Electromagnetic circuit breaker delay tube with leakage-proof function

Abstract

The invention discloses an electromagnetic circuit breaker time-delay tube with a leakage-proof function, and relates to the technical field of electromagnetic circuit breaker time-delay tubes, the electromagnetic circuit breaker time-delay tube comprises a fixed iron core body and a time-delay tube body, a boss in the middle of the fixed iron core body is in contact sealing with the inner wall of the time-delay tube body, the end part of the boss is provided with a first connecting column, and one end of the first connecting column is connected with a pressure spring; one end of the compression spring is connected with a second connecting column, the second connecting column is arranged on the movable iron core body, the movable iron core body is movably arranged in the time delay pipe body, time delay oil is arranged in the time delay pipe body, fusion welding bosses are arranged at the end of the fixed iron core body and the outer edge of a boss at the end of the time delay pipe body, and arc-shaped grooves are symmetrically formed in the end face of the fixed iron core body. According to the invention, the sealing effect and the sealing capability of the time-delay tube of the electromagnetic circuit breaker are improved, the sealing parts of the fixed iron core and the time-delay tube are prevented from being extruded by the time-delay oil due to thermal expansion, the service life is prolonged, the practicability is improved, the oil leakage phenomenon caused by extrusion due to expansion of the time-delay oil during a breaking capability test is avoided, and the sealing effect meets the detection requirement.

Description

technical field [0001] The invention relates to the technical field of delay tubes for electromagnetic circuit breakers, in particular to a delay tube for electromagnetic circuit breakers with a leak-proof function. Background technique [0002] The advantages of electromagnetic circuit breakers are high sensitivity, no need to change oil, and they are used in occasions that require frequent operations. The delay tube part is a key component of electromagnetic circuit breaker products. Its interior is a sealed space, and the moving iron core inside moves in place. The length of time determines the delay jump time of the electromagnetic circuit breaker switch. Through continuous efforts and improvements, the designers of our company have improved the sealing structure of the delay tube assembly, which can greatly improve the sealing firmness of the delay tube assembly, so that the electromagnetic circuit breaker will not be damaged due to delay when passing through a large cu...

AI Technical Summary

Problems solved by technology

Through continuous efforts and improvements, the designers of our company have improved the sealing structure of the delay tube assembly, which can greatly improve the sealing firmness of the delay tube assembly, so that the electromagnetic circuit breaker will not be damaged due to delay when passing through a large current or high temperature environment. The temperature of the time-delay oil in the time-delay tube rises, the volume expands, and the sealing part between the fixed iron core and the time-delay tube is squeezed out, resulting in oil leakage, which leads to the failure of the switch. When the electromagnetic circuit breaker coil flows through the breaking capacity test current of 1000A, the coil generates a large amount of heat, which makes the temperature of the delay tube assembly very high, and the volume of the delay oil expands when heated, and the fixed iron core is easily dropped from the delay tube due to the high pressure of the delay oil. , resulting in product failure

In addition, when the electromagnetic circuit breaker is subjected to a high temperature test or a long-term high current, the temperature of the delay oil in the delay tube rises and the volume expands. If the seal between the delay tube and the fixed iron core is not tight, oil leakage will occur

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