JPH0641808U - Filter plate - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a filter plate for a filter press, which has a minimum filtration area and a small deformation due to pressure. A peripheral part 6 having a wall thickness thicker than that of the filtering part is formed on the periphery of the filtering part 2 having a filtrate passage groove 3, and a reinforcing part 4 having a truncated cone shape in cross section is provided in the filtering part. The top surface is formed at the same height as the peripheral portion 6. The auxiliary reinforcing portion 5 around the reinforcing portion 4 is formed flat at the same height as the filtering portion 2, and the width L thereof is 2 to 6 times the depth h of the groove.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a filter plate incorporated in a filter press used for solid-liquid separation, which does not reduce the filtration area and reduces deformation due to pressure.

[0002]

[Prior art]

 Conventionally, various types of filter plates made of synthetic resin, which are used by being incorporated in a filter press machine, are known, but usually, a straight or zigzag-shaped groove for filtrate passage for drainage is formed on the surface thereof. It is composed of a filter part provided and a thick peripheral part (seal part) formed on the periphery of the filter part. Used. During filtration, the peripheral parts of each filter plate are brought into contact with each other and sealed by a pressing device, a filtration chamber is formed between the filter plates, and slurry or the like is introduced into the filtration chamber and pressure filtered. It After filtration, the filter plate is opened and the residue is drained.

[0003]

[Problems to be solved by the device]

 Since the filter press machine repeats the above cycle, the filter plate may be deformed due to the differential pressure between the front and back of the filter plate generated when the pressure is applied in this step. Further, if this deformation is repeated, it may lead to fracture from the stress concentration point. In order to reduce this deformation, it has been practiced to provide a reinforcing part in the filtering part with a thickness similar to that of the peripheral part of the filtering part. However, if a large number of reinforcing parts are provided, the reinforcing part will be occupied. Therefore, there is a problem that the filtration area is reduced by the area corresponding to the area and the filtration efficiency is reduced. The applicant has already proposed to arrange this reinforcing portion at a specific position (Japanese Patent Publication No. 61-181508). The present invention aims to disperse and reduce the stress by reducing the occupying area of the reinforcing portion provided on the filter plate as much as possible to suppress the reduction of the filtering area and the reduction of the filtration efficiency, and by forming the predetermined auxiliary reinforcing portion. The purpose is to prevent the deformation that occurs in the filter plate.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention forms a peripheral portion thicker than the filtering portion at the periphery of the filtering portion having a filtrate passage groove on at least one side, and the filtering portion has a circular truncated cone section. A filter plate having a shaped reinforcing portion, wherein the top surface of the reinforcing portion is formed substantially flush with the peripheral portion, and an auxiliary reinforcing portion is formed around the reinforcing portion. Further, as described later, it is preferable that the auxiliary reinforcing portion is formed to be flat at the same height as the filtering portion and the width thereof is 2 to 6 times the groove depth of the filtering portion.

Hereinafter, the contents of the present invention will be described in detail with reference to the drawings. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a graph showing an example of the relationship between the width of the auxiliary reinforcing portion and the maximum principal stress. The groove 3 is not shown in FIG. The filter plate 1 has a filter section 2 in which a plurality of grooves 3 for passage of a filtrate are provided on at least one surface of a base whose contour is a quadrangle or a circle as shown in the drawing. A peripheral portion (sealing portion) 6 having a thickness larger than that of the filtering portion 2 is formed on the peripheral edge thereof. At least one or more reinforcing portions 4 having a truncated cone shape in cross section are formed at appropriate positions of the filtering portion 2. The top surface of the reinforcing portion 4 is formed at substantially the same height as the peripheral portion 6. Further, a flat auxiliary reinforcing portion 5 is formed around the reinforcing portion 4. The liquid supply port 7 is provided at the center of the filtration section or at another appropriate position. For example, when the groove 3 formed in the filter plate 1 is linear, the auxiliary reinforcing portion 5 does not reach the skirt of the reinforcing portion, and the auxiliary groove 5 is formed around the reinforcing portion. The groove may be filled. When the groove 3 engraved for the passage of the filtrate has a zigzag shape formed by a plurality of regularly formed columnar protrusions, the groove closest to the skirt of the reinforcing portion is filled. You can The height of the auxiliary reinforcing portion 5 is almost the same as the height of the normal filtering portion 2.

[0006]

[Test example]

 The width L of the auxiliary reinforcing portion 5 around the reinforcing portion 4 is preferably in the range of 2 to 6 times the depth h of the groove 3. The reason will be understood from the following test example regarding the relationship between the width L of the auxiliary reinforcing portion and the maximum principal stress. In the test example, the relationship between the maximum principal stress when the width L of the auxiliary reinforcing portion 5 is changed and the auxiliary reinforcing portion 5 is included for the two types of filter plates having the filtration portion thickness (H) of 22 mm and 38 mm. The maximum principal stress ratio in comparison with the non-filter plate was measured and investigated. The results are shown in the graph of FIG. As is clear from FIG. 3, it can be seen that the maximum principal stress decreases as the width L of the auxiliary reinforcing portion 5 increases, and the maximum principal stress becomes constant when the width exceeds a certain value. . If the width L of the auxiliary reinforcing portion 5 is increased, the number of the groove 3 that serves as a flow path for the filtrate will decrease and the filtration efficiency will decrease. It can be said that the width is optimum. In the case of FIG. 3, when the filtration portion thickness is 22 mm, the ratio to the groove depth is about 5 times, and when the filtration portion thickness is 38 mm, it is about 3 times. In the case of an ordinary filter plate, the minimum thickness of the filtration portion is 22 mm, and the maximum thickness is often 38 mm. Therefore, the above-mentioned filtration portion thickness was used for the test. In addition, considering the influences of the distance between the reinforcing portions and the distance between the reinforcing portion and the peripheral portion, the width L of the auxiliary reinforcing portion 5 is in the range of 2 to 6 times the depth h of the groove 2. It can be said that it is preferable to set.

[0007]

【Example】

 A square filter plate with a side of 1220mm has four sides with a thickness of 73mm and a width of 60mm on the inside, and inside of it, there are concave and convex grooves with a width of 6mm and a depth of h = 4mm. A filter part having a thickness H = 23 mm was formed by engraving the (width of the convex part of the filter part) at an interval of 7 mm. On the two diagonal lines of this filter section, a reinforcing section formed in the shape of a truncated cone and having the same height as the upper surface of the peripheral section is divided into three equal lengths of the diagonal line of the filter section. Four locations are provided at each position. The truncated conical shape had a top surface diameter of 60 mm, and the gradient from the top surface portion to the filtration portion was 30 °. The liquid supply port was provided at the center of the filtration section. The deflection ratio and the maximum principal stress ratio of the conventional filter plate having the above-mentioned shape without the auxiliary reinforcement portion 5 and the filter plate with the auxiliary reinforcement portion 5 having the width L = 22 mm are compared and the results are shown in Table 1. It was as follows.

[0008]

[Table 1]

As is clear from Table 1 above, in the example, the deflection and the maximum principal stress ratio are significantly smaller than those of the conventional example without the auxiliary reinforcing portion, and the deformation due to the pressurization is less likely to occur. confirmed.

[0010]

[Effect of device]

 According to the present invention, by forming a predetermined auxiliary reinforcing portion, the occupying area of the reinforcing portion provided on the filter plate is reduced as much as possible to suppress the reduction of the filtering area and to disperse and reduce the stress, and The effect that the deformation which occurs can be prevented is exhibited.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a graph showing an example of the relationship between the width of the auxiliary reinforcing portion and the maximum principal stress.

[Explanation of symbols]

 1 Filter plate 2 Filtration part 3 Groove 4 Reinforcement part 5 Auxiliary reinforcement part 6 Peripheral part L Width of auxiliary reinforcement part 5 h Depth of groove 3

Claims (2)

[Scope of utility model registration request] 1. A peripheral portion having a wall thickness greater than that of the filtration portion is formed at the periphery of the filtration portion having a groove for a filtrate passage on at least one surface, and a reinforcement portion having a truncated cone shape in section is disposed in the filtration portion. A filter plate, wherein the top surface of the reinforcing portion is formed to be substantially flush with the peripheral portion, and an auxiliary reinforcing portion is formed around the reinforcing portion. 2. The auxiliary reinforcing portion is formed to be flat at the same height as the filtering portion, and the width thereof is 2 to 6 times the depth of the groove. Filter plate.