CN-121977305-A - Air conditioning system

CN121977305ACN 121977305 ACN121977305 ACN 121977305ACN-121977305-A

Abstract

The invention belongs to the technical field of air conditioning equipment, and particularly relates to an air conditioning system which comprises a refrigerant loop, an oil separator and a controller, wherein an oil return port of the oil separator is connected with an air suction port of a compressor through an oil return main path, an oil return capillary is arranged between the oil return main path and the air suction port of the compressor, an oil return branch is further arranged between the oil return capillary and the oil return port, a high-pressure oil storage tank is arranged on the oil return branch, before a preset working mode, the controller stores engine oil output from the oil return port into the high-pressure oil storage tank, and when the working mode is preset, the oil return branch is started, so that the engine oil stored in the high-pressure oil storage tank is conveyed to the compressor through the oil return capillary. The engine oil stored in the high-pressure oil storage tank of the air conditioning system is directly conveyed back to the compressor through the oil return capillary tube when the air conditioning system works in a preset mode, so that the time period of high oil application rate and low oil return amount in the early stage of sleep starting is spent, and the oil return capillary tube of the oil plug is re-communicated after the four-way valve commutates before defrosting, so that the problem of oil plug is avoided.

Inventors

ZHANG WENQIANG
BIE QINGFENG
LI XIANTING
DING GUOLIANG
LIU XINXIN
LIU XINYI
GAO YONGKUN
NING MINGHUI

Assignees

青岛海信日立空调系统有限公司

Dates

Publication Date: 20260505
Application Date: 20260407

Claims (10)

1. An air conditioning system, comprising: A refrigerant circuit for circulating a refrigerant through the compressor, the condenser, the expansion valve, and the evaporator; The oil separator is provided with an air inlet port, an air outlet port and an oil return port, wherein the air inlet port is connected with an air outlet of the compressor, the oil return port is connected with an air suction port of the compressor through an oil return main path, and a first electromagnetic valve is arranged on the oil return main path and used for controlling the on-off of the oil return main path; An oil return capillary is arranged between the oil return main path and the air suction port of the compressor, an oil return branch is also arranged between the oil return capillary and the oil return port, a high-pressure oil storage tank is arranged on the oil return branch, the installation height of the high-pressure oil storage tank is higher than that of the oil separator, a second electromagnetic valve and a third electromagnetic valve are arranged on the oil return branch, the second electromagnetic valve is positioned between the high-pressure oil storage tank and the oil return port, and the third electromagnetic valve is positioned between the high-pressure oil storage tank and the oil return capillary; And the controller is configured to control the opening and closing of the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, store the engine oil output from the oil return port in a high-pressure oil storage tank before a preset working mode, and open the oil return branch when the working mode is preset, so that the engine oil stored in the high-pressure oil storage tank is conveyed to the compressor through an oil return capillary tube.
2. An air conditioning system according to claim 1, wherein, One of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger; the indoor heat exchanger and the outdoor heat exchanger are connected with the compressor through a four-way valve, the four-way valve comprises a first valve port, a second valve port, a third valve port and a fourth valve port, the first valve port is connected with the air outlet port, the second valve port is connected with one end of the indoor heat exchanger, the third valve port is connected with an air suction port of the compressor, and the fourth valve port is connected with one end of the outdoor heat exchanger.
3. An air conditioning system according to claim 2, wherein, The high-pressure oil storage tank and the oil separator are arranged in the outer shell, and a heat preservation piece is arranged outside the high-pressure oil storage tank and used for preserving heat of the high-pressure oil storage tank.
4. An air conditioning system according to claim 2, wherein, And when the refrigerating operation mode and the heating operation mode are adopted, the controller controls the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve to be opened, and as the height of the high-pressure oil storage tank is higher than that of the oil separator, engine oil output from an oil return port on the oil separator is returned to the compressor through the oil return main circuit.
5. An air conditioning system according to claim 2, wherein, The preset working mode comprises a restarting state after stopping, after the controller receives a stopping signal, the controller controls the compressor frequency to maintain the original frequency to run, the first electromagnetic valve is closed, the second electromagnetic valve and the third electromagnetic valve are opened, and engine oil in the oil separator is conveyed into the high-pressure oil storage tank to be stored.
6. An air conditioning system according to claim 5, wherein, When the first preset time is reached, the controller controls the compressor to be shut down, the controller controls the second electromagnetic valve and the third electromagnetic valve to be closed, and the first electromagnetic valve is opened so as to realize pressure equalizing treatment on the compressor; and when the compressor shutdown time reaches a second preset time, the controller controls the first electromagnetic valve to be closed.
7. An air conditioning system according to claim 6, wherein, When the controller receives a starting signal, the controller controls the compressor to be started, judges the ambient temperature, and controls the first electromagnetic valve to be closed when the ambient temperature is lower than a first preset ambient temperature, and the second electromagnetic valve and the third electromagnetic valve to be opened; when the starting time of the compressor is not less than a third preset time and the exhaust superheat degree of the compressor is greater than the preset superheat degree, the controller controls the first electromagnetic valve to be opened; When the ambient temperature is not lower than the first preset ambient temperature, the controller controls the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve to be opened.
8. An air conditioning system according to claim 3, wherein, The controller judges the ambient temperature when receiving a defrosting signal, and when the ambient temperature is lower than a second preset ambient temperature, the controller performs defrosting preparation control, wherein the controller controls the compressor to keep running at the current frequency, controls the first electromagnetic valve to be closed, the second electromagnetic valve and the third electromagnetic valve to be opened, oil output by an oil return port of the oil separator is returned to the compressor through an oil return branch and an oil return capillary tube, after the fourth preset time, the compressor controls the frequency of the compressor to be reduced, in the process of reducing the frequency of the compressor, when the frequency of the compressor is reduced to be smaller than the first preset frequency, the controller controls the first electromagnetic valve to be opened, the second electromagnetic valve and the third electromagnetic valve are closed, and when the difference between the pressure of an air outlet and the pressure of an air suction port of the compressor is smaller than a preset pressure difference or is prepared to control to be opened for a fifth preset time, the controller controls the four-way valve to be reversed, and the four-way valve is opened.
9. An air conditioning system according to claim 8, wherein, In the defrosting process, the controller controls the first electromagnetic valve to be opened, and the second electromagnetic valve and the third electromagnetic valve to be closed; After defrosting is finished, the four-way valve is switched into a heating mode, the controller controls the first electromagnetic valve and the second electromagnetic valve to be closed, the third electromagnetic valve to be opened, engine oil stored in the high-pressure oil storage tank is returned to the compressor through the oil return capillary tube, and after a sixth preset time, the controller controls the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve to be opened.
10. The air conditioning system of claim 4, wherein the air conditioning system comprises, The preset working modes comprise a defrosting mode, when the controller receives a defrosting signal, the controller judges the ambient temperature, and when the ambient temperature is not lower than a second preset ambient temperature, the controller controls the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve to be opened; The controller controls the frequency of the compressor to be reduced, and when the difference between the pressure of the exhaust port and the pressure of the air suction port of the compressor is smaller than a preset pressure difference or the frequency reduction time of the compressor reaches a seventh preset time, the controller controls the four-way valve to change direction and starts the defrosting process; In the defrosting process, the controller keeps the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve controlled by the controller to be opened; After defrosting is finished, the four-way valve is switched to a heating mode, and the controller controls the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve to be opened.

Description

Air conditioning system Technical Field The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioning system. Background In the oil return process of an air conditioning system, an oil separator is generally adopted to separate a refrigerant and engine oil output from a compressor, namely, the oil separator stores oil during normal operation, and the oil discharged by the compressor returns to the compressor through an oil return capillary, so that the following problems exist in the process of returning the engine oil in the oil separator to the compressor: firstly, in the starting stage of the compressor, particularly when the low-temperature heating sleep is started, the oil loading rate of the compressor is obviously increased, and the oil discharged by the compressor contains a large amount of refrigerant, so that less frozen oil is returned to the compressor through an oil return capillary after being separated by an oil separator, and the phenomenon of empty oil occurs; Secondly, during defrosting, before the four-way valve is switched, high and low pressure is balanced, the refrigerating machine oil stops flowing for a long time, meanwhile, the high pressure is rapidly reduced, the solubility in the refrigerating machine oil is greatly reduced, the refrigerant is separated out, the oil viscosity is increased, then an external fan is started, the refrigerating machine oil in the capillary tube is cooled, the oil viscosity is further increased, and therefore the phenomenon that the oil is blocked is caused, and the return oil of the return capillary tube is invalid. Disclosure of Invention The invention aims to provide an air conditioning system, which solves the problems that the existing air conditioning system in the prior art has the phenomenon of empty oil in the starting stage of a compressor, the viscosity of refrigerating machine oil in an oil return capillary tube is increased in defrosting, oil blockage is formed and the like. In order to achieve the aim of the invention, the invention is realized by adopting the following technical scheme: the present invention proposes an air conditioning system comprising: A refrigerant circuit for circulating a refrigerant through the compressor, the condenser, the expansion valve, and the evaporator; The oil separator is provided with an air inlet port, an air outlet port and an oil return port, wherein the air inlet port is connected with an air outlet of the compressor, the oil return port is connected with an air suction port of the compressor through an oil return main path, and a first electromagnetic valve is arranged on the oil return main path and used for controlling the on-off of the oil return main path; An oil return capillary is arranged between the oil return main path and the air suction port of the compressor, an oil return branch is also arranged between the oil return capillary and the oil return port, a high-pressure oil storage tank is arranged on the oil return branch, the installation height of the high-pressure oil storage tank is higher than that of the oil separator, a second electromagnetic valve and a third electromagnetic valve are arranged on the oil return branch, the second electromagnetic valve is positioned between the high-pressure oil storage tank and the oil return port, and the third electromagnetic valve is positioned between the high-pressure oil storage tank and the oil return capillary; And the controller is configured to control the opening and closing of the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, store the engine oil output from the oil return port in a high-pressure oil storage tank before a preset working mode, and open the oil return branch when the working mode is preset, so that the engine oil stored in the high-pressure oil storage tank is conveyed to the compressor through an oil return capillary tube. In some embodiments of the application, one of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger; the indoor heat exchanger and the outdoor heat exchanger are connected with the compressor through a four-way valve, the four-way valve comprises a first valve port, a second valve port, a third valve port and a fourth valve port, the first valve port is connected with the air outlet port, the second valve port is connected with one end of the indoor heat exchanger, the third valve port is connected with an air suction port of the compressor, and the fourth valve port is connected with one end of the outdoor heat exchanger. The first valve port can be selectively connected with the second valve port or the fourth valve port, and the third valve port is correspondingly connected with the fourth valve port or the second valve port; Specifically, in the heating mode, the first valve port is connected with the second valve port, the third valve port