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 relates to a method and a circuit arrangement for controlling and regulating the supply of pressure medium to at least two hydraulic consumers, which are assigned in each case a directional valve for setting the flow and a setpoint signal source, by means of a pump with a variable displacement, which can be regulated by means of a displacement controller. The pump displacement is regulated according to the flow required by the setpoint signals. The individual load pressure of the consumers and of the consumer having the highest load pressure are determined. The directional valve of the highest loaded consumer is controlled to a valve-spool position y1, with y1=K·y1,max=const., which lies by a factor K, with 0<K<1, below the valve-spool position y1,max representing the maximum opening of the directional valve. This control of the directional valve of the highest loaded consumer has superposed on it at least one dynamic subcontroller which smoothes out pressure fluctuations via the residual opening of the directional valve remaining between the valve-spool positions y1 and y1,max.

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 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 mainpump, at the same time, the invention further can simulate a fluid dynamic-static pressure combined mechanical seal test for the nuclear main pump.

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 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.

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 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 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.

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 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 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 provides an oil-rail pressure closed-loop control based direct jetting method and a system of a combustion engine, which belong to the field of direct jetting type combustion engine. The system is provided with valves and logic control units corresponding to an existing combustion engine, a pressure sensor and a controller. The oil-rail pressure closed-loop control based direct jetting method includes steps of calculating target pressure of an oil rail on the basis of all relative factors, correcting the target pressure of the oil rail by combining with feedforward correcting calculation, acquiring actual pressure of the oil rail according to specific correct time of oil injection, and comparing the target pressure of the oil rail to the actual pressure of the oil rail so as to obtain fluctuation condition of the pressure and adjusting openness of the valve according to the fluctuation condition of the pressure of the oil rail. The pressure of the oil rail can be kept stable by adjusting and controlling the openness of the valve on the basis of comparison of the target pressure and the actual pressure of the oil rail, and thereby the defect that actual oil injection quantity is affected by higher fluctuation of the pressure of an oil injection loop is eliminated.

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 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 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 relates to an injection pump with an inner flow guide structure. An injector, a front vortex cover, an annular liquid guide part, an impeller chamber and a rear vortex cover are sequentially arranged in a pump body from front to back. According to the design, an inner flow guide piece is arranged between the injector and the front vortex cover; a connecting channel is formed in the center of the inner flow guide piece, a partition plate is arranged in the connecting channel, and a plurality of spiral flow guide blades are arranged between the connecting channel and the outer wall of the inner flow guide piece; a spray pipe at the rear end of the injector is internally connected to the connecting channel of the inner flow guide piece; and the impeller chamber communicates with the spray pipe and the connecting channel. The injection pump has the advantages that fluid flows orderly, fluid pressure fluctuation tends to be stable, disordered impact on the interior of the pump body is smaller, loss is reduced, efficiency is higher, noise is lower, and the service life of machine parts is longer.

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 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.

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.

The invention discloses a UPVC (unplasticized polyvinyl chloride) hollow-wall internal spiral tube, relates to internal drainage systems of buildings, and belongs to the technical field of pipeline equipment of internal drainage systems of building materials. The UPVC hollow-wall internal spiral tube is cylindrical. Tube walls of the tube include an internal tube wall (1) and an external tube wall (2), and holes (4) are formed in positions between the internal tube wall (1) and the external tube wall (2); the internal tube wall (1) is a spiral water guide wall (5). The UPVC hollow-wall internal spiral tube has the advantages that the shortcoming of insufficient strength of a common hollow-wall tube can be overcome, the UPVC hollow-wall internal spiral tube is provided with spiral ribs and spiral veins and accordingly is high in strength and low in noise, and a good drainage effect can be realized; air tubes can be omitted when the UPVC hollow-wall internal spiral tube is applied to drainage for a high-rise building, so that spaces, materials and the mounting cost can be saved; the UPVC hollow-wall internal spiral tube is a perfect upgrading and updating product for drainage for modern buildings and is particularly applicable to drainage systems of high-rise buildings.