214 results about "FLANGE CAP" patented technology

The invention relates to the technical field of low-temperature cooling, and provides a cold shield self-pressing cooling device which comprises a vacuum cavity and a refrigerating machine arranged on the vacuum cavity. The first cold shield flange, the first-stage cold shield and the second cold shield flange form a first-stage cold shield cavity, and the first-stage cold shield cavity is embedded in the vacuum cavity; the first cold shield flange is connected with the bottom end of the first-stage cold shield; the spring assembly is arranged between the second cold shield flange and the top end of the vacuum cavity; and the to-be-cooled test cavity is located in the first-stage cold shield cavity. According to the cold screen self-pressing cooling device, the spring assembly is used for covering the second cold screen flange to the top end of the first-stage cold screen, and the spring assembly can be stretched or compressed when subjected to axial force; by arranging the spring assembly, when the vacuum chamber is closed, the second cold shield flange and the first-stage cold shield can be automatically pressed, so that the assembly difficulty of the first-stage cold shield chamber is greatly reduced, and a certain space can be reserved for the height design of the first-stage cold shield.

The utility model relates to the technical field of machining, in particular to a high-precision rotatable auxiliary supporting device which comprises a rotating center frame body, a rotating body arranged on one side of the rotating center frame body, four adjusting cavities arranged on the rotating body and clamping contacts arranged in the adjusting cavities in a sliding fit mode. The clamping contact comprises a flange cover arranged on the outer wall of the rotating body, a lead screw rotationally connected with the flange cover through a bearing, a nut and a threaded sleeve which are in threaded fit with the lead screw, a sliding sleeve connected with one end of the threaded sleeve, an ejector head arranged at one end of the sliding sleeve and located at one end of the lead screw, and a limiting open groove formed in the outer wall of the sliding sleeve. The locking mechanism is in threaded fit with one side of the rotating body and is in sliding fit with the limiting open slot; according to the device, the swing of the workpiece during supporting is reduced, the machining precision and the qualified rate are improved, the vibration problem in the high-precision machining process of the deep hole drilling and boring machine is solved, the machining precision of the whole machine is guaranteed, the industry development is promoted, and the machining efficiency and the product quality are improved.

The application provides a device and method for improving the filling density of solid working substance, which comprises a storage cavity for containing the solid working substance, wherein the storage cavity comprises a first opening; a flange plate fixed to the storage cavity, wherein the flange plate comprises a second opening corresponding to the first opening; a flange cover detachably fixed to the flange plate, wherein the flange cover covers the second opening and forms a sealed cavity together with the flange plate and the storage cavity; an air inlet valve and an air outlet valve fixed to the flange cover and communicating with the sealed cavity; and a vibration table for vibrating the storage cavity. According to the above, the application provides a technical solution, wherein the storage cavity is vibrated by the vibration table, so that the solid working substance contained in the storage cavity can be broken, and the filling density of the solid working substance can be rapidly improved.

The invention relates to the technical field of screw compressors, in particular to a high-internal-pressure-ratio casing structure of a screw compressor, which can measure a gap of a rotor at a discharge port under the condition that internal and external high pressure ratios are matched, and comprises a compressor casing, a rotor cavity is arranged in the compressor casing, a female rotor and a male rotor are arranged in the rotor cavity, and the female rotor and the male rotor are arranged in the compressor casing. The compressor is characterized in that an integrally-formed platform is arranged above the discharge port of the compressor shell, a through hole is formed in the platform, a flange cover with a shaft for sealing the through hole is arranged on the platform, the shaft of the flange cover with the shaft extends into the through hole, and the end of the shaft of the flange cover with the shaft is a curved surface matched with the inner wall of the rotor cavity. And an O-shaped ring is arranged between the flange cover with the shaft and the platform.

The utility model relates to an anti-theft device for an oil filling port of an oil storage tank on a drilling site. The anti-theft device comprises an oil filler threaded cap, an oil filler threaded pipe column, an oil storage tank manhole flange cover plate and an anti-theft lock. The oil filling port threaded cap comprises a nut and a cover plate, the nut and the cover plate are welded into a whole, the oil filling port threaded cap is in threaded connection with the oil filling port threaded pipe column, and the oil filling port threaded pipe column is fixedly connected to an oil storage tank manhole flange. The oil filling port threaded pipe column and the oil filling port threaded cover cap are respectively welded with a locking lug, the locking lugs are respectively provided with a round hole, and the anti-theft lock penetrates through the locking lugs on the oil filling port threaded pipe column and the oil filling port threaded cover cap and is locked with the locking lugs on the oil filling port threaded pipe column and the oil filling port threaded cover cap. The oil tank truck refueling device is simple in structure, convenient to use and high in working efficiency, not only can be suitable for refueling and theft prevention of different oil pipes of various oil tank trucks, but also has rainproof and dustproof effects, greatly facilitates high-position refueling operation, and improves refueling efficiency.

The invention relates to the technical field of safety monitoring of chemical equipment, and particularly provides an anti-explosion and anti-corrosion chemical sight glass device which comprises a base, a flange seat, a flange cover plate, a first sight glass and a second sight glass. A mirror base is arranged in the flange base, an air bag is arranged on the outer side of the flange base, and a discharge hole is formed in the inner side of the flange base. A spring pin is arranged at the upper end of the inner side of the flange seat, the mirror seat is connected to the spring pin, and the mirror seat can adjust shielding and avoiding in a self-adaptive mode relative to the relief hole according to pressure changes. Through a linkage mechanism of the air bag, the relief hole and the spring pin, the mirror base can automatically move upwards to relieve pressure when the pressure is suddenly increased, precise resetting and sealing are achieved after pressure relief, and the risk that the sight glass bursts is greatly avoided; the annular distributor is matched with the multiple nozzles to spray nitrogen to the bottom of the first sight glass, a dynamic gas film is formed through an arc-shaped annular section, and corrosion medium isolation and mist elimination are synchronously achieved; and the double-sight-mirror redundancy design provides an emergency observation window when the main sight mirror fails, so that the safety of the device is remarkably improved.

The utility model relates to the technical field of biomass boiler slag coolers, and discloses a blockage clearing device of a biomass boiler slag cooler, which comprises a slag cooler charging barrel end plate, a blockage clearing mechanism is arranged in an inner cavity of the slag cooler charging barrel end plate, the blockage clearing mechanism comprises a flange seat and a flange cover, one side of the flange seat is fixedly provided with a fixing seat, and the other side of the flange seat is fixedly provided with a baffle. A threaded hole is formed in an inner cavity of the flange base, and a positioning ring is fixedly installed on one side of the flange cover. The blockage clearing mechanism is arranged on the original end plate of the material barrel of the slag cooler, the fixed seat is welded in the inner cavity of the end plate of the material barrel of the slag cooler, the flange cover and the flange seat are connected through the connecting bolt, refractory castable has good heat resistance, foreign matters in the slag cooler are manually taken out after the flange cover is detached, and the blockage clearing mechanism is convenient to use. Foreign matters such as iron wires in the slag are prevented from blocking the slag spraying holes, and the feeding system device of the slag cooler does not need to be disassembled, so that a large amount of manpower and time are saved.

The application discloses an adaptive ball head entering device, which comprises a base, a three-dimensional force sensor installed on the base, a bearing seat installed above the three-dimensional force sensor, a flange cover installed above the bearing seat, a locking cover installed above the flange cover, a ball head seat installed in the flange cover, the ball head seat being located above the bearing seat and a tapered roller bearing being arranged between the ball head seat and the bearing seat, a first central through hole being arranged on the ball head seat, an adaptive positioning section being arranged at the upper end of the first central through hole, and an inner conical surface being arranged on the inner wall of the adaptive positioning section; a second central through hole for the ball head to enter and exit is arranged in the flange cover, a third central through hole for the ball head to pass through is arranged on the locking cover; a control mechanism for controlling the ball head is arranged on the flange cover; the control mechanism comprises a locking through hole arranged in the side wall of the second central through hole, a locking pin installed in the locking through hole and a control driving mechanism for driving the locking pin to move along the locking through hole between a free station, an anti-escape station and a locking station.

This utility model relates to the field of flipping tooling technology, specifically to a rapid flipping device for flange covers. The flipping platform of this utility model is disc-shaped, its size matching the flange cover size. A rubber pad is provided on its surface, and flipping shafts that cooperate with the flipping mechanism are provided on both sides. A hinge seat that cooperates with the drive mechanism is provided on one side of its bottom, and an arc-shaped baffle is provided at the front edge of the flipping platform corresponding to the hinge seat. The flipping mechanism includes two hinged supports, and the support mechanism includes a rear baffle support column. The drive mechanism includes a hydraulic jack, and the buffer mechanism includes a disc-shaped flipping buffer pad. The hydraulic jack enables slow, unidirectional flipping, ensuring the flange cover lands smoothly and preventing damage to the sealing strips. Simultaneously, the rear baffle support column and baffle prevent accidental impact or excessively rapid sliding, and the rubber pad and buffer pad effectively absorb impact, improving operational safety. The device has a simple structure and low manufacturing cost.

The flange cover (1) has thimble-shaped fastening elements (3) that are integrally formed with a cover element (2) and extend transversely thereto to engage in respective through-holes (16) of a flange (14). At least one fastening element (3) has a lateral cam (6) in a section (4) adjacent to its distal end (5), which engages the respective through-hole (16) of the flange (14) in a form-fit and / or force-fit manner, wherein the width (18) of the section (4) with the cam (6) is less than or equal to the diameter (19) of the through-hole (16).

The invention relates to the technical field of water meter equipment, in particular to a metering mechanism of a horizontal helical vane type water meter, which comprises a flange cover, a bracket, an impeller, a rectifier, a central gear, a transmission gear set and a baffle plate, and a rotating shaft of the impeller is rotatably supported between the rectifier and the baffle plate. The first gear and the second gear are meshed with each other to form the first gear pair used for converting rotary motion of the impeller into rotary motion of the transmission gear shaft, the first gear pair can be effectively meshed under any working condition due to the fact that the first gear and the second gear are both involute cylindrical gears, and even if the impeller axially moves by 5 mm to the maximum, the first gear pair can be effectively meshed with the second gear pair. Due to the characteristics of the cylindrical gears, meshing of the cylindrical gears cannot be separated, only slight relative sliding in the tooth width direction exists, influences on transmission stability and efficiency are extremely small, the contact area of the cylindrical gears is far smaller than the sliding contact area between the worm gear and the worm, and friction resistance of the cylindrical gears can be remarkably reduced.

The utility model provides a detachable square tube box pressing device, which adopts an inner and outer double-module mechanical sealing structure and comprises an inner force bearing module, an outer force bearing module, an outer force bearing module, an inner force bearing module, an outer force bearing module, an inner force bearing module and an outer force bearing module, and is characterized in that the inner force bearing module is an adjustable I-shaped steel cross arm provided with a telescopic mechanism used for adapting to square tube boxes with different widths; the dynamic sealing module comprises a sealing plate, a pull rod group and a quick-release flange assembly; the sealing plate and the flange cover are provided with pressure test interfaces which are used for connecting a pressure source and pressure detection equipment. The hydraulic telescopic arm has the advantages that the hydraulic telescopic arm structure of the adjustable I-shaped steel cross arm can quickly adapt to square tube boxes of different width specifications, and the traditional blind plate welding procedure is thoroughly eliminated; through the pull rod group and the quick-release flange assembly of the dynamic sealing module, the test device can be quickly mounted and dismounted.

The utility model relates to sulfur recovery equipment technical field, specifically a spring formula sulfur seal device, including inner cylinder, the inner cylinder is connected liquid sulfur entrance inner connector and liquid sulfur export inner connector respectively, the inner cylinder inside is provided with the plunger, and the inner cylinder inside fixedly connected with plunger seat, plunger seat sets up in the lower part of plunger, and the plunger blocks liquid sulfur export inner connector, and the inner cylinder top sets up cylinder top flange cover, and the cylinder top flange cover slidingly connects with the limiting rod, and the limiting rod penetrates cylinder top flange cover and extends into the inside of inner cylinder, the limiting rod is connected with plunger, and the spring is movably sleeved outside the limiting rod. In the utility model, when the plunger lower part cavity pressure increases, the plunger and spring, limiting rod etc. move upward under the action of pressure, when the spring moves to the inner cylinder top, the plunger extrudes the spring, when reaches certain setting pressure value, the plunger bottom is higher than liquid sulfur export inner connector, makes liquid sulfur flow.

The utility model provides a kind of planetary gear reduction motor, including motor, still including the reduction component being connected with motor;Motor shaft of motor is processed with sun gear, planetary carrier is rotatably connected with planetary gear, and planetary gear is engagedly connected with sun gear and gear ring;First ladder is provided on the outer wall of planetary carrier, first bearing is installed at first ladder, first recess is opened in the inner wall of output flange cover, the inner wall of gear ring is provided with second recess, after output flange cover is connected with gear ring, first bearing is located in first installation groove.The utility model in the present application cancels the radial force received by planetary gear by first bearing, effectively avoids that planetary gear bears additional radial load.Through the radial force risk of offsetting planetary gear, the vibration and noise caused by uneven stress can be greatly reduced, the overall reliability of the system is effectively improved, and the failure probability caused by component wear is reduced.

This invention provides a flat gate valve and its usage method, relating to the field of natural gas development technology. The valve includes a valve body, a valve cover, and a tail cover, all three having a longitudinal cavity at their center. The valve body has inlet and outlet ends on both sides, forming a flow channel. A flange cover is located above the valve cover, housing a valve stem and a valve plate connected within it. A large handwheel extends from the top of the valve stem to the outside of the flange cover, driving the valve plate to open and close. A valve stem cover and a ball screw cover are located inside the flange cover. The valve stem cover and the ball screw cover are fixedly connected and rotatable. A nut is fixed inside the ball screw cover, and a ball screw is fitted inside the nut. A retaining ring is connected to the top of the ball screw, matching the inner diameter of the ball screw cover. The large handwheel drives the ball screw cover to rotate, thereby causing the nut to move up and down. The valve stem is connected to the bottom of the ball screw via a pin, achieving precise adjustment and opening / closing of the valve. This invention has good operability and spatial adaptability, while also facilitating the user's observation of the opening / closing position.

To provide a screw fastening structure using a flange cover which implements prevention of galvanic corrosion in a fastening structure for a screw with high versatility.SOLUTION: A screw fastening structure (TK) using a flange cover comprises: a conductive screw member (2); a flange cover (1) mounted at a peripheral edge of a flange (22) or a head (21) of the screw member; a substrate (4) including a first through hole (4b) that a shank (23) of the screw member can pass; a conductive plate (3) including a second through hole (31a), that the shank can pass, electrically connected to a wiring pattern (4c) and disposed on the side of a first face (4e) of the substrate; and a female screw member (5) disposed on the side of a second face (4f) of the substrate. In a screw fastened state where the screw member to which the flange cover is mounted is passed through the second through hole and the first through hole and threaded to the female screw member (5), the flange or the head of the screw member is in contact with the plate in a contact portion, and the flange cover is adhered to the substrate or the plate while enclosing the contact portion.SELECTED DRAWING: Figure 2B

The application relates to a cast shell type EGR cooler which comprises an air inlet joint connected with an elastic structure with a bellows and a sleeve, the outer periphery of the elastic structure is fixedly connected with an input end flange cover, the input end flange cover is bolt-connected with one end of a cast pipe shell through an input end sealing gasket, the other end of the pipe shell is bolt-connected with a fixed structure and an output end flange cover with an output pipe joint through an output end sealing ring; the elastic structure is welded with a tube plate at one end of a tube bundle, and the other end of the tube bundle is welded with the fixed structure. One end of the tube bundle is provided with the fixed structure, and the other end is provided with the elastic structure, so that the dislocation between the pipe shell and the tube bundle due to thermal expansion and cold shrinkage is solved; the flexible structure of the double-layer bellows is used for compensating the axial displacement of a heat exchange core, the influence of thermal expansion and cold shrinkage on the heat exchange core is reduced, the double-layer bellows is placed at the air inlet end, the water inlet structure of the shell is combined, the water flow space is increased, and the uniformity of water flow is ensured.

The utility model discloses a support mechanism for a shield, which is used for being connected between a shell of an electric tool and the shield and comprises a flange body (1) used for being connected with the shell of the electric tool and provided with a step portion (11) protruding outwards in the radial direction. The step part is used for providing supporting force in the axial direction for the protective cover; the flange cover plate (2) is connected with the flange body, and the flange cover plate is used for being connected with a protective cover of the electric tool; the annular elastic supporting piece (3) is arranged on the step portion of the flange body, and the elastic supporting piece is used for exerting tensioning force on the protective cover in the radial direction and the axial direction in the assembled state.

The utility model discloses a vehicle wall threading device. The vehicle wall threading device comprises a threading flange, a flange cover and a flange cover anti-falling combination, the threading flange is fixed on a vehicle wall through a fastener, and a through threading hole is formed in the middle of the threading flange; the flange cover is located on the outer side of the vehicle wall, and the inner end of the flange cover is screwed on the threading hole; the flange cover anti-disengaging combination comprises an anti-disengaging pin and a flexible anti-disengaging rope, the anti-disengaging pin is perpendicularly fixed to the middle of the outer side of the flange cover, a connecting piece at one end of the flexible anti-disengaging rope is connected to the anti-disengaging pin in a sleeved mode, and a connecting piece at the other end of the flexible anti-disengaging rope is fixed to a flange plate of the threading flange through a fastener. According to the utility model, the structure is simple, the installation is convenient, a cable can penetrate into the vehicle from the outside of the vehicle only by opening the flange cover, and the flange cover is screwed on the threading flange after threading, so that dust, rainwater or mosquitoes can be effectively prevented from entering the vehicle, and a clean working environment in the vehicle is ensured.

The utility model discloses a sensor structure of a micro-small-caliber electromagnetic flowmeter, which relates to the technical field of electromagnetic flowmeter sensors and comprises a mold core, an inner shell is slidably clamped on the outer surface of the middle of the mold core, and two symmetrically distributed finished coils are arranged on each of the upper side and the lower side of the inner shell. Magnetic cores are installed in the middles of the two finished coils, magnetic pole heads are slidably clamped in the middles of the two magnetic cores, flat-head set screws are installed in the middles of the two magnetic cores in a threaded mode, and one ends of the two flat-head set screws make contact with one ends of the magnetic pole heads; the flange cover of the external interface assembly can be screwed through the third bolt to press the sealing surfaces on the two sides of the end face of the mold core, so that internal liquid cannot leak, meanwhile, external liquid cannot immerse into the meter body, the sensor changes an original lining process mode, a high-cost mold extrusion mode is abandoned, and the production cost is reduced. The manufacturing cost is reduced, and the manufacturing efficiency is improved.

The utility model discloses a line sealing stop valve relates to the field of stop valve. This line sealing stop valve includes valve body, sealing flange and valve stem spare, and sealing flange sets up at the top of valve body, and valve stem spare penetrates sealing flange and is connected with valve body, and sealing flange includes first sealing flange, flange cover and second sealing ring, and first sealing flane top is provided with second circular slot, and second sealing ring sets up in second circular slot, and first sealing flange outside is provided with thread, and flange cover inside is provided with second thread sleeve, and first sealing flange and flange cover are connected through thread and second thread sleeve screw thread. The sealing design of valve rod connection place changes from waterproof filler to sealing ring design, and the detachable flange cover is set, and the first flange is connected through the flange cover screw thread, and the second sealing ring is fixed in the second circular slot, so that the second sealing ring is closely connected with the valve rod, and the purpose of placing leakage is achieved.

The invention discloses a high-temperature gas cooled reactor control rod drive wire test device and a test method, the test device comprises a vertically arranged pressure-bearing container formed by connecting a plurality of pressure-bearing cylinders, the test device also comprises a deformation control device, the pressure-bearing container is a multi-degree-of-freedom pressure-bearing container, the top of the multi-degree-of-freedom pressure-bearing container is connected with a foundation through a mounting flange, and the deformation control device is connected with the deformation control device. A sealing flange cover is installed at the bottom of the multi-degree-of-freedom pressure-bearing container, the multi-degree-of-freedom pressure-bearing container is provided with a deformation unit, the deformation unit comprises a pressure-bearing barrel and an expansion joint installed on the pressure-bearing barrel, and the deformation control device is connected with the pressure-bearing barrel in the deformation unit and controls displacement of the pressure-bearing barrel. According to the invention, the expansion joint is adopted to enable the pressure-bearing container to generate controllable and settable deformation, and after installation, deformation units and deformation control devices arranged at different positions can generate various forms of deformation, so that more accurate control rod operation drive line simulation can be provided; and the control rod falling time and the performance life of the control rod drive wire can be conveniently researched.

The utility model discloses a tubular washing liquor distributor device special for an aluminum oxide filter. The tubular washing liquor distributor device comprises a bracket and a main pipe, the main pipe is connected with the support, flange covers are installed at the two ends of the main pipe, the flange covers are fixedly connected with the main pipe through flange fasteners, a water inlet is formed in the top of the main pipe, a plurality of branch pipes are arranged at the bottom of the main pipe, the bottom of each branch pipe is connected with a nozzle body, and the nozzle bodies are connected with the branch pipes through hoop structures. An opening is formed in the pipe wall of the nozzle body, an adjusting piston is arranged at the bottom of the nozzle body, and the adjusting piston is detachably connected with the nozzle body through threads. According to the utility model, the problems of small washing water amount and uniform washing water spraying required by small and medium-sized aluminum oxide filters can be effectively solved.

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.

A fixing device for transportation of large heavy-load equipment is characterized in that a transportation bracket is detachably installed on a transportation vehicle plate through a plurality of fixing mechanisms, each fixing mechanism comprises a supporting rod, a sleeve and a pull claw assembly, the supporting rods are fixedly arranged on the vehicle plate, the sleeves are connected with the bottom of the bracket through flange covers, the front ends of blind rivets are provided with four pull claws capable of being opened and closed in the radial direction, and the rear ends of the blind rivets are connected with piston rods; and a hole is formed in the upper part of the sleeve and is communicated with an external pressure source. According to the fixing device for transportation of the large-scale heavy-load equipment, the pulling claws are driven by hydraulic oil to clamp the supporting rods, and the loading and unloading efficiency is improved; by arranging the disc spring set, the stability in the transportation process is improved; and through the arrangement of the inner positioning sleeve and the outer positioning sleeve, the installation accuracy and convenience are improved.

The utility model relates to quick -opening blind plate device technical field, concretely is a new quick -opening blind plate, including quick -opening blind plate device main part, through in quick -opening blind plate device main part carries out the use, its sealed inner chamber sets up the mounting groove to the interval baffle and installs, carries out the butt joint to inside interval baffle no.

The utility model discloses a liquid level measuring device which comprises a flange cover, a flange, a heat dissipation base and a liquid level probe, the heat dissipation base is of a cylindrical structure, the flange, the heat dissipation base and a container wall are sequentially connected and communicated from top to bottom, the container wall is the side wall of a container containing measured liquid, the flange cover is connected to the upper end of the flange, and the liquid level probe is arranged on the flange cover. The upper ends of the liquid level probes are fixedly connected to the flange cover, the lower ends of the liquid level probes penetrate through the flange and the heat dissipation base in sequence and then stretch into the container, the joints of the liquid level probes and the flange cover are sealed and insulated through ceramics, the liquid level probes and measured liquid are connected to the same control circuit, and the number of the liquid level probes is at least two. And the end parts of the ends, extending into the container, of the liquid level probes are not flush with each other. A plurality of measuring points are integrated on a single measuring device, the dynamic change of the liquid level can be measured in real time, the sealing position of the liquid level probe and the flange cover is resistant to corrosion and high temperature, not prone to aging, simple in structure, convenient to install, low in machining and manufacturing cost and wide in application range.

The manhole structure comprises a manhole main body part and a flange cover, the manhole main body part comprises a manhole shell ring and a flange, a first heat insulation lining is arranged on the inner side of the manhole main body part, a second heat insulation lining is arranged on the inner side of the flange cover, and the manhole shell ring and the flange cover are arranged in the manhole shell ring. A butt joint is formed between the first heat insulation lining and the second heat insulation lining, a first edge strip is welded to the butt joint of the flange, first ceramic fiber paper is arranged between the first edge strip and the first heat insulation lining, and a second edge strip is welded to the butt joint of the flange cover. Second ceramic fiber paper is arranged between the second edge strip and the second heat insulation lining, a ceramic fiber felt is arranged between the first edge strip and the second edge strip, the first edge strip and the second edge strip are the same in structure and are both arranged in a conical ring shape, and thermal expansion grooves are formed in the first edge strip and the second edge strip from the inner side edge to the outer side edge of the conical ring shape; the thermal expansion groove is filled with the ceramic fiber felt after the ceramic fiber felt is installed and compressed, so that thermal expansion can be dealt with.

The main steam valve of the supercritical steam turbine comprises a valve shell, an inner valve cover is arranged in the valve shell (1), an inner hole of the valve shell (1) is further provided with a whole circle of threads for installation, the main steam valve further comprises a threaded ring (3), and the threaded ring is connected into the valve shell through the threads and axially fixes the inner valve cover and a sealing ring; a temperature measuring hole is formed in the outer circle of the valve shell and used for measuring the temperature of an inner cavity of the valve shell. A valve shell flange cover (2) is arranged on the upper end face of the valve shell and fixed to the end face of the valve shell through bolts. A valve core (9) is arranged at the right end of the inner valve cover and is fixed on the inner valve cover (4) through a positioning pin (13); a valve rod and a valve element connected with the valve rod are arranged in the inner valve cover, and a lining-shaped sealing ring is arranged between the valve rod and the valve element connected with the valve rod and between the valve rod and the inner valve cover. The contact faces of the valve element (9) and the valve seat are made of PVD tungsten metal or alloy coatings.

A pressure relief device comprises a pressure relief opening connecting pipe and a pressure relief opening flange at one end of the pressure relief opening connecting pipe, one side of the pressure relief opening flange is rotationally connected with a pressure relief opening flange cover through a hinge, one face of the pressure relief opening flange cover covers the pressure relief opening flange, and an armature is fixed to the side, opposite to the hinge, of the pressure relief opening flange cover. And the armature and a magnet arranged on one side of the pressure relief opening connecting pipe are attracted together, so that the pressure relief opening flange cover is tightly attached to the end face of the pressure relief opening flange. When the pressure relief device works normally, no pressure exists in the communicated container shell, but the communicated container shell can be sealed, when pressure suddenly occurs in the container shell, the pressure relief device can be rapidly opened, the internal pressure can be relieved in a large-flow mode, and the pressure relief device is simple in structure and particularly suitable for low-pressure large-flow relief occasions.