Faraday disc device for receiving fixed ion mobility spectrometry signal

Abstract

The utility model provides a fixed Faraday disc device for receiving ion mobility spectrometry signals, which comprises a disc front insulating ring, a Faraday disc, a metal fixing disc, an insulating cylinder, a metal cylinder, an insulating pad, a Faraday disc shielding cylinder and a fixing bolt, the Faraday disc comprises a metal disc and a metal rod, the metal rod is inserted into the metal cylinder, the insulating cylinder is sleeved outside the metal cylinder, and the insulating pad is sleeved outside the metal cylinder. A hole allowing the insulating cylinder to pass through and a hole allowing the fixing bolt to pass through are formed in the middle of the metal fixing disc, blind holes allowing the fixing bolt to be installed are formed in the inner wall of the Faraday disc shielding cylinder, the metal fixing disc and the Faraday disc shielding cylinder are installed through the fixing bolt, and an insulating pad is arranged between the metal fixing disc and the Faraday disc shielding cylinder. The bottom end of the Faraday disc shielding cylinder is provided with a slot, the disc front insulating ring is connected with the slot, and one end of the metal fixing disc away from the Faraday disc is provided with a signal joint end. Reliable assembly of the Faraday disc, airtightness of the migration tube and smoothness of the drift gas channel can be 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 disk device for receiving fixed ion mobility spectrum signals. 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] In the ion mobility spectrometer migration tube, the ion mobility spectrometer Faraday disk is responsible for receiving and transmitting extremely weak signals at the nanoampere level. The signal is transmitted to the signal processing device amplifier through the Faraday disk, metal connection components, signal connector end, signal connector and signal line in sequence. In addition, the Faraday disk and its fixing device also ensure the airtightness of the ion mobility tube. Therefore, the structure and assembly method of the signal receiving Faraday disk and its fixing device, its firmness and reliability, will directly affect the signal transmission reliability, noise level and airtightness of the ion mobility tube.

[0004] 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.

[0005] An ion mobility spectrometry ion signal extraction and sealing device invented by Li Haiyang et al. (Patent No. ZL201210536367.6) is a Faraday disk ion current signal extraction device with a sealing function. It includes 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. It is designed to achieve good sealing and reliable microcurrent signal extraction, and prevent the Faraday disk from loosening and contact with the shielding grid caused by factors such as heating and vibration. However, its trapezoidal sealed insulating ferrule will soften and deform during alternating hot and cold use, causing the Faraday disk to loosen and signal fluctuations, and also resulting in reduced sealing and air leakage. Therefore, there is an urgent need to design a fixed ion mobility spectrometry signal receiving Faraday disk device that effectively improves signal transmission reliability, noise level, and airtight sealing. Utility Model Content

[0006] In response to the above-mentioned technical problems, a Faraday disk device for receiving fixed ion mobility spectrometry signals is provided, which has the advantages of high signal transmission reliability and good airtightness. The technical means adopted by the utility model are as follows:

[0007] A Faraday disk device for receiving fixed ion mobility spectrometry signals includes a front-disk insulating ring, a Faraday disk, a metal fixed disk, an insulating tube, a metal tube, an insulating pad, a Faraday disk shielding tube and a fixing bolt. The Faraday disk includes a metal disk and a metal rod. The metal rod is inserted into the metal tube, and the outside of the metal tube is sleeved with the insulating tube. A hole for the insulating tube to pass through is provided in the middle of the metal fixed disk, and a hole for the fixing bolt to pass through is also provided on it. The inner wall of the Faraday disk shielding tube is provided with a blind hole for installing the fixing bolt. The metal fixed disk and the Faraday disk shielding tube are installed by fixing bolts. An insulating pad is provided between the metal fixed disk and the Faraday disk shielding tube. The metal fixed disk is provided inside the Faraday disk shielding tube. The bottom end of the Faraday disk shielding tube is provided with a slot. The top surface of the front-disk insulating ring is provided with a protrusion that matches the slot. The end of the metal fixed disk away from the Faraday disk is provided with a signal connector end.

[0008] 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.

[0009] Furthermore, the metal disk includes a hexagonal metal disk, an octagonal metal disk, a circular metal disk, and a quadrilateral metal disk.

[0010] Furthermore, the overall cross-section of the Faraday disk is T-shaped, and the cross-section of the metal fixing disk is also T-shaped.

[0011] Furthermore, the diagonal dimension of the metal disk is between 4-16 mm or the diameter is between 4-16 mm.

[0012] Furthermore, the distance between the Faraday disk and the end surface of the insulating ring in front of the disk is 0.2-5 mm.

[0013] Furthermore, the metal plate has no fixing through holes, or has 2-4 fixing through holes distributed thereon, allowing fixing bolts to pass through.

[0014] Furthermore, the metal rod is inserted into the metal cylinder and fixed by welding, or the metal rod and the metal cylinder are processed into an integrated component.

[0015] Furthermore, the distance between the end face of the insulating tube and the end face of the through hole of the T-shaped metal fixing plate is 0.2-1.2 mm.

[0016] Furthermore, a floating air hole is provided on the Faraday disk shielding tube.

[0017] The utility model provides a fixed Faraday disk device for receiving ion mobility spectrometry signals. By adjusting the thickness of the insulating pad, the distance between the Faraday disk and the end face of the insulating ring in front of the disk is controlled. The overall structure is compact, and reliable assembly of the Faraday disk, airtightness of the migration tube, and unobstructed drift gas channels can be achieved, thereby ensuring stable signal reception and transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 This is an exploded diagram of the Faraday disk for receiving ion mobility spectrometry signals in the utility model.

[0020] Figure 2 This is an exploded view of a Faraday disk for receiving ion mobility spectrometry signals according to another embodiment of the present invention.

[0021] Figure 3 This is the structural assembly diagram of the Faraday disk for receiving ion mobility spectrometry signals in the utility model.

[0022] Figure 4 This is a front view of the Faraday disk and its fixing device for receiving ion mobility spectrometry signals of the utility model.

[0023] In the figure: 1. Insulating ring in front of the disk; 2. Faraday disk; 3. Metal fixing disk; 4. Insulating tube; 5. Metal tube; 6. Insulating pad; 7. Threaded hole; 8. Fixing bolt; 9. Air hole; 10. Faraday disk shielding tube. DETAILED DESCRIPTION

[0024] 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.

[0025] like Figures 1 to 4 As shown, an embodiment of the present invention discloses a Faraday disk device for receiving fixed ion mobility spectrometry signals, comprising a front-disk insulating ring 1, a Faraday disk 2, a metal fixed disk 3, an insulating tube 4, a metal tube 5, an insulating pad 6, a Faraday disk shielding tube 10 and a fixing bolt 8. The Faraday disk comprises a metal disk and a metal rod, the metal rod is inserted into the metal tube, the outer portion of the metal tube is sleeved with the insulating tube, a hole is provided in the middle of the metal fixed disk for the insulating tube to pass through, and a hole is also provided on it for the fixing bolt to pass through, a threaded blind hole 7 is provided on the inner wall of the Faraday disk shielding tube for installing the fixing bolt, the metal fixed disk is installed with the Faraday disk shielding tube by the fixing bolt, an insulating pad is provided between the metal fixed disk and the Faraday disk shielding tube, the metal fixed disk is provided inside the Faraday disk shielding tube, the bottom end of the Faraday disk shielding tube is provided with a slot, the top surface of the front-disk insulating ring is provided with a protrusion that matches the slot, and a signal connector end is provided at the end of the metal fixed disk away from the Faraday disk. The Faraday disk shielding cylinder is provided with a hollow through hole for the T-shaped protruding end of the metal fixing disk to extend out.

[0026] The signal connector end on the metal fixed disk is connected to a matching signal connector and signal line. The signal received by the Faraday disk is transmitted to the signal processing device through the metal rod, metal cylinder, signal connector end, signal connector and signal line.

[0027] By adjusting the thickness of the insulating pad, the distance between the Faraday disk and the end face of the insulating ring in front of the disk is controlled.

[0028] 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.

[0029] The metal disk includes a hexagonal metal disk, an octagonal metal disk, a circular metal disk, and a quadrilateral metal disk.

[0030] The entire cross section of the Faraday disk is T-shaped, and the cross section of the metal fixed disk is T-shaped.

[0031] The diagonal dimension of the metal disk is between 4-16 mm or the diameter is between 4-16 mm.

[0032] The distance between the Faraday disk and the end face of the insulating ring in front of the disk is 0.2-5 mm.

[0033] On the metal plate, Figure 1 As shown, there is no through hole for fixing, or as Figure 2 As shown, there are 2-4 fixing through holes distributed to allow fixing bolts to pass through.

[0034] The metal rod is inserted into the metal cylinder and fixed by welding, or the metal rod and the metal cylinder are processed into an integrated component.

[0035] The distance between the end face of the insulating tube and the end face of the through hole of the T-shaped metal fixing plate is 0.2-1.2 mm, that is, the distance that the insulating tube protrudes from the end face of the T-shaped metal fixing plate after installation.

[0036] The Faraday disk shielding tube is provided with a floating air hole.

[0037] Example 1

[0038] A fixed Faraday disk device for ion mobility spectrometry signal reception comprises a front-disk insulating ring, a T-shaped Faraday disk, a T-shaped metal fixing disk, an insulating cylinder, a metal cylinder, an insulating pad, a Faraday disk shielding cylinder, and fixing bolts. The T-shaped Faraday disk comprises a metal disk and a metal rod. The T-shaped metal fixing disk has a hollow through-hole, a fixing through-hole, and a signal connector end. The Faraday disk shielding cylinder has a hollow through-hole, a threaded hole, and an air vent.

[0039] The metal rod of the T-shaped Faraday disk is inserted into the metal tube and welded to fix it. The metal tube is inserted into the insulating tube and tightly fits. The insulating tube is then embedded in the through hole of the T-shaped metal fixing disk to control the distance between the end face of the insulating tube and the end face of the through hole of the T-shaped metal fixing disk.

[0040] The signal connector end on the T-shaped metal fixing plate is connected to the matching signal connector and signal line;

[0041] The T-shaped metal fixing plate, the insulating pad and the Faraday plate shielding tube are fixed by fixing bolts;

[0042] Adjust the thickness of the insulating pad to control the distance between the T-shaped Faraday disk and the end face of the insulating ring in front of the disk;

[0043] The signal received by the Faraday disk is transmitted to the signal processing device through the metal rod, the metal cylinder, the signal connector end, the signal connector and the signal line;

[0044] The metal disk of the T-type Faraday disk is circular;

[0045] The metal disk of the T-type Faraday disk has a diameter of 4 mm;

[0046] There are no through holes for fixing on the hexagonal metal disk on the T-type Faraday disk;

[0047] The metal rod of the T-shaped Faraday disk is inserted into the metal cylinder and welded to fix it;

[0048] The distance between the end face of the insulating tube and the end face of the through hole of the T-shaped metal fixing plate is 0.2;

[0049] The distance between the T-shaped Faraday disk and the end face of the insulating ring in front of the disk is 5 mm;

[0050] The Faraday disk and its fixing device for ion mobility spectrometry signal reception can realize the reliable assembly of the Faraday disk, the airtightness of the migration tube and the unobstructed drift gas channel, thereby ensuring stable signal reception and transmission.

[0051] The ion transfer tube equipped with the Faraday disk device has an airtightness and a pressure resistance greater than 0.18 MPa;

[0052] Example 2

[0053] A fixed Faraday disk device for ion mobility spectrometry signal reception comprises a front-disk insulating ring, a T-shaped Faraday disk, a T-shaped metal fixing disk, an insulating cylinder, a metal cylinder, an insulating pad, a Faraday disk shielding cylinder, and fixing bolts. The T-shaped Faraday disk comprises a metal disk and a metal rod. The T-shaped metal fixing disk has a hollow through-hole, a fixing through-hole, and a signal connector end. The Faraday disk shielding cylinder has a hollow through-hole, a threaded hole, and an air vent.

[0054] The metal rod of the T-shaped Faraday disk is inserted into the metal tube and welded to fix it. The metal tube is inserted into the insulating tube and tightly fits. The insulating tube is then embedded in the through hole of the T-shaped metal fixing disk to control the distance between the end face of the insulating tube and the end face of the through hole of the T-shaped metal fixing disk.

[0055] The signal connector end on the T-shaped metal fixing plate is connected to the matching signal connector and signal line;

[0056] The T-shaped metal fixing plate, the insulating pad and the Faraday plate shielding tube are fixed by fixing bolts;

[0057] Adjust the thickness of the insulating pad to control the distance between the T-shaped Faraday disk and the end face of the insulating ring in front of the disk;

[0058] The signal received by the Faraday disk is transmitted to the signal processing device through the metal rod, the metal cylinder, the signal connector end, the signal connector and the signal line;

[0059] The metal disk of the T-type Faraday disk is hexagonal;

[0060] The diagonal dimension of the hexagonal metal disk of the T-type Faraday disk is 16 mm;

[0061] There are no through holes for fixing on the hexagonal metal disk on the T-type Faraday disk;

[0062] The metal rod and metal cylinder of the T-shaped Faraday disk are processed into an integral component;

[0063] The distance between the end face of the insulating tube and the end face of the through hole of the T-shaped metal fixing plate is 1.2mm;

[0064] The distance between the T-type Faraday disk and the end face of the insulating ring in front of the disk is 0.2 mm;

[0065] The Faraday disk and its fixing device for ion mobility spectrometry signal reception can realize the reliable assembly of the Faraday disk, the airtightness of the migration tube and the unobstructed drift gas channel, thereby ensuring stable signal reception and transmission.

[0066] The ion transfer tube equipped with the Faraday disk device has an airtightness and a pressure resistance greater than 0.18 MPa;

[0067] Example 3

[0068] A fixed Faraday disk device for ion mobility spectrometry signal reception comprises a front-disk insulating ring, a T-shaped Faraday disk, a T-shaped metal fixing disk, an insulating cylinder, a metal cylinder, an insulating pad, a Faraday disk shielding cylinder, and fixing bolts. The T-shaped Faraday disk comprises a metal disk and a metal rod. The T-shaped metal fixing disk has a hollow through-hole, a fixing through-hole, and a signal connector end. The Faraday disk shielding cylinder has a hollow through-hole, a threaded hole, and an air vent.

[0069] The metal rod of the T-shaped Faraday disk is inserted into the metal tube and welded to fix it. The metal tube is inserted into the insulating tube and tightly fits. The insulating tube is then embedded in the through hole of the T-shaped metal fixing disk to control the distance between the end face of the insulating tube and the end face of the through hole of the T-shaped metal fixing disk.

[0070] The signal connector end on the T-shaped metal fixing plate is connected to the matching signal connector and signal line;

[0071] The T-shaped metal fixing plate, the insulating pad and the Faraday plate shielding tube are fixed by fixing bolts;

[0072] Adjust the thickness of the insulating pad to control the distance between the T-shaped Faraday disk and the end face of the insulating ring in front of the disk;

[0073] The signal received by the Faraday disk is transmitted to the signal processing device through the metal rod, the metal cylinder, the signal connector end, the signal connector and the signal line;

[0074] The metal disk of the T-type Faraday disk is octagonal;

[0075] The diagonal size of the octagonal metal disk of the T-type Faraday disk is 16 mm.

[0076] There are four through holes on the octagonal metal plate of the T-type Faraday plate for fixing bolts to pass through.

[0077] The metal rod of the T-shaped Faraday disk is inserted into the metal cylinder and welded to fix it;

[0078] The distance between the end face of the insulating tube and the end face of the through hole of the T-shaped metal fixing plate is 0.2mm;

[0079] The distance between the T-shaped Faraday disk and the end face of the insulating ring in front of the disk is 2 mm;

[0080] The Faraday disk and its fixing device for ion mobility spectrometry signal reception can realize the reliable assembly of the Faraday disk, the airtightness of the migration tube and the unobstructed drift gas channel, thereby ensuring stable signal reception and transmission.

[0081] The ion transfer tube equipped with the Faraday disk device has an airtightness and a pressure resistance greater than 0.18 MPa;

[0082] Example 4

[0083] A fixed Faraday disk device for ion mobility spectrometry signal reception comprises a front-disk insulating ring, a T-shaped Faraday disk, a T-shaped metal fixing disk, an insulating cylinder, a metal cylinder, an insulating pad, a Faraday disk shielding cylinder, and fixing bolts. The T-shaped Faraday disk comprises a metal disk and a metal rod. The T-shaped metal fixing disk has a hollow through-hole, a fixing through-hole, and a signal connector end. The Faraday disk shielding cylinder has a hollow through-hole, a threaded hole, and an air vent.

[0084] The metal rod of the T-shaped Faraday disk is inserted into the metal tube and welded to fix it. The metal tube is inserted into the insulating tube and tightly fits. The insulating tube is then embedded in the through hole of the T-shaped metal fixing disk to control the distance between the end face of the insulating tube and the end face of the through hole of the T-shaped metal fixing disk.

[0085] The signal connector end on the T-shaped metal fixing plate is connected to the matching signal connector and signal line;

[0086] The T-shaped metal fixing plate, the insulating pad and the Faraday plate shielding tube are fixed by fixing bolts;

[0087] Adjust the thickness of the insulating pad to control the distance between the T-shaped Faraday disk and the end face of the insulating ring in front of the disk;

[0088] The signal received by the Faraday disk is transmitted to the signal processing device through the metal rod, the metal cylinder, the signal connector end, the signal connector and the signal line;

[0089] The metal disk of the T-type Faraday disk is a quadrilateral;

[0090] The diagonal size of the square metal disk of the T-type Faraday disk is 4 mm.

[0091] There are no through holes for fixing on the quadrangular metal disk of the T-type Faraday disk;

[0092] The metal rod and metal cylinder of the T-shaped Faraday disk are processed into an integral component;

[0093] The distance between the end face of the insulating tube and the end face of the through hole of the T-shaped metal fixing plate is 0.2mm;

[0094] The distance between the T-shaped Faraday disk and the end face of the insulating ring in front of the disk is 3 mm;

[0095] The Faraday disk and its fixing device for ion mobility spectrometry signal reception can realize the reliable assembly of the Faraday disk, the airtightness of the migration tube and the unobstructed drift gas channel, thereby ensuring stable signal reception and transmission.

[0096] The ion transfer tube equipped with the Faraday disk device has an airtightness and a pressure resistance greater than 0.18 MPa;

[0097] 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 disk device for receiving fixed ion mobility spectrometry signals, characterized in that: The utility model comprises an insulating ring in front of the disk, a Faraday disk, a metal fixed disk, an insulating tube, a metal tube, an insulating pad, a Faraday disk shielding tube and fixing bolts. The Faraday disk comprises a metal disk and a metal rod. The metal rod is inserted into the metal tube. The insulating tube is sleeved on the outside of the metal tube. A hole for the insulating tube to pass through is provided in the middle of the metal fixed disk, and a hole for the fixing bolt to pass through is also provided on it. A blind hole for installing the fixing bolt is provided on the inner wall of the Faraday disk shielding tube. The metal fixed disk and the Faraday disk shielding tube are installed by fixing bolts. An insulating pad is provided between the metal fixed disk and the Faraday disk shielding tube. The metal fixed disk is provided inside the Faraday disk shielding tube. The bottom end of the Faraday disk shielding tube is provided with a slot. The top surface of the insulating ring in front of the disk is provided with a protrusion that matches the slot. The end of the metal fixed disk away from the Faraday disk is provided with a signal connector end.

2. The Faraday disk device for receiving stationary ion mobility spectrometry signals 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.

3. The Faraday disk device for receiving stationary ion mobility spectrometry signals according to claim 1, characterized in that: The metal disk includes a hexagonal metal disk, an octagonal metal disk, a circular metal disk, and a quadrilateral metal disk.

4. The Faraday disk device for receiving stationary ion mobility spectrometry signals according to claim 1, characterized in that: The entire cross section of the Faraday disk is T-shaped, and the cross section of the metal fixed disk is T-shaped.

5. The Faraday disk device for receiving stationary ion mobility spectrometry signals according to claim 1, characterized in that: The diagonal dimension of the metal disk is between 4-16 mm or the diameter is between 4-16 mm.

6. The Faraday disk device for receiving stationary ion mobility spectrometry signals according to claim 1, characterized in that: The distance between the Faraday disk and the end face of the insulating ring in front of the disk is 0.2-5 mm.

7. The Faraday disk device for receiving stationary ion mobility spectrometry signals according to claim 1, characterized in that: The metal plate has no fixing through holes, or has 2-4 fixing through holes distributed thereon for the fixing bolts to pass through.

8. The Faraday disk device for receiving stationary ion mobility spectrometry signals according to claim 1, characterized in that: The metal rod is inserted into the metal cylinder and fixed by welding, or the metal rod and the metal cylinder are processed into an integrated component.

9. The Faraday disk device for receiving stationary ion mobility spectrometry signals according to claim 1, characterized in that: The distance between the end face of the insulating tube and the end face of the through hole of the T-shaped metal fixing plate is 0.2-1.2 mm.

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