CN112156820A - Dropper with accurate metering function and using method thereof - Google Patents
Dropper with accurate metering function and using method thereof Download PDFInfo
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- CN112156820A CN112156820A CN202010886310.3A CN202010886310A CN112156820A CN 112156820 A CN112156820 A CN 112156820A CN 202010886310 A CN202010886310 A CN 202010886310A CN 112156820 A CN112156820 A CN 112156820A
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- dropper
- solution
- pipe
- external threaded
- adjusting knob
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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
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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
- B01L3/0289—Apparatus for withdrawing or distributing predetermined quantities of fluid
- B01L3/0293—Apparatus for withdrawing or distributing predetermined quantities of fluid for liquids
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Clinical Laboratory Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a dropper with accurate metering and a using method thereof, and the dropper comprises a glass tube, wherein the front side of the glass tube is provided with a first scale, the upper end of the glass tube is fixedly connected with an end cover, an external thread tube is sleeved in the end cover in a sliding manner, an adjusting knob is arranged above the end cover and is in threaded connection with the external thread tube, the lower end of the external thread tube is in threaded connection with a sealing plug, a polymer membrane is arranged in the sealing plug, a rubber air bag is arranged at the upper end of the external thread tube, and a second scale is arranged at one side of the external thread tube. Making it less prone to shifting.
Description
Technical Field
The invention relates to the technical field of experimental instruments, in particular to a dropper with accurate metering and a using method thereof.
Background
The rubber head dropper is also called a rubber cap dropper and is a common instrument for sucking or dropping a small amount of liquid reagent. The rubber head dropper consists of a rubber cap and a glass tube. The buffer ball has a straight shape, a buffer ball in the bent shape and the like. The specification of the rubber head dropper is expressed by the length of the dropper, and the dropper is usually 90mm and 100mm 2.
Each drop of the rubber-tipped dropper is about 0.05ml, and the rubber-tipped dropper consists of a rubber cap and a glass tube. The holding method comprises holding the glass part with middle finger and ring finger to keep stability, and squeezing the rubber head with thumb and index finger to control the amount of the reagent to be inhaled or dripped; when the rubber-head dropper is used for adding liquid, the rubber-head dropper can not extend into the container and can not contact the container, and the rubber-head dropper is vertically suspended above the container by 0.5 cm; can not be inverted, can not be laid on a table top, and can be inserted into a clean bottle or a test tube; after the reagent is used up, immediately washing the reagent with water, and sucking another reagent if the reagent is not washed; the rubber cap and the glass dropper are tightly combined without air leakage, and if the rubber cap is aged, the rubber cap needs to be replaced in time; when toxic or corrosive liquid is dripped into the test tube by the rubber head dropper, the tip of the dropper is allowed to contact the inner wall of the test tube; the dropper needs to be prevented from being directly irradiated by sunlight for a long time during ordinary storage, and needs to be cleaned, dried and stored after experimental use.
However, the solution transferred by the rubber head dropper cannot be accurately quantified, and for some tests with higher precision, the precision is insufficient, so that the test result is influenced, and even the test fails, and therefore, a dropper capable of accurately quantifying a small amount of solution is needed.
Disclosure of Invention
The invention aims to provide a dropper with accurate metering and a using method thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a burette of accurate measurement, includes the glass pipe, the glass pipe lower extreme is the sharp mouth, is made by transparent glass, and glass pipe front side is provided with scale one, and glass pipe upper end fixedly connected with end cover slides in the end cover and has cup jointed the external screw thread pipe, and the end cover lower part is provided with the mounting groove that corresponds with the glass pipe.
As a further scheme of the invention: the outer threaded pipe is a hollow alloy pipe with threads arranged on the outer surface, a first through hole corresponding to the outer threaded rod is formed in the center of the end cover, and the diameter of the first through hole is consistent with the outer diameter of the outer threaded pipe.
As a further scheme of the invention: an adjusting knob is installed above the end cover, an L-shaped clamp is fixedly connected to the bottom of the adjusting knob, the adjusting knob is rotatably connected with the end cover and is in threaded connection with the external threaded pipe, a first threaded hole corresponding to the external threaded pipe is formed in the adjusting knob, and a sliding groove corresponding to the L-shaped clamp is formed in the end cover.
As a further scheme of the invention: the L-shaped clamp is provided with a compression ring, the compression ring is fixedly connected with the end cover through a screw, a second threaded hole corresponding to the screw is formed in the compression ring and the end cover, the inner diameter of the compression ring is consistent with the outer diameter of the adjusting knob, and the outer diameter of the compression ring is consistent with the outer diameter of the end cover.
As a further scheme of the invention: the lower end of the outer threaded pipe is in threaded connection with a sealing plug, the diameter of the sealing plug is larger than the inner diameter of the glass pipe by 0.1-0.2mm, the sealing plug is in interference connection with the glass pipe, a second through hole corresponding to the outer threaded pipe is formed in the lower portion of the sealing plug, the diameter of the second through hole is consistent with the inner diameter of the outer threaded pipe, a third threaded hole corresponding to the outer threaded pipe is formed in the upper side of the second through hole, a polymer film is installed at the bottom of the outer threaded pipe and is breathable and does not allow water molecules to pass through, and the diameter of the polymer film is.
As a further scheme of the invention: the upper fixing ring and the lower fixing ring are installed on the upper side and the lower side of the polymer film, the outer diameter of the upper fixing ring and the outer diameter of the lower fixing ring are consistent with the outer diameter of the outer threaded pipe, the contact pin is arranged on the lower fixing ring and integrally formed with the lower fixing ring, the slot corresponding to the contact pin is formed in the bottom of the upper fixing ring, and the upper portion of the contact pin penetrates through the interference fit between the polymer film and the slot.
As a further scheme of the invention: the upper part of the external thread pipe is fixedly connected with a limiting ring.
As a further scheme of the invention: the rubber air bag is installed at the upper end of the external threaded pipe, and the rubber air bag, the external threaded pipe and the limiting ring are fixedly connected.
As a further scheme of the invention: and a second scale is arranged on one side of the external threaded pipe, and the precision of the second scale is one tenth of that of the first scale.
A use method of a dropper with accurate metering comprises the following steps:
firstly, when the dropper is used, firstly, the adjusting knob is rotated, the external thread pipe drives the sealing plug to move to a proper position, and the maximum suction amount of the dropper is determined according to the first scale.
And step two, pinching the rubber air bag, putting the tip part at the lower end of the dropper into the solution to be transferred, and then loosening the rubber air bag to suck the solution into the glass tube.
And step three, because the polymer membrane only allows air to pass through, the sucked solution can be accurately limited to a set amount.
And step four, when the solution in the dropper is required to be dripped into the container to be transferred, the air can form pressure on the solution from the inner cavity of the external thread tube through the polymer film by only extruding the rubber air bag, so that the solution is transferred to the container to be transferred at one time.
And step five, if only a small amount of solution needs to be quantitatively transferred at one time, the outer threaded pipe drives the sealing plug to move downwards by rotating the adjusting knob, so that the solution in the dropper is extruded, and the solution is quantitatively dripped in a small amount by referring to the scale II.
And step six, repeatedly operating in such a way, dripping a small amount of solution for multiple times until the sealing plug can not extrude the solution in the dropper, optionally extruding by using a rubber air bag to ensure that the residual solution completely drips to reach the set amount of solution transfer, or absorbing the solution again to accurately transfer through the adjusting knob until the set amount of solution transfer is reached.
And step seven, after the dropper is used, adjusting the sealing plug to the uppermost end through the adjusting knob, then fully sucking distilled water by the dropper, extruding out, repeatedly cleaning for several times, and inserting into a clean test tube for the next use.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the maximum suction volume of the dropper is conveniently determined by setting the first scale.
2. The invention is convenient to limit the maximum suction amount of the dropper by arranging the external thread pipe and the sealing plug.
3. The invention is convenient for accurately and quantitatively dripping a small amount of solution by arranging the adjusting knob and the scale II.
4. According to the invention, the molecular membrane is arranged, so that the ventilation is kept, water molecules are not allowed to pass through, the maximum solution transfer amount is limited conveniently, and the solution absorption is not influenced.
5. The upper fixing ring and the lower fixing ring are arranged, so that the polymer film is convenient to fix and is not easy to shift.
Drawings
Fig. 1 is a schematic view of a dropper with precise measurement.
Fig. 2 is a schematic sectional structural view of a dropper with accurate metering.
Fig. 3 is a schematic view of the structure of the external thread pipe.
Fig. 4 is an enlarged schematic view of a.
Fig. 5 is an enlarged structural diagram of B.
In the figure: the glass tube comprises a glass tube 1, a first scale 2, an end cover 3, an external threaded tube 4, a first through hole 5, a mounting groove 6, an adjusting knob 7, an L-shaped clamp 8, a first threaded hole 9, a sliding groove 10, a pressing ring 11, a screw 12, a second threaded hole 13, a sealing plug 14, a second through hole 15, a third threaded hole 16, a high polymer film 17, an upper fixing ring 18, a lower fixing ring 19, a contact pin 20, a slot 21, a limiting ring 22, a rubber air bag 23 and a second scale 24.
Detailed Description
Referring to fig. 1 to 5, in an embodiment of the present invention, a dropper with accurate metering includes a glass tube 1, a tip is disposed at a lower end of the glass tube 1, the glass tube is made of transparent glass, a scale 1 is disposed at a front side of the glass tube 1, so that a maximum suction amount of the dropper is determined, and an end cover 3 is fixedly connected to an upper end of the glass tube 1.
Preferably, the end cover 3 is internally and slidably sleeved with an external threaded pipe 4, the external threaded pipe 4 is a hollow alloy pipe with threads arranged on the outer surface, the center of the end cover 3 is provided with a through hole I5 corresponding to the external threaded rod 3, the diameter of the through hole I5 is consistent with the outer diameter of the external threaded pipe 4, the lower part of the end cover 3 is provided with a mounting groove 6 corresponding to the glass pipe 1, the end cover 3 is provided with an adjusting knob 7, the bottom of the adjusting knob 7 is fixedly connected with an L-shaped clamp 8, the adjusting knob 7 is rotatably connected with the end cover 3, the adjusting knob 7 is in threaded connection with the external threaded pipe 4, the adjusting knob 7 is internally provided with a threaded hole I9 corresponding to the external threaded pipe 4, the end cover 3 is provided with a chute 10 corresponding to the L-shaped clamp 8, the L-shaped clamp 8 is provided with a pressing ring 11, the pressing ring 11 is fixedly connected with the end cover 3 through a screw 12, the inner diameter of the pressing ring 11 is consistent with the outer diameter of the adjusting knob 7, and the outer diameter of the pressing ring 11 is consistent with the outer diameter of the end cover 3.
Preferably, the lower end of the external thread pipe 4 is in threaded connection with a sealing plug 14, the diameter of the sealing plug 14 is 0.1-0.2mm larger than the inner diameter of the glass pipe 1, the sealing plug 14 is in interference connection with the glass pipe 1, the lower part of the sealing plug 14 is provided with a second through hole 15 corresponding to the external thread pipe 4, so that the maximum transfer amount is limited and the solution absorption is not affected, the diameter of the second through hole 15 is consistent with the inner diameter of the external thread pipe 4, the upper side of the second through hole 15 is provided with a third threaded hole 16 corresponding to the external thread pipe 4, the bottom of the external thread pipe 4 is provided with a polymeric membrane 17, the polymeric membrane 17 is air-permeable and does not allow water molecules to pass through, the diameter of the polymeric membrane 17 is consistent with the outer diameter of the external thread pipe 4, the upper and lower fixing rings 18 and 19 are arranged on the upper and lower sides of the polymeric membrane 17, the outer diameters of, the insertion needle 20 and the lower fixing ring 19 are integrated, the bottom of the upper fixing ring 18 is provided with a slot 21 corresponding to the insertion needle 20, the upper part of the insertion needle 20 penetrates through the polymer film 17 and is in interference fit with the slot 21, so that the polymer film 17 is fixed conveniently and is not easy to shift, and the arrangement of the external threaded pipe 4 and the sealing plug 14 facilitates limiting the maximum suction amount of the dropper.
Preferably, the upper part of the external thread pipe 4 is fixedly connected with a limiting ring 22 which can limit the downward moving position of the external thread pipe 4, the upper end of the external thread pipe 4 is provided with a rubber air bag 23 which is used for extruding and absorbing solution, the rubber air bag 23 is fixedly connected with the external thread pipe 4 and the limiting ring 22, the rubber air bag is replaceable, one side of the external thread pipe 4 is provided with a second scale 24, the precision of the second scale 24 is one tenth of the first scale 2, and the adjusting knob 7 and the second scale 24 are convenient for accurately and quantitatively dripping a small amount of solution.
A use method of a dropper with accurate metering comprises the following steps:
firstly, when the dropper is used, firstly, the adjusting knob 7 is rotated to enable the external thread pipe 4 to drive the sealing plug 14 to move to a proper position, and the maximum sucking amount of the dropper is determined according to the first scale 2.
And step two, pinching the rubber air bag 23, putting the tip part at the lower end of the dropper into the solution to be transferred, then loosening the rubber air bag 23, and sucking the solution into the glass tube 1.
And step three, because the polymer membrane 17 only allows air to pass through, the sucked solution can be accurately limited to a set amount.
And step four, when the solution in the dropper is required to be dripped into the container to be transferred, the air can form pressure on the solution from the inner cavity of the external thread pipe 4 through the polymer film 17 by only extruding the rubber air bag 23, so that the solution is transferred to the container to be transferred at one time.
And step five, if only a small amount of solution needs to be quantitatively transferred at one time, the adjusting knob 7 can be rotated to enable the external thread pipe 4 to drive the sealing plug 14 to move downwards, so that the solution in the dropper is extruded, and the solution is quantitatively dripped in a small amount by referring to the second scale 24.
And step six, repeatedly operating in such a way, dripping a small amount of solution for multiple times until the sealing plug 14 cannot extrude the solution in the dropper, optionally extruding by using the rubber air bag 23 to completely drip the residual solution to reach the set amount of solution transfer, or absorbing the solution again to accurately transfer through the adjusting knob 7 until the set amount of solution transfer is reached.
And step seven, after the dropper is used, adjusting the sealing plug 14 to the uppermost end through the adjusting knob 7, then sucking distilled water by the dropper, extruding out, repeatedly cleaning for several times, and inserting into a clean test tube for the next use.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a burette of accurate measurement, includes glass pipe (1), its characterized in that, glass pipe (1) lower extreme is sharp mouth, is made by transparent glass, and glass pipe (1) front side is provided with scale (2), and glass pipe (1) upper end fixedly connected with end cover (3), and interior slip cup joint of end cover (3) has outer screw thread pipe (4), and end cover (3) lower part is provided with mounting groove (6) that correspond with glass pipe (1).
2. The dropper with precise metering as claimed in claim 1, wherein the external threaded pipe (4) is a hollow alloy pipe with threads on the outer surface, a first through hole (5) corresponding to the external threaded rod (3) is formed in the center of the end cover (3), and the diameter of the first through hole (5) is consistent with the outer diameter of the external threaded pipe (4).
3. The dropper with accurate metering according to claim 1, wherein an adjusting knob (7) is mounted above the end cap (3), an L-shaped clamp (8) is fixedly connected to the bottom of the adjusting knob (7), the adjusting knob (7) is rotatably connected to the end cap (3), the adjusting knob (7) is in threaded connection with the external threaded pipe (4), a first threaded hole (9) corresponding to the external threaded pipe (4) is formed in the adjusting knob (7), and a sliding groove (10) corresponding to the L-shaped clamp (8) is formed in the end cap (3).
4. The dropper with the accurate metering function according to claim 3, wherein the L-shaped clamp (8) is provided with a pressing ring (11), the pressing ring (11) is fixedly connected with the end cover (3) through a screw (12), the pressing ring (11) and the end cover (3) are provided with a second threaded hole (13) corresponding to the screw (12), the inner diameter of the pressing ring (11) is consistent with the outer diameter of the adjusting knob (7), and the outer diameter of the pressing ring (11) is consistent with the outer diameter of the end cover (3).
5. The dropper with the accurate metering function according to claim 1, wherein a sealing plug (14) is connected to the lower end of the external threaded pipe (4) in a threaded manner, the diameter of the sealing plug (14) is larger than the inner diameter of the glass pipe (1) by 0.1-0.2mm, the sealing plug (14) is in interference fit with the glass pipe (1), a second through hole (15) corresponding to the external threaded pipe (4) is formed in the lower portion of the sealing plug (14), the diameter of the second through hole (15) is consistent with the inner diameter of the external threaded pipe (4), a third threaded hole (16) corresponding to the external threaded pipe (4) is formed in the upper side of the second through hole (15), a polymer film (17) is installed at the bottom of the external threaded pipe (4), the polymer film (17) is air-permeable and does not allow water molecules to pass through, and the diameter of the polymer film (17) is consistent with.
6. The dropper with precise metering as claimed in claim 5, wherein the upper fixing ring (18) and the lower fixing ring (19) are mounted on the upper side and the lower side of the polymer membrane (17), the outer diameters of the upper fixing ring (18) and the lower fixing ring (19) are the same as the outer diameter of the external threaded pipe (4), the lower fixing ring (19) is provided with a pin (20), the pin (20) and the lower fixing ring (19) are integrated, the bottom of the upper fixing ring (18) is provided with a slot (21) corresponding to the pin (20), and the upper portion of the pin (20) penetrates through the polymer membrane (17) and the slot (21) to form interference fit.
7. The burette of claim 1, wherein a stop ring (22) is fixedly connected to the upper portion of the external threaded tube (4).
8. The dropper with accurate metering as claimed in claim 7, wherein the rubber air bag (23) is mounted at the upper end of the external threaded pipe (4), and the rubber air bag (23), the external threaded pipe (4) and the limiting ring (22) are fixedly connected.
9. The dropper with accurate metering according to claim 1, wherein the external threaded pipe (4) is provided with a second scale (24) on one side, and the accuracy of the second scale (24) is one tenth of that of the first scale (2).
10. The method of using a precision metering burette of any of claims 1-9, comprising the steps of:
firstly, when the dropper is used, firstly, the adjusting knob (7) is rotated to enable the external thread pipe (4) to drive the sealing plug (14) to move to a proper position, and the maximum suction amount of the dropper is determined by referring to the first scale (2);
secondly, pinching the rubber air bag (23), putting the tip part at the lower end of the dropper into the solution to be transferred, then loosening the rubber air bag (23), and sucking the solution into the glass tube (1);
step three, because the polymer film (17) only allows air to pass through, the absorbed solution can be accurately limited to a set amount;
step four, when the solution in the dropper needs to be dripped into the container to be transferred, the air can form pressure on the solution from the inner cavity of the external thread tube (4) through the polymer film (17) by only extruding the rubber air bag (23), so that the solution is transferred to the container to be transferred at one time;
step five, if only a small amount of solution needs to be quantitatively transferred at one time, the adjusting knob (7) can be rotated to enable the external threaded pipe (4) to drive the sealing plug (14) to move downwards, so that the solution in the dropper is extruded, and the solution is quantitatively dropped in a small amount by referring to the second scale (24);
step six, repeatedly operating in such a way, dripping a small amount of solution for multiple times until the sealing plug (14) can not extrude the solution in the dropper, optionally extruding by using a rubber air bag (23) to enable the residual solution to completely drip to reach the set amount of solution transfer, or absorbing the solution again to accurately transfer through the adjusting knob (7) until the set amount of solution transfer is reached;
and step seven, after the dropper is used, adjusting the sealing plug (14) to the uppermost end through the adjusting knob (7), then sucking distilled water by the dropper, extruding out again, repeatedly cleaning for several times, and inserting into a clean test tube for the next use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010886310.3A CN112156820B (en) | 2020-08-28 | 2020-08-28 | Dropper with accurate metering function and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010886310.3A CN112156820B (en) | 2020-08-28 | 2020-08-28 | Dropper with accurate metering function and using method thereof |
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| CN112156820A true CN112156820A (en) | 2021-01-01 |
| CN112156820B CN112156820B (en) | 2022-01-07 |
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| CN208574657U (en) * | 2018-07-06 | 2019-03-05 | 黄泽浩 | A kind of liquid-transfering gun with waterproof ventilated membrane |
| CN209020408U (en) * | 2018-10-16 | 2019-06-25 | 兰州城市学院 | A kind of jacket type buret |
| CN209128420U (en) * | 2018-12-03 | 2019-07-19 | 曲秀兰 | Liquid-transfering device is used in a kind of inspection of novel microbial |
| CN210400943U (en) * | 2019-08-12 | 2020-04-24 | 威海职业学院 | Medical treatment is biochemical with multi-functional sampling tube |
| CN210752753U (en) * | 2019-09-30 | 2020-06-16 | 上海甲贝生物医药技术有限公司 | Arc pipettor suction head convenient to measurement for biological cultivation |
| CN211227138U (en) * | 2019-10-31 | 2020-08-11 | 薛莹雪 | Transfer device for cell culture |
| CN111114996A (en) * | 2019-12-26 | 2020-05-08 | 江苏福维健康科技有限公司 | Washing and protecting articles for use ration remove device |
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