CN216306331U

CN216306331U - Collector for centrifugal fan, centrifugal fan using collector and range hood

Info

Publication number: CN216306331U
Application number: CN202122532964.9U
Authority: CN
Inventors: 雷改
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2022-04-15
Anticipated expiration: 2031-10-19

Abstract

The utility model relates to a current collector for a centrifugal fan, and the centrifugal fan and a range hood applying the current collector, wherein the current collector comprises: a flow guide ring; the rectifying net comprises a first positioning ring and a plurality of guide strips, wherein the first positioning ring is positioned in the center of the rectifying net, and each guide strip is plate-shaped and is provided with a front side and a rear side; first retainer ring includes retainer plate and the movable ring that arranges in proper order in the axial, the movable ring is connected on the retainer plate with the mode that can relative retainer plate take place to rotate around self axis, along circumference interval arrangement on movable ring and/or the retainer plate, the first end activity restraint of every water conservancy diversion strip is in rather than the first spacing groove that corresponds, second end activity restraint is on the internal periphery of water conservancy diversion circle, the movable ring can act on the preceding side of each water conservancy diversion strip in the rotation process, and the preceding side that drives each water conservancy diversion strip takes place to deflect rather than the back side. The collector can adjust the flowing direction of the airflow, so that the airflow can smoothly enter the impeller, the impact loss of the airflow is reduced, and the aerodynamic noise is reduced.

Description

Collector for centrifugal fan, centrifugal fan using collector and range hood

Technical Field

The utility model relates to the technical field of centrifugal fans, in particular to a current collector for a centrifugal fan, and the centrifugal fan and a range hood applying the current collector.

Background

The centrifugal fan is an important air supply device and is commonly used in products such as a range hood, an air conditioner and the like. In order to improve the air inflow condition, improve the working efficiency of the fan, and reduce the noise, a current collector is usually disposed at the air inlet of the centrifugal fan, and the design of the current collector can directly affect the performance and the operation noise of the fan.

For example, the chinese utility model patent with application number CN201920015837.1 (No. CN209704924U) discloses a flow collector for a centrifugal fan, which comprises a flow guide ring, wherein the flow guide ring comprises a circular fixing ring and a flow guide part, a flow guide net is arranged inside the flow guide part, and the flow guide net comprises a plurality of flow guide strips radially arranged outwards and a fixing ring for connecting the flow guide strips into a whole; the projection of each guide bar on a plane vertical to the central axis is arc-shaped, and the arc of the projection has the same bending direction and keeps the same with the bending direction of the impeller blade of the centrifugal fan. The cross-section of the flow guide strip is an airfoil, and the NACA symmetrical airfoil curve is adopted, so that the airfoil cross-section can reduce the flow separation phenomenon and reduce the flow resistance. The inner side of the flow guide part is provided with the flow guide net, so that the effects of rectification, vortex breaking and oil smoke filtering can be achieved, and the overall performance of the fan system is improved to a certain extent.

However, the current collector in the above patent has a certain disadvantage that the flow guiding net of the current collector is fixedly connected to the flow guiding part, that is, the installation angle of the flow guiding strips of the flow guiding net is fixed, so that under the condition of different flow and speed of air inlet, the impact angle of the air flow entering the impeller blade flow channel to the blade is different after the air flow is guided by the flow guiding net, therefore, the flow guiding strips with the fixed installation angle cannot be adjusted due to the flow guiding angle, and under the condition of different air inlet flow speeds, the air flow is difficult to match with the installation angle of the impeller inlet, so that the air flow cannot smoothly enter the impeller, the air flow impact loss is increased, and the aerodynamic noise is increased.

SUMMERY OF THE UTILITY MODEL

The first technical problem to be solved by the present invention is to provide a collector for a centrifugal fan, which can adjust the flow direction of an air flow, so that the air flow can smoothly enter an impeller, thereby reducing the impact loss of the air flow and reducing the aerodynamic noise.

The second technical problem to be solved by the present invention is to provide a centrifugal fan using the above collector for a centrifugal fan, aiming at the current situation of the prior art.

The third technical problem to be solved by the utility model is to provide a range hood applying the centrifugal fan, aiming at the current situation of the prior art.

The technical scheme adopted by the utility model for solving the first technical problem is as follows: a collector for a centrifugal fan, comprising:

a flow guide ring;

the rectifying net is arranged in the flow guide ring and comprises a first positioning ring positioned in the center and a plurality of flow guide strips distributed at intervals along the circumferential direction of the flow guide ring, the first end of each flow guide strip is connected with the outer periphery of the first positioning ring, the second end of each flow guide strip is connected with the inner periphery of the flow guide ring, and each flow guide strip is plate-shaped and is provided with a front side facing the incoming flow direction and a rear side facing away from the incoming flow direction;

first retainer ring includes retainer plate and the movable ring that arranges in proper order in the axial, the movable ring is connected around self axis emergence pivoted mode with the relatively retainer plate on the retainer plate, the movable ring or/and along circumference interval arrangement on the retainer plate, every the first end activity restraint of water conservancy diversion strip is in rather than corresponding in the first spacing groove, the activity restraint of second end is in on the internal periphery of water conservancy diversion circle, the movable ring can act on each at the rotation process the preceding side of water conservancy diversion strip to drive each the preceding side of water conservancy diversion strip takes place to deflect rather than the back side.

In order to form the first limiting groove and simplify the structural consideration of the first positioning ring, the wall surface of the movable ring facing the fixed ring is provided with a first notch into which the front side edge of the guide strip extends, the wall surface of the fixed ring facing the movable ring is provided with a second notch into which the rear side edge of the guide strip extends, and the first notch and the second notch are oppositely arranged, so that the first limiting groove is formed together.

In order to enable the guide strips to flexibly deflect under the driving of the movable ring and avoid the problem that the connection part between the guide strips and the guide rings interferes the rotation of the guide strips, second limiting grooves are arranged on the inner periphery of the guide rings at intervals along the circumferential direction, and the second ends of the guide strips are movably constrained in the second limiting grooves corresponding to the second ends of the guide strips.

In order to further ensure the whole firmness of the rectification net, the rectification net further comprises at least one second positioning ring, third limiting grooves are arranged on the second positioning ring at intervals along the circumferential direction, and each diversion strip penetrates through and is movably constrained in the corresponding third limiting groove. The third limiting groove on the second positioning ring can be used for the guide strips to move in the third limiting groove, so that the influence on the flexible deflection of the guide strips is avoided.

In order to drive the movable ring to rotate, the movable ring further comprises a driving motor arranged on the fixed ring, and an output shaft of the driving motor is connected with the movable ring so as to drive the movable ring to rotate around the axis of the movable ring.

In order to automatically adjust the deflection angle of the flow guide strips in a matching manner according to the flow velocity of air flow flowing through the flow collector, the device further comprises a controller and an air speed sensor arranged on the first positioning ring, and the air speed sensor and the driving motor are in electric signal connection with the controller, so that the controller can control the driving motor to drive the flow guide strips to deflect to a set position according to a received air speed signal of the air speed sensor.

In order to increase the air inlet area of the deflector ring, the deflector ring is provided with a central axis, a first direction and a second direction which are opposite are formed along the central axis of the deflector ring, the oil smoke flow path is along the second direction, and the rectifying net is integrally in a truncated cone shape and gradually reduces in caliber along the first direction.

In order to better accord with the prerotation motion rule of the air flow at the air inlet of the centrifugal fan and reduce the impact of the air flow on the rectifying net, the flow guide ring is provided with a central axis, the projection of the molded line of each flow guide strip on the plane vertical to the central axis of the flow guide ring is a logarithmic spiral line, and the rotating directions of the logarithmic spiral lines corresponding to the flow guide strips are the same.

In order to reduce the flow resistance of the airflow passing through the guide strips, the cross section of each guide strip is of a double convex wing type or a flat convex wing type.

The technical scheme adopted by the utility model for solving the second technical problem is as follows: a centrifugal fan applying the current collector for the centrifugal fan.

The technical scheme adopted by the utility model for solving the third technical problem is as follows: a range hood using the centrifugal fan.

Compared with the prior art, the utility model has the advantages that: the front side edge of each flow guide strip of the rectifying net can be driven to deflect relative to the rear side edge of the flow guide strip by rotating the movable ring, and the inclination angle of each flow guide strip is changed, so that under different air inlet speed, the inclination angle of the flow guide strip can be changed by the rotating ring, the speed direction of air flow entering the impeller after the flow guide of the rectifying net is matched with the inlet installation angle of the impeller blade, the air flow can smoothly enter the impeller, the impact loss of the air flow is reduced, and the pneumatic noise problem at the position is effectively improved.

Drawings

Fig. 1 is a schematic perspective view of a current collector according to an embodiment of the present invention;

fig. 2 is a schematic view of a back-inverted current collector in accordance with an embodiment of the present invention;

fig. 3 is a cross-sectional view of a current collector of an embodiment of the present invention taken along an axial direction thereof;

fig. 4 is a schematic perspective view of a current collector without a flow guide strip according to an embodiment of the present invention;

fig. 5 is a schematic perspective view of a deflector ring according to an embodiment of the present invention;

FIG. 6 is a perspective view of a second retaining ring according to an embodiment of the present invention;

FIG. 7 is a schematic perspective view of a first positioning ring according to an embodiment of the present invention;

fig. 8 is a schematic perspective view of a first positioning ring according to an embodiment of the present invention (the movable ring is rotated clockwise by a certain angle relative to the fixed ring);

fig. 9 is a schematic perspective view of a first positioning ring according to an embodiment of the present invention (the movable ring is rotated counterclockwise by a certain angle relative to the fixed ring);

fig. 10 is a perspective cross-sectional view of a gib according to an embodiment of the utility model.

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to fig. 1 to 10, a collector for a centrifugal fan includes a flow guiding ring 10 and a rectifying net 20 disposed in the flow guiding ring 10, wherein the flow guiding ring 10 includes an outer ring and a flow guiding portion, the outer ring is used for being connected with a volute, and the flow guiding portion is used for guiding an air flow into an impeller. The structure and the operation principle of the deflector ring 10 are the prior art, and are not described herein.

Referring to fig. 1 and 2, the rectifying net 20 of the present embodiment is connected in the flow guiding portion of the flow guiding ring 10, and includes a first positioning ring 21, a second positioning ring 22, and a plurality of flow guiding strips 23. The guide strips 23 are distributed at intervals along the circumferential direction of the guide ring 10, wherein the first end of each guide strip 23 is connected with the outer peripheral edge of the first positioning ring 21, and the second end is connected with the inner peripheral edge of the guide part of the guide ring 10.

Referring to fig. 7 to 9, the first retainer ring 21 is located at a central position of the rectification net 20, and includes a stationary ring 212 and a movable ring 211 arranged in order in an axial direction, wherein the movable ring 211 is located at a front side of the stationary ring 212. The movable ring 211 and/or the fixed ring 212 are provided with first limiting grooves 210 at intervals along the circumferential direction, and the first end of each guide strip 23 is movably constrained in the corresponding first limiting groove 210. Second limiting grooves 11 are arranged on the inner periphery of the flow guide ring 10 at intervals along the circumferential direction, and the second end of each flow guide strip 23 is movably constrained in the corresponding second limiting groove 11 on the flow guide ring 10.

The movable ring 211 is connected to the fixed ring 212 so as to be rotatable about its axis with respect to the fixed ring 212. The movable ring 211 can act on the front side 231 of each of the plurality of air guide strips 23 during the rotation process, and drive the front side 231 of each of the plurality of air guide strips 23 to deflect relative to the rear side 232 thereof. Fig. 7 to 9 respectively show the state that the movable ring rotates to different angles in a clockwise direction (or a counterclockwise direction) relative to the stationary ring.

Referring to fig. 10, in the present embodiment, each of the guide strips 23 has a plate shape, and has a front side 231 facing the incoming flow direction and a rear side 232 facing away from the incoming flow direction. The wall of the movable ring 211 facing the stationary ring 212 has a first notch 2110 into which the front side 231 of the air guide strip 23 extends, and the wall of the stationary ring 212 facing the movable ring 211 has a second notch 2120 into which the rear side 232 of the air guide strip 23 extends, wherein the first notch 2110 and the second notch 2120 are disposed opposite to each other, thereby forming the first position-limiting groove 210, as shown in fig. 7. More specifically, in order to enable the movable ring 211 to drive the air guide bar 23 to deflect, the width of the second notch 2120 is substantially equal to the thickness of the rear side 232 of the air guide bar 23, and the width of the first notch 2110 is slightly larger than the thickness of the front side 231 of the air guide bar 23, so as to allow the air guide bar 23 to rotate around the rear side 232 thereof.

Referring to fig. 5 and 6, the second positioning ring 22 is provided with third limiting grooves 220 at intervals along the circumferential direction, and each flow guide strip 23 penetrates through and is movably constrained in the corresponding third limiting groove 220. The second positioning rings 22 of this embodiment are preferably two and spaced apart in the radial direction of the guide ring 10.

In this embodiment, the third position-limiting groove 220 on the second positioning ring 22 and the second position-limiting groove 11 on the deflector ring 10 are both similar to the first position-limiting groove 210, so that the deflector bar 23 can flexibly deflect under the driving of the movable ring 211, thereby avoiding the interference problem.

Referring to fig. 2 and 3, the fixing ring 212 is provided with a driving motor 30, and the driving motor 30 is connected to the fixing ring 212 through a fixing bracket 34. The output shaft of the drive motor 30 is disposed coaxially with the axis of the fixed ring 212. The inner peripheral wall of the movable ring 211 is provided with a connecting block 31, the connecting block 31 is provided with a connecting hole 310 for inserting the output shaft of the driving motor 30 therein, the inner peripheral wall of the connecting hole 310 is in fit connection with the outer peripheral wall of the output shaft of the driving motor 30 through a key slot, and more specifically, the inner peripheral wall of the connecting hole 310 is provided with a positioning slot 33, and the output shaft of the driving motor 30 is provided with a positioning lug 32 which extends radially outwards and is clamped into the positioning slot. When the driving motor 30 acts, the movable ring 211 can be driven to rotate around the axis thereof by the connecting block 31.

Referring to fig. 1, the first positioning ring is provided with an air velocity sensor 40, and the air velocity sensor 40 and the driving motor 30 are electrically connected to a controller (not shown) of the centrifugal fan, wherein the controller may be provided on the collector or on other components of the centrifugal fan except the collector. In the operation process of the centrifugal fan, the controller can control the driving motor 30 to act according to the received wind speed signal of the wind speed sensor 40 to drive each flow guide strip 23 to deflect to a set position, so that the purpose of automatically performing matched adjustment on the deflection angle of each flow guide strip 23 according to the flow speed of the airflow flowing through the flow collector is achieved.

Referring to fig. 1, the deflector ring 10 has a central axis O, and a first direction a and a second direction B opposite to each other are formed along the central axis O of the deflector ring 10, wherein the lampblack flow path is along the second direction B. The rectifying net 20 of the present embodiment is generally in a truncated cone shape, and the aperture gradually decreases along the first direction a, thereby increasing the air intake area and reducing the air intake resistance.

In order to better conform to the prerotation motion law of the air flow at the air inlet of the centrifugal fan and reduce the impact of the air flow on the rectifier network 20, the projections of the molded lines of the guide strips 23 on the plane perpendicular to the central axis O of the guide ring 10 are logarithmic spirals, and the rotating directions of the logarithmic spirals corresponding to the guide strips 23 are the same. Further, in order to reduce the flow resistance of the air flow passing through the guide strips 23, the cross section of the guide strips 23 is a double convex wing type or a flat convex wing type.

The current collector of this embodiment can drive the preceding side of each water conservancy diversion strip of rectifier network and take place to deflect rather than its back side through rotating the movable ring, changes the inclination of each water conservancy diversion strip, like this, under different air inlet air velocity, the inclination of accessible change water conservancy diversion strip for speed direction that air current got into in the impeller after the rectifier network water conservancy diversion matches with impeller blade's import erection angle, and then in messenger's air current can smoothly get into the impeller, reduces the shock loss of air current, effectively improves the pneumatic noise problem here.

The embodiment also relates to a centrifugal fan applying the collector and a range hood applying the centrifugal fan.

On the basis of the above embodiments, other embodiments can be obtained by replacing and improving the related technical features. For example, the first limiting groove 210 may be formed only on the fixed ring 212 or only on the movable ring 211. For another example, the movable restraining fit between the movable ring 211 and the fixed ring 212 may adopt various existing limiting structures, such as a sliding fit of an annular groove and a projection, which can realize the axial limitation and the circumferential rotation of the two.

Claims

1. A collector for a centrifugal fan, comprising:

a flow guiding ring (10);

the rectifying net (20) is arranged in the flow guide ring (10) and comprises a first positioning ring (21) positioned in the center and a plurality of flow guide strips (23) distributed at intervals along the circumferential direction of the flow guide ring (10), the first end of each flow guide strip (23) is connected with the outer circumferential edge of the first positioning ring (21), the second end of each flow guide strip is connected with the inner circumferential edge of the flow guide ring (10), each flow guide strip (23) is plate-shaped and is provided with a front side edge (231) facing the incoming flow direction and a rear side edge (232) facing away from the incoming flow direction;

the method is characterized in that: the first positioning ring (21) comprises a fixed ring (212) and a movable ring (211) which are sequentially arranged in the axial direction, the movable ring (211) is connected to the fixed ring (212) in a manner of rotating around the axis of the movable ring relative to the fixed ring (212), first limiting grooves (210) are arranged on the movable ring (211) or/and the fixed ring (212) at intervals along the circumferential direction, the first end of each guide strip (23) is movably constrained in the corresponding first limiting groove (210), the second end of each guide strip is movably constrained on the inner periphery of the guide ring (10), and the movable ring (211) can act on the front side edges (231) of the guide strips (23) in the rotating process and drive the front side edges (231) of the guide strips (23) to deflect relative to the rear side edges (232) of the guide strips (23).

2. The collector for a centrifugal fan according to claim 1, wherein: the wall surface of the movable ring (211) facing the fixed ring (212) is provided with a first notch (2110) for the front side edge (231) of the guide strip (23) to extend into, the wall surface of the fixed ring (212) facing the movable ring (211) is provided with a second notch (2120) for the rear side edge (232) of the guide strip (23) to extend into, and the first notch (2110) and the second notch (2120) are oppositely arranged, so that the first limiting groove (210) is formed together.

3. The collector for a centrifugal fan according to claim 1, wherein: second limiting grooves (11) are arranged on the inner periphery of the flow guide ring (10) at intervals along the circumferential direction, and second ends of the flow guide strips (23) are movably constrained in the corresponding second limiting grooves (11).

4. The collector for a centrifugal fan according to claim 1, wherein: the water-guiding device is characterized by further comprising at least one second positioning ring (22), third limiting grooves (220) are arranged on the second positioning ring (22) at intervals along the circumferential direction, and each water-guiding strip (23) penetrates through and is movably constrained in the corresponding third limiting groove (220).

5. The collector for the centrifugal fan according to any one of claims 1 to 4, wherein: the device is characterized by further comprising a driving motor (30) arranged on the fixed ring (212), wherein an output shaft of the driving motor (30) is connected with the movable ring (211), so that the movable ring (211) is driven to rotate around the axis of the movable ring (211).

6. The collector for a centrifugal fan according to claim 5, wherein: the wind speed sensor (40) and the driving motor (30) are connected with the controller through electric signals, so that the controller can control the driving motor (30) to drive the diversion strips (23) to deflect to a set position according to received wind speed signals of the wind speed sensor (40).

7. The collector for a centrifugal fan according to any one of claims 1 to 4, wherein: the deflector (10) has a central axis (O), a first direction (A) and a second direction (B) are formed along the central axis (O) of the deflector (10) in opposite directions, the oil smoke flow path is along the second direction (B), and the rectifier net (20) is in a truncated cone shape as a whole and gradually reduces in aperture along the first direction (A).

8. The collector for the centrifugal fan according to any one of claims 1 to 4, wherein: the guide ring (10) is provided with a central axis (O), the projection of the molded line of each guide strip (23) on a plane perpendicular to the central axis (O) of the guide ring (10) is a logarithmic spiral, and the rotating directions of the logarithmic spirals corresponding to the guide strips (23) are the same.

9. The collector for the centrifugal fan according to any one of claims 1 to 4, wherein: the cross section of the flow guide strip (23) is of a double convex wing type or a plane convex wing type.

10. A centrifugal fan using the collector for a centrifugal fan according to any one of claims 1 to 9.

11. A range hood using the centrifugal fan as claimed in claim 10.