Small flame-proof FID (Flame Ionization Detector)
Through miniaturized design and the use of explosion-proof chamber, the problems of large size, heavy weight and signal shielding of existing FID detectors are solved, and a miniaturized FID detector with excellent signal is realized.
Patent Information
- Application Number
- CN202422583934.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-24
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-10-24
AI Technical Summary
The existing FID detector has the problems of being large in size, heavy in weight and easily shielded in signal because it needs to ignite hydrogen.
The miniaturized design is adopted to isolate the combustion part separately, use the explosion-proof chamber and the annular gas barrier to isolate the signal, and use the platinum-iridium alloy ignition coil and the stainless steel collector to achieve signal amplification.
A small, light-weight FID detector with good signal quality is realized, which avoids the increase in volume and weight caused by the explosion-proof of the whole machine while maintaining good signal transmission.
Smart Images
Figure CN223377254U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an FID detector, in particular to a small explosion-proof FID detector. Background Art
[0002] The FID detector is a commonly used device for measuring VOCs (volatile organic compounds). Since the device requires the ignition of hydrogen, it is somewhat dangerous. Most VOC working conditions require explosion-proofing, so most FID devices need to be explosion-proof. The most common, simple and effective method is to flameproof the entire device. This method is to place the entire device completely in a flameproof box. It is direct and effective, but the size and weight are often too large, and some signals will be shielded by the explosion-proof box. Utility Model Content
[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a small explosion-proof FID detector with small size, light weight and good signal.
[0004] The technical solution adopted by the present invention is as follows: the present invention includes a detector body, the upper end of the detector body is connected to the detector upper cover, and the lower end is connected to the detector lower cover, an explosion-proof chamber is formed between the detector upper cover, the detector lower cover and the detector body, a pipeline fixing seat and a detector head are provided in the explosion-proof chamber, one end of the detector head is connected to the pipeline fixing seat, and the other end is connected to the detector lower cover, an ignition wire fixing seat, a polarization electrode and a collecting electrode are provided between the pipeline fixing seat and the detector head, the polarization electrode is provided on the ignition wire fixing seat through the polarization electrode fixing seat, an ignition coil is provided on the ignition wire fixing seat, a sampling pipeline and a combustion-supporting gas pipeline are connected to the detector upper cover, the sampling pipeline passes through the pipeline fixing seat and is connected to the collecting electrode, the combustion-supporting gas pipeline extends into the pipeline fixing seat and is provided corresponding to the ignition coil.
[0005] Furthermore, a heat-insulating column is provided on the detector head, and the polarization electrode is provided on the heat-insulating column.
[0006] Furthermore, a first annular air barrier is sleeved on the outer side of the detector seal head, and the first annular air barrier is located between the outer side of the detector seal head and the inner wall of the explosion-proof chamber.
[0007] Furthermore, the detector upper cover and the detector lower cover are respectively threadedly connected to the upper end and the lower end of the detector body.
[0008] Furthermore, the detector upper cover is provided with two wire holes, the sample injection line and the combustion-supporting gas line pass through the two wire holes respectively, and an epoxy resin adhesive layer is provided in the two wire holes.
[0009] Furthermore, a second annular air barrier is sleeved on the outer side of the detector upper cover, and the second annular air barrier is located between the outer side of the detector upper cover and the inner wall of the explosion-proof chamber.
[0010] Furthermore, a mounting hole is provided on the lower cover of the detector, a filter element is provided in the mounting hole, and the filter element has a filter core.
[0011] Furthermore, a heat-insulating cap is connected to the outer side of the lower cover of the detector.
[0012] Furthermore, a third annular air barrier is provided on the inner side of the detector lower cover, and the third annular air barrier is located between the detector lower cover and the detector head.
[0013] The beneficial effects of the utility model are:
[0014] Compared with the shortcomings of the existing technology, the utility model can achieve miniaturization by explosion-isolating the combustion part separately, avoiding the situation that the explosion-proof volume of the whole machine is large and heavy, and can avoid the situation that the explosion-proof volume of the whole machine shields other unknown signals of the whole machine, so that the utility model has the advantages of small volume, light weight and good signal. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.
[0016] Figure 1 It is a cross-sectional schematic diagram of the present utility model.
[0017] The reference numerals are as follows:
[0018] 1. Detector body; 2. Detector upper cover; 3. Detector lower cover; 5. Explosion-proof chamber; 6. Pipeline fixing seat; 7. Detector head; 8. Ignition wire fixing seat; 9. Polarization electrode; 10. Collecting electrode; 11. Polarization electrode fixing seat; 12. Ignition coil; 13. Sample inlet line; 15. Combustion-supporting gas line; 16. Thermal insulation column; 17. First annular air barrier; 18. Wire hole; 19. Second annular air barrier; 20. Thermal insulation spare cap; 21. Third annular air barrier.
[0019] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0020] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0021] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, clockwise, counterclockwise, etc., are only used to explain the relative position relationship and movement status of the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.
[0022] In addition, the descriptions of "first," "second," etc. in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.
[0023] like Figure 1 As shown, in this embodiment, the utility model includes a detector body 1, the upper end of the detector body 1 is connected to the detector upper cover 2, and the lower end is connected to the detector lower cover 3, the detector upper cover 2, the detector lower cover 3 and the detector body 1 form an explosion-proof chamber 5, and a pipeline fixing seat 6 and a detector head 7 are provided in the explosion-proof chamber 5, one end of the detector head 7 is connected to the pipeline fixing seat 6, and the other end is connected to the detector lower cover 3, the pipeline fixing seat 6 and the detector are connected. An ignition wire fixing seat 8, a polarizing electrode 9 and a collecting electrode 10 are arranged between the detector head 7. The polarizing electrode 9 is arranged on the ignition wire fixing seat 8 through the polarizing electrode fixing seat 11. An ignition coil 12 is arranged on the ignition wire fixing seat 8. The detector upper cover 2 is connected to a sampling pipeline 13 and a combustion-supporting gas pipeline 15. The sampling pipeline 13 passes through the pipeline fixing seat 6 and is connected to the collecting electrode 10. The combustion-supporting gas pipeline 15 extends into the pipeline fixing seat 6 and is arranged corresponding to the ignition coil 12.
[0024] It should be noted that by connecting the detector upper cover 2 and the detector lower cover 3 to the detector body 1, an explosion-proof chamber 5 for explosion-proof and signal isolation is formed; the material of the ignition coil 12 contains 70% platinum and 30% iridium, and has a diameter of 0.3mm; the collecting electrode 10 is a stainless steel tube with a length of 2cm at one end, an outer diameter of 1 / 16 inch, and an inner diameter of 0.25mm. While collecting signals, it also serves as a gas nozzle and plays a certain gas resistance role.
[0025] Compared with the shortcomings of the prior art, in the present invention, during detection, the sample gas is mixed with hydrogen and then enters the explosion-proof chamber 5 located inside the detector body 1 through the sampling pipeline 13; at the same time, the combustion-supporting air enters the explosion-proof chamber 5 through the combustion-supporting gas pipeline 15 and mixes with the sample gas, and further the ignition coil 12 self-heats and ignites and the mixed gas burns, the mixed gas is ionized and ionized into positive and negative charges, at this time the polarizing electrode 9 is connected to a high voltage of 200V, the collecting electrode 10 forms an electromotive force as a low potential with the polarizing electrode 9, and the ionized positive and negative charges are generated. One of the charges will be attracted to the electromotive force, forming an electric current. The weak current change is amplified by the circuit signal amplifier board, so that the size difference of the electric signal can be identified and converted into the concentration of the sample gas being measured. Therefore, the utility model can separately explosion-proof the combustion part to achieve miniaturization, and can avoid the situation that the explosion-proof volume of the whole machine is large and heavy, and can avoid the situation that the explosion-proof volume of the whole machine is large and heavy, and can avoid the situation that other unknown signals of the whole machine are shielded when the whole machine is explosion-proof (for example, the wireless display controller is shielded), so that the utility model has the advantages of small size, light weight and good signal.
[0026] In some embodiments, the detector head 7 is provided with an insulation column 16, and the polarization electrode 9 is provided on the insulation column 16. Specifically, since the collector 10 is made of stainless steel, it needs to be insulated by the insulation column 16, and the insulation column 16 is pressed by the detector head 7.
[0027] In certain embodiments, a first annular air barrier 17 is sleeved on the outside of the detector head 7 and positioned between the outside of the detector head 7 and the inner wall of the explosion-proof chamber 5. The first annular air barrier 17 is an O-ring; specifically, the provision of the first annular air barrier 17 between the outside of the detector head 7 and the inner wall of the explosion-proof chamber 5 prevents the escape of flammable gases.
[0028] In some embodiments, the detector upper cover 2 and the detector lower cover 3 are threadedly connected to the upper end and the lower end of the detector body 1 respectively.
[0029] In certain embodiments, the detector upper cover 2 has two wire holes 18 through which the sample feed line 13 and the combustion-supporting gas line 15 pass, respectively. An epoxy resin adhesive layer is provided in each of the wire holes 18. Specifically, by providing the epoxy resin adhesive layer in the wire holes 18, the sample feed line 13 and the combustion-supporting gas line 15 can also pass through the epoxy resin adhesive layer when passing through the two wire holes 18, thereby providing an explosion-proof function.
[0030] In certain embodiments, a second annular air barrier 19 is sleeved onto the outer side of the detector cover 2 and positioned between the outer side of the detector cover 2 and the inner wall of the explosion-proof chamber 5. The second annular air barrier 19 is an O-ring; specifically, the placement of the second annular air barrier 19 between the outer side of the detector cover 2 and the inner wall of the explosion-proof chamber 5 prevents the escape of flammable gases.
[0031] In some embodiments, the detector lower cover 3 is provided with a mounting hole, in which a filter element is provided, wherein the filter element comprises a filter element, specifically, a stainless steel filter disc, and the filter element size is 90 to 100 μm.
[0032] In some embodiments, a heat-insulating cap 20 is connected to the outer side of the detector lower cover 3. Specifically, the heat-insulating cap 20 is connected to the detector lower cover 3 for heat insulation to prevent open flames from spraying outward.
[0033] In some embodiments, a third annular air baffle 21 is provided inside the detector lower cover 3 and located between the detector lower cover 3 and the detector head 7. The third annular air baffle 21 is an O-ring; specifically, the provision of the third annular air baffle 21 between the detector lower cover 3 and the detector head 7 prevents the escape of flammable gases.
[0034] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A small explosion-proof FID detector, characterized by: The invention comprises a detector body (1), wherein the upper end of the detector body (1) is connected to a detector upper cover (2), and the lower end is connected to a detector lower cover (3), an explosion-proof chamber (5) is formed between the detector upper cover (2), the detector lower cover (3) and the detector body (1), a pipeline fixing seat (6) and a detector head (7) are provided in the explosion-proof chamber (5), one end of the detector head (7) is connected to the pipeline fixing seat (6), and the other end is connected to the detector lower cover (3), and a flameproof chamber (5) is provided between the pipeline fixing seat (6) and the detector head (7). An ignition wire fixing seat (8), a polarizing electrode (9) and a collecting electrode (10) are provided. The polarizing electrode (9) is arranged on the ignition wire fixing seat (8) through the polarizing electrode fixing seat (11). An ignition coil (12) is arranged on the ignition wire fixing seat (8). A sampling pipeline (13) and a combustion-supporting gas pipeline (15) are connected to the detector upper cover (2). The sampling pipeline (13) passes through the pipeline fixing seat (6) and is connected to the collecting electrode (10). The combustion-supporting gas pipeline (15) extends into the pipeline fixing seat (6) and is arranged corresponding to the ignition coil (12).
2. The small explosion-proof FID detector according to claim 1, characterized in that: A heat-insulating column (16) is provided on the detector head (7), and the polarization electrode (9) is provided on the heat-insulating column (16).
3. A small explosion-proof FID detector according to claim 1 or 2, characterized in that: A first annular air barrier (17) is sleeved on the outer side of the detector seal head (7), and the first annular air barrier (17) is located between the outer side of the detector seal head (7) and the inner wall of the explosion-proof chamber (5).
4. The small explosion-proof FID detector according to claim 1, characterized in that: The detector upper cover (2) and the detector lower cover (3) are respectively threadedly connected to the upper end and the lower end of the detector body (1).
5. A small explosion-proof FID detector according to claim 1 or 4, characterized in that: The detector upper cover (2) is provided with two wire holes (18), the sample feed line (13) and the combustion-supporting gas line (15) respectively pass through the two wire holes (18), and an epoxy resin adhesive layer is provided in the two wire holes (18).
6. The small explosion-proof FID detector according to claim 5, characterized in that: A second annular air barrier (19) is sleeved on the outer side of the detector upper cover (2), and the second annular air barrier (19) is located between the outer side of the detector upper cover (2) and the inner wall of the explosion-proof chamber (5).
7. A small-sized explosion-proof FID detector according to claim 1 or 4, characterized in that: The detector lower cover (3) is provided with a mounting hole, in which a filter element is provided, and the filter element has a filter core.
8. The small explosion-proof FID detector according to claim 7, characterized in that: The outer side of the detector lower cover (3) is connected to a heat insulating cap (20).
9. The small-sized explosion-proof FID detector according to claim 7, characterized in that: A third annular air barrier (21) is provided on the inner side of the detector lower cover (3), and the third annular air barrier (21) is located between the detector lower cover (3) and the detector sealing head (7).