JPH012920A - Screw press type compressor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a screw press type compressor suitable for use in, for example, dehydration treatment of activated horse mud and urine, compression or dehydration processing of food and feed, etc. It is something.

(Prior art) Conventionally, this type of screw press type compressor is
As shown in the figure, the material to be pressed is put in and the Ruhosohar (
3I) is set upright, and the outer cylinder (32) made of a perforated plate-like screen member is inserted from below the hopper (3I) into the machine base (3I).
The outer cylinder (33) is arranged horizontally toward one end side of the outer cylinder (33).
A cake outlet (34) is provided at the end of the outer 1
A conveying screw (35) is installed in the machine (32), and the rotating shaft (36) of this conveying screw (35) is connected to the machine base (33).
) is interlocked and connected to a motor (37) provided on the other end side. Further, the rotating shaft (36) is formed into a conical shape whose diameter increases toward the cake exit 1 (34) side, and the rotation S' ((38) of the conveying screw (35) is The cylindrical outer cylinder (32
) and the rotating shaft (3B).
) is partitioned by rotary blades (38), and the radial cross-sectional area of the conveyance space (39) gradually becomes smaller as it approaches the cake outlet (34). 35) is driven and rotated to convey the compressed material to the cake outlet II (34), and the compressed material is gradually pressurized through the conveying space (39) which gradually becomes narrower. The squeezed liquid is transferred to the outer cylinder (32)
At the same time, the cake that has been pressed and shaped is taken out from the screen of 1. It was designed to extract sequentially from +(:114).

In addition, as the pressing progresses, the material to be pressed gradually solidifies and is pressed against the outer cylinder (32) with strong pressure while rotating, so that the screen member constituting the outer cylinder (32) can withstand the pressing pressure. In addition, it must be difficult to cause clogging due to foreign matter contained in the pressed material,
Conventionally, as shown in Fig. 7, a material that meets this approval has been a thin inner layer plate (40) with a thin plate thickness and a fine net [-1].
! = Outer layer plate with many large diameter punched holes (4
In the outer cylinder (32) using a screen member with such a structure, the squeezed liquid produced during squeezing is absorbed by the thin and fine inner layer plate (4).
0) is passed through the net 1 to the outside, and the compression pressure is received by the thick and strong outer layer plate (41).

(Problem to be solved by the invention) By the way, in the conventional configuration as described in "-", the inner layer plate (
40) with a slightly larger mesh, or the inner layer plate (40)
It may be possible to prevent clogging by increasing the area ratio of the mesh to the whole.
On the other hand, if you do this, you will not be able to increase the squeezing pressure,
This means that the required dewatering and pressing processes cannot be performed, so the size of the mesh and the occupied area ratio must be made thicker (there is a limit to the design, and for this reason, with the conventional configuration, it is difficult to remove contaminants from the pressed material. It is pressed strongly against the outer cylinder (32) and tends to become clogged.

In addition, when the screen member is constituted by the net 1-1, foreign matter is caught on the opening [1] of the net 1 when the material to be pressed is fed in both the circumferential direction and the axial direction by the rotation of the conveying screw. , more likely to cause blockage,
As a result of these inconveniences, there has been a problem in that high dewatering performance or compressing performance cannot be obtained.

The present invention was made to solve these conventional problems, and by adding innovation to the structure of the screen member that constitutes the outer cylinder, it is possible to obtain high dewatering performance or squeezing performance. The present invention aims to provide a screw press type compressor that hardly causes clogging.

(Means for Solving the Problems) The technical means of the present invention for achieving such [] objective is to position a dead outer cylinder between the input of the pressed material and the cake outlet. The O7I is arranged in a fixed manner, and the inner cylinder is rotatably arranged within the outer cylinder, and the O7I
A screw rotor blade that is in almost sliding contact with the outer cylinder is fixed, and the radial cross-sectional area of the conveying space for the pressed material formed between the outer cylinder and the inner cylinder is 1) 1i Cake output [-1] The diameters of the outer cylinder and the inner cylinder are changed relative to each other so that they gradually become smaller as they approach each other.The outer cylinder is made by arranging in parallel a number of strips having approximately triangular cross sections. It is characterized in that it is constituted by a screen member having a slit-like gap that is narrower on the inner circumferential side and wider on the outer circumferential side between each strip.

(Function) According to the configuration described in 1-1, the material to be pressed inputted from the input port is gradually squeezed from 11 to 11 while being conveyed in the conveying space in one direction to take out the cake by the driving rotation of the screw rotor, and in this squeezing process. The produced squeezed liquid is discharged to the outside from the gap in the outer cylinder screen, and the cakes of the pressed material that have solidified in the conveyance space are sequentially discharged from the cake outlet [1].

During this squeezing process, the inner circumferential surface of the outer cylinder has a narrow gap and a wide pressure-receiving surface, and each strip has a triangular shape and has high strength against the pressure-receiving pressure, so the object to be pressed is subjected to high pressure. Squeezing pressure can be applied, and high dehydration or squeezing performance can be obtained. In addition, since the gap is in the form of a slit, impurities in the material to be pressed that have entered the narrow gap are transported in either the circumferential direction or the axial direction due to the rotation of the screw rotor. Contaminants in the object to be pressed open [1] enter the gap without getting caught on the edges, and after entering the gap, the gap expands outward, so it does not stay there. (This means that it can be pulled out quickly to the outside, thus preventing the outer cylinder screen from clogging.

(Example) Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Figures 1 to 5 show a screw press type compressor according to this embodiment, and in Figures 1 to 3, (1) is a horizontally placed machine stand; (A hopper (2) as an input port for the material to be pressed is installed upright at one end of the machine, and the outer cylinder (3) is approximately extended from the hopper (2) toward the other end of the machine base (1). The inner cylinder (4) is arranged horizontally and in a fixed position, and the inner cylinder (4) is coaxially and rotatably arranged inside the outer cylinder (3), and the other ends of the inner cylinder (4) and the outer cylinder (3) A cake outlet II+ (5) is provided in between. This inner cylinder (4) passes through the inside of the hopper (2), and its - end is interlocked and connected to the first motor (6) with a large output. The arrow in Figure 1 (
It is rotatably driven in the a) direction, and the central part divided into approximately three equal parts is formed into a round button shape that expands toward the other end of the machine base (1), and both sides of this circle XF part (4a) small diameter shaft (4
b) and a large diameter cylindrical part (4c), of which the large diameter cylindrical part (4c) is formed by a screen member (S) through which the squeezed liquid produced by squeezing the material to be pressed passes. Further, the conical portion (4a) and the small diameter shaft portion (4b) are formed of tone plates that do not allow the squeezed liquid to pass through.

The outer cylinder (3) is entirely composed of a screen member (S), and extends from one end facing the hopper outlet [1 (2a) to the middle part located above the large diameter end of the conical part (4a). is formed into a large-diameter cylindrical shape, and the portion (3b) from this large-diameter cylindrical portion (3a) to the end 1- of the large-diameter cylindrical portion (4c) of the inner cylinder (4) is on the cake outlet (5) side. It is formed into a conical shape that tapers towards the end. Therefore, this outer cylinder (3) and inner cylinder (
4), the radial cross-sectional area or hopper output r-,1(
A conveying space (7) is formed that is maximum on the 2a) side and gradually becomes smaller toward the cake exit [1(5) side].
A screw rotor (8) fixed to the inner cylinder (4) by welding or the like is disposed in a space extending from the conveyance space (7) to the hopper (2).

This screw rotation ff (8) is rotated by the drive rotation of the inner cylinder (4) at a state r5 in which it almost slides on the inner circumferential surface of the outer cylinder (3), and due to its spiral action, the workpiece fed from the hopper (2) Remove the cake while rotating the pressed material in the rotation direction ['
1 (5) side. The conveyance space (7) is moved by this screw rotor (8).
is divided into a plurality of transport chambers (7a) that gradually become narrower toward the cake outlet 1111 (5), and in the process of transporting the pressed material to the narrower transport chamber (7a), the pressed material is The squeezed liquid is gradually dehydrated under pressure, and the squeezed liquid is discharged to the outside through the screen of the outer cylinder (3) and flows into the inner cylinder through the screen of the large-diameter cylinder 1ts (4c) of the inner cylinder. Moreover, the cake produced by this pressing is discharged to the outside from the cake outlet 1-1 (5).

The structure of the outer cylinder (3) and inner cylinder (4) described in H is such that the radial cross-sectional area of each transfer chamber (7a) approaches the cake ljl+(5) and becomes smaller. It suffices if the sweat of (304) is relatively changing, for example, outer r, i
(3) is a cylindrical shape with a constant diameter, and the inner cylinder (4) is a cake outlet 1.
．． It may also be in the shape of a circular hook that continuously expands toward the +(5) side.

By the way, inside the inward large-diameter cylinder i'fl ((4c), the squeezed fluid 1' collected inside is pumped out to the outside by empty suction.
[A 1゛L empty suction device (9) is incorporated. This 11 empty suction device (9) uses a circular forceps ff1s (4
a) and the large diameter cylindrical part (4C) to airtightly close the other end of the suction pipe (10) to the machine base. (1) installed at the other end of the ↓1 empty pump (12), which is airtightly and rotatably attached to the suction pipe (lO) and the large-diameter cylinder. A plurality of (
In addition to dividing the closed space into partition walls (four in the figure), the closed space is divided into partition walls (one
4) into multiple parts (two in the figure) in the axial direction,
Forming four reservoir chambers (15) into which the squeezed liquid enters;
A guide pipe (16) that communicates with each liquid storage chamber (+5)
It has a configuration in which the suction pipe (10) faces into the suction pipe (10).

In Figure 1, (17) is a vacuum V+1 (+8) provided in the middle of the intake path of the vacuum pump (12), which is the vacuum pump (I2).
This is a flow adjustment valve provided in the discharge path of the

1- In the 1″1 empty suction device (9) shown, when the compressor is in operation, the suction pipe (io) and the inner cylinder (4) are connected to the arrow (
It rotates in the a) direction, and as a result, squeezed liquid enters each liquid reservoir chamber (+5) from all directions. Each of these liquid storage chambers (+5)
Since the pumps also rotate in the same direction together with the suction pipe (10), the squeezed liquid that has entered this does not stay in each liquid storage chamber (+5) and efficiently flows through the suction pipe (16) through the guide pipe (16). 10), and is then discharged to the outside from the discharge path of the rL air-water pump 12).

It should be noted that a device other than a vacuum suction device may be used as a means for discharging the squeezed fluid retained in the inner cylinder (4) to the outside.

On the other hand, the cake discharge rT] (5) is provided with a discharge pressure automatic adjustment device (19) for keeping the cake discharge pressure constant or adjusting it as desired.

Conventionally, means for adjusting this discharge pressure is provided with a lid plate that closes the cake outlet 1, and this lid plate is biased toward the cake outlet side by a spring having a predetermined spring pressure. It has been proposed that the cake is discharged to the outside against the biasing force of a spring, but in this case, the cake discharge pressure is given by the spring pressure of the spring, so arbitrary adjustment is not possible. It is Noh.

Therefore, as shown in FIG. 3, the automatic discharge pressure adjustment device (19) according to the present embodiment has a rotary drum (19) that has a cylindrical portion having approximately the same diameter as the large-diameter cylindrical portion (4C) of the inner cylinder (4). 20) is butted against the end of the large-diameter cylindrical portion (4c) and rotatably supported on the suction pipe (10) via a bearing (21). )-1
−.

I) If the screw-shaped rotor blade (22) is welded in the opposite direction to the screw rotor blade 8), then this rotary drum (20) is attached to the other end of the machine base (1). This second motor (23) rotates the inner cylinder (4) in the direction opposite to the direction of rotation (direction of arrow (b) in Figure 1). By rotating, the rotary blade (22) scrapes off the cake being taken out from the cake delivery r'+ (5). Diaphragm type 1 to control the internal pressure of the cake to 1:1 side
A pressure gauge (24) is provided, and a second motor (23) is electrically linked to this pressure gauge (24).
By using an inverter pressure adjustment motor as 23), the rotational speed of the rotating drum (20) can be adjusted to any value α, thereby adjusting the cake discharge pressure.

In addition, near the cake exit n (5), the end of the large-diameter cylindrical portion (4c) of the inner cylinder is formed with a blind plate by a required dimension, for example, about 50III+1, and the end of the outer cylinder (3) around the rotating drum (20) is The portion is similarly formed of a blind plate to prevent the squeezed liquid that has reached the cake outlet 11 (5) from returning into the cake.

According to the configuration described in Section 11-, the material to be pressed that is continuously immersed from the hopper (2) is sequentially transported to the transport space (7) by the screw rotor (8), and is transported around the skewer shaft (4b). In the chamber (7a) a weak squeezing pressure is applied, after which the conical part (4
At step a), it is gradually squeezed at 1 to 6 pressures. In the squeezing process up to this conical part (4a), if-post-squeezing transfer chamber (7a
Since the cake remaining in ) has not yet reached the stage of solidification, the squeezed liquid is discharged to the outside through the screen of the outer cylinder (3).

However, at the time when the pressed material reaches the narrow transfer chamber (7a) around the large-diameter cylindrical part (4C), the pressing pressure applied to the pressed material becomes quite high, so that the For example, if the inner chamber (4) is entirely made of plywood, a solid layer is generated on the surface layer of the material to be pressed in the transfer chamber (7a), and i)' + Notation The squeezed liquid produced in the conveying chamber 7a) is not discharged through the screen due to the presence of the solid layer, and remains in the conveying chamber (7a) as water bubbles until the cake comes out [+(5), and this cake Since the water bubbles return to the cake that has been released from the pressing pressure in ``1 old'' (5), the dehydration or pressing performance is significantly reduced.

On the other hand, in this embodiment, the squeezed liquid generated in the inner layer of the cake is transferred from the screen of the inner cylinder (4) to the suction pipe (10).
Since the water is discharged to the outside through the process, the formation of blisters is suppressed and the dehydration effect is significantly improved.

In the compressor of this embodiment configured as described in 1- below,
The entire outer cylinder (3) and the large diameter cylindrical part (4) of the inner cylinder (4)
The screen member (S) constituting C) has the following structure.

That is, as shown in FIGS. 4 and 5, each screen member (S) is made of a stainless steel strip (25) whose cross section is approximately an isosceles diagonal with a certain gap (t). A large number of strips (25) are arranged in parallel, and in this parallel state, each strip (25) is displaced in a slightly inclined shape, and while this displacement posture is maintained, this strip is placed on the tip side of each strip (25). Each strip (25) is welded with connecting strips (2Ga) or (2Gb) of 114 plate rods arranged almost orthogonally to each other.

In this way, each strip (25) has a slit-like gap (1) with a cross section of 18 that is narrow on the bottom side and wide on the tip side.
5) What about the letter of approval that was inserted in between? When constructing the outer cylinder (3) using the screen member (S) that
) and the gap (1) are substantially along the axial direction, and moreover, the direction of rotation when conveying the pressed material, that is, the screw rotor blade (8
) of the gap (1) in front of the rotation direction 1-. The device is arranged in a step-like configuration in which one side edge projects toward the conveyance space (7) with a difference in level from the opposing side edge adjacent to this side edge. In addition, the screen member (S) is attached to the outer cylinder (3).
When used for this purpose, the connecting strip (2Ga) disposed around the outer periphery of the outer cylinder (3) has a water droplet shape in cross section.

On the other hand, when forming the inner cylinder (4) with the screen member (S), the bottom surface of each strip (25) is the outer periphery, and the strip (25) and the gap (1) are approximately circular. Cake coming out along the circumferential direction and during conveyance of the pressed material 1-1
(5) Opening of gap (1) at the front in the conveyance direction [1
The side edge has a step-like arrangement so as to protrude toward the conveyance space (7) with a step difference from the opposing side edge adjacent to the side edge. Further, when the screen i'l<14 (S) is used in the inner cylinder (4), the connecting strip (2Gb) arranged on the inner peripheral surface of the inner cylinder (4) has a cross section as shown in Fig. 2. A deck-shaped one is used.

In addition, the dimensions of each part of the screen member (S) are as follows:
The width of the bottom w=2.5~3.0cm, the narrowest part facing the conveyance space (7) of the gap (1) x=0. I ~ 0.5 open, step h: 0.2 ~ 0.5 mm, vertical connection row shrine (2Ga
) Width y: about 8.0 mm, ・V plate-shaped connecting strip (21
The width Z of b) is set to approximately 3.0++v.

In a compressor having an outer cylinder (3) and an inner cylinder (4) configured using a screen member (S) as described in 1-, the outer cylinder (3) and the inward large diameter cylinder part (
The inner circumferential surface facing the conveyance space (7) of 4c) has a narrow gap (1) and a wide pressure-receiving surface. Since the material has high strength against water, it is possible to apply high pressure to the material to be pressed and perform powerful dehydration or compression.

In addition, the contaminants in the pressed material that have entered the narrow gap (1) are caught on the open 1-1 edge of the slit-shaped gap (1) by the spiral action of the screw rotor (8). Get into it easily. That is, in this case, the foreign matter in the material to be pressed that has been pushed into the outer ring (3) and the inner ring (4) is removed by the opening of the gap (t) due to the existence of the step 11 in 1111. 11 It smoothly enters the gap (1) without getting caught on the edge, and after entering the gap (t), it quickly comes out from the gap (1), which expands into a J, i'A shape, without any retention. I'm going.

In forming the screen member (S), the bottom surface of each strip (25) is arranged so as to be flat, and the opposing distance 1-1 of the gap (1) between each strip (25) is Even if there is no step between the edges, depending on the type of material to be pressed or the purpose of the press, it may become clogged (it is possible to use it for toilet purposes).

(Effects of the Invention) As described in 1-1 above, according to the present invention, a large number of strips having an approximately diagonal cross section are arranged in parallel, and the inner peripheral surface side is arranged between each strip. Since the removal 1 is constituted by a screen member having a narrow and wide slit-shaped gap on the outer circumferential side, during the squeezing process, the gap is narrow on the inner circumferential surface of the outer cylinder (the pressure-receiving surface is wide -1- In addition, since each strip has a diagonal shape and has high strength against pressure, the material to be pressed can be compressed under high pressure, achieving high dewatering or pressing performance. In addition, since the gap is in the form of a slit, the contaminants in the material to be pressed that have entered the narrow gap are transported in the circumferential and axial directions due to the rotation of the screw rotor blades. In either direction, impurities in the object to be pressed open 11 and enter the gap without getting caught on the edges, and after entering the gap, the gap expands outward. Therefore, there is no stagnation (drainage is quickly discharged to the outside), and therefore, the occurrence of 1-1 clogging of the outer cylinder screen is reliably prevented.
It has now become possible to achieve high dewatering performance or squeezing performance.

[Brief explanation of drawings]

Figures 1 to 5 show an embodiment of the screw press type compressor according to the present invention. Fig. 3 is an enlarged sectional view taken along the line ■-■, Fig. 3 is an enlarged sectional view of Ill< in Fig. 1, Fig. 4 is an enlarged longitudinal sectional view of the - section of the outer cylinder, and Fig. 5 is an enlarged longitudinal sectional view of the inner cylinder and outer cylinder. −・It is an enlarged longitudinal cross-sectional side view of the person. 6 and 7 show a conventional example, with FIG. 6 being a partially cutaway side view and FIG. 7 being a partially enlarged sectional view of the outer cylinder. (2)...Input 1-1 (hopper), (3)...Outer cylinder, (4)...Inner cylinder, (5)...Cake output 1-1,
(7)... Conveyance space, (8)... Screw rotor, (25)... Strip material, (S)... Screen) heavy phase, D)... Gap, (h)... ··Step. Fig. 2 3b '・25 C Fig. 3 Fig. 4 t t3 / ll Fig. 5 r 26b

Claims (4)

[Claims] (1) An outer cylinder (3) is arranged in a fixed position between the input port (2) of the pressed material and the cake outlet (5), and the inner cylinder (3) is placed in the outer cylinder (3). 4) is rotatably disposed, and a screw rotor (8) which is in almost sliding contact with the outer cylinder (3) is fixed over the axial direction of the inner cylinder (4), and The outer cylinder (3) and the inner cylinder (4) are arranged in such a way that the radial cross-sectional area of the compressed material conveyance space (7) formed between the inner cylinder (4) and the outer cylinder (3) gradually becomes smaller as it approaches the cake outlet (5). Inner cylinder (4)
While relatively changing the diameter of the outer cylinder (3),
A large number of strips (25) having a substantially triangular cross section are arranged in parallel, and a slit-shaped gap (t) is provided between each strip (25), which is narrow on the inner peripheral surface side and wide on the outer peripheral surface side. A screw press type compressor characterized by comprising a screen member (S). (2) In the inner cylinder (4), a large number of strips (25) having a substantially triangular cross section are arranged in parallel, and a gap is formed between the strips (25), which is wide on the inner peripheral surface side and narrow on the outer peripheral surface side. (t) A screw press type compressor according to claim 1, comprising a screen member (S) provided with a screen member (S). (3) The front opening side edge of the gap (t) in the conveying direction of the pressed object is configured to have a step (h) and protrude toward the conveying space (7) than the opposite side edge adjacent to this side edge. For each strip (2
5) The screw press type compressor according to claim 1 or 2, wherein the peripheral surface facing the conveyance space (7) is sloped in steps. (4) The screw press type squeezing machine according to claim 2, which is configured to discharge the squeezed liquid accumulated in the inner cylinder (4) to the outside.