321results about How to "Improve the sealing effect" patented technology

The invention discloses a sealing door of a mining rescue capsule. The sealing door comprises a door panel, a decelerating mechanism, a locker mechanism, a transmission mechanism, a clamping and pressing plate, a seal ring pressing member and a seal ring, wherein two bearing plates and an oblique pressing plate of the seal ring pressing member are fixed on a door frame in the way that the bearing plates are engaged with the oblique pressing plate; a mounting groove for the seal ring is formed between the bearing plates and the oblique pressing plate; the clamping and pressing plate is fixed along the periphery of the door panel; the middle upper part of the door panel of the mining sealing door is provided with an emergency exit with an emergency door; the locker mechanism is provided with two sets of lead screws, connecting rods, locking seats and locking heads; a worm wheel and worm transmission mechanism is shared by the two sets of lead screws, connecting rods, locking seats and locking heads; the two lead screws are reverse in rotation direction; and the two ends of each connecting rod are connected with the two locking heads respectively. The sealing door realizes full sealing and provides more chance for personnel to escape; the pressing force to the seal ring is increased and the sealing effect of the sealing door is improved by pressing four points of the seal ring; and the sealing door has the characteristics of simple and reliable structure, convenience of use and low cost.

The invention discloses a refrigerator, comprising a refrigerator body, a left door body, a right door body, an overturning girder and an overturning mechanism, wherein compartments are limited in the refrigerator body; the refrigerator body is provided with a cooperated part; the left door body and the right door body can be pivoted on the refrigerator body to open and close the compartments; the overturning girder is installed on the left side surface of the right door body; the overturning mechanism is rotatably arranged on the right door body to drive the overturning girder to overturn; when the right door body is on the closing position, the overturning mechanism is cooperated with the cooperated part, the overturning girder is positioned horizontally to seal a gap between the left door body and the right door body; and when the right door body is on the opening position, the overturning mechanism is separated from the cooperated part, and the overturning girder rotates to be positioned in the front-rear direction. According to the refrigerator disclosed by the embodiment of the invention, the refrigerator has good sealing effect, and the overturning girder and the door body do not mutually interfere in the door closing process.

The invention discloses a water plugging device for petroleum pipeline maintenance. The water plugging device comprises a gasbag body and an exhaust pipe which is arranged at the end of the gasbag body. A plurality of grooves are formed in the outer circumferential wall of the middle of the gasbag body. Two elastic metal sheets are arranged in each groove in a spaced mode, and the bent part in each elastic metal sheet is fixedly provided with a reinforcing pad. When the gasbag body is inflated, the two elastic metal sheets in each groove deform to expand outwards in the radial direction of the gasbag body. Pressure in a gasbag is gradually increased, elastic deformation is made to occur to the elastic metal sheets, and the elastic metal sheets expand outwards in the radial direction of the gasbag body until the elastic metal sheets make contact with the inner wall of a pipeline. In the outward expansion process, elastic force generated by the deformation of the elastic metal sheets directly acts on scale on the inner wall of the pipeline and crushes the scale; the reinforcing pads fixed on the elastic metal sheets can weaken the impact strength between the scale and the elastic metal sheets, and the problem of stress concentration of the elastic metal sheets is solved.

The invention provides a method for sintering a polytetrafluoroethylene sealing ring. The invention employs a sintering furnace which comprises a sintering furnace body, a nitrogen conveying device and a program control device. The sintering furnace body comprises four zones such as a drying zone (2), a preheating zone (3), a sintering zone (4) and a cooling zone (5). The method comprises the following steps: (1) preparing polytetrafluoroethylene stock;(2)drying polytetrafluoroethylene stock in the drying zone; (3) preheating stock in the preheating zone; (4) sintering stock in sintering zone; (5)cooling. According to the invention, the sintering sealing effect and automatic control can be enhanced for effectively inhibiting the escape of hydrogen fluoride during the sintering process, metal powder modified materials filled in polytetrafluoroethylene is avoided an oxidation generated by contacting with air in a high temperature through a heat nitrogen cycle, thereby the usage performance and the appearance of the products can be improved.

This invention provides a flat plate type moderate temp. solid oxide fuel cell piled module composed of upper cover, single cell plates, connecting plates and bottom plate arranged in a stacked mode and having fuel gas and oxidized gas channels and inlet and outlet inside. Tanks for sealed materials are set up on the said cover, connecting plate and bottom plate, which have sectional shapes of the same 2n(n is greater than or equal to 2 natural number) polygon, whose corners extend to become long corner with fixing holes, and heating thermo-insulating plates are mounted on the upper and lowersurfaces of polygon stacked planes and the upper cover and bottom plate. The connecting plates are made of ferritic stainless steel.

The invention discloses a brake pump piston ring of a car air compressor. The brake pump piston ring comprises a first ring and a second ring. A first piston ring groove and a second piston ring groove are formed in the piston from top to bottom in the circumferential direction, wherein the first piston ring groove and the second piston ring groove are embedded into the first ring and the second ring respectively. The first ring and the second ring are piston ring sets in the opposite twist directions. According to the brake pump piston ring of the car air compressor, the sealing effect is improved through the opposite twist directions of the piston ring, downward exhaust air of the air compressor is reduced, air pressure inside a crank case in the air compressor is controlled, engine oil is prevented from pumping upwards, and the oil pumping fault rate of the air compressor is reduced by 45 percent.

The invention belongs to the field of environment sanitation facilities, and particularly relates to a water collecting type inflaming retarding garbage can. The water collecting type inflaming retarding garbage can comprises a base, the upper end of the base is fixedly connected with a can body, a can cover is rotatably connected into the can body, a water storage cavity is formed in the base, anannular water collecting groove is formed in the upper end of the base, and communicates with the water storage cavity through multiple water conveying channels, multiple water sucking pipes are arranged on the side wall of the can body in a penetrating manner, the input ends of the water suction pipes are attached to the bottom face of the water storage cavity, the output ends of the water suction pipes are arranged on the inner side wall of the can body, multiple Z-shaped air exhaust channels are formed in the inner side wall of the can body, two ends of the Z-shaped air exhaust channels are arranged on the inner and outer side walls of the can body, an annular cavity is formed in the inner side wall of the can body, a piston ring is in sliding seal connection into the annular cavity, and the interior of seal space formed by the lower side wall of the piston ring and the annular cavity is filled with evaporation liquid. Collected rainwater is used for achieving fire extinguishing ofthe garbage can, and the garbage can is energy-saving, environment-friendly, high in speed and capable of avoiding large danger.

The invention discloses a self-tightening sealing structure for a single detector. The self-tightening sealing structure comprises the detector, a tube base and a tubular connecting piece, wherein the tube base is provided with a fluid cavity and a detector introducing passage communicated with the fluid cavity; the lower end of the tubular connecting piece is arranged inside the detector introducing passage and connected with the tube base; the lower end of the detector is arranged inside the fluid cavity after passing through an inner bore of the tubular connecting piece and the detector introducing passage. An annular supporting platform is formed on the inner wall of the detector introducing passage; the detector is connected with a separation ring which is positioned below the tubular connecting piece and arranged on the annular supporting platform; a filling sealing member is arranged in an area between the tubular connecting piece and the separation ring. The self-tightening sealing structure is simple integrally, is convenient to install and disassemble, and has a reliable self-tightening sealing function to ensure a good sealing effect and improve the safety of the detector.

The invention aims to provide a constant volume bomb window with a glass window protection structure to solve the problems of uneven stress and bumping damage to a traditional volume bomb glass window. When the constant volume bomb window is impacted, impact force can be effectively buffered, and volume bomb sealing is ensured. The constant volume bomb window comprises a constant volume bomb body, a circular glass window, an O-shaped sealing ring, a first metal washer, a second metal washer, a pressing plate, bolts and nuts, the first metal washer and the second metal washer are the same in structure and positioned on two sides of the glass window respectively, annular bosses are arranged at the edges of the first metal washer and the second metal washer and face one side of the glass window, bolt holes are formed in the periphery of the pressing plate, one end of the bolt is fixed to the constant volume bomb body, and the other end of the bolt penetrates the bolt hole of the pressing plate and is connected with the nut, so that the O-shaped sealing ring, the first metal washer, the glass window, the second metal washer are fixedly compressed between the constant volume bomb body and the pressing plate.

The invention provides an annular sintering machine for water seal. Inner and outer-side breast boards, a connecting beam and inner and outer-side rotating frame form a rotating body together, and an annular water seal device is arranged under the rotating body and is positioned between the lower part of the rotating body and a bellows; the water seal device is an annular continuous body, and comprises an inner-side annular water seal device and an outer-side annular water seal device. A grid section is arranged on a supporting rack, one end of the supporting rack is connected with the connecting beam, and the other end of the supporting rack is suspended; the suspended end of the supporting rack and the rotating body are locked by a locking device; before entering a discharge area and when leaving the discharge area, an unlocking device and a locking device of the supporting rack are respectively arranged; a guidance device for turning the supporting rack down is arranged in the discharge area. The annular water seal structure is realized, the sealing effect is improved, and the air leakage amount is reduced by 30 to 40%; the rotating structure is simple, the weight is light, and the cost is low; through the improvement on a walking device, the number of air leakage points is reduced, and further the air leakage rate is reduced; the power consumption is reduced, and the operating environment is improved.

The invention discloses a door-seal device in a steam sterilization cabinet and mainly includes a caulking groove, which is fixed at a doorframe of a cabinet body. The door-seal device is characterized in that a hollow closed sealing strip is arranged in the caulking groove; an inflation tube is arranged on the hollow closed sealing strip and communicates with an internal cavity of the hollow closed sealing strip. The invention has the advantages that under a shutdown state, compressed air can be inflated into the closed internal cavity of the hollow closed sealing strip, which makes the sealing strip can closely contact a door body and the cabinet body synchronously, and the sealing effect is greatly improved.

The invention discloses a closed self-dredging type biological filter membrane assembly, and belongs to the technical field of biological reactions. Real-time oxygen supply to microorganisms in a filtering process can be realized without an external aeration device, oxygen only needs to be conveyed into deformed oxygen storage balls before filtration until saturation is achieved, fine filtration and pollutant decomposition are carried out by a self-dredging filter disc in which microorganisms are cultured in this process, the impact effect of water flow makes the oxygen storage balls deform and shake in the process, and energy conversion balls in oxygen storage balls convert kinetic energy into heat energy in real time; the conveyed oxygen is forced to be released from a semi-permeable membrane to the self-dredging filter disc by utilizing the heating expansion characteristic of the gas, so the slow-release oxygen supply effect on the microorganisms is achieved, the gas can more easilydredge pore channels, blocked by pollutants and microorganism metabolites, in the self-dredging filter disc, than water, and the effect of dredging the pore channels can also be achieved during explosion impact of bubbles formed by sewage, thereby the effects of closed filtering and real-time self-dredging are achieved.

The invention discloses a centre revolving joint which comprises a fixing shaft and a revolving body sleeved on the fixing shaft. The revolving body is in sealed connection with the fixing shaft in a rotating mode, and the revolving body is formed by at least two segments of sub revolving bodies in a splicing mode. Compared with the prior art, the revolving body of the centre revolving joint is formed by the at least two segments of sub revolving bodies in the splicing mode, therefore, in the process of actual processing, firstly rough turning and accurate grinding are carried out on an inner hole of each segment of sub revolving body until the inner hole conforms to the precision requirement for the assembling process, and the at least two segments of sub revolving bodies are spliced and then are assembled with the fixing shaft. Obviously, machining of the revolving body of the structure can be completed in a common lathe and a grinder, machining difficulty is reduced, the requirements for machining equipment are reduced, therefore, whole manufacturing cost of the centre revolving joint is reduced, and the production period of the centre revolving joint is shortened. On the basis of the structure, the invention further discloses a wheel type crane comprising the centre revolving joint.

The invention provides a fast connection mechanism, belongs to the technical filed of machinery and solves the problems that the clamping of connecting pipes is not tight, the connecting pipes are loosened and the sealing effect is poor after long time use of existing fast joints. The fast connection mechanism is arranged at the connecting end of a shell and comprises an inserting pipe, a seal ring and a clamping ring which is arranged between the inserting pipe and the seal ring; the clamping ring comprises an annular clamping ring portion and a plurality of clamping teeth portions which are distributed at the inner edge of the clamping ring portion; the end, not connected with the clamping ring portion, of each clamping tooth portion is inclined towards one side of the seal ring; the inner end of the inserting pipe can abut against the side, facing the inserting pipe, of each clamping tooth portion. The fast connection mechanism further comprises a nut; the inner side of the nut is provided with a first extruding surface; the clamping ring portion is located on the inner side of the first extruding surface; the clamping ring portion bends towards one side of the first extruding surface to form a protruding bent angle, and the side, opposite to the first extruding surface, of the bent angle abuts against the first extruding surface. The fast connection mechanism is firm in connection, good in sealing effect and low in replacement and maintenance cost.

The invention discloses a machining and polishing device of an equidistant rectangular steel bar. The machining and grinding device comprises a polishing rack composed of a base and a supporting frame, the supporting frame is internally provided with a polishing cavity, a through groove is formed in the side, close to the base, of the left side end face of the supporting frame, a raised part is fixedly arranged at the portion, at the inner wall of the right side of the polishing cavity, opposite to the right side of the through groove, an opening groove extending front and back is formed in the edge of the top of the left side of the raised part, a conical rack extending in the front and back extending direction of the opening groove is fixedly arranged in the inner wall of the right sideof the opening groove, a first threaded rod extending upwards is arranged on the top face of the side, away from the opening groove, of the raised part and is in cooperative threaded connection with alifting bracket slidably and cooperatively connected with the inner wall of the right side of the polishing cavity in an abutting mode, first baffles are symmetrically arranged at the front side andthe rear side of the lifting bracket, guide rods are symmetrically arranged at the upper side and the lower side between the first baffles at the front side and the rear side, and polishing executingmechanisms extending to the left side are slidably and cooperatively connected to the two sets of guide rods. The machining and polishing device is simple in structure, improves the polishing efficiency and quality and is high in polishing safety.

The invention relates to the field of automobiles, and specifically relates to a solar caravan. The solar caravan comprises a carriage and a solar power supply system, wherein living goods are arranged in the carriage; the solar power supply system comprises a solar cell panel, a controller, an inverter and a storage battery which are sequentially connected; a storing chamber for storing the solar cell panel is arranged in the top part of the carriage; the storing chamber communicates with the inner part of the carriage, and a mounting rack is arranged at the bottom part of the storing chamber; at least three vertical telescopic rods which are non-collinear are arranged on the mounting rack; the solar cell panel is mounted on the top parts of the telescopic rods. The solar caravan has the beneficial effects that the solar cell panel can extend out through the telescopic rods to enable the carriage to communicate with the outside in a sunny day, so that the air quality and light in the carriage can be ensured; meanwhile, the length of each telescopic rod can be adjusted according to the position of the sun in order to enable the solar cell panel to face the sun, and as a result, more energy can be absorbed by the solar cell panel, and the energy for living in the caravan can be ensured.

The invention relates to an auxiliary resetting gas spring which is provided with a cylinder barrel, a piston and a piston rod, wherein the cylinder barrel is internally provided with a damping seal structure so that not only can the piston rod be sealed, but also a damping effect on the piston can be achieved; a triangular apex angle part of a seal ring is in contact with the piston rod, so that the seal effect is further improved; and the cylinder barrel is internally provided with a compression spring, and the compression spring is capable of not only achieving a buffering effect on the piston, but also providing pull force and push force, assisting the back-and-forth movement of the piston and preventing excessively high or low resetting speed of the gas spring.

The invention discloses a cable junction box, which comprises a box cover and a box body, wherein the box body and the box cover are connected through screw bolts or screws; a wiring cavity is formed between the box cover and the box body; a plurality of sealed wiring pipes are also fixed at two sides of the box body; a plurality of wire distribution convex strips in uniform distribution are also arranged in the box body; wire distribution grooves are formed between the wire distribution convex strips and the inner wall of the box body, and between the adjacent wire distribution convex strips; positioning posts are also arranged in the box body; a positioning base is arranged on the box cover; convex strips are arranged on the box body; the convex strips are arranged at the connecting end of the box body and the box cover and are integrally formed with the box body; grooves matched with the convex strips are formed in the box cover; a sealing pad is bonded at the inner wall of each groove. The cable junction box has the advantages that the structure is simple; the manufacturing cost is low; the wire distribution is tidy; the sealing performance is high; the water immersion is effectively prevented; the influence on signal collection and transmission is avoided; the accuracy is high; the safety performance is good.

The invention relates to a double-row spherical roller bearing double-lip sealing structure and a wind driven generator, and belongs to the related technical field of wind power equipment. The double-row spherical roller bearing double-lip sealing structure mainly comprises an inner sealing ring; a pressing plate is arranged on the sealing ring; the inner side of the pressing plate is provided with a sealing ring body, a bearing end cover and a double-row spherical roller bearing body; the sealing ring body comprises a sealing ring body top which is connected with one end of a bent waist part, the other end of the bent waist part is in sealing connection with a vertical transition part, and the vertical transition part is connected with the bottom of the sealing ring body; and the lower surface of the bottom of the sealing ring body is provided with a first sealing lip and a second sealing lip. According to the double-row spherical roller bearing double-lip sealing structure and the wind driven generator, by improving a sealing ring body in an existing roller bearing sealing structure, the problems of sealing failure and leakage of the original sealing structure under special working conditions are effectively solved through the double-row spherical roller bearing double-lip sealing structure.

The invention discloses an end sealing device for air box of sintering machine, which comprise a top sealing plate, a link mechanism, an end sealing plate, a crossbeam frame, two side beams, and two bearing beams, wherein the crossbeam frame and two ends of each bearing beam are respectively connected with the two side beams, the link mechanism is fixed on the bearing beam, the top sealing plate is connected at the upper place of the link mechanism, the upper part of the end sealing plate is connected with the top sealing plate, the upper part of the end sealing plate contacts with the crossbeam frame, the top sealing plate is a trough sheathed at the inner sides of the two side beams and having a downward opening, the trough is composed of an elastic whole plate and two side plates disposed at two sides of the elastic whole plate, a top lining plate is provided at the top of the elastic whole plate, and two side lining plate is disposed at the outer sides of the two side plates. The end sealing device for air box of sintering machine has the advantages of good sealing effect, long service life, simple structure, and convenient preparation.

The invention provides a road soundproof panel, which comprises a strip-shaped base plate, a vertical substrate, a vertical joint plate, a vertical extending plate, an inclined joint plate, an inclined extending plate and an installing bolt; the vertical substrate is vertically installed on the strip-shaped base plate; assembling insert slots are arranged at upside and downside of the vertical joint plate and upside and downside of the inclined joint plate; the vertical substrate and the vertical extending plate can be combined and installed by means of the vertical joint plate; the vertical extending plate and the inclined extending plate are jointly installed by the inclined joint plate and fixed by the installing bolt. The road soundproof panel adopts the combined installation, is convenient to transport and has good soundproof and sound absorption effects.

The invention discloses a lung-simulated device of a respirator for emergency caring. The device comprises a bottom plate, a fixing frame is arranged on the right end of the upper surface of the bottom plate, an air bag is arranged in the fixing frame, a ventilation pipeline is arranged at the upper end of the air bag, a manual valve is arranged on the side face of the ventilation pipeline, an adjusting device is arranged at the lower end of the side face of the air bag, a first connecting pipe of the adjusting device is connected with the air bag, an air pump and a humidifying device of the adjusting device are fixedly connected with the left end of the upper surface of the bottom through fixing seats, an air pressure detecting device is arranged in the middle of the side face of the airbag, an air outlet pipeline is arranged at the lower end of the side face of the air bag, and a flowing speed regulator is arranged on the side face of the air outlet pipeline. The device has the advantages of being simple in structure, detection and adjustment can be conducted on the temperature, humidity and air pressure of the interior of the air bag, simple lung environment can be simulated tomake the adjustment of the respirator convenient, rapid using of the respirator is convenient, time is saved, operation is simple, and the using of the device is convenient.

The invention discloses a low-speed rotary sealing device which comprises a shell, a rotary shaft, a fixed shaft, an end cover, a rough sealing gasket and a main sealing ring. The rotary shaft and the fixed shaft are sleeved with the shell. The rotary shaft is sleeved with the end cover. The end cover presses one end face of a boss I arranged on the outer circle of the rotary shaft and is connected with one end face of the shell. A flange plate connected with the other end face of the shell is arranged on the outer circle of the fixed shaft. A boss II is arranged on the inner circle of the shell. One end face of the boss II is in sealing fit with the other end face of the boss I through the rough sealing gasket. The rotary shaft is sleeved with the main sealing ring which is pressed between the rotary shaft and the shell. Three seals are arranged according to use conditions. The rough sealing gasket is designed at the position, communicated with the outside world, of the device and mainly used for solving the problem that particles in the outside world enter the main sealing ring to cause damage; and auxiliary sealing rings are designed at the two ends of the main sealing ring and can effectively reduce the pressure produced after inner high-pressure liquid permeates out, so that the sealing effect of the main sealing ring is improved.

The invention provides a sealing ball valve, which includes a valve body and a valve core ball, the valve core ball is arranged in the valve cavity of the valve body, and also includes a sealing ring and a compression ring, and the sealing ring is arranged in the valve cavity. Between the valve core ball and the valve body, the compression ring is arranged in the first hole of the valve body and pressed against the flange of the first skeleton of the sealing ring. In the sealing ball valve provided by the present invention, the setting of multiple lips of the sealing ring can enhance the sealing effect of the sealing ring. The setting of the spring can enhance the sealing performance between the sealing ring and the ball of the valve core. In addition, the inclined plate presses the first lip and the elastic force of the coil spring can compensate the gap between the sealing ring and the ball of the valve core due to wear. Maintain the tightness between the sealing ring and the valve core ball, thereby achieving the purpose of prolonging the service life of the ball valve.

The invention discloses a contact type sealing structure suitable for a supercritical carbon dioxide compression unit. The sealing structure comprises a sealing body, first soft sealing tooth, a second soft sealing tooth, a shaft sleeve, a plurality of springs and a plurality of sealing teeth; the sealing body consists of an upper structure and a lower structure, wherein a clamping groove is formed in the bottom part of the upper structure, and the upper end of the lower structure is clamped in the clamping groove; one end of the springs is connected with the bottom part of the clamping groove, and the other end of the springs is connected with the upper end of the lower structure; the upper end of the sealing teeth, the upper end of the first soft sealing tooth and the upper end of the second sealing tooth are fixed on the lower end surface of the lower structure; the sealing teeth are located between the first soft sealing tooth and the second soft sealing tooth, and the shaft sleeveis located on the lower part of the sealing teeth, the first soft sealing tooth and the second soft sealing tooth. According to contact type sealing structure, the problem that the gap of the air seal is large due to the fact that the sealing teeth are worn by a rotor in the running process of the unit can be effectively solved, so that sealing effect is good.

The invention discloses a novel membrane electrode structure of a proton exchange membrane fuel cell. The structure comprises a proton exchange membrane, a catalyst layer, a gas diffusion layer and apackaging frame, at least one layer of protective frame is arranged between the gas diffusion layer and the catalyst layer, and the protective frame and the packaging frame are both provided with through notches with the same sizes and positions; the invention also discloses a packaging process of the membrane electrode. The process comprises the following steps: pre-setting a glue brushing blankarea on the protective frame and the packaging frame, pre-pressing the protective frame on the proton exchange membrane, and spraying a catalyst; the proton exchange membrane is subjected to hot pressing in advance by adopting the protective frame, and then the catalyst layer is coated, so that the mechanical strength performance and the positioning effect of the proton exchange membrane can be enhanced, and the problem that the proton exchange membrane is not easy to position due to swelling when the catalyst layer is sprayed is effectively solved; and the proton exchange membrane is prevented from being crushed and damaged by the edge end of the gas diffusion layer during hot pressing, and the glue overflow phenomenon of the membrane electrode during hot pressing can be effectively solved through the blank area brushed with the glue.

The invention discloses a smoke exhaust and ventilation fire resisting damper with high sealing performance. The smoke exhaust and ventilation fire resisting damper comprises a damper body; an executing mechanism is arranged on the damper body, and is connected with a temperature fuse; a plurality of blade fixing grooves are arranged on both the left inside wall and the right inside wall in the damper body; blade shaft sleeves are arranged on the blade fixing grooves; blade shafts are arranged in the two corresponding blade shaft sleeves in an inserting and sleeving manner; blades are arranged on the blade shafts, and are connected through a blade connecting rod; weather strips are fixed on the top surface and the bottom surface in the damper body, and are long strips bent to form obtuse angles; one side of each obtuse angle is fixed on the top surface or the bottom surface in the damper body, and the other side of each obtuse angle is a bevel side; and upper grooves protruding backwards are formed in the upper parts of the blades. After heated, side sealing plates, middle side sealing plates and arc-shaped sealing plates are clung to the blades, so that the sealing effect of the fire resisting damper is improved greatly, and the air leakage rate is reduced.

The invention relates to the technical field of underwater ceramic carrying platforms, in particular to an underwater electric double-shaft pan tilt which comprises a horizontal movement unit, a vertical movement unit, a pan tilt fixing unit and a device carrying unit. The horizontal movement unit is vertically fixed to the lower end of the vertical movement unit which is horizontally placed. The pan tilt fixing unit is fixed to the upper end of the vertical movement unit. The device carrying unit is fixed to the lower end of the horizontal movement unit. The oil pressure sealing mode adopted by a traditional underwater pan tilt is replaced, sealing is achieved through a star-shaped ring, the structure is simple, the sealing effect is greatly improved, modularized design is adopted, and the design and machining difficulty is lowered; the horizontal movement unit and the vertical movement unit adopt the same design, and therefore the machining and assembling difficulty is greatly lowered.

The invention discloses a mechanical seal of an anti-corrosion centrifugal pump, comprising a stationary ring, a movable ring and a stationary ring base. A shaft sleeve is sleeved on a pump spindle. The movable ring is sleeved on the shaft sleeve. The stationary ring is installed on a rear pump cover through the stationary ring base. A spring base is sleeved on the shaft sleeve. The spring base is fixed on the rear pump cover. A pressure spring is arranged between the stationary ring base and the spring base. A cooling water access channel is arranged on the rear pump cover. On the one hand, the temperature of the stationary ring and the movable ring is reduced by the cooling water to improve the sealing effect there-between, on the other hand, the particles from abrasion of the stationary ring and the movable ring are washed by circulation of the cooling water to prevent the particles from accelerating abrasion between the stationary ring and the movable ring and to improve the service lives of the stationary ring and the movable ring. The product is widely applied to the anti-corrosion centrifugal pumps for conveying highly corrosive liquid in the industrial production processes such as petrochemical industry, metallurgy, smelting, electric power, synthetic fibre and food, etc.

The invention discloses an automatic telescopic sealing device for compact shelves. The automatic telescopic sealing device comprises compact shelf bodies, wherein two or more linear motors with control circuits are arranged at the inner side of a side panel of a column of compact shelf bodies in two adjacent columns of compact shelves, all the linear motors are vertically distributed in the side panels of the compact shelf bodies, a moving shaft of each linear motor is connected with a sealing strip base, and a sealing strip for sealing the side panel of each of the two adjacent columns of compact shelf bodies is embedded in the corresponding sealing strip base; and meanwhile, a shelf side panel opening matched with each sealing strip base is formed in the side panel of each compact shelf body, each sealing strip base freely enters and exits the shelf side panel opening under the drive of the corresponding linear motor, and the sealing strips are used for sealing or is separated from the side panels of the adjacent columns of compact shelf bodies under the drive of linear telescopic movement of the linear motors. The aims of keeping the side panels of the adjacent columns of compact shelf bodies in a favorable sealing and closing state and keeping the closing and sealing effects between an upper surface and a lower surface after the adjacent columns of compact shelf bodies are closed are effectively achieved.