A hot air generating device for a low-temperature tempering furnace

Abstract

The present invention relates to the field of industrial heating, and particularly to a hot air generating device for a low-temperature tempering furnace. The technical problem to be solved is to overcome the disadvantages of waste of heat from exhaust gas and unstable hot air temperature. The technical solution is as follows: It includes a first housing, a second housing is fixedly connected to one side of the first housing in a communicating manner, an air outlet is provided on one side of the second housing, an installation hole is provided on the other side of the first housing, and a T-shaped cylinder is fixedly connected to one end of the installation hole. A high-speed nozzle is fixedly connected to one end of the T-shaped cylinder, a heat insulation plate is sleeved outside the high-speed nozzle, and a spark head is arranged on one side of the high-speed nozzle. The beneficial effect of the present invention is that the direction of the exhaust gas is guided by the wind baffle and the diversion plate, the combustible substances in the exhaust gas are ignited at the high-speed nozzle through the spiral air passage of the ventilation ring, the basic temperature of the fuel gas and the combustion-supporting agent is increased by using the heat of the exhaust gas itself, the fuel gas required to generate high-temperature gas is reduced, and the utilization rate of the fuel gas is improved.

Description

Technical Field

[0001] The present invention relates to the field of industrial heating, and in particular to a hot air generating device for a low-temperature tempering furnace. Background Art

[0002] Tempering is a post-treatment process for metals. By slowly cooling metal parts at a specific temperature, different crystal lattices are formed to improve the toughness of the metals. Among them, hot air heating has the best effect. For large-scale tempering furnaces, the existing technology is fuel combustion heating. Heat is generated by burning fuel in a combustion chamber, and then the heat is applied to the tempering furnace. Some hot air generating devices will also re-input the heat of the exhaust gas into the tempering furnace through heat transfer. However, the exhaust gas often contains incompletely burned gases and other combustibles, resulting in waste of resources. Moreover, the existing hot air generating devices cannot ensure the stability of the hot air temperature, thus affecting the quality of parts during tempering. Summary of the Invention

[0003] In order to overcome the disadvantages of heat waste of exhaust gas and unstable hot air temperature, the present invention provides a hot air generating device for a low-temperature tempering furnace that can improve the combustion efficiency.

[0004] The technical solution is as follows: A hot air generating device for a low-temperature tempering furnace includes a first housing. One side of the first housing is connected and fixed in a communicating manner with a second housing. An air outlet is provided on one side of the second housing. An installation hole is provided on the other side of the first housing, and a T-shaped cylinder is fixed at one end of the installation hole. A high-speed nozzle is fixed at one end of the T-shaped cylinder. A heat insulation plate is sleeved outside the high-speed nozzle, and a spark head is arranged on one side of the high-speed nozzle. The high-speed nozzle penetrates through the installation hole. It also includes a temperature control unit and an exhaust gas recovery unit. The temperature control unit is installed inside the second housing, and the exhaust gas recovery unit is installed at the left end inside the first housing. The exhaust gas recovery unit is used for burning exhaust gas.

[0005] The temperature control unit includes a centrifugal frame. The centrifugal frame is rotatably connected inside the second housing. A plurality of rectangular sliding grooves are circumferentially distributed on one side of the centrifugal frame. A slider is slidably connected in the rectangular sliding groove. A variable-diameter conical spring is connected between the slider and the rectangular sliding groove. A connecting rod is rotatably connected to one side of the slider. One ends of a plurality of connecting rods are rotatably connected to a rotating ring.

[0006] Preferably, the temperature control unit further includes blades. A plurality of blades are circumferentially distributed and fixed inside the centrifugal frame. A plurality of blades are commonly fixed with a centering column. One side of the top of the centrifugal frame is in contact with a damping adjustment unit. The damping adjustment unit is installed on the upper part inside the second housing.

[0007] Preferably, the temperature control unit further includes a positioning ring. One end of the rotating ring is rotatably connected to the positioning ring. The positioning ring is fixedly connected to a first air inlet cylinder through a plurality of connecting columns. The outer circumference of the first air inlet cylinder is provided with through-type first air inlet grooves in a circumferential distribution. A second air inlet cylinder is slidably connected to the outside of the first air inlet cylinder. A second air inlet groove is provided on the outside of the second air inlet cylinder corresponding to the first air inlet groove. A first spring is connected between the first air inlet cylinder and the second air inlet cylinder.

[0008] Preferably, the temperature control unit further includes an air duct box. The air duct box is fixedly connected inside the first housing. A blower hole is provided at the bottom of the first housing. The blower hole is communicated with the air duct box. The second air inlet cylinder is located inside the air duct box. One end of the air duct box is fixedly connected to a heat insulation sleeve. The heat insulation sleeve is located at the inner wall of the second housing. A concave air box is fixedly connected to the inner side of the heat insulation sleeve. An installation piston is slidably connected in the concave air box in a sealed manner. One end of the installation piston is clamped with a damping column. The damping column contacts the centrifugal frame.

[0009] Preferably, the temperature control unit further includes a first metal plate and a second metal plate. The blade is welded and synthesized by the first metal plate and the second metal plate.

[0010] Preferably, the damping adjustment unit includes a gas blocking head and a hydraulic piston. A gas blocking head is slidably connected through one side of the concave air box in a through-type manner. A hydraulic piston is fixedly connected to the side of the concave air box opposite to the gas blocking head. A second spring is connected between the hydraulic piston and the gas blocking head. An air inlet hole is provided on one side of the concave air box. The air inlet hole penetrates through the heat insulation sleeve through a first hose and is communicated with the air duct box.

[0011] Preferably, the damping adjustment unit further includes a hydraulic cylinder. The hydraulic cylinder is fixedly connected through the top of the second housing in a through-type manner. The outside of the hydraulic cylinder is fixedly connected to the heat insulation sleeve. A second hose is communicated between one end of the hydraulic cylinder and the hydraulic piston. A screw piston head is threadedly connected in the hydraulic cylinder. A hand valve is fixedly connected to one end of the screw piston head.

[0012] Preferably, the waste gas recovery unit includes a waste gas pipe. The waste gas pipes are fixedly connected through the top and bottom of the inside of the first housing in a through-type manner. A ventilation ring is fixedly connected in a communicating manner between the waste gas pipes. The ventilation ring is sleeved outside the high-speed nozzle. Spiral air ducts are circumferentially distributed and provided on the inner side of the ventilation ring. One end of the ventilation ring is fixedly connected to the second air inlet cylinder.

[0013] Preferably, the waste gas recovery unit further includes a wind baffle and a deflector. Wind baffles are fixedly connected to the ventilation ring near the waste gas pipes. Deflectors are provided between the spiral air ducts inside the ventilation ring. The deflectors at the uppermost and lowermost positions are respectively fixedly connected to the wind baffles.

[0014] Preferably, a chamfer is provided at one end of the inner side of the second air inlet cylinder close to the ventilation ring, and the chamfer taper is small.

[0015] Advantages of the present invention: 1. The present invention controls the movement of the slider through the centrifuge frame, controls the intake size of the first intake cylinder through the connecting rod, and controls the rotation speed of the centrifuge frame through the damping column, enabling the operator to control the temperature of the low-temperature gas by changing the pressure of the damping column. Moreover, when the damping column is worn, it can be promptly pushed by the gas in the air duct box, ensuring the stability of the temperature control by the damping column.

[0016] 2. The present invention guides the direction of the waste gas through the wind shield and the deflector, ignites the combustible substances in the waste gas at the high-speed nozzle through the spiral air duct of the ventilation ring, utilizes the chemical energy released by the ignition of the waste gas to further improve the utilization effect of the waste gas, and utilizes the heat of the waste gas itself to increase the base temperature of the fuel gas and the combustion-supporting agent, reducing the heat waste of the waste gas and the pollution caused by the waste gas to the environment, and reducing the fuel gas required to generate high-temperature gas, thus improving the utilization rate of the fuel gas.

[0017] 3. The present invention pressurizes and accelerates the high-temperature gas after combustion by utilizing the chamfer of the second intake cylinder, enabling the high-temperature gas to attract more high-pressure cold flow to mix with it when flowing, improving the cooling efficiency of the high-temperature gas. The inclination direction of the first intake groove is the same as the flow direction of the high-temperature gas, reducing the obstructive effect on the flow of the high-temperature gas when the high-pressure cold flow enters, preventing the high-speed nozzle from obstructing the ejection of the fuel gas, and improving the combustion efficiency of the fuel gas.

[0018] 4. The present invention controls the shape of the blade through the different thermal expansion coefficients of the first metal plate and the second metal plate, thereby controlling the rotation speed of the centrifuge frame. The rotation speed of the centrifuge frame directly affects the movement trajectory of the slider, causing changes in the positions of the rotating ring, the positioning ring, and the first intake cylinder, and further affecting the flow rate of the high-pressure cold flow, achieving the effect of self-adaptive adjustment of the temperature of the low-temperature gas, preventing the low-temperature gas from being too cold or too hot, and improving the temperature stability of the low-temperature gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present invention;

[0020] Figure 2 is a half-sectional view of the first housing of the present invention;

[0021] Figure 3 is a half-sectional view of the second housing of the present invention;

[0022] Figure 4 is a schematic structural diagram of the centrifuge frame of the present invention;

[0023] Figure 5 is a schematic structural diagram of the variable-diameter conical spring of the present invention;

[0024] Figure 6 is a sectional view of the present invention with the blade parallel to the end face;

[0025] Figure 7 Partial sectional view of the concave air box of the present invention;

[0026] Figure 8 Partial sectional view of the hydraulic cylinder of the present invention;

[0027] Figure 9 Partial sectional view of the air duct box of the present invention;

[0028] Figure 10 Half-sectional view of the ventilation ring of the present invention;

[0029] Figure 11 Partial sectional view of the ventilation ring of the present invention.

[0030] Explanation of reference numerals: 1 - First housing, 2 - Second housing, 3 - T-shaped cylinder, 4 - High-speed nozzle, 5 - Centering column, 6 - Blade, 601 - First metal plate, 602 - Second metal plate, 7 - Centrifugal frame, 701 - Rectangular chute, 8 - Slide block, 9 - Variable-diameter conical spring, 10 - Connecting rod, 11 - Rotating ring, 12 - Positioning ring, 13 - First intake cylinder, 131 - First intake groove, 14 - Second intake cylinder, 141 - Second intake groove, 15 - Air duct box, 16 - Heat insulation sleeve, 17 - Concave air box, 18 - Damping column, 19 - Installation piston, 20 - Air-blocking head, 21 - Hydraulic piston, 22 - Hydraulic cylinder, 23 - Rotary column piston head, 24 - Hand valve, 25 - Exhaust pipe, 26 - Ventilation ring, 27 - Windshield, 28 - Deflector. Detailed implementation manners

[0031] The present invention will be further described below in conjunction with the accompanying drawings and detailed implementation manners. Embodiment 1

[0032] A hot air generating device for a low-temperature tempering furnace, as Figures 1-11 shown, includes a first housing 1, a second housing 2 is fixedly connected to one side of the first housing 1 in a communicating manner, an air outlet is provided on one side of the second housing 2, an installation hole is provided on the other side of the first housing 1, and a T-shaped cylinder 3 is fixedly connected to one end of the installation hole. A high-speed nozzle 4 is fixedly connected to one end of the T-shaped cylinder 3. A heat insulation plate is sleeved outside the high-speed nozzle 4, and a spark head is provided on one side of the high-speed nozzle 4. The spark head is used to ignite the gas. The high-speed nozzle 4 penetrates through the installation hole. It further includes a temperature control unit and an exhaust gas recovery unit. The temperature control unit is installed inside the second housing 2, and the exhaust gas recovery unit is installed at the left end inside the first housing 1. The exhaust gas recovery unit is used for burning exhaust gas;

[0033] The temperature control unit includes a centrifuge rack 7. The centrifuge rack 7 is rotatably connected inside the second housing 2. A rectangular chute 701 is circumferentially distributed on one side of the centrifuge rack 7. A slider 8 is slidably connected in the rectangular chute 701. A variable-diameter conical spring 9 is connected between the slider 8 and the rectangular chute 701. One side of the slider 8 is rotatably connected to a connecting rod 10 through a first support frame. One ends of a plurality of connecting rods 10 are rotatably connected to a rotating ring 11 through a second support frame.

[0034] The temperature control unit further includes blades 6. A plurality of blades 6 are circumferentially distributed and fixedly connected inside the centrifuge rack 7. A plurality of blades 6 are commonly fixedly connected to a centering column 5. The centering column 5 is located at the center of the centrifuge rack 7. One side of the top of the centrifuge rack 7 contacts a damping adjustment unit. The damping adjustment unit is installed on the upper inner side of the second housing 2.

[0035] The temperature control unit further includes a positioning ring 12. One end of the rotating ring 11 is rotatably connected to the positioning ring 12. The positioning ring 12 is fixedly connected to a first air inlet cylinder 13 through a plurality of connecting columns. A first air inlet groove 131 is circumferentially distributed and penetratingly opened on the outer side of the first air inlet cylinder 13. A second air inlet cylinder 14 is slidably connected to the outer side of the first air inlet cylinder 13. A second air inlet groove 141 is opened on the outer side of the second air inlet cylinder 14 corresponding to the first air inlet groove 131. The diameters of the first air inlet groove 131 and the second air inlet groove 141 are the same. A first spring is connected between the first air inlet cylinder 13 and the second air inlet cylinder 14. The first spring is used to control the reset of the first air inlet cylinder 13.

[0036] The temperature control unit further includes an air duct box 15. The air duct box 15 is fixedly connected inside the first housing 1. A blast hole is opened at the bottom of the first housing 1. The blast hole is communicated with the air duct box 15. The second air inlet cylinder 14 is located inside the air duct box 15. One end of the air duct box 15 is fixedly connected to a heat insulation sleeve 16. The heat insulation sleeve 16 is located at the inner wall of the second housing 2. A concave air box 17 is fixedly connected to the inner top of the heat insulation sleeve 16. An installation piston 19 is hermetically slidably connected inside the concave air box 17. A damping column 18 is clamped inside the installation piston 19. The damping column 18 contacts the centrifuge rack 7.

[0037] The temperature control unit further includes a first metal plate 601 and a second metal plate 602. The blade 6 is welded and synthesized by the first metal plate 601 and the second metal plate 602. The coefficient of thermal expansion of the second metal plate 602 is greater than that of the first metal plate 601. The side with the reduced thickness of the first metal plate 601 remains suspended to prevent damage to the centering column 5 and the centrifuge rack 7 when the first metal plate 601 and the second metal plate 602 undergo stress bending.

[0038] The damping adjustment unit further includes a gas blocking head 20 and a hydraulic piston 21. One side of the concave gas tank 17 is slidably connected throughly with the gas blocking head 20. The end face of the gas blocking head 20 is in contact sealing with the concave gas tank 17. A hydraulic piston 21 is fixedly connected to the side of the concave gas tank 17 opposite to the gas blocking head 20. A second spring is connected between the hydraulic piston 21 and the gas blocking head 20. An air inlet hole is provided on one side of the concave gas tank 17. The air inlet hole penetrates through the heat insulation sleeve 16 through a first hose and is communicated with the air duct box 15.

[0039] The damping adjustment unit further includes a hydraulic cylinder 22. The hydraulic cylinder 22 is fixedly connected throughly to the top of the second housing 2. The outside of the hydraulic cylinder 22 is fixedly connected to the heat insulation sleeve 16. A second hose is communicated between one end of the hydraulic cylinder 22 and the hydraulic piston 21. A screw piston head 23 is threadedly connected inside the hydraulic cylinder 22. A hand valve 24 is fixedly connected to one end of the screw piston head 23. The inside of the hydraulic cylinder 22 is filled with hydraulic oil below the screw piston head 23.

[0040] The waste gas recovery unit includes a waste gas pipe 25. The waste gas pipes 25 are fixedly connected throughly to both the top and the bottom of the inner part of the first housing 1. A ventilation ring 26 is fixedly connected in a communicating manner between the waste gas pipes 25. The ventilation ring 26 is sleeved outside the high-speed nozzle 4. Spiral air ducts are circumferentially distributed and provided on the inner side of the ventilation ring 26. The spiral air ducts correspond to one end of the high-speed nozzle 4. One end of the ventilation ring 26 is fixedly connected to the second air inlet cylinder 14.

[0041] The waste gas recovery unit further includes a wind baffle 27 and a flow guiding plate 28. Wind baffles 27 are fixedly connected to the ventilation ring 26 near the waste gas pipes 25. A flow guiding plate 28 is provided between the spiral air ducts inside the ventilation ring 26. The left and right sides of the flow guiding plate 28 do not contact the ventilation ring 26. The flow guiding plates 28 at the uppermost and lowermost positions are respectively fixedly connected to the wind baffles 27.

[0042] A chamfer is provided near one end of the second air inlet cylinder 14 on the inner side. The chamfer taper is small and is used to compress the air flow when the air flow contacts the chamfer, so as to improve the flow velocity of the air flow.

[0043] In the initial state, the first air inlet groove 131 communicates with the second air inlet groove 141 without misalignment, and high-pressure cold air is continuously blown into the air blowing holes. The second housing 2 is connected to the exhaust gas pipe 25 at the bottom of the first housing 1 through a tempering furnace, and the exhaust gas pipe 25 at the top is connected to an exhaust gas recovery device. The staff injects fuel gas and a combustion-supporting agent into the T-shaped cylinder 3, so that the fuel gas and the combustion-supporting agent are fully mixed in the T-shaped cylinder 3. The mixed gas is ejected through the high-speed nozzle 4 and ignited by the spark plug of the high-speed nozzle 4. The mixed gas burns to generate a larger volume of high-temperature gas. The high-temperature gas expands rapidly after passing through the ventilation ring 26 and is sprayed on the chamfer of the second air inlet cylinder 14 in a conical trajectory. The continuous rightward movement of the high-temperature gas causes the cross-sectional area of its flow to become smaller, and the flow velocity of the high-temperature gas increases. The high-temperature gas passes through the inner walls of the first air inlet cylinder 13 and the second air inlet cylinder 14 and blows towards the blade 6, causing the blade 6 to drive the centering column 5 and the centrifugal frame 7 to rotate. The rotation of the centrifugal frame 7 causes the slider 8 to slide in the rectangular chute 701 under the action of centrifugal force and squeeze the variable-diameter cone spring 9. It should be noted that the larger outer diameter of the variable-diameter cone spring 9 has a larger material diameter, so that the variable-diameter cone spring 9 adapts to the centrifugal force of the slider 8. The elastic force generated when it is squeezed is proportional to the cube of the radius of the trajectory where the slider 8 is located, avoiding excessive centrifugal force on the slider 8 during rotation, resulting in its inability to reset; the sliding of the slider 8 in the rectangular chute 701 drives the connecting rod 10 to move synchronously. Since one end of the connecting rod 10 is restricted by the rotating ring 11, when the connecting rod 10 moves, it pulls the rotating ring 11 to slide towards the centrifugal frame 7, and when the slider 8 rotates, it drives the rotating ring 11 to rotate synchronously through the connecting rod 10. The sliding of the rotating ring 11 drives the positioning ring 12 to slide synchronously, so that the positioning ring 12 drives the first air inlet cylinder 13 to slide through a plurality of connecting columns. At this time, the communication diameter between the first air inlet groove 131 and the second air inlet groove 141 changes, and the first spring is stretched. The high-pressure cold air at the air blowing holes flows into the air duct box 15 and is mixed with the high-temperature gas in turn through the second air inlet groove 141 and the first air inlet groove 131 to cool the high-temperature gas. Since the high-temperature gas is accelerated by the high-speed nozzle 4, gas combustion and the second air inlet cylinder 14 at the same time, the kinetic energy of the high-temperature gas increases. According to Bernoulli's principle, the sum of the potential energy, kinetic energy and static pressure energy of the air flow is a constant value. Therefore, when the high-temperature gas flows at high speed in the first air inlet cylinder 13, the height of the high-temperature gas does not change, its potential energy remains unchanged, and the static pressure energy at the first air inlet groove 131 decreases, manifested as a decrease in the pressure at the first air inlet groove 131. The high-pressure cold air in the first air inlet groove 131 is accelerated and taken away by the high-temperature gas, improving the refrigeration efficiency of the high-pressure cold air. Moreover, the first air inlet groove 131 is inclined in the direction of the high-temperature gas flow, so that the mixing of the high-pressure cold air and the high-temperature gas does not affect the flow velocity of the high-temperature gas, thereby ensuring the timely flow of the high-temperature gas at the high-speed nozzle 4 and avoiding the accumulation of high-temperature gas at the high-speed nozzle 4 to generate a high-pressure environment, resulting in a slow flow velocity of the mixed gas in the high-speed nozzle 4 and then reducing the combustion efficiency; the high-temperature gas is cooled by the high-pressure cold air to form low-temperature gas, and then flows out through the air outlet hole of the second housing 2 and enters the tempering furnace.

[0044] When the low-temperature gas blows on the surface of the blade 6, the low-temperature gas still has a certain temperature, causing the first metal plate 601 and the second metal plate 602 to thermally expand simultaneously. Since the thermal expansion coefficient of the second metal plate 602 is greater than that of the first metal plate 601, uneven internal stress will be generated when the blade 6 is heated. The second metal plate 602 expands and bends towards the first metal plate 601, causing the blade 6 to twist. The internal stress distribution on the thicker side of the first metal plate 601 is relatively uniform, with better bending resistance, so that the centering column 5 and the centrifugal frame 7 will not be damaged due to stress deformation when the blade 6 twists. During the twisting process of the blade 6, the effective windward area of the blade 6 becomes smaller, which further causes the rotational speed of the centrifugal frame 7 to decrease. The decrease in the rotational speed of the centrifugal frame 7 further causes the centrifugal force of the slider 8 to become smaller. The variable-diameter conical spring 9 resets and squeezes the slider 8, so that when the connecting rod 10 rotates, it pushes the rotating ring 11 away from the centrifugal frame 7. At this time, the movement of the rotating ring 11 drives the first air inlet cylinder 13 to move synchronously through the positioning ring 12, making the communication cross-section between the first air inlet groove 131 and the second air inlet groove 141 larger. Moreover, the elastic force generated by the stretching of the first spring will also drive the first air inlet cylinder 13 away from the centrifugal frame 7. At this time, more high-pressure cold flow enters the first air inlet groove 131 through the second air inlet groove 141 and mixes with the high-temperature gas inside the first air inlet cylinder 13, reducing the temperature of the mixed low-temperature gas, realizing the adaptive adjustment when the low-temperature gas is overheated, and preventing the temperature of the low-temperature gas after cooling from being too high and affecting the crystal phase during the metal tempering and cooling in the tempering furnace; when the temperature of the low-temperature gas after cooling is too low and blows on the surface of the blade 6, causing the blade 6 to shrink and deform, the blade 6 gradually flattens, and the effective windward area becomes larger, causing the blade 6 to be driven by a greater wind force to accelerate the rotation of the centrifugal frame 7. The acceleration of the rotation of the centrifugal frame 7 makes the centrifugal force of the slider 8 become larger and squeeze the variable-diameter conical spring 9. At the same time, the rotation of the slider 8 drives the rotating ring 11 to rotate synchronously through the connecting rod 10, and the sliding of the slider 8 drives the rotating ring 11 to approach the centrifugal frame 7 through the connecting rod 10. The movement of the rotating ring 11 drives the first air inlet cylinder 13 to move synchronously through the positioning ring 12, making the communication cross-section between the first air inlet groove 131 and the second air inlet groove 141 smaller, reducing the high-pressure cold flow flowing into the first air inlet cylinder 13, thereby increasing the temperature of the mixed low-temperature gas, realizing the adaptive adjustment when the low-temperature gas after cooling is supercooled, and preventing the gas temperature from being too low and affecting the crystal phase during the metal tempering and cooling in the tempering furnace.

[0045] When the centrifuge rack 7 rotates, it is always decelerated by being squeezed by the damping column 18 to prevent the centrifuge rack 7 from having poor stability due to too high a rotation speed. When the damping column 18 wears out, the high-pressure gas in the concave air box 17 will push the damping column 18 to continue squeezing the centrifuge rack 7. At this time, the air pressure in the concave air box 17 decreases, and the gas in the airway box 15 enters the concave air box 17 through the first hose, making the air pressure in the concave air box 17 stable and ensuring that the damping column 18 generates a stable frictional force on the centrifuge rack 7; when it is necessary to adjust the temperature of the high-temperature gas, the staff rotates the hand valve 24, causing the hand valve 24 to drive the rotating piston head 23 to slide in the hydraulic cylinder 22. At this time, the volume in the hydraulic cylinder 22 changes, and the hydraulic oil in the hydraulic cylinder 22 exchanges with the hydraulic oil in the hydraulic piston 21 through the second hose. If the hydraulic oil in the hydraulic piston 21 increases, the hydraulic piston 21 becomes longer, and then the hydraulic piston 21 squeezes the second spring, causing the second spring to generate a greater elastic force. As a result, the high-pressure gas needs a greater pressure to squeeze the air-blocking head 20 and flow out of the concave air box 17. At the same time, the increased pressure of the high-pressure gas squeezes the installation piston 19 to push the damping column 18, causing the damping column 18 to generate a greater pressure on the centrifuge rack 7, thereby increasing the friction between the damping column 18 and the centrifuge rack 7 and reducing the rotation speed of the centrifuge rack 7; if the hydraulic oil in the hydraulic piston 21 decreases, the hydraulic piston 21 becomes shorter, and then the second spring resets, causing the elastic force of the second spring to become smaller. The high-pressure gas can squeeze the air-blocking head 20 and flow out of the concave air box 17 with a smaller pressure. At the same time, the decreased pressure of the high-pressure gas squeezes the installation piston 19 to push the damping column 18, causing the pressure of the damping column 18 on the centrifuge rack 7 to become smaller, thereby reducing the friction between the damping column 18 and the centrifuge rack 7 and increasing the rotation speed of the centrifuge rack 7. The discharged gas mixes with the low-temperature gas through diffusion. Since the flow rate of the discharged gas is much smaller than the flow rate of the low-temperature gas, the temperature of the low-temperature gas does not change significantly; when the damping column 18 is severely worn, the staff removes the second housing 2 and the centrifuge rack 7, then pulls out the damping column 18 from one end of the installation piston 19 and inserts a new damping column 18 to replace the damping column 18.

[0046] The generated low-temperature gas flows out from the air outlet of the second housing 2, becomes waste gas containing organic compounds after passing through the tempering furnace, and the waste gas enters the ventilation ring 26 through the waste gas pipe 25 at the bottom. Under the blocking of the wind deflector 27 and the guiding of the flow guiding plate 28, the waste gas flows from the left end to the right end inside the ventilation ring 26 and flows into the waste gas recovery device through the waste gas pipe 25 at the top. Part of the waste gas flows to the outer flame of the flame of the high-speed nozzle 4 through the spiral air duct of the ventilation ring 26. At this time, the unburned gas is mixed with the carbon black particles and organic compounds in the waste gas, so that the organic compounds reach the mixed combustion concentration, and the unburned gas, carbon black particles and organic compounds are ignited at the same time, generating a large amount of gas. Moreover, due to the high heat of the waste gas itself, the high-temperature gas generated by combustion has a higher temperature, reducing the use of gas and effectively improving the heat utilization of resources. It should be noted that if all the waste gas flows to the outer flame of the flame of the high-speed nozzle 4 through the spiral air duct of the ventilation ring 26 for combustion, the waste gas can only be recovered at the temperature control unit after being ignited. At this time, the waste gas has absorbed a large amount of heat, and the main source of this heat is the heat released by gas combustion. Recycling the waste gas will cause the heat released by gas combustion to be wasted, resulting in unnecessary consumption of gas and reducing the utilization rate of gas.

[0047] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A hot air generating device for a low-temperature tempering furnace, comprising a first housing (1), a second housing (2) is fixedly connected to one side of the first housing (1) in a communicating manner, an air outlet hole is formed in one side of the second housing (2), an installation hole is formed in the other side of the first housing (1), and a T-shaped cylinder (3) is fixedly connected to one end of the installation hole. One end of the T-shaped cylinder (3) is fixedly connected to a high-speed nozzle (4). A heat insulation plate is sleeved outside the high-speed nozzle (4), and a spark head is arranged on one side of the high-speed nozzle (4). The high-speed nozzle (4) penetrates through the installation hole, and is characterized in that, It also includes a temperature control unit and an exhaust gas recovery unit. The temperature control unit is installed inside the second housing (2), and the exhaust gas recovery unit is installed at the left end inside the first housing (1). The exhaust gas recovery unit is used for burning exhaust gas; The temperature control unit includes a centrifugal frame (7). The centrifugal frame (7) is rotatably connected inside the second housing (2). A rectangular sliding groove (701) is circumferentially distributed on one side of the centrifugal frame (7). A slider (8) is slidably connected in the rectangular sliding groove (701). A variable-diameter conical spring (9) is connected between the slider (8) and the rectangular sliding groove (701). One side of the slider (8) is rotatably connected to a connecting rod (10). One ends of a plurality of connecting rods (10) are rotatably connected to a rotating ring (11); The temperature control unit also includes blades (6). A plurality of blades (6) are fixedly connected circumferentially inside the centrifugal frame (7). A plurality of blades (6) are commonly fixedly connected to a centering column (5). One side of the top of the centrifugal frame (7) contacts a damping adjustment unit. The damping adjustment unit is installed on the upper part inside the second housing (2); The temperature control unit also includes a positioning ring (12). One end of the rotating ring (11) is rotatably connected to the positioning ring (12). The positioning ring (12) is fixedly connected to a first air inlet cylinder (13) through a plurality of connecting columns. First air inlet grooves (131) are circumferentially distributed and penetrated on the outer side of the first air inlet cylinder (13). A second air inlet cylinder (14) is slidably connected to the outer side of the first air inlet cylinder (13). Second air inlet grooves (141) are provided on the outer side of the second air inlet cylinder (14) corresponding to the first air inlet grooves (131). A first spring is connected between the first air inlet cylinder (13) and the second air inlet cylinder (14).

2. The hot air generating device of a low-temperature tempering furnace according to claim 1, wherein, The temperature control unit also includes an air duct box (15). The air duct box (15) is fixedly connected inside the first housing (1). A blower hole is provided at the bottom of the first housing (1). The blower hole is communicated with the air duct box (15). The second air inlet cylinder (14) is located inside the air duct box (15). One end of the air duct box (15) is fixedly connected to a heat insulation sleeve (16). The heat insulation sleeve (16) is located at the inner wall of the second housing (2). A concave air box (17) is fixedly connected to the inner side of the heat insulation sleeve (16). An installation piston (19) is hermetically slidably connected inside the concave air box (17). One end of the installation piston (19) is clamped with a damping column (18). The damping column (18) contacts the centrifugal frame (7).

3. The hot air generating device of a low-temperature tempering furnace according to claim 2, characterized in that, The temperature control unit also includes a first metal plate (601) and a second metal plate (602). The blade (6) is welded and synthesized by the first metal plate (601) and the second metal plate (602).

4. The hot air generating device of a low-temperature tempering furnace according to claim 3, characterized in that, The damping adjustment unit includes a gas plug (20) and a hydraulic piston (21). The gas plug (20) is slidably penetrated on one side of the concave air box (17). The hydraulic piston (21) is fixedly connected to the side of the concave air box (17) opposite to the gas plug (20). A second spring is connected between the hydraulic piston (21) and the gas plug (20). An air inlet hole is provided on one side of the concave air box (17). The air inlet hole penetrates through the heat insulation sleeve (16) through a first hose and is communicated with the air duct box (15).

5. A hot air generating device for a low-temperature tempering furnace according to claim 4, characterized in that, The damping adjustment unit further includes a hydraulic cylinder (22). The hydraulic cylinder (22) is fixedly connected to the top of the second housing (2) in a penetrating manner. The outer side of the hydraulic cylinder (22) is fixedly connected to a heat insulation sleeve (16). A second hose is communicated between one end of the hydraulic cylinder (22) and a hydraulic piston (21). A screw piston head (23) is connected to the hydraulic cylinder (22) by internal threads. A hand valve (24) is fixedly connected to one end of the screw piston head (23).

6. The hot air generating device of a low-temperature tempering furnace according to claim 5, characterized in that The exhaust gas recovery unit includes an exhaust gas pipe (25). The exhaust gas pipe (25) is fixedly connected to the top and bottom of the inner part of the first housing (1) in a penetrating manner. A ventilation ring (26) is fixedly connected between the exhaust gas pipes (25) in a communicating manner. The ventilation ring (26) is sleeved on the outer side of the high-speed nozzle (4). A spiral air passage is circumferentially distributed and opened on the inner side of the ventilation ring (26). One end of the ventilation ring (26) is fixedly connected to the second air intake cylinder (14).

7. The hot air generating device of a low-temperature tempering furnace according to claim 6, characterized in that, The exhaust gas recovery unit further includes a wind shield (27) and a deflector (28). The wind shield (27) is fixedly connected to the ventilation ring (26) near the exhaust gas pipe (25). A deflector (28) is arranged between the spiral air passages inside the ventilation ring (26). The deflectors (28) located at the uppermost and lowermost positions are respectively fixedly connected to the wind shield (27).

8. The hot air generating device of a low-temperature tempering furnace according to claim 7, characterized in that A chamfer is opened at one end of the second air intake cylinder (14) near the ventilation ring (26), and the chamfer taper is small.

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