CN216955314U

CN216955314U - Volatile liquid quantitative sampling device

Info

Publication number: CN216955314U
Application number: CN202123434523.1U
Authority: CN
Inventors: 钟新林; 方洁
Original assignee: Zhongke Puyan Guangzhou Testing Co ltd
Current assignee: Zhongke Puyan Guangzhou Testing Co ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-07-12
Anticipated expiration: 2031-12-30

Abstract

The utility model discloses a quantitative sampling device for volatile liquid, which comprises a liquid-transfering suction head with two open ends and a hollow connecting suction head with the inner diameter smaller than that of the liquid-transfering suction head, wherein the connecting suction head can be connected with the liquid-transfering suction head and is used for containing the volatile liquid sucked by the liquid-transfering suction head. According to the sampling device, as the inner diameter of the liquid transfer suction head is smaller than that of the connecting suction head, the evaporation surface of the solution in the sampling device is reduced from large to small, the volatilization speed of the volatile liquid is greatly reduced, the volume change of the solution caused by volatilization is reduced, the volatilization process of the volatile liquid is further slowed, and the accuracy of the transfer of the volatile liquid is ensured.

Description

Volatile liquid quantitative sampling device

Technical Field

The utility model relates to the field of sampling devices, in particular to a volatile liquid quantitative sampling device.

Background

At present, the operations such as accurate sampling, liquid transferring, mixing and the like of a liquid sample are generally operated through a liquid transferring device, the liquid transferring device is generally matched with a disposable liquid transferring suction head for use, and the purposes of liquid sucking and liquid discharging of the liquid transferring suction head are achieved through the vacuum adsorption principle in the using process. However, conventional pipette tips generally have a conical inner cavity structure, the inner diameter of the pipette tip is larger as the pipette tip is closer to the pipette tip, and when volatile liquid (such as dichloromethane or ethanol) is removed, the liquid is volatilized in the cavity of the pipette tip, so that the larger part of the inner diameter of the cavity of the pipette tip is larger, the volatilization is more obvious, and thus the partial volume of gas in the cavity of the pipette tip expands to cause the liquid to be squeezed out of the pipette tip, thereby causing inaccurate pipetting volume.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model aims to provide a volatile liquid quantitative sampling device which can reduce the evaporation area of volatile liquid and slow down the volatilization process of the volatile liquid so as to ensure the accuracy of the volatile liquid removal.

The purpose of the utility model is realized by adopting the following technical scheme:

the utility model provides a volatile liquid ration sampling device, is the liquid-transfering suction head and the cavity of open structure and the internal diameter is less than the connection suction head of liquid-transfering suction head internal diameter including both ends, connect the suction head can with liquid-transfering suction head is connected and is used for holding the volatile liquid that liquid-transfering suction head sucked.

Further, one end of the connecting pipette tip can be inserted into the inner cavity of the liquid-transfering pipette tip and is tightly connected with the side wall of the liquid-transfering pipette tip.

Furthermore, the liquid-transfering sucker includes the open cooperation portion of one end, and the one end of connecting the sucker can insert the inner chamber of cooperation portion and with the inner chamber lateral wall zonulae occludens of cooperation portion in the open end of cooperation portion.

Furthermore, an inner conical surface is arranged on the inner wall of the matching part, and an outer conical surface capable of being matched with the inner conical surface is arranged on the outer wall of the connecting suction head, so that the connecting suction head and the matching part can be tightly connected through the matching between the inner conical surface and the outer conical surface.

Further, an inner cylindrical surface is arranged on the inner wall of the matching part, and an outer cylindrical surface capable of being matched with the inner cylindrical surface is arranged on the outer wall of the connecting suction head, so that the connecting suction head and the matching part can be tightly connected through the matching between the inner cylindrical surface and the outer cylindrical surface.

Furthermore, one end surface of the inner cavity of the connecting suction head inserted into the matching part is abutted against the bottom surface of the inner cavity of the matching part.

Furthermore, the liquid transfer suction head also comprises a liquid transfer head with two open ends, the inner cavity of the liquid transfer head is a conical cavity, and one end with a large caliber of the cavity is connected with the matching part and is communicated with the inner diameter of the connecting suction head.

Further, the connecting sucker is provided with a connecting part at the end opposite to the end connected with the liquid-transfering sucker, and the connecting part is used for being connected with a liquid transferrer.

Compared with the prior art, the utility model has the beneficial effects that:

when the sampling device is used, the inner diameter of the liquid transfer suction head is smaller than the inner diameter of the connecting suction head, so that the evaporation surface of the solution in the sampling device is reduced from large to small, the volatilization speed of the volatile liquid is greatly reduced, the volume change of the solution caused by volatilization is reduced, the volatilization process of the volatile liquid is slowed, and the accuracy of the volatile liquid in the process of transferring is ensured.

Drawings

FIG. 1 is a schematic structural diagram of a sampling device according to the present invention;

FIG. 2 is a schematic exploded view of a sampling device according to the present invention;

fig. 3 is a schematic exploded view of a sampling device according to the present invention.

In the figure: 10. pipetting tips; 101. a fitting portion; 1011. an inner cylindrical surface; 1012. an inner conical surface; 102. a pipetting head; 1021. a conical cavity; 20. connecting a suction head; 201. an outer cylindrical surface; 202. an outer conical surface; 203. a connecting portion.

Detailed Description

The present invention will be described with reference to the accompanying drawings and the detailed description, and it should be noted that, in the following description, various embodiments or technical features may be arbitrarily combined to form a new embodiment without conflict.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", "vertical", "top", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The implementation mode is as follows:

as shown in FIGS. 1-3, the present invention shows a device for quantitatively sampling a volatile liquid.

The first embodiment is as follows:

as shown in FIGS. 1-2, in this embodiment, the sampling device comprises a pipette tip 10 with two open ends and a connecting tip 20 which is hollow and has an inner diameter smaller than that of the pipette tip 10, wherein the connecting tip 20 can be connected to the pipette tip 10 for accommodating volatile liquid sucked by the pipette tip 10. Therefore, it can be understood that when the sampling device is used, the inner diameter of the liquid transfer suction head 10 is smaller than that of the connection suction head 20, so that the evaporation surface of the volatile solution in the sampling device is reduced from the large to the small, the volatilization speed of the volatile liquid is greatly reduced, the volume change of the solution caused by volatilization is reduced, the volatilization process of the volatile liquid is slowed down, and the accuracy in the process of removing the volatile liquid is ensured.

In this embodiment, one end of the connection tip 20 can be inserted into the inner cavity of the pipette tip 10 and tightly connected to the sidewall thereof to communicate the inner cavity of the connection tip 20 with the inner cavity of the pipette tip 10, so that the volatile liquid sucked from the pipette tip 10 can enter the inner cavity of the connection tip 20 for storage. Specifically, the pipette tip 10 comprises a matching part 101 with one open end, one end of the connecting tip 20 can be inserted into the inner cavity of the matching part 101 at the open end of the matching part 101 and is tightly connected with the side wall of the inner cavity of the matching part 101, so that one end of the connecting tip 20 is tightly connected with the inner cavity of the matching part 101 and the inner cavity of the connecting tip 20 is communicated with the inner cavity of the pipette tip 10; further, an inner cylindrical surface 1011 is disposed on the inner wall of the fitting portion 101, and an outer cylindrical surface 201 capable of being fitted with the inner cylindrical surface 1011 is disposed on the outer wall of the connecting suction head 20, so that the connecting suction head 20 and the fitting portion 101 can be tightly connected through the fit between the inner cylindrical surface 1011 and the outer cylindrical surface 201.

It can be seen that the connection structure of the pipette tip 10 and the connection tip 20 is realized by inserting one end of the connection tip 20 into the inner cavity of the fitting part 101, and by fitting the inner cylindrical surface 1011 on the fitting part 101 and the outer cylindrical surface 201 on the connection tip 20 tightly, and the inner cavity of the pipette tip 10 and the inner cavity of the connection tip 20 are communicated. The inner wall of the matching part 101 can be tightly attached to and sealed with the outer wall of the connecting suction head 20 through the matching between the inner cylindrical surface 1011 and the outer cylindrical surface 201, so that the liquid is prevented from overflowing from a gap at the connecting part of the matching part 101 and the connecting suction head 20 in the process of absorbing the liquid.

Of course, in other embodiments, one end face of the connection tip 20 and the end face of the liquid transfer tip 10 opposite to the self-absorption end can be sealed by adhesion, and the inner cavity of the connection tip 20 and the inner cavity of the liquid transfer tip 10 can be communicated with each other, so it is not limited herein, and it is within the scope of the present invention for a person skilled in the art to reasonably change the connection structure of the connection tip 20 and the liquid transfer tip 10 and communicate the inner cavity of the connection tip 20 and the inner cavity of the liquid transfer tip 10 based on the inner diameter of the connection tip 20 being smaller than the inner diameter of the liquid transfer tip 10.

In this embodiment, connect the bottom surface butt of a terminal surface that suction head 20 inserted the inner chamber of cooperation portion 101 and the inner chamber of cooperation portion 101, there is the cavity so can avoid connecting a terminal surface that suction head 20 inserted the inner chamber of cooperation portion 101 and the bottom surface of the inner chamber of cooperation portion 101 to make the interior volatile liquid of intracavity of liquid-transfering suction head 10 can directly get into the inner chamber of connecting suction head 20, so can make the volatile process of volatile liquid in sampling device reach slowest effect, accuracy effect when making to move and get volatile liquid reaches the optimum.

In this embodiment, the liquid-transfering pipette tip 10 further includes a liquid-transfering tip 102 with two open ends, the inner cavity of the liquid-transfering tip 102 is a conical cavity 1021, one end with a large caliber of the conical cavity 1021 is connected with the matching part 101 and is communicated with the inner diameter of the connection pipette tip 20, one end with a small caliber of the conical cavity 1021 is used for contacting with the liquid to be adsorbed, and the liquid can be conveniently and rapidly introduced into the conical cavity 1021 from one end with a small caliber of the conical cavity 1021 through the conical cavity 1021. Therefore, the volatile liquid to be adsorbed enters the conical cavity 1021 from the small end of the caliber of the conical cavity 1021, and then enters the inner cavity of the suction head 20 from the large end of the caliber of the conical cavity 1021, because the caliber of the end of the conical cavity 1021 close to the matching part 101 is large, and the larger part space of the inner diameter is, the more obvious the volatile liquid volatilization can be caused, but the inner diameter of the suction head 20 is smaller than the large caliber of the conical cavity 1021, namely the evaporation surface of the volatile solution is reduced greatly, the volatilization speed of the volatile liquid is greatly reduced, the volume change of the solution caused by volatilization is reduced, the volatilization process of the volatile liquid is slowed down, and the accuracy in the process of taking the volatile liquid is ensured.

In this embodiment, a connecting portion 203 is disposed at an end of the connecting tip 20 opposite to the end connected to the pipetting tip 10, and the connecting portion 203 is used for connecting to a pipette, that is, by pushing a piston rod in the pipette, the pipetting tip 10 can absorb liquid into an inner cavity of the connecting tip 20 for storage.

In this embodiment, the inventor can determine the length and the inner diameter of the pipetting head 102 according to the pipetting amount, and for a quantitative pipetting volume of 50 μ L, the pipetting head 102 can be set to have a capacity of about 47 μ L and a length of 19mm, the inner diameter of the conical cavity 1021 with a smaller caliber is 0.5mm, and the inner diameter of the conical cavity 1021 with a larger caliber is 2.4 mm; the inner diameter of the matching part 101 is set to be 5.14mm, the outer diameter is 6.28mm, and the length is 5mm of a long cylinder, one end of the long cylinder, which is back to the liquid transferring head 102, is connected with one end of the connecting suction head 20, which is back to the connecting part 203, and is used for transferring 50 mu L of volatile liquid; of course, the end of the long cylinder opposite to the pipetting head 102 may also be directly connected with a pipette for pipetting less than 45uL of non-volatile sample, which is not limited herein, and the inventor may reasonably select the end according to the actual use condition.

It should be noted that, the inner diameter of the connection suction head 20 is set to 0.8mm, the outer diameter is set to 5.2mm, the length is 30mm, the inner capacity is about 15 μ L, the connection suction head 20 is tightly combined with the outer circular surface of the outer wall of the connection suction head 20 through the inner circular cylindrical surface 1011 of the matching part 101, so as to realize the tight combination of the connection suction head 20 and the mobile connector, and one end surface of the connection suction head 20 inserted into the inner cavity of the matching part 101 is attached to the bottom surface of the inner cavity of the matching part 101, so that the diameter surface of the solution evaporation surface is changed from 2.4mm to 0.8mm, the evaporation area is reduced to 1/12 of the raw material, the evaporation speed can be greatly reduced, and the volume change of the solution caused by volatilization can be reduced.

In other embodiments, the connecting tip 20 of the present invention may be connected to a pipette independently, i.e., via the connecting portion 203 of the connecting tip 20, for removing less than 15uL of volatile liquid.

In this embodiment, the connection portion 203 is a hollow cylindrical structure, and the connection portion 203 has an inner diameter of 5.14mm, an outer diameter of 6.28mm, and a length of 5mm, and is used for connecting a pipette.

Finally, it should be noted that the pipetting volume can be adapted to different requirements by changing the pipetting tip 10, and the commonly used pipetting tips are 25 μ L, 50 μ L, 100 μ L and the like, and the inventors can reasonably select the pipetting tip according to the actual use condition, so that the condition of dropping liquid drops in the solution pipetting process can be obviously reduced, and the accuracy is obviously improved.

Example two:

as shown in FIG. 3, the present embodiment is different from the first embodiment in that the engaging portion 101 is different from the coupling structure of the suction head 20.

In this embodiment, an inner conical surface 1012 is disposed on the inner wall of the fitting portion 101, and an outer conical surface 202 capable of cooperating with the inner conical surface 1012 is disposed on the outer wall of the connecting suction head 20, so that the connecting suction head 20 and the fitting portion 101 can be tightly connected by cooperation between the inner conical surface 1012 and the outer conical surface 202. It can be seen that the connection structure of the connection tip 20 and the mating part 101 is realized by inserting one end of the connection tip 20 into the inner cavity of the mating part 101, and by the inner conical surface 1012 on the mating part 101 tightly fitting with the outer conical surface 202 on the connection tip 20. The inner wall of the fitting part 101 and the outer wall of the connection suction head 20 can be tightly attached and sealed by the fit between the inner conical surface 1012 and the outer conical surface 202, the sealing effect is good, and the liquid is prevented from overflowing from the gap at the connection part of the fitting part 101 and the connection suction head 20 in the process of absorbing the liquid.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. The utility model provides a volatile liquid ration sampling device, is liquid-transfering suction head (10) of open structure including both ends, its characterized in that: the device is characterized by further comprising a hollow connecting suction head (20) with the inner diameter smaller than that of the liquid transfer suction head (10), wherein the connecting suction head (20) can be connected with the liquid transfer suction head (10) and is used for containing volatile liquid sucked by the liquid transfer suction head (10).

2. The volatile liquid quantitative sampling device of claim 1, wherein: one end of the connecting sucker (20) can be inserted into the inner cavity of the liquid-transfering sucker (10) and is tightly connected with the side wall of the liquid-transfering sucker.

3. The volatile liquid quantitative sampling device of claim 2, wherein: liquid-transfering sucker (10) are open cooperation portion (101) including one end, the one end of connecting sucker (20) can in the open end of cooperation portion (101) inserts the inner chamber of cooperation portion (101) and with the inner chamber lateral wall zonulae occludens of cooperation portion (101).

4. The volatile liquid quantitative sampling device of claim 3, wherein: an inner conical surface (1012) is arranged on the inner wall of the matching part (101), and an outer conical surface (202) capable of being matched with the inner conical surface (1012) is arranged on the outer wall of the connecting suction head (20), so that the connecting suction head (20) and the matching part (101) can be tightly connected through the matching between the inner conical surface (1012) and the outer conical surface (202).

5. A volatile liquid quantitative sampling device, as claimed in claim 3, wherein: an inner cylindrical surface (1011) is arranged on the inner wall of the matching part (101), and an outer cylindrical surface (201) capable of being matched with the inner cylindrical surface (1011) is arranged on the outer wall of the connecting suction head (20), so that the connecting suction head (20) and the matching part (101) can be tightly connected through the matching between the inner cylindrical surface (1011) and the outer cylindrical surface (201).

6. A quantitative volatile liquid sampling device as claimed in claim 4 or 5, wherein: one end face of the connecting sucker (20) inserted into the inner cavity of the matching part (101) is abutted against the bottom face of the inner cavity of the matching part (101).

7. The volatile liquid quantitative sampling device of claim 6, wherein: the liquid transfer suction head (10) further comprises a liquid transfer head (102) with two open ends, the inner cavity of the liquid transfer head (102) is a conical cavity (1021), and one end with a large caliber of the cavity is connected with the matching part (101) and communicated with the inner diameter of the connecting suction head (20).

8. The volatile liquid quantitative sampling device of claim 1, wherein: the connecting sucker (20) is back to itself and is provided with a connecting part (203) at one end connected with the liquid-transfering sucker (10), and the connecting part (203) is used for being connected with a liquid-transfering device.