CN108468887B - Reducing pipeline connecting device and method - Google Patents
Reducing pipeline connecting device and method Download PDFInfo
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- CN108468887B CN108468887B CN201810685652.1A CN201810685652A CN108468887B CN 108468887 B CN108468887 B CN 108468887B CN 201810685652 A CN201810685652 A CN 201810685652A CN 108468887 B CN108468887 B CN 108468887B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/02—Flanged joints the flanges being connected by members tensioned axially
Abstract
Different diameter pipe connection device, including the unequal flange joint spare of thick liquid pipe and thick liquid pipe internal diameter, its characterized in that still includes that one end has turn-ups toper turn-ups pipe, the loose cover flange and the connecting bolt the same with flange joint spare flange standard, toper turn-ups pipe do not have turn-ups one end and the internal diameter of thick liquid pipe equal, and with thick liquid pipe coaxial fixation, the one end that has the turn-ups equals with the flange joint spare internal diameter, loose cover flange cover is on toper turn-ups pipe to lean on the cooperation with the turn-ups of toper turn-ups pipe, loose cover flange and flange joint spare pass through connecting bolt and connect. The smooth transition between the different-diameter pipelines avoids the phenomenon of slurry hanging, realizes the detachable connection of the slurry pipe and the flange connecting piece, is quite convenient to connect and detach, improves the axial alignment degree of the connecting part of the different-diameter pipelines, avoids the phenomenon of misalignment from influencing the flowing efficiency of the slurry, and improves the flowing stability of the slurry at the connecting part of the different-diameter pipelines and the connection reliability of the different-diameter pipelines. The invention also provides a connecting method of the reducing pipeline.
Description
Technical Field
The invention relates to a connecting device for reducing pipelines, which is used for detachable connection between the reducing pipelines and also relates to a connecting method for the reducing pipelines.
Background
The special paper pulp making pipe is connected with the reducing pipe between the equipment, the instrument or the valve, and the reducing connection can be achieved by adopting a mechanical joint for connecting flanges by bolts or adopting two groove type standard clamps with different diameters and a groove type reducing pipe with a large end and a small end.
The detected related art:
1. CN 101932866 a, loose flange type horn tube joint, having: the angle theta of the end face of the horn-shaped part relative to the central axis of the steel pipe is 87-89 degrees.
2. CN 202360951U, a reducing pipeline attach fitting for connecting the different pipeline of two diameters, it includes the clamp and establishes the joint strip at the clamp inboard, the internal diameter at clamp both ends is different, and the both ends internal diameter of clamp suits with the pipeline external diameter that corresponds continuous respectively, the diameter at joint strip both ends is corresponding with the pipeline external diameter that corresponds respectively.
3. CN 204647621U discloses reducing pipeline flange connection structure, including locating the cab apron of crossing between little pipeline flange and the big pipeline flange, the center that passes the cab apron terminal surface that corresponds little pipeline flange sets up the small-bore hole, and the center that passes the cab apron terminal surface that corresponds big pipeline flange sets up the large-bore hole, big, small-bore hole communicates with each other in crossing the cab apron, little pipeline flange passes through sealed packing with relative cab apron terminal surface and is connected and fasten with the screw nut subassembly of circumference equipartition, big pipeline flange passes through sealed packing with relative cab apron terminal surface and connects and fasten with the screw nut subassembly of circumference equipartition.
The prior art of the reducing pipe connection has the following defects:
1. two reducing pipes are not radially positioned, so that axial misalignment is caused, a misalignment phenomenon is caused, a step is generated at the joint of the reducing pipes, the circulation efficiency of slurry at the joint is influenced, slurry is easily formed and suspended, and the slurry is retained.
2. The transition of the joint of the reducing pipe is not smooth, and the slurry passing efficiency and the appearance quality are influenced.
3. The flange is directly welded with the reducing pipe, and cannot be detached, and the difficulty in installation and maintenance of the joint of the reducing pipe is high.
Disclosure of Invention
According to the reducing pipeline connecting device and the reducing pipeline connecting method, provided by the invention, the reducing pipelines are smoothly transited to avoid the phenomenon of slurry hanging, the requirements of stable pressure of special paper pulp liquid and no slurry hanging between connecting pieces are met, the detachable connection of the slurry pipe and the flange connecting piece is realized, the connection and the detachment are quite convenient, the reducing pipelines are easy to install and maintain, the axial alignment degree of the connecting part of the reducing pipelines is improved, the phenomenon of misalignment is prevented from influencing the slurry flowing efficiency, and the reliability of the reducing pipeline connection is improved.
In order to achieve the purpose, the technical scheme of the invention is as follows:
different diameter pipe connection device, including the unequal flange joint spare of thick liquid pipe and thick liquid pipe internal diameter, its characterized in that still includes that one end has turn-ups toper turn-ups pipe, the loose cover flange and the connecting bolt the same with flange joint spare flange standard, toper turn-ups pipe do not have turn-ups one end and the internal diameter of thick liquid pipe equal, and with thick liquid pipe coaxial fixation, the one end that has the turn-ups equals with the flange joint spare internal diameter, loose cover flange cover is on toper turn-ups pipe to lean on the cooperation with the turn-ups of toper turn-ups pipe, loose cover flange and flange joint spare pass through connecting bolt and connect.
Preferably, the surface of the loose flange, which is abutted against the flange of the tapered flanging pipe, is provided with an annular positioning sinking groove corresponding to the flange of the tapered flanging pipe, and the flange of the tapered flanging pipe is embedded into the annular positioning sinking groove and is in positioning fit with the annular positioning sinking groove along the radial direction.
Preferably, the conical flanging pipe consists of a conical barrel and a flanging barrel, the cross section of the flanging barrel is a right angle and is coaxially connected with the conical barrel, one end of the conical barrel is coaxially fixed with the pulp pipe, the inner diameter of the conical barrel is equal to the inner diameter of the pulp pipe, the inner diameter of the other end of the conical barrel is equal to the inner diameter of the flanging barrel, the inner diameter of the flanging barrel is equal to the inner diameter of the flange connecting piece, and the loose flange is abutted against the flanging barrel for matching.
Preferably, the flanging barrel comprises an axial ring which is coaxially connected with the conical barrel, and a radial flanging which is perpendicular to the axial ring and is turned out in the radial direction, wherein the axial ring and the radial flanging are in round corner transition, and the radial flanging is abutted with the loose flange.
Preferably, a sealing gasket is clamped between the conical flanging pipe and the flange connecting piece, the inner diameter of the sealing gasket is larger than that of the flange connecting piece, and the axial thickness of the sealing gasket is not smaller than mm.
Preferably, the axial thickness of the loose flange is smaller than that of the flanging barrel.
Preferably, the wall thickness of the conical flanging pipe is the same as that of the pulp pipe, the conical flanging pipe is welded with the pulp pipe through a V-shaped groove, and the inner diameter of the loose flange is larger than the outer diameter of the pulp pipe.
The method for connecting the different-diameter pipelines is characterized in that a loose flange is sleeved on a pulp pipe, one end of the pulp pipe, which has the same inner diameter as the tapered flanging pipe, is coaxially fixed, the loose flange is moved onto the tapered flanging pipe and is abutted against the flanging of the tapered flanging pipe, and a connecting bolt is used for fastening and connecting a flange connecting piece and the loose flange, so that the pulp pipe and the flange connecting piece are connected.
Preferably, the step of coaxially fixing the end, with the same inner diameter, of the pulp pipe and the tapered flanging pipe refers to the step of conducting chamfering treatment on the end faces, connected with the pulp pipe and the tapered flanging pipe, respectively, so that after the pulp pipe and the tapered flanging pipe are coaxially aligned and contacted, a V-shaped groove is formed between the end faces, connected with the pulp pipe and the tapered flanging pipe, and then the V-shaped groove is filled through welding, so that the pulp pipe and the tapered flanging pipe are coaxially fixed.
Preferably, the manufacturing process of the tapered flanging pipe is as follows: the method comprises the steps of firstly selecting a flanging cylinder with the axial thickness larger than that of a loose flange and the wall thickness equal to that of a slurry pipe, selecting a conical cylinder with the wall thickness equal to that of the slurry pipe, then respectively conducting angle guiding treatment on the end face connected with the flanging cylinder and the conical cylinder, then coaxially aligning the flanging cylinder and the conical cylinder, conducting groove welding, and finally polishing the welding position of the flanging cylinder and the conical cylinder to enable the flanging cylinder and the conical cylinder to be in smooth transition.
The invention has the beneficial effects that:
1. the slurry pipe is fixedly connected with the tapered flanging pipe, and the tapered structure of the tapered flanging pipe is used for transition between the slurry pipe and the flange connecting piece, so that the inner diameters of the slurry pipes with different inner diameters and the flange connecting piece are changed smoothly, the smooth flowing of slurry is facilitated, the flow speed and pressure of the slurry are stabilized, and the flowing stability of the slurry at the joint of the reducing pipelines is improved.
2. The pulp pipe and the flange connecting piece are transited through the tapered flanging pipe, the reducing pipeline is connected without forming steps and is transited smoothly, the pulp hanging phenomenon is avoided, and the requirement that the pressure of special pulp liquid is stable and the pulp does not hang between the connecting pieces is met.
3. The turnup through the toper turn-ups pipe supports and leans on loose sleeve flange and flange joint's bolted connection, realizes being connected with dismantling of flange joint spare to the thick liquid pipe, connects and dismantles all fairly conveniently, easily the installation and the maintenance of reducing pipeline.
4. Set up the annular location heavy groove corresponding with the turn-ups of toper turn-ups pipe on the loose flange, carry out radial positioning to toper turn-ups pipe through annular location heavy groove, improve the axial alignment degree of reducing pipeline junction, the centering degree of thick liquid pipe and flange connecting piece is higher, avoids the misalignment phenomenon to influence the thick liquid efficiency of flowing through.
5. The loose flange is sleeved outside the tapered flanging pipe and is not in direct contact with the liquid of the slurry pipe, so that the slurry is prevented from corroding the loose flange, and the sealing washer is used for sealing between the tapered flanging pipe and the flange connecting piece, so that the slurry can be prevented from being polluted by external impurities, the slurry is effectively prevented from leaking, and the connection reliability of the reducing pipeline is improved.
Drawings
Fig. 1 is a schematic structural diagram of a reducing pipe connection device according to an embodiment.
Fig. 2 is a schematic structural view of a tapered flanged pipe.
Fig. 3 is a schematic structural view of the loose flange.
FIG. 4 is a schematic structural view of the loose flange and the tapered flanged pipe in abutting fit.
Detailed Description
The invention will now be further described by way of the accompanying figures 1 to 4 and examples.
Reducing pipe connection device, including the unequal flange joint spare 2 of thick liquid pipe 1 and thick liquid pipe 1 internal diameter, its characterized in that still includes that one end has turn-ups toper turn-ups pipe 3, the same loose cover flange 4 and connecting bolt 5 of flange joint spare 2 flange standard, toper turn-ups pipe 3 do not have turn-ups one end and equals with the internal diameter of thick liquid pipe 1, and with thick liquid pipe 1 coaxial fastening, the one end that has the turn-ups equals with flange joint spare 2 internal diameters, loose cover flange 4 overlaps on toper turn-ups pipe 3 to lean on the cooperation with the turn-ups of toper turn-ups pipe 3, loose cover flange 4 and flange joint spare 2 pass through connecting bolt 5 and connect.
As shown in the figure, the pulp pipe 1 is fixedly connected with the conical flanging pipe 3, and the conical structure of the conical flanging pipe 3 is used for transition between the pulp pipe 1 and the flange connecting piece 2, so that the inner diameters of the pulp pipes with different inner diameters and the flange connecting piece are smoothly changed, the smooth flowing of pulp is facilitated, the flow speed and the pressure of the pulp are stabilized, and the pulp flowing stability of the joint of the reducing pipelines is improved. The reducing pipeline is connected without steps, and has smooth transition, thereby avoiding the phenomenon of slurry hanging and meeting the requirement of stable pressure of special paper pulp liquid and no slurry hanging between connecting pieces. The turnup through toper turn-ups pipe 3 supports and leans on loose sleeve flange 4 and flange joint spare 2's bolted connection, realizes being connected dismantling of thick liquid pipe and flange joint spare, and it is all fairly convenient to connect and dismantle, easily the installation and the maintenance of reducing pipeline.
The surface of the loose flange 4, which is abutted against the flange of the tapered flanging pipe 3, is provided with an annular positioning sinking groove 41 corresponding to the flange of the tapered flanging pipe 3, and the flange of the tapered flanging pipe 3 is embedded into the annular positioning sinking groove 41 and is in positioning fit with the annular positioning sinking groove 41 along the radial direction. The conical flanging pipe 3 is radially positioned through the annular positioning sinking groove 41, the axial alignment degree of the joint of the reducing pipes is improved, the alignment degree of the slurry pipe and the flange connecting piece is higher, and the slurry flowing efficiency is prevented from being influenced by the misalignment phenomenon.
The cone-shaped flanging pipe 3 is composed of a cone-shaped cylinder 31 and a flanging cylinder 32, wherein the cross section of the flanging cylinder is a right angle and is coaxially connected with the cone-shaped cylinder 31, one end of the cone-shaped cylinder 31 is coaxially fixed with the pulp pipe 1, the inner diameter DN1 is equal to the inner diameter of the pulp pipe 1, the inner diameter DN2 of the other end is equal to the inner diameter of the flanging cylinder 32, the inner diameter of the flanging cylinder 32 is equal to the inner diameter of the flange connecting piece 2, and the loose flange 4 is abutted to the flanging cylinder 32 for matching. A toper section of thick bamboo 31 is used for the mild transition of internal diameter between thick liquid pipe 1 and the flange joint spare 2, and a turn-ups section of thick bamboo 32 is used for leaning on loose sleeve flange 4, fixes a position loose sleeve flange 4, and later rethread loose sleeve flange 4 is connected with flange joint spare 2, can realize thick liquid pipe 1 and flange joint spare 2 be connected.
The flanging cylinder 32 comprises an axial ring 32.1 coaxially connected with the conical cylinder 31 and a radial flanging 32.2 which is perpendicular to the axial ring 32.1 and is turned out along the radial direction, the axial ring 32.1 and the radial flanging 32.2 are in transition through a fillet, and the radial flanging 32.2 is abutted to the loose flange 4 in a fitting manner. As can be seen from fig. 1 and 4, the loose flange 4 abuts against the radial flange 32.2, the radial flange 32.2 is embedded into the annular positioning sinking groove 41 on the loose flange 4, the annular positioning sinking groove 41 radially positions the flanging barrel 32, in order to ensure the positioning accuracy, the radial flange 32.2 and the annular positioning sinking groove 41 are in small clearance fit, the outer diameter D of the annular positioning sinking groove 41 is smaller than the outer diameter D1-2 mm of the radial flange, and the depth h of the annular positioning sinking groove 41 is not smaller than 1.5 mm, so as to ensure that the annular positioning sinking groove 41 effectively positions the radial flange 32.2.
Wherein, the conical flanging pipe 3 and the flange connecting piece 2 are clamped with a sealing gasket 6, the inner diameter of the sealing gasket 6 is more than 10 millimeters larger than that of the flange connecting piece 2, and the axial thickness of the sealing gasket 6 is not less than 5 mm. The sealing washer 6 is used for sealing between the conical flanging pipe 3 and the flange connecting piece 2, the pollution of external impurities to slurry can be avoided, and the slurry is effectively prevented from leaking, so that the reliability of the connection of the reducing pipelines is improved, in addition, the inner diameter of the sealing washer 6 is larger than that of the flange connecting piece 2 by more than 10 millimeters, the step for blocking the slurry flow can be avoided being formed between the conical flanging pipe 3 and the flange connecting piece 2 due to the arrangement of the sealing washer 6, the sealing washer is guaranteed to only play a sealing role, and the influence on the slurry flow is avoided.
The axial thickness E of the loose flange 4 is smaller than the axial thickness L of the flanging cylinder 32. Because the pulp pipe 1 is coaxially connected with the tapered flanging pipe 3, the loose flange 4 is tightly connected with the flange connecting piece 2 through the connecting bolt 5, the loose flange 4 is close to the flange connecting piece 2 through the fastening force of the connecting bolt 4, if the thickness of the loose flange 4 is too large, the fastening force is larger, namely the axial tension on the tapered flanging pipe 3 is larger, the connection strength between the tapered flanging pipe 3 and the pulp pipe 1 is influenced, in the using process, the crack is easily caused at the joint of the tapered flanging pipe 3 and the pulp pipe 1, the different-diameter connecting pipeline is damaged, and the loose flange 4 is sleeved in the pulp pipe 1, if the axial thickness is too large, the installation and the movement are more difficult, so the axial thickness of the loose flange 4 is designed to be smaller than the axial thickness of the flanging cylinder 32, namely the effective fastening connection of the loose flange 4 and the flange connecting piece 2 is ensured, and avoids the influence of the overlarge stress on the connection between the pulp pipe 1 and the conical flanging pipe 3 on the connection strength of the pulp pipe and the conical flanging pipe.
The wall thickness S of the conical flanging pipe 3 is the same as that of the slurry pipe 1, and the smooth of the joint of the inner walls of the slurry pipe 1 and the conical flanging pipe 3 is ensured through V-shaped groove welding, so that the step at the joint is effectively prevented, the connection strength of the conical flanging pipe and the slurry pipe can be effectively ensured through the V-shaped groove welding, and the service life of the reducing pipeline connection is prolonged; the internal diameter J of the loose flange 4 is larger than the external diameter of the pulp pipe 1, so that the loose flange 4 can move on the pulp pipe 1 and move to the conical flanging pipe 3 from the pulp pipe 1, and the installation and the disassembly of the loose flange 4 are quite convenient.
The invention also protects a method for connecting the reducing pipelines, which adopts the reducing pipeline connecting device for connection and is characterized in that a loose flange 4 is sleeved on a pulp pipe 1, then one end of the pulp pipe 1 with the same inner diameter as that of a conical flanging pipe 3 is coaxially fixed, then the loose flange 4 is moved to the conical flanging pipe 3 and is abutted against the flanging of the conical flanging pipe 3, and finally a connecting bolt 5 is used for fastening and connecting a flange connecting piece 2 and the loose flange 4, thereby realizing the connection of the pulp pipe 1 and the flange connecting piece 2.
In the connection process, before fastening flange joint spare 2 and loose flange 4 with connecting bolt 5, add pad seal ring 6 between toper turn-ups pipe 3 and flange joint spare 2, rethread connecting bolt 5's fastening, draw flange joint spare 2 and loose flange 4 near gradually, press from both sides tight seal ring 6, fastening power through connecting bolt 5 presss from both sides tight seal ring 6, in order to improve the connection reliability between flange joint spare 2 and the loose flange 4, connecting bolt 5 should be a plurality ofly along axial evenly distributed, make fastening power along circumference evenly distributed, guarantee fastening reliability.
The term "one end of the pulp pipe 1 having the same inner diameter as the tapered flanging pipe 3 is coaxially fixed" means that the end faces of the pulp pipe 1 and the tapered flanging pipe 3, which are connected, are respectively subjected to chamfering treatment, so that the pulp pipe 1 and the tapered flanging pipe 3 are coaxially aligned and contacted, a V-shaped groove is formed between the end faces of the pulp pipe 1 and the tapered flanging pipe 3, and then the V-shaped groove is filled by welding, so that the pulp pipe 1 and the tapered flanging pipe 3 are coaxially fixed. Through V type groove welding, guarantee the level and smooth of the inner wall junction of thick liquid pipe 1 and toper turn-ups pipe 3, effectively prevent that the junction from appearing the step to V type groove welding also can effectively guarantee joint strength between them, improves the life of reducing pipe connection.
The manufacturing process of the conical flanging pipe 3 comprises the following steps: firstly, selecting a flanging cylinder 32 with the axial thickness larger than that of the loose flange 4 and the wall thickness equal to that of the pulp pipe 1, selecting a conical cylinder with the wall thickness equal to that of the pulp pipe 1, then respectively conducting chamfering treatment on the end surfaces of the flanging cylinder 32 and the conical cylinder 31, then coaxially aligning the flanging cylinder 32 and the conical cylinder 31, conducting groove welding, and finally polishing the welding position of the flanging cylinder 32 and the conical cylinder 31 to enable smooth transition between the flanging cylinder 32 and the conical cylinder 31. The inner wall of the conical flanging pipe 3 is ensured to be smooth, the axial thickness of the flanging cylinder 32 is determined according to the axial thickness of the loose flange 4, the effective fastening connection of the loose flange 4 and the flange connecting piece 2 is ensured, and the connection strength between the pulp pipe 1 and the conical flanging pipe 3 is prevented from being influenced by overlarge stress at the joint of the pulp pipe 1 and the conical flanging pipe.
The reducing pipeline connecting device and the connecting method of the reducing pipeline have the advantages that:
1. the flow rate of the slurry is stabilized, and the flow stability of the slurry at the joint of the reducing pipelines is improved.
2. The reducing pipeline is connected without steps, and has smooth transition, thereby avoiding the phenomenon of slurry hanging and meeting the requirement of stable pressure of special paper pulp liquid and no slurry hanging between connecting pieces.
3. The detachable connection of the slurry pipe and the flange connecting piece is realized, the connection and the detachment are quite convenient, and the installation and the maintenance of the reducing pipeline are easy.
4. The axial alignment degree of the joint of the reducing pipelines is improved, the alignment degree of the slurry pipe and the flange connecting piece is higher, and the phenomenon of misalignment is avoided from influencing the flowing efficiency of the slurry.
5. The loose flange is sleeved outside the conical flanging pipe and is not in direct contact with the liquid of the slurry pipe, so that the slurry is prevented from corroding the loose flange.
6. The sealing washer is used for sealing between the conical flanging pipe and the flange connecting piece, so that the pollution of external impurities to the slurry can be avoided, the slurry is effectively prevented from leaking, and the connection reliability of the reducing pipeline is improved.
7. The effective fastening connection of the loose flange and the flange connecting piece is ensured, the connection strength of the pulp pipe and the conical flanging pipe is prevented from being influenced by overlarge stress at the joint of the pulp pipe and the conical flanging pipe, and the service life of the reducing pipe connection is long.
The technical solutions of the embodiments of the present invention are fully described above with reference to the accompanying drawings, and it should be noted that the described embodiments are only some embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Claims (5)
1. The method for connecting the different-diameter pipelines adopts a different-diameter pipeline connecting device for connection, the different-diameter pipeline connecting device comprises a slurry pipe (1) and a flange connecting piece (2) with different inner diameters of the slurry pipe (1), and further comprises a conical flanging pipe (3) with a flanging at one end, a loose sleeve flange (4) and a connecting bolt (5), wherein the loose sleeve flange (4) has the same standard as the flange of the flange connecting piece (2), the end, without the flanging, of the conical flanging pipe (3) is equal to the inner diameter of the slurry pipe (1) and is coaxially fixed with the slurry pipe (1), the end with the flanging is equal to the inner diameter of the flange connecting piece (2), the loose sleeve flange (4) is sleeved on the conical flanging pipe (3) and is in abutting fit with the flanging of the conical flanging pipe (3), and the loose sleeve flange (4) is connected with the flange connecting piece (2) through the connecting bolt (5);
the cone-shaped flanging pipe (3) consists of a cone-shaped cylinder (31) and a flanging cylinder (32) which has a right-angle cross section and is coaxially connected with the cone-shaped cylinder (31), one end of the cone-shaped cylinder (31) is coaxially fixed with the pulp pipe (1), the inner diameter of the cone-shaped cylinder is equal to that of the pulp pipe (1), the inner diameter of the other end of the cone-shaped cylinder is equal to that of the flanging cylinder (32), the inner diameter of the flanging cylinder (32) is equal to that of the flange connecting piece (2), and the loose flange (4) is abutted and matched with the flanging cylinder (32);
the flanging cylinder (32) comprises an axial ring (32.1) coaxially connected with the conical cylinder (31) and a radial flanging (32.2) which is perpendicular to the axial ring (32.1) and is turned out along the radial direction, the axial ring (32.1) and the radial flanging (32.2) are in round angle transition, and the radial flanging (32.2) is abutted with the loose flange (4);
the connection method is characterized by comprising the following steps:
firstly, sleeving a loose flange (4) on a pulp pipe (1), then coaxially fixing the pulp pipe (1) and one end with the same inner diameter of a conical flanging pipe (3), moving the loose flange (4) onto the conical flanging pipe (3) and abutting against the flanging of the conical flanging pipe (3), and finally fastening and connecting a flange connecting piece (2) and the loose flange (4) by using a connecting bolt (5), thereby realizing the connection of the pulp pipe (1) and the flange connecting piece (2);
the 'coaxially fixing one end of the pulp pipe (1) with the same inner diameter as the tapered flanging pipe (3)' means that the end surfaces of the pulp pipe (1) and the tapered flanging pipe (3) which are connected are respectively subjected to angle guiding treatment, so that the pulp pipe (1) and the tapered flanging pipe (3) are coaxially aligned and contacted, a V-shaped groove is formed between the end surfaces of the pulp pipe (1) and the tapered flanging pipe (3) which are connected, and then the V-shaped groove is filled through welding, so that the pulp pipe (1) and the tapered flanging pipe (3) are coaxially fixed;
the manufacturing process of the conical flanging tube (3) is as follows: firstly, a flanging barrel (32) with the axial thickness larger than that of the loose flange (4) and the wall thickness equal to that of the pulp pipe (1) is selected, a conical barrel (31) with the wall thickness equal to that of the pulp pipe (1) is selected, then the end faces of the flanging barrel (32) and the conical barrel (31) are respectively subjected to angle guiding treatment, then the flanging barrel (32) and the conical barrel (31) are coaxially aligned and subjected to groove welding, and finally the welding part of the flanging barrel (32) and the conical barrel (31) is polished to enable the flanging barrel (32) and the conical barrel (31) to be in smooth transition.
2. The method of connecting reduced diameter pipes according to claim 1, wherein: the surface of the loose flange (4) abutted against the flange of the conical flanging pipe (3) is provided with an annular positioning sinking groove (41) corresponding to the flange of the conical flanging pipe (3), and the flange of the conical flanging pipe (3) is embedded into the annular positioning sinking groove (41) and is matched with the annular positioning sinking groove (41) in a radial positioning mode.
3. The method of connecting reduced diameter pipes according to claim 1, wherein: toper turn-ups pipe (3) and flange joint spare (2) between accompany seal ring (6), the internal diameter of seal ring (6) be greater than the internal diameter of flange joint spare (2), and the axial thickness of seal ring (6) is not less than 5 mm.
4. The method of connecting reduced diameter pipes according to claim 1, wherein: the axial thickness of the loose flange (4) is smaller than that of the flanging cylinder (32).
5. The method of connecting reduced diameter pipes according to claim 1, wherein: the wall thickness of the conical flanging pipe (3) is the same as that of the slurry pipe (1), the conical flanging pipe is welded through a V-shaped groove, and the inner diameter of the loose flange (4) is larger than the outer diameter of the slurry pipe (1).
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| CN203348786U (en) * | 2013-07-05 | 2013-12-18 | 吴江市得可利纺织品有限公司 | Lined stainless steel reducer pipe fitting |
| CN103807531A (en) * | 2014-02-25 | 2014-05-21 | 中国科学院电子学研究所 | Lap joint metal sealing flange |
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| CN108468887A (en) | 2018-08-31 |
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