A range hood and control method thereof

Abstract

The present invention discloses a range hood and a control method thereof. The range hood includes a smoke screen, a push rod, a motor, a conductive member and a controller; the controller is used to drive the push rod connected to the smoke screen to perform telescopic movement through a driving motor, so as to push the smoke screen to open and close; a sliding member is provided on the push rod, and the two ends of the sliding member are respectively electrically connected to the two ends of the conductive member, and the electrical connection position between the sliding member and the conductive member moves synchronously with the telescopic movement of the push rod; the controller is also used to collect the voltage at both ends of the conductive member. The present invention can obtain the precise position information of the smoke screen by arranging a sliding member that moves synchronously with the push rod, based on the electrical connection position between the sliding member and the conductive member moving synchronously with the telescopic movement of the push rod, and collecting the voltage at both ends of the conductive member by the controller.

Description

Technical Field

[0001] The present disclosure relates to the technical field of range hoods, and in particular to a range hood and a control method thereof. Background Art

[0002] The side-suction range hoods currently on the market are usually equipped with a smoke screen, which is opened and closed by a motion mechanism. The motion mechanism is basically driven by a push rod, which is driven by a 12V brushed DC motor. However, it is currently impossible to accurately control the position of the push rod.

[0003] At present, in order to measure the speed of brushed DC motors and achieve position control, the commonly used method is to use Hall sensors. However, Hall sensors have low reliability and are easily damaged, especially in the high temperature and oily working environment of range hoods.

[0004] Therefore, Hall sensors are difficult to be widely used in scenarios that require high reliability of range hood motion mechanisms, and the position of the smoke screen cannot be determined without Hall speed regulation. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the Hall sensor cannot accurately control the position of the push rod, and to provide a range hood and a control method thereof.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] A first aspect provides a range hood, comprising a smoke screen, a push rod, a motor, a conductive member and a controller;

[0008] The controller is used to drive the push rod connected to the smoke screen to perform telescopic movement through a driving motor, so as to push the smoke screen to open and close;

[0009] The push rod is provided with a sliding member, two ends of the sliding member are electrically connected to two ends of the conductive member respectively, and the electrical connection position between the sliding member and the conductive member moves synchronously with the telescopic movement of the push rod;

[0010] The controller is also used to collect the voltage across the conductive member.

[0011] Preferably, the push rod comprises a movable portion for connecting with the smoke screen and a transmission portion for connecting with the motor, and the sliding member is located on the movable portion.

[0012] Preferably, the sliding member includes a fixed portion and a conductive portion, the fixed portion is fixedly connected to the push rod, the conductive portion is fixedly connected to the fixed portion, and two ends of the conductive portion are electrically connected to two ends of the conductive member respectively.

[0013] Preferably, the fixing portion is arc-shaped and sleeved on the push rod, two ends of the conductive portion are respectively fixedly connected to two ends of the fixing portion, and both the fixing portion and the conductive portion are conductors.

[0014] Preferably, the conductive part is an elastic member.

[0015] Preferably, the fixing portion is an insulator, and the conducting portion is a conductor.

[0016] Preferably, the conductive member is a PCB board printed with a carbon film, and two ends of the sliding member are electrically connected to different positions of the carbon film respectively.

[0017] Preferably, the PCB board is rectangular, the carbon film printed on the PCB board is U-shaped, and two ends of the sliding member are electrically connected to two ends of the U-shaped carbon film respectively.

[0018] Preferably, one end of the conductive element is grounded, and the other end is connected to the controller and connected to a power source via a voltage-dividing resistor.

[0019] A second aspect provides a control method for a range hood, the control method being implemented using the range hood described above, the control method comprising:

[0020] The driving motor drives the push rod to perform telescopic movement to push the smoke screen to open and close;

[0021] collecting the voltage across the conductive member;

[0022] The displacement of the push rod is calculated based on the voltage, and the opening and closing position of the smoke screen is obtained based on the displacement of the push rod.

[0023] The positive and progressive effect of the present invention is that a sliding member that moves synchronously with the push rod can be arranged, and the electrical connection position between the sliding member and the conductive member moves synchronously with the telescopic movement of the push rod. The controller collects the voltage across the conductive member to accurately obtain the position information of the push rod, thereby achieving the precise position information of the smoke screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A first structural schematic diagram of a range hood provided in Embodiment 1 of the present disclosure;

[0025] Figure 2 A second structural schematic diagram of the range hood provided in Embodiment 1 of the present disclosure;

[0026] Figure 3 A third structural schematic diagram of the range hood provided in Embodiment 1 of the present disclosure;

[0027] Figure 4 A fourth structural schematic diagram of the range hood provided in Embodiment 1 of the present disclosure;

[0028] Figure 5 A fifth structural schematic diagram of the range hood provided in Embodiment 1 of the present disclosure;

[0029] Figure 6 A sixth structural schematic diagram of the range hood provided in Embodiment 1 of the present disclosure;

[0030] Figure 7 A schematic diagram of the detection circuit structure of the range hood provided in Example 1 of the present disclosure;

[0031] Figure 8 A flow chart of the range hood control method provided in Embodiment 2 of the present disclosure.

[0032] Description of Reference Numerals

[0033] Smoke screen 1

[0034] Motor 2

[0035] Putter 3

[0036] Transmission unit 31

[0037] Activities Department 32

[0038] Slide 4

[0039] Fixing portion 41

[0040] Conductive portion 42

[0041] Conductive parts 5

[0042] PCB board 51

[0043] Carbon film 52 DETAILED DESCRIPTION

[0044] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0045] Example 1

[0046] This embodiment provides a range hood, such as Figure 1 and Figure 2 As shown, it includes a smoke screen 1, a push rod 3, a motor 2, a conductive member 5 and a controller;

[0047] The controller is used to drive the push rod 3 connected to the smoke screen 1 to perform telescopic movement through the driving motor 2, so as to push the smoke screen 1 to open and close;

[0048] The push rod 3 is provided with a sliding member 4, and the two ends of the sliding member 4 are electrically connected to the two ends of the conductive member 5 respectively, and the electrical connection position between the sliding member 4 and the conductive member 5 moves synchronously with the telescopic movement of the push rod 3;

[0049] The controller is also used to collect the voltage across the conductive member 5 .

[0050] Specifically, a conductive member 5 is arranged parallel to the telescopic trajectory of the push rod 3, and a sliding member 4 is fixed on the push rod 3. Both ends of the sliding member 4 slide on the two ends of the conductive member 5 with the telescopic movement of the push rod 3, and at the same time, the sliding member 4 is electrically connected to the conductive member 5. When the sliding member 4 slides on the conductive member 5, the controller collects the voltage at both ends of the conductive member 5 through a detection circuit formed by an electrical connection with the conductive member 5. The resistance value of the conductive member 5 can be obtained based on the voltage of the conductive member 5, and the position of the sliding member 4 is further obtained, that is, the position of the push rod 3 is obtained, and finally the opening and closing position information corresponding to the smoke screen 1 is calculated through the position of the push rod 3.

[0051] As a feasible approach, Figure 3 and Figure 4 As shown, the push rod 3 includes a movable portion 32 for connecting with the smoke screen 1 and a transmission portion 31 for connecting with the motor 2 , and the sliding member 4 is located on the movable portion 32 .

[0052] Specifically, the sliding member 4 is fixedly connected to the movable portion 32 of the push rod 3 to achieve synchronous displacement of the contact of the sliding member 4 and the push rod 3. In one embodiment, the push rod 3 is a telescopic screw, and the transmission portion 31 of the telescopic screw is connected to the output end of the motor 2. Through the screw structure between the transmission portion 31 and the movable portion 32, the transmission portion 31 drives the movable portion 32 to move telescopically. The movable portion 32 is movably connected to the smoke screen 1, and the smoke screen 1 is opened and closed as the movable portion 32 is extended. As a feasible method, the shape of the contact surface between the conductive member 5 and the sliding member 4 matches the movement trajectory of the sliding member 4 during the extension and retraction of the push rod 3.

[0053] As a feasible approach, Figure 5 As shown, the sliding member 4 includes a fixed portion 41 and a conductive portion 42 , the fixed portion 41 is fixedly connected to the push rod 3 , the conductive portion 42 is fixedly connected to the fixed portion 41 , and two ends of the conductive portion 42 are electrically connected to two ends of the conductive member 5 , respectively.

[0054] Specifically, the sliding member 4 includes a fixing portion 41 that is fixedly connected to the push rod 3, and a conductive portion 42 that is electrically connected to the conductive member 5. The conductive portion 42 of the sliding member 4 has two ends, and the two ends are electrically connected to the two ends of the conductive member 5 to realize a circuit path.

[0055] As a feasible manner, the fixing portion 41 is arc-shaped and sleeved on the push rod 3 , and the two ends of the conductive portion 42 are respectively fixedly connected to the two ends of the fixing portion 41 , and both the fixing portion 41 and the conductive portion 42 are conductors.

[0056] Specifically, the fixing part 41 and the conductive part 42 are integrated parts, and the fixing part 41 is sleeved on the push rod 3 to form a fixed connection by using an interference fit between the arc-shaped part and the cylindrical outer surface of the push rod 3; in one embodiment, a buckle matching the fixing part 41 can be arranged on the push rod 3 to fix the fixing part 41 of the sliding member 4, so as to prevent the sliding member 4 from deforming due to force, causing the connection between the sliding member 4 and the push rod 3 to become loose or fall off, resulting in a virtual connection or disconnection between the contact of the sliding member 4 and the conductive member 5. Among them, the push rod 3 and the sliding member 4 are insulated.

[0057] As a feasible manner, the conductive part 42 is an elastic member.

[0058] Specifically, to avoid virtual contact between the conductive part 42 of the sliding member 4 and the conductive member 5 , the conductive part 42 is abutted against the conductive member 5 using an elastic member to ensure electrical connection between the conductive part 42 and the conductive member 5 during the sliding of the sliding member 4 on the conductive member 5 .

[0059] As a feasible manner, the fixing portion 41 is an insulator, and the conducting portion 42 is a conductor.

[0060] Specifically, the fixed portion 41 of the sliding member 4 is only used to achieve a fixed connection with the push rod 3, and the conductive portion 42 serves as a conductive portion 42 that forms a circuit path with the conductive member 5. Contacts are arranged at both ends of the conductive portion 42 to connect with the conductive member 5. The conductive portion 42 is fixedly connected to the push rod 3 through the fixed portion 41 and is insulated from the push rod 3.

[0061] As a feasible approach, Figure 6 As shown, the conductive member 5 is a PCB board 51 printed with a carbon film 52 , and both ends of the sliding member 4 are electrically connected to different positions of the carbon film 52 .

[0062] Specifically, the conductive member 5 uses a PCB board 51 as a base layer, and a carbon film 52 is printed on the PCB board 51 as a conductive layer. The two ends of the sliding member 4 are electrically connected to different positions of the carbon film 52 respectively, and are connected to the controller through the PCB board 51 to form a detection circuit.

[0063] As a feasible manner, the PCB board 51 is rectangular, the carbon film 52 printed on the PCB board 51 is U-shaped, and two ends of the sliding member 4 are electrically connected to two ends of the U-shaped carbon film 52 respectively.

[0064] Specifically, the surface of the PCB board 51 on which the carbon film 52 is printed is rectangular. According to actual needs, the carbon film 52 can be printed in a U-shape on the PCB board 51. A pair of parallel edges of the U-shape of the carbon film 52 correspond to the telescopic trajectory of the push rod 3. The two ends of the sliding member 4 are respectively electrically contacted with the parallel edges of the carbon film 52. As the position of the sliding member 4 on the carbon film 52 changes, the part of the carbon film 52 that is turned on changes accordingly. The controller obtains the position information of the sliding member 4 on the carbon film 52 by detecting the voltage at both ends of the PCB board 51, and further accurately calculates the opening and closing position information of the smoke screen 1.

[0065] In one embodiment, the carbon film 52 of the PCB board 51 printed with the carbon film 52 has a resistance value from end A to end B of the carbon film 52 of the maximum resistance value Rmax; during the movement of the push rod 3, the two carbon films 52 will be short-circuited at the position of the contact point of the sliding member 4, so that the resistance value from end A to end B is R ab , as the push rod 3 moves, the reed position changes, R ab The resistance value also changes accordingly.

[0066] As a feasible approach, Figure 7 As shown, one end of the conductive member 5 is grounded, and the other end is connected to the controller and connected to the power supply through a voltage-dividing resistor.

[0067] Specifically, the circuit between the sliding member 4, the conductive member 5 and the controller forms a short circuit, and a voltage dividing resistor is arranged between the controller and the conductive member 5. In one embodiment, the voltage V collected by the controller ab =5×R ab / (R ab +R1), where the voltage divider resistor R1 is a fixed value, then the voltage V collected by the controller ab Then with R ab Change and change, that is, V ab As the position of the push rod 3 changes; therefore, according to V ab The current position of the push rod 3 can be determined by the value of, and the position of the smoke screen 1 can also be determined.

[0068] The range hood provided in this embodiment can arrange a sliding member 4 that moves synchronously with the push rod 3. Based on the electrical connection position between the sliding member 4 and the conductive member 5 moving synchronously with the telescopic movement of the push rod 3, the controller collects the voltage across the conductive member 5 to accurately obtain the position information of the push rod 3, thereby achieving the acquisition of precise position information of the smoke screen 1.

[0069] Example 2

[0070] This embodiment provides a control method for a range hood, such as Figure 8 As shown, the control method is implemented using the above-mentioned range hood, and the control method includes:

[0071] S101, the driving motor drives the push rod to perform telescopic movement to push the smoke screen to open and close;

[0072] S102, collecting the voltage at both ends of the conductive member;

[0073] S103, calculating the displacement of the push rod based on the voltage, and obtaining the opening and closing position of the smoke screen based on the displacement of the push rod.

[0074] Specifically, the controller drives the push rod to extend and retract by controlling the motor stroke according to the operation instruction, so as to push the smoke screen to the specified position. In one embodiment, the controller detects the voltage at both ends of the conductive member after the motor stroke is completed, further calculates the displacement of the push rod and the opening and closing position information of the smoke screen, and determines whether the opening and closing position information of the smoke screen 1 meets the position information set in the operation instruction; if not, the motor 2 is controlled to adjust the telescopic position of the push rod 3 according to the difference between the detected opening and closing position information of the smoke screen 1 and the set position information, thereby realizing precise control of the position of the smoke screen 1.

[0075] In one embodiment, the controller detects the voltage across the conductive member in real time during the operation of the motor, further calculates the displacement of the push rod and the opening and closing position information of the smoke screen 1, and determines whether the opening and closing position information of the smoke screen reaches the position information set in the operation instruction; if reached, the motor is controlled to stop working to achieve precise control of the position of the smoke screen.

[0076] The control method of the range hood provided in this embodiment can arrange a sliding part that moves synchronously with the push rod, based on the electrical connection position between the sliding part and the conductive part moving synchronously with the telescopic movement of the push rod, and the controller collects the voltage across the conductive part to accurately obtain the position information of the push rod, thereby achieving the acquisition of precise position information of the smoke screen.

[0077] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A range hood, characterized in that: It includes a smoke screen, a push rod, a motor, a conductive part and a controller; The controller is used to drive the push rod connected to the smoke screen to perform telescopic movement through a driving motor, so as to push the smoke screen to open and close; The push rod is provided with a sliding member, two ends of the sliding member are electrically connected to two ends of the conductive member respectively, and the electrical connection position between the sliding member and the conductive member moves synchronously with the telescopic movement of the push rod; The controller is also used to collect the voltage across the conductive member; The push rod comprises a movable part for connecting with the smoke screen and a transmission part for connecting with the motor, and the sliding member is located on the movable part; The sliding member comprises a fixed portion and a conductive portion, the fixed portion is fixedly connected to the push rod, the conductive portion is fixedly connected to the fixed portion, and two ends of the conductive portion are respectively electrically connected to two ends of the conductive member; The fixing part is arc-shaped and sleeved on the push rod. Two ends of the conductive part are respectively fixedly connected to two ends of the fixing part. Both the fixing part and the conductive part are conductors.

2. The range hood according to claim 1, characterized in that: The conductive part is an elastic member.

3. The range hood according to claim 1, characterized in that: The fixing part is an insulator, and the conducting part is a conductor.

4. The range hood according to any one of claims 1 to 3, characterized in that: The conductive member is a PCB board printed with a carbon film, and two ends of the sliding member are electrically connected to different positions of the carbon film respectively.

5. The range hood according to claim 4, characterized in that: The PCB board is rectangular, the carbon film printed on the PCB board is U-shaped, and two ends of the sliding member are electrically connected to two ends of the U-shaped carbon film respectively.

6. The range hood according to claim 1, characterized in that: One end of the conductive element is grounded, and the other end is connected to the controller and connected to a power source through a voltage-dividing resistor.

7. A method for controlling a range hood, characterized in that: The control method is implemented by using the range hood according to any one of claims 1 to 6, and the control method comprises: The driving motor drives the push rod to perform telescopic movement to push the smoke screen to open and close; collecting the voltage across the conductive member; The displacement of the push rod is calculated based on the voltage, and the opening and closing position of the smoke screen is obtained based on the displacement of the push rod.

Images