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 volute fan comprises a volute, a first adjusting mechanism, a second adjusting mechanism and a noise detection mechanism. A volute tongue is formed on the volute, the noise detection mechanism is arranged at an air outlet of the volute, the first adjusting mechanism is arranged on the mounting wall of the side, facing the air outlet, of the volute tongue, the two ends of the first adjusting mechanism are in clearance fit with the two side walls, in the first direction, of the volute correspondingly, and the first adjusting mechanism can rotate relative to the mounting wall. The first adjusting mechanism and the mounting wall are attached to each other or arranged at an angle; the second adjusting mechanism is consistent with the volute tongue in shape, and the second adjusting mechanism can move in the direction close to or away from the volute tongue.

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 comprises a volute, a first adjusting mechanism, a second adjusting mechanism and a noise detection mechanism; the volute is formed with a volute tongue, the noise detection mechanism is arranged at the air outlet of the volute, the first adjusting mechanism is arranged on the mounting wall on the side of the volute tongue facing the air outlet, and the first adjusting mechanism extends along a first direction, the two ends of the first adjusting mechanism are respectively matched with the gaps on the two side walls of the volute in the first direction, and the first adjusting mechanism can rotate relative to the mounting wall so that the first adjusting mechanism and the mounting wall are in contact or arranged at an angle; the second adjusting mechanism is consistent with the shape of the volute tongue, and the second adjusting mechanism can move in a direction close to or away from the volute tongue.

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

[0008] As an optional solution for the volute fan, the second adjusting member includes a first volute tongue block and a second volute tongue block; the number of the second driving components is set corresponding to the first volute tongue block and the second volute tongue block, and the first volute tongue block and the second volute tongue block are arranged at intervals along the first direction, and the sum of the overall dimensions of the first volute tongue block and the second volute tongue block is a, and the dimension of the volute in the first direction is b,

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

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

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

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

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

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

[0015] Compared with 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, a first adjusting mechanism, a second adjusting mechanism and a noise detection mechanism; the volute is formed with a volute tongue, the noise detection mechanism is arranged at the air outlet of the volute, the first adjusting mechanism is arranged on the mounting wall on the side of the volute tongue facing the air outlet, and the first adjusting mechanism extends along the first direction, the two ends of the first adjusting mechanism are respectively matched with the gaps on the two side walls of the volute in the first direction, and the first adjusting mechanism can rotate relative to the mounting wall so that the first adjusting mechanism and the mounting wall are in contact or arranged at an angle; the second adjusting mechanism is consistent with the shape of the volute tongue, and the second adjusting mechanism can move in a direction close to or away from the volute tongue.

[0017] From this analysis, it can be seen that by setting a first adjusting mechanism on the mounting wall where the volute tongue faces the air outlet, and enabling the first adjusting mechanism in the present application to rotate relative to the mounting wall, a second adjusting mechanism is provided at the position corresponding to the volute tongue, and the second adjusting mechanism can move in the direction close to or away from the volute tongue, so that the backflow formed at the mounting wall position of the volute tongue can be reduced or eliminated through the first adjusting mechanism, and the second adjusting mechanism can resist the backflow airflow from entering the impeller of the volute fan again when the backflow is formed.

[0018] Since the air outlet of the volute in the present application is provided with a noise detection mechanism, the noise at the air outlet can be monitored in real time through the noise detection mechanism. It can be understood that the volute fan provided by the present application is used in a range hood. Therefore, in actual application, when the range hood is turned on, the noise detection mechanism can detect the noise at the air outlet. Accordingly, the noise detection mechanism is preset with a threshold. When the noise exceeds the threshold, the first adjustment mechanism can be adjusted to rotate relative to the mounting wall, and the second adjustment mechanism can be extended relative to the volute tongue, so that the backflow airflow at the volute tongue can be reduced or eliminated, thereby reducing or eliminating the noise at the air outlet. Accordingly, when the noise detected by the noise detection mechanism is lower than the threshold, the first adjustment mechanism and the second adjustment mechanism remain in the corresponding position, and when the noise is detected to exceed the threshold again, the first adjustment mechanism and the second adjustment mechanism are further controlled to move, so as to continue to eliminate the noise.

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

[0020] In addition, the present invention also provides a backflow prevention adjustment method for a volute fan, comprising the following steps: step one, after starting up, controlling the first adjustment mechanism to fit against the mounting wall and the second adjustment mechanism to contact the volute tongue; step two, using a noise detection mechanism to monitor the noise at the position of the first adjustment mechanism, and controlling the angle of the first adjustment mechanism relative to the mounting wall and the distance of the second adjustment mechanism relative to the volute tongue based on noise feedback.

[0021] As an optional scheme for the anti-backflow adjustment method, in step 2, controlling the angle of the first adjustment mechanism relative to the mounting wall and the distance of the second adjustment mechanism relative to the volute tongue according to noise feedback includes: adjusting the angle of the first adjustment mechanism relative to the mounting wall and the distance of the second adjustment mechanism relative to the volute tongue according to the gear position of the range hood and the noise value detected by the noise detection mechanism; when the range hood is in the weak gear, adjusting a baffle in the first adjustment mechanism according to the noise value detected by the noise detection mechanism to reduce the noise value to within a set threshold; when the range hood is in the strong gear, adjusting the two baffles in the first adjustment mechanism according to the noise value detected by the noise detection mechanism, and adjusting the distance between the second adjustment mechanism and the volute tongue at the same time to reduce the noise value to within the set threshold; when the range hood is in the stir-fry gear, adjusting all the baffles in the first adjustment mechanism according to the noise value detected by the noise detection mechanism, and adjusting the distance between the second adjustment mechanism and the volute tongue at the same time to reduce the noise value to within the set threshold.

[0022] The adjustment method for the volute blower provided in the present application can change the angle between the first adjustment mechanism and the mounting wall and the distance between the second adjustment mechanism and the volute tongue in real time according to the corresponding power and demand of the 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 diagram of the internal structure of a volute fan provided by an embodiment of the present invention;

[0025] Figure 2 A schematic structural diagram of a volute blower from a first perspective 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 A logic diagram of the anti-backflow adjustment method provided in an embodiment of the present invention.

[0028] In the figure: 1-volute; 101-volute tongue; 1011-mounting wall; 102-air outlet; 2-first baffle; 3-second baffle; 4-third baffle; 5-first drive assembly; 6-second drive assembly; 601-first drive member; 602-second drive member; 7-first volute tongue block; 8-second volute tongue block;

[0029] S1 - first direction. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

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

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] like Figure 1-Figure 3As shown, the present invention provides a volute fan, including a volute 1, a first adjusting mechanism, a second adjusting mechanism and a noise detection mechanism; the volute 1 is formed with a volute tongue 101, the noise detection mechanism is arranged at the air outlet 102 of the volute 1, the first adjusting mechanism is arranged on the mounting wall 1011 on the side of the volute tongue 101 facing the air outlet 102, and the first adjusting mechanism extends along the first direction S1, the two ends of the first adjusting mechanism are respectively matched with the gap of the two side walls of the volute 1 in the first direction S1, and the first adjusting mechanism can rotate relative to the mounting wall 1011, so that the first adjusting mechanism and the mounting wall 1011 are in contact or arranged at an angle; the second adjusting mechanism is consistent with the shape of the volute tongue 101, and the second adjusting mechanism can move in the direction close to or away from the volute tongue 101.

[0040] Compared with the prior art, the volute fan provided by the present invention has the following advantages:

[0041] The volute fan provided by the present invention is provided with a first adjusting mechanism on the mounting wall 1011 at the position of the volute tongue 101 facing the air outlet 102, and the first adjusting mechanism in the present application is able to rotate relative to the mounting wall 1011, and a second adjusting mechanism is provided at the position corresponding to the volute tongue 101, and the second adjusting mechanism can move in a direction close to or away from the volute tongue 101, so that the backflow formed at the position of the mounting wall 1011 of the volute tongue 101 can be reduced or eliminated through the first adjusting mechanism, and when the backflow is formed, the resistance value backflow airflow can re-enter the impeller of the volute fan through the second adjusting mechanism.

[0042] Since the air outlet 102 of the volute 1 in the present application is provided with a noise detection mechanism, the noise at the air outlet 102 can be monitored in real time through the noise detection mechanism. It can be understood that the volute fan provided in the present application is used in a range hood. Therefore, in actual application, when the range hood is turned on, the noise detection mechanism can detect the noise at the air outlet 102. Accordingly, the noise detection mechanism is preset with a threshold. When the noise exceeds the threshold, the first adjustment mechanism can be adjusted to rotate relative to the mounting wall 1011, and the second adjustment mechanism can be extended relative to the volute tongue 101, so that the backflow airflow at the volute tongue 101 can be reduced or eliminated, and the noise at the air outlet 102 can be reduced or eliminated. Accordingly, when the noise detected by the noise detection mechanism is lower than the threshold, the first adjustment mechanism and the second adjustment mechanism remain at the corresponding position, and when the noise is detected to exceed the threshold again, the first adjustment mechanism and the second adjustment mechanism are further controlled to move, so as to continue to eliminate the noise.

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

[0044] Alternatively, if Figure 1-Figure 3As shown, in the present application, the second adjustment mechanism includes a second drive assembly 6 and a second adjustment member. The second drive assembly 6 is arranged outside the volute 1, and the telescopic end of the second drive assembly 6 passes through the volute 1 and is connected to the second adjustment member, so that the second adjustment member moves toward or away from the volute tongue 101.

[0045] In the present application, the second drive assembly 6 is a telescopic structure, and an electric telescopic rod can be used. The motor of the electric telescopic rod is arranged outside the volute 1. The telescopic rod passes through the volute 1 and is connected to the second adjusting member, thereby being able to drive the second adjusting member to move relative to the volute tongue 101, thereby achieving a certain degree of shielding of the volute tongue 101, thereby reducing or lowering the problem of the return airflow re-entering the impeller circulation.

[0046] Alternatively, if Figure 1-Figure 3 As shown, the second adjusting member in the present application includes a first volute tongue block 7 and a second volute tongue block 8; the number of the second driving components 6 is arranged corresponding to the first volute tongue block 7 and the second volute tongue block 8, and the first volute tongue block 7 and the second volute tongue block 8 are arranged at intervals along the first direction S1, and the sum of the overall dimensions of the first volute tongue block 7 and the second volute tongue block 8 is a, and the dimension of the volute 1 in the first direction S1 is b,

[0047] It can be understood that the second adjustment member in the present application includes a first worm tongue block 7 and a second worm tongue block 8, and correspondingly, the second drive assembly 6 includes a first drive member 601 and a second drive member 602, and the first drive member 601 and the second drive member 602 can both adopt the above-mentioned electric telescopic rod, thereby enabling independent adjustment of the first worm tongue block 7 and the second worm tongue block 8.

[0048] The independently adjusted first volute tongue block 7 and second volute tongue block 8 can move the same distance at the same time, or can respectively control the distance of the first volute tongue block 7 or the second volute tongue block 8 relative to the initial position of the volute tongue 101, thereby realizing precise control according to the detection situation of the noise detection mechanism. Therefore, the noise detection mechanism in the present application can include a plurality of noise sensors, and the plurality of noise sensors are arranged at intervals along the first direction S1, so that the position of the air outlet 102 can be detected for noise. For example, two noise sensors are arranged, and they correspond to the setting positions of the first volute tongue block 7 and the second volute tongue block 8 respectively, and two detection areas are formed at the air outlet 102. When the noise detection values ​​of the two areas are consistent, the moving distances of the first volute tongue block 7 and the second volute tongue block 8 are the same. When there is a difference, the distance between the first volute tongue block 7 and the second volute tongue block 8 can be adjusted according to the corresponding numerical value, so that the adjustment is more targeted and the noise elimination effect is better.

[0049] Alternatively, if Figure 1-Figure 3As shown, the first adjustment mechanism in the present application includes a first drive component 5 and a first adjustment member. The first drive component 5 is arranged outside the volute 1, and the output end of the first drive component 5 passes through the volute 1 and is connected to the first adjustment member. The first adjustment member can rotate relative to the installation wall 1011 and is in contact with or at an angle to the installation wall 1011.

[0050] In the present application, the first drive assembly 5 can adopt a telescopic structure, such as an electric telescopic rod, the motor of the electric telescopic rod is located outside the volute 1, and the telescopic rod can pass through the volute 1 and be connected to the first adjusting member. Accordingly, in the present embodiment, one end of the first adjusting member 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 adjusting member away from the hinge, so that the first adjusting member can be flipped relative to the mounting wall 1011, thereby completing the fitting or angle setting of the first adjusting member and the mounting wall 1011.

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

[0052] Since the driving motor 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 motor and a rotating shaft driving method, which can reduce the space occupied by the driving motor and the space occupied during the operation process to a certain extent, thereby enabling a more flexible arrangement and combination with the volute fan.

[0053] Alternatively, if Figure 1 Combination Figure 2 As shown, the first adjusting member includes a first baffle 2, a second baffle 3 and a third baffle 4, and the number of the first driving components 5 corresponds to the first baffle 2, the second baffle 3 and the third baffle 4; the first baffle 2, the second baffle 3 and the third baffle 4 are arranged in sequence from the volute tongue 101 to the direction of the air outlet 102, and the intervals between the first baffle 2, the second baffle 3 and the third baffle 4 are the same.

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

[0055] It should be noted that the other end of the rotating shaft in the present application can be connected to the side wall of the volute 1 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 to ensure stable driving.

[0056] Further preferably, the first drive assembly 5 in the present application also includes a first transmission member and a second transmission member, the first transmission member is connected to the output end of the drive motor, the second transmission member is connected to one end of the rotating shaft, and the first transmission member is transmission-connected to the second transmission member.

[0057] The first transmission member and the second transmission member in the present application can be in the form of a combination of a transmission wheel and a conveyor belt, that is, the first transmission member is connected to the output end of the driving motor, and the second transmission member is connected to one end of the rotating shaft. The first transmission member and the second transmission member are connected by a conveyor belt transmission, thereby realizing the power transmission of the driving motor.

[0058] However, in the present application, preferably, both the first transmission member and the second transmission member are gears, and the power of the drive motor is transmitted to the rotating shaft through the meshing of the gears, and ultimately drives the first baffle 2, the second baffle 3 and the third baffle 4 to rotate.

[0059] Preferably, the first drive assembly 5 in the present application includes three drive motors, which respectively correspond to the first baffle 2, the second baffle 3 and the third baffle 4 in the present application. The first baffle 2, the second baffle 3 and the third baffle 4 can be independently controlled and angle-adjusted through the one-to-one corresponding drive motors and baffles, so that the rotation angles of the three baffles can be adjusted in a targeted manner according to different noise conditions, so as to reduce or eliminate the backflow and finally eliminate the noise.

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

[0061] To ensure the adjustment stability of the first baffle 2, the second baffle 3 and the third baffle 4, a first limiting groove, a second limiting groove and a third limiting groove are formed on the other side wall of the volute 1 in the present application and corresponding to the positions of the first baffle 2, the second baffle 3 and the third baffle 4. The first limiting groove is arranged opposite to the first slide groove, the second limiting groove is arranged opposite to the second slide groove, and the third limiting groove is arranged opposite to the third slide groove. At the same time, the above-mentioned first support rod, second support rod and third support rod can be a long rod, and the two ends respectively extend into the limiting groove and the slide groove, or they can be two short rods, and one of the short rods corresponds to the slide groove, and the other short rod corresponds to the limiting groove, so as to realize the limitation of the rotation angle of the first baffle 2, the second baffle 3 and the third baffle 4, and avoid the problem of excessive rotation blocking the air outlet 102 and affecting the exhaust efficiency.

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

[0063] Since the first baffle 2 in the present application is closer to the volute tongue 101, the third baffle 4 is closer to the air outlet 102, and the second baffle 3 is located between the first baffle 2 and the second baffle 3, 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 baffle 4 have a larger adjustment range and the first baffle 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.

[0064] In addition, if Figure 4 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, controlling the first adjustment mechanism to fit with the mounting wall 1011, and the second adjustment mechanism to contact with the volute tongue 101; step two, using a noise detection mechanism to monitor the noise at the position of the first adjustment mechanism, and controlling the angle of the first adjustment mechanism relative to the mounting wall 1011 and the distance of the second adjustment mechanism relative to the volute tongue 101 according to noise feedback.

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

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

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

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

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

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

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

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

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

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

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

[0076] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A volute fan, characterized in that: It comprises a volute (1), a first adjustment mechanism, a second adjustment mechanism and a noise detection mechanism; The volute (1) is formed with a volute tongue (101), the noise detection mechanism is arranged at the air outlet (102) of the volute (1), the first adjustment mechanism is arranged on a mounting wall (1011) on the side of the volute tongue (101) facing the air outlet (102), and the first adjustment mechanism extends along a first direction, the two ends of the first adjustment mechanism are respectively matched with the two side walls of the volute (1) in the first direction, and the first adjustment mechanism can rotate relative to the mounting wall (1011), so that the first adjustment mechanism and the mounting wall (1011) are in contact with each other or arranged at an angle; The second adjustment mechanism is consistent with the shape of the volute tongue (101), and the second adjustment mechanism can move in a direction approaching or away from the volute tongue (101).

2. The volute blower according to claim 1, characterized in that: The second adjustment mechanism comprises a second drive assembly (6) and a second adjustment member, wherein the second drive assembly (6) is arranged outside the volute (1), and a telescopic end of the second drive assembly (6) passes through the volute (1) and is connected to the second adjustment member, so that the second adjustment member moves in a direction approaching or away from the volute tongue (101).

3. The volute fan according to claim 2, characterized in that: The second adjusting member comprises a first volute tongue block (7) and a second volute tongue block (8); The number of the second drive components (6) is arranged corresponding to the number of the first volute tongue block (7) and the second volute tongue block (8), and the first volute tongue block (7) and the second volute tongue block (8) are arranged at intervals along the first direction, and the sum of the overall dimensions of the first volute tongue block (7) and the second volute tongue block (8) is a, and the dimension of the volute (1) in the first direction is b, 4. The volute fan according to claim 1, characterized in that: The first adjustment mechanism comprises a first drive assembly (5) and a first adjustment member, the first drive assembly (5) being arranged outside the volute (1), and the output end of the first drive assembly (5) passing through the volute (1) and connected to the first adjustment member, the first adjustment member being rotatable relative to the mounting wall (1011) and being in contact with or arranged at an angle to the mounting wall (1011).

5. The volute fan according to claim 4, characterized in that: The first driving assembly (5) comprises a driving motor and a rotating shaft, wherein the rotating shaft extends along the first direction and is fixedly connected to the first adjusting member, and one end of the rotating shaft is connected to an output end of the driving motor.

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

7. The volute blower according to claim 4, characterized in that: The first adjusting member comprises a first baffle (2), a second baffle (3) and a third baffle (4), and the number of the first driving components (5) corresponds to the number of the first baffle (2), the second baffle (3) and the third baffle (4); The first baffle (2), the second baffle (3) and the third baffle (4) are arranged in sequence from the volute tongue (101) in the direction of the air outlet (102), and the first baffle (2), the second baffle (3) and the third baffle (4) are spaced at the same interval.

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

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

10. A 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, control the first adjustment mechanism to fit the installation wall (1011), and the second adjustment mechanism to contact the volute tongue (101); Step 2: Use a noise detection mechanism to monitor the noise at the position of the first adjustment mechanism, and control the angle of the first adjustment mechanism relative to the installation wall (1011) and the distance of the second adjustment mechanism relative to the volute tongue (101) based on noise feedback.

11. The backflow prevention adjustment method according to claim 10, characterized in that: In step 2, controlling the angle of the first adjustment mechanism relative to the installation wall (1011) and the distance of the second adjustment mechanism relative to the volute tongue (101) according to noise feedback comprises: adjusting the angle of the first adjustment mechanism relative to the installation wall (1011) and the distance of the second adjustment mechanism relative to the volute tongue (101) according to the gear position of the range hood and the noise value detected by the noise detection mechanism; When the range hood is at a low gear, a baffle in the first adjustment mechanism is adjusted according to the noise value detected by the noise detection mechanism, so that the noise value is reduced to within a set threshold; When the range hood is in a strong gear, two baffles in the first adjustment mechanism are adjusted according to the noise value detected by the noise detection mechanism, and the distance between the second adjustment mechanism and the volute tongue (101) is adjusted at the same time, so that the noise value is reduced to within a set threshold value; When the range hood is at the stir-fry gear, all baffles in the first adjustment mechanism are adjusted according to the noise value detected by the noise detection mechanism, and the distance between the second adjustment mechanism and the volute tongue (101) is adjusted at the same time, so that the noise value is reduced to within a set threshold.

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