CN215762423U

CN215762423U - Impeller mechanism and centrifugal fan

Info

Publication number: CN215762423U
Application number: CN202122326339.9U
Authority: CN
Inventors: 任富佳; 吴童; 陈建卫; 周海昕; 余国成; 郑桐福
Original assignee: Hangzhou Robam Appliances Co Ltd
Current assignee: Hangzhou Robam Appliances Co Ltd
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2022-02-08
Anticipated expiration: 2031-09-24

Abstract

The utility model provides an impeller mechanism and a centrifugal fan, relates to the technical field of kitchen electrical equipment, and aims to solve the technical problem that the installation process is complex and tedious between guide vanes of the impeller mechanism and vanes of a main impeller to a certain extent. The impeller mechanism provided by the utility model is used for a centrifugal fan in a range hood and comprises a main impeller and an auxiliary impeller, wherein the main impeller is sleeved outside the auxiliary impeller; the main impeller comprises a first mounting component, the auxiliary impeller comprises a second mounting component, a first matching portion is formed on the first mounting component, a second matching portion is formed on the second mounting component, and the first matching portion is matched with the second matching portion so that the auxiliary impeller can move along with the main impeller.

Description

Impeller mechanism and centrifugal fan

Technical Field

The utility model relates to the technical field of kitchen electrical equipment, in particular to an impeller mechanism and a centrifugal fan.

Background

The centrifugal fan is a driven fluid machine which increases the pressure of gas and discharges the gas by means of input mechanical energy.

In the existing centrifugal fan, the guide vane and the main vane are usually arranged on the same end cover, and the process of installing the guide vane on the original impeller again is more complicated because the process of installing the multi-wing centrifugal fan is complex.

Therefore, it is desirable to provide an impeller mechanism and a centrifugal fan to solve the problems of the prior art to some extent.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an impeller mechanism and a centrifugal fan, and aims to solve the technical problem that the installation process is complex and tedious between a guide vane of the impeller mechanism and a vane of a main impeller to a certain extent.

The utility model provides an impeller mechanism for a centrifugal fan in a range hood, which comprises a main impeller and an auxiliary impeller, wherein the main impeller is sleeved outside the auxiliary impeller; the main impeller comprises a first mounting component, the auxiliary impeller comprises a second mounting component, a first matching part is formed on the first mounting component, a second matching part is formed on the second mounting component, and the first matching part is matched with the second matching part so that the auxiliary impeller can move along with the main impeller.

The main impeller further comprises main blades and a third mounting component, and the auxiliary impeller further comprises guide blades and a fourth mounting component; the main blade is disposed between the first mounting member and the third mounting member in a first direction, and the guide blade is disposed between the second mounting member and the fourth mounting member in the first direction; the third mounting component is provided with a first connecting hole, the fourth mounting component is provided with a second connecting hole at a position corresponding to the first connecting hole, and a first connecting piece is arranged in the first connecting hole and the second connecting hole so as to connect the main impeller and the auxiliary impeller.

Specifically, the number of the main blades is equal to that of the guide blades; the main blades extend along the first direction and are arranged at equal intervals along the circumferential direction of the first mounting component, and the guide blades extend along the first direction and are arranged at equal intervals along the circumferential direction of the second mounting component; the circle center of the main impeller and the circle center of the auxiliary impeller are the same point, and the guide vanes are located in the range enclosed by the two adjacent main vanes and the circle centers.

Furthermore, the guide vanes are all of an airfoil structure, and one surface of each guide vane is a first suction surface; the cross sections of the main blades are all arc-shaped, and one surface of each main blade, which is convex, is a second suction surface; the first suction surface is disposed toward the second suction surface.

Furthermore, an included angle theta between a plane on one side of the guide vane, which is far away from the first suction surface, and the radial direction of the second mounting component is 0-30 degrees; the cross-sectional area of the guide vane along the first direction is increased and then decreased.

Furthermore, the height of the guide vane in the first direction is H, the chord length of the minimum section is L, the inflection point of the guide vane is located between the distances from the second mounting member 1/3H to 1/2H, and the chord length of the section of the guide vane at the inflection point is 2L.

The first matching parts are arranged at intervals along the circumferential direction of the first mounting component; the second matching parts are arranged along the circumferential direction of the second mounting component at intervals and are in one-to-one correspondence with the first matching parts.

Specifically, the first connecting hole is arc-shaped, and the size of the first matching part is not smaller than that of the second matching part; the second matching part can be matched with the first matching part at different positions of the first matching part so as to change the relative position between the guide vane and the main vane.

Further, the impeller mechanism provided by the utility model further comprises a fixing ring, wherein the fixing ring is attached to the first mounting component and the second mounting component; a first limiting hole and a second limiting hole are formed in the fixing ring, a first aligning hole is formed in the position, corresponding to the first limiting hole, of the first mounting component, and a second aligning hole is formed in the position, corresponding to the second limiting hole, of the second mounting component; the first limiting hole and the first aligning hole are internally provided with a second connecting piece, and the second limiting hole and the second aligning hole are internally provided with a third connecting piece, so that the fixing ring can be connected with the main impeller and the auxiliary impeller.

Compared with the prior art, the impeller mechanism provided by the utility model has the following advantages:

the impeller mechanism provided by the utility model is used for a centrifugal fan in a range hood and comprises a main impeller and an auxiliary impeller, wherein the main impeller is sleeved outside the auxiliary impeller; the main impeller comprises a first mounting component, the auxiliary impeller comprises a second mounting component, a first matching portion is formed on the first mounting component, a second matching portion is formed on the second mounting component, and the first matching portion is matched with the second matching portion so that the auxiliary impeller can move along with the main impeller.

From this analysis can know, through add the auxiliary impeller on the inner ring of main impeller, make main impeller cover establish the outside at the auxiliary impeller to make main impeller and auxiliary impeller be connected through first cooperation portion and second cooperation portion, on the one hand can make the auxiliary impeller follow the rotation of main impeller, realize the water conservancy diversion function to gas, on the other hand, can reduce the installation degree of difficulty to a certain extent.

In addition, the utility model also provides a centrifugal fan which comprises the impeller mechanism.

The centrifugal fan adopting the impeller mechanism can inhibit the separation condition of air flow on the main blades to a certain extent, so that the power of the impeller mechanism is reduced, and the energy consumption of the whole centrifugal fan is further reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic overall structural view of an impeller mechanism provided in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a main impeller of an impeller mechanism provided in an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a secondary impeller of the impeller mechanism provided in an embodiment of the present invention;

FIG. 4 is a partial schematic view of the positional relationship between the main vanes and the guide vanes in the impeller mechanism provided by an embodiment of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

FIG. 6 is a partial schematic view of a guide vane in an impeller mechanism provided in accordance with an embodiment of the present invention;

FIG. 7 is a schematic view of the flow of gas in the guide vanes in the impeller mechanism provided by the present invention;

FIG. 8 is a schematic view of the separation suppressing and guiding case without the guide vanes;

fig. 9 is a schematic view of the separation suppression and flow guiding of the guide vane.

In the figure: 1-a main impeller; 101-a first mounting member; 1011-a first mating portion; 1012-first alignment hole; 102-a main blade; 1021-a second suction surface; 103-a third mounting member; 1031-first connection hole; 1032-a boss; 2-an auxiliary impeller; 201-a second mounting member; 2011-second mating portion; 2012-a second alignment hole; 202-guide vanes; 2021-first suction side; 2022-inflection point; 203-a fourth mounting member; 2031 — a second connection hole; 3-fixing the ring; 301-a first limit hole; 302-a second limit hole; 4-a first connector; 5-a second connector; 6-a third connector;

s1 — first direction; s2 — direction of rotation.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually placed in when used, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

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

For ease of description, spatial relationship terms such as "above … …," "upper," "below … …," and "lower" may be used herein to describe one element's relationship to another element as illustrated in the figures. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.

The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. The singular forms also are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" specify the presence of stated features, quantities, operations, elements, components, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and/or combinations thereof.

Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, may be expected. Thus, the examples described herein are not limited to the particular shapes shown in the drawings, but include changes in shape that occur during manufacturing.

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. Further, while the examples described herein have a variety of configurations, other configurations are possible, as will be apparent after understanding the disclosure of the present application. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.

Fig. 1 is a schematic overall structural view of an impeller mechanism provided in an embodiment of the present invention; FIG. 2 is a schematic structural diagram of a main impeller of an impeller mechanism provided in an embodiment of the present invention; fig. 3 is a schematic structural diagram of an auxiliary impeller in the impeller mechanism provided in the embodiment of the present invention.

As shown in fig. 1-3, the present invention provides an impeller mechanism for a centrifugal fan in a range hood, which includes a main impeller 1 and an auxiliary impeller 2, wherein the main impeller 1 is sleeved on the radial outer side of the auxiliary impeller 2; the main impeller 1 comprises a first mounting member 101, the auxiliary impeller 2 comprises a second mounting member 201, a first matching part 1011 is formed on the first mounting member 101, a second matching part 2011 is formed on the second mounting member 201, and the first matching part 1011 and the second matching part 2011 are matched so that the auxiliary impeller 2 can move along with the main impeller 1.

according to the impeller mechanism provided by the utility model, the main impeller 1 and the auxiliary impeller 2 are of a split structure, the auxiliary impeller 2 is additionally arranged on the inner ring of the main impeller 1, the main impeller 1 is sleeved on the radial outer side of the auxiliary impeller 2, and the main impeller 1 is connected with the auxiliary impeller 2 through the first matching part 1011 and the second matching part 2011, so that on one hand, the auxiliary impeller 2 can rotate along with the main impeller 1 to realize a gas guide function, and on the other hand, the installation difficulty can be reduced to a certain extent.

Preferably, as shown in fig. 2 and fig. 3, the first fitting part 1011 and the second fitting part 2011 in the present application are both ratchet structures, the ratchet structure of the first mounting member 101 is concave in the radial direction, and the ratchet structure on the second mounting member 201 is convex in the radial direction. Further preferably, the central angle of adjacent ratchet teeth in this application is 1 °. During installation, the second matching part 2011 is inserted into the first matching part 1011, and the auxiliary impeller 2 and the main impeller 1 can be quickly and fixedly connected through the meshing between the first matching part 1011 and the second matching part 2011, so that the structure is simple and the installation is convenient.

The number of the ratchets corresponding to the first matching part 1011 is 2-3 times that of the ratchets corresponding to the second matching part 2011, so that the meshing position of the second matching part 2011 and the first matching part 1011 can be adjusted, and the adjustment of the position relation between the guide vane 202 and the main vane 102 of the auxiliary impeller 2 is realized to adapt to different flow guiding requirements.

It should be added that, in the present application, the ratchet structure is adopted for the first engaging portion 1011 and the second engaging portion 2011, which is only one preferred embodiment, and the problem that the auxiliary impeller 2 moves relative to the main impeller 1 during the rotation process, so that the flow guiding effect is affected can be avoided. The first matching part 1011 and the second matching part 2011 can also adopt other tooth-shaped meshes or directly realize the quick connection between the main impeller 1 and the auxiliary impeller 2 through the matching of the buckle clamping grooves.

As shown in fig. 1 to 3, the main impeller 1 further includes a main blade 102 and a third mounting member 103, and the sub-impeller 2 further includes a guide blade 202 and a fourth mounting member 203; the main blade 102 is disposed between the first mounting member 101 and the third mounting member 103 in the first direction S1, and the guide blade 202 is disposed between the second mounting member 201 and the fourth mounting member 203 in the first direction S1; the third mounting member 103 is formed with a first connection hole 1031, the fourth mounting member 203 is formed with a second connection hole 2031 at a position corresponding to the first connection hole 1031, and a first connection member 4 is provided in the first connection hole 1031 and the second connection hole 2031 to connect the main impeller 1 and the sub-impeller 2.

In the present application, the second mounting member 201 and the fourth mounting member 203 of the secondary impeller 2 are both annular end cover structures, and the guide vane 202 extends along the first direction S1 and is disposed between the second mounting member 201 and the fourth mounting member 203 to form a secondary impeller structure.

The first mounting member 101 of the main impeller 1 is an end cover structure having a ring shape, the third mounting member 103 is a disk-like structure having a boss 1032 formed at the center thereof, and the main blade 102 extends in the first direction S1 and is disposed between the first mounting member 101 and the third mounting member 103.

The main impeller 1 and the auxiliary impeller 2 are both of an annular structure, when the impeller mechanism rotates, airflow enters the impeller mechanism along the axial direction of the impeller mechanism, and the airflow can be converted from axial flow to radial flow through the guiding effect of the auxiliary impeller 2 and the main impeller 1 on the airflow.

Since the boss 1032 is formed at the middle of the third mounting member 103 of the main impeller 1 in the present application, the air flow flowing to the guide vane 202 can be made more uniform.

Preferably, in this application, a first connection hole 1031 is formed on the third mounting member 103, a second connection hole 2031 is formed on the fourth mounting member 203, and the first connection hole 1031 and the second connection hole 2031 are correspondingly disposed and connected by the first connector 4. The coupling strength of the main impeller 1 and the sub-impeller 2 can be further improved by the provision of the first coupling hole 1031 and the second coupling hole 2031. First connecting piece 4 in this application is the bolt, can prescribe a limit to main impeller 1 and sub-impeller 2' S circumference through the meshing of first cooperation portion 1011 and second cooperation portion 2011, passes first connecting hole 1031 and second connecting hole 2031 through first connecting piece 4, can avoid sub-impeller 2 to produce the removal on first direction S1 relative main impeller 1.

Further preferably, in the present application, the first connection holes 1031 and the second connection holes 2031 are both multiple, the multiple first connection holes 1031 are uniformly distributed on the first mounting member 101, and the multiple second connection holes 2031 are uniformly distributed on the second mounting member 201 and correspond to the first connection holes 1031.

As shown in fig. 2, in the present application, the number of ratchet teeth of the first engagement portion 1011 is greater than that of the second engagement portion 2011, and therefore, the second engagement portion 2011 can engage with the first engagement portion 1011 at different positions of the first engagement portion 1011. That is, the position of the sub-impeller 2 relative to the main impeller 1 in the present application can be changed by the first fitting portion 1011 and the second fitting portion 2011.

Because need first connecting hole 1031 and second connecting hole 2031 further strengthen main impeller 1 and sub-impeller 2's joint strength in this application, consequently, be the arc hole through making first connecting hole 1031, can avoid adjusting behind second cooperation portion 2011 and the meshing position of first cooperation portion 1011, first connecting hole 1031 and the unable problem of counterpointing of second connecting hole 2031, can enough guarantee the relative main impeller 1's of sub-impeller 2 position change, also can guarantee the joint strength between main impeller 1 and the sub-impeller 2.

It should be added here that the first direction S1 in the present application is the extending direction of the main blade 102 and the guide vane 202, i.e., the height direction of the main impeller 1 and the sub-impeller 2.

Fig. 4 is a partial schematic view of the positional relationship between main blades and guide blades in an impeller mechanism according to an embodiment of the present invention.

As shown in fig. 1 to 4, the number of the main blades 102 is the same as that of the guide vanes 202, and the number of the main blades 102 is the same as that of the guide vanes 202; the plurality of main blades 102 extend in the first direction S1 and are arranged at equal intervals in the circumferential direction of the first mounting member 101, and the plurality of guide blades 202 extend in the first direction S1 and are arranged at equal intervals in the circumferential direction of the second mounting member 201; the circle center of the main impeller 1 and the circle center of the auxiliary impeller 2 are the same point, and the guide vane 202 is located in the range enclosed by the two adjacent main vanes 102 and the circle centers.

The main impeller 1 in this application and the cross section of auxiliary impeller 2 are the ring shape, because main blade 102 is unanimous with guide vane 202's quantity, and main blade 102 sets up along main impeller 1's circumference equidistant, guide vane 202 sets up along auxiliary impeller 2's circumference equidistant, consequently, the centre of a circle through making main impeller 1 and auxiliary impeller 2's centre of a circle is located the same point, the meshing of rethread first cooperation portion 1011 and second cooperation portion 2011, can make all have a guide vane 202 to carry out the water conservancy diversion to gas between per two adjacent main blade 102, make main blade 102's atress more even on the one hand, on the other hand, make gas flow more even.

FIG. 5 is an enlarged view of a portion of FIG. 4 at A; FIG. 6 is a partial schematic view of a guide vane in an impeller mechanism provided in accordance with an embodiment of the present invention; fig. 7 is a schematic view of the flow of gas in the guide vanes in the impeller mechanism provided by the present invention.

Specifically, as shown in fig. 5 to 7, each of the plurality of guide vanes 202 is of an airfoil structure, and one surface of each guide vane 202 is a first suction surface 2021; the cross sections of the main blades 102 are all arc-shaped, and one convex surface of each main blade 102 is a second suction surface 1021; the first suction side 2021 is disposed toward the second suction side 1021.

Preferably, the guide vane 202 in the present application is an airfoil structure, and the airfoil structure can reduce wind resistance, so as to reduce flow channel resistance generated by the guide vane 202. The first suction surface 2021 of the guide vane 202 is disposed toward the second suction surface 1021 of the main vane 102, so that the guide vane 202 generates a lift force under the action of the airflow, and the guide vane 202 can obtain a moment in the rotation direction S2, thereby reducing the power of the overall impeller mechanism and reducing the energy consumption of the centrifugal fan.

Further, as shown in fig. 6 and fig. 7, an included angle θ between a plane of a side of the guide vane 202 facing away from the first suction surface 2021 and a radial direction of the second mounting member 201 is 0 ° to 30 °; the cross-sectional area of the guide vane 202 in the first direction S1 increases first and then decreases.

As shown in fig. 8, after the airflow enters the centrifugal fan, the distribution of the separation vortex is not uniform in the first direction S1 of the main blade 102, and if the guide vanes 202 having the same cross-sectional area are used, the non-uniformity of the gas flow cannot be effectively reduced, and the uniform impact effect on the separation vortex of the main blade 102 is achieved. Therefore, guide vane 202 in this application adopts the airfoil structure, and guide vane 202 is along the first direction S1 on the cross sectional area be the mode of setting that reduces after increase to can improve the homogeneity of guide vane 202 wake to main blade 102 separation region impact, and then the reinforcing suppresses the effect of air current separation, promote fan efficiency.

FIG. 8 is a schematic view of the separation suppressing and guiding case without the guide vanes; fig. 9 is a schematic view of the separation suppression and flow guiding of the guide vane.

As shown in fig. 6, the dimension of the guide vane 202 in the first direction S1 is H, the chord length of the smallest cross section is L, the inflection point 2022 of the guide vane 202 is located between 1/3H and 1/2H away from the second mounting member 201, and the chord length of the cross section of the guide vane 202 at the inflection point 2022 is 2L.

As shown in fig. 6, the inflection point 2022 of the guide vane 202 in the present application is located at 1/3H away from the second mounting member 201, so that the airflow can be deflected from the large cross section to the small cross section as shown in fig. 7, and as can be seen from fig. 8 and fig. 9, by providing the guide vane 202 in the present application, the uniformity of the impact of the wake of the guide vane 202 on the separated airflow of the main vane 102 can be improved, the separation of the airflow can be more effectively suppressed, and the fan efficiency can be improved.

It should be noted that the arrows in fig. 7 to 9 in the present application point to the gas flow direction.

Specifically, as shown in fig. 1 to 3, the first fitting portion 1011 is plural, and the plural first fitting portions 1011 are arranged at intervals along the circumferential direction of the first mounting member 101; the second fitting portions 2011 are disposed along the circumferential direction of the second mounting member 201 at intervals, and are disposed in one-to-one correspondence with the first fitting portions 1011.

Preferably, first cooperation portion 1011 and second cooperation portion 2011 in this application are a plurality of, and a plurality of first cooperation portion 1011 and second cooperation portion 2011 one-to-one sets up, can further avoid the rotatory in-process of sub-impeller 2 following main impeller 1 through a plurality of first cooperation portions 1011 and the second cooperation portion 2011 that set up, produce the problem of drunkenness relatively main impeller 1, make main impeller 1 and sub-impeller 2's connection and rotation more stable.

Further, as shown in fig. 1, the impeller mechanism provided by the present invention further includes a fixing ring 3, wherein the fixing ring 3 is attached to the first mounting member 101 and the second mounting member 201; a first limiting hole 301 and a second limiting hole 302 are formed on the fixing ring 3, a first alignment hole 1012 is formed at the position of the first mounting member 101 corresponding to the first limiting hole 301, and a second alignment hole 2012 is formed at the position of the second mounting member 201 corresponding to the second limiting hole 302; third connecting pieces 6 are arranged in the first limiting hole 301 and the first aligning hole 1012, and third connecting pieces 6 are arranged in the second limiting hole 302 and the second aligning hole 2012, so that the connecting strength between the main impeller 1 and the auxiliary impeller 2 is enhanced through the fixing ring 3.

The fixing ring 3 in the present application can cover the gap between the first mounting member 101 and the second mounting member 201, and the connection strength between the main impeller 1 and the sub-impeller 2 can be further enhanced by the fixing ring 3 by the first aligning hole 1012 formed in the first mounting member 101 being fitted to the first limit hole 301 in the fixing ring 3 and the second aligning hole 2012 formed in the second mounting member 201 being fitted to the second limit hole 302 in the fixing ring 3.

Because the auxiliary impeller 2 in this application needs can change the relative position with main impeller 1 according to different demands, consequently, the spacing hole 302 of second in this application is the same with first connecting hole 1031, is the arc hole to can adapt to the position adjustment of auxiliary impeller 2.

It should be added here that the second connecting member 5 and the third connecting member 6 in this application are both bolts.

By adopting the centrifugal fan of the impeller mechanism provided by the application, the separation condition of the airflow on the main blades 102 can be inhibited to a certain extent, so that the power of the impeller mechanism is reduced, and the energy consumption of the whole centrifugal fan is further reduced.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. An impeller mechanism is used for a centrifugal fan in a range hood and is characterized by comprising a main impeller and an auxiliary impeller, wherein the main impeller is sleeved outside the auxiliary impeller;

the main impeller comprises a first mounting component, the auxiliary impeller comprises a second mounting component, a first matching part is formed on the first mounting component, a second matching part is formed on the second mounting component, and the first matching part is matched with the second matching part so that the auxiliary impeller can move along with the main impeller.

2. The impeller mechanism of claim 1, wherein the primary impeller further comprises primary blades and a third mounting member, and the secondary impeller further comprises guide blades and a fourth mounting member;

the main blade is disposed between the first mounting member and the third mounting member in a first direction, and the guide blade is disposed between the second mounting member and the fourth mounting member in the first direction;

the third mounting component is provided with a first connecting hole, the fourth mounting component is provided with a second connecting hole at a position corresponding to the first connecting hole, and a first connecting piece is arranged in the first connecting hole and the second connecting hole so as to connect the main impeller and the auxiliary impeller.

3. The impeller mechanism of claim 2, wherein the number of the main blades and the number of the guide blades are the same;

the main blades extend along the first direction and are arranged at equal intervals along the circumferential direction of the first mounting component, and the guide blades extend along the first direction and are arranged at equal intervals along the circumferential direction of the second mounting component;

the circle center of the main impeller and the circle center of the auxiliary impeller are the same point, and the guide vanes are located in the range enclosed by the two adjacent main vanes and the circle centers.

4. The impeller mechanism of claim 3, wherein a plurality of said guide vanes are each of an airfoil configuration, one face of said guide vanes being a first suction surface;

the cross sections of the main blades are all arc-shaped, and one surface of each main blade, which is convex, is a second suction surface;

the first suction surface is disposed facing the second suction surface.

5. The impeller mechanism of claim 4, wherein the angle θ between the plane of the side of the guide vane facing away from the first suction surface and the radial direction of the second mounting member is 0 ° to 30 °;

the cross-sectional area of the guide vane along the first direction is increased and then decreased.

6. The impeller mechanism of claim 5, wherein the guide vane has a height H in the first direction and a chord length of a smallest cross section L, wherein an inflection point of the guide vane is located between 1/3H-1/2H away from the second mounting member, and wherein the chord length of the cross section of the guide vane at the inflection point is 2L.

7. The impeller mechanism according to claim 2, wherein said first fitting portion is plural, and plural said first fitting portions are provided at intervals in a circumferential direction of said first mounting member;

the second matching parts are arranged along the circumferential direction of the second mounting component at intervals and are in one-to-one correspondence with the first matching parts.

8. The impeller mechanism according to claim 2, wherein said first connection hole is arc-shaped, and a size of said first fitting portion is not smaller than a size of said second fitting portion;

the second matching part can be matched with the first matching part at different positions of the first matching part so as to change the relative position between the guide vane and the main vane.

9. The impeller mechanism of claim 1, further comprising a retaining ring that engages the first mounting member and the second mounting member;

a first limiting hole and a second limiting hole are formed in the fixing ring, a first aligning hole is formed in the position, corresponding to the first limiting hole, of the first mounting component, and a second aligning hole is formed in the position, corresponding to the second limiting hole, of the second mounting component;

the first limiting hole and the first aligning hole are internally provided with a second connecting piece, and the second limiting hole and the second aligning hole are internally provided with a third connecting piece, so that the fixing ring can be connected with the main impeller and the auxiliary impeller.

10. A centrifugal fan comprising an impeller mechanism according to any one of claims 1 to 9.