CN106492896A - A kind of liquid-transfering device for volatile liquid - Google Patents

Abstract

The invention discloses a pipetting device for volatile liquids. During the experimental operation, pipetting is one of the common operations. In view of the fact that the existing pipetting device cannot avoid direct contact of volatile liquids with the outside air, a pipetting device for volatile liquids is designed, in which the pipetting plug 1 is stuck on the inlet tube, and the inlet tube and the catheter Connected by the connecting plate 1, the liquid inlet pipe and the air guide tube are at the same level, the baffle is located at the boundary between the liquid guide tube and the air guide tube, the rubber tube connects the air guide tube and the pipetting barrel, the piston rod and the piston are solidified together, and the liquid is discharged The tube is connected with the catheter through the connecting plate 2, and the pipetting plug 2 is stuck on the outlet tube. The invention has the advantages of simple structure and convenient operation, and can effectively prevent the volatile liquid from being in direct contact with the air during the re-pipetting process, volatilizing into the air and damaging human health.

Description

A pipetting device for volatile liquids

technical field

The invention relates to the field of experimental equipment, in particular to a pipetting device for volatile liquids.

Background technique

During the experimental operation, pipetting is one of the common operations. For volatile liquids, sometimes limited by the laboratory's own conditions, it cannot be operated in a fume hood. When using a common pipetting device in the laboratory, the volatile liquid will directly contact with the outside air and volatilize into the air, making the experiment The air in the room is polluted, which may even damage the health of the operator. For example, in the process of testing chlorophyll in water, it is necessary to add acetone to extract chlorophyll. Acetone is volatile and has certain toxicity. Inhalation of the human body will cause damage to the human body. , acetone will volatilize into the air. Simultaneously, also can have the liquid to volatilize in the external air, make the operator's health threatened.

Contents of the invention

1. Purpose of the present invention:

A liquid pipetting device for pipetting volatile liquid is provided. The liquid pipetting device is simple in structure and easy to operate, and can effectively prevent the volatile liquid from volatilizing into the air during the liquid pipetting process, which will damage the health of the operator.

2. Technical scheme of the present invention:

In order to achieve the above object, the present invention, a pipetting device for volatile liquids, includes a liquid inlet pipe, a pipetting plug 1, a connecting plate 1, a catheter, a baffle, an air guide tube, a rubber tube, a pipetting barrel, Piston rod, piston, connecting plate 2, liquid outlet pipe and pipetting plug 2.

Preferably, the liquid inlet tube is a glass tube inserted into the reagent bottle to be pipetted.

Preferably: the pipetting plug 1 is a trapezoidal rubber piston in both the front view and the side view, wherein there is a perforation in the center of the piston, the diameter of the perforation is the same as the outer diameter of the liquid inlet tube, and the rubber piston can have different diameters and sizes To adapt to different reagent bottle mouths for holding liquids.

Preferably: the connecting plate 1 is a semi-arc connecting plate connecting the liquid inlet tube and the catheter tube on the lower inner surface, which can effectively reduce the sudden change of the angle, increase buffering, and ensure that the liquid can smoothly flow from the inlet The liquid tube enters the catheter.

Preferably: the catheter is connected to the liquid inlet pipe, the liquid outlet pipe and the air guide tube, the liquid can flow into the liquid outlet pipe through the catheter tube, the upper surface of the catheter tube is horizontal, and the lower surface is inclined. The diameter of the end connected to the liquid inlet pipe is smaller than the diameter of the end connected to the liquid outlet pipe, which can reduce the resistance of the liquid flowing into the liquid outlet pipe, reduce the retention of liquid in the catheter tube, and ensure that the liquid can flow smoothly into the liquid outlet pipe. Reduce fluid loss.

Preferably, the baffle is located at the joint between the liquid inlet pipe and the air guide tube, connected to the lower inner surface, and its height is 1.5mm smaller than the diameter of the air guide tube, so as to prevent the liquid from entering the air guide tube with the airflow.

Preferably, one end of the air guiding tube is connected to the catheter, and the other end can be connected to a rubber tube.

Preferably: the rubber tube is made of rubber, and can connect the airway tube with the pipetting barrel.

Preferably, the pipetting barrel is an annular thin-walled cylinder with two ends open, with scales on the outer surface, the diameter of one end gradually decreases to the same diameter as the air guide tube, and the end with a smaller diameter is connected to the rubber tube, and the piston moves from The larger diameter end enters.

Preferably, the piston rod is fixed together with the piston, and external force can use the piston rod to make the piston freely move back and forth in the pipetting barrel.

Preferably, the piston is made of rubber, its diameter is the same as the inner diameter of the pipetting barrel, it has good contact with the inner wall of the pipetting barrel, and can move back and forth in the pipetting barrel.

Preferably: the connecting plate 2 is a semi-arc connecting plate connecting the catheter and the outlet pipe on the lower inner surface, which can effectively reduce the sudden change of the angle, increase the buffer, and ensure that the liquid can flow smoothly from the guide to the outlet. The liquid pipe enters the liquid outlet pipe.

Preferably: said liquid outlet pipe is a glass pipe inserted into a laboratory vessel to be filled with liquid.

Preferably: the pipetting plug 2 is a trapezoidal rubber piston in both the front view and the side view, wherein there is a perforation in the center of the piston, the diameter of the perforation is the same as the diameter of the liquid outlet pipe, and the rubber piston can have different diameters and sizes. It is suitable for different experimental vessel mouths to be filled with liquids.

Preferably, all the interfaces of the whole device are well sealed.

Description of drawings

Fig. 1 is an overall view of the device.

FIG. 2 is an enlarged view of the connection plate 1 or the connection plate 2 .

Fig. 3 is an enlarged view of the baffle.

FIG. 4 is a top view, a left side view and a front view of the pipetting plug 1 or the pipetting plug 2 .

detailed description

The present invention will be further described below in conjunction with specific examples.

As shown in Figure 1, a pipetting device for volatile liquids mainly includes a liquid inlet tube (1), a pipetting plug 1 (2), a connecting plate 1 (3), a catheter (4), a baffle ( 5), air guide tube (6), rubber tube (7), pipetting barrel (8), piston rod (9), piston (10), connecting plate 2 (11), liquid outlet pipe (12) and pipetting plug 2(13).

During use, the piston rod (9) is used to place the piston (10) on the top of the pipetting barrel (8), and the air guide tube (6) is connected to the catheter tube (4) by the rubber tube (7).

Then insert the liquid inlet tube (1) into the reagent bottle containing the liquid, and insert the pipette plug 1 (2), as shown in Figure 4, into the mouth of the reagent bottle by rotation to ensure good sealing in the reagent bottle; (12) Insert into the experimental vessel to be filled with liquid, and insert the pipette plug 2 (13), as shown in Figure 4, into the mouth of the experimental vessel to be filled with liquid, to ensure good sealing in the experimental vessel to be filled with liquid.

Finally, pull the piston rod (9) outward, the piston (10) moves outward, the air pressure in the device is lower than the air pressure in the reagent bottle, and the liquid will flow through the connecting plate 1 (3) along the liquid inlet pipe (1), as shown in Figure 2 As shown in (1), flow through the connecting plate 2 (11) through the catheter (4), as shown in Figure 2 (2), and finally enter the experimental vessel to be filled with liquid through the liquid outlet pipe (12). When the liquid flows through the connecting plate 2 (11), the baffle (5), as shown in Figure 3, can effectively prevent the liquid from entering the air guide tube (6), and only allow the gas to enter.

After pipetting, pull out the pipetting plug 1 (2) and pipetting plug 2 (13) from the mouth of the reagent bottle and the mouth of the experimental vessel to contain the liquid, rinse the device and continue to repeat the above steps for pipetting Or disconnect the rubber tube (7) from the air guide tube (6) and the pipette barrel (8), clean the device and put it away.

Claims (8)

1. A pipetting device for volatile liquids, mainly comprising a liquid inlet tube (1), a pipetting plug 1 (2), a connecting plate 1 (3), a catheter (4), a baffle (5), Air guide tube (6), rubber tube (7), pipetting barrel (8), piston rod (9), piston (10), connecting plate 2 (11), liquid outlet tube (12) and pipetting plug 2 (13 ). 2. A kind of pipetting device for volatile liquids according to claim 1, characterized in that said pipetting plug 1 (2), pipetting plug 2 (13) are trapezoidal in front view and side view The rubber piston has a perforation in the central part of the rubber piston, and the rubber piston can have different diameters and sizes to adapt to different reagent bottle mouths containing liquids or different experimental vessel mouths to be filled with liquids. 3. A pipetting device for volatile liquids according to claim 1, characterized in that the connecting plate 1 (3) is connected to the liquid inlet tube (1) and the catheter tube (4) on the lower inner surface The semi-arc connecting plate, connecting plate 2 (11) is the semi-arc connecting plate that connects the catheter tube (4) and the liquid outlet pipe (12) at the lower inner surface. 4. A pipetting device for volatile liquids according to claim 1, characterized in that the catheter (4) is connected to the liquid inlet pipe (1) and the liquid outlet pipe (12) and the air duct (6), the upper surface of the catheter (4) is horizontal and the lower surface is inclined, wherein the diameter of the end connected to the liquid inlet pipe (1) is smaller than the diameter of the end connected to the liquid outlet pipe (12). 5. A pipetting device for volatile liquids according to claim 1, characterized in that the baffle (5) is located at the part where the liquid inlet pipe (1) connects with the air guide pipe (6), and The lower inner surface is connected, and its height is 1.5mm smaller than the diameter of the airway tube (6). 6. A pipetting device for volatile liquids according to claim 1, characterized in that one end of the air guide tube (6) is connected to the catheter tube (4), and the other end can be connected to a rubber tube (7 ), the rubber tube (7) can connect the airway (6) with the pipetting barrel (8). 7. A pipetting device for volatile liquids according to claim 1, characterized in that the pipetting barrel (8) is an annular thin-walled cylinder with two ends open, and a scale on the outer surface, wherein the diameter of one end decreases slowly To the same diameter as the airway tube (6). 8. A pipetting device for volatile liquids according to claim 1, characterized in that the piston rod (9) is consolidated with the piston (10), and the diameter of the piston (10) is the same as that of the pipette. The inner diameters of the liquid barrels (8) are identical, and have good contact with the inner wall of the pipetting barrel (8), and can freely move back and forth in the pipetting barrel (8).