Non-return fireproof valve

Abstract

The utility model discloses a check fireproof valve, and relates to the technical field of fireproof valves. The check valve comprises a valve body, a filter screen and a rotating shaft are distributed and mounted in the valve body, a valve plate is arranged on the outer surface of the rotating shaft, a gear is fixed to one end of the rotating shaft, connecting frames are arranged on the two sides of the valve body, and mounting plates are arranged on the two sides of the top of the valve body. When the fireproof valve is installed on the air pipe, a worker can insert a flange on the air pipe into the connecting frame from top to bottom and then rotate the two-way lead screw, the two-way lead screw rotates to enable the threaded block to move, then the movable rod pushes the baffle to move, and therefore the baffle is located at the top of the connecting frame; the flange on the air pipe can be limited through limiting of the baffle, the purpose of installing the fireproof valve is achieved, operation can be completed by one person, screws and tools are not needed, and operation is more convenient and faster.

Description

Technical Field

[0001] This utility model relates to the field of fire damper technology, specifically a check valve fire damper. Background Technology

[0002] Most existing buildings have a shared exhaust duct, with kitchens and bathrooms on each floor connected to it. To prevent the backflow of stale air from the shared exhaust duct, a check valve is installed between each kitchen / bathroom and the shared exhaust duct. In addition, to prevent smoke and fire from flowing back into the apartment from the shared exhaust duct in the event of a fire on another floor, national standards also require the installation of fire dampers in this location. When a fire occurs in another room, the valves automatically close to prevent the fire from spreading.

[0003] When connecting existing fire dampers to air ducts, most require multiple screws and tools for installation, which is cumbersome. For inexperienced workers, it may require two people to work together to complete the installation, resulting in low installation efficiency, time and labor costs, and a heavy burden on manual installation. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a backflow preventive fire valve to solve the technical problems mentioned above in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a check valve, comprising a valve body, wherein a filter screen and a rotating shaft are installed inside the valve body, a valve plate is provided on the outer surface of the rotating shaft, and a gear is fixed at one end of the rotating shaft, connecting frames are provided on both sides of the valve body, mounting plates are provided on both sides of the top of the valve body, a bidirectional lead screw is installed on the inner side of the mounting plate, threaded blocks are sleeved on both sides of the outer surface of the bidirectional lead screw, movable rods are fixed on both sides of the threaded blocks, and a baffle is fixed at one end of the movable rod, a sealing plate is fixed on one side of the filter screen, magnetic strips are provided on the back of the sealing plate and on the outer surface of the valve body, and an electric push rod is installed below the outer surface of the valve body through a connecting plate, and a toothed rod is fixed at one end of the electric push rod, and the toothed rod meshes with the gear.

[0006] Furthermore, limit strips are fixed at both the upper and lower interior sides of the valve body.

[0007] By adopting the above technical solution, when the valve plate flips to seal the valve body, the valve plate can be limited by the limiting strip, thus preventing the valve plate from flipping excessively and affecting the sealing performance.

[0008] Furthermore, the inner wall of the valve body is provided with an installation groove, and the filter screen slides in the installation groove.

[0009] By adopting the above technical solution, the installation and disassembly of the filter screen becomes more convenient and stable under the action of the installation groove.

[0010] Furthermore, a handle is fixed to the outer surface of the sealing plate.

[0011] By adopting the above technical solution, the handle makes it easy for staff to pull the filter screen out of the valve body.

[0012] Furthermore, a temperature sensor is installed on the inner wall of the valve body, and a controller is provided on the top of the mounting plate. Both the electric push rod and the temperature sensor are electrically connected to the controller.

[0013] By adopting the above technical solution, the temperature sensor detects the temperature inside the valve body. When the temperature reaches the threshold, the temperature sensor transmits the signal to the controller. The controller then activates the electric push rod, which pushes the rack upward, thereby causing the gear to rotate.

[0014] Furthermore, the outer surface of the bidirectional lead screw is provided with a dial wheel, and the outer surface of the dial wheel is provided with an anti-slip strip.

[0015] By adopting the above technical solution, the operator can more easily rotate the bidirectional lead screw using the dial wheel, and the anti-slip strip increases the friction of the dial wheel.

[0016] Furthermore, the inner wall of the connecting frame is provided with a sealing gasket, and the sealing gasket is made of hydrogenated nitrile rubber.

[0017] By adopting the above technical solution, the sealing gasket improves the sealing performance between the duct flange and the connecting frame, preventing air leakage. The hydrogenated nitrile rubber has excellent high-temperature resistance, which improves the service life of the sealing gasket.

[0018] Furthermore, the sealing plate is Z-shaped and fits into the limiting strip.

[0019] By adopting the above technical solution, when the sealing plate is flipped, it will fit with the limiting strip, thus improving the sealing performance.

[0020] Furthermore, the movable rod is provided in multiple sets, and the multiple sets of movable rods are slidably engaged with the mounting plate.

[0021] By adopting the above technical solution, when the threaded block moves, the movable rod can move on the mounting plate, and the movable rod becomes more stable under the action of the mounting plate.

[0022] In summary, the present invention has the following main advantages:

[0023] 1. This utility model, by providing a connecting frame, a two-way screw rod, a threaded block, a movable rod, and a baffle, allows workers to insert the flange on the air duct from top to bottom into the connecting frame when installing the fire damper on the air duct. Then, by rotating the two-way screw rod, the threaded block moves, which in turn causes the movable rod to push the baffle to move, thus positioning the baffle at the top of the connecting frame. The baffle's limiting function restricts the flange on the air duct, achieving the purpose of fire damper installation. The operation can be completed by one person without the need for screws and tools, making it more convenient and labor-saving, and greatly improving installation efficiency.

[0024] 2. This utility model, by incorporating a filter screen, a sealing plate, and a magnetic strip, can filter impurities in flue gas, preventing them from adhering to the valve's edges and affecting its sealing performance. It also prevents impurities from entering other spaces and causing environmental pollution. Furthermore, staff can periodically remove and clean the filter screen to prevent clogging from prolonged use. After cleaning, the filter screen can be reinserted into the valve body. The magnetic strip's attraction ensures the sealing plate adheres tightly to the valve body's outer surface, improving sealing performance. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the valve body structure of this utility model;

[0027] Figure 3 This is a schematic diagram of the cross-sectional structure of the valve body of this utility model;

[0028] Figure 4 This is a schematic diagram of the filter structure of this utility model;

[0029] Figure 5 This is a schematic diagram of the bidirectional lead screw structure of this utility model.

[0030] In the diagram: 1. Valve body; 2. Connecting plate; 3. Electric push rod; 4. Gear rack; 5. Rotating shaft; 6. Gear; 7. Connecting frame; 8. Mounting plate; 9. Two-way lead screw; 10. Threaded block; 11. Movable rod; 12. Baffle; 13. Dial wheel; 14. Controller; 15. Sealing plate; 16. Filter screen; 17. Limiting strip; 18. Valve plate; 19. Temperature sensor; 20. Mounting groove; 21. Magnetic strip; 22. Handle. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0032] The embodiments of this utility model will be described below based on its overall structure.

[0033] Example 1: A check valve, such as Figures 1-5 As shown, the device includes a valve body 1, inside which a filter screen 16 and a rotating shaft 5 are installed. A valve plate 18 is provided on the outer surface of the rotating shaft 5. A sealing plate 15 is Z-shaped and fits into a limiting strip 17. When the sealing plate 15 is flipped, it fits into the limiting strip 17, improving sealing. A gear 6 is fixed to one end of the rotating shaft 5. Connecting frames 7 are provided on both sides of the valve body 1. Mounting plates 8 are provided on both sides of the top of the valve body 1. A bidirectional lead screw 9 is installed on the inner side of the mounting plate 8, and the outer surfaces of the bidirectional lead screw 9 are sleeved on both sides. There is a threaded block 10, and movable rods 11 are fixed on both sides of the threaded block 10. A baffle 12 is fixed at one end of the movable rod 11. A sealing plate 15 is fixed on one side of the filter screen 16. Magnetic strips 21 are provided on the back of the sealing plate 15 and the outer surface of the valve body 1. A handle 22 is fixed on the outer surface of the sealing plate 15. Under the action of the handle 22, it is convenient for the operator to pull the filter screen 16 out of the valve body 1. An electric push rod 3 is installed on the lower part of the outer surface of the valve body 1 through a connecting plate 2. A gear 4 is fixed at one end of the electric push rod 3, and the gear 4 meshes with a gear 6.

[0034] See figure Figure 2 and Figure 3 In the above embodiment, limit strips 17 are fixed at the upper and lower interior of the valve body 1. When the valve plate 18 flips to seal the valve body 1, the limit strips 17 can limit the valve plate 18, preventing the valve plate 18 from flipping excessively and affecting the sealing performance.

[0035] See Figure 3 In the above embodiment, the inner wall of the valve body 1 is provided with an installation groove 20, and the filter screen 16 is slidably engaged with the installation groove 20. Under the action of the installation groove 20, the filter screen 16 is more convenient and stable to install and remove.

[0036] See Figure 2In the above embodiment, a temperature sensor 19 is installed on the inner wall of the valve body 1, and a controller 14 is provided on the top of the mounting plate 8. Both the electric push rod 3 and the temperature sensor 19 are electrically connected to the controller 14. The temperature sensor 19 detects the temperature inside the valve body 1. When the temperature reaches the threshold, the temperature sensor 19 transmits a signal to the controller 14. The controller 14 starts the electric push rod 3, which pushes the rack 4 upward, thereby causing the gear 6 to rotate.

[0037] See Figure 1 , Figure 2 , Figure 3 and Figure 5 In the above embodiment, the movable rod 11 is provided in multiple sets, and the multiple sets of movable rods 11 are slidably engaged with the mounting plate 8. When the threaded block 10 moves, the movable rod 11 can move on the mounting plate 8, and the movable rod 11 becomes more stable under the action of the mounting plate 8.

[0038] Example 2: To make the rotation of the bidirectional lead screw 9 more convenient, Example 2 is an improvement on Example 1. (See attached document for details.) Figure 1 , Figure 2 , Figure 3 and Figure 5 The outer surface of the bidirectional lead screw 9 is provided with a dial wheel 13, and the outer surface of the dial wheel 13 is provided with an anti-slip strip. The operator can make it easier to rotate the bidirectional lead screw 9 by using the dial wheel 13, and the anti-slip strip increases the friction of the dial wheel 13.

[0039] Example 3: To improve the sealing between the duct flange and the connecting frame 7, Example 3 is an improvement on Example 1. (See attached document for details.) Figures 1-3 The inner wall of the connecting frame 7 is provided with a sealing gasket, which is made of hydrogenated nitrile rubber. The sealing gasket improves the sealing performance between the duct flange and the connecting frame 7, preventing air leakage. The hydrogenated nitrile rubber has excellent high temperature resistance, which improves the service life of the sealing gasket.

[0040] The implementation principle of this utility model is as follows: When installing the fire damper, the worker can insert the flange on the air duct into the connecting frame 7 from top to bottom, and then rotate the double-acting screw 9. After the double-acting screw 9 rotates, the threaded block 10 moves, which in turn causes the movable rod 11 to push the baffle 12 to move, so that the baffle 12 is located at the top of the connecting frame 7. The baffle 12 can limit the flange on the air duct, thus achieving the purpose of fire damper installation. In the event of a fire, smoke is discharged into the fire damper through the air duct. Under the action of the filter screen 16, impurities in the smoke can be filtered out. The filter is used to prevent impurities from adhering to the edge of the valve and affecting the sealing performance. It also prevents impurities from being discharged into other spaces and causing environmental pollution. Temperature sensor 19 detects the temperature of valve body 1. When the temperature reaches the threshold, temperature sensor 19 transmits the signal to controller 14. Controller 14 starts electric push rod 3. Electric push rod 3 pushes rack 4 to move upward, which in turn causes gear 6 to rotate. The rotation of gear 6 causes shaft 5 to drive valve plate 18 to rotate. After valve plate 18 flips, it seals the inside of valve body 1, thus closing the valve.

[0041] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A check valve, comprising a valve body (1), characterized in that: The valve body (1) is internally equipped with a filter screen (16) and a rotating shaft (5). The outer surface of the rotating shaft (5) is provided with a valve plate (18), and a gear (6) is fixed at one end of the rotating shaft (5). The valve body (1) is provided with connecting frames (7) on both sides. The top two sides of the valve body (1) are provided with mounting plates (8). The inner side of the mounting plate (8) is provided with a two-way screw (9). The outer surface of the two-way screw (9) is sleeved with threaded blocks on both sides. The two sides of the threaded blocks (10) are fixed with movable rods (11), and a baffle (12) is fixed at one end of the movable rod (11). A sealing plate (15) is fixed on one side of the filter screen (16). Magnetic strips (21) are provided on the back of the sealing plate (15) and the outer surface of the valve body (1). An electric push rod (3) is installed below the outer surface of the valve body (1) through a connecting plate (2), and a toothed rod (4) is fixed at one end of the electric push rod (3), and the toothed rod (4) meshes with the gear (6).

2. The check valve according to claim 1, characterized in that: Limiting strips (17) are fixed on both the upper and lower interior sides of the valve body (1).

3. The check valve according to claim 1, characterized in that: The valve body (1) has an installation groove (20) on its inner wall, and the filter screen (16) slides in the installation groove (20).

4. The check valve according to claim 1, characterized in that: A handle (22) is fixed to the outer surface of the sealing plate (15).

5. The check valve according to claim 1, characterized in that: A temperature sensor (19) is installed on the inner wall of the valve body (1), and a controller (14) is provided on the top of the mounting plate (8). The electric push rod (3) and the temperature sensor (19) are both electrically connected to the controller (14).

6. The check valve according to claim 1, characterized in that: The outer surface of the bidirectional lead screw (9) is provided with a dial wheel (13), and the outer surface of the dial wheel (13) is provided with an anti-slip strip.

7. The check valve according to claim 1, characterized in that: The inner wall of the connecting frame (7) is provided with a sealing gasket, and the sealing gasket is made of hydrogenated nitrile rubber.

8. The check valve according to claim 2, characterized in that: The sealing plate (15) is Z-shaped and fits into the limiting strip (17).

9. The check valve according to claim 1, characterized in that: The movable rod (11) is provided in multiple sets, and the multiple sets of movable rods (11) are slidably engaged with the mounting plate (8).

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