CN202024983U - Sample handling device for trace amount detecting instrument and trace amount detecting instrument with same - Google Patents

Abstract

The utility model provides a sample handling device for a trace amount detecting instrument, which comprises a sample handling chamber which is arranged in the sampling handling device and is used for enabling a sample to be desorbed from a sampling handling piece, and a valve assembly which is used for enabling the sample handling chamber and migration tube fluid of the trace amount detecting instrument to be communicated in the sample handling process. By adopting the structure, for example, by improving the transmission efficiency of the sample, the sensitivity of a detector can be improved, and simultaneously the separation of the inner environment of a migration tube and the outer environment can be realized, thus preventing a migration area to be polluted, and being capable of keeping important parameters such as sensitivity, material peak position, resolution ratio and the like, so as to realize the stability and the consistency of the instrument.

Description

Sampling device for trace detector and trace detector with same

technical field

The utility model relates to a sample feeding device for a trace detector and a trace detector with the sample feeding device.

Background technique

In the current security inspection market, ion migration technology is mainly used to detect dangerous goods (such as explosives, drugs). In the instruments using this technology, there is a sampling device, which can perform gasification analysis on the incoming solid particles or gases, and then the gasified sample molecules enter the ionization area under the guidance of the gas flow, and are The ionized sample molecules enter the migration zone, and the molecular identification is realized according to the difference of flight time. At present, most instruments on the market use semi-permeable membranes, which can isolate the inside of the transfer tube from the external environment, prevent dust and impurity molecules from entering the transfer tube, and achieve the purpose of "cleaning" the inside of the transfer tube. Molecules with certain characteristics (generally macromolecules) can pass through the semipermeable membrane and enter the inside of the transfer tube. The semipermeable membrane has a certain transmittance, and the general transmittance is only about 10%, so most of the sample molecules are lost outside the semipermeable membrane, and few sample molecules enter the transfer tube, which leads to the sensitivity of the instrument. At the same time, the semi-permeable membrane can generally work at high temperature, which requires the system to provide it with an additional working environment and additional heat, which increases the working power of the system. If the instrument is portable, it will reduce the use of batteries time. For detectors that do not use translucence, since the migration area is directly connected to the atmospheric environment, the internal environment is easily polluted, resulting in relatively complex background peaks. And with the change of the external environment, the change of the material peak is also very large, and the peak position is very unstable, which seriously restricts the stability of the measurement.

Utility model content

The purpose of the present utility model is to provide a sample injection device for a trace detector such as a mobility spectrometer (IMS) and a trace detector such as a mobility spectrometer (IMS) with the sampling device. With this sampling device, the sensitivity of trace detectors such as mobility spectrometers (IMS) is increased.

According to one aspect of the utility model, the utility model provides a sample feeding device for a trace detector, the sample feeding device includes: a device for desorbing the sample from the sample feeding device arranged in the sample feeding device a sampling chamber; and a valve assembly for fluidly communicating the sampling chamber with the transfer tube of the trace detector when a sample is injected.

According to an aspect of the utility model, the valve assembly includes a closing part; and a flange part arranged on the inner wall of the sampling chamber, through the contact and separation of the closing part and the flange part, the sampling chamber and the The transfer tube of the trace detector is fluidly connected and isolated.

According to an aspect of the present invention, the flange portion divides the sampling chamber into a first sampling chamber and a second sampling chamber, the first sampling chamber is used for fluid communication with the trace detector, and the second sampling chamber is used for fluid communication with the trace detector. The sample chamber is used to desorb the sample from the sample injection part, and the first sample injection chamber and the second sample injection chamber are in fluid communication or isolated through the contact or separation of the sealing part and the flange part.

According to an aspect of the present utility model, the sampling device further includes a sampling port, and the sampling port communicates with the second sampling chamber.

According to an aspect of the present invention, while the first sample injection chamber and the second sample injection chamber are in fluid communication by separating the closure member from the flange portion, the second sample injection chamber is isolated from the injection port, by This isolates the first and second sampling chambers from the outside.

According to one aspect of the present invention, the closure member includes a columnar portion; a head connected to the columnar portion, the head having an annular groove; and a sealing ring arranged in the annular groove, the sealing ring is used to contact The flange part is used to isolate the first sampling chamber from the second sampling chamber.

According to an aspect of the present utility model, the sampling device further includes: a driving member, the driving member is used to move the closing member to make fluid communication or isolation between the first sampling chamber and the second sampling chamber.

According to an aspect of the present utility model, the driving member includes: a moving frame, the moving frame has opposite substantially parallel outer walls, and sliding columns arranged on the opposite substantially parallel outer walls, wherein the moving frame is connected to the closing member The columnar part is connected; the driving frame has a groove, and the sliding column is slidably arranged in the groove, so that when the driving frame moves, the moving frame is driven to move through the cooperation of the sliding column and the groove, thus The closing part is moved.

According to one aspect of the utility model, the utility model provides a trace detector, which includes: the above-mentioned sample feeding device; a transfer tube, used to ionize and charge the sample from the sample feeding device and migration; and a Faraday disk to collect ionized charged samples.

By adopting the above-mentioned structure, the utility model can, for example, increase the sensitivity of the detection device by increasing the transmittance of the sample. At the same time, the internal environment of the migration tube is isolated from the external environment, avoiding the contamination of the migration area, and keeping important parameters such as the sensitivity of the instrument, the peak position of the material, and the resolution unchanged, thereby realizing the stability and consistency of the instrument.

According to one aspect of the present invention, the sampling device includes a linkage device, a separate sampling chamber (sealed air chamber), a sample molecular analysis device, and a sampling port. The sealed sampling chamber is directly connected with the internal gas path of the transfer tube. This sampling device can control whether the sealed sampling chamber is connected to the outside atmosphere. Isolation, at this time, the internal gas path of the transfer tube is in a sealed state and isolated from the external environment. Driven by an external signal (sampling trigger), the linkage device is activated. After activation, the "sealed sampling chamber" communicates with the outside atmosphere, so that the external sample molecules can be directly brought into the transfer tube, and the sample molecules enter the transfer tube. After the interior, it is first ionized, and the charged sample molecules are collected by the Faraday disk after passing through the migration area, and the samples are identified by the time of flight.

Since the sampling device does not use a semi-permeable membrane or a device with a specific permeability, the sample molecules (analyzed or gas samples) can enter the transfer tube without hindrance, which greatly improves the sampling efficiency, thus fundamentally Improved sensitivity. At the same time, the "sealed sampling chamber" can keep the inside of the transfer tube in a sealed state (non-sampling state) for a long time, preventing impurity substances from entering the transfer tube, and the transfer tube can be kept in a "clean" state, thereby ensuring the protection of the transfer tube from substances. Resolving power and remain consistent in different environments.

Description of drawings

Fig. 1 is a schematic perspective view of a sampling device according to an embodiment of the present invention.

Fig. 2 is a schematic perspective view of a cutaway state of the sampling device shown in Fig. 1 .

FIG. 3 is a schematic perspective view of a sealed sample injection chamber assembly of the sample injection device shown in FIG. 1 .

FIG. 4 is a schematic perspective view of a cut-away state of the airtight sampling chamber assembly shown in FIG. 3 .

Fig. 5 is a schematic perspective view of a cutaway state of the sampling device shown in Fig. 1 when no sample is being injected.

Fig. 6 is a schematic perspective view of the closing part of the sampling device shown in Fig. 1 .

Fig. 7 is a schematic perspective view of the platform of the sampling device shown in Fig. 1 .

Fig. 8 is a schematic perspective view of the closing component support of the sampling device shown in Fig. 1 .

Fig. 9 is a schematic perspective view of the moving frame of the sampling device shown in Fig. 1 .

Fig. 10 is a schematic perspective view of an assembled state of the closing part, the closing part support and the moving frame.

Fig. 11 is a schematic perspective view of the driving frame of the sampling device shown in Fig. 1 .

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

With reference to Fig. 1-11, according to the utility model such as the trace detector of mobility spectrometer, comprises: sampling device 100; Migration pipe, is used to make the sample from sampling device 100 carry out ionization charge and migration; And collect A Faraday disk that ionizes charged samples.

As shown in Figures 1-11, the sampling device 100 includes: a sampling chamber 10 arranged in the sampling device 100 for desorbing the sample from the sample; Valve assembly 20 in fluid communication with the transfer tube of the trace detector. As shown in Figures 3-4, the sample injection chamber 10 is composed of a sample injection chamber assembly 12, and a sample inlet 14 is formed in the sample injection chamber assembly 12. In addition, a gas path 16 communicated with the transfer tube is formed in the sample injection chamber assembly 12. and communicate with the sampling chamber 10.

As shown in FIGS. 1-11 , the sampling device 100 further includes: a driving frame 30 , a heating assembly 40 , and a table body 50 . As shown in FIGS. 1 and 2 , the internal gas path of the transfer tube is connected to the sampling port through a sealed sampling chamber 10 .

The valve assembly 20 includes a closing part 22; and a flange part 24 arranged on the inner wall of the sampling chamber 10, through the contact and separation of the closing part 22 and the flange part 24, the sampling chamber 10 is separated from the trace. The transfer tube of the volume detector is fluidly connected and isolated. The flange portion 24 divides the sampling chamber 10 into a first sampling chamber 101 and a second sampling chamber 102 , the first sampling chamber 101 is used for fluid communication with the trace detector, that is, the gas path 16 . The second sample injection chamber 102 is used to desorb the sample from the sample injection part, and the first sample injection chamber 101 and the second sample injection chamber 102 are in fluid communication or isolation. The sampling port 14 communicates with the second sampling chamber 102 .

As shown in Figure 6, the closure member 22 includes a cylindrical portion 221; a head 222 connected to the cylindrical portion, the head has an annular groove 223; and a sealing ring 224 (Figure 4) arranged in the annular groove 223, The sealing ring 224 is used to contact the flange portion 24 to isolate the first sample injection chamber 101 from the second sample injection chamber 102 .

The sample chamber assembly 12 includes a bracket 17 and a top cover 18 . The first sampling chamber 101 is formed by a sealing ring 19 , a closing member 22 , a flange portion 24 , a top cover 18 , and a bracket 17 . The sealing ring is a ring made of rubber (such as medical silicone rubber, fluorine rubber) or polytetrafluoroethylene. Closing part 22 as shown in Figure 6, head 222 has pot shape, and there is a groove 223 in the middle of pot shape, is used for placing sealing ring 224; There is a groove at the bottom for placing the sealing ring 19 , and the top cover 18 seals between the rubber sealing ring 19 and the bracket 17 , thereby sealing the space of the first sampling chamber 101 .

Support 17 is hollow and has multiple functions, and it is the supporting frame of whole sampling device, and it comprises sampling port 14, sampling chamber 10, and the hollow part forms sampling chamber 10, and there is a boss or in the middle of sampling chamber Flange part 24, in Fig. 4, above the boss 24 is referred to as the first sampling chamber 101, hereafter referred to as the second sampling chamber 102, the first sampling chamber 101 communicates with the inside of the transfer tube through an air hole, the second sampling chamber The sample chamber 102 is directly connected to the sample inlet 14 , the sample inlet 14 is formed by a rectangular space, and its upper part directly communicates with the second sample chamber 102 . When not working, the sealing member 22 is subjected to downward force and causes the sealing ring 224 to be pressed on the boss 24 inside the bracket, and at this moment the first sampling chamber 101 and the second sampling chamber 102 are isolated, and there is a gap between them. There is no gas flow, as shown in Figure 5.

The bracket 17 is fixed on the side of the main platform body 50 by side screws, and is used as an integral bracket, as shown in FIG. 7 . The columnar portion 221 of the closing part 22 is fixed on the closing part support 20 (by screws), and the closing part support 70 (shown in Figure 8) is fixed on two screw holes 63 at the center of the mobile frame 60 (as shown in Figure 9), As shown in Figure 9. The moving frame 60 is fixed to the heating assembly 40 through four screw holes 62 at its four corners, and the heating assembly 40 is provided with a casing and a heating element arranged in the casing. The housing can be a PTFE heater jacket.

Therefore, the closing part 22, the closing part support 70, the moving frame 60, and the heating assembly 40 are fixed as a whole and move up and down simultaneously. There are four sliding columns 61 on the side of the moving frame 60, and the sliding columns are placed in the grooves 31 of the driving frame 30 (as shown in Figure 11). When the driving frame 30 slides in the same horizontal plane, the moving frame 60 will move up and down accordingly. , thereby causing the closing member 22 to move up and down. The driving frame 30 is externally connected with a power source (such as a motor), and under the action of an external force, the driving frame 30 moves horizontally.

The heater can be located inside the heating jacket, and its composition can be electric heating, laser and other heating methods. When there is no sample injection, the heater is at normal temperature, or it can be in a semi-heating state, that is, its temperature is lower than the thermal analysis temperature. When the sample is injected, the sampling device starts to work, and it can quickly heat the sample test paper to a high temperature, so that the sample on the test paper is rapidly thermally decomposed into gas.

When the sampling device is not working (that is, when no sample is injected), the first sampling chamber 101 is isolated from the external environment, and the state of the system is shown in Figure 5. At this time, the inside of the transfer tube is isolated from the outside, and the inside of the transfer tube can be kept clean. , High temperature environment, not affected by the external environment gas. When the sampling device was working, the sampling test paper with the sample was inserted into the sampling device from the sampling port 14, and the sampling test paper was placed on the top surface of the moving frame 60, and the bottom of the moving frame 60 was arranged at the position 90. The sensor can send a trigger signal to the system, and the system transmits this signal to the power source (such as a motor), and the power source (such as a motor) translates the driving frame 30, so that the mobile frame 60 with the sample test paper is lifted (the driving frame 30 is lifted by the low groove 311 rises to the height of the high groove 312), at this time the closing member 22 is lifted to the top from the bottom end of the sealed sampling chamber 10, and the first sampling chamber 101 communicates with the outside world, causing the transfer tube to communicate with the outside world, while the moving frame 60 The top surface of the second injection chamber 102 is in contact with the bottom surface of the bracket 17, so that the second injection chamber 102 is isolated from the injection port 14, that is, the injection chamber 10 is isolated from the outside. At the same time as receiving the trigger signal (or after a certain delay), the heating element at the bottom starts to work through heat radiation, convection, etc., and quickly vaporizes and analyzes the sample on the sample test paper. Both sides of the component holder 70 enter the first sample injection chamber 101, and then enter the ionization area inside the transfer tube through the air hole, where the sample molecules are ionized and charged, and then the charged sample enters the ionization area under the action of the electric field Migration regions, depending on the time of flight, different molecules were identified.

In the above manner, while the first injection chamber and the second injection chamber are in fluid communication by separating the closure member from the flange portion, the second injection chamber is isolated from the injection port, thereby making the first The sampling chamber and the second sampling chamber are isolated from the outside. Obviously, this scheme can be implemented in various ways. For example, a second valve assembly can be provided, and the second valve assembly is used to make the second injection chamber communicate with or isolate the fluid from the injection port. While the sample chamber is in fluid communication with the second sample injection chamber, the second sample injection chamber is isolated from the sample inlet. Therefore, the utility model is not limited to the above specific embodiments.

In addition, in the figure, the moving frame 60 and the like move up and down, but this is only for the convenience of description, and the moving frame 60 and the like can move in any direction.

Furthermore, the sampling test paper may not be placed on the top surface of the mobile rack 60, but placed in the sample sampling test paper fixing part provided on the mobile rack 60, thus although the mobile rack 60 does not move up and down, but for example left and right Move, sample injection test paper also can not come off from moving rack 60.

In the above embodiment, the top surface of the moving frame 60 is in contact with the bottom surface of the frame 17, isolating the second injection chamber 102 from the injection port 14 (in this case, the moving frame 60 has no central hole). However, the mobile frame 60 can have a central hole as shown in the figure. After the sample injection test paper is inserted into the sample inlet, the first sample injection chamber 101 communicates with the second sample injection chamber 102, and the first sample injection chamber 101 communicates with the second sample injection chamber. The sampling chamber 102 is separated from the external environment by a test paper, and the first sampling chamber 101 and the second sampling chamber 102 can exchange gas with the external environment.

Claims (10)

1. a sampling device that is used for trace quantity detector is characterized in that, the described sampling device that is used for trace quantity detector comprises:

Being arranged on being used in the sampling device makes the Sample Room of sample from sample introduction spare desorption; And

Be used for valve member that Sample Room is communicated with the migration tube fluid of trace quantity detector.

2. the sampling device that is used for trace quantity detector according to claim 1 is characterized in that described valve member comprises packaged unit; And be arranged on bead part on the inwall of Sample Room, the contact by this packaged unit and described bead part with separate, make the migration tube fluid connected sum isolation of Sample Room and trace quantity detector.

3. the sampling device that is used for trace quantity detector according to claim 2, it is characterized in that, described bead part is divided into first Sample Room and second Sample Room with described Sample Room, first Sample Room is used for being communicated with the trace quantity detector fluid, second Sample Room is used to make sample introduction spare desorption sample, contact by this packaged unit and described bead part or separate is communicated with first Sample Room and the second Sample Room fluid or isolates.

4. the sampling device that is used for trace quantity detector according to claim 3 is characterized in that described sampling device also comprises injection port, and described injection port communicates with described second Sample Room.

5. the sampling device that is used for trace quantity detector according to claim 3 is characterized in that described packaged unit comprises stylolitic part; The head that is connected with stylolitic part, this head has annular groove; And being arranged on O-ring seal in this annular groove, the sealing circle is used to contact described bead part, so that first Sample Room and second Sample Room are isolated.

6. the sampling device that is used for trace quantity detector according to claim 5 is characterized in that, described sampling device also comprises:

Actuator, this actuator are used for moving described packaged unit, first Sample Room and the second Sample Room fluid are communicated with or isolation.

7. the sampling device that is used for trace quantity detector according to claim 6 is characterized in that, described actuator comprises:

Movable stand, this movable stand have the parallel outer wall of relative cardinal principle, and are arranged on the traveller on the parallel outer wall of relative cardinal principle, and wherein movable stand is connected with the stylolitic part of described packaged unit;

Bogie, this bogie has groove, and traveller is slidably disposed in the groove, thus when bogie moves, by cooperating of traveller and groove, drives movable stand and moves, and moves described packaged unit thus.

8. the sampling device that is used for trace quantity detector according to claim 4, it is characterized in that, partly separate by packaged unit and described bead first Sample Room and the second Sample Room fluid are communicated with in, second Sample Room and described injection port are isolated, and make first Sample Room and second Sample Room and external isolation thus.

9. a trace quantity detector is characterized in that, described trace quantity detector comprises:

Sampling device according to claim 1;

Migration tube is used to make the sample from sampling device to carry out the charged and migration of ionization; And

Collect faraday's dish of the charged sample of ionization.

10. trace quantity detector according to claim 9 is characterized in that, described trace quantity detector is the mobility spectrometer.

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