33results about How to "Avoid excessive leakage" patented technology

An endoluminal prosthesis includes a tubular graft, an expandable annular support structure and a restraining mechanism restraining the prosthesis in a collapsed configuration in which the annular support structure is compressed to a low profile. The restraining mechanism holds the annular support structures in the collapsed configuration until the prosthesis is positioned for deployment. The restraining mechanism is then released to allow the annular support structures to expand into conforming engagement with the inner wall of a lumen in which the prosthesis is to be deployed. A feature according to the invention provides a balloon catheter onto which the prosthesis is loaded for deployment where the balloon is expanded to provide a radial force to release the restraining mechanism. Another feature provides for a restraining member that breaks upon application of the radial force to release the annular support structure from its constrained configuration. Another feature of the invention provides for independent and / or sequential release of the annular support members. Various types of annular support members attached to tubular grafts in a variety of manners may be used in accordance with the invention. The invention may be used in tubular grafts for endoluminal placement within a body lumen, including blood vessels, and for the treatment of abdominal and other aneurysms.

An endoluminal prosthesis is provided that includes a tubular graft and an expandable annular support structure. The annular support structure is coupled to the tubular graft so that the graft and support structure, in combination, provide columnar support while maintaining prosthesis flexibility. The prosthesis has sufficient strength and durability to withstand loads applied during deployment and sufficient flexibility to permit implant in a sealing arrangement within a tortuous body lumen. An embodiment according to the invention provides a plurality of annular structures with staggered, longitudinally overlapping apices of undulating structures. One embodiment relates to tubular grafts for endoluminal placement within a body lumen, including blood vessels, and for the treatment of abdominal and other aneurysms.

An endoluminal prosthesis is provided that includes a tubular graft and an expandable annular support structure for use in a body lumen through which body fluids flow. The annular support structure is coupled to the tubular graft where it is to be sealingly engaged with the inner wall of a body lumen so that the graft and support structure, in combination, provide an improved seal. An embodiment according to the invention provides an annular structure with longitudinally staggered apices providing multiple levels of contact with the inner body lumen wall to provide a seal at multiple levels along the length of the prosthesis. One embodiment relates to tubular grafts for endoluminal placement within blood vessels for the treatment of abdominal and other aneurysms.

Sliding parts are provided where a plurality of dynamic pressure-generating grooves for generating dynamic pressure via the relative rotational sliding of the stationary ring and the rotating ring are formed in a circumferential direction on a sealing face of one of a stationary ring and the rotating ring so as to communicate with a sealed fluid-containing space, and pumping areas for generating pumping action via the relative rotational sliding of the stationary ring and the rotating ring are formed within the dynamic pressure-generating grooves.

A common rail directly actuated fuel injection valve is disclosed with a hydraulic transmission device that is fluidly isolated from the fuel so that the hydraulic fluid can be different from the fuel. This arrangement is particularly suitable for valves that inject a gaseous fuel, but can also be beneficial for use with liquid fuels. According to the method, the hydraulic fluid is pressurizable by the fuel pressure to reduce differential pressures and leakage, in addition to assisting with operation of the hydraulic transmission device. The method further comprises detecting the position of the valve needle for more accurate control of rate of fuel injection during an injection event.

A common rail directly actuated fuel injection valve is disclosed with a hydraulic transmission device that is fluidly isolated from the fuel so that the hydraulic fluid can be different from the fuel. This arrangement is particularly suitable for valves that inject a gaseous fuel, but can also be beneficial for use with liquid fuels. According to the method, the hydraulic fluid is pressurizable by the fuel pressure to reduce differential pressures and leakage, in addition to assisting with operation of the hydraulic transmission device. The method further comprises detecting the position of the valve needle for more accurate control of rate of fuel injection during an injection event.

Aphron-containing oil based well drilling and servicing fluids are disclosed which seal microfractutres and the like during drilling and well servicing operations, thus decreasing the volume of fluid lost to the formations contacted by the fluids. The fluids comprise an oleaginous liquid as the continuous phase, a viscosifier which imparts a low shear rate viscosity to the fluids of at least 10,000 centipoise, an aphron-generating surfactant, and aphrons. The fluids are used in a conventional method of drilling an oil and / or gas well or in conventional methods of servicing or treating such wells, such as in completion, workover, sand control, and frac pack operations, and as spotting fluids to released stuck pipes or tools in a wellbore.

Sliding parts are provided where a plurality of dynamic pressure-generating grooves for generating dynamic pressure via the relative rotational sliding of the stationary ring and the rotating ring are formed in a circumferential direction on a sealing face of one of a stationary ring and the rotating ring so as to communicate with a sealed fluid-containing space, and pumping areas for generating pumping action via the relative rotational sliding of the stationary ring and the rotating ring are formed within the dynamic pressure-generating grooves.

A surface light source device has a point light source disposed opposite a light incident surface of a light guide plate. The light guide plate includes a light introduction part, and a light guide plate body having a thickness smaller than a maximum thickness of the light introduction part. The light introduction part includes an inclined surface inclined from a surface in a portion having a thickness larger than the thickness of the light guide plate body toward an end of the surface of the light guide plate body. The light guide plate body has a light exit pattern for reflecting the light in the light guide plate body to output the light from a light exit surface. In a region close to the point light source of the light guide plate body, the thickness of the light guide plate body increases gradually with distance from the point light source.

A high-pressure side primary pressure chamber communicates with a secondary pressure chamber on the side of a pressure receiving device through a communication hole. A diaphragm which receives the pressure in the secondary pressure chamber is provided, and a valve body is connected to the diaphragm. The diaphragm is biased by a spring in a valve opening direction. The area S (mm2) of the pressure receiving surface of the diaphragm and the spring constant k (N / mm) of the spring are set so as to satisfy the following equations (1) and (2).P1×S−k×ΔL>C  (1)P1<P2  (2)where P1 denotes the pressure (MPa or N / mm2) of the secondary pressure chamber, ΔL denotes the displacement (mm) of the spring, C denotes the minimum closing load (N) of the valve body, and P2 denotes the allowable maximum pressure (MPa or N / mm2) of the pressure receiving device.

The embodiment of the invention discloses a memory erasing method and device. The memory erasing method comprises the following steps: detecting a power-on signal of a memory; and controlling a plurality of memory blocks in the memory to carry out over-erase verification operation at the same time, so that the threshold voltages of all memory units in the memory are greater than zero voltage. According to the technical scheme provided by the embodiment of the invention, the problems of serious electric leakage of the storage unit and influence on normal use caused by abnormal power failure ofthe existing memory can be solved.

A raceway bushing which has a substantially cylindrical peripheral wall that forms a bushing inner surface and a bushing outer surface, a bottom wall which extends from the peripheral wall and has an inner bottom surface and an outer bottom surface, and a bottom opening configured in the bottom wall. The bottom opening is bordered by an annular collar that rises axially beyond the inner bottom surface.

The invention relates to the field of internet social contact, and provides a social contact method and device based on a license plate and a gift, a server, a client, a terminal and a storage medium, and the method comprises the following steps: S1, obtaining an authentication request for authenticating a license plate number submitted by a vehicle owner user; S2, through the authentication request, associating the license plate number with the vehicle owner user, and storing an authentication record; S3, obtaining a giving instruction of giving a gift to a vehicle owner user associated with the license plate number by the giving user; S4, querying a vehicle owner user associated with the license plate number according to the license plate number in the presentation instruction; and S5, giving a gift associated with the giving instruction of the giving user to the vehicle owner user. According to the invention, the social opportunities of the owner user are increased by utilizing the display and propaganda of the owner user automobile, the own image or the automobile decoration; meanwhile, giving a gift of a vehicle owner user as an expression mode of social willingness; the gift is used as the expression and communication threshold of the communication intention, so that the vehicle owner user is prevented from being excessively harassed and the privacy of the vehicle owner user is prevented from being excessively leaked.

A negative pressure control device of vortex compressor comprises a negative pressure cavity formed on the side of the upper frame holding the fluid on the discharge side of the vortex compressor and the lubricating oil from the lubricating oil storage tank, a by-pass pipeline connecting the negative pressure cavity with the suction side of the vortex compressor and a negative pressure control part opening and closing selectively the by-pass pipeline. The invention can reduce pressure difference between inner part and outer part of the small negative cavity to prevent the lubricating oil overleaking from the negative cavity.

The invention discloses a double-layer oil storage tank which comprises a tank body and manholes formed in the circumferential surface of the upper end of the side face of the tank body. The tank body comprises an inner tank part, an outer tank part and a middle layer. The surface of the middle layer is of a convex-concave structure. The middle layer is arranged in the space between the inner tank part and the outer tank part. The double-layer oil storage tank has the beneficial effects that by designing and applying the middle layer with different thicknesses, the volume of the interlayer space can be controllable; the middle layer is good in fitting performance, sealing performance, heat reflection and thermal conductivity, and therefore the situations of temperature rise and uneven temperature distribution caused by thermal radiation of the oil storage tank can be effectively relieved; when oil leaks, the leaked oil can be detected in time, and a detection signal is transmitted to a remote alarm and a remote monitoring station in time, so that measures are taken for preventing excessive leakage of the oil storage tank and reducing losses; the overall structural strength of the outer tank part is high, in this way, the external load of the oil storage tank can be resisted effectively, and stress concentration is avoided.

The invention provides a cooking device which comprises a cooking cavity which is provided with a first exhaust port, an exhaust guide pipe, and a pressure relief assembly. An inner end part of the exhaust guide pipe is connected to the first exhaust port, and the exhaust guide pipe is suitable for exhausting steam in the cooking cavity to the outside; the pressure relief assembly comprises a blocking piece, the blocking piece is arranged at an outer end part of the exhaust guide pipe and suitable for blocking a pressure relief opening of the exhaust guide pipe, and the blocking piece has a closed state abutting against the pressure relief opening and an exhaust state leaving the pressure relief opening under pushing of steam. The blocking piece is arranged at the outer end part of the exhaust guide pipe; the exhaust guide pipe is shielded, the excessive leakage of heat in the cooking cavity is avoided, the heat efficiency of the device is improved, the temperature uniformity of the whole cooking device is guaranteed, the situation that due to the fact that the temperature point below the pressure relief opening is too low, the cooked degree of food is not uniform, and a user's eating is affected is avoided, in addition, the opening and closing of the pressure relief opening are controlled through the blocking piece, the structure is simple, and stability is high.

The invention relates to an electronic circuit capable of recognizing a null line automatically. The electronic circuit comprises a live wire (J1), a null line (J2), together with the live wire (J1), forming a loop, a voltage sampling terminal (D) connected to a ground protection line (J4) by a first resistor (R9), a voltage comparison circuit, and a selection circuit. The voltage comparison circuit is used for comparing the voltage of the voltage sampling terminal (D) with a voltage obtained by partial pressure sampling by the electronic circuit; and the selection circuit connected to the output terminal of the voltage comparison circuit is used for selecting a branch circuit where the null line is located based on an output signal of the voltage comparison circuit. Compared with the prior art, the electronic circuit has the following beneficial effects: a null line port can be identified effectively; for special electrical equipment needing null line connection, an effect of identifying a null line can be realized; even when wrong connection between a live wire and a null line occurs, the output terminal of the circuit can be connected with the null line and the live wire correctly; the live wire and the null line can be monitored automatically; and the structure is simple and the effect is obvious.

A flexible irrigation pipe including porous and non-porous segments combined together to avoid unnecessary water loss and improve water distribution along the porous segments of the irrigation pipe.

A raceway bushing which has a substantially cylindrical peripheral wall that forms a bushing inner surface and a bushing outer surface, a bottom wall which extends from the peripheral wall and has an inner bottom surface and an outer bottom surface, and a bottom opening configured in the bottom wall. The bottom opening is bordered by an annular collar that rises axially beyond the inner bottom surface.

The constant temperature mosquito net frame with mosquito repelling function, including: energy main box, constant temperature box, wind deflector, air transmission wind plate, micro-sonic wave rod and heat energy transmission frame, said energy main box is provided with at least one, and Connect the constant temperature chassis, the outer side of the energy main chassis is provided with a safety valve, the safety valve is connected to the signal display board, the constant temperature chassis is connected to the signal display board, and the side of the energy main chassis is provided with a wind deflector, The air deflector is provided with two or more, and is connected to the exhaust air plate, and the heat energy transmission rack is arranged on one side of the main energy box, and the heat energy transmission rack is connected to the condensation conveyor through the micro-sonic wave rod frame, the micro-sonic wave rod is provided with at least two.

The invention discloses a hydraulic oil temperature control structure of a high-pressure diaphragm compressor, and relates to the technical field of diaphragm compressors. The temperature of the hydraulic oil is accurately controlled by dynamically adjusting heat exchange between the hydraulic oil and the outside, energy consumption increase caused by too low oil temperature can be avoided, hydraulic oil emulsification caused by too high oil temperature can be prevented, the efficiency of the high-pressure diaphragm compressor is improved, and the service life of the high-pressure diaphragm compressor is prolonged. The hydraulic oil temperature control structure of the high-pressure diaphragm compressor comprises an oil side diaphragm head, an oil cavity and an oil cylinder hole which are communicated with each other are formed in the oil side membrane head; a piston is arranged in the oil cylinder hole and can reciprocate in the oil cylinder hole; a mounting cavity is formed between the oil cavity and the oil cylinder hole, and an oil distributor is arranged in the mounting cavity; an external oil pipe is arranged on the outer side of the oil side membrane head; two ends of the external oil pipe are respectively communicated with the oil cavity and the oil cylinder hole; and an enhanced heat exchange device is arranged outside the external oil pipe. The performance and reliability of the high-pressure diaphragm compressor are improved.

The invention relates to an inverse-7 type automatic paper collecting machine. The inversed-7 type automatic paper collecting machine comprises a machine frame in an inverse-7 type, the machine frame comprises a paper feeding guide rail and a paper collecting table, the paper collecting table comprises a paper limiting and adjusting device, paper enters the paper collecting table through the paper feeding guide rail, and the position of the paper is adjusted by the paper limiting and adjusting device. The paper limiting and adjusting device comprises a front paper stopping plate, a back paper stopping plate and side paper patting plates, and the paper is clamped and limited by the front paper stopping plate, the back paper stopping plate and the side paper patting plates at the same time. The paper collecting table is provided with a lifting guide rail, is provided with a sliding block and is in up-and-down slide fit with the lifting guide rail. The inverse-7 type automatic paper collecting machine has the beneficial effects that the structure of a double-layer rail is adopted, so that the using number of second paper patting sliding rails is saved, outleakage caused by too long paper patting guide rails during small paper collecting is better avoided, and the upper space for paper collecting is reduced; and an inverse-7 type mechanism is adopted, and the structure is long in lower portion and short in upper portion, so that the stable containing function is achieved, and the upper space is wide.

The invention discloses a hydrolysis reactor automatic switching control method for an ammonia production system, which comprises the following steps: preheating a second reactor, and controlling thepressure of the second reactor to ensure that the pressure of the second reactor is stable to finish preheating preparation before switching of the second reactor; continuously adjusting the temperature of the second reactor to a first preset temperature value; controlling the urea flow according to a second preset flow value matched with the minimum ammonia demand; reducing switching fluctuations, meanwhile, when the temperature, the pressure and the urea flow of the second reactor are respectively in a preset deviation range, controlling the second reactor and the first reactor to increase and decrease the load in a preset mode until the urea flow of the first reactor meets the requirement, and finishing switching. The switching process is small in switching fluctuation, the pressure ofthe ammonia gas main pipe is effectively controlled to be stable, the ammonia gas yield meets the boiler requirement, and NOX overdischarge and ammonia gas leakage exceeding the standard of a boiler system are prevented; the production condition is continuous and stable, the workload of operators is reduced, the production efficiency is improved, and safe production is ensured.

The invention discloses an external compound formula for comprehensively preventing and treating epidermal stem cell reactive oxygen species damage based on apocynin. The external compound formula comprises the following components of (0.002-0.4%) of apocynin, (0.2-5%) of magnesium ascorbyl phosphate, (0.05-0.8%) of tert-butylhydroquinone and (0.1-3%) of dihydrolipoic acid. The inventor establishes a theoretical framework of improving the ROS proliferation promoting second messenger sensitivity of cells, reducing the Nox enzyme activity and relieving the ROS damage of epidermal stem cells on the basis of regulating mitochondrial respiratory chain and lysosomal ROS production in long-term research; on the basis, the technical scheme of low-activity Nox enzyme with apocynin as the main component is screened in a targeted manner, so that ROS senescence injury is comprehensively relieved. In addition, in formula development, a high-throughput standardized cell experiment and a random double-blind control multi-center volunteer experiment are utilized to accurately detect the action range and toxicity threshold of each component, so that the dosage has a certain tolerance level and extremely high safety, and the formula is suitable for being used as a core formula for product development.

The invention belongs to the field of industrial valves, and particularly relates to a gradual change type single board structure of a wedge-type flashboard. The gradual change type single board structure of the wedge-type flashboard comprises a single board, and the thickness of the single board is gradually increased from the lower end of the flashboard to the upper end of the flashboard. The structure has the remarkable effects that the strength and rigidity of the sealing surface at the upper end of the flashboard are improved, and the situation that the leakage rate exceeds the standard due to the fact that the upper end of the flashboard is large in strain during working is avoided.

The invention discloses a control method for automatic switching of hydrolysis reactors in an ammonia production system, which preheats the second reactor and controls the pressure of the second reactor to ensure that the pressure of the second reactor is stable and completes the process before switching the second reactor. Preheating preparation; continue to adjust the temperature of the second reactor to the first preset temperature value, and control the urea flow rate with the second preset flow value matched with the minimum ammonia demand to reduce switching fluctuations. When the temperature, pressure and urea flow rate are respectively within the preset deviation range, the second reactor and the first reactor are respectively controlled to increase or decrease the load in a preset way until the urea flow rate of the first reactor meets the requirements, and the switching is completed. The fluctuation of process switching is small, and the pressure of the main pipe of ammonia gas is effectively controlled to be stable, so that the output of ammonia gas meets the requirements of the boiler, preventing excessive discharge of NOX in the boiler system and excessive leakage of ammonia gas; the production conditions are continuously stable, reducing the workload of operators and improving production efficiency , to ensure safe production.