Damper

FIELD: mechanical engineering.

SUBSTANCE: invention relates to devices for suppressing mechanical vibrations of rotary systems. Proposed damper has housing and main movable element installed in housing filled with damping liquid. Main movable element is made in form of solid of revolution, is furnished with additional damping element and is hinge-rested by lower part through support needle and step bearing onto elastic member. Alignment springs are secured in upper part of main movable element. Additional damping element is fitted with damping clearances in ring groove of housing, it encloses main movable element and is connected to main movable element through elastic hanger whose vertical arrangement depends on adjustment of damper in frequency.

EFFECT: increased efficiency of damping and enlarged range of frequency damping in radial direction, provision of additional damping in axial direction.

10 cl, 9 dwg

 

The invention relates to mechanical devices for the suppression of mechanical vibrations of the rotor system, and can be used as a damping element of the lower support vectors machines and devices with a vertical axis of rotation, for example, energy storage, ultracentrifuge.

Improvement of centrifuge technology is inextricably linked with the growth of the values of operating speeds of rotation of the rotors and the increase in the number of their links, which involves rotation of the rotors in the supercritical region. The consequence of these trends is the emergence of additional zones of instability of a rotating rotor, which are characterized by complex joint fluctuations of its elements simultaneously and in radial and in axial directions. The latter circumstance leads to an increase in the width of the operating frequency range, within which can show all the peculiarities of this system, problems with stability and, consequently, inability to cope with these problems by using damping devices that have a limited number of private ongoing degrees of freedom.

Known damper rotor centrifuge [patent RU 2044936, F16F 9/10, 15/023, 03.07.1992], consisting of a rolling cylinder with a bearing for supporting the rotor and the centering springs in the upper part, the hinge op who rty the lower part of the tank, filled with damping fluid. Damping is accomplished by movement of the fluid in the gap between the housing and the cylinder. The design of the damper allows to suppress low-frequency radial vibrations of the rotor when passing them to "trigger" the frequency and precession variations in the rotation speed.

A disadvantage of the known designs is that the design of the damper provides damping only in the radial direction and in only two areas of the frequencies that are not acceptable to suppress vibrations of multi-rotor systems.

Also known damper for high-speed rotors [patent Germany 2337190, F16F 15/02, 21.07.1973], consisting of a rolling cylinder in the form of two-way glass, supported the lower side of the bottom of the spring mounted in the support body is filled with damping fluid and having an internal return Cup of smaller diameter, with a bearing for supporting a rotor mounted in the bottom of the glass, with its upper side. Damping is accomplished by movement of the fluid in the gaps between the wall of the Cup and cylinder. The design of the damper allows you to go through 2-3 critical speed during acceleration of the rotor to its working speed.

A disadvantage of the known construction is that, despite the elastic OPI is the W rolling glass damper and extended the frequency range of the damper, damping is carried out only in the radial direction, which does not provide suppression complex (radial and axial vibrations of multi-rotor systems.

The present invention aims to increase the overall efficiency of the damping and the frequency range extension of the effective damping in the radial direction, and the implementation of additional damping in the axial direction.

This is solved due to the fact that the damper comprising a housing installed in its cavity filled with damping fluid, a main movable element in the form of a body of rotation, provided with an additional damping element and pivotally supported with its lower part through the sample needle and the thrust bearing on the elastic element, the centering spring is fixed in the upper part of the main rolling element bearing for supporting the rotor, an additional damping element is located on the damping gaps in the annular groove of the casing and covers the main movable element, and attached to the main rolling element via an elastic suspension, the vertical position of which is determined by the setting of the damper frequency.

Furthermore, an additional damping element can be designed as a sleeve.

Furthermore, an additional damping element can be the made in the form of several concentric sleeves, the vertical position of which is determined by a single setting of the damper according to the frequency, while the elastic suspension is fixed to the main rolling element in the same horizontal plane.

Furthermore, an additional damping element can be made in the form of several concentric sleeves, the vertical position of which is determined by different settings of the damper according to the frequency, while the elastic suspension is fixed to the main rolling element in different horizontal planes.

Furthermore, an additional damping element can be made in the form of short sleeves, vertically spaced relative to each other, the vertical position of which is determined by different settings of the damper frequency.

In addition, the elastic suspension can be made in the form of a disk.

In addition, the disk can be made holes.

In addition, the elastic suspension can be made in the form of spokes.

In addition, the elastic suspension can be made in the form of corrugation.

In addition, the elastic suspension can be made in the form of brackets.

The invention is illustrated by drawings:

figure 1 is a vertical section of the damper;

figure 2 is a vertical section of the damper with multiple concentric sleeves, with elastic fastening the brackets to the main rolling element in the same horizontal plane;

IG - the vertical section of the damper with multiple concentric sleeves, with elastic fastening the brackets to the main rolling element in different horizontal planes;

4 is a vertical section of the damper with multiple sleeves, vertically spaced relative to each other;

5 is a vertical section of the damper and an elastic suspension in the form of a disk with holes;

6 is a horizontal section of the damper and an elastic suspension in the form of spokes;

Fig.7 is a vertical section of the damper and an elastic suspension in the form of a corrugation;

Fig - horizontal section of the damper and an elastic suspension in the form of staples;

figure 9 is a vertical section of the damper and an elastic suspension in the form of brackets.

The damper includes a housing 1, a main movable element 2 in the form of a body of revolution mounted in the cavity 3 of the housing 1 filled with damping fluid 4, the bearing 5 for supporting the rotor 6, the centering spring 7, is fixed in the upper part of the main moving element 2, which is pivotally supported with its lower part through the sample needle 8 and the thrust bearing 9 on the elastic element 10, moveable in the axial direction and providing a rigid alignment in the radial direction. In the housing 1 has at least one annular groove 11, in which the damping gap 12 with the housing 1 and the damping gap 13 with the main movable uh what Eminem 2 placed one additional damping element 14, attached to the main rolling element 2 through the elastic suspension 15, the vertical position of which is determined by its minimum bend when forced oscillations of the primary moving element 2 and the additional damping element 14 in the radial direction at a given harmonic force on the bearing 5 of the rotor 6 in the horizontal plane.

Additional damping element 14 may be made in the form of a sleeve.

Additional damping element can be made in the form of several concentric sleeves 14, 16 in the annular groove 11 of the housing 1 with the fastening elastic suspensions 15, 17 to the main movable element 2 in the same horizontal plane, the position of which is determined by the minimum bending elastic suspensions 15, 17 with a single harmonic force on the bearing 5 of the rotor 6 in a horizontal plane, with damping gaps 12, 13, 18 relative to the housing 1, the main movable element 2 and to each other, respectively.

Additional damping element can be made in the form of several concentric sleeves 14, 16 in the annular groove 11 of the housing 1 with the fastening elastic suspensions 15, 17 to the main movable element 2 in different horizontal planes, the position of which is determined by the minimum bending elastic suspensions 15, 17 separately for different Harmon is mental effort on the bearing 5 of the rotor 6 in a horizontal plane, with damping gaps 12, 13, 18 relative to the housing 1, the main movable element 2 and to each other, respectively.

Additional damping element can be made in the form of short sleeves 14, 19, each in its annular groove 11, 20 of the housing 1 with damping gaps 12, 21 with the housing 1 and the damping gaps 13, 22 with the main movable element 2 with fastening elastic suspensions 15, 23 to the main movable element 2 in different horizontal planes, the position of which is determined by the minimum bending elastic suspensions 15, 23 separately for different harmonic efforts on the bearing 5 of the rotor 6 in the horizontal plane.

Elastic suspension 15 may be made in the form of a disk.

Elastic suspension can be made in the form of a disk with holes 24.

Elastic suspension can be made in the form of spokes 25.

Elastic suspension can be made in the form of corrugations 26.

Elastic suspension can be made in the form of brackets 27.

The work of the damper is as follows.

When casting the rotor 6 to rotate at different speeds of rotation can occur its radial and axial vibrations. When the rotor 6 through the bearing 5 results in radial or axial oscillatory movement of the main movable element of the damper 2. The associated additional damping element 14 also comes in idialnoe or axial oscillatory motion. Thus, moving together in the cavity 3 and the annular groove 11 is filled with a damping liquid 4, both movable elements provide damping both in radial and in axial direction.

When the vibrations of the rotor 6 in the radial direction with frequencies close to the frequency of the damper, which is provided by setting an additional element 14, there is a harmonic force on the bearing 5, in which the elastic suspension 15 effort is minimal, i.e. additional damping element 14 is moved with a minimum of delay relative to the main movable element 2, for all generalized coordinates. At this harmonic force additional damping element 14, the main movable element 2 and the damping liquid 4 in the damping gap 13 can be considered as one rigid body, work force dissipation increases, which increases the effectiveness of the damping at frequencies close to the frequency of the damper, which is provided by setting up additional item 14.

When the vibrations of the rotor 6 in the radial direction with a frequency coinciding with the frequency of the damper, which is provided by setting an additional element 14, on the main movable element 2 wasnike the additional elastic force through elastic suspension 15, that increases the frequency of the primary moving element 2, which allows to extend the frequency range of efficient operation of the damper.

Additional damping elements 14, 16, 19 are also additional dynamic damper as in radial and axial directions with its own settings.

When implementing additional damping element in the form of several additional oscillating circuits of the following options:

- several concentric sleeves 14, 16 in the annular groove 11 of the housing 1 with the fastening elastic suspensions 15, 17 to the main movable element 2 in the same horizontal plane, the position of which is determined by the minimum bending elastic suspensions 15, 17 with a single harmonic force on the bearing 5 of the rotor 6 in a horizontal plane, with damping gaps 12, 13, 18 relative to the housing 1, the main movable element 2 and to each other, respectively;

- several concentric sleeves 14, 16 in the annular groove 11 of the housing 1 with the fastening elastic suspensions 15, 17 to the main movable element 2 in different horizontal planes, the position of which is determined by the minimum bending elastic suspensions 15, 17 separately for different harmonic efforts on the bearing 5 of the rotor 6 in a horizontal plane, with dampfi the existing gaps 12, 13, 18 relative to the housing 1, the main movable element 2 and to each other, respectively;

- short sleeves 14, 19, each in its annular groove 11, 20 of the housing 1 with damping gaps 12, 21 with the housing 1 and the damping gaps 13, 22 with the main movable element 2 with fastening elastic suspensions 15, 23 to the main movable element 2 in different horizontal planes, the position of which is determined by the minimum bending elastic suspensions 15, 23 separately for different harmonic efforts on the bearing 5 of the rotor 6 in the horizontal plane.

When using multiple bushings, variously located or fixed relative to each other, the principle of operation of the damper remains the same.

Introduction to the construction of the additional damping element is allowed to increase the overall efficiency of the damping, to extend the frequency range of the effective damping in the radial direction and implement additional damping in the axial direction, providing suppression of complex multifrequency oscillations of rotor systems.

1. A damper comprising a housing installed in its cavity filled with damping fluid, a main movable element in the form of a body of rotation, provided with an additional damping element and pivotally supported with its lower part through the support which the GLA and the thrust bearing on the elastic element, the centering spring is fixed in the upper part of the main rolling element bearing for supporting the rotor, characterized in that the additional damping element with damping gaps in the annular groove of the casing and covering the main movable element attached to the primary rolling element via an elastic suspension, the vertical position of which is determined by the setting of the damper frequency.

2. The damper according to claim 1, characterized in that the additional damping element is designed as a sleeve.

3. The damper according to claim 1, characterized in that the additional damping element is designed in the form of several concentric sleeves, the vertical position of which is determined by a single setting of the damper according to the frequency, while the elastic suspension is fixed to the main rolling element in the same horizontal plane.

4. The damper according to claim 1, characterized in that the additional damping element is designed in the form of several concentric sleeves, the vertical position of which is determined by different settings of the damper according to the frequency, while the elastic suspension is fixed to the main rolling element in different horizontal planes.

5. The damper according to claim 1, characterized in that the additional damping element is designed in the form of short sleeves, a vertically RA is worn with respect to each other, the vertical position of which is determined by different settings of the damper frequency.

6. The damper according to any one of claims 1 to 5, characterized in that the elastic suspension is made in the form of a disk.

7. The damper according to claim 6, characterized in that the disk with holes.

8. The damper according to any one of claims 1 to 5, characterized in that the elastic suspension is made in the form of needles.

9. The damper according to any one of claims 1 to 5, characterized in that the elastic suspension is made in the form of a flute.

10. The damper according to any one of claims 1 to 5, characterized in that the elastic suspension is made in the form of brackets.



 

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