1187results about "Pipe-joints" patented technology

The utility model discloses a corrosion-resistant metal lining socket type multilayer pipe, which belongs to the technical field of pipes and comprises an inner pipe, a middle layer and an outer pipe which are sequentially sleeved from inside to outside, steps and / or grooves are arranged on the inner wall of a socket end, and the inner pipe, the middle layer and the outer pipe are adhered to form the pipe or compressed to form the pipe. The outer pipe comprises a socket end, a pipe body and a spigot end which are connected in sequence, the outer pipe is made of metal, the inner pipe is made of a corrosion-resistant material, each end of the pipe is provided with a sealing layer and a lining ring made of a corrosion-resistant metal material, and the length of each lining ring extending into the pipe is not less than 20mm. The anti-corrosion pipeline is good in anti-corrosion effect, and the water conveying efficiency of the pipeline is improved. The corrosion-resistant metal lining ring prevents each layer of material from being stripped; and the strength and the deformation resistance of the pipe are improved.

The invention discloses a spigot-and-socket type multi-layer pipe with edge-wrapped end faces and a manufacturing method thereof.The pipe comprises an inner pipe, a middle layer and an outer pipe, the middle layer is made of an insulating material, the inner pipe is made of a corrosion-resistant material, the outer pipe comprises a bell mouth, a pipe body and a spigot which are sequentially connected, one end of the inner pipe wraps the end face of the spigot, and the other end of the inner pipe wraps the end face of the pipe body; and the inner pipe, the middle layer and the outer pipe are compressed to form the pipe. The manufacturing method comprises the steps that the outer pipe is treated, and the inner pipe and the middle layer are manufactured; the inner pipe, the middle layer and the outer pipe are sequentially arranged from inside to outside; each layer is compressed; and covering edges are arranged. The corrosion-resistant inner pipe prevents the outer pipe from being rusted to pollute water quality, the thickness of the lining is small, the inner pipe and the outer pipe are completely separated by the middle layer, the covered edge and the inner sleeve are integrated, the inner sleeve is prevented from electrochemical corrosion and being washed away by water flow, the covered edge is free of steps, and water flow resistance of the steps is eradicated. And the minimum thickness of the composite socket and the minimum thickness of the single-layer socket can be obtained through theoretical calculation.

The utility model relates to the technical field of nodular cast iron pipes, in particular to a socket type pipeline connector which comprises a socket, a spigot and a sealing piece, the socket comprises an annular sealing groove, an annular limiting part and a deflection groove which are coaxial, the annular limiting part separates the annular sealing groove and a conical groove, an annular retaining groove is formed in the annular sealing groove, and the deflection groove is formed in the spigot. An annular containing groove is formed by the distance between the annular retaining groove and the annular limiting part. The maximum-diameter port of the conical groove is connected with the annular limiting part; the inner diameter of the annular limiting part is smaller than the maximum inner diameter of the conical groove; the sealing piece comprises a hard rubber ring and a soft rubber ring, the outer ring of the hard rubber ring is arranged in the annular retaining groove, the outer ring of the soft rubber ring is tightly attached to the annular containing groove, the inner diameter of the hard rubber ring and the inner diameter of the soft rubber ring are smaller than the inner diameter of the annular limiting part, and the outer wall of the inserting opening is attached to the inner ring of the soft rubber ring in a sealed mode. Under the condition that the insertion depth of an insertion opening of an existing socket and spigot type pipeline connector into a deflection groove is the same, the deflection angle of the insertion opening in the deflection groove can be effectively increased.

The invention discloses a nozzle flow meter convenient to assemble and adjust and an assembling and adjusting method thereof, and belongs to the technical field of flow meters, and the nozzle flow meter convenient to assemble and adjust comprises two connecting pipes, a pore plate assembly and a connecting mechanism. Annular grooves are formed in the opposite ends of the two connecting pipes. The pore plate assembly is located between the two connecting pipes. According to the connecting mechanism, the first fixing ring, the second fixing ring and the tensioning assembly are arranged, the distance between the two connecting pipes can be changed by adjusting the tensioning assembly, the pore plate assembly can be easily clamped between the two connecting pipes, the assembling efficiency is improved, and the operation difficulty is reduced; and the pore plate assembly is detachably connected with the connecting pipe, so that the pore plate assembly can be conveniently maintained, repaired or replaced in the later period.

The invention discloses a novel plug-in type glass fiber reinforced plastic air duct, and relates to the technical field of glass fiber reinforced plastic air ducts. The novel plug-in type glass fiber reinforced plastic air duct comprises a duct body, a plug-in section is arranged at the left end of the duct body in a sealing and sliding mode through a piston ring, a clamping ring is fixed to the left end of the plug-in section, and a check ring is fixed to the inner wall of the duct body; the sealing adjusting assembly is mounted on the inner wall of the socket section through two sliding grooves; and the auxiliary dismounting assembly is arranged between the mounting frame and the sealing adjusting assembly. The sealing ring tightly attached to the outer wall of the inserting section is arranged on the inner wall of the socket section, so that the sealing performance of the inserting structure is improved; the sealing adjusting assembly is arranged, the sealing ring is opened in the inserting process of the inserting section, and the friction resistance during inserting is reduced; by arranging the inserting section capable of being adjusted in a sliding mode and the auxiliary disassembling assembly, the inserting section can be slidably contained in the barrel body during disassembling, the two ends of the middle-section glass fiber reinforced plastic air barrel and the other glass fiber reinforced plastic air barrel are not partially overlapped, and therefore the middle-section glass fiber reinforced plastic air barrel can be rapidly separated from the air barrels at the two ends, and the maintenance and replacement efficiency is improved.

A connector assembly may include an elastomeric connector comprising an approximately perpendicular flange at a distal end thereof and an opening therethrough; and a rigid compression fitting having an opening aligned with the opening of the elastomeric connector. The connector assembly may be used with a converter hose. Related methods include attaching the converter hose to a shower head, faucet or spigot.

A threaded rod locking device can include a housing defining an internal bore and a plunger within the internal bore. The plunger can include a first plunger body having a first threaded section and a second plunger body having a second threaded section, the first and second plunger bodies being movably received within the internal bore. The rod locking device can further include a passage to axially receive and secure threaded rods within the housing, the passage defined by the first and second threaded sections, with an ovular cross-section when the plunger is in a closed configuration and a circular cross-section when the plunger is in an open configuration, and a biasing member arranged within the internal bore to provide a biasing force that urges the plunger into the closed configuration, the plunger being movable against the biasing force to transition from the closed configuration to the open configuration.

The invention discloses a socket and spigot type multi-layer pipe and a design method for the socket thickness and the spigot thickness of the socket and belongs to the technical field of pipe design, the pipe comprises an inner pipe, a middle layer and an outer pipe which are sequentially connected in a sleeved mode from inside to outside, the outer pipe is made of metal, the middle layer is made of nonmetal, the inner pipe is made of polyethylene, and the outer pipe is made of polyethylene. The outer pipe comprises a bellmouth, a pipe body and a spigot which are connected in sequence, each end of the pipe is provided with a bushing ring and a sealing gasket, the two bushing rings respectively wrap the two sealing gaskets, the bellmouth is a single-layer bellmouth, when the length of the bushing ring extending into the inner pipe is smaller than the length of the spigot, the spigot is a single-layer spigot, and otherwise, the spigot and the bushing ring matched with the spigot form a composite spigot. The inner layer and the outer layer are bonded into a whole through the hot melt adhesive, and the lining ring and the rubber sealing gasket prevent water pollution caused by corrosion and stripping of the inner wall of the metal outer pipe; the spigot and the bushing ring matched with the spigot form a composite spigot, and the minimum spigot thickness and the minimum bellmouth thickness of the multi-layer pipe can be obtained through theoretical analysis and calculation.

The invention discloses a multilayer composite pipe with edge-wrapped and sealed end faces and a manufacturing method thereof.The composite pipe comprises an inner pipe, a middle layer and an outer pipe, the middle layer is made of hot melt adhesive, the inner pipe is resistant to corrosion, the outer pipe comprises a bell mouth, a pipe body and a spigot which are connected in sequence, and the end face of the spigot and the end face of the pipe body are wrapped by two sealing gaskets respectively; one end of the inner pipe tightly presses the sealing gasket on the socket end face, and the other end tightly presses the sealing gasket on the pipe body end face to form full sealing. The manufacturing method comprises the steps that the outer pipe is treated, and the inner pipe and the middle layer are manufactured; the inner pipe, the middle layer and the outer pipe are arranged from inside to outside; each layer is compressed; performing compounding; and covering edges are arranged. The inner pipe and the outer pipe are separated by the middle layer, the bonding strength is high, the lining is prevented from being separated, the covered edge and the inner sleeve are integrally formed or welded, the inner sleeve is prevented from being washed away by water flow, the covered edge has no step, and the step water flow resistance is completely eradicated. And the minimum thickness of the composite socket and the minimum thickness of the single-layer socket of the socket pipe can be obtained through theoretical calculation.

The invention discloses a workshop air purification dehumidifier, and belongs to the technical field of dehumidification, the workshop air purification dehumidifier comprises a machine body, the machine body is provided with a through air cabinet pipe, the air cabinet pipe is internally provided with a ventilation pipe, one end of the air cabinet pipe is provided with a fan matched with the ventilation pipe, the other end of the air cabinet pipe is provided with an air inlet, and the air cabinet pipe is internally provided with a transition mechanism; and a pre-cleaning mechanism is arranged in the ventilation pipe. According to the device, through the passing groove defined by the air inlet and the adjusting blocks and the design of multiple sections of different diameters of the ventilation pipe, a section of Venturi pipeline with the inlet shrunk and then gradually enlarged is formed from the air inlet to the ventilation pipe, on the premise that the power of the fan is not increased, the air inlet flow is accelerated, kinetic energy is converted into negative pressure energy through the Bernoulli effect, and the energy efficiency is improved. The high-speed low-pressure area of the throat remarkably increases the suction force at the inlet of the air inlet, and the suction efficiency of heavy impurities such as water vapor suspended in a workshop is improved, so that the overall purification efficiency is improved.

A deformable adapter sleeve 44 adapts a standard manifold connector designed for non-corrugated tubing to enable connection of a length of corrugated tubing to a manifold. The corrugated tubing has at least one corrugation groove. The deformable adapter sleeve comprises a main body 46 with an axially-extending bore 48 allowing the length of corrugated tubing 40 to be received within the deformable adapter sleeve, and a protrusion 52. The protrusion extends in a radial direction for insertion into a corrugation groove such that the diameter of the bore varies axially. The main body includes a deformable material which enables further insertion of the main body into the corrugation groove or a second corrugation groove by deformation of the main body. The main body further comprises a further material distinct from the deformable material. The further material is provided as a layer radially outwardly of the deformable material. A method of adapting a standard manifold connector designed for non-corrugated tubing for enabling a length of corrugated tubing to be connected to a manifold is also provided.

The utility model relates to the technical field of groove pipe clamps, in particular to a groove variable-diameter pipe clamp which comprises a connecting assembly, the connecting assembly comprises two half cylinders which are symmetrically and detachably connected, the two half cylinders are symmetrically arranged between a first pipeline and a second pipeline, and fixing half rings are arranged at one ends of the interiors of the half cylinders. The first pipeline is provided with a first groove matched with the fixed semi-ring, the other ends of the interiors of the semi-cylinders are elastically connected with movable semi-rings, a sealing piece is arranged between the fixed semi-ring and the movable semi-ring in one semi-cylinder, the sealing piece comprises a fixing piece connected to the semi-cylinder, and the end, close to the second pipeline, of the fixing piece is connected with a limiting cylinder. The end, close to the second pipeline, outside the limiting barrel is in threaded connection with the second pipeline, and sealing gaskets are arranged at the end, close to the first pipeline, of the limiting barrel and the end, close to the second pipeline, of the limiting barrel. Therefore, on the premise that the tightness of connection of the two pipelines is guaranteed, the connection steps are simplified, the installation time is shortened, and the installation efficiency is improved.

The utility model belongs to the technical field of two-way pipes, in particular to a hot forging two-way pipe fitting, which comprises a two-way pipe main body, the bottom of the two-way pipe main body is communicated and fixed with a lower through pipe, and two ends of the two-way pipe main body and the bottom end of the lower through pipe are fixedly connected with first sealing rings. The movable ring is moved, the movable ring drives the connecting block to move through the flexible steel rope, the connecting block drives the clamping pin to slide on the fixing rod and compress the first spring, the mounting block on the second sealing ring is inserted into the cavity, and when one side of the first sealing ring makes contact with one side of the second sealing ring, force applied to the movable ring is released at the moment; when the pipeline is connected with the two-way pipe fitting, the first spring in a compressed state resets, the first spring drives the corresponding clamping pin to be clamped with the clamping groove, and therefore the pipeline and the two-way pipe fitting are connected, the moving ring is moved during disassembly and assembly, operation is simple and convenient in the disassembly and assembly process, and meanwhile through the arrangement of the first sealing ring and the second sealing ring, the sealing effect is good. And the stability and the sealing performance after connection are improved.

The disclosure relates to adapters, systems, and methods to connect a metal component and a ceramic component. The systems and methods generally include a metal header, a header seal and a zirconia toughened alumina (ZTA) header.

The utility model discloses a pipe connecting device which comprises a first connector and a second connector, and the second connector is coaxially connected with the first connector in an inserted mode. The first connector and the second connector are each provided with an inserting pipe used for being connected with an external pipeline. A hot melting assembly is arranged on each inserting pipe, and meanwhile a sealing assembly and a hot melting assembly are further arranged in a connecting area of the first connector and the second connector; compared with the prior art, the quick hot melting connection of the inserting area can be achieved through the hot melting assembly, and the connection efficiency of the pipeline can be improved; meanwhile, compared with a traditional gluing mode, melting and mixing of materials of the pipeline and the connecting device are achieved through hot melting connection, the connecting strength between the connecting device and the external pipeline is improved as much as possible, and water seepage of the connector is prevented advantageously; and meanwhile, the end of the external pipeline is separated from water flow in an inner inserting connection mode, the isolation and protection effect on the end area is further improved, and water seepage is avoided.

The fluidic device (1) comprises a tubular end portion (9) of a first pipe (7), this portion (9) being essentially made from synthetic material and having at least one electrically conductive inner surface (25), as well as an outer surface (27), a connector (17), suitable for a second pipe (11), the connector (17) comprising an electrically conductive tubular insert (19), received in the end portion (9) of the first pipe (7) and in contact with at least part of the inner surface (25) thereof.

The invention relates to a press-fit joint. The press fitting may include a connector body and a press sleeve. The connector body includes a connection section and a retention section. The connection section is configured to receive a catheter. A press-fit sleeve may be crimped over the conduit and the connection section.

Air guidance system for a vehicle, comprising at least two air guidance channels (1, 2) produced by a blow molding process or a 2-plate thermoforming process, wherein the air ducts (1, 2) overlap in a common connection area (3) such that a first connection section (4) of the first air duct (1) is enclosed by a second connection section (5) of the second air duct (2) and, wherein the connecting sections (4, 5) have corresponding polygonal cross-sections, and wherein the connecting sections (4, 5) are detachably connected to each other via at least one locking connection (6) provided in the connecting area (3), wherein the locking connection (6) is formed from a locking element (7) formed in the first connection section (4) and a counter-locking element (8) formed in the second connection section (5), wherein the connecting sections (4, 5) have corresponding polygonal cross-sections with at least two corners (9a, 9b, 10a, 10b, 11a, 11b, 12a, 12b), wherein the locking element (7) and the counter-locking element (8) are each arranged on at least one of the respective adjacent corners (9a, 9b, 10a, 10b) of the connecting sections (4, 5), characterized by the fact that in the common connection area (3) at least one additional stop system (13) is provided, consisting of a stop element (14) formed in the first connection section (4) and a counter-stop element (15) formed in the second connection section (5), wherein the stop element (14) and the counter-stop element (15) are also arranged on at least one of the respective adjacent corners (11a, 11b, 12a, 12b) of the connecting sections (4, 5), wherein the locking connection (6) and the stop system (13) are coordinated such that, after the locking connection (6) has engaged, the stop element (14) and the counter-stop element (15) define a final position of the locking connection (6) in order to prevent the locking connection (6) from over-engaging.

The invention discloses a sealing element for a valve, and relates to the field of sealing elements, the sealing element comprises a valve sealing gasket and two valve pipelines, the valve sealing gasket is located between the two valve pipelines, a plurality of fastening bolts are inserted between the two valve pipelines, and fastening nuts are installed on the fastening bolts in a threaded mode. It needs to be explained that the valve sealing gasket can be effectively prevented from being damaged by rainwater, sand and sand through protection of the sealing gasket protection cover, meanwhile, the multiple blowing blades are blown by external natural wind to rotate, the lubricating box rotates on the outer surface of the valve sealing gasket, and therefore the valve sealing gasket is prevented from being damaged. Furthermore, the valve sealing gasket is coated with the lubricating liquid through the lubricating sponge by the lubricating box, so that the valve sealing gasket is automatically lubricated, and the service life and the sealing effect of the valve sealing gasket are guaranteed; in addition, after the sealing gasket protection cover is installed, a plurality of limiting racks are clamped on a plurality of locking gears, and the problem that a fastening bolt or a fastening nut is loosened can be effectively avoided.

The utility model relates to the technical field of all-air air-conditioning systems, in particular to a novel all-air air-conditioning transmission and distribution pipeline system which comprises a variable-diameter pipeline joint connected with an air outlet of a unit, one end of the variable-diameter pipeline joint is connected with a first rectangular straight pipe, one end of the first rectangular straight pipe is connected with a transition assembly used for penetrating through a wall or a lintel, and the other end of the first rectangular straight pipe is connected with a second rectangular straight pipe. The transition assembly is connected to one end of a second rectangular straight pipe, the other end of the second rectangular straight pipe is connected with one end of a third rectangular straight pipe through a rectangular straight joint, and the other end of the third rectangular straight pipe is connected with a rectangular elbow. According to the novel all-air air conditioner transmission and distribution pipeline system, the purpose of reducing the pipe diameter can be achieved through connection among the square-to-round straight joint, the round straight pipe and the round-to-square elbow, damage of system construction to a building main body structure is reduced, construction accidents are avoided, and the construction efficiency is improved. And it can be guaranteed that air passing through the pipeline can carry enough cold and heat quantity and fresh air demand quantity, and it can be guaranteed that the cold and heat quantity value conveyed to each room is balanced.

Deformable Adapter Sleeve, Kit Comprising the Same, and Method of Use Thereof A deformable adapter sleeve (44;144) is provided for adapting a standard manifold connector (14) designed for non-corrugated tubing (12) to enable connection of a length of corrugated tubing (40) to a manifold (10). The length of corrugated tubing (40) has at least one corrugation groove. The deformable adapter sleeve (44;144) has a main body (46;146). The main body (46;146) has an axially-extending bore (48;148) and a protrusion (52). The axially-extending bore (48;148) enables the length of corrugated tubing (40) to be received within the deformable adapter sleeve (44). The protrusion (52) extends at least partially in a radial direction for insertion into the or a first corrugation groove such that the diameter of the bore (48;148) varies axially. The main body (46;146) includes a deformable material which enables further insertion of at least part of the main body (46;146) into the first corrugation groove or a second corrugation groove by deformation of the main body (46;146). The main body (46;146) further comprises a further material distinct from the deformable material. The further material is provided as a layer radially outwardly of the deformable material.

The utility model relates to the technical field of natural gas pipelines, in particular to a natural gas pipeline connecting device which comprises a pipeline body, a clamping groove is formed in the pipeline body, two rotating shafts are rotationally connected into the pipeline body, connecting rods are connected to the outer surfaces of the two rotating shafts in a sleeved mode, and clamping blocks are fixedly connected to the opposite ends of the two connecting rods. The two clamping blocks are matched with the clamping groove, the spring is connected to the outer surface of the pipeline body in a sleeving mode, the sleeve is connected to the outer surface of the spring in a sleeving mode, and the sleeve is slidably connected to the outer surface of the pipeline body. The sleeve is driven to slide and reset through the acting force of the spring, the sliding base is pushed to the initial position through sliding of the sleeve, the pipeline body can be mounted and dismounted only by sliding the sleeve in the operation process, dismounting work does not need to be carried out with the help of extra tools, operation is easy and convenient, and practicability of the device is improved.

The utility model discloses an assembly type low-specific-friction low-air-leakage ventilation pipeline, and relates to the technical field of ventilation air pipes. The utility model comprises pipe joints which are spliced end to end; the pipe joint comprises an outer shell and an inner shell which are coaxially arranged in a sleeved mode, and the inner wall of the outer shell is attached to the outer wall of the inner shell. A first annular groove surrounding the axis of the outer shell is formed in the middle section of the inner wall of the outer shell, second annular grooves surrounding the axis of the outer shell are formed in the two ends of the inner wall of the outer shell, and one side of each second annular groove penetrates through the end of the outer shell. A cooling filling cavity is formed between the outer wall of the inner shell and the first annular groove in a surrounding mode, the outer wall of the inner shell and the two second annular grooves form a first sealing filling cavity and a second sealing filling cavity respectively, and the first sealing filling cavity and the second sealing filling cavity of the other pipe joint are spliced to form a sealing cavity. The purposes that the air pipe can be conveniently assembled, the sealing performance is excellent, and meanwhile the air pipe has low specific friction resistance and good flame retardant performance are achieved.

The utility model provides a quick connector of a fuel gas corrugated pipe, and belongs to the technical field of fuel gas pipelines. The problem that potential safety hazards exist when an existing quick connector is used is solved. The quick connector of the fuel gas corrugated pipe comprises a locking nut, a connector body, a sealing gasket and a clamping piece, the sealing gasket is arranged at the end, facing the locking nut, of the connector body, the inner side of the locking nut is provided with an annular protruding shoulder, the clamping piece is arranged between the sealing gasket and the protruding shoulder, and the inner side of the clamping piece is provided with a clamping part protruding inwards. The quick connector of the fuel gas corrugated pipe further comprises an annular insulating ring made of insulating materials, the insulating ring is arranged on the outer side of the clamping piece in a sleeving mode, the outer side face of the insulating ring can abut against the inner wall of the locking nut, and the end, facing the protruding shoulder, of the insulating ring is provided with an annular blocking edge protruding inwards. And the blocking edge is positioned between the clamping piece and the convex shoulder. The quick connector of the fuel gas corrugated pipe can effectively avoid potential safety hazards.

The invention relates to the technical field of mechanism design, and discloses a case of a server, a liquid cooling system and a cabinet. The case of the server comprises a case body, a cover plate is arranged on one side of the case body and comprises a cover plate main body and a sub-cover body, a notch is formed in the side, close to a rear window of the case body, of the cover plate main body, the sub-cover body is detachably arranged at the notch, and the distance between the sub-cover body and a first wall of the case body is larger than the distance between the cover plate main body and the first wall. The first wall is opposite to the cover plate; and the liquid cooling blind plug is arranged at the rear window of the box body, is positioned between the sub-cover body and the first wall, and can float along the radial direction and / or the axial direction of the liquid cooling blind plug. According to the case provided by the embodiment of the invention, the risk that the liquid cooling blind-plug connector collides with the cover plate of the case body in the floating process can be reduced, the floating range of the liquid cooling blind-plug connector is enlarged, the connection between the liquid cooling blind-plug connector and the fluid connector on the cabinet is more reliable, and the structural strength of the rear window of the case body and the cover plate main body can be improved.

The invention belongs to the technical field of ceramic connection, and discloses a silicon carbide pipe sealing connecting piece for laser-assisted high-entropy glass connection and a preparation method and application thereof. According to the method, silicon oxide, aluminum oxide, titanium oxide, iron oxide and rare earth oxide which are equal in mole are subjected to planetary ball milling, rotary evaporation, drying and sieving to prepare solder powder. And slurry obtained by mixing an isobutylene maleic anhydride polymer 104 aqueous solution and solder powder is added from the other end assembled by the silicon carbide cladding tube and the end plug, and a to-be-connected piece is obtained. And placing the to-be-connected piece in laser equipment, heating the connection part through laser in different atmospheres until the connection part is molten, and rapidly cooling to obtain the high-entropy glass connected silicon carbide pipe sealing connection piece. The connecting layer of the connecting piece is compact, the connecting piece is tightly combined with the silicon carbide cladding pipe and the end plug of the silicon carbide cladding pipe, the connecting piece has good corrosion resistance and sealing performance, high mechanical strength is kept at 800 DEG C, and the connecting piece can be applied to the field of silicon carbide ceramic cladding end plug sealing.

The utility model provides a steel pipe and PCCP pipe connecting piece which comprises a bell mouth connecting piece and a spigot connecting piece, the bell mouth connecting piece comprises a first flange plate, a bell mouth connecting pipe is fixed on one side of the first flange plate, a first connecting pipe is fixed on the other side of the first flange plate, and the spigot connecting piece comprises a second flange plate. A spigot connecting pipe is fixed to one side of the second flange plate, a second connecting pipe is fixed to the other side of the second flange plate, the socket connecting pipe is used for being connected with a spigot steel ring of the PCCP in a sleeved mode, the spigot connecting pipe is used for being inserted into a socket steel ring of the PCCP, and the first connecting pipe and the second connecting pipe are used for being connected with steel pipes in a sleeved mode respectively. The steel pipe is connected with the socket and the spigot of the PCCP through the prefabricated socket connecting piece and the prefabricated spigot connecting piece, the structure of the steel pipe does not need to be changed, the steel pipe does not deform, the stability and durability of the connecting position of the steel pipe and the PCCP are guaranteed, construction is convenient, and the engineering investment cost is low.

The invention relates to the technical field of pressure testing devices.The embodiment of the invention provides a pressure testing device and method.The pressure testing device of the pressure container comprises a connecting cylinder, a moving plate, a pushing assembly, a supporting assembly and a plugging assembly, and the connecting cylinder is welded and fixedly installed at a pressure testing opening of the pressure container; the moving plate is slidably installed in a sliding groove of the pressure test plate, the pushing assembly is arranged on the side face of the pressure test plate, a pressure test assembly is arranged on the pushing assembly through the moving plate, the pushing assembly is used for pushing the pressure test assembly into a pressure container, the supporting assembly is arranged on the pushing assembly, and the plugging assembly is arranged on the supporting assembly and used for plugging a gap. According to the technical scheme, the technical problem that in the prior art, when over-pressure testing is carried out on the pressure vessel and the connecting pipe is installed on the pressure vessel, a plurality of bolts need to be installed when flange connection is carried out, and consequently the process is tedious is solved.

The utility model discloses a combined PVC pipe with different pipe diameters, which comprises a large-diameter PVC pipe body and a small-diameter PVC pipe body, the outer side wall of the large-diameter PVC pipe body and the outer side wall of the small-diameter PVC pipe body are respectively provided with a plurality of first clamping blocks and second clamping blocks at equal intervals, and the inner wall and the outer wall of one end of the large-diameter PVC pipe body are respectively provided with a first inner connecting ring and a first outer connecting ring. The surface of the first outer connecting ring is provided with a first L-shaped clamping groove connected with a first clamping block in a limiting and clamping mode, the inner wall and the outer wall of one end of the small-diameter PVC pipe body are provided with a second inner connecting ring and a second outer connecting ring respectively, and the surface of the second outer connecting ring is provided with a second L-shaped clamping groove connected with a second clamping block in a limiting and clamping mode. When the structure is used, connection between the large-diameter PVC pipe body and the small-diameter PVC pipe body can be completed only by rotating the first outer connecting ring and the second outer connecting ring which are fixedly connected together through the first bottom ring and the second bottom ring, connection and installation are rapid, labor is saved, convenience is achieved, and practicability is high.

The invention discloses a light-weight corrosion-resistant prestressed concrete cylinder pipe which comprises a steel cylinder, a UHPC pipe core, a BFRP prestressed tendon layer and a mortar protection layer. The two layers of UHPC pipe cores are respectively positioned on the two sides of the steel cylinder; the BFRP prestressed tendon layer is fixed through a split type basalt anchoring device, and the anchoring device comprises an inner layer BFRP-RPM embedded part and an outer layer epoxy resin grouting layer. Variable cross-section thickness distribution is designed in the axial direction of the UHPC pipe core, the end thickness # imgabs0 # of a bell and spigot is 60-80 mm, and the middle thickness # imgabs1 # of the bell and spigot is 40-50 mm; bFRP prestressed tendons are adopted to replace traditional high-strength prestressed steel wires. The BFRP material has excellent corrosion resistance and can keep stable performance in a chloride ion corrosion environment, so that the problem of wire breakage caused by corrosion is avoided, the corrosion resistance of the pipeline is remarkably improved, and the service life of the pipeline is prolonged.