JPH0431725B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a compressing type filter press for dehydrating a stock solution by compressing and filtering the stock solution.

Prior Art and its Problems In general, when compressing and filtering a stock solution using a compressing filter press, the filtration efficiency and processing capacity vary significantly depending on the magnitude of the compressing pressure, or whether it is balanced or unbalanced. On the other hand, in a filter press that alternately arranges pressed filter plates and ordinary filter plates formed by a rigid frame-shaped main body and a flexible material that expands with compressed air, the above-mentioned flexible material is An abnormal bulge may occur near the stock solution hole, causing damage.
Alternatively, there is a problem that the next supply of the stock solution becomes unsmooth. For this reason, for example, a reinforcing ring is fitted into the solution hole of the flexible member to prevent the flexible member from bulging toward the solution hole. However, in this case, the flexible material suddenly bends and bulges from the edge of the reinforcing ring, resulting in the inconvenience of being easily damaged from the portion located at the tightening edge of the reinforcing ring. are doing. In order to improve this inconvenience, for example, as seen in Japanese Patent Publication No. 58-35727, an auxiliary ring is provided in the stock solution hole of the ordinary filter plate installed oppositely, and a flexible material is A device has been provided which is designed to suppress excessive bulge. However, in such a device, although it is possible to limit the sudden bulge of the flexible material, the phenomenon that the flexible material bulges out in a spindle shape from the outer periphery of the reinforcing ring is unavoidable, and this reduces durability. It is still not completely satisfactory, and there are some difficulties in balancing the squeezing pressure with respect to the raw solution.Furthermore, the edge of the reinforcing ring protrudes outward from the filter cloth surface, so the cake after squeezing is difficult to maintain. Even if the filter cloth is vibrated to remove the cake that has accumulated on the boundary step between the reinforcing ring and the filter cloth and adhered to the filter cloth surface of each filter plate, the vibration will cause the reinforcement ring and the filter cloth to fall off. It has the disadvantage that it is difficult to transmit to the boundary area.

Purpose of the Invention The present invention was made for the purpose of improving the above-mentioned difficulties and drawbacks of the conventional compression type filter press, and prevents excessive expansion of the filter cloth and flexible plate on the compression filter plate side. The flexible plate and the filter cloth can be expanded substantially parallel to the filtration surface of the compressed filter plate when compressed pressure is applied, and a cake can be formed at the boundary step between the reinforcing ring and the flexible plate. To provide a compression type filter press in which there is no accumulation of cake, and furthermore, vibration for removing cake can be applied uniformly to the entire surface of the filter cloth.

Composition of the Invention The compression type filter press according to the present invention includes a compression filter plate provided with a flexible plate forming a filtration surface smaller in thickness than the frame inside a rigid frame-like frame, and a frame on the outer periphery. In a compression type filter press that is made up of alternating regular filter plates with a filtration surface that is thinner than the filter plate, a plurality of raised parts are formed on the sides of the stock solution holes of only the normal filter plates. They are formed in a radial arrangement and protrude in the thickness direction of the ordinary filter plate, and the side surfaces around the stock solution holes of the squeeze filter plate are formed close to the raised portions, and each of the press filter plate and the ordinary filter plate It is characterized in that the filter cloth covers the entire surface of the stock solution hole from the inner periphery to both sides thereof.

Embodiments The following Figures 1 and 2 show embodiments of the present invention.
To explain the figure in detail, it is equipped with a rectangular or circular frame-like frame 1 made of metal or hard plastic, and on the inside part of the frame 1,
A compressed filter plate 4 comprising a flexible plate 3 made of a rubber material and provided with a filtration surface 2 having a thickness smaller than that of the frame 1; and an outer frame portion 5 made entirely of metal or hard plastic. In the compression type filter press, a large number of ordinary filter plates 7 each having a filtration surface 6 having a thickness smaller than that of the ordinary filter plate 7 are arranged alternately. A plurality of raised portions 9, 9 protruding in the thickness direction of the filter plate 7 are formed in a radial arrangement from the center, and the flat top surfaces 10, 10 are formed around the stock solution holes 8 of the adjacent squeeze filter plate 4. The respective raised portions 9, 9 should be close to the side surfaces of the
While forming stock solution entrance grooves 11, 11 between them,
The compressed filter plate 4 and the ordinary filter plate 7 have a structure in which the entire surfaces from the inner surface to both sides are covered with filter cloths 12, 12.
In the figure, 12', 12' are joints along the inner periphery of the stock solution hole of the filter cloth.

In this embodiment, the above-mentioned compressed filter plate 4 is constructed by covering the surface of a rigid core plate 13 with a flexible plate 3 made of a rubber material, and when pressure fluid is introduced from a pressure fluid inlet 14, The thin-walled portions on both sides bulge outward to compress the stock solution in the filter chamber 15. The inner periphery 16 of the stock solution hole 8 of the flexible plate 3 is thickened and has a U-shaped cross section, and is fitted tightly into the inner periphery of the core plate 13 and reinforced with an arcuate cross section on the inner periphery. Although the ring 17 is shown fitted, the structure of the pressing filter plate 4 is not particularly limited. In the figure, reference numeral 18 denotes a filtrate outlet that communicates with filtrate guide grooves (not shown) formed on the filter surfaces 2, 6 of the filter plates 4, 7.

Figure 3 shows the raised portions 9, 9 of the ordinary filter plate 7 mentioned above.
The filter plate 7 is formed separately and fixed to the filter plate 7 with set screws 19, 19. According to this configuration, the raised portions 9, 9 having different heights and sizes
By preparing this, you can create a filter press that is suitable for the quality and concentration of the stock solution.
Further, by removing the raised portions 9, 9, an effect such as being able to be used as a normal filter plate can be obtained.

The shapes of the raised portions 9, 9 provided on the side surfaces around the stock solution holes of the filter plate 7 do not need to be specified;
A trapezoid with a flat top surface is preferable, and when four to six raised portions 9, 9 are provided at equal intervals, they are located on the lower half circumference side of the filter plate as shown in FIG. It is advantageous for the cake to be discharged if the flat surfaces 20, 20 of the raised portions 9, 9 are slightly reduced in size.

When pressure fluid is supplied to the compressed filter plate 4, the flexible plate 3
is the raised part 9 around the stock solution hole 8 of the normal filter plate 7,
9, the expansion is suppressed and the expansion is made substantially parallel to the filtration surface, thereby compressing the stock solution in the filter chamber 15 almost evenly toward the normal filter plate 7 side, resulting in an effective It can perform dehydration action.

Furthermore, the filter cloth 12 covers the entire surface of the filter plate from the inner peripheral surface of the stock solution hole to the compressed filter plate 4 and the ordinary filter plate 7, and is not fastened and fixed by the edge of the ring as in the conventional case. , local excessive tension does not act on the filter cloth 12, and the life of the filter cloth 12 can be significantly extended.

Furthermore, after dehydration, the vibration applied to the filter cloth 12 when peeling off the residual cake spreads to the entire filter cloth, and the deposits on the filter cloth surface can be efficiently removed.

Effects of the Invention As detailed above, according to the present invention, various excellent effects as listed below can be obtained, and excessive swelling of the filter cloth and flexible plate on the pressing filter plate side can be prevented. At the same time, the flexible plate and filter cloth can be expanded substantially parallel to the filtration surface of the compressed filter plate when compressed pressure is applied, and the boundary step between the reinforcing ring and the flexible plate can be expanded. It is possible to provide a compression type filter press that does not cause cake buildup and can evenly apply vibrations to remove cake over the entire surface of the filter cloth.

(1) A plurality of raised portions are formed on the side surface of the liquid solution hole of the ordinary filter plate in a radial arrangement of the liquid liquid hole and protrude in the thickness direction of the ordinary filter plate, while on the side surface of the liquid liquid hole of the press filter plate Since the surrounding side surface is formed to be close to the raised portion, when pressurized fluid is supplied to the squeeze filter plate, the flexible plate normally moves due to the presence of the raised portion around the stock solution hole of the filter plate. The bulge is suppressed and bulges out substantially parallel to the filtration surface, thereby compressing the stock solution in the filtration chamber almost evenly toward the normal filter plate and achieving effective dehydration. can.

(2) Since each of the compressed filter plate and the ordinary filter plate is coated with a filter cloth covering the entire surface from the inner periphery of the stock solution hole to both sides, these two filter cloths cannot be used for compressed filtration as in the past. The filter cloth is not fixed on the inner circumferential side of the plate and the ordinary filter plate, so that excessive local tension is not applied to the filter cloth, and the life of the filter cloth can be greatly extended.

(3) Also, as mentioned above, since the filter cloth is not fixed on the inner peripheral side of the pressed filter plate and the ordinary filter plate, the vibration of the filter cloth applied when peeling off the residual cake after dehydration is This spreads to the entire cloth, and the matter adhering to the filter cloth surface can be efficiently removed.

(4) Since raised parts are arranged radially around the stock solution hole in the normal filter plate,
The presence of the raised portion has many practical effects such as regulating the position of the filter cloth on the squeeze filter plate side and preventing the filtered water from digging into the filtrate guide groove formed on the filtration surface of the ordinary filter plate. demonstrate.

[Brief explanation of drawings]

The drawings illustrate embodiments of the invention,
1 and 2 are a partially omitted sectional view and a partially cutaway front view of the stock solution hole portion showing an embodiment in which a raised portion is provided on a normal filter plate, and FIGS. 3 and 4 show other embodiments. FIG. 2 is a partially omitted sectional view and a partially cutaway front view. 1... Frame body, 2... Filtration surface, 3... Flexible plate, 4... Press filter plate, 5... Frame part, 6... Filtration surface, 7... Ordinary filter plate,
8... Stock solution hole, 9... Raised portion, 12... Filter cloth.

Claims (1)

[Scope of Claims] 1. A compressed filter plate comprising a flexible plate forming a filtration surface with a thickness smaller than that of the frame inside a rigid frame-like frame, and a filter plate having a thickness smaller than that of the outer frame portion. In a compression type filter press consisting of regular filter plates and ordinary filter plates each having a small filtration surface arranged alternately, a plurality of raised portions are arranged radially around the concentrate holes on the side surface of only the ordinary filter plate around the concentrate holes. and is formed to protrude in the thickness direction of the ordinary filter plate, and the side surface around the stock solution hole of the squeeze filter plate is formed to be close to the raised portion, and a filter cloth is provided on each of the press filter plate and the ordinary filter plate. A compression type filter press characterized in that the liquid solution hole is coated from the inner periphery to the entire surface of both sides.