CN215521401U

CN215521401U - Vibration reduction connecting device for centrifugal fan and centrifugal fan applying same

Info

Publication number: CN215521401U
Application number: CN202120454422.1U
Authority: CN
Inventors: 时璐璐
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2021-03-02
Filing date: 2021-03-02
Publication date: 2022-01-14
Anticipated expiration: 2031-03-02

Abstract

The utility model relates to a vibration damping connecting device for a centrifugal fan and the centrifugal fan using the same, which is used for connecting a volute and a motor of the centrifugal fan, and comprises: the vibration damping pad is fixedly arranged relative to the motor, is columnar as a whole, and is hollow in the axial direction to form a connecting hole; the connecting rod is arranged in the connecting hole of the vibration damping pad in a penetrating mode, the first end of the connecting rod abuts against the first end portion of the vibration damping pad, and the second end of the connecting rod penetrates out of the second end portion of the vibration damping pad and is used for being connected with the volute; and the spring is sleeved on the connecting rod and is arranged between the first end part of the vibration damping pad and the first end of the connecting rod or arranged on the second end part of the vibration damping pad to abut against the volute. The spring of cooperation at the tip of damping pad not only can stretch out and draw back in the axial, can also swing and produce certain deformation in radial direction, can bear the skew that comes from the tangential like this, absorbs the vibration that produces in the tangential, effectively improves the damping effect.

Description

Vibration reduction connecting device for centrifugal fan and centrifugal fan applying same

Technical Field

The utility model relates to the technical field of centrifugal fans, in particular to a vibration reduction connecting device for a centrifugal fan and the centrifugal fan applying the vibration reduction connecting device.

Background

In the working process of the range hood, the fan system can generate large vibration. And the range hood spare part is the sheet metal component mostly, and in the vibration transfer path, if its vibration can not attenuate well, then the fan frame will shake greatly, influences user's impression.

Therefore, the chinese patent application with the application number CN201611168211.1 (publication number CN106762792A) discloses a damping gasket and a centrifugal fan using the same, wherein the damping gasket includes an annular substrate, a first sealing vertical edge and a second sealing vertical edge are respectively formed on the inner side and the outer side of the substrate, the first sealing vertical edge inclines to the outer side and the second sealing vertical edge inclines to the inner side by a certain angle, at least two fixing portions are arranged on the circumferential direction of the substrate, and the damping gasket further includes a stiffness adjusting pad detachably connected with the fixing portions. The damping sealing gasket can realize adjustable rigidity through the matching of the fixing part and the rigidity adjusting gasket, meets the rigidity requirements of different working conditions on the damping sealing gasket, and can solve the problems of aging, serious compression deformation and rigidity increase of the gasket body after long-term use.

However, the damping gasket in the above patent has a certain disadvantage that the body of the stiffness adjustment pad of the damping gasket is hollow cylindrical, and the damping adjustment function is realized only by the plurality of convex blocks at the two axial ends of the stiffness adjustment pad, and when two components to be connected (such as the motor and the volute of the centrifugal fan) are connected, a tangential offset caused by manufacturing or installation errors usually exists, and a certain tangential force and tangential vibration are generated.

SUMMERY OF THE UTILITY MODEL

The first technical problem to be solved by the utility model is to provide a vibration reduction connecting device for a centrifugal fan, which can effectively absorb tangential vibration, aiming at the current situation of the prior art.

The second technical problem to be solved by the present invention is to provide a centrifugal fan using the above vibration damping connection device, in view of 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 vibration damping connection device for a centrifugal fan for connecting a volute of the centrifugal fan and a motor, comprising:

the vibration damping pad is fixedly arranged relative to the motor, is in a column shape as a whole, is hollow in the axial direction and is provided with a connecting hole, and is provided with a first end part and a second end part in the axial direction;

the connecting rod is arranged in the connecting hole of the vibration damping pad in a penetrating mode, the first end of the connecting rod abuts against the first end portion of the vibration damping pad, and the second end of the connecting rod penetrates through the second end portion of the vibration damping pad to be connected with the volute; and

and the spring is sleeved on the connecting rod and is arranged between the first end part of the vibration damping pad and the first end of the connecting rod or arranged on the second end part of the vibration damping pad so as to be abutted against the volute.

In order to make the fixation of spring more firm, avoid taking place great skew, cause the influence to the stability of damping process, the spring includes first spring, the first end of damping pad have with the first annular constant head tank of the coaxial setting of connecting hole of damping pad, the one end of first spring is spacing be in first annular constant head tank in, the other end with the first section of connecting rod offsets.

In order to better absorb tangential vibration generated in the working process, the part between the first annular positioning groove and the connecting hole forms the inner edge of the first annular positioning groove, the part, located outside the first annular positioning groove, of the first end part of the vibration damping pad forms the outer edge of the first annular positioning groove, and the height of the inner edge of the first annular positioning groove is lower than that of the outer edge of the first annular positioning groove. Because the inner edge of the first annular positioning groove of the vibration damping pad is lower than the outer edge height, the first spring has larger swing amplitude in the radial direction, so that the tangential vibration generated in the working process can be effectively absorbed, and the vibration damping effect is improved.

In order to further improve the vibration damping effect, the spring further comprises a second spring, a second annular positioning groove is formed in the second end portion of the vibration damping pad, one end of the second spring is limited in the second annular positioning groove, and the other end of the second spring is used for abutting against the volute.

In order to ensure the vibration damping effect of the vibration damping connecting device in the axial direction, the part between the second annular positioning groove and the connecting hole forms the inner edge of the second annular positioning groove, the part, located outside the second annular positioning groove, of the second end portion of the vibration damping pad forms the outer edge of the second annular positioning groove, and the height of the inner edge of the second annular positioning groove is basically consistent with that of the outer edge of the second annular positioning groove.

In order to meet the rigidity requirement of different working conditions on the vibration damping connecting device, the rigidity of the second spring is different from that of the first spring.

In order to fix the vibration damping pad and the motor, an annular clamping groove for fixing the motor is formed in the peripheral wall of the vibration damping pad.

In order to simplify the connecting structure between the connecting rod and the volute, the connecting rod is a screw rod. The second end of the screw is threaded for attachment to the volute. It is conceivable that the connecting rod and the motor fixing plate may be connected by a snap connection or the like.

The technical scheme adopted by the utility model for solving the second technical problem is as follows: the centrifugal fan comprises a volute and a motor arranged in the volute, wherein the volute is provided with a motor fixing plate, a radial convex flange is formed on a body of the motor, and the vibration reduction connecting device is arranged between the flange and the motor fixing plate.

In order to ensure that the connection between the motor and the volute is firmer, the flange of the motor is arranged along the periphery of the motor body to be annular, and the vibration reduction connecting devices are provided with at least two groups and are arranged at intervals along the circumferential direction of the flange of the motor.

Compared with the prior art, the utility model has the advantages that: the cooperation not only can stretch out and draw back in the axial at the spring of the tip of damping pad, can also swing and produce certain deformation on radial direction, can bear the skew that comes from the tangential like this, absorbs the vibration that produces in the tangential, therefore, when damping connecting device through spring, damping pad and connecting rod cooperation formation connects spiral case and motor, can absorb the vibration that produces in axial and tangential simultaneously, effectively improves the damping effect.

Drawings

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

FIG. 2 is an exploded view of FIG. 1 with the volute and other components omitted;

FIG. 3 is an axial cross-sectional view of the vibration damping attachment of an embodiment of the present invention in assembled condition with a flange of an electric machine;

fig. 4 is a perspective cross-sectional view of a vibration damping pad 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.

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. 1-4, a vibration damping connection for a centrifugal fan is disclosed, which is connected between a volute 40 and a motor 44 of the centrifugal fan. Specifically, the volute 40 of the centrifugal fan is provided with a motor fixing plate 43, the body of the motor 44 is provided with a flange 440 protruding radially outwards, and the vibration damping connecting device can be connected between the motor fixing plate 43 and the flange 440, so that the connection between the volute 40 and the motor 44 is realized, and the purpose of damping the vibration transmission between the volute 40 and the motor 44 is achieved. The damping connection device includes a damping pad 10, a connection rod 20, and springs, and the springs of the present embodiment include a first spring 31 and a second spring 32.

Referring to fig. 4, the damping pad 10 has a cylindrical shape as a whole and is axially hollow to form a connection hole 100. The damping pad 10 has a first end and a second end in the axial direction. The damping pad 10 of the present embodiment is fixedly disposed relative to the flange 440 of the motor 44, specifically, the outer peripheral wall of the damping pad 10 has the ring-shaped slot 13, correspondingly, the flange 440 of the motor 44 preferably adopts a flat plate structure, the outer peripheral edge of the flange 440 of the motor 44 has a notch groove, and the notch groove is used as a mounting hole 441, and the size of the mounting hole 441 is adapted to the size of the ring-shaped slot 13. The inner circumferential edge of the assembly hole 441 can be clamped into the annular clamping groove 13 of the damping pad 10, so that the axial limiting of the motor 44 and the damping pad 10 is realized.

The first end of the vibration damping pad 10 has a first annular positioning groove 11, the second end of the vibration damping pad 10 has a second annular positioning groove 12, and the first annular positioning groove 11 and the second annular positioning groove 12 are both arranged coaxially with the connecting hole 100 of the vibration damping pad 10. Specifically, the portion between the first annular positioning groove 11 and the connecting hole 100 constitutes an inner edge of the first annular positioning groove 11, and the portion of the first end portion of the vibration damping pad 10 located outside the first annular positioning groove 11 constitutes an outer edge of the first annular positioning groove 11. Wherein, the height of the inner edge of the first annular positioning groove is lower than that of the outer edge of the first annular positioning groove 11. The portion between the second annular retaining groove 12 and the attachment hole 100 forms an inner edge of the second annular retaining groove 12, and the portion of the damping pad 10 at the second end outside the second annular retaining groove 12 forms an outer edge of the second annular retaining groove 12. Wherein, the height of the inner edge of the second annular positioning groove is consistent with the height of the outer edge of the second annular positioning groove 12.

Referring to fig. 2 and 3, the connecting rod 20 is inserted into the connecting hole 100 of the damping pad 10. Wherein the length of the connecting rod 20 is greater than the axial length of the damping pad 10. The connecting rod 20 of this embodiment is preferably a threaded rod, and a first end of the threaded rod is abutted against a first end of the damping pad 10 through a gasket 21 sleeved thereon. The second end of screw rod has the screw thread, can set up the screw hole on the motor fixed plate, and from this, the second end of screw rod is worn out the second end of damping pad 10 after, can be connected with the screw hole on the motor fixed plate.

With continued reference to fig. 2 and 3, the first spring 31 is sleeved on the connecting rod 20 and abuts between the first end of the damping pad 10 and the first end of the connecting rod 20. Specifically, one end of the first spring 31 is limited in the first annular positioning groove 11, and the other end of the first spring abuts against the gasket 21 sleeved on the screw rod.

With continued reference to fig. 2 and 3, the second spring 32 is also sleeved on the connecting rod 20 and abuts between the second end of the damping pad 10 and the motor fixing plate. Specifically, one end of the second spring 32 is limited in the second annular positioning groove 12, and the other end abuts against the periphery of the threaded hole of the motor fixing plate.

The rigidity of the second spring 32 is different from that of the first spring 31, so that the rigidity requirement of different working conditions on the vibration damping connecting device can be met, and the vibration damping effect is further improved. After the assembly is completed, the compression amount of the first spring 31 and the second spring 32 is preferably 1 to 2mm, and more preferably 2 mm.

Referring to fig. 1-3, the present embodiment further relates to a centrifugal fan, which includes a volute 40 and a motor 44 disposed in the volute 40, the volute 40 includes an annular wall 41 and two side plates 42, the two side plates 42 are respectively disposed on two sides of the annular wall 41, one of the side plates 42 has a through hole 420 for allowing the tail of the motor 44 to pass through, and a motor fixing plate 43 is further disposed at the position of the through hole 420 of the side plate 42. The motor fixing plate 43 of the present embodiment is preferably a bar-shaped bracket transversely disposed at the position of the through hole 420 of the side plate 42, wherein two bar-shaped brackets are disposed side by side. The motor 44 is located between and connected to the two bar brackets. An impeller 45 is connected to a rotating shaft of the motor 44. Specifically, a radially outwardly protruding flange 440 is formed on the body of the motor 44, and the vibration damping connection device of the present embodiment is provided between the flange 440 of the motor 44 and the motor fixing plate 43 of the volute 40. More specifically, the flange 440 of the motor 44 is arranged along the outer circumference of the body of the motor 44 to have a ring shape, and in the present embodiment, four sets of vibration damping connection means are provided and are spaced apart in the circumferential direction of the flange 440 of the motor 44, wherein each of the bar brackets is connected to the flange 440 of the motor 44 by two sets of vibration damping connection means.

Claims

1. A vibration damping connection for a centrifugal fan for connecting a volute (40) of the centrifugal fan to a motor (44), the vibration damping connection comprising:

the damping pad (10) is fixedly arranged relative to the motor (44), the whole damping pad is columnar, a connecting hole (100) is formed in the axial hollow mode, and the damping pad (10) is provided with a first end portion and a second end portion in the axial direction;

it is characterized by also comprising:

the connecting rod (20) is arranged in the connecting hole (100) of the vibration damping pad (10) in a penetrating mode, the first end of the connecting rod (20) abuts against the first end portion of the vibration damping pad (10), and the second end of the connecting rod (20) penetrates out of the second end portion of the vibration damping pad (10) and is used for being connected with the volute (40); and

and the spring is sleeved on the connecting rod (20) and is arranged between the first end part of the vibration damping pad (10) and the first end of the connecting rod (20) or arranged on the second end part of the vibration damping pad (10) to abut against the volute (40).

2. Vibration-damping connection for centrifugal fans according to claim 1, characterised in that: the spring includes first spring (31), the first end of damping pad (10) have with first annular constant head tank (11) of connecting hole (100) coaxial setting of damping pad (10), the one end of first spring (31) is spacing be in first annular constant head tank (11) in, the other end with the first section of connecting rod offsets.

3. The vibration reducing coupling device for a centrifugal fan according to claim 2, wherein: the part between first annular positioning groove (11) and connecting hole (100) constitutes the interior edge of first annular positioning groove (11), the part that lies in on the first end of damping pad (10) outside first annular positioning groove (11) constitutes the outer edge of first annular positioning groove (11), the height on the interior edge of first annular positioning groove is less than the height on the outer edge of first annular positioning groove (11).

4. A vibration damping connecting device for a centrifugal fan according to claim 2 or 3, characterized in that: the spring further comprises a second spring (32), a second annular positioning groove (12) is formed in the second end portion of the damping pad (10), one end of the second spring (32) is limited in the second annular positioning groove (12), and the other end of the second spring is used for abutting against the volute (40).

5. Vibration-damping connection for centrifugal fans according to claim 4, characterized in that: the part between the second annular positioning groove (12) and the connecting hole (100) forms the inner edge of the second annular positioning groove (12), the part, located outside the second annular positioning groove (12), on the second end of the vibration damping pad (10) forms the outer edge of the second annular positioning groove (12), and the height of the inner edge of the second annular positioning groove is basically consistent with that of the outer edge of the second annular positioning groove (12).

6. Vibration-damping connection for centrifugal fans according to claim 4, characterized in that: the second spring (32) has a different stiffness than the first spring (31).

7. Vibration-damping connection for centrifugal fans according to claim 1, characterised in that: and the peripheral wall of the vibration damping pad (10) is provided with an annular clamping groove (13) for fixing the motor (44).

8. Vibration-damping connection for centrifugal fans according to claim 1, characterised in that: the connecting rod (20) is a screw rod.

9. A centrifugal fan applying the vibration damping connection device according to any one of claims 1 to 8, comprising a volute (40) and a motor (44) arranged in the volute (40), wherein the volute (40) is provided with a motor fixing plate (43), and a body of the motor (44) is formed with a radially outward protruding flange (440), characterized in that: the vibration damping connecting device is arranged between the flange (440) and the motor fixing plate (43).

10. The centrifugal fan of claim 9, wherein: the flange (440) of the motor (44) is arranged along the periphery of the motor (44) body to form a ring shape, and the vibration reduction connecting device is provided with at least two groups and is arranged at intervals along the circumferential direction of the flange (440) of the motor (44).