CN112517097A

CN112517097A - Micro liquid transfer device

Info

Publication number: CN112517097A
Application number: CN202011383327.3A
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-01
Filing date: 2020-12-01
Publication date: 2021-03-19

Abstract

The invention relates to the technical field of experimental instruments and discloses a micropipettor which comprises a gun body, wherein a slotted hole is formed in the middle of the gun body, a sleeve is integrally formed below the gun body, a gun head is movably sleeved on the lower portion of the sleeve, a piston is movably sleeved in the middle of the gun body and matched with the slotted hole, a blocking column is movably sleeved in the middle of the top of the gun body and matched with the piston, and a pressure spring is movably sleeved on the outer surface of the piston and matched with the slotted hole. This micropipettor, move liquid measure through rotary piston control, it is the suction volume that directly converts the distance of pushing down of compression cover into the rifle head, the compression of pressure spring holds the ability promptly and is exactly the suction volume of rifle head, the cooperation that utilizes extension cover and compression cover makes the elasticity of pressure spring directly to on the extension cover, it shifts up to drive the piston to move up to absorb to utilize the upward movement of extension cover, among the change prior art, after the adjustment moves liquid measure numerical value, still need push down to carry out the process that the energy storage comes the imbibition, staff's operating procedure has been simplified.

Description

Micro liquid transfer device

Technical Field

The invention relates to the technical field of test instruments, in particular to a micropipettor.

Background

The micropipettor is a common experimental instrument for many disciplines, especially for physical qualitative and quantitative detection, and the detection test precision requirement is high, and it is required to ensure that the micro sample injector can absorb precisely.

The prior micropipette firstly needs to rotate an adjusting knob of the micropipette, the knob is rotated anticlockwise to improve the set liquid taking amount, the knob is rotated clockwise to reduce the liquid taking amount, a suction head is selected to be placed on a sleeve of the micropipette, slight pressure is applied to ensure that no air gap exists between the suction head and the sleeve, a button is pressed down, a sample injector is vertically held, the suction head is immersed in a position 3-5 mm below the liquid level, then the button is slowly and stably loosened to suck liquid, a suction head port is attached to the bottom of the inner wall of a container and keeps inclined, the button is stably pressed down to a first stop point, the button is pressed down to a second stop point after the stop, and the liquid in the suction head is.

The existing micropipettor is used, the micropipettor absorbs a liquid to press down a piston again after adjusting the absorption amount, the operation steps are repeated, meanwhile, the gun head is matched with the sleeve, after the micropipettor is used for a long time, sealing leakage is easy to occur, the amount of the absorbed solution is different from the set amount, the solution can be remained in the gun head due to the pressing-down extrusion mode, the extrusion is incomplete, and the amount of the solution in a container is different from the set amount.

Disclosure of Invention

The invention provides a micropipettor, which has the advantages of simple operation steps, good gun head installation tightness and no liquid retention when the gun head releases liquid, and solves the problems that the energy storage step needs to be pressed down after the numerical value of the suction amount is adjusted, the gun head is matched with a gap with inaccurate suction amount after being used for a long time, and simultaneously, the solution can be completely discharged by pressing down for two sections in the liquid discharging process.

The invention provides the following technical scheme: the utility model provides a micropipettor, includes the rifle body, the slotted hole has been seted up at the middle part of the rifle body, the below integrated into one piece of the rifle body has the sleeve pipe, sheathed tube lower part movable sleeve is equipped with the rifle head, the middle part of the rifle body and with slotted hole cooperation movable sleeve be equipped with the piston, the middle part at rifle body top and with piston movable sleeve be equipped with the bumping post, the surface of piston and with slotted hole cooperation movable sleeve be equipped with the pressure spring, the extension of the lower surface integrated into one piece extension of bumping post has the extension cover, extension cover and pressure spring activity sleeve, the middle part fixed sleeve of piston is equipped with the compression cover, the surface of compression cover has seted up the spiral shell tooth with the internal surface of extension cover, the sheathed tube inside is seted up the gas pocket, the gas pocket communicates the lower part of slotted hole, sheathed tube bottom fixed mounting has the.

Preferably, a gap is reserved between the lance head and the sleeve, and the distance from the inner wall of the air bag to the side wall of the lance head is shorter than the distance from the inner wall of the air bag to the upper surface of the lance head.

Preferably, the piston rotates to press down the pressure spring to control the suction amount of the gun head, and the compression amount of the pressure spring is the suction amount of the gun head.

Preferably, the slotted hole is formed in a step shape, the piston penetrates through the gun body along the minimum diameter of the slotted hole, the pressure spring is matched with the middle diameter of the slotted hole, and the extension sleeve is matched with the maximum diameter of the slotted hole.

The invention has the following beneficial effects:

1. this micropipettor, move liquid measure through rotary piston control, it is the suction volume that directly converts the distance of pushing down of compression cover into the rifle head, the compression of pressure spring holds the ability promptly and is exactly the suction volume of rifle head, the cooperation that utilizes extension cover and compression cover makes the elasticity of pressure spring directly to on the extension cover, it shifts up to drive the piston to move up to absorb to utilize the upward movement of extension cover, among the change prior art, after the adjustment moves liquid measure numerical value, still need push down to carry out the process that the energy storage comes the imbibition, staff's operating procedure has been simplified.

2. This micropipettor, leave the gap through rifle head and sleeve pipe suit, and the gas pocket communicates the gasbag and cooperates with the rifle head, make rifle head and sleeve pipe cooperation back, the rotatory in-process that moves down of the inherent compression cover of gasbag is aerifyd, the effect fixed of centre gripping has at first to the rifle head, sealed effect has again, make rifle head imbibition back can not the weeping, simultaneously when the flowing back, the shrink of gasbag makes, the release of rifle head internal gas pressure, the solution in the rifle head can directly discharge, can not persist the solution, guarantee to move the volume after the liquid and absorb the volume and equal, need not push down in the current equipment and need the problem of segmentation.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is a schematic structural view of the present invention after adjusting the suction amount;

FIG. 3 is a schematic view of the present invention in a liquid-absorbing configuration;

FIG. 4 is a schematic top view of the present invention;

FIG. 5 is a schematic perspective cross-sectional view of an elongated sleeve according to the present invention;

fig. 6 is a schematic perspective view of the piston of the present invention.

In the figure: 1. a gun body; 2. a sleeve; 3. a gun head; 4. a pressure spring; 5. a piston; 6. a bumping post; 7. extending the sleeve; 8. compressing the sleeve; 9. screw teeth; 10. air holes; 11. an air bag; 12. locking; 13. a slot hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, a micropipettor includes a gun body 1, a slotted hole 13 is formed in the middle of the gun body 1, a sleeve 2 is integrally formed below the gun body 1, a gun head 3 is movably sleeved on the lower portion of the sleeve 2, a piston 5 is movably sleeved on the middle of the gun body 1 and matched with the slotted hole 13, a blocking column 6 is movably sleeved on the middle of the top of the gun body 1 and matched with the piston 5, a compression spring 4 is movably sleeved on the outer surface of the piston 5 and matched with the slotted hole 13, an extension sleeve 7 is integrally formed on the lower surface of the blocking column 6, the extension sleeve 7 is movably sleeved with the compression spring 4, a compression sleeve 8 is fixedly sleeved on the middle of the piston 5, helical teeth 9 are formed on the outer surface of the compression sleeve 8 and the inner surface of the extension sleeve 7, an air hole 10 is formed inside the sleeve 2, the air hole 10 is communicated with the lower portion of the slotted hole 13, an.

Wherein, rifle head 3 and sleeve pipe 2 suit leave the space, the inner wall of gasbag 11 is shorter than the upper surface distance to rifle head 3 to the lateral wall of rifle head 3, communicate gasbag 11 and cooperate with rifle head 3 through gas pocket 10, make rifle head 3 and sleeve pipe 2 cooperation back, the rotatory in-process that moves down of compression cover 8 in the gasbag 11 is aerifyd, at first have the fixed effect of centre gripping to rifle head 3, sealed effect has again, make rifle head 3 not weeping after the imbibition, simultaneously when flowing back, gasbag 11's shrink makes, rifle head 3 internal gas pressure release, the solution in rifle head 3 can directly be discharged, can not persist the solution, the volume after guaranteeing to move the liquid equals with the suction volume.

Wherein, the piston 5 rotates to push down the suction volume of pressure spring 4 control rifle head 3, the compression volume of pressure spring 4 is the suction volume of rifle head 3, move the liquid measure through rotary piston 5 control, it is the suction volume of directly converting the distance of pushing down of compression cover 8 into rifle head 3, utilize the cooperation of extension cover 7 and compression cover 8 to make the elasticity of pressure spring 4 can directly act on extension cover 7, utilize the upward movement of extension cover 7 to drive piston 5 and move upward and absorb, change among the prior art, after adjusting and move the liquid measure numerical value, still need push down to carry out the process that the energy storage comes the imbibition, staff's operating procedure has been simplified.

The slotted hole 13 is formed in a stepped shape, the piston 5 penetrates through the gun body 1 along the minimum diameter of the slotted hole 13, the pressure spring 4 is matched with the middle diameter of the slotted hole 13, the extension sleeve 7 is matched with the maximum diameter of the slotted hole 13, the piston 5 and the extension sleeve 7 are matched with different apertures of the slotted hole 13, so that the piston 5 can act on the gun head 3 to suck and release liquid, the pressure spring 4 can store energy under the action that the piston 5 drives the compression sleeve 8 to press downwards, and the extension sleeve 7 can directly act on the extension sleeve 7 under the action that the compression sleeve 8 and the extension sleeve 7 are matched through the spiral teeth 9 to release the pressure of the pressure spring 4 to drive the piston 5 to move upwards to suck liquid.

The working principle of the micropipette is as follows:

firstly, a gun head 3 is matched with the bottom of a sleeve 2, then a piston 5 is rotated to control a compression sleeve 8 and an extension sleeve 7 to rotate and move downwards, a compression pressure spring 4 is compressed to store energy and reach a required absorption quantity value, the compression sleeve 8 moves downwards to inject gas in a slotted hole 13 into an air bag 11 through an air hole 10, the air bag 11 is expanded and then contacts with the side wall of the gun head 3 to clamp and fix the gun head 3, then contacts with the upper surface of the gun head 3 to seal a matching gap between the gun head 3 and the sleeve 2, a movable sleeve at the bottom of the sleeve 2 is fastened, the air hole 10 is blocked by the compression air bag 11, the gun head 3 is vertically placed into a solution to be extracted by holding a gun body 1, a lock catch 12 is opened, the elastic force of the compression spring 4 is directly installed through threads of the compression sleeve 8 and the extension sleeve 7 and is transmitted to a blocking column 6, the blocking column 6 is limited to move upwards slowly, the piston 5, the gun head 3 is contacted with the inner wall of a new container, the lock catch 12 is rotated, the control catch 6 drives the piston 5 to move upwards, meanwhile, air in the air bag 11 is discharged, the installation gap between the gun head 3 and the sleeve 2 is not sealed, and the solution in the gun head 3 can be directly discharged.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A micropipette, comprising a gun body (1), characterized in that: the improved gun is characterized in that a slotted hole (13) is formed in the middle of the gun body (1), a sleeve (2) is integrally formed below the gun body (1), a gun head (3) is movably sleeved on the lower portion of the sleeve (2), a piston (5) is movably sleeved on the middle of the gun body (1) in a matched mode with the slotted hole (13), a blocking column (6) is movably sleeved on the middle of the top of the gun body (1) in a matched mode with the piston (5), a pressure spring (4) is movably sleeved on the outer surface of the piston (5) in a matched mode with the slotted hole (13), an extension sleeve (7) is integrally formed and extended on the lower surface of the blocking column (6), the extension sleeve (7) is movably sleeved with the pressure spring (4), a compression sleeve (8) is fixedly sleeved on the middle of the piston (5), spiral teeth (9) are formed on the outer surface of the compression sleeve (8) and the inner surface of the extension sleeve (7), and an air, the air hole (10) is communicated with the lower part of the slotted hole (13), the bottom end of the sleeve (2) is fixedly provided with an air bag (11), and two movable locks (12) are arranged on the upper surface of the gun body (1).

2. A micropipette according to claim 1, wherein: a gap is reserved between the gun head (3) and the sleeve (2) in a sleeved mode, and the distance from the inner wall of the air bag (11) to the side wall of the gun head (3) is shorter than the distance from the inner wall of the air bag to the upper surface of the gun head (3).

3. A micropipette according to claim 1, wherein: the piston (5) rotates to press the pressure spring (4) downwards to control the suction amount of the gun head (3), and the compression amount of the pressure spring (4) is the suction amount of the gun head (3).

4. A micropipette according to claim 1, wherein: the slotted hole (13) is formed in a step shape, the piston (5) penetrates through the gun body (1) along the minimum diameter of the slotted hole (13), the pressure spring (4) is matched with the middle diameter of the slotted hole (13), and the extension sleeve (7) is matched with the maximum diameter of the slotted hole (13).