Expansion joint device for PPH pipeline

Abstract

A telescopic joint device for a PPH pipeline belongs to the technical field of pipelines and comprises a fixed cylinder and a telescopic cylinder, the fixed cylinder is movably connected with the telescopic cylinder in an inserted mode, and a shower guide pipe is arranged on the outer wall of the fixed cylinder. A connecting flange A is arranged at the end, away from the telescopic cylinder, of the fixed cylinder, an annular gland is arranged at the end, close to the telescopic cylinder, of the fixed cylinder, and the fixed cylinder is inserted into the telescopic cylinder through the annular gland. The end, close to the fixed cylinder, of the telescopic cylinder penetrates through the annular gland and extends into the fixed cylinder, and a connecting flange B is arranged at the end, away from the fixed cylinder, of the telescopic cylinder. A supporting limiting block is arranged on the outer wall of the end, extending into the fixed cylinder, of the telescopic cylinder, and the height of the supporting limiting block is matched with the height of the interval interlayer. The expansion joint device for the PPH pipeline is reasonable in design, simple and stable in structure, high in negative pressure resistance and good in sealing performance, the service life of the expansion joint device can be prolonged, continuous production operation can be guaranteed, and the expansion joint device is suitable for popularization.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline technical field especially relates to a telescopic joint device for PPH pipeline. BACKGROUND

[0002] PPH pipeline, namely homopolymer polypropylene pipe, is a kind of high-performance plastic pipeline, which has the advantages of chemical corrosion resistance, wear resistance, good insulation, high temperature resistance, non-toxicity, light weight and the like. PPH pipeline is widely used in many fields due to its excellent performance, including chemical industry field, building field, water supply and drainage system and the like. When selecting and using PPH pipeline, the material properties, production process, application field and installation and maintenance and the like should be fully considered to ensure the safety and reliability of the pipeline system.

[0003] The production principle of PPH pipeline is mainly based on the processing characteristics and forming technology of polypropylene (PP) material. Its production process includes raw material preparation, heating melting, extrusion molding, cooling and cutting, special process treatment (such as β modification), inspection and packaging and the like. Through strict process flow and equipment requirements, PPH pipeline products with stable quality and excellent performance can be produced.

[0004] In industrial production process, PPH pipeline is commonly used as conveying pipeline of easily-corroded tail gas. In order to avoid the influence of thermal expansion and cold shrinkage, long-distance pipeline needs to be segmented and added with expansion cylinder according to laying technical requirements. At present, canvas soft connecting cylinder is usually used in PPH pipeline application. However, in actual use, the soft connecting connection has poor negative pressure resistance, is easy to be sucked, has low strength, is easy to break after aging, has poor sealing, has short service life and needs to be replaced frequently, thereby bringing more safety hazards to continuous production operation. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the deficiencies of poor negative pressure resistance, low strength and poor sealing of canvas soft connecting cylinder in the prior art, and provides a telescopic joint device for PPH pipeline, which has reasonable design, simple and stable structure, high negative pressure resistance and good sealing, can not only prolong the service life, but also ensure continuous production operation, and is suitable for promotion.

[0006] The utility model discloses a telescopic joint device for PPH pipeline, which is characterized by the following technical solutions: a fixed cylinder and a telescopic cylinder are provided, the fixed cylinder is movably connected with the telescopic cylinder, so that the fixed cylinder and the telescopic cylinder can form a telescopic structure of "double sleeve insertion type", and a guide pipe is arranged on the outer wall of the fixed cylinder; a connecting flange A is arranged on one end of the fixed cylinder away from the telescopic cylinder, and a coaxial annular gland is arranged on one end of the fixed cylinder close to the telescopic cylinder; the fixed cylinder is movably connected with the telescopic cylinder through the annular gland; the telescopic cylinder extends to the inside of the fixed cylinder after passing through the annular gland; and a connecting flange B is arranged on one end of the telescopic cylinder away from the fixed cylinder.

[0007] The fixed cylinder of the device is connected with a conveying pipeline through the connecting flange A, and the telescopic cylinder is connected with the conveying pipeline through the connecting flange B, and the accumulated liquid in the pipe is discharged through the guide pipe connected to the fixed cylinder. The fixed cylinder is movably connected with the telescopic cylinder through the annular gland, thereby forming a telescopic structure of "double sleeve insertion type". The outer wall of the telescopic cylinder at the telescopic end is provided with a support limiting block, which cooperates with the annular gland to provide good support and prevent the telescopic cylinder from being separated.

[0008] Further improvements of the utility model include that a sealing ring is embedded on the inner wall of the annular gland, and a sealing block is embedded on the top side of the support limiting block. The sealing ring and the sealing block can ensure the sealing between the fixed cylinder and the telescopic cylinder and prevent leakage.

[0009] Further improvements of the utility model include that the annular gland comprises two annular plates, the two annular plates are arranged in a stacked manner and connected into a whole through a bolt assembly, and a sealing ring is embedded on the inner wall of each of the two annular plates. The annular gland forms a structure of "double sealing ring" through the two annular plates, and the sealing of this structure is more airtight, which can ensure that the device does not leak.

[0010] Further improvements of the utility model include that grooves for embedding the sealing rings are formed on the inner walls of the two annular plates at the joint, the grooves on the opposite sides are open structures, so that the two grooves can be spliced into a complete installation groove when the two annular plates are arranged in a stacked manner, and the two sealing rings are arranged in a stacked manner and embedded in the installation groove. Through the above design, the assembly difficulty of the two sealing rings can be reduced, and the airtightness of the "double sealing ring" structure can be further improved.

[0011] The further improvement of the utility model still has that the inner wall of the fixed cylinder close to the annular gland is provided with the limiting block corresponding to the supporting limiting block.

[0012] The further improvement of the utility model still has that the fixed cylinder is connected with the connecting flange A through the reducing pipe joint.

[0013] From the above technical scheme, the beneficial effects of the utility model can be seen: the fixed cylinder of the device is connected with the conveying pipeline through the connecting flange A, and the telescopic cylinder is connected with the conveying pipeline through the connecting flange B, and the accumulated liquid in the pipe is discharged through the guide pipe connected to the fixed cylinder. The fixed cylinder is movably inserted with the telescopic cylinder through the annular gland, and a telescopic structure of double sleeve insertion type is formed, the outer wall of the telescopic end of the telescopic cylinder is provided with a supporting limiting block, and the supporting limiting block cooperates with the annular gland, which not only can provide good support, but also can prevent the telescopic cylinder from being separated. When the pipeline is affected by thermal expansion and cold contraction, the telescopic structure can effectively relieve the pipeline expansion and eliminate the safety hidden trouble in production; and the overall structural strength of the device is high, easy to maintain and maintain, and the service life can be prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme of the utility model, the drawings needed in the description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0015] Figure 1 is the structure schematic view of the fixed cylinder of the specific embodiment of the utility model.

[0016] Figure 2 is Figure 1 the enlarged view of the local part A in the figure.

[0017] Figure 3 is the structure schematic view of the fixed cylinder of the specific embodiment of the utility model.

[0018] Figure 4 is the structure schematic view of the telescopic cylinder of the specific embodiment of the utility model.

[0019] In the figure: 1, fixed cylinder; 2, telescopic cylinder; 3, guide pipe; 4, connecting flange A; 5, connecting flange B; 6, annular gland; 601, annular plate; 602, bolt assembly; 7, supporting limiting block; 8, sealing ring; 9, sealing block; 10, reducing pipe joint; 11, limiting block. DETAILED DESCRIPTION

[0020] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme of the utility model will be clearly and completely described below in combination with the drawings in the specific embodiments. Obviously, the embodiments described below are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the patent, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the patent.

[0021] Embodiment one, now refer to Figure 1 、 3 and 4, which are described as follows: the utility model discloses a telescopic joint device for PPH pipeline, which comprises a fixed cylinder 1 and a telescopic cylinder 2, the fixed cylinder 1 is movably connected with the telescopic cylinder 2, so that the fixed cylinder 1 and the telescopic cylinder 2 can form a telescopic structure of "double-sleeve insertion type", and a drain pipe 3 is arranged on the outer wall of the fixed cylinder 1; a connecting flange A 4 is arranged at one end of the fixed cylinder 1 away from the telescopic cylinder 2, and a coaxial annular gland 6 is arranged at one end of the fixed cylinder 1 close to the telescopic cylinder 2, and the fixed cylinder 1 is connected with the telescopic cylinder 2 through the annular gland 6; the telescopic cylinder 2 extends to the inside of the fixed cylinder 1 after passing through the annular gland 6 close to the fixed cylinder 1, and a connecting flange B 5 is arranged at one end of the telescopic cylinder 2 away from the fixed cylinder 1; the inner diameter of the annular gland 6 is adapted to the outer diameter of the telescopic cylinder 2, and the inner diameter of the annular gland 6 is smaller than the inner diameter of the fixed cylinder 1, so that a spacing layer can be formed between the part of the telescopic cylinder 2 inserted into the fixed cylinder 1 and the fixed cylinder 1; a support limiting block 7 is arranged on the outer wall of one end of the telescopic cylinder 2 inserted into the fixed cylinder 1, and the height of the support limiting block 7 is adapted to the height of the spacing layer.

[0022] Specifically, a sealing ring 8 is embedded on the inner wall of the annular gland 6, and a sealing block 9 is embedded on the top side of the support limiting block 7. Through the design of the sealing ring 8 and the sealing block 9, the sealing property between the fixed cylinder 1 and the telescopic cylinder 2 can be ensured, and the problem of leakage can be prevented.

[0023] Specifically, a limiting stop block 11 corresponding to the support limiting block 7 is arranged on the inner wall of the fixed cylinder 1 close to the annular gland 6. Through the design of the limiting stop block 11, the telescopic safety of the telescopic cylinder 2 can be further improved, and the telescopic cylinder 2 can be effectively prevented from being separated.

[0024] Specifically, the fixed cylinder 1 is connected with the connecting flange A 4 through a variable-diameter pipe joint 10. Through the design of the variable-diameter pipe joint 10, the conveying smoothness of the fixed cylinder 1 can be improved, and thus the conveying smoothness of the device is improved.

[0025] The fixed cylinder 1 of the device is connected with the conveying pipeline through the connecting flange A4, and the telescopic cylinder 2 is connected with the conveying pipeline through the connecting flange B5, and the accumulated liquid in the pipe is discharged through the guide pipe 3 connected to the fixed cylinder 1. The fixed cylinder 1 is movably inserted with the telescopic cylinder 2 through the annular gland 6, and a telescopic structure of "double sleeve insertion" is formed, the outer wall of the telescopic end of the telescopic cylinder 2 is provided with a supporting limiting block 7, the supporting limiting block 7 cooperates with the annular gland 6, not only can provide good support, but also can prevent the telescopic cylinder 2 from being separated. When the pipeline is affected by thermal expansion and cold contraction, the telescopic structure can effectively relieve the pipeline expansion and eliminate the safety hidden trouble in production; and the overall structural strength of the device is high, easy to maintain and maintain, and can prolong the service life.

[0026] In example two, on the basis of example one, referring to Figure 2 The annular gland 6 includes two annular plates 601, the two annular plates 601 are stacked and connected into one body through a bolt assembly 602, and the inner walls of the two annular plates 601 are respectively embedded with sealing rings 8. The annular gland 6 forms a "double sealing ring" structure through the design of the above two annular plates 601, and the sealing of this structure is more tight, which can ensure that the device will not leak.

[0027] Specifically, the inner walls of the butt joint portions of the two annular plates 601 are respectively provided with grooves for embedding the sealing rings 8, and the opposite sides of the two grooves are open structures, so that the two annular plates 601 can be stacked to form a complete installation groove after being stacked, and the two sealing rings 8 are stacked and embedded in the installation groove. Through the above design, the assembly difficulty of the two sealing rings 8 can be reduced, and the sealing performance of the "double sealing ring" structure can be further improved.

[0028] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A PPH pipe expansion joint device, comprising a fixed cylinder (1) and an expansion cylinder (2), characterized in that, The fixed cylinder (1) and the telescopic cylinder (2) are movably inserted together, so that the fixed cylinder (1) and the telescopic cylinder (2) can form a "double sleeve insertion type" telescopic structure, and a drain pipe (3) is provided on the outer wall of the fixed cylinder (1); a connecting flange A (4) is provided at the end of the fixed cylinder (1) away from the telescopic cylinder (2), and a coaxial annular pressure cap (6) is provided at the end of the fixed cylinder (1) close to the telescopic cylinder (2). The fixed cylinder (1) is inserted into the telescopic cylinder (2) through the annular pressure cap (6); the end of the telescopic cylinder (2) close to the fixed cylinder (1) passes through the annular pressure cap (6) and then... Extending into the interior of the fixed cylinder (1), the telescopic cylinder (2) is provided with a connecting flange B (5) at one end away from the fixed cylinder (1); the inner diameter of the annular cover (6) is adapted to the outer diameter of the telescopic cylinder (2), and the inner diameter of the annular cover (6) is smaller than the inner diameter of the fixed cylinder (1), so that the part of the telescopic cylinder (2) inserted into the fixed cylinder (1) can form a spacer between the telescopic cylinder (2) and the fixed cylinder (1); a support limiting block (7) is provided on the outer wall of one end of the telescopic cylinder (2) extending into the interior of the fixed cylinder (1), and the height of the support limiting block (7) is adapted to the height of the spacer.

2. The expansion joint device for PPH pipelines according to claim 1, characterized in that, A sealing ring (8) is embedded on the inner wall of the annular pressure cap (6), and a sealing block (9) is embedded on the top side of the support limiting block (7).

3. The expansion joint device for PPH pipelines according to claim 2, characterized in that, The annular gland (6) includes two annular plates (601), which are stacked together and connected as one unit by a bolt assembly (602), and sealing rings (8) are respectively embedded on the inner walls of the two annular plates (601).

4. The expansion joint device for PPH pipelines according to claim 3, characterized in that, The inner walls of the two annular plates (601) at the joint are respectively provided with grooves for embedding sealing rings (8). The opposite side of the two grooves is an open structure, so that the two annular plates (601) can be stacked together to form a complete installation groove, and the two sealing rings (8) are stacked and embedded together inside the installation groove.

5. A PPH pipe expansion joint device according to claim 1 or 2, characterized in that, The inner wall of the fixed cylinder (1) near the annular pressure cap (6) is provided with a limiting block (11) corresponding to the supporting limiting block (7).

6. The expansion joint device for PPH pipelines according to claim 5, characterized in that, The fixed cylinder (1) is connected to the connecting flange A (4) through the reducing pipe section (10).

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