DE1093153B - Mechanical seal - Google Patents

Description

GERMAN

The invention relates to mechanical seals for rotating shafts and is particularly concerned with solahe, which are normally exposed to high temperatures, as z. B. at the drive shaft one Centrifugal pump for hot boiler feed water of the Case is.

In such mechanical seals there is usually one that surrounds the shaft and is fixedly arranged on it Sleeve is provided on which a sealing ring rests in a sealing manner, which in turn seals against a fixed sealing ring ζ. Β. is pressed on by means of spring force. It is known the fixed Sealing ring against the housing by means of an elastic seal.

It is also known such Gleitringdicihtungen to cool with the aid of a coolant. To convey this coolant you can drive the Take advantage of the shaft to be sealed, and such a mechanical seal has become known in which the coolant by a turbine-like device operated by the shaft from a coolant inlet a coolant outlet is conveyed and outside the machine or pump housing a special one Cooler passes through.

The invention makes use of these measures known per se and aims to provide a seal to provide in which an effective cooling of all parts of the seal is achieved and wherein the coolant inlet and outlet in a bearing flange attached to the fixed machine or pump housing is trained. A mechanical seal according to the invention is designed so that one on the collar with the shaft rotating shaft sleeve one end of a compression coil spring rests, the other end End presses against the rotating sealing ring, which slides on the stationary sealing ring, wherein a stationary sleeve comprises the circumferential sleeve, on its periphery a screw conveyor for Has conveying the cooling liquid, which is fastened by a in a on the pump or other housing Part of the coolant inlet located in the space between the two sleeves over the surface of the two sliding rings flows in, and they conveyed into a circumferential part attached to the shaft sleeve, which is provided with radial openings that the cooling liquid to the outside of the fixed Cuff and so promote to the coolant outlet, which is located in one of the pump or other housing attached Teid is located. The invention is based on the combination of these known per se See individual elements for which no element protection is claimed.

To return the coolant in the vicinity of the coolant inlet it is provided that the Mechanical seal

Applicant:

Flexibox Limited,
Manchester, Lancashire (UK)

Representative: Dr. W. Schalk

and Dipl.-Ing. P. Wirth, patent attorneys,

Frankfurt / M., Große Eschenheimer Str. 39

Claimed priority:
Great Britain 9 November 1956

Frederick Benjamin Po-rges, Manchester, Lancashire

(Great Britain),
has been named as the inventor

stationary sleeve has a portion which extends over the outlet side of the radial openings and the pump housing from corrosion or pitting by the liquid escaping through these openings protects, which flows through further openings in a space connected to the coolant outlet.

The invention is explained with reference to the drawings, for example, namely shows

1 shows a longitudinal section of a mechanical seal with means for cooling in an inventive Execution information,

FIG. 2 is an end view of the seal according to FIG. 1.

On the shaft a, the z. B. can be a pump shaft, a shaft sleeve b is keyed, which has a collar c against which one end of a compression coil spring d rests, the other end of which presses against a collar on the circumferential sealing ring e. In this there is a sealing ring f, which rests against the outside of the shaft sleeve b . The sealing ring e creates a seal through its contact with the stationary sealing ring g, which presses on an (elastic) sealing ring h , which is located in the fixed part j , which is screwed to a member k , which in turn is screwed to the pump or other housing . If desired, a number of compression coil springs with a small diameter can also be arranged between the sleeve b and the circumferential sealing ring e.

009 648/228

B on the shaft sleeve, a ring is secured η, the radial openings and further ο slots or cavity p between itself and the shaft sleeve contains b. On the input side of the slots or the cavity p there is an outer worm thread q in the shaft sleeve b , which opens on one side to the cavity r located between the rotating shaft sleeve b and a stationary sleeve ί and on the other side to the cavity p . The sleeve s, which can consist of a corrosion-resistant metal, has a part t which extends over the outlet side of the radial openings ο and at a distance therefrom and thus forms an annular cavity u between itself and the ring η . Passage openings ν in the stationary sleeve s connect the cavity u with the space w outside and around the stationary sleeve ί and through the axial bores χ in the sleeve s with a cavity v which leads to a coolant outlet ζ . The fixed sleeve s is held between the member k and the housing m .

At 3 there is a coolant inlet which leads to a cavity 4 and via an annular gap 5 to the cavity r located between the rotating shaft sleeve b and the stationary sleeve j.

In the arrangement described, the coolant is sucked from the inlet 3, the cavity 4, the annular gap 5 and the cavity r to the screw thread q , which guides it through the cavity p into the radial openings 0 , which in turn passes through the cavity and let the holes ν and the cavity W, the holes χ and the cavity ν reach the outlet ζ. A cooler (not shown) is arranged between connections ζ and 3.

The coolant is kept in constant circulation between the cooler, the space recessed around the stationary and circumferential sealing rings that form the mechanical seal, the driving screw thread q and the radial openings o, which it back into the cooler, namely from the parts separated from the mechanical seal that is to be cooled by it.

The aforementioned stationary sleeve s, which separates the coolant coming from the cooler from the coolant flowing back into the cooler, also serves to protect the pump housing around the radial openings ο from corrosion and destruction when the coolant hits these radial openings leaves.

In this arrangement, the parts of the mechanical seal for the shaft α and the guide system for the cooling liquid are used in a pump housing without this having to be modified. The external connections for the coolant are located in the screwed-on parts j and k and not in the pump housing m itself.

Claims (2)

PATENT CLAIMS: 1. Mechanical seal for rotating pump shafts or other shafts that are normally exposed to high temperatures, in which a rotating sealing ring is under spring load and cooperates with an elastic seal which is arranged between the inside of the rotating sealing ring and a part assigned to the shaft, characterized that one end of a compression coil spring (d) rests on the collar (c) of a sleeve (b ) rotating with the shaft (α), the other end of which presses against the circumferential sealing ring (<?) which is on the stationary sealing ring (g) slides, a fixed sleeve (s) the peripheral sleeve (&) which (q) has on its periphery a screw for feeding the cooling liquid from an attached in a to the pump or other casing (m) part ( ; ') located coolant inlet (3) flows into the space (r) between the two sleeves (b, s) over the surface of the two sliding rings (e, g) , and which conveys them into a circumferential part (s) which is provided with radial openings (0) and slots (/>) which convey the cooling liquid to the outside of the fixed sleeve (s) and thus reach the coolant outlet (z) which is located in a part (k) attached to the pump or other housing (jm). 2. Mechanical seal according to claim 1, characterized in that the stationary sleeve (s) has a part (i) which extends over the outlet side of the radial openings (0) and protects the pump housing from corrosion or pitting by the liquid exiting through this opening which flows through the openings (v) into the space (w) connected to the outlet (z) . Considered publications:
German Patent Nos. 851 578, 959 153;
British Patent No. 671 165. 1 sheet of drawings ® 009 648/228 11.60