CN220524225U - Two-pipe heat recovery type air conditioning system - Google Patents

Abstract

The application 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 circulating water pump. The air conditioning unit comprises 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; one side of the first medium channel of the first indoor heat exchanger is provided with a first throttling device, and one side of the first medium channel of the second indoor heat exchanger is provided with a second throttling device, so that various functional modes are realized by controlling states of the circulating water pump, the first throttling device and the second throttling device. Therefore, the air conditioning system with simple structure and small control difficulty can meet the cooling or heating requirements of different areas.

Description

Two-pipe heat recovery type air conditioning system

Technical Field

The application relates to the technical field of air conditioners, for example, to a two-pipe heat recovery type air conditioning system.

Background

With the acceleration of the urban process in China, large public buildings become urban marks gradually, and the rapid development of the large public buildings makes the demands and the application ranges of heating, ventilation and air conditioning systems increasingly larger. In practical public buildings, the cooling and heating requirements between different areas are not the same in many cases: the cooling and heating requirements of the outer zone are often related to outdoor weather conditions, while the inner zone is often dominated by cooling requirements. Thus, it appears that: in summer, the inner area and the outer area of the building are both required by cooling; in winter, the building outer zone needs heating, while the inner zone needs cooling; and in the transitional season, cooling or heating is performed according to the outdoor weather conditions and the actual requirements of the inner area and the outer area.

The related art discloses a two control heat recovery multi-split system, and the air condensing units includes: the main circulation flow path and the jet enthalpy increasing flow path. The main circulation flow path comprises an enhanced vapor injection compressor, a reversing device and an outdoor heat exchanger which are connected through pipelines, and two ends of the main circulation flow path are respectively communicated with an inlet and an outlet of the refrigerant distribution device through a refrigerant output pipe and a refrigerant input pipe; the vapor injection enthalpy-increasing flow path comprises a flash evaporator and an outdoor throttling device, wherein an inlet of the flash evaporator is communicated with a refrigerant input pipe through a first pipeline, a gas side outlet is connected with a gas injection port of the vapor injection enthalpy-increasing compressor through a second pipeline, a liquid side outlet is connected with an input end of the outdoor heat exchanger through a third pipeline, and the outdoor throttling device is arranged on the third pipeline. Thereby meeting the cooling and heating requirements of different areas.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

the system has multiple refrigerant lines, requiring a high refrigerant charge. The system has complex structure, too many switching valves and great control difficulty. And when the system is switched, for example, the heating mode is switched to the refrigeration mode, cold water needs to be filled in a hot water pipeline, so that the energy blending energy efficiency is reduced.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the disclosure provides a two-pipe heat recovery type air conditioning system, which aims at solving the problem of how to meet the cooling or heating requirements of different areas through a set of air conditioning system with simple structure and small control difficulty.

In some embodiments, the two-tube heat recovery air conditioning system comprises:

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

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 communicated with the first circulation loop; the first medium channel of the first indoor heat exchanger and the first medium channel of the second indoor heat exchanger are in parallel connection, and the first medium channel of the outdoor heat exchanger and the first medium channel of the first indoor heat exchanger are in series connection;

the second medium channel of the outdoor heat exchanger is connected in series with the second medium channel of the second indoor heat exchanger and is communicated with the second circulation loop; the second circulation loop is provided with a first regulating valve, and the first regulating valve is used for regulating the flow of the second circulation loop;

the circulating water pump is arranged in the second circulating loop;

the first throttling device is arranged on one side of the first medium channel of the first indoor heat exchanger, and the second throttling device is arranged on one side of the first medium channel of the second indoor heat exchanger, so that multiple functional modes are realized by controlling states of the circulating water pump, the first throttling device and the second throttling device.

Optionally, the third medium channel of the outdoor heat exchanger is a first air channel, and air flows through the first air channel through 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;

the other medium channel of the first indoor heat exchanger is a second air channel, and air flows through the second air channel through the first indoor fan to exchange heat with the first medium channel of the first indoor heat exchanger;

the third medium channel of the second indoor heat exchanger is a third air channel, and air flows through the third air channel through 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.

Optionally, the air conditioning unit further comprises:

the third indoor heat exchanger is a double-medium heat exchanger; the first medium channel of the third indoor heat exchanger is communicated with the second circulation loop and is in parallel connection with the second medium channel of the second indoor heat exchanger;

the other medium channel of the third indoor heat exchanger is a fourth air channel, one side of the third indoor heat exchanger is provided with a third indoor fan, and indoor air exchanges heat with the first medium channel of the third indoor heat exchanger through the fourth air channel to form hot air or cold air;

and a second regulating valve is arranged on the inflow side of the first medium channel of the third indoor heat exchanger.

Optionally, the second circulation loop is further provided with:

the safety valve is used for conducting to release pressure when the pressure of the second circulation loop is larger than a set pressure value; and/or the number of the groups of groups,

a filter for filtering out impurities from the circulating medium flowing through the second circulation loop; and/or the number of the groups of groups,

an expansion tank for providing a volume-variable space for volume variation generated by the change of cold and hot temperatures of the circulating medium in the second circulating loop; and/or the number of the groups of groups,

the buffer tank is used for storing part of the circulating medium of the second circulating loop and providing a volume-variable space for volume change caused by cold and hot temperature change of the circulating medium.

Optionally, the circulating medium in the first circulating loop comprises a refrigerant; and/or the number of the groups of groups,

the circulating medium in the second circulation loop comprises water or antifreeze.

Optionally, the air conditioning system has a full area heating mode, the full area heating mode corresponds to the first circulation loop running heating cycle, the first throttling device and the second throttling device are both opened, and the circulating water pump is closed.

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

Optionally, the air conditioning system has a first zone cooling/heating mode, the first zone cooling/heating mode corresponds to the first circulation loop running refrigeration cycle, the first throttling device is opened, the second throttling device is closed, and the circulating water pump is opened, so that cooling is performed by the first indoor heat exchanger and heating is performed by the second indoor heat exchanger.

Optionally, the air conditioning system has a second zone cooling/heating mode, the second zone cooling/heating mode corresponds to the first circulation loop running heating cycle, the first throttling device is opened, the second throttling device is closed, and the circulating water pump is opened, so that heat is supplied by the first indoor heat exchanger and cold is supplied by the second indoor heat exchanger.

Optionally, the circulating medium in the first circulating loop (200) comprises a refrigerant; and/or the number of the groups of groups,

the circulating medium in the second circulation loop (300) comprises water or antifreeze.

The two-pipe heat recovery type air conditioning system provided by the embodiment of the disclosure can realize the following technical effects:

the states of the circulating water pump, the first throttling device and the second throttling device are controlled to realize multiple functional modes, and meanwhile, the cooling or heating requirements of different areas are met. The air conditioning system has the advantages of simple structure, small refrigerant filling amount, less control difficulty of the valve, high energy efficiency and lower energy grade required by operation. In addition, energy blending can not occur when the modes are mutually switched, and the energy efficiency of the system is effectively improved.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:

FIG. 1 is a schematic diagram of a two-tube heat recovery air conditioning system according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a full zone heating mode provided by an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a full area cooling mode provided by an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a first zone cooling/warming mode provided by an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a second zone cooling/heating mode provided by an embodiment of the present disclosure;

fig. 6 is a schematic diagram of a plurality of third indoor heat exchangers provided in an embodiment of the present disclosure in parallel.

Reference numerals:

1: a compressor; 2: a four-way reversing valve; 3: a first indoor heat exchanger; 30: a first throttle device; 4: a second indoor heat exchanger; 40: a second throttle device; 5: an outdoor heat exchanger; 6: a circulating water pump; 7: a first regulating valve; 8: a third indoor heat exchanger; 9: a second regulating valve; 101: a first media channel; 102: a second media channel; 103: a first air passage; 104: a second air passage; 105: a third air passage; 106: a fourth air passage; 200: a first circulation loop; 300: a second circulation loop.

Detailed Description

So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe embodiments of the present disclosure and embodiments thereof and are not intended to limit the indicated device, element, or component to a particular orientation or to be constructed and operated in a particular orientation. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the embodiments of the present disclosure will be understood by those of ordinary skill in the art in view of the specific circumstances.

In addition, the terms "disposed," "connected," "secured" and "affixed" are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the embodiments of the present disclosure may be understood by those of ordinary skill in the art according to specific circumstances.

The term "plurality" means two or more, unless otherwise indicated.

In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

It should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other.

As shown in connection with fig. 1-6, embodiments of the present disclosure provide 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 circulation water pump 6. The 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, and the first indoor heat exchanger 3 and the second indoor heat exchanger 4 are arranged in different areas; the first indoor heat exchanger 3 is a double-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 communicated with the first circulation loop 200; 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 parallel connection, 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 series connection; 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 are communicated with the second circulation loop 300; the circulating water pump 6 is provided in the second circulation circuit 300; wherein, a first throttling device 30 is arranged at one side of the first medium channel 101 of the first indoor heat exchanger 3, and a second throttling device 40 is arranged at one side of the first medium channel 101 of the second indoor heat exchanger 4, thereby realizing multiple functional modes by controlling the states of the circulating water pump 6, the first throttling device 30 and the second throttling device 40.

By adopting the two-pipe heat recovery type air conditioning system provided by the embodiment of the disclosure, various functional modes are realized by controlling the states of the circulating water pump 6, the first throttling device 30 and the second throttling device 40, and meanwhile, the cooling or heating requirements of different areas are met. In addition, the two-pipe heat recovery type air conditioning system has the advantages of simple structure, small refrigerant filling amount, less control difficulty of the valve, high energy efficiency and lower energy grade required during operation. In addition, energy blending can not occur when the modes are mutually switched, and the energy efficiency of the system is effectively improved.

Optionally, as shown in fig. 1, the third medium channel of the outdoor heat exchanger 5 is a first air channel 103, and the air flows through the first air channel 103 by 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; the other medium channel of the first indoor heat exchanger 3 is a second air channel 104, and the air flows 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 a third air channel 105, and the second indoor fan causes air to flow through the third air channel 105 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.

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

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, the first circulation loop 200 is further provided with a compressor 1 and a four-way reversing valve 2. The compressor 1 is used for driving the refrigerant in the first circulation loop 200 to flow, and the four-way reversing valve 2 is used for switching the flow direction of the refrigerant in the first circulation loop 200 so as to realize the operation of the heating cycle or the refrigeration cycle of the first circulation loop 200. The first throttling device 30 and the second throttling device 40 are expansion valves, and the expansion valves are used for throttling and reducing the pressure of the refrigerant. When the first circulation loop 200 operates the heating cycle, the refrigerant flows to the compressor 1, the four-way reversing valve 2, the first indoor heat exchanger 3, the second indoor heat exchanger 4, the outdoor heat exchanger 5 and the compressor 1. When the first circulation loop 200 operates the refrigeration cycle, the refrigerant flows to the compressor 1, the four-way reversing valve 2, the outdoor heat exchanger 5, the first indoor heat exchanger 3, the second indoor heat exchanger 4 and the compressor 1.

Optionally, an oil separator, and/or a gas-liquid separator, and/or a sub-cooler are also provided on the first circulation loop 200.

Illustratively, the compressor 1, the four-way reversing valve 2, the outdoor heat exchanger 5, the first indoor heat exchanger 3, the second indoor heat exchanger 4, the oil separator, the gas-liquid separator and the sub-cooler are adopted to form a first circulation loop 200 in the two-pipe heat recovery type air conditioning system.

Optionally, the circulation medium within the second circulation loop 300 comprises water or antifreeze. The water and the antifreeze have excellent cold carrying capacity.

In the present embodiment, the loop 300 circulates, and when the second medium flowing through the outdoor heat exchanger 5 is turned on, the water or the antifreeze exchanges heat with the first medium passage 101 of the outdoor heat exchanger 5 at the time of the second medium passage 102; the water or antifreeze fluid carries the heat or cold obtained from the outdoor heat exchanger 5 into the second medium passage 102 of the second indoor heat exchanger 4, and heat or cold can be supplied to the corresponding area of the second indoor heat exchanger 4.

Optionally, a safety valve is further disposed on the second circulation loop 300, and the safety valve is used for conducting to perform pressure relief 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 circulation medium flowing through the second circulation loop 300 is further provided; and/or, an expansion tank is further provided for providing a variable volume space for volume changes generated by the change of the cold and hot temperatures of the circulating medium in the second circulation loop 300; and/or, a buffer tank is further provided for storing part of the circulating medium of the second circulation loop 300 and providing a variable volume space for volume changes generated by the change of the cold and hot temperatures of the circulating medium.

Illustratively, the second medium passage 102 of the outdoor heat exchanger 5, the second medium passage 102 of the second indoor heat exchanger 4, the circulating water pump 6, the relief valve, the filter, the expansion tank, and the buffer tank are employed together to constitute the second circulation loop 300 in the two-pipe heat recovery type air conditioning system.

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

In this embodiment, when the circulating water pump 6 is turned on, the opening of the first regulating valve 7 is controlled to regulate the flow rate of the second circulation circuit 300, so as to control the heat supply amount or the cold supply amount of the second medium passage 102 of the second indoor heat exchanger 4.

Alternatively, as shown in FIG. 2, the two-tube heat recovery type air conditioning system has a full zone heating mode. The full-area heating mode corresponds to the first circulation loop 200 operating the heating cycle, the first and second throttle devices 30 and 40 are both opened, and the circulation water pump 6 is closed.

In this embodiment, when the areas corresponding to the first indoor heat exchanger 3 and the second indoor heat exchanger 4 have heating requirements, the two-pipe heat recovery type air conditioning system operates in the full area heating mode. In the full-area heating mode, the second circulation loop 300 is in a blocking state, the first circulation loop 200 operates a heating cycle, and high-temperature refrigerants are arranged in 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. The first indoor fan and the second indoor fan are started, so that hot air is supplied to the corresponding areas.

Alternatively, as shown in FIG. 3, the two-tube heat recovery air conditioning system has a full area cooling mode. The full-area cooling mode corresponds to the first circulation loop 200 operating the refrigeration cycle, the first and second throttle devices 30 and 40 are both opened, and the circulation water pump 6 is closed.

In this embodiment, when the areas corresponding to the first indoor heat exchanger 3 and the second indoor heat exchanger 4 have cooling requirements, 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 blocking state, the first circulation loop 200 operates a refrigeration cycle, and low-temperature refrigerants are arranged in 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. The first indoor fan and the second indoor fan are started, so that cold air is supplied to the corresponding area.

Alternatively, as shown in fig. 4, the two-pipe heat recovery type air conditioning system has a first zone cooling/heating mode corresponding to the first circulation loop 200 running a refrigeration 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, thereby supplying heat through the first indoor heat exchanger 3 and the second indoor heat exchanger 4.

In this embodiment, when the area corresponding to the first indoor heat exchanger 3 has a cooling requirement and the area corresponding to the second indoor heat exchanger 4 has a heating requirement, the two-pipe heat recovery type air conditioning system operates in the first partition cooling/heating mode. In the first zone cooling/warming mode, the second circulation loop 300 is in a circulation state, the first circulation loop 200 operates the refrigeration cycle, and the first medium passage 101 of the second indoor heat exchanger 4 is blocked. The first medium channel 101 of the outdoor heat exchanger 5 is filled with a high-temperature refrigerant, and the first medium channel 101 of the first indoor heat exchanger 3 is filled with a low-temperature refrigerant. The water or the antifreeze and the high-temperature refrigerant in the second medium channel 102 of the outdoor heat exchanger 5 exchange heat, and when the water or the antifreeze flows through the second medium channel 102 of the second indoor heat exchanger 4, the air exchanges heat with the second medium channel 102 of the second indoor heat exchanger 4 through the third air channel 105 under the action of the second indoor fan, thereby supplying hot air to the corresponding area. Meanwhile, under the action of the first indoor fan, air exchanges heat with the first medium channel 101 of the first indoor heat exchanger 3 through the second air channel 104, 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 small, the outdoor fan is turned off, so that the heat exchange amount between the outdoor air and the first medium channel 101 and the second medium channel 102 of the outdoor heat exchanger 5 is effectively reduced, and the heat exchange amount between the first medium channel 101 and the second medium channel 102 of the outdoor heat exchanger 5 is ensured. If the heat quantity at the first medium channel 101 of the outdoor heat exchanger 5 is more, the outdoor fan is started, so that the energy balance in the system is realized, and the heat exchange effect of the second indoor heat exchanger 4 is ensured.

Alternatively, as shown in fig. 5, the two-pipe heat recovery type air conditioning system has a second zone cooling/heating mode corresponding to the first circulation loop 200 running a heating cycle, the first throttling device 30 being turned on, the second throttling device 40 being turned off, the circulating water pump 6 being turned on, thereby supplying heat through the first indoor heat exchanger 3, and cooling the second indoor heat exchanger 4.

In this embodiment, when the area corresponding to the first indoor heat exchanger 3 has a heating requirement and the area corresponding to the second indoor heat exchanger 4 has a cooling requirement, the two-pipe heat recovery type air conditioning system operates in the second partition cooling/heating mode. In the second zone cooling/warming mode, the second circulation loop 300 is in a circulation state, the first circulation loop 200 operates the heating cycle, and the first medium passage 101 of the second indoor heat exchanger 4 is blocked. The first medium channel 101 of the outdoor heat exchanger 5 is filled with a low-temperature refrigerant, and the first medium channel 101 of the first indoor heat exchanger 3 is filled with a high-temperature refrigerant. The water or the antifreeze fluid in the second medium channel 102 of the outdoor heat exchanger 5 exchanges heat with the low-temperature refrigerant, and when the water or the antifreeze fluid flows through the second medium channel 102 of the second indoor heat exchanger 4, the air exchanges heat with the second medium channel 102 of the second indoor heat exchanger 4 through the third air channel 105 under the action of the second indoor fan, thereby supplying cold air to the corresponding area. Meanwhile, under the action of the first indoor fan, air exchanges heat with the first medium channel 101 of the first indoor heat exchanger 3 through the second air channel 104, thereby heating air to the corresponding area.

Optionally, as shown in fig. 6, a third indoor heat exchanger 8 is further provided on the second circulation loop 300. The third indoor heat exchanger 8 is a dual medium heat exchanger, the first medium channel 101 of which is in communication with the second circulation loop 300 and in parallel relationship with the second medium channel 102 of the second indoor heat exchanger 4. The other medium channel of the third indoor heat exchanger 8 is a fourth air channel 106, and a third indoor fan is arranged on one side of the third indoor heat exchanger 8. Under the action of the third indoor fan, the indoor air exchanges heat with the first medium channel 101 of the third indoor heat exchanger 8 through the fourth air channel 106 to form hot air or cold air. The inflow side of the first medium passage 101 of the third indoor heat exchanger 8 is provided with a second regulating valve 9, and the flow rate of the circulating medium in the second circulation circuit 300 in the first medium passage 101 of the third indoor heat exchanger 8 is regulated by the second regulating valve 9.

In the present embodiment, the second indoor heat exchanger 4 and the third indoor heat exchanger 8 are disposed in the same or different areas. (1) When the two-pipe heat recovery type air conditioning system operates in the first partition cooling/heating mode, heat is supplied to corresponding areas through the second indoor heat exchanger 4 and the third indoor heat exchanger 8 respectively, and heat supply requirements of different areas are met by adjusting opening degrees of the first regulating valve 7 and the second regulating valve 9 or air volumes of the second indoor fan and the third indoor fan. When the two-pipe heat recovery type air conditioning system operates in the second partition cooling/heating mode, cooling is respectively supplied to the corresponding areas through the second indoor heat exchanger 4 and the third indoor heat exchanger 8, and cooling requirements of different areas are met by adjusting the opening degrees of the first regulating valve 7 and the second regulating valve 9 or the air volumes of the second indoor fan and the third indoor fan.

(2) When the two-pipe heat recovery type air conditioning system runs in the full-area heating/cooling mode, the third indoor heat exchanger 8 supplies cold/warm to the corresponding area respectively, and the opening degree of the second regulating valve 9 or the air quantity of the third indoor fan is regulated to meet the cold/heat supply requirement of the corresponding area. In the full zone heating/cooling mode, the difference from the above embodiment is that the second circulation loop 300 is in a circulation state. The water or the antifreeze fluid in the second medium channel 102 of the outdoor heat exchanger 5 exchanges heat with the low-temperature/high-temperature refrigerant, and when the water or the antifreeze fluid flows through the first medium channel 101 of the third indoor heat exchanger 8, under the action of the third indoor fan, the air exchanges heat with the first medium channel 101 of the third indoor heat exchanger 8 through the fourth air channel 106, so that cold/hot air is supplied to the corresponding area.

(3) When the two-pipe heat recovery type air conditioning system runs in the full-area heating/cooling mode, the third indoor heat exchanger 8 respectively heats/cools the corresponding area, and the opening degree of the second regulating valve 9 or the air quantity of the third indoor fan is regulated to meet the heating/cooling requirement of the corresponding area. In the full zone heating/cooling mode, the difference from the above embodiment is that the second circulation loop 300 is in a circulation state. When the produced heat passes through the first medium channel 101 of the second indoor heat exchanger 4 under the action of the heat pump cycle, on one hand, the produced heat is transferred to the air in the third air heat exchange channel 105 under the action of the fan to form hot air to provide heat/cold requirements for indoor rooms, and on the other hand, the water or antifreeze solution 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, and when the water or antifreeze solution flows through the first medium channel 101 of the third indoor heat exchanger 8, the air exchanges heat with the first medium channel 101 of the third indoor heat exchanger 8 through the fourth air channel 106 under the action of the third indoor fan, so as to provide heat/cold air for corresponding areas.

Alternatively, in the case of the two-pipe heat recovery type air conditioning system having the plurality of first indoor heat exchangers 3, the first medium passages 101 of the plurality of first indoor heat exchangers 3 are connected in parallel and communicate with the first circulation circuit 200.

Alternatively, in the case of having a plurality of second indoor heat exchangers 4, the second medium passages 102 of the plurality of second indoor heat exchangers 4 are connected in parallel and communicate with the second circulation circuit 300. The inflow side of the second medium passage 102 of each second indoor heat exchanger 4 is provided with a first regulating valve 7, so that the heat supply or cold supply of the corresponding second indoor heat exchanger 4 is regulated by controlling the opening degree of each first regulating valve 7 or the air quantity of the second indoor fan. Therefore, the two-pipe heat recovery type air conditioning system can effectively regulate the cooling capacity or the heating capacity of different areas while meeting the cooling or heating requirements of different areas.

Illustratively, the two-tube heat recovery type 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 located in the first and second areas, respectively, and the two second indoor heat exchangers 4 are located in the third and fourth areas, respectively. When the first area and the second area have the cooling requirement, the third area has the low-speed heating requirement, and the fourth area has the rapid heating requirement, the two-pipe heat recovery type air conditioning system operates in the first partition cooling/heating mode. At this time, the two first indoor heat exchangers 3 supply cool air to the corresponding first and second areas, and the two second indoor heat exchangers 4 supply warm air to the corresponding third and fourth areas. The opening degree of the first regulating valve 7 corresponding to the second indoor heat exchanger 4 in the third region is adjusted to 1/4, and the opening degree of the first regulating valve 7 corresponding to the second indoor heat exchanger 4 in the fourth region is adjusted to be fully opened. Thus, the flow of the water or the refrigerating fluid in the second medium channel 102 of the second indoor heat exchanger 4 in the third area is smaller, and the low-speed heating requirement of the third area is met; the flow of the water or the refrigerating fluid in the second medium channel 102 of the second indoor heat exchanger 4 in the region four is larger, so that the rapid heating requirement of the region three is met.

Still another exemplary, two-tube heat recovery type 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 located in zone one and zone two, respectively, and the two second indoor heat exchangers 4 are located in zone three and zone four, respectively. When the first area and the second area have heating requirements, the third area has low-speed cooling requirements, and the fourth area has rapid cooling requirements, the two-pipe heat recovery type air conditioning system operates in a second partition cooling/heating mode. At this time, the two first indoor heat exchangers 3 supply warm air to the corresponding first and second areas, respectively, and the two second indoor heat exchangers 4 supply cool air to the corresponding third and fourth areas, respectively. And the power of the first fan corresponding to the second indoor heat exchanger 4 in the third area is adjusted to 1/4, and the power of the first fan corresponding to the second indoor heat exchanger 4 in the fourth area is adjusted to be the maximum. The third air channel 105 of the second indoor heat exchanger 4 in the third area has smaller air quantity, so that the low-speed cooling requirement of the third area is met; the third air channel 105 of the second indoor heat exchanger 4 in the region four has larger air quantity, and meets the rapid cooling requirement of the region three.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may include structural and other modifications. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the 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 (10)

1. A two-tube heat recovery type air conditioning system, comprising:

an air conditioning unit comprising an outdoor heat exchanger (5), at least one first indoor heat exchanger (3), 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; the first indoor heat exchanger (3) is a double-medium heat exchanger, and the second indoor heat exchanger (4) and the outdoor heat exchanger (5) are three-medium heat exchangers;

a first circulation circuit (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 communicated with the first circulation circuit (200); 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 parallel connection, 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 series connection;

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 are communicated with the second circulation loop (300); the second circulation circuit (300) is provided with a first regulating valve (7), and the first regulating valve (7) is used for regulating the flow rate of the second circulation circuit (300);

a circulating water pump (6) provided in the second circulation circuit (300);

the system comprises a first indoor heat exchanger (3), a second indoor heat exchanger (4), a circulating water pump (6), a first throttling device (30) and a second throttling device (40), wherein the first throttling device (30) is arranged on one side of a first medium channel (101) of the first indoor heat exchanger, and the second throttling device (40) is arranged on one side of the first medium channel (101) of the second indoor heat exchanger, so that multiple functional modes are realized by controlling states of the circulating water pump (6), the first throttling device (30) and the second throttling device (40).

2. The two-pipe heat recovery type air conditioning system according to claim 1, wherein,

the third medium channel of the outdoor heat exchanger (5) is a first air channel (103), and air flows through the first air channel (103) through 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);

the other medium channel of the first indoor heat exchanger (3) is a second air channel (104), and air flows 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 a third air channel (105), and air flows 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).

3. The two-pipe heat recovery air conditioning system according to claim 1 or 2, wherein the air conditioning unit further comprises:

a third indoor heat exchanger (8) that is a dual medium heat exchanger; the first medium channel (101) of the third indoor heat exchanger (8) is communicated with the second circulation loop (300) and is in parallel connection with the second medium channel (102) of the second indoor heat exchanger (4);

the other medium channel of the third indoor heat exchanger (8) is a fourth air channel (106), a third indoor fan is arranged on one side of the third indoor heat exchanger (8), and indoor air exchanges heat with the first medium channel (101) of the third indoor heat exchanger (8) through the fourth air channel (106) to form hot air or cold air;

the inflow side of the first medium channel (101) of the third indoor heat exchanger (8) is provided with a second regulating valve (9).

4. The two-pipe heat recovery type air conditioning system according to claim 1 or 2, wherein the second circulation circuit (300) is further provided with:

a safety valve for conducting to release pressure when the pressure of the second circulation loop (300) is greater than a set pressure value; and/or the number of the groups of groups,

a filter for filtering out impurities from the circulating medium flowing through the second circulation circuit (300); and/or the number of the groups of groups,

an expansion tank for providing a volume-variable space for volume changes generated by the change of the cold and hot temperatures of the circulating medium in the second circulation loop (300); and/or the number of the groups of groups,

and the buffer tank is used for storing part of the circulating medium of the second circulating loop (300) and providing a volume-variable space for volume change caused by cold and hot temperature change of the circulating medium.

5. The two-pipe heat recovery type air conditioning system according to claim 1 or 2, wherein,

the circulating medium in the first circulating loop (200) comprises a refrigerant; and/or the number of the groups of groups,

the circulating medium in the second circulation loop (300) comprises water or antifreeze.

6. The two-pipe heat recovery type air conditioning system according to claim 1 or 2, wherein,

the air conditioning system has a full-area heating mode corresponding to the first circulation circuit (200) running a heating cycle, both the first throttle device (30) and the second throttle device (40) being open, the circulating water pump (6) being closed.

7. The two-pipe heat recovery type air conditioning system according to claim 1 or 2, wherein,

the air conditioning system has a full-area cooling mode corresponding to the first circulation loop (200) running a refrigeration cycle, the first throttling device (30) and the second throttling device (40) being both open, the circulating water pump (6) being closed.

8. The two-pipe heat recovery type air conditioning system according to claim 1 or 2, wherein,

the air conditioning system has a first zone cooling/heating mode corresponding to the first circulation loop (200) running a refrigeration cycle, the first throttling device (30) being turned on, the second throttling device (40) being turned off, and the circulating water pump (6) being turned on, thereby cooling by the first indoor heat exchanger (3) and heating by the second indoor heat exchanger (4).

9. The two-pipe heat recovery type air conditioning system according to claim 1 or 2, wherein,

the air conditioning system has a second zone cooling/heating mode corresponding to the first circulation loop (200) running a heating cycle, the first throttling device (30) is opened, the second throttling device (40) is closed, and the circulating water pump (6) is opened so as to supply heat through the first indoor heat exchanger (3) and cool through the second indoor heat exchanger (4).

10. The two-pipe heat recovery type air conditioning system according to claim 1 or 2, wherein,

the circulating medium in the first circulating loop (200) comprises a refrigerant; and/or the number of the groups of groups,

the circulating medium in the second circulation loop (300) comprises water or antifreeze.