Door closer

Abstract

The door closer comprises a guide rail, a rocker arm and a driving device, the guide rail and the driving device are fixed to a door frame and a door leaf respectively, one end of the rocker arm is in driving connection with the driving device, and the other end of the rocker arm is slidably hinged to the guide rail. The driving device comprises a door closer shell, a plurality of pistons and a rotating shaft, wherein the pistons slide in the door closer shell in parallel, the rotating shaft is connected to the pistons in a driving mode, and the end, close to the guide rail, of the rotating shaft is connected to the rocker arm. The door closer is simple in structure, the multiple pistons are arranged in the door closer shell at the same time, and the power of the door closer is improved.

Description

Technical Field

[0001] This application relates to the technical field of door closers. Background Art

[0002] As a necessary facility device for modern buildings, door closers have been widely used in various fields of society. With the continuous development and progress of society, the country has higher and higher requirements for fire protection and security. Many passage doors and fire doors need to be installed with door closers; for some door closers, for the need of beautifying the appearance, etc., they are integrally embedded in the door leaf or door frame. Affected by the thickness of the door leaf, the thickness of the door closer housing is limited, resulting in a limited diameter of the piston, further resulting in a limited strength of the piston and a limited overall force of the door closer, which limits the application range of the door closer. Therefore, improvements are needed. Utility Model Content

[0003] The purpose of the present utility model is to provide a door closer to overcome the deficiencies in the prior art.

[0004] To achieve the above purpose, the present utility model provides the following technical solutions:

[0005] The present utility model discloses a door closer, including a guide rail, a rocker arm and a driving device. The guide rail and the driving device are respectively fixed to the door frame and the door leaf. One end of the rocker arm is drivingly connected to the driving device, and the other end is slidably hinged to the guide rail. The driving device includes a door closer housing, a plurality of pistons sliding in parallel in the door closer housing, and a rotating shaft drivingly connected to the plurality of pistons. One end of the rotating shaft close to the guide rail is connected to the rocker arm.

[0006] Further, in the above door closer, a plurality of oil cavities are provided in parallel in the door closer housing. The pistons are slidably arranged in the corresponding oil cavities. Both ends of the oil cavity are blocked by a front end cover and a rear end cover respectively. A spring is arranged between the piston and the rear end cover.

[0007] Further, in the above door closer, a plurality of regulating valves communicating with the oil cavity are provided on the door closer housing.

[0008] Further, in the above door closer, a plurality of communication holes are provided between adjacent oil cavities.

[0009] Further, in the above door closer, a driving cavity is provided in the piston. A plurality of internal teeth are provided on the side wall of the driving cavity. External teeth meshing with the internal teeth are provided on the surface of the rotating shaft.

[0010] Further, in the above door closer, the rotating shaft is integrally formed.

[0011] Further, in the above door closer, the rotating shaft is of a multi-section structure.

[0012] Further, in the above door closer, mounting pieces are respectively connected to both ends of one side of the door closer housing close to the rocker arm.

[0013] Compared with the prior art, the door closer of the present utility model has a simple structure. Multiple pistons are arranged in the door closer housing at the same time to improve the power of the door closer. Multiple oil cavities and the corresponding pistons are arranged in parallel without changing the thickness of the door closer housing, and the force is evenly distributed to multiple pistons, prolonging the service life of the pistons. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 Shown is a schematic structural diagram of the door closer omitting the guide rail and the rocker arm in a specific embodiment of the present utility model.

[0016] Figure 2 Shown is a schematic structural diagram of the door closer housing in a specific embodiment of the present utility model.

[0017] Figure 3 Shown is a schematic transmission diagram of the rotating shaft and the piston in a specific embodiment of the present utility model.

[0018] Figure 4 Shown is a schematic structural diagram of the rotating shaft in a specific embodiment of the present utility model.

[0019] Figure 5 Shown is a schematic structural diagram of the rotating shaft in another specific embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will combine the drawings in the embodiments of the present utility model to describe the technical solutions in the embodiments of the present utility model in detail. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0021] Combined with Figures 1 to 5As shown in the figure, a door closer includes a guide rail (not shown), a rocker arm (not shown), and a driving device. The guide rail and the driving device are respectively fixed to the door frame and the door leaf. One end of the rocker arm is drivingly connected to the driving device, and the other end is slidably hinged to the guide rail. The driving device includes a door closer housing 1, a plurality of pistons 2 slidably arranged in the door closer housing 1, and a rotating shaft 3 drivingly connected to the plurality of pistons 2. One end of the rotating shaft 3 close to the guide rail is connected to the rocker arm.

[0022] In this technical solution, both the guide rail and the rocker arm can utilize existing structures. The door closer extends along its height direction (the direction of being embedded in the door leaf / door frame, the length direction of the door leaf), and is provided with a plurality of oil cavities arranged in parallel. Each oil cavity is provided with a sliding piston. The rotating shaft is simultaneously drivingly connected to all the pistons. Without changing the thickness of the door closer (in the thickness direction of the door leaf), it can still be embedded in the door leaf or the door frame. Its door closer housing is an integral structure, which is beneficial to reducing the volume and avoiding external splicing structures, etc. The structure of this door closer is simple. Multiple pistons are arranged in the door closer housing at the same time, which improves the power of the door closer. The plurality of oil cavities and the corresponding pistons are arranged in parallel, without changing the thickness of the door closer housing, and the force is evenly distributed to multiple pistons, extending the service life of the pistons.

[0023] Exemplarily, refer to Figures 1 to 3 As shown in the figure, a plurality of oil cavities 11 arranged in parallel are opened in the door closer housing 1. The pistons 2 are slidably arranged in the corresponding oil cavities 11. Both ends of the oil cavity 11 are blocked by a front end cover 4 and a rear end cover 5 respectively. A spring 6 is arranged between the piston 2 and the rear end cover 5.

[0024] In this technical solution, the front end cover, the rear end cover, and the spring are all conventional structures. The front end cover and the rear end cover are disassembled and assembled to the ends of the corresponding oil cavities through a threaded structure, and a conventional sealing ring is configured to seal both ends of the oil cavity. Conventional oil channels, pressure relief valves / check valves, etc. are also arranged in the piston. When opening the door, multiple pistons simultaneously pressurize the corresponding springs. After the external force for opening the door is removed, the springs release elastic potential energy, pushing the pistons to reset, thereby realizing automatic door closing.

[0025] Exemplarily, refer to Figure 2 As shown in the figure, a plurality of regulating valves 7 communicating with the oil cavities 11 are arranged on the door closer housing 1.

[0026] In this technical solution, a conventional control oil channel (not shown) is arranged in the door closer housing, and a conventional regulating valve is configured to regulate the flow rate of the oil in the oil cavity, etc., so as to regulate the closing speed of the door. The regulating valve is arranged on the exposed surface (the side exposed to the air) of the door closer housing, which is convenient for operation.

[0027] Exemplarily, refer to Figure 1 As shown in the figure, a plurality of communication holes 12 are arranged between adjacent oil cavities 11.

[0028] In this technical solution, the oil cavities are interconnected through communication holes, and all the oil cavities are synchronously connected to the control oil passage and the regulating valve.

[0029] Exemplarily, referring to Figures 1 to 5 As shown, a driving cavity 21 is formed in the piston 2, a plurality of internal teeth 211 are provided on the side wall of the driving cavity 21, and external teeth 31 meshing with the internal teeth 211 are provided on the surface of the rotating shaft 3.

[0030] In this technical solution, the piston can directly utilize the existing structure. One end of the rotating shaft is rotatably connected to the inner wall of the door closer housing through a conventional bearing, etc., and the other end is rotatably connected to the corresponding side wall of the door closer housing through a conventional end cover and bearing and protrudes from the door closer housing. It is connected to the rocker arm. The external teeth of the rotating shaft are simultaneously meshed with all the pistons to synchronously drive the pistons or be synchronously driven by the pistons.

[0031] Exemplarily, referring to Figure 4 As shown, the rotating shaft 3 is integrally formed.

[0032] In this technical solution, the rotating shaft is integrally formed, which is convenient for installation.

[0033] Exemplarily, referring to Figure 5 As shown, the rotating shaft 3 is a multi-section structure.

[0034] In this technical solution, the rotating shaft is formed by splicing multi-section shafts. External teeth are processed on the surface of each section of the shaft. Adjacent rotating shafts are connected by structures such as protruding prisms and corresponding polygonal blind holes, or threaded structures, or through couplings, etc., as long as the synchronous rotation of the rotating shaft can be achieved. The multi-section structure is convenient for processing.

[0035] Exemplarily, referring to Figure 1 and Figure 2 As shown, mounting pieces 8 are respectively connected to both ends of one side of the door closer housing 1 close to the rocker arm.

[0036] In this technical solution, the mounting piece is determined according to the actual installation conditions of the door closer housing, and the door closer housing can be fixed at the corresponding position of the door leaf / door frame.

[0037] In summary, the door closer of the present utility model has a simple structure. Multiple pistons are arranged in the door closer housing at the same time to improve the power of the door closer. Multiple oil cavities and the corresponding pistons are arranged in parallel, without changing the thickness of the door closer housing, evenly distributing the force to multiple pistons, and prolonging the service life of the pistons.

[0038] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0039] The above is only the specific implementation manner of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A door closer, characterized in that, It includes a guide rail, a rocker arm and a driving device. The guide rail and the driving device are respectively fixed to the door frame and the door leaf. One end of the rocker arm is drivingly connected to the driving device, and the other end is slidably hinged to the guide rail. The driving device includes a closer housing, a plurality of pistons sliding in parallel in the closer housing, and a rotating shaft drivingly connected to the plurality of pistons. One end of the rotating shaft close to the guide rail is connected to the rocker arm.

2. The door closer according to claim 1, characterized in that: A plurality of oil cavities are provided in parallel in the closer housing. The pistons are slidably arranged in the corresponding oil cavities. Both ends of the oil cavity are sealed by a front end cover and a rear end cover respectively. A spring is arranged between the piston and the rear end cover.

3. The door closer according to claim 2, characterized in that: A plurality of regulating valves communicating with the oil cavity are arranged on the closer housing.

4. The door closer according to claim 2, wherein: A plurality of communication holes are arranged between adjacent oil cavities.

5. The door closer according to claim 1, characterized in that: A driving cavity is provided in the piston. A plurality of internal teeth are arranged on the side wall of the driving cavity. External teeth meshing with the internal teeth are arranged on the surface of the rotating shaft.

6. The door closer according to any one of claims 1 to 5, characterized in that: The rotating shaft is integrally formed.

7. The door closer according to any one of claims 1 to 5, characterized in that: The rotating shaft is of a multi-section structure.

8. The door closer according to claim 1, characterized in that: Mounting pieces are respectively connected to both ends of one side of the closer housing close to the rocker arm.

Images