JP2011036822A - Filter frame in filter press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent early damage of filter cloth by keeping the optimum form of a filtration chamber without using a metallic spacer. <P>SOLUTION: The filter frame 1 is disposed between filter plates 2, supported inside an outer frame 3, and made of a rubber sealing material of high hardness formed thick to protrude to both sides in the thickness direction of the outer frame 3. An inside circumferential cross section of the filter frame 1 is formed concave to enlarge a difference in curvatures before and after elastic deformation due to the compression in the thickness direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a filter frame disposed between filter plates in a filter press.

Conventionally, this type of filter frame has a rubber seal attached to the core frame supported on the inner side of the outer frame, and the seal is a soft rubber having a low rubber hardness in order to enhance the sealing performance with the filter plate when closed. I use something.
Therefore, in order to protect the filter frame and maintain the optimum shape of the filtration chamber and to perform proper filtration, it is necessary to regulate the extreme compression pressure acting on the filter frame between the filter plates by the tightening force when closing the plate. As disclosed in Patent Document 1, a plurality of metal spacers protruding forward and rearward of the filter frame are provided on the outer periphery of the filter frame, and the filter frame is protected by interposing abutment between the filter plates when closed. is doing.
Also, the outer periphery of the filter frame is formed in a C-shaped groove so that the sealing material does not come off from the core frame due to compression when the plate is closed, and the core frame is held by the C-shaped groove on the outer periphery of the filter frame. The frame is prevented from falling off from the core frame.

Japanese Utility Model Publication No. 4-50883

However, by repeated repeated use under strong tightening pressure, the part of the filter cloth on the filter plate that is in direct contact with the metal spacer at the time of closing is worn earlier than the other part, and eventually a hole opens, and the filter starts from the part. There is a problem that the cloth is easily torn.
Also, when attaching the filter frame to the outer frame (core frame), it is necessary to hold the core frame while elastically deforming the C-shaped groove on the outer periphery of the filter frame. Therefore, it is very troublesome to attach the filter frame to the core frame. It took time and effort.

Therefore, the main object of the present invention is to prevent early breakage of the filter cloth so that the optimum shape of the filtration chamber can be maintained without using a metal spacer as in the prior art.
In addition, even if the grooves formed on the outer periphery of the filter frame are formed in a simple shape so that the filter frame can be easily attached to the core frame, the object is to prevent the filter frame from being easily dropped from the core frame.

In view of the above problems, the filter frame in the filter press of the present invention is a filter frame disposed between filter plates, and the filter frame is supported on the inner side of the outer frame and protrudes forward and backward in the thickness direction of the outer frame. It is made of a rubber seal material with a high hardness, and the inner peripheral cross section of the filter frame is formed in a concave shape so that the difference in curvature before and after elastic deformation due to compression in the thickness direction becomes large. .
Also, a concave groove may be formed on the outer periphery of the filter frame, and a core frame formed in a square cross section supported inside the outer frame may be fitted into the concave groove.

In short, the filter frame of the present invention is composed of a high-hardness rubber sealing material that is supported on the inner side of the outer frame and is formed thick so as to protrude forward and backward in the thickness direction of the outer frame. It is elastically deformed so that it adheres and maintains good sealing (sealing) properties, while maintaining durability. Therefore, the optimum shape of the filtration chamber can be maintained as in the conventional case, which is necessary for conventional filter frames. The previously used metal spacer can be dispensed with.
For this reason, the material cost of the metal spacer used for the filter frame can be reduced, the cost can be reduced, and the life of the filter cloth deposited on the filter plate can be increased as compared with the conventional case.

  Also, the inner circumferential cross section of the filter frame is formed in a concave shape so that the difference in curvature before and after elastic deformation due to compression in the thickness direction is increased, so that the compression frame is compressed more than when the filter plate is closed in the thickness direction. Since the curvature of the concave shape of the inner peripheral cross section is larger when the plate is released, the outer periphery of the filter cake produced in the filter frame by being filtered when the plate is closed adheres to the inner peripheral surface of the filter frame. When the plate is opened, the compression of the filter frame is released, and at the same time, the inner peripheral surface of the filter frame elastically recovers with a larger curvature than the outer periphery of the filter cake, so that a gap is formed between the inner peripheral surface of the filter frame and the outer surface of the filter cake. It is easy and reliable to remove the filter cake from the filter frame.

In addition, a concave groove is formed on the outer periphery of the filter frame, a core frame supported on the inner side of the outer frame is formed in a square shape, and the concave groove is simply fitted to the core frame. The frame can be easily attached and the work efficiency can be improved.
And even if it is easy to mount as described above, the filter frame according to the present invention is made of high-hardness rubber as described above, and therefore, the concave groove on the outer periphery of the filter frame is firmly fitted to the core frame. Its practical effect is great, such as the filter frame does not fall off easily.

It is a front view of a filter frame. It is AA sectional drawing of FIG. It is principal part sectional drawing which shows a closed plate state. It is principal part sectional drawing which shows a state immediately after opening a plate.

An embodiment of the present invention will be described below with reference to the drawings.
The filter frame 1 shown in the figure is arranged in parallel so as to be interposed between the filter plates 2 in the longitudinal direction of the filter press, and is supported inside the outer frame 3 made of metal and in a rectangular frame shape. It consists of a rubber seal material with a high hardness selected from a range of 80 ° to 90 ° in JIS rubber hardness formed so as to protrude forward and backward in the thickness direction of the frame 3.

  The outer frame 3 is provided with a support piece 5 of the core frame 4 projecting from the inner intermediate portion of each side, the annular core frame 4 is fixed to the tip of the support piece 5, and an arm at the outer intermediate portion of the left and right sides. 6 is projected.

Further, the filter frame 1 is formed by forming a concave groove 1b having a concave cross section on the outer periphery thereof, and fitting a core frame 4 formed in a square cross section supported inside the outer frame 3 into the concave groove 1b. It is attached to the core frame 4 and supported inside the outer frame 3.
The inner peripheral surface 1a of the filter frame 1 is formed in a concave shape (concave shape) in its cross-sectional shape so that the difference in curvature before and after elastic deformation due to compression in the thickness direction becomes large.

In the filter frame 1 configured as described above, the peripheral wall of the filtration chamber 7 is configured by being sandwiched between the front and rear filter plates 2 when the plate is closed.
In such a state, the filter frame 1 is made of a rubber seal material having a high hardness, so that the optimum shape of the filtration chamber 7 is maintained without being deformed even when pressed between the filter plates 2.

Then, the filter frame 1 is elastically deformed so that a portion of the filter frame 1 that contacts the filter plate 2 via a filter cloth (not shown) comes into close contact with the filter plate 2 to maintain good sealing performance.
Thus, since the filter frame 1 made of a rubber seal material is in direct contact with the filter cloth, the filter cloth is not damaged.

When the stock solution is poured into the filtration chamber 7 in the closed plate state and the filtration is completed, the filter cake W which is opened and remains in the filtration chamber 7 is discharged to the outside.
In discharging the filter cake W, the concave curvature of the inner peripheral surface 1a of the filter frame is greater when the filter frame 1 is opened than when the filter frame 1 is compressed in the thickness direction. Since the curvature is large, even if the outer periphery of the filter cake W in the filter chamber 7 is in close contact with the inner peripheral surface 1a of the filter frame, the compression to the filter frame 1 is released at the time of opening the plate and at the same time the curvature is larger than the outer periphery of the filter cake W. Since the inner peripheral surface 1a of the filter frame is elastically restored, a gap is formed between the inner peripheral surface 1a of the filter frame and the outer periphery of the filter cake W, and the elastic force generated when the filter frame 1 is deformed is also reliably filtered.滓 W can be removed from the filter frame 1 (see FIGS. 3 and 4).

1 Filter frame
1a (Filter frame) inner surface
1b Groove 2 Filter plate 3 Outer frame 4 Core frame

Claims (2)

  A filter frame disposed between filter plates, the filter frame being supported on the inner side of the outer frame and from a high hardness rubber sealing material formed so as to protrude forward and backward in the thickness direction of the outer frame A filter frame in a filter press, characterized in that the inner peripheral cross section of the filter frame is formed in a concave shape so that the difference in curvature before and after elastic deformation by compression in the thickness direction becomes large.   2. A filter frame in a filter press according to claim 1, wherein a concave groove is formed on the outer periphery, and a core frame formed in a square cross section supported inside the outer frame is fitted into the concave groove.

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