Micro-liquid discontinuous titration experimental device

Abstract

The utility model discloses a discontinuous titration experimental device for trace liquid. According to the device, a main pipe is provided with a one-way valve, the one-way valve is located below a burette, a return pipe is an L-shaped pipe, and a switch valve is arranged on the return pipe; the connection position of the return pipe and the main pipe is lower than the one-way valve; the bottom of the main pipe penetrates through the bottle plug and is inserted into the test solution bottle; the top of the main pipe penetrates through the bottom of the overflow cup, and the orifice of the main pipe is higher than the inner bottom surface of the overflow cup and lower than the top of the overflow cup; the orifice of the return pipe penetrates through the overflow cup to be communicated with the overflow cup and is not higher than the inner bottom surface of the overflow cup; the inflation assembly comprises an inflation tube and a balloon, one end of the inflation tube penetrates through the bottle plug and is inserted into the test solution bottle, and a bottom tube opening of the inflation tube is higher than the liquid level in the test solution bottle; the other end of the inflation tube is connected with the balloon. According to the utility model, the liquid feeding mode can be optimized, the leakage and waste of test liquid are avoided, and the accuracy of experimental data is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical experimental equipment, in particular to a micro-liquid discontinuous titration experimental device. Background Art

[0002] In most cases, laboratory titration analysis uses manual titration, where the burette is operated manually to conduct experiments. The consumed volume is determined by visually observing the changes in the liquid level indicator scale in the burette for subsequent analysis and calculation. Since the entire process requires manual operation, manual errors such as liquid level reading errors and burette switch operation timing seriously affect the accuracy of the experiment, especially for titration experiments that require repeated operations and comparisons.

[0003] In the existing technical solutions, such as a micro-liquid titration device with authorization announcement number CN 216484841 U, a stepper motor, a screw and a threaded sleeve are used in combination to achieve precise control of the amount of liquid entering the needle, thereby controlling the amount of sample spotting. However, this electric titration device is relatively expensive for small titration experiments.

[0004] For example, a micro-burette with application publication number CN 103033593 A has a liquid storage tube and a burette, the bottom of the liquid storage tube is connected to the bottom of the burette, an L-shaped tube and a capillary tube are arranged on the side of the top of the liquid storage tube, so that the top of the liquid storage tube is connected to the top of the burette, the test liquid enters the liquid storage tube through the liquid inlet valve, the liquid inlet valve is closed, the liquid outlet valve is opened, the gas enters the liquid storage tube through the capillary tube and the L-shaped tube, the gas pressure is the same, the liquid in the liquid storage tube flows into the burette, and when the liquid level in the burette reaches the 0 scale line, the capillary tube connected to the burette is closed. One end is sealed with test liquid, so that the test liquid in the liquid storage tube no longer enters the burette, and the liquid outlet valve is closed and the titration valve is opened to perform titration; however, in this titration method, each time, the liquid needs to enter the liquid storage tube from the liquid inlet valve above the liquid storage tube. The capacity of the liquid storage tube is limited, and liquid needs to be added multiple times. This liquid addition method is more troublesome, and the test liquid is easy to leak and waste; at the same time, if the liquid outlet valve of the liquid storage tube is loose or other faults occur, the degree of drop of the liquid level in the burette will be affected during the titration experiment, thereby affecting the accuracy of the experiment. Summary of the invention

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and propose a micro-liquid discontinuous titration experimental device, which can meet the needs of small-scale experiments, has low cost, reduces the number of liquid fillings, and optimizes the liquid filling method to avoid waste caused by leakage of test liquid, while improving the accuracy of experimental data.

[0006] In order to achieve the above objectives, the utility model proposes the following technical solutions:

[0007] A micro-liquid discontinuous titration experimental device comprises an overflow cup, a main pipe, a reflux pipe, a burette, a test solution bottle and an air filling assembly. The main pipe is provided with a scale and a bottle stopper is provided on the top of the test solution bottle to seal the test solution bottle.

[0008] The burette is provided with a switch, the burette is arranged on one side of the main pipe, the main pipe is provided with a one-way valve, the one-way valve is located below the burette, the reflux pipe is an L-shaped pipe, and the reflux pipe is provided with a switch valve; the lower bend of the reflux pipe is connected to the main pipe, and the connection position of the reflux pipe and the main pipe is lower than the one-way valve; the bottom of the main pipe passes through the bottle stopper and is inserted into the test solution bottle, and the pipe mouth at the bottom of the main pipe is lower than the liquid level in the test solution bottle.

[0009] The top of the main pipe passes through the bottom of the overflow cup, and the top pipe opening of the main pipe is higher than the inner bottom surface of the overflow cup, but lower than the top of the overflow cup; the top of the reflux pipe passes through the bottom of the overflow cup and is connected with the inside of the overflow cup, but the reflux pipe opening is not higher than the inner bottom surface of the overflow cup.

[0010] The inflation component includes an inflation tube and a balloon. One end of the inflation tube passes through the bottle stopper and is inserted into the test solution bottle. The bottom tube opening of the inflation tube is higher than the liquid level in the test solution bottle. The other end of the inflation tube is connected to the balloon. The balloon is an inflatable balloon. An air inlet valve is provided on the balloon. Air can be inflated into the test solution bottle by squeezing the balloon. At the same time, the air inlet valve automatically replenishes air into the balloon. When the balloon is squeezed, the air inlet valve is in a closed state. When the balloon is released, the air inlet valve is in an open state.

[0011] The balloon is already known in the prior art and can be directly used by those skilled in the art.

[0012] Preferably, an air valve is provided at one end of the inflation tube connected to the balloon to play the role of opening and closing.

[0013] Preferably, a one-way air valve is provided at one end of the inflation tube connected to the balloon, and an air release valve is provided on the inflation tube. The one-way air valve is located between the air release valve and the balloon. The setting of the one-way air valve allows gas to flow from the balloon into the test solution bottle only, so that the liquid level of the test solution in the main tube rises steadily; the air release valve is provided to allow the test solution bottle to communicate with the external gas, so that excess test solution returns to the test solution bottle.

[0014] Preferably, the burette is arranged on one side of the lower half of the main pipe, and the angle θ between the axis of the burette and the main pipe is 80°-90°.

[0015] Preferably, the switch valve is located higher than the one-way valve.

[0016] Preferably, the inflation tube includes an inflation glass tube and an inflation hose, the inflation glass tube passes through the bottle stopper and is inserted into the test solution bottle, the mouth of the inflation glass tube is higher than the liquid level in the test solution bottle; one end of the inflation hose is connected to the balloon, and the other end of the inflation hose is connected to the inflation glass tube.

[0017] Preferably, the included angle θ between the axis of the burette and the main pipe is 85°.

[0018] Preferably, the inner wall of the overflow cup is an inclined inner wall, and the inner diameter of the top of the overflow cup is larger than the inner diameter of the bottom of the overflow cup.

[0019] Preferably, the bottom through hole on the inner bottom surface of the overflow cup is the lowest point of the inner bottom surface of the overflow cup, and other parts of the inner bottom surface are higher than the bottom through hole.

[0020] Preferably, the main pipe, reflux pipe and burette are transparent glass instruments.

[0021] Preferably, the materials used for the test solution bottle, overflow cup, switch, switch valve, and one-way valve are determined according to the chemical properties of the test solution itself.

[0022] Preferably, the material of the bottle stopper is determined according to the chemical properties of the test solution, and can be a glass bottle stopper, a rubber bottle stopper, etc.

[0023] Specifically, before use, the switch valve and the switch are both in a closed state, and the one-way valve is in an open state.

[0024] When in use, first squeeze the balloon slowly to increase the air pressure in the test solution bottle, and the test solution is squeezed into the main tube. The squeezing frequency of the balloon needs to be controlled. After the test solution enters the main tube through the one-way valve, the liquid level continues to rise. When it rises to the burette, it flows into the burette. After the burette is full, the liquid level in the main tube will continue to rise. If the balloon is squeezed too quickly, the liquid level in the main tube will rise too quickly, and bubbles will remain in the burette.

[0025] Continue to squeeze the balloon slowly, and the test liquid level in the main pipe continues to rise. When the test liquid fills the main pipe, continue to squeeze the balloon slowly to make the test liquid overflow the main pipe and flow into the overflow cup, and then gather at the bottom of the overflow cup and flow into the reflux pipe. When there is test liquid in the reflux pipe but no test liquid at the bottom of the overflow cup, stop squeezing the balloon, the air inlet valve is in the open state, and the gas in the test liquid bottle is released through the air inlet valve. At the same time, open the switch valve to make the test liquid below the reflux pipe and the main pipe check valve flow back into the test liquid bottle. At the same time, due to the setting of the check valve, the test liquid above the main pipe check valve will not flow back.

[0026] Finally, turn on the switch and conduct the titration experiment. After one titration is completed, read the scale line corresponding to the test solution level in the main tube to obtain the volume of the test solution used for this titration. Repeat the above steps for the next titration.

[0027] The beneficial effects of the utility model are:

[0028] The utility model uses the gas filling assembly, the test liquid bottle, the main pipe, the one-way valve and the overflow cup in coordination, so that the test liquid fills the main pipe in the manner of liquid flowing from the bottom without mixing with air, thereby ensuring the accuracy of the test.

[0029] The utility model fills the main pipe by adding liquid from the bottom. After one titration, only one reading is needed to calculate the volume of the test solution used for one titration, thereby reducing manual errors and further ensuring the accuracy of the test.

[0030] The utility model simplifies the liquid supply method by directly supplying liquid from the test liquid bottle to the main pipe, thereby avoiding leakage and waste caused by the conventional liquid supply method.

[0031] The utility model uses the main pipe, the overflow cup and the inflation component in combination, so that the liquid filling volume is constant at one time, the operation mode is simplified and the efficiency is improved.

[0032] The utility model enables the burette to be quickly filled with test liquid during liquid addition through the inclined arrangement of the burette and the main pipe and the cooperation of the inflation component, so as to improve the operation efficiency.

[0033] By adopting the above scheme, the utility model can meet the needs of small-scale experiments, has low cost, reduces the number of liquid filling times, and optimizes the liquid filling method to avoid waste of test liquid leakage; at the same time, it reduces the number of readings, reduces human errors, simplifies the operation method, improves efficiency, and ensures the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0035] Figure 1 It is a schematic diagram of the overall structure of the first embodiment.

[0036] Figure 2 Schematic diagram of the upper structure of the first embodiment.

[0037] Figure 3 Schematic diagram of the lower structure of the first embodiment.

[0038] Figure 4 yes Figure 1 A magnified schematic diagram of center A.

[0039] Figure 5 It is a schematic diagram of the overall structure of the second embodiment.

[0040] In the figure, 1-overflow cup, 2-main pipe, 3-reflux pipe, 4-switch, 5-burette, 6-switch valve, 7-check valve, 8-Y-shaped tube, 9-gas-filled glass tube, 10-gas-filled hose, 11-check valve, 12-balloon, 13-bottle stopper, 14-test solution bottle, 15-liquid level, 16-pressure relief valve. Implementation

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0042] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0043] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] First embodiment:

[0046] like Figure 1 As shown, a micro-liquid discontinuous titration experimental device includes an overflow cup 1, a main pipe 2, a reflux pipe 3, a burette 5, a test solution bottle 14, and an inflation component. The main pipe 2 is provided with a scale, and a bottle stopper 13 is provided on the top of the test solution bottle 14. The bottle stopper 13 serves to close the test solution bottle.

[0047] like Figure 3As shown, the burette 5 is provided with a switch 4, and the burette 5 is arranged on one side of the main pipe 2. The main pipe 2 is provided with a one-way valve 7, and the one-way valve 7 is located below the burette 5. The reflux pipe 3 is an L-shaped pipe, and the reflux pipe 3 is provided with a switch valve 6; the lower bend of the reflux pipe 3 is connected to the main pipe 2, and the connection position of the reflux pipe 3 and the main pipe 2 is lower than the one-way valve 7; the bottom of the main pipe 2 passes through the bottle stopper 13 and is inserted into the test solution bottle 14, and the bottom pipe opening of the main pipe 2 is lower than the liquid level 15 in the test solution bottle 14.

[0048] like Figure 2 As shown, the top of the main pipe 2 passes through the bottom of the overflow cup 1, and the top pipe opening of the main pipe 2 is higher than the inner bottom surface of the overflow cup 1, but lower than the top of the overflow cup 1; the top of the reflux pipe 3 is inserted into the bottom of the overflow cup 1 and connected with the inside of the overflow cup 1, and the pipe opening of the reflux pipe 3 is not higher than the inner bottom surface of the overflow cup 1.

[0049] The inflation component includes an inflation tube and a balloon 12, one end of the inflation tube passes through the bottle stopper 13 and is inserted into the test solution bottle 14, and the bottom tube opening of the inflation tube is higher than the liquid level in the test solution bottle 14; the other end of the inflation tube is connected to the balloon 12; the balloon 12 is an inflatable balloon, and an air inlet valve is provided on the balloon 12, which can be used to inflate the test solution bottle by squeezing the balloon 12, and the air inlet valve automatically replenishes air into the balloon 12, and the air inlet valve is in a closed state when the balloon 12 is squeezed, and the air inlet valve is in an open state when the balloon 12 is released.

[0050] Specifically, before use, the switch valve 6 and the switch 4 are both in a closed state, and the one-way valve 7 is in an open state.

[0051] When in use, first slowly squeeze the balloon 12 to increase the air pressure in the test solution bottle 14, and the test solution is squeezed into the main tube 2. The squeezing frequency of the balloon 12 needs to be controlled. After the test solution enters the main tube 2 through the one-way valve 7, the liquid level continues to rise. When it rises to the burette 5, it flows into the burette 5. After the burette 5 is full, the liquid level in the main tube 2 will continue to rise. If the balloon 12 is squeezed too quickly, the liquid level in the main tube 2 will rise too quickly, and bubbles will remain in the burette 5.

[0052] Continue to squeeze the balloon 12 slowly, and the test liquid level in the main pipe 2 continues to rise. When the test liquid fills the main pipe 2, continue to squeeze the balloon slowly to make the test liquid overflow the main pipe 2 and flow into the overflow cup 1, and then gather at the bottom of the overflow cup 1 and flow into the reflux pipe 3; when there is test liquid in the reflux pipe 3 and there is no test liquid at the bottom of the overflow cup 1, stop squeezing the balloon 12, the air inlet valve is in an open state, and the gas in the test liquid bottle 14 is released through the air inlet valve. At the same time, the switch valve 6 is opened to make the test liquid in the reflux pipe 3 and below the one-way valve 7 of the main pipe 2 flow back into the test liquid bottle 14. At the same time, due to the setting of the one-way valve 7, the test liquid above the one-way valve 7 of the main pipe 2 will not flow back.

[0053] Finally, turn on switch 4 to conduct a titration experiment. After one titration is completed, read the scale line corresponding to the test solution level in the main tube 2 to obtain the volume of the test solution used in this titration. Repeat the above steps for the next titration.

[0054] Second embodiment:

[0055] like Figure 5 As shown, a micro-liquid discontinuous titration experimental device includes an overflow cup 1, a main pipe 2, a reflux pipe 3, a burette 5, a test solution bottle 14, and an inflation component. The main pipe 2 is provided with a scale, and a bottle stopper 13 is provided on the top of the test solution bottle 14. The bottle stopper 13 serves to close the test solution bottle.

[0056] like Figure 3 As shown, the burette 5 is provided with a switch 4, and the burette 5 is arranged on one side of the main pipe 2. The main pipe 2 is provided with a one-way valve 7, and the one-way valve 7 is located below the burette 5. The reflux pipe 3 is an L-shaped pipe, and the reflux pipe 3 is provided with a switch valve 6; the lower bend of the reflux pipe 3 is connected to the main pipe 2, and the connection position of the reflux pipe 3 and the main pipe 2 is lower than the one-way valve 7; the bottom of the main pipe 2 passes through the bottle stopper 13 and is inserted into the test solution bottle 14, and the bottom pipe opening of the main pipe 2 is lower than the liquid level 15 in the test solution bottle 14.

[0057] like Figure 2 As shown, the top of the main pipe 2 passes through the bottom of the overflow cup 1, and the top pipe opening of the main pipe 2 is higher than the inner bottom surface of the overflow cup 1, but lower than the top of the overflow cup 1; the top of the reflux pipe 3 is inserted into the bottom of the overflow cup 1 and connected with the inside of the overflow cup 1, and the pipe opening of the reflux pipe 3 is not higher than the inner bottom surface of the overflow cup 1.

[0058] The inflation component includes an inflation tube and a balloon 12, one end of the inflation tube passes through the bottle stopper 13 and is inserted into the test solution bottle 14, and the bottom tube opening of the inflation tube is higher than the liquid level in the test solution bottle 14; the other end of the inflation tube is connected to the balloon 12; the balloon 12 is an inflatable balloon, and an air inlet valve is provided on the balloon 12, which can be used to inflate the test solution bottle by squeezing the balloon 12, and the air inlet valve automatically replenishes air into the balloon 12, and the air inlet valve is in a closed state when the balloon 12 is squeezed, and the air inlet valve is in an open state when the balloon 12 is released.

[0059] like Figure 5 As shown, a one-way air valve 11 is provided at one end of the inflation tube connected to the balloon 12, and an air release valve 16 is provided on the inflation tube. The one-way air valve 11 is located between the air release valve 16 and the balloon 12. The setting of the one-way air valve 11 allows gas to flow from the balloon 12 into the test solution bottle 14 only, so that the liquid level of the test solution in the main pipe 2 rises steadily; the air release valve 16 is provided to allow the test solution bottle 14 to communicate with the external gas, so that excess test solution returns to the test solution bottle 14.

[0060] The burette is arranged on one side of the lower half of the main pipe, and the included angle θ between the burette and the axis of the main pipe is 85°.

[0061] Specifically, before use, the switch valve 6, the switch 4 and the air release valve 16 are all in a closed state, and the one-way valve 7 and the one-way air valve are in an open state.

[0062] When in use, first slowly squeeze the balloon 12 to increase the air pressure in the test solution bottle 14, and the test solution is squeezed into the main tube 2. The squeezing frequency of the balloon 12 needs to be controlled. After the test solution enters the main tube 2 through the one-way valve 7, the liquid level continues to rise. When it rises to the burette 5, it flows into the burette 5. After the burette 5 is full, the liquid level in the main tube 2 will continue to rise. If the balloon 12 is squeezed too quickly, the liquid level in the main tube 2 will rise too quickly, and bubbles will remain in the burette 5.

[0063] Continue to squeeze the balloon 12 slowly, and the test liquid level in the main pipe 2 continues to rise. When the test liquid fills the main pipe 2, continue to squeeze the balloon slowly to make the test liquid overflow the main pipe 2 and flow into the overflow cup 1, and then gather at the bottom of the overflow cup 1 and flow into the reflux pipe 3; when there is test liquid in the reflux pipe 3 and there is no test liquid at the bottom of the overflow cup 1, stop squeezing the balloon 12, and open the switch valve 6 and the air release valve 16 at the same time, and the gas in the test liquid bottle 14 is released through the air release valve 16, so that the test liquid in the reflux pipe 3 and below the one-way valve 7 of the main pipe 2 flows back into the test liquid bottle 14. At the same time, due to the setting of the one-way valve 7, the test liquid above the one-way valve 7 of the main pipe 2 will not flow back.

[0064] Finally, turn on switch 4 to conduct a titration experiment. After one titration is completed, read the scale line corresponding to the test solution level in the main tube 2 to obtain the volume of the test solution used in this titration. Repeat the above steps for the next titration.

[0065] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A micro-liquid discontinuous titration experimental device, comprising a main pipe, a burette and a test solution bottle, wherein the main pipe is provided with a scale, the burette is arranged on one side of the main pipe, and the test solution bottle is provided with a bottle stopper; characterized in that: It also includes an overflow cup, a main pipe, a reflux pipe, a burette, a test solution bottle and an inflation component. The main pipe is provided with a one-way valve, which is located below the burette. The reflux pipe is an L-shaped pipe, and a switch valve is provided on the reflux pipe. The lower bend of the reflux pipe is connected to the main pipe, and the connection position between the reflux pipe and the main pipe is lower than the one-way valve. The bottom of the main pipe passes through the bottle stopper and is inserted into the test solution bottle, and the pipe opening at the bottom of the main pipe is lower than the liquid level in the test solution bottle. The top of the main pipe passes through the bottom of the overflow cup, and the pipe opening at the top of the main pipe is higher than the inner bottom surface of the overflow cup, but lower than the top of the overflow cup. The top of the reflux pipe is inserted into the bottom of the overflow cup and communicated with the inside of the overflow cup, and the pipe opening of the reflux pipe is not higher than the inner bottom surface of the overflow cup. The inflation component includes an inflation pipe and a balloon, one end of the inflation pipe passes through the bottle stopper and is inserted into the test solution bottle, and the pipe opening at the bottom of the inflation pipe is higher than the liquid level in the test solution bottle. The other end of the inflation pipe is connected to the balloon. The balloon is an inflatable balloon, and an air inlet valve is provided on the balloon.

2. The micro-liquid discontinuous titration experimental device according to claim 1, characterized in that: An air valve is arranged at one end of the inflation tube connected to the balloon.

3. The micro-liquid discontinuous titration experimental device according to claim 1, characterized in that: A one-way air valve is arranged at one end of the inflation tube connected to the balloon, and an air release valve is arranged on the inflation tube, wherein the one-way air valve is located between the air release valve and the balloon.

4. The micro-liquid discontinuous titration experimental device according to claim 1, characterized in that: The burette is arranged on one side of the lower half of the main pipe, and the included angle θ between the burette and the axis of the main pipe is 80°-90°.

5. The micro-liquid discontinuous titration experimental device according to claim 1, characterized in that: The switch valve is located higher than the one-way valve.

6. The micro-liquid discontinuous titration experimental device according to claim 1, characterized in that: The inner wall of the overflow cup is an inclined inner wall, and the inner diameter of the top of the overflow cup is greater than the inner diameter of the bottom of the overflow cup.

7. The micro-liquid discontinuous titration experimental device according to claim 1, characterized in that: The bottom through hole on the inner bottom surface of the overflow cup is the lowest point of the inner bottom surface of the overflow cup, and other parts of the inner bottom surface are higher than the bottom through hole.

8. The micro-liquid discontinuous titration experimental device according to claim 1, characterized in that: The inflation tube includes an inflation glass tube and an inflation hose. The inflation glass tube passes through the bottle stopper and is inserted into the test solution bottle. The tube mouth of the inflation glass tube is higher than the liquid level in the test solution bottle. One end of the inflation hose is connected to the balloon, and the other end of the inflation hose is connected to the inflation glass tube.

9. The micro-liquid discontinuous titration experimental device according to claim 4, characterized in that: The included angle θ between the axis of the burette and the main pipe is 85°.

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