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, an adjustment mechanism, a pressure detection mechanism, and a control mechanism; the volute has a volute tongue, the adjustment mechanism is disposed on a mounting wall on the side of the volute tongue facing the air outlet, and the adjustment mechanism is rotatably connected to the mounting wall, forming a detection area with the mounting wall; the pressure detection mechanism is disposed within the detection area, and the pressure detection mechanism is communicatively connected to the control mechanism, which can control the angle between the adjustment mechanism and the mounting wall based on the pressure value detected by the pressure detection mechanism.

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] The present invention provides a volute fan, comprising a volute, an adjusting mechanism, a pressure detection mechanism, and a control mechanism; the volute has a volute tongue, the adjusting mechanism is disposed on the mounting wall on the side of the volute tongue facing the air outlet, and the adjusting mechanism is rotatably connected to the mounting wall and forms a detection area with the mounting wall; the pressure detection mechanism is disposed in the detection area and is communicatively connected to the control mechanism, and the control mechanism can control the angle between the adjusting mechanism and the mounting wall according to the pressure value detected by the pressure detection mechanism.

[0007] As an optional solution for the volute fan, the adjustment mechanism includes a drive assembly and a first adjustment assembly. The drive assembly is located outside the volute, and the output end of the drive assembly passes through the volute and is connected to the first adjustment assembly. The first adjustment assembly can rotate relative to the mounting wall and is either in contact with the mounting wall or at an angle.

[0008] As an optional solution for the volute fan, the first adjustment assembly includes a first adjustment plate, a second adjustment plate, and a third adjustment plate, and the drive assembly includes a first drive component, a second drive component, and a third drive component. The first adjustment plate, the second adjustment plate, and the third adjustment plate are spaced apart along the direction from the volute tongue to the air outlet. The first drive component is correspondingly connected to the first adjustment plate to drive the first adjustment plate to rotate relative to the mounting wall. The second drive component is correspondingly connected to the second adjustment plate to drive the second adjustment plate to rotate relative to the mounting wall. The third drive component is correspondingly connected to the third adjustment plate to drive the third adjustment plate to rotate relative to the mounting wall.

[0009] As an optional solution for the volute fan, pressure detection mechanisms are provided in the detection areas formed between the first adjusting plate and the mounting wall, between the second adjusting plate and the mounting wall, and between the third adjusting plate and the mounting wall.

[0010] As an optional solution for the volute fan, the first drive component, the second drive component, and the third drive component all include a drive motor and a rotating shaft. The rotating shaft is connected to the corresponding first adjustment plate, the second adjustment plate, and the third adjustment plate, and 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 drive assembly also includes a first meshing member and a second meshing member. The first meshing member is connected to the output end of the drive motor, and the second meshing member is connected to one end of the rotating shaft, and the first meshing member and the second meshing member mesh together.

[0012] As an optional solution for the volute fan, a first limiting groove is formed on the side wall of the volute corresponding to the position of the first adjusting plate, a second limiting groove is formed corresponding to the position of the second adjusting plate, and a third limiting groove is formed corresponding to the position of the third adjusting plate; a first support rod is provided on the first adjusting plate corresponding to the position of the first limiting groove, and one end of the first support rod is located in the first limiting groove; a second support rod is provided on the second adjusting plate corresponding to the position of the second limiting groove, and one end of the second support rod is located in the second limiting groove; a third support rod is provided on the third adjusting plate corresponding to the position of the third limiting groove, and one end of the third support rod is located in the third limiting groove.

[0013] As an optional solution for the volute fan, the first, second, and third support rods are all connected to limit wheels at both ends, and the diameter of the limit wheels is greater than the width of the first, second, and third limit grooves.

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

[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, an adjustment mechanism, a pressure detection mechanism, and a control mechanism. The volute has a volute tongue. The adjustment mechanism is disposed on the mounting wall on the side of the volute tongue facing the air outlet, and the adjustment mechanism is rotatably connected to the mounting wall and forms a detection area with the mounting wall. The pressure detection mechanism is disposed in the detection area and is communicatively connected to the control mechanism. The control mechanism can control the angle between the adjustment mechanism and the mounting wall according to the pressure value detected by the pressure detection mechanism.

[0017] Analysis reveals that by installing an adjustment mechanism on the mounting wall on the side of the volute facing the air outlet, allowing the adjustment mechanism to rotate relative to the mounting wall and form a detection area with it, and placing the pressure detection mechanism within this detection area, pressure changes within the area can be detected. Since the pressure detection mechanism in this application is communicatively connected to the control mechanism, the detected pressure signal can be transmitted to the control mechanism, enabling the control mechanism to adjust the angle between the adjustment mechanism and the mounting wall based on the pressure detection mechanism.

[0018] It is understood that the volute fan provided in this application is used in a range hood. Therefore, the control mechanism is the control mechanism inside the range hood. In actual application, when the range hood is turned on, the volute fan starts, and the smoke is discharged from the air outlet of the volute. During this process, the pressure detection mechanism can detect the pressure change in the detection area. When there is no pressure change, the adjustment mechanism is attached to the mounting wall. When the pressure detection mechanism detects pressure, it transmits the pressure signal to the control mechanism, which then uses the control mechanism to rotate the adjustment mechanism until the pressure value in the detection area is zero or close to zero.

[0019] In other words, the pressure detection mechanism in this application can be designed with a threshold. When the pressure exceeds the threshold, the control mechanism controls the adjustment mechanism to rotate. When the pressure is lower than the threshold, the rotation of the adjustment mechanism stops, and the adjustment mechanism remains in the corresponding position. When the pressure detection mechanism detects that the pressure exceeds the threshold again, it can continue to control the rotation of the adjustment mechanism to increase the angle between the adjustment mechanism and the mounting wall, thereby reducing or eliminating backflow.

[0020] In addition, the present invention also provides a backflow prevention adjustment method for a volute fan, comprising the following steps: Step 1: After the machine is turned on, the control mechanism controls the adjustment mechanism to fit against the mounting wall; Step 2: The pressure in the detection area is detected by the pressure detection mechanism, and the pressure value is fed back to the control mechanism, which controls the angle of the adjustment mechanism relative to the mounting wall according to the pressure value.

[0021] As an optional solution for the anti-backflow adjustment method, in step two, the pressure detection mechanism includes detection elements corresponding to the number of adjustment plates included in the first adjustment component. The detection elements are set corresponding to the adjustment plates and are used to detect the detection area corresponding to the adjustment plates. In step two, the control mechanism controls the angle of the adjustment mechanism relative to the mounting wall according to the pressure value and also controls the position of the adjustment plate according to the on or off state of the range hood. When the detection element detects the pressure in the detection area of ​​the adjustment plate, the control mechanism controls the adjustment plate to rotate by the corresponding angle. When the range hood is on, the adjustment plate is held at the corresponding angle, and when the range hood is off, the adjustment plate returns to the initial position.

[0022] The adjustment method using the volute fan provided in this application can change the angle between the adjustment mechanism and the mounting wall in real time according to the corresponding power and demand of the flue gas fan, thereby better reducing or eliminating flue gas backflow. This can avoid the problems of impeller rotation imbalance and flow 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 first-view structural schematic diagram of a volute fan provided in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the arrangement of the drive components in the 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 for Figure 3 A magnified view of a section at point A in the middle;

[0028] Figure 5 This is a schematic diagram of the adjusting mechanism in the volute fan provided in an embodiment of the present invention;

[0029] Figure 6 The logic diagram of the adjustment method provided in the embodiments of the present invention.

[0030] In the diagram: 1-Vortex housing; 101-Vortex tongue; 1011-Mounting wall; 102-Air outlet; 103-First limiting groove; 104-Second limiting groove; 105-Third limiting groove; 2-First adjusting plate; 201-First support rod; 3-Second adjusting plate; 301-Second support rod; 4-Third adjusting plate; 401-Third support rod; 5-First driving component; 6-Second driving component; 7-Third driving component; 8-Rotating shaft; 9-First meshing component; 10-Second meshing component; 11-Limiting wheel. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] like Figure 1As shown, the present invention provides a volute fan, including a volute 1, an adjustment mechanism, a pressure detection mechanism, and a control mechanism; the volute 1 has a volute tongue 101, the adjustment mechanism is disposed on the mounting wall 1011 on the side of the volute tongue 101 facing the air outlet 102, and the adjustment mechanism is rotatably connected to the mounting wall 1011, forming a detection area with the mounting wall 1011; the pressure detection mechanism is disposed in the detection area, and the pressure detection mechanism is communicatively connected to the control mechanism, the control mechanism can control the angle between the adjustment mechanism and the mounting wall 1011 according to the pressure value detected by the pressure detection mechanism.

[0041] Compared with existing technologies, the volute fan provided by this invention has the following advantages:

[0042] The volute fan provided by this invention features an adjustment mechanism mounted on a mounting wall 1011 on the side of the volute tongue 101 facing the air outlet 102. This adjustment mechanism is rotatable relative to the mounting wall 1011, forming a detection area with it. A pressure detection mechanism is positioned within this detection area, enabling the detection of pressure changes within the detection area. Since the pressure detection mechanism is communicatively connected to a control mechanism, the detected pressure signal can be transmitted to the control mechanism, allowing the control mechanism to adjust the angle between the adjustment mechanism and the mounting wall 1011 based on the pressure detection mechanism.

[0043] It is understood that the volute fan provided in this application is used in a range hood. Therefore, the control mechanism is the control mechanism inside the range hood. In actual application, when the range hood is turned on, the volute fan starts, and the flue gas is discharged from the air outlet 102 of the volute 1. During this process, the pressure detection mechanism can detect the pressure change in the detection area. When there is no pressure change, the adjustment mechanism is attached to the mounting wall 1011. When the pressure detection mechanism detects pressure, it transmits the pressure signal to the control mechanism, which then uses the control mechanism to rotate the adjustment mechanism until the pressure value in the detection area is zero or close to zero.

[0044] In other words, the pressure detection mechanism in this application can be designed with a threshold. When the pressure exceeds the threshold, the control mechanism controls the adjustment mechanism to rotate. When the pressure is lower than the threshold, the rotation of the adjustment mechanism stops, and the adjustment mechanism remains in the corresponding position. When the pressure detection mechanism detects that the pressure exceeds the threshold again, it can continue to control the rotation of the adjustment mechanism to increase the angle between the adjustment mechanism and the mounting wall 1011, thereby reducing or eliminating the generation of backflow.

[0045] Optionally, such as Figure 1 Combination Figure 2As shown, the adjustment mechanism in this application includes a drive component and a first adjustment component. The drive component is disposed outside the volute 1, and the output end of the drive component passes through the volute 1 and is connected to the first adjustment component. The first adjustment component can rotate relative to the mounting wall 1011 and is in contact with or at an angle to the mounting wall 1011.

[0046] In this application, the drive component 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 adjustment component. Accordingly, in this embodiment, one end of the first adjustment component is rotatably connected to the volute 1. The connection method can be a hinge or hinge to form a folding structure. The telescopic rod is connected to the end of the first adjustment component away from the hinge, thereby enabling the first adjustment component to flip relative to the mounting wall 1011, completing the fitting or angled setting of the first adjustment component with the mounting wall 1011.

[0047] It should be noted that the first adjustment component and the mounting wall 1011 in this application can be fully fitted or have a certain gap to accommodate the pressure detection mechanism. When fully fitted, the mounting wall 1011 in the detection area can form a receiving groove to accommodate the pressure detection mechanism.

[0048] Optionally, such as Figures 2-5 As shown, the first adjustment assembly in this application includes a first adjustment plate 2, a second adjustment plate 3, and a third adjustment plate 4, and the driving assembly includes a first driving member 5, a second driving member 6, and a third driving member 7. The first adjustment plate 2, the second adjustment plate 3, and the third adjustment plate 4 are spaced apart along the direction from the volute tongue 101 to the air outlet 102. The first driving member 5 is correspondingly connected to the first adjustment plate 2 to drive the first adjustment plate 2 to rotate relative to the mounting wall 1011. The second driving member 6 is correspondingly connected to the second adjustment plate 3 to drive the second adjustment plate 3 to rotate relative to the mounting wall 1011. The third driving member 7 is correspondingly connected to the third adjustment plate 4 to drive the third adjustment plate 4 to rotate relative to the mounting wall 1011.

[0049] By setting a first adjusting plate 2, a second adjusting plate 3, and a third adjusting plate 4 on the mounting wall 1011, more precise partitioning can be achieved. That is, three detection areas can be formed by the three adjusting plates. Furthermore, since the first adjusting plate 2 is provided with a first driving component 5, the second adjusting plate 3 is provided with a second driving component 6, and the third adjusting plate 4 is provided with a third driving component 7, the three adjusting plates can be independently controlled and their angles adjusted. This allows the rotation angles of the three adjusting plates to be adjusted in a targeted manner according to the pressure changes in different areas, thereby reducing or eliminating backflow.

[0050] It should be noted that, in order to ensure the independent adjustment of the first adjusting plate 2, the second adjusting plate 3, and the third adjusting plate 4, pressure detection mechanisms are provided in the detection areas formed between the first adjusting plate 2 and the mounting wall 1011, between the second adjusting plate 3 and the mounting wall 1011, and between the third adjusting plate 4 and the mounting wall 1011 in this application.

[0051] The pressure detection mechanism in this application includes a first detection element, a second detection element, and a third detection element, thereby enabling independent pressure detection in each of the three regions mentioned above. Preferably, the first detection element, the second detection element, and the third detection element in this application are all pressure sensors capable of detecting airflow.

[0052] More preferably, such as Figure 2 Combination Figure 5 As shown, the first driving component 5, the second driving component 6 and the third driving component 7 in this application all include a drive motor and a rotating shaft 8. The rotating shaft 8 is connected to the corresponding first adjusting plate 2, second adjusting plate 3 and third adjusting plate 4, and one end of the rotating shaft 8 is connected to the output end of the drive motor.

[0053] Since the drive component in this application needs to be installed outside the volute 1 and the internal space of the smoke machine is limited, this application adopts a drive method of motor and rotating shaft 8, which can reduce the space occupation of the drive component and the space occupation during the operation process to a certain extent, so that it can be arranged more flexibly and combined with the volute fan.

[0054] In practical applications, one end of the rotating shaft 8 passes through the volute 1 and is connected to the output end of the motor. The rotating shaft 8 extends along the width direction of the volute and is fixedly connected to the corresponding first adjusting plate 2, second adjusting plate 3 and third adjusting plate 4. Thus, when the rotating shaft 8 rotates, it can drive the first adjusting plate 2, second adjusting plate 3 and third adjusting plate 4 to rotate.

[0055] It should be noted that, in this application, the other end of the rotating shaft 8 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 8 to ensure stable drive.

[0056] Optionally, such as Figure 2 Combination Figure 5 As shown, the drive assembly in this application also includes a first meshing member 9 and a second meshing member 10. The first meshing member 9 is connected to the output end of the drive motor, and the second meshing member 10 is connected to one end of the rotating shaft 8, and the first meshing member 9 and the second meshing member 10 mesh together.

[0057] In this application, the first meshing member 9 and the second meshing member 10 are both gears. The motor is located outside the volute 1 and its output end is connected to the first meshing member 9. One end of the rotating shaft 8 extends out of the volute 1 and is connected to the second meshing member 10. Through the meshing of the first meshing member 9 and the second meshing member 10, the power transmission of the motor is realized, thereby realizing the rotation of the first adjusting plate 2, the second adjusting plate 3 and the third adjusting plate 4.

[0058] Optionally, such as Figure 2 Combination Figure 4 As shown, in this application, a first limiting groove 103 is formed on the side wall of the volute 1 at the position corresponding to the first adjusting plate 2, a second limiting groove 104 is formed at the position corresponding to the second adjusting plate 3, and a third limiting groove 105 is formed at the position corresponding to the third adjusting plate 4; a first support rod 201 is provided on the first adjusting plate 2 at the position corresponding to the first limiting groove 103, and one end of the first support rod 201 is located in the first limiting groove 103; a second support rod 301 is provided on the second adjusting plate 3 at the position corresponding to the second limiting groove 104, and one end of the second support rod 301 is located in the second limiting groove 104; a third support rod 401 is provided on the third adjusting plate 4 at the position corresponding to the third limiting groove 105, and one end of the third support rod 401 is located in the third limiting groove 105.

[0059] To prevent over-adjustment of the first adjusting plate 2, the second adjusting plate 3, and the third adjusting plate 4, the sidewall of the volute 1 in this application has a first limiting groove 103, a second limiting groove 104, and a third limiting groove 105 corresponding to the positions of the first adjusting plate 2, the second adjusting plate 3, and the third adjusting plate 4. Simultaneously, the end of the first adjusting plate 2 away from the rotating shaft 8 is provided with a first support rod 201, the end of the second adjusting plate 3 away from the rotating shaft 8 is provided with a second support rod 301, and the end of the third adjusting plate 4 away from the rotating shaft 8 is provided with a third support rod 401. One end of the first support rod 201 extends into the first limiting groove 103, one end of the second support rod 301 extends into the second limiting groove 104, and one end of the third support rod 401 extends into the third limiting groove 105. This allows for the limitation of the rotation angle of the first adjusting plate 2, the second adjusting plate 3, and the third adjusting plate 4, preventing excessive rotation from obstructing the air outlet 102 and affecting exhaust efficiency.

[0060] Preferably, in this application, the two side walls of the volute 1 are formed with a first limiting groove 103, a second limiting groove 104 and a third limiting groove 105. At the same time, the two ends of the first support rod 201, the second support rod 301 and the third support rod 401 are located in the first limiting groove 103, the second limiting groove 104 and the third limiting groove 105 to ensure the stability of the limiting and avoid the problem of jamming.

[0061] More preferably, such as Figure 2 Combination Figure 5As shown, the first support rod 201, the second support rod 301 and the third support rod 401 in this application are all connected to limit wheels 11 at both ends. The diameter of the limit wheels 11 is greater than the width of the first limit groove 103, the second limit groove 104 and the third limit groove 105.

[0062] In this application, the limiting wheel 11 is rotatably connected to the first support rod 201, the second support rod 301, and the third support rod 401, thereby playing a guiding role and converting sliding friction into rolling friction, making the rotation process of the first adjusting plate 2, the second adjusting plate 3, and the third adjusting plate 4 more effortless and smooth.

[0063] Accordingly, since the diameter of the limiting wheel 11 in this application is greater than the width of the first limiting groove 103, the second limiting groove 104 and the third limiting groove 105, it can also play a limiting role, preventing the first support rod 201, the second support rod 301 and the third support rod 401 from moving due to long-term use, causing the ends to detach from the first limiting groove 103, the second limiting groove 104 and the third limiting groove 105.

[0064] Optionally, such as Figure 2 As shown, the first limiting groove 103, the second limiting groove 104, and the third limiting groove 105 in this application are all arc-shaped, and the movable stroke of the third support rod 401 in the third limiting groove 105 is greater than the movable stroke of the second support rod 301 in the second limiting groove 104. The movable stroke of the second support rod 301 in the second limiting groove 104 is greater than the movable stroke of the first support rod 201 in the first limiting groove 103, so that the rotation angle range of the third adjusting plate 4 is greater than the rotation angle range of the second adjusting plate 3, and the rotation angle range of the second adjusting plate 3 is greater than the rotation angle range of the first adjusting plate 2.

[0065] Since the first adjusting plate 2 is closer to the volute tongue 101, the third adjusting plate 4 is closer to the air outlet 102, and the second adjusting plate 3 is located between the first adjusting plate 2 and the second adjusting plate 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 adjusting plate 4 have a larger adjustment range and the first adjusting plate 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.

[0066] In addition, such as Figure 6 As shown, the present invention also provides a backflow prevention adjustment method for a volute fan, comprising the following steps: Step 1: After the machine is turned on, the control mechanism controls the adjustment mechanism to fit against the mounting wall 1011; Step 2: The pressure is detected by the pressure detection mechanism in the detection area and the pressure value is fed back to the control mechanism, and the control mechanism controls the angle of the adjustment mechanism relative to the mounting wall 1011 according to the pressure value.

[0067] As an alternative to the anti-backflow adjustment method, in step two, the pressure detection mechanism includes detection components corresponding to the number of adjustment plates included in the first adjustment component. The detection components are arranged corresponding to the adjustment plates and are used to detect the detection areas corresponding to the adjustment plates; in step two, the control mechanism controls the angle of the adjustment mechanism relative to the installation wall according to the pressure value, and further includes controlling the position of the adjustment plate according to the on or off state of the range hood; when the detection component detects the pressure in the detection area of the adjustment plate, the control mechanism controls the adjustment plate to rotate by a corresponding angle, and when the range hood is in the on state, the adjustment plate remains at the corresponding angle, and when the range hood is in the off state, the adjustment plate returns to the initial position.

[0068] The adjustment method using the volute fan provided in this application can change the angle between the adjustment mechanism and the installation wall 1011 in real time according to the corresponding power and requirements of the range hood, so as to better reduce or eliminate the backflow of flue gas, and further avoid the problems of unbalanced impeller rotation and disordered flow state caused by backflow, resulting in flow noise and rotational noise.

[0069] During actual use, through the first limiting groove 103, the second limiting groove 104, and the third limiting groove 105, the opening and closing angles of the first adjustment plate 2, the second adjustment plate 3, and the third adjustment plate 4 can be β1, β2, and β3 respectively. In this application, the first detection component, the second detection component, and the third detection component are all located at the central position of the detection area, so as to accurately detect the pressure values of the three areas.

[0070] In step one, after the user turns on the machine, the three adjustment plates are in a state of being in contact with the installation wall 1011. Therefore, the opening and closing angles β1 = β2 = β3 = 0°, and the preset pressure values on the three pressure sensors are T1, T2, and T3 respectively.

[0071] When only the first detection component senses the pressure value T1, at this time the opening and closing angle β1 = C1 (0° < C1), which is state 1. At this time, if the range hood is still running, continue to run and detect. If the range hood is turned off, the first adjustment plate 2 returns to the initial position.

[0072] When the first detection component and the second detection component detect the pressure values T1 and T2, then control the first adjustment plate 2 and the second adjustment plate 3. At this time, the rotation angles of the first adjustment plate 2 and the second adjustment plate 3 are β1 = C1, β2 = C2, 0 < C1 < C2, and this is state 2. If the range hood is still running, then judge the states of the first adjustment plate 2, the second adjustment plate 3, and the third adjustment plate 4 at this time through the assignment of a1, a2, and a3, and keep the adjustment plates in this state, and continue to run and detect. If the range hood is turned off, then control the first adjustment plate 2 and the second adjustment plate 3 to return to the initial position.

[0073] When the first detection piece, the second detection piece, and the third detection piece all detect the pressure values T1, T2, and T3, the first adjusting plate 2, the second adjusting plate 3, and the third adjusting plate 4 all need to rotate. At this time, the angles of the first adjusting plate 2, the second adjusting plate 3, and the third adjusting plate 4 are β1 = C1, β2 = C2, β3 = C3, where 0° < C1 < C2 < C3, and it is set to state 3. If the range hood is still running and maintains this state, continuous operation and detection are carried out. If the range hood is turned off, then the first adjusting plate 2, the second adjusting plate 3, and the third adjusting plate 4 return to their initial positions.

[0074] When the first detection piece, the second detection piece, and the third detection piece do not detect the pressure values of T1, T2, and T3, the angles of the adjusting plates at this time are β1 = 0°, β2 = 0°, β3 = 0°, which is state 4, and it is assigned (a1 = 0, a2 = 0, a3 = 0). If the range hood is running without backflow or with little backflow, then the state of the adjusting plate is judged by the assignment of a1, a2, and a3. The adjusting plate is always in the closed state, and continuous detection and regulation are carried out.

[0075] The above assignment can be that when the adjusting plate has a rotation angle, it is assigned 1, indicating that the adjusting plate is in the open state of flipping to prevent backflow. When the adjusting plate does not have a rotation angle, it is assigned 0, indicating that the adjusting plate is in the initial state of not being flipped.

[0076] Since the number of adjusting plates included in this application is three, and the three adjusting plates are arranged in sequence. Therefore, during actual operation, there are only four states: the first detection piece at the position of the first adjusting plate 2 detects pressure; the first adjusting plate 2 and the second adjusting plate 3 detect pressure; the first adjusting plate 2, the second adjusting plate 3, and the third adjusting plate 4 all detect pressure; and no pressure is detected at the positions of the three adjusting plates. There is no state where the first adjusting plate 2 and the third adjusting plate 4 detect pressure while the second adjusting plate 3 does not detect pressure, nor is there a state where the first adjusting plate 2 does not detect pressure while the other two adjusting plates detect pressure. Therefore, by assigning values to the above four states, the corresponding adjusting plates can be quickly reset after the range hood is turned off.

[0077] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A volute fan, characterized in that, Includes a volute (1), an adjustment mechanism, a pressure detection mechanism, and a control mechanism; The volute (1) has a volute tongue (101), and the adjustment mechanism is disposed on the mounting wall (1011) on the side of the volute tongue (101) facing the air outlet (102). The adjustment mechanism is rotatably connected to the mounting wall (1011) and forms a detection area with the mounting wall (1011). The pressure detection mechanism is located within the detection area and is communicatively connected to the control mechanism. The control mechanism can control the angle between the adjustment mechanism and the mounting wall (1011) based on the pressure value detected by the pressure detection mechanism.

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

3. The volute fan according to claim 2, characterized in that, The first adjustment component includes a first adjustment plate (2), a second adjustment plate (3), and a third adjustment plate (4), and the driving component includes a first driving member (5), a second driving member (6), and a third driving member (7); The first adjusting plate (2), the second adjusting plate (3) and the third adjusting plate (4) are spaced apart along the direction from the volute tongue (101) to the air outlet (102). The first driving member (5) is correspondingly connected to the first adjusting plate (2) to drive the first adjusting plate (2) to rotate relative to the mounting wall (1011). The second driving member (6) is correspondingly connected to the second adjusting plate (3) to drive the second adjusting plate (3) to rotate relative to the mounting wall (1011). The third driving member (7) is correspondingly connected to the third adjusting plate (4) to drive the third adjusting plate (4) to rotate relative to the mounting wall (1011).

4. The volute fan according to claim 3, characterized in that, Pressure detection mechanisms are provided in the detection areas formed between the first adjusting plate (2) and the mounting wall (1011), between the second adjusting plate (3) and the mounting wall (1011), and between the third adjusting plate (4) and the mounting wall (1011).

5. The volute fan according to claim 3, characterized in that, The first driving component (5), the second driving component (6) and the third driving component (7) each include a driving motor and a rotating shaft (8). The rotating shaft (8) is connected to the corresponding first adjusting plate (2), second adjusting plate (3) and third adjusting plate (4), and one end of the rotating shaft (8) is connected to the output end of the driving motor.

6. The volute fan according to claim 5, characterized in that, The drive assembly further includes a first meshing member (9) and a second meshing member (10). The first meshing member (9) is connected to the output end of the drive motor, and the second meshing member (10) is connected to one end of the rotating shaft (8). The first meshing member (9) meshes with the second meshing member (10).

7. The volute fan according to claim 4, characterized in that, A first limiting groove (103) is formed on the side wall of the volute (1) at the position corresponding to the first adjusting plate (2), a second limiting groove (104) is formed at the position corresponding to the second adjusting plate (3), and a third limiting groove (105) is formed at the position corresponding to the third adjusting plate (4). The first adjusting plate (2) is provided with a first support rod (201) at the position corresponding to the first limiting groove (103), and one end of the first support rod (201) is located in the first limiting groove (103); The second adjusting plate (3) is provided with a second support rod (301) at the position corresponding to the second limiting groove (104), and one end of the second support rod (301) is located in the second limiting groove (104); The third adjusting plate (4) is provided with a third support rod (401) at the position corresponding to the third limiting groove (105), and one end of the third support rod (401) is located in the third limiting groove (105).

8. The volute fan according to claim 7, characterized in that, Both ends of the first support rod (201), the second support rod (301) and the third support rod (401) are connected to limit wheels (11), and the diameter of the limit wheels (11) is greater than the width of the first limit groove (103), the second limit groove (104) and the third limit groove (105).

9. The volute fan according to claim 7, characterized in that, The first limiting groove (103), the second limiting groove (104), and the third limiting groove (105) are all arc-shaped. The movable stroke of the third support rod (401) in the third limiting groove (105) is greater than the movable stroke of the second support rod (301) in the second limiting groove (104). The movable stroke of the second support rod (301) in the second limiting groove (104) is greater than the movable stroke of the first support rod (201) in the first limiting groove (103). This makes the rotation angle range of the third adjusting plate (4) greater than the rotation angle range of the second adjusting plate (3), and the rotation angle range of the second adjusting plate (3) greater than the rotation angle range of the first adjusting plate (2).

10. A method for preventing backflow adjustment of a volute fan according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: After powering on, the control mechanism controls the adjustment mechanism to fit against the mounting wall (1011); Step 2: Use the pressure detection mechanism to detect the pressure in the detection area and feed the pressure value back to the control mechanism. The control mechanism controls the angle of the adjustment mechanism relative to the mounting wall (1011) based on the pressure value.

11. The anti-backflow adjustment method according to claim 10, characterized in that, In step two, the pressure detection mechanism includes a detection element corresponding to the number of adjustment plates included in the adjustment mechanism. The detection element is set corresponding to the adjustment plate and is used to detect the detection area corresponding to the adjustment plate. In step two, the control mechanism controls the angle of the adjustment mechanism relative to the mounting wall (1011) according to the pressure value, and also controls the position of the adjustment plate according to the on or off state of the range hood; When the detection element detects the pressure in the detection area of ​​the adjustment plate, the control mechanism controls the adjustment plate to rotate by a corresponding angle. When the range hood is on, the adjustment plate remains at the corresponding angle, and when the range hood is off, the adjustment plate returns to its initial position.

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