Device for testing hydrogen atmosphere airtightness of high-temperature hydrogen-carrying kettle and optical cable outer protective tube

Abstract

The utility model provides a high-temperature hydrogen-carrying kettle and an optical cable outer protective tube hydrogen atmosphere airtightness testing device, the high-temperature hydrogen-carrying kettle comprises a kettle body, and the kettle body comprises a hollow cavity used for accommodating a rigid tube body and testing gas; ports are formed in the two ends of the kettle body and used for allowing the rigid pipe body to extend out of the kettle body, the pipe wall of the rigid pipe body is in sealed connection with the kettle body at the ports, and the pipe opening of the rigid pipe body is subjected to sealing treatment; a test gas detector communicated with the interior of the rigid pipe body is arranged outside the kettle body; an air vent communicated with the cavity is formed in the kettle body and is used for introducing test gas or discharging residual gas in the cavity; a heating layer is wrapped outside the kettle body and is used for heating the kettle body to a preset high temperature. According to the utility model, the gas permeation condition of the rigid pipe body can be tested in real time.

Description

Technical Field

[0001] The utility model belongs to the field of airtightness testing of steel pipes in a hydrogen atmosphere, and particularly relates to a high-temperature hydrogen-carrying kettle and an airtightness testing device for an optical cable outer sheath in a hydrogen atmosphere. Background Art

[0002] The hydrogen loss of optical fibers is caused by hydrogen in some external environments penetrating into the optical cable under certain conditions during the use of the optical cable. In order to block hydrogen in the external environment from entering the optical fiber, it is usually necessary to increase the requirement of blocking hydrogen for the outer sheath of the optical cable. Then, it is necessary to perform an airtightness test on the outer sheath in a hydrogen atmosphere.

[0003] The outer sheath of an optical cable is usually a metal pipe body with a certain diameter. In the prior art, the airtightness test of the metal pipe body usually uses an underwater environment and nitrogen is introduced for testing, such as the disclosed patent CN204085804U. However, this structure cannot test the penetration of hydrogen atmosphere and cannot accurately monitor the specific gas leakage volume in real time.

[0004] Another type of hydrogen-carrying test related to this field, such as the disclosed patent CN220969158U, its test object is optical fibers or optical cables, and it cannot test rigid pipe bodies. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a high-temperature hydrogen-carrying kettle and an airtightness testing device for an optical cable outer sheath in a hydrogen atmosphere, which can perform real-time testing on the gas penetration of rigid pipe bodies.

[0006] The technical solution adopted by the utility model to solve the above technical problem is: a high-temperature hydrogen-carrying kettle, including a kettle body, the kettle body includes a hollow cavity for accommodating a rigid pipe body and a test gas;

[0007] Both ends of the kettle body are provided with ports for the rigid pipe body to extend out of the kettle body. The pipe wall of the rigid pipe body is hermetically connected to the kettle body at the ports, and the pipe orifice of the rigid pipe body is hermetically treated; a test gas detector communicating with the inside of the rigid pipe body is arranged outside the kettle body;

[0008] The kettle body is provided with a vent hole communicating with the cavity for introducing the test gas or discharging the remaining gas in the cavity;

[0009] The outside of the kettle body is wrapped with a heating layer for heating the kettle body to a preset high temperature.

[0010] According to the above scheme, the pipe wall of the rigid pipe body is hermetically connected to the kettle body at the ports through a graphite sealing stuffing box.

[0011] According to the above solution, the graphite sealing stuffing box includes an inner support sheet, packing, a retaining ring, a gland, and a compression nut that are sequentially sleeved on the rigid pipe body at the port, wherein the compression nut is threadedly connected to the port of the kettle body.

[0012] According to the above solution, the heating layer is a high-temperature oil jacket, and the high-temperature oil jacket is connected to an external oil tank through a high-temperature circulation pump, and a heating unit is provided in the oil tank.

[0013] According to the above solution, a heat-insulating layer is further wrapped outside the heating layer.

[0014] According to the above solution, the vent is connected with a vent valve and / or a pressure gauge, which is used to control the intake and exhaust volume and / or monitor the gas pressure in the cavity during the test.

[0015] According to the above solution, one end of the rigid pipe body is sealed by a ferrule, the other end of the pipe opening is connected with a detection pipeline, the test gas detector is arranged on the detection pipeline, and the end of the detection pipeline is connected with a gas collection device.

[0016] According to the above solution, a vent valve and / or a leak detection pressure gauge are further provided in the detection pipeline.

[0017] According to the above solution, the rigid pipe body is the outer protection pipe of an oil well optical cable, the cavity is a cylinder with a diameter larger than the outer protection pipe, the test gas is a hydrogen atmosphere, and the test gas detector is a hydrogen detector.

[0018] As the second aspect of the present invention, the present invention further provides a hydrogen atmosphere airtightness test device for an optical cable outer protection pipe, which includes the above-mentioned high-temperature hydrogen-carrying kettle, and further includes a test chamber, an intake system, an exhaust system, a vacuum system, and a constant temperature system;

[0019] The intake system is connected to the vent and is used to introduce a test gas into the cavity;

[0020] The exhaust system is connected to the vent and is used to discharge the remaining gas in the cavity;

[0021] The vacuum system is connected to the vent and is used to evacuate the cavity;

[0022] The constant temperature system is connected to the heating layer of the kettle body and is used to heat the kettle body to a certain temperature;

[0023] The test chamber is used to place the high-temperature hydrogen-carrying kettle, and a leakage alarm is provided in the test chamber.

[0024] The beneficial effects of the present invention are:

[0025] 1. By improving the structure of the kettle body, it is possible to conduct an airtightness test on the rigid pipe body for specific test gases; after the rigid pipe body extends outside the kettle body structure, it is directly connected to a test gas detector, which can detect the gas leakage of the test gas in real time.

[0026] 2. By adopting the present utility model, it is possible to detect the hydrogen atmosphere airtightness of the outer protective pipe of the optical cable in real time during the test, with a simple structure and convenient and fast detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of a hydrogen-containing kettle according to an embodiment of the present utility model.

[0028] Figure 2 is Figure 1 a schematic structural diagram of the graphite sealing stuffing box in

[0029] Figure 3 It is a schematic structural diagram of an airtightness test device according to an embodiment of the present utility model.

[0030] In the figure:

[0031] 1 - kettle body, 101 - first ventilation port, 102 - second ventilation port, 111 - first port, 112 - second port;

[0032] 2 - graphite sealing stuffing box, 21 - compression nut, 22 - gland, 23 - retaining piece, 24 - packing, 25 - inner support piece;

[0033] 3 - rigid pipe body, 4 - heating layer, 5 - heat preservation layer, 6 - detection pipeline, 7 - test gas detector;

[0034] 81 - first ventilation valve, 82 - second ventilation valve;

[0035] 91 - first pressure gauge, 92 - second pressure gauge, 93 - leak detection pressure gauge;

[0036] 01 - hydrogen-containing kettle, 02 - test chamber, 021 - leakage alarm, 03 - intake system, 04 - exhaust system, 05 - vacuum system, 06 - constant temperature system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0038] In the description of this embodiment, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0039] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "attachment", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] The present utility model provides a high-temperature hydrogen-carrying kettle and a hydrogen atmosphere airtightness testing device for an optical cable outer sheath tube, which can perform real-time testing of the gas permeation situation of a rigid pipe body.

[0041] As Figure 1 shown, a high-temperature hydrogen-carrying kettle includes a kettle body 1. The kettle body 1 includes a hollow cavity for accommodating a rigid pipe body 3 and a test gas. Both ends of the kettle body 1 are provided with ports for the rigid pipe body to extend out of the kettle body 1. The pipe wall of the rigid pipe body 3 is hermetically connected to the kettle body 1 at the ports, and the pipe orifice of the rigid pipe body 1 is hermetically treated. A test gas detector 7 communicating with the inside of the rigid pipe body 3 is provided outside the kettle body 1. The kettle body 1 is provided with a ventilation port communicating with the cavity for introducing the test gas or discharging the remaining gas in the cavity. The outside of the kettle body 1 is wrapped with a heating layer 4 for heating the kettle body 1 to a preset high temperature.

[0042] The rigid pipe body 3 is a concept opposite to the flexible pipe body, representing a tubular structure that is not easily deformed under normal conditions, generally made of metal or plastic materials such as steel pipes, aluminum pipes, PVC pipes, etc. In the application scenario of this embodiment, the rigid pipe body 3 is the outer sheath tube of an oil well optical cable, and steel pipes or aluminum pipes are mostly used. Since the outer diameter of the outer sheath tube is 6.35 mm and the outer shape is a circular structure, the cavity of the kettle body 1 is designed as a cylindrical structure with a diameter greater than 6.35 mm. It can also be used to test the airtightness of other rigid pipe bodies with an outer diameter less than 6.35 mm.

[0043] The tube wall of the rigid tube body 3 is hermetically connected to the kettle body 1 at the port by compressing packing. In this embodiment, the port includes a first port 111 and a second port 112. Both ends of the rigid tube body 3 extend to the outside of the kettle body 1 from the first port 111 and the second port 112 respectively, and then are hermetically connected through a graphite sealing stuffing box 2. The specific structure of the graphite sealing stuffing box 2 is as Figure 2 shown. After the rigid tube body 3 passes through the first port 111 and the second port 112, an inner support sheet 25, packing 24, a retaining piece 23 and a gland are sequentially placed at the port. Finally, it is tightly fixed with a compression nut 21. The packing 24 is graphite. By using the graphite sealing stuffing box 2 for sealing, good airtightness between the rigid tube body 3 and the kettle body 1 is ensured. To make the hydrogen-containing kettle more versatile, the diameter of the port is larger than the maximum diameter of the rigid tube to be tested, and then graphite sealing stuffing boxes corresponding to different diameters of the rigid tube are set.

[0044] The high temperature is the preset temperature required to meet the airtightness test. By providing a heating layer 4, the kettle body 1 is heated to meet the high-temperature test conditions required for the airtightness test. In this embodiment, the heating layer 4 is a high-temperature oil jacket, and the high-temperature oil jacket is connected to an external oil tank through a high-temperature circulation pump. A heating unit is provided in the oil tank. The high-temperature oil jacket can heat the kettle body to a high temperature of 300 °C.

[0045] Furthermore, a heat-insulating layer is wrapped outside the heating layer 4, which can achieve a good heat-insulating effect and save the energy used for heating.

[0046] The number of the air vents is at least 1. In this embodiment, two are provided, namely a first air vent 101 and a second air vent 102, which are respectively arranged at both ends of the kettle body 1. The first air vent 101 and the second air vent 102 are respectively connected with a first pressure gauge 91 and a second pressure gauge 92, which are used to monitor the inlet pressure and the gas pressure in the cavity during the test. A second air vent valve 81 is also provided at the second air vent 102, which is used for rapid air release in case of emergency.

[0047] Preferably, the nozzle at one end of the rigid pipe body 3 is sealed by a ferrule. The nozzle at the other end of the rigid pipe body 3 is connected to a detection pipeline 6, and a test gas detector 7 is arranged on the detection pipeline 6. The test gas detector 7 can display the amount of test gas in real time. When test gas penetrates into the rigid pipe body 3, the test gas detector 7 connected to the inside of the rigid pipe body 3 can collect and display it, so as to realize real-time testing without separately adding test equipment. In this embodiment, the test gas is a hydrogen atmosphere, and the test gas detector 7 is a hydrogen detector. Therefore, a gas collection device is connected to the end of the detection pipeline 6. If test gas penetrates into the rigid pipe body 3, it will be collected by the gas collection device and processed uniformly to avoid polluting the environment or causing an explosion.

[0048] In order to make the detection pipeline 6 more controllable, a first ventilation valve 81 and / or a leak detection pressure gauge 93 are also provided in the detection pipeline 6. The first ventilation valve 81 can adjust the ventilation volume, and the leak detection pressure gauge 93 can judge whether the connection between the detection pipeline 6 and the nozzle of the rigid pipe body 3 is tight.

[0049] As the second aspect of the present utility model, the present utility model also provides an optical cable outer sheath hydrogen atmosphere airtightness test device, as Figure 3 shown, including the high-temperature hydrogen-carrying kettle 01 described above, and also including a test chamber 02, an air inlet system 03, an exhaust system 04, a vacuum system 05 and a constant temperature system 06. The air inlet system 04 is connected to the first ventilation port and is used to introduce test gas into the cavity; the exhaust system 04 is connected to the first ventilation port and is used to discharge the remaining gas in the cavity; the vacuum system 05 is connected to the first ventilation port and is used to evacuate the cavity; the constant temperature system 06 is connected to the heating layer of the kettle body and is used to heat the kettle body to a certain temperature; the test chamber 02 is used to place the high-temperature hydrogen-carrying kettle 01. The test chamber 02 is closed during the test, which is equivalent to a protective cover and plays a safety protection role. A ventilation device runs in the test chamber 02 for a long time and a leakage alarm 021 is provided. When test gas leaks, it can identify and alarm. When explosive gas such as hydrogen atmosphere leaks into the air, it can be detected early to avoid accidents. The air inlet system 03, the exhaust system 04, the vacuum system 05 and the constant temperature system 06 are all conventional equipment. Cut-off valves, control valves, pressure gauges, etc. can be added to the pipeline according to actual needs, and they are also all conventional settings, so their detailed structures will not be repeated here.

[0050] The present utility model has improved the kettle body and the sealing details, thereby realizing the airtightness test of the rigid pipe body. At the same time, a test gas detector connected to the inside of the rigid pipe body is provided, which can judge the airtightness in real time during the test and display the gas leakage amount, without separately adding test equipment.

[0051] It should be understood that those of ordinary skill in the art can make improvements or transformations according to the above description, and all such improvements and transformations shall fall within the protection scope of the appended claims of this utility model.

Claims

1. A high-temperature hydrogen-carrying autoclave, comprising an autoclave body, characterized in that: The autoclave body includes a hollow cavity for accommodating a rigid pipe body and a test gas; Both ends of the autoclave body are provided with ports for the rigid pipe body to extend out of the autoclave body. The pipe wall of the rigid pipe body is hermetically connected to the autoclave body at the ports, and the pipe orifice of the rigid pipe body is hermetically treated. A test gas detector communicating with the inside of the rigid pipe body is arranged outside the autoclave body; The autoclave body is provided with a vent communicating with the cavity for introducing the test gas or discharging the remaining gas in the cavity; The outside of the autoclave body is wrapped with a heating layer for heating the autoclave body to a preset high temperature.

2. The high-temperature hydrogen-loading autoclave according to claim 1, wherein: The pipe wall of the rigid pipe body is hermetically connected to the autoclave body at the ports through a graphite sealing stuffing box.

3. The high-temperature hydrogen-containing autoclave according to claim 2, wherein: The graphite sealing stuffing box includes an inner support sheet, a packing, a retaining sheet, a gland and a compression nut that are sequentially sleeved on the rigid pipe body at the ports, wherein the compression nut is threadedly connected to the port of the autoclave body.

4. The high-temperature hydrogen-loading autoclave according to claim 1, wherein: The heating layer is a high-temperature oil jacket, and the high-temperature oil jacket is connected to an external oil tank through a high-temperature circulating pump, and a heating unit is arranged in the oil tank.

5. The high-temperature hydrogen-loading autoclave according to claim 1 or 4, characterized in that: The outside of the heating layer is further wrapped with a heat-insulating layer.

6. The high-temperature hydrogen-carrying autoclave according to claim 1, wherein: The vent is connected with a vent valve and / or a pressure gauge for controlling the intake and exhaust volume and / or monitoring the gas pressure in the cavity during the test.

7. The high-temperature hydrogen-loading autoclave according to claim 1, wherein: One end orifice of the rigid pipe body is sealed by a ferrule, the other end orifice is connected with a detection pipeline, the test gas detector is arranged on the detection pipeline, and the end of the detection pipeline is connected with a gas collection device.

8. The high-temperature hydrogen-carrying kettle according to claim 7, characterized in that: A vent valve and / or a leak detection pressure gauge is further arranged in the detection pipeline.

9. The high-temperature hydrogen-loading autoclave according to claim 1 or 7, characterized in that: The rigid pipe body is an outer protective pipe of an oil well optical cable, the cavity is a cylinder with a diameter larger than the outer protective pipe, the test gas is a hydrogen atmosphere, and the test gas detector is a hydrogen detector.

10. An airtightness test device for the outer protective tube of an optical cable in a hydrogen atmosphere, characterized in that: Comprising the high-temperature hydrogen-carrying autoclave according to any one of claims 1 to 9, further comprising a test chamber, an intake system, an exhaust system, a vacuum system and a constant temperature system; The intake system is connected to the vent for introducing a test gas into the cavity; The exhaust system is connected to the vent for discharging the remaining gas in the cavity; The vacuum system is connected to the vent for evacuating the cavity; The constant temperature system is connected to the heating layer of the autoclave body for heating the autoclave body to a certain temperature; The test chamber is used for placing the high-temperature hydrogen-carrying autoclave, and a leak alarm is arranged in the test chamber.

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