Air conditioning system, and method for controlling air conditioning system

Abstract

An air conditioning system includes an indoor electronic expansion valve, and at least one liquid phase branch pipe. Each liquid phase branch pipe includes a first flow pipe and a second flow pipe. An end of the second flow pipe is communicated to an end of the first flow pipe, and another end of the second flow pipe is communicated to the indoor electronic expansion valve. The liquid phase branch pipe is configured to branch or converge a refrigerant flowing through the liquid phase branch pipe. The first flow pipe includes at least one mixing member, each mixing member has a plurality of first through holes, and the plurality of first through holes are used to communicate two ends of the first flow pipe.

What is claimed is: 
     
         1 . An air conditioning system, comprising:
 an outdoor unit including a compressor, an outdoor electronic expansion valve, and an outdoor heat exchanger;   an indoor unit including an indoor electronic expansion valve and an indoor heat exchanger; wherein the compressor compresses a refrigerant and discharges the compressed refrigerant, and the outdoor heat exchanger condenses the compressed refrigerant; the outdoor electronic expansion valve and the indoor electronic expansion valve adjust an amount of the refrigerant condensed by the outdoor heat exchanger, and the indoor heat exchanger evaporates the refrigerant adjusted by the indoor electronic expansion valve; and   at least one liquid phase branch pipe, and each liquid phase branch pipe including a first flow pipe and a second flow pipe; an end of the second flow pipe being communicated to an end of the first flow pipe, and another end of the second flow pipe being communicated to the indoor electronic expansion valve; the liquid phase branch pipe being configured to branch or converge a refrigerant flowing through the liquid phase branch pipe;   wherein the first flow pipe includes at least one mixing member, each mixing member has a plurality of first through holes, and the plurality of first through holes are used to communicate two ends of the first flow pipe.   
     
     
         2 . The air conditioning system according to  claim 1 , wherein the mixing member includes:
 at least one first mixing piece, and each first mixing piece having a mesh structure; the mesh structure having a plurality of second through holes, and the plurality of second through holes being used to communicate the two ends of the first flow pipe.   
     
     
         3 . The air conditioning system according to  claim 2 , wherein a hole shape of the second through hole is square, diamond, or triangular. 
     
     
         4 . The air conditioning system according to  claim 2 , wherein in the first flow pipe, a mesh number of the second through holes in the at least one first mixing piece is increased along an X to X′ direction. 
     
     
         5 . The air conditioning system according to  claim 1 , wherein the mixing member further includes:
 at least one second mixing piece, and each second mixing piece including a first piece body; the first piece body being provided with a plurality of third through holes, and the third through holes being used to communicate the two ends of the first flow pipe;   wherein in the case where the mixing member includes at least one first mixing piece, the at least one second mixing piece is located at a side of the at least one first mixing piece away from the indoor electronic expansion valve.   
     
     
         6 . The air conditioning system according to  claim 5 , wherein the plurality of third through holes are arranged in a matrix, a Z-shaped, a K-shaped, a 45° misaligned arrangement, or a 60° misaligned arrangement. 
     
     
         7 . The air conditioning system according to  claim 1 , wherein the mixing member further includes:
 at least one third mixing piece, and each third mixing piece including a second piece body; the second piece body being provided with a plurality of fourth through holes, and the fourth through holes being used to communicate the two ends of the first flow pipe.   
     
     
         8 . The air conditioning system according to  claim 7 , wherein the third mixing piece further includes a plurality of sleeves; the plurality of sleeves are respectively connected to a same side of the second piece body, and a sleeve is aligned with a fourth through hole, so as to communicate the two ends of the first flow pipe. 
     
     
         9 . The air conditioning system according to  claim 1 , further comprising a controller configured to:
 obtain an opening degree of the indoor electronic expansion valve;   in a case where a first preset condition is satisfied, adjust an opening degree of the outdoor electronic expansion valve according to a relationship between a subcooling degree of the outdoor heat exchanger and a first target subcooling degree interval, and adjust the opening degree of the indoor electronic expansion valve according to a relationship between an exhaust superheat degree of the compressor and a target exhaust superheat degree interval; and   in a case where the first preset condition is not satisfied, adjust the opening degree of the outdoor electronic expansion valve and the opening degree of the indoor electronic expansion valve according to a relationship between the exhaust superheat degree of the compressor and the target exhaust superheat degree interval;   wherein the first preset condition includes that the opening degree of the indoor electronic expansion valve is less than a first preset opening degree.   
     
     
         10 . The air conditioning system according to  claim 9 , wherein the air conditioning system comprises a plurality of indoor units, and the controller is further configured to:
 in a case where the first preset condition and a second preset condition are satisfied, adjust the opening degree of the outdoor electronic expansion valve and the opening degree of the indoor electronic expansion valve according to the relationship between the exhaust superheat degree of the compressor and the target exhaust superheat degree interval;   in a case where the first preset condition is satisfied and the second preset condition is not satisfied, adjust the opening degree of outdoor electronic expansion valve according to a relationship between the subcooling degree of the outdoor heat exchanger and the first target subcooling degree interval, and adjust the opening degree of the indoor electronic expansion valve according to the relationship between the exhaust superheat degree of the compressor and the target exhaust superheat degree interval;   wherein the second preset condition includes that an opening degree of a target indoor electronic expansion valve in a target indoor unit is greater than or equal to a second preset opening degree, a superheat degree of a target indoor heat exchanger in the target indoor unit is greater than or equal to a target superheat degree, and the exhaust superheat degree of the compressor is greater than or equal to an upper limit of the target exhaust superheat degree interval; the target indoor unit is one of the plurality of indoor units; and the second preset opening degree is greater than the first preset opening degree.   
     
     
         11 . The air conditioning system according to  claim 9 , wherein the controller is configured to:
 if the subcooling degree of the outdoor heat exchanger is greater than an upper limit of the first target subcooling degree interval, increase the opening degree of the outdoor electronic expansion valve;   if the subcooling degree of the outdoor heat exchanger is less than a lower limit of the first target subcooling degree interval, reduce the opening degree of the outdoor electronic expansion valve; and   if the subcooling degree of the outdoor heat exchanger is greater than or equal to the lower limit of the first target subcooling degree interval, and is less than or equal to the upper limit of the first target subcooling degree interval, control the opening degree of the outdoor electronic expansion valve to remain unchanged.   
     
     
         12 . The air conditioning system according to  claim 9 , wherein the compressor compresses the refrigerant and discharges the compressed refrigerant, and the indoor heat exchanger condenses the compressed refrigerant; the indoor electronic expansion valve and the outdoor electronic expansion valve adjust the amount of refrigerant condensed by the outdoor heat exchanger, and the outdoor heat exchanger evaporates the refrigerant adjusted by the outdoor electronic expansion valve;
 the controller further configured to:   obtain the opening degree of the outdoor electronic expansion valve;   in a case where a third preset condition is satisfied, adjust the opening degree of the indoor electronic expansion valve according to a relationship between a subcooling degree of the indoor heat exchanger and a second target subcooling degree interval, and adjust the opening degree of the outdoor electronic expansion valve according to the relationship between the exhaust superheat degree of the compressor and the target exhaust superheat degree interval; and   in a case where the third preset condition is not satisfied, adjust the opening degree of the outdoor electronic expansion valve and the opening degree of the indoor electronic expansion valve according to the relationship between the exhaust superheat degree of the compressor and the target exhaust superheat degree interval;   wherein the third preset condition includes that the opening degree of the outdoor electronic expansion valve is less than a third preset opening degree.   
     
     
         13 . The air conditioning system according to  claim 12 , wherein the controller is further configured to:
 in a case where the third preset condition and a fourth preset condition are satisfied, adjust the opening degree of the outdoor electronic expansion valve and the opening degree of the indoor electronic expansion valve according to the relationship between the exhaust superheat degree of the compressor and the target exhaust superheat degree interval;   in a case where the third preset condition is satisfied and the fourth preset condition is not satisfied, adjust the opening degree of the indoor electronic expansion valve according to the relationship between the subcooling degree of the indoor heat exchanger and the second target subcooling degree interval, and adjust the outdoor electronic expansion valve according to the relationship between the exhaust superheat degree of the compressor and the target exhaust superheat degree interval;   wherein the fourth preset condition includes that the opening degree of the outdoor electronic expansion valve is greater than or equal to a fourth preset opening degree, and the exhaust superheat degree of the compressor is greater than or equal to an upper limit of the target exhaust superheat degree interval; and the fourth preset opening degree is greater than the third preset opening degree.   
     
     
         14 . The air conditioning system according to  claim 12 , wherein the controller is configured to:
 if the subcooling degree of the indoor heat exchanger is greater than an upper limit of the second target subcooling degree interval, increase the opening degree of the indoor electronic expansion valve;   if the subcooling degree of the indoor heat exchanger is less than a lower limit of the second target subcooling degree interval, reduce the opening degree of the indoor electronic expansion valve; and   if the subcooling degree of the indoor heat exchanger is greater than or equal to the lower limit of the second target subcooling degree interval, and is less than or equal to the upper limit of the second target subcooling degree interval, control the opening degree of the indoor electronic expansion valve to remain unchanged.   
     
     
         15 . The air conditioning system according to  claim 9 , wherein the controller is configured to:
 if the exhaust superheat degree of the compressor is greater than an upper limit of the target superheat degree interval, increase an opening degree of at least one of the outdoor electronic expansion valve and the indoor electronic expansion valve;   if the exhaust superheat degree of the compressor is less than a lower limit of the target superheat degree interval, reduce the opening degree of the at least one of the outdoor electronic expansion valve and the indoor electronic expansion valve; and   if the exhaust superheat degree of the compressor is greater than or equal to the upper limit of the target superheat degree interval and less than or equal to the lower limit of the target superheat degree interval, control an opening degree of at least one of the outdoor electronic expansion valve and a plurality of indoor electronic expansion valves to remain unchanged.   
     
     
         16 . A method for controlling an air conditioning system, wherein the air conditioning system includes an outdoor unit, an indoor unit, and a controller; the outdoor unit includes a compressor, an outdoor electronic expansion valve, and an outdoor heat exchanger; the indoor unit includes an indoor electronic expansion valve and an indoor heat exchanger; the compressor compresses a refrigerant and discharges the compressed refrigerant, and the outdoor heat exchanger condenses the compressed refrigerant; and the outdoor electronic expansion valve and the indoor electronic expansion valve adjust amount of the refrigerant condensed by the outdoor heat exchanger, and the indoor heat exchanger evaporates the refrigerant adjusted by the indoor electronic expansion valve;
 the method comprises:   obtaining an opening degree of the indoor electronic expansion valve;   in a case where a first preset condition is satisfied, adjusting an opening degree of the outdoor electronic expansion valve according to a relationship between a subcooling degree of the outdoor heat exchanger and a first target subcooling degree interval, and adjusting the opening degree of the indoor electronic expansion valve according to a relationship between an exhaust superheat degree of the compressor and a target exhaust superheat degree interval;   in a case where the first preset condition is not satisfied, adjusting the opening degree of the outdoor electronic expansion valve and the opening degree of the indoor electronic expansion valve according to a relationship between the exhaust superheat degree of the compressor and the target exhaust superheat degree interval;   wherein the first preset condition includes that the opening degree of the indoor electronic expansion valve is less than a first preset opening degree.   
     
     
         17 . The method according to  claim 16 , wherein the indoor unit includes a plurality of indoor units, and the method comprises:
 in a case where the first preset condition and a second preset condition are satisfied, adjusting the opening degree of the outdoor electronic expansion valve and the opening degree of the indoor electronic expansion valve according to the relationship between the exhaust superheat degree of the compressor and the target exhaust superheat degree interval;   in a case where the first preset condition is satisfied and the second preset condition is not satisfied, adjusting the opening degree of outdoor electronic expansion valve according to a relationship between the subcooling degree of the outdoor heat exchanger and the first target subcooling degree interval, and adjusting the opening degree of the indoor electronic expansion valve according to the relationship between the exhaust superheat degree of the compressor and the target exhaust superheat degree interval;   wherein the second preset condition includes that an opening degree of a target indoor electronic expansion valve in a target indoor unit is greater than or equal to a second preset opening degree, a superheat degree of a target indoor heat exchanger in the target indoor unit is greater than or equal to a target superheat degree, and the exhaust superheat degree of the compressor is greater than or equal to an upper limit of the target exhaust superheat degree interval; the target indoor unit is one of the plurality of indoor units; and the second preset opening degree is greater than the first preset opening degree.   
     
     
         18 . The method according to  claim 16 , wherein the adjusting the opening degree of outdoor electronic expansion valve according to a relationship between the subcooling degree of the outdoor heat exchanger and the first target subcooling degree interval, includes:
 if the subcooling degree of the outdoor heat exchanger is greater than an upper limit of the first target subcooling degree interval, increasing the opening degree of the outdoor electronic expansion valve;   if the subcooling degree of the outdoor heat exchanger is less than a lower limit of the first target subcooling degree interval, reducing the opening degree of the outdoor electronic expansion valve; and   if the subcooling degree of the outdoor heat exchanger is greater than or equal to the lower limit of the first target subcooling degree interval, and is less than or equal to the upper limit of the first target subcooling degree interval, controlling the opening degree of the outdoor electronic expansion valve to remain unchanged.   
     
     
         19 . The method according to  claim 16 , wherein the adjusting the opening degree of the indoor electronic expansion valve according to the relationship between the exhaust superheat degree of the compressor and the target exhaust superheat degree interval, includes:
 if the exhaust superheat degree of the compressor is greater than an upper limit of the target superheat degree interval, increasing the opening degree of the indoor electronic expansion valve;   if the exhaust superheat degree of the compressor is less than a lower limit of the target superheat degree interval, reducing the opening degree of the indoor electronic expansion valve; and   if the exhaust superheat degree of the compressor is greater than or equal to the upper limit of the target superheat degree interval and less than or equal to the lower limit of the target superheat degree interval, controlling the opening degree of the indoor electronic expansion valve to remain unchanged.   
     
     
         20 . The method according to  claim 16 , wherein the compressor compresses the refrigerant and discharges the compressed refrigerant, and the indoor heat exchanger condenses the compressed refrigerant; the indoor electronic expansion valve and the outdoor electronic expansion valve adjust the amount of refrigerant condensed by the outdoor heat exchanger, and the outdoor heat exchanger evaporates the refrigerant adjusted by the outdoor electronic expansion valve; the method further comprises:
 obtaining the opening degree of the outdoor electronic expansion valve;   in a case where a third preset condition is satisfied, adjusting the opening degree of the indoor electronic expansion valve according to a relationship between the subcooling degree of the indoor heat exchanger and the second target subcooling degree interval, and adjusting the opening degree of the outdoor electronic expansion valve according to the relationship between the exhaust superheat degree of the compressor and the target exhaust superheat degree interval;   in a case where the third preset condition is not satisfied, adjusting the opening degree of the outdoor electronic expansion valve and the opening degree of the indoor electronic expansion valve according to the relationship between the exhaust superheat degree of the compressor and the target exhaust superheat degree interval; and   wherein the third preset condition includes that the opening degree of the outdoor electronic expansion valve is less than a third preset opening degree.