Automatic speed regulating separation equipment for capturing oil fume particles and working method thereof

Abstract

The present invention belongs to the technical field of oil separation, and specifically relates to an automatic speed regulating separation device for capturing oil fume particles and a working method thereof. The automatic speed regulating separation device comprises a housing, a double-layer counter-rotating disk, and a control component. The double-layer counter-rotating disk comprises an upper blade disk and a lower blade disk. The upper blade disk and the lower blade disk respectively comprise outer ring blades, a hub, inner ring blades, and a sleeve; the outer ring blades and the inner ring blades are double-layered, and are arranged on the hub at intervals from top to bottom. The control component comprises a smoke concentration sensor, a preamplifier circuit, an A / D conversion circuit, a single-chip microcomputer, a D / A conversion circuit, and a speed controller. The smoke concentration sensor is arranged at the connection between the housing and the smoke hood, and the single-chip microcomputer is connected to the first motor and the second motor through the speed controller and the D / A conversion circuit. The present invention increases the capture efficiency of fine particles, and automatically controls the rotation speed at the same time, which is more energy-saving and environmentally friendly.

Description

Technical Field

[0001] The invention belongs to the technical field of oil separation, and in particular relates to an automatic speed regulating separation device for capturing oil fume particles and a working method thereof. Background Art

[0002] A large amount of oil smoke is produced during the frying and deep-frying process in restaurants. Oil smoke emissions have become another important source of PM2.5 pollution after industrial waste gas and automobile exhaust. Oil smoke has a complex composition, containing three phases of gas, liquid and solid. The liquid and solid phases are mainly inhalable aerosol particles, which can be suspended in the air for a long time. Contact with particles during the cooking process will also have a negative impact on health. Due to the complexity of its composition, flammability and multi-phase state, oil smoke treatment and utilization have become difficult. The oil in the oil smoke is difficult to recover, resulting in a waste of resources.

[0003] At present, the main oil fume purification technologies include mechanical separation, wet purification, electrostatic deposition, catalytic method, etc. The resource utilization of oil fume requires appropriate purification technology to collect oil fume rather than directly decompose it. Among the purification technologies, mechanical separation and electrostatic deposition focus on collecting oil fume, and the most common one is electrostatic deposition. The principle of electrostatic deposition is to use the electrons emitted by the cathode in a high-voltage electric field to capture particulate matter in the oil fume, and under the action of the electric field, the charged particles move toward the anode and are finally adsorbed by the anode. The purification efficiency of this method for particulate matter can currently reach 90%, but the deposition of particulate matter on the dust collecting electrode will lead to a decrease in capture efficiency, and the dust collecting electrode needs to be cleaned regularly. If it is not cleaned in time, it is very easy to cause a fire.

[0004] Mechanical separation methods mainly include static filters, baffle filters, cyclone separators, and rotating filters. Static filters are commonly used in the market. Grease particles collide with the filter and are collected when they rise with the airflow. For example, the Chinese invention patent with publication number CN106390629 A discloses a double-layer coaxial counter-rotating filter for oil and grease separation in a range hood. It can grade and intercept oil and fume particles of different particle sizes at a relatively low air resistance, increase the probability of physical collision between oil and fume particles and the filter, and is suitable for filtering and separating oil and grease at the air inlet of the range hood. Another example is the Chinese invention patent with publication number CN 104075358 B, which discloses a rotating grease separation filter wheel for a range hood. The chassis of the separation impeller is provided with a decorative through hole, and the center of the chassis is provided with a boss protruding toward the outer mesh plate side. The separation impeller is mounted on the rotating shaft of the mesh wheel motor through a knob, a sleeve, and a boss.

[0005] In actual work, the introduction of the rotating filter structure solves the problem that other mechanical separation methods require frequent cleaning, but the capture efficiency of oil fume particles is still not high.

[0006] Our company has applied for a Chinese invention patent with the publication number CN 117599561 A, entitled "A separation device for capturing particulate matter in oil smoke combined with cloud removal technology". It uses counter-rotating rotating blade disks and spiral fin heat exchange tubes to condense the flue gas to reach supersaturated water vapor and then precipitate water vapor, so that fine particles condense and grow, improving purification efficiency. However, in the subsequent test process, it was found that the overall structure was relatively complex, the installation and component procurement costs were high, and it was not convenient for market promotion; at the same time, the equipment power consumption was high. Summary of the invention

[0007] In view of the above-mentioned shortcomings of the prior art, the problem to be solved by the present invention is that the collection efficiency of oil fume particles by the rotary filter screen mechanical separation method is not high, and the structure of the rotary blade disk needs to be combined with the spiral fin heat exchange tube, resulting in an overly complex structure and high power consumption. The purpose of the present invention is to provide an automatic speed regulating separation device for collecting oil fume particles and a working method thereof, and to innovatively optimize the design of the rotary blade disk structure, and to have a double-layer structure, which can be independently controlled, and can be intelligently adjusted according to the oil fume situation to reduce power consumption.

[0008] In order to achieve the above-mentioned object, the present invention provides an automatic speed regulating separation device for capturing oil fume particles, comprising: a housing, a double-layer counter-rotating disk, and a control component.

[0009] The shell is cylindrical, with a smoke hood connected to the bottom and a through smoke outlet on the side.

[0010] The double-layer counter-rotating disk includes an upper blade disk and a lower blade disk. The upper blade disk and the lower blade disk have similar structures and are arranged up and down in the shell. The upper blade disk is driven by a first motor and a hollow shaft, and the lower blade disk is driven by a second motor and an inner shaft. The inner shaft is coaxially arranged in the hollow shaft.

[0011] The upper blade disc and the lower blade disc respectively include outer blades, a hub, inner blades and a sleeve; the outer blades and the inner blades are double-layered and arranged on the hub at intervals from top to bottom; the sleeve is connected to the inner blades and the sleeve is connected to a hollow shaft or an inner shaft.

[0012] The control component includes a smoke concentration sensor, a preamplifier circuit, an A / D conversion circuit, a single-chip microcomputer, a D / A conversion circuit, and a speed controller. The smoke concentration sensor is arranged at the connection between the shell and the smoke hood. The smoke concentration sensor is connected to the single-chip microcomputer through the preamplifier circuit and the A / D conversion circuit. The first motor and the second motor are variable speed motors. The single-chip microcomputer is connected to the first motor and the second motor through the speed controller and the D / A conversion circuit.

[0013] According to another embodiment of the present invention or any of the aforementioned embodiments of the automatic speed regulating separation equipment, the number of inner ring blades of the upper blade disk and the lower blade disk is 36, with an inclination angle of 28°; the number of outer ring blades is 76, with an inclination angle of 14°, and the diameter of the middle hub is 102 mm.

[0014] According to another embodiment of the present invention or any of the aforementioned embodiments of the automatic speed regulating separation device, an oil collecting tank is provided at the lower part of the shell, a support frame is provided at the upper part of the shell, the first motor is mounted on the support frame, the hollow shaft cooperates with the bearing in the support frame, there are two bearings, which are arranged up and down; the first motor is connected to the inner shaft through a coupling; the output shaft of the second motor is connected to the hollow shaft through a transmission belt.

[0015] According to another embodiment of the present invention or any of the aforementioned embodiments of the automatic speed regulation separation device, wherein the control component includes an equipment operation panel, and the buttons arranged on the equipment operation panel include a power button, an automatic speed regulation button, a manual speed regulation button, an upper blade disk knob, and a lower blade disk knob. Indicator lights are arranged above the power button, the automatic speed regulation button, and the manual speed regulation button or on the power button, the automatic speed regulation button, and the manual speed regulation button. The automatic speed regulation button and the manual speed regulation button switch the speed regulation mode, and the upper blade disk knob and the lower blade disk knob control the independent start and stop and speed adjustment of the upper blade disk and the lower blade disk.

[0016] Accordingly, a working method of an automatic speed regulating separation device for capturing oil fume particles is provided, comprising the following steps:

[0017] In the first step, after the automatic speed regulating separation equipment is started, the negative pressure causes the oil fume to enter the shell through the fume hood.

[0018] In the second step, the oil smoke passes through the lower blade disc, and the particles are captured by the lower blade disc and thrown to the inner wall of the shell under the action of centrifugal force;

[0019] In the third step, the oil smoke continues to flow upward and approaches the upper blade disk. The airflow direction changes sharply, increasing the relative speed between the particles and the blades, thereby increasing the probability of particles colliding with the blade surface. When the particles pass through the upper blade disk, they undergo the capture process again.

[0020] In the fourth step, the purified oil fume flows upward and is discharged from the side fume outlet. The particles captured by the upper and lower blade discs and thrown to the inner wall are collected by the oil collecting tank and then discharged.

[0021] The upper blade disc and the lower blade disc rotate in opposite directions, and the control methods of the upper blade disc and the lower blade disc include a manual speed regulation mode and an automatic speed regulation mode.

[0022] The upper blade disc and the lower blade disc are controlled by the upper blade disc knob and the lower blade disc knob respectively.

[0023] The automatic mode control method is as follows:

[0024] In the first step, the single chip microcomputer presets the oil smoke concentration limit T, and the smoke concentration sensor collects the oil smoke concentration signal. The smoke concentration sensor converts the received signal into a weak voltage signal through a converter; the preamplifier circuit converts the above voltage signal into a DC voltage signal; the A / D conversion circuit converts the DC signal into a digital signal, and transmits the digital signal to the single chip microcomputer to obtain the oil smoke concentration C;

[0025] In the second step, the single-chip microcomputer processes the data in real time, compares the real-time flue gas concentration with the preset concentration limit, and adjusts the rotation speed of the blade disk according to the difference; the D / A conversion circuit outputs the controlled quantity as an electrical signal and transmits the electrical signal to the speed controller; the speed controller controls the motor speed, adjusts the speed of the blade disk, and realizes the control of the speed of the counter-rotating separation equipment according to the oil smoke concentration.

[0026] According to a working method of an automatic speed regulating separation device according to another embodiment of the present invention or any of the aforementioned embodiments, the automatic speed regulating system is selected to be turned on, and the control device of the range hood obtains oil fume data through a sensor, compares it with a preset oil fume concentration limit, and adjusts the speed of the rotating blade disk according to the difference in the numerical values. First, the speed of the lower blade disk is adjusted, and when the lower blade disk reaches the maximum value, the upper blade disk is turned on.

[0027] Beneficial effects of the present invention:

[0028] 1. The automatic speed regulating separation device for capturing oil fume particles and the working method thereof of the present invention utilize a double layer of rotating blade discs of an upper blade disc and a lower blade disc to replace an ordinary filter screen, which not only increases the capture efficiency of fine particles, but also can change the flow direction of particles and has a guiding effect. At the same time, the middle hub diameter, the inner ring inclination angle, the outer ring inclination angle, etc. are determined by a polynomial regression analysis method to obtain the optimal particle capture efficiency.

[0029] 2. The upper blade disc and the lower blade disc of the present invention are controlled separately and can be adjusted in speed separately. When the smoke exhaust volume is small, only the single-layer blade disc needs to be adjusted to save energy. At the same time, the automatic speed regulation system can intelligently adjust the speed according to the oil smoke situation. The speed regulation system can control the variable speed motor to achieve stepless speed regulation of the upper blade disc and the lower blade disc. There is no need to set the gear, which is more convenient and practical, avoiding the situation where there is little oil smoke but the speed is very high, and achieving the effect of energy saving and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a three-dimensional transparent design schematic diagram of the automatic speed regulating separation device for capturing oil fume particles according to the present invention;

[0031] Figure 2It is a cross-sectional schematic diagram of the automatic speed regulating separation device for capturing oil fume particles according to the present invention;

[0032] Figure 3 for Figure 2 Schematic cross-sectional view along the AA direction;

[0033] Figure 4 It is a three-dimensional schematic diagram of the upper blade disk and the lower blade disk of the present invention;

[0034] Figure 5 It is a front view schematic diagram of the upper blade disk of the present invention;

[0035] Figure 6 It is a top view schematic diagram of the upper blade disk of the present invention;

[0036] Figure 7 A schematic diagram of flow field traces using the double-layer rotating disk of the present invention;

[0037] Figure 8 It is a cross-sectional velocity cloud diagram of the double-layer rotating disk of the present invention;

[0038] Fig. 9 It is a schematic diagram of the influence of the inner ring inclination angle and the middle hub diameter on the response surface according to the present invention;

[0039] Fig.10 It is a schematic diagram of the influence of the outer ring inclination angle and the inner ring inclination angle on the response surface according to the present invention;

[0040] Fig.11 It is a diagram of axial velocity components when the double-layer rotating blade disk of the present invention rotates in opposite directions;

[0041] Fig.12 This is a schematic diagram showing the effect of the distance between the double-layer counter-rotating blade disks on the collection efficiency of the present invention;

[0042] Fig.13 Control flow chart for adjusting the speed;

[0043] Fig.14 Schematic diagram of the automatic speed regulation system of the present invention

[0044] Fig.15 This is the device operation panel described in the present invention.

[0045] In the figure: 1. first motor; 2. coupling; 3. support frame; 4. second motor; 5. belt; 6. hollow shaft; 7. flue gas outlet; 8. shell; 9. upper blade disk; 901. outer ring blades; 902. hub; 903. inner ring blades; 904. sleeve; 10. lower blade disk; 11. oil collecting tank; 12. smoke collecting hood; 13. flue gas concentration sensor; 14. inner shaft. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] like Figure 1-3 As shown, an automatic speed regulating separation device for capturing oil fume particles includes: a housing 8, a double-layer counter-rotating disc, and a control component. The housing 8 is cylindrical, with a smoke hood 12 connected to the bottom and a through smoke outlet 7 on the side. An oil collecting tank 11 is provided at the lower part of the housing 8, and a support frame 3 is provided at the upper part of the housing 8. The first motor 1 is mounted on the support frame 3, and the hollow shaft 6 cooperates with the bearing in the support frame 3. There are two bearings, which are arranged up and down; the first motor 1 is connected to the inner shaft 14 through a coupling 2; the output shaft of the second motor 4 is connected to the hollow shaft 6 through a transmission belt 5.

[0048] like Figure 4-6 As shown, the double-layer counter-rotating disk includes an upper blade disk 9 and a lower blade disk 10. The upper blade disk 9 and the lower blade disk 10 have similar structures and are arranged up and down in the shell 8. The upper blade disk 9 is driven by the first motor 1 and the hollow shaft 6, and the lower blade disk 10 is driven by the second motor 4 and the inner shaft 14. The inner shaft 14 is coaxially arranged in the hollow shaft 6.

[0049] The upper blade disk 9 and the lower blade disk 10 respectively include outer ring blades 901, a hub 902, inner ring blades 903, and a sleeve 904; the outer ring blades 901 and the inner ring blades 903 are double-layered, and are arranged on the hub 902 with upper and lower intervals. The sleeve 904 is connected to the inner ring blades 903 and the sleeve 904 is connected to the hollow shaft 6 or the inner shaft 14.

[0050] like Figure 13-15As shown, the control component includes a smoke concentration sensor 13, a preamplifier circuit, an A / D conversion circuit, a single-chip microcomputer, a D / A conversion circuit, and a speed controller. The smoke concentration sensor 13 is arranged at the connection between the housing 8 and the smoke hood 12. The smoke concentration sensor 13 is connected to the single-chip microcomputer through the preamplifier circuit and the A / D conversion circuit. The first motor 1 and the second motor 4 are variable speed motors. The single-chip microcomputer is connected to the first motor 1 and the second motor 4 through the speed controller and the D / A conversion circuit. The control component also includes an equipment operation panel. The buttons provided on the equipment operation panel include a power button, an automatic speed control button, a manual speed control button, an upper blade disc 9 knob, and a lower blade disc 10 knob. Indicator lights are provided above or on the power button, the automatic speed control button, and the manual speed control button. The automatic speed control button and the manual speed control button switch the speed control mode. The upper blade disc 9 knob and the lower blade disc 10 knob control the independent start and stop of the upper blade disc 9 and the lower blade disc 10, and the speed adjustment.

[0051] The structural model of the rotating blade disk is as follows Figure 4 , 5 As shown in Figure 6, according to the national standard GB / T 17713-2022, the recommended air volume is 800m3 / h, the flue cross-sectional area is about 0.06m2, the blade disk diameter is determined to be 220mm, the upper and lower layers of blades are staggered and have an inclination angle, and the rotation of the blade disk is used to guide the oil fume, increase the centrifugal force of the particles, and achieve efficient separation of the particles.

[0052] In order to improve the capture efficiency of particulate matter, a double-layer rotating blade disk device for capturing oil fume particles was designed, and the structure of the rotating blade disk in the device was optimized. The double-circle rotating blade disk structure was designed by Box-Behnken design, the structural parameters of the rotating blade disk were optimized, the regression equation was calculated and the regression equation between the experimental variables and the response values ​​was plotted, and a response surface diagram was plotted to obtain the optimized combination of rotating blade disk structural parameters. The capture efficiency of the model before and after optimization was compared to prove the optimization effect. The flow field of the oil fume in the flue where the optimized rotating blade disk was located was simulated, and the reason for the increase in the capture efficiency was analyzed based on the flow field trajectory diagram. The capture efficiency of the double-layer blade disk when rotating in the same direction and in opposite directions was calculated using the optimized rotating blade disk, and the flow field trajectory was simulated to draw the conclusion that the counter-rotating blade disk has a higher capture efficiency.

[0053] The upper blade disc 9 and the lower blade disc 10 use the polynomial regression analysis method to determine the intermediate hub diameter, inner ring inclination angle, and outer ring inclination angle. The multivariate linear regression equation obtained by fitting using the Design-Expert software is shown in the following formula:

[0054]

[0055] In the formula, y is the response value,

[0056] β0—constant term;

[0057] β i 2 — linear term coefficient;

[0058] β ij 2 —coefficient of quadratic term;

[0059] β ii 2 —square term coefficient;

[0060] i,j=1~3;

[0061] x1—middle hub diameter (mm);

[0062] x2—inner ring inclination angle (°);

[0063] x3—outer ring inclination angle (°);

[0064] ε—error term;

[0065] The response value is positively correlated with the capture efficiency and exhaust volume. The Design-Expert software was used to perform variance analysis and significance test on the regression equation. The analysis results are shown in Table 1:

[0066] Table 1 Results of variance analysis of regression equation

[0067]

[0068]

[0069] With the level of each influencing factor as the horizontal axis and the response value as the vertical axis, a response surface diagram between the factor and the response value is drawn as follows: Fig. 9 , 10 shown.

[0070] In order to clearly show the change of oil fume velocity in the shell flow field, the velocity cloud diagram of the cross-section flow field in the shell flue is intercepted, as shown in Figure 8 As shown in the figure, the velocity at the flow field entrance is stable, the rotation of the blades at the rotating blade disk makes the velocity distribution near it irregular, and the velocity at the blade tip is the largest. The velocity of the flow field downstream of the rotating blade disk generally increases first and then decreases in the radial direction.

[0071] The flow field analysis of the double-layer blade disk rotating in opposite directions is as follows Figure 7 As shown, the axial velocity component is Fig.11As shown in the figure. When the two blade disks rotate in opposite directions, the tangential velocity at the position below the upper blade disk decreases to 0 m / s due to the turning of the airflow, and then increases to 15.79 m / s at the upper blade disk. The tangential velocity of the airflow decreases and turns, and the particles decrease with the trend of the flow field, which increases the relative speed between the particles and the blades and increases the probability of particles colliding with the blade surface.

[0072] Comparing the axial velocity components of the double-layer blade disks rotating in the same direction and in opposite directions, regardless of whether the two blade disks rotate in the same direction, the velocity components of the flow field below the lower blade disk have similar trends, and the tangential velocity in the area of ​​the lower blade disk is close to 16m / s. The rotation direction of the upper blade disk has little effect on the rotation of the lower blade disk. Therefore, when the double-layer blade disk rotates in opposite directions, the relative speed between the blades and the particles increases, which can effectively improve the capture efficiency.

[0073] like Fig.12 As shown, when the distance between the double-layer counter-rotating blade disks is in the range of 50 to 100 mm, as the distance between the double-layer counter-rotating blade disks increases, the particle collection efficiency first increases and then decreases, reaching a maximum value of 84.34% at 60 mm.

[0074] The response surface optimization design was used to optimize the blade disk structure. The regression equation and the optimal process parameters were calculated as follows: the number of inner ring blades 903 of the upper blade disk 9 and the lower blade disk 10 was 36 with an inclination angle of 28°; the number of outer ring blades 901 was 76 with an inclination angle of 14°, and the diameter of the middle hub 902 was 102 mm.

[0075] Accordingly, a working method of an automatic speed regulating separation device for capturing oil fume particles is provided, comprising the following steps:

[0076] In the first step, after the automatic speed regulating separation device is started, the negative pressure causes the oil fume to enter the interior of the housing 8 through the fume collecting hood 12.

[0077] In the second step, the oil fume passes through the lower blade disc 10, and the particles are captured by the lower blade disc 10 and thrown toward the inner wall of the housing 8 by the centrifugal force;

[0078] In the third step, the oil fume continues to flow upward and approaches the upper blade disk 9, where the airflow direction changes sharply, increasing the relative speed between the particles and the blades, thereby increasing the probability of the particles colliding with the blade surface. The particles undergo a capture process again when passing through the upper blade disk 9.

[0079] In the fourth step, the finally purified oil fume flows upward and is discharged from the side fume outlet 7. The particles captured by the upper blade disc 9 and the lower blade disc 10 and thrown to the inner wall are collected by the oil collecting tank 11 and then discharged.

[0080] The upper blade disc 9 and the lower blade disc 10 rotate in opposite directions, and the control method of the upper blade disc 9 and the lower blade disc 10 includes a manual speed regulation mode and an automatic speed regulation mode.

[0081] The upper blade disc 9 and the lower blade disc 10 are controlled by the upper blade disc 9 knob and the lower blade disc 10 knob respectively.

[0082] The automatic mode control method is as follows:

[0083] In the first step, the single chip microcomputer presets the oil smoke concentration limit T, and the smoke concentration sensor 13 collects the oil smoke concentration signal. The smoke concentration sensor 13 converts the received signal into a weak voltage signal through a converter; the preamplifier circuit converts the above voltage signal into a DC voltage signal; the A / D conversion circuit converts the DC signal into a digital signal, and transmits the digital signal to the single chip microcomputer to obtain the oil smoke concentration C;

[0084] In the second step, the single-chip microcomputer processes the data in real time, compares the real-time flue gas concentration with the preset concentration limit, and adjusts the rotation speed of the blade disk according to the difference; the D / A conversion circuit outputs the controlled quantity as an electrical signal and transmits the electrical signal to the speed controller; the speed controller controls the motor speed, adjusts the speed of the blade disk, and realizes the control of the speed of the counter-rotating separation equipment according to the oil smoke concentration.

[0085] According to a working method of an automatic speed regulating separation device according to another embodiment of the present invention or any of the aforementioned embodiments, the automatic speed regulating system is selected to be turned on, and the control device of the range hood obtains oil fume data through a sensor, compares it with a preset oil fume concentration limit, and adjusts the speed of the rotating blade disk according to the difference in the numerical values. First, the speed of the lower blade disk 10 is adjusted, and when the lower blade disk 10 reaches the maximum value, the upper blade disk 9 is turned on.

[0086] Working principle of the present invention:

[0087] The structure of the present invention mainly includes a housing 8, a first motor 1, a second motor 4, an inner shaft 14, an outer shaft, an upper blade disc 9 and a lower blade disc 10. The lower blade disc 10 is mounted on the inner shaft 14, and the inner shaft 14 and the first motor 1 are connected by a coupling 2, and are installed at the center of the housing 8. The upper blade disc 9 is mounted on the outer shaft, and the outer shaft is sleeved on the inner shaft 14, and the transmission of the second motor 4 is realized by a belt drive.

[0088] The upper blade disc 9 and the lower blade disc 10 are both double-circle and double-layer blade discs, and both inner and outer circles have multiple inclined thin blades arranged alternately up and down; the difference is that the number of blades 901 in the inner and outer circles is different, and a distance of more than millimeters is maintained between each blade, which facilitates manufacturing while ensuring smooth flow of oil smoke.

[0089] The difference between the upper blade disk 9 and the lower blade disk 10 is that, since the two blade disks rotate in opposite directions, the blade inclination angles of the two blade disks are different, thereby ensuring that the windward surfaces of the rotary separation device are the same.

[0090] The housing 8 includes an oil collecting tank 11, a smoke collecting hood 12, a smoke outlet 7, a smoke concentration sensor 13, a speed sensor and a motor support frame 3. The smoke collecting hood 12 is used to collect the oil smoke from the stove below and allow the oil smoke to enter the rotating separation device above. The oil collecting tank 11 is set below the lower blade disk 10 and can collect the oil smoke particles thrown along the blades to the inner wall of the housing 8. In order to adapt to the general use environment, the smoke outlet 7 is set at the side of the housing 8 to facilitate the discharge of the purified smoke.

[0091] The speed of the blade disc is determined according to the detected oil fume concentration to achieve automatic speed regulation. For kitchen oil fume conditions, the oil fume concentration is used as the detection object, and intelligent speed regulation can be performed according to the oil fume conditions to avoid the situation where there is little oil fume but the speed is very high, thus achieving energy-saving and environmental protection effects.

[0092] The counter-rotation in the counter-rotation separation device is achieved by:

[0093] The lower blade disc 10 is mounted on the inner shaft 145, and the coupling 2 is used to connect the first motor 1 shaft and the inner shaft 14, thereby driving the lower blade disc 10 to rotate. The outer shaft sleeve is arranged outside the inner shaft 145, and the upper blade disc 9 is mounted on the outer shaft, and the transmission belt 5 is used to connect the second motor 4 and the outer shaft, thereby driving the upper blade disc 9 to rotate.

[0094] When the equipment is in use, the oil smoke enters the equipment through the smoke hood 12. When the smoke passes through the lower blade disk 10, the particles are captured by the blade disk and thrown toward the inner wall of the housing 8 by the centrifugal force. The oil smoke continues to flow upward. When it approaches the upper blade disk 9, the airflow direction changes sharply, increasing the relative speed between the particles and the blades, thereby increasing the probability of the particles colliding with the blade surface. When the particles pass through the upper blade disk 9, they undergo the capture process again. Finally, the purified oil smoke flows upward and is discharged from the side smoke outlet 7. The particles captured by the blade disk and thrown toward the inner wall are collected by the oil collecting tank 11 and then discharged.

[0095] The device is provided with an operation panel and a power switch button for turning the power of the device on and off; an automatic speed control button and a manual speed control button are provided, and the user can select according to the needs, and the manual speed control system and the automatic speed control system cannot be selected at the same time. Selecting the automatic speed control button turns on the automatic speed control system, and selecting the manual speed control button can control the upper blade disc 9 and the lower blade disc 10 respectively through the two knobs on the right.

[0096] The automatic speed regulation system comprises a smoke concentration sensor 13, a preamplifier circuit, an A / D conversion circuit, a single chip microcomputer, a D / A conversion circuit and a speed regulation controller.

[0097] The specific speed regulation steps and implementation methods of the automatic speed regulation system are as follows:

[0098] The single chip microcomputer presets the oil smoke concentration limit value T;

[0099] The smoke concentration sensor 13 converts the received signal into a weak voltage signal through a converter.

[0100] The preamplifier circuit converts the voltage signal into a DC voltage signal.

[0101] The A / D conversion circuit converts the DC signal into a digital signal, transmits the digital signal to the single-chip microcomputer, and obtains the oil fume concentration C.

[0102] The microcontroller processes the data in real time, compares the real-time flue gas concentration with the preset concentration limit, and adjusts the rotation speed of the blade disk according to the difference.

[0103] The D / A conversion circuit outputs the controlled quantity as an electrical signal and transmits the electrical signal to the speed controller.

[0104] The speed controller controls the motor speed and adjusts the speed of the blade disc to control the speed of the counter-rotating separation equipment according to the oil smoke concentration.

[0105] The flue gas concentration sensor 13 converts the received signal into a weak voltage signal through a converter, and then converts it into a DC voltage signal through an amplifier. The DC signal is then converted into a digital signal through a filter and a converter, and finally the digital signal is transmitted to the single-chip microcomputer. The single-chip microcomputer processes the data in real time, compares the real-time flue gas concentration with the preset concentration limit, adjusts the rotation speed of the blade disk according to the difference, outputs the controlled quantity as an electrical signal, and transmits the electrical signal back to the frequency converter. The motor speed is controlled by the frequency converter, and the speed of the blade disk is adjusted to realize the control of the speed of the counter-rotating separation equipment according to the smoke concentration.

[0106] When the range hood is actually used, the rotation speed of the counter-rotating device can be determined according to the current oil fume concentration to achieve fully automatic intelligent speed regulation; for kitchen oil fume conditions, the oil fume concentration is used as the detection object, and its detection technology is now very mature.

[0107] In the operation panel, a power switch button is set to turn the power of the device on and off; an automatic speed control button and a manual speed control button are set, and users can choose according to their needs. The manual speed control system and the automatic speed control system cannot be selected at the same time.

[0108] If you choose to turn on manual speed regulation, you can control the upper blade disc 9 and the lower blade disc 10 respectively through the two knobs on the right.

[0109] When the automatic speed control system is turned on, the control device of the range hood obtains the oil fume data through the sensor, compares it with the preset oil fume concentration limit, and adjusts the speed of the rotating blade disc according to the difference in the value. First, the speed of the lower blade disc 10 is adjusted. When the lower blade disc 10 reaches the maximum value, the upper blade disc 9 is turned on, which can save power resources. The automatic speed control system enables the device to intelligently adjust the speed according to the kitchen oil fume environment.

[0110] In response to the kitchen fume situation, the key factor of fume detection, namely fume concentration, is used as the detection object. The detection technology solution has low cost and high accuracy, and can avoid the high cost and complex control methods caused by sensor redundancy, taking into account both cost and implementation effect. There are no requirements for the stoves used, and no matching stoves are required to capture fume particles, which has a wider range of applications.

[0111] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above implementation is only to illustrate the technical concept and features of the present invention, and its purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and it cannot be used to limit the protection scope of the present invention. All 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. An automatic speed regulating separation device for capturing oil fume particles, characterized in that: include: Shell (8), double-layer counter-rotating disc, control assembly, The housing (8) is cylindrical, with a smoke collecting hood (12) connected to the bottom and a through smoke outlet (7) provided on the side. The double-layer counter-rotating disk comprises an upper blade disk (9) and a lower blade disk (10), wherein the upper blade disk (9) and the lower blade disk (10) have similar structures and are arranged up and down in a housing (8), wherein the upper blade disk (9) is driven by a first motor (1) and a hollow shaft (6), and the lower blade disk (10) is driven by a second motor (4) and an inner shaft (14), and the inner shaft (14) is coaxially arranged in the hollow shaft (6). The upper blade disc (9) and the lower blade disc (10) respectively comprise outer ring blades (901), a wheel hub (902), inner ring blades (903), and a sleeve (904); the outer ring blades (901) and the inner ring blades (903) are double-layered and arranged on the wheel hub (902) with an upper and lower interval; the sleeve (904) is connected to the inner ring blades (903) and the sleeve (904) is connected to the hollow shaft (6) or the inner shaft (14); The control component comprises a smoke concentration sensor (13), a preamplifier circuit, an A / D conversion circuit, a single-chip microcomputer, a D / A conversion circuit, and a speed control controller; the smoke concentration sensor (13) is arranged at the connection between the housing (8) and the smoke hood (12); the smoke concentration sensor (13) is connected to the single-chip microcomputer via the preamplifier circuit and the A / D conversion circuit; the first motor (1) and the second motor (4) are variable speed motors; and the single-chip microcomputer is connected to the first motor (1) and the second motor (4) via the speed control controller and the D / A conversion circuit; The upper blade disk (9) and the lower blade disk (10) are determined by the polynomial regression analysis method, and the intermediate hub diameter, the inner ring inclination angle, and the outer ring inclination angle are determined. The multivariate linear regression equation obtained by fitting using the Design-Expert software is shown in the following formula: In the formula, y is the response value, β0—constant term; β i 2 — linear term coefficient; β ij 2 —coefficient of quadratic term; β ii 2 —square term coefficient; i, j =1~3； x 1 —Intermediate hub diameter (mm); x 2 —Inner ring inclination angle (°); x 3 — Outer ring inclination angle (°); ε — error term; The response value is positively correlated with the capture efficiency and exhaust volume.

2. The automatic speed regulating separation device for capturing oil fume particles according to claim 1 is characterized in that: The number of inner ring blades (903) of the upper blade disc (9) and the lower blade disc (10) is 36, with an inclination angle of 28°; the number of outer ring blades (901) is 76, with an inclination angle of 14°; and the diameter of the middle hub (902) is 102 mm.

3. The automatic speed regulating separation device for capturing oil fume particles according to claim 1 is characterized in that: An oil collecting tank (11) is provided at the lower part of the housing (8), a support frame (3) is provided at the upper part of the housing (8), the first motor (1) is mounted on the support frame (3), the hollow shaft (6) cooperates with a bearing in the support frame (3), and the bearings are two and arranged up and down; the first motor (1) is connected to the inner shaft (14) via a coupling (2); and the output shaft of the second motor (4) is connected to the hollow shaft (6) via a transmission belt (5).

4. The automatic speed regulating separation device for capturing oil fume particles according to claim 1 is characterized in that: The control component further comprises an equipment operation panel, wherein buttons provided on the equipment operation panel comprise a power button, an automatic speed adjustment button, a manual speed adjustment button, an upper blade disk (9) knob, and a lower blade disk (10) knob. Indicator lights are provided above or on the power button, the automatic speed adjustment button, and the manual speed adjustment button. The automatic speed adjustment button and the manual speed adjustment button switch speed adjustment modes. The upper blade disk (9) knob and the lower blade disk (10) knob control the independent start and stop and speed adjustment of the upper blade disk (9) and the lower blade disk (10).

5. The working method of the automatic speed regulating separation device for capturing oil fume particles according to claim 4 is characterized in that: The following steps are involved: In the first step, after the automatic speed regulating separation device is started, the negative pressure causes the oil fume to enter the interior of the housing (8) through the fume collecting hood (12). In the second step, the oil smoke passes through the lower blade disk (10), and the particles are captured by the lower blade disk (10) and thrown toward the inner wall of the housing (8) under the action of centrifugal force; In the third step, the oil smoke continues to flow upward and approaches the upper blade disk (9), where the airflow direction changes sharply, increasing the relative speed between the particles and the blades, thereby increasing the probability of the particles colliding with the blade surface. When the particles pass through the upper blade disk (9), they undergo a capture process again. In the fourth step, the finally purified oil fume flows upward and is discharged from the side fume outlet (7). The particles captured by the upper blade disc (9) and the lower blade disc (10) and thrown toward the inner wall are collected by the oil collecting tank (11) and then discharged. The upper blade disc (9) and the lower blade disc (10) rotate in opposite directions, and the control method of the upper blade disc (9) and the lower blade disc (10) includes a manual speed regulation mode and an automatic speed regulation mode. The upper blade disc (9) and the lower blade disc (10) are controlled respectively by means of a knob of the upper blade disc (9) and a knob of the lower blade disc (10). The automatic mode control method is as follows: In the first step, the single chip microcomputer presets the oil smoke concentration limit value T, the smoke concentration sensor (13) collects the oil smoke concentration signal, and the smoke concentration sensor (13) converts the received signal into a weak voltage signal through a converter; the preamplifier circuit converts the voltage signal into a direct current voltage signal; the A / D conversion circuit converts the direct current signal into a digital signal, and transmits the digital signal to the single chip microcomputer to obtain the oil smoke concentration C; In the second step, the single-chip microcomputer processes the data in real time, compares the real-time flue gas concentration with the preset concentration limit, and adjusts the rotation speed of the blade disk according to the difference; the D / A conversion circuit outputs the controlled quantity as an electrical signal and transmits the electrical signal to the speed controller; the speed controller controls the motor speed, adjusts the speed of the blade disk, and realizes the control of the speed of the counter-rotating separation equipment according to the oil smoke concentration.

6. The working method of the automatic speed regulating separation device for capturing oil fume particles according to claim 5 is characterized in that: The automatic speed regulation system is selected to be turned on, and the control device of the range hood obtains oil fume data through a sensor, compares it with a preset oil fume concentration limit, and adjusts the speed of the rotating blade disc according to the difference in the values, first adjusting the speed of the lower blade disc (10), and when the lower blade disc (10) reaches the maximum value, the upper blade disc (9) is turned on.

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