Centrifugal fan, range hood and control method of range hood

Abstract

The invention provides a centrifugal fan and a range hood, relates to the technical field of range hoods, and aims to optimize the volute structure of the range hood to a certain extent, reduce the wind noise during operation and improve the user experience. The centrifugal fan comprises a volute, a first flow guide mechanism and a second flow guide mechanism. A cutting part is formed at the bottom, opposite to the air outlet, of the volute and enables a first corner and a second corner to be formed in the volute. The first flow guide mechanism is located in the volute and arranged opposite to the first corner, and gas passing through the first corner is guided to the direction of the second corner. The second flow guide mechanism is located in the volute and arranged opposite to the second corner, and the gas passing through the second corner is guided to the direction of the air outlet.

Description

Technical Field

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

[0002] In household appliances, due to the limitation of size and space, especially in the design of range hoods, the size is miniaturized, so the volute of the multi-blade centrifugal fan is cut to meet the requirements of the narrow space inside the range hood. At present, the volute cutting on the market adopts straight-line cutting. The flow cross-sectional area of ​​the volute goes through a sudden process of first decreasing and then increasing, which makes the gas flowing out of the impeller flow separated seriously at the cutting position. If too much part is cut, the noise of the fan will increase and the aerodynamic performance will decrease.

[0003] Therefore, there is an urgent need to provide a centrifugal fan, a range hood and a control method for the range hood to solve the problems existing in the prior art to a certain extent. Summary of the invention

[0004] The object of the present invention is to provide a centrifugal fan, a range hood and a control method for the range hood, so as to optimize the range hood volute structure to a certain extent, reduce wind noise during operation, and improve user experience.

[0005] A centrifugal fan provided by the present invention includes a volute, a first flow guide mechanism and a second flow guide mechanism; a cutting portion is formed at the bottom position of the volute relative to the air outlet, and the cutting portion forms a first corner and a second corner in the volute; the first flow guide mechanism is located in the volute and is arranged relative to the first corner, and guides the gas passing through the first corner in the direction of the second corner; the second flow guide mechanism is located in the volute and is arranged relative to the second corner, and guides the gas passing through the second corner in the direction of the air outlet.

[0006] As an optional solution for the centrifugal fan, the first flow guide mechanism includes a first flow guide column and a first drive assembly, the second flow guide mechanism includes a second flow guide column and a second drive assembly, the output end of the first drive assembly is connected to one end of the first flow guide column, and the other end of the first flow guide column is rotatably connected to the volute; the output end of the second drive assembly is connected to one end of the second flow guide column, and the other end of the second flow guide column is rotatably connected to the volute; the first drive assembly and the second drive assembly are both arranged outside the volute.

[0007] As an optional solution for the centrifugal fan, the first drive assembly includes a first power member, a first transmission member and a first engaging member; the first power member is connected to the first transmission member, the first transmission member is engaged with the first engaging member, and the first engaging member is fixedly connected to one end of the first guide column.

[0008] As an optional solution for the centrifugal fan, the second drive assembly includes a second power member, a second transmission member and a second engaging member; the second power member is connected to the second transmission member, the second transmission member is engaged with the second engaging member, and the second engaging member is fixedly connected to one end of the second guide column.

[0009] As an optional solution for a centrifugal fan, the first guide column includes a first column and a first winding plate, and the second guide column includes a second column and a second winding plate; the first winding plate is wound on the first column, and the second winding plate is wound on the second column, and the winding direction of the first winding plate and the second winding plate is opposite to the rotation direction of the first guide column and the second guide column; a first guide groove is formed at a position corresponding to the first guide column in the volute, and a second guide groove is formed at a position corresponding to the second guide column; when the first guide column and the second guide column rotate in the winding direction of the first winding plate and the second winding plate, the edge of the first winding plate can enter the first guide groove and move along the first guide groove to unfold the first winding plate, and the edge of the second winding plate can enter the second guide groove and move along the second guide groove to unfold the second winding plate.

[0010] As an optional solution for a centrifugal fan, the centrifugal fan provided by the present invention also includes a first extension drive assembly and a second extension drive assembly; the first extension drive assembly and the second extension drive assembly are both located on the outer wall of the volute, and the first extension drive assembly is arranged corresponding to the first guide groove, and the second extension drive assembly is arranged corresponding to the second guide groove; a first connecting piece is provided at the end of the first winding plate, and a second connecting piece is provided at the end of the second winding plate, the first extension drive assembly includes a first telescopic drive and a first docking piece, and the second extension drive assembly includes a second telescopic drive and a second docking piece; the first docking piece can pass through the volute into the first guide groove and be connected to the first connecting piece, and the second docking piece can pass through the volute into the second guide groove and be connected to the second connecting piece, the first telescopic drive can drive the first docking piece forward, drive the first winding plate to unfold, and the second telescopic drive can drive the second docking piece forward, drive the second winding plate to unfold.

[0011] As an optional solution for the centrifugal fan, a first connecting piece is provided at both ends of the first winding plate, and a second connecting piece is provided at both ends of the second winding plate; the first extension drive assembly is arranged in a one-to-one correspondence with the first connecting piece, and the second extension drive assembly is arranged in a one-to-one correspondence with the second connecting piece.

[0012] As an optional solution for the centrifugal fan, the first connecting member and the second connecting member are both clamping holes, the first docking member and the second docking member are both clamping hooks, and the first telescopic drive and the second telescopic drive can drive the clamping hooks to approach the clamping holes and clamp them into the clamping holes.

[0013] As an optional solution for the centrifugal fan, the first connecting member and the second connecting member are both ferromagnets, the first docking member and the second docking member are both magnetic members, and the first telescopic drive and the second telescopic drive can drive the magnetic member to approach the ferromagnetic member so that the magnetic member and the ferromagnetic member are adsorbed.

[0014] Compared with the prior art, the centrifugal fan provided by the present invention has the following advantages:

[0015] The centrifugal fan provided by the present invention includes a volute, a first flow guide mechanism and a second flow guide mechanism; a cutting portion is formed at the bottom position of the volute relative to the air outlet, and the cutting portion forms a first corner and a second corner in the volute; the first flow guide mechanism is located in the volute and is arranged relative to the first corner, and guides the gas passing through the first corner in the direction of the second corner; the second flow guide mechanism is located in the volute and is arranged relative to the second corner, and guides the gas passing through the second corner in the direction of the air outlet.

[0016] From this analysis, it can be seen that by forming a cutting portion at the bottom position of the volute relative to the air outlet, the size of the overall centrifugal fan can be reduced, so that the centrifugal fan provided by the present application can be more compatible with miniaturized or small-sized range hoods. However, since the cutting portion will form a first corner and a second corner in the volute, the present application further adds a first guide mechanism at the first corner and a second guide mechanism at the second corner, so as to guide the airflow reaching the first corner and the second corner, thereby avoiding to a certain extent the problem of the airflow directly hitting the wall of the cutting portion to generate wind noise and colliding with other airflows to generate turbulence affecting the efficiency of the fan.

[0017] In addition, the present invention also provides a range hood, comprising the above-mentioned centrifugal fan.

[0018] The range hood using the centrifugal fan provided in the present application can not only better adapt to miniaturized range hoods, but also avoid the noise and poor air flow guidance effect caused by the cutting part to the fan to a certain extent, thereby improving the user experience to a certain extent.

[0019] The present invention also provides a control method for the above-mentioned range hood, comprising the following steps: step one, determining whether the range hood is in an on or off state; step two, starting or restoring the first air guide mechanism and the second air guide mechanism according to the on / off state of the range hood; step three, when in the on state, adjusting the rotation speed and direction of the first air guide column and the second air guide column and the unfolding and winding of the first winding plate and the second winding plate according to the gear position of the range hood.

[0020] As an optional scheme of the control method, in step two, starting or restoring the first air guide mechanism and the second air guide mechanism according to the on / off state of the range hood includes: when the range hood is turned off, the first telescopic drive and the second telescopic drive control the first winding plate and the second winding plate to retract to form the first air guide column and the second air guide column, and then stop the action.

[0021] As an optional scheme of the control method, in step three, the rotation speed and direction of the first guide column and the second guide column and the unfolding and winding of the first wrap plate and the second wrap plate are adjusted according to the gear position of the range hood, including: the range hood has a weak gear, a strong gear and a stir-fry gear; when in the weak gear, the first guide column or the first guide column and the second guide column both rotate; when in the strong gear, the first guide column rotates or the first guide column rotates and the second wrap plate unfolds; when in the stir-fry gear, the first guide column rotates and the second wrap plate unfolds or the first wrap plate and the second wrap plate both unfold. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A structural schematic diagram of the states of the first guide column and the second guide column in the centrifugal fan provided by an embodiment of the present invention;

[0024] Figure 2 A structural schematic diagram of the positions of the first guide column and the second guide column in the centrifugal fan provided in an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the structure of the first winding plate and the second winding plate in the centrifugal fan provided by an embodiment of the present invention;

[0026] Figure 4 A logic diagram of a range hood control method provided in an embodiment of the present invention.

[0027] In the figure: 1-volute; 101-front plate; 102-cutting part; 2-first guide column; 3-second guide column; 4-first transmission member; 5-first engaging member; 6-second transmission member; 7-second engaging member; 8-first winding plate; 9-second winding plate; 10-first telescopic drive; 11-second telescopic drive. DETAILED DESCRIPTION

[0028] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0029] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0033] For ease of description, spatial relative terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the drawings. Such spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings.

[0034] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0035] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0036] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application. In addition, the technical solutions between the various embodiments may be combined with each other, but must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be considered that the combination of such technical solutions does not exist and is not within the scope of protection required by the present application.

[0037] like Figure 1 As shown, the present invention provides a centrifugal fan, including a volute 1, a first flow guide mechanism and a second flow guide mechanism; a cutting portion 102 is formed at the bottom position of the volute 1 relative to the air outlet, and the cutting portion 102 forms a first corner and a second corner in the volute 1; the first flow guide mechanism is located in the volute 1 and is arranged relative to the first corner, and guides the gas passing through the first corner to the direction of the second corner; the second flow guide mechanism is located in the volute 1 and is arranged relative to the second corner, and guides the gas passing through the second corner to the direction of the air outlet.

[0038] Compared with the prior art, the centrifugal fan provided by the present invention has the following advantages:

[0039] The centrifugal fan provided by the present invention can reduce the size of the overall centrifugal fan by forming a cutting portion 102 at the bottom position of the volute 1 relative to the air outlet, so that the centrifugal fan provided by the present application can be more compatible with miniaturized or small-sized range hoods. However, since the cutting portion 102 will form a first corner and a second corner in the volute 1, the present application can guide the airflow reaching the first corner and the second corner by further adding a first guide mechanism at the first corner and a second guide mechanism at the second corner, thereby avoiding to a certain extent the problem of the airflow directly hitting the wall of the cutting portion 102 to generate wind noise and colliding with other airflows to generate turbulence that affects the efficiency of the fan.

[0040] It should be additionally explained here that the first flow guiding mechanism and the second flow guiding mechanism in the present application can directly adopt an arc-shaped flow guiding plate structure to guide the airflow at the first corner and the second corner.

[0041] In order to ensure the flow guiding effect, the number of the first flow guiding mechanism and the second flow guiding mechanism can be increased or decreased according to demand to ensure the flow guiding capacity.

[0042] Alternatively, if Figure 1 Combination Figure 2 As shown, the first flow guide mechanism in the present application includes a first flow guide column 2 and a first drive assembly, and the second flow guide mechanism includes a second flow guide column 3 and a second drive assembly, the output end of the first drive assembly is connected to one end of the first flow guide column 2, and the other end of the first flow guide column 2 is rotatably connected to the volute 1; the output end of the second drive assembly is connected to one end of the second flow guide column 3, and the other end of the second flow guide column 3 is rotatably connected to the volute 1; the first drive assembly and the second drive assembly are both arranged outside the volute 1.

[0043] In this embodiment, the first drive assembly and the second drive assembly can both be motors, and the output shafts of the motors are directly connected to the first guide column 2 and the second guide column 3 respectively, so as to drive the first guide column 2 and the second guide column 3 to rotate.

[0044] It can be understood that after the cutting portion 102 is formed in the volute 1, the internal space of the volute 1 is limited, and when the range hood is in low-power mode, the gas flow rate is small and the flow rate is low. The use of the above-mentioned guide plate structure will occupy more internal space of the volute 1, and the airflow will also be attenuated when passing through the guide plate, thereby affecting the gas flow rate of the fan in low-power mode, and further affecting the fan efficiency.

[0045] Therefore, the present application sets a first guide column 2 at the first corner and a second guide column 3 at the second corner, and drives the first guide column 2 to rotate by a first drive component, and drives the second guide column 3 to rotate by a second drive component, so as to utilize the Magrus principle to accelerate the airflow passing through the first guide column 2 and the second guide column 3, and then enable the airflow passing through the first guide column 2 to smoothly reach the second guide column 3, and reach the outlet through the second guide column 3 for discharge, thereby ensuring the smooth passage of small flow and low flow rate airflow in low power mode, thereby ensuring the efficiency of the fan.

[0046] Since the first guide column 2 and the second guide column 3 both extend in the thickness direction of the volute 1 , if the motor is directly connected to the first guide column 2 and the second guide column 3 for driving, the installation of the motor will make the overall fan size too large.

[0047] Consider this situation, Figure 1 Combination Figure 2 As shown, the first driving component in the present application includes a first power member, a first transmission member 4 and a first engaging member 5; the first power member is connected to the first transmission member 4, the first transmission member 4 is engaged with the first engaging member 5, and the first engaging member 5 is fixedly connected to one end of the first guide column 2.

[0048] The second driving assembly includes a second power member, a second transmission member 6 and a second engagement member 7; the second power member is connected to the second transmission member 6, the second transmission member 6 is engaged with the second engagement member 7, and the second engagement member 7 is fixedly connected to one end of the second guide column 3.

[0049] The first meshing member 5 and the second meshing member 7 in the present application are both gears, and the first power member and the second power member can be small motors, and the first power member and the second power member can be arranged on the front plate 101 of the volute 1 and fit with the front plate 101 to reduce the overall size of the centrifugal fan in the thickness direction. However, in this way, the output shafts of the first power member and the second power member are perpendicular to the first guide column 2 and the second guide column 3. Therefore, the first transmission member 4 and the second transmission member 6 in the present application can both include spur gears and bevel gears, and the corresponding meshing with the first meshing member 5 and the second meshing member 7 can be achieved through the spur gears, and the power reversal can be achieved through the bevel gears, so that the power of the first power member can be transmitted from the first transmission member 4 to the first meshing member 5, and the power of the second power member can be transmitted from the second transmission member 6 to the second meshing member 7.

[0050] Since the first engagement member 5 is connected to the first flow guiding column 2 and the second engagement member 7 is connected to the second flow guiding column 3 , the rotation of the first flow guiding column 2 and the second flow guiding column 3 can be realized.

[0051] It should be noted here that in the present application, a first drive assembly and a second drive assembly can be set at both ends of the first guide column 2 and the second guide column 3, so as to ensure that the force on the first guide column 2 and the second guide column 3 is evenly distributed to a certain extent, thereby ensuring the guide effect.

[0052] As an alternative to centrifugal fans, Figure 3 As shown, the first guide column 2 in the present application includes a first column and a first winding plate 8, and the second guide column 3 includes a second column and a second winding plate 9; the first winding plate 8 is wound on the first column, and the second winding plate 9 is wound on the second column, and the winding direction of the first winding plate 8 and the second winding plate 9 is opposite to the rotation direction of the first guide column 2 and the second guide column 3; a first guide groove is formed at a position corresponding to the first guide column 2 in the volute 1, and a second guide groove is formed at a position corresponding to the second guide column 3; when the first guide column 2 and the second guide column 3 rotate in the winding direction of the first winding plate 8 and the second winding plate 9, the edge of the first winding plate 8 can enter the first guide groove and move along the first guide groove to unfold the first winding plate 8, and the edge of the second winding plate 9 can enter the second guide groove and move along the second guide groove to unfold the second winding plate 9.

[0053] In this embodiment, the first guide column 2 in the present application includes a first column and a first winding plate 8, the second guide column 3 includes a second column and a second winding plate 9, the above-mentioned first engaging member 5 is connected to the end of the first column, and the second column is connected to the second engaging member 7 to realize the rotation of the first guide column 2 and the second guide column 3.

[0054] It can be understood that in order to ensure that the first winding plate 8 and the second winding plate 9 can be unfolded when needed, the ends of the first winding plate 8 and the second winding plate 9 in the present application are free ends, and by making the rotation direction of the first guide column 2 and the second guide column 3 opposite to the winding direction of the first winding plate 8 and the second winding plate 9, it is possible to ensure that the first winding plate 8 and the second winding plate 9 will not loosen and open when the fan is in a low-power state and rotates in the form of the first guide column 2 and the second guide column 3, thereby affecting the diversion effect.

[0055] Furthermore, in the present application, a first guide groove is formed in the volute 1 at a position corresponding to the first guide column 2, and a second guide groove is formed at a position corresponding to the second guide column 3. Since the winding direction of the first winding plate 8 and the second winding plate 9 is opposite to the rotation direction, the free ends of the first winding plate 8 and the second winding plate 9 will not enter the first guide groove and the second guide groove during rotation, thereby avoiding the unfolding of the first winding plate 8 and the second winding plate 9 under low power conditions.

[0056] When the range hood needs to operate at high power, the first power member and the second power member can be reversed first, thereby driving the first column and the second column to rotate in the opposite direction. Accordingly, during the rotation, the free end of the first winding plate 8 will enter the first guide groove, and the free end of the second winding plate 9 will enter the second guide groove, so that the first winding plate 8 and the second winding plate 9 are unfolded under the action of the first guide groove and the second guide groove.

[0057] It should be noted here that the first guide groove and the second guide groove in the present application are both arc-shaped grooves, so that the first winding plate 8 and the second winding plate 9 have a certain curvature after being unfolded, thereby being able to guide the airflow and ensure the flow-guiding capacity under high-power conditions.

[0058] Alternatively, if Figure 3 As shown, the centrifugal fan provided by the present invention also includes a first extension drive component and a second extension drive component; the first extension drive component and the second extension drive component are both located on the outer wall of the volute 1, and the first extension drive component is arranged corresponding to the first guide groove, and the second extension drive component is arranged corresponding to the second guide groove; a first connecting piece is provided at the end of the first winding plate 8, and a second connecting piece is provided at the end of the second winding plate 9, the first extension drive component includes a first telescopic drive 10 and a first docking piece, and the second extension drive component includes a second telescopic drive 11 and a second docking piece; the first docking piece can pass through the volute 1 into the first guide groove and be connected to the first connecting piece, and the second docking piece can pass through the volute 1 into the second guide groove and be connected to the second connecting piece, the first telescopic drive 10 can drive the first docking piece forward, drive the first winding plate 8 to unfold, and the second extension drive 11 can drive the second docking piece forward, drive the second winding plate 9 to unfold.

[0059] Since the first winding plate 8 and the second winding plate 9 need to be able to be stably wound around the first column and the second column, the first winding plate 8 and the second winding plate 9 in the present application can be made of flexible metal materials or plastic materials, such as aluminum materials. In order to ensure the smooth unfolding of the first winding plate 8 and the second winding plate 9, the present application further adds a first extension drive component and a second extension drive component, and correspondingly installs a first connecting member and a second connecting member at the free end of the first winding plate 8 and the free end of the second winding plate 9. The first extension drive component is connected to the first docking member, and the second extension drive component is connected to the second docking member. Therefore, when the first docking member is correspondingly connected to the first connecting member and the second docking member is correspondingly connected to the second connecting member, the first winding plate 8 and the second winding plate 9 can be smoothly unfolded by extending the first extension drive component and the second extension drive component.

[0060] It can be understood that in order to achieve smooth connection between the first docking member and the second docking member and the first connecting member and the second connecting member, the front plate 101 of the volute 1 in the present application is formed with guide perforations at the position corresponding to the first guide groove and the position corresponding to the second guide groove, that is, the first guide groove and the second guide groove in the present application both include a guide section and a connecting section, and the connecting section is hollow.

[0061] Taking the first wrapping plate 8 as an example, the free end of the first wrapping plate 8 first enters the guide section, and under the power of the rotation of the first column, it can move in the guide section. When it moves to the connecting section, the first connecting piece can be connected with the corresponding first docking piece. After the connection, the first extension drive assembly starts to extend, thereby driving the first docking piece to move along the extension direction of the connecting section, and then being able to drive the first wrapping plate 8 to unfold.

[0062] It should be noted here that, in the present embodiment, since the first extension drive assembly is a linear telescopic structure, the connecting section is a straight section, and since the first winding plate 8 is a winding structure, when the first winding plate 8 is unfolded, an arc-shaped diversion state can also be formed, thereby avoiding the jamming of the first extension drive assembly and achieving diversion.

[0063] When it is necessary to restore the first winding plate 8 to the state of the first guide column 2, the first extension drive assembly contracts. When it reaches the guide section, further contraction will separate the first docking member from the first connecting member, so that the first winding plate 8 can be restored by starting the first power member.

[0064] The movement process of the second winding plate 9 is the same as that of the first winding plate 8, which will not be repeated here. However, in this embodiment, the first connecting member can be a ball spring pin, and the first docking member is a pin hole. When the first connecting member reaches the connecting section from the guide section, the compressed ball can pop out and enter the pin hole to achieve locking with the first docking member. When the first extension drive assembly contracts, the extended ball can retract again under the action of the volute 1, thereby achieving separation between the first docking member and the first connecting member.

[0065] Preferably, both ends of the first winding plate 8 in the present application are provided with a first connecting member, and both ends of the second winding plate 9 are provided with a second connecting member; the first extension drive component is arranged in a one-to-one correspondence with the first connecting member, and the second extension drive component is arranged in a one-to-one correspondence with the second connecting member, thereby ensuring the stability of the connection and the stability of the driving expansion process.

[0066] Based on the above structure, the present application further provides two matching structures of the first connecting member and the second connecting member and the first docking member and the second docking member, in which the first connecting member and the second connecting member are both clamping holes, and the first docking member and the second docking member are both clamping hooks, and the first telescopic drive 10 and the second telescopic drive 11 can drive the clamping hooks to approach the clamping holes and clamp them into the clamping holes.

[0067] Another matching structure, the first connecting member and the second connecting member are both ferromagnets, the first docking member and the second docking member are both magnetic suction members, the first telescopic drive 10 and the second telescopic drive 11 can drive the magnetic suction member to approach the ferromagnetic member, so that the magnetic suction member and the ferromagnetic member are adsorbed.

[0068] It should be additionally explained here that the first telescopic drive 10 and the second telescopic drive 11 in the present application can adopt a linear telescopic structure such as a cylinder or an electric telescopic rod to achieve the movement of the first docking member and the second docking member.

[0069] In addition, the present invention also provides a range hood, comprising the above-mentioned centrifugal fan.

[0070] The range hood using the centrifugal fan provided in the present application can not only better adapt to miniaturized range hoods, but also avoid the noise and poor air flow guidance effect caused by the cutting part 102 to the fan to a certain extent, thereby improving the user experience to a certain extent.

[0071] like Figure 4 As shown, the present invention also provides a control method for the above-mentioned range hood, comprising the following steps: step one, determining whether the range hood is in an on or off state; step two, starting or restoring the first guide mechanism and the second guide mechanism according to the on / off state of the range hood; step three, when in the on state, adjusting the rotation speed and direction of the first guide column 2 and the second guide column 3 and the unfolding and winding of the first winding plate 8 and the second winding plate 9 according to the gear position of the range hood.

[0072] As an optional scheme of the control method, in step two, starting or restoring the first air guide mechanism and the second air guide mechanism according to the on / off state of the range hood includes: when the range hood is turned off, the first telescopic drive 10 and the second telescopic drive 11 control the first winding plate 8 and the second winding plate 9 to retract to form the first guide column 2 and the second guide column 3, and then stop the action.

[0073] As an alternative to the control method, in step three, adjusting the rotation speed and direction of the first guide column 2 and the second guide column 3 and the deployment and winding of the first winding plate 8 and the second winding plate 9 according to the suction range of the range hood includes: the range hood has a low range, a high range, and a stir-fry range; when in the low range, the first guide column 2 or both the first guide column 2 and the second guide column 3 rotate; when in the high range, the first guide column 2 rotates or the first guide column 2 rotates and the second winding plate 9 is deployed; when in the stir-fry range, the first guide column 2 rotates, the second winding plate 9 is deployed, or both the first winding plate 8 and the second winding plate 9 are deployed.

[0074] It should be added here that in the control method, the rotation and deployment of the above-mentioned first guide column 2, second guide column 3, first winding plate 8, and second winding plate 9 are all controlled according to the air volume, and the control process is as follows:

[0075] First, it is judged whether the range hood is in the shutdown state, that is, whether it has changed from the startup state to the shutdown state. If so, the first telescopic drive 10 and the second telescopic drive 11 reset and stop the first winding plate 8 and the second winding plate 9, and the first power member and the second power member stop, so that the first guide column 2 and the second guide column 3 stop.

[0076] If the range hood is in the startup state, the states of the first guide column 2, the second guide column 3, and the first winding plate 8 and the second winding plate 9 are controlled according to the suction range of the range hood and the air volume. And Figure 4 the air volumes Q6 > Q5 > Q4 > Q3 > Q2 > Q1 shown in

[0077] When the range hood is in the low range, it is judged whether Q is less than Q1. If it is less than Q1, it proves that the air volume is too small and the first guide column 2 needs to rotate for diversion. If not, it is continued to judge whether the air volume Q is in Q1 ≤ Q < Q2. If so, the first power member controls the first guide column 2 to rotate, and the second power member controls the second guide column 3 to rotate. If not, it is judged whether the range hood is in the shutdown state. If so, the first power member and the second power member are turned off. If not, the judgment process in the low range is repeated.

[0078] When the range hood is in the high range, it is judged whether Q is in Q2 ≤ Q < Q3. If so, the first guide column rotates, and the second telescopic drive 11 controls the second winding plate 9 to be deployed by one-half to make it in the state of a diversion plate. If not, it is continued to judge whether the air volume Q is in Q3 ≤ Q < Q4. If so, the first power member controls the first guide column 2 to rotate, and the second telescopic drive 11 controls the second winding plate 9 to be fully deployed. If not, it is judged whether it is shutdown. If it is shutdown, the structure is reset. If it is still in the startup state, the above judgment process is repeated.

[0079] When the range hood is in the stir-fry gear, it is judged whether Q is in the range of Q4 ≤ Q < Q5. If so, the first telescopic drive 10 controls the first winding plate 8 to unfold by one-half to make it in the state of a diversion plate, and the second telescopic drive 11 controls the second winding plate 9 to unfold completely to make it in the state of a diversion plate. If not, it is continued to judge whether the air volume Q is in the range of Q5 ≤ Q < Q6. If so, the first telescopic drive 10 controls the first winding plate 8 to unfold completely to make it in the state of a diversion plate, and the second telescopic drive 11 controls the second winding plate 9 to unfold completely to make it in the state of a diversion plate. If not, it is judged whether to shut down. If it is shut down, the structure is reset. If it is still in the on state, the above judgment process is repeated.

[0080] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A centrifugal fan, characterized in that: It comprises a volute (1), a first flow guiding mechanism and a second flow guiding mechanism; A cutting portion (102) is formed at a bottom position of the volute (1) relative to the air outlet, and the cutting portion (102) forms a first corner and a second corner in the volute (1); The first flow guiding mechanism is located in the volute (1) and is arranged relative to the first corner, and guides the gas passing through the first corner in the direction of the second corner; The second flow guiding mechanism is located in the volute (1) and is arranged relative to the second corner, and guides the gas passing through the second corner towards the air outlet.

2. The centrifugal fan according to claim 1, characterized in that: The first flow guiding mechanism comprises a first flow guiding column (2) and a first driving assembly, the second flow guiding mechanism comprises a second flow guiding column (3) and a second driving assembly, the output end of the first driving assembly is connected to one end of the first flow guiding column (2), and the other end of the first flow guiding column (2) is rotationally connected to the volute (1); The output end of the second driving component is connected to one end of the second guide column (3), and the other end of the second guide column (3) is rotationally connected to the volute (1); The first drive assembly and the second drive assembly are both arranged outside the volute (1).

3. The centrifugal fan according to claim 2, characterized in that: The first driving assembly comprises a first power member, a first transmission member (4) and a first engagement member (5); The first power member is connected to the first transmission member (4), the first transmission member (4) is meshed with the first engagement member (5), and the first engagement member (5) is fixedly connected to one end of the first guide column (2).

4. The centrifugal fan according to claim 2, characterized in that: The second driving assembly comprises a second power member, a second transmission member (6) and a second engagement member (7); The second power member is connected to the second transmission member (6), the second transmission member (6) is meshed with the second engagement member (7), and the second engagement member (7) is fixedly connected to one end of the second guide column (3).

5. The centrifugal fan according to claim 2, characterized in that: The first flow guide column (2) comprises a first column and a first winding plate (8), and the second flow guide column (3) comprises a second column and a second winding plate (9); The first winding plate (8) is wound on the first column, and the second winding plate (9) is wound on the second column, and the winding direction of the first winding plate (8) and the second winding plate (9) is opposite to the rotation direction of the first guide column (2) and the second guide column (3); A first guide groove is formed in the volute (1) at a position corresponding to the first guide column (2), and a second guide groove is formed at a position corresponding to the second guide column (3); When the first guide column (2) and the second guide column (3) rotate in the winding direction of the first winding plate (8) and the second winding plate (9), the edge of the first winding plate (8) can enter the first guide groove and move along the first guide groove, so that the first winding plate (8) is unfolded, and the edge of the second winding plate (9) can enter the second guide groove and move along the second guide groove, so that the second winding plate (9) is unfolded.

6. The centrifugal fan according to claim 5, characterized in that: Also included is a first extension drive assembly and a second extension drive assembly; The first extension drive assembly and the second extension drive assembly are both located on the outer wall of the volute (1), and the first extension drive assembly is arranged corresponding to the first guide groove, and the second extension drive assembly is arranged corresponding to the second guide groove; The end of the first winding plate (8) is provided with a first connecting piece, the end of the second winding plate (9) is provided with a second connecting piece, the first extension drive assembly includes a first telescopic drive (10) and a first docking piece, and the second extension drive assembly includes a second telescopic drive (11) and a second docking piece; The first docking member can pass through the volute (1) into the first guide groove and be connected to the first connecting member, the second docking member can pass through the volute (1) into the second guide groove and be connected to the second connecting member, the first telescopic drive (10) can drive the first docking member forward to drive the first winding plate (8) to unfold, and the second telescopic drive (11) can drive the second docking member forward to drive the second winding plate (9) to unfold.

7. The centrifugal fan according to claim 6, characterized in that: Both ends of the first winding plate (8) are provided with first connecting pieces, and both ends of the second winding plate (9) are provided with second connecting pieces; The first extension drive assembly is disposed in a one-to-one correspondence with the first connecting member, and the second extension drive assembly is disposed in a one-to-one correspondence with the second connecting member.

8. The centrifugal fan according to claim 6, characterized in that: The first connecting member and the second connecting member are both latching holes, the first docking member and the second docking member are both latching hooks, and the first telescopic drive (10) and the second telescopic drive (11) can drive the latching hooks to approach the latching holes and latch into the latching holes.

9. The centrifugal fan according to claim 6, characterized in that: The first connecting member and the second connecting member are both ferromagnets, the first docking member and the second docking member are both magnetic attraction members, and the first telescopic drive (10) and the second telescopic drive (11) can drive the magnetic attraction member to approach the ferromagnetic member so that the magnetic attraction member and the ferromagnetic member are attracted to each other.

10. A range hood, characterized in that: A centrifugal fan comprising any one of claims 6 to 9.

11. A control method for a range hood according to claim 10, characterized in that: The steps include: Step 1: Determine whether the range hood is turned on or off; Step 2: starting or restoring the first air guiding mechanism and the second air guiding mechanism according to the on / off state of the range hood; Step three: when the range hood is turned on, the rotation speed and direction of the first guide column (2) and the second guide column (3) and the unfolding and winding of the first winding plate (8) and the second winding plate (9) are adjusted according to the gear position of the range hood.

12. The range hood control method according to claim 11, characterized in that: In step 2, starting or restoring the first air guiding mechanism and the second air guiding mechanism according to the on / off state of the range hood includes: When the machine is turned off, the first telescopic drive (10) and the second telescopic drive (11) control the first winding plate (8) and the second winding plate (9) to retract to form the first guide column (2) and the second guide column (3), and then stop the action.

13. The range hood control method according to claim 11, characterized in that: In step three, adjusting the rotation speed and direction of the first guide column (2) and the second guide column (3) and the unfolding and winding of the first winding plate (8) and the second winding plate (9) according to the gear position of the range hood includes: The range hood has a weak gear, a strong gear and a stir-fry gear; When in a weak gear, the first guide column (2) or the first guide column (2) and the second guide column (3) both rotate; When in a strong gear, the first guide column (2) rotates or the first guide column (2) rotates, and the second winding plate (9) unfolds; When in the stir-frying gear, the first guide column (2) rotates, the second winding plate (9) unfolds, or both the first winding plate (8) and the second winding plate (9) unfold.

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