DE1957598U - SEAL FOR SEALING A TURBINE OR COMPRESSOR SHAFT. - Google Patents

Description

Dipl-lng. Werner Dorn *>"· lÄUSÄ. ¹ * * ^{eteuar 1967}

(Schlachtensee) bank account 9O8O1

Berliner Bank A.-G., Depositen-Kassel 46 Fernruf 84 55 52 Berlin 37, Argentinische Allee 2 i-ernrur 84 es 52

Berlin-Ruf O311 Posischeckkonto Berlin West 10648

Company STAL-LAVlL TimBIW AKTIEBOLAG-Finspong / Sweden

S SS SSSS SS SSSSSÜSSS! SS SSSSSS

Seal for sealing a turbine or compressor shaft.

iSSS ™ SI S3 SS! S SSSS SS! SS SSSS SSSS SS SS SI SS SS SS SuS SS SS SSSS-SS SSSS ^ SSSSSSSSSSSSS SS SS SS SSSS SS SS SSSS SSSSSS SS SS SSSS SS ESSSSS SSSS

The object of the innovation is a seal for sealing a turbine or compressor shaft by means of a shaft seal arrangement that works with two different barrier gases _{and is mounted between a chamber containing steam from heavy water (D 2} O) and a bearing and consists of a none of at least two adjacent stuffing boxes exists with associated chambers and with a supply line for sealing air with higher than atmospheric pressure in the gland chamber further away from the steam chamber, as well as a discharge from the chamber adjacent to the steam chamber to a leakage steam condenser from which DoO exits. In the case of such a shaft seal, the arrangement is such that air saturated with DgO is drawn off from the leakage steam condenser into a drying device, from which D ₂ O emerges, and furthermore the dry air, with the addition of atmospheric air dried in a further drying device, is in the stuffing box chamber further away from the steam chamber. The purpose of this is to prevent DgO vapor from coming into contact with the atmospheric air and the water vapor it contains and thus avoiding contamination of the D ₂ O vapor.

The innovation aims at an improved shaft seal with the aim of maintaining a constant pressure in the two the stuffing box chambers adjacent to the steam chamber in the event of changes in the volume of sealing air due to the enlargement of the leakage gap Wear on the sealing edges of the associated stuffing boxes. The innovation is essentially characterized in that in the stuffing box that is further away from the steam chamber

Chamber leading pipeline a fan and a return line is provided from the pressure side to the suction side, in which a pressure-controlled regulating element is attached, and also a supply line for outside air to the suction side of the pipe, in which a regulating device is attached, which is controlled by the pressure on the suction side the line is controlled. By these measures, a sealing system is obtained, which is in the two adjacent to the steam chamber Stuffing box chambers maintain a constant pressure with different seal flows through the associated stuffing boxes maintains, i.e. a very constant control, which makes it possible to supply the shaft seal with the sealing air quantities at constant line pressure in front of and behind the fan, caused by leak changes due to changes in the leakage gap on the sealing edges of the stuffing boxes

In the drawing, a shaft sealing arrangement is shown as an exemplary embodiment shown schematically according to the hiring »

1 with a Y / elle, for example a _{turbine operated with D 2} 0 steam, and with 2 a steam chamber of the turbine * The shaft 1 is mounted in a bearing 3. Between the chamber and the bearing 3, the shaft 1 is enclosed by a cable arrangement which consists of a number of stuffing boxes 4, 5 »6 and 7, which are separated from one another by chambers I, II, III and IT".

From the bearing 3 leak oil occurs in the chamber I, in which by means of a Suction fan 8, a negative pressure is generated, and into the air leaking from the opposite side along the skin the chamber II enters, the latter ^ air at atmospheric pressure through a pipe 9 is supplied. Thus becomes a Air flow directed towards the bearing is generated over the sealing edges of the stuffing box 4, which allows oil to pass through it Stuffing box prevents »

Dry sealing air with a pressure above atmosphere is fed to chamber III through a pipe 10. Part of this air flows into chamber II, which contains air at atmospheric pressure, while another part enters chamber IT, from where air and steam emerge the chamber 2 enter a pipeline 11 into a Leekdampf condenser 12 »From this condenser D ₂ O is diverted via a pipe 13,

while air saturated with D ₂ O is drawn off into a pre-dryer 14, from which DpO exits via a pipe 15. From the pre-dryer 14, the medium is passed through a stream dryer 16 which, in the embodiment shown, is a circulating absorption air dryer. Dry air is sucked out of the after-dryer 16 by a blower 17 and fed via a drilling line 10 to chamber III *

Behind the fan 17, air from the pipeline 10 is directed to the suction side of the fan returned through a return line 18, in to which a valve 19 is attached, which is controlled by the pressure in the line 10. The pressure in line 10 behind the fan can thus be kept constant. The pressure on the suction side of the fan in the line 10 can also be thereby be kept constant so that the air drawn off by the fan 8 via the stuffing boxes 5 and 6 is replaced by air which is fed to the line 10 via a line 20 with a dryer 21 · The pressure on the suction side in the line 10 is kept constant by a regulating valve 22, which is controlled by the pressure in the Leekdampf condenser

If the leak in the stuffing box 5 as a result of wear of the Diehtungskanten increases, the air flow in the pipe 10 after the chamber III will increase. As a result, the valve 19 is throttled and the pressure in the leakage steam condenser 12 drops, which causes valve 22 to open to allow atmospheric air to enter. If the leak is through the stuffing box after chamber IV increases, the air flow in line 10 to chamber III increases. As a result, the valve 19 is throttled. The pressure in the leakage steam condenser increases because more air enters via the line 11, but a smaller air flow through the return line 18 has an undiminished flow through the valve 22 result.

As shown in the drawing, the returned air (or a partial amount) is heated in a heating device 25, which is installed in the pipe 18, from where the air is passed through the (dryer 16. This is used for absorption the moisture given off by the medium in the pipeline 10. The medium is transferred from the dryer into line 10 the pre-dryer 14 returned.

_ 4. -

Claims (2)

1. Seal for sealing a turbine or compressor shaft by means of a shaft seal arrangement that works with two different barrier gases and is positioned between a steam made of heavy water (DpO) containing chamber and a bearing is attached and of a row of at least two adjacent Stuffing boxes with associated chambers and with a supply line for sealing air with higher as atmospheric pressure in the gland chamber further away from the steam chamber, characterized in that in the to the stuffing box chamber (III) further away from the steam chamber leading Eohrleitung (10) a fan (17) and a return line (18) is provided from the pressure side to the suction side, in a pressure-controlled regulating member (19) is attached, and also a supply line for outside air (20) to the suction side of the Pipeline (io) in which a regulating element (22) is attached, which is controlled by the pressure on the suction side of the line (10) will. 2. Seal according to claim 1, characterized in that in the return line (18) a heating device (23) and an air dryer, preferably a rotating absorption air dryer (16) is attached, which absorbs moisture given off by the air flowing through the dryer to the fan (17) . ■ <3! TeV ^ i VT 'Ifc ^' ter ^ tVC ¹ 215 * Eyelet fse-hl
"S: -"-..-.-'- »- c» ^! ir.4 * Ä -sich i «Aa Aisseaki * ..- V * " - · toi. ^ afiog 7i £: * ---- '' "■ =" ■ * '· - - ■ *