Transport piping for pneumatic material transport system, transport piping forming method and connection piece

Abstract

The connecting piece (1) for pipe connection comprises a tubular envelope (2) having a first end (3) and a second end (4), a flow path (5) bounded by an inner surface (6) of the envelope of said connecting piece and arranged between the first end (3) and the second end (4), a first connection area (7) extending at a distance from the first end (3) and a second connection area (8) extending at a distance from the second end (4), said connecting piece being configured to bend at an angle (α) between 0 degrees and 22 degrees to a first plane, such as a vertical plane, and / or configured to bend at an angle (β) between 0 degrees and 20 degrees to a second plane, such as a horizontal plane.The present invention relates to a transportation pipeline and a method.

Description

[Technical field]

[0001] The present invention relates to a transport pipe for a pneumatic transport system for solid materials.The present invention also relates to a method for forming a transport pipe connection.The present invention also relates to a connection piece. [Background technology]

[0002] In connection with pneumatic material transport systems, metal pipes have often been used for the transport piping. In large systems, especially with long material transport distances, the length of the transport piping, especially the main piping, can be quite long, typically several kilometers long. The pipe diameters of the transport piping in known systems are rather large, between 200 and 800 mm, and the cost of piping made of metal pipes is quite high.

[0003] This problem has been alleviated by forming the material transport piping from plastic or plastic composite materials. Pneumatic material transport systems often transport materials that require wear resistance of the pipe sections. In particular, pneumatic transport systems for solid waste often transport materials that have specific requirements for wear resistance of the transport piping. Such materials include, for example, glass, metal, sand, and similar materials. Pipe sections that are subject to wear include, for example, pipe elbows and various connections. It has also been found that the plastic material on the inner surface of the pipe wears more when the temperature of the pipe increases, for example due to friction, such as contact between the transport material and the inner surface of the pipe, or due to external conditions.

[0004] Furthermore, different radii of curvature of the transport pipes are often required. Pipe sections made of plastic or plastic composites require heat treatment in order for the pipe section to maintain its bent shape. Heat treatment may be very limited or even impossible, especially in installation conditions. When bending the pipes, there is also a risk that the size and shape of the pipe orifices may change in an undesirable way, leading to pipe kinking, which may have a negative effect on the functioning of the system, especially in pneumatic transport pipes intended for the transport of solid waste.

[0005] In particular in transportation pipelines made of plastic or plastic composite pipes, muff connections are often used to connect the ends of separate pipe sections together. In these connections, the ends of the pipe sections to be connected together are connected to a muff, i.e. a connecting sleeve section, which is arranged at the connection point so that they are located within the muff, and to a muff arranged around the connection point and extending in the longitudinal direction of the pipe for a distance in both directions from the connection point. A heat resistor or the like is provided at the connection point of the connection sleeve section or the pipe section, and a current is supplied to the resistor when the connection is made, thereby heating the resistor and forming a connection between the connection sleeve section and the pipe section. Such thermoplastic pipe connections are described, for example, in Patent Documents 1 to 3. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] U.S. Patent No. 2,739,829 [Patent Document 2] U.S. Pat. No. 4,530,521 [Patent Document 3] U.S. Pat. No. 4,906,313 Summary of the Invention [Problem to be solved by the invention]

[0007] In many cases, the transport pipe actually requires a relatively small angular change in the direction of the transport pipe, which can be difficult to achieve in installation conditions where the pipe includes reinforcement, is rigid and / or is entirely made of a wear-resistant material, such as a metal.

[0008] The object of the present invention is to provide a completely new solution for the transport piping of pneumatic solid material transport systems, which arrangement avoids the problems of the prior art. One important object is to provide a transport piping suitable for pneumatic transport piping of waste transport systems. Another object is to provide a solution which avoids the problems of the prior art for transport piping made mainly of plastic or plastic composite materials. The object of the present invention is to provide a pipe section which can be bent to the desired shape even in installation conditions and which can be easily connected to plastic composite and plastic pipes as well. One object is to provide a pipe section which has wear-resistant properties suitable for use in the transport piping of pneumatic transport systems for solid waste materials.

[0009] Another object is to provide a solution for connecting pipe sections of a transportation pipeline to one another, whereby the most typical connection welding methods or adhesive bonding of plastics, in particular plastic pipes, can be used.

[0010] The invention is based on the idea that the tube section comprises a combination of metallic reinforcement sections, such as steel tubes, around which a tubular plastic composite layer or plastic layer is arranged. The plastic tube can be heated and the steel tube can be pushed into the channel of the plastic tube. When the plastic tube cools down, it can shrink on the steel tube. The tube section can be connected to the other tube section by plastic welding or gluing, either directly with the plastic or plastic composite section or via a sleeve section. In this configuration, a special connection piece can be provided between the tube sections connected to each other. The connection piece can provide a change of direction between the tube sections. In one embodiment, the connection piece is a tube section. According to one embodiment, the connection piece can be a flexible tube section. According to one embodiment, the connection piece can be a flexible material. According to one embodiment, the connection piece can be plastic. According to one embodiment, the connection piece can be a composite material. According to one embodiment, the connection piece can be metal. According to an embodiment, the connection piece may be configured to bend at an angle (α) between 0° and 20° to a first plane, such as a vertical plane, and / or may be configured to bend at an angle (β) between 0° and 20° to a second plane, such as a horizontal plane. According to an embodiment, the first plane may be a plane passing through the longitudinal axis of the tube. According to an embodiment, the connection piece may be formed with a portion that limits the bending. According to an embodiment, the connection piece may be formed with portions protruding from a surface of the connection piece and / or recesses and protrusions therebetween. According to an embodiment, the protruding portions and / or recesses may comprise portions in a direction transverse to the longitudinal direction of the connection piece. According to an embodiment, the protruding portions and / or recesses are arranged at intervals from each other. According to an embodiment, the protruding portions and / or recesses may comprise annular portions. According to an embodiment, the protruding portions and / or recesses may comprise segments arranged to be distributed along the circumference of the connection piece. According to one embodiment, the portion limiting the bending of the connecting piece may be arranged to limit the bending of the connecting piece to between 0 degrees and 20 degrees with respect to the longitudinal axis, for example.According to an embodiment, the distance between adjacent protruding portions and / or recesses may be set such that, when the walls of the protruding portions and / or recesses are in contact with each other, in the bent position, the side surfaces of the adjacent protruding portions and / or recesses limit the degree of bending of the connecting piece. According to an embodiment, the wall of the connecting piece may be thinner in the portion comprising the protruding portion and / or recess than in the side of the connecting piece. According to an embodiment, the portion comprising the protruding portion and / or recess may be located in a portion between the first and second side of the connecting piece, for example in the middle portion of the connecting piece. According to an embodiment, the connecting piece may be arranged to allow a different degree of angular change in a first longitudinal plane, such as a vertical plane, than in a longitudinal plane perpendicular thereto, such as a horizontal plane. According to an embodiment, the connecting piece may be provided with a limiting member formed in a region of its periphery, which allows different degrees of bending. According to an embodiment, the limiting member allowing different degrees of bending may have different dimensions or shapes in different regions. According to an embodiment, the limiting member allowing different degrees of bending may have different dimensions or shapes in different regions, so as to allow different degrees of bending in the plane of the different regions. According to an embodiment, the portion with the protruding portion and / or the recessed portion may be different in different regions of the periphery, thereby allowing different degrees of bending. According to an embodiment, the connection piece may be arranged so as to allow different degrees of angular change in the vertical plane when it is bent upward from the horizontal plane and when it is bent downward from the horizontal plane. According to an embodiment, the connection piece may be arranged so as to allow a smaller angular change upward from the horizontal plane than an angular change downward from the horizontal plane. According to an embodiment, the connection piece may be arranged so as to be able to be bent upward between 0 degrees and 10 degrees from the horizontal plane. According to an embodiment, the connection piece may be arranged so as to be bent downward between 0 degrees and 20 degrees from the horizontal plane. According to an embodiment, the connection piece may be arranged so as to allow a smaller angular change downward from the horizontal plane than an angular change upward from the horizontal plane. According to an embodiment, the connection piece may be arranged so as to be bent downward between 0 degrees and 10 degrees from the horizontal plane.According to one embodiment, the connection piece may be arranged to be bent upwards between 0 and 20 degrees from the horizontal plane. According to one embodiment, the connection piece may be rotated to bend the connection piece to a desired bending plane through a desired angle range.

[0011] According to an embodiment, the conveying pipe comprises a first pipe section, a connection section and a second pipe section. Thereby, the angle between the directions of the first and second pipe sections can be changed by the connection section. According to an embodiment, the direction of the first and second conveying pipe sections can be changed by the connection section between 0 degrees and 20 degrees from the direction of the first pipe section. According to an embodiment, the angle between the directions of the first and second pipe sections can be changed by the connection section between 0 degrees and 20 degrees in the horizontal plane and between 0 degrees and 20 degrees in the vertical plane. According to an embodiment, the angle between the directions of the first and second pipe sections can be set to be changeable by a connection piece, and the property of the connection piece can be set to allow a different degree of angle change in the horizontal plane than in the vertical plane. According to an embodiment, the angle between the directions of the first and second pipe sections can be set to be changeable by a connection piece, and the connection piece can be arranged to allow a different degree of angle change in the vertical plane when the pipe section is bent upward from the horizontal plane and when the pipe section is bent downward from the horizontal plane. According to an embodiment, the angle between the directions of the first and second pipe parts may be set to be changeable by a connecting piece, and according to an embodiment, the connecting piece may be arranged so that the angle change from the horizontal plane upward is smaller than the angle change from the horizontal plane downward. According to an embodiment, the angle between the directions of the first and second pipe parts may be set to be changeable by a connecting piece, and the connecting piece may be arranged so that the angle change from the horizontal plane downward is smaller than the angle change from the horizontal plane downward. According to an embodiment, the angle between the directions of the first and second pipe parts may be set to be changeable by a connecting piece, and the connecting piece may be arranged so that the angle change from the horizontal plane downward is smaller than the angle change from the horizontal plane upward. According to an embodiment, the angle between the directions of the first and second pipe parts may be set to be changeable by a connecting piece, and the connecting piece may be arranged so that the angle change from the horizontal plane downward is smaller than the angle change from the horizontal plane upward. According to an embodiment, the angle between the directions of the first and second pipe parts may be set to be changeable by a connecting piece, and the connecting piece may be arranged so that the angle change from the horizontal plane downward is smaller.According to an embodiment, the angle between the directions of the first and second tube parts may be set to be changeable by a connecting piece, which may be arranged to be bent upwards between 0 degrees and 20 degrees from the horizontal plane. According to an embodiment, the connecting piece can be bent to a desired bending plane in a desired angle range by rotating the connecting piece. According to an embodiment, the angle between the directions of the first and second tube parts may be set to be changeable by a connecting piece, which may comprise a limiting member formed in the region of its periphery, which allows bending at different angles. According to an embodiment, the angle between the directions of the first and second tube parts may be set to be changeable by a connecting piece, which may be bent to a desired bending plane in a desired angle range by rotating the connecting piece.

[0012] According to an embodiment, the first pipe section may have a reinforcement or a wear resistant inner surface and the second pipe section may have a reinforcement or a wear resistant inner surface. According to an embodiment, the length of the connecting piece and the angular change between the first and second pipe sections may be set depending on the size and / or speed of the transported material, so that the material moves with the air flow from the first transport pipe section to the second transport pipe section and does not come into substantial abrasive contact with the connecting piece. According to an embodiment, the length of the connecting piece and the angular change between the first transport pipe section and the second transport pipe section are set depending on the size and / or speed of the transported material, so that the material moves with the transport air flow from the first transport pipe section to the second transport pipe section in the transport pipe section of the material transport pipe of the pneumatic material transport system without substantial abrasive contact with the connecting piece. Thus, it is possible to apply a connecting piece with preferred properties, which does not necessarily have to have the same excellent abrasion resistance as a transport pipe having an inner surface with which the transported material may come into substantial abrasive contact. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a vertical cut view of one embodiment of a transportation pipeline. [Diagram 2] FIG. 2 is a vertical cut view of one embodiment of the transportation pipeline. [Diagram 3] FIG. 3 is a horizontal cut view of one embodiment of the transportation pipeline. [Figure 4] FIG. 4 shows a detailed view of the connection area of ​​one embodiment of the transportation pipeline. [Diagram 5] FIG. 5 is a vertical cut view of one embodiment of a connecting piece of a transport pipeline. [Figure 6] FIG. 6 is a view showing one embodiment of a connecting piece of a transportation pipeline as viewed from the direction of arrow A in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] FIG. 1 is a partial cross-sectional view of a portion of the transport piping of a pneumatic material transport system according to an embodiment. The transport piping may comprise a first transport piping section 20 and a second transport piping section 21. The transport piping sections 20, 21 may be connected to each other via a bent piece 1 and a muffler 22, i.e. a connecting sleeve section 22. The end 23 of the first transport piping section 20 may be arranged opposite the first end 3 of the bent sleeve 1. The first end 3 of the bent sleeve 1 of the first transport piping section 20 may be arranged in the muffler, i.e. the connecting sleeve section 22. The connecting sleeve section 22 may have a heating means, such as a heat resistance wire, which heats up when an electric current is supplied to it. The connecting sleeve section 22 may be provided with connection points 41, 42 known per se, which may be coupled to a heat resistance wire 43 (shown in FIG. 4) or may be connected to an electric current. The resistance wire 43 may be arranged as a coil in the connecting sleeve section 22. As a result of heating the resistance wire 43, a connection, such as a thermoplastic connection, may be formed in a manner known per se between the connection sleeve part 22, the first transport pipe section 20 and the bent sleeve part 1. Correspondingly, the end 24 of the second transport pipe section 21 may be arranged opposite the second end 4 of the bent sleeve 1. The second end 4 of the bent sleeve 1 of the second transport pipe section 21 may be arranged in the other muffler, i.e. in the connection sleeve part 22.

[0015] The first transport pipe section 20 may comprise a reinforcement section 26 and a plastic material section 25 formed or arranged around the reinforcement section 26. The second transport pipe section 21 may comprise a reinforcement section 28 and a plastic material section 27 formed or arranged around the reinforcement section 28. The transport pipe section may be formed, for example, by heating the tubular plastic material sections 25, 27 and inserting the tubular reinforcement sections 26, 28 into the channel spaces of the plastic material sections. When the tubular plastic material sections 25, 27 cool, they may harden around or on the tubular reinforcement sections. An inner surface 32 of the plastic material section thus abuts against an outer surface 31 of the reinforcement section. An inner surface 30 of the reinforcement section thus constitutes a channel surface of the transport pipe section.

[0016] The purpose of the reinforcing portion may be to increase the wear resistance of the transport pipe section against internal wear. In the embodiment of Fig. 1, the reinforcing portion 8 in the first pipe section 2 is a pipe section forming the inner surface 9 of the first pipe section 2. On the outer surface 11 of the reinforcing portion 8 there is a plastic material section, the outer surface of which forms the outer surface 14 of the first pipe section 2. The first and / or second transport pipe section can also be formed without a special reinforcing portion.

[0017] In figure 1 the first transport pipe section is connected to a connecting piece 1, which in the embodiment of figure 1 may be of plastic material. The inner surface of the wall of the connecting piece 1 may form the wall of the flow channel 5.

[0018] In the transport pipe of FIG. 1, the first transport pipe section 20 and the second transport pipe section 21 are thus connected to each other by the connection piece 1 and the connection sleeve section 22. According to the embodiment of FIG. 1 (and FIG. 4), the inner surface of the first transport pipe section 20 and the inner surface of the connection piece 1 are arranged substantially in a straight line, so that no step is formed at the connection point, which would hinder the transport of material. Correspondingly, the inner surfaces of the second transport pipe section 21 and the connection piece 1 are arranged substantially in a straight line, so that no step is formed at the connection point, which would hinder the transport of material. The outer surfaces of the first transport pipe section 20 and the first connection area 7 are arranged substantially in a straight line in the connection area, so that a connection can be formed between the connection sleeve section 22, the plastic material part of the first transport pipe section 20 and the plastic material of the wall of the first connection area 7 of the connection piece 1. Correspondingly, the outer surface of the second transport pipe section 21 and the second connection area 8 are arranged in a substantially straight line in the connection area, so that a connection can be made between the connection sleeve section 22, the plastic material section of the second transport pipe section 21 and the plastic material of the wall of the second connection area 8 of the connection piece 1. The transport pipe sections 20, 21 and the connection piece 1 can be connected to each other by so-called electric welding. By heating an electric resistance 43 arranged in the transport pipe section 20 or in the connection sleeve section 22, the connection between the first transport pipe section 20 and the connection sleeve section 22 and the connection between the connection piece 1 and the connection sleeve section 22 are made. Correspondingly, by heating an electric resistance 43 arranged in the other connection sleeve section 22, the connection between the second transport pipe section 21 and the connection sleeve section 22 and the connection between the connection piece 1 and the connection sleeve section 22 are made.

[0019] In the embodiment of FIG. 1, the connection piece 1 may be bent upwards by an angle (α) from the horizontal plane. According to an embodiment, the connection piece 1 is configured to be bent in a vertical plane by an angle (α). According to an embodiment, the angle (α) is between 0 degrees and 20 degrees. According to an embodiment, the angle (α) is smaller in the vertical plane when bent upwards from the horizontal plane than when bent downwards from the horizontal plane. According to an embodiment, the angle (α) when bent upwards is 0.5 times the angle (α) when bent downwards. According to an embodiment, the angle (α) when bent upwards is between 0 degrees and 10 degrees. According to an embodiment, the angle (α) when bent upwards is between 0 degrees and 8 degrees. According to an embodiment, the angle (α) when bent downwards is between 0 degrees and 20 degrees (FIG. 2). According to an embodiment, the angle (α) when bent downwards from the horizontal plane is between 0 degrees and 16 degrees.

[0020] 3 shows an embodiment of the transportation pipeline, where the connection piece is configured to be bent in a horizontal plane (laterally) by an angle (β), the angle (β) being between 0 degrees and 20 degrees from the vertical. According to an embodiment, the angle (β) may be between 0 degrees and 16 degrees laterally relative to the vertical.

[0021] According to one embodiment, the length of the connection piece 1 and the angle change (α) and / or (β) between the first transport pipe section 20 and the second transport pipe section 21 can be set depending on the size and / or speed of the transported material M. According to one embodiment, the material M can move in the transport pipe section with the pneumatic transport of the pneumatic material transport system from the first transport pipe section 20 to the second transport pipe section 21 without substantially abrasive contact with the connection piece 1.

[0022] The reinforcing section is according to one embodiment a tube section, preferably a metal tube, most preferably a steel tube.

[0023] The wall thickness of the reinforcement portion is less than the wall thickness of the plastic material portion. According to one embodiment, the thickness of the reinforcement portion is approximately less than 1 / 2, preferably 1 / 20 to 1 / 4, of the total wall thickness of the tube portion.

[0024] The wall thickness of the tube portion is in one embodiment about 20mm to 40mm. The wall thickness of the tube portion may be less or more. The wall thickness of the tube portion may vary depending on the application.

[0025] According to one embodiment, the plastic material layer is a tube section separate from the reinforcement section, whereby the reinforcement section may be arranged in the flow passage space bounded by the plastic material layer / plastic material tube. In this way, the tubular layer, the plastic material layer and the reinforcement section are arranged one by one.

[0026] According to one embodiment, the transport pipe section may be fixed by bonding the plastic material pipe section and the reinforcement section, for example by baking. Other suitable manufacturing methods are also applicable. The plastic material layer may be formed around the reinforcement section, for example by extrusion.

[0027] The plastic material part may comprise a wear-resistant material, so that if at some point the reinforcement part wears away, it is not a problem since the plastic material part has sufficient wear resistance, but the mechanical shape strength of the tube part is maintained.

[0028] According to an embodiment, the transport pipe section may be bent, for example at or close to the installation site. In bending, a main axis may be used in the flow path of the pipe section to prevent buckling of the walls of the pipe section. According to an embodiment, the transport pipe section or the connection piece 1 does not buckle, just like a simple plastic pipe. The reinforcement section prevents, for example, deformation of the pipe section after bending (e.g. returning to the shape before bending).

[0029] The reinforcement portion may be subjected to mechanical stresses of the pipe.

[0030] The reinforced portion may have a wall thickness smaller than that of the steel pipe used alone as the transport pipe. According to one embodiment, the wall thickness of the reinforced portion may be, for example, 2 mm to 6 mm. According to one embodiment, the wall strength of the plastic material pipe may be, for example, 10 mm to 30 mm.

[0031] According to an embodiment, the connection piece 1 may comprise a tubular envelope 2 having a first end 3 and a second end 4. The connection piece may comprise a flow passage 5 between the first end 3 and the second end 4, the flow passage 5 being defined by an inner surface 6 of the envelope of the connection piece. The connection piece may comprise a first connection area 7 extending away from the first end 3. The connection piece may comprise a second connection area 8 extending away from the second end 4. Restricting elements 9, 10 for limiting the bending of the connection piece may be formed on the connection piece. One connection piece 1 is shown in FIG. 5. The connection piece 1 may be formed with a thin wall at least partially in its intermediate area, i.e. in the area between the first connection area 7 and the second connection area 8. This allows the connection piece 1 to be configured in such a way that it is easier to bend. The connecting piece may be configured to bend at an angle (α) between 0 and 20 degrees to a first plane, such as a vertical plane, and / or may be configured to bend at an angle (β) between 0 and 20 degrees to a second plane, such as a horizontal plane.

[0032] The connecting piece may be configured to bend at an angle (α) in a vertical plane passing through the longitudinal axis and / or at an angle (β) in a horizontal plane passing through the longitudinal axis. According to one embodiment, the angle (α) is between 0 degrees and 20 degrees. According to one embodiment, the angle (β) is between 0 degrees and 20 degrees.

[0033] The connecting piece (1) is formed with portions 9 protruding from the outer surface of the connecting piece's envelope 6 and / or recesses 10 and protrusions (9) therebetween. The recesses 10 may have a base 10'. The protrusions / recesses may have side surfaces 12, 13. The connecting piece may be tubular and have an outer surface 11 and an inner surface 6. The flow passages 5 may be formed within (around) the outer periphery of the inner surface 6 of the connecting piece 1 (Figure 6).

[0034] According to an embodiment, the protruding portion 9 and / or the recess 10 may comprise a portion in a direction transverse to the longitudinal direction of the connecting piece. According to an embodiment, adjacent protruding portions 9 and / or recesses 10 may be arranged at a distance from each other. The protruding portion 9 and / or the recess 10 may comprise an annular portion. The protruding portion 9 and / or the recess 10 may comprise segments. The protruding portions or segments may be arranged distributed along the circumference of the connecting piece 1.

[0035] The portions 9, 10 that limit the bending of the connection piece 1 may be arranged, for example, to limit the bending of the connection piece between 0 degrees and 20 degrees with respect to the longitudinal axis. The longitudinal axis may be configured in the incoming direction of the material transport pipe section.

[0036] The distance between adjacent protruding portions 9 and / or recesses 10 may be set such that in the bent position, the side surfaces 12, 13 of adjacent protruding portions and / or recesses limit the degree of bending of the connecting piece. According to an embodiment, the distance between adjacent protruding portions 9 and / or recesses 10 may be set such that in the bent position, the side surfaces of adjacent protruding portions and / or recesses limit the degree of bending of the connecting piece when the walls 12, 13 of the protruding portions and / or recesses are in contact with each other. According to an embodiment, the wall thickness of the connecting piece 1 may be smaller in the part comprising the protruding portions 9 and / or recesses 10 than in the first and / or second connection area 7, 8 of the connecting piece. According to an embodiment, the wall thickness of the connecting piece may be smaller in the area between the first or second connection area than in the area between the first or second connection area.

[0037] According to one embodiment, the portion having the protruding portion 9 and / or the recess 10 may be arranged in a portion between the first connection area 7 and the second connection area 8 of the connection piece 1, for example in an intermediate portion of the connection piece.

[0038] According to one embodiment, the connecting piece 1 may be arranged to allow an angular change in a first longitudinal plane (e.g. a vertical plane) of a different magnitude than in a longitudinal plane that intersects it (e.g. a horizontal plane).

[0039] According to one embodiment, limiting members allowing different degrees of bending may be formed in different regions of the circumference of the connecting piece 1 .

[0040] According to an embodiment, the limiting member that allows bending at different angles may have different dimensions or shapes in different regions. According to an embodiment, the limiting member that allows bending at different angles may have different dimensions or shapes in the plane of the respective regions to allow bending at different angles. According to an embodiment, the protruding and / or recessed portions may be different in different regions of the periphery, thereby allowing different angles of bending.

[0041] In one embodiment, the connecting piece 1 may be arranged in a vertical plane to allow different angular changes when bent upward from the horizontal plane than when bent downward from the horizontal or inflow direction plane.

[0042] According to one embodiment, the connecting piece 1 is arranged such that the angular change upward from the horizontal plane or the plane of the material inflow direction is smaller than the angular change downward from the horizontal plane or the plane of the material inflow direction.

[0043] According to one embodiment, the connection piece 1 may be arranged so that it can be bent upwards between 0 degrees and 10 degrees from the horizontal or inflow direction plane.

[0044] According to one embodiment, the connection piece 1 may be arranged so that it can be bent downwards between 0 degrees and 20 degrees from the horizontal or inflow direction plane.

[0045] According to one embodiment, the connecting piece 1 is arranged such that the angular change downwards from the horizontal plane or the plane of the material inflow direction is smaller than the angular change upwards from the horizontal plane or the plane of the material inflow direction.

[0046] According to one embodiment, during the step of forming the piping connection, the connection piece 1 can be rotated so that it can be bent in a desired bending plane within a desired angle range.

[0047] According to an embodiment, the length of the connection piece 1 and the angle change (α) and / or (β) between the first transport pipe section 20 and the second transport pipe section 21 may be set depending on the size and / or speed of the transported material M. According to an embodiment, the material M can move in the transport pipe section with the pneumatic transport of the pneumatic material transport system from the first transport pipe section 20 to the second transport pipe section 21 without substantially abrasive contact with the connection piece 1.

[0048] According to one embodiment, the transport piping of the pneumatic material transport system comprises a first transport pipe section 20, a second transport pipe section 21, and a connection piece 1 between the first transport pipe section 20 and the second transport pipe section 21, which may be the connection piece described above or below. The connection piece 1 may be connected from its first end 3 to the first transport pipe section 20 and from its second end 4 to the second transport pipe section 21.

[0049] According to one embodiment, in the transport piping, a connection sleeve portion 22 is configured to be used in connecting the first transport pipe portion 20 and / or the second transport pipe portion 21 to the connection piece 1, and the connection sleeve portion may be arranged to include a connection area between the first transport pipe portion 20 and / or the second transport pipe portion 21 and the connection piece 1 arranged within the connection sleeve portion 22.

[0050] According to one embodiment, the connection sleeve portion 22 may be configured as a welded sleeve, equipped with heating means such as a resistor 43 .

[0051] According to an embodiment, the connecting piece 1 may comprise or be made of a plastic material or metal.

[0052] According to an embodiment, the first transport pipe section 20 and / or the second transport pipe section 21 may be a composite steel pipe or a composite pipe. According to an embodiment, the composite may be a plastic material. According to an embodiment, the plastic material may be, for example, polyethylene, for example PE100. According to an embodiment, the steel pipe may be a structural steel, for example type S235. According to an embodiment, the steel pipe may be painted on its outside and inside.

[0053] According to one embodiment, the invention may relate to a method for forming a transport pipe of a pneumatic material transport system. The transport pipe comprises at least one first transport pipe section 20, at least one second transport pipe section 21, a connection sleeve section 22 and optionally a connection piece 1 between the first transport pipe section 20 and the second transport pipe section 21. In this method, the first transport pipe section 21 may be connected to the second pipe section directly or via the connection piece 1 by inserting the ends of the pipe sections 21, 21 to be connected to each other into the connection sleeve section 22 (i.e. a connection sleeve) and forming a thermoplastic connection with the pipe sections 20, 21 and the connection sleeve section 22 and / or, optionally, the connection piece 1 and the connection sleeve section 22.

[0054] According to one embodiment, in a transport piping, a connecting piece (1) arranged between a first transport piping section (20) and a second transport pipe section (21) may be bent at an angle (α) to a first plane, such as a vertical plane, and / or at an angle (β) to a second plane, such as a horizontal plane, to change the direction of the flow path of the transport pipe section.

[0055] According to an embodiment, the angle (α) is between 0 degrees and 20 degrees. According to an embodiment, the angle (α) may be up to 8 degrees above the inflow plane. According to an embodiment, the angle (α) may be up to 7.5 degrees above the inflow plane. According to an embodiment, the angle (α) may be up to 16 degrees below the inflow plane. According to an embodiment, the angle (α) may be up to 15 degrees below.

[0056] According to one embodiment, the angle (β) may be between 0 degrees and 20 degrees. According to one embodiment, the angle (β) is at most 17 degrees relative to the perpendicular to the inflow direction. According to one embodiment, the angle (β) is at most 15 degrees laterally from the perpendicular to the inflow direction.

[0057] According to one embodiment, the flow path direction is changed upwards by up to 10 degrees, preferably up to 8 degrees, from the inflow direction, or downwards by up to 20 degrees, preferably up to 17 degrees, from the inflow direction.

[0058] According to one embodiment, the flow path is redirected transversely to the inflow direction by up to 20 degrees, preferably up to 17 degrees.

[0059] According to one embodiment, to form the transport pipe section, the plastic material pipe 25, 27 is placed on the stiffening pipe 26, 28 by heating the plastic material pipe 25, 27 or on the stiffening pipe in the flow space of the plastic material pipe, and at least one of the transport pipe sections 20, 21 is formed by moving the plastic material pipe and / or the stiffening pipe relatively, the inner surface 30 being the inner surface of the stiffening pipe and the outer surface 33 being the outer surface of the plastic material pipe. According to one embodiment, the outer surface 31 of the stiffening pipe (inner pipe) may be placed against the inner surface 32 of the plastic material pipe (outer pipe).

[0060] The transport pipes, connectors and methods of the present invention are particularly suitable for use in connecting transport pipes in pneumatic waste pipe transport systems. The pipe sizes are fairly large, typically between 200mm and 500mm in diameter, for example.

Claims

1. A connecting piece (1) for pipe connection, comprising: A tubular envelope (2) having a first end (3) and a second end (4); A flow path (5) defined by the inner surface (6) of the envelope of the connecting piece and disposed between the first end (3) and the second end (4); A first connection area (7) extending at a distance from the first end (3); A second connection area (8) extending at a distance from the second end (4); and The connecting piece is configured to bend at an angle (α) of 0 to 20 degrees with respect to a first plane such as a vertical plane, and / or is configured to bend at an angle (β) of 0 to 20 degrees with respect to a second plane such as a horizontal plane.

2. The connecting piece (1) according to claim 1, wherein a protruding portion (9) protruding from the outer surface of the envelope (6) of the connecting piece and / or a recess (10) and a protruding portion (9) therebetween are formed.

3. The connecting piece according to claim 2, wherein the protruding portion (9) and / or the recess (10) comprise portions in a direction intersecting the longitudinal direction of the connecting piece.

4. The connecting piece according to claim 2 or 3, wherein adjacent protruding portions (9) and / or recesses (10) are spaced apart from each other.

5. The connecting piece according to claim 2 or 3, wherein the protruding portion (9) and / or the recess (10) comprise an annular portion.

6. The connecting piece according to claim 2 or 3, wherein the protruding portion (9) and / or the recess (10) comprise segments arranged to be distributed along the outer periphery of the connecting piece (1).

7. The limiting member (9, 10) for limiting the bending of the connecting piece is formed on the connecting piece at the outer surface (11) of the envelope (6), and the limiting member is arranged such that the bending of the connecting piece is limited, for example, between 0 and 20 degrees with respect to the longitudinal axis. The connecting piece according to any one of claims 1 to 3.

8. The distance between adjacent protruding portions (9) and / or recesses (10) is set such that when the walls (12, 13) of the protruding portions (9) and / or recesses (10) are in contact with each other, the sides (12, 13) of the adjacent protruding portions and / or recesses limit the degree of bending of the connecting piece at the bending position. The connecting piece according to claim 2 or 3.

9. The thickness of the wall of the connecting piece (1) is such that the part having the protruding part (9) and / or the recessed part (10) is smaller than the first and / or second connecting areas (7, 8) of the connecting piece. The connecting piece according to claim 8.

10. The part having the protruding part (9) and / or the recessed part (10) is arranged in the part between the first connecting area (7) and the second connecting area (8) of the connecting piece (1), for example, in the middle part of the connecting piece. The connecting piece according to claim 2 or 3.

11. The connecting piece (1) is arranged so as to allow an angular change of a size different from that of a longitudinal plane orthogonal thereto, such as a horizontal plane, in a first longitudinal plane, such as a vertical plane. The connecting piece according to claim 2 or 3.

12. Limiting members that enable different degrees of bending are formed in different regions of the outer periphery of the connecting piece (1). The connecting piece according to any one of claims 1 to 3.

13. The connecting piece (1) is arranged so as to allow angular changes of different sizes when bent upward from a horizontal plane and when bent downward from a horizontal plane in a vertical plane. The connecting piece according to any one of claims 1 to 3.

14. The connecting piece (1) is arranged such that the angular change upward from a horizontal plane or a plane in the material inflow direction is smaller than the angular change downward from a horizontal plane or a plane in the material inflow direction. The connecting piece according to any one of claims 1 to 3.

15. The connecting piece (1) is arranged so as to be bent upward between 0 degrees and 10 degrees from a horizontal plane or a plane in the material inflow direction. The connecting piece according to any one of claims 1 to 3.

16. The connecting piece (1) is arranged so as to be bent downward between 0 degrees and 20 degrees from a horizontal plane or a plane in the material inflow direction. The connecting piece according to any one of claims 1 to 3.

17. The connecting piece (1) is arranged such that the angular change upward from a horizontal plane or a plane in the material inflow direction is smaller than the angular change downward from a horizontal plane or a plane in the material inflow direction. The connecting piece according to any one of claims 1 to 3.

18. In the step of forming a pipe connection, by rotating the connecting piece (1), the connecting piece can be bent to a desired bending plane within a desired angular range. The connecting piece according to any one of claims 1 to 3.

19. The length of the connecting piece (1) and the change in angle between the first transport pipe section (20) and the second transport pipe section (21) are determined according to the size and / or speed of the transport material (M), whereby the transport material (M) moves through the transport pipe section of the material transport pipe of the pneumatic material transport system together with the transport air flow from the first transport pipe section (20) to the second transport pipe section (21) without substantially abrasively contacting the connecting piece (1). The connecting piece according to any one of claims 1 to 3.

20. A transport pipe of a pneumatic material transport system, a first transport pipe section (20), a second transport pipe section (21), and a connecting piece (1) between the first transport pipe section (20) and the second transport pipe section (21). The connecting piece is connected to the first transport pipe section (20) from its first end (3) and connected to the second transport pipe section (21) from its second end (4). The transport pipe which is the connecting piece according to any one of claims 1 to 3.

21. At the connection location between the first transport pipe section (20) and / or the second transport pipe section (21) and the connecting piece (1), a connection sleeve portion (22) is arranged to be used. The connection sleeve portion (22) is arranged to include the connection area between the first transport pipe section (20) and / or the second transport pipe section (21) and the connecting piece (1) arranged within the connection sleeve portion (22). The transport pipe according to claim 20.

22. The connection sleeve portion (22) is configured as a welding sleeve provided with heating means such as a resistor (43). The transport pipe according to claim 21.

23. The connecting piece (1) comprises a plastic material or metal, or is formed from plastic or metal. The transport pipe according to claim 20.

24. The first transport pipe section (20) and / or the second transport pipe section (21) is a composite steel pipe or a composite pipe. The transport pipe according to claim 20.

25. A method of forming a transport pipe of a pneumatic material transport system, wherein the transport pipe comprises at least one first transport pipe section (20), at least one second transport pipe section (21), a connection sleeve (22), and optionally a connecting piece (1) between the first transport pipe section (20) and the second transport pipe section (21). A method of connecting a first transport pipe section (21) directly to a second pipe section or via the connection piece by inserting the ends of pipe sections (21, 21, 1) connected to each other into a connection sleeve (22) and forming a thermoplastic connection with the pipe sections (20, 21) and the connection sleeve (22), and / or optionally, the connection piece (1) and the connection sleeve (22).

26. In the transport pipe, the connection piece (1) disposed between the first transport pipe section (20) and the second transport pipe section (21) is bent by an angle (α) in a first plane such as a vertical plane and / or by an angle (β) in a second plane such as a horizontal plane to change the direction of the flow path of the transport pipe section, according to the method of claim 25.

27. The method according to claim 26, wherein the angle (α) is from 0 degrees to 20 degrees.

28. The method according to claim 26 or 27, wherein the angle (β) is from 0 degrees to 20 degrees.

29. The method according to claim 26 or 27, wherein the direction of the flow path is changed by up to 10 degrees, preferably up to 8 degrees, upward from the inflow direction, or by up to 20 degrees, preferably up to 17 degrees, downward from the inflow direction.

30. The method according to claim 26 or 27, wherein the direction of the flow path is changed by up to 20 degrees, preferably up to 17 degrees, laterally from the inflow direction.

31. To form a transport pipe section, a plastic material pipe (26, 28) is heated and placed on a reinforcing pipe (25, 27) or on the reinforcing pipe within the flow path space of the plastic material pipe, and at least one of the transport pipe sections (20, 21) is formed by relatively moving the plastic material pipe and / or the reinforcing pipe. The inner surface of the transport pipe section is the inner surface of the reinforcing pipe, and the outer surface of the transport pipe section is the outer surface of the plastic material pipe, according to the method of claim 26 or 27.

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