JPH0356243Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a filter press.

[Conventional technology]

As is well known, in conventional filter presses, a plurality of filter disks are installed in parallel in a machine frame, and after the filter cloth is interposed between the filter disks and the liquid is compressed, the liquid to be treated is passed into a filter chamber formed inside the filter cloth. This is a filtration device that performs filtration by press-fitting into the filter. Such a filter press has the great advantage that the filtration area can be freely adjusted by increasing or decreasing the number of filter disks, and a large filtration area can be easily obtained.

[Problem that the invention attempts to solve]

However, while the above-mentioned conventional filter press has these advantages, the filtration efficiency is low, the water content of the cake after filtration is large and post-treatment is labor-intensive, and it is difficult to peel the cake from the filter cloth. It has problems such as being difficult.

[Means for solving problems]

The present invention, as a means to solve the problems of the conventional filter press, includes a machine frame 1, a plurality of filter discs 5 slidably arranged in parallel in the machine frame 1, and a plurality of filter discs 5. A filter cloth 31 which is sandwiched between and forms a filter chamber 31A therein, a liquid guide passage 8 which is formed in communication with the filter chamber 31A, a press-fit pipe 13 which directly communicates with the liquid guide passage 8, and A precoat liquid discharge pipe 15, a communication pipe 25 that connects the press-in pipe 13 and the precoat tank 17, a filtrate discharge pipe 18 that communicates with the filter chamber 31A via a filter cloth 31, and the plurality of filter disks. The present invention provides a filter press consisting of 5 pressing means.

[Effect]

Since the present invention has the above-mentioned configuration, when precoating is performed, the precoat liquid in the precoat tank 17 is filled into the filter chamber 31A from the press-in pipe 13 via the communication pipe 25, but at this time, the precoat liquid from the precoat liquid discharge pipe 15 By discharging the liquid, pressure is prevented from building up within the filter chamber 31A. After that, when the pre-coat liquid discharge pipe 15 is closed, pressure is applied to the inside of the filter chamber 31A for the first time, and when the pre-coat liquid is filtered in this way, the surface of the filter cloth 31 is pre-coated with the filter aid, and then the liquid to be treated is press-fitted from the press-in pipe 13. and perform the filtration step.

[Effect of idea]

Therefore, in the present invention, since no pressure is generated in the filter chamber when filling the precoat liquid, the precoat liquid is distributed throughout the filter chamber, and the precoat liquid is stirred by circulation to uniformly disperse the filter aid. In this way, the filter cloth can be uniformly pre-coated with the filter aid, thus improving the filtration efficiency and reducing the moisture content of the cake in the filtration process. Since it is attached to the surface of the filter cloth, it can be easily peeled off from the surface of the filter cloth. Note that if precoating is performed, fine filtration can be performed even if a coarse filter cloth is used, so that clogging of the filter cloth is less likely to occur, and the filtration efficiency is improved in this respect as well.

〔Example〕

To explain the present invention with reference to an embodiment shown in the drawings, reference numeral 1 denotes a machine frame, and a pair of front and rear side frames 2, 2 and It consists of rails 4, 4 extending on both sides of the side frames 2, 2. Reference numeral 5 denotes a filter disk having numerous protrusions 6 formed on its surface, with a communication hole 8A for the precoat liquid provided in the upper part, and a filtrate discharge hole 10 provided through the guide hole 9 in the lower part. Furthermore, the arm portion 1 is attached to the filter disk 5 from both sides.
1 is held out, rollers 12 are rotatably attached to the arm portions 11, and as the rollers 12 ride on the rails 4 of the machine frame 1, the plurality of filter disks 5 slide on the machine frame 1. They are arranged in parallel so that they can move freely. The plurality of filter disks 5 are sandwiched between a front plate 5A and a rear plate 5B, and the front plate 5A is provided with a filtrate discharge hole 10A, and the rear plate 5 is provided with a filtrate discharge hole 10A.
A communication hole 8B for precoat liquid is provided in the upper part of B. That is, the communication hole 8A of the filter plate 5 and the rear plate 5B
A liquid guide passage 8 is formed by the communication hole 8B. The front plate 5A is fixed to the side frame 2, but the rear plate 5
Like the filter disk 5, B is slidably supported by the machine frame 1. Reference numeral 13 denotes a press-in tube for the liquid to be treated, in which a valve 13A and a pump 14 are interposed, and the communication hole 8A and the communication hole 8B of the rear plate 5B are connected through the communication hole 7A of the front plate 5A.
It faces and directly communicates with the liquid guide passage 8 consisting of. 15 is a precoat liquid discharge pipe with a valve 16 interposed therebetween, which communicates with the precoat tank 17; 18 is a filtrate discharge pipe with a valve 19 interposed therebetween, which connects to the filtrate discharge hole 10A of the front plate 5A and the filtrate discharge hole 10 of the filter plate 5. 20 is a pre-coated filtrate discharge pipe, and a valve 20A is interposed to connect the filtrate discharge pipe 18.
It is branched from and connected to pre-coat tank 17,
Reference numeral 21 is a recovery pipe, and a valve 22 is interposed between the press-in pipe 1
3, which is branched from the press-fitting pipe 13, and 23 is an air conduction pipe with a valve 24 interposed therebetween, and is branched from the press-fit pipe 13, and 25 is a communication pipe with a valve 26 interposed between the pre-coat tank 17 and the pump 14. Communicate with the suction side. A hydraulic cylinder 27 is attached to the side frame 2 of the machine frame 1, and is supplied with pressure oil by a pump 28, and operates the filter disk 5 between the front plate 5A and the rear plate 5B by means of a piston rod 29. Tighten. A cake receiving tank 30 is arranged directly below the filter disk 5.

In the above configuration, the filter cloth 31 is brought into contact with both sides of the filter disk 5, and then the filter disk 5 is compressed by the hydraulic cylinder 27, so that the filter cloth 31 is interposed between the filter disks 5. The filter cloth 31 has communication holes 32 corresponding to the filter disks 5.
and a filtrate discharge hole 34 are provided. Furthermore, filter cloth 3
A hollow flange bolt 37 is inserted through the communication hole 32 of 1 and the communication hole 8A of the filter disk 5, and a flange nut 38 is screwed onto the tip of the bolt 37. Contacting filter cloth 3
1 is provided with a communication hole 32 and a filtrate discharge hole 34,
The communication hole 32 of the filter cloth 31 and the communication hole 7A of the front plate 5A
by inserting hollow flange bolts 37. In this way, the filter cloth 31 is fixed to one side of the front plate 5A, both sides of the filter plate 5, and one side of the rear plate 5B, thereby forming a filter chamber 31A inside. Prior to the filtration step, first, the precoat liquid (mixture of the liquid to be treated and the filter aid of diatomaceous earth and bentonite liquid) in the precoat tank 17 is pumped through the press-in pipe 13 through the communication pipe 25 by the pump 14 by opening the valve 26. It is introduced into the filter chamber 31A through the filter chamber 31A. Then, the air in the filter chamber 31A is transferred from the filter chamber 31A to the precoat liquid discharge pipe 1 as the precoat liquid is introduced into the filter chamber 31A.
Eliminated via 5. At this time, the valve 13A of the press-fit tube 13 is kept closed. The precoat liquid introduced into the filter chamber 31A spreads into the filter chamber 31A via the communication hole 7A, and the precoat liquid passage 8 consisting of the communication holes 8A and 8B, and eventually flows from the precoat liquid discharge pipe 15 to the precoat tank 17. As described above, the air is returned while taking the air inside the filter chamber 31A with it. As the precoat liquid is circulated in this way, it is agitated and the filter aid is uniformly dispersed in the precoat liquid. At this point, when the valve 16 of the precoat liquid discharge pipe 15 is gradually closed, the precoat in the filter chamber 31A is removed. Injection pressure is now applied to the liquid, the pre-coat liquid is filtered by the filter cloth 31, the filter aid such as diatomaceous earth forms a pre-coat film on the filter cloth, and the filtrate passes through the conduit hole 9 and the filtrate discharge hole. 1
0 to the filtrate discharge pipe 18, and returns to the precoat tank 17 from the precoat filtrate discharge pipe 20 when the valve 20A is opened. In this way, the precoat is evenly spread over the surface of the filter cloth 31. Next, if the valve 26 of the communication pipe 25 is closed and the valve 13A of the press-in pipe 13 is opened, the liquid to be treated will be pressurized into the filtration chamber 31A, and if the valve 16 of the pre-coat liquid discharge pipe 15 is further closed, the liquid to be treated will be discharged. is filtered by the filter aid and filter cloth 31 in the filter chamber 31A, and the filtrate reaches the filtrate discharge pipe 18 from the filtrate discharge hole 10 via the guide hole 9, and is discharged by opening the valve 19. At this time, the valve 20A of the precoat filtrate discharge pipe 20 is closed. When the filtration is finished, stop the pump 14,
The valve 22 of the recovery pipe 21 is opened to collect the liquid remaining in the filter chamber 31A into the pre-coat tank 17, the valve 22 is closed and the valve 24 of the air passage pipe 23 is opened, and compressed air is introduced through the press-in pipe 13. The liquid in the cake accumulated between the filter cloths 31 and the liquid in the filtrate discharge pipe 18 are recovered. In this way, the hydraulic cylinder 27 is moved backward, the pressure on the filter disk 5 is released via the rear plate 5B, the filter disk 5 is opened, and the cake accumulated in the filter cloth 30 is collected into the receiving tank 17.

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention.
The figure is a cutaway side view of the main part, Figure 2 is a sectional view taken along line A-A' in Figure 1, Figure 3 is a front view of the filter cloth fixed to the filter disk, and Figure 4 is the line B-- in Figure 3.
B′ cross-sectional view. In the diagram: 1... Machine frame, 5... Filtration plate, 13... Press-fit pipe (pre-coat pipe), 15... Pre-coat liquid discharge pipe, 17... Pre-coat tank, 18... Filtrate discharge pipe, 25... Connection pipe , 31...filter cloth, 31A
...Filter chamber.

Claims (1)

[Scope of utility model registration request] A machine frame, a plurality of filter disks slidably arranged in parallel within the machine frame, a filter cloth sandwiched between the plurality of filter disks and forming a filter chamber therein, and communicating with the filter chamber. a press-fitting pipe and a pre-coat liquid discharge pipe that face and directly communicate with the liquid-guiding passage; a communication pipe that connects the press-fit pipe and the pre-coat tank;
a filtrate discharge pipe communicating with the filter chamber via a filter cloth;
A filter press comprising means for clamping the plurality of filter disks.