CN215908087U

CN215908087U - Double-air-inlet centrifugal fan and range hood applying same

Info

Publication number: CN215908087U
Application number: CN202122088987.5U
Authority: CN
Inventors: 易芳文
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-02-25
Anticipated expiration: 2031-08-31

Abstract

The utility model relates to a double air inlet centrifugal fan, comprising: the volute is provided with an air outlet, a first air inlet and a second air inlet, wherein the first air inlet and the second air inlet are respectively positioned at the front side and the rear side; the impeller is arranged in the volute and comprises a middle disc; the motor is arranged outside the volute, and an output shaft of the motor is in transmission connection with the central disc of the impeller so as to drive the impeller to rotate; the two supporting seats are respectively arranged at the first air inlet and the second air inlet which are adjacent to the volute; and the rotating shaft is arranged on the central shaft of the impeller and is fixed relative to the impeller, and the front end and the rear end of the rotating shaft can be respectively and rotatably supported on the two supporting seats. The centrifugal fan solves the problem that the air inlet on one side of the air duct is influenced by the occupied space of the motor, so that air enters and exits from the two sides of the centrifugal fan more uniformly, the structure of the fan is effectively simplified, and the production cost is reduced.

Description

Double-air-inlet centrifugal fan and range hood applying same

Technical Field

The utility model relates to the technical field of centrifugal fans, in particular to a double-air-inlet centrifugal fan and a range hood applying the same.

Background

The centrifugal fan is an important air supply device and is commonly used for products such as a range hood, an air conditioner and the like. Most of centrifugal fans for range hoods in the market at present are single-side air inlet, and the single-side air inlet enables the air inlet of the range hood to suck air unevenly, so that the noise is large, mixed flow is easy to generate, and meanwhile, the effect of large air volume and large pressure can be realized by a motor with enough high power.

In order to overcome the disadvantage of single-side air intake of the centrifugal fan, the centrifugal fan with double-side air intake in the prior art generally comprises a volute, an impeller and a motor, wherein the impeller is arranged in the volute, and the motor is fixed on the wall of the volute through a flange and is arranged in an air inlet at one side. For example, the present invention discloses a centrifugal fan with double air inlets as set forth in "a middle-set double axial-flow centrifugal fan" of the chinese patent application No. CN201910508660.3 (publication No. CN 110131182A). However, the double-air-inlet centrifugal fan in the patent adopts the motor to be arranged in the air inlet at one side of the fan, so that most of space of the air inlet at one side is blocked, and the resistance of the air inlets at two ends is different, so that the air inlet amount is different, the air inlet of the air channel is not uniform, and particularly, the motor is arranged in the volute, occupies the area of the air channel, influences the performance of the air channel and is easy to generate abnormal sound.

In order to solve the problem in the above-mentioned patent, chinese utility model patent that application number is CN201821339417.0 (the grant bulletin number is CN209370102U) discloses "a fan of range hood of two air intakes", it includes the casing, the left and right sides of casing is equipped with left impeller and right impeller respectively, install the motor on the casing, the motor drives left impeller and right impeller rotation simultaneously, the casing includes left casing and right casing, the inboard of left casing and right casing all is equipped with baffle and air outlet, be equipped with the pivot between two baffles, the baffle is run through in the pivot, both ends are respectively in left impeller and right impeller fixed connection about the pivot. The casing includes the surface, is provided with the motor cabinet on the surface of casing, and the motor is installed on the motor cabinet, and the motor passes through drive mechanism and is connected with the pivot drive. This patent is through separating two impellers to and install the motor in the outside of casing, make the air current that flows in the casing can not take place to interfere, reduce the mixed flow, thereby improved the result of use of fan.

However, the centrifugal fan in the above patent still has certain deficiency in the practical use process, firstly, the transmission mechanism for driving the impeller to rotate in the above patent is arranged at the middle position in the casing and connected with the external motor, in order to avoid the interference problem, the transmission mechanism needs to divide the impeller into a left part and a right part, and the casing also needs to divide into a left part and a right part and is separated by the partition plate, and this kind of fan is essentially a combined fan structure that two single-side air intake fans are combined together, and the structure is relatively complex, and the production cost is high. On the other hand, the driving motor in the above patent still has a unidirectional output torque, and when the driving motor is operated, the stress is not uniform, vibration is easy to occur, and a noise problem occurs.

SUMMERY OF THE UTILITY MODEL

The first technical problem to be solved by the utility model is to provide a double-air inlet centrifugal fan which can effectively simplify the fan structure and reduce the production cost aiming at the current situation of the prior art.

The second technical problem to be solved by the utility model is to provide a double-air-inlet centrifugal fan which is stable in the operation process of a motor and is not easy to generate vibration and noise, 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 double-air-inlet 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 double air intake centrifugal fan comprising:

the volute is provided with an air outlet, a first air inlet and a second air inlet, wherein the first air inlet and the second air inlet are respectively positioned at the front side and the rear side;

the impeller is arranged in the volute and comprises a middle disc;

the motor is arranged outside the volute, and an output shaft of the motor is in transmission connection with the central disc of the impeller so as to drive the impeller to rotate;

the two supporting seats are respectively arranged at the first air inlet and the second air inlet which are adjacent to the volute;

and the rotating shaft is arranged on the central shaft of the impeller and is fixed relative to the impeller, and the front end and the rear end of the rotating shaft can be respectively and rotatably supported on the two supporting seats.

In order to connect the movable impeller with the rotating shaft to rotate and ensure the uniformity of air inlet on the front side and the rear side of the centrifugal fan, the impeller is structurally symmetrical relative to the middle disc in a mirror mode.

In order to realize the transmission connection between the motor and the impeller, the middle part of the rotating shaft is connected with the middle disc of the impeller, two ends of the rotating shaft are respectively and rotatably connected to the two supporting seats, and the output shaft of the motor is in transmission connection with at least one end part of the rotating shaft.

In order to realize the connection of the rotating shaft and the supporting seats, the supporting purpose of the rotating shaft is realized, and the rotating shaft is ensured to rotate flexibly, the two supporting seats comprise rotating shaft connecting parts positioned at the middle parts and connecting supporting arms which are arranged at intervals at the periphery of the rotating shaft connecting parts and are distributed radially integrally, bearing mounting positions are arranged on the rotating shaft connecting parts, and bearings used for being connected with the end parts of the rotating shaft are arranged on the bearing mounting positions.

In order to guarantee the air suction effect of the impeller, the impeller further comprises blades and two end plates which are oppositely arranged in the front-back direction, wherein the blades are arranged between the end plates and are sequentially distributed at intervals along the peripheries of the end plates.

In order to fix the supporting seat relative to the volute, air inlet rings are arranged at the first air inlet and the second air inlet of the volute, and the connecting support arms of the supporting seat are connected with the air inlet rings.

In order to simplify the installation process, each supporting seat and the corresponding air inlet ring are designed into a whole.

In order to realize the stable and firm connection of the impeller and the rotating shaft, the impeller comprises a wheel disc, the wheel disc is provided with a connecting hole, the rotating shaft is arranged in the connecting hole in a penetrating mode, and the rotating shaft is locked with the wheel disc through locking pieces arranged on the front side and the rear side of the connecting hole.

Above-mentioned retaining member can adopt various locking device such as lock nut, quick detach hasp, in order to guarantee the firm nature of being connected between impeller and the pivot the middle part of pivot has and is used for the rim plate installation position that the rim plate is connected, the pivot both sides have threaded connection portion around the rim plate installation position, the retaining member is for connecting lock nut on the threaded connection portion.

The technical scheme adopted by the utility model for solving the second technical problem is as follows: the motor is dual output shaft motor, all is equipped with first belt pulley on two output shafts of this dual output shaft motor, the both ends of pivot all are equipped with the second belt pulley, two first belt pulley all is connected with the second belt pulley that corresponds separately through driving belt. The first pulley and the second pulley are preferably V-shaped pulleys, and the transmission belt is preferably a V-shaped belt.

In order to fixedly connect the motor with other components, the motor fixing seat is further included for fixing the motor.

The technical scheme adopted by the utility model for solving the third technical problem is as follows: a range hood applying the double-air inlet centrifugal fan.

Compared with the prior art, the utility model has the advantages that: on the basis of not changing original impeller basic structure, through setting up two bearing, make the impeller can support it on through the pivot ground of rotating, and drive through the motor, this centrifugal fan has not only solved wind channel one side air intake and has been influenced by motor occupation space, make centrifugal fan both sides business turn over wind more even, the effective utilization ratio and the air inlet effect in wind channel have been promoted, moreover, this kind of centrifugal fan has avoided adopting complicated fan mechanism (like double-shell, bilobed wheel and baffle structure) among the prior art, the fan structure has effectively been simplified, the production cost is reduced, the manufacturing efficiency of fan product has been promoted. In the preferred scheme, a motor with double output shafts is adopted to drive the impeller to rotate, so that the torque can be output in two directions, the operation process is stable, and the problems of vibration and noise are not easy to generate. In another preferred scheme, the impeller and the volute component are designed in a mirror-image structure, so that the manufacturing manufacturability is improved, the air inlet uniformity of the two sides of the fan is further ensured, the air flow is smoother, and the quality sound of the fan system is improved.

Drawings

FIG. 1 is a schematic perspective view of an embodiment of the present invention;

FIG. 2 is a partial exploded view of an embodiment of the present invention;

FIG. 3 is a cross-sectional perspective view of an embodiment of the present invention taken along the axis of the impeller (with components such as the motor and drive belt omitted);

FIG. 4 is a schematic perspective view of an impeller according to an embodiment of the present invention;

FIG. 5 is a schematic perspective view of a supporting base according to an embodiment of the present invention;

fig. 6 is a schematic perspective view of a rotating shaft according to an embodiment of the present invention.

Detailed Description

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

Referring to fig. 1 to 6, a dual inlet centrifugal fan includes a volute 10, an impeller 20 and a motor 30, wherein the volute 10 has an air outlet 13 and a first air inlet 11 and a second air inlet 12 respectively located at front and rear sides, the impeller 20 is disposed in the volute 10, and front and rear air inlet ends of the impeller 20 are opposite to the first air inlet 11 and the second air inlet 12 of the volute 10. The motor 30 may be disposed outside the volute 10, and is configured to drive the impeller 20 to rotate, so as to provide negative pressure, so that external air flows through the first air inlet 11 and the second air inlet 12, enters the volute 10 at the same time, and is discharged through the air outlet 13 under the guiding effect of the air duct inside the volute 10.

Referring to fig. 2 and 3, the first air inlet 11 and the second air inlet 12 of the volute 10 are both provided with air inlet rings, so that the flow guiding effect on the air flowing through the first air inlet and the second air inlet can be realized, and the noise problem can be reduced.

Referring to fig. 3, the impeller 20 includes two end plates 21, a middle plate 22, a wheel plate 23, and blades 24, the two end plates 21 are arranged at intervals in the front-rear direction, and the blades 24 are disposed between the two end plates 21 and sequentially distributed at intervals in the circumferential direction of the end plates 21. The outer periphery of the central disc 22 is provided with slots (not shown) for the blades 24 to pass through. The wheel disc 23 is attached to a middle region of the center disc 22 for connection with a rotating shaft 43 (described later) of a driving apparatus.

Referring to fig. 2 and 3, the volute 10 and the impeller 20 of the present embodiment are mirror-symmetrically arranged with respect to the center plate 22, so that the manufacturability is improved, the uniformity of air intake at two sides of the fan is further ensured, the airflow is smoother, and the quality sound of the fan system is improved.

Referring to fig. 1, an electric motor 30, preferably a dual output shaft motor 30, is provided outside the volute 10. The front and rear sides of the dual output shaft motor 30 are respectively provided with output shafts extending forwards and backwards, and the two output shafts of the dual output shaft motor 30 can be connected with the impeller 20 through the transmission assembly 40, so as to drive the impeller 20 to rotate. The motor 30 is also fixedly connected with other components or the volute casing 10 through the motor mounting base 50, and the motor mounting base 50 shown in the embodiment can be connected with other components (such as a fan frame of a range hood) besides the volute casing 10.

The transmission assembly 40 includes a rotating shaft 43 and two supporting seats 41. The two supporting seats 41 are respectively arranged at the first air inlet 11 and the second air inlet 12 of the volute. The middle portion of the rotating shaft 43 has a disc mounting location 431, and the outer diameter of the disc mounting location 431 is larger than that of other region positions so as to form a stepped shaft structure. The wheel disc 23 has a connection hole 230, and the rotation shaft 43 can be inserted into the connection hole 230 and locked with the wheel disc 23 at a wheel disc installation position 431 by locking pieces arranged at the front and rear sides of the connection hole 230. Specifically, the rotating shaft 43 has threaded connection portions 432 at front and rear sides of the wheel disc mounting position 431, and the locking member is a locking nut 44 which can be correspondingly connected to the two threaded connection portions 432 of the rotating shaft 43, so as to firmly fix the rotating shaft 43 and the wheel disc 23. The two ends of the rotating shaft 43 extend out of the first air inlet 11 and the second air inlet 12 of the volute 10 and are respectively and rotatably connected to the two supporting seats 41, see fig. 6.

Referring to fig. 5, each of the two supporting seats 41 includes a shaft connecting portion 411 located in the middle and connecting arms 412 spaced along the periphery of the shaft connecting portion 411 and radially distributed as a whole. In the present embodiment, each support base 41 shows 3 connecting arms 412, and it is contemplated that the number of connecting arms 412 may be 3, 4, 6, or 8. The connecting arm 412 can be connected to the air inlet rings 25 correspondingly disposed at the first air inlet 11 and the second air inlet 12, and preferably, the supporting seat 41 and the corresponding air inlet ring 25 are integrally designed. Specifically, a bearing mounting position 4110 is arranged on the rotating shaft connecting portion 411, a bearing 42 is arranged on the bearing mounting position 4110, the end portion of the rotating shaft 43 can penetrate through and is supported on the bearing 42, and a shaft outlet 4111 for the rotating shaft 43 to penetrate out is correspondingly arranged on the rotating shaft connecting portion 411, so that the supporting effect of the supporting seat 41 on the rotating shaft 43 is achieved, and the rotating shaft 43 is guaranteed to rotate flexibly.

With reference to fig. 1, two output shafts of the dual-output shaft motor 30 are respectively provided with a first belt pulley 45, two ends of the rotating shaft 43 are respectively provided with a second belt pulley 46, and the two first belt pulleys 45 are respectively connected with the respective second belt pulleys 46 through a transmission belt 47. The first pulley 45 and the second pulley 46 are preferably V-shaped pulleys, the transmission belt 47 is preferably a V-shaped belt, and the V-shaped pulleys and the V-shaped belt transmit torque more smoothly and efficiently and have a simple structure.

The embodiment also relates to a range hood, which adopts the double-air-inlet centrifugal fan.

On the basis of not changing the basic structure of the original impeller 20, the motor 30 with the external double output shafts is connected with the front end and the rear end of the rotating shaft 43 transversely penetrating through the impeller 20 to drive the impeller 20 to rotate, so that the problem that the air inlet at one side of the air duct is influenced by the space occupied by the motor 30 is solved, air inlet and air outlet at two sides of the centrifugal fan are more uniform, the effective utilization rate of the air duct is improved, the air inlet effect of the centrifugal fan is enhanced, in addition, the motor 30 is external, the phenomenon that the motor 30 is in direct rigid contact with the impeller 20 to generate resonance abnormal sound is avoided, and a series of defects caused by the fact that the motor 30 is arranged in the inner cavity of the volute 10 are optimized. On the other hand, the centrifugal fan avoids the adoption of a complex fan mechanism (such as a double-shell, a double-impeller 20 and a partition plate structure) in the prior art, effectively simplifies the fan structure, reduces the production cost and improves the manufacturing efficiency of fan products. Moreover, the double-output-shaft motor 30 is adopted to drive the impeller 20 to rotate, so that the torque can be output in two directions, the operation process is stable, and the problems of vibration and noise are not easy to generate. In the preferred scheme, the impeller 20 and the volute 10 are designed in a mirror structure, which not only improves the manufacturing manufacturability, but also further ensures the uniformity of air inlet at two sides of the fan, so that the air flow is smoother, and the quality and sound of the fan system are improved.

As used herein, the term "drivingly connected" means that two elements are directly connected or indirectly connected through a drive mechanism.

Claims

1. A double air intake centrifugal fan comprising:

the volute (10) is provided with an air outlet (13) and a first air inlet (11) and a second air inlet (12) which are respectively positioned at the front side and the rear side;

an impeller (20) disposed within the volute (10) and including a center plate (22);

the motor (30) is arranged outside the volute (10), and an output shaft of the motor (30) is in transmission connection with a central disc of the impeller (20) so as to drive the impeller (20) to rotate;

it is characterized by also comprising:

the two supporting seats (41) are respectively arranged at the positions close to the first air inlet (11) and the second air inlet (12) of the volute (10);

and a rotating shaft (43) which is provided on the central axis of the impeller (20), is fixed to the impeller (20), and has front and rear ends rotatably supported by the two support bases (41).

2. The double intake air centrifugal fan of claim 1, characterized in that: the impeller (20) is mirror symmetrical in structure with respect to the center plate (22).

3. The double intake air centrifugal fan of claim 1, characterized in that: the middle part of the rotating shaft (43) is connected with the middle disc (22) of the impeller (20), two ends of the rotating shaft (43) are respectively and rotatably connected to the two supporting seats (41), and the output shaft of the motor (30) is in transmission connection with at least one end part of the rotating shaft (43).

4. The double intake air centrifugal fan of claim 3, characterized in that: two bearing (41) all include the pivot connecting portion (411) that are located the middle part and follow the periphery interval arrangement of pivot connecting portion (411), and whole be radial distribution's connection support arm (412), be equipped with bearing installation position (4110) on pivot connecting portion (411), be equipped with on bearing installation position (4110) be used for with bearing (42) of the end connection of pivot (43).

5. The double intake air centrifugal fan of claim 4, characterized in that: air inlet rings (25) are arranged at the first air inlet (11) and the second air inlet (12) of the volute (10), and connecting support arms (412) of the supporting seat (41) are connected with the air inlet rings (25).

6. The double intake air centrifugal fan of claim 5, characterized in that: each supporting seat (41) and the corresponding air inlet ring (25) are designed into a whole.

7. The double intake air centrifugal fan of any one of claims 1-6, characterized in that: impeller (20) including with rim plate (23) that well dish (22) are connected, have connecting hole (230) on rim plate (23), pivot (43) wear to establish in connecting hole (230) to through locating the retaining member of connecting hole (230) front and back both sides with rim plate (23) lock.

8. The double intake air centrifugal fan of claim 7, characterized in that: the middle part of pivot (43) has and is used for rim plate installation position (431) that rim plate (23) are connected, pivot (43) have threaded connection portion (432) in both sides around rim plate installation position (431), the retaining member is for connecting lock nut (44) on threaded connection portion (432).

9. The double intake air centrifugal fan of claim 7, characterized in that: impeller (20) still include blade (24) and two end plates (21) of relative setting in the front and back direction, blade (24) are located two between end plate (21), and follow the periphery of end plate (21) interval distribution in proper order.

10. The double intake air centrifugal fan of any one of claims 1-6, characterized in that: motor (30) are dual output shaft motor, all are equipped with first belt pulley (45) on two output shafts of this dual output shaft motor, the both ends of pivot (43) all are equipped with second belt pulley (46), two first belt pulley (45) all are connected with second belt pulley (46) that correspond separately through driving belt (47).

11. A range hood using the double air intake centrifugal fan as claimed in any one of claims 1 to 10.