Faraday disc of ion mobility spectrometry receiving device with air holes

Abstract

The utility model provides a Faraday disc of an ion mobility spectrometry receiving device with air holes. The device comprises a Faraday disc, a hollow insulation column, a Faraday disc shielding cylinder and an insulation nut, the Faraday disc comprises a metal disc and a metal rod, the metal rod is inserted into the hollow insulation column, the metal rod is provided with an external thread matched with the insulation nut, and the tail end of the metal rod far away from the metal disc side is provided with a groove matched with a signal pin; one end of the hollow insulating column is inserted into the Faraday disc shielding cylinder, and the other end of the hollow insulating column isolates and insulates the Faraday disc and the Faraday disc shielding cylinder; the metal disc is provided with an air hole, and the Faraday disc shielding cylinder is provided with an air hole. According to the utility model, the metal disc is held and fixed through the socket spanner or the socket screwdriver and is matched with the insulating nut, and the Faraday disc is fixed on the Faraday disc shielding cylinder, so that reliable assembly of the Faraday disc and a drift gas channel are realized, and stable receiving and transmission of signals are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of ion mobility spectrum detection, in particular to a Faraday plate of an ion mobility spectrum receiving device with air holes. Background Art

[0002] Ion mobility spectrometry (IMS) is a technique that analyzes chemical substances by ionizing gas-phase molecules with an ionization source and analyzing the differences in the migration speeds of different gas-phase ions in the same electric field. It has been widely used for rapid on-site screening and detection of explosives, drugs, and toxic agents.

[0003] The ion mobility spectrometer migration tube needs to be airtight and high-temperature resistant, and remain clean and free of chemical emissions. The ion mobility spectrometer Faraday disk is responsible for receiving and transmitting extremely weak signals at the nanoampere level. Usually, the signal lead wires are welded, and welding connections will leave residual chemicals that are difficult to remove. Therefore, an assembly method that uses metal parts to match and insulating parts to isolate is often used. The firmness and reliability of the assembly method will directly affect the airtightness of the ion mobility tube, signal transmission, noise level, etc.

[0004] Li Haiyang and others invented an ion mobility spectrometry ion signal extraction and sealing device (Patent No. ZL201210536367.6). This is a sealed Faraday disk ion current signal extraction device, comprising a Faraday disk, a metal shielding tube, a hollow metal shielding adapter, an insulator, a hollow sealed insulating ferrule, a metal connecting nut, and a signal extraction connector. This device achieves good sealing and reliable microcurrent signal extraction, while preventing the Faraday disk from loosening due to heating, vibration, and other factors, as well as contact with the shielding grid. However, the trapezoidal sealing insulating ferrule softens and deforms during alternating hot and cold use, causing the Faraday disk to loosen and signal fluctuations, as well as reduced sealing and air leakage.

[0005] Li Haiyang et al. invented an ion receiving device for ion mobility spectrometry (patent number ZL201110428494.X). This device is a sealed Faraday disk microcurrent signal extraction device, comprising a Faraday disk, an O-ring, an insulating sealing pressure ring, a sealing nut, a ferrule, a gold-plated spring pin signal shielding lead-out wire, a compression nut, an adapter, a Faraday disk shielding tube, and a Faraday disk insulating gasket, etc., to achieve sealed and reliable microcurrent signal extraction and prevent failure caused by factors such as vibration and heating. However, the Faraday disk, annular Faraday disk insulating gasket, shielding tube, O-ring, and insulating sealing pressure ring are tightened and fastened by a sealing nut. The connection between the above components is circular and slidable. In particular, the Faraday disk is also circular in shape. Therefore, the circular Faraday disk and the sealing nut are difficult to tighten, and are prone to loosening during use, resulting in fluctuations or even loss of the collected signal.

[0006] In the ion mobility spectrometer migration tube, there is also drift gas flowing through the Faraday disk to provide a clean gas atmosphere, remove impurity gases and deionized sample molecules entering the ion mobility spectrometer migration area. Usually, the drift gas flows from the outside of the Faraday disk. When the Faraday disk is sealed with the insulating ring in front of the disk, the flow channel of the drift gas needs to be redesigned.

[0007] Therefore, there is an urgent need to design a Faraday plate of an ion mobility spectrometer receiving device with air holes that effectively improves the reliability of signal transmission and the drift gas flow channel. Utility Model Content

[0008] In response to the technical problems raised above, a Faraday disk of an ion mobility spectrometer receiving device with air holes is provided, which has the advantages of high signal transmission reliability, guaranteed airtightness, and unobstructed floating gas flow channels.

[0009] The technical means adopted by this utility model are as follows:

[0010] A Faraday disk of an ion mobility spectrometer receiving device with an air hole comprises a Faraday disk, a hollow insulating column, a Faraday disk shielding tube, and an insulating nut. The Faraday disk comprises a metal disk and a metal rod. The metal rod is inserted into the hollow insulating column. The metal rod is provided with an external thread that cooperates with the insulating nut. The end of the metal rod away from the metal disk is provided with a groove that cooperates with a signal pin. One end of the hollow insulating column is inserted into the Faraday disk shielding tube, and the other end isolates and insulates the Faraday disk from the Faraday disk shielding tube. The metal disk is provided with an air hole, and the Faraday disk shielding tube is provided with an air hole.

[0011] Furthermore, the number of the pores is 1-16, and the pore diameter is 0.6-3 mm; when there are multiple pores, they are evenly distributed on the metal plate.

[0012] Furthermore, the metal disk is a regular shape, and its cross-sectional area is greater than or equal to the cross-sectional area of ​​the metal rod.

[0013] Furthermore, the metal disk includes a hexagonal metal disk, an octagonal metal disk, a gear-shaped metal disk, and a quadrilateral metal disk.

[0014] Furthermore, the entire cross-section of the Faraday disk is T-shaped or the end of the T-shape is stepped, and the cross-section of the hollow insulating column is T-shaped.

[0015] Furthermore, the opposite side dimension of the metal disk is greater than or equal to the diameter of the large end of the hollow insulating column.

[0016] Furthermore, the minimum diameter of the hollow insulating column is less than or equal to the minimum diameter of the Faraday disk shielding cylinder.

[0017] Furthermore, the diagonal dimension of the metal plate of the Faraday plate is between 4 and 16 mm.

[0018] Furthermore, the metal disk of the Faraday disk is a gear-shaped metal disk, and the diameter of the tooth top circle thereof is 4-16 mm.

[0019] Furthermore, a sealing gasket is provided between the Faraday disk and the hollow insulating column, and / or between the hollow insulating column and the Faraday disk shielding tube; and it also includes an insulating ring in front of the disk, the bottom surface of the Faraday disk shielding tube is provided with a mounting groove, the metal disk can be installed in the insulating ring in front of the disk, and the top surface of the insulating ring in front of the disk is provided with a protrusion that matches the mounting groove.

[0020] The utility model provides a Faraday disk of an ion mobility spectrometer receiving device with an air hole, which is composed of a Faraday disk, a hollow insulating column, a Faraday disk shielding tube, and an insulating nut. The Faraday disk includes a metal disk and a metal rod. The metal rod is inserted into the hollow insulating column, has an external thread on the metal rod that cooperates with the insulating nut, and has a groove at the end of the metal rod that cooperates with a signal pin. One end of the hollow insulating column is inserted into the Faraday disk shielding tube, and the other end isolates and insulates the Faraday disk from the Faraday disk shielding tube. A hexagonal socket wrench or a hexagonal socket screwdriver grips the metal disk that fixes the T-shaped Faraday disk and cooperates with the insulating nut to fix the Faraday disk to the Faraday disk shielding tube, thereby achieving reliable assembly and sealing of the Faraday disk and ensuring stable signal reception and transmission. By providing air holes in the metal disk, reliable assembly of the Faraday disk and unobstructed air flow channels are achieved, thereby ensuring stable signal reception and transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 This is an assembly diagram of the Faraday disk for receiving ion mobility spectrometry signals in the present invention.

[0023] Figure 2 A front view of a Faraday plate of an ion mobility spectrometer receiving device with an air hole.

[0024] Figure 3 Schematic diagram of a Faraday plate of an ion mobility spectrometer receiving device with an air hole.

[0025] In the figure: 1. Insulating ring in front of the disk; 2. Faraday disk; 3. Hollow insulating column; 4. Faraday disk shielding tube; 5. Insulating nut; 6. Air hole. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are 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.

[0027] like Figures 1 to 3 As shown, an embodiment of the present invention discloses a Faraday disk of an ion mobility spectrometer receiving device with an air hole, comprising a Faraday disk 2, a hollow insulating column 3, a Faraday disk shielding tube 4, and an insulating nut 5. The Faraday disk comprises a metal disk and a metal rod, which can be formed by an integral molding process. The metal rod is inserted into the hollow insulating column, and is provided with an external thread that mates with the insulating nut. The end of the metal rod away from the metal disk is provided with a groove that mates with a signal pin. One end of the hollow insulating column is inserted into the Faraday disk shielding tube, and the other end isolates and insulates the Faraday disk from the Faraday disk shielding tube. The metal disk is provided with an air hole 6, and the Faraday disk shielding tube is provided with an air hole.

[0028] The Faraday disk shielding tube is a hollow structure. The Faraday disk shielding tube has a protrusion at one end close to the insulating nut. After the insulating nut is installed, it can fit with the protrusion. When installed, a T-shaped section of the hollow insulating column is arranged inside the Faraday disk shielding tube and the protrusion.

[0029] The number of the pores is 1-16, and the diameter of the pores is 0.6-3 mm. When there are multiple pores, they are evenly distributed on the metal plate.

[0030] During assembly, taking the hexagonal metal disk as an example, a hexagonal socket wrench or a hexagonal socket screwdriver is used to hold the hexagonal metal disk that fixes the T-type Faraday disk, and cooperates with the insulating nut to fix the T-type Faraday disk on the Faraday disk shielding tube to achieve reliable assembly and sealing of the Faraday disk.

[0031] The metal disk is a regular shape, and its cross-sectional area is greater than or equal to the cross-sectional area of ​​the metal rod.

[0032] The metal disk includes a hexagonal metal disk, an octagonal metal disk, a gear-shaped metal disk, and a quadrilateral metal disk.

[0033] The entire cross section of the Faraday disk is T-shaped or the end of the T-shape is stepped, and the cross section of the hollow insulating column is T-shaped.

[0034] The opposite side dimension of the metal disk is greater than or equal to the diameter of the large end of the hollow insulating column.

[0035] The minimum diameter of the hollow insulating column is less than or equal to the minimum diameter of the Faraday disk shielding tube.

[0036] The diagonal size of the metal plate of the Faraday disk is between 4 and 16 mm.

[0037] The metal disk of the Faraday disk is a gear-shaped metal disk, and the diameter of the tooth top circle thereof is 4-16 mm.

[0038] A sealing gasket is provided between the Faraday disk and the hollow insulating column, and / or between the hollow insulating column and the Faraday disk shielding tube; it also includes a front-disk insulating ring 1, the bottom surface of the Faraday disk shielding tube is provided with a mounting groove, the metal disk can be installed in the front-disk insulating ring, and the top surface of the front-disk insulating ring is provided with a protrusion that matches the mounting groove.

[0039] The materials of the hollow insulating column and the insulating nut include any one of peek, tetrafluoroethylene, ABS and polycarbonate.

[0040] Example 1

[0041] A Faraday disk of an ion mobility spectrometer receiving device with an air hole is composed of a T-shaped Faraday disk, a T-shaped hollow insulating column, a Faraday disk shielding tube and an insulating nut. The T-shaped Faraday disk includes a hexagonal metal disk and a metal rod. The metal rod is inserted into the T-shaped hollow insulating column. The metal rod has an external thread that cooperates with the insulating nut. The end of the metal rod has a groove that cooperates with a signal pin. One end of the T-shaped hollow insulating column is inserted into the Faraday disk shielding tube, and the other end isolates and insulates the T-shaped Faraday disk from the Faraday disk shielding tube. The metal disk is provided with air holes. A hexagonal socket wrench or a hexagonal socket screwdriver is used to hold the hexagonal metal disk that fixes the T-shaped Faraday disk, cooperates with the insulating nut, and fixes the T-shaped Faraday disk to the Faraday disk shielding tube, thereby achieving reliable assembly of the Faraday disk and unobstructed floating air passage.

[0042] The T-shaped hexagonal Faraday disk has pores distributed on the hexagonal metal disk. The pores are through-holes, the number of pores is 1, and the pore diameter is 3 mm.

[0043] The center of the hole of the T-shaped hexagonal Faraday disk with air holes is located on a circle with a diameter of 9 mm, which is greater than or equal to the maximum diameter of the T-shaped hollow insulating column of 6 mm;

[0044] The opposite side dimension of the hexagonal metal disk of the T-shaped hexagonal Faraday disk with air holes is 16 mm, which is larger than the inner diameter of the insulating ring in front of the disk, which is 17 mm.

[0045] The minimum diameter of the T-shaped hollow insulating column is 3, which is smaller than the minimum diameter of the Faraday disk shielding cylinder, which is 3.1;

[0046] The material of T-shaped hollow insulating column is PTFE, and the material of insulating nut is Peak;

[0047] The ion transfer tube equipped with this Faraday disk device has an airtightness and a pressure resistance greater than 0.15 MPa;

[0048] The drift air flow rate is adjustable between 0.3-4.0L / min, and the air resistance is less than 0.001Mpa;

[0049] Example 2

[0050] A Faraday disk for an ion mobility spectrometer receiving device with an air hole is composed of a T-shaped Faraday disk, a T-shaped hollow insulating column, a Faraday disk shielding tube, and an insulating nut. The T-shaped Faraday disk includes a hexagonal metal disk and a metal rod. The metal rod is inserted into the T-shaped hollow insulating column. The metal rod has an external thread that cooperates with the insulating nut, and the end of the metal rod has a groove that cooperates with a signal pin. One end of the T-shaped hollow insulating column is inserted into the Faraday disk shielding tube, and the other end isolates and insulates the T-shaped Faraday disk from the Faraday disk shielding tube. The hexagonal metal disk that fixes the T-shaped Faraday disk is gripped and fixed by a socket wrench or a socket screwdriver, which cooperates with the insulating nut to fix the T-shaped Faraday disk to the Faraday disk shielding tube, thereby achieving reliable assembly and sealing of the Faraday disk. The metal disk is provided with air holes.

[0051] The T-shaped hexagonal Faraday disk has 16 holes distributed on the hexagonal metal disk. The holes are continuous and the diameter of the holes is 0.6 mm.

[0052] The center of the hole of the T-shaped hexagonal Faraday disk with air holes is located on a circle with a diameter of 3.5 mm, which is greater than or equal to the maximum diameter of the T-shaped hollow insulating column of 3.2 mm;

[0053] The opposite side dimension of the hexagonal metal disk of the T-shaped hexagonal Faraday disk with air holes is 4 mm, which is larger than the inner diameter of the insulating ring in front of the disk, which is 3.9 mm.

[0054] The minimum diameter of the T-shaped hollow insulating column is 3, which is smaller than the minimum diameter of the Faraday disk shielding cylinder, which is 3.1;

[0055] The material of the T-shaped hollow insulating column is polycarbonate, and the material of the insulating nut is ABS plastic;

[0056] There are PTFE gaskets between the T-shaped porous hexagonal Faraday disk and the T-shaped hollow insulating column, and between the T-shaped hollow insulating column and the Faraday disk shielding cylinder for sealing;

[0057] The ion transfer tube equipped with this Faraday disk device has an airtightness and a pressure resistance greater than 0.15 MPa;

[0058] The drift air flow rate is adjustable between 0.3-2.0L / min, and the air resistance is less than 0.002Mpa;

[0059] Example 3

[0060] A Faraday disk of an ion mobility spectrometer receiving device with an air hole is composed of a T-shaped Faraday disk, a T-shaped hollow insulating column, a Faraday disk shielding tube and an insulating nut. The T-shaped Faraday disk includes an octagonal metal disk and a metal rod. The metal rod is inserted into the T-shaped hollow insulating column. The metal rod has an external thread that cooperates with the insulating nut. The end of the metal rod has a groove that cooperates with a signal pin. One end of the T-shaped hollow insulating column is inserted into the Faraday disk shielding tube, and the other end isolates and insulates the T-shaped Faraday disk from the Faraday disk shielding tube. A socket wrench or a socket screwdriver grips the octagonal metal disk that fixes the T-shaped Faraday disk and cooperates with the insulating nut to fix the T-shaped Faraday disk to the Faraday disk shielding tube, thereby achieving reliable assembly and sealing of the Faraday disk. The metal disk is provided with air holes.

[0061] The T-type Faraday disk is an octagonal metal disk;

[0062] The octagonal metal plate of the T-shaped octagonal Faraday plate has four holes distributed on it. The holes are through-holes and the diameter of the holes is 1.0 mm.

[0063] The center of the hole of the T-shaped octagonal Faraday disk with air holes is located on a circle with a diameter of 9 mm, which is greater than or equal to the maximum diameter of the T-shaped hollow insulating column of 8 mm;

[0064] The opposite side dimension of the octagonal metal disk of the T-shaped octagonal Faraday disk with air holes is 10 mm, which is larger than the inner diameter of the insulating ring in front of the disk, which is 9.8 mm.

[0065] The minimum diameter of the T-shaped hollow insulating column is 4, which is smaller than the minimum diameter of the Faraday disk shielding cylinder, which is 3.9;

[0066] The material of T-shaped hollow insulating column is polytetrafluoroethylene, and the material of insulating nut is Peak plastic;

[0067] The ion transfer tube equipped with this Faraday disk device has an airtightness and a pressure resistance greater than 0.15 MPa;

[0068] The drift air flow rate is adjustable between 0.3-2.5L / min, and the air resistance is less than 0.002Mpa;

[0069] Example 4

[0070] A Faraday disk for an ion mobility spectrometer receiving device with an air hole is composed of a T-shaped Faraday disk, a T-shaped hollow insulating column, a Faraday disk shielding tube, and an insulating nut. The T-shaped Faraday disk includes a quadrilateral metal disk and a metal rod. The metal rod is inserted into the T-shaped hollow insulating column. The metal rod has an external thread that cooperates with the insulating nut, and the end of the metal rod has a groove that cooperates with a signal pin. One end of the T-shaped hollow insulating column is inserted into the Faraday disk shielding tube, and the other end isolates and insulates the T-shaped Faraday disk from the Faraday disk shielding tube. A socket wrench or a socket screwdriver grips the quadrilateral metal disk that fixes the T-shaped Faraday disk and cooperates with the insulating nut to fix the T-shaped Faraday disk to the Faraday disk shielding tube, thereby achieving reliable assembly and sealing of the Faraday disk. The metal disk is provided with air holes.

[0071] The T-type Faraday disk is a quadrangular metal disk;

[0072] The T-shaped quadrangular Faraday disk with air holes comprises a quadrangular metal disk with air holes;

[0073] The T-shaped quadrangular Faraday disk has four holes distributed on the metal disk. The holes are through-holes and the diameter of the holes is 1.0 mm.

[0074] The center of the hole of the T-shaped quadrangular Faraday disk with air holes is located on a circle with a diameter of 9 mm, which is greater than or equal to the maximum diameter of the T-shaped hollow insulating column of 8 mm;

[0075] The opposite side dimension of the quadrilateral metal disk of the T-shaped quadrilateral Faraday disk with air holes is 10 mm, which is larger than the inner diameter of the insulating ring in front of the disk, which is 9.8 mm.

[0076] The minimum diameter of the T-shaped hollow insulating column is 4, which is smaller than the minimum diameter of the Faraday disk shielding cylinder, which is 3.9;

[0077] The material of T-shaped hollow insulating column is polytetrafluoroethylene, and the material of insulating nut is Peak plastic;

[0078] The ion transfer tube equipped with this Faraday disk device has an airtightness and a pressure resistance greater than 0.15 MPa;

[0079] The drift air flow rate is adjustable between 0.3-2.5L / min, and the air resistance is less than 0.002Mpa;

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A Faraday plate of an ion mobility spectrometer receiving device with an air hole, characterized in that: The invention comprises a Faraday disk, a hollow insulating column, a Faraday disk shielding tube and an insulating nut. The Faraday disk comprises a metal disk and a metal rod. The metal rod is inserted into the hollow insulating column. The metal rod is provided with an external thread that cooperates with the insulating nut. The end of the metal rod away from the metal disk is provided with a groove that cooperates with the signal pin. One end of the hollow insulating column is inserted into the Faraday disk shielding tube, and the other end isolates and insulates the Faraday disk from the Faraday disk shielding tube. The metal disk is provided with an air hole, and the Faraday disk shielding tube is provided with an air hole.

2. The Faraday disk of the ion mobility spectrometer receiving device with air holes according to claim 1, characterized in that: The number of the pores is 1-16, and the diameter of the pores is 0.6-3 mm. When there are multiple pores, they are evenly distributed on the metal plate.

3. The Faraday disk of the ion mobility spectrometer receiving device with air holes according to claim 1, characterized in that: The metal disk is a regular shape, and its cross-sectional area is greater than or equal to the cross-sectional area of ​​the metal rod.

4. The Faraday disk of the ion mobility spectrometer receiving device with air holes according to claim 1, characterized in that: The metal disk includes a hexagonal metal disk, an octagonal metal disk, a gear-shaped metal disk, and a quadrilateral metal disk.

5. The Faraday disk of the ion mobility spectrometer receiving device with air holes according to claim 1, characterized in that: The entire cross section of the Faraday disk is T-shaped or the end of the T-shape is stepped, and the cross section of the hollow insulating column is T-shaped.

6. The Faraday disk of the ion mobility spectrometer receiving device with air holes according to claim 1, characterized in that: The opposite side dimension of the metal disk is greater than or equal to the diameter of the large end of the hollow insulating column.

7. The Faraday disk of the ion mobility spectrometer receiving device with air holes according to claim 1, characterized in that: The minimum diameter of the hollow insulating column is less than or equal to the minimum diameter of the Faraday disk shielding tube.

8. The Faraday disk of the ion mobility spectrometer receiving device with air holes according to claim 1, characterized in that: The diagonal size of the metal plate of the Faraday disk is between 4 and 16 mm.

9. The Faraday disk of the ion mobility spectrometer receiving device with air holes according to claim 1, characterized in that: The metal disk of the Faraday disk is a gear-shaped metal disk, and the diameter of the tooth top circle thereof is 4-16 mm.

10. The Faraday disk of the ion mobility spectrometer receiving device with air holes according to claim 1, characterized in that: A sealing gasket is provided between the Faraday disk and the hollow insulating column, and / or between the hollow insulating column and the Faraday disk shielding tube; and the invention also includes an insulating ring in front of the disk, the bottom surface of the Faraday disk shielding tube is provided with a mounting groove, the metal disk can be installed in the insulating ring in front of the disk, and the top surface of the insulating ring in front of the disk is provided with a protrusion that matches the mounting groove.

Images