CN112808341A - Plunger pump assembly capable of detecting liquid level - Google Patents
Plunger pump assembly capable of detecting liquid level Download PDFInfo
- Publication number
- CN112808341A CN112808341A CN202110214550.3A CN202110214550A CN112808341A CN 112808341 A CN112808341 A CN 112808341A CN 202110214550 A CN202110214550 A CN 202110214550A CN 112808341 A CN112808341 A CN 112808341A
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- Prior art keywords
- plunger
- pump head
- seat
- plunger tube
- liquid level
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- 239000007788 liquid Substances 0.000 title claims abstract description 34
- 238000012544 monitoring process Methods 0.000 claims abstract description 41
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims description 10
- 239000000523 sample Substances 0.000 claims description 5
- 239000012811 non-conductive material Substances 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 4
- 238000012806 monitoring device Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 17
- 238000012546 transfer Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009422 external insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002558 medical inspection Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Images
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
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- Health & Medical Sciences (AREA)
- Clinical Laboratory Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses a plunger pump assembly capable of detecting liquid level, which comprises a pump head seat, a plunger rod, a plunger tube, a pump head, a control circuit board and a pressure sensor, wherein the upper end of the pump head seat is hermetically connected with the plunger rod, the lower end of the pump head seat is hermetically connected with the plunger tube, and an internal cavity of the pump head seat is communicated with an inner hole of the plunger tube; the pump head is connected to the lower end of the plunger tube and used for mounting a conductive suction head; the pressure sensor is arranged on the control circuit board, and the detection end of the pressure sensor monitors the pressure change in the plunger tube; the control circuit board is provided with an air pressure monitoring circuit and a capacitance monitoring circuit, the air pressure monitoring circuit is electrically connected with the pressure sensor and receives pressure monitoring signals, and the capacitance monitoring circuit is communicated with the plunger tube and receives capacitance monitoring signals. The invention can integrate two monitoring devices of capacitance monitoring and air pressure monitoring, increase the reliability of liquid level detection, improve the accuracy of sample adding and save the dosage of samples or reagents.
Description
Technical Field
The invention relates to the technical field of medical liquid transfer, in particular to a plunger pump assembly capable of detecting liquid level.
Background
At present, the liquid transfer plunger pump is widely applied to medical inspection equipment, the liquid transfer plunger pump is used for sucking experimental liquid and transferring the experimental liquid into a designated container, and all operations are completely automatic. The pump head of the pipetting plunger pump is provided with tips (tips) for aspirating liquids. The existing methods for judging that the suction head reaches the position below the liquid level of liquid are divided into a resistance method, a pressure method and a capacitance method, the capacitance method is the most commonly used monitoring method at present, but the method still causes misjudgment due to different external environments, electromagnetic interference and other factors, leads to misliquid suction, and influences the detection result. No matter the monitoring mode of a resistance method, a pressure method or a capacitance method, the monitoring method is single, and monitoring data cannot be compared and verified, so that the monitoring accuracy is influenced.
Therefore, how to create a new plunger pump assembly capable of detecting liquid level belongs to one of the important research and development issues at present.
Disclosure of Invention
The invention aims to provide a plunger pump assembly capable of detecting liquid level, which integrates two monitoring devices of capacitance monitoring and air pressure monitoring into a whole, increases the reliability of liquid level detection, improves the sampling accuracy, and saves the dosage of samples or reagents, thereby overcoming the defects of the existing liquid level detection assembly.
In order to solve the above technical problem, the present invention provides a plunger pump assembly capable of detecting a liquid level, including a pump head seat, a plunger rod, a plunger tube, a pump head, a control circuit board and a pressure sensor, wherein:
the upper end of the pump head seat is hermetically connected with the plunger rod, the lower end of the pump head seat is hermetically connected with the plunger tube, and an internal cavity of the pump head seat is communicated with an inner hole of the plunger tube;
the pump head is connected to the lower end of the plunger tube and used for mounting a conductive suction head;
the pressure sensor is arranged on the control circuit board, and the detection end of the pressure sensor monitors the pressure change in the plunger tube;
the control circuit board is provided with an air pressure monitoring circuit and a capacitance monitoring circuit, the air pressure monitoring circuit is electrically connected with the pressure sensor and receives pressure monitoring signals, and the capacitance monitoring circuit is communicated with the plunger tube and receives capacitance monitoring signals.
As an improvement of the invention, a vertical through hole is arranged in the pump head base, the upper end of the through hole is connected with the plunger rod through a plunger sealing base, the lower end of the through hole is connected with the plunger pipe through a plunger pipe base, and the upper end and the lower end of the through hole are respectively sealed by the plunger sealing base and the plunger pipe base to form an internal cavity of the pump head base.
Furthermore, an air passage is arranged in the pump head seat, one end of the air passage is communicated with the inner cavity of the pump head seat, and the other end of the air passage is used for being inserted into a detection end of the pressure sensor.
Furthermore, an outlet at one end of the air passage communicated to the cavity in the pump head seat is positioned outside the upper edge of the plunger tube and is in sealed connection with the inner hole of the plunger tube.
Further, a capacitance detection point is arranged on the control circuit board and is communicated with the pump head through a conductive connecting piece.
Furthermore, a capacitance detection point is arranged on the control circuit board and connected to the plunger tube seat through a conductive connecting piece, and then the capacitance detection point is conducted with the pump head.
Furthermore, the pump head seat is made of non-conductive materials.
Furthermore, the plunger tube seat, the plunger tube and the pump head are made of conductive materials, and the plunger tube seat, the plunger tube and the pump head are in conductive connection.
Furthermore, the plunger pipe seat, the plunger pipe and the pump head are connected through welding.
After adopting such design, the invention has at least the following advantages:
1. the device integrating the capacitance monitoring method and the air pressure monitoring method is combined to detect the liquid level, the two methods are compared with each other, the possibility of misjudgment is reduced, the monitoring accuracy and reliability are improved, meanwhile, the device is more beneficial to accurately absorbing samples or reagents, and the using amount of the samples or reagents is saved.
2. The pressure sensor continuously monitors the pressure in the plunger pump, can timely find the phenomenon that the suction head is blocked by foreign matters and the phenomenon of air suction, timely responds, and can prevent liquid in the suction head from dripping through pressure compensation.
3. The plunger sealing seat, the pump head seat and the plunger pipe seat are connected in a sealing mode, and the air channel in the pump head seat is connected with the inner hole of the plunger pipe in a sealing mode, so that a sealing environment is formed between the inner hole of the plunger pipe and the pressure sensor, and the accuracy of air pressure monitoring is guaranteed.
4. The pump head seat is made of non-conductive materials, an external insulation environment is provided for capacitance monitoring, the capacitance detection point on the circuit board is communicated with the plunger pipe seat, the plunger pipe and the pump head, and surrounding parts are insulators, so that the accuracy of capacitance monitoring is guaranteed.
Drawings
The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description.
FIG. 1 is a front view of a plunger pump assembly with a detectable fluid level provided by the present invention.
FIG. 2 is a rear view of a plunger pump assembly of the type provided by the present invention in which fluid level can be detected.
Fig. 3 is a cross-sectional view of section B-B of fig. 1.
Fig. 4 is a cross-sectional view of section a-a in fig. 1.
Description of reference numerals: 1-a plunger rod; 2-plunger seal seat; 3-pump head base; 4-plunger tube seat; 5-plunger tube; 6-pump head; 7-a control circuit board; 8-a pressure sensor; 9-capacitive probe points; 10-a conductive connection; 11-gas path channel.
Detailed Description
Referring to fig. 1 to 4, the present invention provides a plunger pump assembly capable of detecting a liquid level, including a plunger rod 1, a plunger seal seat 2, a pump head seat 3, a plunger tube seat 4, a plunger tube 5, a pump head 6, a control circuit board 7 and a pressure sensor 8, wherein a vertical through hole is arranged in the pump head seat 3, the upper end of the through hole is hermetically connected with the plunger rod 1 through the plunger seal seat 2, and the lower end of the through hole is hermetically connected with the plunger tube 5 through the plunger tube seat 4, such that an inner hole of the plunger tube 5 is communicated with the interior of the pump head seat 3 to jointly form a sealed tube for taking and injecting liquid. An air passage channel 11 is arranged in the pump head seat 3, an outlet at one end of the air passage channel 11 is positioned outside the upper edge of the plunger tube 5 and is communicated with an inner hole of the plunger tube 5 through a sealing condition, and the other end of the air passage channel 11 leads to the outside of the pump head seat 3 and is used for inserting a detection end of the pressure sensor 8 into the air passage channel for monitoring. The pressure sensor 8 is installed on the control circuit board 7, the detection end of the pressure sensor 8 is inserted into the air channel 7, the air pressure change signal is transmitted to the control circuit board 7, the control circuit board 7 is provided with a pressure monitoring circuit, the pressure monitoring circuit receives the signal of the pressure sensor 8, and the plunger pump is correspondingly controlled.
The pump head 6 is connected to the end of the plunger tube 5 for mounting a conductive suction head. And a capacitance monitoring circuit is arranged on the control circuit board 7 and is used for monitoring the capacitance change of the pump head 6 so as to judge whether the pump head is in contact with the liquid level. Be equipped with electric capacity probe point 9 on control circuit board 7, electric capacity probe point 9 switches on through conductive connecting piece and plunger tube socket 4, simultaneously, all adopt conducting material to make between plunger tube socket 4, plunger tube 5 and the pump head 6, good electrically conductive connection between the three for electric capacity probe point 9 switches on with pump head 6. The material of pump head seat 3 is non-conductive material, only switches on with plunger tube socket 4, plunger pipe 5 and pump head 6 at electric capacity probing point 9 like this, and pump head seat 3 provides good insulating environment for it, more improves electric capacity monitoring's rate of accuracy.
Preferably, the plunger tube seat 4, the plunger tube 5 and the pump head 6 are connected by welding.
The plunger pump assembly capable of detecting the liquid level can judge the liquid level detection result by two monitoring methods, namely a capacitance method and a pneumatic method, so that the accuracy and the reliability of the monitoring result are improved. Meanwhile, the pressure sensor 8 can continuously monitor the pressure of the inner cavity of the pump head seat 3, when the pump head 6 is blocked by foreign matters or is sucked empty, the pressure sensor 8 sends out a pressure abnormal signal in time, and the control circuit board 7 responds in time. And when the pressure is lower than the preset value, the plunger pump is controlled to be pressurized in time, and the liquid in the suction head is prevented from dripping through pressure compensation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the above description of the present invention can be applied to various modifications, equivalent variations or modifications without departing from the spirit and scope of the present invention.
Claims (9)
1. The utility model provides a plunger pump subassembly of detectable liquid level which characterized in that includes pump head seat, plunger rod, plunger pipe, pump head, control circuit board and pressure sensor, wherein:
the upper end of the pump head seat is hermetically connected with the plunger rod, the lower end of the pump head seat is hermetically connected with the plunger tube, and an internal cavity of the pump head seat is communicated with an inner hole of the plunger tube;
the pump head is connected to the lower end of the plunger tube and used for mounting a conductive suction head;
the pressure sensor is arranged on the control circuit board, and the detection end of the pressure sensor monitors the pressure change in the plunger tube;
the control circuit board is provided with an air pressure monitoring circuit and a capacitance monitoring circuit, the air pressure monitoring circuit is electrically connected with the pressure sensor and receives pressure monitoring signals, and the capacitance monitoring circuit is communicated with the plunger tube and receives capacitance monitoring signals.
2. The plunger pump assembly capable of detecting the liquid level as claimed in claim 1, wherein a vertical through hole is formed in the pump head seat, the upper end of the through hole is connected with the plunger rod through the plunger sealing seat, the lower end of the through hole is connected with the plunger pipe through the plunger pipe seat, and the plunger sealing seat and the plunger pipe seat respectively seal the upper end and the lower end of the through hole to form a cavity in the pump head seat.
3. A plunger pump assembly capable of detecting liquid level as claimed in claim 1, wherein an air passage is provided inside the pump head seat, one end of the air passage is communicated with the internal cavity of the pump head seat, and the other end is used for inserting the detection end of the pressure sensor.
4. A plunger pump assembly capable of detecting liquid level as claimed in claim 3 wherein the outlet of the air passage channel connected to the inner cavity of the pump head seat is located outside the upper edge of the plunger tube and is connected with the inner hole of the plunger tube in a sealing way.
5. A plunger pump assembly as claimed in claim 1 wherein the control circuit board is provided with a capacitive probe which is electrically connected to the pump head by an electrically conductive connection.
6. A plunger pump assembly capable of detecting liquid level as claimed in claim 2 wherein the control circuit board is provided with a capacitive detection point, the capacitive detection point is connected to the plunger tube seat through a conductive connecting piece and is further communicated with the pump head.
7. A liquid level detectable plunger pump assembly as claimed in claim 1 wherein the head base is formed of a non-conductive material.
8. The plunger pump assembly capable of detecting liquid level as claimed in claim 2, wherein the plunger tube seat, the plunger tube and the pump head are made of conductive materials, and the plunger tube seat, the plunger tube and the pump head are electrically connected.
9. A liquid level detectable plunger pump assembly as claimed in claim 8 wherein said plunger tube base, plunger tube and pump head are connected by welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110214550.3A CN112808341A (en) | 2021-02-26 | 2021-02-26 | Plunger pump assembly capable of detecting liquid level |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110214550.3A CN112808341A (en) | 2021-02-26 | 2021-02-26 | Plunger pump assembly capable of detecting liquid level |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112808341A true CN112808341A (en) | 2021-05-18 |
Family
ID=75865671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110214550.3A Pending CN112808341A (en) | 2021-02-26 | 2021-02-26 | Plunger pump assembly capable of detecting liquid level |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112808341A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1669762A1 (en) * | 2004-12-10 | 2006-06-14 | Tecan Trading AG | Pipetting apparatus with integrated liquid level and/or gas bubble detection |
| US20080019878A1 (en) * | 2006-07-21 | 2008-01-24 | Stratec Biomedical Systems Ag | Positioning device for the positioning of pipettes |
| JP2009276185A (en) * | 2008-05-14 | 2009-11-26 | Toshiba Corp | Plunger pump, dispenser using it, inspection device of specimen and liquid mixing method |
| CN103557136A (en) * | 2013-10-21 | 2014-02-05 | 深圳市恒永达科技有限公司 | Liquid transfer pump, liquid transfer system and analysis device |
| GB201703098D0 (en) * | 2017-02-27 | 2017-04-12 | Stratec Biomedical Ag | Pipetting system |
| CN207740128U (en) * | 2017-12-22 | 2018-08-17 | 珠海丽珠试剂股份有限公司 | A kind of liquid relief pump |
| CN112211856A (en) * | 2020-10-30 | 2021-01-12 | 深圳市大肯科技有限公司 | Air pump |
| CN112857904A (en) * | 2021-02-26 | 2021-05-28 | 北京罗特思创科技有限公司 | Single-channel precision plunger pump with multiple liquid level detection modes |
| CN214408207U (en) * | 2021-02-26 | 2021-10-15 | 北京罗特思创科技有限公司 | Single-channel precision plunger pump with multiple liquid level detection modes |
| CN214636512U (en) * | 2021-02-26 | 2021-11-09 | 北京罗特思创科技有限公司 | Plunger pump assembly capable of detecting liquid level |
-
2021
- 2021-02-26 CN CN202110214550.3A patent/CN112808341A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1669762A1 (en) * | 2004-12-10 | 2006-06-14 | Tecan Trading AG | Pipetting apparatus with integrated liquid level and/or gas bubble detection |
| US20080019878A1 (en) * | 2006-07-21 | 2008-01-24 | Stratec Biomedical Systems Ag | Positioning device for the positioning of pipettes |
| JP2009276185A (en) * | 2008-05-14 | 2009-11-26 | Toshiba Corp | Plunger pump, dispenser using it, inspection device of specimen and liquid mixing method |
| CN103557136A (en) * | 2013-10-21 | 2014-02-05 | 深圳市恒永达科技有限公司 | Liquid transfer pump, liquid transfer system and analysis device |
| GB201703098D0 (en) * | 2017-02-27 | 2017-04-12 | Stratec Biomedical Ag | Pipetting system |
| CN207740128U (en) * | 2017-12-22 | 2018-08-17 | 珠海丽珠试剂股份有限公司 | A kind of liquid relief pump |
| CN112211856A (en) * | 2020-10-30 | 2021-01-12 | 深圳市大肯科技有限公司 | Air pump |
| CN112857904A (en) * | 2021-02-26 | 2021-05-28 | 北京罗特思创科技有限公司 | Single-channel precision plunger pump with multiple liquid level detection modes |
| CN214408207U (en) * | 2021-02-26 | 2021-10-15 | 北京罗特思创科技有限公司 | Single-channel precision plunger pump with multiple liquid level detection modes |
| CN214636512U (en) * | 2021-02-26 | 2021-11-09 | 北京罗特思创科技有限公司 | Plunger pump assembly capable of detecting liquid level |
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