5results about How to "Reduce vibration levels" patented technology

The application discloses a low-vibration active phase modulation composite pulse tube Stirling cryogenic refrigerator and belongs to the technical field of cryogenic refrigerators. The composite refrigerator cold finger integrates a first Stirling component as a high-temperature stage and a second pulse tube component as a low-temperature stage. The innovation is that the phase modulation unit of the second pulse tube component is composed of a second inertia tube wound and fixed in the inner circle of the gas reservoir, and the gas reservoir is integrally connected to the first cold end heat exchanger to improve the system efficiency through low-temperature arrangement. At the same time, the motion state of the compressor piston and the first displacer is monitored and cooperatively controlled in real time through the compressor displacement sensor and the cold finger displacement sensor, active and accurate phase modulation is realized, and the active vibration damper is used to perform reverse compensation according to the motion feedback of the first displacer to significantly offset the vibration output of the whole machine. The application realizes the unity of high efficiency, low vibration and high reliability, and is particularly suitable for vibration-sensitive space exploration and other application scenarios.

This utility model discloses a vibration absorber for a subframe. Relating to the field of vehicle technology, the vibration absorber includes: a mass block with a first mounting hole extending through it along a first direction, which is the axial direction of the vibration absorber; a clearance opening formed on the outer peripheral wall of the mass block; a vibration-absorbing structure fixed to the mass block, with at least a portion of the structure located within the first mounting hole; and the structure for fasteners to pass through, allowing the vibration absorber to be fixed to the subframe by fasteners. By forming a clearance opening on the outer peripheral wall of the mass block, the gap between the mass block and surrounding components is increased, preventing interference and providing a larger installation allowance for the vibration absorber. This reduces the installation difficulty and improves installation efficiency. The vibration absorber, fixed to the subframe by fasteners, reduces vibration transmission to the subframe, helping to lower in-vehicle noise and vibration levels, reduce the risk of vehicle humming, and improve vehicle comfort.

The invention provides an anti-seismic diesel engine fire pump set, which relates to the technical field of fire fighting equipment and comprises an anti-seismic diesel engine fire pump set base, a diesel engine and a fire pump, the anti-seismic diesel engine fire pump set base comprises a base frame and at least one reinforcing steel channel main beam arranged on the base frame. The diesel engine main engine is fixedly mounted on the anti-seismic diesel engine fire pump set base through the integrated base; the fire pump is fixedly installed on the anti-seismic diesel engine fire pump set base through pump feet and comprises a double-volute pump body fixedly installed on the pump feet, a pump cover connected with the double-volute pump body and located above the double-volute pump body, a pump shaft penetrating through the double-volute pump body and the pump cover and a double-suction impeller installed on the pump shaft. The anti-seismic performance of the diesel engine fire pump set is improved, and normal operation of the whole pump set under the earthquake working condition is guaranteed. According to the double-volute pump body and the double-suction impeller, the axial force generated when the impeller operates can be self-balanced, meanwhile, the radial force of the impeller is reduced, and the pump shaft operates more stably.

The application discloses an unmanned helicopter vibration isolation device, which comprises a support rod, a reducer hinge, a frame hinge and an elastic element. The elastic element is arranged between a machine body and a main reducer. One support rod, one reducer hinge and one frame hinge form one vibration isolation group. The unmanned helicopter vibration isolation device comprises four vibration isolation groups. Two parallel vibration isolation groups form one pair. Two pairs of mirror images are distributed on two sides of the machine body. The support rod connects the main reducer and the machine body. Straight lines formed by two ends of the mirror image distributed support rod intersect at one intersection point. Two intersection points formed by the four vibration isolation groups form an axis. The main reducer can swing around the axis. The axial stiffness of the support rod is very high. Therefore, the linear displacement between the main reducer and the machine body is very small. The swing frequency is low. The vibration level of the unmanned helicopter is reduced. The elastic element is arranged between the main reducer and the machine body. The elastic element can isolate the vibration load generated by the main reducer and the machine body. The stability of the unmanned helicopter is improved.

The utility model relates to the technical field of pump equipment, in particular to a novel air bag pump. The air bag pump comprises a pump body and a reversing valve, the left end and the right end of the pump body are provided with two compression cavities communicated with the ball valve, and corrugated pipes are installed in the two compression cavities respectively. Threaded end pipes are arranged at the positions, at the outer ends of the two compression cavities, of the pump body respectively, end covers are connected to the threaded end pipes in a threaded mode, the corrugated pipes are fixedly pressed in the compression cavities through the end covers respectively, air inlet holes and air outlet holes which are communicated with the interiors of the corrugated pipes are formed in the end covers, and the air inlet holes and the air outlet holes are connected with an air inlet pipe connector and an air outlet pipe connector respectively. The gas inlet pipe joint and the gas outlet pipe joint are connected with the reversing valve through gas-guide pipes; the inner side of the end cover is provided with a mounting counter bore communicated with an air outlet, a piston assembly is arranged in the mounting counter bore, the front end of a piston rod of the piston assembly is supported in the center of the air bag, and a plurality of damping strips are arranged between the piston assembly and the inner side of the end cover at intervals, so that the vibration magnitude is effectively reduced, pump vibration and noise are solved from the source, and the damping and noise reduction effects are good.