Dropping graduated cylinder for use in chemical laboratory

Abstract

A dropping graduated cylinder for use in a chemical laboratory, comprising a cylinder body (1). An inlet (2) is formed at the top of the cylinder body (1); a flat bottom (3) is arranged at the bottom of the cylinder body (1); a liquid outlet nozzle (4) is arranged beneath the flat bottom (3); the cylinder body (1) is provided with graduations (5), and the graduations (5) are arranged upward starting from the bottom of an inner wall of the cylinder body (1); and the liquid outlet nozzle (4) is used for being sleeved on a liquid delivery hose (6). The liquid delivery hose (6) is not subject to compression or friction, so that the entire liquid delivery hose (6) can be made of a non-elastic polytetrafluoroethylene hose, except for the connections to the liquid outlet nozzle (4) and a reactor bottle where short sections of the elastic liquid delivery hose are required for sleeving, thereby greatly improving the service life and safety of the liquid delivery hose (6). The graduations (5) on an outer wall of the cylinder body (1) allow for quick reading of liquid levels, thereby facilitating the setting of the dropping speed.

Description

A dropping graduated cylinder for use in chemical laboratories Technical Field

[0001] This invention relates to a graduated cylinder for use in chemical laboratories, belonging to the technical field of chemical experimental dropper tools. Background Technology

[0002] In a chemistry laboratory, the automated addition of liquid chemical reagents is an essential operation. Existing technologies typically employ peristaltic pumps or syringe pumps for automated liquid reagent dispensing. However, peristaltic pumps have several drawbacks: 1. The flexible tubing is prone to breakage due to the high-frequency compression from the rollers, resulting in a short lifespan, especially when dispensing highly corrosive solutions. A breakage of the flexible tubing can easily lead to experimental accidents. 2. As the tubing wears, corrodes, and swells, its elasticity and inner diameter change, leading to poor dispensing accuracy, typically with an error of 2%. 3. The flow rate range is narrow, requiring different peristaltic pumps for different dispensing flow rates. 4. Multi-channel dispensing requires multiple peristaltic pumps, and consistency across channels is poor. 5. They are cumbersome to use, requiring the conversion of the liquid reagent mass to volume and pre-calibration of the dispensing rate before dispensing, and frequent calibration during the dispensing process. 6. They are unsuitable for long-term continuous dispensing; the tubing's lifespan in solvents is only one to two hundred hours, and the syringe pump's sealing ring easily swells in solvents, significantly increasing friction with the tubing wall, making it difficult to push, and the sealing ring is easily damaged. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a simple, uniform, accurate, easy-to-operate, and long-lasting dropping graduated cylinder for use in chemical laboratories.

[0004] The present invention provides a technical solution for a dropper cylinder for use in a chemical laboratory: it includes a cylinder body, an inlet at the top of the cylinder body, a flat bottom at the bottom of the cylinder body, and a dispensing nozzle at the flat bottom.

[0005] Furthermore, the cylinder body is provided with length scale lines, which are set upwards from the bottom of the inner wall of the cylinder body.

[0006] Furthermore, the dispensing nozzle is used to connect to the infusion tubing.

[0007] The beneficial effects of the present invention, a drip graduated cylinder for chemical laboratories, are as follows: First, although the infusion tubing is also swollen and corroded by solvents, it is not subjected to high-frequency compression by rollers like the tubing of a peristaltic pump, nor is it subjected to strong friction between the sealing ring and the tube wall like the sealing ring of a syringe pump. Therefore, it has a longer service life and higher dripping accuracy.

[0008] Second, since the infusion tubing is not subjected to compression or friction, the entire infusion tubing, except for the small section of elastic infusion tubing needed to be connected to the outlet and reaction bottle, can use non-elastic PTFE tubing, which greatly improves the service life and safety of the infusion tubing.

[0009] Third, the length scale lines on the outer wall of the cylinder allow for quick reading of the liquid level and convenient setting of the dripping speed. Attached Figure Description

[0010] Figure 1 is a three-dimensional schematic diagram of a dropping graduated cylinder for use in a chemical laboratory according to the present invention.

[0011] Figure 2 is a schematic diagram of the combined structure of a dropper cylinder, lifting device, infusion hose, glass dropper head, and reaction flask for use in a chemical laboratory according to the present invention. Detailed Implementation

[0012] This invention relates to a dropper cylinder for use in a chemical laboratory, as shown in Figures 1 and 2, comprising a cylinder body 1, an inlet 2 at the top of the cylinder body 1, a flat bottom 3 at the bottom of the cylinder body 1, and a liquid outlet 4 at the bottom of the flat bottom 3.

[0013] Furthermore, the cylinder body 1 is provided with a length scale line 5, which is set upward from the bottom of the inner wall of the cylinder body 1.

[0014] Furthermore, the dispensing nozzle 4 is used to connect to the infusion tubing 6.

[0015] This invention discloses a dropping graduated cylinder for use in a chemical laboratory. Before dropping liquid using the dropping graduated cylinder of this design (as shown in Figure 2), the empty cylinder body 1 is first suspended on a lifting device 10 (the lifting device 10 can be an electric screw slide lifting structure, an electric gear rack slide lifting structure, a linear motor slide lifting structure, an electric synchronous belt linear slide lifting structure, or an electric screw lifting structure; the specific structures are all existing technologies and can be directly purchased from the market). The lifting device 10 drives the cylinder body 1 to descend to the lowest point, and the liquid outlet 4 at the bottom of the cylinder body 1 is connected to the infusion tubing 6; then a reaction flask is taken... 100. Insert a glass dropper 11 into the feed inlet 101 of the reaction flask 100. A thin glass tube 12 is provided on the glass dropper 11. One end of the thin glass tube 12 inside the dropper is the drop outlet 14, and the other end outside the dropper is the inlet 13. The inlet 13 is connected to one end of the infusion tubing 6. The inlet 13 is not higher than the drop outlet 14. At this time, the liquid reagent to be added is added to the cylinder 1. When the liquid is being added, the cylinder 1 is lifted by the lifting device 10. When it is observed that the liquid is about to drip from the drop outlet 14 inside the glass dropper 11, the lifting device 10 controls the cylinder 1 to stop at that position. At this time, the liquid level inside the cylinder 1 is level with the dripping orifice 14 of the glass dropper head 11. If the cylinder 1 is made of transparent material, the liquid level height H inside the cylinder 1 can be directly read through the length scale line 5 set on the side wall of the cylinder 1. If the cylinder 1 is made of opaque material, after adding liquid reagent to the cylinder 1, the flexible tube 6 is placed close to the length scale line 5 set on the side wall of the cylinder 1, and the height H can be read from the liquid level indicator in the transparent or semi-transparent flexible tube. Input the liquid level height H into the lifting device 10 (the lifting device 10 is equipped with a controller and a control panel, through which the liquid level height and dripping time are input), and simultaneously input the planned dripping time T, and the dripping can begin. The lifting device 10 calculates the speed based on the input height H and time T, and lifts the cylinder 1 at this speed. When the liquid level inside the cylinder is slightly higher than the dripping port 14 of the glass dropper head 11, due to gravity, the liquid reagent inside the cylinder 1 flows from the infusion tubing 6 to the inlet 13 of the glass dropper head 11, and then drips out from the dripping port 14 into the reaction bottle 100. After running for the set time T, the height to which the lifting device 10 lifts the cylinder 1 is the liquid level height H inside the cylinder 1 input at the set time. At this time, the bottom surface inside the cylinder 1 is level with the dripping port 14 of the glass dropper head 11, and all the liquid inside the cylinder 1 has flowed out into the reaction bottle 100, and the dripping is completed.

[0016] This solution provides a drip graduated cylinder for chemical laboratories with the following advantages: 1. Although the infusion tubing 6 is also susceptible to solvent swelling and corrosion, it is not subjected to the high-frequency compression of rollers like the tubing of a peristaltic pump, nor to the strong friction between the sealing ring and the tube wall like the sealing ring of a syringe pump. Therefore, it has a longer service life and higher dripping accuracy. 2. Since the infusion tubing 6 is not subjected to compression or friction, the entire infusion tubing, except for the small section of elastic tubing required for connection with the outlet 4 and the reaction flask 100, can use non-elastic PTFE tubing, greatly improving the service life and safety of the infusion tubing. 3. The length scale 5 on the outer wall of the cylinder body 1 allows for quick reading of the liquid level, convenient setting of the dripping speed, and easy operation.

Claims

1. A graduated cylinder for use in a chemical laboratory, characterized in that: It includes a cylinder body (1), an inlet (2) is provided at the top of the cylinder body (1), a flat bottom (3) is provided at the bottom of the cylinder body (1), and a liquid outlet (4) is provided under the flat bottom (3).

2. A graduated cylinder for use in a chemical laboratory as described in claim 1, characterized in that: The cylinder body (1) is provided with a length scale line (5), which is set upward from the bottom of the inner wall of the cylinder body (1).

3. The graduated cylinder for a chemical laboratory according to claim 1, characterized in that, The dispensing nozzle (4) is used to connect to the infusion tubing (6).

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