CN210199036U

CN210199036U - Injector for trace substance analysis

Info

Publication number: CN210199036U
Application number: CN201920986778.2U
Authority: CN
Inventors: Jie Zhu; 朱洁; Yuan Hu; 胡园; Zhaosheng Zhou; 周朝生; Aiying Ke; 柯爱英; Rongmao Lu; 陆荣茂
Original assignee: Zhejiang Mariculture Research Institute
Current assignee: Zhejiang Mariculture Research Institute
Priority date: 2019-06-27
Filing date: 2019-06-27
Publication date: 2020-03-27
Anticipated expiration: 2029-06-27

Abstract

The utility model discloses an injector for trace substance analysis, including injection apparatus and filter, injection apparatus is including the electric putter that from top to bottom sets gradually, a fixed block for installing electric putter, injection cavity and suction injection joint, one side of fixed block is provided with the thing hole of putting with holding electric putter, it inhales the row cavity to have solution in the injection cavity, be equipped with between fixed block and the injection cavity and be used for separating the thing hole of putting, the sealing member of solution suction row cavity, solution suction row cavity is equipped with the spring, the one end of spring is fixed in the bottom of solution suction row cavity, the other end and sealing member looks butt, suction injection joint one side is provided with the suction row passageway that is linked together with solution suction row cavity, electric putter's free end stretches into puts that the thing is downthehole to exert pressure the sealing member and makes the pressure size of solution suction row cavity change. The utility model discloses an injector avoids the leading-in inside lining pipe of injection to run off, filters in to the injection simultaneously, avoids the chromatographic column to block up.

Description

Injector for trace substance analysis

Technical Field

The utility model relates to a syringe especially relates to a syringe for trace substance analysis.

Background

With the development of agricultural industrialization, the production of agricultural products increasingly depends on pesticides, antibiotics, hormones and other substances to obtain more industrial values. Due to excessive throwing, the level of corresponding substances in the environment and agricultural products exceeds the limit, and the quality and safety of the agricultural products are seriously threatened. Therefore, the quality safety of agricultural products is guaranteed, the accurate analysis of the trace substance level in the environment or the agricultural products is the basis, and the pretreatment method is the premise.

The hormones in the aquatic products are mainly divided into exogenous hormones and endogenous hormones, and the exogenous hormones are remained in the aquatic products due to improper use or abuse of the exogenous hormones, so that certain harm is caused to human health. The content of endogenous hormones in the aquatic products is related to the growth environment, edible baits and ripening promoting modes of the growth and development of the aquatic products (generally, the endogenous hormones are in parts per million and belong to the field of trace analysis), and a reasonable and efficient pretreatment mode is the premise of trace substance analysis.

According to the existing standard GB/T21981-2008 'method for detecting hormone multi-residue in animal-derived food, liquid chromatography-mass spectrometry/mass spectrometry', a gas chromatograph or a liquid-phase spectrometer can be used for detection. The analysis steps can be divided into: sample preparation, extraction, purification, concentration and measurement, wherein after concentration, a volume of 2ml is required to be added into an automatic sample bottle for chromatographic measurement. If the sample solution after volume fixing is filtered by a 0.22 mu m filter membrane, the measurement is carried out to remove tiny particles in the solvent so as to avoid blocking the chromatographic column.

However, for the detection of hormone or veterinary drug residues, especially trace substances, due to the low background concentration, the volume-fixing volume is correspondingly reduced during volume fixing to improve the concentration of the solution to be detected, which is convenient for analysis and quantification, but the liquid level cannot be raised due to the small sample volume of the solvent, which is inconvenient for detection and analysis by a chromatograph. Therefore, the prior art adds a sample lining tube in the sampling bottle to raise the liquid level of the solvent, wherein the lining tube is positioned in the sampling bottle, and the opening direction of the lining tube is the same as that of the sampling bottle. The inner diameter of the pipe orifice of the lining pipe is smaller than that of the sample inlet bottle, so that the liquid level of the solvent can be lifted, and the chromatograph can conveniently perform detection and analysis. However, since the orifice of the lining tube is reduced, the liquid is very easy to stay at the orifice of the lining tube due to the self-tension when entering the lining tube, and further the subsequent solution cannot enter the lining tube, even overflows, so that the improvement is needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming prior art's not enough, providing a syringe for trace substance analysis, this syringe can avoid the leading-in inside lining pipe of injection to run off, can filter the foreign matter and the particle in the injection simultaneously, and the filter effect is good and can avoid the chromatographic column to block up.

The utility model adopts the following technical scheme: an injector for analyzing trace substances comprises an injection device and a filter, wherein the injection device comprises an electric push rod, a fixed block, an injection cavity and an absorption and injection joint, the electric push rod is sequentially arranged from top to bottom, the fixed block is used for installing the electric push rod, one side of the fixed block is provided with a material placing hole for containing the electric push rod, a solution absorption and discharge cavity is arranged in the injection cavity, a sealing element for separating the material placing hole and the solution absorption and discharge cavity is arranged between the fixed block and the injection cavity, a spring is arranged in the solution absorption and discharge cavity, one end of the spring is fixed at the bottom of the solution absorption and discharge cavity, the other end of the spring is abutted against the sealing element, one side of the absorption and injection joint is provided with an absorption and discharge channel communicated with the solution absorption and discharge cavity, and the free end of the electric push rod stretches into the material placing hole to exert pressure on the sealing element so that the space, one side of the suction-injection joint is in plug-in fit with the filter, and one side of the filter, which is far away from the suction-injection joint, is provided with a suction-injection liquid port.

As an improvement, one end of the filter, which is far away from the injection device, is provided with a drainage tube matched with the liquid suction and injection port, the openings at the two ends of the drainage tube are of a structure with a large upper part and a small lower part, and the cross section of one side, matched with the sample injection bottle, of the drainage tube is smaller than the cross section of one side, matched with the liquid suction and injection port, of the filter.

As an improvement, the sealing element is made of rubber materials.

As an improvement, the filter comprises a shell, a communicating cavity which can be communicated with the suction and injection joint is arranged in the shell, one side of the shell is detachably connected with a microporous filtering component, and one side of the shell is also provided with a abdicating groove which can be matched with the microporous filtering component; when the microporous filter component is inserted into the abdicating groove, the microporous filter component is arranged in the communicating cavity and matched with the suction and injection joint, and one side of the shell is provided with a connecting port which can be matched with the suction and injection joint in an inserting way.

As an improvement, the microfiltration subassembly is including with inhaling annotate the matched with microfiltration membrane of joint to and the last filter membrane support, the lower filter membrane support of mutually supporting, it all is the circle body form to go up filter membrane support and lower filter membrane support to be equipped with the net that is used for setoff microfiltration membrane in the middle part of circle body, microfiltration membrane is a lamellar body, arranges in go up between filter membrane support and the lower filter membrane support and with net position phase-match.

As an improvement, the filter also comprises a cartridge used for installing the microporous filter component, the cartridge comprises a holding block which is protruded out of the shell and can be held by a human hand, and a membrane ring positioned in the communicating cavity, the microporous filter component is arranged in the membrane ring and is fixed with the membrane ring in a hot-pressing mode, and a connecting block is arranged between the membrane ring and the holding block.

As an improvement, the electric push rod adopts a servo motor type electric push rod or an electric push rod with a coding motor.

The utility model has the advantages that: the utility model discloses be different from current syringe that adopts the mode of injecting, through the change of electric putter free end to match to the sealing member ejecting and with the spring, in order to inhale the inside pressure of row's cavity through changing solution, reach the function of suction liquid. The standard stroke of the conventional electric push rod is between 100 and 400mm, but the maximum thrust of the conventional electric push rod on a sealing element can reach 6000N, so that the electric push rod has the characteristics of controllable stroke and high thrust, and when the pesticide residue detection environment carries out constant volume on a sample injection bottle, an external solution is firstly absorbed through a large stroke, and then the solution in a solution absorption and discharge cavity is slowly discharged step by controlling the stroke of the electric push rod. The discharged solution was directly introduced into the sampling flask.

When the solution sucking and discharging device is used, the free end of the electric push rod is used for ejecting the sealing piece to enable the space in the solution sucking and discharging cavity to be reduced and the spring to be extruded, then the liquid sucking and injecting port is stretched into the solution to be sucked, then the electric push rod is started, the free end of the electric push rod is retracted, the space of the solution sucking and discharging cavity is enlarged under the action of the spring, and negative pressure is formed in the solution sucking and discharging cavity to suck external solution. When liquid needs to be removed, the free end of the electric push rod extends out, the sealing piece is ejected out again, the spring is compressed, the space in the solution suction and discharge cavity is reduced, the pressurization is realized, the solution is favorably filtered through the filter by the pressurization, foreign matters and particles in the injection can be filtered, the filtering effect is good, and the blockage of the chromatographic column can be avoided. By adopting the method, the operation on trace liquid can be realized.

Drawings

Fig. 1 is a schematic structural view of an embodiment of the present invention;

FIG. 2 is a schematic structural view of the suction-injection joint of FIG. 1 in a state of being engaged with a filter and a drainage tube;

FIG. 3 is a schematic view of the drain tube of FIG. 2 with the drain tube removed;

FIG. 4 is an exploded schematic view of the structure of FIG. 3;

FIG. 5 is a schematic diagram of the construction of the microfiltration module of FIG. 4;

fig. 6 is an exploded schematic view of the structure of fig. 5.

Reference numerals: 1. an injection device; 2. a filter; 3. an electric push rod; 4. a fixed block; 5. an injection cavity; 6. a suction-injection joint; 7. a placing hole; 8. a solution suction chamber; 9. a seal member; 10. a spring; 11. a suction channel; 12. a liquid sucking and injecting port; 13. a drainage tube; 14. a housing; 15. a communicating cavity; 16. a microporous filtration module; 17. a connecting port; 18. a yielding groove; 19. a microporous filtration membrane; 20. an upper filter membrane bracket; 21. a lower filter membrane support; 22. a grid; 23. a cartridge; 24. a holding block; 25. a film ring; 26. and (4) connecting the blocks.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

As shown in fig. 1-6, an injector for trace substance analysis comprises an injector 1 and a filter 2, the injector 1 includes an electric push rod 3 sequentially arranged from top to bottom, a fixing block 4 for installing the electric push rod 3, an injection cavity 5 and an injection sucking joint 6, one side of the fixing block 4 is provided with a material placing hole 7 for accommodating the electric push rod 3, a solution suction and discharge cavity 8 is arranged in the injection cavity 5, a sealing member 9 for separating the material placing hole 7 and the solution suction and discharge cavity 8 is arranged between the fixing block 4 and the injection cavity 5, a spring 10 is arranged in the solution suction and discharge cavity 8, one end of the spring 10 is fixed at the bottom of the solution suction and discharge cavity 8, and the other end of the spring is abutted against the sealing member 9. One side of the suction-injection joint 6 is provided with a suction-discharge channel 11 communicated with the solution suction-discharge chamber 8, and the free end of the electric push rod 3 extends into the object placing hole 7 to pressurize the sealing element 9, so that the space size of the solution suction-discharge chamber 8 is changed to change the pressure in the solution suction-discharge chamber 8, thereby completing the suction-discharge action. And the spring 10 helps the sealing member 9 to return to the original state without the application of force by the electric push rod 3. One side of the suction-injection joint 6 is in insertion fit with the filter 2, and one side of the filter 2 far away from the suction-injection joint 6 is provided with a suction-injection liquid port 12.

The utility model discloses be different from current syringe that adopts the mode of injecting, through the change of 3 free ends of electric putter to match with spring 10 ejecting to sealing member 9, in order to inhale through changing 8 inside pressures in solution suction row cavity, reach the function of suction row liquid. The standard stroke of the existing electric push rod 3 is between 100 and 400mm, but the maximum thrust of the electric push rod to the sealing element 9 can reach 6000N, so that the electric push rod has the characteristics of controllable stroke and large thrust, and further when the pesticide residue detection environment carries out constant volume on the sample injection bottle, external solution is firstly absorbed through the large stroke, and then the solution in the solution absorption and discharge chamber 8 is slowly discharged step by step through the stroke control of the electric push rod 3. The drained solution was directed into the liner tube of the vial.

When the solution sucking and discharging device is used, the free end of the electric push rod 3 ejects the sealing piece 9 to enable the space in the solution sucking and discharging chamber 8 to be reduced and the spring 10 to be extruded, then the liquid sucking and injecting port 12 extends into the solution to be sucked, then the electric push rod 3 is started, so that the free end of the electric push rod 3 retracts, the solution sucking and discharging chamber 8 expands the space under the action of the spring 10, and negative pressure is formed in the solution sucking and discharging chamber 8 to suck external solution. When liquid needs to be removed, the free end of the electric push rod 3 extends out, the sealing piece 9 is ejected out again, the spring 10 is compressed, the space in the solution suction and discharge chamber 8 is reduced and pressurized, the pressurization is favorable for filtering the solution in the filter 2, foreign matters and particles in the injection can be filtered, the filtering effect is good, and the blockage of a chromatographic column can be avoided. By adopting the method, the operation on trace liquid can be realized.

Further, one end of the filter 2, which is far away from the injection device 1, is provided with a drainage tube 13 which is matched with the liquid sucking and injecting port 12, and the drainage tube 13 can drain the sample solution to be detected into a lining tube in the sampling bottle for constant volume. The opening at both ends that drainage tube 13 is big end up's structure, its one side cross section of fitting with the interior bushing pipe in the bottle of advancing is less than the one side cross section of inhaling the notes liquid mouth 12 matched with filter 2 department to make when the solution that filters through filter 2 and discharge passes through drainage tube 13, can carry out transient overstock in drainage tube 13 (because the inlet velocity of drainage tube 13 is greater than out the liquid speed), can be convenient for user's accurate carry out the constant volume to the bottle of advancing, give the user fault-tolerant chance, the reaction time of the fault-tolerant rescue of extension.

Further, the sealing member 9 is made of a rubber material. So that the raw material of the seal 9 is cheap, readily available and easy to process.

Furthermore, the filter 2 comprises a shell 14, a communicating cavity 15 which can be communicated with the suction-injection joint 6 is arranged in the shell 14, and a microporous filtering component 16 is detachably connected to one side of the shell 14. The housing 14 is also provided with a relief groove 18 on one side for mating with the microporous filter element 16. When the microporous filter component 16 is inserted into the offset groove 18, the microporous filter component 16 is placed in the communicating cavity 15 and is matched with the suction and injection connector 6. A connecting port 17 which can be inserted and matched with the liquid sucking and injecting port 12 is arranged at one side of the shell 14. Through with casing 14 demountable installation in the suction injection joint 6 department that is located injection apparatus 1 one end to with microporous filter component 16 demountable installation to casing 14 on, the user can change the microporous filter component 16 of corresponding aperture according to actual need, in order to satisfy the microporous filter needs of different kind chromatographic columns. Meanwhile, two microporous filter components 16 can be used in two links of liquid suction and liquid injection respectively to carry out secondary filtration on the solution to be introduced into the sample injection bottle, so that high-precision removal of tiny particles in the solution is realized, and the blockage of a chromatographic column is avoided. Therefore, after a single use, the filter 2 does not need to be discarded entirely, and only the microporous filtering component 16 needs to be replaced, so that repeated use is realized.

Further, the microfiltration component 16 comprises a microfiltration membrane 19 matched with the suction-injection joint 6, an upper filtration membrane support 20 and a lower filtration membrane support 21 which are matched with each other, wherein the upper filtration membrane support 20 and the lower filtration membrane support 21 are both in a ring shape, and a grid 22 for supporting the microfiltration membrane 19 is arranged in the middle of the ring. The microporous filtering membrane 19 is a sheet body and is arranged between the upper filtering membrane bracket 20 and the lower filtering membrane bracket 21 and matched with the grid 22 in position. When the injection device 1 is injecting a liquid, the solvent located inside the injection device 1 under pressure may be subjected to microfiltration via the filter 2.

Furthermore, the filter 2 further comprises a cartridge 23 for mounting the microporous filter module 16, the cartridge 23 comprises a holding block 24 protruding outside the housing 14 and allowing a human hand to hold the cartridge, and a membrane ring 25 located in the communicating cavity 15, the microporous filter module 16 is placed in the membrane ring 25 and fixed with the membrane ring 25 by hot pressing, and a connecting block 26 is arranged between the membrane ring 25 and the holding block 24. When the microporous filter component 16 needs to be replaced and installed, the user only needs to hold the holding block 24 by a hand of the user, and then the installation and the taking-out of the microporous filter component 16 are controlled.

Further, the electric push rod 3 can be a servo motor type electric push rod or an electric push rod with a coding motor, and the electric push rod can enable the free end to stretch and contract for a fixed distance so as to better eject the sealing element 9, thereby adjusting the pressure in the solution suction and discharge chamber 8. This is prior art and will not be described in detail herein.

Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. An injector for trace substance analysis, comprising an injection device (1) and a filter (2), characterized in that: the injection device (1) comprises an electric push rod (3), a fixing block (4) used for installing the electric push rod (3), an injection cavity (5) and an absorption injection joint (6), wherein the electric push rod (3), the fixing block (4), the injection cavity (5) and the absorption injection joint (6) are sequentially arranged from top to bottom, one side of the fixing block (4) is provided with a storage hole (7) used for accommodating the electric push rod (3), a solution absorption and discharge cavity (8) is arranged in the injection cavity (5), a sealing element (9) used for separating the storage hole (7) and the solution absorption and discharge cavity (8) is arranged between the fixing block (4) and the injection cavity (5), a spring (10) is arranged in the solution absorption and discharge cavity (8), one end of the spring (10) is fixed at the bottom of the solution absorption and discharge cavity (8), the other end of the spring (10) is abutted against the sealing element (9), one side of the absorption injection joint (6, the free end of the electric push rod (3) extends into the object placing hole (7) to exert pressure on the sealing element (9) so that the space size of the solution suction and discharge chamber (8) changes to change the pressure in the solution suction and discharge chamber (8), one side of the suction and injection joint (6) is in plug-in fit with the filter (2), one side of the filter (2) far away from the suction and injection joint (6) is provided with a suction and injection liquid port (12), one end of the filter (2) far away from the injection device (1) is provided with a drainage tube (13) matched with the suction and injection liquid port (12), openings at two ends of the drainage tube (13) are of a structure with a large upper part and a small lower part, and the cross section of one side of the drainage tube (13) matched with the lining tube is smaller than that of one side of the suction and injection liquid port (12) matched with the.

2. The injector for trace species analysis according to claim 1, wherein: the sealing element (9) is made of rubber material.

3. The injector for trace species analysis according to claim 1, wherein: the filter (2) comprises a shell (14), a communicating cavity (15) which can be communicated with the suction and injection joint (6) is arranged in the shell (14), a microporous filtering component (16) is detachably connected to one side of the shell (14), and a abdicating groove (18) which can be matched with the microporous filtering component (16) is also arranged on one side of the shell (14); when microporous filter component (16) insert in the groove of stepping down (18), microporous filter component (16) are arranged in intercommunication chamber (15) and with inhale notes and connect (6) and cooperate, one side of casing (14) is provided with can with inhale notes and connect (6) grafting complex connector (17).

4. The injector for trace species analysis according to claim 3, wherein: microporous filter subassembly (16) including with inhale annotate joint (6) matched with millipore filtration membrane (19) to and last filtering membrane support (20), lower filtering membrane support (21) of mutually supporting, go up filtering membrane support (20) and lower filtering membrane support (21) and all be the circle body form to be equipped with in the middle part of circle body and be used for seting off grid (22) of millipore filtration membrane (19), millipore filtration membrane (19) are a slice body, arrange in go up between filtering membrane support (20) and lower filtering membrane support (21) and with grid (22) position phase-match.

5. The injector for trace species analysis according to claim 4, wherein: the filter (2) further comprises a cartridge (23) used for installing the microporous filter component (16), the cartridge (23) comprises a holding block (24) protruding out of the shell (14) and allowing a human body to hold the holding block, and a membrane ring (25) located in the communicating cavity (15), the microporous filter component (16) is arranged in the membrane ring (25) and fixed with the membrane ring (25) in a hot-pressing mode, and a connecting block (26) is arranged between the membrane ring (25) and the holding block (24).

6. The injector for trace species analysis according to claim 1, wherein: the electric push rod (3) adopts a servo motor type electric push rod or an electric push rod with a coding motor.