Range hood and control method thereof

Abstract

The invention relates to a range hood and a control method thereof. The range hood comprises a shell, a range hood cover and a control device, the fan is arranged in the shell; the panel is arranged on the front side of the shell, and a smoke inlet is formed in the panel; the oil screen is arranged at the smoke inlet and is opposite to the air inlet of the fan; the range hood is characterized in that the oil screen can be restrained on the panel in a moving mode, and therefore the area, shielded by the oil screen, of the air inlet of the draught fan is changed. The fan has the advantages that by moving the oil net, the impeller can be conveniently disassembled, meanwhile, the area, shielded by the oil net, of the air inlet of the fan can be changed, the air inlet flowing state of the fan is improved, front-end resistance is reduced, and the noise value is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fume purification, and particularly to a range hood and a control method thereof. Background Art

[0002] A range hood is a kitchen product for purifying the kitchen environment. The range hood works based on the principle of fluid dynamics, and sucks and discharges fumes through a fan installed inside the range hood. The fan includes a volute, an impeller installed in the volute, and a motor that drives the impeller to rotate. When the impeller rotates, a negative pressure suction is generated at the center of the fan, sucking the fumes below the range hood into the fan. After being accelerated by the fan, the fumes are collected by the volute and guided out of the room.

[0003] Due to the improvement of the performance of range hoods, the size of the fan is getting larger and larger. The relative position relationship between the fan and the fan frame has gradually changed from the original lower position to the middle-lower position and even the middle position, causing the center position of the fan to move upward. For example, a Chinese invention patent with the application number CN202310923326.0 (publication number CN116771697A) discloses a range hood, which proposes a solution of making a notch in the fan frame and a special design for the air inlet of the fan. On the one hand, when the outer edge position of the impeller is higher than the top plate of the fan frame by a certain distance, the removal of the impeller becomes impossible (the conventional impeller cleaning and maintenance requirements of the range hood), and the strength of the fan frame will become weaker. On the other hand, the panel in front of the air inlet of the fan blocks the air inlet of the fan to a large extent, greatly affecting the fume suction performance. Therefore, further improvements to the existing technology are needed. Summary of the Invention

[0004] The first technical problem to be solved by the present invention is to provide a range hood that can not only facilitate the removal of the impeller but also improve the fume suction performance in view of the above-mentioned prior art.

[0005] The second technical problem to be solved by the present invention is to provide a control method for the above-mentioned range hood.

[0006] The technical solution adopted by the present invention to solve the above first technical problem is as follows: A range hood includes:

[0007] A housing;

[0008] A fan disposed inside the housing;

[0009] A panel disposed on the front side of the housing, and an air inlet is provided on the panel;

[0010] An oil screen disposed at the air inlet and opposite to the air inlet of the fan;

[0011] Characterized in that: the oil screen can be movably constrained on the panel, so as to change the area of the air inlet of the fan blocked by the oil screen.

[0012] To form a moving area of the oil net, a groove for installing the oil net is provided on the panel. Denote the width direction of the oil net as the up-and-down direction, and the oil net is constrained in the groove in a manner that it can move along the up-and-down direction.

[0013] To limit the length direction of the oil net so that the oil net moves more smoothly, the length of the oil net matches the length of the groove.

[0014] To realize the movement of the oil net, a driving mechanism capable of being connected to the oil net drive is provided on the panel or in the housing, and the driving mechanism is used to drive the oil net to move.

[0015] To automatically improve the oil fume extraction performance, a sensor for detecting the resistance at the air inlet of the fan is provided in the housing. The sensor is electrically connected to a controller, and the controller is electrically connected to the driving mechanism. The controller is configured to: correspondingly control the driving mechanism according to the detection result of the sensor.

[0016] Preferably, the first way of the above driving mechanism is: the driving mechanism includes an electromagnet that generates a magnetic field after being energized and a magnetic member that can be attracted by the magnet generated by the electromagnet. The electromagnet is provided on the panel, and the magnetic member is provided on the oil net.

[0017] Preferably, the electromagnet is electrically connected to a power supply module. The power supply module includes a current controller that can control the supply current of the electromagnet. The controller is electrically connected to the current controller, so that the controller can correspondingly control the driving mechanism by controlling the current controller.

[0018] To make the left-and-right movement of the oil net synchronous, denote the length direction of the oil net as the left-and-right direction. There are two magnetic members, which are respectively arranged on two side walls of the oil net in the left-and-right direction relatively.

[0019] Preferably, the second way of the above driving mechanism is: the driving mechanism is a driving motor.

[0020] The technical solution adopted by the present invention to solve the above second technical problem is: a control method of an oil fume extractor as described above, characterized by including:

[0021] The oil screen includes a closed section and a mesh section arranged in the width direction. There is a connecting line between the closed section and the mesh section of the oil screen. Denote the center point of the air inlet of the fan as point O, and denote the two vertices where the connecting line of the oil screen coincides with the outer edge of the air inlet of the fan as point P and point N. Points P and N form a line segment PN. Draw a line perpendicular to the line segment PN from point O, and denote the intersection point of the line and the line segment PN as point M. Points N and O form a line segment NO, and points M and O form a line segment MO. An included angle θ is formed between the line segment MO and the line segment NO. Control the movement of the oil screen so that the included angle θ is equal to a preset angle.

[0022] Specifically, if the air inlet of the fan is circular, the calculation formula for θ is:

[0023]

[0024] where X is the ratio of the blocked area of the air inlet of the fan to the total area of the air inlet of the fan, A is the length of the line segment MO, and D is the diameter of the air inlet of the fan.

[0025] Preferably, the value range of θ is:

[0026] Furthermore, the value of θ is:

[0027] Compared with the prior art, the advantages of the present invention are as follows: By moving the oil screen, while facilitating the disassembly and removal of the impeller, it can also change the area of the air inlet of the fan blocked by the oil screen, thereby improving the air inlet flow state of the fan, reducing the front-end resistance, and lowering the noise value. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of the range hood in Embodiment 1 of the present invention;

[0029] Figure 2 is Figure 1 the schematic structural diagram after the oil screen moves downward in

[0030] Figure 3 is Figure 2 the cross-sectional view of

[0031] Figure 4 is a schematic diagram of the oil screen blocking the air inlet of the fan in Embodiment 1 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The present invention will be further described in detail below with reference to the embodiments of the drawings.

[0033] Embodiment 1:

[0034] As Figures 1 to 3As shown in the figure, the range hood in this embodiment includes a housing 1, a fan 2, a panel 3, and an oil screen 4. Among them, the fan 2 is arranged inside the housing 1; the panel 3 is arranged on the front side of the housing 1, and an air inlet 31 is provided on the panel 3; a smoke baffle 5 is further provided on the front side of the panel 3, and the oil screen 4 is arranged at the air inlet 31 and is opposite to the air inlet 21 of the fan 2; the oil screen 4 in this embodiment can be movably constrained on the panel 3, so as to change the area of the air inlet 21 of the fan 2 blocked by the oil screen 4.

[0035] A groove 32 for installing the oil screen 4 is provided on the panel 3. Denote the width direction of the oil screen 4 as the up-down direction and the length direction of the oil screen 4 as the left-right direction. The oil screen 4 is constrained in the groove 32 in a manner that can move along the up-down direction. In order to enable the oil screen 4 to move only in the up-down direction, as Figure 1 shown, the length of the oil screen 4 in this embodiment matches the length of the groove 32.

[0036] A driving mechanism capable of being drivingly connected to the oil screen 4 is provided on the panel 3 or inside the housing 1, and the driving mechanism is used to drive the oil screen 4 to move. In addition, in order to achieve distance control of the movement of the oil screen 4, a sensor (not shown in the figure) for detecting the resistance at the air inlet 21 of the fan 2 is provided inside the housing 1. The sensor is electrically connected to a controller (not shown in the figure), and the controller is electrically connected to the driving mechanism. The controller is configured to: correspondingly control the driving mechanism according to the detection result of the sensor. The sensor in this embodiment can adopt the existing technology and will not be elaborated here. The controller can adopt the main controller of the range hood.

[0037] In this embodiment, the driving mechanism includes an electromagnet (not shown in the figure) that generates a magnetic field after being energized and a magnetic member (not shown in the figure) that can be attracted by the magnet generated by the electromagnet. The electromagnet is arranged on the panel 3, and the magnetic member is arranged on the oil screen 4. The magnetic member in this embodiment is a magnet, and there are two magnetic members, which are respectively arranged on the two side walls of the oil screen 4 in the left-right direction, so as to ensure the synchronous movement of the two side walls of the oil screen 4, and further realize the smooth movement of the oil screen 4.

[0038] The electromagnet is electrically connected to a power supply module (not shown in the figure). The power supply module includes a current controller (not shown in the figure) that can control the supply current of the electromagnet. The controller is electrically connected to the current controller, so that the controller can correspondingly control the driving mechanism by controlling the current controller. The current controller in this embodiment can adopt a variable resistor.

[0039] The working process of the oil screen movement in this embodiment is as follows: By changing the supply current of the electromagnet through the current controller, the magnetic force of the magnetic field generated by the electromagnet is further changed. Since the magnetic member can be attracted by the magnet generated by the electromagnet, the change in the magnetic force will drive the oil screen to move up and down.

[0040] This embodiment also relates to a control method for a range hood as described above, such as Figure 4 As shown, the control method includes: The oil mesh 4 includes a closed section 4a and a mesh section 4b arranged along the width direction. The mesh section 4b has honeycomb-shaped meshes. There is a connection line between the closed section 4a and the mesh section 4b of the oil mesh 4. Denote the center point of the air inlet 21 of the fan 2 as point O, and denote the two vertices where the connection line of the oil mesh 4 coincides with the outer edge of the air inlet 21 of the fan 2 as point P and point N. Points P and N form a line segment PN. Draw a line perpendicular to the line segment PN from point O, and denote the intersection point of the line and the line segment PN as point M. Points N and O form a line segment NO, and points M and O form a line segment MO. An included angle θ is formed between the line segment MO and the line segment NO. Control the movement of the oil mesh 4 so that the included angle θ is equal to a preset angle.

[0041] In this embodiment, the air inlet 21 of the fan 2 is circular. The structure of the fan 2 is a prior art and will not be elaborated here. Then, the calculation formula for θ is: Where X is the ratio of the blocked area of the air inlet of the fan to the total area of the air inlet of the fan, A is the length of the line segment MO, and D is the diameter of the air inlet of the fan.

[0042] The derivation process of the calculation formula for θ in this embodiment is:

[0043] The area of the triangle formed by points N, O, and M Where

[0044] The area of the air inlet of the fan blocked by the oil mesh

[0045] S Y Is the total area of the air inlet of the fan;

[0046] Then

[0047] The value range of θ is: The specific value of θ can be determined according to the detection results of the sensor or can be determined according to experience. Preferably, the value of θ is:

[0048] Embodiment 2:

[0049] Different from Embodiment 1, the driving mechanism in this embodiment is a driving motor (not shown in the figure).

[0050] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An oil fume extractor, comprising: A housing; A fan disposed inside the housing; A panel disposed on the front side of the housing, and an air inlet is formed on the panel; An oil screen disposed at the air inlet and opposite to the air inlet of the fan; Characterized in that: the oil screen can be movably constrained on the panel, so as to change the area of the air inlet of the fan blocked by the oil screen.

2. The range hood according to claim 1, wherein: A groove for installing the oil screen is provided on the panel. Denote the width direction of the oil screen as the up-down direction, and the oil screen is constrained in the groove in a manner that it can move along the up-down direction.

3. The range hood according to claim 2, wherein: The length of the oil screen matches the length of the groove.

4. The range hood according to any one of claims 1 to 3, characterized in that: A driving mechanism capable of being drivingly connected to the oil screen is provided on the panel or inside the housing, and the driving mechanism is used to drive the oil screen to move.

5. The range hood according to claim 4, wherein: A sensor for detecting the resistance at the air inlet of the fan is provided inside the housing. The sensor is electrically connected to a controller, and the controller is electrically connected to the driving mechanism. The controller is configured to: correspondingly control the driving mechanism according to the detection result of the sensor.

6. The range hood according to claim 5, characterized in that: The driving mechanism includes an electromagnet that generates a magnetic field after being energized and a magnetic member that can be attracted by the magnet generated by the electromagnet. The electromagnet is disposed on the panel, and the magnetic member is disposed on the oil screen.

7. The range hood according to claim 6, characterized in that: The electromagnet is electrically connected to a power module. The power module includes a current controller that can control the supply current of the electromagnet. The controller is electrically connected to the current controller, so that the controller can correspondingly control the driving mechanism by controlling the current controller.

8. The range hood according to claim 6, wherein: Denote the length direction of the oil screen as the left-right direction. There are two magnetic members, which are respectively disposed on two side walls of the oil screen in the left-right direction.

9. The range hood according to claim 5, wherein: The driving mechanism is a driving motor.

10. A control method for an oil fume purifier as described in any one of claims 1 to 9 above, characterized in that Including: The oil screen includes a closed section and a mesh section arranged along the width direction. There is a connection line between the closed section and the mesh section of the oil screen. Denote the center point of the air inlet of the fan as point O, and denote the two vertices where the connection line of the oil screen coincides with the outer edge of the air inlet of the fan as point P and point N. Points P and N form a line segment PN. Draw a straight line perpendicular to the line segment PN from point O, and denote the intersection point of the straight line and the line segment PN as point M. Points N and O form a line segment NO, and points M and O form a line segment MO. An included angle θ is formed between the line segment MO and the line segment NO. Control the movement of the oil screen, so that the included angle θ is equal to a preset angle.

11. The control method according to claim 10, characterized in that: If the air inlet of the fan is circular, the calculation formula for θ is: Wherein, X is the ratio of the blocked area of the air inlet of the fan to the total area of the air inlet of the fan, A is the length of the line segment MO, and D is the diameter of the air inlet of the fan.

12. The control method according to claim 11, wherein: The value range of the said θ is:

13. The control method according to claim 12, wherein: The value of θ is as follows:

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