CN213393519U

CN213393519U - Novel bearing seal

Info

Publication number: CN213393519U
Application number: CN202020795406.4U
Authority: CN
Inventors: 宫振东
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-10
Filing date: 2020-05-10
Publication date: 2021-06-08
Anticipated expiration: 2030-05-10

Abstract

A novel bearing seal is prepared by adding graphite into organic composite material as matrix, and copper and rare earth have good strength, wear resistance, corrosion resistance and toughness. Sealed one end and the end cover fixed connection of pump, a plurality of independent ring type tooth each other and every tooth in the inner chamber have the point and break the notch, have reduced the temperature and the pressure through axial lubricating oil (oil mist) and have blockked its leakage, and the improvement of toughness satisfies the great bearing seal needs of vibrations, and harmful atmosphere in the environment can not get into the bearing box of pump, improves the life and the environmental protection of bearing.

Description

Novel bearing seal

Belongs to the technical field of:

the utility model relates to a leak-free seal of pump

Technical background:

at present, all pump bearing box structures (as shown in the figure) are provided, sealing structures on two sides of the pump bearing box structures are comb-tooth-shaped sealing oil return holes, dustproof discs are arranged on the outer sides of the pump bearing box structures, and materials of the pump bearing box structures are generally tin bronze and cast iron. The radial clearance of the seal is designed to be 0.5mm, but is far larger than the size in the practical application process, lubricating oil (oil mist) can leak out under the larger clearance, field practices prove that the seal structure can still slightly leak the oil (oil mist) even if the clearance is very small, the pump can loosen the dustproof disc under the condition of long-term vibration, friction is generated between the pump shaft and the dustproof disc, the friction can generate overheating on the one hand, the inner hole of the dustproof disc is deformed, meanwhile, the contact surface of the dustproof disc and the dustproof disc is abraded, the radial clearance is further increased, convection of inner atmosphere and outer atmosphere is generated in the larger radial clearance space, the lubricating oil (oil mist) is leaked under the action of pressure difference, and meanwhile, various atmospheres in the surrounding environment including humid air, dust, acidic air and the like are sucked into the pump body through the sealed clearance under the action of centrifugal negative pressure instantaneously formed during the operation of the pump, the lubricating oil and the bearing in the pump are polluted and corroded and the bearing is abraded, the service life of the bearing of the pump is seriously influenced, and the long-term leakage of the oil mist causes great pressure on environmental protection and safe production.

The invention content is as follows: in order to overcome the problem, the utility model provides a bearing seal, adopt organic combined material as the base member, add graphite cellulose, copper and rare earth element form a combined material, and make into the inner chamber area independent separately, a plurality of ring type teeth that are parallel to each other and every tooth have the bearing seal of point break notch, the point break notch of each ring type tooth staggers each other not on same central line, each ring type intertooth space forms a plurality of ring-shaped grooves, the half-way oil return tank is originated on sealed terminal surface to the certain length of inner chamber.

The utility model discloses the technical scheme who adopts: the novel bearing seal adopts an organic composite material with certain strength, toughness and corrosion resistance as a body material, and graphite cellulose, copper and rare earth elements are added to form the composite material. The sealed inner cavity is processed with a plurality of ring-shaped teeth, each tooth is provided with a point-breaking notch, the point-breaking notches on the teeth are staggered with each other and are not on the same central line, the cross sections of the point-breaking notches are triangular, the point-breaking ring-shaped teeth are independent from each other and are not connected with each other, ring-shaped grooves are formed between the independent teeth, and the grooves are communicated with each other through the point-breaking tooth notches and are communicated with the semi-through oil return grooves. The material formed by adding graphite fiber, copper and related rare earth elements into the organic composite material has self-lubricating property and heat insulation, can reduce abrasion, and has high strength and toughness, so that the bearing seal and the pump shaft cannot be in contact abrasion due to friction under the condition of a small gap formed between the seal and the pump shaft, and the durable service life of the seal and the pump shaft is ensured. The sealed outer end face is fixedly connected with an end cover of the pump bearing box through bolts. When the outflow of the lubricating oil (oil mist) passes through the gap formed by the first seal tooth point and the pump shaft surface, the lubricating oil (oil mist) is subjected to a throttling action for the first time, the pressure of the lubricating oil (oil mist) flowing outwards when passing through a gap formed by a first sealing tooth point and the surface of the pump shaft is reduced due to the existence of the point tooth breaking groove opening, the pressure and the temperature of the flowing-out oil (oil mist) along the axial direction of the pump shaft are reduced for the first time, part of the oil (oil mist) flowing outwards enters an annular groove cavity formed between the first point tooth point and the surface of the pump shaft after passing through the gap formed by the first sealing tooth point and the surface of the pump shaft and the first point tooth breaking groove opening respectively, because the volume is suddenly increased after entering the cavity, a strong vortex is formed, so that the flow speed of the lubricating oil (oil mist) flowing outwards is greatly reduced, and the pressure of the oil (oil mist) flowing outwards is reduced before entering an axial gap formed by the seal tooth point and the surface of the pump shaft. By analogy, the leaked lubricating oil (oil mist) is subjected to throttling and expansion once when passing through one point broken tooth and an interdental cavity, the pressure and the temperature of the leaked lubricating oil (oil mist) are reduced once, the outward leakage amount is reduced continuously along with the continuous reduction of the pressure of the outward oil leakage (oil mist), the leakage pressure is reduced to zero when reaching the end cover, and the zero-leakage sealing effect of the leaked oil (oil mist) is achieved. The annular groove structures connected through the notches of the point breaking teeth and the heat insulation property of the composite material can cool and condense heated thin lubricating oil (oil mist) which is diffused outwards from the inside of the pump, the condensed lubricating oil flows back into a bearing box of the pump through a half oil return groove, the temperature of a bearing sealing inner cavity is kept constant through the cooling, the medium convection phenomenon generated by the internal and external temperature difference can not be generated, various atmospheres in the environment can not enter a radial gap between a bearing sealing tooth tip and a pump shaft due to the generation of convection and can enter the pump body through the gap with the mixing of the lubricating oil mist, the abrasion of the pump shaft and the bearing is reduced, the bearing is enabled to be always kept in a normal working state, the service life of the pump is prolonged, and the environment is protected.

The utility model has the advantages that: the bearing seal adopts an organic composite material added with graphite cellulose, copper and rare earth elements, has good use performance and manufacturing performance, and the design of a plurality of point-breaking circular ring tooth shapes enables the space of the seal inner cavity to be communicated in a nonlinear way, increases the volume of the cavity, and reduces the pressure and the flow rate of oil mist leaking along the axial diameter. The outer end of the seal can be directly fixedly connected with the end cover of the bearing box and is sleeved outside the pump shaft, a constant small gap is kept between the outer end of the seal and the pump shaft, friction is not generated, and external media can be prevented from invading lubricating oil in the pump to cause pollution. The internal and external pressure of the seal is balanced, so that environmental impurities cannot enter the pump body, the maintenance period of the pump can be prolonged, the maintenance cost is reduced, lubricating oil (oil mist) cannot diffuse into the surrounding environment of the pump, and the environment-friendly effect is achieved.

The invention will be further described with reference to the following figures and examples:

fig. 1 is a schematic structural view of a bearing seal shape.

Fig. 2 is a view showing the mounting and use of the bearing seal on the pump bearing housing.

In the figure 1, an oil return groove 1, a pump bearing sealing main body 2, an annular groove 4 of a pump bearing sealing main body 3, a point-breaking type annular tooth 5, a bearing seal and bearing box end cover bolt connecting hole.

Pump bearing housing 1, pump bearing housing 2, pump bearing 3, bearing seal 4, bearing housing end cap 5, bolt 6, and pump shaft in fig. 2.

The shape of a main body 1 of the bearing seal in the figure 1 is manufactured into a multi-point broken type circular ring tooth-shaped structure, and holes 5 which can be connected with an end cover of a pump bearing box through a plurality of bolt rods are uniformly distributed on a large-diameter cylinder. A plurality of annular grooves 3 communicated with each other are formed between annular point-breaking teeth 4 in the inner hole of the bearing seal in sequence along the direction perpendicular to a pump shaft 6, a semi-through oil return groove 1 is formed along the direction parallel to the pump shaft, and the end face of a small-diameter cylinder of the bearing seal at one end of the small-diameter cylinder ends in a certain length range of the wall of the inner hole cavity of the bearing seal along the linear direction.

In fig. 2, a pump bearing seal 3 is sleeved between a pump bearing housing 1 and a pump shaft 6, and bolts 5 are fixedly connected with corresponding threaded holes on a bearing end cover 4 of the pump bearing housing 1 through a plurality of bolt holes uniformly distributed on the bearing seal 3. The pump bearing seal 3 is made of organic composite material added with graphite cellulose, copper and rare earth and is made into a point-breaking type multi-ring-tooth-shaped structure, the thermal conductivity of the point-breaking type multi-ring-tooth-shaped structure is lower than that of a box body and a bearing end cover 4 of a pump bearing box 1, heat generated by a pump shaft in high-speed rotation is rarely transferred to the bearing box body 1 and the bearing end cover 4 through the bearing seal 3, the temperature around the pump bearing seal 3 is kept relatively constant and does not generate temperature difference, a small gap is formed between a sharp corner of the pump bearing seal 3 and the pump shaft 6, the balance of the internal and external environmental pressures of a pump around the bearing seal 3 and the convection of internal and external media generated by the temperature difference are ensured, when thin lubricating oil or oil mist in the bearing box 1 caused by high heat generated in high-speed rotation of the pump shaft 6 is diffused outwards along the gap between the pump bearing 3 and the pump shaft 6, the intercommunication ring channel cavity that many intertooth spaces formed through the broken tooth notch of point makes the oil (oil mist) that flows produce the eddy current phenomenon here, outer draining (oil mist) pressure and velocity of flow have been reduced, outer draining (oil mist) is flowed back to the centrifugal pump bearing box 1 box along half logical oil groove after being condensed in proper order, the balance of sealed inside and outside pressure and temperature makes external pollutant can not get into in the pump bearing box 1 box equally, pollute lubricating oil, cause the bearing wear damage of pump, the life of pump is prolonged, the oil mist does not outwards leak, the environmental protection has been reached.

Claims

1. A novel bearing seal is characterized in that a pump bearing seal which is made of organic composite materials and is provided with a plurality of ring-shaped teeth and each tooth is provided with a point-breaking notch is characterized in that an inner cavity of a main body of the bearing seal is made into a plurality of ring-shaped teeth and each tooth is provided with a point-breaking notch, the cross sections of the teeth are triangular, the ring-shaped teeth are parallel to each other and are independent from each other, holes which can be connected with an end cover of a pump bearing box through a plurality of bolt rods are uniformly distributed on a large-diameter cylinder, the breaking notch of the plurality of point-breaking ring-shaped teeth in the inner wall of the bearing seal are staggered from each other, on the same central line, adjacent teeth form nonlinear and mutually communicated annular grooves through the breaking notches and are sequentially distributed along the direction perpendicular to the axial direction, a semi-through oil return groove is arranged along the axial direction, and one end of the semi-through oil return groove starts from the inner, and ends in a certain length range of the cavity wall of the inner hole of the bearing seal along the linear direction.