53results about How to "Act as a seal" patented technology

The present invention provides a radial foil bearing having a sealing function, comprising a top end foil (3) which has a thickness t of more than or equal to 0.1.D0.33, and a plug (7) which is capable of preventing a bearing component from falling off and shielding a space of the gas as a lubricating oil to pass through raised foils (2), wherein t is the thickness (mm), D is a shaft diameter (mm). According to the radial foil bearing, the plug (7) which is capable of shielding the space between the raised foils (2) is arranged so that a slight gap is kept between a shaft (6) and the top end foil (3), and a high-performance sealing function with a least gap is provided.

The invention discloses a method and a device for sealing steel wire framework plastic composite pipe. The method comprises the following steps of: heating end opening of a composite pipe by a way of self plastic sealing of pipe material, and wrapping a steel wire with plastics turned out from inside and outside of the heated composite pipe by effect of external force. The device comprises a sealing rack and a mould disposed on the sealing rack for fixing the composite pipe; and a heating plate corresponding to the end opening of the composite pipe is disposed out of the mould. The plastics of the pipe material can be wrapped on the steel wire for sealing, and good promotional value is realized.

The invention discloses an adaptive speed bump for signal-controlled intersections, which comprises three parts: a speed bump body module, a control module and an energy recovery module. The speed bump part includes airfoil support plates, hydraulic cylinders, connecting rods, double-layer waterproof structures and protective boxes. Both the first airfoil support plate and the second airfoil support plate include a tooth end and a hinged end hinged to the box. The hinged ends are respectively hinged on the speed reduction belt box. The rod passes through the through hole, and the piston rod of the hydraulic cylinder is linked with the connecting rod, so that the first airfoil support plate and the second airfoil support plate are in a horizontal state or a raised state, which meets the requirements of the speed bump lifting state. The present invention judges the driving safety in real time according to the driving information of the vehicle and the signal phase of the intersection, and performs self-adaptive adjustment of the three states of the deceleration belt: hard rising, soft rising, and lowering, so that the driver can obtain correct decision-making information in time .

The invention discloses a low-voltage packaging process of a circuit board electronic component. The low-voltage packaging process comprises the following steps of: processing a circuit board needing to be packaged, realizing surface cleanness and providing surface energy; placing the processed circuit board in a mould, adding a packaging additive for pressurizing solidifying so as to realize packaging the electronic component on the circuit board; and taking the packaged electronic component on the circuit board. The low-voltage packaging process is high in packaging efficiency by adopting low-pressure injection molding packaging; the electronic component can not be damaged; the electronic component is complete in appeanrce during molding, and is easy to control; a part needing being packaged of the electronic component is completely packaged; and functions of sealing, moisture proofing, water proofing, dust proofing and chemical corrosion resistance are achieved for the molded part.

The invention discloses an intermittent feeding device for a rapeseed oil squeezer, and relates to the technical field of oil squeezing devices. The intermittent feeding device comprises a feeding barrel, a first limiting plate, a turning plate, a housing, a first connecting rod, a material carrying barrel, a sliding block, a first feeding port, the rapeseed oil squeezer, a bottom plate, a cam, afirst supporting frame, a first motor, a push plate, a second connecting rod, a second supporting frame, a spring, a second limiting plate, a first sliding rail, a second sliding rail and a filter sieve. The intermittent feeding device for the rapeseed oil squeezer is simple in structure and low in manufacturing cost, and the function of automatic intermittent feeding can be achieved; and the intermittent time of feeding can be adjusted by adjusting the rotating speed of the first motor and setting the parameters of the maximum stroke of the cam, so that the efficiency of squeezing the entering rapeseeds during rapeseed oil squeezing can be better improved, the oil yield can be improved, the content of rapeseed oil in oil cakes can be reduced, and the economic benefit can be improved.

The invention relates to a pneumatic abrasion-resisting angle stop valve which is small in size, light in weight, flexible to open, good in seal performance, resistant to abrasion and impact, easy to install, low in production cost and suitable for cutting off dust and ash dregs. The pneumatic abrasion-resisting angle stop valve comprises a valve body, a valve body sleeve, a valve base, a valve cover and a valve body neck bush, a valve rod, a valve clack sleeve and a valve clack are installed in the valve body, and a packing pad and a packing ring are arranged between the upper portion of the valve cover and the valve rod from bottom to top. The pneumatic abrasion-resisting angle stop valve is characterized in that a screw hole is formed in the valve cover, a round nut used for clamping a pneumatic device is installed at the upper end of the valve rod, the valve clack and the valve base are made of tungsten and cobalt hard alloy, the sealing face of the valve base and the valve clack is a conical face, the valve clack sleeve and the valve clack are connected through a spherical surface antifriction bearing, the lower end of the valve rod and the valve clack sleeve are connected in a conical face mode to achieve automatic centering, the lower end face of the valve rod is a spherical surface and makes contact with the upper end face of the valve clack for automatic center adjustment, and a lower end opening of a center through hole of the valve cover is a conical face to form an upper sealing point.

The invention discloses a medicine powder stirring machine with a canning and opening sealing device. The medicine powder stirring machine comprises a stirring machine body, a machine frame and the canning and opening sealing device, wherein the stirring machine body is fixed on the machine frame; the canning and opening sealing device is arranged among four support feet; the stirring machine body comprises a machine case, a driving device and a transfer device; the machine case comprises a stirring barrel and a stirring head; the stirring head is fixed on the stirring barrel; the stirring barrel is a cylinder with an annular vacancy groove formed in the upper end surface; the driving device comprises a driving motor, a center rotating shaft, a center gear, a rotary pushing unit, an ascending and descending stirring block and a rotary turning device; the driving device is arranged on the stirring head; the transfer device comprises a rotary protection cover and a rotary gear ring, and is pivoted on the stirring head. The medicine powder stirring machine has the advantages that through the dual stirring of the rotary stirring device and the rotary turning device, the fast and full stirring can be realized; the canning and opening sealing device can achieve medicine powder canning and opening sealing effects; the scattering and the contamination of medicine powder are avoided.

The invention relates to an optical fiber connector plug shell and an optical fiber connector plug. The optical fiber connector plug shell includes: a front shell in which a ferrule member is mounted;a rear sleeve connected to the rear end of the front shell to form an inner cavity, where the rear sleeve is provided with an optical cable penetrating channel, and an optical cable sheath fixing structure is further arranged in the rear sleeve; the optical cable sheath fixing structure comprises a crimping sleeve and a support sleeve, and the crimping sleeve can sleeve the outer side of the support sleeve so as to press the optical cable sheath on the support sleeve. According to the invention, the optical cable sheath sleeves the support sleeve from the rear and then is crimped by the crimping sleeve; in gluing, the inner side of the optical cable sheath is provided with a supporting sleeve supporting pad, so a glue solution is difficult to flow into the optical cable sheath, and the optical fiber can be returned in the optical cable sheath, such that the plug shell does not need to be provided with a remaining section for bending the optical fiber, thereby reducing the length of the whole plug shell, enabling the plug employing the plug shell to be installed at a position with a narrower space, and providing a wider application range.

A vertical electrical dust collector integrating gravity and cyclone dust removal is provided. Cyclones in the dust collector are arranged in a first-level gravity sedimentation chamber, and the central axis of each cyclone is in a vertical-state arrangement; a dust-containing gas inlet of each cyclone is located in the first-level gravity sedimentation chamber, and the center line of each dust-containing gas inlet is parallel to an upper tube sheet of the cyclones; the center line of a separated gas outlet of the upper end of each cyclone is coincident with the central axis of each cyclone; the separated gas outlet of the upper end of each cyclone and a dedusting port of the lower end of each cyclone are both communicated with a second-level gravity sedimentation chamber. By improving a structure of a gravity cyclone dust collector, the device described in the invention changes the structure of the cyclones and allows the dust-containing gas inlets of the cyclones to be parallel to the upper tube sheet of the cyclones, in the case, the center line and the central axis of the dust-containing gas inlet of each cyclone form an included angle which is an acute angle, a screw pitch of dust in the cyclones is small, the friction is mall, and the individual working efficiency of the mounted cyclones is improved with the connection way.

The invention discloses a probiotic composition as well as a preparation method and application thereof. The probiotic powder disclosed by the invention mainly comprises probiotics, prebiotics, dietary fibers, an embedding material, a protective agent and other auxiliary materials. All the components are synergistically compatible, so that the probiotic composition can keep high viable count for a long time, and the activity of the composition is kept. Furthermore, a probiotic product is prepared from four layers of packaging materials PET / NY / AL / CPP, so that the activity of the probiotics is kept stable. The preparation method of the probiotic product disclosed by the invention is an activity protection combination technology which is composed of a stable material mixing technology, a probiotic and prebiotic compounding technology, a moisture control technology, a microcapsule embedding technology, a packaging material control technology and other combination technologies. The activity of the probiotic powder can be ensured by controlling the adding sequence of the raw materials, process parameters and the like. Under the condition, the aging of viable bacteria is delayed, and the stability of the probiotic powder in the shelf life can be improved.

The invention relates to a moisture energy hot pump unit and a system thereof. The system comprises two large parts, wherein a front half part is a high-efficient hot pump host, a rear half part is ahot source tower adaptive to a low-temperature hot source hot pump host, parts forming the low-temperature hot source hot pump host comprise a dual-compressor structure, a combined dried evaporator, acombined segmented condenser, an air supplement and enthalpy addition device, an oil-gas separator, a siphon tank, a refrigeration oil cooling device, an expansion throttling device, a refrigerant inlet angle valve and a refrigerant outlet angle valve, the dual-compressor structure is formed from a variable-frequency compressor and a fixed-frequency compressor, the above main members form the low-temperature hot source host, all parts are combined to form optimal prevention liquid to run efficiently, low ambient temperature heat is absorbed by employing an anti-freezing liquid, a concentration device running efficiently and at a low cost is matched and is a condensation ejector, so that high-efficiency refrigerating under an extremely low-temperature environment is adapted, the system isapplied to a north place at high latitude for warming, traditional boiler for warming can be substituted, and the system is clean, energy-saving and environmental-friendly equipment.

The invention discloses a hardware machining stamping device with a protection mechanism and a method of the hardware machining stamping device. The device comprises a fixing base, wherein a fixing baffle is installed on the edge of the top end of the fixing base, a telescopic rod is installed in the middle of the bottom end of the fixing baffle, and an installation mechanism is arranged at the bottom end of the telescopic rod. The installation mechanism comprises a fixing block, a T-shaped sliding groove, a T-shaped sliding block, an upper stamping plate, fixing bolts, a fixing seat, positioning grooves, positioning blocks, positioning plates, positioning bolts, a containing box and a lower stamping plate. Through the installation mechanism, the upper stamping plate and the lower stampingplate can be conveniently installed by workers, thus, the upper stamping plate and the lower stamping plate can be conveniently detached by the workers, then the difficulty of replacing the upper stamping plate and the lower stamping plate of different specifications by the workers is lowered, meanwhile, the replaced upper stamping plate and lower stamping plate can be conveniently placed by theworkers, and therefore the upper stamping plate and the lower stamping plate are prevented from being placed around.

A gas box-type bag-type dust collector integrating high-efficiency cyclone dust removal is provided. Cyclones in the dust collector are arranged in a first-level gravity sedimentation chamber, and the central axis of each cyclone is in a vertical-state arrangement; a dust-containing gas inlet of each cyclone is located in the first-level gravity sedimentation chamber, and the center line of each dust-containing gas inlet is parallel to an upper tube sheet of the cyclones; the center line of a separated gas outlet of the upper end of each cyclone is coincident with the central axis of each cyclone; the separated gas outlet of the upper end of each cyclone and a dedusting port of the lower end of each cyclone are both communicated with a second-level gravity sedimentation chamber. By improving a structure of a gravity cyclone dust collector, the device described in the invention changes the structure of the cyclones and allows the dust-containing gas inlets of the cyclones to be parallel to the upper tube sheet of the cyclones, in the case, the center line and the central axis of the dust-containing gas inlet of each cyclone form an included angle which is an acute angle, a screw pitch of dust in the cyclones is small, the friction is mall, and the individual working efficiency of the mounted cyclones is improved with the connection way.

The invention provides a compressor and a wiring mechanism thereof. The wiring mechanism comprises a shell, at least one pin and an adhesive part; the shell comprises a body, at least one through hole is arranged on the body, and a convex part is arranged on the body and is positioned at the edge of the through hole; at least one pin penetrates through the through hole; and the adhesive part is located between the pin and the body of the shell and fills the through hole. According to the compressor and the wiring mechanism thereof, the defect rate caused by glass breakage of the wiring mechanism can be reduced, the reliability of the compressor is improved, and the internal space of the compressor is saved.

The invention discloses a self-positioning clamping type packaging box which comprises a box body and a box cover, wherein the box cover is arranged on the upper side of the box body in a buckled mode, the centers of the inner walls of the box body and the box cover are composed of anti-collision assemblies. Each anti-collision assembly comprises an outer-layer box board, an inner-layer box board,circular rings and supports, wherein the supports are fixedly connected with the inner walls of the outer-layer box board and the inner-layer box board, and the outer sides of the inner and outer circular rings are fixedly connected with the inner-layer box board and the outer-layer box board correspondingly. The composite type anti-collision packaging box for transportation is scientific and reasonable in structure and safe and convenient to use; the box body, the outer-layer box boards, the inner-layer box boards, first supporting boards, second supporting boards, the supports and the circular rings are arranged and cooperate with one another, so that the stability of a plurality of triangles formed by the supports, the outer-layer box boards and the inner-layer box boards and the anti-pressure capacity of the cambered surfaces between the supports and the circular rings both greatly enhance the anti-pressure and anti-impact capacity between the outer-layer box boards and the inner-layer box boards, and then the packaging box has enough anti-impact capacity to prevent the deformation problem when being impacted.

The invention provides a flexible display screen. The flexible display screen comprises a flexible thin film circuit board, a plurality of LED lamps fixedly mounted at the top of the flexible thin film circuit board and a plurality of wires arranged at the top of the flexible thin film circuit board and connected with the corresponding LED lamps. The flexible display screen has the advantages of being convenient to prepare, wide in application field, relatively low in cost and relatively good in ductility.

The invention relates to water steam energy heat pump equipment and a machine unit system thereof, in particular to a water steam energy heat pump machine unit. The machine unit comprises a dual-parallel compressor consisting of a variable-frequency compressor and a constant-frequency compressor, a combined dry type evaporator, a combined sectioned condenser, a gas supplementation enthalpy increasing device, an oil gas separator, a siphon tank, a cooling oil cooling device, an expansion throttle device, a refrigerating agent inlet angle valve and a refrigerating agent outlet angle valve; majorcomponents form a low-temperature heat source host; all of the components are combined to form the best combination to prevent liquid impact and to realize the efficient operation; the refrigeratingliquid is used for cooling refrigerating oil; the refrigerating oil can be better controlled in the proper temperature range; a better effect of lubricating the compression machine is reached, so thatthe adaptation to the efficient heat generation at the ultra-low temperature environment can be realized; the equipment is applied to heating in northern high latitude areas, can replace the existingboiler for heating, and belongs to very clean energy-saving environmental-friendly equipment.

The invention relates to the technical field of battery production, in particular to a vacuumizing and liquid injection device. The vacuumizing and liquid injection device comprises a clamping mechanism used for clamping a battery main body, a bag opening mechanism used for opening a bag opening of a battery gas bag, a vacuumizing and liquid injection mechanism used for performing vacuumizing andliquid injection on the battery gas bag, a lifting driving mechanism used for driving the output end of the vacuumizing and liquid injection mechanism to be inserted into or moved out of the bag opening of the battery air bag, an opening closing and sealing mechanism used for tightening the bag opening of the battery gas bag for sealing the gap between the battery gas bag and the output end of thevacuumizing and liquid injection mechanism, a clamping and sealing mechanism used for clamping the bag opening of the battery gas bag after being subjected to vacuumizing and liquid injection, and asealing mechanism used for sealing the battery gas bag after clamping the bag opening. The vacuumizing and liquid injection device is stable in working and high in efficiency, and the vacuumizing andliquid injecting mechanism directly performs vacuum pumping and liquid injection on the battery gas bag, so that the efficiency of vacuumizing and liquid injection is improved, the production period is shortened, and the quality of battery production is also improved.

The invention discloses industrial solid waste treatment equipment. The industrial solid waste treatment equipment comprises a box body, wherein the top part of the box body is provided with a material inlet; the top part of the right side of the box body is fixedly connected with a first positioning box; the bottom part of the right side of the box body is communicated with a water drainage pipe;an inner cavity of the box body is fixedly connected with a perforated plate; the back side and the front side of the top part of the left side of the inner cavity of the box body are respectively movably connected with a first rotary rod and a second rotary rod. The industrial solid waste treatment equipment has the advantage that by cooperatively using the box body, the material inlet, the first positioning box, the water drainage pipe, the first rotary rod, the second rotary rod, a crushing roll, a first gear, a second gear, a motor, a water tank, a water intake pipe, a water outlet pipe,a first water pipe, a water pump, a separating plate, a second water pipe, a spray head, the perforated plate, a box door, a first handle, a positioning casing, a filtering plate, a pull plate, a second handle, a sterilizing lamp, a protective box and a second positioning box, the problem of no automatic cleaning of the existing industrial solid waste treatment equipment is solved.

The invention discloses a mute dustproof sealed chain which comprises an inner chain board, an outer chain board, a sleeve, pin shafts and rollers. The inner chain board is provided with covering layers which at least cover chain board bodies and are softer than the inner chain board body; preferably, the whole outer surfaces of the chain board bodies are covered with the covering layers, and thethicknesses of the positions, located on the side faces of the chain board bodies, of the covering layers are 0.50-1.50 mm; the thicknesses of the positions, located on the edge faces of the chain board bodies, of the covering layers are 0.10-0.30 mm; and the covering layers are composed of vulcanized rubber layers, plastic layers, reinforced plastic layers or nylon layers. The mute dustproof sealed chain has the beneficial effects that the low-hardness covering layers are formed on the two sides of the inner chain board, the sealing piece effect is achieved, the vibration-absorbing and noise-reducing effects are further achieved, and the structure of the sealed chain is simplified; the service life of the mute dustproof sealed chain is long, noise is small, and the manufacturing and use cost is low; and compared with a sealed chain adopting an O-shaped sealing ring, the assembly efficiency can be improved by 50% or over, the service life can be prolonged by about 15%, the noise can bereduced by 3-5 decibels, and the comprehensive production cost can be reduced by about 10%.

The invention relates to a rubber sealing gasket for assembling of mill liners and an installation method thereof. The rubber sealing gasket for assembling of mill liners is a hollow cylindrical rubber sealing gasket having both hollow thick ends and a hollow thin middle part. Sections of the both hollow thick ends are triangular. The hollow both thick ends are combined by the hollow thin middle part which is cylindrical. The hollow both thick ends and a cavity of the hollow thin middle part which is cylindrical form a common smooth inner cylindrical surface so that the insertion of bolts is convenient. The installation method of the rubber sealing gasket for assembling of mill liners comprises the following steps of 1, lifting and carrying mill liners to preset installation positions in a mill cylinder one by one, 2, aligning bolt installation holes of the mill liners and bolt installation holes of the preset installation positions of the mill cylinder, 3, installing the hollow cylindrical rubber sealing gaskets which are soft into the bolt installation holes which belong to the mill liners and the preset installation positions of the mill cylinder and are aligned, 4, inserting bolts into the bolt installation holes from the mill liners, and 5, installing nuts on parts which belong to the bolts and stretch out from the bolt installation holes and tightening the nuts, wherein the heads of the bolts and nut gaskets respectively press the both hollow thick ends of the hollow cylindrical rubber sealing gasket. The rubber sealing gasket for assembling of mill liners can produce effects of sealing, buffering and protection in assembling of mill liners in a mill cylinder.

The invention discloses a self-adaptive deceleration strip used for a signal-control intersection. The self-adaptive deceleration strip comprises a deceleration strip body module, a control module and an energy recovery module. The deceleration strip body module comprises wing type supporting plates, a hydraulic cylinder, a connecting rod, a double-layer waterproof structure and a protected box. The first wing type supporting plate and the second wing type supporting plate each comprise a tooth end and a hinging end hinged to the box, each hinging end is hinged to the deceleration strip box, and the tooth ends are engaged and provided with through holes. The connecting rod penetrates through the through holes, and a piston rod of the hydraulic cylinder is linked with the connecting rod, so that the first wing type supporting plate and the second wing type supporting plate are in a horizontal state or a protruding state to meet the requirements for the rise-fall states of the deceleration strip. Driving safety is judged in real time according to driving information of vehicles and signal phases of the intersection, and self-adaptive adjustment of three states including hard-state rising, soft-state rising and falling of the deceleration strip is conducted, so that a driver obtains correct decision information in time.

The invention provides a non-contact tool setting gauge and relates to the field of tool measurement devices, in particular to the automatic improvement on tool gauges in numerically-controlled machine tools. The on-contact tool setting gauge is ingenious in structure, good in use effect, long in service life and excellent in stability. The tool setting gauge further comprises a pair of high-strength lenses and a pair of installation blocks, each high-strength lens is fixedly connected to the position, facing the center of a base body, of an orifice of a containing hole, and each installationblock is fixedly connected to the position, away from the center of the corresponding base body, of the orifice of the corresponding containing hole. Sealing connection is kept between the high-strength lenses and the containing holes, and sealing connection is kept between the installation blocks and the containing holes. A first sinking table is arranged at the position, facing the center of thecorresponding base body, of the orifice of each containing hole, and each high-strength lens is fixedly connected with the inside of the corresponding first sinking table; a second sinking table is arranged at the position, away from the center of the corresponding base body, of the orifice of each containing hole, and each installation block is detachably connected with the inside of the corresponding second sinking table. The non-contact tool setting gauge has the advantages of being ingenious in structure, good in use effect, long in service life and excellent in stability.

The invention relates to the field of powder metallurgy brake pad triangular support surface treatment, in particular to a molybdenum disulfide coating and a preparation method and application thereof. The molybdenum disulfide coating provided by the invention is prepared from the following raw materials in parts by weight: 95 to 105 parts of molybdenum disulfide, 2 to 5 parts of phenolic resin and 0.8 to 1.1 parts of a solid lubricant. According to the molybdenum disulfide coating provided by the invention, the molybdenum disulfide, the phenolic resin and the solid lubricant in specific partsby weight are matched with one another and are applied to a triangular support surface treatment process, so that the compactness of a coating layer of the coating and the bonding performance of thecoating layer and a triangular support can be effectively improved.

The invention relates to an optical fiber connector plug shell and an optical fiber connector plug. The fiber optic connector plug housing includes: a front housing, in which ferrule components are installed; a rear sleeve, which is connected to the rear end of the front housing and encloses an inner cavity with the front housing, and the rear sleeve has an optical cable passage, and the rear sleeve An optical cable sheath fixing structure is also provided in the sleeve; the optical cable sheath fixing structure includes a crimping sleeve and a supporting sleeve, and the crimping sleeve can be placed outside the supporting sleeve to press the optical cable sheath on the supporting sleeve. In the present invention, the sheath of the optical cable is sleeved on the supporting sleeve from the rear and then crimped through the crimping sleeve. When applying glue, since the inner side of the sheath of the optical cable has a support pad, the glue is difficult to flow into the inner sheath of the optical cable, and the optical fiber can be The retraction is carried out in the outer sheath of the optical cable, so the plug housing does not need to be provided with a remaining section for the bending of the optical fiber, thereby reducing the length of the entire plug housing, so that the plug using this plug housing can be installed in a place where the space is relatively narrow , with a wider scope of application.

The invention provides delay flushing valve with a gear function. The delay flushing valve comprises a button, a valve rod, a valve body, a clamp spring, a valve element seat, a bottom sleeve and a support. The flushing valve supplies water from one end of the valve body to the edges of the valve element seat, the bottom sleeve and the support; when the button is manually pressed down, the clamp spring pushes the valve rod to move downwards, and a valve element seat assembly moves and slides downwards so as to reduce stored water in a cavity; when the button is released by hand, under the elastic force effect of the clamp spring, the button and the valve rod rise again to pull the valve element seat to move upwards; when a sanitary appliance needs to be used, the button is pressed down forwater taking and rises again after the set delay time, and the button is fixed to the head of the valve rod; and the flushing valve delay time required by the delay flushing valve is achieved throughthe amount of the water flowing into a bottom sleeve cavity from micro needle holes and the used time of the water for flowing into the bottom sleeve cavity from the micro needle holes.

The invention discloses a special joint with a sealing and connecting structure, and relates to the technical field of thermal fluid and petroleum collecting and conveying equipment. The special jointis provided with a joint main body arranged at the lower end of a pipeline, an inner mounting part, a sealing surface and an outer mounting part, wherein the inner mounting part, the sealing surfaceand the outer mounting part are arranged on the joint main body; and the inner mounting part is provided with an inner thread used for being directly connected with the lower end of the pipeline, andthe outer mounting part is provided with an outer thread for being coupled with the pipeline. The special joint with the sealing and connecting structure can be used for solving the problems of sealing and connection when an internal thermal insulation pipe is used in the thermal fluid collection process, so that the dimensional accuracy, roughness and the like of the joint main body are easy to control, the joint main body is very convenient to replace and repair even if problems exist, and an oil pipe and a core pipe can still be well connected and sealed under the conditions of length change caused by thermal expansion and cold contraction and angular displacement possibly generated between an upper coupling and a lower coupling when the oil pipe is subjected to fastening operation in scenes such as an oil field site.