JPS59183810A - Concentrator for liquid containing solid substance - Google Patents

Abstract

PURPOSE:To keep the high filtering function of a filter cloth without causing any blinding as well as make the cleaning of the cloth easier by a method in which a filter cloth formed by lapping two filter clothes having different meshes is used, and liquid in the filtering chamber is jetted onto the surface of the filter cloth. CONSTITUTION:When a liquid A containing solid substances is sent under pressure into a supply tube, the liquid A is filtered through the filter cloth layer 3 formed by lapping two filter clothes 1 and 2 having different meshes although the liquid A goes in the zif-zagged path along a guide plate 9. The solid particles not passing through the filter cloth layer 3 are redispersed in the liquid A by jetting the liquid in the concentration chamber 5 in the opposite direction to the advancing direction of the liquid A and also in downward direction on the surface of the filter cloth layer 3 from many jet nozzles provided to a jet tibe 8, and thereby the liquid A in the concentration chamber 5 is changed to a concentrate B of a comparatively uniform density and sent out through a concentrate discharging tube 11 to the outside of the device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for concentrating liquids containing solid substances formed during food processing, water treatment, pharmaceutical processing, etc. processing steps.

As is well known, a pressurized concentrator as shown in FIG. 1 has been widely used as this type of concentrator. This pressurized concentrator consists of a box-shaped container 4 with an opening at the top, and a pressurizing plate F connected to the tip of a piston E that reciprocates within a cylinder formed at the top of a box-shaped container 4. The chamber G is partitioned into two chambers by a filter cloth 3 made of a fiber layer having uniform openings in the direction. Then, the liquid A containing a solid substance is pressurized into the concentration chamber 5, which is the upper of the two chambers, from the supply pipe 10 by a pump not shown, and is pressurized by pressing down the pressure plate F, thereby performing pressure filtration. The filtrate C that has passed through the filter cloth 3 is discharged from the filtrate suction chamber 6 below the concentration chamber 5 to the outside of the apparatus via the filtrate discharge pipe 12, while the concentrated liquid A containing solid substances formed in the concentration chamber 5 is B is sent out of the apparatus through the concentrate discharge pipe 11, and the filtration capacity is controlled by adjusting the pressure by the pressurizing plate F, so that the concentrate B of a constant concentration can be provided.

In such pressurized concentrators, the filter cloth 3 often gets clogged.Secondly, it is difficult to maintain a constant filtration capacity, and the structure is sealed in case of clogging. It is difficult to clean and replace the upper filter cloth 3, and furthermore, it is accompanied by various drawbacks such as difficulty in obtaining a concentrated liquid B having a uniform density due to sedimentation or accumulation of solids on the filter cloth. .

The present invention has been made in view of the above circumstances, and has a method that maintains the filtration function of hardness and prevents clogging, regardless of the SSa degree of the liquid containing the solid substance introduced. It is an object of the present invention to provide a device for concentrating a liquid containing a solid substance whose cloth can be easily washed.

Embodiments of the present invention will be described in detail below based on the drawings.

As shown in FIGS. 2 to 9, the device for concentrating a liquid containing a solid substance according to the present invention includes a porous first filtration part 1 having a fine opening 1a and an S1 filter on its upper surface. A filter cloth 3 in which a second filter member 2 having a mesh opening 2a larger than the mesh opening 1a of the cloth member 1 is overlapped, and two chambers are formed in the vertical direction by fixing the filter cloth 3 in the horizontal direction in the center. a box-shaped container 4, and a concentration chamber 5 located at the upper side of the two chambers.
, a filtrate suction chamber 6 located below the concentration chamber 5, and a jet pipe that has a number of jet nozzles 7 provided in parallel at the lower part of the concentration chamber 5, and jets out the liquid in the concentration chamber 5 by a pump 8a attached thereto. 81, several guide plates 9 installed in the concentration chamber 5 perpendicular to the surface of the filter cloth 3, a supply pipe 10 for supplying the liquid A containing solid substances, a concentrated liquid B of the liquid A formed in the concentration chamber 5; It consists of a concentrated liquid discharge pipe 11 for discharging the liquid to the outside of the apparatus, and a filtrate discharge pipe 12 for sucking out the filtrate B fed into the filtrate suction chamber 6 to the outside of the apparatus by a pump (not shown).

When the liquid A containing a solid substance is pressurized into the supply pipe 10 by a pump (not shown), the liquid A takes a meandering flow path along the guide plate 9, but is brought under reduced pressure by a vacuum pump (not shown). Due to the filtration differential pressure generated between a certain filtrate suction chamber 6 and the concentration chamber 5 into which liquid A is pressurized, filtration is performed on the filter cloth 3 surface which is the interface between the two chambers 5.6, and as shown in FIGS. As shown in FIG. 5, the size is smaller than the opening 2a of the second filter member 2, and the holes of various sizes formed by the overlapping of the second filter member 2 and the first filter member 1 are When the solid particles α in the liquid A, which are larger than the gap χ, become clogged and fixed inside the holes of the openings 2a of the second filter member 2, the openings 2a of the second filter member 2 are finally closed. A kind of filter D is formed by the aggregate of the solid particles α, and from then on, only the filtrate C containing solid particles even smaller than the micro gaps between the fixed solid particles α passes through the first filter portion 4A1. fi,
'/& After being fed into the suction chamber 6, it is sucked out of the apparatus from the filtrate discharge pipe 12 by a pump (not shown). On the other hand, solid particles that cannot pass through the filter cloth 3 tend to deposit or accumulate on the surface of the filter cloth 3, but the liquid A is deposited on the surface of the filter cloth 3 from a large number of jet nozzles 7 provided in the jet pipe 8 in the traveling direction of the filter cloth 3. The liquid in the concentration chamber 5 is redispersed in the liquid A due to the blowing effect of the liquid in the concentration chamber 5 that is jetted out in the opposite direction and downward, and the stirring effect of the liquid A induced thereby. After converting the liquid into a concentrated liquid B having a relatively uniform density, the a-condensed liquid is sent out of the apparatus through a concentrated liquid discharge pipe 11.

In the embodiment described above, several jet pipes 8 were arranged in parallel so as to be parallel to the guide plate 9, and each jet pipe 8 was provided with a pump 8a to jet the liquid. As shown in the figure, it is of course possible to integrate the respective ejection pipes 8 to form one meandering pipe and use one pump.

Further, the guide plate 9 is used as a flow path adjustment plate 13, and the flow path of the liquid A to be press-injected is made to meander by the collision between the guide plate 9 and the liquid container, and promotes stirring so that the liquid A passes through the flow path. The idea is to increase the amount of contact between the liquid and the filter cloth and improve the filtration ability by uniformly contacting the entire liquid with the filter cloth, rather than just a portion of the liquid. As shown in FIG. 2, several weir plates 14 are provided in place of the guide plate 9 as flow path regulating plates 13 in the concentration chamber 5 perpendicular to the filter cloth.
It is possible to obtain the same filtration ability by using the upper space 15 of the weir 14 as a flow path for the liquid A.

In the filter cloth 3, the aggregate of solid particles α stuck and fixed inside the openings 2a of the second filter member 2 performs a kind of filter function, so that the components of the solid particles α and Although the filtration capacity of the filter cloth 3 is determined depending on the situation,
Capturing of solid particles even smaller than the fine opening 1a of the 111th cloth member 1 is ensured.

The first and second filter cloth members 1 and 2 may be integrated by adjusting the openings la and 2a by changing the weaving method of the synthetic fibers, etc., or they may be made of different sizes. It is also possible to overlap two filter cloths with mesh openings la and 2a, but in the latter case, due to electrical repulsion due to the difference in the charged state between the surface of the filter cloth and the surface of solid particles α, fine mesh openings may be created. Since the surface of the first filter cloth member 1 having the diameter 1a is hardly contaminated, only the second filter cloth member 2 having the larger opening 2a needs to be cleaned by backwashing.

The opening 2a of the second filter member 2 is preferably within a few millimeters, but if it is thick, the second filter member 2 of the solid particles α
The size may be several millimeters or more, since this makes it difficult for the tube to pass through the tube and is likely to become clogged.

Furthermore, if a porous filter cloth member having a mesh size smaller than the mesh size 1a of the first filter cloth member 1 is superimposed below the first filter cloth member 1, even finer solid particles α can be captured. In addition to this, it also helps improve the strength of the filter cloth. Therefore, by overlapping three or more filter cloth members in order from the top, starting with the one with the largest opening, it is possible to arbitrarily construct a filter cloth having a high degree of filtration function.

Furthermore, a filter cloth having an appropriate sound is used as the first filter cloth member 1, and small holes with an opening 2a larger than the opening 1a of the first filter cloth member 1 are formed in the synthetic resin film or sheet on the upper surface of the first filter cloth member 1. Similarly to the above-mentioned filter cloth made of only a single fiber, the filter cloth formed by stacking the board-shaped second filter portions 2 can also be clogged in the inner material of the openings 2a of the second filter cloth member 2. A type of filter D formed by the fixed solid particles α performs a high-level filtration function, but as shown in FIGS. 9 and 10, the small holes provided in the second filter portion If the small holes in the lower aperture have an inclination angle θ of about 15°, the filter cloth can be easily cleaned by backwashing on one side, but if the angle θ is larger than that, the filtration of the filter cloth This is not practical as it reduces the area.

As is clear from the above explanation, according to this device for concentrating a liquid containing a solid substance, the pump 8 installed in the concentration chamber 5
Due to the blowing effect and stirring effect of the liquid in the concentration chamber 5 which is ejected from the ejection nozzle 7 of the ejection pipe 8 connected to a,
Sedimentation and deposition of solid particles on the surface of the filter cloth 3 is prevented, and the clogging of the filter cloth 3 is reduced, and not only is the ascites B having a uniform density provided, but also the phases of the openings Ia and 2a are Different first and second filter section controls, filter cloth 3 overlapping 2
By using the filter cloth, it is possible to capture even finer solid particles than the fine opening 1a of the first filter cloth section 1, so there is no need to use an expensive filter cloth with fine openings. It is economical, and unlike conventional filter cloths, only the filter cloth member at the top with the largest openings gets dirty, and the filter cloth member below it has smaller openings. Since it causes almost no dirt, it can be easily cleaned by backwashing on one side. In particular, in the case of a filter cloth having a punching board-like member with small holes for the lower diaphragm at the top of the filter cloth member, the inside of the hole in the filter cloth member is suitable for backwashing, as shown in Figure 10. ('E Since the cleaning path having the oblique angle θ is formed, it can be cleaned very easily by backwashing.

[Brief explanation of drawings]

Fig. 1 is an explanatory side view of a conventional pressurized concentrator, Fig. 2 is an explanatory side view of the inventive device, Fig. 3 is a front explanatory view of the same, and Figs. 4 and 5 are components of the inventive device. FIG. 6 is a front view of the inventive device having a single ejection pipe, FIG. 7 is a side view of the inventive device with a weir plate provided in the concentration chamber, and FIG. 9 is an explanatory front view of the same, FIG. 9 is an explanatory cross-sectional view of the filter cloth having a punching board-like second filter cloth portion provided with small holes for the lower aperture, and FIG. 10 is an enlarged view of the filter cloth. 1-.-first filter member, la-opening of first filter member,
2-second filter member, 2a-opening of second filter member, 3-
Filter cloth, 4-box-shaped container, 5-concentration chamber, 6...-filtrate suction chamber, 7--spray nozzle, 8-spray pipe, 8a-pump, 1
0--supply pipe, 11-concentrate discharge pipe, 12-filtrate discharge pipe, 13-flow path adjustment plate. Patent Applicant Patent Attorney Mihiko Watanabe Figure 3 Figure 4a Figure 7 Figure 8

Claims (1)

[Claims] 1. A second porous filter member having a larger opening than the first filter cloth member is superimposed on the upper surface of a first filter member having a fine opening. The box-shaped container is vertically divided into two parts by a filter cloth configured with a filter cloth, and the liquid containing a solid substance is press-injected from a supply pipe provided at one end of the upper concentration chamber into the other end of the concentration chamber. A flow path adjustment plate is arranged inside the concentration chamber so as to increase the amount of contact with the filter cloth surface before being discharged from the discharge pipe provided in the concentration chamber, and the filtrate suction chamber under reduced pressure below the two halves. 'I! passed through the filter cloth. A filtrate discharge pipe connected to a pump for discharging liquid I is provided, and the concentration chamber further includes a jetting nozzle for spouting the liquid in the concentration chamber in a direction opposite to the traveling direction of the liquid and toward the surface of the filter cloth. A device for concentrating liquids containing solid substances, which is equipped with an ejection pipe. 2. The first and second filter cloth members, which are the constituent elements of the filter cloth, are each made of a single fiber such as synthetic fiber or ceramic fiber, and the two members are made by changing the weaving method and adjusting the opening. 2. The device for concentrating a liquid containing a solid substance according to claim 1, which is an integrated device or a device in which two filter cloths with different mesh sizes are stacked one on top of the other. 3. The second filter cloth member, which is a component of the filter cloth, is in the form of a punching board with small holes formed in a synthetic resin film or sheet, and the first filter cloth member, which is another component, is made of a single fiber. An apparatus for concentrating a liquid containing a solid substance according to claim 1, which comprises: 4. The device for concentrating a liquid containing a solid substance according to claim 3, wherein the small hole provided in the second filter member is a small hole of a lower diaphragm.