Industrial dryer

Abstract

The industrial drying machine comprises a heat source, a drying machine body, an air inducing device and a heat supply chamber, the heat supply chamber is arranged on the vertical upper portion of the drying machine body, and the air inducing device is installed on the outer side face of the drying machine body; the air inducing device introduces hot air generated by the heat source into the dryer body, and the heat source is installed in the heat supply chamber and is a metal fiber burner. The metal fiber combustor has the advantages that the gas cavity is large in size and stable in combustion, the air inducing device is matched with the heat supply chamber to well guide hot air, the drying efficiency is high, and drying objects are not damaged.

Description

Technical Field

[0001] The present application relates to the field of dryers, and in particular to an industrial dryer. Background Art

[0002] Industrial dryers have three major technical features: large batch processing work, long and stable operation time, and high work efficiency.

[0003] Related technology can refer to the Chinese patent publication number CN113983781A, which discloses a drum-type industrial dryer, including a main frame, a heat exchanger is arranged on the top of the main frame, and guard plates are arranged on the sides of the main frame to form a drying chamber inside the main frame, and the sides of the guard plates are connected to the fans; a drum is arranged in the middle of the main frame, a plurality of air holes are arranged on the sides of the drum, and a plurality of plate-like protrusions are evenly arranged on the inside; a drum mouth is arranged at one end of the drum, and a baffle is arranged at the other end, wherein an inclined plate is arranged at the drum mouth, and the two ends of the inclined plate are respectively connected to the plate-like protrusions and the drum mouth, so as to prevent the material from sliding toward the drum mouth; a power mechanism is connected to the axis of the baffle, and the power mechanism is fixed to the side of the main frame.

[0004] In view of the above-mentioned related technologies, a drum-type industrial dryer can automatically dry the materials. However, the heat source of the dryer in the above-mentioned related technologies adopts a heat exchanger, and the heat exchanger needs to provide an additional heat source, and there is a problem of heat loss in the heat transfer process. With the progress of industrialization, the society has higher and higher requirements for the three major technologies of industrial dryers. Industrial dryers with heat sources as heat exchangers are increasingly difficult to meet the needs. As an existing heat source technology, the metal fiber burner has the advantages of fast heating response, low heat loss and low use cost. However, under the hidden danger of flashback, the overall volume design of the metal fiber burner is relatively small. The largest metal fiber burner on the market has a width of no more than 160MM, and the volume of its gas cavity is less than 6 liters. The heat provided by a single small metal fiber burner does not meet the heat source requirements of the industrial dryer, and the metal fiber combustion of such a small volume combustion cavity in parallel has the problem of unstable gas pressure and accelerated flashback. Therefore, technical personnel in this field believe that a metal fiber burner with a large volume gas cavity that is anti-flashback is needed to meet the application scenarios of industrial dryers in the future. Summary of the invention

[0005] In order to solve the above technical problems, the present invention relates to a metal fiber burner with a large volume gas cavity that is anti-flashback and is applied in an industrial dryer, thereby meeting the application requirements of the metal fiber burner in the industrial dryer.

[0006] The present application provides an industrial dryer, which adopts the following technical solution: An industrial dryer comprises a heat source, a dryer body, an air induction device and a heating chamber, wherein the heating chamber is arranged vertically above the dryer body, an air induction device is installed on the outer side of the dryer body, and the air induction device introduces hot air generated by the heat source into the dryer body. The heat source is installed in the heating chamber, and is characterized in that the heat source is a metal fiber burner, and the metal fiber burner comprises a gas chamber, a metal fiber mesh, a gas mesh plate, a gas mixing plate, an air uniforming sheet, an igniter, an air intake branch pipe and a gas fan, and a gas inlet branch pipe is installed in the combustion chamber. An air inlet is arranged at the vertical bottom, and pressurized gas is introduced into the gas fan through the air inlet. A gas mesh plate and a metal fiber mesh are arranged in sequence vertically above the combustion chamber. A gas mixing plate is arranged in the combustion chamber. The combustion chamber is horizontally arranged in the heating chamber. The gas mixing plate is horizontally arranged in the combustion chamber. The coverage area of ​​the gas mixing plate is larger than the area of ​​the air inlet for introducing the gas. An air uniforming sheet is arranged outside the air inlet. The outlet end of the air inlet branch pipe extends to vertically above the metal fiber mesh, and an igniter is connected next to the outlet end of the air inlet branch pipe.

[0007] By adopting the above technical scheme, the heating chamber and the draft device are installed on the outer side of the dryer body, which can improve the space utilization rate of the industrial dryer. The metal fiber burner is installed in the heating chamber, which can effectively reduce the heat dissipation of the metal fiber burner. The gas mixing plate is arranged above the air inlet, which can effectively reduce the flow rate of the pressurized gas entering the gas chamber, and at the same time, the gas entering the gas chamber is evenly dispersed into the gas chamber. The air intake branch pipe diverts part of the gas in the air intake pipe, and then it is ignited by the igniter connected to the air outlet end of the air intake branch pipe, forming a constant flame when the industrial dryer is in working condition, thereby ensuring that the combustion chamber of the metal fiber burner continues to burn when the industrial dryer is in working condition.

[0008] Optionally, the air inlet is connected to an air inlet pipe, and a flange structure is provided on one end of the air inlet pipe close to the air inlet, and an air uniforming plate is installed on the flange structure. The air uniforming plate is provided with a plurality of evenly distributed through holes, and the opening direction of the through holes is consistent with the axial direction of the air inlet pipe. One end of the air inlet pipe extends to the interior of the heating chamber, and the other end of the air inlet pipe is located outside the heating chamber and connected to the gas blower.

[0009] By adopting the above technical scheme, an air-leveling sheet is sandwiched in the flange connecting the air inlet pipe and the air inlet of the gas chamber, so that the gas before entering the gas chamber has a uniform flow velocity distribution in the pipe cross-sectional area. The direction and uniformity of the through holes opened in the air-leveling sheet allow the gas to enter the gas chamber as far away from the pipe as possible, thereby increasing the flow velocity of the gas. The gas fan converts the natural gas mixed with air into gas that meets the user's requirements, and then inputs it into the gas chamber through the air inlet pipe.

[0010] Optionally, the gas mixing plate is fixedly connected to the vertical bottom of the gas chamber via a connecting piece, the connection position of the connecting piece avoids the air inlet, the connecting piece is located at both ends of the length extension direction of the gas mixing plate, and the distance between the gas mixing plate and the vertical bottom of the gas chamber accounts for two-thirds of the height between the gas mesh plate and the vertical bottom of the gas chamber.

[0011] By adopting the above technical solution, the gas mixing plate serves as a feature in the gas chamber, the purpose of which is to allow the gas entering the gas chamber to be fully dispersed before reaching the metal fiber mesh, and to minimize the meaningless leakage of the gas as the gas fills the entire combustion chamber. At the same time, the spatial position of the gas mixing plate also determines the duration of the gas pressure stabilization process in the gas chamber.

[0012] Optionally, the gas mixing plate further comprises two extended edges, the length extension direction of the gas mixing plate is consistent with the length extension direction of the gas chamber, the length extension direction of the extended edges is consistent with the length extension direction of the gas mixing plate, a non-zero angle is formed between the two extended edges and the width extension direction of the gas mixing plate, and the width extension direction of the extended edges tends to be close to the vertical bottom of the gas chamber.

[0013] By adopting the above technical solution, the gas mixing plate includes two extended edges, the purpose of which is to further enhance the working effect of the gas mixing plate in the gas chamber.

[0014] Optionally, an inclined transition plate is provided between the vertical bottom surface of the gas chamber and the two side surfaces in the width direction, a plurality of slots arranged side by side are provided on both sides of the length of the gas chamber, a pressure strip is provided on the outer side surface of the metal fiber mesh, plug-in ends are respectively extended at both ends of the length of the pressure strip, the plug-in ends are perpendicular to the extension direction of the length of the pressure strip, and the plug-in ends are inserted into the slots.

[0015] By adopting the above technical solution and setting an inclined transition plate, the gas flow velocity vector entering the gas chamber can have better stability, reduce the situation of gas flow velocity vector closed loop in the gas chamber, and enhance the gas pressure stability of the gas chamber. The pressure strip can limit the freedom of the spatial position of the metal fiber mesh. At the same time, the cooperation of the connecting ends and the slots at both ends of the length of the pressure strip can also enable the pressure strip to select a position within a certain interval at the upper end of the metal fiber mesh.

[0016] Optionally, the metal fiber burner further comprises a ventilation valve, an air inlet end of the ventilation valve is connected to an air pressure sensor on an air inlet pipe via a hose, and an air outlet end of the ventilation valve is connected to the air inlet pipe.

[0017] By adopting the above technical solution, pressurized gas enters the gas chamber when the industrial dryer is working. This process requires the use of a vent valve. When the gas reaches the vent valve position, the pressurized gas enters the air pressure sensor through a hose. After the sensor determines that the gas pressure through the intake pipe reaches the standard for opening the valve, the vent valve works, allowing the pressurized gas to enter the gas chamber through the intake pipe.

[0018] Optionally, the induced draft device includes an induced draft fan, an induced draft duct and an induced draft valve, wherein the induced draft fan, the induced draft duct and the induced draft valve are arranged on one side of the dryer body, and the induced draft fan provides traction for the hot air to flow downward for the industrial dryer. An opening is arranged vertically below the dryer body for being connected to a section of the induced draft duct, and the other end of the induced draft duct is connected to the induced draft valve.

[0019] By adopting the above technical solution, the induced draft fan, induced draft duct and induced draft valve are arranged on one side of the dryer body, so that the volume redundancy of the industrial dryer can be reduced. At the same time, when the induced draft fan is working, gas flow conditions will be formed inside the industrial dryer, and the air heated by the heat generated by the metal fiber burner in the industrial dryer will be drawn down to complete the drying work of the industrial dryer. At the same time, the use of the induced draft duct can increase the flow rate of the heated air.

[0020] Optionally, the heating chamber further comprises a combustion chamber, a shell, a cooling hole, a cold air hole, a working hole, a hot air cooling channel, an air supply port, a heat insulation board and a fire extinguishing board. The heating chamber is bounded by the shell, and the cooling hole, the cold air hole, the working hole and the air supply port are all arranged on the shell; the heat insulation board and the fire extinguishing board are both arranged inside the heating chamber, the heat insulation board is connected to the shell on both sides of the width direction of the heating chamber, and forms an angle with the vertical direction of the heating chamber, and the fire extinguishing board is connected to the shell on both sides of the width direction of the heating chamber The fire extinguishing plate is connected to the heat insulation board, forming an angle with the heat insulation board; in the process of the fire extinguishing plate moving from close to the cold air hole to far away from the cold air hole, the distance between the fire extinguishing plate and the vertical upper shell becomes farther and farther, the bottom of the heat insulation board is fixed to the vertical bottom of the heating chamber, and the top of the heat insulation board is connected to the end of the fire extinguishing board away from the cold air hole; the fire extinguishing board and the heat insulation board divide the heating chamber into two parts: a combustion chamber and a hot air cooling channel, the metal fiber burner is arranged in the combustion chamber, and the metal fiber burner enters the combustion chamber through the working hole.

[0021] By adopting the above technical scheme, the heat insulation board and the fire extinguishing board in the heating chamber divide the internal space of the heating chamber into two sides, one side is the combustion chamber, and the other side is the hot air cooling channel, wherein the side where the metal fiber burner is arranged is the combustion chamber, and the heat insulation board and the shell serve as the solid boundary of the heat dissipation of the metal fiber burner, and the air heated by the metal fiber burner enters the hot air cooling channel through the fire extinguishing board, and the fire extinguishing board can extinguish the open flame of the gas ignited by the metal fiber burner to ensure that no open flame or spark enters the hot air cooling channel, and the "fire extinguishing board is in the process of moving from close to the cold air hole to far away from the cold air hole, and the distance between the fire extinguishing board and the vertical upper shell becomes farther and farther, and the bottom of the heat insulation board is fixed to the vertical bottom of the heating chamber, and the top of the heat insulation board is connected to the end of the fire extinguishing board away from the cold air hole" has the effect of designing the hot air cooling channel into a fluid channel that can introduce cold air into the channel to cool the hot air and reduce the speed as quickly as possible during the downward process of the hot air.

[0022] Optionally, the cold air hole is opened at the vertical top of the heating chamber and is away from the end where the insulation plate and the fire extinguishing plate intersect; the cooling hole is located vertically below the combustion chamber and close to one end of the metal fiber burner; the air supply port is located at the vertical bottom of the heating chamber and is away from the cooling hole; a ventilation hole is opened on the side of the dryer body that contacts the heating chamber, and the ventilation hole is connected to and passes through the hot air cooling channel.

[0023] By adopting the above technical scheme, the cold air hole is opened at the vertical top of the heating chamber. By cooperating with the hot air cooling channel, it can be ensured that the cold air is smoothly introduced into the hot air cooling channel and heated by the heat gushing out from the fire extinguishing plate. After being heated, the cold air flows downward along the hot air cooling channel and enters the main body of the industrial dryer through the ventilation hole opened on the side where the dryer body contacts the heating chamber to complete the drying work. Since the combustion chamber works in a relatively closed combustion chamber, the temperature in the combustion chamber needs to be controlled below the ignition point of the gas. Therefore, the cooling hole is arranged on the side close to the metal fiber burner to ensure the operating safety of the metal fiber burner in the combustion chamber.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. By adopting the above technical solution, it can ensure that the metal fiber burner as a heat source can work continuously and stably under the condition of stable gas pressure, and there is no need to worry about flashback when the gas chamber space is large; 2. By adopting the above technical solution, it can ensure that the gas enters the air inlet pipe after being pressurized, and the vent valve detects whether the gas pressure meets the opening conditions, ensuring that the gas entering the gas chamber has a sufficiently high pressure to prevent the metal fiber burner from failing to ignite, leaking, backfiring and flameout; 3. The metal fiber burner has a larger combustion area and provides more heat; 4. The cold air enters the hot air cooling channel through the upper end of the combustion chamber and is heated. At the same time, the heated hot air is introduced into the industrial dryer body from the hot air cooling channel by the air induced device. Since the heated hot air has a sufficiently long distance and circulation time in the hot air cooling channel, the temperature of the hot air will not cause damage to the drying object while meeting the drying work. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an axonometric view of an industrial dryer.

[0026] Figure 2 It is a rear axonometric cutaway view of an industrial dryer.

[0027] Figure 3 It is an axial view of a metal fiber burner.

[0028] Figure 4 It is an axial cross-sectional view of a metal fiber burner.

[0029] Explanation of the reference numerals: 1. heat source; 2. dryer body; 3. induced draft device; 4. heating chamber; 10. metal fiber burner; 11. fuel gas chamber; 12. air inlet pipe; 13. metal fiber mesh; 14. gas mesh plate; 15. gas mixing plate; 16. connecting piece; 17. vent valve; 18. air uniforming sheet; 19. pressure strip; 110. extension edge; 111. transition plate; 112. igniter; 113. air inlet branch pipe; 114. gas fan; 31. induced draft fan; 32. induced draft duct; 33. induced draft valve; 41. combustion chamber; 42. cooling hole; 43. cold air hole; 44. heat insulation board; 45. fire extinguishing board; 46. hot air cooling channel; 47. air supply port; 48. shell; 49. working hole. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0031] The present application embodiment discloses an industrial dryer. However, the embodiments of the present disclosure can be modified in a variety of different forms, and the scope of the present disclosure should not be interpreted as being limited by the embodiments described below. It is expected that the embodiments of the present disclosure will be interpreted as providing a more complete explanation of the present disclosure to those skilled in the art. Throughout the specification and the drawings, the same reference numerals indicate the same elements. In addition, various elements and regions are schematically drawn in the drawings. Therefore, the concept of the present disclosure is not limited by the relative sizes or spacings drawn in the drawings.

[0032] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meanings as those generally understood by those of ordinary skill in the art to which the concept of the present disclosure belongs. It will be understood that common terms defined in dictionaries will be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and unless explicitly defined herein, these terms should not be interpreted in an overly formal sense.

[0033] Reference Figure 1 , Figure 2 and Figure 4 An industrial dryer includes a heat source 1, a dryer body 2, an air induction device 3 and a heating chamber 4. The heating chamber 4 is arranged vertically above the dryer body 2. The air induction device 3 is installed on the outer side of the dryer body 2. The air induction device 3 introduces the hot air generated by the heat source 1 into the dryer body 2. The heat source 1 is installed in the heating chamber 4. The heat source 1 is a metal fiber burner 10. The metal fiber burner 10 includes a gas chamber 11, a metal fiber mesh 13, a gas mesh plate 14, a gas mixing plate 15, an air uniforming sheet 18, an igniter 112, an air intake branch pipe 113 and a gas fan 114. An air inlet is arranged at the vertical bottom of the combustion chamber, and a gas fan 114 introduces pressurized gas through the air inlet. A gas mesh plate 14 and a metal fiber mesh 13 are arranged in sequence vertically above the combustion chamber. A gas mixing plate 15 is arranged in the combustion chamber. The combustion chamber is horizontally arranged in the heating chamber 4. The gas mixing plate 15 is horizontally arranged in the combustion chamber. The coverage area of ​​the gas mixing plate 15 is larger than the area of ​​the air inlet for introducing the gas. An air uniforming sheet 18 is arranged outside the air inlet. The outlet end of the air inlet branch pipe 113 extends to vertically above the metal fiber mesh 13, and the outlet end of the air inlet branch pipe 113 is connected to an igniter 112.

[0034] The heating chamber 4 and the draft device 3 are installed on the outer side of the dryer body 2, which can improve the space utilization rate of the industrial dryer. The metal fiber burner 10 is installed in the heating chamber 4, which can effectively reduce the heat dissipation of the metal fiber burner 10. The gas mixing plate 15 is placed above the air inlet, which can effectively reduce the flow rate of the pressurized gas entering the gas chamber 11. The metal fiber burner 10 of the present invention belongs to a plate-type metal fiber burner 10 in terms of technical solution. The main working feature of this technical solution is that the gas is orderly dissipated through a metal fiber mesh 13 with no connection to one side boundary, and ignited by an open flame or a high-temperature electric arc. For related technologies, please refer to patent announcement No. CN217031187U The metal fiber burner 10 for the fully premixed low-nitrogen condensing boiler in the present invention has an innovation point that it solves the problem of flashback caused by the inability to stably maintain the gas pressure after the volume of the gas chamber 11 increases. Compared with the prior art, the volume of the gas chamber 11 can be increased from less than 6 liters to 7 liters-28 liters. The gas mixing plate 15 evenly disperses the gas entering the gas chamber 11 into the gas chamber 11, and at the same time, the air intake branch pipe 113 diverts part of the gas in the air intake pipe 12, which is then ignited by the igniter 112 connected to the air outlet end of the air intake branch pipe 113 to form a constant flame under the working state of the industrial dryer, thereby ensuring that the combustion chamber of the metal fiber burner 10 continues to burn when the industrial dryer is in working state.

[0035] like Figure 1 and Figure 4 As shown, the air inlet is connected to an air inlet pipe 12, and a flange structure is provided on one end of the air inlet pipe 12 close to the air inlet, and an air uniforming sheet 18 is installed on the flange structure. The air uniforming sheet 18 is provided with a plurality of evenly distributed through holes, and the opening direction of the through holes is consistent with the axial direction of the air inlet pipe 12. One end of the air inlet pipe 12 extends to the interior of the heating chamber 4, and the other end of the air inlet pipe 12 is located outside the heating chamber 4 and is connected to the gas blower 114.

[0036] The function of the air-leveling plate 18 is to force the gas to roughly evenly distribute the flow velocity of the pipe cross-section in the air intake pipe 12 before it enters the gas chamber 11. The reason is that the volume velocity vector of the pressurized gas is unknown when it enters the gas chamber 11 from the air intake pipe 12. The direction and uniformity of the through holes opened in the air-leveling plate 18 allow the gas to enter the gas chamber 11 as far away from the pipe as possible, thereby increasing the flow velocity of the gas. The gas blower 114 is the only active power device of the metal fiber burner 10. Its purpose is to mix and pressurize natural gas with air to form pressurized gas that meets the user's requirements, and then input it into the gas chamber 11 through the air intake pipe 12.

[0037] like Figure 4As shown, the gas mixing plate 15 is fixedly connected to the vertical bottom of the gas chamber 11 through a connector 16. The connection position of the connector 16 avoids the air inlet. The connector 16 is located at both ends of the length extension direction of the gas mixing plate 15, and the distance between the gas mixing plate 15 and the vertical bottom of the gas chamber 11 accounts for two-thirds of the height between the gas mesh plate 14 and the vertical bottom of the gas chamber 11.

[0038] The gas mixing plate 15 is a structural feature in the gas chamber 11. Its purpose is to make the gas entering the gas chamber 11 fully dispersed before reaching the metal fiber mesh 13, and the gas flows from the bottom of the gas chamber 11 to the metal fiber mesh 13. Therefore, in the process of the gas filling the entire combustion chamber, the gas mixing plate 15 can reduce the meaningless leakage of the gas. At the same time, the spatial position of the gas mixing plate 15 also determines the duration of the gas pressure stabilization process in the gas chamber 11.

[0039] like Figure 4 As shown, the gas mixing plate 15 further includes two extension edges 110, the length extension direction of the gas mixing plate 15 is consistent with the length extension direction of the gas chamber 11, the length extension direction of the extension edge 110 is consistent with the length extension direction of the gas mixing plate 15, the two extension edges 110 and the width extension direction of the gas mixing plate 15 are provided with a non-zero angle, and the width extension direction of the extension edge 110 tends to be close to the vertical bottom of the gas chamber 11. The two extension edges 110 included in the gas mixing plate 15 are intended to further enhance the working effect of the above-mentioned gas mixing plate 15 in the gas chamber 11.

[0040] like Figure 4 As shown, inclined transition plates 111 are respectively provided between the vertical bottom surface of the gas chamber 11 and the two side surfaces in the width direction, and a plurality of slots arranged side by side are opened on both sides of the length of the gas chamber 11. A pressure strip 19 is provided on the outer side surface of the metal fiber mesh 13, and plug-in ends are respectively extended at both ends of the length of the pressure strip 19, and the plug-in ends are perpendicular to the length extension direction of the pressure strip 19, and the plug-in ends are inserted into the slots.

[0041] By setting an inclined transition plate 111, the velocity gradient of the gas entering the gas chamber 11 in the direction perpendicular to the transition plate 111 can be clear, and the velocity vector in each gradient has good stability, thereby reducing the situation where the velocity vector of the gas in the gas chamber 11 has a closed loop, and enhancing the gas pressure stability in the gas chamber 11. The pressure strip 19 can limit the freedom of the spatial position of the metal fiber mesh 13. At the same time, the cooperation of the connecting ends and the slots at both ends of the length of the pressure strip 19 can also enable the pressure strip 19 to select a position within a certain interval at the upper end of the metal fiber mesh 13.

[0042] like Figure 1 , Figure 3 and Figure 4 As shown, the metal fiber burner 10 further includes a ventilation valve 17 , an air inlet end of the ventilation valve 17 is connected to an air pressure sensor on the air inlet pipe 12 through a hose, and an air outlet end of the ventilation valve 17 is connected to the air inlet pipe 12 .

[0043] When the industrial dryer is working, the pressurized gas enters the gas chamber 11. This process needs to be achieved through the vent valve 17. When the gas reaches the position of the vent valve 17, the pressurized gas enters the air pressure sensor through the hose. After the sensor determines that the gas pressure through the intake pipe 12 reaches the standard for opening the valve, the vent valve 17 works, allowing the pressurized gas to enter the gas chamber 11 through the intake pipe 12.

[0044] like Figure 1 As shown, the induced draft device 3 includes an induced draft fan 31, an induced draft duct 32 and an induced draft valve 33. The induced draft fan 31, the induced draft duct 32 and the induced draft valve 33 are arranged on one side of the dryer body 2. The induced draft fan 31 provides traction for the downward movement of hot air for the industrial dryer. An opening is provided vertically below the dryer body 2 for being connected to a section of the induced draft duct 32. The other end of the induced draft duct 32 is connected to the induced draft valve 33.

[0045] The induced draft fan 31, induced draft duct 32 and induced draft valve 33 are arranged on one side of the dryer body 2, so that the volume redundancy of the industrial dryer can be reduced. At the same time, when the induced draft fan 31 is working, gas flow conditions will be formed inside the industrial dryer, and the air heated by the heat generated by the metal fiber burner 10 in the industrial dryer will be drawn down to complete the drying work of the industrial dryer. At the same time, the use of the induced draft duct 32 can increase the flow rate of the heated air.

[0046] like Figure 1 and Figure 2As shown, the heating chamber 4 also includes a combustion chamber 41, a shell 48, a cooling hole 42, a cold air hole 43, a working hole 49, a hot air cooling channel 46, an air supply port 47, a heat insulation board 44 and a fire extinguishing board 45. The heating chamber 4 is bounded by the shell 48. The cooling hole 42, the cold air hole 43, the working hole 49 and the air supply port 47 are all arranged on the shell 48; the heat insulation board 44 and the fire extinguishing board 45 are both arranged inside the heating chamber 4. The heat insulation board 44 is connected to the shell 48 on both sides of the width direction of the heating chamber 4, and forms an angle with the vertical direction of the heating chamber 4. The fire extinguishing board 45 is connected to the shell 48 on both sides of the width direction of the heating chamber 4. 48 is connected to form an angle with the heat insulation plate 44; in the process of the fire extinguishing plate 45 moving from close to the cold air hole 43 to far away from the cold air hole 43, the distance between the fire extinguishing plate 45 and the vertical upper shell 48 becomes farther and farther, the bottom of the heat insulation plate 44 is fixed to the vertical bottom of the heating chamber 4, and the top of the heat insulation plate 44 is connected to the end of the fire extinguishing plate 45 away from the cold air hole 43; the fire extinguishing plate 45 and the heat insulation plate 44 separate the heating chamber 4 into two parts, a combustion chamber 41 and a hot air cooling channel 46, the metal fiber burner 10 is arranged in the combustion chamber 41, and the metal fiber burner 10 enters the combustion chamber 41 through the working hole 49.

[0047] The heat insulation board 44 and the fire extinguishing board 45 in the heating chamber 4 divide the internal space of the heating chamber 4 into two sides, one side is the combustion chamber 41, and the other side is the hot air cooling channel 46, wherein the side where the metal fiber burner 10 is arranged is the combustion chamber 41, and the heat insulation board 44 and the shell 48 serve as the solid boundary of the heat dissipation of the metal fiber burner 10, and the air heated by the metal fiber burner 10 enters the hot air cooling channel 46 through the fire extinguishing board 45, and the fire extinguishing board 45 can extinguish the gas open flame ignited by the metal fiber burner 10, ensuring that no open flame or spark enters the hot air cooling channel 46, "the In the process that the fire extinguishing plate 45 moves from close to the cold air hole 43 to far away from the cold air hole 43, the distance between the fire extinguishing plate 45 and the vertical upper shell 48 becomes farther and farther, the bottom of the heat insulation plate 44 is fixed to the vertical bottom of the heating chamber 4, and the top of the heat insulation plate 44 is connected to the end of the fire extinguishing plate 45 away from the cold air hole 43. The function of "the hot air cooling channel 46 is to design a fluid channel that can guide the cold air from the cold air hole 43 into the channel, heat the cold air to hot air near the cold air hole 43, and in the process of moving away from the cold air hole 43, the volume of the hot air expands while the flow rate and temperature of the hot air decrease at the same time.

[0048] like Figure 2As shown, the cold air hole 43 is opened at the vertical top of the heating chamber 4, and is far away from the end where the insulation board 44 and the fire extinguishing board 45 intersect; the cooling hole 42 is located vertically below the combustion chamber 41 and close to one end of the metal fiber burner 10; the air supply port 47 is located at the vertical bottom of the heating chamber 4, and the air supply port 47 is far away from the cooling hole 42; the side of the dryer body 2 in contact with the heating chamber 4 is provided with a ventilation hole, and the ventilation hole is connected to and penetrates the hot air cooling channel 46.

[0049] In the process of cold air entering the hot air cooling channel 46 from the cold air hole 43, the cold air is first heated and then cooled. When the working temperature is reached, the cold air enters the main body of the industrial dryer through the ventilation hole opened on the side where the dryer body 2 contacts the heating chamber 4 to complete the drying work. Since the combustion chamber works in a relatively closed combustion chamber 41, the temperature in the combustion chamber 41 needs to be controlled below the ignition point of the gas. Therefore, the cooling hole 42 is arranged on the side close to the metal fiber burner 10 to ensure the operating safety of the metal fiber burner 10 in the combustion chamber 41.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An industrial dryer, comprising a heat source (1), a dryer body (2), an air induction device (3) and a heating chamber (4), wherein the heating chamber (4) is arranged vertically above the dryer body (2), the air induction device (3) is installed on the outer side of the dryer body (2), the air induction device (3) introduces hot air generated by the heat source (1) into the dryer body (2), the heat source (1) is installed in the heating chamber (4), characterized in that: The heat source (1) is a metal fiber burner (10), and the metal fiber burner (10) comprises a combustion chamber (11), a metal fiber mesh (13), a gas mesh plate (14), a gas mixing plate (15), a gas homogenizing plate (18), an igniter (112), an air intake branch pipe (113) and a gas blower (114). An air intake port is arranged at the vertical bottom of the combustion chamber (11), and the gas blower (114) introduces pressurized combustion gas through the air intake port. The gas mesh plate (14) and the metal fiber burner (10) are arranged in sequence vertically above the combustion chamber (11). A metal fiber mesh (13) is provided in the gas chamber (11), the gas chamber (11) is horizontally arranged in the heating chamber (4), the gas mixing plate (15) is horizontally arranged in the gas chamber (11), the coverage area of ​​the gas mixing plate (15) is larger than the area of ​​the air inlet for introducing the gas, an air uniforming sheet (18) is arranged outside the air inlet, the outlet end of the air inlet branch pipe (113) extends to the vertical upper part of the metal fiber mesh (13), and the outlet end of the air inlet branch pipe (113) is connected to an igniter (112) next to the outlet end.

2. An industrial dryer according to claim 1, characterized in that: The air inlet is connected to an air inlet pipe (12), a flange structure is provided on one end of the air inlet pipe (12) close to the air inlet, an air leveling plate (18) is installed on the flange structure, the air leveling plate (18) is provided with a plurality of evenly distributed through holes, the opening direction of the through holes is consistent with the axial direction of the air inlet pipe (12), one end of the air inlet pipe (12) extends to the interior of the heating chamber (4), and the other end of the air inlet pipe (12) is located outside the heating chamber (4) and is connected to the gas blower (114).

3. An industrial dryer according to claim 1, characterized in that: The gas mixing plate (15) is fixedly connected to the vertical bottom of the gas chamber (11) via a connecting piece (16); the connecting position of the connecting piece (16) avoids the gas inlet; the connecting piece (16) is located at both ends of the gas mixing plate (15) in the direction of length extension; and the distance between the gas mixing plate (15) and the vertical bottom of the gas chamber (11) accounts for two thirds of the height between the gas mesh plate (14) and the vertical bottom of the gas chamber (11).

4. An industrial dryer according to claim 1, characterized in that: The gas mixing plate (15) further comprises two extended edges (110); the length extension direction of the gas mixing plate (15) is consistent with the length extension direction of the gas chamber (11); the length extension direction of the extended edge (110) is consistent with the length extension direction of the gas mixing plate (15); a non-zero angle is formed between the two extended edges (110) and the width extension direction of the gas mixing plate (15); the width extension direction of the extended edge (110) tends to be close to the vertical bottom of the gas chamber (11).

5. An industrial dryer according to claim 1, characterized in that: Inclined transition plates (111) are respectively provided between the vertical bottom surface and the two side surfaces in the width direction of the gas chamber (11); a plurality of slots arranged side by side are provided on both sides of the length of the gas chamber (11); a pressure strip (19) is provided on the outer side surface of the metal fiber mesh (13); plug-in ends are respectively extended at both ends of the length of the pressure strip (19); the plug-in ends are perpendicular to the length extension direction of the pressure strip (19), and the plug-in ends are inserted into the slots.

6. An industrial dryer according to claim 1, characterized in that: The metal fiber burner (10) further comprises a ventilation valve (17), the air inlet end of the ventilation valve (17) being connected to an air pressure sensor on an air inlet pipe (12) via a hose, and the air outlet end of the ventilation valve (17) being connected to the air inlet pipe (12).

7. An industrial dryer according to claim 1, characterized in that: The induced draft device (3) comprises an induced draft fan (31), an induced draft duct (32) and an induced draft valve (33). The induced draft fan (31), the induced draft duct (32) and the induced draft valve (33) are arranged on one side of the dryer body (2). The induced draft fan (31) provides traction force for hot air to flow downward for the industrial dryer. An opening is arranged vertically below the dryer body (2) for connecting to a section of the induced draft duct (32). The other end of the induced draft duct (32) is connected to the induced draft valve (33).

8. An industrial dryer according to claim 1, characterized in that: The heating chamber (4) further comprises a combustion chamber (41), a shell (48), a cooling hole (42), a cold air hole (43), a working hole (49), a hot air cooling channel (46), an air supply port (47), a heat insulation board (44) and a fire extinguishing board (45); the heating chamber (4) is bounded by the shell (48); the cooling hole (42), the cold air hole (43), the working hole (49) and the air supply port (47) are all arranged on the shell (48); the heat insulation board (44) and the fire extinguishing board (45) are both arranged inside the heating chamber (4); the heat insulation board (44) is connected to the shell (48) on both sides of the width direction of the heating chamber (4) and forms an angle with the vertical direction of the heating chamber (4); the fire extinguishing board (45) is connected to the shell (48) on both sides of the width direction of the heating chamber (4) and forms an angle with the vertical direction of the heating chamber (4); The fire extinguishing plate (45) is connected to the shell (48) and forms an angle with the heat insulation plate (44); in the process of the fire extinguishing plate (45) moving from close to the cold air hole (43) to far away from the cold air hole (43), the distance between the fire extinguishing plate (45) and the shell (48) vertically above becomes farther and farther, the bottom of the heat insulation plate (44) is fixed to the vertical bottom of the heating chamber (4), and the top of the heat insulation plate (44) is connected to an end of the fire extinguishing plate (45) far away from the cold air hole (43); the fire extinguishing plate (45) and the heat insulation plate (44) divide the heating chamber (4) into two parts, namely, a combustion chamber (41) and a hot air cooling channel (46); the metal fiber burner (10) is arranged in the combustion chamber (41), and the metal fiber burner (10) enters the combustion chamber (41) through the working hole (49).

9. An industrial dryer according to claim 8, characterized in that: The cold air hole (43) is provided at the vertical top of the heating chamber (4) and is away from the end where the heat insulation board (44) and the fire extinguishing board (45) intersect; the cooling hole (42) is located vertically below the combustion chamber (41) and close to one end of the metal fiber burner (10); the air supply port (47) is located at the vertical bottom of the heating chamber (4), and the air supply port (47) is away from the cooling hole (42); a ventilation port is provided on the side of the dryer body (2) that contacts the heating chamber (4), and the ventilation port is connected to and communicates with the hot air cooling channel (46).

Images