Pipeline expansion joint and water conveying pipeline

Abstract

The pipeline expansion joint comprises an outer cylinder, a first inner cylinder is arranged on one side of the outer cylinder, a second inner cylinder is arranged on the other side of the outer cylinder, the second inner cylinder stretches into the outer cylinder and is connected with the outer cylinder in an expansion mode, and a first sealing ring is arranged at one end of the outer cylinder and the end of the first inner cylinder. A first sealing ring is arranged at one end of the outer cylinder, a second sealing ring is arranged at the other end of the outer cylinder and the outer cylinder face of the second inner cylinder, the first sealing ring is arranged in the first pipe clamp, the first pipe clamp is arranged between the outer cylinder and the first inner cylinder, the second sealing ring is arranged in the second pipe clamp, and the second pipe clamp is arranged between the outer cylinder and the second inner cylinder. The overhaul and maintenance frequency is reduced, and the high-pressure water delivery requirement is met.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline accessories, in particular to a pipeline expansion joint and a water delivery pipeline. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Expansion joints are widely used in water pipelines. Traditional double-flange limited expansion joints have a complex structure, usually consisting of a body, a sealing ring, a gland, and a short expansion tube. They are mainly used to compensate for the axial expansion and contraction of the pipeline caused by temperature differences, and to overcome various angular displacements, eccentricity, expansion and contraction of the pipeline. Once the maximum expansion and contraction is exceeded, it will act as a limit.

[0004] The telescopic short tube and the main body are sealed by a sealing ring crimped by a pressure cap. The outer end face of the sealing ring is exposed to the outside of the expansion joint. The sealing ring is continuously aged by the external environment and rubbed by the telescopic short tube. After long-term use, the sealing ring is easily damaged and leaks, so frequent inspection and maintenance are required. Moreover, the sealing ring is a soft seal and cannot withstand high pressure, which limits the application conditions of the expansion joint. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a pipeline expansion joint and a water pipeline, wherein the sealing ring is not affected by the external soil environment, has a long service life, and is suitable for the transportation of high-pressure water.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] In the first aspect, an embodiment of the utility model provides a pipe expansion joint, including an outer tube, a first inner tube is provided on one side of the outer tube, and a second inner tube is provided on the other side, wherein the second inner tube extends into the outer tube and is telescopically connected to the outer tube, a first sealing ring is provided at one end of the outer tube and the end of the first inner tube, and a second sealing ring is provided at the other end of the outer tube and the outer tube surface of the second inner tube, the first sealing ring is arranged inside a first pipe clamp, and the first pipe clamp is arranged between the outer tube and the first inner tube, the second sealing ring is arranged inside the second pipe clamp, and the second pipe clamp is arranged between the outer tube and the second inner tube.

[0008] Optionally, the first sealing ring includes a first connecting portion, a first sealing portion that fits with the outer side surface of the outer tube end is provided on one side of the first connecting portion, and a second sealing portion that fits with the outer tube end of the first inner tube is provided on the other side.

[0009] Optionally, the second sealing ring includes a second connecting portion, a third sealing portion is provided on one side of the second connecting portion and is fitted with an outer side surface of the outer tube end, and a fourth sealing portion is provided on the other side of the second connecting portion and is fitted with an outer tube surface of the second inner tube.

[0010] Optionally, a limiting mechanism is provided between the second inner cylinder and the outer cylinder to limit the distance that the second inner cylinder extends out of the outer cylinder.

[0011] Optionally, the limiting mechanism includes a thrust ring fixed to the inner surface of the outer cylinder and an annular boss fixed to the end of the second inner cylinder extending into the outer cylinder.

[0012] Optionally, an annular groove is provided at the end of the second inner tube extending into the outer tube, a fourth sealing ring is provided in the annular groove, and the fourth sealing ring is sealed and fitted with the second inner tube and the outer tube.

[0013] Optionally, annular protrusions are provided on both sides of the inner annular surface of the first tube clamp, wherein the annular protrusion on one side is clamped into an annular groove provided on the wall of the first inner tube, and the protrusion on the other side is clamped with an annular boss provided on the end of the outer tube.

[0014] Optionally, annular protrusions are provided on both sides of the inner annular surface of the second tube clamp, wherein the annular protrusion on one side is inserted into the annular groove provided at the end of the outer tube, and the annular protrusion on the other side is fitted with the outer tube surface of the second inner tube.

[0015] Optionally, the first pipe clamp and the second pipe clamp are both composed of a plurality of pipe clamp parts detachably connected along the annular direction.

[0016] In a second aspect, an embodiment of the utility model provides a water delivery pipeline provided with the pipeline expansion joint described in the first aspect.

[0017] The beneficial effects of the above utility model are as follows:

[0018] 1. In the pipeline expansion joint of the utility model, the first sealing ring is arranged inside the first pipe clamp, and the second sealing ring is arranged inside the second pipe clamp. The first pipe clamp protects the first sealing ring to avoid exposure of the first sealing ring to the external environment, and the second pipe clamp protects the second sealing ring to avoid exposure of the second sealing ring to the external environment. Both sealing rings are protected by the pipe clamps and are not affected by the external environment, thereby extending the service life and reducing the frequency of inspection and maintenance.

[0019] 2. In the pipe expansion joint of the utility model, the first pipe clamp includes a first connection part and a first sealing part and a second sealing part arranged on both sides of the first connection part, the second pipe clamp includes a second connection part and a third sealing part and a fourth sealing part arranged on both sides of the second connection part, the first sealing ring and the second sealing ring are both lip sealing rings, the higher the water pressure, the better the fit between them and the outer tube and the two inner tubes, the better the sealing performance, which meets the needs of water delivery at higher pressure and is suitable for water conservancy and hydropower pipeline applications with higher pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0021] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model;

[0022] Figure 2 This is a sectional view of the overall structure of Embodiment 1 of the utility model;

[0023] Among them, 1. outer tube, 2. first inner tube, 3. second inner tube, 4. first connecting part, 5. first sealing part, 6. second sealing part, 7. second connecting part, 8. third sealing part, 9. fourth sealing part, 10. first pipe clamp, 11. second pipe clamp, 12. thrust ring, 13. annular protrusion, 14. third sealing ring, 15. fourth sealing ring. DETAILED DESCRIPTION

[0024] Example 1

[0025] This embodiment provides a pipeline expansion joint, such as Figure 1-Figure 2 As shown, it includes an outer cylinder 1, a first inner cylinder 2 is provided on one side of the outer cylinder 1, and a second inner cylinder 3 is provided on the other side. The first inner cylinder 2 is located outside the outer cylinder 1, and the second inner cylinder 3 extends into the inner part of the outer cylinder 1 and is telescopically connected to the outer cylinder 1.

[0026] A first sealing ring is arranged between one end of the outer tube 1 and the first inner tube 2. The first sealing ring is a lip-shaped sealing ring, including a first connecting portion 4. The first connecting portion 4 includes two parts distributed at a set obtuse angle. One side of the first connecting portion is bent 180° to form a first sealing portion 5. The first sealing portion 5 is sealed to the outer side surface of the end of the outer tube 1. The other side of the first connecting portion 4 is bent at a set acute angle to form a second sealing portion 6. The second sealing portion 6 is sealed to the outer side surface of the end of the first inner tube 2.

[0027] The first sealing portion 5 and the second sealing portion 6 both adopt a thickness gradient structure, and the thickness gradually decreases in a direction away from the connection position with the first connecting portion.

[0028] Preferably, the first sealing ring is made of rubber.

[0029] A second sealing ring is arranged between the other end of the outer cylinder 1 and the second inner cylinder 3. The structure of the second sealing ring is similar to that of the first sealing ring. The second sealing ring adopts a lip-shaped sealing ring, including a second connecting portion 7. The second connecting portion 7 includes two parts distributed at a set obtuse angle. One side of the second connecting portion 7 is bent 180° to form a third sealing portion 8. The third sealing portion 8 is sealed to the outer cylinder surface of the other end of the outer cylinder 1. The other side of the second connecting portion 7 is bent at a set acute angle to form a fourth sealing portion 9. The fourth sealing portion 9 is sealed to the outer cylinder surface of the second inner cylinder 3.

[0030] The third sealing portion 8 and the fourth sealing portion 9 both adopt a thickness gradient structure, and the thickness gradually decreases in a direction away from the connection position with the second connecting portion 7 .

[0031] Preferably, the second sealing ring is made of rubber.

[0032] In this embodiment, both the first sealing ring and the second sealing ring are lip-shaped sealing rings. The greater the water pressure, the tighter the fit to the pipeline, which meets the needs of water transmission at higher pressures and is suitable for applications in water conservancy and hydropower pipelines with higher pressures.

[0033] A first pipe clamp 10 is provided between one end of the outer tube 1 and the first inner tube, and a first sealing ring is provided inside the first pipe clamp 10. The first pipe clamp 10 covers the first sealing ring to protect the first sealing ring.

[0034] Specifically, the inner annular surface of the first pipe clamp 10 fits with the outer annular surface of the first sealing ring. Along the axial direction of the first pipe clamp 10, annular protrusions are provided on both sides of the inner annular surface of the first pipe clamp 10. The annular protrusion on one side is inserted into the annular groove provided on the outer cylinder surface of the end of the first inner cylinder 2, and the annular protrusion on the other side cooperates with the annular boss at the end of the outer cylinder 1, and the inner side surface of the annular protrusion on this side fits with the side surface of the annular boss.

[0035] The width of the annular protrusion of the first pipe clamp is smaller than the width of the annular groove at the end of the first inner tube 2, so that the first pipe clamp 10 and the first inner tube 2 can rotate relative to each other within a certain range.

[0036] A second pipe clamp 11 is provided between the other end of the outer tube 1 and the second inner tube 3 , and a second sealing ring is provided inside the second pipe clamp 11 . The second pipe clamp 11 covers the second sealing ring to protect the second sealing ring.

[0037] Specifically, the inner ring surface of the second pipe clamp 11 fits with the outer ring surface of the second sealing ring, and along the axial direction of the second pipe clamp 11, annular protrusions are provided on both sides of the inner ring surface of the second pipe clamp 11, wherein the annular protrusion on one side is inserted into the annular groove provided on the outer cylinder surface of the end of the outer cylinder 1, and the annular protrusion on the other side is slidably fitted with the outer cylinder surface of the second inner cylinder 3.

[0038] The width of the annular protrusion of the second pipe clamp is smaller than the width of the annular groove at the end of the outer tube 1, so that the second pipe clamp and the second inner tube can rotate relative to each other by a certain range.

[0039] In this way, the first pipe clamp and the second pipe clamp both adopt a large angle design, so that after the expansion joint of this embodiment is connected to the pipeline, it can adapt to complex geological environments such as earthquake zones, collapsible loess areas, collapse areas, soft geology, etc., and adapt to various complex geological working conditions.

[0040] In this embodiment, both sealing rings are protected by the pipe clamp and are not affected by the external environment, thereby extending the service life and reducing the frequency of inspection and maintenance.

[0041] In order to prevent the second inner cylinder 3 from escaping from the outer cylinder 1 , a limiting mechanism is provided between the second inner cylinder 3 and the outer cylinder 1 to limit the distance that the second inner cylinder 3 extends outward along the outer cylinder 1 .

[0042] The limiting mechanism includes a thrust ring 12 fixed to the inner surface of the outer cylinder 1, the thrust ring 12 is located at the outer periphery of the second inner cylinder 3, and also includes an annular boss arranged at the end of the second inner cylinder 3 extending into the outer cylinder.

[0043] In this embodiment, the annular protrusion 13 on the inner side surface of the end of the outer tube 1 has a position corresponding to the position of the annular groove of the outer tube 1 .

[0044] A third sealing ring 14 is provided between the annular protrusion 13 and the thrust ring 12 . The third sealing ring 14 is sleeved on the outer periphery of the second inner cylinder 3 . Preferably, the third sealing ring 14 is an O-type rubber sealing ring.

[0045] The end of the second inner tube 3 extending into the outer tube is provided with two annular bosses, a mounting groove is formed between the two annular bosses, a fourth sealing ring 15 is provided in the mounting groove, preferably, the fourth sealing ring 15 is an O-type rubber sealing ring, the outer side of the fourth sealing ring 15 is sealed with the inner side surface of the outer tube, and the inner side is sealed with the second inner tube.

[0046] When the second inner cylinder 3 extends outward, the annular boss on which the fourth sealing ring 15 is installed contacts the thrust ring 12 to stop the second inner cylinder 3 from further extending outward, thereby limiting the second inner cylinder 3 and preventing the second inner cylinder 3 from escaping from the outer cylinder 1.

[0047] In this embodiment, in order to facilitate the installation of the first pipe clamp 10 and the second pipe clamp 11, the first pipe clamp 10 and the second pipe clamp 11 are each composed of a plurality of pipe clamp parts that are detachably connected along the annular direction.

[0048] Specifically, lugs are provided at both ends of the pipe clamping part. After adjacent pipe clamping parts are assembled, they are detachably fixedly connected through the lugs and fixing bolts and fixing nuts.

[0049] One end of the first inner tube 2 is connected to the outer tube 1 through the first pipe clamp 10 and the first sealing ring, and the outer tube surface of the other end is provided with an annular groove to connect the grooved steel pipe. One end of the second inner tube 3 extends into the outer tube 1, and the other end is located outside the outer tube 1 and the outer tube surface of the second inner tube 3 is provided with an annular groove to connect the grooved steel pipe.

[0050] Example 2

[0051] This embodiment provides a water pipeline, which is provided with the pipeline expansion joint described in embodiment 1, and the second inner tube 3 can perform expansion and contraction movement along the outer tube, compensate for the expansion and contraction deformation of the pipeline caused by temperature difference, absorb the axial, lateral and angular displacement of the pipeline, and play the role of noise reduction and shock absorption. Moreover, the allowable expansion and contraction distance of the second inner tube 3 is approximately equal to the length of the outer tube 1, and has the characteristic of large expansion and contraction.

[0052] The remaining structures of the water delivery pipeline can adopt the existing technology and will not be described in detail here.

[0053] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A pipeline expansion joint, characterized in that: It includes an outer cylinder, a first inner cylinder is provided on one side of the outer cylinder, and a second inner cylinder is provided on the other side, wherein the second inner cylinder extends into the outer cylinder and is telescopically connected to the outer cylinder, a first sealing ring is provided at one end of the outer cylinder and the end of the first inner cylinder, and a second sealing ring is provided at the other end of the outer cylinder and the outer cylinder surface of the second inner cylinder, the first sealing ring is arranged inside the first pipe clamp, the first pipe clamp is arranged between the outer cylinder and the first inner cylinder, the second sealing ring is arranged inside the second pipe clamp, and the second pipe clamp is arranged between the outer cylinder and the second inner cylinder.

2. A pipeline expansion joint according to claim 1, characterized in that: The first sealing ring comprises a first connecting portion, one side of the first connecting portion is provided with a first sealing portion which is in contact with the outer side surface of the outer tube end, and the other side of the first connecting portion is provided with a second sealing portion which is in contact with the outer tube end of the first inner tube.

3. A pipeline expansion joint according to claim 1, characterized in that: The second sealing ring includes a second connecting portion, a third sealing portion is provided on one side of the second connecting portion and is fitted with the outer side surface of the outer tube end, and a fourth sealing portion is provided on the other side of the second connecting portion and is fitted with the outer tube surface of the second inner tube.

4. A pipeline expansion joint according to claim 1, characterized in that: A limiting mechanism is provided between the second inner cylinder and the outer cylinder to limit the distance that the second inner cylinder extends out of the outer cylinder.

5. A pipeline expansion joint according to claim 4, characterized in that: The limiting mechanism comprises a thrust ring fixed on the inner surface of the outer cylinder and an annular boss fixed on the end of the second inner cylinder extending into the outer cylinder.

6. A pipeline expansion joint according to claim 1, characterized in that: An annular groove is arranged at the end of the second inner tube extending into the outer tube, a fourth sealing ring is arranged in the annular groove, and the fourth sealing ring is sealed and fitted with the second inner tube and the outer tube.

7. A pipeline expansion joint according to claim 1, characterized in that: Annular protrusions are provided on both sides of the inner annular surface of the first tube clamp, wherein the annular protrusion on one side is clamped into the annular groove provided on the wall of the first inner tube, and the protrusion on the other side is clamped with the annular boss provided on the end of the outer tube.

8. A pipeline expansion joint according to claim 1, characterized in that: Annular protrusions are provided on both sides of the inner annular surface of the second tube clamp, wherein the annular protrusion on one side is inserted into the annular groove provided at the end of the outer tube, and the annular protrusion on the other side is fitted with the outer tube surface of the second inner tube.

9. A pipeline expansion joint according to claim 1, characterized in that: The first pipe clamp and the second pipe clamp are both composed of a plurality of pipe clamp parts detachably connected along the annular direction.

10. A water pipeline, characterized in that: A pipeline expansion joint as described in any one of claims 1 to 9 is provided.

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