Portable sampler for chromatographic instrument

Abstract

The portable sampler comprises a device shell, a first assembly cavity and a second assembly cavity are formed in the device shell, a driving assembly is assembled in the first assembly cavity, a connecting block is integrally formed at the bottom of the first assembly cavity, a liquid storage pipe is assembled in the second assembly cavity, and a liquid outlet is formed in the liquid storage pipe. A first sealing ring is fixedly assembled at the bottom of the connecting groove, and a liquid suction pipe is fixedly connected to the bottom of the liquid storage pipe. According to the utility model, the liquid storage tube is arranged, so that the solution for sampling the liquid every time can be increased, the times of repeated sampling required by adding the liquid sample into the chromatograph are reduced, the use process is simpler, more convenient and quicker, and meanwhile, the disposable liquid storage tube is adopted, so that after the sampling operation of the liquid sample is completed, the sampling time is shortened, and the sampling efficiency is improved. The liquid storage pipe can be replaced, so that the cleanliness of the liquid storage pipe is kept when other liquid samples are sampled next time, cross mixing among the liquid samples is avoided, and the accuracy of detecting and analyzing the liquid samples by a subsequent chromatograph is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sampler technical field, concretely relates to a hand sampler for chromatograph. BACKGROUND

[0002] Chromatograph is a device for chromatographic separation and analysis of samples. When testing and analyzing liquid samples during use, a sampler is needed to extract the liquid samples and add them to the sample inlet of the chromatograph. Traditional samplers mostly use rubber-tipped droppers to suck liquid and add it to the chromatograph. However, the following shortcomings exist in using rubber-tipped droppers to sample liquid: (1) The capacity of liquid sampling is limited each time, and when a larger amount of liquid sample needs to be added to the chromatograph, multiple sampling operations are required; (2) Liquid samples are prone to residual in the rubber-tipped dropper, and the residual liquid samples will mix into the newly sampled samples during subsequent sampling, thereby affecting the test and analysis results of the chromatograph. Therefore, we propose a hand sampler for chromatograph. SUMMARY

[0003] The utility model aims at providing a hand sampler for chromatograph to solve the problems in the background.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a hand sampler for chromatograph, comprising a device shell, a first assembly cavity and a second assembly cavity are formed in the device shell, a driving assembly is assembled in the first assembly cavity, a connecting block is integrally formed at the bottom of the first assembly cavity, a through hole is formed in the connecting block, a liquid storage tube is assembled in the second assembly cavity, a connecting groove is integrally formed at the top of the liquid storage tube, a first sealing ring is fixedly assembled at the bottom of the connecting groove, a liquid suction tube is fixedly connected to the bottom of the liquid storage tube, and a second sealing ring is fixedly assembled in the liquid suction tube.

[0005] Preferably, a positioning block is integrally formed on the side wall of the liquid storage tube, and a positioning groove is formed in the side wall of the second assembly cavity.

[0006] Preferably, the driving assembly comprises a driving screw, the driving screw is rotatably connected in the first assembly cavity, a piston is screwed to the outer side wall of the driving screw, a driving motor is fixedly assembled at the top of the device shell, the driving motor is fixedly connected to the top of the driving screw, a control switch is fixedly assembled on the side wall of the device shell, and the output end of the control switch is electrically connected to the input end of the driving motor.

[0007] Preferably, a scale is formed on the side wall of the liquid storage tube.

[0008] Preferably, the bottom of the second assembly cavity is provided with a cover, the top of the cover is fixedly connected with an elastic member, the side wall of the elastic member is integrally formed with a clamping block, and the side wall of the positioning groove is provided with a clamping groove.

[0009] Compared with the prior art, the hand-held sample extractor for the chromatograph has the advantages that: compared with the traditional rubber head dropper for sampling liquid, the utility model can increase the solution for sampling liquid each time, reduce the number of repeated sampling for adding liquid samples into the chromatograph, and is more convenient and fast in use, meanwhile, the utility model adopts a disposable liquid storage tube, after completing the sampling operation of the liquid sample, the liquid storage tube can be replaced, the cleanliness of the liquid storage tube is maintained when sampling other liquid samples next time, cross mixing between liquid samples is avoided, and the accuracy of subsequent chromatograph for detecting and analyzing liquid samples is improved. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is a perspective view of the utility model.

[0011] Figure 2 It is a structural schematic view of the utility model.

[0012] Figure 3 It is a detail view of a in Figure 2

[0013] Figure 4 It is a structural schematic view of the liquid storage tube of the utility model.

[0014] Figure 5 It is a connection structure schematic view between the cover and the second assembly cavity of the utility model.

[0015] In the figure: 1, device shell; 2, first assembly cavity; 21, connecting block; 22, through hole; 3, second assembly cavity; 31, positioning groove; 32, clamping groove; 4, driving assembly; 41, driving screw; 42, piston; 43, driving motor; 44, control switch; 5, liquid storage tube; 51, connecting groove; 52, first sealing ring; 53, positioning block; 54, scale; 6, suction tube; 61, second sealing ring; 7, cover; 71, elastic member; 72, clamping block. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model.

[0017] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and​Figure 5 The utility model provides a kind of technical scheme: a portable sample extractor for chromatograph, including device shell 1, the inner chamber of device shell 1 is equipped with first assembly cavity 2 and second assembly cavity 3, first assembly cavity 2 is used to drive assembly 4 assembly, second assembly cavity 3 is used to the assembly of liquid storage tube 5, the bottom of liquid storage tube 5 is integrally formed with suction tube 6, by the action of drive assembly 4 in first assembly cavity 2, suction tube 6 can be made into liquid storage tube 5 with liquid sample and store, it is convenient for subsequent to chromatograph with liquid sample addition.

[0018] As shown in Figure 2 And Figure 3 The bottom of first assembly cavity 2 is fixedly connected with connecting block 21, and the top of liquid storage tube 5 is integrally formed with connecting groove 51. After liquid storage tube 5 is inserted into second assembly cavity 3, connecting block 21 is inserted into connecting groove 51. A through hole 22 is formed in the middle of connecting block 21, and a first sealing ring 52 is fixedly assembled at the bottom of connecting groove 51. The inner cavity of liquid storage tube 5 is connected with the inner cavity of first assembly cavity 2 by the through hole 22. The pressure in the inner cavity of first assembly cavity 2 is controlled by drive assembly 4, so that the liquid sample enters or moves out of liquid storage tube 5.

[0019] The number of connecting block 21 and connecting groove 51 is at least four. The four connecting blocks 21 and connecting grooves 51 are evenly distributed around the center of liquid storage tube 5. A positioning block 53 is integrally formed on the side wall of liquid storage tube 5. A positioning groove 31 is formed on the side wall of second assembly cavity 3. The cooperation of positioning block 53 and positioning groove 31 can improve the convenience of liquid storage tube 5 during assembly. When liquid storage tube 5 is assembled with second assembly cavity 3, connecting block 21 is inserted into connecting groove 51.

[0020] As shown in Figure 2 Drive assembly 4 includes a drive screw 41, which is rotatably connected in first assembly cavity 2. A piston 42 is screwed to the outer side wall of drive screw 41. A limiting block is integrally formed on the side wall of piston 42. A limiting groove is integrally formed on the inner cavity side wall of first assembly cavity 2. The limiting block is slidably connected in the limiting groove. The rotation of drive screw 41 can make piston 42 move up and down in first assembly cavity 2. A drive motor 43 is fixedly assembled on the top of device shell 1. The output end of drive motor 43 is fixedly connected with the top of drive screw 41 through a shaft coupling. Drive motor 43 drives drive screw 41 to rotate in first assembly cavity 2. A control switch 44 is fixedly assembled on the side wall of device shell 1. Control switch 44 is electrically connected with drive motor 43. Control switch 44 can control the opening and closing of drive motor 43 and the rotation direction. Drive motor 43 is electrically connected with external power supply or powered by a battery arranged in device shell 1.

[0021] AsFigure 2 And Figure 4 As shown in FIG. 6, the inner cavity of the pipette 6 is fixedly fitted with a second sealing ring 61. The second sealing ring 61 is arranged to seal the pipette 6, so as to avoid leakage of the liquid sample from the pipette 6 when the liquid sample is not subjected to external pressure. The liquid storage tube 5 and the pipette 6 can be injection molded from a disposable transparent plastic material, and can be replaced in time after sampling of the liquid. The side wall of the liquid storage tube 5 is integrally formed with a scale table 54. The scale table 54 is arranged to facilitate observation of the amount of liquid sample entering the liquid storage tube 5.

[0022] As shown in FIG. 6, the bottom of the second assembly cavity 3 is fitted with a cover 7. The middle portion of the cover 7 is provided with an opening for the pipette 6 to pass through. The cover 7 is arranged to limit and fix the assembly position of the liquid storage tube 5 and the second assembly cavity 3, so as to improve the stability of the assembly position between the liquid storage tube 5 and the second assembly cavity 3, and also improve the air tightness of the connection between the connecting block 21 and the connecting groove 51. Figure 1 Figure 5 The top of the cover 7 is fixedly fitted with an elastic member 71 which is left-right symmetrical. The side wall of the elastic member 71 is integrally formed with a clamping block 72 which is inserted into a clamping groove 32. The clamping groove 32 is arranged on the side wall of the positioning groove 31. The clamping block 72 and the clamping groove 32 are arranged to achieve detachable fixed connection between the cover 7 and the second assembly cavity 3. The elastic member 71 is arranged to facilitate disassembly and assembly of the bottom of the cover 7 and the second assembly cavity 3, and facilitate replacement of the liquid storage tube 5.

[0023] The top of the cover 7 is fixedly fitted with an elastic member 71 which is left-right symmetrical. The side wall of the elastic member 71 is integrally formed with a clamping block 72 which is inserted into a clamping groove 32. The clamping groove 32 is arranged on the side wall of the positioning groove 31. The clamping block 72 and the clamping groove 32 are arranged to achieve detachable fixed connection between the cover 7 and the second assembly cavity 3. The elastic member 71 is arranged to facilitate disassembly and assembly of the bottom of the cover 7 and the second assembly cavity 3, and facilitate replacement of the liquid storage tube 5.

[0024] Working principle: The device is used for sampling operation when the liquid sample of the chromatograph is injected. First, the unused liquid storage tube 5 is taken out, and the liquid storage tube 5 is inserted into the second assembly cavity 3. During the process of inserting the liquid storage tube 5 into the second assembly cavity 3, the connecting block 21 can be inserted into the connecting groove 51 due to the cooperation of the positioning block 53 and the positioning groove 31. Then, the cover 7 is clamped to the bottom of the second assembly cavity 3 to limit and fix the position of the liquid storage tube 5. The pipette 6 is inserted into the liquid sample. The driving motor 43 is started by controlling the switch 44, and the driving motor 43 drives the driving screw 41 to move, so that the piston 42 moves upward in the first assembly cavity 2. The air above the piston 42 is discharged from the top of the first assembly cavity 2, and the first assembly cavity 2 is in a negative pressure state, so that the air in the liquid storage tube 5 enters the first assembly cavity 2. The liquid sample is sucked into the liquid storage tube 5 through the pipette 6 for storage. Subsequently, the pipette 6 is aligned with the sample inlet of the chromatograph, the driving motor 43 is controlled to move in the opposite direction, the piston 42 moves downward in the first assembly cavity 2, and the liquid sample in the liquid storage tube 5 and the pipette 6 is added to the chromatograph for data testing. After use, the liquid storage tube 5 can be replaced to maintain the cleanliness of the liquid storage tube 5, avoid repeated use of the liquid storage tube 5, and improve the accuracy of the liquid sample test.​

Claims

1. A manual sample extractor for a chromatograph, comprising a housing (1), characterized in that: The device housing (1) has a first assembly cavity (2) and a second assembly cavity (3). The first assembly cavity (2) is equipped with a drive assembly (4). The bottom of the first assembly cavity (2) is integrally formed with a connecting block (21). The connecting block (21) has a through hole (22). The second assembly cavity (3) is equipped with a liquid storage tube (5). The top of the liquid storage tube (5) is integrally formed with a connecting groove (51). The bottom of the connecting groove (51) is fixedly equipped with a first sealing ring (52). The bottom of the liquid storage tube (5) is fixedly connected with a suction tube (6). The suction tube (6) is fixedly equipped with a second sealing ring (61).

2. The manual sample extractor for a chromatograph according to claim 1, characterized in that: The side wall of the liquid storage tube (5) is integrally formed with a positioning block (53), and the side wall of the second assembly cavity (3) is provided with a positioning groove (31).

3. The manual sample extractor for a chromatograph according to claim 1, characterized in that: The drive assembly (4) includes a drive screw (41) which is rotatably connected to the first assembly cavity (2). A piston (42) is screwed onto the outer side wall of the drive screw (41). A drive motor (43) is fixedly mounted on the top of the device housing (1). The drive motor (43) is fixedly connected to the top of the drive screw (41). A control switch (44) is fixedly mounted on the side wall of the device housing (1). The output end of the control switch (44) is electrically connected to the input end of the drive motor (43).

4. A manual sample extractor for a chromatograph according to claim 1, characterized in that: The side wall of the liquid storage tube (5) is provided with a scale (54).

5. A manual sample extractor for a chromatograph according to claim 2, characterized in that: The bottom of the second assembly cavity (3) is fitted with a cover (7), the top of the cover (7) is fixedly connected with an elastic element (71), the side wall of the elastic element (71) is integrally formed with a locking block (72), and the side wall of the positioning groove (31) is provided with a locking groove (32).

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