Pipe fitting for composite steel pipe connection

Abstract

The utility model relates to a pipe fitting for composite steel pipe connection, including two connecting mechanisms, two connecting mechanisms are connected through bolt, the connecting mechanism includes casing, guide cylinder and fixed ring, the casing is cylindrical, the guide cylinder sets up in casing, the guide cylinder is arranged coaxially with casing, one end of casing is equipped with the bending part, the bending part one end of casing is connected with casing, the other end of bending part of casing is connected with the end of guide cylinder, this pipe fitting for composite steel pipe connection, through the casing of two casing is equipped in the end of two composite steel pipes needing to be connected, then through the fixed ring is driven into in the guide cylinder, make the extrusion of guide cylinder outward, realize the sealed connection with the end of steel pipe, then through bolt sealed connection two casing, realize the sealed connection of two composite steel pipes, not only connect firm, leakproofness is good, and will not damage the lining, and the installation is also more convenient.

Description

Technical Field

[0001] This utility model relates to a pipe fitting for connecting composite steel pipes. Background Technology

[0002] Composite steel pipes, usually referring to plastic-lined composite steel pipes or plastic-coated composite steel pipes, differ from ordinary steel pipes. The core points of composite steel pipe connections are: protecting the inner lining layer to prevent it from being damaged in high-temperature flexible or mechanical connections, while ensuring that the corrosion resistance of the connection is consistent with that of the pipe body.

[0003] In existing technologies, threaded connections are often used to connect two pipes. The advantages are low cost and relatively simple installation. However, the inner lining is easily damaged. The heat and mechanical force generated during the threading process may cause the inner plastic lining to deform, tear, or peel off from the steel pipe, resulting in relatively poor sealing. Utility Model Content

[0004] This utility model provides a pipe fitting for connecting composite steel pipes.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a pipe fitting for connecting composite steel pipes, including two connecting mechanisms, which are connected by bolts;

[0006] The connecting mechanism includes a housing, a guide cylinder, and a fixing ring. The housing is cylindrical, and the guide cylinder is disposed inside the housing and coaxially arranged with the housing. One end of the housing has a bent portion, one end of which is connected to the housing, and the other end of which is connected to the end of the guide cylinder. There is a gap between the guide cylinder and the housing, and a washer is provided between the housing and the guide cylinder. One side of the washer fits against one side of the bent portion of the housing. The inner diameter of the guide cylinder gradually decreases from the end near the bent portion of the housing to the end away from the bent portion of the housing. The fixing ring is disposed inside the guide cylinder and coaxially arranged with the guide cylinder.

[0007] The outer circumference of the fixed ring is evenly provided with six sliders, and the inner wall of the guide cylinder is provided with six grooves corresponding to the positions of the six sliders. The six sliders are evenly arranged around the axis of the guide cylinder, and the sliders and grooves correspond one-to-one. The sliders and grooves are slidably connected.

[0008] The outer diameter of the fixing ring is smaller than the maximum inner diameter of the guide cylinder, and the outer diameter of the fixing ring is larger than the minimum inner diameter of the guide cylinder.

[0009] Preferably, the outer side of the casing near the bending part is provided with a plurality of connecting blocks evenly arranged in a circumferential direction, the connecting blocks of the two connecting mechanisms are arranged in a one-to-one correspondence, and the corresponding two connecting blocks of the two connecting mechanisms are connected by bolts.

[0010] Preferably, a sealing ring is provided between the housings of the two connecting mechanisms.

[0011] The beneficial effects of this utility model are that the pipe fitting for connecting composite steel pipes is achieved by fitting two sleeves onto the ends of the two composite steel pipes to be connected, and then by inserting a fixing ring into the guide cylinder, causing the guide cylinder to be squeezed outward, thus achieving a sealed connection with the ends of the steel pipes. Finally, the two sleeves are sealed together with bolts to achieve a sealed connection between the two composite steel pipes. This not only ensures a firm connection and good sealing performance, but also does not damage the inner lining and is relatively easy to install. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a structural schematic diagram of the pipe fitting for connecting composite steel pipes according to this utility model.

[0014] Figure 2 This is a schematic diagram of the structure of the guide cylinder of the pipe fitting for connecting composite steel pipes according to this utility model;

[0015] Figure 3 This is a structural schematic diagram of the fixing ring of the pipe fitting used for connecting composite steel pipes according to this utility model.

[0016] In the diagram: 1. Housing, 2. Bending section, 3. Guide cylinder, 4. Washer, 5. Fixing ring, 6. Connecting block, 7. Bolt, 8. Slider, 9. Sealing ring. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0018] like Figure 1-3 As shown, a pipe fitting for connecting composite steel pipes includes two connecting mechanisms connected by bolts 7.

[0019] The connecting mechanism includes a housing 1, a guide cylinder 3, and a fixing ring 5. The housing 1 is cylindrical, and the guide cylinder 3 is disposed inside the housing 1 and is coaxially arranged with the housing 1. One end of the housing 1 is provided with a bent portion 2, one end of which is connected to the housing 1, and the other end of which is connected to the end of the guide cylinder 3. There is a gap between the guide cylinder 3 and the housing 1. A washer 4 is provided between the housing 1 and the guide cylinder 3, and one side of the washer 4 is fitted with one side of the bent portion 2 of the housing 1. The inner diameter of the guide cylinder 3 gradually decreases from the end near the bent portion 2 of the housing 1 to the end away from the bent portion 2 of the housing 1. The fixing ring 5 is disposed inside the guide cylinder 3 and is coaxially arranged with the guide cylinder 3.

[0020] The fixed ring 5 has six sliders 8 evenly arranged on its outer periphery. The inner wall of the guide cylinder 3 has six grooves corresponding to the positions of the six sliders 8. The six sliders are evenly arranged around the axis of the guide cylinder 3. The sliders 8 correspond one-to-one with the grooves and are slidably connected to the grooves.

[0021] The outer diameter of the fixing ring 5 is smaller than the maximum inner diameter of the guide cylinder 3, and the outer diameter of the fixing ring 5 is larger than the minimum inner diameter of the guide cylinder 3.

[0022] Preferably, the outer side of the casing 1 near the bending part 2 is provided with a plurality of connecting blocks 6 evenly arranged in a circumferential direction. The connecting blocks 6 of the two connecting mechanisms are arranged in a one-to-one correspondence, and the corresponding two connecting blocks 6 of the two connecting mechanisms are connected by bolts 7.

[0023] Preferably, a sealing ring 9 is provided between the housings 1 of the two connecting mechanisms.

[0024] During installation, the end of the steel pipe is inserted into the gap between the sleeve 1 and the guide cylinder 3. The dimensions of the sleeve 1 and the guide cylinder 3 are set according to the steel pipe to be connected, that is, the inner diameter of the steel pipe is slightly larger than the outer diameter of the guide cylinder 3, and the outer diameter of the steel pipe is slightly smaller than the inner diameter of the sleeve 1. The end of the steel pipe is inserted into the sleeve 1 near the bend 2, so that the steel pipe rests on the washer 4. Then, using a special tool, the fixing ring 5 is hammered into the guide cylinder 3, so that the outer wall of the guide cylinder 3 is tightly fitted with the inner wall of the steel pipe. At the same time, the washer 4 can be further hammered in the opposite direction of the steel pipe, so that the connection between the washer 4 and the end of the steel pipe is tighter, achieving a sealing effect. In this way, the connecting mechanism can be installed at the end of the steel pipe. Then, the two steel pipes are sealed and connected by bolts 7 in the form of a flange connection. The sealing ring 9 here plays a sealing role.

[0025] Compared with existing technologies, this pipe fitting for connecting composite steel pipes achieves a sealed connection by fitting two sleeves 1 onto the ends of the two composite steel pipes to be connected, then inserting a fixing ring 5 into the guide cylinder 3 to push the guide cylinder 3 outward, thus achieving a sealed connection with the ends of the steel pipes, and finally sealing the two sleeves 1 together with bolts 7. This not only ensures a strong connection and good sealing performance, but also avoids damage to the inner lining and is relatively easy to install.

[0026] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A pipe fitting for connecting composite steel pipes, characterized in that, It includes two connecting mechanisms, which are connected by bolts; The connecting mechanism includes a housing, a guide cylinder, and a fixing ring. The housing is cylindrical, and the guide cylinder is disposed inside the housing and coaxially arranged with the housing. One end of the housing has a bent portion, one end of which is connected to the housing, and the other end of which is connected to the end of the guide cylinder. There is a gap between the guide cylinder and the housing, and a washer is provided between the housing and the guide cylinder. One side of the washer fits against one side of the bent portion of the housing. The inner diameter of the guide cylinder gradually decreases from the end near the bent portion of the housing to the end away from the bent portion of the housing. The fixing ring is disposed inside the guide cylinder and coaxially arranged with the guide cylinder. The outer circumference of the fixed ring is evenly provided with six sliders, and the inner wall of the guide cylinder is provided with six grooves corresponding to the positions of the six sliders. The six sliders are evenly arranged around the axis of the guide cylinder, and the sliders and grooves correspond one-to-one. The sliders and grooves are slidably connected. The outer diameter of the fixing ring is smaller than the maximum inner diameter of the guide cylinder, and the outer diameter of the fixing ring is larger than the minimum inner diameter of the guide cylinder.

2. The pipe fitting for connecting composite steel pipes as described in claim 1, characterized in that, The outer side of the casing near the bending part is provided with a number of connecting blocks evenly arranged in a circumferential direction. The connecting blocks of the two connecting mechanisms are arranged in a one-to-one correspondence, and the corresponding two connecting blocks of the two connecting mechanisms are connected by bolts.

3. The pipe fitting for connecting composite steel pipes as described in claim 1, characterized in that, A sealing ring is provided between the housings of the two connecting mechanisms.

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