Oil return device and air-conditioning unit

Abstract

The invention discloses an oil return device and an air-conditioning unit which belongs to the technical field of air conditioning and is designed to solve the problem of low oil return efficiency of the existing device. The invention relates to an oil return device, comprising an oil return assembly provided with a return port, a float, a heavy hammer and a return pipe, among which the oil return assembly is connected with the float, the upper end of the heavy hammer is connected with the float or the oil return assembly, the lower end is connected to the upper end of the oil return pipe, the oil return port communicates with the oil return pipe, and the oil return pipe can adjust its length in the vertical direction at least according to its force in the vertical direction. In that oil return device and the air-condition unit of the invention, the buoyancy and gravity balance principle are used, such that the oil return port can be accurately position in the vertical direction of the liquid surface of the oil-rich layer with the lowest height, so that the oil return is reliable, the oil return efficiency is improve, and the oil-free operation of the compressor is prevented.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to an oil return device and an air conditioner set provided with the oil return device. Background technique [0002] The oil return device is widely used in air-conditioning, refrigeration and other industries. However, the position of the oil return port of some existing oil return devices is fixed, which cannot follow the change of the liquid level, and the oil cannot be returned due to misalignment, and the compressor has the hidden danger of oil shortage operation. [0003] Although some technical solutions overcome the above-mentioned defects by setting movable oil return ports that can follow the liquid level in the vertical direction, there are the following deficiencies in these technical solutions: 1. The buoyancy cannot be adjusted, and the movable oil return ports are difficult to move vertically. The direction is accurately located at the lowest oil-rich layer...

AI Technical Summary

Problems solved by technology

However, the position of the oil return port of some existing oil return devices is fixed and cannot follow the change of the liquid level, and the oil cannot be returned due to misalignment, and the compressor has the hidden danger of oil shortage operation

[0003] Although some technical solutions overcome the above-mentioned defects by setting movable oil return ports that can follow the liquid level in the vertical direction, there are the following deficiencies in these technical solutions: 1. The buoyancy cannot be adjusted, and the movable oil return ports are difficult to move vertically. The direction is accurately located at the lowest oil-rich layer liquid surface; 2. The movable oil return port can only follow the liquid level height change in the vertical direction limitedly. When the air flow movement causes the liquid level to fluctuate or tilt, the oil return port cannot follow the liquid level in the horizontal direction Moving, it is difficult to accurately locate the liquid surface of the oil-rich layer with the lowest height, resulting in poor or even impossible oil return; 3. The float slides along the guide rod, and there is a phenomenon of stagnation; 4. The oil return efficiency is not high

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