A sniffer for mass spectrometer leak detector

Abstract

The present invention relates to the technical field of leak detection, and specifically to a sniffer for a mass spectrometer leak detector, comprising a base, an air pump is fixedly installed on the right side of the upper end of the base, a gas analyzer is connected to the left end of the air pump, and a connecting pipe is connected to the left end of the gas analyzer. In the present invention, the sniffer probe is placed on one side of a test object corresponding to the test object, the base is fixed, and an electric push rod is started to drive the sniffer probe to move toward the surface of the test object. The sniffer probe will also drive a barrier shell to move synchronously until the left end of the barrier shell abuts and fits on the surface of the test object, so that the sniffer probe cover is attached to the surface of the test object, which is beneficial to reducing the direct exposure of the sniffer probe to the vicinity of the surface of the test object and the inhalation of other surrounding gases and dust during operation, thereby ensuring the accuracy of the test.

Description

Technical Field

[0001] The present invention relates to the technical field of leak detection, and in particular to a sniffer for a mass spectrometer leak detector. Background Art

[0002] The gas detection system is generally divided into a control part, a sensor part, and a management platform part, which can realize functions such as remote unmanned operation, real-time data feedback, over-limit alarm, equipment linkage, and data analysis.

[0003] A search revealed patent publication number 201780052944.5, which discloses a "sniffer leak detector with distance-dependent carrier gas flow control." A sniffer probe passes along a test object. A controller is provided that is configured to detect the measured distance and, depending on the detected distance, vary the carrier gas flow along the airflow path from the sniffer tip to the vacuum pump.

[0004] However, when the above patent is in use, the sniffer probe is placed near the surface of the test object, which easily inhales other gases in the nearby air, resulting in inaccurate testing. Moreover, the sniffer probe is not blocked from the surrounding air and is also prone to inhaling dust and impurities in the surrounding air, which is also not conducive to the accuracy of the test. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem in the prior art that the sniffer probe is placed near the surface of the test object, which easily inhales other gases in the nearby air, resulting in inaccurate testing. In addition, the sniffer probe is not blocked from the surrounding air and is also prone to inhaling dust and impurities in the surrounding air, which is also not conducive to the accuracy of the test. A sniffer for a mass spectrometer leak detector is proposed to solve the problem in the prior art that the sniffer probe is placed near the surface of the test object, which easily inhales other gases in the nearby air, thereby causing inaccurate testing.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A sniffer for a mass spectrometer leak detector comprises a base, an air pump is fixedly mounted on the right side of the upper end of the base, a gas analyzer is connected to the left end of the air pump, a connecting pipe is connected to the left end of the gas analyzer, and a sniffer probe is connected to the left end of the connecting pipe;

[0008] A blocking mechanism for blocking the sniffing area of ​​the sniffer probe is also provided, and the blocking mechanism includes an electric push rod fixedly mounted on the lower side of the right end of the sniffer probe, the lower end of the electric push rod is fixedly connected to the base, and a blocking shell is slidably installed through the middle of the sniffer probe, a spring 1 is fixedly mounted on the right end of the blocking shell, and the right end of the spring 1 is fixedly connected to the sniffer probe, a scraper is provided on the left front side of the blocking shell, a telescopic rod is fixedly mounted on the middle of the right end of the scraper, a slider is fixedly mounted on the right end of the telescopic rod, and a spring 2 is sleeved on the outer side of the telescopic rod, and the left and right ends of the spring 2 are fixedly connected to the scraper and the slider respectively;

[0009] A cleaning mechanism is also provided for cleaning impurities inside the barrier shell, and the cleaning mechanism includes a sealing plate slidably mounted on the left side of the lower end of the barrier shell. The left side of the lower end of the barrier shell is open, and the sealing plate blocks the lower end of the opening, and the left end of the sealing plate is flush with the left end of the barrier shell. Limiting blocks are fixedly installed on both the front and rear sides of the upper end of the sealing plate, and a spring five is fixedly mounted on the right end of the sealing plate, and the right end of the spring five is fixedly connected to the lower end of the barrier shell.

[0010] Preferably, a magnetic plate 1 is slidably installed on the right end of the slider, and a slide plate is fixedly installed on the upper end of the blocking shell corresponding to the magnetic plate 1. The magnetic plate 1 is slidably connected to the slide plate. A spring 3 is fixedly installed on the lower end of the slider, and the lower end of the spring 3 is fixedly connected to the magnetic plate 1.

[0011] Preferably, a driving magnetic plate 1 is provided on the front right side of the magnetic plate 1, a driving magnetic plate 2 is fixedly mounted on a lower end of the driving magnetic plate, and a rear end of the driving magnetic plate 2 is fixedly connected to the sniffer probe.

[0012] Preferably, a passive plate is fixedly mounted on the upper end of the slider, a convex block is fixedly mounted on the right side of the upper end of the passive plate, a convex strip is provided on the upper side of the convex block, and the convex strip is fixedly connected to the upper end of the barrier shell.

[0013] Preferably, a baffle is slidably mounted on the front side of the left end of the sniffer probe, a connecting rod is slidably mounted on the front end of the baffle, and the connecting rod penetrates and is slidably mounted on the front end of the barrier shell.

[0014] Preferably, a magnetic plate 2 is fixedly mounted on the front end of the connecting rod, a spring 4 is sleeved on the outer side of the connecting rod, and the front and rear ends of the spring 4 are fixedly connected to the magnetic plate 2 and the blocking shell respectively.

[0015] Preferably, a steel wire rope is fixedly installed at the right end of the sealing plate, a pulley is provided at the lower end of the barrier shell corresponding to the steel wire rope, and a movable plate is fixedly installed at the other end of the steel wire rope.

[0016] Preferably, a flexible block is provided on the right side of the movable plate, and the front end of the flexible block is fixedly mounted on the second driving magnetic plate.

[0017] Preferably, a nozzle tube is provided inside the blocking shell at the lower side of the sniffer probe, an air bag is provided at the front end of the nozzle tube through a hose, and the front and rear ends of the air bag are fixedly connected to the magnetic plate 2 and the blocking shell respectively.

[0018] Preferably, a rotating shaft is fixedly installed at the rear end of the nozzle tube, the rotating shaft is rotatably installed on the blocking shell, a gear is fixedly installed on the middle part of the rotating shaft, a rack is provided on the upper right side of the gear, the rack is fixedly installed on the rear end of the sniffer probe, and a torsion spring is sleeved on the outer side of the rotating shaft.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In the present invention, the sniffer probe is placed on one side of the test object, the base is fixed, and the electric push rod is started to drive the sniffer probe to move toward the surface of the test object. The sniffer probe also drives the barrier shell to move synchronously until the left end of the barrier shell abuts and fits against the surface of the test object, making it easy to attach the sniffer probe cover to the surface of the test object, which is beneficial to reducing the direct exposure of the sniffer probe to the surface of the test object and the inhalation of other surrounding gases and dust during operation, thereby ensuring the accuracy of the test.

[0021] 2. In the present invention, when the blocking shell moves, it will also drive the slide plate, the magnetic plate 1, the slider, the telescopic rod and the scraper to move synchronously. The scraper will first block the shell from contacting and fitting on the surface of the test object. When the electric push rod continues to drive the sniffer probe to move, it will cooperate with the blocking shell to compress the spring 1. At the same time, the blocking shell and the scraper will stop moving, and the telescopic rod and the spring 2 between the scraper and the slider will adaptively shrink and be compressed. When the sniffer probe continues to move, it will also drive the driving magnetic plate 2 and the driving magnetic plate 1 to continue moving. When the driving magnetic plate 1 moves to the front side of the magnetic plate 1, it will generate a magnetic repulsive force on the magnetic plate 1, and then push the magnetic plate 1 to slide backward on the slide plate. The magnetic plate 1 will also drive the slider, the telescopic rod and the scraper to move backward synchronously. The scraper bar is convenient for scraping off impurities adhered to the surface of the test object, avoiding impurities causing unevenness on the surface of the test object, causing gaps when the blocking shell and the surface of the test object fit together, thereby ensuring the blocking quality of the blocking shell.

[0022] 3. In the present invention, when the slider follows the magnetic plate to move backward, it will also drive the passive plate to move backward synchronously, and the passive plate will drive the protrusion to move synchronously. The protrusion will be intermittently squeezed by the protrusion, and then the protrusion will drive the passive plate and the slider to slide downward on the magnetic plate as a whole, compressing the spring three, and the slider will also drive the telescopic rod and the scraper to move synchronously. The spring three plays a reset role. While the scraper moves backward, it will also make an up and down reciprocating motion, which is convenient for scraping off impurities that are difficult to scrape off and stuck on the surface of the test object, thereby ensuring the blocking quality of the blocking shell. The rear side of the slide plate is inclined, which is convenient for moving the magnetic plate one, the slider, the telescopic rod and the scraper to the rear side of the blocking shell, making it convenient for the left end of the blocking shell to fit with the surface of the test object.

[0023] 4. In the present invention, when the magnetic plate 2 is driven to move to the left, the flexible block will also be driven to move synchronously. The flexible block will push the movable plate to slide to the left on the blocking shell, and then pull the sealing plate to slide to the right at the bottom of the blocking shell through the wire rope, compressing the spring 5 to open the opening. At the same time, when the magnetic plate 2 is driven to move to the front side of the magnetic plate 2, a magnetic thrust will be generated on the magnetic plate 2, causing the magnetic plate 2 to drive the connecting rod to move backward on the front end of the blocking shell, compressing the spring 4 and the airbag, so that the gas in the airbag is ejected from the nozzle tube, making it convenient to automatically discharge the impurities scraped off the bottom of the blocking shell by the scraper to the outside from the opening, thereby avoiding the impurities in the blocking shell being inhaled by the sniffing probe during operation, thereby affecting the detection quality.

[0024] 5. In the present invention, when the connecting rod slides backward, it also drives the baffle to slide backward synchronously. The baffle is convenient for blocking the sniffer probe to prevent impurities sprayed from the nozzle tube from splashing into the sniffer probe, thereby ensuring the cleanliness of the sniffer probe.

[0025] 6. In the present invention, when the sniffer probe continues to move to the left, it will also drive the rack to move synchronously. The rack gradually engages with the gear, driving the gear, the rotating shaft and the nozzle tube to rotate, compressing the torsion spring, and expanding the cleaning range of the nozzle tube to the bottom of the barrier shell, ensuring that there are no dead angles in the cleaning, thereby ensuring that the sniffer probe will not be accidentally inhaled due to impurities remaining in the barrier shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the left three-dimensional structure of the present invention;

[0028] Figure 3 This is a bottom-up perspective structural diagram of the present invention;

[0029] Figure 4 For the present invention Figure 1 Schematic diagram of the structure of the connection between the middle barrier shell and the sniffer probe;

[0030] Figure 5 For the present invention Figure 2 Schematic diagram of the structure of the connection between the middle barrier shell and the sniffer probe;

[0031] Figure 6 For the present invention Figure 3 Schematic diagram of the structure of the connection between the middle barrier shell and the sniffer probe;

[0032] Figure 7 For the present invention Figure 4 Schematic diagram of the structure at A in the middle;

[0033] Figure 8 For the present invention Figure 4Schematic diagram of the structure at B in the middle;

[0034] Figure 9 For the present invention Figure 4 Schematic diagram of the structure at C in the middle;

[0035] Figure 10 For the present invention Figure 4 Schematic diagram of the structure at D in the middle;

[0036] Figure 11 For the present invention Figure 4 Schematic diagram of the structure at E in the middle;

[0037] Figure 12 For the present invention Figure 5 Schematic diagram of the structure at F in the middle;

[0038] In the figure: 1. Base; 2. Air pump; 3. Gas analyzer; 4. Connecting pipe; 5. Sniffer probe;

[0039] Blocking mechanism: 6, electric push rod; 7, blocking shell; 8, spring 1; 9, scraper; 10, telescopic rod; 11, slider; 12, spring 2; 13, magnetic plate 1; 1101, spring 3; 14, slide plate; 15, driving magnetic plate 1; 16, driving magnetic plate 2; 17, passive plate; 18, bump; 19, convex strip; 20, baffle; 21, connecting rod; 22, spring 4; 23, magnetic plate 2;

[0040] Cleaning mechanism: 24. Closing plate; 25. Limiting block; 26. Spring five; 27. Steel wire rope; 28. Pulley; 29. ​​Movable plate; 30. Flexible block; 31. Nozzle tube; 32. Airbag; 33. Rotating shaft; 34. Gear; 35. Rack; 36. Torsion spring. DETAILED DESCRIPTION

[0041] 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 described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0043] Reference Figures 1-12A sniffer for a mass spectrometer leak detector comprises a base 1, an air pump 2 is fixedly mounted on the right side of the upper end of the base 1, a gas analyzer 3 is connected to the left end of the air pump 2, a connecting pipe 4 is connected to the left end of the gas analyzer 3, and a sniffer probe 5 is connected to the left end of the connecting pipe 4; a blocking mechanism for blocking the sniffer area of ​​the sniffer probe 5 is also provided, the blocking mechanism comprises an electric push rod 6 fixedly mounted on the lower side of the right end of the sniffer probe 5, the lower end of the electric push rod 6 is fixedly connected to the base 1, and the middle of the sniffer probe 5 is penetrated by the electric push rod 6. A blocking shell 7 is installed through the sliding, and a spring 8 is fixedly installed on the right end of the blocking shell 7. The right end of the spring 8 is fixedly connected to the sniffer probe 5. A scraper 9 is provided on the left front side of the blocking shell 7. A telescopic rod 10 is fixedly installed in the middle of the right end of the scraper 9. A slider 11 is fixedly installed on the right end of the telescopic rod 10, and a spring 2 12 is provided on the outer side of the telescopic rod 10. The left and right ends of the spring 2 12 are fixedly connected to the scraper 9 and the slider 11 respectively. A magnetic plate 13 is slidably installed on the right end of the slider 11, and the upper end of the blocking shell 7 corresponds to The magnetic plate 13 is fixedly installed with a slide plate 14, and the magnetic plate 13 is slidably connected to the slide plate 14. The lower end of the slider 11 is fixedly installed with a spring 3 1101, and the lower end of the spring 3 1101 is fixedly connected to the magnetic plate 13. The front right side of the magnetic plate 13 is provided with a driving magnetic plate 15, and the lower end of the driving magnetic plate 15 is fixedly installed with a driving magnetic plate 2 16. The rear end of the driving magnetic plate 2 16 is fixedly connected to the sniffer probe 5. The upper end of the slider 11 is fixedly installed with a passive plate 17. The upper end of the passive plate 17 A protrusion 18 is fixedly installed on the right side of the end, and a protrusion 19 is provided on the upper side of the protrusion 18. The protrusion 19 is fixedly connected to the upper end of the blocking shell 7. A baffle 20 is slidably installed on the front side of the left end of the sniffer probe 5. A connecting rod 21 is slidably installed on the front end of the baffle 20. The connecting rod 21 is slidably installed on the front end of the blocking shell 7. A magnetic plate 23 is fixedly installed on the front end of the connecting rod 21. A spring 4 22 is sleeved on the outer side of the connecting rod 21. The front and rear ends of the spring 4 22 are respectively fixedly connected to the magnetic plate 23 and the blocking shell 7;

[0044] During operation, the sniffer probe 5 is placed on one side of the test object, the base 1 is fixed, and the electric push rod 6 is started to drive the sniffer probe 5 to move toward the surface of the test object. The sniffer probe 5 will also drive the blocking shell 7 to move synchronously until the left end of the blocking shell 7 abuts against the surface of the test object, making it easy to attach the sniffer probe 5 to the surface of the test object, which is beneficial to reduce the direct exposure of the sniffer probe 5 to the surface of the test object and the inhalation of other surrounding gases and dust during operation, thereby ensuring the accuracy of the test. When the blocking shell 7 moves, it will also drive the slide plate 14, the magnetic plate 13, the slider 11, and the telescopic The rod 10 and the scraper 9 move synchronously. The scraper 9 will first block the shell 7 and fit on the surface of the test object. When the electric push rod 6 continues to drive the sniffer probe 5 to move, it will cooperate with the blocking shell 7 to compress the spring 1 8. At the same time, the blocking shell 7 and the scraper 9 will stop moving. The telescopic rod 10 and the spring 2 12 between the scraper 9 and the slider 11 will adaptively shrink and be compressed. When the sniffer probe 5 continues to move, it will also drive the driving magnetic plate 2 16 and the driving magnetic plate 1 15 to continue moving. When the driving magnetic plate 15 moves to the front side of the magnetic plate 13, it will generate a magnetic repulsion on the magnetic plate 13, thereby pushing the magnetic plate 13 to move. The plate 13 slides backward on the slide plate 14, and the magnetic plate 13 also drives the slider 11, the telescopic rod 10 and the scraper 9 to move backward synchronously. The scraper 9 is convenient for scraping off impurities adhering to the surface of the test object, so as to avoid the impurities causing the surface of the test object to be uneven, resulting in a gap when the barrier shell 7 and the surface of the test object are fitted, thereby ensuring the barrier quality of the barrier shell 7. When the slider 11 moves backward following the magnetic plate 13, it will also drive the passive plate 17 to move backward synchronously, and the passive plate 17 will drive the protrusion 18 to move synchronously. The protrusion 18 will be intermittently squeezed by the protrusion 19, and then the protrusion 18 will The passive plate 17 and the slider 11 are driven to slide downward on the magnetic plate 13 as a whole, compressing the spring three 1101, and the slider 11 will also drive the telescopic rod 10 and the scraper 9 to move synchronously. The spring three 1101 plays a reset role. While the scraper 9 moves backward, it also makes an up and down reciprocating motion, which is convenient for scraping off impurities that are difficult to scrape off on the surface of the test object, thereby ensuring the blocking quality of the blocking shell 7. The rear side of the slide plate 14 is inclined, which facilitates the movement of the magnetic plate 13, the slider 11, the telescopic rod 10 and the scraper 9 to the rear side of the blocking shell 7, so that the left end of the blocking shell 7 can fit with the surface of the test object.

[0045] As an embodiment of the present invention, a cleaning mechanism for cleaning impurities inside the barrier shell 7 is further provided, and the cleaning mechanism includes a sealing plate 24 slidably mounted on the left side of the lower end of the barrier shell 7. The left side of the lower end of the barrier shell 7 is open, and the sealing plate 24 blocks the lower end of the opening, and the left end of the sealing plate 24 is flush with the left end of the barrier shell 7. A limit block 25 is fixedly installed on both the front and rear sides of the upper end of the sealing plate 24, and a spring five 26 is fixedly installed on the right end of the sealing plate 24. The right end of the spring five 26 is fixedly connected to the lower end of the barrier shell 7, and a steel wire rope 27 is fixedly mounted on the right end of the sealing plate 24. A pulley 28 is provided at the lower end of the barrier shell 7 corresponding to the steel wire rope 27, and the other end of the steel wire rope 27 is fixed. A movable plate 29 is installed, and a flexible block 30 is provided on the right side of the movable plate 29. The front end of the flexible block 30 is fixedly mounted on the driving magnetic plate 2 16. A nozzle tube 31 is provided inside the blocking shell 7 at the lower side of the sniffer probe 5. The front end of the nozzle tube 31 is connected to an air bag 32 through a hose. The front and rear ends of the air bag 32 are respectively fixedly connected to the magnetic plate 2 23 and the blocking shell 7. A rotating shaft 33 is fixedly mounted on the rear end of the nozzle tube 31. The rotating shaft 33 is rotatably mounted on the blocking shell 7. A gear 34 is fixedly mounted on the middle part of the rotating shaft 33. A rack 35 is provided on the upper right side of the gear 34. The rack 35 is fixedly mounted on the rear end of the sniffer probe 5, and a torsion spring 36 is sleeved on the outer side of the rotating shaft 33.

[0046] When working, when driving magnetic plate 21 to move to the left, it will also drive flexible block 30 to move synchronously. Flexible block 30 will push movable plate 29 to slide to the left on the blocking shell 7, and then pull the sealing plate 24 to slide to the right at the bottom of the blocking shell 7 through the wire rope 27, compressing spring five 26 to open the opening. At the same time, when driving magnetic plate 21 to move to the front side of magnetic plate 23, it will generate magnetic thrust on magnetic plate 23, so that magnetic plate 23 drives connecting rod 21 to move backward on the front end of blocking shell 7, compressing spring four 22 and airbag 32, so that the gas in airbag 32 is ejected from nozzle tube 31, so that impurities scraped by scraper 9 on the bottom of blocking shell 7 are automatically discharged to the outside from the opening, avoiding impurities in blocking shell 7 being sucked into the sniffer probe 5 during work, thereby affecting the detection quality. When connecting rod 21 slides backward, it will also drive baffle 20 to slide backward synchronously, and baffle 20 is convenient for blocking the sniffer probe 5, avoiding nozzle tube 3 When the sniffer probe 5 is working, the impurities sprayed by the sniffer probe 5 splash into the sniffer probe 5, thereby ensuring the cleanliness of the sniffer probe 5. The flexible block 30 will deform itself when squeezing and pushing the movable plate 29. When the movable plate 29 pulls the sealing plate 24 to fully open the opening, the movable plate 29 stops moving. The flexible block 30 will continue to deform until it passes over the movable plate 29. The spring 5 26 drives the sealing plate 24, the wire rope 27 and the movable plate 29 to return to their original position, and continues to seal the opening to prevent the opening from being open all the time. The sniffer probe 5 will still inhale external gas when working. When the sniffer probe 5 continues to move to the left, it will also drive the rack 35 to move synchronously. The rack 35 gradually meshes with the gear 34, driving the gear 34, the rotating shaft 33 and the nozzle tube 31 to rotate, compressing the torsion spring 36, and expanding the cleaning range of the nozzle tube 31 to the bottom of the barrier shell 7, ensuring that there is no dead angle for cleaning, thereby ensuring that the sniffer probe 5 will not be accidentally inhaled due to impurities remaining in the barrier shell 7 in the future.

[0047] Working principle:

[0048] When the present invention is used, the sniffer probe 5 is placed on one side of the test object, the base 1 is fixed, and the electric push rod 6 is started to drive the sniffer probe 5 to move toward the surface of the test object. The sniffer probe 5 will also drive the blocking shell 7 to move synchronously until the left end of the blocking shell 7 abuts and fits on the surface of the test object, which is convenient for attaching the sniffer probe 5 to the surface of the test object, which is beneficial to reducing the direct exposure of the sniffer probe 5 to the surface of the test object and the inhalation of other surrounding gases and dust during work, thereby ensuring the accuracy of the test. When the blocking shell 7 moves, it will also drive the slide plate 14, the magnetic plate 13, the slider 11, the telescopic rod 10 and the scraper 9 to move synchronously. The scraper 9 will first block the shell 7 from abutting and fitting on the surface of the test object. When the electric push rod 6 continues to drive the sniffer probe 5 When the sniffing probe 5 moves, it will cooperate with the blocking shell 7 to compress the spring 18. At the same time, the blocking shell 7 and the scraper 9 will stop moving. The telescopic rod 10 and the spring 2 12 between the scraper 9 and the slider 11 will adaptively shrink and be compressed. When the sniffer probe 5 continues to move, it will also drive the driving magnetic plate 2 16 and the driving magnetic plate 15 to continue moving. When the driving magnetic plate 15 moves to the front side of the magnetic plate 13, it will generate a magnetic repulsive force on the magnetic plate 13, and then push the magnetic plate 13 to slide backward on the slide plate 14. The magnetic plate 13 will also drive the slider 11, the telescopic rod 10 and the scraper 9 to move backward synchronously. The scraper 9 is convenient for scraping off impurities adhered to the surface of the test object to avoid impurities causing unevenness on the surface of the test object, causing the blocking shell 7 and the test object to be uneven. When the surface of the test object is fitted, a gap is generated, which ensures the blocking quality of the blocking shell 7. When the slider 11 moves backward following the magnetic plate 13, it will also drive the passive plate 17 to move backward synchronously. The passive plate 17 drives the protrusion 18 to move synchronously. The protrusion 18 will be intermittently squeezed by the protrusion 19, and then the protrusion 18 will drive the passive plate 17 and the slider 11 to slide downward on the magnetic plate 13 as a whole, compressing the spring three 1101, and the slider 11 will also drive the telescopic rod 10 and the scraper 9 to move synchronously. The spring three 1101 plays a reset role. While the scraper 9 moves backward, it will also make an up and down reciprocating motion, which is convenient for scraping off impurities that are difficult to scrape off and stick to the surface of the test object, thereby ensuring the blocking quality of the blocking shell 7. The rear side of the slide plate 14 is inclined, so In order to make the magnetic plate 13, the slider 11, the telescopic rod 10 and the scraper 9 move to the rear side of the blocking shell 7, it is convenient for the left end of the blocking shell 7 to fit with the surface of the test object. When the driving magnetic plate 2 16 moves to the left, it will also drive the flexible block 30 to move synchronously. The flexible block 30 will push the movable plate 29 to slide to the left on the blocking shell 7, and then pull the sealing plate 24 to slide to the right at the bottom of the blocking shell 7 through the wire rope 27, compressing the spring five 26 to open the opening. At the same time, when the driving magnetic plate 2 16 moves to the front side of the magnetic plate 2 23, a magnetic thrust will be generated on the magnetic plate 2 23, so that the magnetic plate 2 23 drives the connecting rod 21 to move backward on the front end of the blocking shell 7, compressing the spring four 22 and the airbag 32, so that the gas in the airbag 32 is ejected from the nozzle tube 31.It is convenient to automatically discharge the impurities scraped by the scraper 9 on the bottom of the barrier shell 7 from the opening to the outside, avoiding the impurities in the barrier shell 7 being sucked into the sniffer probe 5 during operation, thereby affecting the detection quality. When the connecting rod 21 slides backward, it will also drive the baffle 20 to slide backward synchronously. The baffle 20 is convenient to block the sniffer probe 5, avoiding the impurities sprayed by the nozzle tube 31 from splashing into the sniffer probe 5, thereby ensuring the cleanliness of the sniffer probe 5. The flexible block 30 will deform itself when squeezing and pushing the movable plate 29. When the movable plate 29 pulls the sealing plate 24 to fully open the opening, the movable plate 29 stops moving and the flexible block 30 will keep deforming. After it passes over the movable plate 29, the spring 5 26 drives the sealing plate 24, the wire rope 27 and the movable plate 29 to reset, and the opening is further sealed to prevent the opening from being left open and the sniffer probe 5 from still inhaling external air when working. When the sniffer probe 5 continues to move to the left, it also drives the rack 35 to move synchronously. The rack 35 gradually meshes with the gear 34, driving the gear 34, the rotating shaft 33 and the nozzle tube 31 to rotate, compressing the torsion spring 36, and expanding the cleaning range of the nozzle tube 31 to the bottom of the barrier shell 7, ensuring that there is no blind spot in the cleaning, thereby ensuring that the sniffer probe 5 will not be accidentally inhaled due to impurities remaining in the barrier shell 7.

[0049] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A sniffer for a mass spectrometer leak detector, comprising a base (1), characterized in that: An air pump (2) is fixedly mounted on the right side of the upper end of the base (1); a gas analyzer (3) is connected to the left end of the air pump (2); a connecting pipe (4) is connected to the left end of the gas analyzer (3); and a sniffer probe (5) is connected to the left end of the connecting pipe (4); A blocking mechanism for blocking the sniffing area of ​​the sniffer probe (5) is also provided, the blocking mechanism comprising an electric push rod (6) fixedly mounted on the lower right side of the sniffer probe (5), the lower end of the electric push rod (6) being fixedly connected to the base (1), a blocking shell (7) being slidably mounted through the middle of the sniffer probe (5), a spring 1 (8) being fixedly mounted on the right end of the blocking shell (7), the right end of the spring 1 (8) being fixedly connected to the sniffer probe (5), a scraper (9) being provided on the left front side of the blocking shell (7), a telescopic rod (10) being fixedly mounted on the middle of the right end of the scraper (9), a slider (11) being fixedly mounted on the right end of the telescopic rod (10), and a spring 2 (12) being sleeved on the outer side of the telescopic rod (10), the left and right ends of the spring 2 (12) being fixedly connected to the scraper (9) and the slider (11), respectively, the right end of the slider (11) being slidably mounted with a spring 1 (12). A magnetic plate (13) is fixedly mounted on the upper end of the blocking shell (7) corresponding to the magnetic plate (13), and a slide plate (14) is fixedly mounted on the upper end of the blocking shell (7), and the magnetic plate (13) is slidably connected to the slide plate (14). A spring (1101) is fixedly mounted on the lower end of the slider (11), and the lower end of the spring (1101) is fixedly connected to the magnetic plate (13). A driving magnetic plate (15) is provided on the front right side of the magnetic plate (13), and a driving magnetic plate (16) is fixedly mounted on the lower end of the driving magnetic plate (15). The rear end of the driving magnetic plate (16) is fixedly connected to the sniffer probe (5). A passive plate (17) is fixedly mounted on the upper end of the passive plate (17), and a convex block (18) is fixedly mounted on the right side of the upper end of the passive plate (17). A convex strip (19) is provided on the upper side of the convex strip (19), and the convex strip (19) is fixedly connected to the upper end of the blocking shell (7). A cleaning mechanism for cleaning impurities inside the barrier shell (7) is also provided, the cleaning mechanism comprising a sealing plate (24) slidably mounted on the left side of the lower end of the barrier shell (7), the left side of the lower end of the barrier shell (7) being open, the sealing plate (24) blocking the lower end of the opening, and the left end of the sealing plate (24) being flush with the left end of the barrier shell (7), a limit block (25) being fixedly mounted on both the front and rear sides of the upper end of the sealing plate (24), a spring five (26) being fixedly mounted on the right end of the sealing plate (24), and the right end of the spring five (26) being fixedly connected to the lower end of the barrier shell (7).

2. The sniffer for a mass spectrometer leak detector according to claim 1, characterized in that: A baffle (20) is slidably mounted on the front left end of the sniffer probe (5), a connecting rod (21) is slidably mounted on the front end of the baffle (20), and the connecting rod (21) penetrates and is slidably mounted on the front end of the barrier shell (7).

3. The sniffer for a mass spectrometer leak detector according to claim 2, characterized in that: A second magnetic plate (23) is fixedly mounted on the front end of the connecting rod (21), and a fourth spring (22) is sleeved on the outer side of the connecting rod (21). The front and rear ends of the fourth spring (22) are fixedly connected to the second magnetic plate (23) and the blocking shell (7) respectively.

4. The sniffer for a mass spectrometer leak detector according to claim 1, characterized in that: A steel wire rope (27) is fixedly mounted on the right end of the sealing plate (24), a pulley (28) is provided at the lower end of the barrier shell (7) corresponding to the steel wire rope (27), and a movable plate (29) is fixedly mounted on the other end of the steel wire rope (27).

5. The sniffer for a mass spectrometer leak detector according to claim 4, characterized in that: A flexible block (30) is provided on the right side of the movable plate (29), and the front end of the flexible block (30) is fixedly mounted on the second driving magnetic plate (16).

6. The sniffer for a mass spectrometer leak detector according to claim 1, characterized in that: A nozzle tube (31) is provided inside the blocking shell (7) at the lower side of the sniffer probe (5), and an air bag (32) is provided at the front end of the nozzle tube (31) through a hose. The front and rear ends of the air bag (32) are fixedly connected to the second magnetic plate (23) and the blocking shell (7), respectively.

7. The sniffer for a mass spectrometer leak detector according to claim 6, characterized in that: A rotating shaft (33) is fixedly mounted on the rear end of the nozzle tube (31), and the rotating shaft (33) is rotatably mounted on the blocking shell (7). A gear (34) is fixedly mounted on the middle of the rotating shaft (33), and a rack (35) is provided on the upper right side of the gear (34). The rack (35) is fixedly mounted on the rear end of the sniffer probe (5), and a torsion spring (36) is sleeved on the outer side of the rotating shaft (33).

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