CN115967452B - Radio frequency electromagnetic energy explosion-proof ignition test device and method - Google Patents
Radio frequency electromagnetic energy explosion-proof ignition test device and method Download PDFInfo
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- CN115967452B CN115967452B CN202310252513.0A CN202310252513A CN115967452B CN 115967452 B CN115967452 B CN 115967452B CN 202310252513 A CN202310252513 A CN 202310252513A CN 115967452 B CN115967452 B CN 115967452B
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Abstract
The invention discloses a radio frequency electromagnetic energy explosion-proof ignition test device and a method. The relative movement of the metal disc and the tungsten wire electrode is realized by a driving motor, and the explosion generator is filled with combustible gas; controlling a radio frequency source to output a radio frequency signal to an explosion generator through a directional coupler; when the sensor detects that explosion occurs in the explosion generator, a first power value detected by the first power meter and a second power value detected by the second power meter are obtained through the power calculation circuit, the current feed-in energy of the explosion generator is obtained based on the first power value and the second power value, and the current feed-in energy is determined as a safe energy threshold of the radio frequency source.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a radio frequency electromagnetic energy explosion-proof ignition test device and method.
Background
The large bandwidth, low delay and wide connection of the 5G technology are the technical basis for realizing the intelligent efficient operation of the coordination of each system. China is actively pushing the application of the 5G technology in various industrial scenes, however GB/T3836.1, part 1 of the explosive Environment: the general requirements of equipment are that for a radio frequency source of 9 kHz-60 GHz, the threshold power of the type I explosive environment radio frequency signal cannot exceed 6W (average time of 200 us), the threshold power of the type IIA explosive environment radio frequency signal cannot exceed 6W (average time of 100 us), the threshold power of the type IIB explosive environment radio frequency signal cannot exceed 3.5W (average time of 80 us), and the threshold power of the type IIC explosive environment radio frequency signal cannot exceed 2W (average time of 20 us), which greatly restricts the application of the 5G communication technology in special scenes. For example, in the underground practical application of the 5G technology in a coal mine, in order to meet the electromagnetic wave explosion-proof limit value in the literal sense of the current explosion-proof standard, indoor equipment with the nominal transmitting power of 250mW is generally adopted, after explosion-proof modification, the feeder line loss and the loss of isolation components are considered, the practical transmitting power is smaller, the coverage range of the maximum communication distance in the actual-measured transportation roadway is less than 300m, the maximum communication coverage range in the coal face is only 30-40 m, and the edge transmission rate is only about 10 Mbit/s. In this limitation, the advantages of the 5G technology are not fully exploited.
It should be noted that the above-mentioned index originates from the last 80 th century, and is limited by the development of related technologies, and both the test method and the theoretical research have certain defects, which are not suitable for being used as the standard of the 5G technology, and the existing measurement circuit is generally used for measuring the power of the radio frequency source, but there is a problem that many powers are reflected at the transmitting end of the radio frequency source connected with the transmitting antenna, so that it is difficult to obtain accurate measurement and estimation.
Disclosure of Invention
The embodiment of the invention provides a radio frequency electromagnetic energy explosion-proof ignition test device and a radio frequency electromagnetic energy explosion-proof ignition test method, which realize the accurate measurement of a power safety threshold value of a radio frequency source in an explosion place, provide a basis for the standard revision of the power safety threshold value of the radio frequency electromagnetic energy in a 5G frequency band aiming at the popularization and application of a 5G communication technology in various explosion places, and fully exert the efficacy of the 5G communication technology.
In a first aspect, the present application provides, by way of an embodiment, the following technical solutions:
a radio frequency electromagnetic energy explosion-proof ignition test device comprises a first power meter, a second power meter, a directional coupler, an explosion generator and a power calculation circuit;
the coupling end of the directional coupler is connected with the first power meter;
the direct end of the directional coupler is connected with the explosion generator, and the second power meter is connected between the direct end of the directional coupler and the explosion generator;
the explosion generator is provided with a sensor which is used for detecting whether explosion occurs in the explosion generator or not;
when an electromagnetic energy explosion-proof ignition test is carried out, the explosion generator is filled with combustible gas, the input end of the directional coupler is connected with a radio frequency source, the radio frequency source is used for inputting radio frequency signals to the explosion generator through the directional coupler, and the power calculation circuit is used for obtaining the current feed-in energy of the explosion generator based on the first power meter and the second power meter when the sensor detects that the explosion generator is exploded, and determining the current feed-in energy as a safe energy threshold of the radio frequency source.
In some embodiments, the explosion generator comprises a housing, a drive shaft, a first dipole antenna metal tube, a metal disc, a second dipole antenna metal tube, and a feed electrode:
the box body is internally provided with a closed explosion cavity and is provided with an air inlet valve and an air exhaust valve;
the driving shaft is axially arranged along the box body, one end of the driving shaft penetrates through the box body and extends into the box body, and the other end of the driving shaft extends out of the box body and is connected with the driving motor;
the first dipole antenna metal tube sleeve is fixed on the outer wall of the driving shaft;
the metal disc is sleeved on the first dipole antenna metal tube and positioned in the box body, and at least one notch is uniformly formed in the metal disc along the circumferential direction;
the second dipole antenna metal tube is fixedly arranged on the inner wall of the box body, the second dipole antenna metal tube and the first dipole antenna metal tube are coaxially arranged, one end, facing the metal disc, of the second dipole antenna metal tube is sleeved with a conductive disc, and the conductive disc and the metal disc are parallel and coaxial;
one end of the feed electrode is electrically connected with the conductive disc, the other end of the feed electrode faces the metal disc, and when the other end of the feed electrode is positioned in the notch, the other end of the feed electrode is not in contact with the metal disc; when the other end of the feed electrode is positioned outside the notch, the other end of the feed electrode is abutted with the metal disc;
when an electromagnetic energy explosion-proof test is carried out, the driving motor is used for driving the metal plate to rotate relative to the feed electrode, so that the feed electrode is intermittently contacted with the plate surface of the metal plate, and the combustible gas is ignited after the output power of the radio frequency source reaches a threshold value.
In some embodiments, the first dipole antenna metal tube is connected to the inner wall of the housing by a support bearing for supporting the first dipole antenna metal tube and the drive shaft.
In some embodiments, the drive shaft is rotatably coupled to the housing via a drive shaft seal.
In some embodiments, the housing is provided with a viewing window.
In some embodiments, the viewing window is provided with a vent that is plugged with a rubber plug.
In some embodiments, the metal disc is electrically connected with the metal tube of the first dipole antenna.
In some embodiments, the feed is a tungsten wire and the metal disk is a cadmium disk.
In some embodiments, the test device further comprises a radio frequency source and a load;
the output end of the radio frequency source is connected with the input end of the directional coupler, and the load is connected with the isolation end of the directional coupler.
In some embodiments, a circulator is connected between the pass-through end of the directional coupler and the explosion generator.
In some embodiments, an attenuator is disposed between the circulator and the second power meter for protecting the second power meter.
In a second aspect, based on the same inventive concept, the present application provides, by way of an embodiment, the following technical solutions:
a method for testing the explosion-proof ignition of radio frequency electromagnetic energy, comprising:
filling the explosion generator with combustible gas;
controlling the radio frequency source to be connected with the input end of the directional coupler, and controlling the radio frequency source to output radio frequency signals with increasing power to the explosion generator through the directional coupler;
when the sensor detects that explosion occurs in the explosion generator, a first power value detected by the first power meter and a second power value detected by the second power meter are obtained through the power calculation circuit, current feed-in energy of the explosion generator is obtained based on the first power value and the second power value, and the current feed-in energy is determined to be a safe energy threshold of the radio frequency source.
In some embodiments, said charging the explosive generator with a combustible gas comprises:
controlling an air inlet valve and an air outlet valve to introduce combustible gas, discharging original gas in the air inlet valve and the air outlet valve, and closing the air inlet valve and the air outlet valve at the same time;
with reference to the first aspect of the present invention, in some embodiments, after the controlling the radio frequency source to connect to the input end of the directional coupler, the method further includes:
controlling the driving motor to drive the metal disc to rotate at a constant speed through the driving shaft so as to intermittently contact the feed electrode with the metal disc according to a set period;
the controlling the radio frequency source to output radio frequency signals with increasing power to the explosion generator through the directional coupler comprises the following steps:
and controlling the radio frequency source to output a radio frequency signal with increasing power so that when the power of the radio frequency source reaches a threshold value, the feed electrode and the metal disc generate electric spark discharge to ignite the combustible gas in the closed explosion cavity.
In some embodiments, the combustible gas comprises: the preset ratio of air to at least one of hydrogen, ethylene, methane and acetylene.
The one or more technical solutions provided by the embodiments of the present invention at least achieve the following technical effects or advantages:
the invention electrically connects the explosion generator, transmits signals to reach a certain threshold value through the radio frequency source until the explosion of the explosion generator is detected by the sensor, and performs power detection on the first power meter and the second power meter at two sides of the explosion generator to obtain the energy fed into the explosion generator, thereby obtaining the power safety threshold value of the 5G radio frequency source in the explosion place more accurately, giving full play to the efficiency of the 5G communication technology.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a connection structure of a radio frequency electromagnetic energy explosion-proof ignition test apparatus in an embodiment of the present invention;
FIG. 2 is a schematic view of the overall structure of the case according to the embodiment of the present invention;
FIG. 3 is a schematic longitudinal section of FIG. 2 according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating the internal structure of FIG. 2 according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a connection structure of a ring protector, an attenuator, a radio frequency source, and a load according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of a connection structure between a metal disc and a metal tube of a first dipole antenna according to an embodiment of the present invention;
FIG. 7 is a flow chart of an experimental method in an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The description as it relates to "first", "second", etc. in the present invention is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
In a first aspect, in an alternative embodiment, referring to fig. 1 and 2, there is provided a radio frequency electromagnetic energy explosion-proof ignition test apparatus, comprising a first power meter 001, a second power meter 002, a directional coupler 003, an explosion generator 004 and a power calculation circuit 005;
the coupling end of the directional coupler 003 is connected with a first power meter 001;
the through end of the directional coupler 003 is connected with the explosion generator 004, and the second power meter 002 is connected between the through end of the directional coupler 003 and the explosion generator 004;
the explosion generator 004 is provided with a sensor for detecting whether explosion occurs in the explosion generator 004, and the sensor can be a vibration sensor or a sound sensor;
when an electromagnetic energy explosion-proof ignition test is carried out, the explosion generator 004 is filled with combustible gas, the input end of the directional coupler 003 is connected with a radio frequency source, the radio frequency source is used for inputting radio frequency signals to the explosion generator 004 through the directional coupler 003, the power calculation circuit 005 is used for obtaining the current feed-in energy of the explosion generator 004 based on the first power meter 001 and the second power meter 002 when the sensor detects that explosion occurs in the explosion generator 004, and determining the current feed-in energy as a safe energy threshold of the radio frequency source.
The principle of the test device provided in this embodiment is: the electric connection of the feed electrode is periodically switched on and off, so that the explosion generator explodes. In the process, by traversing the power parameters of the radio frequency source, under the condition that the radio frequency source is not expected to couple electromagnetic wave energy to a metal conductor in an explosive place and the on-off state of a circuit is changed, igniting gas in an explosion generator, and obtaining the power safety threshold of the radio frequency source through a power calculation circuit while detecting explosion through a sensor.
The test device provided by the invention has the beneficial effects that: the invention continuously increases the frequency of the radio frequency source through the electric connection in the explosion generator until the explosion of the explosion generator is detected by the sensor, performs power detection on the first power meter and the second power meter at two sides of the explosion generator, and then obtains the energy fed into the explosion generator through difference value calculation, thereby obtaining the power safety threshold of the 5G radio frequency source in an explosion place more accurately, fully playing the technical effect of 5G communication, and in addition, the invention isolates the signal of the first power meter through the directional coupler arranged in the circuit, thereby greatly reducing the energy loss of the signal power of the radio frequency source at the direct coupling end of the first power meter and the circuit, and improving the measurement accuracy.
Therefore, the invention can obtain the power safety threshold value of the 5G radio frequency source in the explosion place more accurately, and fully exert the efficacy of the 5G communication technology.
The explosion generator can adopt a structure of the first invention, which is used for measuring the feed-in energy when the special explosion device simulating the coaxial cable ignites explosion gas, namely a safety threshold, and the structure comprises the coaxial cable, a driving motor, a gas transmission pipe, an insulating support bushing, a closed explosion cavity, an outer conductor, a metal disc, an inner conductor, a feed electrode and other parts, wherein the driving motor drives the outer conductor to rotate, so that the feed electrode and the metal disc relatively rotate, and when the feed electrode is scratched on the metal disc, the feed electrode is periodically connected with the metal disc in a 'contact-disconnection-contact' way, and the electric connection is correspondingly changed.
In view of the energy detection requirements of the transmitting end, this embodiment discloses an explosion generator.
In some embodiments, referring to fig. 2 and 3 and fig. 4, the explosion generator includes a case 1, a driving shaft 2, a first dipole antenna metal tube 3, a metal disc 4, a second dipole antenna metal tube 5, and a feeding electrode 6:
a closed explosion cavity 11 is arranged in the box body 1, and the box body 1 is provided with an air inlet valve 12 and an air outlet valve 13;
the driving shaft 2 is axially arranged along the box body 1, one end of the driving shaft 2 penetrates through the box body 1 and extends into the box body 1, and the other end of the driving shaft 2 extends out of the box body 1 and is connected with the driving motor 21;
the first dipole antenna metal tube 3 is sleeved and fixed on the outer wall of the driving shaft 2;
the metal disc 4 is sleeved on the first dipole antenna metal tube 3, and it should be noted that the metal disc 4 is electrically connected with the first dipole antenna metal tube 3 and is located inside the box 1, and at least one notch 41 is uniformly arranged on the metal disc 4 along the circumferential direction, and specifically, the notch 41 may be a notch or a perforation;
the second dipole antenna metal tube 5 is fixedly arranged on the inner wall of the box body 1, the second dipole antenna metal tube 5 and the first dipole antenna metal tube 3 are coaxially arranged, a conductive disc 51 is sleeved at one end, facing the metal disc 4, of the second dipole antenna metal tube 5, the conductive disc 51 is electrically connected with the second dipole antenna metal tube 5, the conductive disc 51 and the metal disc 4 are parallel and coaxial, and the conductive disc 51 is a flange or a conductive disc;
referring to fig. 4 and 6, one end of the feeding electrode 6 is electrically connected to the conductive plate 51, the other end of the feeding electrode 6 faces the metal plate 4, and when the other end of the feeding electrode is positioned in the notch 41, the other end of the feeding electrode 6 is not in contact with the bottom of the notch 41; when the other end of the power electrode 6 is positioned outside the notch 41, the other end of the power electrode 6 is abutted against the plate surface of the metal plate 4, so that the effect that the metal plate 4 is intermittently or periodically connected with the power electrode 6 in a 'contact-disconnection-contact' manner is achieved;
in another alternative embodiment, the positions of the feed electrode 6 and the metal disc 4 may be interchanged.
In another alternative embodiment, the notch 41 may be provided in the circumferential surface of the metal disc 4 so that the feeding electrode rotates with respect to the circumferential surface of the metal disc 4.
When the electromagnetic energy explosion-proof test is carried out, the driving motor 21 is used for driving the metal disc 4 to rotate relative to the feed electrode 6 so as to enable the feed electrode 6 to intermittently contact with the surface of the metal disc 4, and the flammable gas is ignited after the output power of the radio frequency source reaches a threshold value.
It can be appreciated that the explosion generator is based on dipole antenna design, and by providing the notch 41 on the metal disc 4 of the dipole antenna, the driving motor 21 drives the metal disc 4 to rotate at a constant speed relative to the feed electrode 6, so that the periodic change of the resonant dipole antenna from a normal working state to an open-circuit state is realized, and dangerous sparks can be caused and explosive gases can be ignited in the process of switching the electrical state.
In some embodiments, the first dipole antenna metal tube 3 is connected to the inner wall of the case 1 through a support bearing 31, where the support bearing 31 is used to support the first dipole antenna metal tube 3 and the driving shaft 2, and specifically, the support bearing 31 may be disposed in the middle of the first dipole antenna metal tube 3, or may be disposed at an end of the first dipole antenna metal tube 3 near the feeding electrode 6.
In some embodiments, the drive shaft 2 is rotatably connected to the housing 1 by a drive shaft seal, which may be a glain ring.
In some embodiments, the case 1 is provided with a viewing window 14, the viewing window 14 may be made of transparent materials such as polyethylene plastic, glass or acryl, and the viewing window 14 is disposed on the top surface of the case 1, so as to facilitate the observation of all conditions in the case 1.
In some embodiments, the viewing window 14 is provided with a vent 141, the vent 141 being plugged with a rubber stopper, and in particular, a vent 141 is provided to vent part of the explosion pressure to prevent the explosion from injuring the test personnel.
In some embodiments, the metal disc 4 is electrically connected to the first dipole antenna metal tube 3.
In some embodiments, the feeder electrode 6 is a tungsten wire and the metal disk 4 is a cadmium disk, and during the test, it was found that using the tungsten wire and the cadmium disk as the sparking electrodes has the highest sparking efficiency.
In some embodiments, referring to fig. 5, a radio frequency source 006 and a load 007 are also included;
the output end of the radio frequency source 006 is connected with the input end of the directional coupler 003, the load 007 is connected with the isolation end of the directional coupler 003, and the load 007 and the radio frequency source 006 can form a whole complete radio frequency loop, so that the complete radio frequency loop can prevent signal reflection.
In some embodiments, a circulator 008 is connected between the through end of the directional coupler 003 and the explosion generator 004, and the circulator 008 is used for protecting the rf source 006.
In some embodiments, an attenuator 009 for protecting the second power meter 002 is provided between the circulator 008 and the second power meter 002, the attenuator 009 selecting an adapted model according to the model of the second power meter 002.
In a second aspect, in another alternative embodiment, referring to fig. 7, there is provided a method of testing an explosion-proof ignition of radio frequency electromagnetic energy, the method comprising:
s1, filling combustible gas into an explosion generator 004;
s2, a control radio frequency source 006 is connected with the input end of a directional coupler 003, and the control radio frequency source 006 outputs radio frequency signals with increasing power to an explosion generator 004 through the directional coupler 003;
s3, when the sensor 0041 detects that an explosion occurs in the explosion generator 004, the power calculation circuit 005 obtains a first power value detected by the first power meter 001 and a second power value detected by the second power meter 002, obtains the current feeding energy of the explosion generator based on the first power value and the second power value, and determines the current feeding energy as a safe energy threshold of the radio frequency source 006.
The test method provided in this embodiment has advantages consistent with those of the embodiment of the first aspect, and will be described with reference to the embodiments of the first aspect.
The current feed-in energy can obtain a calculation result according to the difference value of the first power value and the second power value.
In some embodiments, charging the explosive generator with a combustible gas includes:
the air inlet valve 12 and the air outlet valve 13 are controlled to be filled with combustible gas, after the original gas in the air inlet valve is exhausted, the air inlet valve 12 and the air outlet valve 13 are closed at the same time, and compared with a common air inlet mode which only uses the air inlet valve to carry out air inlet, the air inlet valve can carry out more accurate variable control on the gas components in the air inlet valve, so that the attack measurement result is more accurate.
In some embodiments, after controlling the rf source 006 to connect to the input of the directional coupler 003, the method further comprises:
the driving motor 21 is controlled to drive the metal disc 4 to rotate at a constant speed through the driving shaft 2 so as to intermittently contact the feed electrode 6 with the metal disc 4 according to a set period;
controlling the rf source 006 to output rf signals of increasing power to the blast generator 004 through the directional coupler 003 comprises:
the rf source 006 is controlled to output an rf signal with increasing power so that when the power of the rf source 006 reaches a threshold, the feeder electrode 6 and the metal disc 4 generate an electric spark discharge to ignite the combustible gas in the closed explosion chamber.
In some embodiments, the combustible gas includes: at least one of air, hydrogen, ethylene, methane and acetylene in a preset proportion, it can be understood that the components are controllable through the combustible gas in the preset proportion, the control variable is more convenient for the combustible components in the experimental process, the measurement result is more accurate, and the preset proportion can be: the volume ratio of air to other gases is: 1:2 or 2:1, wherein the other gas may be not only one gas of hydrogen, ethylene, methane and acetylene, but also a mixture of at least 2 gases of hydrogen, ethylene, methane and acetylene.
The dipole antenna in the structure of the invention is designed by impedance matching, and different 5G signal frequencies can be applied by adopting different dipole antennas, including but not limited to typical frequencies of 5G technology, such as 700MHz, 2.1GHz, 2.6GHz and 3.5GHz.
The following are optional impedance matching modes:
voltage Standing Wave Ratio (VSWR): the standing wave ratio is equal to 1, which means that the impedance of the feeder line and the antenna is completely matched, and at the moment, all high-frequency energy is radiated by the antenna without energy reflection loss; at infinity standing wave ratio, total reflection is indicated, and no energy is radiated.
Where K is the reflectance (ratio of reflected voltage to input voltage) which is an important indicator of how much the signal is reflected.
It will be appreciated that by impedance adjustment, the amount of energy reflection from the radio frequency source can be minimized.
The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software that is executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or a combination of any of these. In addition, each functional unit may be integrated in one processing unit, each unit may exist alone physically, or two or more units may be integrated in one unit.
In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate components may or may not be physically separate, and components as control devices may or may not be physical units, may be located in one place, or may be distributed over a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above is only an embodiment of the present invention and is not intended to limit the present invention, and various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (14)
1. The radio frequency electromagnetic energy explosion-proof ignition test device is characterized by comprising a first power meter, a second power meter, a directional coupler, an explosion generator and a power calculation circuit;
the coupling end of the directional coupler is connected with the first power meter;
the direct end of the directional coupler is connected with the explosion generator, and the second power meter is connected between the direct end of the directional coupler and the explosion generator;
the explosion generator is provided with a sensor which is used for detecting whether explosion occurs in the explosion generator or not;
when an electromagnetic energy explosion-proof ignition test is carried out, the explosion generator is filled with combustible gas, the input end of the directional coupler is connected with a radio frequency source, the radio frequency source is used for inputting radio frequency signals to the explosion generator through the directional coupler, the power calculation circuit is used for obtaining the current feed-in energy of the explosion generator based on the first power meter and the second power meter when the sensor detects that explosion occurs in the explosion generator, and determining the current feed-in energy as a safe energy threshold of the radio frequency source;
the explosion generator comprises a box body, a driving shaft, a first dipole antenna metal tube, a metal disc, a second dipole antenna metal tube and a feed electrode:
the box body is internally provided with a closed explosion cavity and is provided with an air inlet valve and an air exhaust valve;
the driving shaft is axially arranged along the box body, one end of the driving shaft penetrates through the box body and extends into the box body, and the other end of the driving shaft extends out of the box body and is connected with a driving motor;
the first dipole antenna metal tube sleeve is fixed on the outer wall of the driving shaft;
the metal disc is sleeved and fixed on the metal tube of the first dipole antenna and is positioned in the box body, and at least one notch is uniformly formed in the metal disc along the circumferential direction;
the second dipole antenna metal tube is fixedly arranged on the inner wall of the box body, the second dipole antenna metal tube and the first dipole antenna metal tube are coaxially arranged, one end, facing the metal disc, of the second dipole antenna metal tube is sleeved with a conductive disc, and the conductive disc and the metal disc are parallel and coaxial;
one end of the feed electrode is electrically connected with the conductive disc, the other end of the feed electrode faces the metal disc, and when the other end of the feed electrode is positioned in the notch, the other end of the feed electrode is not in contact with the metal disc; when the other end of the feed electrode is positioned outside the notch, the other end of the feed electrode is abutted with the metal disc;
when an electromagnetic energy explosion-proof test is carried out, the driving motor is used for driving the metal plate to rotate relative to the feed electrode, so that the feed electrode is intermittently contacted with the plate surface of the metal plate, and the combustible gas is ignited after the output power of the radio frequency source reaches a threshold value.
2. The test device of claim 1, wherein the first dipole antenna metal tube is connected to the interior wall of the housing by a support bearing, the support bearing being configured to support the first dipole antenna metal tube and the drive shaft.
3. The test device of claim 1, wherein the drive shaft is rotatably coupled to the housing via a drive shaft seal.
4. The test device of claim 1, wherein the housing is provided with an observation window.
5. The test device of claim 4, wherein the viewing window is provided with a vent, the vent being plugged with a rubber plug.
6. The test device of claim 1, wherein the metal disc is electrically connected to the metal tube of the first dipole antenna.
7. The test device of claim 1, wherein the feed is a tungsten wire and the metal disc is a cadmium disc.
8. The test device of claim 1, further comprising a radio frequency source and a load;
the output end of the radio frequency source is connected with the input end of the directional coupler, and the load is connected with the isolation end of the directional coupler.
9. The test device of claim 1, wherein a circulator is connected between the pass-through end of the directional coupler and the explosion generator.
10. The test device of claim 9, wherein an attenuator is disposed between the circulator and the second power meter for protecting the second power meter.
11. A radio frequency electromagnetic energy explosion-proof ignition test method, characterized in that the method is applied to the test device according to any one of claims 1 to 10, and the test method comprises the following steps:
filling the explosion generator with combustible gas;
controlling the radio frequency source to be connected with the input end of the directional coupler, and controlling the radio frequency source to output radio frequency signals with increasing power to the explosion generator through the directional coupler;
when the sensor detects that explosion occurs in the explosion generator, a first power value detected by the first power meter and a second power value detected by the second power meter are obtained through the power calculation circuit, current feed-in energy of the explosion generator is obtained based on the first power value and the second power value, and the current feed-in energy is determined to be a safe energy threshold of the radio frequency source.
12. The test method of claim 11, wherein said charging said explosion generator with a combustible gas comprises:
and controlling an air inlet valve and an air outlet valve to introduce combustible gas, discharging the original gas inside, and closing the air inlet valve and the air outlet valve at the same time.
13. The method of testing of claim 11, wherein after said controlling said radio frequency source to connect to said input of said directional coupler, said method further comprises:
controlling the driving motor to drive the metal disc to rotate at a constant speed through the driving shaft so as to intermittently contact the feed electrode with the metal disc according to a set period;
the controlling the radio frequency source to output radio frequency signals with increasing power to the explosion generator through the directional coupler comprises the following steps:
and controlling the radio frequency source to output a radio frequency signal with increasing power so that when the power of the radio frequency source reaches a threshold value, the feed electrode and the metal disc generate electric spark discharge to ignite the combustible gas in the closed explosion cavity.
14. The test method of claim 11, wherein the combustible gas comprises: the preset ratio of air to at least one of hydrogen, ethylene, methane and acetylene.
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| CN103728487A (en) * | 2013-07-17 | 2014-04-16 | 中国人民解放军军械工程学院 | Method for metering real radio frequency detonating energy of electric initiating explosive device |
| CN104730382A (en) * | 2015-03-04 | 2015-06-24 | 广州特种机电设备检测研究院 | Device and method for detecting anti-explosion performance of electromagnetic radiation electric equipment |
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