Novel telescopic coupling device for coal dust exhaust pipeline

Abstract

The utility model relates to a novel connecting device technical field of pipeline, specifically relates to a novel telescopic connecting device of pulverized coal waste gas pipeline, including cylinder, the tail end of cylinder is connected with sleeve cover and is connected, sleeve cover is fixedly connected with connecting flange, the front end of sleeve cover is equipped with annular groove, and is equipped with positioning hole at the tail end, connecting flange is fixedly connected with positioning hole through connecting bolt, and is filled with filler in the inside of positioning hole, the tail end of cylinder is fixedly connected with annular groove, and positioning hole is equidistant array distribution, the filler is the cavity structure of no face at the front end, and the inside of filler and the bottom end of connecting bolt are in interference contact, and are combined through flange bolt, the flange side of combination has pipeline flange combination together, fills up in the filler box with 20mm's graphite filler, and the outer end of filler box is pressed with bolt and is pressed tightly, makes graphite filler in the filler box and the outer surface of original pipeline closely adhere, effectively prevents gas leakage, avoids the pollution of pulverized coal waste gas leakage to environment and the threat to production safety.

Description

Technical Field

[0001] This utility model relates to the technical field of novel pipeline connection devices, specifically to a novel telescopic connection device for pulverized coal exhaust gas pipelines. Background Technology

[0002] In industrial production, especially in scenarios involving pulverized coal, such as power plants and cement plants, the stable operation of pulverized coal exhaust gas pipelines is crucial. Traditional pulverized coal exhaust gas pipeline connection devices have many drawbacks. On the one hand, common compensators cannot dynamically adjust the direction of deformation compensation when dealing with the thermal expansion and contraction of the pipeline. The main function of pulverized coal exhaust gas from blast furnace hot blast stoves is to dry the raw coal in pulverized coal mills. The distance from the blast furnace hot blast stove to the pulverized coal area is relatively long. The pipeline used has a diameter of DN1200mm. When entering the pulverized coal area, the pipeline has expansion joints or other compensation structures. When attempting to make the compensator easy to bend and compensate under a small directional torsional force, it causes it to become easy to bend in other directions as well, greatly reducing its stability and making it susceptible to shaking due to external forces such as strong winds. On the other hand, for applications like packing compensators in power plant boiler pulverized coal pipelines, pulverized coal leakage problems often occur. Furthermore, with temperature changes, the packing will age, thus restricting pipeline displacement, hindering the smooth expansion of the pipeline system, and seriously affecting the normal operation of the entire pipeline system.

[0003] The existing design of the telescopic flame-retardant fireproof cloth for pipelines has a high temperature resistance of <200 degrees Celsius. However, the performance of the flame-retardant fireproof cloth deteriorates after a period of use, causing exhaust gas leakage. This results in excessive coal gas levels in the coal powder operation area, posing a significant safety hazard. Furthermore, the amount of exhaust gas used after the leakage is insufficient, affecting the coal powder production. Utility Model Content

[0004] Technical problems to be solved In view of the above-mentioned shortcomings of the existing technology, this utility model provides a novel telescopic connection device for pulverized coal exhaust gas pipeline, which can effectively solve the problems in the existing technology.

[0005] Technical solution This utility model provides a novel telescopic connection device for pulverized coal exhaust gas pipelines, including a cylinder, the tail end of which is sleeved and connected to a sleeve, the sleeve being fixedly connected to a connecting flange, the front end of which has an annular groove and the rear end has a positioning hole, the connecting flange being fixedly connected to the positioning hole by connecting bolts, and the positioning hole being filled with filler.

[0006] Furthermore, the tail end of the cylinder is fixedly connected to the annular groove, and the positioning holes are distributed in an equidistant array.

[0007] Furthermore, the packing material has a cavity structure with no front end, and the interior of the packing material is in interference contact with the bottom end of the connecting bolt.

[0008] Furthermore, the height of the packing is 20mm, the bottom thickness of the packing is 10mm, and it is made of graphite.

[0009] Beneficial effects In this invention, the packing and connecting bolts (sleeve-connecting flange) serve as a shrink-fit connection device, achieving excellent sealing through a unique structural design. A positioning hole is opened at the rear end of the sleeve, and the connecting flange is fixedly connected to the positioning hole via connecting bolts. The positioning hole is filled with graphite packing material with a height of 20mm and a bottom thickness of 10mm. This packing material has a hollow structure with no front face, and its interior makes interference contact with the bottom end of the connecting bolt, tightly filling the gap in the positioning hole. During installation, the two halves are assembled and secured with flange bolts. After assembly, one flange side is joined to the pipe flange, while the other side is filled with 20mm of graphite packing in the packing box. The outer flange of the packing box is then tightened with bolts, ensuring a tight fit between the graphite packing inside the packing box and the original outer surface of the pipe. This effectively prevents gas leakage, avoiding environmental pollution and threats to production safety caused by pulverized coal exhaust gas leakage.

[0010] In this device, the tail end of the cylinder is connected to the sleeve, and the tail end of the cylinder is fixedly connected to the annular groove at the front end of the sleeve, allowing the pipeline to expand and contract freely within a certain range. When the pipeline expands and contracts due to factors such as temperature changes, this device can flexibly adapt to this length change, avoiding stress concentration caused by restricted pipeline expansion and contraction, thereby effectively preventing pipeline rupture or damage.

[0011] Finally, a cylinder with a diameter of 1220mm and a length of 300mm was constructed using 6mm thick steel plates, ensuring the device has sufficient strength and stability to withstand the pressure of pulverized coal exhaust gas and the forces exerted by the external environment. Meanwhile, graphite was selected as the packing material. Graphite possesses excellent high-temperature resistance, wear resistance, and self-lubricating properties, ensuring long-term stable operation in the high-temperature pulverized coal exhaust gas environment and reducing wear caused by friction to a certain extent, thus extending the service life of the device. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the structure of this utility model; Figure 3This is a cross-sectional front view of the present invention; Figure 4 This is a cross-sectional view of the present invention. Figure 5 This is a structural exploded view of the packing and sleeve in this utility model.

[0014] The labels in the diagram represent: 1. cylinder; 2. sleeve; 21. annular groove; 22. positioning hole; 3. connecting flange; 4. packing; 5. connecting bolt. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0016] The present invention will be further described below with reference to the embodiments.

[0017] Example: A novel expansion joint device for pulverized coal exhaust gas pipelines, see attached diagram. Figure 1 - Appendix Figure 5 The system includes a cylinder 1, the tail end of which is fitted and connected to a sleeve 2. The sleeve 2 is fixedly connected to a connecting flange 3. The sleeve 2 has an annular groove 21 at its front end and a positioning hole 22 at its rear end. The connecting flange 3 is fixedly connected to the positioning hole 22 by connecting bolts 5, and the positioning hole 22 is filled with filler 4. The filler 4 and connecting bolts 5 (sleeve 2 - connecting flange 3) act as a shrink-fit connection device, achieving a good sealing effect through a unique structural design. The positioning hole 22 is located at the rear end of the sleeve 2, and the connecting flange 3 is fixedly connected to the positioning hole 22 by connecting bolts 5. The positioning hole 22 is filled with graphite filler 4 with a height of 20mm and a bottom thickness of 10mm. This filler 4 has a hollow structure with no front end, and its interior makes interference contact with the bottom end of the connecting bolt 5, tightly filling the gap in the positioning hole 22. During installation, the two halves are assembled and fastened together with flange bolts. After assembly, the flange side is joined to the pipe flange, and the other side is filled with 20mm graphite packing 4 in the stuffing box. The outer flange of the stuffing box is then tightened with bolts, so that the graphite packing 4 in the stuffing box fits tightly against the outer surface of the original pipe, effectively preventing gas leakage.

[0018] The tail end of cylinder 1 is fixedly connected to an annular groove 21, and positioning holes 22 are evenly distributed in an array. Cylinder 1, with a diameter of 1220mm and a length of 300mm, is made of 6mm thick steel plate, ensuring sufficient strength and stability to withstand the pressure of pulverized coal exhaust gas and the forces of the external environment. Meanwhile, graphite is selected to make the packing 4. Graphite has excellent high-temperature resistance, wear resistance, and self-lubricating properties, ensuring long-term stable operation in the high-temperature pulverized coal exhaust gas environment and reducing wear caused by friction to a certain extent, thus extending the service life of the device.

[0019] The packing 4 is a hollow structure without a front end, and its interior is in interference contact with the bottom end of the connecting bolt 5. The packing 4 has a height of 20mm, with a bottom thickness of 10mm, and is made of graphite. In this device, the tail end of the cylinder 1 is fitted and connected to the sleeve 2, and the tail end of the cylinder 1 is fixedly connected to the annular groove 21 at the front end of the sleeve 2, allowing the pipeline to expand and contract freely within a certain range. When the pipeline expands and contracts due to temperature changes or other factors, this device can flexibly adapt to this length change, avoiding stress concentration caused by restricted pipeline expansion and contraction, thereby effectively preventing pipeline rupture or damage.

[0020] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A novel telescopic connection device for pulverized coal exhaust gas pipelines, characterized in that, The cylinder (1) is fitted with a sleeve (2) at its tail end. The sleeve (2) is fixedly connected to a connecting flange (3). The sleeve (2) has an annular groove (21) at its front end and a positioning hole (22) at its rear end. The connecting flange (3) is fixedly connected to the positioning hole (22) by connecting bolts (5), and the positioning hole (22) is filled with filler (4).

2. The novel telescopic connection device for pulverized coal waste gas pipelines according to claim 1, characterized in that, The tail end of the cylinder (1) is fixedly connected to the annular groove (21), and the positioning holes (22) are distributed in an equidistant array.

3. The novel telescopic connection device for pulverized coal waste gas pipeline according to claim 1, characterized in that, The filler (4) is a cavity structure with no front end, and the interior of the filler (4) is in interference contact with the bottom end of the connecting bolt (5).

4. The novel telescopic connection device for pulverized coal waste gas pipelines according to claim 1, characterized in that, The height of the filler (4) is 20 mm, the bottom thickness of the filler (4) is 10 mm, and it is made of graphite.

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