Sabroe shaft seal Installation guide

Brand: Sabroe

Model: shaft seal

Type: Installation guide

Mounting instruction 17 September 2015

011604 (replaces 0171-946)

Shaft seal for SAB 110 screw compressors

3-4 mm before tightening of screws

Fig. 1

Spare part sets comprise:

Designation Pos. no. Quantity Part no.

Shaft seal complete for SAB 110 160 1 1332-178

Each set consists of:

Designation Pos. no. Quantity

Cast-iron seat A 1

Rotating part with carbon face B 1

Outer O-ring C 1

Inner O-ring D 1

O-ring for cover 81 1

Set screw E 3

Carbon slide ring F 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 4

The shaft seal must ensure complete tightness between the compressor shaft and the compressor housing, 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 seal is a slide ring type, consisting of a stationary cast-iron seat, pos. A, which is positioned in the shaft seal

cover, pos. 165. 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. 162, seals against the shaft seal cover, pos. 165.

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 tightened by means of the static O-ring, pos.160.

Note: Be extremely careful with the lapped surfaces of the cast-iron seat and the carbon face. The slightest

scratch will impair its sealing effect.

Removing the shaft seal

Before taking out the shaft seal, dismantle the motor as described in the Instruction Manual section, “Dismantling

and Assembly of Motor and Coupling”.

• Take the pressure off the compressor (as described in the Instruction Manual) and dismantle the cou-

pling.

• Remove all the screws, pos. 167. The shaft seal cover, pos. 165, can then be pulled out over the shaft. If

the cover sticks, so that it is not possible to remove it manually, use two cover screws, pos. 167, fitted in

the threaded holes of the flange to help release it. The cast-iron seat, pos. A, will come out together with

the cover. It can now be pushed out as shown in Fig. 2.

•

Fig. 2

• By means of the dismantling tool, as illustrated in Fig. 3, pull the rotating part of the shaft seal out of the

compressor.

• Remember to first loosen the three set screws, pos. E.

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 4

3-4 mm before tightening of screws

Fig. 3

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:

• Clean the shaft seal cover, pos. 165, and the rotor shaft thoroughly. Pay special attention to burrs from

the installation of former shaft seals. Slight grinding of the shaft surface with emerald paper may be

necessary 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 part with

the fingers. DO NOT use any kind of grease for the installation.

• Mount the balance piston, pos. 168, as shown in Fig. 3, and take care not to damage the O-ring, pos.

163.

• Carefully press the rotating part in over the rotor shaft until it touches the conical step of on the rotor shaft

as shown in Fig. 1. Do not press against the carbon ring but use two screw drivers or similar as illustrated

in Fig. 4 in order not to overload the bellows of the shaft seal. Make sure that the inner ring has full con-

tact with the shaft step.

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 4

Fig. 4

• Then tighten the 3 set screws, pos. E, in turns with the supplied 3 mm Allen key until reaching slight con-

tact with the shaft surface. Then carefully 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 correct torque, 4

Nm.

• Install the static seat, pos. A, and the O-ring, pos. 162, in the shaft seal cover by pressing it 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 pin, pos. 83, catches the slot in the seat, pos. A.

• Carefully ease the shaft seal cover in over the shaft until it just touches the carbon face of the rotating

part. Before the screw, pos.167, is tightened, there should be a gap of 3 to 4 mm between the two flang-

es, as shown in Fig. 1. This indicates that the shaft seal is installed in the correct position. Check to en-

sure that the O-ring, pos. 166, is correctly placed.

• Tighten the screws, pos. 167, in turns. Be careful not to damage the shaft seal by tightening unevenly.

Tighten the screws with the torque indicated in the Instruction Manual.

• Fit the coupling as described in the Instruction Manual, and turn the shaft (by hand) to check that it ro-

tates freely.

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 4 of 4

Sabroe shaft seal Installation guide

Brand: Sabroe

Model: shaft seal

Type: Installation guide

Download PDF

report

Sabroe shaft seal Installation guide

Sabroe shaft seal Installation guide

Related papers

Other documents