CN213699936U

CN213699936U - Quantitative pipette

Info

Publication number: CN213699936U
Application number: CN202022368496.1U
Authority: CN
Inventors: 刘运飞; 王有艳
Original assignee: Qingdao Baiming Technology Development Co ltd
Current assignee: Qingdao Baiming Technology Development Co ltd
Priority date: 2020-10-22
Filing date: 2020-10-22
Publication date: 2021-07-16
Anticipated expiration: 2030-10-22

Abstract

The utility model discloses a quantitative pipette, including first stock solution storehouse, second stock solution storehouse, third stock solution storehouse, fourth stock solution storehouse and gasbag, first stock solution storehouse includes first tubulose portion, first most and the second tubulose portion of expanding, the second stock solution storehouse includes that the second expands most and third tubulose portion, the third stock solution storehouse includes third most and the fourth tubulose portion of expanding, the fourth stock solution storehouse includes fourth most and the fifth tubulose portion of expanding, the second tubulose portion stretch into to second expansion portion inner chamber and with second expansion portion intercommunication, third tubulose portion stretch into to third expansion portion inner chamber and with third expansion portion intercommunication, fourth tubulose portion stretch into to fourth expansion portion inner chamber and with fourth expansion portion intercommunication, the gasbag is connected to fifth tubulose portion. The utility model provides a pair of quantitative pipette, convenient operation is swift, but different capacity liquid is drawed to accurate ration, need not to purchase the pipette of a plurality of different ranges, reduces the storage space of pipette, reduces the instrument acquisition cost.

Description

Quantitative pipette

Technical Field

The utility model belongs to engineering detects chemical experiment and other chemical industry experimental fields, specifically is a quantitative pipette.

Background

In the case of engineering test chemistry or other chemical experiments, pipettes are common instruments used to extract liquids. After a conventional pipette takes liquid, the pipe orifice needs to be immediately pressed by the forefinger, the liquid level position is adjusted, liquid in the pipe flows out from the lower opening by relaxing the forefinger, and when the bottom of the liquid meniscus is tangent to the marked line, the pipe orifice is immediately pressed by the forefinger. However, in practice, the amount of liquid flowing out is not well controlled, and the meniscus of the liquid is lower than the reticle. At the moment, liquid needs to be repeatedly taken, and the liquid level is regulated, so that the aim of accurately extracting the liquid is fulfilled. The pipette is complex to operate and difficult to control, and can not quickly and accurately extract liquid with a certain volume.

Chinese patent CN203244983U discloses a quantitative pipette, which comprises a pipette, wherein the upper end of the pipette is provided with a quantitative device; the quantifying device comprises a piston cylinder, a piston and a connecting rod, wherein the piston and the connecting rod are positioned in the piston cylinder, the piston cylinder is fixed and communicated with the pipette, the piston is fixed with the connecting rod, a return spring is arranged between the piston and the bottom of the piston cylinder, and the connecting rod is provided with a scale value and an adjusting nut. Although being provided with proportioning device in this ration pipette, getting behind the liquid, the accessible adjusting nut sets for the liquid value of moving, has realized to a certain extent and has moved the ration of getting the liquid, complex operation, and difficult control still exists the too much or too little error of sample.

Therefore, how to design a quantitative pipette which is easy to operate, fast and accurate and can extract a certain volume of liquid is the problem to be solved by the present invention.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem in the background art and providing a quantitative pipette. The utility model provides a pair of quantitative pipette, it is easy and simple to handle, can accurate ration extract different capacity liquid.

The above technical purpose of the present invention is achieved by the following technical solutions:

a quantitative pipette comprises a first liquid storage bin, a second liquid storage bin, a third liquid storage bin, a fourth liquid storage bin and an air bag, wherein the first liquid storage bin comprises a first tubular part, a first expansion part and a second tubular part, the bottom end of the first tubular part is a liquid sucking end, the first tubular part, the first expansion part and the second tubular part are sequentially communicated, the second liquid storage bin comprises a second expansion part and a third tubular part, the second expansion part and the third tubular part are sequentially communicated, the third liquid storage bin comprises a third expansion part and a fourth tubular part, the third expansion part and the fourth tubular part are sequentially communicated, the fourth liquid storage bin comprises a fourth expansion part and a fifth tubular part, the fourth expansion part and the fifth tubular part are sequentially communicated, the second tubular part extends into an inner cavity of the second expansion part and is communicated with the second expansion part, the third tubular part extends into an inner cavity of the third expansion part and is communicated with the third expansion part, the fourth tubulose portion stretches into to the expanded portion inner chamber of fourth and with the expanded portion intercommunication of fourth, the gasbag is connected to fifth tubulose portion, first stock solution storehouse, second stock solution storehouse, third stock solution storehouse and fourth stock solution storehouse communicate in proper order and form the cavity that holds liquid.

According to the quantitative pipette, the second bulge part, the third bulge part and the fourth bulge part are respectively provided with a second volume scale mark, a third volume scale mark and a fourth volume scale mark, the second volume scale mark is flush with the top end of the second tubular part, the third volume scale mark is flush with the top end of the third tubular part, and the fourth volume scale mark is flush with the top end of the fourth tubular part.

According to the quantitative pipette, the second volume scale mark, the third volume scale mark and the fourth volume scale mark divide the second liquid storage bin, the third liquid storage bin and the fourth liquid storage bin into the first cavity and the second cavity which are equal in upper and lower volumes respectively.

A dosing pipette as described above, the second volume scale having a value equal to the volume of the first reservoir; the numerical value of the third volume scale mark is equal to the sum of the capacities of half of the first liquid storage bin and the second liquid storage bin; the numerical value of the fourth volume scale mark is equal to the sum of the capacities of the first liquid storage bin, one half of the second liquid storage bin and one half of the third liquid storage bin.

According to the quantitative pipette, the volumes of the second liquid storage bin, the third liquid storage bin and the fourth liquid storage bin are equal.

According to the quantitative pipette, the volumes of the first liquid storage bin, the second liquid storage bin, the third liquid storage bin and the fourth liquid storage bin are all 2 mL.

The second volume graduation mark, the third volume graduation mark and the fourth volume graduation mark are respectively 2mL, 3mL and 4 mL.

According to the quantitative pipette, the lower end of the air bag is conical, and the air bag is connected with the fifth tubular part in a matching mode.

A dosing pipette as described above, said balloon being made of an elastic material.

Compared with the prior art, the utility model has the advantages of it is following and beneficial effect:

1. the utility model provides a pair of quantitative pipette, including four stock solution storehouses and the gasbag in first stock solution storehouse, second stock solution storehouse, third stock solution storehouse and fourth stock solution storehouse, second tubulose portion stretches into to second inflation portion inner chamber and with second inflation portion intercommunication, third tubulose portion stretches into to third inflation portion inner chamber and with third inflation portion intercommunication, fourth tubulose portion stretches into to fourth inflation portion inner chamber and with fourth inflation portion intercommunication, gasbag is connected to fifth tubulose portion, and this quantitative pipette can once only be operated for the operator need not judge the volume of getting through observing whether liquid meniscus is less than the marking, can accurate ration extract different capacity liquid; the pipette with different measuring ranges is not needed to be adopted, the purpose of extracting liquid with different volumes is achieved, the quantitative pipette is simple, convenient and fast to operate, the storage space of the pipette is reduced, and the acquisition cost of experimental equipment is reduced.

2. The utility model provides a pair of quantitative pipette, second inflation portion, third inflation portion and fourth inflation portion are equipped with second volume scale mark, third volume scale mark and fourth volume scale mark on respectively, have improved the control accuracy who moves the liquid, have guaranteed the reliability of experimental data.

3. The utility model provides a pair of quantitative pipette, second volume scale mark, third volume scale mark and fourth volume scale mark are divided into first appearance chamber and the second appearance chamber that the volume equals about with second stock solution storehouse, third stock solution storehouse and fourth stock solution storehouse respectively, and the ration is accurate, has improved the accuracy that moves the liquid, has reduced the degree of difficulty that moves the liquid, has improved the efficiency that moves the liquid.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art, and it is obvious that the following description is only one embodiment of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a quantitative pipette provided by the present invention;

fig. 2(a) - (d) are schematic structural views of a first liquid storage bin, a second liquid storage bin, a third liquid storage bin and a fourth liquid storage bin respectively;

FIGS. 3(a) - (c) are schematic structural views of the first cavity, the second cavity and the second volume scale mark;

FIGS. 4(a) - (e) are schematic diagrams of quantitative extraction of liquids of different volumes;

fig. 5 is a schematic view of the bending of the balloon.

1-a first liquid storage bin, 2-a second liquid storage bin, 3-a third liquid storage bin, 4-a fourth liquid storage bin, 5-an air bag,

11-a first tubular portion, 12-a first enlarged portion, 13-a second tubular portion, 21-a third tubular portion, 22-a second enlarged portion, 23-a second volume scale mark, 31-a fourth tubular portion, 32-a third enlarged portion, 33-a third volume scale mark, 41-a fifth tubular portion, 42-a fourth enlarged portion, 43-a fourth volume scale mark, 201-a first cavity, 202-a second cavity.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiment of the present invention, all other embodiments obtained without creative work by the ordinary skilled person in the art all belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

Referring to fig. 1, a quantitative pipette comprises a first liquid storage bin 1, a second liquid storage bin 2, a third liquid storage bin 3, a fourth liquid storage bin 4 and an air bag 5, referring to fig. 2(a), wherein the first liquid storage bin 1 comprises a first tubular part 11, a first expansion part 12 and a second tubular part 13, the bottom end of the first tubular part 11 is a liquid sucking end, and the first tubular part 11, the first expansion part 12 and the second tubular part 13 are communicated in sequence; referring to fig. 2(b), the second reservoir 2 includes a second expansion portion 22 and a third tubular portion 21, and the second expansion portion 22 and the third tubular portion 21 are sequentially communicated; referring to fig. 2(c), the third reservoir 3 includes a third expansion portion 32 and a fourth tubular portion 31, and the third expansion portion 32 and the fourth tubular portion 31 are sequentially communicated; referring to fig. 2(d), the fourth reservoir 4 includes a fourth expansion portion 42 and a fifth tubular portion 41, the fourth expansion portion 42 and the fifth tubular portion 41 are sequentially communicated, the second tubular portion 13 extends into the inner cavity of the second expansion portion 22 and is communicated with the second expansion portion 22, the third tubular portion 21 extends into the inner cavity of the third expansion portion 32 and is communicated with the third expansion portion 32, the fourth tubular portion 31 extends into the inner cavity of the fourth expansion portion 42 and is communicated with the fourth expansion portion 42, the fifth tubular portion 41 is connected to the airbag 5, and the first reservoir 1, the second reservoir 2, the third reservoir 3 and the fourth reservoir 4 are sequentially communicated to form a cavity for containing liquid.

The quantitative pipette that this embodiment provided can be used to engineering detection chemistry experiment or other chemical industry experiments, but this pipette once operation for the operator need not to judge the volume of getting through observing whether liquid meniscus is less than the marking, can accurate ration extract different capacity liquid, also need not to adopt the pipette of a plurality of different ranges, reach the purpose of extracting different capacity liquid, this quantitative pipette easy operation convenient and fast, the storage space of pipette has been reduced, experimental facilities's acquisition cost has been reduced.

Referring to fig. 2(b) - (d) again, preferably, the second enlarged part 22, the third enlarged part 32 and the fourth enlarged part 42 are respectively provided with a second volume scale mark 23, a third volume scale mark 33 and a fourth volume scale mark 43, the second volume scale mark 23 is flush with the top end of the second tubular part 13, the third volume scale mark 33 is flush with the top end of the third tubular part 21, and the fourth volume scale mark 43 is flush with the top end of the fourth tubular part 31.

Referring to fig. 3(a) - (c), taking the second reservoir 2 as an example, preferably, the second volume graduation line 23 divides the second reservoir 2 into a first cavity 201 and a second cavity 202 with equal upper and lower volumes. Similarly, the third volume scale line 33 and the fourth volume scale line 43 divide the third liquid storage bin 3 and the fourth liquid storage bin 4 into a first cavity 201 and a second cavity 202 which have the same upper and lower volumes, respectively.

Preferably, the numerical value of the second volume scale 23 is equal to the capacity of the first liquid storage bin 1; the numerical value of the third volume scale mark 33 is equal to the sum of half of the capacities of the first liquid storage bin 1 and the second liquid storage bin 2; the numerical value of the fourth volume scale line 43 is equal to the sum of the capacities of the first liquid storage bin 1, half of the second liquid storage bin 2 and half of the third liquid storage bin 3.

Preferably, the volumes of the second liquid storage bin 2, the third liquid storage bin 3 and the fourth liquid storage bin 4 are equal.

Preferably, the volumes of the first liquid storage bin 1, the second liquid storage bin 2, the third liquid storage bin 3 and the fourth liquid storage bin 4 are all 2 mL.

Preferably, the second volume graduation mark 23, the third volume graduation mark 33 and the fourth volume graduation mark 43 are 2mL, 3mL and 4mL respectively.

Referring to fig. 5, preferably, the lower end of the balloon 5 is tapered, and the balloon 5 is connected to the fifth tubular portion 41. More preferably, the balloon 5 is made of an elastic material.

Use first stock solution storehouse 1, second stock solution storehouse 2, third stock solution storehouse 3, fourth stock solution storehouse 4 to be 2mL as an example, the quantitative pipette use of this embodiment is as follows:

as shown in fig. 4(b), when the liquid is taken out, the air bag 5 is pressed and rebounded to provide suction force, thereby sucking the liquid from the first tubular portion 11 of the first reservoir 1 into the first enlarged portion 12 and the second tubular portion 13. When the first reservoir 1 is filled with liquid, the excess liquid flows into the second expansion part 22 of the second reservoir 2 through the second tubular part 13, at this time, the liquid level in the second expansion part 22 is lower than the second volume scale line 23, as shown in fig. 5, at this time, the air bag 5 is bent at the lower end of the conical shape, and the lower end of the conical shape of the air bag 5 is pressed by fingers, and the liquid is released from the first tubular part 11 again through the extrusion of the air bag 5, and the volume of the liquid to be removed is 2 mL.

As shown in FIG. 4(d), when the second reservoir 2 is filled with the liquid, the excess liquid flows into the third enlarged portion 32 of the third reservoir 3, and the liquid level in the third enlarged portion 32 is lower than the third volume scale line 33, and the liquid is discharged from the first tubular portion 11, whereby the volume of the liquid to be removed is 3 ml.

As shown in FIG. 4(e), according to the above-mentioned method, when the third reservoir 3 is filled with the liquid, the excessive liquid flows into the fourth enlarged portion 42 of the fourth reservoir 4, and the liquid level in the fourth enlarged portion 42 is lower than the fourth volume scale line 43, and the liquid is discharged from the first tubular portion 11, the volume of the liquid to be transferred is 4 ml.

As shown in fig. 4(a), when the liquid is taken out, when the liquid height exceeds the second volume scale line 23 in the second liquid storage bin 2, the air bag 5 is taken out, the liquid above the second volume scale line 23 flows out completely, that is, the liquid in the second cavity 202 in the second liquid storage bin 2 flows out completely, the liquid in the first liquid storage bin 1 also flows out completely, and the liquid in the second liquid storage bin 2 is retained in the first cavity 201 and just fills the first cavity 201. The liquid was released from the fifth tubular portion 41, and the volume of the liquid removed at this time was 1 ml.

As shown in fig. 4(c), when the liquid level exceeds the fourth volume scale mark 43 in the fourth liquid storage bin 4 during liquid taking, the air bag 5 is removed, the liquid above the fourth volume scale mark 43 flows out completely, the liquid above the third volume scale mark 33 in the third liquid storage bin 3 flows out completely, the liquid above the second volume scale mark 23 in the second liquid storage bin 2 flows out completely, that is, the liquid in the second accommodating cavity 202 in the second liquid storage bin 2, the third liquid storage bin 3 and the fourth liquid storage bin 4 flows out completely, and the liquid in the first liquid storage bin 1 also flows out completely; and the liquid in the fourth liquid storage bin 4, the liquid in the third liquid storage bin 3 and the liquid in the second liquid storage bin 2 are respectively reserved in the first containing cavity 201 in the corresponding liquid storage bin and just filled with the first containing cavity 201. The liquid was released from the fifth tubular portion 41, and the volume of the liquid removed at this time was 3 ml.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A quantitative pipette, characterized by comprising a first liquid storage bin (1), a second liquid storage bin (2), a third liquid storage bin (3), a fourth liquid storage bin (4) and an air bag (5), wherein the first liquid storage bin (1) comprises a first tubular part (11), a first swelling part (12) and a second tubular part (13), the bottom end of the first tubular part (11) is a liquid sucking end, the first tubular part (11), the first swelling part (12) and the second tubular part (13) are communicated in sequence, the second liquid storage bin (2) comprises a second swelling part (22) and a third tubular part (21), the second swelling part (22) and the third tubular part (21) are communicated in sequence, the third liquid storage bin (3) comprises a third swelling part (32) and a fourth tubular part (31), and the third swelling part (32) and the fourth tubular part (31) are communicated in sequence, the fourth liquid storage bin (4) comprises a fourth expansion part (42) and a fifth tubular part (41), the fourth expansion part (42) and the fifth tubular part (41) are sequentially communicated, the second tubular part (13) extends into an inner cavity of the second expansion part (22) and is communicated with the second expansion part (22), the third tubular part (21) extends into an inner cavity of the third expansion part (32) and is communicated with the third expansion part (32), the fourth tubular part (31) extends into an inner cavity of the fourth expansion part (42) and is communicated with the fourth expansion part (42), the fifth tubular part (41) is connected with the air bag (5), and the first liquid storage bin (1), the second liquid storage bin (2), the third liquid storage bin (3) and the fourth liquid storage bin (4) are sequentially communicated to form a cavity for containing liquid.

2. A dosing pipette according to claim 1, characterised in that the second (22), third (32) and fourth (42) enlargements are provided with a second (23), third (33) and fourth (43) volume graduation markings, respectively, the second volume graduation marking (23) being flush with the top end of the second tubular part (13), the third volume graduation marking (33) being flush with the top end of the third tubular part (21), the fourth volume graduation marking (43) being flush with the top end of the fourth tubular part (31).

3. A dosing pipette according to claim 2, characterised in that the second (23), third (33) and fourth (43) volume graduations divide the second (2), third (3) and fourth (4) reservoirs into a first (201) and a second (202) volume chamber, respectively, of equal volume.

4. A dosing pipette as claimed in claim 3, characterised in that the second volume graduation (23) has a value equal to the volume of the first reservoir (1); the numerical value of the third volume scale mark (33) is equal to the sum of the capacities of half of the first liquid storage bin (1) and the second liquid storage bin (2); the numerical value of the fourth volume scale mark (43) is equal to the sum of the capacities of half of the first liquid storage bin (1), half of the second liquid storage bin (2) and half of the third liquid storage bin (3).

5. A dosing pipette as claimed in claim 2, characterised in that the volumes of the second, third and fourth reservoirs (2, 3, 4) are equal.

6. A dosing pipette according to claim 5, characterised in that the volumes of the first reservoir (1), the second reservoir (2), the third reservoir (3) and the fourth reservoir (4) are all 2 mL.

7. A dosing pipette as claimed in claim 6, characterised in that the second (23), third (33) and fourth (43) volume graduations are 2mL, 3mL and 4mL respectively.

8. A dosing pipette as claimed in claim 2, characterised in that the lower end of the balloon (5) is conical, the balloon (5) being fittingly connected to the fifth tubular part (41).

9. A dosing pipette as claimed in claim 8, characterised in that the balloon (5) is made of an elastic material.