CN216172441U

CN216172441U - Single-channel liquid transfer device

Info

Publication number: CN216172441U
Application number: CN202122862641.6U
Authority: CN
Inventors: 刘强; 何立胜; 丁保敏; 方文静; 岳克鹏; 殷世腾; 赵强; 李瑞金; 陈甜甜; 高灏杰; 朱玥
Original assignee: Henan Xinhe Medical Instrument Co ltd
Current assignee: Henan Xinhe Medical Instrument Co ltd
Priority date: 2021-11-19
Filing date: 2021-11-19
Publication date: 2022-04-05
Anticipated expiration: 2031-11-19

Abstract

The utility model discloses a single-channel pipettor, which comprises a barrel and a push rod, wherein the lower end of the push rod is inserted into the barrel, the upper end of the push rod extends to the outside of the barrel and is fixedly connected with a button, the middle part of the push rod is provided with an adjusting mechanism for adjusting the liquid absorption amount, and the lower end of the push rod is provided with a liquid absorption mechanism; the liquid suction device can set the liquid suction amount before liquid suction and then quickly suck the liquid, and is convenient to operate, high in liquid suction speed and high in efficiency; be equipped with in the pipettor suction nozzle and keep off liquid mechanism, can block inside liquid gets into the barrel under the too fast or the liquid in-process pipettor circumstances of slope of transfer liquid, spare part avoids reagent to corrode in the protection pipettor, avoids simultaneously causing the pollution to the reagent of follow-up removal.

Description

Single-channel liquid transfer device

Technical Field

The utility model relates to the technical field of pipettors, in particular to a single-channel pipettor.

Background

The liquid transfer device is a metering tool for transferring liquid from an original container to another container within a certain range, is commonly used for transferring a small amount of or trace liquid in a laboratory, is widely applied to the fields of biology, chemistry and the like, and has the working principle that liquid suction and liquid discharge are completed through volume change caused by movement of an internal piston. The existing pipettor generally sucks liquid by pulling a push rod upwards like an injector, the liquid is sucked quantitatively by the control of a hand when liquid is sucked, the liquid sucking speed needs to be slowed down when the liquid sucking numerical value is reached quickly so as to prevent the excessive liquid sucking, and once the excessive liquid sucking is performed and the liquid needs to be injected, the liquid sucking speed is slow, and the efficiency is low; in addition, some pipettors among the prior art are by pressing the button of push rod upper end, drive the piston rebound through the rebound effect and carry out the imbibition, but do not set up in the suction nozzle of pipettor among the prior art and keep off the liquid structure usually, consequently when the pipettor operation is not current, for example the imbibition is too fast, the pipettor shifts under the circumstances such as liquid in-process slope, inside liquid easily gets into the pipettor, damages internals, and if the inside liquid of entering pipettor is not in time wash, during the liquid removal again, can cause the pollution to the reagent of follow-up removal.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a single-channel pipette, which solves the problems set forth in the background art.

In order to achieve the purpose, the utility model provides the following technical scheme:

a single-channel liquid transfer device comprises a cylinder body and a push rod, wherein the lower end of the push rod is inserted into the cylinder body, the upper end of the push rod extends to the outside of the cylinder body and is fixedly connected with a button, an adjusting mechanism used for adjusting liquid absorption amount is arranged in the middle of the push rod, and a liquid absorption mechanism is arranged at the lower end of the push rod; the adjusting mechanism comprises a threaded sleeve coaxially sleeved on the outer side of the push rod, the lower end of the threaded sleeve is fixedly connected with a limiting plate, the limiting plate is connected with the barrel in a sliding manner and can slide up and down relative to the barrel, the top end of the barrel is provided with an adjusting knob in threaded connection with the threaded sleeve, and the adjusting knob is rotatably connected with the barrel; the lower end of the barrel is also provided with a suction nozzle, and a liquid blocking mechanism for preventing liquid from entering the barrel is arranged in the suction nozzle.

Furthermore, sliding grooves are formed in the inner walls of the two opposite sides of the barrel body and are arranged in the vertical direction, first sliding blocks matched with the sliding grooves are arranged on the two opposite sides of the limiting plate, and the first sliding blocks move in the length direction of the sliding grooves; the barrel upper end is equipped with the ring channel, the relative both sides fixedly connected with of adjust knob periphery wall lower extreme with ring channel complex slider two, slider two is followed the ring channel circumferencial direction removes.

Further, imbibition mechanism is including locating the piston of push rod lower extreme, piston and barrel inner wall sealing contact, fixedly connected with movable plate on the push rod, the top of movable plate is located the bottom of limiting plate, the relative both sides of movable plate be equipped with spout complex slider three, three edges of slider spout length direction removes, the movable plate with be equipped with between the piston with barrel integrated into one piece's baffle, be equipped with the through-hole that supplies the push rod to pass on the baffle, the cover is equipped with the spring on the push rod, spring one end is contradicted on the baffle, and the other end is contradicted on the movable plate.

Further, the piston with the push rod can be dismantled and be connected, be equipped with two ring type sealing washer on the piston periphery, ring type sealing washer's cross-section is the circular arc type, the cross-section of piston cut-off face is the inclined plane that the upper end inclines to the direction of being close to the piston center pin.

Furthermore, the suction nozzle comprises a cylinder section connected with the cylinder body and a hollow circular platform section arranged at the lower part of the cylinder section, the liquid blocking mechanism comprises an annular liquid blocking plate arranged at the top of the cylinder section and a circular liquid blocking groove arranged at the middle part of the cylinder section, the inner diameter of the circular liquid blocking groove is larger than the diameter of the central hole of the annular liquid blocking plate, and the circular liquid blocking groove is connected with the inner wall of the suction nozzle through a plurality of connecting rods.

Furthermore, the top end of the threaded sleeve is provided with an outer edge extending in the direction away from the central axis of the push rod.

Furthermore, a plurality of anti-skidding convex ribs are arranged on the peripheral wall of the adjusting knob.

The utility model has the beneficial effects that: the liquid suction device is internally provided with the adjusting mechanism for adjusting the liquid suction amount, the liquid suction amount can be set before liquid suction, and then liquid suction is performed quickly, so that the liquid suction device is convenient to operate, high in liquid suction speed and high in efficiency; be equipped with in the pipettor suction nozzle and keep off liquid mechanism, can block inside liquid gets into the barrel under the too fast or the liquid in-process pipettor circumstances of slope of transfer liquid, spare part avoids reagent to corrode in the protection pipettor to can avoid causing the pollution to the reagent of follow-up removal.

Drawings

Fig. 1 is a schematic structural diagram of a single-channel pipette according to the present invention;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

FIG. 3 is a top view of a cylindrical segment of the suction nozzle of the present invention;

FIG. 4 is a cross-sectional view of the nozzle of the present invention taken in the direction B-B.

Detailed Description

As shown in fig. 1-4, a single channel pipette comprises a cylinder 1 and a push rod 2 with a lower end inserted into the cylinder 1, wherein the upper end of the push rod 2 extends to the outside of the cylinder 1 and is fixedly connected with a button 3, an adjusting mechanism for adjusting the amount of liquid absorbed is arranged in the middle of the push rod 2, and a liquid absorbing mechanism is arranged at the lower end of the push rod; the adjusting mechanism comprises a threaded sleeve 4 coaxially sleeved outside the push rod 2, a limiting plate 5 is fixedly connected to the lower end of the threaded sleeve 4, the limiting plate 5 is connected with the barrel 1 in a sliding manner, can slide up and down relative to the barrel 1 and cannot rotate relative to the barrel 1, the limiting plate 5 is used for limiting the upward movement distance of the push rod 2 so as to control the liquid absorption amount, an adjusting knob 6 in threaded connection with the threaded sleeve 4 is arranged at the top end of the barrel 1, the adjusting knob 6 is rotatably connected with the barrel 1 and can rotate relative to the barrel 1 but cannot move up and down relative to the barrel 1, when the liquid absorption amount needs to be adjusted, the adjusting knob 6 is rotated, the adjusting knob 6 drives the threaded sleeve 4 to move up and down, the threaded sleeve 4 drives the limiting plate 5 to move up and down, so that the liquid absorption amount is adjusted, and the adjusting mechanism can set the liquid absorption amount before the liquid absorption amount is adjusted, the liquid can be quickly transferred, the operation is convenient, and the efficiency is high; the lower end of the barrel body 1 is further provided with a suction nozzle 7, a liquid blocking mechanism for preventing liquid from entering the barrel body 1 is arranged in the suction nozzle 7, the situation that liquid enters the barrel body 1 due to too fast liquid suction or tilting of a liquid transfer machine in the liquid transfer process is avoided, internal parts of the liquid transfer machine are protected from being corroded, and meanwhile, when liquid is transferred again, the liquid transferred last time does not enter the liquid transfer machine to pollute the liquid transferred subsequently, so that the test accuracy is ensured; preferably, the suction nozzle 7 is detachably connected to the cartridge 1, and the suction nozzle 7 can be detached for cleaning and wiping.

The inner walls of two opposite sides of the barrel body 1 are provided with sliding grooves 8, the sliding grooves 8 are arranged in the vertical direction, two opposite sides of the limiting plate 5 are provided with first sliding blocks 9 matched with the sliding grooves 8, the first sliding blocks 9 move in the length direction of the sliding grooves 8, the sliding grooves 8 are used for limiting the limiting plate 5 to rotate, and when the adjusting knob 6 is rotated, the threaded sleeve 4 cannot rotate along with the adjusting knob 6; the utility model discloses a cylinder 1, including cylinder 1,

spout

8, 6 peripheral walls, 6, two sets of adjusting knobs, cylinder 1 and spout 8, the upper end of cylinder is equipped with ring channel 10, just under the ring channel 10 terminal surface with the spout 8 up end is spaced apart each other in vertical direction, 6 peripheral walls lower extreme relative both sides fixedly connected with ring channel 10 complex slider two 11, slider two 11 are followed ring channel 10 circumferencial direction removes, and ring channel 10 is used for limiting slider 2 and reciprocates for adjusting knobs 6 can only rotate relative cylinder 1 and can not reciprocate relative cylinder 1.

The liquid suction mechanism comprises a piston 12 arranged at the lower end of a push rod 2, the piston 12 is in sealing contact with the inner wall of a cylinder 1, a moving plate 13 is fixedly connected onto the push rod 2, the top of the moving plate 13 is positioned at the bottom of the limiting plate 5, three sliders 14 matched with the sliding grooves 8 are arranged on two opposite sides of the moving plate 13, the three sliders 14 move along the length direction of the sliding grooves 8, a partition plate 15 integrally formed with the cylinder 1 is arranged between the moving plate 13 and the piston 12, a through hole 16 for the push rod 2 to pass through is arranged on the partition plate 15, a spring 17 is sleeved on the push rod 2, one end of the spring 17 abuts against the partition plate 15, the other end of the spring 17 abuts against the moving plate 13, the spring 17 is a compression spring, when the limiting plate 5 is adjusted to the uppermost end, namely, when the liquid suction amount is the maximum range, the spring 17 is not subjected to external force, and when the liquid suction amount is less than the maximum range, the spring 17 is in a compressed state, the movable plate 13 is abutted on the lower surface of the limiting plate 5 under the action of the elastic force of the spring 17, when liquid absorption is needed, the push button 3 is pressed to drive the push rod 2 to move downwards, the push rod 2 drives the movable plate 13 and the piston 12 to move downwards, the spring 17 is further compressed, after the piston 12 moves to the bottom, the button 3 is slowly loosened, under the action of the restoring force of the spring 17, the movable plate 13 moves upwards to drive the push rod 2 and the piston 12 to move upwards for liquid absorption, when the movable plate 13 is abutted on the limiting plate 5, the liquid absorption is stopped, then the pipettor is moved to a proper position, the button 3 is pressed again, after the pipettor is used, the adjusting knob 6 is rotated to set the liquid absorption amount to the maximum range, the spring 17 is in a natural state, and the service life of the pipettor is prolonged.

The piston 12 is detachably connected with the push rod 2, can be in buckled connection (as shown in figure 1) or in threaded connection (not shown in the figure), and is convenient for replacing the piston 12, two annular sealing rings 18 are arranged on the periphery of the piston 12, the annular sealing rings 18 are tightly contacted with the inner wall of the cylinder body 1 to play a sealing role, the cross sections of the annular sealing rings 18 are all arc-shaped, compared with a traditional cylindrical piston, the contact area between the piston and the inner wall of the cylinder body 1 can be reduced, the sliding force between the piston 12 and the cylinder body 1 is reduced, the phenomenon that the sliding force of the piston 12 is blocked due to overlarge sliding force in the liquid suction process to influence the liquid suction accuracy is avoided, the cross section of the punching surface 19 of the piston 12 is an inclined plane with the upper end inclined towards the direction close to the central axis of the piston 12, and compared with a punching surface with a traditional cross section being a straight surface, the contact area between the piston 12 and the inner wall of the cylinder body 1 can be further reduced, thereby further reducing the sliding force of the piston 12, and silicone oil is sprayed on the outer surface of the piston 12 and the inner wall of the cylinder 1 to ensure that the piston 12 moves smoothly.

The suction nozzle 7 comprises a cylinder section connected with the cylinder 1 and a hollow circular table section arranged at the lower part of the cylinder section, and when the liquid transfer device is used, a disposable suction head needs to be mounted on the suction nozzle 7 for liquid absorption, and the lower end of the suction nozzle 7 is arranged to be a hollow circular table shape with a large upper end diameter and a small lower end diameter, so that the disposable suction head is convenient to mount; the liquid blocking mechanism comprises an annular liquid blocking plate 20 arranged at the top of the cylinder section and a circular liquid blocking groove 21 arranged at the middle of the cylinder section, the inner diameter of the circular liquid blocking groove 21 is larger than the diameter of a central hole of the annular liquid blocking plate 20, the circular liquid blocking groove 21 is connected with the inner wall of the suction nozzle 7 through a plurality of connecting rods 22, the number of the connecting rods 22 is 4, or 3 or 5, the circular liquid blocking groove 21 and the annular liquid blocking plate 20 form a staggered blocking structure, the gas circulation is not influenced, when the liquid suction is too fast, part of liquid splashes, the splashed liquid can be blocked by the circular liquid blocking groove 21 at the center and the annular liquid blocking plate 20 at the edge, the liquid is prevented from entering the cylinder 1, when the liquid transfer device inclines in the liquid transferring process, the liquid can flow in the inclined direction, and the annular liquid blocking plate 20 is perpendicular to the inner wall of the suction nozzle 7, can block the liquid from flowing into the cylinder 1; even under special circumstances (if keep flat after pipettor imbibition), have trace liquid to get into inside barrel 1, move the liquid once more, can be blockked by circular fender cistern 21 when the trace liquid in the barrel 1 drips, can not drip to the follow-up liquid of moving and getting in, avoid reagent to pollute.

The top end of the threaded sleeve 4 is provided with an outer edge 23 extending in the direction away from the central axis of the push rod 2 and used for limiting the threaded sleeve 4 from being separated from the adjusting knob 6.

Be equipped with a plurality of protruding muscle 24 of antiskid on the 6 periphery walls of adjust knob, the frictional force between increase adjust knob 6 and the hand, convenient operation.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims

1. The utility model provides a single track pipettor, includes barrel (1) and lower extreme insert push rod (2) in barrel (1), push rod (2) upper end extends to barrel (1) outside, and fixedly connected with button (3), its characterized in that: the middle part of the push rod (2) is provided with an adjusting mechanism for adjusting the liquid absorption amount, and the lower end of the push rod is provided with a liquid absorption mechanism; the adjusting mechanism comprises a threaded sleeve (4) coaxially sleeved on the outer side of the push rod (2), a limiting plate (5) is fixedly connected to the lower end of the threaded sleeve (4), the limiting plate (5) is connected with the barrel body (1) in a sliding mode and can slide up and down relative to the barrel body (1), an adjusting knob (6) in threaded connection with the threaded sleeve (4) is arranged at the top end of the barrel body (1), and the adjusting knob (6) is rotatably connected with the barrel body (1); the lower end of the barrel body (1) is further provided with a suction nozzle (7), and a liquid blocking mechanism for preventing liquid from entering the barrel body (1) is arranged in the suction nozzle (7).

2. A single-channel pipette as defined in claim 1, wherein: sliding grooves (8) are formed in the inner walls of the two opposite sides of the barrel body (1), the sliding grooves (8) are arranged in the vertical direction, first sliding blocks (9) matched with the sliding grooves (8) are arranged on the two opposite sides of the limiting plate (5), and the first sliding blocks (9) move in the length direction of the sliding grooves (8); barrel (1) upper end is equipped with ring channel (10), adjust knob (6) periphery wall lower extreme both sides fixedly connected with relatively with ring channel (10) complex slider two (11), slider two (11) are followed ring channel (10) circumferencial direction removes.

3. A single-channel pipette as defined in claim 2, wherein: the liquid suction mechanism comprises a piston (12) arranged at the lower end of the push rod (2), the piston (12) is in sealing contact with the inner wall of the cylinder body (1), a moving plate (13) is fixedly connected to the push rod (2), the top of the moving plate (13) is positioned at the bottom of the limit plate (5), a third sliding block (14) matched with the sliding groove (8) is arranged on two opposite sides of the moving plate (13), the third sliding block (14) moves along the length direction of the sliding chute (8), a partition plate (15) which is integrally formed with the cylinder body (1) is arranged between the moving plate (13) and the piston (12), a through hole (16) for the push rod (2) to pass through is arranged on the clapboard (15), the push rod (2) is sleeved with a spring (17), one end of the spring (17) is abutted to the partition plate (15), and the other end of the spring (17) is abutted to the moving plate (13).

4. A single-channel pipette as defined in claim 3, wherein: piston (12) with push rod (2) can be dismantled and be connected, be equipped with two ring packing (18) in piston (12) periphery, the cross-section of ring packing (18) is the circular arc type, the cross-section of piston (12) cut-off face (19) is the inclined plane of upper end to being close to piston (12) center pin direction slope.

5. A single-channel pipette as defined in claim 1, wherein: the suction nozzle (7) include with the cylinder section that cylinder (1) is connected with locate the hollow circular platform section of cylinder section lower part, keep off liquid mechanism including locating annular fender liquid board (20) at cylinder section top and locating circular fender liquid groove (21) at cylinder section middle part, circular fender liquid groove (21) internal diameter is greater than the diameter of annular fender liquid board (20) centre bore, just circular fender liquid groove (21) through a plurality of connecting rods (22) with suction nozzle (7) inner wall connection.

6. A single-channel pipette as defined in claim 1, wherein: the top end of the threaded sleeve (4) is provided with an outer edge (23) extending in the direction away from the central axis of the push rod (2).

7. A single-channel pipette as defined in claim 1, wherein: the adjusting knob (6) is provided with a plurality of anti-skidding convex ribs (24) on the peripheral wall.