Sabroe shaft seal Installation guide

Brand
Sabroe
Model
shaft seal
Type
Installation guide
Mounting instruction 04 September 2015
Mounting instruction
011596 (replaces 0171-925)
Shaft seal for screw compressor types SAB 128 and 163
80
OI L IN
OI L OUT
•
81
••
D
•
B
•
C
•
A
•
•
E
G
•
F
•
83
•
120
3 to 4 mm
Spare parts sets comprise:
Designation Pos. no. Quantity Part no.
Shaft seal complete for SAB 128
Shaft seal HD complete for SAB 128 160 1 1332.068
1332.222
Shaft seal complete for SAB 163
Shaft seal HD complete for SAB 163 160 1 1332.162
1332.223
Each set consists of Pos. no. Quantity
Cast-iron seat
Rotating part with carbon face
Outer O-ring
Inner O-ring
O-ring for cover
A
B
C
D
81
1
1
1
1
1
Johnson Controls Denmark ApS
Christian X's Vej 201 ∙ 8270 Højbjerg ∙ Denmark
Phone +45 87 36 70 00 ∙ Fax +45 87 36 70 05 ∙ www.sabroe.com
CVR No 19 05 61 71
Page 1 of 3
The shaft seal must ensure complete tightness between the compressor shaft and the compressor casing, so that
the inside of the compressor is completely sealed off from the atmosphere.
The shaft seal type 680 has a built-in metal bellow in its rotating part which, apart from ensuring tightness, also
assimilates axial displacement and provides the necessary compressive force between the two slide faces men-
tioned below.
The shaft seal is a slide ring type, consisting of a stationary cast-iron seat, pos. A, which is positioned in the shaft
seal cover (80). Rotation is prevented by a pin, pos. 83.
The end face of the cast-iron seat is lapped to ensure that the slide face seals tightly. The O-ring, pos. C, seals
against the shaft seal cover (80).
The rotating part of the shaft seal, in which the carbon face, pos. F, is fitted, is fastened on the rotor shaft by
means of the 3 set screws, pos. E, and sealed by means of the stationary O-ring, pos. D.
Note: Be extremely careful with the lapped surfaces of the cast-iron seat and the carbon face. The slightest
scratch will impair the sealing effect.
Dismantling of the shaft seal
• Take the pressure off the compressor as described in the instruction manual, and dismantle the coupling.
• Remove all the screws, pos. 82. The shaft seal cover, pos. 80, can then be pulled out over the shaft. If
the cover sticks and is thus impossible to remove manually, use the two cover screws fitted in the threa-
ded holes of the flange to help release it.
Note that the holes are not threaded all the way, so it is advisable to insert a steel pin with dia. 8 x 40
before fitting the screw into the hole.
The oil splash ring, pos. 113, and the cast-iron seat, pos. A, will come out with the cover.
• After the 3 set screws, pos. E, have been loosened a couple of turns, the rotating part with the carbon
ring can now be pulled out over the shaft. Normally, auxiliary tools are not needed.
Mounting of the shaft seal
Due to the potential risk of releasing refrigerant and oil to the environment if installation is not performed with the
necessary care, it is important to follow this procedure closely:
• Thoroughly clean the shaft seal cover, pos. 80, and the rotor shaft. Pay special attention to burrs from the
installation of former shaft seals. Slight grinding of the shaft surface with emerald paper may be necessa-
ry to remove sharp edges.
Apply a thin layer of clean lubrication oil (same type as used for the compressor) to the shaft surface and
the O-rings. Avoid touching the carbon face of the rotating parts with the fingers.
DO NOT use any kind of grease for the installation.
• If a driving pin has been fitted in the hole, pos. G, it MUST be removed. Do this by first taking out the
balancing piston, pos.120. Remember to mount the piston again.
• Carefully press the rotating part over the rotor shaft until it touches the step of the rotor shaft as shown in
the drawing.
Johnson Controls Denmark ApS
Christian X's Vej 201 ∙ 8270 Højbjerg ∙ Denmark
Phone +45 87 36 70 00 ∙ Fax +45 87 36 70 05 ∙ www.sabroe.com
CVR No 19 05 61 71
Page 2 of 3
DO NOT press against the carbon ring. Use the necessary force to the ring part behind the bellows only.
Make sure that the inner ring has full contact with the shaft step.
• Tighten the 3 set screws, pos. E, in turns until reaching slight contact with the shaft surface. Then careful-
ly cross-span with a slightly increasing torque while keeping aware that the rotating part must remain in
center with the rotor shaft. Finally tighten to the correct torque.
Use 4 Nm for the normal shaft seals, pos. no. 1332.068 and 1332.162.
Use 7.5 Nm for the HD shaft seals, pos. no. 1332.222 and 1332.223.
An Allen key is included in the delivery.
After carefully tightening, press the outer ring, without touching the carbon face, to make sure that the outer ring
can axially move freely on the shaft.
Install the static seat, pos. A, with the O-ring, pos. C, by pressing it into the cover until it gains contact with the
bottom face. Avoid touching the sliding face with your fingers, use a clean cloth or similar when pressing. Make
sure that the retaining pin, pos. 83, catches the slot in the seat.
A few drops of clean oil may be applied to the sliding face.
Guide the shaft seal cover carefully over the shaft until the shaft seal seat just touches the carbon face of the rotat-
ing part. A gap of 3-4 mm between the shaft seal cover and the compressor housing will indicate that the shaft
seal is installed in the correct position. It may be necessary to do this check before mounting the O-ring, pos 81, in
the cover but remember to use the O-ring when the cover is installed permanently. Tighten the screws, pos. 82, to
the correct torque according to the general description in the instruction manual.
Mount the oil throw-off ring, pos. 113.
Mount the coupling as described in the instruction manual, and turn the shaft by hand to check that it is running
smoothly.
Jens Lund Christensen
Lead Engineer, Quality & Technical Design
Industrial Refrigeration Parts Centre
Building Efficiency
Direct no.: +45 87 36 77 42
Fax no.: +45 87 36 75 05
e-mail: [email protected]
Johnson Controls Denmark ApS
Christian X's Vej 201 ∙ 8270 Højbjerg ∙ Denmark
Phone +45 87 36 70 00 ∙ Fax +45 87 36 70 05 ∙ www.sabroe.com
CVR No 19 05 61 71
Page 3 of 3
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Sabroe shaft seal Installation guide

Brand
Sabroe
Model
shaft seal
Type
Installation guide
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