volute fan and backflow prevention adjustment method

Abstract

This invention provides a volute fan and an anti-backflow adjustment method, relating to the field of range hood technology, to optimize the structure of the volute fan to a certain extent and reduce backflow airflow at the volute tongue of the volute fan. The volute fan provided by this invention includes a volute, a first adjustment mechanism, a second adjustment mechanism, and a noise detection mechanism. The volute has a volute tongue. The noise detection mechanism is disposed at the air outlet of the volute. The first adjustment mechanism is disposed on the mounting wall on the side of the volute tongue facing the air outlet. Both ends of the first adjustment mechanism are respectively clearance-fitted with the two side walls of the volute in a first direction, and the first adjustment mechanism can rotate relative to the mounting wall, so that the first adjustment mechanism is in contact with the mounting wall or at an angle. The second adjustment mechanism has the same shape as the volute tongue and can move towards or away from the volute tongue.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, and in particular to a volute fan and a backflow prevention adjustment method. Background Technology

[0002] Currently, range hoods have become an essential kitchen appliance for ordinary families. When a range hood is working, it uses a fan to draw in and exhaust cooking fumes. Generally, household range hoods use multi-blade centrifugal fans for both intake and exhaust.

[0003] Centrifugal fans generally consist of a volute, a motor, and an impeller. The tongue-shaped protrusion inside the volute is called the volute tongue, and its main function is to separate the flowing gas and prevent the gas from circulating within the volute. Due to the high gas pressure and large pressure gradient changes near the volute tongue, the flow is complex, and backflow can easily occur at the outlet of the volute tongue. This backflow at the outlet of the volute tongue causes impeller rotational imbalance and turbulent flow within the volute, thus generating flow noise and rotational noise.

[0004] Therefore, there is an urgent need to provide a volute fan and a backflow prevention adjustment method to solve the problems existing in the prior art to a certain extent. Summary of the Invention

[0005] The purpose of this invention is to provide a volute fan and a backflow prevention adjustment method to optimize the structure of the volute fan to a certain extent and reduce the backflow airflow at the volute tongue of the volute fan.

[0006] This invention provides a volute fan, comprising a volute, a first adjustment mechanism, a second adjustment mechanism, and a noise detection mechanism. The volute has a volute tongue, the noise detection mechanism is disposed at the air outlet of the volute, the first adjustment mechanism is disposed on the mounting wall on the side of the volute tongue facing the air outlet, and the first adjustment mechanism extends along a first direction. The two ends of the first adjustment mechanism are respectively clearance-fitted with the two side walls of the volute in the first direction, and the first adjustment mechanism can rotate relative to the mounting wall, so that the first adjustment mechanism is in contact with the mounting wall or at an angle; the second adjustment mechanism has the same shape as the volute tongue, and the second adjustment mechanism can move towards or away from the volute tongue.

[0007] As an optional solution for the volute fan, the second adjustment mechanism includes a second drive assembly and a second adjustment member. The second drive assembly is disposed outside the volute, and the telescopic end of the second drive assembly passes through the volute and is connected to the second adjustment member, so that the second adjustment member moves toward or away from the volute tongue.

[0008] As an optional solution for the volute fan, the second adjusting component includes a first volute tongue block and a second volute tongue block; the number of the second driving components corresponds to the number of the first volute tongue blocks and the second volute tongue blocks, and the first volute tongue blocks and the second volute tongue blocks are spaced apart along a first direction, with the sum of the overall dimensions of the first volute tongue blocks and the second volute tongue blocks being 'a', and the dimension of the volute in the first direction being 'b'.

[0009] As an optional solution for the volute fan, the first adjustment mechanism includes a first drive assembly and a first adjustment member. The first drive assembly is disposed outside the volute, and the output end of the first drive assembly passes through the volute and is connected to the first adjustment member. The first adjustment member can rotate relative to the mounting wall and is either in contact with the mounting wall or at an angle.

[0010] As an optional solution for the volute fan, the first drive assembly includes a drive motor and a rotating shaft. The rotating shaft extends along a first direction and is fixedly connected to a first adjusting member. One end of the rotating shaft is connected to the output end of the drive motor.

[0011] As an optional solution for the volute fan, the first drive assembly also includes a first transmission component and a second transmission component. The first transmission component is connected to the output end of the drive motor, and the second transmission component is connected to one end of the rotating shaft. The first transmission component and the second transmission component are connected in a transmission connection.

[0012] As an optional solution for the volute fan, the first adjusting component includes a first baffle, a second baffle, and a third baffle, and the number of the first driving components corresponds to the number of the first baffle, the second baffle, and the third baffle; the first baffle, the second baffle, and the third baffle are arranged sequentially from the volute tongue towards the air outlet, and the intervals between the first baffle, the second baffle, and the third baffle are the same.

[0013] As an optional solution for the volute fan, a first groove is formed on the side wall of the volute corresponding to the position of the first baffle, a second groove is formed corresponding to the position of the second baffle, and a third groove is formed corresponding to the position of the third baffle; a first support rod is provided on the first baffle corresponding to the position of the first groove, and one end of the first support rod is located in the first groove; a second support rod is provided on the second baffle corresponding to the position of the second groove, and one end of the second support rod is located in the second groove; a third support rod is provided on the third baffle corresponding to the position of the third groove, and one end of the third support rod is located in the third groove.

[0014] As an optional solution for the volute fan, the first slide groove, the second slide groove, and the third slide groove are all arc-shaped, and the movable stroke of the third support rod in the third slide groove is greater than the movable stroke of the second support rod in the second slide groove. The movable stroke of the second support rod in the second slide groove is greater than the movable stroke of the first support rod in the first slide groove, so that the rotation angle range of the third baffle is greater than the rotation angle range of the second baffle, and the rotation angle range of the second baffle is greater than the rotation angle range of the first baffle.

[0015] Compared with existing technologies, the volute fan provided by this invention has the following advantages:

[0016] The volute fan provided by the present invention includes a volute, a first adjustment mechanism, a second adjustment mechanism, and a noise detection mechanism. The volute has a volute tongue, the noise detection mechanism is disposed at the air outlet of the volute, the first adjustment mechanism is disposed on the mounting wall on the side of the volute tongue facing the air outlet, and the first adjustment mechanism extends along a first direction. The two ends of the first adjustment mechanism are respectively clearance-fitted with the two side walls of the volute in the first direction, and the first adjustment mechanism can rotate relative to the mounting wall, so that the first adjustment mechanism is in contact with the mounting wall or at an angle. The second adjustment mechanism has the same shape as the volute tongue, and the second adjustment mechanism can move towards or away from the volute tongue.

[0017] Analysis shows that by setting a first adjustment mechanism on the mounting wall facing the air outlet, and enabling the first adjustment mechanism in this application to rotate relative to the mounting wall, and by setting a second adjustment mechanism corresponding to the position of the volute tongue, and enabling the second adjustment mechanism to move towards or away from the volute tongue, the first adjustment mechanism can reduce or eliminate the backflow formed at the position of the volute tongue mounting wall, while the second adjustment mechanism can prevent the backflow airflow from re-entering the impeller of the volute fan when backflow is formed.

[0018] Since the volute fan in this application is equipped with a noise detection mechanism at the air outlet, the noise at the air outlet can be monitored in real time. It is understood that the volute fan provided in this application is used in a range hood. Therefore, in practical application, when the range hood is turned on, the noise detection mechanism can detect the noise at the air outlet. Correspondingly, the noise detection mechanism has a preset threshold. When the noise exceeds the threshold, the first adjustment mechanism can be adjusted to rotate relative to the mounting wall, and the second adjustment mechanism can be adjusted to extend relative to the volute tongue, thereby reducing or eliminating the backflow air at the volute tongue, and thus reducing or eliminating the noise at the air outlet. Conversely, when the noise detected by the noise detection mechanism is below the threshold, the first and second adjustment mechanisms remain in their corresponding positions. When the noise is detected to exceed the threshold again, the first and second adjustment mechanisms are further controlled to move, thereby continuing to eliminate the noise.

[0019] When the cigarette is turned off, both the first and second adjustment mechanisms move to their initial positions.

[0020] In addition, the present invention also provides a backflow prevention adjustment method for a volute fan, comprising the following steps: Step 1: After starting the machine, control the first adjustment mechanism to fit against the mounting wall and the second adjustment mechanism to contact the volute tongue; Step 2: Use a noise detection mechanism to monitor the noise at the position of the first adjustment mechanism, and control the angle of the first adjustment mechanism relative to the mounting wall and the distance of the second adjustment mechanism relative to the volute tongue according to the noise feedback.

[0021] As an optional solution for the anti-backflow adjustment method, in step two, controlling the angle of the first adjustment mechanism relative to the mounting wall and the distance of the second adjustment mechanism relative to the volute tongue based on noise feedback includes: adjusting the angle of the first adjustment mechanism relative to the mounting wall and the distance of the second adjustment mechanism relative to the volute tongue according to the range hood's speed setting and the noise value detected by the noise detection mechanism; when the range hood is in the low setting, adjusting one baffle in the first adjustment mechanism according to the noise value detected by the noise detection mechanism to reduce the noise value to within a set threshold; when the range hood is in the high setting, adjusting two baffles in the first adjustment mechanism according to the noise value detected by the noise detection mechanism, while simultaneously adjusting the distance between the second adjustment mechanism and the volute tongue to reduce the noise value to within a set threshold; when the range hood is in the high-heat setting, adjusting all baffles in the first adjustment mechanism according to the noise value detected by the noise detection mechanism, while simultaneously adjusting the distance between the second adjustment mechanism and the volute tongue to reduce the noise value to within a set threshold.

[0022] The adjustment method using the volute fan provided in this application can change the angle between the first adjustment mechanism and the mounting wall and the distance between the second adjustment mechanism and the volute tongue in real time according to the corresponding power and demand of the flue gas fan, thereby better reducing or eliminating flue gas backflow, and thus avoiding the problems of impeller rotation imbalance and flow noise and rotation noise caused by backflow. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a schematic diagram of the internal structure of a volute fan provided in an embodiment of the present invention;

[0025] Figure 2 This is a first-view structural schematic diagram of a volute fan provided in an embodiment of the present invention;

[0026] Figure 3 This is a structural schematic diagram of a volute fan provided in an embodiment of the present invention from a second perspective;

[0027] Figure 4 The logic diagram of the anti-backflow adjustment method provided in the embodiment of the present invention.

[0028] In the diagram: 1-Volume; 101-Volume tongue; 1011-Mounting wall; 102-Air outlet; 2-First baffle; 3-Second baffle; 4-Third baffle; 5-First drive assembly; 6-Second drive assembly; 601-First drive component; 602-Second drive component; 7-First volume tongue block; 8-Second volume tongue block;

[0029] S1 - First direction. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] like Figures 1-3As shown, the present invention provides a volute fan, including a volute 1, a first adjustment mechanism, a second adjustment mechanism, and a noise detection mechanism; the volute 1 has a volute tongue 101, the noise detection mechanism is disposed at the air outlet 102 of the volute 1, the first adjustment mechanism is disposed on the mounting wall 1011 on the side of the volute tongue 101 facing the air outlet 102, and the first adjustment mechanism extends along a first direction S1, the two ends of the first adjustment mechanism are respectively in clearance fit with the two side walls of the volute 1 in the first direction S1, and the first adjustment mechanism can rotate relative to the mounting wall 1011, so that the first adjustment mechanism is in close contact with the mounting wall 1011 or is set at an angle; the second adjustment mechanism has the same shape as the volute tongue 101, and the second adjustment mechanism can move towards or away from the volute tongue 101.

[0040] Compared with existing technologies, the volute fan provided by this invention has the following advantages:

[0041] The volute fan provided by the present invention has a first adjustment mechanism provided on the mounting wall 1011 at the position of the volute tongue 101 facing the air outlet 102, and the first adjustment mechanism in this application can rotate relative to the mounting wall 1011. A second adjustment mechanism is provided at the position of the volute tongue 101, and the second adjustment mechanism can move towards or away from the volute tongue 101. Thus, the first adjustment mechanism can reduce or eliminate the backflow formed at the position of the mounting wall 1011 of the volute tongue 101, and the second adjustment mechanism can prevent the backflow airflow from re-entering the impeller of the volute fan when backflow is formed.

[0042] Since a noise detection mechanism is provided at the air outlet 102 of the volute 1 in this application, the noise at the air outlet 102 can be monitored in real time. It is understood that the volute fan provided in this application is used in a range hood. Therefore, in actual application, when the range hood is turned on, the noise detection mechanism can detect the noise at the air outlet 102. Correspondingly, the noise detection mechanism has a preset threshold. When the noise exceeds the threshold, the first adjustment mechanism can be adjusted to rotate relative to the mounting wall 1011, and the second adjustment mechanism can be adjusted to extend relative to the volute tongue 101, thereby reducing or eliminating the backflow airflow at the volute tongue 101, and thus reducing or eliminating the noise at the air outlet 102. Correspondingly, when the noise detected by the noise detection mechanism is lower than the threshold, the first and second adjustment mechanisms remain in their corresponding positions. When the noise is detected to exceed the threshold again, the first and second adjustment mechanisms are further controlled to move, thereby continuing to eliminate the noise.

[0043] When the cigarette is turned off, both the first and second adjustment mechanisms move to their initial positions.

[0044] Optionally, such as Figures 1-3As shown, in this application, the second adjustment mechanism includes a second drive assembly 6 and a second adjustment member. The second drive assembly 6 is disposed outside the volute 1, and the telescopic end of the second drive assembly 6 passes through the volute 1 and is connected to the second adjustment member, so that the second adjustment member moves toward or away from the volute tongue 101.

[0045] In this application, the second drive component 6 is a telescopic structure and can be an electric telescopic rod. The motor of the electric telescopic rod is located outside the volute 1. The telescopic rod passes through the volute 1 and is connected to the second adjustment component, thereby driving the second adjustment component to move relative to the volute tongue 101, thereby blocking the volute tongue 101 to a certain extent and reducing or minimizing the problem of the return airflow re-entering the impeller circulation.

[0046] Optionally, such as Figures 1-3 As shown, the second adjustment component in this application includes a first volute tongue block 7 and a second volute tongue block 8; the number of second drive components 6 corresponds to the number of the first volute tongue blocks 7 and the second volute tongue blocks 8, and the first volute tongue blocks 7 and the second volute tongue blocks 8 are spaced apart along the first direction S1, and the sum of the overall dimensions of the first volute tongue blocks 7 and the second volute tongue blocks 8 is a, and the dimension of the volute 1 in the first direction S1 is b.

[0047] It is understood that the second adjustment component in this application includes the first worm tongue block 7 and the second worm tongue block 8. Correspondingly, the second drive assembly 6 includes the first drive component 601 and the second drive component 602. Both the first drive component 601 and the second drive component 602 can adopt the electric telescopic rod described above, thereby enabling independent adjustment of the first worm tongue block 7 and the second worm tongue block 8.

[0048] The independently adjustable first volute block 7 and second volute block 8 can move the same distance simultaneously, or the distance between the first volute block 7 or the second volute block 8 and the initial position of the volute 101 can be controlled separately, thereby achieving precise control based on the detection results of the noise detection mechanism. Therefore, the noise detection mechanism in this application can include multiple noise sensors, which are spaced apart along the first direction S1, thereby enabling noise detection at the air outlet 102. Taking two noise sensors, corresponding to the positions of the first volute block 7 and the second volute block 8 respectively, as an example, two detection areas are formed at the air outlet 102. When the noise detection values ​​of the two areas are the same, the moving distance of the first volute block 7 and the second volute block 8 is the same. When there is a difference, the distance between the first volute block 7 and the second volute block 8 can be adjusted according to the corresponding value, making the adjustment more targeted and the noise elimination effect better.

[0049] Optionally, such as Figures 1-3As shown, the first adjustment mechanism in this application includes a first drive assembly 5 and a first adjustment member. The first drive assembly 5 is disposed outside the volute 1, and the output end of the first drive assembly 5 passes through the volute 1 and is connected to the first adjustment member. The first adjustment member can rotate relative to the mounting wall 1011 and is in contact with or at an angle to the mounting wall 1011.

[0050] In this application, the first drive component 5 can adopt a telescopic structure, such as an electric telescopic rod. The motor of the electric telescopic rod is located outside the volute 1. The telescopic rod can pass through the volute 1 and connect to the first adjusting member. Accordingly, in this embodiment, one end of the first adjusting member is rotatably connected to the volute 1. The connection method can be to form a folding structure using a hinge or hinge. The telescopic rod is connected to the end of the first adjusting member away from the hinge, thereby enabling the first adjusting member to flip relative to the mounting wall 1011, completing the fitting or angled setting of the first adjusting member with the mounting wall 1011.

[0051] Preferably, the first drive assembly 5 in this application includes a drive motor and a rotating shaft. The rotating shaft extends along the first direction S1 and is fixedly connected to the first adjusting member. One end of the rotating shaft is connected to the output end of the drive motor.

[0052] Since the drive motor in this application needs to be installed outside the volute 1, and the internal space of the smoke fan is limited, this application adopts a drive method of motor and shaft, which can reduce the space occupation of the drive motor and the space occupation during the operation process to a certain extent, so as to arrange and combine it with the volute fan more flexibly.

[0053] Optionally, such as Figure 1 Combination Figure 2 As shown, the first adjustment component includes a first baffle 2, a second baffle 3, and a third baffle 4. The number of first drive components 5 corresponds to the number of the first baffle 2, the second baffle 3, and the third baffle 4. The first baffle 2, the second baffle 3, and the third baffle 4 are arranged sequentially from the volute tongue 101 toward the air outlet 102, and the intervals between the first baffle 2, the second baffle 3, and the third baffle 4 are the same.

[0054] In practical applications, one end of the rotating shaft passes through the volute 1 and is connected to the output end of the motor. The rotating shaft extends along the first direction S1 and is fixedly connected to the corresponding first baffle 2, second baffle 3 and third baffle 4. Thus, when the rotating shaft rotates, it can drive the first baffle 2, second baffle 3 and third baffle 4 to rotate.

[0055] It should be noted that, in this application, the other end of the rotating shaft can be rotatably connected to the side wall of the volute 1 using a bearing or similar structure, ensuring the stability of the overall structure. Furthermore, without considering space and cost, a motor can be added to the other end of the rotating shaft to ensure stable drive.

[0056] More preferably, the first drive assembly 5 in this application further includes a first transmission component and a second transmission component. The first transmission component is connected to the output end of the drive motor, and the second transmission component is connected to one end of the rotating shaft. The first transmission component and the second transmission component are connected in a transmission connection.

[0057] The first and second transmission components in this application can be configured as a combination of a transmission wheel and a conveyor belt. That is, the first transmission component is connected to the output end of the drive motor, and the second transmission component is connected to one end of the rotating shaft. The first and second transmission components are connected by a conveyor belt, thereby enabling the power transmission of the drive motor.

[0058] However, in this application, preferably, the first transmission component and the second transmission component are both gears. The meshing of the gears enables the power of the drive motor to be transmitted to the rotating shaft, and ultimately drives the first baffle 2, the second baffle 3 and the third baffle 4 to rotate.

[0059] Preferably, the first drive assembly 5 in this application includes three drive motors, which correspond to the first baffle 2, the second baffle 3, and the third baffle 4 in this application, respectively. Through the one-to-one correspondence of the drive motors and baffles, independent control and angle adjustment of the first baffle 2, the second baffle 3, and the third baffle 4 can be achieved. This allows for targeted adjustment of the rotation angles of the three baffles according to different noise conditions, thereby reducing or eliminating backflow and ultimately eliminating noise.

[0060] More preferably, in this application, a first groove is formed on one side wall of the volute 1 at the position corresponding to the first baffle 2, a second groove is formed at the position corresponding to the second baffle 3, and a third groove is formed at the position corresponding to the third baffle 4; a first support rod is provided on the first baffle 2 at the position corresponding to the first groove, and one end of the first support rod is located in the first groove; a second support rod is provided on the second baffle 3 at the position corresponding to the second groove, and one end of the second support rod is located in the second groove; a third support rod is provided on the third baffle 4 at the position corresponding to the third groove, and one end of the third support rod is located in the third groove.

[0061] To ensure the adjustment stability of the first baffle 2, the second baffle 3, and the third baffle 4, a first limiting groove, a second limiting groove, and a third limiting groove are formed on the other side wall of the volute 1 corresponding to the positions of the first baffle 2, the second baffle 3, and the third baffle 4. The first limiting groove is opposite to the first sliding groove, the second limiting groove is opposite to the second sliding groove, and the third limiting groove is opposite to the third sliding groove. At the same time, the first support rod, the second support rod, and the third support rod can be a single long rod with both ends extending into the limiting groove and the sliding groove respectively, or they can be two short rods, with one short rod corresponding to the sliding groove and the other short rod corresponding to the limiting groove. This can limit the rotation angle of the first baffle 2, the second baffle 3, and the third baffle 4, and avoid excessive rotation that blocks the air outlet 102 and affects the exhaust efficiency.

[0062] It is understood that the first slide, second slide, third slide, first limiting groove, second limiting groove, and third limiting groove in this application are all arc-shaped, and the movable stroke of the third support rod in the third slide is greater than the movable stroke of the second support rod in the second slide, and the movable stroke of the second support rod in the second slide is greater than the movable stroke of the first support rod in the first slide, so that the rotation angle range of the third baffle 4 is greater than the rotation angle range of the second baffle 3, and the rotation angle range of the second baffle 3 is greater than the rotation angle range of the first baffle 2.

[0063] Since the first baffle 2 is closer to the volute tongue 101, the third baffle 4 is closer to the air outlet 102, and the second baffle 3 is located between the first baffle 2 and the second baffle 3, the backflow area and backflow airflow near the volute tongue 101 are relatively small, while the backflow near the air outlet 102 is larger. Therefore, by making the third baffle 4 have a larger adjustment range and the first baffle 2 have a smaller adjustment range, it is possible to reduce or eliminate backflow and avoid the problem of affecting the air outlet area and air outlet effect due to excessive adjustment.

[0064] In addition, such as Figure 4 As shown, the present invention also provides a backflow prevention adjustment method for a volute fan, comprising the following steps: Step 1: After starting the machine, control the first adjustment mechanism to fit against the mounting wall 1011 and the second adjustment mechanism to contact the volute tongue 101; Step 2: Use a noise detection mechanism to monitor the noise at the position of the first adjustment mechanism, and control the angle of the first adjustment mechanism relative to the mounting wall 1011 and the distance of the second adjustment mechanism relative to the volute tongue 101 according to the noise feedback.

[0065] The adjustment method using the volute fan provided in this application can change the angle between the first adjustment mechanism and the mounting wall 1011 and the distance between the second adjustment mechanism and the volute tongue 101 in real time according to the corresponding power and requirements of the smoke machine, so as to better reduce or eliminate the flue gas backflow, and further avoid the problems of impeller rotation imbalance and flow state disorder caused by the backflow, resulting in flow noise and rotation noise.

[0066] In this application, the opening and closing angles of the first baffle 2, the second baffle 3, and the third baffle 4 are β1, β2, and β3 respectively, and the moving distance of the volute tongue block is h. A noise detection mechanism is set at the outlet position of the volute 1 to detect the noise value in the outlet 102 area. The backflow in the outlet 102 area of the volute tongue 101 will block the air outlet area and reduce the air volume under certain working conditions, resulting in an increase in noise. By monitoring the change of the noise value through this phenomenon and through the coordinated control of the baffle and the volute tongue block, the influence of the backflow on the outlet air flow is reduced, and the problem of backflow near the volute tongue 101 is reduced or even eliminated.

[0067] During actual use, after the user turns on the machine, the opening and closing angles of the three baffles are β1, β2, and β3 and are all 0°. At this time, the baffles are in the closed state, and the moving distances h of the first volute tongue block 7 and the second volute tongue block 8 are 0. The baffles and the volute tongue block are both in the initial positions. At this time, it is judged whether the smoke machine continues to operate, and the gear where the smoke machine is located is identified as the weak gear, the strong gear, or the stir-fry gear.

[0068] When the smoke machine is in the weak gear, it is judged whether the noise value d at the outlet of the smoke machine is less than or equal to d1. If not, the rotation angle of the first baffle 2 is β1 at this time, and the moving distance of the volute tongue block is h = h1. If so, it is then judged whether β1 = b1 and h = 0. If so, the opening and closing angle of the first baffle 2 remains β1 = b1, and the moving distance of the volute tongue block h = h1. If not, the opening and closing angle of the first baffle 2 remains β1 = 0°, h = 0, and continuous monitoring and adjustment are carried out.

[0069] When the smoke machine is in the strong gear, the noise value at the outlet of the smoke machine is divided into three value ranges, which are d21, d22, and d23 (d21 < d22 < d23). When the noise value is at the d21 value, the first baffle 2 and the second baffle 3 rotate, and their rotation angles are β1 and β2, and the volute tongue block moves forward by h, and the moving distance h = h2;

[0070] When the noise value is at the d22 value, the first baffle 2 and the third baffle 4 rotate, and their rotation angles are β1 and β3, and the volute tongue block moves forward by h, and the moving distance h = h3;

[0071] When the noise value is at the d23 value, the second baffle 3 and the third baffle 4 rotate, and their rotation angles are β2 and β3. The tongue block moves forward by h, and the moving distance h = h4, satisfying h1 < h2 < h3 < h4 < h5. At this time, in all three states, it is judged whether the range hood is operating. If so, the position adjustment of the baffle is continued. If it is shut down, the gear is assigned a value of 0, and both the baffle and the tongue block return to their initial states.

[0072] When the range hood is in the stir-fry gear, it is judged whether the noise value d at the outlet of the range hood is less than d3. If not, the rotation angle of the first baffle 2 is β1, the rotation angle of the second baffle 3 is β2, the rotation angle of the third baffle 4 is β3, and the moving distance of the tongue block h = h5. If the range hood continues to operate, then it is further judged whether h = h5, β1 = b1, β2 = b2, and β3 = b3. If so, the opening and closing angle of the first baffle 2 remains β1, the opening and closing angle of the second baffle 3 remains β2, the opening and closing angle of the third baffle 4 remains β3, and the moving distance of the tongue block remains h5. If not, the opening and closing angles of the first baffle 2, the second baffle 3, and the third baffle 4 are β1 = β2 = β3 = 0, the moving distance of the tongue block h = 0, and continuous monitoring and adjustment are carried out.

[0073] It should be noted here that whether it is the adjustment of the first baffle 2 and the tongue block in the weak gear or maintaining the angle of the first baffle 2 and the moving distance of the tongue block, it is necessary to judge whether it is shut down. If it is in the non-shutdown state, the Figure 4 shown steps are looped. If it is shut down, the first baffle 2 and the tongue block are restored.

[0074] Correspondingly, in the strong gear and the stir-fry gear, it is also necessary to judge whether it is shut down. If it is in the non-shutdown state, it is implemented according to the Figure 4 steps, and if it is shut down, the corresponding first baffle 2, second baffle 3, third baffle 4, and first tongue block 7 and second tongue block 8 are restored.

[0075] The above-mentioned tongue block is a general term for the first tongue block 7 and the second tongue block 8. Correspondingly, the adjustment of the tongue block is the synchronous adjustment of the first tongue block 7 and the second tongue block 8.

[0076] 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 principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A volute fan, characterized in that, Includes a volute (1), a first adjustment mechanism, a second adjustment mechanism, and a noise detection mechanism; The volute (1) has a volute tongue (101), the noise detection mechanism is located at the air outlet (102) of the volute (1), the first adjustment mechanism is located on the mounting wall (1011) on the side of the volute tongue (101) facing the air outlet (102), and the first adjustment mechanism extends along the first direction. The two ends of the first adjustment mechanism are respectively in clearance fit with the two side walls of the volute (1) in the first direction, and the first adjustment mechanism can rotate relative to the mounting wall (1011) so that the first adjustment mechanism is in contact with the mounting wall (1011) or set at an angle. The second adjustment mechanism includes a second drive assembly (6) and a second adjustment member. The second adjustment member includes a first volute block (7) and a second volute block (8). The first volute block (7) and the second volute block (8) are consistent with the shape of the volute tongue (101), and the second adjustment mechanism can move towards or away from the volute tongue (101). The angle of the first adjustment mechanism relative to the mounting wall (1011) and the distance of the second adjustment mechanism relative to the volute tongue (101) are controlled according to the noise value monitored by the noise detection mechanism.

2. The volute fan according to claim 1, characterized in that, The second drive component (6) is disposed outside the volute (1), and the telescopic end of the second drive component (6) passes through the volute (1) and is connected to the second adjustment member, so that the second adjustment member moves toward or away from the volute tongue (101).

3. The volute fan according to claim 2, characterized in that, The number of the second drive components (6) corresponds to the number of the first volute block (7) and the second volute block (8), and the first volute block (7) and the second volute block (8) are spaced apart along the first direction. The sum of the overall dimensions of the first volute block (7) and the second volute block (8) is a, and the dimension of the volute (1) in the first direction is b. .

4. The volute fan according to claim 1, characterized in that, The first adjustment mechanism includes a first drive assembly (5) and a first adjustment member. The first drive assembly (5) is disposed outside the volute (1), and the output end of the first drive assembly (5) passes through the volute (1) and is connected to the first adjustment member. The first adjustment member can rotate relative to the mounting wall (1011) and is in contact with or at an angle to the mounting wall (1011).

5. The volute fan according to claim 4, characterized in that, The first drive assembly (5) includes a drive motor and a rotating shaft. The rotating shaft extends along the first direction and is fixedly connected to the first adjusting member. One end of the rotating shaft is connected to the output end of the drive motor.

6. The volute fan according to claim 5, characterized in that, The first drive assembly (5) further includes a first transmission component and a second transmission component. The first transmission component is connected to the output end of the drive motor, and the second transmission component is connected to one end of the rotating shaft. The first transmission component and the second transmission component are connected in a transmission connection.

7. The volute fan according to claim 4, characterized in that, The first adjustment component includes a first baffle (2), a second baffle (3) and a third baffle (4), and the number of the first drive components (5) corresponds to the number of the first baffle (2), the second baffle (3) and the third baffle (4); The first baffle (2), the second baffle (3) and the third baffle (4) are arranged sequentially from the volute tongue (101) toward the air outlet (102), and the first baffle (2), the second baffle (3) and the third baffle (4) are spaced at the same interval.

8. The volute fan according to claim 7, characterized in that, A first groove is formed on the side wall of the volute (1) at the position corresponding to the first baffle (2), a second groove is formed at the position corresponding to the second baffle (3), and a third groove is formed at the position corresponding to the third baffle (4). The first baffle (2) is provided with a first support rod at the position corresponding to the first slide groove, and one end of the first support rod is located inside the first slide groove; The second baffle (3) is provided with a second support rod at the position corresponding to the second slide groove, and one end of the second support rod is located inside the second slide groove; The third baffle (4) is provided with a third support rod at the position corresponding to the third slide groove, and one end of the third support rod is located in the third slide groove.

9. The volute fan according to claim 8, characterized in that, The first slide, the second slide, and the third slide are all arc-shaped, and the movable stroke of the third support rod in the third slide is greater than the movable stroke of the second support rod in the second slide, and the movable stroke of the second support rod in the second slide is greater than the movable stroke of the first support rod in the first slide, so that the rotation angle range of the third baffle (4) is greater than the rotation angle range of the second baffle (3), and the rotation angle range of the second baffle (3) is greater than the rotation angle range of the first baffle (2).

10. A method for preventing backflow adjustment of a volute fan as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: After powering on, control the first adjustment mechanism to fit against the mounting wall (1011), and the second adjustment mechanism to contact the volute tongue (101); Step 2: Use a noise detection mechanism to monitor the noise at the position of the first adjustment mechanism, and control the angle of the first adjustment mechanism relative to the mounting wall (1011) and the distance of the second adjustment mechanism relative to the volute tongue (101) based on the noise feedback.

11. The anti-backflow adjustment method according to claim 10, characterized in that, In step two, controlling the angle of the first adjustment mechanism relative to the mounting wall (1011) and the distance of the second adjustment mechanism relative to the volute tongue (101) based on noise feedback includes: Adjust the angle of the first adjustment mechanism relative to the mounting wall (1011) and the distance of the second adjustment mechanism relative to the volute tongue (101) according to the range hood's speed setting and the noise value detected by the noise detection mechanism; When the range hood is in low power mode, one of the baffles in the first adjustment mechanism is adjusted according to the noise value detected by the noise detection mechanism to reduce the noise value to within the set threshold. When the range hood is in high power mode, the two baffles in the first adjustment mechanism are adjusted according to the noise value detected by the noise detection mechanism, and the distance between the second adjustment mechanism and the volute (101) is adjusted at the same time to reduce the noise value to within the set threshold. When the range hood is in the high-heat setting, all the baffles in the first adjustment mechanism are adjusted according to the noise value detected by the noise detection mechanism, and the distance between the second adjustment mechanism and the volute tongue (101) is adjusted at the same time to reduce the noise value to within the set threshold.

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