A range hood and a control method thereof

Abstract

The application discloses an oil fume extractor and a control method thereof. The oil fume extractor comprises a power device, the power device comprises a fan frame and a fan arranged in the fan frame, the fan is horizontally arranged, and the fan comprises a downward air inlet; the fan is rotationally connected with the fan frame to change the angle of the air inlet relative to a horizontal plane; the oil fume extractor further comprises a moving mechanism for driving the fan to rotate, and the moving mechanism is a pneumatic mechanism taking the gas in the fan as a gas source. Compared with the prior art, the application has the advantages that: the gas in the fan is taken as a gas source to drive the fan to rotate for posture adjustment, external power is not needed for driving, the movement is stable and reliable, the moving mechanism can still maintain high-precision control after long-term use, the oil fume extractor can better adapt to the needs of different users at different times and different cooking methods, and the pneumatic noise of the oil fume extractor is greatly reduced through the simultaneous improvement of the air flow inside and outside the fan.

Description

Technical Field

[0001] This invention relates to an oil fume purification device, and more particularly to a range hood and a control method for the range hood. Background Technology

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. They operate on the principles of fluid dynamics, using a centrifugal fan inside to draw in cooking fumes and a filter to remove some grease particles. The centrifugal fan consists of a casing, an impeller housed within the casing, and a motor that drives the impeller. As the impeller rotates, a negative pressure is generated at the center of the fan, drawing in the cooking fumes from below. After being accelerated by the fan, the fumes are collected by the casing and guided outdoors.

[0003] As the core power system of a range hood, the fan is generally fixed to the top and rear panel (e.g., side-suction type) or the fan frame (e.g., top-suction type). The aerodynamic noise of the fan is the main noise source of the range hood, and its distance from the user greatly affects the user experience. To reduce noise, some split-type range hoods place the fan on top or in the exhaust duct section. For example, Chinese Patent Application No. 201821517326.1 discloses a range hood and fume purification system. This range hood includes a fume collection hood, a centrifugal fan, and a guide channel located between the two. The centrifugal fan is located at the top of the range hood and its impeller axis is arranged vertically above the ceiling. The inlet of the guide channel is connected to the fume collection hood, and the outlet is opposite to the air inlet of the centrifugal fan, with the air inlet facing downwards.

[0004] This ceiling-mounted fan design requires significant installation space. Once installed, the fan is typically fixed and its speed can only be adjusted based on resistance, not its orientation or flow distribution. This prevents the determination of the desired airflow and inlet velocity, resulting in inadequate smoke extraction. Some range hoods adjust based on the inlet velocity, but this doesn't assess whether the flow within the volute has improved. While some designs offer orientation adjustment, these methods require additional motors or hydraulic systems. Top-mounted connections suffer from low stability and reliability, placing high demands on motor self-locking. Long-term operation can lead to reduced control precision and safety hazards due to gear wear. Therefore, further improvements are needed. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a range hood that improves the stability and reliability of its movement and maintains high-precision control after long-term use, in order to address the shortcomings of the prior art.

[0006] The second technical problem to be solved by the present invention is to provide a control method for the above-mentioned range hood.

[0007] The technical solution adopted by the present invention to solve the first technical problem mentioned above is as follows: a range hood, comprising a power unit, the power unit including a fan frame and a fan disposed within the fan frame, the fan being arranged horizontally, the fan including a downward-facing air inlet; characterized in that:

[0008] The fan is rotatably connected to the fan frame, which can change the angle of the air inlet relative to the horizontal plane;

[0009] The range hood also includes a motion mechanism for driving the fan to rotate, which is a pneumatic mechanism that uses the gas inside the fan as the air source.

[0010] By using the gas inside the fan as the air source to drive the fan to rotate and adjust its posture, the range hood can be driven without external power. The movement is stable and reliable, and the motion mechanism can maintain high-precision control even after long-term use. This allows it to adapt well to the resistance at different times in different users' homes and the needs of different cooking methods that produce oil fumes. By improving the airflow inside and outside the fan at the same time, the pneumatic noise of the range hood is greatly reduced.

[0011] Furthermore, the fan includes a volute, the volute including an annular wall and a volute tongue, and an elongated through groove is formed on the annular wall of the volute near the volute tongue;

[0012] The pneumatic mechanism includes an air inlet, and the through groove is connected to the air inlet, allowing fluid communication between the inside of the volute and the pneumatic mechanism. This collects high-pressure gas from the tail section of the volute tongue, achieving vortex breaking in the high-pressure section inside the volute and drive without external power.

[0013] Furthermore, to facilitate fluid communication between the volute and the pneumatic mechanism, an air collecting component is provided at the through groove. The air collecting component is a hollow column with an open side facing the through groove and an air collecting port on the side wall away from the through groove. The air collecting port and the air inlet of the pneumatic mechanism are connected by a flexible hose for fluid communication.

[0014] Furthermore, to facilitate the rotation of the fan, the motion mechanism includes a base fixed to the fan frame, an energy storage valve rotatably connected to the base, and a primary air delivery cylinder. The energy storage valve includes a slide tube that allows gas to enter. The primary air delivery cylinder extends into the slide tube and can slide relative to the slide tube under the action of the gas. The end of the primary air delivery cylinder located outside the slide tube is used to connect to the fan.

[0015] Furthermore, the motion mechanism also includes a secondary air supply cylinder, a portion of which extends from the end of the primary air supply cylinder into the primary air supply cylinder. The energy storage valve, the primary air supply cylinder, and the secondary air supply cylinder are in sequential fluid communication. The end of the secondary air supply cylinder outside the primary air supply cylinder is closed and used for connection to the fan, allowing the secondary air supply cylinder to slide relative to the primary air supply cylinder. By setting a two-stage drive, the requirements for adjusting stroke and adjusting force can be met.

[0016] Furthermore, to facilitate pressurization of the second stage and increase driving force, the flow area inside the second-stage air delivery cylinder is smaller than that inside the first-stage air delivery cylinder.

[0017] Furthermore, to facilitate pressurization of the gas entering the primary gas delivery cylinder and increase the driving force, the motion mechanism also includes a first nut. The first nut is disposed at the end of the primary gas delivery cylinder located inside the slide. A first flow channel is formed inside the first nut, and the flow area of ​​the first flow channel is smaller than the flow area of ​​the slide and the primary gas delivery cylinder.

[0018] Furthermore, to facilitate airtightness between the secondary air delivery cylinder and the primary air delivery cylinder, the motion mechanism also includes a second nut. The second nut is disposed at the end of the secondary air delivery cylinder located inside the primary air delivery cylinder. A second flow channel is formed inside the second nut, which is in fluid communication with the secondary air delivery cylinder. The second nut is threadedly connected to the primary air delivery cylinder.

[0019] Furthermore, to facilitate the connection between the motion mechanism and the fan, the motion mechanism also includes a connecting rod and a drive bracket. The connecting rod is enclosed at the end of the secondary air delivery cylinder located outside the primary air delivery cylinder. The connecting rod and the secondary air delivery cylinder can rotate relative to each other and move synchronously in a straight line. The connecting rod is rotatably connected to the drive bracket, and the drive bracket is fixed to the volute.

[0020] To facilitate the control of the pneumatic mechanism, the energy storage valve also includes a valve body and a valve core. The valve body has a hollow structure, with one end open to form an air inlet, and an air outlet is provided on the side wall of the valve body. The valve core is disposed in the valve body so that the air outlet and the air inlet can be connected or closed.

[0021] The slide tube is connected to the valve body, and the air outlet allows fluid communication between the valve body and the inside of the slide tube.

[0022] To facilitate control of the pneumatic mechanism at the required pressure for adjusting the fan's swing angle, the energy storage valve also includes an overflow valve, which is in fluid communication with the air inlet.

[0023] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a control method for a range hood as described above, wherein the range hood further includes an air inlet assembly, characterized in that: an air collecting component is provided on the fan, the air collecting component is a hollow column, an air collecting port is opened on the air collecting component, and the air collecting port and the air inlet of the pneumatic mechanism are connected by a hose so that the fan and the pneumatic mechanism are in fluid communication.

[0024] A noise sensor is installed on the air inlet assembly, a first flow rate sensor is installed at the bottom of the fan frame where the oil fume enters, the flow area at the location where the first flow rate sensor is installed on the fan frame is S1, a second flow rate sensor is installed inside the air collection component, and the flow area of ​​the air collection port is S2.

[0025] The control method includes the following steps:

[0026] 1) Begin;

[0027] 2) Turn on the range hood;

[0028] 3) The first flow velocity sensor and the second flow velocity sensor respectively collect the current data and record it as v1 and v2, set the counter c = 0, and the energy storage valve closes the overflow valve and the valve core;

[0029] 4) Let A1 = S1 × v1, A2 = S2 × V2; and calculate...

[0030] 5) Determine whether B < B0 is true. If yes, the energy storage valve will open the valve core to supply air to each air delivery cylinder after collecting air for a certain period of time, adjust the fan swing angle, and proceed to step 6); if no, proceed to step 8); where B0 is a preset threshold.

[0031] 6) Let the counter c = c + 1;

[0032] 7) The first and second flow velocity sensors respectively collect the current data and record it as v1 and v2, where 1 = S1 × v1 and A2 = S2 × V2; and calculate...

[0033] 8) Determine if c < c0 is true. If yes, return to step 5). If no, the energy storage valve closes the valve core, opens the overflow valve, locks the fan, and c0 is the preset number of fan swing angle adjustments.

[0034] 9) The noise sensor collects the current data L0 and determines that L0 > L 预设 If the condition is true, the energy storage valve opens its valve core for a certain period of time, the fan returns to the previous swing angle state, and then returns to step 3). If not, the current state is maintained until the end, where L... 预设 This is the preset minimum noise level to achieve silence.

[0035] Compared with existing technologies, the advantages of this invention are as follows: It uses the gas inside the fan as a source to drive the fan's rotation and adjust its posture, achieving drive without external power. The movement is stable and reliable, and the motion mechanism maintains high-precision control even after long-term use. This allows it to better adapt to varying resistance levels in different homes and the needs of different cooking methods that produce oil fumes. By simultaneously improving the internal and external airflow of the fan, the pneumatic noise of the range hood is greatly reduced. In particular, the fan's pressure tap is located near the volute tongue to collect high-pressure gas and break up vortices in the high-pressure section. Based on the inlet air velocity and the return gas velocity at the volute's air collection port, the fan's posture is intelligently adjusted. Based on this mode, optimal inlet and internal airflow conditions can be achieved under different rear-end resistance levels. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of a range hood according to an embodiment of the present invention;

[0037] Figure 2 This is a cross-sectional view (left-right cross-section, adjusted state) of the power unit of the range hood according to an embodiment of the present invention;

[0038] Figure 3 This is an exploded view of the power unit of the range hood according to an embodiment of the present invention;

[0039] Figure 4 This is a cross-sectional view (front and rear section) of the power unit of the range hood according to an embodiment of the present invention;

[0040] Figure 5 for Figure 3 A schematic diagram of the motion mechanism;

[0041] Figure 6 This is a cross-sectional view of the motion mechanism of the range hood according to an embodiment of the present invention (with the drive support hidden);

[0042] Figure 7 This is an exploded structural diagram of the motion mechanism of the range hood according to an embodiment of the present invention (with the drive support hidden);

[0043] Figure 8 This is a partial schematic diagram of the energy storage valve of the moving mechanism of the range hood according to an embodiment of the present invention;

[0044] Figure 9 for Figure 8 A sectional view;

[0045] Figure 10 This is an assembly diagram of the fan and air collection component of a range hood according to an embodiment of the present invention;

[0046] Figure 11 for Figure 10A magnified schematic diagram of part I;

[0047] Figure 12 This is an exploded structural diagram of the fan and air collection component of the range hood according to an embodiment of the present invention;

[0048] Figure 13 This is a cross-sectional view (the cross-section is perpendicular to the length direction) of the air collection component of the range hood according to an embodiment of the present invention;

[0049] Figure 14 This is a cross-sectional view (initial state) of the power unit of the range hood according to an embodiment of the present invention;

[0050] Figure 15 for Figure 14 A sectional view of the motion mechanism (with the drive bracket hidden);

[0051] Figure 16 This is a control flowchart of a range hood according to an embodiment of the present invention. Detailed Implementation

[0052] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0053] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0054] See Figure 1 and Figure 2 A range hood includes a power unit 1, a connecting pipe 2, and an air intake component 3. The power unit 1 is installed above the kitchen ceiling, the air intake component 3 is used to draw in cooking fumes, and its specific air intake form is not limited. The connecting pipe 2 connects the power unit 1 and the air intake component 3.

[0055] See Figures 2-4The power unit 1 includes a fan frame 11 and a fan 12 disposed within the fan frame 11. In this embodiment, the fan 12 is a centrifugal fan, including a volute 121, an impeller 122 disposed within the volute 121, and a motor 123 for driving the impeller 122 to rotate. An air inlet 1211 and an air outlet 1212 are formed on the volute 121. The fan 12 is horizontally arranged, meaning its axis extends vertically (initially, but after adjustment, a certain tilt relative to the vertical direction is allowed). The air inlet 1211 faces downwards, while the air outlet 1212 faces to the left or right. This horizontally placed fan has a height of only 290mm, meeting the installation needs of most users (over 80%) in their homes (approximately 320mm in the ceiling), and its size (sufficiently large horizontally) is guaranteed. The fan 12 also has low noise.

[0056] See Figures 2-5 The volute 121 includes a front cover plate 1213, a rear cover plate 1214 spaced above the front cover plate 1213, and an annular wall 1215 located between the front cover plate 1213 and the rear cover plate 1214. An air inlet 1211 is formed on the front cover plate 1213, and the front cover plate 1213, rear cover plate 1214, and annular wall 1215 together form an air outlet 1212. An air inlet ring 1216 is provided at the air inlet 1211. The volute 121 also includes a volute tongue 1218. This structure of the volute 121 can employ existing technology.

[0057] The range hood also includes an exhaust hood 4, which is fixed to the exhaust port 1212 of the fan 12 so that the fan 12 can exhaust fumes through the exhaust hood 4. The side wall of the fan frame 11 (e.g.) Figure 1 As shown on the right, Figure 2 An installation port 111 is provided on the left side shown. The air outlet shroud 4 extends from the installation port 111 into the fan frame 11 and is connected to the fan 12.

[0058] The fan 12 can rotate relative to the fan frame 11 around a front-to-back extending axis. A flange 13 is provided at the air outlet 1212 of the volute 121. The shape of the flange 13 is adapted to the air outlet 1212, being annular, with a rectangular or square outer edge. To facilitate the rotation of the fan 12, the bottom edge of the flange 13 is rotatably connected to the fan frame 11 via a hinge 14, etc., with the connection position not higher than the lower edge of the mounting opening 111. Other positions of the flange 13 are connected to corresponding positions on the fan frame 11 via flexible members 15. In this embodiment, the front and rear sides of the flange 13 are respectively connected to the side wall of the fan frame 11 (the side wall through which the air outlet shroud 4 passes), and the top edge of the flange 13 is connected to the top of the fan frame 11 or a side wall not lower than the upper edge of the mounting opening 111. The flexible member 15 covers the mounting opening 111. The flexible member 15 can be a felt roller blind assembly (i.e., felt that can be rolled up and unrolled) or a telescopic component, etc. Refer to the Chinese Patent Application No. 201910886712.0 disclosed by the applicant, in which the annular wall extension section is equivalent to the flexible component 15 of this application (only the connection method is different). This can prevent the air outlet hood 4 from forming a gap between the air outlet hood 4 and the mounting port 111 after the fan 12 rotates, thus avoiding pressure leakage at the mounting port 111. Alternatively, the aforementioned flexible component 15 can also connect the portion of the air outlet hood 4 located inside the fan frame 11 to the fan frame 11, as long as the mounting port 111 and the space inside the fan frame 11 can be isolated. Alternatively, the flange 13 can also be rotatably connected to the fan frame 11 at the top edge. In this case, the connection position of the flexible component 15 can be changed accordingly, that is, the original top edge connection position can be replaced with the bottom edge connection to the corresponding position of the fan frame 11.

[0059] A volute support 1217 can be installed at the bottom of the volute 121, such as at the junction of the front cover 1213 and the annular wall 1215. To facilitate the rotation of the fan 12, the range hood also includes a motion mechanism, see [link to relevant documentation]. Figure 2 , Figure 3 , Figures 5-9 The motion mechanism is a pneumatic mechanism, and its output end is connected to the volute support 1217. The motion mechanism includes a base 161, a bearing 162, a rocker arm 163, an accumulator valve 164, a primary air delivery cylinder 165, and a drive support 166. The base 161 is fixed to the inner wall of the fan frame 11, and the side walls of the base 161 and the mounting port 111 are respectively two opposite side walls of the fan frame 11. Figure 3 As shown, the mounting port 111 is located on the left side wall of the fan frame 11, while the base 161 is located on the right side wall of the fan frame 11. The fan frame 11 can be positioned with a folded edge to enhance its strength.

[0060] A rocker arm 163 is rotatably mounted on a base 161. A bearing 162 is installed on the base 161, and the shaft 1631 of the rocker arm 163 passes through the bearing 162, thereby rotatably connecting the rocker arm 163 to the base 161. The axis of rotation of the rocker arm 163 extends in the front-rear direction. An energy storage valve 164, as described above, is mounted on the rocker arm 163. The energy storage valve 164 includes a valve body 1641, a valve core 1642, an overflow valve 1643, a base 1644, and a slide cylinder 1645. The valve body 1641 has a hollow structure, preferably cylindrical, with one end open to form an air inlet 1646. The overflow valve 1643 is located at the end of the valve body 1641 opposite to the air inlet 1646. An air outlet 1647 is provided on the side wall of the valve body 1641. The valve core 1642 is disposed inside the valve body 1641. In this embodiment, a ball valve is used, located between the air inlet 1646 and the overflow valve 1643, and its position corresponds to the air outlet 1647. The valve core 1642 can be an existing structure. The flow channel formed inside it (not shown) can be aligned with (opening the air outlet 1647) or offset (closing the air outlet 1647) with the air outlet 1647. The air inlet 1646 and the air outlet 1647 can be connected or closed by rotation or linear movement, while the air inlet 1646 and the overflow valve 1643 can remain normally open. The valve core 1642 can be driven to move by an electromagnetic mechanism or a mechanical mechanism (not shown). The relief valve 1643 is electromagnetic and can adopt the relief valve structure commonly used in existing hydraulic devices. It determines the gas pressure inside the valve body 1641 of the accumulator valve 164, and then adjusts the relief pressure according to the conditions to realize the adjustable pressure inside the accumulator valve 164.

[0061] When gas is introduced into the inlet 1646, if the valve core 1642 is open (i.e., the outlet 1647 is open), and the pressure setting of the relief valve 1643 is relatively high, gas enters the slide 1645. If the pressure setting of the relief valve is relatively low, the pressure inside the slide 1645 is higher, and gas overflows from the relief valve 1643. When gas is introduced into the inlet 1646, if the valve core 1642 is closed (i.e., the outlet 1647 is closed), gas continues to be introduced and stored in the valve body 1641. The relief valve 1643 detects the gas pressure inside the valve body 1641. After the high-pressure gas is continuously input, the pressure increases, and eventually the pressure in the valve body 1641 is consistent with (or slightly higher than) the incoming flow pressure or the pressure set by the relief valve 1643, and gas overflows from the relief valve 1643.

[0062] The base 1644 is connected or fixed to the valve body 1641, and the two are in close contact. The air outlet 1647 allows fluid communication between the valve body 1641 and the interior of the base 1644. A slide cylinder 1645 is mounted on the base 1644. The base 1644 is hollow and open at one end towards the slide cylinder 1645. The slide cylinder 1645 is a hollow cylinder with openings at both ends, thus allowing fluid communication between the slide cylinder 1645 and the valve body 1641 through the air outlet 1647. The slide cylinder 1645 and the base 1644 can be separate structures or an integral structure. For ease of manufacturing and assembly, in this embodiment, the slide cylinder 1645 and the base 1644 are two independent components.

[0063] A portion of the primary air supply cylinder 165 extends from the end of the accumulator valve 164 away from the rocker arm 163 and into the slide cylinder 1645 of the accumulator valve 164. The primary air supply cylinder 165 can slide relative to the accumulator valve 164. The motion mechanism also includes a secondary air supply cylinder 168, a portion of which extends from the end of the primary air supply cylinder 165 and into it. Both the primary and secondary air supply cylinders 165 and 168 are hollow structures. The two ends of the primary air supply cylinder 165 are open, while the end of the secondary air supply cylinder 168 inside the primary air supply cylinder 165 is open, and the end outside the primary air supply cylinder 165 is closed. The flow area inside the secondary air supply cylinder 168 is smaller than that inside the primary air supply cylinder 165, thereby increasing the driving pressure to meet the requirements of stroke and force adjustment.

[0064] The motion mechanism also includes a first nut 1691 and a second nut 1692. The first nut 1691 is disposed at the end of the primary air supply cylinder 165 located within the slide cylinder 1645. The two can be connected and fixed or are an integral structure. In this embodiment, the first nut 1691 is threadedly connected to the primary air supply cylinder 165. A first flow channel 1693 is formed within the first nut 1691. The flow area of ​​the first flow channel 1693 is smaller than that of the slide cylinder 1645 and the primary air supply cylinder 165. A sealing ring 170 is provided at the end of the slide cylinder 1645 into which the primary air supply cylinder 165 extends to prevent gas leakage between the two. The second nut 1692 is disposed at the end of the secondary air supply cylinder 168 located within the primary air supply cylinder 165. The two can be connected and fixed or are an integral structure. In this embodiment, the second nut 1692 is integrally formed with the secondary air supply cylinder 168. A second flow channel 1694 is formed within the second nut 1692, which is in fluid communication with the secondary air supply cylinder 168. The second nut 1692 is threadedly connected to the first-stage air cylinder 165, thus ensuring both relative movement and airtightness between the two.

[0065] The motion mechanism also includes a connecting rod 1681, which is enclosed at the end of the secondary air delivery cylinder 168 located outside the primary air delivery cylinder 165. The connecting rod 1681 and the secondary air delivery cylinder 168 can rotate relative to each other and move synchronously in a straight line. To achieve the aforementioned relative movement and linkage, a spline connection can be used between the connecting rod 1681 and the secondary air delivery cylinder 168. The aforementioned drive bracket 166 can be connected to the connecting rod 1681. The connecting rod 1681 and the secondary air delivery cylinder 168 can rotate relative to the drive bracket 166, with the rotation axis parallel to the shaft 1631 of the rocker arm 163. The drive bracket 166 is fixed to the volute bracket 1217.

[0066] See Figure 14 and Figure 15 With the blower 12 in its initial state and the accumulator valve 164 not supplying gas, the primary gas delivery cylinder 165 slides into its maximum position within the slide 1645, and the secondary gas delivery cylinder 168 slides into the maximum position of the primary gas delivery cylinder 165. (See also...) Figure 2 and Figure 5 When gas is introduced into the accumulator valve 164, the gas enters the slide 1645 and then enters the primary gas delivery cylinder 165 through the first nut 1691, which can push the primary gas delivery cylinder 165 to gradually slide out of the slide 1645. The gas also continues to enter the secondary gas delivery cylinder 168 through the second nut 1692, which can push the secondary gas delivery cylinder 168 to gradually slide out of the primary gas delivery cylinder 165.

[0067] See Figure 4 , Figures 10-13 On the annular wall 1215 of the volute 121, near the volute tongue 1218 (in this embodiment, the volute profile is a logarithmic spiral, and the position near the volute tongue 1218 refers to approximately 85° of the logarithmic spiral), a long, narrow through groove 1219 is formed. The length of the through groove 1219 extends in a direction parallel to the axial direction of the impeller 122. High-speed eddies are easily generated at the aforementioned position near the volute tongue 1218. Part of the gas separated by the volute tongue 1218 will flow back here. A gas collecting element 17 can be installed at the through groove 1219 to make fluid communication between the through groove 1219 and the air inlet 1646 of the energy storage valve 164. This allows the fan 12 to oscillate and achieve a non-rigid connection by recovering the airflow within the volute 121. The gas collecting component 17 is also elongated and adapted to the through groove 1219. The gas collecting component 17 is a hollow column with an open side facing the through groove 1219, while a gas collecting port 171 is provided on the side wall away from the through groove 1219. A flexible hose (not shown) can be installed between the gas collecting port 171 and the air inlet 1646 of the energy storage valve 164 to connect the two ports and achieve fluid communication.

[0068] This enables the breaking of vortices in the high-pressure section inside the volute 121 and the rotation of the fan 12 to be driven without external power.

[0069] A noise sensor 51 is installed at the outlet of the air inlet assembly 3, such as at the lower end of the connecting pipe 2 or the upper end of the air inlet assembly 3. Figure 1 The image is shown in dashed lines and is located inside the flue of the range hood. A first flow rate sensor 52 is installed at the connection point between the bottom of the fan frame 11 and the connecting pipe 2, with a flow area of ​​S1. A second flow rate sensor 53 is installed inside the air collecting component 17, such as at the air collecting port 171 of the air collecting component 17, with a flow area of ​​S2 at the air collecting port 171.

[0070] The above-mentioned control method for range hoods,

[0071] 1) Start by selecting the gear, such as strong (q), weak (r), and automatic (z). This is the gear selection that is provided by the existing range hoods.

[0072] 2) When the range hood is turned on, the timer t of the main control module of the range hood can start timing (s) and record the working time;

[0073] 3) The first flow velocity sensor 52 and the second flow velocity sensor 53 respectively collect the current data and record it as v1 and v2, set the counter c of the main control module of the range hood to 0, close the overflow valve 1643 and valve core 1642 of the energy storage valve 164 to prevent the energy storage valve 164 from depressurizing, and collect the backflow gas of the volute 121 and pressurize it.

[0074] 4) Let A1 = S1 × v1, A2 = S2 × V2; and calculate...

[0075] 5) Determine whether B < B0 is true. If yes, after the energy storage valve 164 collects air for 8 seconds, open the valve core 1642 to supply air to each air delivery cylinder for 2 seconds, adjust the swing angle of the fan 12, and proceed to step 6); if no, proceed to step 8); B is generally between 0 and 15. In this embodiment, the preset threshold B0 is taken as 10. If B ≥ B0, it can be considered that the swing angle (the swing angle refers to the angle between the fan 12 and the horizontal plane) will continue to increase, and the backflow will intensify.

[0076] 6) Let the counter c = c + 1;

[0077] 7) The first flow velocity sensor 52 and the second flow velocity sensor 53 respectively collect the current data and record it as v1 and v2. Let A1 = S1 × v1 and A2 = S2 × v2; and calculate...

[0078] 8) Determine if c < c0 is true. If yes, return to step 5). If no, the energy storage valve 164 closes the valve core 1642, opens the overflow valve 1643, locks the current swing angle of the fan 12, and the overflow valve 1643 directly releases pressure. c0 is the preset number of swing angle adjustments, which is the complete swing angle of the volute 121 divided into c0 parts. In this embodiment, it can be taken as 30. Theoretically, increasing the swing angle is beneficial to improving flow, but excessive air intake may lead to an increase in vortices. Therefore, B is used as the judgment criterion.

[0079] 9) Noise sensor 51 collects the current data L0 and determines whether L0 > L 预设 If the condition is met, the accumulator valve 164 opens the valve core 1642 for a certain period of time, such as 2 seconds, then returns to the previous swing angle state, and then returns to step 3). If not, the current state is maintained until the end. Wherein, L... 预设 To achieve the preset minimum (ultimate) noise level for quiet operation, the L value is given based on the form of the ceiling-mounted range hood. 预设 It is approximately 56dB, and if this value is not reached, it will remain in a state of dynamic adjustment.

Claims

1. A range hood, comprising a power unit (1), the power unit (1) comprising a fan frame (11) and a fan (12) disposed within the fan frame (11), the fan (12) being horizontally arranged, the fan (12) comprising a downward-facing air inlet (1211); characterized in that: The fan (12) is rotatably connected to the fan frame (11) so as to change the angle of the air inlet (1211) relative to the horizontal plane. The fan (12) includes a volute (121). The volute (121) includes an annular wall (1215) and a volute tongue (1218). A long strip through groove (1219) is provided on the annular wall (1215) of the volute (1211) near the volute tongue (1218). The range hood also includes a motion mechanism for driving the fan (12) to rotate. The motion mechanism is a pneumatic mechanism that uses the gas inside the fan (12) as the air source. The pneumatic mechanism includes an air inlet (1646), and the through groove (1219) and the air inlet (1646) are connected to allow fluid communication between the volute (121) and the pneumatic mechanism.

2. The range hood according to claim 1, characterized in that: An air collecting component (17) is provided at the through groove (1219). The air collecting component (17) is a hollow column. The side of the air collecting component (17) facing the through groove (1219) is open. An air collecting port (171) is provided on the side wall of the air collecting component (17) away from the through groove (1219). The air collecting port (171) and the air inlet (1646) of the pneumatic mechanism are connected by a hose and are in fluid communication.

3. The range hood according to claim 1, characterized in that: The motion mechanism includes a base (161) fixed to the fan frame (11), an energy storage valve (164) rotatably connected to the base (161), and a primary air delivery cylinder (165). The energy storage valve (164) includes a slide cylinder (1645) that allows gas to enter. The primary air delivery cylinder (165) extends into the slide cylinder (1645) and can slide relative to the slide cylinder (1645) under the action of gas. The end of the primary air delivery cylinder (165) located outside the slide cylinder (1645) is used to connect to the fan (12).

4. The range hood according to claim 3, characterized in that: The motion mechanism also includes a secondary air supply cylinder (168), a portion of which extends from the end of the primary air supply cylinder (165) into the primary air supply cylinder (165). The energy storage valve (164), the primary air supply cylinder (165), and the secondary air supply cylinder (168) are in sequential fluid communication. The end of the secondary air supply cylinder (168) located outside the primary air supply cylinder (165) is closed and used to connect with the fan (12), so that the secondary air supply cylinder (168) can slide relative to the primary air supply cylinder (165).

5. The range hood according to claim 4, characterized in that: The flow area inside the secondary gas delivery cylinder (168) is smaller than the flow area inside the primary gas delivery cylinder (165).

6. The range hood according to claim 3, characterized in that: The motion mechanism also includes a first nut (1691), which is disposed at the end of the primary air delivery cylinder (165) located inside the slide cylinder (1645). A first flow channel (1693) is formed inside the first nut (1691), and the flow area of ​​the first flow channel (1693) is smaller than the flow area of ​​the slide cylinder (1645) and the primary air delivery cylinder (165).

7. The range hood according to claim 4, characterized in that: The motion mechanism also includes a second nut (1692), which is disposed at the end of the secondary air delivery cylinder (168) located inside the primary air delivery cylinder (165). A second flow channel (1694) is formed inside the second nut (1692), which is in fluid communication with the secondary air delivery cylinder (168). The second nut (1692) is threadedly connected to the primary air delivery cylinder (165).

8. The range hood according to claim 4, characterized in that: The motion mechanism also includes a connecting rod (1681) and a drive bracket (166). The connecting rod (1681) is enclosed at the end of the secondary air delivery cylinder (168) located outside the primary air delivery cylinder (165). The connecting rod (1681) and the secondary air delivery cylinder (168) can rotate relative to each other and can move synchronously in a straight line. The connecting rod (1681) is rotatably connected to the drive bracket (166), and the drive bracket (166) is fixed to the volute (121).

9. The range hood according to claim 3, characterized in that: The energy storage valve (164) also includes a valve body (1641) and a valve core (1642). The valve body (1641) has a hollow structure. One end of the valve body (1641) is open to form an air inlet (1646). An air outlet (1647) is provided on the side wall of the valve body (1641). The valve core (1642) is disposed inside the valve body (1641) so that the air outlet (1647) and the air inlet (1646) are connected or closed. The slide cylinder (1645) is connected to the valve body (1641), and the air outlet (1647) allows fluid communication between the valve body (1641) and the inside of the slide cylinder (1645).

10. The range hood according to claim 9, characterized in that: The energy storage valve (164) also includes an overflow valve (1643), which is in fluid communication with the air inlet (1646).

11. A control method for a range hood as described in claim 10, wherein the range hood further comprises an air inlet assembly (3), characterized in that: The fan (12) is provided with an air collecting component (17), which is a hollow column. An air collecting port (171) is opened on the air collecting component (17). The air collecting port (171) and the air inlet (1646) of the pneumatic mechanism are connected by a hose so that the fan (12) and the pneumatic mechanism are in fluid communication. A noise sensor (51) is installed on the air intake assembly (3), a first flow rate sensor (52) is installed at the bottom of the fan frame (11) where the oil fume enters, the flow area of ​​the fan frame (11) where the first flow rate sensor (52) is installed is S1, a second flow rate sensor (53) is installed in the air collection component (17), and the flow area of ​​the air collection port (171) is S2. The control method includes the following steps: 1) Begin; 2) Turn on the range hood; 3) The first flow velocity sensor (52) and the second flow velocity sensor (53) collect the current data and record it as v1 and v2 respectively. Set the counter c = 0, and the energy storage valve (164) closes the overflow valve (1643) and the valve core (1642); 4) Let A1 = S1 × v1, A2 = S2 × V2; and calculate... 5) Determine whether B < B0 is true. If yes, the energy storage valve (164) collects gas for a certain period of time, then the valve core (1642) is opened to supply gas to each gas delivery cylinder, the swing angle of the fan (12) is adjusted, and step 6) is entered; if no, step 8) is entered; where B0 is a preset threshold. 6) Let the counter c = c + 1; 7) The first flow velocity sensor (52) and the second flow velocity sensor (53) respectively collect the current data and record it as v1 and v2, where 1 = S1 × v1 and A2 = S2 × V2; and calculate 8) Determine whether c < c0 is true. If yes, return to step 5. If no, the energy storage valve (164) closes the valve core (1642), opens the overflow valve (1643), and locks the fan (12). c0 is the preset number of times the fan (12) swing angle is adjusted. 9) The noise sensor (51) collects the current data L0 and determines that L0 > L 预设 If the condition is true, the energy storage valve (164) opens the valve core (1642) for a certain period of time, the fan (12) returns to the previous swing angle state, and then returns to step 3). If not, the current state is maintained until the end, where L 预设 This is the preset minimum noise level to achieve silence.

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