SU1268822A1 - Slot sealing of centrifugal pump impeller - Google Patents

Abstract

The invention relates to pump engineering, in particular to hydrodynamic seals of rotating shafts. The purpose of the invention is to increase durability when working on abrasive media by separating leaks. In the outer ring 1, mounted on the pump housing 2, there is a sealing ring 5 with screw channels 6 and a confused annular gap 7 and an annular chamber (QC) 8 are made. On the end surface of the ring 5 from the side of QC 8, bevelled faces 9 are made. slot 7 with channels 6. To reduce leakage (A to 00 00 tsD GS

Description

ring 1 is made in the form of a casing IO and sleeve I1 with conical surfaces between which an elastic element 12 is installed. The medium with mechanical inclusions in KK 8 acquires two mutually perpendicular rotations, forming a hydrocyclone with mechanical inclusions in its center. Part of the flow passes through the gap & g, providing the circulation of the medium necessary for the formation of a hydrovortex from KK 8 to the jog sinus, the other part passes through the gap dj, and through channel 6 there is a medium with mechanical inclusions directed to the channels 6 The presence of a tapered connection of the yoke 10 with the sleeve 11 provides for the perception of axial forces, 1 hp. f - ly, 2 ill.

one

The invention relates to pump engineering, and more specifically to hydrodynamic seals of rotating shafts.

The purpose of the invention is to increase durability when working on abrasive media by separating leakage and reducing leakage by reducing the gap between the inner and outer rings.

Figure 1 shows schematically the slit seal of the impeller of a centrifugal pump, a longitudinal section; figure 2 - scan the sealing ring.

The seal contains an outer ring I fixed in the pump casing 2 and an inner ring 3 mounted on the impeller 4. The outer ring 1 has a sealing ring 5 with screw channels 6 and a confused annular gap 7 with a sharp edge and an annular chamber 8 2), which connects the annular gap 7 with the channels 6 of the sealing ring 5, while on the end surface of the sealing ring 5 from the side of the annular chamber 8 are beveled flats 9 (figure 2). The outer ring I is made in the form of a ring O and a sleeve 11 with conical surfaces, between which an elastic element 12 is mounted. The impeller of the pump with the body 2 forms a baffle 13.

The proposed device works as follows.

Medium with mechanical inclusions from the area with pressure P through the cofusor slot 7 with a gap of 5j,

The latter ensures the uninterrupted passage of mechanical particles into the cavity of the annular chamber 8, where it acquires a vortex motion, which is facilitated by the effect of disrupting the flow from the sharp edge B and deceleration of the flow velocity during expansion. In the resulting vortex centripetal forces prevail, under the action of which the mechanical inclusions are concentrated in the center of the vortex. At the same time, the vortex due to the disk friction of the rotating inner ring 3 has a circular rotation. Thus, in the annular chamber 8, the medium, acquiring, during operation, a slit seal for mutually perpendicular rotation, forms a hydrocyclone with mechanical inclusions in its center (Fig. 2). The level of concentration of mechanical inclusions in the center of a hydrocyclone is determined by its energy, which depends on the speed and amount of the medium entering the annular chamber 8. To provide the required energy, the hydrovortex gap 2. is set so that it provides the necessary circulating medium from the annular chambers 8 into the disc slot 13 formed by the wheel disc and the pump housing 2, i.e. in the area of pressure P. Circulation of ci is achieved due to the fact that the pressure in the groove of the pump's pump is distributed according to a parabolic law and the smaller it is to the pump axis. Another part of the flow passes through the screw channels 6 and the gap of the jaw seal j. At the same time through screw kana / gy 6 goes

medium with mechanical inclusions.

Claims (2)

5 claims 1. The slotted seal of the impeller of a centrifugal pump containing an outer ring, fixed 10 in the pump casing, and the inner ring mounted on the impeller, characterized in that, in order to increase durability when working on abrasive 15 media by separating the leaks, an o-ring with screw channels is installed in the outer ring and a confuser ring slot with a sharp edge and a ring chamber 20 are made, communicating an annular gap with the channels of the seal ring, and bevelled 25 on the end surface of the seal ring from the side of the annular chamber flattering. 2. Seal by π. I, which consists in the fact that, in order to reduce leakage by reducing 30 gap between the inner and outer rings, the latter is made in the form of a cage and a sleeve with conical surfaces between which an elastic element is installed. VNIIIPI ί Custom polygr. ave, city of Uzhhorod, st. Project, 4