45results about How to "Improve dynamic sealing performance" patented technology

The invention discloses a cycloidal pinion submersible water impeller directly connected with a motor. The cycloidal pinion submersible water impeller comprises a motor directly-connected type cycloidal pinion transmission system; the motor(1) is provided with a leakage alarming protection system comprising a leakage alarm device(31) and an oil-water probe alarm device(32); the leakage alarm device(31) is provided with a vertical slide rod(18) provided with a nut(19) and a sliding type buoy(20) arranged from top to bottom, and the upper wall of an inner chamber of the sliding type buoy(20) isfixedly provided with a magnetic coil(21) which can up and down slide on the vertical slide rod(18) along the sliding type buoy(20); and the inside of the vertical slide rod(18) is provided with a blind hole, the inside of the blind hole is fixedly provided with a dry reed tube(22) and a leakage alarm signal line(23), and the dry reed tube(22) is connected with a leakage alarm control circuit through the leakage alarm signal line(23).

The invention provides a radial-inward-flow turbine device with a shock-absorbing damping function and a sealing structure. During work, a working medium enters the radial-inward-flow turbine device through an air inlet volute firstly, and then enters nozzle rings, the pressure of the high-temperature and high-pressure working medium is gradually decreased, the flowing speed is gradually increased, the working medium at outlets of the nozzle rings enters from an inlet of an impeller and does work through expansion in the impeller, and the pressure and the temperature are gradually decreased; and in the impeller, the working medium is subjected to flow guiding by closed flow channels formed by blade inlet shrouds and a hub firstly, then arrives at the middles of impeller blades of a radial-inward-flow turbine to continue doing work through expansion, and finally passes through closed flow channels formed by blade outlet shrouds and the hub, and the low-pressure and low-temperature working medium is discharged from the radial-inward-flow turbine device through an outlet flow channel. The radial-inward-flow turbine device adopts the shroud structures at inlets and outlets of the blades, by matching brush-type sealing between an impeller cover and the impeller blades, the aerodynamic efficiency of the radial-inward-flow turbine device is improved while rigidity is improved significantly, vibration response is lowered and operating safety is ensured, and the radial-inward-flow turbine device has important engineering significance and wide application prospects.

The invention discloses an underwater electric actuator, which comprises an electric actuator, a protective barrel body, a first pressure cap, a sealed cabin and a second pressure cap. The electric actuator comprises an electric actuator body and a telescopic rod connected with the electric actuator body; the protective barrel body is arranged on the electric actuator body. The front end of the protective barrel body is hermetically and fixedly connected with the first pressure cap, the rear end of the protective barrel body is hermetically and fixedly connected with the second pressure cap, the sealed cabin is fixedly connected with the second pressure cap, the telescopic rod passes through the second pressure cap and the sealed cabin, and the telescopic rod and the second pressure cap and the telescopic rod and the protective barrel body are sealed and connected; a sponge thin insulating oil filling area, a rubber sleeve and a viscous insulating grease asbestos ring are arranged coaxially from the outside to the inside of the sealed warehouse; the side wall of the sealed cabin is provided with an opening on the side of the sealed cabin, and a third pressure cap is installed at the opening of the sealed cabin. The underwater electric actuator can improve the dynamic sealing performance of the underwater actuator and overcome the defect that the underwater electric actuator iseasy to leak.

The invention provides a lateral pressure spiral spring which is formed by rotating and bending a cylindrical body wound by using linear materials, wherein the axis of the cylindrical body is a central line of the spring, and basic parameters include a material linear diameter, an external diameter of the spring and a spiral angle; and the cylindrical body can be wounded into a cylinder or a ring shape connected end to end. The lateral pressure spiral spring is characterized in that the spiral angle is a variable. The front half circle of the spiral angle is a positive spiral angle, and the rear half circle of the spiral angle is a negative spiral angle; a transitional surface of break points of the spiral angle is formed between the front half circle and the rear half circle, and the absolute value of the positive spiral angle is larger than that of the negative spiral angle; and the spring is in a spiral raising structure as a whole. The spring can be applied to various mechanical application fields and particularly to the sealing field, is wide in stress range and can provide multidirectional stress compensation for elements, the stress compensation direction can be adjusted at any time along with the change of an external acting direction, and the spring can still provide enough stress compensation when pressure stress is not on the same horizontal surface but forms a certain angle with the horizontal surface.

A submerged propeller has a directly coupled motor-cycloidal spider driver system consisting of a motor with single-end mechanical seal on its mainshaft, a cycloidal spider type speed reducer with dual-end mechanical seal and multi-lip seal on its output axle, a propeller, and a leakage alarm protecting system for the front and back bearing covers of said motor.

The invention discloses a dynamic sealing device which is used for achieving sealing between relatively moving equipment. The dynamic sealing device comprises a flexible sealing pipe, a first connecting part, a second connecting part and a compensating arm, wherein the first connecting part and the second connecting part are arranged at the two ends of the flexible sealing pipe respectively, and the compensating arm is connected between the first connecting part and the second connecting part. The first connecting part is fixed to the first equipment, the second equipment is inserted into the flexible sealing pipe inwards from the second connecting part, and the compensating arm allows the first equipment and the second equipment to conduct relative displacement in the axial direction, the radial direction and the angle direction of the first equipment and the second equipment. The dynamic sealing device used for achieving sealing between the two sets of relatively moving equipment comprises the flexible sealing pipe which can be bent to deform, the first connecting part arranged at one end of the flexible sealing pipe and the second connecting part arranged at the other end of the flexible sealing pipe; because the first connecting part and the second connecting part can perform relative deviation in the axial direction, the radial direction and the angle direction, relative deviation, in the axial direction, the radial direction and the angle direction, of the two sets of relatively moving equipment can be effectively compensated for, and the dynamic sealing performance of the dynamic sealing device can be improved.

A low-hysteresis contact type fingertip seal with a fin comprises a contact type fingertip sealing device matched with a rotor. The contact type fingertip sealing device is formed by connecting a front baffle, a high-pressure fingertip sheet and a low-pressure fingertip sheet. The low-pressure fingertip sheet is provided with a fin structure, and the fin structure and the surface of the low-pressure side of a fingertip beam are arranged in a T-shaped mode. The fin structure has a certain width in the axial direction and accordingly can provide supporting force for resisting the front-back differential pressure for the fingertip sheet, so that the fingertip sheet is protected against axial deformation under the action of fluid pressure, and the fin structure plays a role in axially supporting a rear baffle in a conventional contact type fingertip seal. The rear baffle structure is omitted. The hysteresis effect caused by friction force between a low-pressure fingertip sheet and the rear baffle of the conventional contact type fingertip seal is reduced. The dynamic sealing performance of the contact type fingertip seal is improved.

A non-contact fingertip sealing device with a fin comprises a non-contact fingertip sealing device part matched with a rotor, wherein the non-contact fingertip sealing device part is formed by sequentially connecting a front baffle, a rear baffle, a high-pressure fingertip sheet and a low-pressure fingertip sheet with a fingertip boot structure; the fin that is arranged in a T shaped manner together with a low-pressure side surface of a fingertip beam and the fingertip boot structure is arranged on the low-pressure fingertip sheet; the fin and a low-pressure fingertip boot utilize hydrodynamic pressure and hydrostatic pressure effects; a lifting force is generated by the action of a front and rear pressure difference and rotation of the rotor to lift the fingertip sheets off the surface of the rotor, so as to achieve sealing and no contact with the rotor; when the rotor has radial displacement, the structure can more effectively and automatically adjust gestures of the fingertip sheets; the motion of the fingertip sheets adapts to radial runout of the rotor; a sealing effect is ensured and a non-contact state is kept at the same time; an effect of reducing and even eliminating the conventional non-contact fingertip sealing 'lag effect' is exerted; and the dynamic sealability of non-contact fingertip sealing is improved.

The invention discloses a machining process for a rotating vane type hydraulic steering engine. The machining process comprises the following machining procedures: machining a rotor, a cylinder and a fixed blade, assembling the cylinder and the fixed blade, machining the rotor body of the rotating vane type hydraulic steering engine and machining a sealing groove of the fixed blade, wherein in the rotor body machining procedure, a moveable blade and a substrate are separately machined; in the cylinder machining procedure, the casted and molded blank is subjected to coarse turning, precise turning, pneumatic grinding, polishing with sand bags, round angle trimming and oil hole machining on a numerical control vertical lathe; in the machining procedure of the fixed blade of the rotating vane type hydraulic steering engine and the assembling procedure of the fixed blade and the cylinder, the casted and molded blank is subjected to coarse turning, ageing, semi-precise turning, linear cutting, cover plate mounting hole boring, clamping, boring first mounting threaded holes of the cylinder, fixing cylinder and the fixed blade, machining pin holes and threaded holes for assembling the cylinder and the fixed blade, clamping, hydraulic valve mounting hole drilling, sealing groove boring and milling, fixing the cylinder and the fixed blade, precise turning of inner holes of the assembled fixed blade, threaded holes and sealing groove machining, and facing-up with the cylinder cover, so as to finish machining.

The invention discloses an aircraft wheel inner oil deflector ring and an oil deflector ring assembly thereof. The inner oil deflector ring includes a metal frame ring, a dynamic seal ring and a static seal ring, and the dynamic seal ring is detachably arranged on the metal frame ring. On the outer diameter side of the wheel, the static sealing ring is detachably arranged on the outer end surface of the metal skeleton ring; the dynamic sealing ring is dynamically sealed with the inner diameter side of the wheel, and the static sealing ring is connected with the inner ring static seal; the oil deflector ring assembly includes an inner oil deflector ring and an outer oil deflector ring, and the inner oil deflector ring and the outer oil deflector ring are respectively arranged on the inner side and the outer side of the tapered roller bearing; The skeleton ring is detachably provided with a dynamic seal ring and a static seal ring, the dynamic seal with the inner diameter side of the wheel is realized through the dynamic seal ring, the static seal with the inner ring of the tapered roller bearing is realized through the static seal ring, the static seal ring and the The dynamic sealing ring can adopt different structures or materials to achieve better sealing effect.