A filling nozzle on the main pipeline
A nozzle and main pipe technology, which is applied in the field of main pipe equipment in pressurized water reactor nuclear power plants, can solve problems such as thermal shock of charging nozzles and thermal sleeve fractures, and achieve the effect of preventing fractures
Active Publication Date: 2016-06-29
NUCLEAR POWER INSTITUTE OF CHINA
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Problems solved by technology
[0003] The purpose of the present invention is to provide a nozzle for charging and connecting the main pipeline, which can solve the thermal shock on the charging connecting pipe caused by the direct contact between the charging flow and the charging connecting pipe, and the fracture of the thermowell due to vibration during the filling process.
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[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0017] Such as Figure 1~Figure 3 As shown, an upper charging nozzle of a main pipeline includes a thermowell 1 and an upper charging nozzle 2, wherein the thermowell 1 is a cantilever beam structure in the shape of a cylinder as a whole, the outer side of the upper end is a conical platform structure, and the lower end is a pipe wall A cylindrical structure with a thickness of 5mm, and an annular thermowell boss 5 is formed on the outer wall of the lower end of the cylindrical barrel; It is connected outside the cylinder at the lower end of the thermowell 1 and forms an annular space 6. The upper filling tube boss 4 is located at the lower end of the thermowell boss 5, and the upper filling tube boss 4 is connected to the outer side of the cylinder at the lower end of the thermowell 1. The gap between the walls is not more than 0.1m...
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The invention relates to the technical field of main pipeline equipment of a pressurized water reactor nuclear power plant, and in particular discloses an up-charging filler neck of a main pipeline. The up-charging filler neck comprises a heat sleeve and an up-charging adapter pipe, wherein the heat sleeve is integrally in a cylindrical cantilever beam structure; the up-charging adapter pipe is fixedly sleeved at the outer side of the heat sleeve, and an annular space is formed between the up-charging adapter pipe and the heat sleeve; small holes are formed in the wall of the heat sleeve; and the heat sleeve is communicated with the annular space through the small holes. In the up-charging filler neck of the main pipeline, a low-temperature fluid enters the annular space through the small holes in the wall of the heat sleeve and is mixed with a fluid in a loop during an up-charging process so as to prevent heat impact caused to the up-charging adapter pipe due to direct contact between the up-charging flow and the up-charging adapter pipe; simultaneously, annular lugs are arranged in the heat sleeve and the up-charging adapter pipe; the clearance between the lugs and the heat sleeve is not larger than 0.1 mm; the amplitude of vibration of the heat sleeve caused by flow vibration during up-charging injection is limited; and cracking of the heat sleeve caused by flow vibration during the up-charging injection process is prevented.
Description
technical field [0001] The invention belongs to the technical field of main pipeline equipment of a pressurized water reactor nuclear power plant, and in particular relates to an upper filling nozzle of a main pipeline. Background technique [0002] The filling flow connection on the main pipeline is the connection connection between the chemical and volume control system of the nuclear power plant and the main system. The chemical and volume control system is the main auxiliary system of the primary circuit of the PWR nuclear power plant. Its function is to maintain the programmed water level of the pressurizer through the function of charging and discharging to maintain the water volume of the primary circuit system. When the reactor is running stably, the fluid temperature in the cold section of the main pipeline is about 293°C. The temperature of the fluid injected into the main system by the chemical and volumetric system is about 265°C, which is quite different from t...
Claims
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IPC IPC(8): G21C15/22
CPCY02E30/30
Inventor 刘向红王保平任云蒲小芬
Owner NUCLEAR POWER INSTITUTE OF CHINA