A telescopic connection device for vacuum pipelines

Abstract

This utility model discloses a telescopic connection device for vacuum pipelines, belonging to the field of vacuum pipeline connections. It solves the problem that existing telescopic connection devices for vacuum pipelines are easily corroded and damaged by process gases, causing leaks. The technical solution includes a male pipe, which is movably connected to a first through-hole on a sealing seat and a second through-hole on a sealing nut. The sealing seat and sealing nut are detachably fixedly connected. The first and second through-holes cooperate with the male pipe. A dynamic sealing mechanism is also fitted onto the male pipe, coaxially arranged with it. The dynamic sealing mechanism is located within a cavity structure formed between the sealing nut and the bottom of the groove. A female pipe is also sealed to the sealing seat. A limiting groove is formed on the inner wall of the female pipe, and the male pipe is slidably connected to the limiting groove. The female pipe and male pipe are coaxially arranged, effectively avoiding vacuum pipeline leaks caused by corrosion. This utility model is applied to vacuum pipelines.

Description

Technical Field

[0001] This utility model provides a telescopic connection device for vacuum pipelines, belonging to the field of pipeline connection technology in vacuum systems. Background Technology

[0002] In the piping connection of a vacuum system, two core requirements must be met: first, good sealing and pressure resistance, which are the basis for ensuring the vacuum level of the system; second, in specific scenarios, it is necessary to have multiple compensation capabilities, including thermal expansion compensation, mechanical vibration and displacement compensation, and also to cope with axial length deviation and alignment error compensation that may occur during installation.

[0003] Against this backdrop, expansion joint technology has become a key component in vacuum engineering, with metal bellows connections being a commonly used solution. However, metal bellows have significant limitations: to ensure their core performance of easy expansion and contraction, their walls are typically thin, making them highly susceptible to corrosion and damage when in contact with gases, leading to system leaks.

[0004] Based on the above characteristics, for vacuum systems that transport or come into contact with corrosive gases, the use of metal bellows as expansion joints should be avoided. Instead, safer and more reliable alternative expansion joint methods should be explored and adopted to ensure the long-term stable operation of the system. Utility Model Content

[0005] To address the technical problem that existing retractable connection devices for vacuum pipelines are easily corroded and damaged by process gases, causing leaks, this invention proposes a retractable connection device for vacuum pipelines. This device can compensate for thermal expansion and displacement of the vacuum pipeline, as well as for axial length compensation during installation, and is both airtight and corrosion-resistant.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a telescopic connection device for vacuum pipeline, including a male pipe, which is movably connected to a first through hole opened on a sealing seat and a second through hole opened on a sealing nut. The sealing seat and the sealing nut are detachably fixedly connected, and the first through hole, the second through hole and the male pipe cooperate with each other. The sealing seat has a stepped groove, the groove and the first through hole are coaxially arranged and interconnected, the sealing nut has a first stepped limiting part protruding, the groove and the first stepped limiting part are detachably fixedly connected, and the first limiting shoulder on the inner side wall of the groove cooperates with the second limiting shoulder of the first stepped limiting part. The male tube is also fitted with a dynamic sealing mechanism, which is coaxially arranged with the male tube. The dynamic sealing mechanism is placed in the cavity structure formed between the sealing nut and the bottom of the groove. The dynamic sealing mechanism, the male tube, the sealing seat and the sealing nut cooperate with each other to form a vacuum sealing structure. The sealing seat is also sealed with a female tube. A limit groove is opened on the inner side wall of the female tube. The male tube is slidably connected to the limit groove. The female tube and the male tube are coaxially arranged.

[0007] Furthermore, the first through hole and the male pipe are fitted with a clearance fit, the second through hole and the male pipe are fitted with a clearance fit, and the first through hole, the second through hole and the male pipe are coaxially arranged.

[0008] Furthermore, the dynamic sealing mechanism includes two sealing rings, with a sealing sleeve pressed between the two sealing rings. One sealing ring abuts against the bottom of the groove, and the other sealing ring abuts against the sealing nut.

[0009] Furthermore, the main tube and the sealing seat are connected using a full-circumference continuous welding process.

[0010] Furthermore, the sealing seat is a hollow columnar structure.

[0011] The advantages of this invention compared to existing technologies are as follows: This invention, through the cooperation of a male pipe, female pipe, sealing seat, sealing nut, and dynamic sealing mechanism, eliminates the need for a thin-walled pipe structure to accommodate expansion and contraction, unlike traditional corrugated pipe connections. Furthermore, it allows for more flexible material selection, enabling the use of corrosion-resistant materials to meet the corrosion resistance requirements of vacuum pipelines. This effectively prevents leakage caused by corrosion, thus maintaining a stable vacuum environment. From a connection strength perspective, the structural design optimizes the mechanical properties of the connection points, ensuring good connection strength even under complex operating conditions. In addition, the device offers greater flexibility in axial adjustment, adapting to a wider range of thermal expansion and axial displacement requirements, providing a reliable guarantee for the safe and stable operation of the vacuum pipeline system. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; In the diagram: 1 is the male pipe, 2 is the female pipe, 3 is the sealing seat, 4 is the sealing ring, 5 is the sealing sleeve, 6 is the sealing gasket, and 7 is the sealing nut. Detailed Implementation

[0013] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0014] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0015] like Figures 1 to 2 As shown, this utility model provides a telescopic connection device for vacuum pipelines, including a male pipe 1. The male pipe 1 is rotatably or slidably connected to a first through hole opened on a sealing seat 3 and a second through hole opened on a sealing nut 7. The sealing seat 3 is a hollow columnar structure. The sealing seat 3 is threadedly connected to the sealing nut 7. The first through hole and the male pipe 1 are in clearance fit, and the second through hole and the male pipe 1 are in clearance fit. The first through hole, the second through hole and the male pipe 1 are coaxially arranged. The male pipe 1 can move along the axial direction of the first through hole and the second through hole.

[0016] Furthermore, the sealing seat 3 has a stepped groove, the groove and the first through hole are coaxially arranged and interconnected, the sealing nut 7 has a first stepped limiting part protruding, the groove is threadedly connected to the first stepped limiting part, and the first limiting shoulder on the inner side wall of the groove matches the second limiting shoulder of the first stepped limiting part.

[0017] A dynamic sealing mechanism is also fitted on the male pipe 1. The dynamic sealing mechanism is coaxially arranged with the male pipe 1 and is placed in the cavity structure formed between the sealing nut 7 and the bottom of the groove. The dynamic sealing mechanism, the male pipe 1, the sealing seat 3 and the sealing nut 7 cooperate with each other to form a vacuum sealing structure. The male pipe 1 and the female pipe 2 achieve vacuum sealing through the dynamic sealing mechanism.

[0018] Specifically, the dynamic sealing mechanism includes two sealing rings 4, with a sealing sleeve 5 pressed between them. One sealing ring 4 abuts against the bottom of the groove, and the other sealing ring 4 abuts against the sealing nut 7. When the male pipe 1 moves axially along the sealing seat 3, the two sealing rings 4 are deformed under pressure, and the dynamic sealing mechanism, the sealing seat 3, and the sealing nut 7 cooperate to achieve effective sealing.

[0019] The sealing seat 3 is also sealed with a female pipe 2. A limiting groove is formed on the inner side wall of the female pipe 2. The male pipe 1 is slidably connected to the limiting groove. The female pipe 2 and the male pipe 1 are coaxially arranged. In this embodiment, the female pipe 2 and the sealing seat 3 are connected by a full-circumference continuous welding process. The gap between the two is filled by a seamless weld to form a reliable sealing structure to prevent media leakage.

[0020] The depth of the limiting groove can be adjusted according to the actual working environment, and there is no limitation here.

[0021] The arrows in the diagram indicate the direction of activity for public management unit 1.

[0022] Compared to traditional corrugated pipe connections, the telescopic connection device for vacuum pipelines of this invention does not require the pipe wall to be designed as a thin-walled structure to accommodate telescopic needs. Furthermore, it has relatively relaxed requirements in terms of material selection, allowing for flexible selection of materials with corrosion-resistant properties in practical applications, thereby meeting the corrosion protection requirements of vacuum pipelines.

[0023] The working principle of this utility model: When the vacuum pipeline undergoes thermal expansion, axial displacement, or requires axial compensation during installation, the limiting grooves in the male pipe 1 and female pipe 2 slide, and the dynamic sealing mechanism deforms. The dynamic sealing mechanism, sealing seat 3, and sealing nut 7 cooperate to achieve effective sealing and simultaneously achieve the purpose of telescopic connection. Compared with traditional corrugated pipe connections, the telescopic connection device for vacuum pipelines of this utility model is less susceptible to damage from corrosive process gases, which can lead to vacuum pipeline leakage and damage to the vacuum environment. It also has better connection strength, a wider adjustable range, and is safe and reliable.

[0024] Regarding the specific structure of this utility model, it should be noted that the connection relationships between the various component modules adopted in this utility model are definite and achievable. Except as specifically described in the embodiments, their specific connection relationships can bring about corresponding technical effects and solve the technical problems proposed by this utility model without relying on the execution of corresponding software programs. The models of the components, modules, and specific components appearing in this utility model, the connection methods between them, and the conventional usage methods and expected technical effects brought about by the above-mentioned technical features, unless specifically described, are all publicly disclosed content in patents, journal articles, technical manuals, technical dictionaries, and textbooks that can be obtained by those skilled in the art before the application date, or belong to conventional technology, common knowledge, and other existing technologies in this field. There is no need to elaborate, which makes the technical solution provided in this case clear, complete, and achievable, and can reproduce or obtain corresponding physical products based on this technical means.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A telescoping connection device for a vacuum line, characterized by: Includes male pipe (1), which is movably connected to the first through hole opened on the sealing seat (3) and the second through hole opened on the sealing nut (7). The sealing seat (3) and the sealing nut (7) are detachably fixedly connected. The first through hole, the second through hole and the male pipe (1) cooperate with each other. The sealing seat (3) has a stepped groove. The groove and the first through hole are coaxially arranged and interconnected. The sealing nut (7) has a first stepped limiting part protruding. The groove and the first stepped limiting part are detachably fixedly connected. The first limiting shoulder on the inner side wall of the groove cooperates with the second limiting shoulder of the first stepped limiting part. A dynamic sealing mechanism is also fitted on the male pipe (1). The dynamic sealing mechanism is coaxially arranged with the male pipe (1). The dynamic sealing mechanism is placed in the cavity structure formed between the sealing nut (7) and the bottom of the groove. The dynamic sealing mechanism, the male pipe (1), the sealing seat (3) and the sealing nut (7) cooperate with each other to form a vacuum sealing structure. The sealing seat (3) is also sealed with a female tube (2). A limiting groove is opened on the inner side wall of the female tube (2). The male tube (1) is slidably connected to the limiting groove. The female tube (2) and the male tube (1) are coaxially arranged.

2. A telescoping connection for a vacuum line according to claim 1, characterized in that: The first through hole is clearance-fitted with the male pipe (1), the second through hole is clearance-fitted with the male pipe (1), and the first through hole, the second through hole and the male pipe (1) are coaxially arranged.

3. A telescoping connection for a vacuum line according to claim 1, wherein: The dynamic sealing mechanism includes two sealing rings (4), and a sealing sleeve (5) is pressed between the two sealing rings (4). One of the sealing rings (4) abuts against the bottom of the groove, and the other sealing ring (4) abuts against the sealing nut (7).

4. A telescoping connection for a vacuum line according to claim 1, wherein: The main tube (2) and the sealing seat (3) are connected by a full-circumference continuous welding process.

5. A telescoping connection for a vacuum line according to claim 1, wherein: The sealing seat (3) is a hollow columnar structure.

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