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Ejection system, oil return system of water chilling unit, control method and water chilling unit

A chiller and oil return system technology, applied in refrigerators, refrigeration components, compressors, etc., can solve the problem that the first-stage injection oil cannot remain in the suction port of the compressor, etc.

Pending Publication Date: 2019-12-03
GREE ELECTRIC APPLIANCES INC
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  • Description
  • Claims
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Problems solved by technology

[0005] In order to solve the technical problem in the prior art that the primary injection oil cannot remain in the suction port of the compressor, the main purpose of the present invention is to provide an injection system, an oil return system of a chiller, a control method, and a chiller

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  • Ejection system, oil return system of water chilling unit, control method and water chilling unit

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Embodiment Construction

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore are not It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

[0028] A water chiller provided by an embodiment of the present invention includes a compressor 1, a condenser 2, an evaporator 3, an oil tank 4, and an oil return system. The compressor 1 is provided with a volute and guide vanes inside, and the compressor 1 has a suction The port 11, the first exhaust port 12 and the second exhaust port 13, wherein the first exhaust port 12 refers to the exhaust port of the volute. The second exhaust port 13 of the compressor 1 communicates with the refrige...

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Abstract

The invention provides an ejection system, an oil return system of a water chilling unit, a control method and the water chilling unit, and relates to the technical field of oil return control. The ejection system comprises a first ejector, wherein the first ejector is provided with a first high-pressure inlet, a first mixing inlet and a first outlet, the first high-pressure inlet is used for introducing high-pressure gaseous refrigerant, and the first mixing inlet is used for introducing oil and liquid refrigerant mixed liquid; the first outlet is communicated with an oil tank through a firstbranch, and a first electromagnetic valve is arranged on the first branch; the first outlet is communicated with an air suction port of the compressor through a second branch, and a second electromagnetic valve is arranged on the second branch. When the guide vane opening degree is large and the impeller air suction capacity is high, the first electromagnetic valve is controlled to be opened to enable the first branch to be communicated, the second electromagnetic valve is controlled to be closed to enable the second branch to be disconnected, oil ejected by the first ejector directly entersthe oil tank and cannot be taken away by airflow at an air suction port of the compressor, and the oil shortage phenomenon of the oil tank is avoided.

Description

technical field [0001] The technical field of oil return control of the present invention, in particular, relates to an injection system, an oil return system of a chiller, a control method, and a chiller. Background technique [0002] Chillers (or air conditioning systems) are common refrigeration equipment that generally include centrifugal compressors. During the operation of the chiller, due to the high speed of the compressor and the large displacement, the resulting oil discharge is also large. Therefore, it is generally necessary to set up a special oil return path to recover the oil discharge from the compressor. [0003] In the prior art, the oil return is usually carried out through the primary injection and the secondary injection. The oil return of the primary injection is to lead the high-pressure gaseous refrigerant from the condenser into the ejector, and the mixed liquid containing lubricating oil and liquid refrigerant from the evaporator It is sucked out a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B31/00F25B49/02
CPCF25B31/004F25B49/02
Inventor 梁相之周卫华黄童毅黄千泽罗建飞
Owner GREE ELECTRIC APPLIANCES INC
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