CN219721434U

CN219721434U - Suction tube joint and pipettor

Info

Publication number: CN219721434U
Application number: CN202320427903.2U
Authority: CN
Inventors: 张长弓; 骆俊魁
Original assignee: Naiyou Biotechnology Shanghai Co ltd
Current assignee: Naiyou Biotechnology Shanghai Co ltd
Priority date: 2022-12-22
Filing date: 2023-03-08
Publication date: 2023-09-22
Anticipated expiration: 2033-03-08
Also published as: CN116212992A

Abstract

The utility model relates to a suction tube joint and a pipettor, which comprises: the suction pipe joint comprises a suction pipe joint body, wherein a through hole for gas or liquid to circulate is formed in the suction pipe joint body, a first connecting part is formed at one end of the suction pipe joint body, and a second connecting part is formed at the other end of the suction pipe joint body; two ends of the through hole respectively penetrate through the first connecting part and the second connecting part; and a wrapping part is arranged on the side wall of the second connecting part far away from the end surface of the second connecting part. After adopting above-mentioned structure, its beneficial effect is: the wrapping part is made of high-elasticity wear-resistant materials, and a mode of rubber coating molding or sticking by using adhesives such as glue is adopted between the wrapping part and the suction pipe joint; therefore, the wrapping part cannot loosen or displace with the suction pipe joint in the use process, and cannot twist.

Description

Suction tube joint and pipettor

Technical Field

The utility model belongs to the technical field of medical instruments, and particularly relates to a suction tube connector and a pipette.

Background

In the life science field, the operation of sucking and discharging liquid is often needed in the experiment; in this case, a pipette is often used to perform operations of sucking in a liquid, discharging the liquid, and then removing the pipette. In this case, the air tightness between the pipette and the pipette tip is an important requirement when sucking and discharging liquid.

The suction head has various specifications according to the liquid suction volume and the respective standards of different suppliers; the suction heads with the same specification have certain dimensional tolerance between products of different batches and different manufacturers; the pipette also needs to be matched according to the size of the tip mounting adapter and as many tolerance as possible are required; this is required for either manual pipettes or automated pipetting devices.

The part of the pipette, which is matched with the suction head in an installation way, is a suction pipe joint. Because the suction head needs to be inserted to form a seal, a certain installation force is needed; after the experimental process is finished, the suction head is required to be retracted by manual operation or other mechanisms, and the retraction force is required to be born; therefore, the suction pipe joint needs to have certain strength, and the sealing structure needs to achieve the sealing effect, and has certain solvent resistance and friction resistance while considering the suction head tolerance as much as possible.

When sucking and discharging liquid, one end of the suction pipe joint is inserted into an inner hole at the top of the suction head, and the other end is connected with the liquid transfer device; as shown in fig. 1, the suction pipe joint 1 and the inner wall of the suction head 2 need to be sealed; the seal between the suction fitting 1 and the suction head 2 is now generally of the three types:

first kind: a groove is formed in the groove part of the suction pipe joint matched with the suction head, and an O-shaped ring is arranged; the O-shaped ring is used for being compressed when the suction head is installed, so that the suction head and the suction pipe joint are sealed; the advantages are that the standard O-shaped ring can be utilized, and certain compatibility is realized for the self tolerance of the suction pipe joint, in particular the dimensional tolerance of the suction head; and when the O-shaped ring is worn and cannot be sealed, the O-shaped ring can be replaced simply and manually; the suction head is not influenced, and the suction head can be repeatedly used; in addition, because the standard O-shaped ring has a relatively small wire diameter, the compression amount of the O-shaped ring is usually about 0.5 to 1mm, and the O-shaped ring is usually 10 to 20 percent, so that the tolerance and capacity are limited; under individual conditions, the O-shaped ring is easy to twist or turn over by itself under external friction force in the use process, so that the contact surface is uneven, liquid leakage is caused, and the service life of the O-shaped ring is further influenced.

Second kind: forming a whole circle of convex shape at the groove part of the suction pipe joint matched with the suction head; when the suction head is installed, a certain force is needed to be used for inserting the suction head, so that the suction head is locally deformed and expanded; the suction pipe joint is closely attached to the suction head part to realize sealing; the structure has the opposite advantages that the sealing part of the suction pipe joint is the suction pipe joint, the material of the suction pipe joint is hard plastic or metal, and the suction pipe joint is more wear-resistant and has longer service life compared with an O-shaped ring; however, it is apparent that its dimensional tolerance compatibility is low, the suction tube fitting is poorly compatible with consumables, and the forces for installing and withdrawing the suction head are large; if the liquid dispenser is a manual liquid dispenser, the relative operation is laborious; in the case of automated devices, particularly multichannel pipettes, such as 18, 96 or more channels, the force required to mount and withdraw the pipette tip is high for the strength and power requirements of the entire mechanism; in addition, the suction head used in the form can not be repeatedly used for a plurality of times due to deformation and friction in the use process; after multiple installation and withdrawal, the sealing requirements cannot be met, and leakage occurs.

Third kind: similar to the second form, the installation part of the suction tube joint matched with the suction head is designed into a conical surface, and the angle of the installation part is the same as that of the groove part of the suction head; in a certain range, the surface fitting is realized to achieve the sealing effect; the installation force thereof may be greater than the second one; its advantages are basically the same as the second one.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides the suction pipe joint and the pipettor, which have larger consumable installation compression amount and adaptation compatibility compared with the traditional O-shaped ring, and the larger sectional area is also beneficial to prolonging the service life; has a longer life than the O-ring structure.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

as a first aspect of the present utility model, there is provided a suction tube fitting comprising: the suction pipe joint comprises a suction pipe joint body, wherein a through hole for gas or liquid to circulate is formed in the suction pipe joint body, a first connecting part is formed at one end of the suction pipe joint body, and a second connecting part is formed at the other end of the suction pipe joint body; two ends of the through hole respectively penetrate through the first connecting part and the second connecting part; and a wrapping part is arranged on the side wall of the second connecting part far away from the end surface of the second connecting part.

Alternatively, the outer wall of the wrapping portion far from the bottom of the wrapping portion is formed with a convex portion continuously larger or partially continuously larger than the bottom dimension of the wrapping portion.

Optionally, a groove part is formed on the side wall of the second connecting part far away from the end face of the second connecting part, and the wrapping part fills the groove part.

Optionally, the groove part is provided with a first contact part for preventing the wrapping part from overturning, and the wrapping part is provided with a second contact part which is full of the first contact part.

Alternatively, the first connecting part is detachably connected with the liquid sucking and discharging part of the liquid dispenser.

Alternatively, the wrapping part and the groove part are formed by die encapsulation.

Alternatively, the wrapping portion and the groove portion are connected by an adhesive.

Alternatively, the wrap is made of a highly elastic wear resistant material.

Optionally, the contact surface of the wrapping part and the second connecting part is a rough surface.

As a second aspect of the present utility model, there is provided a pipette including the suction tube joint as described above.

The suction pipe joint and the pipettor have the beneficial effects that: 1. the wrapping part and the suction tube joint are formed by adopting a mold for encapsulation, or are stuck by using adhesives such as glue; therefore, the wrapping part cannot loosen or displace with the suction pipe joint in the use process, and cannot twist and the like; the wrapping part is made of high-elasticity wear-resistant materials; the wrapping part has certain hardness and solvent resistance, and adopts materials such as silica gel or nitrile rubber; the shape of the material is designed according to different consumable materials; compared with the traditional O-shaped ring, the O-shaped ring has larger consumable mounting compression amount, and the larger sectional area is beneficial to prolonging the service life; the wrapping part can be fully fixed with the suction tube joint; has a longer life than the O-ring structure.

2. Unlike the replacement mode of the traditional 0-shaped ring, the suction pipe joint is replaced integrally when being replaced, and the suction pipe joint is replaced integrally only aiming at the 0-shaped ring in the prior art, so that better sealing performance can be kept, and further waste or loss of a sample is avoided.

3. Compared with an O-shaped ring, the wrapping part is limited at the first contact part of the groove part, so that the wrapping part is not easy to turn over, does not leak due to abrasion, and has long service life.

4. Compared with the O-shaped ring, the consumable mounting compression amount of the wrapping part is larger, more consumable materials with different sizes can be adapted, the O-shaped ring is fixed in cross section shape and size specification based on the shape characteristic of the O-shaped ring, the wrapping body is of a special-shaped structure with a non-circular cross section, the thickness of the convex part can be adjusted, and the consumable mounting compression amount is larger.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.

FIG. 1 is a schematic view of a prior art suction fitting and suction head;

fig. 2 is a schematic structural view of a suction pipe joint according to embodiment 1 of the present utility model;

fig. 3 is a structural sectional view of the suction pipe joint of embodiment 1 of the present utility model;

fig. 4 is a schematic structural view of a suction pipe joint according to embodiment 2 of the present utility model;

fig. 5 is a structural sectional view of the suction pipe joint of embodiment 2 of the present utility model.

Detailed Description

The utility model will be better explained for understanding by referring to the following detailed description of the embodiments in conjunction with the accompanying drawings.

The suction pipe joint and the pipettor solve the problem of tightness of the joint of the suction pipe joint and the suction head in the prior art, and the wrapping part is designed at the groove part where the suction pipe joint and the suction head are matched, so that the sealing performance and the service life performance are both achieved.

The technical scheme of the embodiment of the utility model aims to solve the problem of tightness, and the general idea is as follows: by arranging the wrapping part, the sealing performance and the service life performance are both realized.

Example 1

A suction tube fitting according to an embodiment of the present utility model, as shown in fig. 2 and 3, includes: a suction tube joint body 3, wherein a through hole 31 for gas or liquid to circulate is formed in the suction tube joint body 3, a first connecting part 32 detachably connected with a liquid sucking and discharging part of a liquid dispenser is formed at one end of the suction tube joint body 3, and a second connecting part 33 is formed at the other end of the suction tube joint body 3; both ends of the through hole 31 penetrate through the first connection portion 32 and the second connection portion 33, respectively; the side wall of the second connecting part 33 far away from the end surface of the second connecting part 33 is provided with a wrapping part 4; the connection manner of the wrapping portion 4 and the second connection portion 33 includes, but is not limited to, a form of over-molding by a mold or adhering using an adhesive such as glue.

It should be noted that, the connection manner between the first connection portion 32 and the liquid sucking and discharging portion of the liquid dispenser includes, but is not limited to, threaded connection, slot connection or magnetic connection, and the specific structure of the threaded connection, slot connection or magnetic connection is the prior art and will not be described again.

Alternatively, the contact surface between the wrapping portion 4 and the second connecting portion 33 is a rough surface, so that the friction force of the wrapping portion 4 is increased, and the connection between the wrapping portion 4 and the second connecting portion 33 is more fit, so that the wrapping portion is not easy to turn over, and leakage caused by abrasion is avoided.

Example 2

Example 2 differs from example 1 in that: the wrapping portion 4 has a different structure, as shown in fig. 4 to 5, specifically: in this embodiment, the outer wall of the wrapping portion 4 away from the bottom of the wrapping portion 4 is formed with a convex portion 41 continuously larger than or partially continuously larger than the bottom of the wrapping portion 4, and the shape of the convex portion 41 is inverted cone, etc.; the convex portion 41 may be a partially convex shaped structure or the like; compared with the traditional O-shaped ring, the convex part 41 has larger consumable installation compression amount, and the larger sectional area is beneficial to prolonging the service life; the convex part 41 of the wrapping part 4 can be fully fixed with the suction tube joint; compared with the O-shaped ring structure, the sealing ring has longer service life, and the sealing ring needs to be replaced together with the whole or part of the suction pipe joint during replacement, so that better sealing performance can be maintained, and further waste or loss of samples is avoided.

Note that, when the number of the convex portions 41 is two or more, the adjacent convex portions 41 are arranged at intervals, and the outer diameter of the convex portion 41 located above is larger than the outer diameter of the convex portion 41 located below; by this arrangement, the convex portion 41 can be sufficiently fixed to the suction tube connector, so that a larger contact area is provided between the convex portion and the suction tube connector, and leakage of the sample is avoided.

Further, a groove portion 34 is formed on a side wall of the second connecting portion 33 away from the end face of the second connecting portion 33, and the wrapping portion 4 fills the groove portion 34; the wrapping part 4 and the groove part 34 are formed by die encapsulation; or the wrapping part 4 and the groove part 34 are connected by an adhesive; in this way, the wrapping part 4 cannot loosen or displace with the suction pipe joint in the use process, and cannot twist and the like; the wrapping part 4 is made of high-elasticity wear-resistant material, has certain hardness and solvent resistance, and is made of high silica gel or nitrile rubber and other materials, and the shape of the wrapping part is designed according to different consumable materials.

It should be noted that the cross-sectional shape of the groove 34 is not limited to the groove shape described in the present utility model, and a corresponding technical effect can be achieved by using a T shape or other irregular pattern.

Further, in this embodiment, the groove 34 is provided with a first contact portion 341 for preventing the wrapping portion 4 from overturning, and the wrapping portion 4 is provided with a second contact portion that is full of the first contact portion 341; the wrapping part 4 is limited at the first contact part 341 of the groove part 34, so that the wrapping part is not easy to turn over, and leakage caused by abrasion is avoided.

As another embodiment of the present utility model, there is provided a pipette including: such as the suction fitting described above.

From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects: 1. the wrapping part and the suction tube joint are formed by adopting a mold for encapsulation, or are stuck by using adhesives such as glue; therefore, the wrapping part cannot loosen or displace with the suction pipe joint in the use process, and cannot twist and the like; the wrapping part is made of high-elasticity wear-resistant materials; the wrapping part has certain hardness and solvent resistance, and adopts materials such as silica gel or nitrile rubber; the shape of the material is designed according to different consumable materials; compared with the traditional O-shaped ring, the O-shaped ring has larger consumable mounting compression amount, and the larger sectional area is beneficial to prolonging the service life; the wrapping part can be fully fixed with the suction tube joint; has a longer life than the O-ring structure.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and apparatus should be considered part of the specification. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly as such and may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The foregoing description is only of the preferred embodiments of the utility model, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A suction tube fitting, comprising: the suction pipe joint comprises a suction pipe joint body, wherein a through hole for gas or liquid to circulate is formed in the suction pipe joint body, a first connecting part is formed at one end of the suction pipe joint body, and a second connecting part is formed at the other end of the suction pipe joint body; two ends of the through hole respectively penetrate through the first connecting part and the second connecting part; and a wrapping part is arranged on the side wall of the second connecting part far away from the end surface of the second connecting part.

2. The suction pipe joint as claimed in claim 1, wherein the outer wall of the packing portion remote from the bottom of the packing portion is formed with a protrusion continuously larger or partially continuously larger than the bottom size of the packing portion.

3. The suction tube fitting of claim 1 or 2, wherein a groove portion is provided in a side wall of the second connecting portion remote from an end face of the second connecting portion, and the wrapping portion fills the groove portion.

4. The suction pipe joint as claimed in claim 3, wherein the groove portion is provided with a first contact portion for preventing the wrap portion from being turned over, and the wrap portion is provided with a second contact portion which is filled with the first contact portion.

5. The suction tube connector of claim 1 or 2, wherein the first connection portion is detachably connected to a suction/discharge portion of a pipette.

6. A suction pipe joint as claimed in claim 3, wherein said wrapping portion and said groove portion are over-molded by a mold.

7. A suction pipe joint according to claim 3, wherein the wrapping portion and the groove portion are connected by an adhesive.

8. The suction tube fitting of claim 1 or 2, wherein the wrap is made of a highly elastic wear resistant material.

9. The suction tube fitting of claim 1 or 2, wherein the contact surface of the wrap portion and the second connecting portion is a roughened surface.

10. A pipette comprising a suction fitting according to any one of claims 1 to 9.