RU146030U1 - VIBRATION ISOLATING DEVICE FOR PIPELINE OF EMERGENCY COOLING SYSTEM OF SUBMARINE NUCLEAR REACTOR - Google Patents

Abstract

Vibration isolation device for the pipeline of the emergency cooling system of a nuclear reactor of a submarine, consisting of a curved pipeline for the emergency cooling system of a nuclear reactor passing through the hull of the submarine and diverting cooled water to an onboard heat exchanger, characterized in that the pipeline of the emergency cooling system is made of several bent pipelines of a smaller bore , the total flow area of which is equal to the flow area of a single bent pipeline of the emergency cooling system.

Description

The utility model relates to the power equipment of submarines.

Known designs of vibration-isolating devices of pipelines in the form of bellows expansion joints, rubber-cord sleeves, for example, balanced (unloaded) bellows expansion joints described on pages 66-68 of the book "Unified Flexible Elements of Pipelines", M., publishing house of standards, 1988 authors A .P. Gusenkova, B.Yu. Lukina and V.S. Shustova.

The disadvantage of these structures is the impossibility of their use in the reactor cooldown system due to high pressures and temperatures of the working medium supplied to the pipelines in an emergency, because There are no compensators for these parameters.

The closest in technical essence to the utility model is vibration isolation using self-compensation of the pipeline (Grigoryev L.Ya., “Self-compensation of pipelines”, L., Energy, 1969, 161 pp., Prototype). At the same time, in the emergency cooldown system of a nuclear reactor, its single pipelines are rigidly welded into the submarine's hull. Emergency cooling is carried out due to the natural circulation (EC) of the coolant through single pipelines between the nuclear reactor and the outboard heat exchanger, also rigidly fixed to the housing. Vibration isolation of the nuclear reactor along these pipelines from the shell is carried out due to the bending flexibility of single pipelines, which are made with bends for self-compensation of mutual movements of the shell and the nuclear reactor mounted on the shell for depreciation. The disadvantage of this design is the increased transmission of vibration from the nuclear reactor to the body and the outboard heat exchanger due to the low flexibility of single pipelines, which re-radiate it further into the environment during the entire operation of the power plant. This is an important unmasking feature.

The purpose of the utility model is to create a highly effective vibration isolation of a nuclear reactor along the pipelines of the emergency cooling system and thereby increase the acoustic secrecy of the submarine.

The essence of the utility model consists in the fact that a system of several bent pipelines of a smaller bore (diameter) is used as a vibration-isolating device, the total cross-sectional area of which is equal to the cross-sectional area of a single dampening pipeline. From the theory of resistance of materials (see, for example, a reference book edited by I. A. Birger et al. “Strength calculations of machine parts”, M. Mechanical Engineering, 1966, pp. 406-415), it is known that bending compliance pipeline (a rod with an annular cross-section, and it is it that determines the amount of vibration isolation of the pipeline during self-compensation - the higher the flexibility during bending, the higher the vibration isolation) is inversely proportional to the fourth degree of the diameter of the pipeline. The cross-sectional area of the pipeline is proportional to the square of the diameter, so the required number of curved pipelines of reduced diameter will be inversely proportional to the square of the ratio of the diameter of a single curved pipe to the diameter of small pipelines, to preserve the total area of the cross-section. Based on the foregoing, the total increase in the compliance of several pipelines of smaller diameter with respect to the compliance of a single curved pipeline (i.e., the improvement of vibration isolation) will be directly proportional to the square of the decrease in their diameter.

The scheme of the proposed device is shown in figure 1. The device contains several bent pipelines 2 connected to a nuclear reactor 1 mounted on the housing 4 for depreciation 5, smaller than the single curved pipeline, the passage section passing through the housing 4 and leading cooling water to the outboard heat exchanger 3.

The device operates as follows. The force Q _k from vibration a of the nuclear reactor 1 is attenuated by the highly effective vibration isolation of several bent pipelines 2 and is transmitted to the housing 4 and the heat exchanger 3 significantly reduced compared to the design when self-compensation is carried out by a single bent pipeline with a larger flow area. Thanks to the use of the technical solution, reliable high-performance vibration isolation of the nuclear reactor from the hull of the submarine is ensured, which increases its acoustic secrecy.

Claims (1)

The vibration isolation device of the pipeline of the emergency cooling system of a submarine nuclear reactor, consisting of a bent pipeline of the emergency cooling system of a nuclear reactor passing through the hull of the submarine and diverting cooled water to the outboard heat exchanger, characterized in that the pipeline of the emergency cooling system of the submarine is made of several curved pipes with a smaller through passage , the total passage area of which is equal to the area of the passage section of a single o bent pipeline emergency dampening system.