Rotary joint device for high-pressure pipeline

Abstract

The invention relates to a high-pressure pipeline rotating joint, in particular to a sealing stress rotating joint used for conveying high-pressure liquid or gas media. A sealing groove is formed in a hole in the upper portion of the shell, the sealing ring is arranged in the groove, internal threads are arranged on the lower portion of the shell and connected with threads on the upper portion of the lower shaft, the upper portion of the internal threads of the shell is a smooth cavity so that the upper portion of the lower shaft can be guided into the cavity, and the outer diameter of the threads on the lower portion of an inner cavity of the shell is larger than that of the smooth cavity on the upper portions of the threads. A protruding circular truncated cone is arranged outside the upper shaft, the upper surface of the circular truncated cone is in contact with the radial bearing, and the lower surface of the circular truncated cone is in contact with the inner ring of the bearing; the upper part of the lower shaft is a smooth cylinder which is matched with a smooth inner cavity at the lower part of the shell; the lower portion of the upper shaft is matched with a center hole in the upper portion of the lower shaft, and a sealing groove is formed in an inner hole of the lower shaft. According to the invention, high-speed rotation can be realized under the condition of high-pressure liquid or gas delivery, and axial force and radial force can be borne between the rotating end and the fixed end.

Description

Technical Field

[0001] The invention relates to a pipe joint, in particular to a joint for a high-pressure pipe, which is used for a fixed part to a rotating part, or a rotating part to a fixed part to transport high-pressure liquid or high-pressure gas, and is a rotary seal that withstands radial and axial forces. Background Art

[0002] Traditional high-pressure rotary sealing joints have a complex structure, a narrow range of liquid or gas pressures, small axial and radial forces, a short service life, and complex maintenance. Summary of the invention

[0003] The purpose of the present invention is to improve and innovate the shortcomings and problems existing in the background technology, and to provide a reliable, safe and applicable joint that is convenient for transporting high-pressure liquids or gases and other media in pipelines and completes pipeline rotation sealing and force-bearing work.

[0004] The technical solution of the present invention is to construct a high-pressure pipeline rotary sealing force-bearing joint:

[0005] The upper end hole of the housing (102) is matched with the upper shaft (101), the thread of the lower end hole of the housing (102) is threadedly connected with the lower shaft (103), the lower part of the upper shaft (101) is matched with the upper cavity of the lower shaft (103), a sealing ring is provided in the sealing groove for sealing, and the upper shaft (101) rotates in the holes of the housing (102) and the lower shaft (103).

[0006] The upper shaft (101) rotates relative to the housing (102) and the lower shaft (103), and the upper and lower surfaces of the protruding cylinder outside the upper shaft (101) rotate in contact with the bearings (61), (62) and (63).

[0007] The present invention has the following advantages and effects:

[0008] The present invention can withstand high pressure of liquid or gas fluid, and can rotate fast or slow, and can rotate forward or reverse. It can withstand large axial force and radial force load during rotation. It has a simple, safe and reliable structure, and convenient seal inspection and maintenance. It is convenient for high-pressure fluid transportation and is used in situations where pipeline rotation is required and rotating parts need to withstand radial and axial forces. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the structure of the present invention. Implementation

[0010] Depend on Figure 1 It can be seen that the present invention includes:

[0011] The lower part of the housing (102) has an internal thread connected to the thread of the upper part of the lower shaft (103); the upper part of the internal thread of the housing (102) is a smooth cavity, which is precisely axially matched and positioned with the upper cavity of the lower shaft (103).

[0012] The outer diameter of the thread at the lower part of the inner cavity of the shell (102) is greater than the outer diameter of the smooth cavity at the upper part of the thread. When the lower shaft (103) and the outer shell (102) threads are matched, the smooth cylindrical part at the upper part of the lower shaft (103) and the smooth part of the inner cavity of the shell (102) are automatically and accurately matched axially.

[0013] The upper shaft (101) has a truncated cone on the outside, and the upper surface of the truncated cone contacts the radial bearing, so that the upper shaft (101) can withstand a large radial tensile force and work reliably.

[0014] The upper shaft (101) has a truncated cone on the outside, the bottom of which contacts the inner ring of the bearing, and there are one or more bearings under the truncated cone, so that the upper shaft (101) can withstand a large extrusion force and a radial force to perform reliable rotational sealing.

[0015] The lower part of the upper shaft (101) matches the hole in the center of the upper part of the lower shaft (103). The upper part of the lower shaft (103) is a smooth cylinder, which matches the smooth inner cavity of the lower part of the shell (102) to play a precise radial positioning role during threaded assembly.

[0016] The inner hole of the lower shaft (103) is provided with one or more sealing grooves, and a sealing ring is provided in the sealing groove to seal against the high-pressure fluid.

[0017] The invention can rotate at high speed under the condition of high-pressure liquid or gas delivery and bear axial force and radial force between the rotating end and the fixed end to work reliably.

[0018] The rotation between the upper shaft (101) of the rotating member and the housing (102) and the lower shaft (103) of the rotating member is supported by bearings (61), (62), (63) and the positions between the rotating members are accurately positioned. The rotational friction is small and highly reliable. The sealing member (32) has one or more than one sealing member, and the sealing member is not affected by radial forces, so that the sealing member is reliable and durable.

[0019] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0020] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high-pressure pipeline rotary joint device, characterized by: A housing (102), an upper shaft (101), a lower shaft (103), a bearing (61), (62), (63), and a sealing ring (20), (32); the upper end hole of the housing (102) matches with the upper shaft (101), the threaded hole of the lower end hole of the housing (102) is threadedly connected with the lower shaft (103), the lower part of the upper shaft (101) matches with the upper cavity of the lower shaft (103), the sealing ring in the sealing groove (32) is sealed, and the upper shaft (101) rotates in the middle holes of the housing (102) and the lower shaft (103).

2. A high pressure pipeline rotary joint device according to claim 1, characterized in that The housing (102) shown in FIG2 has a circular hole in the center of the upper portion, a sealing groove is provided on the inner wall of the circular hole, and a sealing ring is placed in the sealing groove; the circular hole having no sealing groove on the inner wall is also within the scope of the claims.

3. A high pressure pipeline rotary joint device according to claim 1, characterized in that The housing (102) shown in FIG2 has a circular hole in the center of the upper portion, a sealing groove is provided on the inner wall of the circular hole, and a sealing ring is placed in the sealing groove; the circular hole having no sealing groove on the inner wall is also within the scope of the claims.

4. A high pressure pipeline rotary joint device according to claim 1, characterized in that The upper shaft (101) shown in FIG3 has a cylindrical platform on the outside of the shaft, and a small cylindrical platform under the cylindrical platform. The small cylindrical platform may be omitted and replaced by a gasket of the same specification.

5. A high pressure pipeline rotary joint device according to claim 1, characterized in that The upper shaft (101) shown in FIG3 has a hollow through hole in the center of the shaft, and the upper part of the shaft has connecting threads connected to other parts. The upper part of the shaft can be connected by a connection method other than threads within the scope of the claimed invention.

6. A high pressure pipeline rotary joint device according to claim 1, characterized in that The lower shaft (103) shown in FIG4 has an upper outer shaft of a smooth surface, the diameter of the smooth surface portion is smaller than the diameter of the adjacent lower threaded portion, the middle of the lower shaft (103) is a through hole, the through hole has a sealing groove, the number of the sealing grooves is one or more, and a sealing ring is provided in the sealing groove.

7. A high pressure pipeline rotary joint device according to claim 1, characterized in that The lower shaft (103) shown in FIG4 has a connecting thread at the bottom to connect with the external component. The lower part of the lower shaft (103) may be connected by a connection method other than a thread within the scope of the claimed invention.

8. A high pressure pipeline rotary joint device according to claim 1, characterized in that In the above-mentioned Figure 1, the lower part of the housing (102) has an internal thread connected with the thread of the upper part of the lower shaft (103); the upper part of the internal thread of the housing (102) is a smooth cavity so that the upper part of the lower shaft (103) cooperates with the cavity for precise axial positioning; the outer diameter of the thread at the lower part of the inner cavity of the housing (102) is larger than the outer diameter of the smooth cavity at the upper part of the thread; the outer part of the upper shaft (101) has a protruding cone, the upper part of the cone contacts the radial bearing, the lower part of the cone contacts the inner ring of the bearing, and there are one or more bearings at the lower part of the cone; the upper part of the lower shaft (103) is a smooth cylinder that matches the smooth inner cavity of the lower part of the housing (102); the lower part of the upper shaft (101) matches the hole at the center of the upper part of the lower shaft (103); the inner hole of the lower shaft (103) has a sealing groove, and a sealing ring is arranged in the sealing groove; the present invention can rotate at high speed under the condition of high-pressure liquid or gas transportation and withstand axial force and radial force between the rotating end and the fixed end.

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