Hydrogen flame ionization detector

Abstract

The utility model discloses a hydrogen flame ionization detector relates to hydrogen flame ionization detection technical field, including base, explosion-proof tank and observation window, said explosion-proof tank is fixedly connected to base top, explosion-proof tank and base interior form sealed structure, and explosion-proof tank top is provided with vent hole, the observation window is provided with the vent hole. The top of the base is fixedly connected with an ignition electrode. According to the hydrogen flame ionization detector, gas in the explosion-proof tank is mixed gas mainly containing hydrogen, so that when the mixed gas in the explosion-proof tank is deflagrated, the pressure in the explosion-proof tank is sharply increased, and at the moment, high-pressure gas in the explosion-proof tank is sprayed out from an exhaust hole in the top of the explosion-proof tank; at the moment, the ejected high-pressure gas can apply upward force to the piston, so that the piston drives the pressing spring to deform until the piston is completely separated from the exhaust hole in the top of the anti-explosion tank, and the exhaust hole in the top of the anti-explosion tank is completely in an open state, so that the release speed of the air pressure in the anti-explosion tank is increased, and the anti-explosion tank is prevented from exploding.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen flame ionization detection, in particular to a hydrogen flame ionization detector. Background Technique

[0002] A hydrogen flame ionization detector is a detector commonly used in gas chromatography analysis. It uses hydrogen as fuel to generate ions in the flame produced by the combustion of hydrogen to detect organic compounds in the sample.

[0003] During the use of the existing hydrogen flame ionization detector, its internal detection effect is achieved through the combustion of hydrogen. Since the existing hydrogen flame ionization detector generally has a weak explosion-proof effect, and hydrogen will have a deflagration reaction at a certain concentration, the safety factor of the hydrogen flame ionization detector is relatively low.

[0004] The prior art (Chinese patent with application number: CN212845221U, application date: April 26, 2020) discloses an explosion-proof hydrogen flame ionization detector for an industrial process chromatograph. Its explosion-proof shell of the explosion-proof hydrogen flame ionization detector is fixedly installed through fixing bolts, and the hydrogen flame ionization detector module is fixedly installed inside the explosion-proof shell through a fixing bracket, so that the hydrogen flame ionization detector module is located inside the explosion-proof shell, which can effectively prevent explosion and separation, and can effectively avoid explosion and improve the safety factor.

[0005] The prior art realizes the explosion-proof effect on the hydrogen flame ionization detector by strengthening the price of the hydrogen flame ionization detector. In the actual use process, when the hydrogen flame ionization detector is explosion-proof only through structural reinforcement, it is difficult to relieve the pressure inside the hydrogen flame ionization detector in time after the hydrogen deflagration, and the failure to cut off the hydrogen supply easily leads to secondary deflagration. Content of the Utility Model

[0006] The purpose of the utility model is to provide a hydrogen flame ionization detector to solve the problems in the above background technique that it is difficult to relieve the pressure inside the hydrogen flame ionization detector in time after the hydrogen deflagration, and the failure to cut off the hydrogen supply easily leads to secondary deflagration.

[0007] To achieve the above purpose, the utility model provides the following technical solution: A hydrogen flame ionization detector, including a base, an explosion-proof tank and an observation window. The explosion-proof tank is fixedly connected to the top of the base, and a sealed structure is formed inside the explosion-proof tank and the base. And an exhaust hole is provided at the top of the explosion-proof tank. The ignition electrode is fixedly connected to the top of the base, and the collecting electrode is fixedly connected to the inner side of the top of the explosion-proof tank;

[0008] One side of the explosion-proof tank is provided with an observation window, and a pressure relief cylinder is fixedly connected to the top of the explosion-proof tank. The outer side of the pressure relief cylinder is of a hollow structure, and a sliding rod is fixedly connected to the middle inside the pressure relief cylinder. A piston is slidably connected to the outer side of the sliding rod, and the bottom of the piston is aligned with the top of the explosion-proof tank. A compression spring is fixedly connected between the top of the piston and the inner side of the top of the pressure relief cylinder, and the compression spring is located outside the sliding rod.

[0009] Preferably, an air pipe is provided at an eccentric position inside the base, and the air pipe communicates the inside of the base with the outside. A sliding hole is provided in the middle inside the base, and the sliding hole does not interfere with the air pipe.

[0010] Preferably, a moving block is slidably connected inside the sliding hole in the middle of the base. A nozzle is fixedly connected to the top of the moving block, and the nozzle is provided with a hollow structure. Sliders are fixedly connected to both sides of the moving block, and chutes for slidably connecting with the blocks on both sides of the moving block are provided on both sides inside the sliding hole of the base.

[0011] Preferably, a conduit is fixedly connected to the bottom of the nozzle. A card slot matching the conduit is provided inside the moving block, and the conduit is fixed inside the moving block through the card slot inside the moving block. The nozzle is located inside the ignition electrode, and the top of the nozzle is flush with the top of the ignition electrode.

[0012] Preferably, the conduit extends inside the moving block in a direction perpendicular to the nozzle, and one end of the moving block away from the nozzle extends to the inner wall of the sliding hole inside the base. A double-pass pipe is fixedly connected inside the base, and one end of the double-pass pipe close to the middle of the base is aligned with the conduit, and the inside of the double-pass pipe and the conduit is communicated.

[0013] Preferably, positioning grooves are provided on the sliders on both sides of the moving block, and two symmetrically distributed installation grooves are provided inside the base. A positioning block is slidably connected inside each installation groove. A spring is fixedly connected between the side of the positioning block away from the center of the base and the installation groove, and one end of the positioning block close to the center of the base is matched with the positioning groove.

[0014] Preferably, a support box is fixedly connected to the top of the base, a support spring is fixedly connected to the middle inside the support box, and one end of the support spring away from the support box is fixedly connected to the bottom of the moving block.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] This hydrogen flame ionization detector has a mixed gas mainly composed of hydrogen inside the explosion-proof tank. When the mixed gas inside the explosion-proof tank explodes and burns, the pressure inside the explosion-proof tank will increase sharply. At this time, the high-pressure gas inside will spray out from the exhaust hole at the top of the explosion-proof tank. The high-pressure gas ejected at this time will exert an upward force on the piston, causing the piston to drive the downward pressure spring to deform until the piston is completely separated from the exhaust hole at the top of the explosion-proof tank. At this time, the exhaust hole at the top of the explosion-proof tank will be completely open, thereby increasing the speed of air pressure release inside the explosion-proof tank and preventing the explosion-proof tank from exploding.

[0017] Furthermore, when the mixed gas inside the explosion-proof tank explodes and burns to generate high-pressure gas, the high-pressure environment inside the explosion-proof tank will drive the moving block to move downward, causing the moving block to drive the support spring to deform. During the downward movement of the moving block, the bottom of the moving block will contact the positioning block, causing the moving block to drive the positioning block to slide away from the center of the base until the positioning block is engaged with the inside of the positioning groove. When the positioning block is engaged with the positioning groove, the entire moving block will be located inside the conduit. At the same time, the moving block will cause a dislocation between the conduit and the double-pass pipe, preventing the hydrogen inside the double-pass pipe from entering the explosion-proof tank through the conduit, cutting off the hydrogen supply inside the explosion-proof tank, preventing secondary deflagration that is likely to occur when the hydrogen deflagration does not cut off the hydrogen supply, and improving the safety of the hydrogen flame ionization detector. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0019] Figure 2 is a sectional structural schematic diagram of the explosion-proof tank of the present utility model;

[0020] Figure 3 is the present utility model Figure 2 partial enlarged structural schematic diagram;

[0021] Figure 4 is a sectional structural schematic diagram of the base of the present utility model;

[0022] Figure 5 is a sectional structural schematic diagram of the moving block of the present utility model;

[0023] Figure 6 is a sectional structural schematic diagram of the support box of the present utility model.

[0024] In the figure: 1, base; 2, explosion-proof tank; 3, observation window; 4, pressure relief cylinder; 5, sliding rod; 6, piston; 7, downward pressure spring; 8, air pipe; 9, moving block; 10, nozzle; 11, conduit; 12, double-pass pipe; 13, positioning groove; 14, installation groove; 15, positioning block; 16, support box; 17, support spring; 18, ignition electrode; 19, collecting electrode. Detailed implementation mode

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment 1:

[0026] Please refer to Figure 1 - Figure 6 The present invention provides the following technical solutions:

[0027] A hydrogen flame ionization detector includes a base 1, an explosion-proof tank 2 and an observation window 3. The explosion-proof tank 2 is fixedly connected to the top of the base 1, and a sealed structure is formed inside the explosion-proof tank 2 and the base 1. An exhaust hole is provided at the top of the explosion-proof tank 2. An ignition electrode 18 is fixedly connected to the top of the base 1, and a collecting electrode 19 is fixedly connected to the inner side of the top of the explosion-proof tank 2;

[0028] An observation window 3 is provided on one side of the explosion-proof tank 2, and a pressure relief cylinder 4 is fixedly connected to the top of the explosion-proof tank 2. The outer side of the pressure relief cylinder 4 is in a hollow structure. A slide rod 5 is fixedly connected to the middle inside the pressure relief cylinder 4. A piston 6 is slidably connected to the outer side of the slide rod 5, and the bottom of the piston 6 is aligned with the top of the explosion-proof tank 2. A compression spring 7 is fixedly connected between the top of the piston 6 and the inner side of the top of the pressure relief cylinder 4, and the compression spring 7 is located outside the slide rod 5.

[0029] An air pipe 8 is provided at an eccentric position inside the base 1, and the air pipe 8 communicates the inside of the base 1 with the outside. A slide hole is provided in the middle inside the base 1, and the slide hole does not interfere with the air pipe 8.

[0030] A moving block 9 is slidably connected to the slide hole in the middle inside the base 1. A nozzle 10 is fixedly connected to the top of the moving block 9, and the nozzle 10 is provided in a hollow structure. Sliders are fixedly connected to both sides of the moving block 9, and chutes for slidably connecting with the blocks on both sides of the moving block 9 are provided on both sides inside the slide hole of the base 1.

[0031] A conduit 11 is fixedly connected to the bottom of the nozzle 10. A card slot matching the conduit 11 is provided inside the moving block 9, and the conduit 11 is fixed inside the moving block 9 through the card slot inside the moving block 9. The nozzle 10 is located inside the ignition electrode 18, and the top of the nozzle 10 is flush with the top of the ignition electrode 18.

[0032] The conduit 11 extends inside the moving block 9 in a direction perpendicular to the nozzle 10, and one end of the moving block 9 away from the nozzle 10 extends to the inner wall of the sliding hole inside the base 1. A double-pass pipe 12 is fixedly connected inside the base 1, and one end of the double-pass pipe 12 close to the middle of the base 1 is aligned with the conduit 11, and the inside of the double-pass pipe 12 and the conduit 11 are in communication.

[0033] Positioning grooves 13 are provided on the sliders on both sides of the moving block 9, and two symmetrically distributed mounting grooves 14 are provided inside the base 1. A positioning block 15 is slidably connected inside each mounting groove 14. A spring is fixedly connected between the side of the positioning block 15 away from the center of the base 1 and the mounting groove 14, and one end of the positioning block 15 close to the center of the base 1 matches the positioning groove 13.

[0034] The top of the base 1 is fixedly connected with a support box 16, and a support spring 17 is fixedly connected in the middle inside the support box 16. One end of the support spring 17 away from the support box 16 is fixedly connected to the bottom of the moving block 9. Embodiment Two:

[0035] On the basis of Embodiment One, its specific working principle is as follows:

[0036] For this hydrogen flame ionization detector, first, air is introduced into the explosion-proof tank 2 through the air pipe 8. The double-pass pipe 12 has two input ends. Hydrogen, carrier gas, and sample are respectively added into the explosion-proof tank 2 from the two input ends of the double-pass pipe 12, so that the mixed gas is ejected from the top of the nozzle 10 after passing through the conduit 11. At this time, the mixed gas ejected from the top of the nozzle 10 is ignited by the ignition electrode 18. When the sample enters the flame, the organic molecules in the sample will be ionized at high temperature to generate positive ions and electrons. These ions and electrons move upward and are collected by the collecting electrode 19 to generate an electric current. The intensity of the electric current is proportional to the concentration of the organic matter in the sample. The change of the electric current is represented in the form of a graph, so as to analyze the composition of the sample;

[0037] An exhaust hole is provided at the top of the explosion-proof tank 2. The piston 6 incompletely blocks the exhaust hole at the top of the explosion-proof tank 2, and the exhaust hole at the top of the explosion-proof tank 2 is always in a communicating state. When the waste gas generated after the mixed gas in the explosion-proof tank 2 burns will be discharged out of the device through the exhaust hole at the top of the explosion-proof tank 2. At this time, the size of the reserved opening of the explosion-proof tank 2 meets the exhaust requirements of the hydrogen flame ionization detector during the detection process;

[0038] Since the gas inside the explosion-proof tank 2 is a mixed gas mainly composed of hydrogen, when the mixed gas inside the explosion-proof tank 2 explodes and burns, the pressure inside the explosion-proof tank 2 will increase sharply. At this time, the high-pressure gas inside will be ejected from the exhaust hole at the top of the explosion-proof tank 2. The ejected high-pressure gas will exert an upward force on the piston 6, causing the piston 6 to drive the downward pressure spring 7 to deform until the piston 6 is completely separated from the exhaust hole at the top of the explosion-proof tank 2. At this time, the exhaust hole at the top of the explosion-proof tank 2 will be completely open, thereby increasing the speed of air pressure release inside the explosion-proof tank 2 and preventing the explosion-proof tank 2 from exploding.

[0039] When the mixed gas inside the explosion-proof tank 2 explodes and burns to generate high-pressure gas, the high-pressure environment inside the explosion-proof tank 2 will drive the moving block 9 to move downward, causing the moving block 9 to drive the support spring 17 to deform. During the downward movement of the moving block 9, the bottom of the moving block 9 will contact the positioning block 15, causing the moving block 9 to drive the positioning block 15 to slide away from the center of the base 1 until the positioning block 15 is engaged with the inside of the positioning groove 13. When the positioning block 15 is engaged with the positioning groove 13, the entire moving block 9 will be located inside the conduit 11. At the same time, the moving block 9 will cause a dislocation between the conduit 11 and the double-pass pipe 12, preventing the hydrogen inside the double-pass pipe 12 from entering the explosion-proof tank 2 through the conduit 11, cutting off the hydrogen supply inside the explosion-proof tank 2, preventing secondary explosion that is likely to occur when the hydrogen explosion and combustion do not cut off the hydrogen supply, and improving the safety of the hydrogen flame ionization detector.

[0040] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hydrogen flame ionization detector, comprising a base (1), an explosion-proof tank (2) and an observation window (3), wherein the explosion-proof tank (2) is fixedly connected to the top of the base (1), and the inside of the explosion-proof tank (2) and the base (1) form a sealed structure, and an exhaust hole is provided on the top of the explosion-proof tank (2), an ignition electrode (18) is fixedly connected to the top of the base (1), and a collecting electrode (19) is fixedly connected to the inner side of the top of the explosion-proof tank (2); Features: An observation window (3) is provided on one side of the explosion-proof tank (2), and a pressure relief cylinder (4) is fixedly connected to the top of the explosion-proof tank (2), the outer side of the pressure relief cylinder (4) is a hollow structure, and a slide rod (5) is fixedly connected to the middle of the pressure relief cylinder (4), a piston (6) is slidably connected to the outer side of the slide rod (5), and the bottom of the piston (6) is aligned with the top of the explosion-proof tank (2), and a downward pressure spring (7) is fixedly connected between the top of the piston (6) and the inner side of the top of the pressure relief cylinder (4), and the downward pressure spring (7) is located on the outer side of the slide rod (5).

2. A hydrogen flame ionization detector according to claim 1, characterized in that: An air pipe (8) is provided at an eccentric position inside the base (1), and the air pipe (8) connects the inside of the base (1) with the outside, and a sliding hole is provided in the middle of the inside of the base (1), and the sliding hole and the air pipe (8) do not interfere with each other.

3. A hydrogen flame ionization detector according to claim 1, characterized in that: A moving block (9) is slidably connected to the interior of a middle sliding hole inside the base (1), and a nozzle (10) is fixedly connected to the top of the moving block (9), and the nozzle (10) is arranged as a hollow structure, sliding blocks are fixedly connected to both sides of the moving block (9), and sliding grooves slidably connected to the clamping blocks on both sides of the moving block (9) are arranged on both sides of the sliding hole inside the base (1).

4. A hydrogen flame ionization detector according to claim 3, characterized in that: The bottom of the nozzle (10) is fixedly connected to a conduit (11), and a slot matching the conduit (11) is provided inside the moving block (9), and the conduit (11) is fixed inside the moving block (9) through the slot inside the moving block (9), and the nozzle (10) is located inside the ignition pole (18), and the top of the nozzle (10) is flush with the top of the ignition pole (18).

5. A hydrogen flame ionization detector according to claim 4, characterized in that: The conduit (11) extends inside the moving block (9) in a direction perpendicular to the nozzle (10), and one end of the moving block (9) away from the nozzle (10) extends to the inner wall of the sliding hole inside the base (1), and a double-way pipe (12) is fixedly connected inside the base (1), and one end of the double-way pipe (12) close to the middle of the base (1) is aligned with the conduit (11), and the double-way pipe (12) and the conduit (11) are connected inside.

6. A hydrogen flame ionization detector according to claim 5, characterized in that: The sliders on both sides of the moving block (9) are provided with positioning grooves (13), and the base (1) is provided with two symmetrically distributed mounting grooves (14), and each mounting groove (14) is slidably connected with a positioning block (15), a spring is fixedly connected between a side of the positioning block (15) away from the center of the base (1) and the mounting groove (14), and an end of the positioning block (15) close to the center of the base (1) matches the positioning groove (13).

7. A hydrogen flame ionization detector according to claim 6, characterized in that: The top of the base (1) is fixedly connected to a support box (16), the middle of the support box (16) is fixedly connected to a support spring (17), and one end of the support spring (17) away from the support box (16) is fixedly connected to the bottom of the moving block (9).

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