A multi-channel flow path for a rapid solvent extraction instrument

Abstract

This utility model discloses a multi-channel flow path for a rapid solvent extraction instrument, relating to the field of solvent extraction instrument technology. The multi-channel flow path includes a gas supply path, a liquid supply path, and several extraction paths. Each extraction path includes a first pipeline, an upper three-way valve, a first pressure sensor, an extraction unit, a second pipeline, and a condenser, a lower three-way valve, and a collection unit sequentially arranged on the second pipeline. The extraction unit is located between the first pressure sensor and the condenser. The liquid supply path is connected to the upper three-way valve pipeline. The gas supply path includes a gas supply pipe and a proportional valve and a gas multi-channel diversion module sequentially arranged on the gas supply pipe. The gas multi-channel diversion module is connected to the upper three-way valve pipeline. By adding a proportional valve to the gas supply path, when residual solvent in the extraction paths needs to be cleaned, the proportional valve can control the pressure of the gas entering the first pipeline, making it easier to purge samples when they are viscous, thus solving the problem of incomplete solution discharge.

Description

Technical Field

[0001] This utility model relates to the field of solvent extraction instrument technology, and more specifically, to a multi-channel flow path for a rapid solvent extraction instrument. Background Technology

[0002] Currently, rapid solvent extraction instruments on the market generally use two types of high-pressure rotary valves: 1. Four-way valve: This type of valve shares one valve for two flow paths. The four-way valve is prone to cross-contamination, and when one channel leaks, other channels will also experience abnormalities, resulting in sample waste; 2. Two-position three-way rotary valve: The advantage of this type of valve is that the channels are independent, ensuring that there is no cross-contamination in each channel. If a channel is abnormal, only the abnormal valve needs to be dealt with. It is equipped with 12 stainless steel three-way valves for on / off switching, providing a high-pressure-resistant sealing structure for the equipment while reducing cross-contamination and optimizing the flow path.

[0003] In rapid solvent extraction (XLE) systems, samples can become quite viscous during operation, making it difficult to purge the sample from the flow path with gas. To address this, a common approach is to increase the purging time to prevent incomplete removal of solution from the flow path. Purging is typically performed after extraction, usually using an inert gas that is introduced into the flow path to remove residual solvent or volatile substances. However, this method has its limitations: if the purging pressure is not adjustable, it can lead to problems. For example, excessively high pressure may damage the sample or equipment; insufficient pressure may result in incomplete purging, leaving residual solvent in the flow path that could affect subsequent analyses. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multi-channel flow path for a rapid solvent extraction instrument.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A multi-channel flow path for a rapid solvent extraction apparatus includes a gas supply flow path, a liquid supply flow path, and several extraction flow paths. Each extraction flow path includes a first pipeline and an upper three-way valve and a first pressure sensor, an extraction unit, sequentially arranged on the first pipeline; a second pipeline and a condenser, a lower three-way valve, and a collection unit, sequentially arranged on the second pipeline; the extraction unit is located between the first pressure sensor and the condenser; the liquid supply flow path is connected to the upper three-way valve pipeline; the gas supply flow path includes a gas supply pipe and a proportional valve and a gas multi-channel diversion module sequentially arranged on the gas supply pipe; the gas multi-channel diversion module is connected to the upper three-way valve pipeline.

[0007] Furthermore, in this utility model, the extraction unit includes an upper sealing seat, a heating unit, and a lower sealing seat arranged in sequence. An extraction tube is provided on the heating unit. The upper sealing seat and the lower sealing seat are respectively used to seal the top and bottom ends of the extraction tube. The liquid in the first pipeline can flow into the extraction tube through the upper sealing seat, and the liquid in the extraction tube can flow into the condenser through the lower sealing seat.

[0008] Furthermore, in this utility model, the liquid supply path includes a liquid supply pipe connected to the upper three-way valve, and a mixing valve, a high-pressure pump, a second pressure sensor, and a liquid multi-channel diversion module sequentially arranged on the liquid supply pipe. The liquid multi-channel diversion module is located between the second pressure sensor and the upper three-way valve.

[0009] Furthermore, in this invention, the aforementioned liquid multi-channel diversion module is also connected to an overpressure protection valve via a pipeline.

[0010] Furthermore, in this utility model, the collection unit includes a collection block and a waste liquid collection bottle, both of which are connected to the lower three-way valve pipeline.

[0011] The beneficial effects of this utility model are:

[0012] This invention provides a multi-channel flow path for a rapid solvent extraction instrument. By adding a proportional valve to the gas supply path, when it is necessary to clean the residual solvent in the extraction flow path, the proportional valve can control the pressure of the gas entering the first pipeline, which makes it easier to purge the sample when it is viscous, thereby solving the problem of incomplete solution discharge. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0014] In the diagram: 1-First pipeline; 2-Upper three-way valve; 3-First pressure sensor; 4-Second pipeline; 5-Condenser; 6-Lower three-way valve; 7-Gas supply pipe; 8-Proportional valve; 9-Gas multi-channel diversion module; 10-Upper sealing seat; 11-Lower sealing seat; 12-Extraction tube; 13-Liquid supply pipe; 14-Mixing valve; 15-High-pressure pump; 16-Second pressure sensor; 17-Liquid multi-channel diversion module; 18-Overpressure protection valve; 19-Collection block; 20-Waste liquid collection bottle. Detailed Implementation

[0015] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] Please see Figure 1 This utility model provides a technical solution:

[0017] A multi-channel flow path for a rapid solvent extraction apparatus includes a gas supply path, a liquid supply path, and several extraction paths. In this embodiment, there are six sets of extraction paths. Each extraction path includes a first pipeline 1 and, sequentially mounted on the first pipeline 1, an upper three-way valve 2, a first pressure sensor 3, an extraction unit, a second pipeline 4 and, sequentially mounted on the second pipeline 4, a condenser 5, a lower three-way valve 6, and a collection unit. The extraction unit is located between the first pressure sensor 3 and the condenser 5. The liquid supply path is connected to the upper three-way valve 2. The gas supply path includes a gas supply pipe 7 and, sequentially mounted on the gas supply pipe 7, a proportional valve 8 and a gas multi-channel diversion module 9. The gas multi-channel diversion module 9 is connected to the upper three-way valve 2. The function of the first pressure sensor 3 is to detect whether the pressure in the extraction path is normal. In this embodiment, the gas multi-channel diversion module 9 has one inlet and six outlets. The inlet is connected to the gas supply pipe 7, and the six outlets are respectively connected to six upper three-way valves 2.

[0018] In this embodiment, the extraction unit includes an upper sealing seat 10, a heating unit (not shown in the figure), and a lower sealing seat 11 installed sequentially. An extraction tube 12 is mounted on the heating unit. The upper sealing seat 10 and the lower sealing seat 11 seal the top and bottom ends of the extraction tube 12, respectively. Liquid in the first pipeline 1 flows into the extraction tube 12 through the upper sealing seat 10, and liquid in the extraction tube 12 flows into the condenser 5 through the lower sealing seat 11. The condenser 5 cools the extracted solution. This sealing method is existing technology and will not be described in detail here.

[0019] In this embodiment, the liquid supply path includes a liquid supply pipe 13 connected to the upper three-way valve 2, and a mixing valve 14, a high-pressure pump 15, a second pressure sensor 16, and a liquid multi-channel diversion module 17 sequentially arranged on the liquid supply pipe 13. The liquid multi-channel diversion module 17 is located between the second pressure sensor 16 and the upper three-way valve 2. The mixing valve 14 has four reagent inlets, and four different reagents can be injected into the mixing valve 14 through the four reagent inlets respectively. The mixing valve 14 then mixes the different reagents. After mixing, the mixture is drawn into the liquid supply pipe 13 by the high-pressure pump 15, and then delivered to the liquid multi-channel diversion module 17. The function of the second pressure sensor 16 is to detect whether the pressure value of each first pressure sensor 3 is normal. In this embodiment, the liquid multi-channel diversion module 17 has one inlet and six outlets. The inlet is connected to the liquid supply pipe 13, and the six outlets are respectively connected to six upper three-way valves 2. The liquid flowing in through the inlet can flow into the six upper three-way valves 2 through the six outlets respectively.

[0020] In this embodiment, the liquid multi-channel diversion module 17 is also connected to an overpressure protection valve 18, which is used to release pressure when the pressure value in the liquid supply path exceeds a preset value.

[0021] In this embodiment, the collection unit includes a collection block 19 and a waste liquid collection bottle 20, both of which are connected to the lower three-way valve 6 via pipeline. The solution extracted from each extraction flow path can flow into the collection block 19 if needed, and into the waste liquid collection bottle 20 if not needed.

[0022] Working principle:

[0023] In this embodiment, the mixing valve 14 can simultaneously input up to four different reagents. In actual use, different reagents are selected according to the situation and then injected into the mixing valve 14 for mixing. The reagents mixed by the mixing valve 14 are drawn into the supply pipe 13 by the high-pressure pump 15, and then delivered to the liquid multi-channel diversion module 17. Here, the second pressure sensor 16 can determine the total pressure value and the pressure values ​​of each branch (the pressure values ​​of the six extraction flow paths). The mixed solution is diverted to six outlets by the liquid multi-channel diversion block, and then passes through six upper three-way valves 2, through the pressure sensors of each branch, through the upper sealing seat 10, the extraction tube 12, the lower sealing seat 11, the condenser 5, and finally to the lower three-way valve 6.

[0024] For any extraction path, during extraction, the lower three-way valve 6 is closed first, then the upper three-way valve 2 is switched to the solution inlet. The high-pressure pump 15 continuously pumps the solution from the mixing valve 14, filling the supply pipe 13, and then injecting it into the extraction tube 12. When the supply pipe 13, the first pipe 1, and the second pipe 4 are filled with solvent, the solvent pressure in the pipes begins to rise. During extraction in the extraction tube 12, the heating unit heats the extraction tube 12, causing the solvent in the extraction tube 12 to vaporize and increase the pressure. When the required pressure value is reached, the upper three-way valve 2 closes, and at this time, the sample begins to extract the reagent under the influence of temperature. After extraction, the lower three-way valve 6 opens, and the solvent has two destinations: one is to the collection block 19, and the other is to the waste liquid collection bottle 20.

[0025] When reagents cannot be flushed out of the pipelines (mainly referring to the first pipeline 1 and the second pipeline 4) (no pressure difference between inside and outside), the upper three-way valve 2 switches to the gas inlet. Gas first enters the proportional valve 8, which then allows the gas to flow at a certain pressure into the gas supply pipe 7, the first pipeline 1, and the second pipeline 4 sequentially. The pressurized gas flowing through these pipelines flushes out the solution. The function of the proportional valve 8 is to control the pressure of the gas entering the first pipeline 1, making it easier to purge samples with high viscosity and thus solving the problem of incomplete solution discharge.

[0026] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A multi-channel flow path for a rapid solvent extraction apparatus, characterized in that: It includes a gas supply path, a liquid supply path, and several extraction paths. Each extraction path includes a first pipeline (1) and an upper three-way valve (2) and a first pressure sensor (3) sequentially arranged on the first pipeline (1), an extraction unit, a second pipeline (4) and a condenser (5), a lower three-way valve (6), and a collection unit sequentially arranged on the second pipeline (4). The extraction unit is located between the first pressure sensor (3) and the condenser (5). The liquid supply path is connected to the upper three-way valve (2) pipeline. The gas supply path includes a gas supply pipe (7) and a proportional valve (8) and a gas multi-channel diversion module (9) sequentially arranged on the gas supply pipe (7). The gas multi-channel diversion module (9) is connected to the upper three-way valve (2) pipeline.

2. The multi-channel flow path of a rapid solvent extraction apparatus according to claim 1, characterized in that: The extraction unit includes an upper sealing seat (10), a heating unit and a lower sealing seat (11) arranged in sequence. An extraction tube (12) is provided on the heating unit. The upper sealing seat (10) and the lower sealing seat (11) are used to seal the top and bottom ends of the extraction tube (12) respectively. The liquid in the first pipeline (1) can flow into the extraction tube (12) through the upper sealing seat (10), and the liquid in the extraction tube (12) can flow into the condenser (5) through the lower sealing seat (11).

3. The multi-channel flow path of a rapid solvent extraction apparatus according to claim 1 or 2, characterized in that: The liquid supply path includes a liquid supply pipe (13) connected to the upper three-way valve (2), and a mixing valve (14), a high-pressure pump (15), a second pressure sensor (16), and a liquid multi-channel diversion module (17) sequentially arranged on the liquid supply pipe (13). The liquid multi-channel diversion module (17) is located between the second pressure sensor (16) and the upper three-way valve (2).

4. The multi-channel flow path of a rapid solvent extraction apparatus according to claim 3, characterized in that: The liquid multi-channel diversion module (17) is also connected to an overpressure protection valve (18) via pipeline.

5. The multi-channel flow path of a rapid solvent extraction apparatus according to claim 1, characterized in that: The collection unit includes a collection block (19) and a waste liquid collection bottle (20), both of which are connected to the pipeline of the lower three-way valve (6).

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