JPS5841087B2 - Squeezing plate of squeezing type filter press - Google Patents

Description

[Detailed description of the invention] The present invention relates to a pressing plate for a pressing type filter press.

The compression plate of the compression type filter press is a core plate covered with a flexible sheet, and the squeezed fluid is guided from the core plate side to the back of the flexible sheet, and the flexible sheet expands to make the undiluted solution stronger. It's a lot to pass by.

The flexible sheet is usually fixed to the core plate by tightening bolts at the peripheral edge of the core plate, but there is a drawback that the compressed fluid leaks from between the core plate and the flexible sheet during compression.

To address this drawback, a technique as shown in FIG. 1 has been proposed.

That is, the flexible sheet C is attached to the core plate opening in which the compressed fluid passage A is formed, and a fitting groove 2 is formed on the surface of the core plate opening, and in this groove 2, the compressed fluid passage I is formed. Let some water flow through.

On the other hand, a fitting convex portion is formed on the inner surface of the flexible sheet C to correspond to the fitting concave groove 2, and a U-groove is formed in the central portion thereof.

When the flexible sheet is attached, the fitting convex portion is fitted into the fitting concave groove 2, so that the compressed fluid can flow into the U groove into the fitting convex portion when compressed. It is pushed outward from the inside and presses the fitting convex portion into the fitting groove 2 to ensure airtightness.

However, with this prior art, it is necessary to perform special processing on the core plate opening to form a fitting groove and a communicating hole.
The flexible sheet is also specially formed with a fitting convex portion, and the U
There are major problems in terms of production and cost, as groove treatment must be performed and existing core plates and flexible sheets cannot be used. Also, the seal area is too large to fit with the mating groove 2. Only the contact part to the convex part is narrow and flexible.
This method has drawbacks such as troublesome fitting work when attaching the sea lion.

The object of the present invention is to provide a pressing plate for a pressing type filter press that eliminates the drawbacks of the conventional examples as described above.

An embodiment will be described with reference to FIGS. 2 to 9. In FIG. 2, 1 is a core plate of a pressing plate, 2 is a flexible sheet, and 3 is a p-cloth.

13 is a stock solution hole.

Although this example shows a center-feed type pressing plate in which the stock solution hole 13 is provided in the center of the pressing plate, the same applies to pressing plates with other feeding methods.

In addition, although the flexible sheet 2 shown in FIG. 2 has continuous solution holes 13, as shown in FIG. The flexible sheet 2 is connected to the coupling ring 5 fitted through the member 4.
The protrusions may be fitted together.

6 is banking.

The core plate 1 has a peripheral portion with a thick frame portion 1a, and a central portion 1 with a thick frame portion 1a.
A tapered portion 1c is formed between the tapered portion and b.

The flexible sheet 2 is attached along the core plate 1, and is fixedly tightened by a tightening bolt 7 near the end of the frame portion 1a.

Reference numeral 8 denotes a bag-shaped notch according to the present invention, which is formed in the inner wall surface of the flexible sheet 2 so that its opening 8a opens.

FIG. 4 is an enlarged view of the vicinity of the notch 8 in FIG. 2.

In this example, the opening 8a of the notch 8 is located at the frame portion 1 of the core plate 1.
They are provided so as to face each other on the front and back sides of a.

The notch 8 is formed in such a position that the inner part 8b is positioned further toward the outer circumferential direction of the flexible sheet 2 with respect to the opening 8a, and the opening 8a is positioned with respect to the inner surface of the flexible sheet 2. The opening 8a is formed continuously from the opening 8a so that the deep part 8b is parallel to the inner surface of the flexible sheet 2 or forms a shallow angle.

The cut portion 8 is formed by the compressed fluid entering the portion 8 and causing the flexible sheet 2
Considering the function of pressing the core plate 1, it is preferable that the opening 8a be parallel to the flexible sheet 2, but in order to prevent the notch 8 from being blocked, the opening 8a is formed at a deep angle. At the same time, it is sloped so as to smoothly continue from the opening 8a.

Note that the flexible sheet 2 has a core plate 1 formed in a rectangular, circular, etc.
Since the cut portion 8 is also attached to the flexible sheet 2
It is designed to be placed around the inside.

FIG. 5 shows an example in which the position of the notch 8 is changed.

That is, in this example, the opening 8a of the notch 8 is located at the boundary between the frame portion 1a and the tapered portion 1c of the core plate 1.

In other respects, this embodiment is the same as the embodiment shown in FIG. 4.

The embodiment shown in FIG. 6 has double notches 8,
One of them is provided so that the opening 8a is located at the boundary between the frame portion 1a and the tapered portion 1c of the core plate 1, and the other is provided so that the opening 8a faces the frame portion 1a.

Note that 2a are folds formed on the surface of the flexible sheet 2.

Further, the above-mentioned cleaning cloth 3 is not necessary when the pressing plate only squeezes the undiluted solution and does not itself perform filtration.

In this case, the pleats 2a are also unnecessary.

Next, to explain the operation, in a state in which the door plates and pressing plates of a filter press consisting of a combination of an ordinary door plate and a pressed plate, a normal door plate and a pressed door plate, a combination of pressed door plates, etc., or a door frame, the door plates and pressing plates are superposed. When the compressed fluid is introduced from the outside through the core plate 1 and between the core plate 1 and the flexible sheet 2,
The flexible sheet 2 swells as shown by the imaginary line in FIG.
is formed between the flexible sheet 2 and the core plate 1.

The compressed fluid in the compressed fluid chamber 9 tends to leak out through the space between the flexible sheet 2 and the frame portion 1a of the core plate 1 due to the pressure.

In the case of the example shown in FIG. 4, in the compressed state, as shown in FIG. to prevent leakage.

Since the notch 8 is provided in the middle, the liquid flows into the notch 8 side and is prevented from leaking to the outside.

Furthermore, as a second step, when the amount of flow into the notch 8 is small, the pressure inside the notch 8 increases, and as a result, the pressure inside the notch 8 increases.
The side meat part 2b of the frame is strongly pressed against the frame part 1a to prevent leakage.

In the case of the example shown in FIG. 5, since the opening 8a of the notch 8 is located at the boundary between the frame portion 1a and the tapered portion 1c, in the compressed state, as shown in FIG. Fluid chamber 9
The fluid flows relatively easily into the notch 8 through the opening 8a.

That is, in the case of this embodiment, unlike the examples shown in FIGS. 4 and 7, in which leaking liquid is received, a part of the compressed fluid in the compressed fluid chamber 9 is utilized and the leaked liquid is received. This is to ensure watertightness.

In FIG. 8, the pressure inside the notch 8 increases due to the inflow of the compressed fluid, and this causes the side wall portion 2b of the notch 8 to increase.
is pressed against the frame portion 1a to ensure water-tightness.

In the case of the example shown in FIG. 6, the compressed state becomes as shown in FIG. 9.

That is, among the double-formed notches 8.8, the inner notch 8 has the same function as that described in FIG. 8 during compression, and utilizes the inflow of compressed fluid. This is to actively ensure watertightness.

On the other hand, the notch 8 on the outer circumferential side has the same function as that explained in FIG. 8. When the internal pressure increases, the side wall portion 2b is pressed against the frame portion 1a to further improve watertightness.

In this way, in this embodiment, the notches 8 are arranged in two stages to ensure leakage prevention.

Incidentally, as shown in FIG. 10, it is also possible to form a structure in which a groove 11 formed in the flexible sheet 2 and a valve membrane 12 correspond to the cut portion 8.

The present invention has the above configuration, and the peripheral edge fastening portion of the flexible sheet attached to the core plate has an opening on the inner surface of the flexible sheet facing the surface of the core plate and a direction along the inner surface. Since a notch is provided, liquid that is about to leak to the outside through the space between the core plate and the flexible sheet is received into the notch and prevented from leaking, or the liquid is prevented from flowing into the notch. The increase in internal pressure caused by the liquid can press the flexible sheet against the core plate to prevent leakage.

Since the water leakage prevention structure is provided with a notch in the flexible sheet, by appropriately setting the length of the notch, the width of the pressure can be made wider than that of conventional ones.
A watertight effect can be ensured.

In addition, in terms of manufacturing and cost, since only the cut portions are provided in the flexible sheet, it is much more advantageous in terms of manufacturing and cost than the manufacturing of conventional flexible sheets.

And the core plate does not require any special processing.

Further, there is no need to pay special attention to the attachment of the core plate and the flexible sheet as in the conventional example.

Furthermore, the present invention has the advantage that the conventionally used core plate can be used as is, and the flexible sheet used in the present invention can be easily manufactured using a conventionally used flexible sheet.

In summary, according to the present invention, it is possible to improve the watertight effect of the pressing plate, and the configuration thereof is easy to manufacture, easy to assemble, and can be carried out at a low cost.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of the main part of a pressing plate showing the conventional technology, FIG. 2 is a vertical sectional view of the main part of the pressing plate showing an embodiment of the present invention, and FIG. 3 is a undiluted solution hole in the pressing plate of the embodiment. 4 is a partially enlarged sectional view of FIG. 2, and FIGS. 5 and 6 are cross-sectional views showing other examples.
The figures are longitudinal cross-sectional views of main parts of pressing plates showing other embodiments, and the first
8 and 9 are longitudinal cross-sectional views of the main parts of the pressing plate in the compressed state corresponding to FIGS. 4, 5, and 6, respectively, and FIG.
The figure is a vertical cross-sectional view of a main part of a pressing plate showing another embodiment. 1... Core plate, 1a... Frame part, 1b... Center part,
1c... Part of the taper, 2... Flexible sheet, 8...
Notch, 8a... Opening of the notch, 9... Compressed fluid chamber.

Claims (1)

[Scope of Claims] 1. A flexible sheet attached to the core plate has an opening on the inner surface of the flexible sheet facing the core plate surface and extends in the direction along the inner rod at the peripheral edge fastening portion of the flexible sheet to the core plate. A compression plate for a compression type filter press, characterized in that it is provided with a formed notch. 2. The pressing plate of the pressing type filter press according to claim 1, wherein the cut portion opens in the frame portion of the core plate. 3. The compression plate of the compression type filter press according to claim 1, wherein the notch opens at the boundary between the frame part of the core plate and the tapered part extending from the frame part to the center part. 4. Claim 1, in which the notches are opened in the frame portion of the core plate and in the boundary between the frame portion of the core plate and the tapered portion extending from the frame portion to the central portion. A compression plate of the compression type filter press described in Section 1.