A high temperature resistant and corrosion resistant screen pipe device

Abstract

The invention relates to the technical field of screen tubes and discloses a high-temperature and corrosion-resistant screen tube device, comprising a filter tube, wherein a plurality of screen slots are arranged on the filter tube, a base tube is arranged inside the filter tube, a plurality of liquid inlet holes are arranged on the base tube, connecting pieces are arranged at both ends of the filter tube, threaded strips are fixedly installed on the inner wall and the outer wall at both ends of the connecting piece, threaded grooves matching with the threaded strips are arranged on the inner walls at both ends of the filter tube, threaded grooves matching with the threaded strips are also arranged on the outer walls at both ends of the base tube, and a filter screen is slidably installed between the filter tube and the base tube. The screen tube device utilizes the flow of petroleum raw liquid to drive the movement of the guide plate to rotate the rotating ring, and the position of the telescopic rod is limited by the corrugated groove to make the sliding ring reciprocate regularly, and the elastic force of the telescopic plate is matched to make the sliding ring push the filter screen and the cleaning block thereon to reciprocate regularly, and the wedge-shaped surfaces on both sides of the cleaning block can effectively clean the sand particles in the screen slot, thereby improving the oil passing efficiency of the screen slot.

Description

Technical Field

[0001] The invention relates to the technical field of screen pipes, in particular to a high temperature resistant and corrosion resistant screen pipe device. Background Art

[0002] Screen pipes play a vital role in oil drilling and production. They are a type of filtering equipment specifically used in oil drilling and production. Screen pipes are usually made of steel or alloy materials with good corrosion resistance and high strength. Depending on the design and application, oil screen pipes can be divided into many types, including wire wound screen pipes, slotted screen pipes, elastic screen pipes, sintered filter screen pipes, spiral screen pipes, etc. Screen pipes are widely used in oilfield development, water wells, and coal mining. Their advantage is that they can effectively prevent sand and impurities from entering the oil well system, protect oil well equipment, and extend the service life of equipment. At the same time, by improving oil recovery efficiency and reducing production costs, they can bring significant economic benefits to oilfield enterprises.

[0003] In actual use, screen pipes usually need to produce oil in strata hundreds or even thousands of meters underground. Due to the complex underground environment, there are usually more sand particles on the well walls of oil wells. During the installation and use of the screen pipes, the sand particles on the well walls may continue to fall off and mix with the crude oil. When the screen pipes are extracting the crude oil, the sand particles in the crude oil may be stuck in the screen slits of the screen pipes, resulting in reduced efficiency of the screen pipes in extracting the crude oil. When the sand particles are stuck in the screen slits for a long time, the wear of the screen slits may increase, causing the screen slits to be damaged. The sand particles may enter the screen pipe from the damaged parts, reducing the filtering effect of the screen pipe. For this reason, we propose a high temperature and corrosion resistant screen pipe device. Summary of the invention

[0004] The object of the present invention is to provide a high temperature resistant and corrosion resistant screen pipe device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high temperature and corrosion resistant screen tube device, comprising a filter tube, the filter tube is provided with a plurality of screen slots for filtering sand particles, the filter tube is sleeved with a base tube, the base tube is provided with a plurality of liquid inlet holes for extracting oil, both ends of the filter tube are provided with connecting pieces, the inner wall and the outer wall at both ends of the connecting piece are fixedly installed with threaded strips, the inner walls at both ends of the filter tube are provided with threaded grooves matching with the threaded strips, the outer walls at both ends of the base tube are also provided with threaded grooves matching with the threaded strips, the two ends of the connecting piece are respectively provided with a sliding groove and a telescopic groove, a filter screen is slidably installed between the filter tube and the base tube, a fixing ring is fixedly installed at both ends of the filter screen, two of the fixing rings are respectively slidably installed in the corresponding sliding grooves and telescopic grooves, a plurality of cleaning blocks for cleaning the screen slots are provided on the filter screen, and the cleaning blocks correspond to the screen slots one by one;

[0006] A swivel is rotatably mounted on the inner wall of the connecting member, and a plurality of guide plates are fixedly mounted on the swivel, and the guide plates are all inclined and arranged in a circle. A plurality of telescopic rods are fixedly mounted on the outer wall of the swivel, and a sliding ring for pushing a fixed ring is slidably mounted in the sliding groove. A plurality of corrugated grooves for limiting the telescopic rods are arranged on the inner wall of the sliding ring, and the corrugated grooves correspond to the telescopic rods one by one, and a guide groove is connected between two adjacent corrugated grooves.

[0007] Preferably, an annular groove for limiting the telescopic rod is provided in the connecting member, the annular groove is communicated with the sliding groove, and a plurality of connecting blocks for fixedly connecting the devices on both sides of the annular groove are fixedly installed in the annular groove.

[0008] Preferably, both ends of each of the connecting blocks are configured to be wedge-shaped, and the end of each of the telescopic rods is configured to be arc-shaped.

[0009] Preferably, the connection blocks correspond to the guide grooves one-to-one, and the length of the connection blocks is smaller than the length of the guide grooves.

[0010] Preferably, a pushing ring for pushing a fixed ring is slidably installed in the telescopic groove, and a plurality of telescopic plates are fixedly installed between the pushing ring and the inner wall of the telescopic groove.

[0011] Preferably, a plurality of guide blocks are fixedly mounted on the outer wall of the sliding ring, and a plurality of limiting grooves for limiting the guide blocks are arranged in the connecting member, and the limiting grooves correspond to the guide blocks one by one.

[0012] Preferably, both sides of each cleaning block are configured to be wedge-shaped, and both sides of each sieve slot are provided with a slot matching with the cleaning block.

[0013] Preferably, the filter screen is provided with a plurality of filter holes, and a wedge-shaped piece and two wedge-shaped rods are fixedly mounted on the lower end of each cleaning block, the wedge-shaped piece and the wedge-shaped rods are both made of elastic metal material, and the wedge-shaped piece and the wedge-shaped rods are both inserted into the filter holes.

[0014] Preferably, the cross section of each of the sieve slots is arranged to be a trapezoid for facilitating the inflow of liquid, and the diameter of the filter hole is smaller than the diameter of the narrowest part of the cross section of the sieve slot.

[0015] Preferably, sealing rings are fixedly mounted on the inner walls at both ends of the filter tube and the outer walls at both ends of the base tube, and each of the fixing rings is slidably mounted between two corresponding sealing rings.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention utilizes the flow of crude petroleum to drive the movement of the guide plate to rotate the swivel ring, and through the wave-shaped groove to limit the telescopic rod, the sliding ring is allowed to slide back and forth regularly, and through the elastic force of the telescopic plate, the sliding ring pushes the filter screen and the cleaning block thereon to reciprocate regularly. The wedge surfaces on both sides of the cleaning block can effectively clean the sand particles in the screen gap, thereby improving the oil passing efficiency of the screen gap, reducing the possibility of sand particles being stuck in the screen gap for a long time, and preventing the screen gap from being damaged due to excessive friction with the sand particles.

[0018] The present invention utilizes the wedge-shaped piece and the wedge-shaped rod on the cleaning block to fix it on the filter screen. When installing the cleaning block, align the wedge-shaped piece and the wedge-shaped rod with the corresponding filter hole and then press it hard. The inclined surfaces of the wedge-shaped piece and the wedge-shaped rod will contact the edge of the filter hole, so that the wedge-shaped piece and the wedge-shaped rod will be deformed and inserted into the filter hole. Then the elasticity of the wedge-shaped piece and the wedge-shaped rod will restore them to their original state. The straight surface of the lower end will contact the inner wall of the filter screen to prevent it from moving upward. When it needs to be replaced, it can be removed by pulling it upward again, which is convenient for installing and replacing the cleaning block. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the connecting piece of the present invention;

[0021] Figure 3 It is a schematic diagram of the filter structure of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the fixing ring and the connecting piece of the present invention;

[0023] Figure 5 This is a schematic diagram of the chute structure of the present invention;

[0024] Figure 6 It is a schematic diagram of the telescopic slot structure of the present invention;

[0025] Figure 7 It is a schematic diagram of the telescopic rod structure of the present invention;

[0026] Figure 8 This is a schematic diagram of the annular groove and the connecting block structure of the present invention;

[0027] Fig. 9 This is a schematic diagram of the corrugated groove structure of the present invention;

[0028] Fig.10 This is a schematic diagram of the structure of the cleaning block of the present invention;

[0029] Fig.11 It is a schematic diagram of the wedge-shaped member and the wedge-shaped rod structure of the present invention.

[0030] In the figure: 1-filter tube; 2-screen slot; 3-base pipe; 4-liquid inlet; 5-filter screen; 6-fixing ring; 7-sealing ring; 8-connecting piece; 9-thread strip; 10-thread groove; 11-slide groove; 12-slide ring; 13-guide block; 14-limiting groove; 15-swivel ring; 16-guide plate; 17-telescopic groove; 18-telescopic plate; 19-pushing ring; 20-telescopic rod; 21-guide groove; 22-corrugated groove; 23-annular groove; 24-connecting block; 25-cleaning block; 26-card slot; 27-filter hole; 28-wedge-shaped piece; 29-wedge-shaped rod. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1-11 The present invention provides a technical solution: a high temperature resistant and corrosion resistant screen tube device, comprising a filter tube 1, the outer wall of the filter tube 1 is coated with an anti-corrosion coating, which improves the corrosion resistance of the screen tube device, and a plurality of screen slots 2 for filtering sand particles are arranged on the filter tube 1, a base pipe 3 is arranged inside the filter tube 1, and a plurality of liquid inlet holes 4 for extracting oil are arranged on the base pipe 3, and a connecting piece 8 is arranged at both ends of the filter tube 1, and a thread strip 9 is fixedly installed on the inner wall and the outer wall of both ends of the connecting piece 8, and a thread groove 10 matching with the thread strip 9 is arranged on the inner wall of both ends of the filter tube 1, and a thread groove 10 matching with the thread strip 9 is also arranged on the outer wall of both ends of the base pipe 3, and the thread strip 9 and the thread groove 10 are matched, so that the connecting piece 8 can be connected with the filter tube 1 at both ends by the matching of the thread strip 9 and the thread groove 10. The filter tube 1 and the base pipe 3 are fixedly connected, and a slide groove 11 and a telescopic groove 17 are respectively provided at both ends of the connecting piece 8. A filter screen 5 is slidably installed between the filter tube 1 and the base pipe 3. A fixing ring 6 is fixedly installed at both ends of the filter screen 5. The two fixing rings 6 are slidably installed in the corresponding slide groove 11 and the telescopic groove 17 respectively. After the initial filtration of the oil raw liquid through the screen gap 2, it is filtered through the secondary filtration of the filter screen 5 and finally enters the base pipe 3 through the liquid inlet hole 4, which improves the filtering effect of the screen tube device. The inner wall at both ends of the filter tube 1 and the outer wall at both ends of the base pipe 3 are fixedly installed with a sealing ring 7. Each fixing ring 6 is slidably installed between two corresponding sealing rings 7. When the filter screen 5 slides, the sealing ring 7 can prevent the oil raw liquid from entering the slide groove 11 and the telescopic groove 17.

[0033] A swivel 15 is rotatably mounted on the inner wall of the connecting member 8, and a plurality of guide plates 16 are fixedly mounted on the swivel 15. The guide plates 16 are all inclined and arranged in a circle. When the crude oil enters the base pipe 3, it will continue to flow into the connecting member 8. Since the guide plates 16 are all inclined, they will be driven by the crude oil to drive the swivel 15 to perform a circular motion. A plurality of telescopic rods 20 are fixedly mounted on the outer wall of the swivel 15. A sliding ring 12 for pushing the fixed ring 6 is slidably mounted in the slide groove 11. A plurality of guide blocks 13 are fixedly mounted on the outer wall of the sliding ring 12. A plurality of limiting grooves 14 for limiting the guide blocks 13 are arranged in the connecting member 8. The limiting grooves 14 correspond to the guide blocks 13 one by one. A plurality of limiting grooves 14 for limiting the guide blocks 13 are arranged on the inner wall of the sliding ring 12. The telescopic rod 20 is limited by the corrugated groove 22, and the corrugated groove 22 corresponds to the telescopic rod 20 one by one. The guide groove 21 is connected between two adjacent corrugated grooves 22. The swivel 15 will drive the telescopic rod 20 thereon to perform circular motion synchronously. The limiting groove 14 limits the guide block 13 so that the sliding ring 12 can only slide linearly in the slide groove 11 along the limiting groove 14. When the telescopic rod 20 is located in the guide groove 21, the sliding ring 12 will not move. When the telescopic rod 20 enters the corrugated groove 22 from the guide groove 21, the sliding ring 12 will slide back and forth. After passing through the corrugated groove 22, the telescopic rod 20 will enter the guide groove 21 again, and the sliding ring 12 will also reset. As the swivel 15 drives the telescopic rod 20 to rotate continuously, it will drive the sliding ring 12 to move regularly. The connecting piece 8 is provided with an annular groove 23 for limiting the telescopic rod 20, the annular groove 23 is communicated with the slide groove 11, and a plurality of connecting blocks 24 for fixing and connecting the devices on both sides of the annular groove 23 are fixedly installed in the annular groove 23. Both ends of each connecting block 24 are set to be wedge-shaped, and the end of each telescopic rod 20 is set to be arc-shaped. The connecting blocks 24 correspond to the guide groove 21 one by one, and the length of the connecting block 24 is less than the length of the guide groove 21. The connecting blocks 24 are fixedly connected to the connecting piece 8 parts on both sides of the annular groove 23. When the telescopic rod 20 moves in the guide groove 21, since the length of the connecting block 24 is less than the length of the guide groove 21, the telescopic rod 20 will first move a distance in the guide groove 21 and then contact the connecting block 24, and move along the connecting block 24. The inclined surface of the connecting block 24 retracts. When the telescopic rod 20 passes through the connecting block 24, it will pop out again and re-enter the guide groove 21, and then enter the corrugated groove 22. Since the sliding ring 12 will not move when the telescopic rod 20 moves in the guide groove 21, the connecting block 24 makes the telescopic rod 20 extend and retract without affecting the movement of the sliding ring 12. A pushing ring 19 for pushing the fixed ring 6 is slidably installed in the telescopic groove 17. A plurality of telescopic plates 18 are fixedly installed between the pushing ring 19 and the inner wall of the telescopic groove 17. In the initial state, the filter screen 5 and the fixed ring 6 are pushed by the elastic force of the telescopic plate 18, and will move into the slide groove 11 in the one end connector 8, and make the fixed ring 6 in the slide groove 11 contact with the sliding ring 12. When the sliding ring 12 slides back and forth,It will first move forward and push the fixed ring 6 and the filter 5 to move into the telescopic groove 17 in the other end connector 8. The push ring 19 in the telescopic groove 17 will compress the telescopic plate 18. Then, when the sliding ring 12 moves in the reverse direction to reset, it will no longer push the fixed ring 6 and the filter 5. The elastic force of the telescopic plate 18 will push the filter 5 and the fixed ring 6 to move in the reverse direction to reset, so that the fixed ring 6 and the filter 5 will perform a timed reciprocating motion synchronously with the sliding ring 12.

[0034] The filter screen 5 is provided with a plurality of cleaning blocks 25 for cleaning the screen slots 2. The cleaning blocks 25 correspond to the screen slots 2 one by one. Both sides of each cleaning block 25 are set into a wedge shape, and both sides of each screen slot 2 are provided with a slot 26 matching the cleaning block 25. When the filter screen 5 reciprocates, it will drive the cleaning block 25 to reciprocate. The cleaning block 25 will reciprocate in the screen slot 2. The sand particles in the screen slot 2 will move upward along the wedge-shaped surfaces on both sides of the cleaning block 25 and be cleaned out of the screen slot 2. The cleaning block 25 moves When the filter moves to the two sides of the screen slot 2, it will enter the corresponding card slot 26, so that the sand particles at both ends of the screen slot 2 can also be cleaned. As the oil raw liquid is continuously extracted, the swivel 15 will continue to rotate, and the filter screen 5 will drive the cleaning block 25 to continuously perform regular reciprocating motion to regularly clean the sand particles in the screen slot 2, thereby reducing the possibility of sand particles being stuck in the screen slot 2 for a long time and improving the oil passing efficiency of the screen slot 2. The filter screen 5 is provided with a plurality of filter holes 27, and each cleaning block 25 is fixedly installed with a wedge 28 at the lower end thereof to connect with the two The wedge-shaped piece 28 and the wedge-shaped rod 29 are both made of elastic metal material, and the wedge-shaped piece 28 and the wedge-shaped rod 29 are both inserted into the filter hole 27. When installing the cleaning block 25, it is only necessary to align the wedge-shaped piece 28 and the wedge-shaped rod 29 with the corresponding filter hole 27, and then press hard, and the inclined surfaces of the wedge-shaped piece 28 and the wedge-shaped rod 29 will contact the edge of the filter hole 27. Since the wedge-shaped piece 28 and the wedge-shaped rod 29 are both made of elastic metal material, the wedge-shaped piece 28 and the wedge-shaped rod 29 will be deformed and inserted into the filter hole 27. Then the wedge-shaped piece 28 and the wedge-shaped rod 29 return to their original shape due to their own elasticity, and the straight surface of their lower end will contact the inner wall of the filter screen 5 to prevent it from moving upward, so that the cleaning block 25 is fixed to the filter screen 5. When the cleaning block 25 needs to be replaced, it can be removed by pulling it upward again, which is convenient for installing and replacing the cleaning block 25. The cross-section of each screen slot 2 is set to a trapezoid for easy liquid inflow, and the diameter of the filter hole 27 is smaller than the diameter of the narrowest part of the cross-section of the screen slot 2, which improves the accuracy of the filter screen 5 during secondary filtration.

[0035] Specifically, first, the threaded strip 9 cooperates with the threaded groove 10 to enable the connector 8 to be fixedly connected to the filter tube 1 and the base pipe 3 at both ends. After the crude oil is initially filtered through the sieve slit 2, it is then filtered twice through the filter screen 5 and finally enters the base pipe 3 through the liquid inlet hole 4. After the crude oil enters the base pipe 3, it will continue to flow into the connector 8. Since the guide plates 16 are all inclined, they will be driven by the crude oil to drive the swivel 15 to perform circular motion. The swivel 15 will drive the telescopic rod 20 thereon to perform circular motion synchronously. The limit groove 14 limits the guide block 13, so that the sliding ring 12 can only slide linearly in the slide groove 11 along the limit groove 14. When the telescopic rod 20 enters the corrugated groove 22 from the guide groove 21, the sliding ring 12 will slide back and forth , after the telescopic rod 20 passes through the corrugated groove 22, it will enter the guide groove 21 again, and the sliding ring 12 will also reset. As the swivel 15 drives the telescopic rod 20 to rotate continuously, it will drive the sliding ring 12 to slide back and forth regularly, and the connecting block 24 fixes the connecting piece 8 components on both sides of the annular groove 23. When the telescopic rod 20 moves in the guide groove 21, since the length of the connecting block 24 is less than the length of the guide groove 21, the telescopic rod 20 will first move a distance in the guide groove 21 and then contact the connecting block 24, and will retract along the inclined surface of the connecting block 24. When the telescopic rod 20 passes through the connecting block 24, it will pop out again and re-enter the guide groove 21, and then enter the corrugated groove 22. As the telescopic rod 20 moves in the guide groove 21, the sliding ring 12 will not move, so the connecting block 24 makes the telescopic rod 20 telescopic without affecting the movement of the sliding ring 12. In the initial state, the filter 5 and the fixed ring 6 are pushed by the elastic force of the telescopic plate 18 to move into the slide groove 11 in the connecting piece 8 at one end, and the fixed ring 6 in the slide groove 11 contacts the sliding ring 12. When the sliding ring 12 slides back and forth, it will first move forward and push the fixed ring 6 and the filter 5 to move into the telescopic groove 17 in the connecting piece 8 at the other end. The pushing ring 19 in the telescopic groove 17 will compress the telescopic plate 18, and then when the sliding ring 12 moves in the reverse direction to reset, it will no longer push the fixed ring 6 and the filter 5. The elastic force of the telescopic plate 18 will push the filter 5 and the fixed ring 6 to move in the reverse direction to reset, so that the fixed ring 6 and the filter 5 move with The sliding ring 12 performs a timed reciprocating motion synchronously. When the filter screen 5 slides, the sealing ring 7 can prevent the crude oil from entering the slide groove 11 and the telescopic groove 17. When the filter screen 5 performs a reciprocating motion, it will drive the cleaning block 25 to perform a reciprocating motion. The cleaning block 25 will reciprocate in the screen slot 2. The sand in the screen slot 2 will move upward along the wedge-shaped surfaces on both sides of the cleaning block 25 and be cleaned out of the screen slot 2. When the cleaning block 25 moves to both sides of the screen slot 2, it will enter the corresponding card slot 26, so that the sand at both ends of the screen slot 2 can also be cleaned. As the crude oil is continuously extracted, the swivel 15 will continue to rotate, and the filter screen 5 will drive the cleaning block 25 to perform a timed reciprocating motion continuously to regularly clean the sand in the screen slot 2. When the cleaning block 25 is installed,Just align the wedge 28 and the wedge rod 29 with the corresponding filter hole 27, and then press hard, the inclined surfaces of the wedge 28 and the wedge rod 29 will contact the edge of the filter hole 27. Since the wedge 28 and the wedge rod 29 are made of elastic metal material, the wedge 28 and the wedge rod 29 will be deformed and inserted into the filter hole 27, and then the elasticity of the wedge 28 and the wedge rod 29 will restore it to its original shape, and the straight surface of its lower end will contact the inner wall of the filter screen 5 to prevent it from moving upward, so that the cleaning block 25 is fixed to the filter screen 5. When the cleaning block 25 needs to be replaced, it can be removed by pulling it upward again, which is convenient for installing and replacing the cleaning block 25.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high temperature and corrosion resistant screen tube device, comprising a filter tube (1), characterized in that: The filter tube (1) is provided with a plurality of sieve slots (2) for filtering sand particles. The filter tube (1) is provided with a base tube (3) in its sleeve. The base tube (3) is provided with a plurality of liquid inlet holes (4) for extracting oil. Connectors (8) are provided at both ends of the filter tube (1). Threaded strips (9) are fixedly mounted on the inner wall and outer wall of both ends of the connecting piece (8). Threaded grooves (10) matching the threaded strips (9) are provided on the inner walls at both ends of the filter tube (1). Threaded grooves (10) matching the threaded strips (9) are also provided on the outer walls at both ends of the base tube (3). (9) a threaded groove (10) matching with the threaded groove (10), the two ends of the connecting member (8) are respectively provided with a sliding groove (11) and a telescopic groove (17), a filter screen (5) is slidably installed between the filter tube (1) and the base tube (3), a fixing ring (6) is fixedly installed at both ends of the filter screen (5), and the two fixing rings (6) are respectively slidably installed in the corresponding sliding groove (11) and the telescopic groove (17), and a plurality of cleaning blocks (25) for cleaning the screen slots (2) are provided on the filter screen (5), and the cleaning blocks (25) correspond to the screen slots (2) one by one; A swivel (15) is rotatably mounted on the inner wall of the connecting member (8), and a plurality of guide plates (16) are fixedly mounted on the swivel (15). The guide plates (16) are all arranged in an inclined manner and arranged in a circle. A plurality of telescopic rods (20) are fixedly mounted on the outer wall of the swivel (15). A sliding ring (12) for pushing the fixed ring (6) is slidably mounted in the sliding groove (11). A plurality of corrugated grooves (22) for limiting the telescopic rods (20) are arranged on the inner wall of the sliding ring (12). The corrugated grooves (22) correspond to the telescopic rods (20) one by one, and a guide groove (21) is connected between two adjacent corrugated grooves (22).

2. A high temperature and corrosion resistant screen pipe device according to claim 1, characterized in that: An annular groove (23) for limiting the telescopic rod (20) is provided in the connecting member (8); the annular groove (23) is communicated with the slide groove (11); and a plurality of connecting blocks (24) for fixedly connecting devices on both sides of the annular groove (23) are fixedly installed in the annular groove (23).

3. A high temperature and corrosion resistant screen pipe device according to claim 2, characterized in that: Both ends of each connection block (24) are configured in a wedge shape, and the end of each telescopic rod (20) is configured in an arc shape.

4. A high temperature and corrosion resistant screen pipe device according to claim 3, characterized in that: The connection blocks (24) correspond to the guide grooves (21) one by one, and the length of the connection blocks (24) is smaller than the length of the guide grooves (21).

5. The high temperature and corrosion resistant screen pipe device according to claim 1, characterized in that: A pushing ring (19) for pushing the fixed ring (6) is slidably mounted in the telescopic groove (17), and a plurality of telescopic plates (18) are fixedly mounted between the pushing ring (19) and the inner wall of the telescopic groove (17).

6. The high temperature and corrosion resistant screen pipe device according to claim 1, characterized in that: A plurality of guide blocks (13) are fixedly mounted on the outer wall of the sliding ring (12), and a plurality of limiting grooves (14) for limiting the guide blocks (13) are arranged in the connecting member (8), wherein the limiting grooves (14) correspond one to one with the guide blocks (13).

7. The high temperature and corrosion resistant screen pipe device according to claim 1, characterized in that: Both sides of each cleaning block (25) are arranged in a wedge shape, and both sides of each sieve slot (2) are provided with a slot (26) matching with the cleaning block (25).

8. A high temperature and corrosion resistant screen pipe device according to claim 7, characterized in that: The filter screen (5) is provided with a plurality of filter holes (27), and a wedge-shaped piece (28) and two wedge-shaped rods (29) are fixedly mounted on the lower end of each cleaning block (25), the wedge-shaped piece (28) and the wedge-shaped rods (29) are both made of elastic metal material, and the wedge-shaped piece (28) and the wedge-shaped rods (29) are both inserted into the filter hole (27).

9. A high temperature resistant and corrosion resistant screen pipe device according to claim 8, characterized in that: The cross section of each of the sieve slits (2) is arranged to be a trapezoidal shape that facilitates the inflow of liquid, and the diameter of the filter hole (27) is smaller than the diameter of the narrowest part of the cross section of the sieve slit (2).

10. The high temperature and corrosion resistant screen pipe device according to claim 1, characterized in that: Sealing rings (7) are fixedly mounted on the inner walls at both ends of the filter tube (1) and the outer walls at both ends of the base tube (3), and each of the fixing rings (6) is slidably mounted between two corresponding sealing rings (7).

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