Multi-split air conditioning unit, control method of multi-split air conditioning unit and storage medium

Abstract

The invention relates to a multi-split air conditioning unit, a control method of the multi-split air conditioning unit and a storage medium. The multi-split air conditioning unit comprises a compressor, a subcooler, a first phase change module, a second phase change module, an indoor heat exchange branch, a first air supply loop, a control unit and a plurality of switch units. Wherein the indoor heat exchange branch is arranged between an exhaust port of the compressor and a first port of the subcooler, and the first air supply loop is arranged between a second port of the subcooler and an air supply port of the compressor; the first phase change module is arranged on the indoor heat exchange branch and the first air supply loop in a coupling mode, and the second phase change module is arranged on the first air supply loop in an embedded mode. The multiple switch units are arranged on the indoor heat exchange branch and the first air supply loop and electrically connected with the control unit. In this way, the complex working condition of a wide temperature range can be covered, and the comprehensive performance of the multi-split air conditioning unit is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to a multi-split air conditioning unit, a control method of the multi-split air conditioning unit and a storage medium. BACKGROUND

[0002] The multi-split air conditioning unit is widely used in commercial and household fields due to its flexible installation and high energy efficiency. However, the existing multi-split air conditioning unit usually uses single-stage phase change materials for heat storage or cold storage, and thus cannot cover complex working conditions in a wide temperature range, and is prone to have low comprehensive performance. Therefore, how to improve the comprehensive performance of the multi-split air conditioning unit becomes a technical problem to be solved. SUMMARY

[0003] The present application provides a multi-split air conditioning unit, a control method of the multi-split air conditioning unit and a storage medium to solve the problem that the existing multi-split air conditioning unit usually uses single-stage phase change materials for heat storage or cold storage, and is prone to have low comprehensive performance.

[0004] In a first aspect, the embodiments of the present application provide a multi-split air conditioning unit, which comprises a compressor, an overcooler, a first phase change module, a second phase change module, an indoor heat exchange branch, a first air supplementing circuit, a control unit and a plurality of switch units.

[0005] The indoor heat exchange branch is arranged between the exhaust port of the compressor and the first port of the overcooler, and the first air supplementing circuit is arranged between the second port of the overcooler and the air supplementing port of the compressor.

[0006] The first phase change module is coupled and arranged on the indoor heat exchange branch and the first air supplementing circuit, and the second phase change module is embedded and arranged on the first air supplementing circuit.

[0007] The plurality of switch units are arranged on the indoor heat exchange branch and the first air supplementing circuit, and the plurality of switch units are electrically connected to the control unit.

[0008] Optionally, the indoor heat exchange branch comprises a first pipeline, the first air supplementing circuit comprises a second pipeline, and the plurality of switch units comprise a first switch unit, a second switch unit and a third switch unit.

[0009] The first end of the first pipeline is connected to a first connection point on the indoor heat exchange branch, and the second end of the first pipeline is connected to a second connection point on the indoor heat exchange branch, and the first connection point and the second connection point are located downstream of the exhaust port of the compressor.

[0010] The first end of the second pipeline is connected with the second port of the supercooler, and the second end of the second pipeline is connected with the air supplementing port of the compressor.

[0011] The first phase change module is coupled and arranged on the first pipeline and the second pipeline, the first switch unit is arranged on the first pipeline, the second switch unit and the third switch unit are arranged on the second pipeline, and the second switch unit and the third switch unit are located upstream and downstream of the first phase change module respectively.

[0012] Optionally, the first air supplementing circuit further comprises a third pipeline, and the plurality of switch units further comprises a fourth switch unit.

[0013] The first end of the third pipeline is connected with a third connection point on the second pipeline, the second end of the third pipeline is connected with a fourth connection point on the second pipeline, and the third connection point and the fourth connection point are located upstream and downstream of the third switch unit respectively.

[0014] The second phase change module and the fourth switch unit are arranged on the third pipeline.

[0015] Optionally, the first air supplementing circuit further comprises a fourth pipeline, and the plurality of switch units further comprises a fifth switch unit.

[0016] The first end of the fourth pipeline is connected with the second port of the supercooler, the second end of the fourth pipeline is connected with a fifth connection point on the third pipeline, and the fifth connection point is located between the second phase change module and the fourth switch unit.

[0017] The fifth switch unit is arranged on the third pipeline.

[0018] Optionally, the multi-split air conditioning unit further comprises a third phase change module and an outdoor heat exchange branch; the outdoor heat exchange branch is arranged between the third port of the supercooler and the air suction port of the compressor, and the third phase change module is embedded and arranged on the outdoor heat exchange branch.

[0019] Optionally, the multi-split air conditioning unit further comprises an outdoor heat exchanger and a gas-liquid separator, and the outdoor heat exchange branch comprises a fifth pipeline, a sixth pipeline and a seventh pipeline.

[0020] The first end of the fifth pipeline is connected with the third port of the supercooler, and the second end of the fifth pipeline is connected with a first port of the outdoor heat exchanger.

[0021] The first end of the sixth pipeline is connected with a second port of the outdoor heat exchanger, and the second end of the sixth pipeline is connected with an air suction port of the gas-liquid separator.

[0022] The first end of the seventh pipeline is connected with the exhaust port of the gas-liquid separator, and the second end of the seventh pipeline is connected with the suction port of the compressor.

[0023] The third phase change module is embedded on the fifth pipeline.

[0024] Optionally, the multi-split air conditioning unit further comprises a second recharging circuit, and the plurality of switch units further comprises a sixth switch unit.

[0025] The second recharging circuit is arranged between the second port of the supercooler and the recharging port of the gas-liquid separator.

[0026] The sixth switch unit is arranged on the second recharging circuit.

[0027] Optionally, the phase change material selected by the first phase change module is erythritol, the phase change material selected by the second phase change module is modified paraffin, and the phase change material selected by the third phase change module is calcium chloride hexahydrate solution.

[0028] Optionally, the phase change temperature of the first phase change module is 50-70℃, the phase change temperature of the second phase change module is 20-50℃, and the phase change temperature of the third phase change module is -20-20℃.

[0029] In a second aspect, the embodiments of the present application further provide a control method of a multi-split air conditioning unit, the method being applied to the multi-split air conditioning unit of the first aspect, and the method comprising:

[0030] Obtaining an outdoor environment temperature and a recharging temperature;

[0031] Controlling the working states of the first phase change module and the second phase change module according to the outdoor environment temperature and the recharging temperature.

[0032] Optionally, the controlling the working states of the first phase change module and the second phase change module according to the outdoor environment temperature and the recharging temperature comprises:

[0033] In the case that the outdoor environment temperature is less than a first preset temperature and the recharging temperature is less than a second preset temperature, starting the first phase change module to perform heat exchange between the refrigerant in the indoor heat exchange branch and the refrigerant on the first recharging circuit; and / or,

[0034] in a case that the outdoor environment temperature is less than the first preset temperature and the supplement air temperature is greater than a third preset temperature, starting the first phase change module to perform heat exchange on the refrigerant in the indoor heat exchange branch and the refrigerant on the first supplement air circuit, and starting the second phase change module to perform heat absorption on the refrigerant in the first supplement air circuit after heat exchange, wherein the third preset temperature is greater than the second preset temperature; and / or,

[0035] in a case that the outdoor environment temperature is greater than or equal to the first preset temperature, starting the first phase change module to perform heat absorption on the refrigerant in the indoor heat exchange branch, and starting the second phase change module to perform heat absorption on the refrigerant in the first supplement air circuit.

[0036] Optionally, the method further comprises:

[0037] acquiring a working mode of the multi-split air conditioning unit;

[0038] controlling a working state of a third phase change module according to the working mode of the multi-split air conditioning unit.

[0039] Optionally, the controlling the working state of the third phase change module according to the working mode of the multi-split air conditioning unit comprises:

[0040] in a case that the working mode of the multi-split air conditioning unit is a heating mode, starting the third phase change module to perform heat absorption on the refrigerant in the indoor heat exchange branch after heat exchange; and / or,

[0041] in a case that the working mode of the multi-split air conditioning unit is a defrosting mode, starting the third phase change module to perform heat release on the refrigerant in the outdoor heat exchange branch after heat exchange; and / or,

[0042] in a case that the working mode of the multi-split air conditioning unit is a refrigeration mode, starting the third phase change module to perform heat absorption on the refrigerant in the outdoor heat exchange branch after heat exchange.

[0043] In a third aspect, an embodiment of the present application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the control method of the multi-split air conditioning unit according to the second aspect.

[0044] Compared with the prior art, the above technical solution provided in the embodiments of the present application has the following advantages: the multi-split air conditioning unit provided in the embodiments of the present application comprises a compressor, a supercooler, a first phase change module, a second phase change module, an indoor heat exchange branch, a first air supplementing circuit, a control unit and a plurality of switch units; the indoor heat exchange branch is arranged between an exhaust port of the compressor and a first port of the supercooler, and the first air supplementing circuit is arranged between a second port of the supercooler and an air supplementing port of the compressor; the first phase change module is coupled and arranged on the indoor heat exchange branch and the first air supplementing circuit, and the second phase change module is embedded and arranged on the first air supplementing circuit; the plurality of switch units are arranged on the indoor heat exchange branch and the first air supplementing circuit, and the plurality of switch units are electrically connected with the control unit. In this way, the first phase change module and the second phase change module with different phase change temperatures can be used to absorb heat or release heat of refrigerant in the indoor heat exchange branch and the first air supplementing circuit, so that complex working conditions in a wide temperature range can be covered, and the comprehensive performance of the multi-split air conditioning unit is improved. BRIEF DESCRIPTION OF DRAWINGS

[0045] The drawings incorporated into the specification and forming a part thereof illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, those skilled in the art can obtain other drawings from these drawings without any creative effort.

[0047] One or more embodiments are illustrated by way of example in the drawings that are for illustrative purposes only, and are not construed to limit the embodiments, elements in the drawings with the same reference numerals denote similar elements, unless otherwise specified, the drawings do not constitute a proportion limit.

[0048] Figure 1 A structural schematic diagram of a multi-split air conditioning unit provided in the embodiments of the present application is shown in the figure.

[0049] Figure 2 A structural schematic diagram of another multi-split air conditioning unit provided in the embodiments of the present application is shown in the figure.

[0050] Figure 3 A flowchart of a control method of a multi-split air conditioning unit provided in the embodiments of the present application is shown in the figure.

[0051] Explanation of reference numerals:

[0052] 100, compressor; 110, subcooler; 120, first phase change module; 130, second phase change module; 140, third phase change module; 150, indoor heat exchange branch; 160, outdoor heat exchange branch; 170, first hydrogen supplement circuit; 1501, first pipeline; 1701, second pipeline; 1801, first switch unit; 1802, second switch unit; 1803, third switch unit; 1702, third pipeline; 1804, fourth switch unit; 1703, fourth pipeline; 1805, fifth switch unit; 190, outdoor heat exchanger; 200, gas-liquid separator; 1601, fifth pipeline; 1602, sixth pipeline; 1603, seventh pipeline; 220, four-way reversing valve; 230, oil separator; 240, indoor heat exchanger; 250, first electronic expansion valve; 260, second electronic expansion valve; 210, second hydrogen supplement circuit; 1806, sixth switch unit. DETAILED DESCRIPTION

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0054] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described in the following. Of course, they are only examples, and the purpose is not to limit the present application. In addition, reference numerals and / or letters can be repeated in different examples in the present application. Such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed.

[0055] To solve the problem that the existing multi-split air conditioning unit usually uses single-stage phase change material for heat storage or cold storage, and is prone to have low comprehensive performance, the present application provides a multi-split air conditioning unit, a control method of the multi-split air conditioning unit, and a storage medium, which can improve the comprehensive performance of the multi-split air conditioning unit.

[0056] Referring to Figure 1 and Figure 2 , Figure 1 and Figure 2 A structural schematic diagram of a multi-split air conditioning unit provided by the embodiments of the present application is shown in FIG. 1. As shown in FIG. 1, the multi-split air conditioning unit comprises a compressor 100, a subcooler 110, a first phase change module 120, a second phase change module 130, a third phase change module 140, an indoor heat exchange branch 150, an outdoor heat exchange branch 160, a first hydrogen supplement circuit 170, a first pipeline 1501, a second pipeline 1701, a first switch unit 1801, a second switch unit 1802, a third switch unit 1803, a third pipeline 1702, a fourth switch unit 1804, a fourth pipeline 1703, a fifth switch unit 1805, an outdoor heat exchanger 190, a gas-liquid separator 200, a fifth pipeline 1601, a sixth pipeline 1602, a seventh pipeline 1603, a four-way reversing valve 220, an oil separator 230, an indoor heat exchanger 240, a first electronic expansion valve 250, a second electronic expansion valve 260, a second hydrogen supplement circuit 210, and a sixth switch unit 1806. Figure 1 and Figure 2As shown, the multi-split air conditioning unit can include a compressor 100, a subcooler 110, a first phase change module 120, a second phase change module 130, an indoor heat exchange branch 150, a first supplemental gas circuit 170, a control unit (not shown in the figure), and a plurality of switch units (not shown in the figure).

[0057] The indoor heat exchange branch 150 is arranged between the exhaust port of the compressor 100 and the first port of the subcooler 110, and the first supplemental gas circuit 170 is arranged between the second port of the subcooler 110 and the supplemental gas port of the compressor 100.

[0058] The first phase change module 120 is coupled and arranged on the indoor heat exchange branch 150 and the first supplemental gas circuit 170, and the second phase change module 130 is embedded and arranged on the first supplemental gas circuit 170.

[0059] The plurality of switch units are arranged on the indoor heat exchange branch 150, the outdoor heat exchange branch 160, and the first supplemental gas circuit 170, and are electrically connected to the control unit.

[0060] Specifically, the first phase change module 120 and the second phase change module 130 can be phase change modules formed by selecting different phase change materials or the same phase change material, and the main function is to realize heat energy management through the energy storage characteristics of the phase change material (i.e. the characteristics of absorbing / releasing latent heat when the phase change material converts between solid and liquid states). As an optional embodiment, the first phase change module 120 can be a high-temperature phase change module, and the second phase change module 130 can be a medium-temperature phase change module.

[0061] The indoor heat exchange branch 150 refers to a branch for realizing indoor heat exchange, and the indoor heat exchange branch 150 can be provided with an oil separator 230, a four-way reversing valve 220, an indoor heat exchanger 240, a first electronic expansion valve 250, and the like. The first supplemental gas circuit 170 refers to a branch for realizing supplemental gas enthalpy increase, and the first supplemental gas circuit 170 can include a plurality of pipelines, each of which is provided with at least one switch unit.

[0062] The control unit can be an existing control unit of the multi-split air conditioning unit, or a newly added control unit of the multi-split air conditioning unit. The number and arrangement position of the plurality of switch units can be set according to actual needs, and the embodiments of the present application are not limited specifically. The switch unit here can be an electromagnetic valve or the like.

[0063] The first phase change module 120 is coupled and arranged on the indoor heat exchange branch 150 and the first gas supplement circuit 170, so that the first phase change module 120 can absorb heat from the refrigerant in the indoor heat exchange branch 150 and release heat to the refrigerant in the first gas supplement circuit 170 to realize heat exchange between the indoor heat exchange branch 150 and the first gas supplement circuit 170. The second phase change module 130 is embedded and arranged on the first gas supplement circuit 170, so that the second phase change module 130 can absorb heat from the refrigerant in the first gas supplement circuit 170 after heat exchange.

[0064] In this way, the first phase change module 120 and the second phase change module 130 with different phase change temperatures can be used to absorb heat or release heat from the refrigerant in the indoor heat exchange branch 150 and the first gas supplement circuit 170, so as to cover complex working conditions in a wide temperature range, and improve the comprehensive performance of the multi-split air conditioning unit.

[0065] In an optional embodiment, referring to Figure 2 , the indoor heat exchange branch 150 includes a first pipeline 1501, the first gas supplement circuit 170 includes a second pipeline 1701, and the plurality of switch units include a first switch unit 1801, a second switch unit 1802 and a third switch unit 1803;

[0066] The first end of the first pipeline 1501 is connected with a first connection point on the indoor heat exchange branch 150, and the second end of the first pipeline 1501 is connected with a second connection point on the indoor heat exchange branch 150. The first connection point and the second connection point are both located downstream of the exhaust port of the compressor 100.

[0067] The first end of the second pipeline 1701 is connected with the second port of the supercooler 110, and the second end of the second pipeline 1701 is connected with the gas supplement port of the compressor 100.

[0068] The first phase change module 120 is coupled and arranged on the first pipeline 1501 and the second pipeline 1701. The first switch unit 1801 is arranged on the first pipeline 1501, and the second switch unit 1802 and the third switch unit 1803 are arranged on the second pipeline 1701. The second switch unit 1802 and the third switch unit 1803 are respectively located upstream and downstream of the first phase change module 120.

[0069] Specifically, a part of the high-temperature and high-pressure refrigerant discharged from the discharge port of the compressor 100 returns to the discharge pipeline of the compressor 100 through the first pipeline 1501, and another part enters the indoor-side heat exchanger 240 through the oil separator 230 and the four-way reversing valve 220 to be condensed and release heat to heat the indoor. Then, a part of the refrigerant output from the indoor-side heat exchanger 240 can enter the outdoor-side heat exchanger 190 through the third phase change module 140, evaporate into gas by absorbing the heat of outdoor air, and then return to the suction port of the compressor 100 through the four-way reversing valve 220 and the gas-liquid separator 200, while another part of the refrigerant output from the indoor-side heat exchanger can enter the second pipeline 1701 through the subcooler 110, and then enter the suction port of the compressor 100 through the second pipeline.

[0070] In this way, when the high-temperature and high-pressure refrigerant flows through the first pipeline 1501, the first phase change module 120 absorbs the heat in the high-temperature and high-pressure refrigerant and stores it. When the low-temperature and low-pressure refrigerant after indoor heat exchange flows through the second pipeline 1701, the first phase change module 120 releases the heat stored previously, so as to increase the temperature of the suction-increment enthalpy refrigerant. In this way, the risk of liquid hammer caused by the refrigerant carrying liquid in the first suction circuit 170 in a low-temperature environment can be reduced, and the reliability of the multi-split air conditioning unit can be ensured while reducing the power consumption fluctuation of the compressor 100.

[0071] In an optional embodiment, continuing to refer to Figure 2 , the first suction circuit 170 further includes a third pipeline 1702, and the plurality of switch units further includes a fourth switch unit 1804.

[0072] The first end of the third pipeline 1702 is connected with the third connection point on the second pipeline 1701, and the second end of the third pipeline 1702 is connected with the fourth connection point on the second pipeline 1701, and the third connection point and the fourth connection point are located upstream and downstream of the third switch unit 1803, respectively.

[0073] The second phase change module 130 and the fourth switch unit 1804 are both arranged on the third pipeline 1702.

[0074] Specifically, the second phase change module 130 described above can be directly coupled with the third pipeline 1702 through a jacketed heat exchanger.

[0075] A third pipeline 1702 is arranged in parallel with the third switch unit 1803. When the temperature of the refrigerant heated by the first phase change module 120 is too high, the refrigerant can bypass the gas supplement port of the compressor 100 directly from the second pipeline 1701, and instead flow into the gas supplement port of the compressor 100 from the third pipeline 1702 after being heated by the second phase change module 130. When the temperature of the refrigerant heated by the first phase change module 120 is too low, the refrigerant can bypass the gas supplement port of the compressor 100 directly from the second pipeline 1701, and instead flow into the gas supplement port of the compressor 100 from the third pipeline 1702 after being heated by the second phase change module 130.

[0076] In this way, the second phase change module 130 can dynamically absorb or release heat to balance the superheat and subcooling of the refrigerant in the first gas supplement circuit 170, suppress the frequency fluctuation of the compressor 100 caused by load mutation, and improve the operation stability and energy efficiency consistency of the unit.

[0077] In an optional embodiment, continuing to refer to Figure 2 , the first gas supplement circuit 170 further includes a fourth pipeline 1703, and the plurality of switch units further includes a fifth switch unit 1805.

[0078] The first end of the fourth pipeline 1703 is connected to the second port of the subcooler 110, and the second end of the fourth pipeline 1703 is connected to a fifth connection point on the third pipeline 1702, which is located between the second phase change module 130 and the fourth switch unit 1804.

[0079] The fifth switch unit 1805 is arranged on the third pipeline 1702.

[0080] Specifically, since one end of the fifth switch unit 1805 is connected to the second port of the subcooler 110, and the other end of the fifth switch unit 1805 is connected to the second phase change module 130, when the ambient temperature is high, the refrigerant entering the first gas supplement circuit 170 from the subcooler 110 can bypass the second pipeline 1701 for heating, and instead flow through the fifth switch unit 1805 on the fourth pipeline 1703, and then flow into the gas supplement port of the compressor 100 after being heated or cooled by the second phase change module 130, thereby reducing the fluctuation of the gas supplement temperature.

[0081] In an optional embodiment, the multi-split air conditioning unit further includes a third phase change module 140 and an outdoor heat exchange branch 160. The outdoor heat exchange branch 160 is arranged between the third port of the subcooler 110 and the suction port of the compressor 100, and the third phase change module 140 is embedded on the outdoor heat exchange branch 160.

[0082] Specifically, the third phase change module 140 can be made of different phase change material or the same phase change material as the first phase change module 120 and the second phase change module 130. As an optional embodiment, the third phase change module 140 can be a low-temperature phase change module.

[0083] The outdoor heat exchange branch 160 refers to a branch for realizing outdoor heat exchange, and the second electronic expansion valve 260, the outdoor heat exchanger 190, the four-way reversing valve 220, the gas-liquid separator 200, and the like can be arranged on the outdoor heat exchange branch 160.

[0084] The third phase change module 140 is embedded on the outdoor heat exchange branch 160, so that the third phase change module 140 can absorb or release heat of the refrigerant in the outdoor heat exchange branch 160.

[0085] In this way, the third phase change module 140 can absorb or release heat of the refrigerant in the outdoor heat exchange branch 160, so as to cover complex working conditions in a wide temperature range, and improve the comprehensive performance of the multi-split air conditioning unit.

[0086] In an optional embodiment, continuing to refer to Figure 2 The multi-split air conditioning unit further includes the outdoor heat exchanger 190 and the gas-liquid separator 200, and the outdoor heat exchange branch 160 includes a fifth pipeline 1601, a sixth pipeline 1602, and a seventh pipeline 1603.

[0087] The first end of the fifth pipeline 1601 is connected with the third port of the supercooler 110, and the second end of the fifth pipeline 1601 is connected with the first port of the outdoor heat exchanger 190.

[0088] The first end of the sixth pipeline 1602 is connected with the second port of the outdoor heat exchanger 190, and the second end of the sixth pipeline 1602 is connected with the suction port of the gas-liquid separator 200.

[0089] The first end of the seventh pipeline 1603 is connected with the exhaust port of the gas-liquid separator 200, and the second end of the seventh pipeline 1603 is connected with the suction port of the compressor 100.

[0090] The third phase change module 140 is embedded on the fifth pipeline 1601.

[0091] Specifically, the third phase change module 140 is embedded on the fifth pipeline 1601, i.e., the third phase change module 140 is installed near the inlet of the outdoor heat exchanger 190. In this way, in winter heating, the third phase change module 140 can absorb the pipeline waste heat in the heating process, and in the defrosting process, the four-way valve 220 is switched, the high-temperature and high-pressure gas refrigerant from the compressor 100 enters the outdoor heat exchanger 190 through the four-way valve 220 to condense and release heat, the released heat is used for defrosting, and then the low-temperature and low-pressure liquid after throttling through the second electronic expansion valve 260 enters the third phase change module 140 to evaporate into gas after absorbing the heat of the phase change material, and then returns to the suction port of the compressor 100 through the first electronic expansion valve 250, the indoor heat exchanger 240 and the gas-liquid separator 200. In defrosting, the third phase change module 140 acts as a low-level heat source to provide sufficient heat for the defrosting process and improve the defrosting speed. In summer refrigeration, the heat of the refrigerant flowing out of the outdoor heat exchanger 190 is pre-cooled before the supercooler 110 to achieve double-pole supercooling and greatly improve the supercooling degree in refrigeration.

[0092] In an optional embodiment, the multi-split air conditioning unit further comprises a second refrigerant supplementing circuit 210, and the plurality of switch units further comprises a sixth switch unit 1806.

[0093] The second refrigerant supplementing circuit 210 is arranged between the second port of the supercooler 110 and the refrigerant supplementing port of the gas-liquid separator 200.

[0094] The sixth switch unit 1806 is arranged on the second refrigerant supplementing circuit 210.

[0095] Specifically, part of the refrigerant flowing out of the supercooler 110 can return to the refrigerant supplementing port of the compressor 100 through the first refrigerant supplementing circuit 170, and the other part can return to the gas-liquid separator 200 through the second refrigerant supplementing circuit 210 and then flow into the suction port of the compressor 100.

[0096] In this way, the second refrigerant supplementing circuit 210 can be used to realize gas-liquid two-phase separation, so as to ensure that only saturated gas (or superheated gaseous refrigerant) enters the refrigerant supplementing port of the compressor 100, thereby preventing the risk of liquid hammer and optimizing the refrigerant supplementing efficiency.

[0097] In an optional embodiment, the phase change material selected for the first phase change module 120 is erythritol, the phase change material selected for the second phase change module 130 is modified paraffin, and the phase change material selected for the third phase change module 140 is calcium chloride hexahydrate solution.

[0098] Specifically, the first phase change module 120 can select erythritol as the phase change material. The erythritol (C4H 10O4) is a four-carbon sugar alcohol, belonging to the family of polyols, naturally occurring in some fruits (such as grapes, pears, etc.) and fermented foods (such as soy sauce, wine, etc.), and is usually produced industrially by microbial fermentation (such as using yeast or mold, etc.) from glucose. The phase change enthalpy (latent heat) of erythritol is as high as about 340 kJ / kg, much higher than paraffin and inorganic hydrated salt, which means it can store or release more heat energy, improving the energy storage density.

[0099] The second phase change module 130 described above can select modified paraffin as the phase change material. The modified paraffin is a phase change material obtained by optimizing the traditional paraffin through physical or chemical methods, aiming to improve its thermal conductivity, stability, phase change temperature and other performances to meet the needs of different application scenarios. The latent heat of modified paraffin can reach 150-250 kJ / kg, which is slightly lower than erythritol, but much higher than inorganic hydrated salt (such as mirabilite) and part of fatty acid phase change materials, with strong heat storage capacity per unit volume.

[0100] The third phase change module 140 described above can select calcium chloride hexahydrate solution as the phase change material. The calcium chloride hexahydrate (CaCl2·6H2O) solution is a crystalline hydrate formed by calcium chloride (CaCl2) and water (H2O), which is an important inorganic phase change material widely used in energy storage, temperature control and other fields. The latent heat of calcium chloride hexahydrate can reach 190 kJ / kg, which is comparable to that of paraffin, but the cost is lower.

[0101] In the present embodiment, by selecting different phase change materials as high, medium and low temperature three-stage phase change modules, the extreme refrigeration and heating scenarios are cooperatively covered, the air supply state is accurately adjusted, and the limitations of single-stage phase change materials are broken, so that the energy efficiency stability and comprehensive performance of the multi-split air conditioning unit are better improved.

[0102] In an optional embodiment, the phase change temperature of the first phase change module 120 is 50-70℃, the phase change temperature of the second phase change module 130 is 20-50℃, and the phase change temperature of the third phase change module 140 is -20-20℃.

[0103] Specifically, the phase change temperature of the first phase change module 120 described above can be 50-70℃, the phase change temperature of the second phase change module 130 can be 20-50℃, and the phase change temperature of the third phase change module 140 can be -20-20℃. In this way, the high, medium and low temperature three-stage phase change modules can cover the complex working conditions of a wide temperature range of -20-70℃, break the limitations of single-stage phase change materials, and better improve the energy efficiency stability and comprehensive performance of the multi-split air conditioning unit.

[0104] Referring to Figure 3 , Figure 3 A flowchart of a control method of a multi-split air conditioning unit provided in the present embodiment is shown. As shown inFigure 3 As shown, the control method of the multi-connected air conditioning unit can be applied to the multi-connected air conditioning unit in any of the preceding embodiments, and can include the following steps:

[0105] In step S301, the outdoor environment temperature and the charge air temperature are obtained.

[0106] Specifically, the outdoor environment temperature refers to the temperature of outdoor air, which can be obtained by a temperature sensor installed on the outdoor unit. The charge air temperature refers to the temperature of the refrigerant flowing in from the compressor charge air port, which can be obtained by a temperature sensing bag installed on the compressor charge air port.

[0107] In step S302, the working states of the first phase change module and the second phase change module are controlled according to the outdoor environment temperature and the charge air temperature.

[0108] After obtaining the outdoor environment temperature and the charge air temperature, the working states of the first phase change module and the second phase change module can be controlled according to the outdoor environment temperature and the charge air temperature.

[0109] In this way, the working states of the first phase change module and the second phase change module can be controlled according to the outdoor environment temperature and the charge air temperature, so as to realize heat absorption and heat exchange of the refrigerant in the indoor heat exchange branch and the first charge air circuit, thereby breaking through the application limitation of single-stage phase change materials and significantly improving the comprehensive performance of the unit.

[0110] In an optional embodiment, the step S302 of controlling the working states of the first phase change module and the second phase change module according to the outdoor environment temperature and the charge air temperature includes:

[0111] In the case where the outdoor environment temperature is less than a first preset temperature and the charge air temperature is less than a second preset temperature, the first phase change module is started to exchange heat between the refrigerant in the indoor heat exchange branch and the refrigerant in the first charge air circuit; and / or,

[0112] In the case where the outdoor environment temperature is less than the first preset temperature and the charge air temperature is greater than a third preset temperature, the first phase change module is started to exchange heat between the refrigerant in the indoor heat exchange branch and the refrigerant in the first charge air circuit, and the second phase change module is started to absorb heat from the refrigerant in the first charge air circuit after heat exchange, wherein the third preset temperature is greater than the second preset temperature; and / or,

[0113] In the case where the outdoor environment temperature is greater than or equal to the first preset temperature, the first phase change module is started to absorb heat from the refrigerant in the indoor heat exchange branch, and the second phase change module is started to absorb heat from the refrigerant in the first charge air circuit.

[0114] Specifically, the first preset temperature, the second preset temperature and the third preset temperature can be set according to actual needs, and the present application does not make specific limitations.

[0115] For example, assuming that the first preset temperature is 10℃, the second preset temperature is 10℃, and the third preset temperature is 25℃, when the outdoor ambient temperature is less than 10℃ and the charge air temperature is less than 10℃, the first phase change module can be started to exchange heat between the refrigerant in the indoor heat exchange branch and the refrigerant in the first charge air circuit. At this time, part of the high-temperature and high-pressure refrigerant discharged from the compressor exhaust port returns to the exhaust pipe of the compressor through the first pipeline, and the other part enters the indoor heat exchanger through the oil separator and the four-way valve to condense and release heat to supply heat to the indoor. Part of the refrigerant output from the indoor heat exchanger can enter the outdoor heat exchanger through the third phase change module, absorb the heat of outdoor air, evaporate into gas, and then return to the suction port of the compressor through the four-way valve and the gas-liquid separator, while the other part of the refrigerant output from the indoor heat exchanger can enter the second pipeline through the subcooler and then enter the charge port of the compressor through the second pipeline. In this way, when the high-temperature and high-pressure refrigerant flows through the first pipeline, it will absorb heat from the high-temperature and high-pressure refrigerant through the first phase change module and store it. When the low-temperature and low-pressure refrigerant after indoor heat exchange flows through the second pipeline, it will release the heat stored in the first phase change module, thereby increasing the temperature of the charge air enthalpy increasing refrigerant. In this way, the risk of liquid strike caused by liquid in the first charge air circuit in a low-temperature environment can be reduced, and the reliability of the multi-split air conditioning unit can be ensured while reducing the power consumption fluctuation of the compressor.

[0116] When the outdoor ambient temperature is less than 10℃ and the charge air temperature is greater than 25℃, the first phase change module can be started to exchange heat between the refrigerant in the indoor heat exchange branch and the refrigerant in the first charge air circuit, and the second phase change module can be started to absorb heat from the refrigerant in the first charge air circuit. At this time, the refrigerant heated by the first phase change module can avoid flowing directly into the charge port of the compressor from the second pipeline, but flows into the charge port of the compressor from the third pipeline after being cooled by the second phase change module. In this way, the second phase change module can dynamically absorb or release heat to balance the superheat and subcooling of the refrigerant in the first charge air circuit, inhibit the frequency fluctuation of the compressor caused by load mutation, and improve the operation stability and energy efficiency consistency of the unit.

[0117] When the outdoor ambient temperature is greater than or equal to 10℃, the first phase change module can be started to absorb heat from the refrigerant in the indoor heat exchange branch, and the second phase change module can be started to absorb heat from the refrigerant in the first charge air circuit. In this way, the first phase change module and the second phase change module can dynamically absorb heat to prevent the superheat of the refrigerant in the first charge air circuit from being too large, and can be used to release heat in low temperature to improve the overall energy efficiency of the unit.

[0118] In this way, the working states of the first phase change module and the second phase change module can be flexibly controlled according to the outdoor environment temperature and the supplementary air temperature, and the full-scene adaptability of the unit is improved.

[0119] In an optional embodiment, the method further comprises:

[0120] obtaining a working mode of the multi-split air conditioning unit;

[0121] controlling the working state of the third phase change module according to the working mode of the multi-split air conditioning unit.

[0122] Specifically, the working mode of the multi-split air conditioning unit can include but is not limited to a heating mode, a cooling mode, a defrosting mode, and the like, which can be obtained according to the working state analysis of the multi-split air conditioning unit or obtained according to the received user instruction, and the present application does not make specific limitation.

[0123] In this way, the working state of the third phase change module can be controlled according to the working mode of the multi-split air conditioning unit, so as to realize the heat absorption and heat release of the refrigerant in the outdoor heat exchange branch, thereby breaking through the application limitation of single-stage phase change material and significantly improving the comprehensive performance of the unit.

[0124] In an optional embodiment, the step S302 of controlling the working state of the third phase change module according to the working mode of the multi-split air conditioning unit comprises:

[0125] in the case where the working mode of the multi-split air conditioning unit is the heating mode, starting the third phase change module to absorb heat from the refrigerant after heat exchange in the indoor heat exchange branch; and / or,

[0126] in the case where the working mode of the multi-split air conditioning unit is the defrosting mode, starting the third phase change module to release heat from the refrigerant after heat exchange in the outdoor heat exchange branch; and / or,

[0127] in the case where the working mode of the multi-split air conditioning unit is the cooling mode, starting the third phase change module to absorb heat from the refrigerant after heat exchange in the outdoor heat exchange branch.

[0128] In this way, the third phase change module can absorb the pipeline waste heat in the heating process in winter, the four-way valve is reversed in the defrosting process, the high-temperature and high-pressure gas refrigerant from the compressor enters the outdoor heat exchanger through the four-way valve to condense and release heat, the released heat is used for defrosting, then the low-temperature and low-pressure liquid after throttling through the electronic expansion valve enters the third phase change module to absorb the heat of the phase change material to evaporate into gas, and then returns to the suction port of the compressor through the electronic expansion valve, the indoor heat exchanger and the gas-liquid separator. When the multi-split air conditioning unit is defrosting, the third phase change module acts as a low-temperature heat source to provide sufficient heat for the defrosting process, thereby improving the defrosting speed. When the multi-split air conditioning unit is refrigerating in summer, the third phase change module can absorb the heat of the refrigerant flowing out of the outdoor heat exchanger, pre-subcooling before the subcooler to realize double subcooling, thereby greatly improving the subcooling degree during refrigeration, and the performance of the unit can be greatly improved.

[0129] The multi-split air conditioning unit and the control method thereof provided by the embodiments of the present application can achieve the following technical effects:

[0130] 1. Elimination of liquid risk of gassing refrigerant and improvement of heating reliability: the high-temperature phase change module stores the compressor exhaust waste heat to preheat the low-temperature gassing refrigerant to a safe superheat degree, thereby completely avoiding the liquid refrigerant from entering the compressor and significantly improving the heating energy efficiency and the operation reliability of the compressor.

[0131] 2. Dynamic and accurate adjustment of gassing state under normal working conditions: the medium-temperature phase change module is embedded in the first gassing circuit to balance the superheat degree and the subcooling degree of the gassing refrigerant in real time through phase change heat absorption or heat release, thereby inhibiting the compressor frequency fluctuation caused by load mutation and improving the operation stability and the energy efficiency consistency of the unit.

[0132] 3. Optimization of defrosting efficiency and enhancement of indoor temperature control stability: the low-temperature phase change module absorbs the pipeline waste heat in the heating process, releases heat in the defrosting process to improve the temperature of the refrigerant and shorten the defrosting cycle, thereby solving the temperature drop fluctuation and time problem caused by traditional defrosting.

[0133] 4. Dynamic adaptation of wide-temperature-range multi-working-condition and energy efficiency leap: the high-temperature, medium-temperature and low-temperature three-stage phase change modules cooperatively cover the extreme refrigeration and heating scenes, accurately adjust the gassing state, break the limitation of single-stage phase change material, and realize the leap of the energy efficiency stability and the comprehensive performance of the unit.

[0134] The embodiments of the present application also provide a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the control method of the multi-split air conditioning unit provided by any one of the preceding method embodiments.

[0135] The apparatus embodiments described above are only illustrative, and units described as separate units can or can not be physically separate, and units shown as units can or can not be physical units, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment.

[0136] Through the above description of the embodiments, those skilled in the art can clearly understand that the embodiments can be implemented by means of software plus a general hardware platform, and of course can also be implemented by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product, and the computer software product can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in the embodiments or some parts of the embodiments.

[0137] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically indicated as such. It is also to be understood that additional or alternative steps can be employed.

[0138] The above description is merely illustrative of the application and should not be taken as limiting. Numerous modifications and variations underlying the general principles of the applications can be made by those of ordinary skill in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the present application should not be limited to the embodiments shown herein, but should be consistent with the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-split air conditioning unit, characterized in that, The multi-split air conditioning unit comprises a compressor, a supercooler, a first phase change module, a second phase change module, an indoor heat exchange branch, a first air supplementing circuit, a control unit and a plurality of switch units; The indoor heat exchange branch is arranged between the exhaust port of the compressor and the first port of the supercooler, and the first air supplementing circuit is arranged between the second port of the supercooler and the air supplementing port of the compressor. The first phase change module is coupled and arranged on the indoor heat exchange branch and the first air supplementing circuit, and the second phase change module is embedded and arranged on the first air supplementing circuit. The plurality of switch units are arranged on the indoor heat exchange branch and the first air supplementing circuit, and are electrically connected with the control unit.

2. The multi-split air conditioning unit according to claim 1, wherein, The indoor heat exchange branch comprises a first pipeline, the first air supplementing circuit comprises a second pipeline, and the plurality of switch units comprise a first switch unit, a second switch unit and a third switch unit. The first end of the first pipeline is connected with a first connection point on the indoor heat exchange branch, and the second end of the first pipeline is connected with a second connection point on the indoor heat exchange branch, and the first connection point and the second connection point are both located downstream of the exhaust port of the compressor. The first end of the second pipeline is connected with the second port of the supercooler, and the second end of the second pipeline is connected with the air supplementing port of the compressor. The first phase change module is coupled and arranged on the first pipeline and the second pipeline, the first switch unit is arranged on the first pipeline, the second switch unit and the third switch unit are arranged on the second pipeline, and the second switch unit and the third switch unit are respectively located upstream and downstream of the first phase change module.

3. The multi-split air conditioning unit according to claim 2, wherein, The first air supplementing circuit further comprises a third pipeline, and the plurality of switch units further comprise a fourth switch unit. The first end of the third pipeline is connected with a third connection point on the second pipeline, and the second end of the third pipeline is connected with a fourth connection point on the second pipeline, and the third connection point and the fourth connection point are respectively located upstream and downstream of the third switch unit. The second phase change module and the fourth switch unit are both arranged on the third pipeline.

4. The multi-split air conditioning unit according to claim 3, wherein, The first air supplementing circuit further comprises a fourth pipeline, and the plurality of switch units further comprise a fifth switch unit. The first end of the fourth pipeline is connected with the second port of the supercooler, the second end of the fourth pipeline is connected with a fifth connection point on the third pipeline, and the fifth connection point is located between the second phase change module and the fourth switch unit. The fifth switch unit is arranged on the third pipeline.

5. The multi-split air conditioning unit of claim 1, wherein, The multi-split air conditioning unit further comprises a third phase change module and an outdoor heat exchange branch, and the outdoor heat exchange branch is arranged between the third port of the supercooler and the air suction port of the compressor, and the third phase change module is embedded and arranged on the outdoor heat exchange branch.

6. The multi-split air conditioning unit according to claim 5, wherein, The multi-split air conditioning unit further comprises an outdoor heat exchanger and a gas-liquid separator, and the outdoor heat exchange branch comprises a fifth pipeline, a sixth pipeline and a seventh pipeline. The first end of the fifth pipeline is connected with the third port of the supercooler, and the second end of the fifth pipeline is connected with the first port of the outdoor heat exchanger. The first end of the sixth pipeline is connected with the second port of the outdoor heat exchanger, and the second end of the sixth pipeline is connected with the suction port of the gas-liquid separator. The first end of the seventh pipeline is connected with the exhaust port of the gas-liquid separator, and the second end of the seventh pipeline is connected with the suction port of the compressor. The third phase change module is embedded on the fifth pipeline.

7. The multi-split air conditioning unit according to claim 6, wherein, The multi-split air conditioning unit further comprises a second refrigerant supplementing circuit, and the plurality of switch units further comprises a sixth switch unit. The second refrigerant supplementing circuit is arranged between the second port of the supercooler and the refrigerant supplementing port of the gas-liquid separator. The sixth switch unit is arranged on the second refrigerant supplementing circuit.

8. The multi-split air conditioning unit of claim 5, wherein, The phase change material selected by the first phase change module is erythritol, the phase change material selected by the second phase change module is modified paraffin, and the phase change material selected by the third phase change module is calcium chloride hexahydrate solution.

9. The multi-split air conditioning unit according to claim 8, wherein, The phase change temperature of the first phase change module is 50-70 DEG C, the phase change temperature of the second phase change module is 20-50 DEG C, and the phase change temperature of the third phase change module is -20-20 DEG C.

10. A control method of a multi-split air conditioning unit, characterized by, The method is applied to the multi-split air conditioning unit of any one of claims 1-9, and the method comprises: obtaining an outdoor environment temperature and a refrigerant supplementing temperature; controlling the working states of the first phase change module and the second phase change module according to the outdoor environment temperature and the refrigerant supplementing temperature.

11. The control method of a multi-split air conditioning unit according to claim 10, wherein, The controlling the working states of the first phase change module and the second phase change module according to the outdoor environment temperature and the refrigerant supplementing temperature comprises: in the case that the outdoor environment temperature is less than a first preset temperature and the refrigerant supplementing temperature is less than a second preset temperature, starting the first phase change module to exchange heat between the refrigerant in the indoor heat exchange branch and the refrigerant on the first refrigerant supplementing circuit; and / or in the case that the outdoor environment temperature is less than the first preset temperature and the refrigerant supplementing temperature is greater than a third preset temperature, starting the first phase change module to exchange heat between the refrigerant in the indoor heat exchange branch and the refrigerant on the first refrigerant supplementing circuit, and starting the second phase change module to absorb heat from the refrigerant on the first refrigerant supplementing circuit, wherein the third preset temperature is greater than the second preset temperature; and / or in the case that the outdoor environment temperature is greater than or equal to the first preset temperature, starting the first phase change module to absorb heat from the refrigerant in the indoor heat exchange branch, and starting the second phase change module to absorb heat from the refrigerant in the first refrigerant supplementing circuit.

12. The control method of a multi-split air conditioning unit according to claim 10, wherein, The method further comprises: obtaining a working mode of the multi-split air conditioning unit; controlling the working state of the third phase change module according to the working mode of the multi-split air conditioning unit.

13. The control method of a multi-split air conditioning unit according to claim 12, wherein, The controlling the working state of the third phase change module according to the working mode of the multi-split air conditioning unit comprises: In a case where the working mode of the multi-split air conditioning unit is a heating mode, the third phase change module is started to absorb heat from the refrigerant after heat exchange in the indoor heat exchange branch; and / or, In a case where the working mode of the multi-split air conditioning unit is a defrosting mode, the third phase change module is started to release heat from the refrigerant after heat exchange in the outdoor heat exchange branch; and / or, In a case where the working mode of the multi-split air conditioning unit is a refrigerating mode, the third phase change module is started to absorb heat from the refrigerant after heat exchange in the outdoor heat exchange branch.

14. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by a processor to implement the control method of the multi-split air conditioning unit according to any one of claims 10-13. The computer program is executed by a processor to implement the control method of the multi-split air conditioning unit according to any one of claims 10-13.

Images