228 results about "Stuffing box" patented technology

A packing assembly to be disposed within a stuffing box defined by a fluid end of a body of a reciprocating plunger pump includes an elastomeric component and a wear component. The elastomeric component has an at least partially tapered inner diameter and an outer diameter and, in use, engages the stuffing box on the outer diameter and is axially compressed within the stuffing box. The wear component sealably engaging the elastomeric component across the at least partially tapered inner diameter and dynamically contacts the plunger to form a dynamic seal.

A system includes a fluid end having a fluid end face and a recess extending toward a base. The system also includes a pressure ring extending from the fluid end face, the pressure ring having a pressure ring bore diameter larger than a fluid end bore diameter. The system further includes an adjacent ring coupled to the fluid end, the pressure ring positioned between the adjacent ring and the base, wherein at least one fastener extends through an aperture of the adjacent ring to couple the adjacent ring to the fluid end. The system includes packing material positioned within at least a portion of the pressure ring bore, the packing material positioned such that axial movement toward the fluid end is blocked by the base.

The invention relates to the field of sealing element detection, and discloses a sealing performance detection device for a valve sealing element, which comprises an operation table, a first locking assembly is arranged on the operation table, the first locking assembly comprises a first air cylinder, and the output end of the first air cylinder is fixedly connected with a locking block through a piston rod. A linkage assembly is arranged on the side surface of the piston rod and used for synchronously transmitting driving force of the first air cylinder to the heat preservation cover and driving the heat preservation cover to move along the operation table. When the first locking assembly moves towards the end of the valve rod along the operation table and completes fixation of the valve rod, the heat preservation cover synchronously covers the stuffing box along with movement of the first locking assembly, a closed heat preservation space is formed, temperature fluctuation in the box is effectively reduced, uniform distribution of a temperature field is guaranteed, and heat preservation efficiency is improved. Meanwhile, the first air cylinder synchronously drives the first locking assembly and the heat preservation cover, an independent driving source does not need to be additionally arranged, and the heat preservation cover has the two-way adjusting capacity of continuous heat preservation and rapid heat dissipation.

A wear-resistant ceramic composite metal slurry pump for mineral processing. The slurry pump comprises a bracket (1), a bearing assembly (2), a stuffing box (3), a pump casing (4), and wetted parts; the wetted parts include a front liner (5), a rear liner (6), a throat bushing (7), and an impeller (8); the front liner (5), the rear liner (6), the throat bushing (7), and the impeller (8) each adopt a composite structure in which ceramic blocks are bonded to metal, and the ceramic blocks are bonded to a metal framework in wear-prone areas of the wetted parts by means of an adhesive.

The invention relates to the technical field of valves, in particular to an eccentric rotary valve which comprises a valve body, an upper valve rod, a lower valve rod rotationally arranged in the valve body and a valve element located in the valve body, the valve element is fixedly provided with an upper shaft diameter coaxially fixed to the upper valve rod and a lower shaft diameter coaxially fixed to the lower valve rod, and a valve seat and a limiting piece are arranged in the valve body; an upper stuffing box is arranged on the inner wall of the valve body, sealing stuffing is arranged on the inner wall of the valve body, an upper sliding bearing is jointly arranged on the peripheries, close to each other, of the upper shaft diameter of the upper valve rod and the upper shaft diameter of the valve element in a sleeving mode, and a stuffing pressing sleeve used for blocking a gap is fixedly arranged on the inner wall of an opening, facing the outside, of the upper stuffing box; the possibility that medium thrust borne by the valve element is conducted to the upper valve rod and the lower valve rod is effectively reduced, valve element position change caused by medium impact is greatly reduced, and the situation that the valve element deviates, and the valve rod additionally bears the medium thrust is avoided.

The invention discloses a lining high-vacuum regulating valve, which comprises a valve body and a valve rod arranged in the valve body, and further comprises a valve core connected with the valve rod and a valve cover provided with a stuffing box, and is characterized in that the inner surface of the valve body is coated with a first lining layer, and the first lining layer and the valve body form a conformal coating structure through a thermal forming process; the outer surface of the valve element is coated with a second lining layer, and the second lining layer and the valve element form a common coating structure through the thermal forming technology. Through the means of combining a high-temperature mold pressing injection molding process and a dovetail groove rivet composite structure, the industrial problems of stripping deformation of a lining material and a metal valve body and medium leakage under the high-vacuum working condition are solved, and the structural stability of the lining layer under the extreme negative pressure and the zero leakage effect of gas-liquid media are obtained; and the equipment reliability and environmental safety of vacuum distillation, negative pressure reaction and other processes in the fields of chemical industry, pharmacy and the like are remarkably improved.

The hollow containers (3, 4) are arranged above a hollow column (2), the hollow column (2) is arranged around the liquefied gas pump (P), and a cable (8) for installing / drawing the liquefied gas pump (P) penetrates through the central part of the containers (3, 4) from the lower part to the upper part. The containers (3, 4) are provided with: lower plate members (5, 6) having cable through-holes (9, 10), through which the cables (8) can pass, in the center thereof; and a cartridge member (12) provided around the cable through-holes (9, 10) in the center of the lower plate members (5, 6) and having a cable insertion hole (13) in the center, the cable insertion hole (13) allowing the cable (8) to be inserted therethrough. The cartridge member (12) is provided with opening diameter adjustment mechanisms (14, 20) that adjust the size of the opening diameter of the cable insertion hole (13).

The utility model relates to a novel thickener bottom stirring device. A conical bottom cavity is formed below the bottom of a thickener, an upper stirring shaft is rotationally connected with the bottom face of the thickener through a stuffing box, the stuffing box is provided with a matched stuffing gland, the space between the stuffing box and the upper stirring shaft is filled with stuffing, and a stirring impeller is arranged at the end, on the inner side of the thickener, of the upper stirring shaft. The transmission mode between the upper stirring shaft and the output shaft of the speed reducer all-in-one machine is chain transmission, so that the two shafts are not in the same vertical direction, and the speed reducer all-in-one machine is prevented from receiving a medium leaked from a stuffing box; the second protection plate is arranged on the upper stirring shaft, the edge of the second protection plate is located on the outer side of the first protection plate, the first protection plate is arranged on the bottom face of the cone bottom cavity, a closed pattern is formed on the bottom face of the cone bottom cavity, and leaked media are sealed to the area, deviating from the stirring shaft, of the bottom of the cone bottom cavity. The overflow port is formed in the outer side of the first protection plate of the cone bottom cavity, is lower than the top end of the first protection plate and is used for discharging leaked media.

The utility model relates to a jacket for a three-way fixed ball valve, and relates to the technical field of three-way ball valves. An inflow channel and two outflow channels are formed in the valve body, a valve cavity is formed in the valve body, the inflow channel and the outflow channels are communicated with the valve cavity, a communication assembly is arranged in the valve cavity and used for controlling communication of the inflow channel and the outflow channels, a stuffing box is arranged on the valve body, and a circulation assembly penetrates through the stuffing box. The valve body is sleeved with the clamping sleeve, and the stuffing box penetrates through the clamping sleeve. The valve has the effect that the valve body can be conveniently overhauled and observed.

A stuffing box assembly for a fluid end of a hydraulic fluid pump includes a first stuffing box member having a first plunger bore configured to receive a plunger of the hydraulic fluid pump and a plurality of seals. The first stuffing box member further comprises a first bore spaced apart from the plunger bore. A second stuffing box member has a threaded stuffing nut bore configured to receive a stuffing nut of the hydraulic fluid pump. The second stuffing box member further comprises a second bore spaced apart from the stuffing nut bore. A fastener is configured to extend through the first and second bores to secure the first stuffing box member to the second stuffing box member.

The utility model discloses a modularized artificial wetland experimental device which comprises a stuffing box, a plurality of groups of isolation net-shaped partition plates are arranged in the stuffing box from top to bottom, the interior of the stuffing box is divided into a plurality of groups of stuffing cavities through the isolation net-shaped partition plates, and wetland stuffing is arranged in the plurality of groups of stuffing cavities. A plurality of groups of arc-shaped sealing plates corresponding to the packing cavities are hinged to the packing box, sealing rubber strips for sealing are arranged on the edges of the arc-shaped sealing plates, and the sealing rubber strips are tightly pressed and attached to the edges of the packing box; according to the modularized artificial wetland experimental device, only the filler of a certain layer can be replaced under the condition that other layers are not influenced, so that an experiment can be quickly and effectively carried out, the use and the assembly are more convenient, the filler can be replaced according to experimental requirements, the convenience of replacing the filler is improved, and the working efficiency is improved. Therefore, the practicability of the equipment is improved.

The utility model discloses a pump shaft seal combined structure, which adopts a mechanical seal assembly and a packing seal assembly, the mechanical seal assembly is arranged at one end of a main shaft and is used for mechanically sealing one end of the main shaft; the packing sealing assembly is arranged at the other end of the main shaft and used for conducting packing sealing on the other end of the main shaft; the packing sealing assembly comprises a packing box, the packing box sleeves the main shaft, and a packing cavity is formed in the position, close to the main shaft, of the packing box. According to the utility model, the original double-end-face mechanical seal is changed into the single-end-face mechanical seal, and the single-end-face mechanical seal is made of common materials, so that the improvement cost is low; the stuffing box is arranged in the stuffing box and is used for keeping the muddy stuffing in a correct shape, so that the muddy stuffing is not plastically deformed during operation, and the sealing effect is good; the holes are formed in the stuffing box and are opposite to the holes in the stuffing box body, the muddy stuffing is injected into the stuffing box through the holes, and the stuffing box is convenient to use.

The utility model discloses a high-pressure regulating valve with excellent sealing performance, which belongs to the technical field of high-pressure air supply regulation and comprises a valve body, a sealing component, a valve cage, a valve component, a filler component, a sealing heat dissipation component and an execution component are mounted on the valve body, and the valve component for controlling fluid circulation is mounted at the lower end of the execution component. The sealing assembly, the valve cage, the valve assembly, the packing assembly and the sealing heat dissipation assembly are located on the inner side of the valve body. The valve cage comprises a valve cage bottom piece, a plurality of valve cage middle pieces, a valve cage upper cover and a valve cage gland. By means of the mode, through the arrangement of the valve cage middle piece, fluid scouring and cavitation erosion are relieved, and the service life of equipment is prolonged; through the arrangement of the inclined surface of the self-sealing ring and the elastic strain groove, the sealing effect of the self-sealing ring can be improved when the stuffing box receives pressure, and leakage of fluid is avoided; through the arrangement of the filler box, the filler gasket, the filler and the filler pressing sleeve, the heat transfer efficiency is improved, and the heat dissipation effect is improved through the cooperation of the cooling fins.

This invention relates to the field of control valve technology, and specifically discloses a control valve with an anti-leakage mechanism. A control component is rotatably connected to the top of the valve body, a buffer component is fixedly connected to the inner side of the valve body, and the side of a contact component is fixedly connected to the inner side of the valve body. The inner side of the contact component is threadedly connected to the side of the control component. The control component includes a valve stem, a rotating rod is fixedly connected to the top of the valve stem, and a valve core is fixedly connected to the bottom of the valve stem. This control valve with an anti-leakage mechanism, by providing a contact component, allows lubrication to reduce friction between the valve stem and the stuffing box, reducing wear caused by friction. When the wear on the valve stem surface is small, it can better fit with the packing, allowing the packing to more tightly fill the gap between the valve stem and the stuffing box, thereby reducing the possibility of media leakage and improving the valve's sealing performance.

A mounting jig 10 is provided with a jig body 11 comprising: a cylindrical barrel part 13 which is externally fitted to a shaft A and which has a tape member 1 wound around the outer circumference thereof; a driven gear 14 which is continuous with the barrel part 13 and which rotates together with the barrel part 13 upon receiving a rotational driving force; and a pressing pin 16 which presses an end part of the tape member 1 against the outer circumferential surface of the barrel part 13. The pressing pin 16 is configured so as not to hinder slide movement of gland packings 1a, 1b formed by winding the tape member 1 around the outer circumference of the barrel part 13, in a direction away from the driven gear 14 along the axial direction of the barrel part 13. The jig body 11 is configured to be attachable to a lateral side of the shaft A.

The invention provides a heat exchanger, and relates to the technical field of heat exchange, the heat exchanger comprises a cylindrical shell, a heat exchange tube group is arranged in the cylindrical shell, and the cylindrical shell is provided with a shell pass inlet and a shell pass outlet; the front tube box is connected with one end of the barrel shell in a sealed mode, the rear tube box is connected with the other end of the barrel shell in a sealed mode, and the heat exchange tube set is communicated with the interior of the rear tube box; the floating tube plate is arranged in the barrel shell and close to the other end of the barrel shell, and the floating tube plate can move along the axis of the barrel shell; and the stuffing box sealing structure is arranged between the floating tube plate and the inner side of the barrel shell, or the stuffing box sealing structure is arranged between the floating tube plate and the inner side of the rear tube box, so that a shell pass fluid medium can be effectively prevented from leaking out, the damage to the external environment is prevented, and the stuffing box sealing structure is suitable for occasions with inflammable, explosive and toxic media; the strength is high, the sealing performance is good, and safe and reliable operation can be ensured on the occasion with high shell side pressure.

The utility model provides a filler sealing structure for a slurry pump and the slurry pump. The filler sealing structure comprises a shaft sleeve, a packing, a sealing ring and a gland. The shaft sleeve is used for fixedly sleeving a shaft; the shaft sleeve and the shaft hole of the stuffing box form an annular cavity with one end open. The number of the packings is multiple, and all the packings are arranged in the annular cavity. The number of the sealing rings is multiple, and the sealing rings are arranged in the annular cavity. The shaft sleeve is sleeved with the gland, and the gland is used for blocking the opening of the annular cavity and limiting the packings and the sealing rings in the axis direction of the shaft sleeve. According to the packing sealing structure for the slurry pump and the packing sealing mode adopted by the slurry pump, the sealing effect can be effectively enhanced, meanwhile, due to the arrangement of the multiple sealing rings, abrasion to the shaft sleeve can be relatively reduced, the service life of the pump is prolonged, and practicability is high.

1. The name of the design product: mud pump accessories. 2. The use of the design product: packing box for plunger type mud pump, and integrated cylinder sleeve for plunger type mud pump. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view 1.

The utility model discloses an anti-slip device of a vibrating feeder, which is arranged on the upper part of a trough of a coke dry quenching and discharging system, is fixed with the trough through a hole channel and a manhole cover at the upper end of the trough, and comprises a coke blocking rod, a stuffing box, a gland, a packing and the like, the coke blocking rod is arranged in the middle of the stuffing box and the gland, and the packing is arranged in the middle of the gland. An anti-skid structure is arranged at the upper end of the coke blocking rod to prevent the coke blocking rod from rotating and moving downwards, the lower end of the coke blocking rod is inserted into coke in the material groove to prevent the coke chute phenomenon, and carbon monoxide gas in the material groove is prevented from leaking through the packing pressed between the stuffing box and the gland. The anti-slip device of the vibration feeder is reasonable in structural design, the coke blocking rods are convenient to press, only the manhole cover needs to be replaced, the anti-slip device of the vibration feeder is wide in adjusting range, different numbers of coke blocking rods are selected to be inserted according to the slip amount, and the operation cost is low.

The present invention discloses a mud pump cleaning mechanism for a shield machine, which relates to the technical field of mud pumps and includes a cleaning ring arranged between a water-blocking ring and a sealing structure, wherein a spiral guide groove is provided on the inner side of the cleaning ring, wherein the spiral guide groove is arranged around the outer circumference of the plunger, and the inlet of the spiral guide groove is connected to a water inlet pipe tangent to the spiral guide groove, wherein the water inlet pipe passes through a stuffing box and a plunger sleeve, and the outlet of the spiral guide groove is connected to a water outlet pipe tangent to the spiral guide groove, wherein the water outlet pipe passes through the stuffing box and the plunger sleeve. The present invention overcomes the pain points of low cleaning efficiency, high particle residue, and frequent maintenance of traditional technologies through the directional swirl of the spiral guide groove, dynamic pressure regulation, and structural innovation, thereby providing an efficient, reliable, and durable cleaning solution for the mud pump of a shield machine.

This utility model provides a high-temperature sealing triple eccentric butterfly valve, which exhibits high stability under high-temperature conditions. It includes a valve shaft, a valve body, and a valve plate. The top and bottom of the valve body have mounting holes for connecting the shaft. A fluid channel penetrating the valve body is formed in the middle. The valve plate is installed within the valve body. The valve shaft passes through the mounting holes, through a stuffing box and a bearing bracket, and connects to the valve plate located within the fluid channel. The mounting holes at the top and bottom of the valve body are connected to heat insulation seats. Dustproof rings and spacers fitted onto the valve shaft are installed on the inner sides of the two heat insulation seats. Heat dissipation valve covers are bolted to the ends of the two heat insulation seats furthest from the valve body. Heat dissipation fins are provided in the middle of each of the two heat dissipation valve covers. A stuffing box is provided at the end of each heat dissipation valve cover furthest from the valve body. Heat-insulating bearing brackets are also bolted to the ends of the two heat-insulating valve covers furthest from the valve body. A first heat-insulating cavity is formed in the middle of each of the two heat-insulating bearing brackets.

According to the corrosion-resistant hard alloy valve element and valve seat for the centrifugal machine, a plugging block capable of moving in the radial direction is arranged in a valve element and extends out of a plugging flow channel in advance when the valve element is closed, so that a complete spherical sealing face is formed in the valve element, and in the rotating closing process of the valve element, corrosive media are effectively prevented from entering a valve cavity; compared with the prior art, through the operation of isolating the corrosive medium, the sealing reliability and durability are remarkably improved, a complex stuffing box does not need to be configured for the valve rod, and the maintenance cost is reduced; meanwhile, the indicating cylinder and the indicating ball which are communicated with the valve cavity are arranged, and early warning can be conducted in time when leakage happens to the sealing face; in addition, the modular design of the integral valve body, the detachable valve seat and the valve core is adopted, so that the manufacturing and maintenance difficulty is reduced; a drainage cylinder and a guide ring are additionally arranged in a valve seat flow channel, direct scouring of media to a sealing face can be effectively relieved, and the service life of the valve is further prolonged.

The utility model provides a gap bridge bracket structure, which belongs to the technical field of fluid ends of plunger pumps and comprises a gap bridge bracket body, lower guide pipes are arranged on two sides of the bottom of the inner wall of the gap bridge bracket body, lower gap bridge bracket pressing blocks are slidably connected into the lower guide pipes, and upper gap bridge bracket pressing blocks are arranged at the tops of the lower gap bridge bracket pressing blocks. Guide connecting bases are arranged on the two sides of the top of the upper bridge pressing block, first high-strength bolt holes are formed in the four corners of the bottom of each guide connecting base, and second high-strength bolt holes are formed in the positions, corresponding to the first high-strength bolt holes, of the two sides of the top end of the upper bridge pressing block. According to the gap bridge bracket structure, movement of the guide connecting base is guided through the guide column, the moving stability of the plunger is improved, the concentricity of the power end and the pump head is ensured, the position deviation of the plunger is further reduced, and the service life of the plunger is prolonged. The damage to the stuffing box inner cavity is reduced.

The present invention belongs to the field of valve maintenance technology, and specifically relates to a nuclear island gate valve leakage ring rotation device. It includes a rotating bracket and a rotating handle. The rotating handle is fastened to the end of the rotating bracket. The rotating bracket is installed on the valve stem. The upper end of the screw is inserted into the rotating hole of the rotating bracket. The rotating handle is rotated, and the bottom end of the screw is inserted into the new lifting hole of the leakage ring. The rotating bracket includes four connecting rods. The ends of the four connecting rods are rotatably connected by end shaft hinges. Each end shaft hinge is connected to a telescopic mechanism. The end of the telescopic rod of the telescopic mechanism is provided with a roller supporting the valve stem. The rotating shaft of the roller is parallel to the valve stem. The middle part of each connecting rod is connected to a rod that can be inserted into the new lifting hole of the leakage ring. The two opposite telescopic mechanisms are connected to the rotating handle. The present invention can eliminate jamming and facilitate the removal of the leakage ring from the stuffing box.

The application discloses an experimental testing device and a testing method suitable for high-temperature lead-bismuth erosion, and belongs to the technical field of nuclear energy experimental testing devices. The device comprises a variable frequency motor, a motor support, a main shaft, a stuffing box, a shaft seat, a flange cover, a tank body, a mounting base, a test piece disc and a medium rotation prevention device. The output shaft of the variable frequency motor penetrates through the top cover of the motor support, the upper end of the main shaft is connected with the output shaft of the variable frequency motor through an elastic column pin coupling, and the stuffing box and the shaft seat are sleeved on the outside of the main shaft. The lower part of the motor support is detachably connected with the shaft seat, the shaft seat is detachably connected with the top of the flange cover, the flange cover is detachably connected with the top of the tank body, and the tank body is welded on the mounting base. The lower end of the main shaft extends into the tank body, and three test piece discs are arranged at equal intervals in the tank body, and test pieces are detachably installed on the test piece discs. The medium rotation prevention device is embedded in the tank body. The top edge of the tank body is connected with a protective gas inlet and a protective gas outlet, and the bottom is provided with a lead-bismuth medium inlet and outlet.

The application discloses a kind of dead zone-free discharge valve, including valve body, embedded branch pipe seat, valve stem, stuffing box, packing gland, valve cover, the valve body and embedded branch pipe seat integrally formed, the valve seat, inlet flow channel and outlet flow channel are equipped in the valve body, embedded branch pipe seat is connected with discharge pipeline or equipment, the valve stem is located in the center of valve body, from top to bottom including valve head, upper valve stem, connecting piece, lower valve stem and valve cover, the valve head is arranged in the upper end of upper valve stem, the upper valve stem is connected with lower valve stem by connecting piece, lower valve stem is lifted along with the lifting of upper valve stem, the valve head is engaged with valve seat, forms closed state, the upper end surface of valve head is substantially flush with the inner surface of process pipeline or equipment, forms theoretical dead zone-free space.The discharge valve structure is stable, and welding seam detection, heat treatment is convenient, effectively eliminates stress concentration, and safety factor is high.

The invention provides a split type adsorption tank and a method and system for treating washing water containing a solid catalyst. Sealing of the split type adsorption tank can be achieved through a stuffing box assembly; the solid catalyst in the solid catalyst-containing washing water is filtered by the split type adsorption tank through the filtering filler; the split type adsorption tank can be hoisted through the equipment flange, the stuffing box assembly and the overhauling lifting lug, the filtering stuffing is convenient to replace, and the operation efficiency and the overhauling safety of a system for treating washing water containing a solid catalyst are improved. By adopting the two split type adsorption tanks which are arranged in parallel, filtering and backwashing of washing water containing a solid catalyst can be synchronously carried out, the operation efficiency is improved, and recovery of the solid catalyst is realized; meanwhile, parking maintenance and cleaning are not needed, and the system operation period is effectively prolonged.

The utility model discloses a hydrating machine sealing device which comprises a hydrating machine body and a feeding auger, and the feeding auger is inserted into a sealing opening of the hydrating machine body. An annular stuffing box is connected outside a sealing opening of the hydration machine body, and sealing filler is arranged between the stuffing box and the feeding auger; the end, away from the hydration machine body, of the stuffing box is an open end which is provided with a sealing gland. An annular protrusion is arranged on the side, facing the stuffing box, of the sealing gland, and the annular protrusion is inserted into the stuffing box from the open end and tightly presses the sealing filler. The side, facing the sealing filler, of the annular protrusion is a pressing face, and the pressing face gradually inclines towards the direction of the sealing filler from the small-diameter side to the large-diameter side. An insert bush is installed on a shell of the feeding auger, the width of the insert bush is larger than that of the stuffing box, one end of the insert bush extends into the sealing opening, and the other end of the insert bush extends out of the sealing gland. According to the hydrating machine, the sealing performance between the feeding auger and the hydrating machine body can be improved.

The invention discloses a packing sealing structure applied to a high-pressure medium, and relates to the technical field of fluid mechanical sealing, the packing sealing structure comprises a pump body and a shaft body, the pump body is internally provided with a pump cavity, the upper end of the pump body is detachably provided with a stuffing box body, the stuffing box body is internally provided with a stuffing shaft sleeve, and the sealing cavity is internally provided with three groups of packing bodies; a lower water seal ring is installed between every two adjacent groups of packing bodies on the lower portion, a middle water seal ring is installed between every two adjacent groups of packing bodies on the upper portion, a packing gland is detachably installed on the surface of the shaft body above the uppermost packing body, and a pressure relief hole is formed in the surface of the packing box body on one side of the middle water seal ring. The lower water seal ring and the higher middle water seal ring are arranged in a grading mode, high-pressure media can be decompressed, gathered and integrated step by step, the pressure of the media is gradually attenuated to micro pressure from high pressure of a pump cavity, medium and low pressure leakage media are discharged in time in cooperation with the pressure relief holes, and the problems that a traditional single laminated packing is difficult to resist impact of the high-pressure media and prone to leakage are solved.