JPH0461682B2 - - 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 There is a problem in that when the liquid is expanded by compressed air, abnormal expansion occurs around the stock solution hole. 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 Utility Model 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 is provided which is adapted to control excessive bulging of the bulge.
However, in such a device, although it is possible to limit the rapid curved expansion 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 it is still insufficient in terms of durability. It is not completely satisfactory, and there are some difficulties in balancing the squeezing pressure with respect to the stock solution. Furthermore, since the edge of the reinforcing ring protrudes outward from the filter cloth surface, a portion of the cake after squeezing accumulates on the environmental step between the reinforcing ring and the filter cloth, and is deposited on the filter cloth surface of each filter plate. Even if the filter cloth is vibrated to remove the adhered cake, the vibration is difficult to be transmitted to the boundary between the reinforcing ring and the filter cloth.

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. At the same time, 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 the boundary step between the reinforcing ring and the flexible plate can be expanded. To provide a compression type filter press that does not cause cake accumulation and can evenly apply vibration to the front surface of a filter cloth for removing cake.

Composition of the Invention The compression type filter press according to the present invention is provided with a flexible plate provided with a filtration surface having a thickness smaller than that of the frame on the inner side of a rigid frame-like frame, and the flexible plate A plurality of compressed filter plates each having a rigid plate integrally formed with the frame and a regular filter plate each having a filtration surface having a thickness smaller than that of the outer frame are arranged alternately. In what becomes
The flexible plate itself in the area surrounding the stock solution hole is a thick ring-shaped part, and the ring-shaped part has a thickness comparable to that of the frame, and the cross-sectional shape of the inner peripheral part is approximately V. The filter cloth is formed in a shape of a letter or a letter U, and a filter cloth is coated on the flexible plate from the inner peripheral surface of the ring-shaped part along the surface of the flexible plate, and around the stock solution hole of the ordinary filter plate, Raised portions are arranged radially around the stock solution holes, and the raised portions are formed to protrude in the thickness direction of the ordinary filter plate to the same extent as the frame of the ordinary filter plate, and have a substantially trapezoidal cross-sectional shape. It is said that
The ordinary filter plate is characterized in that a filter cloth is coated from the inner peripheral surface of the stock solution hole along the filtering surface. Further, the diameter of the circular outer periphery centered on the stock solution hole of the raised portion of the ordinary filter plate is configured to be slightly larger than the outer diameter of the ring-shaped portion of the compressed filter plate.

Embodiments Hereinafter, embodiments of the present invention will be described in more detail based on drawings showing embodiments of the present invention. A press filter plate 4 is formed by fitting and holding a flexible plate 3 made of a rubber material and having a filter surface 2 on both sides with a thickness smaller than the thickness of the frame 1, and a filter plate 4 made of a metal or hard material. 1 to 3 show the main parts of a compressing type filter press which is alternately arranged with ordinary filter plates 7 made of plastic and having a filtration surface 6 having a thickness smaller than that of the outer frame part 5. As shown in FIG. The inner periphery of the filter plate 4 is formed into a ring-shaped portion 9 having a thickness larger than 2 and having a cross-sectional shape of the inner periphery as the stock solution hole 8 that tapers gently into a V-shape or a U-shape. A plate-like flange portion 10 is formed on the frame, and a filter cloth 11 is covered from the surface of the frame-like frame 1 to the surface of the flexible plate 3 to constitute the compressed filter plate 4. Stock solution hole 8
around the filter plate 7 protrudes in the thickness direction of the filter plate 7 to a thickness equal to or slightly smaller than the thickness of the frame portion 5 of the filter plate 7,
A plurality of raised portions 14 each having a roughly trapezoidal cross section and having a gentle slope 12 and a flat top 13 are formed at intervals in the circumferential direction of the stock solution hole 8, and extend from the inner peripheral surface of the stock solution hole 8 to the filtration surface 6. A filter cloth 11 is covered along the filter plate 7 to form an ordinary filter plate 7, and a large number of compressed filter plates 4 and ordinary filter plates 7 are arranged alternately to form a filter press.

A slight gap S is formed between the side surface of the ring-shaped portion 9 and the flat top portion 13 of the radially arranged raised portions 14 of the ordinary filter plate 7 when both filter plates 9 are pressed against each other. . . In the figure, 16 is a pressure fluid introduction pipe, 17 is a filtrate discharge path, and 18, 18 are filtrate guides arranged on the surface of the flexible plate 3 and the surface of the ordinary filter plate 7, which communicate with the discharge path 17. The groove 19 is a groove formed between the above-mentioned raised portions 14, 14, so that most of the stock solution fed into the stock solution hole 8 flows into the filter chamber 20 through this groove 19. It's summery.
It goes without saying that the shape and arrangement of the filtrate guide grooves 18, 18 are arbitrary.

FIG. 4 shows another embodiment of the compressed filter plate 4.

In the compressed filter plate 4, which includes a rigid plate 21 that is integrally formed with the frame 1 and extends inward, and flexible plates 3 are arranged on both sides of the frame 1 and the rigid plate 21, the undiluted solution of the rigid plate 21 is The inner peripheral end of the hole is wrapped by the inner peripheral part of the flexible plate 3, and the inner peripheral part of the flexible plate 3 has a V-shaped or U-shaped cross section with a thickness corresponding to the ring part 9 described above. A thick link-like part 9 is formed by the flexible plate 3 itself, and both sides of the flexible plate 3 from the surface of the ring-shaped part 9 are covered with filter cloth 11 to form the compressed filter plate 4. The figure shows how it was done. In addition, the filter cloths 11, 11 are the compressed filter plate 4 and the ordinary filter plate 7.
However, as shown in FIG. , 6, the filter surfaces 2, 6
It is preferable to cover the compressed filter plate 4 while maintaining a slight gap _S1 , so that the flexible plate 3
The expansion of the filter creates freedom, and in the case of a normal filter plate 7, it helps the filter cloth to fit along the filtrate water guide groove 18 without any force, and also helps the filter cloth 1 to be removed from the cake.
When vibration is applied to 1, the vibration is caused by the ring-shaped part 9
It has the advantage of being effectively transmitted to the surface of the

Note that the top surface 13 of the raised portion 14 of the ordinary filter plate 7
Although the figure shows an aspect in which the top surface is horizontally elongated in the circumferential direction, the top surface may be elongated in the circumferential direction.
In any case, the top surface of this raised portion 14 is the slope 1
2 and 12 to prevent damage to the filter cloth 11.

When pressurized fluid is supplied to the compressed filter plate 4, the filtration surface 2 of the flexible plate 3 is suppressed from swelling on the liquid solution hole 8 side, as shown by the broken line in FIG. Both sides are bulged out substantially in parallel, and the filter dregs in the filter chamber 20 can be compressed almost evenly toward the normal filter plate 7 side, thereby achieving effective dewatering.

Moreover, the filter cloth 11 covers the entire filter plate from the inner peripheral surface of the compressed filter plate 4 and the ordinary filter plate 7, and the filter cloth 11 is not fixed on the inner peripheral side as in the conventional case. No local excessive tension is applied to the filter cloth 11, and the life of the filter cloth 11 can be greatly extended.

Furthermore, the vibration of the filter cloth 11 applied when peeling off the residual cake after dehydration spreads to the entire filter cloth, making it possible to efficiently remove the deposits on the filter cloth surface.

A plurality of raised portions 1 provided on the ordinary filter plate 7
4 regulates the position of the filter cloth 11 on the pressing filter plate 4 side, and also serves to prevent it from digging into the filtered water guide groove 18 formed on the filtering surface 6 of the ordinary filter plate 7.

Effects of the Invention As detailed above, according to the present invention, various excellent effects as listed below can be obtained, the durability of the flexible plate is achieved, and the squeezing pressure on the stock solution is equalized. To provide a squeezing type filter press in which vibration for removing the cake can be applied uniformly to the entire surface of the filter cloth without the cake after squeezing being deposited on the boundary step between the supply ring and the filter cloth. I can do it.

(1) The flexible plate of the press filter plate has a thick ring-shaped part around the stock solution hole, and the ring-shaped part has a thickness similar to that of the frame and a cross-section of the inner peripheral part. The shape is approximately V-shaped or U-shaped, and on the other hand, around the stock solution hole of the ordinary filter plate,
Raised portions are arranged radially around the stock solution hole, and the raised portions are formed to protrude in the thickness direction of the ordinary filter plate to the same extent as the frame of the ordinary filter plate, and have a substantially trapezoidal cross-sectional shape. Therefore, when pressurized fluid is supplied to the squeeze filter plate, the filtration surface of the flexible plate is bulged out substantially parallel to both sides by suppressing the bulge on the stock solution hole side, and the filtration surface is bulged out substantially parallel to both sides. The filter dregs in the room are compressed almost evenly toward the normal filter plate side, and effective dewatering can be accomplished.

(2) A filter cloth is coated from the inner peripheral surface of the ring-shaped part of the flexible plate along the surface of the flexible plate, and a filter cloth is coated from the inner peripheral surface of the stock solution hole of the ordinary filter plate along the filtering surface. Because these filter cloths are covered with The service 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 regulates the position of the filter cloth on the squeeze filter plate side, and has many practical effects such as helping to prevent the filtrate from digging into the filtrate guide formed on the filtration surface of the ordinary filter plate. do.

(5) Since the ring-shaped portion of the flexible plate is formed integrally with the flexible plate, it is easy to handle, and the ring-shaped portion does not move due to pressure fluid even during operation of the filter press. Its position is always stable and effective dehydration can be achieved in this respect as well.

Further, since the ring-shaped portion is integrated with the flexible plate, the ring-shaped portion also functions as a reinforcing portion of this portion of the flexible plate, and the life of the flexible plate is long.

Furthermore, by integrally molding the ring-shaped portion with the flexible plate, the overall manufacturing cost is reduced.

[Brief explanation of drawings]

The drawings illustrate embodiments of the invention,
Fig. 1 is a partially omitted cross-sectional view showing the superposition state of the compressed filter plate and the ordinary filter plate, Figures 2 and 3 are side views of the stock solution supply portion of the compressed filter plate and the ordinary filter plate, respectively, and Fig. 4 5 is a partially omitted cross-sectional view showing another embodiment of the compressed filter plate, and FIG. 5 is a partially omitted cross-sectional view showing the expanded state of the flexible plate of the compressed filter plate. 1...Frame body, 2...Filtering surface, 3...Flexible plate, 4
... Pressing filter plate, 5 ... Frame part, 6 ... Filtering surface, 7
... Ordinary filter plate, 8 ... Stock solution hole, 9 ... Ring member, 9' ... Ring-shaped part, 10 ... Flange part,
11... Filter cloth, 14... Raised portion.

Claims (1)

[Scope of Claims] 1. A flexible plate having a filtration surface having a thickness smaller than that of the frame is provided on the inner side of a rigid frame-like frame, and the frame is provided inside the flexible plate. A press filter plate provided with a rigid plate formed integrally with the body and a plurality of ordinary filter plates each provided with a filter surface having a thickness smaller than the outer frame portion are arranged alternately. , the flexible plate itself in the surrounding area of the stock solution hole is a thick ring-shaped part, the ring-shaped part has a thickness comparable to that of the frame, and the cross-sectional shape of the inner peripheral part is approximately It is formed in a V-shape or a U-shape, and a filter cloth is coated on the flexible plate from the inner peripheral surface of the ring-shaped part along the surface of the flexible plate, and the area around the stock solution hole of the ordinary filter plate is covered with a filter cloth. The raised portions are arranged radially around the stock solution hole, and the raised portions are formed to protrude in the thickness direction of the ordinary filter plate to the same extent as the frame of the ordinary filter plate, and have a cross-sectional shape. A compression type filter press, characterized in that the ordinary filter plate has a substantially trapezoidal shape and is covered with a filter cloth from the inner circumferential surface of the stock solution hole to the filtering surface.