JP2824199B2 - Filter plate for filter press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter plate for a filter press which prevents damage to a filter cloth.

[0002]

2. Description of the Related Art Conventionally, a filter plate for a general filter press is composed of:
Usually, a large number of filtration grooves are integrally formed on the surface of a casting or plastic core plate. Then, the filtrate is filtered by the filter cloth adhered to the surface of the core plate, and is taken out through the filtration grooves to the outside. However, such filter plates for filter press are
Since it is necessary to form a very large number of filtration grooves on the surface of the core plate, there is a problem that the production cost is high.

In recent years, a new filter plate for a filter press has been used in which a flat plate made of stainless steel or the like is used as a core plate, and a net made of polyethylene resin is attached to the surface of the core plate to form a gap between meshes of the net as a filter groove. Is being developed. FIG. 3 shows such a filter plate for a filter press, wherein 1 is a core plate made of stainless steel, 2 is a net attached to the surface thereof, and 3 is a core plate 1 from the upper side of the net 2.
It is a distance attached to. Distance 3
Has the role of keeping the distance between the filter plates constant during filtration.

In this filter press filter plate, as shown in FIG. 3, a filter cloth 4 is sandwiched between the filter cloths, and an undiluted solution is driven from a feed port 5 into a filter chamber formed between the filter cloths 4 to perform filtration. Things. Then, the filtrate is taken out to the outside through a filtration groove formed between the core plate 1 and the filter cloth 4 by the net 2.

As shown in FIG. 4, wrinkles 6 radially extending from the feed port 5 are likely to be formed on the filter cloth 4 which is in close contact with the net 2. The wrinkles 6 of the filter cloth 4 are generated due to an elongation of the filter cloth 4 of 1 to 3% due to a tension at the time of filtration or water absorption. The wrinkles 6 have no problem at the beginning of use of the filter cloth, as shown in FIG. However, after about 30 cycles have elapsed since the start of use of the filter cloth, the wrinkles 6 became large on one side of the filter plate as shown in FIG. 5 and FIG.
When the filter cloth 4 at the wrinkle 6 was used, the filter cloth 4 was torn between the distances 3 and the filter cloth 4 was torn, often requiring replacement of the filter cloth.

The cause is considered to be as follows. In other words, when a net having a cross mesh of 45 degrees with respect to the longitudinal direction is used, a large wrinkle 6 is formed in the direction of the net 2 if the direction of the mesh is diagonally right as shown in FIG. Conversely, if the direction of the mesh of the net 2 is oblique to the left as shown in FIG. 6, a large wrinkle 6 is formed in that direction. Although it is conceivable to prevent the occurrence of such wrinkles 6 by increasing the strength of the filter cloth 4, it is difficult to employ the filter cloth 4 because the cost is greatly increased as compared with a normal filter cloth. .

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and solves the problem that large wrinkles are formed in the filter cloth on one side of the filter plate despite using a filter cloth of normal strength. The object of the present invention is to provide a filter plate for a filter press which can prevent the filter cloth from being used and greatly extend the service life of the filter cloth.

[0008]

The present invention has been made to solve the above problems BRIEF SUMMARY OF THE INVENTION is affixed the net to form a filtered grooves on the surface of the flat core plates, the distance between the filter plates mutual thereon
In a filter plate for a press having a distance for keeping the filter constant, the direction of the mesh of the net is vertical and horizontal.

[0009]

In the filter plate for a filter press of the present invention, since the direction of the mesh of the net attached to the surface of the core plate is set to the vertical and horizontal directions, wrinkles in the diagonal direction as in the prior art can progress in the filter cloth. Absent. For this reason, the filter cloth is not broken due to wrinkles, so that even if a filter cloth of normal strength is used, the service life of about 500 cycles (about 1 to 2 years), which is about 10 times that of the conventional filter cloth, is provided. It becomes possible.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the embodiments shown in FIGS. In FIG. 1, 1 is a stainless steel core plate, 5 is a feed port for supplying a stock solution, and 7 is a core plate 1.
The reference numeral 3 denotes a distance attached to the core plate 1 from above the net 7. The core plate 1 is made of, for example, SUS 304, and the peripheral portion 1a has a thickness of 50 to 60 mm, while the inner portion 1b has a uniform thickness of about 5 to 30 mm. The material of the core plate 1 is not necessarily limited to stainless steel.

The net 7 is made of the same polyethylene net as the conventional one, but differs from the conventional one in that the direction of the cross mesh is vertical and horizontal as shown in FIG. . The size of the net 7 is
When the mesh is smaller than 5 mm, the filtrate does not easily flow. When the mesh is larger than 15 mm, the filter cloth 4 adheres tightly to the core plate 1 inside the mesh, so that the filtrate also hardly flows. The material of the net 7 is not necessarily limited to polyethylene, but may be a resin material such as vinyl chloride, nylon, or polypropylene PRP having excellent corrosion resistance and abrasion resistance, or a metal material such as stainless steel.

[0012] filter cloth 4 shown in FIG. 2, like FIG. 3 Ne
Filtration is performed in a state in which the filter is in close contact with the upper surfaces of the cut 7 and the distance 3 , and flows on the surface of the core plate 1 along a filtration groove formed between meshes of the net 7, and is taken out. However, as a result of setting the direction of the cross mesh of the net 7 in the vertical and horizontal directions, as shown in FIG. 2, only small wrinkles 8 are uniformly entered as a whole, and wrinkles of a specific portion progress even if the cycle is repeated. Never. Therefore, the filter cloth 4 is not broken due to wrinkles as in the conventional case, and the filter cloth 4 can have a service life of about 500 cycles (1 to 2 years) which requires replacement due to clogging. .

Although the single net 7 is attached to the stainless steel core plate 1 in the above embodiment, two different types of nets 7 are used.
You can also combine more than one type of net. In this case, the same operation and effect as described above can be obtained by setting the direction of the mesh of the net 7 on the side in contact with the filter cloth 4 to the vertical and horizontal directions.

[0014]

As described above, the filter plate for a filter press of the present invention has a net that is attached to the surface of a flat core plate in a vertical and horizontal direction, whereby the wrinkles of the filter cloth are reduced. There is an advantage that the filter cloth can be prevented from proceeding in a specific direction, and the service life of the filter cloth can be greatly extended as compared with the related art. Further, the filter plate for a filter press of the present invention is economically excellent because it is not necessary to use an expensive filter cloth having high strength in order to extend the service life.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the present invention.

FIG. 2 is a front view showing the embodiment of the present invention.

FIG. 3 is a partially cutaway perspective view showing a conventional filter plate for a filter press.

FIG. 4 is a partially cutaway perspective view showing a state at the start of use of a conventional filter plate for a filter press.

[Fig. 5] 30 days after starting use of the conventional filter plate for filter press
FIG. 5 is a partially cutaway perspective view showing a state after a cycle has elapsed.

[Fig. 6] 30 days after starting use of the conventional filter plate for filter press
FIG. 5 is a partially cutaway perspective view showing a state after a cycle has elapsed.

[Explanation of symbols]

1 core plate, 2 conventional nets, 3 distance, 4
Filter cloth, 5 feed port, 6 wrinkles of conventional example, net of 7 examples, wrinkle of 8 examples

Claims (1)

(57) [Claims] 1. A filtering groove is formed by attaching a net to the surface of a flat core plate, and the distance between the filter plates is made constant from above.
A filter plate for a filter press, to which a distance for maintaining the filter is attached , wherein the mesh direction of the net is vertical and horizontal.