RU2576844C1 - Kochetov(s damper for vibration insulation system - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: vibration isolation system comprises four bumpers mounted on the base and rigidly connected by means of bolts to the support platform. Every vibration isolator consists of a base and a pendulum suspension. Pendulum suspension comprises a threaded stud with one its end being connected to a supporting arm and other end - to a thrust washer and nut coupled with the bush connected to a ring. Upper flange of a resilient element placed in a protective housing rests against the bush. Base of every vibration isolator is of box-type and includes horizontal supporting plates coupled by vertical partitions. Every resilient element of a vibation isolator is made as a spring with built-in damper. Damper is built into elastic elements and is located inside the spring elements between support rings for fixing the ends of springs. Damper is made in the form of sleeve comprising internally piston with helical grooves on its surface. Piston is connected with rod fitted in sleeve cover. Cover of sleeve comprises fixed sealing cup surrounding the rod. Above-piston and sub-piston cavities of the damper are filled with antifriction grease.

EFFECT: higher efficiency of vibration isolation in resonance mode.

1 cl, 4 dwg

Description

The invention relates to mechanical engineering and can be used for vibration isolation of technological equipment with a shifted center of mass, for example, turning group machines, weaving machines, ventilation unit platforms, etc.

It is known the use of spring elastic elements for vibration isolation of technological equipment in the textile industry [1, 2, 3, 4]. The calculations show the high efficiency of spring elastic elements in vibration isolation systems, while tests in real factory conditions confirm their effectiveness with high reliability and ease of maintenance.

However, a significant height of the springs is required to reduce low-frequency vibrations.

It is known to use spring vibration isolators [5, 6] with a pendulum suspension, which use a suspension type vibration isolation system with a spring elastic element.

The disadvantage of this type of vibration isolators with a pendulum suspension is their large height dimension, since they belong to the category of suspended vibration isolation systems, where the overall dimensions are not limited in height, and relatively small dimensions in height are required for supporting vibration protection systems.

The closest technical solution to the claimed object is a spring vibration isolator with a pendulum suspension according to the patent of the Russian Federation No. 2269699 [7] (prototype), containing a helical coil spring, the lower end of which rests on the upper flange of the housing and interacting with the pendulum mechanism, which is made in the form of a threaded rod with nuts at the ends and supporting washers resting on rubber elastic elements that perform the functions of an elastic hinge, the upper rubber elastic element being located between the upper flange rifles and a supporting washer, and the lower - between the supporting washer and the plate on which the vibration-isolating equipment is mounted.

A disadvantage of the known device is the relatively low efficiency at resonance due to the absence of vibration damping.

The technical result is an increase in the efficiency of vibration isolation in a resonant mode.

This is achieved by the fact that in a vibration isolation system comprising at least four vibration isolators mounted on a base and rigidly connected, by means of bolts, to a support platform for installing vibration-isolating equipment, each of the vibration isolators consisting of a base and a pendulum suspension made in in the form of a threaded rod connected at one end with a support arm for fastening vibration-isolating equipment, and at the other with a thrust washer and nut connected to a sleeve connected to a ring against which The upper flange of the elastic element is placed in a protective casing, and the base of each of the vibration isolators is box-shaped, including horizontal support plates connected by vertical partitions, each of the elastic elements of the vibration isolator is made in the form of a spring with a built-in damper containing a coil spring, consisting of two parts with opposite ends, one part of which has turns of rectangular cross section, and the other part of the spring is hollow, while the opposite direction this end of the first part is placed in the cavity of the second, the gaps of the segment profile of the contacting parts of the spring are filled with antifriction grease, while at the end of the second part of the spring a sealing collar is installed to prevent leakage of lubricant, and the first part of the coil spring, made with coils of rectangular cross section with rounded edges, covers tube made of damping material, such as polyurethane.

In Fig. 1 presents a General layout diagram of the proposed vibration-isolating system, in Fig. 2 is a frontal section of a vibration isolator, in FIG. 3 is a frontal section of a spring, in FIG. 4 - frontal section of the built-in damper located inside the spring.

The damper for the vibration isolation system (Fig. 1), containing at least four vibration isolators 4, mounted on the base 1, and rigidly connected, by means of bolts 5, with a supporting platform 3 for installing vibration-isolating equipment 2. Each of the vibration isolators is made in the form of an elastic element 6 and pendulum suspension 7.

Each of the vibration isolators 4 (Fig. 2) consists of a base and a pendulum suspension 7 made in the form of a threaded rod 11 connected at one end with a support arm 8 for fastening the vibration-insulated equipment 2, and the other with a thrust washer 12 and a nut 10 associated with a sleeve 13 connected to a ring 14, which abuts the upper flange of the elastic element 9, placed in a protective casing 15. In the sleeve 13 coaxially and axisymmetrically to the rod 11 there is a sleeve 17 made of an elastomer, for example polyurethane.

The base of each of the vibration isolators is box-shaped, including horizontal support plates 16 and 18 connected by vertical partitions.

Each of the elastic elements 9 of the vibration isolator is made in the form of a spring with a built-in damper.

A spring with a built-in damper comprises a coil spring, consisting of two parts 21 and 22 with counter-directed ends 24 and 23 of the respective turns of these springs. On the support coils of the spring support rings 19 and 20 are made for strong and reliable fixation of the ends of the springs during their operation.

The first part of the coil spring 21 is made with coils of rectangular (or square) section with rounded edges, and the second part 22 of the spring is hollow, for example of circular cross section, while the counter-directed end 24 of the first part of the spring is placed in the cavity of the counter-directed second part of the spring with the end 23 while its second end, mounted on the support ring 20, is sealed, for example with a screw plug (not shown).

In the cavity of the second spring part 22, made of a hollow circular cross section, formed on four sides, relative to the rectangular cross section of the first spring part 21, the gaps 25 of the segment profile in a section perpendicular to the axis of the contacting parts 21 and 22 of the spring.

For better adjustment of the spring stiffness (without scuffing, jamming or jamming), the gaps 25 of the segment profile of the contacting parts 21 and 22 of the spring are filled with antifriction grease, for example, viscous "solid oil" type, and a sealing lip is installed on the end 23 of the second spring part (not shown in the drawing ) to prevent leakage (loss) of lubricant. This design is a kind of viscous friction damper with an extended throttle element in the form of gaps 25 of the segment profile of the contacting parts 21 and 22 of the spring, which in this case will be analogs of the piston-cylinder system, respectively.

It is possible that each of the elastic spring elements of the vibration isolator is made with a built-in damper (Fig. 4) located axially symmetrically and coaxially inside the spring elements, between the support rings 19 and 20 to fix the ends of the springs, while the damper is made in the form of a sleeve 27, inside of which with a clearance, a piston 31 with screw grooves 32 is located on its surface. The piston is connected to the axisymmetric rod 28 installed in the cover 29 of the sleeve 27, in which a sealing sleeve 30 is fixed, covering the rod 28. The piston and under-piston cavities of the damper are filled with antifriction grease moving along the grooves 32 of the piston 31, creating a damping effect of dispersion of vibrational energy due to friction of the lubricant against the piston helical grooves, and the sealing lip 30 serves to prevent leakage of antifriction grease.

The first part 21 of the coil spring, made with coils of rectangular (or square) section with rounded edges, is covered by a tube 26 of damping material, for example polyurethane, which creates friction in the vibration protection system, the value of which increases when the system approaches the resonance mode, which is analogous dry friction damper.

The damper for the vibration isolation system works as follows.

With vibrations of the vibration-insulated object 2, the spring 9 perceives vertical loads, thereby weakening the dynamic effect on the floors of buildings. Horizontal loads are perceived by a pendulum suspension made in the form of a threaded rod 11 connected at one end to a support arm 8 for fastening a vibroinsulated object 2, and the other with a thrust washer 12 and nut 10. Due to this design of the pendulum suspension, an additional spatial vibration isolation of the equipment is provided by all six directions of vibrations (along the three coordinate axes x, y, z and rotational vibrations around these axes).

A spring with a built-in damper works as follows.

The spring stiffness is adjusted by shortening or lengthening the spring height. When the support rings 19 and 20 rotate, the spring coils move relative to each other in mutually opposite directions relative to the longitudinal axis of the spring, i.e. screwed in or out. In the first case (when screwing in), the stiffness of the spring increases, and in the second case (when unscrewing) it decreases, which makes it easier to adjust the stiffness of the spring.

Thus, due to its selective properties, the spring provides effective spatial vibration isolation of equipment in all six directions of vibration (along the three X.Y, Ζ axes and rotational vibrations around these axes) with vibration damping at resonance, and under various operating conditions.

Thus, due to its selective properties, the spring provides effective spatial vibration isolation of equipment in all six directions of vibration (along the three X.Y, Ζ axes and rotational vibrations around these axes) with vibration damping at resonance, and under various operating conditions.

Sources of bibliographies cited in a patent search:

1. Kochetov O.S., Sazhin B.S. Noise and vibration reduction in production: theory, calculation, technical solutions. M .: MSTU im. A.N. Kosygina, 2001 .-- 319 p.: P. 120, fig. 5.6; p. 287, fig. P.Y.15.

2. Kochetov OS Textile vibroacoustics. Textbook for universities. M .: MSTU im. A.N. Kosygina, the group "Sovezh Bevo" 2003. - 191 p. 3.1; p. 61, fig. 3.4a; fig. 3.5.

3. Kochetov OS Vibration isolators of type "VSK-1" for looms // Textile industry - 2000, No. 5. S. 19 ... 20.

4. Kochetov O.S. Calculation of the spatial vibration protection system. The journal "Occupational Safety in Industry", No. 8, 2009, pp. 32-37.

5. Kochetov O.S., Kochetova M.O., Khodakova TD, Shesterninov A.V. Spring vibration isolator with pendulum suspension // Patent for invention No. 2279589. Published on July 10th, 2006. Bulletin of inventions No. 19.

6. Kochetov O.S., Kochetova M.O., Khodakova TD, Shesterninov A.V. Vibration isolating system // Patent for invention No. 2279586. Published on July 10th, 2006. Bulletin of inventions.

7. Kochetov O.S., Kochetova M.O., Khodakova T.D. Vibration isolator with pendulum suspension // Patent for invention No. 2269699. Posted on 02/10/06. Bulletin of inventions No. 4.

Claims (1)

A damper for a vibration isolation system comprising at least four vibration isolators installed on the base and rigidly connected by bolts to a support platform for installing vibration-isolating equipment, each of the vibration isolators consisting of a base and a pendulum suspension made in the form of a threaded rod connected at one end with a support arm for attaching vibration-isolating equipment, and another with a thrust washer and nut associated with a sleeve connected to a ring against which the upper flange abuts The elastic element is placed in a protective casing, and the base of each of the vibration isolators is box-shaped, including horizontal support plates connected by vertical partitions, each of the elastic elements of the vibration isolator is made in the form of a spring with a built-in damper containing a cylindrical coil spring, consisting of two parts with opposite ends, one part of which has turns of rectangular cross section, and the other part of the spring is hollow, while the opposite end of the first of the second part is placed in the cavity of the second, the gaps of the segment profile of the contacting parts of the spring are filled with antifriction grease, while at the end of the second part of the spring a sealing sleeve is installed to prevent leakage of lubricant, and the first part of the coil spring, made with coils of rectangular cross section with rounded edges, covers a tube of damping material, for example polyurethane, characterized in that the damper is built into the elastic elements of the system and is located axisymmetrically and coaxially inside between the support rings to fix the ends of the springs, the damper is made in the form of a sleeve, inside of which there is a gap with a piston with screw grooves on its surface, and the piston is connected to an axisymmetric rod installed in the sleeve cover, in which the sealing sleeve is fixed, covering the rod, while the over-piston and under-piston cavities of the damper are filled with antifriction grease.

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