阅读说明：本技术 一种多用途的离子色谱仪的进样嘴 (Multipurpose sample injection nozzle of ion chromatograph ) 是由 阳诚贵 冯小杰 于 2021-08-06 设计创作，主要内容包括：本发明公开了一种多用途的离子色谱仪的进样嘴,其包括：负压盘,所述负压盘内设置有分隔墙,所述分隔墙将所述负压盘分隔为两部分,并均设置有进液孔,所述负压盘底部设置有固定槽；密封盖,所述密封盖密封固定安装在所述负压盘上；电机,所述电机固定安装在所述固定槽上；连接件,所述转轴穿过所述连接件并与所述连接件固定连接；轴套,所述轴套固定安装在所述转轴上；支架,所述支架固定安装在所述连接件上,所述支架内设置有针管套；压座,所述压座固定安装在所述支架的上侧；针管,所述针管安装在所述针管套上；以及其他部件和对应的使用方法,实现了方便地抽取样品溶液和适用多种使用场合,同时便于清洗、拆卸。(The invention discloses a sample injection nozzle of a multipurpose ion chromatograph, which comprises: the negative pressure plate is internally provided with a partition wall, the partition wall divides the negative pressure plate into two parts, liquid inlet holes are formed in the partition wall, and a fixing groove is formed in the bottom of the negative pressure plate; the sealing cover is fixedly arranged on the negative pressure plate in a sealing manner; the motor is fixedly arranged on the fixing groove; the rotating shaft penetrates through the connecting piece and is fixedly connected with the connecting piece; the shaft sleeve is fixedly arranged on the rotating shaft; the bracket is fixedly arranged on the connecting piece, and a needle tube sleeve is arranged in the bracket; the pressing seat is fixedly arranged on the upper side of the bracket; a needle cannula mounted on the needle cannula sleeve; and other parts and corresponding using methods, the sample solution can be conveniently extracted, the device is suitable for various using occasions, and the device is convenient to clean and disassemble.)

1. A kind introduction nozzle of ion chromatograph of multipurpose, characterized by that, includes: the negative pressure plate is internally provided with a partition wall, the partition wall divides the negative pressure plate into a first negative pressure chamber and a second negative pressure chamber, the first negative pressure chamber and the second negative pressure chamber are respectively provided with a liquid inlet hole, and the bottom of the negative pressure plate is provided with a fixed groove;

the sealing cover is provided with a first liquid pumping nozzle and a second liquid pumping nozzle, the first liquid pumping nozzle and the second liquid pumping nozzle respectively correspond to the first negative pressure chamber and the second negative pressure chamber, and the sealing cover is fixedly arranged on the negative pressure plate in a sealing manner;

the connecting sleeve is fixedly arranged on the liquid inlet hole and is internally provided with a sealing ring;

the sealing plug is arranged on the connecting sleeve and plays a role in sealing when the first negative pressure chamber or the second negative pressure chamber is not used;

the motor is fixedly arranged on the fixing groove, and a rotating shaft of the motor extends towards the lower side;

the rotating shaft penetrates through the connecting piece and is fixedly connected with the connecting piece;

the shaft sleeve is fixedly arranged on the rotating shaft, the shaft sleeve is positioned on the lower side of the connecting piece, and auxiliary equipment is arranged on the shaft sleeve and used for assisting sampling;

the bracket is fixedly arranged on the connecting piece, and a needle tube sleeve is arranged in the bracket;

the needle tube support comprises a needle tube, a needle tube sleeve and a pressing seat, wherein the pressing seat is provided with a matching through groove matched with the needle tube sleeve, the upper surface of the matching through groove is provided with a matching flange, the side wall of the matching flange is provided with a plurality of locking holes, locking screws are installed on the locking holes, and the pressing seat is fixedly installed on the upper side of the support;

the side wall of the upper end part of the needle tube is provided with a ring groove, the ring groove is matched with the locking hole, the needle tube is arranged on the needle tube sleeve, the upper end part of the needle tube is hermetically connected with the connecting sleeve, and the needle tube is fixed by the locking screw;

the motor and the auxiliary equipment are electrically connected with the main control board, and the main control board is fixedly installed on the bottom surface of the negative pressure plate;

and a method of use comprising the steps of:

s010, according to the property of the sampling solution and the using condition of the eluent, the user selects to start or not start the auxiliary equipment;

s020, starting an ion chromatograph body, wherein a first set of detection pipelines of the ion chromatograph body extract a sample through a needle tube;

s030, after sampling is finished, stopping the extraction of the first set of pipelines by the ion chromatograph body, and preparing to start to extract a second sample;

s031, after stopping sampling, drive the said needle tubing to leave the liquid level and stand for a certain time;

s040, the needle tube is detached, the connecting sleeve corresponding to the needle tube is plugged by the sealing plug, and the sealing plug is taken down from the other connecting sleeve;

s041, the taken-down needle tube is cleaned, the main control panel drives the motor to rotate, and the motor drives the bracket to align to the other connecting sleeve where sampling is not performed;

s050, the cleaned needle tube is arranged on the needle tube sleeve and inserted into the connecting sleeve;

step S060, starting the ion chromatograph body, wherein a second set of detection pipelines of the ion chromatograph body extracts a second sample through the needle tube;

and S070, after sampling of the second sample is completed, detaching the negative pressure plate and the needle tube for cleaning, and recovering after cleaning.

2. The multipurpose sample injection nozzle of the ion chromatograph of claim 1, wherein the upper end surface of the negative pressure plate is provided with a connecting part, and the connecting part is used for fixedly connecting the ion chromatograph body or an external support.

3. The multipurpose sample injection nozzle of an ion chromatograph of claim 1, wherein the negative pressure plate is provided with a mounting protrusion, the mounting protrusion is located on the partition wall, and the position of the fixing groove corresponds to the position of the mounting protrusion.

4. The multi-purpose sample injection nozzle of ion chromatograph of claim 1, wherein the auxiliary equipment is any one or more of electrochemical detector, PH module, conductivity module, and ultrasonic generator.

5. The multipurpose sample injection nozzle of an ion chromatograph according to claim 1, wherein a clamping groove is formed in any one side or two sides of the support, an auxiliary support is mounted on the clamping groove, a plurality of mounting grooves are formed in the auxiliary support, and the mounting grooves are used for mounting sensors.

6. The multi-purpose sample injection nozzle of an ion chromatograph of claim 5, wherein a bracket is disposed on a side surface of the auxiliary support, an auxiliary circuit board is disposed on the bracket, the auxiliary circuit board is used to electrically connect the sensor and the main control board, and the main control board sets an initial level and a reset of the sensor through the auxiliary circuit board.

7. The multi-purpose sample injection nozzle of ion chromatograph of claim 1, wherein the outer sidewall of the lower end of the needle tube is provided with a side groove, and the side groove is provided with a metal sheet for promoting the sample solution to perform chemical reaction or promoting the sample solution in unstable chemical state to decompose spontaneously.

8. The multi-purpose ion chromatograph sampling nozzle of claim 7, wherein the side slots are provided in at least two.

9. The multi-purpose sample injection nozzle of ion chromatograph of claim 8, wherein at least one of said side slots is fixedly installed with a test strip for detecting the current chemical property of the sample solution or detecting impurities.

Technical Field

The invention relates to the technical field of ion chromatographs, in particular to a multipurpose sample injection nozzle of an ion chromatograph.

Background

Ion Chromatography (IC) is a method for continuously separating, qualitatively and quantitatively determining various anions or cations coexisting by using the principle of ion exchange. The principle of separation is based on the reversible exchange between dissociable ions on an ion exchange resin and solute ions of the same charge in the mobile phase and the difference in affinity of the analyte solute for the exchanger, and is applicable to the separation of hydrophilic anions and cations.

The ion chromatograph is mainly used for analyzing environmental samples based on ion chromatography, including anions and cations in samples such as surface water, drinking water, rainwater, domestic sewage, industrial wastewater, acid sediment, atmospheric particulate matters and the like, and trace impurities in water and reagents related to the microelectronic industry.

In industrial production and educational scientific research, samples and products are often required to be analyzed, the purity of the samples and the products is checked or impurities are found, the samples and the products are generally required to be matched with a eluent for use in the detection process, and the existing chromatograph generally has only one or two sets of detection pipelines and needs to clean internal system components regularly. When one device extracts a plurality of samples with different chemical properties, in order to avoid accuracy reduction and sample cross contamination, the pipeline and the sample injection device are generally required to be cleaned, so that the detection efficiency is reduced. Meanwhile, the existing sample feeding equipment has wide application range, complicated use and cleaning steps and narrow application range.

Accordingly, there is a need for a multi-purpose sample injection nozzle for an ion chromatograph that addresses one or more of the above problems.

Disclosure of Invention

In order to solve one or more problems in the prior art, the invention provides a multipurpose sample injection nozzle of an ion chromatograph. The technical scheme adopted by the invention for solving the problems is as follows: a multi-purpose sample injection nozzle for an ion chromatograph, comprising: the negative pressure plate is internally provided with a partition wall, the partition wall divides the negative pressure plate into a first negative pressure chamber and a second negative pressure chamber, the first negative pressure chamber and the second negative pressure chamber are respectively provided with a liquid inlet hole, and the bottom of the negative pressure plate is provided with a fixed groove;

the sealing cover is provided with a first liquid pumping nozzle and a second liquid pumping nozzle, the first liquid pumping nozzle and the second liquid pumping nozzle respectively correspond to the first negative pressure chamber and the second negative pressure chamber, and the sealing cover is fixedly arranged on the negative pressure plate in a sealing manner;

the connecting sleeve is fixedly arranged on the liquid inlet hole and is internally provided with a sealing ring;

the sealing plug is arranged on the connecting sleeve and plays a role in sealing when the first negative pressure chamber or the second negative pressure chamber is not used;

the motor is fixedly arranged on the fixing groove, and a rotating shaft of the motor extends towards the lower side;

the rotating shaft penetrates through the connecting piece and is fixedly connected with the connecting piece;

the shaft sleeve is fixedly arranged on the rotating shaft, the shaft sleeve is positioned on the lower side of the connecting piece, and auxiliary equipment is arranged on the shaft sleeve and used for assisting sampling;

the bracket is fixedly arranged on the connecting piece, and a needle tube sleeve is arranged in the bracket;

the needle tube support comprises a needle tube, a needle tube sleeve and a pressing seat, wherein the pressing seat is provided with a matching through groove matched with the needle tube sleeve, the upper surface of the matching through groove is provided with a matching flange, the side wall of the matching flange is provided with a plurality of locking holes, locking screws are installed on the locking holes, and the pressing seat is fixedly installed on the upper side of the support;

the side wall of the upper end part of the needle tube is provided with a ring groove, the ring groove is matched with the locking hole, the needle tube is arranged on the needle tube sleeve, the upper end part of the needle tube is hermetically connected with the connecting sleeve, and the needle tube is fixed by the locking screw;

the motor and the auxiliary equipment are electrically connected with the main control board, and the main control board is fixedly installed on the bottom surface of the negative pressure plate;

and a method of use comprising the steps of:

s010, according to the property of the sampling solution and the using condition of the eluent, the user selects to start or not start the auxiliary equipment;

s020, starting an ion chromatograph body, wherein a first set of detection pipelines of the ion chromatograph body extract a sample through a needle tube;

s030, after sampling is finished, stopping the extraction of the first set of pipelines by the ion chromatograph body, and preparing to start to extract a second sample;

s031, after stopping sampling, drive the said needle tubing to leave the liquid level and stand for a certain time;

s040, the needle tube is detached, the connecting sleeve corresponding to the needle tube is plugged by the sealing plug, and the sealing plug is taken down from the other connecting sleeve;

s041, the taken-down needle tube is cleaned, the main control panel drives the motor to rotate, and the motor drives the bracket to align to the other connecting sleeve where sampling is not performed;

s050, the cleaned needle tube is arranged on the needle tube sleeve and inserted into the connecting sleeve;

step S060, starting the ion chromatograph body, wherein a second set of detection pipelines of the ion chromatograph body extracts a second sample through the needle tube;

and S070, after sampling of the second sample is completed, detaching the negative pressure plate and the needle tube for cleaning, and recovering after cleaning.

Further, the upper end face of negative pressure disk is provided with connecting portion, connecting portion are used for fixed connection ion chromatograph body or external support.

Furthermore, the negative pressure plate is provided with an installation bulge, the installation bulge is positioned on the partition wall, and the position of the fixing groove corresponds to the position of the installation bulge.

Further, the auxiliary equipment is any one or more of an electrochemical detector, a PH module, a conductivity module and an ultrasonic generator.

Further, arbitrary one side or both sides of support are provided with the draw-in groove, install the auxiliary stand on the draw-in groove, be provided with a plurality of mounting groove on the auxiliary stand, the mounting groove is used for installing the sensor.

Further, a bracket is arranged on the side face of the auxiliary support, an auxiliary circuit board is arranged on the bracket and used for electrically connecting the sensor and the main control board, and the main control board sets the initial level and the reset of the sensor through the auxiliary circuit board.

Furthermore, a side groove is formed in the outer side wall of the lower end portion of the needle tube, a metal sheet is installed on the side groove, and the metal sheet is used for promoting the sample solution to perform chemical reaction or promoting the sample solution in an unstable chemical state to decompose spontaneously.

Further, the side grooves are provided with at least two; and the side grooves are fixedly provided with detection test paper which is used for detecting the current chemical property of the sample solution or detecting impurities.

The invention has the following beneficial values: according to the invention, the negative pressure plate, the motor, the connecting piece, the bracket, the needle tube, the main control board and other components are connected together through ingenious structures and matched with corresponding use methods, so that the detection of different types of sample solutions on the ion chromatograph with multiple sets of detection pipelines is realized, the suction nozzle can be conveniently disassembled and cleaned, the suction nozzle does not need to be cleaned through the matching of cleaning equipment in the ion chromatograph, and the internal structure of the ion chromatograph is simplified; the device can be matched with auxiliary reaction equipment, substances, detection equipment and test paper for use, real-time detection in the sampling process is realized, errors and impurities in the sampling process are found in time, and the accuracy is improved. The needle tube is convenient to mount, dismount and clean, can be recycled for many times, and prolongs the service life of the needle nozzle; the negative pressure disk can absorb the sample solution of backward flow, reduces the risk of the internal pipeline or the port crystallization of ion chromatograph body, and the pulsation when can reducing the first time and draw simultaneously reduces the pressure of the internal pipeline of ion chromatograph body. The practical value of the invention is greatly improved.

Drawings

FIG. 1 is a perspective view of a sample injection nozzle of a multi-purpose ion chromatograph according to the present invention;

FIG. 2 is a side view of a sample injection nozzle of a multi-purpose ion chromatograph of the present invention;

FIG. 3 is a partial exploded view I of a sample inlet of a multi-purpose ion chromatograph according to the present invention;

FIG. 4 is a partial cross-sectional view of a sample injection nozzle of a multi-purpose ion chromatograph in accordance with the present invention;

FIG. 5 is a partial exploded view II of a sample inlet of a multi-purpose ion chromatograph according to the present invention;

FIG. 6 is a partial exploded view III of a sample inlet of a multi-purpose ion chromatograph according to the present invention;

FIG. 7 is a top view of a support for a sample injection nozzle of a multi-purpose ion chromatograph in accordance with the present invention;

FIG. 8 is a sectional view taken along the A-A direction of a top view of a support of a sample injection nozzle of the multipurpose ion chromatograph according to the present invention;

fig. 9 is a schematic block diagram of a method for using a sample injection nozzle holder of a multipurpose ion chromatograph according to the present invention.

[ reference numerals ]

101. negative pressure plate

102. dividing wall

103. liquid inlet hole

104. mounting projection

105. first negative pressure chamber

106. second negative pressure chamber

110. seal cover

111. first liquid suction nozzle

112. second liquid suction nozzle

113. connecting part

120. fixed groove

130. connecting sleeve

131. sealing ring

140. sealing plug

150. motor

151. rotating shaft

160. shaft sleeve

170 auxiliary equipment

201 support

202. needle tube sleeve

203. card slot

210. press seat

211. matching through groove

212. mating flanges

213. locking hole

214. locking screw

220. connecting piece

230. auxiliary support

231. mounting groove

232. bracket

240. sensor

301. needle tube

302. side groove

303. ring groove

304. chamfer

310. sheet metal

320. detection test paper

401. Main control board.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

As shown in fig. 1 to 8, the present invention discloses a multi-purpose sample injection nozzle of an ion chromatograph, which comprises: the negative pressure plate 101 is provided with a partition wall 102 inside, the partition wall 102 divides the negative pressure plate 101 into a first negative pressure chamber 105 and a second negative pressure chamber 106, liquid inlet holes 103 are formed in the first negative pressure chamber 105 and the second negative pressure chamber 106, and a fixing groove 120 is formed in the bottom of the negative pressure plate 101;

the sealing cover 110 is provided with a first liquid drawing nozzle 111 and a second liquid drawing nozzle 112, the first liquid drawing nozzle 111 and the second liquid drawing nozzle 112 respectively correspond to the first negative pressure chamber 105 and the second negative pressure chamber 106, and the sealing cover 110 is fixedly mounted on the negative pressure plate 101 in a sealing manner;

the connecting sleeve 130 is fixedly arranged on the liquid inlet hole 103, and a sealing ring 131 is arranged in the connecting sleeve 130;

a sealing plug 140, wherein the sealing plug 140 is mounted on the connecting sleeve 130, and plays a role of sealing when the first negative pressure chamber 105 or the second negative pressure chamber 106 is not used;

a motor 150, wherein the motor 150 is fixedly installed on the fixing groove 120, and a rotating shaft 151 of the motor 150 extends toward a lower side;

the connecting piece 220, the said spindle 151 crosses the said connecting piece 220 and fixedly connects with said connecting piece 220;

the shaft sleeve 160 is fixedly arranged on the rotating shaft 151, the shaft sleeve 160 is positioned at the lower side of the connecting piece 220, the shaft sleeve 160 is provided with an auxiliary device 170, and the auxiliary device 170 is used for assisting sampling;

the support 201 is fixedly arranged on the connecting piece 220, and a needle tube sleeve 202 is arranged in the support 201;

the pressing base 210 is provided with a matching through groove 211 matched with the needle cannula sleeve 202, the upper surface of the matching through groove 211 is provided with a matching flange 212, the side wall of the matching flange 212 is provided with a plurality of locking holes 213, the locking holes 213 are provided with locking screws 214, and the pressing base 210 is fixedly arranged on the upper side of the bracket 201;

a circular groove 303 is formed in the side wall of the upper end portion of the needle tube 301, the circular groove 303 is matched with the locking hole 213, the needle tube 301 is mounted on the needle tube sleeve 202, the upper end portion of the needle tube 301 is hermetically connected with the connecting sleeve 130, and the needle tube 301 is fixed by the locking screw 214;

the motor 150 and the auxiliary device 170 are electrically connected with the main control board 401, and the main control board 401 is fixedly installed on the bottom surface of the negative pressure plate 101;

as shown in fig. 9, and a method of use, comprising the steps of:

s010, according to the property of the sampling solution and the use condition of the eluent, the user selects to start or not start the auxiliary equipment 170;

s020, starting an ion chromatograph body, wherein a first set of detection pipelines of the ion chromatograph body extract a sample through the needle tube 301;

s030, after sampling is finished, stopping the extraction of the first set of pipelines by the ion chromatograph body, and preparing to start to extract a second sample;

s031, after sampling is stopped, driving the needle tube 301 to leave the liquid level and stand still for a certain time, waiting for the sample solution in the needle tube 301 and the negative pressure plate 101 to partially flow out, and avoiding the sample solution from flowing onto external parts or splashing onto external equipment or operators when the needle tube 301 and the negative pressure plate are disassembled and cleaned;

s040, removing the needle tube 301 and blocking the connecting sleeve 130 corresponding to the needle tube by the sealing plug 140, and removing the sealing plug 140 from the other connecting sleeve 130;

s041, the removed needle tube 301 is cleaned, the main control board 401 drives the motor 150 to rotate, and the motor 150 drives the bracket 201 to align to another connecting sleeve 130 where sampling is not performed;

s050, mounting the cleaned needle tube 301 on the needle tube sleeve 202 and inserting the needle tube 301 into the connecting sleeve 130;

step S060, starting the ion chromatograph body, wherein a second set of detection pipelines of the ion chromatograph body extracts a second sample through the needle tube 301;

and S070, after the second sample is sampled, detaching the negative pressure plate 101 and the needle tube 301 for cleaning, and recovering after cleaning.

The negative pressure plate 101 is sealed by the sealing cap 110 and is connected to an extraction device of the ion chromatograph body, such as a plunger pump. When the plunger pump pumps liquid, the negative pressure plate 101 can contain a certain amount of sample liquid in the first negative pressure chamber 105 or the second negative pressure chamber 106, can buffer pulsation in the pumping process, collects sample liquid flowing back or dropping from a pipeline above after pumping is completed, and avoids the situation that the sample liquid is accumulated in a nozzle or a suction nozzle to cause subsequent crystallization to cause blockage. The connecting sleeve 130 mainly has the function of facilitating the sealing and the quick disassembly of the sealing plug 140 and the needle tube 301; the motor 150 can be replaced by a steering engine as required. The needle tube 301 is made of different materials according to different types of sample solutions, so that acid and alkali resistance or other effects can be achieved.

Specifically, as shown in fig. 4 and 5, the upper end surface of the negative pressure plate 101 is provided with a connecting portion 113, and the connecting portion 113 is used for fixedly connecting an ion chromatograph body or an external bracket. Be provided with installation arch 104 on the negative pressure dish 101, installation arch 104 is located on the division wall 102, the position of fixed slot 120 with installation arch 104's position corresponds, simplifies the structure of negative pressure dish 101, and the moulding of being convenient for is moulded, is cut the shaping, reduction in production cost. Generally, the auxiliary device 170 is any one or more of an electrochemical detector, a PH module, a conductivity module, and an ultrasonic generator, and assists in performing sampling, chemical reactions before and after sampling, spontaneous disintegration (such as spontaneous disintegration of certain solid drugs and raw materials in certain PH ranges), and real-time detection of the current state of the solution, so that an operator can make a reasonable judgment to extract a sample solution in a specific PH range and conductivity range.

Specifically, as shown in fig. 6 and 7, a card slot 203 is disposed on any one side or two sides of the bracket 201, an auxiliary bracket 230 is mounted on the card slot 203, a plurality of mounting slots 231 are disposed on the auxiliary bracket 230, the mounting slots 231 are used for mounting a sensor 240, and the sensor 240 is generally one or more of an infrared temperature sensor, a photoelectric sensor, a camera, and the like. A bracket 232 is arranged on the side surface of the auxiliary support 230, an auxiliary circuit board is arranged on the bracket 232 and used for electrically connecting the sensor 240 and the main control board 401, and the main control board 401 sets the initial level and the reset of the sensor 240 through the auxiliary circuit board. The sensor 240 is arranged to record and detect the sampling process, and meanwhile, the risk of mechanical injury is reduced.

Specifically, as shown in fig. 6-8, a side groove 302 is provided on the outer side wall of the lower end of the needle tube 301, and a metal sheet 310 is mounted on the side groove 302, and the metal sheet 310 is used for promoting the sample solution to perform a chemical reaction or promoting the sample solution in an unstable chemical state to decompose spontaneously. The metal sheet 310 is a catalyst or the surface of the metal sheet is coated with a catalyst; further, the number of the side grooves 302 is at least two, at least one of the side grooves 302 is fixedly provided with a detection test paper 320, the detection test paper 320 is used for detecting the current chemical property of the sample solution or detecting impurities, and after the detection test paper 320 detects the impurities and changes color or changes correspondingly, an operator can stop reaction and extract a sample in time.

It should be noted that, in order to facilitate the insertion of the needle tube 301 into the needle sleeve 202 and the connecting sleeve 130, the upper end of the needle tube 301 is generally provided with a chamfer 304.

In summary, the negative pressure plate 101, the motor 150, the connecting piece 220, the bracket 201, the needle tube 301, the main control board 401 and other components are connected together through ingenious structures and matched with corresponding using methods, so that the detection of different types of sample solutions on the ion chromatograph with multiple sets of detection pipelines is realized, the suction nozzle can be conveniently disassembled and cleaned, the suction nozzle does not need to be cleaned through the matching of cleaning equipment in the ion chromatograph, and the internal structure of the ion chromatograph is simplified; the device can be matched with auxiliary reaction equipment, substances, detection equipment and test paper for use, real-time detection in the sampling process is realized, errors and impurities in the sampling process are found in time, and the accuracy is improved. The needle tube is convenient to mount, dismount and clean, can be recycled for many times, and prolongs the service life of the needle nozzle; the negative pressure disk can absorb the sample solution of backward flow, reduces the risk of the internal pipeline or the port crystallization of ion chromatograph body, and the pulsation when can reducing the first time and draw simultaneously reduces the pressure of the internal pipeline of ion chromatograph body. The practical value of the invention is greatly improved.

The above-described examples merely represent one or more embodiments of the present invention, which are described in greater detail and detail, but are not to be construed as limiting the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the spirit of the invention, which falls within the scope of the invention. Therefore, the protection scope of the present invention should be subject to the appended claims.