Fire check valve

Abstract

The present invention discloses a fireproof check valve, comprising a valve body, a double-door valve disc installed inside the valve body, a vertical beam located at the symmetric axis of the valve disc, and a self-locking device installed inside the valve body, wherein the self-locking device comprises a positioning shaft, a locking block, a spring, a fusible piece, and a vertical shaft for connecting the locking block. In the event of a fire, the fusible piece melts, the locking block opens, and rests vertically against the valve disc under the action of the spring. The present invention can quickly lock the valve disc after a fire to prevent the backflow of high-temperature smoke after a fire. It has the advantages of simple structure, not easy failure of the valve disc after locking, and high strength.

Description

Technical Field

[0001] The invention relates to a fire-proof check valve. Background Art

[0002] A check valve is a valve with a disc as its opening and closing element, which operates by its own weight or other mechanism to prevent the backflow of media. Check valves are commonly installed in ventilation ducts in public places or in range hood exhaust ducts to prevent the spread of high-temperature smoke in the event of a fire. Double-disc fire check valves offer the advantages of small disc footprint and high airflow, making them commonly used in public ventilation ducts and range hoods. The most critical feature of a double-disc fire check valve is the self-locking mechanism, which locks the check valve disc according to the duct airflow temperature. Many check valve self-locking mechanisms use spring thrust to lock the disc, but under high temperatures and high airflow conditions, the spring can fail, causing the disc to open and further spread the fire. Furthermore, most fire check valve self-locking mechanisms are weak, resulting in a prolonged opening period for the disc, low force, and poor stability. Summary of the Invention

[0003] Purpose of the invention: The present invention aims to provide a fire-proof check valve with a self-locking device that has a fast locking speed and high structural strength to solve the above problems.

[0004] Technical solution: A fireproof check valve of the present invention includes a valve body, a double-door valve disc installed inside the valve body, a vertical beam located at the symmetry axis of the valve disc, and a self-locking device installed inside the valve body, wherein the self-locking device includes a positioning shaft, a locking block, a spring, a fuse, and a vertical shaft for connecting the locking block.

[0005] The two ends of the positioning shaft are connected to the valve body and are parallel to the vertical beam. It can be set in the middle of the valve body or at the uppermost end of the valve body.

[0006] The locking block is arranged perpendicular to the positioning axis and includes at least two blocking pieces that are symmetrically arranged about the positioning axis.

[0007] One end of the spring is connected to each barrier, and the other end is connected to a positioning shaft or valve body in a direction opposite to the barrier. Preferably, when the spring is connected to the valve body, the connection point on the valve body is on the center axis of the valve body.

[0008] The fuse piece connects the various blocking pieces, so that the locking blocking piece is in a closed state and the spring is in a stretched state.

[0009] A torsion spring is provided on the vertical shaft for assisting the locking block to open.

[0010] Each blocking piece of the locking blocking member is in a solid sheet shape or a frame shape.

[0011] When the valve disc is tilted at a certain angle to the horizontal, the bottom edge of the blocking disc is a beveled edge with an angle greater than the tilt angle of the valve disc, and the bottom edge may be stepped. The blocking disc ensures that after the fusible link melts, the valve disc can move to the end of the spring contraction, abutting and locking the valve disc to prevent it from opening.

[0012] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0013] (1) The locking element of the present invention is evenly stressed under the action of the spring, has high consistency of action, stable operation, and large spring tension, which can instantly lock the valve disc. The device after locking is highly safe and has good sealing. The valve disc is difficult to open, has high strength when in use, and is not prone to failure.

[0014] (2) In the normal ventilation process, the self-locking device of the present invention does not block the opening and closing of the valve plate, and the ventilation volume is large. In addition, the structure is simple, the number of related parts is small, and it is easy to produce and assemble, and the production cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of the present invention in a closed state;

[0016] Figure 2 Schematic diagram of the structure of the self-locking device of the present invention;

[0017] Figure 3 It is a structural schematic diagram of the locking state of the present invention. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0019] like Figure 1 As shown, the fireproof check valve of the present invention includes a valve body 1, a double-door valve plate 2 installed inside the valve body, a vertical beam 3 located at the symmetry axis of the valve plate, and a self-locking device installed inside the valve body, wherein the self-locking device includes a positioning shaft 4, a locking block 5, a spring 6, a fuse 8 and a vertical shaft 7 for connecting the locking block.

[0020] The positioning shaft 4 is arranged at the center axis of the valve body, parallel to the vertical beam 3, and can be arranged in the middle of the valve body or at the uppermost end of the valve body 1. The vertical shaft 7 is connected to the positioning shaft 4 at one end and to the vertical beam 3 at the other end, and is located in the center of the valve body 1. The locking block 3 is arranged perpendicular to the positioning shaft 4, and includes at least two blocks symmetrically arranged about the positioning axis. One end of each block of the locking block 5 is connected to the vertical shaft 7, so that the locking block can rotate around the vertical shaft. One end of each block of the locking block 5 is fixed by a fuse 8, so that the block is in a closed state, and the spring 6 is in a stretched state. The width of each block after closing does not exceed the width of the vertical beam 3, thereby ensuring that each valve plate 2 of the check valve can be fully opened when the check valve is in the working state.

[0021] One end of the spring 6 is directly or indirectly connected to each barrier, and the other end is connected to the positioning shaft or valve body in the opposite direction of the barrier. Figure 2 As shown. When one end of the spring 6 is directly connected to the ends of the respective barrier plates of the locking block 5, the number of springs corresponds to the number of barrier plates, one end of the spring is directly connected to the opening 13 at the end of the barrier plate, and the other end is connected to the positioning shaft 4 or the valve body 1 in the opposite direction of the barrier plate. When the spring is connected to the valve body 1, the connection point on the valve body is on the center axis of the valve body. A hook 11 for connecting the spring 6 is provided on the valve body 1 or the positioning shaft. When one end of the spring 6 is indirectly connected to the ends of the respective barrier plates of the locking block 5, the spring 6 is provided on the positioning shaft 4 and is parallel to the positioning shaft 4. The spring is provided with a connecting rod, and the end of the spring is connected to the barrier plate through the connecting rod. The left and right side plates of the positioning shaft 4 protrude upward to form side walls of a certain height, which enable the spring 6 to be fixed on the positioning shaft 4 and move when indirectly connected.

[0022] The vertical shaft is provided with a torsion spring 10, which assists in opening the locking block 5 after the fuse 8 is melted by adding an initial outward force. The rotation block is in the form of a solid piece or a frame.

[0023] When the valve plate 2 is tilted at a certain angle to the horizontal direction, the bottom of the blocking plate is a bevel, and the angle of the bevel is greater than the tilt angle of the valve plate 3, and the bottom is stepped, such as Figure 3 Ensure that after the fuse is melted, the valve disc can move to the end of the spring contraction.

[0024] A fixing rod 9 is also provided below the positioning shaft, one end of which is connected to the positioning shaft 4 by a bolt 12, or is directly welded to the positioning shaft 4. The other end is connected to the vertical beam 3, or to the intersection of the lower end of the vertical shaft 7 and the vertical beam, which can reinforce the positioning shaft and ensure that the blocking pieces of the locking block 5 move in opposite directions.

[0025] The working principle of the fire check valve of the present invention is further described as follows:

[0026] In the normal ventilation state, the locking block 5 is fixed closed by the fuse 8, the spring 6 is in a stretched state, and the valve plate 2 can open and close freely. Figure 3 As shown, when a fire occurs, the smoke temperature is high, melting the fuse 8. The locking block 5 opens outward under the combined action of the tension of the spring 6 and the torsion spring 10. When the tension of the spring 6 and the friction of the locking block 5 are balanced, the locking block 5 and the valve disc 2 are perpendicularly pressed against each other. Because the lower edge of the locking block 5 is in contact with the valve disc 2 and the friction force acts on the locking block 5, the locking block 5 no longer rotates, and the valve disc 2 is locked and cannot be opened.

[0027] The locking element of the present invention is uniformly stressed by the spring, resulting in highly consistent and stable operation. The high spring tension allows for instant locking of the valve disc. The locked device offers high security and excellent sealing, making it difficult for the valve disc to open. During ventilation, the device maintains high strength and is less susceptible to failure. During normal ventilation, the self-locking mechanism does not obstruct the opening and closing of the valve disc, ensuring high ventilation capacity. The device also features a simple structure with a limited number of components, facilitating ease of production and assembly, resulting in low production costs.

Claims

1. A fire-proof check valve, comprising a valve body (1), a double-door valve disc (2) installed inside the valve body, and a vertical beam (3) located at the symmetric axis of the valve disc, characterized in that: Also includes: A self-locking device is installed inside the valve body (1), and the self-locking device includes a positioning shaft (4), a locking block (5), a spring (6), a fuse (8) and a vertical shaft (7) for connecting the locking block; both ends of the positioning shaft (4) are connected to the valve body (1) and are parallel to the vertical beam (3); the vertical shaft (7) connects the positioning shaft (4) and the vertical beam (3) and is perpendicular to the positioning shaft; the locking block (5) includes two blocks symmetrically arranged about the vertical shaft (7); one end of the spring (6) is connected to each block, and the other end is connected to the positioning shaft or the valve body; the fuse (8) is connected to each block, so that each block of the locking block (5) is in a closed state and the spring (6) is in a stretched state.

2. The fire-proof check valve according to claim 1, characterized in that: When the valve plate (2) is arranged at a certain angle to the horizontal direction, the bottom edge of the locking block (5) is in the shape of an oblique edge or a step.

3. The fire-proof check valve according to claim 1, characterized in that: The vertical shaft (7) is provided with a torsion spring (10) for assisting the locking block (5) in opening.

4. The fire-proof check valve according to claim 1, characterized in that: The locking block (5) is frame-shaped.

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