55results about How to "Reduce axial stiffness" patented technology

A premium threaded tubular connection including, on at least one threaded element, a distal abutment surface at the free end of a threaded element, and a lip sealing surface at a given distance from the threading. The lip includes an appendix that extends the lip towards its free end beyond the lip sealing surface so that the lip has both high radial stiffness and low axial stiffness. This results in enhanced performance as regards the seal of the threaded connection under pressure and / or under tension, and other advantages of precision of real makeup torque, mechanical strength in axial compression, a shock barrier effect, and tolerance in engaging the threaded elements.

The invention relates to a centrifugal pump, especially for blood, comprising a pump rotor which is arranged in a rotational manner and without a bearing in a liquid-tight and gas-tight closed housing, except for at least one inlet opening and at least one outlet opening. The rotor is also the rotor of a drive motor. The rotor is symmetrical with respect to the centre plane thereof and comprises an upper and a lower covering. The rotor and / or the pump housing are formed in such a way that the axial distances between the upper and the lower coverings and the upper and lower housing walls are smaller in the radially inner region of the rotor than in the radially outer region. In the radially inner region of the rotor, each lateral rotor chamber comprises a flow-restrictor gap which, when in operation, influences back flows oriented in a radially inward manner in the lateral rotor chambers, such that during an axial deflection of the rotor above and below the rotor, various pressure distributions appear, enabling forces acting upon the predominant surface of the coverings to be produced, the forces bringing about an axial stabilisation of the rotor and acting, in the same manner, against tilting of the rotor inside the housing.

A valve seat has an outer surface, a rearward end, a face and a forward end. A passage extends from the rearward end to the face. A valve element slidingly contacts the face. Stress relief flanges are located on the face in areas of high bearing stress. Each flange has a thickness that allows it to deflect slightly to reduce bearing stresses.

A connecting member for the electrically conductive connection of two components, having a (first) conductor which comprises a tubular shell which has at least one opening to reduce axial stiffness.

The invention relates to a primary mirror mounting regulating mechanism. The problems that the existing telescope primary mirror is complicated in regulating mode and bad in stability, and has the axial and radial intercoupling are solved. A reflecting mirror is adhered on three support lug bosses on a bearing seat; a primary mirror chamber and the bearing seat are concentrically arranged; an adjusting component comprises a primary mirror chamber insert inlaid on the primary mirror chamber, a stacking ball socket inlaid on the bottom of the bearing seat, an adjusting screw arranged in the primary mirror chamber insert, a screw ball socket inlaid on the upper end part of the adjusting screw, a steel ball arranged between the stacking ball socket and the screw ball socket, and a lock nut mounted on the bottom of the adjusting screw; a lock component comprises a roller inlaid on the bearing seat, a wane mounted on the roller, a lock ball, and a lock ball socket which are mounted on a lock bolt, and a butterfly-shaped gasket. The mechanism disclosed by the invention can adjust the primary mirror with three degrees of freedom without influencing the shape of the primary mirror plane.

The invention provides a composite spring damping adjustable vibration isolator. The composite spring damping adjustable vibration isolator comprises a shell provided with an opening at the upper end, a bottom plate is arranged below the shell, a connecting shaft is arranged in the shell, the upper end of the connecting shaft is capable extending out of the opening of the shell; a shaft shoulder is arranged at the middle part of the connecting shaft, a first belleville spring, an upper metal wire net pad and a baffle plate are sequentially arranged between the upper surface of the shaft shoulder and the top wall of the shell from the bottom to the top, the upper surface of the baffle plate is fitted with the top wall of the shell, a second belleville spring and a lower metal wire net pad are sequentially arranged between the lower surface of the shaft shoulder of the connecting shaft and the bottom plate from top to the bottom, and the bottom surface of the lower metal wire pad is fitted with the bottom plate; the lower end of the connecting shaft is provided with an inner bore, and a spiral spring is arranged in the inner bore; and a lining is arranged between the outer diameter of the spiral spring and the pore wall of the connecting shaft. The vibration isolation performances in three axial directions of the vibration isolator are less in difference, the damping can be independently adjusted, the vibration isolation performance and the performance stability are improved, and the use range of the vibration isolator is expanded.

The invention discloses a push-type displacement feedback pneumatic deviation correction mechanism of a vibrating platform used under a centrifugal environment. The mechanism comprises a platform push rod and a deviation correction push rod which are symmetrically arranged at the two ends of the vibrating platform, wherein the platform push rod is in linkage with a vibrating platform moving component which drives the vibrating platform to do reciprocating motion; the deviation correction push rod is in linkage with a deviation correction mechanism; the deviation correction mechanism comprises a partition plate, a closed high pressure chamber, a low pressure chamber and a displacement sensor; the partition plate is fixedly connected with the deviation correction push rod; the high pressure chamber and the low pressure chamber are positioned on the two sides of the partition plate respectively; the low pressure chamber is communicated with the atmosphere; the displacement sensor is positioned on the high pressure chamber opposite to the partition plate so as to monitor the displacement of the deviation correction push rod; an output signal of the displacement sensor is input to a controller; the high pressure chamber is provided with an air inlet and an air outlet; a charging electromagnetic valve and a discharging electromagnetic valve are controlled by the controller; the high pressure chamber is fixedly connected with the low pressure chamber; a high pressure cavity of the high pressure chamber interacts with a low pressure cavity of the low pressure chamber through the partition plate; and the partition plate is hermetically connected with the high pressure chamber through an annular sealing film. The mechanism has the advantages of directly applying the vibrating platform to the centrifugal environment.

The invention discloses a double-yield-point buckling restrained brace. The brace comprises a body, the body comprises a core unit, an outer restraining unit, an unbonded sliding mechanism unit and connecting units at the two ends, the core unit comprises a staged yield composition plate, the staged yield composition plate comprises a first yield steel plate and a second yield steel plate, and the outer restraining unit comprises an outer steel pipe and filler. The unbonded sliding mechanism unit is arranged between the core unit and the filler, and the connecting units are fixedly connected to the outer sides of a first connecting section and a second connecting section of a connecting area. According to the buckling restrained brace with the two yield sections, the buckling restrained brace has two yield points through construction, yield energy consumption can be achieved under small earthquakes, along with increase of earthquake action and increase of structural deformation, when medium earthquakes or large earthquakes are reached, the second yield section enters a working state, and the requirement of structural anti-seismic performance design is well met.

The invention provides a package member for packing a flexible member, in particular wiper rubber bars of a wiper. The package device comprises a movable conveying device, a supplying device, a blocking device which can be lifted or lowered from a place above the surface of the conveying device to block the flexible member, a pushing device enabling the flexible member to move along the conveying direction, and a grabbing device for grabbing the flexible member form the conveying device and pulling into the package.

A connecting member for the electrically conductive connection of two components, having a (first) conductor which comprises a tubular shell which has at least one opening to reduce axial stiffness.

The invention relates to a finger tip sealing device, which comprises a front baffle plate (1) and a rear baffle plate (2) with circular structures and a plurality of finger tip sheets (3) arranged between the front and rear baffle plate; wherein, a finger body (6) with clearing is provided from the internal diameter part of the finger tip sheet and finger bodies (6) between two adjacent finger tip sheets (3) are staggered from each other; wherein, a flexible constrictor (4) with circular structure is arranged between the front baffle plate (1) and the finger tip sheet (3) and the internal diameter of the flexible constrictor (4) is consistent with the rear baffle plate (2) and a plurality of cut grooves (5) are provided along the direction of the internal diameter. Equipped with the flexible constrictor, the finger tip sealing device of the invention can effectively eliminate the axial bending deformation of the finger bodies of the finger tip sheets so as to increase the sealing performance of the finger tip sealing device, and is characterized by simple structure and convenient processing and has larger economic values.

Apparatus and method for delivering and deploying an intravascular device into the vessel including an outer and inner tube that are axially linked by a housing structure at the proximal end of the catheter, and a retractable sleeve structure having a middle tube and sleeve tip. The sleeve tip is sealed to the inner tube at the distal end, and continuously extends into the middle tube. At the proximal end of the sleeve structure, the middle tube is sealed to either a housing structure or slideable proximal ring, forming a sealed chamber between the inner tube and the sleeve structure. A radial space is formed between the sleeve tip and the inner tube optimized for intravascular device placement. During retraction of the sleeve structure, the fold of the sleeve tip peels away from the device, which expands to its deployed state while minimizing axial forces and friction.

The invention discloses a piston for pressure balance, which is characterized in that the piston is a cylindrical tube piece with one end closed, the side wall of the longitudinal section of the cylindrical tube piece along the axle line is a V-shaped corrugated surface; the outer side wall and the inner side wall of the V-shaped corrugated surface have the same corrugation shape and the outer side wall is at the same level with the inner side wall along the radial direction. By utilizing the pressure balance, the piston of the invention can have the reliable sealing performance under the pressure in the deep sea and maintain the flexible movement of the piston.

A bellows having a substructure including a first end and a second end, the ends being movable relative to one another, circumferential bulges, which are spaced apart by first constricted regions, being formed in the substructure between the ends, and a second constricted region being formed in at least one bulge. The width of the second constricted region corresponds at least to its height in order to reduce the axial stiffness and increase the radial stiffness.

The invention discloses a viscous fluid damper for the on-orbit vibration isolation of a spatial load, and belongs to the technical field of space optics. The technical problems of difficulty in sealing, low flexural rigidity, poor environmental adaptability, insensitivity to spatial micro vibration and inconsistency between performance under a spatial zero-gravity condition and performance on the ground in the prior art are solved. A wave spring piece I is fixedly connected to the top end of an intermediate shaft through a damping screw I, wherein an upper oil cavity is formed between the wave spring piece I and an end cover; the wave spring piece I is sealed with the upper oil cavity through an O-shaped sealing ring I1, and is sealed with the upper end of the intermediate shaft through an O-shaped sealing ring I2; a wave spring piece II is fixedly connected to the bottom end of the intermediate shaft through a damping screw II; a lower oil cavity is formed between the wave spring piece II and a base; the wave spring piece II is sealed with the lower oil cavity through an O-shaped sealing ring II1, and is sealed with the bottom end of the intermediate shaft through an O-shaped sealing ring II2.

The invention provides an eddy current damper with an axial double-reed structure. The eddy current damper comprises a permanent magnet, wherein the permanent magnet is mounted in a housing; a coil is mounted and fixed on a bracket around the permanent magnet and moves relative to the housing in the axial direction to form a main eddy current; and a damping coefficient adjusting device is arranged on the housing and electrically connected with a series coil. The eddy current damper can adapt to vibration with different frequencies and amplitudes generated by influence of other factors in precision equipment, and the optimal shock insulation effect is achieved; a lead-out wire in a copper coil is led out to a damping coefficient adjusting module outside the housing, so that the damping coefficient is adjusted quickly; the eddy current damper has the advantages of high radial rigidity and low axial rigidity, and different overall rigidity can be obtained by adjusting the thickness and the shape of reeds; a special locking mechanism is designed between a front end cover and a shaft, so that the reliability of a non-working state is guaranteed; and based on limiting mechanisms such as a base, the front end cover and a movable shaft, the effective working range is guaranteed.

The invention discloses a four-leaf aberration deformation mirror device which belongs to the field of system aberration compensation of optical systems and aims at solving the problems that the mounting and the detection are difficult to perform and the moving rigid body displacement is large in the prior art. The device comprises an optical element, a deformable mirror frame, eight actuators, eight displacement sensors, an upper fixed plate and a lower fixed plate, wherein the optical element and the deformable mirror frame are connected to form a mirror frame component in an adhesion or compression mode; the upper fixed plate and the lower fixed plate are respectively fixed on the deformable mirror frame through screws; four actuators which are distributed at an angle of 90 degrees in the circumferential direction are arranged on the upper fixed plate; four actuators which are distributed at an angle of 90 degrees in the circumferential direction are arranged on the lower fixed plate; the eight actuators on the upper fixed plate and the lower fixed plate are distributed at an angle of 45 degrees; the actuators are arranged along the optical axis of the optical element; input displacement vertically acts on the deformable mirror frame; the eight displacement sensors are respectively arranged on the upper fixed plate and the lower fixed plate and are opposite to the eight actuators.

A method of manufacturing a composite structural member (1), comprising the step of laying up a stack of fiber reinforced laminate plies (12), wherein at least one of the plies is laid up as discrete first (13) and second ply (14) portions, and the fibers of the second portion (14) have a different characteristic from those of the first portion (13). Also, a composite structural member (1) manufactured according to the method.

The invention relates to an astigmatic deformable mirror device, which belongs to the field of system aberration compensation of an optical system and aims to solve the problems of difficulty in processing and manufacturing and large displacement of an introduced rigid body in the prior art. The astigmatic deformable mirror device comprises an optical element, a deformable mirror frame, four actuators, four displacement sensors, an upper fixed plate and a lower fixed plate, wherein the optical element and the deformable mirror frame are connected into a mirror frame assembly in a gluing or compressing mode; the upper fixed plate and the lower fixed plate are fixed on the deformable mirror frame respectively by screws; two actuators which are circumferentially distributed in 180 degrees are arranged on the upper fixed plate, the other two actuators which are circumferentially distributed in 180 degrees are arranged on the lower fixed plate, the four actuators on the upper fixed plate and the lower fixed plate are circumferentially distributed in 90 degrees, the actuators are arranged along the direction of an optical axis of the optical element, and input displacements vertically act on the deformable mirror frame; and the four displacement sensors are respectively arranged on the upper fixed plate and the lower fixed plate and are opposite to the four actuators.

The invention relates to a non-contact centering mechanism, a centering installation method and a maintaining method of a zero-length spring gravimeter. The centering mechanism comprises a radial magnetic levitation stator mechanism, a radial magnetic levitation rotor mechanism and a magnetic levitation peripheral control circuit. The radial magnetic levitation stator mechanism is fixedly connected with a gravimeter shell and comprises a gravimeter frame, an upper magnetic levitation stator assembly and a lower magnetic levitation stator assembly which are arranged in the frame, and a force generator stator assembly. The radial magnetic levitation rotor mechanism comprises a capacitance movable pole plate, a spring sleeve, a zero-length spring, an upper magnetic levitation rotor, a lower magnetic levitation rotor and a force generator rotor which are coaxially mounted in a centering manner; the magnetic suspension rotor mechanism is mounted in the magnetic levitation stator mechanism in a manner of moving along the radial direction and the axial direction; and the magnetic levitation peripheral control circuit is used for detecting the displacement of an air gap between the statorand the rotor and feeding back the information to the control loop, and the control loop matches the current for controlling the magnetic levitation coil according to the information. The mechanism issimple and reliable in structure, high in centering precision and small in centering threshold value.

A valve seat has an outer surface, a rearward end, a face and a forward end. A passage extends from the rearward end to the face. A valve element slidingly contacts the face. Stress relief flanges are located on the face in areas of high bearing stress. Each flange has a thickness that allows it to deflect slightly to reduce bearing stresses.

The invention discloses a serial elastic transmission device based on an integral flexible hinge spring. The device is characterized by consisting of two parts of an input assembly and an output assembly; the input assembly comprises a slide bearing, an adjusting sleeve, a locking nut, bearings pairwise mounted and pretightened, and an input plate and a center shaft integrated; the output assemblycomprises rolling bearings, a fixed screw, and a buffer plate, a flexible hinge spring and an output plate integrated; the input assembly and the output assembly are connected and pretightened through the adjusting sleeve; m rails are uniformly arranged on the input plate in the peripheral direction; and m rolling bearings are arranged in the same positions on the buffer plate, and correspond tothe rails one to one. The flexible hinge spring is used for replacing a traditional snap spring; and through overall machining technology, multiple parts needing to be assembled are integrated as an overall-machined part, so that assembly errors and gaps are prevented, the structure rigidity and stability are improved, and the transmission precision is improved.

The invention discloses a compressor core flexible supporting structure. The compressor core flexible supporting structure comprises a gasket, an elastic element, an upper bush, a lower bush and a convex nail; the gasket is arranged at the upper end of the upper bush, the lower bush is arranged on the convex nail in a sleeving manner, the lower portion of the elastic element is arranged on the lower bush in a sleeving manner, the upper bush is inserted in the upper portion of the elastic element, an overlapping area is arranged between the lower portion of the upper bush and the upper portionof the lower bush, and the lower portion of the upper bush and the upper portion of the lower bush have a certain gap in the overlapping area. The flexible supporting structure is adopted to reduce connection rigidity between a compressor core and a shell, the effect of reducing compressor vibration is achieved, and shell crashing during compressor starting can be avoided.

The main mirror installation and adjustment mechanism relates to a main mirror installation and adjustment mechanism, which solves the problems of complex adjustment methods, poor stability, and axial and radial mutual coupling of existing telescope main mirrors. On the three supporting bosses on the top, the main mirror chamber and the support seat are concentrically arranged, and the adjustment assembly includes the main mirror chamber insert embedded in the main mirror chamber, the receiving ball socket embedded in the bottom of the support seat, and the main mirror chamber set in the main mirror chamber. The adjusting screw in the insert, the screw ball socket embedded in the upper end of the adjusting screw, the steel ball installed between the receiving ball socket and the screw ball socket, and the lock nut installed at the bottom of the adjusting screw, the locking assembly includes The roller on the seat, the seesaw installed on the roller, the locking ball head and the locking ball socket installed on the locking screw and the butterfly gasket, the mechanism described in the present invention can adjust three degrees of freedom, And it has no effect on the shape of the primary mirror.

The invention relates to the field of civil construction engineering, in particular to a grout sleeve with a function of coordination deformation with concrete for prefabricated components. The groutsleeve comprises a sleeve body, a grouting port and a grout outlet are formed in the sleeve body, and a convex groove and a reinforcing rib are arranged on the side wall of the sleeve body. Under thepremise that the ring rigidity of the sleeve is not affected basically, the grout sleeve with the decreased vertical rigidity and shearing rigidity can be used for a connecting position of the concrete prefabricated components. The rigidity of the positions, at the sleeve, of the prefabricated components (plate, beam, column and the like) is prevented from being increased excessively, component deformation is prevented from being excessively concentrated on concrete of the two ends of the sleeve accordingly, and a large crack is prevented from occurring to the concrete at the two ends of the sleeve; and the phenomena of short columns and deep beams can also be avoided.

The invention provides a power capacitor and a vibration and noise reduction device thereof, and the vibration and noise reduction device is arranged between a capacitor core and a box body in a manner of being corresponding to the upper and lower end faces of the capacitor core, and comprises a core bracket for supporting the capacitor core, a bottom plate arranged on a box body, and a pluralityof vibration isolation devices arranged between the core bracket and the bottom plate. Each vibration isolation device comprises a sleeve fixedly installed on a bottom plate and provided with a hollowpipe cavity; a spring piece which is made of an elastic material and covers the tube cavity, wherein the edge of the spring piece is fixedly arranged on the sleeve, and a matching structure is arranged in the middle area surrounded by the edge; a connecting shaft which is matched with the matching structure, wherein the top end is connected with the core bracket. The spring piece has higher radial rigidity and lower axial rigidity, so that the problem that the original capacitor core is suspended and collided in oil is avoided; and a good vibration isolation and reduction effect is achieved through the structure and the viscous effect of oil, and finally the purpose of noise reduction is achieved.

The invention discloses a voice coil motor active suspension, which relates to the technical field of vehicle suspension vibration reduction, and comprises a suspension shell part, a passive vibration reduction loop component and an active vibration reduction loop component, the passive vibration reduction loop component and the active vibration reduction loop component are both arranged in the suspension shell part, and the passive vibration reduction loop component is arranged between the active vibration reduction loop component and the suspension shell part. The top of the passive vibration reduction loop component and the top of the active vibration reduction loop component are both connected with the load end of the suspension shell part. A voice coil motor can be actively controlled to generate exciting force according to real-time working conditions so as to counteract vibration interference, high vibration reduction efficiency is achieved, and the voice coil motor active suspension is suitable for vibration reduction of a vehicle suspension system with high requirements for comfort and stability.