4 results about "Magnetic leakage" patented technology

The invention provides an unfreezing device. The unfreezing device includes a cylindrical body, a device door body, a radio frequency generation module, an upper electrode plate and a lower electrodeplate; the cylindrical body is limited to have an unfreezing cavity having a forward opening and used for placing a to-be-processed object; the device door body is arranged on the forward opening of the unfreezing cavity and used for opening and closing the unfreezing cavity; the radio frequency generation module is configured to generate radio frequency signals; the upper and lower electrode plates are respectively and horizontally arranged on the top and bottom walls of the unfreezing cavity and electrically connected to the radio frequency generation module to generate radio frequency wavesof corresponding radio frequency in the unfreezing cavity according to the radio frequency signals and unfreeze the to-be-processed object in the unfreezing cavity; the cylindrical body and the device door body are respectively provided with electromagnetic shielding characteristics; and the electromagnetic shielding characteristic arranged on the cylindrical body and the electromagnetic shielding characteristic arranged on the device door body are arranged in conductive connection so as to reduce magnetic leakage from the unfreezing device when the device door body is closed. Thus, the magnetic leakage of the unfreezing device can be effectively reduced, and the harmfulness to users can be reduced.

The invention provides a passing through type steel pipe magnetic leakage detection air flotation detection boot which comprises sensors and a cylindrical body of which the two ends are of an open type structure. The inner diameter of the cylindrical body is larger than the outer diameter of a steel tube to be detected, the cylinder wall of the cylindrical body is provided with at least two rings of flow restriction orifices used for inputting pressure air into an inner hole of the cylindrical body and at least one ring of an annular groove used for installing the sensors, the number of each ring of the flow restriction orifices is same and is 6, and all the flow restriction orifices in each ring of the flow restriction orifices are uniformly distributed in the cylinder wall in the circumferential direction of the cylindrical body; the number of the sensors is at least pid/a, in the formula, d represents the outer diameter of the steel pipe to be detected, a represents the circumferential detection covering range of one sensor on the surface of the steel pipe to be detected, and the sensors in each ring of the annular groove are uniformly arranged in the circumferential direction of the annular groove.

The invention discloses a multi-DC equalizing charge system. The equalizing charge work is finished through two charge mechanisms. The invention has the following advantages: in comparison with dissipative equalizing, the problem of heat management is avoided; in comparison with non-dissipative equalizing with capacitive or inductive energy storage, the method has large equalizing current, high efficiency and high speed; and in comparison with transformer equalizing, the method does not need a magnetic core or a coil, avoids magnetic leakage and has a controllable volume.