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 and an annular wall, at least one cover plate being provided with an air inlet; an impeller, arranged in the volute, and its rotation axis being recorded as a first axis; a first driving mechanism, the power output end of which is connected to at least one cover plate, and the cover plate, under the action of the first driving mechanism, can deflect around the portion where it is partially connected to the annular wall, so that the cover plate is close to or away from the annular wall, thereby adjusting the angle between the plane where the air inlet on the cover plate is located and the plane perpendicular to the first axis of the impeller. The cover plate of the volute is tilted and adjustable relative to the annular wall, which can reduce the turning radius of the airflow when entering the air inlet of the fan, thereby reducing the airflow resistance. On the other hand, it also increases the outlet area of ​​the volute, which is conducive to the smooth discharge of the airflow at a large flow rate. Especially in the case of a large air volume, the inclined setting of the cover plate can also increase the air outlet area and improve the flow condition 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 air inlet of the fan system according to different operating conditions, thereby improving the air intake efficiency, in response to the current status of the prior art.

[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 air inlet of the fan system according to the operating conditions of the fan system, thereby improving the air intake efficiency, in response to the current status of the prior art.

[0007] The third technical problem to be solved by the present invention is to provide a range hood that, in response to the current status of the prior art, can not only perform targeted adjustment on the inclination angle of the air inlet of the fan system according to the operating conditions of the fan system, but also can adapt to the air intake flow and gap reflux characteristics under different working conditions, thereby effectively improving the aerodynamic performance of the fan system.

[0008] The fourth 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, can not only perform targeted adjustment on the inlet inclination angle of the fan system according to the operating conditions of the fan system, but also adapt to the air intake flow and gap reflux characteristics under different working conditions, thereby effectively improving the aerodynamic performance of the fan system.

[0009] The technical solution adopted by the present invention to solve the first technical problem is: a fan system for a range hood, comprising:

[0010] 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 being provided with an air inlet;

[0011] an impeller, disposed in the volute, and having a rotation axis denoted as a first axis;

[0012] The first driving mechanism has a power output end connected to at least one of the cover plates, and the cover plate can be deflected around the portion where it is partially connected to the annular wall under the action of the first driving mechanism, so that the cover plate is closer to or farther away from the annular wall, thereby adjusting the angle between the plane where the air inlet on the cover plate is located and the plane perpendicular to the first axis of the impeller.

[0013] In order to ensure the sealing between the cover plate and the annular wall during relative deflection and reduce gas leakage problems, the outer peripheral edge of the cover plate has a first flange bent and extended toward the annular wall, and the annular wall has a first concave slot corresponding to the first flange. The first flange is inserted in the first slot and is in sealing contact with the first slot.

[0014] Generally speaking, during the deflection process of the cover plate, the first flange and the inner wall of the first slot of the annular wall can also achieve sealing between the two through rigid contact. In order to further improve the sealing between the first flange and the first slot, a sealing member is embedded in the first slot, and the first flange of the cover plate is inserted into the first slot and contacts the sealing member.

[0015] For the convenience of processing, an air outlet is defined between the two ends of the annular wall and the two cover plates, and the cover plate has a first connection portion that is far away from the air outlet. The first connection portion of the cover plate is rotatably connected to the annular wall, and the extension length of the first flange gradually increases from the location of the first connection portion to the location of the air outlet of the volute. When the fan system is placed vertically, that is, when the air outlet is facing, the first connection portion of the volute cover plate is correspondingly located at the lower part.

[0016] Since the cover plate is deflected, a gap will be formed between the edge of the cover plate at the air outlet and the air outlet plate. In order to prevent smoke from leaking here, 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. The cover plate 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 cover plate. During the deflection process of the cover plate, the second side edge of the auxiliary connecting plate can move up and down along the cover plate, and the first side edge of the auxiliary connecting plate can fit the connecting frame plate as much as possible, and the second side edge can also fit the outer wall surface of the cover plate as much as possible, thereby reducing the problem of smoke leakage at the air outlet.

[0017] In order to achieve stable sliding of the second side of the auxiliary connecting plate relative to the cover plate and ensure that the cover plate can deflect smoothly relative to the annular wall, a fixing frame is provided on the outer wall surface of the cover plate adjacent to the air outlet, and the fixing frame has two relatively arranged sliding grooves. The second side of the auxiliary connecting plate has pins extending in opposite directions and located on the same straight line, and the two pins are correspondingly slidably constrained in the two sliding grooves.

[0018] As another preferred embodiment, in order to ensure the sealing between the cover plate and the annular wall during relative deflection and reduce the problem of gas leakage, the outer periphery of the cover plate is connected to the edge of the annular wall through a first flexible member.

[0019] Similarly, in order to avoid smoke leakage at the air inlet, an air outlet is defined between the two ends of the annular wall and the two cover plates, and a connecting frame plate that is basically flush with the plane where the air outlet is located is also provided at the air outlet, and the side of the cover plate corresponding to the air outlet is connected to the connecting frame plate through a second flexible member.

[0020] After the cover plate is deflected and tilted, the axial clearance between the collector at the air inlet of the cover plate and the impeller increases more as it approaches the outlet position, and the airflow angle changes from horizontal to a certain upward angle. In order to better improve the flow guiding effect of the collector, it is necessary to change the position of the collector. The fan system also includes a collector at the air inlet of the volute, and the collector is slidably constrained on the cover plate of the volute in a position-adjustable manner. When the collector moves, the distance between the center of the collector and the center of the air inlet of the cover plate can be changed.

[0021] The collector is slidingly constrained on the volute cover, and the position of the collector relative to the impeller axis can be adjusted according to the actual working conditions of the fan system. Therefore, for different working conditions of the fan system, on the one hand, targeted adjustments can be made through the deflection of the cover plate to achieve the purpose of smooth air intake. On the other hand, the gap between the cover plate deflection and the impeller end can be improved through radial movement adjustment of the collector, so as to adapt to the air intake flow and gap backflow characteristics under different working conditions, and effectively improve the aerodynamic performance of the fan system under different working conditions.

[0022] Generally speaking, the linear limiting structure between the collector and the cover plate can adopt a slide groove and pin matching structure, a guide rib groove matching structure, etc. In order to simplify the installation structure between the collector and the cover plate, the collector includes a guide part and an annular mounting part connected to the outside of the guide part, and the annular mounting part has at least two parallel strip limiting slide grooves. The cover plate is provided with a limiting pin at a position corresponding to the strip limiting slide groove, and each limiting pin is limited in the corresponding strip limiting slide groove.

[0023] In order to realize automatic adjustment of the movement process of the collector relative to the volute, a second driving mechanism is also included, which is fixed relative to the volute and has a power output end connected to the collector, thereby driving the collector to slide linearly relative to the volute.

[0024] The technical solution adopted by the present invention to solve the second technical problem is: a range hood, comprising a casing and a fan system as described above, wherein 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, and the range hood also includes a status detection device for detecting the operating status of the fan system, and the status detection device and a first drive mechanism are electrically connected to the control system of the range hood, and the control system controls the first drive mechanism to operate according to the received fan operating status signal to drive the cover plate to deflect, thereby adjusting the inclination angle of the plane where the air inlet on the cover plate is located.

[0025] The first driving mechanism can adopt various existing technologies such as a structure in which a motor cooperates with a transmission mechanism for linear sliding, an electric push rod, etc. In order to facilitate installation and save installation space, the casing includes a fan frame and an air outlet plate arranged on the top of the fan frame, and the air outlet plate has an opening. The air outlet of the volute is connected to the opening of the air outlet plate. The first driving mechanism includes a first electric push rod, which is arranged at the bottom of the air outlet plate, and its power output shaft is rotatably connected to the cover plate.

[0026] The technical solution adopted by the present invention to solve the third technical problem is: a range hood, comprising a casing and the above-mentioned fan system, wherein the fan system is arranged in the casing, and the range hood also includes a status detection device for detecting the operating status of the fan system, and the status detection device, the first drive mechanism and the second drive mechanism are electrically connected to the control system of the range hood, and the control system controls the first drive mechanism to operate according to the received fan operating status signal to drive the cover plate to deflect to an inclination angle matching the fan operating status, and thereby controls the second drive mechanism to operate according to the received fan operating status signal to drive the collector to move to a position matching the fan operating status.

[0027] The technical solution adopted by the present invention to solve the fourth technical problem is: a control method for a range hood, characterized by 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. The control system controls the first driving mechanism to move, driving the cover plate to deflect to an inclination angle that matches the operating state of the fan; at the same time, the control system controls the second driving structure to move, driving the collector to move to a position that matches the operating state of the fan.

[0031] 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.

[0032] 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.

[0033] Compared with the prior art, the advantages of the present invention are as follows: the cover plate of the volute is tilted and adjustable relative to the ring wall, which can reduce the turning radius of the airflow when entering the fan inlet, thereby reducing the airflow resistance. On the other hand, it also increases the outlet area of ​​the volute, which is conducive to the smooth discharge of airflow at large flow rates. Especially in the case of large air volume, the inclined setting of the cover plate can also increase the air outlet area and improve the flow conditions inside the volute. In the preferred embodiment, the structural design of the collector slidingly constrained on the cover plate of the volute in an adjustable position can also compensate for the changes in the air inlet circle gap and the airflow incident direction caused by the tilting of the front cover by adjusting the position of the collector, so as to achieve the purpose of adapting to the air inlet flow and gap reflux characteristics under different working conditions, and improve the aerodynamic performance of the fan system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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);

[0035] Figure 2 It is a front view of the range hood according to Embodiment 1 of the present invention;

[0036] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0037] 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);

[0038] Figure 5 It is a front view of the fan system of Example 1 of the present invention (the motor and impeller are omitted);

[0039] Figure 6 for Figure 5 Sectional view at AA (the cover is in an inclined state);

[0040] Figure 7 for Figure 5 Sectional view at AA (the cover is in a vertical position);

[0041] Figure 8 for Figure 5Sectional view at the middle BB (the cover is in a vertical state);

[0042] Fig. 9 It is a vertical cross-sectional view of the fan system of embodiment 2 of the present invention. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below with reference to the accompanying drawings.

[0044] 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.

[0045] Example 1

[0046] See also Figure 1-Figure 8 A 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 volute 10 is provided with an air inlet 13, and the collector 50 is disposed at the air inlet 13 of the volute 10 to guide the airflow into the impeller 30.

[0047] 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.

[0048] See also Figure 6 The collector 50 includes a guide portion 51 and an annular mounting portion 52 connected to the outside of the guide portion 51, 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. The structure of the above-mentioned collector 50 is prior art and will not be repeated.

[0049] In this embodiment, at least one cover plate 11 of the volute 10 is rotatably connected to the annular wall 12 of the volute 10. Figure 3As shown, the bottom of the front cover plate 11 of the volute 10 (i.e., the first connection portion away from the air outlet 14) is rotatably connected to the bottom of the annular wall 12 via a hinge 18. Specifically, the front cover plate 11 is driven by the first driving mechanism 41 to move closer to or farther from the annular wall 12, thereby adjusting the angle between the plane where the air inlet 13 on the cover plate 11 is located and the plane perpendicular to the first axis 31 of the impeller 30. The first driving mechanism 41 uses an electric push rod fixed relative to the annular wall 12 of the volute 10, the output shaft of which extends forward and backward and is hinged to the upper wall surface of the front cover plate 11 of the volute 10. When the electric push rod is in motion, it can drive the cover plate 11 to deflect forward and backward.

[0050] Since the cover plate 11 of the volute 10 is generally higher, a smaller tilt angle can result in a larger change in the size of the air outlet 14 (ie, the top size). Therefore, the rotation angle γ of the cover plate 11 can be selected between 0-5 degrees, preferably 0-2 degrees.

[0051] The outer periphery of the cover plate 11 has a first flange 111 that bends and extends toward the annular wall 12, and the extension length of the first flange 111 gradually increases from bottom to top. When the fan system is placed vertically, that is, when the air outlet 14 faces upward, the first connection portion of the cover plate 11 of the volute 10 is located at the lower part. The peripheral edge of the annular wall 12 has a concave first slot 121 corresponding to the first flange 111, and the first flange 111 is inserted into the first slot 121 and is in sealing contact with the first slot 121. The depth of the first slot 121 is consistent with the extension length of the first flange 111.

[0052] Generally speaking, during the deflection process of the cover plate 11, the first flange 111 and the inner wall of the first slot 121 of the annular wall 12 can also achieve sealing between the two through rigid contact. However, in order to further improve the sealing between the first flange 111 and the first slot 121 and reduce the gas leakage problem, a sealing member 122 (such as a rubber material) is embedded in the first slot 121. When the first flange 111 of the cover plate 11 is inserted into the first slot 121 and deflected, the sealing member 122 can always be squeezed to achieve sealing here.

[0053] Since the cover plate 11 will have a gap with the air outlet plate 63 at the edge of the air outlet 14 when the cover plate 11 is deflected, in order to prevent smoke from leaking at this location, the air outlet 14 of the volute 10 of this embodiment is further 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 further provided between the cover plate 11 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 via a rotating shaft 1510. The second side edge 152 is slidably connected to the outer wall surface of the cover plate 11. Specifically, a fixing frame 17 is provided on the outer wall surface of the cover plate 11 adjacent to the air outlet 14, and the fixing frame 17 has two guide grooves 170 arranged opposite to each other, and the two guide grooves 170 extend vertically. The second side 152 of the auxiliary connecting plate 15 has a pin shaft 1520 extending in reverse and located on the same straight line, and the second side 152 of the auxiliary connecting plate 15 is correspondingly slidably constrained in the two guide grooves 170 by the two pin shafts 1520.

[0054] During the deflection of the cover plate 11, the auxiliary connecting plate 15 also rotates accordingly. Specifically, the second side 152 of the auxiliary connecting plate 15 can move up and down along the cover plate 11, and the first side 151 of the auxiliary connecting plate 15 can fit the connecting frame plate 16 as closely as possible (of course, the gap between the two can also be filled by the rubber seal 122), and the second side 152 can also fit the outer wall surface of the cover plate 11 as closely as possible, thereby reducing the leakage of smoke at the air outlet 14.

[0055] After the cover plate 11 is deflected and tilted, the axial clearance between the collector 50 at the air inlet 13 of the cover plate 11 and the impeller 30 increases more as it approaches the outlet position, and the airflow angle will change from a horizontal angle to a certain upward angle. For this reason, the collector 50 of the present embodiment is also slidably constrained on the cover plate 11 of the volute 10 in a position-adjustable manner. When the inclination angle of the cover plate 11 is adjusted, the position of the collector 50 on the cover plate 11 can also be adaptively adjusted along the cover plate 11 to change the distance between the center of the collector 50 and the center of the air inlet 13.

[0056] See also Figure 5A linear limiting structure for limiting the linear sliding of the current collector 50 relative to the cover plate 11 is provided between the current collector 50 and the cover plate 11. Specifically, a mounting hole is provided on the cover plate 11 of the volute 10, wherein a strip-shaped limiting sliding groove 521 is provided on the annular mounting portion 52 of the current collector 50 corresponding to the above-mentioned mounting hole, and the limiting pin 112 as a locking member can be fixed to the mounting hole of the cover plate 11 of the volute 10 through the strip-shaped limiting sliding groove 521 on the current collector 50, and then the current collector 50 is made immovable relative to the cover plate 11 of the volute 10 in the axial direction through nuts, rubber parts, etc., thereby achieving the purpose of firmly fitting with the cover plate 11 of the volute 10 and ensuring sealing.

[0057] like Figure 1 As shown, the annular mounting portion 52 of the collector 50 has four strip-shaped limiting slots 521 arranged in parallel in the extending direction. The slot width of the strip-shaped limiting slots 521 matches the outer diameter of the limiting pin shaft 1520, so that in the extending direction of the strip-shaped limiting slots 521, applying force to the collector 50 can make the collector 50 slide linearly relative to the volute 10. The above-mentioned limiting pins 112 and the strip-shaped limiting slots 521 together constitute the linear limiting structure of this embodiment.

[0058] The moving distance of the collector 50 should match the size of the centrifugal fan itself. In this embodiment, the inner diameter of the impeller 30 is denoted as D, and the maximum moving distance of the collector 50 is denoted as L, wherein 0.02D≤L≤0.08D.

[0059] In addition, since the vertical movement distance of the collector 50 relative to the volute 10 has a more obvious effect on the airflow guidance and noise reduction effect, the direction of the straight-line movement of the collector 50 needs to be reasonably designed, especially for the range hood (top-suction range hood) in which the centrifugal fan is vertically installed in the fan frame 61, the collector 50 guides the airflow flowing from bottom to top to the inside of the fan, thereby playing a guiding role. Among them, the gas near the lower area of ​​the fan air inlet 13 is not easy to enter the impeller 30 flow channel through a large flow turn. Under different air volume conditions, the height of the collector 50 has a greater impact on it. In this embodiment, the horizontal plane passing through the axis of the impeller 30 is recorded as M (see Figure 1 ), the straight line where the current collector 50 moves is denoted as N, wherein the angle between the straight line N and the plane M is denoted as θ, 30°≤θ≤150°, as Figure 1 In the figure, θ is 45°, while Figure 5 It is shown in FIG. 5 that the moving direction of the current collector 50 is vertical, that is, θ is 90°.

[0060] The cover plate 11 of the volute 10 is also provided with a second driving mechanism 42, which is preferably an electric push rod, and the end of the output shaft of the electric push rod is provided with a connecting plate, and correspondingly, the outer edge of the annular mounting portion 52 of the collector 50 has an outwardly bent flange 53, and the connecting plate is attached to the flange 53 of the collector 50 and fixed by screws. When the electric push rod is in motion, the collector 50 can be driven to slide linearly relative to the volute 10 along the length direction of the strip-shaped limiting slide groove 521.

[0061] The present 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 supplying oil smoke. 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 and the side wall of the casing 60.

[0062] The range hood further comprises a state detection device for detecting the operating state of the centrifugal fan, and the state detection device may be at least one of a wind speed sensor, a wind pressure sensor, and a speed sensor for detecting the speed of the centrifugal fan. Figure 1 As shown, an air outlet cover 71 is connected to the top of the fan frame 61, and a wind pressure sensor 72 for detecting the wind pressure there can be connected to the air outlet cover 71.

[0063] The status detection device, the first drive mechanism 41 and the second drive mechanism 42 are all electrically connected to the control system of the range hood. The control system controls the first drive mechanism 41 to operate according to the received fan operation status signal to drive the cover plate 11 to deflect to an inclination angle matching the fan operation status, and thereby controls the second drive mechanism 42 to operate according to the received fan operation status signal to drive the collector 50 to move to a position matching the fan operation status.

[0064] The state detection device of this embodiment is electrically connected to the control system of the range hood. During the operation of the range hood, the control system of the range hood can control the corresponding driving mechanism according to the received fan operation state signal (feedback by the state detection device), thereby driving the cover plate 11 to deflect to a position matching the fan operation state, and driving the collector 50 to move relative to the volute 10 to a position matching the fan operation state, thereby realizing that the range hood automatically adjusts the deflection angle of the cover plate 11 and the position of the collector 50 according to the real-time working condition of the centrifugal fan, so as to effectively reduce the air intake resistance, adapt to the air intake flow and gap backflow characteristics under different working conditions, and improve the aerodynamic performance under various use conditions.

[0065] The control system of the centrifugal fan of this embodiment includes a memory, a processor, a communication module, a controller, etc. The processor is used to process the signal transmitted by the state detection device into a parameter value that can be compared with the memory data. When there are more than one signal value, weighting is required after processing: for example, the flow converted by the rotation speed is Q1, and the flow converted by the wind speed is Q2. There will be a certain difference between Q1 and Q2. Especially when a sensor has a problem, the two difference values ​​will be aggravated. The weighted method can reduce the erroneous operation caused by sensor failure, that is, Q=mQ1+nQ2, m and n are weighting coefficients, m+n=1, preferably m=n=0.5. The processed data is compared with the reference interval on the memory, and the driving mechanism is controlled to move by the controller according to the comparison result. The more reference intervals there are, the more deflection angles of the cover plate 11 and the distance segments that the collector 50 needs to be adjusted, that is, one interval corresponds to a deflection angle of the cover plate 11 and an eccentric distance of the collector 50.

[0066] In this embodiment, the inclination angle of the volute 10 cover plate 11 and the moving position of the collector 50 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 the reference intervals in the memory, namely, the small flow condition (Q≤8m 3 / min), medium flow condition (8<Q≤15m 3 / min), large flow conditions (Q>15m 3 / min). At the same time, the inclination angle of the volute 10 cover plate 11 is also preset at three positions, and the set positions of the collector 50 during the movement process also correspond to three.

[0067] In the first setting position, the angle between the front cover of the volute 10 (that is, the plane where the air inlet 13 is located) and the vertical plane perpendicular to the first axis 31 of the impeller 30 is relatively large, such as 2 degrees. Correspondingly, the collector 50 is arranged downward relative to the center of the air inlet 13, such as the distance between the center of the collector 50 and the center of the air inlet 13 can be 3 mm (the position of the collector 50 is recorded as position A1); in the second setting position, the angle between the front cover of the volute 10 (that is, the plane where the air inlet 13 is located) and the vertical plane perpendicular to the first axis 31 of the impeller 30 is relatively large. The angle becomes relatively smaller, such as 1 degree, and correspondingly, the collector 50 is also set lower relative to the center of the air inlet 13, such as the distance between the center of the collector 50 and the center of the air inlet 13 can be 1.5 mm (the position of the collector 50 is recorded as position A2); in the third set position, the front cover of the volute 10 (that is, the plane where the air inlet 13 is located) is parallel to the vertical plane perpendicular to the first axis 31 of the impeller 30, and correspondingly, the center of the collector 50 is basically coincident with the center of the air inlet 13 in the front-to-back direction (the position of the collector 50 is recorded as position A3).

[0068] The control method of the range hood comprises the following steps:

[0069] S1, start the range hood;

[0070] 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, wherein the processor of the control system processes one or more detection signals and converts them into signal data comparable to the memory data, which is flow data in this embodiment. When there are multiple detection signals, two signals are preferably weighted, Q=0.5Q1+0.5Q2;

[0071] S3, determine the interval of the current flow, when it is in a small flow condition (Q≤8m 3 / min), a signal is transmitted to the control system, and the control system controls the first driving mechanism 41 to move, driving the volute 10 cover plate 11 to deflect to the third setting position mentioned above, and the second driving mechanism 42 drives the collector 50 to move to position A3; when it is in the medium flow condition (8<Q≤15m 3 / min), a signal is transmitted to the control system, and the control system controls the first driving mechanism 41 to move, driving the volute 10 cover plate 11 to move to the second set position mentioned above, and the second driving mechanism 42 drives the collector 50 to move to position A2; when it is in a large flow condition (Q>15m 3 / min), transmits a signal to the control system, and the control system controls the first driving mechanism 41 to move, driving the volute 10 and the cover plate 11 to move to the above-mentioned first set position, and the second driving mechanism 42 drives the collector 50 to move to the position A1.

[0072] Example 2

[0073] See also Fig. 9 The difference between this embodiment and embodiment 1 is that the outer periphery of the cover plate 11 is connected to the edge of the annular wall 12 through the first flexible member 21, thereby achieving a seal between the cover plate 11 and the annular wall 12. The side of the cover plate 11 corresponding to the air outlet 14 is connected to the connecting frame plate 16 through the second flexible member 22, thereby achieving a seal between the cover plate 11 and the connecting frame plate 16 (air outlet plate 63). Among them, the first flexible member 21 and the second flexible member 22 can be made of rubber material, and the opposite sides of the first flexible member 21 can be glued to the cover plate 11 and the annular wall 12 of the volute 10, and the opposite sides of the second flexible member 22 can be glued to the air outlet 14 side of the cover plate 11 of the volute 10 and the connecting frame plate 16. During the rotation of the front cover of the volute 10, the first flexible member 21 and the second flexible member 22 can be elastically stretched 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), wherein at least one of the cover plates (11) is provided with an air inlet (13); An impeller (30) is disposed in the volute (10), and the rotation axis of the impeller is denoted as a first axis (31); The invention is characterized in that it also includes: A first driving mechanism (41), whose power output end is connected to at least one of the cover plates (11), and under the action of the first driving mechanism (41), the cover plate (11) can deflect around a portion where it is partially connected to the annular wall (12), so that the cover plate (11) moves closer to or farther away from the annular wall (12), thereby adjusting the angle between the plane where the air inlet (13) on the cover plate (11) is located and the plane perpendicular to the first axis (31) of the impeller (30); A flow collector (50) is arranged at the air inlet (13) of the volute (10), wherein the flow collector (50) is slidably constrained on the cover plate (11) of the volute (10) in a positionally adjustable manner; The second driving mechanism (42) is fixed relative to the volute (10), and its power output end is connected to the collector (50), thereby driving the collector (50) to slide linearly relative to the volute (10).

2. The fan system for a range hood according to claim 1, characterized in that: The outer peripheral edge of the cover plate (11) has a first flange (111) bent and extended toward the annular wall (12); the annular wall (12) has a first recessed slot (121) corresponding to the first flange (111); the first flange (111) is inserted into the first slot (121) and is in sealing contact with the first slot (121).

3. The fan system for a range hood according to claim 2, characterized in that: A sealing member (122) is embedded in the first slot (121); the first flange (111) of the cover plate (11) is inserted into the first slot (121) and contacts the sealing member (122).

4. The fan system for a range hood according to claim 2, characterized in that: An air outlet (14) is defined between the two ends of the annular wall (12) and the two cover plates (11); the cover plate (11) has a first connection portion which is away from the air outlet (14); the first connection portion of the cover plate (11) is rotatably connected to the annular wall (12); and the extension length of the first flange (111) gradually increases from the position of the first connection portion to the position of the air outlet (14) of the volute (10).

5. The fan system for a range hood according to claim 4, 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 cover plate (11) is also provided with an auxiliary connecting plate (15) between the air outlet (14) and the connecting frame plate (16), the auxiliary connecting plate (15) having a first side edge (151) and a second side edge (152) relative to each other, the first side edge (151) being hinged to the connecting frame plate (16), and the second side edge (152) being slidably connected to the outer wall surface of the cover plate (11).

6. The fan system for a range hood according to claim 5, characterized in that: A fixing frame (17) is provided on the outer wall surface of the cover plate (11) adjacent to the air outlet (14), and the fixing frame (17) has two guide grooves (170) arranged opposite to each other. The second side edge (152) of the auxiliary connecting plate (15) has a pin shaft (1520) extending in opposite directions and located on the same straight line, and the two pin shafts (1520) are correspondingly slidably constrained in the two guide grooves (170).

7. The fan system for a range hood according to claim 1, characterized in that: The outer periphery of the cover plate (11) is connected to the edge of the annular wall (12) via a first flexible member (21).

8. The fan system for a range hood according to claim 7, characterized in that: An air outlet (14) is defined between the two ends of the annular wall (12) and the two cover plates (11); a connecting frame plate (16) substantially flush with the plane where the air outlet (14) is located is also provided at the air outlet (14); and the side of the cover plate (11) corresponding to the air outlet (14) is connected to the connecting frame plate (16) via a second flexible member (22).

9. The fan system for a range hood according to claim 1, characterized in that: The collector (50) comprises a flow guide portion (51) and an annular mounting portion (52) connected to the outside of the flow guide portion (51); the annular mounting portion (52) is provided with at least two parallel strip-shaped limiting sliding grooves (521); the cover plate (11) is provided with limiting pins (112) at positions corresponding to the strip-shaped limiting sliding grooves (521); each limiting pin (112) is limited in the corresponding strip-shaped limiting sliding groove (521).

10. 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 8, 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 a first drive mechanism (41) are electrically connected to a control system of the range hood, and the control system controls the first drive mechanism (41) to operate according to a received fan operating status signal to drive the cover plate (11) to deflect, thereby adjusting the inclination angle of the plane where the air inlet (13) on the cover plate (11) is located.

11. The range hood according to claim 10, characterized in that: The casing (60) comprises a fan frame (61) and an air outlet (14) plate arranged on the top of the fan frame (61), the air outlet (14) plate having an opening (631), the air outlet (14) of the volute (10) being connected to the opening (631) of the air outlet (14) plate, the first driving mechanism (41) comprising a first electric push rod, the electric push rod being arranged at the bottom of the air outlet (14) plate, the power output shaft of which is rotatably connected to the cover plate (11).

12. 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 8, wherein the fan system is arranged in the casing (60), and the range hood further comprises a status detection device for detecting the operating status of the fan system, wherein the status detection device, a first drive mechanism (41) and a second drive mechanism (42) are electrically connected to a control system of the range hood, and the control system controls the first drive mechanism (41) to operate according to a received fan operating status signal so as to drive the cover plate (11) to deflect to an inclination angle matching the fan operating status, and thereby controls the second drive mechanism (42) to operate according to the received fan operating status signal so as to drive the collector (50) to move to a position matching the fan operating status.

13. A control method for a range hood as claimed in claim 12, 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, the control system controls the first driving mechanism (41) to operate, thereby driving the cover plate (11) to deflect to an inclination angle that matches the operating state of the fan; at the same time, the control system controls the second driving structure to operate, thereby driving the collector (50) to move to a position that matches the operating state of the fan.

14. The control method of the range hood according to claim 13, 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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