92results about How to "Zero leakage" patented technology

The invention discloses a novel vertical multistage pump. The novel vertical multistage pump comprises a pump body shell; a pump shaft is mounted in the pump body shell, and is provided with multiple impellers; a half-integrated mechanical seal is mounted on the pump shaft at the tops of the impellers, and includes a machine seal shaft sleeve; the machine seal shaft sleeve is provided with a clamping groove; a movable ring is embedded in the clamping groove; the machine seal shaft sleeve is coated with a static ring base on the outer peripheral surface on the movable ring, and is provided with a groove in the bottom; a static ring is tightly matched and embedded in the groove, and is tightly bonded with a friction surface of the movable ring; two steps are arranged on the outer peripheral surface of the static ring base, and are respectively a large step and a small step; the large step is connected with a machine seal gland through multiple small springs; meanwhile, the small step is sealed with the machine seal gland through a sealing ring; a high-pressure cavity is betwen the outer side of the half-integrated mechanical seal and the inner wall surface of the pump body shell; an input port is in the lower part of one end of the pump body shell; and an output port is in the upper part of one end of the pump body shell, and is communicated with an outlet of the final-stage impeller. The novel vertical multistage pump is excellent in reliability and long in service life.

The invention discloses a double mechanical sealing method and a double mechanical sealing device for kettle gas films, and belongs to the field of machine manufacture. The double mechanical sealing device mainly comprises a shaft sleeve, a moving-ring seat, a stationary ring, a stationary-ring press plate, a moving ring, a bearing, a stationary-ring seat, an auxiliary seal and the like. The double mechanical sealing method is characterized in that a back-to-back rotating double-end-face structure is adopted for sealing to realize non-contact operation, and a fluid dynamic-pressure groove is formed in the end face of the seal stationary ring; high-pressure isolating gas is injected between two sealing structures, and a spring is not affected by solid particles and impurities in media as not contacting with the media; the stationary ring which is supported by two O-shaped rings and is positioned by the press plate can bear back pressure; a cartridge structure is adopted. The double mechanical sealing method and the double mechanical sealing device have the advantages that an auxiliary system is simple in structure and can ensure technological media to be prevented from pollution, leakage and overflow of sealed media can be completely avoided, and no environmental pollution is caused; through the cartridge structure, accuracy, convenience and rapidness in overall mounting are realized, and demounting is facilitated. The device is applicable to various blenders, reactors, dryers, reaction kettles, polymerizers and the like in the fields of petroleum, chemical engineering, pharmacy, rubber, oil refining and the like.

A permanent magnet direct control valve, comprising: a valve seat (1), a valve cover (2), a permanent magnet assembly (3), and a valve plug assembly (4) which is only installed in the valve, and the valve plug assembly (4 ) is used to directly close or open the valve port (FK). Application of permanent magnet direct control valve: The inlet, outlet and magnetic control position of the permanent magnet direct control valve can be selected arbitrarily, and the permanent magnet assembly (3) can be dragged in different ways to form a new product with different functions and excellent performance. The advantages of the permanent magnet direct control valve and its application of the present invention are: the permanent magnet direct control valve has simple structure, low cost, no wearing parts, zero leakage, brisk operation, high reliability and long life, and its application is very wide. Various functional products such as faucets, triangle valves, liquid level valves, foot valves, and fuel guns are easy to promote, and people are willing to accept them. A large number of such products will produce significant savings and low-carbon effects.

The invention discloses a horizontal sand mill which comprises a base, a motor, a main shaft and a grinding cylinder. The motor is fixed on the base, the main shaft is hollow and is connected with the motor through a belt pulley, cooling oil chambers are fixedly arranged around the main shaft, a cooling water flowing passage is intermediately formed, a plurality of grinding rods are fixedly arranged around the outer wall of a grinding inner sleeve, a cooling water pipe is arranged in the grinding inner sleeve, a U-shaped spiral water channel is fixedly arranged around the outer wall of the cooling water pipe, and a feeding hole and a discharging hole are arranged on a grinding outer sleeve. In the mill, both-end-surface mechanical sealing is adopted and a sealing ring is arranged at the joint of a bearing and a shaft. By adopting the technical scheme of the invention, the defects caused by overhigh temperature generated when a traditional horizontal sand mill runs are effectively overcome, the sand mill is stable and reliable to run, and the production quality and the operation efficiency are greatly improved.

The invention discloses a prefabricated intelligent rainwater and sewage separation well, comprising a well body. The well body is provided with a water inlet, a sewage outlet, a rainwater overflow port and a submersible sewage pump, the sewage outlet communicates with the submersible sewage pump, and the submersible sewage pump is connected with a liquid level control switch. The bottom hole sewage collecting slope adopts the steepest descending line design, so that the sewage cleaning effect and efficiency are improved. By applying the prefabricated intelligent rainwater and sewage separation well, rainwater and sewage can be shunted, and the water level can be raised; even through the same water inlet pipe, sewage enters a sewage pipeline after passing through the separation well in sunny days, and clean rainwater obtained after automatic cleaning, initial discarding and secondary sedimentation is completed in rainy days flows into a rainwater pipeline.

A rotary actuator mechanism for applying torque to a shaft and comprising an actuator housing forming an actuator path that includes an actuator pinion rotatably supported in said housing and having said shaft secured thereto. The pinion having peripheral notches of a selected shape and positioned within the actuator path. The mechanism having a train of discrete actuator elements having opposite ends and positioned in the actuator path, each of the actuator elements being of said selected shape to enable reception in the peripheral notches, a plurality of the elements engaging the notches. The mechanism having at least one linear actuator supported by the housing and engaging one of the ends of the train of actuator elements, the linear actuator being selectively activated to push the train of discrete actuator elements through the actuator path to thereby serially engage the actuator elements with the notches of the pinion and thereby apply torque to the shaft.

The invention relates to a dual soft sealing flat gate valve. The dual soft sealing flat gate valve comprises a valve body, a valve cover, a sealing gasket, a valve rod, a padding pressing plate, a gland box, a flashboard and valve seats. A medium passage is transversely and coaxially formed inside the valve body, the valve cover is longitudinally, coaxially and fixedly installed at the upper end of the valve body, the valve rod is longitudinally and coaxially installed in the middle of the valve cover, the gland box is coaxially installed between the valve cover and the valve rod at the lower end of the padding pressing plate in a pressing mode, the lower end of the valve rod stretches into the valve body, the flashboard is longitudinally, coaxially and fixedly installed at the lower end of the valve rod, the two parts, located on the two transverse sides of the flashboard, of the valve body are internally provided with the valve seats respectively and symmetrically in a pressing mode, two rectangular grooves are longitudinally formed in the valve seat contact face connected with the flashboard at intervals, an RPTFE rectangular sealing ring is embedded inside one rectangular groove close to the medium passage, and a rectangular rubber ring is installed inside the other rectangular groove. The dual soft sealing flat gate valve is simple in structure, scientific in design, reliable in sealing, easy to machine, low in sealing specific pressure, flexible in operation, long in service life and high in sealing reliability, torque is reduced, and the sealing performance is improved.

The invention discloses a composite seal-based spiral sheet sealing assembly and belongs to pioneering inventions in the field of sealing. At least one spiral sheet sealing assembly is arranged in a sealed cabin to wrap a sealed part, each spiral sheet sealing assembly is sequentially provided with a shifting ring, a spiral sealing sheet and a fixing ring installed in the sealed cabin in the axial direction, and each spiral sealing sheet is axially and tightly attached and is radially and tightly attached to the sealing ring surface of the sealed part to form a sealing pair at the same time; or a spiral sheet sealing assembly and a corrugated pipe clutch are arranged in the sealed cabin to wrap a rotating shaft, a fixed end plate is arranged at one end of a corrugated pipe of the corrugated pipe clutch, a movable end plate is arranged at the other end of the corrugated pipe, the fixed end plate is tightly connected with the inner cavity of the sealed cabin, the movable end plate can axially move in the inner cavity of the sealed cabin, and when the relative pressure difference between two end surfaces of the movable end plate is greater than zero, the sealing end surface of the movable end plate and the sealing end surface of the corresponding sealing ring seat form a sealing pair. The assembly is simple and reliable in structure, wide in application, high in cost performance, zero in leakage, long in service life and convenient to maintain.

The invention relates to a novel three-way reversing valve. The novel three-way reversing valve is characterized by comprising a hollow reversing cavity (3), an air inlet, an air outlet and a reversing opening are respectively formed in the side face of the reversing cavity (3), the reversing opening is formed between the air inlet and the air outlet, a piston cavity (1) is formed in the top end of the reversing cavity (3), a signal inlet is formed in the piston cavity (1), a base (5) is arranged at the bottom end of the reversing cavity (3), a guide piston (82) is arranged in the reversing cavity (3), the top of the guide piston (82) is connected with a pneumatic piston (2), the pneumatic piston (2) is arranged in the piston cavity (1), and the outer wall of the pneumatic piston (2) and the inner wall of the piston cavity (1) are in gas seal. According to the reversing valve, a compressing structure of a metal valve base and V-type rubber is adopted by the sealing structure, and the defects that machining difficulty of a traditional structure is large, and after a sealing ring is abraded, air leakage is prone to happening are overcome.

The invention discloses a tank panoramic mirror sealing structure, relating to a magnetic liquid sealing structure, which respectively arranges a first O-shaped ring (2) and a second O-shaped ring (7) into two annular slots (12, 13) of a non-magnetic sleeve (9); mounting a right polar boot (8), a permanent magnet (5) and a left polar boot (4) from the small end of the non-magnetic sleeve (9); using a nut (3) to connect the screw of the small end of the non-magnetic sleeve (9) to lock the three elements on the non-magnetic sleeve (9), connecting the non-magnetic sleeve (9) and an direction shaft (1) via screws; sheathing an upper adverse head (10) on the right polar boot (8) and the left polar boot (4) and forming a sealing clearance (6); filling magnetic liquid into the sealing clearance (6) to form a tank panoramic mirror sealing structure. The tank panoramic mirror sealing structure has low resistance moment, simple installment, high reliability, long service life and the ability for realizing zero leakage.