JPH0335377Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a glass dropping funnel used in chemical experiments, analytical chemistry, etc.

[Problems to be solved by conventional techniques and ideas]

Conventionally, the valve for adjusting the dropping amount of a dropping funnel used for titration in chemical analysis, etc. is usually made of glass, and as shown in FIG.
is fixed, and a through hole is provided in the middle of the drip tube 4 to fit with the outer peripheral surface of a rotation adjustment valve 11 which is approximately cylindrical and whose inner peripheral surface is in the shape of a truncated cone, and which communicates with the drip tubes 4 and 4 at the upper and lower portions, respectively. A seat portion 12 is formed in the horizontal direction, and a communication hole 13 is provided in the center of the rotation adjustment valve 11 to communicate with each of the through holes. Furthermore, since the above-mentioned fitting surfaces are sliding surfaces of glass, the rotation adjustment valve can be easily rotated even when brought into close contact with each other, and liquid leakage can be prevented.

Such a dripping amount adjustment valve can be adjusted by rotating the rotation adjustment valve 11 and opening the communication hole 13 as shown in FIG.
The dripping tubes 4, 4 are brought into communication with each other in the vertical direction, so that the dripping tubes 4, 4 are fully opened, and as the dripping tube rotates from this state, the dripping flow rate gradually decreases until the dripping tube is fully closed. However, since the dripping flow rate at this time is determined by the slight amount of rotation of the rotation adjustment valve, the communication hole 13 and the seat portion 1
Although fine adjustment of the degree of communication with the through hole 2, that is, the valve opening degree, is essential, it requires skill.
In general, it was very difficult.

[Means for solving problems]

With this in mind, after various studies, we have developed a dripping funnel that can reliably adjust the flow rate.A lid is provided at the top of the main container that stores the liquid to seal the inside of the container, and the dripping funnel is placed at the bottom of the container. A liquid dripping tube with a volume adjustment valve installed at the top is fixed, and the dripping tube is enclosed in the lower part of the dripping tube, and the outer circumferential surface is a sliding surface of glass and fits into the opening of another container. A nearly cylindrical fitting lid with an open bottom is provided to seal the
The dropping funnel, which communicates between the upper part of the main container and the inside of the fitting lid, is characterized by being provided with a dripping amount adjustment valve made of a Teflon needle valve that opens and closes by screw action.

[Effect]

The dripping amount adjustment valve consists of a Teflon needle valve that opens and closes with a screw action. One end of the Teflon cylinder has a conical tip and the other end has a male thread on the outer circumferential surface. It is screwed into a female thread formed integrally with the drip tube, and a part of the flow path inside the drip tube is formed on a conical seat surface that fits into the conical tip of the needle valve. The reason why such a needle valve is used is that when the needle valve is screwed in and fitted to the seat surface, there is no rotational play and the Teflon conical tip securely comes into close contact with the seat surface, closing the flow path of the drip tube. Therefore, when the needle valve is rotated to gradually increase the gap between the tip of the valve and the seat surface, the valve opening corresponding to the rotation speed can be obtained. Unlike the previous case, where the angle difference between the fully closed position and the fully closed position was extremely small, around 10 degrees at most, adjustment can now be made over a large angle range (usually 360 degrees or more), and the rotation angle is different between the male and female. It is determined by the pitch of the screw, and the smaller the pitch, the easier it is to handle because it becomes possible to adjust the opening degree. The needle valve is made of Teflon because Teflon is not easily attacked by chemicals and has good adhesion to glass, which is the mating material.

〔Example〕

Next, embodiments of the present invention will be described.

As shown in FIG. 1, a glass bulb stopper 2 is provided at the upper end of a glass cylindrical container 1 with a scale for storing liquid, and a dripping amount adjustment valve consisting of a Teflon needle valve 3 is installed at the lower end of the container 1. A glass dropping tube 4 provided in the container was fixed. The needle valve 3
The cylinder has a conical tip 5 at one end, and a male thread 7 is formed on the outer peripheral surface of the other end.
It is configured such that it is screwed into a female screw 8 formed integrally with the drip tube 4, and the pointed end 5 fits into a conical sheet surface 6 formed in a part of the flow path of the drip tube 4. Therefore, by rotating the needle valve 3, the gap between the tip 5 and the seat surface 6 can be changed very slightly, and the rotational speed and the valve opening degree correspond accurately. Furthermore, the lower part of the dripping tube 4 contains the dripping tube 4, and has a generally cylindrical shape with an open bottom surface that forms a glass sliding surface on the outer circumferential surface and fits into the opening of another glass container to seal it with the other glass container. A glass fitting lid 9 was provided, and the upper part of the cylindrical container 1 and the inside of the fitting lid 9 were communicated through a side pipe 10 to produce a dropping funnel.

In this way, the dropping funnel is connected to the liquid level of the dripping liquid in the dropping funnel and the liquid level in the other container (not shown) through the side pipe 10, so the temperature and pressure of the outside air are affected. The same pressure is always applied, and the droplet flow rate depending on the opening degree of the needle valve 3 is always constant. Therefore, there is a good one-to-one correspondence between the number of rotations of the needle valve and the minute amount of the droplet flow rate.

The second example shows an example of the actual relationship between the rotation speed of the needle valve and the dripping flow rate using such a dropping funnel.
As shown in the figure. As can be seen from FIG. 2, it is clear that the amount of minute drops can be easily controlled by adjusting the rotational speed of the needle valve with good reproducibility.

[Effect of idea]

As described above, according to the present invention, the dripping flow rate of the dropping funnel can be accurately determined by the numerical value of the rotational speed of the valve, and remarkable effects such as easy adjustment of minute flow rates are achieved.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is an actual measurement diagram showing an example of the relationship between the needle valve rotation speed and the dripping flow rate using the dropping funnel of the present invention.
The figure is a sectional view showing a conventional drip amount adjustment valve. 1... Cylindrical container with scale, 2... Ball stopper, 3... Teflon needle valve, 4... Dripping tube, 5...
Pointed end, 6... Seat surface, 7... Male thread, 8...
Female thread, 9... Fitting lid, 10... Side pipe, 11...
Rotation adjustment valve, 12... Seat portion, 13... Communication hole.

Claims (1)

[Scope of utility model registration request] A lid that can seal the inside of the container is provided at the upper end of the main body container that stores the liquid, a liquid dripping tube with a dripping amount adjustment valve at the top is fixed to the lower end of the container, and a dripping tube is attached to the bottom of the dripping tube. A substantially cylindrical fitting lid with an open bottom surface that fits into the opening of another container and seals the other container with a sliding surface of glass on the outer circumferential surface is provided, and the fitting lid is fitted with the upper part inside the main container. 1. A glass dropping funnel, characterized in that the dropping funnel is provided with a dropping amount adjustment valve consisting of a Teflon needle valve that opens and closes by screw action.