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CN-121994982-A - High-pressure liquid phase medium sampling device

CN121994982ACN 121994982 ACN121994982 ACN 121994982ACN-121994982-A

Abstract

The invention discloses a high-pressure liquid-phase medium sampling device, and relates to the technical field of six-way sampling valves. The six-way sampling valve solves the problems that a sealing surface is easy to fail in sampling a high-pressure liquid medium and a valve element is damaged due to reverse transmission of medium pressure, eliminates impact of the high-pressure liquid medium through a flow path buffer assembly, avoids damage of a flow path matching surface, simultaneously blocks reverse transmission of overpressure medium pressure, prevents permanent damage of the valve element, ensures medium flow stability of constant volume sampling, converts circumferential rotation into axial movement by means of an axial sealing assembly, realizes axial and radial double sealing pretension of the flow path matching surface, solves the problem of sealing surface failure, avoids sampling doping and ensures sampling purity, has compact structure, retains the advantages of high pressure non-leakage of the six-way sampling valve, adapts to high-pressure, micro-liter-level constant volume and multiphase corrosive liquid medium sampling scenes, and improves the running stability and scene suitability of the device.

Inventors

  • JIANG YONGDONG
  • MEI QIHONG
  • CHEN TIANXIANG

Assignees

  • 北京戈韦尼克工程技术有限公司

Dates

Publication Date
20260508
Application Date
20260320

Claims (8)

  1. 1. A high pressure liquid phase medium sampling device, comprising: The novel rotary valve comprises a valve seat (1), wherein a shaft seal (11) is arranged in the valve seat (1), a rotary rod (7) is arranged on the shaft seal (11), the upper end of the rotary rod (7) is connected with a rotary core seat (12), and arc-shaped flow passages (9) which are distributed at an angle of 60 degrees are formed in the rotary core seat (12); the stator (2), the stator (2) is set up on valve base (1), offer the circulation hole (10) that is connected with arc runner (9) smoothly on the stator (2), the opening of the correspondent circulation hole (10) of the stator (2) installs the interface cover (3); The flow path buffer assembly comprises flow path buffer sheets (15) arranged in the interface cover (3), wherein the flow path buffer sheets (15) are distributed in an umbrella shape, and annular spring groups (19) connected with the inner wall of the interface cover (3) are arranged at the upper end of the outer ring side.
  2. 2. The high-pressure liquid-phase medium sampling device according to claim 1, wherein an axial sealing plate (13) is mounted on the rotary core seat (12), an axial sealing assembly is arranged at the outer end of the axial sealing plate (13), the axial sealing assembly comprises sealing elastic rings (16), the sealing elastic rings (16) are stacked in an annular mode, and deformation grooves (17) are formed in the end portions of the sealing elastic rings (16) in a staggered mode from bottom to top.
  3. 3. The high-pressure liquid-phase medium sampling device according to claim 2, wherein a screw rod (14) is connected to the upper end of the axial sealing plate (13) in a threaded manner, and the screw rod (14) is fixedly connected with the inner top of the stator (2).
  4. 4. The high-pressure liquid-phase medium sampling device according to claim 1, wherein an interface seat (18) matched with the flow hole (10) is arranged on the outer side of the interface cover (3), a fluid inlet attached to the bottom of the unfolded flow path buffer sheet (15) is formed in the lower end of the interface cover (3), and a tangential flow channel (20) is formed in the top of the interface cover (3) corresponding to the flow path buffer sheet (15).
  5. 5. The high-pressure liquid medium sampling device according to claim 4, wherein the valve seat (1) is respectively connected with a quantitative ring (4), a sample flow path tube (5) and a waste liquid tube (6) through an interface cover (3).
  6. 6. The high-pressure liquid-phase medium sampling device according to claim 5, wherein the quantitative ring (4) is a hollow capillary runner with a fixed volume, and the quantitative ring (4) is connected to two vertically corresponding interface covers (3) for constant volume sampling of the high-pressure liquid-phase medium.
  7. 7. The high-pressure liquid medium sampling device according to claim 5, wherein the interface cover (3) is used for connection of a sample flow path inlet, a sample flow path outlet, a quantifying ring (4) inlet, a quantifying ring (4) outlet, a manual sample inlet and a waste liquid port, wherein the quantifying ring (4) inlet and the quantifying ring (4) outlet are used for connection of the quantifying ring (4), the waste liquid port is used for connection of a waste liquid pipe (6), and the sample flow path inlet and the sample flow path outlet are used for connection of the sample flow path pipe (5).
  8. 8. A high pressure liquid phase medium sampling device according to claim 1, characterized in that the top of the stator (2) is provided with an indication arrow (8) for the communication indication of two arcuate flow channels (9) with two sets of flow holes (10) respectively.

Description

High-pressure liquid phase medium sampling device Technical Field The invention relates to the technical field of six-way sampling valves, in particular to a high-pressure liquid phase medium sampling device. Background The six-way sampling valve is a core sampling component for High Pressure Liquid Chromatography (HPLC), high pressure liquid phase process on-line sampling and other scenes, has the core advantages of realizing leakage-free flow path switching and constant volume accurate sampling under high pressure working conditions, and is suitable for the characteristics of high pressure liquid medium typical 10-40 MPa working pressure, mu L level constant volume sampling, multiphase/corrosive liquid medium and the like. Refer to patent application number 202122250543.7 and disclose a microsampling device based on six-way valve, it sets up key parts such as quantitative ring in six-way valve inside, and under the prerequisite that valve body itself volume lacks and holds the ration capacity, and under different sampling demands, quantitative ring embeds and can not effectively extend even be difficult to change, leads to its volume precision to be difficult to guarantee, and the volume precision then directly influences the sampling precision. As described in the content of an automatic sampler of a liquid chromatograph disclosed in patent application No. 201710736196.4, the sampling requirement structure of the quantitative ring is improved, and the quantitative ring is designed into a structure with the sampling quantity changed by a syringe, but the existing quantitative ring can be realized by a partial liquid filling method under the condition of determining the sampling requirement, so that the physical volume of the quantitative ring is not changeable, and accurate sampling can be realized under the condition of not replacing the quantitative ring by the partial liquid filling method, thereby avoiding the problem of inaccurate sampling possibly caused by the pushing by the syringe. However, the existing high-pressure six-way sampling valve can meet the basic sampling requirement, but the problem of failure of a sealing surface is very easy to occur in the process of long-term high-frequency rotation switching (friction between a rotor and a stator ceramic surface) or when liquid phase medium contains microparticles, so that sampling doping of the high-pressure liquid phase medium is caused, or the problem of permanent damage of the high-pressure liquid phase medium is caused by reverse conduction to a valve element when the pressure of a liquid phase main path is over-pressurized, so that the problem to be solved in the prior art is urgent, as described above, and the application provides a solution for ensuring sampling precision and effective sealing. Disclosure of Invention The invention aims to provide a high-pressure liquid-phase medium sampling device which is used for solving the problems in the background art. The high-pressure liquid phase medium sampling device comprises a valve seat, wherein a shaft seal is arranged in the valve seat, a rotating rod is arranged on the shaft seal, the upper end of the rotating rod is connected with a rotating core seat, and arc-shaped flow passages distributed at an angle of 60 degrees are formed in the rotating core seat; The stator is arranged on the valve seat, a circulation hole which is smoothly connected with the arc-shaped flow channel is formed in the stator, and an interface cover is arranged at an opening of the stator corresponding to the circulation hole; The flow path buffer assembly comprises flow path buffer sheets arranged in the interface cover, the flow path buffer sheets are distributed in an umbrella shape, and the upper end of the outer ring side is provided with an annular spring group connected with the inner wall of the interface cover. The rotary core seat is further provided with an axial sealing plate, the outer end of the axial sealing plate is provided with an axial sealing assembly, the axial sealing assembly comprises sealing elastic rings, the sealing elastic rings are stacked in an annular mode, and deformation grooves are formed in the end portions of the sealing elastic rings in a staggered mode from bottom to top. The axial sealing plate is further provided with a screw rod in threaded connection with the upper end of the axial sealing plate, and the screw rod is fixedly connected with the inner top of the stator. The connector is further arranged in such a way that an interface seat matched with the circulation hole is arranged on the outer side of the interface cover, a fluid inlet attached to the bottom of the unfolded flow path buffer sheet is arranged at the lower end of the interface cover, and a flow channel is arranged at the top of the interface cover corresponding to the flow path buffer sheet. The valve seat is further provided with a quantifying ring, a sample flow path pipe and a waste liquid pipe which a