37results about How to "Suppress pressure pulsation" patented technology

The invention relates to the field of heat dissipation, in particular to a micro-channel radiator, integrated manufacturing and an application of the micro-channel radiator in a control array antenna.The radiator is manufactured through 3D printing. Through a fluid channel which is distributed in a gradually changed manner and a liquid injection port and a liquid outlet which are respectively formed at the biggest end and the smallest end of the flow channel, cooling liquid uniformly passes through the whole fluid channel. When the radiator is in use, the highest temperature of the radiator is 298K, the lowest temperature of the radiator is 295K, and the temperature difference after heat dissipation is 3 DEG C. Compared with a pure runner structure, the radiator is stronger in heat dissipation capability and more uniform in temperature distribution after heat dissipation, and has the characteristics of good heat dissipation performance and temperature uniformity, one-time forming, noneed of using a nut sealing ring and the like for packaging.

The invention discloses a flow control device and method for improving ventilation cavitation stability. The flow control device comprises a cavitator, an air guide bowl, a ventilation pipeline, a spiral assembly, a flow controller and the like. High-pressure airflow enters an interlayer through an air inlet hole along a ventilation pipeline, is finally exhausted from an exhaust hole to form swirling airflow and impacts a spiral assembly to make the spiral assembly rotate around a super air bubble underwater vehicle, the flow controller is additionally arranged on a traditional cavitation device, the air in the cavitation device is made to rotate, internal energy of the high-pressure airflow is converted into axial and tangential kinetic energy, and thereby active control over the cavitation form is achieved. The flow control method for improving stability of the ventilation cavitation bubbles is advantaged in that the generation rate of the ventilation cavitation bubbles can be increased, generation of liquid backflow flow in the cavitation bubbles is inhibited, the cavitation bubbles are rapidly generated till the cavitation bubbles wrap the whole underwater navigation body to form a supercavitation state, and thereby frictional resistance of the surface of the underwater navigation body is greatly reduced.

In the hermetically sealed scroll compressor, an injection pipe for injecting a fluid to a compression chamber is connected to an injecting port of a fixed scroll. The injecting port includes a first injecting port which is provided in the vicinity of a fixed scroll inner curve and injects the fluid to an orbiting outer compression chamber, and a second injecting port 22b which is provided in the vicinity of a fixed scroll outer curve and injects the fluid to a orbiting inner compression chamber 8b. The second injecting port is placed in parallel in a radius direction with respect to the first injecting port and is placed so that an orbiting scroll wrap does not practically communicate with the orbiting outer compression chamber in the state in which the orbiting scroll wrap is in contact with the outer side of a fixed scroll wrap.

A resonator (12) for reducing intake air noise is connected to an intake air duct (6) connecting a throttle chamber (5) and an air cleaner case (7). This blow-by gas treatment device is equipped with a fresh air introduction passage comprising a fresh air introduction hose (16), and a blow-by gas passage comprising a blow-by gas hose (20), with the fresh air introduction hose (16) connecting the cylinder head (4) and the resonator (12). A connector part (15) of the resonator (12) to which the fresh air introduction hose (16) is connected is equipped with an orifice (21), which is formed integrally as a part of a synthetic resin lower body (13). Pulsation is effectively reduced by the throttling effect of the orifice (21) and the expansion effect of the resonator (12).

A holding device is used for fastening a fuel distributor to an internal combustion engine. A plurality of holding elements is provided, which are able to be fixed in place on the internal combustion engine via a fastener. A cable guide is provided in addition. The holding elements are connected to the cable guide. In addition, a system having such a holding device and a fuel distributor for conveying fuel are provided.

A fuel-evaporated gas processing system includes an input port taking in evaporated gas evaporated in a fuel tank; output ports supplying the evaporated gas taken in through the input port to an intake system of an engine; a chamber interposed between the input port and the output ports; an electromagnetic valve device including at least first and second electromagnetic valves disposed in the connection between the input port or the output ports and the chamber, either of the input port or the output ports being branched off into a plurality of sections, and perform opening and closing operations in response to a driving signal; and a valve control means driving the first and the second electromagnetic valves of the electromagnetic valve device.

The invention discloses an oil filter capable of controlling pressure fluctuation. The oil filter comprises a base, a filter core mounting sleeve, a filter core and a filter cartridge, wherein the filter core mounting sleeve and the filter cartridge are arranged on the base; the filter core is sleeved on the filter core mounting sleeve; and the filter cartridge is sleeved on the filter core and is used for tightly compressing the filter core. The oil filter is characterized in that: a certain gap is formed between the filter core and the filter cartridge; a copper wire is filled in the gap; and oil which flows into the oil filter flows through the copper wire and the filter core and then flows out of the oil filter. The oil filter capable of controlling the pressure fluctuation can eliminate pollutants in the oil, keep the cleanness of the oil and effectively control the pressure fluctuation, so that the reliability of the whole hydraulic system is improved; in addition, the oil filter has a simple structure, is convenient to machine and is easy to realize.

A burner for a gas combustor and a method of operating the burner are disclosed. The burner includes a front surface area divided into a plurality of subareas and inlets arranged on the front surface area such that each subarea is encircled by at least four inlets and such that during operation of the burner, a gas recirculation in the combustor is facilitated corresponding to each subarea.

The present invention relates to the field of heat dissipation, specifically refers to a microchannel heat sink, integrated manufacturing and its application in control array antennas. The present invention adopts 3D printing to manufacture the heat sink, and through fluid channels with gradually changing distribution, they are respectively arranged in the largest flow channels. The liquid injection port and the liquid outlet port at the smallest end allow the coolant to pass through the entire fluid channel evenly. The maximum temperature of the radiator is 298K and the minimum temperature is 295K during use. Compared with, the heat dissipation ability is stronger, the temperature distribution after heat dissipation is more uniform, and it has the characteristics of good heat dissipation and temperature uniformity, and no need to use nut sealing rings for packaging in one-time molding.

The invention relates to a POGO active suppression method and system based on an overflow valve. The system comprises a pressure sensor, a controller and the overflow valve. The pressure sensor is installed on a high-pressure pipeline behind an engine pump and used for sensing the pressure pulsation condition of fluid in the high-pressure pipeline behind the pump, and a sensed pressure signal is sent to the controller. The controller generates an excitation signal according to the pressure signal and is used for controlling the opening degree of the overflow valve; and the overflow valve is used for adjusting the opening degree and the overflow amount according to the excitation signal sent by the controller, and then the pressure pulsation of the high-pressure pipeline behind the engine pump is reduced.

A method for suppressing combustion pressure pulsation by high-frequency exciting discharge center plasma relates to a method for suppressing pressure pulsation in thermoacoustic oscillation phenomenon. The invention uses the plasma as a dynamic and active way to regulate the pressure pulsation state in the combustion process of the combustion chamber under certain working conditions. The present invention generates plasma at the root of the flame in the combustion chamber, so that the flame is dynamically affected by the plasma and less affected by air flow disturbance, the stability of heat release is correspondingly improved, and the phase and frequency of flame heat release are adjusted, so that The amplification degree of the pulsation energy in the combustion chamber is reduced, and the condition of thermoacoustic oscillation is destroyed, thereby realizing the reduction or even disappearance of the pressure pulsation in the combustion chamber.

The disclosure provides a fuel supply device for suppressing combustion instability, combustion equipment and a control method. The fuel supply device for suppressing combustion instability includes: a fuel tank, a booster pump, and a phase frequency adjustment device; the fuel tank is used to store fuel, and is used to To pressurize the fuel in the pipeline, the phase frequency adjustment device adjusts the frequency and phase of the fuel injected into the combustion chamber in real time according to the phase difference between the fuel in the pipeline and the combustion chamber, and suppresses the pressure pulsation in the combustion chamber. The fuel supply device for suppressing combustion instability provided by the present disclosure measures the phase of the fuel in the pipeline and the combustion chamber in real time by setting the first dynamic pressure sensor and the high-frequency dynamic pressure sensor, and by setting the high-frequency solenoid valve and the phase shifter Adjust the frequency and phase of the fuel supply in real time, so that when the phase difference between the fuel in the pipeline and the combustion chamber is less than 90°, the frequency and phase of the fuel supply can be adjusted in time to effectively suppress the pressure pulsation generated by the combustion in the combustion chamber.

A fuel injection valve includes a needle for opening or closing an injection hole. The needle moves in response to a fuel pressure in a control chamber. The fuel injection valve includes an electromagnetic valve which opens or closes a discharge passage for changing pressure in the control chamber to actuate the needle. A narrow part is provided in the discharge passage. The narrow part is formed to shorten a length along a flow direction. The shortened narrow part can suppress pulsations. Therefore, it is possible to accurately control injection quantity, since a variation of closing speed of the armature caused by the pulsations can be suppressed.

A method for suppressing combustion pressure pulsation by high-frequency excitation discharge side plasma relates to a method for suppressing pressure pulsation in thermoacoustic oscillation phenomenon. The present invention uses side plasma as a dynamic and active way to regulate the pressure pulsation state that occurs during the combustion process of the combustion chamber under certain working conditions. This invention uses dielectric barrier (DBD) discharge to generate plasma on the flame side of the combustion chamber. By adjusting the flame concentration area and changing the distance of the flame main heat release area relative to the combustion chamber outlet, the pressure pulsation in the combustion chamber is reflected from the combustion chamber outlet. The length of the return path changes, and the phase difference between the pressure pulsation and the flame heat release rate changes, which destroys the original conditions for thermoacoustic oscillation, thereby reducing or even disappearing the pressure pulsation in the combustion chamber.

A pulsation damper (1) for damping pressure pulsations of a fluid is insertable into the fluid line as intermediate piece by forming an axial flow channel (3), and the pulsation damper (1) featuring a housing (2). The pulsation damper (1) is characterized by the fact that the housing (2) has at least one hollow space (23) communicating with the flow channel (3) and in which at least one attenuator (4) is disposed movably in axial direction.

The invention discloses a super-slow hydraulic system for a synchro-driven die-forging hydraulic press, mainly consisting of five synchro-driven channels of a driving cylinder, a super-slow driving channel of the driving cylinder, a releasing channel of the driving cylinder, a liquid drainage channel of a return cylinder and a liquid inlet channel of the return cylinder. In the invention, an independent oil source is arranged for each driving channel of the driving cylinder to realize self-adaptive compensation of load pressure of the driving cylinder and flows of different channels are changed according to the openness of a proportional flow control valve for adjusting the position and signal of a plunger of the driving cylinder. The descending speed of a moveable beam is adjusted by controlling start and stop of a fast descending valve set and a slow t descending valve set to realize real time synchronous movement control of the driving cylinder. During super-low driving, the constant front and back pressure difference of a proportional flow valve is ensured by arranging a pressure maintaining valve to output stable flow under super-low working condition. Pressure impact of the oil source is eliminated by arranging an accumulator. The working position of a change valve is changed to realize rapid load removal for the driving cylinder and rapid return of the moving beam.