CN117782952A - Pipeline steel fatigue life test device under high-pressure gaseous hydrogen environment - Google Patents

Abstract

The invention relates to a pipeline steel fatigue life test device in a high-pressure gaseous hydrogen environment, which comprises a tank body, an upper gland and a lower gland, wherein a test cavity is arranged in the tank body, the upper gland and the lower gland are respectively and detachably wrapped and installed at the upper end and the lower end of the tank body, through holes matched with pipeline steel are respectively formed in the middle parts of the upper gland and the lower gland, sealing rings are respectively arranged at the inner sides of the through holes, the pipeline steel penetrates through the two ends of the tank body, the upper end and the lower end of the pipeline steel penetrate through the through holes and the sealing rings on the upper gland and the lower gland respectively, an air inlet nozzle and an air outlet nozzle which are communicated with the test cavity are arranged on the side wall of the tank body, the air inlet nozzle is connected with an air inlet pipeline, and the air outlet nozzle is connected with a pressure measuring device. The advantages are that: the device has the advantages of simple and reasonable structural design, simple sealing structure, convenient and quick disassembly of the upper gland and the lower gland, reduced test cost, improved test efficiency, small volume, small gas consumption, no major potential safety hazard even if hydrogen leakage occurs, and ensured safety of the test device.

Description

Pipeline steel fatigue life test device under high-pressure gaseous hydrogen environment

Technical Field

The invention relates to the technical field of pipeline steel high-pressure gaseous hydrogen environment compatibility tests, in particular to a pipeline steel fatigue life test device under a high-pressure gaseous hydrogen environment.

Background

The conventional upper cover of the hydrogen environment pipeline steel fatigue life performance testing device is mainly in a flange or clamp connection mode, the sealing O-shaped ring is arranged in the center of the flange, or the sealing O-shaped ring is in a gland and bolt mode, so that the device is large in size and complex in testing process.

The patent application 201420753372.7 discloses a quick-open type temperature-controllable material testing device for a high-pressure hydrogen environment, and aims to provide a quick-open type temperature-controllable high-pressure hydrogen environment box.

The patent application 201610505681.6 discloses a quick-opening high-pressure hydrogen environment material fatigue performance test device without dynamic seal, and the patent figure shows that the upper cover of the environment box adopts a flange/bolt connection mode.

Application number 202310430204.8 discloses a dynamic hydrogen-filled hydrogen-induced fatigue test device and a dynamic hydrogen-filled hydrogen-induced fatigue test method, wherein the dynamic hydrogen-filled hydrogen-induced fatigue test device and the dynamic hydrogen-filled hydrogen-induced fatigue test method simulate stress fluctuation of actual working conditions through application of fatigue load by a fatigue tester through an environment cavity and a hydrogen environment of cathode hydrogen-filled simulation equipment. The mechanical properties of the metal samples in a hydrogen environment were examined by varying the charging current density, charging time, applied load (stress control). The device does not involve a gaseous hydrogen environment tank.

The patent application 201810945320.2 discloses a vibration fatigue testing device and method under a high-pressure hydrogen environment, and the upper cover and the lower cover of an environment box can be seen from the figure to adopt flange/bolt connection.

The patent application No. 202210000259 discloses a method for testing the performance of a nonmetal sealing element in a high-pressure hydrogen environment, and aims to provide a method for testing the performance of the nonmetal sealing element in the high-pressure hydrogen environment, wherein an O-shaped ring sample to be tested is respectively embedded in a groove on the side edge and the upper surface of an O-shaped ring sample clamping frame, and a static load exposure test, a cyclic pressure fatigue test and a sealing performance test are carried out. The device is not connected with a testing machine, and the inspected object is a nonmetallic sealing piece.

The patent application No. 202111145751.9 discloses a slow tensile test device for pipeline steel in a hydrogen environment, and relates to a slow tensile test device for pipeline steel in a hydrogen environment, wherein an upper cover is also connected by adopting a flange/bolt.

The end seals in all the prior art mostly adopt a flange/bolt connection mode, so that the disassembly and assembly are complex, and the efficiency is low. Moreover, the problems of large capacity of the test chamber, large air inflow and high pressure exist, and the problems of large leakage risk and unsafe exist.

Based on the above, it is necessary to develop a test device with high safety and easy operation.

Disclosure of Invention

The invention aims to provide a pipeline steel fatigue life test device under a high-pressure gaseous hydrogen environment, and effectively overcomes the defects of the prior art.

The technical scheme for solving the technical problems is as follows:

the utility model provides a pipeline steel fatigue life test device under high pressure gaseous state hydrogen environment, including a jar body, go up gland and lower gland, the inside test chamber that is equipped with of above-mentioned jar, go up gland and lower gland respectively detachable sealed parcel and install the upper and lower end at the above-mentioned jar body, the middle part of going up gland and lower gland is equipped with the through-hole with pipeline steel adaptation respectively, the inboard of above-mentioned through-hole all is equipped with the sealing washer, the both ends that run through the above-mentioned jar body of pipeline steel, and its upper and lower end passes the through-hole and the sealing washer on above-mentioned upper gland and the lower gland respectively, the lateral wall of the above-mentioned jar body is equipped with the inlet nozzle and the outlet nozzle of intercommunication test chamber, the inlet pipeline is connected to the inlet nozzle, the pressure measurement ware is connected to the outlet nozzle.

On the basis of the technical scheme, the invention can be improved as follows.

Further, the air outlet nozzle is connected with the pressure measuring device through an air outlet pipe line.

Further, a pressure relief valve is arranged on the air outlet pipe line.

Further, the pressure gauge is a pressure gauge.

Further, a stop valve is provided on the intake pipe line.

Further, the tank body is a cylindrical tank body, the peripheries of the upper end and the lower end of the tank body are respectively provided with external threads, the upper gland and the lower gland are respectively round pipe-shaped cover bodies with one ends open, the inner side walls of the upper gland and the lower gland are respectively provided with internal threads, and the upper gland and the lower gland are respectively screwed at the upper end and the lower end of the tank body.

Further, a hole site for pipeline steel to pass through is arranged in the middle of the upper end of the tank body, an opening with the test cavity is arranged at the lower end of the tank body, a sealing groove is arranged around the opening, a sealing ring is arranged in the sealing groove, and the pipeline steel passes through the sealing ring.

Further, a first annular groove matched with the sealing ring in an embedded manner is formed in the periphery of the hole position at the upper end of the tank body and the inner side of the through hole of the upper gland, and a second annular groove matched with the sealing ring in an embedded manner is formed in the inner side of the through hole of the lower gland.

Further, the test chamber is a cylindrical chamber.

Further, the air inlet nozzle and the air outlet nozzle are distributed on two sides of the tank body.

The beneficial effects of the invention are as follows: the structure design is reasonable, effectively solves the problem of high fuel consumption rate of the high-horsepower tractor, and the disassembly and the maintenance are more convenient than the structure of the existing tractor.

Drawings

FIG. 1 is a schematic structural diagram of a pipeline steel fatigue life test device under a high-pressure gaseous hydrogen environment.

In the drawings, the list of components represented by the various numbers is as follows:

1. a tank body; 2. a gland is arranged; 3. a lower gland; 4. a seal ring; 5. a pressure gauge; 6. a stop valve; 11. an air inlet nozzle; 12. an air outlet nozzle; 13. and (3) a sealing ring.

Detailed Description

The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.

Examples: as shown in fig. 1, the device for testing fatigue life of pipeline steel in a high-pressure gaseous hydrogen environment of this embodiment includes a tank body 1, an upper gland 2 and a lower gland 3, a test cavity is provided inside the tank body 1, the upper gland 2 and the lower gland 3 are respectively detachably wrapped and mounted at the upper end and the lower end of the tank body 1, through holes adapted to the pipeline steel are respectively provided in the middle parts of the upper gland 2 and the lower gland 3, sealing rings 4 are respectively provided at the inner sides of the through holes, the pipeline steel penetrates through the two ends of the tank body 1, the upper end and the lower end of the pipeline steel penetrate through the through holes and the sealing rings 4 on the upper gland 2 and the lower gland 3 respectively, an air inlet nozzle 11 and an air outlet nozzle 12 which are communicated with the test cavity are provided on the side wall of the tank body 1, the air inlet nozzle 11 is connected with the air inlet pipeline, and the air outlet nozzle 12 is connected with the pressure measuring device 5.

In the use process, a pipeline steel test piece (A in the figure refers to) penetrates through a test cavity of the tank body 1, then an upper gland 2 and a lower gland 3 are arranged at two ends of the tank body 1, and when the upper gland 2 and the lower gland 3 are arranged, a sealing ring 4 is placed in advance, so that a good dynamic sealing effect can be achieved on the pipeline steel in the process of arranging the upper gland 2 and the lower gland 3. And then, high-pressure hydrogen is introduced into the test cavity through the air inlet nozzle 11, and the pressure gauge 5 monitors the pressure in the test cavity in real time in the test process, so that the pipeline steel is ensured to be in a high-pressure gaseous hydrogen environment. More specifically, the tank body 1 is made of L316 stainless steel, and an inner cavity is hollowed out to form a test cavity. The test cavity is small in size and small in gas consumption, is only slightly larger than the pipeline steel in size, and does not have major potential safety hazards even if hydrogen leakage occurs, so that the safety of the test device is ensured. Meanwhile, the upper gland 2 and the lower gland 3 are convenient to disassemble and assemble, and the operation is simple and convenient.

In this embodiment, the air outlet nozzle 12 is connected to the pressure gauge 5 through an air outlet pipe.

In this embodiment, a pressure relief valve is disposed on the air outlet line. After the test is finished, the pressure can be relieved by opening the pressure relief valve.

In this embodiment, the pressure gauge 5 adopts a conventional pressure gauge, and the specific model is adapted according to the actual use requirement, so that the pressure in the test cavity can be effectively monitored.

In this embodiment, the intake pipe line is provided with a stop valve 6. The intake state of the intake line can be controlled by opening and closing the shutoff valve 6.

In a preferred embodiment, the can 1 is a cylindrical can, outer peripheries of upper and lower ends thereof are respectively provided with external threads, the upper and lower caps 2 and 3 are respectively tubular caps having one ends thereof opened, inner side walls of the upper and lower caps 2 and 3 are respectively screwed to the upper and lower ends of the can 1, and inner side walls of the upper and lower caps are respectively provided with internal threads.

In the above embodiment, the upper gland 2 and the lower gland 3 are assembled with the can body 1 by screwing, and the operation is very simple and quick. The sealing ring 4 can be tightly pressed by tightening the upper gland 2 and the lower gland 3, so that dynamic sealing is realized between the pipeline steel test piece and the tank body 1. Compared with the design of the flange cover in the prior art, due to the limitation of the design of the flange cover, the tank body 1 is difficult to be made small, and the inner cavity of the tank body is larger, so that the technical scheme of the embodiment adopts the structural design of the screw gland, the tank body 1 can be miniaturized, the air inflow is greatly reduced, the safety performance of the test process is greatly improved, the tank body 1 can bear higher pressure, and meanwhile, the quick dismounting is easier to realize by the connection mode of the screw gland.

As a preferred embodiment, a hole site through which the pipeline steel passes is provided in the middle of the upper end of the tank body 1, an opening to the test chamber is provided in the lower end of the tank body, a sealing groove is provided around the opening, a sealing ring 13 is provided in the sealing groove, and the pipeline steel passes through the sealing ring 13.

In the above embodiment, the design of the lower end opening of the tank body 1 facilitates cleaning and maintenance of the inside of the test cavity, and simultaneously, the sealing between the opening and the pipeline steel test piece can be realized by matching the sealing ring 13 with the sealing groove, and the sealing structure of the upper gland 2 and the lower gland 3 with the sealing ring 4 is matched again, so that the sealing of the inside of the tank body 1 and the sealing between the tank body 1 and the pipeline steel test piece can be realized. Wherein, the diameter of the hole at one end of the tank body 1 is 0.2mm larger than that of the pipeline steel test piece.

In a preferred embodiment, a first annular groove for fitting the seal ring 4 is provided around the hole at the upper end of the can body 1 and inside the through hole of the upper gland 2, and a second annular groove for fitting the seal ring 4 is provided inside the through hole of the lower gland 3.

In the above embodiment, the design of the first annular groove facilitates the positioning and installation of the sealing ring 4 inside the upper gland 2. The design of the second annular groove is beneficial to positioning and mounting of the sealing ring 4 at the inner side of the lower gland 3, and displacement of the sealing ring 4 is avoided.

In this embodiment, the test chamber is a cylindrical chamber. The diameter of the test cavity is 0.5-1.5mm larger than that of the pipeline steel test piece, the volume of the test cavity is smaller, the hydrogen inlet amount is smaller, and the safety is greatly improved.

In this embodiment, the air inlet nozzle 11 and the air outlet nozzle 12 are distributed on two sides of the tank 1.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (10)

1. A pipeline steel fatigue life test device under high-pressure gaseous hydrogen environment is characterized in that: including jar body (1), go up gland (2) and gland (3) down, the inside test chamber that is equipped with of jar body (1), go up gland (2) and gland (3) detachable sealed parcel down respectively and install the last lower extreme of jar body (1), the middle part of going up gland (2) and gland (3) down is equipped with the through-hole with pipeline steel adaptation respectively, the through-hole inboard all is equipped with sealing washer (4), pipeline steel runs through the both ends of jar body (1), and go up lower extreme and pass respectively through-hole and sealing washer (4) on gland (2) and gland (3) down, the lateral wall of jar body (1) is equipped with the intercommunication inlet nozzle (11) and outlet nozzle (12) of test chamber, inlet pipe is connected to outlet nozzle (11), outlet nozzle (12) connect pressure measurer (5).

2. The device for testing the fatigue life of pipeline steel in a high-pressure gaseous hydrogen environment according to claim 1, wherein the device comprises: the air outlet nozzle (12) is connected with the pressure measuring device (5) through an air outlet pipe line.

3. The device for testing the fatigue life of pipeline steel in a high-pressure gaseous hydrogen environment according to claim 2, wherein: and a pressure relief valve is arranged on the air outlet pipe line.

4. The device for testing the fatigue life of pipeline steel in a high-pressure gaseous hydrogen environment according to claim 1, wherein the device comprises: the pressure measuring device (5) is a pressure measuring meter.

5. The device for testing the fatigue life of pipeline steel in a high-pressure gaseous hydrogen environment according to claim 1, wherein the device comprises: and a stop valve (6) is arranged on the air inlet pipe line.

6. The device for testing the fatigue life of pipeline steel in a high-pressure gaseous hydrogen environment according to claim 1, wherein the device comprises: the tank body (1) is a cylindrical tank body, external threads are respectively arranged on the peripheries of the upper end and the lower end of the tank body, the upper gland (2) and the lower gland (3) are respectively round pipe-shaped cover bodies with one open ends, internal threads are arranged on the inner side walls of the upper gland (2) and the lower gland (3) respectively screwed at the upper end and the lower end of the tank body (1).

7. The device for testing the fatigue life of pipeline steel in a high-pressure gaseous hydrogen environment according to claim 1, wherein the device comprises: the middle part of the upper end of the tank body (1) is provided with a hole site for pipeline steel to pass through, the lower end of the tank body is provided with an opening of the test cavity, the periphery of the opening is provided with a sealing groove, a sealing ring (13) is arranged in the sealing groove, and the pipeline steel passes through the sealing ring (13).

8. The device for testing the fatigue life of pipeline steel in a high-pressure gaseous hydrogen environment according to claim 7, wherein: the periphery of a hole position at the upper end of the tank body (1) and the inner side of a through hole of the upper gland (2) are provided with a first annular groove which is embedded and matched with the sealing ring (4), and the inner side of a through hole of the lower gland (3) is provided with a second annular groove which is embedded and matched with the sealing ring (4).

9. The device for testing the fatigue life of pipeline steel in a high-pressure gaseous hydrogen environment according to claim 1, wherein the device comprises: the test cavity is a cylindrical cavity.

10. The device for testing the fatigue life of pipeline steel in a high-pressure gaseous hydrogen environment according to claim 1, wherein the device comprises: the air inlet nozzles (11) and the air outlet nozzles (12) are distributed on two sides of the tank body (1).