KR101946258B1 - Double-screw equipped horizontal decanter type centrifuge separator - Google Patents

Abstract

The present invention relates to a horizontal centrifugal concentration dehydrator having double screws, which comprises: a long bowl rotating along with a frame to which an anti-vibration device is attached; a double screw conveyor; a main motor rotating the long bowl; and a vehicle speed motor controlling a rotational number of the double screw conveyor. According to the present invention, compared to a conventional dehydrator, the dehydrator is constituted to be direct flow type so that an introduction direction of a material is the same as a discharge direction thereof and the diameter of the long bowl is reduced and the length of a horizontal part of the long bowl is increased within a range of a predetermined ratio to make small the diameter of the rotating long bowl, thereby reducing manufacturing costs and electric energy to be consumed for rotational inertia. In addition, retention time for precipitation of a solid material, which precipitates from the horizontal part to the inner wall of the long bowl, is lengthened to increase compaction force (M) caused by centrifugal force. Furthermore, speed, at which a precipitating solid material is being transferred toward a conical portion through a first spiral wing and a second spiral wing, is increased, screw pitch (interval) gets narrower to increase transfer pressure (P) of the solid material, dehydration efficiency of the solid material can be enhanced by shear force (T) applied when the transferred solid material is returned from an inclined inner side surface of the conical portion of the long bowl, and automated operation can be performed by proportional control.

Description

TECHNICAL FIELD [0001] The present invention relates to a double-screw centrifugal separator and a double-screw centrifugal separator,

The present invention relates to a horizontal centrifugal separating and dehydrator equipped with a double screw and more particularly to a centrifugal separating type dehydrator comprising a rectifying type (positive flow type) so that the direction of the input and the direction of discharging the solid are the same, And increasing the horizontal length of the long bowl to increase the sedimentation solids retention time to increase the consolidation force M and to accelerate the settled solids feed rate to the first spiral wing and the second spiral wing of the double screw conveyor for the settled solids The conveying load is reduced and the screw pitch interval is narrowed through the first helical wing and the second helical wing to increase the conveying pressing force P of the sedimented solids and when conveying the conveyed solids on the inclined inner surface of the cone portion of the long bowl The dehydration efficiency of the solid material is improved by the acting shear force T, the diameter of the rotating ball is reduced, and the length is increased to secure the volume, The present invention relates to a horizontal centrifugal separator and dehydrator equipped with a double screw that reduces energy consumption by reducing rotational power by minimizing inertia.

Conventional separation of liquid and solids such as wastewater sludge is generally performed in a horizontal centrifugal separator in which a cylindrical horizontal portion and a conical portion having a slope are integrally joined to inject sludge at the solids discharge side.

In the horizontal centrifugal separator, when the separation liquid is supplied to the charging portion of the rotary bowl, the liquid and the solid are separated by a high centrifugal force field (about 2000 to 3000 G) in the horizontal portion bowl immediately after the supply, The centrifugal force is weakened because the distance from the center of rotation is small in the conical portion of the bowl, and the light solid is floated into the circumference of the screw shaft and is discharged as it is, resulting in an increase in the water content of the solid on the average.

In addition, the solids separated from the horizontal bowl pass through the inclined surface of the cone bowl for discharging beyond the level in the horizontal bowl, so that slippage occurs and the discharge is not smooth.

In order to lower the water content of the solid cake to be discharged, the shear force must be increased at the inclined surface of the bowl. Therefore, the number of revolutions of the rotary bowl must be rotated at a higher speed than necessary, so that the power consumption is increased and the equipment is relatively increased.

A horizontal centrifugal separator is proposed in Korean Patent Registration No. 10-0407896 entitled Sludge Concentration Dewatering Horizontal Centrifuge.

The horizontal centrifugal separator has been proposed in Korean Patent Registration No. 10-0407896 entitled Sludge Concentration Dewatering Horizontal Centrifuge.

The technical structure described above is a background technique for assisting the understanding of the present invention, and does not mean the prior art widely known in the technical field to which the present invention belongs.

In the conventional horizontal centrifugal separator, if the rotating bowl is lengthened as compared with the conventional rotating bowl, the gear box and the vehicle speed motor are overloaded, and the vehicle speed is reduced too much, causing a carry over phenomenon.

First, if the centrifugal force is increased, the performance of the sludge can be improved in water content, SS recovery rate, throughput, etc. However, if the centrifugal force of the rotating bowl is increased too much, slip of the sludge in the slope portion increases to lower the conveying ability of the screw conveyor. There is a problem that sludge is injected in the discharge direction of the settled solid matter, and the vortex phenomenon occurs between the transferred solid and the input.

Second, increasing the throughput by increasing the rotating bowl diameter and increasing the residence time within the rotating bowl lowers the water content of the sludge, but requires a large production cost of the rotating bowl, increases energy consumption for driving the rotating bowl, There is a problem that a large maintenance cost is required.

Third, if the speed of the vehicle is increased by lengthening the rotary bowl and installing a single screw, the cake moisture content may be lowered. However, if the differential speed of the rotary bowl is reduced too much, a carry over phenomenon may occur.

Fourthly, there is a method of controlling the deceleration rotation by controlling the current value consumed by the motor by manually rotating the gear box of the conventional horizontal centrifugal separator according to the set rotation speed of the deceleration rotation. The system detects the torque generated at the vehicle speed side while rotating the rotational load applied to each of the two rotating bodies on each of the two rotating rotors by different rotations in one rotating body, There are problems that the rotation can not be controlled and the precision of the vehicle speed control is lowered.

Therefore, there is a need to improve this.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide an apparatus and a method for reducing the sedimentation solids retention time by decreasing the diameter of the long bowl and increasing the length of the horizontal part of the long bowl, To increase the consolidation force (M), to reduce the load while increasing the sedimentation solids conveying speed with the first spiral wing and the second spiral wing of the double screw conveyor for the settled solids, and through the first spiral wing and the second spiral wing, The feed pressure P of the sedimented solids is increased by narrowing the pitch interval and the dehydration efficiency of the solids is remarkably increased by the shearing force T acting on the inclined inner surface of the cone portion of the long bowl when the conveyed solids are conveyed, By reducing the diameter of the rotating ball to the existing length and making the length longer, it is possible to reduce the rotating inertia of the rotor, Is to provide a number of mounting double screw equilibrium centrifugation and concentrated to a dehydrator to reduce it is an object.

A horizontal centrifugal separating and dehydrator equipped with a double screw according to the present invention is characterized in that it comprises: an upper water outlet and a solids outlet formed of a rectification type so that the input is introduced into the center of the horizontal axis of the bowl and the center of the shaft, A long bowl comprising a horizontal portion of the same diameter and a conical portion whose diameter is reduced; A double screw conveyor rotatably inserted into the long bowl; A first spiral wing and a second spiral wing formed continuously in one direction along a spiral trace on a circumferential surface along the axial direction of the double screw conveyor; A first spiral wing and a second spiral wing for forcibly transferring solids separated from the supplied sludge toward the solids discharge port; A supernatant discharge passage formed discontinuously in the first and second helical wings so as to allow the supernatant to flow in a direction opposite to the conveying direction of the solids so as to discharge a supernatant separated from the sludge to the supernatant discharge port; And a second helical wing formed on the double screw conveyor in the same locus as the one helical wing along the axial direction, the second helical wing having: a conveying speed of the solid material which is settled on the inner bottom of the long bowl and transferred to the solenoid discharge port side, (P) is increased in the discharged solids by decreasing the screw pitch so that the water content is lowered to form a cake, and when the sedimented solid material is conveyed, the compression force (P) is increased while the screw pitch interval is narrow. .

The ratio D1 / L1 of the horizontal portion side diameter D1 of the long bowl to the length L1 of the horizontal portion is long in the range of 1/4 to 1/5. In the bowl horizontal portion by the centrifugal force, (M) increases and the screw pitch is narrowed by the first helical wing and the second helical wing to increase the pressing force (P), and the volume of the rotor is reduced by decreasing the diameter of the rotating ball, So that the energy consumption is reduced by reducing the rotational power.

The inclined angle a of the conical portion with respect to the horizontal portion is 8 to 10 degrees and the settling solids conveyed in the long bowl horizontal portion phase are maximally applied with the compaction force M and the compressive force P, And the shear force (T) applied to the solid matter by the first helical wing and the second helical wing on the inclined surface further increases.

The double screw conveyor is electrically connected to the torque proportional control controller so as to control proportionally using the vehicle speed load value of the vehicle speed motor even if the solids concentration of the sludge changes in order to maintain the water content of the solids at the setting value for the concentration use or dehydration. do.

As described above, the horizontal centrifugal separating and dehydrator equipped with the double screw according to the present invention has a structure in which the sludge introduction direction is made to be a rectification type (positive flow type) to reduce the diameter of the long bowl within the set ratio range, The length of the horizontal portion of the bowl is increased to increase the sedimentation solids retention time to increase the consolidation force (M) according to the centrifugal force (G), the double screw conveyor to increase the speed while reducing the conveyance portion, and the double screw conveyor The screw pitch interval for one helical wing and the second helical wing is narrowed to increase the sedimented solids conveying force M and the shear force T acting on the inclined inner side of the conical part of the long bowl By increasing the dewatering efficiency of the solid material significantly, it is possible to reduce the diameter of the rotating ball and to make the volume longer by increasing the length Minimizing the foundation of inertia may be reducing energy consumption, depending on the rotational power.

1 is a side cross-sectional view of a horizontal centrifugal concentrator and dehydrator equipped with a double screw according to an embodiment of the present invention.
2 is an outline view of a long bowl of a horizontal centrifugal separating and dehydrator equipped with a double screw according to an embodiment of the present invention.
3 is an interior view of a long bowl according to an embodiment of the present invention.
4 is a perspective view of a double screw conveyor having a plurality of spiral wings mounted to a long bowl according to an embodiment of the present invention.
FIG. 5 is a process flow chart of the proportional control of the vehicle speed of a horizontal centrifugal separating and dehydrator equipped with a double screw according to an embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a horizontal centrifugal separating and dewatering machine equipped with a double screw according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a side cross-sectional view of a horizontal centrifugal concentrator and dehydrator equipped with a double screw according to an embodiment of the present invention.

FIG. 2 is an outline view of a long bowl of a horizontal centrifugal separating and dehydrator equipped with a double screw according to an embodiment of the present invention, FIG. 3 is an internal view of a long bowl according to an embodiment of the present invention, 1 is a perspective view of a double screw conveyor having a plurality of spiral wings mounted on a long bowl according to an embodiment of the present invention.

FIG. 5 is a process flow chart of the proportional control of the vehicle speed of a horizontal centrifugal separating and dehydrator equipped with a double screw according to an embodiment of the present invention.

1 to 5, a horizontal centrifugal separating and dehydrator equipped with a double screw according to an embodiment of the present invention includes a casing 100, a long bowl 200, a double screw conveyor 300, Includes a first helical wing (310) and a second helical wing (320).

The casing 100 forms an outer shape of a horizontal centrifugal separating and dehydrating machine for separating solids and separating liquid (supernatant) from supplied sludge using centrifugal force and concentrating and dehydrating the solids, (A straight flow type) in which the feed pipe 400 is inserted at a distance from the center of the horizontal part 210 of the long bowl 200 so as to be equal to each other and the separation liquid discharge port 120 and the solids discharge port 110).

The separation liquid discharge port 120 is provided at one side with respect to the axial direction of the casing 100 to discharge the separated liquid separated from the sludge. In addition, the solids discharge port 110 is provided on the other side of the casing 100 to discharge the solid matter separated from the sludge.

Particularly, the casing 100 is supported on both sides of the frame 500 in the axial direction. In addition, the frame 500 is provided with the dustproof portion 600 at a portion contacting the ground, so that the frame 500 can absorb the vibration.

At this time, the anti-vibration part 600 may be variously applied to anti-vibration rubber or coil spring, and is coupled to the lower side of the frame 500 by various assembling methods such as bolting. Particularly, the dustproof portion 600 may be disposed at four or more places on each bottom surface of the pair of frames 500 for stably supporting the frame 500.

In addition, the separation liquid outlet 120 serves to discharge the separated liquid (supernatant) centrifugally separated from the sludge, and the solid material discharge port 110 discharges the solid material to be squeezed from the sludge. Accordingly, the separation liquid discharge port 120 and the solid matter discharge port 110 can be positioned below the casing 100 to induce a natural drop of the separated liquid and the solid matter by gravity, respectively.

In addition, the casing 100 may be disposed so as to be inclined upward or downward from the solids discharge port 110 to the separation liquid discharge port 120, or may be disposed parallel to the floor.

Meanwhile, the long bowl 200 is rotatably inserted into the casing 100. At this time, the long bowl 200 connects the large shaft 210 to the other side to serve as a rotation support shaft, and connects the small shaft 220 to one side. The large axis 210 and the small axis 220 are rotatably connected to the corresponding frame 500, respectively.

The frame 500 forms a bearing block 540 therein and the bearing block 540 rotatably connects the large diameter shaft 210 and the small diameter shaft 220 to each other.

Particularly, the bearing block 540 serves to smoothly rotate the long bowl 200 by minimizing the friction between the large diameter shaft 210, the casing 100, and the small shaft 120 and the casing 100.

In addition, a driving pulley 550 for transmitting a rotational force to the long bowl 200 is mounted on the small shaft 220. The large-diameter shaft 210 is provided with a vehicle speed regulator 560.

The vehicle speed regulator 560 includes a vehicle speed motor 530 that transmits the driving force for vehicle speed rotation while the power of the long bowl 200 and the double screw conveyor 300 are interlocked. In addition, the frame 500 connecting one side of the casing 100 has a gear box 510 therein.

At this time, the long bowl 200 is connected to the driving pulley 550 and receives power through a belt connected to the main motor 520. The drive pulley 550 may be connected to the main motor 520 by various power transmission devices. The main motor 520 is fixed to the frame 500.

The long bowl 200 is formed with a separation liquid outlet 250 connected to the separation liquid discharge port 120 and a solid discharge port 230 connected to the solid discharge port 110 and a supersonic discharge port 240 . That is, the long bowl 200 has an outlet port 250 formed at one side thereof and a solids discharge port 230 at the other side thereof. Particularly, one or more separation outlet ports 250 may be formed on one side of the long bowl 200 along the axial direction thereof, and the solids discharge port 230 may be formed on the other side along the axial direction of the long bowl 200 One or more of them may be formed. In addition, one or a plurality of the supernatant discharge openings 240 are formed on one side along the axial direction of the long bowl 200 forming the separating funnel outlet 250.

In particular, the long bowl 200 allows the supply of the sludge to one side adjacent to the supernatant outlet 240. Accordingly, the horizontal centrifugal separating and dehydrator equipped with the double screw according to the present invention is of the rectifying type.

In addition, the double screw conveyor 300 is rotatably inserted into the long bowl 200. The double screw conveyor 300 is rotated in the same direction as the long bowl 200 and can rotate at a different rotational speed from the long bowl 200. In particular, the long bowl 200 and the double screw conveyor 300 may be provided to rotate at a vehicle speed.

At this time, the casing 100 axially inserts the feed pipe 400 into one side. The feed pipe 400 is supported by the bearing block 540 of the frame 500 and functions to guide the external sludge into the double screw conveyor 300. Thus, the solids are transported in the direction in which they are supplied.

Particularly, a feed pipe 400 is fixedly inserted into one side of the casing 100, and is rotatably inserted into the long bowl 200 and the double screw conveyor 300. This is to prevent interference between the rotating long bowl 200 and the double screw conveyor 300.

In addition, the double screw conveyor 300 forms one or more sludge discharge openings 330 along the circumferential direction on the peripheral surface. The sludge discharge port 330 serves to guide sludge introduced into the double screw conveyor 300 into the long bowl 200 by centrifugal force.

At this time, the double screw conveyor 300 and the long bowl 200 rotate at different rotational speeds, so that the sludge discharged to the sludge discharge port 330 is separated and discharged from the sedimented solid material by the centrifugal force, .

As the sludge is centrifuged, the solids having a large specific gravity are attached to the inner wall of the long bowl 200, and the separated liquid having a small specific gravity flows along the circumferential surface of the double screw conveyor 300 in the direction of the separation liquid outlet 250, So that it sinks to the inner wall of the bowl 200.

The double screw conveyor 300 is enriched and dehydrated while rotating at a speed that is slower than the long bowl 200 by about 1 to 30 rpm / min.

In particular, the double screw conveyor 300 forms a spiral 1.2-th helical wing 310.320 which advances along the axial direction in one direction corresponding to the rotation direction.

The first and second helical wings 310 and 320 rotate together with the double screw conveyor 300 to increase the pressing force P between the screw pitches while conveying the solids toward the solids discharge port 230.

At this time, the separated liquid contained in the solid matter can be conveyed toward the solids discharge port 230 by the first and second helical wings 310, 320. In this case, the water content of the solid becomes high.

Thus, the 1.2 spiral wing 310.320 forms an upper water discharge passage 312 adjacent the surface of the double screw conveyor 300. At this time, the supernatant discharge passage 312 is formed in a non-contact manner along the first and second helical wings 310 and 320 so that the first and second helical wings 310 and 320 do not deform or break when the solids are forcibly transferred.

Therefore, the separated liquid contained in the solid material forcibly conveyed toward the solids discharge port 230 flows out to the separator outlet 250 along the supernatant discharge passage 312.

At this time, the sludge injected through the feed pipe 400 is settled on the inner surface of the long bowl 200 by the centrifugal force of the rotating long bowl 200.

Of course, one or more of the first helical wings 310 may be formed on the circumferential surface of the double screw conveyor 300 in the same direction, but one helical wing 310 is formed for convenience. In addition, the first helical wings 310 are formed along the entire circumferential surface along the axial direction of the double screw conveyor 300. At this time, the first helical wing 310 has a height such that the first helical wing 310 contacts the inner surface of the long bowl 200 at the time of rotation or is spaced apart from the inner surface of the long bowl 200 by a predetermined distance.

On the other hand, the double screw conveyor 300 has a second helical wing 320 which forms a helical locus in one direction on the circumferential surface along the axial direction. That is, the second helical wing 320 is formed to extend in the axial direction on the circumferential surface of the double screw conveyor 300 so as to be parallel to the first helical wing 310.

The second helical wing 320 also forms the supernatant discharge passage 312. The second helical wing 320 is formed on the inner bottom of the long bowl 200 to increase the conveying speed of the solids conveyed toward the solids discharge port 230, To reduce the load of the low-function cakes. At this time, the first helical wings 310 and the second helical wings 320 are formed in the same direction in the helical direction.

At this time, the long bowl 200 is divided into a horizontal portion 260 having the same diameter and a conical portion 270 having a gradually decreasing diameter toward the solids discharge port 230.

The first spiral wing 310 and the second spiral wing 320 corresponding to the area of the horizontal portion 260 are formed to have the same height close to the inner surface of the long bowl 200, The first spiral wing 310 and the second spiral wing 320 corresponding to the area of the long bowl 200 are formed at the same height close to the inner surface of the long bowl 200.

The first spiral wing 310 and the second spiral wing 320 are separated from the sludge at the inner side of the long bowl 200 and the solids precipitated at the inner wall of the long bowl 200 are reduced To the solids discharge port 230 side.

Thus, the solids settled to the inner wall of the long bowl 200 will have the effect that the first spiral wing 310 and the second spiral wing 320 of the double screw conveyor 300 have a compressive force (P) action between the spiral pitch distances and a centrifugal force Is separated from the separation liquid by the consolidation force M of the long bowl 200 and is conveyed in the direction of the solids discharge port 230 on the side of the conical portion 270 of the long bowl 200 and is subjected to a shearing force T action by the inclined surface of the conical portion 270 Thereby further reducing the function of the discharged solid matter.

As shown in [Table 1] below, the centrifugal force is reduced by about 200 G and the reduction ratio is reduced by 8% when the distance from the central axis is about 1 cm.

[Table 1]

As a result, the heavy solids settled to the inner wall of the long bowl 200 are conveyed to the conical portion 270 by the spiral action and the centrifugal pressure of the first spiral wing 310 and the second spiral wing 320, The light solids in the upper layer conveyed to the upper portion 270 are further passed through the horizontal portion 260 through the first helical wings 310 and the second helical wings 320 to further increase the centrifugal force, And discharged continuously to the discharged solids discharge port 230 as in the case of heavy sedimentation solids,

As shown in [Figure 1], the sludge particles settled on the inner wall of the long bowl 200 are accumulated in the long bowl 200 and conveyed by the double screw conveyor 300 to be dehydrated. (P) received between the screw pitches of the first spiral wing (310) and the second spiral wing (320) adjacent to the double screw conveyor (300) during the conveying operation, the consolidation force 200) Shear force (T) due to slip of solids acts on the inclined surface of the conical part (270).

It is assumed that the ratio D1 / L1 of the diameter D1 of the long bowl 200 side to the length L1 of the horizontal portion of the long bowl 200 is in the range of 1/4 to 1/5.

The total length L in the axial direction of the long bowl 200 is longer than the total length W of the long bowl 200 and the diameter D1 of the long bowl 200 on the horizontal portion 260 side is longer than the total length W of the long bowl 200, Is smaller than the diameter B1 of the existing same region (D1 < B1). At this time, it is assumed that the total internal volume of the long bowl 200 and the internal total volume of the conventional rotary bowl are similar.

Particularly, by setting the ratio D1 / L1 of the diameter D1 of the long bowl 200 to the horizontal portion 260 to the length L1 of the horizontal portion in the range of 1/4 to 1/5, When the length L of the long bowl 200 is longer than the total length W of the long bowl 200 in a state in which the first spiral 310 and the second spiral wing 320 have a length close to the inner surface of the long bowl 200, And the diameter D1 of the horizontal portion 260 is smaller than the diameter B1 of the same portion as the diameter of the solid portion is gradually increased toward the conical portion 270 in the horizontal portion of the long bowl 200 And the consolidation force M due to the centrifugal force is increased. In addition, the double screw conveyor 300 has a narrow pitch due to the first helical wing 310 and the second helical wing 320, thereby increasing the pressing force P while transferring the solid material thickly.

If the ratio D1 / L1 of the diameter D1 of the long bowl 200 to the horizontal portion 260 and the length L1 of the horizontal portion is less than 1/4, By making the diameter D1 at the side of the contrast horizontal part 260 too small, the volume is reduced and the throughput is limited.

Conversely, if the ratio D1 / L1 of the length D1 of the long bowl 200 side to the length L1 of the horizontal portion 260 exceeds 1/5, the diameter D1 of the horizontal portion 260, Since the first spiral wing 310 and the second spiral wing 320 and the long bowl 200 have to have a large volume by increasing the length L1 of the horizontal length 260, And the cost of production is significantly increased.

When the length L1 of the horizontal portion 260 is less than 1/4 of the set diameter D1, the first and second helical wings 310 and 320 are rotated in such a direction that the solidification force M of the solids transferred by the first and second helical wings 310 and 320, And the pressing force P decrease.

On the contrary, when the length L1 of the horizontal portion 260 is larger than 1/5 of the set diameter D1, the volume (length) of the long bowl 200 becomes too large.

On the other hand, the inclination angle a of the conic section 270 with respect to the horizontal section 260 is set to 8 to 10 degrees. As a result, the moisture content of the discharge cake is remarkably lowered, and defective conveyance of the dewatering cake is prevented.

Particularly, at the inclined inner surface of the conical portion 270 of the long bowl 200, the sedimented solid is moved by the first helical wing 310 and the second helical wing 320 to be transported toward the solids discharge port 230 side Due to the inclined inner side surface, an action to be refluxed occurs, so that a shearing force (T) occurs and the dehydration rate increases.

At this time, when the inclination angle a of the conic section 270 with respect to the horizontal section 260 exceeds 10 degrees, the shear force T acting on the solid material becomes large, and the solid matter discharge is reduced.

On the contrary, when the inclination angle a of the conic section 270 with respect to the horizontal section 260 is less than 8 degrees, the dehydration efficiency of the solid material decreases as the shearing force T acting on the solid material decreases.

Particularly, since the double screw conveyor 300 and the torque proportional control controller 566 rotate the vehicle at a higher speed than the long bowl 200, the control of the vehicle speed is performed by controlling the centrifugal pressure and the charged solid concentration of the sludge, The torque-proportional control controller 566 reduces the function of the crush discharge speed.

That is, the vehicle speed regulator 560 is connected to the vehicle speed motor 530, and the vehicle speed motor 530 is electrically connected to the vehicle speed motor inverter 562 and the controller 566. Thus, the braking current corresponding to the concentration of the sludge, the settled solids discharge pressure, and the conveying torque is applied to the vehicle speed motor 530 through the vehicle speed regulator 560 to the vehicle speed inverter 562, The controller 566 compares the set range with the deviation and instructs the vehicle speed motor 530 to set the vehicle speed.

A variable torque load is applied to the double screw conveyor 300 according to the sludge concentration to be injected. The load torque is transmitted to the vehicle speed regulator 560. The mechanical load torque transmitted to the vehicle speed regulator 560 is transmitted to the connected vehicle speed motor 530 and the vehicle speed inverter 562 and is subjected to feedback proportional control by the torque proportional control controller 566,

In particular, the torque proportional control controller 566 controls the rotational speed of the vehicle speed motor 530 in accordance with the change in the sludge concentration to be injected.

At this time, the inputted two rotational speeds RPM are numerically expressed by the vehicle speed proportional control equation, and the control current of the vehicle speed motor 530 is proportionally controlled according to the difference of the value (i.e., the rotational speed value). That is, the rotational speed of the vehicle speed motor 530 is continuously controlled in order to maintain the discharge cake at a constant level even if the concentration of the input sludge varies from time to time.

Accordingly, the sedimentation solids of the horizontal centrifugal separating and dehydrator equipped with the double screw according to the present invention can be discharged by adjusting the consolidation force according to the centrifugal force acting on the inner surface of the long bowl 200 and the discharge amount The sedimentation solids are discharged.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the true scope of the present invention should be determined by the following claims.

100: casing 110: solid outlet
120: Separation solution outlet 200: Long bowl
230: solids discharge port 250: separator outlet
300: Double screw conveyor 310: 1st helical wing
312: supersonic discharge passage 320: second helical wing
400: feed pipe 500: frame
510: gear box 520: main motor
530: Vehicle speed motor 540: Bearing block
550: drive pulley 560: vehicle speed adjuster
562: vehicle speed motor inverter 564: main motor inverter
566: Torque proportional control controller
600:

Claims (3)

A horizontal portion having the same diameter along the axial direction and a conical portion having a reduced diameter, the upper portion being formed in a rectilinear shape so that the direction of the input and the direction of discharging the solid are the same, A long bowl for allowing the supply of the sludge to one side adjacent to the discharge port; A first spiral wing and a second spiral wing are formed on the circumferential surface along the same spiral locus so as to convey the solids separated from the sludge supplied to the inside of the long bowl to the solid bowl in the circumferential direction, A double screw conveyor forming a spiral wing; A first spiral wing and a second spiral wing so as to allow the supernatant to flow in a direction opposite to the conveying direction of the solids so as to discharge a supernatant separated from the sludge to the supernatant discharge port, And a discharge passage,
The double screw conveyor is electrically connected to the torque proportional control controller so as to control the proportional control using the vehicle speed load value of the vehicle speed motor even if the solids concentration of the sludge changes from time to time in order to maintain the water content of the solids at a set value,
Wherein the inclined angle a of the conical portion with respect to the horizontal portion is comprised between 8 and 10 degrees and comprises an inclined surface of the conical portion and is composed of the first screw wing and the second screw of the second helical wing so that the settled solids conveying speed is While increasing the compression force P applied to the solids conveyed in the direction of the solids discharge port while increasing the pitch of the screw while increasing the dehydration rate through the generation of the shearing force T,
The ratio D1 / L1 of the horizontal part side diameter D1 of the long bowl to the length L1 of the horizontal part is set in the range of 1/4 to 1/5, As the diameter D1 of the horizontal portion becomes smaller than the diameter B1 of the existing portion as the diameter D1 of the horizontal portion becomes longer than the existing total length W, Is formed to be long and thick to increase the consolidation force (M) by the centrifugal force,
The solids moving in the direction of the solids discharge port along the axial direction to the double screw conveyor through the supernatant discharge passageway and being settled on the inner bottom of the long bowl will have a pitch due to the first helical wings and the second helical wings By making a function cake by increasing the feed force (P) by narrowing it, it is possible to minimize the inertia of the rotor, reduce the rotational power and reduce the energy consumption,
The long bowl is rotated together with the frame having the dustproof part, the large shaft is connected to the other side to serve as a rotation support shaft, the small shaft is connected to one side of the long bowl,
Wherein the second helical wing is formed in an axial direction on the circumferential surface of the double screw conveyor so as to be parallel to the first helical wing. delete delete

Images