CN110152751B - Electric pipette - Google Patents
Electric pipette Download PDFInfo
- Publication number
- CN110152751B CN110152751B CN201910439313.XA CN201910439313A CN110152751B CN 110152751 B CN110152751 B CN 110152751B CN 201910439313 A CN201910439313 A CN 201910439313A CN 110152751 B CN110152751 B CN 110152751B
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- China
- Prior art keywords
- direct current
- air passage
- key
- air
- shell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 238000005452 bending Methods 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 abstract description 36
- 230000009931 harmful effect Effects 0.000 abstract description 2
- 230000032683 aging Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- MFRCZYUUKMFJQJ-UHFFFAOYSA-N 1,4-dioxane-2,5-dione;1,3-dioxan-2-one Chemical group O=C1OCCCO1.O=C1COC(=O)CO1 MFRCZYUUKMFJQJ-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/02—Burettes; Pipettes
- B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
- B01L3/0217—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids of the plunger pump type
- B01L3/0227—Details of motor drive means
Landscapes
- Health & Medical Sciences (AREA)
- Clinical Laboratory Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Jet Pumps And Other Pumps (AREA)
- Automatic Analysis And Handling Materials Therefor (AREA)
Abstract
The invention discloses an electric pipette which comprises a shell, wherein an air passage is arranged in the shell; an impeller is arranged in the air passage, and a direct current motor for driving the impeller to rotate forwards or reversely is arranged in the shell; one end of the air passage is provided with an air vent, the other end of the air passage is provided with an air inlet, and the air inlet is provided with a two-way check valve. Due to the adoption of the technical scheme, compared with the existing piston and reversing valve pipette structure, the piston and reversing valve pipette structure is simpler in structure, and has low requirements on tightness, so that the piston and reversing valve pipette structure is higher in reliability and longer in service life. Through setting up waterproof sealing spare, can effectively avoid leading to liquid contact direct current motor because of the maloperation, if inhale liquid in the air flue because of misoperation, the accessible presses the second button, makes the liquid that gets into the air flue all discharge by the air inlet, can not cause harmful effect to the invention. By adopting the direct-current servo motor, stepless speed regulation of the electric pipetting gun is realized, and pipetting efficiency can be effectively improved.
Description
Technical Field
The invention relates to the field of laboratory instruments, in particular to an electric pipette.
Background
A pipette is one of pipettors, and is commonly used for transferring small or trace amounts of liquid in a laboratory, and belongs to a precise instrument. There are manual and electric pipette divisions in the working principle. Compared with a manual pipette, the electric pipette has higher efficiency, and thus, the electric pipette is widely applied to various tests.
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 blowout of liquid. When the electric pipetting gun continuously sucks liquid, the motor drives the piston to move up and down, and meanwhile, the pipeline of the reversing valve is switched, so that negative pressure is always formed in the air passage, air is sucked, and 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 positive pressure is always formed in the air passage through the pipeline switching of the reversing valve, and air is blown out, so that the continuous blowing out of the liquid is realized. The device has the following defects: 1. the reversing valve needs to be frequently reversed, so that the system becomes complex and is easy to fail; 2. the requirement for tightness is high, and the tightness is often lost due to the ageing of the air passage and the sealant, so that the sealing gasket cannot be used normally.
Disclosure of Invention
The invention provides an electric pipette, which solves the problem that the conventional electric pipette cannot be used normally due to the loss of tightness caused by the ageing of an air passage and sealant in the background art.
An electric pipette comprises a shell, wherein an air passage is arranged in the shell; an impeller is arranged in the air passage, and a direct current motor for driving the impeller to rotate forwards or reversely is arranged in the shell; one end of the air passage is provided with an air vent, the other end of the air passage is provided with an air inlet, and the air inlet is provided with a two-way check valve.
A pipette is first mounted on the air scoop (prior art). When liquid is required to be sucked, the direct current motor rotates positively and drives the impeller to enable air in the air passage to be discharged from the vent hole, negative pressure is formed in the air passage, and then the two-way check valve is opened inwards and liquid is sucked simultaneously. After the suction is completed, the direct current motor stops rotating, and the two ends of the two-way check valve have no air pressure difference, so that the two-way check valve is automatically closed, and the liquid stays in the pipette. When the liquid is required to be blown out, the direct current motor is reversed. Compared with the existing piston and reversing valve pipette structure, the invention has simpler structure and low requirement on tightness, thus having higher reliability and longer service life.
Preferably, a guide vane is further arranged in the air passage and fixedly connected with the inner wall of the air passage, and the guide vane is positioned at the front end of the impeller. Through setting up the stator at the impeller front end, can play the effect of dredging the air current, improve gas conveying efficiency, save the battery electric energy.
Preferably, the direct current motor is connected with the impeller through a motor shaft, a through hole for the motor shaft to pass through is formed in the air passage, and a waterproof sealing piece is arranged between the through hole and the motor shaft.
The liquid in the air passage system of the conventional liquid-transferring gun formed by the piston and the reversing valve is difficult to discharge, so that the liquid is prevented from being sucked into the air passage of the liquid-transferring gun and even into the air cylinder. According to the invention, the waterproof sealing piece is arranged between the through hole and the motor shaft, so that liquid can be effectively prevented from contacting the direct current motor due to misoperation, and if the liquid is sucked into the air passage due to misoperation, the liquid entering the air passage can be completely discharged from the air inlet by pressing the second key, so that adverse effects on the invention are avoided.
Preferably, the direct current motor is a direct current servo motor. Through adopting direct current servo motor, when signal voltage is zero, there is not the rotation phenomenon, avoids leading to the pipette to inhale unnecessary liquid because of the inertial rotation of impeller, has ensured the accuracy of pipette suction liquid volume.
Preferably, a controller is further arranged in the shell, and a first key and a second key are arranged on the shell; the controller is connected with the direct-current servo motor, the first key and the second key; the controller controls the direct current servo motor to rotate positively when the first key is pressed, and controls the direct current servo motor to rotate reversely when the second key is pressed.
Preferably, a first position sensor is arranged on the first key, and a second position sensor is arranged on the second key; the first position sensor and the second position sensor are connected with the controller; the deeper the first key/second key is pressed, the faster the controller controls the rotation speed of the direct current servo motor.
Preferably, the first position sensor/second position sensor converts the displacement signal into a voltage signal, and the controller controls the rotating speed of the direct current servo motor according to the magnitude of the voltage signal value, wherein the larger the voltage signal value is, the faster the rotating speed of the direct current servo motor is.
The steering and rotating speed of the direct current servo motor are regulated by using a displacement sensor in the prior art, and the invention does not make any improvement. The displacement sensor is used to complete the movement and the position of the direct current servo motor when the direct current servo motor drives the machinery to move (such as each shaft of the digital control device), the data output by the displacement sensor is fed back to the servo system main controller, and the system main controller sends an instruction to the direct current servo motor driver according to the position of each shaft to enable each shaft to move towards another target. The servo system master controller, the direct current servo motor driver, the direct current servo motor, the displacement sensor and the servo system master controller form a closed loop control system, and the system is called a closed loop servo system. Through the structure, the stepless speed regulation of the electric pipetting gun can be realized, so that pipetting efficiency can be effectively improved.
Preferably, the air passage is arranged transversely, and one end of the air passage is provided with a first bending part which bends upwards, and the first bending part is communicated with the vent hole on the shell; the other end of the air passage is provided with a second bending part which bends downwards, and the two-way check valve is arranged at the bottom of the second bending part.
Preferably, the air inlet is also provided with a suction nozzle.
Preferably, the direct current servo motor is maxon RE, 344515 and 12V.
Preferably, the first position sensor and the second position sensor are both linear position sensors, and the model is KTC1.
Preferably, the controller is a PLC or a singlechip.
Due to the adoption of the technical scheme, compared with the existing piston and reversing valve pipette structure, the piston and reversing valve pipette structure is simpler in structure, and has low requirements on tightness, so that the piston and reversing valve pipette structure is higher in reliability and longer in service life. Through setting up waterproof sealing spare between through-hole and motor shaft, can effectively avoid leading to liquid contact direct current motor because of the maloperation, if the liquid is inhaled in making the air flue because of misoperation, the accessible presses the second button for the liquid that gets into the air flue is all discharged by the air inlet, can not cause harmful effect to the invention. By adopting the direct-current servo motor, stepless speed regulation of the electric pipetting gun is realized, and pipetting efficiency is effectively improved.
Drawings
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
FIG. 4 is a schematic diagram of the structure of the transmission mechanism (impeller, guide vane, DC motor, motor shaft) of the present invention;
fig. 5 is a schematic structural view of the bi-directional check valve of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Referring to fig. 1-4, an electric pipette comprises a housing comprising a gun body 1 and a handle 2, wherein an air passage is transversely arranged in the gun body.
As shown in fig. 3, one end of the air passage is provided with a first bending part 111 which is bent upwards, and the first bending part 111 is communicated with a vent hole 112 at the top of the gun body 1; the other end of the air passage is provided with a second bending part 113 which bends downwards, the end part of the second bending part 113 is an air inlet, and a two-way check valve 114 and a suction nozzle 115 are sequentially arranged at the air inlet.
As shown in fig. 3, the handle 2 is provided with a dc servo motor 21, a controller 22, a battery 23, a first button 24 and a second button 25. An impeller 3 and a guide vane 4 are arranged in the air passage. The impeller 3 is connected with the direct current servo motor 21 through a motor shaft 211, and the guide vane 4 is fixedly arranged on the inner wall of the air passage and positioned at the front end of the impeller 3. The air passage is provided with a through hole for the motor shaft 211 to pass through, and a waterproof sealing piece 116 is arranged between the through hole and the motor shaft 211.
As shown in fig. 3, the battery 23 is connected to the controller 22, and the controller is connected to the first key 24, the second key 25, and the dc servomotor 21. A first position sensor (not shown) is arranged on the right side of the first key 24, and a second position sensor (not shown) is arranged on the right side of the second key 25; the first position sensor/the second position sensor converts the displacement signal into a voltage signal, and sends the voltage signal to the controller 22, the controller 22 controls the rotation speed of the direct current servo motor 21 according to the magnitude of the voltage signal value, and the rotation speed of the direct current servo motor 21 is faster as the voltage signal value is larger, so that stepless adjustment of the liquid suction or discharge rate of the pipette gun can be realized.
In operation, a pipette (prior art, not shown) is first mounted on the suction nozzle 115. When the liquid is required to be sucked, the first button 24 is pressed, the direct-current servo motor 21 starts to rotate forward, and torque is transmitted to the impeller 3 through the motor shaft 211. The impeller 3 rotates to discharge air in the air passage to the atmosphere through the air vent 112 and generate negative pressure in the air passage, which causes the two-way check valve 114 to open toward the inside of the air passage, so that air in the suction nozzle 115 is also sucked out, generating negative pressure, so that liquid can be sucked. By adjusting the depth to which the first key 24 is pressed, the rotation speed of the dc servomotor 21 can be controlled, thereby controlling the liquid suction speed. In the initial stage, the first key 24 can be pressed to the deepest position to suck the liquid at the fastest speed; when the volume of the sucked liquid reaches a set value quickly, the first key 24 is slightly released, so that the set sucked volume can be reached through slow suction; when the set volume is reached, the first button 24 is completely released, the direct current servo motor 21 immediately stops running, and at the moment, the two ends of the two-way check valve 114 are no longer provided with pressure differences, so that the two-way check valve is automatically closed, and at the moment, the air pressure in the suction nozzle 1 is stable, so that the liquid stays in the pipette.
When it is necessary to blow out the liquid, the first button 24 is released, the second button 25 is pressed, the dc servomotor 21 starts to reverse, and torque is transmitted to the impeller 3 through the motor shaft 211. The impeller 3 rotates, drawing air from the atmosphere through the vent 112 and creating a positive pressure throughout the airway that causes the bi-directional check valve 114 to open out of the airway, and the suction nozzle 115 into the air creating a positive pressure that can blow out the liquid. The rotation speed of the dc servo motor 21 and thus the liquid blowing speed can be controlled by the depth to which the second key 25 is pressed. In the initial stage, the second key 25 can be pressed lightly to blow out the liquid slowly; when the liquid is stably blown out, the second key 25 is fully pressed down again, so that all the liquid can be quickly blown out; after the operation is finished, the second key 25 is released, the direct current servo motor 21 immediately stops running, and at the moment, the two ends of the two-way check valve 114 are not provided with pressure differences any more, so that the two-way check valve is automatically closed.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. An electronic pipette includes the shell, be equipped with the air flue in the shell, its characterized in that: an impeller is arranged in the air passage, and a direct current motor for driving the impeller to rotate forwards or reversely is arranged in the shell; one end of the air passage is provided with a vent hole, the other end of the air passage is provided with an air inlet, and the air inlet is provided with a two-way check valve;
The air passage is transversely arranged, one end of the air passage is provided with a first bending part which is bent upwards, and the first bending part is communicated with the vent hole on the shell; the other end of the air passage is provided with a second bending part which bends downwards, and the two-way check valve is arranged at the bottom of the second bending part;
The direct current motor is connected with the impeller through a motor shaft, a through hole for the motor shaft to pass through is formed in the air passage, and a waterproof sealing piece is arranged between the through hole and the motor shaft.
2. The electric pipette of claim 1 wherein: the air flue is internally provided with a guide vane which is fixedly connected with the inner wall of the air flue and is positioned at the front end of the impeller.
3. The electric pipette according to claim 1 or 2, wherein: the direct current motor is a direct current servo motor.
4. The electric pipette of claim 3 wherein: a controller is further arranged in the shell, and a first key and a second key are arranged on the shell; the controller is connected with the direct-current servo motor, the first key and the second key; the controller controls the direct current servo motor to rotate positively when the first key is pressed, and controls the direct current servo motor to rotate reversely when the second key is pressed.
5. The electric pipette of claim 4 wherein: the first key is provided with a first position sensor, and the second key is provided with a second position sensor; the first position sensor and the second position sensor are connected with the controller; the deeper the first key/second key is pressed, the faster the controller controls the rotation speed of the direct current servo motor.
6. The electric pipette of claim 5 wherein: the first position sensor/the second position sensor converts the displacement signal into a voltage signal, and the controller controls the rotating speed of the direct current servo motor according to the magnitude of the voltage signal value, wherein the larger the voltage signal value is, the faster the rotating speed of the direct current servo motor is.
7. The electric pipette according to claim 1 or 2, wherein: and a suction nozzle is further arranged at the air inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910439313.XA CN110152751B (en) | 2019-05-24 | 2019-05-24 | Electric pipette |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910439313.XA CN110152751B (en) | 2019-05-24 | 2019-05-24 | Electric pipette |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110152751A CN110152751A (en) | 2019-08-23 |
| CN110152751B true CN110152751B (en) | 2024-05-17 |
Family
ID=67632513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910439313.XA Active CN110152751B (en) | 2019-05-24 | 2019-05-24 | Electric pipette |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110152751B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU23483A1 (en) * | 1929-03-11 | 1931-10-31 | П.П. Портянов | Shield with felt seals to the bearings of electrical machines |
| US3502919A (en) * | 1969-01-02 | 1970-03-24 | Borg Warner | Submersible motor seal section |
| US6253628B1 (en) * | 1998-08-21 | 2001-07-03 | Becton Dickinson And Company | Apparatus for drawing liquids into and expelling liquids from a pipet at variable flow rates |
| AU2003303692A1 (en) * | 2003-01-14 | 2004-08-10 | Pz Htl Spolka Akcyjna | Method of dispensing liquid in a pipetting device and the pipetting device |
| CN103623879A (en) * | 2013-12-16 | 2014-03-12 | 山东大学齐鲁医院 | Laser positioning type liquid transferring gun |
| CN204168040U (en) * | 2014-10-22 | 2015-02-18 | 上海特波电机有限公司 | Low-loss machine shaft seal |
| CN205298034U (en) * | 2015-12-15 | 2016-06-08 | 杭州天马时控科技有限公司 | Arrange water pump rotor seal structure |
| CN205304436U (en) * | 2015-12-28 | 2016-06-08 | 杭州天马时控科技有限公司 | Arrange water pump motor rotor |
| CN206712580U (en) * | 2017-05-10 | 2017-12-05 | 青岛晟润泰电气制造有限公司 | A kind of water-proof fan |
| CN210303723U (en) * | 2019-05-24 | 2020-04-14 | 南华大学 | Electric liquid-transfering gun |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK2633914T4 (en) * | 2012-03-02 | 2020-06-08 | Eppendorf Ag | Pipetting device and method of manufacture thereof |
| US20160279630A1 (en) * | 2015-03-29 | 2016-09-29 | Massachusetts Institute Of Technology | Methods and Apparatus for Pipetting |
-
2019
- 2019-05-24 CN CN201910439313.XA patent/CN110152751B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU23483A1 (en) * | 1929-03-11 | 1931-10-31 | П.П. Портянов | Shield with felt seals to the bearings of electrical machines |
| US3502919A (en) * | 1969-01-02 | 1970-03-24 | Borg Warner | Submersible motor seal section |
| US6253628B1 (en) * | 1998-08-21 | 2001-07-03 | Becton Dickinson And Company | Apparatus for drawing liquids into and expelling liquids from a pipet at variable flow rates |
| AU2003303692A1 (en) * | 2003-01-14 | 2004-08-10 | Pz Htl Spolka Akcyjna | Method of dispensing liquid in a pipetting device and the pipetting device |
| CN103623879A (en) * | 2013-12-16 | 2014-03-12 | 山东大学齐鲁医院 | Laser positioning type liquid transferring gun |
| CN204168040U (en) * | 2014-10-22 | 2015-02-18 | 上海特波电机有限公司 | Low-loss machine shaft seal |
| CN205298034U (en) * | 2015-12-15 | 2016-06-08 | 杭州天马时控科技有限公司 | Arrange water pump rotor seal structure |
| CN205304436U (en) * | 2015-12-28 | 2016-06-08 | 杭州天马时控科技有限公司 | Arrange water pump motor rotor |
| CN206712580U (en) * | 2017-05-10 | 2017-12-05 | 青岛晟润泰电气制造有限公司 | A kind of water-proof fan |
| CN210303723U (en) * | 2019-05-24 | 2020-04-14 | 南华大学 | Electric liquid-transfering gun |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110152751A (en) | 2019-08-23 |
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Inventor after: Gao Ling Inventor after: Gui Qingjun Inventor after: Yin Kai Inventor after: Li Ermao Inventor after: Chen Hainan Inventor after: Yin Linjie Inventor before: Gui Qingjun Inventor before: Gao Ling Inventor before: Yin Kai Inventor before: Li Ermao Inventor before: Chen Hainan Inventor before: Yin Linjie |
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