US-12618570-B2 - Air conditioner

Abstract

An air conditioner includes an outdoor unit, a plurality of indoor units, and a controller. The outdoor unit includes a first throttling device. The indoor unit includes a second throttling device. The controller is configured to: regulate an opening degree of the first throttling device, so that a first supercooling temperature is within a first supercooling temperature range in a case where the air conditioner is in a cooling mode; regulate opening degrees of a plurality of second throttling devices in a case where the air conditioner is in a heating mode, so that a plurality of second supercooling temperatures are each within a second supercooling temperature range, and an absolute value of a difference between each of the plurality of second supercooling temperatures and an average value of the plurality of second supercooling temperatures is less than or equal to a first threshold.

Inventors

• Jiangnan Wang
• Yanjin CHE
• Min Zhou
• Yongkun GAO
• Heng Zhang

Assignees

• Qingdao Hisense Hitachi Air-conditioning Systems Co., Ltd.

Dates

Publication Date

20260505

Application Date

20240118

Priority Date

20211207

Claims (19)

1. 1 . An air conditioner, comprising: an outdoor unit, including: a compressor configured to compress a refrigerant, so as to drive the refrigerant to circulate in the air conditioner; a first heat exchanger configured to perform one of liquefaction and vaporization of the refrigerant; a liquid storage device configured to store the refrigerant; and a first throttling device, a first end of the first throttling device communicating with a liquid side of the first heat exchanger, and a second end of the first throttling device communicating with the liquid storage device; a plurality of indoor units communicating with the outdoor unit, each of the plurality of indoor units including: a second heat exchanger configured to perform another one of the liquefaction and the vaporization of the refrigerant; and a second throttling device, a first end of the second throttling device communicating with a liquid side of the second heat exchanger, and a second end of the second throttling device communicating with the liquid storage device; and a controller coupled to the first throttling device and the second throttling device, the controller being configured to regulate amount of the refrigerant in the in the liquid storage device by regulating an opening degree of at least one of the first throttling device or the second throttling device, so as to regulate the amount of refrigerant participating in a cycle in the air conditioner; wherein the first throttling device is configured to regulate a flow rate of the refrigerant flowing through the first throttling device through the controller, the second throttling device is configured to regulate a flow rate of the refrigerant flowing through the second throttling device through the controller; the controller is further configured to: regulate the opening degree of the first throttling device, in a case where the air conditioner is in a cooling mode, so that a first supercooling temperature of the liquid side of the first heat exchanger is within a preset first supercooling temperature range; and regulate the opening degree of the second throttling device, in a case where the air conditioner is in a heating mode, so that a plurality of second supercooling temperatures of the liquid sides of the plurality of second heat exchangers each are within a preset second supercooling temperature range, and an absolute value of a difference between each of the plurality of second supercooling temperatures and an average value of the plurality of second supercooling temperatures is less than or equal to a preset first threshold.
2. 2 . The air conditioner according to claim 1 , wherein the controller is configured to: control the opening degree of the first throttling device to be increased, if it is determined that the first supercooling temperature is greater than an upper limit of the first supercooling temperature range, in a case where the air conditioner is in the cooling mode; and control the opening degree of the first throttling device to be reduced, if it is determined that the first supercooling temperature is less than a lower limit of the first supercooling temperature range.
3. 3 . The air conditioner according to claim 1 , wherein the controller is configured to: control the opening degree of the second throttling device of a Nth indoor unit to be increased, if it is determined that the second supercooling temperature of the Nth indoor unit of the plurality of indoor units is greater than an upper limit of the second supercooling temperature range, in a case where the air conditioner is in the heating mode; and control the opening degree of the second throttling device of the Nth indoor unit to be reduced, if it is determined that the second supercooling temperature of the Nth indoor unit is less than a lower limit of the second supercooling temperature range.
4. 4 . The air conditioner according to claim 1 , wherein the controller is further configured to: regulate the opening degree of the second throttling device, in a case where the air conditioner is in the cooling mode, so that a first superheat temperature of a gaseous side of the second heat exchanger is within a preset first superheat temperature range; and regulate the opening degree of the first throttling device, in a case where the air conditioner is in the heating mode, so that a second superheat temperature at an air outlet of the compressor is within a preset second superheat temperature range.
5. 5 . The air conditioner according to claim 4 , wherein the controller is configured to: control the opening degree of the second throttling device of a Nth indoor unit to be increased, if it is determined that the first superheat temperature of the Nth indoor unit of the plurality of indoor units is greater than an upper limit of the first superheat temperature range, in a case where the air conditioner is in the cooling mode; and control the opening degree of the second throttling device of the Nth indoor unit to be reduced, if it is determined that the first superheat temperature of the Nth indoor unit is less than a lower limit of the first superheat temperature range.
6. 6 . The air conditioner according to claim 4 , wherein the controller is configured to: control the opening degree of the first throttling device to be increased, if it is determined that the second superheat temperature is greater than an upper limit of the second superheat temperature range, in a case where the air conditioner is in the heating mode; and control the opening degree of the first throttling device to be reduced, if it is determined that the second superheat temperature is less than a lower limit of the second superheat temperature range.
7. 7 . The air conditioner according to claim 1 , wherein the controller is configured to: control the opening degree of the second throttling device of a Nth indoor unit to be increased, if it is determined that the difference between the second supercooling temperature of the Nth indoor unit of the plurality of indoor units and the average value is greater than the first threshold; and control the opening degree of the second throttling device of the Nth indoor unit to be reduced, if it is determined that a difference between the average value and the second supercooling temperature of the Nth indoor unit is greater than the first threshold.
8. 8 . The air conditioner according to claim 1 , wherein the liquid storage device includes a body and a heat exchange pipe disposed in the body, and the outdoor unit further includes: a third throttling device, a first end of the third throttling device communicating with the liquid side of the first heat exchanger, and a second end of the third throttling device communicating with an input end of the heat exchange pipe, an output end of the heat exchange pipe communicating with an air inlet of the compressor, the third throttling device being configured to control a flow rate of the refrigerant flowing into the heat exchange pipe in a case where a fourth throttling device is closed; and the fourth throttling device, a first end of the fourth throttling device communicating with the input end of the heat exchange pipe, and a second end of the fourth throttling device communicating with the liquid side of the second heat exchanger, the fourth throttling device being configured to control the flow rate of the refrigerant flowing into the heat exchange pipe in a case where the third throttling device is closed; wherein the controller is further configured to: control the fourth throttling device to be closed and the third throttling device to be opened, in a case where the air conditioner is in the cooling mode and the first supercooling temperature is within the first supercooling temperature range, so as to subcool the refrigerant outside the heat exchange pipe and supplement a gaseous refrigerant to the compressor; and control the third throttling device to be closed and the fourth throttling device to be opened, in a case where the air conditioner is in the heating mode and the second supercooling temperature is within the second supercooling temperature range, so as to subcool the refrigerant outside the heat exchange pipe and supplement the gaseous refrigerant to the compressor.
9. 9 . The air conditioner according to claim 8 , wherein the controller is configured to: control the third throttling device to be opened at a first opening degree, in a case where the air conditioner is in the cooling mode and the first supercooling temperature is within the first supercooling temperature range; obtain a first temperature at the input end of the heat exchange pipe and a second temperature at the output end of the heat exchange pipe; control an opening degree of the third throttling device to remain unchanged, if it is determined that a difference between the second temperature and the first temperature is greater than or equal to a preset second threshold; and control the opening degree of the third throttling device to be increased, if it is determined that the difference between the second temperature and the first temperature is less than the second threshold.
10. 10 . The air conditioner according to claim 9 , wherein the controller is further configured to: obtain the first supercooling temperature every preset period and regulate the opening degree of the first throttling device, after controlling the third throttling device to be opened at the first opening degree, so that the first supercooling temperature is within the first supercooling temperature range after the third throttling device is opened.
11. 11 . The air conditioner according to claim 8 , wherein the controller is configured to: control the fourth throttling device to be opened at a second opening degree, in a case where the air conditioner is in the heating mode and the second supercooling temperature is within the second supercooling temperature range; obtain a first temperature at the input end of the heat exchange pipe and a second temperature at the output end of the heat exchange pipe; control the opening degree of the fourth throttling device to remain unchanged, if it is determined that a difference between the second temperature and the first temperature is greater than or equal to a preset second threshold; and control the opening degree of the fourth throttling device to be increased, if it is determined that the difference between the second temperature and the first temperature is less than the second threshold.
12. 12 . The air conditioner according to claim 11 , wherein the controller is further configured to: obtain the second supercooling temperature every preset period and regulate the opening degree of the second throttling device, after controlling the fourth throttling device to be opened at the second opening degree, so that the second supercooling temperature is within the second supercooling temperature range after the fourth throttling device is opened.
13. 13 . The air conditioner according to claim 1 , wherein the liquid storage device includes: a body including a plurality of openings, the body communicating with the first throttling device and the second throttling device through the plurality of openings, respectively; a heat exchange pipe disposed in the body, an input end of the heat exchange pipe extending outside the body and communicating with the liquid side of the first heat exchanger or the liquid side of the second heat exchanger, an output end of the heat exchange pipe extending outside the body and communicating with an air inlet of the compressor, the heat exchange pipe being configured to supercool the refrigerant outside the heat exchange pipe and supply a gaseous refrigerant to the compressor; and a separator disposed in the body, the separator including a plurality of air holes, and the separator being configured to perform gas-liquid separation on the refrigerant in the body, so as to separate the refrigerant in the body into the gaseous refrigerant and a liquid refrigerant.
14. 14 . The air conditioner according to claim 13 , wherein the outdoor unit further includes a first transporting pipe, and the a second end of the first throttling device communicates with the liquid storage device through the first transporting pipe; the indoor unit further includes a second transporting pipe, and the a second end of the second throttling device communicates with the liquid storage device through the second transporting pipe; an end of the first transporting pipe away from the first heat exchanger and an end of the second transporting pipe away from the second heat exchanger extend into an inside of the body through the separator; and the heat exchange pipe is located between the separator and a bottom of the body, and the input end of the heat exchange pipe and the output end of the heat exchange pipe extend outside the body through the separator.
15. 15 . The air conditioner according to claim 13 , wherein an outer contour of the separator matches with an inner contour of the body.
16. 16 . The air conditioner according to claim 13 , wherein a density of a material of the separator is less than a density of the liquid refrigerant and greater than a density of the gaseous refrigerant, so that the separator floats at a junction of the gaseous refrigerant and the liquid refrigerant.
17. 17 . The air conditioner according to claim 13 , wherein a material of the separator includes a magnetic material; the liquid storage device further includes a plurality of solenoids disposed on a side wall of the body and configured to generate a magnetic field after being powered on, so that the separator moves with a change of the magnetic field.
18. 18 . The air conditioner according to claim 13 , wherein the liquid storage device further includes a guiding member disposed on a bottom of the body, the separator is sleeved onto the guiding member, and the guiding member is configured to limit a moving direction of the separator.
19. 19 . The air conditioner according to claim 13 , wherein the liquid storage device further includes an energy storage member, a first end of the energy storage member is fixedly connected to a surface of a side of the separator adjacent to a bottom of the body, and a second end of the energy storage member is fixedly connected to the bottom of the body; the energy storage member is configured to store kinetic energy during a movement of the separator, so as to provide power for the separator to move in a direction toward or away from the bottom of the body.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation application of International Patent Application No. PCT/CN2022/130394, filed on Nov. 7, 2022, which claims priority to Chinese Patent Application No. 202111484727.8, filed on Dec. 7, 2021; Chinese Patent Application No. 202210000948.1, filed on Jan. 4, 2022; and Chinese Patent Application No. 202220357510.4, filed on Feb. 22, 2022, which are incorporated herein by reference in their entireties. TECHNICAL FIELD The present disclosure relates to the field of air conditioning technologies and, in particular, to an air conditioner. BACKGROUND Air conditioners utilize vaporization and liquefaction of refrigerant to absorb or release heat, so as to regulate a temperature of indoor space. Therefore, the appropriate amount of refrigerant is the basis for the stable and efficient operation of the air conditioners. If the amount of refrigerant involved in the cycle in the air conditioner exceeds the amount of refrigerant required by the air conditioner, it may lead to the presence of liquid refrigerant at an air inlet of the compressor, thereby causing damage to the compressor. If the amount of refrigerant involved in the cycle in the air conditioner is less than the amount of refrigerant required by the air conditioner, it may lead to insufficient refrigerant in the indoor unit, which may not satisfy the cooling or heating needs of the user. SUMMARY An air conditioner is provided. The air conditioner includes an outdoor unit, a plurality of indoor units, and a controller. The outdoor unit includes a compressor, a first heat exchanger, a liquid storage device, and a first throttling device. The compressor is configured to compress a refrigerant, so as to drive the refrigerant to circulate in the air conditioner. The first heat exchanger is configured to perform one of liquefaction and vaporization of the refrigerant. The liquid storage device is configured to store the refrigerant. A first end of the first throttling device communicates with a liquid side of the first heat exchanger, and a second end of the first throttling device communicates with the liquid storage device. The first throttling device is configured to regulate a flow rate of the refrigerant flowing through the first throttling device. The plurality of indoor units communicate with the outdoor unit, and each of the plurality of indoor units includes a second heat exchanger and a second throttling device. The second heat exchanger is configured to perform another one of the liquefaction and the vaporization of the refrigerant. A first end of the second throttling device communicates with a liquid side of the second heat exchanger, and a second end of the second throttling device communicates with the liquid storage device. The second throttling device is configured to regulate a flow rate of the refrigerant flowing through the second throttling device. The controller is coupled to the first throttling device and the second throttling device. The controller is configured to regulate an amount of the refrigerant in the in the liquid storage device by regulating an opening degree of at least one of the first throttling device or the second throttling device, so as to regulate the amount of refrigerant participating in a cycle in the air conditioner. The controller is further configured to: regulate the opening degree of the first throttling device, in a case where the air conditioner is in a cooling mode, so that a first supercooling temperature of the liquid side of the first heat exchanger is within a preset first supercooling temperature range; and regulate the opening degrees of the plurality of second throttling devices, in a case where the air conditioner is in a heating mode, so that a plurality of second supercooling temperatures of the liquid sides of the plurality of second heat exchangers each are within a preset second supercooling temperature range, and an absolute value of a difference between each of the plurality of second supercooling temperatures and an average value of the plurality of second supercooling temperatures is less than or equal to a preset first threshold. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a structure of an air conditioner in the related art; FIG. 2 is a block diagram of an air conditioner in the related art; FIG. 3 is a diagram showing a structure of an air conditioner, in accordance with some embodiments; FIG. 4 is a block diagram of an air conditioner, in accordance with some embodiments; FIG. 5 is a pressure-enthalpy diagram of a refrigerant, in accordance with some embodiments; FIG. 6 is another pressure-enthalpy diagram of a refrigerant, in accordance with some embodiments; FIG. 7 is yet another pressure-enthalpy diagram of a refrigerant, in accordance with some embodiments; FIG. 8 is yet another pressure-enthalpy diagram of a refrigerant, in accordance with some embodiments; FIG. 9 is a flow chart showing steps perf