JP3237934B2 - Filtration and drying equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration and drying apparatus used for filtering and drying a slurry-like stock solution in a manufacturing process of pharmaceuticals and the like to extract a dried cake.

[0002]

2. Description of the Related Art A specific example of the above-mentioned filtration and drying apparatus is described in, for example, Japanese Patent Application Laid-Open No. 61-21708. In the apparatus, as shown in FIG. 9, a filter plate 72 is provided on the bottom side of a filter device main body 71, and a slurry-like stock solution injected from the top of the main body 71 is filtered by the filter plate 72. The filtrate is supplied to the bottom plate 7 covering the lower side of the main body 71.
The liquid is discharged to the outside of the main body 71 through a liquid drain pipe 74 provided in the apparatus 3.

[0003] The cake on the filter plate 72 generated by the above-described filtration treatment is then washed by spraying a washing liquid from above the main body 71 in a shower shape, and further dried by supplying a drying gas. The dried cake is
By lowering the stirring blades 75 provided in the main body 71 while rotating, the stirring blades 75 are gathered at the center of the main body 71, pass through the center of the filter plate 72 and the bottom of the bottom plate 73, and extend downward through a cake discharge pipe 76. Collected outside. The cake discharge pipe 76 is provided with an on-off valve 77 that is kept closed during the filtration / drying process and is opened during recovery.

By the way, in the structure in which the cake discharge pipe 76 is provided at the center of the filter plate 72 as described above, this portion cannot be formed as a filtration region, and the effective filtration area is reduced by that amount, and the filtration efficiency is reduced. . For this reason, as shown in FIG. 10, for example, a filtration / drying apparatus having a structure in which a cake discharge port 83 covered with a detachable sealing lid 82 is provided on a side portion of a main body 81 is conventionally known. In such a device, it is possible to provide a filter plate 85 on the bottom plate 84, which is almost equivalent to the entire cross section inside the main body 81, so that a wide filtration area can be obtained and the filtration efficiency is improved.

[0005] In the above-described apparatus, when the undiluted solution is injected into the main body 81 and filtration and drying are performed in substantially the same manner as in the above-described conventional example, the sealing lid 82 is removed and the cake collection chute (not shown) is removed. It is attached to the cake outlet 83. Then, the cake deposited on the filter plate 85 is scraped out by rotating and lowering the stirring blade 86, whereby the cake is passed through the cake outlet 83 to the above-mentioned cake collection chute. Discharged and collected.

In the above-described apparatus, the filter plate 85 on the bottom plate 84 fastened to the main body flange 81a at the lower end of the main body 81 fits the thin filter material 85a to the inner peripheral surface of the main body 81. It is formed in a structure of being supported by a substantially cylindrical filter medium support member 85b, thereby forming the filter medium 85a.
, That is, the filtration surface is positioned at a height slightly above the lower edge of the cake discharge port 83 above the main body flange 81a. In other words, in a configuration in which the filtration surface is located below the cake discharge port 83, the cake discharge port 83 is discharged when the cake deposited on the filtration surface is discharged.
The cake that cannot pass through the lower edge remains partially in the main body 81, and the cake collection efficiency is reduced. Therefore, by setting the height relationship between the filtration surface and the cake discharge port 83 as described above, the cake can be collected with good collection efficiency.

On the other hand, in the above-described structure, when the bottom plate 84 is assembled to the main body 81 from below, the filter plate 85 and the inner wall surface of the main body 81 into which the filter plate 85 is inserted from below are formed to prevent abrasion or the like. As shown in FIG. 11, a predetermined fitting gap d is provided between the inner wall surface of the main body 81 and the filter medium supporting member 85b.

[0008]

However, in the above device, the inner wall surface of the main body 81 and the filter medium supporting member 85 are not provided.
b, it is necessary to provide a predetermined fitting gap d, so that the undiluted solution, the cleaning liquid, and the like injected into the main body 81 remain in the above-mentioned gap d, which deteriorates with time and becomes As a result, there is a problem that sufficient cleanliness cannot be maintained.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to improve the cleanliness by reducing the residual liquid in the main body, and to further improve the cleanliness.
An object of the present invention is to provide a filtration and drying apparatus capable of improving cake collection efficiency.

[0010]

In order to achieve the above object, a filtration and drying apparatus according to claim 1 of the present invention comprises a thin plate-shaped filter medium on a bottom plate which covers a lower end opening of a main body from below. ,
A filter / drying device comprising a filter plate having a cylindrical filter material support member for supporting the periphery of the filter material, wherein the filter plate is inclined downwardly at the outer peripheral corner of the upper surface of the filter material support member. A pressed surface is formed, and on the inner wall surface on the lower end side of the main body, the filter plate inserted from below into the main body when the bottom plate is attached to the lower end portion of the main body. A pressing surface inclined at the same inclination angle as the pressed surface is formed so as to be in close contact over the entire circumference, and
A cake discharge port that penetrates the lower end wall surface of the main body in a lateral direction at a position above the pressing surface, the inner peripheral side of the wall surface at the lower edge portion between the upper surface of the filter medium supporting member and the pressed surface. Are provided so as to substantially coincide with the height positions of the corners.

According to a second aspect of the present invention, in the filtration and drying apparatus according to the first aspect, the lower edge portion of the cake discharge port is provided so as to be inclined downward from the inner peripheral side to the outer peripheral side of the main body wall. It is characterized by having.

[0012]

According to the first aspect of the present invention, there is provided a filtration and drying apparatus.
The outer periphery of the filter medium supporting member is mounted inside the main body with the pressed surface on the upper surface side being in close contact with the pressing surface formed on the inner wall surface of the main body, and a gap is provided between the filter medium supporting member and the main body inner wall surface. Does not occur. For this reason, the remaining of the liquid that has occurred between the conventional filter medium support member and the inner wall surface of the main body is eliminated, thereby improving the cleanliness inside the main body.

On the other hand, in the above description, the cake discharge port is arranged such that the inner peripheral side of the wall surface at the lower edge portion is located at the height of the corner between the upper surface of the filter medium supporting member and the pressed surface, that is, the filter plate. It is provided so as to match the height position of the upper surface. In other words, in order to secure a pressing surface that adheres to the upper surface of the filter medium supporting member from above also below the cake discharge port that penetrates the body wall surface in the lateral direction, the cake is placed at a position above this pressing surface. Although it is necessary to provide a discharge port, since the pressing surface is inclined, even if the cake discharge port is provided at the position as described above,
On the lower side of the cake discharge port, it is possible to form a pressing surface that is in close contact with the pressed surface of the filter medium supporting member, and by having such a configuration, the filter medium supporting member and the inner wall surface of the main body can be formed. Can be brought into close contact over the entire circumference. Therefore, the cleanliness is not impaired, and there is no step between the upper surface of the filter plate and the lower edge of the cake discharge port, and no cake remains when the cake is discharged. It can be.

[0014] In the filtration and drying apparatus according to the second aspect,
In order to provide an inclined pressing surface in close contact with the pressed surface of the filter medium supporting member from above, the lower end side of the main body has a thick wall structure, so that the length of the cake discharge port is somewhat longer. However, since the lower edge portion is inclined, the cake discharged from the main body falls along the inclined surface. Therefore, even when the length of the cake outlet is increased according to the thickness of the wall surface as described above, the remaining of the cake on the lower edge portion can be minimized. Recovery efficiency can be improved.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 3, the filtration and drying apparatus of this embodiment includes a main body 1 for filtering and drying a slurry stock solution and a cake collecting chute for collecting cake discharged from the main body 1 after filtration and drying. (Hereinafter, abbreviated as a chute) 2.

The main body 1 is provided with a bell jar-shaped main body wall portion 3 in which a cylindrical main body body plate 3a and an upper end plate 3b are integrally connected. ,
A bottom plate 4 that covers the opening from below is attached. A jacket body plate 3c is provided concentrically outside the body body plate 3a except for the mounting portion of the chute 2, and the body 1 is provided between the jacket body plate 3c and the body body plate 3a.
When it is necessary to maintain the inside at a predetermined temperature, a heating or cooling medium circulation flow path 3 through which a heating or cooling medium is circulated.
d is formed. The lower end of the main body wall 3 is
The bottom plate 4 is formed as a ring-shaped bottom plate mounting portion 5 to be screwed from below, and the lower end of the main body plate 3a is provided on the inner peripheral side of the upper surface of the bottom plate mounting portion 5, and the jacket body plate is provided on the outer peripheral side of the upper surface. The lower ends of 3c are joined.

A substantially disc-shaped filter plate 6 is horizontally mounted on the bottom side of the main body 1, and a stirring blade 7 is disposed above the filter plate 6. The stirring blade 7 is attached to a lower end of a stirring shaft 7a vertically penetrating the center of the upper head plate 3b. The stirring shaft 7a is supported by a stirring blade driving unit 8 provided above the upper head plate 3b. Have been.

The stirring blade driving unit 8 covered with the driving unit cover 9 has a stirring shaft 7a rotatable and vertically movable at a position close to the upper head plate 3b while maintaining airtightness in the main body 1. Is provided with a mechanical seal portion 8a for supporting
In addition, a stirring shaft 7 is provided above the mechanical seal portion 8a.
a is provided with a hydraulic motor 8b for rotationally driving a. Further, as shown in FIG. 4, hydraulic blade cylinders 8c, 8c for stirring blades for vertically moving the stirring shaft 7a are provided, and by operating these hydraulic cylinders 8c, 8c,
As shown in FIG. 3, the stirring blade 7 moves up and down between a lower limit position close to the upper surface of the filter plate 6 from above and an upper position indicated by a two-dot chain line in the figure. In order to prevent the lubricating oil, dust and the like from being scattered into the main body 1 from the stirring shaft 7a which is rotated and moved up and down while sliding in the stirring blade driving section 8, the stirring blade driving section in the main body 1 is used. 8 and the stirring blade 7
A bellows 7b is provided to extend and retract around the stirring shaft 7a. The bellows 7b is made of a heat and corrosion resistant material such as stainless steel.

As shown in FIG. 5, a stock solution supply pipe 11, a drying gas supply pipe 12, cleaning liquid supply pipes 13, and a steam supply pipe 14 are attached to the upper end plate 3b around the drive section cover 9. Through these, a slurry-like undiluted solution, a drying gas such as nitrogen gas or air, a cleaning liquid, and pure steam for sterilizing the inside of the main body 1 are supplied into the main body 1 respectively. In addition, the upper end plate 3b includes
Upper viewing window 15 for viewing the inside of main body 1 from above
Etc. are further provided.

On the other hand, a supply pipe 16a and a discharge pipe 16 for externally circulating a heating or cooling medium through the heating or cooling medium circulating passage 3d are provided on the outer surface of the jacket body plate 3c.
b, and two mounting arms 17 are attached to opposing portions in such a manner as to extend horizontally horizontally. As shown in FIG. 4, column-shaped main body legs 18 extending downward as shown in FIG. 4 are respectively connected to the distal ends of the installation arms 17 so that the main body 1 is at a predetermined height from the installation floor surface. Held in a raised position.

As shown in FIGS. 6 (a) and 6 (b), the filter plate 6 disposed on the bottom side in the main body 1 has a ring-shaped filter plate ring member (filter material support member) 21. It is formed with a structure in which a thin filter material 22 is stretched so as to cover the upper opening. Further, inside the filter plate ring body 21, ribs 23 for supporting the filter medium 22 from below are provided in a lattice shape.

The filter medium 22 is made of a porous material having an average pore diameter of about 5 μm, for example, a sintered body of stainless steel (SUS316), and is formed in a thin plate having a thickness of about 2 mm. On the other hand, as shown in FIG. 7, on the upper surface of the filter plate ring body 21, there is formed a filter material mounting surface 21a having a shape recessed downward while slightly leaving the outer peripheral side. The filter medium 22 has a state in which the outer peripheral side is fitted into the filter medium mounting surface 21a from above,
The outer peripheral end is joined to the filter plate ring body 21 by welding, and the filter medium 22 is finished so that the upper end surface on the outer peripheral side of the filter plate ring body 21 is flush.

In the above structure, a surface area of the filter medium 22 inside the inner peripheral surface of the filter plate ring 21 is a filtration area through which the liquid can flow downward from above through the filter medium 22. And in the above, the filter plate ring body 21
In order to form a filtration area on the lower surface of the filter medium 22, a filter area forming groove is further recessed on the filter medium mounting surface 21a so that a filter area is formed outside the inner peripheral surface of the filter medium. 2
1b, and a filtrate recovery groove 21c extending from the filtration area forming groove 21b to the inner peripheral surface of the filter plate ring body 21 is formed. The bottom surfaces of the grooves 21b and 21c are formed in a shape integrally connected and inclined downward inward. As shown in FIG. 6 (a), the filtration area forming groove 21b is formed in a circular shape over the entire circumference of the filter plate ring body 21, and the filtrate recovery grooves 21c. They are provided radially at intervals.

The outer peripheral side of the upper surface of the filter plate ring 21 is
As shown in FIG. 7, a tapered surface 21d having a taper angle of about 45 ° is formed, and the pressed surface 21d is provided with an O-ring groove 21e in an annular shape. on the other hand,
As shown in FIG. 6 (a), a filter plate mounting screw hole 2 drilled upward is formed on the lower end surface of the filter plate ring body 21.
Are formed at appropriate intervals in the circumferential direction.

As shown in FIG. 3, the bottom plate 4 has an annular bottom plate ring 24 on the outer peripheral side thereof.
4, a lower end plate surface 25 whose center side is curved downward.
Are formed continuously. A filtrate discharge pipe 26 communicating with the inside of the main body 1 and extending downward is provided at a central portion of the lower end plate surface 25, and around the filtrate discharge tube 26 on the lower surface of the lower end plate surface 25, At the lower end, four bottom plate legs 27 each having casters 27a are attached.

The bottom plate 4 having the above-mentioned shape is attached to the bottom plate attaching portion 5 at the lower end of the main body wall 3 with the filter plate 6 placed on the upper surface thereof from below. The structure will be described with reference to FIG.

As shown in the figure, the inner peripheral surface of the bottom plate mounting portion 5 is located at the lower end of the inner peripheral surface of the main body plate 3a.
A two-step taper surface of a downwardly expanding shape, that is, a two-step taper surface of a taper pressing surface 5a having a taper angle of about 45 ° and a taper fitting surface 5b having a taper angle of about 3 ° are sequentially formed. It is formed in a continuous shape. The lower end of the main body body plate 3a is welded to the inner peripheral side of the upper end of the bottom plate mounting portion 5, so that the welding joint strength is not reduced by the taper processing for forming the tapered pressing surface 5a. The tapered pressing surface 5a is provided at a position slightly lower than the welding line of the main body body plate 3a to the bottom plate mounting portion 5. As a result, the upper end of the tapered pressing surface 5a has a shape protruding slightly toward the center from the inner peripheral surface of the main body plate 3a as an inward projection 5c.

On the other hand, the bottom plate ring body 24 of the bottom plate 4 is
A filter plate mounting portion 24a having a substantially rectangular cross-sectional shape, and a flange portion 2 extending radially outward at a lower end side of the filter plate mounting portion 24a.
4b. Filter plate mounting part 2
4a has an inner and outer diameter corresponding to the filter plate ring body 21. Therefore, the filter plate 6
The filter plate mounting screw 28 is placed on the upper surface of the filter plate mounting portion 24a, and the distal end portion of the filter plate fastening screw 28 inserted from below the filter plate mounting portion 24a is screwed into the filter plate mounting screw hole 21f of the filter plate ring body 21. Thereby, it is fixed on the bottom plate 4.

The bottom plate 4 to which the filter plate 6 is fixed as described above
Is a bottom plate fastening screw 29 which is inserted through the flange portion 24b with the filter plate mounting portion 24a fitted from below into the tapered fitting surface 5b of the bottom plate mounting portion 5 of the main body wall portion 3.
Thereby, it is fastened and fixed to the lower end surface of the bottom plate mounting portion 5.
In this fixed state, the pressed surface 21d on the upper surface outer peripheral side of the filter plate 6 is in close contact with the tapered pressing surface 5a of the bottom plate mounting portion 5 from below, and the pressed surface 21d is lower than the tapered pressing surface 5a. The shape of the filter plate ring body 21 of the filter plate 6 and the shape of the bottom plate ring body 24 of the bottom plate 4 with respect to the vertical dimension of the bottom plate mounting portion 5 are set so that the pressing force in the direction acts. In this state, the upper surface of the filter plate 6 is set so as to be flush with the upper surface of the inward projection 5c at the upper end of the bottom plate mounting portion 5.

As shown in FIG. 5, four bottom plate elevating cylinders 44 are attached to the outer periphery of the main body wall 3 in the vertical direction. As shown in FIG. 3, a main body 1 is provided at each lower end of the bottom plate lifting cylinders 44.
, Each of which is directed toward the center of the bottom plate, is mounted on the bottom plate support 44a.
Is placed. As a result, the bottom plate fastening screw 2
By operating the bottom plate elevating cylinders 44... In a state in which the bottom plate 9 is removed, the bottom plate 4 is lowered from the position of fastening to the lower end of the main body wall 3.

On the other hand, as shown in FIG. 1, a cake opening 31 having a circular opening shape is formed in the main body wall 3 so as to penetrate the bottom wall of the main body wall 3 in the lateral direction. Have been. The cake discharge port 31 is provided at a position where the lower edge portion thereof is flush with the upper surface of the filter plate 6 so as to coincide with the upper end surface of the bottom plate mounting portion 51. The chute casing 32 of the chute 2 is attached to the main body plate 3a so as to cover the cake discharge port 31 from the side.
The inside of the chute casing 32 is formed as a cake collection chamber 33 communicating with the inside of the main body 1 through the cake discharge port 31, and a cake outlet 32 a is provided at a lower end of the chute casing 32. This cake outlet 3
A detachable cap 34 that functions as a blind cover except when the cake is removed is attached to 2a.

A lid opening / closing unit casing 35 is further attached to the chute casing 32 at a position on the side opposite to the cake discharge port 31. In the lid opening / closing unit casing 35, as shown in FIG. A lid opening / closing hydraulic cylinder 36 is provided in the portion, and guide rods 37 are provided on both sides of the lid opening / closing hydraulic cylinder 36, respectively.

The guide rods 37, 37 and the cylinder rod 36a of the lid opening / closing hydraulic cylinder 36 shown in FIG. 1 extend through the chute casing 32 and extend inside the cake recovery chamber 33 toward the main body 1 side. An opening / closing lid 38 for opening and closing the cake discharge port 31 is attached to a tip end of the opening. The opening / closing lid 38 is driven horizontally by the lid opening / closing hydraulic cylinder 36 in the cake collecting chamber 33 in a direction of coming and going with respect to the cake discharge port 31. Note that the cylinder rod 36a of the lid opening / closing hydraulic cylinder 36 and the guide rod 37.3
Reference numeral 7 denotes a bellows 36b, 37a, 37a (see FIG. 2) made of a heat-resistant and corrosion-resistant material such as a stretchable stainless steel plate provided between the opening / closing lid 38 and the chute casing 32, respectively. Thus, the surface of the cylinder rod 36a and the surfaces of the guide rods 37 are not exposed in the cake recovery chamber 33.

As shown in FIG. 1, a tapered valve portion 38a having a diameter smaller toward the body 1 is provided on the body 1 side of the opening / closing lid 38. The cake discharge port 31 is formed on the main body 1 side with a tapered valve seat surface 31a in which the distal end side of the valve portion 38a is fitted over the entire circumference. Thereby, the lid opening / closing hydraulic cylinder 36 is operated to advance the opening / closing lid 38, and the valve portion 38a is moved to the valve seat surface 31a.
, The cake discharge port 31 is closed. Note that, for example, PFA (Tetrafluoroethylen
e-perfluoroalkylether copolymer) lining 38b is provided, whereby the valve portion 38a and the valve seat surface 31 are provided.
In addition to maintaining good sealing performance in the state of contact with the surface a, the powder attached to the surface of the opening / closing lid 38 can be easily removed.

The valve seat surface 3 at the cake discharge port 31
The cake collection chamber 33 side than 1a is formed as a tapered separation portion 31b slightly larger in diameter than the valve portion 38a,
It opens to the cake collection chamber 33 side. Thereby, the lower edge of the cake discharge port 31 has a shape that is entirely inclined downward from the inner peripheral surface side of the main body 1 toward the cake collection chamber 33 side. In the closed state, the separation portion 31b
Has a shape slightly separated from the outer peripheral surface of the opening / closing lid 38, and an outlet of an outlet blow pipe 39 for guiding air from the outside and jetting the air is opened at the separated portion 31b.

On the other hand, as shown in FIG. 2, on the inner peripheral surface of the chute casing 32, a central lid opening / closing hydraulic cylinder 3 is provided.
For example, five in-chute blow nozzles 41... In which the injection direction can be adjusted are provided so as to surround the cylinder rod 36 a of No. 6, and air is injected into the injection gas introduction pipe 42 provided on the outer surface of the chute casing 32. When supplied, the blow nozzles 4 in each chute pass through a gas guide path 43 (see FIG. 1) along the outer surface of the chute casing 32.
Air is guided to the nozzles 1 and is injected into the chute casing 32 from the nozzles 41.

In the filtration / drying apparatus having the above configuration, first,
An operation state in the filtration drying process will be described. When performing this process, as shown in FIG. 3, the bottom plate 4 on which the filter plate 6 is mounted is fixed to the bottom of the main body wall 3, and the opening / closing lid 38 of the chute 2 is positioned at the forward position. Then, the cake discharge port 31 is closed. On the other hand, the stirring blade 7 is located at an upper position indicated by a two-dot chain line in the figure.

In this state, when a predetermined amount of the slurry-like stock solution is injected into the main body 1 through the stock solution supply pipe 11, the stock solution is filtered by the filter medium 22. The filtrate flowing down through the filter medium 22 is supplied to the filtrate discharge pipe 2 of the bottom plate 4.
The liquid is discharged from the main body 1 through 6 and sent to a filtrate collection tank (not shown).

In this filtration, the filtration is performed not only in the area inside the inner peripheral surface of the filter plate ring body 21 in the filter medium 22 but also in the peripheral side of the filter plate ring body 21 in the upper portion of the filtration area forming groove 21b. Then, the filtrate flows to the space inside the inner peripheral surface of the filter plate ring body 21 through the filtration area forming groove 21b and the filtrate recovery groove 21c. As described above, the filtration is performed also in the region on the filter plate ring body 21 and the effective filtration area is widened, so that the filtration can be completed in a shorter time and efficient filtration is performed.

When the above-mentioned filtration process is substantially completed, a powder deposit, a so-called cake, remains on the filter plate 6.
Then, the cleaning liquid subjected to the dust-free and aseptic treatment is supplied in a shower shape into the main body 1 through the cleaning liquid supply pipe 13,
Thereby, the cake is washed. Thereafter, a dust-free and sterile nitrogen gas or air heated to a predetermined temperature is supplied from above to the main body 1 through the drying gas supply pipe 12, and the cake and the filter material 2 on the filter plate 6 are supplied.
2 and is discharged from the filtrate discharge pipe 26 to the outside of the main body 1. By continuing this hot air blowing for a predetermined time, the cake is dried.

After the above-described drying process is completed, the process proceeds to a process of collecting cake from the main body 1. At this time, the cap 34 is removed from the cake outlet 32a at the lower end of the chute 2,
Instead of the cap 34, the cake outlet 32a
For example, a collection bag made of a polyethylene sheet or the like is mounted. Then, the lid opening / closing hydraulic cylinder 36 is operated to retreat the opening / closing lid 38 and open the cake discharge port 31. At the same time, the rotation of the stirring blade 7 starts,
Lower gradually from the upper position. When the stirring blade 7 reaches the position of the cake on the filter plate 6, the cake is scraped laterally from its upper layer side, and thereby discharged through the cake discharge port 31 into the chute 2. The cake discharged into the chute 2 falls under its own weight in the chute casing 32 and is collected in the collection bag attached to the cake outlet 32a.

When the stirring blade 7 is lowered to the lower limit position and the collection of the cake in the main body 1 is completed, the inner surface of the chute casing 32 in the chute 2 and Dust-free and sterile air is injected through the above-described chute blow nozzle 41 in order to peel off the powder adhering to the outer surface of the opening / closing lid 38 and the bellows 36b / 37a. As a result, the powder separated from the surface of the chute casing 32 falls in the direction of the cake outlet 32a and is collected in the collection bag in the same manner as described above.

In collecting the cake as described above, the cake discharge port 31 is provided at a height position such that the inner end of the lower edge thereof coincides with the upper surface of the filter plate ring body 21. Therefore, since there is no step between the upper surface of the filter plate 6 and the lower edge of the cake discharge port 31, all cake on the filter plate 6 is discharged through the cake discharge port 31 without being left in the main body 1. can do. Further, the cake discharge port 31 is provided on a wall surface that is thicker than the thickness covering the pressed surface 21d of the filter plate ring body 21 and has a long shape. , The cake falls along this inclination. Therefore, the cake is hardly left on the lower edge of the cake discharge port 31, so that the cake can be collected with good collection efficiency.

When the collection of the cake is completed, the opening / closing lid 38 is moved forward to close the cake discharge port 31.
The processing from the injection of the undiluted solution into the main body 1 is repeated. In addition,
As described above, the lid 38 is advanced to move the
Air blow through the outlet blow pipe 39 is performed until immediately before the is closed. At this time, the air jetted from the jet port of the discharge port blow pipe 39 flows along the tapered gap between the outer peripheral surface of the opening / closing lid 38 on the valve portion 38a side and the inner peripheral surface of the cake discharge port 31. It will flow into the main body 1 spirally over the circumference. If the powder adheres to the surfaces of the valve portion 38a and the valve seat surface 31a at the cake discharge port 31, the powder is removed and sent into the main body 1 by this air flow. Moreover, as the opening / closing lid 38 approaches the valve closing state,
Since the space between the gaps is reduced, the flow velocity of the blow air is increased, so that it is possible to more reliably remove the adhering powder, and the close contact between the valve portion 38a and the valve seat surface 31a in the closed state thereafter. The sealing property on the surface is reliably maintained.

Before performing the above-mentioned filtration and drying treatment, pure steam is supplied into the main body 1 and the chute 2 through the steam supply pipe 14 and the blow nozzle 41 in the chute to sterilize the inside of the apparatus. As a result, the inside of the filtration and drying apparatus can be maintained with a high degree of cleanliness.

As described above, in the above embodiment, in particular, the filter plate ring body 21 of the filter plate 6 mounted on the bottom plate 4 is provided with a tapered pressed surface 21d. The ring body 21 is fixed to the tapered pressing surface 5 of the main body wall 3.
The filter plate 6 is assembled into the main body 1 in a state where the filter plate 6 is sandwiched between the filter plate 6 and the bottom plate 4. There is no gap between them. For this reason, the contamination caused by the residual liquid which has conventionally occurred in the fitting gap at this portion is eliminated, and the processing apparatus has high cleanliness.

On the other hand, the cake discharge port 31 is formed so that its lower edge is flush with the upper surface of the filter plate 6.
The amount of cake remaining when the cake is discharged by the stirring blade 7 is also reduced as much as possible, thereby improving the cake collection efficiency. Further, the cake discharged to the cake discharge port 31 has a lower edge portion of the cake discharge port 31 inclined in the thickness direction of the wall surface, and falls along the inclination.
Even if the cake discharge port 31 has a long length, the cake does not remain in this portion, so that good cake collection efficiency can be maintained.

Further, a chute 2 having an opening / closing lid 38 for opening / closing the cake discharge port 31 is attached to the cake discharge port 31. When the filtration / drying process in the main body 1 is completed,
Subsequently, the opening / closing lid 38 is opened so that the cake can be collected from inside the main body 1. As a result, workability is greatly improved, and in particular, since filtration and drying treatment to recovery are performed in a closed system that does not come into contact with the external atmosphere, this also contributes to cleanliness. Production of high quality products.

The above-mentioned chute 2 has an in-chute blow nozzle 41 for injecting pure steam and a cylinder rod 36 of a hydraulic cylinder 36 for opening and closing the lid.
Since the sliding parts in the cake recovery chamber 33 such as the a and the guide rod 37 are surrounded by the bellows 36b and 37a, the inside can be sterilized while being attached to the main body 1, As a result, workability such as sterilization can be greatly improved, and high cleanliness can be maintained.

[0050]

As described above, the filter and drying apparatus according to the first aspect of the present invention has a downwardly extending shape formed at the outer peripheral corner of the upper surface of the cylindrical filter medium supporting member that supports the periphery of the thin filter medium. A pressed surface is formed which is inclined at the lower end of the main body, and is pressed against the filter medium supporting member of the filter plate inserted from below into the main body when the bottom plate is attached to the lower end of the main body. In order to adhere to the surface over the entire circumference from above, a pressing surface inclined at the same inclination angle as the pressed surface is formed, and the lower end side wall surface of the main body is laterally positioned at a position above the pressing surface. The cake discharge port which penetrates is provided such that the inner peripheral side of the wall surface at the lower edge portion thereof is substantially aligned with the height position of the corner between the upper surface of the filter medium supporting member and the pressed surface. .

Thus, the outer periphery of the filter medium supporting member is mounted inside the main body with the pressed surface on the upper surface thereof being in close contact with the pressing surface formed on the inner wall surface of the main body. There is no gap between the wall and the wall where the liquid remains, thereby improving the cleanliness inside the main body. In addition, since the cake discharge port has a configuration in which the lower edge thereof is aligned with the height of the upper surface of the filter plate, no cake remains when the cake is discharged, and as a result, the cake collection efficiency is improved. This has the effect of being able to achieve

The filter drying apparatus according to the second aspect of the present invention is configured such that the lower edge of the cake discharge port is provided so as to be inclined downward from the inner peripheral side to the outer peripheral side of the main body wall.

Thus, even if the length of the cake discharge port provided at this portion becomes long, the lower edge portion of the main body has a thick wall surface structure. The remaining cake is minimized, and as a result, there is an effect that the collection efficiency of the cake can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing a cake discharge port side in a filtration and drying apparatus according to one embodiment of the present invention.

FIG. 2 is a partially cutaway side view showing a cake discharge port side in the filtration and drying apparatus.

FIG. 3 is a longitudinal sectional view showing the overall configuration of the filtration and drying apparatus.

FIG. 4 is a partially cutaway side view of the filtration and drying apparatus.

FIG. 5 is a partially cutaway plan view of the filtration and drying apparatus.

FIGS. 6A and 6B show a filter plate incorporated in the filtration and drying apparatus, wherein FIG. 6A is a plan view and FIG. 6B is a longitudinal sectional view.

FIG. 7 is an enlarged sectional view showing a structure on an outer peripheral side of the filter plate.

FIG. 8 is a partial cross-sectional view showing an attachment structure of a bottom plate and a filter plate to a main body wall portion in the filtration and drying apparatus.

FIG. 9 is a longitudinal sectional view showing a conventional filtration and drying apparatus.

FIG. 10 is a partial cross-sectional view showing another conventional filtration and drying apparatus.

11 is a partially enlarged cross-sectional view showing a structure for attaching a bottom plate and a filter plate to a main body in the conventional filtration and drying apparatus shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 4 Bottom plate 5a Pressing surface 6 Filtration plate 21 Filter plate ring body (filtering material support member) 21d Pressed surface 22 Filtering material 31 Cake outlet

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B01D 29/01-29/05 B01D 29/94

Claims (2)

(57) [Claims] 1. A bottom plate covering a lower end opening of a main body from below,
What is claimed is: 1. A filtration / drying apparatus comprising: a filter plate having a thin filter material and a cylindrical filter material support member for supporting a periphery of the filter material. A pressed surface inclined in a downwardly spreading shape is formed on the inner surface of the lower end of the main body, and the filter medium support of the filter plate inserted from below into the main body when the bottom plate is attached to the lower end of the main body. A pressing surface inclined at the same inclination angle as the pressed surface is formed so as to be in close contact with the pressed surface of the member over the entire circumference from above, and a lower end wall surface of the main body is positioned above the pressing surface. The cake discharge port penetrating in the lateral direction is provided such that the inner peripheral side of the wall surface at the lower edge thereof is substantially coincident with the height position of the corner between the upper surface of the filter medium supporting member and the pressed surface. A filtration and drying apparatus. 2. The filtering and drying apparatus according to claim 1, wherein said cake discharge port is provided with a shape in which a lower edge portion thereof is inclined downward from an inner peripheral side to an outer peripheral side of a main body wall surface. .