Clamping type packing device

Abstract

The invention relates to the technical field of packers, in particular to a clamping type packing device which comprises a mounting part, a clamping part and a sealing part. A pushing groove capable of axially shrinking is formed in the periphery of the mounting part; the clamping part is movably arranged in the pushing groove; a swing arm is rotationally arranged on the clamping part; the sealing part is arranged in the pushing groove, and one end of the sealing part is movably connected with the pushing groove; a sealing ring is arranged between the two ends of the sealing part, and when the pushing groove contracts, the movable end of the sealing part can be pushed to move till the sealing ring abuts against the inner wall of the to-be-packed casing pipe. Through the contraction movement of the pushing groove, the swing arm can be driven to be connected with the coupling position of the casing pipe to be packed in a clamped mode, and meanwhile the middle of the sealing ring can be driven to abut against the inner wall of the casing pipe to be packed. According to the sleeve packer, the original meshing positioning mode is replaced, the sleeve to be packed is prevented from being deformed while the sealing and packing effect is guaranteed, the setting effect and the setting stability are guaranteed, and the conditions of slippage and movement are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of packers, and in particular relates to a clamping type packer. Background Art

[0002] The packer is one of the important temporary sealing tools for realizing multi-stage fracturing. By lowering and sealing the packer at a preset position in the wellbore, the casing in the wellbore can be segmented and isolated, thus ensuring the effective construction of segmented fracturing.

[0003] Existing packers generally achieve sealing through soluble rubber tubes, and after the slips are attached to the casing, under the axial force of the downhole sealing tool, the anchor teeth and the casing are engaged and positioned. During the outward expansion of the slips, the high-strength anchor teeth will bite into the inner wall of the casing to achieve the anchoring of the temporary plugging tool. After the rubber tube is squeezed and deformed, it will be close to the inner wall of the casing and locked. However, when the casing is deformed, the expansion amplitude of each petal of the slip will be inconsistent, resulting in uneven anchoring, or the depth of the anchor teeth biting into the inner wall of the casing will be inconsistent or insufficient, which is very likely to cause the packer to slip and move after setting, thereby causing the setting failure and affecting the fracturing construction. At the same time, in order to ensure the effectiveness of the setting, the anchor teeth need to bite into the inner wall of the casing to a certain depth. However, when the anchor teeth bite into the inner wall of the casing to a certain depth, it is very easy to cause local damage to the inner wall of the casing, which reduces the strength of the casing. This cycle is repeated, which further aggravates the deformation of the casing.

[0004] Therefore, the existing packer can easily cause casing deformation, thereby affecting the setting effect. Summary of the invention

[0005] In view of the above problems, the present invention proposes a snap-on sealing device, comprising:

[0006] A mounting portion, the mounting portion being arranged along the axial direction of the casing to be sealed;

[0007] A pushing groove is provided on the outer periphery of the mounting portion, and the pushing groove can be contracted along the axial direction of the mounting portion;

[0008] A clamping portion, the clamping portion being movably disposed in the pushing groove;

[0009] A swing arm is rotatably provided on the clamping portion, and when the pushing groove contracts, the clamping portion can be pushed and one end of the swing arm can be driven to move in a direction away from the mounting portion;

[0010] A sealing portion, the sealing portion is disposed in the pushing groove around the circumference of the mounting portion, and one end of the sealing portion is movably connected to the pushing groove;

[0011] The movable end of the sealing portion is arranged toward the clamping portion;

[0012] A sealing ring is provided between the two ends of the sealing part. When the pushing groove contracts, it can push the movable end of the sealing part to move, so that the middle part of the sealing ring expands and deforms outward until it abuts against the inner wall of the casing to be sealed.

[0013] In some specific embodiments, the mounting portion includes:

[0014] Mandrel;

[0015] A central tube, wherein the central tube is movably disposed on the outer periphery of the core shaft along the axial direction of the core shaft;

[0016] A joint, which is detachably arranged on the outer periphery of the core shaft along the axial direction of the core shaft, and is arranged directly opposite to one end of the central tube;

[0017] The inner wall of the joint near the end of the central tube and the outer wall of the core shaft are combined to form a plug-in cavity, and the plug-in cavity is adapted to the end of the central tube near the joint;

[0018] One end of the center tube away from the joint is a bent section bent in a direction away from the core shaft, and the center tube and the end surface of the joint are combined through the bent section to form the pushing groove.

[0019] In some specific embodiments, a cylinder is coaxially disposed outside the core shaft, one end of the cylinder is connected to the bending section, and the center tube can be driven to move along the axial direction of the core shaft toward the joint through the cylinder.

[0020] In some specific embodiments, there are multiple clamping parts, and the multiple clamping parts are evenly arranged along the circumference of the central tube.

[0021] In some specific embodiments, the clamping portion includes:

[0022] An articulated frame, wherein the articulated frame is slidably disposed on the outer wall of the central tube along the axial direction of the central tube, and the swing arm is hingedly disposed on one side of the articulated frame;

[0023] A first guide sleeve, wherein the first guide sleeve is slidably disposed on the outer wall of the center tube along the axial direction of the center tube, and one end of the first guide sleeve is disposed toward the swing arm, and one end of the first guide sleeve close to the swing arm and one end of the swing arm close to the first guide sleeve are adapted to and abut against each other.

[0024] In some specific embodiments, the clamping portion further includes:

[0025] A second guide sleeve, the second guide sleeve is slidably disposed on the outer wall of the central tube along the axial direction of the central tube;

[0026] There are two swing arms, and the two swing arms are arranged on both sides of the articulated frame along the axial direction of the central tube;

[0027] The first guide sleeve and the second guide sleeve are arranged in one-to-one correspondence with the two swing arms.

[0028] In some specific embodiments, the first guide sleeve comprises:

[0029] A first sliding block and a second sliding block, wherein the first sliding block and the second sliding block are slidably disposed on the outer wall of the central tube along the axial direction of the central tube;

[0030] The first sliding block abuts against the joint;

[0031] A spring is arranged between the first sliding block and the second sliding block, and the second sliding block and the swing arm are adapted to and abut against each other.

[0032] In some specific embodiments, the sealing portion includes:

[0033] Support rings, there are two support rings, one of which is fixedly sleeved on the outer wall of the end of the center tube away from the joint, and the other support ring is slidably sleeved on the outer wall of the center tube along the axial direction of the center tube;

[0034] Two ends of the sealing ring are respectively connected to the two supporting rings.

[0035] In some specific embodiments, a sealing ring is provided around the circumference of the central pipe in the middle of the sealing ring away from the support ring, for abutting against the inner wall of the casing to be sealed when the middle of the sealing ring expands and deforms outward.

[0036] In some specific embodiments, an anti-reverse thread is provided on the outer wall of the central tube along the axial direction of the central tube for threaded engagement with the engaging portion and the sealing portion.

[0037] The clamping type sealing device of the present invention can push and drive the swing arm of the clamping part arranged in the pushing groove to move away from the mounting part to the outside of the pushing groove through the contraction movement of the pushing groove of the mounting part, so as to clamp with the coupling of the casing to be sealed, and at the same time, it can also push and drive the middle part of the sealing ring of the sealing part arranged in the pushing groove around the mounting part to extend outward in the direction away from the mounting part until it abuts against the inner wall of the casing to be sealed, so as to achieve sealing. It replaces the original positioning method of biting the anchor teeth and the casing to be sealed, while ensuring the sealing effect, it avoids the deformation of the casing to be sealed, ensures the setting effect, improves the setting stability, and avoids the slippage and movement of the clamping type sealing device.

[0038] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A cross-sectional view of a snap-on isolation device in an embodiment of the present invention is shown;

[0041] Figure 2 A cross-sectional view showing the beginning of positioning and sealing of the snap-fit ​​sealing device in an embodiment of the present invention;

[0042] Figure 3 A cross-sectional view showing the completion of positioning and sealing of the snap-fit ​​sealing device in the embodiment of the present invention is shown;

[0043] Figure 4 A cross-sectional view of an articulated frame in an embodiment of the present invention is shown;

[0044] Figure 5a A front view of an articulated frame in an embodiment of the present invention is shown;

[0045] Figure 5b A side view of an articulated frame in an embodiment of the present invention is shown;

[0046] Figure 6a A cross-sectional view of a joint in an embodiment of the present invention is shown;

[0047] Figure 6bA left side view of a joint in an embodiment of the present invention is shown;

[0048] Figure 7a A cross-sectional view of a central tube in an embodiment of the present invention is shown;

[0049] Figure 7b A left side view of a central tube in an embodiment of the present invention is shown.

[0050] In the figure, 100, mounting portion; 110, core shaft; 120, joint; 121, threaded hole; 130, center tube; 131, bending section; 140, cylinder; 200, clamping portion; 210, hinge frame; 211, hinge groove; 220, swing arm; 230, first guide sleeve; 231, first sliding block; 2311, first positioning ring; 232, second sliding block; 2321, second positioning ring; 233, spring; 240, second guide sleeve; 241, third positioning ring; 300, sealing portion; 310, support ring; 320, sealing ring; 330, sealing ring; 400, casing to be sealed; 410, coupling; 500, sealing ball. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0052] Reference Figure 1 The present invention provides a clamping type sealing device, comprising: a mounting part 100, a clamping part 200 and a sealing part 300. The mounting part 100 is arranged along the axial direction of the casing 400 to be sealed. A pushing groove is provided on the outer circumference of the mounting part 100, and the pushing groove can shrink along the axial direction of the mounting part 100. The clamping part 200 is movably arranged in the pushing groove. A swing arm 220 is rotatably arranged on the clamping part 200, and when the pushing groove shrinks, the clamping part 200 can be pushed and one end of the swing arm 220 can be driven to move in a direction away from the mounting part 100. The sealing part 300 is arranged in the pushing groove around the circumference of the mounting part 100, and one end of the sealing part 300 is movably connected to the pushing groove. A sealing ring 320 is arranged between the two ends of the sealing part 300, and when the pushing groove shrinks, the movable end of the sealing part 300 can be pushed and the middle part of the sealing ring 320 can be driven to extend outward to abut against the inner wall of the casing 400 to be sealed.

[0053] Specifically, the mounting portion 100 is arranged along the axial direction of the casing 400 to be sealed, and the push groove on the outer periphery of the mounting portion 100 is opened along the axial direction of the casing 400 to be sealed, wherein the push groove can shrink along the axial direction of the push groove, i.e., the axial direction of the casing 400 to be sealed, that is, the distance between the inner walls at both ends of the push groove in the axial direction can be continuously reduced. The clamping portion 200 is arranged in the push groove, and the clamping portion 200 can move along the axial direction of the push groove. A swing arm 220 is rotatably arranged on the clamping portion 200, and one end of the swing arm 220 away from the clamping portion 200 extends along the axial direction of the push groove, referring to Figure 2 When the distance between the inner walls at both ends of the push groove in the axial direction is reduced, the end of the swing arm 220 away from the clamping portion 200 can be pushed, thereby driving the end of the swing arm 220 away from the clamping portion 200 to move to the outside of the push groove in a direction away from the mounting portion 100, so that it can be clamped with the coupling 410 of the casing 400 to be sealed, thereby completing the positioning setting. At the same time, the sealing portion 300 is arranged in the push groove around the circumference of the mounting portion 100, and the end of the sealing portion 300 away from the clamping portion 200 is fixedly arranged in the push groove, and the end of the sealing portion 300 close to the clamping portion 200 can be moved in the push groove along the axial direction of the push groove. The movable end of the sealing portion 300 is arranged toward the clamping portion 200, and there is a gap between the two ends of the sealing portion 300. Figure 2 When the spacing between the inner walls at both ends of the pushing groove in the axial direction is reduced, while pushing the swing arm 220, the clamping part 200 can be driven to move along the axial direction of the pushing groove, and then the movable end of the sealing part 300 can be indirectly pushed through the clamping part 200, driving the movable end of the sealing part 300 to move along the axial direction of the pushing groove toward the other end of the sealing part 300, wherein a sealing ring 320 is arranged between the two ends of the sealing part 300 around the circumference of the mounting part 100, when the movable end of the sealing part 300 moves along the axial direction of the pushing groove toward the other end of the sealing part 300, the sealing ring 320 arranged between the two ends of the sealing part 300 will be compressed, so that the two axial ends of the sealing ring 320 gradually approach each other, and at the same time, the middle part of the sealing ring 320 will be lifted up, so that the middle part of the sealing ring 320 extends outward along the radial direction of the mounting part 100 in the direction away from the mounting part 100 until it abuts against the inner wall of the casing 400 to be sealed, thereby achieving sealing. It replaces the original positioning method of engaging the anchor teeth with the casing 400 to be sealed, while ensuring the sealing effect, avoiding the deformation of the casing 400 to be sealed, ensuring the sealing effect, improving the sealing stability, and avoiding the slippage and movement of the snap-on sealing device.

[0054] In some specific embodiments of the present invention, referring to Figure 1The mounting portion 100 includes: a core shaft 110, a center tube 130 and a joint 120. The center tube 130 is movably arranged on the outer periphery of the core shaft 110 along the axial direction of the core shaft 110. The joint 120 is detachably arranged on the outer periphery of the core shaft 110 along the axial direction of the core shaft 110, and the joint 120 is arranged opposite to one end of the center tube 130. The inner wall of the end of the joint 120 close to the center tube 130 and the outer wall of the core shaft 110 are combined to form a plug-in cavity, and the plug-in cavity is adapted to the end of the center tube 130 close to the joint 120. The end of the center tube 130 away from the joint 120 is a bending section 131 bent in the direction away from the core shaft 110, and the center tube 130 and the end face of the joint 120 are combined to form a push groove through the bending section 131.

[0055] Specifically, the mandrel 110 is arranged along the axial direction of the casing 400 to be sealed, the joint 120 is detachably sleeved on the outer periphery of the end of the mandrel 110, and the center tube 130 is movably sleeved on the outer periphery of the mandrel 110, so that the center tube 130 can move along the axial direction of the mandrel 110 toward the direction close to the joint 120, wherein, with reference to Figure 7a The end of the center tube 130 away from the joint 120 in the axial direction of the core shaft 110 is a bent section 131 bent in the direction away from the core shaft 110, so that the end of the bent section 131 away from the core shaft 110 can be arranged toward the inner wall of the casing 400 to be sealed, and a pushing groove is enclosed by the end surface of the side of the bent section 131 close to the joint 120, the side of the unbent part of the center tube 130 away from the core shaft 110, and the side of the joint 120 close to the bent section 131. Among them, the inner wall of the end of the joint 120 close to the center tube 130 is a hollow structure, so that the inner wall of the end of the joint 120 close to the center tube 130 and the outer wall of the core shaft 110 are combined to form an insertion cavity, and the shape and size of the insertion cavity are adapted to the shape and size of the end of the center tube 130 close to the joint 120. The end of the center tube 130 close to the joint 120 can be movably inserted in the insertion cavity. In the process, the end of the center tube 130 close to the joint 120 moves along the axial direction of the core shaft 110 toward the bottom of the insertion cavity until the end face of the end of the center tube 130 close to the joint 120 abuts against the bottom of the insertion cavity. The distance between the side of the bending section 131 close to the joint 120 and the side of the end face of the joint 120 close to the bending section 131 will continue to decrease, thereby realizing the contraction of the push groove in the axial direction.

[0056] Further, refer to Figure 6a The outer wall of the end of the joint 120 away from the central tube 130 is tapered, and a plurality of threaded holes 121 are provided. Figure 6b The plurality of threaded holes 121 are evenly arranged around the circumference of the mandrel 110, and a plurality of blind holes are provided at one end of the mandrel 110 close to the joint 120. Figure 7bA plurality of blind holes and a plurality of threaded holes 121 are arranged one by one in correspondence, and each corresponding threaded hole 121 and the blind hole are connected by a pin, which is convenient for installation and disassembly.

[0057] Furthermore, the inner wall of the end of the joint 120 close to the central tube 130 is a stepped structure, referring to Figure 7a The outer wall of one end of the center tube 130 close to the joint 120 is also a step structure, so that after the end of the center tube 130 close to the joint 120 is inserted into the plug-in cavity, it can abut against the inner wall of one end of the joint 120 close to the center tube 130 to ensure stability.

[0058] Furthermore, the inner wall of the end of the center tube 130 away from the joint 120 is tapered, and the outer periphery of the mandrel 110 is a step structure, and the junction of the step structure is also tapered to match the inner wall of the end of the center tube 130 away from the joint 120, so that the center tube 130 can be prevented from moving in the opposite direction by the step structure of the mandrel 110. At the same time, the tapered inner wall of the end of the center tube 130 away from the joint 120 can also facilitate the placement and positioning of the setting ball 500, so as to facilitate sealing.

[0059] In some specific embodiments of the present invention, referring to Figure 1 A cylinder 140 is coaxially arranged on the outside of the core shaft 110, and one end of the cylinder 140 is connected to the side of the bending section 131 away from the joint 120. The movement of the cylinder 140 can drive the center tube 130 to move along the axial direction of the core shaft 110 toward the joint 120, thereby realizing the contraction of the push groove in the axial direction.

[0060] Furthermore, a recessed groove is opened in the circumference of the core shaft 110 on one side of the bending section 131 away from the joint 120 at one end away from the center tube 130, and one end of the cylinder 140 can be abutted against the inner wall of the recessed groove, so that the bending section 131 can be inserted into the interior of the cylinder 140 through the recessed groove, thereby ensuring the connection stability between the cylinder 140 and the bending section 131, and making the contraction process in the axial direction of the push groove more stable.

[0061] In some specific embodiments of the present invention, referring to Figure 4There are multiple clamping parts 200, and the multiple clamping parts 200 are evenly arranged along the circumference of the central tube 130. When the distance between the side of the bending section 131 close to the joint 120 and the end face of the joint 120 close to the bending section 131 is reduced, the end of the swing arm 220 of each clamping part 200 away from the corresponding clamping part 200 can be pushed at the same time, thereby driving the ends of the swing arms 220 of the multiple clamping parts 200 away from the clamping part 200 to move to the outside of the pushing groove in a direction away from the central tube 130, so that they can be clamped with the coupling 410 of the casing 400 to be sealed at the same time, thereby completing the positioning setting. Multiple clamping parts 200 are provided, so that the stability of positioning can be improved through the swing arms 220 of the multiple clamping parts 200.

[0062] Furthermore, the multiple clamping parts 200 are connected to each other, so that the multiple clamping parts 200 can move simultaneously, and the synchronization of the rotation of the swing arm 220 is ensured, thereby improving the stability of the positioning process.

[0063] In some specific embodiments of the present invention, referring to Figure 1 The clamping part 200 includes: an articulated frame 210 and a first guide sleeve 230. The articulated frame 210 is slidably disposed on the outer wall of the central tube 130 along the axial direction of the central tube 130, and the swing arm 220 is hingedly disposed on one side of the articulated frame 210. The first guide sleeve 230 is slidably disposed on the outer wall of the central tube 130 along the axial direction of the central tube 130, one end of the first guide sleeve 230 is disposed toward the swing arm 220, and one end of the first guide sleeve 230 close to the swing arm 220 is mutually adapted and abutted with one end of the swing arm 220 close to the first guide sleeve 230.

[0064] Specifically, the articulated frame 210 is slidably arranged on the outer wall of the center tube 130 along the axial direction of the center tube 130, the swing arm 220 is arranged on one side of the articulated frame 210 in the axial direction of the center tube 130, and one end of the swing arm 220 is hingedly connected to the articulated frame 210 so that the swing arm 220 can rotate through the articulated frame 210, and the other end of the swing arm 220 extends along the axial direction of the center tube 130, the first guide sleeve 230 is slidably arranged on the outer wall of the center tube 130 along the axial direction of the center tube 130, and one end of the first guide sleeve 230 is arranged toward the end of the swing arm 220 away from the articulated frame 210, and the end of the first guide sleeve 230 close to the swing arm 220 and the end of the swing arm 220 close to the first guide sleeve 230 are adapted and abutted against each other. When the distance between the side of the bending section 131 close to the joint 120 and the end face of the side of the joint 120 close to the bending section 131 is reduced, the articulated frame 210 and the first guide sleeve 230 will approach each other under the restriction of the side of the bending section 131 close to the joint 120 and the end face of the side of the joint 120 close to the bending section 131, so that the end of the first guide sleeve 230 close to the swing arm 220 and the end of the swing arm 220 close to the first guide sleeve 230 exert a force on each other. Because the swing arm 220 is rotatable, the end of the swing arm 220 close to the first guide sleeve 230 will be pushed by the first guide sleeve 230 and move in the direction away from the center pipe 130 to the outside of the pushing groove, so that it can be clamped with the coupling 410 of the casing 400 to be sealed.

[0065] In some specific embodiments of the present invention, referring to Figure 1 The clamping part 200 further includes: a second guide sleeve 240. The second guide sleeve 240 is slidably disposed on the outer wall of the central tube 130 along the axial direction of the central tube 130. There are two swing arms 220, and the two swing arms 220 are disposed on both sides of the hinge frame 210 along the axial direction of the central tube 130. The first guide sleeve 230 and the second guide sleeve 240 are disposed one by one corresponding to the two swing arms 220.

[0066] Specifically, there are two swing arms 220, which are symmetrically arranged on the articulated frame 210 along the axial direction of the central tube 130, wherein one swing arm 220 is hingedly arranged on a side of the articulated frame 210 close to the joint 120, and the other swing arm 220 is hingedly arranged on a side of the articulated frame 210 far from the joint 120. The first guide sleeve 230 and the second guide sleeve 240 are both slidably arranged on the outer wall of the central tube 130 along the axial direction of the central tube 130, the first guide sleeve 230 is arranged corresponding to the swing arm 220 arranged close to the joint 120, and the second guide sleeve 240 is arranged corresponding to the swing arm 220 arranged far from the joint 120. When the distance between the side of the bending section 131 close to the joint 120 and the end surface of the joint 120 close to the bending section 131 is reduced, the articulated frame 210, the first guide sleeve 230 and the second guide sleeve 240 will approach each other under the restriction of the side of the bending section 131 close to the joint 120 and the end surface of the joint 120 close to the bending section 131, so that the first guide sleeve 230 and the swing arm 220 disposed close to the joint 120 exert a force on each other, and the second guide sleeve 240 and the swing arm 220 disposed away from the joint 120 exert a force on each other. 20 exert forces on each other. Since the swing arm 220 is rotatable, the end of the swing arm 220 arranged near the joint 120, which is close to the first guide sleeve 230, will be pushed by the first guide sleeve 230 and move to the outside of the push groove in the direction away from the center pipe 130. The end of the swing arm 220 arranged far from the joint 120, which is close to the second guide sleeve 240, will be pushed by the second guide sleeve 240 and move to the outside of the push groove in the direction away from the center pipe 130, so that it can be clamped with the coupling 410 of the casing 400 to be sealed. Among them, because the two swing arms 220 are symmetrically arranged, the rotation trajectories of the two swing arms 220 are opposite. Therefore, one of the swing arms 220 can abut against the upper end surface of the lower casing when the snap-on sealing device continues to move downward along the casing 400 to be sealed, and under the relative force of the lower casing, it can produce a relative center rotation movement, while the other swing arm 220 can abut against the lower end surface of the upper casing when the snap-on sealing device moves upward along the casing 400 to be sealed, and under the relative force of the upper casing, it can produce a relative center rotation movement, so that the snap-on sealing device can be restricted to the coupling 410 of the casing 400 to be sealed through the two swing arms 220, thereby ensuring the stability of positioning and improving the accuracy of positioning.

[0067] Further, refer to Figure 5aThe articulated frame 210 is provided with articulated grooves 211 on both sides, through which the articulated grooves 211 can be hingedly connected to the swing arm 220. The two articulated grooves 211 are staggered, so that the swing arms 220 respectively arranged in the two articulated grooves 211 can also be staggered, which can reduce the axial space occupied by the articulated frame 210 and the swing arm 220 in the push groove, so that the axial size of the push groove used to set the articulated frame 210 and the swing arm 220 can also be reduced accordingly. The structure is flexible and compact, and it is easy to install and process.

[0068] Further, refer to Figure 5b The articulated frames 210 of every two adjacent clamping parts 200 are connected to each other, so that a plurality of articulated frames 210 are connected in sequence to form an articulated sleeve arranged around the central tube 130 in the pushing groove, thereby ensuring that the plurality of articulated frames 210 can move simultaneously and ensuring the synchronization of the rotation of the swing arm 220, thereby improving the stability of the positioning process.

[0069] Furthermore, two limiting rings are provided, one of which is sleeved on the outer periphery of a plurality of swing arms 220 provided near the joint 120, and the other limiting ring is sleeved on the outer periphery of a plurality of swing arms 220 provided away from the joint 120. The limiting rings can limit the movement of the swing arms 220. When the clamping type isolation device is lowered to the position to be sealed of the casing 400 to be sealed, the limiting rings can prevent the swing arms 220 from rotating outside the push groove, thereby preventing the swing arms 220 from being damaged by friction with the inner wall of the casing 400 to be sealed. When the clamping type isolation device reaches the position to be sealed of the casing 400 to be sealed, the swing arms 220 are pushed. When the force on the swing arms 220 exceeds a preset value, the limiting rings can be broken, thereby performing the clamping positioning process.

[0070] In some specific embodiments of the present invention, referring to Figure 2 The first guide sleeve 230 includes: a first sliding block 231 and a second sliding block 232. The first sliding block 231 and the second sliding block 232 are slidably disposed on the outer wall of the central tube 130 along the axial direction of the central tube 130. The first sliding block 231 abuts against the joint 120. A spring 233 is disposed between the first sliding block 231 and the second sliding block 232, and the second sliding block 232 and the swing arm 220 are adapted to and abut against each other.

[0071] Specifically, the first sliding block 231 is in contact with the end surface of the end of the joint 120 close to the swing arm 220 along the axial direction of the central tube 130, the second sliding block 232 is arranged between the swing arm 220 arranged close to the joint 120 and the first sliding block 231, and a spring 233 is arranged between the first sliding block 231 and the second sliding block 232. Through the elastic force of the spring 233, the second sliding block 232 can be driven to be in close contact with the end of the swing arm 220 arranged close to the joint 120 away from the hinge frame 210, so that a driving force can be further applied to the swing arm 220 arranged close to the joint 120, thereby preventing the swing arm 220 from rotating and improving the stability of positioning. At the same time, under the action of the elastic force of the spring 233, the swing arm 220 arranged away from the joint 120 can be indirectly pushed to abut against the second guide sleeve 240 through the sliding hinge frame 210, so that the swing arm 220 arranged away from the joint 120 can also be acted upon by the driving force, thereby preventing the swing arm 220 from rotating and improving the stability of positioning.

[0072] Furthermore, a guide hole is opened at one end of the second sliding block 232 close to the first sliding block 231 along the axial direction of the center tube 130, and a spring 233 is arranged in the guide hole. One end of the spring 233 is connected to the bottom of the guide hole, and the other end is connected to the first sliding block 231. The direction of the elastic force of the spring 233 can be limited through the guide hole, thereby ensuring the accuracy of the direction of the driving force applied to the swing arm 220 and preventing the spring 233 from derailing.

[0073] Furthermore, the lower side of the end of the swing arm 220 disposed near the joint 120 away from the articulated frame 210 is tapered, and the upper side of the end of the second sliding block 232 away from the first sliding block 231 is also tapered to match, so that the swing arm 220 disposed near the joint 120 can be mutually adapted and abutted with the second sliding block 232, and at the same time, it is also convenient to push the swing arm 220 to rotate. At the same time, the lower side of the end of the swing arm 220 disposed away from the joint 120 away from the articulated frame 210 is tapered, and the upper side of the end of the second guide sleeve 240 disposed near the joint 120 is also tapered to match, so that the swing arm 220 disposed away from the joint 120 can be mutually adapted and abutted with the second guide sleeve 240, and it is also convenient to push the swing arm 220 to rotate.

[0074] In some specific embodiments of the present invention, referring to Figure 1 The sealing part 300 includes two support rings 310. One of the support rings 310 is fixedly sleeved on the outer wall of the end of the central tube 130 away from the joint 120, and the other support ring 310 is slidably sleeved on the outer wall of the central tube 130 along the axial direction of the central tube 130. The two ends of the sealing ring 320 are respectively connected to the two support rings 310. Figure 2When the distance between the side of the bending section 131 close to the joint 120 and the end face of the side of the joint 120 close to the bending section 131 is reduced, while the swing arm 220 of the clamping part 200 is pushed and rotated to the outside of the pushing groove, the entire clamping part 200 will also move due to the push, thereby indirectly pushing the unidirectional slidable support ring 310 of the sealing part 300, so that the unidirectional slidable support ring 310 moves toward the direction close to the fixed support ring 310, thereby indirectly reducing the distance between the two support rings 310, and the sealing ring 320 arranged between the two support rings 310 will be compressed, so that the two axial ends of the sealing ring 320 gradually approach each other, and at the same time, the middle part of the sealing ring 320 will be lifted up, so that the middle part of the sealing ring 320 extends outward along the radial direction of the central tube 130 in the direction away from the central tube 130 until it abuts against the inner wall of the casing 400 to be sealed, thereby achieving sealing.

[0075] Furthermore, the two ends of the sealing ring 320 in the axial direction have a side away from the central tube 130 that is an arc conical surface, so as to facilitate lifting the middle part of the sealing ring 320 .

[0076] Furthermore, a rectangular thread structure is provided on the top of the two support rings 310, and a matching rectangular thread structure is also provided on one side of the two axial ends of the sealing ring 320 close to the center tube 130. The sealing ring 320 is respectively clamped with the two support rings 310, so that a trapezoidal sealing groove can be formed between the support ring 310 and the sealing ring 320. The trapezoidal sealing groove can ensure the sealing effect and also increase the contact area between the support ring 310 and the sealing ring 320, thereby increasing the friction force and avoiding the possibility of the sealing ring 320 falling out as a whole when the sealing ring 320 is compressed.

[0077] Furthermore, the fixed support ring 310 abuts against the tooth pattern on one side of the bending section 131 close to the joint 120, and the slidable support ring 310 abuts against the end of the second guide sleeve 240 away from the joint 120, thereby reinforcing the two support rings 310 to prevent them from falling out during compression.

[0078] In some specific embodiments of the present invention, referring to Figure 1 A sealing ring 330 is arranged in the middle of the side of the sealing ring 320 away from the support ring 310 around the circumference of the central tube 130, and is used to abut against the inner wall of the casing 400 to be sealed. An embedding groove is opened in the middle of the sealing ring 320 around the axial direction of the central tube 130, and the sealing ring 330 is embedded in the embedding groove. Figure 2When the middle part of the sealing ring 320 is lifted up, it can abut against the inner wall of the casing 400 to be sealed through the sealing ring 330, further ensuring the tightness of the abutment with the inner wall of the casing 400 to be sealed. At the same time, through the setting of the embedded groove, the position where the middle part of the sealing ring 320 is lifted up can be guided to ensure the accuracy of the abutment and improve the sealing effect.

[0079] In some specific embodiments of the present invention, referring to Figure 2 The outer wall of the central tube 130 is provided with an anti-reverse thread along the axial direction of the central tube 130, which is used for threaded clamping with the clamping portion 200 and the sealing portion 300. The first sliding block 231 is positioned and connected with the anti-reverse thread of the central tube 130 through a first positioning ring 2311, the second sliding block 232 is positioned and connected with the anti-reverse thread of the central tube 130 through a second positioning ring 2321, and the second guide sleeve 240 is positioned and connected with the anti-reverse thread of the central tube 130 through a third positioning ring 241. Under the action of the anti-reverse thread, the first sliding block 231, the second sliding block 232 and the second guide sleeve 240 can only slide in one direction on the central tube 130, that is, the first sliding block 231, the second sliding block 232 and the second guide sleeve 240 can only move in the direction close to the bending section 131, so when the cylinder 140 is withdrawn, the first sliding block 231, the second sliding block 232 and the second guide sleeve 240 will not move in the opposite direction, and the slidable support ring 310 will not move in the direction away from the fixed support ring 310, so that the sealing ring 320 can continue to maintain its original deformation state. At the same time, the two swing arms 220 on the articulated frame 210 will continue to rotate to the outside of the push groove, and will not rotate, thereby improving the stability of positioning.

[0080] It should be noted that the core shaft 110, the joint 120, the central tube 130, the hinge frame 210, the swing arm 220, the first guide sleeve 230, the first positioning ring 2311, the second sliding block 232, the second positioning ring 2321, the spring 233, the second guide sleeve 240, the third positioning ring 241 and the support ring 310 are all made of soluble metal materials, so that the above components can be in a certain concentration of CL - The sealing ring 320 and the sealing ring 330 are made of soluble rubber material, which can be quickly dissolved in a solution at a certain temperature, thereby avoiding residues in the sleeve.

[0081] Working process:

[0082] The snap-on sealing device is lowered to the sealing position of the casing 400 to be sealed, and the bending section 131 is pushed along the axial direction of the central tube 130 toward the joint 120 by the cylinder 140, so that the end of the central tube 130 close to the joint 120 is gradually inserted into the plug-in cavity and abuts against the bottom of the plug-in cavity.

[0083] In the above process, the end surface of the joint 120 close to the bending section 131 will directly push the first sliding block 231 to move in the direction close to the bending section 131, thereby indirectly pushing the second sliding block 232, the hinge frame 210, the second guide sleeve 240 and the slidably arranged support ring 310 to move together in the direction close to the bending section 131 through the first sliding block 231. The second sliding block 232 abuts against and contacts the swing arm 220 arranged close to the joint 120 and applies a pushing force, and the second guide sleeve 240 abuts against and contacts the swing arm 220 arranged away from the joint 120 and applies a pushing force. When the pushing force reaches a preset value, the two limiting rings break, thereby respectively driving the swing arm 220 arranged close to the joint 120 and the swing arm 220 arranged away from the joint 120 to continue to rotate until they rotate to the outside of the pushing groove and abut against the inner wall of the casing 400 to be sealed.

[0084] At the same time, the sliding support ring 310 moves toward the direction close to the bending section 131, so that the distance between the two support rings 310 is reduced, thereby compressing the sealing ring 320 between the two support rings 310, so that the middle part of the sealing ring 320 is lifted up until the sealing ring 330 surrounding the sealing ring 320 abuts against the inner wall of the casing 400 to be sealed, thereby completing the sealing.

[0085] Furthermore, in the process of gradually inserting one end of the center tube 130 close to the joint 120 into the plug-in cavity and abutting against the bottom of the plug-in cavity, when the force applied to the joint 120 exceeds a preset value, the pin connecting the joint 120 and the core shaft 110 will be sheared off, and the joint 120 will separate from the core shaft 110 and fall under the action of gravity. At this time, under the action of the anti-reverse thread, the first sliding block 231, the second sliding block 232 and the second guide sleeve 240 are restricted from moving in the opposite direction, and the elastic force of the spring 233 continues to apply pressure to the swing arm 220 and the slidable support ring 310, thereby ensuring the stability of positioning and sealing.

[0086] Then, the mandrel 110 is taken out, and the sealing ball 500 is lowered and abutted against the conical inner wall of the end of the central tube 130 away from the joint 120, so as to complete the placement and positioning of the sealing ball 500 and realize the sealing of the upper part of the casing 400. At this time, under the pressure of the upper part of the casing 400, the central tube 130 continues to move downward for a distance until the swing arm 220 reaches the position of the coupling 410 of the casing 400 to be sealed, and the swing arm 220 arranged near the joint 120 and the swing arm 220 arranged away from the joint 120 will continue to rotate until they rotate to the position of the coupling 410 of the casing 400 to be sealed, thereby completing the clamping.

[0087] Finally, under the action of the upper pressure of the casing 400 , the central pipe 130 pushes the sealing ring 320 between the two support rings 310 to be further compressed, thereby achieving the isolation of the casing 400 to be isolated.

[0088] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A snap-on sealing device, characterized in that: include: A mounting portion (100), wherein the mounting portion (100) is arranged along the axial direction of the casing (400) to be sealed; A pushing groove is provided on the outer periphery of the mounting portion (100), and the pushing groove can be contracted along the axial direction of the mounting portion (100); A clamping portion (200), the clamping portion (200) being movably disposed in the pushing groove; A swing arm (220) is rotatably provided on the clamping portion (200), and when the pushing groove contracts, it can push the clamping portion (200) and drive one end of the swing arm (220) to move in a direction away from the mounting portion (100); A sealing portion (300), the sealing portion (300) being arranged in the pushing groove in a circumferential direction around the mounting portion (100), and one end of the sealing portion (300) being movably connected to the pushing groove; A movable end of the sealing portion (300) is arranged toward the clamping portion (200); A sealing ring (320) is provided between the two ends of the sealing part (300). When the pushing groove contracts, it can push the movable end of the sealing part (300) to move, so that the middle part of the sealing ring (320) expands and deforms outward until it abuts against the inner wall of the casing (400) to be sealed.

2. The snap-on sealing device according to claim 1, characterized in that: The mounting portion (100) comprises: A mandrel (110); a central tube (130), the central tube (130) being movably disposed on the outer periphery of the core shaft (110) along the axial direction of the core shaft (110); a joint (120), wherein the joint (120) is detachably arranged on the outer periphery of the core shaft (110) along the axial direction of the core shaft (110), and the joint (120) is arranged opposite to one end of the central tube (130); The inner wall of one end of the joint (120) close to the central tube (130) and the outer wall of the core shaft (110) are combined to form an inserting cavity, and the inserting cavity is adapted to the end of the central tube (130) close to the joint (120); One end of the center tube (130) away from the joint (120) is a bent section (131) bent in a direction away from the core shaft (110), and the center tube (130) is combined with the end surface of the joint (120) through the bent section (131) to form the pushing groove.

3. The snap-on sealing device according to claim 2, characterized in that: A cylinder (140) is coaxially arranged on the outside of the core shaft (110), one end of the cylinder (140) is connected to the bending section (131), and the cylinder (140) can drive the central tube (130) to move along the axial direction of the core shaft (110) toward the joint (120).

4. The snap-on sealing device according to claim 2, characterized in that: There are a plurality of the clamping parts (200), and the plurality of the clamping parts (200) are evenly arranged along the circumference of the central tube (130).

5. The snap-on sealing device according to claim 4, characterized in that: The clamping portion (200) comprises: An articulated frame (210), the articulated frame (210) being slidably disposed on the outer wall of the central tube (130) along the axial direction of the central tube (130), and the swing arm (220) being hingedly disposed on one side of the articulated frame (210); A first guide sleeve (230), wherein the first guide sleeve (230) is slidably disposed on the outer wall of the center tube (130) along the axial direction of the center tube (130), and one end of the first guide sleeve (230) is disposed toward the swing arm (220), and one end of the first guide sleeve (230) close to the swing arm (220) and one end of the swing arm (220) close to the first guide sleeve (230) are mutually adapted and abutted.

6. The snap-on sealing device according to claim 5, characterized in that: The clamping portion (200) further comprises: A second guide sleeve (240), the second guide sleeve (240) being slidably disposed on the outer wall of the central tube (130) along the axial direction of the central tube (130); There are two swing arms (220), and the two swing arms (220) are arranged on both sides of the articulated frame (210) along the axial direction of the central tube (130); The first guide sleeve (230) and the second guide sleeve (240) are arranged in one-to-one correspondence with the two swing arms (220).

7. The snap-on sealing device according to claim 6, characterized in that: The first guide sleeve (230) comprises: A first sliding block (231) and a second sliding block (232), wherein the first sliding block (231) and the second sliding block (232) are slidably disposed on the outer wall of the central tube (130) along the axial direction of the central tube (130); The first sliding block (231) abuts against the joint (120); A spring (233) is provided between the first sliding block (231) and the second sliding block (232), and the second sliding block (232) and the swing arm (220) are adapted to and abut against each other.

8. The snap-on sealing device according to claim 2, characterized in that: The sealing portion (300) comprises: A support ring (310), wherein there are two support rings (310), one of which is fixedly sleeved on the outer wall of one end of the center tube (130) away from the joint (120), and the other of which is slidably sleeved on the outer wall of the center tube (130) along the axial direction of the center tube (130); Both ends of the sealing ring (320) are respectively connected to the two supporting rings (310).

9. The snap-on sealing device according to claim 8, characterized in that: A sealing ring (330) is provided in the middle of the side of the sealing ring (320) away from the supporting ring (310) around the circumference of the central tube (130) for contacting the inner wall of the casing (400) to be sealed when the middle of the sealing ring (320) expands and deforms outward.

10. The snap-on sealing device according to any one of claims 2 to 9, characterized in that: An anti-reverse thread is provided on the outer wall of the central tube (130) along the axial direction of the central tube (130) for threadedly engaging with the engaging portion (200) and the sealing portion (300).

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