JPH08208A - Solid-liquid separating apparatus - Google Patents

Abstract

PURPOSE:To provide a solid-liquid separator applicable also to filtration of a solid-liquid mixture having high viscosity and having extremely high squeezing filtering effect. CONSTITUTION:The rotation pitch of a screw-like blade 12 is formed in a direction transferring a liquid to be treated from the inlet 7 to the discharge port 8 and pitch interval is formed so as to gradually become narrow and the volume of the pitch becomes smaller as the liquid to be treated approaches the discharge port 8 side of the filtered refuse. Since a scraper piece 19 is attached to the end of the screw-like blades 12, the filtered refuse is pushed out without causing pressure leakage between the screw-like blades 12 and since volume between screw-like blades becomes smaller as the filtered refuse is pushed out, pressure generated between the screw-like blades becomes gradually strong as the refuse approaches the discharge port 8 and effective squeeze effect is obtained from the first to the last.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-liquid separation device.

[0002]

2. Description of the Related Art Conventionally, many solid-liquid separation devices in which screw-shaped blades are applied to a cylindrical filter element have been proposed.

In these solid-liquid separators, a solid-liquid mixture is supplied to the inside of the filter element from an inlet provided at one end of the filter element, and the liquid-solid mixture is pushed forward by a screw blade. The solid-liquid separation (filtration) was performed by discharging the components from the filtration holes formed in the filter element.

[0004]

However, the above-mentioned conventional solid-liquid separator has the following problems.

Since there is a slight gap between the screw blade and the filter element, when applied to a highly viscous solid-liquid mixture, the solid content adheres to it and causes clogging. For this reason, the screw-shaped blade cannot be smoothly rotated, the solid content cannot be pushed forward, and filtration cannot be performed. Therefore, it was completely unsuitable for filtration of a solid-liquid mixture having a high viscosity such as a soymilk stock solution.

Even if the viscosity of the solid-liquid mixture does not cause the above problems, pressure leakage occurs from the gap between the screw-shaped blade and the filter element, so that the rotation of the screw-shaped blade causes solid-liquid mixing. He could not apply strong pressure to his body, and as a result, the squeezing filtration effect was weak.

Generally, the intervals between the screw-shaped blades are formed to be constant, and the volume between the screw-shaped blades is constant from the inlet side to the outlet side of the filter residue, so that the squeezing filtration effect is exerted only on the inlet side portion. It almost comes out with.

For this reason, generally, a soy milk stock solution having a high viscosity has been filtered by a multi-stage filtration in which the filtration pores are changed from a large one to a small one, or a primitive filtration using a mesh.

The present invention has been made in order to solve these drawbacks of the prior art, and provides a solid-liquid separation device which can be applied to the filtration of a solid-liquid mixture having a high viscosity and has a very high squeezing filtration effect. The purpose is to

[0010]

The solid-liquid separation device of the present invention is provided with a scraper mechanism that rotates along the peripheral surface of a cylindrical or conical filter element and that is in sliding contact with the filter element over the entire outer peripheral end surface thereof. A solid-liquid separator having screw-shaped blades, wherein the volume between the screw-shaped blades is gradually reduced from the inlet of the solid-liquid mixture toward the outlet thereof.

Here, in the screw-shaped blades, the volume between them can be gradually reduced by gradually reducing the pitch interval between them.

[0012]

According to the present invention, since the scraper mechanism provided on the entire outer peripheral end surface of the screw-shaped blade is in sliding contact with the filter element, even if the solid-liquid mixture introduced from the inlet is highly viscous. The solid content is not clogged and pressure leakage does not occur, and the solid blades are sequentially pushed out toward the discharge port side by the screw blades. Then, as the distance between the screw-shaped blades gradually decreases as it is pushed out, the pressure generated between the screw-shaped blades gradually increases, and a very good throttle pressure can be obtained until the end.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

This example illustrates a machine suitable for obtaining soy milk from a soy milk stock solution.

Reference numeral 1 denotes a cylindrical filter element,
While holding the flat bottom surface 2a of the wire 2 having an isosceles triangular cross section inside, the wire is engaged with the spiral groove 4 bored in the inner periphery of the perforated frame cylinder 3 with the apex of the apex 2b facing outward. A slit hole 5 having a desired size can be formed between the adjacent wires 2 and the inner peripheral surface of the wound wire 2 can be formed into a flat α by the flat bottom surface 2a.

Reference numeral 6 denotes a cylindrical tube body to which a cylindrical filter element 1 having a slit hole 5 of a desired size is selectively fixed, one side of which is an inlet 7 for the liquid to be treated and the other side thereof is A solid content extraction mechanism 9 having a filter dust discharge port 8 is provided.

Reference numeral 10 denotes a rotary shaft 11 having a large number of divided pieces 12a.
2 shows a screw provided with screw-shaped blades 12 fixedly attached to each other, the screw-shaped blades 12 being rotatably vertically mounted inside the cylindrical filter element 1, and the screw-shaped blades 12 are flat α inside the cylindrical filter element 1. It is held in a non-contact manner with a slight distance from the peripheral surface.

The screw-shaped blades 12 may be formed by using not a divided piece but an ordinary long member twisted continuously (not shown).

As shown in FIG. 1, the screw-shaped blades 12 are formed such that the rotation pitch of the screw-shaped blades 12 transfers the liquid to be treated from the inlet 7 to the outlet 8, and the pitch intervals and filter residue are also discharged. The volume is gradually narrowed toward the outlet 8 side, and the volume between them is reduced.

Reference numeral 13 is a drive mechanism, and the electric motor 14 is passed through a speed reducing mechanism 15 such as a belt or a gear, and the screw 1
It is connected to the rotary shaft 11 of 0.

In addition, in the solid content extracting mechanism 9, the pressing valve 17 pressed by the coil spring 16 is brought into contact with the discharge port 8 whose diameter is narrowed, and the coil spring 16 is A screw rod 18 whose spring pressure can be variably adjusted
The squeezing effect of the solid content taken out can be variably adjusted.

Reference numeral 19 denotes a scraper piece made of synthetic resin or the like of the scraper mechanism 20, and the screw blade 12
The scraper piece 19 is in sliding contact with the flat surface of the filter element 1.

The scraper mechanism 20 is, for example, a fourth
The configurations shown in FIGS. (A), (b) and (c) can be adopted.

First, in (a), a dovetail groove 21 is bored in the end face of the screw-shaped blade 12, and a string-shaped scraper piece 19 having a convex portion 22 that engages with the dovetail groove 21 is provided. The pressing spring 24 is accommodated in the small hole 23 bored by the above, and the tension of the pressing spring 24 constantly urges the scraper piece 19 to project outward.

Also, (b) is the scraper piece 19 of (a).
It is a slightly deformed version of the dovetail that eliminates the dovetail and is a flat slot 2
5 and a scraper piece 19a provided with a protrusion 26 that engages with the groove 25. The scraper piece 19a is pressed by the pressing spring 24 as in the case of (a).

Further, (c) will be described.

A step portion 27 is formed by cutting out a part of the end face of the screw blade 12, a step portion 28 corresponding to the step portion 27 is provided on the scraper piece 19b, and a step 29 is formed at a desired interval. The scraper piece 19b is fixed and attached.

Each of them is preferably made of a synthetic resin material having high abrasion resistance, and it is also possible to make it short and to attach it continuously.

In the figure, 30 is a pipe for taking out the filtrate, which is fitted and fixed in a portion of the cylindrical pipe 6 corresponding to the outer periphery of the cylindrical filter element 1, and 31 is a part of the pipe 30. A pipe for discharging the filtrate, a reference numeral 32 denotes a hopper provided below the filter residue discharge port 8, a reference numeral 33 denotes a device frame for arranging the entire configuration, and a reference numeral 34 denotes a filter residue discharge port 8 side of the cylindrical tubular body 6. With a cylindrical tubular body holding frame that is screwed into the device frame 33.
With this, the filter residue discharge port side of the cylindrical tube body 6 can be supported. Reference numeral 36 is a support frame that supports the other side of the screw 10.

With the above construction, a desired liquid to be filtered, for example, a solid-liquid mixed liquid such as soy milk stock solution is supplied into the cylindrical tube body 6 from the inlet 7 and the screw 10 is rotated by the drive mechanism 13. For example, the soymilk stock solution is transferred in the cylindrical tube body 6 by the twist pitch of the screw-shaped blades 12, and only the liquid component that can pass through the slit holes 5 of the cylindrical filter element 1 is taken out as soymilk of the filtered solution. It is obtained from the outlet pipe 31 via 30. Since this type of soymilk stock solution contains a solid content having high adhesiveness and adhesiveness, the slit hole 5 is immediately closed and so-called clogging is likely to occur. Since the scraper mechanism 20 is provided instead of the above, the clogging filter residue is immediately removed by the scraper piece 19. Further, since the entire area of the scraper mechanism 20 is in sliding contact with the filter element 1, filter scraps are clogged in the gap between the screw blade 12 and the filter element 1 and the screw 10 cannot be rotated. There is no inconvenience, and solids of filter residue are pushed forward one by one.

At this time, since the scraper piece 19 is attached to the end of the screw blade 12, the filter residue solid is extruded without causing pressure leakage between the screw blades 12, and the screw blade is pushed as it is extruded. Since the volume between them becomes small, the pressure (throttle pressure) generated between the screw-shaped blades gradually increases as it approaches the discharge port 8, and an effective juice extraction effect is obtained from the beginning to the end.

In the process of this transfer, the concentration of the filter residue gradually increases, in other words, the liquid content gradually decreases, and the solid content discharging mechanism according to the tension of the spring 16 works to obtain a desired content. It is possible to intermittently discharge the filter residue (okara) from the discharge port 8 in a dry state containing the liquid.

That is, if the tension of the spring 16 is large,
Since the liquid content in the filter residue is small, and conversely, if it is small, the liquid content in the filter residue is large, the tension of the spring 16 can be varied in magnitude to allow the filter residue in a desired state to be discharged from the discharge port 8. it can.

One embodiment of the present invention has been described above. In particular, in addition to the configuration of the cylindrical filter element shown, for example, a cylindrical filter having a desired filtering hole such as a punching metal or a porous structure is used. Of course, the same can be done.

The cylindrical tube body 6 may stand upright not vertically but vertically.

Incidentally, the filter element in the above-mentioned embodiment has a cylindrical shape but a conical shape in the same manner, and the screw-shaped blades are arranged not on the inside of the filter element but on the outside thereof, that is, a so-called ribbon. The same can be applied to the screw blade.

[0037]

As described above, since the solid-liquid separation device of the present invention does not cause clogging due to the scraper mechanism, it can be applied to the filtration of a highly viscous solid-liquid mixture, and the scraper mechanism is provided. In addition, the squeezing filtration effect becomes very high by gradually reducing the volume between the screw blades.

[Brief description of drawings]

FIG. 1 is a partially longitudinal side view showing an embodiment in which a scraper filtration system according to the present invention is applied to a tubular solid-liquid separator.

FIG. 2 is a sectional view taken along line II-II of the above.

FIG. 3 is a partially cutaway perspective view of the above cylindrical filter element.

4 (a), (b) and (c) are partially enlarged perspective views showing respective three examples of scraper mechanisms.

[Explanation of symbols]

 1 Cylindrical Filter Element 5 Slit Hole 10 Screw 12 Screw Blade 17 Pressing Valve 19a, 19b, 19c Scraper Piece 20 Scraper Mechanism 24 Pushing Spring

Claims (2)

[Claims] 1. A solid-liquid separation device comprising screw-shaped blades provided with a scraper mechanism that rotates along the peripheral surface of a cylindrical or conical filter element and that is in sliding contact with the filter element over the entire outer peripheral end surface thereof. , A solid-liquid separation device formed such that the volume between the screw-shaped blades gradually decreases from the inlet of the solid-liquid mixture toward the outlet. 2. The solid-liquid separation device according to claim 1, wherein the screw-shaped blades gradually reduce the volume between them by gradually reducing the pitch interval between them.