35results about How to "Change flow area" patented technology

The invention belongs to the technical field of engineering machinery, and specifically relates to a hydraulic system of an excavator with dual working modes, which includes a pilot control module, a main oil circuit control module and an execution module. The pilot control module includes a pilot pump, a manual pilot control valve group, The intelligent pilot control valve, the main oil circuit control module includes the main oil pump, the main control valve group, and the intelligent control valve. The hydraulic oil provided by the pilot pump reaches the intelligent control valve through the intelligent pilot control valve, and the intelligent control valve is located on the left side of the spool. At the same time, the hydraulic oil provided by the pilot pump reaches the switch valve through the intelligent pilot control valve, and the switch valve is in the lower working state of the spool moving up or the spool is down. In the upper working state of the shift, only one electrical signal can be input to realize the excavation action of the entire excavator, realizing the intelligent and unmanned excavation control of the excavator.

The invention discloses a hydraulic power compensation balance valve. The pilot control end cover assembly includes a control end cover valve body, and a pilot oil channel is arranged on the control end cover valve body; the valve core assembly includes a throttle valve core, a main spring, a regulating valve Seat; one-way valve seat assembly includes one-way valve and one-way valve spring; balance valve body assembly includes balance valve body and valve seat; throttle valve core is provided with a throttle port with an angle of α; the inner wall of the right end of the one-way valve The conical surface and the conical surface of the throttle port of the throttle spool cooperate with each other to form an openable seal; the one-way valve moves to the left during the luffing operation to realize the function of the one-way valve from the oil port A to the oil port B of the balance valve. During the luffing operation, the throttle spool opens to the right under the action of the pilot control pressure to realize the balance valve function from oil port B to oil port A, and as the load pressure increases, the angle through the throttle spool is α The hydraulic force generated during the annular flow channel controls the size of the throttle opening of the throttle spool to achieve load-flow compensation.

The invention discloses a moveable chemical mixer. The chemical mixer comprises a drug bag, a shrinkage section, an expansion section, a leaking screen and a spiral organ; the spiral shrinkage section is in threaded connection with the expansion section, and the leaking screen is adaptively connected with the shrinkage section and the expansion section; the spiral organ is arranged in the expansion section and in threaded connection with the expansion section; both ends of the drug bag are in threaded connection with the shrinkage section and the expansion section. By adopting the chemical mixer, pesticide is integrated to the mixer, so that the online mixing is realized, the mechanical structure is simplified, flowing path of the pesticide is greatly reduced, pesticide pollution to agricultural implements are reduced, and environment is protected; besides, the mixing efficiency of the chemical mixer is improved.

The invention provides a refrigerator. The refrigerator comprises a freezing chamber, a refrigerating chamber, a cooling chamber and an air quantity adjusting part. The cooling chamber is provided with an evaporator, is located behind the freezing chamber, and is provided with a freezing air inlet leading to the freezing chamber and a refrigerating air inlet leading to the refrigerating chamber. The refrigerating air inlet is located right behind the freezing air inlet. The air quantity adjusting part is movably arranged between the freezing air inlet and the refrigerating air inlet and is configured to be controlled to move in the transverse direction of the refrigerator so as to open or close the refrigerating air inlet; and after the refrigerating air inlet is opened, the air quantity adjusting part can be controlled to move front and back to be close to or far away from the freezing air inlet so as to adjust the open area of the freezing air inlet. An air supplying structure of the refrigerator is simple, the effective volume of the refrigerating chamber is not occupied by the air supplying structure excessively, and when the refrigerating chamber stops refrigerating, no cold air is accumulated in a refrigerating air channel.

The invention relates to a stick slip prevention torsion impact drilling tool which is used for improving the penetration rate and well quality in the field of drilling engineering. By the adoption of the stick slip prevention torsion impact drilling tool, the problem that a drilling tool and a well body are severely damaged by the stick slip phenomenon in the drilling process. According to the technical scheme, the lower end of an output shaft is connected with a screw thread of a drill bit; the upper end of an outer shell is connected with a screw thread at the lower end of an upper connector; the lower end of the outer shell is connected with a screw thread at the upper end of a transmission shell; the outer circle of a movable valve ring is in interference fit with a stepped hole in the lower portion of an inner cavity of a movable valve seat; the outer circle of a static valve is in interference fit with a stepped hole in the upper portion of an inner cavity of a transmission shaft; the lower end of a spiral rotor is connected with a screw thread at the upper end of the movable valve seat; the transmission shaft is arranged in an inner cavity of the transmission shell; the external octagon shape in the middle of the transmission shaft is in clearance fit with the internal octagon shape in the middle of the inner cavity of the transmission shell; the lower end of a spiral shell is connected with a screw thread at the upper end of the output shaft; and the upper end of a spiral shaft is connected with a screw thread at the lower end of the transmission shaft, and a spline of the spiral shaft is in clearance fit with a spline of the spiral shell. The stick slip prevention torsion impact drilling tool generates high-frequency micro-amplitude circumferential reciprocating swing, the stick slip phenomenon can be prevented, and the penetration rate is increased.

A wall-mounted air conditioner indoor unit, comprising: a housing (100) having an air outlet (120) at the front side bottom portion, a flow guide plate (200) provided below the housing (100) and forming an air mixing duct (130) with the bottom surface of the housing (100), the indoor air flowing to the air outlet (120) through the air mixing duct and being mixed with the air from the air outlet (120); a lead screw (300) which is parallel to the lengthwise direction of the housing (100) and rotatably mounted to the housing (100) and has at least one threaded section group (320), each threaded section group (320) comprising a left threaded section (322) and a right threaded section (321); a first motor (310) used for driving the lead screw (300) to rotate; at least one bracket assembly (301) comprising two ball sliding blocks (350) which are mounted to the left threaded section (322) and the right threaded section (321) respectively; two upper rods (330), the upper ends of the two upper rods being hinged to the two ball sliding blocks respectively; and a lower rod (340), the upper end of the lower rod being hinged to the lower ends of the two upper rods (330), and the lower end of the lower rod being connected to the flow guide plate (200). When the lead screw (300) rotates in a positive direction or in a reverse direction, the upper ends of the two upper rods (330) are driven, by the two ball sliding blocks (350), to translate toward each other or away from each other, such that the lower rod (340) is driven to translate up and down by the two upper rods (330), the flow guide plate (200) is driven to translate up and down, and thus the overflow area of the air mixing duct (130) is changed.

The invention relates to a turbine guide vane, a turbine and an aircraft engine. The turbine guide vane comprises a movable part and a fixed part (9), the fixed part (9) is fixed relative to a turbine case, the movable part is connected with the fixed part (9) and located on one side of the suction surface of the turbine guide vane, and the movable part can move relative to the fixed part (9) so as to change the flow area between every two adjacent turbine guide vanes. Compared with the manner that the front edge or the tail edge of the turbine guide vane is arranged to be of a rotatable structural form in the prior art, the turbine guide vane has the advantages that the movable part is arranged on one side of the suction surface of the turbine guide vane, cooling of the interior of the turbine guide vane is not influenced, the whole vane, from the front edge to the tail edge, of the turbine guide vane can be cooled by taking corresponding cooling measures, and the condition that the life is shortened due to the fact that some portions of the turbine guide vane are impacted by high-temperature fuel gas is prevented.