High-temperature-resistant fan for industrial boiler

Abstract

The invention relates to the field of industrial boilers, and provides a high-temperature-resistant fan for an industrial boiler, which comprises a blower device, a heat dissipation device, an anti-reflux device and a controller, the blower device is arranged on the ground; the heat dissipation device is connected with the blower device and used for dissipating heat of the blower device; the backflow prevention device is arranged on the blower device and used for preventing boiler fire backflow. And the controller is electrically connected with the blower device and the heat dissipation device. By arranging the anti-reflux device, the technical effects that operators are prevented from being instantly burnt and the blast equipment is easily damaged due to the fact that flames flow backwards and backwards after the blast equipment is powered off accidentally are achieved.

Description

Technical Field

[0001] The invention relates to the field of industrial boilers, and in particular to a high-temperature resistant fan for industrial boilers. Background Art

[0002] The working principle of industrial boilers is mainly to use the high-temperature flue gas generated by the combustion of fuel in the furnace, transfer the heat to the water in the drum through the heat exchanger, and heat the water into steam or hot water. Specifically, the fuel and air are mixed and burned in the furnace, and the high-temperature flue gas generated enters the heat exchanger through the flue, and exchanges heat with the water in the drum, thereby realizing the transfer of heat energy. The boiler room has a special environment with high temperature, high humidity, high dust, and strong corrosion. The material of the fan and fan impeller should have the characteristics of high temperature resistance, corrosion resistance, and wear resistance. Commonly used materials include cast iron, steel plate, stainless steel, and carbon steel. The specific selection needs to be comprehensively considered according to the actual use environment.

[0003] In the current boiler operating system, measures to prevent flame backflow after an accidental power failure of the auxiliary blower mainly rely on rapid manual intervention to cut off the airflow channel between the blower and the boiler by manually operating the baffle. However, this method has significant risks in emergency situations: the high temperature environment accompanied by flame backflow may put the operator at risk of immediate burns. If the response is not quick enough, the safety threat will increase sharply, posing a safety hazard that cannot be ignored. The existing boiler system relies on rapid manual response and high vigilance to protect against blower power failures and prevent workers from accidental scalding, but this model is insufficient in both efficiency and safety. A more intelligent and timely protection mechanism is urgently needed to replace traditional manual operation to ensure the safety of operators. Therefore, we provide a high-temperature resistant blower for industrial boilers. Summary of the invention

[0004] The present invention aims to solve the technical problem of how to avoid flame backflow and reflux caused by accidental power failure of the blast equipment, thereby causing immediate burns to the operators and easily damaging the blast equipment. A high-temperature resistant fan for industrial boilers is provided.

[0005] The technical solution adopted by the present invention to solve its technical problem is: A high temperature resistant fan for an industrial boiler comprises: an air blast device, a heat sink device, an anti-backflow device, and a controller; the air blast device is arranged on the ground; the heat sink device is connected to the air blast device for dissipating heat from the air blast device; the anti-backflow device is arranged on the air blast device for preventing backflow of boiler fire; the controller is electrically connected to the air blast device and the heat sink device.

[0006] When it is necessary to blow air to the industrial boiler, the staff controls the blower to open through the controller, and the blower blows air to the industrial boiler. The heat dissipation device is used to dissipate heat and protect the blower. When it is not necessary to blow air to the industrial boiler, the staff controls the blower to close through the controller, and the anti-backflow device can prevent the fire in the industrial boiler from backflowing into the blower, thereby protecting the staff and the blower.

[0007] Furthermore, the blowing device includes a fan housing, a motor, a heat-resistant shell, centrifugal blades, an air inlet, an air inlet pipe, an air outlet, and an air outlet pipe; the fan housing is fixedly connected to the ground through a support frame; the axis of the motor's rotating shaft is arranged horizontally, the rotating shaft of the motor passes through the fan housing and extends into the fan housing, the motor is fixedly connected to the fan housing, and the motor is electrically connected to the controller; the heat-resistant shell is arranged outside the main body of the motor, is located outside the fan housing, and is fixedly connected to the fan housing; the centrifugal blades are arranged in the fan housing, the axis of the centrifugal blades coincides with the axis of the motor's rotating shaft, and the centrifugal blades are fixedly connected to the motor's rotating shaft; the inlet The air outlet is arranged at the side of the fan housing along the axial direction of the centrifugal fan blades and away from the motor. The air inlet is connected to the fan housing, and a first filter is arranged in the air inlet. The cross-section of the air inlet pipe is rectangular. The air inlet pipe is arranged on the side of the fan housing, one end of which is connected to the air inlet, and the other end is inclined downward. The axis of the air inlet pipe intersects with the axis of the centrifugal fan and is in the same vertical plane as the axis of the centrifugal fan. The air outlet is arranged at the top of the fan housing and is directly above the centrifugal fan blades. The air outlet is connected to the inside of the fan housing. The air outlet pipe is vertically arranged above the fan housing, and the lower end is connected to the air outlet.

[0008] When it is necessary to blow air into the boiler, the staff controls the motor to start through the controller, the motor drives the centrifugal fan blades to rotate, and the centrifugal fan blades drive the outside air to pass through the air inlet pipe, the first filter, the air inlet, the fan housing, the centrifugal fan blades, the air outlet, and the air outlet pipe in sequence into the boiler for blowing air.

[0009] Furthermore, the heat dissipation device includes a heat dissipation pool, a water pump, a first heat dissipation pipe, a plurality of heat dissipation channels, a second heat dissipation pipe, a radiator, a rotating plate, a variable flow structure, a third heat dissipation pipe, a two-way nozzle, and a fourth heat dissipation pipe; the heat dissipation pool is arranged outdoors; the water pump is arranged in the heat dissipation pool, the water pump is electrically connected to the controller, and a second filter is arranged at the water inlet of the water pump; one end of the first heat dissipation pipe is connected to the water outlet of the water pump; a plurality of heat dissipation channels are arranged in the heat-resistant shell and are arranged around the main body of the motor, and one end of the plurality of heat dissipation channels is connected to the other end of the first heat dissipation pipe; the water inlet of the second heat dissipation pipe is connected to the other end of the plurality of heat dissipation channels; the radiator is arranged in the air inlet pipe and is fixedly connected to the air inlet pipe; the rotating plate is perpendicular to the axis of the air inlet pipe, and the rotating plate The moving plate is arranged at one end of the air inlet pipe away from the air inlet, the upper part of the rotating plate is rotatably connected to the end of the air inlet pipe through a rotating shaft, and its rotating axis is arranged horizontally and perpendicular to the axis of the centrifugal fan; the variable flow structure is arranged in the air inlet pipe and is located between the rotating plate and the radiator, the variable flow structure is connected to the rotating plate, and is connected to the water outlet of the second heat dissipation pipe; the third heat dissipation pipe is reciprocating U-shaped, fixed on the radiator, and the water inlet of the third heat dissipation pipe is connected to the variable flow structure; the two-way nozzle is arranged between the radiator and the first filter, and is located in the air inlet pipe, the two-way nozzle faces the radiator and the first filter respectively, and the two-way nozzle is connected to the variable flow structure; one end of the fourth heat dissipation pipe is connected to the water outlet of the third heat dissipation pipe, and the other end is in the heat dissipation pool.

[0010] The centrifugal fan blades drive the outside air to enter the boiler through the rotating plate, the air inlet pipe, the radiator, the third heat pipe, the first filter, the air inlet, the fan housing, the centrifugal fan blades, the air outlet, and the air outlet pipe for blowing. The rotating plate, the radiator, and the first filter perform multiple filtrations on impurities in the airflow. The airflow drives the rotating plate to rotate, and the rotating plate drives the variable flow structure to start, so that the connecting port connects the second heat pipe and the third heat pipe.

[0011] The controller starts the water pump, and the water pump drives the water in the heat sink to pass through the water pump, the second filter, the first heat pipe, several heat dissipation channels, the second heat pipe, the Y-shaped pipe, the converter block, the connecting port, the third heat pipe, the radiator, and the fourth heat pipe and return to the heat sink. The water flow dissipates heat to the heat-resistant shell and the motor. The water flow heated by the motor heats the passing air flow at the third heat pipe and the radiator, thereby preheating the air flow and improving the combustion effect of the boiler.

[0012] Furthermore, the variable flow structure includes a Y-shaped tube, a variable flow block, a connecting port, a sliding port, a variable flow rod, and a first connecting rod; the Y-shaped tube is transversely arranged in the air inlet tube, between the rotating plate and the radiator, the Y-shaped tube is fixedly connected to the air inlet tube, the water inlet end of the Y-shaped tube is connected to the water outlet of the second radiating tube, and the two water outlet ends are respectively connected to the water inlet of the third radiating tube and the two-way nozzle; the variable flow block is a cylindrical rubber, the axis of which is parallel to the axis of the rotating plate, and is arranged in the water inlet end of the Y-shaped tube, at the intersection of the Y-shaped tube, and cooperates with the Y-shaped tube; the connecting port is a through port, and is set It is placed on the converter block, and its two ends are respectively connected to the water inlet end and the water outlet end of the Y-tube, so as to connect the second heat dissipation tube and the two-way nozzle; the sliding port is a semi-arc-shaped port, which is arranged on the surface of the Y-tube and corresponds to the converter block; the converter rod is arranged along the radial direction of the converter block, one end of which is fixedly connected to the converter block, and the converter rod is slidably connected to the sliding port; the first connecting rod is arranged in the air inlet pipe, between the rotating plate and the Y-tube, one end of which is hinged to the rotating plate, and the other end is hinged to the other end of the converter rod, and the hinge axis of the first connecting rod is parallel to the rotating axis of the rotating plate.

[0013] The airflow drives the rotating plate to rotate, the rotating plate drives the flow-changing rod to rotate through the first connecting rod, the flow-changing rod drives the flow-changing block to rotate, and the flow-changing block drives the connecting port to rotate, so that the connecting port connects the second heat dissipation pipe and the third heat dissipation pipe.

[0014] Furthermore, the heat dissipation device includes a temperature sensor, which is arranged on the heat-resistant shell and is electrically connected to the controller.

[0015] When the temperature sensor detects that the temperature of the motor is higher than the set threshold range, the controller controls the water pump to start, and the water pump drives the water in the heat sink to pass through the water pump, the second filter, the first heat pipe, several heat dissipation channels, the second heat pipe, the Y-shaped pipe, the converter block, the connecting port, the third heat pipe, the radiator, and the fourth heat pipe back to the heat sink. The water flow dissipates heat from the heat-resistant shell and the motor. The water flow heated by the motor heats the passing airflow at the third heat pipe and the radiator, thereby preheating the airflow and improving the combustion effect of the boiler.

[0016] Furthermore, the heat dissipation device includes a valve; the valve is arranged at the bottom of the fan housing.

[0017] Furthermore, the heat dissipation device includes a water collecting tank, which is located directly below the valve and the air inlet pipe.

[0018] The water entering the fan housing through the first filter screen can clean the inside of the fan housing, and then fall into the water collection tank by opening the valve.

[0019] Furthermore, the anti-backflow device includes a fireproof plate, a second connecting rod, and a third connecting rod; the fireproof plate horizontally penetrates the air outlet duct to close the air outlet duct, and the sliding direction of the fireproof plate is parallel to the axis of the centrifugal fan; the second connecting rod is arranged above the rotating plate, and its lower end is fixedly connected to the upper end of the rotating plate; one end of the third connecting rod is hinged to the upper end of the second connecting rod, and the other end is hinged to the fireproof plate, and the hinge axis of the third connecting rod is parallel to the rotation axis of the rotating plate.

[0020] The airflow drives the rotating plate to rotate, the rotating plate drives the second connecting rod to rotate, the second connecting rod drives the fireproof plate to move away from the motor through the third connecting rod, and the air outlet duct is opened.

[0021] Furthermore, the anti-backflow device includes a return spring; the return spring is obliquely arranged above the air inlet pipe, the lower end of which is fixedly connected to the air inlet pipe, and the upper end of which is fixedly connected to the upper part of the second connecting rod.

[0022] When the boiler does not need to be blasted, the staff controls the motor to be turned off through the controller. Under the action of the reset spring, the second linkage rod and the rotating plate rotate in the opposite direction, so that the rotating plate blocks the air inlet pipe, and the rotating plate drives the first linkage rod and the flow change rod to rotate in the opposite direction, and the flow change rod drives the flow change block to rotate in the opposite direction, and the flow change block drives the connecting port to rotate in the opposite direction, so that the connecting port connects the second heat dissipation pipe and the two-way nozzle. At this time, the temperature sensor detects that the temperature of the motor is still higher than the set threshold range. Under the action of the water pump, the water pump drives the water in the heat dissipation pool to pass through the water pump, the second filter, the first heat dissipation pipe, several heat dissipation channels, the second heat dissipation pipe, the Y-type pipe, the flow change block, the connecting port, and the two-way nozzle to spray out, and then clean the radiator and the first filter respectively. The sewage in the air inlet pipe can flow out through the gap between the rotating plate and the inner surface of the air inlet pipe and fall into the water collection pool, and at this time, the rotating plate can block the splashing water flow and make it fall into the water collection pool until the temperature sensor detects that the temperature of the motor is within the set threshold range, and the controller controls the water pump to be turned off.

[0023] Furthermore, the backflow prevention device includes two support plates, a rotating rod, a gear ring, a gear, an external thread, a linkage ring, and a limit ring; the two support plates are arranged inside the fan housing, directly above the centrifugal fan, the two support plates are fixedly connected to the inner top surface of the fan housing, the two support plates are arranged at intervals along the sliding direction of the fireproof plate, and are located on both sides of the air outlet; the rotating rod is cylindrical, parallel to the sliding direction of the fireproof plate, horizontally passes through the two support plates, and is slidably connected to the two support plates; the gear ring is coaxially sleeved outside the centrifugal blades and fixedly connected to the centrifugal blades; the gear is coaxially sleeved outside the rotating rod, between the two support plates, and fixedly connected to the rotating rod, and the gear is close to the electric The outer thread is arranged on the surface of the rotating rod, and is on the side where the gear is away from the motor; the connecting ring is arranged outside the rotating rod, and is on the side where the gear is away from the motor, and is directly below the fireproof plate; the connecting ring is fixedly connected to the side of the fireproof plate close to the motor and is in contact with the gear; the inner surface of the connecting ring is provided with a thread groove, and the thread groove is threadedly connected to the outer thread; the limiting ring is arranged outside the rotating rod, and is between the two supporting plates, and is on the side where the outer thread is away from the motor; the limiting ring is fixedly connected to the rotating rod, and the distance between the limiting ring and the outer thread is greater than the width of the connecting ring, and the distance between the limiting ring and the supporting plate away from the motor is greater than the lateral width of the gear ring.

[0024] The rotation of the centrifugal fan blades drives the gear ring to rotate, and the gear ring drives the gear, the rotating rod, and the limit ring to rotate. The rotating rod drives the linkage ring to move away from the motor through the external thread until the linkage ring is detached from the external thread. The linkage ring drives the fireproof plate to move to open a small gap in the air inlet pipe. The fireproof plate drives the second linkage rod, the third linkage rod, and the rotating plate to rotate. The centrifugal fan blades drive the fireproof plate to move to open the air outlet pipe, and drive the rotating plate to rotate to open a small gap in the air inlet pipe to prevent the fireproof plate and the rotating plate from closing the fan housing, causing the centrifugal fan blades to be unable to generate airflow.

[0025] The airflow drives the rotating plate to rotate, the rotating plate drives the second connecting rod to rotate, the second connecting rod drives the fireproof plate to move away from the motor through the third connecting rod, the fireproof plate drives the connecting ring to move, the connecting ring slides on the rotating rod for a distance and then contacts the limit ring, and then pushes the limit ring, the rotating rod, and the gear to move away from the motor until the gear is disengaged from the gear ring, thereby keeping the rotating plate and the fireproof plate open and the second heat dissipation pipe connected to the third heat dissipation pipe through the airflow, and at the same time, the gear is disengaged from the gear ring, thereby reducing the rotation loss of the centrifugal fan blades.

[0026] The second linkage rod rotates in the opposite direction to drive the fireproof plate to move closer to the motor through the third linkage rod, and the fireproof plate drives the linkage ring to move. The linkage ring slides on the rotating rod for a distance and contacts the external thread. Then, the external thread drives the limit ring, the rotating rod, and the gear to move closer to the motor and rotate, so that the gear and the gear ring are meshed until the gear contacts the support plate and the linkage ring contacts the gear, thereby achieving reset. Closing the air outlet pipe with the fireproof plate can prevent the fire in the boiler from flowing back into the fan housing and damaging the centrifugal fan blades. In addition, when the high-temperature resistant fan is idle, the fireproof plate and the rotating plate can also prevent external impurities from entering the fan housing. Beneficial effects of the present invention: 1. When the motor is accidentally powered off, the air outlet pipe can be automatically closed through the fireproof plate, which can prevent the fire in the boiler from flowing back into the fan casing and causing damage to the centrifugal fan blades.

[0027] 2. The centrifugal fan blades drive the gear ring to rotate, and the gear ring drives the gear, rotating rod, and limit ring to rotate. The rotating rod drives the linkage ring to move away from the motor through the external thread until the linkage ring is detached from the external thread. The linkage ring drives the fireproof plate to move to open a small gap in the air inlet pipe. The fireproof plate drives the second linkage rod, the third linkage rod, and the rotating plate to rotate. The centrifugal fan blades drive the fireproof plate to move to open the air outlet pipe, and drive the rotating plate to rotate to open a small gap in the air inlet pipe to prevent the fireproof plate and the rotating plate from closing the fan housing, causing the centrifugal fan blades to be unable to generate airflow.

[0028] 3. When there is no need to blow air to the boiler, the staff controls the motor to turn off through the controller. Under the action of the reset spring, the second connecting rod and the rotating plate rotate in the opposite direction, so that the rotating plate blocks the air inlet pipe, and the rotating plate drives the first connecting rod and the flow changing rod to rotate in the opposite direction. The flow changing rod drives the flow changing block to rotate in the opposite direction, and the flow changing block drives the connecting port to rotate in the opposite direction, so that the connecting port connects the second heat dissipation pipe and the two-way nozzle. At this time, the temperature sensor detects that the temperature of the motor is still higher than the set threshold range. Under the action of the water pump, the water pump drives the water in the heat dissipation pool to pass through the water pump, the second filter, the first heat dissipation pipe, several heat dissipation channels, the second heat dissipation pipe, the Y-tube, the flow changing block, the connecting port, and the two-way nozzle to spray out, and then the radiator and the first filter are cleaned respectively. The water entering the fan housing through the first filter can clean the inside of the fan housing, and then falls into the water collection pool by opening the valve. The sewage in the air inlet pipe can flow out through the gap between the rotating plate and the inner surface of the air inlet pipe and fall into the collecting tank. At this time, the rotating plate can block the splashing water flow and make it fall into the collecting tank until the temperature sensor detects that the temperature of the motor is within the set threshold range, and the controller controls the water pump to shut down. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1This is a schematic diagram of the overall structure of the high temperature resistant fan for industrial boilers.

[0030] Explanation of the accompanying drawings: 1. Fan housing; 11. Valve; 2. Heat-resistant shell; 21. Heat dissipation channel; 22. Motor; 23. Centrifugal fan blades; 24. Ring gear; 3. Air outlet pipe; 31. Support plate; 32. Gear; 33. Linking ring; 34. Rotating rod; 35. Limiting ring; 36. Fireproof plate; 4. Air inlet pipe; 41. First filter; 42. Two-way nozzle; 43. Radiator; 44. Y-type tube; 45. First linking rod; 46. Rotating plate; 47. Second linking rod; 48. Return spring; 49. Third linking rod; 5. Water collecting tank. DETAILED DESCRIPTION

[0031] The concept and technical effects of the present invention will be clearly and completely described below in conjunction with embodiments to fully understand the purpose, features and effects of the present invention.

[0032] like Figure 1 As shown, a high-temperature resistant fan for an industrial boiler includes: an air blowing device, a heat dissipation device, an anti-backflow device, and a controller; the air blowing device is arranged on the ground; the heat dissipation device is connected to the air blowing device for dissipating heat from the air blowing device; the anti-backflow device is arranged on the air blowing device for preventing the backflow of boiler fire; the controller is electrically connected to the air blowing device and the heat dissipation device.

[0033] When it is necessary to blow air to the industrial boiler, the staff controls the blower to open through the controller, and the blower blows air to the industrial boiler. The heat dissipation device is used to dissipate heat and protect the blower. When it is not necessary to blow air to the industrial boiler, the staff controls the blower to close through the controller, and the anti-backflow device can prevent the fire in the industrial boiler from backflowing into the blower, thereby protecting the staff and the blower.

[0034] The blowing device includes a fan housing 1, a motor 22, a heat-resistant shell 2, a centrifugal fan blade 23, an air inlet, an air inlet pipe 4, an air outlet, and an air outlet pipe 3; the fan housing 1 is fixedly connected to the ground through a support frame; the axis of the rotating shaft of the motor 22 is arranged horizontally, the rotating shaft of the motor 22 passes through the fan housing 1 and extends into the fan housing 1, the motor 22 is fixedly connected to the fan housing 1, and the motor 22 is electrically connected to the controller; the heat-resistant shell 2 is arranged outside the main body of the motor 22, is located outside the fan housing 1, and is fixedly connected to the fan housing 1; the centrifugal fan blade 23 is arranged in the fan housing 1, and its axis coincides with the axis of the rotating shaft of the motor 22, and the centrifugal fan blade 23 and the rotating shaft of the motor 22 Fixed connection; the air inlet is arranged at the side of the fan housing 1 along the axial direction of the centrifugal blades 23 and away from the motor 22, the air inlet is connected to the fan housing 1, and a first filter 41 is arranged in the air inlet; the cross-section of the air inlet pipe 4 is rectangular, the air inlet pipe 4 is arranged on the side of the fan housing 1, one end of which is connected to the air inlet, and the other end is inclined downward, the axis of the air inlet pipe 4 intersects with the axis of the centrifugal fan, and is in the same vertical plane as the axis of the centrifugal fan; the air outlet is arranged at the top of the fan housing 1, and is directly above the centrifugal blades 23, and the air outlet is connected to the inside of the fan housing 1; the air outlet pipe 3 is vertically arranged above the fan housing 1, and the lower end is connected to the air outlet.

[0035] When it is necessary to blow air into the boiler, the staff controls the motor 22 to start through the controller, the motor 22 drives the centrifugal blades 23 to rotate, and the centrifugal blades 23 drive the outside air to pass through the air inlet pipe 4, the first filter 41, the air inlet, the fan housing 1, the centrifugal blades 23, the air outlet, and the air outlet pipe 3 in sequence into the boiler for blowing air.

[0036] The heat dissipation device includes a heat dissipation pool, a water pump, a first heat dissipation pipe, a plurality of heat dissipation channels 21, a second heat dissipation pipe, a radiator 43, a rotating plate 46, a variable flow structure, a third heat dissipation pipe, a two-way nozzle 42, and a fourth heat dissipation pipe; the heat dissipation pool is arranged outdoors; the water pump is arranged in the heat dissipation pool, the water pump is electrically connected to the controller, and a second filter is arranged at the water inlet of the water pump; one end of the first heat dissipation pipe is connected to the water outlet of the water pump; a plurality of heat dissipation channels 21 are arranged in the heat-resistant shell 2 and are arranged around the main body of the motor 22, and one end of the plurality of heat dissipation channels 21 is connected to the other end of the first heat dissipation pipe; the water inlet of the second heat dissipation pipe is connected to the other end of the plurality of heat dissipation channels 21; the radiator 43 is arranged in the air inlet pipe 4 and is fixedly connected to the air inlet pipe 4; the rotating plate 46 is perpendicular to the axis of the air inlet pipe 4, and the rotating plate 46 is arranged It is placed at one end of the air inlet pipe 4 away from the air inlet, and the upper part of the rotating plate 46 is rotatably connected to the end of the air inlet pipe 4 through a rotating shaft, and its rotating axis is arranged horizontally and perpendicular to the axis of the centrifugal fan; the variable flow structure is arranged in the air inlet pipe 4, and is located between the rotating plate 46 and the radiator 43, the variable flow structure is connected to the rotating plate 46, and is communicated with the water outlet of the second heat dissipation pipe; the third heat dissipation pipe is reciprocating U-shaped, fixed on the radiator 43, and the water inlet of the third heat dissipation pipe is communicated with the variable flow structure; the two-way nozzle 42 is arranged between the radiator 43 and the first filter 41, and is located in the air inlet pipe 4, the two-way nozzle 42 faces the radiator 43 and the first filter 41 respectively, and the two-way nozzle 42 is communicated with the variable flow structure; one end of the fourth heat dissipation pipe is communicated with the water outlet of the third heat dissipation pipe, and the other end is in the heat dissipation pool.

[0037] The centrifugal blades 23 drive the outside air to enter the boiler through the rotating plate 46, the air inlet pipe 4, the radiator 43, the third heat pipe, the first filter 41, the air inlet, the fan housing 1, the centrifugal blades 23, the air outlet, and the air outlet pipe 3 for blowing. The rotating plate 46, the radiator 43, and the first filter 41 perform multiple filtrations on impurities in the airflow. The airflow drives the rotating plate 46 to rotate, and the rotating plate 46 drives the variable flow structure to start, so that the connecting port connects the second heat pipe and the third heat pipe.

[0038] The controller controls the water pump to start, and the water pump drives the water in the heat sink to pass through the water pump, the second filter, the first heat dissipation pipe, the plurality of heat dissipation channels 21, the second heat dissipation pipe, the Y-shaped pipe 44, the converter block, the connecting port, the third heat dissipation pipe, the radiator 43, and the fourth heat dissipation pipe and return to the heat sink. The water flow dissipates heat from the heat-resistant shell 2 and the motor 22. The water flow heated by the motor 22 heats the passing airflow at the third heat dissipation pipe and the radiator 43, thereby preheating the airflow and improving the combustion effect of the boiler.

[0039] The variable flow structure includes a Y-shaped tube 44, a variable flow block, a connecting port, a sliding port, a variable flow rod, and a first connecting rod 45; the Y-shaped tube 44 is transversely arranged in the air inlet tube 4, between the rotating plate 46 and the radiator 43, the Y-shaped tube 44 is fixedly connected to the air inlet tube 4, the water inlet end of the Y-shaped tube 44 is connected to the water outlet of the second radiating tube, and the two water outlet ends are respectively connected to the water inlet of the third radiating tube and the two-way nozzle 42; the variable flow block is a cylindrical rubber, the axis of which is parallel to the axis of the rotating plate 46, and is arranged in the water inlet end of the Y-shaped tube 44, at the intersection of the Y-shaped tube 44, and cooperates with the Y-shaped tube 44; the connecting port is a through port, It is arranged on the flow-changing block, and its two ends are respectively connected with the water inlet end and the water outlet end of the Y-shaped tube 44, so as to connect the second heat dissipation tube and the two-way nozzle 42; the sliding port is a semi-arc-shaped port, which is arranged on the surface of the Y-shaped tube 44 and corresponds to the flow-changing block; the flow-changing rod is arranged along the radial direction of the flow-changing block, and one end of it is fixedly connected with the flow-changing block, and the flow-changing rod is slidably connected with the sliding port; the first linkage rod 45 is arranged in the air inlet pipe 4, between the rotating plate 46 and the Y-shaped tube 44, and one end of it is hinged with the rotating plate 46, and the other end is hinged with the other end of the flow-changing rod, and the hinge axis of the first linkage rod 45 is parallel to the rotating axis of the rotating plate 46. The flow-changing block cooperates with the Y-shaped tube 44, so that the water inlet end and the two water outlet ends of the Y-shaped tube 44 can be adjusted.

[0040] The airflow drives the rotating plate 46 to rotate, and the rotating plate 46 drives the flow-changing rod to rotate through the first connecting rod 45, and the flow-changing rod drives the flow-changing block to rotate, and the flow-changing block drives the connecting port to rotate, so that the connecting port connects the second heat dissipation pipe and the third heat dissipation pipe.

[0041] The heat dissipation device includes a temperature sensor, which is disposed on the heat-resistant shell 2 and is electrically connected to the controller.

[0042] When the temperature sensor detects that the temperature of the motor 22 is higher than the set threshold range, the controller controls the water pump to start, and the water pump drives the water in the heat sink to pass through the water pump, the second filter, the first heat dissipation pipe, the plurality of heat dissipation channels 21, the second heat dissipation pipe, the Y-shaped pipe 44, the converter block, the connecting port, the third heat dissipation pipe, the radiator 43, and the fourth heat dissipation pipe back to the heat sink. The water flow dissipates heat from the heat-resistant shell 2 and the motor 22. The water flow heated by the motor 22 heats the passing airflow at the third heat dissipation pipe and the radiator 43, thereby preheating the airflow and improving the combustion effect of the boiler.

[0043] The heat dissipation device comprises a valve 11 ; the valve 11 is arranged at the bottom of the fan housing 1 .

[0044] The heat dissipation device includes a water collecting tank 5 , which is located directly below the valve 11 and the air inlet pipe 4 .

[0045] The water entering the fan housing 1 through the first filter screen 41 can clean the inside of the fan housing 1 and then fall into the water collection tank 5 by opening the valve 11 .

[0046] The anti-backflow device includes a fireproof plate 36, a second connecting rod 47, and a third connecting rod 49; the fireproof plate 36 horizontally penetrates the air outlet duct 3 to close the air outlet duct 3, and the sliding direction of the fireproof plate 36 is parallel to the axis of the centrifugal fan; the second connecting rod 47 is arranged above the rotating plate 46, and its lower end is fixedly connected to the upper part of the rotating plate 46; one end of the third connecting rod 49 is hinged to the upper end of the second connecting rod 47, and the other end is hinged to the fireproof plate 36, and the hinge axis of the third connecting rod 49 is parallel to the rotation axis of the rotating plate 46.

[0047] The airflow drives the rotating plate 46 to rotate, and the rotating plate 46 drives the second connecting rod 47 to rotate. The second connecting rod 47 drives the fireproof plate 36 to move away from the motor 22 through the third connecting rod 49, so as to open the air outlet 3.

[0048] The anti-backflow device includes a return spring 48 ; the return spring 48 is obliquely arranged above the air inlet pipe 4 , with its lower end fixedly connected to the air inlet pipe 4 , and its upper end fixedly connected to the upper part of the second linkage rod 47 .

[0049] When there is no need to blow air to the boiler, the staff controls the motor 22 to turn off through the controller. Under the action of the reset spring 48, the second connecting rod 47 and the rotating plate 46 rotate in the opposite direction, so that the rotating plate 46 blocks the air inlet pipe 4, and the rotating plate 46 drives the first connecting rod 45 and the flow change rod to rotate in the opposite direction. The flow change rod drives the flow change block to rotate in the opposite direction, and the flow change block drives the connecting port to rotate in the opposite direction, so that the connecting port connects the second heat dissipation pipe and the two-way nozzle 42. At this time, the temperature sensor detects that the temperature of the motor 22 is still higher than the set threshold range. Under the action of the water pump, the water pump drives the water in the heat dissipation pool to pass through the water pump, the second filter, the first heat dissipation pipe, several heat dissipation channels 21, the second heat dissipation pipe, the Y-tube 44, the flow change block, the connecting port, and the two-way nozzle 42 in sequence to spray out, and then clean the radiator 43 and the first filter 41 respectively. The sewage in the air inlet pipe 4 can flow out through the gap between the rotating plate 46 and the inner surface of the air inlet pipe 4 and fall into the water collecting tank 5. At this time, the rotating plate 46 can block the splashing water flow and make it fall into the water collecting tank 5 until the temperature sensor detects that the temperature of the motor 22 is within the set threshold range, and the controller controls the water pump to turn off.

[0050] The anti-backflow device includes two support plates 31, a rotating rod 34, a gear ring 24, a gear 32, an external thread, a linkage ring 33, and a limit ring 35; the two support plates 31 are arranged inside the fan housing 1, just above the centrifugal fan, and the two support plates 31 are fixedly connected to the inner top surface of the fan housing 1. The two support plates 31 are arranged at intervals along the sliding direction of the fireproof plate 36 and are located on both sides of the air outlet; the rotating rod 34 is cylindrical, parallel to the sliding direction of the fireproof plate 36, horizontally penetrates the two support plates 31, and is slidably connected to the two support plates 31; the gear ring 24 is coaxially sleeved outside the centrifugal blades 23 and fixedly connected to the centrifugal blades 23; the gear 32 is coaxially sleeved outside the rotating rod 34, between the two support plates 31, and fixedly connected to the rotating rod 34, and the gear 32 is connected to the support plate close to the motor 22 31 is in contact with and meshes with the ring gear 24; the external thread is arranged on the surface of the rotating rod 34, and is on the side where the gear 32 is away from the motor 22; the interlocking ring 33 is sleeved on the outside of the rotating rod 34, and is on the side where the gear 32 is away from the motor 22, and is directly below the fireproof plate 36. The interlocking ring 33 is fixedly connected to the side of the fireproof plate 36 close to the motor 22 and is in contact with the gear 32. The inner surface of the interlocking ring 33 is provided with a thread groove, and the thread groove is threadedly connected to the external thread; the limiting ring 35 is sleeved on the outside of the rotating rod 34, and is between the two support plates 31, and is on the side where the external thread is away from the motor 22. The limiting ring 35 is fixedly connected to the rotating rod 34, and the distance between the limiting ring 35 and the external thread is greater than the width of the interlocking ring 33, and the distance between the limiting ring 35 and the support plate 31 away from the motor 22 is greater than the lateral width of the ring gear 24.

[0051] The centrifugal blade 23 rotates to drive the gear ring 24 to rotate, and the gear ring 24 drives the gear 32, the rotating rod 34, and the limit ring 35 to rotate. The rotating rod 34 drives the interlocking ring 33 to move away from the motor 22 through the external thread until the interlocking ring 33 is separated from the external thread. The interlocking ring 33 drives the fireproof plate 36 to move to open a small gap in the air inlet pipe 4, and the fireproof plate 36 drives the second interlocking rod 47, the third interlocking rod 49, and the rotating plate 46 to rotate. The centrifugal blade 23 drives the fireproof plate 36 to move to open the air outlet pipe 3, and drives the rotating plate 46 to rotate to open the air inlet pipe 4 to open a small gap, so as to prevent the fireproof plate 36 and the rotating plate 46 from closing the fan housing 1, so that the centrifugal blade 23 cannot generate airflow.

[0052] The airflow drives the rotating plate 46 to rotate, and the rotating plate 46 drives the second connecting rod 47 to rotate. The second connecting rod 47 drives the fireproof plate 36 to move away from the motor 22 through the third connecting rod 49. The fireproof plate 36 drives the connecting ring 33 to move. The connecting ring 33 slides on the rotating rod 34 for a distance and then contacts the limit ring 35, and then pushes the limit ring 35, the rotating rod 34, and the gear 32 to move away from the motor 22 until the gear 32 is disengaged from the ring gear 24. While the rotating plate 46 and the fireproof plate 36 are kept open by the airflow and the second heat dissipation pipe is connected to the third heat dissipation pipe, the gear 32 is disengaged from the ring gear 24, thereby reducing the rotation loss of the centrifugal fan blades 23.

[0053] The second linkage rod 47 rotates in the opposite direction to drive the fireproof plate 36 to move toward the direction close to the motor 22 through the third linkage rod 49, and the fireproof plate 36 drives the linkage ring 33 to move. The linkage ring 33 slides on the rotating rod 34 for a distance and contacts the external thread, and then drives the limit ring 35, the rotating rod 34, and the gear 32 to move toward the direction close to the motor 22 and rotate through the external thread, so that the gear 32 is meshed with the gear ring 24 until the gear 32 contacts the support plate 31 and the linkage ring 33 contacts the gear 32, thereby achieving reset. The air outlet pipe 3 is closed by the fireproof plate 36, which can prevent the fire in the boiler from flowing back into the fan housing 1 and damaging the centrifugal blades 23. In addition, when the high-temperature resistant fan is idle, the fireproof plate 36 and the rotating plate 46 can also prevent external impurities from entering the fan housing 1.

[0054] Working principle: When the boiler needs to be blasted, the staff controls the motor 22 to start through the controller, the motor 22 drives the centrifugal blades 23 to rotate, the centrifugal blades 23 drives the gear ring 24 to rotate, the gear ring 24 drives the gear 32, the rotating rod 34, and the limit ring 35 to rotate, the rotating rod 34 drives the interlocking ring 33 to move away from the motor 22 through the external thread, until the interlocking ring 33 is separated from the external thread, the interlocking ring 33 drives the fireproof plate 36 to move to open a small gap in the air inlet pipe 4, and the fireproof plate 36 drives the second interlocking rod 47, the third interlocking rod 49, and the rotating plate 46 to rotate. The centrifugal blades 23 drive the fireproof plate 36 to move to open the air outlet pipe 3, and drive the rotating plate 46 to rotate to open the air inlet pipe 4 to open a small gap, so as to prevent the fireproof plate 36 and the rotating plate 46 from closing the fan housing 1, so that the centrifugal blades 23 cannot generate airflow.

[0055] At the same time, the centrifugal blades 23 drive the outside air to pass through the rotating plate 46, the air inlet pipe 4, the radiator 43, the third heat pipe, the first filter 41, the air inlet, the fan housing 1, the centrifugal blades 23, the air outlet, and the air outlet pipe 3 to enter the boiler for blowing. The rotating plate 46, the radiator 43, and the first filter 41 perform multiple filtrations on impurities in the airflow. The airflow drives the rotating plate 46 to rotate, the rotating plate 46 drives the second connecting rod 47 to rotate, the rotating plate 46 drives the flow change rod to rotate through the first connecting rod 45, the flow change rod drives the flow change block to rotate, and the flow change block drives the connecting port to rotate, so that the connecting port connects the second heat pipe and the third heat pipe.

[0056] The second connecting rod 47 drives the fireproof plate 36 to move away from the motor 22 through the third connecting rod 49, and the fireproof plate 36 drives the connecting ring 33 to move. The connecting ring 33 slides on the rotating rod 34 for a distance and then contacts the limit ring 35, and then pushes the limit ring 35, the rotating rod 34, and the gear 32 to move away from the motor 22 until the gear 32 is disengaged from the ring gear 24. In this way, while the rotating plate 46 and the fireproof plate 36 are kept open by the airflow and the second heat dissipation pipe is connected to the third heat dissipation pipe, the gear 32 is disengaged from the ring gear 24, thereby reducing the rotation loss of the centrifugal fan blades 23.

[0057] When the temperature sensor detects that the temperature of the motor 22 is higher than the set threshold range, the controller controls the water pump to start, and the water pump drives the water in the heat sink to pass through the water pump, the second filter, the first heat dissipation pipe, the plurality of heat dissipation channels 21, the second heat dissipation pipe, the Y-shaped pipe 44, the converter block, the connecting port, the third heat dissipation pipe, the radiator 43, and the fourth heat dissipation pipe back to the heat sink. The water flow dissipates heat from the heat-resistant shell 2 and the motor 22. The water flow heated by the motor 22 heats the passing airflow at the third heat dissipation pipe and the radiator 43, thereby preheating the airflow and improving the combustion effect of the boiler.

[0058] After the motor 22 is accidentally powered off, or when the boiler does not need to be blasted, the staff controls the motor 22 to be turned off through the controller. Under the action of the reset spring 48, the second connecting rod 47 and the rotating plate 46 rotate in the opposite direction, so that the rotating plate 46 blocks the air inlet pipe 4, and the rotating plate 46 drives the first connecting rod 45 and the flow change rod to rotate in the opposite direction, and the flow change rod drives the flow change block to rotate in the opposite direction, and the flow change block drives the connecting port to rotate in the opposite direction, so that the connecting port connects the second heat dissipation pipe and the two-way nozzle 42. At this time, the temperature sensor detects that the temperature of the motor 22 is still higher than the set threshold range. Under the action of the water pump, the water pump drives the water in the heat dissipation pool to pass through the water pump, the second filter, the first heat dissipation pipe, a plurality of heat dissipation channels 21, the second heat dissipation pipe, the Y-shaped tube 44, the flow change block, the connecting port, and the two-way nozzle 42 in sequence to spray out, and then clean the radiator 43 and the first filter 41 respectively. The water entering the fan housing 1 through the first filter 41 can clean the inside of the fan housing 1, and then falls into the water collection pool 5 by opening the valve 11. The sewage in the air inlet pipe 4 can flow out through the gap between the rotating plate 46 and the inner surface of the air inlet pipe 4 and fall into the water collecting tank 5. At this time, the rotating plate 46 can block the splashing water flow and make it fall into the water collecting tank 5 until the temperature sensor detects that the temperature of the motor 22 is within the set threshold range, and the controller controls the water pump to turn off.

[0059] The second linkage rod 47 rotates in the opposite direction to drive the fireproof plate 36 to move toward the direction close to the motor 22 through the third linkage rod 49, and the fireproof plate 36 drives the linkage ring 33 to move. The linkage ring 33 slides on the rotating rod 34 for a distance and contacts the external thread, and then drives the limit ring 35, the rotating rod 34, and the gear 32 to move toward the direction close to the motor 22 and rotate through the external thread, so that the gear 32 is meshed with the gear ring 24 until the gear 32 contacts the support plate 31 and the linkage ring 33 contacts the gear 32, thereby achieving reset. The air outlet pipe 3 is closed by the fireproof plate 36, which can prevent the fire in the boiler from flowing back into the fan housing 1 and damaging the centrifugal blades 23. In addition, when the high-temperature resistant fan is idle, the fireproof plate 36 and the rotating plate 46 can also prevent external impurities from entering the fan housing 1.

[0060] The above embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work shall all fall within the scope of protection of the present invention.

Claims

1. A high temperature resistant fan for industrial boilers, characterized in that: include: An air blowing device, a heat dissipation device, an anti-backflow device, and a controller; the air blowing device is arranged on the ground; the heat dissipation device is connected to the air blowing device and is used to dissipate heat from the air blowing device; the anti-backflow device is arranged on the air blowing device and is used to prevent the backflow of boiler fire; the controller is electrically connected to the air blowing device and the heat dissipation device.

2. A high temperature resistant fan for industrial boilers according to claim 1, characterized in that: The air blowing device comprises a fan housing (1), a motor (22), a heat-resistant shell (2), centrifugal blades (23), an air inlet, an air inlet pipe (4), an air outlet, and an air outlet pipe (3); the fan housing (1) is fixedly connected to the ground via a support frame; the axis of the rotating shaft of the motor (22) is arranged horizontally, the rotating shaft of the motor (22) passes through the fan housing (1) and extends into the fan housing (1), the motor (22) is fixedly connected to the fan housing (1), and the motor (22) is electrically connected to the controller; the heat-resistant shell (2) is arranged outside the main body of the motor (22), is located outside the fan housing (1), and is fixedly connected to the fan housing (1); the centrifugal blades (23) are arranged in the fan housing (1), the axis of the centrifugal blades (23) coincides with the axis of the rotating shaft of the motor (22), and the centrifugal blades (23) are electrically connected to the motor ( 22); the air inlet is arranged at the side of the fan housing (1) along the axial direction of the centrifugal blades (23) and away from the motor (22); the air inlet is connected to the fan housing (1), and a first filter (41) is arranged in the air inlet; the cross-section of the air inlet pipe (4) is rectangular, the air inlet pipe (4) is arranged on the side of the fan housing (1), one end of the air inlet pipe (4) is connected to the air inlet, and the other end is inclined downward, the axis of the air inlet pipe (4) intersects with the axis of the centrifugal fan, and is in the same vertical plane as the axis of the centrifugal fan; the air outlet is arranged at the top of the fan housing (1) and is directly above the centrifugal blades (23); the air outlet is connected to the inside of the fan housing (1); the air outlet pipe (3) is vertically arranged above the fan housing (1), and the lower end is connected to the air outlet.

3. A high temperature resistant fan for industrial boilers according to claim 2, characterized in that: The heat dissipation device comprises a heat dissipation pool, a water pump, a first heat dissipation pipe, a plurality of heat dissipation channels (21), a second heat dissipation pipe, a radiator (43), a rotating plate (46), a variable flow structure, a third heat dissipation pipe, a two-way nozzle (42), and a fourth heat dissipation pipe; the heat dissipation pool is arranged outdoors; the water pump is arranged in the heat dissipation pool, the water pump is electrically connected to the controller, and a second filter screen is arranged at the water inlet of the water pump; one end of the first heat dissipation pipe is communicated with the water outlet of the water pump; a plurality of heat dissipation channels (21) are arranged in the heat-resistant shell (2) and are arranged around the main body of the motor (22); one end of the plurality of heat dissipation channels (21) is communicated with the other end of the first heat dissipation pipe; the water inlet of the second heat dissipation pipe is communicated with the other end of the plurality of heat dissipation channels (21); the radiator (43) is arranged in the air inlet pipe (4) and is fixedly connected to the air inlet pipe (4); the rotating plate (46) is perpendicular to the axis of the air inlet pipe (4), and the rotating plate (46) is arranged on the air inlet pipe. (4) at one end away from the air inlet, the upper part of the rotating plate (46) is rotatably connected to the end of the air inlet pipe (4) via a rotating shaft, and its rotating axis is arranged horizontally and perpendicular to the axis of the centrifugal fan; the variable flow structure is arranged in the air inlet pipe (4) and is located between the rotating plate (46) and the radiator (43); the variable flow structure is connected to the rotating plate (46) and is communicated with the water outlet of the second radiating pipe; the third radiating pipe is in a reciprocating U-shape and is fixed to the radiator The air inlet of the third heat dissipation pipe is connected to the variable flow structure; the bidirectional nozzle (42) is arranged between the radiator (43) and the first filter (41), and is located in the air inlet pipe (4); the bidirectional nozzle (42) faces the radiator (43) and the first filter (41), respectively, and is connected to the variable flow structure; one end of the fourth heat dissipation pipe is connected to the water outlet of the third heat dissipation pipe, and the other end is located in the heat dissipation pool.

4. A high temperature resistant fan for industrial boilers according to claim 3, characterized in that: The flow-changing structure comprises a Y-shaped tube (44), a flow-changing block, a connecting port, a sliding port, a flow-changing rod, and a first connecting rod (45); the Y-shaped tube (44) is transversely arranged in the air inlet tube (4), located between the rotating plate (46) and the radiator (43); the Y-shaped tube (44) is fixedly connected to the air inlet tube (4); the water inlet end of the Y-shaped tube (44) is connected to the water outlet of the second radiating tube; the two water outlet ends are respectively connected to the water inlet of the third radiating tube and the two-way nozzle (42); the flow-changing block is a cylindrical rubber, the axis of which is parallel to the axis of the rotating plate (46), and is arranged in the water inlet end of the Y-shaped tube (44), located at the intersection of the Y-shaped tube (44), and matched with the Y-shaped tube (44); the connecting port is a through port , arranged on the deflector block, with its two ends respectively connected to the water inlet end and the water outlet end of the Y-shaped tube (44), so as to connect the second heat dissipation tube and the two-way nozzle (42); the sliding port is a semi-arc-shaped port, arranged on the surface of the Y-shaped tube (44), and corresponding to the deflector block; the deflector rod is arranged along the radial direction of the deflector block, one end of which is fixedly connected to the deflector block, and the deflector rod is slidably connected to the sliding port; the first connecting rod (45) is arranged in the air inlet pipe (4), between the rotating plate (46) and the Y-shaped tube (44), one end of which is hinged to the rotating plate (46), and the other end is hinged to the other end of the deflector rod, and the hinge axis of the first connecting rod (45) is parallel to the rotation axis of the rotating plate (46).

5. The high temperature resistant fan for industrial boiler according to claim 3, characterized in that: The heat dissipation device comprises a temperature sensor, which is arranged on the heat-resistant shell (2) and is electrically connected to the controller.

6. The high temperature resistant fan for industrial boiler according to claim 3, characterized in that: The heat dissipation device comprises a valve (11); the valve (11) is arranged at the bottom of the fan housing (1).

7. A high temperature resistant fan for industrial boilers according to claim 6, characterized in that: The heat dissipation device comprises a water collecting pool (5), and the water collecting pool (5) is located directly below the valve (11) and the air inlet pipe (4).

8. The high temperature resistant fan for industrial boiler according to claim 3, characterized in that: The anti-backflow device includes a fireproof plate (36), a second connecting rod (47), and a third connecting rod (49); the fireproof plate (36) passes through the air outlet pipe (3) horizontally to close the air outlet pipe (3), and the sliding direction of the fireproof plate (36) is parallel to the axis of the centrifugal fan; the second connecting rod (47) is arranged above the rotating plate (46), and its lower end is fixedly connected to the upper part of the rotating plate (46); one end of the third connecting rod (49) is hinged to the upper end of the second connecting rod (47), and the other end is hinged to the fireproof plate (36), and the hinge axis of the third connecting rod (49) is parallel to the rotation axis of the rotating plate (46).

9. A high temperature resistant fan for industrial boilers according to claim 8, characterized in that: The anti-backflow device comprises a return spring (48); the return spring (48) is arranged obliquely above the air inlet pipe (4), the lower end of which is fixedly connected to the air inlet pipe (4), and the upper end of which is fixedly connected to the upper part of the second connecting rod (47).

10. The high temperature resistant fan for industrial boiler according to claim 8, characterized in that: The anti-backflow device comprises two support plates (31), a rotating rod (34), a gear ring (24), a gear (32), an external thread, a linkage ring (33), and a limit ring (35); the two support plates (31) are arranged inside the fan housing (1) and are located directly above the centrifugal fan; the two support plates (31) are fixedly connected to the inner top surface of the fan housing (1); the two support plates (31) are arranged at intervals along the sliding direction of the fireproof plate (36) and are located on both sides of the air outlet; the rotating rod (34) is a circular The fireproof plate (36) is cylindrical and parallel to the sliding direction of the fireproof plate (36), and laterally penetrates the two support plates (31), and is slidably connected to the two support plates (31); the gear ring (24) is coaxially sleeved outside the centrifugal blade (23), and is fixedly connected to the centrifugal blade (23); the gear (32) is coaxially sleeved outside the rotating rod (34), located between the two support plates (31), and is fixedly connected to the rotating rod (34); the gear (32) is in contact with the support plate (31) close to the motor (22), and is in contact with the support plate (31) close to the motor (22). The gear ring (24) is meshed; the external thread is arranged on the surface of the rotating rod (34), and is located on the side of the gear (32) away from the motor (22); the interlocking ring (33) is sleeved outside the rotating rod (34), and is located on the side of the gear (32) away from the motor (22), and is located directly below the fireproof plate (36); the interlocking ring (33) is fixedly connected to the side of the fireproof plate (36) close to the motor (22), and is in contact with the gear (32); the inner surface of the interlocking ring (33) is provided with A thread groove is provided, and the thread groove is threadedly connected to the external thread; the limiting ring (35) is sleeved outside the rotating rod (34), located between the two supporting plates (31), and located on the side of the external thread away from the motor (22); the limiting ring (35) is fixedly connected to the rotating rod (34); the distance between the limiting ring (35) and the external thread is greater than the width of the interlocking ring (33); and the distance between the limiting ring (35) and the supporting plate (31) away from the motor (22) is greater than the lateral width of the gear ring (24).

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