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Oil return device and control method thereof

A control method and control unit technology, which is applied in the direction of refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve problems such as ineffectiveness, and achieve the effect of reducing the probability of startup failure

Active Publication Date: 2017-11-24
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this oil return scheme is based on the running state of the unit, and it cannot be effective when the unit is shut down.

Method used

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  • Oil return device and control method thereof

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Experimental program
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Effect test

Embodiment approach 1

[0035] Such as figure 1 As shown, the oil return device is usually used in chillers, especially centrifugal chillers. It includes a refrigerant heat exchanger 1, an oil tank 5, a pump 2 and a control unit (not shown in the figure). The input end of the pump 2 is connected with the refrigerant heat exchanger 1, and the output end is connected with the oil tank 5; the oil tank 5 is used for storing the lubricating oil of the chiller. The oil tank 5 is provided with an oil heater 3 for heating the lubricating oil in the oil tank 5, an oil temperature sensor 4 for detecting the oil temperature T of the lubricating oil in the oil tank 5, and an oil temperature sensor 4 for detecting the oil temperature T of the lubricating oil in the oil tank 5. The liquid level sensor 6 that detects the liquid level height H; The liquid level sensor 6 preferably adopts a liquid level switch; The pump 2, the liquid level sensor 6, the oil heater 3, and the oil temperature sensor 4 are connected wi...

Embodiment approach 2

[0062] In this embodiment, on the basis of the solution in Embodiment 1, the liquid level switch is used as the liquid level sensor to detect the liquid level height, and at the same time, the liquid level switch is used as the control unit of the pump 2 to control the opening of the pump 2 ; The liquid level switch also sends a switch signal to the control unit of the oil heater 3 to control the oil heater 3 . As a preferred embodiment, the liquid level switch has a plurality of floats at different water levels, and each float provides water level signals indicating different water levels, wherein the signals of different water levels correspond to different voltage signals. The specific control method will be described below taking H1=H2 as an example, that is, when the water level changes near H1, the liquid level switch will simultaneously control the pump 2 and the oil heater 3 to change their working states. When the water chiller is ready to start up, firstly the oil he...

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Abstract

The purpose of the present invention is to provide an oil return device, which mainly solves the problem of lubricating oil recovery when the existing heat exchange equipment is shut down. It includes a refrigerant heat exchanger, an oil tank, a pump and a control unit; the input end of the pump is connected to the refrigerant heat exchanger, and the output end is connected to the oil tank; the oil tank is provided with a an oil heater, an oil temperature sensor for detecting the temperature of the oil in the oil tank, and a liquid level sensor for detecting the liquid level in the oil tank; the pump and the liquid level sensor, the The oil heater and the oil temperature sensor are respectively connected to the control unit; the control unit is used to control the opening and closing of the pump according to the liquid level H detected by the liquid level sensor, and according to the The liquid level H detected by the liquid level sensor and the temperature T detected by the oil temperature sensor control the opening and closing of the oil heater. The invention also provides a control method.

Description

technical field [0001] The invention relates to the field of heat exchange equipment, in particular to an oil return device of heat exchange equipment and a control method thereof. Background technique [0002] The R134a environmentally friendly refrigerant used in the centrifugal chiller has the characteristics of complete compatibility with the synthetic grease lubricating oil, and the solubility of the refrigerant increases as the temperature of the lubricating oil decreases. Therefore, when the unit is shut down for a long time in the transitional season, it is necessary to keep the oil heater powered on to maintain the oil temperature, or manually close the valve of the oil circuit system to prevent the expansion of the lubricating oil volume from leaking into the refrigerant system, resulting in failure to restart the machine. The patent No. 200820201596.1 discloses a "micro-pressure differential" automatic oil return system, which is not affected by the flow rate comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B43/02F25B49/00
Inventor 周宇李宏波张治平刘贤权潘翠万亮
Owner GREE ELECTRIC APPLIANCES INC
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