CN203099948U - Smoke exhaust - Google Patents

Abstract

The utility model provides a range hood, which comprises a main control unit, a motor drive unit and a motor which are sequentially connected; also includes: a noise detection unit connected with the main control unit; The motor noise determines the resonance interval, and adjusts the output to avoid the duty cycle of the resonance interval to the motor drive unit to drive the motor to run with constant torque. From the above, the range hood adjusts the operating frequency of the motor according to the detected motor noise, so as to reduce the noise of the range hood.

Description

range hood

technical field

The utility model relates to a range hood.

Background technique

With the development of technology, the current motor development direction is mainly towards the direction of green, low carbon and low noise, especially the frequency conversion technology has become the trend of the home appliance industry. However, most of the variable frequency motors on the range hood market are AC frequency conversion motors, which cannot satisfy users to choose a suitable speed. It still runs at a relatively high speed, causing a series of problems such as high noise and high energy consumption.

Utility model content

In order to solve the above problems, the utility model provides a range hood, which adjusts the operating frequency of the motor according to the detected motor noise, so as to reduce the noise of the range hood.

The range hood provided by the utility model includes a main control unit, a motor drive unit and a motor connected in sequence; it also includes: a noise detection unit connected with the main control unit;

The main control unit is used to determine the resonance interval according to the motor noise detected by the noise detection unit, and adjust the output to avoid the duty cycle of the resonance interval until the motor drive unit drives the motor to run with constant torque.

From the above, the range hood adjusts the operating frequency of the motor according to the detected motor noise, so as to reduce the noise of the range hood.

Optionally, also include:

The control panel is used to receive the wind speed control command of the fan input by the user;

The motor speed detection unit is connected with the motor;

The main control unit is also respectively connected with the display panel and the motor speed detection unit, and is used for adjusting the duty ratio of the motor speed according to the wind speed control command of the fan and the speed of the motor, and the closed-loop output.

Optionally, the motor speed detection unit is powered by an independent power supply.

From the above, when the range hood is turned off, the motor has not stopped due to inertia and the range hood is turned on again, the motor speed detection unit detects the motor speed in real time and feeds it back to the main control unit, and performs closed-loop adjustment based on the current speed and speed control commands. Realize the smooth start of the motor and reduce the loss of the motor.

Optionally, the control panel is provided with an array of touch keys and corresponding indicator lights.

Optionally, the touch key array is in the shape of a linear strip.

Optionally, the motor driving unit is a circuit including an insulated gate bipolar transistor.

Optionally, the motor drive unit and the main control unit are external to the motor.

From the above, the motor drive unit and the main control unit are not in contact with the motor, which avoids shortening the life of the frequency conversion board due to the heating of the motor and improves the service life.

Optionally, the motor is a DC brushless motor.

Description of drawings

Figure 1 is a schematic diagram of the principle of the range hood;

Fig. 2 is a structural schematic diagram of the control panel.

Detailed ways

The embodiment of the utility model provides a range hood, which adjusts the operating frequency of the motor according to the detected motor noise to reduce the noise of the range hood; The current speed and the speed control command adjust the motor speed to realize the smooth start of the motor and reduce the loss of the motor. The embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the range hood includes a main control unit 10, a storage unit 11, a control panel 12, a motor drive unit 13, a motor speed detection unit 14, an alarm unit 16 and a noise detection unit 17 respectively connected to the main control unit 10, And the motor 15 connected with the motor drive unit 13 , the motor speed detection unit 14 and the noise detection unit 17 .

The control panel 12 includes a touch panel 121 , a main control board (not shown) and a display panel 122 connected in sequence. As shown in FIG. 2 , the touch panel 121 is provided with a group of linear strip-shaped touch key arrays, and each touch key is in the shape of a ring with a light-transmitting hole in the center. A group of LED indicator arrays are arranged on the display panel 122 . The LED indicator array is composed of a plurality of LED indicator lights arranged at intervals. The number and positions of the LED indicator lights correspond to the light-transmitting holes on the touch panel 121 . In this embodiment, the touch key array of the touch panel 121 includes 80 touch keys, which correspond to 80 different rotational speeds.

The user slides and touches the touch panel 121 to issue a fan speed control command. The main control board receives the touch information, controls the corresponding LED indicators on the display panel 122 to turn on, and outputs the above touch information after encoding.

The main control unit 10 performs closed-loop adjustment based on the above touch information and the motor 15 speed detected by the motor speed detection unit 14 described later, and controls the motor 15 to work at a constant torque by adjusting the output duty cycle. In addition, the main control unit 10 is also used to control the constant torque operation of the motor 15 by adjusting the output duty ratio according to the noise information described later, and the effective frequency of the output duty ratio is 25Hz~105Hz.

The inside of the main control unit 10 includes a rectifier, a filter circuit and an inverter connected in sequence (none of which are shown in the figure). The rectifier is used to convert the external power supply into direct current suitable for the work of the main control unit 10; the inverter is used to adjust the duty cycle output according to the touch information and the motor 15 speed; or to adjust the motor 15 speed according to the noise information described later, so that the motor 15 Constant torque work. The function of the main control unit 13 is realized by a circuit including a DSPIC30F3010 chip.

The motor drive unit 13 is connected between the main control unit 10 and the motor 15 , and is used for receiving the duty ratio control command output by the main control unit 10 to drive the motor 15 to run. When the received duty cycle frequency is lower than 25Hz or higher than 105Hz, it is regarded as an invalid command. The function of the motor drive unit 13 is realized by an insulated gate bipolar transistor (IGBT, Insulated Gate Bipolar Transistor) module.

In this embodiment, the motor 15 adopts a DC brushless motor. Through tests, under the same large air volume, the AC asynchronous motor needs an input power of 220W, while the DC motor only needs about 125W; under the same small air volume, the AC asynchronous motor needs 100W. The input power of the DC motor is only about 30W; by comparison, the efficiency of the DC motor is more than 30% higher than that of the AC asynchronous motor.

The motor rotation speed detection unit 14 is used to detect the rotation speed of the motor 15 . The detected rotation speed is sent to the main control unit 10 , and the main control unit 10 close-loop adjusts the output control information according to the user's touch information to adjust the rotation speed of the motor 15 .

The motor speed detection unit 14 is powered by an independent power source (not shown), such as a rechargeable power module or a button battery. When the range hood works normally, the external power supply charges the independent power supply. When the range hood is turned off, the independent power supply can still support the motor speed detection unit 14 to work. Thus, when the range hood is turned off, the motor 15 has not stopped due to inertia and the range hood is turned on again, the motor speed detection unit 14 detects the speed of the motor 15 in real time and feeds it back to the main control unit 10, and the current speed and the speed control command Perform closed-loop adjustment to achieve smooth motor start and reduce motor loss.

The noise detection unit 17 is used to detect the noise generated by the motor 15 due to resonance, and transmit the noise information to the main control unit 10 . The main control unit 10 is also used for judging whether the current noise exceeds the standard according to the noise judging information stored in the storage unit 11 . If it exceeds the standard, adjust the duty cycle output to avoid the resonance interval. For example, if the speed of the motor 15 is 710RPM~790RPM, the noise exceeds the standard, and if the current speed of the motor 15 is 710RPM~750RPM, the main control unit 10 reversely adjusts the speed of the motor 15 by adjusting the duty cycle, and the motor The drive unit 13 drives the motor 15 so that the speed reaches 700 RPM; if the current motor 15 rotates at 751 RPM to 790 RPM, the main control unit 10 adjusts the duty ratio positively to the motor 15 so that the motor 15 reaches 700 RPM. 800RPM.

Preferably, the noise detection unit 17 is arranged at the volute tongue of the fan.

Preferably, it also includes a voltage detection module, a current detection module and a phase loss detection module (none of which are shown in the figure), the above modules are respectively connected with the motor 15 and the main control unit 10, and are used to detect the operation status information of the motor 15. The above-mentioned detection modules are all existing technologies, and can be realized by existing circuits, so details are not repeated here.

The main control unit 10 is also used for comparing the received motor 15 running status information with the received motor 15 running status information according to the standard running status information stored in the storage unit 11, and judging whether the motor 15 is running normally. control information. The fault information is output in the form of duty cycle. The storage unit 11 stores a correspondence relationship between fault information and control information of the alarm unit 16 .

The alarm unit 16 is used for alarming according to the information, and the alarm unit 16 uses an LED indicator light to flash according to the fault information to complete the alarm. For example, if the LED indicator flashes 4 times, it indicates that the voltage is high; Flashing 9 times means the current is high, and the LED indicator flashing 12 times means the motor is running without phase.

The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. For example, each device in the application is integrated into a PCB board, and the PCB board and the motor are separately arranged, and the PCB board is separated from the motor. The board is placed outside the motor and is not in contact with the motor, so the life of the inverter board will not be shortened due to the heating of the motor. In a word, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims (8)

1. lampblack absorber comprises: the main control unit of Lian Jieing (10), electric-motor drive unit (13) and motor (15) successively; It is characterized in that, also comprise: the noise measuring unit (17) that is connected with main control unit (10);

Described main control unit (10) is used for determining interval of resonance according to the motor noise that noise measuring unit (17) are detected, and regulate output with the dutycycle of evading interval of resonance to electric-motor drive unit (13), the permanent torque running of drive motors (15).

2. lampblack absorber according to claim 1 is characterized in that, also comprises:

Control panel (12) is used to receive the blower fan wind speed control instruction that the user imports;

Motor speed detecting unit (14) is connected with motor (15);

Described main control unit (10) also is connected respectively with motor speed detecting unit (14) with display floater (12), is used for the rotating speed according to blower fan wind speed control instruction and motor (15), the dutycycle that motor speed is regulated in closed loop output.

3. lampblack absorber according to claim 2 is characterized in that, described motor speed detecting unit (14) adopts the independent current source power supply.

4. lampblack absorber according to claim 2 is characterized in that, described control panel (12) is provided with touch key-press array and indicator lamp corresponding with it.

5. lampblack absorber according to claim 4 is characterized in that, described touch key-press array is type band shape linearly.

6. lampblack absorber according to claim 1 is characterized in that, described electric-motor drive unit (13) is the circuit that comprised insulated gate bipolar transistor.

7. lampblack absorber according to claim 6 is characterized in that, described electric-motor drive unit (13) and main control unit (10) are placed on described motor (15).

8. lampblack absorber according to claim 1 is characterized in that, described motor (15) is a dc brushless motor.

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