阅读说明：本技术 核电站电动执行器防渗漏及内部流体喷溅呼吸阀转接装置 (Nuclear power station electric actuator anti-leakage and internal fluid splashing breather valve switching device ) 是由 姚伟奇 何璨祯 张晓峰 李建田 吴磊 郑晓峰 姜粝轩 曹珈铭 于 2020-12-25 设计创作，主要内容包括：本发明属于核电站电动执行器检修技术领域,具体涉及一种核电站电动执行器防渗漏及内部流体喷溅呼吸阀转接装置。本发明中,第1级防飞溅底座与电动执行器箱体连接,第2级防飞溅过滤隔板转接与第1级防飞溅底座连接,呼吸阀安装底座与第2级防飞溅过滤隔板转接连接,呼吸阀安装在呼吸阀安装底座上,第4级溢流收集槽通过螺纹与呼吸阀安装底座连接,第5级防尘防液体飞溅盖通过螺纹与第4级溢流收集槽连接。本发明能够有效解决呼吸阀渗油、漏油的情况,实现润滑油和空气的分离,同时也能抑制电动执行器内部齿轮启动瞬间电动执行器箱体内润滑油飞溅而导致的呼吸阀内油液渗漏的情况。(The invention belongs to the technical field of maintenance of electric actuators of nuclear power plants, and particularly relates to an anti-leakage and internal fluid splashing breather valve switching device for an electric actuator of a nuclear power plant. According to the invention, a 1 st-stage anti-splash base is connected with a box body of an electric actuator, a 2 nd-stage anti-splash filtering partition plate is connected with the 1 st-stage anti-splash base in a switching manner, a breather valve mounting base is connected with the 2 nd-stage anti-splash filtering partition plate in a switching manner, a breather valve is mounted on the breather valve mounting base, a 4 th-stage overflow collecting tank is connected with the breather valve mounting base through threads, and a 5 th-stage dustproof liquid-splash-proof cover is connected with the 4 th-stage overflow collecting tank through threads. The breather valve oil leakage prevention device can effectively solve the problems of oil leakage and oil leakage of the breather valve, realize the separation of lubricating oil and air, and simultaneously can inhibit the condition of oil leakage in the breather valve caused by the splashing of the lubricating oil in the box body of the electric actuator at the moment of starting the internal gear of the electric actuator.)

1. The utility model provides a nuclear power station electric actuator antiseep and inside fluid splash breather valve switching device which characterized in that: including the dustproof liquid of preventing of 5 th level lid that splashes, 4 th level overflow collecting vat, breather valve installation base, the 2 nd level is prevented splashing and is filtered the baffle switching, the 1 st level is prevented splashing the base, the breather valve, the 1 st level is prevented splashing the base and is connected with the electric actuator box, the 2 nd level is prevented splashing and is filtered the baffle switching and prevent splashing the base with the 1 st level and be connected, breather valve installation base and the 2 nd level are prevented splashing and are filtered the baffle switching and be connected, the breather valve is installed on breather valve installation base, 4 th level overflow collecting vat passes through the screw thread and is connected with breather valve installation base, the dustproof liquid of preventing of 5 th level is splashed the lid and is connected with 4 th level overflow collecting.

2. The anti-leakage and internal fluid splashing breather valve adapter device for the nuclear power plant electric actuator as claimed in claim 1, wherein: the inside of the 1 st-stage splashing prevention base is designed into a concave hollow fluctuation buffer cavity, and a vent hole is formed in the center of the bottom of the 1 st-stage splashing prevention base and used for preventing liquid from splashing at the 1 st stage.

3. The anti-leakage and internal fluid splashing breather valve adapter device for the nuclear power plant electric actuator as claimed in claim 2, wherein: the 2 nd level prevents splashing and filters the baffle switching and for the spill design, inside is hollow undulant cushion chamber, and the bottom is the inclined plane design, prevents splashing at 2 nd level and filters the baffle switching inclined plane and be provided with annular air vent with bottom surface boundary position, staggers on annular air vent and the 1 st level prevent splashing the air vent space of central point position on the base.

4. The anti-leakage and internal fluid splashing breather valve adapter device for the nuclear power plant electric actuator as claimed in claim 3, wherein: the breather valve installation base is internally of a hollow structure, the center of the upper part of the breather valve installation base is provided with a threaded hole, and the central threaded hole and the annular vent hole of the 2 nd-level anti-splash filter partition plate are staggered in space to form a 3 rd-level anti-splash function.

5. The nuclear power plant electric actuator anti-leakage and internal fluid splashing breather valve adapter device according to claim 4, characterized in that: the 4 th-stage overflow collecting tank is hollow inside and is provided with a certain overflow space capable of containing lubricating oil overflowing under extreme conditions.

6. The nuclear power plant electric actuator anti-leakage and internal fluid splashing breather valve adapter device according to claim 5, characterized in that: the center of the bottom of the 5 th-level dustproof liquid splashing prevention cover is provided with a vent hole, so that the oil splashing prevention and ventilation effects are achieved.

7. The nuclear power plant electric actuator anti-leakage and internal fluid splashing breather valve adapter device of claim 6, wherein: and thread sealant is coated at each joint to realize sealing, and the thread sealant cannot be coated at the 5 th-level dustproof liquid-splashing-prevention cover thread.

8. The nuclear power plant electric actuator anti-leakage and internal fluid splashing breather valve adapter device according to claim 7, characterized in that: the materials of all the parts are stainless steel materials.

Technical Field

The invention belongs to the technical field of maintenance of electric actuators of nuclear power plants, and particularly relates to an anti-leakage and internal fluid splashing breather valve switching device for an electric actuator of a nuclear power plant.

Background

16 main water supply regulating valves and main water supply bypass regulating valves are installed in a main water supply system of a certain nuclear power station unit, the main function of the system is to realize accurate regulation of the liquid level of a steam generator, the series of electric regulating valves have decisive contribution to unit shutdown, power reduction and the like, and the system belongs to key sensitive equipment. The temperature of main water supply is about 215 ℃ during the normal operation of the unit, the valve body is provided with a heat preservation function, the main water supply adjusting valve is provided with an electric adjusting type electric actuator, and the lubricating mode of the internal box body of the electric actuator is oil lubrication. The electric actuator designs the breather valve for preventing the overpressure of the internal cavity on the gearbox body, and the breather valve acts as: after the internal pressure of the box body reaches a certain value, the gas in the box body is discharged through the breather valve, and the internal box body is ensured to be in a normal working pressure range.

Since the unit was put into operation, electric actuator constantly appeared breather valve position oil seepage, the oil leak condition, and maintenance person need two shifts each day to wipe oil to the breather valve oil seepage position of electric head, but the valve keeps warm and still accumulates certain lubricating oil through the time of a week or so, because system temperature is higher, lubricating oil on the heat preservation has the lubricating oil on the heat preservation and smokes, smolders and the conflagration risk, needs the heat preservation of regular change.

According to the running condition of the on-site regulating valve, the regulating frequency of the main water supply regulating valve is different from 1 to 5 times per 3 minutes, the regulating valve can maintain the normal level of the liquid level of the steam generator only by accurately controlling the internal fluid, and the requirement on the performance of the electric actuator is high. The lubricating oil of the electric actuator is continuously lost to cause the oil level in the box body of the electric actuator to continuously drop (according to the measurement of the oil level on site, the most serious loss of the lubricating oil reaches the degree of 3L/6 months), and because the box body in the electric actuator is provided with a plurality of worm gears and worm screw and planetary gear transmission mechanisms, the loss of the lubricating oil seriously affects the lubrication of the gear mechanism in the electric actuator, the running quality of equipment is reduced, the risk of jamming of the electric actuator is increased, the hidden danger of great fluctuation of the liquid level of a steam generator is caused, and the risk of shutdown and shutdown is increased; meanwhile, the main water supply regulating valve electric actuator is located in a small space, and key equipment is more, so that the risk of mistakenly touching the equipment by personnel is increased by frequently performing oil wiping and valve heat-insulation replacement on the electric actuator. Therefore, the situation of oil leakage and oil leakage of the breather valve needs to be thoroughly solved.

Disclosure of Invention

The invention aims to provide a breather valve switching device for preventing leakage of an electric actuator and splashing of internal fluid of a nuclear power station, which is in modular building block design, is easy to realize processing and installation modes, can effectively solve the problems of oil leakage and oil leakage of the breather valve through the internal splash-proof structure, a fluctuation buffer chamber and other designs, realizes the separation of lubricating oil and air, and can inhibit the condition of oil leakage in the breather valve caused by the splashing of the lubricating oil in a box body of the electric actuator at the moment of starting an internal gear of the electric actuator. The invention can keep the normal working state of the internal box gear lubrication of the electric actuator, improve the stable reliability of the electric actuator of the nuclear power station, stop the fire risk and reduce the potential hidden danger of the personnel mistakenly touching the equipment.

The technical scheme adopted by the invention is as follows:

the utility model provides a nuclear power station electric actuator antiseep and inside fluid splash breather valve switching device, prevent that liquid splashes including 5 th level and cover, 4 th level overflow collecting vat, breather valve installation base, 2 nd level prevents splashing and filters the baffle switching, 1 st level prevents the base that splashes, the breather valve, 1 st level prevents that the base that splashes is connected with the electric actuator box, 2 nd level prevents splashing and filters the baffle switching and prevent the base that splashes with 1 st level and be connected, breather valve installation base prevents with 2 nd level that splashes and filters the baffle switching and be connected, the breather valve is installed on breather valve installation base, 4 th level overflow collecting vat passes through the screw thread and is connected with breather valve installation base, 5 th level prevents that liquid splashes and covers and is connected with 4 th level overflow collecting vat through the screw thread.

The inside of the 1 st-stage splashing prevention base is designed into a concave hollow fluctuation buffer cavity, and a vent hole is formed in the center of the bottom of the 1 st-stage splashing prevention base and used for preventing liquid from splashing at the 1 st stage.

The 2 nd level prevents splashing and filters the baffle switching and for the spill design, inside is hollow undulant cushion chamber, and the bottom is the inclined plane design, prevents splashing at 2 nd level and filters the baffle switching inclined plane and be provided with annular air vent with bottom surface boundary position, staggers on annular air vent and the 1 st level prevent splashing the air vent space of central point position on the base.

The breather valve installation base is internally of a hollow structure, the center of the upper part of the breather valve installation base is provided with a threaded hole, and the central threaded hole and the annular vent hole of the 2 nd-level anti-splash filter partition plate are staggered in space to form a 3 rd-level anti-splash function.

The 4 th-stage overflow collecting tank is hollow inside and is provided with a certain overflow space capable of containing lubricating oil overflowing under extreme conditions.

The center of the bottom of the 5 th-level dustproof liquid splashing prevention cover is provided with a vent hole, so that the oil splashing prevention and ventilation effects are achieved.

And thread sealant is coated at each joint to realize sealing, and the thread sealant cannot be coated at the 5 th-level dustproof liquid-splashing-prevention cover thread.

The materials of all the parts are stainless steel materials.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention provides a nuclear power station electric actuator anti-leakage and internal fluid splashing breather valve switching device which is in modular building block design, is easy to realize in processing and installation modes, can effectively solve the problems of oil leakage and oil leakage of a breather valve through the internal anti-splashing structure, a fluctuation buffer chamber and the like, realizes the separation of lubricating oil and air, and can inhibit the condition of oil leakage in the breather valve caused by the splashing of the lubricating oil in a box body of the electric actuator at the moment of starting an internal gear of the electric actuator.

(2) The invention provides a nuclear power station electric actuator anti-leakage and internal fluid splashing breather valve switching device which can keep the normal working state of the lubrication of an internal box gear of an electric actuator, improve the stability and reliability of the nuclear power station electric actuator, stop the fire risk and reduce the potential hidden danger of mistakenly touching equipment by personnel.

(3) The invention provides a nuclear power station electric actuator anti-leakage and internal fluid splashing breather valve switching device, wherein the interior of the switching device is in a labyrinth design, so that internal lubricating grease can be prevented from splashing; the oil-resistant structure is provided with a multiple redundant buffer fluctuation cavity type oil-resistant structure, and can separate oil bodies and air; the breather valve can be compatible with different types of breather valves, and the breather valve is convenient to mount and dismount; the oil collecting box is designed to take the overflow of a small amount of oil in the extreme case into consideration.

Drawings

Fig. 1 is a schematic structural view of a nuclear power plant electric actuator anti-leakage and internal fluid splashing breather valve adapter provided by the invention;

the device comprises a 1-5 th-stage dustproof and liquid splashing prevention cover, a 2-4 th-stage overflow collecting tank, a 3-breather valve installation base, a 4-2 nd-stage splashing prevention filter partition plate, a 5-1 st-stage splashing prevention base and a 6-breather valve, wherein the first stage overflow collecting tank is connected with the 1-5 th-stage dustproof and liquid splashing prevention cover through a pipeline.

Detailed Description

The anti-leakage and internal fluid splashing breather valve switching device for the electric actuator of the nuclear power plant provided by the invention is further described in detail with reference to the accompanying drawings and specific embodiments.

As shown in figure 1, the anti-leakage and internal fluid splashing breather valve switching device for the nuclear power plant electric actuator comprises a 5 th-level dustproof liquid splashing prevention cover 1, a 4 th-level overflow collecting tank 2, a breather valve installation base 3, a 2 nd-level splashing prevention filter partition plate switching device 4, a 1 st-level splashing prevention base 5 and a breather valve 6.

The 1 st-stage anti-splash base 5 is connected with the electric actuator box body through threads, the 1 st-stage anti-splash base 5 is internally designed into a concave hollow fluctuation buffer cavity, a vent hole is formed in the center of the bottom of the 1 st-stage anti-splash base, after lubricating oil formed by splashing reaches the 1 st-stage anti-splash base 5, most of the oil is blocked by the 1 st-stage anti-splash base 5, and a small amount of oil enters the internal fluctuation buffer cavity through the bottom center vent hole; a hexagonal bolt is arranged at a lug of the 1 st-stage splashing prevention base 5, and the hexagonal bolt can be fastened to an electric actuator box body through an open spanner and is used for preventing liquid splashing at the 1 st stage. During installation, the 1 st-stage anti-splash base 5 and the actuator box body can be sealed in a mode of adding a sealing copper gasket or smearing a small amount of sealing glue.

The 2 nd-stage anti-splash filtering partition plate switching device is connected with the 1 st-stage anti-splash base 5 through threads, a hexagon bolt mode is designed at the top of the 2 nd-stage anti-splash filtering partition plate switching device 4, and the 2 nd-stage anti-splash filtering partition plate switching device is fastened to the 1 st-stage anti-splash base 5 through a wrench; level 2 prevents splashing and filters baffle switching 4 and be the spill design, inside is hollow undulant cushion chamber, the bottom is the inclined plane design, level 2 of inclined plane design prevents splashing and filters baffle switching 4 and is favorable to inside fluid to level 1 and prevents splashing base 5 emission, it is provided with annular air vent to prevent splashing at level 2 simultaneously and filters 4 inclined planes of baffle switching and bottom surface boundary position, stagger on the air vent space of central point position on annular air vent and level 1 prevent splashing base 5, constitute level 2 and prevent splashing the effect, possess the oil-gas separation function simultaneously. During installation, a small amount of thread sealant is applied at the location of the threads to achieve a better seal.

The breather valve mounting base 3 is connected with the 2 nd-stage anti-splashing filtering partition plate through a screw thread and is fastened by a spanner; the breather valve installation base 3 is inside to be hollow structure, and upper portion central point puts out the screw hole, and central screw hole staggers in the space with the annular air vent of 2 nd level splash-proof filter separator switching 4, constitutes 3 rd level and prevents the effect of splashing. During installation, a small amount of thread sealant is applied at the location of the threads to achieve a better seal.

The 4 th-stage overflow collecting tank 2 is connected with a breather valve mounting base 3 through threads and is fastened by a wrench; the interior is hollow, and has certain overflow space can hold lubricating oil that overflows under the extreme condition.

The 5 th-stage dustproof and liquid splashing prevention cover 1 is connected with the 4 th-stage overflow collecting tank 2 through threads and is fastened by a wrench; the bottom center is provided with a vent hole which has the functions of preventing oil body from splashing and ventilating.

The breather valve 6 is connected with the breather valve mounting base 3 through threads.

The thread part of the 5 th-level dustproof liquid splashing prevention cover 1 cannot be coated with thread sealing glue, and the 5 th-level dustproof liquid splashing prevention cover 1 can be detached to observe whether lubricating oil is drained in the 4 th-level overflow collecting tank 2 or not in the regular or daily inspection process of equipment. Meanwhile, the central air hole in the bottom of the 4 th-stage overflow collecting tank 2 needs to be periodically checked in the inspection process, and the influence on the normal function of the device caused by the blocking of impurities or foreign matters is prevented.

The above components are made of stainless steel.

The device comprises the following installation steps:

all parts are checked to be intact before installation, no cracks, burrs, deformation and damage exist, all threads at the thread positions are intact, and foreign matters and impurities do not exist on the surfaces and inside the parts.

The method comprises the following steps: coating a small amount of thread sealant on the upper part (preventing redundant thread sealant from entering an electric actuator box body to cause lubricating oil pollution or foreign matters) of the 1 st-stage anti-splashing base 5, screwing the electric actuator box body to be provided with the breather valve by using an open end wrench, and screwing the electric actuator box body;

step two: the 2 nd-level anti-splashing filter partition plate is connected with the upper part of the 4 nd-level anti-splashing filter partition plate (preventing redundant thread sealant from entering the box body of the electric actuator to cause lubricating oil pollution or foreign matters) through a screw thread, and then the 2 nd-level anti-splashing filter partition plate is screwed into the 1 st-level anti-splashing base 5 after a small amount of thread sealant is coated on the screw thread and is screwed;

step three: coating a small amount of thread sealant on the thread of the breather valve mounting base 3, screwing the breather valve mounting base into the 2 nd-stage anti-splashing filter partition plate adapter 4, and screwing the breather valve mounting base by using an open spanner;

step four: screwing the prepared breather valve 6 into the breather valve mounting base 3, screwing the breather valve by using an open end wrench without additional stress, preventing the breather valve from being damaged, and checking that the breather valve is kept horizontal without deflection after mounting;

step five: coating a small amount of thread sealant on the external thread position on the upper part of the mounting base 3, screwing the 4 th-stage overflow collecting tank 2 into the breather valve mounting base 3, and then fastening;

step six: screwing in and fastening the 5 th-stage dustproof and liquid-splashing-preventing cover 1;

step seven: and (4) checking that each connecting part has no deflection and is vertically upward, and each part cannot be contacted with a hand wheel of an electric actuator, a manual-automatic switching mechanism, a motor, a cable and the like.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the technical scope of the present invention.