45results about How to "Reduce magnetic leakage" patented technology

The invention provides a linear motor which comprises a coil unit and a magnet unit. The magnet unit comprises two groups of symmetrical magnet arrays which are parallel relatively and are located on a magnet yoke, the magnet arrays are formed by a first-class magnet, a second-class magnet and a third-class magnet, the third-class magnet is arranged between the first-class magnet and the second-class magnet, the first-class magnet, the second-class magnet and the third-class magnet are periodically and alternatively distributed along an X axis in a Halbach magnet array mode, the first-class magnet and the second-class magnet are alternatively distributed along the X axis at an equal interval, and the magnetization direction of the first-class magnet and the magnetization direction of the second-class magnet are in the forward direction of a Y axis and the reverse direction of the Y axis. The third-class magnet is one prism magnet or comprises three prism magnets; when the third-class magnet is the prism magnet, the opposite surfaces of the adjacent magnets of different classes are both inclined planes; when the third-class magnet comprises the three prism magnets, the opposite surfaces of the adjacent different prism magnets are both inclined surface. Magnetic force lines formed in the linear motor are more continuous, the vertical magnetic flux and the horizontal magnetic flux in the magnet arrays can be improved, and therefore the pushing force in the corresponding direction can be improved.

The invention provides a thawing device. The thawing device includes a metal cylinder defining a thawing chamber with a forward opening, a radio frequency generating module for generating a radio frequency signal, electrically connected with the radio frequency generating module and capable of generating radio frequency waves of corresponding frequencies in the thawing chamber according to the radio frequency signal The radio frequency antenna, and the detection module for detecting the incident wave signal and the reflected wave signal of the radio frequency antenna. The detection module is configured to calculate the change rate of the dielectric coefficient of the object to be treated according to the voltage and current of the incident wave signal and the voltage and current of the reflected wave signal, so as to judge the thawing progress of the object to be processed. The thawing device also includes a baffle arranged to be in conductive connection with the inner wall of the thawing chamber. The detection module is set in the shielding chamber surrounded by the baffle and the inner wall of the thawing chamber, which can effectively prevent the radio frequency waves generated by the radio frequency antenna from interfering with the detection module, and improve the accuracy of the incident wave signal and the reflected wave signal detected by the detection module. accuracy.

The invention discloses an insert type water meter, and belongs to the field of water supply measuring instrumentation. The insert type water meter consists of a coaxial cable, a copper tube, a stainless steel shell, a polarity detector, a permanent magnet, a magnetic field test coil, positive and negative electrodes, a lead wire plate, a shield plate, a coil brace, a plastic piece and an intelligent part; and the insert type water meter is mainly used in the field of flow measurement. The insert type water meter has a simple structure, small volume and low cost, changes to utilize the permanent magnet and the electrodes as a basic meter, has the advantages of reliable performance, flexible control, uneasy blockage and so on, and has quite important significance.

The invention provides a thawing device. The thawing device includes: a cylinder body defining a thawing chamber with a forward opening for placing the object to be treated; a device door for opening and closing the thawing chamber arranged at the forward opening of the thawing chamber; For generating the radio frequency generation module of radio frequency signal; And be respectively horizontally arranged at the top wall and the bottom wall place of the thawing chamber, and the upper electrode plate and the lower electrode plate that are electrically connected with the radio frequency generation module respectively, so that according to the radio frequency signal in the thawing chamber The radio frequency waves of the corresponding frequency are generated in the chamber, and the objects to be treated in the thawing chamber are thawed. The cylinder body and the device door body are respectively provided with electromagnetic shielding features, and the electromagnetic shielding features arranged on the cylinder body and the electromagnetic shielding features arranged on the device door body are set as conductive connections, so as to reduce the outward movement of the thawing device when the device door body is closed. magnetic leakage. The invention can effectively reduce the magnetic leakage of the thawing device and reduce the harm to users.

The invention relates to a driver for generating twisting motion in the mechanical engineering, in particular to a piezoelectric type twisting driver. The driver comprises a base, two piezoelectric material bonding sheets, a holding screw, a motion converting disk, an output shaft and a housing, wherein a through groove is formed at the center of the base, one end of each of the two piezoelectricmaterial bonding sheets is fixed, the other ends of the two piezoelectric material bonding sheets transfer motion to the motion converting disk by using the holding screw which is connected with the motion converting disk through threaded connection or interference connection, no clearance is reserved between the piezoelectric material bonding sheets and the holding screw, the top of the motion converting disk is connected with the output shaft, and the housing fixes the output shaft by a bearing. The piezoelectric type twisting driver has the advantages of simple mechanical structure, small volume, low power consumption, high energy density, small magnetic leakage, high anti-electromagnetic interference ability, simple control circuit, low use cost, high response speed, small noise and strong commonality, and the like.