Device and method for measuring membrane rupture pressure of high-pressure gas

Abstract

The invention provides a high-pressure gas membrane rupture pressure measuring device and a measuring method thereof, and belongs to the technical field of pressure measurement. The measuring device comprises a pressure generation system, a gas compression system, a gas injection system, a pressure measuring system and a diaphragm clamping system. The piston divides the cavity into a hydraulic cavity and a gas compression cavity, and the piston is hydraulically driven to compress the pre-filled gas, so that the diaphragm is broken. The pressure measurement system records pressure-time data in real time, and a sliding window average algorithm is adopted to extract a membrane rupture pressure peak value. According to the technical scheme, inert gas is used, initiating explosive devices are not used, membrane rupture energy is only gas expansion, the protection box can absorb fragments, and explosion-proof transformation is not needed in a laboratory. And the smoothed unique membrane rupture pressure value is output through a sliding window averaging algorithm, and manual reading errors are eliminated. According to the technical scheme, the device is compact in structure, safe to operate, rapid in testing and suitable for accurately measuring the diaphragm rupture pressure of the gas gun diaphragm in a conventional laboratory.

Description

Technical Field

[0001] This application relates to the field of pressure measurement technology, and more specifically, to a measuring device and method for measuring the rupture pressure of high-pressure gas. Background Technology

[0002] With the development of mobile technology, gas cannons have become a crucial technology for driving projectiles to achieve hypersonic launches. They play a vital role in materials dynamics experiments and hypersonic impact tests. The pressure parameters of the gas inside the gas cannon are a key factor determining its launch capability. One important way to control these pressure parameters is by selecting diaphragms with different materials, thicknesses, and groove depths. Both single-stage and multi-stage gas cannon launch technologies rely heavily on the widespread use of diaphragms. The diaphragm burst pressure directly affects the motion of the piston and projectile, making it a critical parameter in internal ballistics research; therefore, accurate measurement of the diaphragm burst pressure is essential. On the other hand, due to differences in material mechanical properties and variations in processing, the actual burst pressure can differ even with the same diaphragm processing parameters. To control the burst pressure of each batch of diaphragms within a specified range, it is necessary to sample and test the burst pressure of each batch. If the burst pressure test meets the requirements, batch processing proceeds according to the specified dimensions and process. If the test results do not meet the requirements, the diaphragm thickness or groove depth, etc., are adjusted based on the actual burst pressure until the test results are satisfactory before batch processing can begin. Rapid measurement of membrane rupture pressure is an important means of ensuring the consistency of membrane rupture pressure in batch processing.

[0003] Currently, methods for determining diaphragm rupture pressure include hydrostatic rupture testing, hydraulic rupture testing, and gas-fired rupture testing. Hydrostatic rupture testing suffers from drawbacks such as high cost and complex operation due to the poor compressibility of water, requiring sophisticated compression equipment. Hydraulic rupture testing has lower equipment requirements and is simpler to operate, but it suffers from problems such as hydraulic oil splashing out during diaphragm rupture and diaphragm debris mixing into the hydraulic oil. The former is dangerous for operators, while the latter may require additional filtration equipment or cause permanent damage to the equipment due to filtration issues. Gas-fired rupture testing involves filling a confined space with flammable gas or using a pressure-generating explosive charge ignited by an ignition device to measure the rupture pressure. This involves the loading and detonation of flammable materials, making the method complex and less safe, and unsuitable for rupture pressure testing in conventional laboratories.

[0004] Therefore, there is an urgent need for a measuring device and method for measuring the rupture pressure of high-pressure gas to solve one of the aforementioned technical problems. Summary of the Invention

[0005] The purpose of this application is to provide a measuring device and method for measuring the rupture pressure of high-pressure gas, which can solve at least one of the technical problems mentioned above. The specific solution is as follows:

[0006] According to a specific embodiment of this application, this application provides a measuring device for high-pressure gas rupture pressure, comprising:

[0007] A pressure generation system is used to provide controllable propulsion pressure;

[0008] A gas compression system for compressing gas; comprising a chamber and a piston; the piston divides the interior of the chamber into a non-communicating hydraulic chamber and a gas compression chamber;

[0009] The gas injection system is used to pre-charge the gas compression chamber with gas to increase the initial pressure;

[0010] A pressure measurement system is used to monitor and record pressure data in the gas compression chamber and determine the rupture pressure value based on the pressure data; it includes a pressure sensor installed on the gas compression chamber and a data processing unit for data acquisition and processing.

[0011] A diaphragm clamping system for fixing and sealing the diaphragm to be tested;

[0012] The pressure generating system compresses the gas in the gas compression chamber by driving the piston to move.

[0013] The gas pressure in the gas compression chamber is used to rupture the diaphragm under test and obtain the rupture pressure of the diaphragm under test.

[0014] Furthermore, the data processing unit uses a sliding window averaging algorithm to smooth the pressure-time series data collected by the pressure sensor, and determines the maximum value in the smoothed data series as the membrane rupture pressure of the membrane to be tested.

[0015] Furthermore, the pressure generating system includes a hydraulic pump station and hydraulic oil lines; the hydraulic lines are connected to the hydraulic chamber to drive the piston to move.

[0016] Furthermore, the gas injection system includes a gas source, a connecting pipeline, and a control valve; the gas source is a high-pressure nitrogen cylinder or a compressed air source; the connecting pipeline is connected to the gas compression chamber.

[0017] Furthermore, the diaphragm clamping system, located at the outlet of the gas compression chamber, includes a pair of clamping rings with central openings and a sealing element. The diaphragm to be tested is clamped between the pair of clamping rings, and the sealing element is provided on the contact surface between the clamping rings and the diaphragm to be tested.

[0018] Furthermore, the outlet of the gas compression chamber is sealed to the diaphragm clamping system, so that the gas compression chamber, the diaphragm clamping system and the external environment form a closed space.

[0019] Furthermore, the measuring device also includes a protective box for collecting debris generated when the diaphragm ruptures; the diaphragm clamping system is installed at the inlet end of the protective box via a connector.

[0020] Furthermore, the protective box is equipped with an exhaust valve.

[0021] According to a specific embodiment of this application, this application provides a method for measuring the rupture pressure of high-pressure gas, the measurement method comprising:

[0022] The diaphragm to be tested is installed in the diaphragm clamping system, and the outlet of the gas compression chamber is sealed.

[0023] Gas at a predetermined pressure is injected into the gas compression chamber through the gas injection system;

[0024] The piston is pushed by the pressure generating system to compress the gas in the gas compression chamber until the diaphragm under test ruptures.

[0025] The pressure-time data during the rupture process of the diaphragm under test are recorded using a pressure measurement system.

[0026] The data was processed using a sliding window averaging algorithm to determine the membrane rupture pressure value.

[0027] Furthermore, the step of processing the data using a sliding window averaging algorithm to determine the membrane rupture pressure value includes:

[0028] Set the window length;

[0029] By iterating through the pressure-time series data, the arithmetic mean of data windows of continuous length is calculated to obtain a smoothed pressure value series.

[0030] The maximum value in the smoothed pressure value sequence is determined as the membrane rupture pressure.

[0031] Compared with the prior art, the above-described solutions of this application have at least the following beneficial effects:

[0032] 1. This application discloses a measuring device and method for measuring the rupture pressure of high-pressure gas membranes. A movable piston pressurizes a gas compression chamber sealed by a diaphragm under test. The gas compression chamber is connected to a pressure signal acquisition and recording system. As the movable piston gradually compresses the volume of the gas compression chamber, the pressure inside the chamber gradually increases until it reaches the ultimate pressure that the diaphragm under test can withstand. At this point, the piston is stopped, and the compressed gas is rapidly released through the rupture opening, causing the pressure to drop rapidly. The maximum pressure value recorded by the pressure measurement system in the gas compression chamber is the rupture pressure of the diaphragm under test. This measuring device and method have advantages such as simplicity, speed, efficiency, high safety, and the ability to be measured in a conventional laboratory.

[0033] 2. The measuring device and method for measuring the pressure of high-pressure gas rupture membrane in this application use compressed gas such as nitrogen or air instead of water or oil. The gas expands and is released rapidly at the moment of membrane rupture, with no risk of liquid splashing, no risk of combustion or explosion, and is inherently very safe.

[0034] 3. The present application provides a measuring device and method for measuring the rupture pressure of high-pressure gas. The pressure sensor directly and in real time monitors the pressure, and the sliding window averaging algorithm effectively smooths the random oscillation of the pressure curve, accurately and objectively extracting the pressure peak as the rupture pressure, avoiding errors and interference from human interpretation.

[0035] 4. This application discloses a measuring device and method for measuring the membrane rupture pressure of high-pressure gas. The measuring device is an independent and complete testing platform that does not rely on any specific large equipment such as a gas cannon. It can perform rapid and batch sampling tests on membranes of different batches and specifications anytime and anywhere. Moreover, the entire device has a compact structure, reduced thrust requirements, controllable costs, and is easy to operate in a conventional laboratory. Attached Figure Description

[0036] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0037] Figure 1 A schematic diagram of a measuring device for measuring the pressure of high-pressure gas membrane rupture, provided in an embodiment of the present invention;

[0038] Figure 2 A schematic flowchart of a method for measuring the rupture pressure of high-pressure gas, provided in an embodiment of the present invention;

[0039] Figure 3This is a schematic diagram of the sliding window averaging algorithm in a method for measuring the rupture pressure of high-pressure gas, provided in an embodiment of the present invention. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the article or device that includes said element.

[0042] The following is in conjunction with the appendix Figure 1-3 Detailed description of optional embodiments of the present invention.

[0043] like Figure 1 As shown in the figure, according to a specific embodiment of the present invention, the present invention provides a measuring device for high-pressure gas rupture pressure, comprising: a pressure generating system 1, a gas compression system 2, a gas injection system 3, a pressure measuring system, and a diaphragm clamping system 5.

[0044] In the technical solution of this application embodiment, the pressure generating system 1 includes a hydraulic pump station 1.2 and a high-pressure hydraulic hose connected thereto, i.e., a hydraulic oil pipeline 1.1. The hydraulic oil pipeline 1.1 is connected to the hydraulic chamber 2.2 of the gas compression system 2. The hydraulic pump station 1.2 serves as a power source, driving the piston 2.1 to move by pumping in hydraulic oil.

[0045] The gas compression system 2 includes a chamber and a piston 2.1. The piston 2.1 divides the interior of the chamber into two non-communicating spaces: a hydraulic chamber 2.2 and a gas compression chamber 2.3. Multiple O-rings are installed on the piston 2.1 to ensure a reliable seal between the two chambers. The piston 2.1 divides the chamber into two spaces, the hydraulic chamber 2.2 and the gas compression chamber 2.3, which can move left and right. The left side of the piston 2.1 is the hydraulic chamber 2.2, and the right side is the gas compression chamber 2.3. When the hydraulic pump station 1.2 pumps hydraulic oil into the hydraulic chamber 2.2 through hydraulic lines, the piston 2.1 moves to the right under the pressure of the hydraulic oil, compressing the space in the gas compression chamber 2.3 on the right side of the piston 2.1, and the gas pressure gradually increases.

[0046] The gas injection system 3 includes a gas source, connecting pipeline, control valve 3.1, and a double-threaded hydraulic hose connector. The gas source can be compressed air or compressed nitrogen. Since it does not involve flammable gases and requires no ignition system, the laboratory does not need explosion-proof modifications, making it safe and easy to operate. In this embodiment, the gas source is a high-pressure nitrogen cylinder. One end of the connecting pipeline is connected to the outlet of the high-pressure nitrogen cylinder via a quick-connect fitting, and the other end is connected to the inlet of the gas compression chamber 2.3 via a double-threaded hydraulic hose connector. The gas injection system 3 pre-injects gas at a certain pressure into the gas compression chamber 2.3 through the control valve 3.1. This pre-injection facilitates achieving higher gas pressure with less piston 2.1 displacement.

[0047] The pressure measurement system includes a high-frequency response pressure sensor 4.1 and a data processing unit 4.2. In this embodiment, the data processing unit 4.2 includes a data acquisition card and a computer with dedicated data processing software. The pressure sensor 4.1 is directly mounted on the wall of the gas compression chamber 2.3 via a threaded interface for real-time monitoring of the gas pressure within the chamber. The pressure sensor 4.1 is connected to the data acquisition card and the computer via a data cable. The system measures the gas pressure in the gas compression chamber 2.3 in real time and saves the pressure values ​​to the computer. By using a sliding window algorithm and setting a certain window width, the window length covers the local oscillation period while avoiding excessive smoothing of the key trend of the curve due to an excessively large window length. The maximum pressure value is calculated, which is the rupture pressure of the diaphragm under test. By smoothing the original pressure-time series data using a sliding window averaging algorithm, interference can be effectively filtered out and pressure peaks can be accurately extracted, thereby solving the measurement accuracy problem in the prior art and achieving accurate determination of the rupture pressure value.

[0048] The diaphragm clamping system 5, located at the outlet of the gas compression chamber 2.3 (i.e., at the inlet of the protective chamber 6), includes a pair of clamping rings with central openings and a seal. The thickness of the clamping rings should be no less than 8 mm to provide sufficient strength support and facilitate the installation of the seal. The outer diameter of the clamping rings is slightly smaller than the inner diameter at the inlet of the protective chamber 6 for installation purposes; generally, the outer diameter of the clamping rings should be 0.95 × the inner diameter at the inlet of the protective chamber 6. The inner diameter of the clamping rings is determined according to the size of the diaphragm to be tested or designed according to the test requirements. In this embodiment, the inner diameter of the clamping rings is 0.7 × the outer diameter of the diaphragm to be tested. In this embodiment, the seal is an O-ring rubber seal or a copper gasket. The diaphragm to be tested is clamped between the pair of clamping rings, and a seal is provided on the contact surface between the clamping rings and the diaphragm to be tested to achieve initial sealing of the diaphragm edge. The outlet flange of the gas compression chamber 2.3 is bolted to the diaphragm clamping system 5 for a sealed connection, forming a pressurized, enclosed space between the gas compression chamber 2.3, the diaphragm clamping system 5, and the external environment. The seals achieve a seal on the edge of the diaphragm under test. The seals on the clamping ring are primarily for sealing the diaphragm edge, preventing gas leakage between the diaphragm and the clamping ring. The outlet end of the gas compression chamber 2.3 and the diaphragm clamping system 5 are typically sealed via a flange connection or bolted sealing, which seals the mechanical interface between them. This seal is between one flange face and another, or a similar structure such as bolted fastening, preventing gas leakage from this interface.

[0049] This application embodiment also provides a preferred technical solution, in which the measuring device further includes a protective box 6 for collecting debris generated when the diaphragm ruptures; the diaphragm clamping system 5 is installed at the inlet end of the protective box 6 via a connector. In this embodiment, the connector is a bolt. A waste gas discharge valve 6.1 is provided on the side of the protective box 6 for safely releasing high-pressure gas after the test.

[0050] This application also provides method embodiments that follow the above embodiments. The interpretation of the same names is the same as that of the above embodiments, and they have the same technical effects as those of the above embodiments. They will not be repeated here.

[0051] like Figure 2 As shown in the embodiment, this application also provides a method for measuring the rupture pressure of high-pressure gas. Based on the same name meaning, the interpretation is the same as that of the above embodiment, and it has the same technical effect as that of the above embodiment, so it will not be repeated here.

[0052] A method for measuring the rupture pressure of high-pressure gas, such as... Figure 2 As shown, it includes:

[0053] S1. Install the diaphragm to be tested into the diaphragm clamping system 5 and seal the outlet of the gas compression chamber 2.3.

[0054] The diaphragm to be tested is installed between the two clamping rings of the diaphragm clamping system 5, and the clamping bolts are tightened to ensure that the seal is compressed. Then, the assembled diaphragm clamping system 5 is sealed and fixed between the outlet of the gas compression chamber 2.3 and the inlet of the protection box 6 through the connecting flange.

[0055] S2. Gas at a predetermined pressure is injected into the gas compression chamber 2.3 through the gas injection system 3.

[0056] Open the control valve 3.1 of the gas injection system 3, and inject nitrogen gas at a predetermined pressure, for example, 1 MPa, into the gas compression chamber 2.3 through the gas injection system 3. During this process, the pressure generating system 1 does not provide propulsion pressure, so that the hydraulic oil line 1.1 is in a return oil state, that is, the return oil line is opened, and the piston 2.1 moves under the push of the injected gas.

[0057] S3. The piston 2.1 is pushed by the pressure generation system 1 to compress the gas in the gas compression chamber 2.3 until the diaphragm under test ruptures.

[0058] High-pressure hydraulic oil is injected into the hydraulic oil line 1.1 through the pressure generation system 1, that is, the return oil line is closed and pressurized, pushing the piston 2.1 to compress the gas in the gas compression chamber 2.3 until the diaphragm under test ruptures.

[0059] S4. Record the pressure-time data during the rupture process of the diaphragm under test using a pressure measurement system.

[0060] S5. Process the data using the sliding window averaging algorithm to determine the membrane rupture pressure value. A flowchart of the sliding window averaging algorithm is shown below. Figure 3 As shown.

[0061] Algorithm starts.

[0062] Analyze the oscillation characteristics of the pressure curve and set a fixed window length k. This ensures that the window length k covers the local oscillation cycle, while avoiding excessive smoothing of the key trend of the curve due to an excessively large k. For example, if the curve completes a small oscillation every 5 data points, then k is set to 5-7 to ensure that the smoothing effect can offset the oscillation while avoiding over-smoothing.

[0063] Load the pressure-time series data P = [p1, p2, ..., pn] acquired by the pressure measurement system, and confirm the length n of the data series.

[0064] Initialize the auxiliary variables required by the algorithm. Define a left pointer left = 0, a right pointer right = k-1, initialize an empty smooth value array S, and set the maximum pressure value max_pressure = 0.

[0065] Check if the right pointer has reached the end of the data.

[0066] If the window does not exceed the bounds, extract the data [p_left,...,p_right] within the current window and calculate its arithmetic mean s.

[0067] The calculated average value s is stored in the smoothed value array S. Then, the window is slid to the right by one data point, that is, the left and right sides are each incremented by 1. This loop is repeated until all data has been processed.

[0068] After obtaining the complete array of smoothed values ​​S, iterate through the array, compare each smoothed value s_i with the current recorded max_pressure, and update the maximum value.

[0069] Check if the final obtained max_pressure is within a reasonable pressure range. If the result is unreasonable, for example due to an improperly set k value, return to readjust the window length k and recalculate; if the result is reasonable, the algorithm ends and outputs the maximum value as the membrane rupture pressure value measured this time.

[0070] Open the exhaust valve 6.1 on the protective box 6 to release the residual gas. After the pressure returns to normal, disassemble the device and clean it. Repeat the above steps to conduct multiple tests, and take the arithmetic mean of the membrane rupture pressure values ​​measured multiple times as the final membrane rupture pressure of this batch of membranes.

[0071] This application pressurizes the diaphragm under test by using a pressure generating system 1 to drive a piston 2.1 to compress the gas in the gas compression chamber 2.3, and then uses a pressure measurement system combined with a sliding window averaging algorithm to accurately obtain the diaphragm rupture pressure value. Compared with traditional water pressure and oil pressure methods, this application uses gas as the rupture medium. Its excellent compressibility makes the thrust required by the pressure generating system 1 and the overall device structure simpler and lighter. At the same time, the gas expands and releases rapidly after the diaphragm ruptures, which is easier to protect against than high-pressure liquids with impact, significantly improving operational safety. In addition, compared with the gas rupture method, the compressed nitrogen or air used in the gas injection system 3 of this application completely avoids the risks brought by combustibles and ignition systems, making the entire device compact, inherently safe, and easy to deploy and repeat in a conventional laboratory. Combined with the sliding window averaging algorithm used in the pressure measurement system to smooth the oscillating pressure data, this application has achieved significant progress in terms of device simplicity, operational safety, and measurement accuracy.

[0072] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems or apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and relevant parts can be referred to the method section.

[0073] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A measuring device for the high-pressure gas membrane rupture pressure, characterized in that The measurement device comprises: a pressure generating system for providing controllable propelling pressure; a gas compression system for compressing gas; a chamber and a piston; the piston divides the interior of the chamber into a hydraulic chamber and a gas compression chamber that are not connected to each other; a gas injection system for pre-filling gas into the gas compression chamber to increase the initial pressure; a pressure measuring system for monitoring and recording pressure data in the gas compression chamber, and determining the membrane rupture pressure value according to the pressure data; the pressure measuring system comprises a pressure sensor arranged on the gas compression chamber and a data processing unit for data acquisition and processing; a membrane clamping system for fixing and sealing the membrane to be measured; the pressure generating system drives the piston to move to compress the gas in the gas compression chamber; the gas pressure in the gas compression chamber is used to make the membrane to be measured rupture to obtain the membrane rupture pressure of the membrane to be measured.

2. The measurement device according to claim 1, wherein the data processing unit uses a sliding window average algorithm to smooth the pressure-time sequence data collected by the pressure sensor, and determines the maximum value in the smoothed data sequence as the membrane rupture pressure of the membrane to be measured.

3. The measuring device of claim 1, wherein, The pressure generating system comprises a hydraulic pump station and a hydraulic oil pipeline; the hydraulic pipeline is connected with the hydraulic chamber to drive the piston to move.

4. The measuring device of claim 1, wherein, The gas injection system comprises a gas source, a connecting pipeline and a control valve; the gas source is a high-pressure nitrogen cylinder or a compressed air source; the connecting pipeline is connected with the gas compression chamber.

5. The measuring device of claim 1, wherein, The membrane clamping system is arranged at the outlet of the gas compression chamber and comprises a pair of center-opening clamping rings and a sealing element; the membrane to be measured is clamped between the pair of clamping rings, and the sealing element is arranged on the contact surface between the clamping ring and the membrane to be measured.

6. The measuring device of claim 5, wherein, The outlet of the gas compression chamber is sealingly connected with the membrane clamping system to form a closed space between the gas compression chamber, the membrane clamping system and the external environment.

7. The measuring device of claim 1, wherein, The measurement device further comprises a protection box for collecting debris generated when the membrane ruptures; the membrane clamping system is installed at the inlet end of the protection box through a connecting piece.

8. The measuring device of claim 7, wherein, The protection box is provided with a waste gas discharge valve.

9. A method for measuring the membrane rupture pressure of a high-pressure gas based on the measuring device according to any one of claims 1 to 8, characterized in that The measurement method comprises: installing the membrane to be measured on the membrane clamping system and sealing the outlet of the gas compression chamber; injecting a gas with a predetermined pressure into the interior of the gas compression chamber through the gas injection system; driving the piston by the pressure generating system to compress the gas in the gas compression chamber until the membrane to be measured ruptures; recording the pressure-time data during the rupture process of the membrane to be measured by the pressure measuring system; processing the data using a sliding window average algorithm to determine the membrane rupture pressure value.

10. The measurement method according to claim 9, characterized by, The processing of the data using the sliding window average algorithm to determine the membrane rupture pressure value comprises: setting a window length; traversing the pressure-time sequence data to calculate the arithmetic mean value of the data window with a continuous length to obtain a smoothed pressure value sequence; determining the maximum value in the smoothed pressure value sequence as the membrane rupture pressure.

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