A device for improving the accuracy of VOCs portable detector

Abstract

The invention discloses a device for improving the accuracy of a portable VOCs detector. The device comprises an instrument body, wherein a detection cavity is arranged inside the instrument body, an FID detector body is installed on one side inside the instrument body, a signal acquisition module is arranged at the upper end inside the FID detector body, a signal collector is installed at the detection end of the signal acquisition module, and a signal acquisition lead-out line is arranged at the output end of the signal acquisition module; the device also comprises a high-pressure gas storage tank, which is arranged at the rear end of the FID detector body, a gas transmission main pipe is arranged at the bottom of the high-pressure gas storage tank, a first purge pipe and a second purge pipe are respectively arranged at one end of the gas transmission main pipe, and an electromagnetic valve is installed at one end of the gas transmission main pipe close to the high-pressure gas storage tank. In this way, the electromagnetic valve is controlled by an explosion-proof hand operator to perform purge, and the FID detector can protect the ignition coil in a convenient way and quickly achieve internal cleaning.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen flame ionization detectors, in particular to a device for improving the accuracy of a portable VOCs detector. Background Art

[0002] FID uses hydrogen as the combustion gas, which burns at the nozzle in a cylindrical electrode. The voltage between the nozzle and the electrode is as high as several hundred volts. When the carbon-containing solute burns at the nozzle, the generated electron / ion pairs are collected by the nozzle and the electrode to generate current, which is amplified and transmitted to the A / D converter of the recorder or computer data acquisition system.

[0003] For example, the Chinese authorized patent "A FID detector analysis device" with announcement number CN215812601U includes an FID outer cover, a sample injection base, a heating wire, a heating wire power supply spring top, a heating wire power supply interface pin, a collector, a collection signal line, a hydrogen gas inlet and a sample gas inlet. An ionization chamber is arranged inside the FID outer cover, a nut cover is arranged on the top of the FID outer cover, ceramic heating fixing seats are arranged on both sides of the ionization chamber, the heating wire is connected between the ceramic heating fixing seats, and the collector and the heating wire are arranged in the ionization chamber. By removing the nut cover, the collector and the heating wire can be taken out for maintenance and cleaning, and the sample injection base is sealed with the FID outer cover thread, which is convenient for disassembly, cleaning and maintenance of the sample injection base.

[0004] In the above-mentioned prior art, water will accumulate when the detector is ignited for a long time, which may damage the pollution signal and easily cause the ignition coil to short-circuit. At the same time, it is extremely difficult to clean the inside of the FID detector after it is contaminated. The water vapor and pollutants produced by combustion are difficult to be directly discharged from the inside of the detector through the flame arrester. Therefore, it does not meet the existing needs. In this regard, we propose a device to improve the accuracy of VOCs portable detectors. Summary of the invention

[0005] The object of the present invention is to provide a device for improving the accuracy of a portable VOCs detector, so as to solve the problem of how to protect the ignition coil of the FID detector proposed in the above background technology in a convenient way and quickly achieve internal cleaning.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a device for improving the accuracy of a portable VOCs detector, comprising an instrument body, a detection cavity is arranged inside the instrument body, a FID detector body is installed on one side inside the instrument body, a signal acquisition module is arranged at the upper end inside the FID detector body, a signal collector is installed at the detection end of the signal acquisition module, and the signal collector extends to the inside of the detection cavity, and a signal acquisition lead wire is arranged at the output end of the signal acquisition module;

[0007] It also includes a high-pressure gas storage tank, which is arranged at the rear end of the FID detector body. A gas supply pipe is arranged at the bottom of the high-pressure gas storage tank. A first purge pipe and a second purge pipe are respectively arranged at one end of the gas supply pipe, and the first purge pipe and the second purge pipe both extend to the interior of the FID detector body. A solenoid valve is installed at one end of the gas supply pipe close to the high-pressure gas storage tank.

[0008] Preferably, an ignition coil is installed on one side inside the FID detector body, a mounting base is provided below the ignition coil, and the mounting base is fixed to the FID detector body, an electromagnetic spring is installed at one end of the mounting base, and one side of the electromagnetic spring is connected to the mounting base through a rotating shaft.

[0009] Preferably, a flame arrester is installed at the lower end of the interior of the FID detector body, and the outer wall of the flame arrester is sealed and connected to the FID detector body, and a V-shaped groove is provided at the upper end of the flame arrester.

[0010] Preferably, epoxy resin is filled between the FID detector body and the signal acquisition module, and the epoxy resin wraps the entire signal acquisition module and one end of the signal acquisition lead wire.

[0011] Preferably, a nozzle is provided on one side of the lower end of the signal collector, and one end of the nozzle extends to the outside of the FID detector body, and the nozzle transports a mixed gas of hydrogen, air and the gas to be detected into the detection chamber.

[0012] Preferably, the input end of the solenoid valve is connected to an external explosion-proof handheld operator via Bluetooth.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention can realize internal cleaning. After the detection work is completed, the electromagnetic valve is controlled by the explosion-proof hand operator to perform purging. The high-pressure air inside the high-pressure gas storage tank is respectively transported to the first purge pipe and the second purge pipe through the gas transmission main pipe, so that the high-pressure air forms an impact inside the FID detector body, so that the water and dirt attached to the inner wall are quickly separated from them, and then fall to the flame arrester under the action of gravity. The flame arrester has a V-shaped structure, which is convenient for the moisture generated by combustion to flow downward at the edge of the inner cylinder wall of the FID detector body, and is discharged through the funnel-shaped flame arrester, which will greatly improve the discharge efficiency of moisture and pollutants, and solve the problem that the performance parameter index does not meet the relevant detection standards due to the pollution inside the FID detector. In this way, the inside of the FID detector body can be quickly cleaned, and there is no need to regularly disassemble and assemble the device, reduce the maintenance frequency of the FID detector, reduce the cleaning work inside the detector, reduce the number of times the flame arrester is cleaned, and the use time is longer, reducing the pollution inside the FID of the instrument and equipment, and improving the high sensitivity and high precision of the instrument and equipment used on site, thereby providing real and effective detection data.

[0015] 2. The present invention provides an electromagnetic spring under the ignition coil. During ignition, the electromagnetic spring is in a horizontal state, so that the ignition coil can be connected with the detection cavity. After the ignition is successful, power is turned on to activate the magnetism of the electromagnetic spring, so that one end of the electromagnetic spring rotates 90 degrees with the center of the mounting base shaft as the origin, thereby blocking the ignition coil and the detection cavity. Then, except for detection, the ignition coil is in an independent protection state, which effectively isolates the water vapor and pollutants generated during combustion from contacting the ignition coil, thereby improving its own service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram of the detector of the present invention;

[0017] Figure 2 It is a side view of the internal structure of the detector of the present invention;

[0018] Figure 3 A three-dimensional diagram of a FID detector of the present invention;

[0019] Figure 4 A schematic diagram of the internal structure of the FID detector of the present invention during operation;

[0020] Figure 5 This is a schematic diagram of the internal structure of the FID detector of the present invention after the detector has finished working.

[0021] In the figure: 1. Instrument body; 2. FID detector body; 3. High-pressure gas storage tank; 7. Signal acquisition lead wire; 11. Epoxy resin; 12. Signal acquisition module; 13. Signal collector; 14. Nozzle; 15. First purge pipe; 16. Second purge pipe; 17. Ignition coil; 18. Electromagnetic shrapnel; 19. Flame arrester; 20. Gas supply main pipe; 21. Solenoid valve; 22. V-groove; 23. Mounting seat. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] See also Figure 1-5 , an embodiment provided by the present invention: a device for improving the accuracy of a portable VOCs detector, comprising an instrument body 1, a detection cavity is arranged inside the instrument body 1, a FID detector body 2 is installed on one side inside the instrument body 1, a signal acquisition module 12 is arranged at the upper end inside the FID detector body 2, a signal collector 13 is installed at the detection end of the signal acquisition module 12, and the signal collector 13 extends to the inside of the detection cavity, and a signal acquisition lead 7 is arranged at the output end of the signal acquisition module 12;

[0024] It also includes a high-pressure gas storage tank 3, which is arranged at the rear end of the FID detector body 2. A gas supply pipe 20 is arranged at the bottom of the high-pressure gas storage tank 3. A first purge pipe 15 and a second purge pipe 16 are respectively arranged at one end of the gas supply pipe 20, and the first purge pipe 15 and the second purge pipe 16 both extend to the interior of the FID detector body 2. A solenoid valve 21 is installed at one end of the gas supply pipe 20 close to the high-pressure gas storage tank 3.

[0025] See also Figure 3 and Figure 4 An ignition coil 17 is installed on one side of the inside of the FID detector body 2, a mounting base 23 is arranged below the ignition coil 17, and the mounting base 23 is fixed to the FID detector body 2, an electromagnetic spring 18 is installed at one end of the mounting base 23, and one side of the electromagnetic spring 18 is connected to the mounting base 23 through a rotating shaft.

[0026] See also Figure 2 A flame arrester 19 is installed at the lower end of the FID detector body 2, and the outer wall of the flame arrester 19 is sealed and connected to the FID detector body 2, and a V-shaped groove 22 is provided at the upper end of the flame arrester 19.

[0027] See also Figure 2Epoxy resin 11 is filled between the FID detector body 2 and the signal acquisition module 12 , and the epoxy resin 11 wraps the entire signal acquisition module 12 and one end of the signal acquisition lead wire 7 .

[0028] See also Figure 2 A nozzle 14 is provided on one side of the lower end of the signal collector 13, and one end of the nozzle 14 extends to the outside of the FID detector body 2. The nozzle 14 transports a mixed gas of hydrogen, air and the gas to be detected into the detection chamber.

[0029] See also Figure 2 , the input end of the solenoid valve 21 is connected to the external explosion-proof handheld operator via Bluetooth.

[0030] Working principle: When in use, the nozzle 14 transports a mixture of hydrogen and the gas to be detected into the detection chamber, and the mixed gas is ignited under the action of the ignition coil 17. After successful ignition, the magnetism of the electromagnetic spring 18 is activated by power. Under the action of magnetic adsorption, one end of the electromagnetic spring 18 is rotated 90 degrees with the center of the rotating shaft of the mounting seat 23 as the origin, blocking the ignition coil 17 and the detection chamber. The solenoid valve 21 is controlled by an explosion-proof hand operator for purging. The high-pressure air inside the high-pressure gas storage tank 3 is respectively transported to the first purge pipe 15 and the second purge pipe 16 through the gas transmission main pipe 20, so that the high-pressure air forms an impact inside the FID detector body 2, and the water and dirt attached to the inner wall are quickly separated from them, and then fall to the flame arrester 19 under the action of gravity. The flame arrester 19 has a V-shaped structure, which is convenient for the moisture generated by combustion to flow downward at the edge of the inner cylinder wall of the FID detector body 2 and be discharged through the flame arrester 19.

[0031] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A device for improving the accuracy of a portable VOCs detector, comprising an instrument body (1), wherein a detection cavity is arranged inside the instrument body (1), a FID detector body (2) is installed on one side inside the instrument body (1), a signal acquisition module (12) is arranged at the upper end inside the FID detector body (2), a signal collector (13) is installed at the detection end of the signal acquisition module (12), and the signal collector (13) extends to the inside of the detection cavity, and a signal acquisition lead wire (7) is arranged at the output end of the signal acquisition module (12), characterized in that: The invention also comprises a high-pressure gas storage tank (3), which is arranged at the rear end of the FID detector body (2); a gas supply pipe (20) is arranged at the bottom of the high-pressure gas storage tank (3); a first purge pipe (15) and a second purge pipe (16) are respectively arranged at one end of the gas supply pipe (20); and the first purge pipe (15) and the second purge pipe (16) both extend into the interior of the FID detector body (2); a solenoid valve (21) is installed at one end of the gas supply pipe (20) close to the high-pressure gas storage tank (3); an ignition coil (17) is installed at one side of the interior of the FID detector body (2); a mounting seat (23) is arranged below the ignition coil (17); and the mounting seat (23) is fixed to the FID detector body (2); an electromagnetic spring (18) is installed at one end of the mounting seat (23); and one side of the electromagnetic spring (18) is connected to the mounting seat (23) via a rotating shaft.

2. The device for improving the accuracy of a portable VOCs detector according to claim 1, characterized in that: A flame arrester (19) is installed at the lower end of the interior of the FID detector body (2), and the outer wall of the flame arrester (19) is sealed and connected to the FID detector body (2). A V-shaped groove (22) is provided at the upper end of the flame arrester (19).

3. The device for improving the accuracy of a portable VOCs detector according to claim 1, characterized in that: Epoxy resin (11) is filled between the FID detector body (2) and the signal acquisition module (12), and the epoxy resin (11) wraps the entire signal acquisition module (12) and one end of the signal acquisition lead wire (7).

4. The device for improving the accuracy of a portable VOCs detector according to claim 1, characterized in that: A nozzle (14) is provided on one side of the lower end of the signal collector (13), and one end of the nozzle (14) extends to the outside of the FID detector body (2). The nozzle (14) transports a mixed gas of hydrogen, air and a gas to be detected into the detection chamber.

5. The device for improving the accuracy of a portable VOCs detector according to claim 1, characterized in that: The input end of the solenoid valve (21) is connected to an external explosion-proof handheld operator via Bluetooth.

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