Fireproof check valve with locking structure

Abstract

The application discloses a fireproof check valve with a locking structure, which comprises a valve body, the valve body is formed with a valve hole, the left end of the valve hole is provided with a valve sheet, the upper end of the valve sheet is inserted into a rotating shaft, and the rotating shaft is fixed in a rectangular groove of the valve body; the upper end of the valve body is formed with a circular arc hole, a half-tooth ring is sleeved in the circular arc hole, the half-tooth ring is engaged with a rack, and the rack is inserted into a rack guide hole in the valve body; the rack is provided with an elastic supporting structure and a locking structure; the left end of the rack is pressed against a stop lever, the stop lever is inserted into a stepped hole of the valve body, the lower end of the stop lever is fixed with a supporting block, and the first compression spring is clamped between the supporting block and the stepped hole; the supporting block is fixed with a fusible alloy column, the fusible alloy column is fixed with a supporting frame, and the supporting frame is fixed in the valve body; and the left end of the half-tooth ring is fixed with a pressing foot. The application can lock the valve sheet, can effectively prevent fire and smoke in high-temperature environment, and has simple and stable structure.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more specifically to a fireproof check valve with a locking structure. Background Technology

[0002] Existing fireproof check valves include a valve body, valve plate, connecting rod, lever, temperature sensing element, and elastic element. The valve body has an exhaust port, which is covered by the valve plate. The valve plate is connected to the valve body via the connecting rod, and the lever is rotatably connected to the valve body. The temperature sensing element is fixed to the valve body. One end of the elastic element is fixedly connected to the valve body, and the other end is connected to the lever, driving the lever to abut against the temperature sensing element. When the temperature sensing element activates, the elastic element drives the lever to rotate relative to the valve body and presses against the connecting rod, causing the lever to close the exhaust port through the valve plate. When the temperature sensing element activates, and the elastic element is continuously heated to the point of losing its elasticity, the lever easily separates from the connecting rod under the influence of airflow. When the lever separates from the connecting rod under the influence of airflow, the valve plate will drive the connecting rod to rotate relative to the valve body under the influence of airflow, thus opening the exhaust port. This causes the fireproof check valve to lose its fireproof and smoke-proof function in high-temperature environments. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a fireproof check valve with a locking structure, which can lock the valve plate and effectively provide fireproof and smoke-proof functions in high-temperature environments; at the same time, its structure is simple and stable.

[0004] The solution of the present invention to the aforementioned technical problem is:

[0005] A fireproof check valve with a locking structure includes a valve body, a valve hole formed in the middle of the valve body, a valve plate provided at the left end of the valve hole, the upper end of the valve plate being inserted into a rotating shaft, and the rotating shaft being fixed in a rectangular groove in the valve body.

[0006] The upper end of the valve body is formed with an arc-shaped hole coaxial with the rotating shaft. A semi-toothed ring is sleeved in the arc-shaped hole, and the semi-toothed ring meshes with a horizontally arranged rack. The rack is inserted into a rack guide hole in the valve body. The rack is provided with an elastic support structure and a locking structure. The left end of the rack presses against a stop rod, which is inserted into the small end hole of the stepped hole in the valve body. A support block is fixed to the lower end of the stop rod, and a first compression spring is clamped between the support block and the stepped surface of the stepped hole. The lower end of the support block is fixed to the upper end of the fusible alloy column, and the lower end of the fusible alloy column is fixed to a support frame, which is fixed inside the valve body. A pressure foot is fixed to the left end of the semi-toothed ring, and the pressure foot is located on the upper left side of the valve plate.

[0007] The elastic support structure includes a connecting block fixed in the middle of the rack, the connecting block being fixed to one end of the second compression spring, and the other end of the second compression spring being fixed to the bottom surface of the spring hole inside the valve body.

[0008] The right end of the rack is formed with a rectangular hole with an opening on the lower side;

[0009] A rectangular countersunk hole is formed at the right end of the rack guide hole;

[0010] The locking structure includes a rectangular pin inserted into a rectangular countersunk hole, a third compression spring clamped between the lower end of the rectangular pin and the bottom surface of the rectangular countersunk hole, and a tapered portion formed at the upper end of the rectangular pin, with a rounded tip that presses against the lower end of the rack. The rectangular pin can be inserted into the rectangular hole.

[0011] The upper end of the valve plate is formed with a limiting surface, and the distance L1 between the limiting surface and the rotating shaft is equal to the distance L2 between the right side wall of the rectangular groove and the rotating shaft.

[0012] The melting temperature of the fusible alloy column is between 70℃ and 90℃.

[0013] The outstanding advantages of this invention are: compared with the prior art, it can lock the valve plate, effectively providing fire prevention and smoke isolation functions in high-temperature environments; at the same time, its structure is simple and stable. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention;

[0015] Figure 2 for Figure 1 A magnified view of a specific area (A);

[0016] Figure 3 This is a schematic diagram of the structure after the present invention is melted. Detailed Implementation

[0017] For example, see below. Figures 1 to 3 As shown, a fireproof check valve with a locking structure includes a valve body 1, a valve hole 11 formed in the middle of the valve body 1, a valve plate 2 provided at the left end of the valve hole 11, the upper end of the valve plate 2 being inserted into a rotating shaft 3, and the rotating shaft 3 being fixed in a rectangular groove 12 of the valve body 1.

[0018] The upper end of the valve body 1 is formed with an arc-shaped hole 13 coaxial with the rotating shaft 3. A semi-toothed ring 41 is sleeved in the arc-shaped hole 13. The semi-toothed ring 41 meshes with a horizontally arranged rack 42. The rack 42 is inserted into a rack guide hole 15 inside the valve body 1. The rack 42 is provided with an elastic support structure 5 and a locking structure 6. The left end of the rack 42 presses against a stop rod 43. The stop rod 43 is inserted into the small end hole of the stepped hole 14 of the valve body 1. A support block 44 is fixed to the lower end of the stop rod 43. A first compression spring 45 is clamped between the support block 44 and the stepped surface of the stepped hole 14. The lower end of the support block 44 is fixed to the upper end of the fusible alloy column 46. The lower end of the fusible alloy column 46 is fixed to a support frame 47. The support frame 47 is fixed inside the valve body 1. A pressure foot 48 is fixed to the left end of the semi-toothed ring 41. The pressure foot 48 is located above the left side of the valve plate 2.

[0019] Furthermore, the elastic support structure 5 includes a connecting block 51 fixed in the middle of the rack 42. The connecting block 51 is fixed to one end of the second compression spring 52, and the other end of the second compression spring 52 is fixed to the bottom surface of the spring hole 16 inside the valve body 1.

[0020] Furthermore, the right end of the rack 42 is formed with a rectangular hole 421 with an opening on the lower side;

[0021] A rectangular countersunk hole 17 is formed at the right end of the rack guide hole 15;

[0022] The locking structure 6 includes a rectangular pin 61 that is inserted into a rectangular countersunk hole 17. A third compression spring 62 is held between the lower end of the rectangular pin 61 and the bottom surface of the rectangular countersunk hole 17. The upper end of the rectangular pin 61 is formed with a tapered portion 63, and the tip of the tapered portion 63 is formed with a rounded corner 64. The rounded corner 64 presses against the lower end of the rack 42. The rectangular pin 61 can be inserted into the rectangular hole 421.

[0023] Furthermore, the upper end of the valve plate 2 is formed with a limiting surface 21, and the distance L1 between the limiting surface 21 and the rotating shaft 3 is equal to the distance L2 between the right side wall of the rectangular groove 12 and the rotating shaft 3.

[0024] Furthermore, the melting temperature of the fusible alloy column 46 is between 70°C and 90°C.

[0025] Working principle: When in a high-temperature environment, the fusible alloy column 46 melts, and the support block 44 moves down automatically under the action of the first compression spring. The support block 44 drives the stop rod 43 to move down, and the stop rod 43 releases its obstruction of the rack 42. The rack moves to the left automatically under the action of the second compression spring 52. The rack 42 drives the half-tooth ring 41 to rotate, and the half-tooth ring 41 drives the pressure foot 48 to rotate. The pressure foot 42 presses against the valve plate and drives the valve plate to rotate. When the limiting surface at the upper end of the valve plate presses against the right side wall of the rectangular groove 12, the rectangular pin 61 is just aligned with the rectangular hole 421 and is inserted into the rectangular hole under the action of the third compression spring 62, thereby locking the rack and fixing the valve plate.

[0026] Finally, the above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the present invention, and the patent protection scope of the present invention should be defined by the claims.

Claims

1. A fireproof check valve with a locking structure, comprising a valve body (1), characterized in that: The valve body (1) has a valve hole (11) formed in the middle. A valve plate (2) is provided at the left end of the valve hole (11). The upper end of the valve plate (2) is inserted into the rotating shaft (3). The rotating shaft (3) is fixed in the rectangular groove (12) of the valve body (1). The upper end of the valve body (1) is formed with an arc hole (13) coaxial with the rotating shaft (3). A semi-toothed ring (41) is sleeved in the arc hole (13). The semi-toothed ring (41) meshes with a horizontally arranged rack (42). The rack (42) is inserted into the rack guide hole (15) in the valve body (1). The rack (42) is provided with an elastic support structure (5) and a locking structure (6). The left end of the rack (42) presses against the stop rod (43). The stop rod (43) is inserted into the stepped hole (15) of the valve body (1). 4) Inside the small end hole, the lower end of the stop rod (43) is fixed with a support block (44), and the support block (44) and the stepped surface of the stepped hole (14) are clamped together with a first compression spring (45); the lower end of the support block (44) is fixed with the upper end of the fusible alloy column (46), the lower end of the fusible alloy column (46) is fixed with the support frame (47), and the support frame (47) is fixed inside the valve body (1); the left end of the half tooth ring (41) is fixed with a pressure foot (48), and the pressure foot (48) is located above the left side of the valve plate (2); The right end of the rack (42) is formed with a rectangular hole (421) with an opening on the lower side. A rectangular countersunk hole (17) is formed at the right end of the rack guide hole (15). The locking structure (6) includes a rectangular pin (61) inserted into a rectangular countersunk hole (17). A third compression spring (62) is held between the lower end of the rectangular pin (61) and the bottom surface of the rectangular countersunk hole (17). The upper end of the rectangular pin (61) is formed with a cone (63), and the tip of the cone (63) is formed with a rounded corner (64). The rounded corner (64) presses against the lower end of the rack (42). The rectangular pin (61) can be inserted into the rectangular hole (421).

2. A fireproof check valve with a locking structure according to claim 1, characterized in that: The elastic support structure (5) includes a connecting block (51) fixed in the middle of the rack (42), the connecting block (51) is fixed at one end of the second compression spring (52), and the other end of the second compression spring (52) is fixed on the bottom surface of the spring hole (16) inside the valve body (1).

3. A fireproof check valve with a locking structure according to claim 1, characterized in that: The upper end of the valve plate (2) is formed with a limiting surface (21), and the distance L1 between the limiting surface (21) and the rotating shaft (3) is equal to the distance L2 between the right side wall of the rectangular groove (12) and the rotating shaft (3).

4. A fireproof check valve with a locking structure according to claim 1, characterized in that: The melting temperature of the fusible alloy column (46) is 70℃-90℃.

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