A steam pipe rotary compensator capable of automatic compensation

Abstract

The utility model discloses a steam pipeline rotary compensator can automatically make compensation, aims at solving the displacement change problem of steam pipeline in prior art because of temperature change. The device comprises compensator body, adjustable spacing's upper flange and lower flane, and the compensation of pipeline displacement is realized in advance through adjusting flange spacing, and the compensation cavity is formed, and the installation of packing gland, sealing packing, sliding cover and disc spring group is convenient. Packing gland and sealing packing are installed in the compensation cavity, and the sealing pair is formed to prevent steam leakage, and the automatic compensation mechanism is composed of sliding gland and disc spring group, and the compression degree of sealing pair can be automatically adjusted according to pipeline displacement. The utility model can automatically and constantly compress sealing packing, compensates the preload loss caused by the wear and compaction deformation, ensures that the sealing pair is always in good sealing state, and realizes the automatic compensation function without shutdown maintenance.

Description

Technical Field

[0001] This utility model relates to the field of steam pipeline technology, and in particular to a steam pipeline rotary compensator that can automatically compensate. Background Technology

[0002] Rotary compensators are key components that absorb thermal displacement in pipelines through the relative rotation between spherical or conical sealing surfaces, and are widely used in thermal and steam pipelines. Their seals typically employ a stuffing box structure, relying on the initial tightening of the packing (such as flexible graphite) by the gland bolts to achieve a seal. In high-pressure steam pipelines, the high pressure and temperature of the medium cause the packing to wear, undergo permanent compression deformation, and age, leading to a decrease in the sealing pressure and potentially causing steam leakage. Once a leak occurs, the system must be shut down and the gland bolts retightened or the packing replaced, which not only disrupts production continuity but also poses a risk of burns from high temperatures during maintenance. Existing technologies sometimes employ periodic manual tightening of bolts, failing to achieve real-time compensation; others utilize springs, but their simple structure results in limited compensation force, and the springs are prone to stress relaxation under prolonged high temperatures, affecting the compensation effect. Therefore, there is an urgent need for a device that can adapt to high-pressure and high-temperature conditions and provide stable and reliable automatic compensation. Utility Model Content

[0003] (1) Technical problems to be solved To address the aforementioned problems in the prior art and to overcome its shortcomings, this utility model provides a steam pipeline rotary compensator that can be reasonably manufactured and used and can automatically compensate.

[0004] (2) Technical solution To achieve the above technical objectives, this utility model provides a steam pipe rotary compensator that can automatically compensate, including a compensator body. One end of the compensator body is fixedly installed with an upper flange, and the other end is movably installed with a lower flange. The bottom of the lower flange can be inserted into the bottom cavity of the upper flange, and the distance between the upper flange and the lower flange is adjustable. The bottom cavity of the upper flange fits with the bottom of the lower flange to form a compensation cavity. A stuffing box and sealing packing are installed on the side of the compensation cavity away from the lower flange. The stuffing box and sealing packing together constitute a sealing pair. An automatic compensation mechanism is sleeved on the outside of the sealing pair. The automatic compensation mechanism can move axially to press the sealing pair. The automatic compensation mechanism includes a sliding cover and a disc spring assembly. The inward side of the disc spring assembly abuts against one end of the sliding cover, and the outward side abuts against the bottom of the lower flange.

[0005] Preferably, the other end of the sliding gland abuts against the sealing packing.

[0006] Preferably, a limiting pressure plate is provided between the sliding cover and the sealing pair to ensure the sliding cover moves to the correct position and restrict its movement.

[0007] Preferably, a partition is provided between the disc spring assembly and the lower flange, and a protective layer is provided on the side of the lower flange facing the compensation cavity.

[0008] Preferably, both the upper flange and the lower flange are provided with high-temperature guide rings at their bottoms.

[0009] Preferably, a double-ended stud passes through both the upper and lower flanges, and the two outward-facing ends of the double-ended stud are tightened with lock nuts.

[0010] Preferably, the disc spring assembly is made of high-temperature alloy materials such as Inconel 718 or 60Si2CrVAT.

[0011] (3) Beneficial effects The advantages of this utility model are: It features a fully automatic compensation structure: using a butterfly spring group formed by several disc springs, the preload of the butterfly spring group serves as the power source, and responds instantly when the packing sealing force decreases, automatically pushing the sliding gland for compensation without manual intervention or external power. Large and stable compensation force: The disc spring assembly has the characteristics of large compensation force, small size and high stiffness. The compensation force provided is sufficient to meet the sealing requirements of high pressure steam, and its force-displacement characteristic curve is flat, which can provide a nearly constant sealing specific pressure. Excellent high temperature resistance: The key elastic element, the disc spring, is made of high-temperature alloy material, such as Inconel 718 or 60Si2CrVAT, which has good resistance to high temperature relaxation and creep, ensuring the reliability of long-term operation in high-temperature steam environments. Safe and reliable: The entire automatic compensation mechanism is resistant to high temperature and high pressure, with no risk of failure; Extended maintenance cycle: The automatic compensation mechanism greatly extends the sealing life of the packing, enabling the compensator to operate for up to several years without maintenance, reducing operation and maintenance costs and safety risks; It also features manual adjustment: the preload of the disc spring assembly can be precisely set during initial installation or after major overhaul using the locking nut on the outside, offering good flexibility. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments. Wherein: Figure 1 This is a cross-sectional view of the overall structure of this utility model; Figure 2 for Figure 1 A magnified structural diagram of part A in the middle; Figure 3 for Figure 1 A separate enlarged schematic diagram of the lower flange section.

[0013] The attached figures are labeled as follows: The compensator body (1), upper flange (2), compensation cavity (21), stuffing box (211), sealing packing (212), sliding gland (213), disc spring assembly (214), partition (22), limiting pressure plate (23), lower flange (3), high temperature guide ring (4), double-ended stud (5), locking nut (6). Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Example

[0015] Please see Figure 1 As shown, an embodiment of the automatic compensation steam pipe rotary compensator of the present invention includes a compensator body 1. An upper flange 2 is fixedly installed at one end of the compensator body 1, and a lower flange 3 is movably installed at the other end. The bottom of the lower flange 3 can be inserted into the bottom cavity of the upper flange 2, and the distance between the upper flange 2 and the lower flange 3 is adjustable. The bottom cavity of the upper flange 2 fits with the bottom of the lower flange 3 to form a compensation cavity 21. A stuffing box 211 and a sealing packing 212 are installed on the side of the compensation cavity 21 away from the lower flange 3. The stuffing box 211 and the sealing packing 212 together constitute a sealing pair. An automatic compensation mechanism is sleeved on the outside of the sealing pair. The automatic compensation mechanism can move axially to press the sealing pair. The automatic compensation mechanism includes a sliding cover 213 and a disc spring assembly 214. The inward side of the disc spring assembly 214 abuts against one end of the sliding cover 213, and the outward side abuts against the bottom of the lower flange 3. The other end of the sliding cover 213 abuts against the sealing packing 212. A limiting pressure plate 23 is provided between the sliding cover 213 and the sealing pair, i.e., between the sealing packing 212, to ensure the sliding cover 213 moves and restricts its movement. In order to improve the overall structure's resistance to high-temperature relaxation and creep, and to ensure the reliability of long-term operation in a high-temperature steam environment, the disc spring assembly 214 is made of high-temperature alloy materials such as Inconel 718 or 60Si2CrVAT.

[0016] In order to effectively achieve limiting and protection, a partition plate 22 is provided between the disc spring assembly 214 and the lower flange 3, a protective layer is provided on the side of the lower flange 3 facing the compensation cavity 21, and a high temperature guide ring 4 is provided at the bottom of both the upper flange 2 and the lower flange 3. In order to make the spacing between the upper flange 2 and the lower flange 3 adjustable, the upper flange 2 and the lower flange 3 are connected by a double-ended stud 5, and the two outward ends of the double-ended stud 5 are tightened by a lock nut 6.

[0017] This utility model relates to an automatic compensation rotary compensator for steam pipelines. Its design aims to provide an automatic compensation mechanism that adapts to temperature changes and pipeline displacement, thereby ensuring the stability and safety of the steam pipeline system. The compensator includes a compensator body, an upper flange, and a lower flange. By adjusting the distance between the upper and lower flanges, compensation for thermal expansion or contraction of the pipeline can be achieved. A stuffing box and sealing packing are provided within the compensation chamber to form a sealing pair and prevent steam leakage. The automatic compensation mechanism includes a sliding gland and a disc spring assembly. When the pipeline shifts due to temperature changes, the disc spring assembly automatically adjusts the tightness of the sealing pair through the sliding gland to achieve automatic compensation for pipeline displacement. Furthermore, the compensator includes a limiting pressure plate and a partition plate to ensure the correct position and protection of the spring assembly, as well as a high-temperature guide ring and double-ended studs to improve the guiding stability and fixation of the compensator under high-temperature conditions. The entire system uses the axial movement of the automatic compensation mechanism to tighten the sealing pair, ensuring good sealing performance under various operating conditions. When the piping system experiences axial displacement due to thermal expansion and contraction, it causes relative movement between the upper and lower flanges, altering the distance between them. Therefore, before use, their positions are secured using studs and lock nuts. However, the principle of thermal expansion and contraction also exposes the sealing pair (composed of a stuffing box and sealing packing) installed in the compensation cavity to the risk of loosening and leakage. At this point, the automatic compensation mechanism installed in the compensation cavity begins to function; the disc spring assembly generates elastic restoring force under the preload, continuously pushing the sliding gland axially inward, thereby automatically and permanently compressing the sealing packing, compensating for the preload loss caused by wear and compaction deformation, ensuring that the sealing pair is always in a good sealing state, and achieving an automatic compensation function without downtime maintenance.

[0018] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rotary compensator for steam pipelines capable of automatic compensation, characterized in that, Includes a compensator body (1), one end of which is fixedly mounted with an upper flange (2), and the other end is movably mounted with a lower flange (3). The bottom of the lower flange (3) can be inserted into the bottom cavity of the upper flange (2), and the distance between the upper flange (2) and the lower flange (3) is adjustable. The bottom cavity of the upper flange (2) and the bottom of the lower flange (3) are fitted together to form a compensation cavity (21). A stuffing box (211) and a sealing packing (212) are installed on the side of the compensation cavity (21) away from the lower flange (3). The stuffing box (211) and the sealing packing (212) together constitute a sealing pair. An automatic compensation mechanism is sleeved on the outside of the sealing pair. The automatic compensation mechanism can move axially to press the sealing pair. The automatic compensation mechanism includes a sliding cover (213) and a disc spring assembly (214). The disc spring assembly (214) abuts against one end of the sliding cover (213) on its inward side and against the bottom of the lower flange (3) on its outward side.

2. The steam pipeline rotary compensator capable of automatic compensation according to claim 1, characterized in that, The other end of the sliding gland (213) abuts against the sealing packing (212).

3. A steam pipeline rotary compensator capable of automatic compensation according to claim 2, characterized in that, A limiting pressure plate (23) is provided between the sliding cover (213) and the sealing pair to ensure the sliding cover (213) moves to the correct position and restrict its movement.

4. A steam pipeline rotary compensator capable of automatic compensation according to claim 1, characterized in that, A partition (22) is provided between the disc spring assembly (214) and the lower flange (3), and a protective layer is provided on the side of the lower flange (3) facing the compensation cavity (21).

5. A steam pipeline rotary compensator capable of automatic compensation according to claim 1, characterized in that, Both the upper flange (2) and the lower flange (3) are provided with high-temperature guide rings (4) at their bottoms.

6. A steam pipeline rotary compensator capable of automatic compensation according to any one of claims 1-5, characterized in that, The upper flange (2) and the lower flange (3) pass together through a double-ended stud (5), and the two outward ends of the double-ended stud (5) are tightened by lock nuts (6).

7. A steam pipeline rotary compensator capable of automatic compensation according to claim 6, characterized in that, The disc spring assembly (214) is made of Inconel 718 or 60Si2CrVAT high-temperature alloy material.

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