45 results about "Reciprocating engine" patented technology

A fuel reforming system for a vehicle on which a reciprocating engine is mounted is provided can comprise a decomposer to decompose hydrocarbon fuel into carbon and hydrogen gas by using heat and a pressure of combustion gas and a catalyst and to hold carbon. The decomposer can communicate with a combustion chamber via an openable / closable third port. A reforming space in which a reforming member including the catalyst is installed can be on the side of a connection portion of the decomposer with the third port. On an opposite side of interior of the connection portion of the decomposer with the third port, an additional space is provided to accommodate residual gas that remains in the third port and the decomposer when combustion gas is introduced into the decomposer through the third port.

A fuel reforming system for a vehicle includes a reciprocating engine mounted on a vehicle, a decomposer that decomposes a hydrocarbon fuel into carbon and a hydrogen gas and that stores the carbon, a hydrocarbon fuel supply unit that supplies the hydrocarbon fuel to the decomposer, and a hydrogen gas supply unit that supplies the hydrogen gas into a cylinder. The reciprocating engine performs a cycle including a compression stroke, an expansion stroke, and a re-compression stroke. The decomposer decomposes the hydrocarbon fuel into the carbon and the hydrogen gas utilizing the heat and the pressure of a combustion gas in the re-compression stroke. The decomposer includes a catalyst to which the carbon adheres and a water vapor adsorption portion in which water vapor is adsorbed.

In order to enable improvement with respect to recycling performance, achieve further reduction in weight, and improve environmental performance, a cylinder liner (30) according to the present disclosure has a structure in which, out of an inner face (21i) of a cylinder (21) in a reciprocating engine, the cylinder liner is provided in only a partial region over which a piston ring (50) fit onto a piston (40) that performs reciprocal motion in the cylinder (21) slides, and a liner entire length L along an axial direction of the cylinder (21) is smaller than an inner diameter B of the cylinder, and recessed and protruding forms are formed on one lower end portion (30d) that is an end portion toward a bottom dead center side of the piston ring (50) in the axial direction.

A fuel reforming system includes a reciprocating engine; a decomposer that decomposes a hydrocarbon fuel; and a hydrocarbon fuel supply device. The reciprocating engine includes an intake port, an exhaust port, and a third port that allows a cylinder and the decomposer to communicate and that is opened and closed by an on-off valve. The on-off valve opens in a stroke in which a combustion gas inside the cylinder is supplied to the decomposer with ascending of a piston. The on-off valve opens in a stroke in which a combustion gas, in which the carbon and the hydrogen gas has been removed, is introduced from the third port to the cylinder with descending of the piston. The hydrocarbon fuel supply device injects the hydrocarbon fuel into the third port between the on-off valve and the decomposer during a stroke in which the on-off valve is closed.

A pump system may include a fluid pump including a fluid end. The fluid end may include a plunger configured for reciprocating movement, a suction valve biased to a closed position and configured to open during suction cycles of the fluid pump, and a discharge valve biased to a closed position and configured to open during discharge cycles of the fluid pump.The fluid pump may include a power end configured to drive reciprocating movement of the plunger. The pump system may be configured to variably control a torque requirement of the fluid pump. The pump system may include a reciprocating engine to produce torque to drive the power end of the fluid pump. The pump system may include a fixed-ratio gearbox or a dual-ratio gearbox operably coupling the power end of the fluid pump to the reciprocating engine using a non-fluid coupling.

The invention relates to the technical field of engine crankshafts, and provides a reciprocating engine crankshaft mechanism which comprises a piston, a transmission assembly and an output shaft, and the transmission assembly is composed of a swing arm, a gear ring and a pinion. One end of the swing arm is connected with the piston, and the other end is rigidly connected with the gear ring which is meshed with the pinion in real time to form a power transmission path. Through the structural design of the inner gear ring or the outer gear ring, the conversion from the reciprocating motion of the piston to the continuous rotation of the gear is realized in cooperation with the meshing mode of the standard / eccentric / non-circular gear. The mechanism is in a swing arm hinge type or rigid connection mode, periodic fluctuation of a force arm of a traditional crankshaft mechanism is eliminated through the curve movement characteristic of a gear ring, and it is ensured that the acting force arm keeps stable in the power transmission process. The crankshaft mechanism effectively solves the problem of energy loss caused by the fact that a force arm of a traditional crankshaft mechanism returns to zero near upper and lower dead points, remarkably improves transmission efficiency, reduces vibration and part abrasion, and has the remarkable advantages of improving heat efficiency and operation stability.

A fuel supply system (1) for an internal combustion engine (10) designed as a reciprocating piston engine with a crankshaft and several combustion chambers (11, 12, 13, 14, 15, 16), in particular one powered by hydrogen, comprises a fuel rail (20, 24, 25) to which several fuel injectors (8) are connected via supply lines (22, 23, 28). At least one resonator valve (27, 30, 31) is arranged between the fuel rail (20, 24, 25) and the fuel injectors (8), the latter being designed for actuation depending on the crankshaft angle (α).

Split crankshaft in inexpensive design for reciprocating piston engines with very high operating pressures with undivided connecting rod bearings (6) and undivided crankshaft bearings (8) into which floating bearing rings (9) can be inserted to reduce the difference speed of the bearing surfaces to each other and which can be assembled and disassembled as often as desired.

The invention discloses a qualitative detection method for a loosening fault of a foundation bolt of a reciprocating engine. The qualitative detection method comprises the following steps: step 1, respectively collecting vibration signals of the foundation bolt in a normal state and a fault state in an engine operation state; step 2, obtaining a corresponding speed signal; 3, calculating an average effective value, a difference value and a relative change rate of vibration acceleration signals of the body supporting seat and the foundation in normal and fault states; 4, the average effective value, the difference value and the relative change rate of the vibration speed signals of the body supporting seat and the foundation in the normal and fault states are calculated; 5, the relative change rate of the two feature values is calculated, and whether the engine breaks down or not is judged; 6, calculating an average amplitude spectrum and a difference spectrum of the normal and fault state speed signals; 7, extracting a frequency component, and calculating an energy ratio; and 8, comprehensively judging whether a foundation bolt loosening fault occurs or not. According to the invention, qualitative detection of the loosening fault of the engine foundation bolt can be accurately and efficiently realized.

To provide a fuel reforming system suitable for mounting to a vehicle.SOLUTION: A fuel reforming system 1 includes: a reciprocal engine 3; a decomposition device 6 that decomposes hydrocarbon fuel into carbon and hydrogen gas; and a hydrocarbon fuel supply device (third port injector 46) that supplies hydrocarbon fuel to the decomposition device. The reciprocal engine includes a third port 37 communicating a cylinder 31 and the decomposition device and opened / closed by an on-off valve 38. The on-off valve is opened in a stroke in which combustion gas in the cylinder is supplied to the decomposition device due to lifting of a piston and in a stroke in which the combustion gas from which carbon and hydrogen gas have been removed is introduced from the third port to the cylinder through lowering of the piston. The hydrocarbon fuel supply device injects hydrocarbon fuel into the third port between the on-off valve and the decomposition device in a stroke in which the on-off valve is closed.SELECTED DRAWING: Figure 4

A reciprocating piston with exhaust valve suitable for power generation are disclosed. In particular, a reciprocating engine especially suited for the combustion of pressurized hydrogen gas with specific advantages that make it better suited for very large displacement engines is disclosed.

A reciprocating engine fault diagnosis method based on a multi-source angular domain envelope-operating characteristic joint diagram comprises the steps that firstly, vibration signals of the same key positions of all cylinders of an engine and key phase signals of a crankshaft are collected, and all pulse triggering positions in the key phase signals are obtained; secondly, envelope processing and truncation processing are carried out on the vibration signals, an angular domain abscissa sequence is constructed, and conversion of the vibration signals from a time domain to an angular domain is achieved; sequencing the signals of all the measuring points according to the ignition sequence of all the cylinders of the engine; and finally, in combination with the working characteristics of the engine, constructing a multi-source angular domain envelope-working characteristic joint diagram, and marking the working state of the part corresponding to each impact moment. According to the method, deep fusion of the multi-source vibration signals, the angular domain information and the engine working characteristic information is realized, the engine vibration impact characteristics can be quickly and accurately associated with the working states of the key parts, and the engine fault analysis efficiency and accuracy are remarkably improved.

A system is provided. The system includes a reciprocating engine configured to consume oil at or less than 0.25 g / kw-hr and use makeup oil. The reciprocating engine includes an engine oil sump. The system is configured to maintain the oil volume in the reciprocating engine during operation such that the residence time of the oil in the reciprocating engine is at or less than 1000 hours.

In order to enable improvement with respect to recycling performance, achieve further reduction in weight, and improve environmental performance, a cylinder liner (30) according to the present disclosure has a structure in which, out of an inner face (21i) of a cylinder (21) in a reciprocating engine, the cylinder liner is provided in only a partial region over which a piston ring (50) fit onto a piston (40) that performs reciprocal motion in the cylinder (21) slides, and a liner entire length L along an axial direction of the cylinder (21) is smaller than an inner diameter B of the cylinder, and recessed and protruding forms are formed on one lower end portion (30d) that is an end portion toward a bottom dead center side of the piston ring (50) in the axial direction.

The present invention discloses a starting control method, device and engine system for a reciprocating piston engine. The reciprocating piston engine includes an air storage tank, a main starting valve, at least two sub-starting valves and at least two cylinders; each cylinder corresponds to a sub-starting valve; each cylinder is connected to the main air delivery passage of the air storage tank through a sub-air delivery passage; the main starting valve is arranged on the main air delivery passage, and each sub-starting valve is arranged on the sub-air delivery passage connected to its corresponding cylinder; each cylinder includes a piston, and each piston is connected to the engine crankshaft through a transmission mechanism; a pressure sensor is installed on the air delivery passage, and an angle sensor is installed on the engine crankshaft; the starting control method includes: controlling the main starting valve to open; repeatedly executing the starting process until the engine starting condition is reached; closing the main starting valve and each sub-starting valve, which can reduce the usage amount of compressed air, and thus can reduce the volume of equipment such as the air storage tank and reduce the cost.

To provide a vibration damping structure for an engine capable of effectively damping vibration in a multi-cylinder reciprocating engine.SOLUTION: An engine includes a plurality of cylinders disposed in series. The engine also includes: a plurality of pistons; a crank shaft; a cylinder block having a plurality of crank journal parts that journal the crank shaft; and a dynamic damper 80 mounted to a lower part of at least one of the crank journal parts in the cylinder block. The dynamic damper 80 integrally includes: a fixation part 800 mounted to a lower part of the crank journal part and extending downwardly in a Z direction; and a beam part 801 connected to a lower part of the fixation part 800 and extending in an X direction; and two mass parts 802, 803 connected at connection parts 801a, 801b on one side and the other side in the X direction of the beam part 801, respectively and each extending in a Y direction while separating from each other in the X direction.SELECTED DRAWING: Figure 3

A compressor-engine assembly (302) comprises a compressor (10) and a reciprocating engine (304), the compressor (10) being arranged to be powered by the engine (304); wherein the engine (304) has an engine imbalance when operating. The compressor (10) is arranged with a compressor imbalance when operating, at least partly mitigating the engine imbalance.

A lubricating oil supply device according to an embodiment is configured to: transfer an ammonia-containing lubricating oil from a reciprocating engine that operates by using ammonia as fuel; separate ammonia from the ammonia-containing lubricating oil; and transfer the lubricating oil, from which the ammonia has been separated, to the reciprocating engine.

An improved reciprocating engine with compound expansion suitable for power generation and in particular a reciprocating engine with compound, or secondary, expansion, especially suited for the direct injection of fuel and oxidizer for higher efficiency, carbon sequestration, and Nox reduction in large displacement combustion engines.

The invention relates to a reciprocating internal combustion engine with direct injection operating according to a modified Otto or Diesel cycle in order to re- duce the operating temperature, when maximum power is not required, with a consequent reduction in heat loss. The engine subject of the invention absorbs minimal power in the suction phase and makes it possible, when maximum power is not required, to increase the compression ratio and consequently the efficiency. The engine subject of the invention provides, for each cylinder, the use of two check valves in the suction pipe and a motorized inlet valve whose opening cycle varies according to the required power. According to a variant of the engine subject of the invention, the latter allows the replacement of the re- sidual burnt gases present in the combustion chamber of each cylinder with air and recirculated gases, pre-loading one of the two check valves mentioned above. The engine subject of the invention therefore allows the replacement of the residual burnt gases with air in order to further reduce the operating tem- peratures of the engine at the same required power, or to increase its filling, and therefore the power, at the same operating cycle.

The present invention realizes a saddle-riding type electric vehicle capable of reducing loss of power due to compression of air in a cylinder, while generating intake sound, exhaust sound, and vibrations similar to those of a reciprocating engine by means of the power of a motor that drives a driving wheel. A saddle-riding type electric vehicle 1 has: a crankshaft 16 configured to reciprocate a piston 14 between a first position P1 and a second position P2, which is located farther from a cylinder head 12 than the first position P1, and to transmit power to a rear wheel 7; an intake valve 17; an exhaust valve 18; and a motor 19 that rotates the crankshaft 16. The degree of opening of the intake valve 17 is adjusted so that air passes through an intake port in a second stroke S2 in which the piston 14 moved to the first position P1 moves to the second position P2. The degree of opening of the exhaust valve 18 is adjusted so that air passes through an exhaust port in a first stroke S1, the second stroke S2, a third stroke S3, and a fourth stroke S4.

A reciprocating engine using ammonia as fuel includes: a cylinder forming a combustion chamber; an exhaust passage that discharges exhaust gas from the combustion chamber; an exhaust gas treatment device which is provided in the exhaust gas path and treats unburned ammonia; a piston which reciprocates in the cylinder; a crankshaft connected to the piston; a crankcase which accommodates the crankshaft and into which blow-by gas flows from the combustion chamber; and a suction device for performing negative pressure suction in the crankcase, in which unburned ammonia contained in the blow-by gas sucked from the crankcase by the suction device is treated by the exhaust gas treatment device.

Provided is a multi-stage injection method for ammonia fuel in an engine cylinder. This method combines the environmental conditions at each stage in the cylinder and realizes the injection of ammonia fuel in stages. When the temperature in the engine cylinder is higher than the boiling point of liquid ammonia, flash boiling injection is adopted for liquid ammonia to reduce the liquid phase penetration distance at low back pressure and avoid hitting the wall, realizing rapid heat absorption and reducing the compression work. When the environmental pressure in the engine cylinder is less than the critical pressure of ammonia, compressed liquid atomization injection is adopted for liquid ammonia, which can increase the liquid phase penetration distance under high back pressure and make full use of the cylinder space in a large-bore internal combustion engine. When the environmental pressure in the engine cylinder is greater than the critical pressure of ammonia, fuel transcritical injection is adopted for liquid ammonia, enabling the ammonia fuel to evaporate rapidly and mix with the surrounding air. The above method can make full use of the physical and chemical properties of ammonia and enable the efficient use of ammonia fuel in a reciprocating engine.

A system includes a condensate injection system configured to fluidly couple to a combustion chamber of a reciprocating engine and an exhaust gas recirculation (EGR) system of the reciprocating engine. The condensate injection system includes a condensate tank configured to store condensate collected from the EGR system. The condensate injection system also includes a pump fluidly coupled to the condensate tank. The condensate injection system also includes an injector fluidly coupled to the pump. The injector is configured to inject condensate into the combustion chamber during a first portion of an engine cycle of the reciprocating engine. The first portion of the engine cycle includes at least part of a power stroke and / or an exhaust stroke of the engine cycle.

The invention relates to the technical field of engine crankshafts, and provides a reciprocating engine crankshaft mechanism which comprises a piston, a transmission assembly and an output shaft, and the transmission assembly is composed of a swing arm, a gear ring and a pinion. One end of the swing arm is connected with the piston, and the other end is connected with the gear ring which is meshed with the pinion in real time to form a power transmission path. Through the structural design of the inner gear ring or the outer gear ring, the conversion from the reciprocating motion of the piston to the continuous rotation of the gear is realized in cooperation with the meshing mode of the standard / eccentric / non-circular gear. According to the mechanism, periodic fluctuation of a force arm of a traditional crankshaft mechanism is eliminated through swing arm hinging, combined connection, rigid connection and the like by means of the curve movement characteristic of a gear ring, and it is ensured that the acting force arm keeps stable in the power transmission process. The crankshaft mechanism effectively solves the problem of energy loss caused by the fact that a force arm of a traditional crankshaft mechanism returns to zero near upper and lower dead points, remarkably improves transmission efficiency, reduces vibration and part abrasion, and has the remarkable advantages of improving heat efficiency and operation stability.

An engine comprises a central main output shaft, flywheels arranged at the two ends of the central main output shaft, opposed air cylinders, a power transmission mechanism, a transmission mechanism and a plurality of power units linked with the opposed air cylinders, and the power units are evenly arranged around the axis of the central main output shaft in the circumferential direction; wherein each power unit comprises a piston, the pistons on the two sides of the opposed cylinders are coaxially opposite in pairs, and a hedging structure is formed in the opposed cylinders; according to the reciprocating engine, a crank connecting rod structure of a traditional reciprocating engine is removed, cylinder body circumferential uniform distribution and piston hedging arrangement are adopted, bidirectional stress of the system is balanced, and therefore the reciprocating engine has the advantages of being high in reliability, high in reliability and high in reliability. The whole machine is small in vibration, stable in operation and long in service life.

To provide a vibration damping structure for an engine capable of effectively damping vibration in a multi-cylinder reciprocating engine.SOLUTION: An in-line six-cylinder engine 1 includes: six pistons 11-16; a crank shaft 30; a flywheel 52 fixed to a rear end of the crank shaft 30; a lower cylinder block 60 having seven crank journal parts 61-67 that journal the crank shaft 30; and a dynamic damper 80 mounted to at least one of lower parts between #2 to #4 cylinders 1b-1d in the lower cylinder block 60.SELECTED DRAWING: Figure 2

The present disclosure provides a system including an engine head mounted to an engine block of a reciprocating engine, and the engine head includes an intake flow passage, an exhaust flow passage, a coolant flow passage, and a first seal register and a second seal register disposed on opposite sides of the coolant flow passage. Further, the first and second seal registers are configured to receive a valve guide for supporting a valve stem of an exhaust valve. Further, the first seal register is disposed in a wall that separates the exhaust flow passage from the coolant flow passage. Further, a first wall portion of the wall extends between the first seal register and an exhaust valve seat configured to receive a valve head of the exhaust valve, and a second wall portion of the wall extends from the first seal register away from the first wall portion.

Provided are methods and systems to generate power from hydrogen in a hybrid hydrogen power generation system including two or more different hydrogen power generation systems. In some examples, electricity may be generated to power oilfield equipment by hydrogen fuel cells and / or by solid oxide fuel cells. Electricity may also be generated to recharge an energy storage for future electricity use. Hydrogen may also be injected directly into an internal combustion engine powering oilfield equipment such as a turbine and / or a reciprocating engine to lower hydrocarbon-based fuel consumption.

The present invention relates to an engine piston cooling and lubrication structure, comprising a piston head cooling and oscillating oil chamber, an internal piston oil passage, an engine body oil inlet passage, a piston sidewall transverse oil groove, and a piston sidewall longitudinal oil groove. No additional components are required; only the longitudinal oil groove, transverse oil groove, and internal oil passage are machined on the piston sidewall. Cooling and lubricating oil can then communicate with the engine body oil passage and the machined piston oil passage to reach the lubricating oil cylinder wall, the piston head, and the connecting rod bushing, achieving cooling and lubrication. Furthermore, the cooling and lubricating oil quantity and pressure can be distributed according to different requirements by designing oil passages with different cross-sectional areas. The cooling and lubricating oil can accurately and fully reach the target locations, resulting in excellent cooling and lubrication effects. The structure can be used as a solution to piston erosion and cylinder scuffing caused by factors such as high piston temperature and in-cylinder detonation in reciprocating engines.