CN219463452U - Accurate control pipetting device - Google Patents

Abstract

The utility model provides a precise control pipetting device which comprises an injector and a pipette, wherein the injector is used for controlling the pipette to move; the injector comprises an injection tube, a piston and a push-pull rod, wherein two ends of the injection tube are communicated, an injection port is formed at one end of the injection tube, and an outlet for discharging air in the injection tube when the injector works is formed at the other end of the injection tube; the piston is sealed to be set up in the syringe, can follow the syringe axis direction activity, the push-and-pull rod sets up the piston deviates from the one end of injection port, the syringe deviates from the inner wall of one end of injection port is provided with spacing element, is used for restricting the piston orientation the motion distance of export is in order to control the extraction volume of syringe, the injection port communicates with the opening of pipette, the pipette lateral wall is provided with the scale mark, the pipette be used for with the syringe cooperation absorbs the liquid of settlement volume. The utility model aims to provide a precise control pipetting device capable of quantitatively sucking liquid without using an ear washing ball.

Description

Accurate control pipetting device

Technical Field

The utility model relates to the field of experimental instruments, in particular to a precise control pipetting device.

Background

Pipettes, also known as "quantitative pipettes", "pipettes" are an experimental instrument that is used specifically to measure the volume of a liquid and transfer it to other containers, often for biological or chemical experiments.

Laboratory is often done with an ear-bulb fitted pipette when the liquid is measured using a pipette. When the liquid is sucked, the ear washing ball is connected to the upper port (opening) of the pipette, the pipette is held by hands, the lower port (suction opening) of the pipette is immersed in the liquid to be sucked after the ear washing ball is pinched, and the liquid is sucked into the pipette after the ear washing ball is loosened; during liquid discharge, the ear ball is taken down, the upper port of the pipette is plugged by a finger, and then the gap is opened for the upper port of the pipette by removing the finger, so that liquid discharge is carried out. Sucking the solution into the pipette by squeezing the ear washing ball, wherein the volume of the solution sucked into the pipette is related to the squeezing degree of the ear washing ball, when the squeezing degree is too large, the sucked solution possibly overflows the pipette, so that part of the solution enters the ear washing ball, and when the squeezing degree is insufficient, the liquid level of the solution does not reach the requirement, and the operation needs to be restarted; when the liquid is discharged, the liquid discharging speed is difficult to control, the discharged liquid is easy to exceed the required liquid, the liquid suction failure is caused, and the liquid is required to be sucked again. Therefore, there is a need for a precisely controlled pipetting device that is capable of quantitatively pipetting liquids without the use of ear-washing balls.

Disclosure of Invention

The utility model mainly aims to provide a precise control pipetting device capable of quantitatively sucking liquid without using an ear washing ball.

In order to achieve the above purpose, the utility model provides a precise control pipetting device, which comprises a syringe and a pipette; the injector comprises an injection tube, a piston and a push-pull rod, wherein two ends of the injection tube are communicated, an injection port is formed at one end of the injection tube, and an outlet for discharging air in the injection tube when the injector works is formed at the other end of the injection tube; the piston is sealed to be set up in the syringe, the piston can be followed the syringe axis direction is movable, the push-and-pull rod sets up the piston deviates from the one end of injection port, the push-and-pull rod is followed the syringe axis direction extends the syringe, the syringe deviates from the inner wall of one end of injection port is provided with spacing component, spacing component is used for restricting the piston orientation the motion distance of export is in order to control the extraction volume of syringe, the injection port with the opening intercommunication of pipette, the pipette lateral wall is provided with the scale mark, the pipette be used for with the syringe cooperation absorbs the liquid of settlement volume.

Preferably, the syringe and the pipette are detachably connected through a communicating member, the communicating member is a through tubular structure, one end of the tubular structure is communicated with the injection port, and the other end of the tubular structure is communicated with the pipette opening.

Preferably, the precisely controlled pipetting device comprises a plurality of syringes of different withdrawal volumes, the injection port of each syringe being adapted to communicate with the communication member, the syringe of each different withdrawal volume being adapted to cooperate with the pipette to aspirate a different volume of liquid.

Preferably, the communicating part comprises a flexible connecting hose and a hard fixing tube, one end of the connecting hose is used for being sleeved at the injection port, the other end of the connecting hose is used for being sleeved at the opening of the pipette, and the fixing tube is used for being sleeved on the outer wall of the connecting hose so as to fix the syringe with the pipette.

Preferably, the pipette comprises a connecting pipe, a liquid storage element and a liquid suction pipe which are communicated in sequence, one end of the connecting pipe is an opening of the pipette, the other end of the connecting pipe is communicated with the liquid storage element, the diameter of the liquid storage element is respectively larger than that of the connecting pipe and that of the liquid suction pipe, one end of the liquid suction pipe is communicated with the liquid storage element, and the other end of the liquid suction pipe is a suction opening for sucking liquid.

Preferably, the accurate control pipetting device further comprises a flow regulating component, the side wall of the connecting pipe is communicated with a communicating pipe, the communicating pipe is used for connecting the flow regulating component, the flow regulating component comprises a pipeline and a flow switch capable of being opened and closed, one end of the pipeline is communicated with the communicating pipe, the other end of the pipeline is communicated with the atmosphere, when the flow switch is opened, the pipeline is used for introducing air into the communicating pipe, and the flow switch is closed and used for closing the pipeline; the connecting pipe and the side wall of the liquid storage element are provided with scale marks.

Preferably, the pipeline is a hose, the flow switch comprises a sphere and a plurality of protruding elements, the sphere and the plurality of protruding elements are arranged in the hose, and each protruding element is arranged along the length direction of the pipeline; the diameter of the sphere is in interference fit with the inner wall of the hose, each protruding element comprises a plurality of protrusions which are deleted along the axis of the hose and encircle the inner wall of the hose, and the protruding elements are used for limiting the movement of the sphere along the axis direction of the hose.

Preferably, the piston is rotatably arranged in the injection tube, a locking groove is formed in the side wall, in contact with the injection tube, of the piston, a locking element capable of sliding in cooperation with the locking groove is arranged on the inner wall of one end, facing away from the injection port, of the injection tube, and the locking element is used for rotating to cooperate with the locking groove to limit the movement of the piston along the axis direction of the injection tube after the syringe extracts a set volume of liquid.

Preferably, the locking element extends from the syringe inner wall towards the syringe axis forming a bulge, the locking groove comprising a guide section and a locking section, the guide section extending in a direction from the outlet towards the injection port to the locking section, the locking section extending circumferentially along the piston side wall.

Preferably, one end of the push-pull rod, which is far away from the piston, is provided with a push-pull element, one end of the push-pull element is connected with one end of the push-pull rod, which is far away from the piston, and the other end of the push-pull element is used for contacting with the finger of a user to push and pull the push-pull rod; the injection tube is directed away from the one end of injection port is provided with the pulling member, the pulling member forms the injection tube outer wall, the pulling member is along deviating from the export direction extends.

According to the technical scheme, the injector and the pipette are arranged, when liquid is required to be sucked, the injection port is communicated with the opening of the pipette, the suction port is immersed into the liquid to be sucked, and an operator only needs to pull the piston in the direction away from the injection port to suck the liquid without using an ear washing ball to be matched with the pipette to suck the liquid; use to wash the earball cooperation pipette and absorb liquid, the volume of absorbing liquid is decided by the dynamics of operating personnel extrusion earball, through the syringe sets up spacing component, operating personnel only need the orientation of deviating from the direction of injection mouth is stimulate the piston, after absorbing the liquid of setting for the volume, the piston can be blocked by spacing component, does not need operating personnel to come the decision to absorb the volume through control extrusion dynamics, can not absorb too much liquid, compares and uses to wash earball cooperation pipette to absorb liquid more accurate.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a precisely controlled pipetting device in accordance with one embodiment of the utility model;

FIG. 2 is a cross-sectional view of a precision control pipetting device;

FIG. 3 is a cross-sectional view of a syringe;

FIG. 4 is a schematic structural view of a flow regulating member;

FIG. 5 is a cross-sectional view of a flow regulating member;

FIG. 6 is a schematic structural view of a pipette;

fig. 7 is a schematic view of the internal structure of the syringe.

Reference numerals illustrate:

1-a syringe; 2-pipette; 3-a flow regulating member; 4-communicating means; 11-syringe; 12-a piston; 13-a push-pull rod; 14-a limiting element; 21-connecting pipes; 22-a reservoir element; 23-pipette; 31-a pipeline; 32-sphere; 33-a raised element; 111-a pull element; 112-a locking element; 121-a locking groove; 131-push-pull element; 211-communicating tube.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present utility model.

The utility model provides a precise control pipetting device.

Referring to fig. 1 to 7, the precisely controlled pipetting device includes a syringe 1 and a pipette 2; the injector 1 comprises an injection tube 11, a piston 12 and a push-pull rod 13, wherein two ends of the injection tube 11 are communicated, an injection port is formed at one end of the injection tube 11, and an outlet for discharging air in the injection tube 11 when the injector 1 works is formed at the other end of the injection tube 11; the piston 12 is arranged in the injection tube 11 in a sealing manner, the piston 12 can move along the axis direction of the injection tube 11, the push-pull rod 13 is arranged at one end of the piston 12, which is away from the injection port, the push-pull rod 13 extends out of the injection tube 11 along the axis direction of the injection tube 11, a limiting element 14 is arranged on the inner wall of one end of the injection tube 11, which is away from the injection port, the limiting element 14 is used for limiting the movement distance of the piston 12, which is towards the outlet, so as to control the extraction volume of the syringe 1, the injection port is communicated with the opening of the pipette 2, scale marks are arranged on the side wall of the pipette 2, and the pipette 2 is used for sucking a set volume of liquid in a matched manner with the syringe 1. In this embodiment, the syringe 11 is transparent or translucent, so that an operator can observe the movement state of each element in the syringe 11, so as to align the locking element 112 with the locking groove 121; in a preferred embodiment, the syringe 11 is a polycarbonate tube, a polymethyl methacrylate tube, or a polypropylene tube.

In the technical scheme of the utility model, the injector 1 and the pipette 2 are arranged, when liquid is required to be sucked, the injection port is communicated with the opening of the pipette 2, the suction port is immersed in the liquid to be sucked, and an operator only needs to pull the piston 12 in a direction away from the injection port, so that the liquid can be sucked, and the liquid is not required to be sucked by using the ear washing ball and the pipette 23; the liquid is sucked by using the ear washing ball matched with the pipette 2, the volume of the sucked liquid is determined by the force of the operator to squeeze the ear washing ball, the limiting element 14 is arranged by the injector 1, the operator only needs to pull the piston 12 towards the direction away from the injection port, after sucking the liquid with the set volume, the piston 12 can be clamped by the limiting element 14, the operator is not required to determine the sucked volume by controlling the squeezing force, excessive liquid cannot be sucked, and compared with the process of sucking the liquid by using the ear washing ball matched with the pipette 2, the liquid sucking is more accurate.

Referring to fig. 1, preferably, the syringe 1 and the pipette 2 are detachably connected through a communication component 4, the communication component 4 is a through tubular structure, one end of the tubular structure is communicated with the injection port, and the other end of the tubular structure is communicated with the opening of the pipette 2. In this embodiment, the tubular structure is a rubber hose, and the rubber hose has a certain elasticity, and can adapt to the injection ports and the pipettes 2 of different sizes, and of course, the material of the tubular structure is not limited in this way, and a person skilled in the art can adjust accordingly according to the actual use requirement.

Preferably, the precisely controlled pipetting device comprises a plurality of syringes 1 of different withdrawal volumes, the injection port of each syringe 1 being adapted to communicate with the communication member 4, each syringe 1 of different withdrawal volumes being adapted to cooperate with the pipette 2 to aspirate different volumes of liquid. When the liquid is actually measured, an operator can quantitatively suck the liquid with different volumes by replacing the syringes 1 with different extraction volumes.

Preferably, the communicating member 4 includes a flexible connection hose and a hard fixing tube, one end of the connection hose is used for being sleeved at the injection port, the other end of the connection hose is used for being sleeved at the opening of the pipette 2, and the fixing tube is used for being sleeved at the outer wall of the connection hose so as to fix the syringe 1 and the pipette 2. Through setting up flexible coupling hose, can adapt not pipette 2 of equidimension, only will through coupling hose syringe 1 with pipette 2 intercommunication, syringe 1 with be connected between the pipette 2 is firm inadequately, syringe 1 with easily produce between the pipette 2 and rock, take off easily, through setting up fixed pipe can with syringe 1 with pipette 2 connects more firmly together.

Referring to fig. 6, preferably, the pipette 2 includes a connection tube 21, a liquid storage element 22 and a liquid suction tube 23 that are sequentially connected, one end of the connection tube 21 is an opening of the pipette 2, the other end of the connection tube 21 is connected to the liquid storage element 22, the diameter of the liquid storage element 22 is larger than the diameter of the connection tube 21 and the diameter of the liquid suction tube 23, one end of the liquid suction tube 23 is connected to the liquid storage element 22, and the other end is a suction port for sucking liquid. In this embodiment, the liquid storage element 22 is a hollow spherical structure, and the scale marks are disposed on the connecting pipe 21 and/or the liquid storage element 22.

Preferably, the accurate control pipetting device further comprises a flow regulating component 3, a communicating pipe 211 is communicated with the side wall of the connecting pipe 21, the communicating pipe 211 is used for connecting the flow regulating component 3, the flow regulating component 3 comprises a pipeline 31 and a flow switch capable of being opened and closed, one end of the pipeline 31 is communicated with the communicating pipe 211, the other end of the pipeline 31 is communicated with the atmosphere, when the flow switch is opened, the pipeline 31 is used for introducing air into the communicating pipe 211, and when the flow switch is closed, the pipeline 31 is used for closing. When liquid is sucked, the flow switch is closed, the piston 12 is pulled to deviate from the injection port to move through the push-pull rod 13, the air pressure in the accurate control pipetting device is reduced, the liquid can be sucked, when the sucked liquid needs to be discharged, the flow switch is opened, the air is led into the pipette 2, and the air pressure in the accurate control pipetting device is increased, so that the sucked liquid can be discharged.

Referring to fig. 4 and 5, preferably, the pipe 31 is a hose, the flow switch includes a ball 32 and a plurality of protruding elements 33, the ball 32 and the plurality of protruding elements 33 are disposed in the hose, and each protruding element 33 is disposed along the length direction of the pipe; the ball 32 has a diameter that is in an interference fit with the inner wall of the hose, and each of the protrusion elements 33 includes a plurality of protrusions that are removed around the inner wall of the hose along the axis of the hose, and the plurality of protrusion elements 33 are configured to limit movement of the ball 32 in the direction of the axis of the hose. When the liquid is sucked, the sphere 32 seals the hose, and when the sucked liquid needs to be discharged, an operator presses the sphere 32 through the hose, so that a gap is formed between the inner wall of the hose and the sphere 32, air enters the accurate control pipetting device through the gap, the sucked liquid can be discharged, and the sphere 32 can be restricted from being separated from the hose by arranging the convex element 33; in this embodiment, the ball 32 and the plurality of protruding elements 33 are glass structures.

Referring to fig. 3 and 7, preferably, the piston 12 is rotatably disposed in the syringe 11, a locking groove 121 is disposed on a side wall of the piston 12 contacting the syringe 11, a locking element 112 capable of sliding in cooperation with the locking groove 121 is disposed on an inner wall of an end of the syringe 11 facing away from the injection port, and the locking element 112 is used for rotating to cooperate with the locking groove 121 to limit movement of the piston 12 along an axial direction of the syringe 11 after the syringe 1 extracts a set volume of liquid. When an operator pulls the piston 12, the guide section of the locking groove 121 is aligned with the locking section 112, and pulls the push-pull rod 13, so that the locking section 112 slides along the guide section to the communication position between the guide section and the locking section, and then the piston 12 is rotated, so that the locking section 112 slides into the locking section, and at the moment, the locking section 112 and the locking section are matched and locked to limit the movement of the piston 12 along the axial direction of the injection tube 11; this design prevents the operator from touching the push-pull rod 13 by mistake, so that the piston 12 moves along the axis of the syringe 11, resulting in the outflow of the liquid sucked up in the pipette 2.

Referring to fig. 3 and 7, preferably, the locking element 112 extends from the inner wall of the syringe 11 toward the axis of the syringe 11 to form a protrusion, and the locking groove 121 includes a guide section extending from the outlet toward the injection port to the locking section and a locking section extending circumferentially along the side wall of the piston 12. In the present embodiment, the locking element 112 is a cylindrical structure, the locking groove 121 has a zigzag structure, however, the shape of the locking element 112 is not limited thereto, and other structures, such as an L-shaped structure, may be adopted for the locking groove 121.

Preferably, a push-pull element 131 is arranged at one end of the push-pull rod 13 away from the piston 12, one end of the push-pull element 131 is connected with one end of the push-pull rod 13 away from the piston 12, and the other end of the push-pull element 131 is used for contacting the finger of a user to push and pull the push-pull rod 13; the injection tube 11 is provided with a pulling element 111 at an end facing away from the injection port, the pulling element 111 being formed at the outer wall of the injection tube 11, the pulling element 111 extending in a direction facing away from the outlet. By providing the push-pull element 131 and the pull element 111, an operator can more conveniently operate the syringe 1 to aspirate liquid; in this embodiment, the push-pull element 131 is a circular sheet, and of course, the shape of the push-pull element 131 is not limited thereto, and those skilled in the art can adjust accordingly according to actual use requirements.

The foregoing description of the preferred embodiments of the present utility model should not be construed as limiting the scope of the utility model, but rather utilizing equivalent structural changes made in the present utility model description and drawings or directly/indirectly applied to other related technical fields are included in the scope of the present utility model.

Claims (10)

1. The accurate control pipetting device is characterized by comprising a syringe and a pipette; the injector comprises an injection tube, a piston and a push-pull rod, wherein two ends of the injection tube are communicated, an injection port is formed at one end of the injection tube, and an outlet for discharging air in the injection tube when the injector works is formed at the other end of the injection tube; the piston is sealed to be set up in the syringe, the piston can be followed the syringe axis direction is movable, the push-and-pull rod sets up the piston deviates from the one end of injection port, the push-and-pull rod is followed the syringe axis direction extends the syringe, the syringe deviates from the inner wall of one end of injection port is provided with spacing component, spacing component is used for restricting the piston orientation the motion distance of export is in order to control the extraction volume of syringe, the injection port with the opening intercommunication of pipette, the pipette lateral wall is provided with the scale mark, the pipette be used for with the syringe cooperation absorbs the liquid of settlement volume.

2. The precision control pipetting device of claim 1 wherein the syringe and pipette are detachably connected by a communication member that is a tubular member that is through, one end of the tubular member being in communication with the injection port and the other end of the tubular member being in communication with the pipette opening.

3. The precision control pipetting device of claim 2, comprising a plurality of syringes of differing withdrawal volumes, each syringe having an injection port for communicating with the communicating member, each syringe of differing withdrawal volumes for cooperating with the pipette to aspirate a different volume of liquid.

4. The precision control pipetting device of claim 2, wherein the communication component comprises a flexible connecting hose and a hard fixing tube, one end of the connecting hose is used for being sleeved at the injection port, the other end of the connecting hose is used for being sleeved at an opening of the pipette, and the fixing tube is used for being sleeved at the outer wall of the connecting hose to fix the syringe and the pipette.

5. The precision control pipetting device of claim 1, wherein the pipette comprises a connecting tube, a liquid storage element and a pipette which are communicated in sequence, one end of the connecting tube is an opening of the pipette, the other end of the connecting tube is communicated with the liquid storage element, the diameter of the liquid storage element is respectively larger than the diameter of the connecting tube and the diameter of the pipette, one end of the pipette is communicated with the liquid storage element, and the other end of the pipette is a sucking port for sucking liquid.

6. The precision control pipetting device as recited in claim 5 further comprising a flow regulating member, wherein a communicating tube is connected to the side wall of the connecting tube, the communicating tube is used for connecting the flow regulating member, the flow regulating member comprises a pipeline and a flow switch capable of opening and closing, one end of the pipeline is connected with the communicating tube, the other end of the pipeline is connected with the atmosphere, and when the flow switch is opened, the pipeline is used for introducing air into the communicating tube, and the flow switch is closed for closing the pipeline; the connecting pipe and the side wall of the liquid storage element are provided with scale marks.

7. The precision control pipetting device of claim 6 wherein the tubing is a hose and the flow switch comprises a sphere and a plurality of raised elements, the sphere and the plurality of raised elements being disposed within the hose, each raised element being disposed along a length of the tubing; the diameter of the sphere is in interference fit with the inner wall of the hose, each protruding element comprises a plurality of protrusions which are deleted along the axis of the hose and encircle the inner wall of the hose, and the protruding elements are used for limiting the movement of the sphere along the axis direction of the hose.

8. The precision control pipetting device according to claim 1, wherein the piston is rotatably arranged in the syringe, a locking groove is formed in a side wall of the piston, which is in contact with the syringe, an inner wall of one end of the syringe, which is away from the injection port, is provided with a locking element capable of sliding in cooperation with the locking groove, and the locking element is used for rotating to cooperate with the locking groove to limit the movement of the piston in the axial direction of the syringe after the syringe extracts a set volume of liquid.

9. The precision control pipetting device of claim 8 wherein the locking element extends from the syringe inner wall toward the syringe axis forming a projection, the locking groove comprising a guide section and a locking section, the guide section extending in a direction from the outlet toward the injection port to the locking section, the locking section extending circumferentially along the piston side wall.

10. The precision control pipetting device according to any one of claims 1 to 9, wherein one end of the push-pull rod facing away from the piston is provided with a push-pull element, one end of the push-pull element being connected to one end of the push-pull rod facing away from the piston, the other end of the push-pull element being adapted to contact a user's finger for pushing and pulling the push-pull rod; the injection tube is directed away from the one end of injection port is provided with the pulling member, the pulling member forms the injection tube outer wall, the pulling member is along deviating from the export direction extends.