Fan system for range hood, range hood and control method thereof

Abstract

The present invention relates to a fan system for a range hood, a range hood and a control method thereof, comprising: a volute, comprising two cover plates arranged opposite to each other and an annular wall connected between the two cover plates, at least one cover plate being provided with an air inlet, and an air outlet being defined between the two ends of the annular wall and the two cover plates; an impeller, arranged in the volute, the rotation axis of the impeller being recorded as a first axis; the cover plate having a first side portion adjacent to the air outlet and a second side portion away from the air outlet, at least one cover plate comprising at least two plate bodies connected in sequence from the first side portion to the second side portion, each of the plate bodies being independently rotatable and connected to the annular wall in an angle-adjustable manner relative to a plane perpendicular to the first axis of the impeller. The cover plates of the volute are arranged as a plurality of plate bodies that can be tilted and moved in sections, and the tilt angle can be independently adjusted according to different flow characteristic partitions in the air duct of the range hood and the upper and lower areas inside the volute.

Description

Technical Field

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

[0002] Range hoods have become one of the indispensable kitchen appliances in modern families. Range hoods work based on the principle of fluid dynamics. They absorb and exhaust oil smoke through a fan system installed inside the range hood, and use a filter to filter some grease particles. The fan system usually consists of a collector, a volute, an impeller, a motor and other parts. As an important component of the fan, the collector is installed at the air inlet of the fan. The structure is in the shape of a ring, generally including a mounting part, a radial guide part and an axial guide part. Its function is to ensure that the gas enters the impeller smoothly and evenly, reduce flow losses and improve the efficiency of the fan. When the impeller rotates, negative pressure suction is generated in the center of the fan, sucking the oil smoke under the range hood into the fan, and after being accelerated by the fan, it is collected by the volute and guided to be discharged outdoors.

[0003] Existing range hood fan systems are all fixed on the top rear plate assembly or the fan frame assembly. In order to conform to the rising trajectory of the oil fume airflow and help improve the oil fume extraction effect, the fan is set at an angle. For example, the Chinese invention patent application with patent number CN201610588598.X (application publication number CN106051870A) discloses "A top-suction and side-suction hybrid range hood". In this patent, the air inlet of the fan is at a certain angle to the vertical direction. Since the overall tilted arrangement of the fan system reduces the turning radius of the airflow on one side, the air inlet channel on the other side is often reduced. On the other hand, the air intake volume of the range hood is different under different working conditions, and there are different requirements for the inclination angle of the volute and the relative position of the volute in the fan frame. The single inclination angle of the volute cannot meet the requirements of different working conditions of the range hood.

[0004] Therefore, the existing fan system for range hoods needs further improvement. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a fan system for a range hood that can specifically adjust the inclination angle of the cover plate where the air inlet is located according to different operating conditions, thereby improving the air intake efficiency, in response to the current status of the existing technology.

[0006] The second technical problem to be solved by the present invention is to provide a range hood that can specifically adjust the inclination angle of the cover plate where the air inlet of the fan system is located according to the operating conditions of the fan system, thereby improving the air intake efficiency, in response to the current status of the existing technology.

[0007] The third technical problem to be solved by the present invention is to provide a control method for a range hood that, in response to the current status of the prior art, specifically adjusts the inclination angle of the cover plate where the air inlet of the fan system is located according to the operating conditions of the fan system, thereby improving the air intake efficiency.

[0008] The technical solution adopted by the present invention to solve the first technical problem is: a fan system for a range hood, comprising:

[0009] The volute comprises two cover plates arranged opposite to each other and an annular wall connected between the two cover plates, at least one of the cover plates is provided with an air inlet, and two ends of the annular wall and the two cover plates define an air outlet;

[0010] An impeller is disposed in the volute, and the rotation axis of the impeller is denoted as a first axis;

[0011] The cover plate has a first side portion adjacent to the air outlet and a second side portion away from the air outlet. At least one cover plate includes at least two plate bodies connected in sequence from the first side portion to the second side portion. Each of the plate bodies can be independently rotatably connected to the annular wall in an angle-adjustable manner relative to a plane perpendicular to the first axis of the impeller.

[0012] Generally, the cover plate can be formed by splicing two or more plates. In order to facilitate processing and assembly and to facilitate accurate control of the inclination angle of each plate, the cover plate includes a first plate adjacent to the air outlet and a second plate away from the air outlet. The first plate and the second plate are connected in sequence, and the air inlet is defined at the connection between the two. It is conceivable that the entire air inlet can also be provided only on the first plate.

[0013] In order to adapt to different wind volume conditions, the angle formed by the intersection of the first plate and the plane perpendicular to the first axis of the impeller is recorded as α, and the angle formed by the intersection of the second plate and the plane perpendicular to the first axis of the impeller is recorded as β. The first plate and the second plate can be driven by a driving mechanism to have at least a first state, a second state and a third state:

[0014] In the first state, the first plate body gradually tilts toward the outside of the volute from the second side portion to the first side portion of the cover plate, and the second plate body is substantially parallel to a plane perpendicular to the first axis of the impeller or gradually tilts toward the inside of the volute from the first side portion to the second side portion of the cover plate, wherein α>β≥0°;

[0015] In the second state, the first plate is substantially parallel to a plane perpendicular to the first axis of the impeller, and the second plate is gradually inclined toward the inside of the volute from the first side portion to the second side portion of the cover plate, wherein β>α≥0°;

[0016] In the third state, the first plate body gradually tilts toward the inside of the volute from the second side portion to the first side portion of the cover plate, and the second plate body gradually tilts toward the inside of the volute from the first side portion to the second side portion of the cover plate.

[0017] The first state mentioned above is suitable for the fan in a high air volume working state, the second state is suitable for the fan in a medium air volume working state, and the third state is suitable for the fan in a small air volume working state. The first plate body (i.e., the upper half) of the cover body is inclined at a large angle toward the outer side of the volute to ensure a larger volute outlet flow area, and the second plate body (i.e., the lower half) is inclined at a small angle or even vertically toward the inner side of the volute to ensure that there is enough flow space at the lower part of the volute. When the high back pressure resistance air volume is low, the upper half is vertical or even inclined toward the inner side of the volute, compressing the volute outlet flow area to match the current flow rate and reducing back mixing under high back pressure. The lower half is inclined at a large angle toward the inner side of the volute to compress the flow area at the bottom of the volute and strengthen the wall-attached flow guiding effect.

[0018] In order to realize the rotational connection between the first plate body and the second plate body and the annular wall, the annular wall has a first pin shaft which is basically parallel to the plane where the air outlet is located, and the opposite side edges of the first plate body and the second plate body are both rotationally connected to the first pin shaft.

[0019] In order to ensure the sealing between the first plate body and the second plate body and the annular wall during relative deflection and reduce gas leakage problems, the periphery of the first plate body and the corresponding part of the periphery of the annular wall are connected by a first flexible member, and the periphery of the second plate body and the corresponding part of the periphery of the annular wall are connected by a second flexible member.

[0020] In order to avoid smoke leakage at the air inlet, the air outlet of the volute is also provided with a connecting frame plate that is basically flush with the plane where the air outlet is located, and the first plate body is connected to the connecting frame plate on the side corresponding to the air outlet through a third flexible part.

[0021] As another preferred method for achieving sealing between the first plate body and the second plate body and the annular wall during relative deflection, the outer peripheral edge of the first plate body has a first flange bent and extended toward the annular wall, the annular wall has a first concave slot corresponding to the first flange, the first flange is inserted into the first slot and is in sealing contact with the first slot;

[0022] The outer periphery of the second plate body has a second flange bent and extended toward the annular wall, and the annular wall has a concave second slot corresponding to the second flange. The second flange is inserted in the second slot and is in sealing contact with the second slot.

[0023] In order to avoid the problem of smoke leakage at the air inlet, the air outlet of the volute is also provided with a connecting frame plate that is basically flush with the plane where the air outlet is located, and the first plate body is adjacent to the air outlet and is also provided with an auxiliary connecting plate between the connecting frame plate. The auxiliary connecting plate has a first side edge and a second side edge relative to each other, the first side edge is hinged on the connecting frame plate, and the second side edge is slidably connected to the outer wall surface of the first plate body.

[0024] In order to achieve the purpose of guiding the airflow at the air inlet, it also includes a collector arranged at the air inlet of the volute, the collector includes a first arc-shaped guide ring connected to the first plate body and a second arc-shaped guide ring arranged on the second plate body, the first arc-shaped guide ring and the second arc-shaped guide ring are connected by a fourth flexible member.

[0025] The provision of the fourth flexible member can ensure that no gap is generated between the first arc-shaped guide ring and the second arc-shaped guide ring due to relative deflection, thereby reducing airflow leakage and noise problems at this location.

[0026] The technical solution adopted by the present invention to solve the second technical problem is: a range hood, characterized in that it includes a casing and a fan system as described above, the fan system is arranged in the casing, and a smoke inlet duct for smoke to pass from bottom to top is formed between the cover plate of the volute and the side wall of the casing, the range hood also includes a status detection device for detecting the operating status of the fan system, the status detection device and the drive mechanism are electrically connected to the control system of the range hood, and the control system controls the action of the drive mechanism according to the received fan operating status signal to drive the various plates of the cover plate to deflect to an angle matching the fan operating status.

[0027] The technical solution adopted by the present invention to solve the third technical problem is: a control method for a range hood, comprising the following steps:

[0028] S1, start the range hood;

[0029] S2, the state detection device obtains the operating state information of the fan, determines the current air volume state of the fan system, and transmits it to the control system;

[0030] S3, when the state detection device detects that the fan is currently in a low air volume condition, the driving mechanism is activated to adjust the first plate body and the second plate body of the cover plate to deflect to an angle corresponding to the third state;

[0031] When the state detection device detects that the fan is currently in a medium air volume condition, the driving mechanism is activated to adjust the first plate body and the second plate body of the cover plate to deflect to an angle corresponding to the second state;

[0032] When the state detection device detects that the fan is currently in a high air volume condition, the driving mechanism is activated to adjust the first plate body and the second plate body of the cover plate to deflect to an angle corresponding to the first state.

[0033] In order to obtain the operating status of the fan system, the status detection device is at least one of a wind speed sensor, a wind pressure sensor, and a speed sensor for detecting the speed of the fan system.

[0034] Of course, it is conceivable that the detection working condition parameters can be any parameters that can characterize the operating conditions, such as wind speed, outlet static pressure, fan speed, power, and electrical parameters fed back by the power board, or a combination of detections. For example, wind speed detection can be performed by setting a wind speed probe at the fan outlet end (upper end of the air outlet hood), outlet static pressure can be measured by setting a pressure probe at the fan outlet end, fan speed can be measured and fed back by a Hall sensor, electromagnetic sensor, etc. set on the impeller or motor, and motor power and power board electrical parameters can obtain corresponding parameter values ​​by setting sensors on the power board.

[0035] Compared with the prior art, the advantages of the present invention are as follows: the cover plate of the volute is set as a plurality of plates that can be tilted and moved in sections, and the tilt angle can be adjusted independently according to the different flow characteristics in the air duct of the range hood and the upper and lower areas inside the volute (the upper area of ​​the volute is mainly used to control the outlet airflow and increase the air outlet area, and the lower area mainly affects the guidance of the airflow at the bottom of the outer side of the volute and the internal airflow control). The volute cover is set at a certain angle, and the airflow entering the fan system is mainly concentrated in the lower part. The lower plate corresponding to the cover can be tilted at a certain angle to the outside of the volute. Based on this feature, the turning radius of the airflow when entering the fan can be reduced for the inlet airflow, thereby reducing the airflow resistance. Similarly, the cover plate tilt adjustment of the upper area of ​​the volute cover can change the outlet area of ​​the volute. Compared with the non-tilted vertical cover, the outlet area can be increased or reduced, which is conducive to smoother discharge of the airflow at large flow rates, and to achieve the purpose of preventing airflow from mixing under high back pressure resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the three-dimensional structure of the range hood according to Embodiment 1 of the present invention (the front side panel of the housing is omitted);

[0037] Figure 2 It is a front view of the range hood according to Embodiment 1 of the present invention;

[0038] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0039] Figure 4 This is a schematic diagram of the three-dimensional structure of the upper part of the range hood of Example 1 of the present invention (showing the fan system);

[0040] Figure 5 It is a front view of the fan system of Example 1 of the present invention (the motor and impeller are omitted);

[0041] Figure 6 for Figure 5 Cross-sectional view at AA (the cover plate is in the first state);

[0042] Figure 7 for Figure 5 Cross-sectional view at AA (the cover plate is in a vertical state as a whole);

[0043] Figure 8 for Figure 5 Cross-sectional view at the middle BB (the cover plate is in a vertical state as a whole);

[0044] Fig. 9 It is a vertical cross-sectional view of the fan system of embodiment 2 of the present invention.

[0045] Fig.10 Schematic diagram of the structure of the volute cover plate in the first state (large air volume condition) of Example 2 of the present invention;

[0046] Fig.11 Schematic diagram of the structure of the volute cover plate in the second state of embodiment 2 of the present invention (medium air volume condition);

[0047] Fig.12 This is a schematic structural diagram of the volute cover plate of Example 2 of the present invention in the third state (small air volume condition). DETAILED DESCRIPTION

[0048] The present invention is further described in detail below with reference to the accompanying drawings.

[0049] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0050] Example 1

[0051] See also Figure 1-Figure 8A fan system for a range hood includes a volute 10, an impeller 30, a motor 32, and a collector 50. The impeller 30 is disposed in the volute 10 and driven to rotate by the motor 32. The rotation axis of the impeller is recorded as a first axis 31. The volute 10 is provided with an air inlet 13. The collector 50 is disposed at the air inlet 13 of the volute 10 to guide the airflow into the impeller 30.

[0052] The volute 10 includes two oppositely disposed cover plates 11 and an annular wall 12 connected between the two cover plates 11, wherein an air inlet 13 is provided on the cover plate 11, and the air inlet 13 is opposite to the end of the impeller 30. The two ends of the annular wall 12 and the two cover plates 11 jointly define an air outlet 14 for air flow to flow out.

[0053] The collector 50 includes a guide portion 51 and an annular mounting portion 52 connected to the outside of the guide plate, and the annular mounting portion 52 can be attached to the front side of the cover plate 11 of the volute 10 and fixed by a locking member. The guide portion 51 generally includes a radial guide portion and an axial guide portion, wherein the axial guide portion is connected to the inner side of the radial guide portion and extends toward the inside of the volute 10. The collector 50 is generally circular or elliptical.

[0054] The cover plate 11 has a first side portion 11a adjacent to the air outlet 14 (when the fan is placed vertically, the air outlet 14 faces upward, and the first side portion 11a of the cover plate 11 can be understood as the upper portion) and a second side portion 11b away from the air outlet 14 (i.e., the lower portion of the cover plate 11). At least one cover plate 11 includes at least two plate bodies connected in sequence from the first side portion 11a to the second side portion 11b, and each plate body can be independently rotatably connected to the annular wall 12 in an angle-adjustable manner relative to a plane perpendicular to the first axis 31 of the impeller 30.

[0055] Generally, the cover plate 11 can be formed by splicing two or more plates. In order to facilitate processing and assembly and to facilitate accurate control of the inclination angle of each plate, Figure 1 Two plates are shown, that is, the cover plate 11 includes a first plate 111 adjacent to the air outlet 14 and a second plate 112 away from the air outlet 14. The first plate 111 and the second plate 112 are connected in sequence in the up and down directions, and define an air inlet 13 at the connection between the two.

[0056] Combination Fig.10, the angle formed by the intersection of the first plate body 111 and the plane perpendicular to the first axis 31 of the impeller 30 is recorded as α, and the angle formed by the intersection of the second plate body 112 and the plane perpendicular to the first axis 31 of the impeller 30 is recorded as β. The first plate body 111 and the second plate body 112 can be driven by a driving mechanism and have at least a first state, a second state and a third state. Among them, the driving mechanism includes a first driving mechanism 41 and a second driving mechanism 42 that act independently, the first driving mechanism 41 is connected to the first plate body 111, and the second driving mechanism 42 is connected to the second plate body 112. Specifically, the first driving mechanism 41 and the second driving mechanism 42 are preferably electric push rods.

[0057] See also Fig.10 In the first state, the first plate 111 gradually tilts toward the outside of the volute 10 from the second side 11b of the cover plate 11 to the first side 11a, and the second plate 112 is substantially parallel to a plane perpendicular to the first axis 31 of the impeller 30 or gradually tilts toward the inside of the volute 10 from the first side 11a of the cover plate 11 to the second side 11b, wherein α>β≥0°. Fig.11 As shown, in the second state, the first plate 111 is substantially parallel to a plane perpendicular to the first axis 31 of the impeller 30, and the second plate 112 gradually inclines toward the inside of the volute 10 from the first side portion 11a to the second side portion 11b of the cover plate 11, wherein β>α≥0°. Fig.12 As shown, in the third state, the first plate body 111 gradually tilts toward the inside of the volute 10 from the second side portion 11b of the cover plate 11 to the first side portion 11a, and the second plate body 112 gradually tilts toward the inside of the volute 10 from the first side portion 11a of the cover plate 11 to the second side portion 11b.

[0058] The first state mentioned above is suitable for the fan in a high air volume working state, the second state is suitable for the fan in a medium air volume working state, and the third state is suitable for the fan in a low air volume working state. The first plate 111 (i.e., the upper half) of the cover is inclined at a large angle toward the outside of the volute 10 to ensure a larger outlet flow area of ​​the volute 10, and the second plate 112 (i.e., the lower half) is inclined at a small angle or even vertically toward the inside of the volute 10 to ensure that there is enough flow space at the bottom of the volute 10. When the high back pressure resistance air volume is low, the upper half is vertical or even inclined toward the inside of the volute 10, compressing the outlet flow area of ​​the volute 10 to match the flow at the moment and reducing back mixing under high back pressure. The lower half is inclined at a large angle toward the inside of the volute 10 to compress the bottom flow area of ​​the volute 10 and strengthen the wall-attached flow guiding effect.

[0059] The annular wall 12 has a first pin 18 substantially parallel to the plane where the air outlet 14 is located, and the first pin 18 is substantially horizontally extending. The first plate 111 has a first connection portion 1110 for connecting to the first pin 18, and the second plate 112 has a second connection portion for connecting to the first pin 18, wherein the first connection portion 1110 of the first plate 111 and the second connection portion 1120 of the second plate 112 are both rotatably connected to the first pin 18, and the two are staggered in the horizontal direction.

[0060] The outer periphery of the first plate body 111 has a first flange 1111 bent and extended toward the annular wall 12, and the annular wall 12 has a concave first slot 121 corresponding to the first flange 1111, and the first flange 1111 is inserted in the first slot 121 and is in sealing contact with the first slot 121; the outer periphery of the second plate body 112 has a second flange 1121 bent and extended toward the annular wall 12, and the annular wall 12 has a concave second slot 123 corresponding to the second flange 1121, and the second flange 1121 is inserted in the second slot 123 and is in sealing contact with the second slot 123. Generally speaking, during the deflection of the cover plate 11, the first flange 1111 of the first plate body 111 and the inner wall of the first slot 121 of the annular wall 12, as well as the second flange 1121 of the second plate body 112 and the inner wall of the second slot 123 of the annular wall 12 can be sealed through rigid contact. However, in order to further improve the sealing between the two components and reduce the problem of gas leakage, a sealing member 122 (such as a rubber material) is embedded in the first slot 121 and the second slot 123. When the first flange 1111 of the first plate body 111 is inserted into the first slot 121 (the same is true for the second flange 1121 of the second plate body 112 being inserted into the second slot 123), the sealing member 122 can always be squeezed to achieve sealing here.

[0061] Since the first plate body 111 will have a gap with the air outlet plate 63 at the edge of the air outlet 14 when the first plate body 111 is deflected, in order to prevent smoke from leaking at this point, the air outlet 14 of the volute 10 of this embodiment is also provided with a connecting frame plate 16 that is substantially flush with the plane where the air outlet 14 is located. An auxiliary connecting plate 15 is also provided between the first plate body 111 adjacent to the air outlet 14 and the connecting frame plate 16, and the auxiliary connecting plate 15 has a first side edge 151 and a second side edge 152 that are opposite to each other, wherein the first side edge 151 is adjacent to (adheres to) the bottom surface of the connecting frame plate 16 or the bottom surface of the air outlet plate 63, and is hinged to the connecting frame plate 16 through a rotating shaft 1510. The second side edge 152 is slidably connected to the outer wall surface of the first plate body 111. Specifically, a fixing frame 17 is provided on the outer wall surface of the first plate body 111 adjacent to the air outlet 14, and the fixing frame 17 has two slide grooves 170 arranged opposite to each other, and the two slide grooves 170 extend vertically. The second side edge 152 of the auxiliary connecting plate 15 has a second pin shaft 1520 extending in reverse and located on the same straight line, and the second side edge 152 of the auxiliary connecting plate 15 is correspondingly slidably constrained in the two slide grooves 170 by the two second pin shafts 1520.

[0062] During the deflection process of the cover plate 11, the second side edge 152 of the auxiliary connecting plate 15 can move up and down along the cover plate 11, and the first side edge 151 of the auxiliary connecting plate 15 can fit as closely as possible with the connecting frame plate 16 (the gap between the two can also be filled by the rubber seal 122), and the second side edge 152 can also fit as closely as possible with the outer wall surface of the cover plate 11, thereby reducing the leakage of smoke at the air outlet 14.

[0063] The collector 50 is arranged at the air inlet 13 of the cover plate 11 of the volute 10. In order to adapt to the partitionable deflectable cover plate 11, the collector 50 includes a first arc-shaped guide ring 501 connected to the first plate body 111 and a second arc-shaped guide ring 502 arranged on the second plate body 112. The first arc-shaped guide ring 501 and the second arc-shaped guide ring 502 are connected by a fourth flexible member 24. The fourth flexible member 24 can be made of a rubber material that can be retracted and deformed. The setting of the fourth flexible member 24 can ensure that there is no gap between the first arc-shaped guide ring 501 and the second arc-shaped guide ring 502 due to relative deflection, thereby reducing airflow leakage and noise problems here.

[0064] See also Figure 1, this embodiment also relates to a range hood, comprising a casing 60 and the above-mentioned centrifugal fan. The casing 60 comprises a fan frame 61 and a smoke collecting hood 62 connected to the bottom of the fan frame 61, wherein the centrifugal fan is arranged in the fan frame 61 and fixed relative to the fan frame 61. The bottom of the smoke collecting hood 62 is provided with a smoke inlet (not shown) for oil smoke to enter therein. The top of the fan frame 61 is provided with an air outlet plate 63, and an opening 631 is formed on the air outlet plate 63. The connecting frame plate 16 at the air outlet 14 of the volute 10 is connected to the circumference of the opening 631 of the air outlet plate 63. A smoke inlet duct 64 for smoke to pass from bottom to top is formed between the cover plate 11 of the volute 10 and the side wall of the casing 60.

[0065] The range hood also includes a state detection device for detecting the operating state of the fan system. The state detection device is at least one of a wind speed sensor, a wind pressure sensor, and a speed sensor for detecting the speed of the fan system. The state detection device and the drive mechanism of this embodiment are electrically connected to the control system of the range hood. The control system controls the drive mechanism to move according to the received fan operating state signal to drive the plate bodies of the cover plate 11 to deflect to an angle matching the fan operating state. Of course, it is conceivable that the detection operating condition parameters can be any parameters that can characterize the operating condition, such as wind speed, outlet static pressure, fan speed, power, and electrical parameters fed back by the power board, and can also be combined for detection. For example, the wind speed detection can be detected by setting a wind speed probe 72 at the fan outlet end (the upper end of the air outlet hood 71), the outlet static pressure can be measured by setting a pressure probe at the fan outlet end, the fan speed can be measured and fed back by a Hall sensor, an electromagnetic sensor, etc. set on the impeller 30 or the motor 32, and the motor 32 power and the power board electrical parameters can obtain the corresponding parameter values ​​by setting sensors on the power board.

[0066] A control method for a range hood comprises the following steps:

[0067] S1, start the range hood;

[0068] S2, the state detection device obtains the operating state information of the fan, determines the current air volume state of the fan system, and transmits it to the control system;

[0069] S3. When the state detection device detects that the fan is currently in a low air volume condition, the driving mechanism is activated to adjust the first plate body 111 and the second plate body 112 of the cover plate 11 to deflect to an angle corresponding to the third state;

[0070] When the state detection device detects that the fan is currently in a medium air volume condition, the driving mechanism is activated to adjust the first plate body 111 and the second plate body 112 of the cover plate 11 to deflect to an angle corresponding to the second state;

[0071] When the state detection device detects that the fan is currently in a high air volume condition, the driving mechanism is activated to adjust the first plate body 111 and the second plate body 112 of the cover plate 11 to deflect to an angle corresponding to the first state.

[0072] In this embodiment, the inclination angles of the first plate 111 and the second plate 112 correspond to different operating conditions of the centrifugal fan. For example, the range hood can be set to three flow intervals. Specifically, three flow intervals are set as reference intervals in the memory, namely, a small flow condition (Q≤8m 3 / min), medium flow condition ≤15m 3 / min), large flow conditions (Q>15m 3 / min). At the same time, three deflection positions of the first plate body 111 and the second plate body 112 are preset. In the first setting position, the first plate body 111 tilts from bottom to top toward the outside of the volute 10, and the tilt angle can be 2°, and the tilt angle of the second plate body 112 is 0° (that is, vertical setting); in the second setting position, the first plate body 111 tilts at an angle of 0° (that is, vertical setting), and the second plate body 112 tilts from top to bottom toward the inside of the volute 10, and the tilt angle is 1°; in the third setting position, the first plate body 111 tilts from bottom to top toward the inside of the volute 10, and the tilt angle can be 2°; the second plate body 112 tilts from top to bottom toward the inside of the volute 10, and the tilt angle is 2°. Of course, the above-mentioned tilt angle positions and sizes are only examples, and are not limited to these selected positions in actual use, and can be slightly adjusted according to actual working conditions.

[0073] The range hood is started, and the synchronous detection device starts the detection of working condition parameters;

[0074] The processor processes one or more detection signals and converts them into signal data comparable to the memory data, which is flow data in this example. When there are multiple detection signals, two signals are preferably weighted, Q=0.5Q1+0.5Q2.

[0075] Determine the current flow range. When it is in a low flow condition (Q≤8m 3 / min), transmits a signal to the controller, and the controller controls the first drive mechanism 41 and the second drive mechanism 42 to drive the first plate 111 and the second plate 112 to the third setting position; when it is in the medium flow condition (8<Q≤15m 3 / min)), a signal is transmitted to the controller, and the controller controls the first driving mechanism 41 and the second driving mechanism 42 to operate, driving the first plate 111 and the second plate 112 to be in the second set position; when in a large flow condition (Q>15m 3 / min), the controller controls the first driving mechanism 41 and the second driving mechanism 42 to operate, and drives the first plate body 111 and the second plate body 112 to be in the first set position.

[0076] Example 2

[0077] See also Figure 9-12 The difference between this embodiment and the first embodiment is that the periphery of the first plate 111 is connected to the corresponding part of the periphery of the annular wall 12 via the first flexible member 21, and the periphery of the second plate 112 is connected to the corresponding part of the periphery of the annular wall 12 via the second flexible member 22. The side of the first plate 111 corresponding to the air outlet 14 is connected to the connecting frame plate 16 via the third flexible member 23. Among them, the first flexible member 21, the second flexible member 22, and the third flexible member 23 can be made of rubber material. The opposite sides of the first flexible member 21 can be glued to the first plate body 111 and the annular wall 12, the opposite sides of the second flexible member 22 can be glued to the second plate body 112 and the annular wall 12, and the opposite sides of the third flexible member 23 can be glued to the air outlet 14 side of the first plate body 111 and the bottom wall of the connecting frame plate 16. During the rotation of the first plate body 111 and the second plate body 112, the first flexible member 21, the second flexible member 22 and the third flexible member 23 can be elastically stretched and contracted for compensation.

Claims

1. A fan system for a range hood, comprising: A volute (10) comprises two cover plates (11) arranged opposite to each other and an annular wall (12) connected between the two cover plates (11), at least one of the cover plates (11) being provided with an air inlet (13), and air outlets (14) being defined between two ends of the annular wall (12) and the two cover plates (11); An impeller (30) is disposed in the volute (10), and a rotation axis of the impeller (30) is denoted as a first axis (31); The invention is characterized in that: the cover plate (11) has a first side portion (11a) adjacent to the air outlet (14) and a second side portion (11b) away from the air outlet (14); at least one cover plate (11) comprises at least two plate bodies connected in sequence from the first side portion (11a) to the second side portion (11b); each of the plate bodies can be independently connected to the annular wall (12) in a rotatable manner relative to a plane perpendicular to the first axis (31) of the impeller (30) in an angle-adjustable manner; The cover plate (11) comprises a first plate body (111) adjacent to the air outlet (14) and a second plate body (112) away from the air outlet (14); the first plate body (111) and the second plate body (112) are connected in sequence, and the air inlet (13) is defined at the connection between the two; The angle formed by the intersection of the first plate body (111) and a plane perpendicular to the first axis (31) of the impeller (30) is denoted as α, and the angle formed by the intersection of the second plate body (112) and a plane perpendicular to the first axis (31) of the impeller (30) is denoted as β. The first plate body (111) and the second plate body (112) can be driven by a driving mechanism to have at least a first state, a second state and a third state: In a first state, the first plate body (111) gradually tilts toward the outside of the volute (10) from the second side portion (11b) of the cover plate (11) to the first side portion (11a), and the second plate body (112) is substantially parallel to a plane perpendicular to the first axis (31) of the impeller (30) or gradually tilts toward the inside of the volute (10) from the first side portion (11a) of the cover plate (11) to the second side portion (11b), wherein α>β≥0°; In the second state, the first plate body (111) is substantially parallel to a plane perpendicular to the first axis (31) of the impeller (30), and the second plate body (112) gradually inclines toward the inside of the volute (10) from the first side portion (11a) to the second side portion (11b) of the cover plate (11), wherein β>α≥0°; In the third state, the first plate body (111) gradually tilts toward the interior of the volute (10) from the second side portion (11b) of the cover plate (11) to the first side portion (11a), and the second plate body (112) gradually tilts toward the interior of the volute (10) from the first side portion (11a) of the cover plate (11) to the second side portion (11b).

2. The fan system for a range hood according to claim 1, characterized in that: The annular wall (12) has a first pin shaft (18) which is substantially parallel to the plane where the air outlet (14) is located, and the opposite side edges of the first plate body (111) and the second plate body (112) are both rotatably connected to the first pin shaft (18).

3. The fan system for a range hood according to claim 2, characterized in that: The periphery of the first plate body (111) is connected to a corresponding portion of the periphery of the annular wall (12) via a first flexible member (21), and the periphery of the second plate body (112) is connected to a corresponding portion of the periphery of the annular wall (12) via a second flexible member (22).

4. The fan system for a range hood according to claim 3, characterized in that: The air outlet (14) of the volute (10) is also provided with a connecting frame plate (16) which is substantially flush with the plane where the air outlet (14) is located, and the first plate body (111) is connected to the connecting frame plate (16) via a third flexible member (23) on the side corresponding to the air outlet (14).

5. The fan system for a range hood according to claim 1, characterized in that: The outer periphery of the first plate body (111) has a first flange (1111) bent and extended toward the annular wall (12); the annular wall (12) has a first recessed slot (121) corresponding to the first flange (1111); the first flange (1111) is inserted into the first slot (121) and is in sealing contact with the first slot (121); The outer peripheral edge of the second plate body (112) has a second flange (1121) bent and extended toward the annular wall (12); the annular wall (12) has a second recessed slot (123) corresponding to the second flange (1121); the second flange (1121) is inserted into the second slot (123) and is in sealing contact with the second slot (123).

6. The fan system for a range hood according to claim 5, characterized in that: The air outlet (14) of the volute (10) is also provided with a connecting frame plate (16) which is substantially flush with the plane where the air outlet (14) is located; an auxiliary connecting plate (15) is also provided between the first plate body (111) adjacent to the air outlet (14) and the connecting frame plate (16); the auxiliary connecting plate (15) has a first side edge (151) and a second side edge (152) which are opposite to each other; the first side edge (151) is hinged on the connecting frame plate (16); and the second side edge (152) is slidably connected to the outer wall surface of the first plate body (111).

7. The fan system for a range hood according to any one of claims 1 to 6, characterized in that: It also includes a collector (50) arranged at the air inlet (13) of the volute (10), the collector (50) including a first arc-shaped guide ring (501) connected to the first plate body (111) and a second arc-shaped guide ring (502) arranged on the second plate body (112), the first arc-shaped guide ring (501) and the second arc-shaped guide ring (502) being connected via a fourth flexible member (24).

8. A range hood, characterized in that: The range hood comprises a casing (60) and a fan system as claimed in any one of claims 1 to 7, wherein the fan system is arranged in the casing (60), and a smoke inlet duct (64) for smoke to pass from bottom to top is formed between the cover plate (11) of the volute (10) and the side wall of the casing (60), and the range hood also comprises a status detection device for detecting the operating status of the fan system, and the status detection device and the driving mechanism are electrically connected to the control system of the range hood, and the control system controls the driving mechanism to operate according to the received fan operating status signal to drive the various plates of the cover plate (11) to deflect to an angle matching the fan operating status.

9. A control method for a range hood as claimed in claim 8, characterized in that The following steps are involved: S1, start the range hood; S2, the state detection device obtains the operating state information of the fan, determines the current air volume state of the fan system, and transmits it to the control system; S3. When the state detection device detects that the fan is currently in a low air volume condition, the driving mechanism is activated to adjust the first plate body (111) and the second plate body (112) of the cover plate (11) to deflect to an angle corresponding to the third state; When the state detection device detects that the fan is currently in a medium air volume condition, the driving mechanism is activated to adjust the first plate body (111) and the second plate body (112) of the cover plate (11) to deflect to an angle corresponding to the second state; When the state detection device detects that the fan is currently in a high air volume condition, the drive mechanism is activated to adjust the first plate body (111) and the second plate body (112) of the cover plate (11) to deflect to an angle corresponding to the first state.

10. The control method of the range hood according to claim 9, characterized in that: The state detection device is at least one of a wind speed sensor, a wind pressure sensor, and a rotation speed sensor for detecting the rotation speed of the fan system.

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