Gas detector

Abstract

The invention provides a gas detector which is characterized in that a detection carrier is arranged in a shell, a discharge cavity, a conduction channel, a detection cavity and a mounting cavity are sequentially formed in the detection carrier, a spherical electrode and a needle electrode are arranged in the discharge cavity, the gas outlet end of a first gas inlet pipe is communicated with the discharge cavity, and a chromatographic column is arranged in the detection cavity; the detector polarization plate is arranged in the mounting cavity and is electrically connected with the gas chromatograph; the air outlet end of the second air inlet pipe is communicated with the detection cavity. According to the scheme, annular discharge of the carrier gas is realized through the spherical electrode and the needle-shaped electrode, molecules of the gas to be detected and annular discharge products of the carrier gas are subjected to inelastic collision to ionize an analyte, formed zwitterions are collected by a polarization region of a polarization plate of the detector and form current, and the current is detected. The current is in direct proportion to the concentration of the analyte in the sample gas, so that a corresponding chromatogram is obtained; by carrying the gas chromatograph, better detection can be realized, the detection performance is high, and the purchase cost of an enterprise can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas detection, in particular to a gas detector. BACKGROUND

[0002] The gas industry is a basic industry of the national economy, with the rapid development of the national economy, the gas industry, especially the high-purity and ultra-pure gas and electronic gas industry, is also booming. The detection of trace impurities in gas is a key link in the production of high-purity gas and electronic industrial gas, and the analysis of trace impurities in these gases has always been a difficulty in chromatographic analysis. The original thermal conductivity and other chromatographic detectors cannot meet the requirements of high-purity gas analysis. SUMMARY

[0003] The present application provides a kind of gas detector, and the annular discharge of carrier gas is realized by spherical electrode and needle electrode, and the product of carrier gas annular discharge and the gas to be detected that has been separated successively enters and crosses the polarization plate of detector after passing through chromatographic column, the molecule of gas to be detected and the product of carrier gas annular discharge are ionized analyte after inelastic collision, the formed anion and cation are collected by the polarization area of detector polarization plate, and form current, which is transmitted to gas chromatograph, and the current is proportional to the concentration of analyte in sample gas, so as to obtain corresponding chromatogram;With gas chromatograph, better detection can be achieved, with high detection performance, which can reduce the use cost and reduce the procurement cost of enterprises.

[0004] To solve the above technical problems, the technical scheme of the present application is as follows: A kind of gas detector, comprising: A shell; A detection carrier, the detection carrier is arranged in the shell, and the detection carrier is sequentially formed with discharge cavity, conducting channel, detection cavity and mounting cavity inside, and the discharge cavity, the conducting channel, the detection cavity and the mounting cavity are sequentially communicated; A spherical electrode and a needle electrode, the spherical electrode and the needle electrode are arranged in the discharge cavity, the spherical electrode and the needle electrode are arranged close to each other, and the spherical electrode and the needle electrode are electrically connected with power supply; A first gas inlet pipe, the gas outlet end of the first gas inlet pipe is communicated with the discharge cavity, so as to inject carrier gas into the discharge cavity; A chromatographic column, the chromatographic column is arranged in the detection cavity; A detector polarization plate, the detector polarization plate is arranged in the mounting cavity, the polarization area of the detector polarization plate corresponds to the chromatographic column, and the detector polarization plate is electrically connected with gas chromatograph; A second air inlet pipe, an air outlet end of the second air inlet pipe being communicated with the detection cavity to inject the gas to be detected into the detection cavity, the air outlet end of the second air inlet pipe being close to the conduction channel. An air outlet pipe, an air inlet end of the air outlet pipe being communicated with the detection cavity, the air inlet end of the air outlet pipe being far away from the conduction channel.

[0005] Optionally, the shell comprises: A shell, one side of the shell being an open structure, the detection carrier being located inside the shell, a surface of the open structure of the shell being provided with a plurality of first threaded holes; A cover plate, the cover plate corresponding to the open structure of the shell, a surface of the cover plate being provided with a plurality of first positioning holes, the plurality of first positioning holes corresponding to the plurality of first threaded holes respectively; A plurality of screws, ends of the plurality of screws penetrating through the plurality of first positioning holes respectively, and the ends of the plurality of screws being screwed into the plurality of first threaded holes respectively.

[0006] Optionally, the shell further comprises: An avoiding groove, the avoiding groove being provided on a surface of the shell, the first air inlet pipe, the second air inlet pipe and the air outlet pipe penetrating through the avoiding groove.

[0007] Optionally, the gas detector further comprises: A plurality of supporting blocks, the plurality of supporting blocks being formed on a surface of the shell, a surface of the plurality of supporting blocks being provided with a plurality of second threaded holes; A positioning plate, a surface of the positioning plate being provided with a plurality of second positioning holes, the plurality of second positioning holes corresponding to the plurality of second threaded holes respectively; A plurality of positioning bolts, ends of the plurality of positioning bolts penetrating through the plurality of second positioning holes respectively, and the ends of the plurality of positioning bolts being screwed into the plurality of second threaded holes respectively; The surface of the positioning plate being provided with three limiting holes, the three limiting holes corresponding to the first air inlet pipe, the second air inlet pipe and the air outlet pipe respectively, the first air inlet pipe, the second air inlet pipe and the air outlet pipe penetrating through the corresponding limiting holes respectively.

[0008] Optionally, the gas detector further comprises: The discharge cavity penetrating through a first end surface of the detection carrier, the first end surface of the detection carrier being provided with a plurality of fourth threaded holes; A bearing plate, a surface of the bearing plate being provided with a plurality of connecting holes, the plurality of connecting holes corresponding to the plurality of fourth threaded holes respectively; A plurality of connecting bolts, ends of the plurality of connecting bolts penetrating through the plurality of connecting holes respectively, and the ends of the plurality of connecting bolts being screwed into the plurality of fourth threaded holes respectively; A first electrical connection column is embedded in the surface of the bearing plate, and a first end of the first electrical connection column penetrates the bearing plate and is connected with the spherical electrode; A second electrical connection column is embedded in the surface of the bearing plate, and a first end of the second electrical connection column penetrates the bearing plate and is connected with the needle electrode.

[0009] Optionally, the gas detector further comprises: A first wire slot is provided on the upper surface of the shell, and the first wire slot is close to the discharge cavity; A first support is connected with the shell, and the first support is close to the discharge cavity; A first terminal is provided on the first support, and the first terminal is electrically connected with a second end of the first electrical connection column through a first wire; A second terminal is provided on the first support, and the second terminal is electrically connected with a second end of the second electrical connection column through a second wire; The first wire and the second wire penetrate the first wire slot.

[0010] Optionally, the gas detector further comprises: A limiting piece is threadedly connected with the mounting cavity at one end, and the other end of the limiting piece abuts against the detector polarization plate, and a wire cavity is provided in the limiting piece.

[0011] Optionally, the gas detector further comprises: A second wire slot is provided on the upper surface of the shell, and the second wire slot is close to the mounting cavity; A second support is connected with the shell, and the second support is close to the mounting cavity; A third terminal is provided on the second support, and the third terminal is electrically connected with the detector polarization plate through a third wire, and the third wire penetrates the second wire slot.

[0012] Optionally, the gas detector further comprises: A plurality of counterbores are provided on the bottom surface of the shell; A first flat portion is provided on the outer side of the detection carrier, and the first flat portion abuts against the inner bottom surface of the shell; A plurality of third threaded holes are provided on the surface of the first flat portion, and the plurality of third threaded holes correspond to the plurality of counterbores, respectively; Multiple fastening bolts, with the ends of the bolts passing through multiple countersunk holes, and the ends of the bolts being threaded into multiple third threaded holes.

[0013] Optionally, the gas detector further includes: The second planar portion is disposed on the outer side of the detection carrier; The first air passage is disposed on the second flat part and is connected to the discharge cavity. The outlet end of the first air inlet pipe is inserted into the first air passage, and the space between the outer wall of the first air inlet pipe and the port of the first air passage is filled with sealant. The second air passage is disposed on the second flat part and is connected to the detection chamber. The outlet end of the second air inlet pipe is inserted into the second air passage, and the space between the outer wall of the second air inlet pipe and the port of the second air passage is filled with sealant. The third air passage is disposed in the second flat portion and is connected to the detection chamber. The air inlet end of the air outlet pipe is inserted into the third air passage, and the space between the outer wall of the air outlet pipe and the port of the third air passage is filled with sealant.

[0014] The above-described solution of the present invention has at least the following beneficial effects: The above-described solution of the present invention achieves ring discharge of the carrier gas through spherical and needle electrodes. Passing through the chromatographic column, the products of the ring discharge of the carrier gas and the separated target gas successively enter and cross the detector polarization plate. The molecules of the target gas and the products of the ring discharge of the carrier gas ionize the analytes after inelastic collisions. The resulting anions and cations are collected by the polarization zone of the detector polarization plate and form a current. This current is transmitted to the gas chromatograph, and the current is proportional to the concentration of the analyte in the sample gas, thereby obtaining the corresponding chromatogram. By integrating with a gas chromatograph, better detection is achieved, detection performance is high, and operating costs and enterprise procurement costs can be reduced. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of a gas detector provided in an embodiment of the present invention; Figure 2 This is a front sectional view of a gas detector provided in an embodiment of the present invention; Figure 3 yes Figure 2 Enlarged schematic diagram of part A; Figure 4 This is a front sectional view of the detection carrier in the gas detector provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the housing in the gas detector provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the detection carrier in the gas detector provided in an embodiment of the present invention.

[0016] The annotations in the attached figures are explained as follows: 11. Housing; 111. Support block; 112. Second threaded hole; 12. Cover plate; 13. First positioning hole; 14. Countersunk hole; 15. Fastening bolt; 16. First threaded hole; 17. Clearance groove; 18. First wire passage groove; 19. Second wire passage groove; 2. Positioning plate; 21. Positioning bolt; 22. Limiting hole; 31. First air inlet pipe; 32. Second air inlet pipe; 33. Air outlet pipe; 41. First bracket; 42. First wiring terminal; 43. Second wiring terminal; 44. Spherical electrode; 45. Needle electrode; 46. 47. First electrode column; 5. Second electrode column; 6. Detector carrier; 7. Discharge chamber; 8. Conductive channel; 9. Detection chamber; 10. Mounting chamber; 11. First flat part; 12. Third threaded hole; 13. Fourth threaded hole; 14. Second flat part; 15. First gas channel; 16. Second gas channel; 17. Third gas channel; 18. Detector polarization plate; 19. Second support; 10. Third terminal; 11. Chromatographic column; 12. Support plate; 13. Connecting hole; 14. Connecting bolt; 15. Limiting element; 16. Threading chamber. Detailed Implementation

[0017] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0018] like Figures 1 to 6 As shown, an embodiment of the present invention provides a gas detector, comprising: shell; The detection carrier 5 is disposed inside the outer shell. Inside the detection carrier 5, a discharge cavity 51, a conductive channel 52, a detection cavity 53 and a mounting cavity 54 are sequentially formed. The discharge cavity 51, the conductive channel 52, the detection cavity 53 and the mounting cavity 54 are connected in sequence. Spherical electrode 44 and needle electrode 45 are disposed in discharge cavity 51, and are arranged close to each other. Spherical electrode 44 and needle electrode 45 are electrically connected to power supply. The first air inlet pipe 31 has an outlet end connected to the discharge cavity 51 to inject carrier gas into the discharge cavity 51. Chromatographic column 7 is installed in detection chamber 53; A detector polarization plate 6 is arranged in the installation cavity 54, and a polarization area of the detector polarization plate 6 corresponds to the chromatographic column 7, and the detector polarization plate 6 is electrically connected with the gas chromatograph; A second gas inlet pipe 32, and an outlet end of the second gas inlet pipe 32 is communicated with the detection cavity 53, so as to inject the gas to be detected into the detection cavity 53, and the outlet end of the second gas inlet pipe 32 is close to the through channel 52. An outlet pipe 33, and an inlet end of the outlet pipe 33 is communicated with the detection cavity 53, and the inlet end of the outlet pipe 33 is far away from the through channel 52.

[0019] In this embodiment, the spherical electrode 44 and the needle electrode 45 are electrically connected with the power supply, the inlet end of the first gas inlet pipe 31 is connected with the carrier gas supply device, the inlet end of the second gas inlet pipe 32 is connected with the gas to be detected supply device, the outlet end of the outlet pipe 33 is connected with the gas collection device, and the detector polarization plate 6 is electrically connected with the gas chromatograph; the carrier gas is injected into the discharge cavity 51 through the first gas inlet pipe 31, the carrier gas is circularly discharged through the spherical electrode 44 and the needle electrode 45, the product of the carrier gas circular discharge enters the detection cavity 53 through the gas guide channel, the gas to be detected is injected into the detection cavity 53 through the second gas inlet pipe 32, the product of the carrier gas circular discharge and the separated gas to be detected enter the detector polarization plate 6 in turn and cross the detector polarization plate 6, the molecules of the gas to be detected and the product of the carrier gas circular discharge ionize the analyte through non-elastic collision, the formed positive and negative ions are collected by the polarization area of the detector polarization plate 6, and an electric current is formed, the electric current is transmitted to the gas chromatograph, the electric current is proportional to the concentration of the analyte in the sample gas, and the corresponding chromatogram is obtained; through the gas chromatograph, the detection can be better, the detection performance is high, the use cost can be reduced, and the enterprise procurement cost can be reduced; Specifically, the carrier gas can be helium.

[0020] As shown in Figure 1 and Figure 5 In an optional embodiment of the present application, the shell includes: A shell 11, one side of the shell 11 is an open structure, the detection carrier 5 is located inside the shell 11, and a plurality of first threaded holes 16 are arranged on the surface of the open structure of the shell 11; A cover plate 12, the cover plate 12 corresponds to the open structure of the shell 11, a plurality of first positioning holes 13 are arranged on the surface of the cover plate 12, and the plurality of first positioning holes 13 correspond to the plurality of first threaded holes 16 respectively; A plurality of screws, the ends of the plurality of screws pass through the plurality of first positioning holes 13 respectively, and the ends of the plurality of screws are threadedly connected with the plurality of first threaded holes 16 respectively.

[0021] In the embodiment, the detachable connection of the cover plate 12 and the shell 11 can be realized through the plurality of screws, the plurality of first positioning holes 13 and the plurality of first threaded holes 16, so that the detection carrier 5 inside the shell 11 is convenient to maintain.

[0022] As shown in Figure 5 , in an optional embodiment of the present application, the shell further comprises: The avoidance groove 17 is arranged through the upper surface of the shell 11, and the first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33 all penetrate the avoidance groove 17.

[0023] In the embodiment, the first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33 are convenient to penetrate the shell 11 through the arrangement of the avoidance groove 17, so as to ensure the smooth injection of the carrier gas and the to-be-detected gas and the discharge of the mixed gas after detection.

[0024] As shown in Figure 1 , Figure 2 and Figure 5 , in an optional embodiment of the present application, the gas detector further comprises: The plurality of support blocks 111 are shaped on the upper surface of the shell 11, and the upper surfaces of the plurality of support blocks 111 are all provided with the plurality of second threaded holes 112; The positioning plate 2 is provided with the plurality of second positioning holes on the surface, and the plurality of second positioning holes are respectively corresponding to the plurality of second threaded holes 112; The plurality of positioning bolts 21 are respectively threaded into the plurality of second threaded holes 112 through the plurality of second positioning holes on the ends; The surface of the positioning plate 2 is provided with the three limiting holes 22, and the three limiting holes 22 are respectively corresponding to the first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33, and the first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33 respectively penetrate the corresponding limiting holes 22.

[0025] In the embodiment, the detachable connection of the positioning plate 2 and the plurality of support blocks 111 can be realized through the plurality of positioning bolts 21, the plurality of second positioning holes and the plurality of second threaded holes 112, and the first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33 can be limited through the positioning plate 2 and the three limiting holes 22, so as to ensure that the parts of the first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33 in the shell 11 are in the vertical state, ensure the smoothness of the first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33, and thus ensure the smooth injection of the carrier gas and the to-be-detected gas and the discharge of the mixed gas after detection.

[0026] As shown in Figure 2 and Figure 4As shown, in an optional embodiment of the present invention, the gas detector further includes: The discharge cavity 51 penetrates the first end face of the detection carrier 5, and the first end face of the detection carrier 5 is provided with a plurality of fourth threaded holes 57. The support plate 8 has multiple connecting holes 81 through its surface, and the multiple connecting holes 81 correspond to multiple fourth threaded holes 57 respectively. Multiple connecting bolts 82, the ends of which pass through multiple connecting holes 81 respectively, and the ends of the multiple connecting bolts 82 are threadedly connected to multiple fourth threaded holes 57 respectively. The first electrode post 46 is embedded in the surface of the support plate 8, and the first end of the first electrode post 46 penetrates the support plate 8 and is connected to the spherical electrode 44. The second electrode post 47 is embedded in the surface of the carrier plate 8, and the first end of the second electrode post 47 penetrates the carrier plate 8 and is connected to the needle electrode 45.

[0027] In this embodiment, the carrier plate 8 and the detection carrier 5 are detachably connected by multiple connecting bolts 82, multiple connecting holes 81 and multiple fourth threaded holes 57; the carrier plate 8 is used to fix the spherical electrode 44 and the needle electrode 45, so that the spherical electrode 44 and the needle electrode 45 are stably placed in the discharge cavity 51, ensuring the discharge effect of the spherical electrode 44 and the needle electrode 45; the first terminal post 46 is used to connect the spherical electrode 44 to the power supply, and the second terminal post 47 is used to connect the needle electrode 45 to the power supply.

[0028] like Figure 1 and Figure 5 As shown, in an optional embodiment of the present invention, the gas detector further includes: The first wire groove 18 is disposed through the upper surface of the housing 11 and is close to the discharge cavity 51. The first bracket 41 is connected to the housing 11 and is close to the discharge cavity 51; The first terminal 42 is mounted on the first bracket 41 and is electrically connected to the second end of the first terminal post 46 via a first wire. The second terminal 43 is mounted on the first bracket 41 and is electrically connected to the second end of the second terminal 47 via a second wire. The first and second conductors pass through the first wire groove 18.

[0029] In the embodiment, the first connecting terminal 42 and the second connecting terminal 43 are fixed by the first support 41, the first connecting terminal 42 is electrically connected with the first connecting column 46 by the first wire, and thus the spherical electrode 44 is electrically connected with the power supply through the first connecting terminal 42, the first wire and the first connecting column 46; The second connecting terminal 43 is electrically connected with the second connecting column 47 by the second wire, and thus the needle-shaped electrode 45 is electrically connected with the power supply through the second connecting terminal 43, the second wire and the second connecting column 47; The first wire and the second wire are conveniently penetrated through the shell 11 by the first wire slot 18; The first connecting terminal 42 and the second connecting terminal 43 can be quick connecting plugs such as butt-type quick plugs.

[0030] As shown in the figure, Figure 4 In an optional embodiment of the present application, the gas detector further comprises: The limiting piece 9 is threadedly connected with the mounting cavity 54 at the end thereof, the end of the limiting piece 9 abuts against the detector polarization plate 6, and the wire-through cavity 91 is provided in the limiting piece 9.

[0031] In the embodiment, the detector polarization plate 6 is fixed in the mounting cavity 54 by the limiting piece 9, the detector polarization plate 6 is stably arranged in the mounting cavity 54, the polarization area of the detector polarization plate 6 accurately corresponds to the chromatographic column 7, and the detection accuracy is ensured; the detector polarization plate 6 is electrically connected with the gas chromatograph through the wire-through cavity 91.

[0032] As shown in the figure, Figure 5 In an optional embodiment of the present application, the gas detector further comprises: The second wire-through slot 19 is provided on the upper surface of the shell 11, and the second wire-through slot 19 is close to the mounting cavity 54; The second support 61 is connected with the shell 11, and the second support 61 is close to the mounting cavity 54; The third connecting terminal 62 is provided on the second support 61, the third connecting terminal 62 is electrically connected with the detector polarization plate 6 by the third wire, and the third wire penetrates through the second wire-through slot 19.

[0033] In the embodiment, the third terminal 62 is fixed by the second support 61, the third terminal 62 is electrically connected with the detector polarization plate 6 by the third wire, the detector polarization plate 6 is electrically connected with the gas chromatograph by the third terminal 62 and the third wire, and the electrical connection operation of the detector polarization plate 6 and the gas chromatograph is simplified; wherein the third terminal 62 can be a plug-in quick plug or the like capable of realizing quick connection.

[0034] As shown in Figure 2 , Figure 3 , Figure 4 and Figure 6 , in an optional embodiment of the present application, the gas detector further comprises: a plurality of counterbores 14, the plurality of counterbores 14 are arranged through the bottom surface of the shell 11; a first flat portion 55, the first flat portion 55 is arranged on the outer side of the detection carrier 5, and the first flat portion 55 abuts against the inner bottom surface of the shell 11; a plurality of third threaded holes 56, the plurality of third threaded holes 56 are arranged on the surface of the first flat portion 55, and the plurality of third threaded holes 56 respectively correspond to the plurality of counterbores 14; a plurality of fastening bolts 15, the ends of the plurality of fastening bolts 15 respectively pass through the plurality of counterbores 14, and the ends of the plurality of fastening bolts 15 are respectively threadedly connected with the plurality of third threaded holes 56.

[0035] In the embodiment, the detection carrier 5 is detachably connected with the shell 11 by the plurality of fastening bolts 15, the plurality of counterbores 14 and the plurality of third threaded holes 56, the stability of the detection carrier 5 in the shell 11 is ensured, and the detection carrier 5 is facilitated to be disassembled and assembled, so that the maintenance or replacement of the detection carrier 5 is facilitated; the abutment of the first flat portion 55 and the inner bottom surface of the shell 11 can further ensure the mounting stability of the detection carrier 5.

[0036] As shown in Figure 4 and Figure 5 , in an optional embodiment of the present application, the gas detector further comprises: a second flat portion 58, the second flat portion 58 is arranged on the outer side of the detection carrier 5; a first air channel 581, the first air channel 581 is arranged on the second flat portion 58, the first air channel 581 is in communication with the discharge cavity 51, the outlet end of the first air inlet pipe 31 is inserted into the first air channel 581, and the outer wall of the first air inlet pipe 31 is filled with sealing glue between the port of the first air channel 581; a second air channel 582, the second air channel 582 is arranged on the second flat portion 58, the second air channel 582 is in communication with the detection cavity 53, the outlet end of the second air inlet pipe 32 is inserted into the second air channel 582, and the outer wall of the second air inlet pipe 32 is filled with sealing glue between the port of the second air channel 582. The third air channel 583 is arranged in the second plane part 58, and the third air channel 583 is communicated with the detection cavity 53. The air inlet end of the air outlet pipe 33 is inserted into the third air channel 583, and the outer wall of the air outlet pipe 33 and the port of the third air channel 583 are filled with sealing glue.

[0037] In this embodiment, the air outlet end of the first air inlet pipe 31 is inserted into the first air channel 581, the outer wall of the first air inlet pipe 31 and the port of the first air channel 581 are filled with sealing glue, the air outlet end of the second air inlet pipe 32 is inserted into the second air channel 582, the outer wall of the second air inlet pipe 32 and the port of the second air channel 582 are filled with sealing glue, and the air inlet end of the air outlet pipe 33 is inserted into the third air channel 583, the outer wall of the air outlet pipe 33 and the port of the third air channel 583 are filled with sealing glue, which can ensure the sealing between the first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33 and the detection carrier 5, and ensure the smooth injection of the carrier gas and the gas to be detected and the discharge of the mixed gas after detection.

[0038] The gas detector provided by the above-mentioned embodiments of the present application realizes the circular discharge of the carrier gas through the spherical electrode 44 and the needle-shaped electrode 45, and the products of the circular discharge of the carrier gas and the separated gas to be detected successively enter and cross the detector polarization plate 6 through the chromatographic column 7. The molecules of the gas to be detected and the products of the circular discharge of the carrier gas ionize the analyte through non-elastic collision, the formed positive and negative ions are collected by the polarization area of the detector polarization plate 6, and an electric current is formed. The electric current is transmitted to the gas chromatograph, and the electric current is proportional to the concentration of the analyte in the sample gas, so that the corresponding chromatogram is obtained. Through the gas chromatograph, the detection performance is high, the use cost is reduced, and the enterprise procurement cost is reduced. Through the plurality of screws, the plurality of first positioning holes 13 and the plurality of first threaded holes 16, the detachable connection of the cover plate 12 and the shell 11 can be realized, so that the maintenance of the detection carrier 5 inside the shell 11 is facilitated. Through the positioning plate 2 and the three limiting holes 22, the first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33 can be limited, so that the parts of the first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33 located in the shell 11 are in a vertical state, the first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33 are ensured to be smooth, so that the smooth injection of the carrier gas and the gas to be detected and the discharge of the mixed gas after detection are ensured. Through the first power connection column 46, the second power connection column 47, the first wire, the second wire, the first wire end 42 and the second wire end 43, the electric connection operation of the spherical electrode 44 and the needle-shaped electrode 45 and the power supply can be simplified. Through the third wire end 62 and the third wire, the electric connection of the detector polarization plate 6 and the gas chromatograph is facilitated, and the electric connection operation of the detector polarization plate 6 and the gas chromatograph is simplified.

[0039] The above is the preferred embodiment of the present application, it should be noted that for those skilled in the art, without departing from the principles described in the present application, can also be made several improvements and refinements, these improvements and refinements should also be considered the scope of protection of the present application.

Claims

1. A gas detector, characterized by, include: shell; The detection carrier (5) is disposed inside the outer shell. The detection carrier (5) has a discharge cavity (51), a conductive channel (52), a detection cavity (53) and a mounting cavity (54) formed sequentially inside. The discharge cavity (51), the conductive channel (52), the detection cavity (53) and the mounting cavity (54) are connected in sequence. A spherical electrode (44) and a needle-shaped electrode (45) are disposed in the discharge cavity (51), the spherical electrode (44) and the needle-shaped electrode (45) are disposed close to each other, and the spherical electrode (44) and the needle-shaped electrode (45) are electrically connected to the power supply. The first air inlet pipe (31) has an outlet end connected to the discharge chamber (51) to inject carrier gas into the discharge chamber (51). A chromatographic column (7) is disposed in the detection chamber (53); The detector polarization plate (6) is disposed in the mounting cavity (54), the polarization zone of the detector polarization plate (6) corresponds to the chromatographic column (7), and the detector polarization plate (6) is electrically connected to the gas chromatograph. The second air inlet pipe (32) has an outlet end connected to the detection chamber (53) to inject the gas to be detected into the detection chamber (53). The outlet end of the second air inlet pipe (32) is close to the connecting channel (52). An air outlet pipe (33) is provided, with its inlet end connected to the detection chamber (53), and its inlet end being far from the guiding channel (52).

2. The gas detector of claim 1, wherein, The outer casing includes: The housing (11) has an open structure on one side, and the detection carrier (5) is located inside the housing (11). The surface of the open structure of the housing (11) is provided with a plurality of first threaded holes (16). The cover plate (12) corresponds to the opening structure of the housing (11). The surface of the cover plate (12) is provided with a plurality of first positioning holes (13), which correspond to a plurality of first threaded holes (16). Multiple screws, the ends of which pass through multiple first positioning holes (13) respectively, and the ends of the multiple screws are threadedly connected to multiple first threaded holes (16) respectively.

3. The gas detector of claim 2, wherein, The outer casing also includes: The clearance groove (17) is provided through the upper surface of the housing (11), and the first air inlet pipe (31), the second air inlet pipe (32) and the air outlet pipe (33) all pass through the clearance groove (17).

4. The gas detector of claim 3, wherein, Also includes: Multiple support blocks (111) are formed on the upper surface of the housing (11), and multiple second threaded holes (112) are provided on the upper surface of each support block (111). The positioning plate (2) has a plurality of second positioning holes through its surface, and the plurality of second positioning holes correspond to a plurality of second threaded holes (112); A plurality of positioning bolts (21) have ends penetrating the plurality of second positioning holes respectively, and the ends of the plurality of positioning bolts (21) are threadedly connected in the plurality of second threaded holes (112) respectively; The positioning plate (2) is provided with three limiting holes (22) penetrating the surface thereof, and the three limiting holes (22) correspond to the first air inlet pipe (31), the second air inlet pipe (32) and the air outlet pipe (33) respectively, and the first air inlet pipe (31), the second air inlet pipe (32) and the air outlet pipe (33) penetrate the corresponding limiting holes (22) respectively.

5. The gas detector of claim 2, wherein, Further comprising: The discharge cavity (51) penetrates the first end surface of the detection carrier (5), and the first end surface of the detection carrier (5) is provided with a plurality of fourth threaded holes (57); A bearing plate (8) is provided with a plurality of connecting holes (81) penetrating the surface thereof, and the plurality of connecting holes (81) correspond to the plurality of fourth threaded holes (57) respectively; A plurality of connecting bolts (82) have ends penetrating the plurality of connecting holes (81) respectively, and the ends of the plurality of connecting bolts (82) are threadedly connected in the plurality of fourth threaded holes (57) respectively; A first power connection column (46) is embedded in the surface of the bearing plate (8), and a first end of the first power connection column (46) penetrates the bearing plate (8) and is connected with the spherical electrode (44); A second power connection column (47) is embedded in the surface of the bearing plate (8), and a first end of the second power connection column (47) penetrates the bearing plate (8) and is connected with the needle-shaped electrode (45).

6. The gas detector of claim 5, wherein, Further comprising: A first wire slot (18) is provided on the upper surface of the shell (11), and the first wire slot (18) is close to the discharge cavity (51); A first support (41) is connected with the shell (11), and the first support (41) is close to the discharge cavity (51); A first wire end (42) is provided on the first support (41), and the first wire end (42) is electrically connected with a second end of the first power connection column (46) through a first wire; A second wire end (43) is provided on the first support (41), and the second wire end (43) is electrically connected with a second end of the second power connection column (47) through a second wire; The first wire and the second wire penetrate the first wire slot (18).

7. The gas detector of claim 2, wherein, Further comprising: A limiting piece (9) is threadedly connected with the mounting cavity (54) at the end thereof, and the end of the limiting piece (9) abuts against the detector polarization plate (6), and a wire slot (91) is provided in the limiting piece (9).

8. The gas detector of claim 7, wherein, Further comprising: A second wire slot (19) is provided on the upper surface of the shell (11), and the second wire slot (19) is close to the mounting cavity (54). A second support (61) is connected with the shell (11), and the second support (61) is close to the installation cavity (54); A third terminal head (62) is arranged on the second support (61), and the third terminal head (62) is electrically connected with the detector polarization plate (6) through a third lead wire, and the third lead wire penetrates through the second lead wire slot (19).

9. The gas detector of claim 2, wherein, Further comprising: A plurality of counterbores (14) are arranged on the bottom surface of the shell (11); A first flat portion (55) is arranged on the outer side of the detection carrier (5), and the first flat portion (55) is in abutment with the inner bottom surface of the shell (11); A plurality of third threaded holes (56) are arranged on the surface of the first flat portion (55), and the plurality of third threaded holes (56) correspond to the plurality of counterbores (14) respectively; A plurality of fastening bolts (15) have ends penetrating through the plurality of counterbores (14) respectively, and the ends of the plurality of fastening bolts (15) are threadedly connected with the plurality of third threaded holes (56) respectively.

10. The gas detector of claim 1, wherein, Further comprising: A second flat portion (58) is arranged on the outer side of the detection carrier (5); A first air channel (581) is arranged on the second flat portion (58), the first air channel (581) is in communication with the discharge cavity (51), the gas outlet end of the first air inlet pipe (31) is inserted into the first air channel (581), and the outer wall of the first air inlet pipe (31) is filled with sealant between the port of the first air channel (581); A second air channel (582) is arranged on the second flat portion (58), the second air channel (582) is in communication with the detection cavity (53), the gas outlet end of the second air inlet pipe (32) is inserted into the second air channel (582), and the outer wall of the second air inlet pipe (32) is filled with sealant between the port of the second air channel (582); A third air channel (583) is arranged on the second flat portion (58), the third air channel (583) is in communication with the detection cavity (53), the gas inlet end of the air outlet pipe (33) is inserted into the third air channel (583), and the outer wall of the air outlet pipe (33) is filled with sealant between the port of the third air channel (583).

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