Accurately-matched plastic lining metal pipe connecting device

Abstract

The invention discloses a precise fitting plastic lining metal pipe connecting device which is characterized in that a first plastic lining is sleeved with a metal flange, a metal pipe is welded to the right end of the metal flange, a second plastic lining is sleeved with the metal pipe, and the first plastic lining and the second plastic lining abut against each other; mounting rings are mounted in the first plastic lining and the second plastic lining, tensioning mechanisms are arranged in the mounting rings, compensation mechanisms are arranged on the tensioning mechanisms, sealing washers are arranged on the tensioning mechanisms and the compensation mechanisms, the mounting rings and the tensioning mechanisms are arranged, the tensioning mechanisms are sleeved with the sealing washers, and the sealing washers are arranged on the outer portions of the sealing washers. After the metal flange and the metal pipe are welded and the first plastic lining and the second plastic lining abut against each other, the mounting ring is arranged at the joint of the metal flange and the metal pipe, and the sealing washer is tightly pressed through expansion of the tensioning mechanism, so that the joint of the metal flange and the metal pipe is sealed, and corrosion of a metal part caused by leakage is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline connection, and in particular to a precisely fitting plastic-lined metal pipe connection device. Background Art

[0002] The main purpose of installing linings on metal pipes is to enhance the corrosion resistance, pressure resistance and service life of the pipes. When installing metal pipes, metal flanges will be welded at both ends of the pipes for connection, and plastic liners are usually installed on the flanges and inside the pipes. After the flanges are welded to the metal pipes, the plastic liners between the two will abut against each other. Since the two plastic liners are directly sleeved on the metal pipes and flanges, it is impossible to ensure that the linings and the metal pipes and the inner walls of the flanges are completely fitted together. There may be a gap between the two. During use, high-pressure gas or liquid may contact the metal pipe through the gap and cause corrosion. To this end, we have designed a metal pipe connection device that precisely fits the plastic liner. Summary of the invention

[0003] The invention provides a precisely fitting plastic-lined metal pipe connecting device, which solves the problem that high-pressure gas or liquid may come into contact with the metal pipe through the gap during use and cause corrosion.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A precisely fitting plastic-lined metal pipe connection device comprises a metal flange, wherein a first plastic liner is sleeved inside the metal flange, a metal pipe is welded to the right end of the metal flange, a second plastic liner is sleeved inside the metal pipe, and the first plastic liner and the second plastic liner are in contact with each other;

[0006] The plastic liner one and the plastic liner two are installed with mounting rings inside, a tensioning mechanism is arranged inside the mounting ring, a compensation mechanism is arranged on the tensioning mechanism, sealing gaskets are arranged on the tensioning mechanism and the compensation mechanism, and the sealing gaskets are tightly pressed against the inner walls of the plastic liner one and the plastic liner two.

[0007] Furthermore, a placement groove and a sealing groove of an annular structure are provided on the left side surface of the metal flange, a sealing ring is provided in the sealing groove, an orthogonal surface is integrally formed at the left end of the plastic liner 1, the size of the orthogonal surface is consistent with the size of the placement groove, and a tooth groove or pattern is provided at the contact portion between the inner wall of the placement groove and the orthogonal surface. After the two metal flanges are butt-jointed and pressed together, the orthogonal surface of the plastic liner 1 is compressed and flows to fill the space of the placement groove, and extends to fill the gap, thereby generating a main seal of the flange assembly, and the diameter of the placement groove is consistent with the diameter of the orthogonal surface, so that no gap will appear between the two during the installation process;

[0008] An O-shaped groove is also provided on the orthogonal surface of the plastic liner, and an O-shaped ring is provided in the O-shaped groove. When the two metal flanges are butt-jointed and installed, the mating surface of one orthogonal surface is flat, and the O-shaped ring is provided on the other orthogonal surface. The part located thereon will compress the O-shaped ring so that it is completely embedded in the O-shaped groove of the orthogonal surface, thereby producing a primary seal.

[0009] Furthermore, a mounting ring groove is provided on the outer ring surface of the mounting ring, three groups of mounting screw seats distributed in an annular shape are welded to the inner ring of the mounting ring, a movable cavity is formed in the hollow interior of the mounting screw seat, and a threaded hole is provided at the front end of the mounting screw seat, the threaded hole is connected with the movable cavity, three groups of connecting ports distributed in an annular shape are provided on the mounting ring groove, the connecting ports are connected with the interior of the movable cavity, the outer diameter of the mounting ring is smaller than the inner diameter of the plastic liner one and the plastic liner two, and the outer diameter and inner diameter of the plastic liner one and the plastic liner two are exactly the same, and the mounting ring is placed at the docking part of the plastic liner one and the plastic liner two.

[0010] Further, the tensioning mechanism comprises six groups of tensioning arc blocks distributed in an annular shape, three groups of evenly distributed lifting push blocks are arranged on the lower surface of the tensioning arc block, a lifting ring is rotatably installed in the mounting ring groove of the mounting ring, and a plurality of lifting parts distributed in a circumferential array are arranged on the outer ring surface of the lifting ring, the lifting parts are in sliding contact with the lifting push blocks, and the rotation of the lifting ring causes the lifting parts to rotate together, thereby causing the lifting parts to slide along the surface of the lifting push blocks, so that the lifting push blocks and the tensioning arc blocks move upward as a whole;

[0011] A guide portion is provided at the rear side of the tensioning arc block, and six groups of linear grooves distributed in a circumferential array are provided on the inner wall of the mounting ring groove. The guide portion is slidably placed in the linear groove, and the tensioning arc block can be lifted and lowered along the linear groove, so that its moving trajectory is determined and no deflection occurs;

[0012] The inner side wall of the lifting ring is provided with three groups of deflection blocks distributed in a ring shape, and the ends of the three groups of deflection blocks away from the lifting ring 55 are respectively passed through corresponding connecting holes and placed in the movable cavity of the mounting screw seat, and the threaded holes of the mounting screw seat are threadedly connected with bolts, and the front half of the end of the deflection block close to the threaded hole is provided with a deflection arc surface, and the rear half is horizontally arranged to form a plane, and the rear half of the bolt is provided with a smooth section, and the smooth section is in contact with the plane. When the bolt is screwed into the threaded hole, the smooth section of the bolt first contacts the deflection arc surface and then pushes the deflection block to deflect, thereby causing the entire lifting ring to deflect as a whole, and when the smooth section contacts the plane, no deflection will occur, so that the bolt is easy to be completely screwed into the threaded hole.

[0013] Furthermore, the six groups of tensioning arc blocks form a circular structure after being unfolded, and the outer diameter of the circular structure matches the inner diameter of the plastic liner one. The circular structure formed by the tensioning arc blocks is slightly smaller than the inner diameter of the plastic liner one, and can compress the external sealing gasket, so that a tight sealing structure is formed between the plastic liner one, the plastic liner two and the sealing gasket, so that the internal gas or liquid will not enter the gap between the metal tube and the plastic liner two;

[0014] The lower surface of the lifting push block is arranged in an arc-shaped structure to form a contact arc surface, and the curvature of the contact arc surface is consistent with the curvature of the lifting ring. The right end of the lifting push block is chamfered to form a lifting arc surface. The thickness of the lifting arc surface gradually increases near the contact arc surface. The lifting part can push it to move upward when moving along the lifting arc surface. When it moves to the contact arc surface, it will not move upward, and it moves to the maximum position at this time.

[0015] Furthermore, the compensation mechanism comprises two driving rings fixed at the front and rear ends of the lifting ring, and the driving rings are provided with six groups of driving parts distributed in a ring shape;

[0016] Parts are cut out on the six tensioning arc blocks to form installation notches, and two groups of deflection arc holes are opened on the installation notches. An abutment arc block is slidably arranged in each of the installation notches, and two groups of driving rods are arranged at the lower ends of the abutment arc blocks, and the driving rods pass through the deflection arc holes and are placed thereunder. The driving rods are in contact with the driving parts, and the driving ring can rotate therewith when the lifting ring is deflected, so that the abutment arc block can move upward and deflect through the driving part and the driving rod, and the abutment arc block can abut against adjacent tensioning arc blocks, thereby closing the gap between two adjacent tensioning arc blocks, so that the upper sealing gaskets are all compressed, and no position is left uncompressed, thereby improving the sealing performance.

[0017] Furthermore, the depth of the installation notch is greater than the thickness of the abutting arc block, and the length of the installation notch is less than the length of the abutting arc block. The abutting arc block can be received in the installation notch, and in the initial state, the abutting arc block will not directly contact the sealing gasket along with the tensioning arc block, which is convenient for subsequent movement compensation of the abutting arc block, so that the tensioning arc block and the abutting arc block can completely press the edges of both sides of the sealing gasket, leaving no position unpressed, thereby improving the sealing performance.

[0018] Furthermore, the arc-shaped structure design of the lower half of the left side surface of the driving part forms a lifting slope, the upper extension design of the driving part forms an extension part, and the extension part extends into the deflection arc hole, the left side surface of the extension part is a straight surface design to form a pushing surface, and the bottom end of the driving rod is a hemispherical structure. When the driving part moves with the driving ring, the driving rod can move upward along the lifting slope, and then be deflected to the upper left by the pushing surface and abut against the adjacent tensioning arc block and the sealing gasket above.

[0019] Furthermore, the inner walls of the mounting ring groove on both sides of the mounting ring are provided with a plurality of guide grooves distributed in an annular shape, the guide grooves include a straight lifting groove arranged in a straight line, a deflection arc groove is arranged above the straight lifting groove, the straight lifting groove matches the moving track of the tensioning arc block, and the tensioning arc block makes the abutting arc block move together when it is expanded outward;

[0020] The abutting arc block is inserted with guide rods at the front and rear ends, and the front and rear ends of the guide rods are respectively extended into the guide grooves of the front and rear inner walls of the mounting ring groove and slidably contacted, so that the abutting arc block moves along the guide groove. Initially, it can expand outward in a straight line along the lifting straight groove together with the tensioning arc block, and then the action of the driving part unfolds along the deflection arc groove and abuts against the adjacent tensioning arc block and the sealing gasket above.

[0021] Beneficial effects of the present invention:

[0022] 1. By setting a mounting ring and a tensioning mechanism, a sealing gasket is sleeved on the outside of the tensioning mechanism. After the metal flange and the metal pipe are welded, and the plastic liner 1 and the plastic liner 2 are abutted, the mounting ring is placed at the connection between the two, and the sealing gasket is tightly pressed by expanding the tensioning mechanism, so that the connection between the two is sealed, and no leakage will occur to cause corrosion of the metal part;

[0023] 2. By setting a compensation mechanism on the tensioning mechanism, the gaps between the multiple tensioning arc blocks after expansion can be filled, and the tensioning arc blocks and the abutting arc blocks can completely press the edges of both sides of the sealing gasket, leaving no unpressed position, thereby improving the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a main diagram of a precise plastic-lined metal pipe connection device proposed by the present invention;

[0025] Figure 2 for Figure 1 Exploded diagram of

[0026] Figure 3 A cross-sectional view of a precisely fitting plastic lined metal pipe connection device;

[0027] Figure 4 for Figure 1 Structural diagram of the middle mounting ring, tensioning mechanism and compensation mechanism;

[0028] Figure 5 for Figure 4 The enlarged schematic diagram at A in the middle;

[0029] Figure 6 for Figure 4 The enlarged schematic diagram of point B in the middle;

[0030] Figure 7 for Figure 4 The enlarged schematic diagram at C in the middle;

[0031] Figure 8 It is a cross-sectional schematic diagram of the mounting ring, the tensioning mechanism and the compensation mechanism;

[0032] Fig. 9 for Figure 8 Enlarged schematic diagram at point D in the middle.

[0033] Numbers in the figure: 1, metal flange; 11, placement groove; 12, sealing groove; 2, plastic liner 1; 21, orthogonal surface; 211, O-ring; 22, sealing ring; 3, metal pipe; 31, plastic liner 2; 4, mounting ring; 41, mounting screw seat; 411, threaded hole; 42, mounting ring groove; 43, connecting port; 44, guide groove; 441, deflection arc groove; 442, lifting straight groove; 45, straight groove; 5, tensioning mechanism; 51, tensioning arc block; 511, installation Install notch; 512, deflection arc hole; 52, bolt; 521, smooth section; 53, deflection block; 531, deflection arc surface; 54, lifting push block; 541, lifting arc surface; 542, contact arc surface; 55, lifting ring; 551, lifting part; 56, guide part; 6, compensation mechanism; 61, abutment arc block; 611, guide rod; 612, drive rod; 62, drive ring; 621, drive part; 622, lifting slope; 623, push surface; 7, sealing gasket. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] Reference Figure 1-9 , a precisely fitting plastic-lined metal pipe connection device, comprising a metal flange 1, a plastic liner 1 2 is sleeved inside the metal flange 1, a metal pipe 3 is welded to the right end of the metal flange 1, a plastic liner 2 31 is sleeved inside the metal pipe 3, and the plastic liner 1 2 and the plastic liner 2 31 are in contact with each other;

[0036] A mounting ring 4 is installed inside the plastic liner 1 2 and the plastic liner 2 31 , a tensioning mechanism 5 is arranged inside the mounting ring 4 , a compensation mechanism 6 is arranged on the tensioning mechanism 5 , a sealing gasket 7 is arranged on the tensioning mechanism 5 and the compensation mechanism 6 , and the sealing gasket 7 is tightly pressed against the inner wall of the plastic liner 1 2 and the plastic liner 2 31 .

[0037] The left side surface of the metal flange 1 is provided with a placement groove 11 and a sealing groove 12 of an annular structure, a sealing ring 22 is arranged in the sealing groove 12, and an orthogonal surface 21 is integrally formed at the left end of the plastic liner 2, the size of the orthogonal surface 21 is consistent with the size of the placement groove 11, and the contact part between the inner wall of the placement groove 11 and the orthogonal surface 21 is provided with a tooth groove or a pattern. After the two metal flanges 1 are butt-jointed, installed and pressed together, the orthogonal surface 21 of the plastic liner 2 is compressed and flows to fill the space of the placement groove 11, and extends to fill the gap, thereby generating the main seal of the flange assembly, and the diameter of the placement groove 11 is consistent with the diameter of the orthogonal surface 21, so that there will be no gap between the two during the installation process;

[0038] An O-shaped groove is also provided on the orthogonal surface 21 of the plastic liner 2, and an O-shaped ring 211 is provided in the O-shaped groove. When the two metal flanges 1 are butt-jointed, the mating surface of one orthogonal surface 21 is flat, and the O-shaped ring 211 is provided on the other orthogonal surface 21. The portion located thereon will compress the O-shaped ring 211, so that it is completely embedded in the O-shaped groove of the orthogonal surface 21, thereby producing a primary seal.

[0039] The outer ring surface of the mounting ring 4 is provided with a mounting ring groove 42, and the inner ring of the mounting ring 4 is welded with three groups of mounting screw seats 41 distributed in an annular shape. The interior of the mounting screw seat 41 is hollow to form a moving cavity, and a threaded hole 411 is provided at the front end of the mounting screw seat 41, and the threaded hole 411 is connected with the moving cavity. Three groups of connecting ports 43 distributed in an annular shape are provided on the mounting ring groove 42, and the connecting ports 43 are connected with the inside of the moving cavity. The outer diameter of the mounting ring 4 is smaller than the inner diameter of the plastic liner 1 2 and the plastic liner 2 31, and the outer diameter and inner diameter of the plastic liner 1 2 and the plastic liner 2 31 are completely consistent, and the mounting ring 4 is placed at the docking part of the plastic liner 1 2 and the plastic liner 2 31.

[0040] The tensioning mechanism 5 includes six groups of tensioning arc blocks 51 distributed in an annular shape. Three groups of evenly distributed lifting push blocks 54 are arranged on the lower surface of the tensioning arc blocks 51. A lifting ring 55 is rotatably installed in the mounting ring groove 42 of the mounting ring 4. The outer ring surface of the lifting ring 55 is provided with a plurality of lifting portions 551 distributed in a circumferential array. The lifting portions 551 are in sliding contact with the lifting push blocks 54. The rotation of the lifting ring 55 causes the lifting portions 551 to rotate together, thereby causing the lifting portions 551 to slide along the surface of the lifting push blocks 54, so that the lifting push blocks 54 and the tensioning arc blocks 51 move upward as a whole.

[0041] A guide portion 56 is provided at the rear side of the tensioning arc block 51, and six groups of linear grooves 45 distributed in a circumferential array are provided on the inner wall of the mounting ring groove 42. The guide portion 56 is slidably placed in the linear grooves 45, and the tensioning arc block 51 can be lifted and lowered along the linear grooves 45, so that its moving trajectory is determined and no deflection occurs;

[0042] The inner wall of the lifting ring 55 is provided with three groups of deflection blocks 53 distributed in a ring shape, and the ends of the three groups of deflection blocks 53 away from the lifting ring 55 are respectively passed through the corresponding connecting holes and placed in the moving cavity of the mounting screw seat 41, and the threaded hole 411 of the mounting screw seat 41 is threadedly connected with a bolt 52, and the front half of the end of the deflection block 53 close to the threaded hole 411 is provided with a deflection arc surface 531, and the rear half thereof is horizontally arranged to form a plane, and the rear half of the bolt 52 is provided with a smooth section 521, and the smooth section 521 contacts the plane. When the bolt 52 is screwed into the threaded hole 411, the smooth section 521 of the bolt 52 first contacts the deflection arc surface 531 and then pushes the deflection block 53 to deflect, thereby causing the entire lifting ring 55 to deflect as a whole, and when the smooth section 521 contacts the plane, no deflection will occur, so that the bolt 52 is convenient to be completely screwed into the threaded hole 411.

[0043] After the six sets of tensioning arc blocks 51 are unfolded, they form a circular structure, and the outer diameter of the circular structure matches the inner diameter of the plastic liner 1 2. The circular structure formed by the tensioning arc blocks 51 is slightly smaller than the inner diameter of the plastic liner 1 2, and can compress the external sealing gasket 7, so that a tight sealing structure is formed between the plastic liner 1 2, the plastic liner 2 31 and the sealing gasket 7, so that the internal gas or liquid will not enter the gap between the metal tube 3 and the plastic liner 2 31;

[0044] The lower surface of the lifting push block 54 is arranged in an arc-shaped structure to form a contact arc surface 542, and the curvature of the contact arc surface 542 is consistent with the curvature of the lifting ring 55. The right end of the lifting push block 54 is chamfered to form a lifting arc surface 541. The thickness of the lifting arc surface 541 gradually increases near the contact arc surface 542. The lifting part 551 can push it to move upward when moving along the lifting arc surface 541, and will not move it upward when it moves to the contact arc surface 542. At this time, it moves to the maximum position.

[0045] The compensation mechanism 6 includes two driving rings 62 fixed at the front and rear ends of the lifting ring 55, and the driving ring 62 is provided with six groups of driving parts 621 distributed in an annular shape;

[0046] Parts of the six tensioning arc blocks 51 are cut away to form installation notches 511, and two groups of deflection arc holes 512 are opened on the installation notches 511. An abutment arc block 61 is slidably set in each installation notch 511, and two groups of driving rods 612 are set at the lower end of the abutment arc block 61. The driving rods 612 pass through the deflection arc holes 512 and are placed thereunder. The driving rods 612 are in contact with the driving parts 621. When the lifting ring 55 is deflected, the driving ring 62 can rotate therewith, and then the abutment arc block 61 can be moved upward and deflected through the driving part 621 and the driving rod 612. The abutment arc block 61 can abut against the adjacent tensioning arc blocks 51, thereby closing the gap between the two adjacent tensioning arc blocks 51, so that the upper sealing gasket 7 is completely compressed, and no position is left uncompressed, thereby improving the sealing performance.

[0047] The depth of the installation notch 511 is greater than the thickness of the abutting arc block 61, and the length of the installation notch 511 is less than the length of the abutting arc block 61. The abutting arc block 61 can be received in the installation notch 511, and in the initial state, the abutting arc block 61 will not directly contact the sealing gasket 7 along with the tensioning arc block 51, which is convenient for the subsequent movement compensation of the abutting arc block 61, so that the tensioning arc block 51 and the abutting arc block 61 can completely press the edges of both sides of the sealing gasket 7, leaving no position unpressed, thereby improving the sealing performance.

[0048] The arc-shaped structure design on the lower half of the left side surface of the driving part 621 forms a lifting slope 622. The upper part of the driving part 621 is extended to form an extended part, and the extended part extends into the deflection arc hole 512. The left side surface of the extended part is a straight surface design to form a pushing surface 623. The bottom end of the driving rod 612 is a hemispherical structure. When the driving part 621 moves with the driving ring 62, the driving rod 612 can move upward along the lifting slope 622, and then be deflected to the upper left by the pushing surface 623 and abut against the adjacent tensioning arc block 51 and the sealing gasket 7 above.

[0049] A plurality of guide grooves 44 are provided on the inner walls of the front and rear sides of the mounting ring groove 42 of the mounting ring 4. The guide grooves 44 include a straight lifting groove 442 arranged in a straight line. A deflection arc groove 441 is arranged above the straight lifting groove 442. The straight lifting groove 442 matches the moving track of the tensioning arc block 51. When the tensioning arc block 51 is expanded outward, the abutting arc block 61 moves together.

[0050] A guide rod 611 is inserted through the front and rear of the abutting arc block 61, and the front and rear ends of the guide rod 611 respectively extend into the guide grooves 44 of the front and rear inner walls of the mounting ring groove 42 and slide in contact, so that the abutting arc block 61 moves along the guide grooves 44. Initially, it can expand outward in a straight line along the lifting straight groove 442 together with the tensioning arc block 51, and then the action of the driving part 621 is expanded along the deflection arc groove 441 and abuts against the adjacent tensioning arc block 51 and the sealing gasket 7 above.

[0051] Working principle: In actual use, the plastic liner 1 2 is sleeved in the metal flange 1, and the orthogonal surface 21 is placed in the placement groove 11. The metal flange 1 is positioned and butt-welded to the metal pipe 3 with the plastic liner 2 31, wherein the plastic liner 2 31 is directly sleeved in the metal pipe 3, and the plastic liner 1 2 is in contact with the plastic liner 2 31. When the two sets of metal flanges 1 are butt-jointed, the mating surface of one orthogonal surface 21 is flat, and an O-ring 211 is set on the other orthogonal surface 21. The part located on it will compress the O-ring 211, so that it is completely embedded in the O-groove of the orthogonal surface 21, thereby generating a main seal, and then it can be fixed by screws and nuts;

[0052] After the plastic liner 1 2 is brought into contact with the plastic liner 2 31, the mounting ring 4 is placed at the butt joint of the plastic liner 1 2 and the plastic liner 2 31, and the outer surfaces of the plurality of tensioning arc blocks 51 are sleeved with sealing washers 7, and then a bolt 52 is screwed into the threaded hole 411 of one of the mounting screw seats 41 by a tool;

[0053] When the bolt 52 is screwed into the threaded hole 411, the smooth section 521 of the bolt 52 first contacts the deflection arc surface 531 and then pushes the deflection block 53 to deflect, thereby causing the entire lifting ring 55 to deflect as a whole. The rotation of the lifting ring 55 causes the lifting portion 551 to rotate together, thereby causing the lifting portion 551 to slide along the surface of the lifting push block 54, thereby causing the lifting push block 54 and the tensioning arc block 51 to move upward together. At this time, multiple tensioning arc blocks 51 simultaneously expand outward to form a circular structure, which can compress the external sealing gasket 7, thereby forming a tight sealing structure between the plastic liner 1 2, the plastic liner 2 31 and the sealing gasket 7;

[0054] When the tension arc block 51 is fully expanded, the lifting portion 551 moves along the lifting arc surface 541 to the contact arc surface 542 without causing it to move upward, and during the tension arc block 51 expansion to the left, the contact arc block 61 will expand outward along the lifting straight groove 442 through the guide rod 611 until the tension arc block 51 is fully expanded, and the guide rod 611 is at the connection between the lifting straight groove 442 and the deflection arc groove 441;

[0055] Continue to screw in the bolt 52. At this time, the lifting ring 55 continues to deflect under the action of the bolt 52, and the two driving rings 62 deflect together, so that the abutting arc block 61 moves along the deflection arc groove 441 and abuts against the adjacent tensioning arc block 51 and the sealing gasket 7 above. Then, screw the bolts 52 into the other two threaded holes 411 to further support them.

[0056] By providing the mounting ring 4 and the tensioning mechanism 5, the outer sleeve of the tensioning mechanism 5 is sleeved with a sealing gasket 7. After the metal flange 1 and the metal pipe 3 are welded, and the plastic liner 1 2 and the plastic liner 2 31 are abutted, the mounting ring 4 is placed at the connection between the two, and the sealing gasket 7 is tightly pressed by expanding the tensioning mechanism 5, so that the connection between the two is sealed, and no leakage will occur to cause corrosion of the metal parts;

[0057] By setting a compensation mechanism 6 on the tensioning mechanism 5, the gaps between the multiple tensioning arc blocks 51 after expansion can be filled, and the tensioning arc blocks 51 and the abutting arc blocks 61 can completely press the edges of both sides of the sealing gasket 7 without leaving any unpressed positions, thereby improving the sealing performance.

[0058] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A precise fitting plastic-lined metal pipe connection device, comprising a metal flange (1), characterized in that: A plastic liner 1 (2) is sleeved inside the metal flange (1), a metal pipe (3) is welded to the right end of the metal flange (1), a plastic liner 2 (31) is sleeved inside the metal pipe (3), and the plastic liner 1 (2) and the plastic liner 2 (31) are in contact with each other; The plastic liner one (2) and the plastic liner two (31) are internally installed with a mounting ring (4), a tensioning mechanism (5) is arranged inside the mounting ring (4), a compensation mechanism (6) is arranged on the tensioning mechanism (5), a sealing gasket (7) is arranged on the tensioning mechanism (5) and the compensation mechanism (6), and the sealing gasket (7) is tightly pressed against the inner wall of the plastic liner one (2) and the plastic liner two (31).

2. A precise fitting plastic lined metal pipe connection device according to claim 1, characterized in that: The left side surface of the metal flange (1) is provided with a placement groove (11) and a sealing groove (12) of an annular structure, a sealing ring (22) is arranged in the sealing groove (12), and the left end of the plastic liner (2) is integrally formed with an orthogonal surface (21), and the size of the orthogonal surface (21) is consistent with the size of the placement groove (11); An O-shaped groove is also provided on the orthogonal surface (21) of the plastic liner 1 (2), and an O-shaped ring (211) is provided in the O-shaped groove.

3. The precise fitting plastic lined metal pipe connection device according to claim 1, characterized in that: The outer ring surface of the mounting ring (4) is provided with a mounting ring groove (42), the inner ring of the mounting ring (4) is welded with three groups of mounting screw seats (41) distributed in an annular shape, the interior of the mounting screw seat (41) is hollow and forms a movable cavity, and the front end of the mounting screw seat (41) is provided with a threaded hole (411), the threaded hole (411) is connected to the movable cavity, and the mounting ring groove (42) is provided with three groups of connecting ports (43) distributed in an annular shape, and the connecting ports (43) are connected to the interior of the movable cavity.

4. A precise fitting plastic lined metal pipe connection device according to claim 3, characterized in that: The tensioning mechanism (5) comprises six groups of tensioning arc blocks (51) distributed in an annular shape, three groups of evenly distributed lifting and pushing blocks (54) are arranged on the lower surface of the tensioning arc blocks (51), a lifting ring (55) is rotatably installed in the mounting ring groove (42) of the mounting ring (4), a plurality of lifting portions (551) distributed in a circumferential array are arranged on the outer ring surface of the lifting ring (55), and the lifting portions (551) are in sliding contact with the lifting and pushing blocks (54); A guide portion (56) is provided on the rear side of the tensioning arc block (51), and six groups of linear grooves (45) distributed in a circumferential array are provided on the inner wall of the mounting ring groove (42), and the guide portion (56) is slidably placed in the linear grooves (45); The inner side wall of the lifting ring (55) is provided with three groups of deflection blocks (53) distributed in an annular shape. The ends of the three groups of deflection blocks (53) away from the lifting ring (55) are respectively passed through corresponding connecting holes and placed in the moving cavity of the mounting screw seat (41). The threaded hole (411) of the mounting screw seat (41) is internally threadedly connected with a bolt (52). The front half of the end of the deflection block (53) close to the threaded hole (411) is provided with a deflection arc surface (531), and the rear half thereof is horizontally arranged to form a plane. The rear half of the bolt (52) is provided with a smooth section (521), and the smooth section (521) is in contact with the plane.

5. The precise fitting plastic lined metal pipe connection device according to claim 4, characterized in that: The six groups of tensioning arc blocks (51) form a circular structure after being unfolded, and the outer diameter of the circular structure matches the inner diameter of the plastic liner (2); The lower surface of the lifting push block (54) is arranged in an arc-shaped structure to form a contact arc surface (542), and the curvature of the contact arc surface (542) is consistent with the curvature of the lifting ring (55). The right end of the lifting push block (54) is rounded to form a lifting arc surface (541), and the thickness of the lifting arc surface (541) gradually increases near the contact arc surface (542).

6. A precise fitting plastic lined metal pipe connection device according to claim 5, characterized in that: The compensation mechanism (6) comprises two driving rings (62) fixed at the front and rear ends of the lifting ring (55), and the driving ring (62) is provided with six groups of driving parts (621) distributed in a ring shape; Parts of the six tensioning arc blocks (51) are cut away to form mounting notches (511), and two groups of deflection arc holes (512) are provided on the mounting notches (511). An abutment arc block (61) is slidably provided in each of the mounting notches (511), and two groups of driving rods (612) are provided at the lower ends of the abutment arc blocks (61). The driving rods (612) pass through the deflection arc holes (512) and are placed below the deflection arc holes, and the driving rods (612) are in contact with the driving portion (621).

7. A precise fitting plastic lined metal pipe connection device according to claim 6, characterized in that: The depth of the installation notch (511) is greater than the thickness of the abutting arc block (61), and the length of the installation notch (511) is less than the length of the abutting arc block (61).

8. The precise fitting plastic-lined metal pipe connection device according to claim 6, characterized in that: The arc-shaped structure of the lower half of the left side surface of the driving part (621) is designed to form a lifting inclined surface (622), the upper part of the driving part (621) is extended to form an extended part, and the extended part extends into the deflection arc hole (512), the left side surface of the extended part is designed to be a straight surface to form a pushing surface (623), and the bottom end of the driving rod (612) is a hemispherical structure.

9. The precise fitting plastic lined metal pipe connection device according to claim 8, characterized in that: A plurality of guide grooves (44) distributed in an annular shape are provided on the inner walls of the front and rear sides of the mounting ring groove (42) of the mounting ring (4), wherein the guide grooves (44) include straight lifting grooves (442) arranged in a straight line, and a deflection arc groove (441) is arranged above the straight lifting grooves (442); The abutting arc block (61) is penetrated and inserted with a guide rod (611) at the front and rear ends, and the front and rear ends of the guide rod (611) respectively extend into the guide grooves (44) of the front and rear inner walls of the mounting ring groove (42) and are in sliding contact.

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