摘要:
A flexible pipe connector (200) for joining a pressurised mains pipe to a service pipe, the connector comprising: • a corrugated longitudinal body portion (202) having a first end (208), a second end (210) and an internal bore therebetween, said longitudinal body portion further comprising a plurality of corrugations spaced along the length thereof, the corrugations defining a maximum internal diameter of the bore at a peak 204 of a corrugation and a minimum internal diameter of the bore at a trough (206) of a corrugation; • a first spigot socket (212) at said first end of the longitudinal body portion; and • a second spigot socket (214) at said second end of the longitudinal body portion; • wherein for a defined volumetric flow rate, the head loss of a fluid flowing through said body portion is no greater than if the fluid were flowing in a smooth bored pipe of the same length and having the same internal diameter as the first and second spigot sockets; and • wherein the minimum internal diameter of said corrugated internal bore is greater than the maximum internal diameter of said first and second spigots.
摘要:
A pipe coupling for triple wall corrugated plastic pipe includes a triple wall corrugated bellmouth connector that is of a unitary construction with one end of the corrugated plastic pipe. This bellmouth connector is of higher strength and in cooperation with the two wall corrugated spigot provides a high strength coupling. This coupling includes the bellmouth connector and spigot that are made inline with the corrugated pipe. A method for the manufacture of the pipe includes controlling of an air pressure on the outside of a formed two wall corrugated pipe as an exterior third wall is secured thereto.
摘要:
A bellows arrangement comprising an extensible bellows part (120) for providing extension and/or contraction of the bellows arrangement, and a first end ring (106) fixed to the bellows part (120). The bellows part (120) comprises an inner bellows (222) and an outer bellows (224), and the inner bellows (222) and the outer bellows (224) are fixed to opposite sides of the first end ring (106).
摘要:
A flexible pipe body (100) and method of producing a flexible pipe body, the flexible pipe body including a collapse resistant layer (801) comprising a radially inner surface and a radially outer surface, the radially inner surface comprising a plurality of substantially regular protrusions (815) and/or depressions extending in a direction perpendicular to a tangent of the radially inner surface, for breaking up a boundary layer (509) of fluid flowing along the flexible pipe body in use.
摘要:
Rohrbauteil mit einem Außenrohrelement und mindestens einem innerhalb des Außenrohrelements angeordneten Innenrohrelement, wobei das Außenrohrelement als flexibles Rohrelement mit mehreren Ausformungen, insbesondere Wellen und / oder mindestens einem Wellabschnitt ausgebildet ist, dadurch gekennzeichnet, dass das Außenrohrelement (1) und das mindestens eine Innenrohrelement (2) an mindestens einer Stelle jeweils eine in radialer Richtung nach außen zeigende Ausformung (11, 12) aufweisen, wobei die Außenseite der Ausformung (12) des mindestens einen Innenrohrelements (2) mindestens teilweise flächig an der Innenseite der Ausformung (11) des Außenrohrelementes (1) oder eines anderen Innenrohrelementes (1) anliegt, so dass mittels der Ausformungen (11, 12) eine Verbindung (15) zwischen dem mindestens einen Innenrohrelement (2) und dem Außenrohrelement (1) besteht. Die Erfindung betrifft ferner ein Verfahren zur Herstellung eines Rohrbauteils.
摘要:
A flexible pipe body and method of manufacturing a flexible pipe body are disclosed. The pipe body includes a tubular layer of corrugated material for forming a collapse resistant layer, wherein a radially outer surface of the layer has alternately repeating grooves and ridges, and a radially inner surface of the layer has respective alternately repeating ridges and grooves, and a filler element provided adjacent the grooves of at least one of the radially outer surface and the radially inner surface, such that for the said surface, the filler element substantially fills a void extending between adjacent grooves and ridges, thereby providing a substantially non-undulating surface along the ridges.
摘要:
A flexible stretch hose with a wall which comprises a spirally wound profile (1; 11; 21) in a plastic material. Consecutive windings of the profile are secured to each other by means of a weld. The profile comprises, in cross-section, at least one bottom section (2; 12) and at least one rib section (4; 14; 24), wherein the rib section of the profile, relative to the bottom section, also forms a protrusion of the wall of the hose which gives the hose a predetermined hub strength. The profile comprises an unfoldable section (5; 15; 25) provided in order to be unfolded under the influence of a tensile; force in the axial direction of the hose, thereby allowing an extension of the hose, wherein the unfoldable section comprises at least two profile sections lying loosely against each other, which sections are interconnected at one end.
摘要:
The invention relates to a method and a mould assembly for rotation moulding a pipe part (1) comprising a main body (2) and a spigot end (3), the spigot (3) end having at least one dedicated section (5) with an outer contour (6) that in use is to effect a close fit with an external part. At least during cool-off A support structure (8) is provided in the pipe part (1), at least during cool-off of said part, to keep the dedicated section (5) into contact with the mould (22) so as to have the outer contour (6) of the dedicated section (5) conform to the inner contour of the mould (22). The support structure may become part of the pipe part during moulding.
摘要:
A refrigeration circuit (3) for household appliances comprises a compressor (4) suitable for compressing a predetermined cooling fluid and for allowing circulation thereof within said circuit (3), a first heat exchanger (5) or condenser in fluid communication with the compressor (4) for allowing cooling and the consequent condensation of the cooling fluid going therethrough, and a second heat exchanger (7) or evaporator in fluid communication with the first exchanger (5) through a circuit with a special device (6) suitable for decreasing the pressure of the cooling fluid and acting at a space (2) to be cooled (normally inside the refrigerator). The second exchanger (7) allows the cooling fluid to evaporate, by heat absorption, thus cooling the space (2) and returning through the tubing (17) to the compressor (4). The cooling fluid circulates from the compressor (4) towards the first exchanger (5), from the latter towards the second exchanger (7), then returning to the compressor (4) for a subsequent cycle. At least one of the heat exchangers (5, 7) comprises a plastic tubing (9), at least one portion whereof exhibits such a corrugated profile as to impart flexibility thereto and/or increase the thermal exchange surface. The tubing in section exhibits a structural layer (100) of plastic material and a layer (101) comprising a film of metal material adapted to constitute a barrier against humidity and gases in general, such shaped as to maintain the tube flexibility.