Thermal insulation corrugated length adjuster

Abstract

The utility model relates to a kind of heat insulation corrugated length adjuster, including inner corrugated pipe 1 and outer corrugated pipe 2, and it is double-layer corrugated pipe inner cavity 3 between the inner corrugated pipe 1 and outer corrugated pipe 2, and the double-layer corrugated pipe inner cavity 3 is vacuum cavity.The beneficial effects of the utility model are: the vacuum heat insulation principle is used for corrugated pipe length adjuster, inner corrugated pipe and outer corrugated pipe are used, vacuum cavity is formed between inner corrugated pipe and outer corrugated pipe, the heat insulation effect of corrugated pipe length adjuster can be effectively improved, and the length adjustment function of corrugated pipe length adjuster is maintained, flow guide sleeve is arranged in corrugated pipe inner cylinder, and the damping generated by corrugated pipe to medium flow can be avoided.

Description

Technical Field

[0001] This utility model relates to industrial pipeline and valve connection technology, and in particular to a heat-insulated corrugated length adjuster. Background Technology

[0002] In industrial applications, valves are often required between two pieces of equipment or at pipeline connections. When the equipment and pipelines at both ends are fixed, initial valve installation or replacement becomes inconvenient because the installation space is tight, making it impossible to hoist the valve (especially large valves) or connect it to the equipment and pipelines. Therefore, in typical valve installation structures, a bellows adjuster is installed on one side of the valve to adjust the connection position between the equipment / pipeline and the valve, facilitating smooth installation and a tight connection to ensure a proper seal. When installing valves in pipelines requiring insulation, such as cryogenic pipelines, insulation is necessary to reduce cold loss. However, due to the expandability of the bellows adjuster, commonly used insulation methods are no longer suitable and can negatively impact the pipeline's insulation effectiveness. Utility Model Content

[0003] The purpose of this invention is to propose a heat-insulating corrugated pipe length adjuster to improve the heat preservation effect of the corrugated pipe length adjuster.

[0004] To achieve the above objectives, the technical solution of this utility model is: a heat-insulating corrugated length adjuster, comprising an inner corrugated pipe 1 and an outer corrugated pipe 2, wherein the inner corrugated pipe 1 and the outer corrugated pipe 2 are separated by a double-layer corrugated pipe cavity 3, and the double-layer corrugated pipe cavity 3 is a vacuum cavity.

[0005] Furthermore, in order to form a vacuum cavity, the two ends of the inner bellows 1 are connected to the inner bellows cylinder 4, the two ends of the outer bellows are connected to the outer bellows sleeve 5, the inner bellows cylinder 4 is provided with an annular flange 6, and the end of the outer bellows sleeve 5 is provided with an outer flange 7, which is mated with the annular flange 6.

[0006] Furthermore, in order to seal and insulate the vacuum cavity, a thermal insulation sealing gasket 8 is provided between the outer flange 7 and the ring flange 6.

[0007] Furthermore, the optional thermal insulation sealing gaskets include polyurethane gaskets, modified PTFE gaskets, or high-strength graphite composite gaskets.

[0008] Furthermore, in order to achieve and ensure the vacuum inside the double-walled bellows, the bellows jacket 5 is provided with a vacuum port 9 and a vacuum gauge port 10.

[0009] Furthermore, in order to adjust the length, the outer flange is provided with a tie rod hole 11, and an adjusting tie rod 12 is provided in the tie rod hole 11. The adjusting tie rod 12 passes through the outer flanges 7 at both ends of the outer bellows. The two ends of the adjusting tie rod 12 are provided with screws. The adjusting tie rod adjusts the distance L1 between the outer flanges at both ends of the outer bellows through the inner adjusting nut 13a and the outer adjusting nut 13b.

[0010] Furthermore, as a connection structure to pipes or equipment, the two ends of the inner corrugated pipe 1 are connected to the inner corrugated pipe cylinder 4, and the end of the inner corrugated pipe cylinder is provided with a pipe connection flange 14.

[0011] Furthermore, to prevent the inner bellows from damping the flow of the medium, the two ends of the inner bellows 1 are connected to the inner bellows cylinder 4, and the inner bellows cylinder 4 is provided with a flow guide sleeve 15, which extends into the two inner bellows cylinders 4.

[0012] Furthermore, a preferred flow guide sleeve structure is that the corrugated pipe inner cylinder consists of an upstream corrugated pipe inner cylinder 4a and a downstream corrugated pipe inner cylinder 4b, the flow guide sleeve 15 is welded to the upstream corrugated pipe inner cylinder 4, and the flow guide sleeve is clearance-fitted with the downstream corrugated pipe inner cylinder 4b.

[0013] Furthermore, in order to promote the flow of the medium, an electric heating device 16 is provided on the outer wall of the inner bellows.

[0014] The beneficial effects of this utility model are: applying the vacuum insulation principle to the bellows length adjuster, using an inner bellows and an outer bellows, with a vacuum cavity formed between the inner and outer bellows, which can effectively improve the insulation effect of the bellows length adjuster and maintain the length adjustment function of the bellows length adjuster. A flow guide sleeve is provided in the inner cylinder of the bellows, which can avoid the bellows from causing damping of the medium flow.

[0015] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is an end view of the present invention; Figure 2 yes Figure 1 The AA sectional view is a structural diagram of this utility model; Figure 3 yes Figure 2 A magnified view of part B; Figure 4 This is a structural diagram of the present invention, which includes an electric heating device. Detailed Implementation

[0017] Example 1: like Figures 1 to 3A heat-insulating corrugated length adjuster includes an inner corrugated pipe 1 and an outer corrugated pipe 2.

[0018] The inner bellows 1 is connected to the inner bellows cylinder 4 at both ends. The inner bellows 1 and the inner bellows cylinder 4 at both ends are welded together to form a telescopic structure.

[0019] The two ends of the outer corrugated pipe 2 are connected to the corrugated pipe jacket 5. The outer corrugated pipe 2 and the corrugated pipe jacket 5 at both ends are integrated to form a telescopic structure.

[0020] The inner bellows cylinder 4 is equipped with an annular flange 6, and the outer sleeve 5 is equipped with an outer flange 7 at its end. The outer flange 7 and the annular flange 6 are mated and fixed by bolts 20, forming a closed double-layer bellows inner cavity 3. An insulating bolt sleeve 21 is provided between the outer flange 7 and the annular flange 6 and the bolts 20 to prevent heat conduction between the outer flange and the annular flange through the bolts. In this embodiment, the insulating bolt sleeve 21 is made of PA66 nylon, which has good toughness, high compressive strength, and good insulation and heat insulation properties.

[0021] A thermal insulation gasket 8 is provided between the outer flange 7 and the ring flange 6. The thermal insulation gasket 8 seals the frame between the inner bellows 1 and the outer bellows 2, and prevents the temperature of the inner bellows from being conducted to the outer bellows, thus achieving the function of heat insulation.

[0022] The thermal insulation gasket 8 can be a polyurethane gasket, a modified PTFE gasket, or a high-strength graphite composite gasket. Polyurethane gaskets use high-density rigid polyurethane foam as the core material, with a three-dimensional honeycomb structure and a thermal conductivity as low as 0.028 W / (m•K). They operate in temperatures ranging from -196℃ to +120℃ and feature high compressive strength, low water absorption, and aging resistance. Modified PTFE gaskets use military-grade material formulations, maintaining a flexible seal even in extremely cold environments down to -196℃. They are corrosion-resistant and aging-resistant, suitable for sealing cryogenic equipment such as chemical plants and LNG storage tanks. High-strength graphite composite gaskets are cut from pure graphite plates or metal-reinforced graphite plates and can be used in temperatures ranging from -200℃ to +850℃. They exhibit good compression resilience and corrosion resistance and are widely used for flange and valve sealing in petroleum, chemical, and other industrial equipment. Between the inner bellows 1 and the outer bellows 2 lies a double-walled bellows cavity 3, which is a vacuum chamber. The outer bellows jacket 5 is equipped with a vacuum pump interface 9 and a vacuum gauge interface 10. The vacuum pump interface 9 is used to connect a vacuum pump to evacuate the double-walled bellows cavity 3. The vacuum gauge interface 10 is used to connect a vacuum gauge, allowing for continuous monitoring of the vacuum status. The interface can also be connected to a vacuum gauge with an alarm device; if the vacuum status is abnormal, an alarm signal will be issued to alert relevant personnel to promptly check for internal leaks.

[0023] The inner end of the corrugated pipe is provided with a pipe connection flange 14, which is used to connect to pipes or equipment.

[0024] The outer flange 7 has four tie rod holes 11, which are evenly distributed around the circumference of the outer flange 7. Adjusting tie rods 12 are installed in the tie rod holes 11. A total of four adjusting tie rods 12 pass through the outer flanges 7 at both ends of the outer bellows. The two ends of the adjusting tie rods 12 are provided with screws 12a. The screws 12a are provided with inner adjusting nuts 13a and outer adjusting nuts 13b. The inner adjusting nuts 13a fix the outer flange 7 on the inside, and the outer adjusting nuts 13b fix the outer flange 7 on the outside, so that the adjusting tie rods 12 can adjust the distance L1 between the outer flanges 7 at both ends of the outer bellows, thereby adjusting the distance L between the two pipe connecting flanges 14.

[0025] A flow guide sleeve 15 is provided in the inner bellows cylinder 4, extending into both inner bellows cylinders 4. Depending on the direction of medium flow, the inner bellows cylinder can be divided into an upstream inner bellows cylinder 4a and a downstream inner bellows cylinder 4b, with the medium flowing from the upstream inner bellows cylinder 4a to the downstream inner bellows cylinder 4b. The flow guide sleeve 15 is welded to the upstream inner bellows cylinder 4, and the flow guide sleeve is clearance-fitted to the downstream inner bellows cylinder 4b. The flow guide sleeve prevents the medium from contacting the inner bellows 1 during flow, thus preventing the inner bellows 1 from damping the medium flow.

[0026] In this embodiment, the heat-insulating corrugated elongator adjusts the distance L between the two pipe connecting flanges 14 by adjusting the tie rod 12. Taking valve installation or replacement as an example, loosening the inner adjusting nut 13a and tightening the outer adjusting nut 13b at one end of the tie rod compresses the corrugated pipe, shortening the distance L between the two pipe connecting flanges 14 and providing the necessary space for valve installation. After one end of the valve is connected and fixed to the pipe (or equipment), loosen the outer adjusting nut 13b at one end of the tie rod again. The heat-insulating corrugated elongator extends, and the pipe connecting flange 14 aligns with the valve, thus connecting and fixing the pipe connecting flange 14 to the valve. Finally, lock both the inner adjusting nut 13a and the outer adjusting nut 13b on the tie rod 12.

[0027] This invention effectively compensates for axial dimensional errors during pipeline installation by adjusting the tie rod, preventing additional stress on pipelines and equipment during assembly and disassembly, and improving the sealing reliability and service life of pipelines and equipment. The vacuum cavity composed of double-layer corrugated pipes effectively improves the heat insulation effect of the corrugated pipe length adjuster, preventing the reduction or failure of the insulation layer effect due to structural expansion and contraction. This invention is particularly suitable for working environments with limited space or high precision requirements, and is easy to operate without additional tools.

[0028] Example 2: like Figure 4An insulated corrugated length adjuster, this embodiment is a functional improvement of embodiment one. It includes an inner corrugated pipe 1 and an outer corrugated pipe 2.

[0029] In this embodiment, an electric heating device 16 is provided on the outer wall of the inner corrugated pipe 1. The electric heating device 16 can be an electric heating wire or a heating tape wound on the outer wall of the inner corrugated pipe.

[0030] A sealing interface 17 is provided on the outer shell 5 of the corrugated pipe, and the power cord 18 of the electric heating device 16 is led into the inner cavity 3 of the double-layer corrugated pipe through the sealing interface 17.

[0031] For some low-temperature pipelines with high medium viscosity, there may be medium residue in the pipeline when it is started. The electric heating device 16 is used to heat the medium so that it can flow. After the medium in the pipeline is running normally, the electric heating device 16 is turned off.

Claims

1. A heat-insulating corrugated length adjuster, characterized in that, It includes an inner corrugated pipe (1) and an outer corrugated pipe (2), and there is a double-layer corrugated pipe cavity (3) between the inner corrugated pipe (1) and the outer corrugated pipe (2), and the double-layer corrugated pipe cavity (3) is a vacuum cavity.

2. The heat-insulating corrugated length adjuster according to claim 1, characterized in that, The inner bellows (1) is connected to the inner bellows cylinder (4) at both ends, and the outer bellows is connected to the outer bellows sleeve (5) at both ends. The inner bellows cylinder (4) is provided with an annular flange (6), and the end of the outer bellows sleeve (5) is provided with an outer flange (7). The outer flange (7) is connected to the annular flange (6).

3. The heat-insulating corrugated length adjuster according to claim 2, characterized in that, A thermal insulation sealing gasket (8) is provided between the outer flange (7) and the ring flange (6).

4. The heat-insulating corrugated elongator according to claim 3, characterized in that, The thermal insulation sealing gasket (8) is a polyurethane sealing gasket, a modified PTFE sealing gasket, or a high-strength graphite composite sealing gasket.

5. The heat-insulating corrugated length adjuster according to claim 2, characterized in that, The bellows jacket (5) is provided with a vacuum port (9) and a vacuum gauge port (10).

6. The heat-insulating corrugated length adjuster according to claim 2, characterized in that, The outer flange is provided with a tie rod hole (11), and an adjusting tie rod (12) is provided in the tie rod hole (11). The adjusting tie rod (12) passes through the outer flanges (7) at both ends of the outer bellows. The two ends of the adjusting tie rod (12) are provided with screws. The adjusting tie rod adjusts the distance (L1) between the outer flanges at both ends of the outer bellows by means of an inner adjusting nut (13a) and an outer adjusting nut (13b).

7. The heat-insulating corrugated length adjuster according to claim 1, characterized in that, The two ends of the inner corrugated pipe (1) are connected to the inner corrugated pipe cylinder (4), and the end of the inner corrugated pipe cylinder is provided with a pipe connection flange (14).

8. The heat-insulating corrugated length adjuster according to claim 1, characterized in that, The two ends of the inner corrugated pipe (1) are connected to the inner corrugated pipe cylinder (4), and the inner corrugated pipe cylinder (4) is provided with a flow guide sleeve (15), which extends into the two inner corrugated pipe cylinders (4).

9. The heat-insulating corrugated length adjuster according to claim 8, characterized in that, The corrugated inner cylinder consists of an upstream corrugated inner cylinder (4a) and a downstream corrugated inner cylinder (4b). The flow guide sleeve (15) is welded to the upstream corrugated inner cylinder (4a), and the flow guide sleeve is clearance-fitted with the downstream corrugated inner cylinder (4b).

10. The heat-insulating corrugated elongator according to claim 1, characterized in that, An electric heating device (16) is provided on the outer wall of the inner bellows.

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