218 results about "Magnetic spring" patented technology

The invention provides a novel magnetic mechanical anti-theft lock which comprises a wafer type key, a lock core rotor and a lock shell, and the wafer type key comprises a wafer; at least six magnetic blocks are arranged in the wafer, and the lock core rotor is a T-shaped cylinder on the appearance, and matches with the lock shell in a contacting way; a second magnetic spring blind hole and a magnetic spring are arranged in the position where the lock core rotor corresponds to the magnetic blocks, and the magnetic spring and the corresponding magnetic block are mutually repellent in terms of magnetism; an iron spring is respectively arranged in the position where the lock shell corresponds to the magnetic spring, and part of the iron spring convexly extends to the blind hole of the second magnetic spring; the bottom of the iron spring is also connected with a return spring, and the lock core fixing hole accommodates the narrow part of the lock core rotor. As the lock core of the lock has no key hole, destruction by tools such as a bolt driver, a screwdriver and the like can be prevented; besides, the key of the lock can not be easily duplicated, and the lock has multiple anti-theft functions, elegant appearance, strong invisibility and higher security.

An anti-plugging oscillating shear valve system for generating pressure fluctuations in a flowing drilling fluid comprising a stationary stator and an oscillating rotor, both with axial flow passages. The rotor oscillates in close proximity to the stator, at least partially blocking the flow through the stator and generating oscillating pressure pulses. The rotor passes through two zero speed positions during each cycle, facilitating rapid changes in signal phase, frequency, and/or amplitude facilitating enhanced data encoding. The rotor is driven by a electric motor disposed in a lubricant filled housing. In one embodiment, the housing to shaft seal is a flexible bellows. In one embodiment, a torsional spring is attached to the motor and the resulting spring mass system is designed to be near resonance at the desired pulse frequency. The torsion spring may be a solid torsion bar or a magnetic spring.

A planar reciprocating actuator (PRA) provides a linear motor configured and optimized for small displacement and oscillation, and can use the effect of a designed mechanical or magnetic spring to increase the amplitude of displacement at certain operating points. The PRA is intended to be used in vibrotactile and haptic applications. The PRA can generate various types of vibratory characteristics that may be perceived as distinct and readily user-identifiable haptic stimuli.

The present invention pertains to vibration devices that do not require a rotating mass. In accordance with aspects of the invention, a coil causes a plunger to move linearly. A spring device is coupled to one end of the plunger. Activation of the coil causes the plunger to move in a first direction relative to a body and coil deactivation enables the spring device to move the plunger in an opposite direction relative to the body. Activating the coil at a predetermined frequency causes vibration of the plunger. Vibratory forces are transferred via the spring device and coil onto the body at predetermined locations. Opposing spring devices may be affixed to either end of the plunger. Spring devices may be linear or non-linear. Such spring devices may be used in conjunction with magnetic spring devices. A controller and a driver circuit may be used to control system operation.

A quasi-zero stiffness vibration isolator connected with a magnetic spring in parallel through a spiral spring comprises a mass supporting rod, and one end of the mass supporting rod is fixedly connected with the spiral spring through threads; a permanent magnet clamped by the spiral spring, the spiral spring and the mass supporting rod move together relative to a spiral spring clamping mechanism in the axial direction, and meanwhile the spiral spring provides positive stiffness for a system in the axial direction; two annular permanent magnets fixed through the permanent magnet clamping mechanism apply attraction to the permanent magnet clamped by the spiral spring, the three permanent magnets form the magnetic spring, and non-linear restoration force and non-linear negative stiffness are provided for the system; the relative distances between the upper permanent magnet and the permanent magnet clamped by the spiral spring and between the lower permanent magnet and the permanent magnet clamped by the spiral spring can be adjusted by rotating the permanent magnet clamping mechanism. By means of the vibration isolator, intrinsic frequency of the vibration isolation system can be effectively reduced, and the vibration isolation frequency band is widened. Meanwhile, the damping characteristic of the structure is improved, and a reliable method is provided for low-frequency vibration control.

A magnetic spring arrangement for a resonant motor, comprising: a housing (12), magnets (14, 16) fixed in position at opposing ends (13, 15) of the housing, a magnet (18) positioned within the housing for movement toward and away from the fixed magnets in a reciprocal oscillating motion with a driving action produced by a stator coil (24) and an AC drive signal (26), wherein an applicator member (32) is attachable to the moving magnet for corresponding movement of a workpiece portion (34) of the applicator member.

The invention belongs to the technical field of vibration noise control and energy collection, and relates to a mechanical device integrating the functions of broadband vibration absorption and vibrational energy collection. The mechanical device mainly comprises a baseplate, a nonlinear energy sink mechanism and a vibrational energy collection unit, wherein a buckling beam, the two ends of whichare compressed, and magnetic spring mechanisms arranged at the two sides jointly provide the pure cubic nonlinear stiffness required by the nonlinear energy sink; and the vibrational energy collectionunit mainly comprises an induction coil. The mechanical device can realize the fast, efficient and irreversible transfer of vibrational energy of external mechanical equipment to the non-linear energy sink mechanism in a broadband range, so that the equipment vibration is suppressed; energy absorbed by the non-linear energy sink mechanism can be further dissipated through electromagnetic dampingand is converted into electrical energy for storage, and thus, the dual functions of vibration control and energy collection are realized. The mechanical device has the advantages of wide vibration absorption frequency band, high vibration absorption efficiency, high energy collection efficiency and the like, is simple and compact in structure and has strong applicability.

Embodiments of a spring collar are provided for removably securing a disc weight to the sleeve of a barbell, as are embodiments of a magnetic spring collar attachment and associated methods. In one embodiment, the spring collar includes a resilient wire form having a permanent magnet mounted thereto. The spring collar includes a coiled body having a central aperture, and first and second radial arms extending from the coiled body. The first and second radial arms can be moved toward one another to increase the diameter of the central aperture and permit a user to slide the coiled body over the sleeve. The permanent magnet enables a user to removably secure the spring collar to a ferromagnetic surface when the spring collar is not in use.

The invention discloses a high-speed two-way permanent-magnetic reset proportion electromagnet. A coil framework is coaxially arranged in a shell; three ring grooves are formed in an outer side surface of the framework; a linear hall sensor is adhered in the middle ring groove; electromagnetic coils are reversely wound and connected in series in the ring grooves at two sides of the middle ring groove; one side of the coil framework is fixedly connected with a rear end cover; a cylindrical push rod is coaxially arranged in the coil framework, one end with a rod extends out of the shell of the electromagnet and is in clearance fit with a shell hole of the electromagnet, and an outer permanent magnetic ring is sleeved on the outer side of the other end of the cylindrical push rod; and an inner permanent magnetic ring is coaxially arranged in the cylindrical push rod and is fastened on a small end face of a zero position adjusting screw through a set screw. The inner and outer permanent magnetic rings from a linear magnetic spring, so that the high-speed two-way permanent-magnetic reset proportion electromagnet has a relatively high magnetic spring elasticity modulus, the quality of amovable iron core is reduced, the natural frequency of an electromagnet system is increased, a displacement closed-loop regulating system is formed with an external proportional amplifier through position feedback of the linear hall sensor, and the valve core displacement adjustment accuracy and the system closed-loop bandwidth are improved.

A magnetic spring actuator comprising a ring, a piston movably disposed inside of the ring, and a-non-magnetic holding cylinder. At least one of the ring and the piston is magnetic. Due to a magnetic force caused by at least one of the ring and the piston, the piston is initially located in a first position with respect to the ring. Application of an outside force results in movement of the piston to a second position with respect to the ring. The magnetic force produces a return force for causing the piston to return to the first position with respect to the ring. Alternatively, the piston can be fixed and the ring can be adapted for moving with respect to the piston in a similar manner. A bi-metal coil spring may be wound around the piston.

The invention discloses a quasi-zero stiffness vibration isolator with positive and negative stiffness in parallel connection. The vibration isolator comprises a base, an upper cover, a supporting rod, spiral springs, spacers, an annular iron core, fan-shaped permanent magnet bodies, stators, a permanent magnet body clamping mechanism, working air gaps and a guide plate. The fan-shaped permanent magnet bodies, stators, permanent magnet body clamping mechanism, and working air gaps form a magnetic flow loop, and form magnetic springs with negative magnetic stiffness. The spiral springs are connected with the supporting rod and the upper cover, and initial positive stiffness of the vibration isolator is provided and is in parallel connection with magnetic negative stiffness. The dynamic stiffness of the annular iron core in the equilibrium position is reduced. The guide plate is mounted on the lower portion of the base, and is in sliding-fit with the supporting rod. Compared with an existing quasi-zero stiffness vibration isolator, the vibration isolator has the advantages that load bearing is high, and the mechanism is compact; and as a passive vibration isolator, the vibration isolator can effectively reduce the natural frequency of the vibration isolation system, broaden a vibration isolation frequency band, and has the advantages of easy maintenance and high reliability.

The invention discloses a quasi zero stiffness vibration isolator using multilayer squeezing type magnetic spring and oscillating bars. The vibration isolator comprises a main shaft, guiding shafts, the oscillating bars and a multiplayer structure; the multilayer structure comprises an upper roof arranged from top to bottom in sequence, an upper end cover, a negative stiffness unit, a lower end cover, positive stiffness unit and a bottom plate; the main shaft is a center shaft with multilayer structure; the guiding shafts and the oscillating bars are multiple, and are all arranged around the main shaft at fixing intervals; the structure is compact, and has more bearing ability under relatively small size. In addition, the negative stiffness unit and the positive stiffness unit are connected in parallel by the vibration isolator using the principle of magnetic negative stiffness; the vibration isolator has the characteristics of high static stiffness and low dynamic stiffness, the inherent frequency of the vibration isolator can be efficiently reduced, the vibration isolation frequency band is widened, and the vibration isolator is suitable for low frequency vibration isolation; thenegative stiffness unit is in the form of multilayer squeezing type magnetic spring, the stronger magnetic induction intensity can be produced, the negative stiffness of magnetic spring is increased,the negative stiffness unit is suitable for high loading occasion, and a wide range of applications is met.

The present invention discloses an improved casing assembly for burglar alarm, and the casing comprises an upper casing, a chassis and a front panel; wherein a circuit board and a speaker are included in the upper casing and the chassis and the front panel is covered on the exterior of the upper casing and locked with the chassis by a lock as a whole. The assembly of the forgoing components is connected by the corresponding coupling components on the assembly and thus does not require additional coupling device, which makes the assembly much simpler and quicker and has the advantages of lowering the manufacturing and labor costs. In the meantime, the printed circuit according to the present invention is coupled to a vibration switch or magnetic spring switch as a sensor triggering source for acting as a trigger of the burglar alarm for motor vehicles, portable objects, displayed items, doors and windows, security or display windows. All these burglar alarms can share the same casing and thus can save the cost for manufacturing the molds. The casing can go with a rope having a metal head for passing through, suspending at or fixing onto a wall to give an excellent antitheft protection effect.

A guide having passive gravity compensation via a magnet assembly for guiding a first body relative to a second body in a vertical direction has a spring guide which allows movements between a first and second body in the vertical direction and blocks the same in all other directions. The first body is connected to a first magnet and the second body to a second magnet. The second magnet has an opening within which the first magnet is configured, at least in part, so that a repulsion force, which counteracts the gravity of the first body, acts between the first and the second magnet that are each magnetized parallel to the vertical direction, but oppositely, the positive mechanical stiffness of the spring guide being at least partially compensated by a negative stiffness of the magnetic spring formed by the first and second magnets, and the first and second magnets being shaped such that a horizontal distance between the first and second magnet inside of the opening of the second magnet varies in the vertical direction. A platform supported by such guides is provided.

The invention provides a quasi-zero stiffness vibration isolator based on a magnetic attraction component and a vehicle. The quasi-zero stiffness vibration isolator comprises magnetic spring mechanisms and an air spring; the magnetic spring mechanisms are symmetrically arranged on two sides of the air spring along the axis of the air spring; the magnetic spring mechanisms comprises 3n permanent magnets, and n is a positive integer; the permanent magnets are longitudinally arranged on a guide tube and linearly move along the guide tube, and adjacent permanent magnets are opposite in different stages; the uppermost permanent magnet is connected with one end of the lowermost permanent magnet, the other end of the lowermost permanent magnet is connected with a bottom plate of the air spring; and the middle permanent magnet is connected with an upper end cover plate of the air spring. According to the quasi-zero stiffness vibration isolator, on the premise that the requirement for the quasi-zero rigidity is met, the problems of the large number of parts of the vibration isolator and the large reserved space are solved, and the negative rigidity can be adjusted by adjusting a control coil based on the electromagnetic induction phenomenon.

The invention relates to a magnetic spring structure and a linear compressor structure thereof, in particular relating to a linear compressor with a magnetic spring structure. The linear compressor is characterized in that a magnetic spring assembly is composed of a permanent moving magnet and a permanent stationary magnet, the permanent stationary magnet is fixed on a compressor body, and the permanent moving magnet, a piston and a motor rotor constitutes a piston motion assembly; under the action of alternating thrust of a motor, the piston motion assembly makes a reciprocating linear motion along the axial direction of the motor so as to complete a process comprising the steps of expansion, air suction, compression and air exhaust of the compressor; and meanwhile, under the action of mutual magnetic forces, the permanent moving magnet and the permanent stationary magnet are acted as energy-storage components. The linear compressor with a magnetic spring structure has the advantages that the equivalent stiffness coefficients of the permanent magnets can be changed through changing the diameters, coercive forces and remanence strengths of the permanent magnets; when the compressor is in a large piston stroke, the compressor still has high performances and reliability; and because the magnetic spring is simple in structure, the permanent moving magnet part of the magnetic spring can be inlaid on the piston, so that the structure of the linear compressor is more compact and the volume thereof is smaller.

A electrical socket that provides current overload warning function, includes at least one plug socket; a pair of input terminals, for supplying power to the plug socket after the connection; a magnetic reed relay, which comprises a conductive coil and a dry-reed tube. The said conductive coil is connected in series between one of the two input terminals and the plug socket, and the said dry-reed tube connects an warning apparatus, accordingly when the total consumed current size of one or more loads connected to the plug socket, and flowing through said conductive coil exceeds the operating current value that magnetic red relay sets, the magnetic contact of the dry-reed tube is drived to work and to start the warning apparatus, so as to send the warning immediately.

A quasi-zero stiffness coupling comprises a shell and an inner shaft arranged in the shell. One end of the inner shaft is connected with the bottom of the shell through a rubber spring, and the rubber spring is a tooth-type rubber spring. The inner ring of the rubber spring and teeth at the end of the inner shaft are clamped to each other closely, and the outer ring of the rubber spring and teeth on the inner wall of the shell are clamped to each other closely, so that it is guaranteed that the shell drives the inner shaft to rotate together when twisting. An outer magnetic ring is fixed to the inner wall of the shell, an inner magnetic ring is fixed to the outer circumferential ring of the inner shaft, and the outer magnetic ring and the inner magnetic ring constitute a magnetic spring. The outer ring of the bearing is matched with the shell, the inner ring of the bearing and the inner shaft are matched to restrain the inner shaft from making axial movement and radial movement relative to the shell. The negative stiffness of the outer magnetic ring and the inner magnetic ring are made approximate to the positive stiffness of the rubber spring by selecting geometrical parameters of the outer magnetic ring and the inner magnetic ring, so that the total stiffness is made to reach a quasi-zero state. The quasi-zero stiffness coupling can effectively transmit driving torque, also can isolate disturbance torque, has a wide vibration isolation frequency band, and has a good isolation effect on low-frequency disturbance. The quasi-zero stiffness coupling can be used for solving the torsional vibration problem of a rotor system, and is particularly suitable for precise rotor systems.