CN216309902U - Automatic zero setting burette device - Google Patents

Abstract

The utility model belongs to the technical field of experimental instruments, and particularly relates to an automatic zero setting burette device which comprises a sharp-mouth liquid guide pipe, a burette and a connector assembly sleeved at the pipe orifice of the burette, wherein one end of the sharp-mouth liquid guide pipe penetrates through the connector assembly and extends into the burette, and the other end of the sharp-mouth liquid guide pipe is connected with a soft liquid adding bottle; the joint assembly comprises a cylindrical tubular joint capable of radially contracting and a rotary cover sleeved on the joint, and the joint and the rotary cover are provided with thread structures matched with each other; the joint comprises a plurality of arc sections. The device accurately controls the position of the tip nozzle liquid guide pipe extending into the burette through the joint component, and can perform accurate zero setting; the sharp-mouth liquid guide tube is matched with the soft liquid feeding bottle, so that the standard titration solution consumed in the zero setting process can be reduced, and the reagent is saved; and, whole liquid feeding process all goes on in the pipeline, has effectively avoided pouring reagent solution into buret outer wall and has polluted the buret or spattered experimenter's phenomenon, and the device is simple easily to be operated.

Description

Automatic zero setting burette device

Technical Field

The utility model belongs to the technical field of experimental instruments, relates to a titration device capable of accurately quantifying and automatically zeroing, and particularly relates to an automatic zeroing burette device.

Background

Burettes, which are glass instruments used for measuring and accurately measuring reagent consumption volume, are often used in chemical laboratories, and have various volume specifications, and the commonly used volume is 50 mL. The burette is a slender glass tube with precise scales and uniform inner diameter, can continuously discharge liquid reagents with different volumes according to requirements, and can accurately read the volume of the liquid. The scale value above the burette scale is small, and the top is provided with a zero scale mark.

In the specific experiment operation process, reagents generally exceed zero scale marks when poured into the burette, and a knob switch below the reagent is required to be turned on, so that redundant reagents are discharged from the lower part of the burette. This operation has a drawback that the reagent may contaminate the outer wall of the burette or be splashed onto the hands of the laboratory worker during the process of pouring the reagent into the burette, and the extra reagent needs to be discharged from the lower part of the burette every time the operation is performed, resulting in a waste of the reagent.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems in the prior art, and provides an automatic zero setting burette device which can be used for adding liquid into a burette and automatically setting zero, the liquid adding process is safe and convenient to operate, redundant reagent in the burette can be directly sucked back into a liquid adding bottle after liquid adding is finished, and the reagent waste is avoided.

The technical scheme of the utility model is as follows:

an automatic zero setting burette device comprises a sharp-mouth liquid guide pipe, a burette and a connector component sleeved at the pipe orifice of the burette, wherein one end of the sharp-mouth liquid guide pipe penetrates through the connector component and extends into the burette, and the other end of the sharp-mouth liquid guide pipe is connected with a soft liquid feeding bottle; the joint assembly comprises a cylindrical tubular joint capable of radially contracting and a rotary cover sleeved on the joint, and the joint and the rotary cover are provided with thread structures matched with each other; the joint comprises a plurality of arc segments.

Furthermore, the joint is composed of a circular ring base and three arc sections fixedly connected to the base, the three arc sections form a cylindrical pipe, and the joint is of an integrated structure; the outer side wall of the arc section is provided with a thread structure, and the inner side wall of the screw cap is provided with a thread structure matched with the thread of the arc section.

Furthermore, a certain gap is reserved between the three arc sections, the screw cap is a hollow round table, and the screw cap can be sleeved on a cylindrical tubular joint formed by the three arc sections; the base below sets firmly a ring that has a take the altitude, the internal diameter of ring slightly is greater than the external diameter at the burette mouth of pipe, thereby the ring cover is located the burette mouth of pipe makes joint Assembly fixed mounting in on the burette.

Further, the joint is made of plastic with certain deformation capacity, and the circular ring is made of rubber material with certain elasticity.

Further, the outer diameter of the tip liquid guide pipe is slightly smaller than the inner diameter of the burette; one end of the sharp nozzle liquid guide tube extends into the burette, and the other end of the sharp nozzle liquid guide tube is communicated with the soft liquid adding bottle through the connecting tube.

Furthermore, the tip liquid guide tube is made of transparent glass materials, and the soft liquid feeding bottle is a soft plastic bottle.

Further, the connecting pipe is made of latex materials and is a latex pipe.

The utility model has the beneficial effects that:

according to the automatic zero setting burette device provided by the utility model, the position of the tip nozzle liquid guide pipe entering the burette is accurately controlled through the joint component, so that accurate zero setting can be carried out; the sharp-mouth liquid guide tube is matched with the soft liquid feeding bottle, so that the standard titration solution consumed in the zero setting process can be reduced, and the reagent is saved; and, whole liquid feeding process all goes on in the pipeline, has effectively avoided pouring reagent solution into buret outer wall and has polluted the buret or spattered experimenter's phenomenon, and the device is simple easily to be operated.

Drawings

FIG. 1 is a state diagram of the use of the self-zeroing burette apparatus provided by the present invention;

FIG. 2 is a perspective view of an autozero burette apparatus provided in accordance with the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is an exploded view of the connector assembly;

in each of the above figures, 1, a burette; 2. a sharp-nose catheter; 3. a joint assembly; 31. a joint; 32. screwing a cover; 4. a soft liquid adding bottle; 5. a connecting pipe; 6. and (7) mounting frames.

Detailed Description

The utility model is further described below with reference to the figures and examples.

In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "one end" and "the other end" indicate orientations or positional relationships based on positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 and 2, the present invention relates to an automatic zero setting burette device, which comprises a sharp-nose liquid guide tube 2, a burette 1 and a joint component 3 sleeved at the orifice of the burette 1, wherein one end of the sharp-nose liquid guide tube 2 passes through the joint component 3 and extends into the burette 1, and the sharp-nose liquid guide tube 2 can be fixed at a specific position in the burette 1 through the joint component 3.

When the tip end of the tip catheter 2 is inserted into the burette 1 at the zero graduation mark position, it can be fixed and kept in this position by the adapter assembly 3, as shown in fig. 3. The other end of the sharp-mouth liquid guide tube 2 is connected with a soft liquid adding bottle 4, a reagent for titration is contained in the soft liquid adding bottle 4, the sharp-mouth liquid guide tube 2 is communicated with the soft liquid adding bottle 4 through a connecting tube 5, and the reagent enters the sharp-mouth liquid guide tube 2 from the soft liquid adding bottle 4 through the connecting tube 5 and then enters the burette 1. The outer diameter of the sharp-mouth liquid guide pipe 2 is slightly smaller than the inner diameter of the burette 1, so that the sharp-mouth liquid guide pipe 2 can smoothly extend into the burette 1; the sharp-nose liquid guide tube 2 and the burette 1 are made of the same material and are made of transparent glass material. The connecting pipe 5 is a latex pipe and cannot be corroded by a reagent used for titration; the soft liquid feeding bottle 4 is a soft plastic bottle which has good elasticity, the outer wall can be extruded to the maximum extent and can be quickly restored to the original shape, and a person skilled in the art can also select a washing bottle commonly used in a laboratory to replace the soft liquid feeding bottle 4.

It should be noted that the installation and fixation of the tip catheter 2 are accomplished by means of the connector assembly 3, the connector assembly 3 includes a cylindrical tubular connector 31 capable of radially contracting and a screw cap 32 covering the connector 31, and the connector 31 and the screw cap 32 are provided with mutually matched thread structures. It should be noted that the joint 31 includes several circular arc segments. As shown in fig. 4, in this embodiment, the joint 31 is composed of a circular base and three circular arc sections fixedly connected to the base, and the joint 31 is an integrated structure. The three arc sections form a cylindrical pipe; a certain gap is left between the three circular arc sections, and the circular arc sections can be folded towards the middle under the action of external force to narrow the diameter of the cylindrical tubular joint 31, so that the tip liquid guide pipe 2 is fixed by applying a force action. The embodiment provides external force by the aid of the screw cap 32, the screw cap 32 is a hollow circular truncated cone, a thread structure is arranged on the outer side wall of the circular arc section, and a thread structure matched with threads of the circular arc section is arranged on the inner side wall of the screw cap 32; the screw cap 32 can be sleeved on the cylindrical tubular joint 31 consisting of three circular arc sections; in the process of screwing the screw cap 32 from top to bottom, an external force is applied to the three circular arc sections to enable the three circular arc sections to radially contract, so that the tip liquid guide tube 2 is wrapped. It will be appreciated that the joint 31 is made of a plastic material having a certain deformability, so that the circular arc segment itself has a certain plasticity and can be deformed without breaking under the action of an external force.

In order to enable the joint component 3 to be installed at the pipe orifice of the burette 1 and not to fall off easily, a circular ring with a certain height or width is fixedly arranged below the base, the inner diameter of the circular ring is slightly larger than the outer diameter of the pipe orifice of the burette 1, the circular ring can be conveniently sleeved on the pipe orifice, the circular ring is made of rubber materials with certain elasticity, and under the condition that the inner diameter of the circular ring is slightly larger than the outer diameter of the pipe orifice of the burette 1, the circular ring with certain elasticity can be ensured to be sleeved at the pipe orifice and can be tightened, so that the fixing is convenient, and the joint component 3 is fixedly installed on the pipe orifice of the burette 1.

When in use, firstly, the burette 1 is arranged on the mounting frame 6, standard solution or reagent required to be used for titration is filled in the soft liquid adding bottle 4, the connector component 3 is sleeved on the pipe orifice of the burette 1, at the moment, the screw cap 32 is not connected with the connector 31, then the soft liquid adding bottle 4 and the sharp-mouth liquid guide pipe 2 are connected by adopting a latex pipe, the sharp-mouth liquid guide pipe 2 penetrates through the connector 31 to extend into the burette 1, the extending position of one end of the sharp mouth is adjusted to ensure that the position of the sharp part of the sharp-mouth liquid guide pipe is adjusted to the zero-point scale line position of the burette 1, at the moment, the screw cap 32 is rotated until the connector 31 clamps the sharp-mouth liquid guide pipe 2 to be fixed, the soft liquid adding bottle 4 is squeezed by hand to apply pressure, and the reagent is pressed into the burette 1; when the reagent added into the burette 1 exceeds the zero point, the soft liquid adding bottle 4 is restored to the original state by hands, and the excessive reagent in the burette 1 can be sucked back into the soft liquid adding bottle 4.

The automatic zero setting burette device and the use method thereof can accurately set zero, reduce the consumption of standard titration solution in the zero setting process and save reagents; whole liquid feeding process all goes on inside the device, has effectively avoided reagent solution to pour into the buret outer wall and has polluted the buret or spattered the condition that the experimenter caused the injury.

Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the present invention. Any modification, equivalent replacement, or modification made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. An automatic zero setting burette device is characterized by comprising a sharp-mouth liquid guide pipe, a burette and a connector component sleeved at the pipe orifice of the burette, wherein one end of the sharp-mouth liquid guide pipe penetrates through the connector component and extends into the burette, and the other end of the sharp-mouth liquid guide pipe is connected with a soft liquid adding bottle; the joint assembly comprises a cylindrical tubular joint capable of radially contracting and a rotary cover sleeved on the joint, and the joint and the rotary cover are provided with thread structures matched with each other; the joint comprises a plurality of arc segments.

2. The self-zeroing burette apparatus according to claim 1, wherein said joint is comprised of an annular base and three circular segments fixedly attached to the base, the three circular segments forming a cylindrical tube, said joint being of a unitary construction; the outer side wall of the arc section is provided with a thread structure, and the inner side wall of the screw cap is provided with a thread structure matched with the thread of the arc section.

3. The automatic zero setting burette device of claim 2, wherein a certain gap is left between the three circular arc sections, the screw cap is a hollow circular truncated cone, and the screw cap can be sleeved on a cylindrical tubular joint formed by the three circular arc sections; the base below sets firmly a ring that has a take the altitude, the internal diameter of ring slightly is greater than the external diameter at the burette mouth of pipe, thereby the ring cover is located the burette mouth of pipe makes joint Assembly fixed mounting in on the burette.

4. The self-zeroing burette apparatus according to claim 3, wherein said adapter is made of plastic with a certain deformability, and said ring is made of rubber material with a certain elasticity.

5. The self-zeroing burette apparatus of claim 1, wherein the external diameter of said tip catheter is slightly smaller than the internal diameter of the burette; one end of the sharp nozzle liquid guide tube extends into the burette, and the other end of the sharp nozzle liquid guide tube is communicated with the soft liquid adding bottle through the connecting tube.

6. The self-zeroing burette device of claim 1, wherein the tip liquid guide tube is made of transparent glass material, and the soft liquid feeding bottle is a soft plastic bottle.

7. The automatic zero setting burette device of claim 5, wherein the connecting tube is latex tube.

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