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

A water preclusion device for a watercraft with an internal combustion engine for inhibiting the intrusion of water upstream into an exhaust system. The water preclusion device includes a valve controlled by exhaust gas pressure.

In an injection system having a device for metering fuel into an exhaust system of a Diesel engine, and a method for controlling the injection of fuel into the exhaust system, wherein the injection system has a high-pressure pump which feeds fuel to an accumulator under high pressure and injectors which inject fuel from the accumulator into the combustion chambers of the internal combustion engine, a fuel spray nozzle arranged in the exhaust system is in communication with the injection system via a fuel metering unit including a control valve and a metering valve and a pressure regulating valve is arranged between the control valve and the metering valve for controlling the pressure of the fuel being metered by the metering valve for injection into the exhaust system via the spray nozzle.

The invention provides a tire production device including: a moulding drum (10), which is provided with an annular moulding surface (11). The moulding drum is arranged in a pivot manner, wherein a pivot axial line of the moulding drum (10) is coincided with the axial line of the annular moulding surface (11) and is extended in a horizontal first direction. The tire production device also includes a rubber supply apparatus (100), which includes: a rubber supply extruder (20) comprising a rubber material inlet (21) and a rubber strip extrusion outlet (22); a pressing mechanism (30) including a pressing part (31) which has a pressing status in which a rubber strip extruded from the rubber strip extrusion outlet (22) is pressed onto the annular moulding surface (11) and a de-pressing status in which the pressing part (31) is far away from the annular moulding surface (11). The rubber supply extruder (20) includes a melt metering pump (23), which is arranged at the rubber strip extrusion outlet (22). The tire production device improves uniformity of tires.

The invention provides a modular common rail pipe structure. The structure comprises a rail pressure sensor, a sealing pad, a common rail pipe body, a safety valve, a connecting piece and common railpipe modules, wherein one end of the common rail pipe body is connected with the rail pressure sensor through a rail pressure sensor mounting hole of the common rail pipe body, and the rail pressure sensor realizes high-pressure sealing by tightly pressing the sealing pad; the other end of the common rail pipe body is connected with the safety valve through a common rail pipe body connecting holeof the common rail pipe body, and the safety valve realizes high-pressure sealing by tightly pressing the sealing pad; or, the other end of the common rail pipe body is connected in series with at least one common rail pipe module through a common rail pipe body connecting hole of the common rail pipe body in combination with the connecting piece, the other end of the last common rail pipe moduleis connected with the safety valve, and the safety valve realizes high-pressure sealing by tightly pressing the sealing pad. The common rail pipe can meet the demands of engines with different numbersof cylinders; meanwhile, the volume of the common rail pipe is increased, and high-pressure common rail pressure fluctuation is stabilized; and the structure is simple and easy to realize.

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 discloses a method for preparing a PVC-U (Unplasticized Poly Vinyl Chloride) hollow-wall internal-screw sound absorbing tube, comprising the following steps of: (1) preparing an extrusion die, wherein the die cavity of the extrusion die is a cylinder of which two ends are open, the inner surface of the cylinder is provided with a plurality of grooves at even intervals along the center direction of the die cavity, a plurality of ribs are evenly arranged at even intervals in the peripheral direction in the cylinder, the inclining direction of the ribs can be adjusted, and therefore the thicknesses of the inner wall and the outer wall of the hollow-wall internal-screw sound absorbing tube can be adjusted according to design requirements; and fixing the extrusion die on an extruder; (2) proportioning materials: and mixing PVC resin, thermostabilization lubricating agent, filler, processing aid and pigment in ratio; (3) mixing materials; (4) charging; (5) extruding and plastifying; (6) pulling out the plastified PVC resin from the extrusion die by a traction apparatus; (7) rotating; (8) cooling and shaping; and (9) cutting the shaped tube according to the required length. The invention also discloses a PVC-U hollow-wall internal-screw sound absorbing tube.

The invention relates to a combustion gas turbine low-emission combustion chamber and a variable load air distribution adjusting method. The combustion chamber comprises a casing, a casing top cover arranged on the top of the casing, an air inlet formed in the side face of the casing, a flame tube arranged inside the casing, a combustion chamber head arranged at the top of the flame tube and an air distribution mechanism arranged on the side face of the flame tube and matched with the air inlet; and the position of an air adjusting plate relative to the a doping hole is adjusted to adapt to unit load changes. Compared with the prior art, the combustion gas turbine low-emission combustion chamber can significantly improve the circumferential uniformity of main combustion stage premixed gas in the combustion chamber head, stabilize the pressure fluctuation of the main combustion grade gas and stabilize an on-duty stage flame, so that the pollutant emission of the combustion chamber is reduced. By changing the position of the air adjusting plate at different loads, the air intake ratio of the combustion chamber head is adjusted, so that the wide load adaptability of the combustion chamber is improved, and the pressure loss caused by structural changes is reduced.

The invention discloses a compressor stator and a compressor. The compressor stator comprises a stator body with the cut side. A cavity and a guide-in channel are formed in the stator body. The first end of the guide-in channel communicates with the cavity. An opening is formed in the portion, at the cut side of the stator body, of the second end of the guide-in channel. By the adoption of the compressor stator and the compressor, the problem that in the prior art, the noise of the whole compressor is large is solved effectively.

The invention relates to a sea water desalting plant implanted into a wind power tower, and belongs to the field of sea water desalination. The sea water desalting plant comprises an evaporator. A porous barrier partitions the evaporator into an upper steam cavity and a lower sea water cavity. The porous barrier is a hydrophilic thermal insulation porous medium, the inner pore diameter is that of a micrometer hole, and the upper side of the porous barrier is coated with a heat absorption coating. The steam cavity is sequentially connected with a condenser, a condensation tank and a fresh water tank through a pipe. One end of the sea water cavity is connected with a sea water pipe to be used for water inputting, and the other end of the sea water cavity is connected with a salt pipe to be used for water outputting. Heat exchange is conducted on the sea water pipe and the salt water pipe through a heat exchanger, and an outlet of the salt water pipe is connected with a piston type water pump to pump out salt water. The center of the porous barrier and the center of the condensation tank are 10 meters away from the sea level in height. By means of the sea water desalting plant, stable and long-time sea water desalting can be achieved without inputting external power and electricity, the thermal utilization efficiency is high, and an effective path is provided for emergency water for ocean working, help seeking and the like or large-scale water contributing.

The invention discloses a mechanical seal test system for a nuclear main pump, which is characterized in that the system comprises a medium concentration control zone, an injection medium processing zone, a frame zone and a reflux medium post processing zone. A test main shaft is used as a driven component in the frame zone; the test shaft is provided with a fluid static pressure seal or a fluid dynamic pressure seal or a fluid dynamic-static pressure combined seal. In the injection medium processing zone, a seal medium flow passage located between a low pressure container and a system seal cavity is respectively provided with a high pressure pump, a high pressure buffer tank and an energy accumulator, which are connected in series with a switchable magnetic filter, an organic filtering film and used,for providing a system pressure source; in the reflux medium post processing zone, a long pipe throttling cooler with a back pressure value is arranged at an outlet of the system seal cavity. The invention not only can simulate a fluid static pressure mechanical seal test for the nuclear main pump, but also can simulate a fluid dynamic pressure mechanical seal test for the nuclear main pump, at the same time, the invention further can simulate a fluid dynamic-static pressure combined mechanical seal test for the nuclear main pump.

The invention provides a baffle and a compressor having the same. The baffle includes: a main body with a free end and a mounting end; a gas introduction part arranged at the free end of the main body, and the gas introduction part includes an introduction channel extending on the free end. The gas introduced into the channel vibrates continuously under the action of pressure fluctuations. Due to the friction and damping effect of the gas vibration, part of the sound energy is converted into heat energy and dissipated. The corresponding pressure fluctuations become relatively gentle, and the airflow noise is reduced accordingly. . The baffle plate of the present invention and the compressor having the same can effectively reduce the air flow pulsation noise generated by the exhaust pressure and the gas return pressure, and solve the problem of a large amount of air flow pulsation noise in the exhaust process in the prior art.

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.

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.