334results about How to "Good sealing performance" patented technology

A fitting for an end of a length of corrugated tubing forms a gas-tight metal-to-metal seal by rolling and folding an endmost corrugation into a axially extending annular groove in the fitting body. A ridged retainer grips the tubing corrugations above the endmost corrugation and is axially advanced into the fitting body by a nut. The cut end at the endmost corrugation of the tubing encounters the axially facing end of a tubular stub inside the fitting body and folds over itself and into the annular groove between the stub and the inside surface of the fitting body. A seal member is thus formed with a pair of substantially parallel sealing surfaces, and resides between the retainer and the outside surface of the tubular stub. The seal member forms a metal / metal seal with the tubular stub.

The invention relates to a multifunctional fiber splitting box relating to the technical field of optical fiber communication equipment. The multifunctional fiber splitting box is characterized in that the upper half part inside a box body is provided with a fiber storing and fusing disc; one surface of the fiber storing and fusing disc is provided with an optical branching device installation groove, and the other surface is provided with a fiber fusing disc; the part which is near to middle inside the box body is provided with an adapter bracket; an outdoor optical cable guide hole and a dish-shaped optical cable output end are arranged below the box body; an outdoor optical cable guided into the fiber splitting box, an optical fiber bundle tube with a protective layer removed, a steel wire playing a strengthening role on the outdoor optical cable and a dish-shaped optical cable are all fixed by special fixing structures; and the box body can be hung on a wall or a rod through a wall hanging fixing part or an anchor ear. The invention has the advantages of small and exquisite appearance, reasonable internal setting, very convenient wire arrangement, routing and connection, weather proofing and corrosion resistance and is especially suitable for the reconstruction of urban old areas and countries with dispersed residences; and in addition, one multifunctional fiber splitting box can meet the requirements of 16-32 dispersed resident families on FTTH (Fiber To The Home) directly carried out through the outdoor optical cable and can be popularized and applied due to low manufacture and usage cost.

The invention provides a portable on-site Brinell hardness tester comprising a lifting device (2), a hydraulic augmentor (6), a displacement sensor (4), a pressure sensor (7) and a display (5), wherein the hydraulic augmentor is fixed above the lifting device and moves up and down along with the lifting device; the displacement sensor is arranged above the pressure bar of the augmentor to be usedfor measuring displacement; and the pressure sensor is arranged below the compression bar of the augmentor to be used for measuring pressure. The portable on-site Brinell hardness tester has the characteristics of good hydraulic airtightness, no oil leakage, integration of processing devices and measuring devices, simple measuring process, high measuring efficiency and low price.

A vacuum regulating valve has a poppet type valve element supported so as to be brought into uniformly close contact with a valve seat disposed in a passage connecting two main ports. The valve element is connected to a valve stem by a connecting mechanism that allows the valve element to tilt relative to the valve stem. A piston included in a cylinder actuator moves the valve stem axially.

The invention relates to a high-pressure gas circuit connector which consists of a plug and a socket, wherein the plug comprises a gas circuit jack, a housing and a nut. The gas circuit jack is provided with a through hole through which high-pressure gas passes; the socket comprises a gas circuit contact pin, a housing and a tail sleeve; the gas circuit contact pin is provided with a through holethrough which the high-pressure gas passes; the plug of the connector is provided with an unlocking sleeve and a locking spring simultaneously; a gland bush and a gasket are arranged in the gas circuit jack; the unlocking sleeve is arranged on the front end of the gas circuit jack; the locking spring is arranged in a cavity formed by the housing, the unlocking sleeve and the gas circuit jack; thesocket is provided with a release sleeve and a release spring simultaneously; the circumference of the side wall of the front end of the housing of the socket is provided with a plurality of holes, inwhich corresponding steel balls are arranged, and each hole mouth is provided with a position limiting structure; and the release sleeve and the release spring are arranged between the housing and the gas circuit contact pin. Due to the sealing performance and a rigidity connection structure, the invention has a self-locking function and can bear and transmit gas with quite high pressure.

The invention relates to an anchor packer with a hydraulic setting function and a rotation unsetting function, and belongs to the field of borehole operation tools for oil gas wells. The anchor packer comprises a center pipe, an upper connector, a lower connector, a pair of slips, a piston sleeve and a release sleeve. The upper connector is arranged at one end of the center pipe, and a C-shaped ring is arranged at the other end of the center pipe. An inner sleeve is arranged on the portion, located on one side of the connector, of the center pipe. An upper slips cone and a lower slips cone are clamped to the inner sleeve through a cone release shaft and key blocks A. The slips are assembled between the upper slips cone and the lower slips cone. The anchor packer is compact in structure, setting and anchoring are achieved, and the unsetting mechanism is exquisite in design; setting is safe, it can be avoided that setting is conducted in advance, and step-by-step unsetting can be easily completed when multiple packers are used at the same time; and the problem that multi-stage unsetting is difficult in the prior art is solved. The anchor packer can bear the pressure from the position above the anchor packer and the pressure below the anchor packer, and is particularly suitable for water (gas) injection, interlayer isolation, split injection and split explosion, multilayer testing and stimulation measure operation in plumb shafts and slightly-deviated wells.

The invention provides an easy-stripping type room temperature vulcanizing silicone rubber, which contains hydroxy-terminated dimerization organic group siloxane, a functional filling material, a crosslinking agent, gas phase silicon dioxide, a catalyst, an additive and a plasticizer. The invention also provides a method for preparing the easy-stripping type room temperature vulcanizing silicone rubber, which comprises the following steps: firstly, vacuum-stirring the hydroxy-terminated dimerization organic group siloxane, the plasticizer and the functional filling material in formula proportions in a closed reaction kettle evenly; secondly, adding the crosslinking agent, the gas phase silicon dioxide, the catalyst and the additive in formula proportions in to the closed reaction kettle, and vacuum-stirring the mixture for 30 to 60 minutes; and thirdly, releasing the vacuum by using nitrogen gas, and putting the mixture into a closed packaging container. The easy-stripping type room temperature vulcanizing silicone rubber is particularly suitable for sealing a joint on the surface of a component of a motor vehicle, has excellent sealing performance and stripping performance, and simultaneously is of room temperature vulcanizing type, is cured by moisture, is molded in place and can replace various solid gaskets, so the easy-stripping type room temperature vulcanizing silicone rubber is suitable for manufacturing and maintaining various types of motor vehicles, and can shorten the labour hour and save the cost.

The invention relates to a fingertip seal structure and a back baffle plate thereof. The fingertip seal structure comprises a front baffle plate (1), a back baffle plate (2) and a plurality of layers of fingertip sheets (3) arranged between the front baffle plate and the back baffle plate, wherein each fingertip sheet is provided with a finger body (6) being a gap form the inner diameter position, and the finger bodies (6) between adjacent fingertip sheets (3) are mutually staggered. A plurality of arc-shaped pressure balance chambers (4) are arranged in the back baffle plate (2), the shape and the arrange means of the arc-shaped pressure balance chambers are consistent with the finger bodies (6), and the width is not larger than that of the finger bodies (6). Space exists between the arc-shaped pressure balance chambers (4) and the inner diameter of the back baffle plate (2), and at the same time the arc-shaped pressure balance chambers (4) are provided with through holes (5) communicated with the back baffle plate (2). The fingertip seal structure eliminates sealing lag and at the same time still can prevent the high-pressure gas in the arc-shaped pressure balance chambers from directly leaking to a low-pressure chamber, so the fingertip seal structure has good sealing performance.

The invention discloses a device and method for mounting a water pipe connector on the shell of a thermostat. The device comprises a mandrel and a mandrel sleeve; the mandrel sleeve is sleeved outside the mandrel; the external diameter of one end of the mandrel sleeve is matched with the internal diameter of the water pipe connector, and the end of the mandrel sleeve is circumferentially provided with at least one through hole; one end corresponding to the through hole, of the mandrel is provided with a conical section with a small end facing to the outside, and the other end of the mandrel extends out of the mandrel sleeve; the through hole of the mandrel sleeve is internally provided with steel balls, and the steel balls abut against the conical section of the mandrel and provided with brims protruding from the through hole; and a threaded matching section is arranged between the mandrel sleeve and the mandrel. The water pipe connector is well mounted on the shell of the thermostat in a sealing way by using the device and the method according to the mechanical stiff extrusion deformation principle. The components of the device have conventional shapes and simple structures and are easy to manufacture. The device has the advantages of low cost and good processing and sealing performances.

Provided are a pre-fabricated building removable partition, a wall splicing structure, and a construction method. The pre-fabricated building removable partition comprises a wall main body, and a partition removable mechanism and a partition lifting mechanism added on the lower side of the wall main body. The wall main body comprises a cavity formed by a front panel, a rear panel, an upper blanking plate, a lower supporting plate, a right end plate, and a left end plate. A hollow threading lightgage steel joist and cavity filling foam are arranged in the cavity. The partition removable mechanism and the partition lifting mechanism are fixedly connected with the lower supporting plate. The lower sides of the front panel and the rear panel are respectively connected with a skirting board shielding the removable mechanism and the lifting mechanism. Gaps are filled with the cavity filling foam. The top end face of the wall main body is provided with a sealing band which is abutted against a room roof. The pre-fabricated removable partition can be produced and assembled in a factory, and is lifted and installed on an installation site, and the pre-fabricated removable partition has good dimension stability and good sound insulation, and satisfies variable requirement of people on living space. The pre-fabricated removable partition can greatly improve utilization rate of a building space, and promotes development of buildings.

The invention discloses a plate air preheater by which the defects of heavy welding workload, long manufacturing cycle and the like of the traditional all welded plate air preheater are overcome. The technical scheme comprises the following steps: selecting two rectangular heat transfer plates, cutting off four corners, and folding edges, wherein one pair of edges is folded upwards, the other pair of edges is folded downwards, and the two folded heat transfer plates are buckled with each other in the vertical direction; carrying out riveting or bolting seal on the two buckled edges, carrying out welding seal on four corners of the heat transfer plates with steel angles to form single-channel plate cores, and buckling the single-channel plate cores two by two; and carrying out riveting or bolting seal on the two buckled edges to form a multi-channel plate core of which the channel directions alternately change. The invention is applicable to the petrochemical tube heating furnace and the flue gas waste heat recovery system of various boilers (industrial boilers, station boilers, industrial boilers and kilns and the like), and has the advantages of simple manufacturing process and good sealing property.

The invention provides a sealing device of a vacuum moving element, which comprises a moving element and a sealing ring matched with the moving element, wherein the inner hole wall of the sealing ring, matched with the moving element, is provided with a plurality of annular storing slots; the inner hole wall and the storing slots are all provided with sealing grease layers or lubricant layers; the outer wall of the sealing ring is provided with a plurality of outer ring slots; a sealing circle is embedded into each outer ring slot; and the sealing circles are matched with the sealing inner wall of a cavity body. The sealing device has the bidirectional sealing property, in particular the sealing of excellent sealing property in the frequent large-travel reciprocating motion for a long time under the vacuum or high pressure difference conditions; the inner hole wall of the sealing ring is provided with the storing slots capable of storing a certain amount of sealing grease or lubricant to effectively supplement the sealing grease or the lubricant taken way by the motion of the moving element so as to maintain the excellent sealing property at the same time of reducing motion resistance; and the pretightening force is supplied through the deformation of the sealing circle, the sealing circle can supplement the abrasion of the sealing ring, and thus, the service life of the sealing ring is prolonged.

The invention relates to a multilevel sealed medical puncture needle which is mainly suitable for abdominal cavity examinations and an abdominal cavity surgery. Seal rings, straight sealing caps, O-shaped rings and non-resistance seal rings are sequentially arrayed along the center line of an outer tube. After the outer tube is matched with a main body, the outer tube and the main body are sealed through the seal rings, and pressing caps and the main body are welded and then fixed through the straight sealing caps in sealing mode. Clamping caps and the pressing caps are matched and then sealed through the O-shaped seal rings, the pressing caps and the clamping caps are welded and then fixed through the non-resistance seal rings in a sealing mode, and a puncture cone is matched with the outer tube and then sealed through the non-resistance seal rings. Each non-resistance seal ring comprises crumple-shaped thin films and a shooting-type core disc. Each whole non-resistance seal ring is in an integral structure formed in a one-time mode. The multilevel sealed medical puncture outfit is reasonable in design, due to the non-resistance seal rings, the situation that the puncture outfit can move left and right without resistance and not leak when moving front and back in the process of puncturing can be guaranteed, therefore the gas tightness of the puncture needle is guaranteed and the situation that the puncture outfit freely moves in a puncture sleeve is guaranteed.

The invention provides a water testing tool of a water faucet, which belongs to the field of mechanical technique, and solves the problem that the existing water testing tool cannot be used for detecting the water faucet with a plurality of cavity bodies. The water testing tool of the water faucet comprises a base, wherein a plug I and a plug II are arranged on the base; an air inlet passage I is arranged on the plug I; an air outlet end of the air inlet passage I is communicated with a corresponding water inlet end; an air cylinder I is fixedly connected onto the base; a piston rod of the air cylinder I is connected with the plug II and can drive the plug II to horizontally move back and forth; a plug III capable of plugging a water outlet end of the water faucet is also arranged on the base; an air cylinder II is arranged on the base, and can drive the plug III to horizontally move back and forth; an air inlet passage II is arranged on the plug III; one end of the air inlet passage II is communicated with a water inlet end of the water faucet; and an air inlet end of the air inlet passage II can be connected with an air pipe. The water testing tool of the water faucet has the advantages of capability of detecting a plurality of cavities of the water faucet.

The invention provides a spiral pyrolysis reactor comprising a shell, a material inlet, a pyrolysis gas outlet, a heat carrier outlet and a powdered carbon outlet. The spiral pyrolysis reactor is characterized in that a vertical shaft is fixed in the center of the shell; a spiral baffle plate whose diameter becomes larger gradually is sleeved on the vertical shaft; a spiral bottom plate is fixed and sealed between the bottom of the spiral baffle plate and the vertical shaft from the middle-upper part of the vertical shaft; a spiral sieve mesh in fixed between the bottom of the spiral baffle plate and the vertical shaft from the middle-lower part of the vertical shaft; a spiral slideway is formed by the spiral baffle plate, the spiral bottom plate and the spiral sieve mesh; the upper end of the spiral slideway is supported at the bottom of the material inlet; the heat carrier outlet is arranged on the inner end of the shell and is supported on the tail end of the spiral slideway whose bottom is not sealed; a spiral supporting plate which rotates in the same direction as the spiral baffle plate is sleeved and fixed on the middle part of the spiral slideway whose bottom is not sealed, wherein the vertical shaft is arranged the on the middle part of the spiral slideway; the edge of the spiral supporting plate is slightly larger than the spiral baffle plate which is arranged on the spiral supporting plate and keeps a certain distance with the spiral slideway which is arranged above and below the spiral supporting plate. The spiral pyrolysis reactor integrates the biomass powder reaction with the separation device, has simple structure, good sealing performance and excellent working performance.

The invention discloses a drinking water bucket cover and a drinking water bucket provided with the drinking water bucket cover. The drinking water bucket cover comprises a cover body and an automatic sealing component, wherein one end of the cover body is used for closing the drinking water bucket, and the other end of the cover body is provided with an opening which is communicated with the interior of the drinking water bucket; the automatic sealing component comprises a first valve and a second valve; the first valve is provided with a blind hole and is provided with a first magnet; the second valve is provided with a through hole and is provided with a second magnet with magnetism opposite to first magnetism; the second valve is arranged at the opening and the through hole is communicated with the opening; the first valve is closely attached to the second valve to further seal the through hole through attraction of the two magnets. When the drinking water bucket is arranged on a drinking fountain in an inverted manner, a smart column on the drinking fountain is accommodated in the blind hole through the opening and the through hole, and the first valve is pushed away from the second valve, so that water in the drinking water bucket can flow through the smart column to enter the drinking fountain; the automatic sealing component realizes automatic sealing of the opening. The invention also discloses the drinking water bucket provided with the drinking water bucket cover.

The present invention relates to valve, and is especially household gas safety valve with pull-push device for locking and cutting off without accident action. The household gas safety valve consists of valve body, fixing frame, valve cover, coil holder, coil, magnet and valve core. It has also upper pull rod in the upper part of the valve core, lower pull rod in the lower part of the valve core, pad and sealing piece below the lower pull rod, and sealing jacket and spring outside the lower pull rod. The present invention has features of high sealing performance, long service life, etc.

The invention discloses an integrated anti-leakage type batching valve which mainly comprises a two-position combined cylinder, a large-flow conical valve, a small-flow conical valve and two compression springs, wherein the small-flow conical valve is arranged in the large-flow conical valve; and the opening and closing of the small-flow conical valve and the large-flow conical valve are controlled by the two two-position combined cylinder and the compression springs. The two-position combined cylinder can be controlled by an electromagnetic valve to produce three working states, namely a state that a material outlet is completely closed, a state that a small-aperture fine material outlet of the material outlet is opened and a state that the material outlet is completely opened. The integrated anti-leakage type batching valve has the advantages of compact and rational structure, good sealing property, high batching speed, high preparation precision and the like; the requirements on the batching speed and precision can be met, and meanwhile, the sanitary environment of a workshop is improved; and the integrated anti-leakage type batching valve is most suitable to be used in a batching system of a cigarette factory and is applicable to other automatic operation on liquid raw materials.

The invention provides an illuminating device and is applicable to the technical field of illuminating devices. The illuminating device comprises an electrical cabinet, a light reflecting cup and a luminous component, one end of the light reflecting cup is provided with a transparent piece and a first hemming portion which is used for compressing the transparent piece, and the luminous component is arranged in the light reflecting cup which is arranged on the electrical cabinet; the other end of the light reflecting cup is provided with a fixing ring and a second hemming portion which is used for compressing the fixing ring; at least two protrusion portions are protruded on the side surface of the fixing ring along the radial direction, and a snapping component which can act on the protrusion portions is arranged on the electrical cabinet; and a rope component is connected with the electrical cabinet and connected with a hang ceiling installation fastening assembly. The illuminating device is good in seal performance and product reliability and convenient to install and maintain.

The invention relates to a multifunctional hydraulic slippage overlapped full-closed engineering emergency car which comprises an emergency car body, a car large box chassis, a carriage front door and a car back door. The interior of the emergency car body is divided into an upper layer, a middle layer and a lower layer, a hydraulic water pump and a portable flame cutting machine are arranged on the upper layer, an electric welding machine and a plasma cutting machine are arranged in the middle layer, and a road surface hydraulic cutting machine, a hydraulic vibrating tamper and a hydraulic breaking pickaxe are arranged on the lower layer. Push-and-pull jacks are arranged on the two sides of the car large box chassis, a front door lock jack, a back door lock jack and a back door folding jack are arranged inside the carriage front door, an oil pump, a hydraulic oil tank and a hydraulic oil radiator are arranged on the lower portion of the emergency car body, a hydraulic crane, a crane winding machine and a crane main support arm jack are sequentially arranged in front of the back door lock jack, and a construction caution light is arranged at the top of the emergency car body. The multifunctional hydraulic slippage overlapped full-closed engineering emergency car is good in sealing performance, simple in structure, convenient to use, variable in function, low in cost and attractive in appearance.

The present invention is electroslag remelting apparatus and method with reduced oxygen content. The electroslag remelting apparatus has crystallizer, sealing cover over the crystallizer with oxygen pressure gauge, flow meter, vacuum set, etc. and features that the conducting rod and the consumable electrode are set inside the sealing cover and combined with sealing ring via sliding sealing. The atmosphere protection method for the remelting process includes vacuum pumping the inside of the sealing cover to 0.1-100 Pan and filling inert gas through the freeze drying machine into inside at pressure of 0.1-0.13 MPa. During the remelting process, the inert gas feeding amount or gas exhaust are controlled automatically. The present invention has reduced oxygen content in the remelting alloy and homogeneous alloy components as well as stable flow rate and constant pressure of inert gas in the remelting chamber.

The invention discloses a flammable ice sampling device which comprises a rope coring double-pipe structure, wherein the rope coring double-pipe structure comprises an outer pipe assembly and an inner pipe assembly; the outer pipe assembly comprises an outer pipe, a spring stop head, a recovery pipe and a coring drill bit; the spring stop head is installed at the upper end of the recovery pipe; the coring drill bit is installed at the lower end of the outer pipe; the inner pipe assembly comprises an inner pipe, a spear head, a spring, a spring seat, a spring rack, a hanging ring and a breaking device; the spear head is installed in the recovery pipe; the spring is installed on the spring seat and positioned in the spring chamber; the spring seat is installed at the upper end of the spring rack; the bottom of a reed seat is rotatably connected with multiple core protective plates; the multiple core protective plates comprise at least two layers, and the core protective plates at the lower layer are positioned between the adjacent core protective plates at the upper layer; and each core protective plate is eccentrically connected with the reed seat. The flammable ice sampling device disclosed by the invention can improve the tightness of a flammable ice sample, has the advantages of simple structure, strong effectiveness and low production cost and is convenient to use and popularize.

The invention relates to a dynamic seal device, which is installed between a rotating shaft and a box body, and is sleeved on the rotating shaft. The dynamic seal device comprises a ring-shaped base body, and a seal ring group which is located in the base body, wherein the seal ring group comprises an inner seal ring and an outer ring which are radially arranged along the rotating shaft. At least one slit is respectively opened on the inner seal ring and the outer seal ring, and the positions of the slits on the inner seal ring and the outer seal ring are mutually staggered. When the dynamic seal device with the structure is in working state, the axial motion and the radial motion can be kept, and the invention can freely float together with the rotating shaft. Therefore, the dynamic seal device of the invention has higher service life, and excellent seal property, which can meet the sealing needs of high temperature and high pressure.

The invention discloses an electronic expansion valve. The electronic expansion valve comprises a valve seat and a valve housing which are assembled to form a valve chamber; the electronic expansion valve also comprises a valve rod which is located in the valve chamber; the valve seat comprises an axial through hole and is provided with a valve opening; the valve rod is inserted into the axial through hole and can move along the axial direction to open or close the valve opening; one of the inner side wall of the axial through hole of the valve seat and the outer side wall of the valve rod is provided with an installing groove; a sealing ring is arranged in the installing groove. The electronic expansion valve is provided with the installing groove, the sealing ring is arranged in the installing groove, and accordingly the sealing performance between the valve seat and the valve rod can be good due to the sealing ring. Compared with a mode that sealing is performed through a bowl-shaped plastic piece in a background technology, two-way sealing can be achieved due to the sealing ring and the good sealing effect can be maintained regardless of the refrigerant flow.

The invention discloses an encapsulation type rechargeable lithium ion button battery, and is applied to the technical field of lithium ion batteries. The encapsulation type rechargeable lithium ion button battery comprises a sealing shell, electrolyte and an electrode. The electrolyte is arranged in the sealing shell, the electrode is arranged in the electrolyte and is a spirally wound electrode, and an insulating and ion-impermeable film (12) is arranged on the outermost ring of the spirally wound electrode. The encapsulation type rechargeable lithium ion button battery has the advantages of compact structure, stability in use and long service life.

The invention relates to a casting technique of a diesel engine oil sump. The casting technique of the diesel engine oil sump is characterized by comprising the following technique steps: a first step of installing a hot core mold of the oil sump on a horizontal core shooting machine, opening the mold, cleaning a mold cavity, spraying a release agent, assembling the mold, shooting sand, solidifying and opening the mold to take out of a sand core; a second step of deslagging of aluminum water, placing a lift tube into the aluminum water to be fixed in a sealed mode and placed below the mold, aligning the lift tube to a feed port of the mold, at the same time, flaming and heating of the mold and evenly spraying zinc oxide to a mold cavity of the mold; a third step of placing the sand core to a corresponding position in the mold and assembling the mold; a fourth step of heating the aluminum water to carrying out lift pouring to obtain a casting, cooling the casting in the mold cavity of the mold to be condensed and opening a box to take out the casting and a fifth step of removing the sand core in the casting, sawing to remove a pouring gate and a dead head, polishing the casting and carrying out shot blasting to obtain the diesel engine oil sump. The diesel engine oil sump is superior in appearance, good in sealing property, good in mechanical properties and durable, and leakage rate of the casting is reduced.

The invention discloses an underwater robot diving depth self-adjusting device, and relates to the technical field of buoyancy adjusting devices. The underwater robot diving depth self-adjusting device comprises a fixing plate; a sealing ring is fixed to the lower surface of the fixing plate; an adjusting cylinder is fixed to one side of the sealing ring; an adjusting hole is formed in the lower surface of the adjusting cylinder; a movable hole is formed in the upper surface of the fixing plate; a first rotating shaft is fixed in the movable hole; a threaded rod is fixed to the inner wall of the first rotating shaft; a clamping groove is fixed to one end of the threaded rod; a plurality of first clamping blocks are fixed to the surface of the clamping groove; a second rotating shaft is fixed to the other end of the threaded rod; an adjusting plate is fixed to an outer ring of the second rotating shaft; and a spring is fixed to one side of the adjusting plate. Through the action of thethreaded rod, the volume of liquid in the adjusting cylinder can be flexibly adjusted, and the underwater robot diving depth self-adjusting device floats or sinks under the action of buoyancy, so thatthe purpose of adjustment is achieved, the self-adjustment of the diving depth of the underwater robot is realized and the operation requirements of the underwater robot at different depths are better met.

The invention discloses a butterfly valve. The butterfly valve comprises a valve body with a hollow internal part, a valve shaft which vertically penetrates through the valve body and a valve plate which sleeves the valve shaft, wherein the valve plate is driven by the valve shaft to open or close the valve body; the inner side surface of the valve body is provided with a ceramic gasket which is arranged along the perimeter direction of the valve body; the periphery side of the valve plate is provided with a ceramic sealing plate which is arranged along the perimeter direction of the valve plate; a groove which is formed along the perimeter direction of the ceramic sealing plate is formed in the ceramic sealing plate; and a polytetrafluoroethylene gasket is arranged in the groove. The butterfly valve disclosed by the invention has a double-layer sealing effect, is high in corrosion resistance, has good application prospect and is worth promotion.

The invention discloses an automated biogas dry fermentation device, belonging to the field of energy saving and environmental protection, and consisting of an outer barrel composting trough 2 and an inner barrel anaerobic fermentation trough 4, and the required conditions of the reaction is controlled by a ventilation control system 3 of the outer barrel composting trough 2 as well as an automatic temperature control system 8 and a liquid flow mixing system 1 which control fermentation materials in the inner barrel anaerobic fermentation trough 4. The device is characterized in that the materials can be automatically discharged from the outer barrel composting trough 2 to be fed into the inner barrel anaerobic fermentation trough 4, and in order to ensure the leak tightness of the device, the invention provides three sealing modes of annular rubber pad type sealing, annular water ring type sealing and annular water seal. The device can reduce the possibility of leading oxygen into the device because of the misoperation of workers, and has good biogas quality and biogas generation rate.

The invention relates to a high-temperature resisting and high-pressure resisting injecting and extracting integrated double-layer hollow sucker rod. In order to overcome the defects that the gas-injecting and oil-extracting two sets of tubular columns are required by the present steam injection oil extracting technology and the sealing effect cannot meet the requirement of a steam injection operation, an upper joint, a rod body and a lower joint of the hollow rod provided by the invention are fixedly connected in turn from up to down; a central pipe is located in the hollow rod; a space between an outer pipe and an inner pipe of the central pipe is hollow and annular; a metal sealing ring I is mounted in an annular slot at an upper end of a connecting thread of the lower joint; a metal sealing gasket is mounted on an upper end face of the connecting thread of the lower joint; and a metal sealing ring II is mounted between a lower end part of the inner pipe of the central pipe and a lower fixing sleeve. The high-temperature resisting and high-pressure resisting injecting and extracting integrated double-layer hollow sucker rod has the beneficial effects that the structure is reasonable; the metal sealing rings are adopted, so that the hollow sucker rod has high-temperature and high-pressure resisting properties and can meet the requirement of the steam injection oil extracting technology; the steam injection and oil extraction producing operation is finished by the next tubular column; and the technical blank of a super heavy oil steam-injecting oil-extracting integrated tubular column is filled up.