Damper for vertical rotor

FIELD: mechanical engineering.

SUBSTANCE: damper comprises housing mounted in its space filled with damping fluid, main movable member made of a rotation body and provided with additional damping member, bearing for the rotor, and centering springs secured in the top part of the main movable member pivotally connected with the bottom part through the bearing needle and bearing thrust. The additional damping member is connected with the main movable member and is set in the groove in the housing that defines damping spaces around the additional damping member.

EFFECT: expanded functional capabilities.

6 cl, 5 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 R.U 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, hinge on the fourth bottom in 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.

Closest to the invention is the damper [patent UK 1570358, WV 9/12, F16C 23/04, 02.07.1980], consisting of a rolling cylinder in the form of two-way glass, with a bearing for supporting a rotor mounted in the bottom of the Cup with its top side, supported on the upper side of the flexible membrane having on the lower side of the ferromagnetic disk perpendicular to its axis, a peripheral part located in a horseshoe-shaped cavity ring magnet placed in the groove of the housing, supported the lower side of the bottom of the flexible needle moveable cylinder only in the radial direction, which is installed in a cavity filled with damping fluid in the case of a support having an internal return Cup of smaller diameter. Damping is effected in the radial direction due to the movement of the fluid in the gaps between the wall of the Cup and cylinder, and also due to the electromagnetic interaction of the ferromagnetic disk and magnet. The design of the damper allows you to pass through the critical speed during acceleration of the rotor to its working speed.

The disadvantage is instrukcii is despite the elastic bearing of the rolling cylinder of the damper and the presence of a disk that is installed perpendicular to the cylinder and placed in the annular groove in the cavity filled with damping fluid damping it is only in the radial direction, which does not provide for suppression of complex oscillations multi rotor systems - both radial and axial.

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 problem is solved due to the fact that the damper vertical rotor, comprising a housing installed in its cavity filled with damping fluid, a main movable element in the form of rotation of a body, provided with at least one additional damping element, a bearing for supporting the rotor and the centering spring is fixed in the upper part of the main rolling element, which is pivotally supported with its lower part through the sample needle and the thrust bearing on the elastic element of the main rolling element, at least one additional damping element is attached in the annular groove of the main rolling element and race is halogen with damping gaps in the annular groove of the housing.

In addition, the damper vertical rotor elastic element of the rolling element of the damper can be made in the form of at least one floppy disk, fixed on the contour in the body of the damper.

In addition, at least one additional damping element can be made in the form of a ring attached to the primary rolling element via an elastic suspension element.

In addition, at least one additional damping element of the damper is made in the form of a disk perpendicular to the main axis of the rolling element. In addition, additional damping elements of the damper are located near the ends of the main moving element.

In addition, additional damping elements in the form of rings having the same or different stiffness of the elastic suspension elements.

In addition, additional damping elements made in the form of disks having the same or different Flexural rigidity.

The invention is illustrated by drawings:

1 - damper vertical rotor;

figure 2 - damper with the main movable element supported on a floppy disk, where fixed on the contour in the body of the damper;

figure 3 - damper with an additional element in the form of a ring;

4 is a damper with an additional element in the form of a disk;

5 is a damper with two to animalname elements.

The damper includes a housing 1 mounted in the cavity 2 is filled with damping fluid 3, the main movable element 4 in the form of a body of rotation with at least one annular groove 5, a bearing 6 for supporting the rotor 7, the centering spring 8, is fixed in the upper part of the main moving element 4, which is pivotally supported with its lower part through the sample needle 9 and the thrust bearing 10 on the elastic element 11, moveable in the axial direction and providing a rigid alignment in the radial direction. In the housing 1 has at least one annular groove 12, in which the damping gaps 13 are placed one additional damping element 14 attached to the primary rolling element 4 in the annular groove 5.

Additional damping element can be made in the form of a ring 15 attached to the primary rolling element 4 in the annular groove 5 through the elastic suspension elements 16.

Additional damping element can be made in the form of a disk 17 which is perpendicular to the main axis of the rolling element 4 and rigidly connected with him in the annular groove 5.

Additional damping elements 14 attached in different annular grooves 5 of the main moving element 4 can be located in its middle part, and near its ends, and could the t to be placed, accordingly, in various annular grooves 12 of the housing.

Attach additional damping elements 14 to the main rolling element 4 in the annular grooves 5 can significantly increase the damping surface of the damper with constant mass and moments of inertia of its moving parts.

Moreover, if additional damping elements in the form of rings 15, the elastic elements of the suspension 16 may have either the same stiffness or different.

If additional damping elements made in the form of discs 17, the discs 17 may have either the same Flexural rigidity or different.

The main movable element 4 may be supported with its lower part through the sample needle 9 and the thrust bearing 10 on the elastic element 18 made in the form of one or more floppy disks, fixed on the contour in the housing 1 of the damper.

The work of the damper is as follows.

When casting the rotor 7 to rotate at different speeds can occur its radial and axial vibrations. When the rotor 7 through the bearing 6 results in radial or axial oscillatory movement of the main movable element of the damper 4. Associated with at least one additional damping element 14 of the damper, also comes in a radial or Axia is inoe oscillatory motion. Thus, moving together in the cavity 2 is filled with damping fluid 3, the two movable elements are involved in the work of damping both in radial and in axial direction.

When the low-frequency radial vibrations of the rotor 7 through the bearing 6 a rocking motion of the main movable element 4 without bending supporting needle 9 on the thrust bearing 10 in the cavity 2 with the damping fluid 3.

Moving the main moving element 4 and the additional damping element 14 in the damping liquid 3 causes partial absorption of the energy of oscillation of the rotor 7, the efficiency of which depends on the total area of the damping surfaces of the movable elements. As a result, the amplitude of radial vibrations of the rotor is reduced.

In this form of oscillation of the primary moving element 4, the efficiency of the damping by adding damping surface of the additional damping element 14 to the damping of the main surface of the rolling element 4 not so much.

However, when high-frequency radial vibrations of the rotor 7 through the bearing 6 a rocking motion of the main movable element 4 around its center of pressure located approximately in its middle part, with the bending of the support needle 9.

In this form of oscillation of the main rolling element 4 is substantially what I additive damping surface to the main surface of the rolling element 4, due to the additional surface of the rolling element 14, which is expressed in the form of a General increase in the efficiency of radial damping, especially in the field of natural frequencies of the primary moving element 4, and the extension due to this effective frequency range of the damper.

When the axial oscillations of the rotor 7 through the bearing 6 a rocking motion of the main movable element 4 in the damping liquid 3 on the elastic element 11. Together with the main movable element 4 in the annular groove 12 of the housing moves synchronously additional damping element 14, having a significant dampening the surface.

Moving additional damping element 14 causes the flow of damping fluid 3 in the damping gaps 13 of the annular groove 12 of the housing 1, which leads to absorption of energy of oscillations of the rotor 7 and the reduction of the amplitude of its axial vibrations.

Thus, the introduction in the design of the damper additional damping elements described construction allowed in almost constant mass and moments of inertia of the moving parts of the damper to significantly increase its working surface. As a result, the total angular rigidity on the main element of the damper is increased, providing a General improvement in efficiency, especially in the field of frequency settings of the OS the ESD element, and a significant expansion of the frequency range at lower operating movement of the main movable element.

In addition, the damper acquired an additional efficiency in the axial direction.

1. The damper vertical rotor, comprising a housing installed in its cavity filled with damping fluid, a main movable element in the form of rotation of a body, provided with at least one additional damping element, a bearing for supporting the rotor and the centering spring is fixed in the upper part of the main rolling element, which is pivotally supported with its lower part through the sample needle and the thrust bearing on the elastic element of the primary moving element, wherein the at least one additional damping element is attached in the annular groove of the main moving element and is located on the damping gaps in the annular groove of the housing.

2. The damper according to claim 1, characterized in that the elastic element of the primary moving element of the damper is made in the form of at least one floppy disk, fixed on the contour in the body of the damper.

3. The damper according to claim 1 or 2, characterized in that at least one additional damping element is designed in the form of a ring attached to the primary rolling element via an elastic element of the evaluation of the ski.

4. The damper according to claim 1 or 2, characterized in that at least one additional damping element of the damper is made in the form of a disk perpendicular to the main axis of the rolling element.

5. The damper according to claim 1, characterized in that the additional damping elements of the damper are located near the ends of the main moving element.

6. The damper according to claim 3, characterized in that the additional damping elements in the form of rings having the same or different stiffness of the elastic suspension elements.

7. The damper according to claim 4, characterized in that the additional damping elements made in the form of disks having the same or different Flexural rigidity.



 

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