Hot air generating device of low-temperature tempering furnace

Abstract

The invention relates to the field of industrial heating, in particular to a hot air generating device of a low-temperature tempering furnace. The technical problem to be solved is to overcome the defects of heat waste of waste gas and unstable hot air temperature. According to the technical scheme, the device comprises a first shell, one side of the first shell is fixedly connected with a second shell in a communicating mode, one side of the second shell is provided with an air outlet hole, the other side of the first shell is provided with a mounting hole, one end of the mounting hole is fixedly connected with a T-shaped cylinder, one end of the T-shaped cylinder is fixedly connected with a high-speed nozzle, and the outer side of the high-speed nozzle is sleeved with a heat insulation plate; and a spark head is arranged on one side of the high-speed nozzle. The burner has the beneficial effects that the direction of waste gas is guided through the wind shield and the flow guide plate, combustible substances in the waste gas are ignited at the high-speed nozzle through the spiral gas channel of the ventilation ring, the basic temperature of fuel gas and a combustion improver is increased through heat of the waste gas, fuel gas needed for generating high-temperature gas is reduced, and the utilization rate of the fuel gas is increased.

Description

Technical Field

[0001] The 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-processing method for metals. It improves the toughness of metals by slowly cooling metal parts at a specific temperature to form different crystal lattices. The best method is hot air heating. For large tempering furnaces, the existing technology is fuel combustion heating, which generates heat through the combustion chamber and then applies the heat 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 a waste of resources. In addition, the existing hot air generating devices cannot ensure the stability of the hot air temperature, which affects the quality of parts during tempering. Summary of the invention

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

[0004] The technical scheme is as follows: A hot air generating device for a low-temperature tempering furnace comprises a first shell, one side of the first shell is connected and fixedly connected to a second shell, one side of the second shell is provided with an air outlet, the other side of the first shell is provided with a mounting hole, one end of the mounting hole is fixedly connected to a T-shaped cylinder, one end of the T-shaped cylinder is fixedly connected to a high-speed nozzle, a heat insulation plate is sleeved on the outer side of the high-speed nozzle, a spark head is provided on one side of the high-speed nozzle, the high-speed nozzle passes through the mounting hole, and further comprises a temperature control unit and an exhaust gas recovery unit, the temperature control unit is installed inside the second shell, the exhaust gas recovery unit is installed at the left end inside the first shell, and the exhaust gas recovery unit is used to burn exhaust gas; The temperature control unit includes a centrifugal frame, which is rotatably connected inside the second shell, a rectangular slide groove is circumferentially distributed on one side of the centrifugal frame, a slider is slidably connected in the rectangular slide groove, a reducing cone spring is connected between the slider and the rectangular slide groove, a connecting rod is rotatably connected to one side of the slider, and one end of a plurality of connecting rods is rotatably connected to a rotating ring.

[0005] Preferably, the temperature control unit also includes blades, a plurality of blades are fixedly connected to the centrifugal frame in a circumferential distribution, a plurality of blades are commonly fixedly connected to a centering column, a damping adjustment unit is contacted on one side of the top end of the centrifugal frame, and the damping adjustment unit is installed on the upper inner side of the second shell.

[0006] Preferably, the temperature control unit also includes a positioning ring, one end of the rotating ring is rotatably connected to the positioning ring, the positioning ring is fixedly connected to the first air inlet cylinder through a plurality of connecting columns, a first air inlet groove is circumferentially distributed and penetrated on the outer side of the first air inlet cylinder, a second air inlet cylinder is slidably connected to the outer side of the first air inlet cylinder, a second air inlet groove is provided on the outer side of the second air inlet cylinder corresponding to the first air inlet groove, and a first spring is connected between the first air inlet cylinder and the second air inlet cylinder.

[0007] Preferably, the temperature control unit also includes an airway box, the airway box is fixedly connected to the first shell, a blast hole is opened at the bottom of the first shell, the blast hole is connected to the airway box, the second air inlet cylinder is located inside the airway box, a heat-resistant sleeve is fixedly connected to one end of the airway box, the heat-resistant sleeve is located on the inner wall of the second shell, a concave air box is fixedly connected to the inner side of the heat-resistant sleeve, a mounting piston is sealed and slidably connected inside the concave air box, a damping column is clamped at one end of the mounting piston, and the damping column is in contact with the centrifugal frame.

[0008] Preferably, the temperature control unit further includes a first metal plate and a second metal plate, and the blades are welded together by the first metal plate and the second metal plate.

[0009] Preferably, the damping adjustment unit includes an air blocking head and a hydraulic piston. The air blocking head is slidably connected to one side of the concave air box, and the hydraulic piston is fixedly connected to the side of the concave air box opposite to the air blocking head. A second spring is connected between the hydraulic piston and the air blocking head. An air inlet hole is opened on one side of the concave air box, and the air inlet hole passes through the heat-resistant sleeve through a first hose and is connected to the airway box.

[0010] Preferably, the damping adjustment unit also includes a hydraulic cylinder, which is fixedly connected to the top of the second shell body in a through-type manner, and the outer side of the hydraulic cylinder is fixedly connected to the heat-resistant sleeve. A second hose is connected between one end of the hydraulic cylinder and the hydraulic piston, and a rotary piston head is connected to the inner thread of the hydraulic cylinder, and a hand valve is fixedly connected to one end of the rotary piston head.

[0011] Preferably, the exhaust gas recovery unit includes an exhaust pipe, and the exhaust pipe is fixedly connected to the top and the bottom of the first shell, and a ventilation ring is fixedly connected between the exhaust pipes. The ventilation ring is arranged on the outside of the high-speed nozzle, and spiral air channels are circumferentially distributed on the inner side of the ventilation ring. One end of the ventilation ring is fixedly connected to the second air inlet cylinder.

[0012] Preferably, the exhaust gas recovery unit also includes a wind shield and a guide plate. The ventilation ring is fixedly connected to a wind shield near the exhaust pipe. Guide plates are provided between the spiral air ducts in the ventilation ring. The guide plates at the top and bottom are respectively fixedly connected to the wind shield.

[0013] 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 has a small taper.

[0014] The beneficial effects of the present invention are as follows: 1. The present invention controls the movement of the slider through the centrifugal frame, controls the air intake size of the first air intake cylinder through the connecting rod, and controls the rotation speed of the centrifugal frame through the damping column, so that the staff can control the temperature of the low-temperature gas by changing the pressure of the damping column, and when the damping column is worn, it can be pushed in time by the gas in the airway box to ensure the stability of the temperature control of the damping column.

[0015] 2. The present invention guides the direction of the exhaust gas through the wind shield and the guide plate, ignites the combustible material in the exhaust gas at the high-speed nozzle through the spiral air duct of the ventilation ring, and uses the chemical energy released by the ignition of the exhaust gas to further improve the utilization effect of the exhaust gas, and uses the heat of the exhaust gas itself to increase the basic temperature of the fuel gas and the combustion aid, thereby reducing the heat waste of the exhaust gas and the pollution caused by the exhaust gas to the environment, and reducing the fuel gas required to generate high-temperature gas, thereby improving the utilization rate of the fuel gas.

[0016] 3. The present invention utilizes the chamfer of the second air intake cylinder to pressurize and accelerate the high-temperature gas after combustion, so that the high-temperature gas can attract more high-pressure cold flow to mix with the high-temperature gas during flow, thereby improving the efficiency of cooling the high-temperature gas. The inclination direction of the first air intake groove is the same as the flow direction of the high-temperature gas, which reduces the obstruction of the high-pressure cold flow to the flow of the high-temperature gas when it enters, so that the high-speed nozzle will not hinder the ejection of the gas, thereby improving the combustion efficiency of the gas.

[0017] 4. The present invention controls the shape of the blades through the different thermal expansion coefficients of the first metal plate and the second metal plate, thereby controlling the rotation speed of the centrifugal frame. The rotation speed of the centrifugal frame directly affects the movement trajectory of the slider, causing the positions of the rotating ring, the positioning ring and the first air inlet cylinder to change, thereby affecting the flow rate of the high-pressure cold flow, achieving the effect of adaptively adjusting the temperature of the low-temperature gas, preventing the low-temperature gas from being overcooled or overheated, and improving the temperature stability of the low-temperature gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 is a half-section schematic diagram of the first shell of the present invention; Figure 3 is a half-section schematic diagram of the second shell of the present invention; Figure 4 It is a structural schematic diagram of the centrifugal frame of the present invention; Figure 5 It is a schematic structural diagram of the variable diameter cone spring of the present invention; Figure 6 It is a schematic cross-sectional view of the blade of the present invention parallel to the end surface; Figure 7 It is a partial cutaway schematic diagram of the concave air box of the present invention; Figure 8 It is a partial cutaway schematic diagram of the hydraulic cylinder of the present invention; Fig. 9 It is a partial cutaway schematic diagram of the airway box of the present invention; Fig.10 A half-section schematic diagram of a ventilation ring of the present invention; Fig.11 It is a partial cutaway schematic diagram of the ventilation ring of the present invention.

[0019] Explanation of the accompanying drawings: 1_first shell, 2_second shell, 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 slide groove, 8_slider, 9_reducing cone spring, 10_connecting rod, 11_rotating ring, 12_positioning ring, 13_first air inlet cylinder, 131_first air inlet groove, 14_second air inlet cylinder, 141_second air inlet groove, 15_airway box, 16_heat-resistant sleeve, 17_concave air box, 18_damping column, 19_installing piston, 20_gas blocking head, 21_hydraulic piston, 22_hydraulic cylinder, 23_swivel piston head, 24_hand valve, 25_exhaust pipe, 26_ventilation ring, 27_wind shield, 28_guide plate. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Example 1

[0021] A hot air generating device for a low temperature tempering furnace, such as Figure 1-Figure 11 As shown, it includes a first shell 1, one side of the first shell 1 is connected and fixedly connected with a second shell 2, one side of the second shell 2 is provided with an air outlet, the other side of the first shell 1 is provided with a mounting hole, and one end of the mounting hole is fixedly connected with a T-shaped cylinder 3, one end of the T-shaped cylinder 3 is fixedly connected with a high-speed nozzle 4, a heat insulation plate is sleeved on the outer side of 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 passes through the mounting hole, and also includes a temperature control unit and an exhaust gas recovery unit, the temperature control unit is installed inside the second shell 2, and the exhaust gas recovery unit is installed at the left end inside the first shell 1, and the exhaust gas recovery unit is used to burn the exhaust gas; The temperature control unit includes a centrifugal frame 7, the centrifugal frame 7 is rotatably connected inside the second shell 2, a rectangular slide groove 701 is circumferentially distributed on one side of the centrifugal frame 7, a slider 8 is slidably connected in the rectangular slide groove 701, a reducing cone spring 9 is connected between the slider 8 and the rectangular slide groove 701, one side of the slider 8 is rotatably connected to a connecting rod 10 through a first support frame, and one end of a plurality of connecting rods 10 is rotatably connected to a rotating ring 11 through a second support frame.

[0022] The temperature control unit also includes blades 6, and a plurality of blades 6 are fixedly connected to the centrifugal frame 7 in a circumferential direction. The plurality of blades 6 are fixedly connected to a centering column 5, and the centering column 5 is located at the center of the centrifugal frame 7. A damping adjustment unit is in contact with one side of the top end of the centrifugal frame 7, and the damping adjustment unit is installed on the upper inner side of the second shell 2.

[0023] 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 the first air inlet cylinder 13 through a plurality of connecting columns, the outer side of the first air inlet cylinder 13 is circumferentially distributed with a first air inlet groove 131, the outer side of the first air inlet cylinder 13 is slidably connected to the second air inlet cylinder 14, the outer side of the second air inlet cylinder 14 is provided with a second air inlet groove 141 corresponding to the first air inlet groove 131, the first air inlet groove 131 and the second air inlet groove 141 have the same diameter, a first spring is connected between the first air inlet cylinder 13 and the second air inlet cylinder 14, and the first spring is used to control the reset of the first air inlet cylinder 13.

[0024] The temperature control unit also includes an airway box 15, which is fixedly connected to the first shell 1. A blast hole is opened at the bottom of the first shell 1, and the blast hole is connected to the airway box 15. The second air inlet cylinder 14 is located inside the airway box 15. A heat-resistant sleeve 16 is fixedly connected to one end of the airway box 15. The heat-resistant sleeve 16 is located on the inner wall of the second shell 2. A concave air box 17 is fixedly connected to the top of the inner side of the heat-resistant sleeve 16. A mounting piston 19 is sealed and slidably connected inside the concave air box 17. A damping column 18 is clamped in the mounting piston 19, and the damping column 18 is in contact with the centrifugal frame 7.

[0025] The temperature control unit also includes a first metal plate 601 and a second metal plate 602. The blade 6 is welded together by the first metal plate 601 and the second metal plate 602. The thermal expansion coefficient of the second metal plate 602 is greater than that of the first metal plate 601. The side of the first metal plate 601 with reduced thickness remains suspended to prevent the first metal plate 601 and the second metal plate 602 from damaging the centering column 5 and the centrifugal frame 7 when stress bending occurs.

[0026] The damping adjustment unit also includes an air blocking head 20 and a hydraulic piston 21. The air blocking head 20 is slidably connected to one side of the concave air box 17, wherein the end face of the air blocking head 20 is contact-sealed with the concave air box 17. A hydraulic piston 21 is fixedly connected to the side of the concave air box 17 opposite to the air blocking head 20. A second spring is connected between the hydraulic piston 21 and the air blocking head 20. An air inlet is opened on one side of the concave air box 17, and the air inlet passes through the heat-resistant sleeve 16 through a first hose and is connected to the airway box 15.

[0027] The damping adjustment unit also includes a hydraulic cylinder 22. The hydraulic cylinder 22 is fixedly connected to the top of the second shell 2 in a penetrating manner. The outer side of the hydraulic cylinder 22 is fixedly connected to the heat-resistant sleeve 16. A second hose is connected between one end of the hydraulic cylinder 22 and the hydraulic piston 21. The hydraulic cylinder 22 has a rotary piston head 23 connected to the inner thread. A hand valve 24 is fixedly connected to one end of the rotary piston head 23. The hydraulic cylinder 22 is filled with hydraulic oil below the rotary piston head 23.

[0028] The exhaust gas recovery unit includes an exhaust gas pipe 25. The exhaust gas pipe 25 is fixedly connected to the top and the bottom of the first shell 1. A ventilation ring 26 is fixedly connected between the exhaust gas pipes 25. The ventilation ring 26 is sleeved on the outside of the high-speed nozzle 4. A spiral air channel is circumferentially distributed on the inner side of the ventilation ring 26. The spiral air channel corresponds to one end of the high-speed nozzle 4. One end of the ventilation ring 26 is fixedly connected to the second air intake cylinder 14.

[0029] The exhaust gas recovery unit also includes a wind shield 27 and a guide plate 28. The ventilation ring 26 is fixedly connected to the wind shield 27 near the exhaust pipe 25. The guide plate 28 is provided between the spiral air channels in the ventilation ring 26. The left and right sides of the guide plate 28 are not in contact with the ventilation ring 26. The guide plates 28 located at the top and the bottom are fixedly connected to the wind shield 27 respectively.

[0030] A chamfer is provided at one end of the inner side of the second air inlet cylinder 14 near the ventilation ring 26 , and the chamfer has a small taper, which is used to compress the airflow when the airflow contacts the chamfer and increase the flow speed of the airflow.

[0031] In the initial state, the first air inlet groove 131 is connected with the second air inlet groove 141 without misalignment, and a high-pressure cold flow is continuously blown into the blast hole. The second shell 2 is connected with the exhaust pipe 25 at the bottom of the first shell 1 through the tempering furnace, and the exhaust pipe 25 at the top is connected with the exhaust gas recovery device. The staff introduces fuel gas and combustion aid into the T-type cylinder 3 to fully mix the fuel gas and the combustion aid in the T-type cylinder 3. The mixed gas is ejected through the high-speed nozzle 4 and ignited by the spark head of the high-speed nozzle 4. The mixed gas burns to produce a larger volume of high-temperature gas. The high-temperature gas expands rapidly after passing through the ventilation ring 26 and is ejected at the chamfer of the second air inlet cylinder 14 in a conical trajectory. The high-temperature gas continues to move to the right, resulting in a smaller cross-sectional area of ​​its flow, an increase in the flow rate of the high-temperature gas, and the high-temperature gas The air passes through the inner wall of the first air inlet cylinder 13 and the second air inlet cylinder 14 and blows toward the blade 6, so that the blade 6 drives 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 slide groove 701 under the action of centrifugal force and squeeze the variable cone spring 9. It is worth noting that the variable cone spring 9 has a larger material diameter at a larger outer diameter, so that the variable cone spring 9 can adapt 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 of the slider 8, so as to avoid the slider 8 being unable to reset due to excessive centrifugal force during rotation; the slider 8 slides in the rectangular slide groove 701 and drives the connecting rod 10 to move synchronously. Since one end of the connecting rod 10 is restricted by the rotating ring 11, the connecting rod 10 pulls the rotating ring 11 to slide toward the centrifugal frame 7 when it moves, and the sliding When the block 8 rotates, the rotating ring 11 is driven to rotate synchronously through the connecting rod 10, and 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 number of connecting columns. At this time, the connecting diameter of the first air inlet groove 131 and the second air inlet groove 141 changes, and the first spring is stretched. The high-pressure cold flow at the blast hole flows into the airway box 15, and is mixed with the high-temperature gas through the second air inlet groove 141 and the first air inlet groove 131 in turn, so as 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 is increased. According to the Bernoulli principle, the sum of the potential energy, kinetic energy and static pressure energy of the airflow is a constant. Therefore, the high-temperature gas is high in the first air inlet cylinder 13. When the high-speed flow occurs, the high-temperature gas does not change in height, and its potential energy remains unchanged. The static pressure at the first air inlet groove 131 can be reduced, which is manifested as a decrease in the pressure at the first air inlet groove 131. The high-pressure cold flow in the first air inlet groove 131 is accelerated and drawn away by the high-temperature gas, thereby improving the refrigeration efficiency of the high-pressure cold flow. In addition, the first air inlet groove 131 is inclined in the flow direction of the high-temperature gas, so that when the high-pressure cold flow mixes with the high-temperature gas, the flow rate of the high-temperature gas will not be affected, thereby ensuring that the high-temperature gas at the high-speed nozzle 4 flows in time, avoiding the accumulation of high-temperature gas at the high-speed nozzle 4 to produce a high-pressure environment, causing the flow rate of the mixed gas in the high-speed nozzle 4 to slow down, thereby reducing the combustion efficiency; the high-temperature gas is cooled by the high-pressure cold flow to form a low-temperature gas, and then flows out through the air outlet of the second shell 2 and enters the tempering furnace.

[0032] 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 expand simultaneously. Since the thermal expansion coefficient of the second metal plate 602 is greater than that of the first metal plate 601, the blade 6 will generate unevenly distributed internal stress when heated, and the second metal plate 602 expands and bends toward 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 more uniform, and has better bending resistance, so that when the blade 6 is twisted, the stress deformation will not damage the centering column 5 and the centrifugal force. During the twisting of the centrifugal frame 7 and the blades 6, the effective wind receiving area of ​​the blades 6 becomes smaller, which leads to a lower speed of the centrifugal frame 7. The lower speed of the centrifugal frame 7 further leads to a smaller centrifugal force of the slider 8. The reducing cone spring 9 resets and squeezes the slider 8, so that the connecting rod 10 pushes the rotating ring 11 away from the centrifugal frame 7 when it rotates. At this time, the rotating ring 11 moves through the positioning ring 12 to drive the first air inlet cylinder 13 to move synchronously, so that the connecting section of the first air inlet groove 131 and the second air inlet groove 141 becomes larger, and 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 The 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, thereby reducing the temperature of the mixed low-temperature gas, realizing adaptive regulation when the low-temperature gas is overheated, and preventing the low-temperature gas from being too high after cooling and affecting the crystal phase of the metal during tempering cooling in the tempering furnace; when the temperature of the low-temperature gas after cooling is 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 wind receiving area becomes larger, so that the blade 6 is subjected to greater wind force to drive the centrifugal frame 7 to rotate faster, and the accelerated rotation of the centrifugal frame 7 increases the centrifugal force of the slider 8 The reducing cone spring 9 is extruded, and at the same time, the slider 8 rotates through the connecting rod 10 to drive the rotating ring 11 to rotate synchronously, and the slider 8 slides through the connecting rod 10 to drive the rotating ring 11 to approach the centrifugal frame 7, and the rotating ring 11 moves through the positioning ring 12 to drive the first air inlet cylinder 13 to move synchronously, so that the connecting cross-section of the first air inlet groove 131 and the second air inlet groove 141 becomes smaller, and the high-pressure cold flow flowing into the first air inlet cylinder 13 is reduced, thereby increasing the temperature of the mixed low-temperature gas, realizing adaptive adjustment when the low-temperature gas after cooling is overcooled, and preventing the gas temperature from being too low to affect the crystal phase of the metal during tempering cooling in the tempering furnace.

[0033] The centrifugal frame 7 is always squeezed and decelerated by the damping column 18 when rotating, so as to prevent the centrifugal frame 7 from having poor stability due to excessively high rotation speed. When the damping column 18 is worn, the high-pressure gas in the concave air box 17 will push the damping column 18 to continue squeezing the centrifugal frame 7. At this time, the air pressure in the concave air box 17 is reduced, and the gas in the airway box 15 enters the concave air box 17 through the first hose, so that the air pressure in the concave air box 17 is stable, thereby ensuring that the damping column 18 generates a stable friction force on the centrifugal frame 7. When the temperature of the high-temperature gas needs to be adjusted, the staff The hand valve 24 is rotated to make the hand valve 24 drive the piston head 23 of the rotary column 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 is exchanged 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, thereby causing the hydraulic piston 21 to squeeze the second spring, so that the second spring produces a greater elastic force, thereby requiring a greater pressure for the high-pressure gas to squeeze the gas plugging head 20 and flow out of the concave air box 17. At the same time, the pressure of the high-pressure gas increases, squeezing the installation piston 19 to push the damping column 18, so that the damping column 18 produces a greater pressure on the centrifugal frame 7, thereby increasing the friction of the damping column 18 on the centrifugal frame 7 and reducing the rotation speed of the centrifugal frame 7; if the hydraulic oil in the hydraulic piston 21 decreases, the hydraulic piston 21 becomes shorter, thereby causing the second spring to reset, so that the elastic force of the second spring becomes smaller, and the high-pressure gas needs a smaller pressure to squeeze the gas plugging head 20 and flow out of the concave air box 17. At the same time, the pressure of the high-pressure gas decreases, squeezing the installation piston 19 to push the damping column 18. The pressure of the damping column 18 on the centrifugal frame 7 becomes smaller, thereby reducing the friction of the damping column 18 on the centrifugal frame 7, increasing the rotation speed of the centrifugal frame 7, and the exhausted gas mixes with the low-temperature gas through diffusion. Since the exhausted gas flow rate 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 disassembles the second shell 2 and the centrifugal frame 7, then pulls out the damping column 18 from one end of the mounting piston 19, and inserts a new damping column 18 to replace the damping column 18.

[0034] The generated low-temperature gas flows out from the air outlet of the second shell 2, and becomes waste gas containing organic compounds after passing through the tempering furnace. The waste gas enters the ventilation ring 26 through the waste gas pipe 25 at the bottom. Under the obstruction of the wind shield 27 and the guidance of the guide 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. A part of the waste gas flows to the outer flame of the high-speed nozzle 4 through the spiral air channel of the ventilation ring 26. At this time, the unburned fuel gas is mixed with the carbon black particles and organic compounds in the waste gas, so that the organic compounds reach a mixed combustion concentration, and the unburned fuel gas, carbon black particles and organic compounds are mixed. The compounds are ignited at the same time to produce a large amount of gas, and because the exhaust gas itself has a high heat content, the high-temperature gas generated by the combustion has a higher temperature, which reduces the use of fuel gas and effectively improves the thermal utilization of resources. It is worth noting that if all the exhaust gas flows through the spiral air duct of the ventilation ring 26 to the outer flame of the high-speed nozzle 4 for combustion, the exhaust gas can only be recovered at the temperature control unit after being ignited. At this time, the exhaust gas has absorbed a large amount of heat, and the main source of the heat is the heat released by the combustion of the fuel gas. Recycling the exhaust gas will cause the heat released by the combustion of the fuel gas to be wasted, resulting in unnecessary consumption of fuel gas and reducing the utilization rate of the fuel gas.

[0035] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A hot air generating device for a low-temperature tempering furnace, comprising a first shell (1), one side of the first shell (1) is connected and fixedly connected to a second shell (2), one side of the second shell (2) is provided with an air outlet, the other side of the first shell (1) is provided with a mounting hole, one end of the mounting hole is fixedly connected to a T-shaped cylinder (3), one end of the T-shaped cylinder (3) is fixedly connected to a high-speed nozzle (4), a heat insulation plate is sleeved on the outer side of the high-speed nozzle (4), and a spark head is provided on one side of the high-speed nozzle (4), and the high-speed nozzle (4) passes through the mounting hole, 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 shell (2), and the exhaust gas recovery unit is installed at the left end inside the first shell (1). The exhaust gas recovery unit is used to burn the exhaust gas. The temperature control unit comprises a centrifugal frame (7), the centrifugal frame (7) is rotatably connected inside the second housing (2), a rectangular slide groove (701) is circumferentially distributed on one side of the centrifugal frame (7), a slider (8) is slidably connected inside the rectangular slide groove (701), a reducing cone spring (9) is connected between the slider (8) and the rectangular slide groove (701), a connecting rod (10) is rotatably connected to one side of the slider (8), and a plurality of connecting rods (10) are rotatably connected to one end of a rotating ring (11).

2. A hot air generating device for a low temperature tempering furnace according to claim 1, characterized in that: The temperature control unit also includes blades (6), a plurality of blades (6) are fixedly connected to the centrifugal frame (7) in a circumferentially distributed manner, the plurality of blades (6) are commonly fixedly connected to a centering column (5), a damping adjustment unit is in contact with one side of the top end of the centrifugal frame (7), and the damping adjustment unit is mounted on the upper inner portion of the second shell (2).

3. A hot air generating device for a low temperature tempering furnace according to claim 2, characterized in that: 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 the first air intake cylinder (13) through a plurality of connecting columns, the outer side of the first air intake cylinder (13) is provided with a first air intake groove (131) distributed in a circumferential direction and penetrating therethrough, the outer side of the first air intake cylinder (13) is slidably connected to the second air intake cylinder (14), the outer side of the second air intake cylinder (14) is provided with a second air intake groove (141) corresponding to the first air intake groove (131), and a first spring is connected between the first air intake cylinder (13) and the second air intake cylinder (14).

4. A hot air generating device for a low temperature tempering furnace according to claim 3, characterized in that: The temperature control unit also includes an airway box (15), the airway box (15) is fixedly connected to the first shell (1), a blast hole is opened at the bottom of the first shell (1), the blast hole is communicated with the airway box (15), the second air inlet cylinder (14) is located inside the airway box (15), one end of the airway box (15) is fixedly connected to a heat-resistant sleeve (16), the heat-resistant sleeve (16) is located on the inner wall of the second shell (2), a concave air box (17) is fixedly connected to the inner side of the heat-resistant sleeve (16), a mounting piston (19) is sealingly slidably connected to the concave air box (17), one end of the mounting piston (19) is clamped with a damping column (18), and the damping column (18) is in contact with the centrifugal frame (7).

5. A hot air generating device for a low temperature tempering furnace according to claim 4, characterized in that: The temperature control unit also includes a first metal plate (601) and a second metal plate (602), and the blade (6) is welded together from the first metal plate (601) and the second metal plate (602).

6. A hot air generating device for a low temperature tempering furnace according to claim 5, characterized in that: The damping adjustment unit comprises an air blocking head (20) and a hydraulic piston (21); one side of the concave air box (17) is slidably connected to the air blocking head (20); the side of the concave air box (17) opposite to the air blocking head (20) is fixedly connected to the hydraulic piston (21); a second spring is connected between the hydraulic piston (21) and the air blocking head (20); an air inlet hole is provided on one side of the concave air box (17); the air inlet hole passes through the heat-resistant sleeve (16) through a first hose and is connected to the airway box (15).

7. A hot air generating device for a low temperature tempering furnace according to claim 6, characterized in that: The damping adjustment unit also 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 the heat-resistant sleeve (16), a second hose is connected between one end of the hydraulic cylinder (22) and the hydraulic piston (21), a rotary column piston head (23) is connected to the internal thread of the hydraulic cylinder (22), and a hand valve (24) is fixedly connected to one end of the rotary column piston head (23).

8. A hot air generating device for a low temperature tempering furnace according to claim 7, characterized in that: The exhaust gas recovery unit comprises an exhaust gas pipe (25), the exhaust gas pipe (25) is fixedly connected to the top and bottom of the first shell (1), a ventilation ring (26) is fixedly connected to the exhaust gas pipe (25), the ventilation ring (26) is sleeved on the outside of the high-speed nozzle (4), a spiral air channel is circumferentially distributed on the inside of the ventilation ring (26), and one end of the ventilation ring (26) is fixedly connected to the second air inlet cylinder (14).

9. A hot air generating device for a low temperature tempering furnace according to claim 8, characterized in that: The exhaust gas recovery unit also includes a windshield (27) and a guide plate (28). The ventilation ring (26) is fixedly connected to the windshield (27) near the exhaust gas pipe (25). The guide plates (28) are arranged between the spiral air passages in the ventilation ring (26). The guide plates (28) located at the top and the bottom are respectively fixedly connected to the windshield (27).

10. A hot air generating device for a low temperature tempering furnace according to claim 9, characterized in that: A chamfer is provided at one end of the inner side of the second air inlet cylinder (14) close to the ventilation ring (26), and the chamfer has a small taper.

Images