CN221230605U

CN221230605U - Multi-range pipette

Info

Publication number: CN221230605U
Application number: CN202323192230.6U
Authority: CN
Inventors: 潘泽昊; 章义键; 蒋峰
Original assignee: Jiangsu Cancer Prevention Research Institute (jiangsu Cancer Hospital)
Current assignee: Jiangsu Cancer Prevention Research Institute (jiangsu Cancer Hospital)
Filing date: 2023-11-24
Publication date: 2024-06-28
Anticipated expiration: 2033-11-24

Abstract

The utility model discloses a multiscale pipettor in laboratory instrument field, including shell, handle and pipette, handle fixed connection is in the shell lower wall, shell and handle intercommunication, the one end rotation of keeping away from the handle of shell is connected with conversion mechanism, the outside of conversion mechanism can be dismantled and is connected with four different liquid sucking and discharging pipes, the intercommunication has exhaust mechanism between shell and the conversion mechanism, exhaust mechanism runs through shell and conversion mechanism to with the inside intercommunication of liquid sucking and discharging pipe, one side that the handle is close to conversion mechanism is equipped with imbibition button and flowing back button, the inside controller that is equipped with of handle, the inside two pressure switch that are equipped with of controller, imbibition button and flowing back button are connected with two pressure switch of controller respectively, the controller passes through the electrical signal and is connected with exhaust mechanism. The liquid suction and discharge pipe with a plurality of measuring ranges is provided for the liquid suction and discharge pipe, so that most of liquid suction needs are met, the liquid suction precision is improved, and the liquid suction and discharge pipe is simple and convenient only by being converted into the required measuring range during use.

Description

Multi-range pipette

Technical Field

The utility model belongs to the field of laboratory instruments, and particularly relates to a multi-range pipette.

Background

Pipetting devices are commonly used for pipetting small or minute amounts of liquid in laboratories, and belong to precision instruments, with electric and manual pipetting guns. Compared with a manual pipette, the electric pipette has higher efficiency and wider use range, thereby being widely applied to various experiments. The existing electric pipetting gun generally adopts a motor to drive a piston to move up and down and adopts the pipeline of a reversing valve to switch so as to adjust the air pressure in an air passage, thereby realizing continuous suction and pushing of liquid. When the electric pipetting gun continuously sucks liquid, the motor drives the piston to move up and down, and simultaneously, the negative pressure is always formed in the air passage through the pipeline switching of the reversing valve, so that the continuous suction of the liquid is realized; when the electric pipette continuously blows out liquid, the motor drives the piston to move up and down, and meanwhile, the pipeline of the reversing valve is switched, so that positive pressure is always formed in the air passage, and continuous blowing out of the liquid is realized.

The publication CN 214636507U discloses a dual mode electric pipette comprising a pistol-shaped housing with a hollow cavity in the upper part and a hollow handle in the lower part; the cavity is sequentially divided into an element cavity, a sealing cavity and a liquid inlet and outlet cavity, a motor is arranged in the element cavity, a piston is arranged in the sealing cavity, and the piston is connected with the motor; the handle is internally provided with a battery and a control which are connected, the control is also connected with a motor, a liquid suction control key and a liquid discharge control key, and one ends of the liquid suction control key and the liquid discharge control key extend to the outside of the handle; the shell is provided with a control area and a display area. However, the volume of the liquid inlet and outlet chamber of the device is fixed, and the air which can be sucked when the piston moves is fixed, so that the volume when liquid is sucked is also fixed, and when the measuring range of the solution to be sucked is larger than the volume of the gas which can be sucked of the liquid inlet and outlet chamber, the larger liquid-moving device needs to be replaced; if the solution to be sucked is too small in volume than the gas to be sucked in and out of the liquid chamber, the accuracy of the pipette is lowered.

Disclosure of utility model

The utility model aims to provide a multi-range pipette, which aims to solve the problem of inaccurate precision caused by single range of the pipette.

The utility model provides a multiscale pipettor in this scheme, includes shell, handle and pipette, handle fixed connection is in the shell lower wall, shell and handle intercommunication, the one end of keeping away from the handle of shell rotates and is connected with conversion mechanism, and conversion mechanism's outside can be dismantled and is connected with four different liquid sucking and discharging pipes, the intercommunication has exhaust mechanism between shell and the conversion mechanism, exhaust mechanism runs through shell and conversion mechanism to with the inside intercommunication of liquid sucking and discharging pipe, one side that the handle is close to conversion mechanism is equipped with imbibition button and flowing back button, the inside controller that is equipped with of handle, the inside two pressure switch that are equipped with of controller, imbibition button and flowing back button are connected with two pressure switch of controller respectively, and the controller passes through the electrical signal and is connected with exhaust mechanism.

The working principle of the scheme and the beneficial effects thereof are that: when the pipette is used, the conversion mechanism is driven to rotate to a state that the liquid sucking and discharging pipe, the conversion mechanism and the air discharging hole of the air discharging mechanism are communicated, the pipette is arranged at the free end of the liquid sucking and discharging pipe, then the liquid discharging key is pressed, the pressure switch is pressed by the liquid discharging key, the pressure value is transmitted to the controller by the pressure switch, the controller controls the air discharging mechanism to move downwards, air in the pipette is discharged, then the pipette is vertically placed into liquid to be moved, the liquid sucking key is pressed, the pressure switch is pressed by the liquid sucking key, the pressure value is transmitted to the controller, and accordingly the air discharging mechanism is controlled to move upwards by the controller, and the liquid is sucked; when the liquid to be sucked exceeds the measuring range of the liquid sucking and discharging pipe, the conversion mechanism can be rotated to enable the longer liquid sucking and discharging pipe to be aligned with the upper exhaust mechanism, so that the liquid with larger volume can be sucked.

Further, exhaust mechanism includes exhaust chamber and draw runner, exhaust chamber vertical fixation is equipped with conversion mechanism's one end in the shell, draw runner fixedly connected with in the top in exhaust chamber, draw runner sliding connection has the rack, the lower extreme fixedly connected with piston of rack, the equal sliding connection of piston and exhaust chamber, conversion mechanism and liquid suction and discharge tube, the position meshing that the rack is close to the lower extreme has the gear, and gear fixedly connected with drives its pivoted motor, pass through electric signal connection between motor and the controller.

When the device is used, the liquid suction key or the liquid discharge key is pressed, the pressure switch transmits the pressure value to the controller, and the controller controls the motor to rotate forwards or reversely, so that the gear is controlled to drive the rack to move up and down, and the liquid suction or liquid discharge operation is completed.

Further, the conversion mechanism comprises a conversion chamber and a ratchet wheel, the ratchet wheel is fixedly connected with the shell, a through hole is obliquely formed in the position, close to the periphery, of the ratchet wheel, the through hole is coaxially communicated with an exhaust cavity above the ratchet wheel, the conversion chamber is sleeved outside the ratchet wheel and is rotationally connected with the shell, a barrier strip is fixedly connected with the side wall of the conversion chamber, a spring is arranged in the barrier strip, one end of the barrier strip is in contact with the side wall of the ratchet wheel, and the four liquid sucking and discharging pipes are detachably connected in the conversion chamber. When the device is used, if the liquid suction and discharge pipe is required to be replaced, the conversion chamber is only required to be rotated to drive the barrier strip to rotate, one end of the barrier strip is contacted with the teeth on the ratchet wheel, the spring drives the barrier strip to stretch and retract during rotation, and the spring is clamped in the teeth of the ratchet wheel after rotation in place to play a role in positioning.

Further, the inside of shell is detachably connected with the battery, and the top of battery is equipped with the battery cover, the battery cover can be dismantled and be connected in the top of shell, the controller is connected with the battery electricity. The whole liquid transfer device is provided with kinetic energy through the battery, so that the liquid transfer device is convenient and concise, and the use of the liquid transfer device is also convenient due to the replacement of the battery.

Further, one end of the shell, which is close to the handle, is provided with a control panel. The control panel can control the running speed of the motor to adjust the speed of liquid suction and liquid discharge.

Further, the free ends of the four liquid sucking and discharging pipes are fixedly connected with rubber fixing sleeves. The rubber fixing sleeve is used for fixing the pipette, so that the pipette is prevented from sliding downwards or is not completely sealed.

Further, the upper end of the rubber fixing sleeve is provided with a baffle, and the baffle is fixedly connected with the inside of the liquid suction and discharge pipe. The baffle prevents the upper piston from moving down too far and impinging on the pipette.

Further, sealing rings are arranged on two sides of the through hole of the ratchet wheel, the sealing rings are fixedly connected to the ratchet wheel, and the sealing rings extend to two ends of the conversion chamber towards two sides and are connected with the two ends of the conversion chamber. The sealing ring enables the space of the whole piston to be in a sealing state, and the condition of inaccurate measuring range caused by air leakage of the piston is avoided.

Drawings

FIG. 1 is a schematic diagram of a multi-range pipette according to the present utility model;

FIG. 2 is a front cross-sectional view of FIG. 1;

FIG. 3 is a top view of the transfer chamber of FIG. 1;

fig. 4 is a schematic structural diagram of the control panel in fig. 1.

Detailed Description

The following is a further detailed description of the embodiments:

Reference numerals in the drawings of the specification include: rubber fixed sleeve 1, inhale the fluid-discharge tube 2, transfer room 3, ratchet 4, exhaust chamber 5, draw runner 6, rack 7, gear 8, piston 9, baffle 10, pipette 11, battery cover 12, battery 13, shell 14, control panel 15, controller 16, imbibition button 17, flowing back button 18, handle 19, sealing ring 20, blend stop 21.

The embodiment is basically as shown in fig. 1-4: the utility model provides a multirange pipette, includes pipette 11, shell 14 and handle 19, and shell 14 and handle 19 are fixed connection and are inside intercommunication in the lower wall of shell 14, and handle 19 is located the position that shell 14 is close to the rear end, and the one end that shell 14 kept away from handle 19 rotates and is connected with conversion mechanism;

The conversion mechanism comprises a conversion chamber 3 and a ratchet wheel 4, the ratchet wheel 4 is fixedly connected to a shell 14, the conversion chamber 3 is rotationally connected with the shell 14, the conversion chamber 3 is sleeved outside the ratchet wheel 4, one side of the inside of the conversion chamber 3 is fixedly connected with a baffle bar 21, a spring is arranged inside the baffle bar 21, one end of the baffle bar 21 is connected with the side wall of the ratchet wheel 4, four liquid sucking and discharging pipes 2 with different lengths are connected outside the conversion chamber 3 through threads, the measuring ranges of the four liquid sucking and discharging pipes 2 are respectively 2.5 ul-10 ul, 10ul-100ul, 100ul-1000ul and 1ml-5ml, the positions, close to the end parts, of the inner walls of the liquid sucking and discharging pipes 2 are fixedly connected with a rubber fixing sleeve 1, the rubber fixing sleeve 1 is detachably connected with a pipette 11, an annular baffle plate 10 is arranged at the upper end of the rubber fixing sleeve 1, through holes are formed in the positions, which are in contact with the four liquid sucking and discharging pipes 2, through holes are formed in one side, close to a handle 19, of the ratchet wheel 4, sealing rings 20 and 20 are respectively arranged on two sides of the through holes of the ratchet wheel 4, the sealing rings are fixedly connected to the two sides of the ratchet wheel 4, and the sealing rings 20 are respectively connected to the two sides of the ratchet wheel 4, and the two sealing rings can be coaxially connected with the conversion chamber 3 and the liquid sucking and discharging pipe 3, and the conversion chamber 3, and the sealing rings can be connected to the two through the sealing rings, and the sealing rings;

The inside of the shell 14 is provided with an exhaust mechanism, the exhaust mechanism is positioned above the conversion mechanism, the exhaust mechanism comprises an exhaust cavity 5 and a slide bar 6, the exhaust cavity 5 penetrates through the shell 14 and is communicated with the through holes of the conversion chamber 3 and the ratchet wheel 4 below, the top of the exhaust cavity 5 is fixedly connected with the slide bar 6, the slide bar 6 is slidably connected with a rack 7, the rack 7 is meshed with a gear 8, the gear 8 is fixedly connected with a motor, the motor 8 is fixedly connected with the shell 14, the lower end of the rack 7 is fixedly connected with a piston 9, and the piston 9 is slidably connected with the exhaust cavity 5, the shell 14, the ratchet wheel 4 and the liquid suction and discharge pipe 2;

The battery 13 is detachably connected to the inside of the shell 14, the battery cover 12 is arranged above the battery 13, the battery cover 12 is detachably connected with the shell 14, the shell 14 is fixedly connected with the control panel 15 relative to one end of the conversion mechanism, four keys are arranged on the control panel 15 and used for respectively controlling the speed during liquid suction and liquid discharge, and pressure switches are arranged below the four keys and are connected with the controller 16 through electric signals;

The inside fixedly connected with controller 16 (PCL controller etc.) of handle 19, handle 19 is close to conversion room 3 degrees one side and is equipped with imbibition button 17 and flowing back button 18, imbibition button 17 and flowing back button 18 all run through handle 19 and with handle 19 sliding connection, imbibition button 17 and the one end that flowing back button 18 is located handle 19 inside all fixedly connected with pressure switch, pressure switch passes through electric signal connection with controller 16, controller 16 is connected with battery 13 electricity, control panel 15 and motor 8 all are connected with controller 16 electricity.

The specific implementation process is as follows: when the liquid suction and discharge device is used, the conversion chamber 3 is rotated, one end of the liquid suction and discharge tube 2 which is required to be used is adjusted to be coaxially communicated with the inside of the liquid suction and discharge tube 2, the conversion chamber 3, the ratchet wheel 4 and the exhaust cavity 5 above, the baffle bar 21 in the conversion chamber 3 is sprung down to be clamped in the groove of the ratchet wheel 4 after rotating in place to avoid rotation of the conversion chamber 3, then the pipette 11 is arranged in the rubber fixing sleeve 1 in the end part of the liquid suction and discharge tube 2 to be fixed, then the liquid discharge button 18 is pressed, the liquid discharge button 18 presses the pressure switch, the pressure switch transmits a pressure value to the controller 16, the controller 16 controls the gear 8 to drive the piston 7 to move, the gear 8 is controlled to rotate forwards, the gear 8 is driven to rotate forwards, the rack 7 meshed with the piston 9 moves downwards, the air in the air suction and discharge tube 2 is compressed, then the pipette 11 is vertically placed into liquid to be sucked, the liquid suction button 17 is pressed, the pressure switch is pressed, the pressure value is transmitted to the controller 16, the controller 16 controls the motor to rotate reversely, the gear 8 is controlled to drive the piston 7 to move the piston 9, the liquid suction and the liquid discharge tube 2 is directly sucked into the battery 13, and the liquid suction and the liquid discharge device 13 can be directly discharged through the battery 13, and the battery 13 can be directly and controlled to be directly and detached, and the speed 13 can be directly controlled.

The foregoing is merely exemplary embodiments of the present utility model, and specific structures and features that are well known in the art are not described in detail herein. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present utility model, and these should also be considered as the scope of the present utility model, which does not affect the effect of the implementation of the present utility model and the utility of the patent. The protection scope of the present utility model is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims

1. The utility model provides a multiscale pipettor, includes shell, handle and pipette, handle fixed connection is in the shell lower wall, shell and handle intercommunication, its characterized in that: the one end that keeps away from the handle of shell rotates and is connected with conversion mechanism, and the outside of conversion mechanism can be dismantled and is connected with four different length and inhale the fluid-discharge tube, the intercommunication has exhaust mechanism between shell and the conversion mechanism, exhaust mechanism runs through shell and conversion mechanism to with inhale the inside intercommunication of fluid-discharge tube, one side that the handle is close to conversion mechanism is equipped with imbibition button and flowing back button, the inside controller that is equipped with of handle, the inside two pressure switch that are equipped with of controller, imbibition button and flowing back button are connected with two pressure switch of controller respectively, and the controller passes through the electrical signal and is connected with exhaust mechanism.

2. A multirange pipette as defined in claim 1 wherein: the exhaust mechanism comprises an exhaust cavity and a slide bar, the exhaust cavity is vertically and fixedly connected with one end of the shell, which is provided with a conversion mechanism, the slide bar is fixedly connected with the top end of the exhaust cavity, the slide bar is slidably connected with a rack, the lower end of the rack is fixedly connected with a piston, the piston is slidably connected with the exhaust cavity, the conversion mechanism and the liquid suction and discharge pipe, the position, close to the lower end, of the rack is meshed with a gear, the gear is fixedly connected with a motor for driving the gear to rotate, and the motor is connected with a controller through an electric signal.

3. A multirange pipette as defined in claim 2 wherein: the switching mechanism comprises a switching chamber and a ratchet wheel, the ratchet wheel is fixedly connected with the shell, a through hole is obliquely formed in the position, close to the periphery, of the ratchet wheel, the through hole is coaxially communicated with an exhaust cavity above the ratchet wheel, the switching chamber is sleeved outside the ratchet wheel and is rotationally connected with the shell, a barrier strip is fixedly connected with the side wall of the switching chamber, a spring is arranged in the barrier strip, one end of the barrier strip is in contact with the side wall of the ratchet wheel, and the four liquid sucking and discharging pipes are detachably connected in the switching chamber.

4. A multirange pipette as defined in claim 3 wherein: the inside of shell is connected with the battery in a detachable way, and the top of battery is equipped with the battery cover, the battery cover can be connected in the top of shell in a detachable way, the controller is connected with the battery electricity.

5. The multi-range pipette of claim 4 wherein: one end of the shell, which is close to the handle, is provided with a control panel.

6. The multi-range pipette of claim 5 wherein: the free ends of the four liquid sucking and discharging pipes are fixedly connected with rubber fixing sleeves.

7. The multi-range pipette of claim 6 wherein: the upper end of the rubber fixing sleeve is provided with a baffle which is fixedly connected with the inside of the liquid sucking and discharging pipe.

8. The multi-range pipette of claim 7 wherein: sealing rings are arranged on two sides of the through hole of the ratchet wheel, the sealing rings are fixedly connected to the ratchet wheel, and extend to two ends of the conversion chamber towards two sides and are connected with the two ends of the conversion chamber.