A retractor

Abstract

This application belongs to the technical field of pipeline connection structure, specifically relating to an expansion joint, which includes a body, an expansion tube, and a sealing ring. A flow channel is formed through the body, and an annular groove is formed on the inner wall of the flow channel along its circumference. The expansion tube is movably inserted into one end of the flow channel, with a clearance fit between the inner wall of the flow channel and the outer wall of the expansion tube. The sealing ring is disposed in the annular groove and is configured to compress axially under fluid pressure in the flow channel, resulting in a tendency for radial width to increase. This expansion joint only includes a body, an expansion tube, and a sealing ring, significantly reducing the number of components and manufacturing costs. Furthermore, the sealing ring achieves a self-sealing effect by radial compression under axial pressure, eliminating the need for an additional pre-tightening structure. It provides excellent compensation for eliminating mechanical and thermal stresses in pipelines, especially radial stress caused by foundation settlement.

Description

Technical Field

[0001] This application belongs to the technical field of pipeline connection equipment, and more specifically, relates to an expansion joint. Background Technology

[0002] In industrial pipeline systems, to cope with the expansion and contraction and displacement of pipelines caused by factors such as temperature changes and mechanical vibrations, appropriate pipeline connection compensation structures, also known as pipeline expansion joints, are required to ensure the sealing and stability of the pipeline system and ensure the safe and efficient transmission of media. The design and performance of pipeline connection compensation structures directly affect the operating efficiency, service life, and maintenance costs of the entire pipeline system, and are crucial in many fields such as petrochemicals, heating and ventilation, and water supply and drainage.

[0003] However, in practical use, the existing technology has been found to have the following shortcomings: 1. Complex structure, with many components working together, increasing the difficulty of design, manufacturing, and installation; 2. Low adjustment efficiency, as expansion and contraction adjustment requires simultaneous operation of components such as studs and nuts, making the process cumbersome and difficult to quickly respond to the expansion and contraction needs of pipelines; 3. High manufacturing cost, as the complex structural design means higher precision requirements for component processing, more assembly processes, and more cumbersome technical debugging, thus increasing the overall manufacturing cost; therefore, it is necessary to propose a new type of expansion joint to solve the above technical problems. Utility Model Content

[0004] In view of the deficiencies or improvement needs of the prior art, this application provides an expansion joint, which aims to solve the technical problems of complex structure, low adjustment efficiency and high manufacturing cost of the expansion joint in the prior art.

[0005] This application provides a telescopic device, which includes a body, a telescopic tube, and a sealing ring; A flow channel is formed through the body, and an annular groove is formed on the inner wall of the flow channel along its circumference; a telescopic tube is movably inserted into one end of the flow channel, and the inner wall of the flow channel and the outer wall of the telescopic tube are clearance-fitted; a sealing ring is disposed in the annular groove, and the sealing ring is configured to be compressed axially when subjected to fluid pressure in the flow channel, forming a tendency for the radial width to increase.

[0006] As a further preferred embodiment, the sealing ring has an inner wall that contacts the outer surface of the telescopic tube and an outer wall that is opposite to the inner wall; at least one of the inner wall and the outer wall forms a weakening cavity, and the sealing ring deforms at the location of the weakening cavity.

[0007] As a further preferred embodiment, the weakening cavity is an annular groove arranged circumferentially along the sealing ring.

[0008] As a further preferred embodiment, the weakening cavity is provided in a first weakening cavity on the inner sidewall and a second weakening cavity formed on the outer sidewall; the first weakening cavity and the second weakening cavity are staggered in the axial direction of the sealing ring.

[0009] As a further preferred embodiment, the sealing ring includes a plurality of ring units connected sequentially along its axial direction, the first weakening cavity being located inside the ring units, and two adjacent ring units jointly defining the second weakening cavity.

[0010] As a further preferred embodiment, the ring unit comprises a first segment, a second segment, and a third segment connected sequentially in cross-section. The first segment, the second segment, and the third segment of each ring unit together define the first weakening cavity, and the third segment of the preceding ring unit and the first segment of the following ring unit define the second weakening cavity.

[0011] As a further preferred embodiment, the first segment extends axially along the fluid flow direction in the flow channel and radially outward in the flow channel; the third segment extends axially along the fluid flow direction in the flow channel and radially inward in the flow channel.

[0012] As a further preferred embodiment, the sealing ring is a one-piece rubber structure formed by compression molding, injection molding, or extrusion molding.

[0013] As a further preferred embodiment, the distance between the annular groove and the end of the body near the telescopic tube is 6~12mm.

[0014] As a further preferred embodiment, the end of the body away from the telescopic pipe is provided with a first assembly flange for connection to a valve; the end of the telescopic pipe away from the body is provided with a second assembly flange for connection to a pipeline.

[0015] In summary, compared with the prior art, the technical solutions conceived in this application have the following main technical advantages: 1. Compared with the prior art, the above-described technical solution conceived in this application has the advantage of providing an annular groove on the inner wall of the flow channel, with the sealing ring set in the annular groove. When subjected to fluid pressure in the flow channel, the sealing ring is compressed axially, resulting in a radially increasing width. This achieves directional deformation of the sealing ring, i.e., the sealing ring is radially compressed under axial pressure to achieve a self-sealing effect. No additional pre-tightening structure is required. The expansion joint only includes the body, the expansion tube, and the sealing ring, greatly reducing the number of components and significantly lowering manufacturing costs. Since the expansion tube and the body are clearance-fitted, they can extend and retract freely without complex adjustment procedures. The radial displacement space is large, providing excellent compensation for eliminating mechanical stress and thermal stress in pipelines, especially for radial stress caused by foundation settlement.

[0016] 2. By setting a weakening cavity on the inner or outer wall of the sealing ring, the sealing ring is preferentially deformed at the corresponding position of the weakening cavity when subjected to fluid pressure. This precisely controls the deformation path of the sealing ring, avoiding local stress concentration or excessive compression failure caused by disordered expansion. This not only enhances the targeting of radial sealing but also extends the service life of the sealing ring.

[0017] 3. The weakening cavity is designed as an annular groove along the circumference of the sealing ring, which makes the sealing ring deform evenly in the circumference when under pressure, avoiding local sealing failure caused by uneven circumferential deformation, ensuring the consistency of sealing performance in the circumferential direction, and improving the overall sealing stability of the expansion joint.

[0018] 4. A first weakening cavity is provided on the inner wall and a second weakening cavity is provided on the outer wall, with the two axially offset, forming a double-sided deformation support structure. The inner weakening cavity promotes the sealing ring to expand radially towards the center and fit tightly against the telescopic tube, while the outer weakening cavity restrains excessive expansion and provides reverse support. The two work together to enhance the contact pressure between the sealing ring and the telescopic tube and the body, significantly improving the sealing effect, while dispersing stress and reducing the risk of sealing ring tearing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the cross-sectional structure of an expansion joint provided in an embodiment of this application; Figure 2 yes Figure 2 Enlarged view of region A in the middle; Figure 3 This is a schematic diagram of the cross-sectional structure of a sealing ring in an expansion joint provided in an embodiment of this application.

[0020] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 10. Body; 10a. Flow channel; 10b. Annular groove; 11. First assembly flange; 20. Expansion joint; 21. Second assembly flange; 30. Sealing ring; 31. First weakened cavity; 32. Second weakened cavity; 301. Ring unit; 3011. First segment; 3012. Second segment; 3013. Third segment. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0022] This application provides an embodiment of a telescoping device, such as... Figure 1 and Figure 2As shown, it includes a body 10, a telescopic tube 20, and a sealing ring 30.

[0023] A flow channel 10a is formed on the body 10, penetrating the body 10. An annular groove 10b is formed on the inner wall of the flow channel 10a along its circumference. A telescopic tube 20 is movably inserted into one end of the flow channel 10a, such as in… Figure 2 In the middle, the telescopic tube 20 is movably inserted into the right end of the flow channel 10a.

[0024] The inner wall of the flow channel 10a and the outer wall of the telescopic tube 20 are fitted with a clearance; the sealing ring 30 is disposed in the annular groove 10b, and the sealing ring 30 is configured to compress in the axial direction when subjected to fluid pressure in the flow channel, forming a tendency to increase the radial width.

[0025] The sealing ring 30 has an inner wall that contacts the outer surface of the telescopic tube 20 and an outer wall that is opposite to the inner wall; at least one of the inner wall and the outer wall is formed with a weakening cavity, and the sealing ring 30 is deformed at the position of the weakening cavity.

[0026] By providing weakening cavities on the inner and / or outer walls of the sealing ring 30, the sealing ring 30 is preferentially deformed at the corresponding position of the weakening cavity when subjected to fluid pressure. This precisely controls the deformation path of the sealing ring 30, avoiding local stress concentration or excessive compression failure caused by disordered expansion. This not only enhances the targeting of radial sealing but also extends the service life of the sealing ring.

[0027] Preferably, in this embodiment, the weakening cavity is an annular groove arranged circumferentially along the sealing ring 30. The weakening cavity is designed as an annular groove arranged circumferentially along the sealing ring, ensuring uniform circumferential deformation of the sealing ring under pressure. This avoids localized sealing failure caused by uneven circumferential deformation, ensures consistent sealing performance in the circumferential direction, and improves the overall sealing stability of the expansion joint.

[0028] As an optional implementation, the weakening cavity includes a first weakening cavity 31 disposed on the inner sidewall and a second weakening cavity 32 formed on the outer sidewall; the first weakening cavity 31 and the second weakening cavity 32 are staggered in the axial direction of the sealing ring 30.

[0029] A first weakening cavity 31 is provided on the inner wall and a second weakening cavity 32 is provided on the outer wall, with the two axially offset, forming a double-sided deformation support structure. The first weakening cavity 31 promotes the sealing ring 30 to expand radially towards the center and fit tightly against the telescopic tube 20, while the outer weakening cavity 32 restrains excessive expansion and provides reverse support. The two work together to enhance the contact pressure between the sealing ring 30 and the telescopic tube 20 and the body 10, significantly improving the sealing effect, while dispersing stress and reducing the risk of sealing ring tearing.

[0030] In one optional embodiment, the sealing ring 30 includes a plurality of ring units 301 connected sequentially along its axial direction, the first weakening cavity 31 is located inside the ring unit 301, and two adjacent ring units 301 together define a second weakening cavity 32.

[0031] Specifically, in combination Figure 3 As shown, in this embodiment, the structure of the ring unit 301 can be configured as follows: The ring unit 301 includes a first segment 3011, a second segment 3012, and a third segment 3013 connected in sequence in cross section. The first segment 3011, the second segment 3012, and the third segment 3013 of each ring unit 301 together define the first weakening cavity 31. The third segment 3013 of the previous ring unit 301 and the first segment 3011 of the next ring unit 301 define the second weakening cavity 32.

[0032] The first segment 3011 extends axially along the fluid flow direction in the flow channel 10a and extends radially outward in the flow channel 10a; the second segment 3012 is parallel to the axial direction of the flow channel 10a; the third segment 3013 extends axially along the fluid flow direction in the flow channel 10a and extends radially inward in the flow channel 10a.

[0033] This structural design allows the ring unit 301 to form a spring-like structure in its cross-section, which facilitates axial compression under fluid action, reduces deformation resistance, effectively guides the radial expansion direction of the sealing ring 30, and makes the sealing ring 30 fit more closely to the surface of the telescopic tube 20 under fluid pressure, forming a continuous, gapless sealing interface to ensure sealing performance.

[0034] In this embodiment, the sealing ring 30 is preferably an integral rubber structure formed by compression molding, injection molding, or extrusion molding; this eliminates the splicing gaps of split sealing rings and avoids sealing failure caused by seam leakage; the integral molding process also improves the structural strength and dimensional accuracy of the sealing ring, while reducing processing costs and increasing production efficiency.

[0035] To ensure a reliable seal for the telescopic tube 20 during its extension and retraction, the distance between the annular groove 10b and the end of the body 10 closest to the telescopic tube 20 is 6-12 mm. This distance range satisfies the product's pressure resistance requirements while effectively controlling material costs. For example, the distance between the annular groove 10b and the end of the body 10 closest to the telescopic tube 20 can be 6 mm, 8 mm, 10 mm, or 12 mm, etc.

[0036] The body 10 is provided with a first assembly flange 11 for connection with the valve at the end away from the telescopic pipe 20; the telescopic pipe 20 is provided with a second assembly flange 21 for connection with the pipeline at the end away from the body 10. The first assembly flange 11 connects the body 10 and the valve, and the second assembly flange 21 connects the telescopic pipe 20 and the pipeline, thereby meeting the connection compensation requirements of the valve and the pipeline, ensuring high connection reliability and facilitating disassembly and maintenance.

[0037] In general, since the present application has an annular groove 10b on the inner side wall of the flow channel 10a, and the sealing ring 30 is disposed in the annular groove 10b, the sealing ring 30 is compressed in the axial direction when subjected to the fluid pressure in the flow channel, forming a trend of increasing radial width, thereby realizing the directional deformation of the sealing ring 30. That is, the sealing ring 30 is axially compressed and generates radial extrusion to achieve the self-sealing effect, without the need for an additional pre-tightening structure.

[0038] This expansion joint consists of only the body 10, the telescopic tube 20, and the sealing ring 30, greatly reducing the number of parts and significantly lowering manufacturing costs. Since the telescopic tube and the body are clearance-fitted, they can extend and retract freely without the need for complex adjustment procedures. It has a large radial displacement space and is very effective in eliminating mechanical and thermal stresses in pipelines, especially in compensating for radial stresses caused by foundation settlement.

[0039] It should be understood that expressions such as "comprising" and "may include" as used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as "comprising" and / or "having" may be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or combination thereof, but should not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0040] It should be understood that the terms “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A retractor characterized by, Includes the body (10), the telescopic tube (20) and the sealing ring (30); A flow channel (10a) is formed on the body (10) through the body (10), and an annular groove (10b) is formed on the inner wall of the flow channel (10a) along its circumference; the telescopic tube (20) is movably inserted into one end of the flow channel (10a), and the inner wall of the flow channel (10a) and the outer wall of the telescopic tube (20) are clearance-fitted; the sealing ring (30) is disposed in the annular groove (10b), and the sealing ring (30) is configured to be compressed in the axial direction when subjected to fluid pressure in the flow channel, forming a tendency to increase the radial width.

2. The retractor of claim 1, wherein, The sealing ring (30) has an inner wall that contacts the outer surface of the telescopic tube (20) and an outer wall that is opposite to the inner wall; at least one of the inner wall and the outer wall is formed with a weakening cavity, and the sealing ring (30) is deformed at the position of the weakening cavity.

3. The telescopic device according to claim 2, characterized in that, The weakening cavity is an annular groove arranged circumferentially along the sealing ring (30).

4. The telescopic device according to claim 2, characterized in that, The weakening cavity includes a first weakening cavity (31) disposed on the inner sidewall and a second weakening cavity (32) formed on the outer sidewall; the first weakening cavity (31) and the second weakening cavity (32) are staggered in the axial direction of the sealing ring (30).

5. The retractor of claim 4, wherein, The sealing ring (30) includes a plurality of ring units (301) connected sequentially along its axial direction. The first weakening cavity (31) is located inside the ring unit (301), and two adjacent ring units together define the second weakening cavity (32).

6. The telescopic device according to claim 5, characterized in that, The ring unit (301) includes a first segment (3011), a second segment (3012), and a third segment (3013) connected in sequence in cross section. The first segment (3011), the second segment (3012), and the third segment (3013) of each ring unit (301) together define the first weakening cavity (31). The third segment (3013) of the previous ring unit (301) and the first segment (3011) of the next ring unit (301) define the second weakening cavity (32).

7. The telescopic device according to claim 6, characterized in that, The first segment (3011) extends axially along the fluid flow direction in the flow channel (10a) and radially outward in the flow channel (10a); the third segment (3013) extends axially along the fluid flow direction in the flow channel (10a) and radially outward in the flow channel (10a).

8. The expansion joint according to claim 2, characterized in that, The sealing ring (30) is an integral rubber structure formed by compression molding, injection molding or extrusion molding.

9. The telescopic device according to claim 1, characterized in that, The distance between the annular groove and the end of the body near the telescopic tube is 6~12mm.

10. The telescopic device according to claim 1, characterized in that, The body (10) is provided with a first assembly flange (11) for connecting to a valve at one end away from the telescopic pipe (20); the telescopic pipe (20) is provided with a second assembly flange (21) for connecting to a pipeline at one end away from the body (10).

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