RU58642U1 - SIDE PUMP SEAL FOR PUMPED LIQUID SEAL - Google Patents

Abstract

The proposed utility model relates to the field of hydraulic engineering and can be used in pumps with a mechanical seal of the drive shaft to seal the pumped fluid and prevent leakage of this fluid. The pump differs from the known designs in that the mechanical seal of the drive shaft consists of a heel mounted loosely on the shaft of the pinion gear and sealed against leaks, pressed against the thrust bearing fixedly in the front cover or housing and sealed against leaks by means of a spring placed in the axial hole of the drive shaft and resting, on the one hand, in a pin mounted motionless on the shaft of the drive gear, or an insert fixed in the axial hole of the shaft, and, on the other hand, in the movable a pin in contact with the fifth and installed in the diametrical bore of the drive shaft.

Description

The alleged invention relates to the field of hydraulic engineering and can be used in pumps with mechanical seal of the drive shaft to seal the pumped fluid and prevent external leakage of this fluid.

A known design of a serial pump for pumping petroleum products of the NMSh type manufactured by Livhydromash OJSC (see "Operation manual. Н42.878.00.000 РЭ") containing an mechanical seal, consisting of a thrust bearing, which is fixedly mounted in the front cover and sealed on the outer surface with a rubber ring and a heel in contact with it with a thrust sleeve, interconnected by a pin and rotating with a shaft by a pin, the heel being sealed with a rubber ring relative to the shaft, while pressing the heel with the thrust sleeve against the thrust bearing y is carried out by a spring mounted on the shaft and resting on a thrust ring fixed to the shaft.

The disadvantages of the design are:

- the complexity and unreliability of the mechanical seal of the shaft due to the large number of seal parts, leading to an increase in shaft length, weight and overall dimensions of the pump;

- large vibration of the pump due to the presence on the drive shaft of freely installed and rotating parts together with the shaft.

The objective of the proposed utility model is to simplify the design of the mechanical seal, increase its reliability and reduce vibration on the drive shaft.

The task is carried out in that the mechanical seal of the drive shaft consists of a heel mounted movably on the shaft of the drive gear and sealed on the shaft from leaks, pressed by means of a spring placed in the axial hole of the drive shaft to the thrust bearing installed

motionless in the front cover or housing and sealed against leakage by means of a spring placed in the axial hole of the drive shaft and resting, on the one hand, in a pin mounted motionless on the shaft of the drive gear, or an insert fixed in the axial hole of the shaft, and on the other hand, into a movable pin in contact with the fifth and installed in the diametrical bore of the drive shaft.

The cross-sectional pump is shown in FIG. 1 and, as an option, in FIG. 4., and mechanical seal versions with a spring bearing on a fixed pin — in FIG. 2 and FIG. 5, and supported by a sleeve fixed in an axial bore of the drive shaft - in FIG. 3, the pump consists of a housing 1, front cover 2 and rear 3, a pinion gear with a shaft 4 and a driven gear 5 with sliding bearings and a mechanical shaft seal, consisting of a thrust bearing 6, fixedly mounted in the front cover 2 or the housing 1 and sealed relative to the cover element 7; the heel 8, movably mounted on the shaft and sealed relative to the shaft by an element 9, pressed against the thrust bearing 6 by a spring 10, placed in the axial bore of the drive shaft and resting, on the one hand, on the pin 11 or insert 12 (see Figure 3), mounted motionless in the axial hole of the shaft, and, on the other hand, on the movable pin 13 installed in the diametrical hole of the shaft and in contact with the fifth 8, the Pump, see Figure 1, operates as follows.

When the gears rotate, the working fluid from the suction zone flows to the leading 4 and 5 driven gears and simultaneously to the front 2 and rear covers 3. The fluid in the front cover 2 flows to the thrust bearing 6 (see FIG. 2) and then through the unsealed hole along the shaft 4 to heel 8. Next, the fluid passage blocks the annular friction zone between the thrust bearing 6 and the fifth 8, which is pressed against the thrust bearing by a spring 10 installed in the axial hole of the drive shaft 4, through a movable pin 13 in contact with the fifth. On the other hand, the spring rests on a pin 11, which is fixedly mounted

in the diametrical hole of the drive shaft, or insert 12 (see FIG. 3), also fixedly mounted in the hole of the drive shaft.

According to the second embodiment of the mechanical seal (see Fig. 4 and Fig. 5), the liquid in the front cover 2 flows to the heel 8, which is movably mounted on the drive shaft and sealed by the shaft by the element 9, then along the uncompressed outer surface of the heel to the annular friction zone of the heel with the thrust bearing 6, which is fixedly mounted in the front cover 2 and the element 7 sealed relative to the cover. The heel is pressed against the thrust bearing by a spring 10 installed in the axial hole of the drive shaft 4, through the movable pin 13, placed in the shaft diameter hole and contacted with the fifth 8.

Thus, the placement of the spring inside the drive shaft greatly simplifies the design of the mechanical seal and reduces the dimensions of the drive shaft and the pump as a whole, and also reduces the level of vibration due to a decrease in the number of unbalanced parts rotating on the shaft.

It should be noted that the embodiment of the mechanical seal in Figure 4 is more reliable, because when the pressure in front of the front cover is exceeded, the force pressing the heel against the thrust bearing by the spring is added to the hydraulic pressure force, increasing the clamping force of the parts in the annular friction zone and the reliability of the pump sealing along the drive shaft.

Claims (1)

The mechanical seal of the drive shaft consists of a heel mounted movably on the shaft of the drive gear and sealed against leaks, pressed by means of a spring placed in the axial hole of the drive shaft, to the thrust bearing, which is fixed in the cover or housing and sealed against leakage .