CN216382948U

CN216382948U - Pipeline butt joint external member and pipeline butt joint structure

Info

Publication number: CN216382948U
Application number: CN202122139324.1U
Authority: CN
Inventors: 贺忠臣; 李运龙; 康彩荣; 肖锐; 陈祥; 孟宪虎
Original assignee: Jiangsu Zhongxin Pipe Technology Co ltd
Current assignee: Jiangsu Zhongxin Pipe Technology Co ltd
Priority date: 2021-04-26
Filing date: 2021-09-06
Publication date: 2022-04-26
Anticipated expiration: 2031-09-06
Also published as: CN113738966A; CN216430778U; CN112984241A

Abstract

The utility model discloses a pipeline butt joint external member and a pipeline butt joint structure. The pipeline butt joint external member mainly comprises a pipe end sleeve. The pipe end sleeve comprises an inner support body, an outer support body and an end sealing disc. The inner support body and the outer support body are both circular ring bodies, and the outer diameter of the inner support body is smaller than that of the outer support body. The end parts of the inner support body and the outer support body are connected through an end sealing disc, so that a pipeline groove with a U-shaped structure is formed between the inner support body and the outer support body. When the pipe end sleeve is used for butt joint of pipelines, the end part of the pipe body of the butted pipeline is clamped into the pipeline groove, so that the end face of the pipe body is coated by the pipe end sleeve, and the end face notch of the end part of the pipe body is prevented from contacting liquid flowing in the pipeline by matching with sealing of the sealing ring, so that the problem that the end face notch of the end part of the pipeline is corroded is solved.

Description

Pipeline butt joint external member and pipeline butt joint structure

Technical Field

The utility model relates to an inter-pipe butt joint structure.

Background

In order to improve the quality of drinking water and prevent elements harmful to human bodies from entering the drinking water and damaging human health due to the fact that water corrodes the inner wall of a metal pipe for a long time, the metal composite water delivery pipeline is widely applied. At present, the reinforced stainless steel pipes (or the inner lining stainless steel composite pipes or the steel-plastic composite pipes) with the nominal size not less than DN50 are connected by a groove hoop connection mode. The connection mode is safe and reliable, and has simple construction and low construction cost. However, lined stainless steel composite steel pipes or reinforced stainless steel pipes are a new type of composite steel pipe. The direct connected mode that adopts traditional slot clamp can't stop its terminal surface and carry medium water contact, and its terminal surface leads to the fact the corruption with carry medium water contact back, and the terminal surface pollutes the drinking water to lead to the sanitary condition of drinking water unqualified, simultaneously, the corruption can cause the accident of leaking, shortens composite pipeline's life greatly. The same problem exists when other metal composite pipes are connected by grooves.

Disclosure of Invention

The problems to be solved by the utility model are as follows: in order to avoid the problem that the end face notch of the pipe end is corroded when the pipelines are butted.

In order to solve the problems, the utility model adopts the following scheme:

the pipeline butt joint external member comprises a pipe end sleeve, a hoop and a first sealing ring; the pipe end sleeve is arranged at the end part of the butted pipe body and comprises an inner support body, an outer support body and an end sealing disc, wherein the inner support body is used for being attached to the inner surface of the butted pipe body, the outer support body is used for being attached to the outer surface of the butted pipe body, and the end sealing disc is connected with the inner support body and the outer support body; the inner support body and the outer support body are both circular ring bodies, and the outer diameter of the inner support body is smaller than that of the outer support body; the end parts of the inner support body and the outer support body are connected through an end sealing disc, so that a pipeline groove with a U-shaped structure is formed between the inner support body and the outer support body; the pipeline groove is used for being clamped by the end part of the butt joint pipeline body; the clamp is used for being clamped between the pipe bodies of two butted pipelines when the pipe bodies of the butted pipelines are butted, and coating an outer sleeve body of the pipe end sleeve, and comprises an inner side groove; the first sealing ring is arranged in the groove and clamped on the outer sleeve body, and the two butted pipeline bodies are sealed.

Further, according to the pipe butting assembly of the present invention, the pipe end sleeves are made of metal or alloy.

Further, according to the pipe butting kit, the first sealing ring comprises a balance cavity; the balance cavity is coated by a skin layer to form an annular structure; a notch is arranged in the middle of the inner side of the balance cavity; two sides of the notch are provided with annular skin pressing plates; the skin layer pressing plate is used for pressing and holding the outer sleeve body.

Further, according to the pipe butting assembly of the utility model, the axial length of the outer sleeve body satisfies the following condition: w5 ÷ 2> L2> (W5-4 XH-W6 max) ÷ 2; wherein, L2 is the axial length of the outer sleeve, W5 is the groove width of the groove, H is the thickness of the first seal ring skin, and W6max is the maximum value allowed by the width of the joint between two butted pipelines when the two butted pipelines are butted.

Further, the pipeline butt joint kit further comprises a second sealing ring; an annular sealing groove is formed in the outer cylindrical surface of the inner support body; the second sealing ring is used for being arranged in the sealing groove.

Further, according to the pipe butting sleeve assembly, the sealing grooves are provided with a plurality of channels.

Further, according to the pipe butting kit of the utility model, the axial length of the inner support body is greater than that of the outer support body, so that the inner support body is provided with a convex part which axially protrudes out of the outer support body; the seal groove is arranged on the bulge.

Further, according to the pipe butt joint kit, the width W2 of the sealing groove is 3.0-20.0 mm.

Further, according to the pipe butting kit, the first sealing ring comprises a balance cavity; the balance cavity is coated by a skin layer to form an annular structure; a notch is arranged in the middle of the inner side of the balance cavity; two sides of the notch are provided with annular skin pressing plates; the skin layer pressing plate is used for pressing and holding the outer sleeve body; the axial distance between the sealing groove and the outer sleeve body is less than 2 multiplied by H; wherein H is the thickness of the first sealing ring skin layer.

Further, according to the pipeline butt joint kit, the sealing groove is formed by combining a plurality of groove bodies.

The pipeline butt joint structure comprises a clamp, a first sealing ring and two pipe bodies of two butted pipelines; the end parts of the butt joint ends of the pipe bodies of the two butted pipelines are respectively provided with a pipe end sleeve; the pipe end sleeve comprises an inner support body, an outer support body and an end sealing disc; the inner support body and the outer support body are both circular ring bodies, and the outer diameter of the inner support body is smaller than that of the outer support body; the end parts of the inner support body and the outer support body are connected through an end sealing disc, so that a pipeline groove with a U-shaped structure is formed between the inner support body and the outer support body; the end part of the pipe body of the butted pipe is clamped into the pipe groove, the end surface of the pipe body is coated by the pipe end sleeve, the inner support body is attached to the inner surface of the pipe body of the butted pipe, and the outer support body is attached to the outer surface of the pipe body of the butted pipe; a clamping groove is formed in the end part of the pipe body; the clamp comprises a groove on the inner side; the edge parts of the two sides of the groove are respectively clamped in the clamping grooves on the pipe bodies of the two butted pipelines, so that the outer sleeve body is coated by the clamping hoop; the first sealing ring is arranged in the groove and clamped between the clamp and the outer sleeve body.

Further, according to the pipe butting structure of the utility model, the pipe end fitting is made of metal or alloy.

Further, according to the pipe butting structure of the present invention, the first seal ring includes a balance chamber; the balance cavity is coated by a skin layer to form an annular structure; a notch is arranged in the middle of the inner side of the balance cavity; two sides of the notch are provided with annular skin pressing plates; the notch is opposite to the joint between the two butted pipelines; the leather layer pressing plate is pressed and held on the outer sleeve body.

Further, according to the pipe butt joint structure of the present invention, the axial length of the outer sleeve satisfies the following condition: w5 ÷ 2> L2> (W5-4 XH-W6 max) ÷ 2; wherein, L2 is the axial length of the outer sleeve body, W5 is the groove width of the groove, H is the thickness of the first sealing ring skin layer, and W6max is the maximum value allowed by the seam width W6.

Further, the pipeline butt joint structure further comprises a second sealing ring; an annular sealing groove is formed in the outer cylindrical surface of the inner support body; the second sealing ring is arranged in the sealing groove.

Further, according to the pipe butt joint structure of the present invention, the sealing groove has a plurality of grooves.

Further, according to the pipe butting structure of the utility model, the axial length of the inner support body is greater than that of the outer support body, so that the inner support body is provided with a convex part which axially protrudes out of the outer support body; the seal groove is arranged on the bulge.

Further, according to the pipeline butt joint structure, the clamping groove is formed by rolling, and when the clamping groove is rolled, the pipe body is inwards sunken to form an inner convex part inside the pipe body; the inner projection snaps into the seal groove.

Further, according to the pipeline butt joint structure, the width W2 of the sealing groove is 3.0-20.0 mm.

Further, according to the pipe butting structure of the present invention, the first seal ring includes a balance chamber; the balance cavity is coated by a skin layer to form an annular structure; a notch is arranged in the middle of the inner side of the balance cavity; two sides of the notch are provided with annular skin pressing plates; the notch is opposite to the joint between the two butted pipelines; the leather layer pressing plate is pressed on the outer sleeve body; the axial distance between the sealing groove and the outer sleeve body is less than 2 multiplied by H; wherein H is the thickness of the first sealing ring skin layer.

Furthermore, the pipeline butt joint structure is formed by combining a plurality of grooves; and a second sealing ring is arranged in each groove body.

The utility model has the following technical effects: the pipe end sleeve can be sleeved at the pipe end of a butted pipeline, so that the end surface cut of the end part of the pipe body is prevented from contacting liquid flowing in the pipeline, and the problem that the end surface cut of the end part of the pipeline is corroded is solved.

Drawings

Fig. 1 is a schematic structural view of an embodiment of the pipe butt joint structure of the present invention.

Fig. 2 is an enlarged view of a dotted circle portion in fig. 1.

Fig. 3 and 4 are schematic perspective views of two different viewing angles of an embodiment of a pipe end sleeve.

Figure 5 is a tube end sleeve component dimension definition diagram.

Fig. 6 is a diagram of the dimensions of the components of fig. 2.

Fig. 7 is a schematic structural view of another embodiment of the pipe butt joint structure according to the present invention.

Fig. 8 is a schematic half-sectional perspective view of the first seal ring.

FIG. 9 is a schematic structural diagram of a four-tube end sleeve of an embodiment.

FIG. 10 is a schematic diagram of the structure of the four-pipe end socket of the embodiment installed on the butted pipes.

In each of the above-described figures,

1 is a pipe end sleeve, 11 is an inner support body, 111 is a sealing groove, 1111 is a first sealing groove, 1112 is a second sealing groove, 11P is a convex part, 12 is an outer sleeve body, 13 is an end sealing disc, 14 is a pipeline groove, 15 is a pipe cavity, 2 is a hoop, 21 is a groove, 22 is an edge part, 3 is a first sealing ring, 31 is a balance cavity, 32 is a notch, 33 is a skin pressing plate, 33P is a state that the skin pressing plate is tilted, 4 is a second sealing ring, 5 is a pipe body of a butted pipeline, 51 is a clamping groove, 52 is an inner convex part, and 6 is a joint;

l1 is the axial length of the inner support, L2 is the axial length of the outer sleeve, L3 is the axial length of the protrusion, L4 is the axial distance between the seal groove and the outer sleeve, W1 is the width of the duct groove, W2 is the width of the seal groove, W3 is the width of the slot, W4 is the width of the clamp edge, W5 is the width of the groove, W6 is the width of the seam, D is the width of the gap between the clamp edge and the outer sleeve, and H is the thickness of the first seal ring skin.

In the above figures, the broken line in the radial direction indicates that the radial dimension of the actual product is generally larger than that in the figures, and the radial dimension in the figures cannot be compared with other dimensions in the figures.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example one

The embodiment is a pipeline butt joint structure, and referring to fig. 1 and 2, the pipeline butt joint structure includes a clamp 2, a first sealing ring 3, two pipe bodies 5 of butted pipelines, and two pipe end sleeves 1. The two pipe end sleeves 1 are respectively sleeved at the end parts of the pipe bodies 5 of the two butted pipelines and used for protecting the end surfaces of the end parts of the pipe bodies 5.

Referring to fig. 3, 4 and 5, the pipe end fitting 1 comprises an inner support 11, an outer sleeve 12 and an end sealing disc 13. The inner support 11 and the outer support 12 are both circular rings. The ends of the inner support 11 and the outer support 12 are connected by an end sealing disc 13, so that the inner support 11, the outer support 12 and the end sealing disc 13 are connected into an integrated structure. In this integrated structure, the inner frame 11, the outer frame 12 and the end seal disk 13 are coaxial, and a lumen 15 formed by the inner frame 11 is provided in the middle. The integral structure is made entirely of metal or alloy, in particular hard metal or hard alloy, preferably stainless steel or copper. The outer diameter of the inner support body 11 is smaller than that of the outer support body 12, so that a U-shaped channel 14 is formed between the inner support body 11 and the outer support body 12. The ducting trough 14 is an annular U-shaped trough and is open in the axial direction. The pipe end sleeve 1 is sleeved on the end part of the pipe body 5 of the butted pipeline, so that the end part of the pipe body 5 is covered by the inner support body 11, the outer support body 12 and the end sealing disc 13 of the pipe end sleeve 1. Therefore, the end part of the pipe body 5 is coated by the pipe end sleeve 1, so that the contact of the fluid in the butted pipeline with the end part end face of the butted pipeline pipe body 5 can be avoided, and the problem that the end part end face of the pipe body 5 is corroded is also avoided. More specifically, the inner support 11 is attached to the inner surface of the pipe 5, and the outer support 12 is attached to the outer surface of the pipe 5. The end body of the butted conduit pipe body 5 is snapped into the conduit groove 14. When the end body of the butted pipe body 5 is snapped into the pipe groove 14, the end face of the butted pipe body 5 is usually abutted against the end seal disk 13. Those skilled in the art will appreciate that the end face of the butt pipe body 5 may not abut against the end closing disk 13. Further, with the above-described structure, it is easy to see that the width W1 of the pipe groove 51 should match the wall thickness of the butted pipe body 5.

The end of the tube 5 is provided with a locking groove 51. The clamp 2 is a grooved clamp, i.e. the clamp 2 comprises an inner groove 21. The edge portions 22 on both sides of the groove 21 are respectively clamped in the clamping grooves 51 of the pipe bodies 5 of two butted pipes, so that the clamping hoop 2 covers the outer sleeve 12. The first seal ring 3 is disposed in the groove 21 and clamped between the clamp 2 and the outer sleeve 12.

The pipe docking structure of this embodiment is a copy-in pipe docking structure, that is, a certain degree of axial movement is allowed between two pipes to be docked. In particular, in the above-described configuration, i.e. between the ends of the tubular bodies 5 of the two pipes to be butted, a seam 6 is left, and a certain width of the seam 6 is allowed. That is, referring to fig. 6, the width W6 of the seam 6 may be greater than zero. Correspondingly, the first sealing ring 3 is a bellows-type sealing ring. That is, referring to fig. 8, the first seal ring 3 has an annular balance chamber 31. The balance cavity 31 is a ring-shaped structure formed by coating a skin layer. A notch 32 is arranged in the middle of the inner side of the balance cavity 31. The notches 32 are flanked by annular skin hold-downs 33. The notch 32 is opposite the seam 6. The leather pressing plates 33 on both sides of the notch 32 are pressed on the outer sleeve body 12. The sealing principle of the pipeline butt joint structure is as follows: if fluid is present in the duct, it enters the balancing chamber 31 through the seam 6 and the slot 32. The skin pressing plates 33 on the two sides of the notch 32 are attached to the outer sleeve body 12 under the action of fluid pressure, so that the two butted pipeline pipe bodies are sealed. Of course, it will be understood by those skilled in the art that the width W6 of the seam 6 may also be 0, in which case the end sealing discs 13 of two pipe end caps 1 disposed at the ends of two butted pipe bodies 5 abut against each other. In this case, the end faces of the pipe ends which are butted are naturally sealed.

Further, in order to prevent the fluid in the pipeline from flowing out through the gap between the pipe end sleeve 1 and the pipe body 5, a second sealing ring 4 can be arranged between the pipe end sleeve 1 and the pipe body 5. Specifically, in the present embodiment, in order to facilitate the arrangement of the second sealing ring 4, an annular sealing groove 111 is arranged on the outer cylindrical surface of the inner supporter 11 in the present embodiment. The seal groove 111 is provided with the second seal ring 4. The sealing groove 111 may be formed by rolling with a rolling mill, by machining with a milling machine, or by casting and demolding. The structural shape of the cross section is not limited. During installation or assembly, the second sealing ring 4 is firstly clamped into the sealing groove 111, and then the pipe end sleeve 1 with the second sealing ring 4 is clamped with the pipe body 5.

Further, in order to improve the sealing effect of the second gasket 4, the engaging groove 51 at the end of the pipe body 5 of the butted pipe is formed by rolling with a rolling machine. The position of the catching groove 51 corresponds to the position of the seal groove 111. After the pipe end sleeve 1 and the pipe body 5 are clamped, the clamping groove 51 is rolled by the groove rolling machine, so that the pipe body 5 is inwards sunken to form an inner convex part 52 inside the pipe body, the inner convex part 52 is pressed into the sealing groove 111, and the second sealing ring 4 arranged in the sealing groove 111 is compressed. Meanwhile, the pipe end sleeve 1 is clamped into the inner convex part 52 in the sealing groove 111 to be clamped at the end part of the butted pipeline 5, so that the fixed connection between the pipe end sleeve 1 and the butted pipeline pipe body 5 is realized.

To achieve the above-described connection structure, it is obviously required that the axial length of the inner support body 11 is longer than that of the outer support body 12. That is, referring to fig. 5, the axial length L1 of the inner support 11 is greater than the axial length L2 of the outer sleeve 12 such that the inner support 11 has a projection 11P projecting axially from the outer sleeve 12. The axial length of the projection 11P is L3. Obviously, L1= L2+ L3. The seal groove 111 is provided in the projection 11P.

In addition, since the pipe butt joint structure of the present embodiment adopts the copy type butt joint structure, a certain degree of axial displacement is allowed between the two pipe bodies 5 to be butted after the pipe bodies are butted, and therefore, the width W3 of the clamping groove 51 is required to be larger than the width W4 of the side portions on both sides of the groove of the clip 2. While the width W2 of the sealing groove 111 obviously needs to be not smaller than the width W4 of the card slot 51. That is, the sealing groove 111 is required to have a certain width, and generally, the width W2 is required to be not less than 3.0 mm. On the other hand, the axial displacement allowed between the two butted pipe bodies 5 after the butting cannot be too large, which requires that the width W3 of the slot 51 cannot be too wide, and the width W2 of the corresponding sealing groove 111 cannot be too wide. The width W2 of the sealing groove 111 is generally required not to exceed 20.0 mm. That is, the width W2 of the sealing groove 111 is preferably 3.0 to 20.0 mm.

Of course, those skilled in the art will understand that the locking groove 51 may also be formed by milling, and at this time, the corresponding position of the inner wall of the locking groove 51 will not be recessed inwards, and will not compress the second sealing ring 4. In this case, the second sealing ring 4 may be in interference fit with the inner wall of the butted pipeline 5. For example, in the structure illustrated with reference to fig. 7, the tube wall of the tube body 5 is thick, the slot 51 is formed by machining with a milling machine, and the inner side of the tube wall corresponding to the slot 51 does not protrude inward. When the pipe end sleeve 1 is installed to the end part of the pipe body 5, the pipe end sleeve 1, the pipe body 5 and the second sealing ring 4 are fixed to each other in the pipe cavity of the pipe body 5 in a mode of interference fit through the inner supporting body 11 and the second sealing ring 4.

Further, in the above embodiment, the outer casing 12 is attached to the outer surface of the pipe body 5, so that a stepped structure is formed between the outer casing 12 and the pipe body 5. In the case of a small axial length L2 of the outer jacket 12, i.e. with reference to fig. 6, a gap width D exists between the edge 22 of the clip 2 and the outer jacket 12. The skin press plate 33 of the first gasket 3 is partially attached to the outer surface of the pipe body 5. Due to the stepped structure between the outer jacket 12 and the pipe body 5, the skin laminate 33 is easily caused to tilt, referring to the state of the skin laminate 33 indicated by the dotted line portion indicated by reference numeral 33P illustrated in fig. 6. Obviously, in this case, the skin press plate 33 cannot be attached to the outer casing 12, and there is a possibility of leakage of the seal of the first seal ring 3.

To avoid this problem, it is desirable that the gap width D between the edge 22 of the clamp 2 and the outer sleeve 12 is as small as possible, for example, in the structure illustrated in fig. 7, the gap width D between the edge 22 and the outer sleeve 12 is small enough that the skin clamp 33 of the first seal ring 3 cannot be clamped into the gap between the edge 22 and the outer sleeve 12. In order to prevent the skin press plate 33 of the first seal ring 3 from being jammed into the gap between the edge portion 22 and the outer sleeve 12, the gap width D is required to satisfy the condition: d < 2 XH. Where H is the skin thickness of the first seal ring 3. On the other hand, according to fig. 6, the width W5 of the groove 21 and the axial length L2 of the outer sleeve 12 have the following relationship: w5 ═ 2 xl 2+ W6 + 2 xd. That is, L2 ═ (W5-W6-2 xd) ÷ 2. Since the gap width needs to satisfy the condition: d < 2 XH, therefore, L2 needs to satisfy the condition: l2> (W5-W6-4 XH) ÷ 2. That is, the axial length L2 of the outer sleeve 12 needs to be long enough to make the gap width D between the side portion 22 and the outer sleeve 12 sufficiently small. In the above equation, W6 is variable as the width of the joint 6 between the ends of the pipe bodies 5 of the two pipes to be butted, and the maximum value W6max of the variable is substituted into the above equation. That is, the axial length L2 of the outer casing 12 needs to satisfy the condition: l2> (W5-W6 max-4 XH) ÷ 2.

The outer sleeve 12 is covered by the groove 21 of the clip 2, and therefore, obviously, the axial length L2 of the outer sleeve 12 should not be too long, and L2 should satisfy: l2 < W5 ÷ 2, that is, the axial length L2 of the outer casing 12 needs to satisfy the condition: w5 ÷ 2> L2> (W5-W6 max-4 XH) ÷ 2.

In addition, in the structures illustrated in fig. 1, 2, and 6, the position of the card slot 51 should correspond to the position of the seal groove 111. While the edge 22 of the clip 2 is engaged in the notch 51. Thus, if the axial length L2 of the outer casing 12 needs to satisfy the condition L2> (W5-W6 max-4 × H) ÷ 2, the axial distance L4 between the outer casing 12 and the seal groove 111 is sufficiently small. The axial distance L4 between the outer sleeve 12 and the sealing groove 111 corresponds to the gap width D between the edge 22 and the outer sleeve 12, so that the axial distance L4 between the outer sleeve 12 and the sealing groove 111 should satisfy the condition: l4 < 2 XH. Of course, those skilled in the art will appreciate that the location of the slot 51 in the structure illustrated in fig. 7 need not correspond to the location of the sealing groove 111, and need not satisfy the above conditions.

It should be noted that there may be multiple sealing grooves 111, for example, in the structures illustrated in fig. 1 and 2, one sealing groove 111 is formed on the inner support 11, and in the structures illustrated in fig. 3, 4, 5 and 7, there are two sealing grooves 111. Those skilled in the art will appreciate that the number of seal grooves may be set as desired. In the case of multiple sealing grooves 111, only one of the sealing grooves 111 needs to correspond to the slot 51, and the other sealing grooves 111 do not need to correspond to the slot 51.

Example two

The embodiment is a pipeline butt joint kit which is used for pipeline butt joint. The pipe butting assembly is composed of the pipe butting structure of the first embodiment except for the butted pipe bodies 5. The components can form the pipeline butt joint structure in the first embodiment when being applied to butt joint of pipe bodies of two butted pipelines.

EXAMPLE III

The present embodiment is a pipe docking method for assembling the pipe docking structure in the first embodiment, in particular, for assembling the pipe docking structure illustrated in fig. 1. The pipeline butt joint method comprises the following steps:

s1: sleeving the second sealing ring 4 into the sealing groove 111;

s2: the pipe end sleeve 1 sleeved with the second sealing ring 4 is clamped into the pipe end of the pipe body 5 of the butted pipeline, so that the end part of the pipe body 5 of the butted pipeline is clamped into the pipeline groove 14, the end face of the butted end of the pipe body 5 is coated by the pipe end sleeve 1, the inner support body 11 is attached to the inner surface of the pipe body 5 of the butted pipeline, and the outer support body 12 is attached to the outer surface of the pipe body 5 of the butted pipeline;

s3: the end part of the butted pipeline pipe body 5 passes through a rolling clamping groove 51 of a rolling machine, and when the clamping groove 51 is rolled, the end part is opposite to the sealing groove 111, so that the pipe body is inwards sunken to form an inner convex part 52 inside the pipe body, and the inner convex part is clamped into the sealing groove 111, and the second sealing ring 4 in the sealing groove 111 is compressed;

s4: sleeving the first sealing ring 3 into the pipe body 5 of one of the butted pipes, and after the pipe ends of the pipe bodies 5 of the two butted pipes are aligned, moving the first sealing ring 3 to a seam 6 between the pipe bodies 5 of the two butted pipes, and aligning the center of the first sealing ring 3 with the seam 6, so that the first sealing ring 3 is clamped on the outer sleeve body 12;

s5: buckling the two semicircular parts of the hoop 2 on the first sealing ring 3 to enable the first sealing ring 3 to be located in the groove 21 of the hoop 2, respectively clamping the edge parts 22 on two sides of the groove 21 in the clamping grooves 51 on the pipe bodies 5 of the two butted pipelines, and then fastening the two semicircular parts of the hoop 2 through bolts to complete the butting of the two butted pipelines.

In the above step S3, the engaging groove 51 is required to face the sealing groove 111, although the structure in the first embodiment does not require the end face of the butted end of the pipe 5 to abut against the end seal disc 13, in this embodiment, in order to facilitate rolling, the engaging groove 51 can face the sealing groove 111, and in the step S2, when the pipe end sleeve 1 is engaged with the pipe end of the butted pipe body 5, the end face of the butted end of the pipe body 5 can abut against the end seal disc 13.

Further, in the case where the first sealing ring 3 includes the balance cavity 31 covered by the skin layer, when the first sealing ring 3 moves to the seam 6 between the two pipe bodies 5 of the butted pipes in the step of S4, it should be ensured that the notch 32 faces the seam 6.

Further, in the case where the aforementioned axial length of the outer sleeve 12 satisfies the condition W5 ÷ 2> L2> W5-4 xh-W6 max ÷ 2, in the step of S3, the card groove 51 is rolled along the end of the outer sleeve 12 such that the edge of the card groove 51 is aligned with the outer sleeve 12 when the card groove 51 is rolled.

Example four

In the above embodiment, the sealing groove 111 of the inner support 11 of the pipe end sleeve 1 may be formed by rolling in a rolling machine. When the seal groove 111 is rolled by a notching press, the width W2 of the seal groove 111 generally correlates with the die size of the notching press. If the width W2 of the sealing groove 111 is much larger than the die size of the notching press, it is inconvenient to roll. For example, the width W2 of the sealing groove 111 is 3.0mm, and the die size of the grooving machine is 1.0 mm. In this case, the sealing groove 111 may be formed in an M-shape. Referring to the structure illustrated in fig. 9 and 10, the sealing groove 111 is divided into two: a first seal groove 1111 and a second seal groove 1112. The first sealing groove 1111 is formed by combining two grooves to form an M-shape. The two groove bodies are respectively provided with a second sealing ring 4. The width of each groove body is equal to the size of a die head of the grooving machine and is 1.5 mm. The entire width W2 of the seal groove 111 formed by combining the two groove bodies is 5.0 mm. When the inner convex part 52 is matched with the clamping groove 51 on the butted pipeline pipe body 5, the inner convex part 52 generated by rolling the clamping groove 51 is integrally clamped in the first sealing groove 1111, and the second sealing ring 4 in the two grooves is compressed.

In this embodiment, the second sealing groove 1112 is a small-sized sealing groove with a width of 0.8 mm. That is, in the present invention, when there are a plurality of sealing grooves 111, the width of each sealing groove 111 may be different from each other. The width W2 of the sealing groove 111 is preferably 3.0-20.0 mm, which is the width of the sealing groove 111 matching with the slot 51, and is not required for other sealing grooves 111.

In addition, according to the sealing groove 111 formed by combining two grooves, those skilled in the art will understand that the sealing groove 111 may also be formed by combining three or four grooves. When the sealing groove 111 is formed by combining a plurality of groove bodies, the second seal ring 4 is usually provided in each groove body.

Claims

1. The pipeline butt joint external member is characterized by comprising a pipe end sleeve (1), a clamp (2) and a first sealing ring (3); the pipe end sleeve (1) is arranged at the end part of the butted pipe body and comprises an inner support body (11) attached to the inner surface of the butted pipe body, an outer support body (12) attached to the outer surface of the butted pipe body and an end sealing disc (13) connected with the inner support body (11) and the outer support body (12); the inner support body (11) and the outer support body (12) are both circular ring bodies, and the outer diameter of the inner support body (11) is smaller than that of the outer support body (12); the end parts of the inner support body (11) and the outer support body (12) are connected through an end sealing disc (13), so that a pipeline groove (14) with a U-shaped structure is formed between the inner support body (11) and the outer support body (12); the pipeline groove (14) is used for being clamped by the end part of the butt joint pipeline; the clamp (2) is used for being clamped between two pipe bodies of a butted pipeline when the pipe bodies of the butted pipeline are butted, coating an outer sleeve body (12) of the pipe end sleeve and comprises an inner side groove (21); the first sealing ring (3) is arranged in the groove (21) and clamped on the outer sleeve body (12) to realize the sealing of the two butted pipeline pipe bodies.

2. A pipe docking kit according to claim 1, characterized in that the pipe end fitting (1) is made of metal or an alloy.

3. A pipe docking kit according to claim 1, characterized in that the first sealing ring (3) comprises a balancing cavity (31); the balance cavity (31) is coated by a skin layer to form an annular structure; a notch (32) is arranged in the middle of the inner side of the balance cavity (31); two sides of the notch (32) are provided with annular skin pressing plates (33); the skin layer pressing plate (33) is used for pressing and holding the outer sleeve body (12).

4. A pipe docking kit according to claim 3, wherein the axial length of the outer sleeve (12) satisfies the following condition: l2> (W5-4 XH-W6 max) ÷ 2; wherein L2 is the axial length of the outer sleeve (12), W5 is the groove width of the groove (21), H is the thickness of the skin of the first sealing ring (3), and W6max is the maximum value allowed by the width of a joint (6) between two butted pipelines when the two butted pipelines are butted.

5. The pipe docking kit according to claim 1 or 2 or 3 or 4, further comprising a second sealing ring (4); an annular sealing groove (111) is formed in the outer cylindrical surface of the inner support body (11); the second seal ring (4) is arranged in the seal groove (111).

6. The pipe docking kit of claim 5, wherein there are multiple sealing grooves (111).

7. The pipe docking kit according to claim 5, wherein the inner support (11) has a greater axial length than the outer support (12) such that the inner support (11) has a projection (11P) projecting axially from the outer support (12); the seal groove (111) is provided in the projection (11P).

8. The pipe docking kit according to claim 7, wherein the width W2 of the sealing groove (111) is 3.0-20.0 mm.

9. Pipe docking kit according to claim 7, characterized in that the first sealing ring (3) comprises a balancing cavity (31); the balance cavity (31) is coated by a skin layer to form an annular structure; a notch (32) is arranged in the middle of the inner side of the balance cavity (31); two sides of the notch (32) are provided with annular skin pressing plates (33); the skin layer pressing plate (33) is used for pressing and holding the outer sleeve body (12); the axial distance between the sealing groove (111) and the outer sleeve (12) is less than 2 multiplied by H; wherein H is the thickness of the skin layer of the first sealing ring (3).

10. The pipe butting kit according to claim 8, wherein the sealing groove (111) is formed by combining a plurality of grooves.

11. The pipeline butt joint structure comprises a clamp (2), a first sealing ring (3) and two pipe bodies (5) of butted pipelines; the pipe end sleeve is characterized in that the end parts of the butt joint ends of the pipe bodies (5) of two butted pipelines are respectively provided with a pipe end sleeve (1); the pipe end sleeve (1) comprises an inner support body (11), an outer support body (12) and an end sealing disc (13); the inner support body (11) and the outer support body (12) are both circular ring bodies, and the outer diameter of the inner support body (11) is smaller than that of the outer support body (12); the end parts of the inner support body (11) and the outer support body (12) are connected through an end sealing disc (13), so that a pipeline groove (14) with a U-shaped structure is formed between the inner support body (11) and the outer support body (12); the end part of the pipe body (5) of the butted pipeline is clamped into the pipeline groove (14), the end surface of the pipe body (5) is coated by the pipe end sleeve (1), the inner support body (11) is attached to the inner surface of the pipe body (5) of the butted pipeline, and the outer support body (12) is attached to the outer surface of the pipe body (5) of the butted pipeline; a clamping groove (51) is formed in the end part of the pipe body (5); the clamp (2) comprises an inner groove (21); the edge parts (22) at two sides of the groove (21) are respectively clamped in clamping grooves (51) on the pipe bodies (5) of two butted pipelines, so that the outer sleeve body (12) is coated by the hoop (2); the first sealing ring (3) is arranged in the groove (21) and clamped between the clamp (2) and the outer sleeve body (12).

12. The pipe butt joint structure according to claim 11, wherein the pipe end fitting (1) is made of metal or alloy.

13. The pipe butt joint structure according to claim 12, wherein the first seal ring (3) comprises a balance chamber (31); the balance cavity (31) is coated by a skin layer to form an annular structure; a notch (32) is arranged in the middle of the inner side of the balance cavity (31); two sides of the notch (32) are provided with annular skin pressing plates (33); the notch (32) is opposite to the joint (6) between the two butted pipelines; the leather layer pressing plate (33) is pressed on the outer sleeve body (12).

14. The pipe butt joint structure according to claim 13, wherein the outer sleeve (12) has an axial length satisfying the following condition: w5 ÷ 2> L2> (W5-4 XH-W6 max) ÷ 2; wherein L2 is the axial length of the outer sleeve (12), W5 is the groove width of the groove (21), H is the thickness of the skin of the first sealing ring (3), and W6max is the maximum value allowed by the width W6 of the seam (6).

15. The pipe joining structure according to claim 11 or 12 or 13 or 14, further comprising a second seal ring (4); an annular sealing groove (111) is formed in the outer cylindrical surface of the inner support body (11); the second sealing ring (4) is arranged in the sealing groove (111).

16. The pipe docking structure of claim 15, wherein said sealing groove (111) has a plurality of grooves.

17. The pipe butt joint structure according to claim 15, wherein the inner support (11) has a greater axial length than the outer support (12) such that the inner support (11) has a projection (11P) projecting axially from the outer support (12); the seal groove (111) is provided in the projection (11P).

18. The pipe butting structure according to claim 17, wherein the clamping groove (51) is formed by rolling, and when the clamping groove (51) is rolled, the pipe body is inwards sunken to form an inner convex part (52) inside the pipe body; the inner protrusion (52) is fitted into the seal groove (111).

19. The pipe butting structure according to claim 18, wherein the width W2 of the sealing groove (111) is 3.0-20.0 mm.

20. The pipe docking structure of claim 18, wherein the first sealing ring (3) comprises a balancing cavity (31); the balance cavity (31) is coated by a skin layer to form an annular structure; a notch (32) is arranged in the middle of the inner side of the balance cavity (31); two sides of the notch (32) are provided with annular skin pressing plates (33); the notch (32) is opposite to the joint (6) between the two butted pipelines; the leather layer pressing plate (33) is pressed on the outer sleeve body (12); the axial distance between the sealing groove (111) and the outer sleeve (12) is less than 2 multiplied by H; wherein H is the thickness of the skin layer of the first sealing ring (3).

21. The pipe butting structure according to claim 19, wherein the sealing groove (111) is formed by combining a plurality of groove bodies; and a second sealing ring (4) is arranged in each groove body respectively.