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35results about How to "Increase tolerance range" patented technology

On-orbit interchangeable unit with autonomous guiding and connecting functions

InactiveCN107628278ALarge docking toleranceReliable and precise connectionCosmonautic vehiclesCosmonautic partsElectricityEngineering
The invention belongs to the technical field of on-orbit service, in particular to an on-orbit replaceable unit. The on-orbit replaceable unit with autonomous guiding and connecting functions is disclosed, and the technical scheme is that a passive plate is provided with a coarse guiding hole, a fine positioning hole and a locking screw hole therein; an active plate is provided with a coarse guiding rod and a fine guiding rod thereon; a locking assembly includes a locking shell and a locking rod sleeved therein; the locking rod is provided with a thread; male and female parts of an electricalconnector are respectively mounted on the passive plate and the active plate; and the active plate is mounted at the bottom of an equipment compartment, the locking assembly passes through the equipment compartment, and two ends of the locking shell are respectively connected with the active plate and an adapter. The on-orbit replaceable unit in the invention adopts the guiding way of the combination of coarse guiding and fine guiding, and has the advantages of large tolerance range and high guide precision. The connection interface in the invention adopts the thread form, the power is input by the adapter, and the advantages of fast connection and reliable connection are gained.
Owner:BEIJING INST OF SPACECRAFT SYST ENG

Steel bar connection device and using method thereof

The invention belongs to the technical field of civil engineering, and particularly relates to a steel bar connection device and a using method thereof. The steel bar connection device is used for making a first steel bar connected with a second steel bar, and comprises an eccentric adjusting device, a steel bar connecting piece and an eccentric adjusting device mounting device. The eccentric adjusting device mounting device is arranged on at least one of the first steel bar and the second steel bar. The eccentric adjusting device is mounted on the eccentric adjusting device mounting device. Asliding groove is formed in the eccentric adjusting device, the sliding groove is perpendicular to the extending direction of the steel bars, the steel bar connecting piece is parallel to the extending direction of the steel bars, one end of the steel bar connecting piece is clamped to the sliding groove, and the other end of the steel bar connecting piece is connected with the other steel bar. The steel bar connecting piece slides in the sliding groove under the condition of being kept parallel to the steel bars, so that the eccentric adjusting device rotates. According to the device, the tolerance range is effectively expanded, reasonable deviations caused by production manufacturing, construction installation and the like are satisfied, and the eccentric angle and eccentric distance ofeccentric errors can be adjusted.
Owner:JIANHUA CONSTR MATERIALS (JIANGSU) CO LTD +1

Auto-collimation zero phase shift transmission method based on photonic crystals

ActiveCN103576237AAutocollimation Zero Phase Shift TransmissionImproving the transmission accuracy of point-to-point electromagnetic waves with zero phase shiftOptical light guidesElectricityModulation theory
The invention discloses an electromagnetic wave auto-collimation zero phase shift transmission method based on photonic crystals. A photonic crystal board is formed by periodically arranging homogeneous dielectric substances in space, and the incident plane and the emergent plane of the photonic crystal board are formed by being cut in the space symmetry axis direction of the photonic crystals. When electromagnetic waves with specific wave lengths are injected into the photonic crystal board at random angles within a certain incident angle range, refraction occurs on an interface, the refraction direction of the electromagnetic waves is unchanged through spatial modulation of a photonic crystal periodic structure, equiphase surfaces of the electromagnetic waves can be parallel with the energy flow direction, zero phase shift transmission is maintained in the fixed propagation direction, and therefore auto-collimation zero phase shift transmission of the electromagnetic waves in the photonic crystals is achieved. On the basis of the electromagnetic wave basic theory and the photonic crystal energy band modulation theory, the invention provides a brand new method for achieving auto-collimation zero phase shift transmission of the electromagnetic waves based on photonic crystals. Accordingly, processing techniques are simplified, production cost is reduced, use flexibility is improved, and the method has important academic significances and application value.
Owner:UNIVERSITY OF CHINESE ACADEMY OF SCIENCES

Shut-off valve

This invention relates to a shut-off valve, and primarily to a valve for shutting-off the flow of a fluid such as a mains water supply to commercial premises or a domestic dwelling. The shut-off valve (10) comprises a diaphragm valve and a pilot valve (30). The diaphragm valve has an inlet (14) and an outlet (16), a valve member (26) and a valve seat (22), the valve member having a closed position in which it engages the seat and prevents the flow of fluid from the inlet to the outlet, and an open position in which the valve member does not engage the seat and fluid can flow from the inlet to the outlet. A first fluid conduit (36) connects the inlet of the diaphragm valve to the inlet of the pilot valve, and a second fluid conduit (40) connects the outlet of the pilot valve to the outlet of the diaphragm valve. The pilot valve has an open position in which fluid can flow from the first fluid conduit to the second fluid conduit and a closed position in which fluid cannot flow from the first fluid conduit to the second fluid conduit. The invention is characterized in that the diaphragm valve has a control member (42, 44, 46) which is adapted to hold the valve member against the valve seat, whereby the diaphragm valve remains closed even if the pressure at its outlet equals or perhaps exceeds the pressure at its inlet.
Owner:SURESTOP

Gallium nitride HEMT tube integrated circuit, flyback circuit, bridgeless PFC circuit and laser radar

The invention relates to a gallium nitride HEMT tube integrated circuit, a flyback circuit, a bridgeless PFC circuit and a laser radar. The gallium nitride HEMT tube integrated circuit comprises a first gallium nitride HEMT tube packaged in a tube shell, a reverse follow current unit and a discharge unit; the input end of the reverse freewheeling unit is connected with the source electrode of thefirst gallium nitride HEMT tube, and the output end of the reverse freewheeling unit is connected with the drain electrode of the first gallium nitride HEMT tube and used for forming a reverse freewheeling loop with the first gallium nitride HEMT tube; and the input end of the discharge unit is connected with the drain electrode of the first gallium nitride HEMT tube, and the output end of the discharge unit is used for grounding and carrying out current discharge on the first gallium nitride HEMT tube. A reverse follow current unit is configured for a first gallium nitride HEMT tube of a maintube core; the gallium nitride HEMT tube integrated circuit is enabled to have good reverse follow current capability; and the discharge unit is configured to discharge current for the first galliumnitride HEMT, so that the avalanche tolerance is improved, the tolerance range of the first gallium nitride HEMT of the main tube core is expanded, MOSFETs can be replaced in more scenes, and the performance better than that of the MOSFETs is obtained.
Owner:INNOSCIENCE (ZHUHAI) TECH CO LTD

Self-collimation zero-phase-shift transmission method based on photonic crystal

ActiveCN103576237BImproving the transmission accuracy of point-to-point electromagnetic waves with zero phase shiftIncrease tolerance rangeOptical light guidesElectricityModulation theory
The invention discloses an electromagnetic wave auto-collimation zero phase shift transmission method based on photonic crystals. A photonic crystal board is formed by periodically arranging homogeneous dielectric substances in space, and the incident plane and the emergent plane of the photonic crystal board are formed by being cut in the space symmetry axis direction of the photonic crystals. When electromagnetic waves with specific wave lengths are injected into the photonic crystal board at random angles within a certain incident angle range, refraction occurs on an interface, the refraction direction of the electromagnetic waves is unchanged through spatial modulation of a photonic crystal periodic structure, equiphase surfaces of the electromagnetic waves can be parallel with the energy flow direction, zero phase shift transmission is maintained in the fixed propagation direction, and therefore auto-collimation zero phase shift transmission of the electromagnetic waves in the photonic crystals is achieved. On the basis of the electromagnetic wave basic theory and the photonic crystal energy band modulation theory, the invention provides a brand new method for achieving auto-collimation zero phase shift transmission of the electromagnetic waves based on photonic crystals. Accordingly, processing techniques are simplified, production cost is reduced, use flexibility is improved, and the method has important academic significances and application value.
Owner:UNIVERSITY OF CHINESE ACADEMY OF SCIENCES

Cultivation method of new high-salt-resistant hybrid oyster strain in South China

The invention discloses a cultivation method of a new high-salt-resistant hybrid oyster strain in South China. The method comprises the following steps of preparing a hybrid F1; performing phenotypic character comparison, character separation and identification, reproductive potential evaluation and excellent separation type screening on a hybrid self-breeding offspring F2 under different environmental effects; performing phenotypic character comparison, reproductive potential evaluation and excellent strain determining of a hybrid F3 under different environmental effects; and performing the technical links such as hybrid F4 self-propagation and the like to obtain the new high-salt-resistant hybrid oyster strain suitable for the South China. The strain is different from new oyster hybrid strains obtained in the past, the new hybrid strain is screened out by performing continuous self-propagation screening on different segregation types of the hybrid F2, and the traditional concept that all the segregation types of the hybrid F2 show hybrid disadvantage is overturned; through environmental genotype effect analysis, a set of novel hybrid oyster new strain breeding method is created. and the new hybrid strain obtained by the method has the characteristics of fast growth, strong stress resistance, genetic stability and the like, and the yield is increased by 10%-15% or above.
Owner:SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI

Shut-off valve

This invention relates to a shut-off valve, and primarily to a valve for shutting-off the flow of a fluid such as a mains water supply to commercial premises or a domestic dwelling. The shut-off valve (10) comprises a diaphragm valve and a pilot valve (30). The diaphragm valve has an inlet (14) and an outlet (16), a valve member (26) and a valve seat (22), the valve member having a closed position in which it engages the seat and prevents the flow of fluid from the inlet to the outlet, and an open position in which the valve member does not engage the seat and fluid can flow from the inlet to the outlet. A first fluid conduit (36) connects the inlet of the diaphragm valve to the inlet of the pilot valve, and a second fluid conduit (40) connects the outlet of the pilot valve to the outlet of the diaphragm valve. The pilot valve has an open position in which fluid can flow from the first fluid conduit to the second fluid conduit and a closed position in which fluid cannot flow from the first fluid conduit to the second fluid conduit. The invention is characterised in that the diaphragm valve has a control member (42, 44, 46) which is adapted to hold the valve member against the valve seat, whereby the diaphragm valve remains closed even if the pressure at its outlet equals or perhaps exceeds the pressure at its inlet.
Owner:SURESTOP
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