Straight-through type telescopic scratch-resistant thermal recovery casing head

Abstract

The invention relates to the technical field of petroleum drilling wellhead devices, and discloses a straight-through type telescopic anti-scraping thermal recovery casing head which comprises a casing head body, and a telescopic sealing pipe is arranged in the center of the casing head body; the coupling is connected to the top end of the telescopic sealing pipe; the fixed sealing seat is arranged between the casing head and the telescopic sealing pipe; the anti-scraping ring is connected to the bottom end of the fixed sealing seat in a sliding mode, and the inner ring end of the anti-scraping ring makes contact with the surface of the telescopic sealing pipe; and the pressure control unit is used for controlling the contact pressure between the anti-scraping ring and the telescopic sealing pipe. The anti-scraping ring is arranged at the bottom end of the fixed sealing seat, so that impurities on the telescopic sealing pipe are prevented from damaging a sealing piece when moving upwards; the pressure control unit is adopted to dynamically adjust the contact pressure of the anti-scraping ring and the telescopic sealing pipe, the abrasion degree of the telescopic sealing pipe is reasonably controlled while the anti-scraping effect is guaranteed, the service life of the telescopic sealing pipe and the service life of the anti-scraping ring are prolonged, and the equipment maintenance cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling wellhead devices, and more specifically to a straight-through retractable anti-scratch thermal recovery casing head. Background Art

[0002] Thermal recovery technology has been widely used in the field of oil production, especially in the production of heavy oil and extra-heavy oil. In order to ensure the integrity of the oil well casing during thermal recovery and avoid casing damage caused by thermal expansion and contraction, a retractable thermal recovery casing head is used, which allows the casing to be expanded and contracted within a certain range in the axial direction, so that the casing can be freely expanded and contracted during thermal expansion and contraction without excessive stress due to constraints, thereby extending the service life of the casing.

[0003] In the prior art, for example, the utility model patent with application number CN202221488387.6 discloses a telescopic thermal recovery casing head, including: the lower end of the casing head body is threadedly connected to the surface casing, the oil layer casing is located in the inner cavity of the surface casing, wherein the upper end of the oil layer casing is threadedly connected to the straight-through pipe, a sealing disk is installed between the inner wall of the casing head body and the straight-through pipe, an inner sealing ring and a cone ring are provided on the inner side of the sealing disk, the inner sealing ring is located on the upper side of the cone ring, the upper outer circle of the straight-through pipe is provided with a protective sleeve, and the straight-through pipe and the protective sleeve are provided with a sliding fit. In this thermal recovery casing head, the straight-through pipe scrapes away these debris through the cone ring during the up and down sliding process. In actual use, the cone ring is tightly attached to the surface of the straight-through pipe, and a certain amount of wear will also occur to the surface of the straight-through pipe during the scraping process.

[0004] Therefore, it is necessary to propose a straight-through retractable anti-scratch thermal recovery casing head to at least partially solve the problems existing in the prior art. Summary of the invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0006] In order to at least partially solve the above problems, the present invention provides a straight-through retractable anti-scratch thermal recovery casing head, comprising:

[0007] A casing head, wherein a telescopic sealing tube is arranged at the center of the casing head;

[0008] A coupling is connected to the top of the telescopic sealing tube;

[0009] A fixed sealing seat, which is arranged between the casing head and the telescopic sealing tube;

[0010] An anti-scratch ring, which is slidably connected to the bottom end of the fixed sealing seat, and the inner ring end of the anti-scratch ring contacts the surface of the telescopic sealing tube;

[0011] The pressure control unit is used to control the contact pressure between the anti-scratch ring and the telescopic sealing tube.

[0012] Preferably, a pressure sensor is provided on the anti-scratch ring for collecting the real-time contact pressure between the anti-scratch ring and the telescopic sealing tube.

[0013] Preferably, a stop screw is provided through the top flange of the casing head, the stop screw is perpendicular to the axis of the telescopic sealing tube, a limiting groove is provided on the outer circle of the fixed sealing seat, the end of the stop screw is clamped in the limiting groove, and a position sensor is provided on the end of the stop screw.

[0014] Preferably, the anti-scratch ring adopts a split structure and includes at least two anti-scratch ring bodies, and the multiple anti-scratch ring bodies slide relatively and surround to form the entire anti-scratch ring structure.

[0015] Preferably, a pressure regulating chamber is provided at the lower part of the fixed sealing seat, and the pressure regulating chamber includes:

[0016] A hydraulic cylinder, the hydraulic cylinder is horizontally connected to the pressure regulating chamber of the fixed sealing seat, the output end of the hydraulic cylinder is connected to a hydraulic rod, and a guide sleeve is provided on the side of the pressure regulating chamber opposite to the hydraulic cylinder; the hydraulic rod is slidably connected to the guide sleeve, and a spring is connected between the end of the hydraulic rod and the inner wall of the guide sleeve;

[0017] The support frame is set to be L-shaped, the top end of the support frame is connected to the hydraulic rod, and the bottom end is connected to the anti-scratch ring; a sliding groove for the anti-scratch ring to slide is set on the fixed sealing seat, and a sealing gasket is connected at the contact position between the fixed sealing seat and the anti-scratch ring.

[0018] Preferably, a conical ring piece is connected to the bottom end of the fixed sealing seat, the inner ring end of the conical ring piece is higher than the outer ring end, and the inner ring end of the conical ring piece is arranged close to the anti-scratch ring; a leakage pipe is connected to the side of the sleeve head, and the leakage pipe is arranged close to the outer ring end of the conical ring piece.

[0019] Preferably, the pressure regulating chamber further includes a ring plate vibration assembly, and the ring plate vibration assembly includes:

[0020] A fixed seat, the fixed seat is connected to the pressure regulating chamber, and a column is connected to the center of the fixed seat;

[0021] The disc is concentrically connected to the column, and two discs are arranged at intervals up and down;

[0022] A rotating seat, which is rotatably connected to the bottom end of the fixed seat;

[0023] The telescopic member is hinged between the rotating seat and the disc, and multiple telescopic members are evenly arranged along the circumference of the disc. The telescopic member is made of memory alloy material and has a tendency to shorten when the temperature rises;

[0024] A rotating shaft connected to the bottom end of the rotating seat;

[0025] Vibration blocks, multiple vibration blocks are evenly connected to the bottom end of the rotating shaft along the circumferential direction, and the vibration blocks are in contact with the upper surface of the conical ring sheet.

[0026] Preferably, a flexible sealing joint assembly is arranged on the upper part of the fixed sealing seat, and the flexible sealing joint assembly comprises:

[0027] The joint seat is connected to the inner side of the fixed sealing seat, and the top and bottom ends of the joint seat are provided with arc-shaped mounting grooves;

[0028] The sealing joint is installed in the joint seat, and the top and bottom ends of the sealing joint are provided with arc-shaped mounting surfaces, which are rotatably connected with the arc-shaped mounting groove and cannot be disengaged; a fixing ring is provided inside the sealing joint;

[0029] The sealing ring is connected to the inner wall of the fixing ring, the sealing ring is made of elastic material, and the sealing ring is closely connected to the outer wall of the telescopic sealing tube.

[0030] Preferably, the flexible sealing joint assembly further comprises:

[0031] A sleeve connected to the outside of the fixing ring;

[0032] A reset pressure rod, which is slidably connected to the outer end of the sleeve, and a spring is connected between the reset pressure rod and the end of the sleeve;

[0033] An elastic support frame is arranged on the upper part of the fixed sealing seat. The elastic support frame is arranged as a wavy structure. The end of the reset pressure rod is crimped into the central depression of the elastic support frame. Both ends of the elastic support frame are installed in the clamping seat on the inner wall of the fixed sealing seat. The elastic support frame is made of memory alloy material. The elastic support frame has a tendency to straighten when the temperature rises.

[0034] Preferably, a sealing reinforcement component is provided in the flexible sealing joint component, and the sealing reinforcement component comprises:

[0035] A first sealing airbag, the first sealing airbag is arranged inside the sealing ring;

[0036] A second sealing airbag, the second sealing airbag is connected between the arc-shaped mounting surface and the arc-shaped mounting groove;

[0037] The airflow pipeline is arranged in the flexible sealing joint component and is connected with the first sealing airbag and the second sealing airbag.

[0038] Compared with the prior art, the present invention has at least the following beneficial effects:

[0039] The present invention provides a straight-through telescopic anti-scratch thermal mining casing head, in which an anti-scratch ring is arranged at the bottom end of a fixed sealing seat to prevent impurities attached to the telescopic sealing tube from damaging the seal of the fixed sealing seat when ascending; a pressure control unit is used to realize dynamic adjustment of the contact pressure between the anti-scratch ring and the telescopic sealing tube, which can reasonably control the wear degree of the telescopic sealing tube while ensuring the anti-scratch effect according to actual working conditions, thereby extending the service life of the telescopic sealing tube and the anti-scratch ring and reducing the maintenance cost of the equipment.

[0040] The straight-through retractable anti-scratch thermal recovery casing head described in the present invention, other advantages, objectives and features of the present invention will be partially reflected in the following description, and will also be partially understood by technicians in this field through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0042] Figure 1 It is a schematic cross-sectional structure diagram of a straight-through retractable scratch-resistant thermal mining casing head of the present invention;

[0043] Figure 2 It is a schematic diagram of the cross-sectional structure of the fixed sealing seat in the present invention;

[0044] Figure 3 It is a schematic diagram of a partial cross-sectional structure of a fixed sealing seat in the present invention;

[0045] Figure 4 is a schematic cross-sectional structure diagram of the flexible sealing joint assembly of the present invention;

[0046] Figure 5 For the present invention Figure 4 Schematic diagram of the local enlarged structure at A in the middle (initial state);

[0047] Figure 6 For the present invention Figure 4 Schematic diagram of the local enlarged structure at A in the middle (rotated state);

[0048] Figure 7 It is a schematic diagram of the cross-sectional structure of the ring plate vibration assembly in the present invention;

[0049] Figure 8 It is a schematic diagram of the internal structure of the ring plate vibration component in the present invention.

[0050] In the figure: 1. coupling; 3. telescopic sealing tube; 4. casing head; 5. fixed sealing seat; 6. anti-scratch ring; 8. stop screw; 9. limit groove; 11. hydraulic cylinder; 12. hydraulic rod; 13. guide sleeve; 15. support frame; 16. conical ring piece; 21. joint seat; 22. sealing joint; 23. arc-shaped mounting groove; 24. arc-shaped mounting surface; 25. fixing ring; 26. sealing ring; 27. sleeve; 28. reset pressure rod; 29. ​​spring; 31. elastic support frame; 32. clamping seat; 33. first sealing airbag; 34. second sealing airbag; 35. air flow pipeline; 41. fixed seat; 42. column; 43. disc; 44. rotating seat; 45. telescopic member; 46. rotating shaft; 47. vibration block. DETAILED DESCRIPTION

[0051] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0052] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0053] Embodiment 1:

[0054] like Figure 1-Figure 3 As shown, the present invention provides a straight-through retractable anti-scratch thermal mining casing head, comprising:

[0055] A casing head 4, wherein a telescopic sealing tube 3 is arranged at the center of the casing head 4;

[0056] A coupling 1, wherein the coupling 1 is connected to the top end of the telescopic sealing tube 3;

[0057] A fixed sealing seat 5, which is arranged between the casing head 4 and the telescopic sealing tube 3;

[0058] An anti-scratch ring 6, which is slidably connected to the bottom end of the fixed sealing seat 5, and the inner ring end of the anti-scratch ring 6 contacts the surface of the telescopic sealing tube 3;

[0059] A pressure control unit is used to control the contact pressure between the anti-scratch ring 6 and the telescopic sealing tube 3 .

[0060] A pressure sensor is provided on the anti-scratch ring 6 for collecting the real-time contact pressure between the anti-scratch ring 6 and the telescopic sealing tube 3 .

[0061] The working principle and beneficial effects of the above technical solution are:

[0062] The present invention provides a straight-through retractable anti-scratch thermal mining casing head, wherein a retractable sealing tube 3 is arranged at the center of a casing head 4 and forms an annulus, the top of the retractable sealing tube 3 is connected to a coupling 1, and a fixed sealing seat 5 is arranged at the bottom of the coupling 1 to seal the annulus; an anti-scratch ring 6 is arranged at the bottom of the fixed sealing seat 5. When the thermal mining casing head is used, the retractable sealing tube 3 moves upward under the action of high temperature, driving the coupling 1 to extend upward, and the retractable sealing tube 3 slides relative to the anti-scratch ring 6, and the anti-scratch ring 6 scrapes impurities on the outer wall of the retractable sealing tube 3 to prevent the impurities from damaging the seal of the fixed sealing seat 5 when going upward; after use, the temperature decreases to make the retractable sealing tube 3 slide downward and fall back to a preset position. A pressure sensor is arranged on the anti-scratch ring 6, and the real-time contact pressure between the anti-scratch ring 6 and the retractable sealing tube 3 is detected by the pressure sensor. The pressure control unit regulates the pressure between the anti-scratch ring 6 and the retractable sealing tube 3, controls the contact pressure within a preset range, and controls the wear degree of the anti-scratch ring 6 on the retractable sealing tube 3 on the premise of ensuring that the anti-scratch ring 6 can effectively block debris.

[0063] Through the above-mentioned structural design, a straight-through retractable anti-scratch thermal mining casing head is provided, and an anti-scratch ring 6 is arranged at the bottom end of the fixed sealing seat 5 to prevent impurities attached to the telescopic sealing tube 3 from damaging the seal of the fixed sealing seat 5 when ascending; a pressure control unit is used to realize dynamic adjustment of the contact pressure between the anti-scratch ring 6 and the telescopic sealing tube 3, which can reasonably control the wear degree of the telescopic sealing tube 3 while ensuring the anti-scratch effect according to actual working conditions, thereby extending the service life of the telescopic sealing tube 3 and the anti-scratch ring 6 and reducing the maintenance cost of the equipment.

[0064] Embodiment 2:

[0065] like Figure 1 , Figure 2 As shown, on the basis of the above-mentioned embodiment 1, a stop screw 8 is provided through the top flange of the casing head 4, the stop screw 8 is perpendicular to the axis of the telescopic sealing tube 3, a limiting groove 9 is provided on the outer circle of the fixed sealing seat 5, and the end of the stop screw 8 is clamped in the limiting groove 9; a position sensor is provided at the end of the stop screw 8.

[0066] The working principle and beneficial effects of the above technical solution are:

[0067] A limiting groove 9 is provided at the outer circumference of the fixed sealing seat 5, and the fixed sealing seat 5 is prevented from moving up by the locking position of the stop screw 8, thereby ensuring the stability of the thermal sleeve head during use and effectively avoiding the risk of the telescopic sealing tube 3 pushing out the fixed sealing seat 5 when it expands and contracts; a position sensor is provided at the end of the stop screw 8, and the position of the stop screw 8 is detected by the position sensor to determine the shear state of the stop screw 8.

[0068] Embodiment 3:

[0069] On the basis of the above-mentioned embodiment 1, the anti-scratch ring 6 adopts a split structure, including at least two anti-scratch ring 6 ring bodies, and the multiple anti-scratch ring 6 ring bodies slide relatively and surround to form the entire anti-scratch ring 6 structure.

[0070] The working principle and beneficial effects of the above technical solution are:

[0071] The anti-scratch ring 6 adopts a split structure. When the telescopic sealing tube 3 is under high temperature and high pressure, or is in a state of long-term operation and wear, and there are certain irregularities on the surface, each ring body can slide relatively and adjust the position and angle respectively to better fit the surface of the telescopic sealing tube 3; effectively improve the stability of the anti-scratch effect, ensure that debris can be reliably blocked in various situations, and protect the sealing area.

[0072] Embodiment 4:

[0073] like Figure 3 As shown, on the basis of the above-mentioned embodiment 3, a pressure regulating chamber is provided at the lower part of the fixed sealing seat 5, and the pressure regulating chamber includes:

[0074] A hydraulic cylinder 11, which is horizontally connected to the pressure regulating chamber of the fixed sealing seat 5, and a hydraulic rod 12 is connected to the output end of the hydraulic cylinder 11. A guide sleeve 13 is provided on the side of the pressure regulating chamber directly opposite to the hydraulic cylinder 11; the hydraulic rod 12 is slidably connected to the guide sleeve 13, and a spring is connected between the end of the hydraulic rod 12 and the inner wall of the guide sleeve 13;

[0075] The support frame 15 is set to be L-shaped, the top end of the support frame 15 is connected to the hydraulic rod 12, and the bottom end is connected to the anti-scratch ring 6; a sliding groove for the anti-scratch ring 6 to slide is set on the fixed sealing seat 5, and a sealing gasket is connected at the contact position between the fixed sealing seat 5 and the anti-scratch ring 6.

[0076] The working principle and beneficial effects of the above technical solution are:

[0077] A pressure sensor is provided on the anti-scratch ring 6, and the real-time contact pressure between the anti-scratch ring 6 and the telescopic sealing tube 3 is detected by the pressure sensor. When the real-time contact pressure is less than the preset value, it indicates that the contact pressure of the anti-scratch ring 6 on the telescopic sealing tube 3 is insufficient, and the debris attached to the telescopic sealing tube 3 cannot be effectively blocked. At this time, the hydraulic cylinder 11 is started to extend, and the hydraulic rod 12 drives the support frame 15 to move forward, and the anti-scratch ring 6 moves in the direction close to the telescopic sealing tube 3 until the contact pressure is within the preset range. When the real-time contact pressure is greater than the preset value, it indicates that the contact pressure of the anti-scratch ring 6 on the telescopic sealing tube 3 is large, the degree of wear on the telescopic sealing tube 3 is large, and there is a possibility of affecting the movement of the telescopic sealing tube 3. At this time, the hydraulic cylinder 11 is started to retract, and the hydraulic rod 12 drives the support frame 15 to move in the opposite direction, and the anti-scratch ring 6 moves in the direction away from the telescopic sealing tube 3 until the contact pressure is within the preset range.

[0078] A safety limit groove can be set on the telescopic sealing tube 3. When the position sensor detects that the pressure on the end of the stop screw 8 exceeds the preset value, there is a risk of shearing of the surface stop screw 8. The hydraulic cylinder 11 is started to extend the hydraulic rod 12, thereby increasing the pressure between the anti-scratch ring 6 and the telescopic sealing tube 3, and then increasing the resistance to the movement of the telescopic sealing tube 3 until the anti-scratch ring 6 is engaged in the safety limit groove, so that the telescopic sealing tube 3 no longer moves; when the telescopic sealing tube 3 is ejected due to high temperature, the anti-scratch ring 6 is actuated to delay the ejection process of the telescopic sealing tube 3, and the telescopic sealing tube 3 is locked through the safety limit groove to avoid injury to personnel after the telescopic sealing tube 3 is ejected.

[0079] Embodiment 5:

[0080] like Figure 2 , Figure 3 As shown, on the basis of the above-mentioned embodiment 4, a conical ring piece 16 is connected to the bottom end of the fixed sealing seat 5, the inner ring end of the conical ring piece 16 is higher than the outer ring end, and the inner ring end of the conical ring piece 16 is arranged close to the anti-scratch ring 6; a leakage pipe is connected to the side of the coupling 1, and the leakage pipe is arranged close to the outer ring end of the conical ring piece 16.

[0081] The working principle and beneficial effects of the above technical solution are:

[0082] A conical ring piece 16 is arranged at the bottom end of the fixed sealing seat 5, and impurities on the surface of the telescopic sealing tube 3 are scraped off by the anti-scratch ring 6. The impurities fall down after being scraped off, or accumulate on the conical ring piece 16, and are discharged outward along the conical surface at the bottom of the conical ring piece 16, effectively avoiding the problem of increased movement resistance of the telescopic sealing tube 3 caused by accumulation of impurities at the anti-scratch ring 6.

[0083] Embodiment 6:

[0084] like Figure 3 , Figure 7 , Figure 8 As shown, based on the above embodiment 5, the pressure regulating chamber further includes a ring plate vibration component, and the ring plate vibration component includes:

[0085] A fixing seat 41, the fixing seat 41 is connected to the pressure regulating chamber, and a column 42 is connected to the center of the fixing seat 41;

[0086] The disk 43 is concentrically connected to the column 42, and the disk 43 is provided in two and is spaced apart from each other;

[0087] A rotating seat 44, which is rotatably connected to the bottom end of the fixed seat 41;

[0088] A telescopic member 45 is hinged between the rotating seat 44 and the disc 43. A plurality of telescopic members 45 are evenly arranged along the circumference of the disc 43. The telescopic member 45 is made of a memory alloy material and has a tendency to shorten when the temperature rises.

[0089] A rotating shaft 46 connected to the bottom end of the rotating base 44;

[0090] Vibration blocks 47 , multiple vibration blocks 47 are evenly connected to the bottom end of the rotating shaft 46 along the circumferential direction, and the vibration blocks 47 are in contact with the upper surface of the conical ring piece 16 .

[0091] The working principle and beneficial effects of the above technical solution are:

[0092] When the thermal mining casing head is used in a high temperature environment, the ring piece vibration assembly will automatically start. The telescopic member 45 of the ring piece vibration assembly is made of memory alloy material, and as the temperature rises, the bending will intensify and the length will decrease; in the initial state, the two ends of the telescopic member 45 are respectively hinged to the rotating seat 44 and the disc 43, and the length of the telescopic member 45 is greater than the distance between the rotating seat 44 and the disc 43; as the telescopic member 45 shortens, the outer end of the telescopic member 45 pulls the rotating seat 44 to rotate, and the rotating shaft 46 at the bottom of the rotating seat 44 rotates accordingly, causing multiple vibration blocks 47 to intermittently knock and collide with the conical ring piece 16; after use, the temperature of the telescopic member 45 decreases, the deformation of the telescopic member 45 is restored to increase the length, the rotating shaft 46 rotates in the opposite direction, and the vibration block 47 knocks and collides with the conical ring piece 16 again. Through the above structural design, the ring piece vibration assembly is automatically started when the thermal recovery casing head is used. While the anti-scratch ring 6 cleans the telescopic sealing tube 3, the conical ring piece 16 is knocked to vibrate, so that the impurity deposits attached to the conical ring piece 16 fall back, thereby ensuring the cleaning effect of the impurities on the telescopic sealing tube 3.

[0093] Embodiment 7:

[0094] like Figure 3-Figure 6 As shown, on the basis of the above-mentioned embodiment 5, a flexible sealing joint component is arranged on the upper part of the fixed sealing seat 5, and the flexible sealing joint component comprises:

[0095] The joint seat 21 is connected to the inner side of the fixed sealing seat 5, and the top and bottom ends of the joint seat 21 are provided with arc-shaped mounting grooves 23;

[0096] The sealing joint 22 is installed in the joint seat 21. The top and bottom ends of the sealing joint 22 are provided with arc-shaped mounting surfaces 24. The arc-shaped mounting surfaces 24 are rotatably connected to the arc-shaped mounting groove 23 and cannot be disengaged. A fixing ring 25 is provided inside the sealing joint 22.

[0097] The sealing ring 26 is connected to the inner wall of the fixing ring 25 . The sealing ring 26 is made of elastic material and is closely connected to the outer wall of the telescopic sealing tube 3 .

[0098] The working principle and beneficial effects of the above technical solution are:

[0099] When the telescopic sealing tube 3 is used, it moves up and down frequently in a high temperature environment, which may cause local structural deformation and bending. If a separate sealing ring is used for sealing, the sealing state in the above-mentioned local area is poor, and even the sealing ring is separated from the telescopic sealing tube 3, resulting in sealing failure. Therefore, a flexible sealing joint component is set on the fixed sealing seat 5. When the telescopic sealing tube 3 undergoes structural deformation and bending during operation, it will drive the sealing ring 26 that fits it to move, and the sealing joint 22 will rotate in the joint seat 21 with the movement of the sealing ring 26, thereby adapting to the deformation and bending state of the telescopic sealing tube 3; the sealing joint 22 is installed in the joint seat 21, and the arc-shaped installation surface 24 of the sealing joint 22 rotates in the arc-shaped installation groove 23, ensuring that the sealing joint 22 can rotate flexibly without falling out of the fixed sealing seat 5.

[0100] Through the above-mentioned structural design and the rotation design of the sealing joint 22 in the joint seat 21, the entire flexible sealing joint assembly can flexibly adjust its own angle following the deformation and bending state of the telescopic sealing tube 3, so that the sealing ring 26 maintains a close fit with the outer wall of the telescopic sealing tube 3 to prevent leakage of the internal medium, effectively reduce the influence of the structural deformation of the telescopic sealing tube 3 on the sealing structure, and improve the sealing reliability of the thermal recovery casing head.

[0101] Embodiment 8:

[0102] like Figure 3-Figure 6 As shown, based on the above-mentioned embodiment 7, the flexible sealing joint assembly further includes:

[0103] A sleeve 27, the sleeve 27 is connected to the outside of the fixing ring 25;

[0104] A reset rod 28, which is slidably connected to the outer end of the sleeve 27, and a spring 29 is connected between the reset rod 28 and the end of the sleeve 27;

[0105] The elastic support frame 31 is arranged on the upper part of the fixed sealing seat 5. The elastic support frame 31 is arranged as a wavy structure. The end of the reset pressure rod 28 is crimped in the central depression of the elastic support frame 31. The two ends of the elastic support frame 31 are installed in the clamping seat 32 on the inner wall of the fixed sealing seat 5. The elastic support frame 31 is made of memory alloy material. The elastic support frame 31 has a tendency to straighten when the temperature rises.

[0106] The working principle and beneficial effects of the above technical solution are:

[0107] When the flexible sealing joint assembly is used, the reset pressure rod 28 in the sleeve 27 abuts against the depression in the center of the elastic support frame 31 under the squeezing action of the spring 29; when the sealing joint 22 rotates, the sleeve 27 and the reset pressure rod 28 are driven to rotate, and under the joint action of the spring 29 and the elastic support frame 31, the sealing joint 22 always maintains a tendency to reset to the initial position, which has a certain correction effect on the bending deformation of the telescopic sealing tube 3. The elastic support frame 31 is made of memory alloy material. When the thermal mining casing head works under high temperature, the elastic support frame 31 has a tendency to straighten, and the pressure of the elastic support frame 31 on the end of the reset pressure rod 28 increases, thereby improving the auxiliary reset effect under high temperature.

[0108] Embodiment 9:

[0109] like Figure 3-Figure 6 As shown, based on the above-mentioned embodiment 7, a sealing reinforcement component is provided in the flexible sealing joint component, and the sealing reinforcement component includes:

[0110] A first sealing airbag 33, which is disposed inside the sealing ring 26;

[0111] A second sealing airbag 34, the second sealing airbag 34 is connected between the arc-shaped mounting surface 24 and the arc-shaped mounting groove 23;

[0112] The airflow pipeline 35 is arranged in the flexible sealing joint component and is connected with the first sealing airbag 33 and the second sealing airbag 34 .

[0113] The working principle and beneficial effects of the above technical solution are:

[0114] The telescopic sealing tube 3 slides along the center of the flexible sealing joint assembly. By setting the first sealing airbag 33, the sealing ring 26 has a certain deformation range, so that it can fit tightly against the telescopic sealing tube 3 and improve the sealing effect; the telescopic sealing tube 3 squeezes the sealing ring 26 and applies pressure to the first sealing airbag 33 inside the sealing ring 26 at the same time. The airflow enters the second sealing airbag 34 through the airflow pipeline 35. The second sealing airbag 34 expands between the arc-shaped mounting surface 24 and the arc-shaped mounting groove 23 to fill the gap that may exist between the two and enhance the sealing performance between the sealing joint 22 and the joint seat 21. By setting the first sealing airbag 33 and the second sealing airbag 34, two sets of sealing structures are formed between the telescopic sealing tube 3 and the fixed sealing seat 5, and between the arc-shaped mounting surface 24 and the arc-shaped mounting groove 23, and both can fit tightly with the structure, thereby avoiding the situation where the telescopic sealing tube 3 is deformed and the sealing fails due to frequent use when the sealing ring 26 is used alone; the sealing structure between the arc-shaped mounting surface 24 and the arc-shaped mounting groove 23 is not in direct contact with the telescopic sealing tube 3, is less affected by the deformation of the telescopic sealing tube 3, and has higher sealing reliability.

[0115] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0116] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0117] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A straight-through retractable anti-scratch thermal mining casing head, characterized in that: include: A casing head (4), wherein a telescopic sealing tube (3) is arranged at the center of the casing head (4); A coupling (1), the coupling (1) being connected to the top end of the telescopic sealing tube (3); A fixed sealing seat (5), the fixed sealing seat (5) being arranged between the casing head (4) and the telescopic sealing tube (3); An anti-scratch ring (6), the anti-scratch ring (6) is slidably connected to the bottom end of the fixed sealing seat (5), and the inner ring end of the anti-scratch ring (6) is in contact with the surface of the telescopic sealing tube (3); A pressure control unit is used to control the contact pressure between the anti-scratch ring (6) and the telescopic sealing tube (3).

2. A straight-through retractable anti-scratch thermal mining casing head according to claim 1, characterized in that: A pressure sensor is arranged on the anti-scratch ring (6) for collecting the real-time contact pressure between the anti-scratch ring (6) and the telescopic sealing tube (3).

3. A straight-through retractable anti-scratch thermal mining casing head according to claim 1, characterized in that: A stop screw (8) is provided through the top flange of the casing head (4), the stop screw (8) is arranged perpendicular to the axis of the telescopic sealing tube (3), a limiting groove (9) is provided on the outer circle of the fixed sealing seat (5), the end of the stop screw (8) is clamped with the limiting groove (9), and a position sensor is provided at the end of the stop screw (8).

4. A straight-through retractable anti-scratch thermal mining casing head according to claim 2, characterized in that: The anti-scratch ring (6) adopts a split structure and comprises at least two anti-scratch ring (6) ring bodies. The multiple anti-scratch ring (6) ring bodies slide relative to each other and surround to form the entire anti-scratch ring (6) structure.

5. The straight-through retractable scratch-resistant thermal mining casing head according to claim 1, characterized in that: A pressure regulating chamber is provided at the lower part of the fixed sealing seat (5), and the pressure regulating chamber includes: A hydraulic cylinder (11), the hydraulic cylinder (11) is horizontally connected to the pressure regulating chamber of the fixed sealing seat (5), the output end of the hydraulic cylinder (11) is connected to a hydraulic rod (12), and a guide sleeve (13) is provided on the side of the pressure regulating chamber directly opposite to the hydraulic cylinder (11); the hydraulic rod (12) is slidably connected to the guide sleeve (13), and a spring is connected between the end of the hydraulic rod (12) and the inner wall of the guide sleeve (13); The support frame (15) is arranged in an L-shape, the top end of the support frame (15) is connected to the hydraulic rod (12), and the bottom end is connected to the anti-scratch ring (6); a slide groove for the anti-scratch ring (6) to slide is arranged on the fixed sealing seat (5), and a sealing pad is connected at the contact position between the fixed sealing seat (5) and the anti-scratch ring (6).

6. A straight-through retractable anti-scratch thermal mining casing head according to claim 5, characterized in that: The bottom end of the fixed sealing seat (5) is connected to a conical ring piece (16), the inner ring end of the conical ring piece (16) is higher than the outer ring end, and the inner ring end of the conical ring piece (16) is arranged close to the anti-scratch ring (6); the side of the sleeve head (4) is connected to a drainage pipe, and the drainage pipe is arranged close to the outer ring end of the conical ring piece (16).

7. A straight-through retractable anti-scratch thermal mining casing head according to claim 6, characterized in that: The pressure regulating chamber also includes a ring plate vibration assembly, which includes: A fixed seat (41), the fixed seat (41) is connected to the pressure regulating chamber, and a column (42) is connected to the center of the fixed seat (41); A disc (43), the disc (43) is concentrically connected to the column (42), and the disc (43) is provided in two and is spaced apart from each other; A rotating seat (44), the rotating seat (44) is rotatably connected to the bottom end of the fixed seat (41); A telescopic member (45), the telescopic member (45) is hinged between the rotating seat (44) and the disc (43), a plurality of telescopic members (45) are evenly arranged along the circumference of the disc (43), the telescopic member (45) is made of a memory alloy material and has a tendency to shorten when the temperature rises; A rotating shaft (46), the rotating shaft (46) is connected to the bottom end of the rotating seat (44); A plurality of vibration blocks (47) are evenly connected to the bottom end of the rotating shaft (46) along the circumferential direction, and the vibration blocks (47) are in contact with the upper surface of the conical ring piece (16).

8. The straight-through retractable anti-scratch thermal mining casing head according to claim 6, characterized in that: A flexible sealing joint assembly is arranged on the upper part of the fixed sealing seat (5), and the flexible sealing joint assembly comprises: A joint seat (21), the joint seat (21) is connected to the inner side of the fixed sealing seat (5), and the top and bottom ends of the joint seat (21) are provided with arc-shaped mounting grooves (23); A sealing joint (22), the sealing joint (22) is installed in the joint seat (21), the top and bottom ends of the sealing joint (22) are provided with arc-shaped mounting surfaces (24), the arc-shaped mounting surfaces (24) are rotatably connected to the arc-shaped mounting groove (23) and cannot be disengaged; a fixing ring (25) is provided inside the sealing joint (22); The sealing ring (26) is connected to the inner wall of the fixing ring (25), the sealing ring (26) is made of elastic material, and the sealing ring (26) is closely connected to the outer wall of the telescopic sealing tube (3).

9. A straight-through retractable anti-scratch thermal mining casing head according to claim 8, characterized in that: The flexible sealing joint assembly also includes: A sleeve (27), the sleeve (27) is connected to the outside of the fixing ring (25); A reset pressure rod (28), the reset pressure rod (28) is slidably connected to the outer end of the sleeve (27), and a spring (29) is connected between the reset pressure rod (28) and the end of the sleeve (27); The elastic support frame (31) is arranged on the upper part of the fixed sealing seat (5), the elastic support frame (31) is arranged in a wave-shaped structure, and the end of the reset pressure rod (28) is crimped to the central depression of the elastic support frame (31); the two ends of the elastic support frame (31) are installed in the clamping seat (32) on the inner wall of the fixed sealing seat (5), the elastic support frame (31) is made of memory alloy material, and the elastic support frame (31) has a tendency to become straight when the temperature rises.

10. A straight-through retractable anti-scratch thermal mining casing head according to claim 9, characterized in that: A sealing reinforcement component is provided in the flexible sealing joint component, and the sealing reinforcement component includes: A first sealing airbag (33), the first sealing airbag (33) is arranged inside the sealing ring (26); A second sealing airbag (34), the second sealing airbag (34) is connected between the arc-shaped mounting surface (24) and the arc-shaped mounting groove (23); An airflow pipeline (35) is arranged in the flexible sealing joint component and is connected to the first sealing airbag (33) and the second sealing airbag (34).

Images