Anti-backflow device of air valve

Abstract

The anti-backflow device of the air valve comprises an air cylinder and the air valve, the air valve is installed in the air cylinder, circulation of air in the air cylinder is controlled through the air valve, sliding grooves are symmetrically formed in the inner wall of the air cylinder, a threaded rod is rotationally connected into the sliding groove in one side, a first bevel gear is installed on the outer surface of the threaded rod, and the first bevel gear is meshed with a second bevel gear. A motor is installed at one end of the second bevel gear and fixedly installed on the side face of the air duct. When the air valve is closed, the motor drives the matching plate to descend, the matching plate drives the anti-backflow plates to rotate around the rotating shaft, and the two anti-backflow plates cover the right end of the air duct in a rotating mode, so that the two anti-backflow plates block the air outlet of the air duct, and the situation that poisonous and harmful gas flows backwards and leaks when the valve clack is not closed tightly can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the field of air valves, in particular to an anti-backflow device for air valves. Background Art

[0002] The air valve is a device used in ventilation systems, which is mainly used to control and adjust the ventilation volume, and block the airflow when not working, so as to achieve the effects of sealing, shading and heat preservation. It consists of a single circular door plate or two semicircular door plates, which are opened and closed by rotating around a rotating axis. The working principle of the air valve is to change the air flow rate and flow rate in the air duct by controlling the valve plate to flip or move, so as to achieve the effect of controlling the air flow direction and distributing the air flow rate. When the air valve is used for a long time, resulting in the valve disc not being closed tightly, gas backflow will occur. It is necessary to avoid the backflow of gas, especially when used in chemical sites, to prevent the backflow and leakage of toxic and harmful gases. Therefore, those skilled in the art provide a backflow prevention device for an air valve to solve the problems raised in the above background technology. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides an anti-backflow device of an air valve, comprising an air cylinder and an air valve, wherein the air valve is installed inside the air cylinder, and the air circulation inside the air cylinder is controlled by the air valve, and the inner wall of the air cylinder is symmetrically provided with slide grooves, and a threaded rod is rotatably connected inside the slide groove on one side, and a bevel gear 1 is installed on the outer surface of the threaded rod, and the bevel gear 1 is meshed with the bevel gear 2, and a motor is installed at one end of the bevel gear 2, and the motor is fixedly installed on the side of the air cylinder;

[0004] A matching plate is arranged inside the air duct, a cross bar is symmetrically installed on the side of the matching plate, a matching block is installed at one end of the cross bar, a rotating block 1 is symmetrically arranged at the right end of the matching plate, an anti-backflow plate is symmetrically arranged at the right end of the air duct, a rotating block 2 is installed at one end of the anti-backflow plate, a rotating shaft is installed inside the rotating block 2, and a torsion spring is symmetrically arranged on the outer surface of the rotating shaft;

[0005] A hidden groove is arranged at the left end of the anti-backflow plate, a fixed shaft is installed inside the hidden groove, the outer surface of the fixed shaft is rotatably connected to the rotating block three, a connecting rod is installed at one end of the rotating block three, and the connecting rod is fixedly connected to the rotating block one.

[0006] Preferably: a guide rod is installed inside the slide groove on the other side.

[0007] Preferably, the matching block and the threaded rod are threadedly connected on one side, and the matching block and the guide rod are slidably connected on the other side.

[0008] Preferably: a conical block is installed at the left end of the matching plate.

[0009] Preferably: one end of the torsion spring is fixedly connected to the second rotating block, and the other end of the torsion spring is fixedly connected to the second baffle.

[0010] Preferably, two ends of the rotating block 1 are rotatably connected to baffle 1, and baffle 1 is fixedly connected to the matching plate.

[0011] Preferably, two ends of the rotating shaft are rotatably connected to baffle plate 2, and baffle plate 2 is fixedly connected to the air duct.

[0012] Technical effects and advantages of the utility model:

[0013] When the air valve of the utility model is closed, the motor drives the matching plate to descend, and the matching plate drives the backflow prevention plate to rotate around the rotating shaft. The two backflow prevention plates rotate to cover the right end of the wind tube, so that the two backflow prevention plates block the air outlet of the wind tube, which can effectively prevent the backflow and leakage of toxic and harmful gases when the valve disc is not tightly closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of this application;

[0015] Figure 2 It is a structural schematic diagram of the air duct of the present application;

[0016] Figure 3 It is a structural schematic diagram of the chute of the present application;

[0017] Figure 4 It is a structural schematic diagram of the backflow prevention plate of the present application;

[0018] In the figure: 1. air cylinder; 2. air valve; 4. slide groove; 5. threaded rod; 6. bevel gear one; 7. bevel gear two; 8. motor; 9. guide rod; 10. matching plate; 11. cross bar; 12. matching block; 13. rotating block one; 14. baffle one; 15. anti-backflow plate; 16. rotating block two; 17. rotating shaft; 18. baffle two; 19. torsion spring; 20. hidden groove; 21. rotating block three; 22. fixed shaft; 23. connecting rod. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific purposes.

[0020] See also Figures 1 to 4In this embodiment, a backflow prevention device for an air valve is provided, including an air cylinder 1 and an air valve 2. The air valve 2 is installed inside the air cylinder 1, and the air circulation inside the air cylinder 1 is controlled by the air valve 2. A slide groove 4 is symmetrically provided on the inner wall of the air cylinder 1. A threaded rod 5 is rotatably connected inside the slide groove 4 on one side. A bevel gear 1 6 is installed on the outer surface of the threaded rod 5. The bevel gear 1 6 is meshed with the bevel gear 2 7. A motor 8 is installed at one end of the bevel gear 2 7, and the motor 8 is fixedly installed on the side of the air cylinder 1. A guide rod 9 is installed inside the slide groove 4 on the other side. A matching plate 10 is arranged inside the air cylinder 1. A cross bar 11 is symmetrically installed on the side of the matching plate 10. A matching block 12 is installed at one end of the cross bar 11. The matching block 12 on one side is threadedly connected to the threaded rod 5, and the matching block 12 on the other side is slidably connected to the guide rod 9. A conical block is installed at the left end of the matching plate 10, and a conical block is installed at the right end of the matching plate 10. A rotating block 13 is symmetrically arranged, and both ends of the rotating block 13 are rotatably connected to a baffle 14, and the baffle 14 is fixedly connected to the matching plate 10. An anti-backflow plate 15 is symmetrically arranged on the right end of the wind tube 1, and a rotating block 2 16 is installed at one end of the anti-backflow plate 15. A rotating shaft 17 is installed inside the rotating block 2 16, and both ends of the rotating shaft 17 are rotatably connected to a baffle 2 18, and the baffle 2 18 is fixedly connected to the wind tube 1. A torsion spring 19 is symmetrically arranged on the outer surface of the rotating shaft 17, and one end of the torsion spring 19 is fixedly connected to the rotating block 2 16, and the other end of the torsion spring 19 is fixedly connected to the baffle 2 18. A hidden groove 20 is opened at the left end of the anti-backflow plate 15, and a fixed shaft 22 is installed inside the hidden groove 20. The outer surface of the fixed shaft 22 is rotatably connected to a rotating block 3 21, and a connecting rod 23 is installed at one end of the rotating block 3 21, and the connecting rod 23 is fixedly connected to the rotating block 13.

[0021] The working principle of the utility model is: when the air valve 2 is closed, the motor 8 works to drive the bevel gear 2 7 to rotate, the bevel gear 2 7 and the bevel gear 1 6 are meshed to drive the threaded rod 5 to rotate, the threaded rod 5 and a matching block 12 are threadedly connected to drive the cross bar 11 to descend, the cross bar 11 drives the matching plate 10 to descend, the matching plate 10 drives the anti-backflow plate 15 to rotate around the rotating shaft 17 through the rotating block 13, the connecting rod 23 and the rotating block 3 21, the anti-backflow plate 15 is rotated to cover the right end of the wind tube 1, and the two anti-backflow plates 15 are rotated to cover the right end of the wind tube 1, so that the two anti-backflow plates 15 block the air outlet of the wind tube 1 to prevent gas from flowing back through the air outlet.

[0022] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. Structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to conventional means in the field unless otherwise specified and limited.

Claims

1. A backflow prevention device for an air valve, comprising an air cylinder (1) and an air valve (2), characterized in that: The wind tube (1) is provided with a wind valve (2) to control the air flow inside the wind tube (1). The inner wall of the wind tube (1) is provided with symmetrical sliding grooves (4). A threaded rod (5) is rotatably connected inside the sliding groove (4) on one side. A bevel gear (6) is provided on the outer surface of the threaded rod (5). The bevel gear (6) is meshed with the bevel gear (7). A motor (8) is provided at one end of the bevel gear (7), and the motor (8) is fixedly installed on the side of the wind tube (1). A matching plate (10) is arranged inside the air duct (1), a cross bar (11) is symmetrically mounted on the side of the matching plate (10), a matching block (12) is mounted on one end of the cross bar (11), a rotating block (13) is symmetrically mounted on the right end of the matching plate (10), an anti-backflow plate (15) is symmetrically arranged on the right end of the air duct (1), a rotating block (16) is mounted on one end of the anti-backflow plate (15), a rotating shaft (17) is mounted inside the rotating block (16), and a torsion spring (19) is symmetrically mounted on the outer surface of the rotating shaft (17); A hidden groove (20) is provided at the left end of the backflow prevention plate (15), a fixed shaft (22) is installed inside the hidden groove (20), the outer surface of the fixed shaft (22) is rotatably connected to the rotating block three (21), a connecting rod (23) is installed at one end of the rotating block three (21), and the connecting rod (23) is fixedly connected to the rotating block one (13).

2. The anti-backflow device of the air valve according to claim 1, characterized in that: A guide rod (9) is installed inside the slide groove (4) on the other side.

3. The anti-backflow device of the air valve according to claim 1, characterized in that: The matching block (12) and the threaded rod (5) are threadedly connected on one side, and the matching block (12) and the guide rod (9) are slidably connected on the other side.

4. The anti-backflow device of the air valve according to claim 1, characterized in that: A conical block is installed at the left end of the matching plate (10).

5. The anti-backflow device of the air valve according to claim 1, characterized in that: One end of the torsion spring (19) is fixedly connected to the second rotating block (16), and the other end of the torsion spring (19) is fixedly connected to the second baffle (18).

6. The anti-backflow device of the air valve according to claim 1, characterized in that: The two ends of the rotating block 1 (13) are rotatably connected to the baffle plate 1 (14), and the baffle plate 1 (14) is fixedly connected to the matching plate (10).

7. The anti-backflow device of the air valve according to claim 1, characterized in that: The two ends of the rotating shaft (17) are rotatably connected to the second baffle plate (18), and the second baffle plate (18) is fixedly connected to the air duct (1).

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