WO2011077585A1 - Single-chamber type rotary filter - Google Patents

Abstract

Provided is a single-chamber type rotary filter which enables decrease of leakage of a circulated gas and decrease of energy consumption, and further facilitates miniaturization of the instruments. The disclosed single-chamber type rotary filter is equipped with a rotary drum (1) having a filtration function and being attached pivotally to a center pipe (2). The lower portion of the rotary drum (1) is immersed into a source liquid vat (3), and a source liquid slurry (F) is pressure-filtered. The filtrate is discharged out of the filter machine through a filtrate-discharging tube (5) connected to the center pipe. The layer of the cake deposited on the rotary drum (1) is recovered by peeling by a gas blown through holes (6A₁) of a first valve shoe (6A) which is connected to the center pipe (2) for communication therewith and is placed to oppose the inner peripheral face of the rotary drum (1) with a small gap. The valve shoe (6) is provided with a pressing means to press the sliding face thereof formed along the inner peripheral face of the rotary drum (1) against the inner peripheral face of the rotary drum (1).

Description

Rotary single chamber filter

The present invention relates to a rotary single-chamber filter, and more particularly, to a rotary single-chamber filter that can reduce the amount of gas circulating in the apparatus and can promote energy saving.

There are two types of rotary single-chamber filters: a pressurization type and a depressurization type, each of which has a filtration chamber mainly composed of a single-unit rotary drum. High cleaning efficiency because it can maintain a uniform flow of cleaning liquid throughout the cake. Blow-back air efficiently blows back the filter cloth from the back side, making it easy even with a cake layer that is difficult to filter. It has many advantages such as easy peeling and easy maintenance due to its simple structure, and is used in many fields such as general chemical industry, fertilizer industry, metal industry and food industry.

Therefore, a conventional rotary single-chamber filter in the case of a pressure type will be described with reference to FIGS. As shown in FIG. 3, this rotary single-chamber filter has both ends sealed and a large number of filtrate holes (not shown) are formed on the peripheral surface, and an arrow θ is formed by a variable speed reducer (not shown). A rotating drum 1 that rotates in a direction, a center pipe 2 that rotatably supports the rotating drum 1, and a stock solution bat 3 that is disposed below the rotating drum 1, and is disposed in a casing 4. Yes. A filter cloth (not shown) is stretched on the outer peripheral surface of the rotating drum 1 via a filter bridge (not shown), and the lower part of the rotating drum 1 is immersed in the stock solution slurry F filled with the stock solution bat 3. Thus, a filtration region is formed, for example, by a pressure difference between the inside and outside of the rotating drum 1 while the rotating drum 1 rotates under a pressurized gas (hereinafter also referred to as “circulating gas” as appropriate) circulating in the casing 4. In the filtration region, a cake layer composed of the solid components of the raw slurry F is formed on the surface of the filter cloth, and the filtrate permeates the filter cloth and enters the rotary drum 1, and is rotated by the filtrate pipe 5 connected to the center pipe 2. The filtrate in the drum 1 is led out of the machine by a collecting device (not shown).

Further, a plurality of valve shoes 6 made of a synthetic resin such as tetrafluoroethylene resin are disposed in the rotating drum 1 along the axial direction of the center pipe 2, and a narrow gap is formed on the inner peripheral surface of the rotating drum 1. It is in sliding contact. A plurality of holes (not shown) are formed in the upper part of the valve shoe 6 along the axial direction of the rotary drum 1, and blow gas or the like is ejected from these holes to peel off the cake layer on the filter cloth and rotate. The drum 1 is washed from the inside to prevent clogging.

That is, the blow hole of the valve shoe 6 is connected to the center pipe 2 via the valve bar 7, and blow gas such as nitrogen gas supplied to the center pipe 2 is blown from a plurality of holes to peel off the cake layer on the surface of the filter cloth. To do. A filter cloth cleaning spray 8A is disposed outside the rotary drum 1 and slightly below the blow hole of the valve shoe 6, and the cleaning liquid is sprayed from the filter cloth cleaning spray 8A toward the rotary drum 1 at a high speed. The filter cloth after delamination is washed, and impurities on the filter cloth surface are washed and removed. In FIG. 3, C is a cake peeled from the filter cloth, 8B is a cake washing spray disposed outside the rotary drum 1, and the cake layer formed on the filter cloth is washed with the cake washing spray 8B. To do. Reference numeral 9 denotes a chute for discharging the cake to the outside of the machine, and reference numeral 10 denotes a gas supply unit for supplying pressurized gas into the casing.

Next, the operation of the rotary single chamber filter will be described. When the rotating drum 1 rotates counterclockwise as shown in FIG. 3 under the pressure of the pressurized gas supplied from the gas supply unit 10 into the casing 4, the inside of the stock solution bat 3 is filtered in the filtration region of the rotating drum 1. The stock solution slurry F is sucked to form a solid component as a cake layer on the surface of the filter cloth, and the filtrate is accumulated in the rotary drum 1. The filtrate is led out of the machine from the filtrate pipe 5 through the center pipe 2 by a collecting device (not shown). On the other hand, as the rotating drum 1 rotates, the cake layer comes out of the raw slurry F and is gradually drained, and is washed while passing under the cake washing spray 8B. As shown in FIG. 4, when the cake layer after washing reaches the valve shoe 6 as the rotary drum 1 rotates in the direction of the arrow θ, the blow gas from the blow holes is indicated by the arrow X in the rotary drum 1. The cake layer is peeled off from the inside of the filter cloth through the filtrate hole and the filter bridge, and the cake C is discharged to the outside through the chute 9. The part from which the cake layer has been peeled is washed with the washing solution from the filter cloth washing spray 8A, and then reaches the stock solution slurry F to perform the next filtration. In a series of filtrations, the filtration capacity can be increased by increasing the rotational speed of the rotary drum 1.

Incidentally, as shown in FIG. 4, the valve shoe 6 is formed by integrating the first valve shoe 6A and the second valve shoe 6B. The arc surface (sliding contact surface) of the lower surface of the valve shoe 6 and the rotary drum 1 are formed. A slit is formed between the inner peripheral surfaces. The valve bar 7 is formed by first and second valve bars 7A and 7B that support the first and second valve shoes 6A and 6B.

However, in a conventional pressurized rotary single-chamber filter, a part of the pressurized gas such as nitrogen gas circulated outside the rotary drum 1 is transferred from the filter cloth surface of the rotary drum 1 to the inside after the cake layer is peeled off. Although the valve shoe 6 is provided so as not to permeate, gas leakage is prevented. However, since there is a slit between the rotary drum 1 and the valve shoe 6, the circulating gas leaks from this slit. In addition, although the rotary drum 1 is formed in a cylindrical shape, it is difficult to form the inner peripheral surface of the rotary drum 1 in a perfect circle shape, and therefore, the thin inner surface of the rotating drum 1 and the arc surface of the valve shoe 6 are narrow. The gap is not constant, and the narrow and narrow gaps are repeated. Further, since the cake layer is separated from the rotary drum 1 at the portion facing the valve shoe 6, the circulating gas is easy to permeate from the filter cloth into the rotary drum 1. For reasons of the shape of the peripheral surface, the slit with the valve shoe 6 becomes wider, the amount of circulating gas leakage increases, and the replenishment amount of the pressurized gas must be increased accordingly. In addition, the upper portion of the valve shoe 6A is directly fixed to the upper valve bar 7A, and the lower valve shoe 6B connected and fixed to this is free at one end. There has been a problem that the lower valve shoe 6B is pushed inward of the rotary drum 1 to widen the gap between the inner peripheral surface of the rotary drum 1 and the amount of leakage of the circulating gas further increases.

Furthermore, since the amount of circulating gas leaked was large, the equipment provided in the gas circulation path was required to be relatively large, and there was a problem that the energy consumption was enormous. In addition, although this applicant has proposed the technique which suppresses clogging in the rotating drum 1 after peeling a cake layer from the rotating drum 1 by the blow from a hole in patent document 1, clogging is suppressed. On the other hand, the circulation gas increases. Moreover, the same subject also existed in the conventional pressure-reducing filter.

JP 2002-191912 A

The present invention has been made to solve the above-described problems, and can reduce the amount of circulating gas leakage, thereby reducing the energy consumption of the devices, and thus reducing the size of the devices. An object of the present invention is to provide a rotary single-chamber filter that can be promoted.

According to a first aspect of the present invention, there is provided a rotary single chamber type filter, wherein a rotary drum having a filter cloth stretched around an outer peripheral surface via a filter bridge is attached to a center pipe, and a lower part of the rotary drum is used as a stock bat. The stock slurry is immersed and subjected to pressure filtration or suction filtration, and the filtrate is led out of the machine by a filtrate tube connected to the center pipe, and is connected to the center pipe so as to communicate with the inner peripheral surface of the rotating drum. A rotary single-chamber filter that peels off and collects the cake layer formed on the outer surface of the filter cloth by a gas blown from a hole in the upper part of the valve shoe provided through a gap. It is characterized by comprising pressurizing means for pressing a sliding contact surface formed along the inner peripheral surface of the rotating drum against the inner peripheral surface of the rotating drum.

According to a second aspect of the present invention, in the rotary single-chamber filter according to the first aspect, the valve shoe has an upper surface opposite to the sliding contact surface connected to the center pipe. It is supported on the lower surface of the valve bar, and when the rotating drum rotates, the sliding contact surface is made to follow the inner peripheral surface of the rotating drum via the pressurizing means. is there.

According to a third aspect of the present invention, there is provided the rotary single chamber type filter according to the second aspect, wherein the pressurizing means includes a recessed portion formed on a lower surface of the valve bar, and the valve shoe. And a fluid that supplies a pressurized fluid into the sealed space through a hole formed in the recessed portion and forming a sealed space between the recessed portion and a hole formed in the recessed portion. And a supply means.

According to a fourth aspect of the present invention, in the rotary single-chamber filter according to the first aspect of the present invention, the valve bar and the center vip are connected by a support member according to any one of the first to third aspects. It is characterized by this.

According to the present invention, it is possible to reduce the amount of circulating gas leakage, reduce the energy consumption of the equipment, and thus promote the downsizing of the equipment. Machine can be provided.

(A), (b) is a figure which shows the principal part of the pressurization type rotary single-chamber filter which is one Embodiment of the rotary single-chamber filter of this invention, (a) is the figure Sectional drawing and (b) are sectional drawings which expand and show the part enclosed by the circle | round | yen shown by the arrow B of (a). (A), (b) is a figure which shows the principal part of the valve shoe of the rotary single chamber type filter shown in FIG. 1, (a) is the top view, (b) is the sectional drawing. It is sectional drawing which shows the structure of the conventional pressurization type rotary single chamber type filter. It is sectional drawing which shows the principal part of the rotary single chamber type filter shown in FIG.

DESCRIPTION OF SYMBOLS 1 Rotating drum 2 Center pipe 3 Stock solution vat 5 Filtrate tube 6 Valve shoe 6A 1st valve shoe 6B 2nd valve shoe 6B ₁ projection part 6C 3rd valve shoe 6C ₁ projection part 7 Valve bar 7A _1st valve bar 7A ₁ recess Part 7A ₂ supply hole 7B 2nd valve bar 7B ₁ recessed part 7B ₂ supply hole 11 Support member

Hereinafter, the rotary single-chamber filter of the present invention will be described based on the embodiment shown in FIG. 1 and FIG.

The rotary single-chamber filter according to the present embodiment includes, for example, a rotating drum 1, a center pipe 2, a stock solution bat 3, a casing 4, and a filtrate as shown in FIGS. 1 (a) and 1 (b). The tube 5, the valve shoe 6, the valve bar 7, the filter cloth cleaning spray 8 </ b> A, the cleaning spray 8 </ b> B, the cake discharge chute 9, and the gas supply unit 10 are configured as a pressurizing rotary single chamber filter. .

Thus, since the structure of the valve shoe 6 and the valve bar 7 is different in the rotary single-chamber filter of the present embodiment, the following is the same as the conventional one with the valve shoe 6 and the valve bar 7 used in the present embodiment as the center. Corresponding parts will be described with the same reference numerals.

The valve shoe 6 is formed of a synthetic resin having a small friction coefficient, such as a tetrafluoroethylene resin, as in the prior art, and is formed so as to be in sliding contact with the rotating drum 1 smoothly. As shown in FIG. 1A, the valve shoe 6 is divided into first, second, and third valve shoes 6A, 6B, and 6C, and the lower surfaces of the valve shoes 6 are the inner periphery of the rotary drum 1 in an initial state. It is formed as a circular arc surface that continues along the surface. Circular protrusions to be described later are formed on the upper surfaces of the second and third valve shoes 6B and 6C. Further, as shown in FIG. 1A, the valve bar 7 includes a first valve bar 7A corresponding to the first and second valve shoes 6A, 6B and a second valve bar corresponding to the third valve shoe 6C. It is divided into 7B. The first and second valve bars 7A and 7B are both formed in a flat plate shape, and reinforcing ribs are provided on the upper surfaces of the first and second valve bars 7A and 7B along the circumferential direction of the rotating drum 1 (hereinafter also referred to as “vertical direction”). A plurality are formed. As will be described later, the first valve shoe 6A is joined and integrated with the upper lower surface of the first valve bar 7A by a fastening member (not shown) such as a screw, and the second and third valve shoes 6B and 6C are integrated. Both are attached in a movable state so as to be movable back and forth with respect to the lower surfaces of the first and second valve bars 7A and 7B.

The first valve shoe 6A is joined and fixed to the upper part of the lower surface of the first valve bar 7A with a fastening member such as a screw as shown in FIG. The second valve shoe 6B is movably attached to the lower part of the lower surface of the first valve bar 7A. The arc surface of the first valve shoe 6A and the arc surface of the second valve shoe 6B are integrated with the lower surface of the first valve bar 7A as shown in FIG. It is formed as a circular arc surface that continues along the surface. A substantially uniform slit (about 0.2 to 0.3 mm) is formed between the continuous arc surface and the inner peripheral surface of the rotating drum 1, and the second valve shoe 6B rotates as described later. It projects to the drum 1 side so as to fill the slit. Further, as shown in FIG. 1A, the third valve shoe 6C is attached in a movable state over the entire lower surface area of the second valve bar 7B, and is configured according to the second valve shoe 6B. ing.

An inclined wall toward the center of the rotating drum 1 is formed at the lower end edge of the first valve bar 7A, and an inclined wall toward the center of the rotating drum 1 is formed at the upper end edge of the second valve bar 7B. The first valve bar 7A and the second valve bar 7B are integrated with each inclined wall via a fastening member 7D such as a bolt.

Furthermore, the second valve bar 7B has a lower end connected to the center pipe 2 via a rod-like support member 11, as shown in FIG. Thus, since the lower end portion of the valve bar 7 is supported by the support member 11, even if the pressure of the circulating gas is applied to the valve shoe 6 from the outside of the rotating drum 1, the valve shoe 6 is brought into the inside of the rotating drum 1 by the pressure. So that the slit is not enlarged.

Next, the relationship between the first and second valve shoes 6A and 6B and the first valve bar 7A will be described in more detail with reference to FIGS.

The upper central portion of the second valve shoe 6B, the lower surface of the first Barububa 7A with FIG. 2 (a), the circular flat projections 6B _1, for example, as shown in (b) is formed the circular recess 7A 1 _(the (b) see FIG. 1) is formed of projections 6B ₁ is fitted, so as to recess 7A ₁ with projections 6B ₁ functions as a piston to function as a cylinder It is. In a state where the arc surface of the first valve shoe 6A and the arc surface of the second valve shoe 6B are continuous without a step as shown in FIGS. 1A and 2B, the protrusion 6B ₁ The protrusion height from the upper surface of the second valve shoe 6B is lower than the upper surface of the first valve shoe 6A as shown in FIGS. 1B and 2B. Further, the first Barububa 7A of the upper part of the thickness and the concave portion 7A ₁ of the bottom thickness of the formed substantially the same thickness as shown in (b) of FIG. Therefore, when the first valve shoe 6A and the second valve shoe 6B shown in FIG. 2 (b) is projecting portion 6B ₁ attached to the lower surface of the first Barububa 7A is fitted into the concave portion 7A _1, FIG. 1 slit is formed between the bottom surface of the top and recess 7A ₁ of the protrusion 6B ₁ as shown in (b).

Further, O-ring 12 is attached to the peripheral surface of the protruding portion 6B ₁ of the second valve shoe 6B as shown in FIG. 1 (b), the protrusion 6B ₁ and recess 7A ₁ This O-ring 12 The gap formed between them is sealed to form a sealed space. Further, in FIG. 1 (a) and in FIG. 2 (a), the supply for supplying a pressurized gas into the enclosed space in the recess 7A ₁ of the first Barububa 7A as shown in (b) hole 7A ₂ As shown in FIG. 1 (a) by an arrow Y, a _second gas is supplied from the supply hole 6A2 to the sealed space as shown by a one-dot chain line in FIG. 2 (b). The shoe 6B moves forward from the first valve bar 7A toward the rotating drum 1, and the arc surface of the second valve shoe 6B is pressed against the inner peripheral surface of the rotating drum 1 to make elastic contact with the rotating drum. Follow the inner peripheral surface of 1. Here, the supply holes 7A ₂ is connected to the pipe via a (not shown) source of pressurized gas (not shown). These gas supply source, piping, protrusion 6B _{1 of} the second valve shoe 6B, and recess 7A ₁ of the first valve bar 7A are formed on the rotary drum 1 with the arc surface of the second valve shoe 6B as the sliding surface. It is comprised as a pressurization means for pressing on an inner peripheral surface and making it contact closely.

Elongated hole 7A ₃ for ejecting the blow gas is formed in the first Barububa 7A as shown by the two-dot chain line in FIG. 2 (a), the first valve shoe 6A along the long hole 7A ₃ a plurality of holes 6A ₁ is formed. Therefore, the blow gas is jetted toward the rotary drum 1 through a plurality of holes 6A ₁ of the first Barububa long hole 7A of 7A ₃ and the first valve shoe 6A. Further, the first valve shoe 6A holes 6A ₁ for fastening members such as screws are formed with a plurality of, first Barububa 7A internal thread these into a plurality of holes 7A ₄ on the top (not shown) Is formed.

Moreover, the 3rd valve shoe 6C and the 2nd valve bar 7B are comprised according to the 2nd valve shoe 6B and the 1st valve bar 7A, as shown to (a) of FIG. However, the third valve shoe 6C is formed so as to cover the entire lower surface area of the second valve bar 7B. Accordingly, as shown in FIG. 1A, the third valve shoe 6C is also provided with a circular projection 6C1 as in the case of the second valve shoe 6B, and the second valve bar 7B has a _first projection. Barububa 7A as well as recess 7B ₁ is formed. Projections 6C ₁ of the third valve shoe 6C is formed as a piston, recess 7B ₁ of the second Barububa 7B is formed as a cylinder.

Next, the operation of the rotary single chamber type filter of this embodiment will be described. Since the process until the stock slurry F is filtered and the cake layer is washed from the outside of the rotating drum 1 is the same as that of the prior art, the description thereof is omitted, and the valve shoe 6 and the valve bar when peeling the cake layer from the rotating drum 1 7 will be mainly described.

When the rotary drum 1 cake layer rotates and reaches the first valve shoe 6A, the blow gas is via a plurality of holes 6A ₁ of the first valve shoe 6A from the long hole 7A ₃ of the first Barububa 7A rotation It ejects toward the drum 1, and the cake layer of the rotating drum 1 is peeled off. Thus for the cake layer from the rotating drum 1 at the lower side of a plurality of holes 6A ₁ of the first valve shoe 6A is peeled off, the circulating gas is easily transmitted into the rotary drum 1.

Since the first valve shoe 6A is fixed to the first valve bar 7A, a slit is held between the first valve shoe 6A and the rotary drum 1, so that the circulating gas leaks from this portion. . However, since the narrow gap between the rotary drum 1 and the first valve shoe 6A is as narrow as about 0.2 to 0.3 mm, the amount of circulating gas leakage at the first valve shoe 6A is small.

The circulating gas also attempts to permeate the rotating drum 1 in the second and third valve shoes 6B and 6C below the first valve shoe 6A. However, the pressurized gas into the sealed space formed by the recessed portion 7A ₁ and the O-ring 12 from the supply hole 7A ₂ of the first Barububa 7A and the projection 6B ₁ of the second valve shoe 6B first Barububa 7A Since the gas is supplied, the pressurized gas advances the second valve shoe 6B toward the inner peripheral surface of the rotating drum 1, fills the slits, and is pressed against the inner peripheral surface of the rotating drum 1 so as to be in close contact with each other. Therefore, the leakage of the circulating gas is suppressed in this part. Note that the pressing force of the second valve shoe 6B does not act to the extent that the rotating drum 1 is braked. Similarly to the second valve shoe 6B, the third valve shoe 6C below the second valve shoe 6B is also provided with a pressurizing means. Therefore, the amount of circulating gas leaked from this portion is reduced to, for example, about 50%. As a result, the amount of circulating gas can be reduced by about 30%.

Since the leakage amount of the circulating gas can be reduced in this way, the energy consumption of the equipment used for circulating the pressurized gas can be reduced, or the downsizing of the equipment can be promoted.

In addition, when the high temperature raw slurry F is filtered using a conventional rotary single-chamber filter, preliminary operation is performed to heat the devices such as the rotating drum 1 to substantially the same temperature as the raw slurry F. If the rotary drum 1 or the like is not thermally expanded, the slit between the valve shoe 6 and the inner peripheral surface of the rotary drum 1 is wide, and a large amount of circulating gas may be leaked. Therefore, the time from the preliminary operation to the actual operation was wasted and the operation efficiency was poor.

On the other hand, in the present embodiment, the second and third valve shoes 6B and 6C can be brought into close contact with the inner peripheral surface of the rotating drum 1 at the same time as the operation is started. In addition to being able to operate and improve operating efficiency, it is possible to reliably suppress and prevent leakage of circulating gas from the slit between the valve shoe 6 and the inner peripheral surface of the rotary drum 1 from the initial stage of operation. Can do.

In the present embodiment, since the lower end portion of the second valve bar 7B is supported by the support member 11, the valve shoe 6 does not move to the inside of the rotary drum 1 due to the pressure of the circulating gas, and the second, The third valve shoes 6B and 6C can be brought into close contact with the inner peripheral surface of the rotary drum 1 in a stable state, and the amount of circulating gas leaked can be further reduced.

As described above, according to the present embodiment, the valve shoe 6 includes the pressurizing means for pressing the arc surface formed along the inner peripheral surface of the rotating drum 1 against the inner peripheral surface of the rotating drum. While the slurry F is filtered, the amount of circulating gas leaked into the rotary drum 1 at the valve shoe 6 can be significantly reduced. Moreover, since the leakage amount of circulating gas can be reduced, the energy consumption of the equipment for circulating the circulating gas can be reduced, or the downsizing of the equipment can be promoted.

Further, according to the present embodiment, the pressurizing means includes the recessed portions 7A ₁ and 7B ₁ formed on the lower surfaces of the first and second valve bars 7A and 7B, and the second and third valve shoes 6B, Protrusions 6B ₁ , 6C ₁ formed on the upper surface of 6C and fitted into the recessed portions 7A ₁ , 7B _{1 so as} to be movable back and forth to form a sealed space between the recessed portions 7A ₁ , 7B ₁ , And a gas supply source for supplying pressurized gas into the sealed space from the supply holes 7A ₂ and 7B ₂ respectively formed in the recessed portions 7A ₁ and 7B _1. The amount of circulating gas leakage can be greatly reduced.

Further, according to the present embodiment, since the lower end portion of the second valve bar 7B is supported by the support member 11, the second and third valve shoes 6B and 6C are more stable in the rotary drum 1. It can be brought into close contact with the peripheral surface, and the amount of circulating gas can be further reduced.

In the above embodiment, the pressurized gas is supplied to the sealed space formed by the protrusion, the recessed portion and the O-ring as the pressurizing means, but the present invention is limited to such a pressurizing means. For example, a pressurized liquid may be supplied instead of the pressurized gas, and an elastic member such as a spring member may be interposed between the valve shoe and the valve bar. The arcuate surface (sliding contact surface) of the valve shoe may be always pressed against the inner peripheral surface of the rotary drum by a material that itself has elasticity, and the sliding contact surface may be formed of a material having a small friction coefficient. Moreover, although the said embodiment demonstrated the pressurization type rotary single chamber type filter, it can apply similarly to a pressure reduction type rotary single chamber type filter.

The rotary single-chamber filter of the present invention can be used in many fields such as general chemical industry, fertilizer industry, metal industry and food industry.

Claims (4)

1. A rotating drum with a filter cloth stretched on the outer peripheral surface through a filter bridge is attached to the center pipe, the lower part of the rotating drum is immersed in a stock solution vat, and the stock solution slurry is pressure filtered or suction filtered, and the filtrate is fed to the center pipe. By a gas blown from a hole in the upper part of the valve shoe, which is led out of the machine by a connected filtrate pipe, connected so as to communicate with the center pipe, and provided between the inner peripheral surface of the rotary drum and a slit. A rotary single-chamber filter for peeling and collecting a cake layer formed on the outer surface of the filter cloth, wherein the valve shoe has a sliding contact surface formed along an inner peripheral surface of the rotary drum as described above. A rotary single-chamber filter having pressurizing means for pressing against an inner peripheral surface of a rotary drum.
2. The valve shoe has an upper surface opposite to the sliding contact surface supported by a lower surface of a valve bar connected to the center pipe, and when the rotating drum rotates, the rotating drum rotates through the pressurizing means. The rotary single-chamber filter according to claim 1, wherein the sliding contact surface follows the inner peripheral surface.
3. The pressurizing means includes a recessed portion formed on the lower surface of the valve bar, a protrusion formed on the upper surface of the valve shoe and fitted into the recessed portion to form a sealed space between the recessed portion, The rotary single-chamber filter according to claim 2, further comprising fluid supply means for supplying a pressurized fluid into the sealed space from a hole formed in the recessed portion.
4. The rotary single-chamber filter according to any one of claims 1 to 3, wherein the valve bar and the center vip are connected by a support member.

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