872results about "Bends" patented technology

The invention relates to the technical field of pipeline noise elimination, in particular to a pipeline elbow noise reduction device which comprises a connecting elbow, an inner silencer is embedded in a bend of an inner cavity of the connecting elbow, a cavity exists between the inner silencer and the inner wall of the connecting elbow, and a neck bush is arranged between the inner silencer and the inner cavity of the connecting elbow. The inner silencer comprises an inflow part, an inward shrinkage part, a flow guide part and a discharge part which are integrally formed through flexible rubber, the inner diameters of the inflow part, the inward shrinkage part, the flow guide part and the discharge part are smoothly and gradually changed in the flow direction, and the outer wall of the inner silencer and the inner wall of the neck bush are seamlessly attached together. The silencer has the beneficial effects that the gradual change section design of the inner silencer maintains a laminar flow boundary layer through continuous curvature change, and flow separation is effectively reduced; the spiral flow guide fins are used for disassembling macroscopic vortex into micro-scale turbulent flow, so that energy dissipation is accelerated, and medium-high frequency noise is improved in a targeted manner; the sound absorption part is filled with an efficient sound absorption material, and a complementary silencing mechanism is formed with flow field optimization.

A connector includes a connecting body with a fluid passage at least part way therethrough, and a seal is provided with an outer portion of a fluid tube. A cartridge proximate to the connecting body has a hollow portion therethrough. A grab part has at least one tooth to retain the fluid tube and is between the cartridge and the seal. A demount part within the hollow portion moves the teeth to allow release of the fluid tube. A latch is located on one of the connecting body or a sleeve covering at least part of the cartridge or the connecting body. A mating catch is located on the other of the sleeve or the connecting body, and engagement of the latch with the catch connects the sleeve to the connecting body and helps restrain cartridge movement.

The utility model discloses a combined pipeline elbow anti-blocking mechanism, relates to pipeline elbow technical field, including elbow body, elbow body includes elbow, liquid outlet pipe, liquid inlet pipe and mount seat, liquid outlet pipe is fixedly connected with one end of elbow, liquid inlet pipe is fixedly connected with the other end of elbow, and the mount seat is fixedly connected with the elbow. The controller is used for controlling the pulse electromagnetic valve to be started, compressed air in the high-pressure air cylinder is conveyed into the air conveying pipe through the pulse electromagnetic valve and the air cylinder connecting base, and therefore the compressed air is conveyed into the air spraying pipe through the connecting pipe; when the elbow is blocked, pulse airflow is jetted into the elbow through the air jet holes, so that impurities possibly accumulated in the elbow are impacted and disturbed, the impurities flow along with fluid again, blockage is avoided, and the blocking effect of the elbow is improved.

The invention discloses a spliced water-saving hose for agricultural irrigation, and belongs to the technical field of agricultural irrigation. A splicing type water-saving water hose for agricultural irrigation comprises a water hose body, one end of the water hose body is connected with a first access assembly, and all-directional sealing and fixing at the splicing position are achieved through a triple cooperative structure of an L-shaped connecting block and an arc-shaped fixing groove, a first annular connecting block and a second annular groove, and a double-semi-arc-shaped fixing block and the first annular groove; after the L-shaped connecting block is embedded into the first rectangular connecting groove, the L-shaped connecting block is rotationally locked through the arc-shaped fixing groove, transverse and longitudinal dual mechanical limiting is formed, the joint is prevented from being separated when the water hose is pulled or impacted by water pressure, and the first annular connecting block is precisely matched with the second annular groove to form a first sealing barrier to prevent water flow from leaking from a joint gap; the double semi-arc fixing blocks are automatically embedded into the first annular grooves under the action of the reset springs, the structural stability is enhanced, second sealing is formed, and the water seepage path is further isolated.

The utility model discloses a negative pressure valve connecting elbow of a negative pressure drainage system, and particularly relates to the technical field of elbow pipe fittings, the negative pressure valve connecting elbow comprises an elbow pipe, a straight pipe and a connecting pipe which are sequentially arranged from left to right, an extension pipe is arranged in the straight pipe, the elbow pipe is in flange connection with the straight pipe, the extension pipe is in flange connection with the connecting pipe, and a negative pressure valve is arranged on the connecting pipe. A sealing assembly is arranged at one end of the extension pipe, and an abutting disc used for abutting against the sealing assembly is arranged on the outer side of the extension pipe. A sealing plate is connected to a flange at the end, back on to the bent pipe, of the straight pipe, a first driving structure and a second driving structure are arranged on the sealing plate, the first driving structure is connected with the sealing assembly, and the second driving structure is connected with the abutting disc. The sealing assembly comprises a fixing ring, the fixing ring is fixedly connected to one end of the outer surface of the extension pipe, and the ring side of the fixing ring is sleeved with a sealing ring; the connecting elbow solves the technical problem that the installation applicability is reduced due to the fact that an existing connecting elbow does not have the installation compensation capacity.

The application discloses a sleeve type elbow pipe sliding block device and a use method thereof, and belongs to the technical field of elbow pipes of dredging ships. The sleeve type elbow pipe sliding block device comprises a sliding block seat sliding on a lateral guide rail of a ship body, further comprises a hinged arm structure, the hinged arm structure is rotationally connected with the sliding block seat, and an elbow pipe body is arranged in the hinged arm structure; a first connecting piece is fixedly arranged on one side of the sliding block seat and rotationally connected with the elbow pipe body; a sealing piece is fixedly connected with the first connecting piece and used for sealing a gap between the elbow pipe body and the first connecting piece; and a second connecting piece is fixedly connected with the sliding block seat. The application changes the stress of the elbow pipe body from the structural design, so that the elbow pipe no longer bears the pulling force of the rake pipe, the pulling force burden is released, the design focus is on the wear resistance, the wear-resistant surfacing pipe type is adopted, the service life of the elbow pipe is prolonged, the repair period of the elbow pipe body is prolonged, and the construction efficiency of the dredging ship is ensured.

The utility model relates to a siphon pipeline drainage device which comprises a building, a gutter and a siphon device, the gutter is arranged on the roof of the building, the siphon device comprises a siphon, a water collecting tank, a sewer pipe, a water suction pipe, an electric valve and a three-way valve, the sewer pipe is connected to the bottom of the water collecting tank, the water suction pipe extends into the gutter, and the water collecting tank is higher than the gutter. The water outlet end of the siphon is lower than the gutter, the water inlet end of the siphon is communicated with the water suction pipe and the sewer pipe through a three-way valve, and an electric valve is arranged on the siphon. In a water storage state, the siphon device can enable rainwater collected by the water collecting tank to flow into the siphon, and the whole siphon is filled with collected water; in the drainage state, the siphon device sucks water in the gutter towards the water suction pipe through the siphon effect, and the water in the gutter is drained to the siphon through the water suction pipe and then drained outdoors. According to the siphon pipeline drainage device, accumulated water in a gutter can be drained in time when the rainfall is large, and the problem that a building leaks rain when the gutter is full of water is solved.

Maintenance kit for a hydraulic system equipped with suction (13) and delivery (14) pipes that define a first connection interface (61), the kit comprising: - at least one pump, said pump having a second connection interface configured for reversible coupling with said first connection interface (61); - a connector element (50) equipped with a third connection interface (51, 52); wherein the third connection interface (51, 52) of said connector element (50) is dimensionally and functionally identical to the second connection interface of said pump, so that said connector element (50) and said pump are mutually interchangeable for coupling with the second connection interface of the hydraulic system, said first, second, and third connection interfaces being configured for coupling by means of reversible fastening means (60) that ensures a hermetic seal of the system under pressure without the need for additional sealing materials.

An agricultural implement (10) includes a frame supported by a plurality of wheels and carrying a toolbar (22) and at least one central hopper (20), a plurality of material applicators (204) carried by the toolbar (22), and a plurality of flow lines (26) fluidly connecting the at least one central hopper (20) to the material applicators (204). Each flow line (26) includes at least one composite elbow (210), and each composite elbow (210) has a polymeric body (302) and a wear-resistant plate (314) within the polymeric body (302). The outlet of the polymeric body (302) has an orientation different from the inlet (304) thereof, and the wear-resistant plate (314) is oriented to deflect material traveling along a central longitudinal axis (A1) of the inlet (304) toward a direction of a central longitudinal axis (A2) of the outlet (306). A method of forming a composite elbow (210) includes disposing a wear-resistant plate (314) within a polymeric body (302) as disclosed.

This document describes fluid coupling devices for fluid handling systems. For example, some embodiments described in this document relate to fluid coupling devices that snap together, and are then secured to each other using a collar and collet mechanism. Some fluid coupling devices described herein are well suited for use in systems that provide fluid cooling for heat generating devices such as computer hardware. The fluid coupling devices described herein are also suitable for many other uses.

The invention belongs to the technical field of pump body conveying, and particularly discloses a diaphragm pump conveying device and an organic fluorine intermediate synthesis conveying method.The diaphragm pump conveying device comprises a base, a pump body, a driving part, diaphragm agitating mechanisms, a discharging pipe and a feeding pipe; one end of the driving part penetrates through the interior of the pump body to drive the diaphragm agitating mechanisms to move, the driving part is fixedly installed above the base, the sides, away from each other, of the two diaphragm agitating mechanisms communicate with vertical pipes, the discharging pipe is located above the two vertical pipes, and the feeding pipe is located below the two vertical pipes; the problems that vibration leakage occurs, sealing is not stable, and leakage is difficult to perceive are solved, sealing is reliable, vibration reduction and looseness prevention are achieved, monitoring is timely, and the organic fluorine intermediate conveying device is suitable for safe conveying of organic fluorine intermediates.

The utility model belongs to the technical field of pipeline silencing, and particularly relates to a silencing device for spring water direct drinking project construction, which comprises a water inlet pipe, a water outlet pipe, a first water delivery pipe, a spiral guide layer, a second water delivery pipe and a silencing layer, multiple groups of silencing holes are formed in the first water conveying pipe in the water flow impact direction, the spiral guide layer is fixedly arranged between the first water conveying pipe and the second water conveying pipe, and the silencing layer detachably sleeves the second water conveying pipe; the sound insulation device has the advantages that impact of water flow on the water conveying pipelines is reduced, the sound insulation effect is enhanced, and troubles of life noise on residents are relieved.

The present application relates to a kind of pressure measuring anti-pulling pipe sealing joint and its anti-pulling sealing method, it includes main joint, secondary joint, and the pipe clamp sealing assembly in the inner cavity formed by main joint and secondary joint, pipe clamp sealing assembly includes first sliding sleeve, second sliding sleeve, variable-diameter clamp cover, first sliding sleeve, second sliding sleeve, variable-diameter clamp cover three are mutually abutted when main joint and secondary joint are screwed and connected, first sliding sleeve forms preliminary sealing with pipe by annular sealing ring, variable-diameter clamp cover forms preliminary clamping to pipe;When gas-liquid is introduced into main joint, axial thrust in the direction of pipe pulling off is formed to pipe by gas-liquid pressure, and first sliding sleeve, second sliding sleeve, variable-diameter clamp cover three are further mutually abutted by gas-liquid pressure, corresponding annular sealing ring is further deformed, variable-diameter clamp cover is further shrunk and clamped, and the blade of variable-diameter clamp cover cooperates with the axial thrust of pipe and forms oblique cutting, realizes effective anti-backout anti-pulling structure, and with the increase of the pressure in pipe, the sealing property and anti-backout anti-pulling performance of pipe are self-adaptively improved.

The utility model discloses a seamless wear-resistant elbow which comprises an elbow pipe, the two ends of the elbow pipe are connected with straight pipes through flange plates, the middle of the elbow pipe is fixedly sleeved with a fixing sleeve, the end wall of the fixing sleeve is fixedly connected with supporting rods, the movable ends of the supporting rods abut against the end walls of the flange plates, and one end wall of the fixing sleeve is connected with at least two supporting rods. The bent pipe is provided with a plurality of layers and comprises a corundum ceramic layer, a transition layer and a metal layer from inside to outside. By means of the multi-layer composite pipe structure, the abrasion resistance, the heat resistance, the hardness and the strength of the elbow are improved, a supporting structure is formed outside the elbow through the fixing sleeve and the supporting rod, and the strength and the stability of the elbow are further improved.

The application discloses an erosion-resistant elbow and a preparation method thereof, and specifically comprises the following steps: (1) structure design and blank preparation; (2) preparation of cladding powder; (3) pretreatment; (4) laser cladding treatment; and (5) post-treatment. According to different erosion degrees of different regions of the inner wall of the elbow, different cladding layers are designed, and reasonable elbow structures and cladding materials are designed, so that the erosion-resistant performance of the inner wall of the elbow is maximally improved.

The utility model discloses an air conditioner pipeline buffer assembly combined structure, and relates to the technical field of air conditioner pipelines. The spiral pipe comprises a pipe body and a spiral pipe fitting arranged on one side of the pipe body, and further comprises a support plate arranged at the upper end of the spiral pipe fitting, and a connecting mechanism is arranged on the inner side of the support plate; the connecting clamping ring is arranged at one end of the pipe body; the connecting guide pipe is connected to the end, away from the spiral pipe fitting, of the pipe body. The spiral pipe fitting is designed to be of a spiral structure, meanwhile, the temperature and the flow speed of compressed air flowing at a high speed from an air compressor can be effectively controlled, Z-shaped supports are adopted in the support plate and the connecting mechanism, a multi-face bolt connecting structure is adopted, the structure is more stable, the high tension and compression resistance is achieved, and then the spiral pipe fitting is not prone to falling off. Rubber pads can also be arranged in the arranged connecting clamping rings and can be combined for bearing, on one hand, normal movement of the smooth contact face of the pipe wall is ensured, and on the other hand, a good insulation effect is provided on the premise that shock absorption is ensured.

The utility model discloses a filtering type rotary joint which comprises a rotary sealing sleeve and a combined storage hole, the combined storage hole is formed in the center of the interior of the rotary sealing sleeve, a connecting through hole is formed in the center of the top end of the rotary sealing sleeve, and the connecting through hole is communicated with the combined storage hole. A first sealing ring is mounted at the top end of the interior of the combined storage hole in a bonded mode, and a second sealing ring is mounted on the bottom face of a frame of the rotary sealing sleeve in a bonded mode. According to the filter type rotary joint, when a filter core column needs to be replaced, after a rotary connecting pipe is separated from an external pipeline, the rotary connecting pipe is pressed forcibly, the rotary connecting pipe and an adjusting circular ring can slide in a rotary sealing sleeve, the adjusting circular ring pushes a supporting spring to contract and operate, and the filter core column is separated from the external pipeline according to the limitation of a limiting supporting frame; and therefore, replacement operation can be quickly carried out.

A branch pipe installation for branching from a vertical pipe comprises a branch connection attached to the vertical pipe having a vertical portion with a reduced cross section forming a nozzle configured to increase the velocity head of water passing through the nozzle, an expansion chamber located directly below the nozzle and having a cross-sectional area larger than the cross-sectional area of ​​the vertical pipe, a branch protruding from the expansion chamber, a floor outlet, and a branch pipe connecting the branch to the floor outlet.

The utility model discloses a building water supply and drainage pipeline bent pipe fitting which comprises a bent pipe part, a pipeline part, a mounting cylinder and a sealing assembly, the mounting cylinder is inserted into the bent pipe part and the pipeline part respectively, and the mounting cylinder, the bent pipe part and the pipeline part are connected and limited through a fixed connecting rod and a fixed connecting cap. The sealing assemblies are symmetrically arranged on the two sides of the mounting cylinder and used for sealing the connecting position of the mounting cylinder and the bent pipe part and the connecting position of the mounting cylinder and the pipeline part. According to the building water supply and drainage pipeline bent pipe fitting, the multiple sealing effect can be achieved between the bent pipe part and the pipeline part, the actual sealing effect is very good, butt joint positioning can be conveniently conducted between the bent pipe part and the pipeline part, and water leakage caused by the fact that the sealing effect is reduced in the long-term use process is prevented; and the fixed connecting rod and the fixed connecting cap are arranged at the joint of the bent pipe part and the pipeline part at equal angles, so that the bent pipe part and the pipeline part can be butted and fixed very conveniently and stably.

The elbow pipe fitting with the exhaust structure and the drainage structure comprise an elbow body and an exhaust pipeline, and the elbow body comprises a first connector and a second connector which are located at the two ends. The exhaust pipeline is located on the outer side of the elbow body and integrally formed with the elbow body, the first end of the exhaust pipeline is communicated with the elbow body, and the second end of the exhaust pipeline extends in the direction opposite to the second connector. According to the elbow pipe fitting, an exhaust branch can be formed on the outer side of the elbow pipe fitting through the exhaust pipeline. In the drainage process, water flows in from the first connector and flows out from the second connector, air remaining in the pipeline can be exhausted upwards from the exhaust pipeline, air pressure balance in the pipeline is maintained, and smooth and efficient drainage can be achieved.

This application provides a method for installing an extra-large drainage system, comprising the following steps: S1. Arranging a sliding device along the installation axis inside the extra-large concrete pipe, and setting a lifting device on the sliding device; S2. Sliding x extra-large drainage systems sequentially to their corresponding positions on the sliding device using the lifting device, controlling the distance between two adjacent extra-large drainage systems to be a, where a is less than b; S3. Continuing to assemble the remaining (n-x) extra-large drainage systems, but controlling the distance between two adjacent extra-large drainage systems to be b; S4. Sliding the second to nth extra-large drainage systems together until the distance between the second and first extra-large drainage systems is b; repeating the above sliding process until the distance between the xth to (x-1th)th extra-large drainage systems is b, thus completing the installation of the extra-large drainage system. This application solves the problem of interference between lifting machinery and pipe cavities due to limited space, and realizes the installation of extra-large drainage systems in confined spaces.

The utility model relates to the technical field of steel pipe elbows, and discloses a steel pipe elbow with a lengthening function, which comprises an elbow steel pipe, a connecting mechanism, a connecting steel pipe, an outer sealing gasket and an inner sealing gasket, the connecting mechanism is arranged at the connecting position of the elbow steel pipe and the connecting steel pipe, and the connecting mechanism comprises two semicircular shells and a hinge. Clamping blocks are fixedly connected to the sides, close to the elbow steel pipe, of the interiors of the two semicircular shells, springs are fixedly connected to the upper portions and the lower portions of the sides, away from the elbow steel pipe, of the two clamping blocks, moving blocks are fixedly connected to one ends of the two springs on the same side, and rubber pads are fixedly connected to the sides, away from the elbow steel pipe, of the interiors of the two semicircular shells. According to the utility model, the relative position of the elbow steel pipe and the connecting steel pipe can be adjusted through the matched use of the elbow steel pipe and the connecting steel pipe, and meanwhile, the connection between the adjusted elbow steel pipe and the connecting steel pipe is firmer through the connecting mechanism.

The utility model discloses a wear-resistant and high-temperature-resistant elbow which comprises an elbow body, a gas flow channel penetrating through the other end of the elbow body from one end of the elbow body is arranged in the elbow body, a bent section is arranged in the middle of the elbow body, the bent section is defined by an outer arc-shaped area and an inner arc-shaped area, and gas flowing into the gas flow channel impacts the outer arc-shaped area and then flows out. An inner flitch plate is fixed to the inner surface of the outer arc-shaped area, the outline of the inner flitch plate is matched with the shape of the inner surface of the outer arc-shaped area, the inner flitch plate is matched with the inner surface of the outer arc-shaped area in an attached mode, a wear-resistant layer is arranged on the face, facing the gas flow channel, of the inner flitch plate, and a high-temperature-resistant layer is attached to the outer surface of the elbow body. The abrasion resistance of the inner surface of the outer arc-shaped area with the weakest abrasion resistance of the elbow can be effectively improved, and the service life of the abrasion-resistant and high-temperature-resistant elbow is greatly prolonged.

The utility model discloses a steering branch pipe seat which comprises a first pipe section and a second pipe section which are connected into a whole, the included angle between the first pipe section and the second pipe section ranges from 90 degrees to 180 degrees, the first pipe section is used for being connected with a branch pipe, and the second pipe section is used for being connected with a main pipe. A conical part is integrally arranged at the end, away from the first pipe section, of the second pipe section, an open hole is formed in the main pipe, and the conical part is welded to the open hole in a socket mode. The steering branch pipe base is simple and reliable in structure, convenient to weld and construct, capable of saving space and welding construction amount, suitable for the situation that branch pipes with different angles are connected into a main pipe, capable of solving the problems that a conventional branch pipe base is not prone to centering in welding and large in welding difficulty, capable of meeting the connecting requirements of the branch pipes with different connecting angles, good in adaptability and high in practicability. And the problem that a conventional branch pipe seat and a branch pipe cannot be directly welded or a large welding operation space is needed is solved, and the device can be used under various working conditions and is wide in application.

The application provides a hydropower station safety valve connecting pipe reinforcing device and a hydropower station safety valve connecting pipe reinforcing method, relates to the technical field of hydropower station operation and maintenance, and is designed to solve the problem of local weakness of the hydropower station safety valve connecting pipe. The hydropower station safety valve connecting pipe reinforcing device comprises a sleeve pipe, the sleeve pipe comprises two detachably connected sub-sleeve pipes, and the shapes of the two sub-sleeve pipes are symmetrically arranged along the symmetry plane of the hydropower station safety valve connecting pipe. The hydropower station safety valve connecting pipe reinforcing method comprises the following steps: obtaining parameters of the connecting pipe to be reinforced and modeling; prefabricating the sleeve pipe; on-site processing of the connecting pipe; and installing the sleeve pipe on the connecting pipe. The hydropower station safety valve connecting pipe reinforcing device provided by the application can reduce the safety hazards at the hydropower station safety valve connecting pipe.

The utility model discloses a quick-screwing connector easy to disassemble, which relates to the technical field of quick-screwing connectors and comprises a connector assembly, a locking and sealing assembly, a locking and sealing assembly and a locking and sealing assembly. The guide assembly is used for guiding the hose; the locking and sealing assembly comprises an adjusting nut which is arranged on the outer side of the second connecting part in a sleeving mode and is in threaded connection with the second connecting part, and the left side of the adjusting nut is rotationally connected with a movable pressing ring through a bearing; an avoiding groove matched with the second connecting part is formed in the right side of the adjusting nut, and a pressing groove is formed in the left side of the movable pressing ring. When the hose is disassembled, the adjusting nut and the movable pressing ring cannot be sleeved outside the hose to be synchronously disassembled, so that the adjusting nut and the movable pressing ring do not need to be recycled independently subsequently, and the disassembling process is more convenient.

The utility model relates to a connecting device for a suspended hood, which comprises a connecting pipe unit, a buffer unit and a joint unit, and the buffer unit is removably arranged in the connecting pipe unit. The connecting rod has the advantages that compared with an existing integrally-formed connecting rod, the connecting pipe unit and the buffering unit are detachably connected, the problem that a new connecting device is replaced due to the fact that the buffering unit is damaged is avoided, only the buffering unit needs to be replaced, and the production cost is greatly reduced; compared with an existing integrally-formed connecting rod, under the same cost, a combination of one connecting pipe unit and a plurality of buffering units and a combination of a plurality of connecting pipe units and a plurality of buffering units can be formed, and the technical effect of a longer service cycle (life cycle) is achieved; in the same service cycle, a combination of one connecting pipe unit and a plurality of buffer units can be formed, and the technical effect of lower production cost is achieved.

The utility model discloses a U-shaped pipe with an anti-deformation function, and belongs to the technical field of U-shaped pipe positioning. The protective device comprises a U-shaped pipe, a protective rack and a pipeline stabilizing mechanism, the pipeline stabilizing mechanism is arranged at the bottom of the U-shaped pipe, the protective rack comprises a vertical plate, the top and the bottom of the vertical plate are connected with a transverse plate, wrapping sleeves are arranged on the two sides of the transverse plate, a connecting mechanism comprises first connecting plates, and the first connecting plates are fixedly connected to the two sides of the front face and the back face of the transverse plate. By arranging the connecting mechanism, the transverse plate and the wrapping sleeve are connected, the U-shaped pipe is fixed through the transverse plate and the wrapping sleeve, the fixing shell can be fixed through the fixing mechanism, the U-shaped pipe is positioned through the fixing shell, the phenomenon that the U-shaped pipe shakes is prevented, the bearing capacity of the U-shaped pipe can be increased when an operator uses the U-shaped pipe for a long time, and the U-shaped pipe is prevented from shaking. The phenomenon that the U-shaped pipe deforms due to the influence of various forces is avoided, and deformation of the U-shaped pipe can be prevented.

To propose a fitting for a secondary pipeline of a double pipe system which can be produced in a simple and low-cost manner and in which it is possible to check the connecting points of the primary and secondary pipelines during assembly.SOLUTION: A fitting includes: two half-shells 2 composed of plastic, wherein each of the half-shells has an integrated heating wire, wherein each heating wire is arranged in the region of a connecting piece 4 and the heating wire has a plurality of meandering windings, wherein each heating wire is arranged in a groove provided for the heating wire in the half-shell; and connecting elements 7 which connect the two half-shells. The fitting has spacer elements arranged on the inner circumference of the half-shells for concentric arrangement of the fitting with respect to a primary pipeline.SELECTED DRAWING: Figure 1