A variable-diameter gate front sealing assembly with a multi-layer pad iron structure

Abstract

The utility model discloses a variable diameter gate front sealing assembly of multilayer pad iron structure relates to the technical field of gate front sealing, and it is front end middle part of sealing rubber body has arc concave surface no.

Description

Technical Field

[0001] This utility model relates to the field of gate front sealing technology, and in particular to a variable diameter gate front sealing assembly with a multi-layer pad structure. Background Technology

[0002] In oil drilling, gate blowout preventers (BOPs) are crucial safety devices for preventing well kicks or blowouts, and the gate front seal is a key component for sealing the pressure inside the well. Fixed-hole gate front seals can only seal one type of tubing string. When the tubing string used in the well is incompatible, a gate of the appropriate size needs to be replaced, resulting in high labor intensity, high operating costs, and low efficiency. Existing double-layer shim structure variable-diameter front seals have a small sealing range for the tubing string, and the gaps between the shims are large when the tubing string is tightened to form a seal, leading to easy rubber loss and making them unsuitable for high-temperature and high-pressure conditions. Traditional large-range variable-diameter gates require a large amount of rubber storage, typically employing a multi-frame composite structure, resulting in high manufacturing costs and making them unsuitable for installation on existing fixed-hole gate bodies.

[0003] Therefore, how to provide a multi-layered shim structure for the front sealing assembly of a variable diameter gate that can seal multiple diameter pipe columns under high temperature and high pressure conditions without changing the original fixed-diameter gate body structure is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, this utility model proposes a multi-layer shim structure for sealing the front of a variable diameter gate, aiming to solve the technical problem that the traditional blowout preventer gate sealing structure cannot be used to seal tubing of different diameter specifications without changing the original fixed-diameter gate body structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a multi-layered shim structure for the front sealing assembly of a variable diameter gate, comprising:

[0007] A sealing rubber body, wherein the front end of the sealing rubber body has an arc-shaped concave surface at the middle for pressing against the outer peripheral wall of the column to be sealed;

[0008] Main pad one and main pad two; the main pad one and main pad two have their surfaces facing each other and are embedded in the front top and bottom surfaces of the sealing rubber body respectively; each of the main pad one and main pad two has an avoidance notch at one end of the width direction corresponding to the arc-shaped concave surface.

[0009] A semi-annular variable diameter gasket assembly 1 is embedded in the front part of the sealing rubber body and is correspondingly attached to the plate surface of the main gasket 1 near the main gasket 2; the inner peripheral wall of the variable diameter gasket assembly 1 corresponds to the arc-shaped concave surface 1 and is a variable diameter arc-shaped surface 1 that can be adapted to press against the outer peripheral wall surface of the column to be sealed.

[0010] The arc-shaped concave surface has an adhesive groove on the side of the variable diameter pad assembly away from the main pad.

[0011] In the present invention, a multi-layered shim structure variable diameter gate front sealing assembly is used in which the main shim plate 1 and the main shim plate 2 tightly bind the rubber body between them, preventing the rubber from flowing out under high temperature and pressure, and ensuring that the arc-shaped concave surface 1 between them can better press and seal the outer peripheral wall of the pipe to be sealed; the variable diameter arc-shaped surface 1 of the semi-annular variable diameter shim plate assembly 1 can adapt to seal pipes of different diameters by changing the diameter, improving applicability; the variable diameter shim plate assembly 1 fits the inner side plate of the main shim plate 1, the structure is stable and not easy to shift; when sealing large-diameter pipes, the rubber extrusion is large, and the rubber receiving groove 1 of the sealing rubber body can accommodate the extruded rubber, preventing the extruded rubber from overflowing and blocking the contact between the variable diameter arc-shaped surface 1 and the outer peripheral wall of the pipe, thereby improving the sealing stability and sealing effect.

[0012] As a further improvement to the above technical solution, the variable diameter pad assembly includes pad one, pad two, and pad three; pad one, pad two, and pad three are all arc-shaped plates and are sequentially movably overlapped or inserted along the length direction to form a semi-circular variable diameter pad assembly.

[0013] The beneficial effects of the above technical solution are: the movable overlapping or plugging structure between pad 1, pad 2 and pad 3 can fill the gap between pads caused by the outward expansion and diameter increase of the pads when sealing larger specification pipe columns, so that the inner peripheral wall of the semi-annular variable diameter pad assembly 1 always fits the outer peripheral wall of the sealing pipe column, preventing the loss of rubber material.

[0014] As a further improvement to the above technical solution, the pad plate two has overlapping steps two at both ends in the length direction; the pad plate one has an overlapping step one near the end of the pad plate two that can be adapted to movably overlap with the overlapping steps two; the pad plate three has an overlapping step three near the end of the pad plate two that can be adapted to movably overlap with the overlapping steps two.

[0015] The beneficial effects of the above technical solution are: when sealing larger-sized tubular columns, pad 1, pad 2, and pad 3 will all move outward to increase the diameter of the inner circumferential wall surface; by designing pad 1 and pad 3 to be connected to pad 2 through an overlapping step structure, pad 2 and adjacent pad 1 and pad 3 can always maintain a layered overlapping contact state, which can prevent rubber loss caused by gaps between pads.

[0016] As a further improvement to the above technical solution, both ends of the second pad have insertion grooves along their length; the first pad has an insertion block one near the end of the second pad that can be adapted to be movably inserted into the insertion groove; the third pad has an insertion block two near the end of the second pad that can be adapted to be movably inserted into the insertion groove.

[0017] The beneficial effects of the above technical solution are as follows: by designing that pad 1 and pad 3 are connected to pad 2 through a plug-in structure, in addition to maintaining the stacked contact state to prevent rubber loss due to gaps between pads, it can also further improve the stability of the connection between pads so that each pad will not tilt and ensure stable sealing performance.

[0018] As a further improvement to the above technical solution, the first pad, the second pad, and the third pad have the same thickness and the top and bottom surfaces correspond to each other.

[0019] As a further improvement to the above technical solution, the outer periphery of pad one, pad two and pad three are all provided with fixing notches or fixing holes.

[0020] The beneficial effects of the above technical solution are: gasket 1, gasket 2 and gasket 3 are embedded in the sealing rubber body, and their fixing notches or fixing holes are filled with rubber body, so that the connection between gasket 1, gasket 2 and gasket 3 and the sealing rubber body is more stable, and the sealing performance is further improved.

[0021] As a further improvement to the above technical solution, it also includes a semi-annular variable diameter pad assembly two, which has the same structure as the variable diameter pad assembly one; the variable diameter pad assembly two is embedded in the front part of the sealing rubber body and is correspondingly attached to the plate surface of the main pad two near the main pad one; the inner peripheral wall of the variable diameter pad assembly two corresponds to the arc concave surface one and is a variable diameter arc surface two that can be adapted to press against the outer peripheral wall of the column to be sealed.

[0022] The arc-shaped concave surface one has an adhesive groove two on the side of the variable diameter pad assembly two away from the main pad two.

[0023] The beneficial effects of the above technical solution are as follows: Under the condition of high temperature and high pressure sealing pipe column, the variable diameter pad assembly one and the variable diameter pad assembly two jointly constrain the rubber body between them, and enable the arc concave surface one between them to better press against the outer peripheral wall of the sealing pipe column; the main pad one and the main pad two press against the outer side plate surface of the corresponding variable diameter pad assembly one and the variable diameter pad assembly two, which plays a further constraining and stabilizing role.

[0024] As a further improvement to the above technical solution, the top surface of the sealing rubber body has a pad embedding groove one, and the bottom surface of the sealing rubber body has a pad embedding groove two; the main pad one and the main pad two are correspondingly fitted and fixed in the pad embedding groove one and the pad embedding groove two.

[0025] The beneficial effects of the above technical solution are: both main pad 1 and main pad 2 are adapted and fixed in the corresponding pad mounting groove 1 and pad mounting groove 2, which improves the structural stability.

[0026] As a further improvement to the above technical solution, both ends of the first main pad and the second main pad in the length direction are bent inwards in opposite directions to embed into the sealing rubber body to form wing-shaped baffles; the other end of the first main pad and the second main pad in the width direction are both formed with guide slopes corresponding to the inner side plate surfaces.

[0027] The beneficial effects of the above technical solution are: the wing-shaped baffle can prevent the rubber at both ends of the sealing rubber body from leaking under high temperature and high pressure conditions; the function of the guide slope is to guide and control the rubber at the rear end of the sealing rubber body to move towards the front end and corresponding to the area between the main pad 1 and the main pad 2 when it is squeezed, thereby promoting the sealing effect between the arc concave surface 1 and the outer peripheral wall of the tube column.

[0028] As a further improvement to the above technical solution, a front sealing positioning pin is also included, which is located behind the sealing rubber body; one end of the front sealing positioning pin near the sealing rubber body is inserted into the interior of the sealing rubber body and corresponds between the first main pad and the second main pad, and is fixedly connected to the first main pad and the second main pad; the end of the front sealing positioning pin away from the sealing rubber body is a connecting end for connecting with the gate body.

[0029] The beneficial effects of the above technical solution are: one end of the front sealing positioning pin used to connect the gate body is inserted into the interior of the sealing rubber body and fixedly connected with the main pad one and the main pad two, which further improves the structural stability of the main pad one and the main pad two, and also improves the connection rigidity between the sealing rubber body and the gate body.

[0030] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a multi-layer shim structure variable diameter gate front sealing assembly, which has the following advantages and beneficial effects:

[0031] 1. The present invention features a wing-shaped baffle structure formed by bending both ends of the main pad 1 and the main pad 2, which can prevent the loss of rubber on both sides of the sealing rubber body under high temperature conditions when sealing the tubing. Furthermore, guide slopes are provided at the rear ends of the main pad 1 and the main pad 2 to facilitate the rubber at the rear ends of the main pad 1 and the main pad 2 to press towards the front end of the sealing tubing.

[0032] 2. The variable diameter gasket assembly 1 and variable diameter gasket assembly 2 of this utility model, which are arranged in layers, can effectively seal pipes of various diameter specifications. Both variable diameter gasket assembly 1 and variable diameter gasket assembly 2 are designed with multiple gaskets arranged in an arc shape and with overlapping or plugging layers between them. This ensures that the inner peripheral wall of the variable diameter gasket assembly is always in close contact with the outer peripheral wall of the pipe when sealing pipes of different diameters, without any gaps. This can effectively prevent the rubber from leaking out of the round hole of the front sealing rod under high temperature and high pressure conditions.

[0033] 3. The multi-layer shim structure of this utility model allows the front sealing assembly of the variable diameter gate to be installed on an existing fixed diameter gate body, directly converting the existing fixed diameter gate assembly into a variable diameter gate assembly. This structure is relatively simple and easy to process, has low manufacturing costs, and provides good sealing performance, thus improving applicability and significantly reducing application costs. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0035] Figure 1 This utility model presents a three-dimensional structural diagram of a variable diameter gate front sealing assembly with a multi-layer pad structure.

[0036] Figure 2 This utility model provides a three-dimensional structural diagram of the sealing rubber body of a variable diameter gate front sealing assembly with a multi-layer pad structure.

[0037] Figure 3 This utility model discloses a three-dimensional structural diagram of the main pad plate one and the main pad plate two of the front sealing assembly of a variable diameter gate with a multi-layer pad structure.

[0038] Figure 4 This utility model discloses a three-dimensional structure of the main pad plate one and the main pad plate two of a variable diameter gate front sealing assembly with a multi-layer pad structure.

[0039] Figure 5This utility model discloses a three-dimensional structural diagram of a variable diameter pad assembly for a multi-layer pad structure variable diameter gate front sealing component.

[0040] Figure 6 This utility model provides a schematic diagram of the two-dimensional structure of the pad plate of a variable diameter gate front sealing assembly with a multi-layer pad iron structure.

[0041] In the diagram: 1. Sealing rubber body; 11. Arc-shaped concave surface one; 111. Adhesive receiving groove one; 112. Adhesive receiving groove two; 12. Gasket embedding groove one; 13. Gasket embedding groove two; 14. Variable diameter gasket assembly embedding groove one; 15. Variable diameter gasket assembly embedding groove two; 2. Main gasket one; 21. Wing-shaped baffle one; 22. Guide slope one; 23. Fixing through hole one; 24. Clearance notch; 3. Main gasket two; 31 1. Wing-shaped baffle 2; 32. Guide slope 2; 33. Fixing through hole 2; 4. Variable diameter pad assembly 1; 41. Pad 1; 411. Overlapping step 1; 42. Pad 2; 421. Overlapping step 2; 43. Pad 3; 431. Overlapping step 3; 44. Variable diameter arc surface 1; 45. Fixing notch or fixing hole; 5. Variable diameter pad assembly 2; 51. Variable diameter arc surface 2; 6. Front sealing positioning pin. Detailed Implementation

[0042] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0043] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] According to the embodiments of this utility model, such as Figures 1 to 6 As shown, a multi-layered shim structure variable diameter gate front sealing assembly includes: a sealing rubber body 1, a main shim 2, a second main shim 3, and a semi-annular variable diameter shim assembly 4.

[0047] The sealing rubber body 1 has an arc-shaped concave surface 11 at the front center for pressing against the outer peripheral wall of the pipe to be sealed; the main pad 2 and the main pad 3 are opposite to each other and are embedded in the front top and bottom surfaces of the sealing rubber body 1; the main pad 2 and the main pad 3 have clearance notches at the middle of one end of the arc-shaped concave surface 11 in the width direction; the variable diameter pad assembly 4 is embedded in the front of the sealing rubber body 1 and is attached to the main pad 2 near the main pad 3; the inner peripheral wall of the variable diameter pad assembly 4 corresponds to the arc-shaped concave surface 11 and is a variable diameter arc-shaped surface 44 that can be adapted to press against the outer peripheral wall of the pipe to be sealed; the arc-shaped concave surface 11 has a rubber groove 111 on the side of the variable diameter pad assembly 4 away from the main pad 2.

[0048] In this embodiment, a multi-layered shim structure variable diameter gate front sealing assembly is used where two sets of variable diameter gate front sealing assemblies cooperate to press and seal the outer peripheral wall of a pipe column. The main shim plate 2 and the main shim plate 3 tightly bind the rubber body between them, preventing rubber leakage under high temperature and pressure, ensuring that the arc-shaped concave surface 11 between them can better press and seal the outer peripheral wall of the pipe column to be sealed. The variable diameter arc-shaped surface 44 of the semi-annular variable diameter shim plate assembly 4 can adapt to seal pipe columns of different diameters through diameter change, improving applicability. The variable diameter shim plate assembly 4 fits the inner side of the main shim plate 2, providing structural stability and preventing displacement. When sealing large-diameter pipe columns, the rubber extrusion is large, and the rubber-containing groove 111 of the sealing rubber body 1 can accommodate the extruded rubber, preventing overflow and obstruction of the variable diameter arc-shaped surface 44 from adhering to the outer peripheral wall of the pipe column, thereby improving sealing stability and sealing effect.

[0049] Specifically, main pad 2 and main pad 3 have the same structure and are both metal plates or alloy plates, such as iron plates, steel plates, or alloy steel plates. The diameter range of the diameter-changing arc surface 44 of the variable diameter pad assembly 4 can be designed as needed; the clearance notches at the front ends of main pad 2 and main pad 3 are both semi-circular notches, and their diameter is greater than or equal to the maximum expansion diameter of the diameter-changing arc surface 44.

[0050] Specifically, the arc-shaped concave surface 11 is a circular arc-shaped concave surface, adapted to fit and seal a circular tube column; for example, the arc-shaped concave surface 11 can be designed as a semi-cylindrical surface. Before use, the arc-shaped concave surface 11 is coaxial and has the same diameter as the variable-diameter arc-shaped surface 44.

[0051] In some embodiments, the variable diameter pad assembly 4 includes pad 41, pad 42 and pad 43; pad 41, pad 42 and pad 43 are all arc-shaped plates and are sequentially movably overlapped or inserted along the length direction to form a semi-circular variable diameter pad assembly 4.

[0052] The movable overlapping or plugging structure between pad 1 (41), pad 2 (42), and pad 3 (43) can fill the gap between pads caused by the outward expansion and diameter increase of the pads when sealing larger diameter pipe columns. This ensures that the inner circumferential wall of the semi-annular variable diameter pad assembly always fits against the outer circumferential wall of the sealing pipe column, preventing the loss of rubber material.

[0053] Specifically, pad 1 (41), pad 2 (42), and pad 3 (43) are all metal or alloy plates with a hardness lower than that of the pipe column to be sealed.

[0054] In some embodiments, pad 2 42 has overlapping steps 2 421 at both ends along its length; pad 1 41 has overlapping steps 1 411 near the end of pad 2 42 that can be adapted to overlap with overlapping steps 2 421; pad 3 43 has overlapping steps 3 431 near the end of pad 2 42 that can be adapted to overlap with overlapping steps 2 421.

[0055] When sealing larger diameter tubular columns, pad 1 41, pad 2 42, and pad 3 43 will all move outward to increase the diameter of the inner circumferential wall. By designing pad 1 41 and pad 3 43 to be connected to pad 2 42 through an overlapping step structure, pad 2 42 can always maintain an overlapping contact with the adjacent pad 1 41 and pad 3 43, which can prevent rubber loss caused by gaps between pads.

[0056] Specifically, pad 1 41, pad 2 42, and pad 3 43 are all arc-shaped sealing plates with the same radius of curvature; the two ends of overlapping step 2 421 extend in the length direction to the two ends of the corresponding pad 2 42 in the radial direction; the two ends of overlapping step 1 411 extend in the length direction to the two ends of the corresponding pad 1 41 in the radial direction; the two ends of overlapping step 3 431 extend in the length direction to the two ends of the corresponding pad 3 43 in the radial direction; the widths of overlapping step 1 411, overlapping step 2 421, and overlapping step 3 431 are the same.

[0057] Specifically, overlapping steps 1 (411), 2 (421), and 3 (431) are all arc-shaped structures with the same radius of curvature as pad 1 (41), pad 2 (42), and pad 3 (43); or overlapping steps 1 (411), 2 (421), and 3 (431) are all square structures of the same size. Overlapping steps 1 (411), 2 (421), and 3 (431) can be integrally formed by extending along the circumferential direction of the corresponding pad 1 (41), pad 2 (42), and pad 3 (43).

[0058] In some embodiments, both ends of the second pad 42 in the length direction have insertion grooves; the first pad 41 near the end of the second pad 42 has a first insertion block that can be adapted to be movably inserted into the insertion groove; the third pad 43 near the end of the second pad 42 has a second insertion block that can be adapted to be movably inserted into the insertion groove.

[0059] By designing pad 1 (41) and pad 3 (43) to pad 2 (42) through a plug-in structure, not only can the stacked contact state be maintained to prevent rubber loss due to gaps between pads, but the stability of the connection between pads can also be further improved so that each pad will not tilt and the sealing performance is stable.

[0060] Specifically, pad 1 41, pad 2 42, and pad 3 43 are all arc-shaped sealing plates with the same radius of curvature; the two sides of the groove corresponding to the width direction of pad 2 42 are open; the two ends of the width direction of plug block 1 extend to the two ends of the radial direction of pad 1 41; the two ends of the width direction of plug block 2 extend to the two ends of the radial direction of pad 3 43.

[0061] Specifically, both plug-in block one and plug-in block two are arc-shaped plug-in blocks with the same radius of curvature as pad one 41, pad two 42, and pad three 43.

[0062] In some embodiments, pad 1 41, pad 2 42 and pad 3 43 have the same thickness and their top and bottom surfaces correspond to each other.

[0063] Specifically, the top surfaces of pad 1 41, pad 2 42 and pad 3 43 are flush; the bottom surfaces of pad 1 41, pad 2 42 and pad 3 43 are flush.

[0064] In some embodiments, the outer periphery of pad 1 41, pad 2 42 and pad 3 43 each has a fixing notch or fixing hole 45.

[0065] Gasket 1 41, Gasket 2 42 and Gasket 3 43 are embedded in the sealing rubber body 1. Their fixing notches or fixing holes 45 are filled with rubber body, so that the connection between Gasket 1 41, Gasket 2 42 and Gasket 3 43 and the sealing rubber body 1 is more stable, and the sealing performance is further improved.

[0066] Specifically, there are multiple fixing notches or fixing holes 45, which are arranged circumferentially along pad 1 41, pad 2 42, and pad 3 43. The vulcanized sealing rubber embedded in the multiple fixing notches or fixing holes 45 can effectively prevent the pads from falling off during repeated use.

[0067] Specifically, the shape of the fixing notch or fixing hole 45 is not limited to an arc shape; it can be a square or a circle, etc.

[0068] In some embodiments, there are multiple pads 42; pad 41, multiple pads 42, and pads 43 are sequentially overlapped or inserted along the length direction to form a semi-circular variable diameter pad assembly.

[0069] The pad 41, multiple pads 42, and pads 43 are arranged in a semi-circular ring through an arc-shaped overlapping structure. When sealing the pipe column, each pad unfolds along the arc-shaped structure and closely adheres to the outer wall of the sealing pipe column. The arc-shaped overlapping structure does not separate, completely enclosing the sealing rubber inside and preventing the rubber from being lost under high temperature and high pressure conditions.

[0070] In some embodiments, a semi-annular variable diameter pad assembly 25 is also included, which has the same structure as the variable diameter pad assembly 4. The variable diameter pad assembly 25 is embedded in the front of the sealing rubber body 1 and is correspondingly attached to the plate surface of the main pad 23 near the main pad 2. The inner peripheral wall of the variable diameter pad assembly 25 corresponds to the arc concave surface 11 and is a variable diameter arc surface 251 that can be adapted to press against the outer peripheral wall of the column to be sealed.

[0071] The arc-shaped concave surface 11 has an adhesive groove 112 on the side of the strain gauge pad assembly 5 away from the main pad 3.

[0072] Under the condition of high temperature and high pressure sealing tube, the variable diameter pad assembly 4 and the variable diameter pad assembly 5 together constrain the rubber body between them, and enable the arc-shaped concave surface 11 between them to better press against the outer peripheral wall of the sealing tube; the main pad 2 and the main pad 3 press against the outer side plate of the corresponding variable diameter pad assembly 4 and the variable diameter pad assembly 5, which plays a further role in constraint and stability.

[0073] Specifically, both the variable diameter pad assembly 4 and the variable diameter pad assembly 5 are semi-circular rings. The surfaces of the main pad 2, the main pad 3, the variable diameter pad assembly 4, and the variable diameter pad assembly 5 are arranged in parallel.

[0074] In some embodiments, a semi-annular variable diameter pad assembly three is also included, which has the same structure as variable diameter pad assembly two 5 and variable diameter pad assembly one 4; the variable diameter pad assembly three is embedded in the front of the sealing rubber body 1 and corresponds to the variable diameter pad assembly one 4 and variable diameter pad assembly two 5; the inner peripheral wall of the variable diameter pad assembly three corresponds to the arc concave surface one 11 and is a variable diameter arc surface three that can be adapted to press against the outer peripheral wall of the column to be sealed.

[0075] Before use, that is, before being subjected to pressure and expansion, the variable diameter arc surface 1 44, the variable diameter arc surface 2 51, and the variable diameter arc surface 3 are coaxially corresponding and are all semi-cylindrical surfaces with the same diameter.

[0076] In some embodiments, there may be multiple variable diameter pad assemblies 3; the multiple variable diameter pad assemblies 3 are arranged parallel to and spaced apart from the variable diameter pad assembly 4 and the variable diameter pad assembly 5 in the opposite direction.

[0077] In some embodiments, the top surface of the sealing rubber body 1 has a pad embedding groove 12, and the bottom surface of the sealing rubber body 1 has a pad embedding groove 13; the main pad 2 and the main pad 3 are fitted and fixed in the pad embedding groove 12 and the pad embedding groove 13 respectively.

[0078] Both main pad 1 2 and main pad 2 3 are fitted and fixed in the corresponding pad mounting groove 1 12 and pad mounting groove 2 13, which improves the structural stability.

[0079] In some embodiments, the gasket insertion groove 12 of the sealing rubber body 1 has a variable diameter gasket assembly insertion groove 14 in the middle; the gasket insertion groove 13 of the sealing rubber body 1 has a variable diameter gasket assembly insertion groove 15 in the middle; the variable diameter gasket assembly 4 and the variable diameter gasket assembly 5 are correspondingly embedded in the variable diameter gasket assembly insertion groove 14 and the variable diameter gasket assembly insertion groove 15.

[0080] In some embodiments, both ends of the first main pad 2 and the second main pad 3 in the length direction are bent inwards in opposite directions to embed into the sealing rubber body 1 to form wing-shaped baffles; the other end of the first main pad 2 and the second main pad 3 in the width direction has a guide slope formed on the inner side plate.

[0081] The wing-shaped baffle can prevent the rubber at both ends of the sealing rubber body 1 from leaking out under high temperature and high pressure conditions; the guide slope can guide and control the rubber at the rear end of the sealing rubber body 1 to move towards the front end and corresponding to the area between the main pad 1 and the main pad 2, thereby promoting the sealing effect between the arc concave surface 11 and the outer peripheral wall of the tube column.

[0082] Specifically, both ends of the main pad 2 in the length direction are bent inward to embed into the sealing rubber body 1 to form a wing-shaped baffle 21; the other end of the main pad 2 in the width direction has a guide slope 22 corresponding to the inner plate surface. Both ends of the main pad 3 in the length direction are bent inward to embed into the sealing rubber body 1 to form a wing-shaped baffle 31; the other end of the main pad 3 in the width direction has a guide slope 32 corresponding to the inner plate surface.

[0083] In some embodiments, a front sealing positioning pin 6 is also included, which is located behind the sealing rubber body 1. The end of the front sealing positioning pin 6 near the sealing rubber body 1 is inserted into the interior of the sealing rubber body 1 and corresponds between the main pad 1 2 and the main pad 2 3, and is fixedly connected to the main pad 1 2 and the main pad 2 3. The end of the front sealing positioning pin 6 away from the sealing rubber body 1 is a connection end for connecting with the gate body.

[0084] One end of the front sealing positioning pin 6 used to connect the gate body is inserted into the interior of the sealing rubber body 1 and fixedly connected to the main pad 1 2 and the main pad 2 3, which further improves the structural stability of the main pad 1 2 and the main pad 2 3, and also improves the connection rigidity between the sealing rubber body 1 and the gate body.

[0085] Specifically, the main pad 2 has a fixing through hole 23 on its surface; the main pad 3 has a fixing through hole 33 on its surface; the main pad 2 is fastened to the front sealing positioning pin 6 by screws passing through the fixing through hole 23; or, the main pad 2 is welded to the front sealing positioning pin 6 by connecting rods passing through the fixing through hole 23. The main pad 3 is fastened to the front sealing positioning pin 6 by screws passing through the fixing through hole 33; or, the main pad 3 is welded to the front sealing positioning pin 6 by connecting rods passing through the fixing through hole 33.

[0086] Specifically, during manufacturing, the sealing rubber body 1 is fixed to the main pad 1 2, the main pad 2 3, the variable diameter pad assembly 1 4, the variable diameter pad assembly 2 5, and the front sealing positioning pin 6 by vulcanization.

[0087] The specific working process is as follows: When sealing the tubing, the variable diameter gasket assembly 4, variable diameter gasket assembly 5, and variable diameter gasket assembly 3, after contacting the tubing, will be offset circumferentially along the arc-shaped overlapping structure, but the arc-shaped overlapping structure between the gaskets will still overlap together, thus achieving sealing of tubing with different diameters. When sealing large-diameter tubing, the rubber extrusion amount on the semi-circular sealing surface at the front end of the sealing rubber is large, but a rubber-receiving groove structure is set at the front end of the sealing rubber to accommodate the extruded and deformed rubber. The front ends of the multiple variable diameter gasket assemblies always tightly hug the outer circle of the tubing when sealing tubing with different diameters, without gaps, preventing the rubber at the front end of the sealing rubber from flowing out under high-temperature conditions, thus achieving tubing sealing under high-temperature conditions. The main gasket has arc-shaped wing-shaped baffles 1 and wing-shaped baffles 2 at both ends, which can prevent the rubber from flowing out on both sides of the sealing rubber body under high-temperature conditions, improving the high-temperature stability of the front sealing assembly. Each pad has multiple arc-shaped fixing holes at its rear end. The vulcanized sealing rubber enters the fixing holes, which can effectively prevent the pad from falling off after repeated use.

[0088] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0089] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A multi-layered shim structure for the front sealing assembly of a variable-diameter gate, characterized in that, include: The sealing rubber body (1) has an arc-shaped concave surface (11) at the front end of the middle part for pressing against the outer peripheral wall of the column to be sealed; Main pad 1 (2) and main pad 2 (3); the main pad 1 (2) and the main pad 2 (3) are opposite to each other and are embedded in the front top and bottom surfaces of the sealing rubber body (1); the main pad 1 (2) and the main pad 2 (3) have a clearance notch at the middle of one end in the width direction corresponding to the arc concave surface 1 (11); A semi-annular variable diameter gasket assembly (4) is embedded in the front part of the sealing rubber body (1) and correspondingly attached to the plate surface of the main gasket (2) near the main gasket (3); the inner peripheral wall of the variable diameter gasket assembly (4) corresponds to the arc concave surface (11) and is a variable diameter arc surface (44) that can be adapted to press against the outer peripheral wall of the column to be sealed. The arc-shaped concave surface (11) has an adhesive groove (111) on the side of the variable diameter pad assembly (4) away from the main pad (2).

2. The multi-layer pad structure variable diameter gate front sealing assembly according to claim 1, characterized in that, The variable diameter pad assembly (4) includes pad one (41), pad two (42) and pad three (43); pad one (41), pad two (42) and pad three (43) are all arc-shaped plates and are sequentially movably overlapped or inserted along the length direction to form a semi-circular variable diameter pad assembly.

3. The multi-layer pad structure variable diameter gate front sealing assembly according to claim 2, characterized in that, The second pad (42) has overlapping steps (421) at both ends along its length; the first pad (41) has an overlapping step (411) near the end of the second pad (42) that can be adapted to overlap with the overlapping step (421); the third pad (43) has an overlapping step (431) near the end of the second pad (42) that can be adapted to overlap with the overlapping step (421).

4. The multi-layer shim structure variable diameter gate front sealing assembly according to claim 2, characterized in that, The second pad (42) has insertion slots on both ends of the pad in the length direction; the first pad (41) has an insertion block one near the end of the second pad (42) that can be adapted to be movably inserted into the insertion slot; the third pad (43) has an insertion block two near the end of the second pad (42) that can be adapted to be movably inserted into the insertion slot.

5. The multi-layer pad structure variable diameter gate front sealing assembly according to claim 2, characterized in that, The first pad (41), the second pad (42), and the third pad (43) have the same thickness and their top and bottom surfaces correspond to each other.

6. The multi-layer pad structure variable diameter gate front sealing assembly according to claim 2, characterized in that, The outer periphery of the first pad (41), the second pad (42), and the third pad (43) all have fixing notches or fixing holes.

7. The multi-layer pad structure variable diameter gate front sealing assembly according to claim 2, characterized in that, It also includes a semi-annular variable diameter pad assembly two (5), which has the same structure as the variable diameter pad assembly one (4); the variable diameter pad assembly two (5) is embedded in the front part of the sealing rubber body (1) and is attached to the main pad two (3) near the main pad one (2); the inner peripheral wall of the variable diameter pad assembly two (5) corresponds to the arc concave surface one (11) and is a variable diameter arc surface two that can be adapted to press against the outer peripheral wall of the column to be sealed. The arc-shaped concave surface 1 (11) has an adhesive groove 2 (112) on the side of the variable diameter pad assembly 2 (5) away from the main pad 2 (3).

8. The multi-layer shim structure variable diameter gate front sealing assembly according to claim 1, characterized in that, The top surface of the sealing rubber body (1) has a pad embedding groove one (12), and the bottom surface of the sealing rubber body (1) has a pad embedding groove two (13); the main pad one (2) and the main pad two (3) are fitted and fixed in the pad embedding groove one (12) and the pad embedding groove two (13) respectively.

9. The multi-layer pad structure variable diameter gate front sealing assembly according to claim 8, characterized in that, Both ends of the first main pad (2) and the second main pad (3) in the length direction are bent inwards in opposite directions to embed into the sealing rubber body (1) to form wing-shaped baffles; the other end of the first main pad (2) and the second main pad (3) in the width direction are formed with guide slopes corresponding to the inner side plate surface.

10. The multi-layer shim structure variable diameter gate front sealing assembly according to claim 1, characterized in that, It also includes a front sealing positioning pin (6), which is located behind the sealing rubber body (1); one end of the front sealing positioning pin (6) near the sealing rubber body (1) is inserted into the interior of the sealing rubber body (1) and corresponds to the main pad one (2) and the main pad two (3), and is fixedly connected to the main pad one (2) and the main pad two (3); the end of the front sealing positioning pin (6) away from the sealing rubber body (1) is a connecting end for connecting with the gate body.

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