Packing sealing structure of faucet for petroleum drilling

Abstract

The utility model provides a packing sealing structure of a faucet for petroleum drilling, which relates to the technical field of petroleum drilling and comprises a slurry pipe, a packing box is sleeved on the slurry pipe, the upper end portion of the slurry pipe is connected with a gooseneck pipe of the faucet through an upper sealing assembly, and the lower end face of the outer circle of the packing box is connected with a center pipe of the faucet through a lower sealing assembly. The upper end of the packing box enables the packing box and the slurry pipe to be sealed in a pressurized mode through a middle sealing assembly. The self-adjusting packing is simple and practical in structure and reasonable in stress, after the structure is improved through a plurality of sealing pieces, the pressing force of the packing can be automatically adjusted according to the working pressure, operation is convenient, the assembling requirement is low, meanwhile, the sealing effect can be improved, and the service life of the packing can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling technology, and more specifically, to a packing seal structure for an oil drilling water tap. Background Technology

[0002] Current oil drilling faucets all utilize packing, but their sealing structures currently suffer from several problems. Most packing boxes are one-piece designs, containing components such as gaskets, packing, bushings, and lower pressure rings. The mud pipe passes through the gaskets, packing, and bushings, relying on the threaded engagement of the lower nut with the faucet's central tube to compress the packing and improve the seal. However, this structure requires high pre-pressure from the packing, which can damage it during use and reduce its lifespan. Therefore, a new technical solution is needed to address these issues. Utility Model Content

[0003] The purpose of this utility model is to provide a packing seal structure for a water tap in oil drilling, so as to solve one or more problems mentioned in the background art.

[0004] To achieve the above objectives, this application provides a packing seal structure for a water tap in oil drilling, including a mud pipe, a packing box fitted on the mud pipe, the upper end of the mud pipe being connected to the gooseneck of the water tap via an upper sealing component, the lower end face of the outer circle of the packing box being connected to the center tube of the water tap via a lower sealing component, and the upper end of the packing box being pressurized and sealed to the mud pipe via a middle sealing component.

[0005] As a preferred embodiment, the upper sealing assembly includes an upper nut and an upper pressure ring. The upper nut is threaded to the gooseneck tube, and the upper end of the mud tube is inserted into the interior of the upper pressure ring. The upper pressure ring is pressed tightly against the end face of the gooseneck tube by the upper nut.

[0006] As a preferred embodiment, the upper end face and the inner hole of the upper pressure ring are respectively provided with a first groove and a second groove, and a first sealing ring and a second sealing ring are respectively installed in the first groove and the second groove.

[0007] As a preferred embodiment, the inner hole of the upper pressure ring is also provided with an inner spline-shaped tooth, the upper end of the mud pipe is provided with an outer spline-shaped tooth and a wire retaining ring groove, the outer spline-shaped tooth of the upper end of the mud pipe is inserted into the inner spline-shaped tooth groove of the upper pressure ring, and the wire retaining ring is installed in the wire retaining ring groove of the mud pipe.

[0008] As a preferred embodiment, the lower sealing assembly includes a lower nut and a lower pressure ring. The lower nut is connected to the central tube of the faucet via a trapezoidal thread. The lower end face and outer circular face of the lower pressure ring are respectively provided with a third groove and a fourth groove. The third sealing ring and the fourth sealing ring are respectively installed in the third groove and the fourth groove.

[0009] As a preferred implementation method, both the lower outer circle and the lower inner circle of the packing box are provided with stepped surfaces. The lower nut applies axial clamping force by screwing onto the stepped surface of the outer circle of the packing box, and transmits it to the lower pressure ring through the stepped surface of the inner hole, so that the lower end face of the lower pressure ring is pressed against the end face of the faucet center tube.

[0010] As a preferred embodiment, the intermediate sealing assembly includes an intermediate pressure ring and a clamping nut. The intermediate pressure ring is sleeved on the outer circle of the mud pipe, and the outer circle of the intermediate pressure ring is in contact with the inner circle of the packing box. The upper end of the outer circle of the packing box is provided with an external thread, and the clamping nut is provided with an internal thread that mates with the external thread and is screwed onto the packing box.

[0011] As a preferred embodiment, the packing box includes a gasket and a bushing. Several packing rings are provided between the middle pressure ring and the lower pressure ring, and the bushings are provided between adjacent packing rings. A gasket is provided between the packing ring closest to the lower pressure ring and the lower pressure ring. Each bushing has a fifth groove on its outer surface, and a fifth sealing ring is installed in each fifth groove. The gasket also has a sixth groove on its outer surface, and a sixth sealing ring is installed in the sixth groove. The clamping nut clamps the middle pressure ring, packing ring, and bushing ring sequentially by the thread engagement force with the packing box until the clamping force is applied to the inner step of the packing box.

[0012] As a preferred embodiment, there are radial gaps between the outer circle of the mud pipe and the inner holes of the intermediate pressure ring, liner ring, gasket ring, and lower pressure ring, and there are axial gaps between the intermediate pressure ring, liner ring, gasket ring, and lower pressure ring.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This utility model has a simple and practical structure with reasonable stress distribution. By using multiple sealing elements to improve the structure, it can automatically adjust the packing clamping force according to the working pressure. This not only makes it easy to operate and reduces assembly requirements, but also improves the sealing effect and extends the service life of the packing. Attached Figure Description

[0015] Figure 1 A schematic diagram of a packing seal structure for a water tap used in oil drilling provided by this utility model;

[0016] Figure 2 This is a partially enlarged view of the packing seal structure of a water tap for oil drilling provided by this utility model. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] It should be noted that all uses of "first", "second", "third" and "fourth" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first", "second", "third" and "fourth" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0019] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "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 limiting the scope of protection of this utility model.

[0020] like Figure 1-2 As shown, this utility model provides a packing seal structure for a water tap in oil drilling, including a mud pipe 6, an upper nut 1, an upper pressure ring 4, a clamping nut 7, a middle pressure ring 8, a packing 10, a bushing 11, a washer 12, a packing box 13, a lower nut 15, and a lower pressure ring 16. The packing box 13 is fitted onto the mud pipe 6. The upper end of the mud pipe 6 is connected to the gooseneck tube 18 of the water tap via an upper sealing assembly. The lower end face of the outer circle of the packing box 13 is connected to the center tube of the water tap via a lower sealing assembly. The upper end of the packing box 13 is pressurized and sealed to the mud pipe 6 via a middle sealing assembly. It should be noted that all grooves and sealing rings involved in this application are O-ring grooves. Meanwhile, the mud pipe 6 passes through the inner holes of the intermediate pressure ring 7, packing 10, liner ring 11, gasket ring 12 and lower pressure ring 16. There is a radial gap between the outer circle of the mud pipe 6 and the inner holes of the intermediate pressure ring 7, liner ring 11, gasket ring 12 and lower pressure ring 16. There is an axial gap between the intermediate pressure ring 8, liner ring 11, gasket ring 12 and lower pressure ring 16. The outer circle of the mud pipe 6 is pressed and sealed by the inner hole of the packing 10 by the elastic deformation of the packing.

[0021] Specifically, as shown in the figure, the upper sealing assembly includes an upper nut 1 and an upper pressure ring 4. The upper nut 1 is threadedly connected to the gooseneck tube 18 via a trapezoidal thread. The upper end face and inner hole of the upper pressure ring 4 are respectively provided with a first groove and a second groove. The first sealing ring 2 and the second sealing ring 5 are respectively installed in the first groove and the second groove. The inner hole of the upper pressure ring 4 is also provided with an inner spline-shaped tooth. The upper end of the mud pipe 6 is provided with an outer spline-shaped tooth and a wire retainer groove. The outer spline-shaped tooth of the upper end of the mud pipe 6 is inserted into the inner spline-shaped tooth groove of the upper pressure ring 4, that is, the upper end of the mud pipe 6 is inserted into the interior of the upper pressure ring 4. The upper pressure ring 4 is pressed tightly against the end face of the gooseneck tube 18 by the upper nut 1. The wire retainer 3 is installed in the wire retainer groove of the mud pipe 6.

[0022] The lower sealing assembly is described in detail below. The lower sealing assembly includes a lower nut 15 and a lower pressure ring 16. The lower nut 15 is connected to the central tube of the faucet through a trapezoidal thread. The lower end face and the outer circular face of the lower pressure ring 16 are respectively provided with a third O-ring groove and a fourth O-ring groove. The third O-ring 14 is installed in the O-ring groove on the outer circular face of the lower pressure ring 16, i.e., the third groove. The fourth O-ring 17 is installed in the O-ring groove on the lower end face of the lower pressure ring 16, i.e., the fourth groove.

[0023] As shown in the figure, the lower end of the outer circle of the packing box 13 is provided with a stepped surface, and the lower end of the inner hole of the packing box 13 is also provided with a stepped surface. The lower nut 15 applies axial clamping force by screwing on the stepped surface of the outer circle of the packing box 13, and transmits it to the lower pressure ring 16 through the stepped surface of the inner hole, so that the lower end face of the lower pressure ring is pressed against the end face of the faucet center tube 19.

[0024] The following is a detailed description of the intermediate sealing assembly, which includes an intermediate pressure ring 8 and a clamping nut 7. The intermediate pressure ring 8 is sleeved on the outer circle of the mud pipe 6. The outer circle of the intermediate pressure ring 8 is in contact with the inner circle of the packing box. The upper end of the outer circle of the packing box 13 is provided with an external thread. The clamping nut is provided with a matching internal thread and is screwed onto the packing box. The packing box 13 includes packing 10, gasket 12, and bushing 11. Several packing 10s are provided between the middle pressure ring 8 and the lower pressure ring 16. The bushing 11s are provided between adjacent packing 10s. The packing closest to the lower pressure ring 16 is provided with a gasket 12 between it and the lower pressure ring 16. Each bushing 11 has a fifth groove on its outer surface, and a fifth sealing ring is installed in each of the fifth grooves. The outer surface of the gasket 12 also has a sixth groove, and a sixth sealing ring is installed in the sixth groove. The clamping nut 7 clamps the middle pressure ring 8, packing 10, and bushing 11 in sequence by the thread engagement force with the packing box 13 until the clamping force is applied to the inner step of the packing box.

[0025] It should be noted that during use, the upper nut 1 is screwed onto the gooseneck tube 18, pressing the upper pressure ring 4. The end face of the upper pressure ring 4 and the end face of the gooseneck tube 18 are sealed by an O-ring. The inner hole of the upper pressure ring 4 and the outer circle of the mud pipe 5 are also sealed by an O-ring. The inner spline-shaped groove of the inner hole of the upper pressure ring 4 matches the outer spline-shaped tooth on the outer circle of the mud pipe 6. When the upper nut 1 presses the upper pressure ring 4 onto the end face of the gooseneck tube 18, the upper pressure ring 4 cannot rotate, and the mud pipe 6 cannot rotate either. Therefore, the upper structure is statically sealed. Here, the O-ring seal replaces the traditional packing seal, and the tightening force required when assembling the upper nut 1 is relatively low. Normal torque is sufficient for screwing.

[0026] In use, the lower nut 15 is screwed onto the central tube, and the lower pressure ring 16 is pressed by the packing box 13. The end face of the lower pressure ring 16 is sealed with the end face of the faucet central tube by an O-ring, and the outer circle of the lower pressure ring 16 is sealed with the inner hole of the packing box 13 by an O-ring. When the lower nut 15 presses the lower pressure ring 16 onto the end face of the central tube by the packing box 13, the lower nut 15, the packing box 13, the lower pressure ring 16, the clamping nut 7, and the intermediate pressure ring 8, packing 10, bushing 11, washer 12, etc. installed inside the packing box rotate together with the faucet central tube. The mud pipe 6 is fixed, and the inner lip of the packing 10 rotates relative to the mud pipe 6. This is a dynamic seal.

[0027] When the high-pressure mud flows from the gooseneck pipe through the mud pipe 6 and enters the inner hole of the central pipe, a high-pressure sealed cavity is formed, and the high-pressure mud enters the following parts:

[0028] 1) At the A contact surface between the end face of the faucet center tube and the lower end face of the pressure ring 16, the mud is blocked by the fourth O-ring 17, so no leakage will occur here;

[0029] 2) The slurry enters the axial gap C between the gasket 12 and the lower pressure ring 16 through the annular gap B between the outer circle of the slurry pipe 6 and the inner hole of the lower sealing ring 16. The O-ring seal installed on the outer circle of the gasket 12 forms a seal with the inner hole of the packing box 13. The hydraulic pressure of the high-pressure slurry in the axial gap C acts simultaneously on the end faces of the lower pressure ring 16 and the gasket 12, and the resulting axial force further presses the lower pressure ring 16 against the end face of the central pipe; at the same time, it also compresses the gasket 12 towards the packing, further squeezing the packing 10. Therefore, the greater the hydraulic pressure of the slurry, the greater the clamping force and the better the sealing effect. If the working pressure of the slurry is not high, a large clamping force is not required. In this way, the packing does not have to be under constant working pressure compression, and its service life will be extended.

[0030] 3) After the slurry enters the cavity D through the annular gap B between the outer circle of the slurry pipe 6 and the inner hole of the lower sealing ring 16 and the gasket 12, the hydraulic pressure of the slurry deforms the inner lip of the packing 10, causing the inner lip to fit against the outer circle of the slurry pipe 6. Similarly, the greater the hydraulic pressure of the slurry, the greater the clamping force and the better the sealing effect. If the working pressure of the slurry is not high, a large clamping force is not required. In this way, the packing does not need to be under constant working pressure compression, and its service life will be extended.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A packing seal structure for a water tap in oil drilling, characterized in that, Includes a mud pipe (6), on which a packing box (13) is fitted. The upper end of the mud pipe (6) is connected to the gooseneck pipe of the faucet through an upper sealing component. The lower end face of the outer circle of the packing box (13) is connected to the center pipe of the faucet through a lower sealing component. The upper end of the packing box (13) is pressurized and sealed to the mud pipe (6) through a middle sealing component.

2. The packing seal structure for an oil drilling water tap according to claim 1, characterized in that: The upper sealing assembly includes an upper nut (1) and an upper pressure ring (4). The upper nut (1) is threaded to the gooseneck pipe. The upper end of the mud pipe (6) is inserted into the interior of the upper pressure ring (4). The upper pressure ring (4) is pressed tightly against the end face of the gooseneck pipe by the upper nut (1).

3. The packing seal structure for an oil drilling water tap according to claim 2, characterized in that: The upper end face and inner hole of the upper pressure ring (4) are respectively provided with a first groove and a second groove, and a first sealing ring (2) and a second sealing ring (5) are respectively installed in the first groove and the second groove.

4. The packing seal structure for an oil drilling water tap according to claim 2, characterized in that: The inner hole of the upper pressure ring (4) is also provided with an inner spline-shaped tooth, and the upper end of the mud pipe (6) is provided with an outer spline-shaped tooth and a wire retaining ring groove. The outer spline-shaped tooth of the upper end of the mud pipe (6) is inserted into the inner spline-shaped tooth groove of the upper pressure ring (4), and the wire retaining ring (3) is installed in the wire retaining ring groove of the mud pipe (6).

5. The packing seal structure for an oil drilling water tap according to claim 1, characterized in that: The lower sealing assembly includes a lower nut (15) and a lower pressure ring (16). The lower nut (15) is connected to the central tube of the faucet through a trapezoidal thread. The lower end face and the outer circular face of the lower pressure ring (16) are respectively provided with a third groove and a fourth groove. The third groove and the fourth groove are respectively equipped with a third sealing ring (14) and a fourth sealing ring (17).

6. The packing seal structure for an oil drilling water tap according to claim 5, characterized in that: The lower outer circle and the lower inner circle of the packing box (13) are both provided with stepped surfaces. The lower nut (15) applies axial clamping force by screwing onto the stepped surface of the outer circle of the packing box (13), and transmits it to the lower pressure ring (16) through the stepped surface of the inner hole, so that the lower end face of the lower pressure ring is pressed against the end face of the faucet center tube.

7. The packing seal structure for an oil drilling water tap according to claim 6, characterized in that: The intermediate sealing assembly includes an intermediate pressure ring (8) and a clamping nut (7). The intermediate pressure ring (8) is sleeved on the outer circle of the mud pipe (6). The outer circle of the intermediate pressure ring (8) is in contact with the inner circle of the packing box. The upper end of the outer circle of the packing box (13) is provided with an external thread. The clamping nut (7) is provided with an internal thread that mates with the external thread and is screwed onto the packing box (13).

8. The packing seal structure for an oil drilling water tap according to claim 7, characterized in that: The packing box (13) is provided with a gasket (12) and a liner (11). A plurality of packing rings (10) are provided between the intermediate pressure ring (8) and the lower pressure ring (16). The liner (11) is provided between adjacent packing rings. The packing ring closest to the lower pressure ring (16) is provided with a gasket (12) between it and the lower pressure ring (16). Each of the bushings (11) has a fifth groove on its outer surface, and a fifth sealing ring is installed in each of the fifth grooves. The outer surface of the gasket (12) also has a sixth groove, and a sixth sealing ring is installed in the sixth groove. The clamping nut (7) clamps the intermediate pressure ring (8), packing (10), and bushing (11) in sequence by the thread engagement force with the packing box (13) until the clamping force is applied to the inner step of the packing box.

9. The packing seal structure for an oil drilling water tap according to claim 8, characterized in that: There are radial gaps between the outer circle of the mud pipe (6) and the inner holes of the intermediate pressure ring (7), the liner ring (11), the gasket ring (12) and the lower pressure ring (16), and there are axial gaps between the intermediate pressure ring (8), the liner ring (11), the gasket ring (12) and the lower pressure ring (16).

Images