CN210834734U - Minimum ignition energy and quenching distance testing device for gas mixture - Google Patents
Minimum ignition energy and quenching distance testing device for gas mixture Download PDFInfo
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- CN210834734U CN210834734U CN201921741728.4U CN201921741728U CN210834734U CN 210834734 U CN210834734 U CN 210834734U CN 201921741728 U CN201921741728 U CN 201921741728U CN 210834734 U CN210834734 U CN 210834734U
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Abstract
The utility model relates to a gaseous explosion performance test technical field provides a gas mixture minimum ignition can and quenching apart from testing arrangement. The device of the utility model comprises a control box, a spherical reaction container, a support frame, an electric spark generation system and a gas distribution system; the spherical reaction vessel comprises a spherical reaction part and a base; the electric spark generation system comprises two groups of electric spark generation assemblies which are symmetrically arranged on two sides of a vertical section passing through a spherical center, wherein each electric spark generation assembly comprises a metal electrode, a screw cap, an adjusting bolt, an insulating end, an electrode joint, an electrode sleeve and an insulating flange; the gas distribution system comprises a vacuum pump, a pressure sensor, a temperature sensor and a gas block valve; the control box comprises a high-voltage power supply, a relay and a capacitor bank, wherein the high-voltage power supply is electrically connected with the capacitor bank through the relay, and the anode and the cathode of the capacitor bank are respectively connected with the two electrode rods. The utility model discloses can test gaseous minimum ignition ability and quenching distance in a device, and improve the test accuracy.
Description
Technical Field
The utility model relates to a gaseous explosion performance test technical field especially relates to a gas mixture minimum ignition can and quenching apart from testing arrangement.
Background
The minimum ignition energy MIE of a gas is the minimum energy at which the gas can be ignited most easily, enabling the gas flame to propagate deflagration). The minimum ignition energy of the gas is an important basis for determining the explosion-proof method of the area in which the gas is located. Special explosion protection measures should be taken when the minimum ignition energy is very low.
Whether the energy of the striking friction spark and the electrostatic spark with small released energy is larger than the minimum ignition energy or not is an important condition for judging whether the striking friction spark and the electrostatic spark can be used as a fire source to trigger a fire and explosion accident or not.
However, the application of the quenching distance requires caution, since it is mainly applicable in the ignition phase and represents only the quenching distance at the initial pressure, unlike the quenching distance at higher pressures. When a fire risk assessment is made taking into account all factors related to the material application, the result can be one of the factors of the fire risk assessment.
In the prior art, manual centering is mostly adopted for centering of the metal electrode, the error is high, and therefore the testing accuracy is not high enough. And there is no technique for testing the minimum ignition energy and quenching distance of a gas in one device.
SUMMERY OF THE UTILITY MODEL
Problem to prior art existence, the utility model provides a gaseous mixture minimum ignition can and quench apart from testing arrangement, can test gaseous minimum ignition can and quench apart from in a device, and improve the test accuracy.
The technical scheme of the utility model is that:
a gas mixture minimum ignition energy and quenching distance testing device is characterized in that: comprises a control box, a spherical reaction container, a support frame, an electric spark generation system and a gas distribution system;
the inner cavity of the spherical reaction container is spherical, and the spherical reaction container comprises a spherical reaction part and a base;
the lower part of the spherical reaction part is cut by a first horizontal plane, and then a mounting edge extends outwards from the bottom of the outer side wall to form an inner cavity of the spherical reaction part, and two first circular through holes with axes passing through the center of sphere are symmetrically formed in the spherical reaction part on two sides of the vertical section passing through the center of sphere;
the base is in a stepped shaft form, and the diameter of an upper shaft section of the base is larger than that of a lower shaft section of the base; the upper end of the upper shaft section of the base is provided with a first spherical groove which is concentric with the inner cavity of the spherical reaction part, the first spherical groove and the inner cavity of the spherical reaction part jointly form the inner cavity of the spherical reaction container, and the upper shaft section of the base is connected with the mounting edge through a plurality of first bolts; the side wall of the upper shaft section of the base is provided with a first circular groove, the bottom of the first circular groove is provided with a second circular through hole, and the inner wall of the first circular groove is provided with an internal thread; a second circular groove is formed in the lower end of the lower shaft section of the base, a third circular groove and a fourth circular groove are formed in the groove bottom of the second circular groove, a third circular through hole is formed in the groove bottom of the third circular groove, a fourth circular through hole is formed in the groove bottom of the fourth circular groove, and internal threads are formed in the inner wall of the fourth circular through hole;
the support frame is arranged on the upper surface of the control box, and the upper end of the support frame is connected with the lower shaft section of the base through a plurality of second bolts;
the electric spark generation system comprises two groups of electric spark generation assemblies which are symmetrically arranged on two sides of a vertical section passing through the center of a sphere; the electric spark generation assembly comprises a metal electrode, a nut, an adjusting bolt, an insulating end, an electrode joint, an electrode sleeve and an insulating flange, wherein the metal electrode comprises an electrode rod and an electrode tip;
the electrode joint is cylindrical, one end of the electrode joint is welded inside the first circular through hole, a fifth circular groove is formed in the end face of the other end of the electrode joint, and a fifth circular through hole is formed in the bottom of the groove in the fifth circular groove;
the insulating end is in a stepped shaft form and sequentially comprises a first shaft section, a second shaft section, a third shaft section and a fourth shaft section from inside to outside, the first shaft section is in a circular truncated cone shape, and the diameter of the third shaft section is larger than that of the second shaft section and that of the fourth shaft section; a sixth circular groove is formed in the end face of the outer end of the insulating end, internal threads are formed in the inner wall of the sixth circular groove, a sixth circular through hole is formed in the groove bottom of the sixth circular groove, the first shaft section penetrates through the fifth circular through hole, and the end face, close to the second shaft section, of the third shaft section abuts against the groove bottom of the fifth circular groove;
the electrode sleeve is in a stepped shaft form and sequentially comprises a fifth shaft section and a sixth shaft section from inside to outside, the diameter of the sixth shaft section is larger than that of the fifth shaft section, and a seventh circular through hole coaxial with the electrode sleeve is formed in the electrode sleeve; the electrode sleeve is sleeved on the fourth shaft section, the end face of the fifth shaft section abuts against the end face, far away from the second shaft section, of the third shaft section, and the sixth shaft section is connected with the electrode joint through a plurality of first screws;
a seventh circular groove is formed in the head of the adjusting bolt, an eighth circular through hole is formed in the bottom of the seventh circular groove, and the tail of the adjusting bolt is screwed into the sixth circular groove;
the electrode rod is in a stepped shaft form and sequentially comprises a seventh shaft section, an eighth shaft section and a ninth shaft section from inside to outside, and the diameter of the eighth shaft section is larger than that of the seventh shaft section and that of the ninth shaft section; the seventh shaft section sequentially passes through the eighth circular through hole and the sixth circular through hole and then extends into the inner cavity of the spherical reaction container, a threaded hole is formed in one end, close to the sphere center, of the seventh shaft section, and the end face, close to the seventh shaft section, of the eighth shaft section abuts against the bottom of the seventh circular groove;
the electrode tip is in a stepped shaft form and sequentially comprises a tenth shaft section, an eleventh shaft section and a twelfth shaft section from inside to outside, the diameter of the eleventh shaft section is larger than that of the tenth shaft section and that of the twelfth shaft section, an external thread is arranged on the side wall of the twelfth shaft section, the twelfth shaft section is in threaded connection with the seventh shaft section, and the tenth shaft section penetrates through a middle through hole of the insulating flange and is fixedly connected with the insulating flange;
a ninth circular through hole is formed in the middle of the nut, and the nut is screwed into the seventh circular groove after being sleeved on the ninth shaft section;
the gas distribution system comprises a vacuum pump, a pressure sensor, a temperature sensor and a gas block valve; the output end of the vacuum pump is connected with a hose, the hose is in threaded connection with the first circular groove through a threaded joint, the gas block valve is installed in the second circular through hole, an induction joint of the pressure sensor is in threaded connection with the fourth circular through hole, and the temperature sensor is arranged in an inner cavity of the spherical reaction container;
the control box comprises a high-voltage power supply, a relay and a capacitor bank, the high-voltage power supply is electrically connected with the capacitor bank through the relay, and the anode and the cathode of the capacitor bank are respectively connected with the ninth shaft sections of the two electrode rods; the output ends of the pressure sensor and the temperature sensor are electrically connected with the input end of the control box, and the vacuum pump and the gas block valve are electrically connected with the output end of the control box.
Further, the first circular groove and the second circular through hole are coaxial, the axes of the first circular groove and the second circular through hole are horizontal axes, the distance from the center of the sphere of the inner cavity of the spherical reaction part to the axis of the second circular through hole is greater than 90% R, and R is the radius of the inner cavity of the spherical reaction part.
Furthermore, the top of the spherical reaction part is provided with a tenth circular through hole and an observation assembly, and the observation assembly comprises an observation window, a window joint and a view mirror cover;
the observation window is in a shape of a round cake and is made of glass;
the window joint is cylindrical, one end of the window joint is welded inside the tenth circular through hole, an eighth circular groove is formed in the end face of the other end of the window joint, and an eleventh circular through hole is formed in the bottom of the groove in the eighth circular groove;
the sight glass cover is cylindrical, a twelfth circular through hole is formed in the upper end of the sight glass cover, a ninth circular groove with the diameter larger than that of the observation window and larger than that of the twelfth circular through hole is formed in the lower end of the sight glass cover, and the sight glass cover is connected with the window joint through a plurality of second screws;
the observation window sets up in the eighth circular recess, the lower terminal surface of observation window with be provided with first silica gel pad between the eighth circular recess, the up end of observation window with be provided with the second silica gel pad between the ninth circular recess.
Further, the support frame is I-shaped.
Further, the resistance between the two metal electrodes is more than 1012Ω。
Furthermore, the volume of the spherical reaction container is 1L, the spherical reaction container is made of stainless steel, and the insulating end is made of polytetrafluoroethylene.
Furthermore, the tenth shaft section is fixedly connected with the insulating flange through epoxy vinyl resin.
The utility model has the advantages that:
the utility model discloses can realize the test to the minimum ignition energy and the quenching distance of combustible gas, vapour or combustible gas-air mixture in a device. The utility model discloses an electric spark takes place in the system clearance of two relative metal electrodes is adjustable, can realize metal electrode's reliable centering, reduces the error of artificial centering, improves the measuring accuracy. The utility model discloses a device has the repeatability to the test result of quenching distance, and the error is less than thousandth. The utility model discloses a set up at spherical reaction vessel's top and observe the subassembly, can carry out whole journey to the inside test procedure of reaction vessel and observe.
Drawings
FIG. 1 is a front view of a gas mixture minimum ignition energy and quenching distance testing apparatus of the present invention in an embodiment;
FIG. 2 is a vertical cross-sectional view of a spherical reaction vessel in a gas mixture minimum ignition energy and quenching distance test apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a control box in the gas mixture minimum ignition energy and quenching distance testing apparatus according to the present invention in an embodiment.
In the figure, 1 — control box; 2-a spherical reaction vessel; 3, a support frame; 4-an electric spark generation system, 4-1-an electrode rod, 4-2-an electrode tip, 4-3-a nut, 4-an adjusting bolt, 4-5-an insulating end, 4-6-an electrode joint, 4-7-an electrode sleeve and 4-8-an insulating flange; 5-observation assembly, 5-1-observation window, 5-2-window joint, 5-3-view mirror cover, 5-4-first silica gel pad and 5-second silica gel pad; 6-a spherical reaction part, 6-1-a mounting edge, 6-2-an inner cavity of the spherical reaction part, 6-3-a first circular through hole; 7-a base, 7-1-a first spherical groove, 7-2-a first circular groove, 7-3-a second circular through hole, 7-4-a second circular groove, 7-5-a third circular groove, 7-6-a fourth circular groove, 7-a third circular through hole, and 7-8-a fourth circular through hole; 8-a first bolt; 9-a second bolt; 10-a first screw; 11-second screw.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, the device for testing minimum ignition energy and quenching distance of gas mixture of the utility model comprises a control box 1, a spherical reaction vessel 2, a support frame 3, an electric spark generation system 4 and a gas distribution system.
The inner cavity of the spherical reaction vessel 2 is spherical, and the spherical reaction vessel 2 comprises a spherical reaction part 6 and a base 7. The volume of the spherical reaction vessel 2 is 1L, and the material of the spherical reaction vessel 2 is stainless steel.
As shown in fig. 2, after the lower part of the spherical reaction part 6 is cut by a first horizontal plane, a mounting edge 6-1 extends outwards from the bottom of the outer side wall to form an inner cavity 6-2 of the spherical reaction part, and two first circular through holes 6-3 with axes passing through the center of sphere are symmetrically formed on two sides of the vertical section of the center of sphere of the spherical reaction part 6.
The base 7 is in a stepped shaft form, and the diameter of an upper shaft section of the base 7 is larger than that of a lower shaft section of the base 7; the upper end of the upper shaft section of the base 7 is provided with a first spherical groove 7-1 which is concentric with the inner cavity 6-2 of the spherical reaction part, the first spherical groove 7-1 and the inner cavity 6-2 of the spherical reaction part jointly form the inner cavity of the spherical reaction container 2, and the upper shaft section of the base 7 is connected with the mounting edge 6-1 through a plurality of first bolts 8; a first circular groove 7-2 is formed in the side wall of the upper shaft section of the base 7, a second circular through hole 7-3 is formed in the bottom of the first circular groove 7-2, and internal threads are formed in the inner wall of the first circular groove 7-2; the lower end of the lower shaft section of the base 7 is provided with a second circular groove 7-4, the bottom of the second circular groove 7-4 is provided with a third circular groove 7-5 and a fourth circular groove 7-6, the bottom of the third circular groove 7-5 is provided with a third circular through hole 7-7, the bottom of the fourth circular groove 7-6 is provided with a fourth circular through hole 7-8, and the inner wall of the fourth circular through hole 7-8 is provided with an internal thread.
In this embodiment, the first circular groove 7-2 and the second circular through hole 7-3 are coaxial and have horizontal axes, and the distance from the spherical center of the inner cavity 6-2 of the spherical reaction part to the axis of the second circular through hole 7-3 is greater than 90% R, so that the gas inlet direction is approximately tangent to the wall of the container, and turbulent eddies can be formed after the gas enters the container to promote gas mixing. Wherein R is the radius of the inner cavity 6-2 of the spherical reaction part.
The support frame 3 sets up the upper surface of control box 1, the upper end of support frame 3 is connected with the lower shaft part of base 7 through a plurality of second bolts 9. In this embodiment, the supporting frame 3 is i-shaped.
The electric spark generation system 4 comprises two groups of electric spark generation assemblies which are symmetrically arranged on two sides of a vertical section passing through the center of a sphere; the electric spark generation assembly comprises a metal electrode, a screw cap 4-3, an adjusting bolt 4-4, an insulating end 4-5, an electrode joint 4-6, an electrode sleeve 4-7 and an insulating flange 4-8, wherein the metal electrode comprises an electrode rod 4-1 and an electrode tip 4-2.
In this embodiment, the resistance between the two metal electrodes is greater than 1012Ω。
The electrode joint 4-6 is cylindrical, one end of the electrode joint 4-6 is welded inside the first circular through hole 6-3, a fifth circular groove is formed in the end face of the other end of the electrode joint, and a fifth circular through hole is formed in the bottom of the groove in the fifth circular groove;
the insulating end 4-5 is in a stepped shaft form and sequentially comprises a first shaft section, a second shaft section, a third shaft section and a fourth shaft section from inside to outside, the first shaft section is in a circular truncated cone shape, and the diameter of the third shaft section is larger than that of the second shaft section and that of the fourth shaft section; a sixth circular groove is formed in the end face of the outer end of each insulating end 4-5, internal threads are formed in the inner wall of each sixth circular groove, a sixth circular through hole is formed in the bottom of each groove of each sixth circular groove, the first shaft section penetrates through the fifth circular through hole, and the end face, close to the second shaft section, of the third shaft section abuts against the bottom of each fifth circular groove; the insulating end heads 4-5 are made of polytetrafluoroethylene;
the electrode sleeve 4-7 is in a stepped shaft form and sequentially comprises a fifth shaft section and a sixth shaft section from inside to outside, the diameter of the sixth shaft section is larger than that of the fifth shaft section, and a seventh circular through hole coaxial with the electrode sleeve 4-7 is formed in the electrode sleeve 4-7; the electrode sleeve 4-7 is sleeved on the fourth shaft section, the end face of the fifth shaft section is abutted against the end face of the third shaft section, which is far away from the second shaft section, and the sixth shaft section is connected with the electrode joint 4-6 through a plurality of first screws 10;
a seventh circular groove is formed in the head of the adjusting bolt 4-4, an eighth circular through hole is formed in the bottom of the seventh circular groove, and the tail of the adjusting bolt 4-4 is screwed into the sixth circular groove;
the electrode rod 4-1 is in a stepped shaft form and sequentially comprises a seventh shaft section, an eighth shaft section and a ninth shaft section from inside to outside, and the diameter of the eighth shaft section is larger than that of the seventh shaft section and that of the ninth shaft section; the seventh shaft section sequentially passes through the eighth circular through hole and the sixth circular through hole and then extends into the inner cavity of the spherical reaction vessel 2, a threaded hole is formed in one end, close to the sphere center, of the seventh shaft section, and the end face, close to the seventh shaft section, of the eighth shaft section abuts against the bottom of the seventh circular groove;
the electrode tip 4-2 is in a stepped shaft form and sequentially comprises a tenth shaft section, an eleventh shaft section and a twelfth shaft section from inside to outside, the diameter of the eleventh shaft section is larger than that of the tenth shaft section and that of the twelfth shaft section, an external thread is arranged on the side wall of the twelfth shaft section, the twelfth shaft section is in threaded connection with the seventh shaft section, and the tenth shaft section penetrates through a middle through hole of the insulating flange 4-8 and is fixedly connected with the insulating flange 4-8 through epoxy vinyl resin;
a ninth circular through hole is formed in the middle of the nut 4-3, and the nut 4-3 is screwed into the seventh circular groove after being sleeved on the ninth shaft section.
The gas distribution system comprises a vacuum pump, a pressure sensor, a temperature sensor and a gas block valve; the output end of the vacuum pump is connected with a hose, the hose is in threaded connection with the first circular groove 7-2 through a threaded connector, the gas block valve is installed in the second circular through hole 7-3, the induction connector of the pressure sensor is in threaded connection with the fourth circular through hole 7-8, and the temperature sensor is arranged in the inner cavity of the spherical reaction container 2. Temperature changes affect the pressure of the gas, and thus the ignition energy and quenching distance of the gas, at constant volume conditions, and temperature is measured using a temperature sensor to characterize the experimental conditions.
As shown in fig. 3, the control box 1 includes a high voltage power supply, a relay, and a capacitor bank, the high voltage power supply is electrically connected to the capacitor bank through the relay, and the positive electrode and the negative electrode of the capacitor bank are respectively connected to the ninth shaft segments of the two electrode rods 4-1; the output ends of the pressure sensor and the temperature sensor are electrically connected with the input end of the control box 1, and the vacuum pump and the gas block valve are electrically connected with the output end of the control box 1. Wherein, the relay is a ceramic vacuum relay, and the capacitor is a polyvinyl chloride film capacitor. The control box 1 also comprises a PLC, a touch screen, a button, an air switch, a piezoresistive sensor and a switching power supply. The capacitor bank is charged through the high-voltage power supply, then the high-voltage power supply is disconnected, the positive electrode and the negative electrode of the capacitor are directly connected with the discharge electrode, air is broken down through high voltage, electric sparks are generated, and energy of the capacitor bank is released through the electric sparks. The connection and disconnection of the high voltage power supply is controlled by a ceramic vacuum relay J1 in fig. 3.
In the embodiment, the top of the spherical reaction part 6 is provided with a tenth circular through hole, the top of the spherical reaction part is provided with an observation assembly 5, and the observation assembly 5 comprises an observation window 5-1, a window joint 5-2 and a view mirror cover 5-3;
the observation window 5-1 is in a shape of a round cake and is made of glass;
the window joint 5-2 is cylindrical, one end of the window joint 5-2 is welded inside the tenth circular through hole, the end face of the other end of the window joint is provided with an eighth circular groove, and the bottom of the groove of the eighth circular groove is provided with an eleventh circular through hole;
the sight glass cover 5-3 is cylindrical, a twelfth circular through hole is formed in the upper end of the sight glass cover 5-3, a ninth circular groove with the diameter larger than that of the observation window 5-1 and larger than that of the twelfth circular through hole is formed in the lower end of the sight glass cover 5-3, and the sight glass cover 5-3 is connected with the window joint 5-2 through a plurality of second screws 11;
the observation window 5-1 is arranged in the eighth circular groove, a first silica gel pad 5-4 is arranged between the lower end face of the observation window 5-1 and the eighth circular groove, and a second silica gel pad 5-5 is arranged between the upper end face of the observation window 5-1 and the ninth circular groove. The arrangement of the silica gel pad prevents the upper end face and the lower end face of the observation window 5-1 made of glass material from being directly contacted with the lens cover 5-3 and the window joint 5-2 to generate abrasion.
An operator can observe the whole testing process in the reaction vessel through the observation window 5-1.
The use principle of the present invention is described below with reference to the accompanying drawings:
if the operation and the test are not carried out for the first time, the upper half part of the spherical reaction vessel needs to be taken down and cleaned, the cleanness inside the reaction vessel is ensured, and then the spherical reaction vessel is well covered and sealed. And setting a preset distance of electrodes in the reaction container, determining the capacitance energy storage required by the experiment (the capacitance energy storage is related to the minimum ignition energy of the gas to be detected), and calculating a matched voltage value according to the preset energy and the capacitance.
Wherein, the capacitor stored energy E is 0.5CU2. C is a capacitance value and U is a voltage. When the minimum ignition energy is measured, the electrode distance is ensured to be capable of discharging to generate electric sparks; because the energy is very small, the electrodes cannot puncture air and cannot generate electric sparks after the electrode distance is reduced. When the quenching distance is measured, the used energy is very large and is larger than the minimum ignition energy, ignition can be guaranteed, then the electrode distance is gradually reduced, after a certain degree, flame cannot spread due to too small distance, and the electrode distance is the quenching distance.
The opening of the gas block valve is controlled through the control box 1, the vacuum pump is controlled to vacuumize the inner cavity of the spherical reaction container 2, the vacuum pump is controlled to fill gas to be detected into the inner cavity of the spherical reaction container 2 through the first circular groove 7-2 and the second circular through hole 7-3 in sequence, the pressure sensor measures the air pressure of the inner cavity of the spherical reaction container 2 and transmits pressure data to the control box 1, the filling of the gas to be detected is stopped when the air pressure of the inner cavity of the spherical reaction container 2 reaches a preset partial pressure, the vacuum pump is controlled to fill the air into the inner cavity of the spherical reaction container 2, and the gas block valve is closed when the air pressure of the inner cavity of the spherical reaction container 2 is slightly higher than the preset. Because the gas inlet direction is approximately tangent to the wall of the container, turbulent eddies are formed after the gas enters the container, and gas mixing is promoted.
The two adjusting bolts 4-4 are simultaneously turned until the gap between the two electrode tips 4-2 reaches a preset distance. And closing the relay, charging the capacitor bank through the high-voltage power supply, and disconnecting the relay when the capacitor energy storage of the capacitor bank reaches the capacitor energy storage required by the experiment, so that the capacitor bank discharges.
When the composition and the minimum ignition energy of the gas to be measured are known, the following steps are carried out:
gradually increasing the voltage, recording a critical voltage value and immediately reducing the applied voltage if electric sparks are generated between the two electrode tips 4-2, and calculating the minimum ignition energy according to the critical voltage value; if no ignition phenomenon was observed, the procedure was repeated five times. If the gas to be measured still cannot be ignited, the test was carried out with reference to the following conditions:
if the critical voltage value is consistent with the preset voltage value, gradually increasing the capacitance energy storage or the electrode gap, and repeating the test until the gas to be tested is ignited;
if the critical voltage value is not consistent with the preset voltage value, exhausting the gas in the spherical reaction vessel 2, checking the distance between the metal electrodes, removing the two insulating flanges 4-8, and restarting the test.
When the composition and the minimum ignition energy of the gas to be detected are unknown, the following steps are executed:
the preset distance does the utility model discloses a maximum electrode distance that the device can allow, the required electric capacity energy storage of experiment is the biggest energy storage.
After the capacitive energy storage is set, the electrode gap is gradually reduced to carry out an ignition test by referring to a method for measuring the gas to be measured with known components and minimum ignition energy until the quenching distance of the gas to be measured is gradually approached. When the electrode gap is larger than the ignition quenching distance, the ignition is easy to occur; but the ignition phenomenon disappears rapidly when the electrode gap is close to or equal to the quenching distance. And adjusting the electrode gap to be slightly larger than the quenching distance, and gradually reducing the capacitance stored energy to carry out an ignition test until the gas to be tested cannot be ignited by electric sparks to obtain the minimum ignition energy of the gas to be tested.
It is obvious that the above embodiments are only a part of the embodiments of the present invention, and not all of them. The above embodiments are only used for explaining the present invention, and do not constitute a limitation to the scope of the present invention. All other embodiments, which can be derived by those skilled in the art from the above-described embodiments without any creative effort, namely all modifications, equivalents, improvements and the like made within the spirit and principle of the present application, are within the protection scope of the present invention.
Claims (7)
1. A gas mixture minimum ignition energy and quenching distance testing device is characterized in that: comprises a control box (1), a spherical reaction container (2), a support frame (3), an electric spark generation system (4) and a gas distribution system;
the inner cavity of the spherical reaction container (2) is spherical, and the spherical reaction container (2) comprises a spherical reaction part (6) and a base (7);
the lower part of the spherical reaction part (6) is cut by a first horizontal plane, and then an installation edge (6-1) extends outwards from the bottom of the outer side wall to form an inner cavity (6-2) of the spherical reaction part, and two first circular through holes (6-3) with axes passing through the center of sphere are symmetrically formed in the spherical reaction part (6) on two sides of the vertical section passing through the center of sphere;
the base (7) is in a stepped shaft form, and the diameter of an upper shaft section of the base (7) is larger than that of a lower shaft section of the base (7); the upper end of the upper shaft section of the base (7) is provided with a first spherical groove (7-1) which is concentric with the inner cavity (6-2) of the spherical reaction part, the first spherical groove (7-1) and the inner cavity (6-2) of the spherical reaction part jointly form the inner cavity of the spherical reaction container (2), and the upper shaft section of the base (7) is connected with the mounting edge (6-1) through a plurality of first bolts (8); a first circular groove (7-2) is formed in the side wall of the upper shaft section of the base (7), a second circular through hole (7-3) is formed in the bottom of the first circular groove (7-2), and internal threads are formed in the inner wall of the first circular groove (7-2); a second circular groove (7-4) is formed in the lower end of the lower shaft section of the base (7), a third circular groove (7-5) and a fourth circular groove (7-6) are formed in the bottom of the second circular groove (7-4), a third circular through hole (7-7) is formed in the bottom of the third circular groove (7-5), a fourth circular through hole (7-8) is formed in the bottom of the fourth circular groove (7-6), and internal threads are formed in the inner wall of the fourth circular through hole (7-8);
the support frame (3) is arranged on the upper surface of the control box (1), and the upper end of the support frame (3) is connected with the lower shaft section of the base (7) through a plurality of second bolts (9);
the electric spark generation system (4) comprises two groups of electric spark generation assemblies which are symmetrically arranged on two sides of a vertical section passing through the center of a sphere; the electric spark generation assembly comprises a metal electrode, a screw cap (4-3), an adjusting bolt (4-4), an insulating end (4-5), an electrode joint (4-6), an electrode sleeve (4-7) and an insulating flange (4-8), wherein the metal electrode comprises an electrode rod (4-1) and an electrode tip (4-2);
the electrode joint (4-6) is cylindrical, one end of the electrode joint (4-6) is welded inside the first circular through hole (6-3), the end face of the other end of the electrode joint is provided with a fifth circular groove, and the bottom of the groove of the fifth circular groove is provided with a fifth circular through hole;
the insulating end (4-5) is in a stepped shaft form and sequentially comprises a first shaft section, a second shaft section, a third shaft section and a fourth shaft section from inside to outside, the first shaft section is in a circular truncated cone shape, and the diameter of the third shaft section is larger than that of the second shaft section and that of the fourth shaft section; a sixth circular groove is formed in the end face of the outer end of the insulating end (4-5), internal threads are formed in the inner wall of the sixth circular groove, a sixth circular through hole is formed in the bottom of the groove of the sixth circular groove, the first shaft section penetrates through the fifth circular through hole, and the end face, close to the second shaft section, of the third shaft section abuts against the bottom of the fifth circular groove;
the electrode sleeve (4-7) is in a stepped shaft form and sequentially comprises a fifth shaft section and a sixth shaft section from inside to outside, the diameter of the sixth shaft section is larger than that of the fifth shaft section, and a seventh circular through hole coaxial with the electrode sleeve (4-7) is formed in the electrode sleeve (4-7); the electrode sleeve (4-7) is sleeved on the fourth shaft section, the end face of the fifth shaft section abuts against the end face, far away from the second shaft section, of the third shaft section, and the sixth shaft section is connected with the electrode joint (4-6) through a plurality of first screws (10);
a seventh circular groove is formed in the head of the adjusting bolt (4-4), an eighth circular through hole is formed in the bottom of the seventh circular groove, and the tail of the adjusting bolt (4-4) is screwed into the sixth circular groove;
the electrode rod (4-1) is in a stepped shaft form and sequentially comprises a seventh shaft section, an eighth shaft section and a ninth shaft section from inside to outside, and the diameter of the eighth shaft section is larger than that of the seventh shaft section and that of the ninth shaft section; the seventh shaft section sequentially penetrates through an eighth circular through hole and a sixth circular through hole and then extends into the inner cavity of the spherical reaction container (2), a threaded hole is formed in one end, close to the sphere center, of the seventh shaft section, and the end face, close to the seventh shaft section, of the eighth shaft section abuts against the bottom of the seventh circular groove;
the electrode tip (4-2) is in a stepped shaft form and sequentially comprises a tenth shaft section, an eleventh shaft section and a twelfth shaft section from inside to outside, the diameter of the eleventh shaft section is larger than that of the tenth shaft section and that of the twelfth shaft section, an external thread is arranged on the side wall of the twelfth shaft section, the twelfth shaft section is in threaded connection with the seventh shaft section, and the tenth shaft section penetrates through a middle through hole of the insulating flange (4-8) and is fixedly connected with the insulating flange (4-8);
a ninth circular through hole is formed in the middle of the nut (4-3), and the nut (4-3) is sleeved on the ninth shaft section and then screwed into the seventh circular groove;
the gas distribution system comprises a vacuum pump, a pressure sensor, a temperature sensor and a gas block valve; the output end of the vacuum pump is connected with a hose, the hose is in threaded connection with the first circular groove (7-2) through a threaded joint, the gas block valve is installed in the second circular through hole (7-3), an induction joint of the pressure sensor is in threaded connection with the fourth circular through hole (7-8), and the temperature sensor is arranged in the inner cavity of the spherical reaction container (2);
the control box (1) comprises a high-voltage power supply, a relay and a capacitor bank, wherein the high-voltage power supply is electrically connected with the capacitor bank through the relay, and the anode and the cathode of the capacitor bank are respectively connected with the ninth shaft sections of the two electrode rods (4-1); the output ends of the pressure sensor and the temperature sensor are electrically connected with the input end of the control box (1), and the vacuum pump and the gas block valve are electrically connected with the output end of the control box (1).
2. The gas mixture minimum ignition energy and quenching distance test device according to claim 1, wherein the first circular groove (7-2) and the second circular through hole (7-3) are coaxial and have horizontal axes, and the distance from the spherical center of the inner cavity (6-2) of the spherical reaction part to the axis of the second circular through hole (7-3) is more than 90% R, wherein R is the radius of the inner cavity (6-2) of the spherical reaction part.
3. The gas mixture minimum ignition energy and quenching distance testing device as claimed in claim 1, wherein said spherical reaction part (6) is provided with a tenth circular through hole at the top and an observation assembly (5) at the top, said observation assembly (5) comprises an observation window (5-1), a window joint (5-2) and a view mirror cover (5-3);
the observation window (5-1) is in a shape of a round cake and is made of glass;
the window joint (5-2) is cylindrical, one end of the window joint (5-2) is welded inside the tenth circular through hole, the end face of the other end of the window joint is provided with an eighth circular groove, and the bottom of the groove of the eighth circular groove is provided with an eleventh circular through hole;
the sight glass cover (5-3) is cylindrical, a twelfth circular through hole is formed in the upper end of the sight glass cover (5-3), a ninth circular groove with the diameter larger than that of the observation window (5-1) and larger than that of the twelfth circular through hole is formed in the lower end of the sight glass cover, and the sight glass cover (5-3) is connected with the window joint (5-2) through a plurality of second screws (11);
the observing window (5-1) is arranged in the eighth circular groove, a first silica gel pad (5-4) is arranged between the lower end face of the observing window (5-1) and the eighth circular groove, and a second silica gel pad (5-5) is arranged between the upper end face of the observing window (5-1) and the ninth circular groove.
4. The gas mixture minimum ignition energy and quenching distance test device according to claim 1, wherein the support frame (3) is i-shaped.
5. The gas mixture minimum ignition energy and quenching distance test device of claim 1, wherein the resistance between two metal electrodes is greater than 1012Ω。
6. The device for testing minimum ignition energy and quenching distance of gas mixture according to claim 1, wherein the volume of the spherical reaction vessel (2) is 1L, the material of the spherical reaction vessel (2) is stainless steel, and the material of the insulated terminal (4-5) is polytetrafluoroethylene.
7. The gas mixture minimum ignition energy and quenching distance test device as claimed in claim 1, wherein said tenth shaft section is fixedly connected with said insulating flanges (4-8) by epoxy vinyl resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921741728.4U CN210834734U (en) | 2019-10-17 | 2019-10-17 | Minimum ignition energy and quenching distance testing device for gas mixture |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921741728.4U CN210834734U (en) | 2019-10-17 | 2019-10-17 | Minimum ignition energy and quenching distance testing device for gas mixture |
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| Publication Number | Publication Date |
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| CN210834734U true CN210834734U (en) | 2020-06-23 |
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|---|---|---|---|
| CN201921741728.4U Active CN210834734U (en) | 2019-10-17 | 2019-10-17 | Minimum ignition energy and quenching distance testing device for gas mixture |
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