Inner oil shield of nuclear turbine

Abstract

The inner oil shield of the nuclear turbine comprises an oil shield body, the oil shield body comprises an upper half oil shield body and a lower half oil shield body, and each of the upper half oil shield body and the lower half oil shield body comprises a first side wall, a second side wall and a top wall connected with one end of the first side wall and one end of the second side wall; a circle of oil blocking teeth are arranged on the inner side of the first side wall, and the oil blocking teeth have protruding amount relative to the inner side face of the first side wall. According to the inner oil baffle of the nuclear turbine, the problem of an original inner oil baffle is combined, an oil baffle disc and an oil baffle plate structure which are originally designed are simplified in the mode that the oil baffle teeth are arranged in an embedded mode, the inner oil baffle becomes a whole, the structural design is firm and durable, the high-temperature and high-pressure environment in the turbine can be borne, the service life of the oil baffle is prolonged, and the service life of the oil baffle is prolonged. The sealing performance of the oil shield is improved, and leakage of lubricating oil is effectively prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to nuclear power plant technical field, concretely relates to a nuclear power steam turbine inner oil baffle. BACKGROUND

[0002] The steam turbine of a certain nuclear power plant in China is HN1000-6.43 type steam turbine produced by Shanghai steam turbine plant. The bearing of the steam turbine is cylindrical bearing, the middle is split structure, the front and rear end surfaces of the bearing are provided with inner oil baffle, which is installed on both sides of the bearing, and is mainly used for preventing bearing lubricating oil from splashing along the rotor shaft to both sides, and the bearing lubricating oil is discharged to the bottom of the bearing seat through the oil baffle. The original design bearing inner oil baffle is mainly composed of two parts: oil baffle and oil baffle plate, wherein the oil baffle is combined and welded by steel plate and support column, and the oil baffle plate is made of tin brass material, which can avoid damage to the rotor caused by the oil baffle plate.

[0003] Through finite element analysis on the inner oil baffle, the maximum deformation of the original design oil baffle is about 0.011mm, the actual stiffness is low, and the deformation exists after the welding of the oil baffle plate, which leads to the deformation of the inner oil baffle during actual installation, resulting in unqualified gap adjustment.

[0004] There are the following two problems in the process of on-site equipment operation: A: the strength of the inner oil baffle is insufficient, and deformation is easily caused during installation; B: the oil baffle plate and the oil baffle plate are split type, the structure is complex, and the installation and gap adjustment of the inner oil baffle are difficult.

[0005] The original oil baffle is deformed during installation due to insufficient design strength and complex structure, the upper and lower parts of the oil baffle body are not tightly combined, which causes difficult gap adjustment of the inner oil baffle, oil leakage defect and unsatisfactory oil seal effect. If the inner oil baffle leaks oil further, it may cause lubricating oil to leak to the thermal insulation cotton or other equipment, increasing the fire hazard.

[0006] At the same time, the on-site oil baffle adjustment work period is long, and the work period cannot be shortened through process optimization and other measures. It seriously affects the safe operation of the steam turbine and the optimization of the main machine maintenance work period.

[0007] Therefore, it is necessary to design a new type of nuclear power steam turbine inner oil baffle. Utility model content

[0008] In view of the problems existing in the prior art, the utility model provides a nuclear power steam turbine inner oil baffle.

[0009] In order to achieve the above purpose, the technical scheme of the utility model is as follows: a nuclear power steam turbine inner oil baffle, comprising an oil baffle body, the oil baffle body comprises an upper half oil baffle body and a lower half oil baffle body, the upper half oil baffle body and the lower half oil baffle body both comprise a first side wall, a second side wall and a top wall connected to one end of the first side wall and the second side wall;

[0010] The inner side of the first side wall is provided with a row of oil blocking teeth, which protrude relative to the inner side of the first side wall.

[0011] Further, preferably, the joint surface between the upper half oil blocking body and the lower half oil blocking body is provided with a stop structure, which is arranged on the inner wall of one of the upper half oil blocking body and the lower half oil blocking body and protrudes relative to the joint surface of both.

[0012] Further, preferably, the stop structure is a side concave structure.

[0013] Further, preferably, the outer edge of the top wall is provided with a mounting fixed wall, and the mounting fixed wall is provided with a mounting hole.

[0014] Further, preferably, the top wall of the upper half oil blocking body is provided with at least one probe mounting hole part, and the probe mounting hole part is provided with a probe mounting hole.

[0015] Further, preferably, the probe mounting hole part is arranged symmetrically with the central axis of the upper half oil blocking body.

[0016] Further, preferably, the inner side of the first side wall is provided with a row of oil blocking teeth, which protrude relative to the inner side of the first side wall.

[0017] Further, preferably, the oil blocking teeth are copper sheets.

[0018] Further, preferably, the thickness of the first side wall and the second side wall is 7-9mm.

[0019] Further, preferably, the thickness of the top wall is 9-11mm.

[0020] Compared with the prior art, the beneficial effects of the nuclear power steam turbine inner oil blocking of the present application mainly include: in combination with the problems of the original inner oil blocking, the original oil blocking disc and oil blocking plate structure are designed as an integral mechanism, and the oil blocking effect is achieved by inlaying the oil blocking teeth, the structure design is firm and durable, can withstand the high temperature and high pressure environment inside the steam turbine, prolongs the service life of the oil blocking, improves the sealing performance of the oil blocking, and effectively prevents the leakage of lubricating oil. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0022] Figure 1 is a structural schematic view of the oil baffle in the nuclear power steam turbine in the utility model;

[0023] Figure 2 is Figure 1 an explosion schematic view;

[0024] Figure 3 is Figure 2 a local enlarged schematic view of the circle part. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0026] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications also change accordingly.

[0027] In addition, the description of "first", "second" and the like in the utility model is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0028] In the utility model, unless otherwise specifically defined and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0029] In addition, the technical solutions of various embodiments of the utility model can be combined with each other, but must be based on the realization of ordinary technical personnel in the art, when the combination of technical solutions appears mutual contradiction or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the utility model.

[0030] The utility model provides a nuclear power steam turbine inner oil baffle, as shown in the figure, including oil baffle body, the oil baffle body includes upper half oil baffle body 10 and lower half oil baffle body 20, the upper half oil baffle body 10 and the lower half oil baffle body 20 all include first side wall 30, second side wall 40 and the top wall 50 of connecting first side wall 30 and the one end of second side wall 40, such structural design makes the oil baffle body more solid durable, can bear the high temperature and high pressure environment inside steam turbine. Figures 1-3

[0031] The inboard of first side wall 30 is provided with a circle of oil baffle tooth 60, and the oil baffle tooth 60 has a convex amount relative to the inboard of first side wall 30. The setting of oil baffle tooth 60 can further improve the sealing performance of oil baffle, effectively prevent the leakage of lubricating oil, and the structure is simple.

[0032] The utility model discloses a nuclear power steam turbine inner oil baffle, which simplifies the structure of the original designed oil baffle disc and oil baffle plate by embedding oil baffle teeth, makes the inner oil baffle a whole, and is solid and durable in design, can bear the high temperature and high pressure environment inside steam turbine, improves the service life of the oil baffle, improves the sealing performance of the oil baffle, and effectively prevents the leakage of lubricating oil.

[0033] In a preferred embodiment, a combination surface between the upper half oil baffle body 10 and the lower half oil baffle body 20 is provided with a stop structure 70, the stop structure 70 is arranged on the inner wall of one of the upper half oil baffle body 10 and the lower half oil baffle body 20, and has a certain convex amount relative to the combination surface of the two. The setting of stop structure 70 makes the combination between the upper half oil baffle body 10 and the lower half oil baffle body 20 more closely, improves the sealing performance of the oil baffle, and effectively prevents the leakage of lubricating oil.

[0034] In a preferred embodiment, the stop structure 70 is a side concave structure. The stop structure 70 of the side concave structure can better realize the close combination between the upper half oil baffle body 10 and the lower half oil baffle body 20, and improve the sealing performance of the oil baffle.

[0035] In a preferred embodiment, a mounting fixed wall 80 is arranged on the outer edge of the top wall 50, and a mounting hole 81 is arranged on the mounting fixed wall 80. The setting of the mounting fixed wall 80 and the mounting hole 81 facilitates the mounting and fixing of the oil baffle body.

[0036] ​In a preferred embodiment, at least one probe mounting hole member 90 is arranged on the top wall 50 of the upper half oil baffle 10, and the probe mounting hole member 90 is provided with a probe mounting hole 91. The arrangement of the probe mounting hole member 90 and the probe mounting hole 91 enables the installation of a probe on the oil baffle for monitoring the working state of the oil baffle and the leakage of the lubricating oil, thereby improving the operation safety of the nuclear steam turbine.

[0037] In a preferred embodiment, two probe mounting hole members 90 are arranged on the center axis of the upper half oil baffle 10. Such an arrangement can ensure that the monitoring range of the probe covers the entire oil baffle, thereby improving the accuracy and reliability of the monitoring.

[0038] In a preferred embodiment, the oil baffle tooth 60 is a copper sheet. The copper sheet has good elasticity and wear resistance, and can ensure that the oil baffle tooth 60 maintains effective sealing effect for a long time.

[0039] In a preferred embodiment, the thickness of the first side wall 30 and the second side wall 40 is 7-9mm. Such a thickness design can ensure that the oil baffle has sufficient strength and rigidity, and can withstand the high temperature and high pressure environment inside the steam turbine. The deformation of the new type of inner oil baffle is greatly reduced after increasing the strength, thereby increasing the strength of the oil baffle.

[0040] In a preferred embodiment, the thickness of the top wall 50 is 9-11mm. The thickness design of the top wall 50 can ensure that the oil baffle has sufficient stability and reliability when being installed and fixed. The deformation of the new type of inner oil baffle is greatly reduced after increasing the strength, thereby increasing the strength of the oil baffle.

[0041] In a specific embodiment, the thickness of the top wall 50 of the inner oil baffle of the utility model is changed from 2mm to 10mm, and the thickness of the first side wall 30 and the second side wall 40 is changed from 4mm to 8mm on the basis of the original oil baffle. While increasing the thickness, the split structure of the oil baffle disc and the oil baffle plate is designed as an integrated structure. Modeling calculation analysis shows that the overall deformation of the new type of inner oil baffle is reduced to 0.004288mm. The new type of inner oil baffle is redesigned, and while increasing the thickness, the influence of the vibration of the unit is ensured. The first order frequency of the inner oil baffle of the utility model is 315.41Hz, which is much larger than the working frequency of the unit, and is basically consistent with the first order frequency of the original type of inner oil baffle 316.9Hz.

[0042] The internal oil baffle of this utility model was first implemented and verified during a major overhaul at a nuclear power plant in China, with good results. On-site installation and clearance adjustment are convenient. The time required for a single oil baffle from installation to clearance adjustment is approximately 1.5 hours, while the original model internal oil baffle required at least 6 hours. This significantly shortens maintenance time. Furthermore, during the GGR oil flushing during the overhaul, no oil leakage was observed at the split surface of the oil baffle, and there was no dynamic or static rubbing during unit startup and grid connection. This solves the safety hazard of oil leakage from the bearing oil baffle and improves the reliability of turbine safe operation. Through on-site practical verification, the internal oil baffle of this utility model has achieved the expected results. On-site installation and clearance adjustment are convenient. The time required for a single oil baffle from installation to clearance adjustment is approximately 1.5 hours, saving approximately 4.5 hours compared to the original model internal oil baffle. With 12 internal oil baffles installed on a single turbine, a total of approximately 54 hours of maintenance time can be saved, improving the safety and reliability of the unit. The new internal oil baffle, through structural optimization and strength improvement, significantly reduces deformation during installation, avoiding the risk of fire caused by oil leakage and resolving oil leakage defects and hidden dangers. This greatly improves the safety and reliability of the unit.

[0043] Through the above technical solution, the internal oil baffle of the nuclear power turbine of this utility model has the following advantages:

[0044] 1. The original oil baffle and oil baffle plate structure has been redesigned into an integrated structure, increasing the strength and stability of the equipment and facilitating the installation and clearance adjustment of the equipment.

[0045] 2. The stop structure makes the fit between the upper and lower oil baffles tighter, improving the sealing performance of the oil baffle and effectively preventing lubricating oil leakage.

[0046] 3. The oil baffle body has a robust and durable structural design, which can withstand the high temperature and high pressure environment inside the steam turbine, thus improving the service life of the oil baffle.

[0047] 4. The design of the probe mounting holes and probe mounting positions allows for the installation of probes on the oil baffle body to monitor the working status of the oil baffle and the leakage of lubricating oil, thereby improving the operational safety of the nuclear power turbine.

[0048] 5. The oil baffle teeth further improve the sealing performance of the oil baffle, ensuring the normal operation of the nuclear power turbine.

[0049] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An oil dam for a nuclear steam turbine, characterized by The oil baffle comprises an upper half oil baffle and a lower half oil baffle, each of which comprises a first side wall, a second side wall and a top wall connecting one end of the first side wall and the second side wall; The inner side of the first side wall is provided with a row of oil baffle teeth, which have a convex amount relative to the inner side of the first side wall.

2. The nuclear steam turbine inner oil dam as claimed in claim 1, characterized in that, The joint surface between the upper half oil baffle and the lower half oil baffle is provided with a stop structure, which is arranged on the inner wall of one of the upper half oil baffle and the lower half oil baffle and has a certain convex amount relative to the joint surface of both.

3. The nuclear steam turbine inner oil dam as claimed in claim 2, wherein The stop structure is a side concave structure.

4. The nuclear steam turbine inner oil damper of claim 1, wherein, An installation fixing wall is arranged on the outer edge of the top wall, and a mounting hole is formed in the installation fixing wall.

5. The nuclear steam turbine inner oil damper of claim 1, wherein, At least one probe mounting hole part is arranged on the top wall of the upper half oil baffle, and the probe mounting hole part is provided with a probe mounting hole position.

6. The nuclear steam turbine inner oil dam as claimed in claim 5, wherein, The probe mounting hole part is symmetrically arranged on two sides of the central axis of the upper half oil baffle.

7. The nuclear steam turbine inner oil dam as claimed in claim 1, wherein The oil baffle teeth are copper sheets.

8. The nuclear steam turbine inner oil dam as claimed in claim 1, wherein The thickness of the first side wall and the second side wall is 7-9mm.

9. The nuclear steam turbine inner oil dam as claimed in claim 1, wherein The thickness of the top wall is 9-11mm.

Images