Straight pipe pressure balance type expansion joint in chemical industry

Abstract

The utility model discloses a straight pipe pressure balance type expansion joint in the chemical industry, which belongs to the field of pipeline connecting parts and comprises an expansion joint body, connecting discs are fixedly connected to the upper end and the lower end of the expansion joint body respectively, and inner connecting discs are mounted at the ends, close to each other, of the two connecting discs respectively. A rubber flexible deformable outer cylinder is fixedly connected between the two inner connecting discs, an electric annular guide rail is fixedly connected to the upper side of the inner connecting disc located at the lower end, an upper sliding transverse groove block is slidably connected to the lower end of each inner connecting disc, an electric winder is fixedly connected to the upper inner wall of each upper sliding transverse groove block, and a displacement rope is wound around the outer end of each electric winder. According to the expansion joint, a rubber flexible deformable outer cylinder capable of being matched with elastic displacement can be arranged outside the expansion joint body, whether the leakage risk occurs or not can be detected on the outer circumference of the expansion joint body in an annular mode through the cooperation of the gas sensor, and the operation safety of the expansion joint body and a chemical pipeline connected with the expansion joint body can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of pipeline connection components, and more specifically to a straight pipe pressure balance expansion joint in the chemical industry. Background Art

[0002] An expansion joint refers to a flexible element that can effectively compensate for axial deformation. For example, the expansion joint welded on the fixed tube sheet heat exchanger shell has large axial flexibility and is easy to deform. It can compensate for the thermal expansion difference between the tube and the shell due to different wall temperatures, reduce their axial load, and thus reduce the temperature difference stress of the tube, tube sheet and shell, avoiding strength damage, instability damage and tube pull-off damage. There are many types of expansion joints, and the commonly used ones are corrugated, ring plate welding and sandwich shell structures. Among them, the corrugated expansion joint is the most widely used, and the ring plate welding expansion joint is only suitable for normal pressure or low pressure occasions.

[0003] During the use of straight pipe pressure-balanced expansion joints in the chemical industry, once the expansion joint body and the chemical pipeline connected to it have leakage risks, it will cause serious safety accidents. Therefore, it is necessary to design a straight pipe pressure-balanced expansion joint with leakage detection function for the chemical industry to solve the above problems. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] In view of the problems existing in the prior art, the purpose of the utility model is to provide a straight pipe pressure-balanced expansion joint for the chemical industry, which can be equipped with a rubber flexible deformable outer cylinder that can cooperate with elastic displacement outside the expansion joint body. The gas sensor in the rubber flexible deformable outer cylinder can detect whether there is a risk of leakage in a ring around the outer circumference of the expansion joint body, which is beneficial to ensure the safety of the expansion joint body and the chemical pipeline connected to it during operation.

[0006] Technical Solution

[0007] To solve the above problems, the utility model adopts the following technical solutions.

[0008] The straight pipe pressure-balanced expansion joint of the chemical industry comprises an expansion joint body, the upper and lower ends of the expansion joint body are fixedly connected with connecting discs, the ends of the two connecting discs close to each other are installed with inner connecting discs, a rubber flexible deformable outer cylinder is fixedly connected between the two inner connecting discs, an electric annular guide is fixedly connected to the upper side of the inner connecting disc at the lower end, a sliding block is fixedly connected to the output end of the electric annular guide, an upper sliding transverse groove block is slidably connected to the lower end of the inner connecting disc, a flexible guide wire column is fixedly connected between the upper sliding transverse groove block and the sliding block, an electric winder is fixedly connected to the upper inner wall of the upper sliding transverse groove block, a displacement rope is wound around the outer end of the electric winder, and a gas sensor is connected to the lower end of the displacement rope.

[0009] Furthermore, the rubber flexible deformable outer cylinder is located outside the expansion joint body, and the outer end of the expansion joint body is fixedly connected with the bellows body.

[0010] Furthermore, a semi-arc pull ring is fixedly connected to the upper end of the gas sensor, and the displacement rope is connected to the semi-arc pull ring.

[0011] Furthermore, an arc-shaped slip ring is fixedly connected to one end of the gas sensor close to the flexible guide wire column.

[0012] Furthermore, the arc-shaped slip ring slides outside the flexible guide wire column, and the inner end of the rubber flexible deformable outer cylinder is fixedly connected with the heat-insulating inner layer.

[0013] Furthermore, the outer end triangles of the connecting disc are all fixedly connected with connecting transverse blocks, and the inner ends of the connecting transverse blocks are provided with threaded connecting holes.

[0014] Furthermore, a limit vertical rod is threadedly connected between two corresponding upper and lower threaded connection holes. Beneficial Effects

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] (1) During the use of the expansion joint body of this scheme, a rubber flexible deformable outer cylinder that can cooperate with elastic displacement is arranged outside the expansion joint body. The gas sensor in the rubber flexible deformable outer cylinder can detect whether there is a risk of leakage in a ring around the outer circumference of the expansion joint body. The gas sensor performs a full range of detection functions on the outer side of the expansion joint body, which is beneficial to ensure the safety of the expansion joint body and the chemical pipeline connected to it during operation.

[0017] (2) At the same time, the inner end of the rubber flexible deformable outer tube is fixedly connected with an insulating inner layer, which can provide insulation and protection for the expansion joint body, prevent external foreign matter and low temperature environment from having adverse effects on the service life of the expansion joint body, and further ensure the use efficiency of the expansion joint body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the axial side structure of the expansion joint body of the utility model;

[0019] Figure 2 This is a schematic diagram of the side cross-sectional structure of the rubber flexible deformable outer cylinder shaft of the utility model;

[0020] Figure 3 This is a schematic diagram of the front view structure of the sliding block of the utility model;

[0021] Figure 4 It is a schematic diagram of the side cross-sectional structure of the rubber flexible deformable outer cylinder of the utility model.

[0022] Description of the numbers in the figure:

[0023] 1. Connecting disc; 2. Expansion joint body; 3. Bellows body; 4. Electric annular guide rail; 5. Connecting cross block; 6. Threaded connecting hole; 7. Inner connecting disc; 8. Rubber flexible deformable outer cylinder; 9. Sliding block; 10. Arc slip ring; 11. Flexible guide wire column; 12. Gas sensor; 13. Semi-arc pull ring; 14. Displacement rope; 15. Electric winder; 16. Upper sliding cross groove block; 17. Insulating inner layer. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] Example:

[0028] See also Figure 1-3, a straight pipe pressure-balanced expansion joint for the chemical industry, comprising an expansion joint body 2, wherein the upper and lower ends of the expansion joint body 2 are fixedly connected with connecting discs 1, and the ends of the two connecting discs 1 close to each other are installed with inner connecting discs 7, and a rubber flexible deformable outer cylinder 8 is fixedly connected between the two inner connecting discs 7, and an electric annular guide rail 4 is fixedly connected to the upper side of the inner connecting disc 7 located at the lower end, and a sliding block 9 is fixedly connected to the output end of the electric annular guide rail 4, and an upper sliding transverse groove block 16 is slidably connected to the lower end of the inner connecting disc 7, and a flexible guide wire column 11 is fixedly connected between the upper sliding transverse groove block 16 and the sliding block 9, and an electric winder 15 is fixedly connected to the upper inner wall of the upper sliding transverse groove block 16, and a displacement rope 14 is wound around the outer end of the electric winder 15, and a gas sensor 12 is connected to the lower end of the displacement rope 14.

[0029] See also Figure 2-3 The rubber flexible deformable outer cylinder 8 is located outside the expansion joint body 2, the outer end of the expansion joint body 2 is fixedly connected to the bellows body 3, the upper end of the gas sensor 12 is fixedly connected to a semi-arc pull ring 13, the displacement rope 14 is connected to the semi-arc pull ring 13, the end of the gas sensor 12 close to the flexible guide wire column 11 is fixedly connected to an arc slip ring 10, the arc slip ring 10 slides outside the flexible guide wire column 11, the outer end triangle of the connecting disc 1 is fixedly connected to a connecting cross block 5, the inner end of the connecting cross block 5 is provided with a threaded connecting hole 6, and a limit vertical rod is threadedly connected between the two corresponding threaded connecting holes 6 above and below.

[0030] See also Figure 2 , 4 The inner end of the rubber flexible deformable outer tube 8 is fixedly connected with an insulating inner layer 17. At the same time, the inner end of the rubber flexible deformable outer tube 8 is fixedly connected with an insulating inner layer 17. The insulating inner layer 17 can provide insulation and protection for the expansion joint body 2, avoiding external foreign matter and low temperature environment from having adverse effects on the service life of the expansion joint body 2, and further ensuring the use efficiency of the expansion joint body 2.

[0031] See also Figure 1-3During the use of the expansion joint body 2, a rubber flexible deformable outer cylinder 8 that can cooperate with elastic displacement is arranged outside the expansion joint body 2. The gas sensor 12 in the rubber flexible deformable outer cylinder 8 can detect whether there is a risk of leakage in an annular circle around the expansion joint body 2, which is beneficial to ensure the safety of the expansion joint body 2 and the chemical pipeline connected to it during operation. The displacement method of the gas sensor 12 is to use the electric winding device 15 to move the rope 14 to move the gas sensor 12 up and down, and the gas sensor 12 is connected to the flexible guide wire column 11 when it moves up and down. The flexible guide wire column 11 provides a vertical limit function for the up and down displacement of the gas sensor 12, so that its displacement direction is vertically stable. The up and down displaced gas sensor 12 can be displaced in annular shape in the electric annular guide rail 4 according to the sliding block 9, so that the gas sensor 12 can perform a full-range detection function on the outer position of the expansion joint body 2.

[0032] The above is only a preferred specific implementation of the utility model; however, the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and improved ideas of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model.

Claims

1. A straight pipe pressure-balanced expansion joint for the chemical industry, comprising an expansion joint body (2), characterized in that: The upper and lower ends of the expansion joint body (2) are fixedly connected with connecting discs (1), and the ends of the two connecting discs (1) that are close to each other are installed with inner connecting discs (7). A rubber flexible deformable outer cylinder (8) is fixedly connected between the two inner connecting discs (7). The upper side of the inner connecting disc (7) located at the lower end is fixedly connected with an electric annular guide rail (4), and the output end of the electric annular guide rail (4) is fixedly connected with a sliding block (9). The lower end of the inner connecting disc (7) is slidably connected with an upper sliding transverse groove block (16), and a flexible guide wire column (11) is fixedly connected between the upper sliding transverse groove block (16) and the sliding block (9). The upper inner wall of the upper sliding transverse groove block (16) is fixedly connected with an electric winder (15), and a displacement rope (14) is wound around the outer end of the electric winder (15). The lower end of the displacement rope (14) is connected to a gas sensor (12).

2. The straight pipe pressure balanced expansion joint for the chemical industry according to claim 1, characterized in that: The rubber flexible deformable outer cylinder (8) is located outside the expansion joint body (2), and the outer end of the expansion joint body (2) is fixedly connected to a bellows body (3).

3. The straight pipe pressure balanced expansion joint for the chemical industry according to claim 1, characterized in that: A semi-arc-shaped pull ring (13) is fixedly connected to the upper end of the gas sensor (12), and the displacement rope (14) is connected to the semi-arc-shaped pull ring (13).

4. The straight pipe pressure balanced expansion joint for the chemical industry according to claim 1, characterized in that: An arc-shaped slip ring (10) is fixedly connected to one end of the gas sensor (12) close to the flexible guide wire column (11).

5. The straight pipe pressure balanced expansion joint for the chemical industry according to claim 4, characterized in that: The arc-shaped slip ring (10) slides outside the flexible guide wire column (11), and the inner end of the rubber flexible deformable outer cylinder (8) is fixedly connected to a heat-insulating inner layer (17).

6. The straight pipe pressure balanced expansion joint for the chemical industry according to claim 1, characterized in that: The outer triangles of the connecting disc (1) are all fixedly connected to connecting transverse blocks (5), and the inner ends of the connecting transverse blocks (5) are provided with threaded connecting holes (6).

7. The straight pipe pressure balanced expansion joint for the chemical industry according to claim 6, characterized in that: A limit vertical rod is threadedly connected between the two corresponding threaded connection holes (6) at the top and the bottom.

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