Explosion-proof door closer

Abstract

The application discloses an explosion-proof door closer, which comprises a shell, an oil cavity filled with hydraulic oil, a piston sliding in the oil cavity and a rotating shaft rotating along with the opening and closing of a door leaf. The rotating shaft drives the piston through cam transmission or gear transmission. The two ends of the oil cavity are respectively sealed by end covers. Mounting holes communicating with the oil cavity are arranged in the shell or the end covers. Explosion-proof valves are arranged in the mounting holes. The explosion-proof valves are integrally formed by thermoplastic materials. The explosion-proof door closer has simple structure. The explosion-proof valves can avoid the explosion of the hydraulic oil under high temperature, thereby improving the safety in use.

Description

Technical Field

[0001] This application relates to the field of door closer technology, and in particular to an explosion-proof door closer. Background Technology

[0002] Door closers, as essential facilities in modern buildings, are widely used in various sectors of society. With continuous social development and progress, national requirements for fire protection and security are becoming increasingly stringent, necessitating the installation of door closers on many passageways and fire doors. Among these, hydraulic door closers, to ensure proper operation, have sealed hydraulic oil chambers. In high-temperature conditions such as fires, the pressure of the hydraulic oil within the chamber increases with temperature, potentially causing the casing to rupture. The hydraulic oil ejected from the ruptured casing, or the fine streams of hydraulic oil seeping from end caps, can easily atomize, posing a risk of flash explosion. Therefore, improvements are needed. Utility Model Content

[0003] The purpose of this invention is to provide an explosion-proof door closer to overcome the shortcomings of the existing technology.

[0004] To achieve the above objectives, this utility model provides the following technical solution: This utility model discloses an explosion-proof door closer, including a housing, an oil chamber filled with hydraulic oil, a piston sliding in the oil chamber, and a rotating shaft that rotates with the opening and closing of the door. The rotating shaft drives the piston through a cam drive or gear drive. The two ends of the oil chamber are sealed by end caps. The housing or end caps are provided with mounting holes communicating with the oil chamber. An explosion-proof valve is provided in the mounting holes. The explosion-proof valve is integrally formed from thermoplastic material.

[0005] Furthermore, in the aforementioned explosion-proof door closer, the explosion-proof valve is installed in the mounting hole via a threaded structure.

[0006] Furthermore, in the aforementioned explosion-proof door closer, the mounting hole includes a pressure hole, a threaded hole, and a guide hole arranged in sequence. The pressure hole is connected to the oil chamber, and the explosion-proof valve includes a stud corresponding to the threaded hole and a sealing post corresponding to the guide hole.

[0007] Furthermore, in the aforementioned explosion-proof door closer, the pressure hole, threaded hole, and guide hole are coaxially arranged.

[0008] Furthermore, in the aforementioned explosion-proof door closer, the outer wall of the sealing column is provided with a sealing groove, and a sealing ring is embedded therein to seal between the sealing column and the inner wall of the guide hole.

[0009] Furthermore, in the aforementioned explosion-proof door closer, a force-applying groove is provided on the outer end face of the sealing column.

[0010] Furthermore, in the aforementioned explosion-proof door closer, a sealing gasket is provided on the inner end face of the stud.

[0011] Compared with the prior art, the explosion-proof door closer of this utility model has a simple structure. The explosion-proof valve, which is integrally molded from thermoplastic material, softens after the temperature rises and is pushed out by hydraulic oil. The hydraulic oil is discharged as a whole, which prevents the pressure inside the door closer from continuing to rise. At the same time, a large amount of hydraulic oil is discharged, reducing the possibility of atomization, thereby reducing the possibility of explosion. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 The diagram shown is a structural schematic of an explosion-proof door closer in a specific embodiment of this utility model.

[0013] Figure 2 The diagram shown is an installation schematic of the explosion-proof valve in a specific embodiment of this utility model.

[0014] Figure 3 The diagram shown is a schematic diagram of the mounting hole in a specific embodiment of this utility model.

[0015] Figure 4 The diagram shown is a structural schematic of the explosion-proof valve in a specific embodiment of this utility model. Detailed Implementation

[0016] The technical solutions of the present utility model will be described in detail below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0017] Combination Figures 1 to 4 As shown, an explosion-proof door closer includes a housing 1, an oil chamber filled with hydraulic oil, a piston sliding in the oil chamber, and a rotating shaft that rotates with the opening and closing of the door. The rotating shaft drives the piston through a cam drive or gear drive. The two ends of the oil chamber are sealed by end caps 2. The housing 1 or the end caps 2 are provided with mounting holes 3 communicating with the oil chamber. An explosion-proof valve 4 is provided in the mounting holes 3. The explosion-proof valve 4 is integrally formed of thermoplastic material.

[0018] In this technical solution, the oil chamber, piston, and shaft are all existing structures. The housing also contains conventional structures such as springs, speed control valves, and oil passages, which will not be described in detail here. Conventional O-rings are used at the connection between the end cap and the housing to ensure sealing performance. The thermoplastic material is a conventional material that softens when heated, such as polyethylene, polypropylene, and polyoxymethylene. As the temperature rises (e.g., 80~170℃, the corresponding softening temperature and material are selected according to the actual use environment, such as the softening temperature of polypropylene, which is usually around 155℃), it gradually softens and is pushed out by the increased pressure of the hydraulic oil. The hydraulic oil is discharged as a whole, avoiding the housing from bursting due to the continued increase in pressure inside the housing. At the same time, a large amount of hydraulic oil is discharged, reducing the possibility of atomization, thereby reducing the possibility of explosion.

[0019] For example, see Figures 2 to 4 As shown, the explosion-proof valve 4 is installed in the mounting hole 3 via a threaded structure.

[0020] In this technical solution, the explosion-proof valve is installed in the mounting hole through a conventional threaded structure, which facilitates processing and installation and reduces costs.

[0021] For example, see Figures 2 to 4 As shown, the mounting hole 3 includes a pressure hole 31, a threaded hole 32 and a guide hole 33 arranged in sequence. The pressure hole 31 is connected to the oil cavity. The explosion-proof valve 4 includes a stud 41 corresponding to the threaded hole 32 and a sealing post 42 corresponding to the guide hole 33. The pressure hole 31, the threaded hole 32 and the guide hole 33 are arranged coaxially.

[0022] In this technical solution, the radii of the pressure hole, threaded hole, and guide hole increase sequentially. The pressure hole is connected to the oil cavity, so the pressure energy of the hydraulic oil can act on the explosion-proof valve. The pressure hole, threaded hole, and guide hole are coaxially arranged, which facilitates processing and allows the hydraulic oil to act directly on the explosion-proof valve along the axial direction of the valve. As the temperature rises, the explosion-proof valve softens as a whole, and the stud can no longer engage with the threaded hole. The hydraulic oil pushes the explosion-proof valve out, and the entire hydraulic oil is discharged.

[0023] For example, see Figures 2 to 4 As shown, the outer wall of the sealing column 42 is provided with a sealing groove (not shown), and a sealing ring 5 is embedded therein to seal between the sealing column 42 and the inner wall of the guide hole 33.

[0024] In this technical solution, existing sealing rings can be used to improve the sealing performance between the explosion-proof valve and the mounting hole, thereby ensuring the sealing performance of the oil cavity and ensuring the normal operation of the door closer.

[0025] For example, see Figures 2 to 4 As shown, the outer end face of the sealing column 42 is provided with a force-applying groove.

[0026] In this technical solution, the outer end face of the sealing column (the side facing away from the oil cavity) is machined with conventional slots or cross slots for applying force, which can be used with conventional tools to disassemble and assemble the explosion-proof valve, making it convenient to operate.

[0027] For example, see Figures 2 to 4 As shown, a sealing gasket (not shown) is provided on the inner end face of the stud 41.

[0028] In this technical solution, a conventional sealing gasket is provided on the inner end face of the stud (the end face near the oil cavity) to improve the sealing performance of the explosion-proof valve installation location.

[0029] In summary, the explosion-proof door closer of this utility model has a simple structure. The explosion-proof valve, which is integrally molded from thermoplastic material, softens after the temperature rises and is pushed out by hydraulic oil. The hydraulic oil is discharged as a whole, which prevents the pressure inside the door closer from continuing to rise. At the same time, a large amount of hydraulic oil is discharged, reducing the possibility of atomization and thus reducing the possibility of explosion.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An explosion-proof door closer, characterized in that, The device includes a housing, which contains an oil chamber filled with hydraulic oil, a piston sliding within the oil chamber, and a rotating shaft that rotates with the opening and closing of a door. The rotating shaft drives the piston via a cam drive or gear drive. Both ends of the oil chamber are sealed by end caps. The housing or end caps have mounting holes communicating with the oil chamber. An explosion-proof valve is installed in the mounting holes. The explosion-proof valve is integrally formed from thermoplastic material.

2. The explosion-proof door closer according to claim 1, characterized in that: The explosion-proof valve is installed in the mounting hole via a threaded structure.

3. The explosion-proof door closer according to claim 2, characterized in that: The mounting hole includes a pressure hole, a threaded hole, and a guide hole arranged in sequence. The pressure hole is connected to the oil cavity. The explosion-proof valve includes a stud corresponding to the threaded hole and a sealing post corresponding to the guide hole.

4. The explosion-proof door closer according to claim 3, characterized in that: The pressure hole, threaded hole, and guide hole are arranged coaxially.

5. The explosion-proof door closer according to claim 3, characterized in that: The outer wall of the sealing column is provided with a sealing groove, and a sealing ring is embedded therein to seal between the sealing column and the inner wall of the guide hole.

6. The explosion-proof door closer according to claim 3, characterized in that: The outer end face of the sealing column is provided with a force-applying groove.

7. The explosion-proof door closer according to claim 3, characterized in that: A sealing gasket is provided on the inner end face of the stud.

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