Automatic liquid adding and zero setting device for analytical test burette

Abstract

The utility model relates to an automatic liquid adding and zero setting device for an analytical test burette. The vacuum pump is communicated with a first valve port of the three-way valve through a negative pressure pipeline, a second valve port of the three-way valve is communicated with the atmosphere, a third valve port of the three-way valve is communicated with a first valve port of the three-way shunting device through a communicating pipe, one end of the liquid supply pipeline is communicated with the liquid inlet pipeline, and the other end of the liquid supply pipeline is communicated with the titrant storage bottle; the outer wall of the upper end of the liquid inlet pipeline is hermetically connected with the second valve port of the three-way shunting device, the lower end of the liquid inlet pipeline penetrates through and is connected to the outer end of the third valve port of the three-way shunting device and extends into the burette, and a gap is reserved between the lower end of the liquid inlet pipeline and the inner wall of the three-way shunting device. Compared with the prior art, the automatic zero setting of the burette is realized, manual adding once every titration is not needed, the time is reduced from about 20 seconds of manual standard solution adding for zero setting to about 2 seconds of automatic zero setting at present, the titration efficiency is improved, the error probability in the production process is reduced, meanwhile, the reagent waste is avoided, and the cost is saved.

Description

Technical Field

[0001] This application relates to the technical field of titration devices, and in particular, to an automatic liquid addition and zero adjustment device for an analytical test burette. Background Art

[0002] In titrimetric analysis, a burette is used for titration. For each sample to be measured, the titrant needs to be poured into a beaker and then transferred to the burette. After adjusting to zero, the titration is carried out. During the zero adjustment process, the standard solution exceeding the zero point is discarded. Such a titration method causes waste of reagents and low titration efficiency. Summary of the Utility Model

[0003] To solve or partially solve the problems existing in the related technologies, this application provides an automatic liquid addition and zero adjustment device for an analytical test burette, which can realize automatic zero adjustment of the burette, improve titration efficiency, avoid waste of reagents, and save costs.

[0004] This application provides an automatic liquid addition and zero adjustment device for an analytical test burette, including a vacuum pump 1, a negative pressure pipeline 2, a three-way valve 3, a three-way shunt device 4, a connecting pipe 5, a liquid supply pipeline 6, a titrant storage bottle 7, a liquid inlet pipeline 8, and a burette 9.

[0005] The vacuum pump 1 is connected to the first valve port of the three-way valve 3 through the negative pressure pipeline 2. The second valve port of the three-way valve 3 is connected to the atmosphere. The third valve port is connected to the first valve port of the three-way shunt device 4 through the connecting pipe 5. One end of the liquid supply pipeline 6 is connected to the liquid inlet pipeline 8, and the other end is connected to the titrant storage bottle 7. The upper outer wall of the liquid inlet pipeline 8 is hermetically connected to the second valve port of the three-way shunt device 4, and its lower end penetrates and is connected to the outer end of the third valve port of the three-way shunt device 4 and extends into the burette 9. A gap is reserved between the lower end of the liquid inlet pipeline 8 and the inner wall of the three-way shunt device 4.

[0006] The liquid supply pipeline 6 and the liquid inlet pipeline 8 are connected to form a U-shaped pipeline. The position of the end of the liquid supply pipeline 6 in the titrant storage bottle 7 is much lower than the position of the zero scale line of the burette 9, and the lower end of the liquid inlet pipeline 8 is flush with the zero scale line of the burette 9. The third valve port of the three-way shunt device 4 is hermetically connected to the burette 9.

[0007] Optionally, in some solutions, a negative pressure buffer bottle 10 is installed on the negative pressure pipeline 2 between the vacuum pump 1 and the three-way valve 3.

[0008] Optionally, in some solutions, soft materials are used for sealing and fixing between the three-way valve 3 and the negative pressure pipeline 2 and the connecting pipe 5, between the three-way shunt device 4 and the connecting pipe 5, the liquid inlet pipeline 8, and the burette 9, and between the liquid supply pipeline 6 and the liquid inlet pipeline 8.

[0009] The technical solution provided by this application may include the following beneficial effects:

[0010] The structure of this application is simple, realizing automatic zero adjustment of the burette. There is no need to manually add the solution every time a titration is performed. The time for manual zero adjustment by adding the standard solution was about 20 seconds before, which has now been reduced to about 2 seconds for automatic zero adjustment by adding the solution. This improves the titration efficiency, reduces the probability of errors during the production process, and also avoids reagent waste and saves costs.

[0011] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] By describing the exemplary embodiments of this application in more detail in conjunction with the drawings, the above and other objects, features, and advantages of this application will become more apparent. Among them, in the exemplary embodiments of this application, the same reference numerals generally represent the same components.

[0013] Figure 1 is a schematic structural diagram of the automatic liquid adding and zero adjustment device for the analytical test burette shown in Embodiment 1 of this application;

[0014] Figure 2 is a schematic structural diagram of the connection structure of the liquid inlet pipe shown in the embodiment of this application;

[0015] Figure 3 is a schematic structural diagram of the automatic liquid adding and zero adjustment device for the analytical test burette shown in Embodiment 2 of this application.

[0016] REFERENCE NUMERALS

[0017] 1 - Vacuum pump, 2 - Negative pressure pipe, 3 - Three - way valve, 4 - Three - way shunt device, 5 - Connecting pipe, 6 - Liquid supply pipe, 7 - Titrant storage bottle, 8 - Liquid inlet pipe, 9 - Burette, 10 - Negative pressure buffer bottle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will describe the embodiments of this application in more detail with reference to the drawings. Although the embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0019] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, the meaning of "a plurality" is two or more, unless otherwise specifically and clearly defined.

[0020] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to this application.

[0021] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] In view of the above problems, the embodiment of this application provides an analytical test burette automatic liquid addition and zero adjustment device, which can realize the automatic zero adjustment of the burette, improve the titration efficiency, avoid reagent waste, and save costs.

[0023] The technical solutions of the embodiments of this application are described in detail below with reference to the drawings.

[0024] Embodiment 1

[0025] See Figure 1-2 , the analytical test burette automatic liquid addition and zero adjustment device includes a vacuum pump 1, a negative pressure pipeline 2, a three-way valve 3, a three-way shunt device 4, a connecting pipe 5, a liquid supply pipeline 6, a titrant storage bottle 7, a liquid inlet pipeline 8, and a burette 9.

[0026] The described vacuum pump 1 is connected to the first valve port of the three-way valve 3 through a negative pressure pipeline 2. The second valve port of the three-way valve 3 is connected to the atmosphere, and the third valve port is connected to the first valve port of the three-way shunt device 4 through a connecting pipe 5. One end of the liquid supply pipeline 6 is connected to the liquid inlet pipeline 8, and the other end is connected to the titrant storage bottle 7. The outer wall of the upper end of the liquid inlet pipeline 8 is hermetically connected to the second valve port of the three-way shunt device 4, and its lower end penetrates and is connected to the outer end of the third valve port of the three-way shunt device 4 and extends into the burette 9. A gap is reserved between the lower end of the liquid inlet pipeline 8 and the inner wall of the three-way shunt device 4. The connecting pipe 5 communicates with the burette 9 through the first valve port of the three-way shunt device 4 and the gap between the liquid inlet pipeline 8 and the inner wall of the three-way shunt device 4.

[0027] The liquid supply pipeline 6 and the liquid inlet pipeline 8 are connected to form a U-shaped pipeline. The position of one end of the liquid supply pipeline 6 inside the titrant storage bottle 7 is much lower than the position of the zero scale line of the burette 9, and the lower end of the liquid inlet pipeline 8 is flush with the zero scale line of the burette 9. The third valve port of the three-way shunt device 4 is hermetically connected to the burette 9.

[0028] During operation, the vacuum pump 1 starts to work. The three-way valve 3 is adjusted so that its first valve port and third valve port are opened and the second valve port is closed. At this time, the negative pressure fills the burette 9 through the negative pressure pipeline 2, the connecting pipe 5, and the gap between the three-way shunt device 4 and the liquid inlet pipeline 8, and then makes the liquid inlet pipeline 8 and the liquid supply pipeline 6 filled with negative pressure. Under the action of the negative pressure in the burette 9, the liquid inlet pipeline 8 and the liquid supply pipeline 6, the titrant in the titrant storage bottle 7 enters the burette 9 along the liquid supply pipeline 6 and the liquid inlet pipeline 8.

[0029] When the liquid level of the titrant in the burette 9 is higher than the zero scale line of the burette 9, the three-way valve 3 is adjusted so that its first valve port and third valve port are closed, and the negative pressure in the three-way shunt device 4, the burette 9, the liquid inlet pipeline 8 and the liquid supply pipeline 6 disappears. At this time, the negative pressure in the pipeline formed by the connection of the liquid inlet pipeline 8 and the liquid supply pipeline 6 disappears. Since the position of one end of the liquid supply pipeline 6 inside the titrant storage bottle 7 is much lower than the position of the zero scale line of the burette 9, according to the siphon principle, the titrant in the burette 9 returns to the titrant storage bottle 7. Since the lower end of the liquid inlet pipeline 8 is flush with the zero scale line of the burette 9, the titrant below the zero scale line of the burette 9 will not enter the titrant storage bottle 7, realizing the automatic zero adjustment of the burette 9.

[0030] During connection, soft materials are used for sealing and fixing between the three-way valve 3 and the negative pressure pipeline 2, the connecting pipe 5, between the three-way shunt device 4 and the connecting pipe 5, the liquid inlet pipeline 8, the burette 9, and between the liquid supply pipeline 6 and the liquid inlet pipeline 8 to ensure the sealing performance of the device.

[0031] Embodiment 2

[0032] See Figure 3, on the basis of Embodiment 1, a negative pressure buffer bottle 10 is installed on the negative pressure pipeline 2 between the vacuum pump 1 and the three-way valve 3.

[0033] After the vacuum pump 1 is started, a stable negative pressure can be formed in the negative pressure buffer bottle 10. When the negative pressure is high, the vacuum pump 1 can be turned off and still be used, which prolongs the service time, saves energy and reduces consumption. When the vacuum pump 1 is turned on for too long, the titrant in the burette 9 reaches the third valve port of the three-way shunt device 4, and under the action of negative pressure, it will enter the negative pressure pipeline 2 through the three-way shunt device 4 and the connecting pipe 5, and then enter the vacuum pump 1, causing damage to the vacuum pump 1. The setting of the negative pressure buffer bottle 10 can make the excess titrant enter the negative pressure buffer bottle 10, preventing the titrant from entering the vacuum pump 1 and damaging the vacuum pump 1.

[0034] After the titrant is added and zero adjustment is completed, the negative pressure in the negative pressure buffer bottle 10 can be released by opening the first valve port and the second valve port of the three-way valve 3.

[0035] The structure of this application is simple, realizing automatic zero adjustment of the burette. It is no longer necessary to manually add the standard solution for zero adjustment every time a titration is performed. The time has been reduced from about 20 seconds for manual addition and zero adjustment of the standard solution before to about 2 seconds for automatic addition and zero adjustment now, improving the titration efficiency, reducing the probability of errors in the production process, and also avoiding reagent waste and saving costs.

[0036] Finally, it should also be noted that in this article, relationships such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "including", "comprising" or any other variant are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] The unit described as a separation component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0038] The embodiments of the present application have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to technologies in the market, or to enable other ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An automatic liquid-adding and zero-adjusting device for an analytical test burette, characterized in that: The automatic liquid adding and zeroing device for the analytical test burette comprises a vacuum pump (1), a negative pressure pipeline (2), a three-way valve (3), a three-way flow dividing device (4), a connecting pipe (5), a liquid supply pipeline (6), a titrant storage bottle (7), a liquid inlet pipeline (8), and a burette (9); The vacuum pump (1) is connected to the first valve port of the three-way valve (3) through a negative pressure pipeline (2); the second valve port of the three-way valve (3) is connected to the atmosphere; the third valve port is connected to the first valve port of the three-way diverter (4) through a connecting pipe (5); one end of the liquid supply pipeline (6) is connected to the liquid inlet pipeline (8); the other end is connected to the titrant storage bottle (7); the upper end outer wall of the liquid inlet pipeline (8) is sealedly connected to the second valve port of the three-way diverter (4); the lower end thereof is connected to the outer end of the third valve port of the three-way diverter (4) and extends into the burette (9); a gap is reserved between the lower end of the liquid inlet pipeline (8) and the inner wall of the three-way diverter (4); The liquid supply pipe (6) is connected to the liquid inlet pipe (8) to form a U-shaped pipe. The position of one end of the liquid supply pipe (6) in the titrant storage bottle (7) is far lower than the position of the zero scale line of the burette (9), and the lower end of the liquid inlet pipe (8) is flush with the zero scale line of the burette (9). The third valve port of the three-way flow dividing device (4) is sealed and connected to the burette (9).

2. The automatic liquid adding and zeroing device for the analytical test burette according to claim 1, characterized in that: A negative pressure buffer bottle (10) is installed on the negative pressure pipeline (2) between the vacuum pump (1) and the three-way valve (3).

3. The automatic liquid adding and zeroing device for the analytical test burette according to claim 1, characterized in that: The three-way valve (3) and the negative pressure pipe (2), the connecting pipe (5), the three-way flow dividing device (4) and the connecting pipe (5), the liquid inlet pipe (8), the burette (9), and the liquid supply pipe (6) and the liquid inlet pipe (8) are all sealed and fixed with soft materials.

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