Glass drip tip for use in chemical laboratory

Abstract

A glass drip tip for use in a chemical laboratory, the drip tip comprising a glass cylinder, wherein 1-3 thin glass tubes are provided on a side wall of the glass cylinder; the end of each thin glass tube that is located outside the glass cylinder is a liquid inlet, and the end of each thin glass tube that is located inside the glass cylinder is a drip outlet; the glass cylinder has an upper opening and a lower opening; the upper opening of the glass cylinder is provided with a sealing block, or is provided with an upper grind joint; and the lower opening of the glass cylinder is provided with a lower connecting portion. Regardless of whether a feed port of a reaction flask is straight or angled, once the glass drip tip is inserted and then rotated, the liquid inlets will never be higher than the drip outlets, such that the drip outlets drip a liquid reagent at a uniform rate without generating a siphon effect during dripping; the design of the glass drip tip with different numbers of drip tubes meets the requirements for single-way or multi-way dripping; and the glass drip tip is stackable and insertable to meet the requirements for multi-way dripping.

Description

A glass dropper for use in chemical laboratories Technical Field

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

[0002] In chemistry labs, the automated addition of liquid chemical reagents is an essential operation. Manual addition lacks precision, and the rate of addition is difficult to control. Automated addition typically uses a syringe pump or peristaltic pump. Because the pump pressurizes the liquid, a simple homemade dropping head can be used by drilling a hole in the center of a rubber stopper and inserting a short glass tube. The upper end of the glass tube in the homemade dropping head is the inlet, which connects to the outlet of the peristaltic pump or syringe pump. The lower end of the glass tube is the dropping outlet. The rubber stopper of the dropping head is inserted into the feed inlet of the reaction flask, and the liquid can be dispensed normally. However, peristaltic pumps have several disadvantages: First, the flexible tubing is prone to breakage due to the high-frequency compression from the rollers, resulting in a short service life. This is especially true when dripping highly corrosive solutions, where a breakage of the tubing can easily cause experimental accidents. Second, as the tubing wears, corrodes, and swells, its elasticity and inner diameter change, leading to poor dripping accuracy, typically with an error of 2%. Third, the flow rate range is narrow, requiring different peristaltic pumps with different flow rates. Fourth, multi-channel dripping requires a multi-channel peristaltic pump, and consistency across channels is poor. Fifth, they are cumbersome to use; the mass of the liquid reagent to be dripped must be converted to volume before dripping, and the dripping rate must be pre-calibrated. Frequent calibration is also required during the dripping process. Sixth, they are not suitable for continuous dripping over long periods. The tubing's lifespan in solvents is only one to two hundred hours, and the 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.

[0003] To overcome the shortcomings of peristaltic pumps and syringe pumps, a liquid dripping scheme has been designed, as shown in Figure 11. A lifting device 1' (such as an electric screw-type sliding table lifting structure, an electric gear and rack sliding table lifting structure, or a linear motor sliding table lifting structure, etc.) has a suspension arm 2' on it. A liquid storage cylinder 3' is suspended on the suspension arm 2'. The outlet 4' at the bottom of the liquid storage cylinder 3' is connected to a dripping head on the inlet 101' of the reaction flask 100' via a hose 5'. When the lifting device raises the dripping cylinder 3' at a set speed, the liquid reagent should flow from the liquid storage cylinder to the dripping head and then drip into the reaction flask at the set speed under the influence of gravity.

[0004] If a regular drip head is installed at the feed inlet 101' of reaction flask 100', a short glass tube 7' is inserted into the rubber stopper 6' as a drip head. The upper opening of the short glass tube 7' is the inlet 8', and the lower opening is the drip outlet 9'. The inlet 8' is higher than the drip outlet 9'. One end of a flexible tube 5' is connected to the outlet 4' of the liquid storage cylinder 3', and the other end is connected to the inlet 8' of the short glass tube 7' in the rubber stopper 6'. The lifting device 1' drives the suspension arm 2' and the liquid storage cylinder 3' to slowly rise. When the liquid level in the liquid storage cylinder 3' is higher than the highest point of the flexible tube 5' ( The liquid reagent in the measuring cylinder 3′ (height A) flows through the hose 5′ to the inlet 8′, and then from the inlet 8′ to the dripping port 9′. Due to siphon action, the liquid reagent rapidly flows out of the dripping port 9′ until the liquid level in the measuring cylinder 3′ drops rapidly from height A to height B, level with the dripping port 9′. Then, as the dripping device 1′ is slowly raised, the liquid reagent in the measuring cylinder 3′ flows out of the dripping port 9′ under gravity due to the slight height difference between the liquid level and the dripping port 9′, and drips into the reaction flask. With this dripping head structure, due to siphon action at the beginning of the dripping stage, the liquid reagent in the measuring cylinder 3′ flows out rapidly and uncontrollably from height A to height B, failing to achieve the goal of dripping at a set speed throughout the entire process. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a glass dropper for chemical laboratories that has a simple structure, provides uniform droplet flow, and does not produce a siphon effect.

[0006] The technical solution of the present invention for a glass dropper for a chemical laboratory is as follows: it includes a glass cylinder, and the side wall of the glass cylinder is provided with 1-3 thin glass tubes. The end of the thin glass tube outside the glass cylinder is the liquid inlet, and the end of the thin glass tube inside the glass cylinder is the dropper. The glass cylinder has an upper opening and a lower opening. The upper opening of the glass cylinder is provided with a sealing baffle or an upper grinding interface, and the lower opening of the glass cylinder is provided with a lower connecting part.

[0007] Furthermore, the lower connecting part is a lower grinding interface.

[0008] Furthermore, the lower connecting part is a lower grinding interface, and a dripping tube is provided inside the lower grinding interface. The upper opening of the dripping tube is connected to the lower opening of the glass tube.

[0009] Furthermore, the lower connecting part is a lower grinding interface, and a drip tube is provided at the lower part of the lower grinding interface.

[0010] Furthermore, the lower connecting part is a drip tube.

[0011] Furthermore, the glass tube is cylindrical or drum-shaped.

[0012] The beneficial effects of the glass dropper for chemical laboratories of the present invention are:

[0013] 1. Regardless of whether the feed inlet of the reaction flask is straight or angled, the inlet will never be higher than the dropper opening after the glass dropper is inserted and rotated, and no siphon effect will be generated during the dropping process.

[0014] II. The glass dropper head is designed with different numbers of dropper tubes to meet the needs of single or multiple dropper applications; the glass dropper heads can be stacked and nested to meet the needs of even more dropper applications.

[0015] III. The lower connecting part has multiple designs to meet different experimental needs:

[0016] 1. The bottom grinding interface design facilitates connection with standard grinding interface reaction flasks and allows for the stacking of multiple glass dropping heads to meet multi-channel dropping requirements. The large bottom opening also makes it easy to clean.

[0017] 2. A dropper is installed below the grinding interface to prevent liquid reagents from flowing down the reaction flask wall, and the droplet status is more clearly and intuitively observed.

[0018] 3. The drip tube design allows for connection of non-standard ground glass reaction flasks via rubber stoppers.

[0019] 4. The glass dropper is designed with a ground interface for easy connection to other glass instruments or stacking of multiple glass droppers; the glass dropper is also designed with an upper sealing baffle, which allows for clearer observation of the dropper's state.

[0020] Fifth, the drum-shaped design of the glass tube provides a larger observation surface and a greater separation distance between multiple droplets, allowing for clearer observation of the dripping situation at each droplet; a larger space can be left in the center of the glass tube to facilitate the insertion of other glass instruments into the dropper head. Attached Figure Description

[0021] Figure 1 is a perspective view of an embodiment 1 of the glass dropper for a chemical laboratory according to the present invention;

[0022] Figure 2 is a cross-sectional schematic diagram of an embodiment 1 of the glass dropper for a chemical laboratory according to the present invention;

[0023] Figure 3 is a perspective view of Embodiment 2 of the glass dropper for a chemical laboratory according to the present invention;

[0024] Figure 4 is a perspective view of Embodiment 3 of the glass dropper for a chemical laboratory according to the present invention;

[0025] Figure 5 is a perspective view of Embodiment 4 of the glass dropper for a chemical laboratory according to the present invention;

[0026] Figure 6 is a perspective view of Embodiment 5 of the glass dropper for a chemical laboratory according to the present invention;

[0027] Figure 7 is a perspective view of Embodiment 6 of the present invention, which is a glass dropper for use in a chemical laboratory.

[0028] Figure 8 is a three-dimensional schematic diagram of the decomposition state of a glass dropper and reaction flask for use in a chemical laboratory according to the present invention.

[0029] Figure 9 is a schematic diagram of the decomposition state of three types of glass droppers and reaction flasks;

[0030] Figure 10 is a schematic diagram of the structure of a glass dropper for a chemical laboratory according to the present invention, in conjunction with a reaction flask, lifting device, liquid storage cylinder, and hose.

[0031] Figure 11 is a schematic diagram of the structure of an existing ordinary self-made dropper in conjunction with a reaction flask, lifting device, liquid storage cylinder, and tubing. Detailed Implementation

[0032] This invention relates to a glass dropper for use in a chemical laboratory, as shown in Figures 1-7. It includes a glass tube 1, and 1-3 thin glass tubes 2 are provided on the side wall of the glass tube 1. The end of the thin glass tube 2 outside the glass tube 1 is a liquid inlet 3, and the end of the thin glass tube 2 inside the glass tube is a dropper 4. The glass tube 1 has an upper opening and a lower opening. The upper opening of the glass tube 1 is provided with a sealing baffle 5 or an upper grinding interface 6, and the lower opening of the glass tube 1 is provided with a lower connecting part.

[0033] Furthermore, the lower connecting part is a lower grinding interface 7. This design facilitates the insertion and connection with reaction flasks using standard grinding interfaces, and also allows for the stacking of multiple glass dropping heads to meet multi-channel dropping requirements. In addition, the lower opening of the lower grinding interface 7 is large and easy to clean.

[0034] Furthermore, the lower connecting part is a lower grinding interface 7, and a dropping tube 8 is provided inside the lower grinding interface 7. The upper opening of the dropping tube 8 is connected to the lower opening of the glass tube 1. This design can prevent liquid reagents from flowing down the reaction bottle wall, and the dropping state can be observed more clearly and intuitively.

[0035] Furthermore, the lower connecting part is a lower grinding interface 7, and a dropping tube 8 is provided at the lower part of the lower grinding interface 7. This design can prevent liquid reagents from flowing down the reaction bottle wall, and the dropping state can be observed more clearly and intuitively.

[0036] Furthermore, the lower connecting part is a dropper 8. This design allows the dropper head to be plugged into reaction flasks with non-standard ground joints via a rubber stopper.

[0037] Furthermore, the glass tube 1 is cylindrical or drum-shaped. The drum-shaped design of the glass tube 1 provides a larger observation surface and a greater separation distance between the multiple droplets, allowing for clearer observation of the droplet flow; a larger space can be left in the center of the glass tube to facilitate the insertion of other glass instruments into the droplet head.

[0038] This invention discloses a glass dropper for use in a chemical laboratory. As shown in Figure 10, the lower ground interface 7 of the glass dropper is inserted into the feed inlet 101 of a reaction flask 100. The feed inlet 101 can be straight or angled. If it is a straight-mouthed reaction flask, the inlet 3 of the thin glass tube 2 will naturally not be higher than the dropper 4. If it is an angled reaction flask, the lower connecting part of the glass dropper is inserted into the feed inlet 101. The glass dropper needs to be rotated to a suitable angle so that the inlet 3 of the thin glass tube 2 is not higher than the dropper 4. Then, a lifting device 12 is used (the lifting device 12 can be an electric screw slide lifting structure or an electric gear rack slide). The lifting device 12 can be equipped with a lifting structure, a linear motor sliding table lifting structure, an electric synchronous belt linear sliding table lifting structure, or an electric screw lifting structure (the specific structures of which are all existing technologies and can be directly purchased from the market). A suspension arm 13 is set on the lifting device 12, and a liquid storage cylinder 9 is hung on the suspension arm 13. The liquid storage cylinder 9 has a liquid outlet 10 at its bottom. The liquid outlet 10 is connected to the liquid inlet 3 of the glass dropper on the reaction flask 100 by a hose 11. The lower grinding interface 7 of the glass dropper is inserted into the feed inlet 101 of the reaction flask 100. The upper grinding interface 6 of the glass cylinder 1 can be connected to other glass instruments, or the upper grinding interface 6 can be sealed with a grinding plug. When performing the dripping, first lower the suspension arm 13 of the lifting device 12 to its lowest point, hang the empty liquid storage cylinder 9 on the suspension arm 13, and add the liquid reagent to be dripped into the liquid storage cylinder 9. At this time, the lifting device 12 drives the suspension arm 13 and the liquid storage cylinder 9 to rise. When it is observed that the liquid is about to drip from the dripping nozzle 4 of the glass dripping head, the lifting device 12 controls the suspension arm 13 and the liquid storage cylinder 9 to stop at this position. At this time, the liquid level in the liquid storage cylinder 9 is level with the dripping nozzle 4 of the glass dripping head. Measure the liquid level height in the liquid storage cylinder 9 and input the measured liquid level height into the lifting device 12 (the lifting device 12 is equipped with a controller and control panel, through which the liquid level height and dripping time are input). At the same time, input the planned dripping time, and the dripping can begin. The lifting device 12 calculates the speed based on the input height and time, and raises the suspension arm 13 and the liquid storage cylinder 9 at this speed. The liquid level in the liquid storage cylinder 9 is slightly higher than the height of the liquid in the cylinder. When the glass dropper head reaches the dripping port 4, due to gravity, the liquid reagent in the measuring cylinder 9 flows from the hose 11 to the inlet 3 of the glass dropper head, drips out from the dripping port 4, and drips into the reaction flask 100 through the dripping tube 8. After a set time, the height raised by the suspension arm 13 of the lifting device 12 and the measuring cylinder 9 is the liquid level height in the measuring cylinder 9 input during the set time. At this time, the bottom surface of the measuring cylinder 9 is level with the dripping port 4 of the glass dropper head, and all the liquid in the measuring cylinder 9 has flowed out into the reaction flask 100, completing the dripping process. Using this method of combining the glass dropper head with the lifting device, since the inlet 3 of the thin glass tube 2 is not higher than the dripping port 4, the liquid reagent drips at a uniform rate at the beginning of the dripping process, preventing siphoning.

[0039] The present invention will be described in detail below through embodiments, but the scope of protection of the present invention is not limited thereto. Example 1:

[0040] As shown in Figures 1 and 2, a glass dropper for use in a chemical laboratory includes a glass tube 1. The wall of the glass tube 1 is a hollow cylinder with openings at the top and bottom. A thin glass tube 2 is inserted into the side wall of the glass tube 1. One end of the thin glass tube 2 on the outside of the glass tube 1 is a liquid inlet 3, and the other end inside the glass tube 1 is a dropper 4.

[0041] The glass cylinder 1 is provided with an upper grinding interface 6 at its upper opening, and the lower opening of the upper grinding interface 6 is connected to the upper opening of the glass cylinder 1.

[0042] The glass cylinder 1 is provided with a lower grinding interface 7 at its lower opening. A dripping tube 8 is provided in the lower grinding interface 7. The upper opening of the dripping tube 8 is connected to the bottom of the glass cylinder 1, and the lower opening of the dripping tube 8 extends out from the lower part of the lower grinding interface 7.

[0043] The upper grinding interface 6 of the glass dropper can be connected to other glass instruments, the lower grinding interface 7 can be easily connected to the reaction flask 100, and the dropper tube 8 can prevent the liquid reagent from dripping down the inner wall of the reaction flask 100, making it easy to observe the dripping situation. Example 2:

[0044] As shown in Figure 3, the basic content is the same as in Embodiment 1, except that: two thin glass tubes 2 are provided on the side wall of the glass cylinder 1, and the two thin glass tubes 2 are arranged opposite each other. A lower grinding interface 7 is provided at the lower opening of the glass cylinder 1, and a dripping tube 8 is provided at the lower opening of the lower grinding interface 7. The two thin glass tubes 2 of this dripping head can perform two-way dripping. Example 3:

[0045] As shown in Figure 4, the basic content is the same as in Embodiment 2, except that: three thin glass tubes 2 are arranged on the side wall of the glass cylinder 1. The first thin glass tube 2 and the second thin glass tube are arranged opposite each other, and the angle between the third thin glass tube and the first two thin glass tubes is 90°. The three thin glass tubes 2 can be used for three-way dripping. Example 4:

[0046] As shown in Figure 5, the basic content is the same as in Embodiment 3, except that the glass tube 1 is drum-shaped. The advantage of this structure is that a small portion of the thin glass tube is inserted into the glass tube 1, leaving a large space in the middle of the glass tube, which facilitates the connection of other glass instruments to the upper grinding interface. Secondly, the three drip ports 4 are further separated, allowing for clearer observation of the dripping situation at each drip port. Example 5:

[0047] As shown in Figure 6, a glass dropper for a chemical laboratory includes a glass tube 1 with a hollow cylindrical wall. A sealing baffle 5 is provided at the upper opening of the glass tube 1. A thin glass tube 2 is inserted into the side wall of the glass tube 1. One end of the thin glass tube 2 on the outside of the glass tube 1 is a liquid inlet 3, and the other end inside the glass tube 1 is a dropper 4. A lower grinding interface 7 is provided at the lower opening of the glass tube 1. In this structure, the sealing baffle 5 is made of glass, allowing for convenient and clear observation of the droplet process. Example 6:

[0048] As shown in Figure 7, the basic content is the same as in Example 5, except that a dropper 8 is provided at the lower opening of the glass cylinder 1. The dropper 8 can be inserted into a rubber stopper, which facilitates the connection of the dropper head to a non-standard ground glass reaction flask or other instruments and equipment. Example 7:

[0049] As shown in Figure 8, the basic content is the same as in Example 3, except that: the feed inlet 101 of the reaction flask 100 is at an angle. When the glass dropper head is inserted into the feed inlet 101 and rotated to a suitable position, the two oppositely arranged thin glass tubes 2 of the glass dropper head are in a horizontal state, and the inlet 3 of the third tube is in a downward tilted state. The inlets 3 of the three thin glass tubes are not higher than the dropper 4, which meets the requirements of the dropper device. Example 8:

[0050] As shown in Figure 9, three glass dropper heads A, B, and C are stacked and inserted into the feed inlet 101 of the reaction flask 100 to form a nine-channel dropper assembly. Since no other glass instruments need to be inserted on glass dropper head A, a glass dropper head sealed with a sealing baffle 5 is selected. The large glass area makes it easier to observe the dropper state. Because glass dropper head A needs to be inserted into dropper head B, a structure with only a lower grinding interface 7 and no dropper tube 8 is selected. Because dropper head C needs to be inserted into the grinding interface 101 of the reaction flask 100, a structure with a lower grinding interface 7 and a dropper tube 8 is selected. The dropper tube 8 prevents the dripping liquid from flowing along the reaction flask wall, allowing for clearer observation of the dropper situation.

Claims

1. A glass dropper for use in a chemical laboratory, characterized in that: The glass cylinder (1) includes 1-3 thin glass tubes (2) on its side wall. The end of the thin glass tube (2) outside the glass cylinder (1) is a liquid inlet (3), and the end of the thin glass tube (2) inside the glass cylinder is a drip outlet (4). The glass cylinder (1) has an upper opening and a lower opening. The upper opening of the glass cylinder (1) is provided with a sealing baffle (5) or an upper grinding interface (6), and the lower opening of the glass cylinder (1) is provided with a lower connecting part.

2. The glass dropper for a chemical laboratory as described in claim 1, characterized in that: The lower connecting part is the lower grinding interface (7).

3. The glass dropper for a chemical laboratory as described in claim 1, characterized in that: The lower connecting part is a lower grinding interface (7), and a dripping tube (8) is provided inside the lower grinding interface (7). The upper opening of the dripping tube (8) is connected to the lower opening of the glass tube (1).

4. A glass dropper for a chemical laboratory as described in claim 1, characterized in that: The lower connecting part is a lower grinding interface (7), and a dripping tube (8) is provided at the lower part of the lower grinding interface (7).

5. A glass dropper for a chemical laboratory as described in claim 1, characterized in that: The lower connecting part is a drip tube (8).

6. A glass dropper for a chemical laboratory as described in claim 1, characterized in that: The glass tube (1) is cylindrical or drum-shaped.

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