30results about How to "Smooth pressure fluctuations" patented technology

The invention relates to a fuel injector for injecting fuel into a combustion chamber, having a solenoid valve for controlling a mini-servo valve. A movable armature can be placed in a sealing fashion on a valve seat in a lower armature chamber, wherein in addition the mini-servo valve is held in an injector body and seals a control line against a flat seat. By means of the flat seat, during an actuation of the solenoid valve, the control line can be relieved of pressure from a high fuel pressure to a return pressure into at least one return line. A mechanism for reducing pressure oscillations are provided in the at least one return line, which includes at least one diaphragm cell which is held in a recess and which is placed in fluidic connection with the at least one return bore. A fuel injector with the mechanism for reducing pressure oscillations is therefore created in the at least one return line which operates without a leakage flow and has a simple and effective function.

The invention belongs to the field of energy storage, and discloses a mixed gas separation, mass storage, pressure rise and energy storage device and a method and a utility system, and a heat exchange pressure equalizer. The separation of mixed gas, the pressure rise, the energy storage, the heat exchange and the conversion of gas and liquid are finished in one device, so that the equipment is simplified, the efficiency is improved, and the heat energy is reduced; the cold energy is lost; the energy storage and the energy release can be separately or synchronously performed, so that the emission of carbon dioxide is reduced; and a nitrogen oxide, a sulfur oxide, heavy metal [pm 2.5] and the like are collected for storage and utilization to change harmful substances to useful substances. The invention discloses a gas (air and smoke) condensation, separation and energy storage power station, a wind-electricity plant air separation and energy storage power station, a photovoltaic power generation plant air separation and energy storage power station, a solar heat power air energy storage power station, a wind-electricity solar heat power complementary air energy storage power station, a nuclear power air separation and energy storage power station, a ire coal combustion biomass power generation plane smoke separation and energy storage power station, a gas power generation smoke separation and energy storage power station and an industrial kiln smoke separation and energy storage power station.

A drive signal includes a first drive pulse that causes liquid droplets to be ejected from nozzles and a second drive pulse that causes liquid droplets of a different size from those of the first drive pulse to be ejected from the nozzles. The drive pulses have expansion elements that expand a pressure chamber, contraction elements that contract a pressure chamber, and vibration control elements. An initiation potential of the contraction element of the first drive pulse and an initiation potential of the contraction element of the second drive pulse are the same. The differential voltage between the standard potential and the contraction potential is set to between 40% 50% or less of the potential between the initiation potential of the contraction element and the contraction potential.

The invention provides a double-wall spiral hush pipe and relates to a plastic drain pipe, and particularly relates to a drain pipe capable of sound muffling. The double-wall spiral sound muffling pipe aims to overcome the defect that an existing drain pipe is loud in noise and provide a drain pipeline simple in structure and capable of sound muffling and sound insulating. The double-wall spiral hush pipe comprises a pipe body and is characterized in that the pipeline wall is in a connection and double-layer structure, gapped through holes are evenly formed between the inner wall and the outer wall at intervals, protruding river diversion ribs are evenly arranged along the inner pipeline wall. The double-wall spiral hush pipe mainly applies to a modern construction drainage system.

The invention relates to a fracturing truck hydraulic system and a control method thereof. The system comprises an engine, an oil pump, a hydraulic motor and at least one energy accumulator, the engine is in driving connection with the oil pump, the oil pump is connected with the hydraulic motor through a high-pressure oil way and a low-pressure oil way, the hydraulic motor is suitable for being in driving connection with a fracturing pump, and the energy accumulators are connected into the high-pressure oil way between the oil pump and the hydraulic motor. According to the technical scheme, the operation stability of the fracturing truck hydraulic system can be guaranteed.

The invention discloses a PP (polypropylene) internal spiral pipe for drainage. The PP internal spiral pipe comprises a pipe body made of a PP material, wherein the PP material is prepared from raw materials in parts by weight as follows: 25-30 parts of PP aggregates, 50-60 parts of barium sulfate, 13-18 parts of montmorillonite and 1-3 parts of a dispersing agent; a plurality of spiral ribs are arranged in the circumferential direction of the inner wall of the pipe body, a radial section structure of each spiral rib is a half-crescent structure with an arc top, an inner concave surface of the half-crescent structure and a spiral trend of the spiral rib are located in the same plane, two sides of the root part of the spiral rib are in circular arc transition connection with the inner wall of the pipe body, and a screw pitch of the spiral rib is 60-100 cm. According to the PP internal spiral pipe for drainage, water passing capacity is greatly enhanced, and water flow noise is greatly reduced. The invention further discloses a preparation method of the PP internal spiral pipe for drainage.

The invention relates to a life buoy inflation detection device and method. The device comprises an air source, a proportional electromagnetic valve, normally closed electromagnetic valves, buffer airpipes, an air storage tank, pressure sensors, an inflation nozzle and an industrial personal computer, the air source is connected with the first buffer air pipe through the proportional electromagnetic valve, and two ends of the proportional electromagnetic valve are connected with the first normally closed electromagnetic valve in parallel; the first buffer air pipe is simultaneously connectedwith the air storage tank and the second normally closed electromagnetic valve, the other end of the second normally closed electromagnetic valve is connected with the inflation nozzle through the second buffer air pipe, the first pressure sensor and the second pressure sensor are arranged at the two ends of the second normally closed electromagnetic valve correspondingly, and the second pressuresensor, the industrial personal computer and the proportional electromagnetic valve form closed-loop feedback; and the second pressure sensor feeds back the measured inflation pressure value of a lifebuoy to the industrial personal computer, the industrial personal computer automatically adjusts the opening degree of the proportional electromagnetic valve through fuzzy PID control, and then the inflation pressure value is continuously adjusted to be close to the preset pressure value. The device and method are beneficial to improving the efficiency and the precision of air inflation, shortening the air inflation time and accurately controlling the air inflation amount.

The invention discloses a multi-margin pump and valve combined hydraulic system for an electro-hydraulic servo six-degree-of-freedom parallel robot. The multi-margin pump and valve combined hydraulic system comprises a static pressure supporting servo cylinder, a valve control module and a pump control module. The valve control module is a redundant valve group formed by connecting a servo valve, a proportional valve and an electromagnetic directional valve in parallel, the valve control module is designed into a multi-valve parallel scheme capable of realizing non-interference switching of oil ways, and the working stability and reliability of a servo cylinder are ensured; the pump control module is composed of a variable pump and a motor, and it is guaranteed that the system can still achieve high-precision motion control under the condition that a servo valve and a proportional valve fail. The valve control module is combined with the pump control module to ensure that the static pressure supporting servo cylinder always keeps a high-precision motion control state to be matched with an independently-controlled switch valve to achieve interference-free switching of oil ways, in addition, energy accumulators are arranged at multiple positions, pipeline pressure fluctuation is stabilized, the flow peak value of a pump station is compensated, the working stability of the system is effectively improved, and the service life of the system is prolonged. And the energy utilization rate is improved.

The invention discloses a secondary ink box structure and a printing device.The secondary ink box structure comprises an ink box body, a filter screen, an ink inlet connector, an ink outlet connector, a heating piece, a temperature sensor and a liquid level meter, and the ink box body is covered with a first cover plate and a second cover plate to form a sealed containing cavity; the filter screen is arranged in the accommodating cavity of the ink box main body so as to divide the accommodating cavity into a first accommodating cavity and a second accommodating cavity; the ink inlet connector is arranged on the ink box body so that ink can flow into the first containing cavity through the ink inlet connector. The ink outlet connector is arranged on the ink box body so that ink can flow out through the ink outlet connector after flowing into the second containing cavity. The heating sheet is arranged on the ink box main body so as to heat ink in the ink box; the temperature sensor is arranged on the ink box main body and is used for measuring the temperature of ink in the ink box; the liquid level meter is arranged on the ink box main body and is used for measuring the height of ink in the ink box; therefore, the pressure fluctuation of the ink in the ink box main body can be greatly reduced, and the printing quality is improved.

A sand-discharging submerged pump technically features that a water tank is arranged outside the lower bearing chamber of dry-type motor and an oil tank with oil dropping hole on its bottom is arranged above the bearing. Said water tank has top opening and through hole communicated to cavity between mechanical seal and lower bearing. Said water tank can collect the water come into motor and said oil tank can cool the bearing.