Direct type evaporator capable of automatically returning oil

Abstract

The invention relates to a direct type evaporator capable of automatically returning oil. The direct type evaporator comprises a plurality of evaporation tubes which thread through a left tube plate, a plurality of fins and a right tube plate from top to bottom, wherein one end of each evaporation tube is respectively connected to a liquid dividing head of an evaporator liquid inlet tube through a plurality of capillary tubes, the other end of the evaporation tube is respectively communicated with a gas collecting tube, and a gas return tube communicated with a compressor is arranged on the top of the gas collecting tube. The direct type evaporator further consists of an oil return small vertical tube, wherein the bottom port of oil return small vertical tube is communicated with the gas collecting tube, the bottom port of the oil return small vertical tube is lower than the port of the bottommost evaporation tube connected to the gas collecting tube, and the upper port of the oil return small vertical tube is communicated with the gas return tube. By communicating the bottom part of the gas collecting tube and the gas return tube with the independent oil return small vertical tube, the evaporator can realize the return of oil accumulated at the bottom part of the gas collecting tube, has simple structure, and is convenient for the overall installation. The oil return small vertical tube is stable and excellent to return oil, has good oil return effect and can ensure that a refrigeration device is safely used.

Description

technical field [0001] The invention relates to a direct type evaporator, in particular to an automatic oil return direct type evaporator which can automatically send the oil accumulated in the evaporator back to the compressor. Background technique [0002] In small refrigeration equipment, the position of the air return pipe is generally determined at the lower part of the air collecting pipe, and the lubricating oil carried out by the refrigerant can return to the compressor together with the refrigerant to facilitate the oil return of the system. However, limited by the structure of the evaporator, it is inevitable that the air return pipe will interfere with other equipment or cause difficulties in welding and installation if the air return pipe is placed close to the bottom surface; The oil return is unstable, affecting the normal use of the compressor and evaporator. Contents of the invention [0003] In order to solve the disadvantages of unstable oil return a...

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Problems solved by technology

[0003] In order to solve the disadvantages of unstable oil return and poor oil return effect of the air return pipe installed at the bottom of the evaporator in the prior art, the present invention provides a simple structure, the air return pipe is installed in the evaporator, the upper part of the oil return is stable, and the oil return effect is low. Good direct evaporator with automatic oil return

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