CN2729409Y

CN2729409Y - Thrust bearing of high-speed hydroelectric generating set

Info

Publication number: CN2729409Y
Application number: CNU2004200613163U
Authority: CN
Inventors: 邹春阳; 周智勇; 何成刚
Original assignee: Sichuan Dongfeng Electric Machinery Works Co Ltd
Current assignee: DEC Dongfeng Electric Machinery Co., Ltd.
Priority date: 2004-09-21
Filing date: 2004-09-21
Publication date: 2005-09-28
Anticipated expiration: 2014-09-21

Abstract

The utility model discloses a thrust bearing of high-speed hydroelectric generating set. The outer diameter and the included angle of the bearing liner 6 can be as small as possible and is in the shape of complete trapezoid. An air supplying hole 8 is arranged on the collar 11. The inner chamber of the collar 11 is a conical cavity whose upper part is big and lower part is small and the conical degree is 1:5-1:10. A radical oil splashing hole 7 of the collar is arranged on the upper part of the interior of the collar. The oil retaining tube 2 is a double-layer oil retaining tube. An oil guiding plate is arranged between the double-layer oil retaining tube along the direction of oil circulation. A cooler oil stabling plate 1 is arranged on the upper part of the oil cooler. The cap of the oil tank is provided with an oil tank pressure stabling plate 4 and the skeletal periphery of all the components in the oil tank is curved. The advantages of the present utility model are that: the overall structure of the bearing being taken into consideration, the design of the oil passage is smooth; the agitating loss of the generator bearing is decreased; the air pressure on the oil tank side of the bearing keeps balance with the air pressure on the inner side of the collar; thus the purpose of preventing the bearing from splashing oil and oil mist is obtained.

Description

High rotating speed hydraulic generator set thrust bearing

Affiliated field

The utility model relates to a kind of dynamo bearing, particularly a kind of high rotating speed hydraulic generator set thrust bearing.

Background technique

Thrust-bearing is one of the most key vitals of hydraulic turbine generator; it is most important to the convenience of the safety reliability of unit operation and Economy and installation and maintenance; it is reported; the former Soviet Union 1956～1975 years 2 550 thrust-bearing accidents have approximately taken place during the decade, wherein about 300 accidents cause the unit emergency shutdown.The operation practice of domestic water turbine generator group shows: the accident that big-and-middle-sized hydraulic turbine generator causes because of thrust-bearing accounts for 55～70% of unit mechanical accident, especially bearing gets rid of oil, leakage of oil and mist of oil are one of problems of the headache in power station, there are some mist of oils not influence the temporary transient operation of unit, but after permanent, generator is fixed, rotor coil will be covered by oil gas, pollute, reduce the dielectric strength of coil greatly, hinder the normal heat radiation of winding, simultaneously, Ji Lei mist of oil is dispersed into the operation factory building day by day, endangered operations staff's physical and mental health, high this type of problem of rotating speed unit is more obvious.Therefore, the design of the thrust-bearing of the especially high rotating speed unit of unit just seems particularly important.

When the design of the thrust-bearing of high rotating speed unit, often the design centre was placed on the Lubrication Calculation of bearing shell in the past, by increase watt radially, circumferential size, reduce unit pressure, obtain lower bearing shell temperature rise value with expectation.Yet, analyze by a plurality of 600r/min, 750r/min unit bearing operating experience, we find: the important factor in order of in the past having ignored the high-speed bearing operation in the mentality of designing---stir loss, because the bearing shell external diameter is big, causing stirring loss sharply increases, thereby influenced the lubricated of bearing shell, made a watt temperature rise on the contrary; Simultaneously because the circumferential size of bearing shell is bigger, the deep fat of piece watt can not get sufficient cooling and just enters next piece watt before also can causing, and also makes a watt temperature exceed even well beyond design load.Analyze according to Japanese professional institution, stir loss and account for 50～70% of total losses, and rotating speed is high more, ratio is big more.In addition because the rotating speed height, bubble that the unit rotary component produced and bubble break and the mist of oil that produces all has great influence to the operation of bearing.Cross the temperature that conference makes whole oil groove and raise owing to stir loss, thereby cause watt temperature too high, simultaneously since stir a large amount of bubbles of producing also can bulk deposition, spillover finally occurs, so must reduce in the high speed unit design bearing as far as possible and stir loss,

Summary of the invention

The purpose of this utility model promptly is to overcome the shortcoming of prior art, provide a kind of and can solve the stirring loss of dynamo bearing and the high rotating speed hydraulic generator set thrust bearing that bearing gets rid of oil, mist of oil, its structure is ingenious, satisfactory for result, and appropriate design is all carried out in aspects such as the oil circuit of bearing and gas circuit.

The purpose of this utility model is achieved through the following technical solutions: high rotating speed hydraulic generator set thrust bearing is by thrust collar, bearing shell, oil groove, slide rotor, oil cooler, compositions such as retaining oil pipe, the bearing shell external diameter, angle should be as far as possible little, bearing shell is for trapezoidal entirely, it is tiling, Wa Ji faces, analyse and observe be trapezoidal, slide rotor is provided with the tonifying Qi hole, the slide rotor inner chamber is for going up little conical cavity down greatly, its tapering is 1: 5～1: 10, at the slide rotor inside front slide rotor is set and radially gets rid of oilhole, the retaining oil pipe is double-deck retaining oil pipe, between bilayer retaining oil pipe, be provided with oil guide plate along oily loop direction at interval, be provided with the cooler oil-stabilizing plate on the top of oil cooler, oil groove covers and also is provided with oil groove voltage stabilizing plate, and the periphery of all parts profiles all is an arc in the oil groove.Tonifying Qi hole that is provided with on the part of generating units slide rotor and slide rotor radially get rid of oilhole and can unite two into one, and part of generating units has oil baffle in the thrust collar arranged outside.

By top narration as can be seen, the utlity model has following advantage: from the overall structure of bearing, the oil circuit design is unimpeded, has reduced the stirring loss of dynamo bearing, the oil groove side of bearing and the air pressure balance of slide rotor inboard reach the purpose of the anti-rejection oil of bearing, mist of oil.

Description of drawings

Fig. 1 is a kind of structural representation of the utility model

Fig. 2 is the another kind of structural representation of the utility model

Fig. 3 is the structural representation of the double-deck retaining of the utility model oil pipe

Embodiment

The utility model will be further described below in conjunction with accompanying drawing: as shown in Figure 1, it is the structure of high rotating speed hydraulic generator set thrust bearing and the shared oil groove of top guide bearing, the thrust-bearing that is used for the high speed unit of small capacity more, this is simple in structure, compact, but bearing capacity is little, by thrust collar 3, bearing shell 6, oil groove 5, slide rotor 11, oil cooler 10, retaining oil pipe 2 compositions such as grade, bearing shell 6 external diameters, angle should be as far as possible little, bearing shell 6 is for trapezoidal entirely, it is tiling, Wa Ji faces, analyse and observe be trapezoidal, slide rotor is provided with tonifying Qi hole 8, radially get rid of oilhole 7 with slide rotor and unite two into one, the slide rotor inner chamber is for going up little conical cavity down greatly, and its tapering is 1: 5～1: 10, retaining oil pipe 2 is double-deck retaining oil pipe, between bilayer retaining oil pipe, be provided with oil guide plate 9 along oily loop direction at interval, as shown in Figure 3, be provided with cooler oil-stabilizing plate 1 on the top of oil cooler, oil groove covers and also is provided with oil groove voltage stabilizing plate 4, and the periphery of all parts profiles all is an arc in the oil groove.

As shown in Figure 2, thrust-bearing and top guide bearing use the structure (thrust-bearing that is used for jumbo high speed unit) of independent oil groove respectively more: this complex structure, bearing capacity is big, because thrust-bearing is above upper spider, be arranged in outside the factory building more, therefore be convenient to installation and maintenance, especially more obvious in conjunction with cooler 10 its anti-rejection oil and mist of oil effect at the oil baffle 12 and the oil-stabilizing plate 4 below the oil groove lid of thrust collar arranged outside.High rotating speed hydraulic generator set thrust bearing, by thrust collar 3, bearing shell 6, oil groove 5, slide rotor 11, oil cooler 10, retaining oil pipe 2 compositions such as grade, bearing shell 6 external diameters, angle should be as far as possible little, bearing shell 6 is for trapezoidal entirely, it is tiling, Wa Ji faces, analyse and observe be trapezoidal, slide rotor is provided with tonifying Qi hole 8, the slide rotor inner chamber is for going up little conical cavity down greatly, its tapering is 1: 5～1: 10, at the slide rotor inside front slide rotor is set and radially gets rid of oilhole 7, retaining oil pipe 2 is double-deck retaining oil pipe, between bilayer retaining oil pipe, be provided with oil guide plate 9 along oily loop direction at interval, as shown in Figure 3, be provided with cooler oil-stabilizing plate 1 on the top of oil cooler, oil groove covers and also is provided with oil groove voltage stabilizing plate 4, and the periphery of all parts profiles all is an arc in the oil groove.

In working process, should reduce the external diameter of bearing shell, the angle that reduces watt as far as possible, draw by analysis, the loss value that stirs loss is directly proportional with the biquadratic of rotary component radius, so design is in order to improve unit pressure (from the bearing roadability, the foundation of high-speed bearing oil film more easily forms, therefore its bearing capacity is better, can get bigger unit pressure during design, low speed bearing is then opposite), particularly in recent years because the promoting the use of of plastic made tile technology, for increasing the bearing shell unit pressure, dwindling the bearing shell size actual techniques is provided; Because the rotating speed height reduces oil body and can reduce bearing loss greatly, therefore, the bearing of high rotating speed unit should use low viscous 22# lubricant oil with oil; The loss that reduces each parts in the whole oil groove is another effective measures that reduce watt temperature, particularly prevent the appearance of wedge angle collision phenomenon, the periphery of all parts profiles all is an arc in the oil groove, and raising rotary component machining accuracy, so that its shape line is more reasonable, reduce the loss that oil produces when rotated; Only arranged bearing rib entad in the past on the oil groove wall, and can make oily stream have trapping phenomena and cause the deep fat dead band like this.Can avoid oily circuit dead band, reduce the wastage by setting up oil guide plate along oily loop direction; Many for ease of the oil circulation, the utility model bearing shell was designed to trapezoidal full the shape of bearing shell based on ladder type watt in the past, promptly tiling, Wa Ji face, analyse and observe be trapezoidal.

The key points in design key of gas circuit makes the air pressure balance of oil groove side and slide rotor inboard.Air chamber inboard at slide rotor and that keep off between the oil pipe is a negative pressuren zone after the unit rotation, and oil groove is a zone of positive pressure outside the pilot trench that trackslips, because pressure reduction very easily makes oil overflow from the retaining oil pipe.In order to make the gas circuit balance of 2 air chambers, by taking on slide rotor, to set up the tonifying Qi hole to eliminate the oil spilling phenomenon that pressure reduction causes; The structure of retaining oil pipe is even more important in high rotating speed unit, should keep off oil pipe by first-selected special bilayer at the high speed unit.The slide rotor inner chamber is designed to down go up little conical cavity greatly, and its tapering was generally 1: 5～1: 10; Set up above the inboard pasta of slide rotor and radially get rid of oilhole, part of generating units can will be got rid of oilhole and the tonifying Qi hole unites two into one because of reasons in structure; On cooler top (how at 20mm place below the static pasta) and be furnished with oil-stabilizing plate near the 20mm above the static pasta, its effect is that pasta will raise after the unit rotation, but the steady oil by oil-stabilizing plate, presses the oil effect, can effectively suppress the pasta rising.Simultaneously, this oil-stabilizing plate has played the effect of abolishing bubble, and reduction mist of oil, aeration are played key effect.

Claims

1, high rotating speed hydraulic generator set thrust bearing, by thrust collar (3), bearing shell (6), oil groove (5), slide rotor (11), oil cooler (10), retaining oil pipe compositions such as (2), it is characterized in that: bearing shell (6) external diameter, angle should be as far as possible little, bearing shell (6) is for trapezoidal entirely, it is tiling, Wa Ji faces, analyse and observe be trapezoidal, slide rotor (11) is provided with tonifying Qi hole (8), the slide rotor inner chamber is for going up little conical cavity down greatly, its tapering is 1: 5～1: 10, at the slide rotor inside front slide rotor is set and radially gets rid of oilhole (7), retaining oil pipe (2) is double-deck retaining oil pipe, between bilayer retaining oil pipe (2), be provided with oil guide plate (9) along oily loop direction at interval, be provided with cooler oil-stabilizing plate (1) on the top of oil cooler, oil groove covers and also is provided with oil groove voltage stabilizing plate (4), and the periphery of all parts profiles all is an arc in the oil groove.

2, high rotating speed hydraulic generator set thrust bearing according to claim 1 is characterized in that: the tonifying Qi hole (8) that is provided with on the part of generating units slide rotor is radially got rid of oilhole (7) with slide rotor and can be united two into one.

3, high rotating speed hydraulic generator set thrust bearing according to claim 1 is characterized in that: part of generating units has oil baffle (12) in thrust collar (3) arranged outside.