A high pressure rotary connection

Abstract

The utility model discloses a high pressure rotary connection device, including main part and mandril, the inner wall of main part is provided with three stages steps, and the combination sealing element is provided with between mandril and first stage step, and the fixed ring is provided with between second and third stage steps, and the inclined plane is formed between first stage and second stage steps, the combination sealing element includes the sealing ring and the support copper pad who set up in proper order closely, and the support copper pad partial structure extends to the inclined plane and forms the support portion closely adhering to the inclined plane, the inner wall surface of fixed ring is closely adhered to mandril step type outer wall surface and baffle ring outer wall surface respectively, and the outer wall surface of fixed ring is closely adhered to support copper pad outer wall surface and second and third stage step face respectively in proper order, the baffle ring is limited through the inner wall surface of fixed ring and the bearing setting outside mandril, and the inner end portion of baffle ring just cooperates and is set in the recess of mandril outer wall surface, and the bearing is fixed through end cover limit. The utility model discloses whole structure occupies little space, and the part quantity is few, and the installation and removal are all convenient.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling and production technology. More specifically, this utility model relates to a high-pressure rotary connection device. Background Technology

[0002] High-pressure rotary couplings play a crucial role in oil and gas field fracturing operations, primarily used to achieve dynamic sealing of high-pressure fluids during coiled tubing pumping. The fixed end of the rotary coupling connects to an external high-pressure manifold, while the rotating end connects to a drum spindle. Due to limited installation space within the drum, the rotary coupling must be compact, with smaller dimensions being preferable. Currently available U-shaped ball-track rotary couplings occupy significant space, have numerous parts, and are inconvenient to install and disassemble. Furthermore, the U-shaped structure easily leads to uneven loading, causing uneven stress on the ball track and resulting in wear on the ball track and seals, thus affecting service life. Therefore, this application proposes an L-shaped high-pressure rotary coupling to address the aforementioned technical problems. Utility Model Content

[0003] One objective of this invention is to provide a high-pressure rotary connection device that solves the problems of current U-shaped ball track rotary connection devices, such as large space occupation, numerous parts, inconvenient installation and disassembly, and easy occurrence of uneven load, causing ball track wear and affecting service life.

[0004] To address the aforementioned technical problems, this utility model provides a high-pressure rotary connection device, comprising a fixed body and a rotating mandrel. The body is L-shaped with corresponding L-shaped flow channel holes inside. The mandrel fits into the horizontal portion of the flow channel holes. The inner wall of the horizontal portion of the flow channel holes has three steps. A combined sealing element is provided between the mandrel and the first step. A fixing ring is provided between the mandrel and the second and third steps. The connection surface between the first and second steps is an inclined surface. The combined sealing element includes a sealing ring and a supporting copper pad arranged in close contact. The supporting copper pad extends towards the inclined surface to form a supporting part that is tightly attached to the inclined surface; both the inner and outer walls of the fixing ring are stepped, with the inner wall of the fixing ring tightly attached to the stepped outer wall of the mandrel and the outer wall of the retaining ring, and the outer wall of the fixing ring tightly attached to the outer wall of the supporting copper pad and the second and third stepped surfaces, respectively; the retaining ring is limited by the inner wall of the fixing ring and the bearing located outside the mandrel, and the inner end of the retaining ring is precisely fitted into the groove of the outer wall of the mandrel; the bearing is limited and fixed by the end cap, which is fixed to the mandrel and the outer wall of the main body.

[0005] Preferably, a friction-reducing ring is provided between the inner wall surface of the main body and the outer wall surface of the fixing ring, and a friction-reducing ring is also provided between the end cap and the mandrel.

[0006] Preferably, the main body has a protrusion at the junction of the horizontal and vertical portions to form a vertical limiting surface, and the end of the mandrel is located behind the vertical limiting surface.

[0007] Preferably, the outer wall surface of the mandrel that contacts the combined seal is provided with an alloy coating, and the corresponding inner wall surface of the main body is also provided with an alloy coating.

[0008] Preferably, the retaining ring comprises at least two retaining ring units.

[0009] Preferably, the end cap is connected to the body by a thread.

[0010] Preferably, the outer end of the mandrel is provided with a connector, which is a structure in which one end of the sleeve structure is recessed inward to form a concave channel. The connector is sleeved on the outer end of the mandrel, and two sealing rings are provided at intervals on the inner wall of the concave channel of the connector.

[0011] This utility model has at least the following beneficial effects: 1. The connecting device of this utility model adopts an L-shape, which makes the overall structure occupy less space and has fewer parts. It is easy to install and disassemble. Except for the end cover, the other parts such as the seal, fixing ring, and retaining ring only need to be assembled. They are not directly connected to the main body and the spindle. Therefore, the spindle will not affect the tightness of the fixing ring, seal and other parts or cause wear during rotation. It is also easy to disassemble later.

[0012] 2. The horizontal part of the mandrel mounting hole (i.e., the flow channel hole) and the corresponding outer wall surface of the mandrel in the main body of this utility model are coated with an alloy to improve hardness, enhance wear resistance, and extend service life.

[0013] 3. The combined sealing component between the main body and the spindle of this utility model not only includes a conventional sealing ring, but also includes a support copper pad with an inclined surface, which enhances the support force, slows down the deformation of the rubber component, and improves the service life of the rubber component.

[0014] 4. The present invention has a vertical limiting surface on the main body, which restricts the position of the mandrel end. On the one hand, it facilitates installation and positioning, and on the other hand, it can prevent fluid from scouring the seal, thus avoiding damage and failure of the seal, affecting the sealing effect or requiring frequent replacement.

[0015] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2This is an enlarged view of the end of the connection between the main body and the mandrel of this utility model; Figure 3 This is a schematic diagram of the mandrel of this utility model.

[0017] Explanation of reference numerals in the attached figures: 1. Main body, 2. Mandrel, 3. Sealing ring, 4. Supporting copper pad, 5. Fixing ring, 6. Retaining ring, 7. Bearing, 8. End cap, 9. Alloy coating, 10. Anti-friction ring, 11. Limiting surface, 12. Inclined surface, 13. Flow channel hole, 14. Connecting piece, 15. Sealing ring. Detailed Implementation

[0018] To better understand the purpose, structure, and function of this utility model, the following detailed description is provided in conjunction with the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0019] It should be noted that in the description of this utility model, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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.

[0020] like Figures 1 to 3 As shown, this utility model provides a high-pressure rotary connection device, including a main body 1 of the fixed part and a spindle 2 of the rotating part. The main body is L-shaped and has an L-shaped flow channel hole 13 correspondingly arranged inside. The spindle is fitted into the horizontal part of the flow channel hole. The inner wall of the horizontal part of the flow channel hole is provided with three steps. A combined sealing element is provided between the spindle and the first step. A fixing ring 5 is provided between the spindle and the second and third steps. The connecting surface between the first step and the second step is an inclined surface 12. The combined sealing element includes a sealing ring 3 and a supporting copper pad 4 arranged in close contact. The supporting copper pad structure extends towards the inclined surface to form a support part that is tightly attached to the inclined surface; both the inner and outer walls of the fixing ring are stepped, with the inner wall of the fixing ring tightly attached to the stepped outer wall of the mandrel and the outer wall of the retaining ring 6, and the outer wall of the fixing ring tightly attached to the outer wall of the supporting copper pad and the second and third stepped surfaces, respectively; the retaining ring is limited by the inner wall of the fixing ring and the bearing 7 located outside the mandrel, and the inner end of the retaining ring is precisely fitted into the groove of the outer wall of the mandrel; the bearing is limited and fixed by the end cap 8, which is fixed to the mandrel and the outer wall of the main body.

[0021] like Figure 3As shown, this is the mandrel structure of this application. The left side of the outer wall has a protrusion forming a stepped surface for tightly fitting and fixing the retaining ring, and also has a groove for fixing and retaining the retaining ring. Figure 1 As shown, the main body is the fixed part, and the mandrel is the rotating part. The main body is L-shaped with interfaces at both ends. The core of the main body has an L-shaped flow channel hole, and the upper end is the end connection interface. The right end of the main body has a mandrel mounting hole. After the mandrel is fitted with the combined seal, it is connected to the main body and then positioned by a retaining ring and a retaining ring. The mandrel is installed inside the main body, and a combined seal is installed between the main body and the mandrel to seal the fluid. The combined seal installed between the main body and the mandrel includes a supporting copper pad and a specially made rubber sealing ring. The supporting copper pad protrudes to form a support part with a beveled structure. The corresponding main body also has a bevel, thereby enhancing the support force. The supporting copper pad has both a certain degree of plasticity and better wear resistance than the rubber ring. A retaining ring is installed inside the main body. The retaining ring has a beveled structure and contacts the beveled surface of the supporting copper pad of the combined seal. The retaining ring is not connected to the main body, but is only installed. It does not interfere with the mandrel's sometimes clockwise and sometimes counterclockwise rotation during operation, and it also protects the combined seal to avoid excessive wear, while also facilitating disassembly. The bearing mounted on the mandrel can be a thrust self-aligning roller bearing, allowing the mandrel to rotate.

[0022] In another technical solution, a friction-reducing ring 10 is also provided between the inner wall surface of the main body and the outer wall surface of the fixing ring, and a friction-reducing ring is also provided between the end cap and the spindle.

[0023] In another technical solution, the main body has a protrusion at the junction of the horizontal and vertical portions to form a vertical limiting surface 11, and the end of the mandrel is located behind the vertical limiting surface. The setting of the vertical limiting surface restricts the position of the end of the mandrel, which on the one hand facilitates installation and positioning, and on the other hand prevents fluid from eroding the seal, avoiding frequent damage and failure of the seal, affecting the sealing effect or requiring frequent replacement.

[0024] In another technical solution, the outer wall surface of the mandrel that contacts the combined seal is provided with an alloy coating 9, and the corresponding inner wall surface of the main body is also provided with an alloy coating 9. The presence of an alloy coating on the outer circular surface of the mandrel that contacts the combined seal, and on the inner wall surface of the main body, can improve hardness, enhance wear resistance, and extend service life.

[0025] In another technical solution, the retaining ring is composed of at least two retaining ring units, which facilitates installation and disassembly. Generally, it is composed of two semi-circular retaining ring units.

[0026] In another technical solution, the end cap is threadedly connected to the body. The end cap, mounted externally on the thrust self-aligning roller shaft, is threadedly connected to the body.

[0027] In another technical solution, a connector 14 is provided at the outer end of the mandrel. This connector has a recessed channel formed by one end face of a sleeve structure. The connector is sleeved on the outer end of the mandrel. Two O-rings 15 are spaced apart on the inner wall of the recessed channel of the connector. The connector mates with the roller mandrel and is fixedly connected by bolts.

[0028] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model, and other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and examples shown and described herein.

Claims

1. A high-pressure rotary connection device, characterized in that, The device includes a fixed body and a rotating mandrel. The body is L-shaped and has an L-shaped flow channel hole inside. The mandrel fits into the horizontal part of the flow channel hole. The inner wall of the horizontal part of the flow channel hole has three steps. A combined seal is provided between the mandrel and the first step. A fixing ring is provided between the mandrel and the second and third steps. The connection surface between the first and second steps is an inclined surface. The combined seal includes a sealing ring and a supporting copper pad that are arranged in close contact. The structure of the supporting copper pad extends towards the inclined surface. The support portion is formed to closely adhere to the inclined surface; both the inner and outer walls of the fixing ring are stepped, with the inner wall of the fixing ring closely adhering to the stepped outer wall of the mandrel and the outer wall of the retaining ring, and the outer wall of the fixing ring sequentially adhering to the outer wall of the supporting copper pad and the second and third stepped surfaces; the retaining ring is limited by the inner wall of the fixing ring and the bearing located outside the mandrel, and the inner end of the retaining ring is precisely fitted into the groove of the outer wall of the mandrel; the bearing is limited and fixed by the end cap, which is fixed to the mandrel and the outer wall of the main body.

2. The high-pressure rotary connection device as described in claim 1, characterized in that, A friction-reducing ring is also provided between the inner wall surface of the main body and the outer wall surface of the fixing ring, and a friction-reducing ring is also provided between the end cap and the spindle.

3. The high-pressure rotary connection device as described in claim 1, characterized in that, The main body has a protrusion at the junction of the horizontal and vertical parts to form a vertical limiting surface, and the end of the mandrel is located behind the vertical limiting surface.

4. The high-pressure rotary connection device as described in claim 1, characterized in that, The outer wall surface of the mandrel that contacts the combined seal is provided with an alloy coating, and the corresponding inner wall surface of the main body is also provided with an alloy coating.

5. The high-pressure rotary connection device as described in claim 1, characterized in that, The retaining ring is composed of at least two retaining ring units.

6. The high-pressure rotary connection device as described in claim 1, characterized in that, The end cap is connected to the body by threads.

7. The high-pressure rotary connection device as described in claim 1, characterized in that, The outer end of the mandrel is provided with a connector, which is a structure in which one end of the sleeve structure is recessed inward to form a concave channel. The connector is sleeved on the outer end of the mandrel, and two sealing rings are provided at intervals on the inner wall of the concave channel of the connector.

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