RU168011U1 - SINGLE AUGER PUMP PUMP - Google Patents

Abstract

The utility model relates to the field of pump engineering and can be used in water supply systems, petrochemical, nuclear and other industries where pumps are required for pumping various kinds of liquids, including aggressive and heterogeneous in density and viscosity. An axial-shaped screw pump contains a housing with axial inlet and a spiral bend, a rotor including a shaft with a cantilever mounted impeller, made in the form of a screw with screw blades mounted in bearings that are fixed in the case of bearings, the bearing with the impeller is isolated from the discharge chamber through the seal. The seal is made of silicon carbide face in the form of rings forming a friction pair, one of which is installed in the housing of the bearing bearings, and the other on the shaft with the possibility of preloading it by a spring. A cuff is installed in the body of the mechanical seal, which protects the bearing cavity from ingress of the pumped liquid. The single-screw pump is indispensable for pumping complex liquids, has a higher capacity and suction capacity, the ability to pump liquids with a high content of mechanical impurities, has a high power ratio, i.e. more compact dimensions and less weight, as well as ease of use, maintenance and repair.

Description

The utility model relates to the field of pump engineering and can be used in water supply systems, petrochemical, nuclear and other industries where pumps are required for pumping various kinds of liquids, including aggressive and non-uniform in density and viscosity.

Known osediagonal screw pump containing a housing with an axial inlet, a spiral outlet, a rotor including a shaft on which the impeller with screw blades is mounted cantilever, mounted in bearing bearings that are rigidly connected to the spiral outlet. The separation of the bearing cavity from the discharge cavity is carried out by rubber rings. (RF patent No. 2075653 C1, IPC F04D 3/02, published March 20, 1997).

Another axial-diagonal screw pump, consisting of a conical inlet housing, a radial spiral outlet, a bearing housing, a rotor including a shaft, an impeller cantileverly mounted on it, which is a conical sleeve with screw blades. The pump provides for the unloading of the rotor from axial force, which is due to the device under the sleeve of the discharge chamber, separated from the high-pressure cavity from the side of the wheel exit by a hydrodynamic impeller seal. In the discharge chamber, a pressure is approximately equal to the input value due to the discharge of leakage to the inlet through the through holes made in the auger bushing. The rotor rotates in rolling bearings. The bearings are mounted in a bearing housing fixed in a spiral bend using a flange connection. The separation of the bearing cavity from the discharge cavity is carried out by a seal consisting of rubber cuffs (RF Patent No. 21585835, IPC F04D 3/02, published on 08.27.1999).

The disadvantage of such seals is their low reliability. Such unreliable protection of bearings against the flow of pumped liquid leads to the following negative phenomena:

a) limiting the use of pumps, as in accordance with the requirements of the Safety Rules, oil products and other chemically active liquids cannot be pumped with pumps with this type of seal;

b) possible leakage of fluid into the bearing cavity at high loading parameters and peripheral rotor speed, especially at elevated temperature of the pumped liquid, which causes leaching of the grease and, as a consequence, the destruction of the bearings.

The closest technical solution, the prototype is a sedimentary screw pump containing a housing with an axial inlet and a spiral outlet. A rotor including a shaft, with a cantilever mounted impeller made in the form of a screw with screw blades, mounted in bearings that are mounted in the housing of bearing bearings, the bearing on the side of the impeller being isolated from the discharge chamber by means of a seal. The face seal is made of salicylic graphite or ceramic in the form of two rings forming a friction pair, one of which is installed in the bearing housing and the other on the shaft with the possibility of preloading it with a spring, the bearing housing has an annular cavity connected on one side by radial channels with a sealing zone, and on the other hand through a pipeline with a spiral outlet (RF Patent No. 38858 U1, IPC F04D 3/02, published July 10, 2004).

The disadvantage of this solution is also the unreliable protection of the bearings against fluid flow.

The objective of the proposed utility model is to increase the reliability and durability of the pump, expand the temperature range of the pumped liquid, as well as increase the possibility of using axial-diagonal pumps when pumping flammable liquids (flammable liquids), as well as chemically active liquids through the use of an advanced sealing system.

The technical result of the task is solved by creating a construction of an axial-diagonal pump containing a housing with an axial inlet and a spiral outlet, a rotor including a shaft on which an impeller is mounted, made in the form of a screw with screw blades, mounted in bearings that are mounted in the housing of bearing bearings where, on the side of the impeller, the bearing cavity is isolated from the discharge chamber by means of a seal, which according to the invention is made end-face in the form of a pair of eniya rings, one ring mounted in housing bearings and the other, a biasing spring on the shaft. The seal has an additional level of protection, made in the form of a cuff installed behind a pair of friction.

O-rings can be made of silicon carbide.

Thanks to the introduction of new features, namely an additional stage of protection in the form of a cuff, as well as rings made of silicon carbide, reliable protection of bearings from the flow of pumped liquid from the discharge chamber is provided.

Application of new features:

- increases the durability of this seal, increases its service life, and, consequently, the life of the pump as a whole;

- expands the temperature range of the pumped liquid;

- increases the possibility of using sedimentary pumps for pumping petroleum products, chemically active liquids, as well as their use in the nuclear industry.

The above distinguishing features are new in comparison with the prototype, so the utility model meets the criterion of "novelty."

This technical solution can be reproduced industrially, therefore, it meets the criterion of "industrial applicability".

The essence of the utility model is illustrated by drawings, where:

in FIG. 1, 2 are longitudinal sections of pumps.

in FIG. 3 shows a node A - mechanical seal in an enlarged view.

The axial screw pump of FIG. 1 comprises a housing 1 with an axial inlet 2 and a spiral outlet 3, a rotor 4, including a shaft 5 with an impeller 6 console mounted thereon, made in the form of a screw with screw blades. The shaft 5 is installed in bearings 7 and 8, which are fixed in the housing of the bearing bearings 9. Between the housing of the bearing bearings 9 and the impeller 6 there is a discharge chamber 10. The bearing 7 is isolated from the discharge chamber 10 by a mechanical seal (A).

The axial-diagonal pump shown in FIG. 2, comprises a housing 1 with an axial inlet 2, and a spiral outlet 3, a rotor 4, including a shaft 5, with an impeller 6 cantileverly mounted on it, made in the form of a screw with screw blades. The shaft 5 is installed in bearings 7 and 8, which are fixed in the housing of the bearing bearings 9.

An unloading chamber 10 is located between the bearing housing 9 and the impeller 6. The bearing 7 is isolated from the unloading chamber 10 by a mechanical seal (A).

The mechanical seal shown in FIG. 3, is a mounting block, consisting of rotating and non-rotating elements.

Rotating elements include a sleeve 11, a cage 12, springs 13 and an o-ring 14.

Non-rotating elements include a bearing housing 9, an o-ring 15 and a sleeve 16.

The rings 14 and 15, forming a friction pair, are made of silicon carbide or ceramic.

Cuff 16 is used to prevent the medium being sealed into the bearing, and also to prevent the bearing lubricant from entering the seal cavity.

The springs 13 provide pre-compression of the sealing rings 14 and 15.

The pumps operate as follows:

During rotation of the impeller, the fluid is sucked into the axial inlet and is pumped into a spiral outlet, receiving an increment of energy from the screw blades, moving from a smaller diameter to a larger one, increases its pressure due to an increase in the peripheral velocity of the fluid flow. The fixed sealing ring 15 and the rotating ring 14 rotating with the shaft form a friction pair. By adjusting the tension of the spring 13, the necessary mechanical tension is achieved between the sealing rings 14 and 15. The abutting surfaces of the rings 14 and 15 prevent the pumped liquid from entering the bearing cavity.

The proposed silicon carbide or ceramic seal protects the bearings against ingress of the pumped liquid.

Due to the use of such a sealing system, the reliability of the pump and its durability are increased.

There are various options for the use of mechanical seals in axial-diagonal pumps of various sizes with different technical characteristics.

The Osediagonal screw pump is indispensable for pumping complex liquids. Compared with other types of vane pumps, it has undoubted advantages. First of all, it has higher performance and suction capacity. The second significant plus is the ability to pump liquids with a high content of solids. The third indisputable advantage is energy intensity, i.e. more compact sizes and less weight. This also includes ease of use, maintenance and repair.

Claims (2)

1. An axial-diagonal screw pump, comprising a housing with an axial inlet and a spiral outlet, a rotor including a shaft with a cantilever-mounted impeller made in the form of a screw with screw blades, mounted in bearings, which are fixed in the housing of the bearing bearings, and the bearing with the side of the impeller is isolated from the unloading chamber by means of a mechanical seal, in the form of rings forming a friction pair, one of which is installed in the bearing housing and the other on the shaft with the possibility of odzhatiya its spring, characterized in that the mechanical seal is adapted to additional security step in the form of a cuff mounted behind the seal rings. 2. Osediagonal screw pump according to claim 1, characterized in that the sealing rings are made of silicon carbide.

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