Water inputting and returning pipe joint of double-layer drill rod

[0024] The present invention will be described in further detail below in conjunction with the embodiments of the drawings.

[0025] The water inlet and return pipe joints of the double-layer drill pipe of this embodiment, such as Figure 1 to Figure 5 As shown, the inner tube 4 and the outer tube 8 sleeved on the inner tube 4 are included. The inner tube 4 is welded to the center of the outer tube 8. The inner tube 4 and the outer tube 8 are provided with first joints 41 and The second joint 81, the first joint 41 and the second joint 81 are respectively welded with a connecting flange 10 connected to the water pipe. At the top of the inner tube 4 from top to bottom, there are a sealing connector 1, a circular rubber gasket 2 and a first fastening flange 3 welded to the top of the inner tube 4 in order. The sealing connecting piece 1 is formed by mating and splicing two first connecting pieces 11, each first connecting piece 11 is specifically semicircular, and each first connecting piece 11 is provided with three evenly distributed first The mounting hole 13 and the first mounting hole 13 communicate with the bolt hole of the first fastening flange 3. In order to ensure the airtightness between the two first connecting pieces 11, the contacting parts of the two first connecting pieces 11 are respectively formed with first steps 12 that cooperate with each other. When the two first connecting pieces 11 are connected together, the two The bottom surface of a connecting piece 11 forms a flat surface, and the contact surface between the two first connecting pieces 11 is type.

[0026] The gasket 2 is provided with a first hole 21 communicating with the bolt hole on the first fastening flange 3. When installing, the first mounting hole 13, the first hole 21 and the first fastening flange 3 Align the bolt holes, and then fix the connection with bolts and nuts.

[0027] The top end of the outer tube 8 from top to bottom is the sealing connector 5, the rubber ring gasket 6 and the second fastening flange 7 welded to the top of the outer tube 8. The central through hole of the second fastening flange 7 is connected to the outer The pipe 8 communicates, specifically, the diameter of the central through hole of the second fastening flange 7 is the same as the inner diameter of the outer pipe 8. The sealing connecting member 5 is formed by splicing two second connecting members 51. Each second connecting member 51 has a semi-annular shape and is provided with three evenly distributed second mounting holes 53. The second mounting holes 53 are connected to the second tight The bolt holes on the fixed flange 3 are relatively aligned and connected, and the two second connecting pieces 51 are respectively formed with a second step 52 that cooperates with each other. In the state that the two second connecting pieces 51 are connected together, the two The bottom surface of the second connecting piece 51 forms a flat surface, and the contact surface between the two second connecting pieces 51 is type.

[0028] The inner diameter of the ring gasket 6 is adapted to the outer diameter of the inner tube 4, so that the ring gasket 6 can be just sleeved on the outer wall of the inner tube 4, and the ring gasket 6 is correspondingly provided with the second fastening flange 7 The bolt holes are aligned and communicated with the second hole 62; at the same time, the inner wall of the annular gasket 6 has an annular protrusion 61 extending upward, and the annular protrusion 61 is just clamped between the inner wall of the second connector 51 and the outer wall of the inner tube 4. The inner peripheral cross section of the annular gasket 6 of this shape is an "L" shape, which can seal the flange surface at the upper end of the outer tube 8 and the outer surface of the inner tube 4 as well.

[0029] A flange 9 is welded to the bottom end of the outer tube 9. The central hole 91 of the flange 9 communicates with the inner tube 4, and an annular through hole 92 is formed on the flange 9 around the central hole 91. The annular through hole 92 is connected to the inner tube. 4 The outer pipe 8 of the outer circumference communicates. The flange 9 is provided with two channels, a central hole 91 and an annular through hole 92 located on the outer ring of the central hole 91, so as to ensure the two-way flow of water in and return.

[0030] When cleaning the water inlet and return pipe joints, the first step is to clean the inner pipe 4, first remove the three screws on one of the first connecting pieces 11 on the top of the inner pipe 4, and then remove the first connecting piece 11, The circular rubber gasket 2 is opened with a small opening, and a small-diameter rod is used to pass through the opened opening to clean the silt and sand in the inner tube 4. After the cleaning is completed, the first connecting member 11 is covered, the gap is adjusted appropriately, and the screws are screwed to make it closely fit with the first step 12 of another first connecting member 11. With the joint action of the circular rubber gasket 2, a good sealing effect is achieved. The second step is to clean the outer tube 8. First, remove the three screws of one of the second connecting pieces 51 on the top of the outer tube 8, then remove the second connecting piece 51, and open a small opening on the rubber ring gasket 6, Use a small-diameter rod to pass through the raised opening to clean up the silt and sand in the outer tube 8. After the cleaning is completed, the second connecting piece 51 is covered, the gap is appropriately adjusted, and the screws are screwed to make it closely fit with the second step 52 of another second connecting piece 51. With the joint action of the rubber ring gasket 6, a good sealing effect is achieved.