CN103344059B - Secondary throttling middle complete cooling variable flow two-stage compression refrigerating system - Google Patents
Secondary throttling middle complete cooling variable flow two-stage compression refrigerating system Download PDFInfo
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- 230000006835 compression Effects 0.000 title claims abstract description 43
- 238000007906 compression Methods 0.000 title claims abstract description 43
- 238000001816 cooling Methods 0.000 title claims abstract description 20
- 239000003507 refrigerant Substances 0.000 claims abstract description 39
- 238000005057 refrigeration Methods 0.000 claims abstract description 33
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 238000004378 air conditioning Methods 0.000 description 7
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
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- 235000013305 food Nutrition 0.000 description 2
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- 230000033228 biological regulation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 235000013611 frozen food Nutrition 0.000 description 1
- 230000008676 import Effects 0.000 description 1
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Abstract
本发明公开了一种二次节流中间完全冷却变流量双级压缩制冷系统，而提供一种多台压缩冷凝机组并联，通过改变制冷剂流量而进行制冷量调节的制冷系统。包括并联在低压吸气管路和中压供液管路之间的多组变流量双级压缩冷凝机组，每组变流量双级压缩冷凝机组包括低压定流量压缩机、低压变流量压缩机、高压变流量压缩机、第一单向阀、第二单向阀、冷凝器、节流阀及中间冷却器组成。低压定流量压缩机排气口与第一单向阀进口连接，低压变流量压缩机排气口与第二单向阀进口连接，第一单向阀出口与第二单向阀出口并联后与中间冷却器液面下方进口连接，中间冷却器气体出口与高压变流量压缩机吸气口连接，高压变流量压缩机排气口与冷凝器进口连接。
The invention discloses a two-stage compression refrigeration system with secondary throttling, intermediate complete cooling and variable flow rate, and provides a refrigeration system in which multiple compression condensing units are connected in parallel and the refrigeration capacity is adjusted by changing the refrigerant flow rate. It includes multiple sets of variable flow two-stage compression condensing units connected in parallel between the low-pressure suction pipeline and the medium-pressure liquid supply pipeline. Each set of variable flow two-stage compression condensing units includes a low-pressure constant-flow compressor, a low-pressure variable-flow compressor, Composed of a high-pressure variable flow compressor, a first one-way valve, a second one-way valve, a condenser, a throttle valve and an intercooler. The outlet of the low-pressure constant-flow compressor is connected to the inlet of the first check valve, the outlet of the low-pressure variable-flow compressor is connected to the inlet of the second check valve, and the outlet of the first check valve is connected in parallel with the outlet of the second check valve. The inlet below the liquid surface of the intercooler is connected, the gas outlet of the intercooler is connected to the suction port of the high-pressure variable-flow compressor, and the exhaust port of the high-pressure variable-flow compressor is connected to the inlet of the condenser.
Description
技术领域technical field
本发明涉及制冷技术领域，特别是涉及一种通过改变制冷剂流量而进行制冷量调节的二次节流中间完全冷却双级压缩制冷系统。The invention relates to the technical field of refrigeration, in particular to a double-throttling intermediate complete cooling two-stage compression refrigeration system for adjusting the cooling capacity by changing the flow rate of the refrigerant.
背景技术Background technique
现有用于冻藏冷库的双级压缩制冷系统通常采用温度控制压缩机的开停，当冷库温度达到温控器设置温度时，制冷系统停止工作；当温度上升到温控器设置温度上限时，制冷系统开启。这样的系统存在一个矛盾，当需要开停机温差比较大时，会造成冻藏冷库中存放食品由于冻结率不同带来的食品失水干耗，食品品质下降；当需要开停机温差比较小时，制冷系统开通频繁，不但耗电量增加，而且也会降低制冷系统的使用寿命。此外现有双级压缩制冷系统高、低压容积比为固定的1:3或1:2，对于冷凝温度不断变化的制冷系统，由于高、低压容积比不可调，制冷系统不是在最佳状况下工作。The existing two-stage compression refrigeration system used for freezing cold storage usually uses temperature control to start and stop the compressor. When the temperature of the cold storage reaches the temperature set by the thermostat, the refrigeration system stops working; when the temperature rises to the upper limit set by the thermostat, The cooling system is on. There is a contradiction in such a system. When the temperature difference between startup and shutdown is relatively large, the food stored in the frozen storage will lose water and dryness due to different freezing rates, and food quality will decline; when the temperature difference between startup and shutdown is relatively small, refrigeration The frequent opening of the system will not only increase the power consumption, but also reduce the service life of the refrigeration system. In addition, the existing two-stage compression refrigeration system has a fixed high-pressure and low-pressure volume ratio of 1:3 or 1:2. For refrigeration systems with changing condensing temperatures, since the high-pressure and low-pressure volume ratios cannot be adjusted, the refrigeration system is not in the best condition. Work.
目前，通过改变制冷剂流量来实现制冷量控制的系统主要是多联式空调系统，多联式空调系统由多台压缩冷凝机组和多台室内蒸发器组成，系统通过改变制冷剂流量来实现制冷量的控制，系统运行灵活，易于控制，广泛应用于空调领域。但现有多联空调系统都是单级压缩制冷系统，制冷温度较高，只适用于空调领域，不适用于温度较低的冻藏冷库系统。At present, the system that realizes cooling capacity control by changing the refrigerant flow rate is mainly a multi-connected air-conditioning system. The multi-connected air-conditioning system is composed of multiple compression condensing units and multiple indoor evaporators. Quantity control, flexible system operation, easy to control, widely used in the field of air conditioning. However, the existing multi-connected air-conditioning systems are all single-stage compression refrigeration systems with relatively high refrigeration temperatures, which are only applicable to the field of air-conditioning, not to cold storage systems with low temperatures.
发明内容Contents of the invention
本发明的目的是针对现有技术中存在的技术缺陷，而提供一种多台压缩冷凝机组并联，通过改变制冷剂流量而进行制冷量调节的二次节流中间完全冷却变流量双级压缩制冷系统。The object of the present invention is to address the technical defects in the prior art, and provide a two-stage compression refrigeration system with secondary throttling, intermediate complete cooling, variable flow, and variable flow rate, in which multiple compression condensing units are connected in parallel and the cooling capacity is adjusted by changing the refrigerant flow rate. system.
为实现本发明的目的所采用的技术方案是：The technical scheme adopted for realizing the purpose of the present invention is:
一种二次节流中间完全冷却变流量双级压缩制冷系统，包括并联在低压吸气管路和中压供液管路之间的多组变流量双级压缩冷凝机组，每组所述变流量双级压缩冷凝机组由低压定流量压缩机、低压变流量压缩机、高压变流量压缩机、第一单向阀、第二单向阀、冷凝器、节流阀及中间冷却器组成；每组所述变流量双级压缩冷凝机组中的所述低压定流量压缩机和所述低压变流量压缩机吸气口并联同时与所述低压吸气管路连接，每组所述变流量双级压缩冷凝机组中的所述中间冷却器液体出口与所述中压供液管路连接；所述低压定流量压缩机排气口与所述第一单向阀进口连接，所述低压变流量压缩机排气口与所述第二单向阀进口连接，所述第一单向阀出口与所述第二单向阀出口并联后与所述中间冷却器液面下方进口连接，所述中间冷却器气体出口与所述高压变流量压缩机吸气口连接，所述高压变流量压缩机排气口与所述冷凝器进口连接，所述冷凝器出口通过所述节流阀与所述中间冷却器进口连接；当冻藏冷库负荷较小时，所述低压变流量压缩机与高压变流量压缩机同时工作；当冻藏冷库负荷较大时，所述低压定流量压缩机、低压变流量压缩机和高压变流量压缩机同时工作；需要低制冷剂流量时，所述低压变流量压缩机和高压变流量压缩机同时工作，所述低压定流量压缩机停机；需要中间制冷剂流量时，所述低压定流量压缩机和高压变流量压缩机同时工作，所述低压变流量压缩机停机；需要高制冷剂流量时，所述低压定流量压缩机、高压变流量压缩机和低压变流量压缩机同时工作。A two-stage throttling intermediate complete cooling variable flow two-stage compression refrigeration system, including multiple sets of variable flow two-stage compression condensing units connected in parallel between the low-pressure suction pipeline and the medium-pressure liquid supply pipeline, each set of variable flow two-stage compression condensing units The flow two-stage compression condensing unit is composed of a low-pressure constant-flow compressor, a low-pressure variable-flow compressor, a high-pressure variable-flow compressor, a first check valve, a second check valve, a condenser, a throttle valve and an intercooler; The low-pressure constant-flow compressor and the suction port of the low-pressure variable-flow compressor in the variable-flow two-stage compression condensing unit of the group are connected in parallel to the low-pressure suction pipeline at the same time, and each group of the variable-flow two-stage The liquid outlet of the intercooler in the compression condensing unit is connected to the medium-pressure liquid supply pipeline; the exhaust port of the low-pressure constant-flow compressor is connected to the inlet of the first check valve, and the low-pressure variable-flow compressor The machine exhaust port is connected to the inlet of the second one-way valve, the outlet of the first one-way valve is connected in parallel with the outlet of the second one-way valve, and then connected to the inlet below the liquid level of the intercooler, and the intercooler The gas outlet of the high pressure variable flow compressor is connected to the suction port of the high pressure variable flow compressor, the exhaust port of the high pressure variable flow compressor is connected to the inlet of the condenser, and the outlet of the condenser is connected to the intercooler through the throttle valve. When the load of the freezer is small, the low-pressure variable-flow compressor and the high-pressure variable-flow compressor work at the same time; when the load of the freezer is large, the low-pressure constant-flow compressor and the low-pressure variable-flow compressor work simultaneously with the high-pressure variable-flow compressor; when low refrigerant flow is required, the low-pressure variable-flow compressor and the high-pressure variable-flow compressor work simultaneously, and the low-pressure constant-flow compressor stops; when intermediate refrigerant flow is required, the The low-pressure constant-flow compressor and the high-pressure variable-flow compressor work at the same time, and the low-pressure variable-flow compressor stops; when high refrigerant flow is required, the low-pressure constant-flow compressor, high-pressure variable-flow compressor and low-pressure variable-flow compressor simultaneously Work.
所述低压变流量压缩机和高压变流量压缩机为涡旋压缩机、转子压缩机、螺杆压缩机、活塞压缩机中的任一种，采用交流变频、直流变频或卸载-加载时间控制方式进行变制冷剂流量的调节。The low-pressure variable-flow compressor and the high-pressure variable-flow compressor are any one of scroll compressors, rotor compressors, screw compressors, and piston compressors, which are controlled by AC frequency conversion, DC frequency conversion, or unloading-loading time. Variable refrigerant flow regulation.
所述节流阀为电子膨胀阀、热力膨胀阀、毛细管或孔板。The throttle valve is an electronic expansion valve, a thermal expansion valve, a capillary or an orifice.
所述中间冷却器为板式换热器或套管式换热器。The intercooler is a plate heat exchanger or a casing heat exchanger.
所述低压定流量压缩机为涡旋压缩机、转子压缩机、螺杆压缩机、活塞压缩机中的任一种。The low-pressure constant-flow compressor is any one of a scroll compressor, a rotary compressor, a screw compressor, and a piston compressor.
与现有技术相比，本发明的有益效果是：Compared with prior art, the beneficial effect of the present invention is:
1、节能：本发明的双级压缩制冷系统中，低压级压缩机由低压定流量压缩机和低压变流量压缩机组成，可以根据所需的制冷剂流量控制相应压缩机的启动或停止，通过改变制冷剂流量而进行制冷量调节，从而满足各种负荷对制冷量的要求，制冷系统不会频繁开启。同时通过改变高、低压压缩机输出的制冷剂流量，克服了现有技术中固定高、低压容积比的缺点，无论工况怎样变化，制冷系统总是处于最佳状态工作，达到节能的目的。由于采用双机压缩，制冷温度低，适用于温度较低的冻藏冷库系统。1. Energy saving: In the two-stage compression refrigeration system of the present invention, the low-pressure stage compressor is composed of a low-pressure constant-flow compressor and a low-pressure variable-flow compressor, and the start or stop of the corresponding compressor can be controlled according to the required refrigerant flow. The cooling capacity is adjusted by changing the refrigerant flow rate, so as to meet the cooling capacity requirements of various loads, and the refrigeration system will not be opened frequently. At the same time, by changing the refrigerant flow rate output by the high and low pressure compressors, the shortcomings of the fixed high and low pressure volume ratios in the prior art are overcome. No matter how the working conditions change, the refrigeration system is always working in the best state to achieve the purpose of energy saving. Due to the use of dual compressors, the refrigeration temperature is low, and it is suitable for freezing cold storage systems with low temperatures.
2、冻藏冷库温度恒定：由于可以调整制冷系统的制冷剂流量，系统可以根据冻藏冷库的负荷变化自动调整制冷剂流量，达到设定温度后制冷系统会以较低的制冷剂流量工作，维持冻藏冷库温度，避免了冻藏冷库内部温度的波动，有效地减少了由于温度波动带来的冻藏食品的失水干耗。2. The temperature of the frozen storage is constant: since the refrigerant flow of the refrigeration system can be adjusted, the system can automatically adjust the refrigerant flow according to the load change of the frozen storage. After reaching the set temperature, the refrigeration system will work at a lower refrigerant flow. Maintaining the temperature of the freezer freezer avoids fluctuations in the internal temperature of the freezer freezer and effectively reduces the dehydration and dry consumption of frozen food caused by temperature fluctuations.
3、制造成本低：可采用一台定频空调压缩机和两台变频空调压缩机配组组成变流量双级压缩冷凝机组，制造成本比现有单机头双级压缩冷凝机组或由低温压缩机配组组成的双级压缩冷凝机组低。3. Low manufacturing cost: A variable-flow two-stage compression condensing unit can be composed of one fixed-frequency air-conditioning compressor and two variable-frequency air-conditioning compressors. The two-stage compression condensing unit composed of matching groups is low.
4、模块化：高压压缩机和低压压缩机可采用同样额定输入功率的压缩机，有利于系统的调整且便于维修和保养，同时更容易实现系统的模块化。4. Modularization: High-pressure compressors and low-pressure compressors can use compressors with the same rated input power, which is conducive to system adjustment and easy repair and maintenance, and it is easier to realize system modularization.
附图说明Description of drawings
图1所示为本发明二次节流中间完全冷却变流量双级压缩制冷系统的示意图。FIG. 1 is a schematic diagram of a two-stage compression refrigeration system with secondary throttling and intermediate complete cooling and variable flow in the present invention.
图中：1.低压吸气管路，2.中压供液管路，3.低压定流量压缩机，4.低压变流量压缩机，5.高压变流量压缩机，6-1.第一单向阀，6-2.第二单向阀，7.冷凝器，8.节流阀，9.中间冷却器。In the figure: 1. Low-pressure suction pipeline, 2. Medium-pressure liquid supply pipeline, 3. Low-pressure constant-flow compressor, 4. Low-pressure variable-flow compressor, 5. High-pressure variable-flow compressor, 6-1. First One-way valve, 6-2. Second one-way valve, 7. Condenser, 8. Throttle valve, 9. Intercooler.
具体实施方式Detailed ways
以下结合附图和具体实施例对本发明作进一步详细说明。The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
图1所示为本发明二次节流中间完全冷却变流量双级压缩制冷系统的示意图，包括并联在低压吸气管路1和中压供液管路2之间的多组变流量双级压缩冷凝机组。每组所述变流量双级压缩冷凝机组包括低压定流量压缩机3、低压变流量压缩机4、高压变流量压缩机5、第一单向阀6-1、第二单向阀6-2、冷凝器7、节流阀8及中间冷却器9组成。每组所述变流量双级压缩冷凝机组中的所述低压定流量压缩机3和所述低压变流量压缩机4吸气口并联同时与所述低压吸气管路1连接，每组所述变流量双级压缩冷凝机组中的所述中间冷却器9液体出口与所述中压供液管路2连接。所述低压定流量压缩机3排气口与所述第一单向阀6-1进口连接，所述低压变流量压缩机4排气口与所述第二单向阀6-2进口连接，所述第一单向阀6-1出口与所述第二单向阀6-2出口并联后与所述中间冷却器9液面下方进口连接，所述中间冷却器9气体出口与所述高压变流量压缩机5吸气口连接，所述高压变流量压缩机5排气口与所述冷凝器7进口连接，所述冷凝器7出口通过所述节流阀8与所述中间冷却器9进口连接。Fig. 1 is a schematic diagram of the double-throttling intermediate complete cooling variable flow two-stage compression refrigeration system of the present invention, including multiple groups of variable flow two-stages connected in parallel between the low-pressure suction pipeline 1 and the medium-pressure liquid supply pipeline 2 Compression condensing unit. Each set of variable flow two-stage compression condensing units includes a low-pressure constant-flow compressor 3, a low-pressure variable-flow compressor 4, a high-pressure variable-flow compressor 5, a first check valve 6-1, and a second check valve 6-2. , condenser 7, throttle valve 8 and intercooler 9. The low-pressure constant-flow compressor 3 and the low-pressure variable-flow compressor 4 suction ports in each group of the variable-flow two-stage compression condensing unit are connected in parallel with the low-pressure suction pipeline 1 at the same time. The liquid outlet of the intercooler 9 in the variable flow two-stage compression condensing unit is connected with the medium pressure liquid supply pipeline 2 . The exhaust port of the low-pressure constant-flow compressor 3 is connected to the inlet of the first one-way valve 6-1, the exhaust port of the low-pressure variable-flow compressor 4 is connected to the inlet of the second one-way valve 6-2, The outlet of the first one-way valve 6-1 is connected in parallel with the outlet of the second one-way valve 6-2 and then connected to the inlet below the liquid level of the intercooler 9, and the gas outlet of the intercooler 9 is connected to the high-pressure The suction port of the variable flow compressor 5 is connected, the exhaust port of the high-pressure variable flow compressor 5 is connected to the inlet of the condenser 7, and the outlet of the condenser 7 is connected to the intercooler 9 through the throttle valve 8 import connection.
由冻藏冷库回到二次节流中间完全冷却变流量双级压缩制冷系统的低压蒸气制冷剂经低压吸气管路1进入到低压定流量压缩机3和低压变流量压缩机4中进行一级压缩，压缩后的中压过热蒸气制冷剂分别经第一单向阀6-1和第二单向阀6-2从中间冷却器9液面下方进口进入中间冷却器9的液体中被液体冷却至饱和状态，从中间冷却器9气体出口出来的中压饱和蒸气制冷剂进入高压变流量压缩机5中进行第二级压缩，压缩后的高压过热蒸气制冷剂经冷凝器7冷凝为高压液体制冷剂，在节流阀8中节流为中压饱和气液两相制冷剂后进入中间冷却器9中，中压饱和蒸气制冷剂参与第二级压缩，中压饱和液体制冷剂则经中压供液管路2向冻藏冷库供液。The low-pressure vapor refrigerant of the variable-flow two-stage compression refrigeration system is completely cooled from the frozen storage room back to the middle of the secondary throttling, and enters the low-pressure constant-flow compressor 3 and the low-pressure variable-flow compressor 4 through the low-pressure suction pipeline 1 for one cycle. stage compression, the compressed medium-pressure superheated vapor refrigerant passes through the first check valve 6-1 and the second check valve 6-2 respectively, enters the liquid in the intercooler 9 from below the liquid level of the intercooler 9, and is absorbed by the liquid in the intercooler 9. After cooling to a saturated state, the medium-pressure saturated vapor refrigerant from the gas outlet of the intercooler 9 enters the high-pressure variable flow compressor 5 for second-stage compression, and the compressed high-pressure superheated vapor refrigerant is condensed into a high-pressure liquid by the condenser 7 Refrigerant, throttling in throttle valve 8, becomes medium-pressure saturated gas-liquid two-phase refrigerant and then enters intercooler 9, medium-pressure saturated vapor refrigerant participates in the second-stage compression, and medium-pressure saturated liquid refrigerant The pressure liquid supply pipeline 2 supplies liquid to the freezer.
当冻藏冷库负荷较小时，低压变流量压缩机4与高压变流量压缩机5同时工作，通过调整高压变流量压缩机5、低压变流量压缩机4的制冷剂流量实现系统最佳高、低压容积比；当冻藏冷库负荷较大时，低压定流量压缩机3、低压变流量压缩机4和高压变流量压缩机5同时工作，通过调节低压变流量压缩机4和高压变流量压缩机5的制冷剂流量，实现系统最佳高、低压容积比。制冷系统由小制冷剂流量向大制冷剂流量过渡分为三个阶段：需要低制冷剂流量时，低压变流量压缩机4和高压变流量压缩机5同时工作，低压定流量压缩机3停机；需要中间制冷剂流量时，低压定流量压缩机3和高压变流量压缩机5同时工作，低压变流量压缩机4停机；需要高制冷剂流量时，低压定流量压缩机3、高压变流量压缩机5和低压变流量压缩机4同时工作。通过并联连接的变流量双级压缩冷凝机组组成的二次节流中间完全冷却变流量双级压缩制冷系统可以满足各种负荷对制冷剂流量的要求。When the load of the frozen storage is small, the low-pressure variable-flow compressor 4 and the high-pressure variable-flow compressor 5 work at the same time, and the optimal high and low pressure of the system can be realized by adjusting the refrigerant flow of the high-pressure variable-flow compressor 5 and the low-pressure variable-flow compressor 4 Volume ratio; when the load of the frozen storage is large, the low-pressure constant-flow compressor 3, the low-pressure variable-flow compressor 4, and the high-pressure variable-flow compressor 5 work at the same time, by adjusting the low-pressure variable-flow compressor 4 and the high-pressure variable-flow compressor 5 The refrigerant flow rate can achieve the best high and low pressure volume ratio of the system. The refrigeration system is divided into three stages from small refrigerant flow to large refrigerant flow: when low refrigerant flow is required, low-pressure variable-flow compressor 4 and high-pressure variable-flow compressor 5 work simultaneously, and low-pressure constant-flow compressor 3 stops; When intermediate refrigerant flow is required, low-pressure constant-flow compressor 3 and high-pressure variable-flow compressor 5 work simultaneously, and low-pressure variable-flow compressor 4 stops; when high refrigerant flow is required, low-pressure constant-flow compressor 3 and high-pressure variable-flow compressor 5 and low pressure variable flow compressor 4 work simultaneously. The secondary throttling intermediate complete cooling variable flow two-stage compression refrigeration system composed of variable flow two-stage compression condensing units connected in parallel can meet the requirements of various loads for refrigerant flow.
所述第一单向阀6-1和第二单向阀6-2的作用是，当低压定流量压缩机3工作时，第二单向阀6-2防止制冷剂经低压变流量压缩机4回流；当低压定变流量压缩机4工作时，第一单向阀6-1防止制冷剂经低压定流量压缩机3回流。The function of the first one-way valve 6-1 and the second one-way valve 6-2 is that when the low-pressure constant-flow compressor 3 is working, the second one-way valve 6-2 prevents the refrigerant from passing through the low-pressure variable-flow compressor. 4 Backflow; when the low-pressure constant-flow compressor 4 is working, the first one-way valve 6-1 prevents the refrigerant from backflowing through the low-pressure constant-flow compressor 3 .
本发明所述低压定流量压缩机为涡旋压缩机、转子压缩机、螺杆压缩机、活塞压缩机任一种，或其它型式压缩机。所述低压变流量压缩机和所述高压变流量压缩机为涡旋压缩机、转子压缩机、螺杆压缩机、活塞压缩机任一种，或其它型式压缩机，变流量方式可以是通过对交流电机的变频或通过对直流电机的变电压进行调节，也可以采用制冷剂卸载-加载时间控制方式实现制冷剂的流量调节。所述冷凝器为风冷冷凝器、水冷冷凝器、蒸发式冷凝器或其它型式冷凝器。所述节流阀为电子膨胀阀、热力膨胀阀、毛细管或孔板节流中的任一种，也可以是其它可降低制冷剂压力的节流装置。所述中间冷却器可以是板式换热器、套管式换热器或其它型式换热器。The low-pressure constant-flow compressor of the present invention is any one of a scroll compressor, a rotor compressor, a screw compressor, a piston compressor, or other types of compressors. The low-pressure variable-flow compressor and the high-pressure variable-flow compressor are scroll compressors, rotary compressors, screw compressors, piston compressors, or other types of compressors. The frequency conversion of the motor or the adjustment of the variable voltage of the DC motor can also be used to control the flow of the refrigerant by using the refrigerant unloading-loading time control method. The condenser is an air-cooled condenser, a water-cooled condenser, an evaporative condenser or other types of condensers. The throttling valve is any one of electronic expansion valve, thermal expansion valve, capillary or orifice throttling, or other throttling devices that can reduce the pressure of the refrigerant. The intercooler may be a plate heat exchanger, a casing heat exchanger or other types of heat exchangers.
本发明的变流量双级压缩制冷系统在具体运用时，高压压缩机和低压压缩机可采用同样额定输入功率的压缩机，有利于系统的调整且便于维修和保养，同时更容易实现系统的模块化。When the variable-flow two-stage compression refrigeration system of the present invention is used in practice, the high-pressure compressor and the low-pressure compressor can use compressors with the same rated input power, which is beneficial to system adjustment and is easy to repair and maintain, and it is easier to realize system modules change.
以上所述仅是本发明的优选实施方式，应当指出的是，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the protection scope of the present invention.
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