JPH0326086B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an improvement in the structure of a filtration unit of a filter press, and more specifically, a filtrate collection member separate from the frame is provided within a frame sandwiched between filter cloths. The present invention relates to a filtration unit comprising:

BACKGROUND ART Conventionally, filter plates of filter presses having various structures have been known. For example, as shown in FIG. 11, the filter plate main body of the filter plate has a square frame portion 2
A filter bed surface 20b is integrally formed within 0a, and a large number of recesses 20c are formed on both sides of the filter bed 20b.
..., 20c.

Problems to be Solved by the Invention However, in the structure described above, since the filter bed is formed within the frame, the entire filter plate itself is quite heavy, making it inconvenient to handle and making it difficult to move the filter plate. However, there was a problem in that a large driving force was required, which increased various costs for the filter press as a whole.

Therefore, the inventor thought that if the filter bed inside the frame could be removed, the weight of the filter plate body could be made even lighter, and decided to analyze the function of this filter bed.
In other words, first of all, the reason why the filter bed is formed into a planar shape inside the frame is that if there was no filter bed, if there was a pressure difference between the two sides of the filter bed when the stock solution was being injected, the filter cloth would shift from the high pressure side to the low pressure side. is pressed and forced to move,
This is believed to be because the stock solution cannot be smoothly injected into the filter chamber formed between the pair of filter cloths sandwiched between adjacent filter plate bodies, and there is a possibility that smooth filtration cannot be performed. In addition, the reason for forming the recesses on the surface of the filter bed is that depending on the properties of the stock solution, the supply pressure of the stock solution, the material of the filter cloth, etc., the filter cloths placed on both sides of the pair of frames may be Contact may occur due to the pressure of the stock solution, and in such cases, the filtrate that has passed through one filter cloth does not flow down to the bottom of the frame, but instead passes through the other filter cloth and enters the cake in the filter chamber. Since there is a risk of a situation in which the filtrate cannot be collected smoothly due to the intrusion, the filtrate that has passed from the filter cloth to the filtration bed side flows downward along the concave part of the filtration bed to improve filtrate drainage. It is believed that there is. Regarding the former function of the filter bed, the inventor believes that since the stock solution supply port penetrates the filter plate body and conducts between both sides of the filter plate body, in reality, the pressure between the two sides is It was thought that there would be little difference, and there was no need to form it as a surface within the frame. Regarding the latter function of the filtration bed, if it does not have this function, there is a risk that the filtrate recovery cannot be performed smoothly as described above, so it is necessary to use a member with good filtrate drainage and a conventional The present invention was created based on the idea that a member lighter than the filter bed should be provided within the frame.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a filtration unit that is lightweight and has good filtrate discharge properties in order to solve the above-mentioned problems.

Means for Solving the Problems In order to achieve the above object, the present invention eliminates the planar filtration bed in the frame body, and instead supports a filtrate collection member on the frame body or filter cloth to improve filtrate discharge performance. It was configured to do so. That is, the frame and
a pair of filter cloths arranged on both sides in the thickness direction of the frame and surrounding a space formed inside the frame; and a pair of filter cloths arranged in the space of the frame and either the frame or the filter cloth. and a sheet-like elastic filtrate collection member swingably supported by the filtrate collection member, so that the filtrate that has passed through the filter cloth during filtration is transmitted to the filtrate collection member and flows down below the frame.

Effect of the Invention In the above structure, a large number of filtration units are arranged adjacently, and filtration is performed by supplying the stock solution into the filter chamber between a pair of filter cloths sandwiched between adjacent frames, and the cake in the stock solution is filtered. While being held by being held between cloths, the filtrate is passed through a filtrate collection member that has entered the frame through the filter cloth, and is caused to flow down below the frame.

Examples Examples according to the present invention will be described in detail below with reference to FIGS. 1 to 10.

The filtration unit 1 according to this embodiment includes a first filter,
As shown in Figures 2 and 3, a frame 2, a filtrate collection member 3 swingably supported within the frame 2, and a space within the frame 2 arranged on both sides of the frame 2 in the thickness direction. 2
A pair of filter cloths 4, 4 are sandwiched between adjacent frames 2, 2, and the stock solution is pressurized into the filter chamber 8 between the filter cloths 4, 4. While filtering is carried out and the cake is held in the filter chamber 8 between the filter cloths 4, 4, the filtrate is collected in the space 2a in each frame pair 2 through each filter cloth 4, and the filtrate is passed through the filtrate collection member 3. The structure is such that the filtrate is fluidized to the bottom of the frame 2 and collected.

The frame body 2 is a member whose horizontal cross section and vertical cross section are pentagonal, and the inner surface has inclined surfaces 2 which are inclined from the center in the thickness direction to both sides.
e, 2e. A handle 2b is provided near the center of the side surface of each frame 2, and each handle 2b is slidably mounted on a side beam (not shown) installed laterally between the front and rear stands of the filter press. The frame bodies 2 are suspended and supported, and the longitudinal movement of each frame body 2 is guided. An ear is formed at each lower part of the side surface of the frame 2, and a filtrate collection port 2c penetrates through the ear in the thickness direction.
At the same time, communication holes 2d are formed at each lower corner of the frame 2 to communicate the space 2a formed inside the frame 2 and the filtrate recovery port 2c.

The filter cloth 4 is formed by appropriately selecting from various conventionally known materials, and is arranged on both sides of the frame 2 in the thickness direction (both sides in the front and back direction of the filter press), and is placed inside the frame 2. Formed space 2a
a pair of filter cloths 4, which sandwich the frame body 2;
4 is supported by the frame 2 by tightening the upper and lower parts thereof with bolts 9, . . . , 9, respectively. A circular stock solution supply port 4a is penetrated and formed in a position corresponding to the center of the frame 2, and the peripheral edges of the stock solution supply port 4a of both filter cloths 4, 4 are sewn together.

The filtrate collection member 3 is made of cloth as shown in FIG. 4, and is placed in the space 2a inside the frame 2, and its front and rear surfaces are covered with filter cloths 4, 4, respectively. A through hole 3a communicating with the stock solution supply port 4a of the filter cloth 4 is formed in the center of the filtrate recovery member 3, and the peripheral edge of the through hole 3a is connected to the peripheral edge of the stock solution supply port 4a of the filter cloth 4. The filtrate collection member 3 is suspended and supported on the filter cloth 4 by sewing, so that the filtrate collection member 3 can swing together with the filter cloth 4. In this method of supporting the filtrate collection member 3 with respect to the filter cloth 4, the filtrate collection member 3
If it is sewn directly to the filter cloth 4, the size of the mesh of the filter cloth 4 in the sewn part will be uneven compared to the mesh in other parts, and the filtration efficiency will decrease. If the peripheral edge of the stock solution supply port 4a of No. 4 and the peripheral edge of the through hole 3a of the filtrate recovery portion 3 are sewn together, the mesh size of the filter cloth 4 is not affected and the filtration efficiency is not reduced. It is preferable that the filtrate recovery member 3 has a certain degree of stiffness, and in such a member, the filtrate recovery member 3 can be supported within the frame 2 even if it only supports the peripheral edge of the through hole 3a and does not support the upper part. It can be positioned approximately along the upper and lower surfaces. The material of the filtrate collection member 3 may be any natural material, synthetic resin, metal, etc., but a light material is preferred. If it is made of synthetic resin or metal, it may be formed into a net shape. The front shape of this filtrate collection member 3 is square, but is not limited to this and may be any shape such as circular or triangular. A constant interval is formed between the outer peripheral edge of the filtrate collection member 3 and the inner surface 2e of the frame 2.

As shown in FIG.
is attached and a gap is maintained between the filter cloths 4, 4 within the frame body 2 at a certain interval, so that the filtrate can easily enter the inside of the frame body 2 from the filter cloth 4. During this time = holding member 5
As shown in FIG. 6, the convex portion 5b of one divided body 5a is passed through the hole 3b of the filtrate recovery member 3, and is fitted into the hole 5d of the other divided body 5c to remove the filtrate recovery member 3. Attach to.

The above configuration operates as follows. A large number of the above-mentioned filtration units 1, . After tightening a large number of filtration units 1 to the front stand side by moving the plate forward, the stock solution is transferred to each filtration unit 1.
The stock solution is press-fitted from the stock solution supply port 4a of the filter cloth 4 into the filter chamber 8 formed between the pair of filter cloths 4, 4 facing each other, and the stock solution is filtered by each filter cloth 4 and separated into a cake and a filtrate. The cake is held as it is in the filter chamber 8 between the pair of filter cloths 4, 4, while the filtrate passes through each filter cloth 4, enters the inside of the frame 2, and flows downward under the guidance of the filtrate collection member 3. , flows into the filtrate collection port 2c from the communication hole 2d in the lower part of the frame body 2 and is collected.

According to the above embodiment, the frame 2 of the filtration unit 1
The filtrate collection member 3 simply has no filtration bed formed therein.
Since the filter fabric is simply suspended and supported on the filter cloth 4, it is much lighter than the conventional filter in which a filter bed is formed within the frame body 2. In addition, since the filtrate collection member 3 is supported within the frame 2 between the filter cloths 4, the filtrate that has passed from the filter cloth 4 into the frame 2 is transferred to the frame 2 by the filtrate collection member 3. The filtrate collection member 3 can be passed through the lower part of the filtrate to reliably flow down, and the filtrate can be smoothly collected. In addition, since the filtrate collection member 3 is swingably supported together with the filter cloth 4, in the unlikely event that uneven pressure is applied to the filtrate collection member 3,
Even if this occurs, the member 3 can absorb it by swinging, and the member 3 will not be damaged. Furthermore, since the filtrate collection member 3 is made of elastic fabric, it can further absorb the uneven pressure by deforming itself.

Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented in various other embodiments. For example, the thickness of the filtrate collection member 3 may be arbitrary, and its size may be such that there is a constant interval between the inner surface 2e of the frame body 2 and the outer peripheral edge of the filtrate collection member 3, as shown in FIG. However, as shown in FIG. 7, it may extend to the inner surface 2e of the frame 2, or it may extend beyond the inner surface 2e of the frame 2 and be larger than the frame 2.
Further, the number of sheets is not limited to one, but two as shown in FIG. 8, which is a cross-sectional side view of the embodiment shown in FIG.
Any number of sheets may be used. Furthermore, if a plurality of filtrate recovery members 3 are used, gaps are more likely to occur between the opposing filter cloths 4 in the space 2a of the frame body 2, making it easier to recover the filtrate. In addition, filter cloth 4
The filtrate collection member 3 may be attached by sewing at any arbitrary location such as the four corners as shown by A, . . . , A in FIG. Alternatively, the filtrate collection member 3 may be attached to a patch cloth sewn to the filter cloth 4 by sewing or the like. Furthermore, if the filtrate collection member 3 is made of an elastic material, it can absorb the uneven pressure by deforming itself. In addition, even if the filtrate collection member is a rigid body, if it is attached so that it can swing relative to the filtrate 4 or the frame 2,
Even if partial pressure acts on the filtrate collection member 3, the member 3
This can be absorbed by swinging. Further, the filtrate collection member 3 is not limited to a material such as cloth having holes through which the filtrate passes, but may be a sheet-like material having no holes at all.

Further, the spacer holding member 6 may not be separately attached depending on the material of the filter cloths 4, 4, the properties of the stock solution, etc.
Further, the spacer holding members 6 are not limited to those of the above embodiments, but may have any shape, and may be arranged in any number and at any position. For example, as shown in FIGS. 9 and 10, a pair of annular plates 6e, 6e are arranged around the through hole 3a of the filtrate collection member 3, and the bolts 7,
..., 7 may be attached to the filtrate collection member 3. Each plate 6e is formed by combining approximately C-shaped plates 6c and 6d, and recesses 6b for supplying stock solution and protrusions 6a for contact are alternately formed on the surface of each plate 6c and 6d. A large number of frames 2,
..., 2 on one stand side of the filter press with the movable plate, the gap between the convex portion 6 of the holding member 6
a, 6a are in contact with each other, and a pair of recesses 6b, 6b are opposed to form a gap, from which the stock solution is supplied into the filter chamber 8.

The filter cloth 4 may be a single large piece of filter cloth placed over the frame 2 to cover both the front and rear sides of the frame 2, or the filter cloth 4 may be suspended and supported by another member instead of the frame 2. You can do it like this. Furthermore, the arrangement of the stock solution supply port 4a of the filter cloth 4 is not limited to the filtration surface inside the frame.
A so-called top feed type or bottom feed type disposed outside the filtration surface may also be used.

Further, the shape of the filter frame 2 is not limited to a square shape, but may be any shape such as a circle.

Effects of the Invention According to the above configuration, the filtration unit is configured to include a filter cloth, a frame body, and a filtrate recovery member, and a filtration bed is not formed within the frame body, so that the weight of the filtration unit can be reduced. In addition, since the filtrate collection member is swingably supported in the frame between the filter cloths, the filtrate that has passed into the frame from each filter cloth is collected at the bottom of the frame by the filtrate collection member. The fluid can be reliably flowed through the member, and the filtrate can be smoothly collected. Furthermore, since the filtrate collection member is swingably supported relative to the frame or the filter cloth, even if unbalanced pressure is applied to one side of the filtrate collection member, the filtrate collection member can be rocked alone or together with the filter cloth. The filtrate collection member is not damaged by the action of partial pressure. That is, in a conventional filter plate having a filter bed, the filter bed was sometimes damaged due to the rigidity of the filter bed when biased pressure was applied.
Therefore, the present invention can fully achieve its intended purpose.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of a filtration unit according to an embodiment of the present invention, and FIGS.
Figure 4 is a front view of the filtrate collection member with the gap holding member, and Figures 5 and 6 are a cross-sectional side view and gap of the filtrate collection member with the gap holding member attached, respectively. 〓A partial cross-sectional side view of the holding member attached to the filtrate collection member, Fig. 7 is a front view of the filtrate collection member according to another embodiment attached to the filter cloth, and Fig. 8 is the same as that of Fig. 7. - line cross-sectional side view, Figures 9 and 10 are respectively related to other embodiments, a front view with the holding member attached to the filtrate collection member, a - line cross-sectional side view of Figure 9, and Figure 11 are FIG. 2 is a cross-sectional side view of a filter plate main body of a conventional filter plate. DESCRIPTION OF SYMBOLS 1... Filtration unit, 2... Frame, 2a... Space, 2b... Handle, 2c... Filtrate collection port, 2d...
...Communication hole, 2e...Inner surface, 3...Filtrate collection member,
3a...through hole, 3b...hole, 4...filter cloth, 4a
...Standard solution supply port, 5, 6... Between holding member, 5
a, 5b...divided body, 7, 9...bolt, 8...
filter chamber.

Claims (1)

[Scope of Claims] 1. A frame 2; a pair of filter cloths 4, 4 arranged on both sides of the frame 2 in the thickness direction and surrounding a space 2a formed inside the frame 2; and a sheet-like elastic filtrate collection member 3 disposed in the space 2a of the frame 2 and swingably supported by either the frame 2 or the filter cloth 4, and the filtrate that has passed through the filter cloth 4 during filtration. A filtration unit characterized in that the filtrate is transmitted to the filtrate collection member 3 and flows down below the frame 2. 2. The filtration unit according to claim 1, wherein the filtrate collection member 3 is suspended and supported by the filter cloth 4. 3. The filtration unit according to claim 1, wherein the filtrate collection member 3 is suspended and supported by the frame 2. 4. The filtration unit according to any one of claims 1 to 3, wherein the filtrate collection member 3 is made of cloth.