A bound oil fume air curtain system and a control method thereof

Abstract

The application provides a bound oil fume air curtain system and a control method thereof. The air curtain system comprises a quenching oil pool and a cyclone smoke remover. The cyclone smoke remover is arranged directly above the quenching oil pool. An annular air outlet pipe is arranged on the quenching oil pool. The annular air outlet pipe is connected with a fan through an air outlet pipe. Air flow generated by the fan is sprayed out through air outlets on the annular air outlet pipe to form a circular air curtain. The fan is connected with a control device. The lower part of the cyclone smoke remover is connected with a converging-diverging nozzle. The lower part of the converging-diverging nozzle is provided with an oil fume concentration probe II. The converging-diverging nozzle and the oil fume concentration probe II are connected with a nozzle regulator. The application can control the air curtain and the quenching oil fume to change synchronously. The converging-diverging nozzle can be controlled according to the size of the oil fume to converge and expand, so that the oil fume can be effectively absorbed, filtered and discharged. The application can effectively intercept the oil fume, improve the cleanliness of the workshop environment and reduce the adverse effects of the quenching oil fume on the workers in the workshop.

Description

Technical Field

[0001] This invention relates to the technical field of removing oil fumes in industrial steelmaking, and particularly to an air curtain system for confining oil fumes and its control method. Background Technology

[0002] Heat treatment is an essential process in modern forging, playing a crucial role in improving the quality and strength of workpieces. During the quenching and tempering processes, the use of oil to cool high-temperature workpieces generates a large amount of oil fumes. These fumes not only obstruct the vision of workshop workers but also contain numerous harmful substances, posing a significant threat to production safety and the overall safety of the workshop. Traditionally, a sheet metal enclosure is used to contain the fumes, allowing them to rise to a certain height and be collected and filtered by a cyclone dust collector before being discharged. However, the presence of the sheet metal obstructs the overhead crane, makes it impossible to assess the amount of residual fumes within the enclosure, and the sheet metal cannot be removed until all fumes are eliminated, allowing the fumes to spread throughout the workshop, affecting workers' vision and endangering their health.

[0003] Chinese patent CN111336566A discloses an adjustable air curtain and its control method. It primarily utilizes a variable air curtain system to improve the fume capture effect of a kitchen range hood. This allows for adjustments to the air curtain's outflow parameters based on changes in the range hood's exhaust volume, thus achieving a better air curtain effect. Primarily used in household kitchens, this air curtain system has a short operating stroke and is unsuitable for industrial applications such as oil quenching. Utility model patent CN202630183U discloses a range hood that relies on suction generated by a fan to draw in fumes from around the cookware. It uses a solid casing rather than an air curtain to confine the fumes, making it unsuitable for industrial forging applications as well. The utility model patent with authorization announcement number CN208865384U discloses a device for treating oily fume gas, which mainly treats inhaled oily fumes. However, it has poor ability to collect and capture oily fumes and cannot collect oily fumes over long distances. In addition, its device system is relatively complex and large, which is not conducive to its application in workshops that require overhead cranes. Summary of the Invention

[0004] To address the technical problems of the inability to determine the amount of residual oil fume in existing industrial heat treatment fumes and the low level of intelligence, this invention proposes a confined oil fume air curtain system and its control method. This system can intelligently control the air curtain to change synchronously with the quenching oil fume, and can control the expansion and contraction of the convergent-expansion nozzle device according to the size of the oil fume, thereby effectively absorbing, filtering and discharging the oil fume. This effectively intercepts oil fumes, improves the cleanliness of the workshop environment, and reduces the adverse effects of quenching oil fumes on workshop workers.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: a fume-trapping air curtain system includes a quenching oil tank and a cyclone fume extractor. The cyclone fume extractor is located directly above the quenching oil tank. An annular air outlet pipe is provided on the quenching oil tank. The annular air outlet pipe is connected to a fan through a duct. The airflow generated by the fan is ejected through the air outlet on the annular air outlet pipe to form an annular air curtain. The fan is connected to a control device. The cyclone fume extractor is located directly above the air curtain. A convergent-expanding nozzle is connected to the lower part of the cyclone fume extractor. A fume concentration probe II is located below the convergent-expanding nozzle. Both the convergent-expanding nozzle and the fume concentration probe II are connected to a nozzle regulator.

[0006] Preferably, the support is a hollow, funnel-shaped annular support, with the upper diameter of the annular support being larger than the lower diameter; and the lower part of the annular support is fixedly connected to the upper part of the quenching oil tank, and the lower part of the annular support is fixedly connected to the annular air outlet pipe; the upper part of the annular air outlet pipe is provided with a vertically upward air outlet, and the outer side of the annular air outlet pipe is connected to the fan through a circular opening and air pipe.

[0007] Preferably, an oil fume concentration probe is provided at the upper part of the quenching oil tank, an air velocity probe II is provided above the air outlet on the annular air outlet pipe, and an air velocity probe I is provided at the air inlet on the air duct between the annular air outlet pipe and the fan. The air velocity probe I, the oil fume concentration probe I, and the air velocity probe II are all connected to the control device.

[0008] Preferably, the control device includes a decoder, a signal feedback device, and a manual master control switch. Air velocity probe I, oil fume concentration probe I, and air velocity probe II are all connected to the decoder. The decoder is connected to the signal feedback device, the signal feedback device is connected to the speed adjustment device, the speed adjustment device is connected to the fan, and the manual master control switch is connected to the control device.

[0009] Preferably, the fan is a high-pressure fan, the motor of the high-pressure fan is an AC servo motor, and the AC servo motor is connected to a speed regulating device.

[0010] Preferably, the convergent-expanding nozzle includes nozzle blades and a connecting frame. The upper part of the connecting frame is connected to the inlet end of the lower part of the cyclone smoke eliminator. The nozzle blades are movably connected to the outer edge of the lower part of the connecting frame. A connecting mechanism is provided on the connecting frame. The end of the connecting mechanism is connected to the middle part of the nozzle blades. The connecting mechanism is connected to the nozzle adjuster.

[0011] Preferably, the upper part of the nozzle blade is connected to the outer edge of the lower part of the connecting frame via a hinge; the nozzle regulator includes a signal device and a driver, the oil fume concentration probe II is connected to the signal device, the signal device is connected to the driver, and the driver is connected to the connecting mechanism.

[0012] Preferably, the diameter of the nozzle blade in its natural state is the same as the diameter of the air curtain.

[0013] Preferably, the inlet wind speed measured by air velocity probe I, the oil fume concentration collected by oil fume concentration probe I, and the outlet velocity of the air curtain collected by air velocity probe II are all transmitted to the decoder. The decoder converts the analog signal into a digital signal. The signal feedback device compares the digital signal with a preset threshold. When the oil fume concentration is higher than the preset threshold, the signal feedback device sends an instruction to the speed regulation device to increase the speed regulation signal, thereby increasing the fan speed. When the oil fume concentration is lower than the preset threshold and the outlet velocity of the air curtain is greater than the preset speed threshold, the signal feedback device sends an instruction to the speed regulation device to decrease the speed regulation signal, thereby decreasing the fan speed.

[0014] Preferably, the signal device of the nozzle regulator receives and analyzes the oil fume concentration data measured by the oil fume concentration probe II. When the oil fume concentration data is lower than the preset oil fume concentration threshold, the signal device sends a control command to the driver of the nozzle regulator to adjust the connecting mechanism of the convergent-expanding nozzle to contract, thereby driving the nozzle blades to converge, so that the gas from the air curtain overflows from the side of the convergent-expanding nozzle and does not enter the cyclone smoke eliminator. When the oil fume concentration data is higher than the preset oil fume concentration threshold, the signal device controls the driver to adjust the connecting mechanism to extend, thereby driving the nozzle blades to expand, so that the mixed gas containing oil fumes enters the cyclone smoke eliminator for filtration and purification.

[0015] Compared with existing technologies, the beneficial effects of this invention are as follows: High-pressure gas generated by a high-pressure blower is ejected through an annular outlet pipe to form an annular air curtain, which is generated above the quenching oil tank. The cylindrical air curtain can surround the quenching oil fumes. Through air velocity probes, oil fume concentration probes, and signal feedback devices, the air curtain can move upward synchronously with the quenching oil fumes, i.e., the two change synchronously, preventing the quenching oil fumes from spreading to the surrounding areas of the workshop. At the same time, a convergent-expansion nozzle device is set at the flue gas inlet of the cyclone eliminator, which can intelligently and selectively absorb oil fumes, reducing the workload of the cyclone eliminator while greatly improving its efficiency and saving energy. This invention can intelligently control the air curtain to change synchronously with the quenching oil fumes, and can control the convergence-expansion nozzle device according to the size of the oil fumes. While preventing the quenching oil fumes from obstructing the vision of workshop workers and purifying the workshop environment, it can also reduce the harm of quenching oil fumes to workshop workers and significantly improve worker efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 for Figure 1 Side view of the bracket shown.

[0019] Figure 3 for Figure 1 The diagram shows the structure of the annular air outlet duct.

[0020] Figure 4 for Figure 1 The schematic diagram of the control device shown.

[0021] Figure 5 This is a schematic diagram of the convergence state of the convergent-expanding nozzle of the present invention.

[0022] Figure 6 This is a schematic diagram of the structure of the convergent-expanding nozzle expansion state of the present invention.

[0023] Figure 7 This is a schematic diagram of the connecting frame for the convergent-expanding nozzle of the present invention.

[0024] Figure 8 This is a schematic diagram of the connection mechanism of the convergent-expanding nozzle of the present invention.

[0025] Figure 9 This is a schematic diagram of the nozzle blade structure of the convergent-divergent nozzle of the present invention.

[0026] In the diagram, 1 is the quenching oil tank, 2 is the support, 3 is the annular air outlet duct, 4 is the fan, 5 is the control device, 6 is the air velocity probe I, 7 is the air curtain, 8 is the oil fume, 9 is the oil fume concentration probe I, 10 is the air velocity probe II, 11 is the convergent-divergent nozzle, 12 is the nozzle regulator, 13 is the cyclone smoke remover, 14 is the oil fume concentration probe II, 15 is the manual master control switch, 16 is the decoder, 17 is the signal feedback device, 18 is the speed regulation device, 19 is the connecting frame, 20 is the hinge, 22 is the connecting mechanism, and 23 is the nozzle blade. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that when a component is referred to as "fixed," "set," or "connected" to another component, it may be located directly or indirectly on that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or position based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "More" means two or more, unless otherwise explicitly defined.

[0029] Example 1

[0030] like Figure 1 As shown, a fume-trapping air curtain system includes a quenching oil tank 1 and a cyclone fume extractor 13. The cyclone fume extractor 13 is located directly above the quenching oil tank 1, positioned at the top of the workshop above the fume, and is used to absorb and filter the fume generated by the quenching oil tank 1 before discharging it outside the workshop. An annular air outlet duct 3 is provided on the quenching oil tank 1, connected to a fan 4 via a duct. The airflow generated by the fan 4 is ejected through the outlet on the annular air outlet duct 3, forming an annular air curtain 7. This air curtain surrounds the fume above the quenching oil tank 1, preventing the fume from spreading to the surrounding area. The fan 4 is connected to a control device 5, which controls the fan speed, thereby adjusting the airflow speed of the formed air curtain. The control device 5 adjusts the fan speed based on signal feedback from the air velocity probe II10 and the fume concentration probe I9, ensuring that the air curtain speed 7 is synchronized with the size of the fume 8. The invention has a high degree of intelligence, and the air curtain 7 formed is relatively stable. Because a relatively closed space is formed in the vertical upward direction of the circumference of the oil pool, the channel for the oil fume to diffuse outward is blocked. The oil fume cannot pass through the high-speed airflow curtain wall, thus playing the role of isolating the oil fume. Finally, when the oil fume rises to the top under the action of lift, it is adsorbed and filtered by the cyclone smoke remover 13.

[0031] A cyclone eliminator 13 is positioned directly above the air curtain. A convergent-divergent nozzle 11 is connected to the lower part of the cyclone eliminator 13. The nozzle blades of the convergent-divergent nozzle 11 can converge and expand, thereby adjusting whether to collect oil fumes from the periphery of the air curtain. An oil fume concentration probe II 14 is located below the convergent-divergent nozzle 11. Both the convergent-divergent nozzle 11 and the oil fume concentration probe II 14 are connected to a nozzle regulator 12. The oil fume concentration probe II 14 at the inlet of the cyclone eliminator measures the oil fume content in the air from the air curtain. The nozzle regulator 12 controls the convergent-divergent nozzle 11 to be in either a convergent or expanded state based on the oil fume concentration data detected by the oil fume concentration probe II 14. The oil fume concentration probe 14 uses a porous sieve sensor. When carbon black particles enter the sensor, the pores receive them, increasing the sieve's resistance and causing a change in the sensor's current intensity. This means there's a linear (proportional) relationship between the current intensity and the smoke concentration, allowing the oil fume concentration to be calculated based on the electric field (current) intensity. The nozzle regulator 12 controls the convergence-expansion nozzle 11 based on the strength of the current signal, selectively absorbing air from the air curtain and reducing the workload of the cyclone dust collector 13. This invention utilizes a high-pressure fan 4 to generate high-pressure gas, which is then ejected from the outlet of a circular air duct 3 to form a circular air curtain. This air curtain is generated above the quenching oil tank through the circular air duct 3. The cylindrical air curtain wall surrounds the oil fumes generated during quenching, restricting the oil fumes to move vertically upwards and preventing them from spreading outwards before reaching the cyclone dust collector 13. The air velocity probe II10, the oil fume concentration probe I9, and the control device 5 ensure that the oil fumes and the air curtain wall are generated synchronously. Finally, the oil fumes enter the cyclone dust collector for absorption, filtration, and discharge. This effectively intercepts oil fumes, improves the cleanliness of the workshop environment, and reduces the adverse effects of quenching oil fumes on workshop workers.

[0032] like Figure 2 As shown, the support 2 is a hollow, funnel-shaped annular support, with the upper diameter of the annular support being larger than the lower diameter. The lower part of the annular support is fixedly connected to the upper part of the quenching oil tank 1, and the upper part is fixedly connected to the annular air outlet pipe 3. The support 2 includes two metal rings, each divided into upper and lower parts. The diameter of the upper metal ring is larger than that of the lower metal ring. The lower metal ring is fitted onto the quenching oil tank 1 and fixed to it with screws. The upper metal ring is connected to the annular air outlet pipe 3 by welding.

[0033] The upper part of the annular air outlet duct 3 is provided with a vertically upward air outlet, and the outer side of the annular air outlet duct 3 is connected to the fan 4 through a circular opening 32 and an air duct 31. Figure 3As shown, the annular air outlet duct 3 comprises two parts: a quarter-circle and a three-quarter-circle. These two parts are not connected and form a complete annular structure. A circular opening connects the two parts, and both parts are connected to the fan 4 via duct 31, ensuring smooth airflow. The gas generated by the high-pressure fan fills the entire annular air outlet duct 3 through the high-pressure duct and is then ejected from the outlet. The outlet has a very small opening and is vertically upward. The high-speed, vertically upward air ejected from the annular outlet forms an annular air curtain.

[0034] Oil fume concentration probe I 9 is vertically suspended above the quenching oil tank 1 via a wire. Oil fume concentration probe I 9 is used to measure the oil fume concentration of oil fumes 8 above the quenching oil tank 1. An air velocity probe II 10 is installed above the air outlet on the annular air outlet duct 3. Air velocity probe II 10 is used to measure the air velocity at the outlet of the annular air outlet duct. An air velocity probe I 6 is installed at the air inlet on the duct between the annular air outlet duct 3 and the fan 4. Air velocity probe I 6, oil fume concentration probe I 9, and air velocity probe II 10 are all connected to the control device 5. The air velocity data and oil fume concentration data at the outlet of the annular air outlet duct are transmitted to the control device via wireless signal. The control device 5 can adjust the speed of the fan 4 to ensure that the formation of the air curtain and the generation of oil fumes change synchronously. Air velocity probes I6 and II10 have built-in electromagnetic coils. The air velocity probes generate electromagnetic induction when the air flows. The electromagnetic induction changes according to the change in air velocity. The speed sensor can detect this change and convert it into an electrical signal. Then the speed sensor converts the electrical signal into an electronic signal. The electronic signal can be detected by the control device 5, so the control device 5 controls the magnitude of the air curtain speed according to the electronic signal.

[0035] like Figure 4As shown, the control device 5 includes a decoder 16, a signal feedback device 17, and a manual master control switch 15. Air velocity probe I6, oil fume concentration probe I9, and air velocity probe II10 are all connected to the decoder 16. The decoder 16 is connected to the signal feedback device 17, which is connected to the speed regulation device 18, which is connected to the fan 4. The manual master control switch 15 controls the opening and closing of the entire system. It is connected to the control device 5 and located upstream of it. The manual master switch 15 is turned on in advance when operation is required. The decoder 16 receives and decodes the electronic signals from the air velocity probe I6, oil fume concentration probe I9, and air velocity probe II10. According to the RS485 communication protocol, it transmits the specific speed and oil fume concentration values ​​to the signal feedback device 17, forming a digital signal that is then transmitted to the signal feedback device 17. The signal feedback device 17 contains a resistor. The digital signal controls the voltage of the high-pressure fan by changing the resistance through a sensor, which in turn controls the speed of the high-pressure fan through the speed regulation device 18. The digital signal decoded from decoder 16 is analyzed and converted into a corresponding voltage signal, which is then transmitted to speed regulation device 18 to control the speed of the high-pressure blower. When the oil fume concentration is high, the speed regulation signal is increased, thereby increasing the speed of high-pressure blower 4 to maintain the stability of the air curtain system with a stronger airflow. When the oil fume concentration is low, the generated speed signal is also smaller, thereby reducing the speed of high-pressure blower 4 to control the oil fume with a weaker air curtain when the amount of oil fume is small. This can significantly reduce the load on cyclone smoke extractor 13 and has extremely high energy efficiency.

[0036] Furthermore, the fan 4 is a high-pressure fan, and the motor of the high-pressure fan is an AC servo motor, not a traditional three-phase motor. The AC servo motor is connected to the speed regulation device 18. Compared with traditional motors, the AC servo motor operates very smoothly, does not lose steps at high speeds, can effectively reduce the occurrence of turbulence pulsation, can quickly respond to signals, and thus maintain the stability of the curtain wall more efficiently, with high control precision.

[0037] like Figure 5 and Figure 6 As shown, the convergent-divergent nozzle 11 is located at the inlet of the cyclone dust collector 13. The convergent-divergent nozzle 11 includes nozzle blades 23 and a connecting frame 19, as shown. Figure 7 As shown, the connecting frame 19 is a circular support. The upper part of the connecting frame 19 is fixedly connected to the lower inlet end of the cyclone dust collector 13 by bolts. A nozzle blade 23 is movably connected to the outer edge of the lower part of the connecting frame 19, and the nozzle blade 23 can rotate relative to the connecting frame. A connecting mechanism 22 is provided on the connecting frame 19, and the end of the connecting mechanism 22 is connected to the middle of the outer side of the nozzle blade 23. The connecting mechanism 22 is connected to the nozzle adjuster 12, as shown... Figure 8As shown, the connecting mechanism 22 is fixed on the outside of the connecting frame 19, and the nozzle adjuster 12 is used to control the extension and retraction of the connecting mechanism 22, thereby driving the nozzle blade 23 to converge and expand.

[0038] like Figure 9 As shown, the upper part of the nozzle blade 23 is connected to the outer edge of the lower part of the connecting frame 19 via a hinge 20. The connecting mechanism 22 can drive the blade to rotate around the hinge, thereby meeting the needs of nozzle expansion and contraction. The nozzle regulator 12 includes a signal device and a driver. The oil fume concentration probe II 14 is connected to the signal device, the signal device is connected to the driver, and the driver is connected to the connecting mechanism 22. The driver can control the connecting mechanism while being adjusted by the signal device, completing the extension and retraction of the connecting mechanism, and thus controlling the convergence and expansion of the nozzle blade. The signal device can receive and analyze the oil fume concentration data emitted by the oil fume concentration probe II 14. When the oil fume concentration data is too low, the signal device controls the driver to adjust the convergence-expansion nozzle 11, so that the gas from the air curtain can overflow from the side of the convergence-expansion nozzle 11 without entering the cyclone dust collector, but diffuses into the workshop. At this time, the oil fume contained in the air curtain is lower than the set threshold, and the exhaust into the workshop does not affect the air quality of the workshop. When the oil fume concentration is high, the signal device controls the driver to adjust the expansion of the convergent-expansion nozzle 11, so that the mixed gas containing oil fumes enters the cyclone smoke removal device for filtration and purification.

[0039] The diameter of the nozzle blades 23 in their natural state is the same as the diameter of the air curtain. When the converging-diverging nozzle 11 neither converges nor expands, its diameter is the same as the diameter of the air curtain. The cyclone fume extractor 13 can completely absorb oil fumes and selectively absorb some of the air containing oil fumes, while filtering harmful substances in the oil fumes, and finally discharging them to the outside of the workshop through pipes.

[0040] The working principle of this invention is as follows: When preparing to quench the workpiece, the manual main control switch 15 is turned on in advance. At this time, the air velocity probe I6 and the oil fume concentration probe I9 start working. When the high-temperature workpiece is placed into the quenching oil tank 1, a large amount of oil fume 8 is generated and reaches the oil fume concentration probe I9. At this time, the oil fume concentration probe I9 transmits the oil fume concentration signal to the signal feedback device 17 via a wireless signal. The signal feedback device 17 causes the high-pressure blower 4 to rotate rapidly through the speed adjustment device 18 in the control device, spraying out a large amount of high-pressure, high-speed airflow to form a cylindrical annular air curtain, and the oil fume cannot cross the air curtain. After a period of time, when the amount of oil fume decreases, the speed adjustment device 18 reduces the speed of the high-pressure blower 4 to maintain the air curtain with a weaker airflow speed. The whole process does not require human intervention, has a high degree of intelligence and automation, and also reduces the load on the cyclone smoke extractor 13, resulting in high energy efficiency.

[0041] Example 2

[0042] A control method for a fume-trapping air curtain system includes transmitting the inlet wind speed measured by air velocity probe I6, the fume concentration collected by fume concentration probe I9, and the outlet air velocity of the air curtain collected by air velocity probe II10 to decoder 16. Decoder 16 converts the analog signals into digital signals, and signal feedback device 17 compares the digital signals with a preset threshold, which is based on the fume emission standard of 2.0 mg / m³. 3 The following settings are configured. When the oil fume concentration is higher than the preset threshold, the signal feedback device 17 sends an instruction to the speed regulation device 18 to increase the speed regulation signal, thereby increasing the rotational speed of the fan 4; when the oil fume concentration is lower than the preset threshold and the outlet speed of the air curtain is greater than the preset speed threshold, the signal feedback device 17 sends an instruction to the speed regulation device 18 to decrease the speed regulation signal, thereby reducing the rotational speed of the fan 4.

[0043] The other structures and methods are the same as in Example 1.

[0044] Example 3

[0045] A control method for a fume-trapping air curtain system is disclosed. The signal receiver of the nozzle regulator 12 receives and analyzes fume concentration data measured by the fume concentration probe II14. When the fume concentration data is lower than a preset fume concentration threshold, the signal receiver sends a control command (generated by a control device) to the actuator of the nozzle regulator 12 to adjust the contraction of the connecting mechanism 22 of the convergent-expanding nozzle 11, thereby causing the nozzle blades 23 to converge. Figure 5 As shown, this causes the gas from the air curtain to overflow from the side of the convergent-expanding nozzle 11 without entering the cyclone dust collector 13. When the oil fume concentration data is higher than the preset oil fume concentration threshold, the signal device controls the driver to adjust the extension of the connecting mechanism 22, thereby driving the nozzle blades 23 to expand, as shown. Figure 6 As shown, the mixed gas containing oil fumes enters the cyclone smoke eliminator 13 for filtration and purification.

[0046] The other structures and methods are the same as in Example 2.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control method of a fume-binding air curtain system, characterized by, The application relates to a bound oil fume air curtain system which comprises a quenching oil pool (1) and a cyclone fume remover (13), the cyclone fume remover (13) is arranged above the quenching oil pool (1), a ring-shaped air outlet pipe (3) is arranged on the quenching oil pool (1), the ring-shaped air outlet pipe (3) is connected with a fan (4) through an air pipe, air flow generated by the fan (4) is sprayed out through air outlets on the ring-shaped air outlet pipe (3) to form a ring-shaped air curtain, the fan (4) is connected with a control device (5); the air curtain is provided with the cyclone fume remover (13) above, the cyclone fume remover (13) is connected with a converging-diverging nozzle (11) at the lower part, the converging-diverging nozzle (11) is provided with an oil fume concentration probe II (14) at the lower part, and the converging-diverging nozzle (11) and the oil fume concentration probe II (14) are connected with a nozzle regulator (12); The quenching oil pool (1) is provided with an oil fume concentration probe I (9) at the upper part, the air outlets on the ring-shaped air outlet pipe (3) are provided with an air speed probe II (10) above, and the air pipe between the ring-shaped air outlet pipe (3) and the fan (4) is provided with an air speed probe I (6) at the air inlet; the air speed probe I (6), the oil fume concentration probe I (9) and the air speed probe II (10) are connected with the control device (5); The control device (5) comprises a decoder (16), a signal feedback device (17) and a manual total control switch (15), the air speed probe I (6), the oil fume concentration probe I (9) and the air speed probe II (10) are connected with the decoder (16), the decoder (16) is connected with the signal feedback device (17), the signal feedback device (17) is connected with a speed adjusting device (18), the speed adjusting device (18) is connected with the fan (4), and the manual total control switch (15) is connected with the control device (5); the converging-diverging nozzle (11) comprises a nozzle blade (23) and a connecting frame (19), the upper part of the connecting frame (19) is connected with an inlet end of the lower part of the cyclone fume remover (13), the outer edge of the lower part of the connecting frame (19) is movably connected with the nozzle blade (23), the connecting frame (19) is provided with a connecting mechanism (22), and the end of the connecting mechanism (22) is connected with the middle part of the nozzle blade (23); the connecting mechanism (22) is connected with the nozzle regulator (12); The upper part of the nozzle blade (23) is connected with the outer edge of the lower part of the connecting frame (19) through a hinge (20); the nozzle regulator (12) comprises a signaler and a driver, the oil fume concentration probe II (14) is connected with the signaler, the signaler is connected with the driver, and the driver is connected with the connecting mechanism (22); The diameter of the nozzle blade (23) in the natural state is the same as the diameter of the air curtain, and the cyclone fume remover (13) can completely absorb oil fume and selectively absorb air containing oil fume. The air inlet speed measured by the air speed probe I (6), the oil fume concentration collected by the oil fume concentration probe I (9) and the outlet speed of the air curtain air collected by the air speed probe II (10) are all transmitted to the decoder (16), the decoder (16) converts the analog signals into digital signals, the signal feedback device (17) compares the digital signals with the preset threshold value, when the oil fume concentration is higher than the preset threshold value, the signal feedback device (17) sends the instruction of increasing the speed adjustment signal to the speed adjustment device (18), so as to increase the rotating speed of the fan (4); when the oil fume concentration is lower than the preset threshold value and the outlet speed of the air curtain air is greater than the preset speed threshold value, the signal feedback device (17) sends the instruction of reducing the speed adjustment signal to the speed adjustment device (18), so as to reduce the rotating speed of the fan (4); The signaler of the nozzle regulator (12) receives the oil fume concentration data measured by the oil fume concentration probe II (14) and analyzes, when the oil fume concentration data is lower than the preset oil fume concentration threshold value, the signaler sends the control instruction to the driver of the nozzle regulator (12) to adjust the connection mechanism (22) of the converging-diverging nozzle (11) to contract, so as to drive the nozzle blade (23) to converge, so that the gas from the air curtain overflows from the side of the converging-diverging nozzle (11) without entering the cyclone smoke remover (13); when the oil fume concentration data is higher than the preset oil fume concentration threshold value, the signaler adjusts the connection mechanism (22) to elongate through the control of the driver, so as to drive the nozzle blade (23) to expand, so that the mixed gas containing oil fume enters the cyclone smoke remover (13) for filtering and purification.

2. The control method of the oil fume air curtain system according to claim 1, wherein, The support (2) is a hollow, trumpet-shaped annular support, the diameter of the upper part of the annular support is greater than the diameter of the lower part of the annular support; the lower part of the annular support is fixedly connected with the upper part of the quenching oil pool (1), and the upper part of the annular support is fixedly connected with the annular air outlet pipe (3); the upper part of the annular air outlet pipe (3) is provided with a vertical upward air outlet, and the outer side of the annular air outlet pipe (3) is connected with the fan (4) through a circular port and an air pipe.

3. The control method of the oil fume air curtain system according to claim 1, wherein, The fan (4) is a high-pressure fan, the motor of the high-pressure fan is an alternating current servo motor, and the alternating current servo motor is connected with the speed adjustment device (18).

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