CN206535565U - A kind of pipette - Google Patents

Abstract

The utility model discloses a pipette, which belongs to the technical field of chemical experiment instruments, and comprises an ear washing ball, a pipette body, a glass tube, and a glass ball. The glass tube is connected to the pipette body through the side four-way rubber tube. The side four-way rubber tube includes the main pipe, the upper branch pipe and the lower branch pipe. The upper branch pipe, the lower branch pipe and the pipette between the upper branch pipe and the lower branch pipe The main pipes are equipped with glass balls, and the glass balls are interference fit with the upper branch pipe, the lower branch pipe and the main pipe between the upper branch pipe and the lower branch pipe.

Description

a pipette

technical field

The utility model belongs to the technical field of chemical experiment instruments, in particular to a pipette.

Background technique

In the process of chemical experiments, it is often necessary to use a pipette to accurately pipette a certain amount of reagents. The pipettes currently used are generally composed of two parts: a pipette and an ear washing ball. For the separated device, when using a pipette to measure the solution, first align the tip of the earwashing ball with the upper mouth of the pipette and stick it tightly, and squeeze the earwashing ball to create a negative pressure inside the pipette so that the pipette can move from Extract the solution from the reagent bottle. After absorbing the solution, you need to press the top of the pipette with your finger, and adjust the amount of solution by creating a gap between the finger and the top of the pipette. The manual connection is unstable, resulting in an unstable process of measuring the solution and inconvenient operation.

In order to solve the above problems, the utility model with the authorized notification number CN 204672298 U discloses an easy-to-operate pipette, which is composed of an ear washing ball, an elastic tee hose, a glass tube, and a glass ball pipette. The lower end of the ear washing ball is the rubber hose interface, which is connected with the glass tube. The three-way rubber tube connects the glass tube with the pipette. The three-way rubber tube is composed of a main pipe and a branch pipe. The branch pipe is equipped with a horizontal glass ball. There are longitudinal glass balls, when in use, squeeze the main pipe at the position of the longitudinal glass ball to form a gap between the main pipe and the glass ball, squeeze the ear washing ball to cause negative pressure in the ear washing ball, and insert the pipette into the reagent bottle Below the liquid level, squeeze the main tube at the vertical glass bulb again to absorb the liquid. After the suction is completed, loosen the main tube at the vertical glass bulb, adjust the liquid level and perform subsequent discharge by squeezing the branch tube at the horizontal glass bulb. The pipette forms a valve structure through the cooperation of the rubber tube and the glass ball, which improves the stability of the pipette to measure the solution, and facilitates and simplifies the operation of the pipette. Second extrusion, so the volume of the ear washing ball used is required to be not less than the pipette volume, resulting in poor versatility of the ear washing ball. At the same time, it must be ensured that the amount of gas squeezed out is not The amount of liquid that needs to be pipetted is less than the amount of liquid that needs to be pipetted, and the process of squeezing the ear washing ball is subjective and arbitrary, especially when using a larger pipette, it is even more difficult to ensure the success of one-time liquid extraction.

Utility model content

The purpose of the utility model is to provide a pipette that can squeeze the ear washing ball multiple times during use, and is stable in operation and convenient for taking liquid.

The technical solution of the utility model is a pipette, which includes an ear washing ball, a pipette body, a glass tube, and a glass ball. The side four-way rubber tube is connected to the upper port of the pipette body. The side four-way rubber tube includes a main pipe, an upper branch pipe and a lower branch pipe. A glass ball, the glass ball is interference fit with the upper branch pipe, the lower branch pipe and the main pipe between the upper branch pipe and the lower branch pipe.

Preferably, in the pipette described in the present utility model, the pipette body is provided with an anti-spill device, and the anti-spill device includes an enlarged anti-spill device arranged above the marking line of the pipette body. The anti-overflow chamber is provided with a float valve, which blocks the upper port of the anti-overflow chamber when the float valve is at the highest point, and a gas-liquid channel exists between the float valve and the lower port of the anti-overflow chamber when the float valve is at the lowest point.

Preferably, in the pipette described in the present utility model, the upper end of the anti-overflow cavity is a round mouth, the lower end is an oval mouth, the float valve is a sphere, and the diameter of the float valve is larger than the circle mouth diameter, and is between the length of the major axis and the length of the minor axis of the elliptical closure.

Preferably, in the pipette described in the present utility model, the float valve includes a supporting plate, and the supporting plate is provided with a hemispherical plug, and the diameter of the plug is larger than the diameter of the upper port of the overflow prevention cavity, The diameter of the lower port of the anti-overflow cavity is between the diameter of the plug and the diameter of the supporting plate, and the supporting plate is provided with a gas-liquid through hole at the periphery of the plug.

Preferably, in the pipette described in the present invention, the float valve is made of polytetrafluoroethylene.

During the use of the pipette described in the technical solution of the utility model, the negative pressure caused by squeezing the ear washing ball for the first time is not enough to absorb enough liquid, and a second liquid absorption is required. At this time, keep the main tube and the glass The space between the balls, the lower branch pipe and the glass ball is sealed. By squeezing, a gap is formed between the upper branch pipe and the glass ball. At the same time, the ear washing ball is squeezed to make the inside of the ear washing ball a negative pressure state, and then the upper branch pipe and the glass ball Sealing, through extrusion to form a gap between the main pipe and the glass ball to absorb liquid, when the absorbed liquid makes the float valve rise to the highest point of the anti-overflow chamber, the float valve seals the upper end of the anti-overflow chamber, and the liquid does not rise, avoiding excessive liquid suction , corrode the side four-way rubber hose and ear wash ball, and finally adjust the liquid volume by squeezing to form a gap between the lower branch pipe and the glass ball, and perform subsequent liquid discharge.

Beneficial effects of the utility model technology:

The technical scheme of the utility model uses the combination of the side four-way rubber tube and the glass ball, so that the pipette can be squeezed multiple times according to the actual needs to cause negative pressure during use, so as to absorb liquid for many times and ensure the suction When the pipette is combined, any size ear wash ball and pipette can be used together, which has high versatility. The anti-spill device is set to avoid sucking too much liquid overflowing into the four-way side The rubber hose and ear cleaning ball can improve the service life of the side four-way rubber hose and the ear cleaning ball.

Description of drawings

Fig. 1 is the structural representation of the first embodiment of the utility model,

Fig. 2 is the structural representation of the second embodiment of the utility model,

Fig. 3 is the structural representation of float valve in the second embodiment,

FIG. 4 is a top view of FIG. 3 .

detailed description

In order to make it easier for those skilled in the art to understand the technical solution of the utility model, the technical solution of the utility model is further described in conjunction with the accompanying drawings.

A pipette as shown in Figure 1 and Figure 2, comprising an ear cleaning ball 1, a pipette body 2, a glass tube 3, and a glass ball, the lower end of the ear cleaning ball 1 is a hose interface, and the rubber hose The interface is connected with the glass tube 3, and the glass tube 3 is connected with the upper port of the pipette body 2 through the side four-way rubber tube 4 made of elastic material. The side four-way rubber tube 4 includes the main pipe 5, the upper branch pipe 6 and the lower Branch pipe 7, the upper branch pipe 6, the lower branch pipe 7 and the main pipe 5 between the upper branch pipe 6 and the lower branch pipe 7 are provided with glass balls, and the glass balls are connected with the upper branch pipe 6, the lower branch pipe 7 and the upper branch pipe 6 and the lower branch pipe 7. The 5 places of the main pipe between the lower branch pipes 7 are all interference fit.

The pipette body 2 is provided with an anti-spill device, and the anti-spill device includes an enlarged anti-spill chamber 8 arranged above the marking line 14 of the pipette body 2, and the anti-spill chamber 8 is provided with The float valve 9 made of polytetrafluoroethylene, when the float valve 9 is at the highest point, blocks the upper port of the anti-overflow chamber 8, and when the float valve 9 is at the lowest point, there is a gap between the float valve 9 and the lower port of the anti-overflow chamber 8 Gas-liquid channel.

Fig. 1 is the first embodiment of a pipette described in the utility model, in this embodiment, the upper end of the overflow prevention chamber 8 is a round mouth, and the lower end is an oval mouth, and the float valve 9 is a ball , the diameter of the float valve 9 is greater than the diameter of the circular shut-off, and is between the length of the major axis and the length of the short axis of the oval shut-off.

Fig. 2 is a second embodiment of a pipette described in the present invention, the float valve 9 in this embodiment includes a supporting plate 10, and the supporting plate 10 is provided with a hemispherical plug 11, the The diameter of plug 11 is greater than the diameter of the port on the anti-overflow chamber 8, and the diameter of the port under the anti-overflow chamber 8 is between the diameter of the supporting plate 10 and the diameter of the plug 11, and the supporting plate 10 is located at the position of the plug 11 periphery. Gas-liquid through hole 12 is arranged.

Before the pipette described in the utility model is used, the ear washing ball 1, the glass tube 3 and the upper branch pipe 6, the lower branch pipe 7, and the 5 places of the main pipe between the upper branch pipe 6 and the lower branch pipe 7 are all equipped with glass ball edge four-way The rubber tube 4 is connected with the pipette body 2 in a split structure. When in use, the end of the main tube 5 of the side four-way rubber tube 4 away from the ear cleaning ball 1 is combined with the pipette body 2, and then the liquid can be pipetted; no matter Regardless of the specifications of the ear wash ball 1 and the pipette body 2, they can be used together. During use, when the negative pressure caused by squeezing the ear wash ball 1 is not enough to absorb enough liquid, keep the main tube 5 and the glass pipette. The ball is sealed. By squeezing the upper branch pipe 6 and the glass ball to form a gap, the ear washing ball 1 can be squeezed again to form a negative pressure and continue to absorb liquid. The anti-spill device is installed to avoid excessive liquid absorption. The four-way rubber hose 5 and the ear washing ball 1 overflowing into the side cause corrosion and reduce their service life.

The technical solution of the utility model has exemplarily described the utility model above in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited by the above-mentioned method, as long as various non- Substantial improvements, or direct application of the ideas and technical solutions of the utility model to other occasions without improvement are all within the protection scope of the utility model.

Claims (5)

1. a kind of pipette, including ear washing bulb, liquid relief tube body, glass tube, glass marble, the ear washing bulb lower end connects for sebific duct Mouthful, the sebific duct interface is connected with glass tube, it is characterised in that the glass tube passes through on side four-way sebific duct and liquid relief tube body Port is connected, and the side four-way sebific duct includes supervisor, upper branch pipe and lower branch line, the upper branch pipe, lower branch line and positioned at upper branch pipe Appropriate department between lower branch line is equipped with glass marble, and the glass marble is with upper branch pipe, lower branch line and positioned at upper branch pipe and lower branch line Between appropriate department be interference fitted.

2. a kind of pipette according to claim 1, it is characterised in that the liquid relief tube body is filled provided with seepage prevention Put, the Anti-exudation apparatus includes being arranged on the anti-overflow chamber expanded above liquid relief tube body graticule, and the anti-overflow intracavitary is provided with Float valve, the float valve blocks anti-overflow chamber upper port when being located at peak, when float valve is located at minimum point, float valve and anti-overflow chamber lower port Between there is gas-liquid channel.

3. a kind of pipette according to claim 2, it is characterised in that the upper end of the anti-overflow chamber for it is circular close up, under Hold and closed up for ellipse, the float valve is spheroid, and the diameter of the float valve is more than circular closing in diameter, and is closed up between ellipse Between long axis length and minor axis length.

4. a kind of pipette according to claim 2, it is characterised in that the float valve includes setting on supporting plate, the supporting plate There is hemispherical plug, the diameter of the plug is more than the diameter of anti-overflow chamber upper port, and the diameter of anti-overflow chamber lower port is between supporting plate Between diameter and plug diameter, the position that supporting plate is located at plug periphery is provided with gas-liquid through hole.

5. a kind of pipette according to claim any one of 2-4, it is characterised in that the float valve is by polytetrafluoroethylene (PTFE) system Into.