Petrochemical stainless steel seamless steel tube

Abstract

The stainless steel seamless steel pipe comprises a first pipe body and a second pipe body which are internally provided with glass fiber reinforced plastic liners respectively, the end of the first pipe body is provided with an expanded lengthened connecting end, the connecting position of the first pipe body and the connecting end is in a frustum shape, and the end of the second pipe body is an inserting end corresponding to the connecting end. The front end of the insertion end is provided with a chamfer, the outer side of the chamfer is coated with a sealing layer, the insertion end is further provided with a plurality of sealing rings, the insertion end of the second pipe body is inserted into the connecting end of the first pipe body, the sealing layer of the insertion end abuts against the connecting position of the first pipe body and the connecting end, and a sealing ring is arranged between the insertion end and the connecting position of the first pipe body and the connecting end. The sealing ring is further clamped between the glass fiber reinforced plastic lining layers of the first pipe body and the second pipe body, the tail end of the connecting end is welded to the outer side of the second pipe body, and the connecting mode of the two pipe bodies has the advantages that the connecting mode is relatively simple, sealing is reliable, and the glass fiber reinforced plastic lining layers inside are not prone to being damaged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of stainless steel seamless pipes for petrochemical industry. BACKGROUND

[0002] The connecting mode of the prior art stainless steel seamless pipe for petrochemical industry is generally to set flanges at the ends of two pipe bodies, then connect the two flanges by bolts after setting a sealing element between the two flanges; this connecting mode has the following disadvantages:

[0003] The setting of flanges makes at least three connecting places between the two pipe bodies, increasing the possibility of leakage;

[0004] The pipe body is generally lined with a corrosion-resistant glass steel lining layer, and the installation of flanges at the end of the pipe body can easily damage the glass steel lining layer;

[0005] The mode of first installing flanges at the end of the pipe body and then connecting the two flanges is complicated. SUMMARY

[0006] The utility model aims at overcoming the disadvantages of the prior art, and provides a stainless steel seamless pipe for petrochemical industry, which has the advantages of relatively simple connection mode, reliable sealing, and difficulty in damaging the internal glass steel lining layer.

[0007] The technical scheme of the utility model is as follows: a stainless steel seamless pipe for petrochemical industry, comprising a first pipe body and a second pipe body, glass steel lining layers are respectively arranged in the first pipe body and the second pipe body, the end of the first pipe body has a flared connecting end, the connecting end is a lengthened connecting end, the connecting place of the first pipe body and the connecting end is in the shape of a truncated cone, one end of the glass steel lining layer of the first pipe body extends to the connecting place of the first pipe body and the connecting end, the end of the second pipe body is an insertion end corresponding to the connecting end, the front end of the insertion end has a chamfer, the outer side of the chamfer is coated with a sealing layer, a plurality of sealing rings are further arranged on the insertion end, and the glass steel lining layer of the second pipe body extends to the end of the insertion end.

[0008] The insertion end of the second pipe body is inserted into the connecting end of the first pipe body, the sealing layer of the insertion end abuts against the connecting place of the first pipe body and the connecting end, and each sealing ring is located between the insertion end and the connecting end.

[0009] A gap exists between the connecting place of the insertion end and the first pipe body and the connecting end, a sealing ring is arranged in the gap, and the sealing ring is further clamped between the glass steel lining layers of the first pipe body and the second pipe body.

[0010] The end of the connecting end and the outer side of the second pipe body are welded.

[0011] Further, one end of the first pipe body and the second pipe body is respectively provided with a connecting end, and the other end of the first pipe body and the second pipe body is respectively provided with an insertion end.

[0012] Further, one end of the first pipe body and the second pipe body is respectively provided with a connecting end, and the other end of the first pipe body and the second pipe body is respectively provided with an insertion end.

[0013] Further, the insertion end is further provided with a step corresponding to the sealing ring, and one side of the sealing ring is limited on the step.

[0014] Further, the inner periphery of the sealing ring is further provided with a ring of protrusions in triangular cross section.

[0015] Further, the insertion end is provided with a plurality of concave rings, and each sealing ring is respectively sleeved in the corresponding concave ring.

[0016] The beneficial effects of the utility model are: in the utility model, the first pipe body and the second pipe body are inserted and connected through the connecting end and the insertion end and then welded, and the connecting portion is stable and reliable; since the connecting end is an extended connecting end, the welding position is far away from the sealing ring, the sealing layer and the sealing ring on the insertion end, so that the heat generated during welding does not affect the sealing element of the connecting portion of the two pipe bodies; the sealing ring, the sealing layer and the sealing ring form a multilayer sealing between the first pipe body and the second pipe body, which can ensure the sealing reliability of the connecting portion of the first pipe body and the second pipe body; since the sealing ring is also clamped between the glass steel lining of the first pipe body and the second pipe body, the medium can be effectively prevented from entering the gap between the glass steel lining and the first pipe body or the second pipe body. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structural schematic view of the connecting portion of the first pipe body and the second pipe body in the utility model;

[0018] Figure 2 It is the structural schematic view of the end portion of the first pipe body in the utility model;

[0019] Figure 3 It is the structural schematic view of the end portion of the second pipe body in the utility model;

[0020] Figure 4 It is the structural schematic view of the sealing ring in the utility model;

[0021] Figure 5 It is the structural schematic view of the insertion end of the second pipe body in the utility model.

[0022] In the drawing: the first pipe body 1, the second pipe body 2, the glass steel lining 3, the connecting end 4, the insertion end 5, the sealing layer 6, the sealing ring 7, the sealing ring 8, the convex ring 9. DETAILED DESCRIPTION

[0023] The technical scheme of the utility model will be further explained in detail below by way of examples in combination with drawings.

[0024] In combination with Figures 1-5 As shown in the figure, a kind of petrochemical stainless steel seamless pipe, including first pipe body 1 and second pipe body 2, glass steel lining 3 is respectively arranged in the first pipe body 1 and second pipe body 2;

[0025] The end of the first pipe body 1 has the connecting end 4 of diameter expansion, the connecting end 4 is lengthened connecting end, the connecting place of the first pipe body 1 and connecting end 4 is conical frustum, one end of the glass steel lining 3 of the first pipe body 1 extends to the connecting place of the first pipe body 1 and connecting end 4, the end of the second pipe body 2 is the insertion end 5 corresponding to the connecting end 4, the insertion end 5 front end has chamfer, the outer side of the chamfer is coated with sealing layer 6, a plurality of sealing rings 7 are also provided on the insertion end 5, the glass steel lining 3 of the second pipe body 2 extends to the end of the insertion end 5;

[0026] The insertion end 5 of the second pipe body 2 is inserted in the connecting end 4 of the first pipe body 1, the sealing layer 6 of the insertion end 5 abuts the connecting place of the first pipe body 1 and connecting end 4, each sealing ring 7 is located between the insertion end 5 and connecting end 4;

[0027] The connecting place of the insertion end 5 and the first pipe body 1 and connecting end 4 exists gap, sealing ring 8 is arranged in the gap, the sealing ring 8 is also clamped between the glass steel lining 3 of the first pipe body 1 and second pipe body 2;

[0028] The end of the connecting end 4 and the outside of the second pipe body 2 are welded.

[0029] In the above structure, the first pipe body 1 and the second pipe body 2 are inserted after being connected by the connecting end 4 and the insertion end 5, and then welded, and the connecting place is stable and reliable;Since the connecting end 4 is a lengthened connecting end, the position of welding is far away from the sealing ring 8, the sealing layer 6 on the insertion end 5 and the sealing ring 7, so that the heat generated during welding does not affect the sealing elements at the connecting place of the two pipe bodies;The sealing ring 8, the sealing layer 6 and the sealing ring 7 form multiple layers of sealing between the first pipe body 1 and the second pipe body 2, which can ensure the sealing reliability of the connecting place of the first pipe body 1 and the second pipe body 2;And since the sealing ring 8 is also clamped between the glass steel lining 3 of the first pipe body 1 and the second pipe body 2, the medium can be effectively prevented from entering the gap between the glass steel lining 3 and the first pipe body 1 or the second pipe body 2.

[0030] In another embodiment, one end of the first pipe body 1 and the second pipe body 2 is respectively provided with the connecting end 4, and the other end of the first pipe body 1 and the second pipe body 2 is respectively provided with the insertion end 5, so as to facilitate the mutual connection of multiple pipe bodies.

[0031] In another embodiment, in combination with Figure 1 and Figure 4 As shown in the drawings, the glass steel lining 3 of the first pipe body 1 and the second pipe body 2 are respectively provided with a clamping ring at the end facing each other, and the sealing ring 8 is provided with a corresponding convex ring 9 on both sides, which is clamped into the corresponding clamping ring to ensure the sealing of the sealing ring 8 to the end of the glass steel lining 3.

[0032] In another embodiment, in combination with Figure 1 and Figure 3 As shown in the drawings, the end of the insertion end 5 is also provided with a step corresponding to the sealing ring 8, and one side of the sealing ring 8 is limited on the step to avoid displacement of the sealing ring 8.

[0033] In another embodiment, as shown in the drawings, Figure 1 The inner periphery of the sealing ring 8 is also provided with a ring of triangular cross-section protrusions, which guide the medium to reduce the impact on the connection between the sealing ring 8 and the glass steel lining 3 when the medium passes through.

[0034] In another embodiment, the insertion end 5 is provided with multiple recessed rings, and each sealing ring 7 is respectively sleeved in the corresponding recessed ring.

Claims

1. A seamless stainless steel pipe for petrochemical applications, comprising a first pipe body (1) and a second pipe body (2), wherein the first pipe body (1) and the second pipe body (2) are respectively provided with fiberglass linings (3), characterized in that, The first tube (1) has an enlarged diameter connecting end (4) at its end. The connecting end (4) is an extended connecting end. The connection between the first tube (1) and the connecting end (4) is frustoconical. One end of the fiberglass liner (3) of the first tube (1) extends to the connection between the first tube (1) and the connecting end (4). The end of the second tube (2) is an insertion end (5) corresponding to the connecting end (4). The front end of the insertion end (5) has a chamfer. The outside of the chamfer is coated with a sealing layer (6). The insertion end (5) is also provided with multiple sealing rings (7). The fiberglass liner (3) of the second tube (2) extends to the end of the insertion end (5). The insertion end (5) of the second tube (2) is inserted into the connecting end (4) of the first tube (1), and the sealing layer (6) of the insertion end (5) abuts against the connection between the first tube (1) and the connecting end (4). Each of the sealing rings (7) is located between the insertion end (5) and the connecting end (4). There is a gap between the insertion end (5) and the connection of the first tube body (1) and the connecting end (4), and a sealing ring (8) is provided in the gap. The sealing ring (8) is also sandwiched between the fiberglass lining (3) of the first tube body (1) and the second tube body (2). The end of the connecting end (4) is welded to the outside of the second tube body (2).

2. The seamless stainless steel pipe for petrochemical applications as described in claim 1, characterized in that, One end of the first tube (1) and the second tube (2) is provided with a connecting end (4), and the other end of the first tube (1) and the second tube (2) is provided with an insertion end (5).

3. The seamless stainless steel pipe for petrochemical applications as described in claim 2, characterized in that, The fiberglass lining (3) of the first tube (1) and the second tube (2) are respectively provided with a retaining ring at one end facing each other. The sealing ring (8) has corresponding protruding rings (9) on both sides, and the two protruding rings (9) are respectively inserted into the corresponding retaining rings.

4. The seamless stainless steel pipe for petrochemical applications as described in claim 3, characterized in that, The insertion end (5) also has a step corresponding to the sealing ring (8), and one side of the sealing ring (8) is limited on the step.

5. A seamless stainless steel pipe for petrochemical applications as described in claim 4, characterized in that, The inner circumference of the sealing ring (8) also has a ring of protrusions with a triangular cross-section.

6. The seamless stainless steel pipe for petrochemical applications as described in claim 5, characterized in that, The insertion end (5) is provided with multiple concave rings, and each of the sealing rings (7) is respectively fitted inside the corresponding concave ring.

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