CN217249021U - Self-suction quantitative pipette - Google Patents

Abstract

The utility model discloses a from inhaling quantitative pipette belongs to instrument analysis technical field. Including the bobbin, slidable mounting has first piston and pull rod in the bobbin, the bottom of pull rod with first piston fixed connection, the pull rod passes the bobbin, the top fixed mounting of pull rod has the first in command, the gear is installed to the bobbin internal rotation, be equipped with on the pull rod with gear assorted gear strip, the pull rod with gear engagement, the suction head is installed to the bottom of bobbin, the suction head with the bobbin intercommunication, the dwang is installed to the pull rod internal rotation, the bottom fixed mounting of dwang has the second piston, first piston be equipped with second piston assorted opening, first piston with the second piston rotates to be connected, the top fixed mounting of dwang has the second in command, the utility model discloses can absorb accurate solution for the experimental result is more accurate.

Description

Self-suction quantitative pipette

Technical Field

The utility model belongs to the technical field of the instrument analysis, specifically speaking relates to a from inhaling quantitative pipette.

Background

In the pharmaceutical chemical products, the product is sometimes hydrochloride, and usually, a titration mode of alkali liquor or silver nitrate is adopted for quantitative analysis. The pipette is used as a very important analytical chemical glass instrument and can accurately transfer quantitative solution, and the quantitative transfer is the most common experimental operation in all medical intermediates, fine chemical engineering and biological laboratories.

Present quantitative pipette most directly will take out during the quantitative liquid suction pipette, carry out next step experimental operation next time, the pipette that uses now generally comes liquid suction pipette through pulling first piston, but when observing the pipette scale through the first piston of artifical pulling simultaneously and getting quantitative liquid, the position that first piston stopped can't coincide completely and lead to the manual work to absorb quantitative liquid and can appear certain deviation, the liquid that has caused the experiment needs is got the volume and is inaccurate, make the result of experiment inaccurate, bring very big trouble for the user.

SUMMERY OF THE UTILITY MODEL

Certain deviation can appear to the first piston of current artifical pulling for the unsafe problem of result of experiment, the utility model provides a from inhaling quantitative pipette.

In order to solve the above problem, the utility model adopts the following technical scheme:

a self-priming quantitative pipette comprises a barrel, a first piston and a pull rod are arranged in the barrel in a sliding mode, the bottom end of the pull rod is fixedly connected with the first piston, the pull rod penetrates through the tube barrel, a first handle is fixedly arranged at the top end of the pull rod, a gear is rotatably arranged in the tube barrel, a gear rack matched with the gear is arranged on the pull rod, the pull rod is engaged with the gear, the bottom end of the pipe barrel is provided with a suction head which is communicated with the pipe barrel, a rotating rod is rotatably arranged in the pull rod, a second piston is fixedly arranged at the bottom end of the rotating rod, the first piston is provided with a through hole matched with the second piston, the first piston is rotationally connected with the second piston, the top fixed mounting of dwang has the second handle, the dwang with first handle threaded connection.

In order to observe the imbibition inside the barrel, the barrel is preferably a transparent glass barrel.

In order to measure the liquid amount sucked, furthermore, the outer wall of the pipe barrel is provided with a measuring scale mark.

In order not to allow the air pressure within the barrel to affect the sliding movement of the first piston, it is preferred that the top end of the barrel is hollowed out with a vent hole.

For more stable holding during use, it is preferred that the outer wall of the barrel is provided with non-slip threads.

In order to be able to replace suction heads of different models and lengths, it is preferred that the suction head is in threaded connection with the barrel.

Compared with the prior art, the utility model provides a from inhaling quantitative pipette, the utility model discloses possess following beneficial effect:

the part which is not involved in the device is the same as the prior art or can be realized by the prior art, the utility model extends the pipe orifice of the suction head into the solvent bottle which needs to be sucked, pulls the first handle, the first piston slides upwards to suck the solution from the solvent bottle, the sucked solution is lower than the required metering scale, the gear is rotated slowly, the pull rod is slowly moved upwards, the first piston is slowly slid upwards to enable the solution to slowly enter the pipe barrel, the sucked solution is slightly lower than the required metering scale, the second handle is rotated, the second piston is slowly slid upwards to enable the solution to slowly and stably enter the pipe barrel, thus sucking a small amount of accurate solution again until the solution level is flush with the metering scale, sucking the solution in three steps, the control amount of solution suction is more and more fine, so that the sucked solution amount is gradually close to the required solution amount, and finally, the experimental result is more accurate.

Drawings

Fig. 1 is a schematic diagram of an external structure of a self-priming quantitative pipette according to the present invention;

fig. 2 is a schematic diagram of the internal structure of a self-priming quantitative pipette according to the present invention;

fig. 3 is a schematic view of a structure of a pull rod and a gear of a self-priming quantitative pipette according to the present invention;

fig. 4 is a schematic top view of a tube of a self-priming quantitative pipette according to the present invention.

In the figure: 1. a pipe barrel; 101. a vent hole; 102. anti-skid lines; 2. a first piston; 3. a pull rod; 301. a first handle; 4. a gear; 5. a suction head; 6. rotating the rod; 601. a second handle; 7. a second piston.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Example (b):

referring to fig. 1-4, a self-priming quantitative pipette comprises a barrel 1, a first piston 2 and a pull rod 3 are slidably mounted in the barrel 1, the bottom end of the pull rod 3 is fixedly connected with the first piston 2, the pull rod 3 penetrates through the barrel 1, a first handle 301 is fixedly mounted at the top end of the pull rod 3, a gear 4 is rotatably mounted in the barrel 1, a gear strip matched with the gear 4 is arranged on the pull rod 3, the pull rod 3 is meshed with the gear 4, a suction head 5 is mounted at the bottom end of the barrel 1, the suction head 5 is communicated with the barrel 1, a rotating rod 6 is rotatably mounted in the pull rod 3, a second piston 7 is fixedly mounted at the bottom end of the rotating rod 6, the first piston 2 is provided with a through hole matched with the second piston 7, the first piston 2 is rotatably connected with the second piston 7, a second handle 601 is fixedly mounted at the top end of the rotating rod 6, and the rotating rod 6 is in threaded connection with the first handle 301.

The pipe barrel 1 is a transparent glass pipe, the outer wall of the pipe barrel 1 is provided with metering scale marks, and the amount of the solution liquid sucked at present can be accurately judged through the transparent glass and the metering scale marks.

The top end of the tube 1 is dug with a vent hole 101, when the first piston 2 slides upwards, the air pressure of the upper part in the tube 1 can be increased to block the sliding of the first piston 2, and the air pressure of the upper part in the tube 1 can not be changed by opening the vent hole 101.

The outer wall of the pipe barrel 1 is provided with anti-slip threads 102, and friction force is increased through the anti-slip threads 102, so that excessive liquid amount sucked due to hand slip is prevented.

The suction head 5 is in threaded connection with the pipe barrel 1, and the suction heads 5 of different models and lengths are replaced through threaded connection.

The utility model discloses be applied to experimental device technical field, install on bobbin 1 through the suction head 5 spiral with suitable model, stretch into the solvent bottle that needs the absorption with the mouth of pipe of suction head 5, stimulate the first in command 301, absorb solution from the solvent bottle, let the liquid level be less than required measurement, slow rotating gear 4, let pull rod 3 lift slowly, let the liquid level be slightly less than required measurement scale, hold the first in command 301, rotate the second in command 601 and let dwang 6 rebound when the 3 internal rotations of pull rod, make second piston 7 also upwards slide in the opening of first piston 2, let the air pressure of bobbin 1 interior lower half further reduce, let solution more slowly and stable suction bobbin 1 in, reach required measurement scale until the liquid level, make solution can accurately absorb.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (6)

1. The utility model provides a from inhaling quantitative pipette, its characterized in that includes bobbin (1), slidable mounting has first piston (2) and pull rod (3) in bobbin (1), the bottom of pull rod (3) with first piston (2) fixed connection, pull rod (3) pass bobbin (1), the top fixed mounting of pull rod (3) has first in command (301), gear (4) are installed to bobbin (1) internal rotation, be equipped with on pull rod (3) with gear (4) assorted gear strip, pull rod (3) with gear (4) meshing, suction head (5) are installed to the bottom of bobbin (1), suction head (5) with bobbin (1) intercommunication, dwang (6) are installed to pull rod (3) internal rotation, the bottom fixed mounting of dwang (6) has second piston (7), first piston (2) be equipped with second piston (7) assorted opening, first piston (2) with second piston (7) rotate to be connected, the top fixed mounting of dwang (6) has second handle (601), dwang (6) with first handle (301) threaded connection.

2. The self-priming quantitative pipette according to claim 1, characterized in that the barrel (1) is a transparent glass barrel.

3. The self-priming quantitative pipette according to claim 2, characterized in that the outer wall of the barrel (1) is provided with metering graduation marks.

4. The self-priming quantitative pipette according to claim 1, characterized in that the top end of the barrel (1) is hollowed with a vent hole (101).

5. The self-priming quantitative pipette according to claim 1, characterized in that the outer wall of the barrel (1) is provided with anti-slip threads (102).

6. The self-priming quantitative pipette according to claim 1, characterized in that the tip (5) is screwed to the barrel (1).

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