CN114215979A

CN114215979A - Pipeline connection pressing device

Info

Publication number: CN114215979A
Application number: CN202111435409.2A
Authority: CN
Inventors: 高松; 徐鑫; 胡云彪; 张凯琳; 高万彬
Original assignee: AECC Shenyang Engine Research Institute
Current assignee: AECC Shenyang Engine Research Institute
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-03-22

Abstract

The application provides a tube coupling closing device, tube coupling closing device includes: an inner taper fitting having an inner tapered surface; the ball head is provided with a spherical surface, and at least part of the spherical surface of the ball head is inserted into the inner conical pipe joint and forms a line contact sealing surface with the conical surface; the outer sleeve nut is used for connecting the inner taper pipe joint and the ball head; the pressing adjusting ring is provided with an inner spherical surface matched with the spherical surface, is sleeved on one side of the ball head away from the inner conical pipe joint and is matched with the outer sleeve nut; by adjusting the relative position of the outer sleeve nut and the inner taper pipe joint, an acting force ball head can be applied through the compression adjusting ring, and therefore the ball head and the inner taper pipe joint are fixed relatively. The method and the device can greatly reduce the calibration work in the assembling process of the external pipeline, reduce the machining precision and the installation precision requirements of the connecting part, improve the reliability of the pipeline connection of the gas turbine and reduce the oil leakage fault of the pipeline.

Description

Pipeline connection pressing device

Technical Field

The application belongs to the technical field of pipeline connection, and particularly relates to a pipeline connection pressing device.

Background

The guide pipe in the pipeline system of the gas turbine connects the parts of the gas turbine, the accessories and the parts and the accessories with each other and conveys the specified fluid respectively to complete the functions of the gas turbine such as operation, control, operation and the like. The pipeline system comprises the conduit assemblies, the connecting pieces thereof and the like. The piping system has a significant impact on the performance and reliability of the gas turbine. By incomplete statistics, 50% of gas turbine failures are due to external piping, wiring, sensor damage and failure.

At present, most of gas turbine pipeline connection structures are spherical pipeline connections, as shown in fig. 1, the structure includes an inner taper pipe joint 11, a ball head 12 and an outer nut 13, a sealing surface 14 between the inner taper pipe joint 11 and the ball head 12 is line sealing, and a pressing surface 15 between the ball head 12 and the outer nut 13 is end surface sealing.

As shown in fig. 2 and 3, in order to ensure the sealing performance of the pipeline connection, the ball head 12 and the inner taper pipe joint 11 need to be uniformly pressed in the circumferential direction, so that the processing precision requirements of the surface a of the ball head 12 and the surface B of the outer sleeve nut 13 are high.

Because the length of the pipeline of the gas turbine is usually long, the centering of the two pipelines cannot be ensured, and therefore, a large amount of shape correction work is often required to ensure the concentricity of the pipelines in the assembling process. As shown in fig. 4, in the pipeline assembled in the non-concentric state, the axial pressing force of the dislocated pressing surface cannot ensure reliable sealing of the sealing surface, and the pipeline is very easy to leak oil during the whole machine test.

Disclosure of Invention

It is an object of the present application to provide a pipe connection compression device to solve or mitigate at least one of the problems of the background art.

The technical scheme of the application is as follows: a plumbing fixture, comprising:

an inner taper fitting having an inner tapered surface;

the ball head is provided with a spherical surface, and at least part of the spherical surface of the ball head is inserted into the inner conical pipe joint and forms a line contact sealing surface with the conical surface;

the outer sleeve nut is used for connecting the inner taper pipe joint and the ball head;

the pressing adjusting ring is provided with an inner spherical surface matched with the spherical surface, is sleeved on one side of the ball head away from the inner conical pipe joint and is matched with the outer sleeve nut;

by adjusting the relative position of the outer sleeve nut and the inner taper pipe joint, an acting force ball head can be applied through the compression adjusting ring, and therefore the ball head and the inner taper pipe joint are fixed relatively.

Furthermore, the inner taper pipe joint is connected with the outer sleeve nut through a threaded structure.

Further, the outer sleeve nut is provided with a radially extending limiting portion, and the pressing adjusting ring is limited by the limiting portion.

Furthermore, the inner end surface of the limiting part is arranged between the outer surface of the pipe diameter of the ball head and the outer diameter surface of the pressing adjusting ring.

Furthermore, the spherical surface of the ball head at least comprises an arc-shaped surface which partially exceeds the spherical vertex and extends outwards.

Furthermore, the inner spherical surface of the pressing adjusting ring is matched with the arc-shaped surface on the outer side of the top point of the ball.

Further, the compression adjusting ring is made of a sealing material.

Further, the sealing material comprises a metal material and a non-metal material.

Compared with the existing spherical connection structure, the pipeline connection pressing device can adjust the non-concentric accumulated tolerance of the connection pipeline generated in the manufacturing process in a self-adaptive manner by pressing the adjusting ring, thereby greatly reducing the calibration work in the external pipeline assembly process, reducing the machining precision and installation precision requirements of the connection part, improving the reliability of pipeline connection of the gas turbine and reducing the pipeline oil leakage fault.

Drawings

In order to more clearly illustrate the technical solutions provided by the present application, the following briefly introduces the accompanying drawings. It is to be expressly understood that the drawings described below are only illustrative of some embodiments of the invention.

Fig. 1 is a schematic diagram of a spherical pipeline connection structure in the prior art.

Fig. 2 is a schematic diagram of a position of an a-surface of a ball head in the prior art.

Fig. 3 is a schematic position diagram of a B-side of a prior art outer sleeve nut.

Fig. 4 is a schematic view of a spherical pipeline connection structure in a state of non-concentricity of pipelines in the prior art.

Fig. 5 is a schematic view of a ball pipe connection compression structure according to the present application.

Fig. 6 is a partially enlarged view of the ball pipe connection compression structure of fig. 5.

Fig. 7 is a schematic view of a ball pipeline connection compression structure in a pipeline concentric state in the application.

Fig. 8 is a schematic view of a ball pipeline connection compression structure in the application when the pipelines are not concentric.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.

In order to solve the problem that the concentricity between pipelines is difficult to ensure due to the fact that manufacturing tolerances are accumulated in an assembly link when the manufacturing consistency of the pipelines is poor, the application provides the pipeline connecting and pressing device, the device can still ensure effective pressing force and the tightness of the pipelines when the concentricity of the pipelines is poor, meanwhile, the requirements of machining precision and pipeline assembly precision of a pipeline connecting piece can be reduced, the calibration workload in the pipeline assembly process is reduced, the reliability of pipeline connection is effectively improved, and the oil leakage fault of the pipelines is greatly reduced.

As shown in fig. 5 and 6, the pipe connecting and compressing structure mainly comprises four parts, namely an inner cone joint 21, a ball head 22, an outer sleeve nut 23 and a compressing and adjusting ring 24.

Wherein the inner tapered pipe joint 21 has an inner tapered surface 211, the ball head 22 has an outer spherical surface 221, and the spherical surface 221 of the ball head 22 is partially inserted into the inner tapered surface 211 of the inner tapered pipe joint 21, so that the inner tapered surface 211 of the inner tapered pipe joint 21 and the spherical surface of the ball head 22 form a line contact sealing surface. The pressing adjusting ring 24 has an inner spherical surface 241 fitting the spherical surface of the ball head, which is sleeved on the pipeline side of the ball head 22, and the pressing adjusting ring 24 can be fastened on the ball head 22 by connecting the inner conical pipe joint 21 to the outer nut 23.

Wherein the outer nut 23 is threadedly coupled with the inner tapered pipe joint 21 to achieve adjustment of a tightening force. The right side of the outer nut 23 is provided with a radially extending limiting part 231, the left end surface of the limiting part 231 and the side end surface 242 of the pressing adjusting ring 24 form an end surface pressing surface, and the inner conical pipe joint 21, the ball head 22 and the pressing adjusting ring 24 can be pressed through a spherical contact pressing surface formed by the spherical surface 231 of the ball head 22 and the inner spherical surface 241 of the pressing adjusting ring 24 and a threaded connection mode of the outer nut 23 and the inner conical pipe joint 21.

Further, in this application, the inner diameter end face of the limiting portion 231 is between the outer diameter surface of the pipe diameter of the ball head 22 and the outer diameter surface of the pressing adjusting ring 23, so that the length of the limiting portion 231 meets the requirement, and the pressing adjusting ring 24 is limited.

In addition, in the present application, the spherical surface 221 of the ball head 22 has an arc surface that extends to the outer pipeline portion beyond the highest point a, where the highest point a of the spherical surface 221 is a point on the spherical surface where the length of the perpendicular line perpendicular to the axis of the ball head 22 is the largest. As shown in fig. 6, the inner spherical surface 241 of the compression adjustment ring 24 is adapted to the arc-shaped surface of the bulb 22 outside the highest point a, so that the compression adjustment ring 24 can apply a locking force to the bulb 22 when the outer nut 23 is locked with the inner taper pipe joint 21.

In addition, the compression adjustment ring 24 of the present application is made of a sealing material, which may be a metallic material or a non-metallic material. For example, the compression adjustment ring 24 may be made of a GCI (Gray cast iron) metal material, or may be made of various rubber materials or non-metal materials such as graphite.

As shown in fig. 7, when the pipeline is assembled, and the concentricity of the pipeline is good, the outer nut 23 and the inner taper pipe joint 21 are connected by screw threads to compress the inner taper pipe joint 21, the ball head 22 and the compression adjusting ring 24, and the inner conical surface of the inner taper pipe joint 21 and the spherical surface of the ball head 22 are sealing surfaces to ensure the sealing performance of the pipeline.

As shown in fig. 8, when the pipelines are assembled, and the manufacturing tolerance is accumulated in the assembly link due to the poor manufacturing consistency of the pipelines, and it is difficult to ensure the concentricity between the pipelines, the spherical surface 221 of the ball 22 can rotate in the pressure adjusting ring 24, and the outer nut 23 can still be connected with the inner taper pipe joint 21 through the screw thread to press the inner taper pipe joint 21, the ball 22 and the pressure adjusting ring 24. The pressing force generated by the threaded connection can be uniformly applied to the spherical surface 221 of the ball head 22 by pressing the side end surface 242 and the inner spherical surface 241 of the adjusting ring 24, so as to ensure the tightness of the pipeline.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a tube coupling closing device which characterized in that, tube coupling closing device includes:

an inner taper pipe joint (21) having an inner taper surface (211);

a ball head (22) having a spherical surface (221), the spherical surface (221) of the ball head (22) being at least partially inserted into the inner conical pipe joint (21) and forming a line contact sealing surface with the conical surface (211);

an outer nut (23) for connecting the inner taper pipe joint (21) and the ball head (22);

the pressing adjusting ring (24) is provided with an inner spherical surface (241) matched with the spherical surface (221), and the pressing adjusting ring (24) is sleeved on one side, far away from the inner conical pipe joint (21), of the ball head (22) and matched with the outer sleeve nut (23);

by adjusting the relative position of the outer sleeve nut (23) and the inner taper pipe joint (21), an acting force ball head (22) can be applied by pressing the adjusting ring (24), so that the ball head (22) and the inner taper pipe joint (21) are relatively fixed.

2. The line connecting and compressing device as claimed in claim 1, wherein the female coupler (21) and the male nut (23) are connected by a screw structure.

3. Line connection pressing device according to claim 1 or 2, characterised in that the outer nut (23) has a radially extending limiting portion (231), by means of which limiting portion (231) the pressing adjusting ring (24) is limited.

4. The pipe connection pressing device according to claim 3, wherein an inner end surface of the limiting portion (231) is interposed between an outer diameter surface of the ball head (22) and an outer diameter surface of the pressing adjusting ring (24).

5. A pipe connection pressing device according to claim 1, wherein the spherical surface (221) of the ball head (22) comprises at least an arc surface partially extending beyond the spherical vertex to the outside.

6. The pipe connection compressing apparatus as claimed in claim 5, wherein the inner spherical surface (241) of the compressing adjusting ring (24) is fitted to the arc surface outside the vertex of the spherical shape.

7. The line connection compression device of claim 1, wherein the compression adjustment ring (24) is made of a sealing material.

8. The plumbing fixture of claim 6, wherein the sealing material comprises a metallic material and a non-metallic material.