A novel sample injection chamber

Abstract

The utility model discloses a novel sample introduction chamber, including sample introduction chamber body, the sample introduction chamber body includes the hollow cavity of through, the hollow cavity forms the feed port to the opening upwards, the hollow cavity can respectively with the sealed intercommunication of combustion pipe inner chamber and guide pipe inner chamber and forms the sample introduction passageway, still includes the sealing assembly, the sealing assembly can open or close the feed port, and the sealing assembly includes the liquid inlet hole that can communicate with the feed port. The utility model discloses rational in structure, convenient solid and liquid form sample injection, be favorable to improve the accuracy and stability of detection result.

Description

Technical Field

[0001] This utility model relates to the field of ion chromatography detection technology, specifically a novel sample injection chamber. Background Technology

[0002] In existing online combustion ion chromatography (OCC) detection, the sample to be tested is usually a solid or liquid. The sample boat containing the sample is manually placed into the injection chamber to complete the injection operation. Improper operation can lead to substandard sealing of the sample boat chamber, affecting the accuracy and stability of the detection results. Existing technologies also use a drop-feed method for sample boat injection, as shown in patent application CN202220631605.0 entitled "A Sample Boat Chamber for an Online Combustion Ion Chromatography System with Convenient Loading and Unloading." However, when the sample to be tested is a liquid, the shaking of the sample boat during the drop-feed process and the impact of the drop on the sample boat at the push rod tip often cause the liquid sample to splash out of the sample boat, contaminating the injection chamber and seriously affecting the accuracy and stability of the detection results. Utility Model Content

[0003] This utility model discloses a novel sample injection chamber, which solves the technical problems of liquid sample splashing and contamination of the injection chamber, affecting the accuracy and stability of test results, in existing technologies that use a drop-feed method for sample boat injection. It features a reasonable structure, facilitates the injection of both solid and liquid samples, and improves the accuracy and stability of test results. The technical solution adopted is as follows: A novel sample inlet chamber includes a sample inlet chamber body, the sample inlet chamber body including a through hollow cavity, the hollow cavity opening upward to form a feed port, the hollow cavity being able to be sealed and connected to the inner cavity of a combustion tube and the inner cavity of a guide tube respectively to form a sample inlet passage, and also including a sealing assembly, the sealing assembly being able to open or close the feed port, and the sealing assembly including a liquid inlet hole that can communicate with the feed port.

[0004] Based on the above technical solution, the inlet hole is sealed with an elastic pad, through which the injection needle can pass to complete the injection. Preferably, the elastic pad is designed to effectively seal the inlet hole while being easily punctured by the injection needle tip, such as a rubber pad.

[0005] Based on the above technical solution, the sealing assembly can slide along the axial direction of the sample inlet body to open or close the feed port.

[0006] Based on the above technical solution, the sealing assembly includes a sealing cylinder, which is sleeved outside the sample inlet chamber body and can slide along the axial direction of the sample inlet chamber body to open or close the feed port, and the side wall of the sample inlet chamber body includes a sample inlet notch to avoid the grippers holding the sample boat.

[0007] Based on the above technical solution, the first end of the sealing assembly is hinged to the sample inlet body, and the second end of the sealing assembly is connected to the sample inlet body through a locking member to open or close the feed port.

[0008] Based on the above technical solution, the sealing assembly includes a sealing cover, the first end of which is hinged to the upper part of the sample inlet chamber body, and the second end of which is connected to the sample inlet body through a locking member to open or close the feed port. A movable cover is sealed to the through hole on the sealing cover, a transparent window is formed on the movable cover, and the liquid inlet hole is formed on the movable cover.

[0009] Based on the above technical solution, a cooling unit for cooling the sample injection chamber body and the sample boat therein is fixedly provided below the sample injection chamber body.

[0010] Based on the above technical solution, the cooling unit includes a fan.

[0011] Based on the above technical solution, the cooling unit further includes heat dissipation fins, the first end of the sealing assembly is hinged to the sample inlet body, the second end of the sealing assembly is connected to the sample inlet body through a locking member to open or close the feed port, and the heat dissipation fins are fixedly connected upward to the sample inlet body.

[0012] Based on the above technical solution, the heat dissipation fins are fixedly connected to the sample inlet chamber body upwards via a Peltier module.

[0013] Beneficial effects This invention features a rationally designed structure. The hollow cavity of the sample inlet body forms an upward-facing inlet, facilitating the placement and removal of the sample boat or the dropping of a sample boat containing solid particles from the inlet to the front end of the push rod. A sealing component is used to open and close the inlet, and the sealing component is equipped with a liquid inlet hole. This allows for sample injection via a liquid injection needle through the liquid inlet hole while the sealing component closes the inlet. The rational structural design simplifies the sample injection operation and prevents liquid samples from splashing outwards when the sample boat is dropped, thus improving the accuracy and stability of the test results. Furthermore, the sample inlet of this application is multifunctional, suitable not only for solid particle sample injection but also for liquid sample injection, offering good flexibility and avoiding the need to change the sample inlet chamber to adapt to solid particle or liquid sample injection.

[0014] In this invention, the liquid inlet hole is sealed with an elastic pad, and the injection needle can pass through the elastic pad to complete the injection. This not only ensures a good seal in the hollow cavity, but also facilitates injection, making the design reasonable.

[0015] In this invention, the sealing assembly can slide axially to open and close the feed inlet, or flip up and down to open and close the feed inlet, offering flexible design suitable for various working conditions. Furthermore, to prevent high-temperature environments from affecting sample properties, a cooling unit is also provided to further improve the accuracy and stability of the test results, especially for highly volatile lightweight liquid samples, where good cooling can reduce volatilization. Specifically, when the sealing assembly flips up and down to open and close the feed inlet, the cooling unit also includes a Peltier module, heat dissipation fins, and a fan arranged sequentially, enabling rapid cooling and preventing high-temperature environments from affecting product properties. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other embodiments can be derived from the provided drawings without creative effort.

[0017] Figure 1 Example 1: A three-dimensional structural diagram of the sample inlet chamber assembled with the combustion tube and guide tube; Figure 2 Example 1: A three-dimensional structural diagram of the sealed cylinder with the feed inlet open; Figure 3 : Figure 2 A cross-sectional view of the main structure of the middle sealing cylinder when the feed inlet is open; Figure 4 Example 2: A three-dimensional structural diagram of the sample inlet chamber assembled with the combustion tube and guide tube; Figure 5 Schematic diagram of the three-dimensional structure of the sample injection chamber in Example 2 Figure 1 ; Figure 6 Schematic diagram of the three-dimensional structure of the sample injection chamber in Example 2 Figure 2 ; Detailed Implementation The following description and accompanying drawings fully illustrate specific embodiments described herein to enable those skilled in the art to practice them. Some embodiments may include or substitute parts and features of other embodiments. The scope of the embodiments herein encompasses the entire scope of the claims and all available equivalents thereof. Throughout this document, the terms “first,” “second,” etc., are used only to distinguish one element from another without requiring or implying any actual relationship or order between the elements. Indeed, a first element can also be referred to as a second element, and vice versa. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a structure, apparatus, or device. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the structure, apparatus, or device that includes said element. The various embodiments described herein are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments; similar or identical parts between embodiments can be referred to interchangeably.

[0018] The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in this document to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. They are used solely for the convenience of describing the document and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description herein, unless otherwise specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two elements; they can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0019] In this document, unless otherwise stated, the term "multiple" means two or more.

[0020] In this article, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0021] In this article, the term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0022] Example 1 like Figures 1-3 The novel sample inlet chamber shown includes a sample inlet chamber body 41, which includes a through hollow cavity 412. The hollow cavity 412 opens upward to form a feed inlet 413. Mechanical grippers extend into the feed inlet 413 to pick up and place the sample boat, or a dropping method is used to allow the sample boat to fall through the feed inlet 413 onto the front end of the push rod under its own weight. The hollow cavity 412 can be sealed and connected to the inner cavity of the combustion tube 20 and the inner cavity of the guide tube 50 to form a sample inlet passage. It also includes a sealing assembly that can open or close the feed port 413, and the sealing assembly includes a liquid inlet 421 that can communicate with the feed port 413. The liquid inlet 421 is covered with an elastic pad, and the injection needle can pass through the elastic pad to complete the injection. The elastic pad is designed to seal the liquid inlet well and be easily punctured by the injection needle tip, such as a rubber pad.

[0023] In this embodiment, the sealing assembly can slide axially along the sample inlet body 41 to open or close the feed inlet 413. Specifically, the sealing assembly includes a sealing cylinder 42, which is coaxially sleeved outside the sample inlet body 41 and can slide axially along the sample inlet body 41 to open or close the feed inlet 413, such as... Figure 2 As shown, it also includes a first drive unit 60, which includes a motor, a lead screw, and a lead screw nut that cooperates with the lead screw. The two ends of the lead screw are rotatably connected to the worktable where the sample injection chamber body 41 is located. The lead screw nut is slidably connected to the worktable. The motor is fixed to the worktable and can transmit rotational motion to the lead screw. The lead screw nut is fixed to the outer wall of the sealing cylinder 42 through the connecting plate 422, so that the sealing cylinder 42 can be driven to slide along the axial direction of the sample injection chamber body 41.

[0024] like Figure 3 As shown, the side wall of the sample inlet chamber body 41 includes a sample inlet notch 411 to avoid the grippers holding the sample boat, which facilitates the automated loading and unloading of the sample boat and provides convenient conditions for tracking and recording the situation of the sample before and after combustion in the sample boat.

[0025] In addition, a cooling unit for cooling the sample injection chamber body 41 and the sample boat therein is fixedly installed below the sample injection chamber body 41. In this embodiment, the cooling unit includes a fan 47 (not shown), so that when the fan 47 is turned on, it can accelerate the airflow in and around the lower part of the sample injection chamber body 41, improve the heat exchange efficiency, and reduce the impact of the high temperature environment of the combustion tube 20 on the sample in the sample injection chamber.

[0026] When the sample to be tested is in the form of solid particulate matter, the working process is as follows: S1, the seal 42 slides backward under the action of the first drive unit 60, opening the feed port 413; S2. The mechanical gripper places the sample boat loaded with solid particulate matter sample into the sample inlet 413 and places it at the front end of the push rod inside the sample inlet body 41. Then, the sealing cylinder 42 is reset and the inlet 413 is closed under the action of the first drive unit 60. S3. After the sample boat returns to the sample inlet body 41 after combustion is complete, the sealing cylinder 42 slides backward under the action of the first drive unit 60, opening the feed port 413. S4. The mechanical grippers remove the sample boat from the sample inlet chamber body 41; This cycle repeats itself.

[0027] When the sample to be tested is in liquid form, before the sample injection begins, the sealing cylinder 42 slides backward under the action of the first drive unit 60 to open the feed port 413. Then the mechanical gripper places the empty sample boat at the front end of the push rod. After that, the sealing cylinder 42 resets and closes the feed port 413 under the action of the first drive unit 60. This completes the sample boat placement. The sample boat can be reused multiple times. The subsequent sample injection process is as follows: S1. The injection needle draws up the sample solution; S2. The injection needle moves to above the liquid inlet, pierces the elastic pad downwards and stays above the sample boat, and then the injection needle injects liquid into the sample boat; S3. Then the injection needle is reset to its initial position and cleaned. This cycle repeats itself.

[0028] Example 2 The difference between Example 2 and Example 1 is that, as Figures 4-6 As shown, the sealing assembly includes a sealing cap 43. The first end of the sealing cap 43 is hinged to the upper part of the sample inlet chamber body 41, and the second end of the sealing cap 43 is connected to the side of the sample inlet chamber body 41 via a locking member 44 to open or close the feed port 413. The locking member 44 is prior art, and those skilled in the art can select it according to their needs.

[0029] like Figure 4 As shown, the through hole on the sealing cap 43 is sealed to the movable cap 432. The movable cap 432 has an annular transparent window 433 for easy viewing of the sample injection status. The liquid inlet hole 431 is formed on the movable cap 432, which makes it easy to remove the movable cap for replacement of the elastic gasket.

[0030] like Figure 5 As shown, the bottom outer edge of the sample inlet chamber body 41 extends horizontally outward to form a flange, which increases the heat dissipation area and facilitates the installation of the cooling unit.

[0031] In this embodiment, the cooling unit includes a Peltier module 45, heat dissipation fins 46, and a fan 47, which are fixedly arranged sequentially from the bottom of the sample inlet chamber body 41 downwards. The Peltier module 45 is fixedly connected upwards to the flange at the bottom of the sample inlet chamber body 41. The Peltier module 45 is existing technology and can be selected by those skilled in the art according to their needs. It can quickly cool down the sample. The heat dissipation fins 46 include several vertically arranged and parallel heat dissipation plates, which are fixedly connected upwards to the Peltier module 45, increasing the heat dissipation area and improving the heat dissipation effect. The fan 47 is fixedly arranged to accelerate the airflow around the heat dissipation fins 46, improving heat exchange efficiency.

[0032] This embodiment is applicable to sample injection in liquid form. Before the injection begins, the sealing cap 43 is flipped to open the feed port 413. The mechanical gripper places the empty sample boat at the front end of the push rod, and then the sealing cap 43 is locked with the locking fastener 44. The sample boat can be reused multiple times. The subsequent sample injection process is as follows: S1. The injection needle draws up the sample solution; S2. The injection needle moves to above the liquid inlet 431, pierces the elastic pad downwards and stays above the sample boat, and then the injection needle injects liquid into the sample boat. S3. Then the injection needle is reset to its initial position and cleaned. This cycle repeats itself.

[0033] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A novel sample inlet chamber, comprising a sample inlet chamber body (41), wherein the sample inlet chamber body (41) includes a through hollow cavity (412), the hollow cavity (412) opening upward to form a feed inlet (413), the hollow cavity (412) being respectively sealed and connected to the inner cavity of a combustion tube (20) and the inner cavity of a guide tube (50) to form a sample inlet passage, characterized in that, It also includes a sealing assembly that can open or close the feed port, and the sealing assembly includes a liquid inlet (421, 431) that can communicate with the feed port.

2. The novel sample inlet chamber according to claim 1, characterized in that, The inlet holes (421, 431) are sealed with elastic pads, and the injection needle can pass through the elastic pads to complete the injection.

3. The novel sample inlet chamber according to claim 2, characterized in that, The sealing assembly can slide axially along the sample inlet body (41) to open or close the feed port (413).

4. The novel sample inlet chamber according to claim 3, characterized in that, The sealing assembly includes a sealing cylinder (42) which is sleeved outside the sample inlet body (42) and can slide along the axial direction of the sample inlet body (42) to open or close the feed port (413). The side wall of the sample inlet body (41) includes a sample inlet notch (411) to avoid the grippers holding the sample boat.

5. The novel sample inlet chamber according to claim 2, characterized in that, The first end of the sealing assembly is hinged to the sample inlet body (41), and the second end of the sealing assembly is connected to the sample inlet body (41) via a locking element (44) to open or close the feed port (413).

6. The novel sample inlet chamber according to claim 5, characterized in that, The sealing assembly includes a sealing cap (43), the first end of which is hinged to the upper part of the sample inlet body (41), and the second end of which is connected to the sample inlet body (41) via a locking member (44) to open or close the feed port (413). A movable cap (432) is sealed to the through hole on the sealing cap (43), and a transparent window (433) is formed on the movable cap (43), and the liquid inlet hole (431) is formed on the movable cap (43).

7. The novel sample introduction chamber according to any one of claims 1 to 6, characterized in that, A cooling unit for cooling the sample injection chamber body and the sample boat therein is fixedly installed below the sample injection chamber body (41).

8. The novel sample inlet chamber according to claim 7, characterized in that, The cooling unit includes a fan (47).

9. The novel sample inlet chamber according to claim 8, characterized in that, The cooling unit also includes heat dissipation fins (46), the first end of the sealing assembly is hinged to the sample inlet body (41), the second end of the sealing assembly is connected to the sample inlet body (41) through a locking member (44) to open or close the feed port (413), and the heat dissipation fins (46) are fixedly connected upward to the sample inlet body (41).

10. The novel sample inlet chamber according to claim 9, characterized in that, The heat dissipation fins (46) are fixedly connected to the sample inlet chamber body (41) upwards via a Peltier module (45).

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