Sampling device of time-of-flight mass spectrometer and time-of-flight mass spectrometer

Abstract

The utility model relates to the technical field of mass spectrometer equipment, particularly provides a time-of-flight mass spectrometer and a sampling device thereof, and aims to solve the problems that a door body and a shell of the sampling device of the conventional time-of-flight mass spectrometer are not tightly sealed and the structure is complicated. In order to achieve the purpose, the sample introduction device comprises a shell, two ends of the shell are respectively communicated with an external space and a vacuum cavity through a first sample introduction port and a second sample introduction port, and a sample introduction channel communicated with the first sample introduction port and the second sample introduction port is formed in the shell; the door body is arranged at the first sample inlet and comprises a door plate and a sealing block, the door plate is pivotally connected with the shell to drive the sealing plate to open and close the first sample inlet, and the sealing block is movably connected to the inner side of the door plate and can block the first sample inlet; the door stopper assembly can tightly suck the door body on the shell; and the elastic assembly is arranged between the door plate and the sealing block so as to press the sealing block on the surface of the shell after the door body is closed, and the fitting degree of the sealing block and the surface of the shell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mass spectrometer equipment, and specifically provides a sample injection device of a time-of-flight mass spectrometer and a time-of-flight mass spectrometer. Background Art

[0002] The detection process of the time-of-flight mass spectrometer needs to be carried out in a vacuum environment to ensure that the ionized ions will not be affected by air molecules during flight. In order to maintain the vacuum degree in the vacuum chamber of the mass spectrometer, an independent sampling device needs to be set up to connect the sampling device with the vacuum chamber, so that during the sampling process, the target plate can be first introduced into the sampling device from the sampling port, and then the sealing door is closed to form an independent sealed chamber in the sampling device, and then the sampling device is evacuated. The target plate can be introduced into the vacuum chamber only when the vacuum degree in the sampling device is close to the vacuum degree in the vacuum chamber, which reduces the pressure difference between the sampling device and the vacuum chamber, prevents the air pressure in the vacuum chamber from increasing significantly, and maintains the vacuum degree in the vacuum chamber to the maximum extent.

[0003] However, there are problems of poor sealing and complex structure between the sealing door and the shell of the existing sample injection device.

[0004] Therefore, this field needs a new technical solution to solve the above problems. Utility Model Content

[0005] The utility model aims to solve the above technical problem, that is, to solve the problem of poor sealing and complex structure between the sealing door body and the shell of the existing sample injection device.

[0006] In a first aspect, the utility model provides an injection device for a time-of-flight mass spectrometer, the injection device comprising: a shell, a first injection port and a second injection port are respectively provided at two ends of the shell, an injection channel connecting the first injection port and the second injection port is formed inside the shell, the first injection port is connected to an external space, and the second injection port is connected to a vacuum chamber of the time-of-flight mass spectrometer; a door body, the door body is arranged at the first injection port, and comprises a door plate and a sealing block, the sealing block is located on the inner side of the door plate and is movably connected to the door plate, and the door plate is connected to the The shell is pivotally connected to drive the sealing block to open and close the first injection port, and the sealing block can seal the first injection port after closing; a door suction assembly, the door suction assembly includes a first magnetic suction component arranged on the door panel and a second magnetic suction component arranged on the shell, and the suction force generated between the first magnetic suction component and the second magnetic suction component can suck the door body onto the first injection port; an elastic component, the elastic component is arranged between the door panel and the sealing block to press the sealing block against the shell at the edge of the first injection port after the door body is closed.

[0007] In a preferred technical solution of the above-mentioned sample injection device, a guide groove is provided on the inner side of the door plate, and the sealing block is slidably installed in the guide groove and can slide in a direction perpendicular to the door plate.

[0008] In the preferred technical solution of the above-mentioned sampling device, the elastic component includes a limiting bolt and a coil spring, one end of the limiting bolt is threadedly engaged with the sealing block, the other end of the limiting bolt is clamped with the door panel, and the coil spring is sleeved on the limiting bolt.

[0009] In the preferred technical solution of the above-mentioned sample injection device, the number of the elastic components is set to be multiple, and the multiple elastic components are distributed at intervals along the edge of the sealing block.

[0010] In a preferred technical solution of the above-mentioned sample injection device, an extension groove is provided on the inner side of the sealing block, and the extension groove is communicated with the first sample injection port after the door body is closed.

[0011] In a preferred technical solution of the above-mentioned sample injection device, the sample injection device further comprises an observation window arranged on the top of the shell, and glass is installed on the observation window.

[0012] In a preferred technical solution of the above-mentioned sample injection device, the sample injection device comprises a first spring plunger and a second spring plunger respectively arranged on both sides of the door panel, and the door panel is pivotally connected to the housing via the first spring plunger and the second spring plunger.

[0013] In the preferred technical solution of the above-mentioned sampling device, the sampling device further comprises a vacuum pipeline and a solenoid valve, the vacuum pipeline can connect the sampling channel with the vacuum equipment, and the solenoid valve can control the on-off of the vacuum pipeline.

[0014] In a preferred technical solution of the above-mentioned injection device, the injection device also includes a first sealing ring, which is arranged at the edge of the first injection port, and / or the injection device also includes a second sealing ring, which is arranged at the edge of the second injection port.

[0015] In a second aspect, the time-of-flight mass spectrometer comprises the above-mentioned sample injection device.

[0016] When the above technical scheme is adopted, the injection device of the utility model includes: a shell, a first injection port and a second injection port are respectively provided at two ends of the shell, an injection channel connecting the first injection port and the second injection port is formed inside the shell, the first injection port is connected to the external space, and the second injection port is connected to the vacuum chamber of the time-of-flight mass spectrometer; a door body, the door body is arranged at the first injection port, and includes a door plate and a sealing block, the sealing block is located on the inner side of the door plate and is movably connected to the door plate, the door plate is pivotally connected to the shell to drive the sealing block to open and close the first injection port, and the sealing block can block the first injection port after closing; a door suction assembly, the door suction assembly includes a first magnetic suction component arranged on the door plate and a second magnetic suction component arranged on the shell, the suction force generated between the first magnetic suction component and the second magnetic suction component can suck the door body onto the first injection port; an elastic component, the elastic component is arranged between the door plate and the sealing block to press the sealing block onto the shell at the edge of the first injection port after the door body is closed, thereby improving the fit between the sealing block and the shell. Through such an arrangement, on the one hand, after the door body is sucked tight, the inner surface of the sealing block can continuously adapt to the ups and downs or grooves of the shell surface through the telescopic adjustment and buffering effect of the elastic component, ensuring that the sealing block and the shell surface can always maintain a good fit, reducing the influence of tolerance and deformation on the sealing, improving the sealing of the first injection port, and helping to maintain the vacuum degree in the injection device; on the other hand, through the sealing fit of the door panel and the sealing block to the shell surface respectively, the double sealing of the door body to the first injection port is achieved, and the sealing is further improved; on the other hand, the sealing structure of the injection device is simplified, the use of the adjusting component is eliminated, and the adaptive adjustment between the door body and the shell is achieved, which helps to reduce assembly errors and improve the mechanical stability of the sealing structure.

[0017] Furthermore, the inner side of the door panel of the utility model is provided with a guide groove, and the sealing block is slidably installed in the guide groove and can slide in a direction perpendicular to the door panel. Through such a setting, on the one hand, while ensuring that the sealing block has sufficient activity margin, the sealing between the sealing block and the door panel is also ensured; on the other hand, the connection form between the sealing block and the door panel is simplified, making the overall structure of the door body more compact and tight, saving space, and improving the sealing performance.

[0018] Furthermore, the elastic component of the utility model includes a limit bolt and a coil spring, one end of the limit bolt is threadedly engaged with the sealing block, the other end of the limit bolt is clamped with the door panel, and the coil spring is sleeved on the limit bolt. Through such an arrangement, the connection between the door panel and the sealing block is ensured to be stable, the limit bolt can position and guide the coil spring, and the feedback of the sealing block is made more sensitive and accurate, so as to better cope with the deformation or fluctuation of the shell surface, and improve the fit and sealing of the sealing block and the shell surface.

[0019] Furthermore, the number of elastic components of the utility model is set to be multiple, and the multiple elastic components are spaced and distributed along the edge of the sealing block. Through such a setting, the pressing force from the door panel direction on the sealing block is more balanced, further improving the feedback speed and accuracy of the sealing block, and improving the fit and sealing performance between the sealing block and the shell surface.

[0020] Furthermore, the inner side of the sealing block of the utility model is provided with an extension groove, which is connected to the first injection port after the door body is closed. With such a configuration, during the sampling process, the extension groove can extend the length of the injection channel, so as to accommodate the end of the target plate when the door body is closed, so that the end of the target plate can be exposed outside the first injection port after the door body is opened, and the sampling can be completed without reaching into the injection device.

[0021] Furthermore, the sample injection device of the utility model also includes an observation window arranged on the top of the housing, and glass is installed on the observation window. Through such an arrangement, it is convenient to observe the transfer process of the target sample in the sample injection device from above, improve the control accuracy, and ensure the airtightness of the sample injection channel.

[0022] Furthermore, the sample injection device of the utility model comprises a first spring plunger and a second spring plunger respectively arranged on both sides of the door plate, and the door plate is pivotally connected to the housing through the first spring plunger and the second spring plunger. Through such an arrangement, the stability of the door body rotating opening and closing is improved.

[0023] Furthermore, the sample injection device of the utility model also includes a vacuum pipeline and a solenoid valve. The vacuum pipeline can connect the sample injection channel with the vacuum device, and the solenoid valve can control the on and off of the vacuum pipeline. Through such a setting, the sample injection channel can be vacuumed after the door is closed to adjust the vacuum degree in the sample injection channel to be close to or equal to the vacuum degree in the vacuum chamber, reduce the pressure difference between the two chambers, and avoid affecting the vacuum degree in the vacuum chamber when the target sample is transported between the two chambers.

[0024] Furthermore, the sample injection device of the utility model further comprises a first sealing ring, which is arranged at the edge of the first sample injection port, and / or the sample injection device further comprises a second sealing ring, which is arranged at the edge of the second sample injection port. Through such an arrangement, the first sealing ring can be used to improve the sealing performance between the door body and the first sample injection port, thereby preventing air leakage from affecting the vacuum degree of the sample injection device, and the second sealing ring can be used to improve the sealing performance at the connection between the second sample injection port and the vacuum chamber, thereby preventing air leakage from affecting the vacuum degree of the vacuum chamber.

[0025] In addition, the time-of-flight mass spectrometer further provided by the utility model on the basis of the above-mentioned sampling device includes the above-mentioned sampling device. Due to the adoption of the above-mentioned sampling device, the utility model has the technical effects possessed by the above-mentioned sampling device. Compared with the time-of-flight mass spectrometer before the improvement, the sealing and vacuum degree inside the time-of-flight mass spectrometer of the utility model are greatly improved, so that the equipment can quickly reach the vacuum degree required for the test, thereby improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0027] Figure 1 It is a structural schematic diagram of the sample injection device of the utility model;

[0028] Figure 2 It is a structural explosion diagram of the sample injection device of the utility model;

[0029] Figure 3 It is a cross-sectional view of the sample injection device of the utility model;

[0030] Figure 4 It is a structural schematic diagram of the shell of the utility model.

[0031] List of reference numerals:

[0032] 1. Shell; 11. First injection port; 12. Second injection port; 13. Injection channel; 14. Observation window; 21. Door panel; 211. Guide groove; 22. Sealing block; 221. Extension groove; 3. Door stopper assembly; 41. Limit bolt; 42. Coil spring; 51. First spring plunger; 52. Second spring plunger; 61. Vacuum extraction line; 62. Solenoid valve; 71. First sealing ring; 72. Second sealing ring. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0034] It should be noted that in the description of the present invention, the terms "inside", "outside", "upper", "lower", "top", "bottom" and other terms indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "connect", and "install" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Based on the problem pointed out in the background technology that the door body and the shell of the existing time-of-flight mass spectrometer sampling device are not tightly sealed and have a complex structure. The utility model provides a sampling device of a time-of-flight mass spectrometer and a time-of-flight mass spectrometer, by optimizing the door body structure at the first sampling port of the sampling device, the door body includes a door plate and a sealing block, the door plate is pivotally connected with the shell to drive the sealing plate to open and close the first sampling port, and the sealing block is movably connected to the inner side of the door plate to seal the first sampling port; the door body is sucked tightly onto the shell by a door suction assembly; and an elastic assembly is arranged between the door plate and the sealing block to press the sealing block onto the shell surface after the door body is closed, thereby improving the fit between the sealing block and the shell surface.

[0037] A time-of-flight mass spectrometer is an instrument that uses electronic measurement technology to measure the mass-to-charge ratio (m / z) of ions and their intensity. It uses an injection system to introduce the sample to be tested into the mass spectrometer, uses an ion source to ionize it, and uses an electric field to separate the ions according to their mass-to-charge ratio. The detector records the separated ion signals according to their mass-to-charge ratio and intensity. The detection process of the time-of-flight mass spectrometer needs to be carried out in a vacuum environment to ensure that the ionized ions will not be affected by air molecules during flight.

[0038] Matrix-assisted laser desorption (MALD I) is also one of the soft ionization techniques for mass spectrometry to ionize samples. Matrix-assisted laser desorption is to mix the analyte and the matrix in a certain proportion and then irradiate with laser. After absorbing the laser energy, the matrix transfers the laser energy to the analyte molecules, causing them to vaporize and ionize to form ions, including analyte ions and matrix ions. The mass spectrometer using matrix-assisted laser desorption technology is usually a matrix-assisted laser desorption ionization time-of-flight (MALD I-TOF) mass spectrometer.

[0039] Specifically, Figures 1 to 4As shown, the sample injection device of the utility model comprises: a shell 1, a first sample injection port 11 and a second sample injection port 12 are respectively provided at both ends of the shell 1, a sample injection channel 13 connecting the first sample injection port 11 and the second sample injection port 12 is formed inside the shell 1, the first sample injection port 11 is connected to the external space, and the second sample injection port 12 is connected to the vacuum chamber of the time-of-flight mass spectrometer; a door body, the door body is arranged at the first sample injection port 11, and comprises a door plate 21 and a sealing block 22, the sealing block 22 is located on the inner side of the door plate 21 and is movably connected to the door plate 21, and the door plate 21 is pivotally connected to the shell 1 to drive the sealing block 22 is used to open and close the first injection port 11, and the sealing block 22 can block the first injection port 11 after closing; the door suction assembly 3, the door suction assembly 3 includes a first magnetic attraction component arranged on the door plate 21 and a second magnetic attraction component arranged on the shell 1, and the suction force generated between the first magnetic attraction component and the second magnetic attraction component can attract the door body to the first injection port 11; the elastic component, the elastic component is arranged between the door plate 21 and the sealing block 22 to press the sealing block 22 to the shell 1 at the edge of the first injection port 11 after the door body is closed, so as to improve the fit between the sealing block 22 and the shell 1.

[0040] Exemplarily, the vacuum chamber of the time-of-flight mass spectrometer of the utility model has a third injection port, and the injection device is fixed on the outer wall of the vacuum chamber, so that the second injection port 12 is sealed and docked with the third injection port. A movable target stage device is also provided in the vacuum chamber, which can carry the target plate to move between the sealed chamber and the injection channel 13, so as to realize the transportation and placement of the target plate. A sealing door is also provided on the third injection port, which can seal and isolate the vacuum chamber from the injection channel 13. During the injection process, the target stage device moves into the injection channel 13, closes the sealing door, and forms an independent sealed channel for the injection channel 13, and then Open the door body, introduce the target plate from the first sample inlet 11 and fix it on the target stage, and close the door body. At this time, the opening and closing of the door body will cause external air to enter the sample inlet channel 13, causing the vacuum degree of the sample inlet channel 13 to change. Therefore, the sample inlet channel 13 needs to be evacuated until the vacuum degree in the sample inlet channel 13 is close to or equal to the vacuum degree in the vacuum chamber. Then the sealing door can be opened, and finally the target plate is brought into the vacuum chamber from the third sample inlet through the target stage device to complete the injection process. This arrangement can prevent the vacuum degree in the vacuum chamber from being affected by the entry of external air after the door body is opened and closed.

[0041] In order to ensure the vacuum degree in the injection channel 13 after the door body is closed, the inner surface of the door body and the surface of the shell 1 around the first injection port 11 are both arranged to be planes, so that the two can fit tightly after the door body is closed to improve the sealing performance. Magnets are installed on the inner side of the door panel 21 and at the position corresponding to the edge of the first injection port 11 and the door panel 21. Through the mutual attraction of the magnets on both sides, the door panel 21 can be firmly adsorbed on the first injection port 11, so that the inner side of the door panel 21 and the shell 1 fit more closely. In addition, a guide groove 211 is also provided on the inner side of the door panel 21. The shape and size of the guide groove 211 are adapted to the sealing block 22, so that the sealing block 22 can slide in the guide groove 211 in a direction perpendicular to the door panel 21. The elastic component is installed between the door panel 21 and the bottom of the guide groove 211, so that the sealing block 22 can move elastically relative to the guide groove 211. When the door body is opened, the elastic component The parts are in a naturally extended state, and the contact surface between the sealing block 22 and the first injection port 11 slightly protrudes from the inner surface of the door panel 21. When the door panel 21 is closed and sucked by the door suction assembly 3, the edge of the sealing block 22 is against the surface of the shell 1 at the edge of the first injection port 11, and the first injection port 11 is completely blocked. At this time, the sealing block 22 is flush with the door panel 21, and the elastic component is in a compressed state and accumulates elastic potential energy, thereby applying a clamping force toward the first injection port 11 to the sealing block 22, and pressing the sealing block 22 tightly against the surface of the shell 1. It should be noted that with the long-term use of the equipment, the surface of the shell 1 may undergo certain deformation or wear, or certain tolerances may be generated during the assembly process. In such cases, the elastic component can be adjusted to ensure that the sealing block 22 fits tightly with the surface of the shell 1, thereby ensuring the airtightness and vacuum degree of the injection channel 13.

[0042] To sum up, through such a setting, on the one hand, after the door body is sucked tight, the inner surface of the sealing block 22 can continuously adapt to the ups and downs or unevenness of the surface of the shell 1 through the telescopic adjustment effect of the elastic component, ensuring that the sealing block 22 and the surface of the shell 1 can always maintain a good fit, reducing the influence of tolerance and deformation on the sealing, improving the sealing of the first injection port 11, and helping to maintain the vacuum degree in the injection device; on the other hand, through the sealing fit of the door panel 21 and the sealing block 22 to the surface of the shell 1 respectively, the double sealing of the door body to the first injection port 11 is achieved, and the sealing is further improved; on the other hand, the sealing structure of the injection device is simplified, the use of the adjusting component is eliminated, and the adaptive adjustment between the door body and the shell 1 is achieved, which helps to reduce assembly errors and improve the mechanical stability of the sealing structure.

[0043] Preferably, if Figures 1 to 3 As shown, a guide groove 211 is provided on the inner side of the door panel 21 of the present invention, and the sealing block 22 is slidably installed in the guide groove 211 and can slide along a direction perpendicular to the door panel 21 .

[0044] Exemplarily, the shape and size of the guide groove 211 are adapted to the sealing block 22, and the contact surfaces between the guide groove 211 and the sealing block 22 are both configured as smooth planar structures, which helps to improve the relative sliding flexibility between the sealing block 22 and the guide groove 211. The sealing blocks 22 in this embodiment are configured as rectangular structures, and correspondingly, the guide groove 211 is configured as a rectangular groove structure.

[0045] The close fit between the guide groove 211 and the sealing block 22 ensures that the sealing block 22 has sufficient room for movement while also ensuring good sealing between the sealing block 22 and the door panel 21; in addition, it simplifies the connection between the sealing block 22 and the door panel 21, making the overall structure of the door body more compact and sturdy, saving space and improving the sealing performance.

[0046] Preferably, if Figure 2 and Figure 3 As shown, the elastic component of the utility model includes a limiting bolt 41 and a coil spring 42 . One end of the limiting bolt 41 is threadedly engaged with the sealing block 22 , and the other end of the limiting bolt 41 is snap-engaged with the door panel 21 . The coil spring 42 is sleeved on the limiting bolt 41 .

[0047] Exemplarily, a limiting through hole is provided on the door body, and a threaded hole is provided at a position corresponding to the limiting through hole on the sealing block 22. During assembly, the limiting bolt 41 is passed through the limiting through hole from the outside to the inside, so that the external thread at the end of the limiting bolt 41 is tightly connected with the threaded hole, so that the other end of the limiting bolt 41 can move axially in the limiting through hole, and the limiting cap at the other end can be stuck on the limiting structure in the limiting through hole to prevent the limiting bolt 41 from passing through the limiting through hole completely, so that the sealing block 22 and the door panel 21 remain connected, and the coil spring 42 is sleeved on the middle part of the limiting bolt 41. After assembly, the coil spring 42 is located between the sealing block 22 and the door panel 21, and its two ends are respectively abutted against the sealing block 22 and the door panel 21, so that a certain compression margin is maintained between the sealing block 22 and the door panel 21.

[0048] The combination of the coil spring 42 and the limiting bolt 41 ensures a firm connection between the door panel 21 and the sealing block 22, and the limiting bolt 41 can be used to position and guide the coil spring 42, making the feedback of the sealing block 22 more sensitive and accurate, so as to better cope with the height or undulations of the surface of the shell 1, and improve the fit and sealing between the sealing block 22 and the surface of the shell 1.

[0049] Preferably, if Figure 2 and Figure 3 As shown, the number of the elastic components of the present invention is set to be multiple, and the multiple elastic components are distributed along the edge of the sealing block 22 at intervals.

[0050] This arrangement makes the pressing force from the door panel 21 on the sealing block 22 more balanced, further improves the feedback speed and accuracy of the sealing block 22, and improves the fit and sealing between the sealing block 22 and the surface of the housing 1.

[0051] It should be noted that, in actual applications, those skilled in the art can flexibly set the position and number of elastic components, as long as the balanced force on the sealing block 22 can be achieved. Such flexible adjustment and change does not deviate from the principle and scope of the present invention, and should be limited to the protection scope of the present invention. The present solution preferably sets an elastic component at each of the four corners of the sealing block 22.

[0052] Preferably, if Figure 1 and Figure 2 As shown, an extension groove 221 is provided on the inner side of the sealing block 22 of the utility model, and the extension groove 221 is communicated with the first injection port 11 after the door body is closed.

[0053] Specifically, the slot of the extension slot 221 is located on a side of the sealing block 22 close to the first injection port 11, and can be connected to the first injection port 11 after the door body is closed, thereby extending the length of the injection channel 13, so that during the sampling process, the mobile target stage can extend the end of the target plate into the extension slot 221, so that the end of the target plate is exposed to the outside of the first injection port 11 after the door body is opened, thereby completing the removal and placement of the target plate without having to extend it into the injection device, thereby improving the convenience of removal and placement.

[0054] Preferably, if Figures 1 to 4 As shown, the sample injection device of the present invention further comprises an observation window 14 arranged on the top of the housing 1 , and glass is installed on the observation window 14 .

[0055] Exemplarily, the observation window 14 is set to be square and sealed with glass, so that the operator can observe the transportation of the target sample in the injection device from above, thereby improving the control accuracy and ensuring the sealing of the injection channel 13.

[0056] Preferably, if Figure 1 and Figure 2 As shown, the sample injection device of the present invention comprises a first spring plunger 51 and a second spring plunger 52 respectively arranged on both sides of the door plate 21 , and the door plate 21 is pivotally connected to the housing 1 via the first spring plunger 51 and the second spring plunger 52 .

[0057] Exemplarily, a first mounting hole is provided on both sides of the door panel 21, and a second mounting hole is provided on both sides of the shell 1 at positions corresponding to the first mounting hole. Both ends of the spring plunger are respectively installed between the first mounting hole and the second mounting hole, so that the top pin of the spring plunger rests on the bottom of the second mounting hole, thereby enabling the spring plunger to be subjected to axial preload, thereby improving the stability of the door body's rotation opening and closing.

[0058] Preferably, if Figure 1 and Figure 2 As shown, the sample injection device of the present invention further includes a vacuum pipeline 61 and a solenoid valve 62 . The vacuum pipeline 61 can connect the sample injection channel 13 with the vacuum device, and the solenoid valve 62 can control the on and off of the vacuum pipeline 61 .

[0059] Exemplarily, when the injection channel 13 needs to be evacuated, that is, when the target plate enters the injection channel 13, the door body is first closed, and the vacuum line 61 is sealed and connected to the external vacuum equipment (such as a vacuum pump, etc.), and then the solenoid valve 62 is opened to start vacuuming until the vacuum degree in the injection channel 13 is close to or equal to the vacuum degree in the vacuum chamber, and then the solenoid valve 62 is closed, and the connection between the vacuum line 61 and the vacuum equipment is disconnected, thereby completing the adjustment of the vacuum degree in the injection channel 13. At this time, the target plate can be introduced into the vacuum chamber from the third injection port. This setting can reduce the pressure difference between the two chambers and avoid affecting the vacuum degree in the vacuum chamber when the target plate is transferred between the two chambers.

[0060] Preferably, if Figures 1 to 4 As shown, the injection device of the present invention further includes a first sealing ring 71 , which is arranged at the edge of the first injection port 11 , and / or the injection device further includes a second sealing ring 72 , which is arranged at the edge of the second injection port 12 .

[0061] Exemplarily, the first sealing ring 71 and the second sealing ring 72 can both be set as rubber rings. The first sealing ring 71 can improve the sealing between the door body and the first injection port 11 to prevent air leakage from affecting the vacuum degree of the injection device. The second sealing ring 72 can improve the sealing at the connection between the second injection port 12 and the vacuum chamber to prevent air leakage from affecting the vacuum degree of the vacuum chamber.

[0062] It should be noted that the first sealing ring 71 has a strong deformation characteristic, which helps it to fit closely with the sealing plate and improve the sealing performance. However, the rubber material is also easily deformed by environmental factors such as temperature, air pressure or external force, causing the flatness of the sealing surface to deteriorate. The combination of the elastic component and the sealing block 22 in the utility model can solve this problem well and ensure that the two always maintain a good fit.

[0063] In addition, the time-of-flight mass spectrometer further provided by the utility model on the basis of the above-mentioned sampling device includes the above-mentioned sampling device. Due to the adoption of the above-mentioned sampling device, the utility model has the technical effects possessed by the above-mentioned sampling device. Compared with the time-of-flight mass spectrometer before the improvement, the sealing and vacuum degree inside the time-of-flight mass spectrometer of the utility model are greatly improved, so that the equipment can quickly reach the vacuum degree required for the test, thereby improving the detection efficiency.

[0064] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A sampling device for a time-of-flight mass spectrometer, characterized in that: The sample injection device comprises: A shell, wherein a first injection port and a second injection port are respectively provided at two ends of the shell, an injection channel connecting the first injection port and the second injection port is formed inside the shell, the first injection port is connected to an external space, and the second injection port is connected to a vacuum chamber of the time-of-flight mass spectrometer; a door body, the door body being arranged at the first sample inlet, comprising a door plate and a sealing block, the sealing block being located at the inner side of the door plate and movably connected to the door plate, the door plate being pivotally connected to the housing to drive the sealing block to open and close the first sample inlet, and the sealing block being able to block the first sample inlet after closing; A door suction assembly, the door suction assembly comprising a first magnetic suction component arranged on the door panel and a second magnetic suction component arranged on the shell, wherein the suction force generated between the first magnetic suction component and the second magnetic suction component can suck the door body onto the first injection port; An elastic component is arranged between the door plate and the sealing block to press the sealing block against the shell at the edge of the first injection port after the door body is closed.

2. The sample injection device according to claim 1, characterized in that: A guide groove is arranged on the inner side of the door panel, and the sealing block is slidably installed in the guide groove and can slide along a direction perpendicular to the door panel.

3. The sample injection device according to claim 2, characterized in that: The elastic component includes a limiting bolt and a coil spring. One end of the limiting bolt is threadedly engaged with the sealing block, and the other end of the limiting bolt is clamped with the door panel. The coil spring is sleeved on the limiting bolt.

4. The sample injection device according to any one of claims 1 to 3, characterized in that: The number of the elastic components is set to be multiple, and the multiple elastic components are distributed at intervals along the edge of the sealing block.

5. The sample injection device according to any one of claims 1 to 3, characterized in that: An extension groove is provided on the inner side of the sealing block, and the extension groove is communicated with the first injection port after the door body is closed.

6. The sample injection device according to any one of claims 1 to 3, characterized in that: The sample injection device also includes an observation window arranged on the top of the shell, and glass is installed on the observation window.

7. The sample injection device according to any one of claims 1 to 3, characterized in that: The sample injection device comprises a first spring plunger and a second spring plunger respectively arranged on both sides of the door plate, and the door plate is pivotally connected to the housing through the first spring plunger and the second spring plunger.

8. The sample injection device according to any one of claims 1 to 3, characterized in that: The sampling device further comprises a vacuum pipeline and a solenoid valve. The vacuum pipeline can connect the sampling channel with the vacuum device, and the solenoid valve can control the on and off of the vacuum pipeline.

9. The sample injection device according to any one of claims 1 to 3, characterized in that: The injection device further includes a first sealing ring, which is arranged at the edge of the first injection port, and / or the injection device further includes a second sealing ring, which is arranged at the edge of the second injection port.

10. A time-of-flight mass spectrometer, characterized in that: The time-of-flight mass spectrometer comprises the sample injection device according to any one of claims 1 to 9.

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