JPH0248007Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a filtration device that filters an undiluted solution by passing it through a main body with a built-in filter element. It is used to remove certain solid matter such as garbage and earth from the soil.

(Prior Art) Conventionally, as this type of filtration device, there are those shown in FIGS. 5 and 6. The one in Figure 5 is the main body a
In contrast, the filter element b shown in FIG. 6 is provided with a plate-shaped filter element d whose cross section is curved and convex toward the outlet c side.

(Problems to be solved by the invention) The filter element b in Fig. 5 is flat and easy to manufacture and easy to install in the main body a, but the inlet e
When the raw liquid f flowing into the main body a collides with the filter element b as shown by the arrow in the figure, the central part of the flow passes straight through the filter element b, while the surrounding part passes through the filter element b. It bounces off the surface and causes a vortex, which causes pressure loss. The filter element shown in FIG. 6 has a larger filtration area than the flat filter element b shown in FIG. 5 because the filter element d is curved. However, the stock solution f flowing into the main body a from the inlet e
is the filter element d as shown by the arrow in the figure.
When the filter element d collides with the filter element d, the portion that does not pass through the filter element d is reflected from each part of the filter element d toward the center of curvature of the filter element d. For this reason, the rebound flow of the stock solution f concentrates in a columnar shape at the center of curvature, forming a strongly swirling columnar concentration area h, which does not collapse, and strongly prevents the stock solution from smoothly flowing in and passing through the filter element d, resulting in a large leading to pressure loss. Furthermore, the central portion of the filter element d, which is the main filtration portion, is likely to be clogged with solid foreign matter.

In addition, when the stock solution f flows into the wide main body a from the narrow inlet e, the diameter of the inflow area does not expand even if it becomes smaller due to the peeling and diameter reduction phenomenon, and only a small portion of the filter element d passes through. The effective filtration area is extremely small, and the filtration resistance increases accordingly, resulting in pressure loss, and the filtration function tends to deteriorate early.

(Means for Solving the Problems) In order to solve the above problems, the present invention has a filter element built in between the inlet part of the main body for introducing the stock solution and the outlet part for discharging the filtrate. is formed to have a convex curved shape toward the inlet side, and on both side edges of the filter element,
It is characterized by having a bent edge toward the entrance side.

The filter element may also have edges bent back toward the inlet portion on both side edges thereof.

(Function) The stock solution flowing into the main body from the inlet collides with the convex curved surface of the filter element, and passes through a wide area of the filter element while branching and expanding left and right along the convex curved surface, reducing the effective filtration area. can be increased. The flow of the undiluted solution that is branched and expanded on the convex curved surface of the filter element also exerts a self-cleaning action that sweeps away solid foreign matter from the main filtration action section in the center of the filter element to the left and right sides. In addition, the stock solution that does not pass through the filter element and is repelled is dispersed within the main body in a radial direction from the center of curvature of the filter element.
The rebounding flow of the stock solution can alleviate the obstruction of the stock solution flowing smoothly and passing through the filter element.

Since the bending edge is located so as to cross the direction of the diversion of the concentrated liquid that is divided to the left and right along the convex curved surface, the concentrated liquid can smoothly pass through the filter element even if the flow rate decreases. can.

(Embodiment) To explain the embodiment of the present invention shown in FIGS. 1 to 4, the main body 1 is a pressure vessel whose upper end is sealed with a lid 2, and one side is partitioned by a plate-shaped filter element 3. One chamber is provided with an inlet 4 for introducing the stock solution, and the other chamber is provided with an outlet 5 for discharging the filtrate.

The filter element 3 has a cross section formed in a curved shape convex toward the inlet 4 side, and has edges 3a bent back toward the inlet 4 side at both edges.

The stock solution 6 that has entered the main body 1 from the inlet 4 collides with the convex curved surface of the filter element 3, as shown by the arrow in FIG. Then, it becomes a filtrate 7 and flows out from the outlet 5.

The stock solution 6 that does not pass through the filter element 3 is repelled in the radial direction from the center of curvature of the filter element 3 and expands into the main body 1, and the force is weak, so the stock solution 6 smoothly flows into the main body 1 and passes through the filter element 3. Doesn't obstruct passage too much.

As a result, the effective filtration area increases and the pressure loss decreases.

The stock solution 6 that collides with the convex curved surface of the filter element 3 and is branched and expanded collides again with the bent edge 3a from a direction almost perpendicular to it at the right and left relief parts of the filter element 3, as shown in FIGS. 1 and 3. As a result, it can pass smoothly through the bent edge 3a, which helps improve filtration efficiency.

On the convex curved surface of the filter element 3, solid foreign matter 6a separated from the stock solution 6 tends to adhere and accumulate as shown in FIG. Since the flow of the stock solution 6 is occurring, there is a self-cleaning action that sweeps away the solid foreign matter 6a that adheres and is about to accumulate to the left and right portions of the filter element 3 as shown in Fig. 4, and a large amount of the stock solution 6 passes through and filtration is completed. It is possible to prevent the solid foreign matter 6a from accumulating and clogging in the active portion, and to stabilize the filtration function over a long period of time.

(Effects of the invention) According to the invention, since it has the above-described structure and operation, pressure loss can be reduced by simply improving the shape and orientation of the filter element, and the effective filtration area of the filter element can be increased. Due to the self-cleaning action, the filtration function is stable over a long period of time, which is advantageous in terms of energy saving and maintenance.

Further, according to the present invention, the stock solution can be passed smoothly over substantially the entire surface of the filter element including the left and right side edges, and the filtration efficiency can be further improved.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing an embodiment of the present invention;
The figure is a partially cutaway perspective view, Figures 3 and 4 are cross-sectional views of the filter element showing the filtering state, and Figures 5 and 6 are cross-sectional views showing different conventional examples. It is. 1...Main body, 3...Filter element, 3a
...Bending edge, 4...Entrance, 5...Exit.

Claims (1)

[Scope of utility model registration request] A filter element is built in between the inlet part of the main body for introducing the stock solution and the outlet part for discharging the filtrate, and the cross section is formed to have a curved shape convex toward the inlet part, and both side edges of the filter element A filtration device characterized in that the section is provided with a bent edge toward the inlet section.