39results about How to "Reduce oil return" patented technology

The invention belongs to the technical field of center hole pressure accumulation type common rail fuel injectors, and particularly relates to a hydraulic controller of a center hole pressure accumulation type common rail fuel injector. The hydraulic controller comprises a cone ball valve type switching valve, a control sleeve, a control plunger and a spring, the control sleeve, the control plunger and the spring are all arranged in a center hole accumulation cavity at the fuel inlet end of a fuel injector body, one end of the control plunger is inserted into the control sleeve and slidingly connected with the control sleeve, the other end of the control plunger is sleeved with the spring, and two ends of the spring are respectively positioned via one end of the control sleeve and a spring seat arranged at the other end of the control plunger. The cone ball valve type switching valve is arranged on the end portion of the fuel inlet end of the fuel injector body, accommodated in a nut in threaded connection with the end portion of the fuel inlet end of the fuel injector body, and hermetically connected with the other end of the control sleeve. A hydraulic control cavity is arranged between the control plunger and the cone ball valve type switching valve, a fuel inlet orifice communicating the hydraulic control cavity and the middle hole pressure accumulation cavity is formed in the control sleeve, and a fuel outlet orifice communicating the hydraulic control cavity and a low pressure cavity is formed in the cone ball valve type switching valve. The hydraulic controller is simple in structure, low in processing cost and low in requirement on cleanliness of fuel.

The invention discloses a diffusion pump, and particularly relates to a large-caliber high vacuum oil diffusion pump, which is suitable for a vacuum furnace and a vacuum coating machine. The large-caliber high vacuum oil diffusion pump comprises a pump body, and a pump core component arranged in the pump body, wherein a heater is arranged at the bottom of the pump body; an oil stop device is arranged in an exhaust port of the pump body; the pump body adopts a convex cavity structure; the pump core component is vertically mounted in a center oil tank in the pump body, and is formed into an integral structure by a first-stage guide pipe, a second-stage guide pipe and a third-stage guide pipe arranged in sequence from inside to outside; umbrella cap-shaped diffusion nozzles are respectively arranged at the upper parts of all the guide pipes; a spraying nozzle is vertically welded at the bottom of the third-stage guide pipe; the first-stage guide pipe is higher than the second-stage guide pipe; and the second-stage guide pipe is higher than the third-stage guide pipe. The large-caliber high vacuum oil diffusion pump has the characteristics of large caliber, high limit vacuum degree, high pumping rate, low oil return rate and low electricity consumption.

The invention aims to provide a double-valve electronic control fuel injector. The double-valve electronic control fuel injector comprises a fuel injector head, a boosting control valve, a boosting piston, a fuel injection control valve, a nozzle and a fuel injector body. Double solenoid valves are adopted to correspondingly control the boosting process and the fuel injection process to make the fuel injection process of the double-valve electronic control injector not restricted by the boosting process, so the double-valve electronic control injector can work in two modes of non-boosting andboosting; and rail pressure injection is carried out under the non-boosting mode, ultra-high pressure injection is carried out under the boosting mode, and the flexible adjustment of the pressure ratio can be achieved by changing the control strategy of the boosting control valve under the boosting mode, so that the double-valve electronic control fuel injector is higher in reliability and wider in application range. The fuel injection control valve can enable the double-valve electronic control injector to realize micro-dynamic fuel return, the fuel return amount is greatly reduced, the response speed of a needle valve is increased, and the power performance and economy of a diesel engine are effectively improved.

The invention discloses an energy-saving high-pressure common-rail electronic-control oil injector. The energy-saving high-pressure common-rail electronic-control oil injector is characterized in that a high-speed electromagnetic valve is of a built-in structure and is compressed by a butterfly spring, and compressing force on the high-speed electromagnetic valve can be adjusted by the aid of an adjusting gasket; a hydraulic servo mechanism is positioned on the lower portion of the high-speed electromagnetic valve and is mounted inside an oil injector body; a control valve is provided with a positioning plane and a high-pressure sealing spherical surface, so that influence of accumulated machining errors on components can be reduced; a needle valve assembly comprises a needle valve body, a needle valve, a clip type spring seat, a spring and a sleeve. The energy-saving high-pressure common-rail electronic-control oil injector has the advantages that the needle valve body has an oil-passage-free character, and accordingly the production cost can be reduced; a large conical surface is arranged on the top of the needle valve, throttle holes and a circular groove are formed in the upper portion of the needle valve, a small cylinder is arranged in the middle of the needle valve, a spiral groove is formed in the lower portion of the needle valve, a throttle hole is formed in the sleeve, and the sleeve, the needle valve and the needle valve body are matched with one another, so that the electronic-control oil injector is quick in response, free of leakage and low in oil return, power consumption and fuel oil consumption of a high-pressure common-rail diesel engine can be reduced, emission of the diesel engine can be improved, and the energy-saving high-pressure common-rail electronic-control oil injector is particularly applicable to repeated injection common-rail diesel engines.

The invention discloses an electromagnetic variable cam mechanism and a small-fluctuation variable-flow oil supply device. The small-fluctuation variable-flow oil supply device comprises an oil tank and an oil pump, wherein the oil pump is composed of a cylinder body and a piston, an oil inlet of the cylinder body is communicated with the oil tank through an oil inlet valve and a filter, an oil outlet of the cylinder body is communicated with an oil inlet of an electric-control oil injector through an oil outlet valve and a pressure sensor, an oil return port of the electric-control oil injector is connected with an oil return port of the oil tank through an oil return control valve, the lower end of the piston makes contact with a single-action cam or a multi-action cam, and the pressure sensor, the electric-control oil injector, an electromagnetic coil and the oil return control valve are connected with a power source and a controller. According to the small-fluctuation variable-flow oil supply device, the single-action cam or the multi-action cam is selected to be used for changing the oil supply capacity of the oil pump in real time according to the rotating speed working condition and the load working condition of an engine, the amount of returned oil is controlled through the oil return control valve, the amount of returned oil of the oil pump is reduced, and fuel oil supplying efficiency is improved.

The invention discloses a common rail fuel injector, which comprises a fuel injector body part, a solenoid valve part and a fuel injector part. The present invention realizes the fuel injection control function by combining the two-position three-way electromagnetic control valve part and the fuel injection nozzle part with adjustable opening pressure, which makes the structure of the fuel injector simpler and can realize the flexible control of the fuel injection starting point and the fuel injection volume . The electromagnetic control valve core of the present invention is designed as a fuel pressure self-balancing structure, which can significantly improve the fuel injection opening response speed and reduce the driving current of the electromagnet, effectively improving the service life and reliability of the electromagnet. The present invention does not have the structure of the pressure control chamber, the oil outlet orifice control ball valve and the control piston pair of other traditional common rail injectors, so there is no need for precision parts with difficult processing technology, the processing difficulty is greatly reduced, and the process cost is also corresponding reduce.

A differential injection module used on an injection molding machine comprises a mold body. The mold body is provided with an oil inlet, an oil outlet, an oil entering opening, an oil backflow opening, an injection control valve, a one-way valve and a flow control valve, wherein the oil inlet and the oil outlet communicate with an oil tank, the oil entering opening communicates with a push cavity of an injection oil cylinder, and the oil backflow opening communicates with a loosening cavity of the injection oil cylinder. The injection control valve, the one-way valve and the flow control valve are connected with a control circuit through wires correspondingly. The oil inlet, the oil outlet, the oil entering opening and the oil backflow opening communicate with the injection control valve through pipelines correspondingly. The one-way valve is arranged on the pipeline enabling the oil backflow opening to communicate with the injection control valve. The flow control valve is arranged on the pipeline enabling the oil inlet to communicate with the injection control valve. A valve element capable of moving left and right is arranged in the injection control valve. After the valve element moves leftwards / rightwards, the oil inlet communicates with the oil entering opening; and after the valve element moves rightwards / leftwards, the oil inlet communicates with the oil backflow opening. The differential injection module has the beneficial effects that the oil way flow is adjusted conveniently, and the injection oil cylinder is stable in pushing and high in push efficiency.

The invention provides a common rail oil injector capable of reducing leakage. The common rail oil injector comprises an oil cavity A and an oil cavity B, wherein the oil cavity A and the oil cavity Bare formed by a control piston and a pore plate; when the control piston ascends and descends, a high-pressure oil passage communicates with a low-pressure oil passage through two oil passages of theoil cavity A and the oil cavity B. After the lift of the control piston reaches the maximum value, the communication between the oil cavity B and the low-pressure oil passage through a throttling ring belt is cut off, high-pressure oil only passes through a throttling hole and the oil cavity A to be leaked to the low-pressure oil passage through an oil outlet hole, so that the flowing resistanceis increased, and oil return during oil spraying, heating of the oil injector and oil supply pump power loss are reduced. Meanwhile, the flow ratio of the oil outlet hole to an oil inlet hole can be larger, so that the oil drainage time of a control cavity and the oil injection delay of the oil injector are reduced. After the communication of a passage, flowing through the throttling ring belt, between the oil cavity B and the low-pressure oil passage is cut off, and the oil cavity B only communicates with the low-pressure oil passage through the throttling hole and the oil cavity A, so that the flowing resistance of the low-pressure oil passage is increased, and the oil cavity B is kept higher in pressure, the pressure of the control cavity is restored faster after an electromagnetic valve is powered off, the oil spraying closing delay is shorter, and the oil spraying sensitivity of the oil injector is improved.

The invention aims at providing a piezoelectric-electromagnetic bivalve electronic fuel injector. The piezoelectric-electromagnetic bivalve electronic fuel injector comprises a fuel injector head, a booster control valve, a booster piston, a fuel injection control valve, a nozzle, a cap nut and a fuel injector body. The pressurization process and the fuel injection process are controlled by a piezoelectric crystal and an electromagnetic valve respectively, so that the fuel injection process of the piezoelectric-electromagnetic bivalve electronic fuel injector is not restricted by the pressurization process; therefore, the piezoelectric-electromagnetic bivalve electronic fuel injector can work in a non-pressurization mode and a pressurization mode, injection is carried out according to therail pressure in the non-pressurization mode, ultrahigh-pressure injection is carried out in the pressurization mode, flexible adjustment of the pressure ratio can be achieved by changing the controlstrategy of the booster control valve in the pressurization mode, the reliability is higher, and the application range is wider. By means of the fuel injection control valve, the piezoelectric-electromagnetic bivalve electronic fuel injector can achieve micro-dynamic fuel return, the fuel return amount is greatly reduced, the response speed of a needle valve is increased, and the power performanceand economical efficiency of a diesel engine are effectively improved.

Provided is an oil way locking device which comprises a locking device body. The locking device body is provided with an oil inlet, an oil outlet, an oil entrance, an oil returning hole communicated with the back cavity of the oil cylinder, a directional valve and a check valve, both of which are connected with the control circuit by control cables. The oil inlet, oil outlet, oil entrance and the oil returning hole are all communicated with the directional valve. The check valve is provided at the pipe section from the oil returning valve to the directional valve. The directional valve inside is provided with a valve element moving leftward and rightward. The oil inlet and the oil returning hole are communicated. The advantages of the present device is the attainment of the opening and closing operation of the oil tank membrane, excellent locking effects, easy unlocking procedure, high efficiency; the motor control of the directional valve and the check valve with high reaction sensitivity, fast start up; solid locking device body, pipe cavities installed on the solid body communicating with various openings, simple structure and easy processing.