CN108970661B

CN108970661B - Manual pipettor

Info

Publication number: CN108970661B
Application number: CN201810817968.1A
Authority: CN
Inventors: 魏春阳; 曾静; 李少祥
Original assignee: Wuhan Research Institute of Metallurgical Construction Co Ltd
Current assignee: Wuhan Research Institute of Metallurgical Construction Co Ltd
Priority date: 2018-07-23
Filing date: 2018-07-23
Publication date: 2021-04-27
Anticipated expiration: 2038-07-23
Also published as: CN108970661A

Abstract

The invention provides a manual pipettor, which comprises a shell, wherein an inner cavity of the manual pipettor is divided into a pressing cavity and a negative pressure adjusting cavity through a partition plate, a compressed air cavity and a pressing device are arranged in the pressing cavity, two ends of the compressed air cavity are respectively connected with the partition plate and the pressing plate, a connecting pipe is arranged on the side wall of the negative pressure adjusting cavity, a baffle is arranged at the joint of the negative pressure adjusting cavity, an air chamber and a communicating hose are arranged in the negative pressure adjusting cavity, two ends of the air chamber are respectively communicated with a first air port arranged on the partition plate and a second air port arranged on the side wall of the negative pressure adjusting cavity, the second air port is sealed through a soft plug, two ends of the communicating hose are respectively communicated with a first communicating hole arranged on the partition plate and a second. The invention has the advantages of simple structure, low manufacturing cost, small volume, convenient use, large measuring range, high use efficiency and long service life.

Description

Manual pipettor

Technical Field

The invention belongs to the technical field of chemical analysis, and particularly relates to a manual liquid transfer device.

Background

In daily chemical analysis, pipetting and liquid separation operations using an aurilave are frequently required. When using aurilave to operate, need both hands to cooperate the pipette to operate, carelessly a little, just need readjust aurilave and absorb once more, lead to wasting time in the use, hard, influence the operating efficiency who analyzes the flow.

The existing pipettors on the market at present, which can replace the aurilave, are divided into two types:

one is a piston-type pipette (pipette gun) mainly for quantitatively pipetting a sample solution. The liquid transfer device has the advantages of complex structure and high manufacturing cost, and meanwhile, the range is small due to the volume limitation of the piston air cavity, and the liquid transfer device is relatively complex to clean and maintain after being used. The piston type pipettor is commonly used in the fields of medicine and biochemistry, is only suitable for carrying out experimental operation on trace accurate pipetting solution, and is not suitable for pipetting and liquid separating operation with larger capacity in chemical analysis.

One is a manual pipette which still uses the resilience force of the balloon as power and is matched with the pipette for operation. The pipette is generally large in size, and the other hand is still needed to extrude the balloon before liquid suction, so that the operation is inconvenient. Because the gasbag is mostly the rubber material, the resilience force is not good, also ages easily in chemical environment, and its life receives the influence.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a manual pipette which is small in size, convenient to operate, large in measuring range and long in service life.

The technical scheme adopted by the invention for solving the technical problems is as follows: a manual liquid transfer device is characterized by comprising a shell, wherein the inner cavity of the shell is divided into a pressing cavity and a negative pressure adjusting cavity by a partition plate, a compressed air cavity and a pressing device are arranged in the pressing cavity, two ends of the compressed air cavity are respectively connected with the partition board and the pressing plate, the pressing device drives the compressed air cavity to stretch, the side wall of the negative pressure adjusting cavity is provided with a connecting pipe, a baffle is arranged at the joint of the connecting pipe and the negative pressure adjusting cavity, an air chamber and a communicating hose are arranged in the negative pressure adjusting cavity, two ends of the air chamber are respectively communicated with a first air port arranged on the clapboard and a second air port on the side wall of the negative pressure adjusting cavity, the second air port is sealed by a soft plug, two ends of the communicating hose are respectively communicated with the first communicating hole in the partition plate and the second communicating hole in the baffle plate, a negative pressure adjusting device is arranged in the negative pressure adjusting cavity, and the negative pressure adjusting device is configured with the communicating hose.

According to the above scheme, negative pressure adjusting device is including being fixed in rectangle regulating box on the negative pressure regulation intracavity wall, the bottom plate thickness of regulating box increases progressively along the axial, in the regulating box was worn to locate by the intercommunication hose, the pipe wall linked to each other with the bottom plate, is equipped with the bar opening on the regulating box roof, and the symmetry is equipped with the spout on the both sides wall of regulating box, and both sides spout disposes with the pivot both ends respectively, the pivot centre bore cover is equipped with the knob carousel, knob carousel top is followed stretch out in the bar opening, is equipped with straight notch with the corresponding position of bar opening on the negative pressure regulation chamber lateral wall.

According to the scheme, the pressing device comprises a plurality of connecting rods and a plurality of springs, the connecting rods are arranged along the circumferential direction of the compressed air cavity at uniform intervals, the inner side ends of the connecting rods are fixed on the partition plate, the springs are respectively sleeved on the connecting rods, the inner side ends of the springs are fixed on the partition plate, and the outer side ends of the springs are connected with the inner wall of the pressing plate.

According to the scheme, the inner wall of the connecting pipe is provided with a layer of soft silica gel pad along the circumferential direction.

The invention has the beneficial effects that: 1. the manual pipettor has no piston type air cavity for other pipettors, or rubber ball bag for sucking power, and brand new design of driving silica gel compressed air cavity by means of spring resilience. The volume of the liquid transfer device is larger, the solution is sucked more quickly and efficiently, and the range is larger; 2. the design is a single-hand operation mode, the modeling structure meets the requirement of human engineering, the use is more comfortable and convenient, and the working efficiency can be effectively improved; 3. the connecting pipe is arranged, the inner silica gel pad has elasticity so as to adapt to the wall of the pipette, and simultaneously, the sealing effect is achieved, the connecting pipe can be matched with pipettes with different capacities and specifications for operation, the application range is wide, the connecting pipe is more corrosion-resistant, and the service life is longer; 4. the negative pressure adjusting device capable of adjusting the flow and the flow speed is arranged, so that the liquid suction and discharge speeds can be effectively controlled; 5. the structure is simple and efficient, the size is small, the manufacture is easy, and the manufacturing cost is low.

Drawings

FIG. 1 is a front view of one embodiment of the present invention.

FIG. 2 is a top view of one embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a negative pressure regulating device according to an embodiment of the present invention.

Detailed Description

For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.

As shown in fig. 1-2, a manual pipette comprises a housing 1, an inner cavity of the housing is divided into a pressing cavity and a negative pressure adjusting cavity by a partition plate 2, a compressed air cavity 3 and a pressing device are arranged in the pressing cavity, two ends of the compressed air cavity are respectively connected with the partition plate and the pressing plate 4, the pressing device drives the compressed air cavity to stretch, a connecting pipe 5 is arranged on a side wall of the negative pressure adjusting cavity, a baffle 6 is arranged at a joint of the connecting pipe and the negative pressure adjusting cavity, an air chamber 7 and a communicating hose 8 are arranged in the negative pressure adjusting cavity, two ends of the air chamber are respectively communicated with a first air port arranged on the partition plate and a second air port on a side wall of the negative pressure adjusting cavity, the second air port is sealed by a soft plug 9, two ends of the communicating hose are respectively communicated with a first communicating hole on the partition plate and a second communicating.

As shown in fig. 3, the negative pressure adjusting device includes a rectangular adjusting box 10 fixed on the inner wall of the negative pressure adjusting cavity, the thickness of the bottom plate increases progressively along the axial direction, the communicating hose penetrates through the adjusting box, the pipe wall is connected with the bottom plate, a strip-shaped opening is arranged on the top plate of the adjusting box, sliding grooves 11 are symmetrically arranged on the two side walls of the adjusting box, the sliding grooves on the two sides are respectively configured with the two ends of a rotating shaft 12, a knob rotating disk 13 is sleeved on the center of the rotating shaft, the top of the knob rotating disk extends out of the strip-shaped opening, a straight notch 14 is arranged at the position, corresponding to the strip-shaped opening, on the side wall of the negative pressure adjusting cavity, the straight notch extends out of the top of the knob rotating disk, an operator can stir the.

Pressing device includes several connecting rods 15 and several spring 16, and several connecting rods set up along the even interval of compressed air chamber circumference, and on the medial extremity was fixed in the baffle, several spring overlapped respectively and located several connecting rods, and on the medial extremity of spring was fixed in the baffle, the lateral extremity linked to each other with the inner wall according to the clamp plate, and operating personnel pressed down and drives spring and compressed air chamber shrink according to the clamp plate.

The inner wall of connecting pipe is equipped with one deck soft silica gel pad 17 along circumference, has elasticity, can cooperate the pipette of different volumes, different systems, guarantees the leakproofness.

The working process of the manual pipettor is as follows: when liquid needs to be extracted, a needed pipette is firstly installed in a connecting pipe, a soft plug is opened, a knob turntable is stirred to enable the through-flow sectional area of a communicating hose to be maximum, a pressing plate is pressed downwards to push a compressed air cavity to contract, air in the compressed air cavity is discharged, the soft plug is plugged, the pressing plate is loosened, the compressed air cavity enables the interior to form negative pressure under the action of the resilience force of a spring, therefore, the pipette sucks liquid, when the liquid reaches and exceeds the scale mark of the pipette, the knob turntable is stirred to enable the communicating hose to be closed, the soft plug is opened, the compressed air cavity is extended and reset by introducing air, then, the knob turntable is stirred to adjust the liquid outlet speed, redundant liquid is discharged until the liquid in the pipette accurately reaches the scale mark, the knob turntable is stirred to enable the communicating hose to be closed, the pipette is transferred to a needed, discharging the liquid to finish. The above operations can be completed by one hand.

Claims

1. A manual liquid transfer device is characterized by comprising a shell, wherein the inner cavity of the shell is divided into a pressing cavity and a negative pressure adjusting cavity by a partition plate, a compressed air cavity and a pressing device are arranged in the pressing cavity, two ends of the compressed air cavity are respectively connected with the partition board and the pressing plate, the pressing device drives the compressed air cavity to stretch, the side wall of the negative pressure adjusting cavity is provided with a connecting pipe, a baffle is arranged at the joint of the connecting pipe and the negative pressure adjusting cavity, an air chamber and a communicating hose are arranged in the negative pressure adjusting cavity, two ends of the air chamber are respectively communicated with a first air port arranged on the clapboard and a second air port on the side wall of the negative pressure adjusting cavity, the second air port is sealed by a soft plug, two ends of the communicating hose are respectively communicated with the first communicating hole on the partition plate and the second communicating hole on the baffle plate, a negative pressure adjusting device is arranged in the negative pressure adjusting cavity, and the negative pressure adjusting device is configured with the communicating hose; the negative pressure adjusting device comprises a rectangular adjusting box fixed on the inner wall of the negative pressure adjusting cavity, the thickness of a bottom plate of the adjusting box is increased in an axial direction, the communicating hose penetrates through the adjusting box, the pipe wall is connected with the bottom plate, a strip-shaped opening is formed in a top plate of the adjusting box, sliding grooves are symmetrically formed in two side walls of the adjusting box and are respectively configured with two ends of a rotating shaft, a knob turntable is sleeved at the center of the rotating shaft, the top of the knob turntable extends out of the strip-shaped opening, and a straight notch is formed in the side wall of the negative pressure adjusting cavity and corresponds to the strip-; the pressing device comprises a plurality of connecting rods and a plurality of springs, the connecting rods are arranged along the circumferential direction of the compressed air cavity at uniform intervals, the inner side ends of the connecting rods are fixed on the partition plate, the springs are respectively sleeved on the connecting rods, the inner side ends of the springs are fixed on the partition plate, and the outer side ends of the springs are connected with the inner wall of the pressing plate.

2. The manual pipette according to claim 1, wherein a layer of soft silicone rubber pad is circumferentially disposed on an inner wall of the connection tube.