door body is provided with a handle, and the handle is provided with a rotating plate connected to the traction component.

[0018] In the above scheme, preferably, the door body is provided with a fixing cover that cooperates with the handle, the door body is provided with a pull rope plate, one end of the traction member is connected to the guide rod, and the other end is connected to the rotating plate after passing through the pull rope plate and the fixing cover in sequence.

[0019] In the above scheme, preferably, the bracket is provided with an axle, and the one-way bearing is provided on the axle.

[0020] In the above scheme, preferably, the connecting unit includes a first swing arm and a second swing arm, one end of the first swing arm is fixed on the rotating shaft, and the other end is rotatably connected to the second swing arm;

[0021] One end of the second swing arm is connected to the first swing arm, and the other end is rotatably connected to the door frame.

[0022] The beneficial effects of this utility model are: This utility model provides a damping wheel for normally closed fire doors. The damping wheel can slow down the speed of the door closer when the door is closing, thereby reducing the impact of the door body on the door frame due to its own weight when closing, and improving the service life and reliability of the fire door. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the present invention.

[0024] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0025] Figure 3 This is a schematic diagram of the mating structure of the friction wheel and damping wheel of the present invention.

[0026] Figure 4 This is a three-dimensional structural diagram of the handle of the present invention. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments: See below Figures 1-4 .

[0028] A normally closed fire door includes a door body 1, a door frame 2, and a door closer 3 located between the door body 1 and the door frame 2; such as Figures 1-2 As shown, the door closer 3 includes a fixed base 301, a rotating shaft 302 disposed on the fixed base 301, and a connecting unit disposed on the rotating shaft 302 and connected to the door body 1.

[0029] The connecting unit includes a first swing arm 5 and a second swing arm 6. In this embodiment, the fixing seat 301 is fixed to the door body 1. One end of the first swing arm 5 is fixed to the rotating shaft 302, and the other end is rotatably connected to the second swing arm 6. One end of the second swing arm 6 is rotatably connected to the first swing arm 5 via a pin, and the other end is rotatably connected to the door frame 2, thereby... Figure 1 In the state shown, when the door 1 is opened from the inside to the outside, because one end of the second swing rod 6 is rotatably mounted on the door frame 2, the fixed seat 301 moves with the door 1 and then drives the rotating shaft to rotate clockwise through the traction of the first swing rod 5 and the second swing rod 6. In addition, the door closer is conventionally set up, which will not be described in detail here.

[0030] A friction wheel 303 is fixed on the journal of the rotating shaft 302, that is, the friction wheel 303 rotates with the rotation of the rotating shaft 302; a damping wheel 101 is provided on the door body 1 to press against the friction wheel 303. The damping wheel 101 is used to apply resistance to the friction wheel 303 to slow down the rotation speed of the friction wheel 303. The material of the damping wheel 101 is preferably rubber. A number of friction teeth 304 are evenly arranged around the circumference on the outer edge surface of the friction wheel 303, thereby increasing the resistance between the friction wheel 303 and the damping wheel 101.

[0031] In this embodiment, a guide plate 105 is fixedly installed on the door body 1. A bracket 103 for mounting a damping wheel 101 is slidably mounted on the guide plate 105. The damping wheel 101 is rotatably connected to the bracket 103 via a wheel axle 108. Further, the inner hole of the damping wheel 101 is connected to the wheel axle 108 via a one-way bearing 104. The one-way bearing 104 is oriented as follows: Figure 3 As shown, that is, in Figure 3 In this state, the damping wheel 101 can only rotate counterclockwise. In this state, when the friction wheel 303 rotates counterclockwise, the damping wheel 101 applies frictional resistance to the friction wheel 303 under the action of the one-way bearing 104, thereby reducing the rotational speed of the friction wheel 303.

[0032] like Figures 2-3As shown, the right end of the bracket 103 is connected to the damping wheel 101, and the left end is fixed with a guide rod 106 that cooperates with the guide plate 105. The guide rod 106 is a hexagonal rod, and its left end is guided through the guide plate 105. An elastic element 102 is provided between the bracket 103 and the guide plate 105. The elastic element 102 is a spring, which is sleeved on the guide rod 106 and its two ends abut against the guide plate 105 and the bracket 103 respectively, thereby increasing the squeezing force of the damping wheel 101 on the friction wheel 303.

[0033] The guide rod 106 is provided with a traction member 107. Preferably, the traction member 107 is a pull rope. One end of the traction member 107 is fixed to the end of the guide rod 106, and the other end is guided and passed through the pull rope plate 403 of the door body 1. The door body 1 is provided with a handle 4. The handle 4 is provided with a rotating plate 401 connected to the traction member 107. That is, after the traction member 107 passes through the pull rope plate 403, it extends downward and is fixedly connected to the rotating plate 401 on the handle 4. The door body 1 is provided with a fixing cover 402 that cooperates with the handle 4. One end of the traction member 107 is connected to the guide rod 106, and the other end passes through the pull rope plate 403 and the fixing cover 402 in sequence and is connected to the rotating plate 401.

[0034] When in use, turn the handle 4 to make the rotating plate 401 rotate synchronously with the handle 4. After the rotating plate 401 rotates, it pulls the traction member 107 to move the guide rod 106. This causes the bracket 103 to compress the elastic member 102, and the damping wheel 101 to move away from the friction wheel 303. That is, when the door 1 needs to be opened, the user can turn the handle 4 to open the door and make the opening resistance smaller.

[0035] When the door 1 closes automatically, the handle 4 resets, and the bracket 103, under the elastic force of the elastic element 102, causes the damping wheel 101 to press against the friction wheel 303. At this time, because one end of the second swing arm 6 is rotatably mounted on the door frame 2, the fixed seat 301, after moving with the door 1, drives the rotating shaft 302 through the traction of the first swing arm 5 and the second swing arm 6. Figure 3 When the friction wheel 303 rotates clockwise in the state shown, the damping wheel 101 remains stationary under the action of the one-way bearing 104. The friction wheel 303 slows down its rotation after receiving the resistance of the damping wheel 101, thereby reducing the speed of the door 1 when it closes, reducing the impact on the door frame 2, increasing the service life of the door 1 and the door frame 2, and reducing the noise when closing the door.

[0036] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A normally closed fire door, comprising a door body (1), a door frame (2), and a door closer (3) disposed between the door body (1) and the door frame (2), characterized in that: The door closer (3) includes a fixed seat (301) on the door body (1), a rotating shaft (302) on the fixed seat (301), and a connecting unit on the rotating shaft (302) and connected to the door body (1); A friction wheel (303) is provided on the rotating shaft (302), and a damping wheel (101) is provided on the door body (1) to press against the friction wheel (303). The damping wheel (101) is used to apply resistance to the friction wheel (303) to slow down the rotation speed of the friction wheel (303). An elastic element (102) is provided between the damping wheel (101) and the door body (1).

2. The normally closed fire door according to claim 1, characterized in that: The friction wheel (303) is uniformly provided with a plurality of friction teeth (304).

3. The normally closed fire door according to claim 1, characterized in that: The damping wheel (101) is a rubber wheel.

4. The normally closed fire door according to claim 1, characterized in that: The door body (1) is slidably provided with a bracket (103) for installing a damping wheel (101), and the elastic element (102) is provided between the bracket (103) and the door body (1).

5. The normally closed fire door according to claim 1, characterized in that: A one-way bearing (104) is provided between the damping wheel (101) and the bracket (103).

6. The normally closed fire door according to claim 4, characterized in that: The door body (1) is provided with a guide plate (105), the bracket (103) is provided with a guide rod (106) that cooperates with the guide plate (105), and the elastic element (102) is provided between the guide plate (105) and the bracket (103).

7. The normally closed fire door according to claim 6, characterized in that: The guide rod (106) is provided with a traction member (107), the door body (1) is provided with a handle (4), and the handle (4) is provided with a rotating plate (401) connected to the traction member (107).

8. The normally closed fire door according to claim 7, characterized in that: The door body (1) is provided with a fixed cover (402) that cooperates with the handle (4). The door body (1) is provided with a pull rope plate (403). One end of the traction member (107) is connected to the guide rod (106), and the other end is connected to the rotating plate (401) after passing through the pull rope plate (403) and the fixed cover (402) in sequence.

9. The normally closed fire door according to claim 5, characterized in that: The bracket (103) is provided with an axle (108), and the one-way bearing (104) is provided on the axle (108).

10. The normally closed fire door according to claim 1, characterized in that: The connecting unit includes a first swing rod (5) and a second swing rod (6). One end of the first swing rod (5) is fixed on the rotating shaft (302), and the other end is rotatably connected to the second swing rod (6). One end of the second swing rod (6) is connected to the first swing rod (5), and the other end is rotatably connected to the door frame (2).

Images