JPH0445806A - Filter - Google Patents

Abstract

PURPOSE:To obtain a clear filtrate without leaving a raw liq. in a casing by providing a filtrate discharge pipe to each of the filter plates horizontally arranged in the casing in plural stages. CONSTITUTION:At least one filter plate 15 is vertically arranged in plural stages in a closed casing 14 having a raw liq. feed port 35 and a compressed air feed port 36 at its upper part. A filter plate 19 is arranged to cover the open part of the filter plate 15. A filtrate discharge pipe 22 is communicated with a space formed by the filter plates 15 and 19 and opened to the outside. One filtrate discharge pipe 22 is provided to one filter plate 15. Consequently, a clear filtrate is obtained without leaving the raw liq. in the casing. In addition, since the liq. remaining in the casing can rapidly be coped with, the raw liqs. can be switched in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial Application Field The present invention relates to an apparatus for filtering an introduced stock solution without suspending it until the end.

(2) Prior Art Conventionally, a device as shown in FIG. 1 or 2 is known, which filters an undiluted solution by laminating a filter aid such as diatomaceous material on the filtration surface.

First, in the apparatus shown in FIG. 1, filter plates 2 are arranged horizontally and in multiple stages in a casing 1, and the upper filter plates 23 to 2b are connected to filtrate pipes 3.
Therefore, a device is known in which the filter plate 2C at the lowermost end discharges the filtrate from the filtrate pipe 4.

In addition, the filtrate shown in FIG.
This is a device that collects filtrate from.

(3) Problems to be Solved by the Invention However, in the conventional device described above, when filtering the stock solution remaining in the casing at the final stage of the filtration operation, high-pressure air is supplied into the casing to dispose of the remaining amount of stock solution. However, in the former case, the filtrate pipe 3 is closed when the uppermost filter plate 2a comes into contact with air, and filtration is performed only by the lowermost filter plate 2C. The reason why such an operation is performed is that when air passes through the filter plate 2, that is, the filter aid, the liquid content in the filter decreases, that is, the volume contracts, which causes cracks in the filter aid and makes the filtrate cloudy. be.

In the latter case, filtration is similarly performed through a filter installed at the lowest end of the filter. Therefore, at the stage of supplying high-pressure air, the burden of filtering all the stock solution in the filter is placed on the lowermost filter plate 2c in the former case and the filter in the latter case, resulting in a long filtration time and inefficiency.

Particularly in recent years, emphasis has been placed on the production of a wide variety of products in small quantities, and how to efficiently treat residual liquid has become an important issue in filtration operations.

In view of the current situation, as a result of intensive research, the inventor of the present application has arranged the filter plates horizontally, provided each filter plate with a filtrate discharge pipe that independently leads the filtrate, and as the stock solution decreases in the filter, The present invention was completed based on the knowledge that if the valves of the filtrate discharge pipe are sequentially closed, the stock solution remaining in the filter can be efficiently treated.

That is, the present invention provides a sealed casing having an undiluted solution supply port and a pressurized air supply port in the upper part, at least one filter plate arranged horizontally in multiple stages within the casing, and covering the open part of the filter plate. It consists of a filtrate plate arranged in the same way, and a filtrate discharge pipe that communicates with the space formed by the filter plate and the filtrate plate and opens to the outside, and the filtrate plate and the filtrate discharge pipe correspond one to one. This filter is characterized by being installed as follows.

(4) Specific means for solving the problem First, in FIG.
1 and the bottom plate 13 form a sealed casing 14.

Inside the casing 14, filter plates 15 having a dish shape and forming a filtration surface are installed horizontally in multiple stages at certain intervals, and the filter plates 15 are supported by columnar supports provided on the outer periphery inside the casing 14. It is supported by member 16. In the filter plate 15, the upper filter plates 15a, 15b,
15 c is supported by the support member 16,
The lowest filter plate 15d is placed on the bottom plate 13 of the casing 14.

Plate-shaped ribs 18 are radially arranged in the recess 17 of the filter plate 15, and a filter plate 19 made of a perforated plate, wire mesh, or the like is laid on the upper surface of the rib 18 to cover the recess 17.
The recess 17 forms a space 20, and the filter plate 1
The upper surface of 5 is coated with a filter aid 21.

A filtrate discharge pipe 22 penetrating the bottom plate 13 and opening to the outside communicates with the space 20 of the filter plate 15, and is independently piped to each filter plate 15 as shown in FIG. There is. Therefore, the filtrate dropped into the space 20 through the filter aid 21 and the filtrate plate 19 is guided to the outside through the respective filtrate discharge pipes 22a, bc, and d.

Note that among the filter plates 15, the upper filter plates 15a, 15b, 1
A hole 26 is bored in the center of 5c, through which a cleaning device 27 fixed to the ceiling 12 of the casing 14 moves up and down.

The cleaning device 27 includes a cleaning pipe 28 fixed to the casing 14 and extending to the outside and communicating with a water pressure source, and a chain pipe 28.
The cleaning ball 30 is installed at the tip of the filter and has a plurality of nozzles 29 separated by 4 feet, and the cleaning ball 30 is installed directly above the lowest filter plate 15d.

As shown in FIG. 5, valves 32a, b, and cd are provided in communication with the filtrate discharge pipe 22, respectively.
In particular, the filtrate discharge pipe 22 communicates with the lowest filter plate 15d.
d, a bypass filter 33 is installed via a valve 34. This filter 33 is for treating the undiluted liquid remaining as a residual liquid in the filtrate discharge pipe 22d or the filter plate 15d, and in this application, since this residual liquid is extremely small, it may be provided as necessary.

On the other hand, a stock solution supply port 35 for the stock solution to be filtered and a pressurized air supply port 36 for filtering the stock solution remaining in the casing 14 are installed in the ceiling portion 12 of the casing 14 .

A vibration device 37 is installed on the bottom plate 13 of the casing 14, and is a device for removing the filter aid 21 that has absorbed impurities from the stock solution from the filter plate 15 after filtration.

40 is a filter slag receptacle provided in an annular shape on the frame 39 that supports the bottom plate 13 or the casing 14;
When the filter aid 21 is moved to the filter, the filter aid 21 is discharged into the slag receiver 40 by the action of the vibrating device 37.

Further, liquid level sensors 41ab, c, and d for detecting the liquid level of the stock solution in the casing 13 are provided at positions corresponding to each of the filter plates 15 on the outer peripheral portion of the casing 14, as shown in FIG. Valve 32 is controller 42
It opens and closes in response to a signal from the sensor 41 via the sensor 41. Note that valves 32d, 34 are installed in communication with the filtrate discharge pipe 22d.
are configured to operate independently.

The present invention is constructed as described above. First, a stock solution to which a filter aid has been added is introduced into the casing 14 from the stock solution supply port 35, and the filter aid is applied to the entire upper surface of the filtrate plate 15 by normal means. is coated. Next, when the stock solution is supplied, impurities in the stock solution are blocked by the filter aid 21, and only the filtrate passes through the filter aid 21 and the filtrate plate 19 and drips into the four parts 17. The filtrate dropped into the fourth part 17 is guided to the outside through the filtrate discharge pipe 22 and collected.

After supplying a specified amount of the stock solution, the supply is stopped, and then, in order to dispose of the remaining liquid in the casing 14, high pressure air is added from the pressurized air supply port 30 to apply pressure to the remaining liquid.

Due to this pressure, the stock solution is filtered and the liquid level gradually decreases,
When the liquid level drops to the upper surface of the filter aid 21 of the uppermost filter plate 15a, the liquid level is detected by the corresponding liquid level sensor 41a and the valve 32a is closed. Thereafter, similar operations are continued up to the lowest filter plate 15d, and thereafter the valves 32d and 34 are switched to pass through the filter 33 as described above.

Then, the residual liquid in the filter aid 21 is pushed out with high pressure air, the moisture content of the filter aid 21 is reduced to 60% or less, and the filtration process is completed.After the filtration process is completed, the main body 11 is first moved upward, and then the vibrator is turned on. It is operated to remove the filter aid 21, that is, the filter slag from the filter plate 15. Then, the main body 11, that is, the cleaning device 27 is moved up and down to clean the filter plate 15.

Next, FIG. 6 shows another embodiment. In this embodiment, the cleaning device 2
In this example, step 7 is omitted, and after the casing 14 is moved upward to remove the filter dregs, the filter plate 15 is cleaned manually.

Further, FIG. 7 shows another embodiment. This embodiment is an example in which the filter plate 15 is formed into a ring shape, covered with filtrate plates 19 from above and below to form a space 20, and the space 20 is communicated with a filtrate discharge pipe 22. The area can be doubled.

(5) Effects of the Invention The present invention is constructed as described above, and since filtrate discharge pipes are provided on each side of the filter plate, a clear filtrate can be obtained without leaving any undiluted solution in the casing. Furthermore, since the remaining liquid in the casing can be dealt with quickly, switching of the stock liquid can be done in a short time.

[Brief explanation of the drawing]

1 and 2 are front sectional views of the conventional device, FIG. 3 is a front sectional view of the filter according to the present application, FIG. 4 is an enlarged view of the filter plate, FIG. 5 is a control flow sheet diagram, and FIG. Figures 6 and 7 show other embodiments, respectively. In the drawings, 11 is the main body, 14 is the casing, and 15 is the main body.
is a filter plate, 16 is a support member, 19 is a filtrate plate, 22 is a filtrate discharge pipe, 23 is a valve, 27 is a cleaning device, 83 is a filter, 35 is a stock solution supply port, 36 is a pressurized air supply port, 41
indicates the liquid level sensor.

Claims (1)

[Claims] A sealed casing having a stock solution supply port and a pressurized air supply port at the top, at least one filter plate arranged horizontally in multiple stages within the casing, and a filtrate arranged so as to cover the open part of the filter plate. It consists of a plate and a filtrate discharge pipe that communicates with the space formed by the filter plate and the filtrate plate and opens to the outside, and the filter plate and the filtrate discharge pipe are installed in a one-to-one correspondence. A filter machine featuring