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

Embodiments of the invention discloses a novel coating with a composite structure and a preparation method thereof; the coating is a composite coating with a three-layer structure, wherein a bonding layer is prepared on a turbine alloy substrate surface by a high speed flame spraying method; a porous zirconia ZrO2 ceramic layer is prepared on the bonding layer surface by plasma spraying; a film aluminium layer is prepared on the ceramic layer surface by vapour deposition technology, and is oxidized into a dense alumina Al2O3 surface layer. The composite coating prepared by the method can reduce oil consumption of the turbine engine, and increase engine efficiency and thermal cycling resistance; and the service life of the turbine and the whole performance of the equipment are improved.

The invention discloses a flow control device for a heat exchange system. The device comprises a movable valve piece, a transmission piece and an elastic piece, wherein a first valve piece and the transmission piece are assembled, the flow control device is provided with a mounting area located between the first valve piece and the transmission piece, the elastic piece is located in the mounting area, a limiting stop part of the flow control device is located on the outer side of the elastic piece in the radial direction, and along the vertical direction where the central axis of the elastic piece locates, the first end part of the elastic piece is in butt joint with a first pressure bearing surface of the first valve piece, and the second end part of the elastic piece is in butt joint with the second pressure bearing surface of the transmission piece. According to the device, the elastic piece which is not easy to fall off is arranged so as to press downwards the movable valve piece,the dynamic sealing performance between the movable valve piece and a matched part is improved, and the internal sealing performance of the flow control device can be improved by relatively reducing internal leakage of a working medium.

The invention relates to the technical field of explosion-proof motors, in particular to a magnetofluid sealed positive pressure explosion-proof motor. The motor comprises a shell, a rotor, retainers,a positive pressure system and a protective shell; the rotor is installed in the shell, and the retainers sleeve the outer sides of the two ends of the rotor; a part, located outside the shell, of arotor rotating shaft is fixedly sleeved with a plurality of outer convex rings. The two retainers are embedded into embedding grooves in the two sides of the shell respectively; permanent magnets arearranged in the retainers; the shell is connected with the positive pressure system; the positive pressure system comprises a gas conveying pipe, a gas pressure detector and a protective gas tank; thegas conveying pipe is embedded in the outer wall of the shell; the other end of the gas conveying pipe is communicated with the protective gas tank. By the adoption of the technical scheme, a sealingring and lubricating oil are arranged between the outer end faces of the retainers and the shell in the sealing system, the sealing ring of the sealing system and the shell can achieve static sealing, an outer convex ring and an inner concave ring are matched with each other to form a zigzag dust blocking face, and the dust blocking effect is achieved.

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.

The device provides a coiled tubing motive sealing device, and the technical scheme is that a lower part sealed oil scraping structure and an upper part righting mechanism are connected with a connecting bolt through a limiting support plate; the inner cavity of the support plate is a sealed cylinder; and a sealed basics sleeve, a sealed rubber core and an easily-changed rubber blanket are added on the inner cavity of the sealed cylinder, the sealed rubber core is arranged in the inner cavity of the sealed basics sleeve, thereby opening or closing the limiting support plate, and the sealed basics sleeve, the sealed rubber core or the easily-changed rubber blanket in the inner cavity of the sealed cylinder can be replaced. The coiled tubing motive seal device has the beneficial effects thatmultiple locating righting steel balls are increased to play a role of righting and reducing friction to the coiled tubing; through installing the sealed basics sleeve, the sealed rubber core and theeasily-changed rubber blanket which can be replaced in a split mode in the sealed cylinder, not only can motive sealing of the coiled tubing be realized, but also the replacement of the correspondingsealing elements is facilitated; and oil scraping device is added, the effect of motive sealing is improved, the service life of the coiled tubing is prolonged, and leakage accidents in the wellheadis avoided.

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 a moveable side striker plate for a double-drum drier material pond, comprising a side striker plate, an end wallboard, a sealing unit and a plurality of push rod assemblies with same structure, wherein the side striker plate is produced by compounding two kinds of materials with different properties; the end wallboard is fixedly arranged at the outer side of the end surfaces of two drums of the double-drum drier; each set of the push rod assembly comprises a push rod drive unit and a push rod, wherein the push rod drive unit is fixedly arranged on the outer side plate surface of the end wallboard, one end of the push rod is fixedly connected with the side striker plate, and the other end of the push rod is movably connected with the matched push rod drive unit through the through holes of the sealing unit and the end wallboard. According to the invention, the moveable side striker plate disclosed in the invention can make a bidirectional horizontal linear motion under control, can timely adjust the clearance between the moveable side striker plate and the end surfaces of two drums and effectively prevent the leakage of raw material fluids, is convenient for checking and changing easily damaged parts, and is beneficial for thoroughly cleaning the device.

A flow control device used for a heat exchange system comprises a shell body, a transmission piece and a first valve piece. The first valve piece comprises a valve main body; a first contact part anda first communicating channel are formed in the valve main body; an opening of the first communicating channel penetrates through one side of the valve main body and faces the side where the first valve piece is located; the first contact part surrounds the radial circumferential side of the opening of the first communicating channel; and a second contact part is further formed on the flow controldevice and located on the radial circumferential side of a circulating valve opening, and the first contact part and the second contact part are arranged in a movable seal mode. The transmission piece can drive the first valve piece through a second transmission part to rotate stably, the movable sealing property of the movable valve piece and the matched part can be improved, inner leakage of aworking medium is relatively reduced, and the inner sealing property of the flow control device can be improved.

The invention discloses a tumbler switch for tanks and armored vehicles, and relates to the technical field of structures of electronic switches. The tumbler switch comprises an upper shell and a lower shell which are fixedly connected; a sealing washer is arranged between the upper shell and the lower shell; the inside of a cavity formed by the upper shell and the lower shell is provided with a shifting fork and four movable contact arms respectively; the bottom of the lower shell is fixed with four contact columns matched with the four movable contact arms; the upper part of the shifting fork is connected with a ball handle of which the upper part is arranged in a middle hole of the upper shell; and the tumbler switch is characterized in that: the upper end of the upper shell is fixedly connected with a cover plate; the center of the cover plate is provided with a through hole adapted to the ball handle; a sealing gasket is arranged between the cover plate and the upper shell; a copper gasket is arranged between the sealing gasket and the upper shell; and an epoxy resin sealing layer is arranged between the contact columns and the lower shell. The product has good leakproofness, particularly can be used for circuit connection/disconnection or change on surface equipment matched with the tanks and the armored vehicles, and the like, and can keep for 96 hours in a constant temperature and humidity resistant test.

The invention discloses a novel lifting cylinder. The novel lifting cylinder comprises a cylinder body (2) with a first inner cavity (1), a piston (4) which is arranged inside the cylinder body (2) and can slide along the inner wall of the cylinder body (2), and a base (6) which is connected to the first end of the cylinder body (2) and can input gas to the cylinder body (2). The piston (4) is further fixedly connected with a piston rod (8) which penetrates through the second end of the cylinder body (2). The piston rod (8) is connected with the second end of the cylinder body (2) in a dynamic sealing mode. The novel lifting cylinder achieves fast gas advance and retreat, and can provide larger energy, hoist the height and increase the frequency for an impact test stand when being applied to the field of impact and collision tests.

The invention provides a waterproof electric push rod comprising a base, a conduit, an electric motor, a storage battery, a double-pole double-throw switch, a push rod and a dynamic seal ring. The conduit is installed at the upper side inside the base; the motor is installed at the lower side inside a motor box; the storage battery is installed at the upper side inside the motor box; the double-pole double-throw switch is arranged at the front side of the annular side of the motor box; the push rod is installed inside the conduit; and the dynamic seal ring is installed at the upper side insidethe conduit. Therefore, problems of unstable transmission and poor reciprocating effect controlling of the original waterproof electric push rod are solved. The waterproof electric push rod has advantages of reasonable structure, good waterproof sealing performance, good transmission effect and stable working performance.

The invention discloses a power sealing type vertical long shaft pump. The power sealing type vertical long shaft pump comprises a motor base, wherein a motor is fixedly arranged on the upper side ofthe motor base; an observation chamber is fixedly arranged on the lower side of the motor base in a matched mode; a cooling chamber is fixedly arranged on the lower side of the observation chamber ina matched mode; a pump base is fixedly arranged in the cooling chamber in a matched mode; a first external connection pipe is fixedly arranged at the lower end of the pump base in a matched mode; a second external connection pipe is fixedly arranged at the lower end of the first external connection pipe in a matched mode; a backflow body is fixedly arranged at the lower end of the second externalconnection pipe in a matched mode; a filter screen is fixedly arranged on the lower side of the backflow body in a matched mode; a shaft body assembly is arranged in the first external connection pipeand the second external connection pipe; an auxiliary impeller assembly matched with the shaft body assembly is arranged in the cooling chamber; a cooling assembly matched with the auxiliary impellerassembly is arranged in the cooling chamber; a bearing part matched with the shaft body assembly is arranged in the observation chamber; and an impeller assembly is arranged in the backflow body in amatched mode. According to the power sealing type vertical long shaft pump, the working temperature of a sealing ring in the device can be reduced, the service life of the sealing ring is prolonged,the sealing effect is effectively improved, and the high reliability is achieved.

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.

The invention discloses a polyimide composite material-fluororubber material combined seal which is composed of a metal outer framework (1), a metal inner framework (2), a metal framework pressing ring (3), a fluororubber sealing ring (4), a carbon steel spring (5), a polyimide sealing ring (6) and a spring piece (7). The sealing device is mainly characterized in that the fluororubber sealing ring (4) and the carbon steel spring (5) are combined to seal oil, the carbon steel spring (5) provides corresponding holding force for the fluororubber sealing ring (4), the polyimide sealing ring (6) is made through a machining process and combined with the spring piece (7) to seal gas, and the spring piece (7) improves the following performance of the polyimide sealing ring (6). Through the combination of different materials and different structure seals, a sealing product can seal grease and high-pressure air at the same time, and the sealing performance is maintained at a reasonable level for a long time. The sealing device is stable in working condition, reliable in sealing performance, long in service life, convenient to install, good in universality and interchangeability, capable of adapting to working conditions of high temperature, high speed, dry grinding and the like, and particularly suitable for the severe environment where a sealing shaft jumps randomly and other conditions with the harsh sealing requirement.