GB2099334A - Drive for screw centrifuge - Google Patents
Drive for screw centrifuge Download PDFInfo
- Publication number
- GB2099334A GB2099334A GB8116542A GB8116542A GB2099334A GB 2099334 A GB2099334 A GB 2099334A GB 8116542 A GB8116542 A GB 8116542A GB 8116542 A GB8116542 A GB 8116542A GB 2099334 A GB2099334 A GB 2099334A
- Authority
- GB
- United Kingdom
- Prior art keywords
- planetary gear
- motor
- centrifuge
- shaft
- driven
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
- B04B1/2016—Driving control or mechanisms; Arrangement of transmission gearing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
- B04B1/2016—Driving control or mechanisms; Arrangement of transmission gearing
- B04B2001/2025—Driving control or mechanisms; Arrangement of transmission gearing with drive comprising a planetary gear
Landscapes
- Centrifugal Separators (AREA)
Abstract
A continuously operating screw centrifuge for separating solids containing liquids with a rotatably drivable centrifuge drum containing a screw conveyor (19) rotating with a differential speed compared with the drum shell (5) has a first planetary gear (1) driven by means of a main drive motor (2) for driving the drum shell and the screw conveyor. A second planetary gear (6) is associated with the first planetary gear (1) and gear (6) with its case (6') is rotatably mounted on the motor shaft (7) of the main drive motor. The driven shaft (8) of the second planetary gear is fixed to the motor shaft of the main drive motor. The drive shaft (13) of the second planetary gear is driven by a two-speed motor (14) connected to a measuring and control unit (15). Thus, an automatic differential speed control between the centrifuge shell and the screw conveyor is obtained, as a function of the torque loading. <IMAGE>
Description
SPECIFICATION
Continuously operating screw centrifuge
The invention relates to a continuously operating screw centrifuge with a rotatably drivable centrifuge drum comprising a drum shell and a screw conveyor rotating in the drum with a differential speed compared with the drum shell, drum shell and screw conveyor being driven by means of a motorvia a planetary gear, whilst a second planetary gear is associated with the latter and both planetary gears can be driven by means of a main drive motor and interchangeable V-beit pulleys and the drive shaft of the second planetary gear is driven by a motor connected to a measuring and control unit.
A screw centrifuge having such a construction is known from DOS 28 11 887. In addition to the necessary adjustability of the differential speed between the centrifuge drum shell and the screw conveyor it is possible to indicate the torque loading with or without product supply control, as well as an automatic torque-dependent differential speed control, but the construction of the drive is complicated and costly.
The problem of the invention is to so develop the object of the prior art that the drive is constructed in space and cost-saving manner, whilst at the same time simplifying installation.
According to the invention this problem is solved in that the secondary planetary gear with its case is rotatably mounted on the motor shaft of the main drive motor and the driven shaft of the second planetary gear is fixed to the motor shaft of the main drive motor.
Compared with the known screw centrifuge the arrangement according to the invention leads to a reduction of the revolving masses on the screw centrifuge and a lower speed of the mounting of the second planetary gear, together with a simplified, space and cost-saving construction, thereby facilitating the installation of the gear.
According to a special embodiment the motor-side
V-belt pulley for driving the centrifuge shell can be connected to the V-belt pulley for driving the screw conveyor which is fixed to the second planetary gear. In the case of a fixed connection of these two
V-belt pulleys arranged on the main drive motor shaft it is possible to control to a limited extent the drum speed instead of the differential speed between the centrifuge shell and the screw conveyor.
In addition, when the main drive motor is stationary it is possible to drive the centrifuge drum at a lower speed with the motor connected to a measuring and control unit, which is particularly advantageous when washing out the screw centrifuge.
Two embodiments of the invention are described hereinafter relative to the drawings, wherein show:
Figure 1 a longitudinal section through a screw centrifuge in which the second planetary gear case is positioned directly on the main drive motor shaft.
Figure 2 a longitudinal section through a screw centrifuge like Figure 1, but the V-belt pulley for driving the centrifuge shell is directly fixed to the
V-belt pulley of the screw drive.
In Figure 1, is a planetary gear, e.g. a cyclic gear which, via interchangable V-belt pulleys 3 and 4 and main drive motor 2 drive the rotatably mounted centrifuge shell 5 at a fixed speed. According to the invention a second planetary gear 6 is provided, whose gear case 6' is rotatably mounted on the motor shaft 7 of main drive motor 2 and whose driven shaft 8 is fixed to the motor shaft of the main drive motor. The second planetary gear drives the screw conveyor 9 via shaft 10 by means of a speed which is fixed with respect to the centrifuge shell as a function of the transmission ratios of the interchangeable V-belt pulleys 11, 12 and planetary gears 1,6.
The drive shaft 13 of the second planetary gear 6 is, for example, driven by a two-speed motor 14 with a fixed speed. The two-speed motor is connected to a measuring and control unit 15 permitting a speed change of the motor and/or a change to the product supply intake 16.
During operation the drive functions as follows. In the represented embodiment screw 9 rotates, for example, with a higher speed than the centrifuge shell 5.
The solid material obtained is fed in at the product intake 16 and in per se known manner is separated in the centrifuge drum, the solids being discharged at outlet 17 and the clear phase at outlet 18 of the centrifuge. For the conveying of the solids in the centrifuge drum by means of the screw conveyor different torques are required as a function of the particular use and the operating conditions. Part of the torque occurring between screw conveyor and centrifuge drum is transferred by drive shaft 13 of the second planetary gear 6 to motor 14. By means of a corresponding current consumption of the motor this torque is indicated on measuring unit 15 and is dependent on the product supply quantity and/orthe solid concentration obtained. When the product supply increases and/or the solids concentration increases the torque rises and consequently so does the motor current consumption.On exceeding a fixed torque and consequently the current consumption a contact ammeter automatically brings about a polarity reversal of the motor and consequently a torque reduction thereof and also of drive shaft 13. The latter in turn undergoes a variation in the transmission ratio between the output shaft and the case of the second planetary gear and consequently leads to an increase in the screw conveyor speed and also the differential speed. As a result the larger solids quantity obtained is discharged more rapidly, so that the torque is reduced. If the current consumption drops decreasing torque a further polarity reversal restores the basic speed of motor 14 and consequently the basic differential speed between screw conveyor and centrifuged drum. If the current consumption exceeds a set maximum limit value further measures can be taken, e.g. a throttling of the product supply 16 or switching off the main drive motor 2 by means of the measuring and control unit 15.
If the two-speed motor 14 is replaced by a variable-speed motor the latter undergoes a speed reduction for each small current change leading to a rise in the differential speed. If the V-belt pulleys 11, 12 are appropriately constructed motor 14 can be replaced buy a brake.
In Figure 2 the V-belt pulley 3' for driving the centrifuge shell 5 is fixed to the V-belt pulley 11 for driving the screw conveyor. The further construction and operation of this drive are the same as described in connection with Figure 1.
Claims (3)
1. Continuously operating screw centrifuge with a rotatably drivable centrifuge drum comprising a drum shell and a screw conveyor rotating in the drum with a differential speed compared with the drum shell, drum shell and screw conveyor being driven by means of a motor via a planetary gear, whilst a second planetary gear is associated with the latter and both planetary gears can be driven by means of a main drive motor and interchangeable
V-belt pulleys and the drive shaft of the second planetary gear is driven by a motor connected to a measuring and control unit, wherein the second planetary gear with its case is rotatably mounted on the motor shaft of the main drive motor and the driven shaft of the second planetary gear is fixed to the motor shaft of the main drive motor.
2. Continuously operating screw centrifuge according to claim 1, wherein the V-belt pulley for driving the centrifuge shell is fixed to the V-belt pulley connected to the second planetary gear for driving screw conveyor.
3. Continuously operating screw centrifuge substantially as described herein with reference to and as shown in Figures 1 and 2 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8116542A GB2099334B (en) | 1981-05-28 | 1981-05-28 | Drive for screw centrifuge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8116542A GB2099334B (en) | 1981-05-28 | 1981-05-28 | Drive for screw centrifuge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2099334A true GB2099334A (en) | 1982-12-08 |
| GB2099334B GB2099334B (en) | 1985-10-02 |
Family
ID=10522146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8116542A Expired GB2099334B (en) | 1981-05-28 | 1981-05-28 | Drive for screw centrifuge |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2099334B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5342279A (en) * | 1992-08-18 | 1994-08-30 | Alfa Laval Separation Inc. | Decanter centrifuge having dual motor drive |
| US5792039A (en) * | 1996-05-29 | 1998-08-11 | Ecc International Ltd. | Decanter centrifuge for separating feed suspension into fractions and method for operating same |
| US5857955A (en) * | 1996-03-27 | 1999-01-12 | M-I Drilling Fluids L.L.C. | Centrifuge control system |
| EP1129782A2 (en) * | 2000-03-03 | 2001-09-05 | Hiroshi Kitada | Vertical type solid-liquid separating apparatus |
| US6368264B1 (en) * | 1999-03-29 | 2002-04-09 | M-I L.L.C. | Centrifuge control system and method with operation monitoring and pump control |
| CN105032627A (en) * | 2015-06-30 | 2015-11-11 | 西南石油大学 | Dual-drum well drilling rock waste spin-dryer |
| WO2021128364A1 (en) * | 2019-12-23 | 2021-07-01 | 田丽华 | Environmentally friendly centrifugal wastewater treatment device |
-
1981
- 1981-05-28 GB GB8116542A patent/GB2099334B/en not_active Expired
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5342279A (en) * | 1992-08-18 | 1994-08-30 | Alfa Laval Separation Inc. | Decanter centrifuge having dual motor drive |
| US5857955A (en) * | 1996-03-27 | 1999-01-12 | M-I Drilling Fluids L.L.C. | Centrifuge control system |
| US5792039A (en) * | 1996-05-29 | 1998-08-11 | Ecc International Ltd. | Decanter centrifuge for separating feed suspension into fractions and method for operating same |
| AU731284B2 (en) * | 1996-05-29 | 2001-03-29 | Imerys Minerals Limited | Decanter centrifuge |
| US6368264B1 (en) * | 1999-03-29 | 2002-04-09 | M-I L.L.C. | Centrifuge control system and method with operation monitoring and pump control |
| EP1129782A2 (en) * | 2000-03-03 | 2001-09-05 | Hiroshi Kitada | Vertical type solid-liquid separating apparatus |
| EP1129782A3 (en) * | 2000-03-03 | 2002-08-14 | Hiroshi Kitada | Vertical type solid-liquid separating apparatus |
| CN105032627A (en) * | 2015-06-30 | 2015-11-11 | 西南石油大学 | Dual-drum well drilling rock waste spin-dryer |
| WO2021128364A1 (en) * | 2019-12-23 | 2021-07-01 | 田丽华 | Environmentally friendly centrifugal wastewater treatment device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2099334B (en) | 1985-10-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |