CN110411054B - Gas heat pump air conditioning system capable of reducing temperature of lubricating oil and control method - Google Patents
Gas heat pump air conditioning system capable of reducing temperature of lubricating oil and control method Download PDFInfo
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- CN110411054B CN110411054B CN201910614500.7A CN201910614500A CN110411054B CN 110411054 B CN110411054 B CN 110411054B CN 201910614500 A CN201910614500 A CN 201910614500A CN 110411054 B CN110411054 B CN 110411054B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/19—Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a gas heat pump air conditioning system capable of reducing the temperature of lubricating oil and a control method thereof. Also includes an oil cooler; the oil cooler comprises a closed cylinder body, wherein an oil inlet and an oil outlet communicated with the interior of the cylinder body are respectively arranged on the upper end surface and the lower end surface of the cylinder body; the oil inlet is communicated with the bottom of the oil separator; the oil outlet is communicated with the air suction pipe of the compressor; a coil pipe is arranged inside the cylinder body; the inlet end and the outlet end of the coil pipe respectively extend out of the cylinder; the outlet end is connected to the air inlet pipe of the gas-liquid separator; the inlet end is connected to a pipeline between the indoor unit heat exchanger and the outdoor unit heat exchanger. The invention effectively reduces the temperature of the lubricating oil and ensures the normal operation of the system by adjusting the opening of the auxiliary electronic expansion valve.
Description
Technical Field
The invention relates to an air conditioning system, in particular to a heat pump air conditioning system and a control method thereof, and particularly relates to a control method of a gas heat pump air conditioning system capable of reducing the temperature of lubricating oil.
Background
Lubricating oil is essential for normal operation of most air conditioning compressors, and oil shortage of the compressors can cause mechanical wear and damage to the compressors. The lubricant is usually miscible with the refrigerant, and when the refrigerant is compressed by the compressor, the temperature of the lubricant increases. The gas heat pump air conditioner is an air conditioning system which uses a gas engine to drive a compressor to run and completes refrigeration and heating cycles. Because the air conditioning system can recover the heat of the engine, the exhaust temperature of the gas heat pump air conditioning system is much higher than that of a common air conditioner, and the temperature of the lubricating oil of the compressor is relatively higher. The too high lubricating oil temperature can lead to viscosity reduction, index decay scheduling problem, moreover, the in-process that high temperature lubricating oil was got back to the compressor by the separation of oil separator, lubricating oil and external heat exchange, the temperature reduces gradually, can cause calorific loss.
At present, the lubricating oil is cooled mainly in a natural cooling mode, the effect is poor, the operation requirement of a gas heat pump is difficult to meet, and improvement is urgently needed.
Disclosure of Invention
The invention aims to solve the problems in the cooling aspect of lubricating oil at present, and provides a control method of a gas heat pump air conditioning system capable of reducing the temperature of the lubricating oil, which can effectively reduce the temperature of the lubricating oil, avoid the performance of the lubricating oil from being quickly attenuated, ensure the lubricating requirement of a compressor, and simultaneously improve the operating efficiency of the system by recovering the heat in the lubricating oil during heating operation.
The technical scheme of the invention is as follows:
a gas heat pump air conditioning system capable of reducing the temperature of lubricating oil comprises a refrigerant circulating loop formed by sequentially connecting a compressor, an oil separator, a four-way valve, an indoor unit heat exchanger, an outdoor unit heat exchanger and a gas-liquid separator. Also includes an oil cooler; the oil cooler comprises a closed cylinder body, wherein an oil inlet and an oil outlet communicated with the interior of the cylinder body are respectively arranged on the upper end surface and the lower end surface of the cylinder body; the oil inlet is communicated with the bottom of the oil separator; the oil outlet is communicated with the air suction pipe of the compressor; a coil pipe is arranged inside the cylinder body; the inlet end and the outlet end of the coil pipe respectively extend out of the cylinder; the outlet end is connected to the air inlet pipe of the gas-liquid separator; the inlet end is connected to a pipeline between the indoor unit heat exchanger and the outdoor unit heat exchanger; an oil temperature sensor is arranged at the oil outlet; and a pressure sensor is arranged on the air suction pipe of the gas-liquid separator.
Further, the compressor is driven by a gas engine.
Furthermore, the heat exchangers of the indoor units are connected in parallel; and one end of each indoor unit heat exchanger is provided with an indoor unit electronic expansion valve.
Furthermore, a main electronic expansion valve is arranged on a pipeline between the outdoor heat exchanger and the indoor heat exchanger.
Furthermore, an auxiliary electronic expansion valve is arranged at the inlet end of the coil pipe.
A control method of a gas heat pump air conditioning system capable of reducing the temperature of lubricating oil comprises the following steps:
1) and (3) refrigerating operation:
1.1) refrigerating and starting up, wherein the opening degree EV2 of the auxiliary electronic expansion valve is 0;
1.2) detecting the oil temperature TO through an oil temperature sensor; when the TO is more than or equal TO 90 ℃, turning TO the step 1.3); if TO is more than or equal TO 85 and less than 90 ℃, turning TO the step 1.4); when TO is more than or equal TO 80 and less than 85 ℃, turning TO the step 1.5); when the TO is less than 80 ℃, turning TO the step 1.6);
1.3) if the EV2=0 steps, opening the EV2 to the initial opening degree of 60 steps, then opening 8 steps every 2min, and maximally to 480 steps; if the EV2 is more than or equal to 60 steps, opening the step for 8 steps every 2min to reach 480 steps at most; turning to step 1.2);
1.4) EV2 keeps the current opening; turning to step 1.2);
1.5) if the EV2 is more than or equal to 60 steps, reducing the number of the steps by 8 steps every 2min to 60 steps at minimum; if EV2=0 step, keeping 0 step; turning to step 1.2);
1.6) if the EV2 is more than 60 steps, closing to 60 steps, and closing to 0 step after 2 min; if EV2=60 steps, closing to 0 step; turning to step 1.2);
2) heating operation:
2.1) heating and starting up, wherein the opening degree EV2 of the auxiliary electronic expansion valve is 60 steps;
2.2) detecting the low pressure LP of the system through a pressure sensor; when LP is less than or equal to 3Bar, turning to step 23); when LP is more than 3Bar and less than or equal to 3.5Bar, turning to step 24); when LP is more than 3.5 and less than or equal to 4Bar, turning to the step 25); when LP is more than 4Bar, turning to step 2.6);
2.3) if EV2=0 step, starting to the initial opening of 60 steps, then starting to 8 steps every 2min, and reaching the maximum to 480 steps; if the EV2 is more than or equal to 60 steps, opening the step for 8 steps every 2min to reach 480 at most; turning to step 2.2);
2.4) EV2 keeps the current opening; turning to step 2.2);
2.5) if the EV2 is more than or equal to 60 steps, reducing the number of the steps by 8 steps every 2min to 60 steps at minimum; if EV2=0 step, keeping 0 step; turning to step 2.2);
2.6) if EV2 is greater than 60 steps, reducing 8 steps every 2min to 60 steps at minimum; if EV2=60 steps, keeping 60 steps; go to step 2.2).
The invention has the beneficial effects that:
the invention has reasonable design, simple structure and convenient control, can effectively reduce the temperature of the lubricating oil, avoid the quick attenuation of the performance of the lubricating oil, ensure the lubricating requirement of the compressor, and simultaneously can improve the operating efficiency of the system by recovering the heat in the lubricating oil during the heating operation.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention.
FIG. 2 is a schematic view of the structure of an oil cooler of the present invention.
Wherein: 1-a compressor; 2-an oil separator; 3-a four-way valve; 4-outdoor heat exchanger; 5-main electronic expansion valve; 6-electronic expansion valve of indoor machine; 7-indoor heat exchanger; 8-a gas-liquid separator; 9-an oil cooler; 10-auxiliary electronic expansion valve; 11-an oil return pipe; 12-oil temperature sensor; 13-a pressure sensor; 14-gas engine.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1 and 2.
A gas heat pump air conditioning system capable of reducing the temperature of lubricating oil comprises a refrigerant circulation loop formed by sequentially connecting a compressor 1, an oil separator 2, a four-way valve 3, an indoor unit heat exchanger 7, an outdoor unit heat exchanger 4 and a gas-liquid separator 8. The compressor is driven by a gas engine. The heat exchangers of the indoor units are connected in parallel; and one end of each indoor unit heat exchanger is provided with an indoor unit electronic expansion valve, so that each indoor unit heat exchanger can be independently controlled conveniently. And a main electronic expansion valve is arranged on a pipeline between the outdoor heat exchanger and the indoor heat exchanger and can perform throttling operation on the refrigerant circulation loop.
Meanwhile, the invention also comprises an oil cooler 9. The oil cooler 9 comprises a closed cylinder 15, wherein an oil inlet 17 and an oil outlet 18 communicated with the inside of the cylinder are respectively arranged on the upper end surface and the lower end surface of the cylinder; the oil inlet 17 is communicated with the bottom of the oil separator 2; the oil outlet 18 is communicated with the suction pipe of the compressor 1 through an oil return pipe 11. The oil return pipe is provided with a capillary tube. A coil pipe 16 is arranged inside the cylinder body 15; the inlet and outlet ends of the coil 16 extend out of the barrel 15, respectively. Then, the outlet end is connected to the intake pipe of the gas-liquid separator 8, and the inlet end is connected to the pipe between the indoor heat exchanger 7 and the outdoor heat exchanger 4. An auxiliary electronic expansion valve 10 is arranged at the inlet end of the coil pipe 16, and can throttle the refrigerant flowing into the coil pipe 16. The oil outlet is also provided with an oil temperature sensor which can detect the oil outlet temperature. And a pressure sensor is arranged on an air suction pipe of the gas-liquid separator and can detect the system pressure.
The invention discloses a control method of a gas heat pump air conditioning system capable of reducing the temperature of lubricating oil, which comprises the following steps:
1) and (3) refrigerating operation:
1.1) refrigerating and starting up, wherein the opening degree EV2 of the auxiliary electronic expansion valve is 0;
1.2) detecting the oil temperature TO through an oil temperature sensor; when the TO is more than or equal TO 90 ℃, turning TO the step 1.3); if TO is more than or equal TO 85 and less than 90 ℃, turning TO the step 1.4); when TO is more than or equal TO 80 and less than 85 ℃, turning TO the step 1.5); when the TO is less than 80 ℃, turning TO the step 1.6);
1.3) if the EV2=0 steps, opening the EV2 to the initial opening degree of 60 steps, then opening 8 steps every 2min, and maximally to 480 steps; if the EV2 is more than or equal to 60 steps, opening the step for 8 steps every 2min to reach 480 steps at most; turning to step 1.2);
1.4) EV2 keeps the current opening; turning to step 1.2);
1.5) if the EV2 is more than or equal to 60 steps, reducing the number of the steps by 8 steps every 2min to 60 steps at minimum; if EV2=0 step, keeping 0 step; turning to step 1.2);
1.6) if the EV2 is more than 60 steps, closing to 60 steps, and closing to 0 step after 2 min; if EV2=60 steps, closing to 0 step; turning to step 1.2);
2) heating operation:
2.1) heating and starting up, wherein the opening degree EV2 of the auxiliary electronic expansion valve is 60 steps;
2.2) detecting the low pressure LP of the system through a pressure sensor; when LP is less than or equal to 3Bar, turning to step 2.3); when LP is more than 3Bar and less than or equal to 3.5Bar, turning to step 2.4); when LP is more than 3.5 and less than or equal to 4Bar, turning to the step 2.5); when LP is more than 4Bar, turning to step 2.6);
2.3) if EV2=0 step, starting to the initial opening of 60 steps, then starting to 8 steps every 2min, and reaching the maximum to 480 steps; if the EV2 is more than or equal to 60 steps, opening the step for 8 steps every 2min to reach 480 steps at most; turning to step 2.2);
2.4) EV2 keeps the current opening; turning to step 2.2);
2.5) if the EV2 is more than or equal to 60 steps, reducing the number of the steps by 8 steps every 2min to 60 steps at minimum; if EV2=0 step, keeping 0 step; turning to step 2.2);
2.6) if EV2 is greater than 60 steps, reducing 8 steps every 2min to 60 steps at minimum; if EV2=60 steps, keeping 60 steps; go to step 2.2).
The invention can effectively reduce the temperature of the lubricating oil, avoid the performance of the lubricating oil from being quickly attenuated and ensure the lubricating requirement of the compressor by adding the structures such as the oil cooler and the like, and can improve the operating efficiency of the system by recovering the heat in the lubricating oil during the heating operation.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (3)
1. A control method of a gas heat pump air conditioning system capable of reducing the temperature of lubricating oil is applied to a system which comprises a refrigerant circulating loop and an oil cooler, wherein the refrigerant circulating loop is formed by sequentially connecting a compressor, an oil separator, a four-way valve, an indoor unit heat exchanger, an outdoor unit heat exchanger and a gas-liquid separator; the oil cooler comprises a closed cylinder body, wherein an oil inlet and an oil outlet communicated with the interior of the cylinder body are respectively arranged on the upper end surface and the lower end surface of the cylinder body; the oil inlet is communicated with the bottom of the oil separator; the oil outlet is communicated with the air suction pipe of the compressor; a coil pipe is arranged inside the cylinder body; the inlet end and the outlet end of the coil pipe respectively extend out of the cylinder; the outlet end is connected to the air inlet pipe of the gas-liquid separator; the inlet end is connected to a pipeline between the indoor unit heat exchanger and the outdoor unit heat exchanger; an oil temperature sensor is arranged at the oil outlet; a pressure sensor is arranged on an air suction pipe of the gas-liquid separator; a main electronic expansion valve is arranged on a pipeline between the outdoor heat exchanger and the indoor heat exchanger; an auxiliary electronic expansion valve is arranged at the inlet end of the coil pipe; the method is characterized in that: the control method comprises the following steps:
1) and (3) refrigerating operation:
1.1) refrigerating and starting up, wherein the opening degree EV2 of the auxiliary electronic expansion valve is 0;
1.2) detecting the oil temperature TO through an oil temperature sensor; when the TO is more than or equal TO 90 ℃, turning TO the step 1.3); if TO is more than or equal TO 85 and less than 90 ℃, turning TO the step 1.4); when TO is more than or equal TO 80 and less than 85 ℃, turning TO the step 1.5); when the TO is less than 80 ℃, turning TO the step 1.6);
1.3) if the EV2=0 steps, opening the EV2 to the initial opening degree of 60 steps, then opening 8 steps every 2min, and maximally to 480 steps; if the EV2 is more than or equal to 60 steps, opening the step for 8 steps every 2min to reach 480 steps at most; turning to step 1.2);
1.4) EV2 keeps the current opening; turning to step 1.2);
1.5) if the EV2 is more than or equal to 60 steps, reducing the number of the steps by 8 steps every 2min to 60 steps at minimum; if EV2=0 step, keeping 0 step; turning to step 1.2);
1.6) if the EV2 is more than 60 steps, closing to 60 steps, and closing to 0 step after 2 min; if EV2=60 steps, closing to 0 step; turning to step 1.2);
2) heating operation:
2.1) heating and starting up, wherein the opening degree EV2 of the auxiliary electronic expansion valve is 60 steps;
2.2) detecting the low pressure LP of the system through a pressure sensor; when LP is less than or equal to 3Bar, turning to step 2.3); when LP is more than 3Bar and less than or equal to 3.5Bar, turning to step 2.4); when LP is more than 3.5 and less than or equal to 4Bar, turning to the step 2.5); when LP is more than 4Bar, turning to step 2.6);
2.3) if EV2=0 steps, then open to initial opening 60 steps, then open 8 steps every 2min, maximum to 480; if the EV2 is more than or equal to 60 steps, opening the step for 8 steps every 2min to reach 480 steps at most; turning to step 2.2);
2.4) EV2 keeps the current opening; turning to step 2.2);
2.5) if the EV2 is more than or equal to 60 steps, reducing the number of the steps by 8 steps every 2min to 60 steps at minimum; if EV2=0 step, keeping 0 step; turning to step 2.2);
2.6) if EV2 is greater than 60 steps, reducing 8 steps every 2min to 60 steps at minimum; if EV2=60 steps, keeping 60 steps; go to step 2.2).
2. The control method of the gas heat pump air conditioning system capable of reducing the temperature of the lubricating oil according to claim 1, characterized in that: the compressor is driven by a gas engine.
3. The control method of the gas heat pump air conditioning system capable of reducing the temperature of the lubricating oil according to claim 1, characterized in that: the heat exchangers of the indoor units are connected in parallel; and one end of each indoor unit heat exchanger is provided with an indoor unit electronic expansion valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910614500.7A CN110411054B (en) | 2019-07-09 | 2019-07-09 | Gas heat pump air conditioning system capable of reducing temperature of lubricating oil and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910614500.7A CN110411054B (en) | 2019-07-09 | 2019-07-09 | Gas heat pump air conditioning system capable of reducing temperature of lubricating oil and control method |
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| CN110411054B true CN110411054B (en) | 2021-02-02 |
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| CN111633464B (en) * | 2020-06-24 | 2024-12-06 | 璟赫系统科技(苏州)有限公司 | A cooling system for drilling machine |
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| CN110411054A (en) | 2019-11-05 |
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