Mechanical pressure relief opening with adjustable opening pressure

Abstract

The utility model discloses a mechanical pressure relief opening with adjustable opening pressure, which comprises a frame body assembly, a plurality of blade shafts which are arranged in parallel are rotatably connected onto the frame body assembly, follow-up blades are arranged on the blade shafts, at least one end of each blade shaft is provided with a first connecting rod which extends along the radial direction, and the first connecting rod is provided with a second connecting rod which extends along the radial direction. All the first connecting rods are further rotationally connected to second connecting rods, each second connecting rod is provided with a blade reset device in a matched mode, and the blade reset devices are arranged on the frame body assembly. The mechanical pressure relief opening is provided with a blade reset device, and the blade reset device can flexibly adjust the opening pressure of the blade through the elastic force of a spring. When the pressure value of the protection area reaches the set pressure value of the blade reset device, the blade is opened; when the pressure value of the protection area is lower than the set pressure value of the blade reset device, the blade automatically resets and closes, the overall function is complete, and practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of fire-fighting facilities, and more specifically, it relates to a mechanical pressure relief opening with adjustable opening pressure. Background Art

[0002] The pressure relief opening, also known as an automatic pressure relief device, is an important auxiliary device for gas fire extinguishing equipment, which can prevent the pressure in the protected area from rising and damaging the maintenance structure of the protected area. When the gas fire extinguishing system is activated, a large amount of fire extinguishing gas is sprayed into the protected area, causing the air pressure in the protected area to rise instantaneously; in addition, the heat generated by the fire combustion will also cause the indoor air pressure to rise. Excessive pressure may damage the maintenance structure of the protected area, resulting in the failure of fire extinguishing and the spread of fire. The pressure relief opening is usually in a closed state and automatically opens to release pressure after the gas fire extinguishing system is activated and the pressure in the protected area rises to the set value.

[0003] At present, the opening forms of domestic mechanical pressure relief openings are mainly divided into two types. One is by the weight of the blade, and the other is by relying on the magnetic force of a strong magnet to close the blade of the pressure relief opening. It has the following disadvantages:

[0004] The working principle of the blade self-weight or counterweight method: The traditional pressure relief opening design usually relies on the self-weight of the blade or additional counterweights to achieve automatic closing. When the pressure in the protected area rises to a certain threshold, the blade is pushed open; after the pressure drops, the blade returns to its original position and closes by relying on its own weight or counterweight. Disadvantages: This design cannot accurately control the opening force of the blade. When a subway passes by or there is wind outdoors, the airflow is likely to cause the blade to swing, affecting stability and reliability.

[0005] The working principle of the magnetic attraction method: To improve the problem of the blade swaying with the wind, some pressure relief openings adopt a magnetic attraction design. The blade is kept in the closed state by magnetic attraction force. When the pressure rises, the magnetic attraction force is overcome and the blade opens. Disadvantages: Although the problem of the blade swaying with the wind is solved, the magnetic attraction design still cannot accurately control the opening force of the blade. In addition, the persistence and stability of the magnetic attraction force may also be affected by environmental factors such as temperature and humidity.

[0006] The disadvantages of the existing pressure relief opening technical solutions are summarized as follows:

[0007] 1. The opening force cannot be accurately controlled: Whether it is the blade self-weight, counterweight or magnetic attraction method, the existing technology cannot achieve accurate control of the blade opening force. This results in the performance of the pressure relief opening may be unstable under different environmental conditions.

[0008] 2. Prone to external interference: When a subway passes by, there is wind outdoors, etc., the airflow is likely to interfere with the blade, affecting the normal operation of the pressure relief opening. Especially in an environment with large vibrations such as a subway, this interference may be more obvious.

[0009] 3. Reliability and stability issues: Due to the inability to precisely control the opening force and susceptibility to external interference, there are certain problems with the reliability and stability of existing pressure relief openings. This may result in ineffective operation at critical moments, thus affecting the performance of the entire gas fire extinguishing system. Summary of the Invention

[0010] The purpose of the present utility model is to overcome the deficiencies in the above-mentioned prior art and provide a mechanical pressure relief opening with adjustable opening pressure, which is equipped with a blade reset device. The blade reset device can flexibly adjust the blade opening pressure relying on the spring force. When the pressure value in the protected area reaches the set pressure value of the blade reset device, the blade opens; when the pressure value in the protected area is lower than the set pressure value of the blade reset device, the blade automatically resets and closes.

[0011] To solve the above technical problems, the purpose of the present utility model is achieved as follows: A mechanical pressure relief opening with adjustable opening pressure according to the present utility model includes a frame assembly. A plurality of blade shafts arranged parallel to each other are rotatably connected to the frame assembly. Blades that follow are provided on the blade shafts. At least one end of each blade shaft is provided with a first connecting rod extending radially. All the first connecting rods are also rotatably connected to a second connecting rod. Each second connecting rod is provided with a matching blade reset device, and the blade reset device is arranged on the frame assembly.

[0012] The present utility model is further provided as: The blade reset device includes a blade reset guide rail extending in the depth direction of the frame assembly. One end of the blade reset guide rail is provided with a fixed stop block, and the other end is provided with a movable stop block. A blade reset slider is slidably connected to the blade reset guide rail. A third connecting rod with one end hinged to the blade reset slider and the other end hinged to the second connecting rod is provided between the blade reset slider and the second connecting rod. A blade reset spring with one end abutting against the blade reset slider and the other end abutting against the movable stop block is sleeved on the blade reset guide rail.

[0013] The present utility model is further provided as: The movable stop block can move in a direction close to or away from the fixed stop block.

[0014] The present utility model is further provided as: A stud portion is provided on the blade reset guide rail, and the movable stop block is threadedly connected to the stud portion.

[0015] The present utility model is further provided as: A louver is provided at the front end of the frame assembly, and a screw rod is connected between the louver and the frame assembly.

[0016] In summary, the present utility model has the following beneficial effects:

[0017] 1. Precise control of the opening force: By adjusting the magnitude of the spring force, the present invention can precisely control the opening force of the blade, avoiding the problem in the prior art that the opening force of the blade cannot be precisely controlled. This precise control enables the pressure relief port to work stably and reliably under different environmental conditions, improving the overall performance of the system.

[0018] 2. Simple structure and low cost: The structure of the present invention is relatively simple and does not require complex mechanical structures or electronic control systems, thereby reducing the manufacturing cost. At the same time, the simple structure also means higher reliability and fewer failure points, reducing the later maintenance burden.

[0019] 3. Reliable operation: Due to the adoption of the spring force adjustment mechanism, the pressure relief port of the present invention is not easily affected by external disturbances such as air flow and vibration during operation and can stably and reliably perform the opening and closing actions. This reliability is crucial for ensuring the normal operation of the gas fire extinguishing system.

[0020] 4. Quick response speed: When the pressure in the protected area suddenly rises, the present invention can quickly respond and open the blade for pressure relief, effectively preventing the pressure in the protected area from exceeding the allowable pressure. This quick response speed helps to reduce potential losses and hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the overall structural schematic diagram of the present utility model;

[0022] Figure 2 is the side view structural schematic diagram of the present utility model;

[0023] Figure 3 is the partial structural schematic diagram of the present utility model;

[0024] Figure 4 is the structural schematic diagram of the present utility model for embodying the blade reset device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the preferred implementation solutions of the present utility model will be described below in conjunction with specific embodiments. However, it should be understood that these descriptions are only for further explaining the features and advantages of the present utility model and not for limiting the patent requirements of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0026] The present utility model will be further described below in conjunction with the drawings and preferred embodiments.

[0027] Embodiment 1

[0028] SeeFigures 1 to 4 As shown in the figure, a mechanical pressure relief port with adjustable opening pressure involved in this embodiment includes a frame assembly 1. A plurality of blade shafts (not marked) arranged in parallel are rotatably connected to the frame assembly 1. Blades 2 that move in a follow-up manner are provided on the blade shafts. One end of each blade shaft is provided with a first connecting rod 3 extending radially. All the first connecting rods 3 are also rotatably connected to a second connecting rod 4. Each second connecting rod 4 is provided with a blade reset device 5, and the blade reset device 5 is arranged on the frame assembly 1.

[0029] Further, the blade reset device 5 includes a blade reset guide rail 51 extending in the depth direction of the frame assembly. One end of the blade reset guide rail 51 is provided with a fixed stop block 52, and the other end is provided with a movable stop block 53. A blade reset slider 54 is slidably connected to the blade reset guide rail 51. A third connecting rod 55 with one end hinged to the blade reset slider and the other end hinged to the second connecting rod is provided between the blade reset slider 54 and the second connecting rod 4. A blade reset spring 56 with one end abutted against the blade reset slider and the other end abutted against the movable stop block is sleeved on the blade reset guide rail 51.

[0030] Further, the movable stop block 53 can move in a direction close to or away from the fixed stop block 52; a stud portion 511 is provided on the blade reset guide rail 51, and the movable stop block 53 is threadedly connected to the stud portion 511.

[0031] In this embodiment, the starting mode of the mechanical pressure relief port is as follows: when the air pressure in the protection area increases to the set pressure value of the blade reset device 5, the blade 2 rotates and opens. The blade 2 drives the first connecting rod 3 to rotate. The first connecting rod 3 is rotatably connected to the second connecting rod 4, and the second connecting rod 4 is rotatably connected to the third connecting rod 55, thereby driving the blade reset slider 54 to slide. The blade reset spring 56 is pushed by the blade reset slider 54 to be compressed and store energy; when the air pressure in the protection area decreases and is lower than the set pressure value of the blade reset device 5, the blade reset spring 56 pushes the blade reset slider 54 to reset, driving the link mechanism to automatically close the blade 2.

[0032] Among them, by rotating and adjusting the movable stop block 53, the distance between it and the fixed stop block 52 can be changed, thereby adjusting the magnitude of the spring force to control the opening and closing actions of the blade and the magnitude of the acting force, achieving precise control of the opening force.

[0033] Embodiment 2

[0034] See Figures 1 to 4 As shown in the figure, a mechanical pressure relief port with adjustable opening pressure involved in this embodiment is further provided, on the basis of Embodiment 1, that a shutter 6 is provided at the front end of the frame assembly 1, and a screw rod 7 is connected between the shutter 6 and the frame assembly 1.

[0035] When installing this device, a square hole with the outer dimension of the device frame and a suitable margin should be pre-cut on the wall, and then the device is placed into the square hole and firmly installed using expansion bolts through the mounting holes on the frame assembly.

[0036] Unless otherwise specified, in this utility model, if there are terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicating the orientation or positional relationship, they are based on the actual orientation or positional relationship shown, and are only for the convenience of describing this utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the orientation or positional relationship in this utility model are only used for exemplary illustration and should not be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood in combination with the embodiments and according to the specific circumstances.

[0037] Unless otherwise clearly defined and limited, in this utility model, if there are terms such as "set", "connected" and "connected", they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0038] The preferred specific embodiments of this utility model have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of this utility model without creative work. Therefore, all technical solutions that can be obtained by those skilled in the art in this technical field based on the concept of this utility model through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A mechanical pressure relief port with adjustable opening pressure, comprising a frame assembly, on which a plurality of blade shafts arranged in parallel are rotatably connected, and blades acting as followers are provided on the blade shafts, characterized in that: At least one end of each of the blade shafts is provided with a first connecting rod extending radially, and all the first connecting rods are also rotatably connected to a second connecting rod. Each of the second connecting rods is provided with a blade reset device, and the blade reset device is arranged on the frame assembly.

2. The mechanically pressure-relieving port with adjustable opening pressure according to claim 1, wherein: The blade reset device includes a blade reset guide rail extending in the depth direction of the frame assembly. One end of the blade reset guide rail is provided with a fixed stop, and the other end is provided with a movable stop. A blade reset slider is slidably connected to the blade reset guide rail. A third connecting rod with one end hinged to the blade reset slider and the other end hinged to the second connecting rod is arranged between the blade reset slider and the second connecting rod. A blade reset spring with one end abutting against the blade reset slider and the other end abutting against the movable stop is sleeved on the blade reset guide rail.

3. The mechanically pressure-relieving opening with adjustable opening pressure according to claim 2, wherein: The movable stop can move in a direction close to or away from the fixed stop.

4. The mechanically pressure-relieving port with adjustable opening pressure according to claim 3, characterized in that: A stud portion is arranged on the blade reset guide rail, and the movable stop is threadedly connected to the stud portion.

5. The mechanically pressure-relieving opening with adjustable opening pressure according to any one of claims 1-4, characterized in that: A shutter is arranged at the front end of the frame assembly, and a screw rod is connected between the shutter and the frame assembly.

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