Energy-saving air duct heater and heating method for air cooler

Abstract

The invention relates to the technical field of energy-saving type air duct heaters, and discloses an energy-saving type air duct heater and a heating method for an air cooler. The energy-saving type air duct heater comprises a main mounting bin, an air inlet is connected to the exterior of the main mounting bin, a hot air connecting port is connected to one end of the main mounting bin, and a backflow air outlet is connected to the other end of the main mounting bin; an air inlet fan is mounted in the air inlet, and a hot air mechanism is mounted in the main mounting bin. According to the exhaust fan, air with the low temperature can be pumped out through a gap between a sealing connecting ring and the inner wall of a hot air connecting opening, and the air outlet width of a hot air mechanism can be adjusted when a hydraulic telescopic rod moves to drive the sealing connecting ring to move; after being blown to a heated object, hot air flows back through a space between the sealing connecting ring and the hot air connecting port and is exhausted through the backflow air outlet, so that a core heating part is always kept at a high temperature, the heating efficiency is remarkably improved, and energy is saved.

Description

Technical Field

[0001] This invention relates to the field of duct heater technology, specifically to an energy-saving duct heater and a heating method for air coolers. Background Technology

[0002] A duct heater is an electric heating device used to heat air in ducts. Its core function is to heat the airflow to the required temperature through electrical energy conversion to meet the process requirements of drying, vulcanization, heat treatment, heating and other processes in industrial and scientific research fields.

[0003] Chinese patent CN109520125B discloses a heater for a uniformly heated air duct, which mainly includes: a cylindrical air duct with openings at both ends, the air duct being horizontally arranged, and a filter screen being provided in the opening at any one end; a plurality of electric heating tubes being evenly distributed in the circumference of the air duct, the electric heating tubes being arranged parallel to the axis of the air duct; each electric heating tube being connected and fixed to the inner side wall of the air duct through fins; and each fin inside the air duct being arranged in the shape of the blades of an axial flow fan.

[0004] In the aforementioned patents and prior art, duct heaters typically use hot air to blow directly onto the object being heated. However, open ducts cause a large amount of hot air to dissipate, while enclosed spaces cannot expel internal air, preventing high-temperature air from reaching the core of the object being heated, resulting in low heating efficiency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an energy-saving duct heater and a heating method for air coolers.

[0006] An energy-saving duct heater includes a main mounting chamber, an air inlet connected to the outside of the main mounting chamber, a hot air inlet connected to one end of the main mounting chamber, a return air outlet connected to the other end of the main mounting chamber, an intake fan installed inside the air inlet, a hot air mechanism installed inside the main mounting chamber, a wind speed adjustment mechanism installed inside the main mounting chamber, and an exhaust fan installed inside the return air outlet. The wind power adjustment mechanism includes a hydraulic telescopic rod and a threaded pipe. One end of the threaded pipe is connected to the hot air mechanism, and the other end of the threaded pipe is fitted with the inside of the hot air connection port through a sealing ring. The movable end of the hydraulic telescopic rod is connected to the inside of the sealing ring. The threaded pipe has a multi-layer folded structure. The interior of the hot air mechanism is connected to the interior of the threaded pipe. The hydraulic telescopic rod passes through the interior of the hot air mechanism, and hot air passes through the interior of the threaded pipe for heating. The returning air passes through the exterior of the threaded pipe and is discharged through the returning air outlet. The hydraulic telescopic rod drives the threaded pipe to extend and retract through the sealing ring, which can adjust the distance between the sealing ring and the inner wall of the hot air connection port. When the distance between the sealing ring and the inner wall of the hot air connection port changes, the air volume of the returning air outlet can be adjusted.

[0007] Preferably, the interior of the air inlet is connected to the interior of the main installation chamber via a hot air mechanism, the hydraulic telescopic rod passes through the interior of the hot air mechanism and is connected to the interior of the hot air mechanism via a transmission connection, and the interior of the hot air mechanism is connected to the interior of the threaded pipe.

[0008] Preferably, an air filtration mechanism is installed inside the air inlet. The air filtration mechanism includes a filter plate, which is fixedly installed inside the air inlet. A sliding mounting block is slidably installed on the outside of the filter plate. A cleaning scraper is installed inside the sliding mounting block. A lower connecting plate is connected to the bottom of the sliding mounting block. A movable support plate is slidably installed inside the lower connecting plate.

[0009] Preferably, the filter plate has sliding grooves on two opposite sides of the sliding mounting block, and openings on the other two opposite sides of the sliding mounting block. The cleaning scraper and the lower connecting plate are slidably mounted on the outside of the filter plate through the sliding mounting block, and protrusions are provided on both sides of the movable bearing plate. When the sliding mounting block moves the cleaning scraper along the surface of the filter plate, it can clean the outside of the filter plate. The movable support plate can collect the dust cleaned by the cleaning scraper. When the lower connecting plate moves the movable support plate, the protrusion on the movable support plate can contact the inner wall of the air inlet. When the protrusion on the movable support plate contacts the inner wall of the air inlet, the movable support plate can slide inside the lower connecting plate, so that the dust on the movable support plate falls into the interior of the hot air mechanism.

[0010] Preferably, the hot air mechanism includes a hot air channel, the upper part of which is fixedly installed inside the air inlet, a dust collection groove installed on the outside of the hot air channel, a hot air heating wire installed inside the hot air channel, a movable channel installed inside the hot air channel, a movable connecting pipe connected to the other end of the movable channel, a movable adjusting pipe slidably installed inside the movable connecting pipe, a telescopic connecting rod rotatably connected to the outside of the movable adjusting pipe, and a fixed connecting ring fixedly installed on the outside of the hydraulic telescopic rod at the other end of the telescopic connecting rod.

[0011] Preferably, the hot air channel has a right-angle structure, the interior of the air inlet is connected to the interior of the threaded pipe through the hot air channel, the interior of the hot air channel is connected to the interior of the threaded pipe through a movable channel, one end of the movable channel is in contact with the inner wall of the hot air channel, and the other end of the movable channel is connected to a movable connecting pipe and a movable adjusting pipe, and the movable connecting pipe and the movable adjusting pipe are slidably connected. The air intake fan can blow hot air through the movable channel into the threaded pipe. The movable connecting pipe and the movable adjusting pipe can slide against each other to adjust the opening size of the movable channel.

[0012] Preferably, the exterior of the movable adjusting tube is connected to the hydraulic telescopic rod via a telescopic connecting rod and a fixed connecting ring. When the hydraulic telescopic rod moves telescopically, it can drive the end of the telescopic connecting rod connected to it to move through the fixed connecting ring. When the end of the telescopic connecting rod moves, it can drive the movable adjusting tube and the movable connecting tube to slide against each other. When the telescopic connecting rod moves, it can adapt to the change in distance between the fixed connecting ring and the movable adjusting tube by telescopically extending and retracting. When the distance between the movable adjusting tube and the movable connecting tube changes, the opening size of the movable channel can be adjusted.

[0013] Preferably, the wind power adjustment mechanism includes a telescopic mounting base, which is fixedly installed inside the main mounting compartment. A hydraulic mounting cylinder is installed on the outside of the telescopic mounting base, and a hydraulic telescopic rod is installed inside the hydraulic mounting cylinder. A telescopic connecting seat is installed at the movable end of the hydraulic telescopic rod, and the outside of the telescopic connecting seat is fixedly connected to the inside of the sealing connecting ring.

[0014] Preferably, when the hydraulic telescopic rod moves telescopically inside the hydraulic mounting cylinder, it can drive the telescopic connecting seat to move synchronously. When the telescopic connecting seat moves, it can drive the sealing connecting ring to move. When the sealing connecting ring moves, it can drive the threaded pipe to extend or shorten. When the hydraulic telescopic rod extends or shortens the threaded pipe, it can move the sealing ring inside the hot air connection port. The inside of the hot air connection port has a conical structure. When the position of the sealing ring changes, the distance between the sealing ring and the inner wall of the hot air connection port changes simultaneously.

[0015] A heating method for an air cooler uses the aforementioned energy-saving duct heater.

[0016] Compared with the prior art, the present invention provides an energy-saving duct heater and a heating method for air coolers, which has the following beneficial effects: 1. This type of energy-saving duct heater has an exhaust fan that can draw out cooler air through the gap between the sealing ring and the inner wall of the hot air connection port. When the hydraulic telescopic rod moves, it can also adjust the air outlet width of the hot air mechanism. This allows the hot air to reach the heated object and then flow back through the space between the sealing ring and the hot air connection port and be discharged through the return air outlet. This keeps the core heating part at a high temperature, thereby significantly improving heating efficiency and saving energy.

[0017] 2. This type of energy-saving duct heater can adjust the size of the frame composed of the movable regulating pipe and the movable connecting pipe when the movable regulating pipe moves. When the size of the frame composed of the movable connecting pipe and the movable regulating pipe changes, the size of the air outlet of the movable channel can be adjusted. When the size of the air outlet of the movable channel changes, the air velocity of the air outlet of the movable channel can be adjusted. Thus, the heating depth of the hot air can be adjusted. By adjusting the heating depth according to the heating needs, different heating requirements can be met, thereby improving heating efficiency. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of an energy-saving duct heater according to the present invention. Figure 1 ; Figure 2 This is a three-dimensional structural diagram of an energy-saving duct heater according to the present invention. Figure 2 ; Figure 3 This is a three-dimensional structural diagram of an energy-saving duct heater according to the present invention. Figure 3 ; Figure 4 This is a schematic diagram of the internal structure of an energy-saving duct heater according to the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the internal structure of an energy-saving duct heater according to the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the internal structure of the air inlet of an energy-saving duct heater according to the present invention; Figure 7 This is a schematic diagram of the internal structure of the hot air channel of an energy-saving duct heater according to the present invention; Figure 8 This is a three-dimensional structural schematic diagram of the air filtration mechanism of an energy-saving duct heater according to the present invention; Figure 9 This is a three-dimensional structural diagram of a sliding mounting block for an energy-saving duct heater according to the present invention. Figure 1 ; Figure 10 This is a three-dimensional structural diagram of a sliding mounting block for an energy-saving duct heater according to the present invention. Figure 2 ; Figure 11 This is a three-dimensional structural diagram of the movable channel of an energy-saving duct heater according to the present invention; Figure 12 This is a three-dimensional structural diagram of the movable regulating tube of an energy-saving duct heater according to the present invention.

[0019] In the diagram: 1. Main mounting compartment; 2. Air inlet; 3. Hot air connection port; 4. Return air outlet; 5. Air filtration mechanism; 51. Filter plate; 52. Sliding mounting block; 53. Cleaning scraper; 54. Lower connecting plate; 55. Movable support plate; 6. Intake fan; 7. Hot air mechanism; 71. Hot air passage; 72. Dust collection trough; 73. Hot air heating wire; 74. Movable passage; 75. Movable connecting pipe; 76. Movable adjusting pipe; 77. Telescopic connecting rod; 78. Fixed connecting ring; 8. Wind power adjustment mechanism; 81. Telescopic mounting seat; 82. Hydraulic mounting cylinder; 83. Hydraulic telescopic rod; 84. Telescopic connecting seat; 85. Threaded pipe; 86. Sealing connecting ring; 9. Exhaust fan. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes an energy-saving duct heater and a heating method for air coolers.

[0022] Example 1: Please see Figure 1 - Figure 12 An energy-saving duct heater includes a main mounting chamber 1, an air inlet 2 connected to the outside of the main mounting chamber 1, a hot air inlet 3 connected to one end of the main mounting chamber 1, a return air outlet 4 connected to the other end of the main mounting chamber 1, an intake fan 6 installed inside the air inlet 2, a hot air mechanism 7 installed inside the main mounting chamber 1, a wind speed adjustment mechanism 8 installed inside the main mounting chamber 1, and an exhaust fan 9 installed inside the return air outlet 4. The wind power adjustment mechanism 8 includes a hydraulic telescopic rod 83 and a threaded pipe 85. One end of the threaded pipe 85 is connected to the hot air mechanism 7, and the other end of the threaded pipe 85 is fitted to the inside of the hot air connection port 3 through a sealing ring 86. The movable end of the hydraulic telescopic rod 83 is connected to the inside of the sealing ring 86. The threaded pipe 85 is provided with a multi-layer folding structure. The interior of the hot air mechanism 7 is connected to the interior of the threaded pipe 85. The hydraulic telescopic rod 83 passes through the interior of the hot air mechanism 7. Hot air passes through the interior of the threaded pipe 85 for heating. The return air passes through the exterior of the threaded pipe 85 and is discharged through the return air outlet 4. The hydraulic telescopic rod 83 drives the threaded pipe 85 to extend and retract through the sealing ring 86, which can adjust the distance between the sealing ring 86 and the inner wall of the hot air connection port 3. When the distance between the sealing ring 86 and the inner wall of the hot air connection port 3 changes, the air volume of the return air outlet 4 can be adjusted.

[0023] During operation, the hot air connection port 3 can connect to the air cooler. External air can enter the interior of the hot air mechanism 7 through the air inlet 2 under the drive of the intake fan 6. When the air enters the interior of the hot air mechanism 7, the hot air mechanism 7 can heat the air. After the air is heated, the intake fan 6 can drive the air inside the hot air mechanism 7 into the threaded pipe 85, and then into the air cooler through the hot air connection port 3. The position of the sealing ring 86 can be adjusted by the hydraulic telescopic rod 83. The exhaust fan 9 can extract the cooler air through the gap between the sealing ring 86 and the inner wall of the hot air connection port 3. When the hydraulic telescopic rod 83 moves, it can also adjust the air outlet width of the hot air mechanism 7, so that the hot air blows to the heated object and then flows back through the space between the sealing ring 86 and the hot air connection port 3 and is discharged through the return air outlet 4, so that the core heating part always maintains a high temperature, thereby significantly improving heating efficiency and saving energy.

[0024] Example 2: The difference from the above embodiments is that, please refer to [link / reference needed]. Figure 1 - Figure 12 The interior of the air inlet 2 is connected to the interior of the main installation chamber 1 through the hot air mechanism 7. The hydraulic telescopic rod 83 passes through the interior of the hot air mechanism 7 and is connected to the interior of the hot air mechanism 7. The interior of the hot air mechanism 7 is connected to the interior of the threaded pipe 85.

[0025] An air filter mechanism 5 is installed inside the air inlet 2. The air filter mechanism 5 includes a filter plate 51, which is fixedly installed inside the air inlet 2. A sliding mounting block 52 is slidably installed on the outside of the filter plate 51. A cleaning scraper 53 is installed inside the sliding mounting block 52. A lower connecting plate 54 is connected to the bottom of the sliding mounting block 52. A movable bearing plate 55 is slidably installed inside the lower connecting plate 54.

[0026] The filter plate 51 is provided with sliding grooves on two opposite sides of the sliding mounting block 52, and openings are provided on the other two opposite sides of the sliding mounting block 52. The cleaning scraper 53 and the lower connecting plate 54 are slidably mounted on the outside of the filter plate 51 through the sliding mounting block 52. Both sides of the movable bearing plate 55 are provided with protrusions. When the sliding mounting block 52 moves the cleaning scraper 53 along the surface of the filter plate 51, it can clean the outside of the filter plate 51. The movable support plate 55 can collect the dust cleaned by the cleaning scraper 53. When the lower connecting plate 54 moves the movable support plate 55, the protrusion on the movable support plate 55 can contact the inner wall of the air inlet 2. When the protrusion on the movable support plate 55 contacts the inner wall of the air inlet 2, the movable support plate 55 can slide inside the lower connecting plate 54, so that the dust on the movable support plate 55 falls into the interior of the hot air mechanism 7.

[0027] During operation, the filter plate 51 filters dust and debris from the air entering the air inlet 2. The filtered debris remains on the outside of the filter plate 51. When too much dust accumulates on the filter plate 51, the sliding mounting block 52 moves along the groove on the outside of the filter plate 51. As the sliding mounting block 52 slides, it drives the cleaning scraper 53 to move synchronously. When the cleaning scraper 53 moves, it scrapes the dust on the filter plate 51. As the dust moves, some of the dust falls through the filter holes on the filter plate 51 onto the movable support plate 55. As the sliding mounting block 52 moves, it drives the movable support plate 55 to move synchronously to collect the dust. After collection, the sliding mounting block 52 continues to move, causing the protrusion on the movable support plate 55 to contact the inner wall of the air inlet 2, thereby causing the movable support plate 55 to slide along the inside of the lower connecting plate 54. As the movable support plate 55 slides along the inside of the lower connecting plate 54, the dust falls into the dust collection groove 72, thus quickly cleaning the dust on the filter plate 51.

[0028] Example 3: The difference from the above embodiments is that, please refer to [link / reference needed]. Figure 1 - Figure 12 The hot air mechanism 7 includes a hot air channel 71, the upper part of which is fixedly installed inside the air inlet 2. A dust collection trough 72 is installed on the outside of the hot air channel 71. A hot air heating wire 73 is installed inside the hot air channel 71. A movable channel 74 is installed inside the hot air channel 71. A movable connecting pipe 75 is connected to the other end of the movable channel 74. A movable adjusting pipe 76 is slidably installed inside the movable connecting pipe 75. A telescopic connecting rod 77 is rotatably connected to the outside of the movable adjusting pipe 76. A fixed connecting ring 78 is fixedly installed on the outside of the hydraulic telescopic rod 83.

[0029] The hot air channel 71 has a right-angle structure. The interior of the air inlet 2 is connected to the interior of the threaded pipe 85 through the hot air channel 71. The interior of the hot air channel 71 is connected to the interior of the threaded pipe 85 through the movable channel 74. One end of the movable channel 74 is attached to the inner wall of the hot air channel 71, and the other end of the movable channel 74 is connected to the movable connecting pipe 75 and the movable adjusting pipe 76. The movable connecting pipe 75 and the movable adjusting pipe 76 are slidably connected. The intake fan 6 can blow hot air through the movable channel 74 into the threaded pipe 85. The movable connecting pipe 75 and the movable adjusting pipe 76 can slide against each other to adjust the opening size of the movable channel 74.

[0030] The exterior of the movable adjusting tube 76 is connected to the hydraulic telescopic rod 83 via a telescopic connecting rod 77 and a fixed connecting ring 78. When the hydraulic telescopic rod 83 moves, it can drive the telescopic connecting rod 77 to move at one end connected to it via the fixed connecting ring 78. When one end of the telescopic connecting rod 77 moves, it can cause the movable adjusting tube 76 and the movable connecting tube 75 to slide against each other. When the telescopic connecting rod 77 moves, it can adapt to the change in distance between the fixed connecting ring 78 and the movable adjusting tube 76 by telescopic extension. When the distance between the movable adjusting tube 76 and the movable connecting tube 75 changes, it can adjust the opening size of the movable channel 74.

[0031] During operation, the intake fan 6 draws air into the hot air passage 71. The hot air heating wire 73 heats the air entering the hot air passage 71. The intake fan 6 then moves the air inside the hot air passage 71, which then enters the threaded pipe 85 through the movable passage 74. When the hydraulic telescopic rod 83 moves the sealing ring 86, it also moves the fixed ring 78 synchronously. When the fixed ring 78 moves, it moves one end of the telescopic connecting rod 77 connected to it synchronously. When one end of the telescopic connecting rod 77 moves, it moves the telescopic connecting rod 7... The other end of 7 moves synchronously, thereby driving the movable regulating pipe 76 to move. When the movable regulating pipe 76 moves, the size of the frame composed of the movable regulating pipe 76 and the movable connecting pipe 75 can be adjusted. When the size of the frame composed of the movable connecting pipe 75 and the movable regulating pipe 76 changes, the size of the air outlet of the movable channel 74 can be adjusted. When the size of the air outlet of the movable channel 74 changes, the wind speed of the air outlet of the movable channel 74 can be adjusted, thereby adjusting the heating depth of the hot air. By adjusting the heating depth according to the heating needs, different heating requirements can be met and the heating efficiency can be improved.

[0032] Example 4: The difference from the above embodiments is that, please refer to [link / reference needed]. Figure 1 - Figure 12The wind power adjustment mechanism 8 includes a telescopic mounting base 81, which is fixedly installed inside the main mounting compartment 1. A hydraulic mounting cylinder 82 is installed on the outside of the telescopic mounting base 81. A hydraulic telescopic rod 83 is installed inside the hydraulic mounting cylinder 82. A telescopic connecting seat 84 is installed on the movable end of the hydraulic telescopic rod 83. The outside of the telescopic connecting seat 84 is fixedly connected to the inside of the sealing connecting ring 86.

[0033] When the hydraulic telescopic rod 83 moves inside the hydraulic mounting cylinder 82, it can drive the telescopic connecting seat 84 to move synchronously. When the telescopic connecting seat 84 moves, it can drive the sealing connecting ring 86 to move. When the sealing connecting ring 86 moves, it can drive the threaded pipe 85 to extend or shorten. When the hydraulic telescopic rod 83 drives the threaded pipe 85 to extend or shorten, it can drive the sealing ring 86 to move inside the hot air connection port 3. The inside of the hot air connection port 3 is a conical structure. When the position of the sealing ring 86 changes, the distance between the sealing ring 86 and the inner wall of the hot air connection port 3 changes simultaneously.

[0034] During operation, the exhaust fan 9 can expel excess air through the gap between the sealing ring 86 and the hot air connection port 3. Thus, the extension and retraction of the hydraulic telescopic rod 83 can drive the sealing ring 86 to move inside the hot air connection port 3. When the position of the sealing ring 86 inside the hot air connection port 3 changes, the distance between the sealing ring 86 and the inner wall of the hot air connection port 3 also changes. When the distance between the sealing ring 86 and the hot air connection port 3 changes, the air volume of the exhaust fan 9 can also be adjusted, thereby adjusting the ventilation speed according to the heating requirements.

[0035] Example 5: A heating method for an air cooler, using an energy-saving duct heater as described in Examples 1 to 4, includes the following steps: The intake fan 6 can draw outside air into the interior of the hot air mechanism 7; The hot air mechanism 7 can heat the air and guide it into the interior of the threaded pipe 85; The exhaust fan 9 can drive the heated air to flow back out through the gap between the sealing ring 86 and the hot air connection port 3. The wind speed regulation mechanism 8 can regulate the flow speed of hot air and the return speed of air.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving duct heater, comprising a main mounting compartment, characterized in that: The main installation chamber is externally connected to an air inlet, one end of the main installation chamber is connected to a hot air inlet, the other end of the main installation chamber is connected to a return air outlet, an intake fan is installed inside the air inlet, a hot air mechanism is installed inside the main installation chamber, a wind speed adjustment mechanism is installed inside the main installation chamber, and an exhaust fan is installed inside the return air outlet. The wind power adjustment mechanism includes a hydraulic telescopic rod and a threaded pipe. One end of the threaded pipe is connected to the hot air mechanism, and the other end of the threaded pipe is fitted with the inside of the hot air connection port through a sealing ring. The movable end of the hydraulic telescopic rod is connected to the inside of the sealing ring. The threaded pipe has a multi-layer folded structure. The interior of the hot air mechanism is connected to the interior of the threaded pipe. The hydraulic telescopic rod passes through the interior of the hot air mechanism, and hot air passes through the interior of the threaded pipe for heating. The returning air passes through the exterior of the threaded pipe and is discharged through the returning air outlet. The hydraulic telescopic rod drives the threaded pipe to extend and retract through the sealing ring, which can adjust the distance between the sealing ring and the inner wall of the hot air connection port. When the distance between the sealing ring and the inner wall of the hot air connection port changes, the air volume of the returning air outlet can be adjusted.

2. The energy-saving duct heater according to claim 1, characterized in that: The interior of the air inlet is connected to the interior of the main installation chamber via a hot air mechanism. The hydraulic telescopic rod passes through the interior of the hot air mechanism and is connected to the interior of the hot air mechanism via a transmission. The interior of the hot air mechanism is connected to the interior of the threaded pipe.

3. The energy-saving duct heater according to claim 2, characterized in that: An air filtration mechanism is installed inside the air inlet. The air filtration mechanism includes a filter plate, which is fixedly installed inside the air inlet. A sliding mounting block is slidably installed on the outside of the filter plate. A cleaning scraper is installed inside the sliding mounting block. A lower connecting plate is connected to the bottom of the sliding mounting block. A movable support plate is slidably installed inside the lower connecting plate.

4. The energy-saving duct heater according to claim 3, characterized in that: The filter plate is provided with sliding grooves on two opposite sides of the sliding mounting block, and openings are provided on the other two opposite sides of the sliding mounting block. The cleaning scraper and the lower connecting plate are slidably mounted on the outside of the filter plate through the sliding mounting block. Both sides of the movable bearing plate are provided with protrusions. When the sliding mounting block moves the cleaning scraper along the surface of the filter plate, it can clean the outside of the filter plate. The movable support plate can collect the dust cleaned by the cleaning scraper. When the lower connecting plate moves the movable support plate, the protrusion on the movable support plate can contact the inner wall of the air inlet. When the protrusion on the movable support plate contacts the inner wall of the air inlet, the movable support plate can slide inside the lower connecting plate, so that the dust on the movable support plate falls into the interior of the hot air mechanism.

5. An energy-saving duct heater according to claim 4, characterized in that: The hot air mechanism includes a hot air channel, the upper part of which is fixedly installed inside the air inlet. A dust collection groove is installed on the outside of the hot air channel. A hot air heating wire is installed inside the hot air channel. A movable channel is installed inside the hot air channel. A movable connecting pipe is connected to the other end of the movable channel. A movable adjusting pipe is slidably installed inside the movable connecting pipe. A telescopic connecting rod is rotatably connected to the outside of the movable adjusting pipe. A fixed connecting ring is fixedly installed on the outside of the hydraulic telescopic rod at the other end of the telescopic connecting rod.

6. The energy-saving duct heater according to claim 5, characterized in that: The hot air channel has a right-angle structure. The interior of the air inlet is connected to the interior of the threaded pipe through the hot air channel. The interior of the hot air channel is connected to the interior of the threaded pipe through a movable channel. One end of the movable channel is in contact with the inner wall of the hot air channel, and the other end of the movable channel is connected to a movable connecting pipe and a movable adjusting pipe. The movable connecting pipe and the movable adjusting pipe are slidably connected. The air intake fan can blow hot air through the movable channel into the threaded pipe. The movable connecting pipe and the movable adjusting pipe can slide against each other to adjust the opening size of the movable channel.

7. An energy-saving duct heater according to claim 6, characterized in that: The movable adjusting tube is connected to the hydraulic telescopic rod via a telescopic connecting rod and a fixed connecting ring. When the hydraulic telescopic rod moves, it can drive the end of the telescopic connecting rod connected to it to move through the fixed connecting ring. When the end of the telescopic connecting rod moves, it can drive the movable adjusting tube and the movable connecting tube to slide against each other. When the telescopic connecting rod moves, it can adapt to the change in distance between the fixed connecting ring and the movable adjusting tube by telescopic extension and retraction. When the distance between the movable adjusting tube and the movable connecting tube changes, the opening size of the movable channel can be adjusted.

8. An energy-saving duct heater according to claim 7, characterized in that: The wind power adjustment mechanism includes a telescopic mounting base, which is fixedly installed inside the main mounting compartment. A hydraulic mounting cylinder is installed on the outside of the telescopic mounting base, and a hydraulic telescopic rod is installed inside the hydraulic mounting cylinder. A telescopic connecting seat is installed on the movable end of the hydraulic telescopic rod, and the outside of the telescopic connecting seat is fixedly connected to the inside of the sealing connecting ring.

9. An energy-saving duct heater according to claim 8, characterized in that: When the hydraulic telescopic rod moves in and out of the hydraulic mounting cylinder, it can drive the telescopic connecting seat to move synchronously. When the telescopic connecting seat moves, it can drive the sealing connecting ring to move. When the sealing connecting ring moves, it can drive the threaded pipe to extend or shorten. When the hydraulic telescopic rod extends or shortens the threaded pipe, it can move the sealing ring inside the hot air connection port. The inside of the hot air connection port has a conical structure. When the position of the sealing ring changes, the distance between the sealing ring and the inner wall of the hot air connection port changes simultaneously.

10. A heating method for an air cooler, characterized in that, The method of using an energy-saving duct heater as described in any one of claims 1-9 includes the following steps; The intake fan can draw outside air into the interior of the hot air mechanism; The hot air mechanism can heat the air and guide it into the interior of the threaded pipe; The exhaust fan can drive the heated air to flow back out through the gap between the sealing ring and the hot air connection port. The wind-powered regulating mechanism can adjust the flow speed of hot air and the return speed of air.

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