阅读说明：本技术 一种用于复合材料管试压实验的扣压接头 (Buckling and pressing joint for composite material pipe pressure test experiment ) 是由 娄敏 王阳阳 王宇 王森 代文涛 于 2021-06-11 设计创作，主要内容包括：本发明提供一种用于复合材料管试压实验的扣压接头,包括：扣压接头、连接部以及控制机构；所述扣压接头分别安装在复合材料实验样管的两端,用于通过扣压机对复合材料管的端部进行密封；所述连接部用于将所述扣压接头与加压装置进行连接；所述控制机构安装在连接部上,用于控制加压装置对复合材料管的加载速度和充压值。本发明装置相连,固定效果好,不易发生试样滑动和脱落。(The invention provides a withholding joint for a composite material pipe pressure test experiment, which comprises: the buckling connector, the connecting part and the control mechanism; the buckling and pressing joints are respectively arranged at two ends of the composite material experiment sample pipe and are used for sealing the end part of the composite material pipe through a buckling and pressing machine; the connecting part is used for connecting the buckling and pressing joint with a pressurizing device; the control mechanism is arranged on the connecting part and used for controlling the loading speed and the pressurizing value of the pressurizing device to the composite material pipe. The device of the invention is connected, has good fixing effect and is not easy to slide and fall off the sample.)

1. The utility model provides a withhold and connect for combined material pipe pressure testing experiment which characterized in that includes: the buckling connector, the connecting part and the control mechanism;

the buckling and pressing joints are respectively arranged at two ends of the composite material experiment sample pipe (5) and used for sealing the end part of the composite material pipe through a buckling and pressing machine;

the connecting part is used for connecting the buckling and pressing joint with a pressurizing device;

the control mechanism is arranged on the connecting part and used for controlling the loading speed and the pressurizing value of the pressurizing device to the composite material pipe.

2. The withholding joint for composite material pipe pressure testing experiments of claim 1, comprising: the joint comprises a buckling joint inner core (1) and a buckling joint outer sleeve (2);

the crimping connector inner core (1) comprises: the inner part of the pipe is arranged inside the composite material experiment sample pipe (5), and the outer part (11) of the pipe is arranged outside the composite material experiment sample pipe (5) and is fixedly connected with a crimping machine;

a pressurizing channel (9) is arranged in the buckling and pressing joint, one end of the pressurizing channel (9) is communicated with the inside of the composite material experiment sample tube (5), and the other end is communicated with a pressurizing device.

3. The withholding joint for pressure testing experiments on composite material pipes according to claim 2, characterized in that on the inner part of the pipe there are provided barbs (13).

4. The withholding joint for the composite material pipe pressure test experiment as claimed in claim 2, wherein a protrusion (12) is arranged between the inner part and the outer part (11) of the composite material pipe, and the pressurizing channel (9) is communicated with the pressurizing device after penetrating through the protrusion (12).

5. The withholding joint for pressure testing experiments on composite material pipes as claimed in claim 2, wherein the length L of the inner pipe part is longer than the length of the withholding joint outer jacket (2).

6. The crimping connector for testing of composite material pipes according to claim 4, wherein the connecting portion comprises: a right-angle joint (6) and a high-pressure oil pipe (7);

one end of the high-pressure oil pipe (7) is communicated with the right-angle joint (6), and the other end of the high-pressure oil pipe is communicated with the pressurizing device;

the right-angle joint (6) is communicated with the pressurizing channel (9) through a bulge (12).

7. The withholding joint for testing composite material pipes according to claim 6, wherein the control mechanism comprises: the high-pressure ball valve (4), the first adapter (3) and the second adapter (8);

the high-pressure ball valve (4) is installed on the high-pressure oil pipe (7), one end of the high-pressure ball valve (4) is communicated with the high-pressure oil pipe (7) through the second adapter (8), and the other end of the high-pressure ball valve is communicated with the pressurizing device through the first adapter (3).

Technical Field

The invention belongs to the technical field of material mechanics test equipment, and particularly relates to a withholding joint for a composite material pipe pressure test experiment.

Background

The composite material pipeline has unique advantages of higher rigidity-weight ratio, stronger fatigue resistance, better corrosion resistance and the like, and is more and more accepted as an important substitute of the traditional offshore metal pipeline. In the last few years composite pipelines have been used in the offshore field, mainly as water injection pipelines and crude oil transportation pipelines. With the research on composite pressure vessels becoming more and more intensive, deep water risers/risers are developing into their future application trends. With the increasing application water depth and the need of long-distance oil transportation, the bearing capacity becomes an important index for the design of composite material pipelines. Underestimating the pressure capacity of a pipeline can lead to failure of the pipeline during operation with catastrophic consequences in environmental, economic and geopolitical terms. On the other hand, since offshore pipelines are usually very long, a slight overestimation of their pressure-bearing capacity will lead to considerable additional manufacturing and transportation costs. A pressure test experiment of the composite material is an important means for evaluating the pressure bearing capacity of the composite material.

In a pressure test experiment of the composite material pipeline, a fixing device is usually adopted to fix the pipeline, a bursting test machine is utilized to measure the pressure bearing capacity of the pipeline in a constant-speed water/gas filling mode, and the pressure bearing capacity of the pipeline is observed and recorded simultaneously. As the main material of the composite material pipeline is polymer, the damage of the end part of the pipeline is easily caused in the buckling and pressing installation process of the sample pipe joint, and the experiment failure is further caused. And on the premise of ensuring the pipeline sealing, the pressurizing interface becomes a vulnerable part of the pipeline. For a long-distance oil and gas conveying pipeline, higher pressure bearing capacity is needed, so the design of the buckling and pressing joint of the experimental sample pipe is more prominent in the significance of experimental success and failure.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides the withholding joint which can adapt to the pressure test experiment of the composite material pipeline.

A withhold and connect for combined material pipe pressure testing experiment includes: the buckling connector, the connecting part and the control mechanism;

the buckling and pressing joints are respectively arranged at two ends of the composite material experiment sample pipe and are used for sealing the end part of the composite material pipe through a buckling and pressing machine;

the connecting part is used for connecting the buckling and pressing joint with a pressurizing device;

the control mechanism is arranged on the connecting part and used for controlling the loading speed and the pressurizing value of the pressurizing device to the composite material pipe.

Further, as above a withhold joint for combined material pipe pressure testing experiment, withhold the joint and include: the buckling and pressing joint inner core and the buckling and pressing joint outer sleeve;

the crimping connector inner core includes: the device comprises an inner part and an outer part, wherein the inner part is arranged inside a composite material experiment sample tube, and the outer part is arranged outside the composite material experiment sample tube and is fixedly connected with a crimping machine;

and a pressurizing channel is arranged in the buckling and pressing joint, one end of the pressurizing channel is communicated with the inside of the composite material experiment sample pipe, and the other end of the pressurizing channel is communicated with a pressurizing device.

Further, the withholding joint for the composite material pipe pressure test experiment is provided with the inverted teeth on the inner part of the pipe.

Furthermore, according to the withholding joint for the composite material pipe pressure test experiment, a bulge is arranged between the inner part and the outer part of the pipe, and the pressurizing channel penetrates through the bulge and then is communicated with the pressurizing device.

Further, as for the withholding joint for the composite material pipe pressure test experiment, the length L of the inner part of the pipe is longer than the length of the outer sleeve of the withholding joint.

Further, a withhold joint for combined material pipe pressure testing experiment as above, connecting portion include: right-angle joints, and high-pressure tubing;

one end of the high-pressure oil pipe is communicated with the right-angle joint, and the other end of the high-pressure oil pipe is communicated with the pressurizing device;

the right-angle joint is communicated with the pressurizing channel through a bulge.

Further, a withholding joint for pressure testing experiment of composite material pipe as described above, the control mechanism includes: the high-pressure ball valve, the first adapter and the second adapter are arranged on the high-pressure ball valve;

the high-pressure ball valve is installed on the high-pressure oil pipe, one end of the high-pressure ball valve is communicated with the high-pressure oil pipe through the second adapter, and the other end of the high-pressure ball valve is communicated with the pressurizing device through the first adapter.

The invention has the advantages that: 1. the buckling and pressing joint formed by the metal inner core and the joint outer sleeve is connected with the fixing device, the fixing effect is good, and the sliding and falling of the sample are not easy to occur. 2. The inner core all is good at the joint overcoat at the inside and outside length of appearance pipe, suitably thickens in appearance pipe fracture department, can avoid damaging the pipeline at withholding in-process, can guarantee the leakproofness of appearance pipe simultaneously, also provides the position for the erection joint portion. 3. The high-pressure ball valve is adopted to control the loading speed and the loading pressure, the success rate of a pressure test experiment can be improved, and the sample tube can be supported to carry out combined load experiments such as under-pressure stretching, under-pressure bending and the like, so that the application range of the withholding joint is widened. 4. The components of the device are connected by threads, and the device is simple and convenient to use. 5. The inner core, the connecting part and the high-pressure ball valve adopted by the transposition in the experimental process can be recycled, so that the experimental cost can be effectively reduced.

Drawings

FIG. 1 is an overall structural view of the apparatus of the present invention;

FIG. 2 is a cross-sectional view of the apparatus of the present invention;

FIG. 3 is a detail view of the crimp fitting core;

reference numerals:

1-buckling and pressing an inner core of the joint; 2-buckling and pressing the joint outer sleeve; 3-a first crossover sub; 4-high pressure ball valve; 5-composite material experiment sample tube; 6-right-angle joint; 7-high pressure oil pipe; 8-a second crossover joint, 11-the outer tube portion; 12-a bump; 13-pawl; 9-pressurizing the channel.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described below clearly and completely, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention relates to a buckling and pressing joint designed aiming at a composite material pipeline pressure test experiment, which not only meets the fixing and pressing requirements of the experiment, but also better protects the end part of the pipeline from being damaged and ensures the smooth development of the pipeline pressure test experiment.

Specifically, the joint is mainly divided into three parts: the first part is: and the buckling joints are respectively arranged at two ends of the composite material experiment sample pipe 5 and are used for sealing the end part of the composite material pipe through a buckling press. This withhold and connect includes: a buckling and pressing joint inner core 1 and a buckling and pressing joint outer sleeve 2. The crimping connector inner core 1 comprises: the device comprises an inner part and an outer part 11, wherein the inner part is arranged inside a composite material experiment sample pipe 5, and the outer part 11 is arranged outside the composite material experiment sample pipe 5 and is fixedly connected with a crimping machine;

a pressurizing channel 9 is arranged in the buckling joint, one end of the pressurizing channel 9 is communicated with the inside of the composite material experiment sample tube 5, and the other end is communicated with a pressurizing device.

One end of the buckling and pressing joint inner core 1 is provided with inverted teeth 13, and the pipe outer part 11 is arranged at two ends of the pipeline and is used for being fixed on a testing machine; a bulge 12 is arranged between the inverted tooth 13 and the pipe outer part 11, and the bulge 12 is used for further sealing the pipeline port when the pressurizing device is installed; the length L of the buckling and pressing joint inner core 1 in the pipe needs to be longer than that of the buckling and pressing joint outer sleeve 2 so as to avoid damaging the end of the pipe in the buckling and pressing process (in the actual buckling and pressing process, if the length L of the buckling and pressing joint inner core 1 in the pipe is shorter than or equal to that of the buckling and pressing joint outer sleeve 2, the joint of the experimental pipe section and the joint can be damaged in the buckling and pressing process, a concentrated force can be generated on the enhancement layer in the buckling and pressing process, the capability of the fiber and the base material for bearing vertical pressure is not strong enough, so that the joint can be damaged in the buckling and pressing process, and the experimental damage position can be generated at the joint.

The second part is as follows: connecting portion for will install at the combined material test tube both ends withhold and connect with pressure device, this connecting portion mainly comprise right angle joint 6 and high pressure fuel pipe 7. One end of the high-pressure oil pipe 7 is communicated with the right-angle joint 6, and the other end of the high-pressure oil pipe is communicated with the pressurizing device;

the right-angle joint 6 is communicated with the pressurizing channel 9 through a bulge 12.

The third part is that: and the control mechanism is arranged on the connecting part and is used for controlling the pressurizing speed and controlling the pressure inside the pipeline. The control structure includes: the high-pressure ball valve 4, the first adapter 3 and the second adapter 8; the high-pressure ball valve 4 can support an experiment sample tube to perform a pressure test experiment and also support the sample tube to perform a combined load experiment such as stretching and bending under pressure. The device of the invention seals the composite material pipeline sample through the buckling and pressing joint, reserves the pressurizing channel 9 in the inner core of the buckling and pressing joint, and connects the sample tube with the pressurizing device through the connecting part, thereby realizing the purpose of connecting the experimental sample tube with the loading experiment machine for pressurizing. And finally, the high-pressure ball valve is adopted to control the pressurizing process and the loading pressure, so that the pressure test experiment of the composite material pipeline can be better developed, and the combined load experiment of the experiment sample pipe such as stretching under pressure, bending under pressure and the like can be supported. The high-pressure ball valve is used for controlling the loading speed and the loading pressure, so that the success rate of a pressure test experiment can be improved (before a pipeline part such as a tensile experiment with internal pressure and a torsion experiment with internal pressure, the pipeline part needs to be pressurized firstly, the pressure is ensured not to be leaked in the experiment process, the loading speed and the tightness of a joint are key guarantees of the success of the experiment, the high-pressure ball valve can effectively control the loading speed, the pressure is ensured not to be leaked in the experiment process, and the success rate of the experiment is improved further).

The invention is suitable for connection fixation and loading of a composite material pipe pressure test, and the specific sizes of the withholding joint, the connecting part and the high-pressure ball valve are adjusted according to the specific sizes of a test sample pipe and a loading device. The parts must be cleaned and cleaned before assembly without burrs, fins, scale, rust, oil stains, colorants, dust, and the like.

Fig. 1 is a schematic view showing the overall structure of the apparatus of the present invention, and fig. 2 is a cross-sectional view of the apparatus of the present invention. For convenience of size description, assume that the test specimen has an outer diameter of 53.6 units, an inner diameter of 41.7 units, and a length of 680 units, wherein the length of the test specimen is 500 units (inner and outer diameters refer to diameters).

The buckling and pressing joint inner core 1 is of a metal solid structure and is divided into an inner part and an outer part, the length of the inner core is 195 units, the length of the inner part is 90 units, the outer diameter is 44 units, the length of the outer part of the pipe is 105 units, and the outer diameter is 60 units. The interior of the tube is respectively provided with inverted teeth 13, and the length L of the inner core in the tube is longer than that of the buckling joint outer sleeve 2; the outer tube part can be designed with a smooth or rough surface according to the type of the holding device. The position of the inner core at the end of the sample tube is designed with a protruding structure with the length of 20 units and the outer diameter of 75 units so as to install the right-angle connector 6 and design the pressurizing channel 9. The pressurizing channel 9 is formed by a bulge 12 which penetrates through the inner part of the inner core pipe of the buckling and pressing joint so as to realize the pressurizing from the outside to the inside of the pipe. An experiment appearance pipe needs two inner cores, assembles appearance pipe, inner core and overcoat, and rethread buckleing machine straining joint overcoat just can be with the straining of appearance pipe and inner core, and firm the connection is in the same place.

The connecting part consists of a right-angle joint 6 and a high-pressure oil pipe 7 and is used for connecting the buckling joint with a pressurizing device. One end of the high-pressure oil pipe 7 is communicated with the right-angle joint 6, and the other end of the high-pressure oil pipe is communicated with the pressurizing device;

the right-angle joint 6 is communicated with the pressurizing channel 9 through a bulge 12.

The high-pressure ball valve 4 is mounted on the connection part so as to control the loading speed and the charging value. Reserving a connector at the bulge 12, connecting the right-angle joint 6 at the connector by adopting a movable nut, connecting the high-pressure oil pipe 7 with two ends provided with movable nuts with the right-angle joint 6 and the high-pressure ball valve 4, and butting the high-pressure oil pipe 7 and the high-pressure ball valve 4 by adopting a second adapter 8. The high-pressure ball valve 4 is connected by adopting internal threads, and the high-pressure ball valve 4 is butted with the pressurizing device by adopting a first adapter 3. Before the experiment, an experiment sample tube needs to be fixed on a fixing device, and a clamping device is adopted to clamp and withhold the outer part of the inner core tube of the joint.

The device provided by the invention has the following use process:

(1) firstly, the design size of the joint inner core is determined according to the inner diameter and the length of the sample pipe and the size of the clamping device, the inner core is processed, and a connecting part interface is reserved. (2) And assembling the experimental sample tube, the inner core and the outer sleeve, and fastening by using a fastening press. (3) The right-angle joint, the adapter joint, the high-pressure oil pipe and the high-pressure ball valve are assembled together and connected with the reserved interface of the sample pipe inner core. (4) And clamping the outer part of the inner core pipe of the buckling joint by using a clamping device to fix the experimental sample pipe. (5) And the high-pressure ball valve is connected with the pressurizing device by adopting the adapter. And (5) finishing the installation.

After the installation is finished, experimental parameters are set according to a pre-designed test scheme, and a pressure test or other pressure tests are carried out. Experiment appearance pipe passes through clamping device in the experimentation and is fixed by better, and the joint of withholding simultaneously has guaranteed can not take place pressure and has revealed, is favorable to safe accurate completion experiment to reach the experiment purpose.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.