Pipeline connector

Abstract

A pipeline connector comprises a connecting sleeve, a pressing ring and a pressing sleeve which are sequentially arranged on the pipe end section of a to-be-connected pipeline in a sleeving mode in the pipe length direction, a connecting flange at one end of the connecting sleeve is located at the pipe end of the to-be-connected pipeline, a stepped hole is formed in the other end of the connecting sleeve, and one end of the pressing ring is located at an orifice of the stepped hole. The sealing ring is arranged in an annular cavity defined by the stepped hole of the connecting sleeve, the outer wall of the to-be-connected pipeline and the end face of the pressing ring, and a locking ring is arranged in an annular cavity defined by the pressing sleeve, the outer wall of the to-be-connected pipeline and the end face of the pressing ring. The connecting sleeve and the pressing ring are connected through a first bolt to form the sealing assembly for limiting the connecting sleeve and the pressing ring to move in the opposite direction or the opposite direction, and then the connecting sleeve and / or the pressing ring in the sealing assembly are / is connected with the pressing sleeve through a second bolt. The pre-tightening adjustment of the sealing ring and the pre-tightening adjustment of the locking ring are independently completed, and the pressing ring and the connecting sleeve do not move relatively, so that the sealing and anti-falling reliability of the pipeline connector is ensured.

Description

Technical Field

[0001] The utility model patent relates to a pipeline connecting piece, specifically to a pipeline connector. Background Art

[0002] During pipeline laying or maintenance, it is usually necessary to connect the pipelines. Welding or flange connection is often used to connect pipelines with larger diameters. For bare pipes where welding is inconvenient, adding a flange to the end of the bare pipe is a good option.

[0003] The name is "cast pipe anti-dropout structure" (document number CN206918470U, hereinafter referred to as document 1) discloses that pipe A and inserting pipe are connected in an inserting manner, a gasket is placed between pipe A and inserting pipe, the inserting pipe and the gland are plug-in flexibly connected, and the inserting pipe and the anti-dropout ring are fixedly connected, the flange on pipe A and the gland and the anti-dropout ring are all fixedly connected by bolts and nuts, the conical surface of pipe A and the gasket, the outer surface of the inserting pipe and the inner ring surface of the gasket, the gland and the outer end surface of the gasket are all connected in an extrusion manner, which is used for cast pipe anti-dropout and plugging;

[0004] The technical solution disclosed in the name of "Anti-slip pipe joint" (document number CN216715490U, hereinafter referred to as Document 2) includes a joint body, a connecting flange and a gland. The joint body, the connecting flange and the gland have a first perforation, a second perforation and a third perforation in sequence. The joint body is provided with a countersunk hole, a sealing ring is arranged in the countersunk hole, the inner side wall of the third perforation has an inclined guide surface, and an anti-slip ring is arranged in the third perforation. The joint body and the connecting flange, and the connecting flange and the gland are fixedly connected by bolt connection structures. The bolt connection structure between the joint body and the connecting flange and between the connecting flange and the gland can be the same bolt connection structure or different bolt connection structures;

[0005] The technical solution disclosed in the title "Anti-slip connector for pipe connection" (document number CN113154155A, hereinafter referred to as document 3) includes a first gland, a second gland, a sealing ring, an anti-slip locking ring and a body for inserting a pipe; the first gland and the second gland are respectively in the shape of a collar, the outer periphery of the first gland is provided with a first flange, and the outer periphery of the second gland is provided with a second flange; a sealing ring accommodating portion is formed at the pipe insertion end of the body, and a third flange is provided on the outer side of the sealing ring accommodating portion; the first flange, the second flange and the third flange are connected by a bolt assembly, the sealing ring is provided in the sealing ring accommodating portion and can be sealed with the outer peripheral surface of the pipe after being pressed by the first gland, the anti-slip locking ring is accommodated between the first gland and the second gland, and can be locked to the outer peripheral surface of the pipe after being pressed by the second gland;

[0006] The name "Pipeline Anti-disconnect Connector" (document number CN216643394U, hereinafter referred to as Document 4) is the applicant's prior application document, including a connecting sleeve and a pressing sleeve mounted on the pipe to be connected, the connecting sleeve and the pressing sleeve constitute a connection fit that limits the axial separation of the two, a locking ring and an elastic sealing ring are mounted on the pipe to be connected at the connection between the pressing sleeve and the connecting sleeve, when the pressing sleeve and the connecting sleeve are moved close to each other, the locking ring and the elastic sealing ring constitute mutual axial extrusion fit and radial deformation, the end of the connecting sleeve away from the pressing sleeve is connected to the pipe connector or pipe component, a pressing ring mounted on the pipe to be connected is arranged between the locking ring and the elastic sealing ring, the two ends of the pressing ring are respectively abutted against the locking ring and the elastic sealing ring, the connecting sleeve and the pressing sleeve are connected by a screw, the pressing ring is connected to the screw and constitutes an axial limit, and locking nuts are arranged on the opposite sides of the connecting sleeve and the pressing sleeve.

[0007] In the prior art solution, a bolt is used to connect the connecting sleeve, the pressure ring and the pressure sleeve in sequence, that is, the same bolt connects the three together; the above-mentioned prior art solution has a common defect that the pre-tightening adjustment of the sealing ring and the pre-tightening adjustment of the locking ring cannot be completed independently, resulting in mutual interference between the pre-tightening adjustment of the sealing ring and the pre-tightening adjustment of the locking ring, that is, when adjusting the pre-tightening degree of the sealing ring, the pre-tightening amount of the locking ring that has been adjusted to a suitable anti-slip degree will be destroyed, and vice versa. Summary of the invention

[0008] The utility model provides a pipeline connector, in which the pre-tightening adjustment of a sealing ring and the pre-tightening adjustment of a locking ring are completed independently of each other to ensure the reliability of sealing and anti-slip properties.

[0009] In order to achieve the above-mentioned purpose, the technical solution adopted is: a pipeline connector, comprising a connecting sleeve, a pressure ring and a pressing sleeve which are sequentially sleeved on the pipe end section of the pipe to be connected along the pipe length direction, the connecting flange at one end of the connecting sleeve is located at the pipe end of the pipe to be connected, the other end of the connecting sleeve is a step hole and one end of the pressure ring is located at the orifice of the step hole, the sealing ring is placed in an annular cavity surrounded by the step hole of the connecting sleeve, the outer wall of the pipe to be connected and the end face of the pressure ring, a locking ring is arranged in an annular cavity surrounded by the pressure sleeve, the outer wall of the pipe to be connected and the end face of the pressure ring, the connecting sleeve and the pressure ring are connected by a first bolt to form a sealing assembly which limits the connection sleeve and the pressure ring from moving toward or away from each other, and the connecting sleeve and / or the pressure ring and the pressing sleeve in the sealing assembly are connected by a second bolt.

[0010] Compared with the prior art, the technical effect of the utility model is as follows: when assembling the pipe connector with the pipe to be connected, the connecting sleeve and the pressure ring are first connected by a first bolt to form a sealing assembly that limits the connecting sleeve and the pressure ring from moving toward or away from each other, the connecting sleeve and the pressure ring are fixed in relative position, and then the pressure sleeve is connected to the connecting sleeve and / or the pressure ring by a second bolt, the pre-tightening adjustment of the sealing ring and the pre-tightening adjustment of the locking ring are completed independently of each other, the pressure ring and the connecting sleeve will not be relatively displaced, and the reliability of sealing and anti-detachment of the pipe connector is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional appearance schematic diagram of a first connection implementation method between a connecting sleeve, a pressing ring and a pressing sleeve;

[0012] Figure 2 for Figure 1 K-direction view in;

[0013] Figure 3 It is a cross-sectional view of the assembly state of the locking ring and the sealing ring;

[0014] Figure 4 It is a three-dimensional appearance schematic diagram of a second connection implementation method between the connecting sleeve, the pressing ring and the pressing sleeve;

[0015] Figure 5 for Figure 4 N-way view in;

[0016] Figure 6 It is a partial schematic diagram of a first connection implementation method of a connecting sleeve connecting ear and a pressing ring connecting ear;

[0017] Figure 7 It is a partial schematic diagram of a second connection implementation method of the connecting sleeve connecting ear and the pressure ring connecting ear;

[0018] Figure 8 It is a partial schematic diagram of a third connection implementation mode of the connecting sleeve connecting ear and the pressure ring connecting ear;

[0019] Fig. 9 It is a partial schematic diagram of a fourth connection implementation mode of the connecting sleeve connecting ear and the pressure ring connecting ear;

[0020] Fig.10 It is a partial schematic diagram of a fifth connection implementation mode of the connecting sleeve connecting ear and the pressing ring connecting ear;

[0021] Fig.11 Schematic diagram of the pressure ring. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-11 And related content, the utility model is further described in detail:

[0023] A pipe connector comprises a connecting sleeve 10, a pressing ring 50 and a pressing sleeve 20 which are sequentially sleeved on the pipe end section of a pipe A to be connected along the pipe length direction; a connecting flange 12 at one end of the connecting sleeve 10 is located at the pipe end of the pipe A to be connected; the other end of the connecting sleeve 10 is a step hole and one end of the pressing ring 50 is located at the orifice of the step hole; a sealing ring 40 is placed in an annular cavity surrounded by the step hole of the connecting sleeve 10, the outer wall of the pipe A to be connected and the end face of the pressing ring 50; a locking ring 30 is arranged in an annular cavity surrounded by the pressing sleeve 20, the outer wall of the pipe A to be connected and the end face of the pressing ring 50; the connecting sleeve 10 and the pressing ring 50 are connected by a first bolt 60 to form a sealing assembly which limits the connecting sleeve 10 and the pressing ring 50 from moving toward or away from each other; and the connecting sleeve 10 and / or the pressing ring 50 and the pressing sleeve 20 in the rear sealing assembly are connected by a second bolt 70.

[0024] In the above scheme, the pressing sleeve 20, the pressing ring 50 and the connecting sleeve 10 are sequentially sleeved on the pipe end section from the pipe end of the pipe A to be connected, and the pressing ring 50 is located between the pressing sleeve 20 and the connecting sleeve 10. The connecting sleeve 10 and the pressing ring 50 are connected by a first bolt 60, and the pressing ring 50 and the connecting sleeve 10 can be controlled to move toward each other. The pressing ring 50 can squeeze the sealing ring 40 in the step hole of the connecting sleeve 10 to deform it radially, so that the sealing ring 40 can fit tightly with the outer pipe wall of the pipe A to be connected to form a sealing fit. After confirming that the sealing ring 40 and the pipe A to be connected form an effective sealing match, and limiting the sealing assembly of the connecting sleeve 10 and the pressing ring 50 from moving toward or away from each other, the relative positions of the connecting sleeve 10 and the pressing ring 50 are fixed to form a rigid integral structure, and then the pressing sleeve 20 is connected and pre-tightened with the connecting sleeve 10 and / or the pressing ring 50 by the second bolt 70, so that the pressing ring 50 presses against the locking ring 30 in the tapered hole inside the pressing sleeve 20, so that the locking ring 30 is effectively clamped on the pipe A to be connected to prevent the pipe connector from naturally separating from the pipe A to be connected. The pre-tightening adjustment of the sealing ring 40 and the pre-tightening adjustment of the locking ring 30 are completed independently of each other, ensuring the reliability of the sealing and anti-detachment of the pipe connector. The connection between the pipe connector and the pipe A to be connected is completed in sequence, and the pipe connector is arranged on the other pipe A to be connected in the same way. The two pipe connectors are connected through the connecting flange 12 at the end of the connecting sleeve 10 to connect the two pipes A to be connected.

[0025] Among them, since the pre-tightening of the locking ring 30 depends on the squeezing effect of the pressing sleeve 20 and the pressing ring 50 on it, the above-mentioned arrangement prevents the connecting sleeve 10 and the pressing ring 50 from displacing relative to each other, thereby avoiding the situation in which the pressing ring 50 moves toward the connecting sleeve 10, causing the pressing ring 50 and the locking ring 30 to become loose, resulting in the locking ring 30 being unable to effectively hold the pipe A to be connected.

[0026] Furthermore, in order to facilitate the interconnection of the connecting sleeve 10, the pressing sleeve 20 and the pressing ring 50, annular connecting sleeve connecting ears 11, pressing sleeve connecting ears 21 and pressing ring connecting ears 51 are arranged at circumferential intervals on the outer circumferential surfaces of the connecting sleeve 10, the pressing sleeve 20 and the pressing ring 50, and the first bolt 60 is inserted into the connecting holes of the connecting sleeve connecting ears 11 and the pressing ring connecting ears 51 corresponding to the circumferential position, and the second bolt 70 is inserted into the connecting holes of the connecting sleeve connecting ears 11 and / or the pressing ring connecting ears 51 and the pressing sleeve connecting ears 21 corresponding to the circumferential position.

[0027] As a preferred solution, a nut is connected to the bolt body of the first bolt 60 to form a connection cooperation that limits the connection sleeve 10 and the pressure ring 50 to move closer or farther away from each other, and a nut is connected to the threaded end of the second bolt 70 to form a connection cooperation that limits the assembly composed of the connection sleeve 10 and the pressure ring 50 and the pressure sleeve 20 to move away from each other. The first bolt 60 and the second bolt 70 cooperate with the corresponding nuts to ensure that the relative positions of the connection sleeve 10, the pressure sleeve 20, and the pressure ring 50 are stable.

[0028] In this embodiment, at least one of the connection holes on the connecting sleeve connecting ear 11 and the pressing ring connecting ear 51 among the connecting sleeve connecting ear 11, the pressing sleeve connecting ear 21, and the pressing ring connecting ear 51 is a plain hole, and the other connection holes are threaded holes or plain holes. Depending on the location and number of the plain holes and the direction in which the bolts are inserted, the connection methods among the connecting sleeve 10, the pressing ring 50, and the pressing sleeve 20 are also different.

[0029] Considering that if the connection holes on the two connecting ears to be connected are both threaded holes, the two cannot be effectively connected by bolts, the following describes in detail the connection situation in which the connection hole on the pressing sleeve connecting ear 21 is a threaded hole and only one of the connection holes of the connecting sleeve connecting ear 11 and the pressing ring connecting ear 51 is a bare hole:

[0030] First, combine Figure 1 , 2 As shown in , 6, the connecting hole on the pressing ring connecting ear 51 is a smooth hole, and the connecting holes on the connecting sleeve connecting ear 11 and the pressing sleeve connecting ear 21 are both threaded holes. The first bolt 60 is sequentially passed through the threaded hole on the connecting sleeve connecting ear 11 and the smooth hole on the pressing ring connecting ear 51 and forms a threaded fit with the threaded hole of the connecting sleeve connecting ear 11. Two locking nuts 62 are arranged at both ends of the smooth hole on the pressing ring connecting ear 51 on the first bolt 60, and the second bolt 70 connects the pressing ring 50 and the pressing sleeve 20.

[0031] In this method, the first bolt 60 is inserted from the connecting sleeve connecting ear 11 to the pressing ring connecting ear 51, and the first bolt 60 and the threaded hole of the connecting sleeve connecting ear 11 form a threaded fit, and the two are relatively locked and will not slide freely in the axial direction of the pipe A to be connected, forming a rigid overall structure. Under this premise, two locking nuts 62 are placed at both ends of the light hole on the pressing ring connecting ear 51 on the first bolt 60, and the two locking nuts 62 are clamped on the opposite side end faces of the pressing ring connecting ear 51, which can limit the pressing ring connecting ear 51 on both sides, thereby ensuring that there is no relative displacement between the pressing ring 50 and the connecting sleeve 10, ensuring that the sealing ring 40 will not be over-extruded by the pressing ring 50 and cause excessive deformation, and also avoiding the situation where the pressing ring 50 slides toward the connecting sleeve and causes the locking ring 30 to loosen.

[0032] Second, combine Figure 4 , 5 As shown in , 7, the connecting hole on the pressing ring connecting ear 51 is a smooth hole, and the connecting holes on the connecting sleeve connecting ear 11 and the pressing sleeve connecting ear 21 are both threaded holes. The first bolt 60 passes through the smooth hole on the pressing ring connecting ear 51 and forms a threaded fit with the threaded hole of the connecting sleeve connecting ear 11. The locking nut 62 and the bolt head 61 are respectively arranged at both ends of the connecting hole on the pressing ring connecting ear 51, and the second bolt 70 connects the pressing ring 50 and the pressing sleeve 20.

[0033] In this mode, the difference from the first embodiment is that the first bolt 60 is inserted from the pressure ring connecting ear 51 to the connecting sleeve connecting ear 11, and the first bolt 60 and the threaded hole of the connecting sleeve connecting ear 11 form a threaded fit, and the two are relatively locked and will not slide freely in the axial direction of the pipe A to be connected, forming a rigid integral structure. Under this premise, only one locking nut 62 is set on the first bolt 60, and the locking nut 62 cooperates with the bolt head 61 to clamp against the opposite side end surface of the pressure ring connecting ear 51, and the pressure ring connecting ear 51 is limited on both sides, so as to ensure that there is no relative displacement between the pressure ring 50 and the connecting sleeve 10, and ensure that the sealing ring 40 will not be over-extruded by the pressure ring 50 and cause excessive deformation, and at the same time, it also avoids the situation where the pressure ring 50 slides toward the connecting sleeve and causes the locking ring 30 to loosen.

[0034] Third, combine Figure 8 As shown, the connecting hole on the connecting ear 11 of the connecting sleeve is a smooth hole, and the connecting holes on the pressing ring connecting ear 51 and the pressing sleeve connecting ear 21 are threaded holes. The first bolt 60 passes through the smooth hole on the connecting ear 11 of the connecting sleeve and forms a threaded fit with the threaded hole of the pressing ring connecting ear 51. The locking nut 62 and the bolt head 61 are respectively disposed at both ends of the connecting hole on the connecting ear 11 of the connecting sleeve, and the second bolt 70 connects the pressing sleeve 20 and the connecting sleeve 10.

[0035] In this embodiment, the difference from the previous two embodiments is that the connection hole on the connecting ear 11 of the connecting sleeve is a smooth hole and the first bolt 60 is inserted from the connecting ear 11 of the connecting sleeve to the pressing ring connecting ear 51. The first bolt 60 and the threaded hole of the pressing ring connecting ear 51 form a threaded fit, and the two are relatively locked and will not slide freely in the axial direction of the pipe A to be connected, forming a rigid integral structure. Under this premise, only one locking nut 62 is set on the first bolt 60, and the locking nut 62 cooperates with the bolt head 61 to clamp against the opposite side end face of the connecting ear 11 of the connecting sleeve, limiting the relative displacement of the first bolt 60 and the connecting ear 11 of the connecting sleeve, thereby ensuring that there is no relative displacement between the pressing ring 50 and the connecting sleeve 10, ensuring that the sealing ring 40 will not be over-extruded by the pressing ring 50 and cause excessive deformation, and also avoiding the situation where the pressing ring 50 slides toward the connecting sleeve and causes the locking ring 30 to loosen.

[0036] Fourth, combine Fig. 9 As shown, the connecting hole on the connecting ear 11 of the connecting sleeve is a smooth hole, and the connecting holes on the pressing ring connecting ear 51 and the pressing sleeve connecting ear 21 are threaded holes. The first bolt 60 is sequentially passed through the threaded hole on the pressing ring connecting ear 51 and the smooth hole on the connecting ear 11 of the connecting sleeve and forms a threaded fit with the threaded hole of the pressing ring connecting ear 51. Two locking nuts 62 are arranged at both ends of the smooth hole on the connecting ear 11 of the connecting sleeve on the first bolt 60, and the second bolt 70 connects the pressing sleeve 20 and the connecting sleeve 10.

[0037] In this mode, the difference from the third embodiment is that the first bolt 60 is inserted from the pressure ring connecting ear 51 to the connecting ear 11 of the connecting sleeve. The first bolt 60 and the threaded hole of the pressure ring connecting ear 51 form a threaded fit, and the two are relatively locked and will not slide freely in the axial direction of the pipe A to be connected, forming a rigid integral structure. Under this premise, two locking nuts 62 are arranged on the first bolt 60, and the two locking nuts 62 are clamped on the opposite side end faces of the pressure ring connecting ear 51 to limit the relative displacement of the first bolt 60 and the connecting ear 11 of the connecting sleeve, thereby ensuring that there is no relative displacement between the pressure ring 50 and the connecting sleeve 10, ensuring that the sealing ring 40 will not be over-extruded by the pressure ring 50 and cause excessive deformation, and also avoiding the situation where the pressure ring 50 slides toward the connecting sleeve and causes the locking ring 30 to loosen.

[0038] In addition, combined Fig.10As shown, it is necessary to explain another situation: if the connection holes on the connecting ear 11 of the connecting sleeve and the connecting ear 51 of the pressing ring are both light holes, then three locking nuts 62 are connected to the bolt body of the first bolt 60, and the bolt head 61 of the first bolt 60 and one locking nut 62 are respectively placed at the two ends of the light hole on the connecting ear 11 of the connecting sleeve, and the other two locking nuts 62 are respectively placed at the two ends of the light hole of the pressing ring connecting ear 51. In this case, whether the first bolt 60 is passed from the connecting ear 11 of the connecting sleeve to the pressing ring connecting ear 51, or from the pressing ring connecting ear 51 to the connecting ear 11 of the connecting sleeve, three locking nuts 62 need to be connected to the first bolt 60 to cooperate with the bolt head 61 to clamp against the connecting ear 11 of the connecting sleeve and the pressing ring connecting ear 51 respectively, so that the connecting ear 11 of the connecting sleeve and the pressing ring connecting ear 51 can be relatively fixed with the first bolt 60, and the relative displacement of the three in the axial direction is limited, thereby ensuring that there is no relative displacement between the pressing ring 50 and the connecting sleeve 10, and ensuring that the locking ring 30 is effectively pre-tightened. In this embodiment, the second bolt 70 can connect the pressing sleeve 20 with the connecting sleeve 10 and / or the pressing ring 50 .

[0039] It should be noted here that, in addition to the above situation, if the connecting hole on the pressing sleeve connecting ear 21 is a smooth hole, and on the premise that at least one of the connecting holes on the pressing sleeve connecting ear 21 and the pressing ring connecting ear 51 is a smooth hole, at least two of the connecting holes of the connecting sleeve connecting ear 11, the pressing ring connecting ear 51 and the pressing sleeve connecting ear 21 are smooth holes, then there is no situation where both connecting ears to be connected are threaded holes, and the bolt connection method between the components composed of the pressing sleeve connecting ear 21 and the connecting sleeve connecting ear 11 and the pressing ring connecting ear 51 ensures that the pressing sleeve connecting ear 21 will not be far away from the connecting sleeve connecting ear 11 or the pressing ring connecting ear 51, and no further elaboration will be given here.

[0040] Combination Figure 1 As shown, an arc-shaped groove 22 is provided on the outer circumferential surface of the pressing sleeve 20 at a position corresponding to the first bolt 60, and the arc-shaped groove 22 and the first bolt 60 form an escape space, and the arc-shaped groove 22 passes through the opposite side of the pressing sleeve 20 along the axial direction of the first bolt 60, and the curvature center of the inner arc surface of the arc-shaped groove 22 is located on the side where the bolt core of the first bolt 60 is located. The arc-shaped groove 22 can accommodate the bolt body of the first bolt 60, so that the extension section of the first bolt 60 will not interfere with the pressing sleeve 20, thereby ensuring the reasonable connection between the connecting sleeve 10, the pressing ring 50, and the pressing sleeve 20.

[0041] It should be noted that when the second bolt 70 is used to connect the connecting sleeve 10 and / or the pressing ring 50 and the pressing sleeve 20, it is sufficient to consider the tendency of limiting the displacement of the connecting sleeve 10 and / or the pressing ring 50 and the pressing sleeve 20 away from each other, because the hole cavity of the pressing sleeve 20 that accommodates the locking ring 30 is a tapered hole. When the pressing ring 50 moves toward the side of the pressing sleeve 20, the bayonet-shaped locking ring 30 gradually shrinks in diameter and moves toward the small aperture end of the pressing sleeve 20. When the toothed or friction surface of the inner ring of the locking ring 30 clamps the pipe A to be connected, there is almost no displacement space between the pressing ring 50 and the pressing sleeve 20 to move closer to each other, thereby forming a rigid matching structure between the connecting sleeve 10 and / or the pressing ring 50 and the pressing sleeve 20. In addition, the shape of the locking ring 30 and the matching scheme of the tapered hole of the inner ring of the pressing sleeve 20 can be found in the relevant literature disclosed in the background technology section.

Claims

1. A pipe connector, comprising a connecting sleeve (10), a pressure ring (50) and a pressing sleeve (20) which are sequentially sleeved on the pipe end section of the pipe (A) to be connected along the pipe length direction, a connecting flange (12) at one end of the connecting sleeve (10) is located at the pipe end of the pipe (A) to be connected, the other end of the connecting sleeve (10) is a step hole and one end of the pressing ring (50) is located at the orifice of the step hole, a sealing ring (40) is placed in an annular cavity surrounded by the step hole of the connecting sleeve (10), the outer wall of the pipe (A) to be connected and the end face of the pressing ring (50), and a locking ring (30) is arranged in an annular cavity surrounded by the pressing sleeve (20), the outer wall of the pipe (A) to be connected and the end face of the pressing ring (50), and characterized in that: The connecting sleeve (10) and the pressing ring (50) are connected by a first bolt (60) to form a sealing assembly that limits the connecting sleeve (10) and the pressing ring (50) from moving toward or away from each other. After that, the connecting sleeve (10) and / or the pressing ring (50) and the pressing sleeve (20) in the sealing assembly are connected by a second bolt (70).

2. The pipe connector according to claim 1, characterized in that: Annular connecting sleeve connecting ears (11), pressing sleeve connecting ears (21) and pressing ring connecting ears (51) are arranged at circumferential intervals on the outer circumferential surfaces of the connecting sleeve (10), the pressing sleeve (20) and the pressing ring (50), respectively; a first bolt (60) is inserted into the connecting holes of the connecting sleeve connecting ears (11) and the pressing ring connecting ears (51) corresponding to each other in the circumferential direction; and a second bolt (70) is inserted into the connecting holes of the connecting sleeve connecting ears (11) and / or the pressing ring connecting ears (51) and the pressing sleeve connecting ears (21) corresponding to each other in the circumferential direction.

3. The pipe connector according to claim 2, characterized in that: A nut is connected to the bolt body of the first bolt (60) to form a connection fit that limits the connection sleeve (10) and the pressure ring (50) from moving closer to or farther away from each other, and a nut is connected to the threaded end of the second bolt (70) to form a connection fit that limits the assembly consisting of the connection sleeve (10) and the pressure ring (50) and the pressure sleeve (20) from moving away from each other.

4. The pipe connector according to claim 3, characterized in that: Among the connecting sleeve connecting ear (11), the pressing sleeve connecting ear (21) and the pressing ring connecting ear (51), at least one of the connecting holes on the connecting sleeve connecting ear (11) and the pressing ring connecting ear (51) is a plain hole, and the other connecting holes are threaded holes or plain holes.

5. The pipe connector according to claim 4, characterized in that: The connection hole on the pressing ring connecting ear (51) is a smooth hole, and the connection holes on the connecting sleeve connecting ear (11) and the pressing sleeve connecting ear (21) are both threaded holes. The first bolt (60) is sequentially inserted through the threaded hole on the connecting sleeve connecting ear (11), the smooth hole on the pressing ring connecting ear (51) and forms a threaded fit with the threaded hole of the connecting sleeve connecting ear (11). Two locking nuts (62) are arranged at both ends of the smooth hole on the pressing ring connecting ear (51) on the first bolt (60). The second bolt (70) connects the pressing ring (50) and the pressing sleeve (20).

6. The pipe connector according to claim 3, characterized in that: The connecting hole on the pressing ring connecting ear (51) is a smooth hole, and the connecting holes on the connecting sleeve connecting ear (11) and the pressing sleeve connecting ear (21) are both threaded holes. The first bolt (60) passes through the smooth hole on the pressing ring connecting ear (51) and forms a threaded fit with the threaded hole of the connecting sleeve connecting ear (11). The locking nut (62) and the bolt head (61) are respectively arranged at two ends of the connecting hole on the pressing ring connecting ear (51). The second bolt (70) connects the pressing ring (50) and the pressing sleeve (20).

7. The pipe connector according to claim 3, characterized in that: The connecting hole on the connecting ear (11) of the connecting sleeve is a smooth hole, and the connecting holes on the pressing ring connecting ear (51) and the pressing sleeve connecting ear (21) are threaded holes. The first bolt (60) passes through the smooth hole on the connecting ear (11) of the connecting sleeve and forms a threaded fit with the threaded hole of the pressing ring connecting ear (51). The locking nut (62) and the bolt head (61) are respectively arranged at two ends of the connecting hole on the connecting ear (11) of the connecting sleeve. The second bolt (70) connects the pressing sleeve (20) and the connecting sleeve (10).

8. The pipe connector according to claim 3, characterized in that: The connecting hole on the connecting ear (11) of the connecting sleeve is a smooth hole, and the connecting holes on the pressing ring connecting ear (51) and the pressing sleeve connecting ear (21) are threaded holes. The first bolt (60) is sequentially inserted through the threaded hole on the pressing ring connecting ear (51) and the smooth hole on the connecting ear (11) of the connecting sleeve and forms a threaded fit with the threaded hole of the pressing ring connecting ear (51). Two locking nuts (62) are arranged at both ends of the smooth hole on the connecting ear (11) of the connecting sleeve on the first bolt (60). The second bolt (70) connects the pressing sleeve (20) and the connecting sleeve (10).

9. The pipe connector according to claim 3, characterized in that: The connection holes on the connecting ear (11) of the connecting sleeve and the connecting ear (51) of the pressing ring are both smooth holes. Three locking nuts (62) are connected to the bolt body of the first bolt (60). The bolt head (61) of the first bolt (60) and a locking nut (62) are respectively arranged at the two ends of the smooth hole on the connecting ear (11) of the connecting sleeve, and the other two locking nuts (62) are respectively arranged at the two ends of the smooth hole of the pressing ring connecting ear (51).

10. The pipe connector according to claim 1, characterized in that: An arc-shaped groove (22) is provided on the outer circumferential surface of the pressing sleeve (20) at a position corresponding to the first bolt (60), and the arc-shaped groove (22) and the first bolt (60) form an escape space. The arc-shaped groove (22) penetrates the opposite side of the pressing sleeve (20) along the axial direction of the first bolt (60), and the curvature center of the inner arc surface of the arc-shaped groove (22) is located on the side where the bolt core of the first bolt (60) is located.

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