Variable Speed Coupling: Type Delta SC

The Compact Scoop Controlled Fluid Coupling:

Delta SC fluid couplings by Fluidomat are self supported compact - scoop control variable speed fluid coupling with flange connection on both ends.

Enlarged 360° View

Delta SC couplings can replace the rotating body coupling design type SCR of Fluidrive type PSC of Pembril and type SCR of Sime on one to one basis and will fit into the existing drive set up with minor modification. The Delta SC couplings provide complete solution to the problems of above mentioned rotating body couplings having operational maintenance and alignment problems inherent to the type of these couplings as experienced by several users from different sites. Delta SC couplings are a perfect solution to the problems of above rotating body fluid couplings.

Delta SC are totally enclosed and self supported compact scoop control fluid couplings without any weight reaction on driving or driven machine. The oil sump is built with the stationary housing and oil is introduced into the working circuit through a separate oil pump. The oil circulates through the working circuit and finally passes to the outer casing and is collected by the sliding scoop tube.

The oil in the working circuit is governed by the position of scoop tube. The position of scoop tube can be governed through suitable electric actuator or manually by hand lever. On the input and output ends, suitable flexible couplings are provided for the shaft connections. A suitable oil cooler is provided in the circuit to cool the circulating oil.

DESCRIPTION:

• INPUT SHAFT
• UPPER HOUSING
• IMPELLER
• ROTOR
• PRIMARY CASING
• SECONDARY CASING
• SCOOP TUBE
• OUTPUT SHAFT
• BOTTOM HOUSING
• HALF GEAR COUPLING
• LABYRINTH SEAL WITH OIL SEAL
• WORKING CIRCUIT

OPERATION:

The sliding scoop tube governs the oil level in the working circuit depending on its (scoop tube) position between 0 to 100%. By varying the oil level in the working circuit, the torque transmission capacity of the coupling varies, thus changing the slip in the coupling and provides stepless speed variation. Delta SC couplings provide stepless speed regulation in the range of 4:1 as standard for centrifugal loads like fans and pumps. They also provide continuous declutching duty for select drives.

Comparison of Delta SC with Rotating Body scoop controlled couplings

Fluidomat -Delta SC	Fluidrive,Sime / Pembril rotating body Type SCR/ PSC
Fully self -supported	Not self-supported.
No weight experienced on the motor and machine bearings by the rotating parts.	The weight of primary parts including rotating oil sump and oil volume is to be supported by the motor bearing.
The weight of primary parts including rotating oil sump and oil volume is to be supported by the motor bearing.	Open running rotational body.
Fully enclosed parts in a simple way. Totally safe and no fear to operators.	Not possible. Accident prone with coupling fly off and potent danger of damages. Thin Driving plate connection supporting coupling weight on input side is must in types 24 and 25 of SCR/PSC designs.
Not possible. Accident prone with coupling fly off and potent danger of damages. Thin Driving plate connection supporting coupling weight on input side is must in types 24 and 25 of SCR/PSC designs.	Not possible. Accident prone with coupling fly off and potent danger of damages. Thin Driving plate connection supporting coupling weight on input side is must in types 24 and 25 of SCR/PSC designs.
Not possible. Accident prone with coupling fly off and potent danger of damages. Thin Driving plate connection supporting coupling weight on input side is must in types 24 and 25 of SCR/PSC designs.	Complete dismantling of the coupling is required for repair.
Complete dismantling of the coupling is required for repair.	Slower response times, as the scoop tube is changing the oil flow rate in the oil sump, which means it is not directly in the working oil circuit.
Smaller outer dia of rotating parts. Lower inertia.	Higher outer dia of rotating parts and thus higher peripheral speed and noise level. Higher inertia.
Higher outer dia of rotating parts and thus higher peripheral speed and noise level. Higher inertia.	Higher outer dia of rotating parts and thus higher peripheral speed and noise level. Higher inertia.

CHARACTERISTIC CURVE
(AT VARIOUS SCOOP TUBE POSITIONS BETWEEN 100% & 0%)

OIL FLOW CIRCUIT DIAGRAM

Selection and Power Rating

Delta SC couplings are offered in three different execution designated by a four digit system. The first three digits show the size of fluid coupling while the fourth digit shows the type. Thus the fourth digit as 1 can replace type SCR24R/PSC24, fourth digit as 2 can replace type SCR25/PSC25 and fourth digit as 3 can replace 26/25B of Fluidrive and Pembril makes.

Rating of Delta SC couplings in KW

Delta SC couplings are offered in eight standard sizes to cover a range upto 1100 KW. The rating table gives the power ratings at various input speeds.

RATING OF DELTA SC COUPLING IN KW

Input Speeds in RPM
Delta SC Model	750	900	1000	1200	1500	1800
0801,0802,0803	15	25	35	61	119	206
0901,0902,0903	26	42	60	104	200	311
1001,1002,1003	51	84	118	208	375	550
1101,1102,1103	72	135	170	300	523	575
1201,1202,1203	100	175	237	410	800	-
1301,1302,1303	185	326	400	715	930	-
1401,1402,1403	282	535	650	905	-	-
1501,1502,1503	750	905	1150	-	-	-

FLUIDOMAT MODEL: DELTA SC-0801 TO 1501

MODEL	B	H1* ALT 1	H2* ALT 2
SC-0801	481	355	395
SC-0901	497	355	447
SC-1001	735	457	500
SC-1101	735	457	525
SC-1201	735	559	559
SC-1301	1027	559	600
SC-1401	1148	711	711
SC-1501	1249	711	812

FLUIDOMAT MODEL: DELTA SC-0802 TO 1502

MODEL	B	H1* ALT 1	H2* ALT 2
SC-0802	563	355	395
SC-0902	578	355	447
SC-1002	735	457	500
SC-1102	740	457	525
SC-1202	788	559	559
SC-1302	1027	559	600
SC-1402	1148	711	711
SC-1502	1249	711	812

FLUIDOMAT MODEL: DELTA SC-0803 TO 1503

MODEL	B	H1* ALT 1	H2* ALT 2
SC-0803	760	355/400	395
SC-0903	760	355/400	447
SC-1003	972	435/465	500
SC-1103	1110	570	559
SC-1303	1280	570	600
SC-1403	1280	636	711
SC-1402	1148	711	711
SC-1503	1470	711	812

NOTE: ALL DIMENSIONS ARE IN mm.
^* Centre Height H1i is with oil tank placed separately from coupling.Centre Height H2 is with oil tank integral with coupling. The figures show coupling with integral oil tank i.e, as per centre height H2.

SCR/PSC Size	18	20	23	26	29	32	36	41
Equivalent Delta SC Model	080	090	100	110	120	130	140	150

Advantages of Delta SC Couplings

The following features of Delta SC are greatly advantageous and user friendly.

• Self-standing coupling, thus no weight reaction on driving and driven shaft.
• Rotating parts of coupling totally enclosed in self-standing body of the coupling.
• Rotating parts of coupling totally enclosed in self-standing body of the coupling.
• Low noise and vibration levels.
• Infinite speed variation in a wide range up to 4:1 as standard.
• Continuous declutching possible on select drives.
• Continuous declutching possible on select drives.
• and best performance of the oil cooler throughout the speed range.
• Simple in construction. Ease of assembly and disassembly and trouble shooting.
• Labyrinth Seals on shaft ensures no leakage from shaft ends.

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