CN212576319U

CN212576319U - Liquid transfer device

Info

Publication number: CN212576319U
Application number: CN202020820387.6U
Authority: CN
Inventors: 倪兵; 唐隽; 仲志婷
Original assignee: Army Medical University; 901th Hospital of the Joint Logistics Support Force of Pla
Current assignee: Army Medical University; 901th Hospital of the Joint Logistics Support Force of Pla
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2021-02-23
Anticipated expiration: 2030-05-15

Abstract

The utility model belongs to the technical field of biochemistry and medical equipment, and provides a liquid transfer device, which comprises a shell and a piston arranged in the shell, and also comprises a controller, a driving motor, a screw nut structure and two sensors, the controller is arranged on the shell, the driving motor is arranged in the shell and is electrically connected with the controller, the screw nut structure is arranged in the shell, and the screw of the screw-nut structure is connected with the power output shaft of the driving motor, the nut of the screw-nut structure is fixedly connected with the piston through a piston rod, the two sensors are oppositely arranged in the shell, electrically connected with the controller and respectively positioned at two ends of the screw, and the piston rod is provided with an induction part matched with the first sensor and the second sensor. The utility model provides a pipettor move liquid precision is higher.

Description

Liquid transfer device

Technical Field

The utility model relates to a biochemistry and medical equipment technical field, concretely relates to pipettor.

Background

A liquid transfer device, also called a liquid transfer gun, is a metering tool for transferring liquid from an original container to another container within a certain range, and is widely used in the fields of biology, chemistry and the like.

However, most of the conventional pipettes are manual piston pipettes, and the liquid suction speed is manually controlled by an operator, resulting in low suction accuracy. When the existing electric pipette is used, an operator needs to constantly observe the liquid level height to determine whether the required liquid level is reached, and the accuracy is poor due to the influence of various factors such as operator reaction and the like.

SUMMERY OF THE UTILITY MODEL

To the defect among the prior art, the utility model aims at providing a pipettor to improve and move liquid precision.

In order to achieve the purpose, the utility model provides a liquid transfer device, which comprises a shell, a piston arranged in the shell, a controller, a driving motor, a screw nut structure and two sensors,

the controller is arranged on the shell body,

the driving motor is arranged in the shell and is electrically connected with the controller,

the screw-nut structure is arranged in the shell, a screw of the screw-nut structure is connected with a power output shaft of the driving motor, a nut of the screw-nut structure is fixedly connected with the piston through a piston rod,

the two sensors are oppositely arranged in the shell, electrically connected with the controller and respectively positioned at two ends of the lead screw,

and the piston rod is provided with an induction part matched with the first sensor and the second sensor.

Further, still include: the adjusting device is in threaded connection with the shell, one of the two sensors close to the piston is fixedly connected with the shell, and one of the two sensors far away from the piston is in sliding connection with the shell, is in rotating connection with the adjusting device and can move along with the movement of the adjusting device.

Further, a scale mark for displaying the current pipetting range is arranged on the shell.

Further, a sealing ring is arranged on the periphery of the piston.

Further, the number of the sealing rings is multiple.

The utility model has the advantages that:

the utility model provides a pipettor comes the stroke of control piston through setting up two inductors to the volume of liquid is moved in control, and then has improved the precision of moving the liquid. Meanwhile, the liquid transfer device is also provided with an adjusting device, and the stroke of the piston is changed by adjusting the adjusting device, so that the practicability of the liquid transfer device is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a perspective view of a pipette according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of the pipette shown in fig. 1;

FIG. 3 is an enlarged view taken at A of FIG. 1;

FIG. 4 is an enlarged view at B shown in FIG. 2;

FIG. 5 is an enlarged view at C shown in FIG. 2;

fig. 6 is a sectional view in the direction D-D shown in fig. 2.

Reference numerals:

the device comprises a shell 1, a piston cavity 11, a scale mark 12, a piston 2, a sealing ring 21, a controller 3, a driving motor 4, a screw-nut structure 5, a screw 51, a screw nut 52, a sensor 6, an adjusting device 7, a piston rod 8 and an induction part 81.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience of description and simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1-5, the utility model provides a pipette, including casing 1 and the piston 2 of installing in casing 1, specifically, casing 1 has seted up piston cavity 11, and piston 2 installs in piston cavity 11 and keeps sealed with casing 1. Thus, when the piston 2 moves in the housing 1, negative pressure is formed in the housing 1, thereby achieving the purpose of sucking the liquid to be moved.

The pipettor further comprises a controller 3, a driving motor 4, a screw nut structure 5 and two sensors 6.

A controller 3 is mounted on the housing 1 for controlling the movement of the drive motor 4. Specifically, the controller 3 includes:

the main switch is used for turning on the power supply of the liquid moving device when the main switch is pressed;

the liquid suction switch is pressed, and the liquid suction device starts to suck liquid;

and when the liquid drainage switch is pressed down, the liquid suction device starts to drain liquid.

The driving motor 4 is fixedly installed in the housing 1 and electrically connected with the controller 3.

The screw nut structure 5 is installed in the housing 1, a screw 51 of the screw nut structure 5 is connected with a power output shaft of the driving motor 4, and a nut 52 of the screw nut structure 5 is fixedly connected with the piston 2 through a piston 2 rod. Thus, when the driving motor 4 drives the screw 51 to rotate, the nut 52 is driven to move, and the piston 2 is driven to move.

Two sensors 6 are oppositely arranged in the housing 1, electrically connected with the controller 3 and respectively located at two ends of the lead screw 51. By providing two sensors 6, the stroke of the piston 2 is controlled, and thus the volume of liquid drawn. The volume is equal to the cross-sectional area of the piston chamber 11 multiplied by the stroke of the piston 2. Without the operator controlling the volume to be pipetted. Thereby improving the pipetting accuracy.

And a sensing part 81 matched with the two sensors 6 is installed on the piston 2 rod.

Thus, when the sensing portion 81 contacts one of the two sensors 6, the driving motor 4 stops operating. This controls the stroke of the piston 2.

In one embodiment, further comprising: the adjusting device 7 is in threaded connection with the housing 1, and one sensor 6 of the two sensors 6 close to the piston 2 is fixedly connected with the housing 1, namely, the sensor 6 positioned below is fixedly connected with the housing 1. One of the two sensors 6, which is remote from the piston 2, is connected to the housing 1 in a sliding manner and to the adjusting device 7 in a rotating manner and can be displaced as the adjusting device 7 is displaced, i.e. the upper one of the two sensors 6 is connected to the housing 1 in a sliding manner.

Thus, by screwing the adjusting device 7, the adjusting device 7 moves on the housing 1, thereby moving the sensor 6 connected thereto, and further changing the distance between the two sensors 6, i.e. the stroke of the piston 2, and thus the volume of the liquid to be sucked. Therefore, the adaptability of the liquid transfer device is improved, and the liquid transfer device can meet the actual requirement.

In one embodiment, a graduation mark 12 for displaying the current pipetting range is arranged on the housing 1. When in use, the adjusting device 7 is screwed to correspond to the scale marks 12. This indicates the amount of pipette volume that the pipette can remove as represented by the current tick mark 12. So that the current pipetting range can be observed and the pipetting range can be adjusted conveniently.

In one embodiment, a seal ring 21 is mounted on the periphery of the piston 2. The sealing effect between the piston 2 and the housing 1 is better by arranging the sealing ring 21, and meanwhile, the abrasion between the housing 1 and the piston 2 can be reduced by the sealing ring 21.

In one embodiment, the number of the seal rings 21 is plural. The provision of a plurality of seal rings 21 provides a better sealing effect.

The working principle of the utility model is as follows:

when in use, before liquid is transferred, the adjusting device 7 is adjusted to the liquid range where the liquid needs to be transferred. Then, the pipette is started, the liquid discharge switch is firstly pressed, and the controller 3 controls the driving motor 4 to drive the screw 51 to rotate in the forward direction, so that the piston 2 is driven to move downwards to discharge air in the pipette.

Then the liquid transferring head of the liquid transferring device is placed below the liquid level of the liquid to be transferred. When the liquid suction switch is pressed down, the controller 3 controls the driving motor 4 to drive the driving screw 51 to rotate reversely, so that the piston 2 is driven to move upwards, negative pressure is formed in the piston cavity 11, and liquid to be moved is sucked.

When the pipette is aligned with the pipette container, the liquid discharge switch is pressed again, and the controller 3 controls the driving motor 4 to drive the screw 51 to rotate in the forward direction, so as to drive the piston 2 to move downward to discharge the liquid in the pipette.

The utility model provides a pipettor moves liquid volume through inductor control for it is higher to move the liquid precision.

In the specification of the present invention, a large number of specific details are explained. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims

1. A pipettor, includes the casing and sets up the piston in the casing, its characterized in that: also comprises a controller, a driving motor, a screw nut structure and two sensors,

the controller is arranged on the shell body,

and the piston rod is provided with a sensing part matched with the two sensors.

2. A pipette as defined in claim 1, wherein: further comprising: the adjusting device is in threaded connection with the shell, one of the two sensors close to the piston is fixedly connected with the shell, and one of the two sensors far away from the piston is in sliding connection with the shell, is in rotating connection with the adjusting device and can move along with the movement of the adjusting device.

3. A pipette as defined in claim 1, wherein: and the shell is provided with scale marks for displaying the current pipetting range.

4. A pipette as defined in claim 1, wherein: and a sealing ring is arranged on the periphery of the piston.

5. The pipette according to claim 4, characterized in that: the quantity of sealing washer is a plurality of.