Damper Selection And Sizing - Honeywell AUTOMATIC CONTROL SI Edition Engineering Manual

LINKAGE
ARM
LINKAGE
ROD
TORQUE APPLIED TO DAMPER = 6 Nm/m
0.75
0.50
0.25
0
0 0.05 0.10 0.15
3
LEAKAGE IN M /s PER M
NOTE:
LEAKAGE OF A SPECIFIC DAMPER DEPENDS UPON THE HEIGHT AND
WIDTH RELATIONSHIP AS WELL AS THE AREA. THE SHADED AREA
SHOWS THE RANGE OF LEAKAGE FOR A GIVEN AREA.
Fig. 18. Graphic Presentation of Leakage Performance.
ENGINEERING MANUAL OF AUTOMATIC CONTROL
DUAL
LINKAGE ARM
LINKAGE ARM
AXLE SCREWS
Fig. 17. Typical (Opposed Blade) Damper Construction.
2
OF DAMPER AREA
0.20 0.25 0.30 0.35
2 2
OF DAMPER AREA (M /s)
M15302

DAMPER SELECTION AND SIZING

TRUNION
BEARING
HORIZONTAL
FRAME MEMBER
DAMPER BLADE
SIDE
SEAL
BLADE
AXLE
DRIVE
AXLE
THRUST
WASHER
AXLE BEARING
VERTICAL
FRAME MEMBER
50
LEAKAGE VS DAMPER SIZE
APPLIED TORQUE 6 Nm
FROM ACTUAL TEST DATA
45
40
35
30
25
20
15
10
5
0
0.2 0.4
A DIMENSION
DAMPER SIZE IN INCHES
TOTAL LEAKAGE =
B-DIMENSION LEAKAGE + A-DIMENSION LEAKAGE
WHERE:
A-DIMENSION = OUTSIDE DIMENSION PARALLEL TO
THE DAMPER BLADES
B-DIMENSION = OUTSIDE DIMENSION PERPENDICULAR
TO THE DAMPER BLADES
Fig. 19. Low Leakage Dampers.
453
M10436
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.6 0.8 1.0 1.2
B DIMENSION
C3201