WO2015188656A1 - Two-stage compression air conditioning system and control method thereof - Google Patents

Two-stage compression air conditioning system and control method thereof Download PDF

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WO2015188656A1
WO2015188656A1 PCT/CN2015/076355 CN2015076355W WO2015188656A1 WO 2015188656 A1 WO2015188656 A1 WO 2015188656A1 CN 2015076355 W CN2015076355 W CN 2015076355W WO 2015188656 A1 WO2015188656 A1 WO 2015188656A1
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heat exchanger
interface
stage
throttling
air conditioning
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PCT/CN2015/076355
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French (fr)
Chinese (zh)
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李大伟
熊军
粱志滔
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珠海格力电器股份有限公司
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Priority to CN201410261178.1A priority Critical patent/CN104061705B/en
Priority to CN201410261178.1 priority
Application filed by 珠海格力电器股份有限公司 filed Critical 珠海格力电器股份有限公司
Publication of WO2015188656A1 publication Critical patent/WO2015188656A1/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B13/00Compression machines, plant or systems with reversible cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B47/00Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02Defrosting cycles

Abstract

A two-stage compression air conditioning system comprises a two-stage compressor (1), a four-way reversing valve (8), an outdoor heat exchanger (6), a first throttling device (5), a flash vaporizer (4), a second throttling device (3) and an indoor heat exchanger (2). The opening of the first and second throttling devices (5, 3) is adjustable. A bypass pipe (13), a heat accumulator (11) and a control valve are also comprised. The bypass pipe (13) is connected between the first end port of the outdoor heat exchanger (6) and an intake port of the two-stage compressor (1). A first heat exchanging pipe (11a) of the heat accumulator (11) is connected in series between an exhaust port of the two-stage compressor (1) and a first end port of the indoor heat exchanger (2), and a second heat exchanging pipe (11b) of the heat accumulator (11) is connected in series to the bypass pipe (13). The control valve is used to selectively conduct or interrupt the bypass pipe (13) and the pipe between the first end port of the outdoor exchanger (6) and the intake port of the two-stage compressor (1). A control method of the two-stage compression air conditioning system is also disclosed.

Description

双级压缩空调系统及其控制方法Two-stage compression air conditioning system and control method thereof 技术领域Technical field
本发明涉及空调技术领域,特别是涉及一种双级压缩空调系统及其控制方法。The invention relates to the technical field of air conditioners, in particular to a two-stage compressed air conditioning system and a control method thereof.
背景技术Background technique
目前,带闪蒸器的双级压缩空调系统的中间补气量不可调节,当压缩机采用相同的频率时,系统中其它参数的变化可能导致中间补气量的波动,使压缩机到运行状态偏离最佳效率点,造成压缩机不能在最佳效率点运行。At present, the intermediate air supply of the two-stage compressed air conditioning system with flasher is not adjustable. When the compressor adopts the same frequency, the change of other parameters in the system may cause the fluctuation of the intermediate air supply, which makes the compressor to the operating state deviate optimally. The efficiency point causes the compressor to not operate at the optimum efficiency point.
另外,双级压缩空调系统常规除霜的方式是制热过程中,达到除霜条件时,压缩机先停机,然后开机转制冷模式,进行除霜。当除霜结束后,再停机,然后开机转回制热模式。这种除霜方式,压缩机经过两次开停,除霜耗时长。且制冷模式下会从室内环境吸收热量,导致除霜过程中室内温度迅速下降,影响用户使用到舒适性。为了解决传统除霜方式存在的上述问题,现有技术提出了一种蓄热除霜方法,该除霜方法采用设置在压缩机壳体上的蓄热器作为除霜工况时的主要低温热源。制冷或制热时,蓄热器吸收压缩机的废热,制热除霜时,四通换向阀不换向,冷媒在室内换热器流出后,经过与电子膨胀阀并联的旁通管路进入到室外换热器进行除霜。虽然该除霜方法可以解决传统除霜方式存在的上述问题,但是,由于该除霜方式是利用压缩机产生的热量来进行蓄热,因此所使用的相变蓄热材料相变温度点必然会较低,蓄热材料吸热和放热速度会较慢,从而使得除霜速度较慢,延长化霜时间,同样影响制热效果和舒适度。尤其对于带除霜功能的双级压缩空调系统,在制热的时候,因为闪蒸器的存在,冷媒在流过闪蒸器的时候必定会被再次过冷,即流入室外换热器的冷媒必定处于相较于单级压缩更低的温度,那么其结霜情况会更严重、更频繁,因此除霜速度更慢。而且,在蓄热器蓄热量不足时进行除霜,会导致大量蒸发不完的制冷剂进入压缩机,从而对压缩机的可靠性造成致命的威胁。In addition, the conventional defrosting method of the two-stage compressed air-conditioning system is in the heating process, when the defrosting condition is reached, the compressor is first stopped, and then the cooling mode is turned on to perform defrosting. When the defrost is over, stop it again, then turn it back on to the heating mode. This kind of defrosting method, the compressor goes through two stops, and the defrosting takes a long time. In the cooling mode, heat is absorbed from the indoor environment, which causes the indoor temperature to drop rapidly during the defrosting process, which affects the user's comfort. In order to solve the above problems in the conventional defrosting mode, the prior art proposes a heat storage defrosting method which uses a heat accumulator provided on a compressor casing as a main low temperature heat source in a defrosting condition. . During cooling or heating, the accumulator absorbs the waste heat of the compressor. When the heating and defrosting, the four-way reversing valve does not change direction, and after the refrigerant flows out of the indoor heat exchanger, the bypass line is connected in parallel with the electronic expansion valve. Enter the outdoor heat exchanger for defrosting. Although the defrosting method can solve the above-mentioned problems in the conventional defrosting method, since the defrosting method uses heat generated by the compressor to store heat, the phase change temperature point of the phase change heat storage material used is inevitably Lower, the heat absorption and heat release rate of the heat storage material will be slower, which makes the defrosting speed slower and prolongs the defrosting time, which also affects the heating effect and comfort. Especially for the two-stage compressed air conditioning system with defrosting function, when heating, because of the existence of the flasher, the refrigerant will be subcooled again when flowing through the flasher, that is, the refrigerant flowing into the outdoor heat exchanger must be at Compared to the lower temperature of single-stage compression, the frosting situation is more serious and more frequent, so the defrost speed is slower. Moreover, defrosting when the heat storage of the heat accumulator is insufficient may cause a large amount of refrigerant that has not evaporated to enter the compressor, thereby posing a fatal threat to the reliability of the compressor.
发明内容Summary of the invention
针对上述现有技术现状,本发明所要解决的技术问题在于,提供一种双级压缩空调系统,其中间补气量可调节,并且,除霜速度快,可以避免除霜时蒸发不完的制冷剂进入压缩机对压缩机造成不利影响。 In view of the above state of the art, the technical problem to be solved by the present invention is to provide a two-stage compressed air conditioning system in which the amount of air supply can be adjusted, and the defrosting speed is fast, and the refrigerant that can not be evaporated during defrosting can be avoided. Entering the compressor adversely affects the compressor.
为了解决上述技术问题,本发明所提供的一种双级压缩空调系统,包括双级压缩机、四通换向阀、室外换热器、第一节流装置、闪蒸器、第二节流装置和室内换热器,所述双级压缩机的排气口和吸气口通过所述四通换向阀与所述室外换热器的第一端接口和所述室内换热器的第一端接口相连通,所述室外换热器的第二端接口通过所述第一节流装置与所述闪蒸器的第一接口相连通,所述闪蒸器的第二接口通过所述第二节流装置与所述室内换热器的第二端接口相连通,所述闪蒸器的第三接口通过补气管路与所述双级压缩机的补气口相连通;In order to solve the above technical problem, the present invention provides a two-stage compression air conditioning system, including a two-stage compressor, a four-way reversing valve, an outdoor heat exchanger, a first throttling device, a flasher, and a second throttling device. And an indoor heat exchanger, wherein the exhaust port and the suction port of the two-stage compressor pass through the four-way reversing valve to interface with the first end of the outdoor heat exchanger and the first of the indoor heat exchanger The end interface is in communication, the second end interface of the outdoor heat exchanger is in communication with the first interface of the flasher through the first throttling device, and the second interface of the flasher passes the second section The flow device is in communication with the second end interface of the indoor heat exchanger, and the third interface of the flasher is connected to the air inlet of the two-stage compressor through an air supply line;
所述第一节流装置和所述第二节流装置的开度可调节;The opening degrees of the first throttle device and the second throttle device are adjustable;
还包括旁通管路、蓄热器和控制阀,所述旁通管路连接在所述室外换热器的第一端接口与所述双级压缩机的吸气口之间,所述蓄热器具有第一换热管和第二换热管,所述第一换热管串联在所述双级压缩机的排气口与所述室内换热器的第一端接口之间的管路上,所述第二换热管串联在所述旁通管路上,所述控制阀用于选择性地导通或断开所述室外换热器的第一端接口与所述双级压缩机的吸气口之间的管路和所述旁通管路。a bypass line, a heat accumulator, and a control valve, the bypass line being connected between the first end interface of the outdoor heat exchanger and the intake port of the two-stage compressor, The heat exchanger has a first heat exchange tube and a second heat exchange tube, the first heat exchange tube being connected in series between the exhaust port of the two-stage compressor and the first end interface of the indoor heat exchanger On the way, the second heat exchange tube is connected in series on the bypass line, and the control valve is configured to selectively turn on or off the first end interface of the outdoor heat exchanger and the two-stage compressor The line between the suction ports and the bypass line.
在其中一个实施例中,所述的双级压缩空调系统还包括第三节流装置,所述第三节流装置串联在所述蓄热器的所述第二换热管入口侧的所述旁通管路上。In one embodiment, the two-stage compression air conditioning system further includes a third throttling device, the third throttling device being serially connected to the second heat exchange tube inlet side of the regenerator On the bypass line.
在其中一个实施例中,所述第三节流装置为毛细管。In one of the embodiments, the third throttling device is a capillary tube.
在其中一个实施例中,所述控制阀的通道孔径小于冷媒管的孔径,使经过所述控制阀的冷媒节流后流入所述蓄热器的所述第二换热管。In one embodiment, the passage diameter of the control valve is smaller than the diameter of the refrigerant tube, and the refrigerant passing through the control valve is throttled and flows into the second heat exchange tube of the heat accumulator.
在其中一个实施例中,所述旁通管路的一端连接在所述四通换向阀与所述室外换热器的第一端接口之间的管路上,另一端连接在所述四通换向阀与所述双级压缩机的吸气口之间的管路上。In one embodiment, one end of the bypass line is connected to the pipeline between the four-way switching valve and the first end interface of the outdoor heat exchanger, and the other end is connected to the four-way The reversing valve is on the line between the suction port of the two-stage compressor.
在其中一个实施例中,所述旁通管路的两端均连接在所述四通换向阀与所述双级压缩机的吸气口之间的管路上。In one embodiment, both ends of the bypass line are connected to a line between the four-way switching valve and the suction port of the two-stage compressor.
在其中一个实施例中,所述控制阀为三通阀。In one of the embodiments, the control valve is a three-way valve.
在其中一个实施例中,所述第一节流装置和所述第二节流装置均为电子膨胀阀。In one embodiment, the first throttling device and the second throttling device are both electronic expansion valves.
在其中一个实施例中,所述补气管路上设置有补气阀。In one embodiment, the supplemental gas line is provided on the supplemental gas line.
本发明所提供的一种双级压缩空调系统的控制方法,包括: The invention provides a control method for a two-stage compressed air conditioning system, comprising:
制冷或制热运行时,所述控制阀导通所述室外换热器的第一端接口与所述双级压缩机的吸气口之间的管路、断开所述旁通管路,通过调节所述第一节流装置和/或所述第二节流装置的开度大小调节经过所述补气管路的制冷剂的流量大小;During cooling or heating operation, the control valve conducts a pipeline between a first end interface of the outdoor heat exchanger and an intake port of the two-stage compressor, and disconnects the bypass pipeline. Adjusting a flow rate of the refrigerant passing through the supplemental gas line by adjusting an opening degree of the first throttling device and/or the second throttling device;
除霜运行时,所述控制阀断开所述室外换热器的第一端接口与所述双级压缩机的吸气口之间的管路、导通所述旁通管路。During the defrosting operation, the control valve opens a line between the first end interface of the outdoor heat exchanger and the suction port of the two-stage compressor, and conducts the bypass line.
在其中一个实施例中,除霜运行时,所述补气管路断开。In one of the embodiments, the plenum line is disconnected during the defrosting operation.
与现有技术相比,本发明的双级压缩空调系统及其控制方法,由于第一节流装置和第二节流装置的开度可调节,通过调节第一节流装置和/或第二节流装置的开度大小即可调节经过补气管路的制冷剂的流量大小,从而可以有效到调节中间补气段的进气量,使系统运行在最佳效率点附近,提高了系统的运行效率;而且,该双级压缩空调系统利用压缩机直接排出的高温制冷剂进行蓄热,因此可以采用相变温度点较高的相变蓄热材料,这样,在除霜时,相变蓄热材料与制冷剂的温差加大,相变蓄热材料的放热速度快,相应除霜速度也会加快,保证了用户使用的舒适性。而且,除霜时蓄热器蓄热量充足,避免了蒸发不完的制冷剂进入压缩机造成液击,从而对压缩机的可靠性造成致命的威胁。Compared with the prior art, the two-stage compressed air conditioning system of the present invention and the control method thereof are adjustable by adjusting the opening degree of the first throttle device and the second throttle device by adjusting the first throttle device and/or the second The opening degree of the throttling device can adjust the flow rate of the refrigerant passing through the air supply line, so that the intake air amount of the intermediate air supply section can be effectively adjusted, so that the system operates near the optimal efficiency point, thereby improving the operation of the system. Efficiency; Moreover, the two-stage compressed air conditioning system uses a high-temperature refrigerant directly discharged from a compressor to store heat, so that a phase change heat storage material having a high phase transition temperature point can be used, so that phase change heat storage during defrosting The temperature difference between the material and the refrigerant is increased, the heat release rate of the phase change heat storage material is fast, and the corresponding defrosting speed is also accelerated, thereby ensuring the comfort of the user. Moreover, the heat storage of the regenerator is sufficient when defrosting, so that the refrigerant that has not flowed into the compressor is prevented from causing liquid shock, thereby posing a fatal threat to the reliability of the compressor.
本发明附加技术特征所具有的有益效果将在本说明书具体实施方式部分进行说明。Advantageous effects of the additional features of the present invention will be described in the Detailed Description of the Detailed Description.
附图说明DRAWINGS
图1为本发明其中一个实施例中的双级压缩空调系统的系统图;1 is a system diagram of a two-stage compression air conditioning system in one embodiment of the present invention;
图2为图1中的双级压缩空调系统制冷时的流程示意图;2 is a schematic flow chart of the two-stage compressed air conditioning system of FIG. 1 during cooling;
图3为图1中的双级压缩空调系统制热时的流程示意图;3 is a schematic flow chart of the two-stage compressed air conditioning system of FIG. 1 during heating;
图4为图1中的双级压缩空调系统除霜时的流程示意图。4 is a schematic flow chart of the two-stage compressed air conditioning system of FIG. 1 during defrosting.
附图标记说明:1、双级压缩机;2、室内换热器;3、第二节流装置;4、闪蒸器;5、第一节流装置;6、室外换热器;7、三通阀;8、四通换向阀;9、补气阀;10、第三节流装置;11、蓄热器;11a、第一换热管;11b、第二换热管;12、补气管路;13、旁通管路。 DESCRIPTION OF REFERENCE NUMERALS: 1. two-stage compressor; 2. indoor heat exchanger; 3. second throttle device; 4. flash evaporator; 5. first throttle device; Through valve; 8, four-way reversing valve; 9, air supply valve; 10, third throttling device; 11, regenerator; 11a, first heat exchange tube; 11b, second heat exchange tube; Gas line; 13, bypass line.
具体实施方式detailed description
下面参考附图并结合实施例对本发明进行详细说明。需要说明的是,在不冲突的情况下,以下各实施例及实施例中的特征可以相互组合。The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the features in the following embodiments and examples may be combined with each other without conflict.
如图1所示,本发明其中一个实施例中的双级压缩空调系统包括双级压缩机1、四通换向阀8、室外换热器6、第一节流装置5、闪蒸器4、第二节流装置3、室内换热器2、旁通管路13、蓄热器11和控制阀。As shown in FIG. 1, the two-stage compressed air conditioning system in one embodiment of the present invention includes a two-stage compressor 1, a four-way reversing valve 8, an outdoor heat exchanger 6, a first throttling device 5, and a flasher 4. The second throttle device 3, the indoor heat exchanger 2, the bypass line 13, the heat accumulator 11 and the control valve.
其中,所述双级压缩机1的排气口和吸气口通过所述四通换向阀8与所述室外换热器6的第一端接口6a和所述室内换热器2的第一端接口2a相连通,所述室外换热器6的第二端接口6b通过所述第一节流装置5与所述闪蒸器4的第一接口相连通,所述闪蒸器4的第二接口通过所述第二节流装置3与所述室内换热器2的第二端接口2b相连通,所述闪蒸器4的第三接口通过补气管路12与所述双级压缩机1的补气口相连通。所述第一节流装置5和所述第二节流装置3的开度可调节,这样,通过调节第一节流装置5和/或第二节流装置3的开度大小即可调节经过补气管路12的制冷剂的流量大小,从而可以有效到调节中间补气段的进气量,使系统运行在最佳效率点附近,提高了系统的运行效率。Wherein the exhaust port and the intake port of the two-stage compressor 1 pass through the four-way switching valve 8 and the first end interface 6a of the outdoor heat exchanger 6 and the first heat exchanger 2 One end interface 2a is in communication, and the second end interface 6b of the outdoor heat exchanger 6 is in communication with the first interface of the flasher 4 through the first throttling device 5, and the second of the flasher 4 The interface is connected to the second end interface 2b of the indoor heat exchanger 2 via the second throttle device 3, and the third interface of the flasher 4 passes through the air supply line 12 and the two-stage compressor 1 The air supply ports are connected. The opening degrees of the first throttling device 5 and the second throttling device 3 can be adjusted, so that the adjustment of the opening of the first throttling device 5 and/or the second throttling device 3 can be adjusted. The flow rate of the refrigerant in the air supply line 12 can effectively adjust the intake air amount of the intermediate air supply section, so that the system operates near the optimal efficiency point, thereby improving the operating efficiency of the system.
所述旁通管路13连接在所述室外换热器6的第一端接口6a与所述双级压缩机1的吸气口之间,本实施例中,所述旁通管路13的一端连接在所述四通换向阀8与所述室外换热器6的第一端接口之间的管路上,另一端连接在所述四通换向阀8与所述双级压缩机1的吸气口之间的管路上。当然,所述旁通管路13还可以两端均连接在所述四通换向阀8与所述双级压缩机1的吸气口之间的管路上。The bypass line 13 is connected between the first end interface 6a of the outdoor heat exchanger 6 and the air inlet of the two-stage compressor 1. In this embodiment, the bypass line 13 One end is connected to the pipeline between the four-way switching valve 8 and the first end interface of the outdoor heat exchanger 6, and the other end is connected to the four-way switching valve 8 and the two-stage compressor 1 On the line between the suction ports. Of course, the bypass line 13 can also be connected at both ends to the line between the four-way switching valve 8 and the suction port of the two-stage compressor 1.
所述蓄热器11具有第一换热管11a和第二换热管11b,所述第一换热管11a串联在所述双级压缩机1的排气口与所述四通换向阀8之间的管路上,第一换热管11a也可以连接在四通换向阀8与所述室内换热器2的第一端接口之间的管路上;所述第二换热管11b串联在所述旁通管路13上。The heat accumulator 11 has a first heat exchange tube 11a and a second heat exchange tube 11b, and the first heat exchange tube 11a is connected in series to an exhaust port of the two-stage compressor 1 and the four-way reversing valve The first heat exchange tube 11a may also be connected to the pipeline between the four-way switching valve 8 and the first end interface of the indoor heat exchanger 2; the second heat exchange tube 11b Connected in series on the bypass line 13.
所述控制阀用于选择性地导通或断开所述室外换热器6的第一端接口与所述双级压缩机1的吸气口之间的管路和所述旁通管路13。优选地,所述控制阀为三通阀7,三通阀7也可以采用两个二通阀代替。The control valve is configured to selectively turn on or off a line between the first end interface of the outdoor heat exchanger 6 and an intake port of the two-stage compressor 1 and the bypass line 13. Preferably, the control valve is a three-way valve 7, and the three-way valve 7 can also be replaced by two two-way valves.
本实施例的双级压缩空调系统利用压缩机直接排出的高温制冷剂进行蓄热,因此可以采用相变温度点较高的相变蓄热材料,这样,在除霜时,相变蓄热材料与制冷剂的温差加大,相变蓄热材料的放热速度快,相应除霜速度也会加快,保证了用户使用 的舒适性。而且,除霜时蓄热器11蓄热量充足,避免了蒸发不完的制冷剂进入压缩机造成液击,从而对压缩机的可靠性造成致命的威胁。The two-stage compressed air-conditioning system of the present embodiment uses the high-temperature refrigerant directly discharged from the compressor to store heat, so that a phase change heat storage material having a high phase transition temperature point can be used, so that the phase change heat storage material is used during defrosting. The temperature difference with the refrigerant increases, the heat release rate of the phase change heat storage material is fast, and the corresponding defrosting speed is also accelerated, ensuring the user's use. Comfort. Moreover, when the defrosting, the heat accumulator 11 has a sufficient amount of stored heat, thereby preventing the refrigerant that has not evaporated from entering the compressor and causing a liquid blow, thereby posing a fatal threat to the reliability of the compressor.
优选地,还包括第三节流装置10,所述第三节流装置10串联在所述第二换热管11b入口侧的所述旁通管路13上。进一步优选地,所述第三节流装置10为毛细管。这样,室外换热器6出口的冷媒通过毛细管节流后,再进入蓄热器11吸热蒸发,有利于液体冷媒完全蒸发,避免了蒸发不完的制冷剂进入双级压缩机1造成液击。当然,毛细管也可以用通道孔径小于冷媒管孔径的三通阀7代替,这样三通阀7也可以起到节流作用。Preferably, a third throttle device 10 is further included, the third throttle device 10 being connected in series on the bypass line 13 on the inlet side of the second heat exchange tube 11b. Further preferably, the third throttle device 10 is a capillary tube. In this way, the refrigerant at the outlet of the outdoor heat exchanger 6 is throttled by the capillary, and then enters the heat accumulator 11 to absorb heat and evaporate, which is beneficial to the complete evaporation of the liquid refrigerant, and avoids the liquid refrigerant that enters the two-stage compressor 1 by the endless refrigerant. . Of course, the capillary tube can also be replaced by a three-way valve 7 having a channel aperture smaller than the aperture of the refrigerant tube, so that the three-way valve 7 can also function as a throttle.
优选地,所述补气管路12上设置有补气阀9,通过补气阀9控制补气管路12的导通和断开。Preferably, the air supply line 12 is provided with an air supply valve 9 for controlling the conduction and disconnection of the air supply line 12 through the air supply valve 9.
本发明还提供一种双级压缩空调系统的控制方法,包括以下步骤:The invention also provides a control method for a two-stage compression air conditioning system, comprising the following steps:
步骤1、制冷或制热运行时,所述三通阀7导通所述室外换热器6的第一端接口与所述双级压缩机1的吸气口之间的管路、断开所述旁通管路13,所述补气阀9打开,通过调节所述第一节流装置5和/或所述第二节流装置3的开度大小调节经过所述补气管路12的制冷剂的流量大小。具体过程如下:Step 1, the cooling or heating operation, the three-way valve 7 is connected to the pipeline between the first end interface of the outdoor heat exchanger 6 and the suction port of the two-stage compressor 1 The bypass line 13 , the air supply valve 9 is opened, and the adjustment of the opening degree of the first throttle device 5 and/or the second throttle device 3 is regulated by the air supply line 12 . The flow rate of the refrigerant. The specific process is as follows:
系统制冷运行时,见图2,由双级压缩机1排气口出来的高温高压气体经过蓄热器11的第一换热管11a与相变蓄热材料进行热交换,相变蓄热材料吸热并发生相变,将热量储存起来,然后冷媒经四通换向阀8进入室外换热器6,并与室外环境换热,释放热量,冷媒先流经第一节流装置5,再进入闪蒸器4汽化,闪蒸器4分离出来的液态冷媒经第二节流装置3节流后进入室内换热器2,与室内环境进行换热,吸收室内热量环境热量,最后经过四通换向阀8进入双级压缩机1吸气口,完成一次制冷循环;闪蒸器4分离出来的气态冷媒经补气阀9进入双级压缩机1的补气口。当需要增大补气量时,开大第一节流装置5的开度,关小或维持第二节流装置3的开度,这样进入闪蒸器4的冷媒量增大,流出的冷媒量减小或不变,则中间补气量增大;或者,关小第一节流装置5的开度,同时更多地关小第二节流装置3的开度,这时虽然进入闪蒸器4的冷媒减少,但流出闪蒸器4的冷媒量减小的幅度更大,中间补气量增大。反之,当需要减小补气量时,关小第一节流装置5的开度,关大或维持第二节流装置3的开度,这样进入闪蒸器4的冷媒量减小,流出的冷媒量增加或不变,则中间补气量减小;或者,增大第一节流装置5的开度,同时更多地增大第二节流装置3的开度,这时虽然进入闪蒸器4的冷媒增加,但流出闪蒸器4的冷媒量增加的幅度更大,中间补气量减小。 In the system cooling operation, as shown in Fig. 2, the high temperature and high pressure gas from the exhaust port of the two-stage compressor 1 passes through the first heat exchange tube 11a of the heat accumulator 11 to exchange heat with the phase change heat storage material, and the phase change heat storage material The heat is absorbed and a phase change occurs, the heat is stored, and then the refrigerant enters the outdoor heat exchanger 6 through the four-way switching valve 8, and exchanges heat with the outdoor environment to release heat, and the refrigerant first flows through the first throttle device 5, and then After entering the flasher 4, the liquid refrigerant separated by the flasher 4 is throttled by the second throttling device 3 and then enters the indoor heat exchanger 2 to exchange heat with the indoor environment, absorb heat in the indoor heat environment, and finally pass through the four-way reversing direction. The valve 8 enters the suction port of the two-stage compressor 1 to complete a refrigeration cycle; the gaseous refrigerant separated by the flasher 4 enters the air inlet of the two-stage compressor 1 through the air supply valve 9. When it is necessary to increase the amount of air supply, the opening degree of the first throttling device 5 is opened, the opening degree of the second throttling device 3 is kept small, or the amount of refrigerant entering the flasher 4 is increased, and the amount of refrigerant flowing out is reduced. If the amount is small or constant, the amount of air in the middle is increased; or, the opening degree of the first throttle device 5 is turned off, and the opening degree of the second throttle device 3 is more closed, and although entering the flasher 4 The refrigerant is reduced, but the amount of refrigerant flowing out of the flasher 4 is reduced by a larger amount, and the amount of intermediate air is increased. On the contrary, when it is necessary to reduce the amount of air supply, the opening degree of the first throttling device 5 is turned off, the opening degree of the second throttling device 3 is kept large, or the amount of refrigerant entering the flasher 4 is reduced, and the refrigerant flowing out is reduced. When the amount is increased or not changed, the intermediate air supply amount is decreased; or, the opening degree of the first throttle device 5 is increased, and the opening degree of the second throttle device 3 is increased more, at which time the flasher 4 is entered. The amount of refrigerant increases, but the amount of refrigerant flowing out of the flasher 4 is increased more, and the amount of intermediate air is reduced.
系统制热运行时,见图3,由双级压缩机1排气口出来的高温高压气体经过蓄热器11的第一换热管11a与相变蓄热材料进行热交换,相变蓄热材料吸热并发生相变,将热量储存起来,然后冷媒经四通换向阀8进入室内换热器2,在室内换热器2冷凝放热,然后再经第二节流装置3节流后进入闪蒸器4进行气液分离,闪蒸器4分离出来的液态冷媒经第一节流装置5节流后进入室外换热器6,在室外换热器6进行蒸发,吸收热量,最后经过三通阀7和四通换向阀8进入双级压缩机1吸气口,完成一次制热循环;闪蒸器4分离出来的气态冷媒经补气阀9进入双级压缩机1的补气口。当需要增大补气量时,开大第二节流装置3的开度,关小或维持第一节流装置5的开度,这样进入闪蒸器4的冷媒量增大,流出的冷媒量减小或不变,则中间补气量增大;或者,关小第二节流装置3的开度,同时更多地关小第一节流装置5的开度,这时虽然进入闪蒸器4的冷媒减少,但流出闪蒸器4的冷媒量减小的幅度更大,中间补气量增大。反之,当需要减小补气量时,关小第二节流装置3的开度,关大或维持第一节流装置5的开度,这样进入闪蒸器4的冷媒量减小,流出的冷媒量增加或不变,则中间补气量减小;或者,增大第二节流装置3的开度,同时更多地增大第一节流装置5的开度,这时虽然进入闪蒸器4的冷媒增加,但流出闪蒸器4的冷媒量增加的幅度更大,中间补气量减小。In the heating operation of the system, as shown in Fig. 3, the high-temperature and high-pressure gas from the exhaust port of the two-stage compressor 1 passes through the first heat exchange tube 11a of the heat accumulator 11 to exchange heat with the phase change heat storage material, and the phase change heat storage The material absorbs heat and undergoes a phase change, and the heat is stored. Then, the refrigerant enters the indoor heat exchanger 2 via the four-way switching valve 8, condenses and releases heat in the indoor heat exchanger 2, and then throttling through the second throttling device 3. After entering the flasher 4 for gas-liquid separation, the liquid refrigerant separated by the flasher 4 is throttled by the first throttling device 5 and then enters the outdoor heat exchanger 6, and is evaporated in the outdoor heat exchanger 6, absorbing heat, and finally passing through three The through valve 7 and the four-way reversing valve 8 enter the suction port of the two-stage compressor 1 to complete a heating cycle; the gaseous refrigerant separated by the flasher 4 enters the air inlet of the two-stage compressor 1 through the air supply valve 9. When it is necessary to increase the amount of air supply, the opening degree of the second throttle device 3 is opened, the opening degree of the first throttle device 5 is kept small, or the amount of refrigerant entering the flasher 4 is increased, and the amount of refrigerant flowing out is reduced. If the amount is small or constant, the amount of air in the middle is increased; or, the opening degree of the second throttle device 3 is turned off, and the opening degree of the first throttle device 5 is more closed, and although entering the flasher 4 The refrigerant is reduced, but the amount of refrigerant flowing out of the flasher 4 is reduced by a larger amount, and the amount of intermediate air is increased. On the contrary, when it is necessary to reduce the amount of air supply, the opening degree of the second throttle device 3 is turned off, the opening degree of the first throttle device 5 is kept large, or the amount of refrigerant entering the flasher 4 is reduced, and the refrigerant flowing out is reduced. If the amount is increased or not changed, the intermediate air supply amount is decreased; or, the opening degree of the second throttle device 3 is increased, and the opening degree of the first throttle device 5 is increased more, at which time the flasher 4 is entered. The amount of refrigerant increases, but the amount of refrigerant flowing out of the flasher 4 is increased more, and the amount of intermediate air is reduced.
由此可见,由于第一节流装置5和第二节流装置3的开度可调节,通过调节第一节流装置5和/或第二节流装置3的开度大小即可调节经过补气管路12的制冷剂的流量大小,从而可以实现中间补气量的控制,使系统最佳效率点附近运行。It can be seen that since the opening degrees of the first throttling device 5 and the second throttling device 3 can be adjusted, the adjustment of the opening of the first throttling device 5 and/or the second throttling device 3 can be adjusted. The flow rate of the refrigerant in the gas line 12 can realize the control of the intermediate gas supply amount, and the operation is performed near the optimum efficiency point of the system.
步骤2、除霜运行时,所述三通阀7断开所述室外换热器6的第一端接口与所述双级压缩机1的吸气口之间的管路、导通所述旁通管路13,所述补气阀9关闭。具体过程如下:Step 2, the defrosting operation, the three-way valve 7 disconnects the pipeline between the first end interface of the outdoor heat exchanger 6 and the suction port of the two-stage compressor 1, and conducts the The bypass line 13 is closed and the makeup valve 9 is closed. The specific process is as follows:
当系统由制热运行进入除霜时,见图4,双级压缩机1排气口排出的高温冷媒流经蓄热器11的第一换热管11a与相变蓄热材料进行热交换,相变蓄热材料吸热并发生相变,将热量储存起来,然后冷媒经四通换向阀8进入室内换热器2,为了减小热量损失,此时室内风机为关闭或低风挡状态。流经室内换热器2后冷媒只有少量的热损失,然后流经第二节流装置3、闪蒸器4、第一节流装置5,为保证在流经这三个元件的时候冷媒的热损失尽量减小,第二节流装置3和第一节流装置5的开度开到最大,关闭补气阀9。然后高温冷媒进入室外换热器6进行除霜;在室外换热器6内冷凝换热后,再通过三通阀7换向进入蓄热器11的第二换热管11b,吸收蓄热器11内积蓄的热量,进行蒸发,然后进入双级压缩机1吸气口,完成除霜循环。 When the system enters the defrosting by the heating operation, as shown in FIG. 4, the high-temperature refrigerant discharged from the exhaust port of the two-stage compressor 1 flows through the first heat exchange tube 11a of the heat accumulator 11 to exchange heat with the phase change heat storage material. The phase change heat storage material absorbs heat and undergoes a phase change, and the heat is stored, and then the refrigerant enters the indoor heat exchanger 2 through the four-way switching valve 8. In order to reduce the heat loss, the indoor fan is in a closed or low windshield state. After flowing through the indoor heat exchanger 2, the refrigerant has only a small amount of heat loss, and then flows through the second throttling device 3, the flasher 4, and the first throttling device 5, in order to ensure the heat of the refrigerant while flowing through the three components. The loss is minimized, and the opening of the second throttle device 3 and the first throttle device 5 is maximized, and the air supply valve 9 is closed. Then, the high-temperature refrigerant enters the outdoor heat exchanger 6 for defrosting; after condensing and heat exchange in the outdoor heat exchanger 6, the second heat exchange tube 11b is reversing into the heat accumulator 11 through the three-way valve 7, and the heat accumulator is absorbed. The accumulated heat in 11 is evaporated, and then enters the suction port of the two-stage compressor 1 to complete the defrost cycle.
由此可见,本发明实施例的双级压缩空调系统,利用压缩机直接排出的高温制冷剂进行蓄热,因此可以采用相变温度点较高的相变蓄热材料,这样,在除霜时,相变蓄热材料与制冷剂的温差加大,相变蓄热材料的放热速度快,相应除霜速度也会加快,保证了用户使用的舒适性。而且,除霜时蓄热器蓄热量充足,避免了蒸发不完的制冷剂进入压缩机造成液击,从而对压缩机的可靠性造成致命的威胁。It can be seen that the two-stage compressed air-conditioning system according to the embodiment of the present invention uses the high-temperature refrigerant directly discharged by the compressor to store heat, so that a phase change heat storage material having a higher phase transition temperature point can be used, so that during defrosting The temperature difference between the phase change heat storage material and the refrigerant is increased, the heat release rate of the phase change heat storage material is fast, and the corresponding defrosting speed is also accelerated, thereby ensuring the comfort of the user. Moreover, the heat storage of the regenerator is sufficient when defrosting, so that the refrigerant that has not flowed into the compressor is prevented from causing liquid shock, thereby posing a fatal threat to the reliability of the compressor.
以上所述实施例仅表达了本发明的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对本发明专利范围的限制。应当指出的是,对于本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。 The above-mentioned embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (11)

  1. 一种双级压缩空调系统,包括双级压缩机、四通换向阀、室外换热器、第一节流装置、闪蒸器、第二节流装置和室内换热器,所述双级压缩机的排气口和吸气口通过所述四通换向阀与所述室外换热器的第一端接口和所述室内换热器的第一端接口相连通,所述室外换热器的第二端接口通过所述第一节流装置与所述闪蒸器的第一接口相连通,所述闪蒸器的第二接口通过所述第二节流装置与所述室内换热器的第二端接口相连通,所述闪蒸器的第三接口通过补气管路与所述双级压缩机的补气口相连通;A two-stage compression air conditioning system comprising a two-stage compressor, a four-way reversing valve, an outdoor heat exchanger, a first throttling device, a flasher, a second throttling device and an indoor heat exchanger, the two-stage compression The exhaust port and the suction port of the machine communicate with the first end interface of the outdoor heat exchanger and the first end interface of the indoor heat exchanger through the four-way switching valve, the outdoor heat exchanger a second end interface is in communication with the first interface of the flasher via the first throttling device, the second interface of the flasher is passed through the second throttling device and the first heat exchanger The two-terminal interface is in communication, and the third interface of the flasher is connected to the air inlet of the two-stage compressor through an air supply line;
    其特征在于,所述第一节流装置和所述第二节流装置的开度可调节;The feature is that the opening degrees of the first throttling device and the second throttling device are adjustable;
    还包括旁通管路、蓄热器和控制阀,所述旁通管路连接在所述室外换热器的第一端接口与所述双级压缩机的吸气口之间,所述蓄热器具有第一换热管和第二换热管,所述第一换热管串联在所述双级压缩机的排气口与所述室内换热器的第一端接口之间的管路上,所述第二换热管串联在所述旁通管路上,所述控制阀用于选择性地导通或断开所述室外换热器的第一端接口与所述双级压缩机的吸气口之间的管路和所述旁通管路。a bypass line, a heat accumulator, and a control valve, the bypass line being connected between the first end interface of the outdoor heat exchanger and the intake port of the two-stage compressor, The heat exchanger has a first heat exchange tube and a second heat exchange tube, the first heat exchange tube being connected in series between the exhaust port of the two-stage compressor and the first end interface of the indoor heat exchanger On the way, the second heat exchange tube is connected in series on the bypass line, and the control valve is configured to selectively turn on or off the first end interface of the outdoor heat exchanger and the two-stage compressor The line between the suction ports and the bypass line.
  2. 根据权利要求1所述的双级压缩空调系统,其特征在于,还包括第三节流装置,所述第三节流装置串联在所述蓄热器的所述第二换热管入口侧的所述旁通管路上。A two-stage compressed air conditioning system according to claim 1, further comprising a third throttle device, said third throttle device being connected in series on said inlet side of said second heat exchange tube of said heat accumulator On the bypass line.
  3. 根据权利要求2所述的双级压缩空调系统,其特征在于,所述第三节流装置为毛细管。The two-stage compression air conditioning system according to claim 2, wherein the third throttle device is a capillary tube.
  4. 根据权利要求1所述的双级压缩空调系统,其特征在于,所述控制阀的通道孔径小于冷媒管的孔径,使经过所述控制阀的冷媒节流后流入所述蓄热器的所述第二换热管。The two-stage compressed air conditioning system according to claim 1, wherein a passage aperture of the control valve is smaller than an aperture of the refrigerant pipe, and the refrigerant flowing through the control valve is throttled and flows into the heat accumulator The second heat exchange tube.
  5. 根据权利要求1所述的双级压缩空调系统,其特征在于,所述旁通管路的一端连接在所述四通换向阀与所述室外换热器的第一端接口之间的管路上,另一端连接在所述四通换向阀与所述双级压缩机的吸气口之间的管路上。The two-stage compressed air conditioning system according to claim 1, wherein one end of the bypass line is connected to a pipe between the four-way switching valve and the first end interface of the outdoor heat exchanger On the road, the other end is connected to the line between the four-way reversing valve and the suction port of the two-stage compressor.
  6. 根据权利要求1所述的双级压缩空调系统,其特征在于,所述旁通管路的两端均连接在所述四通换向阀与所述双级压缩机的吸气口之间的管路上。 The two-stage compressed air conditioning system according to claim 1, wherein both ends of the bypass line are connected between the four-way switching valve and the suction port of the two-stage compressor. On the pipeline.
  7. 根据权利要求1所述的双级压缩空调系统,其特征在于,所述控制阀为三通阀。The two-stage compression air conditioning system of claim 1 wherein said control valve is a three-way valve.
  8. 根据权利要求1至7中任意一项所述的双级压缩空调系统,其特征在于,所述第一节流装置和所述第二节流装置均为电子膨胀阀。The two-stage compression air conditioning system according to any one of claims 1 to 7, wherein the first throttle device and the second throttle device are both electronic expansion valves.
  9. 根据权利要求1至7中任意一项所述的双级压缩空调系统,其特征在于,所述补气管路上设置有补气阀。The two-stage compressed air conditioning system according to any one of claims 1 to 7, characterized in that the air supply line is provided with an air supply valve.
  10. 一种如权利要求1至9中任意一项所述的双级压缩空调系统的控制方法,其特征在于,包括:A control method for a two-stage compression air-conditioning system according to any one of claims 1 to 9, characterized in that it comprises:
    制冷或制热运行时,所述控制阀导通所述室外换热器的第一端接口与所述双级压缩机的吸气口之间的管路、断开所述旁通管路,通过调节所述第一节流装置和/或所述第二节流装置的开度大小调节经过所述补气管路的制冷剂的流量大小;During cooling or heating operation, the control valve conducts a pipeline between a first end interface of the outdoor heat exchanger and an intake port of the two-stage compressor, and disconnects the bypass pipeline. Adjusting a flow rate of the refrigerant passing through the supplemental gas line by adjusting an opening degree of the first throttling device and/or the second throttling device;
    除霜运行时,所述控制阀断开所述室外换热器的第一端接口与所述双级压缩机的吸气口之间的管路、导通所述旁通管路。During the defrosting operation, the control valve opens a line between the first end interface of the outdoor heat exchanger and the suction port of the two-stage compressor, and conducts the bypass line.
  11. 根据权利要求10所述的双级压缩空调系统的控制方法,其特征在于,除霜运行时,所述补气管路断开。 The control method of a two-stage compression air-conditioning system according to claim 10, wherein the air supply line is disconnected during the defrosting operation.
PCT/CN2015/076355 2014-06-12 2015-04-10 Two-stage compression air conditioning system and control method thereof WO2015188656A1 (en)

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