A hot plume capturing device based on high-speed jet flow induction and an operating method thereof

Abstract

The application discloses a hot plume trapping device and operation method based on high-speed jet flow induction, which comprises a cooking bench and an oil smoke extractor, a chimney is connected above the oil smoke extractor, a high-speed jet flow air supply port is arranged at the top center of the cooking bench, an air inlet grille is arranged at the bottom of the high-speed jet flow air supply port, the air inlet grille sequentially passes through a steel wire safety net, a fan and a stable airflow grille and then enters a noise elimination static pressure box, a converging nozzle is arranged at the top of the noise elimination static pressure box, the converging nozzle is connected with the high-speed jet flow air supply port in communication, and a monitoring intelligent control module is arranged at the bottom of a smoke collecting cover of the oil smoke extractor. The intelligent automatic control system is adopted to reasonably control the exhaust capacity of the oil smoke extractor and the strength of the high-speed jet flow, so that the strength of the high-speed jet flow is adapted to the current exhaust flow field, the oil smoke is quickly exhausted, and unnecessary energy consumption and noise are reduced.

Description

Technical Field

[0001] This invention relates to the field of oil fume thermal plume control technology, specifically to a thermal plume collection device and its operation method based on high-speed jet induction. Background Technology

[0002] People are increasingly concerned about the health impact of indoor air quality, and the hot plume of cooking fumes from indoor kitchens is the primary source of indoor air pollution. During cooking, the local exhaust system in a typical kitchen—the range hood—cannot completely and promptly remove the cooking fumes, causing indoor air pollution and harming people's health. To further improve the capture efficiency of range hoods, researchers have proposed different performance optimization methods for top-mounted range hood systems designed for two-burner stovetops. These include patents such as those with four-way airflow from an air curtain and those with additional kitchen air supply, such as those with application numbers CN200820232003.8, CN201220016658.8, and CN201810658414.1. These patents use an air curtain to supply air from four sides around the stove, but slight changes in parameters can disrupt the flow field, leading to reduced capture efficiency. Patents such as those with application numbers CN201110327839.2, CN202021559392.2, and CN202020653650.7 add a jet air supply device next to the range hood to form an air curtain to shield the fumes from overflowing. However, these patents generally use ordinary nozzles and slotted air outlets, resulting in uneven jet distribution and rapid velocity decay, which affects the stability of the air curtain and leads to poor shielding effect. Four-burner stoves are more difficult to control than two-burner stoves, and there is an urgent need for a high-efficiency capture device and system for controlling the heat plume of kitchen fumes. Summary of the Invention

[0003] To overcome the above technical problems, the present invention aims to provide a thermal plume capture device and operating method based on high-speed jet induction. This device involves adding a high-speed jet air outlet in the center of a four-burner stove in the kitchen to induce fumes into the range hood's exhaust hood. A gradually converging nozzle with reduced pressure and increased speed is used to lower the jet's attenuation rate. Perforated plates and honeycomb elements are added to the air outlet to increase the uniformity of the velocity distribution. Furthermore, an intelligent automatic control system is used to rationally control the exhaust volume of the range hood and the intensity of the high-speed jet, adapting the high-speed jet intensity to the current exhaust flow field. This allows for rapid exhaust of fumes while reducing unnecessary energy consumption and noise.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A thermal plume capture device based on high-speed jet induction includes a stove 1 and a range hood 2. A chimney 3 is connected above the range hood 2. A high-speed jet air outlet 4 is set at the center above the stove 1. An air inlet grille 7 is set at the bottom of the high-speed jet air outlet 4. The air inlet grille 7 passes through a steel wire safety net 9, a fan 5, and a stabilizing airflow grille 8 in sequence before entering a silencing static pressure box 6. A tapered nozzle 14 is set at the top of the silencing static pressure box 6. The tapered nozzle 14 is connected to the high-speed jet air outlet 4. A monitoring and intelligent control module is set at the bottom of the smoke collection hood of the range hood 2.

[0006] The gas inside the converging nozzle 14 moves in a state of decreasing pressure and increasing speed. The cross-sectional area of ​​the converging nozzle 14 gradually decreases along the direction of gas flow. The converging part is conical in shape, and the apex angle of the converging cone is 40°.

[0007] The high-speed jet air outlet is equipped with four perforated plates 12 and honeycomb devices 13. The perforated plate 12 has a hole diameter of 3mm, and the honeycomb device 13 has a hole diameter of 8mm.

[0008] The monitoring and intelligent control module includes an air vent smoke sensor 10 and an external smoke sensor 11. The air vent smoke sensor 10 is used to monitor the pollutant concentration at the hood opening in real time and is located at the bottom right side of the hood opening below the range hood 2. The external smoke sensor 11 is used to monitor the pollutant concentration in the external space outside the edge of the hood opening below the range hood 2 in real time, to obtain the initial environmental concentration and the amount of oil fume escaping. It is located at the outer right edge of the hood opening below the range hood 2.

[0009] The stabilized airflow grille 8 is a linear strip grille with 10 strip grille blades, used to stabilize the airflow distribution.

[0010] The silencing static pressure box 6 has sound-absorbing material attached inside the box to absorb sound energy and reduce noise. It can both allow airflow to pass through and effectively prevent or weaken the outward propagation of sound energy. The silencing static pressure box 6 is used to convert part of the dynamic pressure into static pressure so that the wind can blow further, distribute the air volume evenly, and reduce dynamic pressure loss.

[0011] The high-speed jet air outlet 4 has the same outlet area as the tapered nozzle 14.

[0012] The air intake grille 7 is a linear bar grille with 10 bar grille blades. The air intake grille 7 is generally installed flush with the ground, and the ground needs to be raised. The air intake grille 7 is used to prevent debris from entering the system and reduce the air resistance of the intake.

[0013] The fan 5 is a DC centrifugal fan (radial fan) to eliminate the vortex mode provided by the axial fan.

[0014] The high-speed jet air outlet 4 has a circular opening to ensure a smooth flow path and reduce frictional resistance.

[0015] A method for operating a thermal plume capture device based on high-speed jet induction includes the following steps;

[0016] (1) When the user turns on the machine, the range hood 2 starts running;

[0017] (2) The external smoke sensor 11 acquires the initial concentration of oil fumes in the indoor environment;

[0018] (3) The external smoke sensor 11 and the air vent smoke sensor 10 begin to acquire the oil fume data generated during the cooking process and transmit the detected data to the control system.

[0019] (4) The control system adjusts the magnitude and direction of the power supply module current according to the amount of oil smoke Q1 detected by the external smoke sensor 11 and the amount of oil smoke Q2 detected by the air outlet smoke sensor 10 per unit time, thereby controlling the air volume of the range hood 2 and the fan 5, realizing automatic and intelligent control of the exhaust speed of the range hood and the air outlet speed of the high-speed jet air outlet 4, which is more efficient and energy-saving.

[0020] In step (4), when it is determined that there is a large amount of oily smoke escaping to a small extent: at this time, the amount of oily smoke Q1 detected by the air vent smoke sensor 10 is greater than the amount of oily smoke Q that the range hood 2 can extract at its lowest setting. min The amount of oil fumes Q2 detected by the external smoke sensor 11 is not greater than the amount of oil fumes Q that the range hood 2 can extract at its highest setting. max That is, Q1 > Q min Q2≤Q max At this time, the corresponding adjustment method is: increase the exhaust speed of the range hood 2, and keep the high-speed jet fan 5 at the lowest speed;

[0021] In step (4), when it is determined that there is only a small amount of oil smoke escaping: at this time, the amount of oil smoke Q1 detected by the air vent smoke sensor 10 is not greater than the amount of oil smoke Q that the range hood 2 can extract at its lowest setting. min The amount of oil fumes Q2 detected by the external smoke sensor 11 is not greater than the amount of oil fumes Q that the range hood 2 can extract at its highest setting. max That is, Q1≤Q min Q2≤Q max When this happens, the corresponding adjustment method is to turn off the high-speed jet fan 5 and rely solely on the range hood 2 to extract the fumes.

[0022] In step (4), when it is determined that there is a large amount of oily smoke escaping: at this time, the amount of oily smoke Q1 detected by the air vent smoke sensor 10 is greater than the amount of oily smoke Q that the range hood 2 can extract at its lowest setting. min The amount of cooking fumes Q2 detected by the external smoke sensor 11 is greater than the amount of cooking fumes Q that the range hood 2 can extract at its highest setting. max That is, Q1 > Q minQ2 > Q max When this happens, the corresponding adjustment method is to increase the exhaust speed of the range hood 2 and increase the rotation speed of the high-speed jet fan 5 to induce the escaped fumes into the exhaust range of the range hood 2 in advance.

[0023] The Q min =10-14m 3 / min, the Q max =18-22m 3 / min, but not limited to these two values, can be determined according to the national standard GB / T 17713-2011 for range hoods and the specific model of the range hood.

[0024] The beneficial effects of this invention are:

[0025] 1. A high-speed jet air outlet is added to the center of the four-burner stove in the kitchen to guide the fumes into the range hood exhaust hood. This simplifies the flow field near the stove, avoids the influence of personnel disturbance, and uses the negative pressure induction effect of the high-speed jet to reduce the diffusion of fumes and improve the collection efficiency of the range hood.

[0026] 2. A tapered nozzle with pressure reduction and speed increase is used at the high-speed jet air outlet to reduce the jet attenuation rate. An orifice plate and honeycomb device are added to the air outlet to increase the uniformity of the velocity distribution at the orifice. A stable airflow grid and a silencer static pressure box are added above the fan to reduce the turbulence of the jet and effectively reduce noise, thereby effectively improving the induction efficiency of the high-speed jet.

[0027] 3. The system adopts an intelligent automatic control system, which monitors the concentration of pollutants in real time through flue gas quality sensors. Internal and external sensors are set up. The internal sensor is used to detect the amount of oil fume, and the external sensor is used to detect the initial ambient concentration and the amount of oil fume escape. By combining the data from the two sensors, the system adjusts the exhaust volume of the range hood and the air delivery speed of the high-speed jet according to the actual load, thereby reducing unnecessary energy consumption. Attached Figure Description

[0028] Figure 1 This is a usage state structure diagram of the integrated system according to an embodiment of the present invention.

[0029] Figure 2 This is a front view of the integrated system according to an embodiment of the present invention.

[0030] Figure 3 This is a side view of the integrated system according to an embodiment of the present invention.

[0031] Figure 4 This is a top view of the stove according to an embodiment of the present invention.

[0032] Figure 5 This is an exploded view of the high-speed jet air outlet structure according to an embodiment of the present invention.

[0033] Figure 6 This is a comparison of the Y-section velocity vector diagrams of the embodiment of the present invention and the ordinary system ((left) ordinary system, (right) embodiment of the present invention).

[0034] Figure 7 This is a comparison of the Y-section pollutant concentration distribution cloud maps of the embodiment of the present invention and the ordinary system ((left) ordinary system, (right) embodiment of the present invention).

[0035] Figure 8 This is a comparison of the escape trajectory diagrams of oil fume particles in the embodiment of the present invention and the ordinary system ((left) ordinary system, (right) embodiment of the present invention).

[0036] Figure 9 This is a comparison of the horizontal diffusion range of oil fume particles between the embodiment of the present invention and the ordinary system ((left) ordinary system, (right) embodiment of the present invention).

[0037] In the diagram, 1. Stove, 2. Range hood, 3. Chimney, 4. High-speed jet air outlet, 5. Fan, 6. Silencer static pressure box, 7. Air inlet grille, 8. Stabilizing airflow grille, 9. Steel wire safety net, 10. Air outlet smoke sensor, 11. External smoke sensor, 12. Orifice plate, 13. Honeycomb unit, 14. Converging nozzle. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to the embodiments.

[0039] As attached Figure 1 -Appendix Figure 5 As shown, a thermal plume capture device and control system based on high-speed jet induction includes: a stove 1 and a range hood 2. A chimney 3 is connected above the range hood 2. The range hood 2 is a top-mounted range hood, and its specific structure can adopt the structure of existing top-mounted range hoods. A high-speed jet air outlet 4 is set at the center above the stove 1. Air enters through the air inlet grille 7 and the steel wire safety net 9, and is delivered by the fan 5. The air then passes through the stabilizing airflow grille 8 and enters the silencer static pressure box 6. The air is then sent out from the high-speed jet air outlet 4 through the tapered nozzle 14, forming a high-speed jet that induces the hot plume of oil fumes to enter the range hood 2 and is discharged into the common flue from the chimney 3. A perforated plate 12 and a honeycomb device 13 are added to the high-speed jet air outlet 4 to improve the uniformity of the velocity distribution at the orifice.

[0040] This invention includes a monitoring and intelligent control module at the bottom of the smoke collection hood of the range hood 2. This module comprises an vent smoke sensor 10 and an external smoke sensor 11. The vent smoke sensor 10 is used to monitor the pollutant concentration at the hood opening in real time and is located on the bottom right side of the vent. The external smoke sensor 11 is used to monitor the pollutant concentration in the external space outside the hood opening in real time, obtaining the initial ambient concentration and the amount of oil fume escaping. It is located on the right edge of the smoke collection hood. The invention also includes a control module, which adjusts the magnitude and direction of the current in the power supply module based on the real-time monitoring information from the vent smoke sensors 10 and 11. This controls the airflow of the range hood 2 and the fan 5, achieving automatic and intelligent control of the exhaust speed of the range hood and the outlet speed of the high-speed jet, resulting in greater efficiency and energy saving. Finally, a power supply module is included to power the monitoring and control modules. Specifically, the devices disclosed in this invention include, but are not limited to, the following models: the vent smoke sensor 10 and the external smoke sensor 11 are AGNC002 smoke sensors manufactured by Shenzhen Hongruitai Electronics Co., Ltd. This product can communicate directly through configuration software, etc., which is convenient for secondary development; the control module includes a PLC controller and a relay. The PLC controller is a Mitsubishi PLC controller FX1S-14MR, and the relay is an Omron LY2N-J DC24 BY OMI general-purpose relay; the power supply module is the HCP series general-purpose DC power supply and AC-DC power supply module of Suzhou Pail Electromechanical. This product is small in size, uses PWM modulation, has low power consumption of the crystal module, high efficiency, and is more energy-saving. The input voltage AC is 220V, and the output voltage and output current are 0-rated values.

[0041] The blower 5 is a DC centrifugal blower (radial blower) to eliminate the vortex mode provided by the axial flow blower. The jet is delivered by the blower 5 through the tapered nozzle 14 from the high-speed jet outlet 4. The high-speed jet outlet 4 has a circular opening to ensure a smooth flow path and reduce frictional resistance. An orifice plate 12 and a honeycomb device 13 are added at the high-speed jet outlet 4. Preferably, the orifice plate 12 has a hole diameter of 3 mm and the honeycomb device 13 has a hole diameter of 8 mm.

[0042] Example 1:

[0043] The system of this invention includes a stove, a range hood, and a chimney. When the system is working, it includes the following steps: (1) The user turns on the machine and the range hood 2 starts to run; (2) The external smoke sensor 11 obtains the initial concentration of oil fumes in the indoor environment; (3) The external smoke sensor 11 and the air vent smoke sensor 10 begin to obtain the oil fume data generated during the cooking process and transmit the detected data to the control system; (4) The control system adjusts the magnitude and direction of the current of the power supply module according to the amount of oil fumes Q1 detected by the external smoke sensor 11 and the amount of oil fumes Q2 detected by the air vent smoke sensor 10 per unit time, thereby controlling the air volume of the range hood 2 and the fan 5, realizing automatic and intelligent control of the exhaust speed of the range hood and the air outlet speed of the high-speed jet air outlet 4, which is more efficient and energy-saving.

[0044] Furthermore, in step (4), when it is determined that there is a large amount of oily smoke escaping with a small amount of smoke: at this time, the amount of oily smoke Q1 detected by the air vent smoke sensor 10 is greater than the amount of oily smoke Q that the range hood 2 can extract at its lowest setting. min The amount of oil fumes Q2 detected by the external smoke sensor 11 is not greater than the amount of oil fumes Q that the range hood 2 can extract at its highest setting. max That is, Q1 > Q min Q2≤ Q max At this time, the corresponding adjustment method is: increase the exhaust speed of the range hood 2, and keep the high-speed jet fan 5 at the lowest speed;

[0045] Furthermore, in step (4), when it is determined that there is only a small amount of oil smoke escaping: at this time, the amount of oil smoke Q1 detected by the air vent smoke sensor 10 is not greater than the amount of oil smoke Q that the range hood 2 can extract at its lowest setting. min The amount of oil fumes Q2 detected by the external smoke sensor 11 is not greater than the amount of oil fumes Q that the range hood 2 can extract at its highest setting. max That is, Q1≤Q min Q2≤ Q max When this happens, the corresponding adjustment method is to turn off the high-speed jet fan 5 and rely solely on the range hood 2 to extract the fumes.

[0046] Furthermore, in step (4), when it is determined that there is a large amount of oily smoke escaping: at this time, the amount of oily smoke Q1 detected by the air vent smoke sensor 10 is greater than the amount of oily smoke Q that the range hood 2 can extract at its lowest setting. min The amount of cooking fumes Q2 detected by the external smoke sensor 11 is greater than the amount of cooking fumes Q that the range hood 2 can extract at its highest setting. max That is, Q1 > Q min Q2 > Q max When this happens, the corresponding adjustment method is to increase the exhaust speed of the range hood 2 and increase the rotation speed of the high-speed jet fan 5 to induce the escaped fumes into the exhaust range of the range hood 2 in advance.

[0047] Preferably, the Q described in this embodiment min =10-14m 3 / min, the Q max =18-22m 3 / min, but not limited to these two values, can be determined according to the national standard GB / T 17713-2011 for range hoods and the specific model of the range hood.

[0048] (5) Fresh air enters the room through the air inlet grille 7 and the steel wire safety net 9. The fan 5 delivers the air, and then the air enters the silencer static pressure box 6 through the stable airflow grille 8. The air is then sent out from the high-speed jet air outlet 4 in the center above the stove 1 through the converging nozzle 14, forming a high-speed jet that induces the hot plume of oil fumes to enter the range hood 2 and is discharged into the public flue from the chimney 3.

[0049] In this embodiment, the area f2 of the high-speed jet air outlet 4 is 156.25 mm². 2 It adopts a tapered nozzle 14 and a fan 5 with an air volume Q. c 475m 3 / h, so the nozzle exit velocity c c The following formula can be used for calculation:

[0050]

[0051] In summary, under the action of this system, the hot plumes of fumes generated during cooking are less likely to diffuse into the indoor environment, thus avoiding harm to the human body and pollution of the indoor environment.

[0052] Example 2:

[0053] This embodiment provides experimental verification for Embodiment 1 and compares the capture effect with that of a conventional oil fume hot plume capture system. The experimental results show that the present invention can effectively capture pollutants emitted from pollution sources. In this embodiment, CFD numerical simulation is used to conduct numerical experiments on fluid dynamics. This embodiment employs a component transport model and a discrete phase model. The component transport model can analyze the flow process of airflow between different gas components in detail, while the discrete phase model can obtain the motion process of particulate matter coupled with airflow.

[0054] In this embodiment, the test environment is a small residential kitchen with dimensions of 3.3m long * 3.3m wide * 2.4m high. A four-burner stove with a heat source diameter of 0.125m is located at the edge of the room. The work surface is divided into left and right sections in an L-shape, with the gas stove placed on the right section.

[0055] In this embodiment, the capture effect of the present invention is compared with that of the existing ordinary oil fume heat plume capture system. The boundary conditions of the existing ordinary oil fume heat plume capture system are shown in Table 1, and the boundary conditions of the system provided by the present invention are shown in Table 2.

[0056] Table 1. Simulation boundary conditions for existing conventional oil fume thermal plume capture systems

[0057]

[0058] Table 2. Simulation boundary conditions of the trapping system provided by the present invention

[0059]

[0060] The capture effect of this invention is significantly different from that of ordinary oil fume heat plume capture systems, as shown in Figures 6-9. Figure 6 This is a velocity vector diagram of the section at Y = 0.72m, where the horizontal and vertical axes represent spatial location. The diagram shows the velocity vector distribution, characterizing the magnitude and direction of the velocity in the indoor flow field. Figure 6 (Left) It can be seen that the current range hood's fume extraction effect is poor, with a large amount of fumes escaping outside the hood and spreading horizontally along the ceiling of the room. Further optimization of the range hood or kitchen ventilation system is needed. Figure 6 (Right) It can be seen that the high-speed jet induces a significant effect. Compared with the ordinary oil fume heat plume capture system, the oil fumes escaping laterally from the range hood opening are significantly reduced. Most of the oil fumes are concentrated inside the range hood and eventually captured, indicating that the capture effect of the present invention is better.

[0061] Figure 7 This is a concentration contour plot for the Y = 0.72m section, with the horizontal and vertical axes representing spatial location, and the values ​​on the isobars representing concentration distribution. Figure 7 (Left) It can be seen that the initial pollutant mass fraction of the cooking fumes was 0.16, which decreased to about 0.03 after rising to near the range hood vent. This shows that the pollutant mass fraction of the cooking fumes decreases relatively quickly under the influence of the range hood, but it still has a certain impact on the surrounding environment. The pollutant mass fraction near the heat source is 0.08, which is about 0.06 higher than indoors. Due to the poor capture effect of the existing range hood, the hot plume of cooking fumes escapes laterally at the range hood vent, causing the pollutant concentration at the top of the room to stratify. Figure 7 (Right) It can be seen that the initial pollutant mass fraction of the oil fume was 0.16, which decreased to about 0.09 after rising to near the range hood vent. This shows that the pollutant mass fraction of the oil fume decreased slowly under the influence of the capture system of this invention, resulting in a small impact on the surrounding environment. The pollutant mass fraction near the heat source was 0.02, which is basically the same as indoors. Compared with ordinary oil fume heat plume capture systems, the pollutant concentration was significantly reduced.

[0062] Figure 8 This is a map showing the escape trajectory of oil fume particles. Figure 8 (Left) It can be seen that under the action of a conventional oil fume heat plume capture system, the spatial escape range of oil fume particles is relatively large, mainly escaping towards the top of the room after being emitted from the heat source. Figure 8 (Right) It can be seen that the spatial escape range of oil fume particles is significantly reduced under the action of the capture system of the present invention, and most of the particles are captured by the range hood. Figure 9 This is a diagram showing the horizontal diffusion range of oil fume particles. Figure 9 (Left) It can be seen that under the action of a conventional oil fume thermal plume capture system, the horizontal diffusion radius of the oil fume particles exceeds the stovetop, reaching a distance of approximately 1.3 meters. The diffusion is relatively far, mainly spreading horizontally towards the corners of the walls and the human breathing zone. Figure 9 (Right) As can be seen, under the action of the capture system of this invention, the horizontal diffusion radius of oil fume particles is significantly reduced, from 1.3m to about 0.7m. This indicates that the capture system of this invention reduces the escape and diffusion range of particles. In summary, this invention can effectively capture most oil fumes, resulting in a significant decrease in the concentration of gaseous pollutants and particulate matter in the kitchen. Compared to ordinary oil fume thermal plume capture systems, the capture effect of this invention is superior.

Claims

1. A thermal plume trapping device based on high-speed jet induction, characterized in that, The range hood includes a stove (1) and a range hood (2). A chimney (3) is connected above the range hood (2). A high-speed jet air outlet (4) is set in the center above the stove (1). An air inlet grille (7) is set at the bottom of the high-speed jet air outlet (4). The air inlet grille (7) passes through a steel wire safety net (9), a fan (5), and a stable airflow grille (8) before entering a silencing static pressure box (6). A tapered nozzle (14) is set at the top of the silencing static pressure box (6). The tapered nozzle (14) is connected to the high-speed jet air outlet (4). A monitoring and intelligent control module is set at the bottom of the smoke collection hood of the range hood (2). The gas in the converging nozzle (14) moves in a state of decreasing pressure and increasing speed. The cross-sectional area of ​​the converging nozzle (14) gradually decreases along the direction of gas flow. The converging part is conical in shape and the apex angle of the converging cone is 40°. A perforated plate (12) and a honeycomb device (13) are added to the high-speed jet air outlet (4). The perforated plate (12) has a hole diameter of 3 mm, and the honeycomb device (13) has a hole diameter of 8 mm. The monitoring and control module includes an air vent smoke sensor (10) and an external smoke sensor (11). The air vent smoke sensor (10) is used to monitor the pollutant concentration at the hood opening in real time and is located at the bottom right side of the hood opening below the range hood (2). The external smoke sensor (11) is used to monitor the pollutant concentration in the external space outside the edge of the hood opening below the range hood (2) in real time, and to obtain the initial environmental concentration and the amount of oil fume escape. It is located at the right outer edge of the hood opening below the range hood (2). The air intake grille (7) is a linear bar grille with 10 bar grille blades. The air intake grille (7) is flush with the ground and the ground needs to be raised. The air intake grille (7) is used to prevent debris from entering the system and reduce the air resistance of the intake. The fan (5) is a DC centrifugal fan to eliminate the vortex mode provided by the axial fan.

2. The thermal plume trapping device based on high-speed jet induction as described in claim 1, characterized in that, The stabilized airflow grille (8) is a linear bar grille with 10 bar grille blades, used to stabilize the airflow distribution.

3. The thermal plume trapping device based on high-speed jet induction as described in claim 1, characterized in that, The silencing static pressure box (6) has sound-absorbing material attached inside the box to absorb sound energy and reduce noise. The silencing static pressure box (6) is used to convert part of the dynamic pressure into static pressure so that the wind can blow further, distribute the air volume evenly, and reduce dynamic pressure loss.

4. A thermal plume trapping device based on high-speed jet induction as described in claim 1, characterized in that, The high-speed jet air outlet (4) has the same outlet area as the tapered nozzle (14); The high-speed jet air outlet (4) has a circular opening to ensure a smooth flow path and reduce frictional resistance.

5. A method for operating a thermal plume trapping device based on high-speed jet induction as described in any one of claims 1-4, characterized in that, Includes the following steps; (1) When the user turns on the machine, the range hood (2) starts running; (2) External smoke sensor (11) acquires the initial concentration of oil fume in the indoor environment; (3) The external smoke sensor (11) and the air vent smoke sensor (10) begin to acquire the oil fume data generated during the cooking process and transmit the detected data to the control system; (4) The control system adjusts the magnitude and direction of the power supply module current according to the amount of oil smoke Q1 detected by the external smoke sensor (11) and the amount of oil smoke Q2 detected by the air outlet smoke sensor (10) per unit time, thereby controlling the air volume of the range hood (2) and the fan (5), realizing automatic intelligent control of the exhaust speed of the range hood and the air outlet speed of the high-speed jet air outlet (4), which is more efficient and energy-saving.

6. The operating method of the thermal plume trapping device based on high-speed jet induction as described in claim 5, characterized in that, In step (4), when it is determined that there is a large amount of oily smoke escaping to a small extent: at this time, the amount of oily smoke Q1 detected by the air vent smoke sensor (10) is greater than the amount of oily smoke Q that the range hood (2) can extract at its lowest setting. min The amount of oily smoke Q2 detected by the external smoke sensor (11) is not greater than the amount of oily smoke Q that the range hood (2) can extract at its highest setting. max That is, Q1 > Q min Q2≤Q max When the corresponding adjustment method is: increase the exhaust speed of the range hood (2) and keep the high-speed jet fan (5) at the lowest speed; In step (4), when it is determined that there is only a small amount of oil smoke escaping: at this time, the amount of oil smoke Q1 detected by the air vent smoke sensor (10) is not greater than the amount of oil smoke Q that the range hood (2) can extract at its lowest setting. min The amount of oily smoke Q2 detected by the external smoke sensor (11) is not greater than the amount of oily smoke Q that the range hood (2) can extract at its highest setting. max That is, Q1≤Q min Q2≤Q max When the high-speed jet fan (5) is turned off, the range hood (2) is used to exhaust the fumes. In step (4), when it is determined that there is a large amount of oily smoke escaping: at this time, the amount of oily smoke Q1 detected by the air vent smoke sensor (10) is greater than the amount of oily smoke Q that the range hood (2) can extract at its lowest setting. min The amount of oil smoke Q2 detected by the external smoke sensor (11) is greater than the amount of oil smoke Q that the range hood (2) can extract at its highest setting. max That is, Q1 > Q min Q2 > Q max When the corresponding adjustment method is: increase the exhaust speed of the range hood (2), increase the rotation speed of the high-speed jet fan (5), and induce the escaped oil fumes to be drawn into the exhaust range of the range hood (2) in advance; The Q min =10-14m 3 / min, the Q max =18-22 m 3 / min.

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