JP3024355U - Vertical screw centrifuge - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: When the undiluted solution moves to the screw blade, it can flow while being evenly distributed in the circumferential direction, the solid-liquid separation performance is good, and the apparatus is stable without vibration. Provided is a vertical screw centrifuge having a structure that enables stable operation and is easily repaired. SOLUTION: A rotating inner body (3) having screw blades (5) attached to its outer surface includes an upper half (3a) and a lower half (3).
b) having a plurality of radially arranged flow dividing rib plates (4) for connecting and vertically dividing and transferring the flow of the receiving liquid, each of the opposite corners of the upper half part and the lower half part The flow dividing rib plate is fixed to the groove of the taper portion formed in.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a vertical screen centrifuge that separates and collects solids and liquids from various drainages.

[0002]

[Prior art]

 FIG. 4A is a schematic sectional view of the central main part of an embodiment of a conventional vertical screw centrifuge, and FIG. 4B is a plane sectional view taken along the line CC ′ of FIG. .

Conventionally, various centrifugal separators have been used for returning water sludge in sewage treatment or for dredging drainage of sludge from bays, rivers, lakes, etc., solid-liquid separation of coal mining drainage and various sludges, or clarification of fats and oils. Has been developed.

In particular, sewage treatment is based on solid-liquid separation, and a method for treating and disposing of sewage sludge as a pollutant involves the basis of sewage treatment. The annual amount of sewage sludge generated in Japan is 300 million cubic meters, which is expected to increase by 5.5% per year. The characteristic of sewage sludge is that it has high organic matter and water content, and it is important to remove water content by solid-liquid separation in order to achieve the principle of waste treatment [reduction and stabilization]. By the way, sludge is inevitably generated by sewage treatment, and if landfill is used as the final disposal of waste, landfills will be infinitely necessary and eventually it will be in need. In fact, securing the final disposal site is becoming difficult year by year. When considering limited global resources, effective use of sewage sludge is a socially essential issue. From the perspective that sewage itself is a concentrated and valuable organic resource, the contaminated part of this organic resource is removed, the inorganic part is used as a material, and the solid-liquid separated water can be reused by chemical treatment. Becomes

Therefore, there are great expectations for the improvement of the technology of the above-mentioned centrifugal separator.

In the conventional vertical screw centrifuge shown in FIGS. 4 (a) and 4 (b), there is a slight gap between the rotating outer barrel 52 and the rotating inner barrel 53 to which the screw blades 55 are attached. A gap is provided, and the rotation speed of the former is made slightly higher than that of the latter. The upper half of the rotating inner case 53 is attached with its lower part inclined outward. Four slender flow receiving rib plates 54 are fixed to the inner space of the upper half of the inner rotating body 53 at equal intervals in the circumferential direction, and the upper and lower ends are inclined inwardly at the lower side. The four stock solution transfer ports 60 are opened at the same radial position as the receiving rib plate 54 at the lower end of the upper half of the inner case 53.

When the stock solution is supplied from the supply port at the lower end of the stock solution supply pipe 56 in the central portion to the space inside the upper half of the rotating inner barrel 53, the stock solution hits the four elongated receiving rib plates 54. Then, the liquid in which the solid matter contained is atomized passes between the flow receiving rib plates 54 and hits the inner rotating body 53. The liquid is turned here and sent to the screw blades 55 from the four stock liquid transfer ports 60 at the lower end of the rotating inner barrel 53. Solid and liquid are separated during the rotation of the screw blades 55, liquid is discharged to the outside of the device through the upper clearing liquid outlet 57 and solid is discharged from the lower sludge discharge port 58, respectively.

[0008]

[Problems to be solved by the device]

 In the above-mentioned conventional centrifugal separator, due to the structure of the flow receiving rib plate between the upper and lower inner cylinders, when the stock solution moves to the screw blade, it flows in a certain extension line shape. As a result, the force applied to the screw blades becomes non-uniform in the circumferential direction due to fluctuations in the molecular structure and concentration of the stock solution, and vibrations of the operating equipment tend to occur, and this vibration is repeated and damage occurs, forcing operation suspension. There were things.

Therefore, an object of the present invention is to allow the undiluted solution to flow between the upper and lower inner cylinders while being evenly distributed in the circumferential direction toward the screw blades, and to provide a vertical screw having a structure capable of stable operation. To provide a centrifugal centrifuge.

[0010]

A vertical screw type centrifugal separator according to the present invention has a rotating outer body having an upper half of a right cylindrical shape and a lower half of a tapered cylindrical shape whose diameter decreases downward. And a plurality of radially arranged flow dividing rib plates which are supported concentrically with the rotating outer body, connect the upper half and the lower half, and divide the flow of the receiving material vertically to transfer It is a rotating inner body, and a taper of a predetermined size is formed at each of the opposite corners of the upper half and the lower half, and the flow dividing rib plate has an upper edge and a lower edge that are outwardly extending along the taper. It is fixed to the outer peripheral surface of the rotating inner cylinder, which has a shape that spreads vertically upwards and downwards, and the outer peripheral surface of the rotating inner cylinder that is connected by flow distribution rib plates, and a small gap is formed on the inner peripheral surface of the rotating outer cylinder. Screw blades that consist of A stock solution supply pipe located at the lower end of the upper half of the transfer inner barrel, and a plurality of fins with adjustable opening provided on the top plate of the outer outer drum along the upper end of the inner peripheral surface of the upper half of the outer outer barrel. The liquid outlet, the sludge discharge port formed at the lower end of the rotating outer case, the rotating outer case and the inner rotating case in the same direction, and the rotating outer case slightly faster than the inner rotating case, within a predetermined range. And a rotation drive device capable of setting a speed difference and rotating the same, which allows continuous separation and recovery of solids and liquids.

[0011]

[Embodiment of device]

 As described above, the features of the embodiment of the present invention are that the upper half taper surface and the lower half taper surface of the rotating inner barrel are connected, and the flow of the received solid-liquid is divided vertically. A plurality of radially arranged flow dividing rib plates for transporting can evenly flow solid-liquid in the circumferential direction, and it is fixed between the outer edge of the screw vane and the inner surface of the outer shell. This is to facilitate the solid-liquid separation by forming a slight gap and setting the rotation speed of the outer cylinder to be slightly higher than the rotation speed of the inner cylinder.

Therefore, the device of the present invention can continuously separate the undiluted sludge water and the like continuously supplied, and collect the dehydrated solid matter obtained by the separation from the attached outer casing. On the other hand, the separated water can be reused because it can be collected through the drainage receiving chamber in the upper part of the outer casing. Also, when cleaning is to be performed after operation is stopped, the vertical structure allows solids to fall naturally due to gravity, which facilitates cleaning. Due to the uniform circumferential separation function of the undiluted solution, it has very few vibrations, saves space, improves economy, and saves resources.

[0013]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic vertical cross-sectional view of a main part of an embodiment of the vertical screw type centrifugal separator of the present invention, FIG. 2 is an enlarged vertical cross-sectional view of the rotary inner cylinder of FIG. 1, and FIG. 2A is a sectional view taken along line AA ′ of the flow dividing rib plate of FIG. 2, and FIG. 3B is a front view taken along line BB ′ of FIG.

The vertical screw type centrifugal separator 1 of this embodiment comprises a rotating outer cylinder 2, an inner rotating cylinder 3 having a screw blade 5 and a flow dividing rib plate 4, a stock solution supply pipe 6, and a clearing solution outlet. 7, a sludge discharge port 8, and a drive device 9 for the rotating outer case and the inner case.

The rotating outer case 2 has an upper half portion 2a having a right cylindrical shape and a lower half portion 2b having a tapered cylindrical shape whose diameter decreases downward.

The inner rotating body 3 is supported concentrically with the outer rotating body 2, and is connected to the upper half 3a, the lower half 3b and four of them for connecting these and vertically dividing the flow of the receiving liquid. Has diverting rib plates 4a, 4b, 4c, 4d arranged in the radial direction of, and a taper of a predetermined size is formed at each of the opposite corners of the upper half 3a and the lower half 3b. Four grooves 3c for fixing the flow dividing rib plate are radially engraved on the taper portion.

The flow dividing rib plate 4 has a shape that spreads vertically toward the outside so that the upper edge and the lower edge are fixed along the above-mentioned taper.

The screw blades 5 are fixed to the outer peripheral surface of the rotating inner case 3 connected by the flow dividing rib plate 4, and the outer peripheral edge of the screw blade 5 forms a small gap on the inner peripheral surface of the rotating outer case 2.

The undiluted solution supply pipe 6 extends downward from the center of the inner rotating body 3 to the center thereof, and the opening at the lower end is located at the lower end of the upper half 3a of the inner rotating body.

The plurality of clarified liquid outlets 7 are provided on the top plate of the outer rotating body along the upper end of the inner peripheral surface of the upper half of the outer rotating body, and have a structure capable of adjusting the degree of opening.

The sludge discharge port 8 is formed at the lower end of the rotating outer case 2.

The rotation driving device 9 uses a motor and a transmission mechanism (not shown) so that the outer rotating body 2 and the inner rotating body 3 are in the same direction, and the outer rotating body 2 is slightly faster than the inner rotating body 3 in a predetermined manner. It is equipped with a function that can set and rotate any speed difference within the range.

Next, the operation of this embodiment having the above structure will be described.

The stock solution containing the solid matter supplied from the stock solution supply pipe 6 is different from the four circumferential flow receiving rib plates 54 described in the conventional example by the four radial flow dividing rib plates 4. The flow is evenly divided or divided, and the solid molecules are cut by high-speed operation, so the performance of separating the solid and liquid is greatly improved, and the clarity of the discharged liquid is increased. In the stock solution smoothly supplied to the screw blade 5, liquid and solid are separated into upper and lower parts while the screw blade 5 is rotated, the clear liquid 11 is from the upper clear liquid outlet 7, and the sludge 12 is the lower sludge. Each is discharged from the discharge port 8 to the outside of the machine.

[0026]

[Effect of device]

 As described above, the present invention connects the upper half taper surface and the lower half taper surface of the rotary inner cylinder and arranges them in a plurality of radial directions for vertically dividing the flow of the received solid-liquid. The divided flow dividing rib plate allows the solid-liquid to flow evenly in the circumferential direction, and the molecules of the contained solid are subdivided by the dividing flow dividing rib plate that rotates at high speed. By forming a slight gap between the outer edge and the inner surface of the outer cylinder and setting the rotation speed of the outer cylinder slightly higher than the rotation speed of the inner cylinder, solid-liquid separation can be facilitated and vibration can be reduced. There is an effect that it is possible to provide a vertical screw type centrifuge having a structure that can be operated stably in a small amount and is easily repaired.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a main part of an embodiment of a vertical screw type centrifugal separator of the present invention.

FIG. 2 is an enlarged vertical sectional view of the inner rotating body of FIG.

3A is a sectional view taken along line AA ′ of the flow dividing rib plate of FIG. 2, and FIG. 3B is a front view taken along line BB ′ of FIG.

FIG. 4 (a) is a schematic cross-sectional view of a central main portion of an example of a conventional vertical screw type centrifugal separator, and FIG.
It is a plane CC 'line sectional view of (a).

[Explanation of symbols]

 1 Vertical screw type centrifuge 2,52 Rotating outer body 2a Upper half 2b Lower half 3,53 Rotating inner barrel 3a Upper half 3b Lower half 3c Groove 3d Inner barrel drive shaft. Undiluted solution supply pipe mounting port 3e Lower stable shaft mounting port 4,4a, 4b, 4c, 4d Dividing rib plate 5,55 Screw blade 6,56 Undiluted solution supply pipe 7,57 Clearing liquid outlet 8,58 Sludge discharge port 9 Rotational drive device 10,60 Undiluted solution transfer port 11 Clarifying solution 12 Sludge 54 Receiving rib plate

Claims (1)

[Scope of utility model registration request] 1. A rotating outer body (2) having an upper half portion (2a) of a straight cylindrical shape and a lower half portion (2b) of a tapered cylindrical shape having a diameter decreasing downward, and the rotating outer body. Dividing rib plates (4) concentrically supported and arranged in a plurality of radial directions for connecting the upper half part (3a), the lower half part (3b) and connecting them and dividing the flow of the receiving liquid vertically. In the rotating inner body (3) having the above-mentioned structure, a taper of a predetermined size is formed at each of the opposite corners of the upper half part and the lower half part, and the diversion rib plate has upper and lower edges. The inner rotating body (3) having a shape that expands vertically toward the outside along the taper is fixed to the outer peripheral surface of the inner rotating body connected by the flow dividing rib plate, and the outer peripheral edge is A screw blade (5) formed by forming a slight gap on the inner peripheral surface of the outer rotating body, and above the inner rotating body. From the central part of the rotary inner cylinder to the lower part of the upper half of the inner part of the rotating inner body, and the outer circumference of the upper half of the outer part of the outer rotating body along the upper end of the inner peripheral surface. Multiple clearing liquid outlets (7) provided on the body top plate with adjustable opening
And a sludge discharge port (8) formed at the lower end of the rotating outer case
And a rotary drive capable of rotating the outer outer cylinder and the inner inner cylinder in the same direction, and the outer outer cylinder slightly faster than the inner inner cylinder by setting an arbitrary speed difference within a predetermined range. A vertical screw centrifuge (1) comprising a device (9) and capable of continuously separating and recovering solids and liquids.