Two-pipe heat recovery type air conditioning system

Abstract

The invention relates to the technical field of air conditioners, and discloses a two-pipe heat recovery type air conditioning system which comprises an air conditioning unit, a first circulation loop, a second circulation loop and a circulation water pump. The air conditioner unit comprises an outdoor heat exchanger, at least one first indoor heat exchanger and at least one second indoor heat exchanger, and the first indoor heat exchangers and the second indoor heat exchangers are arranged in different areas. A first throttling device is arranged on one side of a first medium channel of the first indoor heat exchanger, and a second throttling device is arranged on one side of a first medium channel of the second indoor heat exchanger, so that multiple functional modes are achieved by controlling the states of the circulating water pump, the first throttling device and the second throttling device. Therefore, the air conditioning system which is simple in structure and small in control difficulty can meet the cooling or heating requirements of different areas.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, for example, to a two-pipe heat recovery air conditioning system. Background Art

[0002] With the acceleration of my country's urbanization process, large public buildings have gradually become a symbol of urbanization. Their rapid development has led to an increasing demand and scope of use for HVAC systems. In actual public buildings, the heating and cooling needs of different areas are often different: the heating and cooling needs of the outer area are often related to the outdoor meteorological conditions, while the inner area is often dominated by cooling needs. Therefore, it is shown that: in summer, both the inner and outer areas of the building have cooling needs; in winter, the outer area of ​​the building needs heating, while the inner area needs cooling; in the transition season, cooling or heating should be carried out according to the outdoor meteorological conditions and the actual needs of the inner and outer areas.

[0003] The related technology discloses a two-pipe heat recovery multi-split system, and the air conditioner outdoor unit includes: a main circulation flow path and a jet reheat flow path. The main circulation flow path includes a jet reheat compressor, a reversing device and an outdoor heat exchanger connected by pipelines, and its two ends are respectively connected to the inlet and outlet of the refrigerant distribution device through the refrigerant output pipe and the refrigerant input pipe; the jet reheat flow path includes a flash evaporator and an outdoor throttling device, the inlet of the flash evaporator is connected to the refrigerant input pipe through the first pipeline, the gas side outlet is connected to the jet port of the jet reheat compressor through the second pipeline, and the liquid side outlet is connected to the input end of the outdoor heat exchanger through the third pipeline, and the outdoor throttling device is arranged on the third pipeline. Thereby meeting the heating and cooling needs of different areas.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] The system has multiple refrigerant pipelines and requires a high refrigerant charge. The system has a complex structure, too many switching valves, and is difficult to control. In addition, when switching, for example, from heating mode to cooling mode, the system needs to fill the hot water pipeline with cold water, resulting in energy mixing and reduced energy efficiency. Summary of the invention

[0006] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0007] The disclosed embodiment provides a two-pipe heat recovery air conditioning system to solve the problem of how to meet the cooling or heating needs of different areas through a set of air conditioning system with simple structure and low control difficulty.

[0008] In some embodiments, the two-pipe heat recovery air conditioning system comprises:

[0009] An air conditioning unit, comprising an outdoor heat exchanger, at least one first indoor heat exchanger, and at least one second indoor heat exchanger, wherein the first indoor heat exchanger and the second indoor heat exchanger are arranged in different areas; and the first indoor heat exchanger is a two-medium heat exchanger, and the second indoor heat exchanger and the outdoor heat exchanger are three-medium heat exchangers;

[0010] a first circulation loop, wherein the first medium channel of the outdoor heat exchanger, the first medium channel of the first indoor heat exchanger, and the first medium channel of the second indoor heat exchanger are connected to the first circulation loop; and the first medium channel of the first indoor heat exchanger and the first medium channel of the second indoor heat exchanger are in parallel, and the first medium channel of the outdoor heat exchanger and the first medium channel of the first indoor heat exchanger are in series;

[0011] a second circulation loop, wherein the second medium channel of the outdoor heat exchanger and the second medium channel of the second indoor heat exchanger are connected in series and communicated with the second circulation loop; and the second circulation loop is provided with a first regulating valve, and the first regulating valve is used to regulate the flow of the second circulation loop;

[0012] A circulating water pump, arranged in the second circulating loop;

[0013] Among them, a first throttling device is provided on one side of the first medium channel of the first indoor heat exchanger, and a second throttling device is provided on one side of the first medium channel of the second indoor heat exchanger, so that multiple functional modes can be realized by controlling the states of the circulating water pump, the first throttling device and the second throttling device.

[0014] Optionally, the third medium channel of the outdoor heat exchanger is a first air channel, and the air is made to flow through the first air channel by an outdoor fan to exchange heat with the first medium channel of the outdoor heat exchanger and / or the second medium channel of the outdoor heat exchanger;

[0015] Another medium channel of the first indoor heat exchanger is a second air channel, and the first indoor fan allows air to flow through the second air channel to exchange heat with the first medium channel of the first indoor heat exchanger;

[0016] The third medium channel of the second indoor heat exchanger is a third air channel, and the air is made to flow through the third air channel by the second indoor fan to exchange heat with the first medium channel of the second indoor heat exchanger and / or the second medium channel of the second indoor heat exchanger.

[0017] Optionally, the air conditioning unit further comprises:

[0018] A third indoor heat exchanger, which is a dual-medium heat exchanger; a first medium channel of the third indoor heat exchanger is connected to the second circulation loop and is in parallel with a second medium channel of the second indoor heat exchanger;

[0019] Another medium channel of the third indoor heat exchanger is a fourth air channel. A third indoor fan is provided on one side of the third indoor heat exchanger. The indoor air passes through the fourth air channel to exchange heat with the first medium channel of the third indoor heat exchanger to form hot air or cold air.

[0020] A second regulating valve is provided on the inlet side of the first medium channel of the third indoor heat exchanger.

[0021] Optionally, the second circulation loop is further provided with:

[0022] a safety valve, used to conduct to release pressure when the pressure of the second circulation loop is greater than a set pressure value; and / or,

[0023] A filter for filtering out impurities from the circulating medium flowing through the second circulation loop; and / or,

[0024] An expansion tank is used to provide a variable capacity space for the volume change caused by the change in temperature of the circulating medium in the second circulation loop; and / or,

[0025] The buffer tank is used to store part of the circulating medium of the second circulation loop and provide a variable capacity space for the volume change caused by the change of the circulating medium temperature.

[0026] Optionally, the circulating medium in the first circulation loop includes a refrigerant; and / or,

[0027] The circulating medium in the second circulation loop includes water or antifreeze liquid.

[0028] Optionally, the air-conditioning system has a full-area heating mode, and the full-area heating mode corresponds to the first circulation loop running a heating cycle, the first throttling device and the second throttling device are both turned on, and the circulating water pump is turned off.

[0029] Optionally, the air-conditioning system has a full-area cooling mode, and the full-area cooling mode corresponds to the first circulation loop running a refrigeration cycle, the first throttling device and the second throttling device are both turned on, and the circulating water pump is turned off.

[0030] Optionally, the air-conditioning system has a first zoned cooling / heating mode, and the first zoned cooling / heating mode corresponds to the first circulation loop running a refrigeration cycle, the first throttling device is turned on, the second throttling device is closed, and the circulating water pump is turned on, thereby supplying cooling through the first indoor heat exchanger and supplying heating through the second indoor heat exchanger.

[0031] Optionally, the air-conditioning system has a second zoned cooling / heating mode, and the second zoned cooling / heating mode corresponds to the first circulation loop running a heating cycle, the first throttling device is turned on, the second throttling device is closed, and the circulating water pump is turned on, thereby providing heating through the first indoor heat exchanger and providing cooling through the second indoor heat exchanger.

[0032] Optionally, the circulating medium in the first circulation loop (200) includes a refrigerant; and / or,

[0033] The circulating medium in the second circulation loop (300) includes water or antifreeze liquid.

[0034] The two-pipe heat recovery air conditioning system provided by the embodiment of the present disclosure can achieve the following technical effects:

[0035] By controlling the states of the circulating water pump, the first throttling device and the second throttling device, multiple functional modes can be realized to meet the cooling or heating needs of different areas at the same time. The air conditioning system has a simple structure, a small amount of refrigerant, fewer valves, and low control difficulty. It has high energy efficiency and requires low energy quality during operation. In addition, energy mixing will not occur when switching between multiple modes, which effectively improves the energy efficiency of the system.

[0036] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0038] Figure 1 is a structural schematic diagram of a two-pipe heat recovery air conditioning system provided by an embodiment of the present disclosure;

[0039] Figure 2 is a schematic diagram of a full-area heating mode provided by an embodiment of the present disclosure;

[0040] Figure 3 is a schematic diagram of a full-area cooling mode provided by an embodiment of the present disclosure;

[0041] Figure 4 is a schematic diagram of a first zone cooling / heating mode provided by an embodiment of the present disclosure;

[0042] Figure 5 is a schematic diagram of a second zone cooling / heating mode provided by an embodiment of the present disclosure;

[0043] Figure 6 It is a schematic diagram of multiple third indoor heat exchangers connected in parallel according to an embodiment of the present disclosure.

[0044] Reference numerals:

[0045] 1: compressor; 2: four-way reversing valve; 3: first indoor heat exchanger; 30: first throttling device; 4: second indoor heat exchanger; 40: second throttling device; 5: outdoor heat exchanger; 6: circulating water pump; 7: first regulating valve; 8: third indoor heat exchanger; 9: second regulating valve; 101: first medium channel; 102: second medium channel; 103: first air channel; 104: second air channel; 105: third air channel; 106: fourth air channel; 200: first circulation loop; 300: second circulation loop. DETAILED DESCRIPTION

[0046] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0047] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so as to describe the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0048] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0049] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0050] Unless otherwise stated, the term "plurality" means two or more.

[0051] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0052] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0053] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0054] Combination Figure 1-6 As shown, the embodiment of the present disclosure provides a two-pipe heat recovery type air conditioning system, including an air conditioning unit, a first circulation loop 200, a second circulation loop 300 and a circulating water pump 6. The air conditioning unit includes an outdoor heat exchanger 5, at least one first indoor heat exchanger 3, and at least one second indoor heat exchanger 4, and the first indoor heat exchanger 3 and the second indoor heat exchanger 4 are arranged in different areas; and the first indoor heat exchanger 3 is a dual-medium heat exchanger, and the second indoor heat exchanger 4 and the outdoor heat exchanger 5 are three-medium heat exchangers; the first medium channel 101 of the outdoor heat exchanger 5, the first medium channel 101 of the first indoor heat exchanger 3, and the first medium channel 101 of the second indoor heat exchanger 4 are connected to the first circulation loop 200; and the first medium channel 101 of the first indoor heat exchanger 3 and the first medium channel 101 of the second indoor heat exchanger 4 are connected in parallel. The system comprises: a first medium channel 101 of the outdoor heat exchanger 5 is connected in series with the first medium channel 101 of the first indoor heat exchanger 3; a second medium channel 102 of the outdoor heat exchanger 5 is connected in series with the second medium channel 102 of the second indoor heat exchanger 4 and is connected to the second circulation loop 300; a circulating water pump 6 is arranged in the second circulation loop 300; wherein, a first throttling device 30 is provided on one side of the first medium channel 101 of the first indoor heat exchanger 3, and a second throttling device 40 is provided on one side of the first medium channel 101 of the second indoor heat exchanger 4, thereby realizing a plurality of functional modes by controlling the states of the circulating water pump 6, the first throttling device 30 and the second throttling device 40.

[0055] The two-pipe heat recovery air conditioning system provided by the embodiment of the present disclosure realizes multiple functional modes by controlling the states of the circulating water pump 6, the first throttling device 30 and the second throttling device 40, and satisfies the cooling or heating needs of different areas at the same time. In addition, the two-pipe heat recovery air conditioning system has a simple structure, a small refrigerant charge, fewer valves, and low control difficulty, high energy efficiency, and low energy quality required for its operation. In addition, no energy mixing occurs when switching between multiple modes, which effectively improves the energy efficiency of the system.

[0056] Alternatively, if Figure 1 As shown, the third medium channel of the outdoor heat exchanger 5 is the first air channel 103, and the air is made to flow through the first air channel 103 through the outdoor fan to exchange heat with the first medium channel 101 of the outdoor heat exchanger 5 and / or the second medium channel 102 of the outdoor heat exchanger 5; another medium channel of the first indoor heat exchanger 3 is the second air channel 104, and the air is made to flow through the second air channel 104 through the first indoor fan to exchange heat with the first medium channel 101 of the first indoor heat exchanger 3; the third medium channel of the second indoor heat exchanger 4 is the third air channel 105, and the air is made to flow through the third air channel 105 through the second indoor fan to exchange heat with the first medium channel 101 of the second indoor heat exchanger 4 and / or the second medium channel 102 of the second indoor heat exchanger 4.

[0057] In this embodiment, when the outdoor fan is started, the outdoor air flows through the first air channel 103, thereby exchanging heat with the first medium channel 101 and / or the second medium channel 102 of the outdoor heat exchanger 5. When the first indoor fan is started, the air in the area where the first indoor heat exchanger 3 is located flows through the second air channel 104, thereby exchanging heat with the first medium channel 101 of the first indoor heat exchanger 3. When the second indoor fan is started, the air in the area where the second indoor heat exchanger 4 is located flows through the third air channel 105, thereby exchanging heat with the first medium channel 101 and / or the second medium channel 102 of the second indoor heat exchanger 4.

[0058] Optionally, the circulating medium in the first circulation loop 200 includes a refrigerant. In the two-pipe heat recovery type air conditioning system provided in the embodiment of the present disclosure, a compressor 1 and a four-way reversing valve 2 are also provided in the first circulation loop 200. The compressor 1 is used to drive the flow of the refrigerant in the first circulation loop 200, and the four-way reversing valve 2 is used to switch the flow direction of the refrigerant in the first circulation loop 200 so as to realize the first circulation loop 200 to run a heating cycle or a refrigeration cycle. The first throttling device 30 and the second throttling device 40 are both expansion valves, and the expansion valve is used to throttle and reduce the pressure of the refrigerant. Among them, when the first circulation loop 200 runs a heating cycle, the flow direction of its refrigerant is the compressor 1, the four-way reversing valve 2, the first indoor heat exchanger 3 and the second indoor heat exchanger 4, the outdoor heat exchanger 5 and the compressor 1. When the first circulation loop 200 runs a refrigeration cycle, the flow direction of its refrigerant is the compressor 1, the four-way reversing valve 2, the outdoor heat exchanger 5, the first indoor heat exchanger 3 and the second indoor heat exchanger 4, and the compressor 1.

[0059] Optionally, the first circulation loop 200 is further provided with an oil separator, and / or a gas-liquid separator, and / or a recooler.

[0060] Exemplarily, in a two-pipe heat recovery air conditioning system, a compressor 1, a four-way reversing valve 2, an outdoor heat exchanger 5, a first indoor heat exchanger 3, a second indoor heat exchanger 4, an oil separator, a gas-liquid separator and a subcooler are used to form a first circulation loop 200.

[0061] Optionally, the circulating medium in the second circulation loop 300 includes water or antifreeze. Water and antifreeze have excellent cooling capacity.

[0062] In this embodiment, the second medium circulates in the loop 300, and when it flows through the outdoor heat exchanger 5, after the circulating water pump 6 is turned on, the water or antifreeze exchanges heat with the first medium channel 101 of the outdoor heat exchanger 5 in the second medium channel 102; the water or antifreeze flow carries the heat or cold obtained from the outdoor heat exchanger 5 into the second medium channel 102 of the second indoor heat exchanger 4, and at this time, the corresponding area of ​​the second indoor heat exchanger 4 can be heated or cooled.

[0063] Optionally, a safety valve is further provided on the second circulation loop 300, which is used to be turned on to relieve pressure when the pressure in the second circulation loop 300 is greater than a set pressure value; and / or, a filter is further provided, which is used to filter out impurities from the circulating medium flowing through the second circulation loop 300; and / or, an expansion tank is further provided, which is used to provide a variable capacity space for the volume change caused by the change in the hot and cold temperatures of the circulating medium in the second circulation loop 300; and / or, a buffer tank is further provided, which is used to store part of the circulating medium in the second circulation loop 300 and provide a variable capacity space for the volume change caused by the change in the hot and cold temperatures of the circulating medium.

[0064] Exemplarily, in a two-pipe heat recovery air conditioning system, the second medium channel 102 of the outdoor heat exchanger 5, the second medium channel 102 of the second indoor heat exchanger 4, the circulating water pump 6, the safety valve, the filter, the expansion tank and the buffer tank together constitute the second circulation loop 300.

[0065] Optionally, the second circulation loop 300 is provided with a first regulating valve 7 , and the first regulating valve 7 is used to regulate the flow of the second circulation loop 300 .

[0066] In this embodiment, when the circulating water pump 6 is turned on, the flow of the second circulation loop 300 can be adjusted by controlling the opening of the first regulating valve 7, thereby controlling the heating or cooling capacity of the second medium channel 102 of the second indoor heat exchanger 4.

[0067] Alternatively, if Figure 2 As shown, the two-pipe heat recovery air conditioning system has a full-area heating mode. The full-area heating mode corresponds to the first circulation loop 200 running a heating cycle, the first throttling device 30 and the second throttling device 40 are both turned on, and the circulating water pump 6 is turned off.

[0068] In this embodiment, when the areas corresponding to the first indoor heat exchanger 3 and the second indoor heat exchanger 4 both have heating demand, the two-pipe heat recovery air conditioning system operates in the full-area heating mode. In the full-area heating mode, the second circulation loop 300 is in a blocked state, the first circulation loop 200 operates a heating cycle, and the first medium channel 101 of the first indoor heat exchanger 3 and the first medium channel 101 of the second indoor heat exchanger 4 are filled with high-temperature refrigerant. The first indoor fan and the second indoor fan are both started to supply hot air to the corresponding areas.

[0069] Alternatively, if Figure 3 As shown, the two-pipe heat recovery air conditioning system has a full-area cooling mode. The full-area cooling mode corresponds to the first circulation loop 200 running a refrigeration cycle, the first throttling device 30 and the second throttling device 40 are both turned on, and the circulating water pump 6 is turned off.

[0070] In this embodiment, when the areas corresponding to the first indoor heat exchanger 3 and the second indoor heat exchanger 4 both have cooling demand, the two-pipe heat recovery type air conditioning system operates in the full-area cooling mode. In the full-area cooling mode, the second circulation loop 300 is in a blocked state, the first circulation loop 200 operates a refrigeration cycle, and the first medium channel 101 of the first indoor heat exchanger 3 and the first medium channel 101 of the second indoor heat exchanger 4 are filled with low-temperature refrigerant. The first indoor fan and the second indoor fan are both started to supply cold air to the corresponding areas.

[0071] Alternatively, if Figure 4As shown, the two-pipe heat recovery air-conditioning system has a first zone cooling / heating mode, and the first zone cooling / heating mode corresponds to the first circulation loop 200 running a refrigeration cycle, the first throttling device 30 is turned on, the second throttling device 40 is closed, and the circulating water pump 6 is turned on, thereby providing cooling through the first indoor heat exchanger 3 and providing heating through the second indoor heat exchanger 4.

[0072] In this embodiment, when the area corresponding to the first indoor heat exchanger 3 has a cooling demand and the area corresponding to the second indoor heat exchanger 4 has a heating demand, the two-pipe heat recovery type air conditioning system operates the first zone cooling / heating mode. In the first zone cooling / heating mode, the second circulation loop 300 is in a circulation state, the first circulation loop 200 operates a refrigeration cycle, and the first medium channel 101 of the second indoor heat exchanger 4 is blocked. The first medium channel 101 of the outdoor heat exchanger 5 contains a high-temperature refrigerant, and the first medium channel 101 of the first indoor heat exchanger 3 contains a low-temperature refrigerant. The water or antifreeze in the second medium channel 102 of the outdoor heat exchanger 5 exchanges heat with the high-temperature refrigerant. When the water or antifreeze flows through the second medium channel 102 of the second indoor heat exchanger 4, under the action of the second indoor fan, the air passes through the third air channel 105 and exchanges heat with the second medium channel 102 of the second indoor heat exchanger 4, thereby supplying hot air to the corresponding area. At the same time, under the action of the first indoor fan, the air passes through the second air channel 104 to exchange heat with the first medium channel 101 of the first indoor heat exchanger 3, thereby supplying cold air to the corresponding area. The outdoor fan is turned on or off according to the heat balance of the system. For example, if the heat at the first medium channel 101 of the outdoor heat exchanger 5 is less, the outdoor fan is turned off, which effectively reduces the heat exchange between the outdoor air and the first medium channel 101 and the second medium channel 102 of the outdoor heat exchanger 5, and ensures the heat exchange between the first medium channel 101 and the second medium channel 102 of the outdoor heat exchanger 5. If the heat at the first medium channel 101 of the outdoor heat exchanger 5 is more, the outdoor fan is turned on to achieve energy balance in the system and ensure the heat exchange effect of the second indoor heat exchanger 4.

[0073] Alternatively, if Figure 5 As shown, the two-pipe heat recovery air-conditioning system has a second zone cooling / heating mode, and the second zone cooling / heating mode corresponds to the first circulation loop 200 running a heating cycle, the first throttling device 30 is turned on, the second throttling device 40 is closed, and the circulating water pump 6 is turned on, thereby providing heat through the first indoor heat exchanger 3 and providing cooling through the second indoor heat exchanger 4.

[0074] In this embodiment, when the area corresponding to the first indoor heat exchanger 3 has a heating demand and the area corresponding to the second indoor heat exchanger 4 has a cooling demand, the two-pipe heat recovery type air conditioning system operates the second zone cooling / heating mode. In the second zone cooling / heating mode, the second circulation loop 300 is in a circulation state, the first circulation loop 200 operates a heating cycle, and the first medium channel 101 of the second indoor heat exchanger 4 is blocked. The first medium channel 101 of the outdoor heat exchanger 5 contains a low-temperature refrigerant, and the first medium channel 101 of the first indoor heat exchanger 3 contains a high-temperature refrigerant. The water or antifreeze in the second medium channel 102 of the outdoor heat exchanger 5 exchanges heat with the low-temperature refrigerant. When the water or antifreeze flows through the second medium channel 102 of the second indoor heat exchanger 4, under the action of the second indoor fan, the air passes through the third air channel 105 and exchanges heat with the second medium channel 102 of the second indoor heat exchanger 4, thereby supplying cold air to the corresponding area. At the same time, under the action of the first indoor fan, the air exchanges heat with the first medium channel 101 of the first indoor heat exchanger 3 through the second air channel 104, thereby supplying warm air to the corresponding area.

[0075] Alternatively, if Figure 6 As shown, the second circulation loop 300 is also provided with a third indoor heat exchanger 8. The third indoor heat exchanger 8 is a dual-medium heat exchanger, and its first medium channel 101 is connected to the second circulation loop 300 and is in parallel with the second medium channel 102 of the second indoor heat exchanger 4. Another medium channel of the third indoor heat exchanger 8 is a fourth air channel 106, and a third indoor fan is provided on one side of the third indoor heat exchanger 8. Under the action of the third indoor fan, the indoor air passes through the fourth air channel 106 and exchanges heat with the first medium channel 101 of the third indoor heat exchanger 8 to form hot air or cold air. A second regulating valve 9 is provided on the inflow side of the first medium channel 101 of the third indoor heat exchanger 8, and the flow rate of the circulating medium in the second circulation loop 300 in the first medium channel 101 of the third indoor heat exchanger 8 is adjusted by the second regulating valve 9.

[0076] In this embodiment, the second indoor heat exchanger 4 and the third indoor heat exchanger 8 are arranged in the same or different areas. (1) When the two-pipe heat recovery air conditioning system operates in the first zone cooling / heating mode, the second indoor heat exchanger 4 and the third indoor heat exchanger 8 are used to heat the corresponding areas respectively, and the heating needs of different areas are met by adjusting the opening of the first regulating valve 7 and the second regulating valve 9 or the air volume of the second indoor fan and the third indoor fan. When the two-pipe heat recovery air conditioning system operates in the second zone cooling / heating mode, the second indoor heat exchanger 4 and the third indoor heat exchanger 8 are used to cool the corresponding areas respectively, and the cooling needs of different areas are met by adjusting the opening of the first regulating valve 7 and the second regulating valve 9 or the air volume of the second indoor fan and the third indoor fan.

[0077] (2) When the two-pipe heat recovery air conditioning system operates in the full-area heating / cooling mode, the third indoor heat exchanger 8 supplies cooling / heating to the corresponding areas respectively, and the cooling / heating demand of the corresponding areas is met by adjusting the opening of the second regulating valve 9 or the air volume of the third indoor fan. In the full-area heating / cooling mode, the difference from the above embodiment is that the second circulation loop 300 is in a circulation state. The water or antifreeze in the second medium channel 102 of the outdoor heat exchanger 5 exchanges heat with the low-temperature / high-temperature refrigerant. When the water or antifreeze flows through the first medium channel 101 of the third indoor heat exchanger 8, under the action of the third indoor fan, the air passes through the fourth air channel 106 and exchanges heat with the first medium channel 101 of the third indoor heat exchanger 8, thereby supplying cooling / hot air to the corresponding areas.

[0078] (3) When the two-pipe heat recovery air conditioning system operates in the full-area heating / cooling mode, the third indoor heat exchanger 8 provides heating / cooling to the corresponding area respectively, and the heating / cooling demand of the corresponding area is met by adjusting the opening of the second regulating valve 9 or the air volume of the third indoor fan. In the full-area heating / cooling mode, the difference from the above embodiment is that the second circulation loop 300 is in a circulation state. Under the action of the heat pump cycle, when the generated heat passes through the first medium channel 101 of the second indoor heat exchanger 4, on the one hand, under the action of the fan, it is transferred to the air in the third air heat exchange channel 105 to form hot air to provide heating / cooling demand for the indoor room. On the other hand, the water or antifreeze in the second medium channel 102 of the second indoor heat exchanger 4 exchanges heat with the high-temperature / low-temperature refrigerant in the first medium channel 101. When the water or antifreeze flows through the first medium channel 101 of the third indoor heat exchanger 8, under the action of the third indoor fan, the air passes through the fourth air channel 106 and exchanges heat with the first medium channel 101 of the third indoor heat exchanger 8, thereby providing heating / cooling air to the corresponding area.

[0079] Optionally, when the two-pipe heat recovery air conditioning system has a plurality of first indoor heat exchangers 3 , the first medium channels 101 of the plurality of first indoor heat exchangers 3 are connected in parallel and communicated with the first circulation loop 200 .

[0080] Optionally, in the case of multiple second indoor heat exchangers 4, the second medium channels 102 of the multiple second indoor heat exchangers 4 are connected in parallel and connected to the second circulation loop 300. A first regulating valve 7 is provided on the inflow side of the second medium channel 102 of each second indoor heat exchanger 4, so that the heating or cooling capacity of the corresponding second indoor heat exchanger 4 is adjusted by controlling the opening of each first regulating valve 7 or the air volume of the second indoor fan. In this way, the two-pipe heat recovery air conditioning system can effectively adjust the cooling or heating capacity of different areas while meeting the cooling or heating needs of different areas.

[0081] Exemplarily, the two-pipe heat recovery air conditioning system has two first indoor heat exchangers 3 and two second indoor heat exchangers 4, wherein the two first indoor heat exchangers 3 are respectively located in area one and area two, and the two second indoor heat exchangers 4 are respectively located in area three and area four. When area one and area two have cooling demand, area three has low-speed heating demand, and area four has fast heating demand, the two-pipe heat recovery air conditioning system operates the first zone cooling / heating mode. At this time, the two first indoor heat exchangers 3 supply cold air to the corresponding areas one and two, respectively, and the two second indoor heat exchangers 4 supply warm air to the corresponding areas three and four, respectively. In addition, the opening of the first regulating valve 7 corresponding to the second indoor heat exchanger 4 in area three is adjusted to 1 / 4, and the opening of the first regulating valve 7 corresponding to the second indoor heat exchanger 4 in area four is adjusted to fully open. In this way, the flow rate of water or refrigerant in the second medium channel 102 of the second indoor heat exchanger 4 in area three is small, which meets the low-speed heating demand of area three; the flow rate of water or refrigerant in the second medium channel 102 of the second indoor heat exchanger 4 in area four is large, which meets the rapid heating demand of area three.

[0082] In another exemplary embodiment, the two-pipe heat recovery air conditioning system has two first indoor heat exchangers 3 and two second indoor heat exchangers 4, wherein the two first indoor heat exchangers 3 are respectively located in area one and area two, and the two second indoor heat exchangers 4 are respectively located in area three and area four. When area one and area two have heating demand, area three has low-speed cooling demand, and area four has fast cooling demand, the two-pipe heat recovery air conditioning system operates the second zone cooling / heating mode. At this time, the two first indoor heat exchangers 3 respectively supply heating air to the corresponding areas one and two, and the two second indoor heat exchangers 4 respectively supply cooling air to the corresponding areas three and four. In addition, the power of the first fan corresponding to the second indoor heat exchanger 4 in area three is adjusted to 1 / 4, and the power of the first fan corresponding to the second indoor heat exchanger 4 in area four is adjusted to the maximum. In this way, the air volume of the third air channel 105 of the second indoor heat exchanger 4 in area three is small, which meets the low-speed cooling demand of area three; the air volume of the third air channel 105 of the second indoor heat exchanger 4 in area four is large, which meets the fast cooling demand of area three.

[0083] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A two-pipe heat recovery air conditioning system, characterized in that: include: An air conditioning unit comprises an outdoor heat exchanger (5), at least one first indoor heat exchanger (3), and at least one second indoor heat exchanger (4), wherein the first indoor heat exchanger (3) and the second indoor heat exchanger (4) are arranged in different areas; and the first indoor heat exchanger (3) is a two-medium heat exchanger, and the second indoor heat exchanger (4) and the outdoor heat exchanger (5) are three-medium heat exchangers; A first circulation loop (200), wherein the first medium channel (101) of the outdoor heat exchanger (5), the first medium channel (101) of the first indoor heat exchanger (3), and the first medium channel (101) of the second indoor heat exchanger (4) are connected to the first circulation loop (200); and the first medium channel (101) of the first indoor heat exchanger (3) and the first medium channel (101) of the second indoor heat exchanger (4) are in a parallel relationship, and the first medium channel (101) of the outdoor heat exchanger (5) and the first medium channel (101) of the first indoor heat exchanger (3) are in a series relationship; A second circulation loop (300), wherein the second medium channel (102) of the outdoor heat exchanger (5) and the second medium channel (102) of the second indoor heat exchanger (4) are connected in series and communicate with the second circulation loop (300); and the second circulation loop (300) is provided with a first regulating valve (7), and the first regulating valve (7) is used to regulate the flow of the second circulation loop (300); A circulating water pump (6), arranged in the second circulating loop (300); A first throttling device (30) is provided on one side of the first medium channel (101) of the first indoor heat exchanger (3), and a second throttling device (40) is provided on one side of the first medium channel (101) of the second indoor heat exchanger (4), so that a variety of functional modes can be realized by controlling the states of the circulating water pump (6), the first throttling device (30) and the second throttling device (40).

2. The two-pipe heat recovery air conditioning system according to claim 1, characterized in that: The third medium channel of the outdoor heat exchanger (5) is a first air channel (103), and air is caused to flow through the first air channel (103) by an outdoor fan to exchange heat with the first medium channel (101) of the outdoor heat exchanger (5) and / or the second medium channel (102) of the outdoor heat exchanger (5); Another medium channel of the first indoor heat exchanger (3) is a second air channel (104), and air is caused to flow through the second air channel (104) by the first indoor fan to exchange heat with the first medium channel (101) of the first indoor heat exchanger (3); The third medium channel of the second indoor heat exchanger (4) is a third air channel (105), and the air is caused to flow through the third air channel (105) by the second indoor fan to exchange heat with the first medium channel (101) of the second indoor heat exchanger (4) and / or the second medium channel (102) of the second indoor heat exchanger (4).

3. The two-pipe heat recovery air conditioning system according to claim 1 or 2, characterized in that: The air conditioning unit further comprises: A third indoor heat exchanger (8), which is a dual-medium heat exchanger; the first medium channel (101) of the third indoor heat exchanger (8) is connected to the second circulation loop (300), and is in parallel with the second medium channel (102) of the second indoor heat exchanger (4); Another medium channel of the third indoor heat exchanger (8) is a fourth air channel (106), and a third indoor fan is provided on one side of the third indoor heat exchanger (8). Indoor air passes through the fourth air channel (106) and exchanges heat with the first medium channel (101) of the third indoor heat exchanger (8) to form hot air or cold air; A second regulating valve (9) is provided on the inlet side of the first medium channel (101) of the third indoor heat exchanger (8).

4. The two-pipe heat recovery air conditioning system according to claim 1 or 2, characterized in that: The second circulation loop (300) is also provided with: a safety valve, used to open to release pressure when the pressure of the second circulation loop (300) is greater than a set pressure value; and / or, a filter for filtering out impurities from the circulating medium flowing through the second circulating loop (300); and / or, an expansion tank, for providing a variable capacity space for the volume change caused by the change in temperature of the circulating medium in the second circulation loop (300); and / or, The buffer tank is used to store part of the circulating medium of the second circulation loop (300) and to provide a variable capacity space for the volume change caused by the change of the circulating medium temperature.

5. The two-pipe heat recovery air conditioning system according to claim 1 or 2, characterized in that: The circulating medium in the first circulation loop (200) includes a refrigerant; and / or, The circulating medium in the second circulation loop (300) includes water or antifreeze liquid.

6. The two-pipe heat recovery air conditioning system according to claim 1 or 2, characterized in that: The air conditioning system has a full-area heating mode, and the full-area heating mode corresponds to the first circulation loop (200) running a heating cycle, the first throttling device (30) and the second throttling device (40) are both turned on, and the circulating water pump (6) is turned off.

7. The two-pipe heat recovery air conditioning system according to claim 1 or 2, characterized in that: The air conditioning system has a full-area cooling mode, and the full-area cooling mode corresponds to the first circulation loop (200) running a refrigeration cycle, the first throttling device (30) and the second throttling device (40) are both turned on, and the circulating water pump (6) is turned off.

8. The two-pipe heat recovery air conditioning system according to claim 1 or 2, characterized in that: The air conditioning system has a first zone cooling / heating mode, and the first zone cooling / heating mode corresponds to the first circulation loop (200) running a refrigeration cycle, the first throttling device (30) is turned on, the second throttling device (40) is closed, and the circulating water pump (6) is turned on, thereby providing cooling through the first indoor heat exchanger (3) and providing heating through the second indoor heat exchanger (4).

9. The two-pipe heat recovery air conditioning system according to claim 1 or 2, characterized in that: The air conditioning system has a second zone cooling / heating mode, and the second zone cooling / heating mode corresponds to the first circulation loop (200) running a heating cycle, the first throttling device (30) is turned on, the second throttling device (40) is turned off, and the circulating water pump (6) is turned on, so that heating is provided through the first indoor heat exchanger (3) and cooling is provided through the second indoor heat exchanger (4).

10. The two-pipe heat recovery air conditioning system according to claim 1 or 2, characterized in that: The circulating medium in the first circulation loop (200) includes a refrigerant; and / or, The circulating medium in the second circulation loop (300) includes water or antifreeze liquid.

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