A direct-through telescopic scratch-proof thermal recovery casing head

Abstract

The present invention relates to the technical field of oil drilling wellhead devices, and discloses a direct-through telescopic anti-scratch thermal recovery casing head, which includes: a casing head, with a telescopic sealing tube arranged at the center of the casing head; a coupling, which is connected to the top end of the telescopic sealing tube; a fixed sealing seat, which is arranged between the casing head and the telescopic sealing tube; 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; a pressure control unit, which is used to control the contact pressure between the anti-scratch ring and the telescopic sealing tube. In the present invention, an anti-scratch ring is arranged at the bottom end of the fixed sealing seat to prevent impurities on the telescopic sealing tube from damaging the sealing parts when moving upward; the pressure control unit is used to realize the dynamic adjustment of the contact pressure between the anti-scratch ring and the telescopic sealing tube, while ensuring the anti-scratch effect, reasonably controlling the wear degree of the telescopic sealing tube, prolonging the service life of the telescopic sealing tube and the anti-scratch ring, and reducing the equipment maintenance cost.

Description

Technical Field

[0001] The present invention relates to the technical field of oil drilling wellhead devices. More specifically, the present invention relates to a through-type telescopic anti-scratch thermal recovery casing head. Background Art

[0002] In the field of oil exploitation, especially in the exploitation of heavy oil and super heavy oil, thermal recovery technology has been widely applied. In order to ensure the integrity of the oil well casing during the thermal recovery process and avoid casing damage caused by thermal expansion and contraction, a telescopic thermal recovery casing head is adopted, which allows the casing to expand and contract within a certain range in the axial direction, enabling the casing to freely expand and contract during thermal expansion and contraction without excessive stress due to restraint, thereby extending the service life of the casing.

[0003] In the prior art, for example, the utility model patent with the 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, and the oil layer casing is located in the inner cavity of the surface casing. Among them, the upper end of the oil layer casing is threadedly connected to a through pipe, a sealing disk is installed between the inner wall of the casing head body and the through pipe, an inner sealing ring and a tapered ring are provided inside the sealing disk, the inner sealing ring is located above the tapered ring, a protective sleeve is provided on the outer circle of the upper part of the through pipe, and the through pipe and the protective sleeve are in sliding fit. In this thermal recovery casing head, during the up and down sliding process of the through pipe, these sundries are scraped clean by the tapered ring. In the actual use process, the tapered ring is closely attached to the surface of the through pipe, and certain wear will also be generated on the surface of the through pipe during the scraping process.

[0004] Therefore, it is necessary to propose a through-type telescopic 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 section, which will be further elaborated in detail in the Detailed Description section. The Summary of the Invention section of the present 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 protection scope of the claimed technical solution.

[0006] To at least partially solve the above problems, the present invention provides a through-type telescopic anti-scratch thermal recovery casing head, including:

[0007] A casing head, with a telescopic sealing pipe arranged at the center of the casing head;

[0008] A coupling, connected to the top end of the telescopic sealing pipe;

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

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

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

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

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

[0014] Preferably, the scratch-resistant ring adopts a split structure and includes at least two scratch-resistant ring bodies. The multiple scratch-resistant ring bodies slide relative to each other and form the entire scratch-resistant ring structure around.

[0015] Preferably, a pressure adjustment cavity is arranged at the lower part of the fixed sealing seat. The pressure adjustment cavity includes:

[0016] Hydraulic cylinder, the hydraulic cylinder is horizontally connected in the pressure adjustment cavity of the fixed sealing seat. The output end of the hydraulic cylinder is connected with a hydraulic rod. A guide sleeve is arranged on one side of the pressure adjustment cavity opposite to the hydraulic cylinder. The hydraulic rod is slidably connected in the guide sleeve, and a spring is connected between the end of the hydraulic rod and the inner wall of the guide sleeve;

[0017] Support frame, the support frame is arranged in an L shape. The top end of the support frame is connected with the hydraulic rod, and the bottom end is connected with the scratch-resistant ring. A sliding groove for the scratch-resistant ring to slide is arranged on the fixed sealing seat, and a sealing gasket is connected at the contact position between the fixed sealing seat and the scratch-resistant ring.

[0018] Preferably, a conical ring piece is connected to the bottom end of the fixed sealing seat. The height of the inner ring end of the conical ring piece is higher than that of the outer ring end, and the inner ring end of the conical ring piece is arranged close to the scratch-resistant ring. A drain pipe is connected to the side of the casing head, and the drain pipe is arranged close to the outer ring end of the conical ring piece.

[0019] Preferably, the pressure adjustment cavity further includes a ring piece vibration component. The ring piece vibration component includes:

[0020] Fixed seat, the fixed seat is connected in the pressure adjustment cavity, and a column is connected to the center of the fixed seat;

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

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

[0023] The telescopic member is hinged between the rotating seat and the disc. A plurality of telescopic members are evenly arranged along the circumferential direction of the disc. The telescopic member is made of a shape memory alloy material and has a shortening tendency when the temperature rises;

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

[0025] The vibrating blocks. A plurality of vibrating blocks are evenly connected to the bottom end of the rotating shaft along the circumferential direction. The vibrating blocks contact the upper surface of the conical ring plate.

[0026] Preferably, a flexible seal joint assembly is provided on the upper part of the fixed seal seat. The flexible seal joint assembly includes:

[0027] The joint seat is connected to the inner side of the fixed seal seat. Arc-shaped mounting grooves are provided at the top and bottom ends of the joint seat;

[0028] The seal joint is installed in the joint seat. Arc-shaped mounting surfaces are provided at the top and bottom ends of the seal joint. The arc-shaped mounting surfaces are rotationally connected to the arc-shaped mounting grooves and do not come out; A fixed ring is provided inside the seal joint;

[0029] The seal ring is connected to the inner wall of the fixed ring. The seal ring is made of an elastic material and is fitted and connected to the outer wall of the telescopic seal tube.

[0030] Preferably, the flexible seal joint assembly further includes:

[0031] The sleeve is connected to the outside of the fixed ring;

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

[0033] The elastic support frame is provided on the upper part of the fixed seal seat. The elastic support frame is set as a wavy structure. The end of the reset pressure rod is pressed against the central depression of the elastic support frame; Both ends of the elastic support frame are installed in the clamping seats on the inner wall of the fixed seal seat. The elastic support frame is made of a shape memory alloy material and has a tendency to straighten when the temperature rises.

[0034] Preferably, a seal strengthening assembly is provided inside the flexible seal joint assembly. The seal strengthening assembly includes:

[0035] The first seal airbag is provided inside the seal ring;

[0036] The second seal airbag is connected between the arc-shaped mounting surface and the arc-shaped mounting groove;

[0037] The air flow pipeline is provided inside the flexible seal joint assembly and is connected to communicate the first seal airbag and the second seal airbag.

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

[0039] A through-type telescopic scratch-proof thermal production casing head provided by the present invention is provided with a scratch-proof ring at the bottom end of a fixed seal seat to prevent impurities attached to a telescopic seal tube from damaging the seal of the fixed seal seat when ascending; a pressure control unit is adopted to realize dynamic adjustment of the contact pressure between the scratch-proof ring and the telescopic seal tube, and can reasonably control the wear degree of the telescopic seal tube while ensuring the scratch-proof effect according to the actual working conditions, prolonging the service life of the telescopic seal tube and the scratch-proof ring, and reducing the maintenance cost of the equipment.

[0040] For a through-type telescopic scratch-proof thermal production casing head of the present invention, other advantages, objectives and features of the present invention will be partially reflected by the following description, and will also be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings are used to provide 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 to the present invention. In the drawings:

[0042] Figure 1 is a schematic cross-sectional structure diagram of a through-type telescopic scratch-proof thermal production casing head of the present invention;

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

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

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

[0046] Figure 5 For the present invention Figure 4 is a schematic enlarged partial structure diagram at A (initial state) in the present invention;

[0047] Figure 6 For the present invention Figure 4 is a schematic enlarged partial structure diagram at A (rotating state) in the present invention;

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

[0049] Figure 8 is a schematic internal structure diagram of a ring plate vibration assembly 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 mounting groove; 24. arc 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 implementation manners

[0051] The following further elaborates on the present invention in conjunction with the attached drawings and embodiments, enabling those skilled in the art to implement it based on the description in the specification.

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

[0053] Embodiment 1:

[0054] As Figures 1 - 3 shown, the present invention provides a direct-through telescopic anti-scratch thermal recovery casing head, comprising:

[0055] A casing head 4, with a telescopic sealing tube 3 provided at the center of the casing head 4;

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

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

[0058] An anti-scratch ring 6, 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, 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 as follows:

[0062] The present invention provides a straight-through, retractable, scratch-resistant thermal recovery casing head. A retractable sealing tube 3 is disposed in the center of a casing head 4, forming an annulus. The top end of the retractable sealing tube 3 is connected to a coupling 1, and a fixed sealing seat 5 is disposed at the bottom end of the coupling 1 to seal the annulus. An anti-scratch ring 6 is disposed at the bottom end of the fixed sealing seat 5. During use, the retractable sealing tube 3 moves upward under the influence of high temperatures, driving the coupling 1 upward. The retractable sealing tube 3 slides relative to the anti-scratch ring 6, which scrapes impurities from the outer wall of the retractable sealing tube 3, preventing them from damaging the seal of the fixed sealing seat 5 as they move upward. After use, the temperature drops, causing the retractable sealing tube 3 to slide downward, returning to a preset position. A pressure sensor is provided on the anti-scratch ring 6, which detects the real-time contact pressure between the anti-scratch ring 6 and the retractable sealing tube 3. A pressure control unit regulates the pressure between the anti-scratch ring 6 and the retractable sealing tube 3, keeping the contact pressure within a preset range. This control, while ensuring that the anti-scratch ring 6 effectively blocks debris, limits the degree of wear on the retractable sealing tube 3 by the anti-scratch ring 6.

[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] Example 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 sleeve 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, 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 circle 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 due to heat; 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] Example 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 bodies. The multiple anti-scratch ring 6 bodies slide relative to each other and form the entire anti-scratch ring 6 structure by surrounding.

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

[0071] The anti-scratch ring 6 adopts a split structure. When the telescopic sealing tube 3 has a certain degree of irregularity on the surface under the action of high temperature and high pressure or during long-term operation and wear, each ring body can slide relative to each other, respectively adjust the position and angle, so as to better fit the surface of the telescopic sealing tube 3; effectively improve the stability of the anti-scratch effect, and ensure that sundries can be reliably blocked in various situations to protect the sealed area.

[0072] Embodiment 4:

[0073] As Figure 3 shown, on the basis of the above-mentioned Embodiment 3, a pressure regulating cavity is provided at the lower part of the fixed seal seat 5. The pressure regulating cavity includes:

[0074] A hydraulic cylinder 11, the hydraulic cylinder 11 is horizontally connected in the pressure regulating cavity of the fixed seal seat 5. The output end of the hydraulic cylinder 11 is connected with a hydraulic rod 12. A guide sleeve 13 is provided on one side of the pressure regulating cavity opposite to the hydraulic cylinder 11; the hydraulic rod 12 is slidably connected in 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] A support frame 15, the support frame 15 is set to be L-shaped. The top end of the support frame 15 is connected with the hydraulic rod 12, and the bottom end is connected with the anti-scratch ring 6; a sliding groove for the anti-scratch ring 6 to slide is provided on the fixed seal seat 5, and a sealing gasket is connected at the contact position between the fixed seal seat 5 and the anti-scratch ring 6.

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

[0077] A pressure sensor is provided on the anti-scratch ring 6. The real-time contact pressure between the anti-scratch ring 6 and the telescopic sealing tube 3 is detected through 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 cannot effectively block the sundries attached to the telescopic sealing tube 3. At this time, the hydraulic cylinder 11 is started to extend, the hydraulic rod 12 drives the support frame 15 to move forward, and the anti-scratch ring 6 moves towards 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 relatively large, the wear degree of the telescopic sealing tube 3 is relatively 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, the hydraulic rod 12 drives the support frame 15 to move in the reverse direction, and the anti-scratch ring 6 moves away from the telescopic sealing tube 3 until the contact pressure is within the preset range.

[0078] A safety limit groove can be provided on the telescopic sealing tube 3. When the position sensor detects that the pressure at the end of the stop screw 8 exceeds the preset value, it indicates that there is a risk of shearing the stop screw 8. Then, the hydraulic cylinder 11 is activated to extend the hydraulic rod 12, increasing the pressure between the anti-scratch ring 6 and the telescopic sealing tube 3, thereby increasing the resistance to the movement of the telescopic sealing tube 3 until the anti-scratch ring 6 is clamped into the safety limit groove, preventing the telescopic sealing tube 3 from moving further; when the telescopic sealing tube 3 pops out due to high temperature, the anti-scratch ring 6 acts to delay the process of the telescopic sealing tube 3 popping out and locks the telescopic sealing tube 3 through the safety limit groove, avoiding injury to personnel after the telescopic sealing tube 3 pops out.

[0079] Embodiment 5:

[0080] As Figure 2 、 Figure 3 shown, on the basis of the above Embodiment 4, a conical ring piece 16 is connected to the bottom end of the fixed sealing seat 5. The height of the inner ring end of the conical ring piece 16 is higher than that of 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 drain pipe is connected to the side of the coupling 1, and the drain 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 as follows:

[0082] A conical ring piece 16 is provided at the bottom end of the fixed sealing seat 5. The impurities on the surface of the telescopic sealing tube 3 are scraped off by the anti-scratch ring 6. After being scraped off, the impurities fall down 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 that the resistance to the movement of the telescopic sealing tube 3 increases due to the accumulation of impurities at the anti-scratch ring 6.

[0083] Embodiment 6:

[0084] As Figure 3 、 Figure 7 、 Figure 8 shown, on the basis of the above Embodiment 5, the pressure regulating cavity further includes a ring piece vibration component, and the ring piece vibration component includes:

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

[0086] A disc 43, the disc 43 is concentrically connected to the column 42, and two discs 43 are arranged at an interval up and down;

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

[0088] 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 circumferential direction of the disc 43. The telescopic member 45 is made of shape memory alloy material and has a shortening tendency when the temperature rises.

[0089] The rotating shaft 46 is connected to the bottom end of the rotating seat 44.

[0090] A plurality of vibration blocks 47 are evenly connected to the bottom end of the rotating shaft 46 along the circumferential direction. The vibration blocks 47 contact the upper surface of the conical ring piece 16.

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

[0092] When the thermal production casing head is used in a high-temperature environment, the ring piece vibration assembly will be automatically activated. The telescopic member 45 of the ring piece vibration assembly is made of shape memory alloy material, and the bending will intensify and the length will decrease as the temperature rises. In the initial state, both ends of the telescopic member 45 are hinged to the rotating seat 44 and the disc 43 respectively, 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 end of the rotating seat 44 rotates accordingly, so that a plurality of vibration blocks 47 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 recovers and the length increases, the rotating shaft 46 rotates in the reverse direction, and the vibration blocks 47 knock and collide with the conical ring piece 16 again. Through the above structural design, the ring piece vibration assembly is automatically activated when the thermal production casing head is used. While the anti-scratch ring 6 cleans the telescopic seal pipe 3, the conical ring piece 16 is knocked to vibrate, so that the attached impurities and deposits on the conical ring piece 16 fall back, ensuring the cleaning effect of the impurities on the telescopic seal pipe 3.

[0093] Embodiment 7:

[0094] As Figures 3 - 6 shown, on the basis of the above Embodiment 5, a flexible seal joint assembly is provided on the upper part of the fixed seal seat 5. The flexible seal joint assembly includes:

[0095] The joint seat 21 is connected to the inner side of the fixed seal seat 5. Arc-shaped mounting grooves 23 are provided at the top and bottom ends of the joint seat 21.

[0096] The seal joint 22 is installed in the joint seat 21. Arc-shaped mounting surfaces 24 are provided at the top and bottom ends of the seal joint 22. The arc-shaped mounting surfaces 24 are rotatably connected to the arc-shaped mounting grooves 23 and do not come out. A fixed ring 25 is provided inside the seal joint 22.

[0097] The seal ring 26 is connected to the inner wall of the fixed ring 25. The seal ring 26 is made of elastic material, and the seal ring 26 is fitted and connected to the outer wall of the telescopic seal pipe 3.

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

[0099] When the telescopic seal tube 3 is in use and moves up and down frequently in a high-temperature environment, local structural deformation and bending may occur. With the separate sealing ring sealing form, the sealing state in the above local area is not good, and even the sealing ring may be separated from the telescopic seal tube 3, resulting in sealing failure. Therefore, a flexible seal joint assembly is provided on the fixed seal seat 5. When the telescopic seal tube 3 undergoes structural deformation and bending during operation, it will drive the sealing ring 26 in contact with it to move, and the seal joint 22 will rotate in the joint seat 21 along with the movement of the sealing ring 26, so as to adapt to the deformation and bending state of the telescopic seal tube 3; the seal joint 22 is installed in the joint seat 21, and the arc-shaped mounting surface 24 of the seal joint 22 rotates in the arc-shaped mounting groove 23, ensuring that the seal joint 22 can rotate flexibly without slipping out of the fixed seal seat 5.

[0100] Through the above structural design, the rotation design of the seal joint 22 in the joint seat 21 enables the entire flexible seal joint assembly to flexibly adjust its own angle following the deformation and bending state of the telescopic seal tube 3, keeping the sealing ring 26 in close contact with the outer wall of the telescopic seal tube 3, preventing internal medium leakage, effectively reducing the influence of the structural deformation of the telescopic seal tube 3 on the sealing structure, and improving the sealing reliability of the thermal recovery casing head.

[0101] Example 8:

[0102] As Figures 3 - 6 shown, on the basis of the above Example 7, the flexible seal joint assembly further includes:

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

[0104] A reset pressure rod 28, which 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;

[0105] An elastic support frame 31, which is arranged on the upper part of the fixed seal seat 5. The elastic support frame 31 is arranged in a wavy structure, and the end of the reset pressure rod 28 is pressed against the central depression of the elastic support frame 31; both ends of the elastic support frame 31 are installed in the clamping seats 32 on the inner wall of the fixed seal seat 5. The elastic support frame 31 is made of a shape memory alloy material, and has a tendency to straighten when the temperature rises.

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

[0107] When the flexible seal joint assembly is in use, the reset pressure rod 28 in the sleeve 27 abuts against the depression at the center of the elastic support frame 31 under the extrusion of the spring 29. When the seal joint 22 rotates, it drives the sleeve 27 and the reset pressure rod 28 to rotate. Under the combined action of the spring 29 and the elastic support frame 31, the seal joint 22 always maintains a tendency to reset to the initial position, which has a certain corrective effect on the bending deformation of the telescopic seal tube 3. The elastic support frame 31 is made of shape memory alloy material. When the thermal recovery casing head works at a 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, improving the auxiliary reset effect at high temperature.

[0108] Embodiment 9:

[0109] As Figures 3 - 6 shown, on the basis of the above Embodiment 7, a seal strengthening assembly is provided inside the flexible seal joint assembly. The seal strengthening assembly includes:

[0110] The first seal airbag 33 is arranged inside the seal ring 26;

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

[0112] The air flow pipeline 35 is arranged inside the flexible seal joint assembly and is connected to the first seal airbag 33 and the second seal airbag 34.

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

[0114] The telescopic seal tube 3 slides along the center of the flexible seal joint assembly. By providing the first seal airbag 33, the seal ring 26 has a certain deformation range, enabling it to closely fit the telescopic seal tube 3 and improving the sealing effect. The telescopic seal tube 3 presses the seal ring 26 and simultaneously applies pressure to the first seal airbag 33 inside the seal ring 26. The air flow enters the second seal airbag 34 through the air flow pipeline 35, and the second seal airbag 34 expands between the arc-shaped mounting surface 24 and the arc-shaped mounting groove 23 to fill the possible gap between them, strengthening the sealing performance between the seal joint 22 and the joint seat 21. Through the setting of the first seal airbag 33 and the second seal airbag 34, two sets of sealing structures are formed between the telescopic seal tube 3 and the fixed seal seat 5, and between the arc-shaped mounting surface 24 and the arc-shaped mounting groove 23, and both can closely fit the structure, avoiding the situation of seal failure caused by the deformation of the telescopic seal tube 3 and frequent use when only using the seal ring 26; the sealing structure between the arc-shaped mounting surface 24 and the arc-shaped mounting groove 23 does not directly contact the telescopic seal tube 3 and is less affected by the deformation of the telescopic seal tube 3, and the sealing reliability is higher.

[0115] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0116] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communicable with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the connection inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, 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 above, they are not limited to only the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the examples shown and described herein.

Claims

1. A straight-through retractable scratch-resistant thermal recovery casing head, characterized in that: include: A casing head (4), wherein a telescopic sealing tube (3) is provided 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) is slidably connected to the bottom end of the fixed sealing seat (5), and an inner ring end of the anti-scratch ring (6) contacts the surface of the telescopic sealing tube (3). A pressure sensor is provided on the anti-scratch ring (6) for collecting real-time contact pressure between the anti-scratch ring (6) and the telescopic sealing tube (3); A pressure control unit, the pressure control unit is used to control the contact pressure between the anti-scratch ring (6) and the telescopic sealing tube (3); A pressure regulating chamber is provided at the lower portion 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), and the output end of the hydraulic cylinder (11) is connected to a hydraulic rod (12); The support frame (15) has a top end connected to the hydraulic rod (12) and a bottom end connected to the anti-scratch ring (6).

2. A straight-through retractable scratch-resistant thermal recovery 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 engaged with the limiting groove (9), and a position sensor is provided on the end of the stop screw (8).

3. The straight-through retractable scratch-resistant thermal recovery casing head according to claim 1, 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.

4. The straight-through retractable scratch-resistant thermal recovery casing head according to claim 1, characterized in that: A guide sleeve (13) is provided on the side of the pressure regulating chamber facing the hydraulic cylinder (11); the hydraulic rod (12) is slidably connected in 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 set to be L-shaped, 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).

5. The straight-through retractable scratch-resistant thermal recovery casing head according to claim 4, 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-scraping ring (6); the side of the sleeve head (4) is connected to a drain pipe, and the drain pipe is arranged close to the outer ring end of the conical ring piece (16).

6. The straight-through retractable scratch-resistant thermal recovery casing head according to claim 5, characterized in that: The pressure regulating chamber also includes a ring plate vibration component, 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); The disc (43) is concentrically connected to the column (42), and the disc (43) is provided in two and spaced apart from each other; A rotating seat (44) is rotatably connected to the bottom end of the fixed seat (41); A telescopic member (45) is hinged between the rotating seat (44) and the disc (43), and 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 base (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).

7. The straight-through retractable scratch-resistant thermal recovery casing head according to claim 5, characterized in that: A flexible sealing joint assembly is provided on the upper portion 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) 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).

8. The straight-through retractable scratch-resistant thermal recovery casing head according to claim 7, characterized in that: The flexible sealing joint assembly also includes: A sleeve (27) connected to the outside of the fixing ring (25); A 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 to have a wave-shaped structure, and the end of the reset pressure rod (28) is pressed into 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.

9. The straight-through retractable scratch-resistant thermal recovery casing head according to claim 8, 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); The 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).

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