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Dashpot damping applications fall into one of the following generic categories: Velocity Control of Solenoids, Spring Loaded Mechanisms, Falling Mass, Creating Time Delay, Vibration Damping, Valve Damping, Limiting Overaction, or Cushioning Impact. At rest, the dashpot is a passive device and has no force output. In motion, the dashpot offers a resisting force which rises to equal the force of the input load, achieving a zero net force. This results in zero acceleration and constant velocity. Force limits of Airpot dashpots are determined by the direction of damping and the diameter of the piston. In pull damping units, a vacuum is being created in the dashpot as the piston moves outward. Thus, the maximum resisting force limit of the unit is a direct function of atmospheric pressure and the area of the piston (F=PA) Assuming an equal ambient pressure, larger diameter units will have force limits higher than smaller diameter units; the limits being directly proportional to their piston areas. In the push damping (compression) direction, air must be compressed into an ever decreasing space; the force can rise to a level which is higher than is possible in the pull damping direction. Precision Dashpots from Airpot are available in standard or custom designed configurations, depending on your application. Airpot dashpots unique combination of materials, combined with the precision of the parts and their close fits, provides ultra low friction, immediate response and long life without seals or lubricants, even under extreme temperatures, high speed operation, or long periods of non-use.
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Based on decades of experience in design and application of VISCODAMPERS® for vibration control of machinery and other industrial equipment, GERB has developed Pipework dampers for the protection of piping systems.
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STAB-O-SHOC
Function of a Damper
The damper is a hydraulic damping element and consists of a pressure tube with a connection fitting, a piston rod with piston system and a piston rod connection fitting. The piston rod is mounted in a special seal-guide system in the pressure tube. The piston rod in the pressure tube features a damping piston and the related valve system. The movement of the piston displaces the filling medium (oil), which is pressed through the valve system and thus produces the damping force.
Dampers are needed to influence the nature of movements and vibrations. Dampers are designed to optimally match the particular application.
Vibration dampening for steering systems, engines, automatic trailer brakes, washing machines, seats, two-wheelers and other applications.
Vibration damper with separating piston for positionally independent installation. Available with an internal valve for compensation of high compression forces. Frequency-dependent dampers for dampening only selected areas of vibration.
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Talleres Egaña is still improving by innovation and research. That can explain the appearing of new products and materials such as polyurethane, which is a complementary element to rubber and brings a new conception to the antivibration market.
The wide range of Egaña products is increasing step by step and their products are used in Machinery (lathes, presses, plastic injectors, shears, guillotines...), Compressors, Groups, Air conditionning and in many other sectors of Industry in general.
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Versatile vibration isolator as the last resort:
1. Low frequency and micro vibration in particular:
Alpha gel vibration isolators cover a wide range of loads from 0.2kg to 300kg. Alpha gel isolators excel in dampening low frequency/micro vibrations & noise in particular, usually not eliminated by other materials such as rubber. That is why they were brought to space in the Space Shuttle. They are proven to work nicely for over 2 decades on the globe too...
2. Alpha gel brand:
Alpha gel is the umbrella brand for the patented, multifunctional silicone gel from Taica Corp (formerly Geltec) in Japan. For over 20 years, its softness has established unique and distinct position in vibration isolation, shock absorption, thermal conductivity, and a comfortable feel in ways traditional solutions have fallen short.
(a) Wide operating temperature:-40 to 200 C (-40 to 392 F)
(b) Low compression set (not much deformed over time)
(c) Long-term durability
(d) Friendly to the environment and sustainable even in severe environments
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The VIBROSTOP METALFLEX is a most widely appreciated damper, due to its versatility and its wide range of available sizes: it's fit for applications where the elastic bond must be of reduced size, while able to resist to compression, shear and torsion.
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LASTO ISOBLOCK reduces vibrations from train and road traffic. The parallel swinging masses and the stiffness of the bearings lead to a lower frequency of the object than the interfering frequency, which provides an ideal insulation effect.
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Heat Shield Isolators & Vibration Dampeners
ACS Industries, Inc.’s patent pending single-rivet heat shield isolator and production process are revolutionizing isolating and vibration dampening technology. A significant improvement over existing assemblies, this innovative design eliminates multiple-piece constructions and the costly assembly process that accompanies them.
Based on existing heat shield isolator and vibration dampener technology, our single-rivet isolators function similarly to other such elements. By reducing resident frequencies the materials they support, they reduce the noise these waves produce. Manufactured from wire types specifically matched to operating requirements, these compressed mesh elements can be engineered to survive hostile environmental factors such as temperature extremes or corrosive agents.
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As a result of its interlocking loop construction-which couples resiliency with high damping characteristics and nonlinear spring rates-Metex knitted wire mesh offers unique properties for absorbing shock and vibration. Each loop acts as a small spring when subjected to compressive loads, and will immediately resume 90% of its original shape when the load is removed.
Knitted wire mesh can be used to provide mechanical support for the monolith element used in an exhaust system's catalytic converter. The wire mesh is used to support the monolith, compensate for the wide range of thermal expansion rates and protect the fragile ceramic honeycomb from the mechanical shocks associated with various driving conditions.
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Motion Control/Bumpers/Feet
Richco’s range of rotary and axis dampers provide the white goods, audio & video entertainment, automotive and general electronics industries with a solution to dampening and providing controlled movement to give added value and functionality to the end user. Richco’s rotary and axis dampers are available in different torques and mounting methods such as screw or snap-in mount.
Richco also provides door latches that act as a ‘push/pull’ locking and unlocking device enabling the door/compartment of your application to be securely closed and opened. Our door latch range also consists of a spring-assisted version.
Richco also supplies a number of molded rubber bumpers and rivet-fastened push-on feet for dampening or for taking light shock absorption on moving parts. Richco’s bumpers and feet also secure and resist movement of your application when it is at rest. They also prevent surface damage with their anti-skid, scratch and stain/mark resistance properties. Richco’s bumpers and feet come in different shapes, sizes, colours, hardness ratings and materials. If you cannot find a specific product in this section or require further technical details, please contact your local Richco office.
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Versatile vibration isolator as the last resort
1. Low frequency and micro vibration in particular:
Alpha gel vibration isolators cover a wide range of loads from 0.2kg to 300kg. Alpha gel isolators excel in dampening low frequency/micro vibrations & noise in particular, usually not eliminated by other materials such as rubber. That is why they were brought to space in the Space Shuttle. They are proven to work nicely for over 2 decades on the globe too...
2. Alpha gel brand:
Alpha gel is the umbrella brand for the patented, multifunctional silicone gel from Taica Corp (formerly Geltec) in Japan. For over 20 years, its softness has established unique and distinct position in vibration isolation, shock absorption, thermal conductivity, and a comfortable feel in ways traditional solutions have fallen short.
(a) Wide operating temperature:-40 to 200 C (-40 to 392 F)
(b) Low compression set (not much deformed over time)
(c) Long-term durability
(d) Friendly to the environment and sustainable even in severe
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Alpha GEL tape, chip, and form.
thickness 1-10mm
Alpha GEL's softness and high performance have often helped to protect from shock and vibration, senstive devices in electronics such as hard disc.
1) Alpha GEL tape/chip
* Simply cut (tape) or remove (chip) from the liner with adhesive one one side.
* Wide selection to choose from based on width and thickness.
* Very easy and effective solution for shock absorption and vibration damping
where no space is allowed for insulators or bushes.
* Wide temperature range from -40C (104F) to 100C (212F).
2) Alpha GEL NP foam (not in the picture)
* Lightweight and highly durable foam type Alpha GEL.
* Low compression set, highly flame retardant, resistant to weather and ozone.
* Operable from -40C (104F) to 200C (392F)and sustainable over a long haul.
* http://www.geltec.co.jp/english//product/pro_05.htm.
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Dampeners
Dampening - Absorbing shock - Protecting
Musthane dampeners are designed to absorb violent shocks. They are made of a composite matrix positioned in a highly resistant and flexible skin. They are reusable, easily set-up and compact.
They can also be an excellent means to absorb vibrations.
The Mustshock range offers low, medium and high pressure dampeners, with an innovative technique which is protected by a joint patent with the THALES group.
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Range of movement and vibration dampeners enriched at Norelem
Family 26000 of Norelem gathers a whole range of new vibration dampeners and movements dedicated to the pneumatic applications.
References 26100,26110 and 26115 are elastomer shock absorbers tolerating of the temperatures of -30° with +50°; they absorb the shocks and their different forms conical, cylindrical, in warhead adapt to any type of construction of special machines, for which they are particularly advised. Norelem also proposes under reference 26300 of the hydraulic dampers. Loan to be gone up and not requiring any maintenance, they resist temperatures of -5° with +70°. Their threaded body allows a precise adjustment of damping. Available of M8 to m2.
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AirLoc pads are designed to be homogeneous and are suited for a wide range of applications. 99% of all problems with vibrations, structure-borne sound and machine installation can be solved with the AirLoc system, which features:
a high degree of isolation efficiency
high damping and load-bearing capacity
level stability
a high coefficient of friction
homogeneous materials
high strength and good aging characteristics
BiLoc pads with unique profiles were specifically developed for low-frequency applications. They feature:
low natural frequencies
high coefficient of friction
long life
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Sunnex SP Series Damping Pads
Sunnex SP-Series machine pads are used in many areas of industry to insulate machinery against the adverse effects of impact, vibration, structure borne noise, or simply to prevent slipping.
Advantages:
Easily designed to meet thickness and shape requirements
High resistance to grease, acid, oil, and cooling emulsions
Significantly reduces vibration
Easily sized for different configurations
Unique cell design offsets pad deflection
Applications:
Engines
Motors
Pumps
Compressors
Generators
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Machines generate vibrations which are transmitted to the surroundings.
They can influence the manufacturing process of other machines and thereby the quality of the products.
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UNISORB® Vibration Isolation Pad Materials
Reduced vibration contributes to more efficient operation and longer life of costly machinery. UNISORB's job engineered isolation pads substantially reduce vibration and noise transmission. Installations are fast, easy and inexpensive.
Harmful effects of vibration and noise may cause serious impairment to the efficiency of workers and the overall effectiveness of production machinery. Proper use of these products will:
- Improve the efficiency of production equipment
- Provide a safer, more desirable environment for workers
- Reduce down time and extend the operating life of machinery
- Prevent floor damage
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Fabreeka® resilient laminated fabric pad is a scientifically designed and manufactured material composed of layers of tightly twisted, closely woven lightweight duck. Each layer is impregnated with an elastomeric compound containing mold and mildew inhibiting agents. The properties of Fabreeka® are exceptionally suited for the reduction of impact shock, vibration and structure-borne noise.
Some features and benefits of Fabreeka® pads:
- Do not have a shape factor
- Exhibit relatively high damping (C/Cc -.14)
- Creep effects are reduced to a limit of 5% of original thickness
- Operating temperature limits are -65°F (-55°C) to 200°F (95°C)
- Unusually high compressive strength - 12,000 psi
- Impervious to most oils and solvents
- Resist effects of steam, water, mildew and brine
- Can be supplied in nominal thicknesses of 1/16" (1.6 mm) up to 1" (25.4 mm)
- Thicker sections can be supplied by bonding standard thicknesses together
- Can be custom fabricated to any shape or size (see OEM section for samples of fabricated parts)
Some practical aspects and considerations when using Fabreeka® pads:
- Provides stability and limited motion
- Should be used with rigid support for best performance
- Connections to isolated system should be made flexible
- Avoid metal-to-metal contact in mount attachments by including Fabreeka® Bushings and Washers
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The AV Plate, made of oil and grease resistant rubber material, is available either as a single (4.5mm) or as a double (8mm) version. The single version has ribs on one side only, while the double has ribs on both sides applied at a 90 degree angle to each other.
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