CN115087319A - A pump-driven evaporative cooling air conditioning system for a data center and its oil return method - Google Patents

Abstract

The invention discloses a pump-driven evaporative cooling air-conditioning system for a data center and an oil return mode thereof, and the system comprises a first valve, a second valve, a third valve, an expansion valve, a gas-liquid separator, a compressor, an oil separator, a condenser, a heat regenerator, a low-pressure circulating liquid storage device and an evaporator, wherein an evaporator air inlet pipe is communicated between the low-pressure circulating liquid storage device and the evaporator, one end of a condenser main pipeline is arranged on the low-pressure circulating liquid storage device, and the other end of the condenser main pipeline sequentially passes through the expansion valve, the heat regenerator, the condenser, the oil separator, the compressor, the gas-liquid separator and the second valve and is provided with a compressor air suction pipe and an oil return pipe. The refrigerant pump drives the refrigerant at the tail end to flow, so that the lubricating oil attached to the air return pipe of the evaporator is more favorably brought back to the low-pressure circulating liquid storage device, and the oil return problem at the unfavorable tail end is effectively solved.

Description

A pump-driven evaporative cooling air-conditioning system for a data center and its oil return method

technical field

The invention belongs to the technical field of air conditioning and refrigeration systems, and particularly provides a pump-driven evaporative cooling air conditioning system for a data center and an oil return method thereof.

Background technique

With the rapid development of 5G mobile communications, cloud computing and big data, the number of data centers around the world has exceeded 8 million, consuming about 1.1% to 1.5% of global electricity consumption. Therefore, the energy saving needs of data centers are very urgent. In the total energy consumption of the data center, the energy consumption of air conditioning equipment accounts for about 40%. The traditional data center air conditioning system needs to run the compressor all year round, and there is a general problem of high system energy consumption. Heat pipe and vapor compression composite air conditioning system can comprehensively improve system performance, and is gradually applied to data center cooling projects.

However, in the condenser cooling mode, many heat pipes and vapor compression composite room cooling systems still use air-cooled cooling, resulting in low heat exchange efficiency. For the end system of the cooling system of the data center with a large number of evaporators and a relatively scattered arrangement, the liquid supply capacity of the compound air-conditioning system using the direct expansion liquid supply method is limited. The forced liquid supply system of the refrigerant pump is conducive to the uniform liquid distribution of each evaporator to achieve sufficient cooling. However, under high pressure, the refrigerant and the refrigeration oil are dissolved in a limited way, and it is difficult for the oil separator to completely separate all the refrigeration oil in the mixture of the refrigerant and the refrigeration oil at the compressor outlet. Therefore, after the high-pressure refrigerant enters the low-pressure circulation barrel through throttling, it often carries a part of the refrigeration oil. Due to the low temperature and low pressure environment in the low pressure circulating barrel, fluorine and the refrigerant are partially soluble in each other, and it is difficult to return the refrigeration oil. It is an important prerequisite for the stable operation of the system to continuously return the refrigeration oil accumulated in the low-pressure circulating barrel to the compressor.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention provides a pump-driven evaporative cooling air-conditioning system for a data center and an oil return method thereof.

Example 1

In order to achieve the above object, the technical scheme adopted in the present invention is: a pump-driven evaporative cooling air-conditioning system for a data center, comprising a first valve, a second valve, a third valve, an expansion valve, a gas-liquid separator, a compressor, an oil A separator, a condenser, a regenerator, a low-pressure circulating liquid accumulator, a refrigerant pump and an evaporator, an evaporator air intake pipe is communicated between the low-pressure circulating liquid accumulator and the evaporator, and the evaporator is provided with an evaporator One end of the evaporator return pipe, and the other end of the evaporator return pipe is set in the low-pressure circulation accumulator, and the low-pressure circulation accumulator is provided with one end of the condenser main pipeline, and the other end of the condenser main pipeline is sequentially After passing through the expansion valve, regenerator, condenser, oil separator, compressor, gas-liquid separator and the second valve, a compressor suction pipe and an oil return pipe are arranged, and the compressor suction pipe is arranged in the low-pressure circulating liquid storage In the condenser, the oil return pipe is arranged in the low-pressure circulation accumulator after passing through the regenerator and the third valve, and a condenser branch pipe is arranged outside the main condenser pipe, and the two ends of the condenser branch pipe are respectively connected to each other. A first valve is arranged on the condenser main pipeline to the outside of the oil separator and the outside of the second valve, and a first valve is arranged on the condenser branch pipeline, and the compressor and the oil separator are communicated through pipelines.

Further, it also includes a water level control valve, a drain valve, a filler, a water tank, a sprinkler head, a water pump and a water conduit, the water tank is installed on the lower side of the inner cavity of the condenser, and the drain valve is communicated with the water tank. The valve is assembled in the water tank, and the water level control valve is electrically connected with external control equipment through wires, the packing is assembled in the middle of the inner cavity of the condenser, the sprinkler head is assembled on the upper side of the inner cavity of the condenser, and the water conduit The two ends of the condenser are respectively connected to the water tank and the shower head, the water pump is arranged on the water conduit, and the upper side of the condenser is equipped with a fan.

Further, a liquid level gauge is also included, and the liquid level gauge is arranged on the low-pressure circulating liquid accumulator.

Further, the type of the liquid level gauge is a tuning fork vibration type, a maglev type, a pressure type, an ultrasonic type, a sonar wave type, a magnetic flap type or a radar type.

Further, the compressor suction pipe and the evaporator air return pipe are both located on the upper side of the inner cavity of the low-pressure circulation accumulator, the oil return pipe is located on the lower side of the inner cavity of the low-pressure circulation accumulator, and the lower end of the oil return pipe is uniform. There is an oil return hole.

Further, the type of the regenerator is a plate heat exchanger, a casing heat exchanger, a shell and tube heat exchanger, a cross-flow heat exchanger or a spiral plate heat exchanger.

Further, the type of the compressor is a screw type, scroll type, centrifugal type and other compressors containing lubricating oil, the compressor is equipped with an oil level sensor, and the type of the oil level sensor is a photoelectric oil level sensor. , capacitive oil level sensor or differential pressure oil level sensor.

Embodiment 2

An oil return method for a pump-driven evaporative cooling air-conditioning system in a data center is implemented by using a pump-driven evaporative cooling air-conditioning system for a data center as described in Embodiment 1. When the oil level in the compressor is lower than a safe value , close the first valve, open the second valve, the third valve and the expansion valve, open the refrigerant pump, the refrigerant pump drives the refrigerant to flow, and drives the lubricating oil accumulated on the inner wall of the evaporator to flow into the low-pressure circulating accumulator;

The multiple oil return holes on the oil return pipe evenly absorb the lubricating oil and liquid refrigerant in the low-pressure circulating accumulator, and the liquid refrigerant is vaporized through the regenerator, and then the gaseous refrigerant and lubricating oil will flow into the main circuit of the condenser At the same time, the suction pipe of the compressor guides the gaseous refrigerant in the low-pressure circulating accumulator to the main circuit of the condenser, the lubricating oil flows back to the compressor, and the gaseous refrigerant flows through the main circuit of the condenser and the condenser will accumulate in the main circuit The lubricating oil on the inner wall flows into the low pressure circulating accumulator.

Embodiment 3

Air-cooled heat-pipe mode. When the outdoor ambient temperature is low, close the second valve, the compressor and the third valve, open the first valve and the refrigerant pump, and the liquid refrigerant flows out from the low-pressure circulating accumulator and is driven by the refrigerant pump into the evaporator, where it communicates with the indoor air. The hot air becomes gas-liquid two-phase after heat exchange, and then flows through the evaporator return pipe and returns to the low-pressure circulation accumulator. The gas-liquid two-phase refrigerant is separated in the low-pressure circulation accumulator, and the gaseous refrigerant passes through the main circuit of the condenser. After passing through the condenser, it is converted into liquid refrigerant by heat exchange at the condenser, and finally flows back to the low-pressure circulating accumulator. In this mode, the frequency of the fluorine pump is adjusted according to the outlet air temperature of the cabinet, and the frequency of the condenser fan of the outdoor unit is adjusted according to the evaporating temperature. At the same time, the evaporating pressure should not be lower than a certain value.

Embodiment 4

Evaporative cooling heat pipe mode. When the outdoor ambient temperature is low and the air-cooled heat pipe mode cannot meet the heat load, on the basis of the third embodiment, the water pump is turned on. The liquid refrigerant flows out from the low-pressure circulating accumulator and is driven by the refrigerant pump to enter the evaporator. After exchanging heat with the indoor hot air, it becomes gas-liquid two-phase, and then flows through the return pipe of the evaporator and returns to the low-pressure circulating accumulator. The liquid two-phase refrigerant is separated in the low-pressure circulating accumulator, and the gaseous refrigerant passes through the condenser. In the condenser, the water pump is turned on to drive the water in the water tank to flow to the sprinkler head through the water conduit, and the sprayed water falls to the condenser in the condenser. On the main line, water cooling is realized, and at the same time, air cooling is realized by fans. With the cooperation of water cooling and air cooling, the gaseous refrigerant is converted into liquid refrigerant by heat exchange, and finally flows back to the low-pressure circulating accumulator. At the end of this mode, the water pump should be turned off and the drain valve should be opened to drain the water in the tank. In this mode, the frequency of the fluorine pump is adjusted according to the outlet air temperature of the cabinet, and the frequency of the condenser fan of the outdoor unit is adjusted according to the evaporating temperature. At the same time, the evaporating pressure should not be lower than a certain value.

Embodiment 5

Air-cooled vapor compression mode. When the outdoor ambient temperature is high, close the first valve and the third valve, open the second valve, the compressor and the refrigerant pump, the liquid refrigerant flows out from the low-pressure circulating accumulator, and is driven by the refrigerant pump to enter the evaporator. After the evaporator exchanges heat with the indoor hot air, it becomes gas-liquid two-phase, and then returns to the low-pressure circulating accumulator. The gaseous refrigerant in the low-pressure circulating accumulator passes through the gas-liquid separator, compressor, and oil separator in turn. The condenser exchanges heat, and then flows back to the low-pressure circulating accumulator after being throttled by the expansion valve. In this mode, the frequency of the fluorine pump is adjusted according to the outlet air temperature of the cabinet, the frequency of the outdoor unit compressor is adjusted according to the evaporation temperature, the frequency of the condenser fan is adjusted according to the condensation temperature, and the opening of the expansion valve is adjusted according to the liquid level.

Embodiment 6

Evaporative cooling vapor compression mode. When the outdoor ambient temperature is high and the air-cooled vapor compression mode cannot meet the heat load, on the basis of the fifth embodiment, the water pump is turned on. The liquid refrigerant flows out from the low-pressure circulating accumulator, and is driven by the refrigerant pump to enter the evaporator. After exchanging heat with the indoor hot air in the evaporator, it becomes gas-liquid two-phase, and then returns to the low-pressure circulating accumulator. The gaseous refrigeration in the liquid container enters the condenser through the gas-liquid separator, the compressor and the oil separator in turn. In the condenser, the water pump is turned on to drive the water in the water tank to flow to the sprinkler head through the water conduit, and the sprayed water falls into the condenser. In the main circuit of the condenser, water cooling is realized, and air cooling is realized by fans. With the cooperation of water cooling and air cooling, the gaseous refrigerant is converted into liquid refrigerant by heat exchange, and then flows back to the low-pressure circulating accumulator after being throttled by the expansion valve. At the end of this mode, the water pump should be turned off, and the drain valve should be opened to discharge the water in the water. In this mode, the frequency of the fluorine pump is adjusted according to the outlet air temperature of the cabinet, the frequency of the outdoor unit compressor is adjusted according to the evaporation temperature, the frequency of the condenser fan is adjusted according to the condensation temperature, and the opening of the expansion valve is adjusted according to the liquid level.

The beneficial effects of using the present invention are:

1. When the ambient temperature is low, turn on the refrigerant pump to run the heat pipe mode, which can make full use of the natural cold source to cool down, save the energy consumption of the compressor, and have a good energy saving effect.

2. When the air-cooled heat pipe mode cannot meet the cooling demand, the evaporative cooling mode is operated, which increases the applicable scope of the heat pipe mode and further realizes energy saving.

3. When the ambient temperature is high, the compressor and the refrigerant pump are turned on at the same time, and the vapor compression mode is operated. Provide sufficient cooling capacity for the room.

4. The liquid supply method of the refrigerant pump is conducive to the uniform liquid separation of multiple evaporators. The pressure head of the pump can effectively overcome the resistance along the refrigerant flow process and prevent the insufficient liquid supply of each evaporator at the end.

5. Solve the problem of oil return in the liquid supply system of the refrigerant pump. Through the oil return pipe, the refrigerated oil automatically flows into the compressor, and the regenerator can vaporize the refrigerant to prevent the compressor from liquid slamming when the liquid return volume is large. The refrigerant pump drives the flow of refrigerant at the end, which is more conducive to bringing the lubricating oil attached to the return pipe of the evaporator back to the low-pressure circulating accumulator, effectively solving the problem of oil return at the unfavorable end.

Description of drawings

FIG. 1 is a system diagram of the present invention.

Reference numerals include: 1, first valve, 2, second valve, 3, water level control valve, 4, blowdown valve, 5, third valve, 6, expansion valve, 7, gas-liquid separator, 8, compressor , 9, oil separator, 10, condenser, 11, packing, 12, water tank, 13, water pump, 14, regenerator, 15, low pressure circulating accumulator, 16, liquid level gauge, 17, refrigerant pump, 18, evaporator, 19, compressor suction pipe, 20, evaporator return pipe, 21, oil return pipe, 22, water conduit, 23, condenser main pipe, 24, condenser branch pipe, 25, evaporator intake pipe .

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

1 , a pump-driven evaporative cooling air conditioning system for a data center includes a first valve 1 , a second valve 2 , a third valve 5 , an expansion valve 6 , a gas-liquid separator 7 , a compressor 8 , and an oil separator 9 , condenser 10, regenerator 14, low pressure circulating liquid accumulator 15, refrigerant pump 17 and evaporator 18, the evaporator air intake pipe 25 is communicated between the low pressure circulating liquid accumulator 15 and the evaporator 18, and the evaporator 18 One end of the evaporator return pipe 20 is provided, and the other end of the evaporator return pipe 20 is arranged in the low-pressure circulation accumulator 15, and the low-pressure circulation accumulator 15 is provided with one end of the condenser main pipe 23, the condenser main pipe The other end of 23 passes through the expansion valve 6, the regenerator 14, the condenser 10, the oil separator 9, the compressor 8, the gas-liquid separator 7 and the second valve 2 in turn, and is provided with a compressor suction pipe 19 and an oil return pipe. 21, and the compressor suction pipe 19 is arranged in the low-pressure circulation accumulator 15, the oil return pipe 21 is arranged in the low-pressure circulation accumulator 15 after passing through the regenerator 14 and the third valve 5, and the condenser main pipe 23 is arranged outside There is a condenser branch pipe 24, the two ends of the condenser branch pipe 24 are respectively connected to the condenser main pipe 23 outside the oil separator 9 and the outside of the second valve 2, and the condenser branch pipe 24 is provided with the first valve 1 , the compressor 8 and the oil separator 9 are communicated through pipelines.

The condenser main circuit 23 and the oil return pipe 21 pass through the regenerator 14 to realize the heat exchange between the refrigerant at the outlet of the condenser 12 and the liquid refrigerant in the oil return pipe 21, so that the liquid refrigerant is vaporized and the oil return work is carried out smoothly.

Specifically, it also includes a water level control valve 3, a drain valve 4, a filler 11, a water tank 12, a sprinkler head, a water pump 13 and a water conduit 22. The water tank 12 is installed on the lower side of the inner cavity of the condenser 10, and the drain valve 4 is connected to The water tank 12 is connected, the water level control valve 3 is assembled in the water tank 12, and the water level control valve 3 is electrically connected with the external control equipment through wires, the filler 11 is assembled in the middle of the inner cavity of the condenser 10, and the sprinkler head is assembled in the condenser 10. On the upper side of the inner cavity, the two ends of the water conduit 22 are respectively connected to the water tank 12 and the shower head, and the water pump 13 is arranged on the water conduit 22, and the upper side of the condenser 10 is equipped with a fan.

Air cooling and water cooling can be performed at the condenser 10 at the same time to perform efficient heat exchange.

Specifically, the liquid level gauge 16 is also included, and the liquid level gauge 16 is arranged on the low-pressure circulating liquid accumulator 15 .

Specifically, the type of the liquid level gauge 16 is a tuning fork vibration type, a maglev type, a pressure type, an ultrasonic type, a sonar wave type, a magnetic flap type or a radar type. bit.

Specifically, the compressor suction pipe 19 and the evaporator return pipe 20 are both located on the upper side of the inner cavity of the low-pressure circulation accumulator 15 , the oil return pipe 21 is located on the lower side of the inner cavity of the low-pressure circulation accumulator 15 , and the oil return pipe 21 The lower end of the oil return hole is evenly opened.

The compressor suction pipe 19 and the evaporator return pipe 20 transport gaseous refrigerant, and the oil return pipe 21 uniformly absorbs the refrigeration oil and liquid refrigerant in the low-pressure circulating accumulator 15 through the oil return hole for oil recovery.

Specifically, the type of regenerator 14 is a plate heat exchanger, a casing heat exchanger, a shell and tube heat exchanger, a cross flow heat exchanger or a spiral plate heat exchanger for exchanging heat with a liquid refrigerant , which turns it into a gaseous refrigerant.

Specifically, the type of the compressor 8 is a screw type, scroll type, centrifugal type and other compressors containing lubricating oil, the compressor 8 is equipped with an oil level sensor, and the type of the oil level sensor is a photoelectric oil level sensor, a capacitive type Oil level sensor or differential pressure oil level sensor.

Embodiment 2

An oil return method for a pump-driven evaporative cooling air-conditioning system in a data center is implemented by a pump-driven evaporative cooling air-conditioning system in a data center as described in the first embodiment. When the oil level in the compressor 8 is lower than a safe value At this time, close the first valve 1, open the second valve 2, the third valve 5 and the expansion valve 6, open the refrigerant pump 17, the refrigerant pump 17 drives the refrigerant to flow, and drives the lubricating oil accumulated on the inner wall of the evaporator 18 to flow to the In the low-pressure circulating accumulator 15;

The multiple oil return holes on the oil return pipe 21 evenly absorb the lubricating oil and liquid refrigerant in the low-pressure circulating accumulator 15, and the liquid refrigerant is vaporized through the regenerator 14, and the gaseous refrigerant and lubricating oil will flow to the condenser. In the main line 23, at the same time, the compressor suction pipe 19 guides the gaseous refrigerant in the low-pressure circulating accumulator 15 into the condenser main line 23, the lubricating oil flows back into the compressor 8, and the gaseous refrigerant flows through the condenser main pipe The passage 23 and the condenser 10 flow the lubricating oil accumulated on the inner wall thereof to the low-pressure circulating accumulator 15 .

The above mode is the oil return mode, in which the liquid refrigerant is heated and vaporized by the high temperature side refrigerant in the regenerator 14 to prevent the compressor 8 from liquid hammer.

If the oil return volume is large, the third valve 5 can be adjusted to increase the oil return volume and increase the oil return speed. The refrigerant pump 17 drives the flow of the refrigerant to drive the oil accumulated on the tube wall to flow back to the low-pressure circulating accumulator 15. Effectively solve the problem of oil return at the end.

In this mode, the expansion valve 6 controls the liquid level to keep within a certain height range. When operating in the oil return mode, the compressor 8 gradually increases the frequency until the oil level alarm disappears and continues to operate normally.

Embodiment 3

When the outdoor ambient temperature is low, close the second valve 2 , the compressor 8 and the third valve 5 , open the first valve 1 and the refrigerant pump 17 , and the liquid refrigerant flows out from the low-pressure circulating accumulator 15 through the refrigerant pump 17 It is driven into the evaporator 18, and after heat exchange with the indoor hot air, it becomes a gas-liquid two-phase, and then flows through the evaporator return pipe 20, and returns to the low-pressure circulating accumulator 15. The gas-liquid two-phase refrigerant circulates in the low-pressure circulating accumulator. 15 separation, the gaseous refrigerant passes through the condenser 10 through the condenser main pipeline 23, and is converted into a liquid refrigerant by heat exchange at the condenser 10, and finally flows back to the low-pressure circulating accumulator 15.

The above mode is the air-cooled heat pipe mode. In this mode, the frequency of the fluorine pump is adjusted according to the outlet air temperature of the cabinet, and the frequency of the condenser fan of the outdoor unit is adjusted according to the evaporation temperature. At the same time, the evaporation pressure should not be lower than a certain value.

Embodiment 4

When the outdoor ambient temperature is low and the air-cooled heat pipe mode cannot meet the heat load, on the basis of the third embodiment, the water pump 13 is turned on. The liquid refrigerant flows out from the low-pressure circulating accumulator 15 and is driven by the refrigerant pump 17 into the evaporator 18. After exchanging heat with the indoor hot air, it becomes gas-liquid two-phase, and then flows through the evaporator return pipe 20 and returns to the low-pressure circulating accumulator. Liquidator 15, the gas-liquid two-phase refrigerant is separated in the low-pressure circulating liquid accumulator 15, and the gaseous refrigerant passes through the condenser 10. In the condenser 10, the water pump 13 is turned on to drive the water in the water tank 12 to flow to the sprinkler head through the water conduit 22 , the sprayed water falls on the condenser main circuit 23 in the condenser 10 to realize water cooling, and at the same time, air cooling is realized through the fan. With the cooperation of water cooling and air cooling, the gaseous refrigerant is converted into liquid refrigerant by heat exchange, and finally flows back to the low pressure Circulating reservoir 15.

The above mode is the evaporative cooling heat pipe mode. When the mode is ended, the water pump 13 should be turned off and the drain valve 4 should be opened to discharge the water in the water tank 12 .

In this mode, the frequency of the fluorine pump is adjusted according to the outlet air temperature of the cabinet, and the frequency of the condenser fan of the outdoor unit is adjusted according to the evaporating temperature. At the same time, the evaporating pressure should not be lower than a certain value.

Embodiment 5

When the outdoor ambient temperature is high, close the first valve 1 and the third valve 5, open the second valve 2, the compressor 8 and the refrigerant pump 17, the liquid refrigerant flows out from the low-pressure circulating accumulator 15, and passes through the refrigerant pump. 17 is driven into the evaporator 18, and in the evaporator 18, it changes into gas-liquid two-phase after heat exchange with the indoor hot air, and then returns to the low-pressure circulation accumulator 15, and the gaseous refrigerant in the low-pressure circulation accumulator 15 passes through the gas and The liquid separator 7 , the compressor 8 and the oil separator 9 enter the condenser 10 for heat exchange, and then flow back to the low-pressure circulating accumulator 15 after being throttled by the expansion valve 6 .

The above mode is the air-cooled vapor compression mode. In this mode, the frequency of the fluorine pump is adjusted according to the outlet air temperature of the cabinet, the frequency of the outdoor unit compressor is adjusted according to the evaporation temperature, the frequency of the condenser fan is adjusted according to the condensation temperature, and the opening of the expansion valve is adjusted according to the liquid level. .

Embodiment 6

When the outdoor ambient temperature is high and the air-cooled vapor compression mode cannot meet the heat load, on the basis of the fifth embodiment, the water pump 13 is turned on. The liquid refrigerant flows out from the low-pressure circulating accumulator 15, and is driven by the refrigerant pump 17 to enter the evaporator 18, where it exchanges heat with the indoor hot air in the evaporator 18 and changes into two-phase gas and liquid, and then returns to the low-pressure circulating accumulator. 15. The gaseous refrigeration in the low-pressure circulating accumulator 15 enters the condenser 10 through the gas-liquid separator 7, the compressor 8, and the oil separator 9 in sequence. In the condenser 10, the water pump 13 is turned on to drive the water in the water tank 12 to pass through the guide The water pipe 22 flows to the shower head, and the sprayed water falls on the condenser main circuit 23 in the condenser 10 to realize water cooling, and at the same time, air cooling is realized through the fan. Then, after being throttled by the expansion valve 6, it flows back to the low-pressure circulation accumulator 15.

The above-mentioned mode is the evaporative cooling vapor compression mode. When the mode is ended, the water pump 13 should be turned off, and the drain valve 4 should be opened to discharge the water in the water tank 12 at the same time.

In this mode, the frequency of the fluorine pump is adjusted according to the outlet air temperature of the cabinet, the frequency of the outdoor compressor 8 is adjusted according to the evaporation temperature, the frequency of the fan of the condenser 10 is adjusted according to the condensation temperature, and the opening of the expansion valve 6 is adjusted according to the liquid level.

The above contents are only preferred embodiments of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, many changes can be made in the specific embodiments and application scope, as long as these changes do not depart from the concept of the present invention, all It belongs to the protection scope of the present invention.

Claims (8)

1. The utility model provides a pump drive evaporative cooling air conditioning system for data center which characterized in that: the condenser comprises a first valve (1), a second valve (2), a third valve (5), an expansion valve (6), a gas-liquid separator (7), a compressor (8), an oil separator (9), a condenser (10), a heat regenerator (14), a low-pressure circulation liquid storage device (15), a refrigerant pump (17) and an evaporator (18), wherein an evaporator air inlet pipe (25) is communicated between the low-pressure circulation liquid storage device (15) and the evaporator (18), one end of an evaporator air return pipe (20) is arranged on the evaporator (18), the other end of the evaporator air return pipe (20) is arranged in the low-pressure circulation liquid storage device (15), one end of a condenser main pipeline (23) is arranged on the low-pressure circulation liquid storage device (15), and the other end of the condenser main pipeline (23) sequentially passes through the expansion valve (6), the heat regenerator (14), the condenser (10), the oil separator (9) and the expansion valve (6), Compressor (8), vapour and liquid separator (7) and second valve (2) are provided with compressor breathing pipe (19) and return oil pipe (21) back, and compressor breathing pipe (19) set up in low pressure circulation reservoir (15), return oil pipe (21) and set up in low pressure circulation reservoir (15) after regenerator (14) and third valve (5), condenser main line (23) outside is provided with condenser branch pipeline (24), the both ends of condenser branch pipeline (24) communicate respectively on condenser main line (23) in the oil separator (9) outside and second valve (2) outside, and be provided with first valve (1) on condenser branch pipeline (24), through the pipeline intercommunication between compressor (8) and oil separator (9).

2. A data center pump driven evaporative cooling air conditioning system as set forth in claim 1, wherein: still include water level control valve (3), blowoff valve (4), filler (11), basin (12), shower head, water pump (13) and aqueduct (22), basin (12) are installed in the inner chamber downside of condenser (10), and blowoff valve (4) are linked together with basin (12), water level control valve (3) assemble in basin (12), and water level control valve (3) are connected with external control equipment electricity through the wire, filler (11) assemble in the inner chamber middle part of condenser (10), the shower head assembles in the inner chamber upside of condenser (10), the both ends of aqueduct (22) are connected to basin (12) and shower head respectively, and water pump (13) set up on aqueduct (22), the upside of condenser (10) is equipped with the fan.

3. A data center pump driven evaporative cooling air conditioning system as set forth in claim 1, wherein: the device also comprises a liquid level meter (16), wherein the liquid level meter (16) is arranged on the low-pressure circulation liquid storage device (15).

4. A data center pump driven evaporative cooling air conditioning system as set forth in claim 3, wherein: the type of the liquid level meter (16) is a tuning fork vibration type, a magnetic suspension type, a pressure type, an ultrasonic wave type, a sonar wave type, a magnetic turning plate type or a radar type.

5. A data center pump driven evaporative cooling air conditioning system as set forth in claim 1, wherein: compressor breathing pipe (19) and evaporimeter muffler (20) all are located the upside of low pressure circulation reservoir (15) inner chamber, return oil pipe (21) are located the downside of low pressure circulation reservoir (15) inner chamber, and return oil pipe (21)'s lower extreme has evenly seted up the oil gallery.

6. A data center pump driven evaporative cooling air conditioning system as set forth in claim 1, wherein: the heat regenerator (14) is a plate heat exchanger, a double-pipe heat exchanger, a shell-and-tube heat exchanger, a cross-flow heat exchanger or a spiral plate heat exchanger.

7. A data center pump driven evaporative cooling air conditioning system as set forth in claim 1, wherein: the compressor (8) is of the type of a screw, scroll, centrifugal or other lubricant-containing compressor, and the compressor (8) is equipped with an oil level sensor of the photoelectric type, the capacitive type or the differential pressure type.

8. An oil return mode of a pump-driven evaporative cooling air conditioning system for a data center, which is realized by the pump-driven evaporative cooling air conditioning system for the data center according to claim 5, and is characterized in that: when the oil level liquid level in the compressor (8) is lower than a safety value, the first valve (1) is closed, the second valve (2), the third valve (5) and the expansion valve (6) are opened, the refrigerant pump (17) is opened, the refrigerant pump (17) drives the refrigerant to flow, and the lubricating oil accumulated on the inner wall of the evaporator (18) is driven to flow into the low-pressure circulation liquid storage device (15);

a plurality of oil return holes in the oil return pipe (21) uniformly absorb lubricating oil and liquid refrigerant in the low-pressure circulation liquid storage device (15), the liquid refrigerant is gasified through the heat regenerator (14), the gaseous refrigerant and the lubricating oil flow into the condenser main pipeline (23), meanwhile, the compressor air suction pipe (19) guides the gaseous refrigerant in the low-pressure circulation liquid storage device (15) into the condenser main pipeline (23), the lubricating oil flows back into the compressor (8), and the gaseous refrigerant flows through the condenser main pipeline (23) and the condenser (10) to flow the lubricating oil accumulated on the inner wall of the condenser main pipeline into the low-pressure circulation liquid storage device (15).

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