CN111456946A - Centrifugal fan and oil smoke purification device - Google Patents

Abstract

The invention discloses a centrifugal fan and an oil fume purification device, wherein the centrifugal fan comprises a volute, a motor bracket, an impeller and an outer rotor motor; air inlets are formed in two opposite sides of the volute; the impeller is arranged in the volute and comprises a mounting disc and a plurality of blades arranged along the circumference of the mounting disc; the motor bracket is arranged at one air inlet of the volute; the outer rotor motor comprises a stator and a rotor which is rotatably arranged on the periphery of the stator; the end face of the stator is fixedly connected with the motor support, and the rotor is fixedly connected with the mounting disc. The centrifugal fan can reduce the volume of the centrifugal fan so as to prevent the centrifugal fan from blocking an air duct and further improve the air volume of the centrifugal fan.

Description

Centrifugal fan and oil smoke purification device

Technical Field

The invention relates to the technical field of oil fume purification devices, in particular to a centrifugal fan and an oil fume purification device.

Background

In the related art, a centrifugal fan is generally disposed in the oil smoke purifying device to drive an air flow to adsorb oil smoke by the centrifugal fan. However, in the oil fume purification device in the current market, the rotor and outer rotor motor of the centrifugal fan is usually the traditional rotor and outer rotor motor, and the volume of the traditional rotor and outer rotor motor is large, so that the whole volume of the centrifugal fan is large, the centrifugal fan is easy to block an air duct, airflow in the air duct flows unsmoothly, and further the air volume of the centrifugal fan is small.

Disclosure of Invention

The invention mainly aims to provide a centrifugal fan, which aims to reduce the volume of the centrifugal fan so as to prevent the centrifugal fan from blocking an air duct and further improve the air quantity of the centrifugal fan.

In order to achieve the above object, the present invention provides a centrifugal fan, which includes a volute, a motor bracket, an impeller and an outer rotor motor; air inlets are formed in two opposite sides of the volute; the impeller is arranged in the volute and comprises a mounting disc and a plurality of blades arranged along the circumference of the mounting disc; the motor bracket is arranged at one air inlet of the volute; the outer rotor motor comprises a stator and a rotor which is rotatably arranged on the periphery of the stator; the end face of the stator is fixedly connected with the motor support, and the rotor is fixedly connected with the mounting disc.

Optionally, the centrifugal fan further includes a plurality of vibration absorbing portions disposed between the motor bracket and the end surface of the stator; the centrifugal fan further comprises a plurality of connecting pieces, each connecting piece corresponds to one damping portion, and the connecting pieces enable the end faces of the motor support, the damping portions and the stator to be connected in a penetrating mode.

Optionally, the motor bracket is provided with a first connection hole; each damping part comprises a damping substrate, and the damping substrate is provided with a second connecting hole corresponding to the first connecting hole so that the connecting piece can penetrate through the second connecting hole; the shock absorption part also comprises a shock absorption sleeve corresponding to the shock absorption substrate, the shock absorption sleeve extends into the first connecting hole corresponding to the shock absorption part and is sleeved with the connecting piece in a ring mode.

Optionally, the connecting member includes a nut and a stud protruding from an inner side surface of the nut, and the stud passes through the first connecting hole and the second connecting hole and is connected to an end surface of the stator; each shock absorption portion further comprises a shock absorption ring, and the shock absorption ring is arranged between the nut of the connecting piece corresponding to the shock absorption portion and the motor support to support the nut.

Optionally, the damping sleeve extends out of the first connection hole to the outer side of the motor support, and the damping ring is sleeved at the outer end of the damping sleeve.

Optionally, the damping ring of each damping portion is connected with the damping base of the damping portion through a connecting strip.

Optionally, two adjacent shock absorption parts are connected through a connecting part, so that the shock absorption parts are sequentially connected to form a shock absorption ring which is arranged in an annular shape.

Optionally, an annular boss is convexly arranged on the end surface of the stator facing the motor support; the damping ring is sleeved on the periphery of the annular boss.

Optionally, the plurality of shock absorbing parts and the plurality of connecting parts on the shock absorbing ring are integrally formed.

Optionally, the motor bracket is integrally formed with the volute; or the motor bracket and the volute are manufactured and molded in a split mode, and then the motor bracket is fixedly installed on the volute.

Optionally, the motor bracket includes two opposite mounting bars, two ends of each mounting bar are fixedly connected to the volute, and a middle portion of the mounting bar is fixedly connected to an end surface of the stator.

Optionally, the mounting bar includes a main body portion and mounting portions extending from two ends of the main body portion to connect with the volute; two the main part of mounting bar all is the arc setting, and these two the main part cooperation of mounting bar is the annular, and with the terminal surface of stator corresponds the cooperation.

The invention also provides an oil fume purification device which comprises a case and a centrifugal fan. The case is provided with an air suction opening, an air outlet and an air duct, and the air duct is used for communicating the air suction opening with the air outlet; the centrifugal fan is arranged in the air duct of the case and is suitable for driving air flow to flow from the air suction port to the air exhaust port. The centrifugal fan comprises a volute, a motor bracket, an impeller and an outer rotor motor; air inlets are formed in two opposite sides of the volute; the impeller is arranged in the volute; the motor bracket is arranged at one air inlet of the volute; the outer rotor motor comprises a stator and a rotor which is rotatably arranged on the periphery of the stator; the end face of the stator is fixedly connected with the motor support, and the rotor is fixedly connected with the impeller.

Optionally, the oil fume purification device is a range hood or an integrated stove.

According to the technical scheme, an outer rotor motor is arranged in an impeller of the centrifugal fan, and comprises a stator and a rotor constructed on the outer side of the stator; the rotor is fixedly connected with the mounting disc, the stator is fixedly connected with the motor support at one air inlet of the volute, so that when the centrifugal fan works, the outer rotor motor drives the impeller to rotate through the rotor, and air flow is driven to enter from the air inlet of the volute and blow out from the air outlet of the volute. Because the centrifugal fan adopts the outer rotor motor, the volume of the outer rotor motor can be designed to be smaller, the space occupied by the outer rotor motor can be effectively reduced, and further the whole volume of the centrifugal fan is effectively reduced, so that the centrifugal fan is prevented from blocking an air duct of electrical equipment, and the air quantity of the centrifugal fan is further improved. Moreover, the end face of the stator of the outer rotor motor is fixedly connected with the motor support, so that the area of connection with the motor support can be increased, the motor support can be ensured to stably support the stator, the stability of stator installation is improved, and the stator is not easy to shake.

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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of a lampblack purification device;

FIG. 2 is a schematic view showing the internal structure of the oil fume purification apparatus shown in FIG. 1;

FIG. 3 is an enlarged view taken at A in FIG. 2;

FIG. 4 is an exploded view of the oil fume purification apparatus shown in FIG. 1

FIG. 5 is a schematic structural diagram of a centrifugal fan according to an embodiment of the present invention;

FIG. 6 is an enlarged view at B in FIG. 5;

FIG. 7 is an exploded view of the centrifugal fan of FIG. 5;

FIG. 8 is a schematic structural view of the motor of FIG. 7;

FIG. 9 is a schematic structural view of the shock absorbing part of FIG. 7;

fig. 10 is a schematic structural view of the motor bracket of fig. 7.

The reference numbers illustrate:

the objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. 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 invention.

Embodiments of a centrifugal fan adapted to be mounted on an electrical device to function as a fan device for airflow are provided. As for the electric appliance, the electric appliance may be a lampblack purification device, an air conditioner, a purifier, or the like. In the following embodiments, the oil smoke purification device is mainly used as an example for explanation, and other types of electrical appliances may be appropriately referred to for implementation. For the centrifugal fan, the volume of the centrifugal fan is smaller, and the volume of the air channel occupied by the centrifugal fan can be reduced, so that the air channel is prevented from being blocked by the centrifugal fan, and the air quantity of the centrifugal fan is further improved.

Referring to fig. 5 to 7, in an embodiment of the centrifugal fan 100, the centrifugal fan 100 includes a volute 110, an impeller 130, a motor bracket 120 and an outer rotor motor 140. Wherein, the opposite two sides of the volute 110 are provided with air inlets 111; the motor bracket 120 is installed at one of the air inlets 111 of the scroll casing 110; the impeller 130 is arranged in the volute 110, and the impeller 130 comprises a mounting disc 131 and a plurality of blades 132 arranged along the circumference of the mounting disc 131; the outer rotor motor 140 includes a stator 141 and a rotor 142 (as shown in fig. 8) rotatably disposed on the outer periphery of the stator 141, wherein an end surface of the stator 141 is fixedly connected to the motor bracket 120, and the rotor 142 is fixedly connected to the mounting plate 131.

Specifically, the interior of the volute 110 is a hollow cavity for housing the impeller 130. The opposite two sides of the volute 110 are configured to form an air inlet 111, wherein the air inlet 111 far away from the motor bracket 120 is provided with an air inlet ring 150; one end of the scroll casing 110 is configured to form an air outlet 112, and the air outlet 112 communicates with the air inlet 111 through a hollow cavity of the scroll casing 110. When the centrifugal fan 100 works, the outer rotor motor 140 drives the impeller 130 to rotate, the impeller 130 drives the airflow to enter the hollow cavity of the volute 110 from the air inlets 111 at two sides, and then the airflow is rotated at a high speed along with the impeller 130 and finally thrown out to the air outlet 112 by the impeller 130 to be blown out.

For the impeller 130, after the impeller 130 is disposed in the volute 110, two ends of the impeller 130 respectively correspond to the two air inlets 111 of the volute 110, and the impeller 130 is rotatable relative to the volute 110. The impeller 130 includes a mounting plate 131 and a plurality of blades 132 provided along the circumference of the mounting plate 131, and a wheel cavity of the impeller 130 is formed inside the plurality of blades 132. The mounting disc 131 of the impeller 130 is a disc body with an annular design, and the mounting disc 131 may be located at an end portion of the impeller 130 or at a middle portion of the impeller 130. When the centrifugal fan 100 is in operation, the air flow entering from the two air inlets 111 of the volute 110 directly enters the wheel cavity of the impeller 130 from the two ends of the impeller 130 along the axial direction of the impeller 130, and is then radially thrown out by the rotation of the impeller 130.

For the external rotor motor 140, the rotor 142 of the external rotor motor 140 is sleeved outside the stator 141, and the rotor 142 is rotatable relative to the stator 141. The stator 141 of the external rotor motor 140 is connected to the motor bracket 120 at one of the air inlets 111, so that the external rotor motor 140 is supported and fixed by the motor bracket 120. The rotor 142 of the outer rotor motor 140 is fixedly connected to the mounting plate 131 of the impeller 130, and specifically, the rotor 132 may be connected to the mounting plate 131 located at the end of the impeller 130, or may be connected to the mounting plate 131 located at the middle of the impeller 130. The two can be fixed by screwing or welding. Specifically, a mounting flange 1421 is provided on the outer periphery of the rotor 142 in a protruding manner, and the mounting flange 1421 is fixedly connected to the mounting disk 131 of the impeller 130. When the outer rotor motor 140 is started, the rotor 142 rotates relative to the stator 141, and the rotor 142 drives the impeller 130 to rotate integrally.

Compared with the conventional inner rotor motor 140, the outer rotor motor 140 has higher output torque and output power, and the torque of the outer rotor motor 140 is larger than that of the inner rotor motor 140 at the same rotating speed, so that larger air volume can be output. Therefore, the volume of the outer rotor motor 140 can be designed to be smaller, and the space occupied by the outer rotor motor 140 is also smaller, so that after the outer rotor motor 140 is installed in the volute 110, most of the outer rotor motor 140 can be accommodated inside the impeller 130, the outer rotor motor 140 does not extend outward from the air inlet 111 of the volute 110, or only slightly extends out of a very small portion, and the outer rotor motor 140 shields the wheel cavity of the impeller 130 and the air inlet 111 of the volute 110 relatively less, which is beneficial to increasing the effective air inlet area of the centrifugal fan 100.

Because the volume of the outer rotor motor 140 is smaller, after the centrifugal fan 100 is installed inside the electrical equipment, the outer rotor motor 140 does not exceed the volute 110 in the thickness direction, the front and rear width of the electrical equipment box can be reduced, the outer rotor motor 140 in the centrifugal fan 100 cannot extend out of the volute 110 into the air duct 330 of the electrical equipment, the outer rotor motor 140 can be prevented from blocking the air inlet surface of the air duct 330, airflow can smoothly flow, and the centrifugal fan 100 can obtain larger air volume; moreover, the volume of the embedded module (such as the embedded disinfection cabinet 350) at the front end of the electrical equipment box body can be increased.

In the operation process of the conventional external rotor motor 140, since the rotor 142 deviates from the center of the rotating magnetic field, the air gap between the stator 141 and the rotor 142 is not uniform and unbalanced force and moment are easily generated, when the external rotor motor 140 directly fixed on the volute 110 drives the impeller 130 to rotate, the vibration generated by the external rotor motor 140 is directly transmitted to the volute 110, and vibration noise is generated; during the operation of the centrifugal fan 100, the noise is amplified along with the air duct 330, which results in the operation noise of the centrifugal fan 100 increasing.

In this embodiment, the centrifugal fan 100 employs the outer rotor motor 140, the rotor 142 of the outer rotor motor 140 is connected to the impeller 130, when the outer rotor motor 140 operates, the impeller 130 only interacts with the rotor 142, and the generated vibration noise is not directly transmitted to the scroll casing 110, thereby reducing the operation noise of the centrifugal fan 100. Moreover, when the outer rotor motor 140 operates, the impeller 130 is directly driven to rotate by the rotor 142, so that transmission loss can be reduced, and the work efficiency of the outer rotor motor 140 can be improved.

In addition, when the conventional centrifugal fan 100 is assembled, the outer rotor motor 140 is fixed on the volute 110, and then the outer rotor motor 140 is connected to the impeller 130, so that the dynamic balance of the whole fan system is large due to accumulated manufacturing and installation tolerances, and the vibration of the whole fan system is large. In the present embodiment, when assembling the centrifugal fan 100, the external rotor motor 140 is first disposed in the wheel cavity of the impeller 130, and the rotor 142 of the external rotor motor 140 and the mounting plate 131 of the impeller 130 are connected and fixed as a whole, and after the two are assembled, the whole is adjusted in dynamic balance, and after the dynamic balance is adjusted, the stator 141 of the external rotor motor 140 is fixed to the motor support 120, so that the vibration of the whole machine can be effectively reduced, and the user experience can be improved.

According to the technical scheme of the invention, the outer rotor motor 140 is arranged in the impeller 130 of the centrifugal fan 100, and the outer rotor motor 140 comprises a stator 141 and a rotor 142 constructed outside the stator 141; the rotor 142 is fixedly connected to the impeller 130, and the stator 141 is fixedly connected to the motor bracket 120 at one of the air inlets 111 of the volute 110, so that when the centrifugal fan 100 works, the outer rotor motor 140 drives the impeller 130 to rotate through the rotor 142, and drives the air flow to enter from the air inlet 111 of the volute 110 and blow out from the air outlet 112 thereof. Because the centrifugal fan 100 adopts the outer rotor motor 140, the volume of the outer rotor motor 140 can be designed to be smaller, the space occupied by the centrifugal fan 100 can be effectively reduced, the centrifugal fan 100 is prevented from blocking the air duct 330 of the electrical equipment, and the air quantity of the centrifugal fan 100 is further improved. Furthermore, the end face of the stator 141 of the outer rotor motor 140 is fixedly connected to the motor bracket 120, so that the area of connection with the motor bracket 120 can be increased, the motor bracket 120 can be ensured to stably support the stator 141, and the stability of installation of the stator 141 is improved, so that the stator 141 is not easy to shake.

Referring to fig. 5, 6 and 9, in an embodiment, it is considered that the outer rotor motor 140 generates vibration during operation, and the vibration may be transmitted to the volute 110 through the motor bracket 120, thereby generating large vibration noise. To solve this problem, centrifugal fan 100 may further include a plurality of vibration dampers 210 disposed between motor bracket 120 and an end surface of stator 141; centrifugal fan 100 further includes a plurality of connecting members, each of which corresponds to one of damping portions 210, and the connecting members connect end surfaces of motor bracket 120, damping portions 210, and stator 141 in a penetrating manner.

Specifically, the plurality of vibration dampers 210 between the motor bracket 120 and the end surface of the stator 141 may not only space the end surfaces of the motor bracket 120 and the stator 141 apart from each other so that the two are not in direct contact with each other, thereby reducing the vibration transmitted from the stator 141 of the motor to the motor bracket 120; the elastic deformation of the damping portion 210 can also be used to buffer the vibration transmitted from the stator 141 of the outer rotor motor 140 to the motor bracket 120, thereby effectively enhancing the damping effect. The shock absorption parts 210 are distributed, and the contact area between the shock absorption parts and the end face of the stator 141 is small, so that the external rotor motor 140 can radiate heat outwards, and the heat of the external rotor motor 140 is prevented from being accumulated at the position to generate heat and burn out.

For the plurality of shock absorbing members 210, the plurality of shock absorbing members 210 may be individually manufactured and molded so as to be individually detachable; alternatively, the plurality of damper portions 210 may be integrally connected to each other so as to be integrally attached and detached. Specifically, two adjacent shock absorbing portions 210 are connected by a connecting portion 220, so that the plurality of shock absorbing portions 210 are sequentially connected to form one shock absorbing ring 200 disposed in a ring shape. Wherein, the number of the plurality of shock absorbing parts 210 may be the same as the number of the connecting members, and four shock absorbing parts 210 are taken as an example here; accordingly, the number of the connecting portions 220 is four, and the connecting portions 220 are arranged in an arc shape, so that the plurality of shock absorbing portions 210 are sequentially connected to form the damping ring 200.

For convenience of manufacture, the plurality of shock absorbing parts 210 and the plurality of connecting parts 220 on the shock absorbing ring 200 are optionally integrally formed. During the assembly, only need to assemble damping ring 200 wholly, need not to assemble a plurality of shock attenuation portions 210 alone, effectively improve assembly efficiency. And, a part of the shock absorbing parts 210 is not easily lost during the assembly process. As for the material of the damping ring 200, the damping ring 200 is preferably made of a material with better elasticity, such as rubber, silica gel, etc.

Referring to fig. 7 to 9, based on the above embodiment, in order to enhance the stability of the installation of the damper ring 200, an annular boss 1412 is further protruded on the end surface of the stator 141 of the outer rotor motor 140 facing the motor bracket 120; the damping ring 200 is sleeved on the outer circumference of the annular boss 1412, so that the damping part 210 is not easily movable, and is prevented from falling off from a position between the stator 141 and the motor bracket 120 due to the vibration of the outer rotor motor 140.

It should be noted that the thickness of the shock absorbing part 210 should be greater than the height of the annular boss 1412 protruding from the end face of the stator 141, so as to ensure that the shock absorbing part 210 protrudes from the annular boss 1412, prevent the annular boss 1412 from directly contacting the motor support 120, and further prevent the annular boss 1412 from conducting vibration to the motor support 120.

Referring to fig. 7, 9 and 10, as mentioned above, the connecting member connects the motor bracket 120, the damping portion 210 and the end surface of the stator 141 in a penetrating manner. Therefore, the motor bracket 120 is provided with a first connection hole 122; each of the shock absorbing parts 210 includes a shock absorbing base 211, and the shock absorbing base 211 is provided with a second connecting hole corresponding to the first connecting hole 122 for the connecting member to pass through. Correspondingly, the end surface of the stator 141 is provided with a third connecting hole 1411, the third connecting hole 1411 corresponds to the second connecting hole, and the third connecting hole 1411 is a threaded hole.

Specifically, the connecting piece is a screw and comprises a nut and a stud protruding from the inner side surface of the nut. During assembly, the studs of the connecting member sequentially pass through the first connecting hole 122 and the second connecting hole to be connected to the third connecting hole 1411, so that the motor bracket 120, the damping part 210 and the stator 141 of the outer rotor motor 140 are connected together, and compared with a conventional method in which the three are separated, the operation is greatly reduced, and the assembly efficiency is improved. The connecting piece can be a screw or other structures with connecting functions.

In this case, it is considered that motor holder 120 is connected to stator 141 of external rotor motor 140 via a connection, so that vibrations of external rotor motor 140 may be transmitted from the connection to motor holder 120. In order to reduce the vibration transmitted from the external rotor motor 140 to the motor bracket 120, optionally, the shock absorbing part 210 further includes a shock absorbing sleeve 212 corresponding to the shock absorbing base 211, and the shock absorbing sleeve 212 extends into the first connecting hole 122 corresponding to the shock absorbing part 210 and is sleeved on the connecting member.

That is, the portion of the connection member passing through the motor bracket 120 is wrapped by the damping sleeve 212, the damping sleeve 212 separates the connection member from the inner wall of the first connection hole 122 of the motor bracket 120, and the connection member does not contact the inner wall of the first connection hole 122 of the motor bracket 120, so that the vibration conducted to the connection member by the outer rotor motor 140 is buffered by the damping sleeve 212, which not only reduces the vibration conducted to the motor bracket 120 by the connection member, but also prevents the connection member from rubbing against the inner wall of the first connection hole 122 under the vibration action, thereby preventing the connection member from being worn.

For the damping sleeve 212, the damping sleeve 212 may be separately manufactured and molded to be a damping member that can be separately attached and detached; or may be integrally formed with the shock absorbing base 211 of the shock absorbing part 210. Specifically, the damper base 211 of each damper portion 210 and the corresponding damper sleeve 212 are integrally formed, and the damper sleeve 212 is protruded from the periphery of the second connection hole of the damper base 211 toward the motor bracket 120.

Referring to fig. 7 to 9, in an embodiment, since the nut of the connection member is located at the outer side of the motor bracket 120, if the nut of the connection member directly pushes the outer side surface of the motor bracket 120, the vibration transmitted by the connection member of the outer rotor motor 140 may be transmitted to the motor bracket 120 through the nut of the connection member. In view of this, to solve the problem, each of the damping portions 210 further includes a damping ring 213, and the damping ring 213 is disposed between the nut of the connecting member corresponding to the damping portion 210 and the motor bracket 120 for the nut to abut against. After the assembly, the nut of the connecting member abuts against the damping ring 213, so that the nut of the connecting member and the motor bracket 120 are completely isolated and separated, and the nut and the motor bracket 120 are not in direct contact, thereby effectively reducing the vibration transmitted from the outer rotor motor 140 to the motor bracket 120, and further greatly reducing the vibration of the volute 110.

In consideration of the above, in the assembling process, an operator needs to position the damping ring 213 between the motor bracket 120 and the outer rotor motor 140 by hand, and then the connecting member passes through the damping ring 213 and penetrates the stator 141 of the outer rotor motor 140, which is cumbersome to assemble and not easy to align. Therefore, the damping sleeve 212 may alternatively extend from the first connection hole 122 to the outside of the motor bracket 120, and the damping ring 213 may be sleeved on the outer end of the damping sleeve 212. During assembly, the damping sleeve 212 of the damping portion 210 may be extended out of the first connection hole 122 to the outside of the motor bracket 120, and then the damping ring 213 may be sleeved on the outer end of the damping sleeve 212, and at this time, the damping ring 213 may be hung on the outer end of the damping sleeve 212 similarly, so that the operator does not need to position the damping ring 213 by hand; finally, the connecting member is connected to the stator 141 through the damping sleeve 212.

Further, to prevent the damper ring 213 from being lost, the damper ring 213 of each damper portion 210 and the damper base 211 of the damper portion 210 are connected by a connection bar 214. The connecting strip 214 is flexibly deformable. Before the connecting piece is arranged in a penetrating way, the connecting strip 214 can be bent to enable the damping ring 213 to be sleeved at the outer end of the damping sleeve 212; then, the stud of the connecting member is inserted through the damping sleeve 212 until it is fixedly connected to the third connecting hole 14111 of the stator 141.

After assembly, the nut of the connector is pressed against the damping ring 213. That is to say, in the dismouting in-process, damping ring 213 and shock attenuation portion 210 link together all the time, need not additionally to look for and place the position to avoid damping ring 213 to take place the accident and lose. In addition, because the outer end of the connecting piece (namely the cap body of the connecting piece and the part of the stud close to the cap body) is enclosed and sealed by the damping sleeve 212 and the damping ring 213 of the damping part 210, the connecting piece is not easy to contact with the oil smoke gas in the air duct 330, thereby avoiding oil stain or water stain pollution, being not easy to corrode and effectively prolonging the service life of the connecting piece.

Alternatively, the damper base 211, the damper ring 213, and the connection bar 214 of each damper portion 210 are integrally formed. Equivalently, each damping portion 210 is integrated with the damping base 211, the damping sleeve 212, the damping ring 213 and the connecting bar 214, so that each damping portion 210 integrates a plurality of damping functions, each damping portion 210 can almost reduce the area of the direct contact between the connecting piece and the motor bracket 120 to zero, thereby effectively reducing the vibration transmitted from the outer rotor motor 140 to the motor bracket 120 and further avoiding the large vibration of the volute 110.

Referring to fig. 7 and 10, according to any of the above embodiments, the motor bracket 120 and the volute 110 are integrally formed in a fixed manner in which the motor bracket 120 and the volute 110 are connected. Or, the motor bracket 120 and the volute 110 are manufactured and molded separately, and then the motor bracket 120 is fixedly installed on the volute 110; for example, the motor bracket 120 may be fixed to the scroll casing 110 by a snap structure, or by a screw structure.

As for the structure of the motor bracket 120, there are various shape design manners, which are not limited herein. In this embodiment, the motor bracket 120 includes two oppositely disposed mounting bars 121, two ends of the two mounting bars 121 are fixedly connected to the volute 110, and a middle portion of the mounting bar 121 is fixedly connected to the stator 141 of the external rotor motor 140. Specifically, the two mounting bars 121 are arranged in a long shape, and the two mounting bars 121 are arranged side by side at the air inlet 111 of the volute 110.

In an embodiment, in order to improve the stability of the motor bracket 120 for supporting and fixing the outer rotor motor 140, optionally, the mounting bar 121 includes a body portion 1211 and mounting portions 1212 extending from two ends of the body portion 1211 to connect with the volute 110; the main body portions 1211 of the two mounting bars 121 are both arc-shaped, and the main body portions 1211 of the two mounting bars 121 are fitted in a ring shape to correspond to the end surface of the stator 141.

Compared with the linear arrangement of the main body portions 1211 of the two mounting bars 121, the arc arrangement of the main body portions 1211 of the two mounting bars 121 can effectively increase the supporting area of the mounting bars 121 for supporting the outer rotor motor 140, so that the outer rotor motor 140 can be stably supported, and the stability of the motor bracket 120 for supporting and fixing the outer rotor motor 140 is improved.

Referring to fig. 1 to 3, the present invention further provides an oil smoke purifying apparatus, which includes a case 300 and a centrifugal fan 100; the volute 300 is provided with an air suction port 321, an air exhaust port 311 and an air duct 330, wherein the air duct 330 communicates the air suction port 321 with the air exhaust port 311; the centrifugal fan 100 is installed in the air duct 330 of the volute 300, and is adapted to drive the air flow from the air suction port 321 to the air exhaust port 311. The specific structure of the centrifugal fan 100 refers to the above embodiments, and since the oil fume purification device adopts all technical solutions of all the above embodiments, all beneficial effects brought by the technical solutions of the above embodiments are at least achieved, and are not repeated herein. The oil fume purification device can be a range hood or an integrated stove, and in the following embodiments, the integrated stove is mainly taken as an example for description.

Referring to fig. 2 to 4, in an embodiment, the chassis 300 includes a main body 310 and a machine head 320 configured on the main body 310. Wherein, the main box 310 is provided with an air outlet 311 and an air collecting cavity 312 for installing the centrifugal fan 100; the handpiece 320 is provided with an air suction port 321 communicated with the air discharge port 311. The air duct 330 of the volute 300 includes an air inlet duct 331 communicating the air inlet 321 with the air collecting chamber 312, and an air outlet duct 332 communicating the air collecting chamber 312 with the air outlet 311.

Specifically, the centrifugal fan 100 is installed in the air collecting chamber 312 of the main casing 310, and the rear side of the air collecting chamber 312 is covered by a rear cover plate. The two air inlets 111 on the volute 110 of the centrifugal fan 100 are both communicated with the air inlet duct 331. The outer rotor motor 140 of the centrifugal fan 100 is substantially accommodated in the volute 110, and does not or hardly extend into the air inlet duct 331, so that the air inlet duct 331 is not easily blocked, and the air flow in the air duct 330 is smooth.

A direction changing piece (not shown) may be provided in the air outlet duct 332 to guide the air flow in the air outlet duct 332 to be blown out to the air outlet 311. When the oil smoke purifying device works, oil smoke generated by the cooking stove 340 on the main box body 310 enters from the air suction opening 321 of the head 320, enters the air inlet duct 331 after being filtered by the double-layer oil net, then enters the air collecting cavity 312 of the main box body 310 from the air inlet duct 331, is driven by the centrifugal fan 100 in the air collecting cavity 312 to flow to the air outlet duct 332, and finally is blown out from the air outlet 311.

Optionally, the top surface of the main case 310 is configured with a cooktop 340 for a user to cook on the cooktop 340; the head 320 is constructed at the rear side of the cooktop 340 of the main case 310. A plurality of removable sterilizing cabinets 350 are further disposed inside the main cabinet 310, and a sterilizing assembly for sterilizing dishes, etc. is disposed inside the sterilizing cabinets 350.

Because centrifugal fan 100 has adopted external rotor electric machine 140, this external rotor electric machine's volume can design lessly to effectively reduce the whole space that occupies of centrifugal fan 100, that is to say reduce centrifugal fan 100 and occupy the inner space of quick-witted case 300, thereby the surplus space of quick-witted case 300 is great, and this surplus space can supply the installation of component parts such as sterilizer, need not to limit the volume of sterilizer.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (14)

1. A centrifugal fan, comprising:

the volute is provided with air inlets at two opposite sides;

the motor bracket is arranged at one air inlet of the volute;

the impeller is arranged in the volute and comprises a mounting disc and a plurality of blades arranged along the circumference of the mounting disc; and

the outer rotor motor comprises a stator and a rotor which is rotatably arranged on the periphery of the stator; the end face of the stator is fixedly connected with the motor support, and the rotor is fixedly connected with the mounting disc.

2. The centrifugal fan of claim 1, further comprising a plurality of vibration dampening portions disposed between the motor bracket and the end face of the stator; the centrifugal fan further comprises a plurality of connecting pieces, each connecting piece corresponds to one damping portion, and the connecting pieces enable the end faces of the motor support, the damping portions and the stator to be connected in a penetrating mode.

3. The centrifugal fan of claim 2, wherein the motor bracket is provided with a first connection hole; each damping part comprises a damping substrate, and the damping substrate is provided with a second connecting hole corresponding to the first connecting hole so that the connecting piece can penetrate through the second connecting hole;

the shock absorption part also comprises a shock absorption sleeve corresponding to the shock absorption substrate, the shock absorption sleeve extends into the first connecting hole corresponding to the shock absorption part and is sleeved with the connecting piece in a ring mode.

4. The centrifugal fan as claimed in claim 3, wherein the connecting member comprises a nut and a stud protruding from an inner side surface of the nut, and the stud is connected to the end surface of the stator by passing through the first connecting hole and the second connecting hole; each shock absorption portion further comprises a shock absorption ring, and the shock absorption ring is arranged between the nut of the connecting piece corresponding to the shock absorption portion and the motor support to support the nut.

5. The centrifugal fan as claimed in claim 4, wherein the damping sleeve extends from the first connection hole to an outer side of the motor bracket, and the damping ring is sleeved on an outer end of the damping sleeve.

6. The centrifugal fan according to claim 4, wherein the vibration absorbing base of the vibration absorbing portion is connected with the vibration absorbing ring corresponding thereto by a connection bar.

7. The centrifugal fan according to any one of claims 2 to 6, wherein two adjacent damping portions are connected by a connecting portion, so that the damping portions are sequentially connected to form a damping ring in an annular arrangement.

8. The centrifugal fan as claimed in claim 7, wherein an end surface of the stator facing the motor bracket is convexly provided with an annular boss; the damping ring is sleeved on the periphery of the annular boss.

9. The centrifugal fan according to claim 7, wherein the plurality of damper portions and the plurality of connecting portions on the damper ring are integrally formed.

10. The centrifugal fan according to any one of claims 1 to 6, wherein the motor bracket is integrally formed with the volute; or the motor bracket and the volute are manufactured and molded in a split mode, and then the motor bracket is fixedly installed on the volute.

11. The centrifugal fan according to any one of claims 1 to 6, wherein the motor bracket comprises two oppositely arranged mounting bars, two ends of each mounting bar are fixedly connected with the volute, and the middle part of the mounting bar is fixedly connected with the end surface of the stator.

12. The centrifugal fan as claimed in claim 11, wherein the mounting bar includes a main body portion, and mounting portions extending from both ends of the main body portion to be connected to the scroll; two the main part of mounting bar all is the arc setting, and these two the main part cooperation of mounting bar is the annular, and with the terminal surface of stator corresponds the cooperation.

13. An oil fume purification device, characterized in that, oil fume purification device includes:

the air conditioner comprises a case, a fan and a fan, wherein the case is provided with an air outlet, an air suction opening and an air channel, and the air channel is used for communicating the air suction opening with the air outlet; and

the centrifugal fan according to any one of claims 1 to 12, wherein the centrifugal fan is installed in an air duct of the housing, and is adapted to drive an air flow from the air suction opening to the air discharge opening.

14. The fume purification apparatus according to claim 13, wherein the fume purification apparatus is a range hood or an integrated stove.

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