4results about How to "Loud volume" patented technology

The utility model belongs to the technical field of soft-shelled turtle breeding, and particularly relates to a noise reduction oxygen supply machine suitable for soft-shelled turtle breeding, which comprises a mounting cylinder, two symmetrically arranged connecting frames are fixedly connected to the lower surface of the mounting cylinder, oxygen pumps are fixedly mounted in the connecting frames, and an auxiliary mechanism is arranged at the bottom of the mounting cylinder; by arranging the auxiliary mechanism, the oxygen dissolving amount of water is increased, the contact area of gas and water is increased, the oxygen supply efficiency is further improved, possible injury accidents are avoided, the noise reduction effect on operation of the oxygen pump and the motor can be achieved, quiet and stable oxygen supply to soft-shelled turtles is further guaranteed, and the service life of the soft-shelled turtles is prolonged. The soft-shelled turtle pond has the advantages of noise reduction, high safety and high oxygen supply efficiency, and compared with an existing oxygen supply device, the soft-shelled turtle pond is easy to raise sludge at the bottom of the pond and large in oxygen supply, and is more suitable for soft-shelled turtles to grow and breed in a quiet and comfortable environment.

The utility model belongs to the technical field of variable-frequency air compressors, and particularly relates to an efficient energy-saving type permanent magnet variable-frequency air compressor which comprises a base plate, a fixing base is fixedly installed on the upper surface of the base plate, an air storage tank is movably installed in the fixing base, and a fixing assembly is fixedly installed on the upper surface of the base plate. One end of the fixing assembly is attached to the outer wall of the air storage tank, a mounting plate is fixedly mounted on the upper surface of the air storage tank, an air compressor body is fixedly mounted on the mounting plate and connected with the air storage tank, two sets of protection frames are movably mounted on the upper surface of the mounting plate, and a pressure gauge is fixedly mounted on the upper surface of the air storage tank. And two groups of partition plates are movably mounted on the inner wall of the gas storage tank. The device has the advantages that when accumulated water is generated in the air storage tank, the two groups of electric push rods push the partition plate to move towards the middle simultaneously, so that the accumulated water can be concentrated on the drainage pipe to be drained.

The utility model relates to the technical field of communication masks, in particular to a communication mask with a built-in sound transmission diaphragm cover and a Bluetooth microphone, which comprises a base body, a mirror surface mounted on the outer side of the base body, a clamping groove formed in the lower side of the mirror surface, and a respirator fixed on the inner wall of the clamping groove, the inner wall of the clamping groove is attached to the outer side of the respirator, a cover plate is fixed to the inner side of the respirator, and a Bluetooth microphone is detachably fixed to the side wall of the cover plate. According to the invention, the installation position of the Bluetooth microphone is changed, and the obstruction of the communication mask to the sound of firefighters is reduced, so that the sound transmitted by the Bluetooth microphone is increased, the noise is reduced, and the communication accuracy of the firefighters is improved.

This utility model discloses a speaker sound outlet cavity structure, including a sound outlet cavity, a speaker, and a pad. The speaker is installed at the upper end of the sound outlet cavity, and the pad is installed at the lower end of the sound outlet cavity. The upper side of the pad has several spaced-apart recesses. One side of the sound outlet cavity has a sound outlet. The speaker and the pad are vertically opposite each other, with the speaker's sound output direction facing the upper side of the pad. The sound emitted by the speaker is reflected by the upper side of the pad and the recesses of the pad before being output from the sound outlet. This utility model can further improve sound loudness and bass effect, and can make the emitted sound have a stereo surround sound effect.