JPH07213812A - Filter plate for filter press - Google Patents

Abstract

PURPOSE:To provide a filter plate for a filter press by which wrinkles of a filter cloth are prevented from advancing in the prescribed direction and prolonging the service life of the filter cloth than heretofore. CONSTITUTION:The direction of mesh of a net 7 spread on the surface of a platy core plate 1 consisting of stainless steel, etc., is made horizontal and vertical. In this way, there is no possibility of wrinkles of the filter cloth advancing in the direction of the filter cloth. Thus, the filter cloth has service life about ten times longer than the case that the net having mesh in the diagonal direction is spread.

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 A conventional filter plate for a filter press is
It is usual that a large number of filtration grooves are integrally formed on the surface of a cast or plastic core plate. Then, the filtrate filtered by the filter cloth brought into close contact with the surface of the core plate is taken out through the filtration grooves. However, such filter plates for filter press are
Since it is necessary to form a large number of filtration grooves on the surface of the core plate, there is a problem that the manufacturing cost is high.

Therefore, recently, a new filter plate for a filter press is 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 filtration groove. Is being developed. FIG. 3 shows such a filter press filter plate, 1 is a stainless steel core plate, 2 is a net attached to the surface of the filter plate, 3 is a core plate 1 from the upper side of the net 2.
It is a distance attached to. Distance 3
Has a role of keeping the distance between the filter plates constant during filtration.

This filter plate for filter press sandwiches a filter cloth 4 between them as shown in FIG. 3, and the stock solution is driven through a feed port 5 into a filter chamber formed between the filter cloths 4 and 4 for filtration. It is a thing. 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.

Wrinkles 6 extending radially from the feed port 5 are apt to be generated in the filter cloth 4 which is closely attached to the net 2 as shown in FIG. The wrinkles 6 of the filter cloth 4 are caused by the tension of the filter cloth 4 and the elongation of the filter cloth 4 of 1 to 3% due to the absorption of water. This wrinkle 6 has few dents as shown in FIG. 4 in the initial stage of using the filter cloth, and there is no problem because it is distributed almost evenly. However, after about 30 cycles have passed since the start of using the filter cloth, the wrinkles 6 become large on one side of the filter plate as shown in FIGS.
After about 2 months of use, the filter cloth 4 of the wrinkle 6 was sandwiched 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. That is, when a net having a cross mesh of 45 degrees with respect to the longitudinal direction is used, if the mesh of the net 2 is in the right oblique direction as shown in FIG. 5, large wrinkles 6 are formed in that direction. On the contrary, if the mesh direction of the net 2 is the diagonal left direction as shown in FIG. 6, large wrinkles 6 are formed in that direction. Although it is possible to prevent the occurrence of such wrinkles 6 by increasing the strength of the filter cloth 4, it is difficult to use it economically because it causes a significant cost increase as compared with a normal filter cloth. .

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and prevents large creases from being formed on one side of the filter plate even though a filter cloth of ordinary strength is used. The purpose of the present invention is to provide a filter plate for a filter press which is capable of preventing and significantly extending the service life of the filter cloth.

[0008]

The present invention, which has been made to solve the above problems, provides a filter press filter plate in which a net is attached to the surface of a flat core plate to form a filter groove. It is characterized in that the directions of the meshes are vertical and horizontal.

[0009]

In the filter plate for a filter press according to the present invention, since the meshes of the net attached to the surface of the core plate are in the vertical and horizontal directions, the wrinkles in the diagonal direction as in the conventional case may be developed in the filter cloth. Absent. For this reason, the filter cloth does not break due to wrinkles. Even if a filter cloth of normal strength is used, it has a service life of about 500 times (1 to 2 years), which is about 10 times that of the conventional one. It becomes possible.

[0010]

The present invention will be described in more detail below with reference to the embodiments shown in FIGS. In FIG. 1, 1 is a core plate made of stainless steel, 5 is a feed port for supplying undiluted solution, and 7 is a core plate 1.
The net 3 attached to the surface of the net 3 is a distance attached to the core plate 1 from the upper side of the net 7. The core plate 1 is made of, for example, SUS 304, and the peripheral edge 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.

As the net 7, a polyethylene net similar to the conventional one is used, but it is different from the conventional one in that the direction of the cross mesh is vertical and horizontal as shown in FIG. . The size of the mesh of net 7 is
It is about 5 to 15 mm, and if the mesh is smaller than 5 mm, the filtrate is difficult to flow, and if the mesh is larger than 15 mm, the filter cloth 4 comes into close contact with the core plate 1 inside, and thus the filtrate is difficult to flow. The material of the net 7 is not necessarily limited to polyethylene, and a resin material such as vinyl chloride, nylon, polypropylene PRP or the like having excellent corrosion resistance and abrasion resistance, or a metal material such as stainless steel may be used.

The filter cloth 4 shown in FIG. 2 is for carrying out filtration while being in close contact with the upper surface of the net 7.
It flows on the surface of the core plate 1 along the filtration grooves formed between the meshes and is taken out to the outside. However, as a result of the directions of the cross meshes of the net 7 being vertical and horizontal, as shown in FIG.
Even if the cycle is repeated, the wrinkles of a specific part do not progress. Therefore, the filter cloth 4 is not broken due to the 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. .

In the above embodiment, the single net 7 is attached to the stainless steel core plate 1, but different types 2 are used.
You can combine more than one type of net. In this case, by setting the mesh direction of the net 7 on the side in contact with the filter cloth 4 in the vertical and horizontal directions, the same effect as described above can be obtained.

[0014]

As described above, in the filter plate for a filter press of the present invention, the mesh of the net attached to the surface of the flat core plate is set to the vertical and horizontal directions so that the wrinkle of the filter cloth is not wrinkled. 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 significantly extended as compared with the conventional case. 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 drawings]

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

FIG. 2 is a front view showing an 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: After using the conventional filter plate for filter press 30
It is a partially notched perspective view which shows the state at the time of cycle progress.

[Fig. 6] After using the conventional filter plate for filter press 30
It is a partially notched perspective view which shows the state at the time of cycle progress.

[Explanation of symbols]

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

Claims (1)

[Claims] 1. A filter plate for a filter press in which a net is attached to the surface of a flat core plate to form a filtration groove, wherein the mesh directions of the net are vertical and horizontal. Filter plate.