Single-pipe double-blocking sealing device

Abstract

The invention relates to the technical field of pipeline sealing, in particular to a single-pipe double-blocking sealing device which comprises a pipeline cover, a screw, a first sliding sealing assembly, a second sliding sealing assembly and a rope wheel assembly. The screw rod is arranged in the center of the pipeline, the part, extending into the pipeline, of the screw rod is movably sleeved with the first sliding sealing assembly, and the first sliding sealing assembly is driven to move to seal the inner side of the pipeline and the pipeline cover; the portion, extending out of the pipeline, of the screw is movably sleeved with a pipeline cover and a rope wheel assembly, a second sliding sealing assembly is arranged on the guide rail outside the pipeline, and the rope wheel assembly drives the second sliding sealing assembly to move to seal the portion between the outer side of the pipeline and the pipeline cover. The problem of internal and external sealing of the pipeline is solved.

Description

Technical Field

[0001] The invention relates to the technical field of semiconductor-grade pipeline sealing, and in particular to a single-tube double-blocking sealing device. Background Art

[0002] Semiconductor pipe valves and other parts need to solve the problem of temporary plugging in pressure test occasions. The existing technology can only use flange covers or sheet welding to complete the plugging, but semiconductor pipe valves have very high requirements for leakage rate. The existing technology may cause poor sealing effect and cannot fully meet the leakage rate requirements. At the same time, it will cause the flange cover and fasteners to be idle and wasted; if a simpler bolt connection is used for plugging, the sealing is worse and the installation and disassembly are also cumbersome.

[0003] Therefore, there is a need for a double blocking sealing device that can provide sealing both inside and outside to well wrap the port of the pipeline. Summary of the invention

[0004] Therefore, the present invention provides a single-tube double-blocking sealing device, which solves the problem of how to simultaneously seal the inside and outside of the pipe opening, thereby wrapping the pipe opening, by arranging a pipe cover, a screw, a first sliding sealing assembly, a second sliding sealing assembly and a pulley assembly.

[0005] The technical solution of the present invention is as follows: a single-tube double-blocking sealing device, comprising a pipeline cover, a screw, a first sliding sealing assembly, a second sliding sealing assembly and a rope pulley assembly;

[0006] The screw is arranged at the center of the pipeline, and a first sliding sealing assembly is movably sleeved on the portion of the screw extending into the pipeline. The screw drives the first conical slider in the first sliding sealing assembly to move axially, thereby squeezing and sealing the first C-shaped sealing ring sleeved on the periphery of the first conical slider on the inner wall of the pipeline, and the screw drives the expansion leaf in the first sliding sealing assembly to expand radially and seal between the inner wall of the pipeline and the pipeline cover;

[0007] A pipe cover and a pulley assembly are movably sleeved on the portion of the screw extending out of the pipe, a guide rail is arranged on the periphery of the pipe, and a second sliding sealing assembly is arranged on the guide rail. The screw drives the pulley assembly to rotate through an elastic slider arranged at the center of the pulley assembly, and the pulley assembly drives the conical pressure block in the second sliding sealing assembly to radially shrink and seal between the outer wall of the pipe and the pipe cover.

[0008] Preferably: the first conical slider and the expansion leaf are slidably arranged on the periphery of the screw, the conical surface of the expansion leaf is slidably engaged with the conical surface of the first conical slider, and the two right-angled surfaces of the expansion leaf are abutted against the inner wall of the pipe on one side and against the inner wall of the pipe cover on the other side;

[0009] The first sliding seal assembly further includes a nut and a square snap ring, the nut and the square snap ring are fixed as one, or the nut and the square snap ring are in friction contact; the nut and the square snap ring are sleeved on the outer periphery of the screw, the nut and the screw are threadedly connected, the square snap ring and the screw are slidably connected or intermittently arranged; the first conical slider is close to the square snap ring;

[0010] The first C-shaped sealing ring is clamped between the square clamp ring, the first tapered slider and the pipe.

[0011] Preferably: the expansion leaf is arranged in blocks around the circumference, or is an annular sealing ring, or a sealing ring is sleeved on the periphery of the dispersed blocks arranged around the circumference;

[0012] The outer periphery of the expansion leaf is provided with a second C-shaped sealing ring, and the second C-shaped sealing ring is clamped between the expansion leaf and the pipeline.

[0013] Preferably: the square snap ring has a square groove inside, which cooperates with the square outer surface of the first conical slider, or a key and keyway are provided between the inside of the square snap ring and the first conical slider; a first spring is provided between the square snap ring and the end of the first conical slider.

[0014] Preferably: a guide rod is fixedly connected to the side of the pipeline cover facing the inside of the pipeline, and the guide rod cooperates with the first conical slider for guidance;

[0015] The guide rod passes through the slide rod, a protrusion is arranged on the inner surface of the guide rod, a groove is arranged on the outer surface of the screw rod, and the protrusion is installed in cooperation with the groove.

[0016] Preferably: the guide rails are circumferentially distributed around the periphery of the pipeline, and the guide rails are clamped on the pipeline cover by means of clamping blocks arranged on the guide rails; and the guide rails have an arc surface that matches the pipeline cover.

[0017] Preferably, the second sliding seal assembly further comprises a second conical slider, the second conical slider is slidably arranged on the guide rail, the conical pressing block is movably supported on the guide rail, the conical surface of the second conical slider is in sliding contact with the conical surface of the conical pressing block, and the two right-angled surfaces of the conical pressing block, one of which is in contact with the pipe. The other side is attached to the outer wall of the pipe and the other side is attached to the inner side of the pipe cover. Side wall;

[0018] The second sliding seal assembly also includes a third C-type sealing ring, which is clamped between the conical pressing block and the pipeline.

[0019] Preferably: the guide rail is provided with guide grooves and guide blocks in the radial direction to guide the conical pressing block;

[0020] A third spring is arranged between the end of the guide rail and the second conical sliding block.

[0021] Preferably: the rope pulley assembly comprises a rope pulley, a pull rope and a fourth spring;

[0022] A rectangular hole is provided at the center of the rope wheel, and guide holes are opened outward from each side of the rectangular hole. The slider is elastically arranged in the guide hole through a fourth spring, and the screw rod is penetrated in the rectangular hole at the center of the rope wheel. When the screw rod rotates, it is moved to the slider.

[0023] Preferably: a ferrule is sandwiched between the screw and the pipe cover; the ferrule is fixed on the screw, and in this case, a dynamic sealing bearing or a sealing ring is arranged between the ferrule and the pipe cover; or, the ferrule is fixed on the pipe cover, and in this case, a dynamic sealing bearing or a sealing ring is arranged between the ferrule and the screw.

[0024] Compared with the prior art, the present invention adopts the above technical solution, and only needs to keep turning the screw to seal the outer surface and the inner surface of the pipeline, thereby achieving quick fixing and sealing with simple operation, and increasing the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a semi-cutaway perspective view of the device of the present invention;

[0026] Figure 2 yes Figure 1 Right-view full view of the foundation;

[0027] Figure 3 It is a state diagram when the device of the present invention is not screwed in;

[0028] Figure 4 is a state diagram of the device of the present invention being screwed into and pressed against the outer surface of the pipe;

[0029] Figure 5 This is a state diagram of the device of the present invention continuing to screw in and squeeze the first C-type sealing ring;

[0030] Figure 6 This is a state diagram of the device of the present invention continuing to screw in and squeeze the second C-type sealing ring.

[0031] Figure number marking:

[0032] 110-pipe; 120-pipe cover; 200-screw; 210-ferrule;

[0033] 310-expansion leaf; 320-first conical slider; 330-square snap ring; 331-nut; 332-first spring; 340-first C-type sealing ring; 341-second C-type sealing ring; 342-third C-type sealing ring;

[0034] 311 - guide rod, 312 - second spring, 313 - protrusion, 314 - groove;

[0035] 410-guide rail; 420-third spring; 430-second conical slider; 440-conical pressure block;

[0036] 411-block; 412-guide groove; 413-guide block;

[0037] 510- rope wheel; 520- pull rope; 530- slider; 540- fourth spring;

[0038] 511-guide hole; 531-guide rod. DETAILED DESCRIPTION

[0039] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments. Those skilled in the art should know that the following embodiments are not the only limitation to the technical solutions of the present invention, and any equivalent changes or modifications made within the spirit of the technical solutions of the present invention should be deemed to fall within the protection scope of the present invention.

[0040] like Figure 1 to Figure 6 As shown, the present invention provides a single-tube double-blocking sealing device, which is provided with a pipeline cover 120. The device is used to seal the pipeline 110. The function of the pipeline cover 120 is to block it at the port of the pipeline 110 to achieve sealing at the pipeline port. Therefore, the device is for the purpose of achieving sealing of the pipeline 110, and a screw 200, a first sliding sealing assembly, a second sliding sealing assembly and a rope pulley assembly are arranged around the pipeline cover 120.

[0041] The screw 200 is arranged at the center of the pipe 110, and a pipe cover 120 is sleeved on the end of the screw 200 extending out of the pipe 110. When assembling, the pipe cover 120 is close to the pipe opening to block the pipe opening; a first sliding seal assembly is sleeved on the end of the screw 200 extending into the pipe 110, and the function of the first sliding seal assembly is to move along the axial direction of the screw 200, and finally abut between the inner side of the pipe 110 and the pipe cover 120 to achieve sealing of the inner side of the pipe opening. A pulley assembly is arranged at the end of the screw 200 extending out of the pipe 110, and a guide rail 410 is arranged on the periphery of the pipe 110, and a second sliding seal assembly is arranged on the guide rail 410. The second sliding seal assembly slides along the guide rail 410 under the action of the pulley assembly and the screw 200, and finally abuts between the outer side of the pipe 110 and the pipe cover 120 to achieve sealing of the outer side of the pipe opening.

[0042] The purpose of setting the screw 200 in the present invention is to enable it to rotate, so there is a dynamic seal between the screw 200 and the pipe cover 120. Therefore, preferably, in order to ensure the sealing between the screw 200 and the pipe cover 120 and reduce the wear of the pipe cover 120 when the screw 200 rotates, a clamping sleeve 210 is sandwiched between the screw 200 and the pipe cover 120. The clamping sleeve 210 can be fixedly sleeved (or interference fit) on the screw 200. At this time, the pipe cover 120 is rotated and clamped by the clamping sleeve 210, and a dynamic seal bearing is set between the clamping sleeve 210 and the pipe cover 120, or a sealing ring is set, or a certain degree of sealing is achieved simply by pressing the clamping sleeve 210 and the pipe cover 120. The sealing property enables the screw 200 to move in rotation instead of in the axial direction. The sleeve 210 can also be fixed (or interference fit) In the center of the pipe cover 120, the screw 200 passes through the ferrule 210. At this time, a dynamic sealing bearing or a sealing ring is arranged between the screw 200 and the ferrule 210, or a certain sealing is achieved only by pressing the ferrule 210 and the screw 200.

[0043] Furthermore, the first sliding seal assembly includes but is not limited to a nut 331, a square snap ring 330, a first conical slider 320, an expansion leaf 310, a first C-type sealing ring 340 and a second C-type sealing ring 341. In an embodiment, the nut 331 and the square snap ring 330 are fixed as one body, or the contact surface between the nut 331 and the square snap ring 330 is set to a surface with a large friction force so that it does not slip, for example, the contact surface between the nut 331 and the square snap ring is set to a patterned protrusion.

[0044] Both are sleeved on the outer periphery of the screw 200, wherein the nut 331 is threadedly connected to the screw 200, while the square snap ring 330 is slidably connected to the screw 200 and can be provided with a bearing support, or can be intermittently provided with the screw 200; when the screw 200 only rotates but does not move axially, the nut 331 and the square snap ring 330 move together along the screw 200, and can then be pushed toward the direction of the pipe cover 120. A first conical slider 320 is provided on the side of the square snap ring 330 away from the nut 331, and an expansion leaf 310 is provided opposite to the first conical slider 320. The conical surface of the first conical slider 320 is movably engaged with the conical surface of the expansion leaf 310, and can slide relative to each other along the inclined surface; the two right-angled surfaces of the expansion leaf 310, one side is attached to the inner wall of the pipe 110, and the other side is attached to the inner wall of the pipe cover 120.

[0045] The first conical slider 320 and the expansion leaf 310 are both circumferentially arranged on the periphery of the screw 200 and are in clearance fit with the screw 200; the first conical slider 320 can be a whole piece or several pieces dispersed in the circumferential direction; the expansion leaf 310 can be several independent hard material metal blocks dispersed in the circumferential direction, or a large annular sealing ring, or a sealing ring can be jointly set on the periphery of the dispersed blocks arranged in the circumference to achieve sealing; because the expansion leaf 310 needs to expand outward; when the square clamp ring 330 moves, it contacts the first conical slider 320 and pushes it forward. After the first conical slider 320 contacts the expansion leaf 310, the expansion leaf 310 is further pushed to the right and outward by the action of the conical surface (according to Figure 1 As shown in FIG. 1 , the two right-angled surfaces of the expansion leaf 310 are respectively fitted with the pipeline 110 and the pipeline cover 120. The first conical slider 320 is provided with a stepped shoulder on its surface, and a first C-shaped sealing ring 340 is sleeved on the stepped shoulder. The first C-shaped sealing ring 340 is clamped between the square clamp ring 330 and the first conical slider 320. When the square clamp ring 330 pushes the first conical slider 320 On the other hand, the first C-shaped sealing ring 340 will also be squeezed. After the C-shaped sealing ring 340 is squeezed, The expansion leaf 310 is arched up and closely attached to the inner wall of the pipe 110 to achieve the first seal with the pipe 110. A second C-shaped sealing ring 341 is sleeved on the side of the expansion leaf 310 that contacts the pipe 110. When the first conical slider 320 squeezes the expansion leaf 310 to expand outward, the second C-shaped sealing ring 341 closely attaches to the inner wall of the pipe 110 to achieve the second seal with the pipe 110.

[0046] As a preferred solution, the square retaining ring 330 is in a "[" shape, with the outer side of the end portion fixed as a whole with the nut 331, and the circumference is cylindrical to cooperate with the inner surface of the pipe 110, and the interior has a square groove to cooperate with the square outer surface of the first conical slider 320, or, a key and keyway are provided between the interior of the square retaining ring 330 and the first conical slider 320 to prevent relative rotation between the square retaining ring 330 and the first conical slider 320, and only ensure axial movement.

[0047] As a preferred solution, one section of the outer surface of the first conical slider 320 is square and cooperates with the square retaining ring 330 and is fitted with the first C-type sealing ring 340, and the other section is conical and cooperates with the expansion leaf 310; a first spring 332 is arranged between the first conical slider 320 and the square retaining ring 330 as an elastic connection, the square retaining ring 330 compresses the first spring 332 to push the first conical slider 320, and the square retaining ring 330 retreats when the first spring 332 is relaxed, so that during disassembly, the first spring 332 can prevent the first C-type sealing ring 340 from arching, thereby facilitating disassembly; the first conical slider 320 has a hole in the center, and the gap in the hole passes through the screw 200 to prevent the first conical slider 320 from being linked with the screw 200.

[0048] As a preferred solution, the first conical slider 320 relies on the guide rod 311 as a guide to ensure that it moves axially along the screw 200 without rotating. A hollow guide rod 311 is fixedly connected to the side of the pipe cover 120 facing the inside of the pipe, and the expansion leaf 310 is on the periphery of the guide rod 311. The central gap of the guide rod 311 passes through the slide bar 200 to prevent the guide rod 311 from being linked with the screw 200. The outer surface of the guide rod 311 cooperates with the central hole of the first conical slider 320, so that the first conical slider 320 slides along the guide rod 311.

[0049] Furthermore, in order to prevent the first conical slider 320 and the guide rod 311 from rotating relative to each other, the cooperation between the two can be achieved by opening a square hole at the portion where the center hole of the first conical slider 320 and the guide rod 311 cooperate, and the outer surface of the guide rod 311 is also designed to be square; or, a guide groove is opened at the center hole of the first conical slider 320, and a guide bar is designed on the outer surface of the guide rod 311 accordingly; or, a key and a key groove are provided between the first conical slider 320 and the guide rod 311 to cooperate with each other to avoid relative rotation and enable axial movement, and the guide bar is installed in the guide groove to connect the two. Furthermore, on the guide rod A second spring 312 is provided between the first tapered slider 311 and the first tapered slider 320 to guide the first tapered slider 320. Provides buffering.

[0050] Furthermore, in order to prevent axial movement of the screw 200 and strengthen the seal between the pipe cover 120 and the screw 200, a protrusion 313 is set on the inner surface of the guide rod 311, and a groove 314 is set on the outer surface of the screw 200. The protrusion 313 and the groove 314 are installed in coordination to form a bearing-like structure, which prevents the screw 200 from axial movement and enables rotation.

[0051] As a preferred solution, the expansion leaf 310 and the pipe cover 120 can be directly fixed, but the expansion leaf 310 is an elastic member, and the expansion is achieved through the elastic deformation of the expansion leaf 310; or, a guide rail can be set on the inner wall of the pipe cover 120, so that the expansion leaf 310 can be radially contracted and expanded along the guide rail; or, the expansion leaf 310 and the pipe cover 120 can be movably connected, and the expansion leaf 310 moves against the pipe cover 120 and expands outward. After the expansion leaf 310 is compressed, it clamps the second C-shaped sealing ring 341 on the inner surface of the pipe to form a second seal.

[0052] The above only introduces the function and role of the first sliding sealing assembly in cooperation with the pipe cover 120 and the screw 200 from the perspective of structure and working principle. The power source of the first sliding sealing assembly comes from the screw 200. By rotating the screw 200, the nut 331 and the square retaining ring 330 push the first conical slider 320 and the expansion leaf 310, causing the first C-type sealing ring 340 and the second C-type sealing ring 341 to be squeezed, thereby sealing the inner side of the pipe 110.

[0053] Regarding the sealing of the outer side of the pipe port, as mentioned above, a guide rail 410 is provided on the periphery of the pipe 110, and the guide rail 410 is supported by the pipe cover 120, and may be fixed or may be clamped on both sides axially; a second sliding sealing assembly is provided on the guide rail 410, and the second sliding sealing assembly slides along the guide rail 410 under the action of the pulley assembly and the screw 200, and finally rests between the outer side of the pipe 110 and the pipe cover 120, so as to achieve sealing of the outer side of the pipe port.

[0054] Furthermore, the guide rails 410 are divided into several and arranged symmetrically on the periphery of the pipe 110. The guide rails 410 run along the axial direction of the pipe 110. Two clamping blocks 411 are provided on each guide rail 410. The two clamping blocks 411 are clamped on the left and right sides of the pipe cover 120, so that the pipe cover 120 can support the guide rails 410 and limit the left and right movement of the guide rails 410. In order to match the circular outer surface of the pipe cover 120, the inner surface of the guide rails 410 is set to an arc shape. Among them, the multiple guide rails 410 can be fixed to each other to form a ring; and in order to prevent the guide rails 410 from rotating in the circumferential direction, a groove for clamping the clamping blocks 411 can be provided on the outer surface of the pipe cover 120.

[0055] Furthermore, the second sliding seal assembly includes but is not limited to a second tapered slider 430, a tapered The pressing block 440 and the third C-type sealing ring 342. The second conical slider 430 is slidably arranged on the guide rail 410, and the conical pressing block 440 is movably supported on the guide rail 410 and can move radially; the conical surface of the second conical slider 430 is opposite to the conical surface of the conical pressing block 440, and can slide relative to each other along the inclined surface; the two right-angled surfaces of the conical pressing block 440, one side is attached to the outer wall of the pipe 110, and the other side is attached to the inner wall of the pipe cover 120. After the second conical slider 430 moves to contact the conical pressing block 440, the conical surface further pushes the conical pressing block 440 to move rightward and inward, so that the two right-angled surfaces of the conical pressing block 440 are respectively attached to the pipe 110 and the pipe cover 120. A third C-shaped sealing ring 342 is clamped between the conical pressing block 440 and the pipe 110 . When the second conical sliding block 430 pushes the conical pressing block 440 , the third C-shaped sealing ring 342 is squeezed tightly against the outer wall of the pipe 110 to achieve a third seal (external seal) with the pipe 110 .

[0056] Furthermore, a third spring 420 is provided between the second tapered slider 430 and the end of the guide rail 410 for resetting the second tapered slider 430 , that is, moving the second tapered slider 430 to the left.

[0057] As a preferred solution, a guide groove 412 and a guide block 413 are provided on the guide rail 410, and correspondingly, a convex block (corresponding to the guide groove 412) and a concave block (corresponding to the guide block 413) are provided on the conical pressing block 440, and the convex and concave cooperate to guide the conical pressing block 440, so that the conical pressing block 440 can move radially along the guide rail 410. Furthermore, the conical pressing block 440 is also preferably made of elastic material, and the extrusion deformation can form a good seal on the outer port of the pipeline.

[0058] As a preferred solution, the power of the second conical slider 430 depends on the rope pulley assembly, and the power of the rope pulley assembly depends on the screw rod 200. The rope pulley assembly includes but is not limited to a rope pulley 510, a pull rope 520, a slider 530, and a fourth spring 540. A rope pulley 510 is sleeved on the end of the screw rod 200 extending out of the pipeline cover 120. The center of the rope pulley 510 is set as a rectangular hole, and the part where the screw rod 200 and the rope pulley 510 cooperate is also set as a rectangle or a rectangle with a rounded chamfer, so that when the screw rod 200 is rotated, the rope pulley 510 can be driven to rotate together, thereby providing power to the rope pulley 510; the pull rope 520 is wound around the rope pulley 510, and the pull rope 520 is tightened or loosened according to the change of the rotation direction of the rope pulley 510, and the other end of the pull rope 520 is connected to the second conical slider 430.

[0059] On the rope wheel 510, a guide hole 511 is radially arranged outward from the rectangular hole. A slider 530 and a fourth spring 540 are arranged in the guide hole 511. The fourth spring 540 is sandwiched between the slider 530 and the bottom of the guide hole 511. Further, the slider 530 may be A guide rod 531 is connected to the top, and a fourth spring 540 is sleeved on the guide rod 531. Guide the spring.

[0060] The force between the screw 200 and the rope pulley 510 is actually transmitted through the slider 530. The screw 200 is inserted in a hole surrounded by several sliders 530. When the screw 200 rotates, the slider 530 is moved to generate a tangential force, so that the slider 530 touches the wall of the guide hole 511, thereby moving the rope pulley 510 to rotate; on the other hand, when the screw 200 moves the slider 530, it will also generate a vertical force on the slider 530, so that the slider 530 compresses the fourth spring 540 and moves toward the inside of the guide hole 511; according to the reverse action principle, if the rope pulley 510 is subjected to an external force and resists the moving force given by the slider 530, the rope pulley 510 can no longer rotate, and the slider 530 can only move along the direction of the guide hole 511. At this time, the screw 200 is decoupled from the rope pulley 510, and the screw 200 continues to rotate while the rope pulley 510 can stop rotating. Combining the correlation between the second sliding seal assembly and the rope pulley assembly, it can be seen that when the screw 200 is initially rotated, the screw 200 drives the rope pulley 510 to rotate through the slider 530, and the rope pulley 510 drives the pull rope 520 to contract and tighten, and the pull rope 52 pulls the second conical slider 430 along the guide rail 410 toward the conical pressure block 440, thereby pushing and squeezing the conical pressure block 440. When the second conical slider 430 squeezes the conical pressure block 440 into place, the pull rope 520 will no longer be able to pull the second conical slider 430. The pulling force of the pull rope 520 is greater than the elastic force of the fourth spring 540, and the screw 200 can no longer drive the rope pulley 510 to rotate. At this time, the screw 200 only has the compression slider 530 to move into the guide hole 511, and the slider 530 provides space for the screw 200 to continue rotating.

[0061] The above describes from the perspective of structure and working principle that under the driving action of the screw rod 200 and the rope pulley assembly, force is applied to the second sliding seal assembly, so that the second sliding seal assembly slides to seal the outside of the pipeline 110.

[0062] It can be seen that the device can achieve internal and external double sealing of the pipeline 110 by rotating the screw 200 during the assembly process. The entire assembly process is:

[0063] Step 1: First, insert the entire device into the opening of the pipeline, so that the screw 200 and the first sliding seal assembly extend into the pipeline 110, and the pipeline cover 120 is as close to the pipeline opening as possible, see Figure 3 ;

[0064] Step 2: Rotate the screw 200, which will bring about two action effects:

[0065] 1. The screw rod 200 moves the slider 530 to drive the rope wheel 510 to rotate. At the same time, the slider 530 compresses the fourth spring 540 to slide radially along the guide hole 511. The rope wheel 510 drives the pull rope 420 to shrink and tighten, so that the second tapered slider 430 is pushed along the guide rail 410 toward the tapered pressure block 440. The third spring 420 provides auxiliary thrust. The conical pressing block 440 is provided along the guide groove 412 of the guide rail 410. and guide block 413 extruding the outer surface of the pipe A plurality of third C-shaped sealing rings 342 are used to seal the pipeline. Figure 4 ;

[0066] Second, when the screw 200 rotates, the nut 331 and the square snap ring 330 are driven to move along the rod, and the square snap ring 330 pushes the first conical slider 320 toward the expansion leaf 310 (but it may not be in contact with the expansion leaf 310 at this time), and the first spring 332 provides auxiliary driving force for the first conical slider 320. At the same time, the square snap ring 330 squeezes the first C-type sealing ring 340, causing the first C-type sealing ring 340 to be compressed and deformed. The first C-type sealing ring 340 arches up and fits tightly against the inner wall of the pipe 110 to achieve the first inner sealing of the pipe 110, see Figure 5 ;

[0067] Step 3: Continue to rotate the screw 200 degrees, which will bring about two action effects:

[0068] 1. When the conical pressing block 440 is squeezed into place, the rope wheel 510 stops rotating and the second sliding sealing assembly stops moving;

[0069] Second, the nut 331 and the square clamp ring 330 continue to move forward, and the first conical slider 320 pushes and squeezes the expansion leaf 310, so that the expansion leaf 310 is pressed against the inner wall of the pipe cover 120 and the inner wall of the pipe 110 at the same time, and the second C-shaped sealing ring 341 is pressed against the inner wall of the pipe 110 to realize the second inner sealing of the pipe 110, see Figure 6 , so far, the loading process is completed.

[0070] The unloading process can be performed by reversing the screw 200.

Claims

1. A single-tube double-blocking sealing device, characterized in that: It comprises a pipeline cover (120), a screw rod (200), a first sliding seal assembly, a second sliding seal assembly and a rope pulley assembly; The screw (200) is arranged at the center of the pipeline (110), and a first sliding sealing component is movably sleeved on the portion of the screw (200) extending into the pipeline (110). The screw (200) drives a first conical slider (320) in the first sliding sealing component to move axially, thereby squeezing and sealing a first C-shaped sealing ring (340) sleeved on the outer periphery of the first conical slider (320) on the inner side wall of the pipeline (110). The screw (200) drives the expansion leaf (310) in the first sliding sealing component to expand radially and seal between the inner side wall of the pipeline (110) and the pipeline cover (120); The portion of the screw rod (200) extending out of the pipe (110) is movably sleeved with a pipe cover (120) and a rope pulley assembly, a guide rail (410) is arranged on the periphery of the pipe (110), and a second sliding sealing assembly is arranged on the guide rail (410), the screw rod (200) drives the rope pulley assembly to rotate via an elastic slider (530) arranged at the center of the rope pulley assembly, and the rope pulley assembly drives the conical pressing block (440) in the second sliding sealing assembly to radially shrink and seal between the outer wall of the pipe (110) and the pipe cover (120).

2. The single-tube double-blocking sealing device according to claim 1, characterized in that: The first conical slider (320) and the expansion leaf (310) are slidably disposed on the periphery of the screw (200); the conical surface of the expansion leaf (310) is slidably engaged with the conical surface of the first conical slider (320); and the two right-angled surfaces of the expansion leaf (310) are abutted against the inner wall of the pipe (110) on one side and against the inner wall of the pipe cover (120) on the other side; The first sliding seal assembly further comprises a nut (331) and a square snap ring (330), wherein the nut (331) and the square snap ring (330) are fixed as one body, or the nut (331) and the square snap ring (330) are in frictional contact; the nut (331) and the square snap ring (330) are sleeved on the outer periphery of the screw rod (200), the nut (331) and the screw rod (200) are threadedly connected, and the square snap ring (330) and the screw rod (200) are slidingly connected or intermittently arranged; the first conical slider (320) is close to the square snap ring (330); The first C-shaped sealing ring (340) is clamped between the square clamp ring (330), the first tapered slider (320) and the pipe (110).

3. The single-tube double-blocking sealing device according to claim 2 is characterized in that: The expansion leaf (310) is arranged in blocks around the circumference, or is an annular sealing ring, or a sealing ring is sleeved on the periphery of the dispersed blocks arranged around the circumference; A second C-shaped sealing ring (341) is sleeved on the outer periphery of the expansion leaf (310), and the second C-shaped sealing ring (341) is clamped between the expansion leaf (310) and the pipeline (110).

4. The single-tube double-blocking sealing device according to claim 2 or 3, characterized in that: The square retaining ring (330) has a square groove inside, which cooperates with the square outer surface of the first conical slider (320), or a key and keyway are provided between the inside of the square retaining ring (330) and the first conical slider (320); a first spring (332) is provided between the square retaining ring (330) and the end of the first conical slider (320).

5. The single-tube double-blocking sealing device according to claim 1, 2 or 3, characterized in that: A guide rod (311) is fixedly connected to one side of the pipeline cover (120) facing the inside of the pipeline (110), and the guide rod (311) cooperates with the first conical sliding block (320) for guidance; The guide rod (311) passes through the slide rod (200), a protrusion (313) is provided on the inner surface of the guide rod (311), and a groove (314) is provided on the outer surface of the screw rod (200), and the protrusion and the groove are installed in coordination.

6. The single-tube double-blocking sealing device according to claim 1, characterized in that: The guide rail (410) is circumferentially distributed on the periphery of the pipeline (110), and the guide rail (410) is clamped on the pipeline cover (120) through a clamping block (411) arranged on the guide rail (410); the guide rail (410) has an arc surface that matches the pipeline cover (120).

7. The single-tube double-blocking sealing device according to claim 1 or 6, characterized in that: The second sliding sealing assembly further comprises a second conical slider (430), the second conical slider (430) being slidably disposed on the guide rail (410), the conical pressing block (440) being movably supported on the guide rail (410), the conical surface of the second conical slider (430) being in sliding contact with the conical surface of the conical pressing block (440), and the two right-angled surfaces of the conical pressing block (440), one surface being in contact with the outer wall of the pipeline (110), and the other surface being in contact with the inner wall of the pipeline cover (120); The second sliding seal assembly further comprises a third C-type sealing ring (342), wherein the third C-type sealing ring (342) is clamped between the conical pressing block (440) and the pipeline (110).

8. The single-tube double-blocking sealing device according to claim 6, characterized in that: The guide rail (410) is provided with a guide groove (412) and a guide block (413) in the radial direction to guide the conical pressing block (440); A third spring (420) is provided between the end of the guide rail (410) and the second tapered sliding block (430).

9. The single-tube double-blocking sealing device according to claim 1, characterized in that: The rope pulley assembly comprises a rope pulley (510), a pull rope (520) and a fourth spring (540); A rectangular hole is provided at the center of the rope wheel (510), and guide holes (511) are opened outward from each side of the rectangular hole. The slider (530) is elastically arranged in the guide hole (511) through a fourth spring (540). The screw rod (200) is inserted into the rectangular hole at the center of the rope wheel (510), and the screw rod (200) is moved to the slider (530) when rotating.

10. The single-tube double-blocking sealing device according to claim 1, characterized in that: A clamping sleeve (210) is sandwiched between the screw rod (200) and the pipeline cover (120); The ferrule (210) is fixed on the screw (200), and at this time, a dynamic sealing bearing or a sealing ring is provided between the ferrule (210) and the pipeline cover (120); Alternatively, the ferrule (210) is fixed on the pipeline cover (120), and in this case, a dynamic sealing bearing or a sealing ring is provided between the ferrule (210) and the screw (200).

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