CN2704843Y - Miniature liquid transferring devices - Google Patents

Abstract

The utility model belongs to the precision measuring device relating to the micro-liquid transferring device used for sampling and liquid feeding, comprising a liquid sucking rod with a liquid sucking opening, an opening driving sleeve with a small pressing palm sheathed on the liquid sucking rod, a handle sheathed on the opening driving sleeve to serve as an outer shell and a plunger piston which can reciprocally move in an inner cavity. The inner cavity of the liquid transferring device is divided into a front cavity and a back cavity and the two cavities are isolated by an O-shaped sealing ring and the liquid sucking rod is communicated with the front cavity. The plunger piston is arranged between the front cavity and the back cavity and is also fixedly arranged on the quantity adjusting screw rod arranged in the inner cavity. The quantity adjusting screw rod is screwed into an adjusting screw nut and inlaid into the handle. The adjusting screw nut can reciprocally move in the sliding slot arranged in the inner portion of the handle along the axle direction. The front end of the quantity adjusting threaded rod is provided with a middle spring and the back end is provided with an upper spring and is also screwed into an adjusting screw sleeve. The quantity adjusting screw rod is sheathed with a counter. The corresponding portion of the front side of the handle and the counter is provided with a reading window. The quantity adjusting screw rod is in the inner cavity of the liquid transferring device and can move and back rotate along the axle direction.

Description

Micropipettor

Technical field

The utility model belongs to accurate measuring device, relates to being used for chemical experiment and biochemical analysis is done the sampling of micro liquids such as blood and the apparatus of liquid feeding, and specifically, be a kind of micropipettor.

Background technology

Pipettor divides quantitatively and adjustable two kinds for measuring the formula weight device.Initial pipettor is by the imbibition nozzle push rod is not set thereon, after finishing, liquid to be moved also needs manually imbibition nozzle to be taken off from the imbibition bar, i.e. the infection that makes operating personnel be subjected to being moved liquid easily, simultaneously, easily make again and moved liquid and polluted, it is also inconvenient to operate.Though the pipettor after the improvement has increased the push rod of imbibition nozzle, because the machining precision of its piston is not high, sealing effectiveness is bad, can only realize coarse adjustment, and therefore, reliability is not high.

Recently improved pipettor, the trace of its liquid level are regulated to be needed to realize right angle conversion by a pair of conical gear that is provided with in it, and only the parts of a pipettor are just nearly 40 several, and the cumulative errors of part processing make the precision of pipettor be difficult to be guaranteed.

Summary of the invention

For overcoming the deficiency of pipettor in the prior art, the utility model provides a kind of micropipettor, and it moves liquid measure and is determined by plunger mobile distance in plunger bushing of a no-float.Utilize air displacement principle, in plunger bushing, make to decide Cheng Yundong, produce negative pressure, suck quantitative liquid by plunger.The parts of instrument itself reduce by half relatively, and it moves the liquid capacity and can clearly show in the window of device body, by hand push button clockwise or be rotated counterclockwise, i.e. and scalable and reach required capacity.The degree of accuracy of moving liquid can satisfy the selection of user to the different capabilities value in the normal capacity scope.

The technical scheme that its technical matters that solves the utility model adopts:

A kind of micropipettor, comprise the imbibition bar that has liquid sucting port, be sleeved on the imbibition bar and have little driving muzzle, be set in the shell that drives double as handle on the muzzle by hand, its substantive distinguishing features is, the inner chamber of described pipettor is divided into former and later two positions in storehouse, and is isolated by the O RunddichtringO between two storehouses; Described imbibition bar is connected with Qian Cang, plunger is arranged between forward and backward two storehouses and is fixedly mounted on the accent amount screw rod that is arranged in inner chamber, accent amount screw rod screws in the adjustment nut and embeds on the handle of double as shell, axially reciprocating in the chute that the adjustment nut can be established in handle; The front end of described accent amount screw rod is installed medi-spring and is hit by a bullet spring abutment and location cover for seat, its rear end is installed spring and upper spring seat and is screwed in and adjusts in the swivel nut, go back suit one counter on the accent amount screw rod, housing is positive to be provided with a window as reading with the counter corresponding section, and accent amount screw rod can turn round around its axis again along its axial-movement in the inner chamber of pipettor.

Compared with prior art, the utlity model has following beneficial effect:

1, because of the parts of the utility model instrument itself relatively prior art reduce by half, make its structure more reasonable, the apparatus measures error of having avoided the accumulative total mismachining tolerance because of parts to be caused to a great extent.

2, adopt the counter of forming by parts such as digital gears, make that to be moved the liquid capacity demonstration accurate, clear.Micropipettor can be regulated the capacity that is moved liquid continuously between 0.5-5000ul, its capacity permissible error is 0.3%-10%, and reproducibility error is 0.15%-3.0%, meets national standard fully.

3, the utility model good airproof performance, the reliability height does not have gas leak phenomenon under the pressure of 0.04Mpa, meet national standard fully.

4, its screw rod is regulated and is adopted uniform cross section and linear, makes good looking appearance, comfortable feel.Can be widely used in the chemistry, biochemical analysis of departments such as medicine, chemical industry and scientific research.

Description of drawings

Fig. 1 is the utility model contour structures synoptic diagram;

Fig. 2 is the utility model inner structure synoptic diagram.

Among the figure, 1. imbibition bar; 2. drive muzzle; 3. plunger; 4.O RunddichtringO; 5. the spring abutment of being hit by a bullet; 6. location cover for seat; 7. counter; 8. adjustment nut; 9. adjustment swivel nut; 10. the handle of double as shell; 11 handle cover plates; 12. button cover; 13. button; 14. adapter sleeve; 15. the little hand of pressing; 16. upper spring seat; 17. upper spring; 18. accent amount screw rod; 19. little spring; 20. medi-spring; 21. imbibition nozzle; 22. lower spring; 23. meter reading window.

Embodiment

Below in conjunction with drawings and Examples the utility model is described in further detail.

Micropipettor as shown in Fig. 1,2, comprise the imbibition bar 1 that has liquid sucting port, be sleeved on the imbibition bar 1 and have little by hand 15 drive muzzle 2, be set in the handle 10 that drives double as shell on the muzzle 2 and can be in inner chamber reciprocating plunger 3, the inner chamber of described pipettor is divided into former and later two positions in storehouse, and is isolated by O RunddichtringO 4 between two storehouses; Described imbibition bar 1 is connected with Qian Cang, plunger 3 is arranged between forward and backward two storehouses and is fixedly mounted on the accent amount screw rod 18 that is arranged in inner chamber, accent amount screw rod 18 screws in the adjustment nut 8 and embeds on the handle 10 of double as shell, axially reciprocating in the chute that adjustment nut 8 can be established in handle 10; The front end of described accent amount screw rod 18 is installed medi-spring 20 and be hit by a bullet spring abutment 5 and location cover for seat 6, and its rear end is installed spring 17 and upper spring seat 16 and screwed in and adjusts in the swivel nut 9; Suit one digital gear counter 7 on the described accent amount screw rod 18, the front of the handle 10 of double as shell and counter 7 corresponding sections are provided with a window 23 as reading, and accent amount screw rod 18 can turn round around its axis again along its axial-movement in the inner chamber of pipettor.Described driving on muzzle 2 inwalls, the position that is positioned at preceding storehouse is provided with a lower spring 22, is provided with a little spring 19 near little by hand 15 places.

Former and later two positions in storehouse that the pipettor inner chamber is divided, wherein, preceding storehouse is an air releasing bin, and back storehouse is the adjustment storehouse of a mechanical transmission motion, isolated between forward and backward two storehouses by sealing mechanism, there is a high precision stainless steel plunger 3 doing a straight reciprocating motion in the inner chamber.The diameter of its stroke and plunger 3 forms a spatial volume, is converted to the volume of suction air, and this volume is the volume of suction liquid just.

Plunger 3 is fixedly mounted on the accent amount screw rod 18, and on accent amount screw rod 18 counter 7 of suit, accent amount screw rod 18 whenever advances or a slow astern process, counter 7 just reflects a numeral, this numeral is just represented the capacity of 1ul.

Accent amount screw rod 18 screws in the accent amount nut 8, and is embedded in the handle 10, and accent amount nut 8 can only be reciprocating in the chute of handle, can not rotate.This has just controlled the relative displacement relation between accent amount screw rod 18 and the accent amount nut 8.

Medi-spring 20 is installed and is hit by a bullet spring abutment 5 and location cover for seat 6 at the front end of accent amount screw rod 18.Thereby fixed the supporting-point of handle 10 and storehouse, accent amount screw rod 18 back front ends, and accent amount screw rod 18 advances under external force, remove the external force effect after, make it to reset by upper spring 17 effects.

Install spring base 16 and upper spring 17 in the rear end of accent amount screw rod 18, screw in again and adjust in the swivel nut 9, thereby controlled between the motor area of whole adjustment screw rod 18.And also played supporting role in the rear end of adjusting screw rod 18.

Adapter sleeve 14 and button cover 12 and button 13 are installed in the rear end of accent amount screw rod 18, are added handle cover plate 11, so just finished the motion overall process of each parts of pipettor internal control.Rotational button 13 has just been known the capacity of needs suction liquid according to the reading of counter 7.

Install imbibition bar 1 and lower spring 22 and 0 RunddichtringO 4 that has liquid sucting port at the front end of handle 10, put and drive the inner chamber that muzzle 2 skewers are gone into handle 10, this front end of just having finished pipettor is installed.

The little spring 19 of packing in the rear end of handle 10, reinstall little press hand 15 after, whole pipettor promptly accused all and installed.

When using pipettor, put imbibition nozzle 21, can operate suction liquid, behind stand-by the finishing, press the little hand 15 of pressing, removal imbibition nozzle 21 is decontroled the little hand 15 of pressing, and makes it to reset, and has promptly finished whole work of suction liquid.

Before moving liquid, first rotary knob 13 land are adjusted to the position for the treatment of suction liquid value in the position, measured point with it, imbibition nozzle 21 is immersed moved 2～3mm place below the liquid levels again, and repeatedly imbibition and discharge opeing makes pipettor chamber inner and outer air pressure consistent.

During imbibition, vertically hold pipettor, button 13 is pressed first halt, (be that button 13 promotion accent amount screw rods 18 are advanced forward, medi-spring 20 surrenders drive plunger 3 simultaneously forward, the position of running into location cover for seat 6 when the end face of accent amount screw rod 18 is first halt, plunger 3 volume and its formed spaces of stroke in preceding storehouse own are the volume for the treatment of the imbibition body), and imbibition nozzle 21 immersed moved 2～3mm under the liquid levels, loosen button 13 more lentamente, make it to reset, wait was taken out pipettor after 1～2 second from liquid, just finished the imbibition process one time.

During discharge opeing, imbibition nozzle 21 is moved on the application of sample chamber wall, lentamente button 13 is pressed first halt, after treating for 1～2 second, again button 13 is pressed terminating point fully, (be about to accent amount screw rod 18 and continue to push ahead on the basis of first halt, upper spring seat 16 promotes upper spring 17 and makes it surrender, front end location cover for seat 6 contacts with the spring abutment 5 of being hit by a bullet, and is terminating point until arriving the bottom.Button 13 is pressed first halt is intended to discharged liquid, again button 13 is pressed terminating point and then be intended to liquid is drained), loosen button 13 again, make it to reset, promptly finish the pipetting process one time.

Claims (3)

1, a kind of micropipettor, comprise the imbibition bar that has liquid sucting port, be sleeved on the imbibition bar and have little by hand drive muzzle, be set in the handle that drives double as shell on the muzzle and can be in inner chamber reciprocating plunger, it is characterized in that, the inner chamber of described pipettor is divided into former and later two positions in storehouse, and is isolated by the O RunddichtringO between two storehouses; Described imbibition bar is connected with Qian Cang, plunger is arranged between forward and backward two storehouses and is fixedly mounted on the accent amount screw rod that is arranged in inner chamber, accent amount screw rod screws in the adjustment nut and embeds on the handle of double as shell, axially reciprocating in the chute that the adjustment nut can be established in handle; The front end of described accent amount screw rod is installed medi-spring and is hit by a bullet spring abutment and location cover for seat, its rear end is installed spring and upper spring seat and is screwed in and adjusts in the swivel nut, go back suit one counter on the accent amount screw rod, the handle of double as shell is positive to be provided with a window as reading with the counter corresponding section, and accent amount screw rod can turn round around its axis again along its axial-movement in the inner chamber of pipettor.

2, micropipettor as claimed in claim 1 is characterized in that, described driving on the muzzle inwall, and the position that is positioned at preceding storehouse is provided with a lower spring, is provided with a little spring near little by the hand place.

3, micropipettor as claimed in claim 1 is characterized in that, described counter is the digital gear counter.