CN104421432A - Sealing component of electric generator at nuclear power station and sealing system - Google Patents

Abstract

The invention is applicable to the technical field of nuclear power plants, and discloses a sealing component of a generator of a nuclear power plant and a sealing system having the sealing component. The sealing component is used to prevent lubricating oil from sliding along the axial direction of the generator shaft, and includes an annular body , the annular body is spliced by several sub-arc rings, and the inner side wall of the sub-arc rings is provided with at least three oil teeth for resisting the lubricating oil from sliding, sandwiched between two adjacent oil teeth. The slow oil grooves between the teeth are used to cache part of the lubricating oil, and the oil-repellent grooves are used to guide and discharge the lubricating oil in each of the slow-oil grooves. The oil-repellent grooves are recessed in the sub-arc ring along the arc length direction end face of the arc ring. In the present invention, the number of oil teeth and slow oil grooves on a single sealing component can be more than two, thereby effectively increasing the number of oil teeth and slow oil grooves on a single sealing component, which is conducive to improving the sealing capacity of the sealing component. Oil effect, thereby effectively reducing the amount of lubricating oil entering the generator.

Description

Sealing components and sealing systems of nuclear power plant generators

technical field

The invention belongs to the technical field of nuclear power plants, and in particular relates to a sealing component of a generator of a nuclear power plant and a sealing system with the sealing component.

Background technique

The sealing system of a nuclear power plant generator generally includes a sealing shoe structure for the flow of lubricating oil to isolate the outside air from the hydrogen in the body, and an outer oil retaining structure for preventing the lubricating oil on the end cover from flowing out of the generator and an inner oil retaining structure for preventing lubricating oil on the end cover from entering the generator, the inner oil retaining structure and the outer oil retaining structure are respectively arranged on both sides of the sealing shoe structure.

The seal shoe structure is mainly used for lubricating oil to flow on it, so that on the one hand, it can prevent the hydrogen inside the generator from flowing out of the generator from the gap between the shaft and the generator cover; on the other hand, it can prevent the outside air from flowing out of the generator. The gap between the rotating shaft (generator rotating shaft) and the generator end cover enters the inside of the generator, thereby ensuring the purity of the hydrogen coolant of the generator; on the other hand, it can take away the heat generated by the sealing tile structure and the rotating shaft during operation to prevent to the cooling effect. In specific applications, it should be ensured that the lubricating oil flowing through the sealing tile structure meets the lubricating oil temperature, pressure, and flow rate required by the seal, so that the hydrogen pressure (design pressure 0.5Mpa, up to 0.6 Mpa) can be maintained at the normal value.

The inner oil retaining structure is mainly used to prevent the lubricating oil flowing out from the sealing shoe structure from entering the generator. The inner oil retaining structure generally includes an oil retaining ring and a sealing ring. The inner wall of the sealing ring is provided with two oil teeth for resisting the sliding of lubricating oil, and is sandwiched between two adjacent oil teeth for buffering. A slow oil tank for lubricating oil and an oil drain tank for dredging the lubricating oil in the slow oil tank to the oil discharge channel of the inner oil retaining ring. In specific applications, the phenomenon of oil leakage from the inner oil retaining structure (the phenomenon that lubricating oil enters the generator through the inner oil retaining structure) is common, and the continuous existence of the oil leakage phenomenon of the inner oil retaining structure has the following hazards: 1) Lubricating oil After entering between the generator shaft coil and the stator core in the form of oil droplets or oil gas, it will adhere to the coil, winding and iron core in the form of oil film. The existence of the oil film seriously affects the heat dissipation effect of the coil, winding and iron core, so that The local temperature in the generator rises, causing thermal aging of insulating parts; 2) Since the lubricating oil inevitably contains a small amount of water, and the lubricating oil has a strong affinity for oxygen, under the action of a strong electric field, the oil film oxidizes, The generated peroxide can oxidize the cellulose in the insulating material and cause embrittlement of the material, and the various acidic substances generated can increase the conductivity of the oil film and reduce the insulation level of the insulating part; 3) Oil gas and trace moisture also reduce the hydrogen purity, and has a certain corrosive effect on the surface of the equipment.

Based on the above-mentioned hazards of lubricating oil entering the generator, how to reduce the amount of lubricating oil entering the generator has always been a technical problem that relevant technical personnel need to overcome. In the prior art, in order to reduce the amount of lubricating oil entering the generator, the following technical means are mainly adopted:

One is to increase the number of sealing rings to achieve the purpose of increasing the number of oil teeth used to block the sliding of lubricating oil. However, due to the limited axial width of the inner oil retaining ring along the rotating shaft, an inner oil retaining ring At most two sealing rings can be installed on the top, so that the number of oil teeth is only four, the number of slow oil grooves is only two, the number of times of oil blocking and buffer discharge of oil can not meet the requirements of the application, therefore, other The oil blocking effect cannot meet the specified requirements;

The second is to improve the oil retaining effect by increasing the number of oil teeth used to block the lubricating oil from sliding on a single seal ring. When the oil-repelling groove of the oil groove is used, the oil teeth in the middle will be processed, so the number of oil teeth on the final processed single seal ring is only two, so the purpose of increasing the number of oil teeth and the number of slow oil grooves cannot be achieved;

The third is to set the inner oil retaining shaft section on the rotating shaft for the installation of the inner oil retaining structure and the sealing pad shaft section for the sealing pad structure installation as stepped shafts. For example, the diameter of the sealing pad shaft section is designed as Φ570mm, and the inner oil retaining The diameter of the shaft section is designed to be Φ650mm, and the shaft section of the sealing pad passes through the R angle from Φ570mm to Φ650 of the inner oil retaining shaft section. In this way, the hydrogen-side lubricating oil discharged from the sealing pad first encounters the R fillet and is thrown out, and then The sliding of lubricating oil is blocked by the sealing ring of the inner oil blocking structure, but its oil blocking effect can not meet the specified requirements.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a sealing component of a nuclear power plant generator and a sealing system with the sealing component, which aims to solve the technical problem of how to reduce the amount of lubricating oil entering the generator.

The technical solution of the present invention is: a sealing part of a generator of a nuclear power plant, which is used to prevent lubricating oil from sliding along the axial direction of the generator shaft. At least three oil teeth for resisting the sliding of lubricating oil are protruded on the inner side wall of the sub-arc ring, and a slow oil groove for buffering part of the lubricating oil and for dredging is interposed between two adjacent oil teeth. An oil-repellent groove for discharging lubricating oil in each of the slow-oil grooves is led, and the oil-repellent groove is recessed on the end surface of the sub-arc ring along the arc length direction of the sub-arc ring.

Preferably, the recessed depth of the oil-repellent groove on the end surface of the sub-arc ring is less than half of the arc length of the sub-arc ring.

Specifically, the oil-repellent groove is T-shaped, which includes a communication groove section for communicating with each of the slow oil grooves and extending from the bottom of the communication groove section along the radial direction of the annular body through the outer wall of the sub-arc ring. through the groove section.

Preferably, a plurality of the oil teeth are equidistantly arranged on the inner side wall of the sub-arc ring along the axial direction of the rotating shaft, and a slow oil groove is interposed between any two adjacent oil teeth.

The sealing part of the nuclear power generator provided by the present invention is formed by setting the annular body as splicing several sub-arc rings, and making the oil-repellent groove recessed in the arc length direction of the sub-arc rings. On the end face, since the oil-repellent groove does not run through the arc length direction of each sub-arc ring, the oil teeth in the middle (except the two oil teeth at both ends in the axial direction) remain physically connected to the sub-arc rings. When the number of oil teeth is more than two, the processing of the oil-repellent groove will not process the middle oil teeth, so that the number of oil teeth set on the sub-arc ring can be more than two, and the number of slow oil grooves can be more than one, that is, a single There can be more than two oil teeth and more than one slow oil groove on the sealing part, thereby effectively increasing the number of oil teeth and slow oil grooves on a single seal part, which is beneficial to improve the sealing oil retaining effect of the seal part.

Furthermore, the present invention also provides a sealing system for nuclear power generators, which is used to seal the fit gap between the rotating shaft of the nuclear power generator and the end cover, including being arranged between the end cover and the rotating shaft to prevent the end cover from The lubricating oil on the oil enters the inner oil retaining structure in the generator, and the inner oil retaining structure includes an inner oil retaining ring fixedly connected to the end cover and having an oil discharge channel and an inner oil retaining ring installed on the inner oil retaining ring The first sealing ring on the inner side wall; the first sealing ring adopts the above-mentioned sealing component of the nuclear power plant generator.

Preferably, there are two first sealing rings, and the two first sealing rings are arranged on the inner side wall of the inner oil retaining ring at intervals along the axial direction of the rotating shaft.

Further, on the end surface of the inner oil retaining ring facing the outer side of the generator, an oil deflecting ring for resisting and draining part of lubricating oil is also fixed.

Specifically, the oil deflecting ring is spliced by an upper half sub-ring and a lower half sub-ring, and on the end face of the upper half sub-ring facing the inner oil retaining ring, there is also a protruding feature for preventing it from being thrown to the inner oil retaining ring. The lubricating oil on the above half sub-ring drops to the half shielding ring on the rotating shaft.

Specifically, the upper half sub-ring is fixed on the inner oil retaining ring through a first fastening component, and the lower half sub-ring is fixed on the inner oil retaining ring through a second fastening component.

Preferably, the first fastening assembly includes a bolt with a nut, the upper half sub-ring is provided with a first through hole for the bolt to pass through, and the inner oil retaining ring is provided with a The first threaded hole is matched with the bolt.

Preferably, the second fastening component includes a double-ended stud and a nut, and the double-ended stud includes a middle shoulder section and a first stud section, a second stud section respectively arranged on both sides of the middle shoulder section. Two stud sections, the inner oil retaining ring is provided with a second threaded hole cooperating with the first stud section; A second through hole is provided, and the second stud segment passes through the second through hole to be threadedly connected to the nut.

Preferably, the axial width of the intermediate shoulder section is equal to the axial width of the half-shielding ring.

Preferably, the nut is a round nut, and the second fastening assembly further includes a stop washer for locking the round nut, and the stop washer is clamped between the nut and the lower half sub-ring between.

Specifically, the inner oil retaining ring is provided with an installation groove for inserting and installing the first sealing ring.

More specifically, the mounting groove is T-shaped, and the outer wall of the first sealing ring is correspondingly provided with a T-shaped mounting portion that can be inserted into the mounting groove, and the first sealing ring is locked and fixed to the mounting groove by an elastic member. in the mounting slot described above.

Specifically, one end of the elastic member is fixedly connected to the T-shaped installation portion of the first sealing ring, and the other end extends to butt against the inner wall of the installation groove.

Further, it also includes a sealing shoe structure for the flow of lubricating oil to isolate the outside air from the hydrogen in the generator, the sealing shoe structure is annular, its outer wall is fixedly connected to the end cover, and the inner wall is sleeved On the rotating shaft, an oil supply passage for lubricating oil to flow to the gap between the inner side wall and the rotating shaft is provided on the sealing shoe structure.

Specifically, the sealing shoe structure includes a sealing shoe seat fixedly connected to the end cover and having a cavity, a sealing shoe arranged in the cavity of the sealing shoe seat, and a sealing shoe for pressing and fixing the sealing shoe to the Describe the fixing plate in the cavity of the sealed tile seat.

Further, it also includes an outer oil retaining structure for preventing the lubricating oil on the end cover from flowing out of the generator, and the sealing shoe structure is arranged between the inner oil retaining structure and the outer oil retaining structure.

Specifically, the outer oil retaining structure includes an outer oil retaining ring fixedly connected to the end cover and having an oil discharge channel, and a second sealing ring installed on the inner wall of the outer oil retaining ring.

In the sealing system of a nuclear power plant generator provided by the present invention, since the first sealing ring adopts the above-mentioned sealing component, the number of oil teeth on a single first sealing ring can be set to more than two, and the number of slow oil grooves can be set to more than two One, in this way, on the one hand, it effectively increases the number of times the internal oil retaining structure blocks the axial sliding of lubricating oil, thereby improving the sealing and oil retaining effect of the internal oil retaining structure; The number of discharges increases the amount of lubricating oil that is buffered and discharged from the slow oil tank into the oil-repellent tank, thereby effectively reducing the amount of lubricating oil that slides axially along the rotating shaft, thereby reducing the amount of lubricating oil that enters the generator Purpose. The sealing system of the generator of the nuclear power plant provided by the invention effectively reduces the amount of lubricating oil entering the generator and ensures the safety and reliability of the generator of the nuclear power plant.

Description of drawings

Fig. 1 is a schematic diagram of the assembly of the inner oil retaining structure and the rotating shaft provided by the embodiment of the present invention;

Fig. 2 is a structural schematic diagram of a sealing system of a nuclear power generator provided by an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a sub-arc ring provided by an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of an oil slinger provided by an embodiment of the present invention;

Fig. 5 is a schematic structural view of a double-ended stud provided by an embodiment of the present invention;

Fig. 6 is a schematic diagram of the assembly of the sealing shoe structure and the rotating shaft provided by the embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figures 1 to 3, the sealing part of the nuclear power generator provided by the embodiment of the present invention is used to prevent lubricating oil from sliding along the axial direction of the generator shaft 2, and includes an annular body, which is composed of several sub-arc rings 120 are spliced together, and the inner wall of the sub-arc ring 120 is provided with at least three oil teeth 121 for resisting the sliding of lubricating oil at intervals, and is sandwiched between two adjacent oil teeth 121 to buffer part of the lubricating oil. Oil groove 122 and the oil-repellent groove 123 that is used to dredge and discharge lubricating oil in each slow oil groove 122, oil-repellent groove 123 is recessed in the end face of sub-arc ring 120 along the arc length direction of sub-arc ring 120 (the end face of a sub-arc ring 120 is It is the end surface that is in contact with the adjacent sub-arc ring 120). The radial direction referred to in the embodiment of the present invention refers to the diameter direction of the rotary component, and the axial direction refers to the direction of the central axis of rotation of the rotary component. In a specific application, the sealing part of the nuclear power generator provided by the embodiment of the present invention is made of a material with good wear resistance and good corrosion resistance, such as copper material. The oil-repelling groove 123 on the sub-arc ring 120 can be processed by a milling machine. During specific processing, the sub-arc ring 120 can be installed on the fixture of the milling machine, and then the oil-repelling groove 123 can be milled out along the end face of the sub-arc ring 120 with the milling cutter of the milling machine. Oil tank 123. The sealing part of the nuclear power plant generator provided by the embodiment of the present invention is formed by arranging the annular body to be spliced by several sub-arc rings 120, and making the oil-repelling groove 123 recessed in the sub-arc rings along the arc length direction of the sub-arc rings 120 On the end face of 120, since the oil-repelling groove 123 does not run through the arc length direction of each sub-arc ring 120, the oil teeth 121 in the middle (the oil teeth 121 except the two oil teeth 121 at the two ends in the axial direction) still maintain the same The sub-arc rings 120 are physically connected. When the number of oil teeth 121 is more than two, the processing of the oil-repelling groove 123 will not process the oil teeth 121 in the middle, so that the number of oil teeth 121 arranged on the sub-arc ring 120 can be more than two, and the number of slow oil grooves 122 can be reduced. More than one, that is, the number of oil teeth 121 arranged on a single sealing component can be more than two, and the number of slow oil grooves 122 can be more than one, thereby effectively increasing the number of oil teeth 121 and slow oil grooves 122 on a single sealing component, which is beneficial to improving The sealing and oil-repelling effect of the sealing parts.

Preferably, the recessed depth of the oil-repelling groove 123 on the end face of the sub-arc ring 120 is less than 1/2 of the arc length of the sub-arc ring 120, so that it can effectively ensure that the oil-repelling groove 123 does not penetrate the sub-arc ring 120 along the arc length direction, thereby The middle oiling tooth 121 can be prevented from being milled off, thereby effectively realizing the increase in the number of oiling teeth 121 and slow oil grooves 122 on a single sealing member. More preferably, the recessed depth of the oil-repellent groove 123 on the end face of the sub-arc ring 120 is less than a quarter of the arc length of the sub-arc ring 120 . More preferably, the oil-repelling groove 123 is only slightly recessed on the end face of the sub-arc ring 120, that is, the depth of the recess of the oil-repelling groove 123 is very small, so that the middle oil tooth 121 of the sub-arc ring 120 (the sub-arc ring 120 along the rotation axis 2. The oil teeth 121 except for the two oil teeth 121 at both ends in the axial direction are only hollowed out at a small section of the end. In this way, under the premise of ensuring that the lubricating oil in each slow oil groove 122 can be discharged through the oil-repelling groove 123, The design and processing process of the oil-repelling groove 123 can be effectively simplified, and the stability and reliability of the middle oil tooth 121 can be ensured. In a specific application, the recessed depth of the oil-repellent groove 123 may be 10 mm or 5 mm or less.

Preferably, the sub-arc rings 120 spliced into the sealing component have the same structural shape and size, that is, parameters such as arc length, inner ring radius, and outer ring radius of each sub-arc ring 120 are equal. Preferably, the sealing component is formed by splicing twelve identical sub-arc rings 120 . Of course, the number of the sub-arc rings 120 spliced into the sealing part can also be other values, and in specific applications, the optimal design can be carried out according to specific processing costs and the like.

Specifically, as shown in Figures 1 and 3, the oil-repellent groove 123 is T-shaped, which includes a communication groove segment 1231 for communicating with each slow oil groove 122 and extending from the bottom of the communication groove segment 1231 along the radial direction of the annular body through the sub-arc. The through groove section 1232 of the outer wall of the ring 120 . The width of the connecting slot section 1231 along the axial direction of the rotating shaft 2 is greater than the width of the through slot section 1232 along the axial direction of the rotating shaft 2 . The width of the connecting groove section 1231 along the axial direction of the rotating shaft 2 should be designed to be large enough to ensure that the connecting groove section 1231 can communicate with each slow oil groove 122 on the same sub-arc ring 120, and then make each slow oil groove 122 on the same sub arc ring 120 All lubricating oil can flow into the connecting groove section 1231 of the sub-arc ring 120; and the design of the through groove section 1232 only needs to ensure that the through groove section 1232 communicates with the communicating groove section 1231 and extends through the outer side wall of the sub-arc ring 120 Therefore, the width of the through groove section 1232 along the axial direction of the rotating shaft 2 is designed to be smaller than the width of the connecting groove section 1231 along the axial direction of the rotating shaft 2. In this way, the machining process of the through groove section 1232 can be effectively simplified and the machining efficiency can be improved.

Preferably, as shown in Figures 1 to 3, the number of oil teeth 121 provided on each sub-arc ring 120 is five, the number of slow oil grooves 122 provided on each sub-arc ring 120 is four, and five oil teeth 121 It is arranged on the inner side wall of the sub-arc ring 120 at equal intervals along the axial direction of the rotating shaft 2 , and a slow oil groove 122 is interposed between any two adjacent oil teeth 121 . In this way, the number of oil teeth 121 and the number of slow oil grooves 122 on a single sealing part are greatly increased, thereby greatly increasing the number of times the sealing part blocks the lubricating oil flowing through it and the number of buffer discharges, and then greatly reduces the lubrication at the sealing part of the sealing part. The amount of oil leakage effectively ensures the stable and reliable operation of the generator and its safety and reliability. Of course, under the premise of not exceeding the width of the sealing component along the axial direction of the rotating shaft 2, the number of oil teeth 121 on a single sealing component can also be other values, such as three or four or six or seven, etc., specifically In the application, the optimized design can be carried out according to the specific needs and design and processing costs.

Further, the embodiment of the present invention also provides a nuclear power generator sealing system, which is used to seal the fit gap between the nuclear power generator rotating shaft 2 and the end cover 5, including being arranged between the end cover 5 and the rotating shaft 2 to prevent The lubricating oil on the end cover 5 enters the inner oil retaining structure 1 in the generator, and the inner oil retaining structure 1 includes an inner oil retaining ring 11 fixedly connected to the end cover 5 and having an oil discharge channel and an inner oil retaining ring 11 installed on the inner oil retaining ring 11 The first sealing ring 12 on the inner side wall; the first sealing ring 12 adopts the above-mentioned sealing component of the nuclear power plant generator. Since the first sealing ring 12 has adopted the above-mentioned sealing components, the number of oil teeth 121 on a single first sealing ring 12 can be set to more than two, and the number of slow oil grooves 122 can be set to more than one. Like this, on the one hand, it is effective The number of times the internal oil retaining structure 1 blocks the axial sliding of lubricating oil is increased, thereby improving the sealing and oil retaining effect of the internal oil retaining structure 1; The amount of lubricating oil buffered and discharged into the oil-repelling groove 123 from the slow oil groove 122 is increased, thereby effectively reducing the amount of lubricating oil sliding along the axial direction of the rotating shaft 2, thereby achieving the purpose of reducing the amount of lubricating oil entering the generator . The sealing system of the generator of the nuclear power plant provided by the invention effectively reduces the amount of lubricating oil entering the generator, and ensures the stable reliability and safety reliability of the generator of the nuclear power plant.

Preferably, as shown in FIGS. 1 and 2 , two first seal rings 12 are provided on the inner wall of an inner oil retaining ring 11 , and the two first seal rings 12 are spaced between the inner oil seal ring 12 along the axial direction of the rotating shaft 2 . On the inner wall of the retaining ring 11. It can be understood that by increasing the number of oil teeth 121 and slow oil grooves 122 on the single first sealing ring 12, the number of times of blocking and dredging and discharging of lubricating oil sliding along the axial direction of the rotating shaft 2 can be increased. However, when the single first seal ring 12 When there are too many oil teeth 121 and slow oil grooves 122 on the sealing ring 12 , the design and processing process of the first sealing ring 12 will be complicated, thereby increasing the difficulty of processing and manufacturing the first sealing ring 12 . In this embodiment, two first sealing rings 12 are provided. On the one hand, the number of oil teeth 121 and slow oil grooves 122 in the inner oil retaining structure 1 can be effectively increased, thereby increasing the number of lubricating oil in the inner oil retaining structure 1 along the axial direction of the rotating shaft 2. The number of blocking times and dredging discharge times of sliding can effectively reduce the amount of lubricating oil entering the generator from the inner oil retaining structure 1; The number of oil teeth 121 and slow oil grooves 122 of a single first seal ring 12 are too many to cause the structure of a single first seal ring 12 to be too complicated, which is beneficial to the design and processing of the first seal ring 12; The rotating shaft 2 floats, so the first sealing ring 12 is set to two, which can make the radial floating range of different oil teeth 121 on the two first sealing rings 12 differ to some extent (the radial direction of one first sealing ring 12 The floating is large, and the radial floating of the other first sealing ring 12 is small), which in turn helps to improve the effect of the inner oil retaining structure 1 on the lubricating oil sliding along the axial direction of the rotating shaft 2. Of course, only one first sealing ring 12 may be provided, or more than two first sealing rings 12 may be provided, such as three, if the width of the inner oil retaining ring 11 is sufficiently large.

Specifically, as shown in FIGS. 1 to 3 , the inner oil retaining ring 11 is provided with an installation groove 111 for inserting and installing the first sealing ring 12 . Preferably, the mounting groove 111 is T-shaped, and the outer wall of the first sealing ring 12 is correspondingly provided with a T-shaped mounting portion 124 that can be inserted into the mounting groove 111, and the first sealing ring 12 is locked and fixed by an elastic member (not shown in the figure). in the mounting groove 111. The inner oil retaining ring 11 is spliced by two half-ring retaining rings (not shown in the figure) to form an integral ring-shaped part. The sub-arc ring 120 can be inserted and installed on the In the installation groove 111 of the inner oil retaining ring 11. The radial height (along the diameter direction of the inner oil retaining ring 11) of the T-shaped installation groove 111 is greater than the radial height (along the diameter direction of the first seal ring 12) of the T-shaped installation part 124, so that the first seal can be After the ring 12 is installed on the inner oil retaining ring 11, a certain radial float can be generated. The T-shaped installation part 124 of the first sealing ring 12 can be pressed into the T-shaped installation groove 111 of the inner oil retaining ring 11 through the elastic member, and when the shaft 2 runs out radially, the first sealing ring 12 can follow the Floating according to the beating of the rotating shaft 2 , thereby effectively preventing the oil teeth 121 of the first sealing ring 12 from scratching the surface of the rotating shaft 2 or the rotating shaft 2 from scratching or breaking the oil teeth 121 of the first sealing ring 12 .

Specifically, one end of the elastic member is fixedly connected to the T-shaped installation portion 124 of the first sealing ring 12 , and the other end extends against the inner wall of the installation groove 111 . In a specific application, the elastic member can be a shrapnel or a spring.

Further, as shown in FIG. 1 and FIG. 2 , on the end face of the inner oil retaining ring 11 facing the outer side of the generator, an oil deflecting ring 13 for resisting and draining part of lubricating oil is also fixed. The oil deflector ring 13 can be made of aluminum. By adding an oil deflecting ring 13 on the end surface of the inner oil retaining ring 11 facing the outer side of the generator, the amount of lubricating oil entering the gap between the oil gear 121 and the rotating shaft 2 can be effectively reduced, thereby effectively reducing the lubricating oil entering the generator. amount of oil.

Specifically, as shown in Figures 1 and 4, the oil deflector ring 13 is formed by splicing an upper half subring 131 and a lower half subring 132. A semi-shielding ring 14 for preventing the lubricating oil thrown onto the upper half sub-ring 131 from dripping onto the rotating shaft 2 is convexly provided. After the upper half sub-ring 131 and the lower half sub-ring 132 are installed on the inner oil retaining ring 11, they can form a complete annular oil retaining ring 13, and the upper half sub-ring 131 is located above the shaft center of the rotating shaft 2, and the lower half The sub-ring 132 is located below the axis of the rotating shaft 2 . The semi-shielding ring 14 can be designed and processed integrally with the upper half sub-ring 131; the semi-shielding ring 14 and the upper half sub-ring 131 can also be divided into two independent parts, designed and processed separately, and then connected together by welding. The setting of the semi-shielding ring 14, on the one hand, can form a certain gap between the upper half sub-ring 131 and the inner oil retaining ring 11, thereby facilitating part of the lubricating oil to enter the gap for discharge; on the other hand, due to the semi-shielding ring 14 is a continuous semi-ring body, that is, the gap between the upper half sub-ring 131 and the inner oil retaining ring 11 is closed, so that the lubricating oil dripping into the gap between the upper half sub-ring 131 and the inner oil retaining ring 11 It can only flow and drip along the top surface of the semi-shielding ring 14, thereby preventing the lubricating oil thrown from the rotating shaft 2 into the gap between the upper half sub-ring 131 and the inner oil retaining ring 11 from directly dripping onto the rotating shaft 2 , thereby reducing the amount of lubricating oil sliding axially inwardly along the shaft 2 to the oil retaining structure 1 .

Preferably, the inner wall edges of the upper half sub-ring 131 and the lower half sub-ring 132 are all smooth arc segments processed by crimping or rounding, so that when the rotating shaft 2 vibrates, even if the rotating shaft 2 touches the upper The inner wall of the half sub-ring 131 and the lower half sub-ring 132 , the rotating shaft 2 will not be scratched by the inner wall edges of the upper half sub-ring 131 and the lower half sub-ring 132 . More preferably, a distance of at least 0.5 mm is provided between the inner wall edges of the upper half sub-ring 131 and the lower half sub-ring 132 and the rotating shaft 2 .

Specifically, as shown in FIG. 1 , the upper half sub-ring 131 is fixed on the inner oil retaining ring 11 through the first fastening assembly 15 , and the lower half sub-ring 132 is fixed on the inner oil retaining ring through the second fastening assembly 16 11 on. The upper half sub-ring 131 and the lower half sub-ring 132 are installed and fixed on the inner oil retaining ring 11 respectively. The first fastening assembly 15 and the second fastening assembly 16 are all provided with a plurality, and a plurality of first fastening assemblies 15 and a plurality of second fastening assemblies 16 are evenly and equidistantly distributed along the circumferential direction, so that The first fastening component 15 and the second fastening component 16 are stressed evenly.

Specifically, as shown in Figures 1 and 4, the first fastening assembly 15 includes a bolt 151 with a nut, the upper half sub-ring 131 is penetrated with a first through hole 141 for the bolt 151 to pass through, and the inner oil retainer The retaining ring 11 is provided with a first threaded hole cooperating with the bolt 151 . During specific installation, the bolt 151 passes through the first through hole 141 and is screwed into the first threaded hole, so that the upper half sub-ring 131 can be effectively locked and fixed on the inner oil retaining ring 11 .

Further, as shown in FIG. 1 , the first fastening component 15 further includes a washer 152 sandwiched between the nut and the upper half sub-ring 131 . The washer 152 is a flat washer or a combination of a flat washer and an elastic washer. The setting of the washer 152 is mainly used to expand the contact area between the nut of the bolt 151 and the upper half sub-ring 131, thereby preventing the nut from being in the upper half of the sub-ring. Press out indentation on 131.

Specifically, as shown in Fig. 1, Fig. 4 and Fig. 5, the second fastening assembly 16 includes a stud 161 and a nut 162, the stud 161 includes a middle shoulder section 1613 and is respectively arranged on the middle shoulder The first stud segment 1611 and the second stud segment 1612 on both sides of the segment 1613, the inner oil retaining ring 11 is provided with a second threaded hole cooperating with the first stud segment 1611, and the lower half sub-ring 132 runs through A second through hole 1321 is defined for passing through the second stud section 1612 , and the second stud section 1612 passes through the second through hole 1321 to be threadedly connected to the nut 162 . The setting of the middle shoulder section 1613, on the one hand, can make a certain distance between the lower half sub-ring 132 and the inner oil retaining ring 11, thereby helping to ensure that the upper half sub-ring 131 and the lower half sub-ring 132 are installed on the inner oil retaining ring. The upper and rear end faces of the retaining ring 11 are relatively flat; on the other hand, since a plurality of double-ended studs 161 are arranged at intervals, the gap between the lower half sub-ring 132 and the inner oil retaining retaining ring 11 is open, thereby The lubricating oil that is beneficial to throwing off from the rotating shaft 2 and the lubricating oil dripping along the bottom of the semi-shielding ring 14 can drip into the oil collecting pipeline of the generator from the gap between the lower half sub-ring 132 and the inner oil retaining ring 11.

Preferably, the axial width of the intermediate shoulder section 1613 is equal to the axial width of the half-shielding ring 14, so that the end faces of the upper half sub-ring 131 and the lower half sub-ring 132 after they are installed on the inner oil retaining ring 11 are relatively small. Flattening, so as to facilitate the flow from the semi-shielding ring 14 to the gap between the lower half sub-ring 132 and the inner oil retaining ring 11 .

Preferably, the nut 162 is a round nut 162 , the second fastening assembly 16 further includes a stop washer 163 for locking the round nut 162 , and the stop washer 163 is sandwiched between the nut 162 and the lower half sub-ring 132 . The cooperative arrangement of the round nut 162 and the stop washer 163 can effectively improve the fastening reliability of the round nut 162 on the second stud section 1612, thereby improving the stability of the lower half sub-ring 132 installed on the inner oil retaining ring 11. reliability.

Further, as shown in Fig. 2 and Fig. 6, the sealing system of the generator of the nuclear power plant provided by the embodiment of the present invention also includes a sealing shoe structure 33 for flowing lubricating oil to isolate the outside air from the hydrogen in the generator. Preferably, the sealing shoe structure 33 adopts a double-flow ring sealing shoe structure 33 in order to prevent the hydrogen in the generator from meeting and accumulating with the outside air. The specific working process of the double-flow ring seal shoe structure 33 is as follows: After the pressure lubricating oil enters the gap between the generator shaft 2 and the seal shoe structure 33 from different oil tanks, it is discharged to the hydrogen side and the air side in opposite directions, so that the hydrogen side (inside the generator) and the air side (outside the generator) are completely separated, thus effectively ensuring the safety and reliability of the seal.

Specifically, as shown in Figure 2 and Figure 6, the sealing shoe structure 33 is annular, its outer wall is fixedly connected to the end cover 5, the inner wall is sleeved on the rotating shaft 2, and the sealing shoe structure 33 is provided with a lubricating oil flow. The oil supply channel to the gap between its inner wall and the rotating shaft 2.

Specifically, as shown in Fig. 2 and Fig. 6, the sealing shoe structure 33 includes a sealing shoe seat 32 fixedly connected to the end cover 5 and having a cavity, a sealing shoe 31 arranged in the cavity of the sealing shoe seat 32, and a sealing shoe 31 for sealing The tile 31 is compressed and fixed on the fixing plate 33 in the concave cavity of the sealing tile seat 32 . The sealing tile seat 32 can be fixedly connected to the end cover 5 by screws, and the fixing plate 33 can be fixedly connected to the sealing tile seat 32 by screws. A shaft hole cooperating with the generator shaft 2 is opened in the middle of the sealing shoe 31 . During specific installation, the sealing shoe 31, the sealing shoe seat 32 and the retaining plate form a ring-shaped integral part, and the ring-shaped integral part is sleeved on the rotating shaft 2 of the generator through the upper shaft hole of the sealing shoe 31, and then through the supporting ring, the screw etc. The ring-shaped integral part made up of the sealing tile 31, the sealing tile seat 32 and the holding plate is locked and fixed on the generator end cover 5. Between the sealing shoe 31 and the generator shaft 2 , the tight gap between the side of the sealing shoe 31 and the sealing shoe seat 32 is used to maintain the circumferential and radial pressure oil film of the sealing shoe 31 . In order to establish a suitable pressure oil film, the radial gap between the sealing shoe 31 and the generator shaft 2 is generally set between 0.35-0.38 mm, and the axial gap between the side of the sealing shoe 31 and the sealing shoe seat 32 is generally set at 0.20 mm. ~0.26mm, in this way, the sealing shoe 31 can float radially and axially in the sealing shoe seat 32. In order to prevent the sealing shoe 31 from rotating together with the generator shaft 2, an anti-rotation pin (not shown in the figure) for limiting the rotation of the sealing shoe 31 is generally installed in the sealing shoe seat 32 .

Further, as shown in Fig. 2, the sealing system of the nuclear power plant generator provided by the embodiment of the present invention also includes an outer oil retaining structure 4 for preventing the lubricating oil on the end cover 5 from flowing out of the generator, and the sealing shoe structure 33 is set Between the inner oil retaining structure 1 and the outer oil retaining structure 4.

Specifically, as shown in FIG. 2 , the outer oil retaining structure 4 includes an outer oil retaining ring 41 fixedly connected to the end cover 5 and having an oil discharge channel, and a second sealing ring 42 installed on the inner wall of the outer oil retaining ring 41 . The setting of the second sealing ring 42 can effectively realize the radial sealing between the outer oil retaining structure 4 and the rotating shaft 2 , thereby effectively preventing the lubricating oil on the sealing shoe structure from flowing out of the generator. The setting of the outer oil retaining ring 41 is mainly used to realize the installation and fixation of the outer oil retaining structure 4 on the end cover 5 and can effectively support the second sealing ring 42 .

Specifically, as shown in Figures 1 and 2, the rotating shaft 2 of the nuclear power plant generator is a stepped shaft, and the inner oil retaining structure 1, the sealing shoe structure and the outer oil retaining structure 4 are respectively installed on three shaft sections with different diameters . For the convenience of description, the shaft section of the rotating shaft 2 installed on the inner oil retaining structure 1 is called the first shaft section 21, the shaft section of the rotating shaft 2 installed on the sealing shoe structure is called the second shaft section 22, and the shaft section installed on the outer oil retaining structure 4 is called the first shaft section 21. The shaft section of the rotating shaft 2 is called the third shaft section 23 . The two ends of the second shaft section 22 are respectively connected to the first shaft section 21 and the third shaft section 23, and the diameter of the first shaft section 21 and the diameter of the third shaft section 23 are larger than the diameter of the second shaft section 22, like this, It can prevent the lubricating oil flowing out from the sealing shoe structure from being directly thrown onto the inner oil retaining structure 1 and the outer oil retaining structure 4 . The transition of the first shaft section 21 and the second shaft section 22 is a fillet transition, like this, the transition length of the first shaft section 21 and the second shaft section 22 can be extended, and then it is beneficial to improve the speed of the first shaft section 21 and the second shaft section 22. The transition of the shaft section 22 resists the quantity of lubricating oil.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement or improvement made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (20)

1. A sealing part of a nuclear power plant generator, used to prevent lubricating oil from sliding axially along the generator shaft, comprising an annular body, characterized in that: the annular body is spliced by several sub-arc rings, the The inner side wall of the sub-arc ring is provided with at least three oil teeth for resisting the sliding of lubricating oil at intervals, and a slow oil groove for buffering part of the lubricating oil between two adjacent oil teeth and for dredging. An oil-repellent groove for discharging lubricating oil in each of the slow-oil grooves, and the oil-repellent groove is recessed on the end surface of the sub-arc ring along the arc length direction of the sub-arc ring. 2 . The sealing component of a nuclear power plant generator according to claim 1 , wherein the recessed depth of the oil-repellent groove on the end face of the sub-arc ring is less than half of the arc length of the sub-arc ring. 3 . 3. The sealing part of nuclear power plant generator as claimed in claim 1 or 2, characterized in that: said oil-repellent groove is T-shaped, and it includes a connecting groove section for communicating with each of said slow oil grooves and along said annular The body radially extends from the bottom of the communicating groove section through the through groove section on the outer sidewall of the sub-arc ring. 4. The sealing part of a nuclear power plant generator as claimed in claim 1, wherein a plurality of said oil teeth are equidistantly arranged on the inner side wall of said sub-arc ring along the axial direction of said rotating shaft, and any two One slow oil groove is interposed between the adjacent oil teeth. 5. A sealing system for a generator of a nuclear power plant, used to seal the fit gap between the rotating shaft of the generator of a nuclear power plant and the end cover, including being arranged between the end cover and the rotating shaft to prevent the lubricating oil on the end cover from entering the The internal oil retaining structure in the generator, the internal oil retaining structure includes an inner oil retaining ring fixedly connected to the end cover and having an oil discharge channel and a first oil retaining ring installed on the inner wall of the inner oil retaining ring The sealing ring, characterized in that: the first sealing ring adopts the sealing component of a nuclear power plant generator according to any one of claims 1 to 4. 6. The sealing system of a nuclear power generator generator according to claim 5, wherein there are two first sealing rings, and the two first sealing rings are spaced apart from each other along the axial direction of the rotating shaft. On the inner wall of the inner oil retaining ring. 7. The sealing system of a nuclear power plant generator according to claim 5, characterized in that: on the end face of the inner oil retaining ring facing the outer side of the generator, there is also a fixed device for resisting and draining part of the lubricating oil. oil deflector ring. 8. The sealing system of a nuclear power plant generator as claimed in claim 7, wherein the oil deflector ring is spliced by an upper half sub-ring and a lower half sub-ring, and when the upper half sub-ring faces the inner On the end face of the oil retaining ring, a semi-shielding ring for preventing the lubricating oil thrown onto the upper half sub-ring from dripping onto the rotating shaft protrudes. 9. The sealing system of a nuclear power plant generator according to claim 8, wherein the upper half sub-ring is fixed on the inner oil retaining ring through a first fastening assembly, and the lower half sub-ring is fixed on the inner oil retaining ring through a first fastening assembly. The second fastening component is fixed on the inner oil retaining ring. 10. The sealing system of nuclear power plant generator according to claim 9, characterized in that: the first fastening assembly includes a bolt with a nut, and the upper half sub-ring is penetrated with a hole for the bolt to pass through. the first through hole, and the inner oil retaining ring is provided with a first threaded hole cooperating with the bolt. 11. The sealing system of nuclear power plant generator according to claim 9, characterized in that: the second fastening assembly comprises a stud and a nut, and the stud comprises a middle shoulder section and is respectively arranged on The first stud section and the second stud section on both sides of the middle shoulder section, the inner oil retaining ring is provided with a second threaded hole cooperating with the first stud section, and the lower A second through hole for the second stud segment to pass through is opened through the half sub-ring, and the second stud segment passes through the second through hole to be threadedly connected to the nut. 12 . The sealing system of a nuclear power generator according to claim 11 , wherein the axial width of the middle shoulder section is equal to the axial width of the semi-shielding ring. 13 . 13. The sealing system of a nuclear power plant generator according to claim 11, wherein the nut is a round nut, and the second fastening assembly further includes a stop washer for locking the round nut, so The stop washer is interposed between the nut and the lower half sub-ring. 14. The sealing system of a nuclear power generator according to claim 5, wherein an installation groove for inserting and installing the first sealing ring is provided on the inner oil retaining ring. 15. The sealing system of nuclear power plant generator according to claim 14, characterized in that: the installation groove is T-shaped, and the outer wall of the first sealing ring is correspondingly provided with a T-shaped installation that can be inserted into the installation groove. part, the first sealing ring is locked and fixed in the installation groove by an elastic member. 16. The sealing system of a nuclear power generator according to claim 14, wherein one end of the elastic member is fixedly connected to the T-shaped mounting portion of the first sealing ring, and the other end extends against the installed on the inner wall of the groove. 17. The sealing system of a generator in a nuclear power plant according to claim 5, further comprising a sealing shoe structure for supplying lubricating oil to flow to isolate the outside air from the hydrogen in the generator, and the sealing shoe structure is in the form of The outer wall is fixedly connected to the end cover, the inner wall is sleeved on the rotating shaft, and the sealing shoe structure is provided with an oil supply for lubricating oil to flow to the gap between the inner wall and the rotating shaft. aisle. 18. The sealing system of a nuclear power plant generator according to claim 17, wherein the sealing shoe structure includes a sealing shoe seat fixedly connected to the end cover and having a concave cavity, and is arranged in the concave cavity of the sealing shoe seat The inner sealing shoe and the fixing plate are used to press and fix the sealing shoe in the concave cavity of the sealing shoe seat. 19. The sealing system of a nuclear power generator generator according to claim 17, further comprising an outer oil retaining structure for preventing the lubricating oil on the end cover from flowing out of the generator, and the sealing shoe structure is arranged on Between the inner oil retaining structure and the outer oil retaining structure. 20. The sealing system of a nuclear power plant generator according to claim 19, wherein the outer oil retaining structure includes an outer oil retaining ring fixedly connected to the end cover and having an oil discharge channel and mounted on the outer oil retaining ring. The second seal ring on the inside wall of the oil retaining ring.