Rotary compressor and refrigeration system

The rotary compressor design with a lubrication structure and positioning mechanism addresses fluctuations in lubrication state due to oil level and speed changes, stabilizing oil supply and component fixation for enhanced performance.

JP2026056581AActive Publication Date: 2026-04-01DAIKIN INDUSTRIES LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2025-08-28
Publication Date
2026-04-01

AI Technical Summary

Technical Problem

In rotary compressors, the lubrication state is susceptible to fluctuations due to changes in oil level and rotational speed, leading to inconsistent performance.

Method used

A rotary compressor design with a lubrication structure that includes a casing, cylinder, piston, shaft, upper and lower bearings, rear muffler, and a positive displacement pump, equipped with a positioning mechanism to ensure consistent oil supply and firm fixation of components, using a trochoid pump to stabilize lubrication regardless of oil level or speed.

Benefits of technology

The design stabilizes lubrication by ensuring consistent oil supply and firm component fixation, reducing the influence of oil level and rotational speed fluctuations, thereby enhancing compressor performance.

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Abstract

This disclosure provides a rotary compressor equipped with a lubrication structure that ensures minimal fluctuations in the lubrication state even when the rotational speed of the rotary compressor changes, and a consistent oil level in the lubricating oil. [Solution] A rotary compressor comprising a casing, a cylinder disposed inside the casing, a piston that rotates eccentrically inside the cylinder, a hollow shaft connected to the piston and having an internal space, an upper bearing disposed above the cylinder and supporting the shaft, a lower bearing disposed below the cylinder and supporting the shaft, a rear muffler disposed below the lower bearing, and a positive displacement pump attached to the rear muffler and discharging oil into the internal space.
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Citation Information

Patent Citations

  • Fluid machine

    JP2006132332A

  • Hermetic compressor

    JP2007315261A

  • Rotary compressor

    JP2011208553A

  • Rotary fluid machine

    JP2012219654A

  • Compressor

    US20070071628A1