Mechanical maze expansion device

Abstract

The present invention discloses a mechanical labyrinth expansion device, comprising a first fixed joint, a movable joint, and a second fixed joint, which are sealed and arranged in sequence from top to bottom on the outer wall of a vertical pipe; the upper section of the first fixed joint is located on the outside and is configured to be compressed and sealed with the upper section of the movable joint located on the inside under the action of temperature expansion; the lower section of the first fixed joint is located on the outside and is compressed and sealed with the middle section of the movable joint located on the inside under the action of gravity; the lower section of the movable joint is located on the outside and is compressed and sealed with the lower section of the second fixed joint located on the inside under the action of gravity; the middle section of the movable joint is located on the outside and is configured to be compressed and sealed with the upper section of the second fixed joint located on the inside under the action of temperature expansion; wherein the movable joint is one or more sections. The mechanical labyrinth expansion device has a simple structure, is easy and quick to manufacture and install, is low in cost, and has a good sealing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering construction, and in particular to a mechanical labyrinth expansion device. Background Art

[0002] In engineering construction, especially for large heat pipes, high fluid temperatures can generate significant thermal stress during operation. Therefore, the pipes are often disconnected from their fixed components during design. Instead, specialized devices, such as expansion joints, are often installed. While these devices can address the issue of expansion stress, they are relatively expensive and complex to manufacture, requiring specialized manufacturers.

[0003] Therefore, it is urgent to provide a device that is simple to manufacture, has low investment cost, and shortens delivery time to solve the above technical problems. Summary of the Invention

[0004] The object of the present invention is to provide a mechanical labyrinth expansion device, which has a simple structure, is easy and quick to manufacture and install, has a low cost, and has a good sealing effect.

[0005] In order to achieve the above-mentioned objectives, the present invention provides a mechanical labyrinth expansion device, which includes a first fixed joint, a movable joint and a second fixed joint, and the first fixed joint, the movable joint and the second fixed joint are sealed and arranged on the outer wall of the vertical pipe in sequence from top to bottom; the upper section of the first fixed joint is located on the outside and is arranged to be able to be pressed and sealed with the upper section of the movable joint located on the inside under the action of temperature expansion, the lower section of the first fixed joint is located on the outside and is pressed and sealed with the middle section of the movable joint located on the inside under the action of gravity; the lower section of the movable joint is located on the outside and is pressed and sealed with the lower section of the second fixed joint located on the inside under the action of gravity, the middle section of the movable joint is located on the outside and is arranged to be able to be pressed and sealed with the upper section of the second fixed joint located on the inside under the action of temperature expansion; wherein, the movable joint is one section or multiple sections.

[0006] Preferably, the position close to the lower end of the first fixed joint is sealed to the movable joint through a first sealing strip.

[0007] Preferably, the position near the upper end of the movable joint is sealed to the first fixed joint via a second sealing strip assembly, and the position near the lower end of the movable joint is sealed to the second fixed joint via a third sealing strip assembly.

[0008] Preferably, the position close to the upper end of the second fixed joint is sealed to the movable joint through a fourth sealing strip.

[0009] Preferably, the first fixed joint, the movable joint and the second fixed joint are special-shaped joints, and the first sealing strip assembly, the second sealing strip assembly, the third sealing strip assembly and the fourth sealing strip assembly are all arranged on the straight sections of the special-shaped joints.

[0010] Preferably, each group of sealing strips is formed by welding annular flat steel.

[0011] Preferably, each set of sealing strips is staggered from top to bottom on the sealing surface.

[0012] According to the above technical solution, the present invention seals the first fixed joint, the movable joint and the second fixed joint from top to bottom on the outer wall of the vertical pipe, with the lower section of the first fixed joint located on the outside and pressed and sealed against the upper section of the movable joint located on the inside, and the lower end of the movable joint located on the outside and pressed and sealed against the upper section of the second fixed joint located on the inside. In this way, when the machine is in a cold state, the lower section 2 (such as Figure 1 The area between the second sealing strip and the first sealing strip shown in FIG), surface 4 (as shown in FIG Figure 1 The parallel surfaces of the fourth sealing strip and the third sealing strip shown in FIG are pressed against each other under the action of gravity. After operation, in the hot state, surface 1 (as shown in FIG Figure 1 The upper area of the second sealing group strip shown in FIG), surface 3 (as shown in FIG Figure 1 The parallel surfaces of the fourth sealing assembly (shown above the strip in the fourth sealing assembly) are compressed against each other by gravity. Under thermal conditions, when the load expansion distance is small, surface 4 fails first, while surface 3 assumes the sealing function. When the load expansion distance is large, surface 2 fails first, while surface 1 assumes the sealing function. Furthermore, the movable joint can be one or more, and can be removed or added depending on the designed expansion range to increase the expansion range of the device.

[0013] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is a structural schematic diagram of the mechanical labyrinth expansion device provided by the present invention.

[0016] Description of Reference Numerals

[0017] 1-First fixed section 2-Active section

[0018] 3-Second fixed section 1-1-First sealing strip

[0019] 2-1-Second sealing strip 2-2-Third sealing strip

[0020] 3-1-Fourth sealing strip DETAILED DESCRIPTION

[0021] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0022] In the present invention, unless otherwise stated, directional words such as "upper, lower, inside, outside" contained in a term merely represent the orientation of the term in normal usage, or are common names understood by those skilled in the art, and should not be regarded as limitations on the term.

[0023] See also Figure 1 The present invention provides a mechanical labyrinth expansion device, which includes a first fixed section 1, a movable section 2, and a second fixed section 3. The first fixed section 1, the movable section 2, and the second fixed section 3 are sealed and arranged on the outer wall of the vertical pipe from top to bottom; the upper section of the first fixed section 1 is located on the outside and is arranged to be pressed and sealed with the upper section of the movable section 2 located on the inside under the action of temperature expansion (i.e. Figure 1 The middle surface 1 can be pressed and sealed together under the action of temperature expansion), the lower section of the first fixed section 1 is located on the outside and is pressed and sealed together with the middle section of the movable section 2 located on the inside under the action of gravity (i.e. Figure 1 The middle surface 2 can be pressed and sealed together under the action of gravity); the lower section of the movable section 2 is located on the outside and is pressed and sealed together with the lower section of the second fixed section 3 located on the inside under the action of gravity (i.e. Figure 1 The middle surface 4 can be pressed and sealed together under the action of gravity), the middle section of the movable section 2 is located on the outside and is arranged with the upper section of the second fixed section 3 located on the inside to be pressed and sealed together under the action of temperature expansion (i.e. Figure 1 The middle surface 3 can be pressed and sealed against each other under the action of temperature expansion); wherein, the movable joint 2 is one or more joints.

[0024] Through the above technical solution, the first fixed joint 1, the movable joint 2 and the second fixed joint 3 are sealed and arranged on the outer wall of the vertical pipe from top to bottom, the lower section of the first fixed joint 1 is located on the outside and is pressed and sealed with the upper section of the movable joint 2 located on the inside, and the lower end of the movable joint 2 is located on the outside and is pressed and sealed with the upper section of the second fixed joint 3 located on the inside. In this way, when the machine is running in the cold state, the bottom 2 (such as Figure 1 The area between the second sealing strip 2-1 and the first sealing strip 1-1 shown in FIG), surface 4 (as shown in FIG Figure 1The parallel surfaces of the fourth sealing strip 3-1 and the third sealing strip 2-2 shown in FIG are pressed against each other under the action of gravity. After operation, in the hot state, surface 1 (such as Figure 1 The upper area of the second sealing group strip 2-1 shown in FIG), surface 3 (as shown in FIG Figure 1 The parallel surfaces of the fourth sealing assembly (shown above strip 3-1 in the figure) are compressed against each other by gravity. Under thermal conditions, when the load expansion distance is small, surface 4 fails first, while surface 3 assumes the sealing function. When the load expansion distance is large, surface 2 fails first, while surface 1 assumes the sealing function. Furthermore, the movable joint can be one or more, which can be eliminated or added depending on the designed expansion range to increase the expansion range of the device.

[0025] In addition, in order to further improve the sealing effect of the mechanical labyrinth expansion device, preferably, the position near the lower end of the first fixed node 1 is sealed and connected to the movable node 2 through the first sealing strip 1-1.

[0026] At the same time, the position near the upper end of the movable joint 2 is sealed to the first fixed joint 1 through the second sealing strip 2-1, and the position near the lower end of the movable joint 2 is sealed to the second fixed joint 3 through the third sealing strip 2-2.

[0027] Furthermore, the position close to the upper end of the second fixed joint 3 is sealed and connected to the movable joint 2 through the fourth sealing strip 3 - 1 .

[0028] Among them, in order to make the contact area between the first fixed joint 1, the movable joint 2 and the second fixed joint 3 larger and the labyrinth sealing effect better, it is preferred that the first fixed joint 1, the movable joint 2 and the second fixed joint 3 are special-shaped joints (the specific shape and structure can be designed or selected according to specific usage needs, as long as they can form a labyrinth sealing surface), and the first sealing group strip 1-1, the second sealing group strip 2-1, the third sealing group strip 2-2 and the fourth sealing group strip 3-1 are all arranged on the straight section of the special-shaped joint.

[0029] In this embodiment, each of the above-mentioned sealing strip groups is formed by welding annular flat steel.

[0030] In addition, each set of sealing strips is staggered from top to bottom on the sealing surface, so that double sealing is achieved by adopting the two forms of sealing strips and parallel double-sided sealing.

[0031] During actual installation and use, after the first fixed section 1, movable section 2, and second fixed section 3 are fabricated as shown, a crane is used to weld the first fixed section 1 to the designed air duct. The movable section 2 and second fixed section 3 below will have sealed themselves due to their own weight. At this point, the second fixed section 3 can be welded to the corresponding pipe below. This way, after thermal expansion, the sealing surface of surface 4 fails first, and surface 3 then takes over the sealing function. Then, the sealing surface of surface 2 fails first, and surface 1 takes over the sealing function.

[0032] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0033] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0034] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A mechanical labyrinth expansion device, characterized in that: The mechanical labyrinth expansion device comprises a first fixed joint (1), a movable joint (2) and a second fixed joint (3), wherein the first fixed joint (1), the movable joint (2) and the second fixed joint (3) are sealed and arranged on the outer wall of the vertical pipe in sequence from top to bottom; the upper section of the first fixed joint (1) is located on the outside and is configured to be pressed and sealed with the upper section of the movable joint (2) located on the inside under the action of temperature expansion, the lower section of the first fixed joint (1) is located on the outside and is pressed and sealed with the middle section of the movable joint (2) located on the inside under the action of gravity; the lower section of the movable joint (2) is located on the outside and is pressed and sealed with the lower section of the second fixed joint (3) located on the inside under the action of gravity, the middle section of the movable joint (2) is located on the outside and is configured to be pressed and sealed with the upper section of the second fixed joint (3) located on the inside under the action of temperature expansion; wherein the movable joint (2) is one or more sections.

2. The mechanical labyrinth expansion device according to claim 1, characterized in that: A position close to the lower end of the first fixed joint (1) is sealed and connected to the movable joint (2) via a first sealing strip assembly (1-1).

3. The mechanical labyrinth expansion device according to claim 2, characterized in that: The position close to the upper end of the movable joint (2) is sealed and connected to the first fixed joint (1) via a second sealing strip (2-1), and the position close to the lower end of the movable joint (2) is sealed and connected to the second fixed joint (3) via a third sealing strip (2-2).

4. The mechanical labyrinth expansion device according to claim 3, characterized in that: A position close to the upper end of the second fixed joint (3) is sealed and connected to the movable joint (2) via a fourth sealing strip (3-1).

5. The mechanical labyrinth expansion device according to claim 4, characterized in that: The first fixed joint (1), the movable joint (2) and the second fixed joint (3) are special-shaped joints, and the first sealing strip (1-1), the second sealing strip (2-1), the third sealing strip (2-2) and the fourth sealing strip (3-1) are all arranged on the straight sections of the special-shaped joints.

6. The mechanical labyrinth expansion device according to claim 5, characterized in that: Each group of sealing strips is formed by welding annular flat steel.

7. The mechanical labyrinth expansion device according to claim 5, characterized in that: Each set of sealing strips is staggered from top to bottom on the sealing surface.

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