Volute fan and backflow prevention adjusting method

Abstract

The invention provides a volute fan and an anti-backflow adjusting method, relates to the technical field of extractor hoods, and aims to optimize the structure of the volute fan to a certain extent and reduce backflow airflow at a volute tongue of the volute fan. The invention provides a volute fan. The volute fan comprises a volute, an adjusting mechanism, a pressure detection mechanism and a control mechanism. A volute tongue is formed on the volute, the adjusting mechanism is arranged on a mounting wall on one side, facing the air outlet, of the volute tongue, the adjusting mechanism is rotationally connected with the mounting wall, and the adjusting mechanism and the mounting wall form a detection area; the pressure detection mechanism is arranged in the detection area, the pressure detection mechanism is in communication connection with 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.

Description

Technical Field

[0001] The invention relates to the technical field of range hoods, and in particular to a volute fan and a backflow prevention adjustment method. Background Art

[0002] At present, range hoods have become one of the indispensable kitchen appliances in ordinary households. When the range hood is working, the fumes are sucked and exhausted by running the fan. Generally, household range hoods use multi-blade centrifugal fans for air intake and exhaust.

[0003] Centrifugal fans are generally composed of a volute, a motor, an impeller, etc. The tongue-shaped protrusion in the volute is called the volute tongue, and its main function is to separate the flowing gas and prevent the gas from circulating in the volute. Due to the high gas pressure near the volute tongue, large pressure gradient changes, and complex flow, air flow backflow is likely to occur at the outlet of the volute tongue of the volute. The generation of this backflow phenomenon at the outlet of the volute tongue will cause the impeller to rotate unbalanced and the flow state in the volute to be disordered, thereby generating flow noise and rotation noise.

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

[0005] The object of the present invention is to provide a volute fan and an anti-backflow adjustment method, so as to optimize the volute fan structure to a certain extent and reduce the backflow airflow at the volute tongue of the volute fan.

[0006] A volute fan provided by the present invention includes a volute, an adjusting mechanism, a pressure detecting mechanism and a control mechanism; the volute is formed with a volute tongue, the adjusting mechanism is arranged on a 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 detecting mechanism is arranged in the detection area, and the pressure detecting mechanism 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 detecting mechanism.

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

[0008] As an optional solution for the volute fan, the first adjustment component includes a first adjustment plate, a second adjustment plate and a third adjustment plate, and the drive component includes a first drive member, a second drive member and a third drive member; the first adjustment plate, the second adjustment plate and the third adjustment plate are arranged at intervals in the direction from the volute tongue to the air outlet, the first drive member is connected to the first adjustment plate to drive the first adjustment plate to rotate relative to the mounting wall, the second drive member is connected to the second adjustment plate to drive the second adjustment plate to rotate relative to the mounting wall, and the third drive member is 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 blower, pressure detection mechanisms are provided in the detection areas formed between the first adjustment plate and the mounting wall, between the second adjustment plate and the mounting wall, and between the third adjustment 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 engaging member and a second engaging member, the first engaging member is connected to the output end of the drive motor, the second engaging member is connected to one end of the rotating shaft, and the first engaging member is engaged with the second engaging member.

[0012] As an optional scheme for the volute fan, a first limiting groove is formed on the side wall of the volute and corresponds to the position of the first adjustment plate, a second limiting groove is formed at the position of the second adjustment plate, and a third limiting groove is formed at the position of the third adjustment plate; a first support rod is provided at the position of the first adjustment plate corresponding to 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 at the position of the second adjustment plate corresponding to 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 at the position of the third adjustment plate corresponding to 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, both ends of the first support rod, the second support rod and the third support rod are connected to limiting wheels, and the diameter of the limiting wheel is greater than the width of the first limiting groove, the second limiting groove and the third limiting groove.

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

[0015] Compared with the prior art, the volute fan provided by the present invention has the following advantages:

[0016] The volute fan provided by the present invention comprises a volute, an adjusting mechanism, a pressure detecting mechanism and a control mechanism; the volute is formed with a volute tongue, the adjusting mechanism is arranged 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 detecting mechanism is arranged in the detection area, and the pressure detecting mechanism is communicatively connected with 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 detecting mechanism.

[0017] From this analysis, it can be seen that by setting an adjustment mechanism on the mounting wall on the side of the volute tongue facing the air outlet, and enabling the adjustment mechanism to rotate relative to the mounting wall and form a detection area with the mounting wall, the pressure detection mechanism is set in the detection area, so that the pressure change in the area can be detected by the pressure detection mechanism. Since the pressure detection mechanism in this application is communicatively connected with the control mechanism, the detected pressure signal can be transmitted to the control mechanism, so that the control mechanism can adjust the angle between the adjustment mechanism and the mounting wall according to the pressure detection mechanism.

[0018] It can be understood that the volute fan provided in the present application is used in a range hood. Therefore, the control mechanism is a 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, and when there is no pressure change, the adjustment mechanism is attached to the installation wall. When the pressure detection mechanism detects the pressure, the pressure signal is transmitted to the control mechanism, and the control mechanism is used to realize the rotation of the adjustment mechanism until the pressure value in the detection area is zero or close to zero.

[0019] That is to say, the pressure detection mechanism in the present application can be designed with a threshold value. When the pressure exceeds the threshold value, the control mechanism controls the rotation of the adjusting mechanism. When the pressure value is lower than the threshold value, the rotation of the adjusting mechanism is stopped. At this time, the adjusting mechanism remains in the corresponding position. When the pressure detection mechanism detects that the pressure value exceeds the threshold value again, the rotation of the adjusting mechanism can continue to be controlled, thereby increasing the angle between the adjusting mechanism and the mounting wall and reducing or eliminating the generation of backflow.

[0020] In addition, the present invention also provides a backflow prevention adjustment method for a volute fan, comprising the following steps: step one, after starting up, the control mechanism controls the adjustment mechanism to fit the installation wall; step two, using the pressure detection mechanism to detect the pressure in the detection area, and feeding back the pressure value to the control mechanism, and the control mechanism controls the angle of the adjustment mechanism relative to the installation wall according to the pressure value.

[0021] As an optional scheme of the anti-backflow adjustment method, in step two, the pressure detection mechanism includes detection parts corresponding to the number of adjustment plates included in the first adjustment component, and the detection parts 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 mounting wall according to the pressure value, and also includes controlling the position of the adjustment plate according to the open or closed state of the range hood; when the detection part detects the pressure in the detection area of ​​the adjustment plate, the control mechanism controls the adjustment plate to rotate to the corresponding angle, and when the range hood is in the open state, the adjustment plate is maintained at the corresponding angle, and when the range hood is in the closed state, the adjustment plate returns to the initial position.

[0022] The adjustment method for the volute blower provided in the present 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 range hood, thereby better reducing or eliminating smoke backflow, and further avoiding the problem of unbalanced impeller rotation caused by backflow, and the disordered flow state causing flow noise and rotation noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic structural diagram of a volute blower from a first perspective provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the arrangement of a drive assembly in a volute fan provided by an embodiment of the present invention;

[0026] Figure 3 A schematic structural diagram of a volute blower from a second viewing angle provided by an embodiment of the present invention;

[0027] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0028] Figure 5 A schematic diagram of the structure of an adjustment mechanism in a volute fan provided by an embodiment of the present invention;

[0029] Figure 6 A logic diagram of the adjustment method provided in an embodiment of the present invention.

[0030] In the figure: 1-volute; 101-volute 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 member; 6-second driving member; 7-third driving member; 8-rotating shaft; 9-first meshing member; 10-second meshing member; 11-limiting wheel. DETAILED DESCRIPTION

[0031] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0032] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

[0036] For ease of description, spatial relative terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the drawings. Such spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings.

[0037] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0038] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0039] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application. In addition, the technical solutions between the various embodiments may be combined with each other, but must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be considered that the combination of such technical solutions does not exist and is not within the scope of protection required by the present application.

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

[0041] Compared with the prior art, the volute fan provided by the present invention has the following advantages:

[0042] The volute fan provided by the present invention is provided with an adjustment mechanism on the mounting wall 1011 on the side of the volute tongue 101 facing the air outlet 102, and the adjustment mechanism is able to rotate relative to the mounting wall 1011 and form a detection area with the mounting wall 1011, and the pressure detection mechanism is arranged in the detection area, so that the pressure change in the detection area can be detected by the pressure detection mechanism. Since the pressure detection mechanism in the present application is communicatively connected with the control mechanism, the detected pressure signal can be transmitted to the control mechanism, so that the control mechanism can adjust the angle between the adjustment mechanism and the mounting wall 1011 according to the pressure detection mechanism.

[0043] It can be understood that the volute fan provided in the present application is used in a range hood, and therefore the control mechanism is a 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 102 of the volute 1. During this process, the pressure detection mechanism can detect the pressure change in the detection area, and when there is no pressure change, the adjustment mechanism is attached to the mounting wall 1011, and when the pressure detection mechanism detects the pressure, the pressure signal is transmitted to the control mechanism, and the control mechanism is used to realize the rotation of the adjustment mechanism until the pressure value in the detection area is zero or close to zero.

[0044] That is to say, the pressure detection mechanism in the present application can be designed with a threshold. When the pressure exceeds the threshold, the control mechanism controls the rotation of the adjusting mechanism. When the pressure value is lower than the threshold, the rotation of the adjusting mechanism is stopped. At this time, the adjusting mechanism remains in the corresponding position. When the pressure detection mechanism detects that the pressure value exceeds the threshold again, the rotation of the adjusting mechanism can continue to be controlled, thereby increasing the angle between the adjusting mechanism and the mounting wall 1011 and reducing or eliminating the generation of backflow.

[0045] Alternatively, if Figure 1 Combination Figure 2As shown, the adjustment mechanism in the present application includes a driving component and a first adjusting component. The driving component is arranged outside the volute 1, and the output end of the driving component passes through the volute 1 and is connected to the first adjusting component. The first adjusting 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 the present application, the driving 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, and the telescopic rod can pass through the volute 1 and be connected to the first adjustment component. Accordingly, in the present embodiment, one end of the first adjustment component is rotatably connected to the volute 1, and the connection method can adopt a hinge or hinge to form a folding structure, and the telescopic rod is connected to the end of the first adjustment component away from the hinge, so that the first adjustment component can be flipped relative to the mounting wall 1011, thereby completing the fitting or angle setting of the first adjustment component and the mounting wall 1011.

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

[0048] Alternatively, if Figure 2-Figure 5 As shown, the first adjustment component in the present application 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 adjustment plate 2, the second adjustment plate 3 and the third adjustment plate 4 are arranged at intervals along the direction from the snail tongue 101 to the air outlet 102, the first driving member 5 is 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 connected to the second adjustment plate 3 to drive the second adjustment plate 3 to rotate relative to the mounting wall 1011, and the third driving member 7 is connected to the third adjustment plate 4 to drive the third adjustment plate 4 to rotate relative to the mounting wall 1011.

[0049] By arranging the first adjustment plate 2, the second adjustment plate 3 and the third adjustment plate 4 on the mounting wall 1011, more refined zoning can be achieved, that is, three detection areas can be formed correspondingly by using the three adjustment plates, and since the first adjustment plate 2 in the present application is correspondingly provided with a first driving member 5, the second adjustment plate 3 is correspondingly provided with a second driving member 6, and the third adjustment plate 4 is correspondingly provided with a third driving member 7, it is possible to achieve independent control and angle adjustment of the three adjustment plates, so that the rotation angle of the three adjustment plates can be adjusted in a targeted manner according to the pressure changes in different areas, thereby achieving the purpose of reducing or eliminating backflow.

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

[0051] The pressure detection mechanism in the present application includes a first detection member, a second detection member and a third detection member, so as to correspond to the above three areas and realize independent pressure detection in each area. Preferably, the first detection member, the second detection member and the third detection member in the present application are all pressure sensors capable of detecting airflow.

[0052] More preferably, if Figure 2 Combination Figure 5 As shown, the first driving member 5, the second driving member 6 and the third driving member 7 in the present application all include a driving motor and a rotating shaft 8, the rotating shaft 8 is connected to the corresponding first adjustment plate 2, the second adjustment plate 3 and the third adjustment plate 4, and one end of the rotating shaft 8 is connected to the output end of the driving motor.

[0053] Since the drive component in the present application needs to be arranged outside the volute 1 and the internal space of the range hood is limited, the present application adopts a drive method of a motor and a rotating shaft 8, which can reduce the space occupied by the drive component and the space occupied during the operation process to a certain extent, thereby enabling a more flexible arrangement and combination with the volute fan.

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

[0055] It should be noted that the other end of the rotating shaft 8 and the side wall of the volute 1 can be connected to each other by a bearing or other structure to ensure the stability of the overall structure. If space and cost are not considered, a motor can be further added to the other end of the rotating shaft 8 to ensure stable driving.

[0056] Alternatively, if Figure 2 Combination Figure 5 As shown, the driving assembly in the present application also includes a first engaging member 9 and a second engaging member 10, the first engaging member 9 is connected to the output end of the driving motor, the second engaging member 10 is connected to one end of the rotating shaft 8, and the first engaging member 9 and the second engaging member 10 are engaged with each other.

[0057] In the present application, the first meshing member 9 and the second meshing member 10 are both gears. The motor is arranged outside the volute 1, and the 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 adjustment plate 2, the second adjustment plate 3 and the third adjustment plate 4.

[0058] Alternatively, if Figure 2 Combination Figure 4 As shown, a first limiting groove 103 is formed on the side wall of the volute 1 in the present application and corresponds to the position of the first adjusting plate 2, a second limiting groove 104 is formed at the position of the second adjusting plate 3, and a third limiting groove 105 is formed at the position of the third adjusting plate 4; a first support rod 201 is provided at the position of the first adjusting plate 2 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 at the position of the second adjusting plate 3 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 at the position of the third adjusting plate 4 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] In order to avoid excessive adjustment of the first adjustment plate 2, the second adjustment plate 3 and the third adjustment plate 4, the side wall of the volute 1 in the present application and the positions corresponding to the first adjustment plate 2, the second adjustment plate 3 and the third adjustment plate 4 are formed with a first limiting groove 103, a second limiting groove 104 and a third limiting groove 105. At the same time, a first support rod 201 is provided at one end of the first adjustment plate 2 away from the rotating shaft 8, a second support rod 301 is provided at one end of the second adjustment plate 3 away from the rotating shaft 8, and a third support rod 401 is provided at one end of the third adjustment plate 4 away from the rotating shaft 8, and 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, thereby realizing the limitation of the rotation angle of the first adjustment plate 2, the second adjustment plate 3 and the third adjustment plate 4, avoiding the problem of excessive rotation blocking the air outlet 102 and affecting the exhaust efficiency.

[0060] Preferably, in the present application, both 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, both 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 sticking.

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

[0062] The limiting wheel 11 in the present application is rotatably connected to the first support rod 201, the second support rod 301 and the third support rod 401, so that it can play a guiding role, convert sliding friction into rolling friction, and make the rotation process of the first adjustment plate 2, the second adjustment plate 3 and the third adjustment plate 4 more labor-saving and smooth.

[0063] Correspondingly, since the diameter of the limiting wheel 11 in the present 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 to prevent the first support rod 201, the second support rod 301 and the third support rod 401 from moving due to long-term use, resulting in the end portions being separated from the first limiting groove 103, the second limiting groove 104 and the third limiting groove 105.

[0064] Alternatively, if Figure 2 As shown, the first limiting groove 103, the second limiting groove 104 and the third limiting groove 105 in the present 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, and 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 adjustment plate 4 is greater than the rotation angle range of the second adjustment plate 3, and the rotation angle range of the second adjustment plate 3 is greater than the rotation angle range of the first adjustment plate 2.

[0065] Since in the present application the first adjustment plate 2 is closer to the volute tongue 101, the third adjustment plate 4 is closer to the air outlet 102, and the second adjustment plate 3 is located between the first adjustment plate 2 and the second adjustment plate 3, and the reflow area and the reflow airflow near the volute tongue 101 are relatively small, and the reflow airflow near the air outlet 102 is larger, therefore, by making the third adjustment plate 4 have a larger adjustment range and the first adjustment plate 2 have a smaller adjustment range, it is possible to reduce or eliminate the reflow and avoid the problem of excessive adjustment affecting the air outlet area and air outlet effect.

[0066] In addition, if Figure 6 As shown, the present invention also provides a backflow prevention adjustment method for a volute fan, comprising the following steps: step one, after starting up, the control mechanism controls the adjustment mechanism to fit with the installation wall 1011; step two, using the pressure detection mechanism to detect the pressure in the detection area, and feeding back the pressure value to the control mechanism, and the control mechanism controls the angle of the adjustment mechanism relative to the installation wall 1011 according to the pressure value.

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

[0068] The regulation method using the volute fan provided by this application can change the angle between the regulating mechanism and the mounting 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] In 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 regulating plate 2, the second regulating plate 3, and the third regulating plate 4 can be β1, β2, and β3 respectively. And in this application, the first detection component, the second detection component, and the third detection component are all located at the central positions of the detection areas, 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 regulating plates are in a state of being attached to the mounting 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 regulating 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 regulate the first regulating plate 2 and the second regulating plate 3. At this time, the rotation angles of the first regulating plate 2 and the second regulating 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 regulating plate 2, the second regulating plate 3, and the third regulating plate 4 at this time through the assignment of a1, a2, and a3, and keep the regulating plates in this state, and continue to run and detect. If the range hood is turned off, then control the first regulating plate 2 and the second regulating 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 adjustment plate 2, the second adjustment plate 3, and the third adjustment plate 4 all need to rotate. At this time, the angles of the first adjustment plate 2, the second adjustment plate 3, and the third adjustment 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 adjustment plate 2, the second adjustment plate 3, and the third adjustment 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, at this time, the angles of the adjustment plates are β1 = 0°, β2 = 0°, β3 = 0°, which is state 4, and it is assigned as (a1 = 0, a2 = 0, a3 = 0). If the range hood is running without backflow or with little backflow, then the state of the adjustment plate is judged by the assignment of a1, a2, and a3. The adjustment plate is always in the closed state, and continuous detection and regulation are carried out.

[0075] The above assignment can be that when the adjustment plate has a rotation angle, it is assigned 1, which proves that the adjustment plate is in the open state of flipping to prevent backflow. When the adjustment plate does not have a rotation angle, it is assigned 0, which proves that the adjustment plate is in the initial state without flipping.

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

[0077] 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: It comprises a volute (1), an adjusting mechanism, a pressure detecting mechanism and a control mechanism; The volute (1) is formed with a volute tongue (101), the adjustment mechanism is arranged on a mounting wall (1011) on a side of the volute tongue (101) facing the air outlet (102), and 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 arranged in the detection area, and the pressure detection mechanism is communicatively connected with the control mechanism, and the control mechanism can control the angle between the adjustment mechanism and the installation wall (1011) according to the pressure value detected by the pressure detection mechanism.

2. The volute blower according to claim 1, characterized in that: The adjustment mechanism comprises a drive component and a first adjustment component, the drive component is arranged 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 installation wall (1011) and is in contact with or arranged at an angle to the installation wall (1011).

3. The volute fan according to claim 2, characterized in that: The first adjustment assembly comprises a first adjustment plate (2), a second adjustment plate (3) and a third adjustment plate (4); the driving assembly comprises 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 arranged at intervals along the direction from the volute tongue (101) to the air outlet (102); the first driving member (5) is connected to the first adjustment plate (2) to drive the first adjustment plate (2) to rotate relative to the installation wall (1011); the second driving member (6) is connected to the second adjustment plate (3) to drive the second adjustment plate (3) to rotate relative to the installation wall (1011); and the third driving member (7) is connected to the third adjustment plate (4) to drive the third adjustment plate (4) to rotate relative to the installation 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 adjustment plate (2) and the mounting wall (1011), between the second adjustment plate (3) and the mounting wall (1011), and between the third adjustment plate (4) and the mounting wall (1011).

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

6. The volute blower according to claim 5, characterized in that: The driving assembly further comprises a first engaging member (9) and a second engaging member (10), wherein the first engaging member (9) is connected to the output end of the driving motor, and the second engaging member (10) is connected to one end of the rotating shaft (8), and the first engaging member (9) is engaged with the second engaging member (10).

7. The volute blower according to claim 4, characterized in that: A first limiting groove (103) is formed on the side wall of the volute (1) at a position corresponding to the first adjusting plate (2), a second limiting groove (104) is formed at a position corresponding to the second adjusting plate (3), and a third limiting groove (105) is formed at a position corresponding to the third adjusting plate (4); A first support rod (201) is provided on the first adjustment plate (2) at a 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 adjustment plate (3) at a 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 at a position of the third adjustment plate (4) 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 blower 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 limiting wheels (11), and the diameter of the limiting wheel (11) is greater than the width of the first limiting groove (103), the second limiting groove (104) and the third limiting groove (105).

9. The volute blower 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, 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), and 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 adjustment plate (4) is greater than the rotation angle range of the second adjustment plate (3), and the rotation angle range of the second adjustment plate (3) is greater than the rotation angle range of the first adjustment plate (2).

10. A backflow prevention adjustment method for a volute fan according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: After starting up, the control mechanism controls the adjustment mechanism to fit the installation wall (1011); Step 2: Use the pressure detection mechanism to detect the pressure in the detection area, and feed back the pressure value to the control mechanism, and the control mechanism controls the angle of the adjustment mechanism relative to the installation wall (1011) according to the pressure value.

11. The backflow prevention adjustment method according to claim 10, characterized in that: In step 2, the pressure detection mechanism includes detection members corresponding to the number of adjustment plates included in the adjustment mechanism, and the detection members are arranged corresponding to the adjustment plates and are used to detect the detection area corresponding to the adjustment plates; In step 2, the control mechanism controls the angle of the adjustment mechanism relative to the installation wall (1011) 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 member detects the pressure in the detection area of ​​the adjustment plate, the control mechanism controls the adjustment plate to rotate a corresponding angle, and when the range hood is in an on state, the adjustment plate remains at the corresponding angle, and when the range hood is in a off state, the adjustment plate returns to its initial position.

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