CN209978429U - Heat pump air conditioning unit capable of controlling temperature of lubricating oil - Google Patents
Heat pump air conditioning unit capable of controlling temperature of lubricating oil Download PDFInfo
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- CN209978429U CN209978429U CN201920572242.6U CN201920572242U CN209978429U CN 209978429 U CN209978429 U CN 209978429U CN 201920572242 U CN201920572242 U CN 201920572242U CN 209978429 U CN209978429 U CN 209978429U
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Abstract
The utility model relates to a can control heat pump air conditioning unit of lubricating oil temperature, including compressor, oil separator, cross valve, outdoor heat exchanger, off-premises station electronic expansion valve, vapour and liquid separator and cooler etc. make the lubricating oil that is separated out in the oil separator flows in the cooler, and with flowing through the refrigerant of heat exchange tube carries out the heat exchange and cools down, flows back the compressor again to, can in time and accurate control backward flow compressor's lubricating oil temperature and return oil volume eliminate the potential safety hazard of harm compressor, improve the security and the reliability of unit operation.
Description
Technical Field
The utility model relates to an air conditioning system, especially a heat pump air conditioning unit, specific heat pump air conditioning unit that can control the lubricating oil temperature that says so.
Background
With the popularization of air conditioning systems, the temperature of high-temperature weather lasting days is longer and longer, the working environment of the air conditioner is worse and worse, and the running reliability of the air conditioner in the high-temperature environment is more and more important. When the lubricating oil is in a high-temperature environment for a long time, the deterioration and the deterioration lose the lubricating effect, the formed oil film is too thin and cannot protect the inside of the compressor, and further the bearing abrasion of the compressor and the cylinder clamping of the scroll are caused. These all can influence user's use and experience, harm the reliability of air conditioner, shorten life. At present, most of the existing air conditioner oil return systems adopt an oil separator and then connect a capillary tube for throttling, and the oil return temperature cannot be controlled, so that the problem of controlling the temperature of lubricating oil is urgently needed to be solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at prior art not enough, provide a can control heat pump air conditioning unit of lubricating oil temperature, can be according to air conditioning system running state and environment, in time and accurate control backward flow compressor's lubricating oil temperature, eliminate the potential safety hazard of endangering the compressor, make unit operation safe and reliable.
The technical scheme of the utility model is that:
a heat pump air conditioning unit capable of controlling the temperature of lubricating oil comprises an outdoor unit and an indoor unit, wherein the outdoor unit and the indoor unit are connected through a liquid pipe and an air pipe; the outdoor unit comprises a refrigerant circulating loop consisting of a compressor, an oil separator, a four-way valve, an outdoor heat exchanger, an outdoor unit electronic expansion valve and a gas-liquid separator; the heat exchanger comprises a refrigerant evaporation side inlet, a refrigerant evaporation side outlet, a lubricating oil outlet and a lubricating oil inlet, and is internally provided with a heat exchange tube connected with the refrigerant evaporation side inlet and the refrigerant evaporation side outlet; the inlet at the evaporation side of the refrigerant is connected to the liquid pipe after passing through a cooling electronic expansion valve and a cooling electromagnetic valve which are mutually connected in series through a pipeline; the outlet at the evaporation side of the refrigerant is connected to a gas-liquid separator of an air conditioner through a pipeline; the lubricating oil outlet is connected to the bottom of an oil separator of an air conditioner through a pipeline; the lubricating oil inlet is connected to the air suction port of the compressor after passing through the main oil return electromagnetic valve through a pipeline, so that the lubricating oil separated from the oil separator flows into the cooler, exchanges heat with the refrigerant flowing through the heat exchange tube to reduce the temperature, and then flows back to the compressor.
Furthermore, the oil separator is connected to a pipeline between the gas-liquid separator and the compressor through an oil return pipe, and an auxiliary oil return electromagnetic valve is arranged on the oil return pipe, so that oil return of the compressor can be enhanced.
Further, a first temperature sensor is arranged at the lubricating oil inlet; a second temperature sensor is arranged at an air suction port of the compressor; and a third temperature sensor is arranged on the oil return pipe.
The utility model has the advantages that:
the utility model relates to a rationally, implement the convenience, can be according to air conditioning system running state and environment, in time and accurate control backward flow compressor's lubricating oil temperature and oil return volume eliminate the potential safety hazard of harm compressor, improve the security and the reliability of unit operation.
Drawings
Fig. 1 is a schematic diagram of the system structure of the present invention.
Wherein: 1-a compressor; 2-an oil separator; 3-a four-way valve; 4-outdoor heat exchanger; 5-an indoor unit; 6-gas-liquid separator; 7-a cooler; 8-main oil return solenoid valve; 9-auxiliary oil return electromagnetic valve; 10-outdoor electronic expansion valve; 11-cooling the electronic expansion valve; 12-cooling the solenoid valve; 13-a first temperature sensor; 14-a second temperature sensor; 15-a third temperature sensor; 16-a liquid tube; 17-trachea.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1.
A heat pump air conditioning unit capable of controlling the temperature of lubricating oil comprises an outdoor unit and an indoor unit 5, wherein the outdoor unit and the indoor unit 5 are connected through a liquid pipe 16 and an air pipe 17; the outdoor unit comprises a refrigerant circulation loop consisting of a compressor 1, an oil separator 2, a four-way valve 3, an outdoor heat exchanger 4, an outdoor unit electronic expansion valve 10 and a gas-liquid separator 6. The heat exchanger further comprises a cooler 7, wherein the cooler 7 comprises a refrigerant evaporation side inlet, a refrigerant evaporation side outlet, a lubricating oil outlet and a lubricating oil inlet, and a heat exchange tube connected with the refrigerant evaporation side inlet and the refrigerant evaporation side outlet is arranged in the cooler 7. The refrigerant evaporation side inlet is connected to the liquid pipe 16 through a pipeline after passing through a cooling electronic expansion valve 11 and a cooling solenoid valve 12 which are connected in series with each other. The refrigerant evaporation side outlet is connected to the gas-liquid separator 6 by a pipe. The lubricating oil outlet is connected to the bottom of the oil separator 2 through a pipeline; the lubricating oil inlet is connected to the air suction port of the compressor 1 after passing through a main oil return electromagnetic valve 8 through a pipeline, so that the lubricating oil separated from the oil separator 2 flows into the cooler 7, exchanges heat with the refrigerant flowing through the heat exchange tube to reduce the temperature, and then flows back to the compressor 1; preferably, the cooler 7 may be a Danfoss plate heat exchanger, model number B3-014-20-4.5-H.
The oil separator 2 is connected to a pipeline between the gas-liquid separator 6 and the compressor 1 through an oil return pipe, and an auxiliary oil return electromagnetic valve 9 is arranged on the oil return pipe, so that oil return of the compressor 1 can be enhanced.
The lubricating oil inlet is provided with a first temperature sensor 13 which can detect the temperature T1 of the lubricating oil flowing out of the oil separator 2. The suction port of the compressor 1 is provided with a second temperature sensor 14 which detects the temperature T2 of the lubricating oil flowing back to the compressor 1. The oil return pipe is provided with a third temperature sensor 15 which can measure the temperature T3 of the lubricating oil flowing out of the oil separator 2 during the reinforced oil return period.
The utility model discloses during the operation, the refrigerant is compressed into the highly compressed refrigerant of high temperature in the compressor to get into oil separator together with the partial lubricating oil in the compressor. After being separated by the oil separator, the lubricating oil at the bottom enters a cooler and returns to the compressor after being subjected to temperature regulation. The separated refrigerant is discharged from the oil separator and then enters the four-way valve, after being cooled by the outdoor unit heat exchanger, the refrigerant enters the indoor unit through the liquid pipe, then enters the gas-liquid separator through the four-way valve through the gas pipe for gas-liquid separation, and finally, the gaseous refrigerant returns to the compressor to start circulation again.
The cooler can obtain cold energy by evaporating and cooling the refrigerant from the electronic expansion valve, and exchange heat with lubricating oil in the cooler to control the temperature of the lubricating oil.
Specifically, the utility model discloses a control method, including following step:
1) in the initial state, the cooling electronic expansion valve and the cooling electromagnetic valve are both closed, the main oil return electromagnetic valve is opened, and the auxiliary oil return electromagnetic valve is closed;
2) detecting a temperature T1 of the lubricating oil entering the cooler by a first temperature sensor;
3) if T1 is more than 100 ℃, the cooling electromagnetic valve is opened, and the cooling electronic expansion valve is opened to the initial opening degree of 100P; otherwise, returning to the step 2);
4) detecting the temperature T2 of the lubricating oil flowing back to the compressor through a second temperature sensor; calculating Δ T = T1-T2;
5) if the delta T is more than 0 ℃, opening the cooling electronic expansion valve by 8P every 40S, and opening the cooling electronic expansion valve to 480P at the maximum; otherwise, keeping the current opening degree of the cooling electronic expansion valve;
6) continuing to detect T1;
7) if T1 is less than 95 ℃, the cooling electronic expansion valve is reduced by 8P every 40S, and the minimum cooling electronic expansion valve is opened to 100P; otherwise, turning to the step 5);
8) continuing to detect T1;
9) if T1 is less than 90 ℃, closing the cooling electronic expansion valve and the cooling electromagnetic valve; otherwise, turning to step 6);
10) return to step 1).
In order to guarantee the safe operation of compressor, the utility model discloses still including strengthening the oil return process, its method is: the auxiliary oil return electromagnetic valve 9 is opened once every two hours and the method comprises the following steps:
a) opening an auxiliary oil return electromagnetic valve, and detecting the temperature T3 of the lubricating oil at the tail end of an oil return pipe through a third temperature sensor;
b) if the temperature T3-T2 is higher than 15 ℃ and the temperature T2 is higher than 50 ℃, keeping opening the auxiliary oil return electromagnetic valve for 2min and turning to the step c); otherwise, turning to the step d);
c) continuing to detect T3, if T3-T2 is less than 5 ℃, closing the auxiliary oil return electromagnetic valve, otherwise turning to the step d);
d) the auxiliary oil return electromagnetic valve is kept opened for 4min and then closed.
The utility model discloses the part that does not relate to all is the same with prior art or can adopt prior art to realize.
Claims (3)
1. A heat pump air conditioning unit capable of controlling the temperature of lubricating oil comprises an outdoor unit and an indoor unit, wherein the outdoor unit and the indoor unit are connected through a liquid pipe and an air pipe; the outdoor unit comprises a refrigerant circulating loop consisting of a compressor, an oil separator, a four-way valve, an outdoor heat exchanger, an outdoor unit electronic expansion valve and a gas-liquid separator, and is characterized by also comprising a cooler, wherein the cooler comprises a refrigerant evaporation side inlet, a refrigerant evaporation side outlet, a lubricating oil outlet and a lubricating oil inlet, and a heat exchange tube connected with the refrigerant evaporation side inlet and the refrigerant evaporation side outlet is arranged in the cooler; the inlet at the evaporation side of the refrigerant is connected to the liquid pipe after passing through a cooling electronic expansion valve and a cooling electromagnetic valve which are mutually connected in series through a pipeline; the outlet at the evaporation side of the refrigerant is connected to a gas-liquid separator of an air conditioner through a pipeline; the lubricating oil outlet is connected to the bottom of an oil separator of an air conditioner through a pipeline; the lubricating oil inlet is connected to the air suction port of the compressor after passing through the main oil return electromagnetic valve through a pipeline, so that the lubricating oil separated from the oil separator flows into the cooler, exchanges heat with the refrigerant flowing through the heat exchange tube to reduce the temperature, and then flows back to the compressor.
2. The heat pump air conditioning unit according to claim 1, wherein the oil separator is connected to a pipeline between the gas-liquid separator and the compressor through an oil return pipe, and an auxiliary oil return solenoid valve is provided on the oil return pipe to enhance oil return to the compressor.
3. The heat pump air conditioning unit capable of controlling the temperature of the lubricating oil as claimed in claim 2, wherein a first temperature sensor is provided at the lubricating oil inlet; a second temperature sensor is arranged at an air suction port of the compressor; and a third temperature sensor is arranged on the oil return pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920572242.6U CN209978429U (en) | 2019-04-25 | 2019-04-25 | Heat pump air conditioning unit capable of controlling temperature of lubricating oil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920572242.6U CN209978429U (en) | 2019-04-25 | 2019-04-25 | Heat pump air conditioning unit capable of controlling temperature of lubricating oil |
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| CN209978429U true CN209978429U (en) | 2020-01-21 |
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| CN201920572242.6U Active CN209978429U (en) | 2019-04-25 | 2019-04-25 | Heat pump air conditioning unit capable of controlling temperature of lubricating oil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916106A (en) * | 2019-04-25 | 2019-06-21 | 南京天加环境科技有限公司 | A kind of heat pump air conditioner unit that can control lubricating oil temperature and its control method |
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2019
- 2019-04-25 CN CN201920572242.6U patent/CN209978429U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916106A (en) * | 2019-04-25 | 2019-06-21 | 南京天加环境科技有限公司 | A kind of heat pump air conditioner unit that can control lubricating oil temperature and its control method |
| CN109916106B (en) * | 2019-04-25 | 2024-02-27 | 南京天加环境科技有限公司 | Heat pump air conditioner unit capable of controlling temperature of lubricating oil and control method thereof |
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