Control circuit of range hood

Abstract

The utility model discloses a control circuit of a range hood, the range hood comprises a range hood main body and an oil cup device, the bottom of the range hood main body is provided with an oil discharge port and a second wiring terminal, the oil cup device is detachably installed at the bottom of the range hood main body, the oil cup device is provided with an oil collecting groove, a heating assembly and a first wiring terminal, the oil collecting groove is communicated with the oil discharge outlet, the heating assembly is connected with the first wiring terminal, and the first wiring terminal is selectively connected with the second wiring terminal; the control circuit comprises a heating drive circuit and a main controller MCU, the heating drive circuit is used for controlling the working state of the heating assembly, and the main controller MCU is connected with the heating drive circuit and the second wiring terminal. According to the control circuit of the range hood, the oil cup device can be conveniently disassembled, assembled and electrified, and the oil cup device can be conveniently and simply cleaned.

Description

TECHNICAL FIELD

[0001] The utility model relates to range hood technical field especially relates to a control circuit of range hood. BACKGROUND

[0002] At present, the oil cup of range hood is taken down to clean, and the user is more troublesome when cleaning, and it is difficult to clean completely, and it is easy to dirty the hand without wearing gloves, in addition, long -term disassembly is easy to damage the oil cup hook, leads to the oil cup to hang not steady. SUMMARY

[0003] The utility model aims at at least in a certain extent solve the problem of one of prior art related, for this purpose, the utility model provides a control circuit of range hood, the dismounting and the electricity connection of oil cup device are convenient, and simple cleaning is convenient to the oil cup device.

[0004] According to the control circuit of range hood provided in the above, it realizes through the following technical scheme:

[0005] A control circuit of range hood, the range hood includes range hood main part and oil cup device, is equipped with oil discharge port and second wiring terminal in range hood main part bottom, the oil cup device can be detachably installed in range hood main part bottom, is equipped with oil collecting groove, heating assembly and first wiring terminal on the oil cup device, the oil collecting groove is linked together with oil discharge port, the heating assembly is connected with first wiring terminal, and first wiring terminal is selectively connected with second wiring terminal;The control circuit includes heating drive circuit and main controller MCU, and the heating drive circuit is used for controlling the working state of heating assembly, and main controller MCU is connected with heating drive circuit and second wiring terminal respectively.

[0006] In some embodiments, the heating drive circuit includes a first switching unit, a first control unit and a second control unit, the first end of the first switching unit is connected to the live wire ACL, the second end is connected to the 5th pin of the first wiring terminal, the third end is connected to the ground wire and the 4th pin of the main controller MCU through the second control unit respectively, and the fourth end is connected to the ground wire, the power supply and the 20th pin of the main controller MCU through the first control unit respectively;The heating drive circuit further includes a second switching unit and a third control unit, the first end of the second switching unit is connected to the neutral wire ACN, the second end is connected to the 6th pin of the second wiring terminal, and the third end is connected to the ground wire and the 4th pin of the main controller MCU through the third control unit respectively.

[0007] In some embodiments, the first switch unit comprises a relay REL1, a diode D6 connected in parallel with the coil of the relay REL1, a cathode of the diode D6 connected with a power supply, an anode of the diode D6 connected with the fourth pin of the main controller MCU and the ground wire through the second control unit, a first contact of the relay REL1 connected with the live wire ACL, a second contact of the relay REL1 connected with the sixth pin of the first terminal, and an electrolytic capacitor EC1 connected in parallel with the diode D6; the first control unit comprises a transistor Q1 and a MOS tube TR2, an emitter of the transistor Q1 connected with the ground wire, a base of the transistor Q1 connected with the twentieth pin of the main controller MCU, a collector of the transistor Q1 connected with the gate of the MOS tube TR2, a source of the MOS tube TR2 connected with the power supply, and a drain of the MOS tube TR2 connected with the fourth terminal of the relay REL1 and the ground wire respectively; the second control unit comprises a transistor Q2, an emitter of the transistor Q2 connected with the ground wire, a base of the transistor Q2 connected with the fourth pin of the main controller MCU, and a collector of the transistor Q2 connected with the third contact of the relay REL1.

[0008] In some embodiments, the second control unit further comprises a capacitor C11 and a resistor R19, the base of the transistor Q2 connected with the fourth pin of the main controller MCU through the resistor R19 and the capacitor C11 in sequence.

[0009] In some embodiments, the second switch unit comprises a relay REL2, a diode D7 connected in parallel with the coil of the relay REL2, a cathode of the diode D7 connected with the power supply, an anode of the diode D7 connected with the fourth pin of the main controller MCU and the ground wire through the third control unit, a first contact of the relay REL2 connected with the neutral wire ACN, a second contact of the relay REL2 connected with the sixth pin of the first terminal, and an electrolytic capacitor EC2 connected in parallel with the diode D7; the third control unit comprises a transistor Q3, an emitter of the transistor Q3 connected with the ground wire, a base of the transistor Q3 connected with the fourth pin of the main controller MCU, and a collector of the transistor Q3 connected with the third contact of the relay REL2.

[0010] In some embodiments, the third control unit further comprises a capacitor C12 and a resistor R20, the base of the transistor Q3 connected with the fourth pin of the main controller MCU through the resistor R20 and the capacitor C12 in sequence.

[0011] In some embodiments, the heating driving circuit further comprises a current conversion unit and a rectifier unit, the twentieth pin of the main controller MCU connected with the first control unit through the current conversion unit and the rectifier unit in sequence.

[0012] In some embodiments, the control circuit further comprises an on-off detection circuit connected with the main controller MCU, for detecting whether the second terminal is connected with the first terminal.

[0013] In some embodiments, the oil cup device is further provided with an oil outlet and a switch assembly, the oil outlet is in communication with the oil collecting groove, and the switch assembly is connected with the first terminal; the control circuit further comprises a switch driving circuit connected with the main controller MCU, for driving the switch assembly to open or close the oil outlet.

[0014] In some embodiments, the oil cup device is further provided with a temperature sensor and / or a turbidity sensor connected with the first terminal; the control circuit further comprises a temperature detection circuit and / or a turbidity detection circuit, the temperature detection circuit is connected with the main controller MCU, for detecting the medium temperature in the oil collecting groove, and the turbidity detection circuit is connected with the main controller MCU, for detecting whether the medium in the oil collecting groove reaches a set position.

[0015] In some embodiments, the turbidity detection circuit comprises a voltage dividing unit, a resistor R4 and a capacitor C1, the 6th pin of the main controller MCU is connected with the ground wire and the 2nd pin of the second terminal through the voltage dividing unit respectively, the 1st pin of the second terminal is connected with the ground wire through the capacitor C1, and the resistor R4 is connected with the voltage dividing unit in parallel and connected with the ground wire.

[0016] In some embodiments, the turbidity detection circuit further comprises a calibration unit, the calibration unit comprises an operational amplifier U2, an amplification adjusting tube TR3 and a sampling resistor R8, the 5th pin of the main controller MCU is connected with the non-inverting input terminal of the operational amplifier U2, the inverting input terminal of the operational amplifier U2 is connected with the ground wire through the sampling resistor R8, the output terminal of the operational amplifier U2 is connected with the base of the amplification adjusting tube TR3, the emitter of the amplification adjusting tube TR3 is connected with the sampling resistor R8, and the collector of the amplification adjusting tube TR3 is connected with the 3rd pin of the second terminal.

[0017] Compared with the prior art, the utility model has at least the following beneficial effects:

[0018] 1. The oil cup device of the utility model is detachably installed at the bottom of the smoke machine main body, the heating assembly and the first terminal are arranged on the oil cup device, the second terminal is arranged at the bottom of the smoke machine main body, the oil cup device is convenient to disassemble and connect with electricity, and the heating assembly is controlled to heat and melt the solid oil dirt in the oil collecting groove, and then the oil is discharged, so that the oil cup device is simply cleaned.

[0019] 2. By using two control signals to control the heating assembly in the oil cup device, the main controller MCU can not output control signals due to interference or chip tube damage, effectively ensuring that the heating drive circuit is in an off state, and safety and reliability are enhanced;

[0020] 3. The connection of the first wiring terminal and the second wiring terminal is detected by the on-off detection circuit, and then the heating drive circuit is used to control the working of the heating assembly, which enhances the safety of the user not being electrified when touching the wiring terminal, and further enhances the safety protection measures. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the oil cup device in the embodiment of the utility model;

[0022] Figure 2 is an explosion Figure 1 of the oil cup device in the embodiment of the utility model;

[0023] Figure 3 is an explosion Figure 2 of the oil cup device in the embodiment of the utility model;

[0024] Figure 4 is a sectional view of the oil cup device in the embodiment of the utility model;

[0025] Figure 5 is a structural schematic diagram of the fixing seat in the embodiment of the utility model; Figure 1

[0026] Figure 6 is a structural schematic diagram of the fixing seat in the embodiment of the utility model; Figure 2

[0027] Figure 7 is a structural schematic diagram of the range hood in the embodiment of the utility model;

[0028] Figure 8 is an explosion of the range hood in the embodiment of the utility model;

[0029] Figure 9

[0030] Figure 10 is a circuit diagram of the heating drive circuit in the embodiment of the utility model;

[0031] Figure 11 is a circuit diagram of the turbidity detection circuit and the second wiring terminal in the embodiment of the utility model.

[0032] ​​In the figure: 1 - oil cup assembly, 10 - oil guide pipe, 11 - oil collecting groove, 111 - annular inclined surface, 12 - oil outlet, 13 - clamping part, 14 - lower concave cavity, 141 - wire passing hole, 15 - sunken platform, 16 - sealing glue; 2 - switch assembly, 21 - fixed seat, 211 - upper concave cavity, 2111 - opening, 212 - boss, 2121 - fixed column, 213 - wire passing hole, 214 - mounting part, 22 - control valve, 221 - valve core assembly; 3 - heating assembly, 31 - heating film, 32 - cover plate; 4 - first wiring terminal, 41 - switch connecting wire, 42 - heating connecting wire, 43 - temperature measuring connecting wire, 44 - turbidity connecting wire; 51 - temperature sensor, 52 - turbidity sensor;

[0033] 6 - smoke machine main body, 61 - oil discharge port, 62 - second wiring terminal, 63 - hook;

[0034] 71 - heating drive circuit, 711 - first switch unit, 712 - first control unit, 713 - second control unit, 714 - second switch unit, 715 - third control unit, 716 - current conversion unit, 717 - rectifier unit, 72 - main controller MCU, 73 - on-off detection circuit, 74 - switch drive circuit, 75 - temperature detection circuit, 76 - turbidity detection circuit. DETAILED DESCRIPTION

[0035] The following examples are used to illustrate the present application, but the present application is not limited by these examples. Modifications to the specific embodiments of the present application or equivalent replacements to some technical features are made without departing from the spirit of the present application, which should be covered in the technical solution range claimed by the present application.

[0036] Reference Figures 1-11 The present embodiment provides a control circuit of a smoke exhaust machine, the smoke exhaust machine comprising a smoke machine main body 6 and an oil cup device (not shown in the figure), the smoke machine main body 6 being provided with an oil discharge port 61 and a second wiring terminal 62 at the bottom, and hooks 62 being provided at the left and right sides of the bottom of the smoke machine main body 6, the hooks 62 being configured to be used for buckling connection with the oil cup device. The oil cup device is detachably installed at the bottom of the smoke machine main body 6, the oil cup device being provided with an oil collecting groove 11, a heating assembly 3 and a first wiring terminal 4, the heating assembly 3 being connected with the first wiring terminal 4 and being used for heating the medium in the oil collecting groove 11, and the first wiring terminal 4 being used for selectively connecting with the second wiring terminal 62.

[0037] The oil cup device is provided with a clamping portion 13 at a position corresponding to the hook 62. The clamping portion 13 is buckled and connected with the hook 62 at the bottom of the smoke machine body 6, so as to realize detachable installation of the oil cup device at the bottom of the smoke machine body 6. When the oil cup device is installed in place, the oil collecting groove 11 is in communication with the oil discharge port 61 of the smoke machine body 6, so that the oil collecting groove 11 of the oil cup device can collect the medium (such as oil stains or cleaning water) flowing downward from the oil discharge port 61 of the smoke machine body 6; and the first wiring terminal 4 is connected with the second wiring terminal 62, so as to facilitate power supply of the oil cup device, and at the same time, the quick disassembly and assembly of the oil cup device is not affected.

[0038] Referring to Figure 9 The control circuit includes a heating drive circuit 71 and a main controller MCU 72. The heating drive circuit 71 is used to control the working state of the heating assembly 3, so as to heat and melt the solid oil stains in the oil collecting groove 11 to discharge oil, so that the oil stains in the oil collecting groove 11 are more easily discharged, and simple cleaning of the oil cup device is realized. The main controller MCU 72 is connected with the heating drive circuit 71 and the second wiring terminal 62 respectively.

[0039] Referring to Figure 9 In this embodiment, the opposite ends of the heating assembly 3 are respectively connected with the 5th pin and the 6th pin of the first wiring terminal 4. The 5th pin and the 6th pin of the first wiring terminal 4 are used to be respectively connected with the 5th pin and the 6th pin of the second wiring terminal 62. The 5th pin and the 6th pin of the second wiring terminal 62 are respectively connected with the heating drive circuit 71, so that the heating drive circuit 71 can control the working state of the heating assembly 3 through the second wiring terminal 62 and the first wiring terminal 4 in sequence.

[0040] Referring to Figures 9-10The heating driving circuit 71 comprises a first switch unit 711, a first control unit 712 and a second control unit 713, the first end of the first switch unit 711 is connected with the live wire ACL, the second end is connected with the 5th pin of the first terminal 4, the third end is connected with the ground wire and the 4th pin of the main controller MCU respectively through the second control unit 713, the fourth end is connected with the ground wire, the power supply (for example, 12V power supply) and the 20th pin of the main controller MCU respectively through the first control unit 712, and the fourth end is connected with the power supply, so as to realize the on-off control of the first switch unit through two control units (i.e. two signal paths). In addition, the heating driving circuit 71 further comprises a second switch unit 714 and a third control unit 715, the first end of the second switch unit 714 is connected with the neutral wire ACN, the second end is connected with the 6th pin of the second terminal 62, the third end is connected with the ground wire and the 4th pin of the main controller MCU respectively through the third control unit 715, and the fourth end is connected with the power supply. As can be seen, the heating driving circuit 71 has two control signals, and the heating assembly 3 in the oil cup device is controlled to work by using the two control signals, so that it can be ensured that the main controller MCU will not have no output control signal due to interference or damage of the chip tube, and the safety and reliability are enhanced.

[0041] Specifically, the first switch unit 711 includes a relay REL1 and a diode D6 connected in parallel with the coil of the relay REL1, the cathode of the diode D6 is connected with the power supply, the anode of the diode D6 is connected with the 4th pin of the main controller MCU and the ground through the second control unit 713, the first contact of the relay REL1 is connected with the live wire ACL, the second contact is connected with the 5th pin of the first terminal 4, and the fourth contact is connected with the power supply. The first control unit 712 includes a transistor Q1 and a MOS tube TR2, the emitter of the transistor Q1 is connected with the ground, the base is connected with the 20th pin of the main controller MCU, and the collector is connected with the gate of the MOS tube TR2. In this embodiment, the base of the transistor Q1 is connected with the ground through the resistor R16 and connected with the 20th pin of the main controller MCU through the resistor R15 to divide the current flowing to the transistor Q1, thereby improving the stability and reliability of the conduction of the transistor Q1. The source of the MOS tube TR2 is connected with the power supply (for example, a 12V power supply), the drain of the MOS tube TR2 is connected with the ground and the fourth contact of the relay REL1 respectively, and in this embodiment, the drain of the MOS tube TR2 is connected with the ground through the diode D5 to protect the MOS tube TR2. In this way, the on-off of the MOS tube TR2 is controlled by +12V and the transistor Q1, thereby improving the safety in use. The second control unit 713 includes a transistor Q2, the emitter of the transistor Q2 is connected with the ground, the base is connected with the 4th pin of the main controller MCU through the resistor R19, and the collector is connected with the third contact of the relay REL1. In this way, the transistor Q2, the transistor Q1 and the MOS tube TR2 are cooperated to accurately control the attraction and release of the relay REL1.

[0042] In addition, the first switch unit 711 further includes an electrolytic capacitor EC1 connected in parallel with the diode D6 and the coil of the relay REL1, the drain of the MOS tube TR2 is connected with the positive electrode of the electrolytic capacitor EC1 and the fourth contact of the relay REL1 respectively, and the collector of the transistor Q2 is connected with the third contact of the relay REL1 and the negative electrode of the electrolytic capacitor EC1 respectively. In this way, when the heating driving circuit 71 is powered to attract the relay REL1, the electrolytic capacitor EC1 can be continuously charged, and the charging time of the electrolytic capacitor EC1 is only a few milliseconds to one second, which is very fast, thereby maintaining the attraction of the relay REL1 and saving power. The second control unit 713 further includes a capacitor C11 and a resistor R19, and the base of the transistor Q2 is connected with the 4th pin of the main controller MCU through the resistor R19 and the capacitor C11 in sequence.

[0043] Specifically, the second switch unit 714 includes a relay REL2 and a diode D7, the diode D7 is connected in parallel with the coil of the relay REL2, the cathode of the diode D7 is connected to the power supply, the anode of the diode D7 is connected to the 4th pin of the main controller MCU and the ground wire through the third control unit 715, the first contact of the relay REL2 is connected to the zero line ACN, the second contact is connected to the 6th pin of the first terminal 4, and the fourth contact is connected to the power supply. The third control unit 715 includes a triode Q3, the emitter of the triode Q3 is connected to the ground wire, the base is connected to the 4th pin of the main controller MCU, and the collector is connected to the third contact of the relay REL2, so that the triode Q3 can be used to reliably control the attraction or release of the relay REL2.

[0044] Reference Figures 9-10 The second switch unit 714 further includes an electrolytic capacitor EC2 connected in parallel with the diode D7, so that when the heating driving circuit 71 is powered on to attract the relay REL2, the electrolytic capacitor EC2 can be continuously charged, and the electrolytic capacitor EC2 is fully charged in only a few milliseconds to 1 second, so that the relay REL2 can be maintained in the attracted state. The third control unit 715 further includes a capacitor C12 and a resistor R20, and the base of the triode Q3 is connected to the 4th pin of the main controller MCU through the resistor R20 and the capacitor C12 in sequence.

[0045] Reference Figures 9-10 Further, the heating driving circuit 71 further includes a current conversion unit 716 and a rectifier unit 717, and the 20th pin of the main controller MCU is connected to the first control unit 712 through the current conversion unit 716 and the rectifier unit 717 in sequence. Thus, the 20th pin of the MCU outputs a PWM waveform, which is converted into AC through the current conversion unit 71, and then half-wave rectified through the rectifier unit 717, and then controlled through the first control unit 712 to control the +12V on-off of the first switch unit 711, thereby forming a first PWM signal. The third control unit 715 serves as a second PWM signal, and controls the attraction or release of the relay REL1 under the cooperation of the two PWM signals, thereby effectively enhancing the safety and reliability.

[0046] Specifically, the current conversion unit 716 includes a capacitor C9 and a resistor R14, the rectifier unit 717 includes a diode group and a capacitor C10, the first end of the diode group is connected to the ground wire, the second end is connected to the 20th pin of the main controller MCU through the resistor R14 and the capacitor C9 in sequence, the third end is connected to the base of the triode Q1 in the first control unit 712, and the third end is connected to the ground wire and the emitter of the triode Q1 in the first control unit 712 through the capacitor C10, respectively.

[0047] Reference Figure 9Further, the control circuit further comprises an on-off detection circuit 73 connected with the main controller MCU 72, which is used to detect whether the second terminal 62 is connected with the first terminal 4, i.e. whether the oil cup device is connected, so as to enhance the safety protection. In use, the connection between the first terminal and the second terminal is detected by the on-off detection circuit first. When the detection voltage value of the on-off detection circuit is high, it indicates that the oil cup is connected; otherwise, if the detection voltage value is low, it indicates that the oil cup is not connected, and at this time, the MCU controls the heating driving circuit 71 not to be powered on, so as to enhance the safety measures. After the detection voltage value of the on-off detection circuit is high, if it is needed to heat and melt the solid oil dirt in the oil collecting groove 11, the 4th and 20th pins of the MCU output signals at the same time, and the heating driving circuit 71 controls the heating assembly 3 to be powered on and work.

[0048] Specifically, the on-off detection circuit 73 comprises a resistor R21, a resistor R22 and a resistor R23. The 12th pin of the MCU is connected with the 9th pin of the second terminal 62 through the resistor R23, the resistor R21 and the 9th pin of the first terminal 4 in sequence, and the 8th pin of the second terminal 62 and the 8th pin of the first terminal 4 are respectively connected with a 12V power supply, so as to form a detection loop. One end of the resistor R22 is connected with a ground wire, and the other end is connected between the resistor R21 and the resistor R23, which is used to collect whether the voltage value is high. In addition, the on-off detection circuit 73 further comprises a capacitor C13, one end of which is connected with a ground wire, and the other end is connected between the 12th pin of the MCU and the resistor R23.

[0049] Reference Figure 9 Further, the oil cup device further comprises an oil outlet 12 and a switch assembly 2. The oil outlet 12 is connected with the oil collecting groove 11, and the switch assembly 2 is connected with the first terminal 4. The control circuit further comprises a switch driving circuit 74 connected with the 18th pin of the main controller MCU 72, which is used to drive the switch assembly 2 to open or close the oil outlet 12, so that the oil cup device can be controlled whether to automatically drain oil without disassembling the oil cup device.

[0050] Specifically, one end of the switch assembly 2 is connected with the 7th pin of the first terminal 4, and the other end is respectively connected with the 8th pin and the 9th pin of the first terminal 4. The switch driving circuit 74 comprises a MOS tube TR1, a resistor R12 and a diode D3. The gate of the MOS tube TR1 is connected with the 18th pin of the MCU through the resistor R12, the drain is connected with a ground wire, and the source is connected with a 12V power supply and the 7th pin of the second terminal 62 through the diode D3, and the 7th pin of the second terminal 62 is connected with the 7th pin of the first terminal 4. In addition, the switch driving circuit 74 further comprises a resistor R13, which is connected with the MOS tube TR1 in parallel, i.e. the resistor R13 is connected with the drain and the gate of the MOS tube TR1 respectively.

[0051] Reference Figures 9-11 Further, the oil cup device is also provided with a temperature sensor 51 and / or a turbidity sensor 52 connected with the first terminal 4. The control circuit further comprises a temperature detection circuit 75 and / or a turbidity detection circuit 76, the temperature detection circuit 75 is connected with the main controller MCU 72 for detecting the medium temperature in the oil collecting groove 11, and the main controller MCU can control the working state of the heating assembly 3 according to the medium temperature. The turbidity detection circuit 76 is connected with the main controller MCU 72 for detecting whether the medium in the oil collecting groove 11 reaches the set position, and the main controller MCU can control to determine whether the oil cup device needs to automatically discharge oil, that is, to determine whether the oil cup device is full of oil. When it is detected that the oil cup device is full of oil, the main controller MCU can control the working state of the heating assembly 3 and the switching assembly 2 according to the medium temperature.

[0052] Specifically, the temperature sensor 51 comprises an NTC1, one end of the NTC1 is connected with the 5V power supply and the 1st pin of the first terminal 4 respectively, and the other end is connected with the 4th pin of the first terminal 4. The temperature detection circuit 75 comprises a resistor R10 and a resistor R11, the 19th pin of U3 is connected with the 4th pin of the first terminal 4 through the resistor R10 and the 4th pin of the second terminal 62 in turn, and the resistor R11 is connected with the resistor R10 in parallel and with the ground, that is, one end of the resistor R11 is connected with the ground, and the other end is connected between the 4th pin of the second terminal 62, so as to detect the medium temperature in the oil cup device. In addition, the temperature detection circuit 75 further comprises a capacitor C7, the capacitor C7 is connected with the resistor R10 in parallel and with the ground, that is, one end of the capacitor C7 is connected with the ground, and the other end is connected with the 19th pin of the MCU.

[0053] Specifically, the turbidity sensor 52 comprises a transmitting tube and a receiving tube, one end of the transmitting tube and the receiving tube is connected with the 5V power supply and the 1st pin of the first terminal 4 respectively, the other end of the transmitting tube is connected with the 3rd pin of the first terminal 4, and the other end of the receiving tube is connected with the 2nd pin of the first terminal 4. In addition, the turbidity sensor 52 further comprises a capacitor C5 and a capacitor C6, the capacitor C5 is connected with the transmitting tube in parallel, and the capacitor C6 is connected with the receiving tube in parallel. The turbidity detection circuit 76 comprises a voltage division unit, a resistor R4 and a capacitor C1, the voltage division unit comprises resistors R2 and R3 arranged in parallel, the 6th pin of the main controller MCU is connected with the ground and the 2nd pin of the second terminal 62 through the voltage division unit respectively, and the 1st pin of the second terminal 62 is connected with the ground through the capacitor C1, the resistor R4 is connected with the voltage division unit in parallel and with the ground, that is, one end of the resistor R4 is connected with the ground, and the other end is connected with the 2nd pin of the second terminal 62, for collecting the receiving signal of the receiving tube in the turbidity sensor 52, so as to accurately detect whether the oil cup device is full of oil.

[0054] Reference Figure 11Further, the turbidity detection circuit 76 further comprises a calibration unit, the 5th pin of the main controller MCU is connected with the ground wire and the 3rd pin of the second terminal 62 through the calibration unit, so that the power of the transmitting tube in the turbidity sensor 52 is corrected through the calibration unit, thereby improving the detection accuracy of the turbidity sensor. In the embodiment, the calibration unit comprises an operational amplifier U2, an amplification regulating tube TR3 and a sampling resistor R8, the 5th pin of the main controller MCU is connected with the non-inverting input terminal of the operational amplifier U2, the inverting input terminal of the operational amplifier U2 is connected with the ground wire through the sampling resistor R8, the output terminal of the operational amplifier U2 is connected with the base of the amplification regulating tube TR3, the emitter of the amplification regulating tube TR3 is connected with the sampling resistor R8, and the collector of the amplification regulating tube TR3 is connected with the 3rd pin of the second terminal 62. In addition, the calibration unit further comprises a filter, the filter comprises the capacitor C3 and the capacitor C4 arranged in parallel, and the 5th pin of the main controller MCU is connected with the non-inverting input terminal of the operational amplifier U2 through the filter.

[0055] The reference voltage value V1 (V1 is less than 2.5V) at the turbidity-Receiver is set after the receiving tube of the turbidity sensor 52 is turned on, the TR2 outputs 5V to supply power to the turbidity sensor 52, and whether the voltage value at the turbidity-Receiver reaches the V1 value is detected. If not, the PWM duty cycle output by the turbidity P-PWM is compared with the current output of the amplification regulating tube TR3 through the U2 operational amplifier to correct the power of the transmitting tube of the turbidity sensor 52, the light intensity received by the receiving tube is changed, the voltage at the turbidity-Receiver reaches the reference voltage value, and the calibration purpose is achieved.

[0056] The specific structure of the oil cup device will be described below. Figures 1-9

[0057] Referring to Figures 1-4 , the oil cup device comprises an oil cup assembly 1, a switch assembly 2 and a heating assembly 3. The oil cup assembly 1 is provided with an oil collecting groove 11 which is open upward. An oil outlet 12 which is in communication with the oil collecting groove 11 is formed at the bottom or the lower end of the outer side wall of the oil cup assembly 1. The oil outlet 12 is in communication with a sewer or a special sewage tank through an oil guide pipe 10, so that the medium (such as oil stains or cleaning water) in the oil cup assembly can be discharged in time through the oil guide pipe 10. In addition, a clamping portion 13 is arranged at the upper end of each of the left and right side walls of the oil cup assembly 1. The clamping portion 13 is used for cooperating with a hook in the extractor hood to be clamped, so that the oil cup device can be stably and reliably detachably installed at the bottom of the main body 6 of the extractor hood. The switch assembly 2 is arranged on the oil cup assembly 1 and is used for opening or closing the oil outlet 12, so as to automatically control whether the oil cup assembly automatically discharges oil. The heating assembly 3 is arranged on the oil cup assembly 1 and is used for heating the medium in the oil collecting groove 11.

[0058] ​When the oil dirt solidifies in the oil collecting groove 11 of the oil cup assembly 1 and reaches a certain amount, the main controller MCU controls the heating assembly 3 to work through the heating driving circuit 71, and melts the solid oil dirt in the oil collecting groove 11. When the temperature of the oil dirt reaches the set temperature, the solid oil dirt in the oil cup assembly 1 is melted into liquid. At this time, the main controller MCU controls the switch assembly 2 to open the oil outlet 12, and the liquid oil dirt in the oil cup assembly can be automatically discharged through the oil outlet and the oil guide pipe 10 in turn. When the oil dirt is discharged, the switch assembly 2 closes the oil outlet 12. Before, during or after the switch assembly 2 opens the oil outlet, the heating assembly is closed to stop heating. As can be seen, without disassembling the oil cup assembly 1, the purpose of automatically discharging the oil dirt and simply cleaning the oil cup assembly 1 can be achieved.

[0059] Specifically, the bottom surface of the oil collecting groove 11 is arranged with one end high and the other end low. The oil outlet 12 is arranged at the low end of the oil collecting groove 11 corresponding to the bottom of the oil cup assembly 1, so that the oil dirt in the oil collecting groove 11 can automatically flow to the oil outlet 12. In addition, the bottom surface of the oil collecting groove 11 is provided with an annular inclined surface 111 around the oil outlet 12. The annular inclined surface is in a flared structure with a small lower end and a large upper end, so as to better guide the medium to the oil outlet.

[0060] Reference Figures 1-6 The switch assembly 2 includes a fixed seat 21 and a control valve 22. The fixed seat 21 is arranged in the oil collecting groove 11 and connected with the oil cup assembly 1. The fixed seat 21 is arranged above the oil outlet 12 and located at the top of the oil cup assembly 1 and the bottom surface of the oil collecting groove 11. A flow channel for the medium to pass through is formed between the bottom of the fixed seat 21 and the bottom surface of the oil collecting groove 11, so as to avoid affecting the flow of the medium in the oil collecting groove due to the arrangement of the fixed seat 21. The control valve 22 is detachably installed on the fixed seat 21 and is provided with a valve core assembly 221 extending towards the oil outlet 12. The valve core assembly 221 is used to open or close the oil outlet 12.

[0061] Specifically, the front and rear ends of the fixed seat 21 are detachably connected with the front and rear side walls of the oil cup assembly 1. In this embodiment, a plurality of mounting portions are arranged at the front and rear ends of the fixed seat 21. The mounting portion at the front end of the fixed seat 21 is detachably connected with the front side wall of the oil cup assembly 1 through screws, and the mounting portion at the rear end of the fixed seat 21 is detachably connected with the rear side wall of the oil cup assembly 1 through screws, so as to fix the fixed seat on the oil cup assembly.

[0062] Specifically, an upper concave cavity 211 extending downward and opening upward is concavely arranged on the top of the fixed seat 21 corresponding to the position of the oil outlet 12, an opening hole 2111 for the valve core assembly 221 to pass through is arranged on the cavity bottom surface of the upper concave cavity 211, the control valve 22 is arranged in the upper concave cavity 211 and connected with the fixed seat 21, and in the embodiment, the top of the control valve 22 is lower than the top of the oil cup assembly 1, and the valve core assembly 221 vertically passes through the opening hole 2111. Thus, by concavely arranging the upper concave cavity 211 on the top of the fixed seat 21 and arranging the control valve 22 in the upper concave cavity 211, on one hand, the length of the valve core assembly 221 is shortened, and the cost is reduced, and on the other hand, the installation height of the control valve 22 is reduced, and the installation and fixation of the oil cup assembly 1 are not interfered by the arrangement of the switch assembly 2.

[0063] Reference Figures 1-4 A lower concave cavity 14 extending upward and opening downward is concavely arranged on the bottom of the oil cup assembly 1. The heating assembly 3 includes a heating film 31 or a heating pipe, the heating film 31 or the heating pipe is embedded in the lower concave cavity 14 and fitted with the top cavity wall of the lower concave cavity 14, and is used for heating the medium in the oil collecting groove 11. In the embodiment, the heating film 31 or the heating pipe is adhesively fixed with the top cavity wall of the lower concave cavity 14. Specifically, the length of the lower concave cavity 14 and the length of the heating film 31 (or the heating pipe) are both greater than 1 / 2 of the length of the bottom of the oil cup assembly 1, and in the embodiment, the lower concave cavity 14 and the heating film 31 both extend from the end of the bottom of the oil cup assembly 1 away from the oil outlet to the direction of the oil outlet 12 and close to the oil outlet, so that the lower concave cavity 14 and the heating film 31 (or the heating pipe) have a larger length, which is beneficial to increase the heating area and improve the heating efficiency.

[0064] The heating assembly 3 further includes a cover plate 32 arranged at the bottom of the heating film 31 or the heating pipe and connected with the oil cup assembly 1. In the embodiment, the cover plate 32 can be adhesively or weldingly fixedly connected with the oil cup assembly 1, or can be screwingly or bucklingly detachably connected and fixed, so as to hide the heating film 31 or the heating pipe between the cover plate 32 and the oil cup assembly 1, thereby making the product safer and more reliable.

[0065] Reference Figures 1-6The oil cup device further comprises a first wiring terminal 4 mounted on the fixed seat 21 of the switch assembly 2 and electrically connected with the switch assembly 2 and the heating assembly 3 respectively, so as to integrate the mating sockets of the switch assembly 2 and the heating assembly 3 on the same first wiring terminal 4, thereby making the power connection and disassembly of the oil cup device more convenient. Specifically, a boss 212 extending upward is protruded at the position of the fixed seat 21 corresponding to the first wiring terminal 4, and the first wiring terminal 4 is arranged on the top of the boss 212 and detachably connected with the boss 212. In the embodiment, the boss 212 is integrally punched and formed upward from the local part of the fixed seat 21, and two fixed columns 2121 are integrally formed inside the boss 212, and a through hole is arranged at the position of the boss 212 corresponding to the fixed columns 2121, which penetrates the bottom of the fixed columns 2121 and the top of the boss 212 respectively. When fixed, a screw is vertically arranged from top to bottom in the first wiring terminal 4 and the through hole and fastened with the fixed columns, so as to realize the fixed installation of the first wiring terminal 4 on the fixed seat 21 by the screw.

[0066] With reference to Figures 1-3 In the embodiment, the first wiring terminal 4 is connected with the control valve 22 in the switch assembly 2 through the switch connecting line 41, and the first wiring terminal 4 is connected with the heating film 31 or the heating pipe in the heating assembly 3 through the heating connecting line 42. Specifically, the top cavity wall or the side cavity wall of the lower cavity 14 near one end of the first wiring terminal 4 is provided with a wire passing port 141, the lower cavity 14 is connected with the oil collecting groove through the wire passing port 141, and the heating connecting line 42 is arranged in the wire passing port 141 and connected with the first wiring terminal 4 and the heating film 31 or the heating pipe in the heating assembly 3 at both ends. In addition, a sealing glue 16 for sealing the wire passing port is additionally arranged at the wire passing port 141, so as to prevent oil leakage at the wire passing port 141 and avoid the medium in the oil collecting groove from entering the lower cavity 14 through the wire passing port 141 to pollute or damage the heating assembly.

[0067] With reference to Figures 1-6Further, the oil cup device further comprises a detection assembly electrically connected with the first wiring terminal 4, the detection assembly comprising a temperature sensor 51 and / or a turbidity sensor 52, the temperature sensor 51 being arranged on the switch assembly 2 or the oil cup assembly 1 and used for detecting the temperature of the medium in the oil collecting groove 11, according to the detected temperature of the medium, it can be determined whether the heating assembly 3 stops working and whether the switch assembly 2 opens the oil outlet 12. The turbidity sensor 52 is arranged on the switch assembly 2 or the oil cup assembly 1 and used for detecting whether the medium in the oil collecting groove 11 reaches a set position, that is, detecting whether the oil cup assembly 1 is full of oil, according to the detection result, it can be determined whether the oil needs to be discharged and further determined whether the heating assembly needs to be started. In the embodiment, the turbidity sensor 52 comprises oppositely arranged emitting tubes and receiving tubes, according to the signal received by the receiving tubes from the emitting tubes, it can be determined whether the oil cup assembly 1 is full of oil. In other embodiments, the turbidity sensor 52 can be omitted, at this time, a visible window needs to be additionally arranged on the front side wall of the oil cup assembly 1, so as to check whether the oil cup assembly is full of oil through the visible window; the temperature sensor can also be omitted, at this time, according to the heating time, it can be controlled whether the heating assembly stops heating, or according to the change of the medium liquid level in the oil cup assembly, it can be determined whether the heating assembly stops heating.

[0068] Specifically, the temperature sensor 51 is arranged in the oil collecting groove and fixedly connected with the fixed seat 21 in the switch assembly 2. The turbidity sensor 52 is arranged in the oil collecting groove 11 and located between the heating assembly 3 and the oil outlet, a sunken table 15 opening upward is recessed on the bottom surface of the oil collecting groove 11, the turbidity sensor 52 is arranged in the sunken table 15 and adhesively connected with the oil cup assembly 1.

[0069] In the embodiment, the first wiring terminal 4 is electrically connected with the temperature sensor 51 through the temperature measuring connecting line 43 and electrically connected with the turbidity sensor 52 through the turbidity connecting line 44, so that the butt joint socket of the detection assembly is also integrated on the same first wiring terminal 4, which facilitates the power connection and disassembly of the oil cup device. Specifically, the temperature sensor 51 is installed at the bottom of the fixed seat 21, a wire passing hole 213 is formed on the fixed seat 21 and arranged close to the first wiring terminal 4, the temperature measuring connecting line 43 passes through the wire passing hole 213 and is connected with the temperature sensor 51 and the first wiring terminal 4 at both ends respectively.

[0070] The above only describes some embodiments of the present application. For those skilled in the art, without departing from the inventive concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application.

Claims

1. A control circuit for a range hood, characterized in that, The oil fume extractor includes a fume extractor body (6) and an oil cup device, the fume extractor body (6) is provided with an oil outlet (61) and a second terminal (62) at the bottom, the oil cup device is detachably installed at the bottom of the fume extractor body (6), the oil cup device is provided with an oil collecting groove (11), a heating assembly (3) and a first terminal (4), the oil collecting groove (11) is connected with the oil outlet (61), the heating assembly (3) is connected with the first terminal (4), and the first terminal (4) is selectively connected with the second terminal (62); The control circuit includes a heating drive circuit (71) and a main controller MCU (72), the heating drive circuit (71) is used for controlling the working state of the heating assembly (3), and the main controller MCU (72) is connected with the heating drive circuit (71) and the second terminal (62) respectively.

2. A control circuit for a range hood as defined in claim 1, wherein The heating drive circuit (71) includes a first switch unit (711), a first control unit (712) and a second control unit (713), the first end of the first switch unit (711) is connected with an ACL, the second end is connected with the fifth pin of the first terminal (4), the third end is connected with a ground wire and the fourth pin of the main controller MCU (72) through the second control unit (713) respectively, and the fourth end is connected with the ground wire, a power supply and the twentieth pin of the main controller MCU (72) through the first control unit (712) respectively. The heating drive circuit (71) further includes a second switch unit (714) and a third control unit (715), the first end of the second switch unit (714) is connected with an ACN, the second end is connected with the sixth pin of the second terminal (62), and the third end is connected with the ground wire and the fourth pin of the main controller MCU (72) through the third control unit (715) respectively.

3. A control circuit for a range hood as defined in claim 2, wherein The first switch unit (711) includes a relay REL1, a diode D6 and an electrolytic capacitor EC1, the diode D6 is connected with the coil of the relay REL1 in parallel, the cathode of the diode D6 is connected with a power supply, the anode of the diode D6 is connected with the fourth pin of the main controller MCU (72) and the ground wire through the second control unit (713), the first contact of the relay REL1 is connected with an ACL, the second contact is connected with the fifth pin of the first terminal (4), and the electrolytic capacitor EC1 is connected with the diode D6 in parallel. The first control unit (712) includes a triode Q1 and a MOS tube TR2, the emitter of the triode Q1 is connected with a ground wire, the base is connected with the twentieth pin of the main controller MCU (72), the collector is connected with the gate of the MOS tube TR2, the source of the MOS tube TR2 is connected with a power supply, and the drain of the MOS tube TR2 is connected with the ground wire, the positive electrode of the electrolytic capacitor EC1 and the fourth contact of the relay REL1 respectively. The second control unit (713) comprises a transistor Q2, the emitter of the transistor Q2 is connected to the ground, the base is connected to the 4th pin of the main controller MCU (72), and the collector is connected to the third contact of the relay REL1.

4. A control circuit for a range hood as defined in claim 3, wherein The second control unit (713) further comprises a capacitor C11 and a resistor R19, and the base of the transistor Q2 is connected to the 4th pin of the main controller MCU (72) through the resistor R19 and the capacitor C11 in sequence.

5. The control circuit for a range hood according to claim 2, wherein The second switch unit (714) comprises a relay REL2, a diode D7 and an electrolytic capacitor EC2, the diode D7 is connected in parallel with the coil of the relay REL2, the cathode of the diode D7 is connected to the power supply, the anode is connected to the 4th pin of the main controller MCU (72) and the ground through the third control unit (715), the first contact of the relay REL2 is connected to the zero line ACN, the second contact is connected to the 6th pin of the first terminal (4), and the electrolytic capacitor EC2 is connected in parallel with the diode D7. The third control unit (715) comprises a transistor Q3, the emitter of the transistor Q3 is connected to the ground, the base is connected to the 4th pin of the main controller MCU (72), and the collector is connected to the third contact of the relay REL2.

6. A control circuit for a range hood as defined in claim 5, wherein The third control unit (715) further comprises a capacitor C12 and a resistor R20, and the base of the transistor Q3 is connected to the 4th pin of the main controller MCU (72) through the resistor R20 and the capacitor C12 in sequence.

7. A control circuit for a range hood according to any one of claims 2 to 6, wherein The heating driving circuit (71) further comprises a current conversion unit (716) and a rectifier unit (717), and the 20th pin of the main controller MCU (72) is connected to the first control unit (712) through the current conversion unit (716) and the rectifier unit (717) in sequence.

8. The control circuit for a range hood according to claim 1, wherein The control circuit further comprises an on-off detection circuit (73) connected to the main controller MCU (72) for detecting whether the second terminal (62) is connected to the first terminal (4).

9. A control circuit for a range hood according to claim 1 or 8, wherein The oil cup device is further provided with an oil outlet (12) and a switch assembly (2), the oil outlet (12) is connected to the oil collecting groove (11), and the switch assembly (2) is connected to the first terminal (4). The control circuit further comprises a switch driving circuit (74) connected to the main controller MCU (72) for driving the switch assembly (2) to open or close the oil outlet (12).

10. The control circuit for a range hood according to claim 1 or 8, wherein The oil cup device is further provided with a temperature sensor (51) and / or a turbidity sensor (52) connected to the first terminal (4). The control circuit further comprises a temperature detection circuit (75) connected with the main controller MCU (72) for detecting the medium temperature in the oil collecting groove (11), and / or a turbidity detection circuit (76) connected with the main controller MCU (72) for detecting whether the medium in the oil collecting groove (11) reaches a set position.

11. A control circuit for a range hood as defined in claim 10, wherein The turbidity detection circuit (76) comprises a voltage dividing unit, a resistor R4 and a capacitor C1, the 6th pin of the main controller MCU (72) is connected with ground and the 2nd pin of the second terminal (62) through the voltage dividing unit respectively, the 1st pin of the second terminal (62) is connected with ground through the capacitor C1, and the resistor R4 is connected with the voltage dividing unit in parallel and with ground.

12. A control circuit for a range hood as defined in claim 11, wherein The turbidity detection circuit (76) further comprises a calibration unit, the calibration unit comprises an operational amplifier U2, an amplification adjusting tube TR3 and a sampling resistor R8, the 5th pin of the main controller MCU (72) is connected with the non-inverting input terminal of the operational amplifier U2, the inverting input terminal of the operational amplifier U2 is connected with ground through the sampling resistor R8, the output terminal of the operational amplifier U2 is connected with the base of the amplification adjusting tube TR3, the emitter of the amplification adjusting tube TR3 is connected with the sampling resistor R8, and the collector of the amplification adjusting tube TR3 is connected with the 3rd pin of the second terminal (62).

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