JPH0333362B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a novel filter press, and particularly to a filter press that allows cloth to function as a pressing membrane without using a conventional pressing membrane.

[Prior art]

In general, filter presses that can perform filtering by squeezing action include squeezing a chamber formed between two cloths to squeeze out moisture from the undiluted solution or moisture-containing residue therein. A membrane or an equivalent member is provided. Conventional compressed membranes or members equivalent thereto are provided as a member separate from cloth, and are made of an elastic material such as rubber due to their functional characteristics.

[Problems to be solved by the invention]

By the way, the filter press configured as described above has a squeeze membrane made of a material other than cloth, so depending on the material of the squeeze membrane, the type of stock solution that can be used may vary. For example, in the case of compressed membranes made of materials such as rubber or plastic, the material requirements may be heat resistance, solvent resistance, acid resistance, ozone resistance, etc. There was a requirement to limit the undiluted solution. The present invention has been devised in view of the above problems and to effectively solve them. Therefore, the purpose is to eliminate the structure corresponding to the conventional squeeze membrane and to provide the cloth itself with a squeeze membrane function, thereby reducing the requirements for limiting the stock solution and creating a filter press that can increase the variety of stock solutions that can be used. It is about providing.

[Means to solve the problem]

The filter press according to the present invention has the following configuration in order to solve the problems of the prior art and achieve the objective. That is, the overbed portion is hollow and formed into a frame shape, and includes a plurality of plates arranged in a manner that they can be opened and closed, and when the plates are in the closed frame state, the plate is sandwiched between each of these plates. Each set of cloth is arranged between the plates so as to form a first chamber or a second chamber inside thereof, and the end surface of the plate on the side that holds the cloth forming the first chamber has the first
A first stock solution supply hole that communicates with the chamber is formed, and a second stock solution supply hole that communicates with the second chamber is formed on the end surface of the plate on the side that holds the cloth forming the second chamber. is provided with an expansion allowance so as to be able to press the cloth in a chamber adjacent to the chamber expanded by the supply of the stock solution, and supplies the stock solution to the first chamber through the first stock solution supply hole, and also controls the supply of the stock solution. A first supply system that can be stopped freely is provided, and a second supply system that supplies the stock solution to the second chamber through the second stock solution supply hole and that can stop the supply freely is provided.

[Function] According to the filter press according to the present invention, when performing the squeezing action, the stock solution is alternately supplied by the first supply system and the second supply system. When the stock solution is supplied to the first chamber, no stock solution is supplied to the second chamber, and conversely, when the stock solution is supplied to the second chamber, no stock solution is supplied to the first chamber.
The cloth forming the chamber to which the stock solution is supplied is expanded by the supply pressure of the stock solution. During this expansion, since the overbed part of the plate is hollow, the cloth presses against the cloth in the adjacent chamber and can further expand until it squeezes the chamber to which the supply of stock solution has been stopped. For example, when the first chamber and the second chamber are arranged alternately,
The chamber to be squeezed is subjected to squeezing action from both sides by the cloth of the chambers on both sides, and the first chamber and the second chamber are
When two chambers are arranged alternately, the chambers to be squeezed are lined up two by two, and each chamber is compressed from the opposite side by the cloth between the two chambers. Furthermore, if the width dimension of each chamber is reduced, it is also possible to alternately arrange the first chamber and the second chamber in groups of three or more. Rooms lined up 1
The first or second chambers of a group work together to exert a squeezing action on the adjacent chamber group. In this way, since the cloth itself functions as a squeezing membrane, the squeezing action can be performed without using a membrane member made of a material that was used only for squeezing purposes in the prior art.

【Effect of the invention】

As is clear from the above description, the present invention provides the following excellent effects. Since the squeezing action can be performed without using a membrane member made of a material that was used only for the purpose of squeezing in the prior art, there are fewer requirements to limit the type of stock solution.
The variety of stock solutions that can be used can be increased. Furthermore, the membrane members used in the prior art are very expensive, and if they can be reduced, it will greatly contribute to reducing the cost of the apparatus.

【Example】

A preferred embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a schematic diagram showing a schematic configuration of a first embodiment of a filter press according to the present invention, and for convenience of understanding, the frame is shown in a slightly open state.
In the first embodiment, the first chamber and the second chamber are alternately arranged one by one. In the figure, the chambers are numbered sequentially from the left _{side ,} . The cloth 2 forming each chamber 1 ₁ , 1 ₂ is
A set of two plates is arranged between each plate, and when each plate 3 is closed, it is sandwiched between these plates 3. On the other hand, the plate 3 is hollow in its overbed portion except for the plates 3 at both ends, and the cloth 2 is filled with liquid by supplying the stock solution into the chamber 1 ₁ or 1 ₂ formed inside the cloth 2. When the condition is reached, the cloth 2 expands as shown by the dashed line in the figure, and the cloth 2 comes into contact with the cloth 2 forming the chamber 1 ₁ or 1 ₂ adjacent to the chamber 1 ₁ or 1 ₂ in the liquid-filled condition. and press this.
An expansion allowance l is provided that is sufficient to compress this adjacent chamber 1 ₁ or 1 ₂ . In the figure, a first supply system ₄₁ that supplies the stock solution to the first chamber ₁₁ and a liquid discharge system 5 also supply the stock solution to the second chamber 11.
A second supply system ₄₂ that supplies the chamber ₁₂ and a liquid discharge system 5
are shown overlapping each other like a double pipe, but this is only a schematic illustration, and in reality they are each formed at the four corners of each roughly rectangular plate 3. A first stock solution supply hole 6 ₁ communicating with the first supply system 4 ₁ is provided on the end face of the plate 3 that sandwiches the cloth 2 forming the first chamber 1 ₁ , which holds the cloth 2 forming the second chamber 1 ₂ . On the end face of the plate 3, second stock solution supply holes 6 ₂ communicating with the second supply system 4 ₂ are formed at different positions. Liquid drainage system 5 shown above and below,
5 is simply separating one system into two,
Eventually they were merged. The first supply system 4 ₁ is provided with a first valve 7 ₁ , and the second supply system 4 ₂ is provided with a second valve 7 ₂ . Next, the operation of the above embodiment will be explained. In the first stage of operation, both the first and second valves 7 ₁ and 7 ₂ are opened and stock solution is supplied until all chambers are filled with liquid. After that, for example, only the first valve 7 ₁ is opened and the second valve 7 ₂ is closed. Therefore, the stock solution supply pressure is 1 ₁
The first chamber 1 ₁ expands by acting only on the first chamber 1 1 , and its cloth 2 comes into contact with the cloth 2 in the adjacent second chamber 1 ₂ and presses it further, thereby squeezing this second chamber 1 ₂ .
Therefore, in this state, filtration is performed in the first chamber 1 ₁ by the injection action of the stock solution, and filtration is performed in the second chamber 1 ₂ by the squeezing action. In addition, since the first chamber 1 ₁ is placed on both sides of the second chamber 1 ₂ ,
The squeezing action takes place from both sides of the squeezing chamber. After the stock solution is supplied to the first chamber ₁₁ for a certain period of time, the open/close states of the first valve ₇₁ and the second valve ₇₂ are switched, and the stock solution is then supplied to the second chamber ₁₂ . and the cloth 2 in the second chamber ₁ is the first
Chamber 1 Squeeze ₁ . Thereafter, similar valve switching continues. Furthermore, in the case of filtration by squeezing action, the filtration efficiency decreases rapidly when the water content in the residue falls below a certain amount, so that the flow rate of liquid discharged per unit time is drastically reduced. Therefore, if this timing is detected and the opening/closing states of the first valve 7 ₁ and the second valve 7 ₂ are switched, efficient operation can be performed. In addition, as another method for determining the switching timing, for example, the internal pressures of the first supply system 4 ₁ and the second supply system 4 ₂ are measured respectively.
The opening and closing states of the first valve 7 ₁ and the second valve 7 ₂ may be switched when the difference between the measured pressures exceeds a certain allowable value. In the above description of the operation of this embodiment, both the first and second valves 7 ₁ and 7 ₂ are opened at the initial stage of operation, but one valve 7 ₁ is opened from the beginning.
Alternatively, only ₇₂ may be opened and the chamber of that system first filled with liquid, and then the valves may be switched. FIG. 2 is a schematic diagram showing the schematic configuration of a second embodiment of the filter press according to the present invention, and FIG.
As in the figure, the frame is shown in a slightly open state.
In the second embodiment, two first chambers and two second chambers are alternately arranged. In this example as well, starting from the left,...
In the second embodiment, the chambers correspond to the first chamber ₁₁ , and the chambers correspond to the second chamber ₁₂ . The rest of the configuration is the same as that of the first embodiment, except that the first chamber 1
The first stock solution supply hole ₆₁ and the _second stock solution supply hole 61 formed in the plate 3 correspond to the change in the arrangement order of the first stock solution supply hole ₆₁ and the second chamber 12.
The arrangement of the stock solution supply hole ₆₂ has been changed. In the case of this example, the explanation is given using the example of four rooms, but this shows the basic pattern of arrangement order, and in reality, a large number of rooms that are multiples of 2 are formed and the number of rooms is four. 1st room 1 ₁ and 2nd room 1 ₂ is 2
The chambers are arranged alternately, and the squeezing action is performed from one side of each of the two compressed chambers that are opposite to each other. Therefore, it is preferable that only one chamber be disposed at both ends. In each of the above-mentioned embodiments, the cloth forming one chamber and the cloth forming the adjacent chamber may be in direct contact with each other, but in order to improve the liquid drainage, for example, a net-like structure is placed between them. Like the parts
It is also possible to insert a thin member between the cloths to ensure a space for the evaporated liquid to flow between the cloths. As described above, according to the filter press of this embodiment, it is possible to carry out filtering by the squeezing action without having to provide the squeezing membrane, which was conventionally provided exclusively for squeezing and was made of rubber or plastic material.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of a first embodiment of a filter press according to the present invention, and FIG. 2 is a schematic diagram showing a schematic configuration of a second embodiment of a filter press according to the present invention. 1 ₁ ... 1st room, 1 ₂ ... 2nd room, 2 ...
Cloth, 3... Board, 4 ₁ ... First supply system, 4 ₂ ... Second supply system, 6 ₁ ... First stock solution supply hole, 6 ₂ ... Second
Stock solution supply hole, l...expansion allowance.

Claims (1)

[Claims] 1. The overbed portion is hollow and formed into a frame shape,
It is equipped with a plurality of plates 3 arranged in a manner that they can be opened and closed, and when the plates 3 are in the closed frame state, the first chamber 1 ₁ or the second chamber 1 is sandwiched between each of these plates 3 and inside thereof. ₂ , each plate 3
Each set of cloth 2 is arranged between them, and the end face of the plate 3 on the side that sandwiches the cloth 2 forming the first chamber ₁₁ has a first stock solution supply hole communicating with the inside of the first chamber ₁₁ . 6 ₁ is formed, and a second stock solution supply hole 6 ₂ that communicates with the second chamber 1 ₂ is formed on the end surface of the plate 3 on the side that holds the cloth 2 forming the second chamber 1 ₂ . The cloth 2 is given an expansion margin l so that it can press the cloth 2 in the chamber 1 ₁ or 1 ₂ adjacent to the chamber 1 ₁ or 1 ₂ that has expanded due to the supply of the stock solution, and the first stock solution supply hole 6 ₁ is provided with a first supply system 4 ₁ that can supply the stock solution to the first chamber 1 ₁ and _freely stop the supply _; A filter press characterized in that it is equipped with a second supply system ₄₂ that can supply a stock solution to the tank and freely stop the supply. 2. The filter press according to claim 1, wherein the first chamber 1 ₁ and the second chamber 1 ₂ are alternately arranged one by one. 3. The filter press according to claim 1, wherein two of the first chambers 1 ₁ and _two of the second chambers 1 2 are arranged alternately. 4. The scope of claims in which the switching timing of the stock solution supply in the first supply system 4 ₁ and the second supply system 4 ₂ is determined according to the rate of change in the liquid discharge flow rate from the chamber in which the stock solution supply is stopped. The filter press according to any one of Items 1 to 3. 5 The switching timing of the stock solution supply in the first supply system 4 ₁ and the second supply system 4 ₂ is set to the differential pressure between the system internal pressure of the system where the stock solution supply is stopped and the system pressure of the system that is supplying the stock solution. A filter press according to any one of claims 1 to 3, to be determined accordingly.