Anti-clogging type axial expansion joint

Abstract

An anti-clogging axial expansion joint includes a bellows, flanges, limiting components, a drain component, a slag separator, and a sealing component. Flanges are provided at both ends of the bellows. Multiple limiting components, including tie rods and fixing plates, are disposed between the outer circumferential walls of the two flanges. The fixing plates are disposed on the outer circumferential walls of the flanges and have holes thereon. External threads are provided at both ends of the tie rod's outer wall, and both ends of the tie rod pass through the holes in the fixing plates on both sides, with nuts at the ends of the tie rods. The drain component is disposed on the flanges. The slag separator is disposed between the bottom inner walls of the two flanges. The sealing component is disposed on the outer wall of the slag separator. This invention effectively prevents scale buildup on the bellows, ensuring the normal operation of the expansion joint.

Description

Technical Field

[0001] This utility model relates to an expansion joint, and more particularly to an expansion joint that can prevent clogging when passing through the blast furnace slag flushing circulating water, belonging to the technical field of expansion joint equipment. Background Technology

[0002] Water quenching of blast furnace slag is currently the main method for treating blast furnace slag in my country; the recycling of a large amount of blast furnace slag flushing wastewater can save on fresh water replenishment and reduce the discharge of blast furnace wastewater. To minimize environmental pollution from wastewater discharge; in actual production, the temperature of the slag flushing circulating water fluctuates between 65℃ and 80℃ due to factors such as ambient temperature, slag temperature, and the amount of replenishment water; to absorb the thermal displacement of the pipeline caused by temperature changes and reduce pump vibration, an axial expansion joint is installed at the pump outlet; currently, it has been found that the weld joints of the pump base fixing brackets for the pipes with expansion joints crack, seriously affecting the normal operation of the slag flushing water system; after the accident, a comprehensive inspection of the expansion joint revealed a large amount of white precipitate scale clogging the space between the expansion joint guide tube and the corrugations, as well as inside the corrugations. When the pipeline temperature rises, the corrugated elements of the expansion joint cannot compress, causing the pump base fixing brackets for the pipes with expansion joints to be subjected to excessive stress and cracking; the presence of white precipitate scale prevents the corrugations from effectively expanding and contracting, leading to expansion joint failure; therefore, an axial expansion joint that can prevent the deposition of white precipitate scale on the inner wall is needed to ensure the smooth operation of production. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an anti-clogging axial expansion joint that can effectively prevent white precipitate scale from settling in the corrugated section of the expansion joint.

[0004] The problem described in this utility model is solved by the following technical solution:

[0005] An anti-clogging axial expansion joint includes a bellows, flanges, limiting components, a drain component, a slag-separating component, and a sealing component. Flanges are provided at both ends of the bellows. Multiple limiting components, including tie rods and fixing plates, are disposed between the outer circumferential walls of the two flanges. The fixing plates are disposed on the outer circumferential walls of the flanges and have holes thereon. External threads are provided at both ends of the tie rod's outer wall, and both ends of the tie rod pass through the holes in the fixing plates on both sides, with nuts provided at the ends of the tie rods. The drain component is disposed on the flanges. The slag-separating component is disposed between the bottom inner walls of the two flanges. The sealing component is disposed on the outer wall of the slag-separating component.

[0006] The aforementioned anti-clogging axial expansion joint includes a first slag-blocking cylinder, a second slag-blocking cylinder, and a rubber compensation gasket. The first slag-blocking cylinder is disposed on the inner wall of a first flange, and the second slag-blocking cylinder is disposed on the inner wall of a second flange, with the center lines of the first slag-blocking cylinder, the second slag-blocking cylinder, and the flange coinciding. The inner diameters of the first slag-blocking cylinder, the second slag-blocking cylinder, and the flange are identical. The rubber compensation gasket is disposed within the gap between the first slag-blocking cylinder and the second slag-blocking cylinder.

[0007] The aforementioned anti-clogging axial expansion joint includes a sealing element comprising a first sleeve, a V-shaped sealing ring, a sealing ring, and a second sleeve. One end of the first sleeve is fitted onto the outer wall of the first slag-separating cylinder, and the inner wall of the first sleeve is welded to the outer wall of the first slag-separating cylinder at its contact point. The other end of the first sleeve is fitted onto the outer wall of the second slag-separating cylinder, and the inner wall of the first sleeve contacts but is not fixed to the outer wall of the second slag-separating cylinder. The outer wall of the rubber compensation pad presses against the inner wall of the first sleeve. The sealing ring is welded to the outer wall of the second slag-separating cylinder. A second sealing ring is provided at the outermost edge of the end face of the sealing ring near the first sleeve. The first sleeve has an inner wall that contacts but is not fixed to the outer wall of the second sleeve, and the inner diameter of the second sleeve is equal to the outer diameter of the first sleeve. The first sleeve, the second sleeve, and the sealing ring form a closed annular cavity, which is filled with flexible graphite filler. The side wall of the second sleeve has a filler hole, and a sealing bolt is installed at the filler hole. A V-shaped sealing ring is installed at the end of the first sleeve near the sealing ring, and a V-shaped sealing ring is installed at the end of the sealing ring near the first sleeve. Both V-shaped sealing rings are located in the closed annular cavity, and the flexible graphite filler is located between the two V-shaped sealing rings.

[0008] The aforementioned anti-clogging axial expansion joint includes a threaded sealing plug as the drain component; the flange has an internal channel, one end of which is connected to a threaded hole on the circumferential sidewall of the flange, and the cavity between the first slag-separating cylinder and the bellows is connected to the other end of the channel.

[0009] This invention initially blocks the contact between water flow and the corrugated pipe through a slag separator; further seals the water by using a sealing component; and discharges any small amount of water that has seeped into the corrugated pipe through a drain component. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0011] Figure 2 This is a cross-sectional three-dimensional structural diagram of the present invention;

[0012] Figure 3 This is a partially enlarged structural diagram of component A of this utility model.

[0013] The list of labels in the diagram is as follows: 1. Bellows, 2. Flange, 3. Limiting component, 4. Drainage component, 5. First slag-separating cylinder, 6. Second slag-separating cylinder, 7. Rubber compensation gasket, 8. First sleeve, 9. V-ring seal, 10. Sealing ring, 11. Second sleeve. Detailed Implementation

[0014] See Figure 1 , 2 and Figure 3 This utility model includes a bellows 1, a flange 2, a limiting component 3, a drain component 4, a slag separator, and a sealing component; both ends of the bellows 1 are provided with flanges 2; multiple limiting components 3 are provided between the outer circumferential walls of the two flanges 2, and the function of the limiting components 3 is to physically prevent the expansion joint from being over-compressed, over-stretched, or from laterally shifting beyond the design range; the flanges 2 on both sides are respectively connected to the corresponding flanges.

[0015] The limiting component 3 includes a pull rod and a fixing plate; the fixing plate is set on the outer circumference of the flange 2 and has a hole thereon; the two ends of the outer wall of the pull rod are provided with external threads, and the two ends of the pull rod pass through the holes of the fixing plates on both sides respectively, and the end of the pull rod is provided with a nut; the drain component 4 is set on the flange 2; the function of the drain component is to drain the accumulated water if some water enters between the slag separator and the bellows; the slag separator is set between the bottom ends of the inner walls of the two flanges 2; the slag separator blocks water, and the sealing component provides further sealing; the sealing component is set on the outer wall of the slag separator.

[0016] The slag-separating component includes a first slag-separating cylinder 5, a second slag-separating cylinder 6, and a rubber compensating gasket 7. The first slag-separating cylinder 5 is disposed on the inner wall of the first flange 2, and the second slag-separating cylinder 6 is disposed on the inner wall of the second flange 2, with the center lines of the first slag-separating cylinder 5, the second slag-separating cylinder 6, and the flange 2 coinciding. The inner diameters of the first slag-separating cylinder 5, the second slag-separating cylinder 6, and the flange 2 are identical. This consistency in inner diameters ensures rapid water flow and prevents scale buildup due to unevenness. Due to the expansion and contraction of the bellows 1, relative displacement may occur between the first slag-separating cylinder 5 and the second slag-separating cylinder 6. When displacement occurs between the first slag-separating cylinder 5 and the second slag-separating cylinder 6, the elastic deformation of the rubber compensating gasket 7 can effectively seal the gap between the first slag-separating cylinder 5 and the second slag-separating cylinder 6. The rubber compensating gasket 7 is disposed within the gap between the first slag-separating cylinder 5 and the second slag-separating cylinder 6.

[0017] The sealing element includes a first sleeve 8, a V-shaped sealing ring 9, a sealing ring 10, and a second sleeve 11. One end of the first sleeve 8 is fitted onto the outer wall of the first slag-separating cylinder 5, and the inner wall of the first sleeve 8 is welded to the outer wall of the first slag-separating cylinder 5. The other end of the first sleeve 8 is fitted onto the outer wall of the second slag-separating cylinder 6, and the inner wall of the first sleeve 8 contacts but is not fixed to the outer wall of the second slag-separating cylinder 6. Since relative movement will occur between the two slag-separating cylinders, the first sleeve 8 fixed to the first slag-separating cylinder 5 and... Relative displacement occurs between the second slag-separating cylinders 6; the outer wall of the rubber compensation pad 7 presses against the inner wall of the first sleeve 8; the sealing ring 10 is welded to the outer wall of the second slag-separating cylinder 6; a second sleeve 11 is provided at the outermost edge of the end face of the sealing ring 10 near the first sleeve 8, and the inner wall of the second sleeve 11 contacts but is not fixed to the outer wall of the first sleeve 8, and the inner diameter of the second sleeve 11 is equal to the outer diameter of the first sleeve 8; the first sleeve 8, the second sleeve 11 and the sealing ring 10 form a closed annular cavity. The annular cavity is filled with flexible graphite packing. Due to the relative displacement between the first sleeve 8 and the second sleeve 11, the space of the closed annular cavity is also dynamically changing. The flexible graphite packing has good compression and resilience properties. Its particles contain closed and semi-closed micropores, which will produce elastic and plastic deformation when subjected to pressure. This deformation is conducive to the tight fit between the sealing part and the surface of the mating part, and can compensate for the roughness of the surface, resulting in excellent sealing effect. The rubber compensation pad 7 is the first layer of sealing for the water flow, and the flexible graphite packing is the second layer of sealing. The side wall of the second sleeve 11 is provided with packing holes, and sealing bolts are provided at the packing holes. After the flexible graphite packing is filled, the sealing bolts are tightened. A V-shaped sealing ring 9 is provided at the end of the first sleeve 8 near the sealing ring 10, and a V-shaped sealing ring 9 is provided at the end of the sealing ring 10 near the first sleeve 8. Both V-shaped sealing rings 9 are located in the closed annular cavity, and the flexible graphite packing is located between the two V-shaped sealing rings 9. The V-shaped sealing rings 9 provide further sealing.

[0018] The drain component 4 includes a threaded sealing plug; the flange 2 has an internal channel, one end of which connects to a threaded hole on the circumferential side wall of the flange 2, and the cavity between the first slag-separating cylinder 5 and the bellows 1 is connected to the other end of the channel; during installation, it is necessary to ensure that the drain component 4 is at the bottom in the vertical direction to facilitate draining; during monthly inspections, the threaded sealing plug should be unscrewed to check for water accumulation inside the bellows of the expansion joint; if water is found inside the bellows, it indicates that the sleeve expansion joint is leaking, and the frequency of inspections should be increased and draining should be carried out in a timely manner.

Claims

1. A plug preventing expansion joint of the axial type, characterized in that: The system includes a bellows (1), a flange (2), a limiting component (3), a drain component (4), a slag separator, and a sealing component; both ends of the bellows (1) are provided with flanges (2); multiple limiting components (3) are provided between the outer circumferential walls of the two flanges (2), and the limiting component (3) includes a pull rod and a fixing plate; the fixing plate is provided on the outer circumferential wall of the flange (2) and has a hole thereon; both ends of the outer wall of the pull rod are provided with external threads, and both ends of the pull rod pass through the holes of the fixing plates on both sides, and the end of the pull rod is provided with a nut; the drain component (4) is provided on the flange (2); the slag separator is provided between the bottom ends of the inner walls of the two flanges (2); and the sealing component is provided on the outer wall of the slag separator.

2. The anti-clogging axial expansion joint of claim 1, wherein: The slag-separating component includes a first slag-separating cylinder (5), a second slag-separating cylinder (6), and a rubber compensation pad (7); the first slag-separating cylinder (5) is disposed on the inner wall of the first flange (2), the second slag-separating cylinder (6) is disposed on the inner wall of the second flange (2), and the center lines of the first slag-separating cylinder (5), the second slag-separating cylinder (6), and the flange (2) coincide; the inner diameters of the first slag-separating cylinder (5), the second slag-separating cylinder (6), and the flange (2) are the same; the rubber compensation pad (7) is disposed in the gap between the first slag-separating cylinder (5) and the second slag-separating cylinder (6).

3. The anti-clogging axial expansion joint of claim 2, wherein: The sealing components include a first sleeve (8), a V-shaped sealing ring (9), a sealing ring (10), and a second sleeve (11). One end of the first sleeve (8) is fitted onto the outer wall of the first slag-separating cylinder (5), and the inner wall of the first sleeve (8) is welded to the outer wall of the first slag-separating cylinder (5). The other end of the first sleeve (8) is fitted onto the outer wall of the second slag-separating cylinder (6), and the inner wall of the first sleeve (8) is in contact with but not fixed to the outer wall of the second slag-separating cylinder (6). The outer wall of the rubber compensation pad (7) presses against the inner wall of the first sleeve (8). The sealing ring (10) is welded onto the outer wall of the second slag-separating cylinder (6). The second sleeve (11) is located at the outermost edge of the end face of the sealing ring (10) near the first sleeve (8). The inner wall of the second sleeve (11) is in contact with but not fixed to the outer wall of the first sleeve (8). The inner diameter of the second sleeve (11) is equal to the outer diameter of the first sleeve (8). The first sleeve (8), the second sleeve (11) and the sealing ring (10) form a closed annular cavity, which is filled with flexible graphite filler. The side wall of the second sleeve (11) is provided with a filler hole, and a sealing bolt is provided at the filler hole. A V-shaped sealing ring (9) is provided at one end of the first sleeve (8) near the sealing ring (10), and a V-shaped sealing ring (9) is provided at one end of the sealing ring (10) near the first sleeve (8). Both V-shaped sealing rings (9) are located in the closed annular cavity, and the flexible graphite filler is located between the two V-shaped sealing rings (9).

4. The anti-clogging axial expansion joint of claim 3, wherein: The sewage discharge component (4) includes a threaded sealing plug; the flange (2) has a channel inside, and one end of the channel is connected to the threaded hole on the circumferential side wall of the flange (2), and the cavity between the first slag-blocking cylinder (5) and the bellows (1) is connected to the other end of the channel.

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