CN210861760U - Natural cooling refrigerating system - Google Patents

Abstract

The utility model discloses a natural cooling refrigeration system, aiming at providing an energy-saving, high-efficiency and stable natural cooling refrigeration system, the technical scheme is that the device comprises a compressor, wherein an oil separator is communicated with the compressor, the oil separator is respectively communicated with a first filter and an air-cooled condenser, the compressor is communicated with the first filter, the compressor, the oil separator and the first filter form a first loop, the air-cooled condenser is communicated with a second filter, the bottom of the second filter is communicated with a flash evaporation type economizer, the flash evaporation type economizer is communicated with the compressor, the oil separator, the air-cooled condenser, the second filter and the flash evaporation type economizer form a second loop, the flash evaporation type economizer is communicated with an evaporator, a natural cooling system is arranged on the evaporator, a water path of the natural cooling system is communicated with a water path of the evaporator in series or in parallel, and the natural cooling system is of an integral structure or an external separation structure.

Description

A natural cooling refrigeration system

technical field

The utility model relates to the technical field of refrigeration systems, in particular to a natural cooling refrigeration system.

Background technique

The refrigeration system consists of refrigerant and four major parts, namely compressor, condenser, expansion valve, and evaporator. Generally, the refrigeration principle of refrigerator The function of the compressor is to compress the vapor with lower pressure into vapor with higher pressure. The volume of the steam is reduced, the pressure is increased, the compressor sucks the lower pressure working medium steam from the evaporator, and the pressure is increased and then sent to the condenser, where it is condensed into a liquid with a higher pressure, After being throttled by the throttling valve, it becomes a liquid with a lower pressure, and then is sent to the evaporator, where it absorbs heat and evaporates to become a steam with a lower pressure, and then is sent to the inlet of the compressor to complete the refrigeration cycle.

At present, the Chinese Patent Publication No. CN 108131853 A discloses a refrigeration system, which includes a compressor, a condenser, a throttling device and an evaporator, and the compressor, the condenser, the throttling device and the evaporator are sequentially connected to form a circulation loop , characterized in that the refrigeration system further includes: a booster component arranged between the condenser and the throttling device, the booster component is used to increase the pressure of the refrigerant flowing through it, and the booster component and the compressor are connected by pipes , the refrigerant flows through the power supply and motor of the compressor through pipes to cool the power supply and motor of the compressor.

Although this refrigeration system can solve the problem that the flow of liquid refrigerant is reduced and the compressor cannot be cooled under the condition of low pressure ratio in the existing refrigeration system, the refrigeration system is still not energy-saving, efficient and stable enough to independently control refrigeration. The independent work of some components in the system cannot guarantee a relatively stable supply temperature of chilled water throughout the year.

Utility model content

In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a natural cooling refrigeration system.

The above-mentioned technical purpose of the present utility model is achieved through the following technical solutions:

A natural cooling refrigeration system includes a compressor, an oil separator is communicated with the compressor, a first filter and an air-cooled condenser are respectively communicated with the oil separator, and the compressor communicates with the first filter , the compressor, the oil separator and the first filter form a first circuit, the air-cooled condenser is connected with a second filter, and the bottom of the second filter is connected with a flash economizer, the The flash economizer is communicated with the compressor, the compressor, the oil separator, the air-cooled condenser, the second filter and the flash economizer form a second loop, and the flash economizer is connected with an evaporation The evaporator is provided with a natural cooling system, and the natural cooling system includes a natural cooling coil, a natural cooling coil assembly, a water inlet pipeline, a water outlet pipeline, a plate heater, a first water pump, a second water pump, Linear three-way valve, the water circuit of the natural cooling system and the water circuit of the evaporator are connected in series or in parallel, the natural cooling system is an integral structure or an externally separated structure, and the natural cooling system is connected to the The first waterway stop valve on the water inlet pipeline and the second waterway stop valve arranged on the water outlet pipeline.

Further, the natural cooling coil is installed on the outside of the air-cooled condenser, and the natural cooling coil is completely attached to the surface of the air-cooled condenser.

Further, the natural cooling coil assembly is of an external type relative to the air-cooled condenser, the evaporator is connected to the plate heat exchanger, and the first water circuit stop valve and the second water circuit stop valve are connected to the natural cooling coil. The first water pump is connected to the second waterway shut-off valve, and the linear three-way valve is installed on the water outlet pipeline.

Further, the first waterway stop valve is connected to the linear three-way valve, the linear three-way valve is also connected to the plate heat exchanger and the second waterway stop valve, and the first water pump is arranged between the second waterway stop valve and the second waterway stop valve. Between the linear three-way valves, the linear three-way valve is installed on the water inlet pipeline.

Further, the second water pump is communicated between the evaporator and the plate heat exchanger.

Further, the linear three-way valve is connected to the evaporator, the linear three-way valve is connected to the first waterway stop valve and the second waterway stop valve, and the first water pump is arranged between the second waterway stop valve and the linear three-way valve. between the valves.

Further, the water circuit system of the natural cooling system and the water circuit system of the evaporator are connected in parallel.

Further, a first-stage electronic expansion valve is communicated between the second filter and the flash economizer, and a second-stage electronic expansion valve is communicated between the flash economizer and the evaporator, and the flash economizer communicates with a second-stage electronic expansion valve. A stop valve, a one-way valve and a third-stage electronic expansion valve are sequentially communicated between the steam economizer and the compressor.

The beneficial effects of the present utility model are:

(1) In this utility model, the overall design is reasonable, and the same water system structure is used as the base to derive a variety of connection structures of the natural cooling refrigeration system, including the water circuit of the natural cooling system and the water circuit of the evaporator are designed in series and parallel. The cooling system is of integral and external design, both of which can achieve better natural cooling effect.

(2) In this utility model, the system can provide a stable chilled water supply temperature throughout the year. If the ambient temperature is lower than the chilled water outlet temperature of the evaporator of the refrigeration system, the refrigeration system can be closed, that is, through the natural cooling coil. , the heat load can be dissipated to the environment, the water temperature is lowered, the high temperature water in the natural cooling coil and the low temperature air exchange heat, the temperature of the water is reduced to the outlet temperature of the chilled water, and the air is heated, and the heat is dissipated into the air.

(3) In this utility model, the natural cooling coil is connected in series or in parallel to the chilled water circuit pipeline of the water-side evaporator of the refrigeration system. The pre-cooling of chilled water and the supplement of cooling capacity reduce the cooling demand of the refrigeration system, and the whole system is energy-saving and efficient.

(4) In this utility model, the external natural cooling coil assembly can better independently control the air side condenser and natural cooling coil of the refrigeration system, and can independently ensure higher control of the fan of the natural cooling coil. Wind speed, so that the cooling capacity of the free cooling coil can be guaranteed, and at lower ambient temperature, the refrigeration system can be turned off and only the free cooling coil can be operated.

(5) In this utility model, a water pump is used in the water system to overcome the pressure loss of the natural cooling coil and its pipeline. of cooling capacity.

(6) In the present utility model, a waterway three-way valve is used in the waterway system to adjust the water flow rate of the bypass natural cooling coil, to adjust and control the water temperature, and then to control the refrigerating capacity of the natural cooling coil.

Description of drawings

Fig. 1 is the structural representation of natural cooling refrigeration system in embodiment 1;

Fig. 2 is the structural representation of natural cooling refrigeration system in embodiment 2;

Fig. 3 is the structural representation of natural cooling refrigeration system in embodiment 3;

Fig. 4 is the structural representation of natural cooling refrigeration system in embodiment 4;

FIG. 5 is a schematic structural diagram of the natural cooling refrigeration system in Embodiment 5. FIG.

In the figure, 1, compressor; 2, oil separator; 3, first filter; 4, air-cooled condenser; 5, first circuit; 6, second filter; 7, flash economizer; 8 , the second circuit; 9, the evaporator; 10, the natural cooling system; 101, the natural cooling coil; 102, the natural cooling coil assembly; 103, the water inlet pipe; 104, the water outlet pipe; 105, the plate heater; 106 , the first water pump; 107, the second water pump; 108, the linear three-way valve; 11, the first waterway stop valve; 12, the second waterway stop valve; 13, the first stage electronic expansion valve; 14, the second stage electronic expansion valve; 15, globe valve; 16, one-way valve; 17, third-stage electronic expansion valve.

Detailed ways

The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the embodiments with reference to FIG. 1 to FIG. 5 . The structural contents mentioned in the following embodiments are all referenced to the accompanying drawings.

Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

Example 1: A natural cooling refrigeration system, as shown in Figure 1, the compressor 1 is respectively connected with an oil separator 2, an evaporator 9 and a flash-type economizer 7, and one end of the oil separator 2 is connected to the air-cooled condenser. The compressor 1, the oil separator 2, and the first filter 3 form a first circuit 5. One end of the second filter 6 is connected to the air-cooled condenser 4, and the other end is connected to the air-cooled condenser 4. One end is connected to the flash economizer 7, the flash economizer 7 and the compressor 1 communicate with each other, the compressor 1, the oil separator 2, the air-cooled condenser 4, the second filter 6 and the flash economizer 7 The second circuit 8 is formed, and the first-stage electronic expansion valve 13 is installed between the second filter 6 and the flash economizer 7 .

The flash economizer 7 and the evaporator 9 communicate with each other, the second-stage electronic expansion valve 14 is installed between the flash economizer 7 and the evaporator 9, and the flash economizer 7 and the compressor 1 communicate with each other. Between the economizer 7 and the compressor 1, a shut-off valve 15, a one-way valve 16 and a third-stage electronic expansion valve 17 are sequentially connected, and a natural cooling system 10 is connected to the evaporator 9, and the natural cooling system 10 includes a natural cooling plate. Pipe 101, natural cooling coil assembly 102, water inlet pipe 103, water outlet pipe 104, plate heater 105, first water pump 106, second water pump 107 and linear three-way valve 108, water circuit and refrigeration of natural cooling coil 101 The water circuit of the system evaporator 9 is in series, the natural cooling coil 101 is installed on the outside of the air-cooled condenser 4, and the surfaces of the two are completely attached, the evaporator 9 is connected to the plate heat exchanger, and the first water circuit stop valve 11 is connected to. Linear three-way valve 108, the linear three-way valve 108 is connected to the plate heat exchanger and the second waterway stop valve 12, the first water pump 106 is installed between the second waterway stop valve 12 and the linear three-way valve 108, the linear three-way valve 108 is installed on the water inlet pipe 103.

The high temperature and high pressure exhaust gas of the compressor 1 flows through the oil separator 2, the lubricating oil is separated in the oil separator 2, the separated lubricating oil is returned to the compressor 1 through the first filter 3, and the exhaust gas enters the The air-cooled condenser 4 is condensed into a high-temperature and high-pressure refrigerant liquid, and then flows through the second filter 6 and the first-stage electronic expansion valve 13 to throttle and depressurize the mixture of refrigerant liquid and gas to medium-temperature and medium-pressure, and then flows into the air-cooled condenser 4. After the flash-type economizer 7, in the flash-type economizer 7, the gas is supplemented to the economizer air supply port of the compressor 1 through the shut-off valve 15, the check valve 16 and the electronic expansion valve in turn, and the gas is supplied to the economizer gas supply port of the compressor 1. In 7, the liquid flows through the second-stage electronic expansion valve 14, throttles to a mixture of low-temperature and low-pressure refrigerant liquid and gas, and then enters the evaporator 9. In the evaporator 9, the refrigerant absorbs the heat of the chilled water. The flash is gas, which is returned to the suction port of the compressor 1 through the suction pipe to complete a refrigeration cycle. The heat transfer generated by the reduction of the temperature of the chilled water is the cooling capacity.

The airflow generated by the fan flows through the natural cooling coil 101 and the air-cooled condenser 4 in series, and the length and width of the two heat exchangers are the same, so as to fit completely and avoid air leakage.

One side of the heat exchanger is the water inlet flow of the evaporator 9, and the other side is the natural cooling circuit. The purpose of the plate heat exchanger is to realize the heat transfer between the evaporator 9 water circuit of the refrigeration system and the natural cooling coil water circuit, and evaporation. The water path on one side of the evaporator 9 can be water, and the loop pipe of the natural cooling coil 101 may be water, ethylene glycol EG or PG solution, that is, the natural cooling coil 101 can operate below the freezing point, while the evaporator 9 still operates above the freezing point. , to ensure that the natural cooling coil 101 can still be operated at a lower ambient temperature to -30°C.

The linear three-way valve 108 is used to adjust the water flow into the natural cooling coil 101 and the water flow bypassing the natural cooling coil 101 to control the water temperature of the natural cooling coil 101 . A first water pump 106 is installed on the water path of the natural cooling coil 101 to ensure the circulation of the water path and overcome the pressure drop loss of the water path in the plate heat exchanger, the natural cooling coil 101 and the pipeline.

For example, the design requires the return water temperature of the chilled water of the evaporator 9 to be 18°C, the outlet temperature of the chilled water of the evaporator 9 to be 7°C, and the ambient temperature at this time is -5°C, and the chilled return water of the evaporator 9 flows through the plate exchange. Heater, through the plate heat exchanger, the high temperature return water of the evaporator 9 and the water circuit of the natural cooling coil 101 conduct heat exchange. In the natural cooling coil 101, the inlet water temperature of the natural cooling coil 101 is 15°C, and after the heat exchange with the ambient temperature of -5°C, the heat of the water is transferred to the air, and the water temperature is lowered, that is, the natural cooling coil 101 coil is heated. The outlet water temperature is reduced to 9°C. In the plate heat exchanger, the outlet water of the natural cooling coil 101 at 9°C can absorb the heat of the return water of the evaporator 9, so the return water temperature of the evaporator 9 is reduced from 18°C to 12°C , while the outlet water temperature of the natural cooling coil 101 increases to 15°C, the water at 12°C flows through the evaporator 9 and the temperature drops to 7°C, completing the water circuit circulation of the evaporator 9 and the water circuit circulation of the natural cooling coil 101 .

The impact on the data center requires year-round cooling applications, whether the ambient temperature in winter is low or the ambient temperature in summer is high, the refrigeration system operates in the refrigeration cycle to provide a stable chilled water supply temperature, such as 7°C water supply temperature , if the chilled water is a ethylene glycol solution, it can provide a water supply temperature of about -7°C. When operating at low ambient temperature, in order to ensure the minimum oil supply pressure difference of compressor 1, it is necessary to start and stop the fan or reduce the running speed of the fan to ensure the lowest condensing temperature. Therefore, even if the ambient temperature continues to decrease, the condensing temperature will also be lower. will not be further reduced, so the operating efficiency of the refrigeration system will not be further improved. At this time, if the ambient temperature is lower than the outlet temperature of the chilled water of the evaporator 9 of the refrigeration system, the refrigeration system can be shut down, that is, through the natural cooling coil 101 , the heat load can be dissipated to the environment, the water temperature is reduced, the high temperature water in the natural cooling coil 101 and the low temperature air conduct heat exchange, the temperature of the water is reduced to the outlet temperature of the chilled water, and the air is heated, and the heat is dissipated into the air .

Example 2: As shown in Figures 1 and 2, the water system of the evaporator 9 and the water system of the natural cooling coil 101 are connected in series, and a second water pump 107 is installed on the return pipe of the evaporator 9 to overcome the The pressure drop loss of the water path of the evaporator 9 flowing through the plate heat exchanger.

Example 3: As shown in Figures 1 and 3, the water circuit system of the evaporator 9 and the water circuit system of the natural cooling coil 101 are connected in series, but the direct connection method is adopted, eliminating the plate heat exchanger, that is, two water circuits The system is mixed flow, the linear three-way valve 108 is connected to the evaporator 9, the first waterway stop valve 11 and the second waterway stop valve 12, the first water pump 106 is installed in the second waterway stop valve 12 and the linear three-way valve 108 In between, the linear three-way valve 108 is installed on the water outlet pipeline 104 .

In the water circuit system, the water flow rate entering the natural cooling coil 101 is adjusted by the linear three-way valve 108 to control the heat transfer (refrigeration capacity) of the natural cooling coil 101. The water circuit system is equipped with a first water pump 106 to overcome the flow through the natural cooling coil. Pressure drop losses in coil 101 and piping. If plate heat exchange is not used, when it needs to operate at an ambient temperature below freezing point, the water circuit of evaporator 9 should use ethylene glycol EG or PG solution whose freezing point temperature is lower than 0 °C. There is no plate heat exchanger, there is no The heat transfer temperature difference of the evaporator 9 eliminates losses.

Embodiment 4: As shown in Figures 1 and 4, the water circuit system of the evaporator 9 and the water circuit system of the natural cooling coil 101 are connected in parallel, and the first water circuit stop valve 11 and the second water circuit stop valve 12 are used to realize the natural The cooling circuit is closed, the first water pump 106 is connected to the second water circuit stop valve 12, and the first water pump 106 is used to overcome the pressure drop loss on the water side.

Example 5: As shown in Figures 1 and 5, the natural cooling coil 101 is not installed on the outside of the air-cooled condenser 4 of the refrigeration system, but a natural cooling coil assembly 102 is externally installed. The natural cooling coil 101 is the same, the evaporator 9 is connected to the plate heat exchanger, the first water circuit stop valve 11 and the second water circuit stop valve 12 are connected to the external natural cooling coil assembly 102, and the first water pump 106 is connected to the second water circuit stop valve 11. The waterway stop valve 12 and the linear three-way valve 108 are installed on the water outlet pipeline 104 .

Under this circumstance, the air side condenser and the natural cooling coil 101 of the refrigeration system can be better independently controlled. For example, the integral natural cooling coil 101 is designed to give priority to the operation protection of the refrigeration system. In order to ensure sufficient oil supply pressure difference of the compressor 1, it is necessary to maintain a minimum condensing temperature. At this time, it can be improved by starting and stopping the fan or reducing the fan speed. condensation temperature. However, if the rotational speed of the fan decreases, the cooling capacity of the natural cooling coil 101 decreases. Then, if the design of the external natural cooling coil 101 is adopted, the control of the natural cooling coil 101 is independent of the control of the refrigeration system. For example, the fan speed of the free cooling coil 101 can be independently controlled to be higher, then the cooling capacity of the free cooling coil 101 can be guaranteed. At a lower ambient temperature, the refrigeration system can be turned off and only the free cooling coil can be operated. Tube 101.

The above is a further detailed description of the present utility model in conjunction with the specific embodiments, and it cannot be considered that the specific implementation of the present utility model is limited to this; Under the premise of the idea of the scheme, the expansion, the replacement of the operation method and the data should all fall within the protection scope of the present invention.

Claims (8)

1. A free-cooling refrigeration system comprising a compressor (1), characterized in that: the oil separator (2) is communicated with the compressor (1), the oil separator (2) is respectively communicated with the first filter (3) and the air-cooled condenser (4), the compressor (1) is communicated with the first filter (3), the compressor (1), the oil separator (2) and the first filter (3) form a first loop (5), the air-cooled condenser (4) is communicated with the second filter (6), the bottom of the second filter (6) is communicated with the flash evaporation type economizer (7), the flash evaporation type economizer (7) is communicated with the compressor (1), the oil separator (2), the air-cooled condenser (4), the second filter (6) and the flash evaporation type economizer (7) form a second loop (8), the flash evaporation type economizer (7) is communicated with the evaporator (9), and the evaporator (9) is provided with a natural cooling system (10), the natural cooling system (10) comprises a natural cooling coil (101), a natural cooling coil assembly (102), a water inlet pipeline (103), a water outlet pipeline (104), a plate heater (105), a first water pump (106), a second water pump (107) and a linear three-way valve (108), the water channel of the natural cooling system (10) is communicated with the water channel of the evaporator (9) in series or in parallel, the natural cooling system (10) is of an integral structure or an external separation structure, and the natural cooling system (10) is communicated with a first water channel stop valve (11) arranged on the water inlet pipeline (103) and a second water channel stop valve (12) arranged on the water outlet pipeline (104).

2. A free-cooling refrigeration system as set forth in claim 1 wherein: the natural cooling coil (101) is arranged on the outer side of the air-cooled condenser (4), and the surface of the natural cooling coil (101) is completely attached to the surface of the air-cooled condenser (4).

3. A free-cooling refrigeration system as set forth in claim 1 wherein: the natural cooling coil assembly (102) is external relative to the air-cooled condenser (4), the evaporator (9) is communicated with the plate heat exchanger, the first water path stop valve (11) and the second water path stop valve (12) are communicated with the natural cooling coil assembly (102), the first water pump (106) is communicated with the second water path stop valve (12), and the linear three-way valve (108) is installed on the water outlet pipeline (104).

4. A free-cooling refrigeration system as set forth in claim 2 wherein: first water route stop valve (11) communicate in linear three-way valve (108), linear three-way valve (108) still communicate in plate heat exchanger and second water route stop valve (12), first water pump (106) are located between second water route stop valve (12) and linear three-way valve (108), linear three-way valve (108) are installed on water inlet pipe (103).

5. A free-cooling refrigeration system as set forth in claim 4 wherein: and the second water pump (107) is communicated between the evaporator (9) and the plate heat exchanger.

6. A free-cooling refrigeration system as set forth in claim 2 wherein: the linear three-way valve (108) is communicated with the evaporator (9), the linear three-way valve (108) is communicated with the first waterway stop valve (11) and the second waterway stop valve (12), and the first water pump (106) is arranged between the second waterway stop valve (12) and the linear three-way valve (108).

7. A free-cooling refrigeration system as set forth in claim 2 wherein: and a water path system of the natural cooling system (10) is connected with a water path system of the evaporator (9) in parallel.

8. A free-cooling refrigeration system as set forth in claim 1 wherein: a first-stage electronic expansion valve (13) is communicated between the second filter (6) and the flash evaporation type economizer (7), a second-stage electronic expansion valve (14) is communicated between the flash evaporation type economizer (7) and the evaporator (9), and a stop valve (15), a one-way valve (16) and a third-stage electronic expansion valve (17) are sequentially communicated between the flash evaporation type economizer (7) and the compressor (1).

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