An exhaust muffler for a screw unit

Abstract

The invention relates to an exhaust silencer for a screw-type unit. The exhaust silencer comprises an air inlet pipe, a silencer housing and an air outlet pipe which are straightly communicated in sequence, wherein the silencer housing comprises a divergent type air inlet divergent pipe, a straight pipe and a reducing type air outlet reducing pipe; a plurality of partition boards are arranged in the air inlet divergent pipe at intervals, and through hole type air holes are formed in each partition board so that the air inlet divergent pipe forms a plurality of partition cavities communicated with the air outlet pipe; an inserting pipe is arranged on the air outlet pipe, and the end of the air outlet pipe is inserted in the cavity of the silencer in a suspended mode; oil return holes are formed in the pipe body at one end, close to the air outlet pipe, of the inserting pipe at intervals circumferentially. The exhaust silencer enables gas to be expanded gradually while obtaining wider silencing frequency band and higher silencing capacity, so that the pressure loss is effectively reduced. Therefore, the silencer is smaller in size under the precondition of guaranteeing the silencing capacity and the pressure loss.

Description

technical field [0001] The invention relates to a screw type cold water (heat pump) unit system, in particular to an exhaust muffler for a screw type cold water (heat pump) unit. Background technique [0002] Exhaust pressure pulsations are common in screw chilled water (heat pump) units, and these exhaust pulsations become audible sound sources in the system, affecting the noise and vibration of the entire unit. The method of reducing exhaust pulsation is generally to install a muffler on the exhaust port of the compressor or the exhaust pipe. This muffler is usually a pipe-expanding resistant muffler. The principle of muffler is to use the sudden change in the inner diameter of the pipe to reflect the sound wave and interference, so as to reduce the noise propagating along the pipeline. However, this kind of muffler needs a higher inner diameter expansion ratio of the pipeline. In engineering, the inner diameter expansion ratio is generally designed to be 3~4. Therefore, t...

AI Technical Summary

Problems solved by technology

For screw-type chilled water (heat pump) units with an inner diameter of the exhaust pipe exceeding Φ50mm, usually the pipe-expanding muffler cannot be directly applied, because this will make the muffler too bulky and affect the size and appearance of the unit. The more common method is to expand the inner diameter of the pipe A certain ratio, and then arrange a perforated partition in the expansion cavity. The noise reduction of this muffler is closely related to the structure of the partition, and it will produce a certain pressure loss, which will affect the performance of the unit.

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