Range hood self-cleaning device and method

Abstract

The present invention relates to a range hood self-cleaning device and method thereof, comprising a motor for driving an impeller, a control circuit for controlling the forward and reverse rotation of the motor, and a controller for sending a forward signal, a reverse signal, and then a stop signal to the control circuit to drive the motor for rapid braking. When the motor is running in a fast forward rotation, the controller sends a reverse signal and then sends a stop signal within 2 seconds. The motor implements a reverse operation procedure due to receiving the reverse signal, thereby offsetting the inertia of the motor's forward rotation, causing the motor to drive the impeller to drop sharply, allowing the oil to separate from the blades and enter the oil collection device under the principle of running inertia, thereby achieving the purpose of self-cleaning. Such self-cleaning processing has low cost, convenient operation, and reliable operation.

Description

Technical Field

[0001] The invention relates to a range hood self-cleaning device and a method thereof. Background Art

[0002] In the prior art, the cleaning of the interior of the range hood is mainly focused on cleaning the turbine and blades. There are two common methods: one is to add a heating tube to the volute to increase the oil temperature in the volute so that it is easier to separate from the impeller; the other is to add water cleaning, that is, use a pump to spray water on the impeller to rinse the impeller. These two methods have a certain cleaning effect, but they also have the following problems: (1) the oil on the back of the blade cannot be completely removed; (2) the cost increases too much; (3) water cleaning requires regular water addition.

[0003] The motors currently used in range hoods are generally driven by single-phase AC motors or brushless DC motors. The internal windings are generally connected in a T-type manner, which cannot be braked suddenly, and the motor speed is controlled by a tap method, generally achieving 3-4 speeds. As mentioned above, the existing automatic cleaning methods are not satisfactory. Designing a low-cost, easy-to-operate automatic cleaning device and corresponding methods is an urgent problem to be solved in this field. .

[0004] The Chinese invention patent with application number CN201710569711.4 provides a self-cleaning range hood, including a main fan, an air outlet hood arranged at the air outlet of the main fan, and a self-cleaning device, wherein the main fan includes a volute and an impeller arranged in the volute, and the self-cleaning device includes a spray mechanism for discharging washing liquid into the volute, characterized in that: the self-cleaning device also includes a blower mechanism for blowing the washing liquid sprayed into the volute toward the impeller, and the blower mechanism includes an air duct connected to the air outlet hood, and a nozzle connected to the air duct and the bottom of the volute, respectively. By providing a spray mechanism and a blower mechanism, the washing liquid discharged by the spray mechanism is blown onto the blades of the impeller, so that the washing liquid can cover the range of the blades as low as possible, thereby improving the cleaning effect, and the airflow of the air outlet hood is used for blowing, so that the internal circulation of the range hood is realized without a water pump.

[0005] The above patent sprays the washing liquid and then blows the washing liquid onto the blades of the impeller, which adds a spray mechanism, a fan and an air supply structure related to the fan. The structure is complicated, the cost is increased too much, and the washing liquid needs to be added regularly, and the oil stains on the back of the blades cannot be completely removed. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a range hood self-cleaning device and method thereof, which has low processing cost, convenient operation and reliable operation.

[0007] The main technical solution of a range hood self-cleaning device provided by the present invention is:

[0008] It includes a motor for driving an impeller, a control circuit for controlling the forward and reverse rotation of the motor, and a controller for sending a forward rotation signal, a reverse rotation signal, and then a stop signal to the control circuit to drive the motor for rapid braking.

[0009] Wherein, the motor is a unidirectional AC motor, comprising a first winding, a second winding, a starting capacitor and a speed regulating winding unit;

[0010] When the controller sends a forward signal, one end of the first winding is connected to the live wire, the other end of the first winding is connected to one end of the starting capacitor, the other end of the starting capacitor is connected to the neutral wire, one end of the second winding is connected to the live wire through the speed regulating winding unit, and the other end of the second winding is connected to the neutral wire;

[0011] When the controller sends a reverse signal, one end of the second winding is connected to the live wire, the other end of the second winding is connected to one end of the starting capacitor, the other end of the starting capacitor is connected to the neutral wire, one end of the first winding is connected to the live wire through the speed regulating winding unit, and the other end of the first winding is connected to the neutral wire.

[0012] Wherein, the controller includes a self-washing operation switch, which is a double-throw switch, including a first control end and a second control end; when the first control end is connected, a forward signal is sent to the motor, and when the second control end is connected, a reverse signal is sent to the motor; an automatic stop device is arranged in the second control end.

[0013] Wherein, the speed regulating winding unit includes at least two sub-windings with different numbers of coil turns, and the controller also includes a speed regulating switch, and the sub-windings of the speed regulating winding unit are respectively connected to corresponding buttons on the speed regulating switch.

[0014] Among them, it also includes an electronic switch panel, and the electronic switch panel includes a self-cleaning button that sends a self-cleaning signal to the controller;

[0015] When the motor is running, the self-cleaning button is triggered, and the self-cleaning button sends a self-cleaning command to the controller. The controller outputs a reverse signal to the control circuit to drive the motor to brake rapidly. The controller outputs a stop signal to the control circuit to drive the motor to stop running within an interval of less than 2 seconds.

[0016] When the motor is not running, the self-cleaning button is triggered, which sends a self-cleaning command to the controller. The controller outputs a forward signal to the control circuit to drive the motor to rotate forward. When the interval is greater than 2 seconds, a reverse command is sent to the controller again, and the controller outputs a reverse signal to the control circuit to drive the motor to brake rapidly. When the interval is less than 2 seconds, the controller outputs a stop signal to the control circuit to drive the motor to stop running.

[0017] Among them, the speed regulation winding unit includes at least two sub-windings with different numbers of coil turns, and the electronic switch panel also includes wind speed keys corresponding to the sub-windings. The sub-windings of the speed regulation winding unit are respectively connected to the corresponding wind speed keys through drivers, and the driver includes a relay and a transistor.

[0018] Wherein, the motor is a variable frequency motor, whose three-phase running winding is connected to the output end of the controller through a PWM drive circuit, and the variable frequency motor is connected to a microprocessor chip;

[0019] When the controller sends a forward signal to the motor, the PWM drive circuit drives the running windings W, V, and U in the motor to operate in a predetermined phase sequence;

[0020] When the controller sends a reverse signal to the motor, the microprocessor chip changes the phase sequence of W and V, V and U, or U and W.

[0021] The main technical solution of a range hood self-cleaning method provided by the present invention comprises the following steps:

[0022] (1) Calculate the forward rotation time of the motor. If the forward rotation time reaches the preset value of the self-cleaning forward rotation time, start the subsequent steps. If the forward rotation time does not reach the preset value of the self-cleaning forward rotation time, continue timing;

[0023] (2) Sending a reverse operation signal to the motor through a switching operation;

[0024] (3) Calculate the time length that the motor receives the reverse signal. If the time length that the self-cleaning preset receives the reverse signal is reached, start the subsequent steps. If the time length that the self-cleaning preset receives the reverse signal is not reached, continue timing;

[0025] (4) A stop signal is sent to the motor and the running time is reset.

[0026] Among them, the preset forward rotation time value is greater than 2 seconds, and the preset duration of receiving the reverse rotation signal is less than 2 seconds.

[0027] Wherein, before step (1), the method further includes the following steps:

[0028] Receive the command to start self-cleaning, detect whether the motor is rotating forward, if the motor is rotating forward, skip step (1) and directly run step (2), and reset the running time; if the motor is not running, send a forward signal to the motor first, and then run steps (1) to (4).

[0029] With the range hood self-cleaning device and method provided by the present invention, when the motor is running in a fast forward rotation, the controller sends a reverse signal and then sends a stop signal within 2 seconds. The motor implements a reverse operation procedure due to receiving the reverse signal, thereby offsetting the inertia of the motor's forward rotation, causing the motor to drive the impeller to drop sharply, allowing the oil to separate from the blades and enter the oil collection device under the principle of running inertia, thereby achieving the purpose of self-cleaning. In this way, the self-cleaning process has low processing cost, convenient operation, and reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A circuit control schematic diagram of a range hood self-cleaning device according to an embodiment of the present invention using a single-phase AC motor for self-cleaning;

[0031] Figure 2 A structural diagram of a self-cleaning operation switch of a range hood self-cleaning device according to Embodiment 1 of the present invention;

[0032] Figure 3 This is a structural diagram of a speed regulating switch of a range hood self-cleaning device according to Embodiment 1 of the present invention;

[0033] Figure 4 This is a schematic diagram of a control circuit of a single-phase AC motor used in a self-cleaning device for a range hood according to a second embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the electronic control circuit control of a motor device using a variable frequency motor in a range hood self-cleaning device according to Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below in conjunction with embodiments and drawings. It should be pointed out that the described embodiments are only intended to facilitate the understanding of the present invention and do not have any limiting effect on the present invention.

[0036] Embodiment 1

[0037] This embodiment uses a mechanical switch to control the rapid braking of a single-phase AC motor. Figure 1-3 As shown, according to this embodiment, a range hood self-cleaning device is provided, including a motor for driving an impeller, a control circuit for controlling the forward or reverse rotation of the motor, and a controller 1 for sending a forward signal, a reverse signal, and then a stop signal to the control circuit to drive the motor to perform rapid braking and thereby drive the impeller for centrifugal self-cleaning.

[0038] The motor of this embodiment is a unidirectional AC motor, including a first winding R1, a second winding R2, a starting capacitor C and a speed regulating winding unit (L1, L2, L3). When the controller sends a forward rotation signal, one end of the first winding R1 is connected to the live wire, the other end of the first winding R1 is connected to one end of the starting capacitor C, and the other end of the starting capacitor C is connected to the N2 end of the neutral wire; one end of the second winding R2 is connected to the live wire through the speed regulating winding unit (L1, L2, L3), the other end of the second winding R2 is connected to the N2 end of the neutral wire, and the N1 end of the neutral wire is not connected.

[0039] When the controller sends a reversal signal, one end of the second winding R2 is connected to the live wire, the other end of the second winding R2 is connected to one end of the starting capacitor C, another end of the starting capacitor C is connected to the N1 end of the neutral line, one end of the first winding R1 is connected to the live wire through the speed regulating winding unit (L1, L2, L3), the other end of the first winding R1 is connected to the N1 end of the neutral line, and the N2 end of the neutral line is not connected.

[0040] The controller includes a self-washing operation switch. The self-washing operation switch is a double-throw switch, including a first control end and a second control end. When the first control end is connected and the second control end is not connected, a forward signal is sent to the motor, and when the second control end is connected and the first control end is not connected, a reverse signal is sent to the motor. An automatic stop device is provided in the second control end, and the self-washing operation switch will automatically stop when the second control end is connected.

[0041] Preferably, if Figure 2 As shown, the self-washing operation switch is a rocker switch. When the A button in the rocker switch is pressed, N-N2 is connected, and the motor is supplied with forward voltage. When the B button in the rocker switch is pressed, N-N1 is connected, and the motor is supplied with reverse voltage, and the single-phase AC motor is braked urgently. The B button contains a spring-like telescopic part, which can reset itself unilaterally. After the pressure on the button B is released, the button B automatically rebounds, and N-N1 and N-N2 are disconnected, and the motor neither reverses nor rotates forward.

[0042] The speed regulating winding unit comprises at least two sub-windings (R3, R4) with different numbers of coil turns, and the controller further comprises a speed regulating switch, wherein the sub-windings (R3, R4) of the speed regulating winding unit are respectively connected to corresponding buttons on the speed regulating switch, and the motor speed is regulated by pressing the buttons.

[0043] In this way, when the motor is running forward quickly, the controller sends a reverse signal and then sends a stop signal within 2 seconds. The motor receives the reverse signal and implements the reverse operation procedure, thereby offsetting the inertia of the motor's forward rotation, causing the motor to drive the impeller speed to drop sharply, allowing the oil to separate from the blades and enter the oil collection device under the principle of running inertia, thereby achieving the purpose of self-cleaning. This self-cleaning process has low cost, convenient operation, and reliable operation.

[0044] Embodiment 2

[0045] This embodiment uses electronically controlled single-phase AC motor rapid braking, such as Figure 4 As shown, according to this embodiment, a range hood self-cleaning device is provided, which also includes a motor for driving an impeller, a control circuit for controlling the forward or reverse rotation of the motor, and a controller 1 for sending a forward rotation signal, a reverse rotation signal, and then a stop signal to the control circuit to drive the motor to perform rapid braking and then drive the impeller for centrifugal self-cleaning. The motor is a unidirectional AC motor, including a first winding R1, a second winding R2, a starting capacitor C, and a speed regulating winding unit (L1, L2, L3).

[0046] It also includes an electronic switch panel, which includes a self-cleaning button that sends a self-cleaning instruction to the controller, and then the controller sends a forward signal, a reverse signal, and then a stop signal to the control circuit to drive the motor for rapid braking. When the motor is running, the self-cleaning button is triggered, and the self-cleaning button sends a self-cleaning instruction to the controller. The controller outputs a reverse signal to the control circuit to drive the motor for rapid braking. The controller outputs a stop signal to the control circuit to drive the motor to stop running if the interval is less than 2 seconds. When the motor is not running, the self-cleaning button is triggered, and the self-cleaning button sends a self-cleaning instruction to the controller. The forward signal output by the controller drives the motor to rotate forward; the reverse command is sent to the controller again after an interval greater than 2 seconds, and the controller outputs a reverse signal to the control circuit to drive the motor for rapid braking. The controller outputs a stop signal to the control circuit to drive the motor to stop running if the interval is less than 2 seconds.

[0047] The speed regulating winding unit includes at least two sub-windings with different numbers of coil turns, and the electronic switch panel also includes wind speed keys corresponding to the sub-windings. The sub-windings of the speed regulating winding unit are connected to the corresponding wind speed keys through drivers, and the driver includes relays and triodes. Among them, one or more MOS tubes or thyristors can also be used to replace the relays.

[0048] Preferably, the speed regulating winding unit includes three sub-speed regulating winding units L1, L2 and L3. If the range hood is to work in high gear, the chip program of the controller allows the PA1 pin to output a high level, drives the Q1 transistor to conduct, and then makes the K1 relay energized, and the motor running winding L1 end is connected to the live wire L. If the range hood is to work in medium gear, the chip program of the controller allows the PA2 pin to output a high level, drives the Q2 transistor to conduct, and then makes the K2 relay energized, and the motor running winding L2 end is connected to the live wire L. If the range hood is to work in low gear, the chip program of the controller allows the PA3 pin to output a high level, drives the Q3 transistor to conduct, and then makes the K3 relay energized, and the motor running winding L3 end is connected to the live wire L.

[0049] The range hood self-cleaning method comprises the following steps: (1) calculating the forward rotation time of the motor, and starting the subsequent steps if the forward rotation time reaches the preset value of the self-cleaning forward rotation time, and continuing the timing if the forward rotation time does not reach the preset value of the self-cleaning forward rotation time; (2) sending a reverse operation signal to the motor through a switching operation; (3) calculating the time when the motor receives the reverse rotation signal, and starting the subsequent steps if the reverse rotation time reaches the preset value of the self-cleaning reverse rotation time, and continuing the timing if the reverse rotation time does not reach the preset value of the self-cleaning reverse rotation time; (4) sending a stop signal to the motor to reset the running time.

[0050] To ensure reliable operation, the preset forward rotation time value is greater than 2 seconds, and the preset duration of receiving the reverse rotation signal is less than 2 seconds.

[0051] Among them, before step (1), the method also includes the following steps: receiving a command to start self-cleaning, detecting whether the motor is rotating forward, and if the motor is rotating forward, skipping step (1) and directly running step (2), and resetting the running time; if the motor is not running, first sending a forward signal to the motor, and then running steps (1) to (4).

[0052] Regardless of whether the motor is running in strong, medium or weak gear, the chip program will make the PA4 pin output low level, the Q4 transistor will be turned off, the K4 relay will not be attracted, and the b normally closed end will be connected to the motor winding N2 end and the neutral line N. When the single-phase AC motor is running in forward rotation, the self-cleaning key is triggered. At this time, the chip program will make the PA4 pin output high level, the Q4 transistor will be turned on, the K4 relay will be attracted, and the c normally open end will be closed and connected to the motor winding N1 end and the neutral line N. At this time, the motor is reversed. Voltage, within 2 seconds, the PA1 pin outputs a low level, and the single-phase AC motor is braked urgently.

[0053] In this way, when the motor is running forward quickly, the controller sends a reverse signal and then sends a stop signal within 2 seconds. The motor receives the reverse signal and implements the reverse operation procedure, thereby offsetting the inertia of the motor's forward rotation, causing the motor to drive the impeller speed to drop sharply, allowing the oil to separate from the blades and enter the oil collection device under the principle of running inertia, thereby achieving the purpose of self-cleaning. This self-cleaning process has low cost, convenient operation, and reliable operation.

[0054] Embodiment 3

[0055] like Figure 5 As shown, this embodiment adopts a variable frequency motor. According to this embodiment, a range hood self-cleaning device is provided, which also includes a motor for driving an impeller, a control circuit for controlling the forward or reverse rotation of the motor, and a controller 1 for sending a forward signal, a reverse signal, and then a stop signal to the control circuit to drive the motor to perform rapid braking and thereby drive the impeller for centrifugal self-cleaning.

[0056] The motor is a variable frequency motor, and its three-phase running winding is connected to the output end of the controller through a PWM drive circuit. The variable frequency motor is connected to a microprocessor chip. When the controller sends a forward signal to the motor, the PWM drive circuit drives the running windings W, V, and U in the motor to operate in a predetermined phase sequence. When the controller sends a reverse signal to the motor, the microprocessor chip changes the phase sequence of W and V, V and U, or U and W.

[0057] Variable frequency motor DC or AC type, electronically controlled speed regulation, emergency brake oil dumping. Based on GD32F130Cx control chip, with high performance, integrated with three independent half-bridge gate drive integrated electronic chips FD6536. Obtain variable frequency AC power supply to control AC motor variable frequency speed regulation.

[0058] Diodes DU5 / DV5 / DW5 and CU5 / CV5 / CW5 are bootstrap diodes and bootstrap capacitors. Together with the gate drive integrated electronic chip FD6536, high and low-end IGBTs Q51Q52, Q53Q54, Q55Q56 complete the charging and discharging process, thus realizing a PWM cycle.

[0059] R11R21, R12R22, R13R23, R14R24, R15R25, and R16R26 are the gate bias circuit of the IGBT. When the voltage between the gate (G) and the source (S) is greater than the threshold of the IGBT, preferably, the threshold is 10 to 15V, the IGBT is fully turned on.

[0060] In this way, when the variable frequency motor is running in fast forward rotation, the controller sends a reverse signal and then sends a stop signal within 2 seconds. The motor implements the reverse operation procedure due to receiving the reverse signal, thereby offsetting the inertia of the motor's forward rotation, causing the motor to drive the impeller speed to drop sharply, allowing the oil to separate from the blades and enter the oil collection device under the principle of running inertia, thereby achieving the purpose of self-cleaning. This self-cleaning process has low cost, convenient operation, and reliable operation.

[0061] The above-described embodiment is only one of the more preferred specific implementations of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A range hood self-cleaning device, characterized in that: It includes a motor for driving an impeller, a control circuit for controlling the forward and reverse rotation of the motor, and a controller for sending a forward rotation signal, a reverse rotation signal, and then sending a stop signal to the control circuit within 2 seconds to drive the motor to perform rapid braking; the motor is a unidirectional AC motor, including a first winding, a second winding, a starting capacitor and a speed regulating winding unit; When the controller sends a forward signal, one end of the first winding is connected to the live wire, the other end of the first winding is connected to one end of the starting capacitor, the other end of the starting capacitor is connected to the neutral wire, one end of the second winding is connected to the live wire through the speed regulating winding unit, and the other end of the second winding is connected to the neutral wire; When the controller sends out a reverse signal, one end of the second winding is connected to the live wire, the other end of the second winding is connected to one end of the starting capacitor, the other end of the starting capacitor is connected to the neutral wire, one end of the first winding is connected to the live wire through the speed regulating winding unit, and the other end of the first winding is connected to the neutral wire; the controller includes a self-cleaning operation switch, which is a double-throw switch, including a first control end and a second control end; when the first control end is turned on, a forward signal is sent to the motor, and when the second control end is turned on, a reverse signal is sent to the motor; the second control end is provided with an automatic stop device; and also includes an electronic switch panel, and the electronic switch panel includes a self-cleaning key that sends a self-cleaning signal to the controller; When the motor is running, the self-cleaning button is triggered, and the self-cleaning button sends a self-cleaning command to the controller. The controller outputs a reverse signal to the control circuit to drive the motor to brake rapidly. The controller outputs a stop signal to the control circuit to drive the motor to stop running within an interval of less than 2 seconds. When the motor is not running, the self-cleaning button is triggered, which sends a self-cleaning command to the controller. The controller outputs a forward signal to the control circuit to drive the motor to rotate forward. When the interval is greater than 2 seconds, a reverse command is sent to the controller again, and the controller outputs a reverse signal to the control circuit to drive the motor to brake rapidly. When the interval is less than 2 seconds, the controller outputs a stop signal to the control circuit to drive the motor to stop running.

2. The range hood self-cleaning device according to claim 1, characterized in that: The speed regulating winding unit includes at least two sub-windings with different numbers of coil turns, and the controller also includes a speed regulating switch. The sub-windings of the speed regulating winding unit are respectively connected to corresponding buttons on the speed regulating switch.

3. The range hood self-cleaning device according to claim 1, characterized in that: The speed regulating winding unit includes at least two sub-windings with different numbers of coil turns, and the electronic switch panel also includes wind speed keys corresponding to the sub-windings. The sub-windings of the speed regulating winding unit are connected to the corresponding wind speed keys through drivers respectively, and the driver includes a relay and a transistor.

4. The range hood self-cleaning device according to claim 1, characterized in that: The motor is a variable frequency motor, whose three-phase running winding is connected to the output end of the controller through a PWM drive circuit, and the variable frequency motor is connected to a microprocessor chip; When the controller sends a forward signal to the motor, the PWM drive circuit drives the running windings W, V, and U in the motor to operate in a predetermined phase sequence; When the controller sends a reverse signal to the motor, the microprocessor chip changes the phase sequence of W and V, V and U, or U and W.

5. A range hood self-cleaning method, characterized in that: The following steps are involved: (1) The controller includes a self-cleaning operation switch, which is a double-throw switch including a first control end; when the first control end is turned on, a forward rotation signal is sent to the motor; when the controller sends the forward rotation signal, one end of the first winding is connected to the live wire, the other end of the first winding is connected to one end of the starting capacitor, the other end of the starting capacitor is connected to the neutral wire, one end of the second winding is connected to the live wire through the speed regulating winding unit, and the other end of the second winding is connected to the neutral wire; the forward rotation time of the motor is calculated, and if the self-cleaning preset forward rotation time value is reached, the subsequent steps are started, and if the self-cleaning preset forward rotation time value is not reached, the timing is continued; (2) The self-washing operation switch also includes a second control end; when the second control end is turned on, a reverse signal is sent to the motor; a reverse operation signal is sent to the motor through a switching operation; when the controller sends a reverse signal, one end of the second winding is connected to the live wire, the other end of the second winding is connected to one end of the starting capacitor, the other end of the starting capacitor is connected to the neutral wire, one end of the first winding is connected to the live wire through the speed regulating winding unit, and the other end of the first winding is connected to the neutral wire; (3) Calculate the time length that the motor receives the reverse signal. If the time length that the self-cleaning preset receives the reverse signal is reached, start the subsequent steps. If the time length that the self-cleaning preset receives the reverse signal is not reached, continue timing; (4) The second control terminal is provided with an automatic stop device, which sends a stop signal to the motor within 2 seconds and resets the running time.

6. A range hood self-cleaning method according to claim 5, characterized in that: The preset forward rotation time value is greater than 2 seconds, and the preset duration of receiving the reverse rotation signal is less than 2 seconds.

7. A range hood self-cleaning method according to claim 5 or 6, characterized in that: The method further comprises the following steps before step (1): Receive the command to start self-cleaning, detect whether the motor is rotating forward, if the motor is rotating forward, skip step (1) and directly run step (2), and reset the running time; if the motor is not running, send a forward signal to the motor first, and then run steps (1) to (4).

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