JPS6247586B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a classifier for continuously separating solids from turbid or other suspensions containing solids such as sand, particularly a drum-type rotary classifier. be.

In general, rotary classifiers use sedimentation and sedimentation by gravity as a method of separating solids from turbid water containing solids such as sand, and the difference between the raw water inflow velocity and the raw water concentration that can be classified is Because of the close relationship between the two, it was difficult to freely design the airframe structure, making it impossible to achieve high efficiency.

In particular, a series of improved rotary classifiers have been proposed in Japanese Patent Application Laid-Open No. 49-124671, but the structure of this conventionally known rotary classifier has a helical shape on the inside as shown in Figure 1. It consists of a double cylinder consisting of a rotating drum 1 to which a feeding blade 2 is fixed, and a charging chute 3 fixedly installed in the drum 1 with a support 31 concentrically with the drum. A plurality of dewatering blades 6 are provided with a discharge chute 5 and are fixedly arranged radially on the discharge chute 5.
and a discharge port ring 7, etc., are fixedly installed in the relative positions shown in the figure, and are forced to face the discharge gutter 11, and if necessary, a full ring 8 is fixedly installed between the discharge chute 5 and the input chute 3. The drum front wall 9 of the drum 1 is annular and forms an outlet for the waste water of the classifier, and also defines the water level within the drum 1. The raw water inflow gutter 10 is opened to the cylindrical input chute 3, and the raw water is supplied to the outer drum 1 after passing through the input chute 3.

That is, the solid content in the raw water gradually settles in the water that has accumulated at the bottom of the drum, is sent to the discharge side by the feed blade 2, is scraped up to the top of the drum when it reaches the discharge end, and is swept up to the top of the discharge chute 5. The water is further guided by dewatering blades 6 to separate water, slide down the slope of the discharge chute 5, fall from the discharge port ring 7 to the discharge gutter 11, and be discharged. It flows out from the opening in the front wall 9.

Therefore, in the processing operation of such a classifier, the rear end of the input chute 3, which serves as the inner cylinder, must be placed as close to the solid material discharge end as possible, and the total length of the input chute 3 becomes long, and in practice It is common to have a tapered circumference with a thicker end to increase the flow velocity from one end to the other, but this taper cannot be made too large due to the size of the entire fuselage. As a result, the flow rate of the raw water in the input chute is relatively slow, so that undesirable sedimentation begins in section A shown in the figure. Since there are no blades in this part, once it has settled down, it will not be carried away by rotation, and even if spiral blades were attached to it, it would repeatedly move at the bottom and the sending effect would be low. On the other hand, when it leaves the input chute 3 and falls into the raw water reservoir at the bottom of the drum, when it falls violently, it causes turbulence in the raw water reservoir, and the solids that have been settling are thrown up again, extremely deteriorating the separation efficiency.

Therefore, in this type of classifier, in order to avoid the accumulation of part A, the faster the flow rate in the input chute, the better, and the slower the flow rate at the time of falling, the contradictory design conditions are created, which makes the design extremely difficult. Undesirable deposits inevitably occur in the A section, and in many cases, complicated operational management is forced, such as using raw water with strict restrictions on the amount of raw water flowing in, its concentration, etc.

The present invention aims to accurately eliminate these conventional drawbacks, and uses a new concept to overcome the difficulties in designing conventional classifiers, greatly increasing the degree of freedom in design, and achieving high efficiency. The purpose is to provide a classifier that is easy to manufacture and inexpensive.

Another object of the present invention is to significantly expand the scope of application without being restricted by processing solutions or conditions of use.
The objective is to create a rotary classifier that can simplify operation management.

The present invention is provided with a rotatable drum having a separated liquid outlet and a solids discharge port opened at both ends, and a helical sending blade for transferring the solids toward the discharge port on the inner surface of the drum. A rotary classifier comprising a hollow cone-shaped part for discharging solids, which has an open end at one end, is fixed to the discharge port, and the cone-shaped discharge part is constituted by a pyramidal tube having open ends at both ends. , one of the opening ends is used as an opening for inflowing raw water, a collision plate is provided inside the pyramid cylinder facing this opening, and the raw water flowing through the opening hits the collision plate and flows in. The present invention is characterized in that a deceleration member is provided and annular members are arranged overlappingly on the outer periphery of the discharge side of the pyramidal cylinder with a gap therebetween.

Embodiments of the present invention will be described with reference to FIGS. 2 to 5. The drum 1 is rotatably equipped with a separated liquid outlet 19 and a solid matter outlet 18 at both ends. A spiral feeding blade 2 is fixedly installed inside the drum 1, and a polygonal pyramid-shaped discharge chute 5 is provided at one end of the drum 1 on the solid material discharge port 18 side. The discharge chute 5 has open ends at both ends thereof, and an input tube 13 having a flange 13'.
is formed at one open end and led out from the drum 1. In order to supply raw water into the drum 1, a raw water inflow gutter 10 is installed on the solid matter discharge side of the drum 1, inserted into the input port cylinder 13, and opened into the discharge chute 5, and has an input port. Cylinder 13
Inside is a leak-stop wall 1 that prevents raw water from leaking to the discharge side.
3'' is attached to close the inlet pipe 13 and close the open end of the discharge chute 5, and to fix the collision plate 14 to the center of the discharge chute 5 so as to face the inflow front of the raw water flowing into the raw water inlet trough 10. Set up

Further, a ring-shaped baffle plate 15 is fixedly installed on the inner circumferential side of the discharge chute 5 in a direction to obstruct the water flow, and a plurality of dewatering blades 6 are radially arranged on the outer circumferential side.
are provided as partition members as necessary. The baffle plate 15 can be a flat plate or a perforated plate, or can be made by regularly or irregularly arranging rods or plates, but in any case, it obstructs the water flow and takes away its energy. Any device may be used as long as it calms the impact, and it is provided in combination with the collision plate 14. If necessary, they may be provided in multiple stages along the inside of the slope of the discharge chute 5, or a plurality of types of members may be installed in a mixed manner. Further, as the collision plate 14, a concavo-convex plate, a perforated plate, a distribution plate, etc. can be selected and used.

Note that there is a separate board 1 other than the board 15.
Drum 1 or drums 6 are installed at appropriate intervals on the sewage discharge side from the full plate 15.
It is also effective to arrange that the water surface 17 of the raw water stored inside is also within the plane of this baffle plate 16. This may cause some ripples on the water surface during the raw water flow path, so another Batsuful board 1
6 is installed to cover the rippled water surface with a full board 15,
By confining it between 16 and 16, a rational arrangement can be achieved.

Further, the discharge chute 5 made of a pyramidal cylinder has a discharge port ring 7 which is an annular member inclined in the opposite direction and is provided so as to face each other with a gap to form a double cylinder. This is necessary in order to guide the solids falling from the discharge chute 5 of the cone-shaped part into a predetermined discharge gutter 11 without scattering them in all directions even when the drum rotates. Even if there is no solid material discharge port 18, it can be effectively used and is provided in the drum 5 with the solid matter discharge port 18 opening into the discharge gutter 11.

In the figure, 14', 15', 16' are the collision plates 14,
Respective support legs for the buttful plate 15 and the buttful plate 16; 20 is a drive device for rotating the drum; 21
is a chain, 22 is a tire, 23 is a support roller, 2
4 is a bearing, 25 is a drainage gutter, and 26 is a raw water receiving tank.

The interior of the discharge chute 5 that receives the raw water from the raw water inflow gutter 10 also serves as a raw water input chute, and its bottom surface is steeply sloped to allow sediment to fall automatically. Since the influence of disturbance caused by the water flow leaving the chute on the raw water reservoir at the bottom of the drum is minimized, it is easily possible to obtain design freedom and improve the efficiency of the entire machine.

In addition, if the discharge chute 5 is undesirable due to flow rate, wear, etc., instead of using both slopes of the chute, the front and back surfaces of the outer and inner surfaces may be made separate, respectively. It is also possible to fabricate a double structure to provide the optimum angle of inclination.

If raw water is supplied from the raw water inflow gutter 10, if the inflow velocity is low, it will flow directly inside the pyramidal cylinder discharge chute 5, and if the inflow velocity is high, it will collide once with the collision plate 14 and the buttful plate 15. It flows down inside the discharge chute 5, losing most of its velocity energy. Since the inner slope of this discharge chute 5 is large, the flow rate is increased, and solid content in the raw water is less likely to settle during charging.

That is, the raw water flowing down the discharge chute 5 passes through the collision plate 1
4, the flow is highly turbulent, so sedimentation is difficult to occur, and even if it occurs, the slope angle of the discharge chute 5 does not allow sediment to accumulate or accumulate, so the sediment immediately passes through the baffle plate 15. Then, the solids settle between the feeding blades 2, 2 in the drum 1, which is the original deposition place, and are transferred to the solids discharge port 18 side.

Further, the turbulent raw water flowing down the discharge chute 5 becomes a finer turbulent flow by the raw water inflow slowing members such as the baffle plates 15 and 16 and flows into the raw water reservoir, thereby performing a settling action. The impact of stirring up raw water is kept to a minimum. On the solids discharge side of the drum 1, the solids thus carried upwards fall directly onto the surface of the discharge chute 5 and are led out of the discharge ring 7 and the discharge trough 11. That is, the discharge port ring 7 guides the solid matter falling from the discharge chute 5 into a predetermined discharge gutter 11 without scattering it in all directions even when the drum rotates.
On the other hand, the separated liquid obtained by sedimentation and separation of the solid matter is led out from the separated liquid outlet 19 at one end of the drum 1, and is discharged from the discharge gutter 25.
be disposed of after

With the present invention, the inflow speed of raw water on the input chute and the discharge speed were inseparable from each other in the past, but since the two can be designed freely and completely unrelated, the range of usage conditions has been widened and the scope of application of the machine has been expanded. Not only can it be expanded significantly, it is also easy to design a machine that is optimal for the raw water used, so the efficiency of the machine is greatly increased and efficient classification work is possible.Moreover, its structure is extremely simple, making manufacturing, maintenance, and safety extremely easy. It is easier to use, uses less material than the conventional type, is lighter, reduces operating power, and contributes to energy and resource conservation. Even when the drum rotates, the solids are guided to the discharge gutter without being scattered in all directions, and the solids are properly guided out of the drum, preventing them from falling into the drum. The solid material discharge and raw water inflow can be separated, concentrated, and carried out accurately without any waste, and the lacquer discharge chute can also be deployed separately, making the configuration compact and simple, and convenient for manufacturing.
There is an advantage that operation and management can be facilitated without severe restrictions on operation.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a conventional rotary classifier, Fig. 2 is a longitudinal cross-sectional view of an embodiment of the present invention, Fig. 3 is a front view showing the state of use, and Fig. 4 is a rear view thereof.
FIG. 5 is a side view thereof. DESCRIPTION OF SYMBOLS 1...Drum, 2...Feeding blade, 3...Input chute, 4...Drum rear wall, 5...Discharge chute, 6...Dewatering blade, 7...Discharge port ring, 8...
...Batsuful ring, 9...Drum front wall, 10...
Raw water inflow gutter, 11...Discharge gutter, 13...Inlet tube, 13'...Flange, 13''...Leak stop wall, 1
4... Collision plate, 14', 15', 16'... Support leg,
15, 16... Batsuful board, 17... Raw water surface, 1
8... Solid matter outlet, 19... Separated liquid outlet, 2
0... Drive device, 21... Chain, 22... Tire, 23... Support roller, 24... Bearing, 25...
...Drainage gutter, 26...Raw water receiving tank, 31...Strut.

Claims (1)

[Scope of Claims] 1. A rotatable drum having a separated liquid outlet and a solids discharge port opened at both ends, and a helical feed blade for transferring the solids toward the discharge port on the inner surface of the drum. In a rotary classifier, the solid material discharge cone-shaped part is hollow and has an open end at one end and is fixed to the discharge port, and the discharge cone-shaped part is composed of a pyramidal tube having open ends at both ends. One of the opening ends is used as an opening for inflowing raw water, and a collision plate is provided inside the pyramidal cylinder facing this opening, and further the raw water flows through the opening and hits the collision plate. A rotary classifier characterized in that a flowing water deceleration member is provided and annular members are arranged overlappingly on the outer periphery of the discharge side of the pyramidal cylinder with a gap therebetween. 2. The classifier according to claim 1, wherein the pyramidal cylinder is provided with an inlet cylinder having a leak-stopping wall. 3. The classifier according to claim 1 or 2, wherein the flowing water reducing member is a perforated plate. 4. A plurality of the flowing water reducing members are provided at appropriate intervals on the inner wall of the conical part on the separated liquid discharge side, and at least one of them is arranged with its lower end located below the surface of the raw water stored in the drum. A classifier according to any one of claims 1 to 3, wherein the classifier is a classifier according to any one of claims 1-3.