Straight tube pressure balance type expansion joint with protection function

Abstract

The utility model relates to the technical field of expansion joint, and disclose a straight pipe pressure balance type expansion joint with protection function, including balance expansion joint, both sides of balance expansion joint all are fixedly connected with flange plate, the side fixedly connected with fixed lug plate of flange plate, the inside swing joint of fixed lug plate links to limited link, two the side fixedly connected with protection mechanism of flange plate close to each other, the side fixedly connected with detection mechanism of flange plate close to balance expansion joint, the utility model discloses balance expansion joint when telescoping and lengthening drive both sides flange plate close to each other or each other far away and remove, two flange plates close to each other or far away and drive first fixed cylinder and second fixed cylinder remove, further through first connecting ring and second connecting ring drive outer sealing cylinder and outer sealing cylinder remove, and when outer sealing cylinder and second connecting ring remove, inner sealing cylinder always is located in outer sealing cylinder, and the protection of balance expansion joint is carried out.

Description

Technical Field

[0001] This utility model relates to the field of expansion joint technology, and more specifically to a straight pipe pressure balance expansion joint with protective function. Background Technology

[0002] In industries such as petrochemicals, heating networks, power systems, and shipbuilding, pipeline systems often experience thermal stress and axial thrust due to temperature changes, mechanical vibrations, or equipment displacement during long-term operation. If this stress cannot be effectively released, it can lead to pipeline deformation, support damage, or even system leakage, seriously affecting production safety and equipment lifespan. To address these issues, pressure-balanced expansion joints have emerged. Their core design uses an internal balancing structure to convert the blind plate force generated by the medium pressure into internal system force, achieving self-balancing and significantly reducing the thrust requirements of external supports. Among them, straight-pipe pressure-balanced expansion joints are ideal for conveying steam, high-temperature gases, and corrosive fluids due to their advantages such as straight medium flow channels, low pressure drop, and no flow direction restrictions. While modern balanced expansion joints can maintain their own balance during use, they undergo repeated stretching and contraction. Therefore, if external manufacturing residues remain on the side of the balanced expansion joint, they can cause damage as the joint stretches and contracts. Furthermore, current balanced expansion joints cannot be used to detect leaks, resulting in low safety. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a straight pipe pressure balance expansion joint with protective function to solve the problems existing in the background art.

[0004] This utility model provides the following technical solution: a straight pipe pressure-balanced expansion joint with protective function, comprising a balanced expansion joint, flanges fixedly connected to both sides of the balanced expansion joint, fixed lugs fixedly connected to the sides of the flanges, a limit rod movably connected inside the fixed lugs, a protective mechanism fixedly connected to the sides of the two flanges close to each other, and a detection mechanism fixedly connected to the side of the flanges close to the balanced expansion joint; the protective mechanism includes a first fixed cylinder fixed to one side of the flange and a second fixed cylinder fixed to the other side of the flange, a first connecting ring fixedly connected to the side of the first fixed cylinder close to the second fixed cylinder, an outer sealing cylinder fixedly connected to the side of the first connecting ring away from the first fixed cylinder, a second connecting ring fixedly connected to the side of the second fixed cylinder close to the first fixed cylinder, and an inner sealing cylinder fixedly connected to the side of the second connecting ring away from the second fixed cylinder, the inner sealing cylinder being located inside the outer sealing cylinder.

[0005] Furthermore, there are two detection mechanisms, which are located on opposite sides above the balance expansion joint, and the sides of the balance expansion joint do not contact the interior of the protective mechanism.

[0006] Furthermore, both the first connecting ring and the second connecting ring are conical, and the diameter of the outer sealing cylinder is larger than the diameter of the first fixed cylinder, while the diameter of the inner sealing cylinder is larger than the diameter of the second fixed cylinder.

[0007] Furthermore, the interior of the inner sealing cylinder does not contact the side of the balance expansion joint, and the second connecting ring moves a distance greater than the extension distance of the balance expansion joint within the outer sealing cylinder.

[0008] Furthermore, the detection mechanism includes a threaded rod fixedly connected to a flange, a threaded cylinder threadedly connected to the side of the threaded rod, a detection head fixedly connected to the side of the threaded cylinder away from the threaded rod, and a sliding groove plate movably sleeved on the side of the threaded cylinder.

[0009] Furthermore, the slide plate rotates on the side of the threaded cylinder, and a sliding block is movably connected inside the slide plate. A fixing plate is fixedly connected to the side of the sliding block away from the slide plate, and the side of the fixing plate is fixedly connected to the side of the flange.

[0010] The technical effects and advantages of this utility model are as follows: 1. This utility model comprises a first fixed cylinder, a first connecting ring, an outer sealing cylinder, and an inner sealing cylinder. When the balance expansion joint expands and contracts, it causes the flanges on both sides to move closer or further apart. When the two flanges move closer or further apart, they cause the first fixed cylinder and the second fixed cylinder to move. In turn, the first connecting ring and the second connecting ring cause the outer sealing cylinder to move. When the outer sealing cylinder and the second connecting ring move, the inner sealing cylinder is always located inside the outer sealing cylinder, thus protecting the balance expansion joint.

[0011] 2. This utility model, by providing a threaded rod, a threaded cylinder, and a detection head, allows for detection of leaks in the balance expansion joint via the detection head. Furthermore, the rotatable slide plate, rotating on the side of the threaded rod, causes the threaded cylinder to move closer to or further away from the flange, thereby adjusting the distance between the detection head and the flange and ensuring the accuracy of the detection. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the overall structure of the protective mechanism of this utility model.

[0014] Figure 3This is an exploded view of the protective mechanism of this utility model.

[0015] Figure 4 This is a schematic diagram of the detection mechanism structure of this utility model.

[0016] Figure 5 This is an exploded view of the detection mechanism of this utility model.

[0017] The attached figures are labeled as follows: 1. Balanced expansion joint; 2. Flange; 3. Fixed lug; 4. Limiting rod; 5. Protective mechanism; 501. First fixed cylinder; 502. First connecting ring; 503. Outer sealing cylinder; 504. Second fixed cylinder; 505. Second connecting ring; 506. Inner sealing cylinder; 6. Detection mechanism; 601. Threaded rod; 602. Threaded cylinder; 603. Detection head; 604. Sliding plate; 605. Fixed plate; 606. Sliding block. Detailed Implementation

[0018] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] Reference Figure 1 and Figure 2 This utility model provides a straight pipe pressure balance expansion joint with protective function, including a balance expansion joint 1, flanges 2 fixedly connected to both sides of the balance expansion joint 1, fixed lugs 3 fixedly connected to the sides of the flanges 2, limit rods 4 movably connected inside the fixed lugs 3, protective mechanisms 5 fixedly connected to the sides of the two flanges 2 that are close to each other, and detection mechanisms 6 fixedly connected to the sides of the flanges 2 that are close to the balance expansion joint 1. There are two detection mechanisms 6, which are located on the two sides above the balance expansion joint 1 respectively. The sides of the balance expansion joint 1 do not contact the inside of the protective mechanism 5.

[0020] In this embodiment, the two detection mechanisms 6 are located on both sides above the balance expansion joint 1. Therefore, when the balance expansion joint 1 leaks, the two detection mechanisms 6 can perform a more comprehensive inspection. The side of the balance expansion joint 1 does not contact the inside of the protective mechanism 5, so that the protective mechanism 5 can play a protective role without colliding with the balance expansion joint 1, making this application more flexible in use.

[0021] Reference Figure 2 and Figure 3The protective mechanism 5 includes a first fixing cylinder 501 fixed to one side flange 2 and a second fixing cylinder 504 fixed to the other side flange 2. A first connecting ring 502 is fixedly connected to the side of the first fixing cylinder 501 near the second fixing cylinder 504, and an outer sealing cylinder 503 is fixedly connected to the side of the first connecting ring 502 away from the first fixing cylinder 501. A second connecting ring 505 is fixedly connected to the side of the second fixing cylinder 504 near the first fixing cylinder 501, and the second connecting ring 505 is fixedly connected to the side of the second fixing cylinder 504 away from the second fixing cylinder 504. An inner sealing cylinder 506 is fixedly connected to the side of the cylinder 504. The inner sealing cylinder 506 is located inside the outer sealing cylinder 503. The first connecting ring 502 and the second connecting ring 505 are both conical. The diameter of the outer sealing cylinder 503 is larger than the diameter of the first fixed cylinder 501, and the diameter of the inner sealing cylinder 506 is larger than the diameter of the second fixed cylinder 504. The interior of the inner sealing cylinder 506 does not contact the side of the balance expansion joint 1. The movement distance of the second connecting ring 505 inside the outer sealing cylinder 503 is greater than the extension distance of the balance expansion joint 1.

[0022] In this embodiment, when the balance expansion joint 1 extends or retracts, the outer sealing cylinder 503 and the inner sealing cylinder 506 move, while the inner sealing cylinder 506 is located inside the outer sealing cylinder 503. Therefore, when the outer sealing cylinder 503 and the second fixed cylinder 504 move relative to each other, the inner sealing cylinder 506 remains inside the outer sealing cylinder 503, thus protecting the balance expansion joint 1. The first connecting ring 502 and the second connecting ring 505 can stably connect the first fixed cylinder 501 and the outer sealing cylinder 503, and the second fixed cylinder 504 and the inner sealing cylinder 506. The movement distance of the second connecting ring 505 within the outer sealing cylinder 503 is greater than the extension or retraction distance of the balance expansion joint 1, ensuring that it always provides protection.

[0023] Reference Figure 4 and Figure 5 The testing mechanism 6 includes a threaded rod 601 fixedly connected to the flange 2. A threaded cylinder 602 is threadedly connected to the side of the threaded rod 601. A testing head 603 is fixedly connected to the side of the threaded cylinder 602 away from the threaded rod 601. A sliding plate 604 is movably sleeved on the side of the threaded cylinder 602. The sliding plate 604 rotates on the side of the threaded cylinder 602. A sliding block 606 is movably connected inside the sliding plate 604. A fixing plate 605 is fixedly connected to the side of the sliding block 606 away from the sliding plate 604. The side of the fixing plate 605 is fixedly connected to the side of the flange 2.

[0024] In this embodiment, when the threaded cylinder 602 moves to the side of the threaded rod 601, the slide plate 604 rotates to the side of the threaded cylinder 602, and the sliding block 606 slides within the slide plate 604, which serves as a limiting effect to prevent the threaded cylinder 602 from falling off. When the threaded cylinder 602 rotates to the side of the threaded rod 601, it will cause the threaded cylinder 602 to move closer to or further away from the flange 2, thereby causing the detection head 603 to move. This allows for detection at different positions, ensuring detection accuracy.

[0025] The working principle of this utility model is as follows: In use, the position of the balance expansion joint 1 is fixed by fixing the ear plate 3 and fixing the ear plate 3. At this time, the first fixed cylinder 501 and the second fixed cylinder 504 are respectively fixedly connected inside the two flanges 2. When the balance expansion joint 1 contracts and stretches, it will drive the flanges 2 on both sides to move closer or further away from each other. When the flanges 2 move, they will drive the first fixed cylinder 501 and the second fixed cylinder 504 to move. When the first fixed cylinder 501 and the second fixed cylinder 504 move, they will drive the first connecting ring 502 and the second connecting ring 505 to move, which in turn will drive the outer sealing cylinder 503 and the inner sealing cylinder 506 to move. The inner sealing cylinder 506 is located inside the outer sealing cylinder 503. Therefore, when the outer sealing cylinder 503 and the second fixed cylinder 504 move relative to each other, the inner sealing cylinder 506 is still located inside the outer sealing cylinder 503, thus protecting the balance expansion joint 1. A detection head 603 is provided above the balance expansion joint 1 to detect whether the balance expansion joint 1 is leaking. During the detection, the threaded cylinder 602 can be rotated. When the threaded cylinder 602 rotates on the side of the threaded rod 601, it will move closer to or away from the flange 2, which will drive the detection head 603 to move. Different positions can be detected. When the threaded cylinder 602 moves on the side of the threaded rod 601, the slide plate 604 rotates on the side of the threaded cylinder 602, and the sliding block 606 slides in the slide plate 604, which has a limiting effect and prevents the threaded cylinder 602 from falling.

[0026] In conclusion, the above are merely preferred embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A straight pipe pressure-balanced expansion joint with protective function, comprising a balanced expansion joint (1), characterized in that: Both sides of the balance expansion joint (1) are fixedly connected to flanges (2), and fixed lugs (3) are fixedly connected to the sides of the flanges (2). Limiting rods (4) are movably connected inside the fixed lugs (3). Protective mechanisms (5) are fixedly connected to the sides of the two flanges (2) that are close to each other. A detection mechanism (6) is fixedly connected to the side of the flanges (2) that is close to the balance expansion joint (1). The protective mechanism (5) includes a first fixing cylinder (501) that is fixed to one side of the flange (2) and a second fixing cylinder (501) that is fixed to the other side of the flange (2). 04), a first connecting ring (502) is fixedly connected to the side of the first fixed cylinder (501) near the second fixed cylinder (504), an outer sealing cylinder (503) is fixedly connected to the side of the first connecting ring (502) away from the first fixed cylinder (501), a second connecting ring (505) is fixedly connected to the side of the second fixed cylinder (504) near the first fixed cylinder (501), an inner sealing cylinder (506) is fixedly connected to the side of the second connecting ring (505) away from the second fixed cylinder (504), and the inner sealing cylinder (506) is located inside the outer sealing cylinder (503).

2. The straight pipe pressure-balanced expansion joint with protective function according to claim 1, characterized in that: The number of the detection mechanism (6) is two, and the two detection mechanisms (6) are located on both sides above the balance expansion joint (1), and the side of the balance expansion joint (1) does not contact the interior of the protective mechanism (5).

3. The straight pipe pressure-balanced expansion joint with protective function according to claim 1, characterized in that: Both the first connecting ring (502) and the second connecting ring (505) are conical, and the diameter of the outer sealing cylinder (503) is larger than the diameter of the first fixed cylinder (501), and the diameter of the inner sealing cylinder (506) is larger than the diameter of the second fixed cylinder (504).

4. A straight pipe pressure-balanced expansion joint with protective function according to claim 3, characterized in that: The interior of the inner sealing cylinder (506) does not contact the side of the balance expansion joint (1), and the second connecting ring (505) moves a greater distance than the extension distance of the balance expansion joint (1) within the outer sealing cylinder (503).

5. A straight pipe pressure-balanced expansion joint with protective function according to claim 1, characterized in that: The testing mechanism (6) includes a threaded rod (601) fixedly connected to the flange (2), a threaded cylinder (602) is threadedly connected to the side of the threaded rod (601), a testing head (603) is fixedly connected to the side of the threaded cylinder (602) away from the threaded rod (601), and a sliding groove plate (604) is movably sleeved on the side of the threaded cylinder (602).

6. A straight pipe pressure-balanced expansion joint with protective function according to claim 5, characterized in that: The slide plate (604) rotates on the side of the threaded cylinder (602). A sliding block (606) is movably connected inside the slide plate (604). A fixing plate (605) is fixedly connected to the side of the sliding block (606) away from the slide plate (604). The side of the fixing plate (605) is fixedly connected to the side of the flange (2).

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