CN210815324U - Novel suck-back prevention pipette suction head - Google Patents

Abstract

The utility model provides a novel prevent pipette tip of suck-back, includes suction head (1), is equipped with in suction head (1) upper end and prevents suck-back device (2), prevent suck-back device (2) by with suction head (1) inner wall seamless top plate (21) of hugging closely and with suction head (1) inner wall between have the lower separation blade (22) of space to constitute, offer gas pocket (211) at both ends about a plurality of intercommunication top plate (21) on top plate (21), gas pocket (211) the outside of top plate (21) is equipped with isolation section of thick bamboo (212) that downwardly extending does not contact lower separation blade (22). The device simple structure, with low costs can effectively prevent that liquid from suck-back to pipettor, avoid polluting and extravagant, cause economic loss.

Description

Novel suck-back prevention pipette suction head

Technical Field

The utility model relates to a pipettor suction head especially relates to a novel prevent suck-back pipettor suction head.

Background

The liquid transfer device is also called a liquid transfer gun, and the basic structure is a metering tool which can transfer liquid from an original container to another container within a certain range as long as the basic structure is provided with a display scale, a volume adjusting part, a piston, a 0-shaped ring, a suction tube and the like, and is widely applied to the fields of biology, medicine, chemistry and the like. The pipette tip is a disposable consumable used with a pipette, and has huge usage in the field. In the process of using the liquid transfer device to transfer liquid, liquid suck-back can occur, the liquid flows into the liquid transfer device, other liquid can be polluted by continuous use, inconvenience is brought to an experiment, the liquid transfer device belongs to a precise instrument, the manufacturing cost is high, the liquid is not easy to clean, and the liquid suck-back can also cause certain economic loss.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems and deficiencies existing in the prior art, the utility model provides a novel suck-back prevention pipettor suction head.

The following design structure and design scheme are specifically adopted:

the utility model provides a novel prevent pipette tip of suck-back, includes suction head (1), is equipped with in suction head (1) upper end and prevents suck-back device (2), prevent suck-back device (2) by with suction head (1) inner wall seamless top plate (21) of hugging closely and with suction head (1) inner wall between have the lower separation blade (22) of space to constitute, offer gas pocket (211) at both ends about a plurality of intercommunication top plate (21) on top plate (21), gas pocket (211) the outside of top plate (21) is equipped with isolation section of thick bamboo (212) that downwardly extending does not contact lower separation blade (22).

Preferably, the anti-suck-back device (2) is arranged below the interface of the sucker (1) and is not flush with the interface, so that the pipette (3) can be conveniently connected.

Preferably, the upper baffle plate (21) and the lower baffle plate (22) are in a conical shape.

Preferably, the upper baffle plate (21) is in an inverted cone shape, the lower baffle plate (22) is in a regular cone shape, and the upper baffle plate and the lower baffle plate are symmetrically distributed.

Preferably, the upper baffle plate (21) and the lower baffle plate (22) are connected through a connecting rod (4), wherein the connecting rod (4) is solid.

Preferably, the isolation cylinder (212) is connected with the upper baffle (21) into a whole.

The working principle of the utility model is introduced as follows:

the utility model discloses a set up at suction nozzle department and prevent suck-back device, form a novel pipettor suction head of an organic whole with the suction head, realize absorbing liquid through the inside atmospheric pressure that produces of gas pocket on the separation blade to prevent through keeping apart a section of thick bamboo that liquid from flowing into the pipettor from the gas pocket, realized preventing liquid suck-back. Specifically, a structure that gas is communicated up and down is formed through an air hole (211) of an upper baffle plate (21) of the suck-back prevention device (2), the suction head (1) forms air pressure change to suck or discharge liquid under the pressing action of a liquid transfer device, the liquid is pressed into the suction head (1), the liquid level of the liquid with the capacity set in the range does not rise to the position of the lower baffle plate (22) under normal conditions, when the unfavorable condition of suck-back occurs, a large amount of liquid can be blocked by the lower baffle plate (22), a small amount of liquid passes through a gap between the lower baffle plate (22) and the inner wall of the suction head (1) and forms adsorption along the inner wall of the suction head (1), the liquid flows back to the direction of the upper baffle plate (21) under the action of the air pressure change, the upper baffle plate (21) tightly attached to the inner wall of the suction head (1) can block the liquid, and the possibility that the, the suck-back prevention effect is realized.

Compared with the prior art, the utility model produced beneficial effect is: the device simple structure, with low costs will prevent that suck-back device and suction head are made an organic whole, convenient operation, and separation blade and isolation section of thick bamboo about adopting prevent that liquid suck-back from polluting the pipettor to the pipettor, bring inconvenience for the experiment, avoid causing the unnecessary loss.

Drawings

Fig. 1 is a cross-sectional view of a novel anti-suck back pipette tip.

Fig. 2 is a schematic diagram of a novel anti-back pipette tip.

Fig. 3 is a schematic structural view of a novel suck-back prevention pipette tip.

Fig. 4 is a usage state diagram of a novel suck-back prevention pipette tip.

Fig. 5 is a schematic view of a tip structure of a novel anti-suck back pipette tip.

Reference numerals: 1-a suction head; 2-anti-suck back device; 21-an upper baffle plate; 211-air holes; 212-an isolation cylinder; 22-lower baffle plate; 3-a liquid shifter; 31-a regulating wheel; 32-a display screen; 33-unload button; 34-an elastic suction nozzle; 4-connecting rod.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

As shown in the description figure, the novel anti-suck-back pipette tip comprises a tip 1, wherein an anti-suck-back device 2 is arranged at the upper end of the tip 1, the anti-suck-back device 2 is composed of an upper baffle 21 which is seamlessly attached to the inner wall of the tip 1 and a lower baffle 22 which is provided with a gap with the inner wall of the tip 1, a plurality of air holes 211 which are communicated with the upper end and the lower end of the upper baffle 21 are formed in the upper baffle 21, and an isolation cylinder 212 which extends downwards but is not in contact with the lower baffle 22 is arranged outside the air holes 211 of the upper baffle 21.

Further, the anti-suck-back device 2 is arranged below the interface of the sucker 1 and is not flush with the interface, so that the pipette 3 can be conveniently connected.

Further, the upper flap 21 and the lower flap 22 are conical.

Further, the upper baffle 21 is in an inverted cone shape, the lower baffle 22 is in a regular cone shape, and the two are symmetrically distributed.

Further, the upper blocking piece 21 and the lower blocking piece 22 are connected through a connecting rod 4, wherein the connecting rod 4 is solid, and liquid is prevented from being sucked back to the pipettor 3 through the connecting rod.

Further, the isolation cylinder 212 is connected with the upper baffle 21 as a whole.

The specific implementation mode is as follows:

step one, installing a suction head. By adopting a rotary installation method, an experimenter vertically holds the liquid transfer device 3, inserts the elastic suction nozzle 34 of the liquid transfer device 3 into the suction head 1, slightly presses down, and simultaneously rotates the liquid transfer device 3 in the hand by 180 degrees anticlockwise, so that the phenomenon of over-violent force is avoided.

And step two, capacity setting. The laboratory technician holds the pipette 3, slowly adjusts the volume value to the desired value by the adjustment wheel 31, and confirms it again. When the value is adjusted from a large value to a small value, the operation is just right; when the value is adjusted from a small value to a large value, the adjustment is returned after half a turn, and the numerical value is displayed by the display screen 32.

And step three, prewashing the sucker. When the range of using new suction head 1 or pipettor 3 is increased, experimenters need to discharge the transferred liquid two to three times, so that a homogeneous liquid film is formed on the inner wall of the suction head 1, and the precision and accuracy of pipetting work are ensured.

And step four, imbibing. An experimenter holds the liquid transfer device 3 vertically, firstly presses the adjusting wheel 31 of the liquid transfer device 3 to a first stop point, and then vertically invades the sucker 1 into the liquid level, wherein the invasion liquid level does not need to be too deep, otherwise, the liquid absorption precision is influenced to a certain extent. The air pressure is formed by the air through the air hole 211 of the upper baffle plate 21 of the suck-back prevention device 2, the liquid is pressed into the suction head 1, under the normal condition, the liquid level of the liquid with the capacity set in the range can not rise to the position of the lower baffle plate 22, when the suck-back unfavorable condition occurs, a large amount of liquid can be blocked by the lower baffle plate 22, when the liquid is sucked into the gap between the lower baffle plate 22 and the inner wall of the suction head 1 carelessly, the liquid is blocked by the upper baffle plate 21 tightly attached to the inner wall of the suction head 1, and the liquid is blocked by the isolation cylinder 212 to flow in.

And step five, discharging the liquid. The suction head 1 is tightly attached to the wall of the container, the adjusting wheel 31 is firstly pressed to the first stop point, and after a pause is made slightly, the adjusting wheel is pressed to the second stop point, the gas is discharged through the gas hole 211, the liquid is discharged, and the two stop points and the centrum design of the double baffle pieces of the anti-suck-back device 2 can ensure that no residual liquid exists in the suction head 1, and ensure the precision and accuracy of the liquid-moving work.

And step six, unloading the suction head. The single-channel pipette presses the unloading button 33 to unload the suction head 1, and the unloaded suction head 1 cannot be mixed with a new suction head 1. The multi-channel pipettor is gently pulled out one by the hands of the experimenters and is put into the waste box for uniform treatment, and the pipettor 3 is put on the storage rack so as to be used next time.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims (6)

1. The utility model provides a novel prevent suck-back pipettor suction head, includes suction head (1), its characterized in that: the suction head (1) is provided with an anti-suck-back device (2) at the upper end, the anti-suck-back device (2) is composed of an upper baffle plate (21) which is seamlessly attached to the inner wall of the suction head (1) and a lower baffle plate (22) which is provided with a gap with the inner wall of the suction head (1), the upper baffle plate (21) is provided with a plurality of air holes (211) which are communicated with the upper end and the lower end of the upper baffle plate (21), and the outer side of the air holes (211) of the upper baffle plate (21) is provided with an isolation cylinder (212) which extends downwards but is not contacted with the.

2. The novel suck back prevention pipette tip of claim 1, wherein: the anti-suck-back device (2) is arranged below the interface of the suction head (1) and is not flush with the interface, so that the liquid transfer device (3) can be conveniently connected.

3. The novel suck back prevention pipette tip of claim 1, wherein: the upper baffle plate (21) and the lower baffle plate (22) are in a conical shape.

4. A novel anti-suck back pipette tip as defined in claim 3, wherein: the upper baffle plate (21) is in an inverted cone shape, the lower baffle plate (22) is in a regular cone shape, and the upper baffle plate and the lower baffle plate are symmetrically distributed.

5. The novel suck back prevention pipette tip of claim 4, wherein: the upper baffle plate (21) and the lower baffle plate (22) are connected through a connecting rod (4), wherein the connecting rod (4) is solid.

6. The upper baffle plate of claim 1, wherein the suction prevention pipette tip comprises: the isolation cylinder (212) is connected with the upper baffle (21) into a whole.

Images