Explosion-proof hydrogen flame ionization detector

Abstract

The utility model discloses an explosion-proof hydrogen flame ionization detector which comprises an explosion-proof shell, an ignition electrode, a collecting electrode and an electric field electrode, the explosion-proof shell comprises a detection cavity, one end of the detection cavity is provided with an air inlet, and the other end of the detection cavity is provided with an air outlet; the ignition electrode is detachably mounted on the explosion-proof shell; the collecting electrode is detachably mounted on the explosion-proof shell; the electric field electrode is detachably mounted on the explosion-proof shell; the ignition electrode, the collecting electrode and the electric field electrode are sequentially arranged from one end of the exhaust port to one end of the air inlet. The explosion-proof hydrogen flame ionization detector is small in size and light in weight, the electrode is convenient to maintain or replace after being damaged, and the use convenience is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas chromatography detection analysis device technical field, especially in kind of explosion -proof hydrogen flame ionization detector. BACKGROUND

[0002] Hydrogen flame ionization detector (abbreviation FID) is a device of industrial online gas chromatography detection and analysis, hydrogen flame ionization detector uses the flame generated by hydrogen and air combustion as energy, when organic compound enters the flame that hydrogen and oxygen burn, chemical ionization is generated under high temperature, ionization produces several orders of magnitude ions than base stream, under the directional effect of high voltage electric field, form ion flow, weak ion flow is amplified through high resistance (106~1011Ω), become the electric signal that is proportional to the quantity of entering flame organic compound, therefore, can be according to the size of signal to organic matter quantitative analysis.

[0003] In order to make hydrogen flame ionization detector meet the explosion-proof requirement of field use environment, the prior art CN214703465U discloses a flame ionization detector of explosion -proof type hydrogen, an explosion -proof cylinder is additionally designed outside the detector, can limit explosion in the device, at the same time, explosion -proof pipe is additionally arranged on the detector, is used for actively closing gas source, the defects of which are that the volume is larger, the weight is heavier, and the detector is difficult to install and maintain. In order to solve the problems of large volume and heavy weight of the double-layer explosion -proof hydrogen flame ionization detector, CN115656407A discloses a body type explosion -proof hydrogen flame ionization detector, which integrates the explosion -proof shell and the detector, and comprises a fire -resistant base, a fire -resistant device, a detection device and a hot fire head. In order to realize the fire -resistant effect, the explosion -proof detector is provided with a fire -resistant sintered mesh at the gas outlet, and the sintered mesh increases the dead volume of the gas, and increases the risk of blockage at the sintered mesh. The explosion -proof detector adopts a main and standby hot fire head, which is a vulnerable component. The patent uses colloid to seal the hot fire head and the shell, and the maintenance difficulty is large after damage. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides an explosion -proof hydrogen flame ionization detector, which is smaller in size, lighter in weight, convenient to repair or replace after electrode damage, and improves the use convenience.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] An explosion -proof hydrogen flame ionization detector, comprising:

[0007] The explosion -proof shell comprises a detection cavity, one end of the detection cavity is provided with an air inlet, and the other end is provided with an air outlet;

[0008] The ignition electrode is detachably installed on the explosion -proof shell;

[0009] a collecting electrode, detachably mounted on the explosion-proof shell;

[0010] an electric field electrode, detachably mounted on the explosion-proof shell;

[0011] the ignition electrode, the collecting electrode and the electric field electrode are arranged in sequence from one end of the exhaust port to one end of the air inlet.

[0012] Optionally, a fire blocking structure is arranged at the position of the exhaust port, and the fire blocking structure is limited to the end of the explosion-proof shell by the explosion-proof back cover.

[0013] Optionally, the explosion-proof back cover is threadedly connected to the end of the explosion-proof shell.

[0014] The fire blocking structure is a fire blocking sintered mesh.

[0015] Optionally, a collecting cylinder is arranged in the detection cavity, and the collecting cylinder is provided with a collecting cavity in communication with the air inlet and the exhaust port in the axial direction, and the collecting end of the collecting electrode is in contact with the outer surface of the collecting cylinder through a collecting electrode spring.

[0016] Optionally, a limiting ring groove is arranged at the position corresponding to the collecting end of the collecting electrode on the outer surface of the collecting cylinder, one end of the collecting electrode spring is fixedly connected to the collecting end of the collecting electrode, and the other end is in contact with the limiting ring groove.

[0017] Optionally, an electric field electrode spring is connected to the metal probe of the electric field electrode, and the electric field electrode spring is in contact with a nozzle arranged in the detection cavity.

[0018] Optionally, the nozzle is connected to a uniform gas seat, the uniform gas seat is connected to a fire blocking base, the fire blocking base is detachably connected to the position of the air inlet, and the fire blocking base is used for plugging the air inlet.

[0019] Optionally, the uniform gas seat is provided with a first air inlet hole and a first sample gas inlet hole, the first sample gas inlet hole is in communication with the nozzle, the fire blocking base is provided with a second air inlet hole and a second sample gas inlet hole, the first air inlet hole and the second air inlet hole are arranged correspondingly, and the first sample gas inlet hole and the second sample gas inlet hole are arranged correspondingly.

[0020] The nozzle is connected to the air outlet end of the first sample gas inlet hole.

[0021] Optionally, the first sample gas inlet hole is arranged at the central position of the uniform gas seat.

[0022] The first air inlet hole is provided with a plurality of first air inlet holes, and the plurality of first air inlet holes are uniformly distributed around the first sample gas inlet hole.

[0023] Optionally, the air distribution seat is clamped to the fire resistance base;

[0024] The second air inlet hole is communicated with an air inlet pipeline, and the second sample gas inlet hole is communicated with a sample gas inlet pipeline, and the lengths of the air inlet pipeline and the sample gas inlet pipeline are not less than 80 cm.

[0025] From the above technical solution, it can be seen that the explosion-proof hydrogen flame ionization detector provided by the utility model adopts an explosion-proof shell, the ignition electrode, the collection electrode and the electric field electrode can be detachably installed on the explosion-proof shell, so that the ignition electrode, the collection electrode or the electric field electrode can be individually detached, and the damaged electrode can be repaired or replaced. The explosion-proof hydrogen flame ionization detector is small in size and light in weight, and is convenient to repair or replace after the electrode is damaged. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0027] Figure 1 The cross-sectional structure schematic view of the explosion-proof hydrogen flame ionization detector provided by the embodiment of the utility model is shown in the figure.

[0028] Figure 2 The cross-sectional structure schematic view of the explosion-proof hydrogen flame ionization detector provided by the embodiment of the utility model is shown in the figure. Figure 1 The cross-sectional structure schematic view of the explosion-proof hydrogen flame ionization detector provided by the embodiment of the utility model is shown in the figure.

[0029] Figure 3 The cross-sectional structure schematic view of the explosion-proof hydrogen flame ionization detector provided by the embodiment of the utility model is shown in the figure.

[0030] Figure 4 The cross-sectional structure schematic view of the explosion-proof hydrogen flame ionization detector provided by the embodiment of the utility model is shown in the figure.

[0031] Figure 5 The cross-sectional structure schematic view of the explosion-proof hydrogen flame ionization detector provided by the embodiment of the utility model is shown in the figure.

[0032] Figure 6 The cross-sectional structure schematic view of the explosion-proof hydrogen flame ionization detector provided by the embodiment of the utility model is shown in the figure.

[0033] Figure 7 The cross-sectional structure schematic view of the explosion-proof hydrogen flame ionization detector provided by the embodiment of the utility model is shown in the figure.

[0034] Figure 8 The cross-sectional structure schematic view of the explosion-proof hydrogen flame ionization detector provided by the embodiment of the utility model is shown in the figure.

[0035] Figure 9 A structural schematic view of one angle of the fire resistance base provided by the embodiment of the utility model;

[0036] Figure 10 A structural schematic view of another angle of the fire resistance base provided by the embodiment of the utility model.

[0037] Among them:

[0038] 1. explosion-proof housing,

[0039] 101. detection cavity,

[0040] 2. insulating ring,

[0041] 3. first sealing ring,

[0042] 4. explosion-proof rear cover,

[0043] 401. exhaust hole,

[0044] 5. fire resistance sintered mesh,

[0045] 6. limiting sleeve,

[0046] 7. ignition electrode,

[0047] 8. collecting electrode,

[0048] 9. electric field electrode,

[0049] 10. connecting block,

[0050] 11. air uniformizing seat,

[0051] 1101. seat body, 1102. threaded connecting hole, 1103. first air inlet hole, 1104. first sample gas inlet hole, 1105. connecting head end,

[0052] 12. fire resistance base,

[0053] 1201. connecting end hole, 1202. second air inlet hole, 1203. second sample gas inlet hole,

[0054] 13. air inlet pipeline,

[0055] 14. sample gas inlet pipeline,

[0056] 15. second sealing ring,

[0057] 16. nozzle,

[0058] 17. collecting cylinder,

[0059] 1701. limiting ring groove, 1702. collecting cavity,

[0060] 18, collecting electrode spring,

[0061] 19, electric field electrode spring. DETAILED DESCRIPTION

[0062] The utility model discloses a kind of explosion-proof hydrogen flame ionization detectors, smaller volume, lighter, electrode is damaged to facilitate maintenance or replacement, improve the convenience of use.

[0063] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0064] Referring to Figures 1 to 10 The utility model discloses an explosion-proof hydrogen flame ionization detector, including explosion -proof casing 1, ignition electrode 7, collecting electrode 8 and electric field electrode 9, explosion -proof casing 1 includes detection cavity 101, one end of detection cavity 101 is provided with air inlet, the other end is provided with exhaust port, and detection cavity 101 extends along the axial direction of explosion -proof casing 1 and is provided. Ignition electrode 7, collecting electrode 8 and electric field electrode 9 can be detachably installed on explosion -proof casing 1, and ignition electrode 7, collecting electrode 8 and electric field electrode 9 are sequentially arranged from one end of the exhaust port to one end of the air inlet.

[0065] Among them, ignition wire is connected on ignition electrode 7, for ignition to ignite the sample gas gas in detection cavity 101, so that sample gas is in combustion state. Collecting electrode 8 is used to obtain electrical signal, and electric field electrode 9 is used to provide bias voltage. Ignition electrode 7, collecting electrode 8 and electric field electrode 9 can be screwed on explosion -proof casing 1.

[0066] The utility model discloses an explosion-proof hydrogen flame ionization detector, its shell adopts explosion -proof casing 1, ignition electrode 7, collecting electrode 8 and electric field electrode 9 can be detachably installed on explosion -proof casing 1, so that the separate dismounting of ignition electrode 7, collecting electrode 8 or electric field electrode 9 can be realized, so as to maintain or replace damaged electrode. The utility model discloses an explosion-proof hydrogen flame ionization detector, smaller volume, lighter, electrode is damaged to facilitate maintenance or replacement.

[0067] In order to improve the safety performance, the exhaust port position is provided with a fire barrier structure, which is limited by the explosion-proof rear cover 4 at the end of the explosion-proof shell 1, for preventing the burning flame from being ejected from the exhaust port. The explosion-proof rear cover 4 is provided with an exhaust hole 401 communicating with the detection cavity 101, which is used for exhausting gas. In order to improve the sealing performance, the end of the explosion-proof rear cover 4 in contact with the explosion-proof shell 1 is provided with a first sealing ring 3.

[0068] In order to facilitate the replacement or maintenance of the fire barrier structure, the explosion-proof rear cover 4 is threadedly connected to the end of the explosion-proof shell 1. Specifically, the fire barrier structure is a fire barrier sintered mesh 5. In an embodiment, the fire barrier sintered mesh 5 is a 60-mesh filter mesh.

[0069] Specifically, the detection cavity 101 is provided with a collection cylinder 17. The collection cylinder 17 is provided with a collection cavity 1702 communicating with the air inlet and the air outlet in the axial direction, as shown in Figure 3 and Figure 4 The collection end of the collection electrode 8 is in contact with the outer surface of the collection cylinder 17 through the collection electrode spring 18. The collection cylinder 17 is insulated and supported in the detection cavity 101 by the insulating ring 2 sleeved on the end. It can be understood that, in order to improve the reliability of the support, two insulating rings 2 are provided, and the two insulating rings 2 are respectively arranged at the two ends of the collection cylinder 17. One end of the insulating ring 2 is limited by the boss on the inner surface of the detection cavity 101, and the other end of the insulating ring 2 is limited by the limiting sleeve 6. In order to avoid affecting the installation of the ignition electrode 7, the limiting sleeve 6 is provided with a through hole for the ignition electrode 7 to pass through. By providing the collection electrode spring 18, the collection end of the collection electrode 8 can always be in contact with the outer surface of the collection cylinder 17, which facilitates the accurate transmission of the collected signal. By setting the collection end of the collection electrode 8 as a flexible end with a telescopic length, the problem of poor contact or inability to install caused by the size deviation of the collection end of the different collection electrodes 8 can be solved, and the reliable signal transmission of the replaced collection end of the collection electrode 8 can be ensured. The collection electrode spring 18 can be welded to the collection end of the collection electrode 8.

[0070] In order to improve the reliability of the contact, the outer surface of the collection cylinder 17 is provided with a limiting ring groove 1701 corresponding to the position of the collection end of the collection electrode 8, as shown in Figure 3 and Figure 4 The collection electrode spring 18 is fixedly connected to one end of the collection end of the collection electrode 8, and the other end is in contact with the limiting ring groove 1701. The collection electrode 8 is pressed from SMA cable, copper pipe and insulating sleeve. The ignition electrode 7 and the electric field electrode 9 are pressed from high-temperature-resistant cable, copper pipe and insulating sleeve, and the ignition electrode 7 is connected with the ignition wire. The insulating sleeves of the electrodes are threadedly connected with the explosion-proof shell 1.

[0071] In order to ensure that the metal probe of the electric field electrode 9 can reliably transmit signals, the metal probe of the electric field electrode 9 is connected with an electric field electrode spring 19, and the electric field electrode spring 19 is in contact with the nozzle 16 arranged in the detection cavity 101. By arranging the electric field electrode spring 19, the end of the electric field electrode spring 19 can always be in contact with the nozzle 16, which facilitates accurate transmission of the collected signals of the nozzle 16. By arranging the end of the electric field electrode 9 as a telescopic spring structure, the end of the metal probe of the electric field electrode 9 is arranged as a flexible end with a telescopic length, which can solve the problem of poor contact with the nozzle 16 or inability to install caused by the length deviation of the electric field electrode 9. The electric field electrode spring 19 is welded to the end of the electric field electrode 9.

[0072] In an embodiment, the nozzle 16 is connected to the air uniformizing seat 11 through the connecting block 10, the air uniformizing seat 11 is connected to the fireproof base 12, and the fireproof base 12 is detachably connected to the air inlet position of the explosion-proof shell 1 and is used for plugging the air inlet. Specifically, the nozzle 16 is fixedly connected to one end of the connecting block 10 close to the detection cavity 101, and the other end of the connecting block 10 is threadedly connected to the threaded connection hole 1102 of the air uniformizing seat 11.

[0073] Further, the air uniformizing seat 11 comprises a seat body 1101, the seat body 1101 is provided with a first air inlet hole 1103 and a first sample gas inlet hole 1104, the first sample gas inlet hole 1104 is in communication with the threaded connection hole 1102, so that the first sample gas inlet hole 1104 is in communication with the nozzle 16 to provide airflow for the nozzle 16. The first air inlet hole 1103 and the first sample gas inlet hole 1104 are arranged in parallel to the axis of the seat body 1101, as shown in Figures 5 to 7 The fireproof base 12 is provided with a second air inlet hole 1202 and a second sample gas inlet hole 1203, as shown in Figures 8 to 10 The first air inlet hole 1103 and the second air inlet hole 1202 are correspondingly arranged, thereby forming a communication air inlet hole channel. The first sample gas inlet hole 1104 and the second sample gas inlet hole 1203 are correspondingly arranged, thereby forming a communication sample gas inlet hole channel. The nozzle 16 is connected to the air outlet end of the first sample gas inlet hole 1104, i.e. the end of the first sample gas inlet hole 1104 away from the fireproof base 12. The end of the second air inlet hole 1202 away from the air uniformizing seat 11 is connected with an air inlet pipeline 13, and the end of the second sample gas inlet hole 1203 away from the air uniformizing seat 11 is connected with a sample gas inlet pipeline 14. The lengths of the air inlet pipeline 13 and the sample gas inlet pipeline 14 are not less than 80 cm. Preferably, the lengths of the air inlet pipeline 13 and the sample gas inlet pipeline 14 are 1 m, so that the burning flame is far away from the gas storage device, and the safety of use is improved. The fireproof base 12 is made of steel.

[0074] In order to improve the sealing performance of the contact position between the flame arrester base 12 and the explosion-proof housing 1, the contact end of the flame arrester base 12 and the explosion-proof housing 1 is provided with a second sealing ring 15.

[0075] In an embodiment, the first sample gas inlet hole 1104 is arranged at the center position of the air uniformizing seat 11, and the first air inlet hole 1103 is arranged at the edge position. In order to facilitate the control of the air flow rate and avoid the influence of the turbulent air flow on the shape of the flame, the first air inlet hole 1103 is provided with a plurality of first air inlet holes 1103, and the plurality of first air inlet holes 1103 are uniformly distributed around the first sample gas inlet hole 1104. As shown in the figure, Figure 6 and Figure 7 As shown in the figure, the first air inlet hole 1103 is provided with four first air inlet holes 1103. The air uniformizing seat 11 is made of high-temperature-resistant insulating material, which can be PTFE material or PEEK material.

[0076] The air uniformizing seat 11 is clamped on the flame arrester base 12. Specifically, the end of the flame arrester base 12 close to the air uniformizing seat 11 is provided with a connecting end hole 1201, and the end of the air uniformizing seat 11 close to the flame arrester base 12 is provided with a connecting head end 1105, and the connecting head end 1105 is clamped in the connecting end hole 1201. In order to improve the reliability of the plug-in connection, the cross section of the connecting end hole 1201 is rectangular or square, and correspondingly, the cross section of the connecting head end 1105 is rectangular or square, so as to avoid the relative rotation of the two plug-in connections.

[0077] The explosion-proof hydrogen flame ionization detector of the utility model sets up the collecting electrode 8, the electric field electrode 9 and the ignition electrode 7 as detachable structure, and each electrode is connected through screw thread with the explosion-proof housing 1, thereby facilitating the individual replacement of the fault electrode when the electrode appears working fault. The electric field electrode 9 is contacted with the nozzle 16 by using the electric field spring 19, and the collecting electrode 8 is contacted with the collecting cylinder 17 by using the collecting spring 18, which is used for ensuring the working reliability of the collecting electrode 8 and the electric field electrode 9 after replacement, ensuring the contact with the corresponding structure, and enabling flexible installation and dismounting without damaging the detector structure. The explosion-proof hydrogen flame ionization detector of the utility model can be replaced in parts, reduces the processing difficulty, and improves the use convenience.

[0078] The explosion-proof hydrogen flame ionization detector of the utility model works, direct current high voltage is applied by electric field electrode 9, so that collecting cylinder 17 and nozzle 16 form about 200V pressure difference.Hydrogen is introduced into detection cavity 101 through sample gas inlet pipeline 14, air is introduced into detection cavity 101 through air inlet pipeline 13, after mixed gas fills in detection cavity 101, ignition mode is started.Direct current is introduced into ignition electrode 7, ignition wire generates heat and ignites hydrogen air mixture, produces explosion sound, and water vapor can be detected at exhaust port, at this time, it is confirmed that flame is ignited.After flame is ignited, hydrogen continuously enters combustion chamber from nozzle 16, air enters from air inlet pipeline 13, air is shunted into multiple air inlet streams from multiple first air inlet holes 1103 on air uniform seat 11, so that the flow rate of air is slowed down, the flow rate of hydrogen and air is about 1:10, at this time, flame stably burns at nozzle 16.Stable flame combustion produces stable ion flow, under the action of electric field, hits collecting cylinder 17, current signal is transmitted to sampling board card through SMA cable.After entering analysis process, a small amount of sample gas separated by chromatographic column is mixed with hydrogen and introduced into combustion chamber, hydrocarbon substances in sample gas produce ionization in hydrogen flame, the number of ion flow produced by ionization is proportional to the concentration of hydrocarbon substances, under the action of electric field, ion flow hits collecting cylinder 17, after sampling and conversion, corresponding peak value is formed.

[0079] In the description of the present scheme, it should be understood that the terms "upper", "lower", "vertical", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present scheme.

[0080] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present scheme, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0081] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between various embodiments can be referred to each other.

[0082] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An explosion-proof hydrogen flame ionization detector characterized by comprising: The application relates to an explosion-proof shell, which comprises a detection cavity, an air inlet arranged at one end of the detection cavity, and an air outlet arranged at the other end of the detection cavity. An ignition electrode is detachably arranged on the explosion-proof shell. A collection electrode is detachably arranged on the explosion-proof shell. An electric field electrode is detachably arranged on the explosion-proof shell. The ignition electrode, the collection electrode and the electric field electrode are arranged in sequence from the air outlet end to the air inlet end. A fireproof structure is arranged at the air outlet position, and the fireproof structure is limited to the end of the explosion-proof shell by an explosion-proof back cover.

2. The explosion-proof hydrogen flame ionization detector of claim 1, wherein, The explosion-proof back cover is screw-connected to the end of the explosion-proof shell.

3. The explosion-proof hydrogen flame ionization detector of claim 2, wherein, The fireproof structure is a fireproof sintered mesh. A collection cylinder is arranged in the detection cavity, the collection cylinder is axially provided with a collection cavity which is communicated with the air inlet and the air outlet, and the collection end of the collection electrode is in contact with the outer surface of the collection cylinder through a collection electrode spring.

4. The explosion-proof hydrogen flame ionization detector of claim 1, wherein, The outer surface of the collection cylinder is provided with a limiting ring groove at a position corresponding to the collection end of the collection electrode, one end of the collection electrode spring is fixedly connected to the collection end of the collection electrode, and the other end of the collection electrode spring is in contact with the limiting ring groove.

5. The explosion-proof hydrogen flame ionization detector of claim 4, wherein, An electric field electrode spring is connected to the metal probe of the electric field electrode, and the electric field electrode spring is in contact with a nozzle arranged in the detection cavity.

6. The explosion-proof hydrogen flame ionization detector of claim 1, wherein, The nozzle is connected to a uniform air seat, the uniform air seat is connected to a fireproof base, the fireproof base is detachably connected to the air inlet position, and the fireproof base is used for plugging the air inlet.

7. The explosion-proof hydrogen flame ionization detector of claim 6, wherein, The uniform air seat is provided with a first air inlet hole and a first sample gas inlet hole, the first sample gas inlet hole is communicated with the nozzle, the fireproof base is provided with a second air inlet hole and a second sample gas inlet hole, the first air inlet hole and the second air inlet hole are arranged correspondingly, and the first sample gas inlet hole and the second sample gas inlet hole are arranged correspondingly.

8. The explosion-proof hydrogen flame ionization detector of claim 7, wherein, The nozzle is connected to the air outlet end of the first sample gas inlet hole. The first sample gas inlet hole is arranged at the central position of the uniform air seat.

9. The explosion-proof hydrogen flame ionization detector of claim 8, wherein, The first air inlet hole is provided with a plurality of first air inlet holes, and the plurality of first air inlet holes are uniformly distributed around the first sample gas inlet hole. The uniform air seat is clamped to the fireproof base.

10. The explosion-proof hydrogen flame ionization detector of claim 8, wherein, The second air inlet hole is communicated with an air inlet pipeline, the second sample gas inlet hole is communicated with a sample gas inlet pipeline, and the lengths of the air inlet pipeline and the sample gas inlet pipeline are not less than 80 cm. ​

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