CN105880042A - Spiral scraping type vertical centrifugal machine - Google Patents
Spiral scraping type vertical centrifugal machine Download PDFInfo
- Publication number
- CN105880042A CN105880042A CN201610305483.5A CN201610305483A CN105880042A CN 105880042 A CN105880042 A CN 105880042A CN 201610305483 A CN201610305483 A CN 201610305483A CN 105880042 A CN105880042 A CN 105880042A
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- Prior art keywords
- rotating cylinder
- rotating
- rotating disk
- type vertical
- centrifugal machine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B11/00—Feeding, charging, or discharging bowls
- B04B11/08—Skimmers or scrapers for discharging ; Regulating thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B11/00—Feeding, charging, or discharging bowls
Abstract
The invention discloses a spiral scraping type vertical centrifugal machine. A rotary drum is arranged in a shell. A spiral mechanism is arranged in the rotary drum. A rotary disc of the spiral mechanism is internally provided with a storage cavity. During centrifuging, materials to be separated are distributed towards the interior of the rotary drum through the rotary disc. A liquid phase of the materials to be separated is thrown out through meshes through the high-speed rotation of the rotary drum. A fixed phase of the materials to be separated is attached to the inner wall of the rotary drum, meanwhile, the spiral mechanism rotates to scrap the solid-phase material on the inner wall of the rotary drum away, and fast and efficient solid-liquid separation is achieved. By means of the above spiral scraping type vertical centrifugal machine optimally designed, the structural design is reasonable, on one hand, in the solid-liquid separation process, a spiral blade can make the solid phase scraped from the rotary drum; on the other hand, the materials to be separated enter the rotary drum through the cavity in the rotary disc so that the materials can enter the rotary drum at the speed in the direction the same as the steering direction of the rotary drum; and therefore the solid-liquid separation effect in the rotary drum is improved.
Description
Technical field
The present invention relates to Centrifuge Techniques field, particularly relate to a kind of spiral scraper type vertical centrifugal machine.
Background technology
Centrifuge is to utilize rotating cylinder to rotate the centrifugal inertial force that produces to realize suspension, emulsion and other is non-
All machines separating or concentrating of phase materials.Scraper discharging formula centrifuge is mainly by high-revolving rotating cylinder, transmission
The parts such as device and discharge device for scraper form, operation principle is: when need separate suspension enter from
After scheming rotating cylinder, the rotating cylinder of high speed rotating produces powerful centrifugal force and solid phase particles is deposited to rotating cylinder inwall,
And be trapped in rotating cylinder by filter screen, liquid phase is leached by filter screen, and the solid phase being trapped in rotating cylinder inwall is scraped by scraper
Go out and discharge rotating cylinder.When using scraper scraper, in the case of rotating cylinder rotates, the scraper scraper being fixedly installed
Poor effect, and the material scraped can splash, and causes the loss of material.
Summary of the invention
For solving technical problem present in background technology, the present invention proposes a kind of spiral scraper type vertical centrifugal
Machine.
A kind of spiral scraper type vertical centrifugal machine that the present invention proposes, including: base, housing, rotating cylinder, spiral shell
Rotation mechanism, feed pipe, the first motor, the second motor；
Housing is arranged on base, and enclosure interior has accommodating chamber, and described accommodating chamber top is provided with opening,
It is provided with liquid outlet bottom described accommodating chamber；
Rotating cylinder is positioned at described accommodating chamber and is vertically arranged, and is provided with the split cavity being vertically arranged inside rotating cylinder,
Described split cavity open top bottom lock, cylinder sidewall has mesh structure；
Screw mechanism includes rotating disk, support, helical blade, and rotating disk is horizontally disposed with and is coaxially disposed with rotating cylinder,
Rotating disk is arranged at shell nozzle by bearing, and support is positioned at below rotating disk and extends to rotating cylinder bottom rotating disk
In, helical blade is coaxially disposed with rotating disk and rack-mount, helical blade be positioned at rotating cylinder and its away from
Straight line one end, rotating disk axis place and rotating cylinder inwall matched in clearance, be provided with cavity, described cavity top inside rotating disk
Portion is provided with charging aperture and bottom is provided with the first discharging opening, and feed pipe one end connects with described charging aperture；
First motor and rotating cylinder drive connection are used for driving rotating cylinder to rotate around its rotating shaft, the second motor and spiral
Mechanism is connected to drive screw mechanism to rotate around rotating cylinder rotating shaft.
Preferably, being provided with multiple first discharging opening bottom rotating disk, multiple discharging openings divide around rotating disk circumference
Cloth.
Preferably, support includes multiple standpipe, and multiple standpipes are around rotating disk axis circle distribution and each standpipe
Top connects with first discharging opening, and standpipe sidewall is provided with the second discharging opening.
Preferably, the second discharging opening is positioned at standpipe away from rotating disk axis side.
Preferably, each standpipe is provided with multiple second discharging opening, and multiple second discharging openings axially depend on along standpipe
Secondary setting.
Preferably, screw mechanism and rotating cylinder turn to identical and screw mechanism rotating speed to be less than rotating cylinder rotating speed.
Preferably, rotating disk is removably mounted on housing.
In the present invention, the spiral scraper type vertical centrifugal machine proposed, rotating cylinder is arranged in housing, in rotating cylinder
Being provided with screw mechanism, be provided with storing cavity in the rotating disk of screw mechanism, time centrifugal, material to be separated is by turning
Dish is cloth in rotating cylinder, and by the high speed rotating of rotating cylinder, the liquid phase of material to be separated is thrown away by mesh, treats
The solid phase of separation of material is attached to rotating cylinder inwall, and screw mechanism rotates and scraped by the solid-phase material of rotating cylinder inwall simultaneously
Remove, it is achieved rapidly and efficiently solid-liquid separation.The spiral scraper type vertical centrifugal machine designed by above-mentioned optimization, knot
Structure is reasonable in design, on the one hand, during solid-liquid separation, and solid phase can be struck off from rotating cylinder by helical blade,
On the other hand, material to be separated is entered in rotating cylinder by the cavity in rotating disk so that material is to turn to rotating cylinder
The speed of equidirectional enters in rotating cylinder, thus solid-liquid separation effect in improving rotating cylinder.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of spiral scraper type vertical centrifugal machine that the present invention proposes.
Detailed description of the invention
As it is shown in figure 1, the structural representation of a kind of spiral scraper type vertical centrifugal machine that Fig. 1 is the present invention to be proposed
Figure.
Reference Fig. 1, a kind of spiral scraper type vertical centrifugal machine that the present invention proposes, including: base 1, housing
2, rotating cylinder 3, screw mechanism, feed pipe the 5, first motor, the second motor；
Housing 2 is arranged on base 1, and housing 2 is internal has accommodating chamber, and described accommodating chamber top sets
There is opening, bottom described accommodating chamber, be provided with liquid outlet；
Rotating cylinder 3 is positioned at described accommodating chamber and is vertically arranged, and rotating cylinder 3 is internal is provided with the separation being vertically arranged
Chamber, described split cavity open top bottom lock, rotating cylinder 3 sidewall has mesh structure；
Screw mechanism includes rotating disk 41, support, helical blade 42, rotating disk 41 be horizontally disposed with and with rotating cylinder 3
Being coaxially disposed, rotating disk 41 is arranged on housing 2 opening part by bearing, is provided with multiple first bottom rotating disk 41
Discharging opening, multiple discharging openings are distributed around rotating disk 41 circumference, and support is positioned at below rotating disk 41 and from turning
Extending in rotating cylinder 3 bottom dish 41, support includes multiple standpipe 43, and multiple standpipes 43 are around rotating disk 41 axle
Line circle distribution and each standpipe 43 top connect with first discharging opening, and standpipe 43 sidewall is provided with second
Discharging opening, helical blade 42 is coaxially disposed and rack-mount with rotating disk 41, and helical blade 42 is positioned at and turns
Cylinder 3 is interior and it is away from straight line one end, rotating disk 41 axis place and rotating cylinder 3 inwall matched in clearance, in rotating disk 41
Portion is provided with cavity, and described cavity top is provided with charging aperture and bottom is provided with the first discharging opening, feed pipe 5 one end
Connect with described charging aperture；
First motor and rotating cylinder 3 drive connection are used for driving rotating cylinder 3 to rotate around its rotating shaft, the second motor with
Screw mechanism is connected to drive screw mechanism to rotate around rotating cylinder 3 rotating shaft.
During the specific works of the spiral scraper type vertical centrifugal machine of the present embodiment, material to be separated is via entering
Material pipe enters in the storing cavity in rotating disk, and the first motor drives rotating cylinder to rotate, and the second motor drives screw machine
Structure rotates, and screw mechanism and rotating cylinder 3 turn to identical and screw mechanism rotating speed to be less than rotating cylinder rotating speed, during work,
Rotating disk is by the second discharging opening cloth in rotating cylinder on standpipe, by the high speed rotating of rotating cylinder, material to be separated
The liquid phase of material is thrown away in rotating cylinder by mesh, finally discharges via the liquid outlet of housing, material to be separated
Solid phase is attached on rotating cylinder inwall；When separating, helical blade rotates and is struck off by the solid-phase material of rotating cylinder inwall
Simultaneously the most upwardly, thus realize rapidly and efficiently solid-liquid separation.
In the present embodiment, the spiral scraper type vertical centrifugal machine proposed, rotating cylinder is arranged in housing, turns
Being provided with screw mechanism in Tong, be provided with storing cavity in the rotating disk of screw mechanism, time centrifugal, material to be separated leads to
Crossing rotating disk cloth in rotating cylinder, by the high speed rotating of rotating cylinder, the liquid phase of material to be separated is thrown away by mesh,
The solid phase of material to be separated is attached to rotating cylinder inwall, and screw mechanism rotates the solid-phase material of rotating cylinder inwall simultaneously
Strike off, it is achieved rapidly and efficiently solid-liquid separation.The spiral scraper type vertical centrifugal machine designed by above-mentioned optimization,
Reasonable in design, on the one hand, during solid-liquid separation, solid phase can be scraped from rotating cylinder by helical blade
Removing, on the other hand, material to be separated enters in rotating cylinder by the cavity in rotating disk so that material with rotating cylinder
The speed being angled in the same direction enters in rotating cylinder, thus solid-liquid separation effect in improving rotating cylinder.
In the specific design of standpipe, each standpipe 43 is provided with multiple second discharging opening, the second discharging opening position
Axially set gradually along standpipe 43 away from rotating disk 41 axis side, multiple second discharging openings in standpipe 43；Protect
Demonstrate,prove material to be separated to have when the second discharging opening is discharged and turn to the identical speed in identical direction with rotating cylinder, from
And enter rotating cylinder time will not to rotating cylinder in flow direction of material cause disturbance, affect separating effect.
In a specific embodiment, rotating disk 41 is removably mounted on housing 2, after separation terminates, it is simple to
Helical blade takes out in housing, it is simple to the collection of the solid-phase material on helical blade.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention not office
Being limited to this, any those familiar with the art is in the technical scope that the invention discloses, according to this
The technical scheme of invention and inventive concept thereof in addition equivalent or change, all should contain the protection in the present invention
Within the scope of.
Claims (7)
1. a spiral scraper type vertical centrifugal machine, it is characterised in that including: base (1), housing (2),
Rotating cylinder (3), screw mechanism, feed pipe (5), the first motor, the second motor；
Housing (2) is arranged on base (1), and housing (2) is internal has accommodating chamber, described receiving chamber
Ceiling portion is provided with opening, is provided with liquid outlet bottom described accommodating chamber；
Rotating cylinder (3) is positioned at described accommodating chamber and is vertically arranged, and internal being provided with of rotating cylinder (3) is vertically arranged
Split cavity, described split cavity open top bottom lock, rotating cylinder (3) sidewall has mesh structure；
Screw mechanism includes rotating disk (41), support, helical blade (42), rotating disk (41) be horizontally disposed with and
Being coaxially disposed with rotating cylinder (3), rotating disk (41) is arranged on housing (2) opening part, support position by bearing
In rotating disk (41) lower section and from rotating disk (41) bottom extend to rotating cylinder (3) in, helical blade (42) and
Rotating disk (41) is coaxially disposed and rack-mount, and helical blade (42) is positioned at rotating cylinder (3) and it is remote
From straight line one end, rotating disk (41) axis place and rotating cylinder (3) inwall matched in clearance, rotating disk (41) is internal to be set
Have cavity, described cavity top to be provided with charging aperture and bottom be provided with the first discharging opening, feed pipe (5) one end with
Described charging aperture connects；
First motor and rotating cylinder (3) drive connection are used for driving rotating cylinder (3) to rotate around its rotating shaft, and second
Motor and screw mechanism are connected to drive screw mechanism to rotate around rotating cylinder (3) rotating shaft.
Spiral scraper type vertical centrifugal machine the most according to claim 1, it is characterised in that rotating disk (41)
Bottom is provided with multiple first discharging opening, and multiple discharging openings are distributed around rotating disk (41) circumference.
Spiral scraper type vertical centrifugal machine the most according to claim 2, it is characterised in that support includes
Multiple standpipes (43), multiple standpipes (43) are around the distribution of rotating disk (41) circumference and each standpipe (43)
Top connects with first discharging opening, and standpipe (43) sidewall is provided with the second discharging opening.
Spiral scraper type vertical centrifugal machine the most according to claim 3, it is characterised in that the second discharging
Mouth is positioned at standpipe (43) away from rotating disk (41) axis side.
Spiral scraper type vertical centrifugal machine the most according to claim 1, it is characterised in that each standpipe
(43) being provided with multiple second discharging opening, multiple second discharging openings axially set gradually along standpipe (43).
Spiral scraper type vertical centrifugal machine the most according to claim 1, it is characterised in that screw mechanism
Identical and screw mechanism rotating speed is turned to be less than rotating cylinder (3) rotating speed with rotating cylinder (3).
Spiral scraper type vertical centrifugal machine the most according to claim 1, it is characterised in that rotating disk (41)
It is removably mounted on housing (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610305483.5A CN105880042B (en) | 2016-05-09 | 2016-05-09 | A kind of spiral scraper type vertical centrifugal machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610305483.5A CN105880042B (en) | 2016-05-09 | 2016-05-09 | A kind of spiral scraper type vertical centrifugal machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105880042A true CN105880042A (en) | 2016-08-24 |
| CN105880042B CN105880042B (en) | 2019-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610305483.5A Active CN105880042B (en) | 2016-05-09 | 2016-05-09 | A kind of spiral scraper type vertical centrifugal machine |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106862068A (en) * | 2017-04-24 | 2017-06-20 | 贵州金石车载式流动打砂机制造有限责任公司 | A kind of circulating quartz sand dedusting screening plant |
| CN108862993A (en) * | 2018-07-09 | 2018-11-23 | 温州海德能环保设备科技有限公司 | A kind of filtering and concentrating equipment of sewage purification |
| CN108997038A (en) * | 2018-09-03 | 2018-12-14 | 平顶山市绿禾农业科技开发有限公司 | Experimental provision is used in a kind of research and development of selenium-enriched organic fertilizer |
| CN109289298A (en) * | 2018-08-17 | 2019-02-01 | 江苏泰利达新材料股份有限公司 | Utilize the method for the waste liquid production hydroxyacetic acid of CMC |
| CN110801941A (en) * | 2019-11-11 | 2020-02-18 | 衡阳凯美科化工有限公司 | Chemical raw material screening centrifuge |
| CN113058754A (en) * | 2021-03-30 | 2021-07-02 | 樊振宇 | Environment-friendly vertical rotating cage spiral solid-liquid separation equipment |
| CN113695093A (en) * | 2021-08-30 | 2021-11-26 | 绍兴沃莱食品机械有限公司 | Continuous centrifugal spin-drying device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB295916A (en) * | 1928-03-20 | 1928-08-23 | Laughlin Filter Corp | Improvements in or relating to centrifugal machines |
| SU1692656A1 (en) * | 1989-04-03 | 1991-11-23 | Всесоюзный научно-исследовательский и проектно-изыскательский институт по проблемам добычи, транспорта и переработки минерального сырья в промышленности строительных материалов | Filtering centrifuge |
| CN2510167Y (en) * | 2001-03-30 | 2002-09-11 | 项秀武 | Continuous centrifugal dewaterer |
| CN1398677A (en) * | 2002-04-27 | 2003-02-26 | 梁学增 | Centrifugal filter |
| CN202845180U (en) * | 2012-11-05 | 2013-04-03 | 陈志才 | Vertical type spiral centrifugal device |
| CN203245049U (en) * | 2013-04-09 | 2013-10-23 | 河北科技大学 | Suspended conical screw type centrifugal machine |
| CN203750706U (en) * | 2014-04-16 | 2014-08-06 | 河北科技大学 | Quick separating dehydrator |
-
2016
- 2016-05-09 CN CN201610305483.5A patent/CN105880042B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB295916A (en) * | 1928-03-20 | 1928-08-23 | Laughlin Filter Corp | Improvements in or relating to centrifugal machines |
| SU1692656A1 (en) * | 1989-04-03 | 1991-11-23 | Всесоюзный научно-исследовательский и проектно-изыскательский институт по проблемам добычи, транспорта и переработки минерального сырья в промышленности строительных материалов | Filtering centrifuge |
| CN2510167Y (en) * | 2001-03-30 | 2002-09-11 | 项秀武 | Continuous centrifugal dewaterer |
| CN1398677A (en) * | 2002-04-27 | 2003-02-26 | 梁学增 | Centrifugal filter |
| CN202845180U (en) * | 2012-11-05 | 2013-04-03 | 陈志才 | Vertical type spiral centrifugal device |
| CN203245049U (en) * | 2013-04-09 | 2013-10-23 | 河北科技大学 | Suspended conical screw type centrifugal machine |
| CN203750706U (en) * | 2014-04-16 | 2014-08-06 | 河北科技大学 | Quick separating dehydrator |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106862068A (en) * | 2017-04-24 | 2017-06-20 | 贵州金石车载式流动打砂机制造有限责任公司 | A kind of circulating quartz sand dedusting screening plant |
| CN108862993A (en) * | 2018-07-09 | 2018-11-23 | 温州海德能环保设备科技有限公司 | A kind of filtering and concentrating equipment of sewage purification |
| CN108862993B (en) * | 2018-07-09 | 2020-12-04 | 温州海德能环保设备科技有限公司 | Filtration concentrator that sewage purification used |
| CN109289298A (en) * | 2018-08-17 | 2019-02-01 | 江苏泰利达新材料股份有限公司 | Utilize the method for the waste liquid production hydroxyacetic acid of CMC |
| CN108997038A (en) * | 2018-09-03 | 2018-12-14 | 平顶山市绿禾农业科技开发有限公司 | Experimental provision is used in a kind of research and development of selenium-enriched organic fertilizer |
| CN110801941A (en) * | 2019-11-11 | 2020-02-18 | 衡阳凯美科化工有限公司 | Chemical raw material screening centrifuge |
| CN113058754A (en) * | 2021-03-30 | 2021-07-02 | 樊振宇 | Environment-friendly vertical rotating cage spiral solid-liquid separation equipment |
| CN113695093A (en) * | 2021-08-30 | 2021-11-26 | 绍兴沃莱食品机械有限公司 | Continuous centrifugal spin-drying device |
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|---|---|
| CN105880042B (en) | 2019-02-01 |
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Effective date of registration: 20200117 Address after: 221000 Qianlou Village, Huangji Town, Tongshan District, Xuzhou City, Jiangsu Province, Team 121 Patentee after: Zhuo Houqiao Address before: No. C3-1 258 No. 233000 Anhui province Bengbu Huai District XTEP Avenue Patentee before: BENGBU XINGLI CENTRIFUGE MANUFACTURE CO., LTD. |
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Address after: 311800 unit 2, building 3, Anping community, Jiyang street, Zhuji City, Shaoxing City, Zhejiang Province Patentee after: Zhuo Houqiao Address before: 221000 Qianlou Village, Huangji Town, Tongshan District, Xuzhou City, Jiangsu Province, Team 121 Patentee before: Zhuo Houqiao |
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Effective date of registration: 20201215 Address after: No.79 shuangxiang Road, new materials Industrial Park, Nanjing Chemical Industrial Park, Liuhe District, Nanjing City, Jiangsu Province Patentee after: NANJING ZHENXING NEW ENERGY DEVELOPMENT Co.,Ltd. Address before: 311800 unit 2, building 3, Anping community, Jiyang street, Zhuji City, Shaoxing City, Zhejiang Province Patentee before: Zhuo Houqiao |