阅读说明：本技术 一种水轮发电机组油槽组合密封装置 (Hydroelectric set oil groove combination sealing device ) 是由 范寿孝 霍新新 武中德 赵越 王建刚 于 2020-04-24 设计创作，主要内容包括：本发明公开一种水轮发电机组油槽组合密封装置,由端面密封装置、径向密封装置、鼓风装置、吸油雾装置组成。其特征在于：端面密封装置可借助自身重力在竖直方向移动,弥补密封齿的磨损,保证密封齿与主轴顶面始终压紧接触；径向密封装置为两腔三“爪”结构,其中上腔体与鼓风装置连通,下腔体与吸油雾装置连通,上“爪”结构、中间“爪”结构、下“爪”结构分别布置有三排、两排、一排密封材料,密封材料布置数量代表通风阻力大小。通过端面密封装置与径向密封装置的组合作用,本发明能有效解决水轮发电机组轴承甩油及油雾溢出问题。(The invention discloses a combined sealing device for an oil groove of a water turbine generator set, which consists of an end face sealing device, a radial sealing device, a blowing device and an oil mist absorption device. The method is characterized in that: the end face sealing device can move in the vertical direction by means of self gravity, so that abrasion of the sealing teeth is compensated, and the sealing teeth are guaranteed to be always in pressing contact with the top face of the main shaft; the radial sealing device is a two-cavity three-claw structure, wherein the upper cavity is communicated with the air blowing device, the lower cavity is communicated with the oil mist absorption device, the upper claw structure, the middle claw structure and the lower claw structure are respectively provided with three rows, two rows and one row of sealing materials, and the arrangement number of the sealing materials represents the ventilation resistance. Through the combined action of the end face sealing device and the radial sealing device, the bearing oil throwing and oil mist overflowing problems of the water turbine generator set can be effectively solved.)

1. The utility model provides a hydroelectric set oil groove composite seal device which characterized by: the sealing device is composed of an end face sealing device (1), a circumferential sealing strip (2), an end face sealing seat (3), a radial sealing device (4), a sealing material (5), a rigid spring (6), a blower device (7), an oil mist absorbing device (8), an end face sealing device joint plate (9), a guide cylindrical pin (10), a radial sealing device joint plate (11), a radial sealing device air inlet (12), a radial sealing device oil mist outlet (13), a radial sealing device upper cavity (14) and a radial sealing device lower cavity (15), wherein the end face sealing device (1) is formed by splicing four-flap structures into a whole circle, the whole is fastened through the end face sealing device joint plate (9), two rows of sealing materials (5) are arranged at the lower end of the end face sealing device (1), the rigid spring (6) is arranged between the back of the sealing materials (5) and the end face sealing device (1), four guide cylindrical pins (10) are uniformly distributed in the circumferential direction of an end face sealing device (1) and connected with an end face sealing seat (3) through the guide cylindrical pins (10), a circumferential sealing strip (2) is installed in the circumferential direction of the end face sealing seat (3) and is fastened with a radial sealing device (4) through bolts, the radial sealing device (4) is spliced into a whole circle by a four-petal structure and is fastened into a whole through a radial sealing device seaming plate (11), a radial sealing device air inlet (12) and a radial sealing device oil mist outlet (13) are arranged at intervals of 90 degrees, the radial sealing device (4) is of a two-cavity three-claw structure, wherein an upper cavity (14) of the radial sealing device is communicated with a blast device (7) through a radial sealing device air inlet (12), and a lower cavity (15) of the radial sealing device is communicated with an oil mist absorption device (8) through a radial sealing device oil mist outlet (13), the upper claw structure, the middle claw structure and the lower claw structure are respectively provided with three rows, two rows and one row of sealing materials (5), and rigid springs (6) are respectively arranged between the sealing materials (5) and the radial sealing devices (4).

Technical Field

The invention relates to the field of water-turbine generator set oil mist treatment, in particular to a water-turbine generator set oil groove combined sealing device.

Background

Usually, the oil groove of the water turbine generator set contains a large amount of lubricating oil, and in the running process of the water turbine generator set, the oil groove is influenced by the stirring of the rotating part and generates a large amount of high-temperature oil mist. The oil mist overflows from the clearance between the sealing device and the main shaft, and the overflowed oil mist is condensed on the surfaces of a stator and a rotor bar of the generator, so that the service life of the insulating material is shortened, and even electrical danger is caused.

At present, develop the oil mist to hydroelectric set and administer mainly starting from two aspects: on one hand, the novel sealing device is designed, and on the other hand, the purification capacity of the oil mist adsorption device is improved. The invention belongs to a novel sealing device, which has a structure similar to that of the sealing device disclosed by the patent number CN 103671922A. It should be noted that:

(1) the radial sealing device similar to the invention patent CN 103671922A is provided with a spring device at the back of the sealing material, the design purpose is to compensate the abrasion of the sealing teeth in the operation process, but the actual operation facts of a plurality of power stations prove that after the sealing material is put into operation for a period of time, the spring force action is not reliable, the pressing action is gradually lost, finally, a certain gap is formed between the sealing teeth and the main shaft, and the gap is a main cause of the oil mist problem of the hydraulic generator.

(2) In the patent "CN 103671922 a", the same number of sealing teeth are uniformly arranged in the three "claws" structure of the radial sealing device, the resistance action of the three "claws" structure to the oil mist is consistent, and when the blower device works, the wind pressure easily wraps part of the oil mist to overflow from the gap between the uppermost sealing teeth. Disclosure of Invention

The invention discloses a combined sealing device for an oil groove of a hydroelectric generating set aiming at the defects of the existing sealing device, and the technical scheme is as follows: the sealing device is composed of an end face sealing device (1), a circumferential sealing strip (2), an end face sealing seat (3), a radial sealing device (4), a sealing material (5), a rigid spring (6), a blower device (7), an oil mist absorbing device (8), an end face sealing device joint plate (9), a guide cylindrical pin (10), a radial sealing device joint plate (11), a radial sealing device air inlet (12), a radial sealing device oil mist outlet (13), a radial sealing device upper cavity (14) and a radial sealing device lower cavity (15), wherein the end face sealing device (1) is formed by splicing four-flap structures into a whole circle, the whole is fastened through the end face sealing device joint plate (9), two rows of sealing materials (5) are arranged at the lower end of the end face sealing device (1), the rigid spring (6) is arranged between the back of the sealing materials (5) and the end face sealing device (1), four guide cylindrical pins (10) are uniformly distributed in the circumferential direction of an end face sealing device (1) and connected with an end face sealing seat (3) through the guide cylindrical pins (10), a circumferential sealing strip (2) is installed in the circumferential direction of the end face sealing seat (3) and is fastened with a radial sealing device (4) through bolts, the radial sealing device (4) is spliced into a whole circle by a four-petal structure and is fastened into a whole through a radial sealing device seaming plate (11), a radial sealing device air inlet (12) and a radial sealing device oil mist outlet (13) are arranged at intervals of 90 degrees, the radial sealing device (4) is of a two-cavity three-claw structure, wherein an upper cavity (14) of the radial sealing device is communicated with a blast device (7) through a radial sealing device air inlet (12), and a lower cavity (15) of the radial sealing device is communicated with an oil mist absorption device (8) through a radial sealing device oil mist outlet (13), the upper claw structure, the middle claw structure and the lower claw structure are respectively provided with three rows, two rows and one row of sealing materials (5), and rigid springs (6) are respectively arranged between the sealing materials (5) and the radial sealing devices (4).

Principle of operation

In the initial operation stage of the unit, the abrasion amount of the sealing material 5 on the radial sealing device 4 is small. Oil mist suction device 8 is in the open mode always, the ability of induced drafting, radial seal device 4's lower "claw" structure only has one row of sealing material, the resistance that produces the oil mist circulation is less, the oil mist receives the influence of suction, most flow direction is to oil mist suction device 8, a small amount of oil mist is wrapped up in by wind and is held and spills over from middle "claw" structure, blower device 7 will continuously provide the wind pressure this moment, because last "claw" structure is three rows of sealing material, middle claw structure is two rows of sealing materials, consequently, it is far greater than middle "claw" structure to go up "claw" structure to the resistance of oil mist, blower device 7 spills over to produce airtight effect at middle "claw" structure department to the oil mist.

As the operation time of the unit is prolonged, the sealing material 5 is greatly abraded, and the actual operation experience of a plurality of power stations proves that the abrasion of the sealing material 5 cannot be effectively compensated by the elastic force of the rigid spring 6, at the moment, the comprehensive action of the air blowing device 7 and the radial sealing device 4 still can send most oil mist into the oil mist absorption device 8, but the wrapping and clamping action of the air blowing device 7 can cause a small amount of oil mist to overflow from the upper claw structure of the radial sealing device 4, the end face sealing device 1 can always keep the tight fit between the sealing material 5 and the main shaft under the action of self gravity, compensate the insufficient resilience force of the rigid spring 6 of the radial sealing device 4, and finally the oil mist is blocked in the upper claw structure cavity of the radial sealing device 4 and flows into an oil groove after being condensed into oil drops.

Technical effects

Because the oil mist equivalent weight that the oil groove produced is great, even only a small amount of oil mist overflows, still can produce great harm, so end face sealing device 1 is regarded as the last means of oil mist seal, and the effect is very important.

Compared with the traditional sealing structure, the combined sealing device has the following advantages:

(1) in the designed combined sealing device, three rows, two rows and one row of sealing materials are respectively designed in three claw structures of the radial sealing device, the more sealing materials are arranged, the larger the gas circulation resistance is, the different resistances of the three claw structures to the oil mist circulation are realized through the design scheme, and the oil mist can flow to a preset oil mist absorption device by matching with a blower device, so that the oil mist is finally purified.

(2) In the combined sealing device of design, the end face sealing device can be kept closely attached to the contact part all the time under the action of self gravity, and compared with the action of a rigid spring, the pressing and attaching action under the action of self gravity is more reliable.

(3) The combined sealing device has long service life and simple structure, prolongs the maintenance period of the water-turbine generator set, and reduces the later maintenance cost under the condition of limited cost increase.

Drawings

FIG. 1 is a schematic view of the structure of the combined sealing device of the present invention

FIG. 2 is a schematic view of the end face sealing device

FIG. 3 is a schematic view of a radial seal

FIG. 4 is a flow diagram of oil mist in a combination seal

Detailed Description

Fig. 1 shows a schematic structure of a combined sealing device, which comprises: the device comprises an end face sealing device 1, a circumferential sealing strip 2, an end face sealing seat 3, a radial sealing device 4, a sealing material 5, a rigid spring 6, an air blowing device 7, an oil mist absorption device 8, a radial sealing device upper cavity 14 and a radial sealing device lower cavity 15. Two rows of sealing materials 5 are arranged at the lower end of the end face sealing device 1, and a rigid spring 6 is installed between the back of the sealing materials 5 and the end face sealing device 1. The circumferential sealing strip 2 is installed in the circumferential direction of the end face sealing seat 3 and is fastened with the radial sealing device through bolts. The radial sealing device 4 is of a two-cavity three-claw structure, wherein an upper cavity 14 of the radial sealing device is communicated with the air blowing device 7 through an air inlet 12 of the radial sealing device, a lower cavity 15 of the radial sealing device is communicated with the oil mist absorption device 8 through an oil mist outlet 13 of the radial sealing device, three rows, two rows and one row of sealing materials 5 are respectively arranged on the upper claw structure, the middle claw structure and the lower claw structure, and rigid springs 6 are respectively arranged between the sealing materials 5 and the radial sealing device 4.

Fig. 2 shows a simplified structural diagram of the end face sealing device, in which the end face sealing device 1 is made of four-petal structures, is fastened into a whole by a joint plate 9 of the end face sealing device, and is uniformly provided with four guiding cylindrical pins 10 in the circumferential direction, and is connected with the end face sealing seat 3 by the guiding cylindrical pins 10.

As shown in fig. 3, which is a schematic view of a radial seal structure, the radial seal 4 is a full circle formed by four-lobe structures, and is fastened into a whole by a radial seal joint plate 11, and the radial seal air inlet (12) and the radial seal oil mist outlet (13) are arranged at an interval of 90 degrees.

Fig. 4 shows a flow pattern of oil mist in the combined sealing device.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.