A gas detector

Abstract

The utility model provides a kind of gas detector, comprising: detection carrier is arranged in shell, discharge cavity, through channel, detection cavity and installation cavity are successively shaped in detection carrier inside, spherical electrode and needle electrode are arranged in discharge cavity, the outlet end of first air inlet pipe is communicated with discharge cavity, chromatographic column is arranged in detection cavity;Detector polarization plate is arranged in installation cavity, detector polarization plate is electrically connected with gas chromatograph;The outlet end of second air inlet pipe is communicated with detection cavity.The utility model's scheme is realized by spherical electrode and needle electrode that the annular discharge of carrier gas, the molecule of gas to be detected and the product of annular discharge of carrier gas ionization analyte after via inelastic collision, the formed anion and cation, polarization area of detector polarization plate is collected, and form current, current and the concentration of analyte inside sample gas are directly proportional, to obtain corresponding chromatogram;By carrying gas chromatograph, it can be better detected, and detection performance is high, and enterprise cost can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of gas detection technology, and in particular to a gas detector. Background Technology

[0002] The gas industry is a fundamental sector of the national economy. With the rapid development of the national economy, the gas industry, especially the high-purity and ultra-high-purity gas and electronic gas industries, has also flourished. The detection of trace impurities in gases is a key step in the production of high-purity gases and gases used in the electronics industry. However, the analysis of trace impurities in these gases has always been a challenge in chromatographic analysis, and existing chromatographic detectors such as thermal conductivity detectors cannot meet the requirements of high-purity gas analysis. Utility Model Content

[0003] This invention provides a gas detector that achieves ring discharge of the carrier gas through spherical and needle electrodes. Passing through a chromatographic column, the products of the ring discharge and the separated analyte gas successively enter and cross the detector polarization plate. The molecules of the analyte gas and the products of the ring discharge ionize the analyte through inelastic collisions. The resulting anions and cations are collected by the polarization zone of the detector polarization plate, forming a current. This current is transmitted to a gas chromatograph, and the current is proportional to the concentration of the analyte in the sample gas, thus obtaining the corresponding chromatogram. By integrating with a gas chromatograph, better detection is achieved, resulting in high detection performance and reduced operating and procurement costs for enterprises.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: A gas detector, comprising: shell; A detection carrier is disposed within the outer shell, and the detection carrier has a discharge cavity, a conductive channel, a detection cavity, and a mounting cavity sequentially formed inside the detection carrier, wherein the discharge cavity, the conductive channel, the detection cavity, and the mounting cavity are sequentially connected. The spherical electrode and the needle electrode are disposed in the discharge cavity, and are arranged close to each other. The spherical electrode and the needle electrode are electrically connected to the power supply. A first air inlet pipe, the outlet of which is connected to the discharge cavity to inject carrier gas into the discharge cavity; A chromatographic column, wherein the chromatographic column is disposed in the detection chamber; A detector polarization plate is disposed within the mounting cavity, the polarization region of the detector polarization plate corresponds to the chromatographic column, and the detector polarization plate is electrically connected to the gas chromatograph. The second air inlet pipe has an outlet end connected to the detection chamber to inject the gas to be detected into the detection chamber, and the outlet end of the second air inlet pipe is close to the conductive channel. An air outlet pipe is provided, with its inlet end connected to the detection chamber and its inlet end located away from the conductive channel.

[0005] Optionally, the housing includes: The housing has an open structure on one side, and the detection carrier is located inside the housing. The surface of the open structure of the housing is provided with a plurality of first threaded holes. A cover plate, which corresponds to the opening structure of the housing, and a plurality of first positioning holes are provided through the surface of the cover plate, each of the plurality of first positioning holes corresponding to a plurality of first threaded holes; Multiple screws, the ends of which pass through multiple first positioning holes, and the ends of which are threaded into multiple first threaded holes.

[0006] Optionally, the housing further includes: An obstacle clearance groove is provided through the upper surface of the housing, and the first air inlet pipe, the second air inlet pipe and the air outlet pipe all pass through the obstacle clearance groove.

[0007] Optionally, the gas detector further includes: Multiple support blocks are formed on the upper surface of the housing, and each support block has multiple second threaded holes on its upper surface. A positioning plate, wherein a plurality of second positioning holes are provided through the surface of the positioning plate, and the plurality of second positioning holes correspond to a plurality of second threaded holes respectively; Multiple positioning bolts, the ends of which pass through multiple second positioning holes, and the ends of which are threadedly connected to multiple second threaded holes. The positioning plate has three limiting holes through its surface. The three limiting holes correspond 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 pass through the corresponding limiting holes.

[0008] Optionally, the gas detector further includes: The discharge cavity penetrates the first end face of the detection carrier, and the first end face of the detection carrier is provided with a plurality of fourth threaded holes; A support plate, wherein a plurality of connecting holes are provided through the surface of the support plate, and the plurality of connecting holes correspond to a plurality of fourth threaded holes respectively; Multiple connecting bolts, with the ends of the multiple connecting bolts passing through multiple connecting holes, and the ends of the multiple connecting bolts being threadedly connected to multiple fourth threaded holes respectively; The first electrode post is embedded in the surface of the support plate, and the first end of the first electrode post penetrates the support plate and is connected to the spherical electrode. The second electrode post is embedded in the surface of the support plate, and the first end of the second electrode post penetrates the support plate and is connected to the needle electrode.

[0009] Optionally, the gas detector further includes: The first wire-passing groove extends through the upper surface of the housing and is located near the discharge cavity. A first support is connected to the housing and is located near the discharge cavity; The first terminal is disposed on the first bracket and is electrically connected to the second end of the first terminal post through a first wire. The second terminal is disposed on the first bracket and is electrically connected to the second end of the second terminal post through a second wire; The first conductor and the second conductor pass through the first wire groove.

[0010] Optionally, the gas detector further includes: A limiting member is provided, the end of which is threadedly connected to the mounting cavity, the end of which abuts against the detector polarization plate, and a wire-passing cavity is provided inside the limiting member.

[0011] Optionally, the gas detector further includes: The second wire-passing groove extends through the upper surface of the housing and is located near the mounting cavity. The second bracket is connected to the housing and is located near the mounting cavity; The third terminal is mounted on the second bracket and is electrically connected to the detector polarization plate via a third wire, which passes through the second wire slot.

[0012] Optionally, the gas detector further includes: Multiple countersunk holes are provided through the bottom surface of the housing; A first planar portion is disposed on the outer side of the detection carrier, and the first planar portion abuts against the inner bottom surface of the housing; Multiple third threaded holes are disposed on the surface of the first planar portion, and the multiple third threaded holes correspond to multiple countersunk holes 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 this utility model has at least the following beneficial effects: The above-described solution of this utility model achieves ring discharge of the carrier gas through spherical and needle electrodes. After 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, the detection performance is high, and the operating cost and enterprise procurement cost can be reduced. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of the gas detector provided in an embodiment of this utility model; Figure 2 This is a front sectional view of the gas detector provided in an embodiment of this utility model; 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 this utility model; Figure 5 This is a schematic diagram of the structure of the housing in the gas detector provided in an embodiment of this utility model; Figure 6 This is a schematic diagram of the structure of the detection carrier in the gas detector provided in an embodiment of this utility model.

[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 present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present 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 this utility model 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; 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. 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 conduction channel 52. The air outlet pipe 33 has an air inlet end connected to the detection chamber 53, and the air inlet end of the air outlet pipe 33 is far away from the conduction channel 52.

[0019] In this embodiment, the spherical electrode 44 and needle electrode 45 are electrically connected to a power supply; the inlet end of the first inlet pipe 31 is connected to a carrier gas supply device; the inlet end of the second inlet pipe 32 is connected to a gas supply device; the outlet end of the outlet pipe 33 is connected to a gas collection device; and the detector polarization plate 6 is electrically connected to a gas chromatograph. Carrier gas is injected into the discharge chamber 51 through the first inlet pipe 31, and annular discharge of the carrier gas is achieved through the spherical electrode 44 and needle electrode 45. The products of the annular discharge of the carrier gas enter the detection chamber 53 through the gas guide channel, and the gas to be detected is injected into the detection chamber through the second inlet pipe 32. 53. The products of the carrier gas annular discharge and the gas to be detected pass through the chromatographic column 7. The products of the carrier gas annular discharge and the separated gas to be detected successively enter and cross the detector polarization plate 6. The molecules of the gas to be detected and the products of the carrier gas annular discharge ionize the analytes after inelastic collisions. The resulting anions and cations are collected by the polarization zone of the detector polarization plate 6 and form a current. This current is transmitted to the gas chromatograph. The current is proportional to the concentration of the analyte in the sample gas, thereby obtaining the corresponding chromatogram. By using a gas chromatograph, better detection can be achieved, the detection performance is high, and the operating cost and enterprise procurement cost can be reduced. In practical applications, the carrier gas can be helium.

[0020] like Figure 1 and Figure 5 As shown, in an optional embodiment of the present invention, the outer shell 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. A plurality of first positioning holes 13 are provided through the surface of the cover plate 12, and the plurality of first positioning holes 13 correspond to a plurality of first threaded holes 16 respectively. Multiple screws, the ends of which pass through multiple first positioning holes 13, and the ends of which are threaded into multiple first threaded holes 16.

[0021] In this embodiment, the cover plate 12 and the housing 11 can be detachably connected by multiple screws, multiple first positioning holes 13 and multiple first threaded holes 16, which facilitates the maintenance of the detection carrier 5 inside the housing 11.

[0022] like Figure 5 As shown, in an optional embodiment of the present invention, the outer casing further 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.

[0023] In this embodiment, by providing the clearance groove 17, the first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33 can pass through the housing 11, ensuring the smooth injection of carrier gas and gas to be tested and the discharge of the mixed gas after testing.

[0024] like Figure 1 , Figure 2 and Figure 5 As shown, in an optional embodiment of the present invention, the gas detector further 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. Positioning plate 2, with multiple second positioning holes through the surface of positioning plate 2, the multiple second positioning holes corresponding to multiple second threaded holes 112 respectively; Multiple positioning bolts 21, the ends of the multiple positioning bolts 21 respectively pass through multiple second positioning holes, and the ends of the multiple positioning bolts 21 are respectively threaded to multiple second threaded holes 112. The surface of the positioning plate 2 is provided with three limiting holes 22, which correspond to the first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33 respectively. The first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33 pass through the corresponding limiting holes 22 respectively.

[0025] In this embodiment, the positioning plate 2 is detachably connected to the multiple support blocks 111 by multiple positioning bolts 21, multiple second positioning holes and multiple second threaded holes 112. The positioning plate 2 and the three limiting holes 22 can limit the first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33, ensuring that the parts of the first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33 located inside the housing 11 are in a vertical state, ensuring that the first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33 are unobstructed, thereby ensuring the smooth injection of carrier gas and gas to be tested and the discharge of the mixed gas after testing.

[0026] like 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 this embodiment, the first terminal 42 and the second terminal 43 are fixed by the first bracket 41, and the first terminal 42 is electrically connected to the first terminal 46 by the first wire. Thus, the ball electrode 44 is easily electrically connected to the power supply through the first terminal 42, the first wire and the first terminal 46. The second wire enables the electrical connection between the second terminal 43 and the second terminal 47, thereby facilitating the electrical connection between the needle electrode 45 and the power supply through the second terminal 43, the second wire, and the second terminal 47. The first wire groove 18 facilitates the passage of the first wire and the second guide through the housing 11; The first terminal 46, the second terminal 47, the first wire, the second wire, the first terminal 42, and the second terminal 43 simplify the electrical connection operation between the ball electrode 44 and the needle electrode 45 and the power supply; wherein, the first terminal 42 and the second terminal 43 can be plugs such as quick-connect plugs that enable quick connection.

[0030] like Figure 4 As shown, in an optional embodiment of the present invention, the gas detector further includes: The limiting member 9 has its end threadedly connected to the mounting cavity 54 and its end abutting against the detector polarization plate 6. A wire-passing cavity 91 is provided inside the limiting member 9.

[0031] In this embodiment, the limiting member 9 is threadedly connected to the mounting cavity 54, which facilitates the limiting member 9 to limit and fix the detector polarization plate 6 in the mounting cavity 54, so that the detector polarization plate 6 is stably set in the mounting cavity 54 and the polarization zone of the detector polarization plate 6 is accurately aligned with the chromatographic column 7 to ensure detection accuracy; the wiring cavity 91 facilitates the electrical connection between the detector polarization plate 6 and the gas chromatograph.

[0032] like Figure 5 As shown, in an optional embodiment of the present invention, the gas detector further includes: The second wire-passing groove 19 is disposed through the upper surface of the housing 11 and is close to the mounting cavity 54. The second bracket 61 is connected to the housing 11 and is close to the mounting cavity 54. The third terminal 62 is mounted on the second bracket 61. The third terminal 62 is electrically connected to the detector polarization plate 6 via a third wire, which passes through the second wire groove 19.

[0033] In this embodiment, the third terminal 62 is fixed by the second bracket 61, and the third wire is used to connect the third terminal 62 to the detector polarization plate 6. The third terminal 62 and the third wire facilitate the electrical connection between the detector polarization plate 6 and the gas chromatograph, simplifying the electrical connection operation between the detector polarization plate 6 and the gas chromatograph. The third terminal 62 can be a quick-connect plug or other plug that enables rapid connection.

[0034] like Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, in an optional embodiment of the present invention, the gas detector further includes: Multiple countersunk holes 14 are provided through the bottom surface of the housing 11; The first flat portion 55 is disposed on the outside of the detection carrier 5 and abuts against the inner bottom surface of the housing 11. Multiple third threaded holes 56 are provided on the surface of the first flat portion 55, and the multiple third threaded holes 56 correspond to multiple countersunk holes 14 respectively. Multiple fastening bolts 15, the ends of which pass through multiple countersunk holes 14, and the ends of the multiple fastening bolts 15 are threadedly connected to multiple third threaded holes 56.

[0035] In this embodiment, the detection carrier 5 and the housing 11 are detachably connected by multiple fastening bolts 15, multiple countersunk holes 14 and multiple third threaded holes 56, which ensures the stability of the detection carrier 5 in the housing 11 and facilitates the disassembly and assembly of the detection carrier 5, thereby facilitating the maintenance or replacement of the detection carrier 5; the contact between the first flat part 55 and the inner bottom surface of the housing 11 further ensures the installation stability of the detection carrier 5.

[0036] like Figure 4 and Figure 5 As shown, in an optional embodiment of the present invention, the gas detector further includes: The second planar portion 58 is disposed on the outer side of the detection carrier 5; The first air passage 581 is disposed on the second flat part 58. The first air passage 581 is connected to the discharge cavity 51. The outlet end of the first air inlet pipe 31 is inserted into the first air passage 581. The space between the outer wall of the first air inlet pipe 31 and the port of the first air passage 581 is filled with sealant. The second air passage 582 is provided in the second flat part 58 and is connected to the detection chamber 53. The outlet end of the second air inlet pipe 32 is inserted into the second air passage 582 and the space between the outer wall of the second air inlet pipe 32 and the port of the second air passage 582 is filled with sealant. The third air passage 583 is disposed on the second flat part 58 and is connected to the detection chamber 53. The air inlet end of the air outlet pipe 33 is inserted into the third air passage 583, and the space between the outer wall of the air outlet pipe 33 and the port of the third air passage 583 is filled with sealant.

[0037] In this embodiment, the outlet end of the first air inlet pipe 31 is inserted into the first air passage 581, and sealant is filled between the outer wall of the first air inlet pipe 31 and the port of the first air passage 581. The outlet end of the second air inlet pipe 32 is inserted into the second air passage 582, and sealant is filled between the outer wall of the second air inlet pipe 32 and the port of the second air passage 582. The inlet end of the outlet pipe 33 is inserted into the third air passage 583, and sealant is filled between the outer wall of the outlet pipe 33 and the port of the third air passage 583. This ensures the sealing between the first air inlet pipe 31, the second air inlet pipe 32, and the outlet pipe 33 and the detection carrier 5, ensuring the smooth injection of carrier gas and gas to be detected, as well as the discharge of the mixed gas after detection.

[0038] The gas detector provided in the above embodiments of this utility model achieves ring discharge of the carrier gas through a spherical electrode 44 and a needle electrode 45. Passing through the chromatographic column 7, the products of the ring discharge of the carrier gas and the separated target gas successively enter and cross the detector polarization plate 6. 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 6 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, with high detection performance, reducing operating costs and lowering enterprise procurement costs. Multiple screws, multiple first positioning holes 13, and multiple first threaded holes 16 enable a detachable connection between the cover plate 12 and the housing 11, facilitating access to the interior of the housing 11. The detection carrier 5 of the part is maintained and repaired; the positioning plate 2 and the three limiting holes 22 can limit the first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33, ensuring 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 housing 11 are in a vertical state, ensuring that the first air inlet pipe 31, the second air inlet pipe 32 and the air outlet pipe 33 are unobstructed, thereby ensuring the smooth injection of carrier gas and gas to be detected and the discharge of mixed gas after detection; the first electrical connection post 46, the second electrical connection post 47, the first wire, the second wire, the first terminal 42 and the second terminal 43 can simplify the electrical connection operation between the spherical electrode 44 and the needle electrode 45 and the power supply; the third terminal 62 and the third wire facilitate the electrical connection between the detector polarization plate 6 and the gas chromatograph, simplifying the electrical connection operation between the detector polarization plate 6 and the gas chromatograph.

[0039] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A gas detector, characterized in that, 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 according to claim 1, characterized in that, 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 according to claim 2, characterized in that, 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 according to claim 3, characterized in that, 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); Multiple positioning bolts (21), the ends of the multiple positioning bolts (21) respectively pass through multiple second positioning holes, and the ends of the multiple positioning bolts (21) are respectively threaded into multiple second threaded holes (112); The positioning plate (2) has three limiting holes (22) through it. 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. The first air inlet pipe (31), the second air inlet pipe (32) and the air outlet pipe (33) pass through the corresponding limiting holes (22).

5. The gas detector according to claim 2, characterized in that, Also 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) have their ends passing through multiple connecting holes (81) respectively, and their ends are threaded into multiple fourth threaded holes (57) respectively. The first terminal (46) is embedded in the surface of the support plate (8), and the first end of the first terminal (46) penetrates the support plate (8) and is connected to the spherical electrode (44). The second electrical terminal (47) is embedded in the surface of the support plate (8), and the first end of the second electrical terminal (47) penetrates the support plate (8) and is connected to the needle electrode (45).

6. The gas detector according to claim 5, characterized in that, Also 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 (46) via a first wire. The second terminal (43) is disposed on the first bracket (41) and is electrically connected to the second end of the second terminal (47) through the second wire; The first conductor and the second conductor pass through the first wire groove (18).

7. The gas detector according to claim 2, characterized in that, Also includes: The limiting member (9) has its end threadedly connected to the mounting cavity (54), and its end abuts against the detector polarization plate (6). A wire-passing cavity (91) is provided inside the limiting member (9).

8. The gas detector according to claim 7, characterized in that, Also includes: The second wire groove (19) is disposed through the upper surface of the housing (11) and is close to the mounting cavity (54). The second bracket (61) is connected to the housing (11) and is close to the mounting cavity (54). The third terminal (62) is disposed on the second bracket (61). The third terminal (62) is electrically connected to the detector polarization plate (6) through a third wire. The third wire passes through the second wire groove (19).

9. The gas detector according to claim 2, characterized in that, Also includes: Multiple countersunk holes (14) are provided through the bottom surface of the housing (11); The first flat portion (55) is disposed on the outside of the detection carrier (5) and abuts against the inner bottom surface of the housing (11). Multiple third threaded holes (56) are provided on the surface of the first planar portion (55), and the multiple third threaded holes (56) correspond to multiple countersunk holes (14) respectively; Multiple fastening bolts (15) are provided, with the ends of the multiple fastening bolts (15) passing through multiple countersunk holes (14) respectively, and the ends of the multiple fastening bolts (15) being threadedly connected to multiple third threaded holes (56) respectively.

10. The gas detector according to claim 1, characterized in that, Also includes: The second planar portion (58) is disposed on the outside of the detection carrier (5); The first air passage (581) is disposed in the second flat part (58). The first air passage (581) is connected to the discharge cavity (51). The outlet end of the first air inlet pipe (31) is inserted into the first air passage (581). The outer wall of the first air inlet pipe (31) and the port of the first air passage (581) are filled with sealant. The second air passage (582) is disposed in the second flat part (58). The second air passage (582) is connected to the detection chamber (53). The outlet end of the second air inlet pipe (32) is inserted into the second air passage (582). The outer wall of the second air inlet pipe (32) and the port of the second air passage (582) are filled with sealant. The third air passage (583) is disposed in the second flat part (58) and is connected to the detection chamber (53). The air inlet end of the air outlet pipe (33) is inserted into the third air passage (583). The outer wall of the air outlet pipe (33) and the port of the third air passage (583) are filled with sealant.

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