1519 results about "Oil intake" patented technology

The invention discloses a system and method for testing flow, displacement and hydraulic power of a main valve element. The system comprises two displacement sensors, a tested balance valve and a hydraulic testing assembly. A main valve core and a pilot valve core of the tested balance valve are coaxially and oppositely arranged; the two displacement sensors are coaxially fixed with the main valve core and the control piston respectively; the hydraulic test assembly detects the pressure of an oil return port A, a load oil port B, a feedback spring cavity pressure measuring port Pc and a pilot oil inlet X through pressure sensors; the load pressure, the pilot pressure and the oil return back pressure are controlled through a main load oil way, a pilot control oil way and an oil return back pressure oil way respectively, and meanwhile the flow of the oil return is measured through a flow meter. According to the invention, the flow, displacement and hydraulic force of the main valve core under different working conditions can be synchronously and dynamically measured.

The invention relates to an oil flow guide structure, a cooling device and a transformer coil, and is applied to the field of oil-immersed transformers. The oil guide assembly comprises a plurality of oil guide supporting strips, and the oil guide supporting strips can extend in the first direction and are attached to at least one side wall of a coil of the transformer; an oil guide cavity is formed in the oil guide supporting strip, an oil inlet used for inputting cooled insulating oil is formed in the oil inlet end of the oil guide supporting strip, an oil outlet is formed in the side, close to the closed end, of the surface of the oil guide supporting strip, and the oil outlet is used for conveying oil in the oil guide cavity to an upper coil of a transformer coil. According to the cooling device, the semiconductor chilling plate is used for generating cooled insulating oil, the cooled insulating oil is input into the oil guide cavity from the oil inlet and conveyed to the hot spot area of the upper coil of the transformer through the oil outlet communicated with the oil guide cavity, the cooled insulating oil is mixed with oil flow flowing in the upper coil, and therefore the average temperature of the oil flow is reduced, and the cooling efficiency is improved. Meanwhile, the oil flow is increased, and the heat dissipation capacity of the hot spot area of the upper coil of the coil is enhanced.

The invention relates to the technical field of hydraulic servo control, in particular to an integrated hydraulic execution device and method based on self-correcting force-displacement coupling, and the device comprises a hydraulic cylinder, a servo valve, a one-dimensional force sensor, a displacement sensor, an oil inlet pressure sensor, an oil outlet pressure sensor and an edge calculation unit; wherein the servo valve is mounted at an oil inlet of the hydraulic cylinder; the one-dimensional force sensor is mounted at the end of a hydraulic cylinder piston rod; the displacement sensor is arranged in the hydraulic cylinder barrel; the oil inlet pressure sensor and the oil outlet pressure sensor are respectively mounted at an oil inlet and an oil outlet of the hydraulic cylinder; the edge calculation unit is integrated on the outer wall of the hydraulic cylinder and is connected with all the sensors and the servo valve through signal lines; wherein the edge calculation unit operates a self-correcting force-displacement coupling control algorithm, residual error characteristics of all sensors are used as input, the corrected opening degree of a servo valve is output in real time, and closed-loop accurate control over the hydraulic cylinder is achieved.

The invention provides an integrated device and method for adjusting the air flow and heat of an aero-engine, and relates to the field of aero-engines. In the device, an air path shell is connected with an oil path shell, the first connecting end of a piston rod is connected with a main valve element through a connecting base, and the second connecting end of the piston rod is connected with the first connecting end of a piston; a third connecting end of the piston rod is connected with the linear displacement sensor; a second connecting end of the piston is in contact with the interior of the left valve sleeve; an oil inlet of the oil way shell is connected with an input oil port of the electro-hydraulic servo valve, an oil return port of the oil way shell is connected with an oil return port of the electro-hydraulic servo valve, the first working oil port is connected with the left valve sleeve, and the second working oil port is connected with the right valve sleeve. The adjusting method comprises the steps of air heat adjusting and air heat flow simultaneous adjusting. The flow and heat of air entering the air compressor can be distributed to prevent an aero-engine from freezing and surging, meanwhile, high-temperature gas is prevented from directly heating an oil way, and the requirements for light weight and integration of the aero-engine are met.

An overload protection device of a rotary cultivator is simple in structure, an overflow valve is mounted on an oil supply pipeline of a hydraulic motor, and when a rotary blade or a rotary blade shaft touches an obstacle which cannot be cut off, hydraulic pressure at an oil inlet of the hydraulic motor is increased suddenly, so that the overflow valve is opened to quickly release pressure, and the rotating speed and torque of the hydraulic motor are quickly reduced; therefore, impact is buffered, overload protection is achieved, and the rotary blade and the blade shaft can be protected. Meanwhile, after the rotary blade can rotate at a low speed to bypass an obstacle, the oil supply management hydraulic pressure is lowered, the overflow valve is closed, so that normal oil supply to the hydraulic motor is recovered, the working state of the rotary blade can be automatically recovered, manual operation is not needed, use is very convenient, and efficiency is high. In addition, a buffering assembly can be additionally arranged, the transmission tile is driven to be far away from the cutter shaft through hydraulic force generated when the oil pressure of the oil supply pipeline is increased suddenly, and therefore power between the rotary blade or the cutter shaft and the hydraulic motor is rapidly disconnected, impact force is rapidly buffered, and overload protection performance is further improved.

A safe valve can work stably in high and low temperature environment. It relates to the field of safe valve. The existing safe valve causes the steel ball to be stuck due to unreasonable structure, which seriously affects the normal operation of the lubricating oil system. The utility model discloses a safe movable shell, a nut, a sealing ring, a spring, a steel ball, a spring seat, an oil inlet and an oil outlet. The safe movable shell is provided with an oil inlet and an oil outlet respectively. The safe movable shell is fixedly connected with the nut. The sealing ring is arranged between the safe movable shell and the nut. The spring seat is arranged on the end of the nut close to the steel ball. The spring seat is connected with the safe movable shell and the nut respectively. The spring is arranged between the spring seat and the steel ball. The steel ball is assembled in the oil inlet of the safe movable shell through clearance fit and between the spring. The steel ball is pushed by the lubricating oil pressure. The steel ball pushes the spring to compress the spring. The opening and closing of the oil inlet by the steel ball are realized. The utility model is applied to the field of safe valve of lubricating oil system.

The utility model provides a bearing oil circulation lubricating device which comprises a main positioning seat and a sealing outer lining, a set of fixing bases used for supporting the lower end of the main positioning seat are arranged at the lower end of the main positioning seat, and a set of rear positioning shells used for positioning the rear side of a bearing to be lubricated are arranged on the rear side of the main positioning seat. Compared with the prior art, the lubricating bearing positioning device has the advantages that the front sealing plate and the rear sealing plate are fixedly connected with the corresponding sealing linings through the bolts, so that the lubricating bearing positioning device is simple in structure and convenient to use, and the service life of the lubricating bearing positioning device is prolonged. And meanwhile, the rear sealing embedding seat is tightly attached to the rear side of the front sealing plate to enhance the sealing performance, during lubricating operation, lubricating oil is injected from an oil inlet, oil liquid is evenly diffused to a bearing raceway through an oil guide cavity, the inner embedded positioning ring ensures that an oil way is smooth, the sealing outer lining and the sealing inner lining act synergistically to prevent the oil liquid from leaking, and redundant oil liquid flows back to a circulating system from an oil outlet.

The utility model discloses a locking hydraulic oil cylinder with controllable extrusion depth, which relates to the technical field of hydraulic oil cylinders and comprises an oil cylinder, an adjusting bin, an adjusting block and a threaded rod, an oil outlet is arranged on one side of the top of the oil cylinder and communicated with the inside of the oil cylinder, and an oil inlet is arranged on one side of the bottom of the oil cylinder and communicated with the inside of the oil cylinder. The oil inlet is communicated with the interior of the oil cylinder, a piston is arranged in the oil cylinder, the second gear is driven to rotate by rotating the rotary knob, and then the two first gears meshed with the second gear are driven to rotate synchronously. When the first gear rotates, the two threaded rods connected with the first gear are driven to rotate, and the rotation of the threaded rods further drives the adjusting block to move in the axial direction; in the sliding process of the piston, the rod body drives the limiting block to move synchronously, and the adjusting block can limit the stroke of the limiting block; when the limiting block is in contact with the adjusting block, the piston stops moving, so that accurate limiting of the stroke of the piston is realized, and the extrusion depth of the other end of the rod body is accurately controlled.

The invention relates to the field of gearboxes, in particular to a precise forced lubrication structure and method for a gear pair of a gearbox. Comprising an upper cover, fixed spraying holes and a plurality of shifting fork shafts. A lubricating oil channel is arranged in the upper cover and provided with an oil inlet communicated with an external oil source. The fixed spraying holes are formed in the upper cover and communicated with the lubricating oil channel, and lubricating oil is continuously sprayed to a long meshing gear pair in the gearbox. The multiple shifting fork shafts are installed on the gearbox, and an in-shaft oil duct extending in the axial direction is arranged in each shifting fork shaft. The upper cover is further provided with upper cover spraying holes corresponding to the shifting fork shafts, and the upper cover spraying holes are communicated with the lubricating oil channel. Each shifting fork shaft is provided with a shaft spraying hole, and the shaft spraying holes are communicated with the corresponding in-shaft oil way fluid. According to the invention, the problem of insufficient lubrication of key parts caused by ineffective dissipation of lubricating oil by an irrelevant gear pair is solved, and the lubrication reliability and heat dissipation efficiency of the key gear pair are greatly improved.

This application provides an integrated oil-cooled structure, an electric drive system, and a vehicle. The system includes an oil cooler with an internal bypass oil passage, and an oil inlet and outlet connected to the bypass oil passage. A bypass valve includes a valve core assembly and a connector. At least a portion of the valve core assembly is located within the bypass oil passage. One end of the connector is connected to the valve core assembly, and the other end abuts against the bypass oil passage. The valve core assembly is located on the bypass oil passage near the oil inlet. When the amount of oil entering the bypass oil passage through the inlet does not exceed a preset value, the bypass oil passage is in a conducting state. When the amount of oil exceeds the preset value, the valve core assembly moves to switch the bypass oil passage to a closed state. This integrated design minimizes the overall structure and reduces the number of oil passages and interface seals.

This utility model belongs to the field of crane technology, specifically a crane for large water meter testing. It includes a crane body with an oil tank fixedly attached to its top. The oil tank has an oil inlet at its top. A first oil pump is connected to the side wall of the oil tank. A connecting plate is connected to the bottom of the first oil pump. Multiple brushes are fixedly attached to the bottom of the connecting plate. The brushes are arranged through the crane body. A fixing plate is provided at the bottom of the crane body. A first servo motor is fixedly attached to the side wall of the fixing plate. A drive wheel is fixedly attached to the output end of the first servo motor. The drive wheel and the crane body are in a rolling connection. The brushes and the drive wheel are correspondingly arranged. A cable reel is fixedly attached to the bottom of the fixing plate. A second servo motor is fixedly attached to the side wall of the cable reel. A pair of lifting ropes are slidably connected to the bottom of the cable reel. A hook is fixedly attached to the bottom of the lifting ropes. Multiple first circular holes are opened inside the crane body.

The invention provides a lubricating structure of an electric drive system, the electric drive system and a vehicle. The lubricating structure comprises an oil pumping pipeline, a lubricating oil pump, a lubricating oil pump and a lubricating oil pump, wherein an oil inlet of the oil pumping pipeline is communicated with an oil pan in a speed reducer shell; the first oil duct is arranged on the speed reducer shell, an inlet of the first oil duct is communicated with an oil outlet of the oil pumping pipeline, a first outlet of the first oil duct is opposite to the differential shell, and the differential shell is provided with a lubricating window; the second oil duct is arranged on a second gear shaft of the second planet row, the second planet row is arranged in the differential mechanism shell, an inlet of the second oil duct is arranged close to the lubricating window, and an outlet of the second oil duct is communicated with a first gap between the second gear shaft and the second planet gear; the width of the second gear ring of the second planet row is larger than that of the second planet gear. According to the scheme, the technical problem of how to improve the cooling and lubricating effects of the coaxial speed reducer is solved.

This invention provides a hydraulic control system for a concrete placing boom, comprising a hydraulic oil tank, an oil supply pump unit, a main hydraulic pressure pipeline, a main return hydraulic pipeline, and at least one hydraulic actuator unit. The oil supply pump unit is located on the main hydraulic pressure pipeline. Each hydraulic actuator unit includes a hydraulic cylinder and a control valve assembly. The control valve assembly is located close to the hydraulic cylinder, or integrated onto the hydraulic cylinder. The control valve assembly includes a main directional valve, a standby directional valve, and a balance valve assembly. The inlet ports of the main directional valve and the standby directional valve are respectively connected to the main hydraulic pressure pipeline. The return ports of the main directional valve and the standby directional valve are respectively connected to the main return hydraulic pipeline. The outlet ports of the main directional valve and the standby directional valve are respectively connected to the hydraulic cylinder via the balance valve assembly. This invention also provides a control method for the hydraulic control system of the concrete placing boom and a concrete placing boom device.

The application discloses a multi-stage priority liquid filling valve and belongs to the technical field of hydraulic control valves of engineering vehicles.The valve adopts a modularized superposition structure, is composed of a liquid filling valve part and a steering priority valve part which are superposed upward and downward, is communicated through three internal oil channels, integrates a main overflow valve, a steering priority valve, a liquid filling priority valve, a liquid filling pressure regulating valve, a throttling check valve and a shuttle valve, realizes three-stage hydraulic oil supply control of steering highest priority, brake liquid filling secondary priority and working system lowest priority, and is provided with the main overflow valve at an oil inlet to realize system overpressure protection.The problems of complex priority control, incompatible load sensing and constant flow systems of valve parts, need of external main overflow valve, low universality, high development and use costs and the like are solved when a single pump source supplies oil to three or more systems.

A brushless fuel pump comprises a machine shell, a pump assembly and an upper end cover are arranged at the two ends of the machine shell, riveting rings are integrally arranged at the two ends of the machine shell, the machine shell is fixedly connected with the pump assembly and the upper end cover through the riveting rings in a pressing riveting mode, the connecting mode is simple and reliable, the structural strength is high, and the sealing performance and integrity of a pump body in the high-pressure working environment can be effectively guaranteed; a brushless motor is arranged in an inner cavity of the machine shell and comprises a support, a rotor is arranged in the support in a rotating mode, a plurality of inner stator punching sheets with winding wires are arranged on the side wall of the inner side of the support, the outer side of the support is sleeved with outer stator punching sheets, and the outer stator punching sheets are arranged on the outer side of the outer stator punching sheets. A structure that an inner stator punching sheet and an outer stator punching sheet are combined is adopted, optimization of a magnetic field and improvement of motor torque and efficiency are facilitated, the pump assembly comprises a wheel shell, an impeller connected with a rotor is arranged in the wheel shell, an oil inlet is further formed in the wheel shell, and an oil outlet communicated with an inner cavity of the support is formed in the upper end cover.

The utility model relates to a bearing lubricating structure of a wind power gear box. According to the technical scheme, a main shaft is arranged in the gearbox, the right end of the main shaft is fixedly sleeved with one end of a magnetic coupling, the magnetic coupling comprises an inner rotor, the periphery of a box shell outside the inner rotor is movably sleeved with an outer rotor, a rotating shaft is fixedly inserted into the right end of the outer rotor, and the rotating shaft is fixedly arranged on a rack in a sleeving mode through a bearing. The rear end of the infusion pump is fixedly installed on the machine frame, an oil discharge outlet in the upper portion of the right end of the infusion pump is connected with a liquid injection pipe in a sealed mode, the left end of the liquid injection pipe is communicated with a lubricating pipe opening in the gearbox, an oil inlet in the lower portion of the left end of the infusion pump is communicated with an oil storage tank on the lower portion through a pipeline, and the oil storage tank is installed on the machine frame. The shaft seal has the advantages that magnetic transmission is achieved, an external power source is not needed, energy is saved, meanwhile, the problem of leakage of a traditional shaft seal is solved, the rotating speed of the infusion pump is synchronous with the main shaft, and lubricating flow is automatically adjusted along with changes of loads of a gearbox.

The utility model discloses a horizontal scroll compressor, air conditioner and vehicle for vehicle, horizontal scroll compressor includes: compression part, and compression part includes compression cavity, oil separation shell, and oil separation shell is connected with compression part, and oil separation shell is equipped with oil separation chamber and oil storage chamber, oil separation shell is equipped with first groove body towards the side of static scroll, and static scroll seals first groove body, and oil separation shell is equipped with the first batten in first groove body, and the inner wall of first groove body and static scroll are limited to the oil outlet channel between first batten, and the oil inlet of oil outlet channel communicates with oil separation chamber, and the oil outlet of oil outlet channel communicates with oil storage chamber, and the oil outlet is located above the oil inlet, the utility model provides horizontal scroll compressor, and the oil outlet channel is by the inner wall of first batten, first groove body and static scroll and is commonly limited to, and the inner wall of oil outlet channel has enough strength.

The utility model discloses an integrated type swing cycle pump lubricating device, including pump casing, inner rotor and outer rotor, be provided with oil cavity and with oil inlet and oil outlet of oil cavity communication on the pump casing, its characterized in that, the bottom of oil cavity is provided with annular unloading groove with oil outlet communication, and the bottom surface of annular unloading groove is multistage step surface. This integrated type swing cycle pump lubricating device can effectively buffer fluid resistance and pulsation, reduce cavitation and cavitation erosion phenomenon, and stabilize oil pressure of oil outlet.

A self-regulating temperature float-type fuel tank, relating to the field of engine fuel tank technology, includes a tank body with an oil inlet at the top and an oil outlet at the bottom. Inside the tank body are a heater, a temperature sensor, and a cooling core. The heater and cooling core are horizontally positioned above the oil outlet, and the temperature sensor is positioned close to the oil outlet. The cooling core includes several cooling pipes and several clamping plates, which are vertically spaced. The cooling pipes pass horizontally through the clamping plates, and their two ends are connected to the tank body. Water inlets and outlets, communicating with the interior of the cooling pipes, are installed on the side walls of the tank body. The water inlets are connected to a water pump. This application can change the original cooling method, improve cooling efficiency, reduce engine output loss, adjust engine power output in a timely manner, and improve user experience.

The utility model relates to the technical field of jacks, and discloses an oil leakage prevention hydraulic jack which is characterized in that steel balls are connected to the outer walls of mounting rods on the two sides, first springs are arranged outside the mounting rods on the two sides, and connecting blocks are connected to the interiors of a first oil inlet and a second oil inlet; according to the oil leakage prevention hydraulic jack, when the piston block moves upwards, due to the fact that the lower portion of the sealing cover is fixed to the sealing sleeve, the sealing sleeve can contract along with the piston block, and the piston block can be prevented from leaking out of the piston block. In this way, the upper end of the pump body can be completely sealed through the sealing cover and the sealing sleeve, oil leakage of the pump body is effectively prevented, secondly, hydraulic oil is prevented from leaking from the abutting joint position of the piston rod and the inner wall of the cylinder body through the arrangement of the oil sealing rings on the two sides, backflow of the hydraulic oil during use is avoided, and therefore the safety and reliability of the hydraulic jack can be greatly improved.

The application provides a leakage oil treatment method for a safety disc brake of an aerial passenger device, which mainly adds a structure for preventing oil leakage on a piston and a cylinder cover, and cooperates with a cylinder to collect the leakage oil, so as to solve the problem that the brake slips and loses braking force when working due to the leakage of pressure oil on the brake disc; the application sets an oil inlet leakage oil collection pool on the piston to collect the leakage oil at the oil inlet, sets an oil seal leakage isolation groove to accumulate the leakage oil, sets a residual oil pool on the cylinder cover to collect the leakage oil at the oil seal, and cooperates with the cylinder to discharge the leakage oil without contaminating the brake disc, so that the safety disc brake of the aerial passenger device cannot lose braking force due to the overflow of the leakage oil; and the application realizes the safety disc brake of the aerial passenger device without leakage and with high reliability by using a smaller cost.

The utility model discloses an intelligent quantitative oil bottle which comprises a bottle body, a bottle cap, an electric pump, a battery and a control circuit, the bottle cap comprises a hollow part cavity, the electric pump and the battery are arranged in the part cavity, the upper portion of the bottle cap comprises an oil outlet nozzle, and an oil inlet pipe of the electric pump penetrates through a bottom plate of the bottle cap to be inserted into an inner cavity of the bottle body. An oil inlet of the oil inlet pipe is located on the lower portion of an inner cavity of the bottle body, an oil outlet of the electric pump oil outlet pipe is connected with an oil outlet nozzle on the upper portion of the bottle cap, the control circuit comprises a controller, a keyboard and an electric pump driving circuit, and a power input end of the electric pump driving circuit is connected with a battery and an output end of the electric pump driving circuit. The control end of the electric pump driving circuit is connected with the controller; the keyboard comprises an oil outlet quantity adding and reducing key, and the signal output end of the oil outlet quantity adding and reducing key is connected with the adding and reducing signal input end of the operation duration of the electric pump of the controller. According to the utility model, the oil outlet quantity is controlled by increasing or decreasing the running time of the electric pump, and the oil outlet quantitative adjustment precision is high.

The utility model provides a kind of servo valve flow channel and servo valve, including valve core and valve sleeve;The servo valve flow channel includes the passage being set in the valve body inside servo valve, including inlet flow channel, oil return flow channel, first actuating port flow channel, second actuating port flow channel;Two cavities are arranged in the position of the length direction of the two ends of valve body inside close to valve sleeve, the valve body inside is also provided with balance passage, balance passage is used to connect the two cavities inside valve body, oil liquid in one cavity can flow to another cavity by balance passage when valve core is translated in valve sleeve;Utilize such a kind of servo valve flow channel and servo valve, by setting cavity and balance passage as control oil cavity and control channel in the two ends of valve sleeve, the pressure fluctuation when spool moves is reduced to controllable range, to balance two sides oil pressure, reduce rigid impact and valve core resistance.

This utility model relates to the field of rock cuttings processing technology, specifically to a rock cuttings conveying device, including a conveying pump mechanism, a rock cuttings receiving chamber, a main hydraulic pump, a secondary hydraulic pump, a valve block, a hydraulic control tank, and a skid. The conveying pump mechanism includes a swing pipe and a conveying assembly. The rock cuttings receiving chamber and the swing pipe are both integrated in a first chamber A, with the swing pipe connected below the rock cuttings receiving chamber. The main hydraulic pump, secondary hydraulic pump, valve block, hydraulic control tank, and conveying assembly are all integrated in a second chamber B. The oil outlets of the main hydraulic pump and the secondary hydraulic pump are connected to the conveying assembly via the valve block, and the conveying assembly is connected to the swing pipe. The hydraulic control tank is connected to the oil inlets of the main hydraulic pump and the secondary hydraulic pump. Both the first chamber A and the second chamber B are integrated on the skid. This utility model achieves modularization, facilitating installation and relocation, and occupies a small area. The main hydraulic pump and / or the secondary hydraulic pump can be selected according to the liquid level in the rock cuttings receiving chamber, achieving energy saving.

This invention discloses a hydraulic control system for a hydraulic breaker and related construction machinery. The system includes: an inlet oil circuit for connecting to the inlet of the excavator's hydraulic breaker; a return oil circuit for connecting to the return port of the hydraulic breaker; and a rebound pressure relief oil circuit, with its inlet and outlet ends connected to the inlet and return oil circuits, respectively. When the pressure at the inlet meets the rebound pressure relief condition, the rebound pressure relief oil circuit is in a connected state; when the pressure at the inlet does not meet the rebound pressure relief condition, the rebound pressure relief oil circuit is in a closed state. This invention, through the rebound pressure relief oil circuit, can release abnormally high pressure generated by rebound, greatly improving the load-bearing capacity of the hydraulic system and enhancing system reliability.

The utility model belongs to the technical field of air-conditioning oil pumps, and particularly relates to an air-conditioning compressor oil pump with a pressure release valve structure, which comprises a main pump body, an oil inlet is arranged on one side of the main pump body, a pressure release valve is fixedly connected with one side of the main pump body and one side of the oil inlet, the main pump body can be conveniently fixed through a fastening opening, and internal threads are arranged, so that the pressure release valve is convenient to use. And the pressure release valve can be conveniently connected with an external pipe fitting. Through the arrangement of the pressure release valve, the oil pressure can be effectively released, so that the use safety of the oil pump is ensured.

The invention discloses an automobile active suspension high-pressure oil pump testing device and a using method thereof. The device comprises a pre-pressing tank, a testing unit and a circulating oil way. The pre-pressing tank is used for storing oil and providing stable pre-pressure; the testing unit is used for mounting and driving a high-pressure oil pump with first and second pump ports; the circulating oil path is connected between the pre-pressing tank and two pump ports of the high-pressure oil pump to form a closed circulating loop, and comprises a loading module and a one-way valve assembly; the one-way valve assembly can automatically guide the flowing direction of oil according to the rotating direction of the high-pressure oil pump, so that any pump opening serves as an oil inlet when rotating forwards and serves as an oil outlet when rotating backwards. According to the design, self-adaptive switching of an oil way is achieved in a pure hydraulic mode, forward and reverse rotation performance testing of the oil pump can be completed without disassembling a pipeline, the problems of pre-pressure fluctuation, oil pollution and low efficiency caused by system opening in a traditional method are effectively solved, and the testing reliability and efficiency are remarkably improved.

The invention discloses a loader and a double-pump two-way interchange energy recovery system of a movable arm oil cylinder of the loader, and relates to the technical field of hydraulic drive of loaders. The system comprises a two-position four-way electromagnetic directional valve, a three-position four-way electromagnetic directional valve, a hydraulic energy accumulator, a third two-position two-way electromagnetic directional valve connected to the hydraulic energy accumulator, a first pump motor, a second pump motor, a first motor and a second motor, wherein oil inlets of the first pump motor and the second pump motor are connected to a hydraulic oil tank, and the first motor and the second motor are in transmission connection with the first pump motor and the second pump motor respectively. The hydraulic oil cylinder is provided with a rodless cavity and a rod cavity, and the first two-position two-way electromagnetic directional valve and the second two-position two-way electromagnetic directional valve are connected to the rod cavity and the rodless cavity respectively; and the two-position four-way electromagnetic directional valve is used for communicating oil outlets of the first pump motor and the second pump motor with the first two-position two-way electromagnetic directional valve and the second two-position two-way electromagnetic directional valve respectively. And the three-position four-way electromagnetic directional valve is used for switching and communicating the third two-position two-way electromagnetic directional valve with the rodless cavity, the rod cavity and an oil inlet of the first pump motor.

The utility model discloses a motor cooling unit and a generator for a gas turbine. The motor cooling unit comprises a stator cooling unit and a rotor cooling unit. The stator cooling unit comprises a spiral water tank arranged on the outer ring of the casing and a water jacket sleeved on the outer ring of the casing, and a spiral water-cooling closed cavity is formed between the casing and the water jacket; the rotor cooling unit comprises n axial oil ducts arranged in the rotor and oblique oil ducts corresponding to the axial oil ducts, the n axial oil ducts are parallel to the axis direction of the rotor and are arranged in the rotor by taking the axis of the rotor as a central symmetry line, and the axial oil ducts and the rotor hollow shaft hole are communicated through the oblique oil ducts; and a rear cover plate of the motor is provided with an oil outlet and an oil inlet. According to the utility model, a stator unit spiral water channel cooling mode and a rotor unit Z-shaped oil channel are adopted, so that the cooling efficiency of the generator is improved, and the temperature rise of the generator is controlled within a specified range.

This invention discloses a constant flow pressure reducing valve, relating to the field of hydraulic valve technology. It includes a valve seat with an oil outlet, an oil inlet, and a drain port arranged sequentially from right to left. An elastic pressure regulating component is located at the left end of the valve seat, and a spool valve core is abutted at the right end of the elastic pressure regulating component. An axially movable elastic flow control valve core is located at the right end of the spool valve core. A drain channel communicating with the inner cavity of the valve seat is opened at the left end of the spool valve core, and the drain channel is connected to the drain port. The valve core slides within the valve seat, allowing oil to flow out from the drain port to relieve pressure. An oil inlet channel communicating with the oil inlet is located at the right end of the spool valve core, and a throttling channel communicating with both the oil inlet and outlet is provided on the elastic flow control valve core. The movement of the elastic flow control valve core within the valve seat maintains a constant pressure difference between the throttling channel and the oil inlet channel, thereby achieving a constant output flow rate. This constant flow pressure reducing valve achieves pressure reduction in the oil circuit and a constant output flow rate, facilitating processing and disassembly, and simplifying the hydraulic circuit.