JP5817991B2 - Filter for filter press dehydrator - Google Patents

Description

  The present invention relates to a filter provided with a liquid supply plate between two filter cloths arranged between a filter plate and a diaphragm plate of a filter press type dehydrator, and in particular, a filter cloth formed by the liquid supply plate. The present invention relates to a filter that can prevent damage.

  For example, a filter press type dehydrator as known in Patent Document 1 is used as a waste liquid treatment facility in a waste liquid treatment plant of a steelworks, and the filter press type dehydrator usually has a large number of filter plates and a large number of filter plates. The diaphragm plates are arranged one by one vertically and alternately, and filters are arranged between the opposing filter plates and the diaphragm plates, respectively, and between the filter plates and the diaphragm plates by a hydraulic cylinder. The two filter cloths of the filter and the liquid supply plate between them are sandwiched.

  Next, the filter press dehydrator supplies the waste liquid as the filtrate through the liquid supply plate between the two filter cloths in the sandwiched state, and then the pressurized water supplied between the core plate of the diaphragm plate and the diaphragm. Pressurize the diaphragm with the diaphragm, press one of the filter cloths against the other filter cloth supported by the filter plate, filter the waste liquid, and discharge the filter plate and the diaphragm plate. After draining the filtrate from the road, the distance between the filter plate and the diaphragm plate is widened, and the distance between the two filter cloths is widened while lowering the filter. Drop the cake and discharge.

JP 09-000818 A

  By the way, in the conventional filter for the filter press type dehydrator, the liquid supply plate is made of metal, and extends from the filtrate supply hole penetrating the liquid supply plate in the thickness direction to the lower end of the liquid supply plate. The open end of the existing filtrate outlet is in the immediate vicinity of the two filter cloths.

  For this reason, when supplying the waste liquid between the two filter cloths sandwiched between the filter plate and the diaphragm plate, sludge in the waste liquid ejected from the opening end of the filtrate outflow path rubs the filter cloth. When the diaphragm presses one of the two filter cloths toward the other, the pressing force of the diaphragm causes the one filter cloth to slide into contact with the corner of the lower end of the metallic liquid supply plate. Therefore, there is a problem that the filter cloth is damaged near the lower end of the liquid supply plate and the hole is easily opened, and the filter life is short.

  Therefore, in order to solve the above-mentioned problems, the present invention has an object to provide a filter for a filter press type dehydrator that prevents the filter cloth from being damaged near the lower end portion of the liquid supply plate and extends its life. It is.

The filter for a filter press-type dehydrator according to the present invention that achieves the above object is provided between two filter cloths arranged between a filter plate and a diaphragm plate of the filter press-type dehydrator, and the filter cloth between them. A liquid supply plate, the liquid supply plate being aligned with the filtrate supply hole of the filter cloth and penetrating in the plate thickness direction, and the filtrate supply hole from the filtrate supply hole In a filter having a filtrate outflow passage extending to the lower end of the liquid supply plate,
The liquid supply plate is formed of a deformable resin,
On both sides of the opening end of the filtrate outflow passage at the lower end of the liquid supply plate, two lip portions in the form of a thin plate extending along the lower end are provided ,
Of the two lip portions, the lip portion closer to the filter plate is shorter than the lip portion closer to the diaphragm plate .

  In the filter for a filter press type dehydrator according to the present invention, when the filtrate is supplied between two filter cloths sandwiched between the filter plate and the diaphragm plate, the filter cloth is interposed between the filter cloths. Since the filtrate spouted from the open end of the filtrate outlet passage of the liquid supply plate located flows between the two filter cloths while spreading left and right through the gap between the two lip portions, Solid matter such as sludge hardly rubs and wears the filter cloth, and when the diaphragm presses one of the two filter cloths toward the other, the pressing force of the diaphragm causes the one filter cloth to be pressed. Since the lip portion is deformed by being brought into sliding contact with the lip portion at the lower end portion of the deformable resin liquid supply plate, the lip portion hardly wears the filter cloth.

  Therefore, according to the filter for a filter press type dehydrator of the present invention, it is possible to effectively prevent perforation due to filter cloth damage in the vicinity of the lower end of the liquid supply plate. The service life can be extended more than before.

Furthermore , in the filter for a filter press type dehydrator according to the present invention, the lip portion near the filter plate of the two lip portions is shorter than the lip portion near the diaphragm plate .

With this configuration , the lip portion near the diaphragm plate protects the filter cloth from the diaphragm, while the lip portion near the filter plate is shorter than the lip portion near the diaphragm plate, so that solids such as sludge in the filtrate are filtered. The filtration efficiency of the filtrate can be increased by reducing the flow resistance of the filtrate while protecting the filter cloth by blocking the hitting.

In the filter for a filter press type dehydrator according to the present invention, it is preferable that the liquid supply plate is formed of two thin plates, and these thin plates are respectively attached to the two filter cloths.

  In this way, each thin plate does not have an inverse shape, and has a supply hole, a groove portion that defines a filtrate outflow passage, and one of the two lip portions. A molding die such as injection molding formed from a material can be configured easily and inexpensively.

(A), (b) is the front view and side view which show the normal filter press type dehydrator to which one Embodiment of the filter for filter press type dehydrators of this invention is applied. (A), (b) is the front view and side view which show the filter plate of the said filter press type dehydrator. (A), (b) is the front view and side view which show the diaphragm board of the said filter press type dehydrator. (A), (b) is the front view and side view which show the filter for filter press type dehydrators of the said embodiment. (A), (b), (c) is the front view, side view, and bottom view which show the liquid supply board of the filter for filter press type dehydrators of the said embodiment. (A), (b) is a state in which the filter press-type dehydrator is positioned at a press position in which the filter plate and the diaphragm plate are sandwiched between the filter plate and the diaphragm plate, and the interval between the filter plate and the diaphragm plate is widened. FIG. 6 is an explanatory diagram showing a state where the filter is located at an open position where the filter is opened. (A) is a state in which the filtrate is supplied between the filter cloths of the filter sandwiched between the filter plate and the diaphragm plate, (b) is a state in which the filter cloths of the filter are pressed by pressing the diaphragm with pressurized water, (c ) Is a state in which the filter is opened by widening the distance between the filter plate and the diaphragm plate, and (d) is a state in which the cake is dropped by widening the distance between the two filter cloths while moving the opened filter downward. It is explanatory drawing which shows each.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Here, FIGS. 1A and 1B are a front view and a side view showing a normal filter press dehydrator to which an embodiment of a filter for a filter press dehydrator of the present invention is applied, and FIG. FIGS. 3A and 3B are a front view and a side view showing a filter plate of the filter press type dehydrator, and FIGS. 3A and 3B are a front view and a front view showing a diaphragm plate of the filter press type dehydrator. It is a side view.

  As shown in FIG. 1, this filter press type dehydrator includes a large number of filter plates 1 and a large number of diaphragm plates 2 arranged alternately one by one in a vertical state, and the filter plates 1 and the diaphragm plates. A plurality of filters 3 respectively disposed between them, rails 4 for supporting the filter plates 1 and the diaphragm plates 2 so as to move horizontally in the approaching and separating directions, and the filter plates 1 and the diaphragms. A hydraulic cylinder 5 for moving the plate 2 along the rail 4 between a press position where the plates 2 are liquid-tightly overlapped with each other via a filter 3 and an open position where the plates 2 are separated from each other; and the filter plate 1 and the diaphragm plate 2 A filter lifting / lowering mechanism 6 is provided for moving all the filters 3 downward and upward at the same time when positioned in the open position.

  Here, the filter plate 1 and the diaphragm plate 2 are ordinary ones, and as shown in FIGS. 2 and 3, each filter plate 1 has a recess 1a for defining a filtration chamber on both sides, and as a through hole. Each of the diaphragm plates 2 has a filtrate supply hole 1b formed, and a core plate 2b having a recess 2a for defining a filtration chamber on both sides, and is stretched on both sides of the core plate 2b. In addition to two diaphragms (not shown) fixed to the periphery of the concave portion 2a of the core plate 2b in a liquid-tight manner, it also has a filtrate supply hole 2c formed as a through hole. Further, the filter plate 1 and the diaphragm plate 2 are each provided with two rollers 1c and 2d at their lower ends.

  4 (a) and 4 (b) are a plan view and a side view showing the filter for a filter press type dehydrator according to the above embodiment, and FIGS. 5 (a), (b) and (c) are filters according to the above embodiment. It is a front view, a side view and a bottom view showing a liquid supply plate of a filter for a press-type dehydrator, each filter 3 of this embodiment is formed by folding a single rectangular filter cloth at the longitudinal center, The folded portion 7 is the upper end portion 7a and the original both end portions are the lower end portions 7b, and a two-layer filter cloth 7 having a filtrate supply hole 7c formed in the central portion in the width direction near the upper end portion 7a. And a filtrate supply hole 8a comprising a through hole aligned with the filtrate supply hole 7c in the vicinity of the upper end 7a of the filter cloth 7 and extending downward from the filtrate supply hole 8a to the lower end 8b. Hold two filtrate outflow passages 8c having an oval cross-sectional shape. Is arranged between the filter cloth 7 La 2 ply, it has a liquid supply plate 8 which is fixed on both sides to the filter cloth 7 of them two-ply.

  The liquid supply plate 8 here is made of a resin that can be deformed with a certain degree of elasticity, such as polypropylene, and on both sides of the lower end portion 8b of the liquid supply plate 8 at the open end of the filtrate outflow passage 8c, In FIG. 4 (a) and FIG. 5 (a) along the lower end portion 8b, two thin plate-like lip portions 8d extending in the left-right direction are formed integrally with the lower end portion 8b. Here, of the two lip portions 8d, the lip portion 8d near the filter plate 1 is shorter than the lip portion 8d near the diaphragm plate 2.

  6 (a) and 6 (b) show a state in which the filter press-type dehydrator is positioned at a press position where the filter plate 1 and the diaphragm plate 2 are sandwiched between the filter plate 1 and the diaphragm plate 2, and the filter plate 1 and the diaphragm. It is explanatory drawing which each shows the state located in the open position which expands the space | interval with the board 2, and opens the filter 3. FIG. 7 (a) shows a state in which the filtrate is supplied between the filter cloths 7 of the filter 3 sandwiched between the filter plate 1 and the diaphragm plate 2. FIG. 7 (b) shows the filter by pressing the diaphragm with pressurized water. Fig. 7 (c) shows a state in which the filter cloth 7 of Fig. 7 is pressed, Fig. 7 (c) shows a state in which the filter 3 is opened by widening the distance between the filter plate 1 and the diaphragm plate 2, and Fig. 7 (d) shows the filter 3 in the opened state. It is explanatory drawing which each shows the state which expanded the space | interval of the two filter cloths 7 and made the cake fall, making it move downward. However, for simplification of illustration, the filters 3 positioned on the outside of the filter plate 1 and the diaphragm plate 2 are omitted.

  In the filter press dehydrator provided in the waste liquid treatment plant of the ironworks, the hydraulic cylinder 5 presses a large number of filter plates 1 and a large number of diaphragm plates 2, and these are mutually connected via the filter 3. When placed in the press position shown in FIG. 6 (a) that overlaps in a liquid-tight manner, the overlapping filter plate 1 and the concave portions 1a and 2a of the diaphragm plate face each other to define a filtration chamber and overlap The filtrate supply holes 1b and 2c respectively formed in the filter plate 1 and the diaphragm plate 2 are aligned with the filtrate supply holes 7c and 8a of the filter 3 to define a filtrate supply path, as shown in FIG. In addition, the waste liquid as the filtrate is pumped to each filter 3 through the filtrate supply path and passes through the filtrate outflow path 8c from the filtrate supply hole 8a of the liquid supply plate 8 (see FIGS. 4 and 5). Filtration of two filter cloths 7 It is supplied between the intermediate portion positioned within. The supplied waste liquid passes through the filter cloth 7 with the pressure of the waste liquid supplied later, becomes a filtered liquid, and is discharged through the filtered liquid passages formed in each filter plate 1 and diaphragm plate 2.

  Next, as shown in FIG. 7 (b), pressurized water is supplied between the core plate 2b of each diaphragm plate 2 and the diaphragms on both sides thereof, and the diaphragm pressed by the pressurized water becomes two filter cloths 7 in the filtration chamber. One filter cloth 7 near the diaphragm is pressed against the other filter cloth 7 near the filter plate 1 supported by the filter plate 1, and thereby, between the two filter cloths in the filter chamber. The supplied waste liquid is pressed, the water in the waste liquid passes through the filter cloth 7 to become a filtered liquid, and the remaining solid content is solidified into a thick plate to become a so-called cake 9.

  Next, when the hydraulic cylinder 5 pulls the large number of filter plates 1 and the large number of diaphragm plates 2 and positions them apart from each other, the filter lift mechanism 6 is moved to the position of all the filters. 7 (d), both ends are coupled to the upper end portion 7a and the lower end portion 7b of the filter cloth 7 and a plurality of chains hung on a large number of sprockets on a common drive shaft are simultaneously moved. Thus, the upper ends 7a of the filter cloths 7 of all the filters 3 are simultaneously lowered between the filter plate 1 and the diaphragm plate 2, and at the same time, two are provided at the lower ends of the filter plate 1 and the diaphragm plate 2, respectively. The lower ends 7b of the filter cloths 7 wound around the rollers 1c and 2d (see FIGS. 2 and 3) are simultaneously pulled up, and the cake 9 sandwiched between the two filter cloths 7 is removed Remove from filter cloth 7 and down Allowed to fall.

  Thereafter, the filter elevating mechanism 6 simultaneously raises the upper end portions 7a of the filter cloths 7 of all the filters 3 between the filter plate 1 and the diaphragm plate 2 by the operation opposite to the above, and at the same time, The lower end portion 7b is lowered at the same time, and the intermediate portion of the filter cloth 7 is returned to the space between the filter plate 1 and the diaphragm plate 2 while spray cleaning, and the hydraulic cylinder 5 moves the multiple filter plates 1 and the multiple diaphragm plates 2 together. Press to place them in the initial press position shown in FIG.

  During the operation of the filter press dehydrator, in the filter 3 of this embodiment, waste liquid as filtrate is supplied between the two filter cloths 7 sandwiched between the filter plate 1 and the diaphragm plate 2. In this case, the waste liquid spouted from the open end of the filtrate outflow passage 8c of the liquid supply plate 8 located between the filter cloths 7 spreads to the left and right through the gap between the two lip portions 8d, and the two filters. Since it flows between the cloths 7, sludge etc. in the waste liquid hardly rubs and wears the filter cloth 7, and when the diaphragm presses one of the two filter cloths 7 toward the other, The diaphragm pressing force causes one filter cloth 7 to slide in contact with the lip portion 8d at the lower end of the deformable resin liquid supply plate 8, and the lip portion 8d bends toward the other lip portion 8d. Since it is deformed, the bent lip portion 8d is It is hardly possible to wear the.

  Therefore, according to the filter 3 for the filter press type dehydrator of the present embodiment, it is possible to effectively prevent perforation due to damage of the filter cloth 7 in the vicinity of the lower end portion of the liquid supply plate 8. The lifetime of the machine filter can be extended compared to the conventional one.

  Moreover, in the filter 3 for filter press type dehydrators of this embodiment, the lip part 8d near the filter plate 1 out of the two lip parts 8d is shorter than the lip part 8d near the diaphragm plate 2. Therefore, the lip portion 8d near the diaphragm plate 2 protects the filter cloth 7 from the diaphragm, while the lip portion 8d near the filter plate 1 protects the filter cloth 7 by blocking sludge and the like in the waste liquid from hitting the filter cloth 7. Meanwhile, the flow resistance of the waste liquid can be reduced and the filtration efficiency of the waste liquid can be increased.

  In addition, when the filter 3 of this embodiment was applied to the filter press-type dehydrator provided in the waste liquid treatment plant of the steelworks, the filter life could be extended to 2.2 times that of the conventional filter.

As mentioned above, although demonstrated based on the example of illustration, this invention is not limited to the above-mentioned example .

For example, in the above-described example, the liquid supply plate 8 is formed of a single resin plate, but the liquid supply plate 8 is formed of two thin plates that are attached to two filter cloths 7 respectively. In this way, each thin plate has a supply hole that does not have an inverse shape, a groove portion that defines a filtrate outflow passage, and one of the two lip portions. A molding die such as injection molding for forming a thin plate having a resin from a resin material can be configured simply and inexpensively.

  Furthermore, although the filter of the above example was applied to a filter press type dehydrator that is provided in a waste liquid treatment plant of an ironworks and processes waste liquid containing sludge, the filter of the present invention is not limited to this, and other types of filters. The present invention can also be applied to a filter press type dehydrator for processing a liquid.

Thus, according to the filter for the filter press type dehydrator of the present invention, it is possible to effectively prevent perforation due to damage to the filter cloth in the vicinity of the lower end of the liquid supply plate. In addition, while the filter cloth is protected from the diaphragm by the lip portion near the diaphragm plate, the sludge in the filtrate is formed by the lip portion near the filter plate that is shorter than the lip portion near the diaphragm plate. while solids equal protects the fabric Iro blocking the hitting the filter cloth reduces the flow resistance of the filtrate Ru can improve the filtration efficiency of the filtrate.

DESCRIPTION OF SYMBOLS 1 Filter plate 1a Concave 1b Filtrate supply hole 1c Roller 2 Diaphragm plate 2a Concave 2b Core plate 2c Filtrate supply hole 2d Roller 3 Filter 4 Rail 5 Hydraulic cylinder 6 Filter lifting mechanism 7 Filter cloth 7a Upper end 7b Lower end 7c Filtrate Supply hole 8 Liquid supply plate 8a Filtrate supply hole 8b Lower end part 8c Filtrate outflow path 8d Lip part 9 Cake

Claims (2)

A filter comprising two filter cloths arranged between a filter plate and a diaphragm plate of a filter press-type dehydrator, and a liquid supply plate positioned between the filter cloths, the liquid supply plate Has a filtrate supply hole aligned with the filtrate supply hole of the filter cloth and penetrating in the plate thickness direction, and a filtrate outflow passage extending from the filtrate supply hole to the lower end of the liquid supply plate. In the filter,
The liquid supply plate is formed of a deformable resin,
On both sides of the opening end of the filtrate outflow passage at the lower end of the liquid supply plate, two lip portions in the form of a thin plate extending along the lower end are provided ,
The filter press type filter for a dehydrator , wherein a lip portion near the filter plate of the two lip portions is shorter than a lip portion near the diaphragm plate . The liquid feed plate is formed of a thin plate of 2 ply, their thin plate and being attached to each of the two filter cloth, filter claim 1 filter press type dehydrator according .

Images