CN115487882A

CN115487882A - Laboratory pipettor

Info

Publication number: CN115487882A
Application number: CN202211303482.9A
Authority: CN
Inventors: 李想; 杨蕊; 吴祥林
Original assignee: Xuzhou College of Industrial Technology
Current assignee: Xuzhou College of Industrial Technology
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2022-12-20
Also published as: CN113546705A; CN113546705B

Abstract

The invention discloses a laboratory pipettor, which comprises a shell, wherein the lower end of the shell is connected with a suction nozzle, the interior of the shell is connected with a first piston rod in a sliding manner, the lower end of the first piston rod is made of rubber and is connected with the inner wall of the shell in a sealing and sliding manner, an air chamber is formed in the first piston rod, the interior of the air chamber is connected with a second piston rod in a sliding manner, the upper end of the second piston rod is connected with a pressing handle, and the outer wall of the second piston rod is sleeved with a first spring.

Description

Laboratory pipettor

Technical Field

The invention relates to the technical field of liquid transfer equipment, in particular to a laboratory liquid transfer device.

Background

The pipettor is an instrument commonly used for moving and taking liquid in a laboratory, and for liquid with high viscosity, the pipettor may leave residual liquid on the inner wall of the suction nozzle after the liquid is beaten out, so that the waste is caused, the accuracy of the beaten out liquid is influenced, especially for viscous liquid, the accuracy of the liquid is greatly reduced, the viscosity is different at different room temperatures, and the wall hanging phenomenon is possibly caused to be uneven, so that the quantification is inaccurate.

Therefore, if the liquid can be blown out completely, accuracy of the pipette can be improved to some extent, and thus a laboratory pipette has been proposed.

Disclosure of Invention

The invention aims to provide a laboratory pipettor to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a laboratory pipettor, includes the casing, the lower extreme detachable of casing is connected with the suction nozzle that is used for the suction liquid, the inside sliding connection of casing has first piston rod, open the inside of first piston rod has the air chamber, the inside sliding connection of air chamber has the second piston rod to be used for realizing the inside gaseous one-way inside injection to the suction nozzle of air chamber, the upper end of second piston rod extends to the outside and the fixedly connected with of casing and presses the press handle, cup jointed on the second piston rod outer wall and be used for upwards kick-backing the first spring that resets with second piston rod and first piston rod.

Preferably, the inside fixedly connected with support of lower extreme of air chamber, there is the big toper form of the little lower part in upper portion to block up through second spring sliding connection on the support, open the inside of second piston rod has the passageway, the upper end and the outside atmosphere intercommunication of passageway, the lower extreme and the air chamber intercommunication of passageway, the lower extreme of passageway has the ball sealer through third spring sliding connection.

Preferably, the upper end of the channel is movably inserted with a hose, and one end of the hose far away from the channel is inserted in a container containing cleaning liquid.

Preferably, the upper end of the first piston rod and the two sides of the second piston rod are both provided with clamping rods, one ends of the clamping rods are rotatably connected to one side of the first piston rod through torsion springs, the side walls of the second piston rod are provided with clamping grooves, the side edges of the clamping rods are movably clamped inside the clamping grooves to fix the first piston rod and the second piston rod to realize linkage, the side walls of the shell are slidably connected with ejector rods through fourth springs, and the inner ends of the ejector rods movably drive the two clamping rods to rotate outwards to realize that the clamping rods are separated from the clamping grooves.

Preferably, the inside sliding connection of casing has the stopper, just the stopper cup joints on the outer wall of first piston rod, the lateral wall of casing is run through and extends to the outside to the both sides of stopper, there is the fixture block both sides of stopper through fifth spring sliding connection, fixture block activity joint is on the tooth wall, the tooth wall sets up on the lateral wall of casing.

Preferably, the side wall of the first piston rod is fixedly connected with a conducting strip, the outer side wall of the shell is fixedly provided with a counter, the counter is provided with two contacts, and the two contacts are movably communicated with the conducting strip to count the pipetting times.

Preferably, the suction nozzle is sleeved with a hollow nut, the hollow nut is meshed and connected with the lower end of the shell to fix the suction nozzle, and a gasket for sealing is arranged at the joint of the suction nozzle and the shell.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the liquid sucking device, the suction nozzle generates suction force for sucking liquid after the first piston rod slides upwards, so that the operation of sucking the liquid by the suction nozzle is realized, and the upwards sliding height of the first piston rod is limited by the position of the limiting block, so that the sucking amount of the liquid sucked at one time is adjusted;

2. according to the invention, the first piston rod is fixed in the shell after the ejector rod is pressed, and the clamping rod is expanded by the inner end of the ejector rod and then is separated from clamping connection with the clamping groove, so that the second piston rod can be pressed independently, when the second piston rod moves downwards in the air chamber, air in the air chamber is pushed open and blocked, and then flows to the inside of the suction nozzle along the blocked inclined plane, so that the air can rapidly flow along the inner wall of the suction nozzle, and the liquid adhered to the inner wall of the suction nozzle is thoroughly blown out, and the accuracy of the liquid is improved;

3. the invention can suck the cleaning liquid in the container to the inside of the air chamber through the hose, and the cleaning liquid entering the air chamber is sprayed to the inside of the suction nozzle from the lower end of the air chamber, so that the inner wall of the suction nozzle can be thoroughly cleaned under the state that the suction nozzle is not detached, and the experiment is facilitated.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic diagram II of the overall structure of the present invention;

FIG. 3 is a schematic diagram III of the overall structure of the present invention;

FIG. 4 is a cross-sectional view of the overall construction of the present invention;

FIG. 5 is an exploded view of the housing, suction nozzle, hollow nut and gasket of the present invention;

FIG. 6 is a cross-sectional view of the housing, the first piston rod, the limiting block and the fixture block of the present invention;

FIG. 7 is an enlarged view taken at A of FIG. 6 in accordance with the present invention;

FIG. 8 is a cross-sectional view I of the housing, the first piston rod, the second piston rod, the clamping rod and the ejector rod of the present invention;

FIG. 9 is a cross-sectional view II of the housing, the first piston rod, the second piston rod, the clamping rod and the top rod of the present invention;

FIG. 10 is a cross-sectional view of the housing, first piston rod, air chamber and second piston rod of the present invention;

FIG. 11 is a cross-sectional view of the first piston rod, air chamber, plug and mouthpiece of the present invention;

FIG. 12 is an exploded view of the first piston rod, conductive plate, contacts and counter of the present invention;

fig. 13 is a cross-sectional view of the first piston rod, the second piston rod, the air chamber, the clamping rod and the clamping groove of the present invention.

In the figure: 1. the device comprises a shell, 2, a suction nozzle, 3, a first piston rod, 301, an air chamber, 4, a second piston rod, 401, a channel, 5, a pressing handle, 6, a first spring, 7, a support, 8, a second spring, 9, a plug, 10, a third spring, 11, a sealing ball, 12, a hose, 13, a clamping rod, 14, a torsion spring, 15, a clamping groove, 16, a fourth spring, 17, a push rod, 18, a limiting block, 19, a fifth spring, 20, a clamping block, 21, a tooth wall, 22, a conducting strip, 23, a counter, 24, a contact, 25, a hollow nut, 26 and a gasket.

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. 1-13, the present invention provides a technical solution: the utility model provides a laboratory pipettor, includes casing 1, the detachable suction nozzle 2 that is used for sucking liquid that is connected with of lower extreme of casing 1, the inside sliding connection of casing 1 has first piston rod 3, as shown in fig. 10, the lower extreme of first piston rod 3 adopts the rubber material, the lower extreme of first piston rod 3 and the sealed sliding connection of the inner wall of shell 1, like this when first piston rod 3 slides from top to bottom, suction nozzle 2 realizes absorbing or discharging liquid, air chamber 301 has been opened to the inside of first piston rod 3, the inside sliding connection of air chamber 301 has second piston rod 4 to be used for realizing the gaseous one-way injection to the inside of suction nozzle 2 of air chamber 301, as shown in fig. 10, the lower extreme of second piston rod 4 adopts the rubber material, the lower extreme of second piston rod 4 and the inner wall sealed sliding connection of air chamber 301, like this when second piston rod 4 slides from top to bottom, can push down the gaseous pressing handle 5 to the inside of air chamber 301, the upper end of second piston rod 4 extends to the outside of casing 1 and fixedly connected with the pressing handle 5, second piston rod 4 cup joints on the outer wall and is used for pressing second piston rod 4 and first piston rod 3 slides from top to bottom, and the first piston rod 3 returns to the elasticity that the liquid returns back to the first piston rod 6, and the first piston rod is realized through the first piston rod 3, like this moment, like this first piston rod 3 slides from the elastic force that the first piston rod 4 slides from top to the first piston rod 3, the elastic force that the piston rod 4 slides from top to the back and first piston rod is not.

When liquid in the suction nozzle 2 is discharged, in order to completely discharge the liquid in the suction nozzle 2, a support 7 is fixedly connected to the inside of the lower end of the air chamber 301, a conical plug 9 with a small upper part and a large lower part is connected to the support 7 in a sliding manner through a second spring 8, air flowing downwards from the air chamber 301 flows into the suction nozzle 2 along the inclined surface of the plug 9 through the diversion of the plug 9, so that the air can rapidly flow along the inner wall of the suction nozzle 2, and the liquid adhered to the inner wall of the suction nozzle 2 is blown out, a channel 401 is formed in the second piston rod 4, the upper end of the channel 401 is communicated with the outside atmosphere, the lower end of the channel 401 is communicated with the air chamber 301, the lower end of the channel 401 is connected with a sealing ball 11 through a third spring 10 in a sliding manner to enable the outside air to flow in one way to the inside of the air chamber 301, the second spring 8 can have a large elastic coefficient, so that large air pressure can be borne, and the air can be blown out and the inner wall of the suction nozzle 2 can be cleaned to obtain a good effect;

the device structure of the application can be specially equipped for a certain variety of reagents and is used as a special device, so that the suction nozzle 2 can be reused, further, in order to clean the inner wall of the suction nozzle 2, the upper end of the channel 401 is movably inserted with the hose 12, one end of the hose 12, which is far away from the channel 401, is inserted in a container containing cleaning liquid, after the second piston rod 4 is independently pressed, the cleaning liquid in the container can be sucked into the air chamber 301 through the hose 12, and the cleaning liquid entering the air chamber 301 is sprayed into the suction nozzle 2 from the lower end of the air chamber 301, so that the suction nozzle 2 can be cleaned;

the insertion hose 12 is carried out after pipetting is finished, the hose 12 is inserted into the end part of the channel 401, the flowing process of the cleaning liquid is the same as the flowing process of the air flow inside the air chamber 301, after cleaning is finished (the hose 12 is removed, and the cleaning liquid in the air chamber 301 is emptied), the handle 5 is pressed for several times, so that the air inside the air chamber 301 flows to the inside of the suction nozzle 2, the cleaning liquid accumulated in the suction nozzle 2 is cleaned, and the cleaning inside the suction nozzle 2 is ensured.

As shown in fig. 8-9, 13, in order to be able to fix the first piston rod 3 inside the housing 1, and the second piston rod 4 can controllably and independently slide in the first piston rod 3, the clamping rods 13 are arranged at the upper end of the first piston rod 3 and at the two sides of the second piston rod 4, one end of the clamping rod 13 is rotationally connected to one side of the first piston rod 3 through a torsion spring 14, the clamping rod 13 is rotationally connected to a rotating shaft, the rotating shaft is fixed on the first piston rod 3, one end of the torsion spring 14 is fixedly connected to the rotating shaft, the other end of the torsion spring 14 is fixedly connected to the clamping rod 13, thus, when the driving chuck rod 13 rotates outwards, the torsion spring 14 will generate an inwards rotating torsion force to the chuck rod 13, the side wall of the second piston rod 4 is provided with a clamping groove 15, the clamping rod 13 is clamped inside the clamping groove 15 after being subjected to the torsion force of the torsion spring 14, the side edge of the clamping rod 13 is movably clamped inside the clamping groove 15 to fix the first piston rod 3 and the second piston rod 4 to realize linkage, the side wall of the shell 1 is connected with a top rod 17 in a sliding way through a fourth spring 16, the fourth spring 16 has outward elasticity to the top rod 17, the inner end of the top rod 17 movably drives the two clamping connection rods 13 to rotate outwards to realize that the clamping connection rods 13 are separated from the clamping grooves 15, when it is desired to couple the first piston rod 3 with the second piston rod 4 (i.e. to suck or discharge liquid) as shown in figure 8, the ejector rod 17 is loosened, so that the ejector rod 17 slides outwards under the elastic force of the fourth spring 16, the inner end of the ejector rod 17 is not contacted with the clamping rod 13, at the moment, the clamping rod 13 is clamped in the clamping groove 15, therefore, the first piston rod 3 is linked with the second piston rod 4, so that the liquid transfer device can normally suck or discharge liquid;

when the first piston rod 3 needs to be fixed inside the housing 1, and the second piston rod 4 can slide inside the first piston rod 3, the push rod 17 is pressed, at this time, the push rod 17 overcomes the elastic force of the fourth spring 16 to slide inwards, so that the inner end of the push rod 17 outwards supports the clamping rod 13, at this time, the clamping rod 13 is separated from the clamping groove 15, when the pressing handle 5 is pressed again, the second piston rod 4 can slide inside the first piston rod 3, at this time, the push rod 17 supports the two clamping rods 13, and the push rod 17 can also block the upper end of the first piston rod 3, so that the first piston rod 3 is fixed after sliding to the bottommost position, and thus, the second piston rod 4 can be stably operated, and the liquid adhered to the inner wall of the suction nozzle 2 can be blown out or the inner wall of the suction nozzle 2 can be cleaned.

The liquid discharge process for the inside of the suction nozzle 2 at each time is as follows:

the pressing handle 5 is pressed, at the moment, the second piston rod 4 and the first piston rod 3 synchronously slide downwards, so that the first piston rod 3 firstly discharges all liquid in the suction nozzle 2 after sliding downwards, at the moment, the first piston rod 3 slides to the bottommost part, in this state, the ejector rod 17 is pressed, the ejector rod 17 overcomes the elastic force of the fourth spring 16 and slides towards the inside of the shell 1, so that the ejector rod 17 can block the upper side of the first piston rod 3 and simultaneously prop the two clamping and connecting rods 13 open, so that when the pressing handle 5 is pressed again, the second piston rod 4 is driven to independently slide downwards, so that the first piston rod 4 can downwards press the gas in the gas chamber 301, at the moment, the gas in the gas chamber 301 can prop open the plug 9 and then rapidly flow into the inside of the suction nozzle 2, so that the liquid adhered to the inner wall of the suction nozzle 2 can be blown out through the gas flowing into the inside of the suction nozzle 2, the second piston rod 4 can be continuously pressed for multiple times, and the air blowing and emptying operation can be carried out.

As shown in fig. 6-7, in order to control the suction amount of the liquid sucked by the suction nozzle 2, specifically, a limiting block 18 is slidably connected inside the housing 1, the limiting block 18 is sleeved on the outer wall of the first piston rod 3, two sides of the limiting block 18 penetrate through the side wall of the housing 1 and extend to the outside, two sides of the limiting block 18 are slidably connected with a fixture block 20 through a fifth spring 19, the fixture block 20 receives the outward elastic force of the fifth spring 19, the fixture block 20 is movably clamped on a tooth wall 21, the tooth wall 21 is arranged on the side wall of the housing 1, when the suction amount of the liquid is adjusted, the two fixture blocks 20 are pressed, the two fixture blocks 20 overcome the elastic force of the fifth spring 19 and contract towards the inside of the limiting block 18, so that the fixture block 20 is separated from the clamping with the tooth wall 21, in the pressed state, the limiting block 20 can drive the limiting block 18 to slide inside the housing 1 through the fixture block 20, the limiting block 20 is loosened after the position of the limiting block 18 is adjusted, at this time, the fixture block 20 is clamped on the tooth wall 21 again through the elastic force of the fifth spring 19, so that the limiting block 18 is adjusted position, the piston rod 18 can be adjusted, so that the piston rod 6 can be used for stably operated to limit the suction stroke of the piston rod 2, and the piston rod 3, and the piston rod can be stably operated, so that the piston rod 4 can be adjusted lower end of the piston rod 3, and the piston rod 3 can be more stably operated, and the piston rod 4 can be adjusted.

As shown in fig. 12, in order to count the number of times of sucking liquid, specifically, a conducting strip 22 is fixedly connected to a side wall of the first piston rod 3, a counter 23 is fixedly installed on an outer side wall of the housing 1, two contacts 24 are provided on the counter 23, the two contacts 24 are movably communicated with the conducting strip 22 to count the number of times of pipetting, after the pressing handle 5 is pressed, the pressing handle 5 drives the first piston rod 3 and the second piston rod 4 to slide downwards, when the first piston rod 3 slides downwards to the bottommost part, the two contacts 24 and the conducting strip 22 are simultaneously contacted to generate current, and at this time, the counter 23 counts once after receiving a current signal, so that the number of times of sucking liquid is counted, and the counter can be used as an index for regular cleaning.

In order to make suction nozzle 2 high-speed joint on casing 1, specifically speaking, hollow nut 25 has cup jointed on suction nozzle 2, hollow nut 25 meshing is connected and is realized the fixed to suction nozzle 2 at casing 1's lower extreme, as 5 shows, suction nozzle 2 is close to casing 1's one end and is equipped with the chimb, cup joints back to suction nozzle 2 from the lower extreme when hollow nut 25, and hollow nut 25 can carry out the joint to suction nozzle 2's chimb to the realization is to the installation of suction nozzle 2, suction nozzle 2 is equipped with the gasket 26 that is used for sealing with casing 1's junction, and the material of gasket 26 adopts the rubber material, realizes sealing up suction nozzle 2 and casing 1's junction.

In order to further completely discharge the liquid in the suction nozzle 2, specifically, the suction nozzle 2 can be reused, the inner wall of the suction nozzle 2 is provided with an anti-sticking coating, for example, the anti-sticking coating adopts a silicon dioxide nano coating and a polytetrafluoroethylene coating, so that the adhesion of the liquid on the inner wall of the suction nozzle 2 is reduced, in addition, the suction nozzle can also adopt a transparent material, and the outer wall of the suction nozzle is provided with scales, so that the suction amount of the liquid sucked in the suction nozzle 2 can be accurately known by observing the scales; in addition, a disposable pipetting head can be sleeved at the end part of the suction nozzle 2 and is discarded after use.

The working principle is as follows:

the fixture block 20 is pressed and the limit block 18 is driven to slide on the housing 1, so that the sucking amount of the liquid to be sucked is adjusted, then the housing 1 is held in the posture shown in fig. 1, the thumb is pressed on the pressing handle 5, the pressing handle 5 is pressed to enable the first piston rod 3 and the second piston rod 4 to slide downwards to the topmost part, in this state, the lower end of the suction nozzle 2 is inserted into the liquid, then the pressing handle 5 is released, at the moment, the first piston rod 3 and the second piston rod 4 are bounced upwards and reset through the elastic force of the first spring 6, so that the liquid sucking operation is realized, when the liquid in the suction nozzle 2 is discharged, the thumb is used for pressing the pressing handle 5, the liquid in the suction nozzle 2 is discharged, in this state, the push rod 17 (which can be pressed by a little finger) is pressed, the first piston rod 3 is fixed in the housing 1, the second piston rod 4 can slide in the first piston rod 3, the first piston rod 3 can press the gas in the gas chamber 301, the gas can push the gas out of the gas chamber 301 to push the gas to blow the gas out, and the gas flowing into the inner wall of the suction nozzle 2 can be adhered to the inner wall of the suction nozzle 2.

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. The utility model provides a laboratory pipettor, includes casing (1), the lower extreme of casing (1) is connected with suction nozzle (2), the inside sliding connection of casing (1) has first piston rod (3), the lower extreme of first piston rod (3) adopt the rubber material and with the sealed sliding connection of inner wall of shell (1), open the inside of first piston rod (3) has air chamber (301), its characterized in that: the air suction nozzle is characterized in that a second piston rod (4) is connected to the inside of the air chamber (301) in a sliding manner, the upper end of the second piston rod (4) extends to the outside of the shell (1) and is fixedly connected with a pressing handle (5), a first spring (6) is sleeved on the outer wall of the second piston rod (4), a support (7) is fixedly connected to the inside of the lower end of the air chamber (301), a conical plug (9) with a small upper part and a large lower part is connected to the support (7) in a sliding manner through a second spring (8) so that air flowing out of the air chamber (301) downwards flows to the inside of the suction nozzle (2) along the inclined plane of the plug (9), the air rapidly flows along the inner wall of the suction nozzle (2), a channel (401) is formed in the inside of the second piston rod (4), the upper end of the channel (401) is communicated with the outside atmosphere, the lower end of the channel (401) is communicated with the air chamber (301), and a sealing ball (11) is connected to the lower end of the channel (401) in a sliding manner through a third spring (10);

clamping rods (13) are arranged at the upper end of the first piston rod (3) and on two sides of the second piston rod (4), clamping grooves (15) are formed in the side wall of the second piston rod (4), the side edges of the clamping rods (13) are movably clamped in the clamping grooves (15), an ejector rod (17) is connected to the side wall of the shell (1) in a sliding mode through a fourth spring (16), and when the clamping rods (13) are outwards spread by pressing the inner end of the ejector rod (17) after the ejector rod (17) is pressed, the clamping rods (13) are separated from the clamping grooves (15);

the liquid discharge in the suction nozzle (2) comprises the following processes:

the pressing handle (5) is pressed, the second piston rod (4) and the first piston rod (3) synchronously slide downwards, and the first piston rod (3) slides downwards to the bottommost part to discharge the liquid in the suction nozzle (2);

the push rod (17) is pressed, and the push rod (17) is used for blocking the upper side of the first piston rod (3) and simultaneously opening the two clamping rods (13);

pressing the pressing handle (5) again, driving the second piston rod (4) to independently slide downwards, pressing the gas in the gas chamber (301) downwards by the first piston rod (4), and then rapidly flowing the gas in the gas chamber (301) into the suction nozzle (2) after pushing the plug (9) open, so as to blow out the liquid adhered to the inner wall of the suction nozzle (2);

continuously pressing the second piston rod (4) for a plurality of times to perform a plurality of air blowing and cleaning operations;

fixedly connected with conducting strip (22) on the lateral wall of first piston rod (3), fixed mounting has counter (23) on the lateral wall of casing (1), be equipped with two contacts (24) on counter (23), after first piston rod (3) gliding to the bottommost, two contacts (24) and conducting strip (22) contact simultaneously are counted the number of times of absorbing liquid.

2. A laboratory pipette according to claim 1, characterized in that: the upper end of the channel (401) is movably inserted with a hose (12), and one end of the hose (12) far away from the channel (401) is inserted in a container filled with cleaning liquid.

3. A laboratory pipette according to claim 1, characterized in that: one end of the clamping rod (13) is rotatably connected to one side of the first piston rod (3) through a torsion spring (14).

4. A laboratory pipette according to claim 1, characterized in that: the inside sliding connection of casing (1) has stopper (18), the both sides of stopper (18) have fixture block (20) through fifth spring (19) sliding connection, fixture block (20) activity joint is on tooth wall (21).

5. A laboratory pipette as defined in claim 1 wherein: the suction nozzle is characterized in that a hollow nut (25) is sleeved on the suction nozzle (2), the lower end of the shell (1) is meshed with the hollow nut (25) to fix the suction nozzle (2), a gasket (26) used for sealing is arranged at the joint of the suction nozzle (2) and the shell (1), a convex edge is arranged at one end, close to the shell (1), of the suction nozzle (2), and after the hollow nut (25) is sleeved on the suction nozzle (2) from the lower end, the hollow nut (25) is connected with the convex edge of the suction nozzle (2) in a clamping mode.