Centrifugal fan, range hood, and control methods for range hood

Abstract

This invention provides a centrifugal fan and a range hood, relating to the field of range hood technology, to optimize the volute structure of the range hood to a certain extent, reduce wind noise during operation, and improve the user experience. The centrifugal fan provided by this invention includes a volute, a first flow guiding mechanism, and a second flow guiding mechanism. A cutting portion is formed at the bottom of the volute relative to the air outlet, creating a first corner and a second corner within the volute. The first flow guiding mechanism is located inside the volute and positioned relative to the first corner, guiding the gas passing through the first corner towards the second corner. The second flow guiding mechanism is located inside the volute and positioned relative to the second corner, guiding the gas passing through the second corner towards the air outlet.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, and in particular to a centrifugal fan, a range hood, and a control method for the range hood. Background Technology

[0002] In household appliances, due to size and space constraints, especially in the design of range hoods, the trend towards smaller dimensions has led to the need for cutting the casing of multi-blade centrifugal fans to meet the requirements of the limited internal space of range hoods. Currently, the casing cutting on the market is all done with straight lines, and the flow cross-sectional area of ​​the casing undergoes a sudden process of first decreasing and then increasing. This causes severe flow separation of the gas flowing out of the impeller at this cutting point. If too much is cut, it will increase the noise of the fan and reduce its aerodynamic performance.

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

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

[0005] The present invention provides a centrifugal fan, including a volute, a first flow guiding mechanism, and a second flow guiding mechanism; a cutting portion is formed at the bottom position of the volute relative to the air outlet, the cutting portion forming a first corner and a second corner inside the volute; the first flow guiding mechanism is located inside the volute and is arranged relative to the first corner, guiding the gas passing through the first corner towards the direction of the second corner; the second flow guiding mechanism is located inside the volute and is arranged relative to the second corner, guiding the gas passing through the second corner towards the direction of the air outlet.

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

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

[0009] As an optional solution for the 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 around the first column, and the second winding plate is wound around the second column, with the winding directions of the first and second winding plates opposite to the rotation directions of the first and second guide columns. A first guide groove is formed in the volute corresponding to the position of the first guide column, and a second guide groove is formed corresponding to the position of the second guide column. When the first and second guide columns rotate in the winding directions of the first and second winding plates, the edge of the first winding plate can enter the first guide groove and move along the first guide groove, causing the first winding plate to unfold. The edge of the second winding plate can enter the second guide groove and move along the second guide groove, causing the second winding plate to unfold.

[0010] As an optional solution for the centrifugal fan, the centrifugal fan provided by the present invention further includes a first extension drive assembly and a second extension drive assembly; both the first extension drive assembly and the second extension drive assembly are located on the outer wall of the volute, and the first extension drive assembly is configured corresponding to the first guide groove, and the second extension drive assembly is configured corresponding to the second guide groove; the end of the first winding plate is provided with a first connector, and the end of the second winding plate is provided with a second connector; the first extension drive assembly includes a first telescopic drive and a first docking member, and the second extension drive assembly includes a second telescopic drive and a second docking member; the first docking member can pass through the volute and enter the first guide groove to connect with the first connector, and the second docking member can pass through the volute and enter the second guide groove to connect with the second connector; the first telescopic drive can drive the first docking member forward, causing the first winding plate to unfold, and the second telescopic drive can drive the second docking member forward, causing the second winding plate to unfold.

[0011] As an optional solution for centrifugal fans, both ends of the first winding plate are provided with first connectors, and both ends of the second winding plate are provided with second connectors; the first extension drive assembly is configured in a one-to-one correspondence with the first connector, and the second extension drive assembly is configured in a one-to-one correspondence with the second connector.

[0012] As an optional solution for centrifugal fans, both the first and second connecting parts have locking holes, and both the first and second docking parts have locking hooks. The first and second telescopic drives can drive the locking hooks to approach the locking holes and engage with them.

[0013] As an optional solution for centrifugal fans, both the first and second connecting parts are ferromagnets, and both the first and second docking parts are magnetic attracting parts. The first and second telescopic drives can drive the magnetic attracting parts to approach the ferromagnetic parts, so that the magnetic attracting parts and the ferromagnetic parts are attracted to each other.

[0014] Compared with existing technologies, the centrifugal fan provided by this invention has the following advantages:

[0015] The centrifugal fan provided by the present invention includes a volute, a first flow guiding mechanism, and a second flow guiding 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 inside the volute. The first flow guiding mechanism is located inside the volute and is arranged relative to the first corner, guiding the gas passing through the first corner towards the direction of the second corner. The second flow guiding mechanism is located inside the volute and is arranged relative to the second corner, guiding the gas passing through the second corner towards the direction of the air outlet.

[0016] Analysis shows that by forming a cut section at the bottom of the volute relative to the air outlet, the overall size of the centrifugal fan can be reduced, making the centrifugal fan provided in this application more compatible with miniaturized or small-sized range hoods. However, since the cut section will form a first corner and a second corner inside the volute, this application can further guide the airflow reaching the first corner and the second corner by adding a first guide mechanism at the first corner and a second guide mechanism at the second corner. This can, to a certain extent, avoid the problem of airflow directly hitting the wall of the cut section and generating wind noise, as well as the problem of turbulence caused by collision with other airflows and affecting the fan efficiency.

[0017] In addition, the present invention also provides a range hood, including the centrifugal fan described above.

[0018] The range hood using the centrifugal fan provided in this application can be better adapted to smaller range hoods and can also avoid the noise and poor airflow 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 1, determining whether the range hood is in the on or off state; Step 2, starting or resetting the first and second flow guiding mechanisms according to the on / off state of the range hood; Step 3, when in the on state, adjusting the rotation speed and direction of the first and second flow guiding columns, as well as the unfolding and winding of the first and second winding plates, according to the range hood's speed setting.

[0020] As an optional control method, in step two, starting or resetting the first and second flow guiding mechanisms according to the on / off state of the range hood includes: when the range hood is off, the first and second telescopic drives control the first and second winding plates to retract and form the first and second flow guiding columns, and then stop the operation.

[0021] As an optional control method, in step three, adjusting the rotation speed and direction of the first and second guide columns, as well as the unfolding and winding of the first and second winding plates, according to the range hood's setting includes: the range hood has a low setting, a high setting, and a stir-fry setting; when in the low setting, the first guide column or both the first and second guide columns rotate; when in the high setting, the first guide column rotates or the first guide column rotates while the second winding plate unfolds; when in the stir-fry setting, the first guide column rotates while the second winding plate unfolds or both the first and second winding plates unfold. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a structural schematic diagram of the first and second guide columns in a centrifugal fan provided in an embodiment of the present invention;

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

[0025] Figure 3 This is a schematic diagram of the unfolded structure of the first and second winding plates in the centrifugal fan provided in an embodiment of the present invention;

[0026] Figure 4 This is a logic diagram of the 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 component; 5-first meshing component; 6-second transmission component; 7-second meshing component; 8-first winding plate; 9-second winding plate; 10-first telescopic drive; 11-second telescopic drive. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0029] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply 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 this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

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

[0033] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” may be used herein to describe the relationship between one element and another as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also the different orientations of the device during use or operation.

[0034] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0035] Variations in the shapes shown in the accompanying 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 accompanying drawings, but include changes in shape that may occur during manufacturing.

[0036] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have various constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis that they can be implemented by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

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

[0038] Compared with existing technologies, the centrifugal fan provided by this invention has the following advantages:

[0039] The centrifugal fan provided by this invention reduces the overall size of the centrifugal fan by forming a cutting section 102 at the bottom of the volute 1 relative to the air outlet. This makes the centrifugal fan more compatible with miniaturized or small-sized range hoods. However, since the cutting section 102 creates a first corner and a second corner inside the volute 1, this invention further adds a first guide mechanism at the first corner and a second guide mechanism at the second corner to guide the airflow reaching the first and second corners. This can, to a certain extent, avoid the problem of airflow directly impacting the wall of the cutting section 102 and generating wind noise, as well as the problem of turbulence caused by impacting other airflows and affecting the fan efficiency.

[0040] It should be noted that the first and second flow guiding mechanisms in this application can directly adopt an arc-shaped flow guide plate structure to guide the airflow at the first and second corners.

[0041] To ensure the flow guiding effect, the number of the first and second flow guiding mechanisms can be increased or decreased as needed to guarantee the flow guiding capacity.

[0042] Optionally, such as Figure 1 Combination Figure 2 As shown, the first flow guiding mechanism in this application includes a first flow guiding column 2 and a first driving assembly, and the second flow guiding mechanism includes 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 rotatably connected to the volute 1. The output end of the second driving assembly is connected to one end of the second flow guiding column 3, and the other end of the second flow guiding column 3 is rotatably connected to the volute 1. Both the first driving assembly and the second driving assembly are disposed outside the volute 1.

[0043] In this embodiment, both the first driving component and the second driving component can be motors, and the output shaft of the motor is directly connected to the first guide column 2 and the second guide column 3, thereby driving the first guide column 2 and the second guide column 3 to rotate.

[0044] It is understandable that after the volute 1 forms the cutting part 102, the internal space of the volute 1 is limited. Furthermore, when the range hood is in low power mode, the gas flow rate is small and the flow velocity is low. 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 thus affecting the fan efficiency.

[0045] Therefore, this 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 and the second guide column 3 to rotate through a first drive component. By utilizing the Magrus principle, the airflow passing through the first guide column 2 and the second guide column 3 can be accelerated, thereby enabling the airflow passing through the first guide column 2 to smoothly reach the second guide column 3 and be discharged through the second guide column 3 to the outlet. This ensures the smooth passage of low-flow-rate airflow in low-power mode and guarantees the efficiency of the fan.

[0046] Since both the first guide column 2 and the second guide column 3 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, such as Figure 1 Combination Figure 2 As shown, the first drive assembly in this application includes a first power component, a first transmission component 4, and a first meshing component 5; the first power component is connected to the first transmission component 4, the first transmission component 4 meshes with the first meshing component 5, and the first meshing component 5 is fixedly connected to one end of the first guide column 2.

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

[0049] In this application, both the first meshing member 5 and the second meshing member 7 are gears. The first and second power members can be small motors, and both can be mounted on the front plate 101 of the volute 1 and fit snugly against it to reduce the overall size of the centrifugal fan in the thickness direction. However, in this configuration, the output shafts of the first and second power members are perpendicular to the first guide column 2 and the second guide column 3. Therefore, both the first transmission member 4 and the second transmission member 6 in this application can include spur gears and bevel gears. The spur gears enable corresponding meshing with the first meshing member 5 and the second meshing member 7, while the bevel gears enable the reversal of power. This allows the power of the first power member to be transmitted from the first transmission member 4 to the first meshing member 5, and the power of the second power member to be transmitted from the second transmission member 6 to the second meshing member 7.

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

[0051] It should be noted that, in this application, both ends of the first guide column 2 and the second guide column 3 can be provided with a first driving component and a second driving component, which can ensure that the force on the first guide column 2 and the second guide column 3 is even to a certain extent, thus ensuring the guiding effect.

[0052] As an alternative to centrifugal fans, such as Figure 3 As shown, the first guide column 2 in this 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 around the first column, and the second winding plate 9 is wound around 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 corresponding to the position of the first guide column 2, and a second guide groove is formed corresponding to the position of 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 unfolds, 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 unfolds.

[0053] In this embodiment, the first guide column 2 of this 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 engaging member 5 is connected to the end of the first column, and the second column is connected to the second engaging member 7, so as to realize rotation in the state of the first guide column 2 and the second guide column 3.

[0054] It is understandable 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 this application are free ends. Furthermore, 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, thus affecting the guiding effect, 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.

[0055] Furthermore, in this application, a first guide groove is formed inside the volute 1 at the position corresponding to the first guide post 2, and a second guide groove is formed at the position corresponding to the second guide post 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 preventing the first winding plate 8 and the second winding plate 9 from unfolding in a low-power state.

[0056] When the range hood needs to operate at high power, the first and second power components can be reversed, thereby driving the first and second columns to rotate in opposite directions. Correspondingly, 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. Thus, under the action of the first and second guide grooves, the first winding plate 8 and the second winding plate 9 will unfold.

[0057] It should be noted that in this application, both the first guide groove and the second guide groove are arc-shaped grooves, so that the first winding plate 8 and the second winding plate 9 have a certain curvature after being unfolded, which can guide the airflow and ensure the airflow guiding capability under high power conditions.

[0058] Optionally, such as Figure 3 As shown, the centrifugal fan provided by the present invention further includes a first extension drive assembly and a second extension drive assembly; both the first extension drive assembly and the second extension drive assembly are 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 connector, and the end of the second winding plate 9 is provided with a second connector; the first extension drive assembly includes a first telescopic drive 10 and a first docking member, and the second extension drive assembly includes a second telescopic drive 11 and a second docking member; the first docking member can pass through the volute 1 and enter the first guide groove to connect with the first connector, and the second docking member can pass through the volute 1 and enter the second guide groove to connect with the second connector; the first telescopic drive 10 can drive the first docking member forward, causing the first winding plate 8 to unfold, and the second extension drive 11 can drive the second docking member forward, causing the second winding plate 9 to unfold.

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

[0060] It is understandable that, in order to achieve a smooth connection between the first docking part and the second docking part and the first connecting part and the second connecting part, the front plate 101 of the volute 1 in this application has guide holes at the positions corresponding to the first guide groove and the second guide groove. That is, the first guide groove and the second guide groove in this application both include a guide section and a connecting section, and the connecting section is hollow.

[0061] Taking the first winding plate 8 as an example, the free end of the first winding plate 8 first enters the guide section. 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 connect with the corresponding first docking piece. After the connection, the first extension drive component starts to extend, thereby driving the first docking piece to move along the extension direction of the connecting section, and thus driving the first winding plate 8 to unfold.

[0062] It should be noted that in this embodiment, since the first extension drive component is a linear telescopic structure, the connecting section is a straight section. Since the first winding plate 8 is a winding structure, when the first winding plate 8 is unfolded, it can also form an arc-shaped flow guiding state, thereby avoiding the jamming of the first extension drive component and achieving flow guiding.

[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 piece from the first connecting piece, so that the first winding plate 8 can be restored by activating the first power component.

[0064] The movement process of the second winding plate 9 is the same as that of the first winding plate 8, and 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 lock with the first docking member. When the first extension drive assembly retracts, the extended ball can retract again under the action of the volute 1, thereby realizing the separation between the first docking member and the first connecting member.

[0065] Preferably, the first winding plate 8 in this application is provided with a first connector at both ends, and the second winding plate 9 is provided with a second connector at both ends; the first extension drive component is provided with the first connector in a one-to-one correspondence, and the second extension drive component is provided with the second connector in a one-to-one correspondence, thereby ensuring the stability of the connection and the stability of the drive deployment process.

[0066] Based on the above structure, this application further provides two mating structures for the first connector and the second connector, as well as the first docking member and the second docking member. In one of these structures, both the first connector and the second connector are locking holes, and both the first docking member and the second docking member are hooks. The first telescopic drive 10 and the second telescopic drive 11 can drive the hooks to approach the locking holes and engage with them.

[0067] In another mating structure, both the first and second connecting parts are ferromagnets, and both the first and second mating parts are magnetic attracting parts. The first telescopic drive 10 and the second telescopic drive 11 can drive the magnetic attracting parts to approach the ferromagnetic parts, so that the magnetic attracting parts and the ferromagnetic parts are attracted to each other.

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

[0069] In addition, the present invention also provides a range hood, including the centrifugal fan described above.

[0070] The range hood using the centrifugal fan provided in this application can better adapt to miniaturized range hoods and can also avoid the noise and poor airflow 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 1, determining whether the range hood is in the on or off state; Step 2, starting or resetting the first and second flow guiding mechanisms according to the on / off state of the range hood; Step 3, when in the on state, adjusting the rotation speed and direction of the first and second flow guiding columns 2 and 3, as well as the unfolding and winding of the first and second winding plates 8 and 9, according to the range hood's speed setting.

[0072] As an optional control method, in step two, starting or resetting the first and second flow guiding mechanisms according to the on / off state of the range hood includes: when the range hood is 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 and form the first flow guiding column 2 and the second flow guiding column 3, and then stop the operation.

[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 supplemented 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, determine whether the range hood is in the shutdown state, that is, whether it changes 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 component and the second power component stop, causing the first guide column 2 and the second guide column 3 to stop.

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

[0077] When the range hood is in the low range, determine 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, continue to determine whether the air volume Q is in the range of Q1 ≤ Q < Q2. If so, the first power component controls the first guide column 2 to rotate, and the second power component controls the second guide column 3 to rotate. If not, determine whether the range hood is in the shutdown state. If so, turn off the first power component and the second power component. If not, repeat the judgment process in the low range.

[0078] When the range hood is in the high range, determine whether Q is in the range of 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 deflector plate. If not, continue to determine whether the air volume Q is in the range of Q3 ≤ Q < Q4. If so, the first power component 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, determine whether it is shutdown. If it is shutdown, the structure is reset. If it is still in the startup state, repeat the above judgment process.

[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 deflector plate, and the second telescopic drive 11 controls the second winding plate 9 to unfold completely to make it in the state of a deflector plate. If not, it continues 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 deflector plate, and the second telescopic drive 11 controls the second winding plate 9 to unfold completely to make it in the state of a deflector plate. If not, it judges 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 within the protection scope of the present invention.

Claims

1. A centrifugal fan, characterized in that, Includes a volute (1), a first flow guiding mechanism, and a second flow guiding mechanism; The volute (1) has a cutting part (102) at the bottom position relative to the air outlet, and the cutting part (102) forms a first corner and a second corner inside the volute (1); The first flow guiding mechanism is located inside the volute (1) and is positioned relative to the first corner, guiding the gas passing through the first corner toward the second corner; The second flow guiding mechanism is located inside the volute (1) and is positioned relative to the second corner, guiding the gas passing through the second corner toward the air outlet.

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

3. The centrifugal fan according to claim 2, characterized in that, The first drive assembly includes a first power component, a first transmission component (4), and a first meshing component (5); The first power component is connected to the first transmission component (4), the first transmission component (4) is engaged with the first meshing component (5), and the first meshing component (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 drive assembly includes a second power component, a second transmission component (6), and a second engagement component (7); The second power component is connected to the second transmission component (6), the second transmission component (6) is engaged with the second meshing component (7), and the second meshing component (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 guide column (2) 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 around the first column, and the second winding plate (9) is wound around the second column. The winding directions of the first winding plate (8) and the second winding plate (9) are opposite to the rotation directions of the first guide column (2) and the second guide column (3). A first guide groove is formed inside the volute (1) at the position corresponding to the first guide column (2), and a second guide groove is formed at the 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) unfolds, 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) unfolds.

6. The centrifugal fan according to claim 5, characterized in that, It also includes a first extension drive component and a second extension drive component; 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 set in relation to the first guide groove, and the second extension drive assembly is set in relation to the second guide groove; The first winding plate (8) is provided with a first connector at its end, and the second winding plate (9) is provided with a second connector at its end. The first extension drive assembly includes a first telescopic drive (10) and a first docking member, and the second extension drive assembly includes a second telescopic drive (11) and a second docking member. The first docking member can pass through the volute (1) and enter the first guide groove to connect with the first connecting member. The second docking member can pass through the volute (1) and enter the second guide groove to connect with the second connecting member. The first telescopic drive (10) can drive the first docking member forward and drive the first winding plate (8) to unfold. The second telescopic drive (11) can drive the second docking member forward and drive the second winding plate (9) to unfold.

7. The centrifugal fan according to claim 6, characterized in that, The first winding plate (8) is provided with a first connector at both ends, and the second winding plate (9) is provided with a second connector at both ends; The first extension drive component is configured to correspond one-to-one with the first connector, and the second extension drive component is configured to correspond one-to-one with the second connector.

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

9. The centrifugal fan according to claim 6, characterized in that, Both the first connector and the second connector are ferromagnetic components, and both the first docking component and the second docking component are magnetic components. The first telescopic drive (10) and the second telescopic drive (11) can drive the magnetic component to approach the ferromagnetic component, so that the magnetic component and the ferromagnetic component are attracted to each other.

10. A range hood, characterized in that, The centrifugal fan included in any one of claims 6-9 above.

11. A control method for a range hood according to claim 10, characterized in that, Includes the following steps: Step 1: Determine whether the range hood is on or off; Step 2: Activate or reset the first and second flow guiding mechanisms according to the on / off status of the range hood; Step 3: When the range hood is in the power-on state, adjust the speed and direction of the first guide column (2) and the second guide column (3), as well as the unfolding and winding of the first winding plate (8) and the second winding plate (9) according to the range hood's gear setting.

12. The range hood control method according to claim 11, characterized in that, In step two, activating or resetting the first and second flow guiding mechanisms according to the on / off status of the range hood includes: When the machine is 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 and form the first guide column (2) and the second guide column (3), and then stop the operation.

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) according to the range hood's setting, as well as the unfolding and winding of the first winding plate (8) and the second winding plate (9), includes: The range hood has a low setting, a high setting, and a stir-fry setting; When in the low gear, the first guide column (2) or both the first guide column (2) and the second guide column (3) rotate; When in high gear, the first guide column (2) rotates or the second winding plate (9) unfolds at the same time. When in the stir-fry mode, the first guide column (2) rotates, and the second winding plate (9) unfolds, or both the first winding plate (8) and the second winding plate (9) unfold.

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