CN213434534U

CN213434534U - Wide-range anti-pollution liquid transfer device

Info

Publication number: CN213434534U
Application number: CN201922243768.2U
Authority: CN
Inventors: 何美美; 葛云霄; 焦灿; 高冠赏
Original assignee: Zhengzhou University
Current assignee: Zhengzhou University
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2021-06-15
Anticipated expiration: 2029-12-13

Abstract

The patent of the utility model belongs to the experimental device field relates to an anti-pollution pipettor of wide range, including moving the liquid module, anti-pollution module, its characterized in that: the pipetting module comprises a coarse adjustment part and a fine adjustment part, wherein the coarse adjustment part comprises a movable sliding block, a slideway and a piston rod, and is characterized in that the movable sliding block is fixed in the middle of the piston rod, so that the piston rod only moves along the slideway in the axial direction; the fine adjustment part comprises a fine adjustment rotary valve, a nut and a screw rod, and is characterized in that the nut is fixed on the fine adjustment rotary valve and is in threaded fit with the screw rod, and the screw rod can move axially by rotating the nut, so that fine adjustment is realized. The anti-pollution module consists of a liquid storage bin, an isolating liquid channel and an adjusting channel, and is characterized in that the isolating liquid channel is connected with the liquid storage bin and the adjusting channel, so that the isolating liquid in the liquid storage bin flows into the adjusting channel, and the pipettor is prevented from being polluted by volatilization of liquid. The wide-range anti-pollution liquid transfer device is high in precision and simple in structure, and can prevent liquid from volatilizing and polluting to a certain extent.

Description

Wide-range anti-pollution liquid transfer device

Technical Field

The utility model belongs to the experimental device field especially relates to an anti-pollution pipettor of wide range.

Background

The liquid transfer device is a liquid transfer device widely applied to biological, chemical and medical laboratories, and can realize quantitative transfer of liquid. At present, pipettes on the market can be divided into a gas piston type pipettor and an external piston type pipettor in principle, and the two pipettors have advantages respectively, but have some problems in the actual use process. The former can cause cross contamination when transferring volatile liquid, and the latter can prevent aerosol cross contamination, but its external piston and capillary suction pipe are all disposable, and this kind of pipettor can cause the serious waste of resource when using in a large number, is unfavorable for energy-concerving and environment-protective. In addition, at present, pipettes on the market are mostly suitable for transferring a small amount of or trace liquid, and when the volume of the liquid to be transferred is slightly larger, only other appliances can be used, so that the transferring precision cannot be guaranteed.

Disclosure of Invention

For solving the problem that present pipettor range is little, easily cause cross contamination in the use, the utility model provides an anti-pollution pipettor of wide range. The pipettor can enlarge the measuring range on the premise of ensuring the pipetting precision and prevent the pollution of volatile liquid to the pipettor.

In order to achieve the above object, the utility model adopts the following technical scheme:

a wide-range anti-pollution pipettor, its characterized in that: the device comprises a shell (1), a fine adjustment rotary valve (2), a piston rod (3), a threaded rod (4), a fixed valve (5), a sealing cap (6), a nut (7), a movable sliding block (8), a slide way (9), a spring (10), a liquid storage bin (11), an isolation liquid channel (12) and an adjusting channel (13); a slide way (9) is arranged on the inner side of the shell (1), and the shell (1) clamps the movable sliding block (8) so that the movable sliding block (8) can only move axially in the slide way (9); one end of the spring (10) is fixed in the shell (1), and the other end of the spring is fixed on the movable sliding block (8); the lower end of the piston rod (3) is inserted into the adjusting channel (13) and is in interference fit with the adjusting channel, and the upper end of the adjusting channel (13) is sealed; the nut (7) is in threaded connection with the threaded rod (4); the sealing cap (6) is plugged into the upper end of the liquid storage bin (11) to seal the upper end of the liquid storage bin (11).

Furthermore, the middle part of the piston rod (3) is provided with a square hole, the movable sliding block (8) penetrates through the square hole and is in interference fit with the square hole, and the piston rod (3) can only move along the axial direction through the limitation of the movable sliding block (8).

Further, the upper end of the fine adjustment rotary valve (2) is provided with a regular hexagon groove, and the nut (7) is fixed on the fine adjustment rotary valve (2) through interference fit with the regular hexagon groove.

Further, the center of the threaded rod (4) is axially penetrated through by a square hole, the piston rod (3) is in clearance fit with the square hole, the upper half part of the threaded rod (4) is provided with a radial penetrating threaded hole, and the fixed valve (5) is in threaded connection with the radial threaded hole.

Further, the isolating liquid channel (12) is connected with the liquid storage bin (11) and the adjusting channel (13).

The utility model has the advantages that:

1. the piston rod (3) and the fine adjustment rotary valve (2) are used for coarse adjustment and fine adjustment respectively, and the range of the liquid transfer device is enlarged on the premise of ensuring the precision.

2. The liquid to be removed is isolated from the air in the liquid transferring device through the isolating liquid, so that the volatile liquid is prevented from volatilizing to pollute the liquid transferring device.

Drawings

Fig. 1 is a front view of a wide-range anti-contamination pipette.

Fig. 2 is a cross-sectional view of a wide-range anti-contamination pipette.

In the drawings:

1-shell, 2-fine adjustment rotary valve, 3-piston rod, 4-threaded rod, 5-fixed valve, 6-sealing cap, 7-nut, 8-movable slide block, 9-slideway, 10-spring, 11-liquid storage bin, 12-isolating liquid channel, 13-adjusting channel and 14-isolating liquid.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 2, an anti-contamination module of a wide-range anti-contamination pipetting device includes: the device comprises a sealing cap (6), a liquid storage bin (11), a spacer fluid channel (12) and an adjusting channel (13). The sealing cap (6) is plugged into the upper end of the liquid storage bin (11) to seal the upper end of the liquid storage bin (11). The isolating liquid channel (12) is connected with the liquid storage bin (11) and the adjusting channel (13), and isolating liquid (14) capable of dissolving volatile liquid is stored in the liquid storage bin (11). The sealing cap (6) is taken down before liquid is taken, the pressure difference between the interior of the liquid storage bin (11) and the outside disappears due to the fact that the liquid storage bin (11) is communicated with the atmosphere, so that the isolating liquid (14) flows to the adjusting channel (13) through the isolating liquid channel (12), when the isolating liquid (14) flows out of the adjusting channel (13) under the action of gravity, the lower portion of the adjusting channel (13) is filled with the isolating liquid (14), and the inner space of the adjusting channel (13) is isolated from the outside. At this time, the sealing cap (6) is covered, and the liquid storage bin (11) forms pressure difference with the outside again, so that the isolating liquid (14) is not moved due to the external interference force. When the liquid transfer device is matched with a suction nozzle to suck liquid, the isolating liquid (14) isolates the inner space of the adjusting channel (13) from the outside air, so that the liquid is prevented from entering the liquid transfer device to pollute the liquid after being volatilized.

As shown in fig. 2, a pipetting module of a wide-range contamination-preventive pipette includes: the device comprises a shell (1), a fine adjustment rotary valve (2), a piston rod (3), a threaded rod (4), a fixed valve (5), a nut (7), a movable sliding block (8), a slide way (9) and a spring (10). A slide way (9) is arranged on the inner side of the shell (1), and the shell (1) clamps the movable sliding block (8) so that the movable sliding block (8) can only move axially in the slide way (9); the middle part of the piston rod (3) is provided with a square hole, the movable sliding block (8) penetrates through the square hole and is in interference fit with the square hole, and the piston rod (3) can only axially move under the limitation of the movable sliding block (8); the lower end of the piston rod (3) is inserted into the adjusting channel (13) and is in interference fit with the adjusting channel, and the upper end of the adjusting channel (13) is sealed; one end of the spring (10) is fixed on the inner side of the shell (1), and the other end of the spring is fixed on the movable sliding block (8), so that the movable sliding block (8) can automatically reset after moving; the upper end of the fine adjustment rotary valve (2) is provided with a regular hexagonal groove, and the nut (7) is fixed on the fine adjustment rotary valve (2) through interference fit with the regular hexagonal groove; the nut (7) is in threaded connection with the threaded rod (4); the center of the threaded rod (4) is axially penetrated through by the square hole, the piston rod (3) is in clearance fit with the square hole, the upper half part of the threaded rod (4) is provided with a radial penetrating threaded hole, and the fixed valve (5) is in threaded connection with the radial threaded hole. The pipetting process is completed through two steps of rough adjustment and fine adjustment, during the rough adjustment, the piston rod (3) is pulled to move upwards in the axial direction, and due to the air pressure difference formed between the upper end seal of the adjusting channel (13) and the outside, the isolating liquid (14) in the adjusting channel (13) also moves upwards, so that the air pressure difference required by pipetting is manufactured. When the amount of liquid taken by rough adjustment is close to the required amount, fine adjustment is started, and the fixed valve (5) is fastened in a suspending way and moves along a radial threaded hole of the threaded rod (4), so that the side wall of the piston rod (3) is pressed tightly, and the piston rod (3) and the threaded rod (4) are fixed together. At the moment, the fine adjustment rotary valve (2) is rotated to enable the fine adjustment rotary valve to rotate with a fixed nut (7), due to the limitation of the movable sliding block (8), the threaded rod (4) can only move axially, the piston rod (3) moves slightly in the axial direction under the driving of the threaded rod (4), and the piston rod (3) can move to the position capable of accurately sucking liquid through adjusting the fine adjustment rotary valve (2), so that the liquid transferring process is completed. The spacer fluid (14) acts as the actual piston to suck up the fluid throughout the process.

Finally, it should be noted that: although the present apparatus has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present device shall be included in the protection scope of the present device.

Claims

1. A wide-range anti-pollution pipettor, its characterized in that: the device comprises a shell (1), a fine adjustment rotary valve (2), a piston rod (3), a threaded rod (4), a fixed valve (5), a sealing cap (6), a nut (7), a movable sliding block (8), a slide way (9), a spring (10), a liquid storage bin (11), an isolation liquid channel (12) and an adjusting channel (13); a slide way (9) is arranged on the inner side of the shell (1), and the shell (1) clamps the movable sliding block (8) so that the movable sliding block (8) can only move in the slide way (9) along the axial direction; one end of the spring (10) is fixed in the shell (1), and the other end of the spring is fixed on the movable sliding block (8); the lower end of the piston rod (3) is inserted into the adjusting channel (13) and is in interference fit with the adjusting channel, and the upper end of the adjusting channel (13) is sealed; the nut (7) is in threaded connection with the threaded rod (4); the sealing cap (6) is plugged into the upper end of the liquid storage bin (11) to seal the upper end of the liquid storage bin (11).

2. The wide-range antipollution pipette according to claim 1, wherein a square hole is formed in the middle of the piston rod (3), the movable slider (8) is in interference fit with the square hole, and the piston rod (3) can only move axially under the limitation of the movable slider (8).

3. A wide-range antipollution pipette according to claim 1, characterized in that the fine adjustment tap (2) is provided at its upper end with a regular hexagonal recess, and the nut (7) is fixed to the fine adjustment tap (2) by interference fit with the regular hexagonal recess.

4. The large-range antipollution pipette according to claim 1, characterized in that the threaded rod (4) is axially penetrated by a square hole in the center, the piston rod (3) is in clearance fit with the square hole, the upper half part of the threaded rod (4) is provided with a radial through threaded hole, and the fixed valve (5) is in threaded connection with the radial threaded hole.

5. A wide-range antipollution pipette according to claim 1, characterized in that the spacer liquid channel (12) connects the reservoir (11) and the regulating channel (13).