Storage tank for cooling superconducting cable

Abstract

The invention discloses a storage tank for cooling a superconducting cable. The storage tank comprises a base, an inner tank and an outer tank, wherein a heat-preserving and heat-insulating material is filled between the inner tank and the outer tank; the outer tank is provided with a vacuumizing interface; the outer tank comprises a first outer tank body and a second outer tank body; the first outer tank body is provided with a liquid inlet interface and a power supply connecting pipe; the second outer tank body is provided with a standby connecting pipe and a superconducting cable interface; the first outer tank body is fixedly arranged on the base; the second outer tank body is arranged on the base in a sliding way along the axial direction; the first outer tank body is in hermetical butt joint with the second outer tank body through an expansion joint; radial support pieces are arranged between the inner wall of the first outer tank body and the outer wall of the inner tank as well as between the inner wall of the second outer tank body and the outer wall of the inner tank; and the base is provided with a limiting device for limiting the axial sliding position of the second outer tank body. Due to the adoption of the storage tank, local stress caused by cold concentration deformation of the inner tank is effectively reduced, cracks on a welding seam between the power supply connecting pipe and the outer tank are avoided, and quality of the storage tank is improved, and the service life of the storage tank is prolonged.

Description

technical field [0001] The invention relates to a storage tank, in particular to a storage tank for cooling superconducting cables. Background technique [0002] Superconducting cables are used in short-distance power transmission occasions (such as generators to transformers, substation centers to substations, underground substations to urban power grid ports) and electroplating plants, power plants and substations, etc. The zero-resistance property of the material can be used to transmit electricity and make large-scale magnets. There will be a lot of loss in ultra-high voltage transmission, and the use of superconductors can minimize the loss. However, based on the best working temperature range of conductive cables is 50K ~ 90K, so All countries are now using liquid nitrogen as a refrigerant. At the same time, liquid nitrogen has the advantages of low production cost and no pollution. Due to the particularity of superconducting cables, in addition to conventional liqui...

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Problems solved by technology

However, since the power supply connection on the liquid nitrogen storage tank needs to be fixedly connected to the power supply equipment, the inner tank of the storage tank will be cooled and contracted when liquid nitrogen is added, and the outer tank set outside the inner tank will be pulled together by the inner tank. Shrinkage, due to the existence of the power supply connection tube, the outer tank cannot shrink axially, so the weld seam between the outer tank and the power supply connection tube will generate tension and cause cracks in the weld seam; Excessive local stress on the outer tank

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