Anti-backflow high-temperature air pipe valve

Abstract

The invention provides an anti-backflow high-temperature air pipe valve and relates to the technical field of air pipe butterfly valves, a main body of a baffle is of a circular structure, the baffle is used for sealing a valve body, and a driver, a guide shaft and the baffle jointly form a valve structure. In order to solve the problems that in the forward flow state, high temperature can be generated once high-temperature gas in an air pipe generates reverse flow, high temperature can be generated, and other parts in the air pipe can be impacted and damaged due to heavy flow, in the forward flow state, two blocking plates arranged in a valve body can be synchronously overturned outwards to open the internal space of the valve body, so that the internal space of the valve body can be opened; and through the sealing arrangement of the baffle plate, the valve body can achieve a good anti-backflow effect when the air flow or the water body is blocked, compared with a traditional valve plate which is closed by means of gravity, the design can remarkably improve the opening and closing efficiency and the sealing effect of the air pipe, and then the purpose of being more practical is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of air duct butterfly valves, and in particular to a high-temperature air duct valve to prevent backflow. Background Art

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and adjust and control the parameters (temperature, pressure and flow) of the conveying medium. Duct valves are installed in ventilation ducts. Since they control the flow of fluid through the valve, when the valve is preventing backflow, it usually blocks the backflow of the medium by moving the valve disc and relying on its own weight and medium pressure. However, when the valve is closed simply by its own weight, the valve disc will wear out and other waste will be generated, causing the valve disc to close slowly and incompletely. If the valve disc in the valve does not close completely or closes slowly, the high-temperature gas inside the duct will generate a backflow, which will cause high temperature at the least, and will cause impact on the other components in the duct and cause damage to them at worst.

[0003] Therefore, in view of this, the existing structure and defects are studied and improved, and a high-temperature air duct valve for preventing backflow is provided, in order to achieve a more practical purpose. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a high-temperature air duct valve with anti-backflow, so as to solve the existing problem that if the valve disc in the valve is not completely closed or closes slowly, the high-temperature gas inside the air duct will flow back, which will at least cause high temperature to be generated, and at worst will cause impact on other components in the air duct and cause damage to them.

[0005] The present invention provides a high-temperature duct valve for preventing backflow, which specifically includes: a valve body, a driver is installed on the top surface of the valve body, an output shaft is arranged at the bottom end of the driver, the output shaft passes through the valve body toward the lower side, and is located on the inner side of the valve body for containment, and a guide shaft is installed on the bottom output shaft of the driver, the guide shaft is rotatably connected to the inner side of the valve body, and a baffle is fixedly connected to the outer side of the guide shaft, the main body of the baffle is a circular structure, and the baffle is used to close the valve body, and the driver, the guide shaft and the baffle together constitute a valve structure.

[0006] Furthermore, a through hole is opened inside the connecting piece, which is a connecting hole. Six through holes are opened inside each connecting piece in a circular array, and the through hole is used to pass the fixing bolt. A transmission shaft is installed inside the valve body, and the transmission shaft is located on the left side of the interior of the valve body. The bottom end of the transmission shaft is rotatably connected to the internal bottom end surface of the valve body. The transmission shaft is connected to the internal top end surface of the valve body through a bearing, and the valve body and the bearing installed inside it are used to guide the rotation of the transmission shaft.

[0007] Furthermore, the main body of the connecting piece is an annular structure, and there are two connecting pieces in total. The two connecting pieces are respectively fixedly connected to the end faces of the two connecting pieces on one side away from the two through holes of the valve body, and the diameter of the connecting piece is larger than the diameter of the connecting piece, and a through hole that penetrates the connecting piece is opened, and the connecting piece and the connecting piece together constitute a connection support structure for the valve body.

[0008] Furthermore, a through hole is opened inside the valve body, and the through hole is a two-way through structure on the left and right sides, and a connecting pipe is fixedly connected to the inside of the valve body. The main body of the connecting pipe is an annular structure, and there are two connecting pipes in total. The two connecting pipes are respectively fixedly connected to the left and right side positions of the valve body. The connecting pipe is connected to the valve body, and the diameter of the connecting pipe is smaller than the cross-sectional diameter of the valve body. A connecting piece is fixedly connected to the side of the connecting pipe away from the valve body.

[0009] Furthermore, a shift plate is fixedly connected to the outer circumferential surface of the transmission shaft, the shift plate and the transmission shaft are arranged vertically, and there are two shift plates in total, the two shift plates are fixedly connected to the front and rear sides of the outer circumferential surface of the transmission shaft in opposite directions, and the outer sides of the two shift plates are fixedly connected with magnetic blocks A, and the magnetic blocks A are staggered on the outer sides of the two shift plates fixedly connected to the outer circumferential surface of the transmission shaft. When the transmission shaft is in a rotating state, the shift plates and the magnetic blocks A arranged on the outer circumferential surface of the transmission shaft are in a synchronous following rotation state.

[0010] Furthermore, the transmission shaft is located on the left side of the driver, and fan blades are fixedly connected to the outer circumference of the transmission shaft. There are six fan blades in total, and the six fan blades are fixedly connected to the outer circumference of the transmission shaft in a circular array. When the wind flows into the connecting pipe located on the left side of the valve body, the fan blades rotate synchronously to the left, i.e., counterclockwise. When the wind flows into the interior of the valve body from the connecting pipe located on the right side of the valve body and drives the fan blades to rotate, the fan blades installed on the outer circumference of the transmission shaft rotate to the right, i.e., clockwise.

[0011] Furthermore, the magnetic block B is provided at two locations, and the two magnetic blocks B are respectively fixedly connected to the outer side surfaces of the two guide plates, and the magnetic block B matches the magnetic block A, and the magnetic pole directions of the magnetic block B and the magnetic block A are opposite, when the magnetic block A fixedly connected to the outer side of the paddle plate is in a state of approaching the magnetic block B fixedly connected to the outer side of the guide plate, the magnetic block B is in a state of magnetic repulsion generated by the magnetic block A fixedly connected to the outer side of the paddle plate, and when the magnetic block B is in a state of magnetic repulsion, the guide plate installed in the connecting plate is in a synchronous bending and rotating state, and a baffle is installed inside the valve body, and the baffle is provided at two locations, and the two baffles are oppositely arranged at the front and rear sides of the valve body, and the baffle is used to close the valve body, and the top of the baffle located at the rear side A gear A is coaxially installed on the end, and a gear B is also installed on the top surface of the valve body. Gear B is in a meshing state with gear A arranged on the top of the baffle. When gear A is in a rotating state, gear B is in a synchronous following and rotating state in the opposite direction. Pulley A is fixedly connected to the outer side of the driven shaft. Pulley A is provided at two locations. Another pulley A is coaxially installed at the top position of the baffle located on the front side, and belts A are also installed on the outer sides of the two pulleys A. Pulley A and belt A together constitute a transmission structure. Pulley B is also installed on the outer side of the driven shaft. Pulley B is located directly above pulley A. Pulley B is provided at two locations. Another pulley B is coaxially installed at the top position of gear B. Belts B are installed on the outer sides of the two pulleys B. Belts B and pulley B together constitute a friction transmission structure.

[0012] Furthermore, a driven shaft is installed on the top surface of the valve body, the driven shaft is connected to the top of the valve body by a bearing, and the driven shaft is located at the left side of the transmission shaft arranged in the valve body, and a mounting seat is fixedly connected to the outside of the driven shaft, the main body of the mounting seat is a circular structure, and the mounting seat is sleeved on the upper end of the driven shaft, the diameter of the mounting seat is larger than the diameter of the driven shaft, and the mounting seat is in a rotation state following the driven shaft, and a connecting plate is fixedly connected to the outside of the mounting seat, the connecting plate and the mounting seat are vertically arranged, and there are two connecting plates in total, the two connecting plates are fixedly connected to the front and rear side positions of the mounting seat in opposite directions, a notch is opened inside the connecting plate, and the connecting plate and the mounting seat together constitute a connecting structure, a guide plate is installed inside the notch opened inside the connecting plate, the guide plate and the notch opened in the connecting plate are in a hinged state, and the notch opened in the guide plate is a one-way through structure, the closed part in the notch in the guide plate is used to limit the one-way rotation of the connecting plate, and a magnetic block B is fixedly connected to the outside of the connecting plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, two baffles are arranged inside the valve body. Under normal circumstances, the two baffles can be used to realize that when the wind flow enters the valve tube from the left side, that is, in the downstream state, the two baffles arranged in the valve body can be synchronously flipped outward to open the internal space of the valve body, and the sealing setting of the baffles can achieve a good anti-backflow effect when the valve body blocks the wind flow or water. Compared with the traditional valve plate that relies on gravity to close, this design can significantly improve the opening and closing efficiency and sealing effect of the air duct, thereby achieving a more practical purpose.

[0014] 2. In the present invention, a transmission shaft and fan blades are arranged inside the valve body, so that when it is in use, if the gas entering the valve body flows back, the fan blades arranged on the outside of the transmission shaft can be synchronously pushed to rotate. At this time, the contact between the shift plate and the guide plate is realized to drive the current belt A and pulley A, as well as the belt B and pulley B to realize the active synchronization of the two baffles currently installed in the valve body. Automatic closing state, compared with the traditional valve plate that needs to rely on its own gravity when closing, this design can significantly avoid the problem of fluid backflow caused by the baffle plate not closing firmly due to wear and tear between the baffle plates, and significantly improves the opening and closing effect of the valve pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0016] In the attached picture: Figure 1 It shows a front side structural schematic diagram of a duct valve in a cut-away state according to an embodiment of the present invention; Figure 2 A schematic diagram of the structure of the air duct valve in a cut-away state of the valve tube according to an embodiment of the present invention is shown; Figure 3 It shows a front side structural schematic diagram of an air duct valve according to an embodiment of the present invention; Figure 4 A schematic diagram of the top view of the structure of the air duct valve according to an embodiment of the present invention is shown; Figure 5 A schematic diagram of the assembly structure of a valve body and a baffle plate of an air duct valve according to an embodiment of the present invention is shown; Figure 6 A schematic diagram of the top view of the structure of the air duct valve in a cut-away state according to an embodiment of the present invention is shown; Figure 7A schematic diagram of the motion structure of the air duct valve according to an embodiment of the present invention is shown, in which the arrows from left to right are: air inlet direction, baffle opening direction, transmission shaft rotation direction and air outlet direction, and the figure shows a downstream state; Figure 8 A schematic diagram of the motion structure of the air duct valve according to an embodiment of the present invention is shown, in which the arrows from right to left in the figure respectively indicate: air inlet direction, transmission shaft rotation direction, baffle opening direction and air outlet direction, and the figure shows a counter-flow state; Fig. 9 The air duct valve according to the embodiment of the present invention is shown. Figure 2 The enlarged structural diagram at A in the middle; Fig.10 The air duct valve according to the embodiment of the present invention is shown. Figure 2 Enlarged structural diagram at B in the middle.

[0017] Reference numerals list 1. Valve body; 2. Pipe connection; 3. Connector; 4. Connecting hole; 5. Driver; 6. Guide shaft; 7. Baffle; 8. Transmission shaft; 9. Fan blade; 10. Paddle; 11. Magnetic block A; 12. Driven shaft; 13. Mounting seat; 14. Connecting plate; 15. Guide plate; 16. Magnetic block B; 17. Pulley A; 18. Belt A; 19. Pulley B; 20. Belt B; 21. Block plate; 22. Gear A; 23. Gear B. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and examples.

[0019] Embodiment 1: As attached Figure 1 To Attachment Fig.10 As shown: The present invention provides a high-temperature air duct valve for backflow prevention, comprising: a valve body 1, a driver 5 is installed on the top surface of the valve body 1, an output shaft is arranged at the bottom end of the driver 5, the output shaft passes through the valve body 1 at the lower side, and is located on the inner side of the valve body 1 for containment, and a guide shaft 6 is installed on the bottom output shaft of the driver 5, the guide shaft 6 is rotatably connected to the inner side of the valve body 1, and a baffle 7 is fixedly connected to the outer side of the guide shaft 6, the main body of the baffle 7 is a circular structure, and the baffle 7 is used to close the valve body 1, the driver 5, the guide shaft 6 and the baffle 7 together constitute a valve structure, and a magnetic block B16 is arranged at two locations, and the two magnetic blocks B16 is respectively fixedly connected to the outer side of the guide plate 15 at two locations, and the magnetic block B16 matches the magnetic block A11, and the magnetic pole directions of the magnetic block B16 and the magnetic block A11 are opposite. When the magnetic block A11 fixedly connected to the outside of the dial plate 10 is in a state of approaching the magnetic block B16 fixedly connected to the outside of the guide plate 15, the magnetic block B16 is in a state of magnetic repulsion generated by the magnetic block A11 fixedly connected to the outside of the dial plate 10, and when the magnetic block B16 is in a state of magnetic repulsion, the guide plate 15 installed in the connecting plate 14 is in a synchronous bending state. The valve body 1 is in a rotating state, and a baffle 21 is installed inside the valve body 1. There are two baffles 21, and the two baffles 21 are arranged oppositely at the front and rear sides of the valve body 1. The baffle 21 is used to close the valve body 1, and a gear A22 is coaxially installed on the top of the baffle 21 located at the rear side. A gear B23 is also installed on the top surface of the valve body 1. The gear B23 is in a meshing state with the gear A22 arranged on the top of the baffle 21. When the gear A22 is in a rotating state, the gear B23 is in a synchronous following and reverse rotation state, and the outer side of the driven shaft 12 is fixedly connected to a pulley A17, and the belt There are two pulleys A17, and another pulley A17 is coaxially installed at the top position of the baffle 21 located on the front side, and a belt A18 is also installed on the outside of the two pulleys A17, and the pulley A17 and the belt A18 together constitute a transmission structure, and a pulley B19 is also installed on the outside of the driven shaft 12, and the pulley B19 is located directly above the pulley A17, and there are two pulleys B19, and another pulley B19 is coaxially installed at the top position of the gear B23, and a belt B20 is installed on the outside of the two pulleys B19, and the belt B20 and the pulley B19 together constitute a friction transmission structure.

[0020] Among them, a through hole is opened inside the connecting member 3, and the through hole is a connecting hole 4. Six through holes are opened in a circular array inside each connecting member 3, and the through hole is used to pass the fixing bolt, and a transmission shaft 8 is installed inside the valve body 1. The transmission shaft 8 is located on the left side of the inside of the valve body 1, and the bottom end of the transmission shaft 8 is a rotation connected to the internal bottom end surface of the valve body 1. The transmission shaft 8 is connected to the internal top end surface of the valve body 1 through a bearing. The valve body 1 and the bearing installed inside it are used to guide the rotation of the transmission shaft 8. The transmission shaft 8 is located at the driver 5. The left side position, and the fan blades 9 are fixedly connected to the outer circumference of the transmission shaft 8, and there are six fan blades 9 in total, and the six fan blades 9 are fixedly connected to the outer circumference of the transmission shaft 8 in a circular array, and the six fan blades 9 are in a state where the wind flows into the connecting pipe 2 located on the left side of the valve body 1, and the fan blades 9 are in a synchronous rotation to the left, that is, counterclockwise. When the wind flows into the interior of the valve body 1 from the connecting pipe 2 located on the right side of the valve body 1 and drives the fan blades 9 to rotate, the fan blades 9 installed on the outer circumference of the transmission shaft 8 rotate to the right, that is, clockwise.

[0021] During use: when the air duct valve is in use, the valve body 1 can be quickly installed by aligning the connecting pipe 2 and the connecting piece 3 fixedly connected to the outside of the valve body 1 with the external air duct, and simultaneously passing the bolts through the connecting holes 4 opened in the connecting piece 3. After the installation is completed, if it is necessary to control the opening and closing of the valve body 1, it can be opened by the driver 5 arranged on the top surface of the valve body 1, and when the driver 5 is opened, the guide shaft 6 arranged on the bottom output end of the driver 5 can be synchronously used to drive the baffle 7 installed in the valve body 1 to flip over. When the baffle 7 is opened, the wind flow inside it can pass smoothly, so as to achieve the purpose of controlling the opening and closing of the air duct.

[0022] Embodiment 2: Based on the first embodiment, a high-temperature air duct valve for preventing backflow is provided, which can realize rapid control of opening and closing of the airflow in the air duct, but still cannot realize normal forward flow, so the following technical solution is also provided.

[0023] Among them, a paddle 10 is fixedly connected to the outer circumference of the transmission shaft 8, the paddle 10 and the transmission shaft 8 are vertically arranged, and there are two paddles 10, the two paddles 10 are fixedly connected to the front and rear sides of the outer circumference of the transmission shaft 8 in opposite directions, and the outer sides of the two paddles 10 are fixedly connected with magnetic blocks A11, and the magnetic blocks A11 are staggered and arranged on the outer sides of the two paddles 10 fixedly connected to the outer circumference of the transmission shaft 8. When the transmission shaft 8 is in a rotating state, the paddle 10 and the magnetic blocks A11 arranged on the outer circumference of the transmission shaft 8 are in a synchronous following rotation state, and a driven shaft 12 is installed on the top surface of the valve body 1, and the driven shaft 12 is connected to the top of the valve body 1 through a bearing, and the driven shaft 12 is located on the left side of the transmission shaft 8 arranged in the valve body 1, and a mounting seat 13 is fixedly connected to the outer side of the driven shaft 12, and the main body of the mounting seat 13 is a circular structure, and the mounting seat 13 is installed. The seat 13 is sleeved on the upper end of the driven shaft 12, the diameter of the mounting seat 13 is larger than the diameter of the driven shaft 12, and the mounting seat 13 is in a rotation state following the driven shaft 12, and the outer side of the mounting seat 13 is fixedly connected with a connecting plate 14, the connecting plate 14 and the mounting seat 13 are vertically arranged, and there are two connecting plates 14, the two connecting plates 14 are fixedly connected to the front and rear side positions of the mounting seat 13 in opposite directions, a notch is opened inside the connecting plate 14, and the connecting plate 14 and the mounting seat 13 together constitute a connecting structure, and a guide plate 15 is installed inside the notch opened inside the connecting plate 14, the guide plate 15 and the notch opened in the connecting plate 14 are in a hinged state, and the notch opened in the guide plate 15 is a one-way through structure, the closed part in the notch in the guide plate 15 is used to limit the one-way rotation of the connecting plate 14, and the outer side of the connecting plate 14 is fixedly connected with a magnetic block B16.

[0024] When in use, if in the downstream state, that is, when the gas enters from the left side of the figure, the two baffles 21 arranged in the valve body 1 can be synchronously pushed to the right, so that the two baffles 21 arranged in the valve body 1 are in the open state in the clockwise and counterclockwise rotation states respectively. At this time, the gas can pass through the baffles 21 and smoothly enter the interior of the valve body 1 until it enters the interior of the connecting pipe 2 and is discharged. When in use, when the wind flow pushes the fan blades 9 arranged on the outside of the transmission shaft 8, when the fan blades 9 are in the counterclockwise rotation state, the magnetic block A11 arranged on the outside of the paddle plate 10 will magnetically repel the magnetic block B16 currently arranged on the outside of the guide plate 15, so that the guide plate 15 installed in the connecting plate 14 is flipped outward and synchronously is not in contact with the paddle plate 10. At this time, the fan blades 9 arranged on the outside of the transmission shaft 8 are in an idling state.

[0025] Embodiment three: Based on the anti-backflow high-temperature air duct valve provided in the second embodiment, it can realize the normal forward flow of airflow, but still cannot realize backflow protection, so the following technical solution is also provided.

[0026] Among them, a through hole is opened inside the valve body 1, and the through hole is a two-way through structure on the left and right sides, and a connecting pipe 2 is fixedly connected to the inside of the valve body 1. The main body of the connecting pipe 2 is an annular structure, and there are two connecting pipes 2. The two connecting pipes 2 are respectively fixedly connected to the left and right side positions of the valve body 1. The connecting pipe 2 is connected to the valve body 1, and the diameter of the connecting pipe 2 is smaller than the cross-sectional diameter of the valve body 1. A connecting piece 3 is fixedly connected to the side of the connecting pipe 2 away from the valve body 1. The main body of the connecting piece 3 is an annular structure, and there are two connecting pieces 3. The two connecting pieces 3 are respectively fixedly connected to the end faces of the two connecting pipes 2 on the side away from the two through holes of the valve body 1, and the diameter of the connecting piece 3 is larger than the diameter of the connecting piece 2, and a through hole connected to the connecting pipe 2 is opened, and the connecting piece 3 and the connecting pipe 2 together constitute a connection support structure for the valve body 1.

[0027] During use, when the wind flow reverses, that is, when the wind flow flows from the right to the left, the fan blades 9 arranged on the outside of the transmission shaft 8 can be synchronously driven to rotate, and the rotation of the fan blades 9 can be used to drive the current transmission shaft 8 to rotate counterclockwise. At this time, the paddle plate 10 arranged on the outside of the transmission shaft 8 is in meshing contact with the guide plate 15 arranged in the connecting plate 14 to synchronously drive the driven shaft 12 to rotate above the valve body 1, and when the guide plate 15 rotates, the pulley A17 and the pulley B19 installed on the outside of the driven shaft 12 can be synchronously driven to rotate, and when a single pulley A17 and a pulley B19 rotate, the friction transmission of the belt A18 and the belt B20 can be used to synchronously drive the pulleys A17 and B19 at another location. B19 rotates, and when the pulley A17 rotates, the baffle 21 installed on the front side of the valve body 1 can be synchronously driven to rotate counterclockwise until it is closed. When the pulley B19 is in a rotating state, it can synchronously drive the gear B23 installed on the top of the valve body 1 to rotate, and when the gear B23 rotates, it can synchronously engage with the gear A22 set at the top of the valve body 1 to drive the baffle 21 on the rear side of the valve body 1 to rotate and close with the baffle 21 on the front side until the current opening of the valve body 1 is quickly closed, and when the downstream wind flow in the valve body 1 increases, the two baffles 21 installed in the valve body 1 can be synchronously pushed outward until the current wind flow passes normally.

Claims

1. A high-temperature air duct valve for preventing backflow, characterized in that: include: A valve body (1), wherein a driver (5) is mounted on the top surface of the valve body (1), an output shaft is arranged at the bottom end of the driver (5), the output shaft passes through the valve body (1) toward the bottom side, and is located on the inner side of the valve body (1) as a containment, and a guide shaft (6) is mounted on the output shaft at the bottom end of the driver (5), the guide shaft (6) is rotatably connected to the inner side of the valve body (1), and a baffle (7) is fixedly connected to the outer side of the guide shaft (6), the main body of the baffle (7) is a circular structure, and the baffle (7) is used to close the valve body (1), and the driver (5), the guide shaft (6) and the baffle (7) together constitute a valve structure.

2. The high-temperature air duct valve for preventing backflow according to claim 1, characterized in that: The valve body (1) is provided with a through hole inside, the through hole being a bidirectional through structure on the left and right sides, and a connecting pipe (2) is fixedly connected inside the valve body (1), the main body of the connecting pipe (2) is an annular structure, and the connecting pipe (2) is provided at two locations, the two connecting pipes (2) are respectively fixedly connected to the left and right side positions of the valve body (1), the connecting pipe (2) and the valve body (1) are connected, and the diameter of the connecting pipe (2) is smaller than the cross-sectional diameter of the valve body (1), and a connecting piece (3) is fixedly connected to the side of the connecting pipe (2) away from the valve body (1).

3. A high-temperature air duct valve for preventing backflow as claimed in claim 2, characterized in that: The main body of the connecting piece (3) is an annular structure, and the connecting piece (3) is provided at two locations. The two connecting pieces (3) are respectively fixedly connected to the end faces of the two connecting pipes (2) on the side away from the two through holes of the valve body (1), and the diameter of the connecting piece (3) is larger than the diameter of the connecting pipe (2), and a through hole that penetrates the connecting pipe (2) is provided, and the connecting piece (3) and the connecting pipe (2) together constitute a connection support structure for the valve body (1).

4. A high-temperature air duct valve for preventing backflow as claimed in claim 3, characterized in that: The connecting member (3) is provided with a through hole inside, which is a connecting hole (4). Six through holes are provided inside each connecting member (3) in a circular array, and the through holes are used to pass the fixing bolts. A transmission shaft (8) is installed inside the valve body (1). The transmission shaft (8) is located on the left side inside the valve body (1), and the bottom end of the transmission shaft (8) is rotatably connected to the bottom end surface inside the valve body (1). The transmission shaft (8) is connected to the top end surface inside the valve body (1) via a bearing. The valve body (1) and the bearing installed inside the valve body (1) are used to guide the rotation of the transmission shaft (8).

5. A high-temperature air duct valve for preventing backflow as claimed in claim 4, characterized in that: The transmission shaft (8) is located at the left side of the driver (5), and the outer peripheral surface of the transmission shaft (8) is fixedly connected with a fan blade (9), and the fan blade (9) is provided at a total of six locations, and the six fan blades (9) are fixedly connected to the outer peripheral surface of the transmission shaft (8) in a ring array, and when the wind flow enters from the connecting pipe (2) located on the left side of the valve body (1), the fan blade (9) is in a synchronous state of rotating to the left, that is, counterclockwise, and when the wind flow enters from the connecting pipe (2) located on the right side of the valve body (1) into the interior of the valve body (1) and drives the fan blade (9) to rotate, the fan blade (9) installed on the outer peripheral surface of the transmission shaft (8) rotates to the right, that is, clockwise.

6. A high-temperature air duct valve for preventing backflow as claimed in claim 5, characterized in that: A shift plate (10) is fixedly connected to the outer circumference of the transmission shaft (8), the shift plate (10) and the transmission shaft (8) are arranged vertically, and there are two shift plates (10) in total, the two shift plates (10) are fixedly connected to the front and rear sides of the outer circumference of the transmission shaft (8) in opposite directions, and the outer sides of the two shift plates (10) are fixedly connected to magnetic blocks A (11), the magnetic blocks A (11) are staggeredly arranged on the outer sides of the two shift plates (10) fixedly connected to the outer circumference of the transmission shaft (8), and when the transmission shaft (8) is in a rotating state, the shift plates (10) and the magnetic blocks A (11) arranged on the outer circumference of the transmission shaft (8) are in a synchronous follow-rotating state.

7. The high-temperature air duct valve for preventing backflow according to claim 1, characterized in that: A driven shaft (12) is mounted on the top surface of the valve body (1), the driven shaft (12) and the top of the valve body (1) are connected via a bearing, the driven shaft (12) is located on the left side of a transmission shaft (8) arranged in the valve body (1), and a mounting seat (13) is fixedly connected to the outside of the driven shaft (12), the main body of the mounting seat (13) is a circular structure, the mounting seat (13) is sleeved on the upper end of the driven shaft (12), the diameter of the mounting seat (13) is larger than the diameter of the driven shaft (12), the mounting seat (13) is in a rotation state following the driven shaft (12), and a connecting plate (14) is fixedly connected to the outside of the mounting seat (13), the connecting plate (14) and the mounting seat (13) are vertically connected. The connecting plates (14) are arranged in a straight line, and two connecting plates (14) are provided. The two connecting plates (14) are fixedly connected to the front and rear side surfaces of the mounting seat (13) in opposite directions. A notch is provided inside the connecting plate (14), and the connecting plate (14) and the mounting seat (13) together form a connecting structure. A guide plate (15) is installed inside the notch provided inside the connecting plate (14). The guide plate (15) and the notch provided in the connecting plate (14) are in a hinged state, and the notch provided in the guide plate (15) is a one-way through structure. The closed part in the notch in the guide plate (15) is used to limit the one-way rotation of the connecting plate (14), and a magnetic block B (16) is fixedly connected to the outer side of the connecting plate (14).

8. A high-temperature air duct valve for preventing backflow as claimed in claim 7, characterized in that: The magnetic block B (16) is provided at two locations, and the two magnetic blocks B (16) are respectively fixedly connected to the outer side surfaces of the two guide plates (15), and the magnetic block B (16) matches the magnetic block A (11), and the magnetic pole directions of the magnetic block B (16) and the magnetic block A (11) are opposite. When the magnetic block A (11) fixedly connected to the outer side of the paddle plate (10) is in a state of approaching the magnetic block B (16) fixedly connected to the outer side of the guide plate (15), the magnetic block B (16) is in a state of being affected by the magnetic block A (11) fixedly connected to the outer side of the paddle plate (10). When the magnetic block A (11) is in a state of magnetic repulsion generated by the fixedly connected magnetic block, and when the magnetic block B (16) is in a state of magnetic repulsion, the guide plate (15) installed in the connecting plate (14) is in a synchronous bending and rotating state, and a blocking plate (21) is installed inside the valve body (1), and the blocking plates (21) are provided at two locations, and the two blocking plates (21) are arranged oppositely at the front and rear sides of the valve body (1), and the blocking plates (21) are used to close the valve body (1), and the gear A ( 22), a gear B (23) is also installed on the top surface of the valve body (1), and the gear B (23) is in a meshing state with the gear A (22) arranged at the top of the baffle (21). When the gear A (22) is in a rotating state, the gear B (23) is in a synchronous following and reverse rotating state, and the outer side of the driven shaft (12) is fixedly connected with a pulley A (17), and the pulley A (17) is provided at two locations, and the other pulley A (17) is coaxially installed at the top position of the baffle (21) located at the front side, and the two pulleys A (17) A belt A (18) is also installed on the outer side of the driven shaft (12), and the pulley A (17) and the belt A (18) together form a transmission structure. A pulley B (19) is also installed on the outer side of the driven shaft (12), and the pulley B (19) is located directly above the pulley A (17). There are two pulleys B (19), and the other pulley B (19) is coaxially installed at the top position of the gear B (23). Belts B (20) are installed on the outer sides of the two pulleys B (19), and the belt B (20) and the pulley B (19) together form a friction transmission structure.

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