Air heater with gradient heating function

Abstract

The invention discloses an air heater with a gradient temperature rising function, and relates to the technical field of air heaters, the air heater comprises a bottom plate, a heating device, an air outlet, an air inlet, a junction box, a centrifugal fan and a first motor, the heating device can change the angle of each guide vane in sequence, and the air outlet is communicated with the air inlet. The temperature gradient from low to high is achieved, the overall heating efficiency is improved, energy waste is reduced, and when impurities on the filter screen reach a preset threshold value, the dust removal device can detect and remove the impurities on the surface of the filter screen, so that the permeability and the normal working state of the filter screen are recovered, and the service life of the filter screen is prolonged. And a stable negative pressure channel is established between the filter screen dust removal area and the collection box, so that the removed impurities are directly adsorbed by airflow and conveyed into the collection box, the impurities are effectively prevented from diffusing again or remaining in the equipment in the cleaning process, the dust removal efficiency is improved, the structural design is simplified, and the cost is reduced. And the equipment manufacturing and maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air heater, in particular to an air heater with gradient temperature rising function. BACKGROUND

[0002] The air heater is a heat energy conversion device widely used in industrial, agricultural and civil fields, mainly used for converting electric energy, gas and other heat sources into hot air to meet the hot air supply demand of heating, drying, heat preservation, dehumidification, heat treatment and other purposes. The core function of the air heater is to heat and deliver air to the designated area or equipment to meet the predetermined temperature and flow requirements. Among the common air heaters, the electric heating type air heater is the most widely used in various industrial equipment due to its simple structure, convenient operation and high thermal efficiency.

[0003] The existing air heater has the following problems in use: the existing air heater has local overheating or overcooling, resulting in temperature difference inside, which reduces the overall heating efficiency and causes energy waste; in the long-term operation of the air heater, impurities in the air adhere to the surface of the filter screen, affecting the entry of air, thereby reducing the heating efficiency, increasing the energy consumption and affecting the service life of the air heater. SUMMARY

[0004] The purpose of the present application is to provide an air heater with gradient temperature rising function to solve the problems in the prior art.

[0005] To achieve the above purpose, the present application provides the following technical scheme: the air heater comprises a bottom plate, a heating device is arranged above the bottom plate, an air outlet is arranged on one side of the heating device, an air inlet is arranged on the other side of the heating device, a centrifugal fan is arranged on one side of the air inlet, a first motor is arranged on one side of the centrifugal fan, a first support and a second support are arranged on the bottom plate, the centrifugal fan is arranged on the first support, the first motor is arranged on the second support, a junction box is arranged above the heating device, the junction box, the centrifugal fan and the first motor are connected to a control system. In work, the first motor is started, the first motor drives the centrifugal fan to start, the centrifugal fan inputs external air into the air inlet, the air enters the heating device from the air inlet, and the air is discharged to the outside from the air outlet after being heated by the heating device.

[0006] The heating device comprises a shell, the shell is arranged on the bottom plate, a dust removal device is arranged in the shell, an electric heating tube is arranged on one side of the dust removal device, a gradient temperature rising device is arranged on one side of the electric heating tube, the electric heating tube and the gradient temperature rising device are arranged in the shell, and the electric heating tube is connected to the control system.

[0007] The dust removal device comprises a filter plate, the filter plate is installed in a shell, a recess is arranged on the filter plate, a detection device is installed in the recess, a driving device is installed on one side of the detection device, a cleaning device is installed on the driving device, the cleaning device is located on the filter plate, and a collecting device is installed on one side of the filter plate. The pressure difference between the two sides of the filter plate is detected by the detection device. When the pressure difference between the two sides of the filter plate reaches a predetermined threshold value, the driving device drives the cleaning device to start, the surface of the filter plate is cleaned by the cleaning device, and the impurities on the surface of the filter plate are removed and collected in the collecting device.

[0008] The detection device comprises a sealed shell, the sealed shell is installed in the recess, a high-pressure cavity and a low-pressure cavity are arranged in the sealed shell, the high-pressure cavity is located on one side of the filter plate, the low-pressure cavity is located on the other side of the filter plate, a connecting pipe is installed between the high-pressure cavity and the low-pressure cavity, a high-pressure pipeline and a low-pressure pipeline are installed on one side of the sealed shell, the high-pressure cavity and the high-pressure pipeline are communicated, the low-pressure cavity and the low-pressure pipeline are communicated, a high-pressure bellows is installed in the high-pressure cavity, one end of the high-pressure bellows is installed on the cavity wall of the high-pressure cavity, a temperature compensation bellows is installed on the other end of the high-pressure bellows, the high-pressure bellows and the temperature compensation bellows are communicated through a small hole, a low-pressure bellows is installed in the low-pressure cavity, one end of the low-pressure bellows is installed on the cavity wall of the low-pressure cavity, a first rack is installed on the other end of the low-pressure bellows, the high-pressure bellows and the connecting pipe are communicated, the low-pressure bellows and the connecting pipe are communicated, and a connecting shaft is installed between the high-pressure bellows and the low-pressure bellows. When impurities accumulate on the filter plate, the ventilation of the filter plate decreases, the pressure on the side of the filter plate close to the air outlet decreases, the pressure in the low-pressure cavity decreases, the high-pressure bellows is compressed, the volume decreases, the incompressible liquid in the high-pressure bellows enters the low-pressure bellows through the connecting pipe, the low-pressure bellows is elongated, the volume increases, the low-pressure bellows drives the connecting shaft to move away from the high-pressure cavity, and the low-pressure bellows drives the first rack to move away from the high-pressure cavity. When the temperature changes, the volume of the incompressible liquid changes due to the influence of temperature, the incompressible liquid in the high-pressure bellows enters and exits the temperature compensation bellows through the small hole, and the temperature compensation bellows is elongated and contracted to compensate for the temperature.

[0009] The driving device comprises a protective shell, which is installed on one side of the sealed shell, a clockwork box is installed in the interior of the protective shell, a first rotating shaft is rotatably installed in the interior of the clockwork box, a clockwork spring is installed on the first rotating shaft and in the interior of the clockwork box, a large gear wheel is rotatably installed on the first rotating shaft, a ratchet wheel is installed in the interior of the large gear wheel and on the first rotating shaft, a pawl is installed on the inner wall of the large gear wheel, an energizing spring is installed between the pawl and the large gear wheel, a first bevel gear is installed on one end of the first rotating shaft, a second rotating shaft is rotatably installed on the filter plate, a second bevel gear is installed on one end of the second rotating shaft, the first bevel gear and the second bevel gear are engaged, a cleaning device is installed on the other end of the second rotating shaft, and the energizing spring is connected to the control system. When the first rack moves, the first rack drives the large gear wheel to rotate, at this time, the pawl abuts against the ratchet wheel, the large gear wheel drives the ratchet wheel to rotate, the ratchet wheel drives the first rotating shaft to rotate, the first rotating shaft drives the clockwork spring to store energy, when the first rack moves to a predetermined threshold, the large gear wheel is disengaged from the first rack, the energizing spring is controlled to be energized and contracted, the energizing spring drives the pawl to retract, the rotation of the ratchet wheel is not affected, the clockwork spring drives the first rotating shaft to rotate, the first rotating shaft drives the first bevel gear to rotate, the first bevel gear drives the second bevel gear to rotate, the second bevel gear drives the second rotating shaft to rotate, and the second rotating shaft drives the short rod to rotate.

[0010] The cleaning device comprises a short rod, which is installed on the second rotating shaft, a limiting block is connected to one side of the short rod, an extension rod is slidably installed on the short rod, a sliding groove is arranged in the interior of the extension rod, the limiting block slides in the sliding groove, a scraper is connected to the outer side of the extension rod, a second spring is installed on one end of the short rod, and one end of the second spring is installed in the interior of the extension rod. When the clockwork spring starts to release energy, the short rod rotates rapidly, the short rod drives the extension rod to rotate, the extension rod moves away from the second rotating shaft under the action of centrifugal force, and impurities on the filter plate are removed, when the clockwork spring releases energy for a period of time, the short rod rotates slowly, the short rod drives the extension rod to rotate, the extension rod retracts when moving upwards due to the lack of sufficient centrifugal force, the extension rod extends when moving downwards, and the scraper pushes the impurities to the direction of the dust collection box.

[0011] The collecting device comprises a dust guide shell, an air inlet is installed on one side of the dust guide shell, a collection box is installed on one end of the dust guide shell, dust blocking holes are arranged on the collection box, a suction pipe is installed above the dust guide shell, a dust collection box is installed on one side of the suction pipe, a contraction cavity, a throat cavity and a diffusion cavity are arranged in the dust guide shell along the air flow direction, the suction pipe is communicated with the throat cavity, and the diffusion cavity and the collection box are communicated. The air delivered by the centrifugal fan enters the air inlet, enters the contraction cavity through the air inlet, the air flow rate is accelerated when the air enters the throat cavity, a negative pressure is formed in the suction pipe, impurities in the dust collection box are sucked into the diffusion cavity, and the impurities enter the collection box through the diffusion cavity.

[0012] The gradient temperature rising device comprises an outer frame, which is installed in the inside of the shell, a guide vane is rotatably installed in the inside of the outer frame, a first pinion is installed at one end of the guide vane, a second pinion is rotatably installed above the outer frame, a belt is installed outside the first pinion and the second pinion, a third pinion is installed at one side of the second pinion, and an adjusting device is slidably installed on the outer frame.

[0013] The adjusting device comprises a bimetallic block, which is installed on the inner wall of the shell, a push rod is installed at one side of the bimetallic block, an amplification lever is rotatably installed on the push rod, a support is installed on the inner wall of the shell, the amplification lever rotates around the support, a sliding plate is rotatably installed at the other side of the amplification lever, the sliding plate slides on the outer frame, a second rack is connected to the sliding plate, and the third pinion and the second rack are engaged. When the temperature increases, the bimetallic block is heated and stretched, the bimetallic block drives the push rod to move away from the outer frame, the push rod drives the amplification lever to rotate, the amplification lever drives the sliding plate to slide on the outer frame towards the air outlet, the sliding plate drives the second rack to slide towards the air outlet, the third rack drives the third pinion on the first outer frame to rotate, the third pinion drives the second pinion to rotate, the second pinion drives the belt to rotate, the belt drives the first pinion to rotate, the first pinion drives the guide vane to rotate, the angle of the guide vane is changed, the airflow is guided to flow through the heating area at different paths and speeds, as the temperature continues to rise, the bending degree of the bimetallic block becomes larger, the second rack gradually drives the third pinions on the second outer frame and the third outer frame to rotate, the angles of the guide vanes on the second outer frame and the third outer frame are gradually changed, a low-to-high temperature gradient is realized, the airflow presents a continuous temperature rising process when passing through the inside of the device, and problems such as local overheating or cooling lag caused by temperature mutation are avoided.

[0014] The high-pressure corrugated pipe, the temperature compensation corrugated pipe, the low-pressure corrugated pipe and the connecting pipe are filled with incompressible liquid.

[0015] Compared with the prior art, the present application has the following advantages: 1、The present application adopts the gradient temperature rising technology, the angles of the guide vanes are changed in sequence, the airflow is guided to flow through the heating area at different paths and speeds, a low-to-high temperature gradient is realized, the airflow presents a continuous temperature rising process when passing through the inside of the device, and problems such as local overheating or cooling lag caused by temperature mutation are avoided, this step-by-step temperature rising mode can effectively eliminate the internal temperature difference, improve the overall heating efficiency, reduce energy waste, and help prolong the service life of the core heating element. 2、The application adopts pressure detection technology, detects the pressure difference before and after the filter screen to detect the clogging degree of the filter screen, when the impurities on the filter screen reach the preset threshold, the dust removal device removes the impurities on the surface of the filter screen, so as to restore the permeability and normal working state of the filter screen, prolong the service life of the equipment, avoid the problems of reduced heating efficiency, increased fan load or system failure caused by filter screen clogging. 3、The application adopts negative pressure collection technology, establishes a stable negative pressure channel between the filter screen dust removal area and the collection box, so that the removed impurities are directly adsorbed and transported to the collection box by the airflow without relying on mechanical transmission device, which not only effectively avoids the problem of impurities re-expanding or remaining in the equipment during cleaning process, improves the dust removal efficiency, but also simplifies the structure design, reduces the equipment manufacturing and maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a perspective view of the air heater of the application; Figure 2 It is an internal schematic view of the heating device of the application; Figure 3 It is a perspective view of the dust removal device of the application; Figure 4 It is a sectional view of the detection device of the application; Figure 5 It is a perspective view of the driving device of the application; Figure 6 It is an explosion view of the cleaning device of the application; Figure 7 It is a perspective view of the collection device of the application; Figure 8 It is a sectional view of the collection device of the application; Figure 9 It is a perspective view of the gradient temperature rising device of the application; Figure 10 It is a perspective view of the adjusting device of the application.

[0017] In the diagram: 1. Base plate; 2. Heating device; 21. Outer shell; 22. Dust removal device; 221. Filter plate; 222. Detection device; 2221. Sealing shell; 2222. High-pressure pipeline; 2223. Low-pressure pipeline; 2224. High-pressure bellows; 2225. Temperature-compensated bellows; 2226. Low-pressure bellows; 2227. Connecting pipe; 2228. Connecting shaft; 2229. First rack; 223. Drive device; 2231. First rotating shaft; 2232. Clockwork box; 2233. Large gear; 2234. Ratchet; 2235. First bevel gear; 2236. Second bevel gear; 2237. Second rotating shaft; 224. Cleaning device; 2241. Short rod; 224 2. Limiting block; 2243. Extension rod; 2244. Scraper; 225. Collection device; 2251. Dust guide shell; 2252. Air inlet; 2253. Dust collection box; 2254. Collection box; 2255. Adsorption tube; 2256. Contraction chamber; 2257. Throat cavity; 2258. Diffusion chamber; 23. Heating tube; 24. Gradient temperature rise device; 241. Outer frame; 242. Guide vane; 243. First pinion; 244. Belt; 245. Third pinion; 246. Adjustment device; 2461. Bimetallic block; 2462. Amplifying lever; 2463. Slide plate; 3. Air outlet; 4. Air inlet; 5. Junction box; 6. Centrifugal fan; 7. First motor. Detailed Implementation

[0018] 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.

[0019] Example: Figures 1-10 As shown, the present invention provides a technical solution for an air heater, which includes a base plate 1. A heating device 2 is located above the base plate 1. An air outlet 3 is installed on one side of the heating device 2, and an air inlet 4 is installed on the other side. A centrifugal fan 6 is installed on one side of the air inlet 4, and a first motor 7 is installed on one side of the centrifugal fan 6. A first support and a second support are installed on the base plate 1. The centrifugal fan 6 is mounted on the first support, and the first motor 7 is mounted on the second support. A junction box 5 is installed above the heating device 2. The junction box 5, the centrifugal fan 6, and the first motor 7 are connected to a control system. During operation, the first motor 7 is started, driving the centrifugal fan 6 to start. The centrifugal fan 6 draws outside air into the air inlet 4, which then enters the heating device 2. After being heated by the heating device 2, the air is discharged to the outside through the air outlet 3.

[0020] The heating device 2 comprises a shell 21 mounted on the bottom plate 1, a dust removal device 22 mounted in the shell 21, an electric heating pipe 23 mounted on one side of the dust removal device 22, a gradient temperature rising device 24 mounted on one side of the electric heating pipe 23, and the electric heating pipe 23 and the gradient temperature rising device 24 are installed in the shell 21, and the electric heating pipe 23 is connected to the control system.

[0021] The dust removal device 22 comprises a filter plate 221 mounted in the shell 21, a recess is arranged on the filter plate 221, a detection device 222 is mounted in the recess, a driving device 223 is mounted on one side of the detection device 222, a cleaning device 224 is mounted on the driving device 223, the cleaning device 224 is located on the filter plate 221, and a collecting device 225 is mounted on one side of the filter plate 221. The pressure difference on both sides of the filter plate 221 is detected by the detection device 222, when the pressure difference on both sides of the filter plate 221 reaches a predetermined threshold value, the driving device 223 drives the cleaning device 224 to start, the cleaning device 224 cleans the surface of the filter plate 221, removes the impurities on the surface of the filter plate 221, and the impurities are collected in the collecting device 225.

[0022] The detection device 222 comprises a sealed shell 2221, the sealed shell 2221 is installed in the groove, the inside of the sealed shell 2221 is provided with a high-pressure cavity and a low-pressure cavity, the high-pressure cavity is located at one side of the filter plate 221, the low-pressure cavity is located at the other side of the filter plate 221, a connecting pipe 2227 is installed between the high-pressure cavity and the low-pressure cavity, a high-pressure pipe 2222 and a low-pressure pipe 2223 are installed at one side of the sealed shell 2221, the high-pressure cavity and the high-pressure pipe 2222 are communicated, the low-pressure cavity and the low-pressure pipe 2223 are communicated, a high-pressure bellows 2224 is installed in the high-pressure cavity, one end of the high-pressure bellows 2224 is installed on the cavity wall of the high-pressure cavity, the other end of the high-pressure bellows 2224 is installed with a temperature compensation bellows 2225, the high-pressure bellows 2224 and the temperature compensation bellows 2225 are communicated through a small hole, a low-pressure bellows 2226 is installed in the low-pressure cavity, one end of the low-pressure bellows 2226 is installed on the cavity wall of the low-pressure cavity, the other end of the low-pressure bellows 2226 is installed with a first rack 2229, the high-pressure bellows 2224 and the connecting pipe 2227 are communicated, the low-pressure bellows 2226 and the connecting pipe 2227 are communicated, a connecting shaft 2228 is installed between the high-pressure bellows 2224 and the low-pressure bellows 2226, the high-pressure bellows 2224, the temperature compensation bellows 2225, the low-pressure bellows 2226 and the connecting pipe 2227 are filled with incompressible liquid. When impurities accumulate on the filter plate 221, the ventilation of the filter plate 221 is reduced, the pressure on the side of the filter plate 221 close to the air outlet 3 is reduced, causing the pressure in the low-pressure cavity to be reduced, the high-pressure bellows 2224 is compressed, the volume is reduced, the incompressible liquid in the high-pressure bellows 2224 enters the low-pressure bellows 2226 through the connecting pipe 2227, the low-pressure bellows 2226 is elongated, the volume is increased, the low-pressure bellows 2226 drives the connecting shaft 2228 to move away from the high-pressure cavity, the low-pressure bellows 2226 drives the first rack 2229 to move away from the high-pressure cavity, when the temperature changes, the volume of the incompressible liquid changes due to the influence of temperature, the incompressible liquid in the high-pressure bellows 2224 enters and exits the temperature compensation bellows 2225 through the small hole, and the temperature compensation is realized through the expansion and contraction of the temperature compensation bellows 2225.

[0023] The driving device 223 comprises a protective shell mounted on one side of the sealing shell 2221, a clockwork box 2232 is mounted in the protective shell, a first rotating shaft 2231 is rotatably mounted in the clockwork box 2232, a clockwork spring is mounted on the first rotating shaft 2231 and in the clockwork box 2232, a large gear 2233 is rotatably mounted on the first rotating shaft 2231, a ratchet wheel 2234 is mounted on the first rotating shaft 2231 and in the large gear 2233, a pawl is mounted on the inner wall of the large gear 2233, a power spring is mounted between the pawl and the large gear 2233, a first bevel gear 2235 is mounted on one end of the first rotating shaft 2231, a second rotating shaft 2237 is rotatably mounted on the filter plate 221, a second bevel gear 2236 is mounted on one end of the second rotating shaft 2237, the first bevel gear 2235 is engaged with the second bevel gear 2236, and a cleaning device 224 is mounted on the other end of the second rotating shaft 2237. The power spring is connected to the control system. When the first rack 2229 moves, the first rack 2229 drives the large gear 2233 to rotate, at this time the pawl abuts against the ratchet wheel 2234, the large gear 2233 drives the ratchet wheel 2234 to rotate, the ratchet wheel 2234 drives the first rotating shaft 2231 to rotate, the first rotating shaft 2231 drives the clockwork spring to store energy, when the first rack 2229 moves to a predetermined threshold, the large gear 2233 is disengaged from the first rack 2229, the power spring is controlled to be energized and contracted, the power spring drives the pawl to retract, without affecting the rotation of the ratchet wheel 2234, the clockwork spring drives the first rotating shaft 2231 to rotate, the first rotating shaft 2231 drives the first bevel gear 2235 to rotate, the first bevel gear 2235 drives the second bevel gear 2236 to rotate, the second bevel gear 2236 drives the second rotating shaft 2237 to rotate, and the second rotating shaft 2237 drives the short rod 2241 to rotate.

[0024] The cleaning device 224 comprises a short rod 2241 mounted on the second rotating shaft 2237, a limiting block 2242 connected to one side of the short rod 2241, an extension rod 2243 slidably mounted on the short rod 2241, a sliding groove formed in the extension rod 2243, the limiting block 2242 sliding in the sliding groove, a scraper 2244 connected to the outer side of the extension rod 2243, and a second spring mounted on one end of the short rod 2241 and in the extension rod 2243. When the clockwork spring starts to release energy, the short rod 2241 rotates rapidly, the short rod 2241 drives the extension rod 2243 to rotate, the extension rod 2243 moves away from the second rotating shaft 2237 under the action of centrifugal force, and impurities on the filter plate 221 are removed, when the clockwork spring releases energy for a period of time, the short rod 2241 rotates slowly, the short rod 2241 drives the extension rod 2243 to rotate, the extension rod 2243 retracts when moving upwards due to insufficient centrifugal force, the extension rod 2243 extends when moving downwards, and the scraper 2244 pushes the impurities towards the dust collecting box 2253.

[0025] The collecting device 225 comprises a dust guide shell 2251, one side of the dust guide shell 2251 is provided with an air inlet 2252, one end of the dust guide shell 2251 is provided with a collecting box 2254, the collecting box 2254 is provided with a dust blocking hole, the upper portion of the dust guide shell 2251 is provided with a suction pipe 2255, one side of the suction pipe 2255 is provided with a dust collecting box 2253, the inside of the dust guide shell 2251 is provided with a contraction cavity 2256, a throat cavity 2257 and a diffusion cavity 2258 along the air flow direction, the suction pipe 2255 is communicated with the throat cavity 2257, and the diffusion cavity 2258 is communicated with the collecting box 2254. The air delivered by the centrifugal fan 6 enters the air inlet 2252, enters the contraction cavity 2256 through the air inlet 2252, when the air enters the throat cavity 2257, the air flow speed is accelerated, a negative pressure is formed in the suction pipe 2255, the impurities in the dust collecting box 2253 are sucked into the diffusion cavity 2258, and then enter the collecting box 2254 through the diffusion cavity 2258.

[0026] The gradient temperature rising device 24 comprises an outer frame 241, the outer frame 241 is installed in the inside of the shell 21, a guide vane 242 is rotatably installed in the inside of the outer frame 241, a first pinion 243 is installed at one end of the guide vane 242, a second pinion is rotatably installed above the outer frame 241, a belt 244 is installed outside the first pinion 243 and the second pinion, a third pinion 245 is installed at one side of the second pinion, and an adjusting device 246 is slidably installed on the outer frame 241.

[0027] The adjusting device 246 comprises a bimetallic block 2461 installed on the inner wall of the shell 21, one side of the bimetallic block 2461 is provided with a push rod, the push rod is rotatably provided with an amplification lever 2462, the inner wall of the shell 21 is provided with a support, the amplification lever 2462 rotates around the support, the other side of the amplification lever 2462 is rotatably provided with a sliding plate 2463, the sliding plate 2463 slides on the outer frame 241, the sliding plate 2463 is connected with a second gear rack, and the third pinion 245 is engaged with the second gear rack. When the temperature increases, the bimetallic block 2461 is heated and stretched, the bimetallic block 2461 drives the push rod to move away from the outer frame 241, the push rod 241 drives the amplification lever 2462 to rotate, the amplification lever 2462 drives the sliding plate 2463 to slide on the outer frame 241 and move close to the air outlet 3, the sliding plate 2463 drives the second gear rack to slide close to the air outlet 3, the third gear rack drives the third pinion 245 on the first outer frame 241 to rotate, the third pinion 245 drives the second pinion to rotate, the second pinion drives the belt 244 to rotate, the belt 244 drives the first pinion 243 to rotate, the first pinion 243 drives the guide vane 242 to rotate, the angle of the guide vane 242 is changed, the air flow is guided to flow through the heating area in different paths and speeds, as the temperature continues to rise, the bending degree of the bimetallic block 2461 becomes larger, the second gear rack gradually drives the third pinion 245 on the second outer frame 241 and the third outer frame 241 to rotate, so that the angle of the guide vane 242 on the second outer frame 241 and the third outer frame 241 is gradually changed, a low-to-high temperature gradient is realized, and the air flow presents a continuous temperature rising process when passing through the equipment, so that problems such as local overheating or cooling lag caused by temperature mutation are avoided.

[0028] Working principle of the present application: In work, the first motor 7 is controlled to start, the first motor 7 drives the centrifugal fan 6 to start, the centrifugal fan 6 inputs the air outside into the air inlet 4, the air enters into the shell 21 from the air inlet 4, and the impurities in the air are blocked by the filter plate 221; when the impurities accumulate on the filter plate 221, the ventilation volume of the filter plate 221 is reduced, the pressure on the side of the filter plate 221 close to the air outlet 3 is reduced, the pressure in the low-pressure cavity is reduced, the high-pressure bellows 2224 is compressed, the volume is reduced, the incompressible liquid in the high-pressure bellows 2224 enters the low-pressure bellows 2226 through the connecting pipe 2227, the low-pressure bellows 2226 is elongated, the volume is increased, the low-pressure bellows 2226 drives the connecting shaft 2228 to move away from the high-pressure cavity, and the low-pressure bellows 2226 drives the first gear rack 2229 to move away from the high-pressure cavity; when the temperature changes, the volume of the incompressible liquid changes due to the influence of temperature, the incompressible liquid in the high-pressure bellows 2224 enters and exits the temperature compensation bellows 2225 through the small hole, and the expansion and contraction of the temperature compensation bellows 2225 realizes the compensation of the temperature.

[0029] When the first rack 2229 moves, the first rack 2229 drives the gear wheel 2233 to rotate, at this time the pawl abuts against the ratchet wheel 2234, the gear wheel 2233 drives the ratchet wheel 2234 to rotate, the ratchet wheel 2234 drives the first rotating shaft 2231 to rotate, the first rotating shaft 2231 drives the clockwork spring to store energy, when the first rack 2229 moves to a predetermined threshold, the gear wheel 2233 is disengaged from the first rack 2229, the control energized spring is energized to retract, the energized spring drives the pawl to retract, and the rotation of the ratchet wheel 2234 is not affected, the clockwork spring drives the first rotating shaft 2231 to rotate, the first rotating shaft 2231 drives the first bevel gear 2235 to rotate, the first bevel gear 2235 drives the second bevel gear 2236 to rotate, the second bevel gear 2236 drives the second rotating shaft 2237 to rotate, the second rotating shaft 2237 drives the short rod 2241 to rotate, when the clockwork spring just starts to release energy, the short rod 2241 rotates rapidly, the short rod 2241 drives the extension rod 2243 to rotate, the extension rod 2243 moves away from the second rotating shaft 2237 under the action of centrifugal force, and impurities on the filter plate 221 are removed, when the clockwork spring releases energy for a period of time, the short rod 2241 rotates slowly, the short rod 2241 drives the extension rod 2243 to rotate, and since there is not enough centrifugal force, the extension rod 2243 retracts when moving to the upper side and extends when moving to the lower side, and the scraper 2244 pushes the impurities to the direction of the dust collection box 2253.

[0030] The air delivered by the centrifugal fan 6 enters the air inlet 2252, passes through the air inlet 2252 into the contraction cavity 2256, and when the air enters the throat cavity 2257, the air flow rate is accelerated, a negative pressure is formed in the adsorption pipe 2255, and the impurities in the dust collection box 2253 are sucked into the diffusion cavity 2258, pass through the diffusion cavity 2258 into the collection box 2254, and the gas is discharged through the dust blocking hole.

[0031] The electric heating tube 23 is started to generate heat, when the temperature increases, the bimetallic strip 2461 is stretched by heat, the bimetallic strip 2461 drives the push rod to move away from the outer frame 241, the push rod 241 drives the amplification lever 2462 to rotate, the amplification lever 2462 drives the sliding plate 2463 to slide on the outer frame 241 to the direction close to the air outlet 3, the sliding plate 2463 drives the second rack to slide to the direction close to the air outlet 3, the third rack drives the third pinion 245 on the first outer frame 241 to rotate, the third pinion 245 drives the second pinion to rotate, the second pinion drives the belt 244 to rotate, the belt 244 drives the first pinion 243 to rotate, the first pinion 243 drives the guide vane 242 to rotate, the angle of the guide vane 242 is changed, the airflow is guided to flow through the heating area in different paths and speeds, as the temperature continues to rise, the bending degree of the bimetallic strip 2461 becomes larger, the second rack gradually drives the third pinion 245 on the second outer frame 241 and the third outer frame 241 to rotate, the angle of the guide vane 242 on the second outer frame 241 and the third outer frame 241 is gradually changed, the temperature gradient from low to high is realized, the airflow presents a continuous temperature rising process when passing through the inside of the device, the problems such as local overheating or cooling lag caused by temperature mutation are avoided, and the heated air is discharged from the air outlet 3 to the outside.

[0032] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the application can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the application being defined by the appended claims rather than by the above description, and it is intended that all changes and modifications which come within the meaning and range of equivalency of the claims are resolvable thereunder. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. An air heater having a gradient heating function, characterized by: The air heater comprises a bottom plate (1), a heating device (2) is arranged above the bottom plate (1), an air outlet (3) is arranged on one side of the heating device (2), an air inlet (4) is arranged on the other side of the heating device (2), a centrifugal fan (6) is arranged on one side of the air inlet (4), a first motor (7) is arranged on one side of the centrifugal fan (6), first and second supports are arranged on the bottom plate (1), the centrifugal fan (6) is arranged on the first support, the first motor (7) is arranged on the second support, a junction box (5) is arranged above the heating device (2), and the junction box (5), the centrifugal fan (6) and the first motor (7) are connected to a control system.

2. The air heater having a gradient temperature increasing function according to claim 1, characterized in that: The heating device (2) comprises a shell (21), the shell (21) is arranged on the bottom plate (1), a dust removal device (22) is arranged in the shell (21), an electric heating tube (23) is arranged on one side of the dust removal device (22), a gradient temperature rising device (24) is arranged on one side of the electric heating tube (23), and the electric heating tube (23) and the gradient temperature rising device (24) are arranged in the shell (21). The electric heating tube (23) is connected to the control system.

3. The air heater with a gradient heating function according to claim 2, characterized in that: The dust removal device (22) comprises a filter plate (221), the filter plate (221) is arranged in the shell (21), a groove is arranged on the filter plate (221), a detection device (222) is arranged in the groove, a driving device (223) is arranged on one side of the detection device (222), a cleaning device (224) is arranged on the driving device (223), the cleaning device (224) is arranged on the filter plate (221), and a collecting device (225) is arranged on one side of the filter plate (221).

4. The air heater having a gradient temperature increasing function according to claim 3, characterized in that: The detection device (222) includes a sealed shell (2221), the sealed shell (2221) is installed in the recess, the inside of the sealed shell (2221) is provided with a high pressure cavity and a low pressure cavity, the high pressure cavity is located on one side of the filter plate (221), the low pressure cavity is located on the other side of the filter plate (221), the high pressure cavity and the low pressure cavity are provided with a connecting pipe (2227), one side of the sealed shell (2221) is provided with a high pressure pipeline (2222) and a low pressure pipeline (2223), the high pressure cavity and the high pressure pipeline (2222) are communicated, the low pressure cavity and the low pressure pipeline (2223) are communicated, the high pressure cavity is provided with a high pressure bellows (2224), one end of the high pressure bellows (2224) is installed on the cavity wall of the high pressure cavity, the other end of the high pressure bellows (2224) is provided with a temperature compensation bellows (2225), the high pressure bellows (2224) and the temperature compensation bellows (2225) are communicated through a small hole, the low pressure cavity is provided with a low pressure bellows (2226), one end of the low pressure bellows (2226) is installed on the cavity wall of the low pressure cavity, the other end of the low pressure bellows (2226) is provided with a first rack (2229), the high pressure bellows (2224) and the connecting pipe (2227) are communicated, the low pressure bellows (2226) and the connecting pipe (2227) are communicated, the high pressure bellows (2224) and the low pressure bellows (2226) are provided with a connecting shaft (2228).

5. The air heater having a gradient temperature increasing function according to claim 4, characterized in that: The driving device (223) includes a protective shell, the protective shell is installed on one side of the sealed shell (2221), the inside of the protective shell is provided with a clockwork box (2232), the first rotating shaft (2231) is rotatably installed in the inside of the clockwork box (2232), the clockwork spring is installed on the first rotating shaft (2231) and in the inside of the clockwork box (2232), the first rotating shaft (2231) is rotatably installed with a large gear (2233), the inside of the large gear (2233) is provided with a ratchet wheel (2234), the ratchet wheel (2234) is installed on the first rotating shaft (2231), the power spring is installed between the ratchet wheel and the large gear (2233), one end of the first rotating shaft (2231) is provided with a first bevel gear (2235), the second rotating shaft (2237) is rotatably installed on the filter plate (221), one end of the second rotating shaft (2237) is provided with a second bevel gear (2236), the first bevel gear (2235) and the second bevel gear (2236) are engaged, the other end of the second rotating shaft (2237) is provided with a cleaning device (224), the power spring is connected to the control system.

6. The air heater having a gradient temperature increasing function according to claim 5, characterized in that: The cleaning device (224) comprises a short rod (2241) mounted on the second rotating shaft (2237), one side of the short rod (2241) is connected with a limiting block (2242), a lengthening rod (2243) is slidingly mounted on the short rod (2241), the lengthening rod (2243) is internally provided with a sliding groove, the limiting block (2242) slides in the sliding groove, the outer side of the lengthening rod (2243) is connected with a scraper (2244), one end of the short rod (2241) is mounted with a second spring, one end of the second spring is mounted in the interior of the lengthening rod (2243).

7. The air heater having a gradient temperature increasing function according to claim 6, characterized in that: The collecting device (225) comprises a dust guide shell (2251), one side of the dust guide shell (2251) is mounted with an air inlet (2252), one end of the dust guide shell (2251) is mounted with a collecting box (2254), the collecting box (2254) is provided with a dust blocking hole, the upper portion of the dust guide shell (2251) is mounted with a suction pipe (2255), one side of the suction pipe (2255) is mounted with a dust collecting box (2253), the interior of the dust guide shell (2251) is provided with a contraction cavity (2256), a throat cavity (2257) and a diffusion cavity (2258) along the air flow direction, the suction pipe (2255) is in communication with the throat cavity (2257), the diffusion cavity (2258) is in communication with the collecting box (2254).

8. The air heater having a gradient temperature increasing function according to claim 7, characterized in that: The gradient temperature rising device (24) comprises an outer frame (241) mounted in the interior of the shell (21), a flow guide blade (242) is rotatably mounted in the interior of the outer frame (241), one end of the flow guide blade (242) is mounted with a first pinion (243), a second pinion is rotatably mounted above the outer frame (241), the outer sides of the first pinion (243) and the second pinion are mounted with a belt (244), one side of the second pinion is mounted with a third pinion (245), an adjusting device (246) is slidingly mounted on the outer frame (241).

9. The air heater having a gradient temperature increasing function according to claim 8, characterized in that: The adjusting device (246) comprises a bimetallic block (2461) mounted on the inner wall of the shell (21), one side of the bimetallic block (2461) is mounted with a push rod, the push rod is rotatably mounted with an amplification lever (2462), a support is mounted on the inner wall of the shell (21), the amplification lever (2462) rotates around the support, the other side of the amplification lever (2462) is rotatably mounted with a sliding plate (2463), the sliding plate (2463) slides on the outer frame (241), the sliding plate (2463) is connected with a second rack, the third pinion (245) is engaged with the second rack.

10. The air heater having a gradient temperature increasing function according to claim 9, characterized in that: The high-pressure bellows (2224), the temperature compensation bellows (2225), the low-pressure bellows (2226) and the connecting pipe (2227) are filled with incompressible liquid.

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