A rotating rubber core

Abstract

The utility model discloses a kind of rotating rubber cores, it is related to rubber product technical field, including rubber material, flange and multiple bolts, still include several supporting ribs. All supporting ribs top is connected to flange;All supporting ribs are located in rubber material, and are combined with rubber material by vulcanization technology;Supporting rib is elastomer, and its hardness, modulus are higher than the hardness, modulus of rubber material respectively.The scheme adds supporting rib in the inside of rubber material, rubber material is in motion, supporting rib is also in motion, and rubber material is greatly deformed, supporting rib is small deformation, supporting rib can support the rubber of rubber material supporting end, prolongs service life.

Description

Technical Field

[0001] This utility model relates to the field of rubber product technology, and in particular to a rotating rubber core. Background Technology

[0002] Figure 1 The longitudinal section of a rotating rubber core includes a rubber compound 11, a flange 12, and multiple bolts 13. The two ends of the rubber compound 11 are a support end and a sealing end, respectively, and the inner and outer diameters of the support end are larger than the inner and outer diameters of the sealing end, respectively. The lower inner end of the bolt 13 is connected to the support end of the rubber compound 11 through the flange 12, and the upper end of the bolt 13 is connected to the blowout preventer device.

[0003] The principle of achieving well pressure sealing by rotating rubber core is: the inner diameter of the sealing end is smaller than the outer diameter of the drill pipe. When there is well pressure, the inner diameter of the support end shrinks under the pressure of the well pressure. At this time, the support end and the sealing end form a sufficiently long sealing surface to achieve sealing.

[0004] During the drill pipe lowering stage, the rubber compound 11 is subjected to downward frictional force, and at this time, the rubber compound 11 is in an axial tensile state; during the drill pipe pulling stage, the rubber compound 11 is subjected to upward frictional force, and at this time, the rubber compound 11 is in an axial compressive state. Therefore, after repeated drilling and pulling of the drill pipe, the rubber compound 11 will experience rubber wear fatigue and become loose.

[0005] Adjacent drill pipes are connected by a joint, and the outer diameter of the joint is larger than the outer diameter of the drill pipe. During well pressure sealing, stress is concentrated at the support end of the rubber compound 11. Therefore, under the combined forces of tension and compression, stress concentration, and the drill pipe joint, the rubber at the support end of the rubber compound 11 will fold outward. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a rotating rubber core that extends the service life of the rubber core.

[0007] In order to achieve the purpose of this utility model, the following solution is proposed: A rotating rubber core includes a rubber compound, a flange, and multiple bolts, as well as several support ribs.

[0008] All support ribs are connected to the flange at the top; All the supporting ribs are located inside the rubber compound and are bonded to the rubber compound through vulcanization technology; The supporting ribs are elastic bodies, and their hardness and modulus are higher than those of the rubber compound.

[0009] Furthermore, the hardness of the rubber compound is 60 Shore A to 80 Shore A, and the 100% modulus is 3 MPa to 6 MPa.

[0010] Furthermore, the support ribs have a hardness greater than 80 Shore A and a 100% modulus greater than 6 MPa.

[0011] Furthermore, the supporting ribs are distributed in several rings.

[0012] Furthermore, the supporting ribs are columnar and distributed in a circumferential array.

[0013] Furthermore, the supporting ribs are circular in shape and have multiple cuts at preset positions.

[0014] Furthermore, the support ribs are perpendicular to the flange.

[0015] Furthermore, in the direction from the rubber material support end to the sealing end, the support ribs are inclined outwards at an angle of less than 45°.

[0016] Furthermore, the support ribs are connected to the flange by thread or interference fit.

[0017] The beneficial effects of this utility model are as follows: By adding supporting ribs inside the rubber compound, the supporting ribs also move when the rubber compound moves. Moreover, the rubber compound deforms greatly while the supporting ribs deform little. The supporting ribs can support the rubber at the supporting end of the rubber compound, thus extending its service life. Attached Figure Description

[0018] Figure 1 This is a longitudinal section of a rotating rubber core in the prior art; Figure 2 This is a schematic diagram of the rotating rubber core in Example 1; Figure 3 This is a diagram showing the distribution of the support reinforcement in Example 1; Figure 4 This is a diagram showing the distribution of the support reinforcement in Example 2; Figure 5 This is a diagram showing the inclined state of the support rib in Example 3; Figure 6 This is a diagram showing the inclined state of the support rib in Example 4. Detailed Implementation

[0019] Example 1 like Figure 2 As shown, this embodiment provides a rotating rubber core, including a rubber compound 11, a flange 12, multiple bolts 13, and multiple support ribs 14.

[0020] Specifically, the two ends of the rubber compound 11 are a support end and a sealing end, respectively, and the inner diameter and outer diameter of the support end are larger than the inner diameter and outer diameter of the sealing end, respectively. The lower end of the bolt 13 is connected to the support end of the rubber compound 11 through the flange 12, and the upper end of the bolt 13 is connected to the blowout preventer equipment.

[0021] Specifically, the support ribs 14 are perpendicular to the flange 12, and the tops of all support ribs 14 are connected to the flange 12. The support ribs 14 are connected to the flange 12 by threads or interference fit.

[0022] Specifically, all the support ribs 14 are located inside the rubber compound 11, and the support ribs 14 are bonded to the rubber compound 11 through vulcanization technology.

[0023] Specifically, such as Figure 3 As shown, the support ribs 14 are columnar, and the support ribs 14 are distributed in three rings. The support ribs 14 in each ring are arranged in a circumferential array, and the number of support ribs 14 in each ring is the same.

[0024] Specifically, the support rib 14 is an elastomer with a hardness and modulus higher than those of the rubber compound 11. For example, the hardness of the rubber compound 11 is 60 Shore A to 80 Shore A, and its 100% modulus is 3 MPa to 6 MPa; the support rib 14 has a hardness greater than 80 Shore A and a 100% modulus greater than 6 MPa.

[0025] More specifically, the support rib 14 can be made of thermosetting elastomer, such as rubber with a hardness and modulus higher than that of rubber compound 11.

[0026] More specifically, the support rib 14 can be made of thermoplastic elastomer, such as nylon or polyurethane.

[0027] Three points need to be explained here: First, when there is well pressure, the rubber at the support end of the rubber compound 11 moves inward. Due to the action of the support rib 14, the movement of the rubber at the support end is hindered. Compared with the traditional rubber core, the force of the rubber compound 11 in this embodiment to hold the drill rod is smaller, which is conducive to the drill rod passing smoothly through the rubber core for drilling and drilling.

[0028] Secondly, after the drill rod is repeatedly pulled up and pulled down, the rubber of the rubber compound 11 wears and becomes fatigued and loose. The function of the support rib 14 is to support the rubber at the support end of the rubber compound 11 and extend its service life.

[0029] Third, after the support rib 14 is connected to the flange 12, the support rib 14 is brushed with adhesive and then placed into the mold to vulcanize together with the rubber.

[0030] Fourth, because the support rib 14 is an elastic body, when the rubber compound 11 moves, the support rib 14 also moves. Moreover, the rubber compound 11 deforms greatly while the support rib 14 deforms little. Therefore, the support rib 14 is not a foreign object inside the rubber compound 11. During the movement, the support rib 14 will not cause shearing to the rubber of the rubber compound 11.

[0031] Example 2 like Figure 4As shown, this embodiment provides a rotating core with the same basic structure as Embodiment 1. The difference is that the support ribs 14 are columnar, and the support ribs 14 are distributed in two rings. The support ribs 14 of the outer ring are arranged in groups of two and are distributed in a circumferential array. The support ribs 14 of the inner ring are arranged in groups of one and are distributed in a circumferential array.

[0032] Example 3 like Figure 5 As shown, this embodiment provides a rotating rubber core with the same basic structure as Embodiment 1. The difference is that the support rib 14 is annular and has multiple cuts at preset positions. The cuts facilitate the flow of the rubber material 11 during deformation.

[0033] Example 4 like Figure 6 As shown, this embodiment provides a rotating rubber core with the same basic structure as Embodiment 1, except that the support rib 14 is inclined outwards from the support end of the rubber material 11 to the sealing end, with an inclination angle R less than 45°. The inclination angle R should not be too large, otherwise the support rib 14 will deviate too far from the stress concentration area.

[0034] The above embodiments are only used to illustrate the technical concept and features of this utility model, and are not intended to be unique or to limit this utility model. Those skilled in the art should understand that various changes or equivalent substitutions made to this utility model without departing from its scope are all within the protection scope of this utility model.

Claims

1. A rotating rubber core, comprising rubber compound (11), flange (12), and a plurality of bolts (13), characterized in that, It also includes several supporting ribs (14); All the support ribs (14) are connected to the flange (12) at the top. All the supporting ribs (14) are located inside the rubber compound (11) and are bonded to the rubber compound (11) by vulcanization technology; The supporting rib (14) is an elastic body, and its hardness and modulus are higher than those of the rubber compound (11).

2. The rotating rubber core according to claim 1, characterized in that, The rubber compound (11) has a hardness of 60 Shore A to 80 Shore A and a 100% modulus of 3 MPa to 6 MPa.

3. The rotating rubber core according to claim 1, characterized in that, The supporting ribs (14) have a hardness greater than 80 Shore A and a 100% modulus greater than 6 MPa.

4. The rotating rubber core according to claim 1, characterized in that, The supporting ribs (14) are distributed in several rings.

5. The rotating rubber core according to claim 4, characterized in that, The supporting ribs (14) are columnar and distributed in a circumferential array.

6. The rotating rubber core according to claim 4, characterized in that, The supporting rib (14) is circular and has multiple cuts at a preset position.

7. The rotating rubber core according to claim 1, characterized in that, The support rib (14) is perpendicular to the flange (12).

8. The rotating rubber core according to claim 1, characterized in that, From the support end of the rubber compound (11) to the sealing end, the support rib (14) is inclined outward with an inclination angle of less than 45°.

9. The rotating rubber core according to claim 1, characterized in that, The support rib (14) is connected to the flange (12) by means of thread or interference fit.

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