A liquid chromatograph for pesticide scientific research

Abstract

The utility model discloses a liquid chromatograph for pesticide scientific research, including chromatograph body, the front side of chromatograph body is provided with buffer cabin, the front and back two sides of buffer cabin are provided with hatch respectively, be provided with electric push material board in buffer cabin, buffer cabin outside is provided with inert gas storage bottle and buffer cabin air release valve, inert gas storage bottle is connected with gas supply pipeline, is provided with valve on gas supply pipeline, gas supply pipeline is connected with a plurality of injection pipe and a plurality of air outlet pipe, and the air outlet pipe is located in chromatograph body, be provided with the communication pipeline that corresponds with injection pipe one to one in chromatograph body, and the both ends of communication pipeline are communicated with buffer cabin and chromatograph body inner chamber respectively, and one end that communication pipeline communicated with buffer cabin is provided with injection sleeve, the utility model can carry out once purging to buffer cabin inner chamber and chromatograph inner chamber after feeding, avoid the moisture -containing air of outside to enter chromatograph inside, reduce the condensate on the surface of temperature control module, thereby protect the electrical components in chromatograph body, prolong its working life.

Description

Technical Field

[0001] This utility model relates to the field of testing instruments, specifically to a liquid chromatograph for pesticide research. Background Technology

[0002] Liquid chromatography (LC) is essential for pesticide research and testing. It is a crucial analytical tool for separating, defining, and quantifying mixtures of compounds. However, in practical use, it has been found that condensation easily forms on the surface of the temperature control module of existing LC instruments, especially when the ambient humidity in the laboratory is high. This condensation can trigger instrument alarms and cause abnormal shutdowns. The reason for this is that ambient air enters the instrument during material feeding and discharging, and there is a significant temperature difference between this air and the temperature control module, resulting in condensation. Effectively preventing condensation caused by this issue is a problem that urgently needs to be solved. Utility Model Content

[0003] In view of the problems existing in the background art, the purpose of this utility model is to provide a liquid chromatograph for pesticide research, which effectively solves the problems existing in the background art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A liquid chromatograph for pesticide research includes a chromatograph body, a buffer chamber at the front of the chromatograph body, doors on the front and rear sides of the buffer chamber, an electric pusher plate inside the buffer chamber, an inert gas storage bottle and a buffer chamber vent valve outside the buffer chamber, a gas supply line connected to the inert gas storage bottle, a valve on the gas supply line, multiple ejector tubes and multiple outlet tubes connected to the gas supply line, the outlet tubes being located inside the chromatograph body; a connecting line corresponding to each ejector tube is provided inside the chromatograph body, one end of the connecting line connecting to the buffer chamber and the other end connecting to the chromatograph body, a one-way valve plate inside the connecting line, an ejector sleeve at the end of the connecting line connecting to the buffer chamber, the ejector sleeve having a tapered section, a straight section and a diffusing section arranged from bottom to top inside the ejector sleeve, the ejector tube being coaxially inserted inside the ejector sleeve with the ejector tube outlet located at the straight section.

[0006] Furthermore, the door on the front side of the buffer compartment is hinged to the buffer compartment on one side and a lock is provided between the door and the buffer compartment on the other side. A sealing gasket that cooperates with the door is also provided on the front side of the buffer compartment.

[0007] Furthermore, the door at the rear of the buffer chamber is vertically movable and is installed inside the chromatograph body, and the chromatograph body is equipped with a door lifting track and an electric telescopic rod for driving the door.

[0008] Furthermore, the door on the rear side of the buffer chamber is covered with a polytetrafluoroethylene (PTFE) liner, which is in close contact with the inner wall of the chromatograph body and the door lifting track.

[0009] Furthermore, the vent valve of the buffer chamber includes a valve pipe, the inner cavity of which is narrow at the bottom and wide at the top. The narrow section is connected to the inner cavity of the buffer chamber, and the wide section is equipped with a float and a float anti-escape rod.

[0010] Furthermore, the one-way valve plate includes an inclined valve plate seat and a valve plate that cooperates with the valve plate seat. The valve plate seat is provided with a through hole. The upper side of the valve plate is hinged to the valve plate seat. When the valve plate is attached to the valve plate seat, the through hole is closed.

[0011] Furthermore, a grid is provided at one end of the connecting pipe that connects to the internal cavity of the chromatograph.

[0012] Furthermore, the gas outlet pipe is located near the rear side of the internal cavity of the chromatograph body, the gas outlet pipe is vertically arranged, and multiple gas outlet holes are evenly distributed along the vertical direction on the gas outlet pipe.

[0013] This utility model has the following beneficial technical effects:

[0014] This invention incorporates a buffer chamber, which, after feeding, purges both the inner cavity of the buffer chamber and the inner cavity of the chromatograph, effectively preventing moisture-laden air from entering the chromatograph. After purging, the material in the buffer chamber is automatically pushed to the sampling claw of the autosampler on the chromatograph body for subsequent processing, similar to existing technologies. This design is convenient for researchers. This application features a novel design, stable operation, and effectively reduces condensation on the surface of the temperature control module, thereby protecting the electrical components inside the chromatograph body and extending its service life. It is highly practical. Attached Figure Description

[0015] Figure 1 The front view of this embodiment of the invention after removing the front hatch;

[0016] Figure 2 This is a right view of the internal structure of an embodiment of the present utility model;

[0017] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle. Detailed Implementation

[0018] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0019] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] like Figure 1-3 As shown in this embodiment, a liquid chromatograph for pesticide research includes a chromatograph body 1, a buffer chamber 2 on the front side of the chromatograph body 1, openings on both the front and rear sides of the buffer chamber 2, and doors 3 on the front and rear sides of the buffer chamber 2 respectively. The left side of the door 3 on the front side of the buffer chamber 2 is hinged to the buffer chamber 2, and the right side is fitted with a lock 4 between the door 3 and the buffer chamber 2. A sealing gasket that cooperates with the door 3 is also provided on the front side of the buffer chamber 2. The door 3 on the rear side of the buffer chamber 2 is raised and lowered inside the chromatograph body 1. The chromatograph body 1 is provided with a door lifting track 5 and an electric telescopic rod 6 for driving the door. The door 3 on the rear side of the buffer chamber 2 is covered with a polytetrafluoroethylene liner 7, which is in close contact with the inner wall of the chromatograph body 1 and the door lifting track 5.

[0021] The buffer chamber 2 is equipped with an electric pusher plate, which includes an electric telescopic rod 8 and an L-shaped rod 9 at the end of the electric telescopic rod 8. A horizontal plate 10 is provided on the L-shaped rod 9. The buffer chamber 2 is equipped with a material-swinging platform 11, which is equipped with a clearance groove 12 that cooperates with the L-shaped rod 9.

[0022] An inert gas storage cylinder 13 and a buffer chamber vent valve 14 are installed outside the buffer chamber 2. Preferably, the inert gas storage cylinder 13 is detachably mounted on a mounting base 15, which is located on the top outer surface of the buffer chamber 2. The mounting base 15 is connected to a gas supply pipe 16. After the inert gas storage cylinder 13 is installed inside the mounting base 15, it is connected to the gas supply pipe 16. The connection structure between the mounting base 15 and the inert gas storage cylinder 13 can refer to existing cassette furnaces. A valve 17 is installed on the gas supply pipe 16. The inert gas storage cylinder 13 contains nitrogen or argon gas and is pressurized. The gas supply pipe 16 is connected to multiple ejector tubes 19 and multiple outlet pipes 20 via gas pipes 18. 20 is located inside the chromatograph body 1. The gas outlet pipe 20 is close to the rear side of the inner cavity of the chromatograph body 1. The gas outlet pipe 20 is vertically arranged and has multiple gas outlet holes evenly distributed along the vertical direction. The chromatograph body 1 is provided with a connecting pipe 21 corresponding to the ejector tube 19. One end of the connecting pipe 21 is connected to the buffer chamber 2 and the other end is connected to the chromatograph body 1. A one-way valve plate is provided in the connecting pipe 21. The one-way valve plate includes an inclined valve plate seat 22 and a valve plate 23 that cooperates with the valve plate seat 22. A through hole 24 is provided on the valve plate seat 22. The upper side of the valve plate 23 is hinged to the valve plate seat 22. When the valve plate 23 is attached to the valve plate seat 22, the through hole 24 is closed.

[0023] One end of the connecting pipe 21, which is connected to the buffer chamber 2, is screwed with an ejector sleeve 25. The other end of the connecting pipe 21, which is connected to the inner cavity of the chromatograph body 1, is provided with a grid 26. The ejector sleeve 25 is provided with a tapering section 27, a straight section 28, and a expanding section 29 from bottom to top. The ejector tube 19 is coaxially inserted into the ejector sleeve 25 and the outlet of the ejector tube 19 is located at the straight section 28.

[0024] The aforementioned buffer chamber vent valve 14 includes a valve pipe with a narrower lower section and a wider upper section. The narrower section communicates with the inner cavity of the buffer chamber, while the wider section contains a float 30 and a float anti-escape rod 31.

[0025] The working principle of this embodiment is as follows:

[0026] During operation, open the front door 3 of buffer chamber 2, place the material on the loading platform 11 and align it with the horizontal plate 10, close and lock the front door 3 of buffer chamber 2, open the valve on the gas supply pipeline 16 for 5-8 seconds and then close it. The gas supplied from the inert gas storage bottle 13 enters the ejector tube 19 and the outlet pipe 20 through the gas supply pipeline 16. The ejector tube 19, in conjunction with the ejector sleeve 25, draws in the air inside the connecting pipeline 21 and the chromatograph body 1. The gas from the outlet pipe 20 fills the interior of the chromatograph body 1. The gas from buffer chamber 2 is discharged through the buffer chamber vent valve 14. Specifically, the float 30 is lifted but will not fall out under the action of the float anti-escape rod 31. When venting stops, the float 30 falls down, roughly sealing the upper opening of the narrow section. When buffer chamber 2 is venting, the gas will enter through the front door 3 of buffer chamber 2. Moisture-containing air from the outside is expelled to prevent it from entering the chromatograph body 1. After the buffer chamber 2 is vented, the rear door 3 of the buffer chamber 2 is opened, and the electric pusher plate is controlled to push the material to the original autosampler claw of the chromatograph body 1 for subsequent processing. The chromatograph body 1 is also equipped with components such as a temperature control module and a column oven, which are the same as those in the prior art and will not be described in detail here. Compared with the prior art, this embodiment is equipped with a buffer chamber 2. After feeding, the inner cavity of the buffer chamber 2 and the inner cavity of the chromatograph body 1 can be purged once, which effectively prevents moisture-containing air from entering the chromatograph and makes it less likely for condensation to form on the outer wall of the temperature control module. This protects the electrical components inside the chromatograph body 1 and extends the working life of the chromatograph body 1, which has strong practicality.

[0027] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A liquid chromatograph for pesticide research, comprising a chromatograph body, characterized in that, A buffer chamber is provided on the front side of the chromatograph body. Doors are provided on the front and rear sides of the buffer chamber. An electric pusher plate is provided inside the buffer chamber. An inert gas storage bottle and a buffer chamber vent valve are provided outside the buffer chamber. The inert gas storage bottle is connected to a gas supply pipeline, which is equipped with a valve. The gas supply pipeline is connected to multiple ejector tubes and multiple outlet tubes, with the outlet tubes located inside the chromatograph body. A connecting pipeline corresponding to each ejector tube is provided inside the chromatograph body. One end of each connecting pipeline is connected to the buffer chamber, and the other end is connected to the internal cavity of the chromatograph body. A one-way valve plate is provided inside the connecting pipeline. An ejector sleeve is provided at the end of the connecting pipeline connected to the buffer chamber. The ejector sleeve has a tapered section, a straight section, and a diffusing section arranged from bottom to top. The ejector tube is coaxially inserted into the ejector sleeve, with the ejector tube outlet located at the straight section.

2. The liquid chromatograph for pesticide research according to claim 1, characterized in that, The door on the front side of the buffer compartment is hinged to the buffer compartment on one side and a lock is provided between the door and the buffer compartment on the other side. A sealing gasket that cooperates with the door is also provided on the front side of the buffer compartment.

3. The liquid chromatograph for pesticide research according to claim 2, characterized in that, The door at the rear of the buffer chamber is mounted in the chromatograph body and is equipped with a door lifting track and an electric telescopic rod for driving the door.

4. The liquid chromatograph for pesticide research according to claim 3, characterized in that, The door on the rear side of the buffer chamber is covered with a polytetrafluoroethylene (PTFE) liner, which is in close contact with the inner wall of the chromatograph and the door lifting track.

5. A liquid chromatograph for pesticide research according to claim 1, characterized in that, The vent valve of the buffer chamber includes a valve pipe with a narrower inner cavity at the bottom and a wider inner cavity at the top. The narrower section is connected to the inner cavity of the buffer chamber, and the wider section is equipped with a float and a float anti-escape rod.

6. The liquid chromatograph for pesticide research according to claim 1, characterized in that, The one-way valve plate includes an inclined valve plate seat and a valve plate that cooperates with the valve plate seat. The valve plate seat is provided with a through hole. The upper side of the valve plate is hinged to the valve plate seat. When the valve plate is attached to the valve plate seat, the through hole is closed.

7. A liquid chromatograph for pesticide research according to claim 1, characterized in that, A grid is provided at one end of the connecting pipe that connects to the internal cavity of the chromatograph.

8. The liquid chromatograph for pesticide research according to claim 1, characterized in that, The gas outlet pipe is located near the rear side of the internal cavity of the chromatograph body. The gas outlet pipe is vertically arranged and has multiple gas outlet holes evenly distributed along the vertical direction.

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