Testing device for testing wave absorbing performance of explosion-proof valve

Abstract

A testing device for testing the wave absorbing performance of an anti-explosion valve comprises a reverse heavy frame, a reverse heavy frame and a testing device, wherein the reverse heavy frame is provided with a mounting interface; the mounting panel is arranged on the mounting interface and is fixedly arranged relative to the reverse heavy frame, a mounting opening is formed in the mounting panel, and a mounting structure for mounting a sample is arranged on the mounting opening; the mounting structure is designed according to the contour shape, size or mounting requirement of the sample so as to meet the fixed arrangement of different samples on the mounting panel. In the invention, the mounting structure is designed according to different samples and can be used for mounting different types of sample pieces or existing contrast samples and the like, so that a contrast test is realized, that is, the samples and the contrast samples are simultaneously tested in one test process, and the test efficiency is greatly improved while the performance parameters of each sample and the contrast sample are obtained. And the parameters can be compared, so that a reliable theoretical basis is provided for the improved design of the sample.

Description

Technical Field

[0001] The present invention relates to the technical field related to performance testing of protective equipment, and more specifically, to a test device for testing the wave-absorbing performance of explosion-proof wave valves. Background Art

[0002] The explosion-proof valve is a protective device installed at the air inlet and exhaust vents and smoke outlets of the project. It can close automatically and quickly under the action of the shock wave overpressure, and can automatically reset after the shock wave. After the explosion-proof valve is closed, most of the shock wave will be blocked outside the project. At the moment the valve is closed, a small part of the shock wave will enter the diffusion chamber and weaken to the allowable pressure after diffusion. The purpose of setting up the explosion-proof valve is to protect the personnel and technical equipment in the civil air defense project or facilities from damage by shock waves. Usually, multiple explosion-proof valves are installed in parallel at the ventilation inlet or exhaust vents on the facade of the building.

[0003] The explosion-proof valves commonly used in civil air defense projects are mainly swing-type explosion-proof valves and hose-type explosion-proof valves. Due to the characteristics of the structural mechanism, these two valves can only realize their protection function when they are positively subjected to shock wave loads. Therefore, in order to prevent shock waves from entering from the side, the valves need to be set inside the channel or embedded in the wall for a certain distance. In the "RFJ04-2009 Test and Quality Inspection Standard for Civil Air Defense Engineering Protection Equipment", Article 5.1.1 stipulates that the developed valve wave-absorbing system should be tested for wave-absorbing performance before finalization; Article 5.1.4 stipulates that under the action of nuclear explosion shock wave, the valve wave-absorbing performance test should adopt the shock tube test method. When the shock tube test method cannot meet the requirements, the explosion test method in the tunnel or pipeline can be adopted. Under the action of chemical explosion shock wave, the valve wave-absorbing performance test should adopt the explosion test method in the tunnel or pipeline; Article 5.2.2 stipulates that when the shock tube test method is adopted, the valve wave-absorbing performance test device is mainly composed of a shock tube, a transition section, a voltage stabilizing section and a test section. When the explosion test method in the tunnel or pipeline is adopted, the shock tube is replaced by a charging section.

[0004] At present, the research on valves is mainly based on experiments. Commonly used test methods include shock tube simulation tests and on-site nuclear explosion tests. The shock tube test is to reduce the model according to the explosion similarity to obtain the test results. The working performance of valves under the shock wave of nuclear explosions is currently mostly carried out in this way. However, there are certain differences between the experimental results obtained by testing with models and the actual parameters of the molded products. In addition, the existing tests are all conducted on a certain sample to obtain parameters, which cannot be compared with parallel products. Summary of the invention

[0005] 1. Technical issues

[0006] In summary, for the newly developed explosion-proof wave valve, it is of great significance to invent a test device for the wave-absorbing performance of the explosion-proof wave valve and to study its wave-absorbing performance detection method.

[0007] (II) Technical solution

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] The present invention provides a test device for testing the wave-absorbing performance of an explosion-proof valve. In the present invention, the test device for testing the wave-absorbing performance of an explosion-proof valve is used in conjunction with an impact tube, and comprises:

[0010] A reverse bearing frame fixedly mounted relative to the impact tube, wherein a mounting interface is provided on the reverse bearing frame;

[0011] A mounting panel (1) is arranged on the mounting interface and fixedly arranged relative to the reverse bearing frame, a mounting opening is arranged on the mounting panel, and a mounting structure (2) for mounting a sample is arranged on the mounting opening, wherein the mounting structure is designed according to the contour shape, size or installation requirements of the sample to meet the requirements of fixing different samples on the mounting panel.

[0012] Preferably, in the explosion-proof wave valve wave-absorbing performance test device provided by the present invention, it also includes a load-bearing frame (3), which can be fixedly arranged on the mounting interface and used for fixing and installing the mounting panel; the load-bearing frame is a rectangular frame structure, the front side surface of the load-bearing frame is provided with a front mounting plate, the rear side surface of the load-bearing frame is provided with a rear mounting plate, the mounting panel is arranged on the front side surface of the load-bearing frame, the outer contour of the mounting panel is used to abut against the front mounting plate and be fixedly connected by bolts, and the rear mounting plate at least includes a plate structure arranged upper and lower, which is used for being fixedly connected to the reverse load-bearing frame by bolts.

[0013] Preferably, in the explosion-proof wave valve wave-absorbing performance test device provided by the present invention, the mounting structure is a frame-type structure protruding forward relative to the front side of the mounting panel, and the internal space of the mounting structure is used for fixed connection with the outer frame of the sample and for realizing contactless installation of the valve core of the sample, and the internal space size of the mounting structure is not less than the outer contour size of the sample.

[0014] Preferably, in the explosion-proof wave valve wave-absorbing performance test device provided by the present invention, the installation port includes a sample installation port and a comparison installation port, the sample to be tested is set on the sample installation port through the installation structure, and the comparison sample for the test is set on the comparison installation port.

[0015] Preferably, in the explosion-proof wave valve wave-absorbing performance test device provided by the present invention, a first pressure sensor mounting hole is provided on the mounting panel, and a plurality of first pressure sensor mounting holes are provided and are arranged at equal intervals in the height direction.

[0016] Preferably, in the explosion-proof wave valve wave-absorbing performance test device provided by the present invention, an auxiliary plate is fixedly arranged relative to the mounting panel, the auxiliary plate is arranged parallel to the mounting panel, the auxiliary plate is arranged flush with the front end surface of the mounting structure, a second pressure sensor mounting hole is arranged on the auxiliary plate, and a plurality of the second pressure sensor mounting holes are arranged and spaced apart in the horizontal direction.

[0017] Preferably, in the explosion-proof wave valve wave-absorbing performance test device provided by the present invention, a diffusion box (4) is arranged on the back side of the installation panel corresponding to the installation port, one end of the diffusion box covers the corresponding installation port and is fixedly connected to the installation panel, and the other end of the diffusion box is provided with an air hole.

[0018] Preferably, in the explosion-proof wave valve wave-absorbing performance test device provided by the present invention, a third pressure sensor mounting hole is provided on the diffusion box, and a plurality of the third pressure sensor mounting holes are provided and are evenly spaced along the depth direction of the diffusion box.

[0019] Preferably, in the explosion-proof wave valve wave-absorbing performance test device provided by the present invention, a fourth pressure sensor mounting hole is provided on the diffusion box, and the fourth pressure sensor mounting hole is provided on both sides of the diffusion box and is located in the same vertical plane as the first third pressure sensor mounting hole.

[0020] Preferably, in the explosion-proof wave valve wave-absorbing performance test device provided by the present invention, a pressure sensor is arranged in each pressure sensor mounting hole, and the pressure sensor is connected to an external signal processing device through a data line, and the data line is routed from the back of the mounting panel.

[0021] (III) Beneficial effects

[0022] As can be seen from the above, the present invention provides a test device for testing the wave-absorbing performance of explosion-proof valves, which is used in conjunction with an impact tube, and includes: a reverse bearing frame fixedly installed relative to the impact tube, on which a mounting interface is arranged; a mounting panel arranged on the mounting interface and fixedly arranged relative to the reverse bearing frame, on which a mounting port is arranged, and on which a mounting structure for installing a sample is arranged, and the mounting structure is designed according to the contour shape, size or installation requirements of the sample to meet the fixed arrangement of different samples on the mounting panel. Through the above structural design, the test device for testing the wave-absorbing performance of explosion-proof valves provided by the present invention is provided with a mounting structure, and the mounting structure is designed according to different samples, and can be installed on different types of samples or ready-made comparison samples, so as to realize comparison tests, that is, the sample and the comparison sample are tested simultaneously during one test process, and while obtaining the performance parameters of each sample and the comparison sample, these parameters can also be compared, providing a reliable theoretical basis for improving the design of the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0024] Figure 1 It is a structural schematic diagram of a test device for testing the wave-absorbing performance of explosion-proof valves in an embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the side cross-sectional structure of the test device for the wave-absorbing performance test of the explosion-proof wave valve in the embodiment of the present invention;

[0026] Figure 3 It is a structural schematic diagram of a diffusion box in an embodiment of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the installation structure in an embodiment of the present invention.

[0028] exist Figure 1 and Figure 2 The reverse bearing frame is not shown in FIG. Figure 4 The pressure sensor is not shown.

[0029] exist Figures 1 to 4 In the figure, the corresponding relationship between the component names and the reference numerals is as follows:

[0030] Installation panel 1, installation structure 2, load-bearing frame 3, diffusion box 4. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention encompasses such modifications and variations within the scope of the appended claims and their equivalents.

[0032] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] Please refer to Figures 1 to 4 ,in, Figure 1 It is a structural schematic diagram of a test device for testing the wave-absorbing performance of explosion-proof valves in an embodiment of the present invention; Figure 2 It is a schematic diagram of the side cross-sectional structure of the test device for the wave-absorbing performance test of the explosion-proof wave valve in the embodiment of the present invention; Figure 3 It is a structural schematic diagram of a diffusion box in an embodiment of the present invention; Figure 4 It is a structural schematic diagram of the installation structure in an embodiment of the present invention.

[0034] The invention provides a test device for testing the wave-absorbing performance of an explosion-proof wave valve. The test device for testing the wave-absorbing performance of an explosion-proof wave valve is used in conjunction with an impact tube and can perform performance tests on newly developed explosion-proof wave valves.

[0035] When the performance test device for the explosion-proof valve wave-absorbing performance test provided by the present invention is used for performance testing, the shock tube used is the existing shock tube, and the present invention does not improve its (shock tube) structure and use method. In the present invention, the explosion-proof valve wave-absorbing performance test device includes: a reverse bearing frame fixedly installed relative to the shock tube, and a mounting interface is arranged on the reverse bearing frame; and a mounting panel 1 arranged on the mounting interface and fixedly arranged relative to the reverse bearing frame, and a mounting port is arranged on the mounting panel 1, and a mounting structure 2 for installing the sample is arranged on the mounting port, and the mounting structure 2 is designed according to the contour shape, size or installation requirements of the sample to meet the fixed setting of different samples on the mounting panel 1. It can be seen from the existing shock tube structure that the shock tube includes a shock tube, a transition section, a voltage stabilizing section and a test section, and an impact port structure is arranged at the end of the test section, and the reverse bearing frame is arranged opposite to the impact port structure. The reverse bearing frame needs to be fixedly installed, and the reverse bearing frame can be fixedly installed by pre-buried foundation or by setting a building wall on the opposite side of the impact port structure. The reverse bearing frame is made of metal profiles and is a rectangular frame structure as a whole. The reverse bearing frame is provided with a mounting interface for fixing and mounting the supporting frame 3 .

[0036] In the present invention, the load-bearing frame 3 is a transition member, which is used to fix the installation panel 1 to the reverse bearing frame. The installation panel 1 is set on the front side of the load-bearing frame 3. The outer contour of the installation panel 1 is used to abut against the front installation plate and is fixedly connected by bolts. The rear installation plate at least includes a plate structure arranged above and below, which is used to be fixedly connected to the reverse bearing frame by bolts. As a transition installation structure 2 for the installation panel 1 on the reverse bearing frame, the load-bearing frame 3 needs to have a high structural strength and adjustable capability. Specifically, the bearing frame 3 is made of steel profiles, preferably I-beams, and secondarily channel steels. The bearing frame 3 is designed according to the size of the mounting interface. The overall size of the bearing frame 3 is not less than the size of the mounting interface (i.e., the bearing frame 3 can completely cover the mounting interface). The bearing frame 3 is a rectangular frame structure (the mounting interface is a rectangular mouth structure). The front side surface (i.e., the wave-facing surface) of the bearing frame 3 is used to fix the mounting panel 1. In order to achieve a fixed connection with the mounting panel 1, a front mounting plate is provided on the front side surface of the bearing frame 3, and a plurality of hole structures are provided on the front mounting plate. Bolts are provided on the mounting panel 1, and the bolts are used to fix the mounting panel 1 on the bearing frame 3 through the hole structures. A rear mounting plate is provided on the rear side surface of the bearing frame 3, and a plurality of hole structures are provided on the rear mounting plate. Similarly, a plurality of hole structures are also provided on the reverse bearing frame. In this way, the holes correspond to each other and the bearing frame 3 can be fixed to the reverse bearing frame by providing a bolt assembly. In a specific embodiment of the present invention, the rear mounting plate includes an upper rear mounting plate and a lower rear mounting plate, the upper rear mounting plate is provided with a row of equally spaced hole structures, and the lower rear mounting plate is provided with a row of equally spaced hole structures, so that the load-bearing frame 3 can be fixedly installed on the reverse bearing frame through the upper and lower rows of bolt assemblies. Of course, both sides of the load-bearing frame 3 also need to be against the reverse bearing frame to ensure the firmness and reliability of the installation of the load-bearing frame 3 on the reverse bearing frame.

[0037] The mounting panel 1 is a flat metal sheet. A mounting port is provided on the mounting panel 1. The mounting port is a rectangular port structure. There are multiple mounting ports, which are arranged at intervals from top to bottom. A mounting structure 2 is provided on the front side (wave-facing surface) of the mounting panel 1 by flange docking. The mounting structure 2 is an integrated metal component. The mounting structure 2 is a customized part. Its structural dimensions are not fixed, but customized according to the sample for each test. The mounting structure 2 is a frame-type structure protruding forward relative to the front side of the mounting panel 1. The internal space of the mounting structure 2 is used to be fixedly connected with the outer frame of the sample and to achieve contactless installation of the valve core of the sample. The internal space size of the mounting structure 2 is not less than the outer contour size of the sample. The two ends of the mounting structure 2 are open opening structures. One end of the mounting structure 2 is provided with a flange edge, which is corresponding to the mounting port and abuts against the mounting panel 1 and is installed by a bolt assembly. Generally, the sample is a component, that is, a valve structure installed on a closed protective door. Its overall design is usually a rectangular parallelepiped shape. At the same time, the sample has an outer frame, a valve body is fixedly arranged in the outer frame, and a valve core is arranged in the valve body. When designing the mounting structure 2, the present invention adopts the following design criteria: taking the ability to completely mount a sample as the standard, and at the same time, the inner side structure design of the mounting structure 2 is based on the outer frame that can stably mount the sample. In this way, after the sample is installed in the mounting structure 2, the valve body and the valve core do not contact the mounting structure 2. Without being affected by the mounting structure 2, the test can be better carried out to obtain a more reliable test result.

[0038] In order to achieve comparative testing of samples during the test process, that is, to test newly developed product samples and existing products at the same time, the present invention optimizes the structure of the installation port: the installation port includes a sample installation port and a comparison installation port, the sample to be tested is set on the sample installation port through the installation structure 2, and the comparison sample for the test is set on the comparison installation port. The present invention can install different samples or existing finished products on different installation ports, so that all test pieces can obtain the same impact in one test.

[0039] The parameters obtained by the present invention during the test process are pressure parameters, which can be obtained through pressure sensors. For the setting of the pressure sensor, the present invention adopts the following scheme: 1. A first pressure sensor mounting hole is set on the mounting panel 1, and a plurality of first pressure sensor mounting holes are set and are evenly spaced in the height direction; 2. An auxiliary plate is fixedly set relative to the mounting panel 1, and the auxiliary plate is set parallel to the mounting panel 1, and the auxiliary plate is set flush with the front end surface of the mounting structure 2, and a second pressure sensor mounting hole is set on the auxiliary plate, and a plurality of second pressure sensor mounting holes are set and are spaced in the horizontal direction; 3. A diffusion box 4 is set on the back of the mounting panel 1 corresponding to the mounting port, and one end of the diffusion box 4 covers the mounting port corresponding to it and is fixedly connected to the mounting panel 1, and the other end of the diffusion box 4 is provided with air holes; 4 1. A third pressure sensor mounting hole is provided on the diffusion box 4. There are a plurality of third pressure sensor mounting holes and they are evenly spaced along the depth direction of the diffusion box 4. Further, the third pressure sensor mounting hole is provided on the upper side of the diffusion box 4 (there are three third pressure sensor mounting holes, which are respectively provided at one-quarter of the depth, one-half of the depth and three-quarters of the depth. Of course, a third pressure sensor mounting hole can also be provided at each end of the diffusion box 4 in the depth direction); 5. A fourth pressure sensor mounting hole is provided on the diffusion box 4. The fourth pressure sensor mounting hole is provided on both sides of the diffusion box 4 and is located in the same vertical plane as the first third pressure sensor mounting hole. The present invention provides a pressure sensor in each pressure sensor mounting hole. The pressure sensor is connected to an external signal processing device through a data cable, and the data cable is routed from the back of the mounting panel 1.

[0040] The shock tube is a common device for generating and simulating shock waves. The shock tube includes high-pressure and low-pressure parts, usually called the driver and the driven part, which are separated by a diaphragm (the diaphragm explodes to generate shock waves). The pressure wave is generated by the sudden explosion of the latter. During the test, all test fixtures (mounting panel 1 and other structures for mounting samples) and samples are installed on the reverse bearing frame of the shock tube. The test fixture is designed according to the reserved mounting interface and size of the reverse bearing frame. The test fixture mainly includes the following structures: 1. The load-bearing frame 3 matches the reserved interface of the reverse bearing frame; 2. The mounting panel 1 includes the mounting structure 2 for the test sample (sample) (the mounting structure 2 refers to the existing structure of the test sample, which is used to fix the test sample to the mounting panel 1) and the mounting structure 2 for ensuring the installation of the pendulum valve wave-absorbing unit; 3. The diffusion box 4 and the mounting interface between the diffusion box 4 and the mounting panel 1 ensure that the outlet pressure of each test sample can be measured separately; 4. The sensor mounting interface required for each measuring point; 5. The panel hole blocking structure after the sample is disassembled according to the test plan.

[0041] To facilitate the comparison of performance parameters, the valves to be tested (including the samples to be tested for performance and the comparison test samples for comparison) are installed on the same fixture, and the test fixture is installed on the reaction support frame of the shock tube by designing the fixture interface size. To facilitate the measurement of the residual pressure at the back wavefront outlet of each sample, a diffusion box 4 is installed at the corresponding position of each sample to prevent the test results of other samples from being affected when a large residual pressure leak occurs in a sample.

[0042] The mounting structure 2 for mounting the sample on the test fixture is designed to prevent the sample from affecting other samples due to splashing or other factors after obvious structural damage occurs under the action of the shock wave, and to constrain possible damage within a corresponding range. There is no connection between the sample mounting structure 2 and the test piece (no connection here means that the mounting structure 2 has no contact with the valve body and the valve core), which does not affect the load boundary conditions under its design conditions. Through the above design, each sample is placed under the same shock wave, which is convenient for comparing the performance parameters of each sample. At the same time, by installing a diffusion box 4 on the back of the sample, it is ensured that the leakage pressure of each sample does not affect each other. After the sample is installed, the test device is used to obtain shock waves with different reflection peaks and action times on the wavefront of the sample. The key performance parameters of each valve can be obtained through the data measured by the sensor.

[0043] In order to verify the wave-absorbing performance and bearing capacity of the developed samples, the resistance performance of the trial-produced samples was tested for the civil air defense equipment. The test object is the valve unit (including the outer frame, valve body and valve core, etc.), which is installed vertically. According to the index requirements, the assembled two-way wave-absorbing and explosion-proof valve must meet the following requirements: For valves with a resistance level of 5, the structure will not be damaged after the reflected overpressure peak is not less than 0.3MPa and the positive pressure action time is not less than 500ms after the simulated nuclear explosion shock wave, the valve can be automatically reset and the valve wave-absorbing rate is not less than 75%.

[0044] The following purposes can be achieved through the test device for the wave-absorbing performance of explosion-proof wave valves: 1) to test the results of numerical simulation calculations; 2) to verify the wave-absorbing performance of the valves, and to measure key parameters such as the residual pressure behind the valves, the wave-absorbing rate, and the valve closing time; 3) to test the structural strength of each component of the valve; 4) to compare the wave-absorbing performance of assembled two-way wave-absorbing explosion-proof wave valves and suspended swing-type explosion-proof wave valves; 5) to provide a basis for the final design of the valves.

[0045] The present invention reserves sensor installation threaded interfaces at the installation panel 1, the diffusion box 4 and the test sample design test points, which are designed according to M20, and the final thread specifications need to be confirmed according to the test requirements. Before the test, the load-bearing frame 3 and the reverse load-bearing frame must be installed before the remaining structures are installed, otherwise the bolt connection will be difficult to operate. The sample installation structure 2 is a force-bearing structure for realizing the trial sample under normal use, ensuring that the sample installation structure 2 is consistent with the design requirements. During installation, the sample installation structure 2 and the diffusion box 4 can be installed with the installation panel 1, and then installed with the load-bearing frame 3, and finally the test sample is installed.

[0046] The test device for the wave-breaking performance of explosion-proof valves provided by the present invention solves the problem of testing the wave-breaking performance of new valves before they are developed and finalized. By testing the stress of explosion-proof valves when they are subjected to shock wave loads, targeted technical improvements can be made. In addition, the present invention can conduct comparative tests, that is, the sample and the comparative parts are installed on the same test fixture, and the test parameters are obtained under the same test process for comparison. The wave-breaking performance technical parameters of the new explosion-proof valve and the pendulum explosion-proof valve can be significantly compared, providing useful ideas for product optimization and improvement.

[0047] To facilitate the comparison of performance parameters, the valve to be tested and the comparison valve (when a comparison valve is provided, the valves used for testing are valves provided on the valve, and the present invention is a component unit) are installed on the same tooling, and the test tooling is installed on the reaction force support frame of the shock tube by designing the tooling interface dimensions. To facilitate the measurement of the residual pressure at the back wavefront outlet of each sample, a diffusion box 4 is installed at the corresponding position of each sample to prevent the test results of other samples from being affected when a large residual pressure leak occurs in a sample.

[0048] The present invention can obtain the following data through experiments, and analyze and calculate the key wave-absorbing technical parameters of the valve.

[0049] ①. Under the action of a simulated nuclear explosion shock wave with a reflected overpressure peak of not less than 0.3MPa and a positive pressure action time of not less than 500ms, the pressure curve of the wavefront and the outlet pressure curve of the back wavefront of each valve were measured, and the wave elimination rate of each valve was obtained after analysis and calculation;

[0050] ②. Obtain the residual pressure at different positions of the diffusion box;

[0051] ③. Structural bearing capacity and design margin of trial-produced valve.

[0052] The specific design and operation steps of the valve performance test of the present invention are as follows:

[0053] 1. Design of layout of pressure measuring points.

[0054] In order to measure the pressure curve of the shock wave reaching the wavefront of the test fixture after being reflected by the shock tube, 8 pressure measuring points are set on the wavefront of the test fixture, and the arrangement of the measuring points is shown in the attached figure. Among them, FS-P1, FS-P2, FS-P3, and FS-P4 are located on the same vertical line. FS-P3, FS-P3-L, and FS-P3-R are located on the same horizontal line. FS-P4, FS-P4-L, and FS-P4-R are located on the same horizontal line. Through the arrangement of the above measuring points, the pressure distribution of the shock wave to the wavefront of the fixture can be measured, so that the reflected pressure of each valve can be calculated as accurately as possible.

[0055] At the same time, because the installed valve protrudes from the wavefront surface of the tooling, there is a difference between the pressure reaching the wavefront surface of the valve and the pressure reaching the wavefront surface of the tooling. In the arrangement of the measuring points, the installation plane of the FS-P3 and FS-P4 sensors is at the same height as the wavefront surface of the valve, which is used as the reference value for calculating the reflected pressure of the corresponding valve.

[0056] In order to measure the pressure leakage of the valve under different shock waves, the pressure distribution in the valve diffusion box is measured to obtain the residual pressure distribution after the valve wave is eliminated. The arrangement of the measuring points is shown in the figure. Five sensors are installed on each diffusion box. Among them, YCi-1, YCi-2, and YCi-3 are located on the vertical plane of the center line of the diffusion box, equidistantly distributed, and are located at 1 / 4, 1 / 2, and 3 / 4 of the length of each diffusion chamber in the depth direction. Measuring points YCi-4 and YCi-5 are arranged on the side panels on both sides. Through the above arrangement, the shock wave reflection pressure on the wavefront of each valve and the residual pressure of the valve after wave elimination can be measured. The sensor data connection is wired from the back side of the device.

[0057] 2. Experimental process

[0058] In order to obtain the desired shock wave pressure curve, by changing the initial pressure of the explosion chamber, the charge position, charge amount and detonation method, the peak values ​​of the shock wave reflection pressure acting on the valve are respectively 0.3MPa and 0.6MPa, and the positive pressure action time of the shock wave is not less than 500ms. The test sequence table of this test is shown in Table 1.

[0059] Table 1 Test sequence

[0060]

[0061] Carry out chemical explosion tests according to the determined test sequence table and collect relevant test data.

[0062] 3. Evaluation of sample performance index test results.

[0063] As a key device of the wave dissipation system, the explosion-proof valve has the main function of weakening the shock wave to within the range allowed by the wave dissipation system when the shock wave comes. To achieve this function, it is necessary to first ensure that the valve has sufficient structural strength during the entire period of the shock wave to avoid structural damage that causes it to be unable to perform its wave dissipation function. Secondly, the valve has sufficient wave dissipation efficiency to prevent the peak part of the shock wave energy from entering the wave dissipation system, avoiding the protection project from bearing most of the shock wave energy and high residual pressure, causing damage to personnel and equipment. Finally, although the explosion-proof valve is designed as a one-time use device, if it can be reused multiple times within the designed shock wave pressure and action time, it can effectively improve the safety of personnel in the event of multiple attacks in a short period of time and greatly reduce the maintenance and use costs of the equipment.

[0064] In terms of resistance and bearing capacity, the main load of the newly developed valve sample is the impact force after the valve core collides with the valve body after being subjected to the shock wave. Compared with the impact force, the effective load of the shock wave on the equipment is relatively small. When selecting the structural form and optimizing the key parameters, ensuring the structural strength of the equipment is the primary consideration.

[0065] The load on the valve under the actual shock wave is determined by the waveform and duration of the shock wave. In this test, in addition to carefully verifying the corresponding design load of the valve, destructive tests were also carried out on two valve samples with a design load of 0.3MPa to verify whether they have sufficient design margins.

[0066] The evaluation of the equipment's load-bearing capacity after the test is carried out by analyzing the residual pressure waveform during the test and disassembling the sample after the test. The details are as follows.

[0067] A. Bearing performance under corresponding resistance.

[0068] Under working condition No. 1 (the working condition corresponding to shot sequence 1 in Table 1), the residual pressure curves of HK200 (5), ZPSXBM (5) and NPV-KK (5) are normal, the reset action is normal, and the structure is not damaged or deformed after disassembly. The designed samples can withstand the shock wave with a design load of 0.37MPa and an action time of less than 1710ms, and the wave absorption performance remains within a stable range.

[0069] B. Bearing performance under super design resistance.

[0070] Under condition 2 (the condition corresponding to shot sequence 2 in Table 1), the peak value of reflected overpressure is 0.42 MPa, and the shock wave duration is 1100 ms. The peak pressure exceeds the design value of HK200 (5), ZPSXBM (5), and NPV-KK (5) by 40%.

[0071] HK200 (5) (comparative sample) has partial debonding and tearing of the sealing strip, but the rest of the structure is normal. On the residual pressure curve, it can be observed that the seal is not tight due to debonding and tearing of the sealing strip, resulting in an abnormal pressure relief curve.

[0072] ZPSXBM (5) (sample) has one of the three airways with a valve core stuck in the closed position and cannot be reset normally, while the other valve cores work normally. After disassembling the sample, the stuck valve core can be restored to normal working state by external force knocking, and the operation is normal after restoration. After disassembly, does the valve core have obvious plastic deformation? The valve body structure is normal, with no obvious structural damage and deformation.

[0073] The three airway valve cores of NPV-KK (5) (another sample) were all stuck in the closed position and could not be reset normally. After the sample was disassembled, the stuck valve core was knocked by external force and restored to normal working state, and the operation was normal after restoration. After disassembly, the valve core and valve body structure were normal, without obvious structural damage and deformation.

[0074] It can be seen from the residual pressure curves of ZPSXBM (5) and NPV-KK (5) that the residual pressure will increase significantly in the case of plastic deformation and sticking of the valve core, but the difference with the curve under normal operation is small (increasing from 20KPa to 50KPa).

[0075] After the test of ZPSXBM(5), one of the three air passages had a stuck valve core, which could be restored to normal by external force tapping the valve core. During the sample disassembly process, it was found that the valve body had slight deformation, which made it difficult to replace the valve core through the normal design position. After disassembly, all three valve cores showed obvious plastic deformation. The size changes of the three valve cores were very small. The design value of the pipe diameter of one valve core was 38mm. After measurement, the maximum end diameter was 38.24mm and the minimum was 36.48mm. The sample installation plate showed obvious plastic deformation, with obvious warping and dents.

[0076] After the NPV-KK(5) test, the valve cores in the three airways were completely stuck and could be restored to normal by external force on the valve core. After the sample was disassembled, there was no obvious plastic deformation of the valve body and valve core, but the end limit structure of the guide device was obviously deformed, and the sample installation plate showed obvious plastic deformation.

[0077] In terms of wave absorbing performance, the wave absorbing characteristics of the valve for shock waves are mainly reflected in the wave absorbing rate under different waveforms, the residual pressure at the valve outlet and the reduction characteristics of the main wave peak. According to the characteristics of the shock wave waveform, the reduction characteristics of the valve for the main wave peak can be summarized and evaluated by the valve closing time. The closing time of the valve is determined by the shock wave input and the system structure parameters and quality parameters. When the shock wave waveform is given, it is completely determined by the system structure form and parameters. For the trial-produced valve samples, the pressure waveform of the shock wave reflected by the chemical explosion is difficult to control. At the same time, it is impossible to directly measure the closing time of the valve core through effective measurement means. For this reason, this project mainly indirectly infers the closing time of the valve core through the analysis of the valve residual pressure curve and the valve body acceleration curve. The final conclusions are shown in Table 2 and Table 3.

[0078] Table 2 Analysis of closing time of each valve under working condition 1

[0079]

[0080] Table 3 Analysis of closing time of each valve under working condition 2

[0081]

[0082] As for the wave-absorption rate, the damage effect of the shock wave on personnel and equipment mainly depends on the overpressure peak, the positive pressure action time and the specific impulse. In order to evaluate the wave-absorption performance of the trial-produced valve sample, the wave-absorption rate is calculated in three ways, namely, the pressure peak ratio method, the specific impulse ratio method and the energy ratio method.

[0083] 1) Peak pressure ratio method.

[0084] Take the maximum value of the reflected overpressure ΔP on the valve frontal wave surface c And the maximum residual pressure of the diffusion chamber ΔP y , calculate the peak wave elimination rate according to formula 1.

[0085]

[0086] It can be seen from the calculation relationship that this calculation method can only measure the effect of the wave-breaking equipment on reducing the pressure peak, and has nothing to do with the duration of the pressure and the waveform distribution. In actual use, because the reflected waveform is complex and changeable, and there is a significant difference from the theoretical pressure curve, the description of the actual wave-breaking effect is limited. For example, in the case of a long boost time and large oscillation of the main peak pressure, the valve cannot obtain sufficient closing pressure, resulting in a high system residual pressure and a low wave-breaking rate. Another corresponding situation is that the boost time is very short, and there is a secondary peak with a smaller pressure before the main peak, which just allows the valve to close in a very short time. The greater the main peak pressure, the higher the wave-breaking rate. The peak wave-breaking rates of each valve under different working conditions are shown in Table 4.

[0087] 2) Specific impulse ratio method.

[0088] The area enclosed by the overpressure-time relationship curve is the shock wave specific impulse, and its mathematical expression is shown in Formula 2. t1 and t2 are the start and end times of the shock wave positive pressure, respectively.

[0089]

[0090] The specific impulse elimination rate of the valve is calculated according to Formula 3. c is the specific impulse of the reflected overpressure on the frontal wave surface during the action time, I y It is the specific impulse during the duration of the residual pressure in the diffusion box at the valve outlet.

[0091]

[0092] The specific impulse calculation can take into account the influence of pressure and action time, and to a certain extent includes the characteristic information of the pressure waveform, which has a good evaluation effect on the wave absorbing performance of the equipment under the action of long-term shock waves. The specific impulse absorbing rate of each valve under different working conditions is shown in Table 5.

[0093] 3) Energy ratio method.

[0094] From the perspective of energy concept, according to Bashevar's law, the energy of the pressure curve in the time domain is equal to its energy in the frequency domain. After the recorded pressure curve is Fourier transformed to obtain its power, the energy is calculated in the frequency domain. The energy calculation of the pressure curve is shown in Equation 4.

[0095]

[0096] The specific impulse elimination rate of the valve is calculated according to Formula 5. c E is the energy reflected by the frontal wave surface during the overpressure action time, y It is the energy during the duration of the residual pressure in the diffusion box at the valve outlet.

[0097]

[0098] The energy elimination rate of each valve under different working conditions is shown in Table 6.

[0099] Table 4 Peak wave elimination rate of valve under various working conditions

[0100]

[0101] Table 5 Specific impulse damping rate of valve under various working conditions

[0102]

[0103] Table 6 Energy wave elimination rate of valve under various working conditions

[0104]

[0105] Note: Under working condition 2, the HK200 (5) sealant strip was partially torn and fell off, and the calculation results are for reference only. The valve core of NPV-KK (5) and ZPSXBM (5) was stuck, and the calculation results are for reference only.

[0106] As for the residual pressure at the valve outlet, when the shock wave overpressure at the valve inlet is consistent, the residual pressure at the valve outlet is determined by the valve closing time and the sealing effect of the valve core sealing structure after the valve is closed.

[0107] For the suspended swing valve, it adopts a rubber strip seal. After the valve is closed, the pressure leakage of its sealing structure is very small, and the residual pressure mainly depends on the closing time of the suspended swing. For the valve with a circular tube valve core structure, it adopts a wire sealing structure, and there is a certain pressure leakage after the valve core is closed. When the pressure at the inlet of the valve is large, although the closing time of its valve core will be shortened, the residual pressure will increase with the increase of the overpressure at the inlet due to the influence of the sealing structure of the valve. For the trial-produced circular tube valve core structure valve, the matching of its valve core closing time and the leakage of the sealing structure can make its outlet residual pressure within a reasonable range. For short-term shock wave loads (less than 100ms), residual pressure control has obvious technical advantages. The residual pressure data of each participating valve are shown in Table 7.

[0108] Table 7 Residual pressure of valve diffusion box under various working conditions

[0109]

[0110] Note: The mean value is calculated 100ms before the shock wave.

[0111] In terms of reusability, most existing explosion-proof valves are designed to be disposable. After being affected by shock waves, their physical structure and wave-absorbing performance will change significantly. Designing reusable explosion-proof valves can effectively reduce product use costs and avoid the problem of equipment replacement in the later stage.

[0112] The circular tube valve core structure valve manufactured this time is designed to be reusable. Through the chemical explosion test under the design resistance and the super design resistance, its structure has sufficient safety margin. In terms of design principle, the structure relies on the line sealing structure between the valve core and the valve body for sealing, without special sealing materials. All materials of the equipment are metal structures with strong high temperature resistance. Within the design resistance, the equipment can be reused, and its wave absorbing performance can be maintained within the design range.

[0113] From the above, it can be seen that the present invention provides a test device for testing the wave-absorbing performance of an explosion-proof wave valve. The test device for testing the wave-absorbing performance of an explosion-proof wave valve is used in conjunction with an impact tube, and comprises: a reverse load-bearing frame fixedly installed relative to the impact tube, a mounting interface being arranged on the reverse load-bearing frame; a mounting panel arranged on the mounting interface and fixedly installed relative to the reverse load-bearing frame, a mounting port being arranged on the mounting panel, and a mounting structure for installing a specimen being arranged on the mounting port, the mounting structure being designed according to the contour shape, size or installation requirements of the specimen to meet the fixed setting of different specimens on the mounting panel.

[0114] Through the above-mentioned structural design, the explosion-proof wave valve wave-absorbing performance test device provided by the present invention is provided with an installation structure. The installation structure is designed according to different samples, and can be installed on different types of samples or ready-made comparison samples, so as to realize comparative tests, that is, the samples and comparison samples are tested simultaneously during a test process. While obtaining the performance parameters of each sample and comparison sample, these parameters can also be compared, providing a reliable theoretical basis for improving the design of the sample.

[0115] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A test device for the wave-absorbing performance of explosion-proof valves, characterized in that: For use with shock tubes, including: A reverse bearing frame fixedly mounted relative to the impact tube, wherein a mounting interface is provided on the reverse bearing frame; A mounting panel (1) is arranged on the mounting interface and fixedly arranged relative to the reverse bearing frame, a mounting opening is arranged on the mounting panel, and a mounting structure (2) for mounting a sample is arranged on the mounting opening, wherein the mounting structure is designed according to the contour shape, size or installation requirements of the sample to meet the requirements of fixing different samples on the mounting panel.

2. The explosion-proof valve wave-absorbing performance test device according to claim 1 is characterized in that: It also includes a bearing frame (3), which can be fixedly arranged on the mounting interface and is used to fix the mounting panel; The supporting frame is a rectangular frame structure, a front mounting plate is provided on the front side of the supporting frame, a rear mounting plate is provided on the rear side of the supporting frame, the mounting panel is provided on the front side of the supporting frame, the outer contour of the mounting panel is used to abut against the front mounting plate and be fixedly connected by bolts, and the rear mounting plate includes at least upper and lower plate structures, which are used to be fixedly connected to the reverse load-bearing frame by bolts.

3. The explosion-proof valve wave-absorbing performance test device according to claim 1 is characterized in that: The mounting structure is a frame-type structure that protrudes forward relative to the front side of the mounting panel. The internal space of the mounting structure is used to be fixedly connected to the outer frame of the sample and to achieve contactless installation of the sample valve core. The internal space size of the mounting structure is not less than the outer contour size of the sample.

4. The explosion-proof valve wave-absorbing performance test device according to claim 3 is characterized in that: The installation port includes a sample installation port and a comparison installation port. The sample to be tested is arranged on the sample installation port through the installation structure, and the comparison sample for the test is arranged on the comparison installation port.

5. The explosion-proof valve wave-absorbing performance test device according to claim 4 is characterized in that: A first pressure sensor mounting hole is arranged on the mounting panel, and a plurality of first pressure sensor mounting holes are arranged at equal intervals in the height direction.

6. The explosion-proof valve wave-absorbing performance test device according to claim 5 is characterized in that: An auxiliary plate is fixedly arranged relative to the mounting panel. The auxiliary plate is arranged parallel to the mounting panel. The auxiliary plate is arranged flush with the front end surface of the mounting structure. A second pressure sensor mounting hole is arranged on the auxiliary plate. There are multiple second pressure sensor mounting holes and they are arranged at intervals in the horizontal direction.

7. The explosion-proof valve wave-absorbing performance test device according to claim 6 is characterized in that: A diffusion box (4) is arranged on the back of the installation panel corresponding to the installation opening, one end of the diffusion box covers the corresponding installation opening and is fixedly connected to the installation panel, and the other end of the diffusion box is provided with an air hole.

8. The explosion-proof valve wave-absorbing performance test device according to claim 7 is characterized in that: A third pressure sensor mounting hole is provided on the diffusion box, and a plurality of the third pressure sensor mounting holes are provided and are arranged at equal intervals along the depth direction of the diffusion box.

9. The explosion-proof valve wave-absorbing performance test device according to claim 8 is characterized in that: A fourth pressure sensor mounting hole is provided on the diffusion box. The fourth pressure sensor mounting hole is provided on both sides of the diffusion box and is located in the same vertical plane as the first third pressure sensor mounting hole.

10. The explosion-proof valve wave-absorbing performance test device according to claim 9 is characterized in that: A pressure sensor is arranged in each pressure sensor installation hole. The pressure sensor is connected to an external signal processing device via a data line, and the data line is routed from the back side of the installation panel.

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