A range hood with negative ion component

Abstract

The invention discloses a range hood with a negative ion component, wherein the negative ion component comprises a negative ion emission head and a driving mechanism, wherein the negative ion emission head is connected to the driving mechanism; the negative ion emission head has at least two working modes, wherein in a first working mode, the negative ion emission head generates negative ions at a first duty cycle, and an air curtain fan runs at a first rotational speed, and the negative ion emission head runs in a first area of ​​an air curtain duct; the invention also comprises a user detection module, wherein the user detection module is arranged on a housing of the range hood and faces a direction where a user is located; when the user detection module detects that a user is approaching, the negative ion component enters a second working mode, the negative ion emission head generates negative ions at a second duty cycle, the air curtain fan runs at a second rotational speed, and the negative ion emission head runs in a second area of ​​an air curtain duct; the invention can flexibly adjust the amount of negative ions generated by the negative ion emission head and the use effect, fully utilizes the negative ion function, and effectively ensures safe use.

Description

Technical Field

[0001] The invention relates to the technical field of range hoods, and in particular to a range hood with a negative ion component. Background Art

[0002] Traditional range hoods only have the function of absorbing and exhausting oil fumes. Now some high-end range hoods have the function of negative ion emission, which can purify the kitchen air by emitting negative ions, eliminate dust and smoke in the kitchen air, and inhibit and kill bacteria and viruses in the kitchen.

[0003] In the prior art, the utility model patent with application number CN201620126829.0 discloses a range hood with a negative ion emission function, and the utility model patent with application number CN202322616907.8 discloses a negative ion range hood. Both range hoods with negative ion functions have a negative ion generator and a fan or blower. The negative ion generator is used to generate negative ions, and the fan or blower is used to blow the negative ions into the kitchen air to purify the air in the kitchen. However, the negative ion generators of these two range hoods are fixedly set, and the control method is single, which cannot fully utilize the function of the negative ion generator, and needs further improvement. Summary of the invention

[0004] The object of the present invention is to provide a range hood with a negative ion component, aiming to improve the problem that the negative ion generator of the existing range hood is fixedly arranged and has a single control method, resulting in that the function of the negative ion generator cannot be fully utilized.

[0005] The present invention is implemented as follows: a range hood with a negative ion component comprises a smoke collecting chamber, wherein an air suction port is arranged in the smoke collecting chamber;

[0006] The negative ion assembly comprises a negative ion emission head and a driving mechanism, wherein the negative ion emission head is arranged in the wind curtain duct, and an adjustable speed wind curtain fan is arranged upstream of the wind curtain duct; the negative ion emission head is connected to the driving mechanism, and the driving mechanism drives the negative ion emission head to move;

[0007] The negative ion component has at least two working modes. In the first working mode, the negative ion emission head generates negative ions at a first duty cycle, and the wind curtain fan runs at a first speed, and the negative ion emission head runs in the first area of ​​the wind curtain air duct;

[0008] It also includes a user detection module, which is arranged on the housing of the range hood and faces the direction where the user is;

[0009] When the user detection module detects that a user is approaching, the negative ion component enters a second working mode, the negative ion emission head generates negative ions at a second duty cycle, the wind curtain fan operates at a second speed, and the negative ion emission head operates in a second area of ​​the wind curtain duct;

[0010] The second duty cycle is smaller than the first duty cycle, and the second area is closer to the air curtain fan than the first area.

[0011] Furthermore, the first rotational speed is 70%-100% of the maximum rotational speed of the air curtain fan, the user detection module is an infrared thermopile detection module or a radar detection module; the first duty cycle is 0.7-0.95, and the second duty cycle is 0.1-0.23.

[0012] Furthermore, the driving mechanism of the negative ion component includes a mounting bracket and a guide rail, the mounting bracket is arranged on the housing of the range hood, and the guide rail is arranged on the mounting bracket or the housing of the range hood; a motor is installed on the mounting bracket, and a gear is installed on the rotating shaft of the motor; a track groove extending along the upstream and downstream directions of the air curtain duct is provided on the guide rail, a rack is slidably installed in the track groove, and the negative ion emission head is connected to the rack.

[0013] Furthermore, a cyclone base and a fixed bracket are provided on the shell of the range hood below the wind curtain fan, the fixed bracket is connected to the shell of the range hood, the cyclone base is fixedly mounted on the fixed bracket, and the wind curtain fan is mounted on the cyclone base; a wind curtain air outlet is provided on the cyclone base; the negative ion emitter head has a cross bar portion, and the cyclone base has a wind curtain air cavity connecting the wind curtain air outlet and the wind curtain fan exhaust port, and an opening structure is provided on one side of the cyclone base for the cross bar portion of the negative ion emitter head to pass through and connected to the wind curtain air cavity.

[0014] Further, a PM2.5 detection chamber is provided on the shell of the range hood, a PM2.5 detection chamber is provided in the PM2.5 detection chamber, the shell includes a top plate, a first air vent connected to the PM2.5 detection chamber and a second air vent connected to the air intake port of the air curtain fan are provided on the top plate; the PM2.5 detection module is electrically connected to a main control module of the range hood, the main control module is electrically connected to a smoke exhaust fan of the range hood, and the drive motor of the smoke exhaust fan is an adjustable speed motor; a first oil fume concentration threshold C1, a second oil fume concentration threshold C2, a third oil fume concentration threshold C3 and a fourth oil fume concentration threshold C4 are provided in the main control module, and C1<C2<C3<C4;

[0015] The housing of the range hood is also provided with a control panel, and a marquee is provided inside the housing, the marquee is electrically connected to the main control module, the marquee is provided along the periphery of the control panel, and the marquee can be seen through the control panel;

[0016] In the second working mode: the PM2.5 detection module detects the oil fume concentration C in the air in the kitchen and transmits the detection result to the main control module of the range hood. The main control module compares the received oil fume concentration C with the set oil fume concentration threshold and performs the following operations:

[0017] When C<C1, the air curtain fan runs at the initial second speed, the negative ion emitter generates negative ions at the initial second duty cycle, the smoke exhaust fan of the range hood runs at the initial cruising gear, and the marquee is off;

[0018] When C1≤C<C2, the air curtain fan increases its speed, the negative ion emitter increases its duty cycle, the smoke exhaust fan of the range hood increases its gear, and the marquee flashes and runs;

[0019] When C2≤C<C3, the air curtain fan increases its speed again, the negative ion emitter increases its duty cycle again, the smoke exhaust fan of the range hood increases its gear again, and the marquee runs;

[0020] When C3≤C<C4, exit the second working mode and enter the third working mode. In the third working mode: the air curtain fan runs at the highest speed, the driving mechanism of the negative ion component drives the negative ion emission head away from the air curtain fan, but the negative ion emission head is not exposed, the negative ion emission head further increases the duty cycle to the third duty cycle, the smoke exhaust fan of the range hood increases one gear again, and the gear is not the highest gear of the smoke exhaust fan, and the marquee runs;

[0021] When C4≤C, exit the third working mode and enter the fourth working mode. In the fourth working mode: the negative ion emitter runs at the highest duty cycle for N seconds, and then reduces to the third duty cycle. The air curtain fan runs at 70%-90% of the maximum speed. The smoke exhaust fan of the range hood runs at the highest gear for M seconds, and then reduces one gear. 30≤N≤90, 20≤M≤60; the marquee runs in a running mode.

[0022] Further, the control circuit of the negative ion component includes one or more of a high-frequency ripple suppression circuit, a surge pulse suppression circuit, a time control circuit, an electric shock protection circuit, and a power supply reverse connection protection circuit; the high-frequency ripple suppression circuit is used to reduce the high-frequency ripple generated when the negative ion emitter starts, so as to prevent the pulsation of the current when the negative ion emitter starts from affecting the front-end circuit; the surge pulse suppression circuit is used to absorb the surge power to avoid generating a surge pulse impact on the subsequent circuit; the time control circuit is used to control the startup duration of the negative ion emitter, and the electric shock protection circuit is used to cut off the power supply of the negative ion emitter to prevent electric shock to the human body; the power supply reverse connection protection circuit is used to not power on when the power supply input of the negative ion emitter is connected reversely.

[0023] Further, the high-frequency ripple suppression circuit includes an inductor L, a capacitor C1, and a capacitor C2. The capacitor C1 and the capacitor C2 are connected in parallel with each other, and the inductor L is connected in series between the capacitor C1 and the capacitor C2; the surge pulse suppression circuit includes a transient voltage suppression diode TVS1 connected in parallel with the capacitor C1.

[0024] Further, the time control circuit includes a resistor R1, a resistor R2, a triode Q1, and a capacitor C5. The triode Q1 is electrically connected to the main control module of the range hood.

[0025] Further, the power supply reverse connection protection circuit includes a P-MOS transistor Q3, a resistor R13, a capacitor C11, a zener diode D1, and a resistor R14. The resistor R13 is connected in parallel between the G pole and the S pole of the P-MOS transistor Q3, and when the power supply is powered on, it provides a VGS conduction voltage to the P-MOS transistor Q3 to make the P-MOS transistor Q3 saturated and conducting, and the negative ion emitter has a 12V voltage input; the capacitor C11 is connected in parallel between the G pole and the S pole of the P-MOS transistor Q3 for a soft start function; the zener diode D1 is connected in parallel with the capacitor C11 and the resistor R13 to prevent the 12V voltage from being too high and breaking down the P-MOS transistor Q3.

[0026] Further, the electric shock protection circuit includes a comparison circuit and a sampling resistor R6. The comparison circuit includes a chip U5, a resistor R4, a resistor R5, and a resistor R7; by detecting the working current I1 of the negative ion emitter and the resistance value r of the sampling resistor R6, the sampling voltage U0 = I1 * r is calculated; the voltage across the resistor R4 and the resistor R5 is the reference voltage Ui. When U0 > Ui, the chip U5 outputs a high level, and the power supply control circuit cuts off the power supply of the negative ion emitter. When U0 < Ui, the chip U5 outputs a low level, and the power supply control circuit conducts the power supply of the negative ion emitter, and the negative ion emitter works normally;

[0027] The electric shock protection circuit also includes a power control circuit, which includes a capacitor C10, a resistor R10, a resistor R11, a transistor Q2 and a resistor R12. The signal output end of the chip U5 is connected in parallel with the capacitor C10 to suppress signal ripples, and the resistor R10 is connected in series to the control pin of the transistor Q2. The control pin of the transistor Q2 is connected in parallel with the pull-down resistor R11. When the chip U5 outputs a high level, the transistor Q2 is turned on and grounded, so that the electrical signal of the control pin of the P-MOS tube Q3 is pulled low, and the P-MOS tube Q3 is turned off and the 12V input is disconnected to stop supplying power to the negative ion emission head; when the chip U5 outputs a low level, the transistor Q2 is not turned on, the VGS on-voltage of the control pin of the P-MOS tube Q3 is kept at a high level, and the 12V input is used to power the negative ion emission head.

[0028] Compared with the prior art, the range hood provided by the present invention has a negative ion component and a user detection module, the user detection module is used to detect whether the user is close to the range hood, and the negative ion component includes a negative ion emission head and a driving mechanism. The present invention can flexibly drive the negative ion emission head to move along the upstream and downstream directions of the air curtain duct through the driving mechanism according to the detection result of the user detection module, flexibly adjust the amount of negative ions generated by the negative ion emission head and the use effect, make full use of the negative ion function, and effectively ensure the safety of use. Other advantages of the present invention are described in the subsequent description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention when the top plate of the shell is removed;

[0031] Figure 3 It is a front view of the present invention;

[0032] Figure 4 yes Figure 3 AA section view;

[0033] Figure 5 The negative ion component of the present invention is in the second working mode. Figure 4 Enlarged view of the middle C area;

[0034] Figure 6 The negative ion component of the present invention is in the first working mode, Figure 4 Enlarged view of the middle C area;

[0035] Figure 7 yes Figure 3 BB section view;

[0036] Figure 8 This is an enlarged view of area D in 7;

[0037] Fig. 9 It is a schematic diagram of the three-dimensional structure when the air curtain assembly and the negative ion assembly of the present invention are connected;

[0038] Fig.10 It is a three-dimensional structural schematic diagram of the negative ion component of the present invention;

[0039] Fig.11 is a schematic diagram of the three-dimensional structure of the air curtain assembly of the present invention;

[0040] Fig.12 It is the electric control structure block diagram of the present invention;

[0041] Fig.13 It is a negative ion operation control circuit diagram of the present invention.

[0042] In the figure: 1. Mounting bracket; 2. Guide rail; 3. Motor; 4. Gear; 5. Rack; 6. Negative ion emitter; 7. User detection module; 8. Wind curtain fan; 9. Shell; 10. Cyclone base; 11. Fixed bracket; 12. Opening structure; 13. PM2.5 detection chamber; 14. First air vent; 15. Second air vent; 16. Control panel; 17. Left baffle; 18. Right baffle; 19. Top plate. DETAILED DESCRIPTION

[0043] In the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0045] like Figure 1 , Figure 2 , Figure 9-11As shown, a range hood with a negative ion component includes a smoke collecting chamber, a housing 9, a left baffle 17, a right baffle 18, a negative ion component and an air curtain component. The smoke collecting chamber is an area surrounded by the housing 9, the left baffle 17 and the right baffle 18. An air suction port is provided in the smoke collecting chamber, which is also the air suction port of the range hood and is connected to the smoke exhaust duct in the housing 9 of the range hood. A smoke exhaust fan is provided in the smoke exhaust duct. The speed of the smoke exhaust fan is adjustable. When the smoke exhaust fan is started, negative pressure is generated at the air suction port, and air in the smoke collecting chamber is sucked in for smoke exhaust.

[0046] like Fig.11 As shown, the wind curtain assembly includes a wind curtain fan 8, a cyclone base 10 and a fixed bracket 11. The speed of the wind curtain fan 8 is adjustable. The cyclone base 10 and the fixed bracket 11 are located below the wind curtain fan 8. The fixed bracket 11 is connected to the housing 9 of the range hood. The cyclone base 10 is fixedly mounted on the fixed bracket 11, and the wind curtain fan 8 is mounted on the cyclone base 10. A wind curtain air outlet is provided on the cyclone base 10, and the exhaust air of the wind curtain fan 8 is discharged from the wind curtain air outlet to form a wind curtain wind with a downward component. The cyclone base 10 has a wind curtain air cavity connecting the wind curtain air outlet and the exhaust outlet of the wind curtain fan 8. The wind curtain air duct is between the wind curtain air outlet and the exhaust outlet of the wind curtain fan 8, and the wind curtain air cavity is a part of the wind curtain air duct. The wind curtain fan 8 is located upstream of the wind curtain air duct, and the wind curtain air outlet is located downstream of the wind curtain air duct. As shown Figure 5 As shown, the negative ion component includes a negative ion emitter head 6, which is arranged in the air duct of the wind curtain. When the wind curtain fan 8 rotates, air blown downward is generated. When the speed of the wind curtain fan 8 is high, the negative ions emitted by the negative ion emitter head 6 are taken away from the negative ion emitter head 6 and mixed into the kitchen air, which can effectively improve technical effects such as odor elimination and PM2.5 elimination.

[0047] like Figure 2 , Figure 9-11 As shown, the negative ion assembly also includes a driving mechanism for driving the negative ion emitter 6, and the driving mechanism includes a mounting bracket 1 and a guide rail 2. The mounting bracket 1 is arranged on the housing 9 of the range hood, and the guide rail 2 is arranged on the mounting bracket 1 or the housing 9 of the range hood. A motor 3 is installed on the mounting bracket 1, and a gear 4 is installed on the rotating shaft of the motor 3, and the gear 4 is limited by a retaining spring. A track groove extending along the upstream and downstream directions of the wind curtain air duct is arranged on the guide rail 2, and a rack 5 is slidably installed in the track groove. The negative ion emitter 6 has a crossbar portion, and the negative ion emitter 6 is connected to the rack 5 through its crossbar portion. An opening structure 12 for the crossbar portion of the negative ion emitter 6 to pass through and communicate with the wind curtain air cavity is provided on one side of the cyclone base 10. Start the motor 3, the motor 3 drives the gear 4 to rotate, the gear 4 and the rack 5 are meshed, and when the gear 4 rotates, it drives the rack 5 and the negative ion emitter 6 to move along the upstream and downstream directions of the wind curtain air duct, thereby moving away from or approaching the wind curtain fan 8.

[0048] like Figure 3 , Figure 7 and Figure 8 As shown, a user detection module 7 is provided in the housing 9 in the direction of the user. The user detection module 7 is an infrared thermopile detection sensor or an infrared radar, etc. The user detection module 7 is used to detect whether there is a user approaching the range hood. This detection method is a detection method commonly used by those skilled in the art. However, in fact, the goal of this solution is to detect users entering the kitchen space. The power, reaction cycle, and appropriate position of the infrared thermopile detection sensor or the infrared radar can be adjusted to detect users entering the kitchen. The user's operating time in the kitchen environment is very limited. However, when users cook in the kitchen environment, PM2.5, TVOC and other pollutants are often the most concentrated. Therefore, in order to avoid the user being triggered to discharge by the high-voltage electrode of the negative ion emission head 6 and to maintain the negative ion release amount of the user in the cooking environment, the overall environmental friendliness needs to be comprehensively considered.

[0049] In some exemplary embodiments, the negative ion component has two working modes, namely the first working mode and the second working mode. In the first working mode, the user detection module 7 cannot detect the user. At this time, the negative ion emission head 6 generates negative ions with a first duty cycle, and the wind curtain fan 8 runs at a first speed, the first speed is 70% to 100% of the maximum speed of the wind curtain fan 8, and the negative ion emission head 6 runs in the first area of ​​the wind curtain air duct. When the user detection module 7 detects that the user is approaching, the negative ion component enters the second working mode, and the negative ion emission head 6 generates negative ions with a second duty cycle, and the second duty cycle is less than the first duty cycle. In the second working mode, the wind curtain fan 8 runs at a second speed, and the second speed is 30% to 50% of the maximum speed of the wind curtain fan. By setting different first speeds and second speeds, different negative ion emission amounts and air supply amounts are achieved. The negative ion emission head 6 runs in the second area of ​​the wind curtain air duct, and the second area is closer to the wind curtain fan 8 than the first area. The efficiency of the negative ion emission head 6 in emitting negative ions will be affected by the surrounding environment, and the influence is quite large. For example, the detection value of the freely set negative ion emission head 6 at 5 cm can reach 130 million per cubic centimeter. When it is set in the first area, the detection value of the negative ion emission head 6 at 5 cm is sharply reduced to 18 million per cubic centimeter, and when it is set in the second area, the detection value of the negative ion emission head 6 at 5 cm is sharply reduced to 3 million per cubic centimeter. Therefore, by setting the position of the negative ion emission head 6, the emission amount of negative ions can be significantly affected, and the situation of eliminating PM2.5 is also significantly affected.

[0050] The negative ion component has a larger duty cycle in the first working mode, the wind curtain fan 8 has a higher fan speed, and in the first area, it is closer to the outside of the wind curtain air duct. All conditions are for obtaining a larger release of negative ions. In this case, a larger duty cycle will allow the negative ion emitter 6 to be in a state of releasing negative ions for a longer time. Moreover, after our experiments, when the duty cycle is 0.7 to 0.95, there is better release data, so there is still a need for a time interval to stop releasing. In some of our products, a higher wind speed is 2.8-5.5 meters per second. Under this wind speed, if the range hood is turned on, the wind from the wind curtain fan 8 will make the release of negative ions reach the maximum value. However, when the range hood is turned on, it is not advisable to use a wind speed exceeding 2.5 meters per second, because when it exceeds 2.5 meters per second, there is a certain probability that the wind curtain wind will draw in the internal air volume and escape outside the range hood, causing an increase in PM2.5. The negative ion emitter 6 is in the first area, especially when the negative ion emitter 6 is located outside the shell 9, combined with a higher wind curtain wind speed, the concentration of negative ions will be significantly increased. Our actual test value can reach 26 million per cubic centimeter. Of course, when the negative ion emitter 6 is located outside the shell 9, it will also give the user an electric shock, and the high concentration of negative ions will sometimes affect the user's use.

[0051] The negative ion component has a smaller duty cycle in the second working mode, the air curtain fan 8 has a lower fan speed, and the air curtain fan 8 in the second area is closer to the air curtain duct. All conditions lead to a reduction in the amount of negative ions released. In this case, a smaller duty cycle will cause the negative ion emitter 6 to stop releasing negative ions for a longer time. Moreover, according to our experiments, when the duty cycle is 0.1 to 0.23, the success rate of negative ion discharge to the human body is reduced, and even if discharge occurs, the feeling is relatively weak. At the same time, some of the negative ions discharged into the air will be adsorbed on the surface of the range hood, especially for range hoods with metal shells. When you use your hands to clean the surface of the range hood with negative ions, you will feel an electric shock. When the duty cycle is as low as 0.1 to 0.23, due to the longer non-discharge time, even for range hoods with metal shells, there will be no electric shock. During the normal range hood startup process (this time basically coincides with the time the user is in the kitchen space or is less than the time the user is in the kitchen), the wind speed will be significantly reduced. In the actual solution, a wind speed of 1.0-1.8 meters per second is used to control the actual amount of negative ions emitted by the negative ion emitter 6. When the user is in the kitchen environment, whether the higher negative ion concentration has a positive or negative impact on the user is still unknown. It is just that in the natural environment, the environment with a negative ion concentration of several thousand to ten thousand is better. Therefore, in our second working mode, when the duty cycle is reduced, the wind speed is reduced, and the negative ion emitter is located in the second area (even a child's fingers can hardly touch the negative ion emitter 6), the negative ion concentration in the user's space can be within the range of several thousand per cubic meter to ten thousand per cubic meter. On the one hand, the negative ion emitter head 6 is set in the second area through the driving mechanism to prevent the user's body, especially the fingers, from touching the negative ion emitter head 6 to generate discharge; on the other hand, the duty cycle of the negative ion emitter head 6 is reduced to reduce the user's negative experience; finally, by reducing the wind speed of the wind curtain and combining the above two technical means, after the negative ions are released, the negative ion concentration in the space where the user is located is 3000-10000 per cubic centimeter, avoiding the possible risks of high concentration of negative ions and improving the user experience.

[0052] In some other embodiments, Figure 1 and Figure 2As shown, the housing 9 of the range hood is provided with an electrical equipment installation cavity, and a main control module is provided in the electrical equipment installation cavity. The main control module includes a main control circuit board and an MCU chip provided on the main control circuit board. The housing 9 is also provided with a PM2.5 detection cavity 13, and a PM2.5 detection module is provided in the PM2.5 detection cavity 13. The PM2.5 detection module is a PM2.5 detector, a PM2.5 sensor, an air quality sensor, etc. The housing 9 includes a top plate 19, and a first air vent 14 connected to the PM2.5 detection cavity 13 is provided on the top plate 19, so as to facilitate the introduction of air in the kitchen to the PM2.5 detection module. The top plate 19 is also provided with a second air vent 15 connected to the air intake port of the air curtain fan 8, and the air curtain fan 8 can inhale air through the second air vent 15. The housing 9 of the range hood is also provided with a control panel 16, and the control panel 16 is electrically connected to the main control module. A marquee is disposed inside the housing 9 . The marquee is disposed along the periphery of the control panel 16 , and the marquee can be seen through the control panel 16 .

[0053] like Fig.12 As shown, the motor 3 and negative ion emitter 6 of the negative ion component, the user detection module 7, the exhaust fan, the air curtain fan 8, the marquee and the PM2.5 detection module are all electrically connected to the main control module. The PM2.5 detection module detects the fume concentration C of the air in the kitchen and transmits the detection result to the main control module of the range hood. The main control module is provided with a first fume concentration threshold C1, a second fume concentration threshold C2, a third fume concentration threshold C3 and a fourth fume concentration threshold C4, and C1<C2<C3<C4.

[0054] Since the voltage of the negative ion emission head 6 during operation can reach 3KV-7.5KV, and this will cause a higher voltage on the housing 9, it is necessary to prevent the user from directly touching the housing 9 and the negative ion emission head 6 with their hands to ensure safety.

[0055] In this embodiment, the negative ion component has four working modes, namely a first working mode, a second working mode, a third working mode and a fourth working mode.

[0056] In the first working mode, the user detection module 7 cannot detect the user. At this time, the negative ion emission head 6 generates negative ions at a first duty cycle, and the wind curtain fan 8 runs at a first speed, and the negative ion emission head 6 runs in the first area of ​​the wind curtain air duct. When the user detection module 7 detects that the user is approaching, the negative ion component enters the second working mode, and the negative ion emission head 6 generates negative ions at a second duty cycle, and the second duty cycle is less than the first duty cycle. The wind curtain fan 8 runs at a second speed, and the negative ion emission head 6 runs in the second area of ​​the wind curtain air duct, and the second area is closer to the wind curtain fan 8 than the first area.

[0057] In the second working mode, the user detection module 7 detects the user, and the cooking state belongs to the state corresponding to the working mode. At this time, the negative ion emission head 6 generates negative ions through a second duty cycle with a lower value, which is safer to use. At this time, under the control of the main control module, the motor 3 drives the negative ion emission head 6 away from the wind curtain fan 8 and moves to the second area for operation, such as Figure 3 , Figure 4 and Figure 5 As shown, at this time, the negative ion emission head 6 is away from the wind curtain outlet to prevent the user from touching it and causing danger.

[0058] In the second working mode: the PM2.5 detection module is started, and the PM2.5 detection module detects the oil fume concentration C in the air in the kitchen, and transmits the detection result to the main control module of the range hood. The main control module compares the received oil fume concentration C with the set oil fume concentration threshold, and performs the following operations:

[0059] When C<C1, the air curtain fan 8 runs at the initial second speed, which can be set to a low gear, the negative ion emitter 6 generates negative ions at the initial second duty cycle, and the smoke exhaust fan of the range hood runs at the initial cruise gear, which can be set to a low gear. At this time, the marquee is not lit. At this time, the smoke concentration in the kitchen air is low, and a lot of negative ions are not needed, and the smoke exhaust fan is not needed to exhaust the air in the smoke collection chamber faster, nor is a wind curtain with a fast wind speed needed to prevent oil smoke from escaping.

[0060] When C1≤C<C2, the air curtain fan 8 and the smoke exhaust fan are both increased to the middle range, the negative ion emitter 6 increases the duty cycle, and the marquee flashes. The smoke concentration in the kitchen air is lower than when C<C1, and it is increased. At this time, more negative ions are appropriately generated, and the exhaust air of the smoke exhaust fan and the wind speed of the air curtain are appropriately increased to enhance the fume exhaust effect. The marquee flashes to remind users that the fume concentration in the kitchen air has increased, and the operation time of the negative ion emitter 6 has been extended, so pay attention to safety.

[0061] When C2≤C<C3, the wind curtain fan 8 and the smoke exhaust fan are both raised to high speed, the negative ion emitter 6 further increases the duty cycle, and the marquee runs. The smoke concentration in the kitchen air is lower than when C1≤C<C2, and it is increased again. At this time, more negative ions need to be generated, the smoke exhaust fan exhausts faster, and the wind curtain wind is at a higher speed. Therefore, the wind curtain fan 8 and the smoke exhaust fan are both raised to high speed, and the duty cycle of the negative ion emitter 6 generating negative ions is further increased. The running of the marquee has a good warning effect, which can effectively remind users not to touch the housing 9 to prevent users from electric shock.

[0062] When C3≤C<C4, the second working mode is exited and the third working mode is entered. In the third working mode: the wind curtain fan 8 runs at the highest speed, and the smoke exhaust fan runs at a gear one level higher than the high gear. The negative ion emitter head 6 runs at a third duty cycle, the third duty cycle is greater than the second duty cycle, the third duty cycle is 0.5 to 0.8, and the marquee keeps running. At this time, the oil fume concentration in the kitchen air is very high. The wind curtain fan 8 generates the fastest wind curtain wind to prevent the oil fume in the smoke collecting chamber from escaping. The smoke exhaust fan generates a stronger exhaust to quickly discharge the air containing high concentration of oil fume in the smoke collecting chamber. At the same time, more negative ions are generated by the negative ion emitter head 6 to remove the oil fume in the kitchen air. Although more negative ions are generated at this time, they will not have a significant impact on users due to the neutralization of the positively charged oil fume. In order to improve the utilization efficiency of negative ions, the motor 3 of the negative ion component drives the negative ion emission head 6 away from the wind curtain fan 8. At the same time, in order to improve the safety of use, the negative ion emission head 6 is close to the wind curtain outlet but does not protrude from the wind curtain outlet.

[0063] When C4≤C, exit the third working mode and enter the fourth working mode. In the fourth working mode: after the negative ion emitter 6 runs at the highest duty cycle for 30-90 seconds, it is reduced to the third duty cycle. The wind curtain fan 8 runs at 70%-90% of the maximum speed, and the smoke exhaust fan of the range hood runs at the highest level of stir-frying for 20-60 seconds, then reduces the level to run, and the marquee keeps running. At this time, the oil fume concentration in the kitchen air is further increased. The smoke exhaust effect of the range hood is improved by increasing the smoke exhaust capacity of the smoke exhaust fan and appropriately reducing the wind curtain wind speed. When the wind curtain wind speed is too fast, it may disrupt the air flow in the smoke collection cavity to a certain extent, resulting in some oil smoke being unable to be smoothly sucked in and discharged by the smoke exhaust fan, affecting the smoke exhaust effect of the range hood, so the speed of the wind curtain fan 8 is appropriately reduced, but it cannot be too low, otherwise it will lead to poor effect in blocking the escape of oil smoke.

[0064] In summary, the present invention has a negative ion component and a user detection module 7, the user detection module 7 is used to detect whether the user is close to the range hood, and the negative ion component includes a negative ion emission head 6 and a driving mechanism. The present invention can flexibly drive the negative ion emission head 6 to move along the upstream and downstream directions of the wind curtain air duct through the driving mechanism according to the detection result of the user detection module 7, and flexibly adjust the amount of negative ions and the use effect generated by the negative ion emission head 6, so as to make full use of the negative ion function and effectively ensure the safety of use. At the same time, the present invention uses the wind curtain fan 8 to blow away the negative ions, and there is no need to set up an additional blower or fan for blowing away the negative ions, so as to make full use of the existing structure of the range hood and reduce the difficulty and cost of improving and developing the range hood.

[0065] Since the range hood is made of sheet metal components, when the negative ion function is activated, some negative ions will be adsorbed on the surface of the range hood, which may cause electric shock to the user. In addition, when the negative ion function of the range hood is activated, a voltage of 3KV or above will be generated. The voltage of 3KV or above generated when the negative ion function is running will also cause surge pulse impact to the subsequent circuit. In order to solve the above problems, the negative ion control circuit is optimized. For the optimized negative ion operation control circuit diagram, please refer to Fig.13 .

[0066] like Fig.13 As shown, in some embodiments, the control circuit of the negative ion component includes a high-frequency ripple suppression circuit, and the high-frequency ripple suppression circuit includes an inductor L, a capacitor C1 and a capacitor C2, and the capacitor C1 and the capacitor C2 are connected in parallel with each other, and the inductor L is connected in series between the capacitor C1 and the capacitor C2, so that the inductor L, the capacitor C1 and the capacitor C2 form a Π-type LC filter circuit, and when the negative ion emission head 6 is started, the high-frequency ripple generated by the negative ions and the pulsation of the current affect the front-end circuit. In order to avoid the voltage of 3KV and above generated when the negative ion emission head 6 is running, the surge pulse suppression circuit is specially set, and the surge pulse suppression circuit includes a transient suppression diode TVS1 connected in parallel with the capacitor C1. When the two poles are subjected to a reverse transient high-energy impact, it can change the high impedance between the two poles into a low impedance at a speed of 10 to the negative 12th power of seconds, absorb up to several kilowatts of surge power, and clamp the voltage between the two poles at a predetermined value, effectively protecting the latter circuit from interference damage.

[0067] like Fig.13 As shown, since the negative ion emission head 6 cannot be started for a long time, a time control circuit is added to control the start-up time of the negative ion emission head 6. The time control circuit includes a resistor R1, a resistor R2, a transistor Q1 and a capacitor C5. The transistor Q1 is electrically connected to the main control module of the range hood. The main control module controls the conduction of the transistor Q1 to realize the start-up of the negative ion function.

[0068] like Fig.13As shown, in order to prevent the 12V input terminal from being connected to the negative ion emitter 6 and causing damage, a power supply reverse connection protection circuit is added to the circuit. The power supply reverse connection protection circuit includes a P-MOS tube Q3, a resistor R13, a capacitor C11, a voltage regulator D1 and a resistor R14. The resistor R13 is connected in parallel to the G pole and the S pole of the P-MOS tube Q3. When the power is powered on, the VGS conduction voltage is provided to the P-MOS tube Q3 to make the P-MOS tube Q3 saturated and turned on, and the negative ion emitter has a 12V voltage input; the capacitor C11 is connected in parallel to the G pole and the S pole of the P-MOS tube Q3 for a slow start effect; when the negative ion emitter is started, a large impact current will appear, which will cause electromagnetic interference and affect the negative ions. Therefore, it is necessary to "slowly" power on to control the rising slope and amplitude of the input current. The voltage regulator D1 is connected in parallel with the capacitor C11 and the resistor R13 to prevent the 12V voltage from being too high to break through the P-MOS tube Q3. When the 12V voltage is reversely connected, the resistor R13 cannot make the G pole of the P-MOS tube Q3 generate the VGS conduction voltage, and the P-MOS tube Q3 cannot be turned on, so it plays a role in power-on reverse connection protection.

[0069] like Fig.13 As shown, in some embodiments, even if the negative ion emitter head 6 in the second working mode is retracted into the second area, since the entire air duct is open, it is still possible that during the wiping process of the range hood or when the child is playing, a wiping wipe or a finger may enter the second area to trigger the discharge of the negative ion emitter head 6, thereby causing the user experience to deteriorate. In other embodiments, even if the user is in the kitchen, the local air pollution or the air pollution in the kitchen is heavy, and the duty cycle of 0.1 to 0.23 cannot meet the PM2.5 reduction requirements. The duty cycle needs to be increased to 0.3-0.5, and the discharge of the negative ion emitter head 6 at this time will cause stinging to the user; further solutions are needed to overcome pollution and improve user experience.

[0070] Regarding the problems of the above embodiments, the power supply end 1 and the power supply end 2 are used to supply power to the negative ion plug connector. And an electric shock protection circuit is connected in series along the power supply end 1. When the negative ion emitter 6 starts to generate a high voltage of more than 3KV, the negative ions are blown out by the air curtain fan 8. Therefore, an electric shock protection circuit is added to the circuit, which can cut off the 12V output within 30 milliseconds when a person gets an electric shock, further reducing the discomfort of the user caused by the electric shock of the negative ion emitter 6. Specifically, the electric shock protection circuit includes a comparison circuit and a power control circuit. The comparison circuit includes a sampling resistor R6, and the current passing through the negative ion emitter will also pass through the sampling resistor R6. The comparison circuit also includes a chip U5, a resistor R4, a resistor R5, and a resistor R7. By detecting the working current I1 of the negative ion emitter 6 and the resistance value r of the sampling resistor R6, the sampling voltage U0 = I1 * r is calculated. The voltage across the resistors R4 and R5 is the reference voltage Ui. When the negative ion emitter 6 touches a finger or other discharge body and gets an electric shock, the current passing through the resistor R6 increases significantly, and the voltage across R6 will also increase rapidly. When U0 > Ui, the chip U5 outputs a high level, and the power control circuit cuts off the 12V power supply of the negative ion emitter 6. When U0 < Ui, the chip U5 outputs a low level, and the power control circuit conducts the power supply of the negative ion emitter 6, and the negative ion emitter 6 works normally. The power control circuit includes a capacitor C10, a resistor R10, a resistor R11, a triode Q2, and a resistor R12. The signal output end of the chip U5 is connected in parallel with the capacitor C10 to suppress signal ripples, and is connected in series with the resistor R10 to the control pin of the triode Q2. The control pin of the triode Q2 is connected in parallel with the ground through a pull-down resistor R11. When the negative ion emitter 6 touches a finger or other discharge body and gets an electric shock, the current passing through the resistor R6 increases significantly, and the voltage across R6 will also increase rapidly. At the same time, the chip U5 will output a high level, and the triode Q2 conducts to the ground, so that the electrical signal of the control pin of the P-MOS transistor Q3 is quickly pulled low, and the P-MOS transistor Q3 is cut off to disconnect the 12V input and stop supplying power to the negative ion emitter 6. The use of a hardware comparison circuit and a power control circuit can effectively cut off the power supply in time during the discharge process, quickly reduce the input electric power of the high-voltage package, and thus reduce the discharge energy. When the chip U5 outputs a low level, the triode Q2 does not conduct, and the conduction voltage VGS of the control pin of the P-MOS transistor Q3 always remains high, and the 12V input supplies power to the negative ion emitter 6.

[0071] By setting up the electric shock protection circuit, electric shock protection can be effectively achieved. When an electric shock occurs, the working current of the negative ion emitter 6 suddenly increases. When it is higher than the set value, the 12V power input is immediately cut off. When the normal working current is restored, the 12V power input is restored.

[0072] In summary, by optimizing the negative ion operation control circuit, the high-frequency ripple generated when the negative ion emitter head is started can be reduced to prevent the pulsation of current when the negative ion emitter head is started from affecting the front-end circuit; surge power can be absorbed to avoid surge pulse impact on the subsequent circuit; the startup time of the negative ion emitter head can be controlled, and the power supply of the negative ion emitter head can be automatically cut off in time to prevent electric shock to the human body; and the negative ion emitter head can be powered off when the power supply input is connected reversely.

[0073] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A range hood with a negative ion component, comprising a smoke collecting chamber, characterized in that: An air suction port is provided in the smoke collecting chamber; The negative ion assembly comprises a negative ion emission head and a driving mechanism, wherein the negative ion emission head is arranged in the wind curtain duct, and an adjustable speed wind curtain fan is arranged upstream of the wind curtain duct; the negative ion emission head is connected to the driving mechanism, and the driving mechanism drives the negative ion emission head to move; The negative ion component has at least two working modes. In the first working mode, the negative ion emission head generates negative ions at a first duty cycle, and the wind curtain fan operates at a first speed, and the negative ion emission head operates in the first area of ​​the wind curtain air duct; It also includes a user detection module, which is arranged on the housing of the range hood and faces the direction where the user is; When the user detection module detects that a user is approaching, the negative ion component enters a second working mode, the negative ion emission head generates negative ions at a second duty cycle, the wind curtain fan operates at a second speed, and the negative ion emission head operates in a second area of ​​the wind curtain air duct; The second duty cycle is smaller than the first duty cycle, and the second area is closer to the air curtain fan than the first area.

2. The range hood with a negative ion component according to claim 1, characterized in that: The first rotation speed is 70%-100% of the maximum rotation speed of the air curtain fan, the user detection module is an infrared thermopile detection module or a radar detection module; the first duty cycle is 0.7-0.95, and the second duty cycle is 0.1-0.

23.

3. The range hood with a negative ion component according to claim 1, characterized in that: The driving mechanism of the negative ion component includes a mounting bracket and a guide rail, wherein the mounting bracket is arranged on the housing of the range hood, and the guide rail is arranged on the mounting bracket or the housing of the range hood; a motor is installed on the mounting bracket, and a gear is installed on the rotating shaft of the motor; a track groove extending along the upstream and downstream directions of the air curtain duct is arranged on the guide rail, a rack is slidably installed in the track groove, and the negative ion emission head is connected to the rack.

4. The range hood with a negative ion component according to claim 3, characterized in that: A cyclone base and a fixed bracket are arranged on the shell of the range hood below the wind curtain fan, the fixed bracket is connected to the shell of the range hood, the cyclone base is fixedly mounted on the fixed bracket, and the wind curtain fan is mounted on the cyclone base; a wind curtain air outlet is arranged on the cyclone base; the negative ion emitter has a cross bar portion, the cyclone base has a wind curtain air cavity connecting the wind curtain air outlet and the wind curtain fan exhaust port, and one side of the cyclone base is provided with an opening structure for the cross bar portion of the negative ion emitter to pass through and connected to the wind curtain air cavity.

5. The range hood with a negative ion component according to claim 1, characterized in that: The shell of the range hood is provided with a PM2.5 detection chamber, and the PM2.5 detection chamber is provided with a PM2.5 detection module. The shell includes a top plate, and the top plate is provided with a first air vent connected to the PM2.5 detection chamber and a second air vent connected to the air suction port of the air curtain fan; the PM2.5 detection module is electrically connected to the main control module of the range hood, and the main control module is electrically connected to the exhaust fan of the range hood, and the driving motor of the exhaust fan is an adjustable speed motor; the main control module is provided with a first oil fume concentration threshold C1, a second oil fume concentration threshold C2, a third oil fume concentration threshold C3 and a fourth oil fume concentration threshold C4, and C1<C2<C3<C4; The housing of the range hood is also provided with a control panel, and a marquee is provided inside the housing, the marquee is electrically connected to the main control module, the marquee is provided along the periphery of the control panel, and the marquee can be seen through the control panel; In the second working mode: the PM2.5 detection module detects the oil fume concentration C in the air in the kitchen and transmits the detection result to the main control module of the range hood. The main control module compares the received oil fume concentration C with the set oil fume concentration threshold and performs the following operations: When C<C1, the air curtain fan runs at the initial second speed, the negative ion emitter generates negative ions at the initial second duty cycle, the smoke exhaust fan of the range hood runs at the initial cruising gear, and the marquee is off; When C1≤C<C2, the air curtain fan increases its speed, the negative ion emitter increases its duty cycle, the smoke exhaust fan of the range hood increases its gear, and the marquee flashes and runs; When C2≤C<C3, the air curtain fan increases its speed again, the negative ion emitter increases its duty cycle again, the smoke exhaust fan of the range hood increases its gear again, and the marquee runs; When C3≤C<C4, exit the second working mode and enter the third working mode. In the third working mode: the air curtain fan runs at the highest speed, the driving mechanism of the negative ion component drives the negative ion emission head away from the air curtain fan, but the negative ion emission head is not exposed, the negative ion emission head further increases the duty cycle to the third duty cycle, the smoke exhaust fan of the range hood increases one gear again, and the gear is not the highest gear of the smoke exhaust fan, and the marquee runs; When C4≤C, exit the third working mode and enter the fourth working mode. In the fourth working mode: the negative ion emitter runs at the highest duty cycle for N seconds, and then reduces to the third duty cycle. The air curtain fan runs at 70%-90% of the maximum speed. The smoke exhaust fan of the range hood runs at the highest gear for M seconds, and then reduces one gear. 30≤N≤90, 20≤M≤60; the marquee runs in a running mode.

6. The range hood with a negative ion component according to claim 1, characterized in that: The control circuit of the negative ion component includes one or more of a high-frequency ripple suppression circuit, a surge pulse suppression circuit, a time control circuit, an electric shock protection circuit and a power supply reverse connection protection circuit; the high-frequency ripple suppression circuit is used to reduce the high-frequency ripple generated when the negative ion emitter head is started, so as to prevent the pulsation of the current when the negative ion emitter head is started from affecting the front-end circuit; the surge pulse suppression circuit is used to absorb surge power to avoid surge pulse impact on the subsequent circuit; the time control circuit is used to control the startup time of the negative ion emitter head, and the electric shock protection circuit is used to cut off the power supply of the negative ion emitter head to prevent electric shock to the human body; the power supply reverse connection protection circuit is used to not power on when the power supply input of the negative ion emitter head is reversed.

7. The range hood with a negative ion component according to claim 6, characterized in that: The high-frequency ripple suppression circuit includes an inductor L, a capacitor C1, and a capacitor C2. The capacitor C1 and the capacitor C2 are connected in parallel with each other, and the inductor L is connected in series between the capacitor C1 and the capacitor C2. The surge pulse suppression circuit includes a transient voltage suppression diode TVS1 connected in parallel with the capacitor C1.

8. The range hood with a negative ion component according to claim 6, characterized in that: The time control circuit includes a resistor R1, a resistor R2, a triode Q1, and a capacitor C5. The triode Q1 is electrically connected to the main control module of the range hood.

9. The range hood with a negative ion component according to claim 6, characterized in that: The power supply reverse connection protection circuit includes a P-MOS transistor Q3, a resistor R13, a capacitor C11, a zener diode D1, and a resistor R14. The resistor R13 is connected in parallel between the G pole and the S pole of the P-MOS transistor Q3. When the power supply is powered on, it provides a VGS conduction voltage to the P-MOS transistor Q3 to make the P-MOS transistor Q3 saturated and conducting, and there is a 12V voltage input to the negative ion emitter. The capacitor C11 is connected in parallel between the G pole and the S pole of the P-MOS transistor Q3 for soft start. The zener diode D1 is connected in parallel with the capacitor C11 and the resistor R13 to prevent the 12V voltage from being too high and breaking down the P-MOS transistor Q3.

10. The range hood with a negative ion component according to claim 9, characterized in that: The electric shock protection circuit includes a comparison circuit and a sampling resistor R6. The comparison circuit includes a chip U5, a resistor R4, a resistor R5, and a resistor R7. By detecting the working current I1 of the negative ion emitter and the resistance value r of the sampling resistor R6, the sampling voltage U0 = I1 * r is calculated. The voltage across the resistor R4 and the resistor R5 is the reference voltage Ui. When U0 > Ui, the chip U5 outputs a high level, and the power supply control circuit cuts off the power supply to the negative ion emitter. When U0 < Ui, the chip U5 outputs a low level, and the power supply control circuit conducts the power supply to the negative ion emitter, and the negative ion emitter works normally. The electric shock protection circuit further includes a power supply control circuit. The power supply control circuit includes a capacitor C10, a resistor R10, a resistor R11, a triode Q2, and a resistor R12. The signal output terminal of the chip U5 is connected in parallel with the capacitor C10 to suppress signal ripple, and is connected in series with the resistor R10 to the control pin of the triode Q2. The control pin of the triode Q2 is connected in parallel with the ground and a pull-down resistor R11. When the chip U5 outputs a high level, the triode Q2 conducts and is grounded, so that the electrical signal of the control pin of the P-MOS transistor Q3 is pulled low, and the P-MOS transistor Q3 is cut off to disconnect the 12V input and stop supplying power to the negative ion emitter. When the chip U5 outputs a low level, the triode Q2 does not conduct, and the VGS conduction voltage of the control pin of the P-MOS transistor Q3 always remains high, and the 12V input supplies power to the negative ion emitter.

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