Locking type filter tuning screw device and filter

Abstract

The invention discloses a locking type filter tuning screw device and a filter. The tuning screw device comprises a tuning screw assembled on a filter cover plate, the tuning screw is in threaded connection with the filter cover plate, an annular telescopic groove capable of axially deforming is formed in the threaded connection position of the tuning screw and the filter cover plate, an axial blind hole extending to the lower portion of the corresponding position of the annular telescopic groove is arranged at the upper end of the tuning screw, the inner wall of the axial blind hole is provided with an internal thread at the lower part or the upper part corresponding to the annular telescopic groove, and the axial blind hole is internally provided with a locking screw which is matched and connected with the internal thread; and when the locking screw is screwed with the internal thread in the axial blind hole, the locking screw axially compresses or stretches the annular telescopic groove, so that the annular telescopic groove is elastically deformed. The locking effect between the device and the filter is firm and stable, meanwhile, materials adopted by the device are few, and the overall weight of the filter assembled with the device can be reduced.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a locking filter tuning screw device and a filter. Background technique [0002] A filter is a frequency-selective device that allows specific frequency components in a signal to pass while greatly attenuating other frequency components. As a frequency selection device, the cavity filter is widely used in the communication field. Compared with other types of filters, the cavity filter has a firm structure, stable and reliable performance, small size, moderate Q value, and good heat dissipation performance, and can be used for larger power and frequency. Cavity filters are mainly used in the front-end filtering of major communication base stations to filter out strong out-of-band interference signals. The cavity filter includes a cavity body and a cover plate, a resonant cavity is formed between the cavity body and the cover plate, a resonant tube is arranged in the reson...

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Problems solved by technology

[0004] However, the above-mentioned Chinese patent still has certain disadvantages in the process of use: first, the pre-tightening force between the tuning screw and the locking member drops sharply after the initial stress is released, and it is often necessary to use anti-loosening glue for a second time. Solidify the tuning screw; second, the weight of a single tuning screw device is relatively heavy. On a filter with a large number of screw devices, the weight of the screw accounts for a large proportion, which makes the filter unable to reduce weight

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