Liquid transfer type KD concentration pipe fitting

Abstract

The utility model provides a liquid transfer type KD (Ketene Dimer) concentration pipe fitting, which relates to the technical field of environment detection devices, and comprises a concentration pipe, a transfer bottle, a fixing piece and a sealing cover, the concentration pipe comprises a spherical cavity and a concentration pipe cavity which are integrally connected from top to bottom, the top of the spherical cavity is provided with a connecting port, the bottom of the concentration pipe cavity is provided with a liquid outlet, and the connecting port is connected with the liquid outlet. A mounting opening and an external thread are arranged at the top of the transfer bottle, the mounting opening is detachably connected with a liquid outlet in the bottom of the concentration pipe cavity through a fixing piece, and the transfer bottle is connected with a sealing cover through the external thread. The problems that target object loss is easily caused in the transferring process, the sample recovery rate is affected, cleaning is inconvenient, and sample cross contamination is easily caused are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental detection devices, in particular to a liquid transfer type KD concentrating pipe fitting. Background Art

[0002] In the pretreatment process of organic samples for environmental testing, concentration is a key step. The quality of the concentration process is related to whether the recovery rate meets the requirements. At present, the more commonly used concentration methods are rotary evaporation concentration, nitrogen blowing concentration and KD concentration. Among them: the final fixed volume of rotary evaporation concentration is difficult to control, and the concentrated samples need to be frequently replaced, which is not suitable for batch sample concentration; nitrogen blowing concentration has a large loss for compounds with low boiling points and instability. At the same time, due to the heat absorption of solvent volatilization, water droplets will form on the inner wall of the nitrogen blowing tube; KD concentration can achieve large volume sample concentration, with high recovery rate and small loss. It is widely used in the pre-concentration treatment of semi-volatile organic extracts of environmental samples such as water, soil, and gas.

[0003] The KD concentration device is a set of assembled glassware, consisting of a concentration tube, a connecting bottle (pear-shaped bottle), a splitter column, a condenser, a suction bottle and a pressure reducer. The assembly method is: the concentration tube is connected to the pear-shaped bottle, then to the splitter column, and then to the condenser. The bottom of the condenser is connected to the suction bottle (to collect the condensed solvent). One end of the suction bottle can be connected to a pressure reducer. The interface of each glass device is designed to be ground-mouth sealed and clamped with a standard clamp after connection. Its working principle is: the extraction solution to be concentrated is added to the pear-shaped bottle, and atmospheric pressure or reduced pressure distillation is used. The organic solvent in the extract passes through the splitter column, and after partial condensation, it becomes liquid and continuously refluxes and flushes, which can effectively reduce the loss of the target object. The remaining evaporated solvent is fractionated and condensed and collected in the suction bottle. The target compound to be detected is basically not evaporated and retained in the pear-shaped bottle, and then concentrated and gathered in the graduated concentration tube to achieve the purpose of concentration. KD concentration device is widely used due to its simple structure and low cost, especially in the detection of semi-volatile organic compounds in water quality and soil. Since most target compounds are not highly heat-sensitive and the extractants used (dichloromethane, acetone) have low boiling points, the use of KD device is efficient and more applicable.

[0004] However, the traditional KD concentrator is an integrated design with a closed bottom structure. When transferring the concentrate, a pipette device (such as a Pasteur pipette) is required. During the transfer process, not only will the target compound remain at the bottom of the inner wall of the concentrator, but the transfer process is also prone to target compound loss, affecting the sample recovery rate. In addition, the traditional structure of the concentrator is not easy to clean and is prone to cross-contamination of samples. Therefore, the present application proposes a liquid transfer type KD concentrator fitting. Utility Model Content

[0005] In order to overcome the problems in the background technology, the utility model provides a liquid transfer type KD concentrator fitting, which solves the problems that the bottom of the traditional KD concentrator tube is a closed structure, the target compound will remain on the inner wall and bottom of the concentrator tube, the transfer process is likely to cause target loss, affecting the sample recovery rate, and it is not easy to clean and easily cause sample cross contamination.

[0006] A liquid transfer type KD concentrating pipe fitting comprises a concentrating tube, a transfer bottle, a fixing and a sealing cover. The concentrating tube comprises a spherical cavity and a concentrating tube cavity which are integrally connected from top to bottom. A connecting port is provided at the top of the spherical cavity, and a liquid outlet is provided at the bottom of the concentrating tube cavity. A mounting port and an external thread are provided at the top of the transfer bottle. The mounting port is detachably connected to the liquid outlet at the bottom of the concentrating tube cavity through a fixing, and the transfer bottle is connected to the sealing cover through an external thread.

[0007] Furthermore, a ground-mouth plug section is provided on the outer wall of the liquid outlet at the bottom of the concentrating tube cavity, and the inner wall of the installation port of the transfer bottle is a rough ground mouth that matches the ground-mouth plug section of the concentrating tube cavity.

[0008] Furthermore, the fixing piece is a standard clamp.

[0009] Furthermore, the bottom end of the concentrating tube cavity is closed, the liquid outlet is opened on the side of the bottom end of the concentrating tube cavity, and a pipetting port connecting the liquid outlet and the bottle cavity is opened on the inner wall of the installation port.

[0010] Furthermore, a threaded section cooperating with the sealing cover is arranged on the outer wall of the bottom of the transfer bottle.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The present application provides a liquid outlet at the bottom of the concentrating tube cavity, which allows for convenient and thorough rinsing after concentration is completed, without any residue on the tube wall and bottom. A transfer bottle is also provided in conjunction with the liquid outlet, which allows for direct volume transfer of the concentrated liquid after rinsing, thereby solving the problem of target compound residues on the inner wall and bottom of a traditional KD concentrating tube, the easy loss of the target object during the transfer process, and the impact on sample recovery, as well as the inconvenience of cleaning and the easy occurrence of sample cross-contamination. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for use in describing the embodiments are described.

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the installation structure of the utility model;

[0016] Figure 3It is a schematic diagram of the internal structure of the utility model.

[0017] 1-concentration tube, 11-connection port, 12-spherical cavity, 13-concentration tube cavity, 14-liquid outlet, 15-ground plug section, 2-transfer bottle, 21-installation port, 22-external thread, 23-pipette port, 3-fixing part, 4-sealing cover. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to facilitate understanding by technicians.

[0019] The utility model discloses a liquid transfer type KD concentrating pipe fitting, see Figure 1-3 A liquid transfer type KD concentrating pipe fitting comprises a concentrating tube 1, a transfer bottle 2, a fixing part 3 and a sealing cover 4. The concentrating tube 1 comprises a spherical cavity 12 and a concentrating tube cavity 13 which are integrally connected from top to bottom. A connecting port 11 is arranged at the top of the spherical cavity 12, and a liquid outlet 14 is arranged at the bottom of the concentrating tube cavity 13. A mounting port 21 and an external thread 22 are arranged at the top of the transfer bottle 2. The mounting port 21 is detachably connected to the liquid outlet 14 at the bottom of the concentrating tube cavity 13 through the fixing part 3. The transfer bottle 2 is connected to the sealing cover 4 through the external thread 22.

[0020] The extraction solution to be concentrated can be added to the transfer bottle 2 and connected to the concentration tube 1 through the fixing part 3 for distillation. The target compound to be detected remains in the concentration tube cavity 13. After the extraction solvent reaches the boiling point, part of it refluxes through the spherical cavity 12, and the other part enters the container connected to the connection port 11 through the connection port 11 for collection and fractionation. After the concentration is completed, the liquid outlet 14 at the bottom of the concentration tube 1 is convenient for thoroughly rinsing the tube cavity to avoid residue. The rinsing liquid enters the transfer bottle 2 through the liquid outlet 14 to reduce the loss of the target object and effectively improve the recovery rate. A constant volume scale is provided on the transfer bottle 2, which is convenient for removing the transfer bottle 2 for constant volume after rinsing. The sealing cover 4 is convenient for closing the installation port 21 and directly testing on the machine. The improved concentration tube 1 is a hollow structure with openings at both ends, which is convenient for cleaning. The transfer bottle 2 is convenient for connecting and replacing with the concentration tube 1, which can avoid cross contamination and can be widely used in pre-concentration treatment of semi-volatile organic pollutants in environmental samples such as water quality, soil, and gas.

[0021] See also Figure 1-3 A ground-mouth plug section 15 is provided on the outer wall of the liquid outlet 14 at the bottom of the concentrating tube cavity 13, and the inner wall of the installation port 21 of the transfer bottle is a rough ground mouth that cooperates with the ground-mouth plug section 15 of the concentrating tube cavity 13 to facilitate sealing connection and avoid leakage.

[0022] See also Figure 1-3 The fixing member 3 is a standard-mouth clamp, which facilitates the stable fixation of the ground-mouth plug section 15 of the concentrator tube 1 and the transfer bottle 2.

[0023] See also Figure 1-3 The bottom end of the concentrating tube cavity 13 is closed, and the liquid outlet 14 is opened on the side of the bottom end of the concentrating tube cavity 13. A pipetting port 23 connecting the liquid outlet 14 and the bottle cavity is opened on the inner wall of the installation port 21. The liquid outlet 14 can be controlled to fit with the inner wall of the installation port 21 or to be connected with the pipetting port 23 to control the concentrated liquid to stay in the concentrating tube cavity 13 or enter the transfer bottle 2, so that the extract to be concentrated can be distilled and concentrated in the concentrating tube cavity 13 and then enter the transfer bottle 2, avoiding the interference of the transfer bottle 2 on the distillation.

[0024] See also Figure 1-3 A threaded section cooperating with the sealing cover 4 is arranged on the outer wall at the bottom of the transfer bottle 2, so as to facilitate the storage of the sealing cover 4 during the concentration process and avoid the sealing cover 4 being lost due to improper storage.

[0025] Working process:

[0026] Connect the ground plug section 15 of the concentrator tube 1 to the mounting port 21 of the transfer bottle 2, so that the liquid outlet 14 is fitted with the inner wall of the mounting port 21 for sealing, and fixed by the fixing part 3, install the sealing cover 4 at the bottom of the transfer bottle, add the extractant to be concentrated into the concentrator tube 1, connect the connecting port to the pear-shaped bottle and other concentrating equipment, and then distill and concentrate. After the concentration is completed, remove the concentrator tube 1, and turn the liquid outlet to the connecting pipetting port 23. After the concentrated liquid enters the transfer bottle, use a Pasteur pipette to absorb the extraction solvent (such as dichloromethane) to rinse the concentrator tube 1 from top to bottom, and the rinsing liquid enters the transfer bottle 2. After the rinsing is completed, remove the transfer bottle 2, and cover it with the sealing cover 4 after the volume is fixed and put it on the machine for testing.

[0027] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A liquid transfer type KD concentrating pipe, characterized in that: The invention comprises a concentrating tube (1), a transfer bottle (2), a fixing member (3) and a sealing cover (4); the concentrating tube (1) comprises, from top to bottom, a spherical cavity (12) and a concentrating tube cavity (13) which are integrally connected; the top of the spherical cavity (12) is provided with a connecting port (11); the bottom of the concentrating tube cavity (13) is provided with a liquid outlet (14); the top of the transfer bottle (2) is provided with a mounting port (21) and an external thread (22); the mounting port (21) is detachably connected to the liquid outlet (14) at the bottom of the concentrating tube cavity (13) via the fixing member (3); and the transfer bottle (2) is connected to the sealing cover (4) via the external thread (22).

2. The liquid transfer type KD concentrating pipe according to claim 1, characterized in that: A ground-mouth plug section (15) is provided on the outer wall of the liquid outlet (14) at the bottom of the concentrating tube cavity (13), and the inner wall of the installation opening (21) of the transfer bottle is a rough ground mouth that matches the ground-mouth plug section (15) of the concentrating tube cavity (13).

3. The liquid transfer type KD concentrating pipe according to claim 1, characterized in that: The fixing member (3) is a standard clamp.

4. The liquid transfer type KD concentrating pipe according to claim 1, characterized in that: The bottom end of the concentrating tube cavity (13) is closed, the liquid outlet (14) is provided on the side of the bottom end of the concentrating tube cavity (13), and a pipetting port (23) connecting the liquid outlet (14) and the bottle cavity is provided on the inner wall of the installation port (21).

5. The liquid transfer type KD concentrating pipe according to claim 1, characterized in that: A threaded section cooperating with the sealing cover (4) is provided on the outer wall of the bottom of the transfer bottle (2).

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