JPH039764Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a filter for liquid filtration mainly used in laboratories, etc. Specifically, the invention is a filter for liquid filtration that is mainly used in laboratories, etc. The present invention relates to a filter that performs vacuum filtration and recovers the filtrate and substances collected on the filter medium.

(Prior art) Conventionally, in this type of device, a flange mechanism (Japanese Patent Laid-Open No. 58-61439
Some used the "fitting" structure (see Fig. 4) that utilized the plasticity of the material itself.

However, the flange mechanism has the disadvantage that it has a complicated structure and is difficult to operate.On the other hand, the fitting structure has the advantage of having a simple structure and easy operation. Since the fitting between the walls of the container is used, there are many variations in the strength of the fit due to variations in molding dimensions, and there are problems with airtightness such as leakage and difficulty in separating after fitting.
Furthermore, there is a drawback that the connection between the funnel, the filter media support and the filtrate receiver becomes loose during autoclave sterilization, transportation, and filtration operations, which impairs the safety of sterilization.

(Problems to be Solved by the Invention) The purpose of the present invention is to eliminate such conventional drawbacks and provide a filter for liquid filtration that is free from airtight leakage and is easy to attach and detach.

(Means for Solving the Problems) The gist of the present invention is to provide an upper funnel 1 for the liquid to be filtered, and a sheet-like filter medium tightly mounted in the bottom open annular wall 1a of the upper funnel. In a filter comprising a support part 3 and a filtrate receiver 5 having a reduced diameter head 5a that fits into the inner wall of an annular collar 3a extending below the support part, on the outer peripheral wall of the reduced diameter head 5a, Reduced diameter head 5a under fitted state
An O-ring is provided to maintain a tight state between the outer peripheral wall of the annular collar 3a and the inner wall of the annular collar 3a, and a lock is provided to maintain the fitted state between the inner wall of the annular collar 3a and the reduced diameter head 5a. There is provided a filter for liquid filtration, characterized in that a type fitting mechanism is provided.

The present invention will be explained based on embodiments shown in the drawings.

As shown in FIG. 4, a conventional filter for liquid filtration consists of an upper funnel 1 for the liquid to be filtered, a filter medium support part 3 that supports a sheet-like filter medium 2, and a filtrate receiver 5. The filtered stock solution put into the filtrate is filtered by the sheet-like filter medium 2 by the reduced pressure from the pressure reduction port 4, passes through the funnel part of the filter medium support part 3, and is collected in the filtrate receiver 5. Particles contained in the stock solution are collected on the surface of the sheet-like filter medium 2.

When used for particle analysis or bacterial analysis in the stock solution, the funnel 1 is separated from the filter medium support part 3,
This is done by taking out the sheet-like filter medium 2. On the other hand, when the filtrate is used, the funnel 1 or the filter medium support part 3 is removed from the filtrate receiver 5 and used for various purposes.

In addition, if necessary, the openings of the pressure reducing port 4 and the filtrate receiver 5 can be covered.

The mode of connection between the filtrate receiver and the filter medium support portion of such a conventional filter for liquid filtration was as shown in FIG.

That is, as shown in FIG. 5, the materials are fitted between the fitting inner wall 3a of the filter medium support part 3 and the fitting outer wall 5a of the filtrate receiver 5, and the structure maintains airtightness and fitting strength during handling. Therefore, there were drawbacks such as dislodgement during handling due to variations in the degree of fitting, difficulty in separation, and leakage of airtightness due to scraping of the fitting parts together due to repeated use.

The present invention was constructed to eliminate such drawbacks, and an example of its implementation is shown in Figures 1 to 3.
The example is shown in the figure.

That is, first, according to the present invention, an O-ring 9 is provided on the outer periphery of the diameter-reduced head 5a of the filtrate receiver 5. Thus, the downwardly extending annular collar 3a of the filter media support 3
When fitted to the inner wall of the filter, complete airtightness is maintained, and the filter support 3 and filtrate receiver 5 can be easily attached and detached.

Furthermore, in accordance with the present invention, a lock-type fitting mechanism is provided to secure the fitting between the inner wall of the annular collar 3a and the reduced diameter head 5a.

An example of this lock type fitting mechanism will be explained with reference to FIGS. 1 to 3. The lock type fitting mechanism in this embodiment includes a recess 7 extending in the circumferential direction on the lower inner surface of the annular collar 3a and convex portions 8 formed at equal intervals in the circumferential direction on the outer surface of the diameter-reducing head 5a. .

Therefore, the filter medium support section 3 and the filtrate receiver 5 are airtightly fitted to the lower end of the annular collar 3a in which the recess 7 is formed, and the relative position of the two in the circumferential direction is maintained. A notch 10 is formed corresponding to the arrangement of the protrusion 5 so that the protrusion 8 is brought to a position where it can be fitted into the recess 7 by rotation.

Since the lock-type fitting mechanism of the present invention has the above-mentioned configuration, the diameter-reducing head 5a is airtightly fitted to the inner wall of the annular collar 3a so that the protrusion 8 fits into the notch 10. Thereafter, by twisting the filter medium support part 3 in the circumferential direction, the convex part 8 fits into the concave part 7, thus exhibiting the function of preventing separation of the filter medium support part and the filtrate receiver during handling.

[Brief explanation of the drawing]

Figures 1 to 3 are explanatory diagrams showing embodiments of the present invention, Figure 4 is an explanatory diagram showing the overall structure of a conventional filter for liquid filtration, and Figure 5 is a diagram showing a conventional filter medium support and a filtrate receiver. It is an explanatory view showing a state of connection with a container. 1... Upper funnel, 2... Sheet filter medium,
3... Filter medium support part, 3a... Annular collar, 4...
Decompression port, 5...Filtrate receiver, 5a...Reducing head, 6
...Exit, 7...Concavity, 8...Protrusion, 9...O・
Ring, 10... Notch.

Claims (1)

[Scope of utility model registration request] an upper funnel 1 for the liquid to be filtered, a support 3 for sheet-like filter media tightly mounted in the bottom open annular wall 1a of the upper funnel, and an inner wall of an annular collar 3a extending below the support; In a filter consisting of a filtrate receiver 5 having a reduced diameter head 5a that fits together, the outer peripheral wall of the reduced diameter head 5a and the inner side of the annular collar 3a are connected to the outer peripheral wall of the reduced diameter head 5a in the fitted state. In addition to providing an O-ring to maintain a tight connection with the wall, a lock type fitting mechanism is provided to maintain a fixed fit between the inner wall of the annular collar 3a and the reduced diameter head 5a. Characteristic filter for liquid filtration.