KR101731717B1

KR101731717B1 - Centrifugal separator capable of selective separation using specific gravity

Info

Publication number: KR101731717B1
Application number: KR1020150120703A
Authority: KR
Inventors: 권중혁
Original assignee: 주식회사 동서
Priority date: 2015-08-27
Filing date: 2015-08-27
Publication date: 2017-05-02
Also published as: KR20170024977A

Abstract

The present invention relates to a centrifugal separator, and more particularly, to a centrifugal separator for separating an industrial waste slurry into a supernatant liquid and a solid matter in a reverse osmosis body in which a conical upper rotary body and a cylindrical lower rotary body are vertically formed, By forming a delay hole in the delay blade of the screw conveyor and increasing or decreasing the pitch between the delay blades, the industrial waste slurry undergoes a centrifugal force in the case and increases the moving path, thereby causing not only heavy and bulky solids but also during polishing To a centrifugal separator capable of selective separation using a specific gravity difference which makes it possible to efficiently separate relatively light and bulky solids such as diamond powder, sapphire powder or copper powder.

Description

TECHNICAL FIELD [0001] The present invention relates to a centrifugal separator capable of selective separation using specific gravity difference,

Generally, industrial waste slurries generated during various processes are separated by using a centrifuge to recover the solids contained in the liquid, thereby obtaining a supernatant or solids and then recycling them.

The centrifugal separator used for recycling the industrial waste slurry is a device for separating the substances constituting the industrial waste slurry into the supernatant liquid and the solid material depending on the specific gravity difference by the centrifugal force generated while rotating at high speed. It can be said that the performance is determined by the magnitude of the centrifugal force determined by the rotation speed of the centrifugal separator.

Such conventional centrifugal separators are disclosed in Korean Patent No. 10-1152176 entitled " Centrifuge Having Built-in Deceleration Unit ", Korean Patent No. 10-0867762 "Screw Tecker Type Centrifuge Enhancing Fine Sludge Removal Efficiency & The supernatant liquid is separated and discharged to the supernatant discharge hole installed in the rotating body by using the specific gravity difference. The solids are fixed to the inner circumferential surface of the rotating body by centrifugal force at a high specific gravity and then separated and discharged by a screw conveyor rotating at a speed different from that of the rotating body In this case, the waste slurry supplied into the rotating body is discharged to the solids discharge hole before it is separated into the supernatant liquid and the solid matter at a constant rotation speed, or the supernatant liquid does not have a sufficient rotational speed, The solid material separation efficiency is lowered as it is discharged to the discharge hole There is a problem.

Accordingly, as disclosed in Korean Patent No. 10-1446588 entitled " Vertical centrifugal separator equipped with a bearing air block ", the present applicant has proposed a centrifugal separator that can improve the marginal rotational speed of a rotating body and thus the efficiency of separation of solids And the composition of the centrifugal separator has been proposed and registered.

In this case, as the speed of the rotating body increases and the separation efficiency is improved, there is an advantage that the heavy solid and the supernatant can be effectively separated. However, since the separation efficiency is improved, And is discharged together with the supernatant.

In addition, when a supernatant or a solid substance including a substance having high recycling value such as diamond is contained, it is necessary to separate and extract these substances again from the supernatant or solid matter. However, when using a conventional centrifuge having good separation efficiency, There is a problem that it is difficult to efficiently separate a substance having a small volume or a relatively small specific gravity compared with other materials.

Particularly, since the strength of materials applied to processes such as a sapphire material that can secure transparency without being easily damaged by external force of glass applied to a display panel such as a smart phone or a smart watch has recently been increased, There has been an increasing number of cases in which a polishing slurry containing a diamond is applied to a sapphire glass and polished with a polishing pad to polish the sapphire glass.

During this polishing process, waste slurries containing small and relatively light solids such as copper powder, diamond powder and sapphire powder, which are generated during polishing in a liquid such as oil, are discharged. The copper powder and diamond powder And sapphire powder are efficiently separated and the diamond powder can be easily extracted.

That is, the waste slurry generated in the polishing process includes copper powder having a size of about 0.4 to 1 mm, diamond powder having a size of about 4 μm or more, and sapphire powder having a size of about 0.4 μm or less , The copper powder has a specific gravity of about 9.0, the diamond powder has a specific gravity of about 3.5, and the sapphire powder has a specific gravity of about 4.3 so that the waste slurry is fastened to the inner wall of the rotating body by centrifugal force The waste slurry is separated and discharged as a supernatant together with the liquid without being separated. When the waste slurry rotates too slowly, it is collected and discharged as a solid matter mass, which makes it difficult to appropriately recycle diamond or the like.

Korean Patent No. 10-1446588 Korean Patent No. 10-1152176 Korean Patent No. 10-0867762

In the present invention, in separating the industrial waste slurry into the supernatant liquid and the solid matter in the inside of the reversing body formed by vertically forming the conical upper rotating body and the cylindrical lower rotating body, the retarding blade provided in the delay- By increasing or decreasing the pitch between the delay blades to increase the path through which the industrial waste slurry undergoes a centrifugal force within the case to increase the weight of the diamond powder or sapphire powder or the like which can be generated during the polishing operation as well as heavy and bulky solids, It is another object of the present invention to provide a centrifugal separator capable of selectively separating a relatively light and bulky solid such as copper powder by using a specific gravity difference.

In order to solve the above problems, a centrifugal separator capable of selective separation using specific gravity difference,

A case which forms an outer frame and receives the industrial waste slurry from the outside and discharges the supernatant liquid and the solid matter separated by the centrifugal force generated by the rotating shaft rotating at high speed to the outside; The upper part of the case is formed so as to have a reduced inner diameter as it goes up to a height, and a lower inner diameter of the inner part is constant And the centrifugal force as it goes downward, so that the traveling path is not reduced; A rotating blade connected to the upper and lower ends of the reversed phase by a bearing assembly inside the reversed rotating body, and a delay blade for dividing the reversed rotating internal slurry into a plurality of spaces so as to form a rotating path, A delay screw conveyor provided with a screw; And a rotating body driving motor for providing power for rotating the rotating shaft by an external power source.

At this time,

A conical upper rotating body formed so that the diameter of the inner end face decreases toward the upper side according to the height; And a cylindrical lower rotating body located under the conical upper rotating body and having a constant inner diameter regardless of the height.

In addition, the delay screw conveyor may include:

A cylindrical housing rotatable about a rotational axis in a height direction; And a delay blade formed in a spiral shape on the outer circumferential surface of the cylindrical housing to divide the inner space of the entire inverted rotor into a plurality of spaces so as to form a path for rotating the industrial waste slurry.

At this time, it is preferable that at least one delay hole formed through the delay blade is formed downward.

The delay blades are formed such that the pitch between the delay blades becomes longer toward the upper portion of the cylindrical housing and the pitch between the delay blades becomes shorter toward the lower portion of the cylindrical housing.

Further, on the upper surface of the delay blade, there is further formed a floating solid separation step vertically protruding so as to block the lower region of the waste slurry.

Industrial waste slurry increases the path through which centrifugal force is applied to the inside of the case, thereby increasing the amount of solid and bulky solids as well as a relatively light and small volume solid such as diamond powder, sapphire powder or copper powder, Can be efficiently separated.

In addition, the present invention has an effect of efficiently separating a light solid that moves under centrifugal force in a floating state on a liquid because the specific gravity is smaller than that of the liquid forming the industrial waste slurry.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external front view of a centrifugal separator according to the present invention, which can be selectively separated using specific gravity difference; FIG.
2 is a sectional view taken along the line AA of Fig.
3 is a cross-sectional view showing that the pitch of the retardation blade gradually decreases from top to bottom according to the present invention.
4 is an enlarged cross-sectional view showing that a floating solid separation tuck according to the present invention is formed on one surface of a delay blade;

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an external front view of a centrifugal separator capable of selective separation using specific gravity difference according to the present invention, and FIG. 2 is a cross-sectional view taken along line A-A of FIG.

Referring to FIGS. 1 and 2, a centrifugal separator 10 capable of selectively separating by a specific gravity difference according to the present invention forms an outer frame, receives waste slurry for industrial use from the outside, and is generated by a rotating shaft rotating at high speed A casing 100 for discharging the supernatant liquid and the solids separated by the centrifugal force externally to the outside and a bearing assembly for rotatably rotating about the rotation axis within the casing, And the inner diameter of the inner section is kept constant regardless of the height of the inner diameter of the inner circumferential surface of the inner circumferential surface of the inner circumferential surface of the inner circumferential surface, Which is connected to the upper and lower ends of the entire reversed circuit by the combination, A delay screw conveyor 300 provided with a delay blade for dividing a space into a plurality of spaces so as to form a rotating path while receiving centrifugal force, a rotating screw conveyor 300 for rotating the rotating shaft by a power source supplied from the outside, And a driving motor 400.

The case 100 forms a frame of a centrifugal separator 10 which is supplied with an industrial waste slurry and centrifugally discharges the waste slurry from the outside. The case 100 includes a case 100 disclosed in a vertical centrifugal separator disclosed in Japanese Patent Application No. 10-1446588 As shown in FIG.

Accordingly, the case 100 includes a slurry supply pipe 110 provided at the center of the upper surface for supplying industrial waste slurry to be recycled from outside and guiding the waste slurry to the inside of the case, and a centrifugal separator And a solids discharge port 130 formed at a lower portion of the case and discharging centrifugal solids to the outside.

At this time, the centrifugal separator 10 capable of selectively separating by using the specific gravity difference according to the present invention is intended to be able to separate and extract expensive fine powder such as diamond contained in the industrial waste slurry generated in the polishing process and the like In addition, in the vertical centrifugal separator disclosed in the applicant's prior art No. 10-1446588, large and heavy solids are primarily used as a raw material for the centrifugal separation, The separated supernatant may then be fed into an industrial waste slurry to be recycled to provide secondary centrifugation.

As shown in FIG. 2, the reversed phase transformer 200 includes a conical upper rotating body 210 formed to have a reduced inner diameter as it goes up in height, and a conical upper rotating body 210 located below the conical upper rotating body, And a cylindrical lower rotating body 220 in which the diameter of the inner end face is kept constant regardless of the diameter of the inner end face.

As described above, since the inverted conic body 200 has a conical shape in which the inner cross-sectional diameter of the upper part decreases, the inner contour of the inverted conical body 200 becomes a cylindrical shape having a constant inner cross- Bar, and the rotating body provided in the conventional vertical centrifugal separator.

That is, in the rotating body provided in the conventional vertical centrifugal separator, the cylindrical portion is formed on the upper portion and the conical portion is formed on the lower portion, so that the diameter of the inner end surface of the lower portion falling down due to gravity can be reduced, It is possible to minimize the discharge of the slurry. However, by increasing the path through which the centrifugal force is received in the centrifugal separator 200 of the centrifugal separator according to the present invention, a solid such as fine powder, The diameter of the inner end face is decreased as the diameter of the inner end face is increased and the diameter of the inner end face is not decreased so as to provide a sufficient path for separating the solid such as fine powder under the centrifugal force. Respectively.

Since the rotating body provided in the conventional vertical centrifugal separator is intended to prevent the liquid not separated from the solid matter from being discharged together with the solid matter, the discharge efficiency of the solid matter can be reduced. On the contrary, The centrifugal separator according to the present invention is used for preventing the solid such as fine powder not separated from the liquid from being discharged together with the liquid. Therefore, in order to reduce the discharge efficiency of the liquid, Structure that is made up of the entire circuit.

The inverted conical body 200 including the conical upper rotating body 210 and the cylindrical lower rotating body 220 is rotatably mounted on the inner upper end of the case 100 so as to be rotatable about a rotational axis in the vertical direction inside the case 100 And is coupled to the case 100 through the bearing assembly 230 at the lower end. Such a bearing assembly 230 is the same as the conventional vertical centrifugal separator in which the rotating body is coupled to the case, and a detailed description thereof will be omitted.

Also, the conical upper rotating body 210 includes at least one liquid discharge hole 212 formed to penetrate the sidewall so as to connect the inside and the outside of the reverse rotating body, The liquid component of the industrial waste slurry is discharged to the outside of the case again via the inner space of the case 100 in which the liquid discharge port 120 is formed, as in the case of the conventional vertical centrifugal separator.

The cylindrical lower rotating body 220 also has at least one or more solids discharge holes 222 formed to pass through the side walls so as to connect the inside and the outside of the reverse side of the rotating body 220, The solid component of the industrial waste slurry is discharged to the outside of the case after passing through the inner space of the case 100 in which the solid matter discharge port 130 is formed as in the case of the conventional vertical centrifugal separator.

The delay screw conveyor 300 includes a cylindrical housing 310 rotatable about a rotational axis in a height direction and a spiral protrusion formed on an outer circumferential surface of the cylindrical housing, And a delay blade 320 which divides into a plurality of spaces to form a path.

The delay screw conveyor 300 is coupled to the entire reverse circuit through the bearing assembly at the inner upper end and the lower end of the reverse rotating body so that the delayed screw conveyor 300 can rotate about the vertical rotating shaft in the reverse rotating body 200. The bearing assembly used to couple the delay screw conveyor to the entire reversed phase is of the same construction as the bearing assembly used to couple the entire reverse phase to the case, except that the air block is not used. That is, the bearing assembly that supports the delay screw conveyor in the inside of the reverse rotating body is fixed directly to the reverse rotating body without passing through the air block.

At this time, the cylindrical housing 310 has a hollow cylindrical shape. The inner space of the cylindrical housing 310 is separated by the partition plate 312. The inner space of the upper part thus separated is connected to the slurry supply pipe 110, Thereby forming a supply chamber 314 extending from the supply chamber 314.

The supply chamber 314 accommodates the industrial waste slurry supplied through the slurry supply pipe 110 and discharges the waste slurry into the inverted rotor body 200 through the slurry discharge port 316 formed through the side wall of the cylindrical housing 310 . At this time, the slurry discharge port 316 is preferably formed on the sidewall of the cylindrical housing corresponding to the boundary between the conical upper rotating body and the cylindrical lower rotating body.

2 and 3, the delay blade 320 may have at least one delay hole 322 formed in a downward direction. This delay hole 322 allows the industrial waste slurry to be centrifuged to move vertically between the inner spaces of the reversed phase body 200 partitioned by the retarding blade.

That is, the waste slurry rotating when it rotates through the space defined by the delay blade 320 is partly dropped downward by the gravity in the place where the delay hole 322 is formed, so that the liquid contained in the waste slurry is discharged It is necessary to ascend again while rotating along the delay blade.

Accordingly, not only the heavy solid but also the solid such as the relatively light and small powder can be centrifugally moved while being repeatedly moved in the space partitioned by the retarding blade 320, so that it can be more reliably separated from the liquid. The solid (copper powder, diamond powder, sapphire powder, etc.) separated by the centrifugal force received while moving in the space defined by the retarding blade 320 is collected in the centrifugal part 200 as in the conventional vertical centrifugal separator, Of course.

2, the delay blades 320 may be installed such that the pitch P between the delay blades is constant and the intervals thereof are uniform, that is, Of course, as shown in FIG. 3, the pitch P between the delay blades becomes longer toward the upper portion of the cylindrical housing, and the pitch P between the delay blades becomes shorter toward the lower portion of the cylindrical housing have.

Since the interval P between the delay blades 320 installed in the cylindrical housing, that is, the distance between the upper and lower blades of the delay blade, decreases, the path through which the industrial waste slurry must move in order to move the cylindrical housing vertically The centrifugal force is received for a longer time, so that the solids such as powder having a relatively small volume and relatively light weight can be more faithfully separated.

3, the pitch between the delay blades increases to about two times higher than the pitch between the delay blades at the upper portion of the cylindrical housing, and the pitch between the delay blades at the lower portion of the cylindrical housing increases To about one half. However, it goes without saying that the pitches between the delay blades can be variously formed without being limited to such a size.

As shown in FIG. 4, on the upper surface of the retarding blade 320, a floating solid separating jaw for blocking the lower region of the waste slurry so as to separate the upper region of the waste slurry moving through the space between the delay blades, (324) is further formed.

In general, centrifuges are used to separate solids from liquids by difference in specific gravity. Solids with a large specific gravity sink downward, and liquids with a small specific gravity float on the top. However, even in the case of solids, There are floating solids that float and move, and these solids were not easy to separate from the liquid.

Accordingly, by preventing the movement of the liquid component constituting the waste slurry on the upper surface of the retarding blade 320, the floating solids floating on the liquid are first forwardly separated from the liquid, and the liquid dropping the floating solid can be pushed back So as to vertically protrude upward from the upper surface of the retarding blade.

By further forming the floating solid separation step vertically protruding on one surface of the delay blade, it is possible to improve the separation efficiency of not only the specific gravity material such as liquid but also the specific gravity material such as protein.

The rotating-body driving motor 400 is a device for generating a rotating force by receiving electricity from the outside, and transmits rotational force to the rotating shaft of the non-rotating body 200 through indirect power transmitting means such as a belt, a rope or a chain . A part of the rotational force transmitted to the rotating shaft of the reverse rotating body 200 in the rotating body driving motor 400 is transmitted to the rotating shaft of the delay screw conveyor 300 at a reduced rotating speed through the speed reducer 500. Since the structure and operation principle of the speed reducer 500 are obvious to those skilled in the art, a detailed description thereof will be omitted.

In addition, the centrifugal separator capable of selectively separating by using the specific gravity difference according to the present invention may further include an electromagnetic brake 600 mounted on the case and acting on the lower end of the rotating shaft of the reverse rotating body for braking.

At this time, the electromagnetic brake 600 is supplied with electricity from the outside to raise the brake block and contact the brake drum fixed on the rotary shaft of the reverse rotating body, so that the rotating shaft of the reverse rotating body can be braked by friction. The construction and operation principle of the electromagnetic brake are obvious to those skilled in the art, and thus a detailed description thereof will be omitted.

When a solid having a relatively small specific gravity such as copper powder, diamond powder and sapphire powder is centrifuged using the centrifugal separator 10 capable of selectively separating by using the specific gravity difference according to the present invention, The waste slurry for industrial use is supplied to the inside of the rotating body 200 by rotation of the rotating body driving motor 400 and the rotating body 100 through the speed reducer 500 The delayed blade 320 receives the centrifugal force while being rotated by the delayed screw conveyor 300, which is provided with a reduced rotational force, and moves on the delayed blade 320 in a state of being closely contacted to the inner circumferential surface of the reverse rotating body.

At this time, the liquid and solid (copper powder, diamond powder, sapphire powder, etc.) mixed in the industrial waste slurry have a laminated structure on the inner circumferential surface of the entire reversed phase due to the difference in specific gravity. That is, a solid layer having a larger specific gravity than the liquid is formed on the inner circumferential surface of the reversed phase, and a liquid layer is formed closer to the rotation axis of the rotating body than the solid layer.

The solid material stacked on the inner circumferential surface of the reversed phase conveyor is guided downward by the retarding blade provided in the delay screw conveyor by the difference in rotational speed between the reversed phase body 200 and the delayed screw conveyor 300, And discharged to the outside through the solids discharge hole formed at the lower side of the whole side wall and then discharged to the outside through the solids discharge port installed in the case. If the rotating screw conveyor rotates at a rotational speed lower than the total rotational speed of the rotary screw conveyor, for example, if the rotary screw conveyor rotates at 4000 RPM, the delay screw conveyor rotates at 3990 RPM, So that the solid matter accumulated on the inner side of the reverse side can be lowered down.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

10: Centrifuge
100: Case 110 slurry feed pipe
120: liquid outlet 130: solid outlet
200: reversed phase whole 210: conical upper rotating body
212: liquid discharge hole 220: cylindrical lower rotating body
222: solids discharge hole 230: bearing assembly
300: delayed screw conveyor 310: cylindrical housing
312: partition plate 314: supply chamber
316: Slurry discharge port 320: Delay blade
322: retarding hole 324: floating solid separation chin
400: Rotor drive motor 500: Reduction gear
600: Electronic brake

Claims

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A centrifugal separator for separating and separating supernatant and solids by centrifugal force after being supplied with industrial waste slurry,
A case which forms an outer frame and receives the industrial waste slurry from the outside and discharges the supernatant liquid and the solid matter separated by the centrifugal force generated by the rotating shaft rotating at high speed to the outside;
The upper part of the case is formed so as to have a reduced inner diameter as it goes up to a height, and a lower inner diameter of the inner part is constant And the centrifugal force as it goes downward, so that the traveling path is not reduced;
A rotating blade connected to the upper and lower ends of the reversed phase by a bearing assembly inside the reversed rotating body, and a delay blade for dividing the reversed rotating internal slurry into a plurality of spaces so as to form a rotating path, A delay screw conveyor provided with a screw; And
And a rotor drive motor for providing power for rotating the rotary shaft by an external power source,
The reversed-
A conical upper rotating body formed so that the diameter of the inner end face decreases toward the upper side according to the height; And
And a cylindrical lower rotating body located below the conical upper rotating body and having a constant inner diameter regardless of the height,
Wherein the delay screw conveyor comprises:
A cylindrical housing rotatable about a rotational axis in a height direction; And
And a delay blade formed in a spiral shape on an outer circumferential surface of the cylindrical housing to divide the inner space of the entire inverted portion into a plurality of spaces so as to form a path for rotating the industrial waste slurry,
Wherein the delay blade has at least one delay hole formed to pass through downwardly.

5. The method of claim 4,
Wherein the delay blades are formed such that a pitch between the delay blades becomes longer toward the upper portion of the cylindrical housing and a pitch between the delay blades becomes shorter toward the lower portion of the cylindrical housing toward the upper portion of the cylindrical housing. Centrifugal separator.

6. The method of claim 5,
And a floating solid separating jaw vertically protruding to block the lower region of the waste slurry is further formed on the upper surface of the delaying blade.