CN111351620A - Intelligent underwater air sealing system of nuclear power plant - Google Patents
Intelligent underwater air sealing system of nuclear power plant Download PDFInfo
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- CN111351620A CN111351620A CN201811567737.6A CN201811567737A CN111351620A CN 111351620 A CN111351620 A CN 111351620A CN 201811567737 A CN201811567737 A CN 201811567737A CN 111351620 A CN111351620 A CN 111351620A
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- 238000007789 sealing Methods 0.000 title claims abstract description 62
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- 230000001105 regulatory effect Effects 0.000 claims abstract description 29
- 238000007689 inspection Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000002775 capsule Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3263—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers using a differential pressure detector
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention relates to the field of nuclear power plant maintenance, in particular to an intelligent underwater sealing system for a nuclear power plant. The larger the pressure in the underwater sealed cavity is, the higher the requirements on the wall thickness, the structure and the size of the part of the sealed cavity are, and the greater the safety risk of the sealed cavity is. The water part of the patent comprises a proportional pressure regulating valve, a control box and an air source; the underwater part comprises an underwater sealed cabin, a safety valve, a pressure sensor and an actuating element N; the proportional pressure regulating valve is electrically connected with the control box through a cable; the proportional pressure regulating valve is connected with the underwater sealed cabin through a main air pipe; the control box is connected with the underwater sealed cabin through a main cable; the underwater sealed cabin is connected with each execution element N through a gas pipe and a cable; the underwater sealed cabin is connected with the safety valve through an air pipe; the pressure sensor is connected with the underwater sealed cabin through a cable. The air source and the proportional pressure regulating valve are pneumatically connected through an air pipe. The device can automatically adjust air pressure and improve the reliability of equipment.
Description
Technical Field
The invention relates to the field of nuclear power plant maintenance, in particular to an intelligent underwater sealing system for a nuclear power plant.
Background
During the overhaul period of the nuclear power plant, various inspection devices of a primary loop need to be subjected to nondestructive inspection, and if problems exist, an underwater robot needs to be used for maintenance and treatment. Since the primary equipment is highly radioactive and is at risk of contamination, these inspection and maintenance robots need to be carried out in an aqueous environment to shield the exposure.
When the underwater inspection device and the underwater robot work underwater, measures need to be taken to carry out sealing treatment on various electrical elements of equipment, and water is guaranteed not to enter the electrical elements. The common method is to cover the electric element by mechanical parts, and because the contact surface of the parts is easy to enter water, a sealing structure needs to be processed on the contact surface of the parts, and corresponding sealing parts are placed. The sealing parts comprise static seals and dynamic seals. The static seal is used for the condition that two mutually contacted parts do not move relatively, and the seal is more reliable under the general condition. The dynamic seal is used for the condition that two mutually-contacted parts have relative motion, and in the condition, higher requirements are provided for the machining matching precision, the mounting precision and the surface roughness of the sealing parts and the mutually-contacted parts.
In the nuclear power field, very high requirements are put on the reliability of equipment, particularly underwater equipment, if an electric element leaks water, the whole equipment can be damaged, the equipment can fall to the bottom of a water pool and further damage the bottom of a container, and if the equipment fails in a main pipeline, measures must be taken to take the equipment out of the pipeline, so that the safe operation of the nuclear industry in China is seriously influenced.
In order to improve the sealing reliability of underwater equipment, the currently more common method is to introduce sealing gas with certain pressure into a sealing cavity, and simultaneously ensure that the air pressure in the sealing cavity is greater than the external water pressure of the equipment, so that water cannot enter the equipment even if the sealing condition is damaged. The deeper the operating water depth of the equipment, the higher the required seal gas pressure. The sealed cavity can be understood as a pressure container in a certain sense, the higher the internal pressure is, the higher the requirements on the wall thickness, the structure and the size of the part of the sealed cavity are, and the greater the safety risk of the sealed cavity is. Therefore, if the working water depth of the equipment is deeper, the sealing cavity parts of the equipment are often thicker and heavier, the number of connecting fasteners is large, the connecting fasteners are densely distributed, and the models are large, so that the convenience and the attractiveness of the whole equipment are affected. The conventional method has the defect of high risk of misoperation, and if the design pressure of the sealed cavity is not high, but the sealed cavity is filled with sealing gas with high pressure due to misoperation, the sealed cavity has explosion risk, and great potential safety hazard is caused to personnel and primary loop main equipment of the nuclear power plant.
The invention provides an intelligent underwater air sealing system for a nuclear power plant, which can provide reliable air sealing for various underwater inspection devices and underwater robots of a loop of the nuclear power plant, ensure that water cannot enter a sealed cavity of an electric element during underwater work, and improve the reliability of equipment. The sealing gas pressure of the sealing cavity of the equipment can be automatically adjusted along with the working water depth of the equipment, so that the internal and external pressure difference of the sealing cavity is always kept at a safe and reliable value. Therefore, the compression strength of the sealing cavity can be reduced, the structural requirement of the sealing cavity can be further reduced, and the safety and reliability can be improved.
Disclosure of Invention
1. The purpose is as follows:
the invention provides an intelligent underwater air sealing system for a nuclear power plant, which can provide reliable air sealing for various underwater inspection devices and underwater robots of a loop of the nuclear power plant, ensure that water cannot enter a sealed cavity of an electric element during underwater work, and improve the reliability of equipment. The sealing gas pressure of the sealing cavity of the equipment can be automatically adjusted along with the working water depth of the equipment, so that the internal and external pressure difference of the sealing cavity is always kept at a safe and reliable value. Therefore, the compression strength of the sealing cavity can be reduced, the structural requirement of the sealing cavity can be further reduced, and the safety and reliability can be improved.
2. The technical scheme is as follows:
an intelligent underwater gas sealing system for a nuclear power plant, comprising: an above-water part and an under-water part. The overwater portion includes: the overwater part comprises a proportional pressure regulating valve, a control box and an air source; the underwater part comprises an underwater sealed cabin, a safety valve, a pressure sensor and an actuating element N; the proportional pressure regulating valve is electrically connected with the control box through a cable; the proportional pressure regulating valve is connected with the underwater sealed cabin through a main air pipe; the control box is connected with the underwater sealed cabin through a main cable; the underwater sealed cabin is connected with each execution element N through a gas pipe and a cable; the underwater sealed cabin is connected with the safety valve through an air pipe; the pressure sensor is connected with the underwater sealed cabin through a cable. The air source and the proportional pressure regulating valve are pneumatically connected through an air pipe.
The execution element N is larger than 1 and is an integer.
The underwater sealed cabin is integrated with an underwater inspection device and an underwater element part of an underwater robot control system.
The safety valve is opened when the pressure difference between the internal pressure of the underwater sealed cabin and the external water pressure is greater than a set value.
The gas source provides gas which is dry sealing gas.
The control box transmits an electric signal to the execution element N through the main cable, the underwater sealed cabin and the sub-cable, and sends a pressure control instruction to the proportional pressure regulating valve.
3. Effect
3.1 automatic pressure adjusting air sealing method
The utility model provides a water pressure of current degree of depth can be detected through the pressure sensor on the sealed cabin under water to the intelligent airtight system under water of nuclear power plant, can the pressure of the sealed gas of automatically regulated supply, and the inside atmospheric pressure of sealed cabin under water is greater than the water pressure outside the cabin all the time, and differential pressure control is at a fixed value simultaneously.
3.2 method for guaranteeing air pressure safety of cable switching cabin
The utility model provides a nuclear power plant intelligence is airtight system under water, has installed a relief valve at the sealed cabin under water, has put through the sealed gas of a test with sealed under water during the experiment, then does the experiment in the depth of water of difference, and when the difference of the inside atmospheric pressure of sealed cabin under water and the water pressure of the depth of water at relief valve place was greater than the setting value of relief valve, the sealed gas spills over from the relief valve, has guaranteed the security of system.
Drawings
FIG. 1 is a general diagram of an intelligent underwater gas sealing system of a nuclear power plant
Detailed Description
The following detailed description of the patent refers to the accompanying drawings and specific embodiments:
as shown in fig. 1, an intelligent underwater gas sealing system for a nuclear power plant can provide reliable gas sealing for various underwater inspection devices and underwater robots in a loop of the nuclear power plant, and ensure that water cannot enter electrical elements during underwater work. The air sealing system comprises an above-water part and an under-water part. The overwater part comprises an air source, a proportional pressure regulating valve and a control box; the underwater part comprises an underwater sealed cabin, a safety valve, a pressure sensor and various actuating elements, and the underwater sealed cabin, the safety valve, the pressure sensor and the various actuating elements are connected through a main air pipe and a main cable.
Wherein, the air supply provides the whole hermetic sealing system with the sealing air subjected to the dry-noise treatment. The proportional pressure regulating valve is pneumatically connected with an air source through an air pipe, the proportional pressure regulating valve is electrically connected with the control box through a cable, a pressure regulating instruction is sent out by the control box, and the proportional pressure regulating valve is used for regulating the pressure of the sealing air. The sealed gas after pressure regulation is transmitted into an underwater sealed cabin through a main gas pipe, and the underwater sealed cabin is an underwater inspection device or an underwater part main component integration unit of an underwater robot control system. The underwater sealed cabin transmits the sealing gas to the terminal of the actuating element 1, the actuating element n and the like through the gas pipe 1, the gas pipe n and the like. The safety valve is connected with the underwater sealed cabin through an air pipe, the safety valve plays a safety role, and when the pressure difference between the internal pressure of the underwater sealed cabin and the water pressure outside the cabin is larger than a set value, the sealing air can be discharged through the safety valve. The pressure sensor is connected with the underwater sealed cabin through a cable, and the pressure sensor is used for detecting the pressure of water outside the underwater sealed cabin.
The control box is the overwater part of the underwater inspection device or the underwater robot control system and is connected with the control system part in the underwater sealed cabin through a main cable. The actuator 1, the actuator n and the pressure sensor are connected to the control system part of the underwater capsule by means of cables.
The implementation mode is as follows:
the equipment is started on the shore, the intelligent underwater air sealing system is synchronously started, the pressure value detected by the pressure sensor at the moment is atmospheric pressure, the air source starts to supply sealing air to the underwater sealed cabin through the proportional pressure regulating valve, and the control system sends a corresponding pressure control instruction to the proportional pressure regulating valve through calculation. The device is placed in water to work, the pressure sensor detects the water pressure of the current water depth at the moment, the control system automatically adjusts the control pressure of the proportional pressure regulating valve in real time, and then automatically adjusts the pressure of the supplied sealing air, so that the pressure difference between the air pressure in the underwater sealed cabin and the water pressure detected by the pressure sensor is controlled to be a reasonable value. Therefore, the whole underwater air seal can be ensured to safely and reliably operate.
The invention mainly comprises the following technologies:
the main working principle is as follows: when the intelligent underwater air sealing system of the nuclear power plant works, an underwater sealed cabin works at different underwater depths, and a pressure sensor is used for detecting the water pressure of the current depth. The shore control box transmits electric signals to different execution elements through the main cable, the underwater sealed cabin and the sub-cables. The air source transmits the sealing air to different execution units through the proportional pressure regulating valve, the main air pipe, the underwater sealed cabin and the sub air pipe to play a role in air sealing. The proportional pressure regulating valve is used for regulating the pressure of the sealing air, the set pressure value is slightly higher than the current value of the pressure sensor, the air pressure in the underwater sealed cabin is always higher than the water pressure outside the cabin, meanwhile, the pressure difference is controlled to be a reasonable value, and the control instruction of the proportional pressure regulating valve is provided by the control box. The safety valve plays a safety role, when the difference between the air pressure in the underwater sealed cabin and the water pressure of the water depth where the safety valve is located is larger than a set value of the safety valve, the sealing air overflows from the safety valve, and when the pressure difference is smaller than the set value, the safety valve stops overflowing. 1. Automatic pressure adjusting air sealing method
The utility model provides a water pressure of current degree of depth can be detected through pressure sensor on the sealed cabin under water to the intelligent airtight system under water of nuclear power plant, then the pressure of the sealed gas of automatically regulated supply, guarantees that the inside atmospheric pressure of sealed cabin under water is greater than the water pressure outside the cabin all the time, and differential pressure control is at a reasonable value simultaneously. Therefore, when the cable transfer cabin is designed, the withstand voltage value needing to be considered is lower, the structure can be optimized, and the total weight is reduced.
2. Safety guarantee method for air pressure of cable switching cabin
Although the intelligent underwater air sealing system for the nuclear power plant can ensure that the air pressure inside an underwater sealed cabin is always greater than the water pressure outside the cabin, the pressure difference is controlled to be a reasonable value. However, in case of a problem in the control system, the pressure of the sealing gas passing through the underwater seal may not be controlled, and there is a possibility that the explosion of the chamber due to the excessive pressure may occur, which may seriously threaten personnel and equipment. According to the invention, the mechanical safety valve is added in the underwater sealed cabin, when the difference between the air pressure in the underwater sealed cabin and the water pressure of the water depth where the safety valve is located is larger than the set value of the safety valve, the sealing air overflows from the safety valve, and when the differential pressure is smaller than the set value, the safety valve stops overflowing. Therefore, the pressure in the underwater sealed cabin and the external pressure are less than the set value, and the safe operation is ensured.
Claims (7)
1. An intelligent underwater gas sealing system for a nuclear power plant, comprising: the part on water, part under water, its characterized in that: the above-water part comprises: the overwater part comprises a proportional pressure regulating valve and a control box; the underwater part comprises an underwater sealed cabin, a safety valve, a pressure sensor and an actuating element N; the method is characterized in that: the proportional pressure regulating valve is electrically connected with the control box through a cable; the proportional pressure regulating valve is connected with the underwater sealed cabin through a main air pipe; the control box is connected with the underwater sealed cabin through a main cable; the underwater sealed cabin is connected with each execution element N through a gas pipe and a cable; the underwater sealed cabin is connected with the safety valve through an air pipe; the pressure sensor is connected with the underwater sealed cabin through a cable.
2. The intelligent underwater gas sealing system for the nuclear power plant as claimed in claim 1, wherein: the water part also comprises an air source, and the air source is pneumatically connected with the proportional pressure regulating valve through an air pipe.
3. The intelligent underwater gas sealing system for the nuclear power plant as claimed in claim 1, wherein: the execution element N is larger than 1 and is an integer.
4. The intelligent underwater gas sealing system for the nuclear power plant as claimed in claim 1, wherein: the underwater sealed cabin is integrated with an underwater inspection device and an underwater element part of an underwater robot control system.
5. The intelligent underwater gas sealing system for the nuclear power plant as claimed in claim 1, wherein: the safety valve is opened when the pressure difference between the internal pressure of the underwater sealed cabin and the external water pressure is greater than a set value.
6. The intelligent underwater gas sealing system for the nuclear power plant as claimed in claim 2, wherein: the gas source provides gas which is dry sealing gas.
7. The intelligent underwater gas sealing system for the nuclear power plant as claimed in claim 1, wherein: the control box transmits an electric signal to the execution element N through the main cable, the underwater sealed cabin and the sub-cable, and sends a pressure control instruction to the proportional pressure regulating valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811567737.6A CN111351620A (en) | 2018-12-21 | 2018-12-21 | Intelligent underwater air sealing system of nuclear power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811567737.6A CN111351620A (en) | 2018-12-21 | 2018-12-21 | Intelligent underwater air sealing system of nuclear power plant |
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| CN111351620A true CN111351620A (en) | 2020-06-30 |
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| CN201811567737.6A Pending CN111351620A (en) | 2018-12-21 | 2018-12-21 | Intelligent underwater air sealing system of nuclear power plant |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237611A (en) * | 2021-04-27 | 2021-08-10 | 国核工程有限公司 | Experimental isolated plant of quick isolating device under water |
| CN114001147A (en) * | 2021-11-30 | 2022-02-01 | 天津旗领机电科技有限公司 | Internal pressure monitoring and adjusting system of precision speed reducer for deepwater underwater robot |
| CN113237611B (en) * | 2021-04-27 | 2024-05-10 | 上海核工程研究设计院股份有限公司 | Experimental isolated plant of quick isolating device under water |
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2018
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| CN113237611B (en) * | 2021-04-27 | 2024-05-10 | 上海核工程研究设计院股份有限公司 | Experimental isolated plant of quick isolating device under water |
| CN114001147A (en) * | 2021-11-30 | 2022-02-01 | 天津旗领机电科技有限公司 | Internal pressure monitoring and adjusting system of precision speed reducer for deepwater underwater robot |
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