Double-clap linkage type smoke exhaust fire-preventing check valve

Abstract

The utility model discloses a double -poppet linkage formula smoke exhaust fire -prevention check valve relates to smoke exhaust fire -prevention check valve technical field, including the valve body and the fixed setting in the center column of valve body, and the both sides symmetrical of center column are provided with the valve piece, the valve piece rotation is installed in the valve body, the middle position rotation of center column is installed with the locating shaft, and one end fixed setting of locating shaft has the lock bar, the trigger torsional spring is equipped on the locating shaft, and the both ends of trigger torsional spring are connected with lock bar and the inner wall of center column respectively. The utility model discloses through setting pre -compression's trigger spring, can release the elasticity of trigger spring after locating shaft rotation ninety, makes the guide rod can be inserted into the plug hole and lock the locating shaft dead, to utilize double -poppet linkage formula smoke exhaust fire -prevention check valve to guarantee the locking nature with double locking structure, avoids its when again appearing rotation when the excessive pressure or the explosion of fire disaster production external force influence, to the valve piece appears the situation of closing not strictly or being pushed open.

Description

Technical Field

[0001] This utility model relates to the technical field of smoke exhaust, fire prevention, and backflow prevention valves, specifically a double-lobe linkage type smoke exhaust, fire prevention, and backflow prevention valve. Background Technology

[0002] A smoke exhaust fireproof check valve is a common type of valve used for connecting flues, primarily in kitchens where the exhaust duct connects to the range hood's vent. Most modern smoke exhaust fireproof check valves are double-disc type. The valve plate's rebound is achieved through a torsion spring mounted on the side of the valve plate. The spring's trigger end extends into a ring that abuts against the valve plate, applying elastic force to close it. The fireproof function utilizes a fusible link or thermal element in the valve body to trigger a fireproof locking mechanism, forcibly closing the valve and creating physical isolation. However, because the force is applied to the inner side of the valve plate, i.e., the rotating side, the limiting position is singular, resulting in limited locking effectiveness. As the valve body is used for a longer period of time, the surfaces of the valve plate and the valve body will become contaminated with oil. The spring in the locking mechanism may weaken due to thermal expansion and contraction caused by daily use and the increase in accumulation time. If the fireproof locking mechanism is triggered, the oil and insufficient elasticity at the closing point between the valve plate edge and the inner wall of the valve body may cause incomplete closure. It may also be pushed open by greater pressure, resulting in gaps. This will affect the sealing effect, thereby reducing the fireproof effect, causing high-temperature smoke to leak, and even causing the flame to spread. Utility Model Content

[0003] (a) Technical problems to be solved In view of the above-mentioned shortcomings of the existing technology, the present invention provides a double-lobe linkage smoke exhaust fire prevention check valve, which can effectively solve the problems of the existing technology.

[0004] (II) Technical Solution To achieve the above objectives, this utility model employs the following technical solution: This utility model discloses a double-lobe linkage smoke exhaust fireproof check valve, including a valve body and a central column fixedly installed in the valve body. Valve plates are symmetrically arranged on both sides of the central column. The valve plates are rotatably installed in the valve body. A positioning shaft is rotatably installed in the middle of the central column. A locking rod is fixedly installed at one end of the positioning shaft. A trigger torsion spring is sleeved on the positioning shaft. The two ends of the trigger torsion spring are respectively connected to the locking rod and the inner wall of the central column. A limit rod is fixedly installed at the other end of the positioning shaft. A fuse is installed on the surface of the central column and sleeved on the limit rod. A movable groove is opened in the central column, and a guide rod is vertically arranged in the movable groove. A movable groove is provided on the upper side of the guide rod. An insertion hole adapted to the guide rod is opened on the positioning shaft. Grooves are symmetrically opened on the inner walls of the left and right sides of the valve body. Limit locking blocks are rotatably installed in the grooves. A connecting cable is connected between the limit locking blocks and the guide rod.

[0005] Furthermore, the positioning shaft and the locking rod are arranged in a T-shape, with both ends of the locking rod being hemispherical, and the locking rod and the valve plate are arranged in parallel.

[0006] Furthermore, the guide rod has a circular cross-section, a hemispherical lower end, and the lower end of the guide rod abuts against the surface of the positioning shaft. The opening edge of the insertion hole is rounded, and the guide rod and the positioning shaft are arranged perpendicularly.

[0007] Furthermore, the valve body and the central column are provided with a communicating rope groove, and the connecting cable passes through the rope groove. The upper end of the guide rod is fixedly connected to one end of the two sets of connecting cables, and the other end of the connecting cable is fixedly connected to the lower surface of the limiting lock block.

[0008] Furthermore, a first guide wheel and a second guide wheel are rotatably installed at the two right-angle turns of the rope groove, and the first guide wheel and the second guide wheel are arranged horizontally and vertically, respectively. The connecting cable is attached to the first guide wheel and the second guide wheel to make turns.

[0009] Furthermore, a baffle with an outer diameter that matches the inner diameter of the groove opening is provided at the opening of the groove, and the upper end of the baffle is fixedly connected to the inner wall of the central column.

[0010] Furthermore, the limiting lock block is wedge-shaped, the diameter of the lower end of the limiting lock block decreases from top to bottom, and the lower end corner of the limiting lock block is rounded.

[0011] (III) Beneficial Effects Compared with the known prior art, the technical solution provided by this utility model has the following beneficial effects: This invention utilizes a pre-compressed trigger spring. After the positioning shaft rotates 90 degrees, the spring's elasticity is released, allowing the guide rod to quickly insert into the socket and lock the positioning shaft. This double-locking structure ensures locking stability and prevents rotation under excessive pressure from a fire or explosion, which could lead to incomplete valve closure or the valve being forced open. Simultaneously, as the guide rod moves downwards, it pulls two sets of limit locking blocks through two connecting cables, allowing these blocks to press and limit the edges of the valve plates. This ensures the valve plates fit tightly against the inner wall of the valve body, preventing warping due to high pressure or explosive impacts. This further enhances the valve's sealing effect, preventing smoke leakage and flame spillage, thus improving the valve's fire and explosion resistance. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a front view schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram showing the open state of the limiting lock block in this utility model; Figure 3 This is a schematic diagram of the structure of the limiting lock block in the open state in this utility model; Figure 4 This is a rear sectional view of the structure of this utility model; Figure 5 This is a partial cross-sectional view of the present invention; Figure 6 This is a schematic diagram of the structural connection at the connecting cable in this utility model; Figure 7 This is a schematic cross-sectional view of the groove in this utility model; Figure 8 This is a schematic diagram of the open state of the limiting lock block in this utility model.

[0014] The labels in the diagram represent: 1. Valve body; 2. Center column; 3. Valve plate; 4. Positioning shaft; 5. Locking rod; 6. Trigger torsion spring; 7. Limiting rod; 8. Fuse; 9. Movable groove; 10. Guide rod; 11. Trigger spring; 12. Socket; 13. Connecting cable; 14. Rope groove; 15. First guide wheel; 16. Second guide wheel; 17. Groove; 18. Limiting locking block; 19. Baffle plate. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0016] Please see Figure 1-8This utility model provides an embodiment of a double-lobe linkage smoke exhaust fireproof check valve, comprising a valve body 1 and a central column 2 fixedly disposed within the valve body 1. Valve plates 3 are symmetrically arranged on both sides of the central column 2, and the valve plates 3 are rotatably mounted within the valve body 1. A positioning shaft 4 is rotatably mounted at the middle position of the central column 2, and a locking rod 5 is fixedly disposed at one end of the positioning shaft 4. A trigger torsion spring 6 is sleeved on the positioning shaft 4, and both ends of the trigger torsion spring 6 are respectively connected to the locking rod 5 and the inner wall of the central column 2. The other end of the positioning shaft 4... A limit rod 7 is fixedly installed. A fuse 8 is installed on the surface of the center column 2 and is sleeved on the limit rod 7. A movable groove 9 is opened in the center column 2, and a guide rod 10 is vertically arranged in the movable groove 9. A movable groove 9 is provided on the upper side of the guide rod 10. An insertion hole 12 adapted to the guide rod 10 is opened on the positioning shaft 4. Grooves 17 are symmetrically opened on the inner walls of the left and right sides of the valve body 1, and a limit locking block 18 is rotatably installed in the groove 17. A connecting cable 13 is connected between the limit locking block 18 and the guide rod 10.

[0017] The valve plate 3 is closed by the extension of a torsion spring, which presses against the valve plate 3. The spring applies a thrust to close the valve. This is a mature existing technology, and its specific construction will not be described in detail here. The fuse 8 is a fusible element found in existing fireproof locking components. In existing technologies, it is mostly made of galvanized steel, with a melting point generally between 180°C and 280°C, depending on the application. Meanwhile, the melting point of the connecting cable 13 needs to be much higher than that of the fuse 8; it can be made of high-temperature resistant alloy materials such as steel wire rope.

[0018] As a preferred embodiment of this example, Figure 1 , Figure 2 and Figure 5 As shown, the positioning shaft 4 and the locking rod 5 are arranged in a T-shape, with both ends of the locking rod 5 being hemispherical. The locking rod 5 and the valve plate 3 are arranged parallel to each other. This hemispherical structure prevents excessive scraping and friction from the sharp edges when the locking rod 5 rotates and contacts the outer wall of the valve plate 3, ensuring smooth rotation by reducing friction. The T-shaped construction provides sufficient strength, and the two ends can effectively contact the two sets of valve plates 3 to close upon triggering.

[0019] As a preferred embodiment of this example, Figure 5As shown, the guide rod 10 has a circular cross-section, and its lower end is hemispherical. The lower end of the guide rod 10 abuts against the surface of the positioning shaft 4. The opening edge of the insertion hole 12 is rounded. The guide rod 10 and the positioning shaft 4 are perpendicular to each other. This structure allows the guide rod 10 to be aligned with the insertion hole 12 after the positioning shaft 4 is rotated 90 degrees. Due to the hemispherical design of the lower end of the guide rod 10 and the rounded opening of the insertion hole 12, the guide rod 10 can be better aligned with the insertion hole 12 for insertion, thus achieving a good guiding effect. Furthermore, because there are no obvious sharp edges, the hard friction is relatively small.

[0020] As a preferred embodiment of this example, Figure 4 , Figure 5 and Figure 6 As shown, the valve body 1 and the central column 2 have interconnected rope grooves 14, and the connecting cable 13 passes through the rope grooves 14. The upper end of the guide rod 10 is fixedly connected to one end of the two sets of connecting cables 13, and the other end of the connecting cable 13 is fixedly connected to the lower surface of the limiting locking block 18. This structure allows the two sets of limiting locking blocks 18 to rotate and open in opposite directions when the guide rod 10 is triggered to move downwards via the connecting cable 13, thereby pressing and fixing the edge of the valve plate 3, improving the sealing effect, and preventing it from being pushed open due to excessive pressure or explosion.

[0021] As a preferred embodiment of this example, Figure 4 and Figure 6 As shown, a first guide wheel 15 and a second guide wheel 16 are rotatably mounted at the two right-angle bends of the rope groove 14, respectively. The first guide wheel 15 and the second guide wheel 16 are arranged horizontally and vertically, respectively. The connecting cable 13 is aligned with the first guide wheel 15 and the second guide wheel 16 to make turns. This structure is used to receive and guide the connecting cable 13 at the bends within the rope groove 14 through the first guide wheel 15 and the second guide wheel 16, thereby reducing friction when the connecting cable 13 moves and ensuring smooth pulling of the connecting cable 13.

[0022] As a preferred embodiment of this example, Figure 4 , Figure 6 , Figure 7 and Figure 8 As shown, a baffle 19 with an outer diameter matching the inner diameter of the opening of the groove 17 is provided at the opening of the groove 17, and the upper end of the baffle 19 is fixedly connected to the inner wall of the central post 2. This structure is used to block the opening of the groove 17 by the baffle 19 to prevent external oil from directly entering the groove 17 and causing oil accumulation, which would hinder the limit lock block 18 from being triggered. The material of the baffle 19 needs to be resistant to short-term high temperatures. High-temperature resistant silicone material can be used, which is flexible and fits well, or high-temperature resistant metal sheet can be used, which has a poorer fit but is durable.

[0023] As a preferred embodiment of this example, Figure 4 , Figure 6 and Figure 8 As shown, the limiting locking block 18 is wedge-shaped, with its lower end diameter decreasing from top to bottom, and its lower end corners rounded. This structure results in a larger gap between the limiting locking block 18 and the closed valve plate 3 edge when initially unfolded. As the limiting locking block 18 continues to unfold, the gap will become smaller and smaller. If the edge of the valve plate 3 is raised and not fully closed, the limiting locking block 18 will continuously press the edge of the valve plate 3 tightly during the unfolding process until it is completely closed.

[0024] Working principle: When the fuse 8 melts due to sufficient high temperature, the limit rod 7 is no longer restricted, and the accumulated trigger torsion spring 6 releases its elastic force, driving the positioning shaft 4 and locking rod 5 to rotate. When the locking rod 5 rotates, it abuts against the inner side of the two sets of valve plates 3, causing them to rotate and close. After the positioning shaft 4 rotates to ninety degrees, the locking rod 5 has also turned to the horizontal direction, and the valve plates 3 are closed. Then, the trigger spring 11, which is in a state of accumulation, pushes the guide rod 10 downward through its elastic force, causing the guide rod 10 to move downward and insert into the socket 12. At this time, due to the restriction of the guide rod 10, the positioning shaft 4 cannot be rotated by external force, thereby locking the position of the locking rod 5. At the same time, when the guide rod 10 moves downward, it will pull the connecting cable 13, causing the other end of the connecting cable 13 to pull the two sets of limit locking blocks 18 to unfold from the groove 17, and the baffle 19 will be naturally lifted. When the limit locking block 18 rotates and unfolds, it will press against the outer edge of the valve plate 3, thereby reducing the possibility of its outer edge lifting and strengthening the closing effect, reducing smoke leakage, and reducing the possibility of lifting due to high pressure or explosion.

[0025] 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 will 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.

[0026] In the description of this application, it should be understood that the terms "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A double-lobe linkage type smoke exhaust fireproof check valve, characterized in that: The device includes a valve body (1) and a central column (2) fixedly installed inside the valve body (1). Valve plates (3) are symmetrically arranged on both sides of the central column (2). The valve plates (3) are rotatably installed inside the valve body (1). A positioning shaft (4) is rotatably installed at the middle position of the central column (2). A locking rod (5) is fixedly installed at one end of the positioning shaft (4). A trigger torsion spring (6) is sleeved on the positioning shaft (4), and both ends of the trigger torsion spring (6) are connected to the locking rod (5) and the inner wall of the central column (2), respectively. A limit rod (7) is fixedly installed at the other end of the positioning shaft (4). The central column (2)... A fuse (8) is installed on the surface of the valve body (1), and the fuse (8) is sleeved on the limiting rod (7). A movable groove (9) is opened in the center column (2), and a guide rod (10) is vertically arranged in the movable groove (9). A movable groove (9) is provided on the upper side of the guide rod (10). An insertion hole (12) adapted to the guide rod (10) is opened on the positioning shaft (4). Grooves (17) are symmetrically opened on the inner walls of the left and right sides of the valve body (1), and a limiting lock block (18) is rotatably installed in the groove (17). A connecting cable (13) is connected between the limiting lock block (18) and the guide rod (10).

2. The double-lobe linkage smoke exhaust fireproof check valve according to claim 1, characterized in that: The positioning shaft (4) and the locking rod (5) are arranged in a T-shape. Both ends of the locking rod (5) are set as hemispherical. The locking rod (5) and the valve plate (3) are arranged in parallel.

3. The double-lobe linkage smoke exhaust fireproof check valve according to claim 1, characterized in that: The cross-section of the guide rod (10) is circular, the lower end of the guide rod (10) is hemispherical, and the lower end of the guide rod (10) abuts against the surface of the positioning shaft (4). The opening edge of the insertion hole (12) is rounded. The guide rod (10) and the positioning shaft (4) are arranged perpendicularly.

4. The double-lobe linkage smoke exhaust fireproof check valve according to claim 1, characterized in that: The valve body (1) and the central column (2) are provided with a connected rope groove (14), and the connecting cable (13) is passed through the rope groove (14). The upper end of the guide rod (10) is fixedly connected to one end of the two sets of connecting cables (13), and the other end of the connecting cable (13) is fixedly connected to the lower surface of the limiting lock block (18).

5. A double-lobe linkage smoke exhaust fireproof check valve according to claim 4, characterized in that: The first guide wheel (15) and the second guide wheel (16) are rotatably installed at the two right-angle turns of the rope groove (14), and the first guide wheel (15) and the second guide wheel (16) are arranged horizontally and vertically respectively. The connecting cable (13) is attached to the first guide wheel (15) and the second guide wheel (16) to make turns.

6. A double-lobe linkage smoke exhaust fireproof check valve according to claim 1, characterized in that: The opening of the groove (17) is provided with a baffle (19) whose outer diameter is adapted to the inner diameter of the opening of the groove (17), and the upper end of the baffle (19) is fixedly connected to the inner wall of the central column (2).

7. A double-lobe linkage smoke exhaust fireproof check valve according to claim 1, characterized in that: The limiting lock block (18) is wedge-shaped, the diameter of the lower end of the limiting lock block (18) decreases from top to bottom, and the lower end of the limiting lock block (18) is rounded.

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