CN112058328A - Piston type liquid transferring gun capable of improving liquid transferring precision - Google Patents
Piston type liquid transferring gun capable of improving liquid transferring precision Download PDFInfo
- Publication number
- CN112058328A CN112058328A CN202010803195.9A CN202010803195A CN112058328A CN 112058328 A CN112058328 A CN 112058328A CN 202010803195 A CN202010803195 A CN 202010803195A CN 112058328 A CN112058328 A CN 112058328A
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- China
- Prior art keywords
- piston
- gun body
- groove
- ring
- gun
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- 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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- 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
- B01L3/0213—Accessories for glass pipettes; Gun-type pipettes, e.g. safety devices, pumps
-
- 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)
- Coating Apparatus (AREA)
Abstract
The invention relates to a piston type liquid-transfering gun for improving liquid-transfering precision, comprising a gun body, a piston sealing ring, a gun body sealing ring and a piston moving device, the gun body comprises a gun body, a vent groove, a top hole and a gun body groove, the piston comprises a piston ring, a piston groove and a piston rod, the vent groove is arranged in the gun body, the upper end hole of the vent groove is arranged at the upper part of the side wall of the gun body, the lower end hole is arranged at the lower part of the inner cavity of the side wall of the gun body, the top hole and the gun body groove are arranged on the top wall of the gun body, the gun body sealing ring is arranged in the gun body groove, the piston ring is arranged in the gun body inner cavity, the piston groove is arranged at the side part of the piston ring, the piston sealing ring is arranged in the piston groove, one end of the piston rod is connected with the piston ring, and the other end of the piston rod penetrates through the top hole to be connected with the piston moving device. The invention can improve the liquid transferring precision of the piston type liquid transferring gun in advance without improving the processing precision.
Description
Technical Field
The invention relates to the technical field of liquid filling, in particular to a piston type liquid-transfering gun for improving liquid-transfering precision.
Background
The pipette is one of the common instruments in biological, medical and chemical laboratories, and is commonly used for precise extraction of small or trace amounts of liquid in the laboratory. The piston type pipette has the working principle that the piston moves to generate negative pressure so that solution is sucked into the pipette head, and the piston type pipette for sucking trace liquid has very small volume, so that the diameter of an inner cavity of the pipette body of the pipette is designed to be very small, the sectional area is very small, the processing difficulty is high, in addition, in order to improve the precision of the pipette, the displacement precision of the piston movement is improved, the processing precision is greatly improved, and the manufacturing difficulty and the manufacturing cost are greatly increased.
Disclosure of Invention
In order to solve the problems, the invention provides a piston type pipette with improved pipetting precision, which can improve the pipetting precision of the piston type pipette without improving the processing precision, has larger inner cavity size under the condition of the same measuring range, and greatly reduces the processing difficulty and the cost.
The technical scheme adopted by the invention for solving the technical problems is as follows: comprises a gun body, a piston sealing ring, a gun body sealing ring and a piston moving device;
the gun body comprises a gun body, a vent groove, a top hole and a gun body groove;
the piston comprises a piston ring, a piston groove and a piston rod;
the vent groove is arranged in the gun body, an upper end hole of the vent groove is arranged at the upper part of the side wall of the gun body, and a lower end hole of the vent groove is arranged at the lower part of an inner cavity of the side wall of the gun body;
the top hole and the gun body groove are formed in the top wall of the gun body;
the gun body sealing ring is placed in the gun body groove;
the piston ring is in the gun body inner cavity;
the piston groove is arranged on the side part of the piston ring;
the piston sealing ring is placed in the piston groove;
one end of the piston rod is connected with the piston ring, and the other end of the piston rod penetrates through the top hole to be connected with the piston moving device.
Preferably, the gun body further comprises a limiting block, and the limiting block is arranged in the inner cavity of the side wall of the gun body and is arranged at the lower part of the upper end hole of the vent groove.
Preferably, at least one of the vent grooves is provided.
Preferably, the piston moving device may be a screw, a cylinder, a rack and pinion, a link mechanism, or the like, which generates linear motion.
Compared with the prior art, the invention has the following beneficial effects:
1. under the condition that the sizes of the inner cavities of the piston type pipette guns are the same, the pipetting precision of the piston type pipette guns can be effectively improved;
2. for the piston-type pipette with a small measuring range, the size of the inner cavity of the piston-type pipette can be made large, the processing difficulty and the cost can be effectively reduced, and the piston-type pipette is particularly suitable for absorbing trace solution.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The invention will now be described in detail with reference to fig. 1, wherein exemplary embodiments and descriptions of the invention are provided to explain the invention, but not to limit the invention.
Referring to fig. 1, a piston type liquid-transfering gun for improving liquid-transfering precision, including the gun body 1, piston 2, piston seal ring 3, gun body seal ring 4, piston mobile device 5, gun body 1 includes gun body 11, air channel 12, top hole 14, gun body recess 15, piston 2 includes piston ring 21, piston recess 22, piston rod 23, air channel 12 sets up in gun body 11, air channel 12 upper end hole is established on gun body 11 lateral wall upper portion, lower end hole is established in gun body 11 lateral wall inner chamber lower part, top hole 14 and gun body recess 15 are established at gun body 11 roof, gun body seal ring 4 places in gun body recess 15, piston ring 21 is at gun body 11 inner chamber, piston recess 22 is established at piston ring 21 lateral part, piston seal ring 3 places in piston recess 22, piston rod 23 one end links to each other with piston ring 21, the other end passes top hole 14 and links to each other with piston mobile device 5.
The gun body 1 further comprises a limiting block 13, wherein the limiting block 13 is arranged in an inner cavity of the side wall of the gun body 11, and is used for limiting the position of the piston ring 21 moving upwards at the lower part of the upper end hole of the vent groove 12 so as to avoid blocking the upper end hole of the vent groove 12.
The piston rod 23 and the top hole 14 are sealed by the gun body seal 4, and when the piston ring 21 moves upward, air above the piston ring 21 is discharged to the lower part of the side wall cavity of the gun body 11 through the vent groove 12.
The piston ring 21 and the inner cavity of the gun body 11 are sealed through a piston sealing ring 3.
The piston moving device 5 can adopt a driving mode of generating linear motion by a screw rod, an air cylinder, an oil cylinder, a gear rack, a connecting rod mechanism and the like, and the structural arrangement of the piston moving device is the prior art, and is not described in detail here.
When the piston type pipette sucks liquid, the piston moving device 5 drives the piston 2 to move upwards, air above the piston ring 21 is discharged to the lower part of an inner cavity of the side wall of the gun body 11 through the vent groove 12, when the piston 2 moves upwards, the lower part space of the piston ring 21 is increased, the upper part space of the piston ring 21 is reduced, because the area below the piston ring 21 is larger than the area above, the reduction amount of the upper part space, namely the amount of the air discharged from the upper part to the lower part through the vent groove 12 is smaller than the increase amount of the lower part space, a certain negative pressure can be generated in the inner cavity of the gun body 1 to suck the solution into the gun head, the difference value between the amount of the air discharged from the upper part to the lower part through the vent groove 12 and the increase amount of the lower part space is the volume of the sucked solution, and under the condition that the moving distance of the.
The accuracy of the piston-type pipette of the present invention and the prior art is compared as follows:
when the radius of the piston ring 21 is equal to the radius of the piston rod 23, the radius of the piston ring 21 is R1The radius of the piston rod 23 is R2The displacement error of the piston 2 is delta L, and the volume error of the piston type liquid-transfering gun in the prior art is delta V = pi R1 2Δ L, and the volumetric error of the piston-type pipette of the present invention is Δ V = tr1 2ΔL -π（R1 2 -R2 2）ΔL=πR2 2Δ L, so the ratio of the volume error of the present invention to that of the prior art is R2 2/ R1 2。
Since the difference between the amount of air discharged from the upper part to the lower part through the vent groove 12 and the increased amount of the lower space is the volume of the solution sucked, the size of the inner cavity of the present invention is the size of the inner cavity under the same rangeRadius R of piston ring 211Can be made larger, so R2And R1The ratio of the inner diameter to the outer diameter is smaller, so that the precision can be further improved, the processing difficulty and the cost of the larger inner cavity size are greatly reduced, and when R is smaller2/R1When the displacement error of the piston is not less than 0.1, the volume error of the solution sucked by the invention is 1% of the volume error of the prior art under the same piston displacement error, the influence of the piston displacement error on the solution sucking error can be greatly reduced, and the precision is greatly improved.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.
Claims (2)
1. The utility model provides an improve piston type liquid-transfering gun of liquid-transfering precision which characterized in that: comprises a gun body (1), a piston (2), a piston sealing ring (3), a gun body sealing ring (4) and a piston moving device (5);
the gun body (1) comprises a gun body (11), a vent groove (12), a top hole (14) and a gun body groove (15);
the piston (2) comprises a piston ring (21), a piston groove (22) and a piston rod (23);
the vent groove (12) is arranged in the gun body (11), an upper end hole of the vent groove (12) is arranged at the upper part of the side wall of the gun body (11), and a lower end hole is arranged at the lower part of the inner cavity of the side wall of the gun body (11);
the top hole (14) and the gun body groove (15) are arranged on the top wall of the gun body (11);
the gun body sealing ring (4) is placed in the gun body groove (15);
the piston ring (21) is arranged in the inner cavity of the gun body (11);
the piston groove (22) is arranged at the side part of the piston ring (21);
the piston sealing ring (3) is placed in the piston groove (22);
one end of the piston rod (23) is connected with the piston ring (21), and the other end of the piston rod passes through the top hole (14) and is connected with the piston moving device (5).
2. The piston-type pipette of claim 1, wherein: the gun body (1) further comprises a limiting block (13), wherein the limiting block (13) is arranged in an inner cavity of the side wall of the gun body (11) and is arranged at the lower part of an upper end hole of the vent groove (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010803195.9A CN112058328A (en) | 2020-08-11 | 2020-08-11 | Piston type liquid transferring gun capable of improving liquid transferring precision |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010803195.9A CN112058328A (en) | 2020-08-11 | 2020-08-11 | Piston type liquid transferring gun capable of improving liquid transferring precision |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112058328A true CN112058328A (en) | 2020-12-11 |
Family
ID=73661294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010803195.9A Withdrawn CN112058328A (en) | 2020-08-11 | 2020-08-11 | Piston type liquid transferring gun capable of improving liquid transferring precision |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112058328A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115463702A (en) * | 2022-09-20 | 2022-12-13 | 河南科技大学 | Sweet potato virus detection device and detection method |
| CN117244602A (en) * | 2023-09-28 | 2023-12-19 | 康容生物科技(太仓)有限公司 | Integrated external piston pipette suction head |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2536814Y (en) * | 2001-08-10 | 2003-02-19 | 中国科学院长春光学精密机械与物理研究所 | Automatic micro-injector |
| US20040231437A1 (en) * | 2003-05-22 | 2004-11-25 | H. Schwartz | Dual resolution syringe |
| CN201271411Y (en) * | 2008-09-08 | 2009-07-15 | 广州麦高医疗器械有限公司 | High precision syringe or syringe pump |
| CN202478263U (en) * | 2012-02-27 | 2012-10-10 | 延边大学 | Device for extracting, separating and injecting serum from blood |
-
2020
- 2020-08-11 CN CN202010803195.9A patent/CN112058328A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2536814Y (en) * | 2001-08-10 | 2003-02-19 | 中国科学院长春光学精密机械与物理研究所 | Automatic micro-injector |
| US20040231437A1 (en) * | 2003-05-22 | 2004-11-25 | H. Schwartz | Dual resolution syringe |
| CN201271411Y (en) * | 2008-09-08 | 2009-07-15 | 广州麦高医疗器械有限公司 | High precision syringe or syringe pump |
| CN202478263U (en) * | 2012-02-27 | 2012-10-10 | 延边大学 | Device for extracting, separating and injecting serum from blood |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115463702A (en) * | 2022-09-20 | 2022-12-13 | 河南科技大学 | Sweet potato virus detection device and detection method |
| CN115463702B (en) * | 2022-09-20 | 2023-11-14 | 河南科技大学 | Sweet potato virus detection device and detection method |
| CN117244602A (en) * | 2023-09-28 | 2023-12-19 | 康容生物科技(太仓)有限公司 | Integrated external piston pipette suction head |
| CN117244602B (en) * | 2023-09-28 | 2024-05-24 | 康容生物科技(太仓)有限公司 | Integrated external piston pipette suction head |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20201211 |
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| WW01 | Invention patent application withdrawn after publication |