High pressure sealing ring testing device and testing method

Abstract

The present invention relates to a high-pressure sealing ring testing device and a testing method, including a pressure chamber, the pressure chamber including a cylinder and a test piece mounting structure, one end of the cylinder is provided with a medium channel connected to the interior thereof; the test piece mounting structure includes an outer plug, an inner plug and an end cover, the outer plug is threadedly connected to the other end of the cylinder, the inner plug is installed in the circular hole of the outer plug, and the outer wall of the inner plug has an annular groove for mounting the test piece; the end cover axially presses the inner plug and the outer plug from the outer end, and the end cover is threadedly connected to the outer plug. The present invention can be used for testing of sealing rings of different wire diameters, different thicknesses, different sealing groove shapes, etc., and it is simple to assemble and easy to use; the method of the present invention tests the performance of the sealing ring at different temperatures and pressures, so that the performance evaluation of the sealing ring is more complete and comprehensive, and the test results are more reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of testing equipment, and in particular to a high-pressure sealing ring testing device and a testing method. Background Art

[0002] Sealing rings are common sealing parts. Various types of sealing rings are used in fidelity corers. The performance of sealing rings directly affects the pressure-maintaining performance of the fidelity chamber.

[0003] Existing sealing ring testing devices are usually used to check the sealing performance under normal pressure. Fidelity coring devices usually require high-pressure storage of cores. At this time, the sealing ring is in a high-pressure environment, and even qualified products under normal pressure may leak.

[0004] In addition, most existing sealing ring testing devices are used to test sealing rings of the same size. However, for a fidelity corer involving multiple sealing rings of different sizes, multiple testing devices are required, which is costly. Summary of the invention

[0005] The present invention aims to provide a high-pressure sealing ring testing device and a testing method, which are convenient for testing the sealing performance of the sealing ring under a high-pressure environment.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A high-pressure sealing ring testing device and a testing method, comprising a pressure chamber, the pressure chamber comprising a cylinder and a test piece mounting structure, one end of the cylinder is provided with a medium channel connected to the inside thereof, the other end of the cylinder is provided with a coaxial first threaded hole, the first threaded hole is connected to the inside of the cylinder;

[0008] The test piece installation structure comprises an outer plug, an inner plug and an end cover, wherein the outer plug is threadedly connected to the first threaded hole of the cylinder, and a circular hole matching the inner plug is provided on the outer plug, and the circular hole axially passes through the outer plug;

[0009] The inner plug is installed in the circular hole of the outer plug, and the outer wall of the inner plug is provided with an annular groove for installing the test piece;

[0010] The outer end of the inner plug is provided with a boss; the end cover axially presses the inner plug and the outer plug from the outer end so that the boss of the inner plug is axially close to the outer plug, and the end cover is threadedly connected with the cylinder or the outer plug.

[0011] Furthermore, a boss is provided at the outer end of the outer plug, and the end cover makes the boss of the outer plug axially close to the cylinder.

[0012] Furthermore, the circular hole of the outer plug is a stepped hole, and the end cover enables the boss of the inner plug to be closely attached to the step surface of the stepped hole.

[0013] Furthermore, a coaxial second threaded hole is provided at the other end of the cylinder, the second threaded hole is connected to the interior of the cylinder, a plug is installed in the second threaded hole, the plug is threadedly connected to the cylinder, the medium channel is provided on the plug, and the medium channel axially passes through the plug.

[0014] Furthermore, a pressure sensor interface is provided on the plug, and the pressure sensor interface is connected to the interior of the cylinder.

[0015] Preferably, a sealing ring is provided between the plug and the cylinder.

[0016] Furthermore, an installation space for installing a humidity sensor is provided between the inner plug and the outer plug, and the installation space is located at the outer end of the test piece.

[0017] A method for testing a high-pressure sealing ring, the method using the above-mentioned high-pressure sealing ring testing device for testing, comprises the following steps:

[0018] S1, installing the test piece in the annular groove on the outer wall of the inner plug, installing a humidity sensor between the outer wall of the inner plug and the inner wall of the outer plug, and the humidity sensor is located at the outer end of the test piece;

[0019] S2, inject fluid medium into the cylinder through the medium channel, maintain the pressure for a certain period of time, and test the sealing performance of the test piece.

[0020] Preferably, the medium channel is connected to an external hydraulic source, the output pressure of the hydraulic source is changed, and the sealing performance of the test piece under different pressures is tested.

[0021] Further preferably, the liquid medium is heated to test the sealing performance of the test piece at different temperatures.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention can be used for testing of sealing rings with different wire diameters, different thicknesses, different sealing groove shapes, etc. For different test conditions, it is only necessary to change the diameter of the inner plug, the shape of the annular groove, and the wall thickness of the outer plug, without replacing the entire test device. The assembly is simple and the use is convenient;

[0024] 2. The present invention can provide a high-pressure environment for the performance test of the sealing ring, and can test the sealing performance of the sealing ring under a high-pressure environment;

[0025] 3. The method of the present invention tests the performance of the sealing ring at different temperatures and pressures, so that the performance evaluation of the sealing ring is more complete and comprehensive, the test result is more reliable, and it is beneficial to ensure the fidelity performance of the fidelity corer. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the pressure cabin in the present invention;

[0027] Figure 2 It is a schematic diagram of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0029] like Figure 1 As shown, the high-pressure sealing ring testing device disclosed in the present invention comprises a pressure chamber 10, and the pressure chamber 10 comprises a cylinder 1 and a test piece mounting structure.

[0030] Both ends of the cylinder 1 have coaxial threaded holes, which are connected to the interior of the cylinder 1. A plug 21 is installed in the threaded hole at one end, and the plug 21 is threadedly connected to the cylinder 1. The plug 21 is provided with a medium channel 22 and a pressure sensor interface 23, which axially penetrate the plug 21, and the medium channel 22 can be connected to an external hydraulic source as an injection port.

[0031] The test piece installation structure includes an outer plug 31, an inner plug 32 and an end cover 33. The outer plug 31 is threadedly connected to the threaded hole at the other end of the cylinder 1. The outer plug 31 is provided with a circular hole adapted to the inner plug 32, and the circular hole axially passes through the outer plug 31.

[0032] The inner plug 32 is installed in the circular hole of the outer plug 31 . The outer wall of the inner plug 32 is provided with an annular groove for installing the test piece 4 . The circular hole of the outer plug 31 is a stepped hole.

[0033] The outer ends of the inner plug 32 and the outer plug 31 are both provided with bosses 34; the end cover 33 axially presses the inner plug 32 and the outer plug 31 from the outer end, so that the boss 34 of the outer plug 31 is axially close to the end face of the cylinder 1, and the boss 34 of the inner plug 32 is axially close to the step surface of the stepped hole of the outer plug 31, and the end cover 33 is threadedly connected to the cylinder 1 or the outer plug 31.

[0034] The plug 21 and the outer plug 31 are both installed with the inner wall of the cylinder 1 using a sealing ring 24 and a retaining ring to form a seal.

[0035] An installation space 35 for installing a humidity sensor or a moisture sensor is provided between the inner plug 32 and the outer plug 31, and the installation space 35 is located at the outer end of the test piece 4. In this embodiment, a groove is machined on the outer wall of the inner plug 32 to form the installation space 35, and the installation space 35 is located between the annular groove and the boss 34 of the inner plug 32. By installing a humidity sensor or a moisture sensor in the installation space 35 and detecting the humidity condition there, it can be determined whether the sealing of the test piece 4 has failed.

[0036] Of course, the sealing performance test also includes the following two methods: Method 1: Add fluorescent agent to the liquid medium entering the pressure chamber 10. After the test, the leakage path can be detected by using a fluorescence meter. Method 2: Install multiple acoustic emission sensors and use an acoustic detector to perform valve leakage detection. Of course, these two methods can also be used at the same time.

[0037] The invention only needs to change the diameter of the inner plug and the wall thickness of the outer plug for sealing rings of different sizes, and is simple to assemble and convenient to use. The pressure chamber can provide a high-pressure environment for the performance test of the sealing ring, and can test the sealing performance of the sealing ring under the high-pressure environment.

[0038] The present invention discloses a method for testing a high-pressure sealing ring, which utilizes the above-mentioned high-pressure sealing ring testing device to perform testing, and comprises the following steps:

[0039] S1, install the test piece 4 in the annular groove on the outer wall of the inner plug 32, play a sealing role between the inner plug 32 and the outer plug 31, and install the humidity sensor in the installation space 35;

[0040] S2, injecting fluid medium into the cylinder 1 through the medium channel 22, maintaining the pressure for a certain period of time, judging whether the sealing of the test piece 4 fails through the detection data of the humidity sensor or the moisture sensor, and then testing the sealing performance of the test piece 4.

[0041] In the present invention, the medium channel 22 is used as an injection port to connect to an external hydraulic source. Figure 2 As shown, the external hydraulic source system in the present invention includes a pressure supply unit, a pressure cabin 10, a data acquisition and analysis unit and a control unit 2. The pressure supply unit is connected to the pressure cabin 10 through a pipeline to adjust the pressure in the pressure cabin 10; the data acquisition and analysis unit includes a pressure sensor 14 and a temperature sensor 15, and the pressure supply unit and the data acquisition and analysis unit are both connected to the control unit 2. The control unit 2 includes a computer host and a display terminal. The display terminal adopts a touch screen and can display test data in real time and control the power unit in real time.

[0042] The pressure supply unit includes a power supply system and an ultra-high pressure boosting system. The entire system can be computer controlled and can output and control 0-100 MPa pressure at will. In this embodiment, the ultra-high pressure boosting system is an ultra-high pressure gas-driven boosting system, which includes a low-pressure pump 12 and a high-pressure pump 13.

[0043] The power supply system is a gas pressure supply system, which is connected to the high-pressure pump 13 to provide driving force for the high-pressure pump 13. The medium output by the low-pressure pump 12 is delivered to the pressure cabin 10 after passing through the high-pressure pump 13. When high-pressure output is required, the medium output by the low-pressure pump 12 is pressurized by the high-pressure pump 13 and delivered to the pressure cabin 10.

[0044] The gas pressure supply system uses an oil-free silent air compressor, which can achieve a pressure output of 0.1-0.8Mpa and provide power for the ultra-high pressure gas drive booster system. One of them is provided for reference in this embodiment, model WP1100-3 / 140, motor power 3600W, speed 1400r / min.

[0045] The output pressure of the ultra-high pressure boosting system is proportional to the driving air pressure, with low gas consumption: 0.3-1m3 / min. At high pressure, the pump output flow is 0.3L / min, and the pressure test range is: 0-200Mpa. The ultra-high pressure pipeline adopts high-pressure steel pipe, and the pipeline seal adopts ball head or cone hard seal.

[0046] In the present invention, the test fluid system and the driving fluid system are separated and the test media are diversified.

[0047] The data acquisition and analysis unit is used to realize pressure monitoring, temperature monitoring and internal strain monitoring of the pressure chamber 10. The data acquisition and analysis unit includes various measuring elements and a data acquisition and analysis system. The measuring elements include pressure sensors, temperature sensors, etc.

[0048] The pressure monitoring consists of two pressure monitoring channels, one for monitoring the pump station outlet pressure and the other for monitoring the internal pressure of the pressure chamber 10. The pump station outlet pressure is monitored by installing a pressure sensor 14 at the outlet of the pressure supply unit. The internal pressure of the pressure chamber 10 is achieved by installing a pressure sensor on the pressure chamber 10.

[0049] Of course, in addition to the hardware part, the system also includes monitoring software, which can realize the integrated display of the ultra-high pressure boosting system pressure data and the internal pressure data of the pressure chamber 10 on the same software platform, and can record the pressure changes in the pressure chamber 10 in real time.

[0050] The present invention can be used to test the sealing performance of the sealing ring under different pressures. After maintaining the pressure for a specified time, the system performs safe pressure relief, and the specified pressure maintaining time is set according to experimental needs.

[0051] In another embodiment, the liquid medium is heated during the test to test the sealing performance of the test piece 4 at different temperatures. The heater can be arranged before the low-pressure pump. It can also be heated by arranging an annular steam heat pipe, a resistance wire, or an eddy current heating system outside the pressure chamber 2, or by water bath heating. During the heating process, the temperature is monitored by a temperature measuring unit.

[0052] The temperature monitoring unit can select the MWT202 integrated temperature transmitter, which consists of three parts: temperature sensor, compensation circuit and conversion circuit. It has the advantages of stable performance, high sensitivity and strong reliability.

[0053] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. High-pressure sealing ring testing device, characterized in that: The pressure chamber comprises a cylinder and a test piece mounting structure, one end of the cylinder is provided with a medium channel connected to the inside thereof, and the other end of the cylinder is provided with a coaxial first threaded hole, the first threaded hole is connected to the inside of the cylinder; The test piece installation structure includes an outer plug, an inner plug and an end cover, wherein the outer plug is threadedly connected to the first threaded hole of the cylinder, and a circular hole matching the inner plug is provided on the outer plug, and the circular hole axially penetrates the outer plug; the inner plug is installed in the circular hole of the outer plug, and an annular groove for installing the test piece is provided on the outer wall of the inner plug; The outer end of the inner plug has a boss; the end cover axially presses the inner plug and the outer plug from the outer end so that the boss of the inner plug axially presses against the outer plug, and the end cover is threadedly connected with the cylinder or the outer plug; An installation space for installing a humidity sensor or a moisture sensor is provided between the inner plug and the outer plug, the installation space is located at the outer end of the test piece, and the humidity sensor or the moisture sensor is installed in the installation space; The outer end of the outer plug is provided with a boss, and the end cover makes the boss of the outer plug axially close to the cylinder body. The circular hole of the outer plug is a stepped hole, and the end cover makes the boss of the inner plug close to the step surface of the stepped hole; one end of the cylinder body has a coaxial second threaded hole, and the second threaded hole is connected to the inside of the cylinder body; By changing the diameter of the inner plug, the shape of the annular groove and the wall thickness of the outer plug, the sealing performance of sealing rings with different wire diameters, different thicknesses and different sealing groove shapes can be tested.

2. The high pressure sealing ring testing device according to claim 1, characterized in that: A plug is installed in the second threaded hole, the plug is threadedly connected to the cylinder, the medium channel is arranged on the plug, and the medium channel axially penetrates the plug.

3. The high pressure sealing ring testing device according to claim 2, characterized in that: The plug is also provided with a pressure sensor interface, which is connected to the interior of the cylinder.

4. The high pressure sealing ring testing device according to claim 2 or 3, characterized in that: A sealing ring is arranged between the plug and the cylinder.

5. The testing method of high pressure sealing ring is characterized by: The high pressure sealing ring testing device according to any one of claims 1 to 4 is used for testing, comprising the following steps: S1, installing the test piece in the annular groove of the outer wall of the inner plug, installing a humidity sensor or a moisture sensor between the outer wall of the inner plug and the inner wall of the outer plug, the humidity sensor or the moisture sensor being located at the outer end of the test piece; S2, inject fluid medium into the cylinder through the medium channel, maintain the pressure for a certain period of time, and test the sealing performance of the test piece.

6. The testing method according to claim 5, characterized in that: Connect the medium channel to an external hydraulic source, change the output pressure of the hydraulic source, and test the sealing performance of the test piece under different pressures.

7. The testing method according to claim 5 or 6, characterized in that: The liquid medium is heated and the sealing performance of the test piece is tested at different temperatures.

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