CN211377793U

CN211377793U - Vibration reduction structure of motor of range hood and range hood comprising vibration reduction structure

Info

Publication number: CN211377793U
Application number: CN201921917277.5U
Authority: CN
Inventors: 孙斌; 郭兰明
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2019-11-07
Filing date: 2019-11-07
Publication date: 2020-08-28
Anticipated expiration: 2029-11-07

Abstract

The utility model relates to a vibration reduction structure of a motor of a range hood and a range hood comprising the same, wherein the vibration reduction structure comprises a bracket and is arranged on a volute of the range hood; the pressing plate is arranged side by side with the bracket, a space is formed between the pressing plate and the bracket, and the pressing plate and the bracket are connected through a connecting piece; the motor comprises a shell penetrating through the pressure plate and a flange extending outwards and radially from the outer peripheral wall of the shell, and the flange is positioned between the pressure plate and the bracket; and the damping pad is provided with two damping pads, one damping pad is arranged between the flange and the pressure plate and is contacted with the pressure plate, the other damping pad is arranged between the flange and the support and is contacted with the support, and at least two convex parts extending towards the flange are formed on the end surface of at least one damping pad facing the flange. The utility model discloses a damping piece includes that the damping fills up and set up the bulge on the damping pad, so can increase the compression capacity of damping piece, makes the natural frequency reduce.

Description

Vibration reduction structure of motor of range hood and range hood comprising vibration reduction structure

Technical Field

The utility model belongs to the technical field of range hood, concretely relates to range hood's damping structure of motor and contain range hood of this damping structure.

Background

The range hood has become indispensable household electrical appliances in kitchen appliances, and the existing range hood mainly drives the impeller to work through the motor, so that the motor is used as a main excitation source, the vibration noise of the motor has great influence on the vibration noise of the whole range hood, and the noise of the range hood mainly consists of the pneumatic noise of a fan system and the structural noise of a mechanism. The structural noise of the mechanism is mainly that a motor is transmitted to the whole machine through a motor bracket, so that the whole machine metal plate vibrates to generate noise. Therefore, aiming at the root of structural noise, the vibration isolation mode of the motor is improved most effectively.

As shown in "motor assembly and range hood with the same" disclosed in chinese utility model patent with patent number CN201320582922.9 (publication number CN203504344U), "the motor assembly includes: an electric machine including a housing and a flange extending radially outward from the housing; the bracket is sleeved on the outer surface of the motor and is positioned on one axial side of the flange edge; the pressing plate is sleeved on the outer surface of the motor and is positioned on the other axial side of the flange edge; the shock pad is wrapped on the flange edge of the motor, the shock pad is annular and has a certain thickness, an inwards concave part is formed in the inner diameter of the shock pad, the concave part is also constructed into an annular shape, the flange edge can be accommodated in the concave part, the shock pad is wrapped on the flange edge of the motor, and therefore the shock pad can absorb vibration energy of the motor along the radial direction. The vibration absorption device comprises a support, a pressure plate, a shock absorption pad, a vibration absorption plate and a motor, wherein the surfaces of two axial sides of the shock absorption pad are respectively contacted with the support and the pressure plate, and therefore the shock absorption pad can absorb vibration energy of the motor along the axial direction.

The patent has the defects that: 1. the thicknesses of all parts of the shock pad are consistent, the compression amount is small, and the thicknesses of the convex parts arranged on the shock pad are also consistent, so that the compression amount of the shock pad is constant and the compression amount is small, and the shock absorption effect of the shock pad is to be further improved; 2. the vibration reduction in the radial direction of the patent is realized by accommodating the flange edge in the concave part, so that the flange edge and the concave part need to be tightly matched to achieve a better vibration reduction effect, but the flange edge is difficult to assemble in the concave part; 3. in addition, the support, the flange edge, the pressing plate and the shock pad are connected through screws so as to achieve positioning and installation among the support, the flange edge, the pressing plate and the shock pad, but the shock pad vibration isolation effect through screw pressing is poor, and vibration energy can still be transmitted to the whole machine through the screws.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the first technical problem that will solve is to prior art's current situation, provides the damping structure of the great range hood's of the compressive capacity of a shock attenuation piece motor.

The utility model discloses the second technical problem that will solve is to prior art's current situation, provides the great range hood that contains above-mentioned damping structure of the compressive capacity of a shock attenuation piece.

For solving the first technical problem, the utility model discloses the technical scheme who adopts is: a vibration damping structure of motor of range hood comprises

The bracket is arranged on a volute of the range hood;

the pressing plate is arranged side by side with the bracket, a space is formed between the pressing plate and the bracket, and the pressing plate and the bracket are connected through a connecting piece;

the motor comprises a shell penetrating through the pressure plate and a flange extending outwards and radially from the outer peripheral wall of the shell, and the flange is positioned between the pressure plate and the bracket;

it is characterized by also comprising

And the damping pad is provided with two damping pads, one damping pad is arranged between the flange and the pressure plate and is contacted with the pressure plate, the other damping pad is arranged between the flange and the support and is contacted with the support, and at least two convex parts extending towards the flange are formed on the end surface of at least one damping pad facing the flange.

In order to achieve a better vibration reduction effect, the protruding parts are columnar, and the heights of at least two protruding parts on the same vibration reduction pad are different.

In order to further enable the vibration damping component to disperse and better absorb vibration in the circumferential direction, at least two of the convex parts on the same vibration damping pad are arranged along the circumferential direction of the vibration damping pad to form a group of convex parts, and at least two of the convex parts in the group of the convex parts in the same group are different in height. When the vibration reduction component is under the action of motor load, the higher bulge part is pressed and deformed, and the lower bulge part is not pressed, the middle part of the vibration reduction component is loaded and changed into wave shape, vibration energy is transmitted through the bulge parts and the middle bending waves which are sequentially and alternately arranged in height, vibration in any direction can be well dispersed and absorbed, and the transmission efficiency is lowest.

In order to further enable the vibration damping component to disperse and better absorb vibration in the circumferential direction, the protruding part groups are provided with at least two groups which are arranged at intervals, and the heights of two adjacent protruding parts in at least one group of protruding part groups are different.

For the convenience of the processing preparation of damping piece, the bulge on the same damping pad is first bulge and second bulge respectively, and the height of first bulge is greater than the second bulge, and in the same a set of bulge group, first bulge and second bulge set up in proper order in turn, and the height of bulge so only has two kinds, the preparation of the mould of being convenient for.

In order to further enable the vibration damping component to disperse and absorb vibration in the radial direction better, the heights of the convex parts in the same radial direction of the vibration damping pad in two adjacent groups of convex parts are different.

In order to carry out the tangential damping, have two at least perforation along the circumference interval on the flange of motor, each correspond in the perforation and wear to establish and fix a position and have a reference column along motor axial extension, be equipped with the elastic component between two adjacent reference columns, the both ends of elastic component lean on the reference column that corresponds the side respectively. The elastic component can play the effect of tangential damping to the easy assembly of elastic component and reference column only needs to wear to establish the reference column in perforating, then set up between two adjacent reference columns the elastic component can.

To facilitate fitting or removal of the positioning post in or from the through-hole, said through-hole is located at the rim of the flange.

In order to prevent interference between the positioning columns and the protruding parts, an avoiding section for avoiding the positioning columns is arranged between at least two adjacent protruding parts of each group of protruding part groups.

In order to prevent the connecting member from passing through the vibration damping member, to reduce the vibration isolating effect of the vibration damping member, or to transmit vibration through the connecting member, the pressing plate is formed at a peripheral edge thereof with a circumferential wall extending toward the bracket and accommodating the two vibration damping pads therein, and a connecting portion extending radially is formed from a peripheral edge of the circumferential wall, and the bracket and the connecting portion are connected by the connecting member. Therefore, the connecting piece does not penetrate through the damping piece, and the damping performance of the damping piece cannot be influenced.

For solving the second technical problem, the utility model discloses the technical scheme who adopts is: a range hood applying the vibration reduction structure.

Compared with the prior art, the utility model has the advantages that: the utility model discloses a damping piece includes the damping pad and sets up the bulge on the damping pad, so can increase the compressive capacity of damping piece, make natural frequency reduce, and be located the high difference of the bulge on same damping pad, then under the motor load effect as the rubber pad, higher bulge compressive deformation, lower bulge is not when the pressurized yet, its middle part is loaded and becomes the wave, the vibration energy transmits through bulge and the middle bending wave that highly set up in turn in proper order, can disperse and absorb the vibration of arbitrary direction betterly, and transmission efficiency is low.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 with the platen removed;

FIG. 3 is an exploded view of FIG. 1;

FIG. 4 is a schematic view of one of the damping members of FIG. 3;

fig. 5 is a cross-sectional view of fig. 1.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1 to 5, the range hood of the preferred embodiment has a vibration reduction structure for reducing the influence of the motor vibration on the whole machine, and the vibration reduction structure includes a bracket 1, a pressure plate 2, a motor 3 and a vibration reduction member 45.

The support 1 is arranged on a volute of the range hood, and the pressure plate 2 and the support 1 are arranged side by side and have a distance therebetween.

The motor 3 includes a housing 32 penetrating the pressure plate 2 and a flange 31 extending radially outward from an outer peripheral wall of the housing 32, the flange 31 being located between the pressure plate 2 and the holder 1.

As shown in fig. 2 and 5, there are two damping members 45, each damping member 45 includes a damping pad 4 and a protrusion 5, one damping pad 4 is disposed between the flange 31 and the pressing plate 2 and abuts against the pressing plate 2, the other damping pad 4 is disposed between the flange 31 and the bracket 1 and abuts against the bracket 1, the protrusion 5 is formed on the end surface of the corresponding damping pad 4 facing the flange 31 and extends toward the flange 31, and each protrusion 5 is in a column shape.

As shown in fig. 4, a plurality of protrusions 5 on the same damping pad 4 are arranged along the circumference of the damping pad 4 to form a group of protrusion groups 5a, in this embodiment, three groups of protrusion groups 5a are arranged at intervals, wherein in two groups of protrusion groups 5a, two adjacent protrusions 5 of each protrusion group 5a have different heights (the height refers to the vertical distance from the top end to the bottom end of the protrusion 5), in this embodiment, two types of protrusions are arranged on the same damping pad 4, and are respectively a first protrusion 51 and a second protrusion 52, the height of the first protrusion 51 is greater than that of the second protrusion 52, and in the same group of protrusion groups 5a, the first protrusion 51 and the second protrusion 52 are arranged alternately in sequence; the third group of protrusions 5a disposed between the two groups of protrusions 5a has all the protrusions 5 with the same height and lower height (the second protrusions 52), and the protrusions in this group of protrusions 5a are disposed only between the adjacent first protrusions 51 in the two groups of protrusions 5a, and thus are disposed between two second protrusions 52 in the same radial direction, and no protrusions 5 of the third group of protrusions 5a are disposed, so that the protrusions 5 in the same radial direction of the damping pad 4 in the two groups of protrusions 5a have different heights.

Therefore, when the vibration damping piece is under the load action of the motor 3, the higher protruding part 5 is pressed to deform, and when the lower protruding part 5 is not pressed, the middle part of the vibration damping piece is loaded to be changed into a wave shape, vibration energy is transmitted through the protruding parts 5 and the middle bending waves which are alternately arranged in sequence, the vibration in any direction can be well dispersed and absorbed, and the transmission efficiency is lowest.

As shown in fig. 2, at least two through holes 311 are formed at the edge of the flange 31 of the motor 3 at intervals along the circumferential direction, a positioning column 75 extending along the axial direction of the motor 3 is correspondingly arranged and positioned in each through hole 311, an elastic member 6 is arranged between two adjacent positioning columns 75, two ends of the elastic member 6 respectively abut against the positioning columns 75 at the corresponding side, and an avoiding section 53 for avoiding the positioning column 7 is formed between at least two adjacent protruding portions 5 of each group of protruding portion groups 5 a. The elastic part 6 can play a tangential vibration reduction role, when the assembly is carried out, only the positioning columns 75 need to be arranged in the through holes 311 in a penetrating mode, and then the elastic part 6 is arranged between every two adjacent positioning columns 75. In this embodiment, the elastic member 6 is a spring, and the positioning column 75 is a rubber column.

As shown in fig. 1, the pressing plate 2 has a first through hole 21 for the housing 32 of the motor 3 to pass through, the bracket 1 is provided with a second through hole 13 for the housing 32 to pass through, a ring wall 22 extending toward the bracket 1 and accommodating two vibration damping pads therein is formed on the periphery of the pressing plate 2, a connecting portion 23 extending in the radial direction is formed on the periphery of the ring wall 22, the connecting portion 23 is provided with a first connecting hole, the bracket 1 is provided with a second connecting hole, and the bracket 1 and the connecting portion 23 are connected by a connecting member 24 passing through the first connecting hole and the second connecting hole. Therefore, the connecting piece 24 does not penetrate through the vibration damping piece 45, the vibration damping performance of the vibration damping piece 45 is not influenced, vibration is not transmitted to the volute through the connecting piece, and the connecting piece 24 can be selected from bolts.

To demonstrate the damping effect of the damping member 45 of the present embodiment:

the physical quantity indicating the vibration damping effect is large, and the most commonly used is the transmission rate T. The transmission rate T is the ratio of the force transmitted through the vibration-damping element to the total disturbance force, i.e. T is the transmission force/disturbance force

The smaller the value of T, the better the vibration isolating effect, the smaller the force transmitted through the vibration isolating member.

T＝1/[1-(f/f0)2]

(1)

f frequency of exciting force of vibration source, HZ

f0 resonance frequency of the vibration isolation system, HZ.

The static sinkage dcm of the vibration isolation system is of great importance.

The transfer efficiency T is strongly related to the frequency ratio f/f 0.

When F/F0 1, the transmission efficiency T is slightly more than 1, the disturbance frequency of the external force is lower than the natural frequency of the system, the external force is mainly resisted by the elastic force of the rubber pad, the disturbance force is transmitted to the foundation through the spring without reduction, the amplitude x of the machine is F0/K, namely, the vibration isolation system is in inverse proportion to the stiffness of the vibration isolation system, and the vibration isolation system does not play a role in vibration isolation.

When f/f0 is 1, the transfer efficiency is the greatest. The vibration isolation effect is not achieved, but the interference of vibration is amplified, and even vibration isolation is achieved.

When f/f0> √ 2, the T transmission efficiency is less than 1, the vibration isolation system plays a vibration isolation role, and the higher the f/f0 ratio is, the better the vibration isolation effect is.

Therefore, the ratio of f0 to f is as low as possible to obtain the better vibration isolation effect.

The excitation frequency of the tested existing motor is generally about 20HZ, and the natural frequency calculation equation of the rubber pad is as follows:

the formula for the tensile deformation of the shaft (within the elastic limit) is:

f is the magnitude of the tensile and compressive force, and the unit is N;

the original height of the L-axis;

ES is the modulus of elasticity;

cross-sectional area of axis a.

Δ l ═ dcm can be obtained by substituting formula (3) into formula (2):

the dynamic elastic modulus Ed of the soft rubber is 50kg/cm, F is motor weight 4.8kg 9.8(N/kg) 480N, and L is 2cm

Substituting: f0 ═ 1.11 √ A

Maximum allowed d_cm＝0.5cm f0＝5Hz A＝0.192cm²＝1920mm²

According to A1920 mm²The area of the obtained circular truncated cone is 13.33mm². Then r is 2.06mm, and an integer is taken. The area of one round table is R-2, A-pi R²12.56, total area A1808 mm²To optimize the solution.

In the present embodiment, the compression amount of the vibration damping structure is increased to lower the natural frequency (f0 ═ 5 Hz). f/f0 is 4, so that the vibration isolation effect is good.

Claims

1. A vibration damping structure of motor of range hood comprises

The bracket (1) is arranged on a volute of the range hood;

the pressing plate (2) is arranged side by side with the bracket (1), a space is reserved between the pressing plate and the bracket, and the pressing plate and the bracket are connected through a connecting piece (24);

the motor (3) comprises a shell (32) penetrating through the pressure plate (2) and the bracket (1) and a flange (31) extending outwards and radially from the outer peripheral wall of the shell (32), wherein the flange (31) is positioned between the pressure plate (2) and the bracket (1);

it is characterized by also comprising

And the two damping pads (4) are arranged, one damping pad is arranged between the flange (31) and the pressure plate (2) and is in contact with the pressure plate (2), the other damping pad is arranged between the flange (31) and the support (1) and is in contact with the support (1), and at least two bulges (5) extending towards the flange (31) are formed on the end surface of at least one damping pad (4) facing the flange (31).

2. The vibration reduction structure of the motor of the range hood according to claim 1, characterized in that: the bulges (5) are columnar, and the heights of at least two bulges (5) on the same damping pad (4) are different.

3. The vibration reduction structure of the motor of the range hood according to claim 2, characterized in that: at least two of the bulges (5) on the same damping pad (4) are arranged along the circumference of the damping pad (4) to form a group of bulges (5a), and at least two of the bulges (5) in the same group of bulges (5a) have different heights.

4. The vibration reduction structure of the motor of the range hood according to claim 3, characterized in that: the protruding part groups (5a) are provided with at least two groups which are arranged at intervals, and the adjacent two protruding parts (5) in at least one group of protruding part groups (5a) have different heights.

5. The vibration reduction structure of the motor of the range hood according to claim 4, characterized in that: the same convex parts (5) on the damping pad (4) are respectively a first convex part (51) and a second convex part (52), the height of the first convex part (51) is larger than that of the second convex part (52), and in the convex part group (5a) of the same group, the first convex part (51) and the second convex part (52) are sequentially and alternately arranged.

6. The vibration reduction structure of the motor of the range hood according to claim 4, characterized in that: in two adjacent groups of the protruding parts (5a), the protruding parts (5) positioned in the same radial direction of the damping pad (4) have different heights.

7. The vibration reduction structure of the motor of the range hood according to any one of claims 3 to 6, wherein: have two at least perforation (311) along circumference interval on flange (31) of motor (3), each corresponding wear to establish and be located one along motor (3) axial extension reference column (7) in perforation (311), be equipped with elastic component (6) between two adjacent reference columns (7), the both ends of elastic component (6) are supported respectively and are leaned on reference column (7) that correspond the side.

8. The vibration reduction structure of the motor of the range hood according to claim 7, characterized in that: an avoidance interval (53) for avoiding the positioning column (7) is arranged between at least two adjacent convex parts (5) of each group of convex part groups (5 a).

9. The vibration reduction structure of the motor of the range hood according to any one of claims 1 to 6, wherein: the periphery of the pressure plate (2) is formed with an annular wall (22) which extends towards the support (1) and accommodates the two damping pads (4) therein, a connecting part (23) which extends in the radial direction is formed from the periphery of the annular wall (22), and the support (1) and the connecting part (23) are connected through the connecting part (24).

10. A range hood, its characterized in that: a vibration damping structure according to any one of claims 1 to 9.