阅读说明：本技术 一种样品定量检测气相色谱仪 (Gas chromatograph for quantitative detection of sample ) 是由 李泽斌 巫从安 邵婉宁 于 2020-12-31 设计创作，主要内容包括：本发明涉及气象色谱仪技术领域,且公开了一种样品定量检测气相色谱仪,包括气相色谱仪本体,所述气相色谱仪本体的顶部安装有进样管,所述进样管内安装有玻璃衬管,所述进样管的顶部螺纹连接有隔垫管,所述隔垫管与所述进样管相连通,所述隔垫管的内腔嵌入有进样隔垫,该样品定量检测气相色谱仪,降低了进样针进样时针管与进样隔垫之间的摩擦,避免针管弯曲,降低进样针刺破进样隔垫的概率,同时还能保证进进样针取出时样隔垫的密封性,提高进样隔垫的使用寿命。(The invention relates to the technical field of gas chromatographs, and discloses a gas chromatograph for quantitatively detecting samples, which comprises a gas chromatograph body, wherein a sample inlet pipe is installed at the top of the gas chromatograph body, a glass liner pipe is installed in the sample inlet pipe, the top of the sample inlet pipe is in threaded connection with a spacer pipe, the spacer pipe is communicated with the sample inlet pipe, and a sample inlet spacer is embedded in the inner cavity of the spacer pipe.)

1. The utility model provides a sample quantitative determination gas chromatograph, includes gas chromatograph body (1), advance appearance pipe (2) are installed at the top of gas chromatograph body (1), advance and install glass bushing pipe (21), its characterized in that in appearance pipe (2): the top of the sample inlet pipe (2) is in threaded connection with a spacer pipe (3), the spacer pipe (3) is communicated with the sample inlet pipe (2), a sample inlet spacer (31) is embedded into the inner cavity of the spacer pipe (3), the sample inlet spacer (31) is of a circular truncated cone-shaped structure, the diameter of the upper bottom of the sample inlet spacer (31) is larger than that of the lower bottom of the sample inlet spacer, a gap is formed in the middle of the sample inlet spacer (31), and the bottom of the inner cavity of the spacer pipe (3) is matched with the sample inlet spacer (31);

the top of the isolation cushion pipe (3) is in threaded connection with a pressure applying fixing piece (4), the middle part of the pressure applying fixing piece (4) is provided with a cylindrical sample inlet hole (41), the sampling hole (41) is communicated with the isolation cushion tube (3), two openings of the sampling hole (41) are respectively positioned on the upper end surface and the lower end surface of the pressure applying fixing piece (4), the bottom of the pressure applying fixing piece (4) is also provided with a cylindrical groove (42), a movable pressure applying cylinder (43) is movably sleeved in the cylindrical groove (42), the movable pressing cylinder (43) is a cylindrical tubular structure, one end of the movable pressing cylinder (43) positioned in the cylindrical groove (42) is abutted against the pressing fixing piece (4) through a pressing mechanism, one end of the movable pressure cylinder (43) positioned outside the cylinder-shaped groove (42) is abutted against the sample injection spacer (31).

2. The gas chromatograph for quantitative sample detection according to claim 1, wherein: a rotary groove (44) is formed in the pressing fixing piece (4), the rotary groove (44) comprises a first straight groove (441), a second straight groove (442) and a semi-circular groove (443), two ends of the semi-circular groove (443) are respectively communicated with the first straight groove (441) and the second straight groove (442), the first straight groove (441) is positioned at the top of the cylindrical groove (42) and communicated with the cylindrical groove (42), the second straight groove (442) is parallel to the first straight groove (441), and an opening at the bottom of the second straight groove (442) is positioned on the lower end face of the pressing fixing piece (4);

the pressure applying mechanism includes:

one end of the first transmission rod (51) is inserted into the first straight groove (441), and the other end of the first transmission rod (51) is abutted to the movable pressing barrel (43);

the second transmission rod (52) is slidably mounted in the second straight groove (442), a fixing screw (53) is connected to an opening at the bottom of the second straight groove (442) in a threaded manner, a pressure spring (54) is slidably mounted in the second straight groove (442), one end of the pressure spring (54) abuts against the second transmission rod (52), and the other end of the pressure spring (54) abuts against the fixing screw (53);

a transmission ball (55), wherein the transmission ball (55) is arranged in the rotary groove (44) in a rolling way, and the transmission ball (55) is positioned between the first transmission rod (51) and the second transmission rod (52);

the pressing fixing piece (4) is characterized in that a communicating groove (45) is further formed in the pressing fixing piece (4), one side of the communicating groove (45) is communicated with the second straight groove (442), the other side of the communicating groove (45) is communicated with the sample inlet hole (41), a driving rod (5) is further fixed on the second driving rod (52), and one end of the driving rod (5) penetrates through the communicating groove (45) and extends into the sample inlet hole (41).

3. The gas chromatograph for quantitative sample detection according to claim 2, wherein: an adjusting groove (46) is further formed in the pressing fixing piece (4), one end of the adjusting groove (46) is located on the upper end face of the pressing fixing piece (4), and the other end of the adjusting groove (46) is communicated with the semicircular groove (443);

wherein, it has adjusting screw (6) to go back threaded connection in adjusting groove (46), the bottom of adjusting screw (6) is the hemisphere, the hemisphere bottom terminal surface of adjusting screw (6) with the wall of half-round groove inner chamber is located same curved surface, is used for avoiding transmission ball (55) imbeds in adjusting groove (46).

4. The gas chromatograph for quantitative sample detection according to claim 3, wherein: and a pressure applying ring (7) is fixed at the bottom of the movable pressure applying cylinder (43) and is used for abutting against the sample injection spacer (31).

5. The gas chromatograph for quantitative sample detection according to claim 4, wherein: the slidable cover is equipped with first guide spare (8) of dredging in advance hole (41), the bottom of first guide spare (8) of dredging is contradicted on actuating lever (5), conical first guide hole (81) of dredging is seted up at first guide spare (8) middle part, avoids needle tubing (11) to contradict on actuating lever (5).

6. The gas chromatograph for quantitative sample detection according to claim 5, wherein: the guide piece (9) is dredged to the second fixed mounting in the annular ring of pressure applying ring (7), conical second is dredged and is offered guide hole (91) in the middle part of guide piece (9) is dredged to the second for dredge needle tubing (11) insert the accuracy and insert in the space of advance kind dottle pin (31).

Technical Field

The invention relates to the technical field of a gas chromatograph, in particular to a gas chromatograph for quantitatively detecting a sample.

Background

The gas chromatograph is an instrument for qualitatively and quantitatively analyzing a multi-component complex mixture by utilizing a chromatographic separation technology and a detection technology; gas chromatographs are commonly used to analyze thermally stable organic materials in soils with boiling points not exceeding 500 ℃, such as volatile organic materials, organochlorines, organophosphates, polycyclic aromatic hydrocarbons, phthalate esters, and the like.

When an existing gas chromatograph analyzes and detects organic matters, a sample is generally required to be prepared into a sample reagent, a sample injection needle is used for absorbing a quantitative reagent and is inserted into a sample injection port at the top of the gas chromatograph, so that a needle tube part of the sample injection needle extends into a glass liner tube from a gap in the middle of a sample injection spacer, and finally the reagent is injected into the glass liner tube and the sample injection needle is pulled out from the sample injection port.

The sample introduction spacer is generally made of silicon rubber with high temperature resistance and good air tightness, and on one hand, the sample introduction spacer has the function of keeping a gas chromatograph system in a sealed state, namely, separating a sample flow path from the outside so as to prevent air from entering the system or preventing the sample from leaking; on the other hand, the pressure inside the chromatographic system is kept stable, and in order to enable the sampling isolation pad to realize the functions, the existing sampling isolation pad is always in a pressed state when being positioned in a sampling port, and the sampling isolation pad is pressed to deform, so that a gap in the middle of the sampling isolation pad is in a closed state under the condition that no needle tube enters, and the sealing effect of the sampling isolation pad is ensured; on the other hand, also can receive considerable resistance when the needle tubing pierces into the space for the needle tubing takes place to buckle easily, and the friction increase of needle tubing and appearance shock insulator can increase the wearing and tearing of appearance shock insulator simultaneously, further causes adverse effect to the leakproofness and the life of appearance shock insulator.

Disclosure of Invention

The invention provides a gas chromatograph for quantitatively detecting a sample, which reduces the friction between a needle tube and a sampling spacer when a sampling needle samples, reduces the probability that the sampling needle pierces the sampling spacer, simultaneously can ensure the sealing performance of the sampling spacer, improves the service life of the sampling spacer, and solves the problems that the prior sampling spacer in the background technology is always in a pressed state when being positioned in a sample inlet, and the sampling spacer is pressed and deformed, so that a gap in the middle of the sampling spacer is in a closed state under the condition that no needle tube enters, so as to ensure the sealing effect of the sampling spacer; on the other hand, also can receive considerable resistance when the needle tubing pierces into the space for the needle tubing takes place to buckle easily, and the friction increase of needle tubing and appearance shock insulator can increase the wearing and tearing of appearance shock insulator simultaneously, further causes adverse effect's problem to the leakproofness and the life of appearance shock insulator.

The invention provides the following technical scheme: a gas chromatograph for quantitatively detecting samples comprises a gas chromatograph body, wherein a sample inlet pipe is installed at the top of the gas chromatograph body, a glass liner pipe is installed in the sample inlet pipe, the top of the sample inlet pipe is in threaded connection with a spacer pipe, the spacer pipe is communicated with the sample inlet pipe, a sample inlet spacer is embedded in the inner cavity of the spacer pipe, the sample inlet spacer is of a circular truncated cone-shaped structure, the diameter of the upper bottom of the sample inlet spacer is larger than that of the lower bottom of the sample inlet spacer, a gap is formed in the middle of the sample inlet spacer, and the bottom of the inner cavity of the spacer pipe is matched with the sample inlet spacer; the top threaded connection of spacer pipe has the mounting of exerting pressure, columniform inlet hole has been seted up at the middle part of the mounting of exerting pressure, the inlet hole with the spacer pipe is linked together, two openings in inlet hole are located respectively two upper and lower terminal surfaces of the mounting of exerting pressure, the cylindrical groove has still been seted up to the bottom of the mounting of exerting pressure, the mobilizable cover in inside in cylindrical groove is equipped with the activity and exerts a pressure section of thick bamboo, the activity is exerted a pressure section of thick bamboo and is cylindrical tubular structure, the activity is exerted a pressure section of thick bamboo and is located the one end of cylindrical inslot portion through pressing mechanism with the mounting of exerting pressure forms the conflict, the activity is exerted a pressure the section of thick bamboo and is located the one end of cylindrical ins.

As an alternative to the quantitative determination of a gas chromatograph for samples according to the present invention, wherein: a rotary groove is formed in the pressing fixing piece and comprises a first straight groove, a second straight groove and a semicircular groove, two ends of the semicircular groove are respectively communicated with the first straight groove and the second straight groove, the first straight groove is positioned at the top of the cylindrical groove and is communicated with the cylindrical groove, the second straight groove is parallel to the first straight groove, and an opening at the bottom of the second straight groove is positioned on the lower end face of the pressing fixing piece;

the pressure applying mechanism includes:

one end of the first transmission rod is inserted into the first straight groove, and the other end of the first transmission rod is abutted to the movable pressing barrel;

the second transmission rod is slidably arranged in the second straight groove, an opening at the bottom of the second straight groove is in threaded connection with a fixing screw, a pressure spring is also slidably arranged in the second straight groove, one end of the pressure spring abuts against the second transmission rod, and the other end of the pressure spring abuts against the fixing screw;

the transmission ball is arranged in the rotary groove in a rolling manner and is positioned between the first transmission rod and the second transmission rod;

the pressing fixing piece is arranged on the base, the pressing fixing piece is arranged on the pressing fixing piece, a communicating groove is formed in the pressing fixing piece, one side of the communicating groove is communicated with the second straight groove, the other side of the communicating groove is communicated with the sample inlet hole, a driving rod is further fixed on the second driving rod, and one end of the driving rod penetrates through the communicating groove and extends into the sample inlet hole.

As an alternative to the quantitative determination of a gas chromatograph for samples according to the present invention, wherein: an adjusting groove is further formed in the pressure applying fixing piece, one end of the adjusting groove is located on the upper end face of the pressure applying fixing piece, and the other end of the adjusting groove is communicated with the semicircular groove; the inner side of the adjusting groove is provided with a semi-spherical inner cavity, the inner side of the semi-spherical inner cavity is provided with a plurality of semi-circular grooves, and the inner side of each semi-circular groove is provided with a plurality of adjusting screws.

As an alternative to the quantitative determination of a gas chromatograph for samples according to the present invention, wherein: and a pressure applying ring is fixed at the bottom of the movable pressure applying cylinder and is used for abutting against the sample injection spacer.

As an alternative to the quantitative determination of a gas chromatograph for samples according to the present invention, wherein: the slidable cover in the inlet opening is equipped with first guide piece of dredging, the bottom of first guide piece of dredging is contradicted on the actuating lever, first guide piece middle part of dredging is seted up conical first guide hole of dredging, avoids the needle tubing to contradict on the actuating lever.

As an alternative to the quantitative determination of a gas chromatograph for samples according to the present invention, wherein: the annular hole of the pressure applying ring is internally and fixedly provided with a second dredging part, the middle part of the second dredging part is provided with a conical second dredging hole for dredging the needle tube to be inserted into the gap of the sample injection spacer accurately.

The invention has the following beneficial effects:

1. this sample quantitative determination gas chromatograph has reduced the friction between needle tubing and the advance kind spacer when the injection needle advances a kind, avoids the needle tubing crooked, reduces the probability that the injection needle punctures the advance kind spacer, can also guarantee simultaneously to advance the leakproofness of the sample spacer when the injection needle takes out, improves the life of advancing the kind spacer.

2. The sample quantitative detection gas chromatograph has the advantages that the needle tube part of the sample injection needle moves downwards to drive the driving rod to move downwards again to be communicated with the groove, the second transmission rod moves downwards to compress the pressure spring, the transmission ball is not extruded by the second transmission rod any more at the moment, the pressure on the first transmission rod is also cancelled by the transmission ball, the movable pressure cylinder is not pressed by the first transmission rod at the moment, the sample injection spacer is not pressed, and the gap in the sample injection spacer is not pressed, so that the needle tube part of the sample injection needle penetrates through the gap of the sample injection spacer, the needle tube is prevented from puncturing the sample injection spacer, the friction force between the needle tube and the sample injection spacer is reduced, the needle tube is prevented from being stressed and bent, the practical service life of the sample injection spacer and the service life of the needle tube are prolonged, then a reagent in the sample injection needle is injected into the glass lining tube, the sample injection needle is taken out, and the driving rod is not pressed by, the pressure spring applies pressure to the second transmission rod again, the pressure is applied to the first transmission rod and the movable pressure applying cylinder in a turning mode through the transmission ball, the movable pressure applying cylinder moves downwards in the cylindrical groove, and finally the pressure is applied to the sample introduction isolation pad, the sample introduction isolation pad is generally made of high-temperature-resistant silicon rubber with good air tightness, and the movable pressure applying cylinder extrudes the sample introduction isolation pad, so that the sample introduction isolation pad is deformed in a pressed mode, gaps are enabled to be sealed, and the reagent in the glass lining pipe is prevented from leaking.

3. This gas chromatograph for quantitative sample detection, people can change the compression that exerts pressure spring all through adjusting the groove and injecting the transmission ball or taking out the transmission ball of half slot in to the half slot to adjust the pressure that advances the kind spacer and receive.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

FIG. 2 is a schematic view of the pressure applying fixture and its internal components according to the present invention.

Fig. 3 is a schematic perspective view of the pressing fixture according to the present invention.

Fig. 4 is a sectional view of fig. 3 according to the present invention.

In the figure: 1. the gas chromatograph comprises a gas chromatograph body, 2, a sample inlet pipe, 21, a glass liner pipe, 3, a spacer pipe, 31, a sample inlet spacer, 311, a cavity, 4, a pressing fixing piece, 41, a sample inlet hole, 42, a cylindrical groove, 43, a movable pressing cylinder, 44, a rotary groove, 441, a first straight groove, 442, a second straight groove, 443, a semicircular groove, 45, a communication groove, 46, an adjusting groove, 5, a driving rod, 51, a first driving rod, 52, a second driving rod, 53, a fixing screw, 54, a pressing spring, 55, a driving ball, 6, an adjusting screw, 7, a pressing ring, 8, a first dredging part, 81, a first dredging hole, 9, a second dredging part, 91, a second dredging hole, 10, a sample inlet needle, 11 and a needle tube.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Referring to fig. 1-4, a gas chromatograph for quantitative sample detection comprises a gas chromatograph body 1, wherein a sample inlet pipe 2 is mounted at the top of the gas chromatograph body 1, a glass liner pipe 21 is mounted in the sample inlet pipe 2, a spacer pipe 3 is connected to the top of the sample inlet pipe 2 in a threaded manner, the spacer pipe 3 is communicated with the sample inlet pipe 2, a sample inlet spacer 31 is embedded in the inner cavity of the spacer pipe 3, the sample inlet spacer 31 is of a circular truncated cone-shaped structure, the diameter of the upper bottom of the sample inlet spacer 31 is larger than that of the lower bottom of the sample inlet spacer 31, a gap is formed in the middle of the sample inlet spacer 31, and the bottom of the inner cavity of the spacer pipe 3 is matched with the sample inlet; the top threaded connection of spacer pipe 3 has the mounting 4 of exerting pressure, columniform inlet hole 41 has been seted up at the middle part of the mounting 4 of exerting pressure, inlet hole 41 is linked together with spacer pipe 3, two openings of inlet hole 41 are located two upper and lower terminal surfaces of the mounting 4 of exerting pressure respectively, cylindrical groove 42 has still been seted up to the bottom of the mounting 4 of exerting pressure, the mobilizable cover in inside in cylindrical groove 42 is equipped with the activity and exerts pressure a section of thick bamboo 43, the activity is exerted pressure a section of thick bamboo 43 and is cylindrical tubular structure, the activity is exerted pressure a section of thick bamboo 43 and is located the inside one end in cylindrical groove 42 and pass through the mechanism of exerting pressure and form conflict with the mounting 4 of exerting pressure, the activity is exerted pressure a section.

The working principle is specifically explained as follows: when the quantitative detection and analysis of the reagent is performed, firstly, a proper amount of reagent is taken through the sampling needle 10, then the needle head part of the sampling needle 10 is inserted into the sampling hole 41, at this time, the sampling needle 10 touches the pressure mechanism, so that the pressure mechanism reduces the pressure generated by the movable pressure barrel 43, thereby reducing the pressure generated by the movable pressure barrel 43 on the sampling spacer 31, at this time, the gap in the sampling spacer 31 is not pressed, thereby facilitating the penetration of the needle tube 11 part of the sampling needle 10 through the gap of the sampling spacer 31, avoiding the needle tube 11 from puncturing the sampling spacer 31, simultaneously reducing the friction force between the needle tube 11 and the sampling spacer 31, avoiding the bending of the needle tube 11 due to the stress, being beneficial to prolonging the practical service life of the sampling spacer 31, then, the reagent in the sampling needle 10 is injected into the glass liner tube 21, the sampling needle 10 is taken out, because the pressure mechanism is not collided by the sampling needle 10, at this time, the pressure mechanism recovers the pressure effect on the movable pressure barrel 43, the sample introduction isolation pad 31 is generally made of silicon rubber with high temperature resistance and good air tightness, and the movable pressure applying cylinder 43 extrudes the sample introduction isolation pad 31, so that the sample introduction isolation pad 31 is pressed and deformed, gaps are enabled to be sealed, and the reagent in the glass liner tube 21 is prevented from leaking.

The inside of the pressing fixing member 4 is provided with a rotary groove 44, the rotary groove 44 includes a first straight groove 441, a second straight groove 442 and a semi-circular groove 443, two ends of the semi-circular groove 443 are respectively communicated with the first straight groove 441 and the second straight groove 442, the first straight groove 441 is positioned at the top of the cylindrical groove 42 and is communicated with the cylindrical groove 42, the second straight groove 442 is parallel to the first straight groove 441, and an opening at the bottom of the second straight groove 442 is positioned at the lower end surface of the pressing fixing member 4, specifically, as shown in fig. 2 or fig. 4, the rotary groove 44 can be roughly regarded as an inverted U-shaped groove structure.

The pressure applying mechanism includes:

one end of the first transmission rod 51 is inserted into the first straight groove 441, and the other end of the first transmission rod 51 is abutted to the movable pressing cylinder 43; the second transmission rod 52 is slidably installed in the second straight groove 442, a fixing screw 53 is connected to an opening at the bottom of the second straight groove 442 in a threaded manner, a pressure spring 54 is also slidably installed in the second straight groove 442, one end of the pressure spring 54 abuts against the second transmission rod 52, and the other end of the pressure spring 54 abuts against the fixing screw 53; the transmission ball 55, the transmission ball 55 can be installed in the rotary groove 44 rollably, the transmission ball 55 locates between first transmission rod 51 and second transmission rod 52; the inside of the pressing fixing member 4 is further provided with a communicating groove 45, one side of the communicating groove 45 is communicated with the second straight groove 442, the other side of the communicating groove 45 is communicated with the sample injection hole 41, the second transmission rod 52 is further fixed with a driving rod 5, and one end of the driving rod 5 penetrates through the communicating groove 45 and extends into the sample injection hole 41.

The specific working principle is that when the reagent is quantitatively detected and analyzed, firstly, a proper amount of reagent is taken through the sampling needle 10, then the needle head part of the sampling needle 10 is inserted into the sampling hole 41, at this time, the needle tube 11 part of the sampling needle 10 moving downwards drives the driving rod 5 to move downwards again in the communicating groove 45, the second transmission rod 52 also moves downwards and compresses the pressing spring 54, at this time, the transmission ball 55 is not pressed by the second transmission rod 52 any more, so the transmission ball 55 cancels the pressure to the first transmission rod 51, at this time, the movable pressing cylinder 43 is not pressed by the first transmission rod 51, the sampling isolation pad 31 is not pressed, the gap in the sampling isolation pad 31 is not pressed, thereby the needle tube 11 part of the sampling needle 10 penetrates through the gap of the sampling isolation pad 31, the needle tube 11 is prevented from puncturing the sampling isolation pad 31, and the friction force between the needle tube 11 and the sampling isolation pad 31 is reduced, avoid the needle tubing 11 to be stressed and bent, be favorable to prolonging the practical life of the sample introduction spacer 31, and the life of the needle tubing 11, later inject the reagent in the sample introduction needle 10 into the glass liner tube 21, take out the sample introduction needle 10, at this moment, the driving rod 5 is because not being stressed by the sample introduction needle 10, the pressure spring 54 exerts pressure to the second driving lever 52 again, this pressure is exerted to the first driving rod 51 and the movable pressure cylinder 43 through the diversion of the transmission ball 55, the movable pressure cylinder 43 moves downwards in the cylinder-shaped groove 42 again, finally exert pressure to the sample introduction spacer 31, the sample introduction spacer 31 is generally made of silicon rubber with high temperature resistance and good air tightness, the movable pressure cylinder 43 forms the extrusion to the sample introduction spacer 31, thereby make the sample introduction spacer 31 pressed and deformed and impel the space to receive the sealing, avoid the reagent in the glass liner tube 21 to leak outward.

An adjusting groove 46 is further formed in the pressing fixing member 4, one end of the adjusting groove 46 is located on the upper end face of the pressing fixing member 4, and the other end of the adjusting groove 46 is communicated with the semicircular groove 443; wherein, the threaded connection has adjusting screw 6 in the adjustment tank 46 still, and the bottom of adjusting screw 6 is the hemisphere, and the hemisphere bottom terminal surface of adjusting screw 6 is located same curved surface with the wall of half-round groove inner chamber for avoid transmission ball 55 to imbed in the adjustment tank 46.

When the pressure applied to the sampling spacer 31 needs to be changed, that is, the compression degree of the pressure spring 54 is changed, one can adjust the pressure applied to the sampling spacer 31 by injecting the transmission ball 55 into the semicircular groove 443 or taking out the transmission ball 55 in the semicircular groove 443 through the adjustment groove 46 to change the compression degree of the pressure spring 54.

The bottom of the movable pressure applying cylinder 43 is fixed with a pressure applying ring 7 for abutting against the sampling spacer 31, and the pressure applying ring 7 is used for increasing the contact area between the movable pressure applying cylinder 43 and the sampling spacer 31, so that the deformation of the whole sampling spacer 31 is facilitated, and the phenomenon that the gap cannot be sealed due to the local deformation of the sampling spacer 31 is avoided.

The first guide piece 8 is slidably sleeved in the sampling hole 41, the bottom of the first guide piece 8 props against the driving rod 5, and the first guide hole 81 is formed in the middle of the first guide piece 8 to prevent the needle tube 11 from propping against the driving rod 5.

A second dredging component 9 is fixedly arranged in the ring hole of the pressure applying ring 7, and a second conical dredging hole 91 is formed in the middle of the second dredging component 9 and used for dredging the needle tube 11 and inserting into the gap of the sample introduction spacer 31 accurately.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.