Damper

FIELD: mechanics.

SUBSTANCE: invention relates to devices designed to reduce vibration and shock effects, and may be used in designing anti-vibration and anti-shock protection of whatever engineering systems and structures. The damper incorporates a rod, damping elements and plates. The rod is a multi-layer design, the layers featuring different acoustic susceptibility. Every layer is fabricated as a thin-wall cylinder supported by a leg and having a thread made on the cylinder inner surface and the leg outer surface. The damper is provided with tight casing filled with a liquid and fitted on the rod. The damping elements are made in the form of split plates forming the petals, every petal featuring a different intrinsic frequency of elastic oscillations. Higher rigidity of coupling is provided.

EFFECT: higher rigidity of couplings.

2 cl, 3 dwg

 

The invention relates to the field of devices for reducing vibration and shock (shock absorbers) and can be used for designing vibration and shock protection for various technical systems and devices.

Currently, there are various dampers: A.S. USSR №607943, No. 832033, RF patents №2229637, No. 2237793. In the book of Cyril M. Harris, Charles I. creed. "Handbook of shock loads". Leningrad, Sudostroenie, 1980, S. 273-313 presents various schemes of shock absorbers.

The closest (prototype) is a device, see page 305, ri (b), which consists of a rod with nut, damping elements and plates.

A significant drawback of the shock absorber is a significant reduction in stiffness of the connection, which is often one of the main reasons for refusal of absorbers in systems where their use is desirable. For example, protection of SPACECRAFT from vibration and shock with this shock leads to a significant loss of stiffness of the joint SPACECRAFT/rocket and the additional expenditure on mining equipment AC on high vibration and shock.

The proposed solution eliminates the deficiencies noted.

The essence of the invention is to develop a shock absorber containing the rod, the damping elements and p is required, different from the known fact that the bar is laminated with layers of different acoustic compliance with each of the layers is made in the form of a thick-walled cylinder on the leg with threads on the inner surface of the cylinder and the outer surface of the legs and fitted with a sealed casing filled with liquid and mounted on the rod, while the damping elements are made in the form of a split plate with the formation of petals, and each petal is made from various natural frequency of elastic vibrations.

On the petals of the shock absorber advanced wound insulated metal wire that is connected to the power source, and the casing is filled with ferrofluid.

The essence of the claimed solution is illustrated by drawings, where figure 1-3 shows the shock absorber consisting of a laminated core with 1 thread 2. Each layer 3 consists of a part of the rod 1 and the plate 4 and is made in the form of a thick-walled cylinder 5 on the leg 6 with threads on the inner surface of the cylinder 7 and the outer surface of the leg 8. Each layer is made of different materials (with different acoustic compliance). Plate 4 are split with the formation of petals 9, with each petal is made from various natural frequency of elastic vibrations (due to the use of different materials petal is their thickness). Sealed housing 10 is fixed on the rod 1 by thread 2, nuts 11 and washers 12. The housing 10 consists of a cover 13, the Cup 14, which is made of the drain hole 15, the closed tubes 16. The shock absorber is filled with ferrofluid 17. Tightness is ensured with sealing rings 18. On the petals 9 wound insulated wire 19 connected to the power source 20.

Received adjustable shock absorber. The presence of drain holes allows you to replace the fluids with different density and viscosity and to adjust the damping (changing the parameters of the liquid changes the attached weight and, of course, the frequency at which the tuned absorber). The implementation of each layer in the form of a thick-walled cylinder 5 on the leg 6 with threads on the inner diameter of the cylinder 7 and the outer diameter of the leg 8 allows you to build a shock absorber in a single unit.

The operation of the shock absorber is as follows. Shock or vibration impacts (or both the one and the other) is transmitted in the Central part of the absorber 1. Petals 9 are selected so that their natural frequency corresponded to the natural frequencies of external influence, on which stands the main energy.

Wave processes, which rod, cause resonant vibrations of the petals, but since they vary in Vya is some fluid 17, it is quite strong scattering effects. Reflection of waves passing through a boundary with different acoustic compliance as would "delay" effect in the rod and providing additional energy dissipation in the shock absorber. The presence of a large number of petals allow to cover the whole frequency range of external influences.

When passing through the wires of the circuits of various forces on the petals is "sticking" magnetic fluid and thus changing the natural frequencies of the petals. This is especially useful, if at different stages of operation known characteristic (changing) frequency ranges of external influence.

In moments of start and separation speed boosters on unstable regimes appear non-stationary oscillations with elevated levels of impact, the reduction of which will ensure a more comfortable working conditions onboard equipment.

Adjusting the operation of the shock absorber is as follows. At first, the shock absorber due to selection of the stiffness of petals set at the highest possible frequency range of external influences (when the power source).

Before the start of the shock absorber is connected to the power source and adjust the frequency range, coinciding with the lowest frequencies booster.

During the launch through the metal wire electric current is passed, under which around each petal, a magnetic field that interacts with ferrochelatase magnetic fluid and leading to increase its density and viscosity. Increasing the density of the fluid is equivalent to the appearance of added masses of petals, and the increase in mass leads to a decrease in the frequency of natural oscillations of each petal. The increase in the viscosity of the magnetic fluid increases its damping ability.

When splitting the stairs there is a change in current strength and reconfigures absorber on a different frequency range.

The method of calculating the thickness and size of the petals, and application specific types and sizes of wires, types of magnetic fluids refers to "know-how" of the invention and are not further considered. It should only be noted that these calculations can, for example, be carried out with the use of modern packages, finite element modeling (like ANSYS, NASTRAN, and others).

An example of the practical implementation

As an example, consider one of the layers of the shock absorber shown in Fig 1-3. Thick-walled cylinder 5 of the rod 1 is made of aluminum. The outer diameter of the rod 20 mm, inner 5 mm (thread on the inner surface of the cylinder 7 and the outer surface and the legs 8 - M5). Cylinder height 15 mm, the legs 7 mm Thickness 1 mm petal Outer radius of the lobe 90 mm Gap between the petals 2 mm. Magnetic fluid type C-1-20 (density 1200-1300 kg/m3). The thickness of the copper wires of 0.5 mm, length ˜30 m

The natural frequency of oscillation of the petal ˜15 Hz (the highest frequency missiles) when transmitting current was reduced to values ˜6 Hz (the lowest frequency of vibration of the rocket).

The proposed type of shock absorbers may, for example, find application in vibration isolation KA in the ascent phase.

It should be noted that in addition to the rocket and space industry such absorbers can be used, for example, when vibration control of high-precision equipment, where the clash between two conflicting requirements: the maximum rigidity of the base (the base) and equipment insulation from external influences.

From well-known authors of the sources of information and patent materials is not known set of features, similar to the set of features of the declared objects.

1. The absorber containing the rod, the damping elements and plates, characterized in that the bar is laminated with layers of different acoustic compliance with each of the layers is made in the form of a thick-walled cylinder on the leg with threads on the inner surface of the cylinder and the outer surface of the leg and SN is been sealed casing, filled with fluid and mounted on the rod, while the damping elements are made in the form of a split plate with the formation of petals, and each petal is made from various natural frequency of elastic vibrations.

2. The shock absorber according to claim 1, characterized in that on its petals wound insulated metal wire that is connected to the power source, and the casing is filled with ferrofluid.



 

Same patents:

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Vibration absorber // 2047020
The invention relates to the field of engineering, namely to means of protection from vibration of various objects

Damper // 2324090

FIELD: engineering industry.

SUBSTANCE: damper consists of working cylinder in which two-piece piston is placed. Piston parts are rigidly fixed on hollow and continuous rods, accordingly ring and continuous round section, and supplied by channels for pass on them a hydraulic fluid. Both parts of the piston are executed in the form of sleeves, supplied trimmed among themselves by the pair radially located partitions, and rigidly fixed on a hollow rod of ring section. In internal space of sleeves between their radial partitions the mobile lobe is placed. It rigidly connected to a rod of continuous round section. Throttle channels of various diameters are executed in the bottoms of sleeves.

EFFECT: increasing of damping abilities of a damper is reached.

6 dwg

Hydraulic damper // 2324089

FIELD: engineering industry.

SUBSTANCE: hydraulic damper consists of working cylinder in which two-piece piston is movably placed. Piston parts are rigidly fixed on hollow and continuous rods of ring and continuous round section, and supplied by channels for hydraulic fluid transiting. In the lower part of a continuous rod the channel is executed. This channel is linked, at least with two open coaxial holes located in its diametrical plane. Walls of a hollow rod lay in a horizontal plane of these holes, and are supplied with open slots varying on height of rods. Each of slots is directed on an external and internal generatrix of a hollow rod to each other by the ends having their least height.

EFFECT: operational efficiency upgrading of a damper due to improvement of its damping performances.

2 dwg

FIELD: engineering industry.

SUBSTANCE: suppressor of oscillations, mainly of rail crews, consists of working cylinder in which the piston is movably placed. Piston consists of two parts fixed on hollow and continuous rods of ring and round section. Piston parts are supplied on the surfaces by radial edges and protuberances with the channels bent under a right angle. Radial edges are movably placed in a vertical plane of a suppressor in corresponding slots. Slots are executed on external surfaces of each of piston parts. Edges are spring-bias concerning slots by springs of the compression having various magnitude of linear rigidity. The maximum course of edges is equal to height of the protuberances supplied with channels bent under a right angle.

EFFECT: operation possibilities increasing of hydraulic suppressors of oscillations.

2 dwg

Hydraulic damper // 2324087

FIELD: engineering industry.

SUBSTANCE: damper consists of the working cylinder in which the two-piece piston is movably placed. Piston parts are rigidly fixed on hollow and continuous rods of round section and supplied on the surfaces by radial edges and protuberances with bent under a right angle to a horizontal and vertical plane of the piston channels. Surfaces of the radial edges converted to horizontal sites of channels, are executed in the curvilinear shape. Symmetry direct-axes are located in the lower part of curvilinear surfaces of radial edges in a place of their adjunction to piston parts. Face surfaces of protuberances have the curvature that is adequate to curvilinear surfaces of edges.

EFFECT: increasing of a torque; deriving of better performances of the oscillations damping.

2 dwg

FIELD: transport engineering; suspensions.

SUBSTANCE: invention relates to pneumohydraulic springs with self-adjustable hydraulic resistance depending on amplitude and frequency of oscillations. Proposed pneumohydraulic spring of vehicle suspension contains cylinder with fitted-in piston and rod forming in cylinder piston and rod spaces, and hydraulic accumulator connected with cylinder space through valve. Valve is made in form of damping unit self-adjustable in amplitude and frequency of oscillations depending on pressure in spring and its change in time. Channel is made in valve body which accommodates spring-loaded step plunger forming with valve body, overplunger space, underplunger space and ring plunger space communicating with piston space and connected with space of hydraulic accumulator through main throttling channel with higher resistance and additional throttling channel with lower resistance, overlapped by larger step of plunger in extreme upper position. Spring installed in overplunger space engages with smaller step of plunger. Check valve installed in larger step of plunger connects ring plunger space with under plunger space. Outer groove made on lower part of plunger larger step communicates with ring plunger space through longitudinal throttling slot made on outer surface of plunger larger step, and with underplunger space through radial holes and filter installed in outer groove. Invention provides new damping system automatically self-adjustable in amplitude and oscillation frequency depending on pressure in spring and its changes in time and increase in damping force with rise of amplitude of oscillations over travel of suspension at any frequencies of road actions.

EFFECT: improved smoothness at any frequencies of road actions when riding practically along roads of any type.

1 dwg

FIELD: oil and gas-condensate well development and repair, particularly to increase oil recovery from oil and gas-condensate reservoirs during oil-production well operation by deep overburden creation in well bottom zone.

SUBSTANCE: pressure generator comprises shutoff pipeline with reservoir fluid pressure inlet orifices, implosion chamber cylinder connected with shutoff pipeline by means of sub, piston connected with pump rod and working chamber. The working chamber has working cylinder with windows and pressure concentrators, shutoff valve with rod and sleeve, which communicates implosion chamber cylinder with working chamber. Working chamber has air-hydraulic damping means including hydraulic cylinder with expanded upper part and including piston. Air-hydraulic damping mans also has pneumatic cylinder with floating piston. Piston is made as a single whole with shutoff valve rod. Floating piston is at predetermined pressure and may cooperate with shutoff valve rod. Hydraulic and pneumatic cylinders are fixedly connected with each other.

EFFECT: increased pressure generator operational reliability.

2 cl, 2 dwg

Hydraulic damper // 2317456

FIELD: mechanical engineering.

SUBSTANCE: hydraulic damper comprises cylinder that receives interconnected flexible rod and piston. The piston is provided with the passages curved at the right angle and radial ribs. The flexible rod is hollow, and the piston is mounted on the flexible rod for permitting movement and is spring-loaded with respect to it by a compression spring. The joining pin is rigidly connected with the face of the piston. The end of the pin is provided with splains that cooperate with the answered splains made in the inner generatrix of the surface of the flexible rod.

EFFECT: enhanced damping capabilities.

2 dwg

FIELD: automotive industry.

SUBSTANCE: controlled hydraulic shock absorber comprises telescopic hydraulic two-tube shock absorber. The rod of the shock absorber is made of a hollow rod provided with the flange having a groove for roller thrust bearing and vertical slots from the other side. The hollow of the rod receives the hollow rod of by-pass valve for permitting vertical movement. The top section of the rod is provided with trapezium right thread, and the bottom section is provided with the stop for the spring of the valve. The driven pinion is screwed on the threaded part of the rod of the by-pass valve. The bottom of the driven pinion abuts against the roller thrust bearing that is mounted in the groove in the flange of the hollow rod. The second driven pinion is screwed on the threaded part of the valve rod. The top side of the pinion abuts against the roller thrust bearing. The third roller thrust bearing is interposed between the driven pinions. The driven pinions engage the driving gears mounted on the shaft of the electric motor. The control unit is connected with the electric motor and receives the signal from the pickups of suspension vibration and velocity pickup.

EFFECT: improved shock absorbing.

FIELD: equipment for oil and gas condensate well development and repair, particularly to increase oil recovery from oil and gas condensate reservoirs during production oil well operation by creation of deeply penetrating repressions in well bottom zone.

SUBSTANCE: hydraulic generator comprises intake pipeline with orifices for well fluid reservoir pressure supply, implosion chamber cylinder, sub connecting intake pipeline with implosion chamber cylinder, piston connected with sucker rod, working chamber including working cylinder with windows and pressure concentrators, shutoff valve having rod and shutoff valve clutch, which connects implosion chamber cylinder with working chamber and cylindrical compression spring. Working chamber has hydraulic damping means. Damping means comprises cylinder with bypass orifices, piston made as a single whole with shutoff valve rod and spring-loaded with cylindrical compression spring, and collar having rigid spring-loaded stop. The stop may cooperate with shutoff valve rod to prevent critical cylindrical compression spring deformation.

EFFECT: increased reliability of hydraulic generator operation.

2 cl, 2 dwg

FIELD: mechanical engineering; transport engineering.

SUBSTANCE: invention relates to hydraulic vibration-isolating bases used for damping vibrations created by operating power units of vehicles. Proposed vibration-isolating base has liquid-filled working and compensating chambers 1 and 8 limited by housing 7 with fitted-in dividing partition 6 provided with ring space 12 and restriction channels 4 communicating ring space 12 with said chambers 1, 8. Working chamber 1 is limited by support plate 3 with displacer 13 and elastic shell 2, and compensating chamber 8 by elastic diaphragm 9. Restriction channels 4 adjoin tangentially ring space 12 and working and compensating chambers 1, 8 Diffuser channels 5 are made in middle part of dividing partition 6 to communicate working and compensating chambers 1, 8. Peripheral part 8b of compensating chamber 8 is torous-shaped, tangentially adjoining diffuser channels 5. Dividing partition 6 is provided with axial channel 14 whose inner surface is made conical, with cut screw groove. Vertex of cone is pointed to side of support plate 3. Elastic element 15 is arranged between pan 11 and elastic diaphragm 9. Rigidity of elastic element is equal to rigidity of pneumatic spring formed by air space 10.

EFFECT: improved damping characteristics of vibration-isolating base, increased dissipation of vibration energy.

4 dwg

Damper // 2313012

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

FIELD: mechanical engineering.

SUBSTANCE: to provide vibration of isolation of mobile processing machines, object to be protected from vibration is connected with vibration source through vibration isolators. Said vibration isolators contain flexible members of different rigidly connected to each other. To provide operation of machine under traveling of operating conditions, scheme of connection of flexible members and common reduced rigidity of vibration isolators are changed by removing or restoring rigid couplings between flexible members.

EFFECT: reduced vibrations of cabin (body) of mobile processing machine operating under stationary conditions and at transportation, (under traveling conditions).

3 dwg

FIELD: mechanical engineering.

SUBSTANCE: fluid-operated shock absorber comprises intermediate mass with flexible link made on high-pressure hoses. The intermediate mass is mounted on the high-pressure hoses connected with the vibration damper. The vibration damper has check valve and controlled throttle connected in parallel with the fluid accumulator.

EFFECT: expanded functional capabilities.

2 dwg

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

FIELD: mechanical engineering.

SUBSTANCE: vibration insulated base comprises frame, pad that is a bearing surface for the operator, and flexible members that connect the frame with the base. The flexible members are made of a stack of flexible plate members composed of flexible plate members connected in series. The inner side of the members cooperates with the bushing coaxially mounted under the members. One end of the bushing is secured to the base, and the other end cooperates with the inner side of the lid made of an overturned sleeve. The face of the lid cooperates with the flexible plate members. There is a space between the face of the bushing and the bottom of the lid.

EFFECT: improved vibration insulation and simplified structure .

2 cl, 7 dwg

Damping unit // 2292500

FIELD: mechanical engineering.

SUBSTANCE: damping unit comprises housing with a space filled with viscous liquid and movable vertical member submerged in the liquid. The top section of the movable member receives pivot for the end of the rotor shaft and ends of the centering springs. The other ends of the centering springs are secured to the housing. The bottom section of the movable member is mounted on the pivot of the flexible diaphragm whose periphery is secured to the housing. The damping member is connected to the diaphragm and interposed between the diaphragm and bottom of the space.

EFFECT: expanded frequency band of damping.

12 cl, 2 dwg

Damping unit // 2292499

FIELD: mechanical engineering.

SUBSTANCE: damping unit comprises main damper and additional damper. The main damper is provided with movable member having bearing for the flexible support of the rotor and centering springs mounted in the top section. The damper is pivotally mounted in the tank filled with damping fluid. The additional damper has damping step cylinder whose bottom section of greater diameter is mounted in the space filled with damping fluid, and top section of smaller diameter receives the adjusting ring that embraces the semiaxle of the flexible support with a spaced relation. The damping cylinder is suspended in the space by means of additional centering springs secured to the top section of smaller diameter.

EFFECT: enhanced damping.

19 cl, 12 dwg

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